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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 | |
3666a048 | 4 | Copyright (C) 1986-2021 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" |
c906108c SS |
75 | |
76 | /* Prototypes for local functions */ | |
77 | ||
2ea28649 | 78 | static void sig_print_info (enum gdb_signal); |
c906108c | 79 | |
96baa820 | 80 | static void sig_print_header (void); |
c906108c | 81 | |
d83ad864 DB |
82 | static void follow_inferior_reset_breakpoints (void); |
83 | ||
c4464ade | 84 | static bool currently_stepping (struct thread_info *tp); |
a289b8f6 | 85 | |
2c03e5be | 86 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
87 | |
88 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
89 | ||
2484c66b UW |
90 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
91 | ||
22b11ba9 | 92 | static bool maybe_software_singlestep (struct gdbarch *gdbarch); |
8550d3b3 | 93 | |
aff4e175 AB |
94 | static void resume (gdb_signal sig); |
95 | ||
5b6d1e4f PA |
96 | static void wait_for_inferior (inferior *inf); |
97 | ||
372316f1 PA |
98 | /* Asynchronous signal handler registered as event loop source for |
99 | when we have pending events ready to be passed to the core. */ | |
100 | static struct async_event_handler *infrun_async_inferior_event_token; | |
101 | ||
102 | /* Stores whether infrun_async was previously enabled or disabled. | |
103 | Starts off as -1, indicating "never enabled/disabled". */ | |
104 | static int infrun_is_async = -1; | |
105 | ||
106 | /* See infrun.h. */ | |
107 | ||
108 | void | |
109 | infrun_async (int enable) | |
110 | { | |
111 | if (infrun_is_async != enable) | |
112 | { | |
113 | infrun_is_async = enable; | |
114 | ||
1eb8556f | 115 | infrun_debug_printf ("enable=%d", enable); |
372316f1 PA |
116 | |
117 | if (enable) | |
118 | mark_async_event_handler (infrun_async_inferior_event_token); | |
119 | else | |
120 | clear_async_event_handler (infrun_async_inferior_event_token); | |
121 | } | |
122 | } | |
123 | ||
0b333c5e PA |
124 | /* See infrun.h. */ |
125 | ||
126 | void | |
127 | mark_infrun_async_event_handler (void) | |
128 | { | |
129 | mark_async_event_handler (infrun_async_inferior_event_token); | |
130 | } | |
131 | ||
5fbbeb29 CF |
132 | /* When set, stop the 'step' command if we enter a function which has |
133 | no line number information. The normal behavior is that we step | |
134 | over such function. */ | |
491144b5 | 135 | bool step_stop_if_no_debug = false; |
920d2a44 AC |
136 | static void |
137 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
138 | struct cmd_list_element *c, const char *value) | |
139 | { | |
140 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
141 | } | |
5fbbeb29 | 142 | |
b9f437de PA |
143 | /* proceed and normal_stop use this to notify the user when the |
144 | inferior stopped in a different thread than it had been running | |
145 | in. */ | |
96baa820 | 146 | |
39f77062 | 147 | static ptid_t previous_inferior_ptid; |
7a292a7a | 148 | |
07107ca6 LM |
149 | /* If set (default for legacy reasons), when following a fork, GDB |
150 | will detach from one of the fork branches, child or parent. | |
151 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
152 | setting. */ | |
153 | ||
491144b5 | 154 | static bool detach_fork = true; |
6c95b8df | 155 | |
94ba44a6 | 156 | bool debug_infrun = false; |
920d2a44 AC |
157 | static void |
158 | show_debug_infrun (struct ui_file *file, int from_tty, | |
159 | struct cmd_list_element *c, const char *value) | |
160 | { | |
161 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
162 | } | |
527159b7 | 163 | |
03583c20 UW |
164 | /* Support for disabling address space randomization. */ |
165 | ||
491144b5 | 166 | bool disable_randomization = true; |
03583c20 UW |
167 | |
168 | static void | |
169 | show_disable_randomization (struct ui_file *file, int from_tty, | |
170 | struct cmd_list_element *c, const char *value) | |
171 | { | |
172 | if (target_supports_disable_randomization ()) | |
173 | fprintf_filtered (file, | |
174 | _("Disabling randomization of debuggee's " | |
175 | "virtual address space is %s.\n"), | |
176 | value); | |
177 | else | |
178 | fputs_filtered (_("Disabling randomization of debuggee's " | |
179 | "virtual address space is unsupported on\n" | |
180 | "this platform.\n"), file); | |
181 | } | |
182 | ||
183 | static void | |
eb4c3f4a | 184 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
185 | struct cmd_list_element *c) |
186 | { | |
187 | if (!target_supports_disable_randomization ()) | |
188 | error (_("Disabling randomization of debuggee's " | |
189 | "virtual address space is unsupported on\n" | |
190 | "this platform.")); | |
191 | } | |
192 | ||
d32dc48e PA |
193 | /* User interface for non-stop mode. */ |
194 | ||
491144b5 CB |
195 | bool non_stop = false; |
196 | static bool non_stop_1 = false; | |
d32dc48e PA |
197 | |
198 | static void | |
eb4c3f4a | 199 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
200 | struct cmd_list_element *c) |
201 | { | |
55f6301a | 202 | if (target_has_execution ()) |
d32dc48e PA |
203 | { |
204 | non_stop_1 = non_stop; | |
205 | error (_("Cannot change this setting while the inferior is running.")); | |
206 | } | |
207 | ||
208 | non_stop = non_stop_1; | |
209 | } | |
210 | ||
211 | static void | |
212 | show_non_stop (struct ui_file *file, int from_tty, | |
213 | struct cmd_list_element *c, const char *value) | |
214 | { | |
215 | fprintf_filtered (file, | |
216 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
217 | value); | |
218 | } | |
219 | ||
d914c394 SS |
220 | /* "Observer mode" is somewhat like a more extreme version of |
221 | non-stop, in which all GDB operations that might affect the | |
222 | target's execution have been disabled. */ | |
223 | ||
6bd434d6 | 224 | static bool observer_mode = false; |
491144b5 | 225 | static bool observer_mode_1 = false; |
d914c394 SS |
226 | |
227 | static void | |
eb4c3f4a | 228 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
229 | struct cmd_list_element *c) |
230 | { | |
55f6301a | 231 | if (target_has_execution ()) |
d914c394 SS |
232 | { |
233 | observer_mode_1 = observer_mode; | |
234 | error (_("Cannot change this setting while the inferior is running.")); | |
235 | } | |
236 | ||
237 | observer_mode = observer_mode_1; | |
238 | ||
239 | may_write_registers = !observer_mode; | |
240 | may_write_memory = !observer_mode; | |
241 | may_insert_breakpoints = !observer_mode; | |
242 | may_insert_tracepoints = !observer_mode; | |
243 | /* We can insert fast tracepoints in or out of observer mode, | |
244 | but enable them if we're going into this mode. */ | |
245 | if (observer_mode) | |
491144b5 | 246 | may_insert_fast_tracepoints = true; |
d914c394 SS |
247 | may_stop = !observer_mode; |
248 | update_target_permissions (); | |
249 | ||
250 | /* Going *into* observer mode we must force non-stop, then | |
251 | going out we leave it that way. */ | |
252 | if (observer_mode) | |
253 | { | |
d914c394 | 254 | pagination_enabled = 0; |
491144b5 | 255 | non_stop = non_stop_1 = true; |
d914c394 SS |
256 | } |
257 | ||
258 | if (from_tty) | |
259 | printf_filtered (_("Observer mode is now %s.\n"), | |
260 | (observer_mode ? "on" : "off")); | |
261 | } | |
262 | ||
263 | static void | |
264 | show_observer_mode (struct ui_file *file, int from_tty, | |
265 | struct cmd_list_element *c, const char *value) | |
266 | { | |
267 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
268 | } | |
269 | ||
270 | /* This updates the value of observer mode based on changes in | |
271 | permissions. Note that we are deliberately ignoring the values of | |
272 | may-write-registers and may-write-memory, since the user may have | |
273 | reason to enable these during a session, for instance to turn on a | |
274 | debugging-related global. */ | |
275 | ||
276 | void | |
277 | update_observer_mode (void) | |
278 | { | |
491144b5 CB |
279 | bool newval = (!may_insert_breakpoints |
280 | && !may_insert_tracepoints | |
281 | && may_insert_fast_tracepoints | |
282 | && !may_stop | |
283 | && non_stop); | |
d914c394 SS |
284 | |
285 | /* Let the user know if things change. */ | |
286 | if (newval != observer_mode) | |
287 | printf_filtered (_("Observer mode is now %s.\n"), | |
288 | (newval ? "on" : "off")); | |
289 | ||
290 | observer_mode = observer_mode_1 = newval; | |
291 | } | |
c2c6d25f | 292 | |
c906108c SS |
293 | /* Tables of how to react to signals; the user sets them. */ |
294 | ||
adc6a863 PA |
295 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
296 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
297 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 298 | |
ab04a2af TT |
299 | /* Table of signals that are registered with "catch signal". A |
300 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
301 | signal" command. */ |
302 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 303 | |
2455069d UW |
304 | /* Table of signals that the target may silently handle. |
305 | This is automatically determined from the flags above, | |
306 | and simply cached here. */ | |
adc6a863 | 307 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 308 | |
c906108c SS |
309 | #define SET_SIGS(nsigs,sigs,flags) \ |
310 | do { \ | |
311 | int signum = (nsigs); \ | |
312 | while (signum-- > 0) \ | |
313 | if ((sigs)[signum]) \ | |
314 | (flags)[signum] = 1; \ | |
315 | } while (0) | |
316 | ||
317 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
318 | do { \ | |
319 | int signum = (nsigs); \ | |
320 | while (signum-- > 0) \ | |
321 | if ((sigs)[signum]) \ | |
322 | (flags)[signum] = 0; \ | |
323 | } while (0) | |
324 | ||
9b224c5e PA |
325 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
326 | this function is to avoid exporting `signal_program'. */ | |
327 | ||
328 | void | |
329 | update_signals_program_target (void) | |
330 | { | |
adc6a863 | 331 | target_program_signals (signal_program); |
9b224c5e PA |
332 | } |
333 | ||
1777feb0 | 334 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 335 | |
edb3359d | 336 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
337 | |
338 | /* Command list pointer for the "stop" placeholder. */ | |
339 | ||
340 | static struct cmd_list_element *stop_command; | |
341 | ||
c906108c SS |
342 | /* Nonzero if we want to give control to the user when we're notified |
343 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 344 | int stop_on_solib_events; |
f9e14852 GB |
345 | |
346 | /* Enable or disable optional shared library event breakpoints | |
347 | as appropriate when the above flag is changed. */ | |
348 | ||
349 | static void | |
eb4c3f4a TT |
350 | set_stop_on_solib_events (const char *args, |
351 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
352 | { |
353 | update_solib_breakpoints (); | |
354 | } | |
355 | ||
920d2a44 AC |
356 | static void |
357 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
358 | struct cmd_list_element *c, const char *value) | |
359 | { | |
360 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
361 | value); | |
362 | } | |
c906108c | 363 | |
c4464ade | 364 | /* True after stop if current stack frame should be printed. */ |
c906108c | 365 | |
c4464ade | 366 | static bool stop_print_frame; |
c906108c | 367 | |
5b6d1e4f PA |
368 | /* This is a cached copy of the target/ptid/waitstatus of the last |
369 | event returned by target_wait()/deprecated_target_wait_hook(). | |
370 | This information is returned by get_last_target_status(). */ | |
371 | static process_stratum_target *target_last_proc_target; | |
39f77062 | 372 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
373 | static struct target_waitstatus target_last_waitstatus; |
374 | ||
4e1c45ea | 375 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 376 | |
53904c9e AC |
377 | static const char follow_fork_mode_child[] = "child"; |
378 | static const char follow_fork_mode_parent[] = "parent"; | |
379 | ||
40478521 | 380 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
381 | follow_fork_mode_child, |
382 | follow_fork_mode_parent, | |
383 | NULL | |
ef346e04 | 384 | }; |
c906108c | 385 | |
53904c9e | 386 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
387 | static void |
388 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
389 | struct cmd_list_element *c, const char *value) | |
390 | { | |
3e43a32a MS |
391 | fprintf_filtered (file, |
392 | _("Debugger response to a program " | |
393 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
394 | value); |
395 | } | |
c906108c SS |
396 | \f |
397 | ||
d83ad864 DB |
398 | /* Handle changes to the inferior list based on the type of fork, |
399 | which process is being followed, and whether the other process | |
400 | should be detached. On entry inferior_ptid must be the ptid of | |
401 | the fork parent. At return inferior_ptid is the ptid of the | |
402 | followed inferior. */ | |
403 | ||
5ab2fbf1 SM |
404 | static bool |
405 | follow_fork_inferior (bool follow_child, bool detach_fork) | |
d83ad864 DB |
406 | { |
407 | int has_vforked; | |
79639e11 | 408 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
409 | |
410 | has_vforked = (inferior_thread ()->pending_follow.kind | |
411 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
412 | parent_ptid = inferior_ptid; |
413 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
414 | |
415 | if (has_vforked | |
416 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 417 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
418 | && !(follow_child || detach_fork || sched_multi)) |
419 | { | |
420 | /* The parent stays blocked inside the vfork syscall until the | |
421 | child execs or exits. If we don't let the child run, then | |
422 | the parent stays blocked. If we're telling the parent to run | |
423 | in the foreground, the user will not be able to ctrl-c to get | |
424 | back the terminal, effectively hanging the debug session. */ | |
425 | fprintf_filtered (gdb_stderr, _("\ | |
426 | Can not resume the parent process over vfork in the foreground while\n\ | |
427 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
428 | \"set schedule-multiple\".\n")); | |
e97007b6 | 429 | return true; |
d83ad864 DB |
430 | } |
431 | ||
ff770835 SM |
432 | thread_info *child_thr = nullptr; |
433 | ||
d83ad864 DB |
434 | if (!follow_child) |
435 | { | |
436 | /* Detach new forked process? */ | |
437 | if (detach_fork) | |
438 | { | |
d83ad864 DB |
439 | /* Before detaching from the child, remove all breakpoints |
440 | from it. If we forked, then this has already been taken | |
441 | care of by infrun.c. If we vforked however, any | |
442 | breakpoint inserted in the parent is visible in the | |
443 | child, even those added while stopped in a vfork | |
444 | catchpoint. This will remove the breakpoints from the | |
445 | parent also, but they'll be reinserted below. */ | |
446 | if (has_vforked) | |
447 | { | |
448 | /* Keep breakpoints list in sync. */ | |
00431a78 | 449 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
450 | } |
451 | ||
f67c0c91 | 452 | if (print_inferior_events) |
d83ad864 | 453 | { |
8dd06f7a | 454 | /* Ensure that we have a process ptid. */ |
e99b03dc | 455 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 456 | |
223ffa71 | 457 | target_terminal::ours_for_output (); |
d83ad864 | 458 | fprintf_filtered (gdb_stdlog, |
f67c0c91 | 459 | _("[Detaching after %s from child %s]\n"), |
6f259a23 | 460 | has_vforked ? "vfork" : "fork", |
a068643d | 461 | target_pid_to_str (process_ptid).c_str ()); |
d83ad864 DB |
462 | } |
463 | } | |
464 | else | |
465 | { | |
466 | struct inferior *parent_inf, *child_inf; | |
d83ad864 DB |
467 | |
468 | /* Add process to GDB's tables. */ | |
e99b03dc | 469 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
470 | |
471 | parent_inf = current_inferior (); | |
472 | child_inf->attach_flag = parent_inf->attach_flag; | |
473 | copy_terminal_info (child_inf, parent_inf); | |
474 | child_inf->gdbarch = parent_inf->gdbarch; | |
475 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
476 | ||
5ed8105e | 477 | scoped_restore_current_pspace_and_thread restore_pspace_thread; |
d83ad864 | 478 | |
2a00d7ce | 479 | set_current_inferior (child_inf); |
5b6d1e4f | 480 | switch_to_no_thread (); |
d83ad864 | 481 | child_inf->symfile_flags = SYMFILE_NO_READ; |
02980c56 | 482 | child_inf->push_target (parent_inf->process_target ()); |
ff770835 SM |
483 | child_thr = add_thread_silent (child_inf->process_target (), |
484 | child_ptid); | |
d83ad864 DB |
485 | |
486 | /* If this is a vfork child, then the address-space is | |
487 | shared with the parent. */ | |
488 | if (has_vforked) | |
489 | { | |
490 | child_inf->pspace = parent_inf->pspace; | |
491 | child_inf->aspace = parent_inf->aspace; | |
492 | ||
5b6d1e4f PA |
493 | exec_on_vfork (); |
494 | ||
d83ad864 DB |
495 | /* The parent will be frozen until the child is done |
496 | with the shared region. Keep track of the | |
497 | parent. */ | |
498 | child_inf->vfork_parent = parent_inf; | |
499 | child_inf->pending_detach = 0; | |
500 | parent_inf->vfork_child = child_inf; | |
501 | parent_inf->pending_detach = 0; | |
18493a00 PA |
502 | |
503 | /* Now that the inferiors and program spaces are all | |
504 | wired up, we can switch to the child thread (which | |
505 | switches inferior and program space too). */ | |
506 | switch_to_thread (child_thr); | |
d83ad864 DB |
507 | } |
508 | else | |
509 | { | |
510 | child_inf->aspace = new_address_space (); | |
564b1e3f | 511 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
512 | child_inf->removable = 1; |
513 | set_current_program_space (child_inf->pspace); | |
514 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
515 | ||
18493a00 PA |
516 | /* solib_create_inferior_hook relies on the current |
517 | thread. */ | |
518 | switch_to_thread (child_thr); | |
d83ad864 | 519 | } |
d83ad864 DB |
520 | } |
521 | ||
522 | if (has_vforked) | |
523 | { | |
524 | struct inferior *parent_inf; | |
525 | ||
526 | parent_inf = current_inferior (); | |
527 | ||
528 | /* If we detached from the child, then we have to be careful | |
529 | to not insert breakpoints in the parent until the child | |
530 | is done with the shared memory region. However, if we're | |
531 | staying attached to the child, then we can and should | |
532 | insert breakpoints, so that we can debug it. A | |
533 | subsequent child exec or exit is enough to know when does | |
534 | the child stops using the parent's address space. */ | |
535 | parent_inf->waiting_for_vfork_done = detach_fork; | |
536 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
537 | } | |
538 | } | |
539 | else | |
540 | { | |
541 | /* Follow the child. */ | |
542 | struct inferior *parent_inf, *child_inf; | |
543 | struct program_space *parent_pspace; | |
544 | ||
f67c0c91 | 545 | if (print_inferior_events) |
d83ad864 | 546 | { |
f67c0c91 SDJ |
547 | std::string parent_pid = target_pid_to_str (parent_ptid); |
548 | std::string child_pid = target_pid_to_str (child_ptid); | |
549 | ||
223ffa71 | 550 | target_terminal::ours_for_output (); |
6f259a23 | 551 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
552 | _("[Attaching after %s %s to child %s]\n"), |
553 | parent_pid.c_str (), | |
6f259a23 | 554 | has_vforked ? "vfork" : "fork", |
f67c0c91 | 555 | child_pid.c_str ()); |
d83ad864 DB |
556 | } |
557 | ||
558 | /* Add the new inferior first, so that the target_detach below | |
559 | doesn't unpush the target. */ | |
560 | ||
e99b03dc | 561 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
562 | |
563 | parent_inf = current_inferior (); | |
564 | child_inf->attach_flag = parent_inf->attach_flag; | |
565 | copy_terminal_info (child_inf, parent_inf); | |
566 | child_inf->gdbarch = parent_inf->gdbarch; | |
567 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
568 | ||
569 | parent_pspace = parent_inf->pspace; | |
570 | ||
5b6d1e4f | 571 | process_stratum_target *target = parent_inf->process_target (); |
d83ad864 | 572 | |
5b6d1e4f PA |
573 | { |
574 | /* Hold a strong reference to the target while (maybe) | |
575 | detaching the parent. Otherwise detaching could close the | |
576 | target. */ | |
577 | auto target_ref = target_ops_ref::new_reference (target); | |
578 | ||
579 | /* If we're vforking, we want to hold on to the parent until | |
580 | the child exits or execs. At child exec or exit time we | |
581 | can remove the old breakpoints from the parent and detach | |
582 | or resume debugging it. Otherwise, detach the parent now; | |
583 | we'll want to reuse it's program/address spaces, but we | |
584 | can't set them to the child before removing breakpoints | |
585 | from the parent, otherwise, the breakpoints module could | |
586 | decide to remove breakpoints from the wrong process (since | |
587 | they'd be assigned to the same address space). */ | |
588 | ||
589 | if (has_vforked) | |
590 | { | |
591 | gdb_assert (child_inf->vfork_parent == NULL); | |
592 | gdb_assert (parent_inf->vfork_child == NULL); | |
593 | child_inf->vfork_parent = parent_inf; | |
594 | child_inf->pending_detach = 0; | |
595 | parent_inf->vfork_child = child_inf; | |
596 | parent_inf->pending_detach = detach_fork; | |
597 | parent_inf->waiting_for_vfork_done = 0; | |
598 | } | |
599 | else if (detach_fork) | |
600 | { | |
601 | if (print_inferior_events) | |
602 | { | |
603 | /* Ensure that we have a process ptid. */ | |
604 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
605 | ||
606 | target_terminal::ours_for_output (); | |
607 | fprintf_filtered (gdb_stdlog, | |
608 | _("[Detaching after fork from " | |
609 | "parent %s]\n"), | |
610 | target_pid_to_str (process_ptid).c_str ()); | |
611 | } | |
8dd06f7a | 612 | |
5b6d1e4f PA |
613 | target_detach (parent_inf, 0); |
614 | parent_inf = NULL; | |
615 | } | |
6f259a23 | 616 | |
5b6d1e4f | 617 | /* Note that the detach above makes PARENT_INF dangling. */ |
d83ad864 | 618 | |
5b6d1e4f PA |
619 | /* Add the child thread to the appropriate lists, and switch |
620 | to this new thread, before cloning the program space, and | |
621 | informing the solib layer about this new process. */ | |
d83ad864 | 622 | |
5b6d1e4f | 623 | set_current_inferior (child_inf); |
02980c56 | 624 | child_inf->push_target (target); |
5b6d1e4f | 625 | } |
d83ad864 | 626 | |
ff770835 | 627 | child_thr = add_thread_silent (target, child_ptid); |
d83ad864 DB |
628 | |
629 | /* If this is a vfork child, then the address-space is shared | |
630 | with the parent. If we detached from the parent, then we can | |
631 | reuse the parent's program/address spaces. */ | |
632 | if (has_vforked || detach_fork) | |
633 | { | |
634 | child_inf->pspace = parent_pspace; | |
635 | child_inf->aspace = child_inf->pspace->aspace; | |
5b6d1e4f PA |
636 | |
637 | exec_on_vfork (); | |
d83ad864 DB |
638 | } |
639 | else | |
640 | { | |
641 | child_inf->aspace = new_address_space (); | |
564b1e3f | 642 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
643 | child_inf->removable = 1; |
644 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
645 | set_current_program_space (child_inf->pspace); | |
646 | clone_program_space (child_inf->pspace, parent_pspace); | |
d83ad864 | 647 | } |
18493a00 PA |
648 | |
649 | switch_to_thread (child_thr); | |
d83ad864 DB |
650 | } |
651 | ||
e97007b6 SM |
652 | target_follow_fork (follow_child, detach_fork); |
653 | ||
ff770835 SM |
654 | /* If we ended up creating a new inferior, call post_create_inferior to inform |
655 | the various subcomponents. */ | |
656 | if (child_thr != nullptr) | |
657 | { | |
658 | scoped_restore_current_thread restore; | |
659 | switch_to_thread (child_thr); | |
