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Commit | Line | Data |
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ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
4a94e368 | 4 | Copyright (C) 1986-2022 Free Software Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 11 | (at your option) any later version. |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | #include "defs.h" | |
bab37966 | 22 | #include "displaced-stepping.h" |
45741a9c | 23 | #include "infrun.h" |
c906108c SS |
24 | #include <ctype.h> |
25 | #include "symtab.h" | |
26 | #include "frame.h" | |
27 | #include "inferior.h" | |
28 | #include "breakpoint.h" | |
c906108c SS |
29 | #include "gdbcore.h" |
30 | #include "gdbcmd.h" | |
31 | #include "target.h" | |
2f4fcf00 | 32 | #include "target-connection.h" |
c906108c SS |
33 | #include "gdbthread.h" |
34 | #include "annotate.h" | |
1adeb98a | 35 | #include "symfile.h" |
7a292a7a | 36 | #include "top.h" |
2acceee2 | 37 | #include "inf-loop.h" |
4e052eda | 38 | #include "regcache.h" |
fd0407d6 | 39 | #include "value.h" |
76727919 | 40 | #include "observable.h" |
f636b87d | 41 | #include "language.h" |
a77053c2 | 42 | #include "solib.h" |
f17517ea | 43 | #include "main.h" |
186c406b | 44 | #include "block.h" |
034dad6f | 45 | #include "mi/mi-common.h" |
4f8d22e3 | 46 | #include "event-top.h" |
96429cc8 | 47 | #include "record.h" |
d02ed0bb | 48 | #include "record-full.h" |
edb3359d | 49 | #include "inline-frame.h" |
4efc6507 | 50 | #include "jit.h" |
06cd862c | 51 | #include "tracepoint.h" |
1bfeeb0f | 52 | #include "skip.h" |
28106bc2 SDJ |
53 | #include "probe.h" |
54 | #include "objfiles.h" | |
de0bea00 | 55 | #include "completer.h" |
9107fc8d | 56 | #include "target-descriptions.h" |
f15cb84a | 57 | #include "target-dcache.h" |
d83ad864 | 58 | #include "terminal.h" |
ff862be4 | 59 | #include "solist.h" |
400b5eca | 60 | #include "gdbsupport/event-loop.h" |
243a9253 | 61 | #include "thread-fsm.h" |
268a13a5 | 62 | #include "gdbsupport/enum-flags.h" |
5ed8105e | 63 | #include "progspace-and-thread.h" |
268a13a5 | 64 | #include "gdbsupport/gdb_optional.h" |
46a62268 | 65 | #include "arch-utils.h" |
268a13a5 TT |
66 | #include "gdbsupport/scope-exit.h" |
67 | #include "gdbsupport/forward-scope-exit.h" | |
06cc9596 | 68 | #include "gdbsupport/gdb_select.h" |
5b6d1e4f | 69 | #include <unordered_map> |
93b54c8e | 70 | #include "async-event.h" |
b161a60d SM |
71 | #include "gdbsupport/selftest.h" |
72 | #include "scoped-mock-context.h" | |
73 | #include "test-target.h" | |
ba988419 | 74 | #include "gdbsupport/common-debug.h" |
7904e961 | 75 | #include "gdbsupport/buildargv.h" |
c906108c SS |
76 | |
77 | /* Prototypes for local functions */ | |
78 | ||
2ea28649 | 79 | static void sig_print_info (enum gdb_signal); |
c906108c | 80 | |
96baa820 | 81 | static void sig_print_header (void); |
c906108c | 82 | |
d83ad864 DB |
83 | static void follow_inferior_reset_breakpoints (void); |
84 | ||
c4464ade | 85 | static bool currently_stepping (struct thread_info *tp); |
a289b8f6 | 86 | |
2c03e5be | 87 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
88 | |
89 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
90 | ||
2484c66b UW |
91 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
92 | ||
22b11ba9 | 93 | static bool maybe_software_singlestep (struct gdbarch *gdbarch); |
8550d3b3 | 94 | |
aff4e175 AB |
95 | static void resume (gdb_signal sig); |
96 | ||
5b6d1e4f PA |
97 | static void wait_for_inferior (inferior *inf); |
98 | ||
d8bbae6e SM |
99 | static void restart_threads (struct thread_info *event_thread, |
100 | inferior *inf = nullptr); | |
101 | ||
102 | static bool start_step_over (void); | |
103 | ||
2b718529 LS |
104 | static bool step_over_info_valid_p (void); |
105 | ||
372316f1 PA |
106 | /* Asynchronous signal handler registered as event loop source for |
107 | when we have pending events ready to be passed to the core. */ | |
108 | static struct async_event_handler *infrun_async_inferior_event_token; | |
109 | ||
110 | /* Stores whether infrun_async was previously enabled or disabled. | |
111 | Starts off as -1, indicating "never enabled/disabled". */ | |
112 | static int infrun_is_async = -1; | |
113 | ||
114 | /* See infrun.h. */ | |
115 | ||
116 | void | |
117 | infrun_async (int enable) | |
118 | { | |
119 | if (infrun_is_async != enable) | |
120 | { | |
121 | infrun_is_async = enable; | |
122 | ||
1eb8556f | 123 | infrun_debug_printf ("enable=%d", enable); |
372316f1 PA |
124 | |
125 | if (enable) | |
126 | mark_async_event_handler (infrun_async_inferior_event_token); | |
127 | else | |
128 | clear_async_event_handler (infrun_async_inferior_event_token); | |
129 | } | |
130 | } | |
131 | ||
0b333c5e PA |
132 | /* See infrun.h. */ |
133 | ||
134 | void | |
135 | mark_infrun_async_event_handler (void) | |
136 | { | |
137 | mark_async_event_handler (infrun_async_inferior_event_token); | |
138 | } | |
139 | ||
5fbbeb29 CF |
140 | /* When set, stop the 'step' command if we enter a function which has |
141 | no line number information. The normal behavior is that we step | |
142 | over such function. */ | |
491144b5 | 143 | bool step_stop_if_no_debug = false; |
920d2a44 AC |
144 | static void |
145 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
146 | struct cmd_list_element *c, const char *value) | |
147 | { | |
6cb06a8c | 148 | gdb_printf (file, _("Mode of the step operation is %s.\n"), value); |
920d2a44 | 149 | } |
5fbbeb29 | 150 | |
b9f437de PA |
151 | /* proceed and normal_stop use this to notify the user when the |
152 | inferior stopped in a different thread than it had been running | |
153 | in. */ | |
96baa820 | 154 | |
39f77062 | 155 | static ptid_t previous_inferior_ptid; |
7a292a7a | 156 | |
07107ca6 LM |
157 | /* If set (default for legacy reasons), when following a fork, GDB |
158 | will detach from one of the fork branches, child or parent. | |
159 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
160 | setting. */ | |
161 | ||
491144b5 | 162 | static bool detach_fork = true; |
6c95b8df | 163 | |
94ba44a6 | 164 | bool debug_infrun = false; |
920d2a44 AC |
165 | static void |
166 | show_debug_infrun (struct ui_file *file, int from_tty, | |
167 | struct cmd_list_element *c, const char *value) | |
168 | { | |
6cb06a8c | 169 | gdb_printf (file, _("Inferior debugging is %s.\n"), value); |
920d2a44 | 170 | } |
527159b7 | 171 | |
03583c20 UW |
172 | /* Support for disabling address space randomization. */ |
173 | ||
491144b5 | 174 | bool disable_randomization = true; |
03583c20 UW |
175 | |
176 | static void | |
177 | show_disable_randomization (struct ui_file *file, int from_tty, | |
178 | struct cmd_list_element *c, const char *value) | |
179 | { | |
180 | if (target_supports_disable_randomization ()) | |
6cb06a8c TT |
181 | gdb_printf (file, |
182 | _("Disabling randomization of debuggee's " | |
183 | "virtual address space is %s.\n"), | |
184 | value); | |
03583c20 | 185 | else |
0426ad51 TT |
186 | gdb_puts (_("Disabling randomization of debuggee's " |
187 | "virtual address space is unsupported on\n" | |
188 | "this platform.\n"), file); | |
03583c20 UW |
189 | } |
190 | ||
191 | static void | |
eb4c3f4a | 192 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
193 | struct cmd_list_element *c) |
194 | { | |
195 | if (!target_supports_disable_randomization ()) | |
196 | error (_("Disabling randomization of debuggee's " | |
197 | "virtual address space is unsupported on\n" | |
198 | "this platform.")); | |
199 | } | |
200 | ||
d32dc48e PA |
201 | /* User interface for non-stop mode. */ |
202 | ||
491144b5 CB |
203 | bool non_stop = false; |
204 | static bool non_stop_1 = false; | |
d32dc48e PA |
205 | |
206 | static void | |
eb4c3f4a | 207 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
208 | struct cmd_list_element *c) |
209 | { | |
55f6301a | 210 | if (target_has_execution ()) |
d32dc48e PA |
211 | { |
212 | non_stop_1 = non_stop; | |
213 | error (_("Cannot change this setting while the inferior is running.")); | |
214 | } | |
215 | ||
216 | non_stop = non_stop_1; | |
217 | } | |
218 | ||
219 | static void | |
220 | show_non_stop (struct ui_file *file, int from_tty, | |
221 | struct cmd_list_element *c, const char *value) | |
222 | { | |
6cb06a8c TT |
223 | gdb_printf (file, |
224 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
225 | value); | |
d32dc48e PA |
226 | } |
227 | ||
d914c394 SS |
228 | /* "Observer mode" is somewhat like a more extreme version of |
229 | non-stop, in which all GDB operations that might affect the | |
230 | target's execution have been disabled. */ | |
231 | ||
6bd434d6 | 232 | static bool observer_mode = false; |
491144b5 | 233 | static bool observer_mode_1 = false; |
d914c394 SS |
234 | |
235 | static void | |
eb4c3f4a | 236 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
237 | struct cmd_list_element *c) |
238 | { | |
55f6301a | 239 | if (target_has_execution ()) |
d914c394 SS |
240 | { |
241 | observer_mode_1 = observer_mode; | |
242 | error (_("Cannot change this setting while the inferior is running.")); | |
243 | } | |
244 | ||
245 | observer_mode = observer_mode_1; | |
246 | ||
247 | may_write_registers = !observer_mode; | |
248 | may_write_memory = !observer_mode; | |
249 | may_insert_breakpoints = !observer_mode; | |
250 | may_insert_tracepoints = !observer_mode; | |
251 | /* We can insert fast tracepoints in or out of observer mode, | |
252 | but enable them if we're going into this mode. */ | |
253 | if (observer_mode) | |
491144b5 | 254 | may_insert_fast_tracepoints = true; |
d914c394 SS |
255 | may_stop = !observer_mode; |
256 | update_target_permissions (); | |
257 | ||
258 | /* Going *into* observer mode we must force non-stop, then | |
259 | going out we leave it that way. */ | |
260 | if (observer_mode) | |
261 | { | |
d914c394 | 262 | pagination_enabled = 0; |
491144b5 | 263 | non_stop = non_stop_1 = true; |
d914c394 SS |
264 | } |
265 | ||
266 | if (from_tty) | |
6cb06a8c TT |
267 | gdb_printf (_("Observer mode is now %s.\n"), |
268 | (observer_mode ? "on" : "off")); | |
d914c394 SS |
269 | } |
270 | ||
271 | static void | |
272 | show_observer_mode (struct ui_file *file, int from_tty, | |
273 | struct cmd_list_element *c, const char *value) | |
274 | { | |
6cb06a8c | 275 | gdb_printf (file, _("Observer mode is %s.\n"), value); |
d914c394 SS |
276 | } |
277 | ||
278 | /* This updates the value of observer mode based on changes in | |
279 | permissions. Note that we are deliberately ignoring the values of | |
280 | may-write-registers and may-write-memory, since the user may have | |
281 | reason to enable these during a session, for instance to turn on a | |
282 | debugging-related global. */ | |
283 | ||
284 | void | |
285 | update_observer_mode (void) | |
286 | { | |
491144b5 CB |
287 | bool newval = (!may_insert_breakpoints |
288 | && !may_insert_tracepoints | |
289 | && may_insert_fast_tracepoints | |
290 | && !may_stop | |
291 | && non_stop); | |
d914c394 SS |
292 | |
293 | /* Let the user know if things change. */ | |
294 | if (newval != observer_mode) | |
6cb06a8c TT |
295 | gdb_printf (_("Observer mode is now %s.\n"), |
296 | (newval ? "on" : "off")); | |
d914c394 SS |
297 | |
298 | observer_mode = observer_mode_1 = newval; | |
299 | } | |
c2c6d25f | 300 | |
c906108c SS |
301 | /* Tables of how to react to signals; the user sets them. */ |
302 | ||
adc6a863 PA |
303 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
304 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
305 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 306 | |
ab04a2af TT |
307 | /* Table of signals that are registered with "catch signal". A |
308 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
309 | signal" command. */ |
310 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 311 | |
2455069d UW |
312 | /* Table of signals that the target may silently handle. |
313 | This is automatically determined from the flags above, | |
314 | and simply cached here. */ | |
adc6a863 | 315 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 316 | |
c906108c SS |
317 | #define SET_SIGS(nsigs,sigs,flags) \ |
318 | do { \ | |
319 | int signum = (nsigs); \ | |
320 | while (signum-- > 0) \ | |
321 | if ((sigs)[signum]) \ | |
322 | (flags)[signum] = 1; \ | |
323 | } while (0) | |
324 | ||
325 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
326 | do { \ | |
327 | int signum = (nsigs); \ | |
328 | while (signum-- > 0) \ | |
329 | if ((sigs)[signum]) \ | |
330 | (flags)[signum] = 0; \ | |
331 | } while (0) | |
332 | ||
9b224c5e PA |
333 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
334 | this function is to avoid exporting `signal_program'. */ | |
335 | ||
336 | void | |
337 | update_signals_program_target (void) | |
338 | { | |
adc6a863 | 339 | target_program_signals (signal_program); |
9b224c5e PA |
340 | } |
341 | ||
1777feb0 | 342 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 343 | |
edb3359d | 344 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
345 | |
346 | /* Command list pointer for the "stop" placeholder. */ | |
347 | ||
348 | static struct cmd_list_element *stop_command; | |
349 | ||
c906108c SS |
350 | /* Nonzero if we want to give control to the user when we're notified |
351 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 352 | int stop_on_solib_events; |
f9e14852 GB |
353 | |
354 | /* Enable or disable optional shared library event breakpoints | |
355 | as appropriate when the above flag is changed. */ | |
356 | ||
357 | static void | |
eb4c3f4a TT |
358 | set_stop_on_solib_events (const char *args, |
359 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
360 | { |
361 | update_solib_breakpoints (); | |
362 | } | |
363 | ||
920d2a44 AC |
364 | static void |
365 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
366 | struct cmd_list_element *c, const char *value) | |
367 | { | |
6cb06a8c TT |
368 | gdb_printf (file, _("Stopping for shared library events is %s.\n"), |
369 | value); | |
920d2a44 | 370 | } |
c906108c | 371 | |
c4464ade | 372 | /* True after stop if current stack frame should be printed. */ |
c906108c | 373 | |
c4464ade | 374 | static bool stop_print_frame; |
c906108c | 375 | |
5b6d1e4f | 376 | /* This is a cached copy of the target/ptid/waitstatus of the last |
fb85cece | 377 | event returned by target_wait(). |
5b6d1e4f PA |
378 | This information is returned by get_last_target_status(). */ |
379 | static process_stratum_target *target_last_proc_target; | |
39f77062 | 380 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
381 | static struct target_waitstatus target_last_waitstatus; |
382 | ||
4e1c45ea | 383 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 384 | |
53904c9e AC |
385 | static const char follow_fork_mode_child[] = "child"; |
386 | static const char follow_fork_mode_parent[] = "parent"; | |
387 | ||
40478521 | 388 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
389 | follow_fork_mode_child, |
390 | follow_fork_mode_parent, | |
391 | NULL | |
ef346e04 | 392 | }; |
c906108c | 393 | |
53904c9e | 394 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
395 | static void |
396 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
397 | struct cmd_list_element *c, const char *value) | |
398 | { | |
6cb06a8c TT |
399 | gdb_printf (file, |
400 | _("Debugger response to a program " | |
401 | "call of fork or vfork is \"%s\".\n"), | |
402 | value); | |
920d2a44 | 403 | } |
c906108c SS |
404 | \f |
405 | ||
d83ad864 DB |
406 | /* Handle changes to the inferior list based on the type of fork, |
407 | which process is being followed, and whether the other process | |
408 | should be detached. On entry inferior_ptid must be the ptid of | |
409 | the fork parent. At return inferior_ptid is the ptid of the | |
410 | followed inferior. */ | |
411 | ||
5ab2fbf1 SM |
412 | static bool |
413 | follow_fork_inferior (bool follow_child, bool detach_fork) | |
d83ad864 | 414 | { |
183be222 | 415 | target_waitkind fork_kind = inferior_thread ()->pending_follow.kind (); |
3a849a34 SM |
416 | gdb_assert (fork_kind == TARGET_WAITKIND_FORKED |
417 | || fork_kind == TARGET_WAITKIND_VFORKED); | |
418 | bool has_vforked = fork_kind == TARGET_WAITKIND_VFORKED; | |
419 | ptid_t parent_ptid = inferior_ptid; | |
183be222 | 420 | ptid_t child_ptid = inferior_thread ()->pending_follow.child_ptid (); |
d83ad864 DB |
421 | |
422 | if (has_vforked | |
423 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 424 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
425 | && !(follow_child || detach_fork || sched_multi)) |
426 | { | |
427 | /* The parent stays blocked inside the vfork syscall until the | |
428 | child execs or exits. If we don't let the child run, then | |
429 | the parent stays blocked. If we're telling the parent to run | |
430 | in the foreground, the user will not be able to ctrl-c to get | |
431 | back the terminal, effectively hanging the debug session. */ | |
6cb06a8c | 432 | gdb_printf (gdb_stderr, _("\ |
d83ad864 DB |
433 | Can not resume the parent process over vfork in the foreground while\n\ |
434 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
435 | \"set schedule-multiple\".\n")); | |
e97007b6 | 436 | return true; |
d83ad864 DB |
437 | } |
438 | ||
82d1f134 SM |
439 | inferior *parent_inf = current_inferior (); |
440 | inferior *child_inf = nullptr; | |
ff770835 | 441 | |
d8bbae6e SM |
442 | gdb_assert (parent_inf->thread_waiting_for_vfork_done == nullptr); |
443 | ||
d83ad864 DB |
444 | if (!follow_child) |
445 | { | |
446 | /* Detach new forked process? */ | |
447 | if (detach_fork) | |
448 | { | |
d83ad864 DB |
449 | /* Before detaching from the child, remove all breakpoints |
450 | from it. If we forked, then this has already been taken | |
451 | care of by infrun.c. If we vforked however, any | |
452 | breakpoint inserted in the parent is visible in the | |
453 | child, even those added while stopped in a vfork | |
454 | catchpoint. This will remove the breakpoints from the | |
455 | parent also, but they'll be reinserted below. */ | |
456 | if (has_vforked) | |
457 | { | |
458 | /* Keep breakpoints list in sync. */ | |
00431a78 | 459 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
460 | } |
461 | ||
f67c0c91 | 462 | if (print_inferior_events) |
d83ad864 | 463 | { |
8dd06f7a | 464 | /* Ensure that we have a process ptid. */ |
e99b03dc | 465 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 466 | |
223ffa71 | 467 | target_terminal::ours_for_output (); |
6cb06a8c TT |
468 | gdb_printf (_("[Detaching after %s from child %s]\n"), |
469 | has_vforked ? "vfork" : "fork", | |
470 | target_pid_to_str (process_ptid).c_str ()); | |
d83ad864 DB |
471 | } |
472 | } | |
473 | else | |
474 | { | |
d83ad864 | 475 | /* Add process to GDB's tables. */ |
e99b03dc | 476 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 | 477 | |
d83ad864 DB |
478 | child_inf->attach_flag = parent_inf->attach_flag; |
479 | copy_terminal_info (child_inf, parent_inf); | |
480 | child_inf->gdbarch = parent_inf->gdbarch; | |
481 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
482 | ||
d83ad864 DB |
483 | child_inf->symfile_flags = SYMFILE_NO_READ; |
484 | ||
485 | /* If this is a vfork child, then the address-space is | |
486 | shared with the parent. */ | |
487 | if (has_vforked) | |
488 | { | |
489 | child_inf->pspace = parent_inf->pspace; | |
490 | child_inf->aspace = parent_inf->aspace; | |
491 | ||
82d1f134 | 492 | exec_on_vfork (child_inf); |
5b6d1e4f | 493 | |
d83ad864 DB |
494 | /* The parent will be frozen until the child is done |
495 | with the shared region. Keep track of the | |
496 | parent. */ | |
497 | child_inf->vfork_parent = parent_inf; | |
498 | child_inf->pending_detach = 0; | |
499 | parent_inf->vfork_child = child_inf; | |
500 | parent_inf->pending_detach = 0; | |
501 | } | |
502 | else | |
503 | { | |
504 | child_inf->aspace = new_address_space (); | |
564b1e3f | 505 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 | 506 | child_inf->removable = 1; |
d83ad864 | 507 | clone_program_space (child_inf->pspace, parent_inf->pspace); |
d83ad864 | 508 | } |
d83ad864 DB |
509 | } |
510 | ||
511 | if (has_vforked) | |
512 | { | |
d83ad864 DB |
513 | /* If we detached from the child, then we have to be careful |
514 | to not insert breakpoints in the parent until the child | |
515 | is done with the shared memory region. However, if we're | |
516 | staying attached to the child, then we can and should | |
517 | insert breakpoints, so that we can debug it. A | |
518 | subsequent child exec or exit is enough to know when does | |
519 | the child stops using the parent's address space. */ | |
6f5d514f SM |
520 | parent_inf->thread_waiting_for_vfork_done |
521 | = detach_fork ? inferior_thread () : nullptr; | |
d83ad864 DB |
522 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; |
523 | } | |
524 | } | |
525 | else | |
526 | { | |
527 | /* Follow the child. */ | |
d83ad864 | 528 | |
f67c0c91 | 529 | if (print_inferior_events) |
d83ad864 | 530 | { |
f67c0c91 SDJ |
531 | std::string parent_pid = target_pid_to_str (parent_ptid); |
532 | std::string child_pid = target_pid_to_str (child_ptid); | |
533 | ||
223ffa71 | 534 | target_terminal::ours_for_output (); |
6cb06a8c TT |
535 | gdb_printf (_("[Attaching after %s %s to child %s]\n"), |
536 | parent_pid.c_str (), | |
537 | has_vforked ? "vfork" : "fork", | |
538 | child_pid.c_str ()); | |
d83ad864 DB |
539 | } |
540 | ||
541 | /* Add the new inferior first, so that the target_detach below | |
542 | doesn't unpush the target. */ | |
543 | ||
e99b03dc | 544 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 | 545 | |
d83ad864 DB |
546 | child_inf->attach_flag = parent_inf->attach_flag; |
547 | copy_terminal_info (child_inf, parent_inf); | |
548 | child_inf->gdbarch = parent_inf->gdbarch; | |
549 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
550 | ||
da474da1 | 551 | if (has_vforked) |
d83ad864 | 552 | { |
da474da1 SM |
553 | /* If this is a vfork child, then the address-space is shared |
554 | with the parent. */ | |
555 | child_inf->aspace = parent_inf->aspace; | |
556 | child_inf->pspace = parent_inf->pspace; | |
5b6d1e4f | 557 | |
82d1f134 | 558 | exec_on_vfork (child_inf); |
d83ad864 | 559 | } |
da474da1 SM |
560 | else if (detach_fork) |
561 | { | |
562 | /* We follow the child and detach from the parent: move the parent's | |
563 | program space to the child. This simplifies some things, like | |
564 | doing "next" over fork() and landing on the expected line in the | |
565 | child (note, that is broken with "set detach-on-fork off"). | |
566 | ||
567 | Before assigning brand new spaces for the parent, remove | |
568 | breakpoints from it: because the new pspace won't match | |
569 | currently inserted locations, the normal detach procedure | |
570 | wouldn't remove them, and we would leave them inserted when | |
571 | detaching. */ | |
572 | remove_breakpoints_inf (parent_inf); | |
573 | ||
574 | child_inf->aspace = parent_inf->aspace; | |
575 | child_inf->pspace = parent_inf->pspace; | |
576 | parent_inf->aspace = new_address_space (); | |
577 | parent_inf->pspace = new program_space (parent_inf->aspace); | |
578 | clone_program_space (parent_inf->pspace, child_inf->pspace); | |
579 | ||
580 | /* The parent inferior is still the current one, so keep things | |
581 | in sync. */ | |
582 | set_current_program_space (parent_inf->pspace); | |
583 | } | |
d83ad864 DB |
584 | else |
585 | { | |
586 | child_inf->aspace = new_address_space (); | |
564b1e3f | 587 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
588 | child_inf->removable = 1; |
589 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
da474da1 | 590 | clone_program_space (child_inf->pspace, parent_inf->pspace); |
d83ad864 DB |
591 | } |
592 | } | |
593 | ||
82d1f134 SM |
594 | gdb_assert (current_inferior () == parent_inf); |
595 | ||
596 | /* If we are setting up an inferior for the child, target_follow_fork is | |
597 | responsible for pushing the appropriate targets on the new inferior's | |
598 | target stack and adding the initial thread (with ptid CHILD_PTID). | |
599 | ||
600 | If we are not setting up an inferior for the child (because following | |
601 | the parent and detach_fork is true), it is responsible for detaching | |
602 | from CHILD_PTID. */ | |
603 | target_follow_fork (child_inf, child_ptid, fork_kind, follow_child, | |
604 | detach_fork); | |
605 | ||
606 | /* target_follow_fork must leave the parent as the current inferior. If we | |
607 | want to follow the child, we make it the current one below. */ | |
608 | gdb_assert (current_inferior () == parent_inf); | |
609 | ||
610 | /* If there is a child inferior, target_follow_fork must have created a thread | |
611 | for it. */ | |
612 | if (child_inf != nullptr) | |
613 | gdb_assert (!child_inf->thread_list.empty ()); | |
614 | ||
577d2167 SM |
615 | /* Clear the parent thread's pending follow field. Do this before calling |
616 | target_detach, so that the target can differentiate the two following | |
617 | cases: | |
618 | ||
619 | - We continue past a fork with "follow-fork-mode == child" && | |
620 | "detach-on-fork on", and therefore detach the parent. In that | |
621 | case the target should not detach the fork child. | |
622 | - We run to a fork catchpoint and the user types "detach". In that | |
623 | case, the target should detach the fork child in addition to the | |
624 | parent. | |
625 | ||
626 | The former case will have pending_follow cleared, the later will have | |
627 | pending_follow set. */ | |
628 | thread_info *parent_thread = find_thread_ptid (parent_inf, parent_ptid); | |
629 | gdb_assert (parent_thread != nullptr); | |
630 | parent_thread->pending_follow.set_spurious (); | |
631 | ||
82d1f134 SM |
632 | /* Detach the parent if needed. */ |
633 | if (follow_child) | |
634 | { | |
635 | /* If we're vforking, we want to hold on to the parent until | |
636 | the child exits or execs. At child exec or exit time we | |
637 | can remove the old breakpoints from the parent and detach | |
638 | or resume debugging it. Otherwise, detach the parent now; | |
639 | we'll want to reuse it's program/address spaces, but we | |
640 | can't set them to the child before removing breakpoints | |
641 | from the parent, otherwise, the breakpoints module could | |
642 | decide to remove breakpoints from the wrong process (since | |
643 | they'd be assigned to the same address space). */ | |
644 | ||
645 | if (has_vforked) | |
646 | { | |
647 | gdb_assert (child_inf->vfork_parent == NULL); | |
648 | gdb_assert (parent_inf->vfork_child == NULL); | |
649 | child_inf->vfork_parent = parent_inf; | |
650 | child_inf->pending_detach = 0; | |
651 | parent_inf->vfork_child = child_inf; | |
652 | parent_inf->pending_detach = detach_fork; | |
82d1f134 SM |
653 | } |
654 | else if (detach_fork) | |
655 | { | |
656 | if (print_inferior_events) | |
657 | { | |
658 | /* Ensure that we have a process ptid. */ | |
659 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
660 | ||
661 | target_terminal::ours_for_output (); | |
6cb06a8c TT |
662 | gdb_printf (_("[Detaching after fork from " |
663 | "parent %s]\n"), | |
664 | target_pid_to_str (process_ptid).c_str ()); | |
82d1f134 SM |
665 | } |
666 | ||
667 | target_detach (parent_inf, 0); | |
668 | } | |
669 | } | |
e97007b6 | 670 | |
ff770835 SM |
671 | /* If we ended up creating a new inferior, call post_create_inferior to inform |
672 | the various subcomponents. */ | |
82d1f134 | 673 | if (child_inf != nullptr) |
ff770835 | 674 | { |
82d1f134 SM |
675 | /* If FOLLOW_CHILD, we leave CHILD_INF as the current inferior |
676 | (do not restore the parent as the current inferior). */ | |
677 | gdb::optional<scoped_restore_current_thread> maybe_restore; | |
678 | ||
679 | if (!follow_child) | |
680 | maybe_restore.emplace (); | |
ff770835 | 681 | |
82d1f134 | 682 | switch_to_thread (*child_inf->threads ().begin ()); |
ff770835 SM |
683 | post_create_inferior (0); |
684 | } | |
685 | ||
e97007b6 | 686 | return false; |
d83ad864 DB |
687 | } |
688 | ||
e58b0e63 PA |
689 | /* Tell the target to follow the fork we're stopped at. Returns true |
690 | if the inferior should be resumed; false, if the target for some | |
691 | reason decided it's best not to resume. */ | |
692 | ||
5ab2fbf1 SM |
693 | static bool |
694 | follow_fork () | |
c906108c | 695 | { |
5ab2fbf1 SM |
696 | bool follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
697 | bool should_resume = true; | |
e58b0e63 PA |
698 | |
699 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
700 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
701 | parent thread structure's run control related fields, not just these. |
702 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
703 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 704 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
705 | CORE_ADDR step_range_start = 0; |
706 | CORE_ADDR step_range_end = 0; | |
bf4cb9be TV |
707 | int current_line = 0; |
708 | symtab *current_symtab = NULL; | |
4e3990f4 | 709 | struct frame_id step_frame_id = { 0 }; |
e58b0e63 PA |
710 | |
711 | if (!non_stop) | |
712 | { | |
5b6d1e4f | 713 | process_stratum_target *wait_target; |
e58b0e63 PA |
714 | ptid_t wait_ptid; |
715 | struct target_waitstatus wait_status; | |
716 | ||
717 | /* Get the last target status returned by target_wait(). */ | |
5b6d1e4f | 718 | get_last_target_status (&wait_target, &wait_ptid, &wait_status); |
e58b0e63 PA |
719 | |
720 | /* If not stopped at a fork event, then there's nothing else to | |
721 | do. */ | |
183be222 SM |
722 | if (wait_status.kind () != TARGET_WAITKIND_FORKED |
723 | && wait_status.kind () != TARGET_WAITKIND_VFORKED) | |
e58b0e63 PA |
724 | return 1; |
725 | ||
726 | /* Check if we switched over from WAIT_PTID, since the event was | |
727 | reported. */ | |
00431a78 | 728 | if (wait_ptid != minus_one_ptid |
5b6d1e4f PA |
729 | && (current_inferior ()->process_target () != wait_target |
730 | || inferior_ptid != wait_ptid)) | |
e58b0e63 PA |
731 | { |
732 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
733 | target to follow it (in either direction). We'll | |
734 | afterwards refuse to resume, and inform the user what | |
735 | happened. */ | |
5b6d1e4f | 736 | thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid); |
00431a78 | 737 | switch_to_thread (wait_thread); |
5ab2fbf1 | 738 | should_resume = false; |
e58b0e63 PA |
739 | } |
740 | } | |
741 | ||
577d2167 | 742 | thread_info *tp = inferior_thread (); |
e58b0e63 PA |
743 | |
744 | /* If there were any forks/vforks that were caught and are now to be | |
745 | followed, then do so now. */ | |
183be222 | 746 | switch (tp->pending_follow.kind ()) |
e58b0e63 PA |
747 | { |
748 | case TARGET_WAITKIND_FORKED: | |
749 | case TARGET_WAITKIND_VFORKED: | |
750 | { | |
751 | ptid_t parent, child; | |
573269a8 | 752 | std::unique_ptr<struct thread_fsm> thread_fsm; |
e58b0e63 PA |
753 | |
754 | /* If the user did a next/step, etc, over a fork call, | |
755 | preserve the stepping state in the fork child. */ | |
756 | if (follow_child && should_resume) | |
757 | { | |
8358c15c JK |
758 | step_resume_breakpoint = clone_momentary_breakpoint |
759 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
760 | step_range_start = tp->control.step_range_start; |
761 | step_range_end = tp->control.step_range_end; | |
bf4cb9be TV |
762 | current_line = tp->current_line; |
763 | current_symtab = tp->current_symtab; | |
16c381f0 | 764 | step_frame_id = tp->control.step_frame_id; |
186c406b TT |
765 | exception_resume_breakpoint |
766 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
573269a8 | 767 | thread_fsm = tp->release_thread_fsm (); |
e58b0e63 PA |
768 | |
769 | /* For now, delete the parent's sr breakpoint, otherwise, | |
770 | parent/child sr breakpoints are considered duplicates, | |
771 | and the child version will not be installed. Remove | |
772 | this when the breakpoints module becomes aware of | |
773 | inferiors and address spaces. */ | |
774 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
775 | tp->control.step_range_start = 0; |
776 | tp->control.step_range_end = 0; | |
777 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 778 | delete_exception_resume_breakpoint (tp); |
e58b0e63 PA |
779 | } |
780 | ||
781 | parent = inferior_ptid; | |
183be222 | 782 | child = tp->pending_follow.child_ptid (); |
e58b0e63 | 783 | |
d8bbae6e SM |
784 | /* If handling a vfork, stop all the inferior's threads, they will be |
785 | restarted when the vfork shared region is complete. */ | |
786 | if (tp->pending_follow.kind () == TARGET_WAITKIND_VFORKED | |
787 | && target_is_non_stop_p ()) | |
788 | stop_all_threads ("handling vfork", tp->inf); | |
789 | ||
5b6d1e4f | 790 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
791 | /* Set up inferior(s) as specified by the caller, and tell the |
792 | target to do whatever is necessary to follow either parent | |
793 | or child. */ | |
794 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
795 | { |
796 | /* Target refused to follow, or there's some other reason | |
797 | we shouldn't resume. */ | |
798 | should_resume = 0; | |
799 | } | |
800 | else | |
801 | { | |
e58b0e63 PA |
802 | /* This makes sure we don't try to apply the "Switched |
803 | over from WAIT_PID" logic above. */ | |
804 | nullify_last_target_wait_ptid (); | |
805 | ||
1777feb0 | 806 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
807 | if (follow_child) |
808 | { | |
5b6d1e4f | 809 | thread_info *child_thr = find_thread_ptid (parent_targ, child); |
00431a78 | 810 | switch_to_thread (child_thr); |
e58b0e63 PA |
811 | |
812 | /* ... and preserve the stepping state, in case the | |
813 | user was stepping over the fork call. */ | |
814 | if (should_resume) | |
815 | { | |
816 | tp = inferior_thread (); | |
8358c15c JK |
817 | tp->control.step_resume_breakpoint |
818 | = step_resume_breakpoint; | |
16c381f0 JK |
819 | tp->control.step_range_start = step_range_start; |
820 | tp->control.step_range_end = step_range_end; | |
bf4cb9be TV |
821 | tp->current_line = current_line; |
822 | tp->current_symtab = current_symtab; | |
16c381f0 | 823 | tp->control.step_frame_id = step_frame_id; |
186c406b TT |
824 | tp->control.exception_resume_breakpoint |
825 | = exception_resume_breakpoint; | |
573269a8 | 826 | tp->set_thread_fsm (std::move (thread_fsm)); |
e58b0e63 PA |
827 | } |
828 | else | |
829 | { | |
830 | /* If we get here, it was because we're trying to | |
831 | resume from a fork catchpoint, but, the user | |
832 | has switched threads away from the thread that | |
833 | forked. In that case, the resume command | |
834 | issued is most likely not applicable to the | |
835 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 836 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 837 | "before following fork child.")); |
e58b0e63 PA |
838 | } |
839 | ||
840 | /* Reset breakpoints in the child as appropriate. */ | |
841 | follow_inferior_reset_breakpoints (); | |
842 | } | |
e58b0e63 PA |
843 | } |
844 | } | |
845 | break; | |
846 | case TARGET_WAITKIND_SPURIOUS: | |
847 | /* Nothing to follow. */ | |
848 | break; | |
849 | default: | |
850 | internal_error (__FILE__, __LINE__, | |
851 | "Unexpected pending_follow.kind %d\n", | |
183be222 | 852 | tp->pending_follow.kind ()); |
e58b0e63 PA |
853 | break; |
854 | } | |
c906108c | 855 | |
e58b0e63 | 856 | return should_resume; |
c906108c SS |
857 | } |
858 | ||
d83ad864 | 859 | static void |
6604731b | 860 | follow_inferior_reset_breakpoints (void) |
c906108c | 861 | { |
4e1c45ea PA |
862 | struct thread_info *tp = inferior_thread (); |
863 | ||
6604731b DJ |
864 | /* Was there a step_resume breakpoint? (There was if the user |
865 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
866 | thread number. Cloned step_resume breakpoints are disabled on |
867 | creation, so enable it here now that it is associated with the | |
868 | correct thread. | |
6604731b DJ |
869 | |
870 | step_resumes are a form of bp that are made to be per-thread. | |
871 | Since we created the step_resume bp when the parent process | |
872 | was being debugged, and now are switching to the child process, | |
873 | from the breakpoint package's viewpoint, that's a switch of | |
874 | "threads". We must update the bp's notion of which thread | |
875 | it is for, or it'll be ignored when it triggers. */ | |
876 | ||
8358c15c | 877 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
878 | { |
879 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
880 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
881 | } | |
6604731b | 882 | |
a1aa2221 | 883 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 884 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
885 | { |
886 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
887 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
888 | } | |
186c406b | 889 | |
6604731b DJ |
890 | /* Reinsert all breakpoints in the child. The user may have set |
891 | breakpoints after catching the fork, in which case those | |
892 | were never set in the child, but only in the parent. This makes | |
893 | sure the inserted breakpoints match the breakpoint list. */ | |
894 | ||
895 | breakpoint_re_set (); | |
896 | insert_breakpoints (); | |
c906108c | 897 | } |
c906108c | 898 | |
69eadcc9 SM |
899 | /* The child has exited or execed: resume THREAD, a thread of the parent, |
900 | if it was meant to be executing. */ | |
6c95b8df | 901 | |
69eadcc9 SM |
902 | static void |
903 | proceed_after_vfork_done (thread_info *thread) | |
6c95b8df | 904 | { |
69eadcc9 | 905 | if (thread->state == THREAD_RUNNING |
611841bb | 906 | && !thread->executing () |
6c95b8df | 907 | && !thread->stop_requested |
1edb66d8 | 908 | && thread->stop_signal () == GDB_SIGNAL_0) |
6c95b8df | 909 | { |
1eb8556f | 910 | infrun_debug_printf ("resuming vfork parent thread %s", |
0fab7955 | 911 | thread->ptid.to_string ().c_str ()); |
6c95b8df | 912 | |
00431a78 | 913 | switch_to_thread (thread); |
70509625 | 914 | clear_proceed_status (0); |
64ce06e4 | 915 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df | 916 | } |
6c95b8df PA |
917 | } |
918 | ||
919 | /* Called whenever we notice an exec or exit event, to handle | |
920 | detaching or resuming a vfork parent. */ | |
921 | ||
922 | static void | |
923 | handle_vfork_child_exec_or_exit (int exec) | |
924 | { | |
925 | struct inferior *inf = current_inferior (); | |
926 | ||
927 | if (inf->vfork_parent) | |
928 | { | |
69eadcc9 | 929 | inferior *resume_parent = nullptr; |
6c95b8df PA |
930 | |
931 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
932 | between the parent and the child. Break the bonds. */ |
933 | inferior *vfork_parent = inf->vfork_parent; | |
934 | inf->vfork_parent->vfork_child = NULL; | |
935 | inf->vfork_parent = NULL; | |
6c95b8df | 936 | |
b73715df TV |
937 | /* If the user wanted to detach from the parent, now is the |
938 | time. */ | |
939 | if (vfork_parent->pending_detach) | |
6c95b8df | 940 | { |
6c95b8df PA |
941 | struct program_space *pspace; |
942 | struct address_space *aspace; | |
943 | ||
1777feb0 | 944 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 945 | |
b73715df | 946 | vfork_parent->pending_detach = 0; |
68c9da30 | 947 | |
18493a00 | 948 | scoped_restore_current_pspace_and_thread restore_thread; |
6c95b8df PA |
949 | |
950 | /* We're letting loose of the parent. */ | |
18493a00 | 951 | thread_info *tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 952 | switch_to_thread (tp); |
6c95b8df PA |
953 | |
954 | /* We're about to detach from the parent, which implicitly | |
955 | removes breakpoints from its address space. There's a | |
956 | catch here: we want to reuse the spaces for the child, | |
957 | but, parent/child are still sharing the pspace at this | |
958 | point, although the exec in reality makes the kernel give | |
959 | the child a fresh set of new pages. The problem here is | |
960 | that the breakpoints module being unaware of this, would | |
961 | likely chose the child process to write to the parent | |
962 | address space. Swapping the child temporarily away from | |
963 | the spaces has the desired effect. Yes, this is "sort | |
964 | of" a hack. */ | |
965 | ||
966 | pspace = inf->pspace; | |
967 | aspace = inf->aspace; | |
968 | inf->aspace = NULL; | |
969 | inf->pspace = NULL; | |
970 | ||
f67c0c91 | 971 | if (print_inferior_events) |
6c95b8df | 972 | { |
a068643d | 973 | std::string pidstr |
b73715df | 974 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 975 | |
223ffa71 | 976 | target_terminal::ours_for_output (); |
6c95b8df PA |
977 | |
978 | if (exec) | |
6f259a23 | 979 | { |
6cb06a8c TT |
980 | gdb_printf (_("[Detaching vfork parent %s " |
981 | "after child exec]\n"), pidstr.c_str ()); | |
6f259a23 | 982 | } |
6c95b8df | 983 | else |
6f259a23 | 984 | { |
6cb06a8c TT |
985 | gdb_printf (_("[Detaching vfork parent %s " |
986 | "after child exit]\n"), pidstr.c_str ()); | |
6f259a23 | 987 | } |
6c95b8df PA |
988 | } |
989 | ||
b73715df | 990 | target_detach (vfork_parent, 0); |
6c95b8df PA |
991 | |
992 | /* Put it back. */ | |
993 | inf->pspace = pspace; | |
994 | inf->aspace = aspace; | |
6c95b8df PA |
995 | } |
996 | else if (exec) | |
997 | { | |
998 | /* We're staying attached to the parent, so, really give the | |
999 | child a new address space. */ | |
564b1e3f | 1000 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
1001 | inf->aspace = inf->pspace->aspace; |
1002 | inf->removable = 1; | |
1003 | set_current_program_space (inf->pspace); | |
1004 | ||
69eadcc9 | 1005 | resume_parent = vfork_parent; |
6c95b8df PA |
1006 | } |
1007 | else | |
1008 | { | |
6c95b8df PA |
1009 | /* If this is a vfork child exiting, then the pspace and |
1010 | aspaces were shared with the parent. Since we're | |
1011 | reporting the process exit, we'll be mourning all that is | |
1012 | found in the address space, and switching to null_ptid, | |
1013 | preparing to start a new inferior. But, since we don't | |
1014 | want to clobber the parent's address/program spaces, we | |
1015 | go ahead and create a new one for this exiting | |
1016 | inferior. */ | |
1017 | ||
18493a00 | 1018 | /* Switch to no-thread while running clone_program_space, so |
5ed8105e PA |
1019 | that clone_program_space doesn't want to read the |
1020 | selected frame of a dead process. */ | |
18493a00 PA |
1021 | scoped_restore_current_thread restore_thread; |
1022 | switch_to_no_thread (); | |
6c95b8df | 1023 | |
53af73bf PA |
1024 | inf->pspace = new program_space (maybe_new_address_space ()); |
1025 | inf->aspace = inf->pspace->aspace; | |
1026 | set_current_program_space (inf->pspace); | |
6c95b8df | 1027 | inf->removable = 1; |
7dcd53a0 | 1028 | inf->symfile_flags = SYMFILE_NO_READ; |
53af73bf | 1029 | clone_program_space (inf->pspace, vfork_parent->pspace); |
6c95b8df | 1030 | |
69eadcc9 | 1031 | resume_parent = vfork_parent; |
6c95b8df PA |
1032 | } |
1033 | ||
6c95b8df PA |
1034 | gdb_assert (current_program_space == inf->pspace); |
1035 | ||
69eadcc9 | 1036 | if (non_stop && resume_parent != nullptr) |
6c95b8df PA |
1037 | { |
1038 | /* If the user wanted the parent to be running, let it go | |
1039 | free now. */ | |
5ed8105e | 1040 | scoped_restore_current_thread restore_thread; |
6c95b8df | 1041 | |
1eb8556f | 1042 | infrun_debug_printf ("resuming vfork parent process %d", |
69eadcc9 | 1043 | resume_parent->pid); |
6c95b8df | 1044 | |
69eadcc9 SM |
1045 | for (thread_info *thread : resume_parent->threads ()) |
1046 | proceed_after_vfork_done (thread); | |
6c95b8df PA |
1047 | } |
1048 | } | |
1049 | } | |
1050 | ||
d8bbae6e SM |
1051 | /* Handle TARGET_WAITKIND_VFORK_DONE. */ |
1052 | ||
1053 | static void | |
1054 | handle_vfork_done (thread_info *event_thread) | |
1055 | { | |
1056 | /* We only care about this event if inferior::thread_waiting_for_vfork_done is | |
1057 | set, that is if we are waiting for a vfork child not under our control | |
1058 | (because we detached it) to exec or exit. | |
1059 | ||
1060 | If an inferior has vforked and we are debugging the child, we don't use | |
1061 | the vfork-done event to get notified about the end of the shared address | |
1062 | space window. We rely instead on the child's exec or exit event, and the | |
1063 | inferior::vfork_{parent,child} fields are used instead. See | |
1064 | handle_vfork_child_exec_or_exit for that. */ | |
1065 | if (event_thread->inf->thread_waiting_for_vfork_done == nullptr) | |
1066 | { | |
1067 | infrun_debug_printf ("not waiting for a vfork-done event"); | |
1068 | return; | |
1069 | } | |
1070 | ||
1071 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; | |
1072 | ||
1073 | /* We stopped all threads (other than the vforking thread) of the inferior in | |
1074 | follow_fork and kept them stopped until now. It should therefore not be | |
1075 | possible for another thread to have reported a vfork during that window. | |
1076 | If THREAD_WAITING_FOR_VFORK_DONE is set, it has to be the same thread whose | |
1077 | vfork-done we are handling right now. */ | |
1078 | gdb_assert (event_thread->inf->thread_waiting_for_vfork_done == event_thread); | |
1079 | ||
1080 | event_thread->inf->thread_waiting_for_vfork_done = nullptr; | |
1081 | event_thread->inf->pspace->breakpoints_not_allowed = 0; | |
1082 | ||
1083 | /* On non-stop targets, we stopped all the inferior's threads in follow_fork, | |
1084 | resume them now. On all-stop targets, everything that needs to be resumed | |
1085 | will be when we resume the event thread. */ | |
1086 | if (target_is_non_stop_p ()) | |
1087 | { | |
1088 | /* restart_threads and start_step_over may change the current thread, make | |
1089 | sure we leave the event thread as the current thread. */ | |
1090 | scoped_restore_current_thread restore_thread; | |
1091 | ||
1092 | insert_breakpoints (); | |
d8bbae6e | 1093 | start_step_over (); |
2b718529 LS |
1094 | |
1095 | if (!step_over_info_valid_p ()) | |
1096 | restart_threads (event_thread, event_thread->inf); | |
d8bbae6e SM |
1097 | } |
1098 | } | |
1099 | ||
eb6c553b | 1100 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1101 | |
1102 | static const char follow_exec_mode_new[] = "new"; | |
1103 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1104 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1105 | { |
1106 | follow_exec_mode_new, | |
1107 | follow_exec_mode_same, | |
1108 | NULL, | |
1109 | }; | |
1110 | ||
1111 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1112 | static void | |
1113 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1114 | struct cmd_list_element *c, const char *value) | |
1115 | { | |
6cb06a8c | 1116 | gdb_printf (file, _("Follow exec mode is \"%s\".\n"), value); |
6c95b8df PA |
1117 | } |
1118 | ||
ecf45d2c | 1119 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1120 | |
c906108c | 1121 | static void |
4ca51187 | 1122 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1123 | { |
e99b03dc | 1124 | int pid = ptid.pid (); |
94585166 | 1125 | ptid_t process_ptid; |
7a292a7a | 1126 | |
65d2b333 PW |
1127 | /* Switch terminal for any messages produced e.g. by |
1128 | breakpoint_re_set. */ | |
1129 | target_terminal::ours_for_output (); | |
1130 | ||
c906108c SS |
1131 | /* This is an exec event that we actually wish to pay attention to. |
1132 | Refresh our symbol table to the newly exec'd program, remove any | |
1133 | momentary bp's, etc. | |
1134 | ||
1135 | If there are breakpoints, they aren't really inserted now, | |
1136 | since the exec() transformed our inferior into a fresh set | |
1137 | of instructions. | |
1138 | ||
1139 | We want to preserve symbolic breakpoints on the list, since | |
1140 | we have hopes that they can be reset after the new a.out's | |
1141 | symbol table is read. | |
1142 | ||
1143 | However, any "raw" breakpoints must be removed from the list | |
1144 | (e.g., the solib bp's), since their address is probably invalid | |
1145 | now. | |
1146 | ||
1147 | And, we DON'T want to call delete_breakpoints() here, since | |
1148 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1149 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1150 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1151 | |
1152 | mark_breakpoints_out (); | |
1153 | ||
95e50b27 PA |
1154 | /* The target reports the exec event to the main thread, even if |
1155 | some other thread does the exec, and even if the main thread was | |
1156 | stopped or already gone. We may still have non-leader threads of | |
1157 | the process on our list. E.g., on targets that don't have thread | |
1158 | exit events (like remote); or on native Linux in non-stop mode if | |
1159 | there were only two threads in the inferior and the non-leader | |
1160 | one is the one that execs (and nothing forces an update of the | |
1161 | thread list up to here). When debugging remotely, it's best to | |
1162 | avoid extra traffic, when possible, so avoid syncing the thread | |
1163 | list with the target, and instead go ahead and delete all threads | |
1164 | of the process but one that reported the event. Note this must | |
1165 | be done before calling update_breakpoints_after_exec, as | |
1166 | otherwise clearing the threads' resources would reference stale | |
1167 | thread breakpoints -- it may have been one of these threads that | |
1168 | stepped across the exec. We could just clear their stepping | |
1169 | states, but as long as we're iterating, might as well delete | |
1170 | them. Deleting them now rather than at the next user-visible | |
1171 | stop provides a nicer sequence of events for user and MI | |
1172 | notifications. */ | |
08036331 | 1173 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1174 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1175 | delete_thread (th); |
95e50b27 PA |
1176 | |
1177 | /* We also need to clear any left over stale state for the | |
1178 | leader/event thread. E.g., if there was any step-resume | |
1179 | breakpoint or similar, it's gone now. We cannot truly | |
1180 | step-to-next statement through an exec(). */ | |
08036331 | 1181 | thread_info *th = inferior_thread (); |
8358c15c | 1182 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1183 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1184 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1185 | th->control.step_range_start = 0; |
1186 | th->control.step_range_end = 0; | |
c906108c | 1187 | |
95e50b27 PA |
1188 | /* The user may have had the main thread held stopped in the |
1189 | previous image (e.g., schedlock on, or non-stop). Release | |
1190 | it now. */ | |
a75724bc PA |
1191 | th->stop_requested = 0; |
1192 | ||
95e50b27 PA |
1193 | update_breakpoints_after_exec (); |
1194 | ||
1777feb0 | 1195 | /* What is this a.out's name? */ |
f2907e49 | 1196 | process_ptid = ptid_t (pid); |
6cb06a8c TT |
1197 | gdb_printf (_("%s is executing new program: %s\n"), |
1198 | target_pid_to_str (process_ptid).c_str (), | |
1199 | exec_file_target); | |
c906108c SS |
1200 | |
1201 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1202 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1203 | |
6ca15a4b | 1204 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1205 | |
797bc1cb TT |
1206 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1207 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1208 | |
ecf45d2c SL |
1209 | /* If we were unable to map the executable target pathname onto a host |
1210 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1211 | is confusing. Maybe it would even be better to stop at this point | |
1212 | so that the user can specify a file manually before continuing. */ | |
1213 | if (exec_file_host == NULL) | |
1214 | warning (_("Could not load symbols for executable %s.\n" | |
1215 | "Do you need \"set sysroot\"?"), | |
1216 | exec_file_target); | |
c906108c | 1217 | |
cce9b6bf PA |
1218 | /* Reset the shared library package. This ensures that we get a |
1219 | shlib event when the child reaches "_start", at which point the | |
1220 | dld will have had a chance to initialize the child. */ | |
1221 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1222 | we don't want those to be satisfied by the libraries of the | |
1223 | previous incarnation of this process. */ | |
1224 | no_shared_libraries (NULL, 0); | |
1225 | ||
294c36eb SM |
1226 | struct inferior *inf = current_inferior (); |
1227 | ||
6c95b8df PA |
1228 | if (follow_exec_mode_string == follow_exec_mode_new) |
1229 | { | |
6c95b8df PA |
1230 | /* The user wants to keep the old inferior and program spaces |
1231 | around. Create a new fresh one, and switch to it. */ | |
1232 | ||
35ed81d4 SM |
1233 | /* Do exit processing for the original inferior before setting the new |
1234 | inferior's pid. Having two inferiors with the same pid would confuse | |
1235 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1236 | old to the new inferior. */ | |
294c36eb SM |
1237 | inferior *new_inferior = add_inferior_with_spaces (); |
1238 | ||
1239 | swap_terminal_info (new_inferior, inf); | |
1240 | exit_inferior_silent (inf); | |
1241 | ||
1242 | new_inferior->pid = pid; | |
1243 | target_follow_exec (new_inferior, ptid, exec_file_target); | |
1244 | ||
1245 | /* We continue with the new inferior. */ | |
1246 | inf = new_inferior; | |
6c95b8df | 1247 | } |
9107fc8d PA |
1248 | else |
1249 | { | |
1250 | /* The old description may no longer be fit for the new image. | |
1251 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1252 | old description; we'll read a new one below. No need to do | |
1253 | this on "follow-exec-mode new", as the old inferior stays | |
1254 | around (its description is later cleared/refetched on | |
1255 | restart). */ | |
1256 | target_clear_description (); | |
294c36eb | 1257 | target_follow_exec (inf, ptid, exec_file_target); |
9107fc8d | 1258 | } |
6c95b8df | 1259 | |
294c36eb | 1260 | gdb_assert (current_inferior () == inf); |
6c95b8df PA |
1261 | gdb_assert (current_program_space == inf->pspace); |
1262 | ||
ecf45d2c SL |
1263 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1264 | because the proper displacement for a PIE (Position Independent | |
1265 | Executable) main symbol file will only be computed by | |
1266 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1267 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1268 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1269 | |
9107fc8d PA |
1270 | /* If the target can specify a description, read it. Must do this |
1271 | after flipping to the new executable (because the target supplied | |
1272 | description must be compatible with the executable's | |
1273 | architecture, and the old executable may e.g., be 32-bit, while | |
1274 | the new one 64-bit), and before anything involving memory or | |
1275 | registers. */ | |
1276 | target_find_description (); | |
1277 | ||
42a4fec5 | 1278 | gdb::observers::inferior_execd.notify (inf); |
4efc6507 | 1279 | |
c1e56572 JK |
1280 | breakpoint_re_set (); |
1281 | ||
c906108c SS |
1282 | /* Reinsert all breakpoints. (Those which were symbolic have |
1283 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1284 | to symbol_file_command...). */ |
c906108c SS |
1285 | insert_breakpoints (); |
1286 | ||
1287 | /* The next resume of this inferior should bring it to the shlib | |
1288 | startup breakpoints. (If the user had also set bp's on | |
1289 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1290 | matically get reset there in the new process.). */ |
c906108c SS |
1291 | } |
1292 | ||
28d5518b | 1293 | /* The chain of threads that need to do a step-over operation to get |
c2829269 PA |
1294 | past e.g., a breakpoint. What technique is used to step over the |
1295 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1296 | same queue, to maintain rough temporal order of execution, in order | |
1297 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1298 | constantly stepping the same couple threads past their breakpoints | |
1299 | over and over, if the single-step finish fast enough. */ | |
8b6a69b2 | 1300 | thread_step_over_list global_thread_step_over_list; |
c2829269 | 1301 | |
6c4cfb24 PA |
1302 | /* Bit flags indicating what the thread needs to step over. */ |
1303 | ||
8d297bbf | 1304 | enum step_over_what_flag |
6c4cfb24 PA |
1305 | { |
1306 | /* Step over a breakpoint. */ | |
1307 | STEP_OVER_BREAKPOINT = 1, | |
1308 | ||
1309 | /* Step past a non-continuable watchpoint, in order to let the | |
1310 | instruction execute so we can evaluate the watchpoint | |
1311 | expression. */ | |
1312 | STEP_OVER_WATCHPOINT = 2 | |
1313 | }; | |
8d297bbf | 1314 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1315 | |
963f9c80 | 1316 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1317 | |
1318 | struct step_over_info | |
1319 | { | |
963f9c80 PA |
1320 | /* If we're stepping past a breakpoint, this is the address space |
1321 | and address of the instruction the breakpoint is set at. We'll | |
1322 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1323 | non-NULL. */ | |
ac7d717c PA |
1324 | const address_space *aspace = nullptr; |
1325 | CORE_ADDR address = 0; | |
963f9c80 PA |
1326 | |
1327 | /* The instruction being stepped over triggers a nonsteppable | |
1328 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
ac7d717c | 1329 | int nonsteppable_watchpoint_p = 0; |
21edc42f YQ |
1330 | |
1331 | /* The thread's global number. */ | |
ac7d717c | 1332 | int thread = -1; |
31e77af2 PA |
1333 | }; |
1334 | ||
1335 | /* The step-over info of the location that is being stepped over. | |
1336 | ||
1337 | Note that with async/breakpoint always-inserted mode, a user might | |
1338 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1339 | being stepped over. As setting a new breakpoint inserts all | |
1340 | breakpoints, we need to make sure the breakpoint being stepped over | |
1341 | isn't inserted then. We do that by only clearing the step-over | |
1342 | info when the step-over is actually finished (or aborted). | |
1343 | ||
1344 | Presently GDB can only step over one breakpoint at any given time. | |
1345 | Given threads that can't run code in the same address space as the | |
1346 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1347 | to step-over at most one breakpoint per address space (so this info | |
1348 | could move to the address space object if/when GDB is extended). | |
1349 | The set of breakpoints being stepped over will normally be much | |
1350 | smaller than the set of all breakpoints, so a flag in the | |
1351 | breakpoint location structure would be wasteful. A separate list | |
1352 | also saves complexity and run-time, as otherwise we'd have to go | |
1353 | through all breakpoint locations clearing their flag whenever we | |
1354 | start a new sequence. Similar considerations weigh against storing | |
1355 | this info in the thread object. Plus, not all step overs actually | |
1356 | have breakpoint locations -- e.g., stepping past a single-step | |
1357 | breakpoint, or stepping to complete a non-continuable | |
1358 | watchpoint. */ | |
1359 | static struct step_over_info step_over_info; | |
1360 | ||
1361 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1362 | stepping over. |
1363 | N.B. We record the aspace and address now, instead of say just the thread, | |
1364 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1365 | |
1366 | static void | |
8b86c959 | 1367 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1368 | int nonsteppable_watchpoint_p, |
1369 | int thread) | |
31e77af2 PA |
1370 | { |
1371 | step_over_info.aspace = aspace; | |
1372 | step_over_info.address = address; | |
963f9c80 | 1373 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1374 | step_over_info.thread = thread; |
31e77af2 PA |
1375 | } |
1376 | ||
1377 | /* Called when we're not longer stepping over a breakpoint / an | |
1378 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1379 | ||
1380 | static void | |
1381 | clear_step_over_info (void) | |
1382 | { | |
1eb8556f | 1383 | infrun_debug_printf ("clearing step over info"); |
31e77af2 PA |
1384 | step_over_info.aspace = NULL; |
1385 | step_over_info.address = 0; | |
963f9c80 | 1386 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1387 | step_over_info.thread = -1; |
31e77af2 PA |
1388 | } |
1389 | ||
7f89fd65 | 1390 | /* See infrun.h. */ |
31e77af2 PA |
1391 | |
1392 | int | |
1393 | stepping_past_instruction_at (struct address_space *aspace, | |
1394 | CORE_ADDR address) | |
1395 | { | |
1396 | return (step_over_info.aspace != NULL | |
1397 | && breakpoint_address_match (aspace, address, | |
1398 | step_over_info.aspace, | |
1399 | step_over_info.address)); | |
1400 | } | |
1401 | ||
963f9c80 PA |
1402 | /* See infrun.h. */ |
1403 | ||
21edc42f YQ |
1404 | int |
1405 | thread_is_stepping_over_breakpoint (int thread) | |
1406 | { | |
1407 | return (step_over_info.thread != -1 | |
1408 | && thread == step_over_info.thread); | |
1409 | } | |
1410 | ||
1411 | /* See infrun.h. */ | |
1412 | ||
963f9c80 PA |
1413 | int |
1414 | stepping_past_nonsteppable_watchpoint (void) | |
1415 | { | |
1416 | return step_over_info.nonsteppable_watchpoint_p; | |
1417 | } | |
1418 | ||
6cc83d2a PA |
1419 | /* Returns true if step-over info is valid. */ |
1420 | ||
c4464ade | 1421 | static bool |
6cc83d2a PA |
1422 | step_over_info_valid_p (void) |
1423 | { | |
963f9c80 PA |
1424 | return (step_over_info.aspace != NULL |
1425 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1426 | } |
1427 | ||
c906108c | 1428 | \f |
237fc4c9 PA |
1429 | /* Displaced stepping. */ |
1430 | ||
1431 | /* In non-stop debugging mode, we must take special care to manage | |
1432 | breakpoints properly; in particular, the traditional strategy for | |
1433 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1434 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1435 | breakpoint it has hit while ensuring that other threads running | |
1436 | concurrently will hit the breakpoint as they should. | |
1437 | ||
1438 | The traditional way to step a thread T off a breakpoint in a | |
1439 | multi-threaded program in all-stop mode is as follows: | |
1440 | ||
1441 | a0) Initially, all threads are stopped, and breakpoints are not | |
1442 | inserted. | |
1443 | a1) We single-step T, leaving breakpoints uninserted. | |
1444 | a2) We insert breakpoints, and resume all threads. | |
1445 | ||
1446 | In non-stop debugging, however, this strategy is unsuitable: we | |
1447 | don't want to have to stop all threads in the system in order to | |
1448 | continue or step T past a breakpoint. Instead, we use displaced | |
1449 | stepping: | |
1450 | ||
1451 | n0) Initially, T is stopped, other threads are running, and | |
1452 | breakpoints are inserted. | |
1453 | n1) We copy the instruction "under" the breakpoint to a separate | |
1454 | location, outside the main code stream, making any adjustments | |
1455 | to the instruction, register, and memory state as directed by | |
1456 | T's architecture. | |
1457 | n2) We single-step T over the instruction at its new location. | |
1458 | n3) We adjust the resulting register and memory state as directed | |
1459 | by T's architecture. This includes resetting T's PC to point | |
1460 | back into the main instruction stream. | |
1461 | n4) We resume T. | |
1462 | ||
1463 | This approach depends on the following gdbarch methods: | |
1464 | ||
1465 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1466 | indicate where to copy the instruction, and how much space must | |
1467 | be reserved there. We use these in step n1. | |
1468 | ||
1469 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1470 | address, and makes any necessary adjustments to the instruction, | |
1471 | register contents, and memory. We use this in step n1. | |
1472 | ||
1473 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1474 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1475 | same effect the instruction would have had if we had executed it |
1476 | at its original address. We use this in step n3. | |
1477 | ||
237fc4c9 PA |
1478 | The gdbarch_displaced_step_copy_insn and |
1479 | gdbarch_displaced_step_fixup functions must be written so that | |
1480 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1481 | single-stepping across the copied instruction, and then applying | |
1482 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1483 | thread's memory and registers as stepping the instruction in place | |
1484 | would have. Exactly which responsibilities fall to the copy and | |
1485 | which fall to the fixup is up to the author of those functions. | |
1486 | ||
1487 | See the comments in gdbarch.sh for details. | |
1488 | ||
1489 | Note that displaced stepping and software single-step cannot | |
1490 | currently be used in combination, although with some care I think | |
1491 | they could be made to. Software single-step works by placing | |
1492 | breakpoints on all possible subsequent instructions; if the | |
1493 | displaced instruction is a PC-relative jump, those breakpoints | |
1494 | could fall in very strange places --- on pages that aren't | |
1495 | executable, or at addresses that are not proper instruction | |
1496 | boundaries. (We do generally let other threads run while we wait | |
1497 | to hit the software single-step breakpoint, and they might | |
1498 | encounter such a corrupted instruction.) One way to work around | |
1499 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1500 | simulate the effect of PC-relative instructions (and return NULL) | |
1501 | on architectures that use software single-stepping. | |
1502 | ||
1503 | In non-stop mode, we can have independent and simultaneous step | |
1504 | requests, so more than one thread may need to simultaneously step | |
1505 | over a breakpoint. The current implementation assumes there is | |
1506 | only one scratch space per process. In this case, we have to | |
1507 | serialize access to the scratch space. If thread A wants to step | |
1508 | over a breakpoint, but we are currently waiting for some other | |
1509 | thread to complete a displaced step, we leave thread A stopped and | |
1510 | place it in the displaced_step_request_queue. Whenever a displaced | |
1511 | step finishes, we pick the next thread in the queue and start a new | |
1512 | displaced step operation on it. See displaced_step_prepare and | |
7def77a1 | 1513 | displaced_step_finish for details. */ |
237fc4c9 | 1514 | |
a46d1843 | 1515 | /* Return true if THREAD is doing a displaced step. */ |
c0987663 | 1516 | |
c4464ade | 1517 | static bool |
00431a78 | 1518 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1519 | { |
00431a78 | 1520 | gdb_assert (thread != NULL); |
c0987663 | 1521 | |
187b041e | 1522 | return thread->displaced_step_state.in_progress (); |
c0987663 YQ |
1523 | } |
1524 | ||
a46d1843 | 1525 | /* Return true if INF has a thread doing a displaced step. */ |
8f572e5c | 1526 | |
c4464ade | 1527 | static bool |
00431a78 | 1528 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1529 | { |
187b041e | 1530 | return inf->displaced_step_state.in_progress_count > 0; |
fc1cf338 PA |
1531 | } |
1532 | ||
187b041e | 1533 | /* Return true if any thread is doing a displaced step. */ |
a42244db | 1534 | |
187b041e SM |
1535 | static bool |
1536 | displaced_step_in_progress_any_thread () | |
a42244db | 1537 | { |
187b041e SM |
1538 | for (inferior *inf : all_non_exited_inferiors ()) |
1539 | { | |
1540 | if (displaced_step_in_progress (inf)) | |
1541 | return true; | |
1542 | } | |
a42244db | 1543 | |
187b041e | 1544 | return false; |
a42244db YQ |
1545 | } |
1546 | ||
fc1cf338 PA |
1547 | static void |
1548 | infrun_inferior_exit (struct inferior *inf) | |
1549 | { | |
d20172fc | 1550 | inf->displaced_step_state.reset (); |
6f5d514f | 1551 | inf->thread_waiting_for_vfork_done = nullptr; |
fc1cf338 | 1552 | } |
237fc4c9 | 1553 | |
3b7a962d SM |
1554 | static void |
1555 | infrun_inferior_execd (inferior *inf) | |
1556 | { | |
187b041e SM |
1557 | /* If some threads where was doing a displaced step in this inferior at the |
1558 | moment of the exec, they no longer exist. Even if the exec'ing thread | |
3b7a962d SM |
1559 | doing a displaced step, we don't want to to any fixup nor restore displaced |
1560 | stepping buffer bytes. */ | |
1561 | inf->displaced_step_state.reset (); | |
1562 | ||
187b041e SM |
1563 | for (thread_info *thread : inf->threads ()) |
1564 | thread->displaced_step_state.reset (); | |
1565 | ||
3b7a962d SM |
1566 | /* Since an in-line step is done with everything else stopped, if there was |
1567 | one in progress at the time of the exec, it must have been the exec'ing | |
1568 | thread. */ | |
1569 | clear_step_over_info (); | |
6f5d514f SM |
1570 | |
1571 | inf->thread_waiting_for_vfork_done = nullptr; | |
3b7a962d SM |
1572 | } |
1573 | ||
fff08868 HZ |
1574 | /* If ON, and the architecture supports it, GDB will use displaced |
1575 | stepping to step over breakpoints. If OFF, or if the architecture | |
1576 | doesn't support it, GDB will instead use the traditional | |
1577 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1578 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1579 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1580 | |
72d0e2c5 | 1581 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1582 | |
237fc4c9 PA |
1583 | static void |
1584 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1585 | struct cmd_list_element *c, | |
1586 | const char *value) | |
1587 | { | |
72d0e2c5 | 1588 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
6cb06a8c TT |
1589 | gdb_printf (file, |
1590 | _("Debugger's willingness to use displaced stepping " | |
1591 | "to step over breakpoints is %s (currently %s).\n"), | |
1592 | value, target_is_non_stop_p () ? "on" : "off"); | |
fff08868 | 1593 | else |
6cb06a8c TT |
1594 | gdb_printf (file, |
1595 | _("Debugger's willingness to use displaced stepping " | |
1596 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1597 | } |
1598 | ||
9822cb57 SM |
1599 | /* Return true if the gdbarch implements the required methods to use |
1600 | displaced stepping. */ | |
1601 | ||
1602 | static bool | |
1603 | gdbarch_supports_displaced_stepping (gdbarch *arch) | |
1604 | { | |
187b041e SM |
1605 | /* Only check for the presence of `prepare`. The gdbarch verification ensures |
1606 | that if `prepare` is provided, so is `finish`. */ | |
1607 | return gdbarch_displaced_step_prepare_p (arch); | |
9822cb57 SM |
1608 | } |
1609 | ||
fff08868 | 1610 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1611 | over breakpoints of thread TP. */ |
fff08868 | 1612 | |
9822cb57 SM |
1613 | static bool |
1614 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1615 | { |
9822cb57 SM |
1616 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1617 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1618 | return false; | |
1619 | ||
1620 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1621 | way. */ | |
1622 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1623 | && !target_is_non_stop_p ()) | |
1624 | return false; | |
1625 | ||
1626 | gdbarch *gdbarch = get_thread_regcache (tp)->arch (); | |
1627 | ||
1628 | /* If the architecture doesn't implement displaced stepping, don't use | |
1629 | it. */ | |
1630 | if (!gdbarch_supports_displaced_stepping (gdbarch)) | |
1631 | return false; | |
1632 | ||
1633 | /* If recording, don't use displaced stepping. */ | |
1634 | if (find_record_target () != nullptr) | |
1635 | return false; | |
1636 | ||
9822cb57 SM |
1637 | /* If displaced stepping failed before for this inferior, don't bother trying |
1638 | again. */ | |
f5f01699 | 1639 | if (tp->inf->displaced_step_state.failed_before) |
9822cb57 SM |
1640 | return false; |
1641 | ||
1642 | return true; | |
237fc4c9 PA |
1643 | } |
1644 | ||
187b041e | 1645 | /* Simple function wrapper around displaced_step_thread_state::reset. */ |
d8d83535 | 1646 | |
237fc4c9 | 1647 | static void |
187b041e | 1648 | displaced_step_reset (displaced_step_thread_state *displaced) |
237fc4c9 | 1649 | { |
d8d83535 | 1650 | displaced->reset (); |
237fc4c9 PA |
1651 | } |
1652 | ||
d8d83535 SM |
1653 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1654 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1655 | ||
1656 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 | 1657 | |
136821d9 SM |
1658 | /* See infrun.h. */ |
1659 | ||
1660 | std::string | |
1661 | displaced_step_dump_bytes (const gdb_byte *buf, size_t len) | |
237fc4c9 | 1662 | { |
136821d9 | 1663 | std::string ret; |
237fc4c9 | 1664 | |
136821d9 SM |
1665 | for (size_t i = 0; i < len; i++) |
1666 | { | |
1667 | if (i == 0) | |
1668 | ret += string_printf ("%02x", buf[i]); | |
1669 | else | |
1670 | ret += string_printf (" %02x", buf[i]); | |
1671 | } | |
1672 | ||
1673 | return ret; | |
237fc4c9 PA |
1674 | } |
1675 | ||
1676 | /* Prepare to single-step, using displaced stepping. | |
1677 | ||
1678 | Note that we cannot use displaced stepping when we have a signal to | |
1679 | deliver. If we have a signal to deliver and an instruction to step | |
1680 | over, then after the step, there will be no indication from the | |
1681 | target whether the thread entered a signal handler or ignored the | |
1682 | signal and stepped over the instruction successfully --- both cases | |
1683 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1684 | fixup, and in the second case we must --- but we can't tell which. | |
1685 | Comments in the code for 'random signals' in handle_inferior_event | |
1686 | explain how we handle this case instead. | |
1687 | ||
bab37966 SM |
1688 | Returns DISPLACED_STEP_PREPARE_STATUS_OK if preparing was successful -- this |
1689 | thread is going to be stepped now; DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE | |
1690 | if displaced stepping this thread got queued; or | |
1691 | DISPLACED_STEP_PREPARE_STATUS_CANT if this instruction can't be displaced | |
1692 | stepped. */ | |
7f03bd92 | 1693 | |
bab37966 | 1694 | static displaced_step_prepare_status |
00431a78 | 1695 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1696 | { |
00431a78 | 1697 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1698 | struct gdbarch *gdbarch = regcache->arch (); |
187b041e SM |
1699 | displaced_step_thread_state &disp_step_thread_state |
1700 | = tp->displaced_step_state; | |
237fc4c9 PA |
1701 | |
1702 | /* We should never reach this function if the architecture does not | |
1703 | support displaced stepping. */ | |
9822cb57 | 1704 | gdb_assert (gdbarch_supports_displaced_stepping (gdbarch)); |
237fc4c9 | 1705 | |
c2829269 PA |
1706 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1707 | gdb_assert (tp->control.trap_expected); | |
1708 | ||
c1e36e3e PA |
1709 | /* Disable range stepping while executing in the scratch pad. We |
1710 | want a single-step even if executing the displaced instruction in | |
1711 | the scratch buffer lands within the stepping range (e.g., a | |
1712 | jump/branch). */ | |
1713 | tp->control.may_range_step = 0; | |
1714 | ||
187b041e SM |
1715 | /* We are about to start a displaced step for this thread. If one is already |
1716 | in progress, something's wrong. */ | |
1717 | gdb_assert (!disp_step_thread_state.in_progress ()); | |
237fc4c9 | 1718 | |
187b041e | 1719 | if (tp->inf->displaced_step_state.unavailable) |
237fc4c9 | 1720 | { |
187b041e SM |
1721 | /* The gdbarch tells us it's not worth asking to try a prepare because |
1722 | it is likely that it will return unavailable, so don't bother asking. */ | |
237fc4c9 | 1723 | |
136821d9 | 1724 | displaced_debug_printf ("deferring step of %s", |
0fab7955 | 1725 | tp->ptid.to_string ().c_str ()); |
237fc4c9 | 1726 | |
28d5518b | 1727 | global_thread_step_over_chain_enqueue (tp); |
bab37966 | 1728 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; |
237fc4c9 | 1729 | } |
237fc4c9 | 1730 | |
187b041e | 1731 | displaced_debug_printf ("displaced-stepping %s now", |
0fab7955 | 1732 | tp->ptid.to_string ().c_str ()); |
237fc4c9 | 1733 | |
00431a78 PA |
1734 | scoped_restore_current_thread restore_thread; |
1735 | ||
1736 | switch_to_thread (tp); | |
ad53cd71 | 1737 | |
187b041e SM |
1738 | CORE_ADDR original_pc = regcache_read_pc (regcache); |
1739 | CORE_ADDR displaced_pc; | |
237fc4c9 | 1740 | |
187b041e SM |
1741 | displaced_step_prepare_status status |
1742 | = gdbarch_displaced_step_prepare (gdbarch, tp, displaced_pc); | |
237fc4c9 | 1743 | |
187b041e | 1744 | if (status == DISPLACED_STEP_PREPARE_STATUS_CANT) |
d35ae833 | 1745 | { |
187b041e | 1746 | displaced_debug_printf ("failed to prepare (%s)", |
0fab7955 | 1747 | tp->ptid.to_string ().c_str ()); |
d35ae833 | 1748 | |
bab37966 | 1749 | return DISPLACED_STEP_PREPARE_STATUS_CANT; |
d35ae833 | 1750 | } |
187b041e | 1751 | else if (status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
7f03bd92 | 1752 | { |
187b041e SM |
1753 | /* Not enough displaced stepping resources available, defer this |
1754 | request by placing it the queue. */ | |
1755 | ||
1756 | displaced_debug_printf ("not enough resources available, " | |
1757 | "deferring step of %s", | |
0fab7955 | 1758 | tp->ptid.to_string ().c_str ()); |
187b041e SM |
1759 | |
1760 | global_thread_step_over_chain_enqueue (tp); | |
1761 | ||
1762 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; | |
7f03bd92 | 1763 | } |
237fc4c9 | 1764 | |
187b041e SM |
1765 | gdb_assert (status == DISPLACED_STEP_PREPARE_STATUS_OK); |
1766 | ||
9f5a595d UW |
1767 | /* Save the information we need to fix things up if the step |
1768 | succeeds. */ | |
187b041e | 1769 | disp_step_thread_state.set (gdbarch); |
9f5a595d | 1770 | |
187b041e | 1771 | tp->inf->displaced_step_state.in_progress_count++; |
ad53cd71 | 1772 | |
187b041e SM |
1773 | displaced_debug_printf ("prepared successfully thread=%s, " |
1774 | "original_pc=%s, displaced_pc=%s", | |
0fab7955 | 1775 | tp->ptid.to_string ().c_str (), |
187b041e SM |
1776 | paddress (gdbarch, original_pc), |
1777 | paddress (gdbarch, displaced_pc)); | |
237fc4c9 | 1778 | |
bab37966 | 1779 | return DISPLACED_STEP_PREPARE_STATUS_OK; |
237fc4c9 PA |
1780 | } |
1781 | ||
3fc8eb30 PA |
1782 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1783 | attempts at displaced stepping if we get a memory error. */ | |
1784 | ||
bab37966 | 1785 | static displaced_step_prepare_status |
00431a78 | 1786 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 | 1787 | { |
bab37966 SM |
1788 | displaced_step_prepare_status status |
1789 | = DISPLACED_STEP_PREPARE_STATUS_CANT; | |
3fc8eb30 | 1790 | |
a70b8144 | 1791 | try |
3fc8eb30 | 1792 | { |
bab37966 | 1793 | status = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1794 | } |
230d2906 | 1795 | catch (const gdb_exception_error &ex) |
3fc8eb30 | 1796 | { |
16b41842 PA |
1797 | if (ex.error != MEMORY_ERROR |
1798 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1799 | throw; |
3fc8eb30 | 1800 | |
1eb8556f SM |
1801 | infrun_debug_printf ("caught exception, disabling displaced stepping: %s", |
1802 | ex.what ()); | |
3fc8eb30 PA |
1803 | |
1804 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1805 | "auto". */ | |
1806 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1807 | { | |
fd7dcb94 | 1808 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1809 | ex.what ()); |
3fc8eb30 PA |
1810 | } |
1811 | ||
1812 | /* Disable further displaced stepping attempts. */ | |
f5f01699 | 1813 | thread->inf->displaced_step_state.failed_before = 1; |
3fc8eb30 | 1814 | } |
3fc8eb30 | 1815 | |
bab37966 | 1816 | return status; |
3fc8eb30 PA |
1817 | } |
1818 | ||
bab37966 SM |
1819 | /* If we displaced stepped an instruction successfully, adjust registers and |
1820 | memory to yield the same effect the instruction would have had if we had | |
1821 | executed it at its original address, and return | |
1822 | DISPLACED_STEP_FINISH_STATUS_OK. If the instruction didn't complete, | |
1823 | relocate the PC and return DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED. | |
372316f1 | 1824 | |
bab37966 SM |
1825 | If the thread wasn't displaced stepping, return |
1826 | DISPLACED_STEP_FINISH_STATUS_OK as well. */ | |
1827 | ||
1828 | static displaced_step_finish_status | |
7def77a1 | 1829 | displaced_step_finish (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1830 | { |
187b041e | 1831 | displaced_step_thread_state *displaced = &event_thread->displaced_step_state; |
fc1cf338 | 1832 | |
187b041e SM |
1833 | /* Was this thread performing a displaced step? */ |
1834 | if (!displaced->in_progress ()) | |
bab37966 | 1835 | return DISPLACED_STEP_FINISH_STATUS_OK; |
237fc4c9 | 1836 | |
187b041e SM |
1837 | gdb_assert (event_thread->inf->displaced_step_state.in_progress_count > 0); |
1838 | event_thread->inf->displaced_step_state.in_progress_count--; | |
1839 | ||
cb71640d PA |
1840 | /* Fixup may need to read memory/registers. Switch to the thread |
1841 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
d43b7a2d | 1842 | the current thread, and displaced_step_restore performs ptid-dependent |
328d42d8 | 1843 | memory accesses using current_inferior(). */ |
00431a78 | 1844 | switch_to_thread (event_thread); |
cb71640d | 1845 | |
d43b7a2d TBA |
1846 | displaced_step_reset_cleanup cleanup (displaced); |
1847 | ||
187b041e SM |
1848 | /* Do the fixup, and release the resources acquired to do the displaced |
1849 | step. */ | |
1850 | return gdbarch_displaced_step_finish (displaced->get_original_gdbarch (), | |
1851 | event_thread, signal); | |
c2829269 | 1852 | } |
1c5cfe86 | 1853 | |
4d9d9d04 PA |
1854 | /* Data to be passed around while handling an event. This data is |
1855 | discarded between events. */ | |
1856 | struct execution_control_state | |
1857 | { | |
183be222 SM |
1858 | execution_control_state () |
1859 | { | |
1860 | this->reset (); | |
1861 | } | |
1862 | ||
1863 | void reset () | |
1864 | { | |
1865 | this->target = nullptr; | |
1866 | this->ptid = null_ptid; | |
1867 | this->event_thread = nullptr; | |
1868 | ws = target_waitstatus (); | |
1869 | stop_func_filled_in = 0; | |
1870 | stop_func_start = 0; | |
1871 | stop_func_end = 0; | |
1872 | stop_func_name = nullptr; | |
1873 | wait_some_more = 0; | |
1874 | hit_singlestep_breakpoint = 0; | |
1875 | } | |
1876 | ||
5b6d1e4f | 1877 | process_stratum_target *target; |
4d9d9d04 PA |
1878 | ptid_t ptid; |
1879 | /* The thread that got the event, if this was a thread event; NULL | |
1880 | otherwise. */ | |
1881 | struct thread_info *event_thread; | |
1882 | ||
1883 | struct target_waitstatus ws; | |
1884 | int stop_func_filled_in; | |
1885 | CORE_ADDR stop_func_start; | |
1886 | CORE_ADDR stop_func_end; | |
1887 | const char *stop_func_name; | |
1888 | int wait_some_more; | |
1889 | ||
1890 | /* True if the event thread hit the single-step breakpoint of | |
1891 | another thread. Thus the event doesn't cause a stop, the thread | |
1892 | needs to be single-stepped past the single-step breakpoint before | |
1893 | we can switch back to the original stepping thread. */ | |
1894 | int hit_singlestep_breakpoint; | |
1895 | }; | |
1896 | ||
1897 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1898 | |
1899 | static void | |
4d9d9d04 PA |
1900 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1901 | { | |
183be222 | 1902 | ecs->reset (); |
4d9d9d04 PA |
1903 | ecs->event_thread = tp; |
1904 | ecs->ptid = tp->ptid; | |
1905 | } | |
1906 | ||
1907 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1908 | static void prepare_to_wait (struct execution_control_state *ecs); | |
c4464ade | 1909 | static bool keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1910 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1911 | |
1912 | /* Are there any pending step-over requests? If so, run all we can | |
1913 | now and return true. Otherwise, return false. */ | |
1914 | ||
c4464ade | 1915 | static bool |
c2829269 PA |
1916 | start_step_over (void) |
1917 | { | |
3ec3145c SM |
1918 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
1919 | ||
372316f1 PA |
1920 | /* Don't start a new step-over if we already have an in-line |
1921 | step-over operation ongoing. */ | |
1922 | if (step_over_info_valid_p ()) | |
c4464ade | 1923 | return false; |
372316f1 | 1924 | |
187b041e SM |
1925 | /* Steal the global thread step over chain. As we try to initiate displaced |
1926 | steps, threads will be enqueued in the global chain if no buffers are | |
1927 | available. If we iterated on the global chain directly, we might iterate | |
1928 | indefinitely. */ | |
8b6a69b2 SM |
1929 | thread_step_over_list threads_to_step |
1930 | = std::move (global_thread_step_over_list); | |
187b041e SM |
1931 | |
1932 | infrun_debug_printf ("stealing global queue of threads to step, length = %d", | |
1933 | thread_step_over_chain_length (threads_to_step)); | |
1934 | ||
1935 | bool started = false; | |
1936 | ||
1937 | /* On scope exit (whatever the reason, return or exception), if there are | |
1938 | threads left in the THREADS_TO_STEP chain, put back these threads in the | |
1939 | global list. */ | |
1940 | SCOPE_EXIT | |
1941 | { | |
8b6a69b2 | 1942 | if (threads_to_step.empty ()) |
187b041e SM |
1943 | infrun_debug_printf ("step-over queue now empty"); |
1944 | else | |
1945 | { | |
1946 | infrun_debug_printf ("putting back %d threads to step in global queue", | |
1947 | thread_step_over_chain_length (threads_to_step)); | |
1948 | ||
8b6a69b2 SM |
1949 | global_thread_step_over_chain_enqueue_chain |
1950 | (std::move (threads_to_step)); | |
187b041e SM |
1951 | } |
1952 | }; | |
1953 | ||
8b6a69b2 SM |
1954 | thread_step_over_list_safe_range range |
1955 | = make_thread_step_over_list_safe_range (threads_to_step); | |
1956 | ||
1957 | for (thread_info *tp : range) | |
237fc4c9 | 1958 | { |
4d9d9d04 PA |
1959 | struct execution_control_state ecss; |
1960 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1961 | step_over_what step_what; |
372316f1 | 1962 | int must_be_in_line; |
c2829269 | 1963 | |
c65d6b55 PA |
1964 | gdb_assert (!tp->stop_requested); |
1965 | ||
187b041e SM |
1966 | if (tp->inf->displaced_step_state.unavailable) |
1967 | { | |
1968 | /* The arch told us to not even try preparing another displaced step | |
1969 | for this inferior. Just leave the thread in THREADS_TO_STEP, it | |
1970 | will get moved to the global chain on scope exit. */ | |
1971 | continue; | |
1972 | } | |
1973 | ||
d8bbae6e SM |
1974 | if (tp->inf->thread_waiting_for_vfork_done != nullptr) |
1975 | { | |
1976 | /* When we stop all threads, handling a vfork, any thread in the step | |
1977 | over chain remains there. A user could also try to continue a | |
1978 | thread stopped at a breakpoint while another thread is waiting for | |
1979 | a vfork-done event. In any case, we don't want to start a step | |
1980 | over right now. */ | |
1981 | continue; | |
1982 | } | |
1983 | ||
187b041e SM |
1984 | /* Remove thread from the THREADS_TO_STEP chain. If anything goes wrong |
1985 | while we try to prepare the displaced step, we don't add it back to | |
1986 | the global step over chain. This is to avoid a thread staying in the | |
1987 | step over chain indefinitely if something goes wrong when resuming it | |
1988 | If the error is intermittent and it still needs a step over, it will | |
1989 | get enqueued again when we try to resume it normally. */ | |
8b6a69b2 | 1990 | threads_to_step.erase (threads_to_step.iterator_to (*tp)); |
c2829269 | 1991 | |
372316f1 PA |
1992 | step_what = thread_still_needs_step_over (tp); |
1993 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1994 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1995 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1996 | |
1997 | /* We currently stop all threads of all processes to step-over | |
1998 | in-line. If we need to start a new in-line step-over, let | |
1999 | any pending displaced steps finish first. */ | |
187b041e SM |
2000 | if (must_be_in_line && displaced_step_in_progress_any_thread ()) |
2001 | { | |
2002 | global_thread_step_over_chain_enqueue (tp); | |
2003 | continue; | |
2004 | } | |
c2829269 | 2005 | |
372316f1 | 2006 | if (tp->control.trap_expected |
7846f3aa | 2007 | || tp->resumed () |
611841bb | 2008 | || tp->executing ()) |
ad53cd71 | 2009 | { |
4d9d9d04 PA |
2010 | internal_error (__FILE__, __LINE__, |
2011 | "[%s] has inconsistent state: " | |
372316f1 | 2012 | "trap_expected=%d, resumed=%d, executing=%d\n", |
0fab7955 | 2013 | tp->ptid.to_string ().c_str (), |
4d9d9d04 | 2014 | tp->control.trap_expected, |
7846f3aa | 2015 | tp->resumed (), |
611841bb | 2016 | tp->executing ()); |
ad53cd71 | 2017 | } |
1c5cfe86 | 2018 | |
1eb8556f | 2019 | infrun_debug_printf ("resuming [%s] for step-over", |
0fab7955 | 2020 | tp->ptid.to_string ().c_str ()); |
4d9d9d04 PA |
2021 | |
2022 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2023 | is no longer inserted. In all-stop, we want to keep looking | |
2024 | for a thread that needs a step-over instead of resuming TP, | |
2025 | because we wouldn't be able to resume anything else until the | |
2026 | target stops again. In non-stop, the resume always resumes | |
2027 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2028 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2029 | continue; |
8550d3b3 | 2030 | |
00431a78 | 2031 | switch_to_thread (tp); |
4d9d9d04 PA |
2032 | reset_ecs (ecs, tp); |
2033 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2034 | |
4d9d9d04 PA |
2035 | if (!ecs->wait_some_more) |
2036 | error (_("Command aborted.")); | |
1c5cfe86 | 2037 | |
187b041e SM |
2038 | /* If the thread's step over could not be initiated because no buffers |
2039 | were available, it was re-added to the global step over chain. */ | |
7846f3aa | 2040 | if (tp->resumed ()) |
187b041e SM |
2041 | { |
2042 | infrun_debug_printf ("[%s] was resumed.", | |
0fab7955 | 2043 | tp->ptid.to_string ().c_str ()); |
187b041e SM |
2044 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2045 | } | |
2046 | else | |
2047 | { | |
2048 | infrun_debug_printf ("[%s] was NOT resumed.", | |
0fab7955 | 2049 | tp->ptid.to_string ().c_str ()); |
187b041e SM |
2050 | gdb_assert (thread_is_in_step_over_chain (tp)); |
2051 | } | |
372316f1 PA |
2052 | |
2053 | /* If we started a new in-line step-over, we're done. */ | |
2054 | if (step_over_info_valid_p ()) | |
2055 | { | |
2056 | gdb_assert (tp->control.trap_expected); | |
187b041e SM |
2057 | started = true; |
2058 | break; | |
372316f1 PA |
2059 | } |
2060 | ||
fbea99ea | 2061 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2062 | { |
2063 | /* On all-stop, shouldn't have resumed unless we needed a | |
2064 | step over. */ | |
2065 | gdb_assert (tp->control.trap_expected | |
2066 | || tp->step_after_step_resume_breakpoint); | |
2067 | ||
2068 | /* With remote targets (at least), in all-stop, we can't | |
2069 | issue any further remote commands until the program stops | |
2070 | again. */ | |
187b041e SM |
2071 | started = true; |
2072 | break; | |
1c5cfe86 | 2073 | } |
c2829269 | 2074 | |
4d9d9d04 PA |
2075 | /* Either the thread no longer needed a step-over, or a new |
2076 | displaced stepping sequence started. Even in the latter | |
2077 | case, continue looking. Maybe we can also start another | |
2078 | displaced step on a thread of other process. */ | |
237fc4c9 | 2079 | } |
4d9d9d04 | 2080 | |
187b041e | 2081 | return started; |
237fc4c9 PA |
2082 | } |
2083 | ||
5231c1fd PA |
2084 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2085 | holding OLD_PTID. */ | |
2086 | static void | |
b161a60d SM |
2087 | infrun_thread_ptid_changed (process_stratum_target *target, |
2088 | ptid_t old_ptid, ptid_t new_ptid) | |
5231c1fd | 2089 | { |
b161a60d SM |
2090 | if (inferior_ptid == old_ptid |
2091 | && current_inferior ()->process_target () == target) | |
5231c1fd | 2092 | inferior_ptid = new_ptid; |
5231c1fd PA |
2093 | } |
2094 | ||
237fc4c9 | 2095 | \f |
c906108c | 2096 | |
53904c9e AC |
2097 | static const char schedlock_off[] = "off"; |
2098 | static const char schedlock_on[] = "on"; | |
2099 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2100 | static const char schedlock_replay[] = "replay"; |
40478521 | 2101 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2102 | schedlock_off, |
2103 | schedlock_on, | |
2104 | schedlock_step, | |
f2665db5 | 2105 | schedlock_replay, |
ef346e04 AC |
2106 | NULL |
2107 | }; | |
f2665db5 | 2108 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2109 | static void |
2110 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2111 | struct cmd_list_element *c, const char *value) | |
2112 | { | |
6cb06a8c TT |
2113 | gdb_printf (file, |
2114 | _("Mode for locking scheduler " | |
2115 | "during execution is \"%s\".\n"), | |
2116 | value); | |
920d2a44 | 2117 | } |
c906108c SS |
2118 | |
2119 | static void | |
eb4c3f4a | 2120 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2121 | { |
8a3ecb79 | 2122 | if (!target_can_lock_scheduler ()) |
eefe576e AC |
2123 | { |
2124 | scheduler_mode = schedlock_off; | |
d777bf0d SM |
2125 | error (_("Target '%s' cannot support this command."), |
2126 | target_shortname ()); | |
eefe576e | 2127 | } |
c906108c SS |
2128 | } |
2129 | ||
d4db2f36 PA |
2130 | /* True if execution commands resume all threads of all processes by |
2131 | default; otherwise, resume only threads of the current inferior | |
2132 | process. */ | |
491144b5 | 2133 | bool sched_multi = false; |
d4db2f36 | 2134 | |
22b11ba9 LS |
2135 | /* Try to setup for software single stepping. Return true if target_resume() |
2136 | should use hardware single step. | |
2facfe5c | 2137 | |
22b11ba9 | 2138 | GDBARCH the current gdbarch. */ |
2facfe5c | 2139 | |
c4464ade | 2140 | static bool |
22b11ba9 | 2141 | maybe_software_singlestep (struct gdbarch *gdbarch) |
2facfe5c | 2142 | { |
c4464ade | 2143 | bool hw_step = true; |
2facfe5c | 2144 | |
f02253f1 | 2145 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2146 | && gdbarch_software_single_step_p (gdbarch)) |
2147 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2148 | ||
2facfe5c DD |
2149 | return hw_step; |
2150 | } | |
c906108c | 2151 | |
f3263aa4 PA |
2152 | /* See infrun.h. */ |
2153 | ||
09cee04b PA |
2154 | ptid_t |
2155 | user_visible_resume_ptid (int step) | |
2156 | { | |
f3263aa4 | 2157 | ptid_t resume_ptid; |
09cee04b | 2158 | |
09cee04b PA |
2159 | if (non_stop) |
2160 | { | |
2161 | /* With non-stop mode on, threads are always handled | |
2162 | individually. */ | |
2163 | resume_ptid = inferior_ptid; | |
2164 | } | |
2165 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2166 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2167 | { |
f3263aa4 PA |
2168 | /* User-settable 'scheduler' mode requires solo thread |
2169 | resume. */ | |
09cee04b PA |
2170 | resume_ptid = inferior_ptid; |
2171 | } | |
f2665db5 MM |
2172 | else if ((scheduler_mode == schedlock_replay) |
2173 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2174 | { | |
2175 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2176 | mode. */ | |
2177 | resume_ptid = inferior_ptid; | |
2178 | } | |
f3263aa4 PA |
2179 | else if (!sched_multi && target_supports_multi_process ()) |
2180 | { | |
2181 | /* Resume all threads of the current process (and none of other | |
2182 | processes). */ | |
e99b03dc | 2183 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2184 | } |
2185 | else | |
2186 | { | |
2187 | /* Resume all threads of all processes. */ | |
2188 | resume_ptid = RESUME_ALL; | |
2189 | } | |
09cee04b PA |
2190 | |
2191 | return resume_ptid; | |
2192 | } | |
2193 | ||
5b6d1e4f PA |
2194 | /* See infrun.h. */ |
2195 | ||
2196 | process_stratum_target * | |
2197 | user_visible_resume_target (ptid_t resume_ptid) | |
2198 | { | |
2199 | return (resume_ptid == minus_one_ptid && sched_multi | |
2200 | ? NULL | |
2201 | : current_inferior ()->process_target ()); | |
2202 | } | |
2203 | ||
fbea99ea PA |
2204 | /* Return a ptid representing the set of threads that we will resume, |
2205 | in the perspective of the target, assuming run control handling | |
2206 | does not require leaving some threads stopped (e.g., stepping past | |
2207 | breakpoint). USER_STEP indicates whether we're about to start the | |
2208 | target for a stepping command. */ | |
2209 | ||
2210 | static ptid_t | |
2211 | internal_resume_ptid (int user_step) | |
2212 | { | |
2213 | /* In non-stop, we always control threads individually. Note that | |
2214 | the target may always work in non-stop mode even with "set | |
2215 | non-stop off", in which case user_visible_resume_ptid could | |
2216 | return a wildcard ptid. */ | |
2217 | if (target_is_non_stop_p ()) | |
2218 | return inferior_ptid; | |
d8bbae6e SM |
2219 | |
2220 | /* The rest of the function assumes non-stop==off and | |
2221 | target-non-stop==off. | |
2222 | ||
2223 | If a thread is waiting for a vfork-done event, it means breakpoints are out | |
2224 | for this inferior (well, program space in fact). We don't want to resume | |
2225 | any thread other than the one waiting for vfork done, otherwise these other | |
2226 | threads could miss breakpoints. So if a thread in the resumption set is | |
2227 | waiting for a vfork-done event, resume only that thread. | |
2228 | ||
2229 | The resumption set width depends on whether schedule-multiple is on or off. | |
2230 | ||
2231 | Note that if the target_resume interface was more flexible, we could be | |
2232 | smarter here when schedule-multiple is on. For example, imagine 3 | |
2233 | inferiors with 2 threads each (1.1, 1.2, 2.1, 2.2, 3.1 and 3.2). Threads | |
2234 | 2.1 and 3.2 are both waiting for a vfork-done event. Then we could ask the | |
2235 | target(s) to resume: | |
2236 | ||
2237 | - All threads of inferior 1 | |
2238 | - Thread 2.1 | |
2239 | - Thread 3.2 | |
2240 | ||
2241 | Since we don't have that flexibility (we can only pass one ptid), just | |
2242 | resume the first thread waiting for a vfork-done event we find (e.g. thread | |
2243 | 2.1). */ | |
2244 | if (sched_multi) | |
2245 | { | |
2246 | for (inferior *inf : all_non_exited_inferiors ()) | |
2247 | if (inf->thread_waiting_for_vfork_done != nullptr) | |
2248 | return inf->thread_waiting_for_vfork_done->ptid; | |
2249 | } | |
2250 | else if (current_inferior ()->thread_waiting_for_vfork_done != nullptr) | |
2251 | return current_inferior ()->thread_waiting_for_vfork_done->ptid; | |
2252 | ||
2253 | return user_visible_resume_ptid (user_step); | |
fbea99ea PA |
2254 | } |
2255 | ||
64ce06e4 PA |
2256 | /* Wrapper for target_resume, that handles infrun-specific |
2257 | bookkeeping. */ | |
2258 | ||
2259 | static void | |
c4464ade | 2260 | do_target_resume (ptid_t resume_ptid, bool step, enum gdb_signal sig) |
64ce06e4 PA |
2261 | { |
2262 | struct thread_info *tp = inferior_thread (); | |
2263 | ||
c65d6b55 PA |
2264 | gdb_assert (!tp->stop_requested); |
2265 | ||
64ce06e4 | 2266 | /* Install inferior's terminal modes. */ |
223ffa71 | 2267 | target_terminal::inferior (); |
64ce06e4 PA |
2268 | |
2269 | /* Avoid confusing the next resume, if the next stop/resume | |
2270 | happens to apply to another thread. */ | |
1edb66d8 | 2271 | tp->set_stop_signal (GDB_SIGNAL_0); |
64ce06e4 | 2272 | |
8f572e5c PA |
2273 | /* Advise target which signals may be handled silently. |
2274 | ||
2275 | If we have removed breakpoints because we are stepping over one | |
2276 | in-line (in any thread), we need to receive all signals to avoid | |
2277 | accidentally skipping a breakpoint during execution of a signal | |
2278 | handler. | |
2279 | ||
2280 | Likewise if we're displaced stepping, otherwise a trap for a | |
2281 | breakpoint in a signal handler might be confused with the | |
7def77a1 | 2282 | displaced step finishing. We don't make the displaced_step_finish |
8f572e5c PA |
2283 | step distinguish the cases instead, because: |
2284 | ||
2285 | - a backtrace while stopped in the signal handler would show the | |
2286 | scratch pad as frame older than the signal handler, instead of | |
2287 | the real mainline code. | |
2288 | ||
2289 | - when the thread is later resumed, the signal handler would | |
2290 | return to the scratch pad area, which would no longer be | |
2291 | valid. */ | |
2292 | if (step_over_info_valid_p () | |
00431a78 | 2293 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2294 | target_pass_signals ({}); |
64ce06e4 | 2295 | else |
adc6a863 | 2296 | target_pass_signals (signal_pass); |
64ce06e4 | 2297 | |
05d65a7a SM |
2298 | infrun_debug_printf ("resume_ptid=%s, step=%d, sig=%s", |
2299 | resume_ptid.to_string ().c_str (), | |
2300 | step, gdb_signal_to_symbol_string (sig)); | |
2301 | ||
64ce06e4 PA |
2302 | target_resume (resume_ptid, step, sig); |
2303 | } | |
2304 | ||
d930703d | 2305 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2306 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2307 | call 'resume', which handles exceptions. */ | |
c906108c | 2308 | |
71d378ae PA |
2309 | static void |
2310 | resume_1 (enum gdb_signal sig) | |
c906108c | 2311 | { |
515630c5 | 2312 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2313 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2314 | struct thread_info *tp = inferior_thread (); |
8b86c959 | 2315 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2316 | ptid_t resume_ptid; |
856e7dd6 PA |
2317 | /* This represents the user's step vs continue request. When |
2318 | deciding whether "set scheduler-locking step" applies, it's the | |
2319 | user's intention that counts. */ | |
2320 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2321 | /* This represents what we'll actually request the target to do. |
2322 | This can decay from a step to a continue, if e.g., we need to | |
2323 | implement single-stepping with breakpoints (software | |
2324 | single-step). */ | |
c4464ade | 2325 | bool step; |
c7e8a53c | 2326 | |
c65d6b55 | 2327 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2328 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2329 | ||
1edb66d8 | 2330 | if (tp->has_pending_waitstatus ()) |
372316f1 | 2331 | { |
1eb8556f SM |
2332 | infrun_debug_printf |
2333 | ("thread %s has pending wait " | |
2334 | "status %s (currently_stepping=%d).", | |
0fab7955 | 2335 | tp->ptid.to_string ().c_str (), |
7dca2ea7 | 2336 | tp->pending_waitstatus ().to_string ().c_str (), |
1eb8556f | 2337 | currently_stepping (tp)); |
372316f1 | 2338 | |
5b6d1e4f | 2339 | tp->inf->process_target ()->threads_executing = true; |
7846f3aa | 2340 | tp->set_resumed (true); |
372316f1 PA |
2341 | |
2342 | /* FIXME: What should we do if we are supposed to resume this | |
2343 | thread with a signal? Maybe we should maintain a queue of | |
2344 | pending signals to deliver. */ | |
2345 | if (sig != GDB_SIGNAL_0) | |
2346 | { | |
fd7dcb94 | 2347 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d | 2348 | gdb_signal_to_name (sig), |
0fab7955 | 2349 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
2350 | } |
2351 | ||
1edb66d8 | 2352 | tp->set_stop_signal (GDB_SIGNAL_0); |
372316f1 PA |
2353 | |
2354 | if (target_can_async_p ()) | |
9516f85a AB |
2355 | { |
2356 | target_async (1); | |
2357 | /* Tell the event loop we have an event to process. */ | |
2358 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2359 | } | |
372316f1 PA |
2360 | return; |
2361 | } | |
2362 | ||
2363 | tp->stepped_breakpoint = 0; | |
2364 | ||
6b403daa PA |
2365 | /* Depends on stepped_breakpoint. */ |
2366 | step = currently_stepping (tp); | |
2367 | ||
6f5d514f | 2368 | if (current_inferior ()->thread_waiting_for_vfork_done != nullptr) |
74609e71 | 2369 | { |
48f9886d PA |
2370 | /* Don't try to single-step a vfork parent that is waiting for |
2371 | the child to get out of the shared memory region (by exec'ing | |
2372 | or exiting). This is particularly important on software | |
2373 | single-step archs, as the child process would trip on the | |
2374 | software single step breakpoint inserted for the parent | |
2375 | process. Since the parent will not actually execute any | |
2376 | instruction until the child is out of the shared region (such | |
2377 | are vfork's semantics), it is safe to simply continue it. | |
2378 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2379 | the parent, and tell it to `keep_going', which automatically | |
2380 | re-sets it stepping. */ | |
1eb8556f | 2381 | infrun_debug_printf ("resume : clear step"); |
c4464ade | 2382 | step = false; |
74609e71 YQ |
2383 | } |
2384 | ||
7ca9b62a TBA |
2385 | CORE_ADDR pc = regcache_read_pc (regcache); |
2386 | ||
1eb8556f SM |
2387 | infrun_debug_printf ("step=%d, signal=%s, trap_expected=%d, " |
2388 | "current thread [%s] at %s", | |
2389 | step, gdb_signal_to_symbol_string (sig), | |
2390 | tp->control.trap_expected, | |
0fab7955 | 2391 | inferior_ptid.to_string ().c_str (), |
1eb8556f | 2392 | paddress (gdbarch, pc)); |
c906108c | 2393 | |
c2c6d25f JM |
2394 | /* Normally, by the time we reach `resume', the breakpoints are either |
2395 | removed or inserted, as appropriate. The exception is if we're sitting | |
2396 | at a permanent breakpoint; we need to step over it, but permanent | |
2397 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2398 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2399 | { |
af48d08f PA |
2400 | if (sig != GDB_SIGNAL_0) |
2401 | { | |
2402 | /* We have a signal to pass to the inferior. The resume | |
2403 | may, or may not take us to the signal handler. If this | |
2404 | is a step, we'll need to stop in the signal handler, if | |
2405 | there's one, (if the target supports stepping into | |
2406 | handlers), or in the next mainline instruction, if | |
2407 | there's no handler. If this is a continue, we need to be | |
2408 | sure to run the handler with all breakpoints inserted. | |
2409 | In all cases, set a breakpoint at the current address | |
2410 | (where the handler returns to), and once that breakpoint | |
2411 | is hit, resume skipping the permanent breakpoint. If | |
2412 | that breakpoint isn't hit, then we've stepped into the | |
2413 | signal handler (or hit some other event). We'll delete | |
2414 | the step-resume breakpoint then. */ | |
2415 | ||
1eb8556f SM |
2416 | infrun_debug_printf ("resume: skipping permanent breakpoint, " |
2417 | "deliver signal first"); | |
af48d08f PA |
2418 | |