660 | ||
661 | post_create_inferior (0); | |
662 | } | |
663 | ||
e97007b6 | 664 | return false; |
d83ad864 DB |
665 | } |
666 | ||
e58b0e63 PA |
667 | /* Tell the target to follow the fork we're stopped at. Returns true |
668 | if the inferior should be resumed; false, if the target for some | |
669 | reason decided it's best not to resume. */ | |
670 | ||
5ab2fbf1 SM |
671 | static bool |
672 | follow_fork () | |
c906108c | 673 | { |
5ab2fbf1 SM |
674 | bool follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
675 | bool should_resume = true; | |
e58b0e63 PA |
676 | struct thread_info *tp; |
677 | ||
678 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
679 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
680 | parent thread structure's run control related fields, not just these. |
681 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
682 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 683 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
684 | CORE_ADDR step_range_start = 0; |
685 | CORE_ADDR step_range_end = 0; | |
bf4cb9be TV |
686 | int current_line = 0; |
687 | symtab *current_symtab = NULL; | |
4e3990f4 | 688 | struct frame_id step_frame_id = { 0 }; |
8980e177 | 689 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
690 | |
691 | if (!non_stop) | |
692 | { | |
5b6d1e4f | 693 | process_stratum_target *wait_target; |
e58b0e63 PA |
694 | ptid_t wait_ptid; |
695 | struct target_waitstatus wait_status; | |
696 | ||
697 | /* Get the last target status returned by target_wait(). */ | |
5b6d1e4f | 698 | get_last_target_status (&wait_target, &wait_ptid, &wait_status); |
e58b0e63 PA |
699 | |
700 | /* If not stopped at a fork event, then there's nothing else to | |
701 | do. */ | |
702 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
703 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
704 | return 1; | |
705 | ||
706 | /* Check if we switched over from WAIT_PTID, since the event was | |
707 | reported. */ | |
00431a78 | 708 | if (wait_ptid != minus_one_ptid |
5b6d1e4f PA |
709 | && (current_inferior ()->process_target () != wait_target |
710 | || inferior_ptid != wait_ptid)) | |
e58b0e63 PA |
711 | { |
712 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
713 | target to follow it (in either direction). We'll | |
714 | afterwards refuse to resume, and inform the user what | |
715 | happened. */ | |
5b6d1e4f | 716 | thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid); |
00431a78 | 717 | switch_to_thread (wait_thread); |
5ab2fbf1 | 718 | should_resume = false; |
e58b0e63 PA |
719 | } |
720 | } | |
721 | ||
722 | tp = inferior_thread (); | |
723 | ||
724 | /* If there were any forks/vforks that were caught and are now to be | |
725 | followed, then do so now. */ | |
726 | switch (tp->pending_follow.kind) | |
727 | { | |
728 | case TARGET_WAITKIND_FORKED: | |
729 | case TARGET_WAITKIND_VFORKED: | |
730 | { | |
731 | ptid_t parent, child; | |
732 | ||
733 | /* If the user did a next/step, etc, over a fork call, | |
734 | preserve the stepping state in the fork child. */ | |
735 | if (follow_child && should_resume) | |
736 | { | |
8358c15c JK |
737 | step_resume_breakpoint = clone_momentary_breakpoint |
738 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
739 | step_range_start = tp->control.step_range_start; |
740 | step_range_end = tp->control.step_range_end; | |
bf4cb9be TV |
741 | current_line = tp->current_line; |
742 | current_symtab = tp->current_symtab; | |
16c381f0 | 743 | step_frame_id = tp->control.step_frame_id; |
186c406b TT |
744 | exception_resume_breakpoint |
745 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 746 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
747 | |
748 | /* For now, delete the parent's sr breakpoint, otherwise, | |
749 | parent/child sr breakpoints are considered duplicates, | |
750 | and the child version will not be installed. Remove | |
751 | this when the breakpoints module becomes aware of | |
752 | inferiors and address spaces. */ | |
753 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
754 | tp->control.step_range_start = 0; |
755 | tp->control.step_range_end = 0; | |
756 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 757 | delete_exception_resume_breakpoint (tp); |
8980e177 | 758 | tp->thread_fsm = NULL; |
e58b0e63 PA |
759 | } |
760 | ||
761 | parent = inferior_ptid; | |
762 | child = tp->pending_follow.value.related_pid; | |
763 | ||
5b6d1e4f | 764 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
765 | /* Set up inferior(s) as specified by the caller, and tell the |
766 | target to do whatever is necessary to follow either parent | |
767 | or child. */ | |
768 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
769 | { |
770 | /* Target refused to follow, or there's some other reason | |
771 | we shouldn't resume. */ | |
772 | should_resume = 0; | |
773 | } | |
774 | else | |
775 | { | |
776 | /* This pending follow fork event is now handled, one way | |
777 | or another. The previous selected thread may be gone | |
778 | from the lists by now, but if it is still around, need | |
779 | to clear the pending follow request. */ | |
5b6d1e4f | 780 | tp = find_thread_ptid (parent_targ, parent); |
e58b0e63 PA |
781 | if (tp) |
782 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
783 | ||
784 | /* This makes sure we don't try to apply the "Switched | |
785 | over from WAIT_PID" logic above. */ | |
786 | nullify_last_target_wait_ptid (); | |
787 | ||
1777feb0 | 788 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
789 | if (follow_child) |
790 | { | |
5b6d1e4f | 791 | thread_info *child_thr = find_thread_ptid (parent_targ, child); |
00431a78 | 792 | switch_to_thread (child_thr); |
e58b0e63 PA |
793 | |
794 | /* ... and preserve the stepping state, in case the | |
795 | user was stepping over the fork call. */ | |
796 | if (should_resume) | |
797 | { | |
798 | tp = inferior_thread (); | |
8358c15c JK |
799 | tp->control.step_resume_breakpoint |
800 | = step_resume_breakpoint; | |
16c381f0 JK |
801 | tp->control.step_range_start = step_range_start; |
802 | tp->control.step_range_end = step_range_end; | |
bf4cb9be TV |
803 | tp->current_line = current_line; |
804 | tp->current_symtab = current_symtab; | |
16c381f0 | 805 | tp->control.step_frame_id = step_frame_id; |
186c406b TT |
806 | tp->control.exception_resume_breakpoint |
807 | = exception_resume_breakpoint; | |
8980e177 | 808 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
809 | } |
810 | else | |
811 | { | |
812 | /* If we get here, it was because we're trying to | |
813 | resume from a fork catchpoint, but, the user | |
814 | has switched threads away from the thread that | |
815 | forked. In that case, the resume command | |
816 | issued is most likely not applicable to the | |
817 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 818 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 819 | "before following fork child.")); |
e58b0e63 PA |
820 | } |
821 | ||
822 | /* Reset breakpoints in the child as appropriate. */ | |
823 | follow_inferior_reset_breakpoints (); | |
824 | } | |
e58b0e63 PA |
825 | } |
826 | } | |
827 | break; | |
828 | case TARGET_WAITKIND_SPURIOUS: | |
829 | /* Nothing to follow. */ | |
830 | break; | |
831 | default: | |
832 | internal_error (__FILE__, __LINE__, | |
833 | "Unexpected pending_follow.kind %d\n", | |
834 | tp->pending_follow.kind); | |
835 | break; | |
836 | } | |
c906108c | 837 | |
e58b0e63 | 838 | return should_resume; |
c906108c SS |
839 | } |
840 | ||
d83ad864 | 841 | static void |
6604731b | 842 | follow_inferior_reset_breakpoints (void) |
c906108c | 843 | { |
4e1c45ea PA |
844 | struct thread_info *tp = inferior_thread (); |
845 | ||
6604731b DJ |
846 | /* Was there a step_resume breakpoint? (There was if the user |
847 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
848 | thread number. Cloned step_resume breakpoints are disabled on |
849 | creation, so enable it here now that it is associated with the | |
850 | correct thread. | |
6604731b DJ |
851 | |
852 | step_resumes are a form of bp that are made to be per-thread. | |
853 | Since we created the step_resume bp when the parent process | |
854 | was being debugged, and now are switching to the child process, | |
855 | from the breakpoint package's viewpoint, that's a switch of | |
856 | "threads". We must update the bp's notion of which thread | |
857 | it is for, or it'll be ignored when it triggers. */ | |
858 | ||
8358c15c | 859 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
860 | { |
861 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
862 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
863 | } | |
6604731b | 864 | |
a1aa2221 | 865 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 866 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
867 | { |
868 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
869 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
870 | } | |
186c406b | 871 | |
6604731b DJ |
872 | /* Reinsert all breakpoints in the child. The user may have set |
873 | breakpoints after catching the fork, in which case those | |
874 | were never set in the child, but only in the parent. This makes | |
875 | sure the inserted breakpoints match the breakpoint list. */ | |
876 | ||
877 | breakpoint_re_set (); | |
878 | insert_breakpoints (); | |
c906108c | 879 | } |
c906108c | 880 | |
6c95b8df PA |
881 | /* The child has exited or execed: resume threads of the parent the |
882 | user wanted to be executing. */ | |
883 | ||
884 | static int | |
885 | proceed_after_vfork_done (struct thread_info *thread, | |
886 | void *arg) | |
887 | { | |
888 | int pid = * (int *) arg; | |
889 | ||
00431a78 PA |
890 | if (thread->ptid.pid () == pid |
891 | && thread->state == THREAD_RUNNING | |
892 | && !thread->executing | |
6c95b8df | 893 | && !thread->stop_requested |
1edb66d8 | 894 | && thread->stop_signal () == GDB_SIGNAL_0) |
6c95b8df | 895 | { |
1eb8556f SM |
896 | infrun_debug_printf ("resuming vfork parent thread %s", |
897 | target_pid_to_str (thread->ptid).c_str ()); | |
6c95b8df | 898 | |
00431a78 | 899 | switch_to_thread (thread); |
70509625 | 900 | clear_proceed_status (0); |
64ce06e4 | 901 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
902 | } |
903 | ||
904 | return 0; | |
905 | } | |
906 | ||
907 | /* Called whenever we notice an exec or exit event, to handle | |
908 | detaching or resuming a vfork parent. */ | |
909 | ||
910 | static void | |
911 | handle_vfork_child_exec_or_exit (int exec) | |
912 | { | |
913 | struct inferior *inf = current_inferior (); | |
914 | ||
915 | if (inf->vfork_parent) | |
916 | { | |
917 | int resume_parent = -1; | |
918 | ||
919 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
920 | between the parent and the child. Break the bonds. */ |
921 | inferior *vfork_parent = inf->vfork_parent; | |
922 | inf->vfork_parent->vfork_child = NULL; | |
923 | inf->vfork_parent = NULL; | |
6c95b8df | 924 | |
b73715df TV |
925 | /* If the user wanted to detach from the parent, now is the |
926 | time. */ | |
927 | if (vfork_parent->pending_detach) | |
6c95b8df | 928 | { |
6c95b8df PA |
929 | struct program_space *pspace; |
930 | struct address_space *aspace; | |
931 | ||
1777feb0 | 932 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 933 | |
b73715df | 934 | vfork_parent->pending_detach = 0; |
68c9da30 | 935 | |
18493a00 | 936 | scoped_restore_current_pspace_and_thread restore_thread; |
6c95b8df PA |
937 | |
938 | /* We're letting loose of the parent. */ | |
18493a00 | 939 | thread_info *tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 940 | switch_to_thread (tp); |
6c95b8df PA |
941 | |
942 | /* We're about to detach from the parent, which implicitly | |
943 | removes breakpoints from its address space. There's a | |
944 | catch here: we want to reuse the spaces for the child, | |
945 | but, parent/child are still sharing the pspace at this | |
946 | point, although the exec in reality makes the kernel give | |
947 | the child a fresh set of new pages. The problem here is | |
948 | that the breakpoints module being unaware of this, would | |
949 | likely chose the child process to write to the parent | |
950 | address space. Swapping the child temporarily away from | |
951 | the spaces has the desired effect. Yes, this is "sort | |
952 | of" a hack. */ | |
953 | ||
954 | pspace = inf->pspace; | |
955 | aspace = inf->aspace; | |
956 | inf->aspace = NULL; | |
957 | inf->pspace = NULL; | |
958 | ||
f67c0c91 | 959 | if (print_inferior_events) |
6c95b8df | 960 | { |
a068643d | 961 | std::string pidstr |
b73715df | 962 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 963 | |
223ffa71 | 964 | target_terminal::ours_for_output (); |
6c95b8df PA |
965 | |
966 | if (exec) | |
6f259a23 DB |
967 | { |
968 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 969 | _("[Detaching vfork parent %s " |
a068643d | 970 | "after child exec]\n"), pidstr.c_str ()); |
6f259a23 | 971 | } |
6c95b8df | 972 | else |
6f259a23 DB |
973 | { |
974 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 975 | _("[Detaching vfork parent %s " |
a068643d | 976 | "after child exit]\n"), pidstr.c_str ()); |
6f259a23 | 977 | } |
6c95b8df PA |
978 | } |
979 | ||
b73715df | 980 | target_detach (vfork_parent, 0); |
6c95b8df PA |
981 | |
982 | /* Put it back. */ | |
983 | inf->pspace = pspace; | |
984 | inf->aspace = aspace; | |
6c95b8df PA |
985 | } |
986 | else if (exec) | |
987 | { | |
988 | /* We're staying attached to the parent, so, really give the | |
989 | child a new address space. */ | |
564b1e3f | 990 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
991 | inf->aspace = inf->pspace->aspace; |
992 | inf->removable = 1; | |
993 | set_current_program_space (inf->pspace); | |
994 | ||
b73715df | 995 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
996 | } |
997 | else | |
998 | { | |
6c95b8df PA |
999 | /* If this is a vfork child exiting, then the pspace and |
1000 | aspaces were shared with the parent. Since we're | |
1001 | reporting the process exit, we'll be mourning all that is | |
1002 | found in the address space, and switching to null_ptid, | |
1003 | preparing to start a new inferior. But, since we don't | |
1004 | want to clobber the parent's address/program spaces, we | |
1005 | go ahead and create a new one for this exiting | |
1006 | inferior. */ | |
1007 | ||
18493a00 | 1008 | /* Switch to no-thread while running clone_program_space, so |
5ed8105e PA |
1009 | that clone_program_space doesn't want to read the |
1010 | selected frame of a dead process. */ | |
18493a00 PA |
1011 | scoped_restore_current_thread restore_thread; |
1012 | switch_to_no_thread (); | |
6c95b8df | 1013 | |
53af73bf PA |
1014 | inf->pspace = new program_space (maybe_new_address_space ()); |
1015 | inf->aspace = inf->pspace->aspace; | |
1016 | set_current_program_space (inf->pspace); | |
6c95b8df | 1017 | inf->removable = 1; |
7dcd53a0 | 1018 | inf->symfile_flags = SYMFILE_NO_READ; |
53af73bf | 1019 | clone_program_space (inf->pspace, vfork_parent->pspace); |
6c95b8df | 1020 | |
b73715df | 1021 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1022 | } |
1023 | ||
6c95b8df PA |
1024 | gdb_assert (current_program_space == inf->pspace); |
1025 | ||
1026 | if (non_stop && resume_parent != -1) | |
1027 | { | |
1028 | /* If the user wanted the parent to be running, let it go | |
1029 | free now. */ | |
5ed8105e | 1030 | scoped_restore_current_thread restore_thread; |
6c95b8df | 1031 | |
1eb8556f SM |
1032 | infrun_debug_printf ("resuming vfork parent process %d", |
1033 | resume_parent); | |
6c95b8df PA |
1034 | |
1035 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1036 | } |
1037 | } | |
1038 | } | |
1039 | ||
eb6c553b | 1040 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1041 | |
1042 | static const char follow_exec_mode_new[] = "new"; | |
1043 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1044 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1045 | { |
1046 | follow_exec_mode_new, | |
1047 | follow_exec_mode_same, | |
1048 | NULL, | |
1049 | }; | |
1050 | ||
1051 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1052 | static void | |
1053 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1054 | struct cmd_list_element *c, const char *value) | |
1055 | { | |
1056 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1057 | } | |
1058 | ||
ecf45d2c | 1059 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1060 | |
c906108c | 1061 | static void |
4ca51187 | 1062 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1063 | { |
e99b03dc | 1064 | int pid = ptid.pid (); |
94585166 | 1065 | ptid_t process_ptid; |
7a292a7a | 1066 | |
65d2b333 PW |
1067 | /* Switch terminal for any messages produced e.g. by |
1068 | breakpoint_re_set. */ | |
1069 | target_terminal::ours_for_output (); | |
1070 | ||
c906108c SS |
1071 | /* This is an exec event that we actually wish to pay attention to. |
1072 | Refresh our symbol table to the newly exec'd program, remove any | |
1073 | momentary bp's, etc. | |
1074 | ||
1075 | If there are breakpoints, they aren't really inserted now, | |
1076 | since the exec() transformed our inferior into a fresh set | |
1077 | of instructions. | |
1078 | ||
1079 | We want to preserve symbolic breakpoints on the list, since | |
1080 | we have hopes that they can be reset after the new a.out's | |
1081 | symbol table is read. | |
1082 | ||
1083 | However, any "raw" breakpoints must be removed from the list | |
1084 | (e.g., the solib bp's), since their address is probably invalid | |
1085 | now. | |
1086 | ||
1087 | And, we DON'T want to call delete_breakpoints() here, since | |
1088 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1089 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1090 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1091 | |
1092 | mark_breakpoints_out (); | |
1093 | ||
95e50b27 PA |
1094 | /* The target reports the exec event to the main thread, even if |
1095 | some other thread does the exec, and even if the main thread was | |
1096 | stopped or already gone. We may still have non-leader threads of | |
1097 | the process on our list. E.g., on targets that don't have thread | |
1098 | exit events (like remote); or on native Linux in non-stop mode if | |
1099 | there were only two threads in the inferior and the non-leader | |
1100 | one is the one that execs (and nothing forces an update of the | |
1101 | thread list up to here). When debugging remotely, it's best to | |
1102 | avoid extra traffic, when possible, so avoid syncing the thread | |
1103 | list with the target, and instead go ahead and delete all threads | |
1104 | of the process but one that reported the event. Note this must | |
1105 | be done before calling update_breakpoints_after_exec, as | |
1106 | otherwise clearing the threads' resources would reference stale | |
1107 | thread breakpoints -- it may have been one of these threads that | |
1108 | stepped across the exec. We could just clear their stepping | |
1109 | states, but as long as we're iterating, might as well delete | |
1110 | them. Deleting them now rather than at the next user-visible | |
1111 | stop provides a nicer sequence of events for user and MI | |
1112 | notifications. */ | |
08036331 | 1113 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1114 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1115 | delete_thread (th); |
95e50b27 PA |
1116 | |
1117 | /* We also need to clear any left over stale state for the | |
1118 | leader/event thread. E.g., if there was any step-resume | |
1119 | breakpoint or similar, it's gone now. We cannot truly | |
1120 | step-to-next statement through an exec(). */ | |
08036331 | 1121 | thread_info *th = inferior_thread (); |
8358c15c | 1122 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1123 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1124 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1125 | th->control.step_range_start = 0; |
1126 | th->control.step_range_end = 0; | |
c906108c | 1127 | |
95e50b27 PA |
1128 | /* The user may have had the main thread held stopped in the |
1129 | previous image (e.g., schedlock on, or non-stop). Release | |
1130 | it now. */ | |
a75724bc PA |
1131 | th->stop_requested = 0; |
1132 | ||
95e50b27 PA |
1133 | update_breakpoints_after_exec (); |
1134 | ||
1777feb0 | 1135 | /* What is this a.out's name? */ |
f2907e49 | 1136 | process_ptid = ptid_t (pid); |
6c95b8df | 1137 | printf_unfiltered (_("%s is executing new program: %s\n"), |
a068643d | 1138 | target_pid_to_str (process_ptid).c_str (), |
ecf45d2c | 1139 | exec_file_target); |
c906108c SS |
1140 | |
1141 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1142 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1143 | |
6ca15a4b | 1144 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1145 | |
797bc1cb TT |
1146 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1147 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1148 | |
ecf45d2c SL |
1149 | /* If we were unable to map the executable target pathname onto a host |
1150 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1151 | is confusing. Maybe it would even be better to stop at this point | |
1152 | so that the user can specify a file manually before continuing. */ | |
1153 | if (exec_file_host == NULL) | |
1154 | warning (_("Could not load symbols for executable %s.\n" | |
1155 | "Do you need \"set sysroot\"?"), | |
1156 | exec_file_target); | |
c906108c | 1157 | |
cce9b6bf PA |
1158 | /* Reset the shared library package. This ensures that we get a |
1159 | shlib event when the child reaches "_start", at which point the | |
1160 | dld will have had a chance to initialize the child. */ | |
1161 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1162 | we don't want those to be satisfied by the libraries of the | |
1163 | previous incarnation of this process. */ | |
1164 | no_shared_libraries (NULL, 0); | |
1165 | ||
294c36eb SM |
1166 | struct inferior *inf = current_inferior (); |
1167 | ||
6c95b8df PA |
1168 | if (follow_exec_mode_string == follow_exec_mode_new) |
1169 | { | |
6c95b8df PA |
1170 | /* The user wants to keep the old inferior and program spaces |
1171 | around. Create a new fresh one, and switch to it. */ | |
1172 | ||
35ed81d4 SM |
1173 | /* Do exit processing for the original inferior before setting the new |
1174 | inferior's pid. Having two inferiors with the same pid would confuse | |
1175 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1176 | old to the new inferior. */ | |
294c36eb SM |
1177 | inferior *new_inferior = add_inferior_with_spaces (); |
1178 | ||
1179 | swap_terminal_info (new_inferior, inf); | |
1180 | exit_inferior_silent (inf); | |
1181 | ||
1182 | new_inferior->pid = pid; | |
1183 | target_follow_exec (new_inferior, ptid, exec_file_target); | |
1184 | ||
1185 | /* We continue with the new inferior. */ | |
1186 | inf = new_inferior; | |
6c95b8df | 1187 | } |
9107fc8d PA |
1188 | else |
1189 | { | |
1190 | /* The old description may no longer be fit for the new image. | |
1191 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1192 | old description; we'll read a new one below. No need to do | |
1193 | this on "follow-exec-mode new", as the old inferior stays | |
1194 | around (its description is later cleared/refetched on | |
1195 | restart). */ | |
1196 | target_clear_description (); | |
294c36eb | 1197 | target_follow_exec (inf, ptid, exec_file_target); |
9107fc8d | 1198 | } |
6c95b8df | 1199 | |
294c36eb | 1200 | gdb_assert (current_inferior () == inf); |
6c95b8df PA |
1201 | gdb_assert (current_program_space == inf->pspace); |