2419 | clear_step_over_info (); | |
2420 | tp->control.trap_expected = 0; | |
2421 | ||
2422 | if (tp->control.step_resume_breakpoint == NULL) | |
2423 | { | |
2424 | /* Set a "high-priority" step-resume, as we don't want | |
2425 | user breakpoints at PC to trigger (again) when this | |
2426 | hits. */ | |
2427 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2428 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2429 | ||
2430 | tp->step_after_step_resume_breakpoint = step; | |
2431 | } | |
2432 | ||
2433 | insert_breakpoints (); | |
2434 | } | |
2435 | else | |
2436 | { | |
2437 | /* There's no signal to pass, we can go ahead and skip the | |
2438 | permanent breakpoint manually. */ | |
1eb8556f | 2439 | infrun_debug_printf ("skipping permanent breakpoint"); |
af48d08f PA |
2440 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); |
2441 | /* Update pc to reflect the new address from which we will | |
2442 | execute instructions. */ | |
2443 | pc = regcache_read_pc (regcache); | |
2444 | ||
2445 | if (step) | |
2446 | { | |
2447 | /* We've already advanced the PC, so the stepping part | |
2448 | is done. Now we need to arrange for a trap to be | |
2449 | reported to handle_inferior_event. Set a breakpoint | |
2450 | at the current PC, and run to it. Don't update | |
2451 | prev_pc, because if we end in | |
44a1ee51 PA |
2452 | switch_back_to_stepped_thread, we want the "expected |
2453 | thread advanced also" branch to be taken. IOW, we | |
2454 | don't want this thread to step further from PC | |
af48d08f | 2455 | (overstep). */ |
1ac806b8 | 2456 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2457 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2458 | insert_breakpoints (); | |
2459 | ||
fbea99ea | 2460 | resume_ptid = internal_resume_ptid (user_step); |
c4464ade | 2461 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
7846f3aa | 2462 | tp->set_resumed (true); |
af48d08f PA |
2463 | return; |
2464 | } | |
2465 | } | |
6d350bb5 | 2466 | } |
c2c6d25f | 2467 | |
c1e36e3e PA |
2468 | /* If we have a breakpoint to step over, make sure to do a single |
2469 | step only. Same if we have software watchpoints. */ | |
2470 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2471 | tp->control.may_range_step = 0; | |
2472 | ||
7da6a5b9 LM |
2473 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2474 | copy of the instruction at a different address. | |
237fc4c9 PA |
2475 | |
2476 | We can't use displaced stepping when we have a signal to deliver; | |
2477 | the comments for displaced_step_prepare explain why. The | |
2478 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2479 | signals' explain what we do instead. |
2480 | ||
2481 | We can't use displaced stepping when we are waiting for vfork_done | |
2482 | event, displaced stepping breaks the vfork child similarly as single | |
2483 | step software breakpoint. */ | |
3fc8eb30 PA |
2484 | if (tp->control.trap_expected |
2485 | && use_displaced_stepping (tp) | |
cb71640d | 2486 | && !step_over_info_valid_p () |
a493e3e2 | 2487 | && sig == GDB_SIGNAL_0 |
6f5d514f | 2488 | && current_inferior ()->thread_waiting_for_vfork_done == nullptr) |
237fc4c9 | 2489 | { |
bab37966 SM |
2490 | displaced_step_prepare_status prepare_status |
2491 | = displaced_step_prepare (tp); | |
fc1cf338 | 2492 | |
bab37966 | 2493 | if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
d56b7306 | 2494 | { |
1eb8556f | 2495 | infrun_debug_printf ("Got placed in step-over queue"); |
4d9d9d04 PA |
2496 | |
2497 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2498 | return; |
2499 | } | |
bab37966 | 2500 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_CANT) |
3fc8eb30 PA |
2501 | { |
2502 | /* Fallback to stepping over the breakpoint in-line. */ | |
2503 | ||
2504 | if (target_is_non_stop_p ()) | |
4f5539f0 | 2505 | stop_all_threads ("displaced stepping falling back on inline stepping"); |
3fc8eb30 | 2506 | |
a01bda52 | 2507 | set_step_over_info (regcache->aspace (), |
21edc42f | 2508 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 | 2509 | |
22b11ba9 | 2510 | step = maybe_software_singlestep (gdbarch); |
3fc8eb30 PA |
2511 | |
2512 | insert_breakpoints (); | |
2513 | } | |
bab37966 | 2514 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_OK) |
3fc8eb30 | 2515 | { |
3fc8eb30 PA |
2516 | /* Update pc to reflect the new address from which we will |
2517 | execute instructions due to displaced stepping. */ | |
00431a78 | 2518 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2519 | |
40a53766 | 2520 | step = gdbarch_displaced_step_hw_singlestep (gdbarch); |
3fc8eb30 | 2521 | } |
bab37966 | 2522 | else |
557b4d76 SM |
2523 | gdb_assert_not_reached ("Invalid displaced_step_prepare_status " |
2524 | "value."); | |
237fc4c9 PA |
2525 | } |
2526 | ||
2facfe5c | 2527 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2528 | else if (step) |
22b11ba9 | 2529 | step = maybe_software_singlestep (gdbarch); |
c906108c | 2530 | |
30852783 UW |
2531 | /* Currently, our software single-step implementation leads to different |
2532 | results than hardware single-stepping in one situation: when stepping | |
2533 | into delivering a signal which has an associated signal handler, | |
2534 | hardware single-step will stop at the first instruction of the handler, | |
2535 | while software single-step will simply skip execution of the handler. | |
2536 | ||
2537 | For now, this difference in behavior is accepted since there is no | |
2538 | easy way to actually implement single-stepping into a signal handler | |
2539 | without kernel support. | |
2540 | ||
2541 | However, there is one scenario where this difference leads to follow-on | |
2542 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2543 | and then single-stepping. In this case, the software single-step | |
2544 | behavior means that even if there is a *breakpoint* in the signal | |
2545 | handler, GDB still would not stop. | |
2546 | ||
2547 | Fortunately, we can at least fix this particular issue. We detect | |
2548 | here the case where we are about to deliver a signal while software | |
2549 | single-stepping with breakpoints removed. In this situation, we | |
2550 | revert the decisions to remove all breakpoints and insert single- | |
2551 | step breakpoints, and instead we install a step-resume breakpoint | |
2552 | at the current address, deliver the signal without stepping, and | |
2553 | once we arrive back at the step-resume breakpoint, actually step | |
2554 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2555 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2556 | && sig != GDB_SIGNAL_0 |
2557 | && step_over_info_valid_p ()) | |
30852783 UW |
2558 | { |
2559 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2560 | immediately after a handler returns, might already have |
30852783 UW |
2561 | a step-resume breakpoint set on the earlier handler. We cannot |
2562 | set another step-resume breakpoint; just continue on until the | |
2563 | original breakpoint is hit. */ | |
2564 | if (tp->control.step_resume_breakpoint == NULL) | |
2565 | { | |
2c03e5be | 2566 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2567 | tp->step_after_step_resume_breakpoint = 1; |
2568 | } | |
2569 | ||
34b7e8a6 | 2570 | delete_single_step_breakpoints (tp); |
30852783 | 2571 | |
31e77af2 | 2572 | clear_step_over_info (); |
30852783 | 2573 | tp->control.trap_expected = 0; |
31e77af2 PA |
2574 | |
2575 | insert_breakpoints (); | |
30852783 UW |
2576 | } |
2577 | ||
b0f16a3e SM |
2578 | /* If STEP is set, it's a request to use hardware stepping |
2579 | facilities. But in that case, we should never | |
2580 | use singlestep breakpoint. */ | |
34b7e8a6 | 2581 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2582 | |
fbea99ea | 2583 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2584 | if (tp->control.trap_expected) |
b0f16a3e SM |
2585 | { |
2586 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2587 | hit, either by single-stepping the thread with the breakpoint |
2588 | removed, or by displaced stepping, with the breakpoint inserted. | |
2589 | In the former case, we need to single-step only this thread, | |
2590 | and keep others stopped, as they can miss this breakpoint if | |
2591 | allowed to run. That's not really a problem for displaced | |
2592 | stepping, but, we still keep other threads stopped, in case | |
2593 | another thread is also stopped for a breakpoint waiting for | |
2594 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2595 | resume_ptid = inferior_ptid; |
2596 | } | |
fbea99ea PA |
2597 | else |
2598 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2599 | |
7f5ef605 PA |
2600 | if (execution_direction != EXEC_REVERSE |
2601 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2602 | { |
372316f1 PA |
2603 | /* There are two cases where we currently need to step a |
2604 | breakpoint instruction when we have a signal to deliver: | |
2605 | ||
2606 | - See handle_signal_stop where we handle random signals that | |
2607 | could take out us out of the stepping range. Normally, in | |
2608 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2609 | signal handler with a breakpoint at PC, but there are cases |
2610 | where we should _always_ single-step, even if we have a | |
2611 | step-resume breakpoint, like when a software watchpoint is | |
2612 | set. Assuming single-stepping and delivering a signal at the | |
2613 | same time would takes us to the signal handler, then we could | |
2614 | have removed the breakpoint at PC to step over it. However, | |
2615 | some hardware step targets (like e.g., Mac OS) can't step | |
2616 | into signal handlers, and for those, we need to leave the | |
2617 | breakpoint at PC inserted, as otherwise if the handler | |
2618 | recurses and executes PC again, it'll miss the breakpoint. | |
2619 | So we leave the breakpoint inserted anyway, but we need to | |
2620 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2621 | that adjust_pc_after_break doesn't end up confused. |
2622 | ||
dda83cd7 | 2623 | - In non-stop if we insert a breakpoint (e.g., a step-resume) |
372316f1 PA |
2624 | in one thread after another thread that was stepping had been |
2625 | momentarily paused for a step-over. When we re-resume the | |
2626 | stepping thread, it may be resumed from that address with a | |
2627 | breakpoint that hasn't trapped yet. Seen with | |
2628 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2629 | do displaced stepping. */ | |
2630 | ||
1eb8556f | 2631 | infrun_debug_printf ("resume: [%s] stepped breakpoint", |
0fab7955 | 2632 | tp->ptid.to_string ().c_str ()); |
7f5ef605 PA |
2633 | |
2634 | tp->stepped_breakpoint = 1; | |
2635 | ||
b0f16a3e SM |
2636 | /* Most targets can step a breakpoint instruction, thus |
2637 | executing it normally. But if this one cannot, just | |
2638 | continue and we will hit it anyway. */ | |
7f5ef605 | 2639 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4464ade | 2640 | step = false; |
b0f16a3e | 2641 | } |
ef5cf84e | 2642 | |
b0f16a3e | 2643 | if (debug_displaced |
cb71640d | 2644 | && tp->control.trap_expected |
3fc8eb30 | 2645 | && use_displaced_stepping (tp) |
cb71640d | 2646 | && !step_over_info_valid_p ()) |
b0f16a3e | 2647 | { |
00431a78 | 2648 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2649 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2650 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2651 | gdb_byte buf[4]; | |
2652 | ||
b0f16a3e | 2653 | read_memory (actual_pc, buf, sizeof (buf)); |
136821d9 SM |
2654 | displaced_debug_printf ("run %s: %s", |
2655 | paddress (resume_gdbarch, actual_pc), | |
2656 | displaced_step_dump_bytes | |
2657 | (buf, sizeof (buf)).c_str ()); | |
b0f16a3e | 2658 | } |
237fc4c9 | 2659 | |
b0f16a3e SM |
2660 | if (tp->control.may_range_step) |
2661 | { | |
2662 | /* If we're resuming a thread with the PC out of the step | |
2663 | range, then we're doing some nested/finer run control | |
2664 | operation, like stepping the thread out of the dynamic | |
2665 | linker or the displaced stepping scratch pad. We | |
2666 | shouldn't have allowed a range step then. */ | |
2667 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2668 | } | |
c1e36e3e | 2669 | |
64ce06e4 | 2670 | do_target_resume (resume_ptid, step, sig); |
7846f3aa | 2671 | tp->set_resumed (true); |
c906108c | 2672 | } |
71d378ae PA |
2673 | |
2674 | /* Resume the inferior. SIG is the signal to give the inferior | |
2675 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2676 | rolls back state on error. */ | |
2677 | ||
aff4e175 | 2678 | static void |
71d378ae PA |
2679 | resume (gdb_signal sig) |
2680 | { | |
a70b8144 | 2681 | try |
71d378ae PA |
2682 | { |
2683 | resume_1 (sig); | |
2684 | } | |
230d2906 | 2685 | catch (const gdb_exception &ex) |
71d378ae PA |
2686 | { |
2687 | /* If resuming is being aborted for any reason, delete any | |
2688 | single-step breakpoint resume_1 may have created, to avoid | |
2689 | confusing the following resumption, and to avoid leaving | |
2690 | single-step breakpoints perturbing other threads, in case | |
2691 | we're running in non-stop mode. */ | |
2692 | if (inferior_ptid != null_ptid) | |
2693 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2694 | throw; |
71d378ae | 2695 | } |
71d378ae PA |
2696 | } |
2697 | ||
c906108c | 2698 | \f |
237fc4c9 | 2699 | /* Proceeding. */ |
c906108c | 2700 | |
4c2f2a79 PA |
2701 | /* See infrun.h. */ |
2702 | ||
2703 | /* Counter that tracks number of user visible stops. This can be used | |
2704 | to tell whether a command has proceeded the inferior past the | |
2705 | current location. This allows e.g., inferior function calls in | |
2706 | breakpoint commands to not interrupt the command list. When the | |
2707 | call finishes successfully, the inferior is standing at the same | |
2708 | breakpoint as if nothing happened (and so we don't call | |
2709 | normal_stop). */ | |
2710 | static ULONGEST current_stop_id; | |
2711 | ||
2712 | /* See infrun.h. */ | |
2713 | ||
2714 | ULONGEST | |
2715 | get_stop_id (void) | |
2716 | { | |
2717 | return current_stop_id; | |
2718 | } | |
2719 | ||
2720 | /* Called when we report a user visible stop. */ | |
2721 | ||
2722 | static void | |
2723 | new_stop_id (void) | |
2724 | { | |
2725 | current_stop_id++; | |
2726 | } | |
2727 | ||
c906108c SS |
2728 | /* Clear out all variables saying what to do when inferior is continued. |
2729 | First do this, then set the ones you want, then call `proceed'. */ | |
2730 | ||
a7212384 UW |
2731 | static void |
2732 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2733 | { |
0fab7955 | 2734 | infrun_debug_printf ("%s", tp->ptid.to_string ().c_str ()); |
d6b48e9c | 2735 | |
372316f1 PA |
2736 | /* If we're starting a new sequence, then the previous finished |
2737 | single-step is no longer relevant. */ | |
1edb66d8 | 2738 | if (tp->has_pending_waitstatus ()) |
372316f1 | 2739 | { |
1edb66d8 | 2740 | if (tp->stop_reason () == TARGET_STOPPED_BY_SINGLE_STEP) |
372316f1 | 2741 | { |
1eb8556f SM |
2742 | infrun_debug_printf ("pending event of %s was a finished step. " |
2743 | "Discarding.", | |
0fab7955 | 2744 | tp->ptid.to_string ().c_str ()); |
372316f1 | 2745 | |
1edb66d8 SM |
2746 | tp->clear_pending_waitstatus (); |
2747 | tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON); | |
372316f1 | 2748 | } |
1eb8556f | 2749 | else |
372316f1 | 2750 | { |
1eb8556f SM |
2751 | infrun_debug_printf |
2752 | ("thread %s has pending wait status %s (currently_stepping=%d).", | |
0fab7955 | 2753 | tp->ptid.to_string ().c_str (), |
7dca2ea7 | 2754 | tp->pending_waitstatus ().to_string ().c_str (), |
1eb8556f | 2755 | currently_stepping (tp)); |
372316f1 PA |
2756 | } |
2757 | } | |
2758 | ||
70509625 PA |
2759 | /* If this signal should not be seen by program, give it zero. |
2760 | Used for debugging signals. */ | |
1edb66d8 SM |
2761 | if (!signal_pass_state (tp->stop_signal ())) |
2762 | tp->set_stop_signal (GDB_SIGNAL_0); | |
70509625 | 2763 | |
573269a8 | 2764 | tp->release_thread_fsm (); |
243a9253 | 2765 | |
16c381f0 JK |
2766 | tp->control.trap_expected = 0; |
2767 | tp->control.step_range_start = 0; | |
2768 | tp->control.step_range_end = 0; | |
c1e36e3e | 2769 | tp->control.may_range_step = 0; |
16c381f0 JK |
2770 | tp->control.step_frame_id = null_frame_id; |
2771 | tp->control.step_stack_frame_id = null_frame_id; | |
2772 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2773 | tp->control.step_start_function = NULL; |
a7212384 | 2774 | tp->stop_requested = 0; |
4e1c45ea | 2775 | |
16c381f0 | 2776 | tp->control.stop_step = 0; |
32400beb | 2777 | |
16c381f0 | 2778 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2779 | |
856e7dd6 | 2780 | tp->control.stepping_command = 0; |
17b2616c | 2781 | |
a7212384 | 2782 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2783 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2784 | } |
32400beb | 2785 | |
a7212384 | 2786 | void |
70509625 | 2787 | clear_proceed_status (int step) |
a7212384 | 2788 | { |
f2665db5 MM |
2789 | /* With scheduler-locking replay, stop replaying other threads if we're |
2790 | not replaying the user-visible resume ptid. | |
2791 | ||
2792 | This is a convenience feature to not require the user to explicitly | |
2793 | stop replaying the other threads. We're assuming that the user's | |
2794 | intent is to resume tracing the recorded process. */ | |
2795 | if (!non_stop && scheduler_mode == schedlock_replay | |
2796 | && target_record_is_replaying (minus_one_ptid) | |
2797 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2798 | execution_direction)) | |
2799 | target_record_stop_replaying (); | |
2800 | ||
08036331 | 2801 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2802 | { |
08036331 | 2803 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2804 | process_stratum_target *resume_target |
2805 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2806 | |
2807 | /* In all-stop mode, delete the per-thread status of all threads | |
2808 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2809 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2810 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2811 | } |
2812 | ||
d7e15655 | 2813 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2814 | { |
2815 | struct inferior *inferior; | |
2816 | ||
2817 | if (non_stop) | |
2818 | { | |
6c95b8df PA |
2819 | /* If in non-stop mode, only delete the per-thread status of |
2820 | the current thread. */ | |
a7212384 UW |
2821 | clear_proceed_status_thread (inferior_thread ()); |
2822 | } | |
6c95b8df | 2823 | |
d6b48e9c | 2824 | inferior = current_inferior (); |
16c381f0 | 2825 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2826 | } |
2827 | ||
76727919 | 2828 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2829 | } |
2830 | ||
99619bea PA |
2831 | /* Returns true if TP is still stopped at a breakpoint that needs |
2832 | stepping-over in order to make progress. If the breakpoint is gone | |
2833 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b | 2834 | |
c4464ade | 2835 | static bool |
6c4cfb24 | 2836 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2837 | { |
2838 | if (tp->stepping_over_breakpoint) | |
2839 | { | |
00431a78 | 2840 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2841 | |
a01bda52 | 2842 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2843 | regcache_read_pc (regcache)) |
2844 | == ordinary_breakpoint_here) | |
c4464ade | 2845 | return true; |
99619bea PA |
2846 | |
2847 | tp->stepping_over_breakpoint = 0; | |
2848 | } | |
2849 | ||
c4464ade | 2850 | return false; |
99619bea PA |
2851 | } |
2852 | ||
6c4cfb24 PA |
2853 | /* Check whether thread TP still needs to start a step-over in order |
2854 | to make progress when resumed. Returns an bitwise or of enum | |
2855 | step_over_what bits, indicating what needs to be stepped over. */ | |
2856 | ||
8d297bbf | 2857 | static step_over_what |
6c4cfb24 PA |
2858 | thread_still_needs_step_over (struct thread_info *tp) |
2859 | { | |
8d297bbf | 2860 | step_over_what what = 0; |
6c4cfb24 PA |
2861 | |
2862 | if (thread_still_needs_step_over_bp (tp)) | |
2863 | what |= STEP_OVER_BREAKPOINT; | |
2864 | ||
2865 | if (tp->stepping_over_watchpoint | |
9aed480c | 2866 | && !target_have_steppable_watchpoint ()) |
6c4cfb24 PA |
2867 | what |= STEP_OVER_WATCHPOINT; |
2868 | ||
2869 | return what; | |
2870 | } | |
2871 | ||
483805cf PA |
2872 | /* Returns true if scheduler locking applies. STEP indicates whether |
2873 | we're about to do a step/next-like command to a thread. */ | |
2874 | ||
c4464ade | 2875 | static bool |
856e7dd6 | 2876 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2877 | { |
2878 | return (scheduler_mode == schedlock_on | |
2879 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2880 | && tp->control.stepping_command) |
2881 | || (scheduler_mode == schedlock_replay | |
2882 | && target_record_will_replay (minus_one_ptid, | |
2883 | execution_direction))); | |
483805cf PA |
2884 | } |
2885 | ||
1192f124 SM |
2886 | /* Set process_stratum_target::COMMIT_RESUMED_STATE in all target |
2887 | stacks that have threads executing and don't have threads with | |
2888 | pending events. */ | |
5b6d1e4f PA |
2889 | |
2890 | static void | |
1192f124 SM |
2891 | maybe_set_commit_resumed_all_targets () |
2892 | { | |
b4b1a226 SM |
2893 | scoped_restore_current_thread restore_thread; |
2894 | ||
1192f124 SM |
2895 | for (inferior *inf : all_non_exited_inferiors ()) |
2896 | { | |
2897 | process_stratum_target *proc_target = inf->process_target (); | |
2898 | ||
2899 | if (proc_target->commit_resumed_state) | |
2900 | { | |
2901 | /* We already set this in a previous iteration, via another | |
2902 | inferior sharing the process_stratum target. */ | |
2903 | continue; | |
2904 | } | |
2905 | ||
2906 | /* If the target has no resumed threads, it would be useless to | |
2907 | ask it to commit the resumed threads. */ | |
2908 | if (!proc_target->threads_executing) | |
2909 | { | |
2910 | infrun_debug_printf ("not requesting commit-resumed for target " | |
2911 | "%s, no resumed threads", | |
2912 | proc_target->shortname ()); | |
2913 | continue; | |
2914 | } | |
2915 | ||
2916 | /* As an optimization, if a thread from this target has some | |
2917 | status to report, handle it before requiring the target to | |
2918 | commit its resumed threads: handling the status might lead to | |
2919 | resuming more threads. */ | |
273dadf2 | 2920 | if (proc_target->has_resumed_with_pending_wait_status ()) |
1192f124 SM |
2921 | { |
2922 | infrun_debug_printf ("not requesting commit-resumed for target %s, a" | |
2923 | " thread has a pending waitstatus", | |
2924 | proc_target->shortname ()); | |
2925 | continue; | |
2926 | } | |
2927 | ||
b4b1a226 SM |
2928 | switch_to_inferior_no_thread (inf); |
2929 | ||
2930 | if (target_has_pending_events ()) | |
2931 | { | |
2932 | infrun_debug_printf ("not requesting commit-resumed for target %s, " | |
2933 | "target has pending events", | |
2934 | proc_target->shortname ()); | |
2935 | continue; | |
2936 | } | |
2937 | ||
1192f124 SM |
2938 | infrun_debug_printf ("enabling commit-resumed for target %s", |
2939 | proc_target->shortname ()); | |
2940 | ||
2941 | proc_target->commit_resumed_state = true; | |
2942 | } | |
2943 | } | |
2944 | ||
2945 | /* See infrun.h. */ | |
2946 | ||
2947 | void | |
2948 | maybe_call_commit_resumed_all_targets () | |
5b6d1e4f PA |
2949 | { |
2950 | scoped_restore_current_thread restore_thread; | |
2951 | ||
1192f124 SM |
2952 | for (inferior *inf : all_non_exited_inferiors ()) |
2953 | { | |
2954 | process_stratum_target *proc_target = inf->process_target (); | |
2955 | ||
2956 | if (!proc_target->commit_resumed_state) | |
2957 | continue; | |
2958 | ||
2959 | switch_to_inferior_no_thread (inf); | |
2960 | ||
2961 | infrun_debug_printf ("calling commit_resumed for target %s", | |
2962 | proc_target->shortname()); | |
2963 | ||
2964 | target_commit_resumed (); | |
2965 | } | |
2966 | } | |
2967 | ||
2968 | /* To track nesting of scoped_disable_commit_resumed objects, ensuring | |
2969 | that only the outermost one attempts to re-enable | |
2970 | commit-resumed. */ | |
2971 | static bool enable_commit_resumed = true; | |
2972 | ||
2973 | /* See infrun.h. */ | |
2974 | ||
2975 | scoped_disable_commit_resumed::scoped_disable_commit_resumed | |
2976 | (const char *reason) | |
2977 | : m_reason (reason), | |
2978 | m_prev_enable_commit_resumed (enable_commit_resumed) | |
2979 | { | |
2980 | infrun_debug_printf ("reason=%s", m_reason); | |
2981 | ||
2982 | enable_commit_resumed = false; | |
5b6d1e4f PA |
2983 | |
2984 | for (inferior *inf : all_non_exited_inferiors ()) | |
1192f124 SM |
2985 | { |
2986 | process_stratum_target *proc_target = inf->process_target (); | |
5b6d1e4f | 2987 | |
1192f124 SM |
2988 | if (m_prev_enable_commit_resumed) |
2989 | { | |
2990 | /* This is the outermost instance: force all | |
2991 | COMMIT_RESUMED_STATE to false. */ | |
2992 | proc_target->commit_resumed_state = false; | |
2993 | } | |
2994 | else | |
2995 | { | |
2996 | /* This is not the outermost instance, we expect | |
2997 | COMMIT_RESUMED_STATE to have been cleared by the | |
2998 | outermost instance. */ | |
2999 | gdb_assert (!proc_target->commit_resumed_state); | |
3000 | } | |
3001 | } | |
3002 | } | |
3003 | ||
3004 | /* See infrun.h. */ | |
3005 | ||
3006 | void | |
3007 | scoped_disable_commit_resumed::reset () | |
3008 | { | |
3009 | if (m_reset) | |
3010 | return; | |
3011 | m_reset = true; | |
3012 | ||
3013 | infrun_debug_printf ("reason=%s", m_reason); | |
3014 | ||
3015 | gdb_assert (!enable_commit_resumed); | |
3016 | ||
3017 | enable_commit_resumed = m_prev_enable_commit_resumed; | |
3018 | ||
3019 | if (m_prev_enable_commit_resumed) | |
5b6d1e4f | 3020 | { |
1192f124 SM |
3021 | /* This is the outermost instance, re-enable |
3022 | COMMIT_RESUMED_STATE on the targets where it's possible. */ | |
3023 | maybe_set_commit_resumed_all_targets (); | |
3024 | } | |
3025 | else | |
3026 | { | |
3027 | /* This is not the outermost instance, we expect | |
3028 | COMMIT_RESUMED_STATE to still be false. */ | |
3029 | for (inferior *inf : all_non_exited_inferiors ()) | |
3030 | { | |
3031 | process_stratum_target *proc_target = inf->process_target (); | |
3032 | gdb_assert (!proc_target->commit_resumed_state); | |
3033 | } | |
3034 | } | |
3035 | } | |
3036 | ||
3037 | /* See infrun.h. */ | |
3038 | ||
3039 | scoped_disable_commit_resumed::~scoped_disable_commit_resumed () | |
3040 | { | |
3041 | reset (); | |
3042 | } | |
3043 | ||
3044 | /* See infrun.h. */ | |
3045 | ||
3046 | void | |
3047 | scoped_disable_commit_resumed::reset_and_commit () | |
3048 | { | |
3049 | reset (); | |
3050 | maybe_call_commit_resumed_all_targets (); | |
3051 | } | |
3052 | ||
3053 | /* See infrun.h. */ | |
3054 | ||
3055 | scoped_enable_commit_resumed::scoped_enable_commit_resumed | |
3056 | (const char *reason) | |
3057 | : m_reason (reason), | |
3058 | m_prev_enable_commit_resumed (enable_commit_resumed) | |
3059 | { | |
3060 | infrun_debug_printf ("reason=%s", m_reason); | |
3061 | ||
3062 | if (!enable_commit_resumed) | |
3063 | { | |
3064 | enable_commit_resumed = true; | |
3065 | ||
3066 | /* Re-enable COMMIT_RESUMED_STATE on the targets where it's | |
3067 | possible. */ | |
3068 | maybe_set_commit_resumed_all_targets (); | |
3069 | ||
3070 | maybe_call_commit_resumed_all_targets (); | |
3071 | } | |
3072 | } | |
3073 | ||
3074 | /* See infrun.h. */ | |
3075 | ||
3076 | scoped_enable_commit_resumed::~scoped_enable_commit_resumed () | |
3077 | { | |
3078 | infrun_debug_printf ("reason=%s", m_reason); | |
3079 | ||
3080 | gdb_assert (enable_commit_resumed); | |
3081 | ||
3082 | enable_commit_resumed = m_prev_enable_commit_resumed; | |
3083 | ||
3084 | if (!enable_commit_resumed) | |
3085 | { | |
3086 | /* Force all COMMIT_RESUMED_STATE back to false. */ | |
3087 | for (inferior *inf : all_non_exited_inferiors ()) | |
3088 | { | |
3089 | process_stratum_target *proc_target = inf->process_target (); | |
3090 | proc_target->commit_resumed_state = false; | |
3091 | } | |
5b6d1e4f PA |
3092 | } |
3093 | } | |
3094 | ||
2f4fcf00 PA |
3095 | /* Check that all the targets we're about to resume are in non-stop |
3096 | mode. Ideally, we'd only care whether all targets support | |
3097 | target-async, but we're not there yet. E.g., stop_all_threads | |
3098 | doesn't know how to handle all-stop targets. Also, the remote | |
3099 | protocol in all-stop mode is synchronous, irrespective of | |
3100 | target-async, which means that things like a breakpoint re-set | |
3101 | triggered by one target would try to read memory from all targets | |
3102 | and fail. */ | |
3103 | ||
3104 | static void | |
3105 | check_multi_target_resumption (process_stratum_target *resume_target) | |
3106 | { | |
3107 | if (!non_stop && resume_target == nullptr) | |
3108 | { | |
3109 | scoped_restore_current_thread restore_thread; | |
3110 | ||
3111 | /* This is used to track whether we're resuming more than one | |
3112 | target. */ | |
3113 | process_stratum_target *first_connection = nullptr; | |
3114 | ||
3115 | /* The first inferior we see with a target that does not work in | |
3116 | always-non-stop mode. */ | |
3117 | inferior *first_not_non_stop = nullptr; | |
3118 | ||
f058c521 | 3119 | for (inferior *inf : all_non_exited_inferiors ()) |
2f4fcf00 PA |
3120 | { |
3121 | switch_to_inferior_no_thread (inf); | |
3122 | ||
55f6301a | 3123 | if (!target_has_execution ()) |
2f4fcf00 PA |
3124 | continue; |
3125 | ||
3126 | process_stratum_target *proc_target | |
3127 | = current_inferior ()->process_target(); | |
3128 | ||
3129 | if (!target_is_non_stop_p ()) | |
3130 | first_not_non_stop = inf; | |
3131 | ||
3132 | if (first_connection == nullptr) | |
3133 | first_connection = proc_target; | |
3134 | else if (first_connection != proc_target | |
3135 | && first_not_non_stop != nullptr) | |
3136 | { | |
3137 | switch_to_inferior_no_thread (first_not_non_stop); | |
3138 | ||
3139 | proc_target = current_inferior ()->process_target(); | |
3140 | ||
3141 | error (_("Connection %d (%s) does not support " | |
3142 | "multi-target resumption."), | |
3143 | proc_target->connection_number, | |
3144 | make_target_connection_string (proc_target).c_str ()); | |
3145 | } | |
3146 | } | |
3147 | } | |
3148 | } | |
3149 | ||
c906108c SS |
3150 | /* Basic routine for continuing the program in various fashions. |
3151 | ||
3152 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
3153 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
3154 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
3155 | |
3156 | You should call clear_proceed_status before calling proceed. */ | |
3157 | ||
3158 | void | |
64ce06e4 | 3159 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 3160 | { |
3ec3145c SM |
3161 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
3162 | ||
e58b0e63 PA |
3163 | struct regcache *regcache; |
3164 | struct gdbarch *gdbarch; | |
e58b0e63 | 3165 | CORE_ADDR pc; |
4d9d9d04 PA |
3166 | struct execution_control_state ecss; |
3167 | struct execution_control_state *ecs = &ecss; | |
c906108c | 3168 | |
e58b0e63 PA |
3169 | /* If we're stopped at a fork/vfork, follow the branch set by the |
3170 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
3171 | resuming the current thread. */ | |
3172 | if (!follow_fork ()) | |
3173 | { | |
3174 | /* The target for some reason decided not to resume. */ | |
3175 | normal_stop (); | |
f148b27e | 3176 | if (target_can_async_p ()) |
b1a35af2 | 3177 | inferior_event_handler (INF_EXEC_COMPLETE); |
e58b0e63 PA |
3178 | return; |
3179 | } | |
3180 | ||
842951eb PA |
3181 | /* We'll update this if & when we switch to a new thread. */ |
3182 | previous_inferior_ptid = inferior_ptid; | |
3183 | ||
e58b0e63 | 3184 | regcache = get_current_regcache (); |
ac7936df | 3185 | gdbarch = regcache->arch (); |
8b86c959 YQ |
3186 | const address_space *aspace = regcache->aspace (); |
3187 | ||
fc75c28b TBA |
3188 | pc = regcache_read_pc_protected (regcache); |
3189 | ||
08036331 | 3190 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 3191 | |
99619bea | 3192 | /* Fill in with reasonable starting values. */ |
08036331 | 3193 | init_thread_stepping_state (cur_thr); |
99619bea | 3194 | |
08036331 | 3195 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 3196 | |
5b6d1e4f PA |
3197 | ptid_t resume_ptid |
3198 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
3199 | process_stratum_target *resume_target | |
3200 | = user_visible_resume_target (resume_ptid); | |
3201 | ||
2f4fcf00 PA |
3202 | check_multi_target_resumption (resume_target); |
3203 | ||
2acceee2 | 3204 | if (addr == (CORE_ADDR) -1) |
c906108c | 3205 | { |
351031f2 AB |
3206 | if (cur_thr->stop_pc_p () |
3207 | && pc == cur_thr->stop_pc () | |
af48d08f | 3208 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 3209 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
3210 | /* There is a breakpoint at the address we will resume at, |
3211 | step one instruction before inserting breakpoints so that | |
3212 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
3213 | breakpoint). |
3214 | ||
3215 | Note, we don't do this in reverse, because we won't | |
3216 | actually be executing the breakpoint insn anyway. | |
3217 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 3218 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
3219 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3220 | && gdbarch_single_step_through_delay (gdbarch, | |
3221 | get_current_frame ())) | |
3352ef37 AC |
3222 | /* We stepped onto an instruction that needs to be stepped |
3223 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 3224 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
3225 | } |
3226 | else | |
3227 | { | |
515630c5 | 3228 | regcache_write_pc (regcache, addr); |
c906108c SS |
3229 | } |
3230 | ||
70509625 | 3231 | if (siggnal != GDB_SIGNAL_DEFAULT) |
1edb66d8 | 3232 | cur_thr->set_stop_signal (siggnal); |
70509625 | 3233 | |
4d9d9d04 PA |
3234 | /* If an exception is thrown from this point on, make sure to |
3235 | propagate GDB's knowledge of the executing state to the | |
3236 | frontend/user running state. */ | |
5b6d1e4f | 3237 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
3238 | |
3239 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3240 | threads (e.g., we might need to set threads stepping over | |
3241 | breakpoints first), from the user/frontend's point of view, all | |
3242 | threads in RESUME_PTID are now running. Unless we're calling an | |
3243 | inferior function, as in that case we pretend the inferior | |
3244 | doesn't run at all. */ | |
08036331 | 3245 | if (!cur_thr->control.in_infcall) |
719546c4 | 3246 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3247 | |
1eb8556f SM |
3248 | infrun_debug_printf ("addr=%s, signal=%s", paddress (gdbarch, addr), |
3249 | gdb_signal_to_symbol_string (siggnal)); | |
527159b7 | 3250 | |
4d9d9d04 PA |
3251 | annotate_starting (); |
3252 | ||
3253 | /* Make sure that output from GDB appears before output from the | |
3254 | inferior. */ | |
3255 | gdb_flush (gdb_stdout); | |
3256 | ||
d930703d PA |
3257 | /* Since we've marked the inferior running, give it the terminal. A |
3258 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3259 | still detect attempts to unblock a stuck connection with repeated | |
3260 | Ctrl-C from within target_pass_ctrlc). */ | |
3261 | target_terminal::inferior (); | |
3262 | ||
4d9d9d04 PA |
3263 | /* In a multi-threaded task we may select another thread and |
3264 | then continue or step. | |
3265 | ||
3266 | But if a thread that we're resuming had stopped at a breakpoint, | |
3267 | it will immediately cause another breakpoint stop without any | |
3268 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3269 | we must step over it first. | |
3270 | ||
3271 | Look for threads other than the current (TP) that reported a | |
3272 | breakpoint hit and haven't been resumed yet since. */ | |
3273 | ||
3274 | /* If scheduler locking applies, we can avoid iterating over all | |
3275 | threads. */ | |
08036331 | 3276 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3277 | { |
5b6d1e4f PA |
3278 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3279 | resume_ptid)) | |
08036331 | 3280 | { |
f3f8ece4 PA |
3281 | switch_to_thread_no_regs (tp); |
3282 | ||
4d9d9d04 PA |
3283 | /* Ignore the current thread here. It's handled |
3284 | afterwards. */ | |
08036331 | 3285 | if (tp == cur_thr) |
4d9d9d04 | 3286 | continue; |
c906108c | 3287 | |
4d9d9d04 PA |
3288 | if (!thread_still_needs_step_over (tp)) |
3289 | continue; | |
3290 | ||
3291 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3292 | |
1eb8556f | 3293 | infrun_debug_printf ("need to step-over [%s] first", |
0fab7955 | 3294 | tp->ptid.to_string ().c_str ()); |
99619bea | 3295 | |
28d5518b | 3296 | global_thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3297 | } |
f3f8ece4 PA |
3298 | |
3299 | switch_to_thread (cur_thr); | |
30852783 UW |
3300 | } |
3301 | ||
4d9d9d04 PA |
3302 | /* Enqueue the current thread last, so that we move all other |
3303 | threads over their breakpoints first. */ | |
08036331 | 3304 | if (cur_thr->stepping_over_breakpoint) |
28d5518b | 3305 | global_thread_step_over_chain_enqueue (cur_thr); |
30852783 | 3306 | |
4d9d9d04 PA |
3307 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3308 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3309 | advanced. Must do this before resuming any thread, as in | |
3310 | all-stop/remote, once we resume we can't send any other packet | |
3311 | until the target stops again. */ | |
fc75c28b | 3312 | cur_thr->prev_pc = regcache_read_pc_protected (regcache); |
99619bea | 3313 | |
a9bc57b9 | 3314 | { |
1192f124 | 3315 | scoped_disable_commit_resumed disable_commit_resumed ("proceeding"); |
8bf10e2e | 3316 | bool step_over_started = start_step_over (); |
c906108c | 3317 | |
a9bc57b9 TT |
3318 | if (step_over_info_valid_p ()) |
3319 | { | |
3320 | /* Either this thread started a new in-line step over, or some | |
3321 | other thread was already doing one. In either case, don't | |
3322 | resume anything else until the step-over is finished. */ | |
3323 | } | |
8bf10e2e | 3324 | else if (step_over_started && !target_is_non_stop_p ()) |
a9bc57b9 TT |
3325 | { |
3326 | /* A new displaced stepping sequence was started. In all-stop, | |
3327 | we can't talk to the target anymore until it next stops. */ | |
3328 | } | |
3329 | else if (!non_stop && target_is_non_stop_p ()) | |
3330 | { | |
3ec3145c SM |
3331 | INFRUN_SCOPED_DEBUG_START_END |
3332 | ("resuming threads, all-stop-on-top-of-non-stop"); | |
3333 | ||
a9bc57b9 TT |
3334 | /* In all-stop, but the target is always in non-stop mode. |
3335 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3336 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3337 | resume_ptid)) | |
3338 | { | |
3339 | switch_to_thread_no_regs (tp); | |
3340 | ||
f9fac3c8 SM |
3341 | if (!tp->inf->has_execution ()) |
3342 | { | |
1eb8556f | 3343 | infrun_debug_printf ("[%s] target has no execution", |
0fab7955 | 3344 | tp->ptid.to_string ().c_str ()); |
f9fac3c8 SM |
3345 | continue; |
3346 | } | |
f3f8ece4 | 3347 | |
7846f3aa | 3348 | if (tp->resumed ()) |
f9fac3c8 | 3349 | { |
1eb8556f | 3350 | infrun_debug_printf ("[%s] resumed", |
0fab7955 | 3351 | tp->ptid.to_string ().c_str ()); |
611841bb | 3352 | gdb_assert (tp->executing () || tp->has_pending_waitstatus ()); |
f9fac3c8 SM |
3353 | continue; |
3354 | } | |
fbea99ea | 3355 | |
f9fac3c8 SM |
3356 | if (thread_is_in_step_over_chain (tp)) |
3357 | { | |
1eb8556f | 3358 | infrun_debug_printf ("[%s] needs step-over", |
0fab7955 | 3359 | tp->ptid.to_string ().c_str ()); |
f9fac3c8 SM |
3360 | continue; |
3361 | } | |
fbea99ea | 3362 | |
d8bbae6e SM |
3363 | /* If a thread of that inferior is waiting for a vfork-done |
3364 | (for a detached vfork child to exec or exit), breakpoints are | |
3365 | removed. We must not resume any thread of that inferior, other | |
3366 | than the one waiting for the vfork-done. */ | |
3367 | if (tp->inf->thread_waiting_for_vfork_done != nullptr | |
3368 | && tp != tp->inf->thread_waiting_for_vfork_done) | |
3369 | { | |
3370 | infrun_debug_printf ("[%s] another thread of this inferior is " | |
3371 | "waiting for vfork-done", | |
3372 | tp->ptid.to_string ().c_str ()); | |
3373 | continue; | |
3374 | } | |
3375 | ||
1eb8556f | 3376 | infrun_debug_printf ("resuming %s", |
0fab7955 | 3377 | tp->ptid.to_string ().c_str ()); |
fbea99ea | 3378 | |
f9fac3c8 SM |
3379 | reset_ecs (ecs, tp); |
3380 | switch_to_thread (tp); | |
3381 | keep_going_pass_signal (ecs); | |
3382 | if (!ecs->wait_some_more) | |
3383 | error (_("Command aborted.")); | |
3384 | } | |
a9bc57b9 | 3385 | } |
d8bbae6e SM |
3386 | else if (!cur_thr->resumed () |
3387 | && !thread_is_in_step_over_chain (cur_thr) | |
3388 | /* In non-stop, forbid resuming a thread if some other thread of | |
3389 | that inferior is waiting for a vfork-done event (this means | |
3390 | breakpoints are out for this inferior). */ | |
3391 | && !(non_stop | |
3392 | && cur_thr->inf->thread_waiting_for_vfork_done != nullptr)) | |
a9bc57b9 TT |
3393 | { |
3394 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3395 | reset_ecs (ecs, cur_thr); |
3396 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3397 | keep_going_pass_signal (ecs); |
3398 | if (!ecs->wait_some_more) | |
3399 | error (_("Command aborted.")); | |
3400 | } | |
c906108c | 3401 | |
1192f124 SM |
3402 | disable_commit_resumed.reset_and_commit (); |
3403 | } | |
85ad3aaf | 3404 | |
731f534f | 3405 | finish_state.release (); |
c906108c | 3406 | |
873657b9 PA |
3407 | /* If we've switched threads above, switch back to the previously |
3408 | current thread. We don't want the user to see a different | |
3409 | selected thread. */ | |
3410 | switch_to_thread (cur_thr); | |
3411 | ||
0b333c5e PA |
3412 | /* Tell the event loop to wait for it to stop. If the target |
3413 | supports asynchronous execution, it'll do this from within | |
3414 | target_resume. */ | |
362646f5 | 3415 | if (!target_can_async_p ()) |
0b333c5e | 3416 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3417 | } |
c906108c SS |
3418 | \f |
3419 | ||
3420 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3421 | |
c906108c | 3422 | void |
8621d6a9 | 3423 | start_remote (int from_tty) |
c906108c | 3424 | { |
5b6d1e4f PA |
3425 | inferior *inf = current_inferior (); |
3426 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3427 | |
1777feb0 | 3428 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3429 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3430 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3431 | nothing is returned (instead of just blocking). Because of this, |
3432 | targets expecting an immediate response need to, internally, set | |
3433 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3434 | timeout. */ |
6426a772 JM |
3435 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3436 | differentiate to its caller what the state of the target is after | |
3437 | the initial open has been performed. Here we're assuming that | |
3438 | the target has stopped. It should be possible to eventually have | |
3439 | target_open() return to the caller an indication that the target | |
3440 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3441 | for an async run. */ |
5b6d1e4f | 3442 | wait_for_inferior (inf); |
8621d6a9 DJ |
3443 | |
3444 | /* Now that the inferior has stopped, do any bookkeeping like | |
3445 | loading shared libraries. We want to do this before normal_stop, | |
3446 | so that the displayed frame is up to date. */ | |
a7aba266 | 3447 | post_create_inferior (from_tty); |
8621d6a9 | 3448 | |
6426a772 | 3449 | normal_stop (); |
c906108c SS |
3450 | } |
3451 | ||
3452 | /* Initialize static vars when a new inferior begins. */ | |
3453 | ||
3454 | void | |
96baa820 | 3455 | init_wait_for_inferior (void) |
c906108c SS |
3456 | { |
3457 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3458 | |
c906108c SS |
3459 | breakpoint_init_inferior (inf_starting); |
3460 | ||
70509625 | 3461 | clear_proceed_status (0); |
9f976b41 | 3462 | |
ab1ddbcf | 3463 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3464 | |
842951eb | 3465 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3466 | } |
237fc4c9 | 3467 | |
c906108c | 3468 | \f |
488f131b | 3469 | |
ec9499be | 3470 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3471 | |
568d6575 UW |
3472 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3473 | struct execution_control_state *ecs); | |
3474 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3475 | struct execution_control_state *ecs); | |
4f5d7f63 | 3476 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3477 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3478 | struct frame_info *); |
611c83ae | 3479 | |
bdc36728 | 3480 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3481 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3482 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3483 | static void process_event_stop_test (struct execution_control_state *ecs); |
c4464ade | 3484 | static bool switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3485 | |
252fbfc8 PA |
3486 | /* This function is attached as a "thread_stop_requested" observer. |
3487 | Cleanup local state that assumed the PTID was to be resumed, and | |
3488 | report the stop to the frontend. */ | |
3489 | ||
2c0b251b | 3490 | static void |
252fbfc8 PA |
3491 | infrun_thread_stop_requested (ptid_t ptid) |
3492 | { | |
5b6d1e4f PA |
3493 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3494 | ||
c65d6b55 PA |
3495 | /* PTID was requested to stop. If the thread was already stopped, |
3496 | but the user/frontend doesn't know about that yet (e.g., the | |
3497 | thread had been temporarily paused for some step-over), set up | |
3498 | for reporting the stop now. */ | |
5b6d1e4f | 3499 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3500 | { |
3501 | if (tp->state != THREAD_RUNNING) | |
3502 | continue; | |
611841bb | 3503 | if (tp->executing ()) |
08036331 | 3504 | continue; |
c65d6b55 | 3505 | |
08036331 PA |
3506 | /* Remove matching threads from the step-over queue, so |
3507 | start_step_over doesn't try to resume them | |
3508 | automatically. */ | |
3509 | if (thread_is_in_step_over_chain (tp)) | |
28d5518b | 3510 | global_thread_step_over_chain_remove (tp); |
c65d6b55 | 3511 | |
08036331 PA |
3512 | /* If the thread is stopped, but the user/frontend doesn't |
3513 | know about that yet, queue a pending event, as if the | |
3514 | thread had just stopped now. Unless the thread already had | |
3515 | a pending event. */ | |
1edb66d8 | 3516 | if (!tp->has_pending_waitstatus ()) |
08036331 | 3517 | { |
1edb66d8 | 3518 | target_waitstatus ws; |
183be222 | 3519 | ws.set_stopped (GDB_SIGNAL_0); |
1edb66d8 | 3520 | tp->set_pending_waitstatus (ws); |
08036331 | 3521 | } |
c65d6b55 | 3522 | |
08036331 PA |
3523 | /* Clear the inline-frame state, since we're re-processing the |
3524 | stop. */ | |
5b6d1e4f | 3525 | clear_inline_frame_state (tp); |
c65d6b55 | 3526 | |
08036331 PA |
3527 | /* If this thread was paused because some other thread was |
3528 | doing an inline-step over, let that finish first. Once | |
3529 | that happens, we'll restart all threads and consume pending | |
3530 | stop events then. */ | |
3531 | if (step_over_info_valid_p ()) | |
3532 | continue; | |
3533 | ||
3534 | /* Otherwise we can process the (new) pending event now. Set | |
3535 | it so this pending event is considered by | |
3536 | do_target_wait. */ | |
7846f3aa | 3537 | tp->set_resumed (true); |
08036331 | 3538 | } |
252fbfc8 PA |
3539 | } |
3540 | ||
a07daef3 PA |
3541 | static void |
3542 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3543 | { | |
5b6d1e4f PA |
3544 | if (target_last_proc_target == tp->inf->process_target () |
3545 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3546 | nullify_last_target_wait_ptid (); |
3547 | } | |
3548 | ||
0cbcdb96 PA |
3549 | /* Delete the step resume, single-step and longjmp/exception resume |
3550 | breakpoints of TP. */ | |
4e1c45ea | 3551 | |
0cbcdb96 PA |
3552 | static void |
3553 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3554 | { |
0cbcdb96 PA |
3555 | delete_step_resume_breakpoint (tp); |
3556 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3557 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3558 | } |
3559 | ||
0cbcdb96 PA |
3560 | /* If the target still has execution, call FUNC for each thread that |
3561 | just stopped. In all-stop, that's all the non-exited threads; in | |
3562 | non-stop, that's the current thread, only. */ | |
3563 | ||
3564 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3565 | (struct thread_info *tp); | |
4e1c45ea PA |
3566 | |
3567 | static void | |
0cbcdb96 | 3568 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3569 | { |
55f6301a | 3570 | if (!target_has_execution () || inferior_ptid == null_ptid) |
4e1c45ea PA |
3571 | return; |
3572 | ||
fbea99ea | 3573 | if (target_is_non_stop_p ()) |
4e1c45ea | 3574 | { |
0cbcdb96 PA |
3575 | /* If in non-stop mode, only the current thread stopped. */ |
3576 | func (inferior_thread ()); | |
4e1c45ea PA |
3577 | } |
3578 | else | |
0cbcdb96 | 3579 | { |
0cbcdb96 | 3580 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3581 | for (thread_info *tp : all_non_exited_threads ()) |
3582 | func (tp); | |
0cbcdb96 PA |
3583 | } |
3584 | } | |
3585 | ||
3586 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3587 | the threads that just stopped. */ | |
3588 | ||
3589 | static void | |
3590 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3591 | { | |
3592 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3593 | } |
3594 | ||
3595 | /* Delete the single-step breakpoints of the threads that just | |
3596 | stopped. */ | |
7c16b83e | 3597 | |
34b7e8a6 PA |
3598 | static void |
3599 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3600 | { | |
3601 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3602 | } |
3603 | ||
221e1a37 | 3604 | /* See infrun.h. */ |
223698f8 | 3605 | |
221e1a37 | 3606 | void |
223698f8 | 3607 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
c272a98c | 3608 | const struct target_waitstatus &ws) |
223698f8 | 3609 | { |
17e971f7 SM |
3610 | infrun_debug_printf ("target_wait (%s [%s], status) =", |
3611 | waiton_ptid.to_string ().c_str (), | |
e71daf80 | 3612 | target_pid_to_str (waiton_ptid).c_str ()); |
17e971f7 SM |
3613 | infrun_debug_printf (" %s [%s],", |
3614 | result_ptid.to_string ().c_str (), | |
e71daf80 | 3615 | target_pid_to_str (result_ptid).c_str ()); |
c272a98c | 3616 | infrun_debug_printf (" %s", ws.to_string ().c_str ()); |
223698f8 DE |
3617 | } |
3618 | ||
372316f1 PA |
3619 | /* Select a thread at random, out of those which are resumed and have |
3620 | had events. */ | |
3621 | ||
3622 | static struct thread_info * | |
5b6d1e4f | 3623 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3624 | { |
71a23490 SM |
3625 | process_stratum_target *proc_target = inf->process_target (); |
3626 | thread_info *thread | |
3627 | = proc_target->random_resumed_with_pending_wait_status (inf, waiton_ptid); | |
08036331 | 3628 | |
71a23490 | 3629 | if (thread == nullptr) |
08036331 | 3630 | { |
71a23490 SM |
3631 | infrun_debug_printf ("None found."); |
3632 | return nullptr; | |
3633 | } | |
372316f1 | 3634 | |
0fab7955 | 3635 | infrun_debug_printf ("Found %s.", thread->ptid.to_string ().c_str ()); |
71a23490 SM |
3636 | gdb_assert (thread->resumed ()); |
3637 | gdb_assert (thread->has_pending_waitstatus ()); | |
372316f1 | 3638 | |
71a23490 | 3639 | return thread; |
372316f1 PA |
3640 | } |
3641 | ||
3642 | /* Wrapper for target_wait that first checks whether threads have | |
3643 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3644 | more events. INF is the inferior we're using to call target_wait |
3645 | on. */ | |
372316f1 PA |
3646 | |
3647 | static ptid_t | |
5b6d1e4f | 3648 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
b60cea74 | 3649 | target_waitstatus *status, target_wait_flags options) |
372316f1 | 3650 | { |
372316f1 PA |
3651 | struct thread_info *tp; |
3652 | ||
24ed6739 AB |
3653 | /* We know that we are looking for an event in the target of inferior |
3654 | INF, but we don't know which thread the event might come from. As | |
3655 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3656 | the wait code relies on it - doing so is always a mistake. */ | |
3657 | switch_to_inferior_no_thread (inf); | |
3658 | ||
372316f1 PA |
3659 | /* First check if there is a resumed thread with a wait status |
3660 | pending. */ | |
d7e15655 | 3661 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3662 | { |
5b6d1e4f | 3663 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3664 | } |
3665 | else | |
3666 | { | |
1eb8556f | 3667 | infrun_debug_printf ("Waiting for specific thread %s.", |
0fab7955 | 3668 | ptid.to_string ().c_str ()); |
372316f1 PA |
3669 | |