1202 | ||
ecf45d2c SL |
1203 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1204 | because the proper displacement for a PIE (Position Independent | |
1205 | Executable) main symbol file will only be computed by | |
1206 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1207 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1208 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1209 | |
9107fc8d PA |
1210 | /* If the target can specify a description, read it. Must do this |
1211 | after flipping to the new executable (because the target supplied | |
1212 | description must be compatible with the executable's | |
1213 | architecture, and the old executable may e.g., be 32-bit, while | |
1214 | the new one 64-bit), and before anything involving memory or | |
1215 | registers. */ | |
1216 | target_find_description (); | |
1217 | ||
42a4fec5 | 1218 | gdb::observers::inferior_execd.notify (inf); |
4efc6507 | 1219 | |
c1e56572 JK |
1220 | breakpoint_re_set (); |
1221 | ||
c906108c SS |
1222 | /* Reinsert all breakpoints. (Those which were symbolic have |
1223 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1224 | to symbol_file_command...). */ |
c906108c SS |
1225 | insert_breakpoints (); |
1226 | ||
1227 | /* The next resume of this inferior should bring it to the shlib | |
1228 | startup breakpoints. (If the user had also set bp's on | |
1229 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1230 | matically get reset there in the new process.). */ |
c906108c SS |
1231 | } |
1232 | ||
28d5518b | 1233 | /* The chain of threads that need to do a step-over operation to get |
c2829269 PA |
1234 | past e.g., a breakpoint. What technique is used to step over the |
1235 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1236 | same queue, to maintain rough temporal order of execution, in order | |
1237 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1238 | constantly stepping the same couple threads past their breakpoints | |
1239 | over and over, if the single-step finish fast enough. */ | |
8b6a69b2 | 1240 | thread_step_over_list global_thread_step_over_list; |
c2829269 | 1241 | |
6c4cfb24 PA |
1242 | /* Bit flags indicating what the thread needs to step over. */ |
1243 | ||
8d297bbf | 1244 | enum step_over_what_flag |
6c4cfb24 PA |
1245 | { |
1246 | /* Step over a breakpoint. */ | |
1247 | STEP_OVER_BREAKPOINT = 1, | |
1248 | ||
1249 | /* Step past a non-continuable watchpoint, in order to let the | |
1250 | instruction execute so we can evaluate the watchpoint | |
1251 | expression. */ | |
1252 | STEP_OVER_WATCHPOINT = 2 | |
1253 | }; | |
8d297bbf | 1254 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1255 | |
963f9c80 | 1256 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1257 | |
1258 | struct step_over_info | |
1259 | { | |
963f9c80 PA |
1260 | /* If we're stepping past a breakpoint, this is the address space |
1261 | and address of the instruction the breakpoint is set at. We'll | |
1262 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1263 | non-NULL. */ | |
ac7d717c PA |
1264 | const address_space *aspace = nullptr; |
1265 | CORE_ADDR address = 0; | |
963f9c80 PA |
1266 | |
1267 | /* The instruction being stepped over triggers a nonsteppable | |
1268 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
ac7d717c | 1269 | int nonsteppable_watchpoint_p = 0; |
21edc42f YQ |
1270 | |
1271 | /* The thread's global number. */ | |
ac7d717c | 1272 | int thread = -1; |
31e77af2 PA |
1273 | }; |
1274 | ||
1275 | /* The step-over info of the location that is being stepped over. | |
1276 | ||
1277 | Note that with async/breakpoint always-inserted mode, a user might | |
1278 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1279 | being stepped over. As setting a new breakpoint inserts all | |
1280 | breakpoints, we need to make sure the breakpoint being stepped over | |
1281 | isn't inserted then. We do that by only clearing the step-over | |
1282 | info when the step-over is actually finished (or aborted). | |
1283 | ||
1284 | Presently GDB can only step over one breakpoint at any given time. | |
1285 | Given threads that can't run code in the same address space as the | |
1286 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1287 | to step-over at most one breakpoint per address space (so this info | |
1288 | could move to the address space object if/when GDB is extended). | |
1289 | The set of breakpoints being stepped over will normally be much | |
1290 | smaller than the set of all breakpoints, so a flag in the | |
1291 | breakpoint location structure would be wasteful. A separate list | |
1292 | also saves complexity and run-time, as otherwise we'd have to go | |
1293 | through all breakpoint locations clearing their flag whenever we | |
1294 | start a new sequence. Similar considerations weigh against storing | |
1295 | this info in the thread object. Plus, not all step overs actually | |
1296 | have breakpoint locations -- e.g., stepping past a single-step | |
1297 | breakpoint, or stepping to complete a non-continuable | |
1298 | watchpoint. */ | |
1299 | static struct step_over_info step_over_info; | |
1300 | ||
1301 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1302 | stepping over. |
1303 | N.B. We record the aspace and address now, instead of say just the thread, | |
1304 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1305 | |
1306 | static void | |
8b86c959 | 1307 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1308 | int nonsteppable_watchpoint_p, |
1309 | int thread) | |
31e77af2 PA |
1310 | { |
1311 | step_over_info.aspace = aspace; | |
1312 | step_over_info.address = address; | |
963f9c80 | 1313 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1314 | step_over_info.thread = thread; |
31e77af2 PA |
1315 | } |
1316 | ||
1317 | /* Called when we're not longer stepping over a breakpoint / an | |
1318 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1319 | ||
1320 | static void | |
1321 | clear_step_over_info (void) | |
1322 | { | |
1eb8556f | 1323 | infrun_debug_printf ("clearing step over info"); |
31e77af2 PA |
1324 | step_over_info.aspace = NULL; |
1325 | step_over_info.address = 0; | |
963f9c80 | 1326 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1327 | step_over_info.thread = -1; |
31e77af2 PA |
1328 | } |
1329 | ||
7f89fd65 | 1330 | /* See infrun.h. */ |
31e77af2 PA |
1331 | |
1332 | int | |
1333 | stepping_past_instruction_at (struct address_space *aspace, | |
1334 | CORE_ADDR address) | |
1335 | { | |
1336 | return (step_over_info.aspace != NULL | |
1337 | && breakpoint_address_match (aspace, address, | |
1338 | step_over_info.aspace, | |
1339 | step_over_info.address)); | |
1340 | } | |
1341 | ||
963f9c80 PA |
1342 | /* See infrun.h. */ |
1343 | ||
21edc42f YQ |
1344 | int |
1345 | thread_is_stepping_over_breakpoint (int thread) | |
1346 | { | |
1347 | return (step_over_info.thread != -1 | |
1348 | && thread == step_over_info.thread); | |
1349 | } | |
1350 | ||
1351 | /* See infrun.h. */ | |
1352 | ||
963f9c80 PA |
1353 | int |
1354 | stepping_past_nonsteppable_watchpoint (void) | |
1355 | { | |
1356 | return step_over_info.nonsteppable_watchpoint_p; | |
1357 | } | |
1358 | ||
6cc83d2a PA |
1359 | /* Returns true if step-over info is valid. */ |
1360 | ||
c4464ade | 1361 | static bool |
6cc83d2a PA |
1362 | step_over_info_valid_p (void) |
1363 | { | |
963f9c80 PA |
1364 | return (step_over_info.aspace != NULL |
1365 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1366 | } |
1367 | ||
c906108c | 1368 | \f |
237fc4c9 PA |
1369 | /* Displaced stepping. */ |
1370 | ||
1371 | /* In non-stop debugging mode, we must take special care to manage | |
1372 | breakpoints properly; in particular, the traditional strategy for | |
1373 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1374 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1375 | breakpoint it has hit while ensuring that other threads running | |
1376 | concurrently will hit the breakpoint as they should. | |
1377 | ||
1378 | The traditional way to step a thread T off a breakpoint in a | |
1379 | multi-threaded program in all-stop mode is as follows: | |
1380 | ||
1381 | a0) Initially, all threads are stopped, and breakpoints are not | |
1382 | inserted. | |
1383 | a1) We single-step T, leaving breakpoints uninserted. | |
1384 | a2) We insert breakpoints, and resume all threads. | |
1385 | ||
1386 | In non-stop debugging, however, this strategy is unsuitable: we | |
1387 | don't want to have to stop all threads in the system in order to | |
1388 | continue or step T past a breakpoint. Instead, we use displaced | |
1389 | stepping: | |
1390 | ||
1391 | n0) Initially, T is stopped, other threads are running, and | |
1392 | breakpoints are inserted. | |
1393 | n1) We copy the instruction "under" the breakpoint to a separate | |
1394 | location, outside the main code stream, making any adjustments | |
1395 | to the instruction, register, and memory state as directed by | |
1396 | T's architecture. | |
1397 | n2) We single-step T over the instruction at its new location. | |
1398 | n3) We adjust the resulting register and memory state as directed | |
1399 | by T's architecture. This includes resetting T's PC to point | |
1400 | back into the main instruction stream. | |
1401 | n4) We resume T. | |
1402 | ||
1403 | This approach depends on the following gdbarch methods: | |
1404 | ||
1405 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1406 | indicate where to copy the instruction, and how much space must | |
1407 | be reserved there. We use these in step n1. | |
1408 | ||
1409 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1410 | address, and makes any necessary adjustments to the instruction, | |
1411 | register contents, and memory. We use this in step n1. | |
1412 | ||
1413 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1414 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1415 | same effect the instruction would have had if we had executed it |
1416 | at its original address. We use this in step n3. | |
1417 | ||
237fc4c9 PA |
1418 | The gdbarch_displaced_step_copy_insn and |
1419 | gdbarch_displaced_step_fixup functions must be written so that | |
1420 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1421 | single-stepping across the copied instruction, and then applying | |
1422 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1423 | thread's memory and registers as stepping the instruction in place | |
1424 | would have. Exactly which responsibilities fall to the copy and | |
1425 | which fall to the fixup is up to the author of those functions. | |
1426 | ||
1427 | See the comments in gdbarch.sh for details. | |
1428 | ||
1429 | Note that displaced stepping and software single-step cannot | |
1430 | currently be used in combination, although with some care I think | |
1431 | they could be made to. Software single-step works by placing | |
1432 | breakpoints on all possible subsequent instructions; if the | |
1433 | displaced instruction is a PC-relative jump, those breakpoints | |
1434 | could fall in very strange places --- on pages that aren't | |
1435 | executable, or at addresses that are not proper instruction | |
1436 | boundaries. (We do generally let other threads run while we wait | |
1437 | to hit the software single-step breakpoint, and they might | |
1438 | encounter such a corrupted instruction.) One way to work around | |
1439 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1440 | simulate the effect of PC-relative instructions (and return NULL) | |
1441 | on architectures that use software single-stepping. | |
1442 | ||
1443 | In non-stop mode, we can have independent and simultaneous step | |
1444 | requests, so more than one thread may need to simultaneously step | |
1445 | over a breakpoint. The current implementation assumes there is | |
1446 | only one scratch space per process. In this case, we have to | |
1447 | serialize access to the scratch space. If thread A wants to step | |
1448 | over a breakpoint, but we are currently waiting for some other | |
1449 | thread to complete a displaced step, we leave thread A stopped and | |
1450 | place it in the displaced_step_request_queue. Whenever a displaced | |
1451 | step finishes, we pick the next thread in the queue and start a new | |
1452 | displaced step operation on it. See displaced_step_prepare and | |
7def77a1 | 1453 | displaced_step_finish for details. */ |
237fc4c9 | 1454 | |
a46d1843 | 1455 | /* Return true if THREAD is doing a displaced step. */ |
c0987663 | 1456 | |
c4464ade | 1457 | static bool |
00431a78 | 1458 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1459 | { |
00431a78 | 1460 | gdb_assert (thread != NULL); |
c0987663 | 1461 | |
187b041e | 1462 | return thread->displaced_step_state.in_progress (); |
c0987663 YQ |
1463 | } |
1464 | ||
a46d1843 | 1465 | /* Return true if INF has a thread doing a displaced step. */ |
8f572e5c | 1466 | |
c4464ade | 1467 | static bool |
00431a78 | 1468 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1469 | { |
187b041e | 1470 | return inf->displaced_step_state.in_progress_count > 0; |
fc1cf338 PA |
1471 | } |
1472 | ||
187b041e | 1473 | /* Return true if any thread is doing a displaced step. */ |
a42244db | 1474 | |
187b041e SM |
1475 | static bool |
1476 | displaced_step_in_progress_any_thread () | |
a42244db | 1477 | { |
187b041e SM |
1478 | for (inferior *inf : all_non_exited_inferiors ()) |
1479 | { | |
1480 | if (displaced_step_in_progress (inf)) | |
1481 | return true; | |
1482 | } | |
a42244db | 1483 | |
187b041e | 1484 | return false; |
a42244db YQ |
1485 | } |
1486 | ||
fc1cf338 PA |
1487 | static void |
1488 | infrun_inferior_exit (struct inferior *inf) | |
1489 | { | |
d20172fc | 1490 | inf->displaced_step_state.reset (); |
fc1cf338 | 1491 | } |
237fc4c9 | 1492 | |
3b7a962d SM |
1493 | static void |
1494 | infrun_inferior_execd (inferior *inf) | |
1495 | { | |
187b041e SM |
1496 | /* If some threads where was doing a displaced step in this inferior at the |
1497 | moment of the exec, they no longer exist. Even if the exec'ing thread | |
3b7a962d SM |
1498 | doing a displaced step, we don't want to to any fixup nor restore displaced |
1499 | stepping buffer bytes. */ | |
1500 | inf->displaced_step_state.reset (); | |
1501 | ||
187b041e SM |
1502 | for (thread_info *thread : inf->threads ()) |
1503 | thread->displaced_step_state.reset (); | |
1504 | ||
3b7a962d SM |
1505 | /* Since an in-line step is done with everything else stopped, if there was |
1506 | one in progress at the time of the exec, it must have been the exec'ing | |
1507 | thread. */ | |
1508 | clear_step_over_info (); | |
1509 | } | |
1510 | ||
fff08868 HZ |
1511 | /* If ON, and the architecture supports it, GDB will use displaced |
1512 | stepping to step over breakpoints. If OFF, or if the architecture | |
1513 | doesn't support it, GDB will instead use the traditional | |
1514 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1515 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1516 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1517 | |
72d0e2c5 | 1518 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1519 | |
237fc4c9 PA |
1520 | static void |
1521 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1522 | struct cmd_list_element *c, | |
1523 | const char *value) | |
1524 | { | |
72d0e2c5 | 1525 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1526 | fprintf_filtered (file, |
1527 | _("Debugger's willingness to use displaced stepping " | |
1528 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1529 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1530 | else |
3e43a32a MS |
1531 | fprintf_filtered (file, |
1532 | _("Debugger's willingness to use displaced stepping " | |
1533 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1534 | } |
1535 | ||
9822cb57 SM |
1536 | /* Return true if the gdbarch implements the required methods to use |
1537 | displaced stepping. */ | |
1538 | ||
1539 | static bool | |
1540 | gdbarch_supports_displaced_stepping (gdbarch *arch) | |
1541 | { | |
187b041e SM |
1542 | /* Only check for the presence of `prepare`. The gdbarch verification ensures |
1543 | that if `prepare` is provided, so is `finish`. */ | |
1544 | return gdbarch_displaced_step_prepare_p (arch); | |
9822cb57 SM |
1545 | } |
1546 | ||
fff08868 | 1547 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1548 | over breakpoints of thread TP. */ |
fff08868 | 1549 | |
9822cb57 SM |
1550 | static bool |
1551 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1552 | { |
9822cb57 SM |
1553 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1554 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1555 | return false; | |
1556 | ||
1557 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1558 | way. */ | |
1559 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1560 | && !target_is_non_stop_p ()) | |
1561 | return false; | |
1562 | ||
1563 | gdbarch *gdbarch = get_thread_regcache (tp)->arch (); | |
1564 | ||
1565 | /* If the architecture doesn't implement displaced stepping, don't use | |
1566 | it. */ | |
1567 | if (!gdbarch_supports_displaced_stepping (gdbarch)) | |
1568 | return false; | |
1569 | ||
1570 | /* If recording, don't use displaced stepping. */ | |
1571 | if (find_record_target () != nullptr) | |
1572 | return false; | |
1573 | ||
9822cb57 SM |
1574 | /* If displaced stepping failed before for this inferior, don't bother trying |
1575 | again. */ | |
f5f01699 | 1576 | if (tp->inf->displaced_step_state.failed_before) |
9822cb57 SM |
1577 | return false; |
1578 | ||
1579 | return true; | |
237fc4c9 PA |
1580 | } |
1581 | ||
187b041e | 1582 | /* Simple function wrapper around displaced_step_thread_state::reset. */ |
d8d83535 | 1583 | |
237fc4c9 | 1584 | static void |
187b041e | 1585 | displaced_step_reset (displaced_step_thread_state *displaced) |
237fc4c9 | 1586 | { |
d8d83535 | 1587 | displaced->reset (); |
237fc4c9 PA |
1588 | } |
1589 | ||
d8d83535 SM |
1590 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1591 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1592 | ||
1593 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 | 1594 | |
136821d9 SM |
1595 | /* See infrun.h. */ |
1596 | ||
1597 | std::string | |
1598 | displaced_step_dump_bytes (const gdb_byte *buf, size_t len) | |
237fc4c9 | 1599 | { |
136821d9 | 1600 | std::string ret; |
237fc4c9 | 1601 | |
136821d9 SM |
1602 | for (size_t i = 0; i < len; i++) |
1603 | { | |
1604 | if (i == 0) | |
1605 | ret += string_printf ("%02x", buf[i]); | |
1606 | else | |
1607 | ret += string_printf (" %02x", buf[i]); | |
1608 | } | |
1609 | ||
1610 | return ret; | |
237fc4c9 PA |
1611 | } |
1612 | ||
1613 | /* Prepare to single-step, using displaced stepping. | |
1614 | ||
1615 | Note that we cannot use displaced stepping when we have a signal to | |
1616 | deliver. If we have a signal to deliver and an instruction to step | |
1617 | over, then after the step, there will be no indication from the | |
1618 | target whether the thread entered a signal handler or ignored the | |
1619 | signal and stepped over the instruction successfully --- both cases | |
1620 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1621 | fixup, and in the second case we must --- but we can't tell which. | |
1622 | Comments in the code for 'random signals' in handle_inferior_event | |
1623 | explain how we handle this case instead. | |
1624 | ||
bab37966 SM |
1625 | Returns DISPLACED_STEP_PREPARE_STATUS_OK if preparing was successful -- this |
1626 | thread is going to be stepped now; DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE | |
1627 | if displaced stepping this thread got queued; or | |
1628 | DISPLACED_STEP_PREPARE_STATUS_CANT if this instruction can't be displaced | |
1629 | stepped. */ | |
7f03bd92 | 1630 | |
bab37966 | 1631 | static displaced_step_prepare_status |
00431a78 | 1632 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1633 | { |
00431a78 | 1634 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1635 | struct gdbarch *gdbarch = regcache->arch (); |
187b041e SM |
1636 | displaced_step_thread_state &disp_step_thread_state |
1637 | = tp->displaced_step_state; | |
237fc4c9 PA |
1638 | |
1639 | /* We should never reach this function if the architecture does not | |
1640 | support displaced stepping. */ | |
9822cb57 | 1641 | gdb_assert (gdbarch_supports_displaced_stepping (gdbarch)); |
237fc4c9 | 1642 | |
c2829269 PA |
1643 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1644 | gdb_assert (tp->control.trap_expected); | |
1645 | ||
c1e36e3e PA |
1646 | /* Disable range stepping while executing in the scratch pad. We |
1647 | want a single-step even if executing the displaced instruction in | |
1648 | the scratch buffer lands within the stepping range (e.g., a | |
1649 | jump/branch). */ | |
1650 | tp->control.may_range_step = 0; | |
1651 | ||
187b041e SM |
1652 | /* We are about to start a displaced step for this thread. If one is already |
1653 | in progress, something's wrong. */ | |
1654 | gdb_assert (!disp_step_thread_state.in_progress ()); | |
237fc4c9 | 1655 | |
187b041e | 1656 | if (tp->inf->displaced_step_state.unavailable) |
237fc4c9 | 1657 | { |
187b041e SM |
1658 | /* The gdbarch tells us it's not worth asking to try a prepare because |
1659 | it is likely that it will return unavailable, so don't bother asking. */ | |
237fc4c9 | 1660 | |
136821d9 SM |
1661 | displaced_debug_printf ("deferring step of %s", |
1662 | target_pid_to_str (tp->ptid).c_str ()); | |
237fc4c9 | 1663 | |
28d5518b | 1664 | global_thread_step_over_chain_enqueue (tp); |
bab37966 | 1665 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; |
237fc4c9 | 1666 | } |
237fc4c9 | 1667 | |
187b041e SM |
1668 | displaced_debug_printf ("displaced-stepping %s now", |
1669 | target_pid_to_str (tp->ptid).c_str ()); | |
237fc4c9 | 1670 | |
00431a78 PA |
1671 | scoped_restore_current_thread restore_thread; |
1672 | ||
1673 | switch_to_thread (tp); | |
ad53cd71 | 1674 | |
187b041e SM |
1675 | CORE_ADDR original_pc = regcache_read_pc (regcache); |
1676 | CORE_ADDR displaced_pc; | |
237fc4c9 | 1677 | |
187b041e SM |
1678 | displaced_step_prepare_status status |
1679 | = gdbarch_displaced_step_prepare (gdbarch, tp, displaced_pc); | |
237fc4c9 | 1680 | |
187b041e | 1681 | if (status == DISPLACED_STEP_PREPARE_STATUS_CANT) |
d35ae833 | 1682 | { |
187b041e SM |
1683 | displaced_debug_printf ("failed to prepare (%s)", |
1684 | target_pid_to_str (tp->ptid).c_str ()); | |
d35ae833 | 1685 | |
bab37966 | 1686 | return DISPLACED_STEP_PREPARE_STATUS_CANT; |
d35ae833 | 1687 | } |
187b041e | 1688 | else if (status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
7f03bd92 | 1689 | { |
187b041e SM |
1690 | /* Not enough displaced stepping resources available, defer this |
1691 | request by placing it the queue. */ | |
1692 | ||
1693 | displaced_debug_printf ("not enough resources available, " | |
1694 | "deferring step of %s", | |
1695 | target_pid_to_str (tp->ptid).c_str ()); | |
1696 | ||
1697 | global_thread_step_over_chain_enqueue (tp); | |
1698 | ||
1699 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; | |
7f03bd92 | 1700 | } |
237fc4c9 | 1701 | |
187b041e SM |
1702 | gdb_assert (status == DISPLACED_STEP_PREPARE_STATUS_OK); |
1703 | ||
9f5a595d UW |
1704 | /* Save the information we need to fix things up if the step |
1705 | succeeds. */ | |
187b041e | 1706 | disp_step_thread_state.set (gdbarch); |
9f5a595d | 1707 | |
187b041e | 1708 | tp->inf->displaced_step_state.in_progress_count++; |
ad53cd71 | 1709 | |
187b041e SM |
1710 | displaced_debug_printf ("prepared successfully thread=%s, " |