3670 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3671 | tp = find_thread_ptid (inf, ptid); |
372316f1 | 3672 | gdb_assert (tp != NULL); |
1edb66d8 | 3673 | if (!tp->has_pending_waitstatus ()) |
372316f1 PA |
3674 | tp = NULL; |
3675 | } | |
3676 | ||
3677 | if (tp != NULL | |
1edb66d8 SM |
3678 | && (tp->stop_reason () == TARGET_STOPPED_BY_SW_BREAKPOINT |
3679 | || tp->stop_reason () == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
372316f1 | 3680 | { |
00431a78 | 3681 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3682 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3683 | CORE_ADDR pc; |
3684 | int discard = 0; | |
3685 | ||
3686 | pc = regcache_read_pc (regcache); | |
3687 | ||
1edb66d8 | 3688 | if (pc != tp->stop_pc ()) |
372316f1 | 3689 | { |
1eb8556f | 3690 | infrun_debug_printf ("PC of %s changed. was=%s, now=%s", |
0fab7955 | 3691 | tp->ptid.to_string ().c_str (), |
1edb66d8 | 3692 | paddress (gdbarch, tp->stop_pc ()), |
1eb8556f | 3693 | paddress (gdbarch, pc)); |
372316f1 PA |
3694 | discard = 1; |
3695 | } | |
a01bda52 | 3696 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 | 3697 | { |
1eb8556f | 3698 | infrun_debug_printf ("previous breakpoint of %s, at %s gone", |
0fab7955 | 3699 | tp->ptid.to_string ().c_str (), |
1eb8556f | 3700 | paddress (gdbarch, pc)); |
372316f1 PA |
3701 | |
3702 | discard = 1; | |
3703 | } | |
3704 | ||
3705 | if (discard) | |
3706 | { | |
1eb8556f | 3707 | infrun_debug_printf ("pending event of %s cancelled.", |
0fab7955 | 3708 | tp->ptid.to_string ().c_str ()); |
372316f1 | 3709 | |
1edb66d8 SM |
3710 | tp->clear_pending_waitstatus (); |
3711 | target_waitstatus ws; | |
183be222 | 3712 | ws.set_spurious (); |
1edb66d8 SM |
3713 | tp->set_pending_waitstatus (ws); |
3714 | tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON); | |
372316f1 PA |
3715 | } |
3716 | } | |
3717 | ||
3718 | if (tp != NULL) | |
3719 | { | |
1eb8556f | 3720 | infrun_debug_printf ("Using pending wait status %s for %s.", |
7dca2ea7 | 3721 | tp->pending_waitstatus ().to_string ().c_str (), |
0fab7955 | 3722 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
3723 | |
3724 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3725 | if it was a software breakpoint (and the target doesn't | |
3726 | always adjust the PC itself). */ | |
1edb66d8 | 3727 | if (tp->stop_reason () == TARGET_STOPPED_BY_SW_BREAKPOINT |
372316f1 PA |
3728 | && !target_supports_stopped_by_sw_breakpoint ()) |
3729 | { | |
3730 | struct regcache *regcache; | |
3731 | struct gdbarch *gdbarch; | |
3732 | int decr_pc; | |
3733 | ||
00431a78 | 3734 | regcache = get_thread_regcache (tp); |
ac7936df | 3735 | gdbarch = regcache->arch (); |
372316f1 PA |
3736 | |
3737 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3738 | if (decr_pc != 0) | |
3739 | { | |
3740 | CORE_ADDR pc; | |
3741 | ||
3742 | pc = regcache_read_pc (regcache); | |
3743 | regcache_write_pc (regcache, pc + decr_pc); | |
3744 | } | |
3745 | } | |
3746 | ||
1edb66d8 SM |
3747 | tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON); |
3748 | *status = tp->pending_waitstatus (); | |
3749 | tp->clear_pending_waitstatus (); | |
372316f1 PA |
3750 | |
3751 | /* Wake up the event loop again, until all pending events are | |
3752 | processed. */ | |
3753 | if (target_is_async_p ()) | |
3754 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3755 | return tp->ptid; | |
3756 | } | |
3757 | ||
3758 | /* But if we don't find one, we'll have to wait. */ | |
3759 | ||
d3a07122 SM |
3760 | /* We can't ask a non-async target to do a non-blocking wait, so this will be |
3761 | a blocking wait. */ | |
71247709 | 3762 | if (!target_can_async_p ()) |
d3a07122 SM |
3763 | options &= ~TARGET_WNOHANG; |
3764 | ||
fb85cece | 3765 | return target_wait (ptid, status, options); |
372316f1 PA |
3766 | } |
3767 | ||
5b6d1e4f PA |
3768 | /* Wrapper for target_wait that first checks whether threads have |
3769 | pending statuses to report before actually asking the target for | |
b3e3a4c1 | 3770 | more events. Polls for events from all inferiors/targets. */ |
5b6d1e4f PA |
3771 | |
3772 | static bool | |
ac0d67ed | 3773 | do_target_wait (execution_control_state *ecs, target_wait_flags options) |
5b6d1e4f PA |
3774 | { |
3775 | int num_inferiors = 0; | |
3776 | int random_selector; | |
3777 | ||
b3e3a4c1 SM |
3778 | /* For fairness, we pick the first inferior/target to poll at random |
3779 | out of all inferiors that may report events, and then continue | |
3780 | polling the rest of the inferior list starting from that one in a | |
3781 | circular fashion until the whole list is polled once. */ | |
5b6d1e4f | 3782 | |
ac0d67ed | 3783 | auto inferior_matches = [] (inferior *inf) |
5b6d1e4f | 3784 | { |
ac0d67ed | 3785 | return inf->process_target () != nullptr; |
5b6d1e4f PA |
3786 | }; |
3787 | ||
b3e3a4c1 | 3788 | /* First see how many matching inferiors we have. */ |
5b6d1e4f PA |
3789 | for (inferior *inf : all_inferiors ()) |
3790 | if (inferior_matches (inf)) | |
3791 | num_inferiors++; | |
3792 | ||
3793 | if (num_inferiors == 0) | |
3794 | { | |
183be222 | 3795 | ecs->ws.set_ignore (); |
5b6d1e4f PA |
3796 | return false; |
3797 | } | |
3798 | ||
b3e3a4c1 | 3799 | /* Now randomly pick an inferior out of those that matched. */ |
5b6d1e4f PA |
3800 | random_selector = (int) |
3801 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3802 | ||
1eb8556f SM |
3803 | if (num_inferiors > 1) |
3804 | infrun_debug_printf ("Found %d inferiors, starting at #%d", | |
3805 | num_inferiors, random_selector); | |
5b6d1e4f | 3806 | |
b3e3a4c1 | 3807 | /* Select the Nth inferior that matched. */ |
5b6d1e4f PA |
3808 | |
3809 | inferior *selected = nullptr; | |
3810 | ||
3811 | for (inferior *inf : all_inferiors ()) | |
3812 | if (inferior_matches (inf)) | |
3813 | if (random_selector-- == 0) | |
3814 | { | |
3815 | selected = inf; | |
3816 | break; | |
3817 | } | |
3818 | ||
b3e3a4c1 | 3819 | /* Now poll for events out of each of the matching inferior's |
5b6d1e4f PA |
3820 | targets, starting from the selected one. */ |
3821 | ||
3822 | auto do_wait = [&] (inferior *inf) | |
3823 | { | |
ac0d67ed | 3824 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, options); |
5b6d1e4f | 3825 | ecs->target = inf->process_target (); |
183be222 | 3826 | return (ecs->ws.kind () != TARGET_WAITKIND_IGNORE); |
5b6d1e4f PA |
3827 | }; |
3828 | ||
b3e3a4c1 SM |
3829 | /* Needed in 'all-stop + target-non-stop' mode, because we end up |
3830 | here spuriously after the target is all stopped and we've already | |
5b6d1e4f PA |
3831 | reported the stop to the user, polling for events. */ |
3832 | scoped_restore_current_thread restore_thread; | |
3833 | ||
08bdefb5 PA |
3834 | intrusive_list_iterator<inferior> start |
3835 | = inferior_list.iterator_to (*selected); | |
3836 | ||
3837 | for (intrusive_list_iterator<inferior> it = start; | |
3838 | it != inferior_list.end (); | |
3839 | ++it) | |
3840 | { | |
3841 | inferior *inf = &*it; | |
3842 | ||
3843 | if (inferior_matches (inf) && do_wait (inf)) | |
5b6d1e4f | 3844 | return true; |
08bdefb5 | 3845 | } |
5b6d1e4f | 3846 | |
08bdefb5 PA |
3847 | for (intrusive_list_iterator<inferior> it = inferior_list.begin (); |
3848 | it != start; | |
3849 | ++it) | |
3850 | { | |
3851 | inferior *inf = &*it; | |
3852 | ||
3853 | if (inferior_matches (inf) && do_wait (inf)) | |
5b6d1e4f | 3854 | return true; |
08bdefb5 | 3855 | } |
5b6d1e4f | 3856 | |
183be222 | 3857 | ecs->ws.set_ignore (); |
5b6d1e4f PA |
3858 | return false; |
3859 | } | |
3860 | ||
8ff53139 PA |
3861 | /* An event reported by wait_one. */ |
3862 | ||
3863 | struct wait_one_event | |
3864 | { | |
3865 | /* The target the event came out of. */ | |
3866 | process_stratum_target *target; | |
3867 | ||
3868 | /* The PTID the event was for. */ | |
3869 | ptid_t ptid; | |
3870 | ||
3871 | /* The waitstatus. */ | |
3872 | target_waitstatus ws; | |
3873 | }; | |
3874 | ||
3875 | static bool handle_one (const wait_one_event &event); | |
3876 | ||
24291992 PA |
3877 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3878 | detaching while a thread is displaced stepping is a recipe for | |
3879 | crashing it, as nothing would readjust the PC out of the scratch | |
3880 | pad. */ | |
3881 | ||
3882 | void | |
3883 | prepare_for_detach (void) | |
3884 | { | |
3885 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3886 | ptid_t pid_ptid = ptid_t (inf->pid); |
8ff53139 | 3887 | scoped_restore_current_thread restore_thread; |
24291992 | 3888 | |
9bcb1f16 | 3889 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3890 | |
8ff53139 PA |
3891 | /* Remove all threads of INF from the global step-over chain. We |
3892 | want to stop any ongoing step-over, not start any new one. */ | |
8b6a69b2 SM |
3893 | thread_step_over_list_safe_range range |
3894 | = make_thread_step_over_list_safe_range (global_thread_step_over_list); | |
3895 | ||
3896 | for (thread_info *tp : range) | |
3897 | if (tp->inf == inf) | |
3898 | { | |
3899 | infrun_debug_printf ("removing thread %s from global step over chain", | |
0fab7955 | 3900 | tp->ptid.to_string ().c_str ()); |
8ff53139 | 3901 | global_thread_step_over_chain_remove (tp); |
8b6a69b2 | 3902 | } |
24291992 | 3903 | |
ac7d717c PA |
3904 | /* If we were already in the middle of an inline step-over, and the |
3905 | thread stepping belongs to the inferior we're detaching, we need | |
3906 | to restart the threads of other inferiors. */ | |
3907 | if (step_over_info.thread != -1) | |
3908 | { | |
3909 | infrun_debug_printf ("inline step-over in-process while detaching"); | |
3910 | ||
3911 | thread_info *thr = find_thread_global_id (step_over_info.thread); | |
3912 | if (thr->inf == inf) | |
3913 | { | |
3914 | /* Since we removed threads of INF from the step-over chain, | |
3915 | we know this won't start a step-over for INF. */ | |
3916 | clear_step_over_info (); | |
3917 | ||
3918 | if (target_is_non_stop_p ()) | |
3919 | { | |
3920 | /* Start a new step-over in another thread if there's | |
3921 | one that needs it. */ | |
3922 | start_step_over (); | |
3923 | ||
3924 | /* Restart all other threads (except the | |
3925 | previously-stepping thread, since that one is still | |
3926 | running). */ | |
3927 | if (!step_over_info_valid_p ()) | |
3928 | restart_threads (thr); | |
3929 | } | |
3930 | } | |
3931 | } | |
3932 | ||
8ff53139 PA |
3933 | if (displaced_step_in_progress (inf)) |
3934 | { | |
3935 | infrun_debug_printf ("displaced-stepping in-process while detaching"); | |
24291992 | 3936 | |
8ff53139 | 3937 | /* Stop threads currently displaced stepping, aborting it. */ |
24291992 | 3938 | |
8ff53139 PA |
3939 | for (thread_info *thr : inf->non_exited_threads ()) |
3940 | { | |
3941 | if (thr->displaced_step_state.in_progress ()) | |
3942 | { | |
611841bb | 3943 | if (thr->executing ()) |
8ff53139 PA |
3944 | { |
3945 | if (!thr->stop_requested) | |
3946 | { | |
3947 | target_stop (thr->ptid); | |
3948 | thr->stop_requested = true; | |
3949 | } | |
3950 | } | |
3951 | else | |
7846f3aa | 3952 | thr->set_resumed (false); |
8ff53139 PA |
3953 | } |
3954 | } | |
24291992 | 3955 | |
8ff53139 PA |
3956 | while (displaced_step_in_progress (inf)) |
3957 | { | |
3958 | wait_one_event event; | |
24291992 | 3959 | |
8ff53139 PA |
3960 | event.target = inf->process_target (); |
3961 | event.ptid = do_target_wait_1 (inf, pid_ptid, &event.ws, 0); | |
24291992 | 3962 | |
8ff53139 | 3963 | if (debug_infrun) |
c272a98c | 3964 | print_target_wait_results (pid_ptid, event.ptid, event.ws); |
24291992 | 3965 | |
8ff53139 PA |
3966 | handle_one (event); |
3967 | } | |
24291992 | 3968 | |
8ff53139 PA |
3969 | /* It's OK to leave some of the threads of INF stopped, since |
3970 | they'll be detached shortly. */ | |
24291992 | 3971 | } |
24291992 PA |
3972 | } |
3973 | ||
cd0fc7c3 | 3974 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3975 | |
cd0fc7c3 SS |
3976 | If inferior gets a signal, we may decide to start it up again |
3977 | instead of returning. That is why there is a loop in this function. | |
3978 | When this function actually returns it means the inferior | |
3979 | should be left stopped and GDB should read more commands. */ | |
3980 | ||
5b6d1e4f PA |
3981 | static void |
3982 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3983 | { |
1eb8556f | 3984 | infrun_debug_printf ("wait_for_inferior ()"); |
527159b7 | 3985 | |
4c41382a | 3986 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3987 | |
e6f5c25b PA |
3988 | /* If an error happens while handling the event, propagate GDB's |
3989 | knowledge of the executing state to the frontend/user running | |
3990 | state. */ | |
5b6d1e4f PA |
3991 | scoped_finish_thread_state finish_state |
3992 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 3993 | |
c906108c SS |
3994 | while (1) |
3995 | { | |
ae25568b PA |
3996 | struct execution_control_state ecss; |
3997 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 3998 | |
ec9499be | 3999 | overlay_cache_invalid = 1; |
ec9499be | 4000 | |
f15cb84a YQ |
4001 | /* Flush target cache before starting to handle each event. |
4002 | Target was running and cache could be stale. This is just a | |
4003 | heuristic. Running threads may modify target memory, but we | |
4004 | don't get any event. */ | |
4005 | target_dcache_invalidate (); | |
4006 | ||
5b6d1e4f PA |
4007 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
4008 | ecs->target = inf->process_target (); | |
c906108c | 4009 | |
f00150c9 | 4010 | if (debug_infrun) |
c272a98c | 4011 | print_target_wait_results (minus_one_ptid, ecs->ptid, ecs->ws); |
f00150c9 | 4012 | |
cd0fc7c3 SS |
4013 | /* Now figure out what to do with the result of the result. */ |
4014 | handle_inferior_event (ecs); | |
c906108c | 4015 | |
cd0fc7c3 SS |
4016 | if (!ecs->wait_some_more) |
4017 | break; | |
4018 | } | |
4e1c45ea | 4019 | |
e6f5c25b | 4020 | /* No error, don't finish the state yet. */ |
731f534f | 4021 | finish_state.release (); |
cd0fc7c3 | 4022 | } |
c906108c | 4023 | |
d3d4baed PA |
4024 | /* Cleanup that reinstalls the readline callback handler, if the |
4025 | target is running in the background. If while handling the target | |
4026 | event something triggered a secondary prompt, like e.g., a | |
4027 | pagination prompt, we'll have removed the callback handler (see | |
4028 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
4029 | event loop, ready to process further input. Note this has no | |
4030 | effect if the handler hasn't actually been removed, because calling | |
4031 | rl_callback_handler_install resets the line buffer, thus losing | |
4032 | input. */ | |
4033 | ||
4034 | static void | |
d238133d | 4035 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 4036 | { |
3b12939d PA |
4037 | struct ui *ui = current_ui; |
4038 | ||
4039 | if (!ui->async) | |
6c400b59 PA |
4040 | { |
4041 | /* We're not going back to the top level event loop yet. Don't | |
4042 | install the readline callback, as it'd prep the terminal, | |
4043 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
4044 | it the next time the prompt is displayed, when we're ready | |
4045 | for input. */ | |
4046 | return; | |
4047 | } | |
4048 | ||
3b12939d | 4049 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
4050 | gdb_rl_callback_handler_reinstall (); |
4051 | } | |
4052 | ||
243a9253 PA |
4053 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
4054 | that's just the event thread. In all-stop, that's all threads. */ | |
4055 | ||
4056 | static void | |
4057 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
4058 | { | |
573269a8 LS |
4059 | if (ecs->event_thread != nullptr |
4060 | && ecs->event_thread->thread_fsm () != nullptr) | |
4061 | ecs->event_thread->thread_fsm ()->clean_up (ecs->event_thread); | |
243a9253 PA |
4062 | |
4063 | if (!non_stop) | |
4064 | { | |
08036331 | 4065 | for (thread_info *thr : all_non_exited_threads ()) |
dda83cd7 | 4066 | { |
573269a8 | 4067 | if (thr->thread_fsm () == nullptr) |
243a9253 PA |
4068 | continue; |
4069 | if (thr == ecs->event_thread) | |
4070 | continue; | |
4071 | ||
00431a78 | 4072 | switch_to_thread (thr); |
573269a8 | 4073 | thr->thread_fsm ()->clean_up (thr); |
243a9253 PA |
4074 | } |
4075 | ||
573269a8 | 4076 | if (ecs->event_thread != nullptr) |
00431a78 | 4077 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
4078 | } |
4079 | } | |
4080 | ||
3b12939d PA |
4081 | /* Helper for all_uis_check_sync_execution_done that works on the |
4082 | current UI. */ | |
4083 | ||
4084 | static void | |
4085 | check_curr_ui_sync_execution_done (void) | |
4086 | { | |
4087 | struct ui *ui = current_ui; | |
4088 | ||
4089 | if (ui->prompt_state == PROMPT_NEEDED | |
4090 | && ui->async | |
4091 | && !gdb_in_secondary_prompt_p (ui)) | |
4092 | { | |
223ffa71 | 4093 | target_terminal::ours (); |
76727919 | 4094 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 4095 | ui_register_input_event_handler (ui); |
3b12939d PA |
4096 | } |
4097 | } | |
4098 | ||
4099 | /* See infrun.h. */ | |
4100 | ||
4101 | void | |
4102 | all_uis_check_sync_execution_done (void) | |
4103 | { | |
0e454242 | 4104 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
4105 | { |
4106 | check_curr_ui_sync_execution_done (); | |
4107 | } | |
4108 | } | |
4109 | ||
a8836c93 PA |
4110 | /* See infrun.h. */ |
4111 | ||
4112 | void | |
4113 | all_uis_on_sync_execution_starting (void) | |
4114 | { | |
0e454242 | 4115 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
4116 | { |
4117 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
4118 | async_disable_stdin (); | |
4119 | } | |
4120 | } | |
4121 | ||
1777feb0 | 4122 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 4123 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
4124 | descriptor corresponding to the target. It can be called more than |
4125 | once to complete a single execution command. In such cases we need | |
4126 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
4127 | that this function is called for a single execution command, then |
4128 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 4129 | necessary cleanups. */ |
43ff13b4 JM |
4130 | |
4131 | void | |
b1a35af2 | 4132 | fetch_inferior_event () |
43ff13b4 | 4133 | { |
3ec3145c SM |
4134 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
4135 | ||
0d1e5fa7 | 4136 | struct execution_control_state ecss; |
a474d7c2 | 4137 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 4138 | int cmd_done = 0; |
43ff13b4 | 4139 | |
c61db772 PA |
4140 | /* Events are always processed with the main UI as current UI. This |
4141 | way, warnings, debug output, etc. are always consistently sent to | |
4142 | the main console. */ | |
4b6749b9 | 4143 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 4144 | |
b78b3a29 TBA |
4145 | /* Temporarily disable pagination. Otherwise, the user would be |
4146 | given an option to press 'q' to quit, which would cause an early | |
4147 | exit and could leave GDB in a half-baked state. */ | |
4148 | scoped_restore save_pagination | |
4149 | = make_scoped_restore (&pagination_enabled, false); | |
4150 | ||
d3d4baed | 4151 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
4152 | { |
4153 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
4154 | ||
4155 | /* We're handling a live event, so make sure we're doing live | |
4156 | debugging. If we're looking at traceframes while the target is | |
4157 | running, we're going to need to get back to that mode after | |
4158 | handling the event. */ | |
4159 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
4160 | if (non_stop) | |
4161 | { | |
4162 | maybe_restore_traceframe.emplace (); | |
4163 | set_current_traceframe (-1); | |
4164 | } | |
43ff13b4 | 4165 | |
873657b9 PA |
4166 | /* The user/frontend should not notice a thread switch due to |
4167 | internal events. Make sure we revert to the user selected | |
4168 | thread and frame after handling the event and running any | |
4169 | breakpoint commands. */ | |
4170 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
4171 | |
4172 | overlay_cache_invalid = 1; | |
4173 | /* Flush target cache before starting to handle each event. Target | |
4174 | was running and cache could be stale. This is just a heuristic. | |
4175 | Running threads may modify target memory, but we don't get any | |
4176 | event. */ | |
4177 | target_dcache_invalidate (); | |
4178 | ||
4179 | scoped_restore save_exec_dir | |
4180 | = make_scoped_restore (&execution_direction, | |
4181 | target_execution_direction ()); | |
4182 | ||
1192f124 SM |
4183 | /* Allow targets to pause their resumed threads while we handle |
4184 | the event. */ | |
4185 | scoped_disable_commit_resumed disable_commit_resumed ("handling event"); | |
4186 | ||
ac0d67ed | 4187 | if (!do_target_wait (ecs, TARGET_WNOHANG)) |
1192f124 SM |
4188 | { |
4189 | infrun_debug_printf ("do_target_wait returned no event"); | |
4190 | disable_commit_resumed.reset_and_commit (); | |
4191 | return; | |
4192 | } | |
5b6d1e4f | 4193 | |
183be222 | 4194 | gdb_assert (ecs->ws.kind () != TARGET_WAITKIND_IGNORE); |
5b6d1e4f PA |
4195 | |
4196 | /* Switch to the target that generated the event, so we can do | |
7f08fd51 TBA |
4197 | target calls. */ |
4198 | switch_to_target_no_thread (ecs->target); | |
d238133d TT |
4199 | |
4200 | if (debug_infrun) | |
c272a98c | 4201 | print_target_wait_results (minus_one_ptid, ecs->ptid, ecs->ws); |
d238133d TT |
4202 | |
4203 | /* If an error happens while handling the event, propagate GDB's | |
4204 | knowledge of the executing state to the frontend/user running | |
4205 | state. */ | |
4206 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 4207 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 4208 | |
979a0d13 | 4209 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
4210 | still for the thread which has thrown the exception. */ |
4211 | auto defer_bpstat_clear | |
4212 | = make_scope_exit (bpstat_clear_actions); | |
4213 | auto defer_delete_threads | |
4214 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
4215 | ||
4216 | /* Now figure out what to do with the result of the result. */ | |
4217 | handle_inferior_event (ecs); | |
4218 | ||
4219 | if (!ecs->wait_some_more) | |
4220 | { | |
5b6d1e4f | 4221 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
758cb810 | 4222 | bool should_stop = true; |
d238133d | 4223 | struct thread_info *thr = ecs->event_thread; |
d6b48e9c | 4224 | |
d238133d | 4225 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 4226 | |
573269a8 LS |
4227 | if (thr != nullptr && thr->thread_fsm () != nullptr) |
4228 | should_stop = thr->thread_fsm ()->should_stop (thr); | |
243a9253 | 4229 | |
d238133d TT |
4230 | if (!should_stop) |
4231 | { | |
4232 | keep_going (ecs); | |
4233 | } | |
4234 | else | |
4235 | { | |
46e3ed7f | 4236 | bool should_notify_stop = true; |
d238133d | 4237 | int proceeded = 0; |
1840d81a | 4238 | |
d238133d | 4239 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 4240 | |
573269a8 LS |
4241 | if (thr != nullptr && thr->thread_fsm () != nullptr) |
4242 | should_notify_stop | |
4243 | = thr->thread_fsm ()->should_notify_stop (); | |
388a7084 | 4244 | |
d238133d TT |
4245 | if (should_notify_stop) |
4246 | { | |
4247 | /* We may not find an inferior if this was a process exit. */ | |
4248 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
4249 | proceeded = normal_stop (); | |
4250 | } | |
243a9253 | 4251 | |
d238133d TT |
4252 | if (!proceeded) |
4253 | { | |
b1a35af2 | 4254 | inferior_event_handler (INF_EXEC_COMPLETE); |
d238133d TT |
4255 | cmd_done = 1; |
4256 | } | |
873657b9 PA |
4257 | |
4258 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
4259 | previously selected thread is gone. We have two | |
4260 | choices - switch to no thread selected, or restore the | |
4261 | previously selected thread (now exited). We chose the | |
4262 | later, just because that's what GDB used to do. After | |
4263 | this, "info threads" says "The current thread <Thread | |
4264 | ID 2> has terminated." instead of "No thread | |
4265 | selected.". */ | |
4266 | if (!non_stop | |
4267 | && cmd_done | |
183be222 | 4268 | && ecs->ws.kind () != TARGET_WAITKIND_NO_RESUMED) |
873657b9 | 4269 | restore_thread.dont_restore (); |
d238133d TT |
4270 | } |
4271 | } | |
4f8d22e3 | 4272 | |
d238133d TT |
4273 | defer_delete_threads.release (); |
4274 | defer_bpstat_clear.release (); | |
29f49a6a | 4275 | |
d238133d TT |
4276 | /* No error, don't finish the thread states yet. */ |
4277 | finish_state.release (); | |
731f534f | 4278 | |
1192f124 SM |
4279 | disable_commit_resumed.reset_and_commit (); |
4280 | ||
d238133d TT |
4281 | /* This scope is used to ensure that readline callbacks are |
4282 | reinstalled here. */ | |
4283 | } | |
4f8d22e3 | 4284 | |
152a1749 SM |
4285 | /* Handling this event might have caused some inferiors to become prunable. |
4286 | For example, the exit of an inferior that was automatically added. Try | |
4287 | to get rid of them. Keeping those around slows down things linearly. | |
4288 | ||
4289 | Note that this never removes the current inferior. Therefore, call this | |
4290 | after RESTORE_THREAD went out of scope, in case the event inferior (which was | |
4291 | temporarily made the current inferior) is meant to be deleted. | |
4292 | ||
4293 | Call this before all_uis_check_sync_execution_done, so that notifications about | |
4294 | removed inferiors appear before the prompt. */ | |
4295 | prune_inferiors (); | |
4296 | ||
3b12939d PA |
4297 | /* If a UI was in sync execution mode, and now isn't, restore its |
4298 | prompt (a synchronous execution command has finished, and we're | |
4299 | ready for input). */ | |
4300 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4301 | |
4302 | if (cmd_done | |
0f641c01 | 4303 | && exec_done_display_p |
00431a78 PA |
4304 | && (inferior_ptid == null_ptid |
4305 | || inferior_thread ()->state != THREAD_RUNNING)) | |
6cb06a8c | 4306 | gdb_printf (_("completed.\n")); |
43ff13b4 JM |
4307 | } |
4308 | ||
29734269 SM |
4309 | /* See infrun.h. */ |
4310 | ||
edb3359d | 4311 | void |
29734269 SM |
4312 | set_step_info (thread_info *tp, struct frame_info *frame, |
4313 | struct symtab_and_line sal) | |
edb3359d | 4314 | { |
29734269 SM |
4315 | /* This can be removed once this function no longer implicitly relies on the |
4316 | inferior_ptid value. */ | |
4317 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4318 | |
16c381f0 JK |
4319 | tp->control.step_frame_id = get_frame_id (frame); |
4320 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4321 | |
4322 | tp->current_symtab = sal.symtab; | |
4323 | tp->current_line = sal.line; | |
c8353d68 AB |
4324 | |
4325 | infrun_debug_printf | |
4326 | ("symtab = %s, line = %d, step_frame_id = %s, step_stack_frame_id = %s", | |
b7e07722 PA |
4327 | tp->current_symtab != nullptr ? tp->current_symtab->filename : "<null>", |
4328 | tp->current_line, | |
c8353d68 AB |
4329 | tp->control.step_frame_id.to_string ().c_str (), |
4330 | tp->control.step_stack_frame_id.to_string ().c_str ()); | |
edb3359d DJ |
4331 | } |
4332 | ||
0d1e5fa7 PA |
4333 | /* Clear context switchable stepping state. */ |
4334 | ||
4335 | void | |
4e1c45ea | 4336 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4337 | { |
7f5ef605 | 4338 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4339 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4340 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4341 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4342 | } |
4343 | ||
ab1ddbcf | 4344 | /* See infrun.h. */ |
c32c64b7 | 4345 | |
6efcd9a8 | 4346 | void |
5b6d1e4f | 4347 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
183be222 | 4348 | const target_waitstatus &status) |
c32c64b7 | 4349 | { |
5b6d1e4f | 4350 | target_last_proc_target = target; |
c32c64b7 DE |
4351 | target_last_wait_ptid = ptid; |
4352 | target_last_waitstatus = status; | |
4353 | } | |
4354 | ||
ab1ddbcf | 4355 | /* See infrun.h. */ |
e02bc4cc DS |
4356 | |
4357 | void | |
5b6d1e4f PA |
4358 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4359 | target_waitstatus *status) | |
e02bc4cc | 4360 | { |
5b6d1e4f PA |
4361 | if (target != nullptr) |
4362 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4363 | if (ptid != nullptr) |
4364 | *ptid = target_last_wait_ptid; | |
4365 | if (status != nullptr) | |
4366 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4367 | } |
4368 | ||
ab1ddbcf PA |
4369 | /* See infrun.h. */ |
4370 | ||
ac264b3b MS |
4371 | void |
4372 | nullify_last_target_wait_ptid (void) | |
4373 | { | |
5b6d1e4f | 4374 | target_last_proc_target = nullptr; |
ac264b3b | 4375 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4376 | target_last_waitstatus = {}; |
ac264b3b MS |
4377 | } |
4378 | ||
dcf4fbde | 4379 | /* Switch thread contexts. */ |
dd80620e MS |
4380 | |
4381 | static void | |
00431a78 | 4382 | context_switch (execution_control_state *ecs) |
dd80620e | 4383 | { |
1eb8556f | 4384 | if (ecs->ptid != inferior_ptid |
5b6d1e4f PA |
4385 | && (inferior_ptid == null_ptid |
4386 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 | 4387 | { |
1eb8556f | 4388 | infrun_debug_printf ("Switching context from %s to %s", |
0fab7955 SM |
4389 | inferior_ptid.to_string ().c_str (), |
4390 | ecs->ptid.to_string ().c_str ()); | |
fd48f117 DJ |
4391 | } |
4392 | ||
00431a78 | 4393 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4394 | } |
4395 | ||
d8dd4d5f PA |
4396 | /* If the target can't tell whether we've hit breakpoints |
4397 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4398 | check whether that could have been caused by a breakpoint. If so, | |
4399 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4400 | ||
4fa8626c | 4401 | static void |
d8dd4d5f | 4402 | adjust_pc_after_break (struct thread_info *thread, |
c272a98c | 4403 | const target_waitstatus &ws) |
4fa8626c | 4404 | { |
24a73cce UW |
4405 | struct regcache *regcache; |
4406 | struct gdbarch *gdbarch; | |
118e6252 | 4407 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4408 | |
4fa8626c DJ |
4409 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4410 | we aren't, just return. | |
9709f61c DJ |
4411 | |
4412 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4413 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4414 | implemented by software breakpoints should be handled through the normal | |
4415 | breakpoint layer. | |
8fb3e588 | 4416 | |
4fa8626c DJ |
4417 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4418 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4419 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4420 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4421 | generates these signals at breakpoints (the code has been in GDB since at | |
4422 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4423 | |
e6cf7916 UW |
4424 | In earlier versions of GDB, a target with |
4425 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4426 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4427 | target with both of these set in GDB history, and it seems unlikely to be | |
4428 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4429 | |
c272a98c | 4430 | if (ws.kind () != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4431 | return; |
4432 | ||
c272a98c | 4433 | if (ws.sig () != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4434 | return; |
4435 | ||
4058b839 PA |
4436 | /* In reverse execution, when a breakpoint is hit, the instruction |
4437 | under it has already been de-executed. The reported PC always | |
4438 | points at the breakpoint address, so adjusting it further would | |
4439 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4440 | architecture: | |
4441 | ||
4442 | B1 0x08000000 : INSN1 | |
4443 | B2 0x08000001 : INSN2 | |
4444 | 0x08000002 : INSN3 | |
4445 | PC -> 0x08000003 : INSN4 | |
4446 | ||
4447 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4448 | from that point should hit B2 as below. Reading the PC when the | |
4449 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4450 | been de-executed already. | |
4451 | ||
4452 | B1 0x08000000 : INSN1 | |
4453 | B2 PC -> 0x08000001 : INSN2 | |
4454 | 0x08000002 : INSN3 | |
4455 | 0x08000003 : INSN4 | |
4456 | ||
4457 | We can't apply the same logic as for forward execution, because | |
4458 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4459 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4460 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4461 | behaviour. */ | |
4462 | if (execution_direction == EXEC_REVERSE) | |
4463 | return; | |
4464 | ||
1cf4d951 PA |
4465 | /* If the target can tell whether the thread hit a SW breakpoint, |
4466 | trust it. Targets that can tell also adjust the PC | |
4467 | themselves. */ | |
4468 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4469 | return; | |
4470 | ||
4471 | /* Note that relying on whether a breakpoint is planted in memory to | |
4472 | determine this can fail. E.g,. the breakpoint could have been | |
4473 | removed since. Or the thread could have been told to step an | |
4474 | instruction the size of a breakpoint instruction, and only | |
4475 | _after_ was a breakpoint inserted at its address. */ | |
4476 | ||
24a73cce UW |
4477 | /* If this target does not decrement the PC after breakpoints, then |
4478 | we have nothing to do. */ | |
00431a78 | 4479 | regcache = get_thread_regcache (thread); |
ac7936df | 4480 | gdbarch = regcache->arch (); |
118e6252 | 4481 | |
527a273a | 4482 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4483 | if (decr_pc == 0) |
24a73cce UW |
4484 | return; |
4485 | ||
8b86c959 | 4486 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4487 | |
8aad930b AC |
4488 | /* Find the location where (if we've hit a breakpoint) the |
4489 | breakpoint would be. */ | |
118e6252 | 4490 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4491 | |
1cf4d951 PA |
4492 | /* If the target can't tell whether a software breakpoint triggered, |
4493 | fallback to figuring it out based on breakpoints we think were | |
4494 | inserted in the target, and on whether the thread was stepped or | |
4495 | continued. */ | |
4496 | ||
1c5cfe86 PA |
4497 | /* Check whether there actually is a software breakpoint inserted at |
4498 | that location. | |
4499 | ||
4500 | If in non-stop mode, a race condition is possible where we've | |
4501 | removed a breakpoint, but stop events for that breakpoint were | |
4502 | already queued and arrive later. To suppress those spurious | |
4503 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4504 | and retire them after a number of stop events are reported. Note |
4505 | this is an heuristic and can thus get confused. The real fix is | |
4506 | to get the "stopped by SW BP and needs adjustment" info out of | |
4507 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4508 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4509 | || (target_is_non_stop_p () |
4510 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4511 | { |
07036511 | 4512 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4513 | |
8213266a | 4514 | if (record_full_is_used ()) |
07036511 TT |
4515 | restore_operation_disable.emplace |
4516 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4517 | |
1c0fdd0e UW |
4518 | /* When using hardware single-step, a SIGTRAP is reported for both |
4519 | a completed single-step and a software breakpoint. Need to | |
4520 | differentiate between the two, as the latter needs adjusting | |
4521 | but the former does not. | |
4522 | ||
4523 | The SIGTRAP can be due to a completed hardware single-step only if | |
4524 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4525 | - this thread is currently being stepped |
4526 | ||
4527 | If any of these events did not occur, we must have stopped due | |
4528 | to hitting a software breakpoint, and have to back up to the | |
4529 | breakpoint address. | |
4530 | ||
4531 | As a special case, we could have hardware single-stepped a | |
4532 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4533 | we also need to back up to the breakpoint address. */ | |
4534 | ||
d8dd4d5f PA |
4535 | if (thread_has_single_step_breakpoints_set (thread) |
4536 | || !currently_stepping (thread) | |
4537 | || (thread->stepped_breakpoint | |
4538 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4539 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4540 | } |
4fa8626c DJ |
4541 | } |
4542 | ||
c4464ade | 4543 | static bool |
edb3359d DJ |
4544 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) |
4545 | { | |
4546 | for (frame = get_prev_frame (frame); | |
4547 | frame != NULL; | |
4548 | frame = get_prev_frame (frame)) | |
4549 | { | |
4550 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
c4464ade SM |
4551 | return true; |
4552 | ||
edb3359d DJ |
4553 | if (get_frame_type (frame) != INLINE_FRAME) |
4554 | break; | |
4555 | } | |
4556 | ||
c4464ade | 4557 | return false; |
edb3359d DJ |
4558 | } |
4559 | ||
4a4c04f1 BE |
4560 | /* Look for an inline frame that is marked for skip. |
4561 | If PREV_FRAME is TRUE start at the previous frame, | |
4562 | otherwise start at the current frame. Stop at the | |
4563 | first non-inline frame, or at the frame where the | |
4564 | step started. */ | |
4565 | ||
4566 | static bool | |
4567 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4568 | { | |
4569 | struct frame_info *frame = get_current_frame (); | |
4570 | ||
4571 | if (prev_frame) | |
4572 | frame = get_prev_frame (frame); | |
4573 | ||
4574 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4575 | { | |
4576 | const char *fn = NULL; | |
4577 | symtab_and_line sal; | |
4578 | struct symbol *sym; | |
4579 | ||
4580 | if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id)) | |
4581 | break; | |
4582 | if (get_frame_type (frame) != INLINE_FRAME) | |
4583 | break; | |
4584 | ||
4585 | sal = find_frame_sal (frame); | |
4586 | sym = get_frame_function (frame); | |
4587 | ||
4588 | if (sym != NULL) | |
4589 | fn = sym->print_name (); | |
4590 | ||
4591 | if (sal.line != 0 | |
4592 | && function_name_is_marked_for_skip (fn, sal)) | |
4593 | return true; | |
4594 | } | |
4595 | ||
4596 | return false; | |
4597 | } | |
4598 | ||
c65d6b55 PA |
4599 | /* If the event thread has the stop requested flag set, pretend it |
4600 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4601 | target_stop). */ | |
4602 | ||
4603 | static bool | |
4604 | handle_stop_requested (struct execution_control_state *ecs) | |
4605 | { | |
4606 | if (ecs->event_thread->stop_requested) | |
4607 | { | |
183be222 | 4608 | ecs->ws.set_stopped (GDB_SIGNAL_0); |
c65d6b55 PA |
4609 | handle_signal_stop (ecs); |
4610 | return true; | |
4611 | } | |
4612 | return false; | |
4613 | } | |
4614 | ||
a96d9b2e | 4615 | /* Auxiliary function that handles syscall entry/return events. |
c4464ade SM |
4616 | It returns true if the inferior should keep going (and GDB |
4617 | should ignore the event), or false if the event deserves to be | |
a96d9b2e | 4618 | processed. */ |
ca2163eb | 4619 | |
c4464ade | 4620 | static bool |
ca2163eb | 4621 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4622 | { |
ca2163eb | 4623 | struct regcache *regcache; |
ca2163eb PA |
4624 | int syscall_number; |
4625 | ||
00431a78 | 4626 | context_switch (ecs); |
ca2163eb | 4627 | |
00431a78 | 4628 | regcache = get_thread_regcache (ecs->event_thread); |
183be222 | 4629 | syscall_number = ecs->ws.syscall_number (); |
1edb66d8 | 4630 | ecs->event_thread->set_stop_pc (regcache_read_pc (regcache)); |
ca2163eb | 4631 | |
a96d9b2e | 4632 | if (catch_syscall_enabled () > 0 |
9fe3819e | 4633 | && catching_syscall_number (syscall_number)) |
a96d9b2e | 4634 | { |
1eb8556f | 4635 | infrun_debug_printf ("syscall number=%d", syscall_number); |
a96d9b2e | 4636 | |
16c381f0 | 4637 | ecs->event_thread->control.stop_bpstat |
d37e0847 PA |
4638 | = bpstat_stop_status_nowatch (regcache->aspace (), |
4639 | ecs->event_thread->stop_pc (), | |
4640 | ecs->event_thread, ecs->ws); | |
ab04a2af | 4641 | |
c65d6b55 | 4642 | if (handle_stop_requested (ecs)) |
c4464ade | 4643 | return false; |
c65d6b55 | 4644 | |
ce12b012 | 4645 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4646 | { |
4647 | /* Catchpoint hit. */ | |
c4464ade | 4648 | return false; |
ca2163eb | 4649 | } |
a96d9b2e | 4650 | } |
ca2163eb | 4651 | |
c65d6b55 | 4652 | if (handle_stop_requested (ecs)) |
c4464ade | 4653 | return false; |
c65d6b55 | 4654 | |
ca2163eb | 4655 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb | 4656 | keep_going (ecs); |
c4464ade SM |
4657 | |
4658 | return true; | |
a96d9b2e SDJ |
4659 | } |
4660 | ||
7e324e48 GB |
4661 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4662 | ||
4663 | static void | |
4664 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4665 | struct execution_control_state *ecs) | |
4666 | { | |
4667 | if (!ecs->stop_func_filled_in) | |
4668 | { | |
98a617f8 | 4669 | const block *block; |
fe830662 | 4670 | const general_symbol_info *gsi; |
98a617f8 | 4671 | |
7e324e48 GB |
4672 | /* Don't care about return value; stop_func_start and stop_func_name |
4673 | will both be 0 if it doesn't work. */ | |
1edb66d8 | 4674 | find_pc_partial_function_sym (ecs->event_thread->stop_pc (), |
fe830662 TT |
4675 | &gsi, |
4676 | &ecs->stop_func_start, | |
4677 | &ecs->stop_func_end, | |
4678 | &block); | |
4679 | ecs->stop_func_name = gsi == nullptr ? nullptr : gsi->print_name (); | |
98a617f8 KB |
4680 | |
4681 | /* The call to find_pc_partial_function, above, will set | |
4682 | stop_func_start and stop_func_end to the start and end | |
4683 | of the range containing the stop pc. If this range | |
4684 | contains the entry pc for the block (which is always the | |
4685 | case for contiguous blocks), advance stop_func_start past | |
4686 | the function's start offset and entrypoint. Note that | |
4687 | stop_func_start is NOT advanced when in a range of a | |
4688 | non-contiguous block that does not contain the entry pc. */ | |
4689 | if (block != nullptr | |
4690 | && ecs->stop_func_start <= BLOCK_ENTRY_PC (block) | |
4691 | && BLOCK_ENTRY_PC (block) < ecs->stop_func_end) | |
4692 | { | |
4693 | ecs->stop_func_start | |
4694 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4695 | ||
4696 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4697 | ecs->stop_func_start | |
4698 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4699 | } | |
591a12a1 | 4700 | |
7e324e48 GB |
4701 | ecs->stop_func_filled_in = 1; |
4702 | } | |
4703 | } | |
4704 | ||
4f5d7f63 | 4705 | |
00431a78 | 4706 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4707 | |
4708 | static enum stop_kind | |
00431a78 | 4709 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4710 | { |
5b6d1e4f | 4711 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4712 | |
4713 | gdb_assert (inf != NULL); | |
4714 | return inf->control.stop_soon; | |
4715 | } | |
4716 | ||
5b6d1e4f PA |
4717 | /* Poll for one event out of the current target. Store the resulting |
4718 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4719 | |
4720 | static ptid_t | |
5b6d1e4f | 4721 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4722 | { |
4723 | ptid_t event_ptid; | |
372316f1 PA |
4724 | |
4725 | overlay_cache_invalid = 1; | |
4726 | ||
4727 | /* Flush target cache before starting to handle each event. | |
4728 | Target was running and cache could be stale. This is just a | |
4729 | heuristic. Running threads may modify target memory, but we | |
4730 | don't get any event. */ | |
4731 | target_dcache_invalidate (); | |
4732 | ||
fb85cece | 4733 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4734 | |
4735 | if (debug_infrun) | |
c272a98c | 4736 | print_target_wait_results (minus_one_ptid, event_ptid, *ws); |
372316f1 PA |
4737 | |
4738 | return event_ptid; | |
4739 | } | |
4740 | ||
5b6d1e4f PA |
4741 | /* Wait for one event out of any target. */ |
4742 | ||
4743 | static wait_one_event | |
4744 | wait_one () | |
4745 | { | |
4746 | while (1) | |
4747 | { | |
4748 | for (inferior *inf : all_inferiors ()) | |
4749 | { | |
4750 | process_stratum_target *target = inf->process_target (); | |
4751 | if (target == NULL | |
4752 | || !target->is_async_p () | |
4753 | || !target->threads_executing) | |
4754 | continue; | |
4755 | ||
4756 | switch_to_inferior_no_thread (inf); | |
4757 | ||
4758 | wait_one_event event; | |
4759 | event.target = target; | |
4760 | event.ptid = poll_one_curr_target (&event.ws); | |
4761 | ||
183be222 | 4762 | if (event.ws.kind () == TARGET_WAITKIND_NO_RESUMED) |
5b6d1e4f PA |
4763 | { |
4764 | /* If nothing is resumed, remove the target from the | |
4765 | event loop. */ | |
4766 | target_async (0); | |
4767 | } | |
183be222 | 4768 | else if (event.ws.kind () != TARGET_WAITKIND_IGNORE) |
5b6d1e4f PA |
4769 | return event; |
4770 | } | |
4771 | ||
4772 | /* Block waiting for some event. */ | |
4773 | ||
4774 | fd_set readfds; | |
4775 | int nfds = 0; | |
4776 | ||
4777 | FD_ZERO (&readfds); | |
4778 | ||
4779 | for (inferior *inf : all_inferiors ()) | |
4780 | { | |
4781 | process_stratum_target *target = inf->process_target (); | |
4782 | if (target == NULL | |
4783 | || !target->is_async_p () | |
4784 | || !target->threads_executing) | |
4785 | continue; | |
4786 | ||
4787 | int fd = target->async_wait_fd (); | |
4788 | FD_SET (fd, &readfds); | |
4789 | if (nfds <= fd) | |
4790 | nfds = fd + 1; | |
4791 | } | |
4792 | ||
4793 | if (nfds == 0) | |
4794 | { | |
4795 | /* No waitable targets left. All must be stopped. */ | |
183be222 SM |
4796 | target_waitstatus ws; |
4797 | ws.set_no_resumed (); | |
4798 | return {NULL, minus_one_ptid, std::move (ws)}; | |
5b6d1e4f PA |
4799 | } |
4800 | ||
4801 | QUIT; | |
4802 | ||
4803 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4804 | if (numfds < 0) | |
4805 | { | |
4806 | if (errno == EINTR) | |
4807 | continue; | |
4808 | else | |
4809 | perror_with_name ("interruptible_select"); | |
4810 | } | |
4811 | } | |
4812 | } | |
4813 | ||
372316f1 PA |
4814 | /* Save the thread's event and stop reason to process it later. */ |
4815 | ||
4816 | static void | |
c272a98c | 4817 | save_waitstatus (struct thread_info *tp, const target_waitstatus &ws) |
372316f1 | 4818 | { |
96bbe3ef | 4819 | infrun_debug_printf ("saving status %s for %s", |
c272a98c | 4820 | ws.to_string ().c_str (), |
96bbe3ef | 4821 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
4822 | |
4823 | /* Record for later. */ | |
c272a98c | 4824 | tp->set_pending_waitstatus (ws); |
372316f1 | 4825 | |
c272a98c SM |
4826 | if (ws.kind () == TARGET_WAITKIND_STOPPED |
4827 | && ws.sig () == GDB_SIGNAL_TRAP) | |
372316f1 | 4828 | { |
89ba430c SM |
4829 | struct regcache *regcache = get_thread_regcache (tp); |
4830 | const address_space *aspace = regcache->aspace (); | |
372316f1 PA |
4831 | CORE_ADDR pc = regcache_read_pc (regcache); |
4832 | ||
c272a98c | 4833 | adjust_pc_after_break (tp, tp->pending_waitstatus ()); |
372316f1 | 4834 | |
18493a00 PA |
4835 | scoped_restore_current_thread restore_thread; |
4836 | switch_to_thread (tp); | |
4837 | ||
4838 | if (target_stopped_by_watchpoint ()) | |
1edb66d8 | 4839 | tp->set_stop_reason (TARGET_STOPPED_BY_WATCHPOINT); |
372316f1 | 4840 | else if (target_supports_stopped_by_sw_breakpoint () |
18493a00 | 4841 | && target_stopped_by_sw_breakpoint ()) |
1edb66d8 | 4842 | tp->set_stop_reason (TARGET_STOPPED_BY_SW_BREAKPOINT); |
372316f1 | 4843 | else if (target_supports_stopped_by_hw_breakpoint () |
18493a00 | 4844 | && target_stopped_by_hw_breakpoint ()) |
1edb66d8 | 4845 | tp->set_stop_reason (TARGET_STOPPED_BY_HW_BREAKPOINT); |
372316f1 | 4846 | else if (!target_supports_stopped_by_hw_breakpoint () |
1edb66d8 SM |
4847 | && hardware_breakpoint_inserted_here_p (aspace, pc)) |
4848 | tp->set_stop_reason (TARGET_STOPPED_BY_HW_BREAKPOINT); | |
372316f1 | 4849 | else if (!target_supports_stopped_by_sw_breakpoint () |
1edb66d8 SM |
4850 | && software_breakpoint_inserted_here_p (aspace, pc)) |
4851 | tp->set_stop_reason (TARGET_STOPPED_BY_SW_BREAKPOINT); | |
372316f1 PA |
4852 | else if (!thread_has_single_step_breakpoints_set (tp) |
4853 | && currently_stepping (tp)) | |
1edb66d8 | 4854 | tp->set_stop_reason (TARGET_STOPPED_BY_SINGLE_STEP); |
372316f1 PA |
4855 | } |
4856 | } | |
4857 | ||
293b3ebc TBA |
4858 | /* Mark the non-executing threads accordingly. In all-stop, all |
4859 | threads of all processes are stopped when we get any event | |
4860 | reported. In non-stop mode, only the event thread stops. */ | |
4861 | ||
4862 | static void | |
4863 | mark_non_executing_threads (process_stratum_target *target, | |
4864 | ptid_t event_ptid, | |
183be222 | 4865 | const target_waitstatus &ws) |
293b3ebc TBA |
4866 | { |
4867 | ptid_t mark_ptid; | |
4868 | ||
4869 | if (!target_is_non_stop_p ()) | |
4870 | mark_ptid = minus_one_ptid; | |
183be222 SM |
4871 | else if (ws.kind () == TARGET_WAITKIND_SIGNALLED |
4872 | || ws.kind () == TARGET_WAITKIND_EXITED) | |
293b3ebc TBA |
4873 | { |
4874 | /* If we're handling a process exit in non-stop mode, even | |
4875 | though threads haven't been deleted yet, one would think | |
4876 | that there is nothing to do, as threads of the dead process | |
4877 | will be soon deleted, and threads of any other process were | |
4878 | left running. However, on some targets, threads survive a | |
4879 | process exit event. E.g., for the "checkpoint" command, | |
4880 | when the current checkpoint/fork exits, linux-fork.c | |
4881 | automatically switches to another fork from within | |
4882 | target_mourn_inferior, by associating the same | |
4883 | inferior/thread to another fork. We haven't mourned yet at | |
4884 | this point, but we must mark any threads left in the | |
4885 | process as not-executing so that finish_thread_state marks | |
4886 | them stopped (in the user's perspective) if/when we present | |
4887 | the stop to the user. */ | |
4888 | mark_ptid = ptid_t (event_ptid.pid ()); | |
4889 | } | |
4890 | else | |
4891 | mark_ptid = event_ptid; | |
4892 | ||
4893 | set_executing (target, mark_ptid, false); | |
4894 | ||
4895 | /* Likewise the resumed flag. */ | |
4896 | set_resumed (target, mark_ptid, false); | |
4897 | } | |
4898 | ||
d758e62c PA |
4899 | /* Handle one event after stopping threads. If the eventing thread |
4900 | reports back any interesting event, we leave it pending. If the | |
4901 | eventing thread was in the middle of a displaced step, we | |
8ff53139 PA |
4902 | cancel/finish it, and unless the thread's inferior is being |
4903 | detached, put the thread back in the step-over chain. Returns true | |
4904 | if there are no resumed threads left in the target (thus there's no | |
4905 | point in waiting further), false otherwise. */ | |
d758e62c PA |
4906 | |
4907 | static bool | |
4908 | handle_one (const wait_one_event &event) | |
4909 | { | |
4910 | infrun_debug_printf | |
7dca2ea7 | 4911 | ("%s %s", event.ws.to_string ().c_str (), |
0fab7955 | 4912 | event.ptid.to_string ().c_str ()); |
d758e62c | 4913 | |
183be222 | 4914 | if (event.ws.kind () == TARGET_WAITKIND_NO_RESUMED) |
d758e62c PA |
4915 | { |
4916 | /* All resumed threads exited. */ | |
4917 | return true; | |
4918 | } | |
183be222 SM |
4919 | else if (event.ws.kind () == TARGET_WAITKIND_THREAD_EXITED |
4920 | || event.ws.kind () == TARGET_WAITKIND_EXITED | |
4921 | || event.ws.kind () == TARGET_WAITKIND_SIGNALLED) | |
d758e62c PA |
4922 | { |
4923 | /* One thread/process exited/signalled. */ | |
4924 | ||
4925 | thread_info *t = nullptr; | |
4926 | ||
4927 | /* The target may have reported just a pid. If so, try | |
4928 | the first non-exited thread. */ | |
4929 | if (event.ptid.is_pid ()) | |
4930 | { | |
4931 | int pid = event.ptid.pid (); | |
4932 | inferior *inf = find_inferior_pid (event.target, pid); | |
4933 | for (thread_info *tp : inf->non_exited_threads ()) | |
4934 | { | |
4935 | t = tp; | |
4936 | break; | |
4937 | } | |
4938 | ||
4939 | /* If there is no available thread, the event would | |
4940 | have to be appended to a per-inferior event list, | |
4941 | which does not exist (and if it did, we'd have | |
4942 | to adjust run control command to be able to | |
4943 | resume such an inferior). We assert here instead | |
4944 | of going into an infinite loop. */ | |
4945 | gdb_assert (t != nullptr); | |
4946 | ||
4947 | infrun_debug_printf | |
0fab7955 | 4948 | ("using %s", t->ptid.to_string ().c_str ()); |
d758e62c PA |
4949 | } |
4950 | else | |
4951 | { | |
4952 | t = find_thread_ptid (event.target, event.ptid); | |
4953 | /* Check if this is the first time we see this thread. | |
4954 | Don't bother adding if it individually exited. */ | |
4955 | if (t == nullptr | |
183be222 | 4956 | && event.ws.kind () != TARGET_WAITKIND_THREAD_EXITED) |
d758e62c PA |
4957 | t = add_thread (event.target, event.ptid); |
4958 | } | |
4959 | ||
4960 | if (t != nullptr) | |
4961 | { | |
4962 | /* Set the threads as non-executing to avoid | |
4963 | another stop attempt on them. */ | |
4964 | switch_to_thread_no_regs (t); | |
4965 | mark_non_executing_threads (event.target, event.ptid, | |
4966 | event.ws); | |
c272a98c | 4967 | save_waitstatus (t, event.ws); |