1711 | "original_pc=%s, displaced_pc=%s", | |
1712 | target_pid_to_str (tp->ptid).c_str (), | |
1713 | paddress (gdbarch, original_pc), | |
1714 | paddress (gdbarch, displaced_pc)); | |
237fc4c9 | 1715 | |
bab37966 | 1716 | return DISPLACED_STEP_PREPARE_STATUS_OK; |
237fc4c9 PA |
1717 | } |
1718 | ||
3fc8eb30 PA |
1719 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1720 | attempts at displaced stepping if we get a memory error. */ | |
1721 | ||
bab37966 | 1722 | static displaced_step_prepare_status |
00431a78 | 1723 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 | 1724 | { |
bab37966 SM |
1725 | displaced_step_prepare_status status |
1726 | = DISPLACED_STEP_PREPARE_STATUS_CANT; | |
3fc8eb30 | 1727 | |
a70b8144 | 1728 | try |
3fc8eb30 | 1729 | { |
bab37966 | 1730 | status = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1731 | } |
230d2906 | 1732 | catch (const gdb_exception_error &ex) |
3fc8eb30 | 1733 | { |
16b41842 PA |
1734 | if (ex.error != MEMORY_ERROR |
1735 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1736 | throw; |
3fc8eb30 | 1737 | |
1eb8556f SM |
1738 | infrun_debug_printf ("caught exception, disabling displaced stepping: %s", |
1739 | ex.what ()); | |
3fc8eb30 PA |
1740 | |
1741 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1742 | "auto". */ | |
1743 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1744 | { | |
fd7dcb94 | 1745 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1746 | ex.what ()); |
3fc8eb30 PA |
1747 | } |
1748 | ||
1749 | /* Disable further displaced stepping attempts. */ | |
f5f01699 | 1750 | thread->inf->displaced_step_state.failed_before = 1; |
3fc8eb30 | 1751 | } |
3fc8eb30 | 1752 | |
bab37966 | 1753 | return status; |
3fc8eb30 PA |
1754 | } |
1755 | ||
bab37966 SM |
1756 | /* If we displaced stepped an instruction successfully, adjust registers and |
1757 | memory to yield the same effect the instruction would have had if we had | |
1758 | executed it at its original address, and return | |
1759 | DISPLACED_STEP_FINISH_STATUS_OK. If the instruction didn't complete, | |
1760 | relocate the PC and return DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED. | |
372316f1 | 1761 | |
bab37966 SM |
1762 | If the thread wasn't displaced stepping, return |
1763 | DISPLACED_STEP_FINISH_STATUS_OK as well. */ | |
1764 | ||
1765 | static displaced_step_finish_status | |
7def77a1 | 1766 | displaced_step_finish (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1767 | { |
187b041e | 1768 | displaced_step_thread_state *displaced = &event_thread->displaced_step_state; |
fc1cf338 | 1769 | |
187b041e SM |
1770 | /* Was this thread performing a displaced step? */ |
1771 | if (!displaced->in_progress ()) | |
bab37966 | 1772 | return DISPLACED_STEP_FINISH_STATUS_OK; |
237fc4c9 | 1773 | |
187b041e SM |
1774 | gdb_assert (event_thread->inf->displaced_step_state.in_progress_count > 0); |
1775 | event_thread->inf->displaced_step_state.in_progress_count--; | |
1776 | ||
cb71640d PA |
1777 | /* Fixup may need to read memory/registers. Switch to the thread |
1778 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
d43b7a2d | 1779 | the current thread, and displaced_step_restore performs ptid-dependent |
328d42d8 | 1780 | memory accesses using current_inferior(). */ |
00431a78 | 1781 | switch_to_thread (event_thread); |
cb71640d | 1782 | |
d43b7a2d TBA |
1783 | displaced_step_reset_cleanup cleanup (displaced); |
1784 | ||
187b041e SM |
1785 | /* Do the fixup, and release the resources acquired to do the displaced |
1786 | step. */ | |
1787 | return gdbarch_displaced_step_finish (displaced->get_original_gdbarch (), | |
1788 | event_thread, signal); | |
c2829269 | 1789 | } |
1c5cfe86 | 1790 | |
4d9d9d04 PA |
1791 | /* Data to be passed around while handling an event. This data is |
1792 | discarded between events. */ | |
1793 | struct execution_control_state | |
1794 | { | |
5b6d1e4f | 1795 | process_stratum_target *target; |
4d9d9d04 PA |
1796 | ptid_t ptid; |
1797 | /* The thread that got the event, if this was a thread event; NULL | |
1798 | otherwise. */ | |
1799 | struct thread_info *event_thread; | |
1800 | ||
1801 | struct target_waitstatus ws; | |
1802 | int stop_func_filled_in; | |
1803 | CORE_ADDR stop_func_start; | |
1804 | CORE_ADDR stop_func_end; | |
1805 | const char *stop_func_name; | |
1806 | int wait_some_more; | |
1807 | ||
1808 | /* True if the event thread hit the single-step breakpoint of | |
1809 | another thread. Thus the event doesn't cause a stop, the thread | |
1810 | needs to be single-stepped past the single-step breakpoint before | |
1811 | we can switch back to the original stepping thread. */ | |
1812 | int hit_singlestep_breakpoint; | |
1813 | }; | |
1814 | ||
1815 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1816 | |
1817 | static void | |
4d9d9d04 PA |
1818 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1819 | { | |
1820 | memset (ecs, 0, sizeof (*ecs)); | |
1821 | ecs->event_thread = tp; | |
1822 | ecs->ptid = tp->ptid; | |
1823 | } | |
1824 | ||
1825 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1826 | static void prepare_to_wait (struct execution_control_state *ecs); | |
c4464ade | 1827 | static bool keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1828 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1829 | |
1830 | /* Are there any pending step-over requests? If so, run all we can | |
1831 | now and return true. Otherwise, return false. */ | |
1832 | ||
c4464ade | 1833 | static bool |
c2829269 PA |
1834 | start_step_over (void) |
1835 | { | |
3ec3145c SM |
1836 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
1837 | ||
372316f1 PA |
1838 | /* Don't start a new step-over if we already have an in-line |
1839 | step-over operation ongoing. */ | |
1840 | if (step_over_info_valid_p ()) | |
c4464ade | 1841 | return false; |
372316f1 | 1842 | |
187b041e SM |
1843 | /* Steal the global thread step over chain. As we try to initiate displaced |
1844 | steps, threads will be enqueued in the global chain if no buffers are | |
1845 | available. If we iterated on the global chain directly, we might iterate | |
1846 | indefinitely. */ | |
8b6a69b2 SM |
1847 | thread_step_over_list threads_to_step |
1848 | = std::move (global_thread_step_over_list); | |
187b041e SM |
1849 | |
1850 | infrun_debug_printf ("stealing global queue of threads to step, length = %d", | |
1851 | thread_step_over_chain_length (threads_to_step)); | |
1852 | ||
1853 | bool started = false; | |
1854 | ||
1855 | /* On scope exit (whatever the reason, return or exception), if there are | |
1856 | threads left in the THREADS_TO_STEP chain, put back these threads in the | |
1857 | global list. */ | |
1858 | SCOPE_EXIT | |
1859 | { | |
8b6a69b2 | 1860 | if (threads_to_step.empty ()) |
187b041e SM |
1861 | infrun_debug_printf ("step-over queue now empty"); |
1862 | else | |
1863 | { | |
1864 | infrun_debug_printf ("putting back %d threads to step in global queue", | |
1865 | thread_step_over_chain_length (threads_to_step)); | |
1866 | ||
8b6a69b2 SM |
1867 | global_thread_step_over_chain_enqueue_chain |
1868 | (std::move (threads_to_step)); | |
187b041e SM |
1869 | } |
1870 | }; | |
1871 | ||
8b6a69b2 SM |
1872 | thread_step_over_list_safe_range range |
1873 | = make_thread_step_over_list_safe_range (threads_to_step); | |
1874 | ||
1875 | for (thread_info *tp : range) | |
237fc4c9 | 1876 | { |
4d9d9d04 PA |
1877 | struct execution_control_state ecss; |
1878 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1879 | step_over_what step_what; |
372316f1 | 1880 | int must_be_in_line; |
c2829269 | 1881 | |
c65d6b55 PA |
1882 | gdb_assert (!tp->stop_requested); |
1883 | ||
187b041e SM |
1884 | if (tp->inf->displaced_step_state.unavailable) |
1885 | { | |
1886 | /* The arch told us to not even try preparing another displaced step | |
1887 | for this inferior. Just leave the thread in THREADS_TO_STEP, it | |
1888 | will get moved to the global chain on scope exit. */ | |
1889 | continue; | |
1890 | } | |
1891 | ||
1892 | /* Remove thread from the THREADS_TO_STEP chain. If anything goes wrong | |
1893 | while we try to prepare the displaced step, we don't add it back to | |
1894 | the global step over chain. This is to avoid a thread staying in the | |
1895 | step over chain indefinitely if something goes wrong when resuming it | |
1896 | If the error is intermittent and it still needs a step over, it will | |
1897 | get enqueued again when we try to resume it normally. */ | |
8b6a69b2 | 1898 | threads_to_step.erase (threads_to_step.iterator_to (*tp)); |
c2829269 | 1899 | |
372316f1 PA |
1900 | step_what = thread_still_needs_step_over (tp); |
1901 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1902 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1903 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1904 | |
1905 | /* We currently stop all threads of all processes to step-over | |
1906 | in-line. If we need to start a new in-line step-over, let | |
1907 | any pending displaced steps finish first. */ | |
187b041e SM |
1908 | if (must_be_in_line && displaced_step_in_progress_any_thread ()) |
1909 | { | |
1910 | global_thread_step_over_chain_enqueue (tp); | |
1911 | continue; | |
1912 | } | |
c2829269 | 1913 | |
372316f1 | 1914 | if (tp->control.trap_expected |
7846f3aa | 1915 | || tp->resumed () |
372316f1 | 1916 | || tp->executing) |
ad53cd71 | 1917 | { |
4d9d9d04 PA |
1918 | internal_error (__FILE__, __LINE__, |
1919 | "[%s] has inconsistent state: " | |
372316f1 | 1920 | "trap_expected=%d, resumed=%d, executing=%d\n", |
a068643d | 1921 | target_pid_to_str (tp->ptid).c_str (), |
4d9d9d04 | 1922 | tp->control.trap_expected, |
7846f3aa | 1923 | tp->resumed (), |
4d9d9d04 | 1924 | tp->executing); |
ad53cd71 | 1925 | } |
1c5cfe86 | 1926 | |
1eb8556f SM |
1927 | infrun_debug_printf ("resuming [%s] for step-over", |
1928 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 PA |
1929 | |
1930 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
1931 | is no longer inserted. In all-stop, we want to keep looking | |
1932 | for a thread that needs a step-over instead of resuming TP, | |
1933 | because we wouldn't be able to resume anything else until the | |
1934 | target stops again. In non-stop, the resume always resumes | |
1935 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 1936 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 1937 | continue; |
8550d3b3 | 1938 | |
00431a78 | 1939 | switch_to_thread (tp); |
4d9d9d04 PA |
1940 | reset_ecs (ecs, tp); |
1941 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 1942 | |
4d9d9d04 PA |
1943 | if (!ecs->wait_some_more) |
1944 | error (_("Command aborted.")); | |
1c5cfe86 | 1945 | |
187b041e SM |
1946 | /* If the thread's step over could not be initiated because no buffers |
1947 | were available, it was re-added to the global step over chain. */ | |
7846f3aa | 1948 | if (tp->resumed ()) |
187b041e SM |
1949 | { |
1950 | infrun_debug_printf ("[%s] was resumed.", | |
1951 | target_pid_to_str (tp->ptid).c_str ()); | |
1952 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
1953 | } | |
1954 | else | |
1955 | { | |
1956 | infrun_debug_printf ("[%s] was NOT resumed.", | |
1957 | target_pid_to_str (tp->ptid).c_str ()); | |
1958 | gdb_assert (thread_is_in_step_over_chain (tp)); | |
1959 | } | |
372316f1 PA |
1960 | |
1961 | /* If we started a new in-line step-over, we're done. */ | |
1962 | if (step_over_info_valid_p ()) | |
1963 | { | |
1964 | gdb_assert (tp->control.trap_expected); | |
187b041e SM |
1965 | started = true; |
1966 | break; | |
372316f1 PA |
1967 | } |
1968 | ||
fbea99ea | 1969 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
1970 | { |
1971 | /* On all-stop, shouldn't have resumed unless we needed a | |
1972 | step over. */ | |
1973 | gdb_assert (tp->control.trap_expected | |
1974 | || tp->step_after_step_resume_breakpoint); | |
1975 | ||
1976 | /* With remote targets (at least), in all-stop, we can't | |
1977 | issue any further remote commands until the program stops | |
1978 | again. */ | |
187b041e SM |
1979 | started = true; |
1980 | break; | |
1c5cfe86 | 1981 | } |
c2829269 | 1982 | |
4d9d9d04 PA |
1983 | /* Either the thread no longer needed a step-over, or a new |
1984 | displaced stepping sequence started. Even in the latter | |
1985 | case, continue looking. Maybe we can also start another | |
1986 | displaced step on a thread of other process. */ | |
237fc4c9 | 1987 | } |
4d9d9d04 | 1988 | |
187b041e | 1989 | return started; |
237fc4c9 PA |
1990 | } |
1991 | ||
5231c1fd PA |
1992 | /* Update global variables holding ptids to hold NEW_PTID if they were |
1993 | holding OLD_PTID. */ | |
1994 | static void | |
b161a60d SM |
1995 | infrun_thread_ptid_changed (process_stratum_target *target, |
1996 | ptid_t old_ptid, ptid_t new_ptid) | |
5231c1fd | 1997 | { |
b161a60d SM |
1998 | if (inferior_ptid == old_ptid |
1999 | && current_inferior ()->process_target () == target) | |
5231c1fd | 2000 | inferior_ptid = new_ptid; |
5231c1fd PA |
2001 | } |
2002 | ||
237fc4c9 | 2003 | \f |
c906108c | 2004 | |
53904c9e AC |
2005 | static const char schedlock_off[] = "off"; |
2006 | static const char schedlock_on[] = "on"; | |
2007 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2008 | static const char schedlock_replay[] = "replay"; |
40478521 | 2009 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2010 | schedlock_off, |
2011 | schedlock_on, | |
2012 | schedlock_step, | |
f2665db5 | 2013 | schedlock_replay, |
ef346e04 AC |
2014 | NULL |
2015 | }; | |
f2665db5 | 2016 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2017 | static void |
2018 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2019 | struct cmd_list_element *c, const char *value) | |
2020 | { | |
3e43a32a MS |
2021 | fprintf_filtered (file, |
2022 | _("Mode for locking scheduler " | |
2023 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2024 | value); |
2025 | } | |
c906108c SS |
2026 | |
2027 | static void | |
eb4c3f4a | 2028 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2029 | { |
8a3ecb79 | 2030 | if (!target_can_lock_scheduler ()) |
eefe576e AC |
2031 | { |
2032 | scheduler_mode = schedlock_off; | |
d777bf0d SM |
2033 | error (_("Target '%s' cannot support this command."), |
2034 | target_shortname ()); | |
eefe576e | 2035 | } |
c906108c SS |
2036 | } |
2037 | ||
d4db2f36 PA |
2038 | /* True if execution commands resume all threads of all processes by |
2039 | default; otherwise, resume only threads of the current inferior | |
2040 | process. */ | |
491144b5 | 2041 | bool sched_multi = false; |
d4db2f36 | 2042 | |
22b11ba9 LS |
2043 | /* Try to setup for software single stepping. Return true if target_resume() |
2044 | should use hardware single step. | |
2facfe5c | 2045 | |
22b11ba9 | 2046 | GDBARCH the current gdbarch. */ |
2facfe5c | 2047 | |
c4464ade | 2048 | static bool |
22b11ba9 | 2049 | maybe_software_singlestep (struct gdbarch *gdbarch) |
2facfe5c | 2050 | { |
c4464ade | 2051 | bool hw_step = true; |
2facfe5c | 2052 | |
f02253f1 | 2053 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2054 | && gdbarch_software_single_step_p (gdbarch)) |
2055 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2056 | ||
2facfe5c DD |
2057 | return hw_step; |
2058 | } | |
c906108c | 2059 | |
f3263aa4 PA |
2060 | /* See infrun.h. */ |
2061 | ||
09cee04b PA |
2062 | ptid_t |
2063 | user_visible_resume_ptid (int step) | |
2064 | { | |
f3263aa4 | 2065 | ptid_t resume_ptid; |
09cee04b | 2066 | |
09cee04b PA |
2067 | if (non_stop) |
2068 | { | |
2069 | /* With non-stop mode on, threads are always handled | |
2070 | individually. */ | |
2071 | resume_ptid = inferior_ptid; | |
2072 | } | |
2073 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2074 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2075 | { |
f3263aa4 PA |
2076 | /* User-settable 'scheduler' mode requires solo thread |
2077 | resume. */ | |
09cee04b PA |
2078 | resume_ptid = inferior_ptid; |
2079 | } | |
f2665db5 MM |
2080 | else if ((scheduler_mode == schedlock_replay) |
2081 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2082 | { | |
2083 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2084 | mode. */ | |
2085 | resume_ptid = inferior_ptid; | |
2086 | } | |
f3263aa4 PA |
2087 | else if (!sched_multi && target_supports_multi_process ()) |
2088 | { | |
2089 | /* Resume all threads of the current process (and none of other | |
2090 | processes). */ | |
e99b03dc | 2091 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2092 | } |
2093 | else | |
2094 | { | |
2095 | /* Resume all threads of all processes. */ | |
2096 | resume_ptid = RESUME_ALL; | |
2097 | } | |
09cee04b PA |
2098 | |
2099 | return resume_ptid; | |
2100 | } | |
2101 | ||
5b6d1e4f PA |
2102 | /* See infrun.h. */ |
2103 | ||
2104 | process_stratum_target * | |
2105 | user_visible_resume_target (ptid_t resume_ptid) | |
2106 | { | |
2107 | return (resume_ptid == minus_one_ptid && sched_multi | |
2108 | ? NULL | |
2109 | : current_inferior ()->process_target ()); | |
2110 | } | |
2111 | ||
fbea99ea PA |
2112 | /* Return a ptid representing the set of threads that we will resume, |
2113 | in the perspective of the target, assuming run control handling | |
2114 | does not require leaving some threads stopped (e.g., stepping past | |
2115 | breakpoint). USER_STEP indicates whether we're about to start the | |
2116 | target for a stepping command. */ | |
2117 | ||
2118 | static ptid_t | |
2119 | internal_resume_ptid (int user_step) | |
2120 | { | |
2121 | /* In non-stop, we always control threads individually. Note that | |
2122 | the target may always work in non-stop mode even with "set | |
2123 | non-stop off", in which case user_visible_resume_ptid could | |
2124 | return a wildcard ptid. */ | |
2125 | if (target_is_non_stop_p ()) | |
2126 | return inferior_ptid; | |
2127 | else | |
2128 | return user_visible_resume_ptid (user_step); | |
2129 | } | |
2130 | ||
64ce06e4 PA |
2131 | /* Wrapper for target_resume, that handles infrun-specific |
2132 | bookkeeping. */ | |
2133 | ||
2134 | static void | |
c4464ade | 2135 | do_target_resume (ptid_t resume_ptid, bool step, enum gdb_signal sig) |
64ce06e4 PA |
2136 | { |
2137 | struct thread_info *tp = inferior_thread (); | |
2138 | ||
c65d6b55 PA |
2139 | gdb_assert (!tp->stop_requested); |
2140 | ||
64ce06e4 | 2141 | /* Install inferior's terminal modes. */ |
223ffa71 | 2142 | target_terminal::inferior (); |
64ce06e4 PA |
2143 | |
2144 | /* Avoid confusing the next resume, if the next stop/resume | |
2145 | happens to apply to another thread. */ | |
1edb66d8 | 2146 | tp->set_stop_signal (GDB_SIGNAL_0); |
64ce06e4 | 2147 | |
8f572e5c PA |
2148 | /* Advise target which signals may be handled silently. |
2149 | ||
2150 | If we have removed breakpoints because we are stepping over one | |
2151 | in-line (in any thread), we need to receive all signals to avoid | |
2152 | accidentally skipping a breakpoint during execution of a signal | |
2153 | handler. | |
2154 | ||
2155 | Likewise if we're displaced stepping, otherwise a trap for a | |
2156 | breakpoint in a signal handler might be confused with the | |
7def77a1 | 2157 | displaced step finishing. We don't make the displaced_step_finish |
8f572e5c PA |
2158 | step distinguish the cases instead, because: |
2159 | ||
2160 | - a backtrace while stopped in the signal handler would show the | |
2161 | scratch pad as frame older than the signal handler, instead of | |
2162 | the real mainline code. | |
2163 | ||
2164 | - when the thread is later resumed, the signal handler would | |
2165 | return to the scratch pad area, which would no longer be | |
2166 | valid. */ | |
2167 | if (step_over_info_valid_p () | |
00431a78 | 2168 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2169 | target_pass_signals ({}); |
64ce06e4 | 2170 | else |
adc6a863 | 2171 | target_pass_signals (signal_pass); |
64ce06e4 PA |
2172 | |
2173 | target_resume (resume_ptid, step, sig); | |
85ad3aaf | 2174 | |
5b6d1e4f PA |
2175 | if (target_can_async_p ()) |
2176 | target_async (1); | |
64ce06e4 PA |
2177 | } |
2178 | ||
d930703d | 2179 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2180 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2181 | call 'resume', which handles exceptions. */ | |
c906108c | 2182 | |
71d378ae PA |
2183 | static void |
2184 | resume_1 (enum gdb_signal sig) | |
c906108c | 2185 | { |
515630c5 | 2186 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2187 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2188 | struct thread_info *tp = inferior_thread (); |
8b86c959 | 2189 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2190 | ptid_t resume_ptid; |
856e7dd6 PA |
2191 | /* This represents the user's step vs continue request. When |
2192 | deciding whether "set scheduler-locking step" applies, it's the | |
2193 | user's intention that counts. */ | |
2194 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2195 | /* This represents what we'll actually request the target to do. |
2196 | This can decay from a step to a continue, if e.g., we need to | |
2197 | implement single-stepping with breakpoints (software | |
2198 | single-step). */ | |
c4464ade | 2199 | bool step; |
c7e8a53c | 2200 | |
c65d6b55 | 2201 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2202 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2203 | ||
1edb66d8 | 2204 | if (tp->has_pending_waitstatus ()) |
372316f1 | 2205 | { |
1eb8556f SM |
2206 | infrun_debug_printf |
2207 | ("thread %s has pending wait " | |
2208 | "status %s (currently_stepping=%d).", | |
2209 | target_pid_to_str (tp->ptid).c_str (), | |
1edb66d8 | 2210 | target_waitstatus_to_string (&tp->pending_waitstatus ()).c_str (), |
1eb8556f | 2211 | currently_stepping (tp)); |
372316f1 | 2212 | |
5b6d1e4f | 2213 | tp->inf->process_target ()->threads_executing = true; |
7846f3aa | 2214 | tp->set_resumed (true); |
372316f1 PA |
2215 | |
2216 | /* FIXME: What should we do if we are supposed to resume this | |
2217 | thread with a signal? Maybe we should maintain a queue of | |
2218 | pending signals to deliver. */ | |
2219 | if (sig != GDB_SIGNAL_0) | |
2220 | { | |
fd7dcb94 | 2221 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d TT |
2222 | gdb_signal_to_name (sig), |
2223 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2224 | } |
2225 | ||
1edb66d8 | 2226 | tp->set_stop_signal (GDB_SIGNAL_0); |
372316f1 PA |
2227 | |
2228 | if (target_can_async_p ()) | |
9516f85a AB |
2229 | { |
2230 | target_async (1); | |
2231 | /* Tell the event loop we have an event to process. */ | |
2232 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2233 | } | |
372316f1 PA |
2234 | return; |
2235 | } | |
2236 | ||
2237 | tp->stepped_breakpoint = 0; | |
2238 | ||
6b403daa PA |
2239 | /* Depends on stepped_breakpoint. */ |
2240 | step = currently_stepping (tp); | |
2241 | ||
74609e71 YQ |
2242 | if (current_inferior ()->waiting_for_vfork_done) |
2243 | { | |
48f9886d PA |
2244 | /* Don't try to single-step a vfork parent that is waiting for |
2245 | the child to get out of the shared memory region (by exec'ing | |
2246 | or exiting). This is particularly important on software | |
2247 | single-step archs, as the child process would trip on the | |
2248 | software single step breakpoint inserted for the parent | |
2249 | process. Since the parent will not actually execute any | |
2250 | instruction until the child is out of the shared region (such | |
2251 | are vfork's semantics), it is safe to simply continue it. | |
2252 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2253 | the parent, and tell it to `keep_going', which automatically | |
2254 | re-sets it stepping. */ | |
1eb8556f | 2255 | infrun_debug_printf ("resume : clear step"); |
c4464ade | 2256 | step = false; |
74609e71 YQ |
2257 | } |
2258 | ||
7ca9b62a TBA |
2259 | CORE_ADDR pc = regcache_read_pc (regcache); |
2260 | ||
1eb8556f SM |
2261 | infrun_debug_printf ("step=%d, signal=%s, trap_expected=%d, " |
2262 | "current thread [%s] at %s", | |
2263 | step, gdb_signal_to_symbol_string (sig), | |
2264 | tp->control.trap_expected, | |
2265 | target_pid_to_str (inferior_ptid).c_str (), | |
2266 | paddress (gdbarch, pc)); | |
c906108c | 2267 | |
c2c6d25f JM |
2268 | /* Normally, by the time we reach `resume', the breakpoints are either |
2269 | removed or inserted, as appropriate. The exception is if we're sitting | |
2270 | at a permanent breakpoint; we need to step over it, but permanent | |
2271 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2272 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2273 | { |
af48d08f PA |
2274 | if (sig != GDB_SIGNAL_0) |
2275 | { | |
2276 | /* We have a signal to pass to the inferior. The resume | |
2277 | may, or may not take us to the signal handler. If this | |
2278 | is a step, we'll need to stop in the signal handler, if | |
2279 | there's one, (if the target supports stepping into | |
2280 | handlers), or in the next mainline instruction, if | |
2281 | there's no handler. If this is a continue, we need to be | |
2282 | sure to run the handler with all breakpoints inserted. | |
2283 | In all cases, set a breakpoint at the current address | |
2284 | (where the handler returns to), and once that breakpoint | |
2285 | is hit, resume skipping the permanent breakpoint. If | |
2286 | that breakpoint isn't hit, then we've stepped into the | |
2287 | signal handler (or hit some other event). We'll delete | |
2288 | the step-resume breakpoint then. */ | |
2289 | ||
1eb8556f SM |
2290 | infrun_debug_printf ("resume: skipping permanent breakpoint, " |
2291 | "deliver signal first"); | |
af48d08f PA |
2292 | |
2293 | clear_step_over_info (); | |
2294 | tp->control.trap_expected = 0; | |
2295 | ||
2296 | if (tp->control.step_resume_breakpoint == NULL) | |
2297 | { | |
2298 | /* Set a "high-priority" step-resume, as we don't want | |
2299 | user breakpoints at PC to trigger (again) when this | |
2300 | hits. */ | |
2301 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2302 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2303 | ||
2304 | tp->step_after_step_resume_breakpoint = step; | |
2305 | } | |
2306 | ||
2307 | insert_breakpoints (); | |
2308 | } | |
2309 | else | |
2310 | { | |
2311 | /* There's no signal to pass, we can go ahead and skip the | |
2312 | permanent breakpoint manually. */ | |
1eb8556f | 2313 | infrun_debug_printf ("skipping permanent breakpoint"); |
af48d08f PA |
2314 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); |
2315 | /* Update pc to reflect the new address from which we will | |
2316 | execute instructions. */ | |
2317 | pc = regcache_read_pc (regcache); | |
2318 | ||
2319 | if (step) | |
2320 | { | |
2321 | /* We've already advanced the PC, so the stepping part | |
2322 | is done. Now we need to arrange for a trap to be | |
2323 | reported to handle_inferior_event. Set a breakpoint | |
2324 | at the current PC, and run to it. Don't update | |
2325 | prev_pc, because if we end in | |
44a1ee51 PA |
2326 | switch_back_to_stepped_thread, we want the "expected |
2327 | thread advanced also" branch to be taken. IOW, we | |
2328 | don't want this thread to step further from PC | |
af48d08f | 2329 | (overstep). */ |
1ac806b8 | 2330 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2331 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2332 | insert_breakpoints (); | |
2333 | ||
fbea99ea | 2334 | resume_ptid = internal_resume_ptid (user_step); |
c4464ade | 2335 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
7846f3aa | 2336 | tp->set_resumed (true); |
af48d08f PA |
2337 | return; |
2338 | } | |
2339 | } | |
6d350bb5 | 2340 | } |
c2c6d25f | 2341 | |
c1e36e3e PA |
2342 | /* If we have a breakpoint to step over, make sure to do a single |
2343 | step only. Same if we have software watchpoints. */ | |
2344 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2345 | tp->control.may_range_step = 0; | |
2346 | ||
7da6a5b9 LM |
2347 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2348 | copy of the instruction at a different address. | |
237fc4c9 PA |
2349 | |
2350 | We can't use displaced stepping when we have a signal to deliver; | |
2351 | the comments for displaced_step_prepare explain why. The | |
2352 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2353 | signals' explain what we do instead. |
2354 | ||
2355 | We can't use displaced stepping when we are waiting for vfork_done | |
2356 | event, displaced stepping breaks the vfork child similarly as single | |
2357 | step software breakpoint. */ | |
3fc8eb30 PA |
2358 | if (tp->control.trap_expected |
2359 | && use_displaced_stepping (tp) | |
cb71640d | 2360 | && !step_over_info_valid_p () |
a493e3e2 | 2361 | && sig == GDB_SIGNAL_0 |
74609e71 | 2362 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2363 | { |
bab37966 SM |
2364 | displaced_step_prepare_status prepare_status |
2365 | = displaced_step_prepare (tp); | |
fc1cf338 | 2366 | |
bab37966 | 2367 | if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
d56b7306 | 2368 | { |
1eb8556f | 2369 | infrun_debug_printf ("Got placed in step-over queue"); |
4d9d9d04 PA |
2370 | |
2371 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2372 | return; |
2373 | } | |
bab37966 | 2374 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_CANT) |
3fc8eb30 PA |
2375 | { |
2376 | /* Fallback to stepping over the breakpoint in-line. */ | |
2377 | ||
2378 | if (target_is_non_stop_p ()) | |
2379 | stop_all_threads (); | |
2380 | ||
a01bda52 | 2381 | set_step_over_info (regcache->aspace (), |
21edc42f | 2382 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 | 2383 | |
22b11ba9 | 2384 | step = maybe_software_singlestep (gdbarch); |
3fc8eb30 PA |
2385 | |
2386 | insert_breakpoints (); | |
2387 | } | |
bab37966 | 2388 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_OK) |
3fc8eb30 | 2389 | { |
3fc8eb30 PA |
2390 | /* Update pc to reflect the new address from which we will |
2391 | execute instructions due to displaced stepping. */ | |
00431a78 | 2392 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2393 | |
40a53766 | 2394 | step = gdbarch_displaced_step_hw_singlestep (gdbarch); |
3fc8eb30 | 2395 | } |
bab37966 SM |
2396 | else |
2397 | gdb_assert_not_reached (_("Invalid displaced_step_prepare_status " | |
2398 | "value.")); | |
237fc4c9 PA |
2399 | } |
2400 | ||
2facfe5c | 2401 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2402 | else if (step) |
22b11ba9 | 2403 | step = maybe_software_singlestep (gdbarch); |
c906108c | 2404 | |
30852783 UW |
2405 | /* Currently, our software single-step implementation leads to different |
2406 | results than hardware single-stepping in one situation: when stepping | |
2407 | into delivering a signal which has an associated signal handler, | |
2408 | hardware single-step will stop at the first instruction of the handler, | |
2409 | while software single-step will simply skip execution of the handler. | |
2410 | ||
2411 | For now, this difference in behavior is accepted since there is no | |
2412 | easy way to actually implement single-stepping into a signal handler | |
2413 | without kernel support. | |
2414 | ||
2415 | However, there is one scenario where this difference leads to follow-on | |
2416 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2417 | and then single-stepping. In this case, the software single-step | |
2418 | behavior means that even if there is a *breakpoint* in the signal | |
2419 | handler, GDB still would not stop. | |
2420 | ||
2421 | Fortunately, we can at least fix this particular issue. We detect | |
2422 | here the case where we are about to deliver a signal while software | |
2423 | single-stepping with breakpoints removed. In this situation, we | |
2424 | revert the decisions to remove all breakpoints and insert single- | |
2425 | step breakpoints, and instead we install a step-resume breakpoint | |
2426 | at the current address, deliver the signal without stepping, and | |
2427 | once we arrive back at the step-resume breakpoint, actually step | |
2428 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2429 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2430 | && sig != GDB_SIGNAL_0 |
2431 | && step_over_info_valid_p ()) | |
30852783 UW |
2432 | { |
2433 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2434 | immediately after a handler returns, might already have |
30852783 UW |
2435 | a step-resume breakpoint set on the earlier handler. We cannot |
2436 | set another step-resume breakpoint; just continue on until the | |
2437 | original breakpoint is hit. */ | |
2438 | if (tp->control.step_resume_breakpoint == NULL) | |
2439 | { | |
2c03e5be | 2440 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2441 | tp->step_after_step_resume_breakpoint = 1; |
2442 | } | |
2443 | ||
34b7e8a6 | 2444 | delete_single_step_breakpoints (tp); |
30852783 | 2445 | |
31e77af2 | 2446 | clear_step_over_info (); |
30852783 | 2447 | tp->control.trap_expected = 0; |
31e77af2 PA |
2448 | |
2449 | insert_breakpoints (); | |
30852783 UW |
2450 | } |
2451 | ||
b0f16a3e SM |
2452 | /* If STEP is set, it's a request to use hardware stepping |
2453 | facilities. But in that case, we should never | |
2454 | use singlestep breakpoint. */ | |
34b7e8a6 | 2455 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2456 | |
fbea99ea | 2457 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2458 | if (tp->control.trap_expected) |
b0f16a3e SM |
2459 | { |
2460 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2461 | hit, either by single-stepping the thread with the breakpoint |
2462 | removed, or by displaced stepping, with the breakpoint inserted. | |
2463 | In the former case, we need to single-step only this thread, | |
2464 | and keep others stopped, as they can miss this breakpoint if | |
2465 | allowed to run. That's not really a problem for displaced | |
2466 | stepping, but, we still keep other threads stopped, in case | |
2467 | another thread is also stopped for a breakpoint waiting for | |
2468 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2469 | resume_ptid = inferior_ptid; |
2470 | } | |
fbea99ea PA |
2471 | else |
2472 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2473 | |
7f5ef605 PA |
2474 | if (execution_direction != EXEC_REVERSE |
2475 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2476 | { |
372316f1 PA |
2477 | /* There are two cases where we currently need to step a |
2478 | breakpoint instruction when we have a signal to deliver: | |
2479 | ||
2480 | - See handle_signal_stop where we handle random signals that | |
2481 | could take out us out of the stepping range. Normally, in | |
2482 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2483 | signal handler with a breakpoint at PC, but there are cases |
2484 | where we should _always_ single-step, even if we have a | |
2485 | step-resume breakpoint, like when a software watchpoint is | |
2486 | set. Assuming single-stepping and delivering a signal at the | |
2487 | same time would takes us to the signal handler, then we could | |
2488 | have removed the breakpoint at PC to step over it. However, | |
2489 | some hardware step targets (like e.g., Mac OS) can't step | |
2490 | into signal handlers, and for those, we need to leave the | |
2491 | breakpoint at PC inserted, as otherwise if the handler | |
2492 | recurses and executes PC again, it'll miss the breakpoint. | |
2493 | So we leave the breakpoint inserted anyway, but we need to | |
2494 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2495 | that adjust_pc_after_break doesn't end up confused. |
2496 | ||
dda83cd7 | 2497 | - In non-stop if we insert a breakpoint (e.g., a step-resume) |
372316f1 PA |
2498 | in one thread after another thread that was stepping had been |
2499 | momentarily paused for a step-over. When we re-resume the | |
2500 | stepping thread, it may be resumed from that address with a | |
2501 | breakpoint that hasn't trapped yet. Seen with | |
2502 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2503 | do displaced stepping. */ | |
2504 | ||
1eb8556f SM |
2505 | infrun_debug_printf ("resume: [%s] stepped breakpoint", |
2506 | target_pid_to_str (tp->ptid).c_str ()); | |
7f5ef605 PA |
2507 | |
2508 | tp->stepped_breakpoint = 1; | |
2509 | ||
b0f16a3e SM |
2510 | /* Most targets can step a breakpoint instruction, thus |
2511 | executing it normally. But if this one cannot, just | |
2512 | continue and we will hit it anyway. */ | |
7f5ef605 | 2513 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4464ade | 2514 | step = false; |
b0f16a3e | 2515 | } |
ef5cf84e | 2516 | |
b0f16a3e | 2517 | if (debug_displaced |
cb71640d | 2518 | && tp->control.trap_expected |
3fc8eb30 | 2519 | && use_displaced_stepping (tp) |
cb71640d | 2520 | && !step_over_info_valid_p ()) |
b0f16a3e | 2521 | { |
00431a78 | 2522 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2523 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2524 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2525 | gdb_byte buf[4]; | |
2526 | ||
b0f16a3e | 2527 | read_memory (actual_pc, buf, sizeof (buf)); |
136821d9 SM |
2528 | displaced_debug_printf ("run %s: %s", |
2529 | paddress (resume_gdbarch, actual_pc), | |
2530 | displaced_step_dump_bytes | |
2531 | (buf, sizeof (buf)).c_str ()); | |
b0f16a3e | 2532 | } |
237fc4c9 | 2533 | |
b0f16a3e SM |
2534 | if (tp->control.may_range_step) |
2535 | { | |
2536 | /* If we're resuming a thread with the PC out of the step | |
2537 | range, then we're doing some nested/finer run control | |
2538 | operation, like stepping the thread out of the dynamic | |
2539 | linker or the displaced stepping scratch pad. We | |
2540 | shouldn't have allowed a range step then. */ | |
2541 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2542 | } | |
c1e36e3e | 2543 | |
64ce06e4 | 2544 | do_target_resume (resume_ptid, step, sig); |
7846f3aa | 2545 | tp->set_resumed (true); |
c906108c | 2546 | } |
71d378ae PA |
2547 | |
2548 | /* Resume the inferior. SIG is the signal to give the inferior | |
2549 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2550 | rolls back state on error. */ | |
2551 | ||
aff4e175 | 2552 | static void |
71d378ae PA |
2553 | resume (gdb_signal sig) |
2554 | { | |
a70b8144 | 2555 | try |
71d378ae PA |
2556 | { |
2557 | resume_1 (sig); | |
2558 | } | |
230d2906 | 2559 | catch (const gdb_exception &ex) |
71d378ae PA |
2560 | { |
2561 | /* If resuming is being aborted for any reason, delete any | |
2562 | single-step breakpoint resume_1 may have created, to avoid | |
2563 | confusing the following resumption, and to avoid leaving | |
2564 | single-step breakpoints perturbing other threads, in case | |
2565 | we're running in non-stop mode. */ | |
2566 | if (inferior_ptid != null_ptid) | |
2567 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2568 | throw; |
71d378ae | 2569 | } |
71d378ae PA |
2570 | } |
2571 | ||
c906108c | 2572 | \f |
237fc4c9 | 2573 | /* Proceeding. */ |
c906108c | 2574 | |
4c2f2a79 PA |
2575 | /* See infrun.h. */ |
2576 | ||
2577 | /* Counter that tracks number of user visible stops. This can be used | |
2578 | to tell whether a command has proceeded the inferior past the | |
2579 | current location. This allows e.g., inferior function calls in | |
2580 | breakpoint commands to not interrupt the command list. When the | |
2581 | call finishes successfully, the inferior is standing at the same | |
2582 | breakpoint as if nothing happened (and so we don't call | |
2583 | normal_stop). */ | |
2584 | static ULONGEST current_stop_id; | |
2585 | ||
2586 | /* See infrun.h. */ | |
2587 | ||
2588 | ULONGEST | |
2589 | get_stop_id (void) | |
2590 | { | |
2591 | return current_stop_id; | |
2592 | } | |
2593 | ||
2594 | /* Called when we report a user visible stop. */ | |
2595 | ||
2596 | static void | |
2597 | new_stop_id (void) | |
2598 | { | |
2599 | current_stop_id++; | |
2600 | } | |
2601 | ||
c906108c SS |
2602 | /* Clear out all variables saying what to do when inferior is continued. |
2603 | First do this, then set the ones you want, then call `proceed'. */ | |
2604 | ||
a7212384 UW |
2605 | static void |
2606 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2607 | { |
1eb8556f | 2608 | infrun_debug_printf ("%s", target_pid_to_str (tp->ptid).c_str ()); |
d6b48e9c | 2609 | |
372316f1 PA |
2610 | /* If we're starting a new sequence, then the previous finished |
2611 | single-step is no longer relevant. */ | |
1edb66d8 | 2612 | if (tp->has_pending_waitstatus ()) |
372316f1 | 2613 | { |
1edb66d8 | 2614 | if (tp->stop_reason () == TARGET_STOPPED_BY_SINGLE_STEP) |
372316f1 | 2615 | { |
1eb8556f SM |
2616 | infrun_debug_printf ("pending event of %s was a finished step. " |
2617 | "Discarding.", | |
2618 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 2619 | |
1edb66d8 SM |
2620 | tp->clear_pending_waitstatus (); |
2621 | tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON); | |
372316f1 | 2622 | } |
1eb8556f | 2623 | else |
372316f1 | 2624 | { |
1eb8556f SM |
2625 | infrun_debug_printf |
2626 | ("thread %s has pending wait status %s (currently_stepping=%d).", | |
2627 | target_pid_to_str (tp->ptid).c_str (), | |
1edb66d8 | 2628 | target_waitstatus_to_string (&tp->pending_waitstatus ()).c_str (), |
1eb8556f | 2629 | currently_stepping (tp)); |
372316f1 PA |
2630 | } |
2631 | } | |
2632 | ||
70509625 PA |
2633 | /* If this signal should not be seen by program, give it zero. |
2634 | Used for debugging signals. */ | |
1edb66d8 SM |
2635 | if (!signal_pass_state (tp->stop_signal ())) |
2636 | tp->set_stop_signal (GDB_SIGNAL_0); | |
70509625 | 2637 | |
46e3ed7f | 2638 | delete tp->thread_fsm; |
243a9253 PA |
2639 | tp->thread_fsm = NULL; |
2640 | ||
16c381f0 JK |
2641 | tp->control.trap_expected = 0; |
2642 | tp->control.step_range_start = 0; | |
2643 | tp->control.step_range_end = 0; | |
c1e36e3e | 2644 | tp->control.may_range_step = 0; |
16c381f0 JK |
2645 | tp->control.step_frame_id = null_frame_id; |
2646 | tp->control.step_stack_frame_id = null_frame_id; | |
2647 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2648 | tp->control.step_start_function = NULL; |
a7212384 | 2649 | tp->stop_requested = 0; |
4e1c45ea | 2650 | |
16c381f0 | 2651 | tp->control.stop_step = 0; |
32400beb | 2652 | |
16c381f0 | 2653 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2654 | |
856e7dd6 | 2655 | tp->control.stepping_command = 0; |
17b2616c | 2656 | |
a7212384 | 2657 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2658 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2659 | } |
32400beb | 2660 | |
a7212384 | 2661 | void |
70509625 | 2662 | clear_proceed_status (int step) |
a7212384 | 2663 | { |
f2665db5 MM |
2664 | /* With scheduler-locking replay, stop replaying other threads if we're |
2665 | not replaying the user-visible resume ptid. | |
2666 | ||
2667 | This is a convenience feature to not require the user to explicitly | |
2668 | stop replaying the other threads. We're assuming that the user's | |
2669 | intent is to resume tracing the recorded process. */ | |
2670 | if (!non_stop && scheduler_mode == schedlock_replay | |
2671 | && target_record_is_replaying (minus_one_ptid) | |
2672 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2673 | execution_direction)) | |
2674 | target_record_stop_replaying (); | |
2675 | ||
08036331 | 2676 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2677 | { |
08036331 | 2678 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2679 | process_stratum_target *resume_target |
2680 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2681 | |
2682 | /* In all-stop mode, delete the per-thread status of all threads | |
2683 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2684 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2685 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2686 | } |
2687 | ||
d7e15655 | 2688 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2689 | { |
2690 | struct inferior *inferior; | |
2691 | ||
2692 | if (non_stop) | |
2693 | { | |
6c95b8df PA |
2694 | /* If in non-stop mode, only delete the per-thread status of |
2695 | the current thread. */ | |
a7212384 UW |
2696 | clear_proceed_status_thread (inferior_thread ()); |
2697 | } | |
6c95b8df | 2698 | |
d6b48e9c | 2699 | inferior = current_inferior (); |
16c381f0 | 2700 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2701 | } |
2702 | ||
76727919 | 2703 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2704 | } |
2705 | ||
99619bea PA |
2706 | /* Returns true if TP is still stopped at a breakpoint that needs |
2707 | stepping-over in order to make progress. If the breakpoint is gone | |
2708 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b | 2709 | |
c4464ade | 2710 | static bool |
6c4cfb24 | 2711 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2712 | { |
2713 | if (tp->stepping_over_breakpoint) | |
2714 | { | |
00431a78 | 2715 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2716 | |
a01bda52 | 2717 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2718 | regcache_read_pc (regcache)) |
2719 | == ordinary_breakpoint_here) | |
c4464ade | 2720 | return true; |
99619bea PA |
2721 | |
2722 | tp->stepping_over_breakpoint = 0; | |
2723 | } | |
2724 | ||
c4464ade | 2725 | return false; |
99619bea PA |
2726 | } |
2727 | ||
6c4cfb24 PA |
2728 | /* Check whether thread TP still needs to start a step-over in order |
2729 | to make progress when resumed. Returns an bitwise or of enum | |
2730 | step_over_what bits, indicating what needs to be stepped over. */ | |
2731 | ||
8d297bbf | 2732 | static step_over_what |
6c4cfb24 PA |
2733 | thread_still_needs_step_over (struct thread_info *tp) |
2734 | { | |
8d297bbf | 2735 | step_over_what what = 0; |
6c4cfb24 PA |
2736 | |
2737 | if (thread_still_needs_step_over_bp (tp)) | |
2738 | what |= STEP_OVER_BREAKPOINT; | |
2739 | ||
2740 | if (tp->stepping_over_watchpoint | |
9aed480c | 2741 | && !target_have_steppable_watchpoint ()) |
6c4cfb24 PA |
2742 | what |= STEP_OVER_WATCHPOINT; |
2743 | ||
2744 | return what; | |
2745 | } | |
2746 | ||
483805cf PA |
2747 | /* Returns true if scheduler locking applies. STEP indicates whether |
2748 | we're about to do a step/next-like command to a thread. */ | |
2749 | ||
c4464ade | 2750 | static bool |
856e7dd6 | 2751 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2752 | { |
2753 | return (scheduler_mode == schedlock_on | |
2754 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2755 | && tp->control.stepping_command) |
2756 | || (scheduler_mode == schedlock_replay | |
2757 | && target_record_will_replay (minus_one_ptid, | |
2758 | execution_direction))); | |
483805cf PA |
2759 | } |
2760 | ||
1192f124 SM |
2761 | /* Set process_stratum_target::COMMIT_RESUMED_STATE in all target |
2762 | stacks that have threads executing and don't have threads with | |
2763 | pending events. */ | |
5b6d1e4f PA |
2764 | |
2765 | static void | |
1192f124 SM |
2766 | maybe_set_commit_resumed_all_targets () |
2767 | { | |
b4b1a226 SM |
2768 | scoped_restore_current_thread restore_thread; |
2769 | ||
1192f124 SM |
2770 | for (inferior *inf : all_non_exited_inferiors ()) |
2771 | { | |
2772 | process_stratum_target *proc_target = inf->process_target (); | |
2773 | ||
2774 | if (proc_target->commit_resumed_state) | |
2775 | { | |