d758e62c PA |
4968 | t->stop_requested = false; |
4969 | } | |
4970 | } | |
4971 | else | |
4972 | { | |
4973 | thread_info *t = find_thread_ptid (event.target, event.ptid); | |
4974 | if (t == NULL) | |
4975 | t = add_thread (event.target, event.ptid); | |
4976 | ||
4977 | t->stop_requested = 0; | |
611841bb | 4978 | t->set_executing (false); |
7846f3aa | 4979 | t->set_resumed (false); |
d758e62c PA |
4980 | t->control.may_range_step = 0; |
4981 | ||
4982 | /* This may be the first time we see the inferior report | |
4983 | a stop. */ | |
3db13541 | 4984 | if (t->inf->needs_setup) |
d758e62c PA |
4985 | { |
4986 | switch_to_thread_no_regs (t); | |
4987 | setup_inferior (0); | |
4988 | } | |
4989 | ||
183be222 SM |
4990 | if (event.ws.kind () == TARGET_WAITKIND_STOPPED |
4991 | && event.ws.sig () == GDB_SIGNAL_0) | |
d758e62c PA |
4992 | { |
4993 | /* We caught the event that we intended to catch, so | |
1edb66d8 | 4994 | there's no event to save as pending. */ |
d758e62c PA |
4995 | |
4996 | if (displaced_step_finish (t, GDB_SIGNAL_0) | |
4997 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) | |
4998 | { | |
4999 | /* Add it back to the step-over queue. */ | |
5000 | infrun_debug_printf | |
5001 | ("displaced-step of %s canceled", | |
0fab7955 | 5002 | t->ptid.to_string ().c_str ()); |
d758e62c PA |
5003 | |
5004 | t->control.trap_expected = 0; | |
8ff53139 PA |
5005 | if (!t->inf->detaching) |
5006 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
5007 | } |
5008 | } | |
5009 | else | |
5010 | { | |
5011 | enum gdb_signal sig; | |
5012 | struct regcache *regcache; | |
5013 | ||
5014 | infrun_debug_printf | |
96bbe3ef | 5015 | ("target_wait %s, saving status for %s", |
7dca2ea7 | 5016 | event.ws.to_string ().c_str (), |
96bbe3ef | 5017 | t->ptid.to_string ().c_str ()); |
d758e62c PA |
5018 | |
5019 | /* Record for later. */ | |
c272a98c | 5020 | save_waitstatus (t, event.ws); |
d758e62c | 5021 | |
183be222 SM |
5022 | sig = (event.ws.kind () == TARGET_WAITKIND_STOPPED |
5023 | ? event.ws.sig () : GDB_SIGNAL_0); | |
d758e62c PA |
5024 | |
5025 | if (displaced_step_finish (t, sig) | |
5026 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) | |
5027 | { | |
5028 | /* Add it back to the step-over queue. */ | |
5029 | t->control.trap_expected = 0; | |
8ff53139 PA |
5030 | if (!t->inf->detaching) |
5031 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
5032 | } |
5033 | ||
5034 | regcache = get_thread_regcache (t); | |
1edb66d8 | 5035 | t->set_stop_pc (regcache_read_pc (regcache)); |
d758e62c PA |
5036 | |
5037 | infrun_debug_printf ("saved stop_pc=%s for %s " | |
5038 | "(currently_stepping=%d)", | |
1edb66d8 | 5039 | paddress (target_gdbarch (), t->stop_pc ()), |
0fab7955 | 5040 | t->ptid.to_string ().c_str (), |
d758e62c PA |
5041 | currently_stepping (t)); |
5042 | } | |
5043 | } | |
5044 | ||
5045 | return false; | |
5046 | } | |
5047 | ||
6efcd9a8 | 5048 | /* See infrun.h. */ |
372316f1 | 5049 | |
6efcd9a8 | 5050 | void |
148cf134 | 5051 | stop_all_threads (const char *reason, inferior *inf) |
372316f1 PA |
5052 | { |
5053 | /* We may need multiple passes to discover all threads. */ | |
5054 | int pass; | |
5055 | int iterations = 0; | |
372316f1 | 5056 | |
53cccef1 | 5057 | gdb_assert (exists_non_stop_target ()); |
372316f1 | 5058 | |
148cf134 SM |
5059 | INFRUN_SCOPED_DEBUG_START_END ("reason=%s, inf=%d", reason, |
5060 | inf != nullptr ? inf->num : -1); | |
372316f1 | 5061 | |
00431a78 | 5062 | scoped_restore_current_thread restore_thread; |
372316f1 | 5063 | |
148cf134 | 5064 | /* Enable thread events on relevant targets. */ |
6ad82919 TBA |
5065 | for (auto *target : all_non_exited_process_targets ()) |
5066 | { | |
148cf134 SM |
5067 | if (inf != nullptr && inf->process_target () != target) |
5068 | continue; | |
5069 | ||
6ad82919 TBA |
5070 | switch_to_target_no_thread (target); |
5071 | target_thread_events (true); | |
5072 | } | |
5073 | ||
5074 | SCOPE_EXIT | |
5075 | { | |
148cf134 | 5076 | /* Disable thread events on relevant targets. */ |
6ad82919 TBA |
5077 | for (auto *target : all_non_exited_process_targets ()) |
5078 | { | |
148cf134 SM |
5079 | if (inf != nullptr && inf->process_target () != target) |
5080 | continue; | |
5081 | ||
6ad82919 TBA |
5082 | switch_to_target_no_thread (target); |
5083 | target_thread_events (false); | |
5084 | } | |
5085 | ||
17417fb0 | 5086 | /* Use debug_prefixed_printf directly to get a meaningful function |
dda83cd7 | 5087 | name. */ |
6ad82919 | 5088 | if (debug_infrun) |
17417fb0 | 5089 | debug_prefixed_printf ("infrun", "stop_all_threads", "done"); |
6ad82919 | 5090 | }; |
65706a29 | 5091 | |
372316f1 PA |
5092 | /* Request threads to stop, and then wait for the stops. Because |
5093 | threads we already know about can spawn more threads while we're | |
5094 | trying to stop them, and we only learn about new threads when we | |
5095 | update the thread list, do this in a loop, and keep iterating | |
5096 | until two passes find no threads that need to be stopped. */ | |
5097 | for (pass = 0; pass < 2; pass++, iterations++) | |
5098 | { | |
1eb8556f | 5099 | infrun_debug_printf ("pass=%d, iterations=%d", pass, iterations); |
372316f1 PA |
5100 | while (1) |
5101 | { | |
29d6859f | 5102 | int waits_needed = 0; |
372316f1 | 5103 | |
a05575d3 TBA |
5104 | for (auto *target : all_non_exited_process_targets ()) |
5105 | { | |
148cf134 SM |
5106 | if (inf != nullptr && inf->process_target () != target) |
5107 | continue; | |
5108 | ||
a05575d3 TBA |
5109 | switch_to_target_no_thread (target); |
5110 | update_thread_list (); | |
5111 | } | |
372316f1 PA |
5112 | |
5113 | /* Go through all threads looking for threads that we need | |
5114 | to tell the target to stop. */ | |
08036331 | 5115 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 5116 | { |
148cf134 SM |
5117 | if (inf != nullptr && t->inf != inf) |
5118 | continue; | |
5119 | ||
53cccef1 TBA |
5120 | /* For a single-target setting with an all-stop target, |
5121 | we would not even arrive here. For a multi-target | |
5122 | setting, until GDB is able to handle a mixture of | |
5123 | all-stop and non-stop targets, simply skip all-stop | |
5124 | targets' threads. This should be fine due to the | |
5125 | protection of 'check_multi_target_resumption'. */ | |
5126 | ||
5127 | switch_to_thread_no_regs (t); | |
5128 | if (!target_is_non_stop_p ()) | |
5129 | continue; | |
5130 | ||
611841bb | 5131 | if (t->executing ()) |
372316f1 PA |
5132 | { |
5133 | /* If already stopping, don't request a stop again. | |
5134 | We just haven't seen the notification yet. */ | |
5135 | if (!t->stop_requested) | |
5136 | { | |
1eb8556f | 5137 | infrun_debug_printf (" %s executing, need stop", |
0fab7955 | 5138 | t->ptid.to_string ().c_str ()); |
372316f1 PA |
5139 | target_stop (t->ptid); |
5140 | t->stop_requested = 1; | |
5141 | } | |
5142 | else | |
5143 | { | |
1eb8556f | 5144 | infrun_debug_printf (" %s executing, already stopping", |
0fab7955 | 5145 | t->ptid.to_string ().c_str ()); |
372316f1 PA |
5146 | } |
5147 | ||
5148 | if (t->stop_requested) | |
29d6859f | 5149 | waits_needed++; |
372316f1 PA |
5150 | } |
5151 | else | |
5152 | { | |
1eb8556f | 5153 | infrun_debug_printf (" %s not executing", |
0fab7955 | 5154 | t->ptid.to_string ().c_str ()); |
372316f1 PA |
5155 | |
5156 | /* The thread may be not executing, but still be | |
5157 | resumed with a pending status to process. */ | |
7846f3aa | 5158 | t->set_resumed (false); |
372316f1 PA |
5159 | } |
5160 | } | |
5161 | ||
29d6859f | 5162 | if (waits_needed == 0) |
372316f1 PA |
5163 | break; |
5164 | ||
5165 | /* If we find new threads on the second iteration, restart | |
5166 | over. We want to see two iterations in a row with all | |
5167 | threads stopped. */ | |
5168 | if (pass > 0) | |
5169 | pass = -1; | |
5170 | ||
29d6859f | 5171 | for (int i = 0; i < waits_needed; i++) |
c29705b7 | 5172 | { |
29d6859f | 5173 | wait_one_event event = wait_one (); |
d758e62c PA |
5174 | if (handle_one (event)) |
5175 | break; | |
372316f1 PA |
5176 | } |
5177 | } | |
5178 | } | |
372316f1 PA |
5179 | } |
5180 | ||
f4836ba9 PA |
5181 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
5182 | ||
c4464ade | 5183 | static bool |
f4836ba9 PA |
5184 | handle_no_resumed (struct execution_control_state *ecs) |
5185 | { | |
3b12939d | 5186 | if (target_can_async_p ()) |
f4836ba9 | 5187 | { |
c4464ade | 5188 | bool any_sync = false; |
f4836ba9 | 5189 | |
2dab0c7b | 5190 | for (ui *ui : all_uis ()) |
3b12939d PA |
5191 | { |
5192 | if (ui->prompt_state == PROMPT_BLOCKED) | |
5193 | { | |
c4464ade | 5194 | any_sync = true; |
3b12939d PA |
5195 | break; |
5196 | } | |
5197 | } | |
5198 | if (!any_sync) | |
5199 | { | |
5200 | /* There were no unwaited-for children left in the target, but, | |
5201 | we're not synchronously waiting for events either. Just | |
5202 | ignore. */ | |
5203 | ||
1eb8556f | 5204 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)"); |
3b12939d | 5205 | prepare_to_wait (ecs); |
c4464ade | 5206 | return true; |
3b12939d | 5207 | } |
f4836ba9 PA |
5208 | } |
5209 | ||
5210 | /* Otherwise, if we were running a synchronous execution command, we | |
5211 | may need to cancel it and give the user back the terminal. | |
5212 | ||
5213 | In non-stop mode, the target can't tell whether we've already | |
5214 | consumed previous stop events, so it can end up sending us a | |
5215 | no-resumed event like so: | |
5216 | ||
5217 | #0 - thread 1 is left stopped | |
5218 | ||
5219 | #1 - thread 2 is resumed and hits breakpoint | |
dda83cd7 | 5220 | -> TARGET_WAITKIND_STOPPED |
f4836ba9 PA |
5221 | |
5222 | #2 - thread 3 is resumed and exits | |
dda83cd7 | 5223 | this is the last resumed thread, so |
f4836ba9 PA |
5224 | -> TARGET_WAITKIND_NO_RESUMED |
5225 | ||
5226 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
dda83cd7 | 5227 | it. |
f4836ba9 PA |
5228 | |
5229 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
dda83cd7 | 5230 | thread 2 is now resumed, so the event should be ignored. |
f4836ba9 PA |
5231 | |
5232 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
5233 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
5234 | event. But it could be that the event meant that thread 2 itself | |
5235 | (or whatever other thread was the last resumed thread) exited. | |
5236 | ||
5237 | To address this we refresh the thread list and check whether we | |
5238 | have resumed threads _now_. In the example above, this removes | |
5239 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
5240 | ignore this event. If we find no thread resumed, then we cancel | |
7d3badc6 PA |
5241 | the synchronous command and show "no unwaited-for " to the |
5242 | user. */ | |
f4836ba9 | 5243 | |
d6cc5d98 | 5244 | inferior *curr_inf = current_inferior (); |
7d3badc6 | 5245 | |
d6cc5d98 | 5246 | scoped_restore_current_thread restore_thread; |
1e864019 | 5247 | update_thread_list (); |
d6cc5d98 PA |
5248 | |
5249 | /* If: | |
5250 | ||
5251 | - the current target has no thread executing, and | |
5252 | - the current inferior is native, and | |
5253 | - the current inferior is the one which has the terminal, and | |
5254 | - we did nothing, | |
5255 | ||
5256 | then a Ctrl-C from this point on would remain stuck in the | |
5257 | kernel, until a thread resumes and dequeues it. That would | |
5258 | result in the GDB CLI not reacting to Ctrl-C, not able to | |
5259 | interrupt the program. To address this, if the current inferior | |
5260 | no longer has any thread executing, we give the terminal to some | |
5261 | other inferior that has at least one thread executing. */ | |
5262 | bool swap_terminal = true; | |
5263 | ||
5264 | /* Whether to ignore this TARGET_WAITKIND_NO_RESUMED event, or | |
5265 | whether to report it to the user. */ | |
5266 | bool ignore_event = false; | |
7d3badc6 PA |
5267 | |
5268 | for (thread_info *thread : all_non_exited_threads ()) | |
f4836ba9 | 5269 | { |
611841bb | 5270 | if (swap_terminal && thread->executing ()) |
d6cc5d98 PA |
5271 | { |
5272 | if (thread->inf != curr_inf) | |
5273 | { | |
5274 | target_terminal::ours (); | |
5275 | ||
5276 | switch_to_thread (thread); | |
5277 | target_terminal::inferior (); | |
5278 | } | |
5279 | swap_terminal = false; | |
5280 | } | |
5281 | ||
4d772ea2 | 5282 | if (!ignore_event && thread->resumed ()) |
f4836ba9 | 5283 | { |
7d3badc6 PA |
5284 | /* Either there were no unwaited-for children left in the |
5285 | target at some point, but there are now, or some target | |
5286 | other than the eventing one has unwaited-for children | |
5287 | left. Just ignore. */ | |
1eb8556f SM |
5288 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED " |
5289 | "(ignoring: found resumed)"); | |
d6cc5d98 PA |
5290 | |
5291 | ignore_event = true; | |
f4836ba9 | 5292 | } |
d6cc5d98 PA |
5293 | |
5294 | if (ignore_event && !swap_terminal) | |
5295 | break; | |
5296 | } | |
5297 | ||
5298 | if (ignore_event) | |
5299 | { | |
5300 | switch_to_inferior_no_thread (curr_inf); | |
5301 | prepare_to_wait (ecs); | |
c4464ade | 5302 | return true; |
f4836ba9 PA |
5303 | } |
5304 | ||
5305 | /* Go ahead and report the event. */ | |
c4464ade | 5306 | return false; |
f4836ba9 PA |
5307 | } |
5308 | ||
05ba8510 PA |
5309 | /* Given an execution control state that has been freshly filled in by |
5310 | an event from the inferior, figure out what it means and take | |
5311 | appropriate action. | |
5312 | ||
5313 | The alternatives are: | |
5314 | ||
22bcd14b | 5315 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5316 | debugger. |
5317 | ||
5318 | 2) keep_going and return; to wait for the next event (set | |
5319 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5320 | once). */ | |
c906108c | 5321 | |
ec9499be | 5322 | static void |
595915c1 | 5323 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5324 | { |
595915c1 TT |
5325 | /* Make sure that all temporary struct value objects that were |
5326 | created during the handling of the event get deleted at the | |
5327 | end. */ | |
5328 | scoped_value_mark free_values; | |
5329 | ||
7dca2ea7 | 5330 | infrun_debug_printf ("%s", ecs->ws.to_string ().c_str ()); |
c29705b7 | 5331 | |
183be222 | 5332 | if (ecs->ws.kind () == TARGET_WAITKIND_IGNORE) |
28736962 PA |
5333 | { |
5334 | /* We had an event in the inferior, but we are not interested in | |
5335 | handling it at this level. The lower layers have already | |
5336 | done what needs to be done, if anything. | |
5337 | ||
5338 | One of the possible circumstances for this is when the | |
5339 | inferior produces output for the console. The inferior has | |
5340 | not stopped, and we are ignoring the event. Another possible | |
5341 | circumstance is any event which the lower level knows will be | |
5342 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5343 | prepare_to_wait (ecs); |
5344 | return; | |
5345 | } | |
5346 | ||
183be222 | 5347 | if (ecs->ws.kind () == TARGET_WAITKIND_THREAD_EXITED) |
65706a29 | 5348 | { |
65706a29 PA |
5349 | prepare_to_wait (ecs); |
5350 | return; | |
5351 | } | |
5352 | ||
183be222 | 5353 | if (ecs->ws.kind () == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5354 | && handle_no_resumed (ecs)) |
5355 | return; | |
0e5bf2a8 | 5356 | |
5b6d1e4f PA |
5357 | /* Cache the last target/ptid/waitstatus. */ |
5358 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5359 | |
ca005067 | 5360 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5361 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5362 | |
183be222 | 5363 | if (ecs->ws.kind () == TARGET_WAITKIND_NO_RESUMED) |
0e5bf2a8 PA |
5364 | { |
5365 | /* No unwaited-for children left. IOW, all resumed children | |
5366 | have exited. */ | |
c4464ade | 5367 | stop_print_frame = false; |
22bcd14b | 5368 | stop_waiting (ecs); |
0e5bf2a8 PA |
5369 | return; |
5370 | } | |
5371 | ||
183be222 SM |
5372 | if (ecs->ws.kind () != TARGET_WAITKIND_EXITED |
5373 | && ecs->ws.kind () != TARGET_WAITKIND_SIGNALLED) | |
359f5fe6 | 5374 | { |
5b6d1e4f | 5375 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5376 | /* If it's a new thread, add it to the thread database. */ |
5377 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5378 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5379 | |
5380 | /* Disable range stepping. If the next step request could use a | |
5381 | range, this will be end up re-enabled then. */ | |
5382 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5383 | } |
88ed393a JK |
5384 | |
5385 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
c272a98c | 5386 | adjust_pc_after_break (ecs->event_thread, ecs->ws); |
88ed393a JK |
5387 | |
5388 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5389 | reinit_frame_cache (); | |
5390 | ||
28736962 PA |
5391 | breakpoint_retire_moribund (); |
5392 | ||
2b009048 DJ |
5393 | /* First, distinguish signals caused by the debugger from signals |
5394 | that have to do with the program's own actions. Note that | |
5395 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5396 | on the operating system version. Here we detect when a SIGILL or | |
5397 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5398 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5399 | when we're trying to execute a breakpoint instruction on a | |
5400 | non-executable stack. This happens for call dummy breakpoints | |
5401 | for architectures like SPARC that place call dummies on the | |
5402 | stack. */ | |
183be222 SM |
5403 | if (ecs->ws.kind () == TARGET_WAITKIND_STOPPED |
5404 | && (ecs->ws.sig () == GDB_SIGNAL_ILL | |
5405 | || ecs->ws.sig () == GDB_SIGNAL_SEGV | |
5406 | || ecs->ws.sig () == GDB_SIGNAL_EMT)) | |
2b009048 | 5407 | { |
00431a78 | 5408 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5409 | |
a01bda52 | 5410 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5411 | regcache_read_pc (regcache))) |
5412 | { | |
1eb8556f | 5413 | infrun_debug_printf ("Treating signal as SIGTRAP"); |
183be222 | 5414 | ecs->ws.set_stopped (GDB_SIGNAL_TRAP); |
de0a0249 | 5415 | } |
2b009048 DJ |
5416 | } |
5417 | ||
293b3ebc | 5418 | mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws); |
8c90c137 | 5419 | |
183be222 | 5420 | switch (ecs->ws.kind ()) |
488f131b JB |
5421 | { |
5422 | case TARGET_WAITKIND_LOADED: | |
72d383bb SM |
5423 | { |
5424 | context_switch (ecs); | |
5425 | /* Ignore gracefully during startup of the inferior, as it might | |
5426 | be the shell which has just loaded some objects, otherwise | |
5427 | add the symbols for the newly loaded objects. Also ignore at | |
5428 | the beginning of an attach or remote session; we will query | |
5429 | the full list of libraries once the connection is | |
5430 | established. */ | |
5431 | ||
5432 | stop_kind stop_soon = get_inferior_stop_soon (ecs); | |
5433 | if (stop_soon == NO_STOP_QUIETLY) | |
5434 | { | |
5435 | struct regcache *regcache; | |
edcc5120 | 5436 | |
72d383bb | 5437 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 | 5438 | |
72d383bb | 5439 | handle_solib_event (); |
ab04a2af | 5440 | |
9279eb5c | 5441 | ecs->event_thread->set_stop_pc (regcache_read_pc (regcache)); |
72d383bb | 5442 | ecs->event_thread->control.stop_bpstat |
d37e0847 PA |
5443 | = bpstat_stop_status_nowatch (regcache->aspace (), |
5444 | ecs->event_thread->stop_pc (), | |
5445 | ecs->event_thread, ecs->ws); | |
c65d6b55 | 5446 | |
72d383bb | 5447 | if (handle_stop_requested (ecs)) |
94c57d6a | 5448 | return; |
488f131b | 5449 | |
72d383bb SM |
5450 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
5451 | { | |
5452 | /* A catchpoint triggered. */ | |
5453 | process_event_stop_test (ecs); | |
5454 | return; | |
5455 | } | |
55409f9d | 5456 | |
72d383bb SM |
5457 | /* If requested, stop when the dynamic linker notifies |
5458 | gdb of events. This allows the user to get control | |
5459 | and place breakpoints in initializer routines for | |
5460 | dynamically loaded objects (among other things). */ | |
1edb66d8 | 5461 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
72d383bb SM |
5462 | if (stop_on_solib_events) |
5463 | { | |
5464 | /* Make sure we print "Stopped due to solib-event" in | |
5465 | normal_stop. */ | |
5466 | stop_print_frame = true; | |
b0f4b84b | 5467 | |
72d383bb SM |
5468 | stop_waiting (ecs); |
5469 | return; | |
5470 | } | |
5471 | } | |
b0f4b84b | 5472 | |
72d383bb SM |
5473 | /* If we are skipping through a shell, or through shared library |
5474 | loading that we aren't interested in, resume the program. If | |
5475 | we're running the program normally, also resume. */ | |
5476 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
5477 | { | |
5478 | /* Loading of shared libraries might have changed breakpoint | |
5479 | addresses. Make sure new breakpoints are inserted. */ | |
5480 | if (stop_soon == NO_STOP_QUIETLY) | |
5481 | insert_breakpoints (); | |
5482 | resume (GDB_SIGNAL_0); | |
5483 | prepare_to_wait (ecs); | |
5484 | return; | |
5485 | } | |
5c09a2c5 | 5486 | |
72d383bb SM |
5487 | /* But stop if we're attaching or setting up a remote |
5488 | connection. */ | |
5489 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5490 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5491 | { | |
5492 | infrun_debug_printf ("quietly stopped"); | |
5493 | stop_waiting (ecs); | |
5494 | return; | |
5495 | } | |
5496 | ||
5497 | internal_error (__FILE__, __LINE__, | |
5498 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
5499 | } | |
c5aa993b | 5500 | |
488f131b | 5501 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5502 | if (handle_stop_requested (ecs)) |
5503 | return; | |
00431a78 | 5504 | context_switch (ecs); |
64ce06e4 | 5505 | resume (GDB_SIGNAL_0); |
488f131b JB |
5506 | prepare_to_wait (ecs); |
5507 | return; | |
c5aa993b | 5508 | |
65706a29 | 5509 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5510 | if (handle_stop_requested (ecs)) |
5511 | return; | |
00431a78 | 5512 | context_switch (ecs); |
65706a29 PA |
5513 | if (!switch_back_to_stepped_thread (ecs)) |
5514 | keep_going (ecs); | |
5515 | return; | |
5516 | ||
488f131b | 5517 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5518 | case TARGET_WAITKIND_SIGNALLED: |
18493a00 PA |
5519 | { |
5520 | /* Depending on the system, ecs->ptid may point to a thread or | |
5521 | to a process. On some targets, target_mourn_inferior may | |
5522 | need to have access to the just-exited thread. That is the | |
5523 | case of GNU/Linux's "checkpoint" support, for example. | |
5524 | Call the switch_to_xxx routine as appropriate. */ | |
5525 | thread_info *thr = find_thread_ptid (ecs->target, ecs->ptid); | |
5526 | if (thr != nullptr) | |
5527 | switch_to_thread (thr); | |
5528 | else | |
5529 | { | |
5530 | inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); | |
5531 | switch_to_inferior_no_thread (inf); | |
5532 | } | |
5533 | } | |
6c95b8df | 5534 | handle_vfork_child_exec_or_exit (0); |
223ffa71 | 5535 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5536 | |
0c557179 SDJ |
5537 | /* Clearing any previous state of convenience variables. */ |
5538 | clear_exit_convenience_vars (); | |
5539 | ||
183be222 | 5540 | if (ecs->ws.kind () == TARGET_WAITKIND_EXITED) |
940c3c06 PA |
5541 | { |
5542 | /* Record the exit code in the convenience variable $_exitcode, so | |
5543 | that the user can inspect this again later. */ | |
5544 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
183be222 | 5545 | (LONGEST) ecs->ws.exit_status ()); |
940c3c06 PA |
5546 | |
5547 | /* Also record this in the inferior itself. */ | |
5548 | current_inferior ()->has_exit_code = 1; | |
183be222 | 5549 | current_inferior ()->exit_code = (LONGEST) ecs->ws.exit_status (); |
8cf64490 | 5550 | |
98eb56a4 | 5551 | /* Support the --return-child-result option. */ |
183be222 | 5552 | return_child_result_value = ecs->ws.exit_status (); |
98eb56a4 | 5553 | |
183be222 | 5554 | gdb::observers::exited.notify (ecs->ws.exit_status ()); |
940c3c06 PA |
5555 | } |
5556 | else | |
0c557179 | 5557 | { |
00431a78 | 5558 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5559 | |
5560 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5561 | { | |
5562 | /* Set the value of the internal variable $_exitsignal, | |
5563 | which holds the signal uncaught by the inferior. */ | |
5564 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5565 | gdbarch_gdb_signal_to_target (gdbarch, | |
183be222 | 5566 | ecs->ws.sig ())); |
0c557179 SDJ |
5567 | } |
5568 | else | |
5569 | { | |
5570 | /* We don't have access to the target's method used for | |
5571 | converting between signal numbers (GDB's internal | |
5572 | representation <-> target's representation). | |
5573 | Therefore, we cannot do a good job at displaying this | |
5574 | information to the user. It's better to just warn | |
5575 | her about it (if infrun debugging is enabled), and | |
5576 | give up. */ | |
1eb8556f SM |
5577 | infrun_debug_printf ("Cannot fill $_exitsignal with the correct " |
5578 | "signal number."); | |
0c557179 SDJ |
5579 | } |
5580 | ||
183be222 | 5581 | gdb::observers::signal_exited.notify (ecs->ws.sig ()); |
0c557179 | 5582 | } |
8cf64490 | 5583 | |
488f131b | 5584 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5585 | target_mourn_inferior (inferior_ptid); |
c4464ade | 5586 | stop_print_frame = false; |
22bcd14b | 5587 | stop_waiting (ecs); |
488f131b | 5588 | return; |
c5aa993b | 5589 | |
488f131b | 5590 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5591 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5592 | /* Check whether the inferior is displaced stepping. */ |
5593 | { | |
00431a78 | 5594 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5595 | struct gdbarch *gdbarch = regcache->arch (); |
c0aba012 | 5596 | inferior *parent_inf = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 | 5597 | |
aeeb758d JB |
5598 | /* If this is a fork (child gets its own address space copy) |
5599 | and some displaced step buffers were in use at the time of | |
5600 | the fork, restore the displaced step buffer bytes in the | |
5601 | child process. | |
5602 | ||
5603 | Architectures which support displaced stepping and fork | |
5604 | events must supply an implementation of | |
5605 | gdbarch_displaced_step_restore_all_in_ptid. This is not | |
5606 | enforced during gdbarch validation to support architectures | |
5607 | which support displaced stepping but not forks. */ | |
183be222 | 5608 | if (ecs->ws.kind () == TARGET_WAITKIND_FORKED |
aeeb758d | 5609 | && gdbarch_supports_displaced_stepping (gdbarch)) |
187b041e | 5610 | gdbarch_displaced_step_restore_all_in_ptid |
183be222 | 5611 | (gdbarch, parent_inf, ecs->ws.child_ptid ()); |
c0aba012 SM |
5612 | |
5613 | /* If displaced stepping is supported, and thread ecs->ptid is | |
5614 | displaced stepping. */ | |
00431a78 | 5615 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 | 5616 | { |
e2d96639 YQ |
5617 | struct regcache *child_regcache; |
5618 | CORE_ADDR parent_pc; | |
5619 | ||
5620 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
5621 | indicating that the displaced stepping of syscall instruction | |
5622 | has been done. Perform cleanup for parent process here. Note | |
5623 | that this operation also cleans up the child process for vfork, | |
5624 | because their pages are shared. */ | |
7def77a1 | 5625 | displaced_step_finish (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5626 | /* Start a new step-over in another thread if there's one |
5627 | that needs it. */ | |
5628 | start_step_over (); | |
e2d96639 | 5629 | |
e2d96639 YQ |
5630 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5631 | the child's PC is also within the scratchpad. Set the child's PC | |
5632 | to the parent's PC value, which has already been fixed up. | |
5633 | FIXME: we use the parent's aspace here, although we're touching | |
5634 | the child, because the child hasn't been added to the inferior | |
5635 | list yet at this point. */ | |
5636 | ||
5637 | child_regcache | |
5b6d1e4f | 5638 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
183be222 | 5639 | ecs->ws.child_ptid (), |
e2d96639 YQ |
5640 | gdbarch, |
5641 | parent_inf->aspace); | |
5642 | /* Read PC value of parent process. */ | |
5643 | parent_pc = regcache_read_pc (regcache); | |
5644 | ||
136821d9 SM |
5645 | displaced_debug_printf ("write child pc from %s to %s", |
5646 | paddress (gdbarch, | |
5647 | regcache_read_pc (child_regcache)), | |
5648 | paddress (gdbarch, parent_pc)); | |
e2d96639 YQ |
5649 | |
5650 | regcache_write_pc (child_regcache, parent_pc); | |
5651 | } | |
5652 | } | |
5653 | ||
00431a78 | 5654 | context_switch (ecs); |
5a2901d9 | 5655 | |
b242c3c2 PA |
5656 | /* Immediately detach breakpoints from the child before there's |
5657 | any chance of letting the user delete breakpoints from the | |
5658 | breakpoint lists. If we don't do this early, it's easy to | |
5659 | leave left over traps in the child, vis: "break foo; catch | |
5660 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5661 | the fork on the last `continue', and by that time the | |
5662 | breakpoint at "foo" is long gone from the breakpoint table. | |
5663 | If we vforked, then we don't need to unpatch here, since both | |
5664 | parent and child are sharing the same memory pages; we'll | |
5665 | need to unpatch at follow/detach time instead to be certain | |
5666 | that new breakpoints added between catchpoint hit time and | |
5667 | vfork follow are detached. */ | |
183be222 | 5668 | if (ecs->ws.kind () != TARGET_WAITKIND_VFORKED) |
b242c3c2 | 5669 | { |
b242c3c2 PA |
5670 | /* This won't actually modify the breakpoint list, but will |
5671 | physically remove the breakpoints from the child. */ | |
183be222 | 5672 | detach_breakpoints (ecs->ws.child_ptid ()); |
b242c3c2 PA |
5673 | } |
5674 | ||
34b7e8a6 | 5675 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5676 | |
e58b0e63 PA |
5677 | /* In case the event is caught by a catchpoint, remember that |
5678 | the event is to be followed at the next resume of the thread, | |
5679 | and not immediately. */ | |
5680 | ecs->event_thread->pending_follow = ecs->ws; | |
5681 | ||
1edb66d8 SM |
5682 | ecs->event_thread->set_stop_pc |
5683 | (regcache_read_pc (get_thread_regcache (ecs->event_thread))); | |
675bf4cb | 5684 | |
16c381f0 | 5685 | ecs->event_thread->control.stop_bpstat |
d37e0847 PA |
5686 | = bpstat_stop_status_nowatch (get_current_regcache ()->aspace (), |
5687 | ecs->event_thread->stop_pc (), | |
5688 | ecs->event_thread, ecs->ws); | |
675bf4cb | 5689 | |
c65d6b55 PA |
5690 | if (handle_stop_requested (ecs)) |
5691 | return; | |
5692 | ||
ce12b012 PA |
5693 | /* If no catchpoint triggered for this, then keep going. Note |
5694 | that we're interested in knowing the bpstat actually causes a | |
5695 | stop, not just if it may explain the signal. Software | |
5696 | watchpoints, for example, always appear in the bpstat. */ | |
5697 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5698 | { |
5ab2fbf1 | 5699 | bool follow_child |
3e43a32a | 5700 | = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 5701 | |
1edb66d8 | 5702 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
e58b0e63 | 5703 | |
5b6d1e4f PA |
5704 | process_stratum_target *targ |
5705 | = ecs->event_thread->inf->process_target (); | |
5706 | ||
5ab2fbf1 | 5707 | bool should_resume = follow_fork (); |
e58b0e63 | 5708 | |
5b6d1e4f PA |
5709 | /* Note that one of these may be an invalid pointer, |
5710 | depending on detach_fork. */ | |
00431a78 | 5711 | thread_info *parent = ecs->event_thread; |
183be222 | 5712 | thread_info *child = find_thread_ptid (targ, ecs->ws.child_ptid ()); |
6c95b8df | 5713 | |
a2077e25 PA |
5714 | /* At this point, the parent is marked running, and the |
5715 | child is marked stopped. */ | |
5716 | ||
5717 | /* If not resuming the parent, mark it stopped. */ | |
5718 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5719 | parent->set_running (false); |
a2077e25 PA |
5720 | |
5721 | /* If resuming the child, mark it running. */ | |
5722 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5723 | child->set_running (true); |
a2077e25 | 5724 | |
6c95b8df | 5725 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5726 | if (!detach_fork && (non_stop |
5727 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5728 | { |
5729 | if (follow_child) | |
5730 | switch_to_thread (parent); | |
5731 | else | |
5732 | switch_to_thread (child); | |
5733 | ||
5734 | ecs->event_thread = inferior_thread (); | |
5735 | ecs->ptid = inferior_ptid; | |
5736 | keep_going (ecs); | |
5737 | } | |
5738 | ||
5739 | if (follow_child) | |
5740 | switch_to_thread (child); | |
5741 | else | |
5742 | switch_to_thread (parent); | |
5743 | ||
e58b0e63 PA |
5744 | ecs->event_thread = inferior_thread (); |
5745 | ecs->ptid = inferior_ptid; | |
5746 | ||
5747 | if (should_resume) | |
27f9f649 SM |
5748 | { |
5749 | /* Never call switch_back_to_stepped_thread if we are waiting for | |
5750 | vfork-done (waiting for an external vfork child to exec or | |
5751 | exit). We will resume only the vforking thread for the purpose | |
5752 | of collecting the vfork-done event, and we will restart any | |
5753 | step once the critical shared address space window is done. */ | |
5754 | if ((!follow_child | |
5755 | && detach_fork | |
5756 | && parent->inf->thread_waiting_for_vfork_done != nullptr) | |
5757 | || !switch_back_to_stepped_thread (ecs)) | |
5758 | keep_going (ecs); | |
5759 | } | |
e58b0e63 | 5760 | else |
22bcd14b | 5761 | stop_waiting (ecs); |
04e68871 DJ |
5762 | return; |
5763 | } | |
94c57d6a PA |
5764 | process_event_stop_test (ecs); |
5765 | return; | |
488f131b | 5766 | |
6c95b8df PA |
5767 | case TARGET_WAITKIND_VFORK_DONE: |
5768 | /* Done with the shared memory region. Re-insert breakpoints in | |
5769 | the parent, and keep going. */ | |
5770 | ||
00431a78 | 5771 | context_switch (ecs); |
6c95b8df | 5772 | |
d8bbae6e SM |
5773 | handle_vfork_done (ecs->event_thread); |
5774 | gdb_assert (inferior_thread () == ecs->event_thread); | |
c65d6b55 PA |
5775 | |
5776 | if (handle_stop_requested (ecs)) | |
5777 | return; | |
5778 | ||
27f9f649 SM |
5779 | if (!switch_back_to_stepped_thread (ecs)) |
5780 | { | |
5781 | gdb_assert (inferior_thread () == ecs->event_thread); | |
5782 | /* This also takes care of reinserting breakpoints in the | |
5783 | previously locked inferior. */ | |
5784 | keep_going (ecs); | |
5785 | } | |
6c95b8df PA |
5786 | return; |
5787 | ||
488f131b | 5788 | case TARGET_WAITKIND_EXECD: |
488f131b | 5789 | |
cbd2b4e3 PA |
5790 | /* Note we can't read registers yet (the stop_pc), because we |
5791 | don't yet know the inferior's post-exec architecture. | |
5792 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5793 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5794 | |
6c95b8df PA |
5795 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5796 | handle_vfork_child_exec_or_exit (1); | |
5797 | ||
795e548f | 5798 | /* This causes the eventpoints and symbol table to be reset. |
dda83cd7 SM |
5799 | Must do this now, before trying to determine whether to |
5800 | stop. */ | |
183be222 | 5801 | follow_exec (inferior_ptid, ecs->ws.execd_pathname ()); |
795e548f | 5802 | |
17d8546e DB |
5803 | /* In follow_exec we may have deleted the original thread and |
5804 | created a new one. Make sure that the event thread is the | |
5805 | execd thread for that case (this is a nop otherwise). */ | |
5806 | ecs->event_thread = inferior_thread (); | |
5807 | ||
1edb66d8 SM |
5808 | ecs->event_thread->set_stop_pc |
5809 | (regcache_read_pc (get_thread_regcache (ecs->event_thread))); | |
ecdc3a72 | 5810 | |
16c381f0 | 5811 | ecs->event_thread->control.stop_bpstat |
d37e0847 PA |
5812 | = bpstat_stop_status_nowatch (get_current_regcache ()->aspace (), |
5813 | ecs->event_thread->stop_pc (), | |
5814 | ecs->event_thread, ecs->ws); | |
795e548f | 5815 | |
c65d6b55 PA |
5816 | if (handle_stop_requested (ecs)) |
5817 | return; | |
5818 | ||
04e68871 | 5819 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5820 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5821 | { |
1edb66d8 | 5822 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
04e68871 DJ |
5823 | keep_going (ecs); |
5824 | return; | |
5825 | } | |
94c57d6a PA |
5826 | process_event_stop_test (ecs); |
5827 | return; | |
488f131b | 5828 | |
b4dc5ffa | 5829 | /* Be careful not to try to gather much state about a thread |
dda83cd7 | 5830 | that's in a syscall. It's frequently a losing proposition. */ |
488f131b | 5831 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5832 | /* Getting the current syscall number. */ |
94c57d6a PA |
5833 | if (handle_syscall_event (ecs) == 0) |
5834 | process_event_stop_test (ecs); | |
5835 | return; | |
c906108c | 5836 | |
488f131b | 5837 | /* Before examining the threads further, step this thread to |
dda83cd7 SM |
5838 | get it entirely out of the syscall. (We get notice of the |
5839 | event when the thread is just on the verge of exiting a | |
5840 | syscall. Stepping one instruction seems to get it back | |
5841 | into user code.) */ | |
488f131b | 5842 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5843 | if (handle_syscall_event (ecs) == 0) |
5844 | process_event_stop_test (ecs); | |
5845 | return; | |
c906108c | 5846 | |
488f131b | 5847 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5848 | handle_signal_stop (ecs); |
5849 | return; | |
c906108c | 5850 | |
b2175913 MS |
5851 | case TARGET_WAITKIND_NO_HISTORY: |
5852 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5853 | |
d1988021 | 5854 | /* Switch to the stopped thread. */ |
00431a78 | 5855 | context_switch (ecs); |
1eb8556f | 5856 | infrun_debug_printf ("stopped"); |
d1988021 | 5857 | |
34b7e8a6 | 5858 | delete_just_stopped_threads_single_step_breakpoints (); |
1edb66d8 SM |
5859 | ecs->event_thread->set_stop_pc |
5860 | (regcache_read_pc (get_thread_regcache (inferior_thread ()))); | |
c65d6b55 PA |
5861 | |
5862 | if (handle_stop_requested (ecs)) | |
5863 | return; | |
5864 | ||
76727919 | 5865 | gdb::observers::no_history.notify (); |
22bcd14b | 5866 | stop_waiting (ecs); |
b2175913 | 5867 | return; |
488f131b | 5868 | } |
4f5d7f63 PA |
5869 | } |
5870 | ||
372316f1 | 5871 | /* Restart threads back to what they were trying to do back when we |
148cf134 SM |
5872 | paused them (because of an in-line step-over or vfork, for example). |
5873 | The EVENT_THREAD thread is ignored (not restarted). | |
5874 | ||
5875 | If INF is non-nullptr, only resume threads from INF. */ | |
4d9d9d04 PA |
5876 | |
5877 | static void | |
148cf134 | 5878 | restart_threads (struct thread_info *event_thread, inferior *inf) |
372316f1 | 5879 | { |
148cf134 SM |
5880 | INFRUN_SCOPED_DEBUG_START_END ("event_thread=%s, inf=%d", |
5881 | event_thread->ptid.to_string ().c_str (), | |
5882 | inf != nullptr ? inf->num : -1); | |
5883 | ||
2b718529 LS |
5884 | gdb_assert (!step_over_info_valid_p ()); |
5885 | ||
372316f1 PA |
5886 | /* In case the instruction just stepped spawned a new thread. */ |
5887 | update_thread_list (); | |
5888 | ||
08036331 | 5889 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5890 | { |
148cf134 SM |
5891 | if (inf != nullptr && tp->inf != inf) |
5892 | continue; | |
5893 | ||
ac7d717c PA |
5894 | if (tp->inf->detaching) |
5895 | { | |
5896 | infrun_debug_printf ("restart threads: [%s] inferior detaching", | |
0fab7955 | 5897 | tp->ptid.to_string ().c_str ()); |
ac7d717c PA |
5898 | continue; |
5899 | } | |
5900 | ||
f3f8ece4 PA |
5901 | switch_to_thread_no_regs (tp); |
5902 | ||
372316f1 PA |
5903 | if (tp == event_thread) |
5904 | { | |
1eb8556f | 5905 | infrun_debug_printf ("restart threads: [%s] is event thread", |
0fab7955 | 5906 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
5907 | continue; |
5908 | } | |
5909 | ||
5910 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5911 | { | |
1eb8556f | 5912 | infrun_debug_printf ("restart threads: [%s] not meant to be running", |
0fab7955 | 5913 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
5914 | continue; |
5915 | } | |
5916 | ||
7846f3aa | 5917 | if (tp->resumed ()) |
372316f1 | 5918 | { |
1eb8556f | 5919 | infrun_debug_printf ("restart threads: [%s] resumed", |
0fab7955 | 5920 | tp->ptid.to_string ().c_str ()); |
611841bb | 5921 | gdb_assert (tp->executing () || tp->has_pending_waitstatus ()); |
372316f1 PA |
5922 | continue; |
5923 | } | |
5924 | ||
5925 | if (thread_is_in_step_over_chain (tp)) | |
5926 | { | |
1eb8556f | 5927 | infrun_debug_printf ("restart threads: [%s] needs step-over", |
0fab7955 | 5928 | tp->ptid.to_string ().c_str ()); |
7846f3aa | 5929 | gdb_assert (!tp->resumed ()); |
372316f1 PA |
5930 | continue; |
5931 | } | |
5932 | ||
5933 | ||
1edb66d8 | 5934 | if (tp->has_pending_waitstatus ()) |
372316f1 | 5935 | { |
1eb8556f | 5936 | infrun_debug_printf ("restart threads: [%s] has pending status", |
0fab7955 | 5937 | tp->ptid.to_string ().c_str ()); |
7846f3aa | 5938 | tp->set_resumed (true); |
372316f1 PA |
5939 | continue; |
5940 | } | |
5941 | ||
c65d6b55 PA |
5942 | gdb_assert (!tp->stop_requested); |
5943 | ||
372316f1 PA |
5944 | /* If some thread needs to start a step-over at this point, it |
5945 | should still be in the step-over queue, and thus skipped | |
5946 | above. */ | |
5947 | if (thread_still_needs_step_over (tp)) | |
5948 | { | |
5949 | internal_error (__FILE__, __LINE__, | |
5950 | "thread [%s] needs a step-over, but not in " | |
5951 | "step-over queue\n", | |
0fab7955 | 5952 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
5953 | } |
5954 | ||
5955 | if (currently_stepping (tp)) | |
5956 | { | |
1eb8556f | 5957 | infrun_debug_printf ("restart threads: [%s] was stepping", |
0fab7955 | 5958 | tp->ptid.to_string ().c_str ()); |
372316f1 PA |
5959 | keep_going_stepped_thread (tp); |
5960 | } | |
5961 | else | |
5962 | { | |
5963 | struct execution_control_state ecss; | |
5964 | struct execution_control_state *ecs = &ecss; | |
5965 | ||
1eb8556f | 5966 | infrun_debug_printf ("restart threads: [%s] continuing", |
0fab7955 | 5967 | tp->ptid.to_string ().c_str ()); |
372316f1 | 5968 | reset_ecs (ecs, tp); |
00431a78 | 5969 | switch_to_thread (tp); |
372316f1 PA |
5970 | keep_going_pass_signal (ecs); |
5971 | } | |
5972 | } | |
5973 | } | |
5974 | ||
5975 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5976 | a pending waitstatus. */ | |
5977 | ||
5978 | static int | |
5979 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5980 | void *arg) | |
5981 | { | |
1edb66d8 | 5982 | return tp->resumed () && tp->has_pending_waitstatus (); |
372316f1 PA |
5983 | } |
5984 | ||
5985 | /* Called when we get an event that may finish an in-line or | |
5986 | out-of-line (displaced stepping) step-over started previously. | |
5987 | Return true if the event is processed and we should go back to the | |
5988 | event loop; false if the caller should continue processing the | |
5989 | event. */ | |
5990 | ||
5991 | static int | |
4d9d9d04 PA |
5992 | finish_step_over (struct execution_control_state *ecs) |
5993 | { | |
1edb66d8 | 5994 | displaced_step_finish (ecs->event_thread, ecs->event_thread->stop_signal ()); |
4d9d9d04 | 5995 | |
c4464ade | 5996 | bool had_step_over_info = step_over_info_valid_p (); |
372316f1 PA |
5997 | |
5998 | if (had_step_over_info) | |
4d9d9d04 PA |
5999 | { |
6000 | /* If we're stepping over a breakpoint with all threads locked, | |
6001 | then only the thread that was stepped should be reporting | |
6002 | back an event. */ | |
6003 | gdb_assert (ecs->event_thread->control.trap_expected); | |
6004 | ||
c65d6b55 | 6005 | clear_step_over_info (); |
4d9d9d04 PA |
6006 | } |
6007 | ||
fbea99ea | 6008 | if (!target_is_non_stop_p ()) |
372316f1 | 6009 | return 0; |
4d9d9d04 PA |
6010 | |
6011 | /* Start a new step-over in another thread if there's one that | |
6012 | needs it. */ | |
6013 | start_step_over (); | |
372316f1 PA |
6014 | |
6015 | /* If we were stepping over a breakpoint before, and haven't started | |
6016 | a new in-line step-over sequence, then restart all other threads | |
6017 | (except the event thread). We can't do this in all-stop, as then | |
6018 | e.g., we wouldn't be able to issue any other remote packet until | |
6019 | these other threads stop. */ | |
6020 | if (had_step_over_info && !step_over_info_valid_p ()) | |
6021 | { | |
6022 | struct thread_info *pending; | |
6023 | ||
6024 | /* If we only have threads with pending statuses, the restart | |
6025 | below won't restart any thread and so nothing re-inserts the | |
6026 | breakpoint we just stepped over. But we need it inserted | |
6027 | when we later process the pending events, otherwise if | |
6028 | another thread has a pending event for this breakpoint too, | |
6029 | we'd discard its event (because the breakpoint that | |
6030 | originally caused the event was no longer inserted). */ | |
00431a78 | 6031 | context_switch (ecs); |
372316f1 PA |
6032 | insert_breakpoints (); |
6033 | ||
6034 | restart_threads (ecs->event_thread); | |
6035 | ||
6036 | /* If we have events pending, go through handle_inferior_event | |
6037 | again, picking up a pending event at random. This avoids | |
6038 | thread starvation. */ | |
6039 | ||
6040 | /* But not if we just stepped over a watchpoint in order to let | |
6041 | the instruction execute so we can evaluate its expression. | |
6042 | The set of watchpoints that triggered is recorded in the | |
6043 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
6044 | If we processed another event first, that other event could | |
6045 | clobber this info. */ | |
6046 | if (ecs->event_thread->stepping_over_watchpoint) | |
6047 | return 0; | |
6048 | ||
6049 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
6050 | NULL); | |
6051 | if (pending != NULL) | |
6052 | { | |
6053 | struct thread_info *tp = ecs->event_thread; | |
6054 | struct regcache *regcache; | |
6055 | ||
1eb8556f SM |
6056 | infrun_debug_printf ("found resumed threads with " |
6057 | "pending events, saving status"); | |
372316f1 PA |
6058 | |
6059 | gdb_assert (pending != tp); | |
6060 | ||
6061 | /* Record the event thread's event for later. */ | |
c272a98c | 6062 | save_waitstatus (tp, ecs->ws); |
372316f1 PA |
6063 | /* This was cleared early, by handle_inferior_event. Set it |
6064 | so this pending event is considered by | |
6065 | do_target_wait. */ | |
7846f3aa | 6066 | tp->set_resumed (true); |
372316f1 | 6067 | |
611841bb | 6068 | gdb_assert (!tp->executing ()); |
372316f1 | 6069 | |
00431a78 | 6070 | regcache = get_thread_regcache (tp); |
1edb66d8 | 6071 | tp->set_stop_pc (regcache_read_pc (regcache)); |
372316f1 | 6072 | |
1eb8556f SM |
6073 | infrun_debug_printf ("saved stop_pc=%s for %s " |
6074 | "(currently_stepping=%d)", | |
1edb66d8 | 6075 | paddress (target_gdbarch (), tp->stop_pc ()), |
0fab7955 | 6076 | tp->ptid.to_string ().c_str (), |
1eb8556f | 6077 | currently_stepping (tp)); |
372316f1 PA |
6078 | |
6079 | /* This in-line step-over finished; clear this so we won't | |
6080 | start a new one. This is what handle_signal_stop would | |
6081 | do, if we returned false. */ | |
6082 | tp->stepping_over_breakpoint = 0; | |
6083 | ||
6084 | /* Wake up the event loop again. */ | |
6085 | mark_async_event_handler (infrun_async_inferior_event_token); | |
6086 | ||
6087 | prepare_to_wait (ecs); | |
6088 | return 1; | |
6089 | } | |
6090 | } | |
6091 | ||
6092 | return 0; | |
4d9d9d04 PA |
6093 | } |
6094 | ||
4f5d7f63 PA |
6095 | /* Come here when the program has stopped with a signal. */ |
6096 | ||
6097 | static void | |
6098 | handle_signal_stop (struct execution_control_state *ecs) | |
6099 | { | |
6100 | struct frame_info *frame; | |
6101 | struct gdbarch *gdbarch; | |
6102 | int stopped_by_watchpoint; | |
6103 | enum stop_kind stop_soon; | |
6104 | int random_signal; | |
c906108c | 6105 | |
183be222 | 6106 | gdb_assert (ecs->ws.kind () == TARGET_WAITKIND_STOPPED); |
f0407826 | 6107 | |
183be222 | 6108 | ecs->event_thread->set_stop_signal (ecs->ws.sig ()); |
c65d6b55 | 6109 | |
f0407826 DE |
6110 | /* Do we need to clean up the state of a thread that has |
6111 | completed a displaced single-step? (Doing so usually affects | |
6112 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
6113 | if (finish_step_over (ecs)) |
6114 | return; | |
f0407826 DE |
6115 | |
6116 | /* If we either finished a single-step or hit a breakpoint, but | |
6117 | the user wanted this thread to be stopped, pretend we got a | |
6118 | SIG0 (generic unsignaled stop). */ | |
6119 | if (ecs->event_thread->stop_requested | |
1edb66d8 SM |
6120 | && ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP) |
6121 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
237fc4c9 | 6122 | |
1edb66d8 SM |
6123 | ecs->event_thread->set_stop_pc |
6124 | (regcache_read_pc (get_thread_regcache (ecs->event_thread))); | |
488f131b | 6125 | |
2ab76a18 PA |
6126 | context_switch (ecs); |
6127 | ||
6128 | if (deprecated_context_hook) | |
6129 | deprecated_context_hook (ecs->event_thread->global_num); | |
6130 | ||
527159b7 | 6131 | if (debug_infrun) |
237fc4c9 | 6132 | { |
00431a78 | 6133 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 6134 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 6135 | |
1edb66d8 SM |
6136 | infrun_debug_printf |
6137 | ("stop_pc=%s", paddress (reg_gdbarch, ecs->event_thread->stop_pc ())); | |
d92524f1 | 6138 | if (target_stopped_by_watchpoint ()) |
237fc4c9 | 6139 | { |
dda83cd7 | 6140 | CORE_ADDR addr; |
abbb1732 | 6141 | |
1eb8556f | 6142 | infrun_debug_printf ("stopped by watchpoint"); |
237fc4c9 | 6143 | |
328d42d8 SM |
6144 | if (target_stopped_data_address (current_inferior ()->top_target (), |
6145 | &addr)) | |
1eb8556f | 6146 | infrun_debug_printf ("stopped data address=%s", |
dda83cd7 SM |
6147 | paddress (reg_gdbarch, addr)); |
6148 | else | |
1eb8556f | 6149 | infrun_debug_printf ("(no data address available)"); |
237fc4c9 PA |
6150 | } |
6151 | } | |
527159b7 | 6152 | |
36fa8042 PA |
6153 | /* This is originated from start_remote(), start_inferior() and |
6154 | shared libraries hook functions. */ | |
00431a78 | 6155 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
6156 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
6157 | { | |
1eb8556f | 6158 | infrun_debug_printf ("quietly stopped"); |
c4464ade | 6159 | stop_print_frame = true; |
22bcd14b | 6160 | stop_waiting (ecs); |
36fa8042 PA |
6161 | return; |
6162 | } | |
6163 | ||
36fa8042 PA |
6164 | /* This originates from attach_command(). We need to overwrite |
6165 | the stop_signal here, because some kernels don't ignore a | |
6166 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
6167 | See more comments in inferior.h. On the other hand, if we | |
6168 | get a non-SIGSTOP, report it to the user - assume the backend | |
6169 | will handle the SIGSTOP if it should show up later. | |
6170 | ||
6171 | Also consider that the attach is complete when we see a | |
6172 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
6173 | target extended-remote report it instead of a SIGSTOP | |
6174 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
6175 | signal, so this is no exception. | |
6176 | ||
6177 | Also consider that the attach is complete when we see a | |
6178 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
6179 | the target to stop all threads of the inferior, in case the | |
6180 | low level attach operation doesn't stop them implicitly. If | |
6181 | they weren't stopped implicitly, then the stub will report a | |
6182 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
6183 | other than GDB's request. */ | |
6184 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
1edb66d8 SM |
6185 | && (ecs->event_thread->stop_signal () == GDB_SIGNAL_STOP |
6186 | || ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP | |
6187 | || ecs->event_thread->stop_signal () == GDB_SIGNAL_0)) | |
36fa8042 | 6188 | { |
c4464ade | 6189 | stop_print_frame = true; |
22bcd14b | 6190 | stop_waiting (ecs); |
1edb66d8 | 6191 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
36fa8042 PA |
6192 | return; |
6193 | } | |
6194 | ||
568d6575 UW |
6195 | /* At this point, get hold of the now-current thread's frame. */ |
6196 | frame = get_current_frame (); | |
6197 | gdbarch = get_frame_arch (frame); | |
6198 | ||
2adfaa28 | 6199 | /* Pull the single step breakpoints out of the target. */ |
1edb66d8 | 6200 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP) |
488f131b | 6201 | { |
af48d08f | 6202 | struct regcache *regcache; |
af48d08f | 6203 | CORE_ADDR pc; |
2adfaa28 | 6204 | |
00431a78 | 6205 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
6206 | const address_space *aspace = regcache->aspace (); |
6207 | ||
af48d08f | 6208 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 6209 | |
af48d08f PA |
6210 | /* However, before doing so, if this single-step breakpoint was |
6211 | actually for another thread, set this thread up for moving | |
6212 | past it. */ | |
6213 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
6214 | aspace, pc)) | |
6215 | { | |
6216 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 | 6217 | { |
1eb8556f SM |
6218 | infrun_debug_printf ("[%s] hit another thread's single-step " |