2776 | /* We already set this in a previous iteration, via another | |
2777 | inferior sharing the process_stratum target. */ | |
2778 | continue; | |
2779 | } | |
2780 | ||
2781 | /* If the target has no resumed threads, it would be useless to | |
2782 | ask it to commit the resumed threads. */ | |
2783 | if (!proc_target->threads_executing) | |
2784 | { | |
2785 | infrun_debug_printf ("not requesting commit-resumed for target " | |
2786 | "%s, no resumed threads", | |
2787 | proc_target->shortname ()); | |
2788 | continue; | |
2789 | } | |
2790 | ||
2791 | /* As an optimization, if a thread from this target has some | |
2792 | status to report, handle it before requiring the target to | |
2793 | commit its resumed threads: handling the status might lead to | |
2794 | resuming more threads. */ | |
273dadf2 | 2795 | if (proc_target->has_resumed_with_pending_wait_status ()) |
1192f124 SM |
2796 | { |
2797 | infrun_debug_printf ("not requesting commit-resumed for target %s, a" | |
2798 | " thread has a pending waitstatus", | |
2799 | proc_target->shortname ()); | |
2800 | continue; | |
2801 | } | |
2802 | ||
b4b1a226 SM |
2803 | switch_to_inferior_no_thread (inf); |
2804 | ||
2805 | if (target_has_pending_events ()) | |
2806 | { | |
2807 | infrun_debug_printf ("not requesting commit-resumed for target %s, " | |
2808 | "target has pending events", | |
2809 | proc_target->shortname ()); | |
2810 | continue; | |
2811 | } | |
2812 | ||
1192f124 SM |
2813 | infrun_debug_printf ("enabling commit-resumed for target %s", |
2814 | proc_target->shortname ()); | |
2815 | ||
2816 | proc_target->commit_resumed_state = true; | |
2817 | } | |
2818 | } | |
2819 | ||
2820 | /* See infrun.h. */ | |
2821 | ||
2822 | void | |
2823 | maybe_call_commit_resumed_all_targets () | |
5b6d1e4f PA |
2824 | { |
2825 | scoped_restore_current_thread restore_thread; | |
2826 | ||
1192f124 SM |
2827 | for (inferior *inf : all_non_exited_inferiors ()) |
2828 | { | |
2829 | process_stratum_target *proc_target = inf->process_target (); | |
2830 | ||
2831 | if (!proc_target->commit_resumed_state) | |
2832 | continue; | |
2833 | ||
2834 | switch_to_inferior_no_thread (inf); | |
2835 | ||
2836 | infrun_debug_printf ("calling commit_resumed for target %s", | |
2837 | proc_target->shortname()); | |
2838 | ||
2839 | target_commit_resumed (); | |
2840 | } | |
2841 | } | |
2842 | ||
2843 | /* To track nesting of scoped_disable_commit_resumed objects, ensuring | |
2844 | that only the outermost one attempts to re-enable | |
2845 | commit-resumed. */ | |
2846 | static bool enable_commit_resumed = true; | |
2847 | ||
2848 | /* See infrun.h. */ | |
2849 | ||
2850 | scoped_disable_commit_resumed::scoped_disable_commit_resumed | |
2851 | (const char *reason) | |
2852 | : m_reason (reason), | |
2853 | m_prev_enable_commit_resumed (enable_commit_resumed) | |
2854 | { | |
2855 | infrun_debug_printf ("reason=%s", m_reason); | |
2856 | ||
2857 | enable_commit_resumed = false; | |
5b6d1e4f PA |
2858 | |
2859 | for (inferior *inf : all_non_exited_inferiors ()) | |
1192f124 SM |
2860 | { |
2861 | process_stratum_target *proc_target = inf->process_target (); | |
5b6d1e4f | 2862 | |
1192f124 SM |
2863 | if (m_prev_enable_commit_resumed) |
2864 | { | |
2865 | /* This is the outermost instance: force all | |
2866 | COMMIT_RESUMED_STATE to false. */ | |
2867 | proc_target->commit_resumed_state = false; | |
2868 | } | |
2869 | else | |
2870 | { | |
2871 | /* This is not the outermost instance, we expect | |
2872 | COMMIT_RESUMED_STATE to have been cleared by the | |
2873 | outermost instance. */ | |
2874 | gdb_assert (!proc_target->commit_resumed_state); | |
2875 | } | |
2876 | } | |
2877 | } | |
2878 | ||
2879 | /* See infrun.h. */ | |
2880 | ||
2881 | void | |
2882 | scoped_disable_commit_resumed::reset () | |
2883 | { | |
2884 | if (m_reset) | |
2885 | return; | |
2886 | m_reset = true; | |
2887 | ||
2888 | infrun_debug_printf ("reason=%s", m_reason); | |
2889 | ||
2890 | gdb_assert (!enable_commit_resumed); | |
2891 | ||
2892 | enable_commit_resumed = m_prev_enable_commit_resumed; | |
2893 | ||
2894 | if (m_prev_enable_commit_resumed) | |
5b6d1e4f | 2895 | { |
1192f124 SM |
2896 | /* This is the outermost instance, re-enable |
2897 | COMMIT_RESUMED_STATE on the targets where it's possible. */ | |
2898 | maybe_set_commit_resumed_all_targets (); | |
2899 | } | |
2900 | else | |
2901 | { | |
2902 | /* This is not the outermost instance, we expect | |
2903 | COMMIT_RESUMED_STATE to still be false. */ | |
2904 | for (inferior *inf : all_non_exited_inferiors ()) | |
2905 | { | |
2906 | process_stratum_target *proc_target = inf->process_target (); | |
2907 | gdb_assert (!proc_target->commit_resumed_state); | |
2908 | } | |
2909 | } | |
2910 | } | |
2911 | ||
2912 | /* See infrun.h. */ | |
2913 | ||
2914 | scoped_disable_commit_resumed::~scoped_disable_commit_resumed () | |
2915 | { | |
2916 | reset (); | |
2917 | } | |
2918 | ||
2919 | /* See infrun.h. */ | |
2920 | ||
2921 | void | |
2922 | scoped_disable_commit_resumed::reset_and_commit () | |
2923 | { | |
2924 | reset (); | |
2925 | maybe_call_commit_resumed_all_targets (); | |
2926 | } | |
2927 | ||
2928 | /* See infrun.h. */ | |
2929 | ||
2930 | scoped_enable_commit_resumed::scoped_enable_commit_resumed | |
2931 | (const char *reason) | |
2932 | : m_reason (reason), | |
2933 | m_prev_enable_commit_resumed (enable_commit_resumed) | |
2934 | { | |
2935 | infrun_debug_printf ("reason=%s", m_reason); | |
2936 | ||
2937 | if (!enable_commit_resumed) | |
2938 | { | |
2939 | enable_commit_resumed = true; | |
2940 | ||
2941 | /* Re-enable COMMIT_RESUMED_STATE on the targets where it's | |
2942 | possible. */ | |
2943 | maybe_set_commit_resumed_all_targets (); | |
2944 | ||
2945 | maybe_call_commit_resumed_all_targets (); | |
2946 | } | |
2947 | } | |
2948 | ||
2949 | /* See infrun.h. */ | |
2950 | ||
2951 | scoped_enable_commit_resumed::~scoped_enable_commit_resumed () | |
2952 | { | |
2953 | infrun_debug_printf ("reason=%s", m_reason); | |
2954 | ||
2955 | gdb_assert (enable_commit_resumed); | |
2956 | ||
2957 | enable_commit_resumed = m_prev_enable_commit_resumed; | |
2958 | ||
2959 | if (!enable_commit_resumed) | |
2960 | { | |
2961 | /* Force all COMMIT_RESUMED_STATE back to false. */ | |
2962 | for (inferior *inf : all_non_exited_inferiors ()) | |
2963 | { | |
2964 | process_stratum_target *proc_target = inf->process_target (); | |
2965 | proc_target->commit_resumed_state = false; | |
2966 | } | |
5b6d1e4f PA |
2967 | } |
2968 | } | |
2969 | ||
2f4fcf00 PA |
2970 | /* Check that all the targets we're about to resume are in non-stop |
2971 | mode. Ideally, we'd only care whether all targets support | |
2972 | target-async, but we're not there yet. E.g., stop_all_threads | |
2973 | doesn't know how to handle all-stop targets. Also, the remote | |
2974 | protocol in all-stop mode is synchronous, irrespective of | |
2975 | target-async, which means that things like a breakpoint re-set | |
2976 | triggered by one target would try to read memory from all targets | |
2977 | and fail. */ | |
2978 | ||
2979 | static void | |
2980 | check_multi_target_resumption (process_stratum_target *resume_target) | |
2981 | { | |
2982 | if (!non_stop && resume_target == nullptr) | |
2983 | { | |
2984 | scoped_restore_current_thread restore_thread; | |
2985 | ||
2986 | /* This is used to track whether we're resuming more than one | |
2987 | target. */ | |
2988 | process_stratum_target *first_connection = nullptr; | |
2989 | ||
2990 | /* The first inferior we see with a target that does not work in | |
2991 | always-non-stop mode. */ | |
2992 | inferior *first_not_non_stop = nullptr; | |
2993 | ||
f058c521 | 2994 | for (inferior *inf : all_non_exited_inferiors ()) |
2f4fcf00 PA |
2995 | { |
2996 | switch_to_inferior_no_thread (inf); | |
2997 | ||
55f6301a | 2998 | if (!target_has_execution ()) |
2f4fcf00 PA |
2999 | continue; |
3000 | ||
3001 | process_stratum_target *proc_target | |
3002 | = current_inferior ()->process_target(); | |
3003 | ||
3004 | if (!target_is_non_stop_p ()) | |
3005 | first_not_non_stop = inf; | |
3006 | ||
3007 | if (first_connection == nullptr) | |
3008 | first_connection = proc_target; | |
3009 | else if (first_connection != proc_target | |
3010 | && first_not_non_stop != nullptr) | |
3011 | { | |
3012 | switch_to_inferior_no_thread (first_not_non_stop); | |
3013 | ||
3014 | proc_target = current_inferior ()->process_target(); | |
3015 | ||
3016 | error (_("Connection %d (%s) does not support " | |
3017 | "multi-target resumption."), | |
3018 | proc_target->connection_number, | |
3019 | make_target_connection_string (proc_target).c_str ()); | |
3020 | } | |
3021 | } | |
3022 | } | |
3023 | } | |
3024 | ||
c906108c SS |
3025 | /* Basic routine for continuing the program in various fashions. |
3026 | ||
3027 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
3028 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
3029 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
3030 | |
3031 | You should call clear_proceed_status before calling proceed. */ | |
3032 | ||
3033 | void | |
64ce06e4 | 3034 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 3035 | { |
3ec3145c SM |
3036 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
3037 | ||
e58b0e63 PA |
3038 | struct regcache *regcache; |
3039 | struct gdbarch *gdbarch; | |
e58b0e63 | 3040 | CORE_ADDR pc; |
4d9d9d04 PA |
3041 | struct execution_control_state ecss; |
3042 | struct execution_control_state *ecs = &ecss; | |
c4464ade | 3043 | bool started; |
c906108c | 3044 | |
e58b0e63 PA |
3045 | /* If we're stopped at a fork/vfork, follow the branch set by the |
3046 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
3047 | resuming the current thread. */ | |
3048 | if (!follow_fork ()) | |
3049 | { | |
3050 | /* The target for some reason decided not to resume. */ | |
3051 | normal_stop (); | |
f148b27e | 3052 | if (target_can_async_p ()) |
b1a35af2 | 3053 | inferior_event_handler (INF_EXEC_COMPLETE); |
e58b0e63 PA |
3054 | return; |
3055 | } | |
3056 | ||
842951eb PA |
3057 | /* We'll update this if & when we switch to a new thread. */ |
3058 | previous_inferior_ptid = inferior_ptid; | |
3059 | ||
e58b0e63 | 3060 | regcache = get_current_regcache (); |
ac7936df | 3061 | gdbarch = regcache->arch (); |
8b86c959 YQ |
3062 | const address_space *aspace = regcache->aspace (); |
3063 | ||
fc75c28b TBA |
3064 | pc = regcache_read_pc_protected (regcache); |
3065 | ||
08036331 | 3066 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 3067 | |
99619bea | 3068 | /* Fill in with reasonable starting values. */ |
08036331 | 3069 | init_thread_stepping_state (cur_thr); |
99619bea | 3070 | |
08036331 | 3071 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 3072 | |
5b6d1e4f PA |
3073 | ptid_t resume_ptid |
3074 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
3075 | process_stratum_target *resume_target | |
3076 | = user_visible_resume_target (resume_ptid); | |
3077 | ||
2f4fcf00 PA |
3078 | check_multi_target_resumption (resume_target); |
3079 | ||
2acceee2 | 3080 | if (addr == (CORE_ADDR) -1) |
c906108c | 3081 | { |
1edb66d8 | 3082 | if (pc == cur_thr->stop_pc () |
af48d08f | 3083 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 3084 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
3085 | /* There is a breakpoint at the address we will resume at, |
3086 | step one instruction before inserting breakpoints so that | |
3087 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
3088 | breakpoint). |
3089 | ||
3090 | Note, we don't do this in reverse, because we won't | |
3091 | actually be executing the breakpoint insn anyway. | |
3092 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 3093 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
3094 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3095 | && gdbarch_single_step_through_delay (gdbarch, | |
3096 | get_current_frame ())) | |
3352ef37 AC |
3097 | /* We stepped onto an instruction that needs to be stepped |
3098 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 3099 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
3100 | } |
3101 | else | |
3102 | { | |
515630c5 | 3103 | regcache_write_pc (regcache, addr); |
c906108c SS |
3104 | } |
3105 | ||
70509625 | 3106 | if (siggnal != GDB_SIGNAL_DEFAULT) |
1edb66d8 | 3107 | cur_thr->set_stop_signal (siggnal); |
70509625 | 3108 | |
4d9d9d04 PA |
3109 | /* If an exception is thrown from this point on, make sure to |
3110 | propagate GDB's knowledge of the executing state to the | |
3111 | frontend/user running state. */ | |
5b6d1e4f | 3112 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
3113 | |
3114 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3115 | threads (e.g., we might need to set threads stepping over | |
3116 | breakpoints first), from the user/frontend's point of view, all | |
3117 | threads in RESUME_PTID are now running. Unless we're calling an | |
3118 | inferior function, as in that case we pretend the inferior | |
3119 | doesn't run at all. */ | |
08036331 | 3120 | if (!cur_thr->control.in_infcall) |
719546c4 | 3121 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3122 | |
1eb8556f SM |
3123 | infrun_debug_printf ("addr=%s, signal=%s", paddress (gdbarch, addr), |
3124 | gdb_signal_to_symbol_string (siggnal)); | |
527159b7 | 3125 | |
4d9d9d04 PA |
3126 | annotate_starting (); |
3127 | ||
3128 | /* Make sure that output from GDB appears before output from the | |
3129 | inferior. */ | |
3130 | gdb_flush (gdb_stdout); | |
3131 | ||
d930703d PA |
3132 | /* Since we've marked the inferior running, give it the terminal. A |
3133 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3134 | still detect attempts to unblock a stuck connection with repeated | |
3135 | Ctrl-C from within target_pass_ctrlc). */ | |
3136 | target_terminal::inferior (); | |
3137 | ||
4d9d9d04 PA |
3138 | /* In a multi-threaded task we may select another thread and |
3139 | then continue or step. | |
3140 | ||
3141 | But if a thread that we're resuming had stopped at a breakpoint, | |
3142 | it will immediately cause another breakpoint stop without any | |
3143 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3144 | we must step over it first. | |
3145 | ||
3146 | Look for threads other than the current (TP) that reported a | |
3147 | breakpoint hit and haven't been resumed yet since. */ | |
3148 | ||
3149 | /* If scheduler locking applies, we can avoid iterating over all | |
3150 | threads. */ | |
08036331 | 3151 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3152 | { |
5b6d1e4f PA |
3153 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3154 | resume_ptid)) | |
08036331 | 3155 | { |
f3f8ece4 PA |
3156 | switch_to_thread_no_regs (tp); |
3157 | ||
4d9d9d04 PA |
3158 | /* Ignore the current thread here. It's handled |
3159 | afterwards. */ | |
08036331 | 3160 | if (tp == cur_thr) |
4d9d9d04 | 3161 | continue; |
c906108c | 3162 | |
4d9d9d04 PA |
3163 | if (!thread_still_needs_step_over (tp)) |
3164 | continue; | |
3165 | ||
3166 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3167 | |
1eb8556f SM |
3168 | infrun_debug_printf ("need to step-over [%s] first", |
3169 | target_pid_to_str (tp->ptid).c_str ()); | |
99619bea | 3170 | |
28d5518b | 3171 | global_thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3172 | } |
f3f8ece4 PA |
3173 | |
3174 | switch_to_thread (cur_thr); | |
30852783 UW |
3175 | } |
3176 | ||
4d9d9d04 PA |
3177 | /* Enqueue the current thread last, so that we move all other |
3178 | threads over their breakpoints first. */ | |
08036331 | 3179 | if (cur_thr->stepping_over_breakpoint) |
28d5518b | 3180 | global_thread_step_over_chain_enqueue (cur_thr); |
30852783 | 3181 | |
4d9d9d04 PA |
3182 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3183 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3184 | advanced. Must do this before resuming any thread, as in | |
3185 | all-stop/remote, once we resume we can't send any other packet | |
3186 | until the target stops again. */ | |
fc75c28b | 3187 | cur_thr->prev_pc = regcache_read_pc_protected (regcache); |
99619bea | 3188 | |
a9bc57b9 | 3189 | { |
1192f124 | 3190 | scoped_disable_commit_resumed disable_commit_resumed ("proceeding"); |
85ad3aaf | 3191 | |
a9bc57b9 | 3192 | started = start_step_over (); |
c906108c | 3193 | |
a9bc57b9 TT |
3194 | if (step_over_info_valid_p ()) |
3195 | { | |
3196 | /* Either this thread started a new in-line step over, or some | |
3197 | other thread was already doing one. In either case, don't | |
3198 | resume anything else until the step-over is finished. */ | |
3199 | } | |
3200 | else if (started && !target_is_non_stop_p ()) | |
3201 | { | |
3202 | /* A new displaced stepping sequence was started. In all-stop, | |
3203 | we can't talk to the target anymore until it next stops. */ | |
3204 | } | |
3205 | else if (!non_stop && target_is_non_stop_p ()) | |
3206 | { | |
3ec3145c SM |
3207 | INFRUN_SCOPED_DEBUG_START_END |
3208 | ("resuming threads, all-stop-on-top-of-non-stop"); | |
3209 | ||
a9bc57b9 TT |
3210 | /* In all-stop, but the target is always in non-stop mode. |
3211 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3212 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3213 | resume_ptid)) | |
3214 | { | |
3215 | switch_to_thread_no_regs (tp); | |
3216 | ||
f9fac3c8 SM |
3217 | if (!tp->inf->has_execution ()) |
3218 | { | |
1eb8556f SM |
3219 | infrun_debug_printf ("[%s] target has no execution", |
3220 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3221 | continue; |
3222 | } | |
f3f8ece4 | 3223 | |
7846f3aa | 3224 | if (tp->resumed ()) |
f9fac3c8 | 3225 | { |
1eb8556f SM |
3226 | infrun_debug_printf ("[%s] resumed", |
3227 | target_pid_to_str (tp->ptid).c_str ()); | |
1edb66d8 | 3228 | gdb_assert (tp->executing || tp->has_pending_waitstatus ()); |
f9fac3c8 SM |
3229 | continue; |
3230 | } | |
fbea99ea | 3231 | |
f9fac3c8 SM |
3232 | if (thread_is_in_step_over_chain (tp)) |
3233 | { | |
1eb8556f SM |
3234 | infrun_debug_printf ("[%s] needs step-over", |
3235 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3236 | continue; |
3237 | } | |
fbea99ea | 3238 | |
1eb8556f | 3239 | infrun_debug_printf ("resuming %s", |
dda83cd7 | 3240 | target_pid_to_str (tp->ptid).c_str ()); |
fbea99ea | 3241 | |
f9fac3c8 SM |
3242 | reset_ecs (ecs, tp); |
3243 | switch_to_thread (tp); | |
3244 | keep_going_pass_signal (ecs); | |
3245 | if (!ecs->wait_some_more) | |
3246 | error (_("Command aborted.")); | |
3247 | } | |
a9bc57b9 | 3248 | } |
7846f3aa | 3249 | else if (!cur_thr->resumed () && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3250 | { |
3251 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3252 | reset_ecs (ecs, cur_thr); |
3253 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3254 | keep_going_pass_signal (ecs); |
3255 | if (!ecs->wait_some_more) | |
3256 | error (_("Command aborted.")); | |
3257 | } | |
c906108c | 3258 | |
1192f124 SM |
3259 | disable_commit_resumed.reset_and_commit (); |
3260 | } | |
85ad3aaf | 3261 | |
731f534f | 3262 | finish_state.release (); |
c906108c | 3263 | |
873657b9 PA |
3264 | /* If we've switched threads above, switch back to the previously |
3265 | current thread. We don't want the user to see a different | |
3266 | selected thread. */ | |
3267 | switch_to_thread (cur_thr); | |
3268 | ||
0b333c5e PA |
3269 | /* Tell the event loop to wait for it to stop. If the target |
3270 | supports asynchronous execution, it'll do this from within | |
3271 | target_resume. */ | |
362646f5 | 3272 | if (!target_can_async_p ()) |
0b333c5e | 3273 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3274 | } |
c906108c SS |
3275 | \f |
3276 | ||
3277 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3278 | |
c906108c | 3279 | void |
8621d6a9 | 3280 | start_remote (int from_tty) |
c906108c | 3281 | { |
5b6d1e4f PA |
3282 | inferior *inf = current_inferior (); |
3283 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3284 | |
1777feb0 | 3285 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3286 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3287 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3288 | nothing is returned (instead of just blocking). Because of this, |
3289 | targets expecting an immediate response need to, internally, set | |
3290 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3291 | timeout. */ |
6426a772 JM |
3292 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3293 | differentiate to its caller what the state of the target is after | |
3294 | the initial open has been performed. Here we're assuming that | |
3295 | the target has stopped. It should be possible to eventually have | |
3296 | target_open() return to the caller an indication that the target | |
3297 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3298 | for an async run. */ |
5b6d1e4f | 3299 | wait_for_inferior (inf); |
8621d6a9 DJ |
3300 | |
3301 | /* Now that the inferior has stopped, do any bookkeeping like | |
3302 | loading shared libraries. We want to do this before normal_stop, | |
3303 | so that the displayed frame is up to date. */ | |
a7aba266 | 3304 | post_create_inferior (from_tty); |
8621d6a9 | 3305 | |
6426a772 | 3306 | normal_stop (); |
c906108c SS |
3307 | } |
3308 | ||
3309 | /* Initialize static vars when a new inferior begins. */ | |
3310 | ||
3311 | void | |
96baa820 | 3312 | init_wait_for_inferior (void) |
c906108c SS |
3313 | { |
3314 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3315 | |
c906108c SS |
3316 | breakpoint_init_inferior (inf_starting); |
3317 | ||
70509625 | 3318 | clear_proceed_status (0); |
9f976b41 | 3319 | |
ab1ddbcf | 3320 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3321 | |
842951eb | 3322 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3323 | } |
237fc4c9 | 3324 | |
c906108c | 3325 | \f |
488f131b | 3326 | |
ec9499be | 3327 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3328 | |
568d6575 UW |
3329 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3330 | struct execution_control_state *ecs); | |
3331 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3332 | struct execution_control_state *ecs); | |
4f5d7f63 | 3333 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3334 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3335 | struct frame_info *); |
611c83ae | 3336 | |
bdc36728 | 3337 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3338 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3339 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3340 | static void process_event_stop_test (struct execution_control_state *ecs); |
c4464ade | 3341 | static bool switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3342 | |
252fbfc8 PA |
3343 | /* This function is attached as a "thread_stop_requested" observer. |
3344 | Cleanup local state that assumed the PTID was to be resumed, and | |
3345 | report the stop to the frontend. */ | |
3346 | ||
2c0b251b | 3347 | static void |
252fbfc8 PA |
3348 | infrun_thread_stop_requested (ptid_t ptid) |
3349 | { | |
5b6d1e4f PA |
3350 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3351 | ||
c65d6b55 PA |
3352 | /* PTID was requested to stop. If the thread was already stopped, |
3353 | but the user/frontend doesn't know about that yet (e.g., the | |
3354 | thread had been temporarily paused for some step-over), set up | |
3355 | for reporting the stop now. */ | |
5b6d1e4f | 3356 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3357 | { |
3358 | if (tp->state != THREAD_RUNNING) | |
3359 | continue; | |
3360 | if (tp->executing) | |
3361 | continue; | |
c65d6b55 | 3362 | |