6219 | "breakpoint", | |
0fab7955 | 6220 | ecs->ptid.to_string ().c_str ()); |
af48d08f PA |
6221 | ecs->hit_singlestep_breakpoint = 1; |
6222 | } | |
6223 | } | |
6224 | else | |
6225 | { | |
1eb8556f | 6226 | infrun_debug_printf ("[%s] hit its single-step breakpoint", |
0fab7955 | 6227 | ecs->ptid.to_string ().c_str ()); |
2adfaa28 | 6228 | } |
488f131b | 6229 | } |
af48d08f | 6230 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 6231 | |
1edb66d8 | 6232 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
963f9c80 PA |
6233 | && ecs->event_thread->control.trap_expected |
6234 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
6235 | stopped_by_watchpoint = 0; |
6236 | else | |
c272a98c | 6237 | stopped_by_watchpoint = watchpoints_triggered (ecs->ws); |
d983da9c DJ |
6238 | |
6239 | /* If necessary, step over this watchpoint. We'll be back to display | |
6240 | it in a moment. */ | |
6241 | if (stopped_by_watchpoint | |
9aed480c | 6242 | && (target_have_steppable_watchpoint () |
568d6575 | 6243 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 6244 | { |
488f131b | 6245 | /* At this point, we are stopped at an instruction which has |
dda83cd7 SM |
6246 | attempted to write to a piece of memory under control of |
6247 | a watchpoint. The instruction hasn't actually executed | |
6248 | yet. If we were to evaluate the watchpoint expression | |
6249 | now, we would get the old value, and therefore no change | |
6250 | would seem to have occurred. | |
6251 | ||
6252 | In order to make watchpoints work `right', we really need | |
6253 | to complete the memory write, and then evaluate the | |
6254 | watchpoint expression. We do this by single-stepping the | |
d983da9c DJ |
6255 | target. |
6256 | ||
7f89fd65 | 6257 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
6258 | it. For example, the PA can (with some kernel cooperation) |
6259 | single step over a watchpoint without disabling the watchpoint. | |
6260 | ||
6261 | It is far more common to need to disable a watchpoint to step | |
6262 | the inferior over it. If we have non-steppable watchpoints, | |
6263 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
6264 | disable all watchpoints. |
6265 | ||
6266 | Any breakpoint at PC must also be stepped over -- if there's | |
6267 | one, it will have already triggered before the watchpoint | |
6268 | triggered, and we either already reported it to the user, or | |
6269 | it didn't cause a stop and we called keep_going. In either | |
6270 | case, if there was a breakpoint at PC, we must be trying to | |
6271 | step past it. */ | |
6272 | ecs->event_thread->stepping_over_watchpoint = 1; | |
6273 | keep_going (ecs); | |
488f131b JB |
6274 | return; |
6275 | } | |
6276 | ||
4e1c45ea | 6277 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 6278 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
6279 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
6280 | ecs->event_thread->control.stop_step = 0; | |
c4464ade | 6281 | stop_print_frame = true; |
488f131b | 6282 | stopped_by_random_signal = 0; |
313f3b21 | 6283 | bpstat *stop_chain = nullptr; |
488f131b | 6284 | |
edb3359d DJ |
6285 | /* Hide inlined functions starting here, unless we just performed stepi or |
6286 | nexti. After stepi and nexti, always show the innermost frame (not any | |
6287 | inline function call sites). */ | |
16c381f0 | 6288 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 6289 | { |
00431a78 PA |
6290 | const address_space *aspace |
6291 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
6292 | |
6293 | /* skip_inline_frames is expensive, so we avoid it if we can | |
6294 | determine that the address is one where functions cannot have | |
6295 | been inlined. This improves performance with inferiors that | |
6296 | load a lot of shared libraries, because the solib event | |
6297 | breakpoint is defined as the address of a function (i.e. not | |
6298 | inline). Note that we have to check the previous PC as well | |
6299 | as the current one to catch cases when we have just | |
6300 | single-stepped off a breakpoint prior to reinstating it. | |
6301 | Note that we're assuming that the code we single-step to is | |
6302 | not inline, but that's not definitive: there's nothing | |
6303 | preventing the event breakpoint function from containing | |
6304 | inlined code, and the single-step ending up there. If the | |
6305 | user had set a breakpoint on that inlined code, the missing | |
6306 | skip_inline_frames call would break things. Fortunately | |
6307 | that's an extremely unlikely scenario. */ | |
f2ffa92b | 6308 | if (!pc_at_non_inline_function (aspace, |
1edb66d8 | 6309 | ecs->event_thread->stop_pc (), |
c272a98c | 6310 | ecs->ws) |
1edb66d8 | 6311 | && !(ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
a210c238 MR |
6312 | && ecs->event_thread->control.trap_expected |
6313 | && pc_at_non_inline_function (aspace, | |
6314 | ecs->event_thread->prev_pc, | |
c272a98c | 6315 | ecs->ws))) |
1c5a993e | 6316 | { |
f2ffa92b | 6317 | stop_chain = build_bpstat_chain (aspace, |
1edb66d8 | 6318 | ecs->event_thread->stop_pc (), |
c272a98c | 6319 | ecs->ws); |
00431a78 | 6320 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
6321 | |
6322 | /* Re-fetch current thread's frame in case that invalidated | |
6323 | the frame cache. */ | |
6324 | frame = get_current_frame (); | |
6325 | gdbarch = get_frame_arch (frame); | |
6326 | } | |
0574c78f | 6327 | } |
edb3359d | 6328 | |
1edb66d8 | 6329 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
16c381f0 | 6330 | && ecs->event_thread->control.trap_expected |
568d6575 | 6331 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6332 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6333 | { |
b50d7442 | 6334 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6335 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6336 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6337 | with a delay slot. It needs to be stepped twice, once for |
6338 | the instruction and once for the delay slot. */ | |
6339 | int step_through_delay | |
568d6575 | 6340 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6341 | |
1eb8556f SM |
6342 | if (step_through_delay) |
6343 | infrun_debug_printf ("step through delay"); | |
6344 | ||
16c381f0 JK |
6345 | if (ecs->event_thread->control.step_range_end == 0 |
6346 | && step_through_delay) | |
3352ef37 AC |
6347 | { |
6348 | /* The user issued a continue when stopped at a breakpoint. | |
6349 | Set up for another trap and get out of here. */ | |
dda83cd7 SM |
6350 | ecs->event_thread->stepping_over_breakpoint = 1; |
6351 | keep_going (ecs); | |
6352 | return; | |
3352ef37 AC |
6353 | } |
6354 | else if (step_through_delay) | |
6355 | { | |
6356 | /* The user issued a step when stopped at a breakpoint. | |
6357 | Maybe we should stop, maybe we should not - the delay | |
6358 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6359 | case, don't decide that here, just set |
6360 | ecs->stepping_over_breakpoint, making sure we | |
6361 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6362 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6363 | } |
6364 | } | |
6365 | ||
ab04a2af TT |
6366 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6367 | handles this event. */ | |
6368 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6369 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
1edb66d8 | 6370 | ecs->event_thread->stop_pc (), |
c272a98c | 6371 | ecs->event_thread, ecs->ws, stop_chain); |
db82e815 | 6372 | |
ab04a2af TT |
6373 | /* Following in case break condition called a |
6374 | function. */ | |
c4464ade | 6375 | stop_print_frame = true; |
73dd234f | 6376 | |
ab04a2af TT |
6377 | /* This is where we handle "moribund" watchpoints. Unlike |
6378 | software breakpoints traps, hardware watchpoint traps are | |
6379 | always distinguishable from random traps. If no high-level | |
6380 | watchpoint is associated with the reported stop data address | |
6381 | anymore, then the bpstat does not explain the signal --- | |
6382 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6383 | set. */ | |
6384 | ||
1edb66d8 | 6385 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
47591c29 | 6386 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6387 | GDB_SIGNAL_TRAP) |
ab04a2af | 6388 | && stopped_by_watchpoint) |
1eb8556f SM |
6389 | { |
6390 | infrun_debug_printf ("no user watchpoint explains watchpoint SIGTRAP, " | |
6391 | "ignoring"); | |
6392 | } | |
73dd234f | 6393 | |
bac7d97b | 6394 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6395 | at one stage in the past included checks for an inferior |
6396 | function call's call dummy's return breakpoint. The original | |
6397 | comment, that went with the test, read: | |
03cebad2 | 6398 | |
ab04a2af TT |
6399 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6400 | another signal besides SIGTRAP, so check here as well as | |
6401 | above.'' | |
73dd234f | 6402 | |
ab04a2af TT |
6403 | If someone ever tries to get call dummys on a |
6404 | non-executable stack to work (where the target would stop | |
6405 | with something like a SIGSEGV), then those tests might need | |
6406 | to be re-instated. Given, however, that the tests were only | |
6407 | enabled when momentary breakpoints were not being used, I | |
6408 | suspect that it won't be the case. | |
488f131b | 6409 | |
ab04a2af TT |
6410 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6411 | be necessary for call dummies on a non-executable stack on | |
6412 | SPARC. */ | |
488f131b | 6413 | |
bac7d97b | 6414 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6415 | random_signal |
6416 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
1edb66d8 | 6417 | ecs->event_thread->stop_signal ()); |
bac7d97b | 6418 | |
1cf4d951 PA |
6419 | /* Maybe this was a trap for a software breakpoint that has since |
6420 | been removed. */ | |
6421 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6422 | { | |
5133a315 | 6423 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
1edb66d8 | 6424 | ecs->event_thread->stop_pc ())) |
1cf4d951 PA |
6425 | { |
6426 | struct regcache *regcache; | |
6427 | int decr_pc; | |
6428 | ||
6429 | /* Re-adjust PC to what the program would see if GDB was not | |
6430 | debugging it. */ | |
00431a78 | 6431 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6432 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6433 | if (decr_pc != 0) |
6434 | { | |
07036511 TT |
6435 | gdb::optional<scoped_restore_tmpl<int>> |
6436 | restore_operation_disable; | |
1cf4d951 PA |
6437 | |
6438 | if (record_full_is_used ()) | |
07036511 TT |
6439 | restore_operation_disable.emplace |
6440 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6441 | |
f2ffa92b | 6442 | regcache_write_pc (regcache, |
1edb66d8 | 6443 | ecs->event_thread->stop_pc () + decr_pc); |
1cf4d951 PA |
6444 | } |
6445 | } | |
6446 | else | |
6447 | { | |
6448 | /* A delayed software breakpoint event. Ignore the trap. */ | |
1eb8556f | 6449 | infrun_debug_printf ("delayed software breakpoint trap, ignoring"); |
1cf4d951 PA |
6450 | random_signal = 0; |
6451 | } | |
6452 | } | |
6453 | ||
6454 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6455 | has since been removed. */ | |
6456 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6457 | { | |
6458 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
1eb8556f SM |
6459 | infrun_debug_printf ("delayed hardware breakpoint/watchpoint " |
6460 | "trap, ignoring"); | |
1cf4d951 PA |
6461 | random_signal = 0; |
6462 | } | |
6463 | ||
bac7d97b PA |
6464 | /* If not, perhaps stepping/nexting can. */ |
6465 | if (random_signal) | |
1edb66d8 | 6466 | random_signal = !(ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
bac7d97b | 6467 | && currently_stepping (ecs->event_thread)); |
ab04a2af | 6468 | |
2adfaa28 PA |
6469 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6470 | thread. Single-step breakpoints are transparent to the | |
6471 | breakpoints module. */ | |
6472 | if (random_signal) | |
6473 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6474 | ||
bac7d97b PA |
6475 | /* No? Perhaps we got a moribund watchpoint. */ |
6476 | if (random_signal) | |
6477 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6478 | |
c65d6b55 PA |
6479 | /* Always stop if the user explicitly requested this thread to |
6480 | remain stopped. */ | |
6481 | if (ecs->event_thread->stop_requested) | |
6482 | { | |
6483 | random_signal = 1; | |
1eb8556f | 6484 | infrun_debug_printf ("user-requested stop"); |
c65d6b55 PA |
6485 | } |
6486 | ||
488f131b JB |
6487 | /* For the program's own signals, act according to |
6488 | the signal handling tables. */ | |
6489 | ||
ce12b012 | 6490 | if (random_signal) |
488f131b JB |
6491 | { |
6492 | /* Signal not for debugging purposes. */ | |
1edb66d8 | 6493 | enum gdb_signal stop_signal = ecs->event_thread->stop_signal (); |
488f131b | 6494 | |
1eb8556f SM |
6495 | infrun_debug_printf ("random signal (%s)", |
6496 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6497 | |
488f131b JB |
6498 | stopped_by_random_signal = 1; |
6499 | ||
252fbfc8 PA |
6500 | /* Always stop on signals if we're either just gaining control |
6501 | of the program, or the user explicitly requested this thread | |
6502 | to remain stopped. */ | |
d6b48e9c | 6503 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6504 | || ecs->event_thread->stop_requested |
1edb66d8 | 6505 | || signal_stop_state (ecs->event_thread->stop_signal ())) |
488f131b | 6506 | { |
22bcd14b | 6507 | stop_waiting (ecs); |
488f131b JB |
6508 | return; |
6509 | } | |
b57bacec PA |
6510 | |
6511 | /* Notify observers the signal has "handle print" set. Note we | |
6512 | returned early above if stopping; normal_stop handles the | |
6513 | printing in that case. */ | |
1edb66d8 | 6514 | if (signal_print[ecs->event_thread->stop_signal ()]) |
b57bacec PA |
6515 | { |
6516 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6517 | target_terminal::ours_for_output (); |
1edb66d8 | 6518 | gdb::observers::signal_received.notify (ecs->event_thread->stop_signal ()); |
223ffa71 | 6519 | target_terminal::inferior (); |
b57bacec | 6520 | } |
488f131b JB |
6521 | |
6522 | /* Clear the signal if it should not be passed. */ | |
1edb66d8 SM |
6523 | if (signal_program[ecs->event_thread->stop_signal ()] == 0) |
6524 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
488f131b | 6525 | |
1edb66d8 | 6526 | if (ecs->event_thread->prev_pc == ecs->event_thread->stop_pc () |
16c381f0 | 6527 | && ecs->event_thread->control.trap_expected |
8358c15c | 6528 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6529 | { |
6530 | /* We were just starting a new sequence, attempting to | |
6531 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6532 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6533 | of the stepping range so GDB needs to remember to, when |
6534 | the signal handler returns, resume stepping off that | |
6535 | breakpoint. */ | |
6536 | /* To simplify things, "continue" is forced to use the same | |
6537 | code paths as single-step - set a breakpoint at the | |
6538 | signal return address and then, once hit, step off that | |
6539 | breakpoint. */ | |
1eb8556f | 6540 | infrun_debug_printf ("signal arrived while stepping over breakpoint"); |
d3169d93 | 6541 | |
2c03e5be | 6542 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6543 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6544 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6545 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6546 | |
6547 | /* If we were nexting/stepping some other thread, switch to | |
6548 | it, so that we don't continue it, losing control. */ | |
6549 | if (!switch_back_to_stepped_thread (ecs)) | |
6550 | keep_going (ecs); | |
9d799f85 | 6551 | return; |
68f53502 | 6552 | } |
9d799f85 | 6553 | |
1edb66d8 SM |
6554 | if (ecs->event_thread->stop_signal () != GDB_SIGNAL_0 |
6555 | && (pc_in_thread_step_range (ecs->event_thread->stop_pc (), | |
f2ffa92b | 6556 | ecs->event_thread) |
e5f8a7cc | 6557 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 6558 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6559 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6560 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6561 | { |
6562 | /* The inferior is about to take a signal that will take it | |
6563 | out of the single step range. Set a breakpoint at the | |
6564 | current PC (which is presumably where the signal handler | |
6565 | will eventually return) and then allow the inferior to | |
6566 | run free. | |
6567 | ||
6568 | Note that this is only needed for a signal delivered | |
6569 | while in the single-step range. Nested signals aren't a | |
6570 | problem as they eventually all return. */ | |
1eb8556f | 6571 | infrun_debug_printf ("signal may take us out of single-step range"); |
237fc4c9 | 6572 | |
372316f1 | 6573 | clear_step_over_info (); |
2c03e5be | 6574 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6575 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6576 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6577 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6578 | keep_going (ecs); |
6579 | return; | |
d303a6c7 | 6580 | } |
9d799f85 | 6581 | |
85102364 | 6582 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6583 | when either there's a nested signal, or when there's a |
6584 | pending signal enabled just as the signal handler returns | |
6585 | (leaving the inferior at the step-resume-breakpoint without | |
6586 | actually executing it). Either way continue until the | |
6587 | breakpoint is really hit. */ | |
c447ac0b PA |
6588 | |
6589 | if (!switch_back_to_stepped_thread (ecs)) | |
6590 | { | |
1eb8556f | 6591 | infrun_debug_printf ("random signal, keep going"); |
c447ac0b PA |
6592 | |
6593 | keep_going (ecs); | |
6594 | } | |
6595 | return; | |
488f131b | 6596 | } |
94c57d6a PA |
6597 | |
6598 | process_event_stop_test (ecs); | |
6599 | } | |
6600 | ||
6601 | /* Come here when we've got some debug event / signal we can explain | |
6602 | (IOW, not a random signal), and test whether it should cause a | |
6603 | stop, or whether we should resume the inferior (transparently). | |
6604 | E.g., could be a breakpoint whose condition evaluates false; we | |
6605 | could be still stepping within the line; etc. */ | |
6606 | ||
6607 | static void | |
6608 | process_event_stop_test (struct execution_control_state *ecs) | |
6609 | { | |
6610 | struct symtab_and_line stop_pc_sal; | |
6611 | struct frame_info *frame; | |
6612 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6613 | CORE_ADDR jmp_buf_pc; |
6614 | struct bpstat_what what; | |
94c57d6a | 6615 | |
cdaa5b73 | 6616 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6617 | |
cdaa5b73 PA |
6618 | frame = get_current_frame (); |
6619 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6620 | |
cdaa5b73 | 6621 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6622 | |
cdaa5b73 PA |
6623 | if (what.call_dummy) |
6624 | { | |
6625 | stop_stack_dummy = what.call_dummy; | |
6626 | } | |
186c406b | 6627 | |
243a9253 PA |
6628 | /* A few breakpoint types have callbacks associated (e.g., |
6629 | bp_jit_event). Run them now. */ | |
6630 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6631 | ||
cdaa5b73 PA |
6632 | /* If we hit an internal event that triggers symbol changes, the |
6633 | current frame will be invalidated within bpstat_what (e.g., if we | |
6634 | hit an internal solib event). Re-fetch it. */ | |
6635 | frame = get_current_frame (); | |
6636 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6637 | |
cdaa5b73 PA |
6638 | switch (what.main_action) |
6639 | { | |
6640 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6641 | /* If we hit the breakpoint at longjmp while stepping, we | |
6642 | install a momentary breakpoint at the target of the | |
6643 | jmp_buf. */ | |
186c406b | 6644 | |
1eb8556f | 6645 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME"); |
186c406b | 6646 | |
cdaa5b73 | 6647 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6648 | |
cdaa5b73 PA |
6649 | if (what.is_longjmp) |
6650 | { | |
6651 | struct value *arg_value; | |
6652 | ||
6653 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6654 | then use it to extract the arguments. The destination PC | |
6655 | is the third argument to the probe. */ | |
6656 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6657 | if (arg_value) | |
8fa0c4f8 AA |
6658 | { |
6659 | jmp_buf_pc = value_as_address (arg_value); | |
6660 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6661 | } | |
cdaa5b73 PA |
6662 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6663 | || !gdbarch_get_longjmp_target (gdbarch, | |
6664 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6665 | { |
1eb8556f SM |
6666 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME " |
6667 | "(!gdbarch_get_longjmp_target)"); | |
cdaa5b73 PA |
6668 | keep_going (ecs); |
6669 | return; | |
e2e4d78b | 6670 | } |
e2e4d78b | 6671 | |
cdaa5b73 PA |
6672 | /* Insert a breakpoint at resume address. */ |
6673 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6674 | } | |
6675 | else | |
6676 | check_exception_resume (ecs, frame); | |
6677 | keep_going (ecs); | |
6678 | return; | |
e81a37f7 | 6679 | |
cdaa5b73 PA |
6680 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6681 | { | |
6682 | struct frame_info *init_frame; | |
e81a37f7 | 6683 | |
cdaa5b73 | 6684 | /* There are several cases to consider. |
c906108c | 6685 | |
cdaa5b73 PA |
6686 | 1. The initiating frame no longer exists. In this case we |
6687 | must stop, because the exception or longjmp has gone too | |
6688 | far. | |
2c03e5be | 6689 | |
cdaa5b73 PA |
6690 | 2. The initiating frame exists, and is the same as the |
6691 | current frame. We stop, because the exception or longjmp | |
6692 | has been caught. | |
2c03e5be | 6693 | |
cdaa5b73 PA |
6694 | 3. The initiating frame exists and is different from the |
6695 | current frame. This means the exception or longjmp has | |
6696 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6697 | |
cdaa5b73 PA |
6698 | 4. longjmp breakpoint has been placed just to protect |
6699 | against stale dummy frames and user is not interested in | |
6700 | stopping around longjmps. */ | |
c5aa993b | 6701 | |
1eb8556f | 6702 | infrun_debug_printf ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME"); |
c5aa993b | 6703 | |
cdaa5b73 PA |
6704 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6705 | != NULL); | |
6706 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6707 | |
cdaa5b73 PA |
6708 | if (what.is_longjmp) |
6709 | { | |
b67a2c6f | 6710 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6711 | |
cdaa5b73 | 6712 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6713 | { |
cdaa5b73 PA |
6714 | /* Case 4. */ |
6715 | keep_going (ecs); | |
6716 | return; | |
e5ef252a | 6717 | } |
cdaa5b73 | 6718 | } |
c5aa993b | 6719 | |
cdaa5b73 | 6720 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6721 | |
cdaa5b73 PA |
6722 | if (init_frame) |
6723 | { | |
6724 | struct frame_id current_id | |
6725 | = get_frame_id (get_current_frame ()); | |
6726 | if (frame_id_eq (current_id, | |
6727 | ecs->event_thread->initiating_frame)) | |
6728 | { | |
6729 | /* Case 2. Fall through. */ | |
6730 | } | |
6731 | else | |
6732 | { | |
6733 | /* Case 3. */ | |
6734 | keep_going (ecs); | |
6735 | return; | |
6736 | } | |
68f53502 | 6737 | } |
488f131b | 6738 | |
cdaa5b73 PA |
6739 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6740 | exists. */ | |
6741 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6742 | |
bdc36728 | 6743 | end_stepping_range (ecs); |
cdaa5b73 PA |
6744 | } |
6745 | return; | |
e5ef252a | 6746 | |
cdaa5b73 | 6747 | case BPSTAT_WHAT_SINGLE: |
1eb8556f | 6748 | infrun_debug_printf ("BPSTAT_WHAT_SINGLE"); |
cdaa5b73 PA |
6749 | ecs->event_thread->stepping_over_breakpoint = 1; |
6750 | /* Still need to check other stuff, at least the case where we | |
6751 | are stepping and step out of the right range. */ | |
6752 | break; | |
e5ef252a | 6753 | |
cdaa5b73 | 6754 | case BPSTAT_WHAT_STEP_RESUME: |
1eb8556f | 6755 | infrun_debug_printf ("BPSTAT_WHAT_STEP_RESUME"); |
e5ef252a | 6756 | |
cdaa5b73 PA |
6757 | delete_step_resume_breakpoint (ecs->event_thread); |
6758 | if (ecs->event_thread->control.proceed_to_finish | |
6759 | && execution_direction == EXEC_REVERSE) | |
6760 | { | |
6761 | struct thread_info *tp = ecs->event_thread; | |
6762 | ||
6763 | /* We are finishing a function in reverse, and just hit the | |
6764 | step-resume breakpoint at the start address of the | |
6765 | function, and we're almost there -- just need to back up | |
6766 | by one more single-step, which should take us back to the | |
6767 | function call. */ | |
6768 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6769 | keep_going (ecs); | |
e5ef252a | 6770 | return; |
cdaa5b73 PA |
6771 | } |
6772 | fill_in_stop_func (gdbarch, ecs); | |
1edb66d8 | 6773 | if (ecs->event_thread->stop_pc () == ecs->stop_func_start |
cdaa5b73 PA |
6774 | && execution_direction == EXEC_REVERSE) |
6775 | { | |
6776 | /* We are stepping over a function call in reverse, and just | |
6777 | hit the step-resume breakpoint at the start address of | |
6778 | the function. Go back to single-stepping, which should | |
6779 | take us back to the function call. */ | |
6780 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6781 | keep_going (ecs); | |
6782 | return; | |
6783 | } | |
6784 | break; | |
e5ef252a | 6785 | |
cdaa5b73 | 6786 | case BPSTAT_WHAT_STOP_NOISY: |
1eb8556f | 6787 | infrun_debug_printf ("BPSTAT_WHAT_STOP_NOISY"); |
c4464ade | 6788 | stop_print_frame = true; |
e5ef252a | 6789 | |
33bf4c5c | 6790 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6791 | whether a/the breakpoint is there when the thread is next |
6792 | resumed. */ | |
6793 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6794 | |
22bcd14b | 6795 | stop_waiting (ecs); |
cdaa5b73 | 6796 | return; |
e5ef252a | 6797 | |
cdaa5b73 | 6798 | case BPSTAT_WHAT_STOP_SILENT: |
1eb8556f | 6799 | infrun_debug_printf ("BPSTAT_WHAT_STOP_SILENT"); |
c4464ade | 6800 | stop_print_frame = false; |
e5ef252a | 6801 | |
33bf4c5c | 6802 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6803 | whether a/the breakpoint is there when the thread is next |
6804 | resumed. */ | |
6805 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6806 | stop_waiting (ecs); |
cdaa5b73 PA |
6807 | return; |
6808 | ||
6809 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
1eb8556f | 6810 | infrun_debug_printf ("BPSTAT_WHAT_HP_STEP_RESUME"); |
cdaa5b73 PA |
6811 | |
6812 | delete_step_resume_breakpoint (ecs->event_thread); | |
6813 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6814 | { | |
6815 | /* Back when the step-resume breakpoint was inserted, we | |
6816 | were trying to single-step off a breakpoint. Go back to | |
6817 | doing that. */ | |
6818 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6819 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6820 | keep_going (ecs); | |
6821 | return; | |
e5ef252a | 6822 | } |
cdaa5b73 PA |
6823 | break; |
6824 | ||
6825 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6826 | break; | |
e5ef252a | 6827 | } |
c906108c | 6828 | |
af48d08f PA |
6829 | /* If we stepped a permanent breakpoint and we had a high priority |
6830 | step-resume breakpoint for the address we stepped, but we didn't | |
6831 | hit it, then we must have stepped into the signal handler. The | |
6832 | step-resume was only necessary to catch the case of _not_ | |
6833 | stepping into the handler, so delete it, and fall through to | |
6834 | checking whether the step finished. */ | |
6835 | if (ecs->event_thread->stepped_breakpoint) | |
6836 | { | |
6837 | struct breakpoint *sr_bp | |
6838 | = ecs->event_thread->control.step_resume_breakpoint; | |
6839 | ||
8d707a12 PA |
6840 | if (sr_bp != NULL |
6841 | && sr_bp->loc->permanent | |
af48d08f PA |
6842 | && sr_bp->type == bp_hp_step_resume |
6843 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6844 | { | |
1eb8556f | 6845 | infrun_debug_printf ("stepped permanent breakpoint, stopped in handler"); |
af48d08f PA |
6846 | delete_step_resume_breakpoint (ecs->event_thread); |
6847 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6848 | } | |
6849 | } | |
6850 | ||
cdaa5b73 PA |
6851 | /* We come here if we hit a breakpoint but should not stop for it. |
6852 | Possibly we also were stepping and should stop for that. So fall | |
6853 | through and test for stepping. But, if not stepping, do not | |
6854 | stop. */ | |
c906108c | 6855 | |
a7212384 UW |
6856 | /* In all-stop mode, if we're currently stepping but have stopped in |
6857 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6858 | if (switch_back_to_stepped_thread (ecs)) |
6859 | return; | |
776f04fa | 6860 | |
8358c15c | 6861 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6862 | { |
1eb8556f | 6863 | infrun_debug_printf ("step-resume breakpoint is inserted"); |
527159b7 | 6864 | |
488f131b | 6865 | /* Having a step-resume breakpoint overrides anything |
dda83cd7 SM |
6866 | else having to do with stepping commands until |
6867 | that breakpoint is reached. */ | |
488f131b JB |
6868 | keep_going (ecs); |
6869 | return; | |
6870 | } | |
c5aa993b | 6871 | |
16c381f0 | 6872 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6873 | { |
1eb8556f | 6874 | infrun_debug_printf ("no stepping, continue"); |
488f131b | 6875 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6876 | keep_going (ecs); |
6877 | return; | |
6878 | } | |
c5aa993b | 6879 | |
4b7703ad JB |
6880 | /* Re-fetch current thread's frame in case the code above caused |
6881 | the frame cache to be re-initialized, making our FRAME variable | |
6882 | a dangling pointer. */ | |
6883 | frame = get_current_frame (); | |
628fe4e4 | 6884 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6885 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6886 | |
488f131b | 6887 | /* If stepping through a line, keep going if still within it. |
c906108c | 6888 | |
488f131b JB |
6889 | Note that step_range_end is the address of the first instruction |
6890 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6891 | within it! |
6892 | ||
6893 | Note also that during reverse execution, we may be stepping | |
6894 | through a function epilogue and therefore must detect when | |
6895 | the current-frame changes in the middle of a line. */ | |
6896 | ||
1edb66d8 | 6897 | if (pc_in_thread_step_range (ecs->event_thread->stop_pc (), |
f2ffa92b | 6898 | ecs->event_thread) |
31410e84 | 6899 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6900 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6901 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6902 | { |
1eb8556f SM |
6903 | infrun_debug_printf |
6904 | ("stepping inside range [%s-%s]", | |
6905 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
6906 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6907 | |
c1e36e3e PA |
6908 | /* Tentatively re-enable range stepping; `resume' disables it if |
6909 | necessary (e.g., if we're stepping over a breakpoint or we | |
6910 | have software watchpoints). */ | |
6911 | ecs->event_thread->control.may_range_step = 1; | |
6912 | ||
b2175913 MS |
6913 | /* When stepping backward, stop at beginning of line range |
6914 | (unless it's the function entry point, in which case | |
6915 | keep going back to the call point). */ | |
1edb66d8 | 6916 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
16c381f0 | 6917 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6918 | && stop_pc != ecs->stop_func_start |
6919 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6920 | end_stepping_range (ecs); |
b2175913 MS |
6921 | else |
6922 | keep_going (ecs); | |
6923 | ||
488f131b JB |
6924 | return; |
6925 | } | |
c5aa993b | 6926 | |
488f131b | 6927 | /* We stepped out of the stepping range. */ |
c906108c | 6928 | |
488f131b | 6929 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6930 | loader dynamic symbol resolution code... |
6931 | ||
6932 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6933 | time loader code and reach the callee's address. | |
6934 | ||
6935 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6936 | the runtime loader code is handled just like any other | |
6937 | undebuggable function call. Now we need only keep stepping | |
6938 | backward through the trampoline code, and that's handled further | |
6939 | down, so there is nothing for us to do here. */ | |
6940 | ||
6941 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6942 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
1edb66d8 | 6943 | && in_solib_dynsym_resolve_code (ecs->event_thread->stop_pc ())) |
488f131b | 6944 | { |
4c8c40e6 | 6945 | CORE_ADDR pc_after_resolver = |
1edb66d8 | 6946 | gdbarch_skip_solib_resolver (gdbarch, ecs->event_thread->stop_pc ()); |
c906108c | 6947 | |
1eb8556f | 6948 | infrun_debug_printf ("stepped into dynsym resolve code"); |
527159b7 | 6949 | |
488f131b JB |
6950 | if (pc_after_resolver) |
6951 | { | |
6952 | /* Set up a step-resume breakpoint at the address | |
6953 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6954 | symtab_and_line sr_sal; |
488f131b | 6955 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6956 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6957 | |
a6d9a66e UW |
6958 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6959 | sr_sal, null_frame_id); | |
c5aa993b | 6960 | } |
c906108c | 6961 | |
488f131b JB |
6962 | keep_going (ecs); |
6963 | return; | |
6964 | } | |
c906108c | 6965 | |
1d509aa6 MM |
6966 | /* Step through an indirect branch thunk. */ |
6967 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b | 6968 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
1edb66d8 | 6969 | ecs->event_thread->stop_pc ())) |
1d509aa6 | 6970 | { |
1eb8556f | 6971 | infrun_debug_printf ("stepped into indirect branch thunk"); |
1d509aa6 MM |
6972 | keep_going (ecs); |
6973 | return; | |
6974 | } | |
6975 | ||
16c381f0 JK |
6976 | if (ecs->event_thread->control.step_range_end != 1 |
6977 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6978 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6979 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6980 | { |
1eb8556f | 6981 | infrun_debug_printf ("stepped into signal trampoline"); |
42edda50 | 6982 | /* The inferior, while doing a "step" or "next", has ended up in |
dda83cd7 SM |
6983 | a signal trampoline (either by a signal being delivered or by |
6984 | the signal handler returning). Just single-step until the | |
6985 | inferior leaves the trampoline (either by calling the handler | |
6986 | or returning). */ | |
488f131b JB |
6987 | keep_going (ecs); |
6988 | return; | |
6989 | } | |
c906108c | 6990 | |
14132e89 MR |
6991 | /* If we're in the return path from a shared library trampoline, |
6992 | we want to proceed through the trampoline when stepping. */ | |
6993 | /* macro/2012-04-25: This needs to come before the subroutine | |
6994 | call check below as on some targets return trampolines look | |
6995 | like subroutine calls (MIPS16 return thunks). */ | |
6996 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
1edb66d8 | 6997 | ecs->event_thread->stop_pc (), |
f2ffa92b | 6998 | ecs->stop_func_name) |
14132e89 MR |
6999 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
7000 | { | |
7001 | /* Determine where this trampoline returns. */ | |
1edb66d8 | 7002 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
f2ffa92b PA |
7003 | CORE_ADDR real_stop_pc |
7004 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 | 7005 | |
1eb8556f | 7006 | infrun_debug_printf ("stepped into solib return tramp"); |
14132e89 MR |
7007 | |
7008 | /* Only proceed through if we know where it's going. */ | |
7009 | if (real_stop_pc) | |
7010 | { | |
7011 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 7012 | symtab_and_line sr_sal; |
14132e89 MR |
7013 | sr_sal.pc = real_stop_pc; |
7014 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
7015 | sr_sal.pspace = get_frame_program_space (frame); | |
7016 | ||
7017 | /* Do not specify what the fp should be when we stop since | |
7018 | on some machines the prologue is where the new fp value | |
7019 | is established. */ | |
7020 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7021 | sr_sal, null_frame_id); | |
7022 | ||
7023 | /* Restart without fiddling with the step ranges or | |
7024 | other state. */ | |
7025 | keep_going (ecs); | |
7026 | return; | |
7027 | } | |
7028 | } | |
7029 | ||
c17eaafe DJ |
7030 | /* Check for subroutine calls. The check for the current frame |
7031 | equalling the step ID is not necessary - the check of the | |
7032 | previous frame's ID is sufficient - but it is a common case and | |
7033 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
7034 | |
7035 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
7036 | being equal, so to get into this block, both the current and | |
7037 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
7038 | /* The outer_frame_id check is a heuristic to detect stepping |
7039 | through startup code. If we step over an instruction which | |
7040 | sets the stack pointer from an invalid value to a valid value, | |
7041 | we may detect that as a subroutine call from the mythical | |
7042 | "outermost" function. This could be fixed by marking | |
7043 | outermost frames as !stack_p,code_p,special_p. Then the | |
7044 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 7045 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 7046 | for more. */ |
edb3359d | 7047 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 7048 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 7049 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
7050 | ecs->event_thread->control.step_stack_frame_id) |
7051 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 7052 | outer_frame_id) |
885eeb5b | 7053 | || (ecs->event_thread->control.step_start_function |
1edb66d8 | 7054 | != find_pc_function (ecs->event_thread->stop_pc ()))))) |
488f131b | 7055 | { |
1edb66d8 | 7056 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
95918acb | 7057 | CORE_ADDR real_stop_pc; |
8fb3e588 | 7058 | |
1eb8556f | 7059 | infrun_debug_printf ("stepped into subroutine"); |
527159b7 | 7060 | |
b7a084be | 7061 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
7062 | { |
7063 | /* I presume that step_over_calls is only 0 when we're | |
7064 | supposed to be stepping at the assembly language level | |
7065 | ("stepi"). Just stop. */ | |
388a8562 | 7066 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 7067 | end_stepping_range (ecs); |
95918acb AC |
7068 | return; |
7069 | } | |
8fb3e588 | 7070 | |
388a8562 MS |
7071 | /* Reverse stepping through solib trampolines. */ |
7072 | ||
7073 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 7074 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
7075 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
7076 | || (ecs->stop_func_start == 0 | |
7077 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
7078 | { | |
7079 | /* Any solib trampoline code can be handled in reverse | |
7080 | by simply continuing to single-step. We have already | |
7081 | executed the solib function (backwards), and a few | |
7082 | steps will take us back through the trampoline to the | |
7083 | caller. */ | |
7084 | keep_going (ecs); | |
7085 | return; | |
7086 | } | |
7087 | ||
16c381f0 | 7088 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 7089 | { |
b2175913 MS |
7090 | /* We're doing a "next". |
7091 | ||
7092 | Normal (forward) execution: set a breakpoint at the | |
7093 | callee's return address (the address at which the caller | |
7094 | will resume). | |
7095 | ||
7096 | Reverse (backward) execution. set the step-resume | |
7097 | breakpoint at the start of the function that we just | |
7098 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 7099 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
7100 | |
7101 | if (execution_direction == EXEC_REVERSE) | |
7102 | { | |
acf9414f JK |
7103 | /* If we're already at the start of the function, we've either |
7104 | just stepped backward into a single instruction function, | |
7105 | or stepped back out of a signal handler to the first instruction | |
7106 | of the function. Just keep going, which will single-step back | |
7107 | to the caller. */ | |
58c48e72 | 7108 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 7109 | { |
acf9414f | 7110 | /* Normal function call return (static or dynamic). */ |
51abb421 | 7111 | symtab_and_line sr_sal; |
acf9414f JK |
7112 | sr_sal.pc = ecs->stop_func_start; |
7113 | sr_sal.pspace = get_frame_program_space (frame); | |
7114 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7115 | sr_sal, null_frame_id); | |
7116 | } | |
b2175913 MS |
7117 | } |
7118 | else | |
568d6575 | 7119 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7120 | |
8567c30f AC |
7121 | keep_going (ecs); |
7122 | return; | |
7123 | } | |
a53c66de | 7124 | |
95918acb | 7125 | /* If we are in a function call trampoline (a stub between the |
dda83cd7 SM |
7126 | calling routine and the real function), locate the real |
7127 | function. That's what tells us (a) whether we want to step | |
7128 | into it at all, and (b) what prologue we want to run to the | |
7129 | end of, if we do step into it. */ | |
568d6575 | 7130 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 7131 | if (real_stop_pc == 0) |
568d6575 | 7132 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
7133 | if (real_stop_pc != 0) |
7134 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 7135 | |
db5f024e | 7136 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 7137 | { |
51abb421 | 7138 | symtab_and_line sr_sal; |
1b2bfbb9 | 7139 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 7140 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 7141 | |
a6d9a66e UW |
7142 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7143 | sr_sal, null_frame_id); | |
8fb3e588 AC |
7144 | keep_going (ecs); |
7145 | return; | |
1b2bfbb9 RC |
7146 | } |
7147 | ||
95918acb | 7148 | /* If we have line number information for the function we are |
1bfeeb0f JL |
7149 | thinking of stepping into and the function isn't on the skip |
7150 | list, step into it. | |
95918acb | 7151 | |
dda83cd7 SM |
7152 | If there are several symtabs at that PC (e.g. with include |
7153 | files), just want to know whether *any* of them have line | |
7154 | numbers. find_pc_line handles this. */ | |
95918acb AC |
7155 | { |
7156 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 7157 | |
95918acb | 7158 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 7159 | if (tmp_sal.line != 0 |
85817405 | 7160 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
7161 | tmp_sal) |
7162 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 7163 | { |
b2175913 | 7164 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 7165 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 7166 | else |
568d6575 | 7167 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
7168 | return; |
7169 | } | |
7170 | } | |
7171 | ||
7172 | /* If we have no line number and the step-stop-if-no-debug is | |
dda83cd7 SM |
7173 | set, we stop the step so that the user has a chance to switch |
7174 | in assembly mode. */ | |
16c381f0 | 7175 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 7176 | && step_stop_if_no_debug) |
95918acb | 7177 | { |
bdc36728 | 7178 | end_stepping_range (ecs); |
95918acb AC |
7179 | return; |
7180 | } | |
7181 | ||
b2175913 MS |
7182 | if (execution_direction == EXEC_REVERSE) |
7183 | { | |
acf9414f JK |
7184 | /* If we're already at the start of the function, we've either just |
7185 | stepped backward into a single instruction function without line | |
7186 | number info, or stepped back out of a signal handler to the first | |
7187 | instruction of the function without line number info. Just keep | |
7188 | going, which will single-step back to the caller. */ | |
7189 | if (ecs->stop_func_start != stop_pc) | |
7190 | { | |
7191 | /* Set a breakpoint at callee's start address. | |
7192 | From there we can step once and be back in the caller. */ | |
51abb421 | 7193 | symtab_and_line sr_sal; |
acf9414f JK |
7194 | sr_sal.pc = ecs->stop_func_start; |
7195 | sr_sal.pspace = get_frame_program_space (frame); | |
7196 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7197 | sr_sal, null_frame_id); | |
7198 | } | |
b2175913 MS |
7199 | } |
7200 | else | |
7201 | /* Set a breakpoint at callee's return address (the address | |
7202 | at which the caller will resume). */ | |
568d6575 | 7203 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7204 | |
95918acb | 7205 | keep_going (ecs); |
488f131b | 7206 | return; |
488f131b | 7207 | } |
c906108c | 7208 | |
fdd654f3 MS |
7209 | /* Reverse stepping through solib trampolines. */ |
7210 | ||
7211 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 7212 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 7213 | { |
1edb66d8 | 7214 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
f2ffa92b | 7215 | |
fdd654f3 MS |
7216 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
7217 | || (ecs->stop_func_start == 0 | |
7218 | && in_solib_dynsym_resolve_code (stop_pc))) | |
7219 | { | |
7220 | /* Any solib trampoline code can be handled in reverse | |
7221 | by simply continuing to single-step. We have already | |
7222 | executed the solib function (backwards), and a few | |
7223 | steps will take us back through the trampoline to the | |
7224 | caller. */ | |
7225 | keep_going (ecs); | |
7226 | return; | |
7227 | } | |
7228 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
7229 | { | |
7230 | /* Stepped backward into the solib dynsym resolver. | |
7231 | Set a breakpoint at its start and continue, then | |
7232 | one more step will take us out. */ | |
51abb421 | 7233 | symtab_and_line sr_sal; |
fdd654f3 | 7234 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 7235 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
7236 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7237 | sr_sal, null_frame_id); | |
7238 | keep_going (ecs); | |
7239 | return; | |
7240 | } | |
7241 | } | |
7242 | ||
8c95582d AB |
7243 | /* This always returns the sal for the inner-most frame when we are in a |
7244 | stack of inlined frames, even if GDB actually believes that it is in a | |
7245 | more outer frame. This is checked for below by calls to | |
7246 | inline_skipped_frames. */ | |
1edb66d8 | 7247 | stop_pc_sal = find_pc_line (ecs->event_thread->stop_pc (), 0); |
7ed0fe66 | 7248 | |
1b2bfbb9 RC |
7249 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
7250 | the trampoline processing logic, however, there are some trampolines | |
7251 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 7252 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 7253 | && ecs->stop_func_name == NULL |
2afb61aa | 7254 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 7255 | { |
1eb8556f | 7256 | infrun_debug_printf ("stepped into undebuggable function"); |
527159b7 | 7257 | |
1b2bfbb9 | 7258 | /* The inferior just stepped into, or returned to, an |
dda83cd7 SM |
7259 | undebuggable function (where there is no debugging information |
7260 | and no line number corresponding to the address where the | |
7261 | inferior stopped). Since we want to skip this kind of code, | |
7262 | we keep going until the inferior returns from this | |
7263 | function - unless the user has asked us not to (via | |
7264 | set step-mode) or we no longer know how to get back | |
7265 | to the call site. */ | |
14e60db5 | 7266 | if (step_stop_if_no_debug |
c7ce8faa | 7267 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
7268 | { |
7269 | /* If we have no line number and the step-stop-if-no-debug | |
7270 | is set, we stop the step so that the user has a chance to | |
7271 | switch in assembly mode. */ | |
bdc36728 | 7272 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7273 | return; |
7274 | } | |
7275 | else | |
7276 | { | |
7277 | /* Set a breakpoint at callee's return address (the address | |
7278 | at which the caller will resume). */ | |
568d6575 | 7279 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
7280 | keep_going (ecs); |
7281 | return; | |
7282 | } | |
7283 | } | |
7284 | ||
16c381f0 | 7285 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
7286 | { |
7287 | /* It is stepi or nexti. We always want to stop stepping after | |
dda83cd7 | 7288 | one instruction. */ |
1eb8556f | 7289 | infrun_debug_printf ("stepi/nexti"); |
bdc36728 | 7290 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7291 | return; |
7292 | } | |
7293 | ||
2afb61aa | 7294 | if (stop_pc_sal.line == 0) |
488f131b JB |
7295 | { |
7296 | /* We have no line number information. That means to stop | |
dda83cd7 SM |
7297 | stepping (does this always happen right after one instruction, |
7298 | when we do "s" in a function with no line numbers, | |
7299 | or can this happen as a result of a return or longjmp?). */ | |
1eb8556f | 7300 | infrun_debug_printf ("line number info"); |
bdc36728 | 7301 | end_stepping_range (ecs); |
488f131b JB |
7302 | return; |
7303 | } | |
c906108c | 7304 | |
edb3359d DJ |
7305 | /* Look for "calls" to inlined functions, part one. If the inline |
7306 | frame machinery detected some skipped call sites, we have entered | |
7307 | a new inline function. */ | |
7308 | ||
7309 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7310 | ecs->event_thread->control.step_frame_id) |
00431a78 | 7311 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 7312 | { |
1eb8556f | 7313 | infrun_debug_printf ("stepped into inlined function"); |
edb3359d | 7314 | |
51abb421 | 7315 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 7316 | |
16c381f0 | 7317 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
7318 | { |
7319 | /* For "step", we're going to stop. But if the call site | |
7320 | for this inlined function is on the same source line as | |
7321 | we were previously stepping, go down into the function | |
7322 | first. Otherwise stop at the call site. */ | |
7323 | ||
7324 | if (call_sal.line == ecs->event_thread->current_line | |
7325 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7326 | { |
7327 | step_into_inline_frame (ecs->event_thread); | |
7328 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7329 | { | |
7330 | keep_going (ecs); | |
7331 | return; | |
7332 | } | |
7333 | } | |
edb3359d | 7334 | |
bdc36728 | 7335 | end_stepping_range (ecs); |
edb3359d DJ |
7336 | return; |
7337 | } | |
7338 | else | |
7339 | { | |
7340 | /* For "next", we should stop at the call site if it is on a | |
7341 | different source line. Otherwise continue through the | |
7342 | inlined function. */ | |
7343 | if (call_sal.line == ecs->event_thread->current_line | |
7344 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7345 | keep_going (ecs); | |
7346 | else | |
bdc36728 | 7347 | end_stepping_range (ecs); |
edb3359d DJ |
7348 | return; |
7349 | } | |
7350 | } | |
7351 | ||
7352 | /* Look for "calls" to inlined functions, part two. If we are still | |
7353 | in the same real function we were stepping through, but we have | |
7354 | to go further up to find the exact frame ID, we are stepping | |
7355 | through a more inlined call beyond its call site. */ | |
7356 | ||
7357 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
7358 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7359 | ecs->event_thread->control.step_frame_id) |
edb3359d | 7360 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7361 | ecs->event_thread->control.step_frame_id)) |
edb3359d | 7362 | { |
1eb8556f | 7363 | infrun_debug_printf ("stepping through inlined function"); |
edb3359d | 7364 | |
4a4c04f1 BE |
7365 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7366 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7367 | keep_going (ecs); |
7368 | else | |
bdc36728 | 7369 | end_stepping_range (ecs); |
edb3359d DJ |
7370 | return; |
7371 | } | |
7372 | ||
8c95582d | 7373 | bool refresh_step_info = true; |
1edb66d8 | 7374 | if ((ecs->event_thread->stop_pc () == stop_pc_sal.pc) |
4e1c45ea | 7375 | && (ecs->event_thread->current_line != stop_pc_sal.line |
24b21115 | 7376 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) |
488f131b | 7377 | { |
ebde6f2d TV |
7378 | /* We are at a different line. */ |
7379 | ||
8c95582d AB |
7380 | if (stop_pc_sal.is_stmt) |
7381 | { | |
ebde6f2d TV |
7382 | /* We are at the start of a statement. |
7383 | ||
7384 | So stop. Note that we don't stop if we step into the middle of a | |
7385 | statement. That is said to make things like for (;;) statements | |
7386 | work better. */ | |
1eb8556f | 7387 | infrun_debug_printf ("stepped to a different line"); |
8c95582d AB |
7388 | end_stepping_range (ecs); |
7389 | return; | |
7390 | } | |
7391 | else if (frame_id_eq (get_frame_id (get_current_frame ()), | |
ebde6f2d | 7392 | ecs->event_thread->control.step_frame_id)) |
8c95582d | 7393 | { |
ebde6f2d TV |
7394 | /* We are not at the start of a statement, and we have not changed |
7395 | frame. | |
7396 | ||
7397 | We ignore this line table entry, and continue stepping forward, | |
8c95582d AB |
7398 | looking for a better place to stop. */ |
7399 | refresh_step_info = false; | |
1eb8556f SM |
7400 | infrun_debug_printf ("stepped to a different line, but " |
7401 | "it's not the start of a statement"); | |
8c95582d | 7402 | } |
ebde6f2d TV |
7403 | else |
7404 | { | |
7405 | /* We are not the start of a statement, and we have changed frame. | |
7406 | ||
7407 | We ignore this line table entry, and continue stepping forward, | |
7408 | looking for a better place to stop. Keep refresh_step_info at | |
7409 | true to note that the frame has changed, but ignore the line | |
7410 | number to make sure we don't ignore a subsequent entry with the | |
7411 | same line number. */ | |
7412 | stop_pc_sal.line = 0; | |
7413 | infrun_debug_printf ("stepped to a different frame, but " | |
7414 | "it's not the start of a statement"); | |
7415 | } | |
488f131b | 7416 | } |
c906108c | 7417 | |
488f131b | 7418 | /* We aren't done stepping. |
c906108c | 7419 | |
488f131b JB |
7420 | Optimize by setting the stepping range to the line. |
7421 | (We might not be in the original line, but if we entered a | |
7422 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7423 | things like for(;;) statements work better.) |
7424 | ||
7425 | If we entered a SAL that indicates a non-statement line table entry, | |
7426 | then we update the stepping range, but we don't update the step info, | |
7427 | which includes things like the line number we are stepping away from. | |
7428 | This means we will stop when we find a line table entry that is marked | |
7429 | as is-statement, even if it matches the non-statement one we just | |
7430 | stepped into. */ | |
c906108c | 7431 | |
16c381f0 JK |
7432 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7433 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7434 | ecs->event_thread->control.may_range_step = 1; |
c8353d68 AB |
7435 | infrun_debug_printf |
7436 | ("updated step range, start = %s, end = %s, may_range_step = %d", | |
7437 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
7438 | paddress (gdbarch, ecs->event_thread->control.step_range_end), | |
7439 | ecs->event_thread->control.may_range_step); | |
8c95582d AB |
7440 | if (refresh_step_info) |
7441 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7442 | |
1eb8556f | 7443 | infrun_debug_printf ("keep going"); |
488f131b | 7444 | keep_going (ecs); |
104c1213 JM |
7445 | } |
7446 | ||
408f6686 PA |
7447 | static bool restart_stepped_thread (process_stratum_target *resume_target, |
7448 | ptid_t resume_ptid); | |
7449 | ||
c447ac0b PA |
7450 | /* In all-stop mode, if we're currently stepping but have stopped in |
7451 | some other thread, we may need to switch back to the stepped | |
7452 | thread. Returns true we set the inferior running, false if we left | |
7453 | it stopped (and the event needs further processing). */ | |
7454 | ||
c4464ade | 7455 | static bool |
c447ac0b PA |
7456 | switch_back_to_stepped_thread (struct execution_control_state *ecs) |
7457 | { | |
fbea99ea | 7458 | if (!target_is_non_stop_p ()) |
c447ac0b | 7459 | { |
99619bea PA |
7460 | /* If any thread is blocked on some internal breakpoint, and we |
7461 | simply need to step over that breakpoint to get it going | |
7462 | again, do that first. */ | |
7463 | ||
7464 | /* However, if we see an event for the stepping thread, then we | |
7465 | know all other threads have been moved past their breakpoints | |
7466 | already. Let the caller check whether the step is finished, | |
7467 | etc., before deciding to move it past a breakpoint. */ | |
7468 | if (ecs->event_thread->control.step_range_end != 0) | |
c4464ade | 7469 | return false; |
99619bea PA |
7470 | |
7471 | /* Check if the current thread is blocked on an incomplete | |
7472 | step-over, interrupted by a random signal. */ | |
7473 | if (ecs->event_thread->control.trap_expected | |
1edb66d8 | 7474 | && ecs->event_thread->stop_signal () != GDB_SIGNAL_TRAP) |
c447ac0b | 7475 | { |
1eb8556f SM |
7476 | infrun_debug_printf |
7477 | ("need to finish step-over of [%s]", | |
0fab7955 | 7478 | ecs->event_thread->ptid.to_string ().c_str ()); |
99619bea | 7479 | keep_going (ecs); |
c4464ade | 7480 | return true; |
99619bea | 7481 | } |
2adfaa28 | 7482 | |
99619bea PA |
7483 | /* Check if the current thread is blocked by a single-step |
7484 | breakpoint of another thread. */ | |
7485 | if (ecs->hit_singlestep_breakpoint) | |
7486 | { | |
1eb8556f | 7487 | infrun_debug_printf ("need to step [%s] over single-step breakpoint", |
0fab7955 | 7488 | ecs->ptid.to_string ().c_str ()); |
99619bea | 7489 | keep_going (ecs); |
c4464ade | 7490 | return true; |
99619bea PA |
7491 | } |
7492 | ||
4d9d9d04 PA |
7493 | /* If this thread needs yet another step-over (e.g., stepping |
7494 | through a delay slot), do it first before moving on to | |
7495 | another thread. */ | |
7496 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7497 | { | |
1eb8556f SM |
7498 | infrun_debug_printf |
7499 | ("thread [%s] still needs step-over", | |
0fab7955 | 7500 | ecs->event_thread->ptid.to_string ().c_str ()); |
4d9d9d04 | 7501 | keep_going (ecs); |
c4464ade | 7502 | return true; |
4d9d9d04 | 7503 | } |
70509625 | 7504 | |
483805cf PA |
7505 | /* If scheduler locking applies even if not stepping, there's no |
7506 | need to walk over threads. Above we've checked whether the | |
7507 | current thread is stepping. If some other thread not the | |
7508 | event thread is stepping, then it must be that scheduler | |
7509 | locking is not in effect. */ | |
856e7dd6 | 7510 | if (schedlock_applies (ecs->event_thread)) |
c4464ade | 7511 | return false; |
483805cf | 7512 | |
4d9d9d04 PA |
7513 | /* Otherwise, we no longer expect a trap in the current thread. |
7514 | Clear the trap_expected flag before switching back -- this is | |
7515 | what keep_going does as well, if we call it. */ | |
7516 | ecs->event_thread->control.trap_expected = 0; | |
7517 | ||
7518 | /* Likewise, clear the signal if it should not be passed. */ | |
1edb66d8 SM |
7519 | if (!signal_program[ecs->event_thread->stop_signal ()]) |
7520 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
4d9d9d04 | 7521 | |
408f6686 | 7522 | if (restart_stepped_thread (ecs->target, ecs->ptid)) |
4d9d9d04 PA |
7523 | { |
7524 | prepare_to_wait (ecs); | |
c4464ade | 7525 | return true; |
4d9d9d04 PA |
7526 | } |
7527 | ||
408f6686 PA |
7528 | switch_to_thread (ecs->event_thread); |
7529 | } | |
4d9d9d04 | 7530 | |
408f6686 PA |
7531 | return false; |
7532 | } | |
f3f8ece4 | 7533 | |
408f6686 PA |
7534 | /* Look for the thread that was stepping, and resume it. |
7535 | RESUME_TARGET / RESUME_PTID indicate the set of threads the caller | |
7536 | is resuming. Return true if a thread was started, false | |
7537 | otherwise. */ | |
483805cf | 7538 | |
408f6686 PA |
7539 | static bool |
7540 | restart_stepped_thread (process_stratum_target *resume_target, | |
7541 | ptid_t resume_ptid) | |
7542 | { | |
7543 | /* Do all pending step-overs before actually proceeding with | |
7544 | step/next/etc. */ | |
7545 | if (start_step_over ()) | |
7546 | return true; | |
483805cf | 7547 | |
408f6686 PA |
7548 | for (thread_info *tp : all_threads_safe ()) |
7549 | { | |
7550 | if (tp->state == THREAD_EXITED) | |
7551 | continue; | |
7552 | ||
1edb66d8 | 7553 | if (tp->has_pending_waitstatus ()) |
408f6686 | 7554 | continue; |
483805cf | 7555 | |
408f6686 PA |
7556 | /* Ignore threads of processes the caller is not |
7557 | resuming. */ | |
7558 | if (!sched_multi | |
7559 | && (tp->inf->process_target () != resume_target | |
7560 | || tp->inf->pid != resume_ptid.pid ())) | |
7561 | continue; | |
483805cf | 7562 | |
408f6686 PA |
7563 | if (tp->control.trap_expected) |
7564 | { | |
7565 | infrun_debug_printf ("switching back to stepped thread (step-over)"); | |
483805cf | 7566 | |
408f6686 PA |
7567 | if (keep_going_stepped_thread (tp)) |
7568 | return true; | |
99619bea | 7569 | } |
408f6686 PA |
7570 | } |
7571 | ||
7572 | for (thread_info *tp : all_threads_safe ()) | |
7573 | { | |
7574 | if (tp->state == THREAD_EXITED) | |
7575 | continue; | |
7576 | ||
1edb66d8 | 7577 | if (tp->has_pending_waitstatus ()) |
408f6686 | 7578 | continue; |
99619bea | 7579 | |
408f6686 PA |
7580 | /* Ignore threads of processes the caller is not |
7581 | resuming. */ | |
7582 | if (!sched_multi | |
7583 | && (tp->inf->process_target () != resume_target | |
7584 | || tp->inf->pid != resume_ptid.pid ())) | |
7585 | continue; | |
7586 | ||
7587 | /* Did we find the stepping thread? */ | |
7588 | if (tp->control.step_range_end) | |
99619bea | 7589 | { |
408f6686 | 7590 | infrun_debug_printf ("switching back to stepped thread (stepping)"); |
c447ac0b | 7591 | |
408f6686 PA |
7592 | if (keep_going_stepped_thread (tp)) |
7593 | return true; | |
2ac7589c PA |
7594 | } |
7595 | } | |
2adfaa28 | 7596 | |
c4464ade | 7597 | return false; |
2ac7589c | 7598 | } |
2adfaa28 | 7599 | |
408f6686 PA |
7600 | /* See infrun.h. */ |
7601 | ||
7602 | void | |
7603 | restart_after_all_stop_detach (process_stratum_target *proc_target) | |
7604 | { | |
7605 | /* Note we don't check target_is_non_stop_p() here, because the | |
7606 | current inferior may no longer have a process_stratum target | |
7607 | pushed, as we just detached. */ | |
7608 | ||
7609 | /* See if we have a THREAD_RUNNING thread that need to be | |
7610 | re-resumed. If we have any thread that is already executing, | |
7611 | then we don't need to resume the target -- it is already been | |
7612 | resumed. With the remote target (in all-stop), it's even | |
7613 | impossible to issue another resumption if the target is already | |
7614 | resumed, until the target reports a stop. */ | |
7615 | for (thread_info *thr : all_threads (proc_target)) | |
7616 | { | |
7617 | if (thr->state != THREAD_RUNNING) | |
7618 | continue; | |
7619 | ||
7620 | /* If we have any thread that is already executing, then we | |
7621 | don't need to resume the target -- it is already been | |
7622 | resumed. */ | |
611841bb | 7623 | if (thr->executing ()) |
408f6686 PA |
7624 | return; |
7625 | ||
7626 | /* If we have a pending event to process, skip resuming the | |
7627 | target and go straight to processing it. */ | |
1edb66d8 | 7628 | if (thr->resumed () && thr->has_pending_waitstatus ()) |
408f6686 PA |
7629 | return; |
7630 | } | |
7631 | ||
7632 | /* Alright, we need to re-resume the target. If a thread was | |
7633 | stepping, we need to restart it stepping. */ | |
7634 | if (restart_stepped_thread (proc_target, minus_one_ptid)) | |
7635 | return; | |
7636 | ||
7637 | /* Otherwise, find the first THREAD_RUNNING thread and resume | |
7638 | it. */ | |
7639 | for (thread_info *thr : all_threads (proc_target)) | |
7640 | { | |
7641 | if (thr->state != THREAD_RUNNING) | |
7642 | continue; | |
7643 | ||
7644 | execution_control_state ecs; | |
7645 | reset_ecs (&ecs, thr); | |
7646 | switch_to_thread (thr); | |
7647 | keep_going (&ecs); | |
7648 | return; | |
7649 | } | |
7650 | } | |
7651 | ||
2ac7589c PA |
7652 | /* Set a previously stepped thread back to stepping. Returns true on |
7653 | success, false if the resume is not possible (e.g., the thread | |
7654 | vanished). */ | |
7655 | ||
c4464ade | 7656 | static bool |
2ac7589c PA |
7657 | keep_going_stepped_thread (struct thread_info *tp) |
7658 | { | |
7659 | struct frame_info *frame; | |
2ac7589c PA |
7660 | struct execution_control_state ecss; |
7661 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7662 | |
2ac7589c PA |
7663 | /* If the stepping thread exited, then don't try to switch back and |
7664 | resume it, which could fail in several different ways depending | |
7665 | on the target. Instead, just keep going. | |
2adfaa28 | 7666 | |
2ac7589c PA |
7667 | We can find a stepping dead thread in the thread list in two |
7668 | cases: | |
2adfaa28 | 7669 | |
2ac7589c PA |
7670 | - The target supports thread exit events, and when the target |
7671 | tries to delete the thread from the thread list, inferior_ptid | |
7672 | pointed at the exiting thread. In such case, calling | |
7673 | delete_thread does not really remove the thread from the list; | |
7674 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7675 | |
2ac7589c PA |
7676 | - The target's debug interface does not support thread exit |
7677 | events, and so we have no idea whatsoever if the previously | |
7678 | stepping thread is still alive. For that reason, we need to | |
7679 | synchronously query the target now. */ | |
2adfaa28 | 7680 | |
00431a78 | 7681 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c | 7682 | { |
1eb8556f SM |
7683 | infrun_debug_printf ("not resuming previously stepped thread, it has " |
7684 | "vanished"); | |
2ac7589c | 7685 | |
00431a78 | 7686 | delete_thread (tp); |
c4464ade | 7687 | return false; |
c447ac0b | 7688 | } |
2ac7589c | 7689 | |
1eb8556f | 7690 | infrun_debug_printf ("resuming previously stepped thread"); |
2ac7589c PA |
7691 | |
7692 | reset_ecs (ecs, tp); | |
00431a78 | 7693 | switch_to_thread (tp); |
2ac7589c | 7694 | |
1edb66d8 | 7695 | tp->set_stop_pc (regcache_read_pc (get_thread_regcache (tp))); |
2ac7589c | 7696 | frame = get_current_frame (); |
2ac7589c PA |
7697 | |
7698 | /* If the PC of the thread we were trying to single-step has | |
7699 | changed, then that thread has trapped or been signaled, but the | |
7700 | event has not been reported to GDB yet. Re-poll the target | |
7701 | looking for this particular thread's event (i.e. temporarily | |
7702 | enable schedlock) by: | |
7703 | ||
7704 | - setting a break at the current PC | |
7705 | - resuming that particular thread, only (by setting trap | |
7706 | expected) | |
7707 | ||
7708 | This prevents us continuously moving the single-step breakpoint | |
7709 | forward, one instruction at a time, overstepping. */ | |
7710 | ||
1edb66d8 | 7711 | if (tp->stop_pc () != tp->prev_pc) |
2ac7589c PA |
7712 | { |
7713 | ptid_t resume_ptid; | |
7714 | ||
1eb8556f SM |
7715 | infrun_debug_printf ("expected thread advanced also (%s -> %s)", |
7716 | paddress (target_gdbarch (), tp->prev_pc), | |
1edb66d8 | 7717 | paddress (target_gdbarch (), tp->stop_pc ())); |
2ac7589c PA |
7718 | |
7719 | /* Clear the info of the previous step-over, as it's no longer | |
7720 | valid (if the thread was trying to step over a breakpoint, it | |
7721 | has already succeeded). It's what keep_going would do too, | |
7722 | if we called it. Do this before trying to insert the sss | |
7723 | breakpoint, otherwise if we were previously trying to step | |
7724 | over this exact address in another thread, the breakpoint is | |
7725 | skipped. */ | |
7726 | clear_step_over_info (); | |
7727 | tp->control.trap_expected = 0; | |
7728 | ||
7729 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7730 | get_frame_address_space (frame), | |
1edb66d8 | 7731 | tp->stop_pc ()); |
2ac7589c | 7732 | |
7846f3aa | 7733 | tp->set_resumed (true); |
fbea99ea | 7734 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
c4464ade | 7735 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
2ac7589c PA |
7736 | } |
7737 | else | |
7738 | { | |
1eb8556f | 7739 | infrun_debug_printf ("expected thread still hasn't advanced"); |
2ac7589c PA |
7740 | |
7741 | keep_going_pass_signal (ecs); | |
7742 | } | |
c4464ade SM |
7743 | |
7744 | return true; | |
c447ac0b PA |
7745 | } |
7746 | ||
8b061563 PA |
7747 | /* Is thread TP in the middle of (software or hardware) |
7748 | single-stepping? (Note the result of this function must never be | |
7749 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7750 | |
c4464ade | 7751 | static bool |
b3444185 | 7752 | currently_stepping (struct thread_info *tp) |
a7212384 | 7753 | { |
8358c15c JK |
7754 | return ((tp->control.step_range_end |
7755 | && tp->control.step_resume_breakpoint == NULL) | |
7756 | || tp->control.trap_expected | |
af48d08f | 7757 | || tp->stepped_breakpoint |
8358c15c | 7758 | || bpstat_should_step ()); |
a7212384 UW |
7759 | } |
7760 | ||
b2175913 MS |
7761 | /* Inferior has stepped into a subroutine call with source code that |
7762 | we should not step over. Do step to the first line of code in | |
7763 | it. */ | |
c2c6d25f JM |
7764 | |
7765 | static void | |
568d6575 UW |
7766 | handle_step_into_function (struct gdbarch *gdbarch, |
7767 | struct execution_control_state *ecs) | |
c2c6d25f | 7768 | { |
7e324e48 GB |
7769 | fill_in_stop_func (gdbarch, ecs); |
7770 | ||
f2ffa92b | 7771 | compunit_symtab *cust |
1edb66d8 | 7772 | = find_pc_compunit_symtab (ecs->event_thread->stop_pc ()); |
43f3e411 | 7773 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7774 | ecs->stop_func_start |
7775 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7776 | |
51abb421 | 7777 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7778 | /* Use the step_resume_break to step until the end of the prologue, |
7779 | even if that involves jumps (as it seems to on the vax under | |
7780 | 4.2). */ | |
7781 | /* If the prologue ends in the middle of a source line, continue to | |
7782 | the end of that source line (if it is still within the function). | |
7783 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7784 | if (stop_func_sal.end |
7785 | && stop_func_sal.pc != ecs->stop_func_start | |
7786 | && stop_func_sal.end < ecs->stop_func_end) | |
7787 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7788 | |
2dbd5e30 KB |
7789 | /* Architectures which require breakpoint adjustment might not be able |
7790 | to place a breakpoint at the computed address. If so, the test | |
7791 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7792 | ecs->stop_func_start to an address at which a breakpoint may be | |
7793 | legitimately placed. | |
8fb3e588 | 7794 | |
2dbd5e30 KB |
7795 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7796 | made, GDB will enter an infinite loop when stepping through | |
7797 | optimized code consisting of VLIW instructions which contain | |
7798 | subinstructions corresponding to different source lines. On | |
7799 | FR-V, it's not permitted to place a breakpoint on any but the | |
7800 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7801 | set, GDB will adjust the breakpoint address to the beginning of | |
7802 | the VLIW instruction. Thus, we need to make the corresponding | |
7803 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7804 | |
568d6575 | 7805 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7806 | { |
7807 | ecs->stop_func_start | |
568d6575 | 7808 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7809 | ecs->stop_func_start); |
2dbd5e30 KB |
7810 | } |
7811 | ||
1edb66d8 | 7812 | if (ecs->stop_func_start == ecs->event_thread->stop_pc ()) |
c2c6d25f JM |
7813 | { |
7814 | /* We are already there: stop now. */ | |
bdc36728 | 7815 | end_stepping_range (ecs); |
c2c6d25f JM |
7816 | return; |
7817 | } | |
7818 | else | |
7819 | { | |
7820 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7821 | symtab_and_line sr_sal; |
c2c6d25f JM |
7822 | sr_sal.pc = ecs->stop_func_start; |
7823 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7824 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7825 | |
c2c6d25f | 7826 | /* Do not specify what the fp should be when we stop since on |
dda83cd7 SM |
7827 | some machines the prologue is where the new fp value is |
7828 | established. */ | |
a6d9a66e | 7829 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7830 | |
7831 | /* And make sure stepping stops right away then. */ | |
16c381f0 | 7832 | ecs->event_thread->control.step_range_end |
dda83cd7 | 7833 | = ecs->event_thread->control.step_range_start; |
c2c6d25f JM |
7834 | } |
7835 | keep_going (ecs); | |
7836 | } | |
d4f3574e | 7837 | |
b2175913 MS |
7838 | /* Inferior has stepped backward into a subroutine call with source |
7839 | code that we should not step over. Do step to the beginning of the | |
7840 | last line of code in it. */ | |
7841 | ||
7842 | static void | |
568d6575 UW |
7843 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7844 | struct execution_control_state *ecs) | |
b2175913 | 7845 | { |
43f3e411 | 7846 | struct compunit_symtab *cust; |
167e4384 | 7847 | struct symtab_and_line stop_func_sal; |
b2175913 | 7848 | |
7e324e48 GB |
7849 | fill_in_stop_func (gdbarch, ecs); |
7850 | ||
1edb66d8 | 7851 | cust = find_pc_compunit_symtab (ecs->event_thread->stop_pc ()); |
43f3e411 | 7852 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7853 | ecs->stop_func_start |
7854 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7855 | |
1edb66d8 | 7856 | stop_func_sal = find_pc_line (ecs->event_thread->stop_pc (), 0); |
b2175913 MS |
7857 | |
7858 | /* OK, we're just going to keep stepping here. */ | |
1edb66d8 | 7859 | if (stop_func_sal.pc == ecs->event_thread->stop_pc ()) |
b2175913 MS |
7860 | { |
7861 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7862 | end_stepping_range (ecs); |
b2175913 MS |
7863 | } |
7864 | else | |
7865 | { | |
7866 | /* Else just reset the step range and keep going. | |
7867 | No step-resume breakpoint, they don't work for | |
7868 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7869 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7870 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7871 | keep_going (ecs); |
7872 | } | |
7873 | return; | |
7874 | } | |
7875 | ||
d3169d93 | 7876 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7877 | This is used to both functions and to skip over code. */ |
7878 | ||
7879 | static void | |
2c03e5be PA |
7880 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7881 | struct symtab_and_line sr_sal, | |
7882 | struct frame_id sr_id, | |
7883 | enum bptype sr_type) | |
44cbf7b5 | 7884 | { |
611c83ae PA |
7885 | /* There should never be more than one step-resume or longjmp-resume |
7886 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7887 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7888 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7889 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 | 7890 | |
1eb8556f SM |
7891 | infrun_debug_printf ("inserting step-resume breakpoint at %s", |
7892 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7893 | |
8358c15c | 7894 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7895 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7896 | } |
7897 | ||
9da8c2a0 | 7898 | void |
2c03e5be PA |
7899 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7900 | struct symtab_and_line sr_sal, | |
7901 | struct frame_id sr_id) | |
7902 | { | |
7903 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7904 | sr_sal, sr_id, | |
7905 | bp_step_resume); | |
44cbf7b5 | 7906 | } |
7ce450bd | 7907 | |
2c03e5be PA |
7908 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7909 | This is used to skip a potential signal handler. | |
7ce450bd | 7910 | |
14e60db5 DJ |
7911 | This is called with the interrupted function's frame. The signal |
7912 | handler, when it returns, will resume the interrupted function at | |
7913 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7914 | |
7915 | static void | |
2c03e5be | 7916 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7917 | { |
f4c1edd8 | 7918 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7919 | |
51abb421 PA |
7920 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7921 | ||
7922 | symtab_and_line sr_sal; | |
568d6575 | 7923 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7924 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7925 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7926 | |
2c03e5be PA |
7927 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7928 | get_stack_frame_id (return_frame), | |
7929 | bp_hp_step_resume); | |
d303a6c7 AC |
7930 | } |
7931 | ||
2c03e5be PA |
7932 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7933 | is used to skip a function after stepping into it (for "next" or if | |
7934 | the called function has no debugging information). | |
14e60db5 DJ |
7935 | |
7936 | The current function has almost always been reached by single | |
7937 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7938 | current function, and the breakpoint will be set at the caller's | |
7939 | resume address. | |
7940 | ||
7941 | This is a separate function rather than reusing | |
2c03e5be | 7942 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7943 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7944 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7945 | |
7946 | static void | |
7947 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7948 | { | |
14e60db5 DJ |
7949 | /* We shouldn't have gotten here if we don't know where the call site |
7950 | is. */ | |
c7ce8faa | 7951 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7952 | |
51abb421 | 7953 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7954 | |
51abb421 | 7955 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7956 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7957 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7958 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7959 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7960 | |
a6d9a66e | 7961 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7962 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7963 | } |
7964 | ||
611c83ae PA |
7965 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7966 | new breakpoint at the target of a jmp_buf. The handling of | |
7967 | longjmp-resume uses the same mechanisms used for handling | |
7968 | "step-resume" breakpoints. */ | |
7969 | ||
7970 | static void | |
a6d9a66e | 7971 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7972 | { |
e81a37f7 TT |
7973 | /* There should never be more than one longjmp-resume breakpoint per |
7974 | thread, so we should never be setting a new | |
611c83ae | 7975 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7976 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae | 7977 | |
1eb8556f SM |
7978 | infrun_debug_printf ("inserting longjmp-resume breakpoint at %s", |
7979 | paddress (gdbarch, pc)); | |
611c83ae | 7980 | |
e81a37f7 | 7981 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7982 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7983 | } |
7984 | ||
186c406b TT |
7985 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7986 | the exception. The block B is the block of the unwinder debug hook | |
7987 | function. FRAME is the frame corresponding to the call to this | |
7988 | function. SYM is the symbol of the function argument holding the | |
7989 | target PC of the exception. */ | |
7990 | ||
7991 | static void | |
7992 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7993 | const struct block *b, |
186c406b TT |
7994 | struct frame_info *frame, |
7995 | struct symbol *sym) | |
7996 | { | |
a70b8144 | 7997 | try |
186c406b | 7998 | { |
63e43d3a | 7999 | struct block_symbol vsym; |
186c406b TT |
8000 | struct value *value; |
8001 | CORE_ADDR handler; | |
8002 | struct breakpoint *bp; | |
8003 | ||
987012b8 | 8004 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 8005 | b, VAR_DOMAIN); |
63e43d3a | 8006 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
8007 | /* If the value was optimized out, revert to the old behavior. */ |
8008 | if (! value_optimized_out (value)) | |
8009 | { | |
8010 | handler = value_as_address (value); | |
8011 | ||
1eb8556f SM |
8012 | infrun_debug_printf ("exception resume at %lx", |
8013 | (unsigned long) handler); | |
186c406b TT |
8014 | |
8015 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
8016 | handler, |
8017 | bp_exception_resume).release (); | |
c70a6932 JK |
8018 | |
8019 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
8020 | frame = NULL; | |
8021 | ||
5d5658a1 | 8022 | bp->thread = tp->global_num; |
186c406b TT |
8023 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
8024 | } | |
8025 | } | |
230d2906 | 8026 | catch (const gdb_exception_error &e) |
492d29ea PA |
8027 | { |
8028 | /* We want to ignore errors here. */ | |
8029 | } | |
186c406b TT |
8030 | } |
8031 | ||
28106bc2 SDJ |
8032 | /* A helper for check_exception_resume that sets an |
8033 | exception-breakpoint based on a SystemTap probe. */ | |
8034 | ||
8035 | static void | |
8036 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 8037 | const struct bound_probe *probe, |
28106bc2 SDJ |
8038 | struct frame_info *frame) |
8039 | { | |
8040 | struct value *arg_value; | |
8041 | CORE_ADDR handler; | |
8042 | struct breakpoint *bp; | |
8043 | ||
8044 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
8045 | if (!arg_value) | |
8046 | return; | |
8047 | ||
8048 | handler = value_as_address (arg_value); | |
8049 | ||
1eb8556f SM |
8050 | infrun_debug_printf ("exception resume at %s", |
8051 | paddress (probe->objfile->arch (), handler)); | |
28106bc2 SDJ |
8052 | |
8053 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 8054 | handler, bp_exception_resume).release (); |
5d5658a1 | 8055 | bp->thread = tp->global_num; |
28106bc2 SDJ |
8056 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
8057 | } | |
8058 | ||
186c406b TT |
8059 | /* This is called when an exception has been intercepted. Check to |
8060 | see whether the exception's destination is of interest, and if so, | |
8061 | set an exception resume breakpoint there. */ | |
8062 | ||
8063 | static void | |
8064 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 8065 | struct frame_info *frame) |
186c406b | 8066 | { |
729662a5 | 8067 | struct bound_probe probe; |
28106bc2 SDJ |
8068 | struct symbol *func; |
8069 | ||
8070 | /* First see if this exception unwinding breakpoint was set via a | |
8071 | SystemTap probe point. If so, the probe has two arguments: the | |
8072 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
8073 | set a breakpoint there. */ | |
6bac7473 | 8074 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 8075 | if (probe.prob) |
28106bc2 | 8076 | { |
729662a5 | 8077 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
8078 | return; |
8079 | } | |
8080 | ||
8081 | func = get_frame_function (frame); | |
8082 | if (!func) | |
8083 | return; | |
186c406b | 8084 | |
a70b8144 | 8085 | try |
186c406b | 8086 | { |
3977b71f | 8087 | const struct block *b; |
8157b174 | 8088 | struct block_iterator iter; |
186c406b TT |
8089 | struct symbol *sym; |
8090 | int argno = 0; | |
8091 | ||
8092 | /* The exception breakpoint is a thread-specific breakpoint on | |
8093 | the unwinder's debug hook, declared as: | |
8094 | ||
8095 | void _Unwind_DebugHook (void *cfa, void *handler); | |
8096 | ||
8097 | The CFA argument indicates the frame to which control is | |
8098 | about to be transferred. HANDLER is the destination PC. | |
8099 | ||
8100 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
8101 | This is not extremely efficient but it avoids issues in gdb | |
8102 | with computing the DWARF CFA, and it also works even in weird | |
8103 | cases such as throwing an exception from inside a signal | |
8104 | handler. */ | |
8105 | ||
4aeddc50 | 8106 | b = func->value_block (); |
186c406b TT |
8107 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
8108 | { | |
d9743061 | 8109 | if (!sym->is_argument ()) |
186c406b TT |
8110 | continue; |
8111 | ||
8112 | if (argno == 0) | |
8113 | ++argno; | |
8114 | else | |
8115 | { | |
8116 | insert_exception_resume_breakpoint (ecs->event_thread, | |
8117 | b, frame, sym); | |
8118 | break; | |
8119 | } | |
8120 | } | |
8121 | } | |
230d2906 | 8122 | catch (const gdb_exception_error &e) |
492d29ea PA |
8123 | { |
8124 | } | |
186c406b TT |
8125 | } |
8126 | ||
104c1213 | 8127 | static void |
22bcd14b | 8128 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 8129 | { |
1eb8556f | 8130 | infrun_debug_printf ("stop_waiting"); |
527159b7 | 8131 | |
cd0fc7c3 SS |
8132 | /* Let callers know we don't want to wait for the inferior anymore. */ |
8133 | ecs->wait_some_more = 0; | |
fbea99ea | 8134 | |
53cccef1 | 8135 | /* If all-stop, but there exists a non-stop target, stop all |
fbea99ea | 8136 | threads now that we're presenting the stop to the user. */ |
53cccef1 | 8137 | if (!non_stop && exists_non_stop_target ()) |
4f5539f0 | 8138 | stop_all_threads ("presenting stop to user in all-stop"); |
cd0fc7c3 SS |
8139 | } |
8140 | ||
4d9d9d04 PA |
8141 | /* Like keep_going, but passes the signal to the inferior, even if the |
8142 | signal is set to nopass. */ | |
d4f3574e SS |
8143 | |
8144 | static void | |
4d9d9d04 | 8145 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 8146 | { |
d7e15655 | 8147 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
7846f3aa | 8148 | gdb_assert (!ecs->event_thread->resumed ()); |
4d9d9d04 | 8149 | |
d4f3574e | 8150 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 8151 | ecs->event_thread->prev_pc |
fc75c28b | 8152 | = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 8153 | |
4d9d9d04 | 8154 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 8155 | { |
4d9d9d04 PA |
8156 | struct thread_info *tp = ecs->event_thread; |
8157 | ||
1eb8556f SM |
8158 | infrun_debug_printf ("%s has trap_expected set, " |
8159 | "resuming to collect trap", | |
0fab7955 | 8160 | tp->ptid.to_string ().c_str ()); |
4d9d9d04 | 8161 | |
a9ba6bae PA |
8162 | /* We haven't yet gotten our trap, and either: intercepted a |
8163 | non-signal event (e.g., a fork); or took a signal which we | |
8164 | are supposed to pass through to the inferior. Simply | |
8165 | continue. */ | |
1edb66d8 | 8166 | resume (ecs->event_thread->stop_signal ()); |
d4f3574e | 8167 | } |
372316f1 PA |
8168 | else if (step_over_info_valid_p ()) |
8169 | { | |
8170 | /* Another thread is stepping over a breakpoint in-line. If | |
8171 | this thread needs a step-over too, queue the request. In | |
8172 | either case, this resume must be deferred for later. */ | |
8173 | struct thread_info *tp = ecs->event_thread; | |
8174 | ||
8175 | if (ecs->hit_singlestep_breakpoint | |
8176 | || thread_still_needs_step_over (tp)) | |
8177 | { | |
1eb8556f SM |
8178 | infrun_debug_printf ("step-over already in progress: " |
8179 | "step-over for %s deferred", | |
0fab7955 | 8180 | tp->ptid.to_string ().c_str ()); |
28d5518b | 8181 | global_thread_step_over_chain_enqueue (tp); |
372316f1 PA |
8182 | } |
8183 | else | |
0fab7955 SM |
8184 | infrun_debug_printf ("step-over in progress: resume of %s deferred", |
8185 | tp->ptid.to_string ().c_str ()); | |
372316f1 | 8186 | } |
d4f3574e SS |
8187 | else |
8188 | { | |
31e77af2 | 8189 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
8190 | int remove_bp; |
8191 | int remove_wps; | |
8d297bbf | 8192 | step_over_what step_what; |
31e77af2 | 8193 | |
d4f3574e | 8194 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
8195 | anyway (if we got a signal, the user asked it be passed to |
8196 | the child) | |
8197 | -- or -- | |
8198 | We got our expected trap, but decided we should resume from | |
8199 | it. | |
d4f3574e | 8200 | |
a9ba6bae | 8201 | We're going to run this baby now! |
d4f3574e | 8202 | |
c36b740a VP |
8203 | Note that insert_breakpoints won't try to re-insert |
8204 | already inserted breakpoints. Therefore, we don't | |
8205 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 8206 | |
31e77af2 PA |
8207 | /* If we need to step over a breakpoint, and we're not using |
8208 | displaced stepping to do so, insert all breakpoints | |
8209 | (watchpoints, etc.) but the one we're stepping over, step one | |
8210 | instruction, and then re-insert the breakpoint when that step | |
8211 | is finished. */ | |
963f9c80 | 8212 | |
6c4cfb24 PA |
8213 | step_what = thread_still_needs_step_over (ecs->event_thread); |
8214 | ||
963f9c80 | 8215 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
8216 | || (step_what & STEP_OVER_BREAKPOINT)); |
8217 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 8218 | |
cb71640d PA |
8219 | /* We can't use displaced stepping if we need to step past a |
8220 | watchpoint. The instruction copied to the scratch pad would | |
8221 | still trigger the watchpoint. */ | |
8222 | if (remove_bp | |
3fc8eb30 | 8223 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 8224 | { |
a01bda52 | 8225 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
8226 | regcache_read_pc (regcache), remove_wps, |
8227 | ecs->event_thread->global_num); | |
45e8c884 | 8228 | } |
963f9c80 | 8229 | else if (remove_wps) |
21edc42f | 8230 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
8231 | |
8232 | /* If we now need to do an in-line step-over, we need to stop | |
8233 | all other threads. Note this must be done before | |
8234 | insert_breakpoints below, because that removes the breakpoint | |
8235 | we're about to step over, otherwise other threads could miss | |
8236 | it. */ | |
fbea99ea | 8237 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
4f5539f0 | 8238 | stop_all_threads ("starting in-line step-over"); |
abbb1732 | 8239 | |
31e77af2 | 8240 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 8241 | try |
31e77af2 PA |
8242 | { |
8243 | insert_breakpoints (); | |
8244 | } | |
230d2906 | 8245 | catch (const gdb_exception_error &e) |
31e77af2 PA |
8246 | { |
8247 | exception_print (gdb_stderr, e); | |
22bcd14b | 8248 | stop_waiting (ecs); |
bdf2a94a | 8249 | clear_step_over_info (); |
31e77af2 | 8250 | return; |
d4f3574e SS |
8251 | } |
8252 | ||
963f9c80 | 8253 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 8254 | |
1edb66d8 | 8255 | resume (ecs->event_thread->stop_signal ()); |
d4f3574e SS |
8256 | } |
8257 | ||
488f131b | 8258 | prepare_to_wait (ecs); |
d4f3574e SS |
8259 | } |
8260 | ||
4d9d9d04 PA |
8261 | /* Called when we should continue running the inferior, because the |
8262 | current event doesn't cause a user visible stop. This does the | |
8263 | resuming part; waiting for the next event is done elsewhere. */ | |
8264 | ||
8265 | static void | |
8266 | keep_going (struct execution_control_state *ecs) | |
8267 | { | |
8268 | if (ecs->event_thread->control.trap_expected | |
1edb66d8 | 8269 | && ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP) |
4d9d9d04 PA |
8270 | ecs->event_thread->control.trap_expected = 0; |
8271 | ||
1edb66d8 SM |
8272 | if (!signal_program[ecs->event_thread->stop_signal ()]) |
8273 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
4d9d9d04 PA |
8274 | keep_going_pass_signal (ecs); |
8275 | } | |
8276 | ||
104c1213 JM |
8277 | /* This function normally comes after a resume, before |
8278 | handle_inferior_event exits. It takes care of any last bits of | |
8279 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 8280 | |
104c1213 JM |
8281 | static void |
8282 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 8283 | { |
1eb8556f | 8284 | infrun_debug_printf ("prepare_to_wait"); |
104c1213 | 8285 | |
104c1213 | 8286 | ecs->wait_some_more = 1; |
0b333c5e | 8287 | |
42bd97a6 PA |
8288 | /* If the target can't async, emulate it by marking the infrun event |
8289 | handler such that as soon as we get back to the event-loop, we | |
8290 | immediately end up in fetch_inferior_event again calling | |
8291 | target_wait. */ | |
8292 | if (!target_can_async_p ()) | |
0b333c5e | 8293 | mark_infrun_async_event_handler (); |
c906108c | 8294 | } |
11cf8741 | 8295 | |
fd664c91 | 8296 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 8297 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
8298 | |
8299 | static void | |
bdc36728 | 8300 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 8301 | { |
bdc36728 | 8302 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 8303 | stop_waiting (ecs); |
fd664c91 PA |
8304 | } |
8305 | ||
33d62d64 JK |
8306 | /* Several print_*_reason functions to print why the inferior has stopped. |
8307 | We always print something when the inferior exits, or receives a signal. | |
8308 | The rest of the cases are dealt with later on in normal_stop and | |
8309 | print_it_typical. Ideally there should be a call to one of these | |
8310 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 8311 | stop_waiting is called. |
33d62d64 | 8312 | |
fd664c91 PA |
8313 | Note that we don't call these directly, instead we delegate that to |
8314 | the interpreters, through observers. Interpreters then call these | |
8315 | with whatever uiout is right. */ | |
33d62d64 | 8316 | |
fd664c91 PA |
8317 | void |
8318 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 8319 | { |
fd664c91 | 8320 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 8321 | |
112e8700 | 8322 | if (uiout->is_mi_like_p ()) |
fd664c91 | 8323 | { |
112e8700 | 8324 | uiout->field_string ("reason", |
fd664c91 PA |
8325 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
8326 | } | |
8327 | } | |
33d62d64 | 8328 | |
fd664c91 PA |
8329 | void |
8330 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 8331 | { |
33d62d64 | 8332 | annotate_signalled (); |
112e8700 SM |
8333 | if (uiout->is_mi_like_p ()) |
8334 | uiout->field_string | |
8335 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8336 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 8337 | annotate_signal_name (); |
112e8700 | 8338 | uiout->field_string ("signal-name", |
2ea28649 | 8339 | gdb_signal_to_name (siggnal)); |
33d62d64 | 8340 | annotate_signal_name_end (); |
112e8700 | 8341 | uiout->text (", "); |
33d62d64 | 8342 | annotate_signal_string (); |
112e8700 | 8343 | uiout->field_string ("signal-meaning", |
2ea28649 | 8344 | gdb_signal_to_string (siggnal)); |
33d62d64 | 8345 | annotate_signal_string_end (); |
112e8700 SM |
8346 | uiout->text (".\n"); |
8347 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
8348 | } |
8349 | ||
fd664c91 PA |
8350 | void |
8351 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 8352 | { |
fda326dd | 8353 | struct inferior *inf = current_inferior (); |
a068643d | 8354 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 8355 | |
33d62d64 JK |
8356 | annotate_exited (exitstatus); |
8357 | if (exitstatus) | |
8358 | { | |
112e8700 SM |
8359 | if (uiout->is_mi_like_p ()) |
8360 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
8361 | std::string exit_code_str |
8362 | = string_printf ("0%o", (unsigned int) exitstatus); | |
8363 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
8364 | plongest (inf->num), pidstr.c_str (), | |
8365 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
8366 | } |
8367 | else | |
11cf8741 | 8368 | { |
112e8700 SM |
8369 | if (uiout->is_mi_like_p ()) |
8370 | uiout->field_string | |
8371 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
8372 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
8373 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 8374 | } |
33d62d64 JK |
8375 | } |
8376 | ||
fd664c91 PA |
8377 | void |
8378 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 8379 | { |
f303dbd6 PA |
8380 | struct thread_info *thr = inferior_thread (); |
8381 | ||
33d62d64 JK |
8382 | annotate_signal (); |
8383 | ||
112e8700 | 8384 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
8385 | ; |
8386 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 8387 | { |
112e8700 | 8388 | uiout->text ("\nThread "); |
33eca680 | 8389 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 | 8390 | |
25558938 | 8391 | const char *name = thread_name (thr); |
f303dbd6 PA |
8392 | if (name != NULL) |
8393 | { | |
112e8700 | 8394 | uiout->text (" \""); |
33eca680 | 8395 | uiout->field_string ("name", name); |
112e8700 | 8396 | uiout->text ("\""); |
f303dbd6 | 8397 | } |
33d62d64 | 8398 | } |
f303dbd6 | 8399 | else |
112e8700 | 8400 | uiout->text ("\nProgram"); |
f303dbd6 | 8401 | |
112e8700 SM |
8402 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8403 | uiout->text (" stopped"); | |
33d62d64 JK |
8404 | else |
8405 | { | |
112e8700 | 8406 | uiout->text (" received signal "); |
8b93c638 | 8407 | annotate_signal_name (); |
112e8700 SM |
8408 | if (uiout->is_mi_like_p ()) |
8409 | uiout->field_string | |
8410 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8411 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8412 | annotate_signal_name_end (); |
112e8700 | 8413 | uiout->text (", "); |
8b93c638 | 8414 | annotate_signal_string (); |
112e8700 | 8415 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 | 8416 | |
272bb05c JB |
8417 | struct regcache *regcache = get_current_regcache (); |
8418 | struct gdbarch *gdbarch = regcache->arch (); | |
8419 | if (gdbarch_report_signal_info_p (gdbarch)) | |
8420 | gdbarch_report_signal_info (gdbarch, uiout, siggnal); | |
8421 | ||
8b93c638 | 8422 | annotate_signal_string_end (); |
33d62d64 | 8423 | } |
112e8700 | 8424 | uiout->text (".\n"); |
33d62d64 | 8425 | } |
252fbfc8 | 8426 | |
fd664c91 PA |
8427 | void |
8428 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8429 | { |
112e8700 | 8430 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8431 | } |
43ff13b4 | 8432 | |
0c7e1a46 PA |
8433 | /* Print current location without a level number, if we have changed |
8434 | functions or hit a breakpoint. Print source line if we have one. | |
8435 | bpstat_print contains the logic deciding in detail what to print, | |
8436 | based on the event(s) that just occurred. */ | |
8437 | ||
243a9253 | 8438 | static void |
c272a98c | 8439 | print_stop_location (const target_waitstatus &ws) |
0c7e1a46 PA |
8440 | { |
8441 | int bpstat_ret; | |
f486487f | 8442 | enum print_what source_flag; |
0c7e1a46 PA |
8443 | int do_frame_printing = 1; |
8444 | struct thread_info *tp = inferior_thread (); | |
8445 | ||
c272a98c | 8446 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws.kind ()); |
0c7e1a46 PA |
8447 | switch (bpstat_ret) |
8448 | { | |
8449 | case PRINT_UNKNOWN: | |
8450 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8451 | should) carry around the function and does (or should) use | |
8452 | that when doing a frame comparison. */ | |
8453 | if (tp->control.stop_step | |
8454 | && frame_id_eq (tp->control.step_frame_id, | |
8455 | get_frame_id (get_current_frame ())) | |
f2ffa92b | 8456 | && (tp->control.step_start_function |
1edb66d8 | 8457 | == find_pc_function (tp->stop_pc ()))) |
0c7e1a46 PA |
8458 | { |
8459 | /* Finished step, just print source line. */ | |
8460 | source_flag = SRC_LINE; | |
8461 | } | |
8462 | else | |
8463 | { | |
8464 | /* Print location and source line. */ | |
8465 | source_flag = SRC_AND_LOC; | |
8466 | } | |
8467 | break; | |
8468 | case PRINT_SRC_AND_LOC: | |
8469 | /* Print location and source line. */ | |
8470 | source_flag = SRC_AND_LOC; | |
8471 | break; | |
8472 | case PRINT_SRC_ONLY: | |
8473 | source_flag = SRC_LINE; | |
8474 | break; | |
8475 | case PRINT_NOTHING: | |
8476 | /* Something bogus. */ | |
8477 | source_flag = SRC_LINE; | |
8478 | do_frame_printing = 0; | |
8479 | break; | |
8480 | default: | |
8481 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8482 | } | |
8483 | ||
8484 | /* The behavior of this routine with respect to the source | |
8485 | flag is: | |
8486 | SRC_LINE: Print only source line | |
8487 | LOCATION: Print only location | |
8488 | SRC_AND_LOC: Print location and source line. */ | |
8489 | if (do_frame_printing) | |
8490 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8491 | } |
8492 | ||
243a9253 PA |
8493 | /* See infrun.h. */ |
8494 | ||
8495 | void | |
4c7d57e7 | 8496 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8497 | { |
243a9253 | 8498 | struct target_waitstatus last; |
243a9253 PA |
8499 | struct thread_info *tp; |
8500 | ||
5b6d1e4f | 8501 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8502 | |
67ad9399 TT |
8503 | { |
8504 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8505 | |
c272a98c | 8506 | print_stop_location (last); |
243a9253 | 8507 | |
67ad9399 | 8508 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8509 | if (displays) |
8510 | do_displays (); | |
67ad9399 | 8511 | } |
243a9253 PA |
8512 | |
8513 | tp = inferior_thread (); | |
573269a8 LS |
8514 | if (tp->thread_fsm () != nullptr |
8515 | && tp->thread_fsm ()->finished_p ()) | |
243a9253 PA |
8516 | { |
8517 | struct return_value_info *rv; | |
8518 | ||
573269a8 LS |
8519 | rv = tp->thread_fsm ()->return_value (); |
8520 | if (rv != nullptr) | |
243a9253 PA |
8521 | print_return_value (uiout, rv); |
8522 | } | |
0c7e1a46 PA |
8523 | } |
8524 | ||
388a7084 PA |
8525 | /* See infrun.h. */ |
8526 | ||
8527 | void | |
8528 | maybe_remove_breakpoints (void) | |
8529 | { | |
55f6301a | 8530 | if (!breakpoints_should_be_inserted_now () && target_has_execution ()) |
388a7084 PA |
8531 | { |
8532 | if (remove_breakpoints ()) | |
8533 | { | |
223ffa71 | 8534 | target_terminal::ours_for_output (); |
6cb06a8c TT |
8535 | gdb_printf (_("Cannot remove breakpoints because " |
8536 | "program is no longer writable.\nFurther " | |
8537 | "execution is probably impossible.\n")); | |
388a7084 PA |
8538 | } |
8539 | } | |
8540 | } | |
8541 | ||
4c2f2a79 PA |
8542 | /* The execution context that just caused a normal stop. */ |
8543 | ||
8544 | struct stop_context | |
8545 | { | |
2d844eaf | 8546 | stop_context (); |
2d844eaf TT |
8547 | |
8548 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8549 | ||
8550 | bool changed () const; | |
8551 | ||
4c2f2a79 PA |
8552 | /* The stop ID. */ |
8553 | ULONGEST stop_id; | |
c906108c | 8554 | |
4c2f2a79 | 8555 | /* The event PTID. */ |
c906108c | 8556 | |
4c2f2a79 PA |
8557 | ptid_t ptid; |
8558 | ||
8559 | /* If stopp for a thread event, this is the thread that caused the | |
8560 | stop. */ | |
d634cd0b | 8561 | thread_info_ref thread; |
4c2f2a79 PA |
8562 | |
8563 | /* The inferior that caused the stop. */ | |
8564 | int inf_num; | |
8565 | }; | |
8566 | ||
2d844eaf | 8567 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8568 | takes a strong reference to the thread. */ |
8569 | ||
2d844eaf | 8570 | stop_context::stop_context () |
4c2f2a79 | 8571 | { |
2d844eaf TT |
8572 | stop_id = get_stop_id (); |
8573 | ptid = inferior_ptid; | |
8574 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8575 | |
d7e15655 | 8576 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8577 | { |
8578 | /* Take a strong reference so that the thread can't be deleted | |
8579 | yet. */ | |
d634cd0b | 8580 | thread = thread_info_ref::new_reference (inferior_thread ()); |
4c2f2a79 | 8581 | } |
4c2f2a79 PA |
8582 | } |
8583 | ||
8584 | /* Return true if the current context no longer matches the saved stop | |
8585 | context. */ | |
8586 | ||
2d844eaf TT |
8587 | bool |
8588 | stop_context::changed () const | |
8589 | { | |
8590 | if (ptid != inferior_ptid) | |
8591 | return true; | |
8592 | if (inf_num != current_inferior ()->num) | |
8593 | return true; | |
8594 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8595 | return true; | |
8596 | if (get_stop_id () != stop_id) | |
8597 | return true; | |
8598 | return false; | |
4c2f2a79 PA |
8599 | } |
8600 | ||
8601 | /* See infrun.h. */ | |
8602 | ||
8603 | int | |
96baa820 | 8604 | normal_stop (void) |
c906108c | 8605 | { |
73b65bb0 | 8606 | struct target_waitstatus last; |
73b65bb0 | 8607 | |
5b6d1e4f | 8608 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8609 | |
4c2f2a79 PA |
8610 | new_stop_id (); |
8611 | ||
29f49a6a PA |
8612 | /* If an exception is thrown from this point on, make sure to |
8613 | propagate GDB's knowledge of the executing state to the | |
8614 | frontend/user running state. A QUIT is an easy exception to see | |
8615 | here, so do this before any filtered output. */ | |
731f534f | 8616 | |
5b6d1e4f | 8617 | ptid_t finish_ptid = null_ptid; |
731f534f | 8618 | |
c35b1492 | 8619 | if (!non_stop) |
5b6d1e4f | 8620 | finish_ptid = minus_one_ptid; |
183be222 SM |
8621 | else if (last.kind () == TARGET_WAITKIND_SIGNALLED |
8622 | || last.kind () == TARGET_WAITKIND_EXITED) | |
e1316e60 PA |
8623 | { |
8624 | /* On some targets, we may still have live threads in the | |
8625 | inferior when we get a process exit event. E.g., for | |
8626 | "checkpoint", when the current checkpoint/fork exits, | |
8627 | linux-fork.c automatically switches to another fork from | |
8628 | within target_mourn_inferior. */ | |
731f534f | 8629 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8630 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 | 8631 | } |
183be222 | 8632 | else if (last.kind () != TARGET_WAITKIND_NO_RESUMED) |
5b6d1e4f PA |
8633 | finish_ptid = inferior_ptid; |
8634 | ||
8635 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8636 | if (finish_ptid != null_ptid) | |
8637 | { | |
8638 | maybe_finish_thread_state.emplace | |
8639 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8640 | } | |
29f49a6a | 8641 | |
b57bacec PA |
8642 | /* As we're presenting a stop, and potentially removing breakpoints, |
8643 | update the thread list so we can tell whether there are threads | |
8644 | running on the target. With target remote, for example, we can | |
8645 | only learn about new threads when we explicitly update the thread | |
8646 | list. Do this before notifying the interpreters about signal | |
8647 | stops, end of stepping ranges, etc., so that the "new thread" | |
8648 | output is emitted before e.g., "Program received signal FOO", | |