08036331 PA |
3363 | /* Remove matching threads from the step-over queue, so |
3364 | start_step_over doesn't try to resume them | |
3365 | automatically. */ | |
3366 | if (thread_is_in_step_over_chain (tp)) | |
28d5518b | 3367 | global_thread_step_over_chain_remove (tp); |
c65d6b55 | 3368 | |
08036331 PA |
3369 | /* If the thread is stopped, but the user/frontend doesn't |
3370 | know about that yet, queue a pending event, as if the | |
3371 | thread had just stopped now. Unless the thread already had | |
3372 | a pending event. */ | |
1edb66d8 | 3373 | if (!tp->has_pending_waitstatus ()) |
08036331 | 3374 | { |
1edb66d8 SM |
3375 | target_waitstatus ws; |
3376 | ws.kind = TARGET_WAITKIND_STOPPED; | |
3377 | ws.value.sig = GDB_SIGNAL_0; | |
3378 | tp->set_pending_waitstatus (ws); | |
08036331 | 3379 | } |
c65d6b55 | 3380 | |
08036331 PA |
3381 | /* Clear the inline-frame state, since we're re-processing the |
3382 | stop. */ | |
5b6d1e4f | 3383 | clear_inline_frame_state (tp); |
c65d6b55 | 3384 | |
08036331 PA |
3385 | /* If this thread was paused because some other thread was |
3386 | doing an inline-step over, let that finish first. Once | |
3387 | that happens, we'll restart all threads and consume pending | |
3388 | stop events then. */ | |
3389 | if (step_over_info_valid_p ()) | |
3390 | continue; | |
3391 | ||
3392 | /* Otherwise we can process the (new) pending event now. Set | |
3393 | it so this pending event is considered by | |
3394 | do_target_wait. */ | |
7846f3aa | 3395 | tp->set_resumed (true); |
08036331 | 3396 | } |
252fbfc8 PA |
3397 | } |
3398 | ||
a07daef3 PA |
3399 | static void |
3400 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3401 | { | |
5b6d1e4f PA |
3402 | if (target_last_proc_target == tp->inf->process_target () |
3403 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3404 | nullify_last_target_wait_ptid (); |
3405 | } | |
3406 | ||
0cbcdb96 PA |
3407 | /* Delete the step resume, single-step and longjmp/exception resume |
3408 | breakpoints of TP. */ | |
4e1c45ea | 3409 | |
0cbcdb96 PA |
3410 | static void |
3411 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3412 | { |
0cbcdb96 PA |
3413 | delete_step_resume_breakpoint (tp); |
3414 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3415 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3416 | } |
3417 | ||
0cbcdb96 PA |
3418 | /* If the target still has execution, call FUNC for each thread that |
3419 | just stopped. In all-stop, that's all the non-exited threads; in | |
3420 | non-stop, that's the current thread, only. */ | |
3421 | ||
3422 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3423 | (struct thread_info *tp); | |
4e1c45ea PA |
3424 | |
3425 | static void | |
0cbcdb96 | 3426 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3427 | { |
55f6301a | 3428 | if (!target_has_execution () || inferior_ptid == null_ptid) |
4e1c45ea PA |
3429 | return; |
3430 | ||
fbea99ea | 3431 | if (target_is_non_stop_p ()) |
4e1c45ea | 3432 | { |
0cbcdb96 PA |
3433 | /* If in non-stop mode, only the current thread stopped. */ |
3434 | func (inferior_thread ()); | |
4e1c45ea PA |
3435 | } |
3436 | else | |
0cbcdb96 | 3437 | { |
0cbcdb96 | 3438 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3439 | for (thread_info *tp : all_non_exited_threads ()) |
3440 | func (tp); | |
0cbcdb96 PA |
3441 | } |
3442 | } | |
3443 | ||
3444 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3445 | the threads that just stopped. */ | |
3446 | ||
3447 | static void | |
3448 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3449 | { | |
3450 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3451 | } |
3452 | ||
3453 | /* Delete the single-step breakpoints of the threads that just | |
3454 | stopped. */ | |
7c16b83e | 3455 | |
34b7e8a6 PA |
3456 | static void |
3457 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3458 | { | |
3459 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3460 | } |
3461 | ||
221e1a37 | 3462 | /* See infrun.h. */ |
223698f8 | 3463 | |
221e1a37 | 3464 | void |
223698f8 DE |
3465 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3466 | const struct target_waitstatus *ws) | |
3467 | { | |
e71daf80 SM |
3468 | infrun_debug_printf ("target_wait (%d.%ld.%ld [%s], status) =", |
3469 | waiton_ptid.pid (), | |
3470 | waiton_ptid.lwp (), | |
3471 | waiton_ptid.tid (), | |
3472 | target_pid_to_str (waiton_ptid).c_str ()); | |
3473 | infrun_debug_printf (" %d.%ld.%ld [%s],", | |
3474 | result_ptid.pid (), | |
3475 | result_ptid.lwp (), | |
3476 | result_ptid.tid (), | |
3477 | target_pid_to_str (result_ptid).c_str ()); | |
3478 | infrun_debug_printf (" %s", target_waitstatus_to_string (ws).c_str ()); | |
223698f8 DE |
3479 | } |
3480 | ||
372316f1 PA |
3481 | /* Select a thread at random, out of those which are resumed and have |
3482 | had events. */ | |
3483 | ||
3484 | static struct thread_info * | |
5b6d1e4f | 3485 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3486 | { |
71a23490 SM |
3487 | process_stratum_target *proc_target = inf->process_target (); |
3488 | thread_info *thread | |
3489 | = proc_target->random_resumed_with_pending_wait_status (inf, waiton_ptid); | |
08036331 | 3490 | |
71a23490 | 3491 | if (thread == nullptr) |
08036331 | 3492 | { |
71a23490 SM |
3493 | infrun_debug_printf ("None found."); |
3494 | return nullptr; | |
3495 | } | |
372316f1 | 3496 | |
71a23490 SM |
3497 | infrun_debug_printf ("Found %s.", target_pid_to_str (thread->ptid).c_str ()); |
3498 | gdb_assert (thread->resumed ()); | |
3499 | gdb_assert (thread->has_pending_waitstatus ()); | |
372316f1 | 3500 | |
71a23490 | 3501 | return thread; |
372316f1 PA |
3502 | } |
3503 | ||
3504 | /* Wrapper for target_wait that first checks whether threads have | |
3505 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3506 | more events. INF is the inferior we're using to call target_wait |
3507 | on. */ | |
372316f1 PA |
3508 | |
3509 | static ptid_t | |
5b6d1e4f | 3510 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
b60cea74 | 3511 | target_waitstatus *status, target_wait_flags options) |
372316f1 PA |
3512 | { |
3513 | ptid_t event_ptid; | |
3514 | struct thread_info *tp; | |
3515 | ||
24ed6739 AB |
3516 | /* We know that we are looking for an event in the target of inferior |
3517 | INF, but we don't know which thread the event might come from. As | |
3518 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3519 | the wait code relies on it - doing so is always a mistake. */ | |
3520 | switch_to_inferior_no_thread (inf); | |
3521 | ||
372316f1 PA |
3522 | /* First check if there is a resumed thread with a wait status |
3523 | pending. */ | |
d7e15655 | 3524 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3525 | { |
5b6d1e4f | 3526 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3527 | } |
3528 | else | |
3529 | { | |
1eb8556f SM |
3530 | infrun_debug_printf ("Waiting for specific thread %s.", |
3531 | target_pid_to_str (ptid).c_str ()); | |
372316f1 PA |
3532 | |
3533 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3534 | tp = find_thread_ptid (inf, ptid); |
372316f1 | 3535 | gdb_assert (tp != NULL); |
1edb66d8 | 3536 | if (!tp->has_pending_waitstatus ()) |
372316f1 PA |
3537 | tp = NULL; |
3538 | } | |
3539 | ||
3540 | if (tp != NULL | |
1edb66d8 SM |
3541 | && (tp->stop_reason () == TARGET_STOPPED_BY_SW_BREAKPOINT |
3542 | || tp->stop_reason () == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
372316f1 | 3543 | { |
00431a78 | 3544 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3545 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3546 | CORE_ADDR pc; |
3547 | int discard = 0; | |
3548 | ||
3549 | pc = regcache_read_pc (regcache); | |
3550 | ||
1edb66d8 | 3551 | if (pc != tp->stop_pc ()) |
372316f1 | 3552 | { |
1eb8556f SM |
3553 | infrun_debug_printf ("PC of %s changed. was=%s, now=%s", |
3554 | target_pid_to_str (tp->ptid).c_str (), | |
1edb66d8 | 3555 | paddress (gdbarch, tp->stop_pc ()), |
1eb8556f | 3556 | paddress (gdbarch, pc)); |
372316f1 PA |
3557 | discard = 1; |
3558 | } | |
a01bda52 | 3559 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 | 3560 | { |
1eb8556f SM |
3561 | infrun_debug_printf ("previous breakpoint of %s, at %s gone", |
3562 | target_pid_to_str (tp->ptid).c_str (), | |
3563 | paddress (gdbarch, pc)); | |
372316f1 PA |
3564 | |
3565 | discard = 1; | |
3566 | } | |
3567 | ||
3568 | if (discard) | |
3569 | { | |
1eb8556f SM |
3570 | infrun_debug_printf ("pending event of %s cancelled.", |
3571 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 3572 | |
1edb66d8 SM |
3573 | tp->clear_pending_waitstatus (); |
3574 | target_waitstatus ws; | |
3575 | ws.kind = TARGET_WAITKIND_SPURIOUS; | |
3576 | tp->set_pending_waitstatus (ws); | |
3577 | tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON); | |
372316f1 PA |
3578 | } |
3579 | } | |
3580 | ||
3581 | if (tp != NULL) | |
3582 | { | |
1eb8556f SM |
3583 | infrun_debug_printf ("Using pending wait status %s for %s.", |
3584 | target_waitstatus_to_string | |
1edb66d8 | 3585 | (&tp->pending_waitstatus ()).c_str (), |
1eb8556f | 3586 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
3587 | |
3588 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3589 | if it was a software breakpoint (and the target doesn't | |
3590 | always adjust the PC itself). */ | |
1edb66d8 | 3591 | if (tp->stop_reason () == TARGET_STOPPED_BY_SW_BREAKPOINT |
372316f1 PA |
3592 | && !target_supports_stopped_by_sw_breakpoint ()) |
3593 | { | |
3594 | struct regcache *regcache; | |
3595 | struct gdbarch *gdbarch; | |
3596 | int decr_pc; | |
3597 | ||
00431a78 | 3598 | regcache = get_thread_regcache (tp); |
ac7936df | 3599 | gdbarch = regcache->arch (); |
372316f1 PA |
3600 | |
3601 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3602 | if (decr_pc != 0) | |
3603 | { | |
3604 | CORE_ADDR pc; | |
3605 | ||
3606 | pc = regcache_read_pc (regcache); | |
3607 | regcache_write_pc (regcache, pc + decr_pc); | |
3608 | } | |
3609 | } | |
3610 | ||
1edb66d8 SM |
3611 | tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON); |
3612 | *status = tp->pending_waitstatus (); | |
3613 | tp->clear_pending_waitstatus (); | |
372316f1 PA |
3614 | |
3615 | /* Wake up the event loop again, until all pending events are | |
3616 | processed. */ | |
3617 | if (target_is_async_p ()) | |
3618 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3619 | return tp->ptid; | |
3620 | } | |
3621 | ||
3622 | /* But if we don't find one, we'll have to wait. */ | |
3623 | ||
d3a07122 SM |
3624 | /* We can't ask a non-async target to do a non-blocking wait, so this will be |
3625 | a blocking wait. */ | |
3626 | if (!target_can_async_p ()) | |
3627 | options &= ~TARGET_WNOHANG; | |
3628 | ||
372316f1 PA |
3629 | if (deprecated_target_wait_hook) |
3630 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3631 | else | |
3632 | event_ptid = target_wait (ptid, status, options); | |
3633 | ||
3634 | return event_ptid; | |
3635 | } | |
3636 | ||
5b6d1e4f PA |
3637 | /* Wrapper for target_wait that first checks whether threads have |
3638 | pending statuses to report before actually asking the target for | |
b3e3a4c1 | 3639 | more events. Polls for events from all inferiors/targets. */ |
5b6d1e4f PA |
3640 | |
3641 | static bool | |
ac0d67ed | 3642 | do_target_wait (execution_control_state *ecs, target_wait_flags options) |
5b6d1e4f PA |
3643 | { |
3644 | int num_inferiors = 0; | |
3645 | int random_selector; | |
3646 | ||
b3e3a4c1 SM |
3647 | /* For fairness, we pick the first inferior/target to poll at random |
3648 | out of all inferiors that may report events, and then continue | |
3649 | polling the rest of the inferior list starting from that one in a | |
3650 | circular fashion until the whole list is polled once. */ | |
5b6d1e4f | 3651 | |
ac0d67ed | 3652 | auto inferior_matches = [] (inferior *inf) |
5b6d1e4f | 3653 | { |
ac0d67ed | 3654 | return inf->process_target () != nullptr; |
5b6d1e4f PA |
3655 | }; |
3656 | ||
b3e3a4c1 | 3657 | /* First see how many matching inferiors we have. */ |
5b6d1e4f PA |
3658 | for (inferior *inf : all_inferiors ()) |
3659 | if (inferior_matches (inf)) | |
3660 | num_inferiors++; | |
3661 | ||
3662 | if (num_inferiors == 0) | |
3663 | { | |
3664 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3665 | return false; | |
3666 | } | |
3667 | ||
b3e3a4c1 | 3668 | /* Now randomly pick an inferior out of those that matched. */ |
5b6d1e4f PA |
3669 | random_selector = (int) |
3670 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3671 | ||
1eb8556f SM |
3672 | if (num_inferiors > 1) |
3673 | infrun_debug_printf ("Found %d inferiors, starting at #%d", | |
3674 | num_inferiors, random_selector); | |
5b6d1e4f | 3675 | |
b3e3a4c1 | 3676 | /* Select the Nth inferior that matched. */ |
5b6d1e4f PA |
3677 | |
3678 | inferior *selected = nullptr; | |
3679 | ||
3680 | for (inferior *inf : all_inferiors ()) | |
3681 | if (inferior_matches (inf)) | |
3682 | if (random_selector-- == 0) | |
3683 | { | |
3684 | selected = inf; | |
3685 | break; | |
3686 | } | |
3687 | ||
b3e3a4c1 | 3688 | /* Now poll for events out of each of the matching inferior's |
5b6d1e4f PA |
3689 | targets, starting from the selected one. */ |
3690 | ||
3691 | auto do_wait = [&] (inferior *inf) | |
3692 | { | |
ac0d67ed | 3693 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, options); |
5b6d1e4f PA |
3694 | ecs->target = inf->process_target (); |
3695 | return (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3696 | }; | |
3697 | ||
b3e3a4c1 SM |
3698 | /* Needed in 'all-stop + target-non-stop' mode, because we end up |
3699 | here spuriously after the target is all stopped and we've already | |
5b6d1e4f PA |
3700 | reported the stop to the user, polling for events. */ |
3701 | scoped_restore_current_thread restore_thread; | |
3702 | ||
08bdefb5 PA |
3703 | intrusive_list_iterator<inferior> start |
3704 | = inferior_list.iterator_to (*selected); | |
3705 | ||
3706 | for (intrusive_list_iterator<inferior> it = start; | |
3707 | it != inferior_list.end (); | |
3708 | ++it) | |
3709 | { | |
3710 | inferior *inf = &*it; | |
3711 | ||
3712 | if (inferior_matches (inf) && do_wait (inf)) | |
5b6d1e4f | 3713 | return true; |
08bdefb5 | 3714 | } |
5b6d1e4f | 3715 | |
08bdefb5 PA |
3716 | for (intrusive_list_iterator<inferior> it = inferior_list.begin (); |
3717 | it != start; | |
3718 | ++it) | |
3719 | { | |
3720 | inferior *inf = &*it; | |
3721 | ||
3722 | if (inferior_matches (inf) && do_wait (inf)) | |
5b6d1e4f | 3723 | return true; |
08bdefb5 | 3724 | } |
5b6d1e4f PA |
3725 | |
3726 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3727 | return false; | |
3728 | } | |
3729 | ||
8ff53139 PA |
3730 | /* An event reported by wait_one. */ |
3731 | ||
3732 | struct wait_one_event | |
3733 | { | |
3734 | /* The target the event came out of. */ | |
3735 | process_stratum_target *target; | |
3736 | ||
3737 | /* The PTID the event was for. */ | |
3738 | ptid_t ptid; | |
3739 | ||
3740 | /* The waitstatus. */ | |
3741 | target_waitstatus ws; | |
3742 | }; | |
3743 | ||
3744 | static bool handle_one (const wait_one_event &event); | |
ac7d717c | 3745 | static void restart_threads (struct thread_info *event_thread); |
8ff53139 | 3746 | |
24291992 PA |
3747 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3748 | detaching while a thread is displaced stepping is a recipe for | |
3749 | crashing it, as nothing would readjust the PC out of the scratch | |
3750 | pad. */ | |
3751 | ||
3752 | void | |
3753 | prepare_for_detach (void) | |
3754 | { | |
3755 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3756 | ptid_t pid_ptid = ptid_t (inf->pid); |
8ff53139 | 3757 | scoped_restore_current_thread restore_thread; |
24291992 | 3758 | |
9bcb1f16 | 3759 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3760 | |
8ff53139 PA |
3761 | /* Remove all threads of INF from the global step-over chain. We |
3762 | want to stop any ongoing step-over, not start any new one. */ | |
8b6a69b2 SM |
3763 | thread_step_over_list_safe_range range |
3764 | = make_thread_step_over_list_safe_range (global_thread_step_over_list); | |
3765 | ||
3766 | for (thread_info *tp : range) | |
3767 | if (tp->inf == inf) | |
3768 | { | |
3769 | infrun_debug_printf ("removing thread %s from global step over chain", | |
3770 | target_pid_to_str (tp->ptid).c_str ()); | |
8ff53139 | 3771 | global_thread_step_over_chain_remove (tp); |
8b6a69b2 | 3772 | } |
24291992 | 3773 | |
ac7d717c PA |
3774 | /* If we were already in the middle of an inline step-over, and the |
3775 | thread stepping belongs to the inferior we're detaching, we need | |
3776 | to restart the threads of other inferiors. */ | |
3777 | if (step_over_info.thread != -1) | |
3778 | { | |
3779 | infrun_debug_printf ("inline step-over in-process while detaching"); | |
3780 | ||
3781 | thread_info *thr = find_thread_global_id (step_over_info.thread); | |
3782 | if (thr->inf == inf) | |
3783 | { | |
3784 | /* Since we removed threads of INF from the step-over chain, | |
3785 | we know this won't start a step-over for INF. */ | |
3786 | clear_step_over_info (); | |
3787 | ||
3788 | if (target_is_non_stop_p ()) | |
3789 | { | |
3790 | /* Start a new step-over in another thread if there's | |
3791 | one that needs it. */ | |
3792 | start_step_over (); | |
3793 | ||
3794 | /* Restart all other threads (except the | |
3795 | previously-stepping thread, since that one is still | |
3796 | running). */ | |
3797 | if (!step_over_info_valid_p ()) | |
3798 | restart_threads (thr); | |
3799 | } | |
3800 | } | |
3801 | } | |
3802 | ||
8ff53139 PA |
3803 | if (displaced_step_in_progress (inf)) |
3804 | { | |
3805 | infrun_debug_printf ("displaced-stepping in-process while detaching"); | |
24291992 | 3806 | |
8ff53139 | 3807 | /* Stop threads currently displaced stepping, aborting it. */ |
24291992 | 3808 | |
8ff53139 PA |
3809 | for (thread_info *thr : inf->non_exited_threads ()) |
3810 | { | |
3811 | if (thr->displaced_step_state.in_progress ()) | |
3812 | { | |
3813 | if (thr->executing) | |
3814 | { | |
3815 | if (!thr->stop_requested) | |
3816 | { | |
3817 | target_stop (thr->ptid); | |
3818 | thr->stop_requested = true; | |
3819 | } | |
3820 | } | |
3821 | else | |
7846f3aa | 3822 | thr->set_resumed (false); |
8ff53139 PA |
3823 | } |
3824 | } | |
24291992 | 3825 | |
8ff53139 PA |
3826 | while (displaced_step_in_progress (inf)) |
3827 | { | |
3828 | wait_one_event event; | |
24291992 | 3829 | |
8ff53139 PA |
3830 | event.target = inf->process_target (); |
3831 | event.ptid = do_target_wait_1 (inf, pid_ptid, &event.ws, 0); | |
24291992 | 3832 | |
8ff53139 PA |
3833 | if (debug_infrun) |
3834 | print_target_wait_results (pid_ptid, event.ptid, &event.ws); | |
24291992 | 3835 | |
8ff53139 PA |
3836 | handle_one (event); |
3837 | } | |
24291992 | 3838 | |
8ff53139 PA |
3839 | /* It's OK to leave some of the threads of INF stopped, since |
3840 | they'll be detached shortly. */ | |
24291992 | 3841 | } |
24291992 PA |
3842 | } |
3843 | ||
cd0fc7c3 | 3844 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3845 | |
cd0fc7c3 SS |
3846 | If inferior gets a signal, we may decide to start it up again |
3847 | instead of returning. That is why there is a loop in this function. | |
3848 | When this function actually returns it means the inferior | |
3849 | should be left stopped and GDB should read more commands. */ | |
3850 | ||
5b6d1e4f PA |
3851 | static void |
3852 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3853 | { |
1eb8556f | 3854 | infrun_debug_printf ("wait_for_inferior ()"); |
527159b7 | 3855 | |
4c41382a | 3856 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3857 | |
e6f5c25b PA |
3858 | /* If an error happens while handling the event, propagate GDB's |
3859 | knowledge of the executing state to the frontend/user running | |
3860 | state. */ | |
5b6d1e4f PA |
3861 | scoped_finish_thread_state finish_state |
3862 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 3863 | |
c906108c SS |
3864 | while (1) |
3865 | { | |
ae25568b PA |
3866 | struct execution_control_state ecss; |
3867 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 3868 | |
ae25568b PA |
3869 | memset (ecs, 0, sizeof (*ecs)); |
3870 | ||
ec9499be | 3871 | overlay_cache_invalid = 1; |
ec9499be | 3872 | |
f15cb84a YQ |
3873 | /* Flush target cache before starting to handle each event. |
3874 | Target was running and cache could be stale. This is just a | |
3875 | heuristic. Running threads may modify target memory, but we | |
3876 | don't get any event. */ | |
3877 | target_dcache_invalidate (); | |
3878 | ||
5b6d1e4f PA |
3879 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
3880 | ecs->target = inf->process_target (); | |
c906108c | 3881 | |
f00150c9 | 3882 | if (debug_infrun) |
5b6d1e4f | 3883 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3884 | |
cd0fc7c3 SS |
3885 | /* Now figure out what to do with the result of the result. */ |
3886 | handle_inferior_event (ecs); | |
c906108c | 3887 | |
cd0fc7c3 SS |
3888 | if (!ecs->wait_some_more) |
3889 | break; | |
3890 | } | |
4e1c45ea | 3891 | |
e6f5c25b | 3892 | /* No error, don't finish the state yet. */ |
731f534f | 3893 | finish_state.release (); |
cd0fc7c3 | 3894 | } |
c906108c | 3895 | |
d3d4baed PA |
3896 | /* Cleanup that reinstalls the readline callback handler, if the |
3897 | target is running in the background. If while handling the target | |
3898 | event something triggered a secondary prompt, like e.g., a | |
3899 | pagination prompt, we'll have removed the callback handler (see | |
3900 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3901 | event loop, ready to process further input. Note this has no | |
3902 | effect if the handler hasn't actually been removed, because calling | |
3903 | rl_callback_handler_install resets the line buffer, thus losing | |
3904 | input. */ | |
3905 | ||
3906 | static void | |
d238133d | 3907 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 3908 | { |
3b12939d PA |
3909 | struct ui *ui = current_ui; |
3910 | ||
3911 | if (!ui->async) | |
6c400b59 PA |
3912 | { |
3913 | /* We're not going back to the top level event loop yet. Don't | |
3914 | install the readline callback, as it'd prep the terminal, | |
3915 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3916 | it the next time the prompt is displayed, when we're ready | |
3917 | for input. */ | |
3918 | return; | |
3919 | } | |
3920 | ||
3b12939d | 3921 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3922 | gdb_rl_callback_handler_reinstall (); |
3923 | } | |
3924 | ||
243a9253 PA |
3925 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3926 | that's just the event thread. In all-stop, that's all threads. */ | |
3927 | ||
3928 | static void | |
3929 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3930 | { | |
08036331 PA |
3931 | if (ecs->event_thread != NULL |
3932 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 3933 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
3934 | |
3935 | if (!non_stop) | |
3936 | { | |
08036331 | 3937 | for (thread_info *thr : all_non_exited_threads ()) |
dda83cd7 | 3938 | { |
243a9253 PA |
3939 | if (thr->thread_fsm == NULL) |
3940 | continue; | |
3941 | if (thr == ecs->event_thread) | |
3942 | continue; | |
3943 | ||
00431a78 | 3944 | switch_to_thread (thr); |
46e3ed7f | 3945 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
3946 | } |
3947 | ||
3948 | if (ecs->event_thread != NULL) | |
00431a78 | 3949 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3950 | } |
3951 | } | |
3952 | ||
3b12939d PA |
3953 | /* Helper for all_uis_check_sync_execution_done that works on the |