8649 | instead of after. */ | |
8650 | update_thread_list (); | |
8651 | ||
183be222 | 8652 | if (last.kind () == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) |
1edb66d8 | 8653 | gdb::observers::signal_received.notify (inferior_thread ()->stop_signal ()); |
b57bacec | 8654 | |
c906108c SS |
8655 | /* As with the notification of thread events, we want to delay |
8656 | notifying the user that we've switched thread context until | |
8657 | the inferior actually stops. | |
8658 | ||
73b65bb0 DJ |
8659 | There's no point in saying anything if the inferior has exited. |
8660 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8661 | "received a signal". |
8662 | ||
8663 | Also skip saying anything in non-stop mode. In that mode, as we | |
8664 | don't want GDB to switch threads behind the user's back, to avoid | |
8665 | races where the user is typing a command to apply to thread x, | |
8666 | but GDB switches to thread y before the user finishes entering | |
8667 | the command, fetch_inferior_event installs a cleanup to restore | |
8668 | the current thread back to the thread the user had selected right | |
8669 | after this event is handled, so we're not really switching, only | |
8670 | informing of a stop. */ | |
4f8d22e3 | 8671 | if (!non_stop |
731f534f | 8672 | && previous_inferior_ptid != inferior_ptid |
55f6301a | 8673 | && target_has_execution () |
183be222 SM |
8674 | && last.kind () != TARGET_WAITKIND_SIGNALLED |
8675 | && last.kind () != TARGET_WAITKIND_EXITED | |
8676 | && last.kind () != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8677 | { |
0e454242 | 8678 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8679 | { |
223ffa71 | 8680 | target_terminal::ours_for_output (); |
6cb06a8c TT |
8681 | gdb_printf (_("[Switching to %s]\n"), |
8682 | target_pid_to_str (inferior_ptid).c_str ()); | |
3b12939d PA |
8683 | annotate_thread_changed (); |
8684 | } | |
39f77062 | 8685 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8686 | } |
c906108c | 8687 | |
183be222 | 8688 | if (last.kind () == TARGET_WAITKIND_NO_RESUMED) |
0e5bf2a8 | 8689 | { |
0e454242 | 8690 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8691 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8692 | { | |
223ffa71 | 8693 | target_terminal::ours_for_output (); |
6cb06a8c | 8694 | gdb_printf (_("No unwaited-for children left.\n")); |
3b12939d | 8695 | } |
0e5bf2a8 PA |
8696 | } |
8697 | ||
b57bacec | 8698 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8699 | maybe_remove_breakpoints (); |
c906108c | 8700 | |
c906108c SS |
8701 | /* If an auto-display called a function and that got a signal, |
8702 | delete that auto-display to avoid an infinite recursion. */ | |
8703 | ||
8704 | if (stopped_by_random_signal) | |
8705 | disable_current_display (); | |
8706 | ||
0e454242 | 8707 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8708 | { |
8709 | async_enable_stdin (); | |
8710 | } | |
c906108c | 8711 | |
388a7084 | 8712 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8713 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8714 | |
8715 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8716 | and current location is based on that. Handle the case where the | |
8717 | dummy call is returning after being stopped. E.g. the dummy call | |
8718 | previously hit a breakpoint. (If the dummy call returns | |
8719 | normally, we won't reach here.) Do this before the stop hook is | |
8720 | run, so that it doesn't get to see the temporary dummy frame, | |
8721 | which is not where we'll present the stop. */ | |
8722 | if (has_stack_frames ()) | |
8723 | { | |
8724 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8725 | { | |
8726 | /* Pop the empty frame that contains the stack dummy. This | |
8727 | also restores inferior state prior to the call (struct | |
8728 | infcall_suspend_state). */ | |
8729 | struct frame_info *frame = get_current_frame (); | |
8730 | ||
8731 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8732 | frame_pop (frame); | |
8733 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8734 | does which means there's now no selected frame. */ | |
8735 | } | |
8736 | ||
8737 | select_frame (get_current_frame ()); | |
8738 | ||
8739 | /* Set the current source location. */ | |
8740 | set_current_sal_from_frame (get_current_frame ()); | |
8741 | } | |
dd7e2d2b PA |
8742 | |
8743 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8744 | of stop_command's pre-hook not existing). */ | |
49a82d50 | 8745 | stop_context saved_context; |
4c2f2a79 | 8746 | |
49a82d50 TT |
8747 | try |
8748 | { | |
8749 | execute_cmd_pre_hook (stop_command); | |
4c2f2a79 | 8750 | } |
49a82d50 TT |
8751 | catch (const gdb_exception &ex) |
8752 | { | |
8753 | exception_fprintf (gdb_stderr, ex, | |
8754 | "Error while running hook_stop:\n"); | |
8755 | } | |
8756 | ||
8757 | /* If the stop hook resumes the target, then there's no point in | |
8758 | trying to notify about the previous stop; its context is | |
8759 | gone. Likewise if the command switches thread or inferior -- | |
8760 | the observers would print a stop for the wrong | |
8761 | thread/inferior. */ | |
8762 | if (saved_context.changed ()) | |
8763 | return 1; | |
dd7e2d2b | 8764 | |
388a7084 PA |
8765 | /* Notify observers about the stop. This is where the interpreters |
8766 | print the stop event. */ | |
d7e15655 | 8767 | if (inferior_ptid != null_ptid) |
76727919 | 8768 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
24a7f1b5 | 8769 | stop_print_frame); |
388a7084 | 8770 | else |
76727919 | 8771 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8772 | |
243a9253 PA |
8773 | annotate_stopped (); |
8774 | ||
55f6301a | 8775 | if (target_has_execution ()) |
48844aa6 | 8776 | { |
183be222 SM |
8777 | if (last.kind () != TARGET_WAITKIND_SIGNALLED |
8778 | && last.kind () != TARGET_WAITKIND_EXITED | |
8779 | && last.kind () != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8780 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8781 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8782 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8783 | } |
6c95b8df | 8784 | |
4c2f2a79 | 8785 | return 0; |
c906108c | 8786 | } |
c906108c | 8787 | \f |
c5aa993b | 8788 | int |
96baa820 | 8789 | signal_stop_state (int signo) |
c906108c | 8790 | { |
d6b48e9c | 8791 | return signal_stop[signo]; |
c906108c SS |
8792 | } |
8793 | ||
c5aa993b | 8794 | int |
96baa820 | 8795 | signal_print_state (int signo) |
c906108c SS |
8796 | { |
8797 | return signal_print[signo]; | |
8798 | } | |
8799 | ||
c5aa993b | 8800 | int |
96baa820 | 8801 | signal_pass_state (int signo) |
c906108c SS |
8802 | { |
8803 | return signal_program[signo]; | |
8804 | } | |
8805 | ||
2455069d UW |
8806 | static void |
8807 | signal_cache_update (int signo) | |
8808 | { | |
8809 | if (signo == -1) | |
8810 | { | |
a493e3e2 | 8811 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8812 | signal_cache_update (signo); |
8813 | ||
8814 | return; | |
8815 | } | |
8816 | ||
8817 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8818 | && signal_print[signo] == 0 | |
ab04a2af TT |
8819 | && signal_program[signo] == 1 |
8820 | && signal_catch[signo] == 0); | |
2455069d UW |
8821 | } |
8822 | ||
488f131b | 8823 | int |
7bda5e4a | 8824 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8825 | { |
8826 | int ret = signal_stop[signo]; | |
abbb1732 | 8827 | |
d4f3574e | 8828 | signal_stop[signo] = state; |
2455069d | 8829 | signal_cache_update (signo); |
d4f3574e SS |
8830 | return ret; |
8831 | } | |
8832 | ||
488f131b | 8833 | int |
7bda5e4a | 8834 | signal_print_update (int signo, int state) |
d4f3574e SS |
8835 | { |
8836 | int ret = signal_print[signo]; | |
abbb1732 | 8837 | |
d4f3574e | 8838 | signal_print[signo] = state; |
2455069d | 8839 | signal_cache_update (signo); |
d4f3574e SS |
8840 | return ret; |
8841 | } | |
8842 | ||
488f131b | 8843 | int |
7bda5e4a | 8844 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8845 | { |
8846 | int ret = signal_program[signo]; | |
abbb1732 | 8847 | |
d4f3574e | 8848 | signal_program[signo] = state; |
2455069d | 8849 | signal_cache_update (signo); |
d4f3574e SS |
8850 | return ret; |
8851 | } | |
8852 | ||
ab04a2af TT |
8853 | /* Update the global 'signal_catch' from INFO and notify the |
8854 | target. */ | |
8855 | ||
8856 | void | |
8857 | signal_catch_update (const unsigned int *info) | |
8858 | { | |
8859 | int i; | |
8860 | ||
8861 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8862 | signal_catch[i] = info[i] > 0; | |
8863 | signal_cache_update (-1); | |
adc6a863 | 8864 | target_pass_signals (signal_pass); |
ab04a2af TT |
8865 | } |
8866 | ||
c906108c | 8867 | static void |
96baa820 | 8868 | sig_print_header (void) |
c906108c | 8869 | { |
6cb06a8c TT |
8870 | gdb_printf (_("Signal Stop\tPrint\tPass " |
8871 | "to program\tDescription\n")); | |
c906108c SS |
8872 | } |
8873 | ||
8874 | static void | |
2ea28649 | 8875 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8876 | { |
2ea28649 | 8877 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8878 | int name_padding = 13 - strlen (name); |
96baa820 | 8879 | |
c906108c SS |
8880 | if (name_padding <= 0) |
8881 | name_padding = 0; | |
8882 | ||
6cb06a8c TT |
8883 | gdb_printf ("%s", name); |
8884 | gdb_printf ("%*.*s ", name_padding, name_padding, " "); | |
8885 | gdb_printf ("%s\t", signal_stop[oursig] ? "Yes" : "No"); | |
8886 | gdb_printf ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8887 | gdb_printf ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
8888 | gdb_printf ("%s\n", gdb_signal_to_string (oursig)); | |
c906108c SS |
8889 | } |
8890 | ||
8891 | /* Specify how various signals in the inferior should be handled. */ | |
8892 | ||
8893 | static void | |
0b39b52e | 8894 | handle_command (const char *args, int from_tty) |
c906108c | 8895 | { |
c906108c | 8896 | int digits, wordlen; |
b926417a | 8897 | int sigfirst, siglast; |
2ea28649 | 8898 | enum gdb_signal oursig; |
c906108c | 8899 | int allsigs; |
c906108c SS |
8900 | |
8901 | if (args == NULL) | |
8902 | { | |
e2e0b3e5 | 8903 | error_no_arg (_("signal to handle")); |
c906108c SS |
8904 | } |
8905 | ||
1777feb0 | 8906 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8907 | |
adc6a863 PA |
8908 | const size_t nsigs = GDB_SIGNAL_LAST; |
8909 | unsigned char sigs[nsigs] {}; | |
c906108c | 8910 | |
1777feb0 | 8911 | /* Break the command line up into args. */ |
c906108c | 8912 | |
773a1edc | 8913 | gdb_argv built_argv (args); |
c906108c SS |
8914 | |
8915 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8916 | actions. Signal numbers and signal names may be interspersed with | |
8917 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8918 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8919 | |
773a1edc | 8920 | for (char *arg : built_argv) |
c906108c | 8921 | { |
773a1edc TT |
8922 | wordlen = strlen (arg); |
8923 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8924 | {; |
8925 | } | |
8926 | allsigs = 0; | |
8927 | sigfirst = siglast = -1; | |
8928 | ||
773a1edc | 8929 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8930 | { |
8931 | /* Apply action to all signals except those used by the | |
1777feb0 | 8932 | debugger. Silently skip those. */ |
c906108c SS |
8933 | allsigs = 1; |
8934 | sigfirst = 0; | |
8935 | siglast = nsigs - 1; | |
8936 | } | |
773a1edc | 8937 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8938 | { |
8939 | SET_SIGS (nsigs, sigs, signal_stop); | |
8940 | SET_SIGS (nsigs, sigs, signal_print); | |
8941 | } | |
773a1edc | 8942 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8943 | { |
8944 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8945 | } | |
773a1edc | 8946 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8947 | { |
8948 | SET_SIGS (nsigs, sigs, signal_print); | |
8949 | } | |
773a1edc | 8950 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8951 | { |
8952 | SET_SIGS (nsigs, sigs, signal_program); | |
8953 | } | |
773a1edc | 8954 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8955 | { |
8956 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8957 | } | |
773a1edc | 8958 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8959 | { |
8960 | SET_SIGS (nsigs, sigs, signal_program); | |
8961 | } | |
773a1edc | 8962 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8963 | { |
8964 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8965 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8966 | } | |
773a1edc | 8967 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8968 | { |
8969 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8970 | } | |
8971 | else if (digits > 0) | |
8972 | { | |
8973 | /* It is numeric. The numeric signal refers to our own | |
8974 | internal signal numbering from target.h, not to host/target | |
8975 | signal number. This is a feature; users really should be | |
8976 | using symbolic names anyway, and the common ones like | |
8977 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8978 | ||
8979 | sigfirst = siglast = (int) | |
773a1edc TT |
8980 | gdb_signal_from_command (atoi (arg)); |
8981 | if (arg[digits] == '-') | |
c906108c SS |
8982 | { |
8983 | siglast = (int) | |
773a1edc | 8984 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8985 | } |
8986 | if (sigfirst > siglast) | |
8987 | { | |
1777feb0 | 8988 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8989 | std::swap (sigfirst, siglast); |
c906108c SS |
8990 | } |
8991 | } | |
8992 | else | |
8993 | { | |
773a1edc | 8994 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8995 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8996 | { |
8997 | sigfirst = siglast = (int) oursig; | |
8998 | } | |
8999 | else | |
9000 | { | |
9001 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 9002 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
9003 | } |
9004 | } | |
9005 | ||
9006 | /* If any signal numbers or symbol names were found, set flags for | |
dda83cd7 | 9007 | which signals to apply actions to. */ |
c906108c | 9008 | |
b926417a | 9009 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 9010 | { |
2ea28649 | 9011 | switch ((enum gdb_signal) signum) |
c906108c | 9012 | { |
a493e3e2 PA |
9013 | case GDB_SIGNAL_TRAP: |
9014 | case GDB_SIGNAL_INT: | |
c906108c SS |
9015 | if (!allsigs && !sigs[signum]) |
9016 | { | |
9e2f0ad4 | 9017 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 9018 | Are you sure you want to change it? "), |
2ea28649 | 9019 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
9020 | { |
9021 | sigs[signum] = 1; | |
9022 | } | |
9023 | else | |
6cb06a8c | 9024 | gdb_printf (_("Not confirmed, unchanged.\n")); |
c906108c SS |
9025 | } |
9026 | break; | |
a493e3e2 PA |
9027 | case GDB_SIGNAL_0: |
9028 | case GDB_SIGNAL_DEFAULT: | |
9029 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
9030 | /* Make sure that "all" doesn't print these. */ |
9031 | break; | |
9032 | default: | |
9033 | sigs[signum] = 1; | |
9034 | break; | |
9035 | } | |
9036 | } | |
c906108c SS |
9037 | } |
9038 | ||
b926417a | 9039 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
9040 | if (sigs[signum]) |
9041 | { | |
2455069d | 9042 | signal_cache_update (-1); |
adc6a863 PA |
9043 | target_pass_signals (signal_pass); |
9044 | target_program_signals (signal_program); | |
c906108c | 9045 | |
3a031f65 PA |
9046 | if (from_tty) |
9047 | { | |
9048 | /* Show the results. */ | |
9049 | sig_print_header (); | |
9050 | for (; signum < nsigs; signum++) | |
9051 | if (sigs[signum]) | |
aead7601 | 9052 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
9053 | } |
9054 | ||
9055 | break; | |
9056 | } | |
c906108c SS |
9057 | } |
9058 | ||
de0bea00 MF |
9059 | /* Complete the "handle" command. */ |
9060 | ||
eb3ff9a5 | 9061 | static void |
de0bea00 | 9062 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 9063 | completion_tracker &tracker, |
6f937416 | 9064 | const char *text, const char *word) |
de0bea00 | 9065 | { |
de0bea00 MF |
9066 | static const char * const keywords[] = |
9067 | { | |
9068 | "all", | |
9069 | "stop", | |
9070 | "ignore", | |
9071 | "print", | |
9072 | "pass", | |
9073 | "nostop", | |
9074 | "noignore", | |
9075 | "noprint", | |
9076 | "nopass", | |
9077 | NULL, | |
9078 | }; | |
9079 | ||
eb3ff9a5 PA |
9080 | signal_completer (ignore, tracker, text, word); |
9081 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
9082 | } |
9083 | ||
2ea28649 PA |
9084 | enum gdb_signal |
9085 | gdb_signal_from_command (int num) | |
ed01b82c PA |
9086 | { |
9087 | if (num >= 1 && num <= 15) | |
2ea28649 | 9088 | return (enum gdb_signal) num; |
ed01b82c PA |
9089 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
9090 | Use \"info signals\" for a list of symbolic signals.")); | |
9091 | } | |
9092 | ||
c906108c SS |
9093 | /* Print current contents of the tables set by the handle command. |
9094 | It is possible we should just be printing signals actually used | |
9095 | by the current target (but for things to work right when switching | |
9096 | targets, all signals should be in the signal tables). */ | |
9097 | ||
9098 | static void | |
1d12d88f | 9099 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 9100 | { |
2ea28649 | 9101 | enum gdb_signal oursig; |
abbb1732 | 9102 | |
c906108c SS |
9103 | sig_print_header (); |
9104 | ||
9105 | if (signum_exp) | |
9106 | { | |
9107 | /* First see if this is a symbol name. */ | |
2ea28649 | 9108 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 9109 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
9110 | { |
9111 | /* No, try numeric. */ | |
9112 | oursig = | |
2ea28649 | 9113 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
9114 | } |
9115 | sig_print_info (oursig); | |
9116 | return; | |
9117 | } | |
9118 | ||
6cb06a8c | 9119 | gdb_printf ("\n"); |
c906108c | 9120 | /* These ugly casts brought to you by the native VAX compiler. */ |
a493e3e2 PA |
9121 | for (oursig = GDB_SIGNAL_FIRST; |
9122 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 9123 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
9124 | { |
9125 | QUIT; | |
9126 | ||
a493e3e2 PA |
9127 | if (oursig != GDB_SIGNAL_UNKNOWN |
9128 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
9129 | sig_print_info (oursig); |
9130 | } | |
9131 | ||
6cb06a8c TT |
9132 | gdb_printf (_("\nUse the \"handle\" command " |
9133 | "to change these tables.\n")); | |
c906108c | 9134 | } |
4aa995e1 PA |
9135 | |
9136 | /* The $_siginfo convenience variable is a bit special. We don't know | |
9137 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 9138 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
9139 | also dependent on which thread you have selected. |
9140 | ||
9141 | 1. making $_siginfo be an internalvar that creates a new value on | |
9142 | access. | |
9143 | ||
9144 | 2. making the value of $_siginfo be an lval_computed value. */ | |
9145 | ||
9146 | /* This function implements the lval_computed support for reading a | |
9147 | $_siginfo value. */ | |
9148 | ||
9149 | static void | |
9150 | siginfo_value_read (struct value *v) | |
9151 | { | |
9152 | LONGEST transferred; | |
9153 | ||
a911d87a PA |
9154 | /* If we can access registers, so can we access $_siginfo. Likewise |
9155 | vice versa. */ | |
9156 | validate_registers_access (); | |
c709acd1 | 9157 | |
4aa995e1 | 9158 | transferred = |
328d42d8 SM |
9159 | target_read (current_inferior ()->top_target (), |
9160 | TARGET_OBJECT_SIGNAL_INFO, | |
4aa995e1 | 9161 | NULL, |
50888e42 | 9162 | value_contents_all_raw (v).data (), |
4aa995e1 PA |
9163 | value_offset (v), |
9164 | TYPE_LENGTH (value_type (v))); | |
9165 | ||
9166 | if (transferred != TYPE_LENGTH (value_type (v))) | |
9167 | error (_("Unable to read siginfo")); | |
9168 | } | |
9169 | ||
9170 | /* This function implements the lval_computed support for writing a | |
9171 | $_siginfo value. */ | |
9172 | ||
9173 | static void | |
9174 | siginfo_value_write (struct value *v, struct value *fromval) | |
9175 | { | |
9176 | LONGEST transferred; | |
9177 | ||
a911d87a PA |
9178 | /* If we can access registers, so can we access $_siginfo. Likewise |
9179 | vice versa. */ | |
9180 | validate_registers_access (); | |
c709acd1 | 9181 | |
328d42d8 | 9182 | transferred = target_write (current_inferior ()->top_target (), |
4aa995e1 PA |
9183 | TARGET_OBJECT_SIGNAL_INFO, |
9184 | NULL, | |
50888e42 | 9185 | value_contents_all_raw (fromval).data (), |
4aa995e1 PA |
9186 | value_offset (v), |
9187 | TYPE_LENGTH (value_type (fromval))); | |
9188 | ||
9189 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
9190 | error (_("Unable to write siginfo")); | |
9191 | } | |
9192 | ||
c8f2448a | 9193 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
9194 | { |
9195 | siginfo_value_read, | |
9196 | siginfo_value_write | |
9197 | }; | |
9198 | ||
9199 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
9200 | the current thread using architecture GDBARCH. Return a void value |
9201 | if there's no object available. */ | |
4aa995e1 | 9202 | |
2c0b251b | 9203 | static struct value * |
22d2b532 SDJ |
9204 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
9205 | void *ignore) | |
4aa995e1 | 9206 | { |
841de120 | 9207 | if (target_has_stack () |
d7e15655 | 9208 | && inferior_ptid != null_ptid |
78267919 | 9209 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 9210 | { |
78267919 | 9211 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 9212 | |
78267919 | 9213 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
9214 | } |
9215 | ||
78267919 | 9216 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
9217 | } |
9218 | ||
c906108c | 9219 | \f |
16c381f0 JK |
9220 | /* infcall_suspend_state contains state about the program itself like its |
9221 | registers and any signal it received when it last stopped. | |
9222 | This state must be restored regardless of how the inferior function call | |
9223 | ends (either successfully, or after it hits a breakpoint or signal) | |
9224 | if the program is to properly continue where it left off. */ | |
9225 | ||
6bf78e29 | 9226 | class infcall_suspend_state |
7a292a7a | 9227 | { |
6bf78e29 AB |
9228 | public: |
9229 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
9230 | once the inferior function call has finished. */ | |
9231 | infcall_suspend_state (struct gdbarch *gdbarch, | |
dda83cd7 SM |
9232 | const struct thread_info *tp, |
9233 | struct regcache *regcache) | |
1edb66d8 | 9234 | : m_registers (new readonly_detached_regcache (*regcache)) |
6bf78e29 | 9235 | { |
1edb66d8 SM |
9236 | tp->save_suspend_to (m_thread_suspend); |
9237 | ||
6bf78e29 AB |
9238 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; |
9239 | ||
9240 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
9241 | { | |
dda83cd7 SM |
9242 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
9243 | size_t len = TYPE_LENGTH (type); | |
6bf78e29 | 9244 | |
dda83cd7 | 9245 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); |
6bf78e29 | 9246 | |
328d42d8 SM |
9247 | if (target_read (current_inferior ()->top_target (), |
9248 | TARGET_OBJECT_SIGNAL_INFO, NULL, | |
dda83cd7 SM |
9249 | siginfo_data.get (), 0, len) != len) |
9250 | { | |
9251 | /* Errors ignored. */ | |
9252 | siginfo_data.reset (nullptr); | |
9253 | } | |
6bf78e29 AB |
9254 | } |
9255 | ||
9256 | if (siginfo_data) | |
9257 | { | |
dda83cd7 SM |
9258 | m_siginfo_gdbarch = gdbarch; |
9259 | m_siginfo_data = std::move (siginfo_data); | |
6bf78e29 AB |
9260 | } |
9261 | } | |
9262 | ||
9263 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 9264 | |
6bf78e29 AB |
9265 | readonly_detached_regcache *registers () const |
9266 | { | |
9267 | return m_registers.get (); | |
9268 | } | |
9269 | ||
9270 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
9271 | ||
9272 | void restore (struct gdbarch *gdbarch, | |
dda83cd7 SM |
9273 | struct thread_info *tp, |
9274 | struct regcache *regcache) const | |
6bf78e29 | 9275 | { |
1edb66d8 | 9276 | tp->restore_suspend_from (m_thread_suspend); |
6bf78e29 AB |
9277 | |
9278 | if (m_siginfo_gdbarch == gdbarch) | |
9279 | { | |
dda83cd7 | 9280 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
6bf78e29 | 9281 | |
dda83cd7 | 9282 | /* Errors ignored. */ |
328d42d8 SM |
9283 | target_write (current_inferior ()->top_target (), |
9284 | TARGET_OBJECT_SIGNAL_INFO, NULL, | |
dda83cd7 | 9285 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); |
6bf78e29 AB |
9286 | } |
9287 | ||
9288 | /* The inferior can be gone if the user types "print exit(0)" | |
9289 | (and perhaps other times). */ | |
55f6301a | 9290 | if (target_has_execution ()) |
6bf78e29 AB |
9291 | /* NB: The register write goes through to the target. */ |
9292 | regcache->restore (registers ()); | |
9293 | } | |
9294 | ||
9295 | private: | |
9296 | /* How the current thread stopped before the inferior function call was | |
9297 | executed. */ | |
9298 | struct thread_suspend_state m_thread_suspend; | |
9299 | ||
9300 | /* The registers before the inferior function call was executed. */ | |
9301 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 9302 | |
35515841 | 9303 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 9304 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
9305 | |
9306 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
9307 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
9308 | content would be invalid. */ | |
6bf78e29 | 9309 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
9310 | }; |
9311 | ||
cb524840 TT |
9312 | infcall_suspend_state_up |
9313 | save_infcall_suspend_state () | |
b89667eb | 9314 | { |
b89667eb | 9315 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 9316 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9317 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 9318 | |
6bf78e29 AB |
9319 | infcall_suspend_state_up inf_state |
9320 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 9321 | |
6bf78e29 AB |
9322 | /* Having saved the current state, adjust the thread state, discarding |
9323 | any stop signal information. The stop signal is not useful when | |
9324 | starting an inferior function call, and run_inferior_call will not use | |
9325 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
1edb66d8 | 9326 | tp->set_stop_signal (GDB_SIGNAL_0); |
35515841 | 9327 | |
b89667eb DE |
9328 | return inf_state; |
9329 | } | |
9330 | ||
9331 | /* Restore inferior session state to INF_STATE. */ | |
9332 | ||
9333 | void | |
16c381f0 | 9334 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
9335 | { |
9336 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 9337 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9338 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 9339 | |
6bf78e29 | 9340 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 9341 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
9342 | } |
9343 | ||
b89667eb | 9344 | void |
16c381f0 | 9345 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 9346 | { |
dd848631 | 9347 | delete inf_state; |
b89667eb DE |
9348 | } |
9349 | ||
daf6667d | 9350 | readonly_detached_regcache * |
16c381f0 | 9351 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 9352 | { |
6bf78e29 | 9353 | return inf_state->registers (); |
b89667eb DE |
9354 | } |
9355 | ||
16c381f0 JK |
9356 | /* infcall_control_state contains state regarding gdb's control of the |
9357 | inferior itself like stepping control. It also contains session state like | |
9358 | the user's currently selected frame. */ | |
b89667eb | 9359 | |
16c381f0 | 9360 | struct infcall_control_state |
b89667eb | 9361 | { |
16c381f0 JK |
9362 | struct thread_control_state thread_control; |
9363 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
9364 | |
9365 | /* Other fields: */ | |
ee841dd8 TT |
9366 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
9367 | int stopped_by_random_signal = 0; | |
7a292a7a | 9368 | |
79952e69 PA |
9369 | /* ID and level of the selected frame when the inferior function |
9370 | call was made. */ | |
ee841dd8 | 9371 | struct frame_id selected_frame_id {}; |
79952e69 | 9372 | int selected_frame_level = -1; |
7a292a7a SS |
9373 | }; |
9374 | ||
c906108c | 9375 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9376 | connection. */ |
c906108c | 9377 | |
cb524840 TT |
9378 | infcall_control_state_up |
9379 | save_infcall_control_state () | |
c906108c | 9380 | { |
cb524840 | 9381 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9382 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9383 | struct inferior *inf = current_inferior (); |
7a292a7a | 9384 | |
16c381f0 JK |
9385 | inf_status->thread_control = tp->control; |
9386 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9387 | |
8358c15c | 9388 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9389 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9390 | |
16c381f0 JK |
9391 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9392 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9393 | hand them back the original chain when restore_infcall_control_state is | |
9394 | called. */ | |
9395 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9396 | |
9397 | /* Other fields: */ | |
9398 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9399 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9400 | |
79952e69 PA |
9401 | save_selected_frame (&inf_status->selected_frame_id, |
9402 | &inf_status->selected_frame_level); | |
b89667eb | 9403 | |
7a292a7a | 9404 | return inf_status; |
c906108c SS |
9405 | } |
9406 | ||
b89667eb DE |
9407 | /* Restore inferior session state to INF_STATUS. */ |
9408 | ||
c906108c | 9409 | void |
16c381f0 | 9410 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9411 | { |
4e1c45ea | 9412 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9413 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9414 | |
8358c15c JK |
9415 | if (tp->control.step_resume_breakpoint) |
9416 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9417 | ||
5b79abe7 TT |
9418 | if (tp->control.exception_resume_breakpoint) |
9419 | tp->control.exception_resume_breakpoint->disposition | |
9420 | = disp_del_at_next_stop; | |
9421 | ||
d82142e2 | 9422 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9423 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9424 | |
16c381f0 JK |
9425 | tp->control = inf_status->thread_control; |
9426 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9427 | |
9428 | /* Other fields: */ | |
9429 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9430 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9431 | |
841de120 | 9432 | if (target_has_stack ()) |
c906108c | 9433 | { |
79952e69 PA |
9434 | restore_selected_frame (inf_status->selected_frame_id, |
9435 | inf_status->selected_frame_level); | |
c906108c | 9436 | } |
c906108c | 9437 | |
ee841dd8 | 9438 | delete inf_status; |
7a292a7a | 9439 | } |
c906108c SS |
9440 | |
9441 | void | |
16c381f0 | 9442 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9443 | { |
8358c15c JK |
9444 | if (inf_status->thread_control.step_resume_breakpoint) |
9445 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9446 | = disp_del_at_next_stop; | |
9447 | ||
5b79abe7 TT |
9448 | if (inf_status->thread_control.exception_resume_breakpoint) |
9449 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9450 | = disp_del_at_next_stop; | |
9451 | ||
1777feb0 | 9452 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9453 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9454 | |
ee841dd8 | 9455 | delete inf_status; |
7a292a7a | 9456 | } |
b89667eb | 9457 | \f |
7f89fd65 | 9458 | /* See infrun.h. */ |
0c557179 SDJ |
9459 | |
9460 | void | |
9461 | clear_exit_convenience_vars (void) | |
9462 | { | |
9463 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9464 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9465 | } | |
c5aa993b | 9466 | \f |
488f131b | 9467 | |
b2175913 MS |
9468 | /* User interface for reverse debugging: |
9469 | Set exec-direction / show exec-direction commands | |
9470 | (returns error unless target implements to_set_exec_direction method). */ | |
9471 | ||
170742de | 9472 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9473 | static const char exec_forward[] = "forward"; |
9474 | static const char exec_reverse[] = "reverse"; | |
9475 | static const char *exec_direction = exec_forward; | |
40478521 | 9476 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9477 | exec_forward, |
9478 | exec_reverse, | |
9479 | NULL | |
9480 | }; | |
9481 | ||
9482 | static void | |
eb4c3f4a | 9483 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9484 | struct cmd_list_element *cmd) |
9485 | { | |
05374cfd | 9486 | if (target_can_execute_reverse ()) |
b2175913 MS |
9487 | { |
9488 | if (!strcmp (exec_direction, exec_forward)) | |
9489 | execution_direction = EXEC_FORWARD; | |
9490 | else if (!strcmp (exec_direction, exec_reverse)) | |
9491 | execution_direction = EXEC_REVERSE; | |
9492 | } | |
8bbed405 MS |
9493 | else |
9494 | { | |
9495 | exec_direction = exec_forward; | |
9496 | error (_("Target does not support this operation.")); | |
9497 | } | |
b2175913 MS |
9498 | } |
9499 | ||
9500 | static void | |
9501 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9502 | struct cmd_list_element *cmd, const char *value) | |
9503 | { | |
9504 | switch (execution_direction) { | |
9505 | case EXEC_FORWARD: | |
6cb06a8c | 9506 | gdb_printf (out, _("Forward.\n")); |
b2175913 MS |
9507 | break; |
9508 | case EXEC_REVERSE: | |
6cb06a8c | 9509 | gdb_printf (out, _("Reverse.\n")); |
b2175913 | 9510 | break; |
b2175913 | 9511 | default: |
d8b34453 PA |
9512 | internal_error (__FILE__, __LINE__, |
9513 | _("bogus execution_direction value: %d"), | |
9514 | (int) execution_direction); | |
b2175913 MS |
9515 | } |
9516 | } | |
9517 | ||
d4db2f36 PA |
9518 | static void |
9519 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9520 | struct cmd_list_element *c, const char *value) | |
9521 | { | |
6cb06a8c TT |
9522 | gdb_printf (file, _("Resuming the execution of threads " |
9523 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9524 | } |
ad52ddc6 | 9525 | |
22d2b532 SDJ |
9526 | /* Implementation of `siginfo' variable. */ |
9527 | ||
9528 | static const struct internalvar_funcs siginfo_funcs = | |
9529 | { | |
9530 | siginfo_make_value, | |
9531 | NULL, | |
22d2b532 SDJ |
9532 | }; |
9533 | ||
372316f1 PA |
9534 | /* Callback for infrun's target events source. This is marked when a |
9535 | thread has a pending status to process. */ | |
9536 | ||
9537 | static void | |
9538 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9539 | { | |
6b36ddeb | 9540 | clear_async_event_handler (infrun_async_inferior_event_token); |
b1a35af2 | 9541 | inferior_event_handler (INF_REG_EVENT); |
372316f1 PA |
9542 | } |
9543 | ||
8087c3fa | 9544 | #if GDB_SELF_TEST |
b161a60d SM |
9545 | namespace selftests |
9546 | { | |
9547 | ||
9548 | /* Verify that when two threads with the same ptid exist (from two different | |
9549 | targets) and one of them changes ptid, we only update inferior_ptid if | |
9550 | it is appropriate. */ | |
9551 | ||
9552 | static void | |
9553 | infrun_thread_ptid_changed () | |
9554 | { | |
9555 | gdbarch *arch = current_inferior ()->gdbarch; | |
9556 | ||
9557 | /* The thread which inferior_ptid represents changes ptid. */ | |
9558 | { | |
9559 | scoped_restore_current_pspace_and_thread restore; | |
9560 | ||
9561 | scoped_mock_context<test_target_ops> target1 (arch); | |
9562 | scoped_mock_context<test_target_ops> target2 (arch); | |
b161a60d SM |
9563 | |
9564 | ptid_t old_ptid (111, 222); | |
9565 | ptid_t new_ptid (111, 333); | |
9566 | ||
9567 | target1.mock_inferior.pid = old_ptid.pid (); | |
9568 | target1.mock_thread.ptid = old_ptid; | |
922cc93d SM |
9569 | target1.mock_inferior.ptid_thread_map.clear (); |
9570 | target1.mock_inferior.ptid_thread_map[old_ptid] = &target1.mock_thread; | |
9571 | ||
b161a60d SM |
9572 | target2.mock_inferior.pid = old_ptid.pid (); |
9573 | target2.mock_thread.ptid = old_ptid; | |
922cc93d SM |
9574 | target2.mock_inferior.ptid_thread_map.clear (); |
9575 | target2.mock_inferior.ptid_thread_map[old_ptid] = &target2.mock_thread; | |
b161a60d SM |
9576 | |
9577 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
9578 | set_current_inferior (&target1.mock_inferior); | |
9579 | ||
9580 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9581 | ||
9582 | gdb_assert (inferior_ptid == new_ptid); | |
9583 | } | |
9584 | ||
9585 | /* A thread with the same ptid as inferior_ptid, but from another target, | |
9586 | changes ptid. */ | |
9587 | { | |
9588 | scoped_restore_current_pspace_and_thread restore; | |
9589 | ||
9590 | scoped_mock_context<test_target_ops> target1 (arch); | |
9591 | scoped_mock_context<test_target_ops> target2 (arch); | |
b161a60d SM |
9592 | |
9593 | ptid_t old_ptid (111, 222); | |
9594 | ptid_t new_ptid (111, 333); | |
9595 | ||
9596 | target1.mock_inferior.pid = old_ptid.pid (); | |
9597 | target1.mock_thread.ptid = old_ptid; | |
922cc93d SM |
9598 | target1.mock_inferior.ptid_thread_map.clear (); |
9599 | target1.mock_inferior.ptid_thread_map[old_ptid] = &target1.mock_thread; | |
9600 | ||
b161a60d SM |
9601 | target2.mock_inferior.pid = old_ptid.pid (); |
9602 | target2.mock_thread.ptid = old_ptid; | |
922cc93d SM |
9603 | target2.mock_inferior.ptid_thread_map.clear (); |
9604 | target2.mock_inferior.ptid_thread_map[old_ptid] = &target2.mock_thread; | |
b161a60d SM |
9605 | |
9606 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
9607 | set_current_inferior (&target2.mock_inferior); | |
9608 | ||
9609 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9610 | ||
9611 | gdb_assert (inferior_ptid == old_ptid); | |
9612 | } | |
9613 | } | |
9614 | ||
9615 | } /* namespace selftests */ | |
9616 | ||
8087c3fa JB |
9617 | #endif /* GDB_SELF_TEST */ |
9618 | ||
6c265988 | 9619 | void _initialize_infrun (); |
c906108c | 9620 | void |
6c265988 | 9621 | _initialize_infrun () |
c906108c | 9622 | { |
de0bea00 | 9623 | struct cmd_list_element *c; |
c906108c | 9624 | |
372316f1 PA |
9625 | /* Register extra event sources in the event loop. */ |
9626 | infrun_async_inferior_event_token | |
db20ebdf SM |
9627 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL, |
9628 | "infrun"); | |
372316f1 | 9629 | |
e0f25bd9 SM |
9630 | cmd_list_element *info_signals_cmd |
9631 | = add_info ("signals", info_signals_command, _("\ | |
1bedd215 AC |
9632 | What debugger does when program gets various signals.\n\ |
9633 | Specify a signal as argument to print info on that signal only.")); | |
e0f25bd9 | 9634 | add_info_alias ("handle", info_signals_cmd, 0); |
c906108c | 9635 | |
de0bea00 | 9636 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9637 | Specify how to handle signals.\n\ |
486c7739 | 9638 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9639 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9640 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9641 | will be displayed instead.\n\ |
9642 | \n\ | |
c906108c SS |
9643 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9644 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9645 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9646 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9647 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9648 | \n\ |
1bedd215 | 9649 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9650 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9651 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9652 | Print means print a message if this signal happens.\n\ | |
9653 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9654 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9655 | Pass and Stop may be combined.\n\ |
9656 | \n\ | |
9657 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9658 | may be interspersed with actions, with the actions being performed for\n\ | |
9659 | all signals cumulatively specified.")); | |
de0bea00 | 9660 | set_cmd_completer (c, handle_completer); |
486c7739 | 9661 | |
49a82d50 TT |
9662 | stop_command = add_cmd ("stop", class_obscure, |
9663 | not_just_help_class_command, _("\ | |
1a966eab | 9664 | There is no `stop' command, but you can set a hook on `stop'.\n\ |
c906108c | 9665 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9666 | of the program stops."), &cmdlist); |
c906108c | 9667 | |
94ba44a6 SM |
9668 | add_setshow_boolean_cmd |
9669 | ("infrun", class_maintenance, &debug_infrun, | |
9670 | _("Set inferior debugging."), | |
9671 | _("Show inferior debugging."), | |
9672 | _("When non-zero, inferior specific debugging is enabled."), | |
9673 | NULL, show_debug_infrun, &setdebuglist, &showdebuglist); | |
527159b7 | 9674 | |
ad52ddc6 PA |
9675 | add_setshow_boolean_cmd ("non-stop", no_class, |
9676 | &non_stop_1, _("\ | |
9677 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9678 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9679 | When debugging a multi-threaded program and this setting is\n\ | |
9680 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9681 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9682 | all other threads in the program while you interact with the thread of\n\ | |
9683 | interest. When you continue or step a thread, you can allow the other\n\ | |
9684 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9685 | thread's state, all threads stop.\n\ | |
9686 | \n\ | |
9687 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9688 | to run freely. You'll be able to step each thread independently,\n\ | |
9689 | leave it stopped or free to run as needed."), | |
9690 | set_non_stop, | |
9691 | show_non_stop, | |
9692 | &setlist, | |
9693 | &showlist); | |
9694 | ||
adc6a863 | 9695 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9696 | { |
9697 | signal_stop[i] = 1; | |
9698 | signal_print[i] = 1; | |
9699 | signal_program[i] = 1; | |
ab04a2af | 9700 | signal_catch[i] = 0; |
c906108c SS |
9701 | } |
9702 | ||
4d9d9d04 PA |
9703 | /* Signals caused by debugger's own actions should not be given to |
9704 | the program afterwards. | |
9705 | ||
9706 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9707 | explicitly specifies that it should be delivered to the target | |
9708 | program. Typically, that would occur when a user is debugging a | |
9709 | target monitor on a simulator: the target monitor sets a | |
9710 | breakpoint; the simulator encounters this breakpoint and halts | |
9711 | the simulation handing control to GDB; GDB, noting that the stop | |
9712 | address doesn't map to any known breakpoint, returns control back | |
9713 | to the simulator; the simulator then delivers the hardware | |
9714 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9715 | debugged. */ | |
a493e3e2 PA |
9716 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9717 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9718 | |
9719 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9720 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9721 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9722 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9723 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9724 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9725 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9726 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9727 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9728 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9729 | signal_print[GDB_SIGNAL_IO] = 0; | |
9730 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9731 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9732 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9733 | signal_print[GDB_SIGNAL_URG] = 0; | |
9734 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9735 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9736 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9737 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9738 | |
cd0fc7c3 SS |
9739 | /* These signals are used internally by user-level thread |
9740 | implementations. (See signal(5) on Solaris.) Like the above | |
9741 | signals, a healthy program receives and handles them as part of | |
9742 | its normal operation. */ | |
a493e3e2 PA |
9743 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9744 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9745 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9746 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9747 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9748 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9749 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9750 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9751 | |
2455069d UW |
9752 | /* Update cached state. */ |
9753 | signal_cache_update (-1); | |
9754 | ||
85c07804 AC |
9755 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9756 | &stop_on_solib_events, _("\ | |
9757 | Set stopping for shared library events."), _("\ | |
9758 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9759 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9760 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9761 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9762 | set_stop_on_solib_events, |
920d2a44 | 9763 | show_stop_on_solib_events, |
85c07804 | 9764 | &setlist, &showlist); |
c906108c | 9765 | |
7ab04401 AC |
9766 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9767 | follow_fork_mode_kind_names, | |
9768 | &follow_fork_mode_string, _("\ | |
9769 | Set debugger response to a program call of fork or vfork."), _("\ | |
9770 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9771 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9772 | parent - the original process is debugged after a fork\n\ | |
9773 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9774 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9775 | By default, the debugger will follow the parent process."), |
9776 | NULL, | |
920d2a44 | 9777 | show_follow_fork_mode_string, |
7ab04401 AC |
9778 | &setlist, &showlist); |
9779 | ||
6c95b8df PA |
9780 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9781 | follow_exec_mode_names, | |
9782 | &follow_exec_mode_string, _("\ | |
9783 | Set debugger response to a program call of exec."), _("\ | |
9784 | Show debugger response to a program call of exec."), _("\ | |
9785 | An exec call replaces the program image of a process.\n\ | |
9786 | \n\ | |
9787 | follow-exec-mode can be:\n\ | |
9788 | \n\ | |
cce7e648 | 9789 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9790 | to this new inferior. The program the process was running before\n\ |
9791 | the exec call can be restarted afterwards by restarting the original\n\ | |
9792 | inferior.\n\ | |
9793 | \n\ | |
9794 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9795 | The new executable image replaces the previous executable loaded in\n\ | |
9796 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9797 | the executable the process was running after the exec call.\n\ | |
9798 | \n\ | |
9799 | By default, the debugger will use the same inferior."), | |
9800 | NULL, | |
9801 | show_follow_exec_mode_string, | |
9802 | &setlist, &showlist); | |
9803 | ||
7ab04401 AC |
9804 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9805 | scheduler_enums, &scheduler_mode, _("\ | |
9806 | Set mode for locking scheduler during execution."), _("\ | |
9807 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9808 | off == no locking (threads may preempt at any time)\n\ |
9809 | on == full locking (no thread except the current thread may run)\n\ | |
dda83cd7 | 9810 | This applies to both normal execution and replay mode.\n\ |
f2665db5 | 9811 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ |
dda83cd7 SM |
9812 | In this mode, other threads may run during other commands.\n\ |
9813 | This applies to both normal execution and replay mode.\n\ | |
f2665db5 | 9814 | replay == scheduler locked in replay mode and unlocked during normal execution."), |
7ab04401 | 9815 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9816 | show_scheduler_mode, |
7ab04401 | 9817 | &setlist, &showlist); |
5fbbeb29 | 9818 | |
d4db2f36 PA |
9819 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9820 | Set mode for resuming threads of all processes."), _("\ | |
9821 | Show mode for resuming threads of all processes."), _("\ | |
9822 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9823 | threads of all processes. When off (which is the default), execution\n\ | |
9824 | commands only resume the threads of the current process. The set of\n\ | |
9825 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9826 | mode (see help set scheduler-locking)."), | |
9827 | NULL, | |
9828 | show_schedule_multiple, | |
9829 | &setlist, &showlist); | |
9830 | ||
5bf193a2 AC |
9831 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9832 | Set mode of the step operation."), _("\ | |
9833 | Show mode of the step operation."), _("\ | |
9834 | When set, doing a step over a function without debug line information\n\ | |
9835 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9836 | function is skipped and the step command stops at a different source line."), | |
9837 | NULL, | |
920d2a44 | 9838 | show_step_stop_if_no_debug, |
5bf193a2 | 9839 | &setlist, &showlist); |
ca6724c1 | 9840 | |
72d0e2c5 YQ |
9841 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9842 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9843 | Set debugger's willingness to use displaced stepping."), _("\ |
9844 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9845 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9846 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9847 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9848 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9849 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9850 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9851 | NULL, |
9852 | show_can_use_displaced_stepping, | |
9853 | &setlist, &showlist); | |
237fc4c9 | 9854 | |
b2175913 MS |
9855 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9856 | &exec_direction, _("Set direction of execution.\n\ | |
9857 | Options are 'forward' or 'reverse'."), | |
9858 | _("Show direction of execution (forward/reverse)."), | |
9859 | _("Tells gdb whether to execute forward or backward."), | |
9860 | set_exec_direction_func, show_exec_direction_func, | |
9861 | &setlist, &showlist); | |
9862 | ||
6c95b8df PA |
9863 | /* Set/show detach-on-fork: user-settable mode. */ |
9864 | ||
9865 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9866 | Set whether gdb will detach the child of a fork."), _("\ | |
9867 | Show whether gdb will detach the child of a fork."), _("\ | |
9868 | Tells gdb whether to detach the child of a fork."), | |
9869 | NULL, NULL, &setlist, &showlist); | |
9870 | ||
03583c20 UW |
9871 | /* Set/show disable address space randomization mode. */ |
9872 | ||
9873 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9874 | &disable_randomization, _("\ | |
9875 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9876 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9877 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9878 | address space is disabled. Standalone programs run with the randomization\n\ | |
9879 | enabled by default on some platforms."), | |
9880 | &set_disable_randomization, | |
9881 | &show_disable_randomization, | |
9882 | &setlist, &showlist); | |
9883 | ||
ca6724c1 | 9884 | /* ptid initializations */ |
ca6724c1 KB |
9885 | inferior_ptid = null_ptid; |
9886 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9887 | |
c90e7d63 SM |
9888 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed, |
9889 | "infrun"); | |
9890 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested, | |
9891 | "infrun"); | |
9892 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit, "infrun"); | |
9893 | gdb::observers::inferior_exit.attach (infrun_inferior_exit, "infrun"); | |
9894 | gdb::observers::inferior_execd.attach (infrun_inferior_execd, "infrun"); | |
4aa995e1 PA |
9895 | |
9896 | /* Explicitly create without lookup, since that tries to create a | |
9897 | value with a void typed value, and when we get here, gdbarch | |
9898 | isn't initialized yet. At this point, we're quite sure there | |
9899 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9900 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9901 | |
9902 | add_setshow_boolean_cmd ("observer", no_class, | |
9903 | &observer_mode_1, _("\ | |
9904 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9905 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9906 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9907 | affect its execution. Registers and memory may not be changed,\n\ | |
9908 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9909 | or signalled."), | |
9910 | set_observer_mode, | |
9911 | show_observer_mode, | |
9912 | &setlist, | |
9913 | &showlist); | |
b161a60d SM |
9914 | |
9915 | #if GDB_SELF_TEST | |
9916 | selftests::register_test ("infrun_thread_ptid_changed", | |
9917 | selftests::infrun_thread_ptid_changed); | |
9918 | #endif | |
c906108c | 9919 | } |