3954 | current UI. */ | |
3955 | ||
3956 | static void | |
3957 | check_curr_ui_sync_execution_done (void) | |
3958 | { | |
3959 | struct ui *ui = current_ui; | |
3960 | ||
3961 | if (ui->prompt_state == PROMPT_NEEDED | |
3962 | && ui->async | |
3963 | && !gdb_in_secondary_prompt_p (ui)) | |
3964 | { | |
223ffa71 | 3965 | target_terminal::ours (); |
76727919 | 3966 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3967 | ui_register_input_event_handler (ui); |
3b12939d PA |
3968 | } |
3969 | } | |
3970 | ||
3971 | /* See infrun.h. */ | |
3972 | ||
3973 | void | |
3974 | all_uis_check_sync_execution_done (void) | |
3975 | { | |
0e454242 | 3976 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3977 | { |
3978 | check_curr_ui_sync_execution_done (); | |
3979 | } | |
3980 | } | |
3981 | ||
a8836c93 PA |
3982 | /* See infrun.h. */ |
3983 | ||
3984 | void | |
3985 | all_uis_on_sync_execution_starting (void) | |
3986 | { | |
0e454242 | 3987 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3988 | { |
3989 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3990 | async_disable_stdin (); | |
3991 | } | |
3992 | } | |
3993 | ||
1777feb0 | 3994 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3995 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3996 | descriptor corresponding to the target. It can be called more than |
3997 | once to complete a single execution command. In such cases we need | |
3998 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3999 | that this function is called for a single execution command, then |
4000 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 4001 | necessary cleanups. */ |
43ff13b4 JM |
4002 | |
4003 | void | |
b1a35af2 | 4004 | fetch_inferior_event () |
43ff13b4 | 4005 | { |
3ec3145c SM |
4006 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
4007 | ||
0d1e5fa7 | 4008 | struct execution_control_state ecss; |
a474d7c2 | 4009 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 4010 | int cmd_done = 0; |
43ff13b4 | 4011 | |
0d1e5fa7 PA |
4012 | memset (ecs, 0, sizeof (*ecs)); |
4013 | ||
c61db772 PA |
4014 | /* Events are always processed with the main UI as current UI. This |
4015 | way, warnings, debug output, etc. are always consistently sent to | |
4016 | the main console. */ | |
4b6749b9 | 4017 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 4018 | |
b78b3a29 TBA |
4019 | /* Temporarily disable pagination. Otherwise, the user would be |
4020 | given an option to press 'q' to quit, which would cause an early | |
4021 | exit and could leave GDB in a half-baked state. */ | |
4022 | scoped_restore save_pagination | |
4023 | = make_scoped_restore (&pagination_enabled, false); | |
4024 | ||
d3d4baed | 4025 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
4026 | { |
4027 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
4028 | ||
4029 | /* We're handling a live event, so make sure we're doing live | |
4030 | debugging. If we're looking at traceframes while the target is | |
4031 | running, we're going to need to get back to that mode after | |
4032 | handling the event. */ | |
4033 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
4034 | if (non_stop) | |
4035 | { | |
4036 | maybe_restore_traceframe.emplace (); | |
4037 | set_current_traceframe (-1); | |
4038 | } | |
43ff13b4 | 4039 | |
873657b9 PA |
4040 | /* The user/frontend should not notice a thread switch due to |
4041 | internal events. Make sure we revert to the user selected | |
4042 | thread and frame after handling the event and running any | |
4043 | breakpoint commands. */ | |
4044 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
4045 | |
4046 | overlay_cache_invalid = 1; | |
4047 | /* Flush target cache before starting to handle each event. Target | |
4048 | was running and cache could be stale. This is just a heuristic. | |
4049 | Running threads may modify target memory, but we don't get any | |
4050 | event. */ | |
4051 | target_dcache_invalidate (); | |
4052 | ||
4053 | scoped_restore save_exec_dir | |
4054 | = make_scoped_restore (&execution_direction, | |
4055 | target_execution_direction ()); | |
4056 | ||
1192f124 SM |
4057 | /* Allow targets to pause their resumed threads while we handle |
4058 | the event. */ | |
4059 | scoped_disable_commit_resumed disable_commit_resumed ("handling event"); | |
4060 | ||
ac0d67ed | 4061 | if (!do_target_wait (ecs, TARGET_WNOHANG)) |
1192f124 SM |
4062 | { |
4063 | infrun_debug_printf ("do_target_wait returned no event"); | |
4064 | disable_commit_resumed.reset_and_commit (); | |
4065 | return; | |
4066 | } | |
5b6d1e4f PA |
4067 | |
4068 | gdb_assert (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
4069 | ||
4070 | /* Switch to the target that generated the event, so we can do | |
7f08fd51 TBA |
4071 | target calls. */ |
4072 | switch_to_target_no_thread (ecs->target); | |
d238133d TT |
4073 | |
4074 | if (debug_infrun) | |
5b6d1e4f | 4075 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
d238133d TT |
4076 | |
4077 | /* If an error happens while handling the event, propagate GDB's | |
4078 | knowledge of the executing state to the frontend/user running | |
4079 | state. */ | |
4080 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 4081 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 4082 | |
979a0d13 | 4083 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
4084 | still for the thread which has thrown the exception. */ |
4085 | auto defer_bpstat_clear | |
4086 | = make_scope_exit (bpstat_clear_actions); | |
4087 | auto defer_delete_threads | |
4088 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
4089 | ||
4090 | /* Now figure out what to do with the result of the result. */ | |
4091 | handle_inferior_event (ecs); | |
4092 | ||
4093 | if (!ecs->wait_some_more) | |
4094 | { | |
5b6d1e4f | 4095 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
758cb810 | 4096 | bool should_stop = true; |
d238133d | 4097 | struct thread_info *thr = ecs->event_thread; |
d6b48e9c | 4098 | |
d238133d | 4099 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 4100 | |
d238133d TT |
4101 | if (thr != NULL) |
4102 | { | |
4103 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 4104 | |
d238133d | 4105 | if (thread_fsm != NULL) |
46e3ed7f | 4106 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 4107 | } |
243a9253 | 4108 | |
d238133d TT |
4109 | if (!should_stop) |
4110 | { | |
4111 | keep_going (ecs); | |
4112 | } | |
4113 | else | |
4114 | { | |
46e3ed7f | 4115 | bool should_notify_stop = true; |
d238133d | 4116 | int proceeded = 0; |
1840d81a | 4117 | |
d238133d | 4118 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 4119 | |
d238133d | 4120 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 4121 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 4122 | |
d238133d TT |
4123 | if (should_notify_stop) |
4124 | { | |
4125 | /* We may not find an inferior if this was a process exit. */ | |
4126 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
4127 | proceeded = normal_stop (); | |
4128 | } | |
243a9253 | 4129 | |
d238133d TT |
4130 | if (!proceeded) |
4131 | { | |
b1a35af2 | 4132 | inferior_event_handler (INF_EXEC_COMPLETE); |
d238133d TT |
4133 | cmd_done = 1; |
4134 | } | |
873657b9 PA |
4135 | |
4136 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
4137 | previously selected thread is gone. We have two | |
4138 | choices - switch to no thread selected, or restore the | |
4139 | previously selected thread (now exited). We chose the | |
4140 | later, just because that's what GDB used to do. After | |
4141 | this, "info threads" says "The current thread <Thread | |
4142 | ID 2> has terminated." instead of "No thread | |
4143 | selected.". */ | |
4144 | if (!non_stop | |
4145 | && cmd_done | |
4146 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
4147 | restore_thread.dont_restore (); | |
d238133d TT |
4148 | } |
4149 | } | |
4f8d22e3 | 4150 | |
d238133d TT |
4151 | defer_delete_threads.release (); |
4152 | defer_bpstat_clear.release (); | |
29f49a6a | 4153 | |
d238133d TT |
4154 | /* No error, don't finish the thread states yet. */ |
4155 | finish_state.release (); | |
731f534f | 4156 | |
1192f124 SM |
4157 | disable_commit_resumed.reset_and_commit (); |
4158 | ||
d238133d TT |
4159 | /* This scope is used to ensure that readline callbacks are |
4160 | reinstalled here. */ | |
4161 | } | |
4f8d22e3 | 4162 | |
3b12939d PA |
4163 | /* If a UI was in sync execution mode, and now isn't, restore its |
4164 | prompt (a synchronous execution command has finished, and we're | |
4165 | ready for input). */ | |
4166 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4167 | |
4168 | if (cmd_done | |
0f641c01 | 4169 | && exec_done_display_p |
00431a78 PA |
4170 | && (inferior_ptid == null_ptid |
4171 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 4172 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
4173 | } |
4174 | ||
29734269 SM |
4175 | /* See infrun.h. */ |
4176 | ||
edb3359d | 4177 | void |
29734269 SM |
4178 | set_step_info (thread_info *tp, struct frame_info *frame, |
4179 | struct symtab_and_line sal) | |
edb3359d | 4180 | { |
29734269 SM |
4181 | /* This can be removed once this function no longer implicitly relies on the |
4182 | inferior_ptid value. */ | |
4183 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4184 | |
16c381f0 JK |
4185 | tp->control.step_frame_id = get_frame_id (frame); |
4186 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4187 | |
4188 | tp->current_symtab = sal.symtab; | |
4189 | tp->current_line = sal.line; | |
4190 | } | |
4191 | ||
0d1e5fa7 PA |
4192 | /* Clear context switchable stepping state. */ |
4193 | ||
4194 | void | |
4e1c45ea | 4195 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4196 | { |
7f5ef605 | 4197 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4198 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4199 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4200 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4201 | } |
4202 | ||
ab1ddbcf | 4203 | /* See infrun.h. */ |
c32c64b7 | 4204 | |
6efcd9a8 | 4205 | void |
5b6d1e4f PA |
4206 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
4207 | target_waitstatus status) | |
c32c64b7 | 4208 | { |
5b6d1e4f | 4209 | target_last_proc_target = target; |
c32c64b7 DE |
4210 | target_last_wait_ptid = ptid; |
4211 | target_last_waitstatus = status; | |
4212 | } | |
4213 | ||
ab1ddbcf | 4214 | /* See infrun.h. */ |
e02bc4cc DS |
4215 | |
4216 | void | |
5b6d1e4f PA |
4217 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4218 | target_waitstatus *status) | |
e02bc4cc | 4219 | { |
5b6d1e4f PA |
4220 | if (target != nullptr) |
4221 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4222 | if (ptid != nullptr) |
4223 | *ptid = target_last_wait_ptid; | |
4224 | if (status != nullptr) | |
4225 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4226 | } |
4227 | ||
ab1ddbcf PA |
4228 | /* See infrun.h. */ |
4229 | ||
ac264b3b MS |
4230 | void |
4231 | nullify_last_target_wait_ptid (void) | |
4232 | { | |
5b6d1e4f | 4233 | target_last_proc_target = nullptr; |
ac264b3b | 4234 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4235 | target_last_waitstatus = {}; |
ac264b3b MS |
4236 | } |
4237 | ||
dcf4fbde | 4238 | /* Switch thread contexts. */ |
dd80620e MS |
4239 | |
4240 | static void | |
00431a78 | 4241 | context_switch (execution_control_state *ecs) |
dd80620e | 4242 | { |
1eb8556f | 4243 | if (ecs->ptid != inferior_ptid |
5b6d1e4f PA |
4244 | && (inferior_ptid == null_ptid |
4245 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 | 4246 | { |
1eb8556f SM |
4247 | infrun_debug_printf ("Switching context from %s to %s", |
4248 | target_pid_to_str (inferior_ptid).c_str (), | |
4249 | target_pid_to_str (ecs->ptid).c_str ()); | |
fd48f117 DJ |
4250 | } |
4251 | ||
00431a78 | 4252 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4253 | } |
4254 | ||
d8dd4d5f PA |
4255 | /* If the target can't tell whether we've hit breakpoints |
4256 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4257 | check whether that could have been caused by a breakpoint. If so, | |
4258 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4259 | ||
4fa8626c | 4260 | static void |
d8dd4d5f | 4261 | adjust_pc_after_break (struct thread_info *thread, |
1edb66d8 | 4262 | const target_waitstatus *ws) |
4fa8626c | 4263 | { |
24a73cce UW |
4264 | struct regcache *regcache; |
4265 | struct gdbarch *gdbarch; | |
118e6252 | 4266 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4267 | |
4fa8626c DJ |
4268 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4269 | we aren't, just return. | |
9709f61c DJ |
4270 | |
4271 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4272 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4273 | implemented by software breakpoints should be handled through the normal | |
4274 | breakpoint layer. | |
8fb3e588 | 4275 | |
4fa8626c DJ |
4276 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4277 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4278 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4279 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4280 | generates these signals at breakpoints (the code has been in GDB since at | |
4281 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4282 | |
e6cf7916 UW |
4283 | In earlier versions of GDB, a target with |
4284 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4285 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4286 | target with both of these set in GDB history, and it seems unlikely to be | |
4287 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4288 | |
d8dd4d5f | 4289 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4290 | return; |
4291 | ||
d8dd4d5f | 4292 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4293 | return; |
4294 | ||
4058b839 PA |
4295 | /* In reverse execution, when a breakpoint is hit, the instruction |
4296 | under it has already been de-executed. The reported PC always | |
4297 | points at the breakpoint address, so adjusting it further would | |
4298 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4299 | architecture: | |
4300 | ||
4301 | B1 0x08000000 : INSN1 | |
4302 | B2 0x08000001 : INSN2 | |
4303 | 0x08000002 : INSN3 | |
4304 | PC -> 0x08000003 : INSN4 | |
4305 | ||
4306 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4307 | from that point should hit B2 as below. Reading the PC when the | |
4308 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4309 | been de-executed already. | |
4310 | ||
4311 | B1 0x08000000 : INSN1 | |
4312 | B2 PC -> 0x08000001 : INSN2 | |
4313 | 0x08000002 : INSN3 | |
4314 | 0x08000003 : INSN4 | |
4315 | ||
4316 | We can't apply the same logic as for forward execution, because | |
4317 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4318 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4319 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4320 | behaviour. */ | |
4321 | if (execution_direction == EXEC_REVERSE) | |
4322 | return; | |
4323 | ||
1cf4d951 PA |
4324 | /* If the target can tell whether the thread hit a SW breakpoint, |
4325 | trust it. Targets that can tell also adjust the PC | |
4326 | themselves. */ | |
4327 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4328 | return; | |
4329 | ||
4330 | /* Note that relying on whether a breakpoint is planted in memory to | |
4331 | determine this can fail. E.g,. the breakpoint could have been | |
4332 | removed since. Or the thread could have been told to step an | |
4333 | instruction the size of a breakpoint instruction, and only | |
4334 | _after_ was a breakpoint inserted at its address. */ | |
4335 | ||
24a73cce UW |
4336 | /* If this target does not decrement the PC after breakpoints, then |
4337 | we have nothing to do. */ | |
00431a78 | 4338 | regcache = get_thread_regcache (thread); |
ac7936df | 4339 | gdbarch = regcache->arch (); |
118e6252 | 4340 | |
527a273a | 4341 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4342 | if (decr_pc == 0) |
24a73cce UW |
4343 | return; |
4344 | ||
8b86c959 | 4345 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4346 | |
8aad930b AC |
4347 | /* Find the location where (if we've hit a breakpoint) the |
4348 | breakpoint would be. */ | |
118e6252 | 4349 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4350 | |
1cf4d951 PA |
4351 | /* If the target can't tell whether a software breakpoint triggered, |
4352 | fallback to figuring it out based on breakpoints we think were | |
4353 | inserted in the target, and on whether the thread was stepped or | |
4354 | continued. */ | |
4355 | ||
1c5cfe86 PA |
4356 | /* Check whether there actually is a software breakpoint inserted at |
4357 | that location. | |
4358 | ||
4359 | If in non-stop mode, a race condition is possible where we've | |
4360 | removed a breakpoint, but stop events for that breakpoint were | |
4361 | already queued and arrive later. To suppress those spurious | |
4362 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4363 | and retire them after a number of stop events are reported. Note |
4364 | this is an heuristic and can thus get confused. The real fix is | |
4365 | to get the "stopped by SW BP and needs adjustment" info out of | |
4366 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4367 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4368 | || (target_is_non_stop_p () |
4369 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4370 | { |
07036511 | 4371 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4372 | |
8213266a | 4373 | if (record_full_is_used ()) |
07036511 TT |
4374 | restore_operation_disable.emplace |
4375 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4376 | |
1c0fdd0e UW |
4377 | /* When using hardware single-step, a SIGTRAP is reported for both |
4378 | a completed single-step and a software breakpoint. Need to | |
4379 | differentiate between the two, as the latter needs adjusting | |
4380 | but the former does not. | |
4381 | ||
4382 | The SIGTRAP can be due to a completed hardware single-step only if | |
4383 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4384 | - this thread is currently being stepped |
4385 | ||
4386 | If any of these events did not occur, we must have stopped due | |
4387 | to hitting a software breakpoint, and have to back up to the | |
4388 | breakpoint address. | |
4389 | ||
4390 | As a special case, we could have hardware single-stepped a | |
4391 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4392 | we also need to back up to the breakpoint address. */ | |
4393 | ||
d8dd4d5f PA |
4394 | if (thread_has_single_step_breakpoints_set (thread) |
4395 | || !currently_stepping (thread) | |
4396 | || (thread->stepped_breakpoint | |
4397 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4398 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4399 | } |
4fa8626c DJ |
4400 | } |
4401 | ||
c4464ade | 4402 | static bool |
edb3359d DJ |
4403 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) |
4404 | { | |
4405 | for (frame = get_prev_frame (frame); | |
4406 | frame != NULL; | |
4407 | frame = get_prev_frame (frame)) | |
4408 | { | |
4409 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
c4464ade SM |
4410 | return true; |
4411 | ||
edb3359d DJ |
4412 | if (get_frame_type (frame) != INLINE_FRAME) |
4413 | break; | |
4414 | } | |
4415 | ||
c4464ade | 4416 | return false; |
edb3359d DJ |
4417 | } |
4418 | ||
4a4c04f1 BE |
4419 | /* Look for an inline frame that is marked for skip. |
4420 | If PREV_FRAME is TRUE start at the previous frame, | |
4421 | otherwise start at the current frame. Stop at the | |
4422 | first non-inline frame, or at the frame where the | |
4423 | step started. */ | |
4424 | ||
4425 | static bool | |
4426 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4427 | { | |
4428 | struct frame_info *frame = get_current_frame (); | |
4429 | ||
4430 | if (prev_frame) | |
4431 | frame = get_prev_frame (frame); | |
4432 | ||
4433 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4434 | { | |
4435 | const char *fn = NULL; | |
4436 | symtab_and_line sal; | |
4437 | struct symbol *sym; | |
4438 | ||
4439 | if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id)) | |
4440 | break; | |
4441 | if (get_frame_type (frame) != INLINE_FRAME) | |
4442 | break; | |
4443 | ||
4444 | sal = find_frame_sal (frame); | |
4445 | sym = get_frame_function (frame); | |
4446 | ||
4447 | if (sym != NULL) | |
4448 | fn = sym->print_name (); | |
4449 | ||
4450 | if (sal.line != 0 | |
4451 | && function_name_is_marked_for_skip (fn, sal)) | |
4452 | return true; | |
4453 | } | |
4454 | ||
4455 | return false; | |
4456 | } | |
4457 | ||
c65d6b55 PA |
4458 | /* If the event thread has the stop requested flag set, pretend it |
4459 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4460 | target_stop). */ | |
4461 | ||
4462 | static bool | |
4463 | handle_stop_requested (struct execution_control_state *ecs) | |
4464 | { | |
4465 | if (ecs->event_thread->stop_requested) | |
4466 | { | |
4467 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4468 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4469 | handle_signal_stop (ecs); | |
4470 | return true; | |
4471 | } | |
4472 | return false; | |
4473 | } | |
4474 | ||
a96d9b2e | 4475 | /* Auxiliary function that handles syscall entry/return events. |
c4464ade SM |
4476 | It returns true if the inferior should keep going (and GDB |
4477 | should ignore the event), or false if the event deserves to be | |
a96d9b2e | 4478 | processed. */ |
ca2163eb | 4479 | |
c4464ade | 4480 | static bool |
ca2163eb | 4481 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4482 | { |
ca2163eb | 4483 | struct regcache *regcache; |
ca2163eb PA |
4484 | int syscall_number; |
4485 | ||
00431a78 | 4486 | context_switch (ecs); |
ca2163eb | 4487 | |
00431a78 | 4488 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4489 | syscall_number = ecs->ws.value.syscall_number; |
1edb66d8 | 4490 | ecs->event_thread->set_stop_pc (regcache_read_pc (regcache)); |
ca2163eb | 4491 | |
a96d9b2e SDJ |
4492 | if (catch_syscall_enabled () > 0 |
4493 | && catching_syscall_number (syscall_number) > 0) | |
4494 | { | |
1eb8556f | 4495 | infrun_debug_printf ("syscall number=%d", syscall_number); |
a96d9b2e | 4496 | |
16c381f0 | 4497 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4498 | = bpstat_stop_status (regcache->aspace (), |
1edb66d8 | 4499 | ecs->event_thread->stop_pc (), |
f2ffa92b | 4500 | ecs->event_thread, &ecs->ws); |
ab04a2af | 4501 | |
c65d6b55 | 4502 | if (handle_stop_requested (ecs)) |
c4464ade | 4503 | return false; |
c65d6b55 | 4504 | |
ce12b012 | 4505 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4506 | { |
4507 | /* Catchpoint hit. */ | |
c4464ade | 4508 | return false; |
ca2163eb | 4509 | } |
a96d9b2e | 4510 | } |
ca2163eb | 4511 | |
c65d6b55 | 4512 | if (handle_stop_requested (ecs)) |
c4464ade | 4513 | return false; |
c65d6b55 | 4514 | |
ca2163eb | 4515 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb | 4516 | keep_going (ecs); |
c4464ade SM |
4517 | |
4518 | return true; | |
a96d9b2e SDJ |
4519 | } |
4520 | ||
7e324e48 GB |
4521 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4522 | ||
4523 | static void | |
4524 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4525 | struct execution_control_state *ecs) | |
4526 | { | |
4527 | if (!ecs->stop_func_filled_in) | |
4528 | { | |
98a617f8 | 4529 | const block *block; |
fe830662 | 4530 | const general_symbol_info *gsi; |
98a617f8 | 4531 | |
7e324e48 GB |
4532 | /* Don't care about return value; stop_func_start and stop_func_name |
4533 | will both be 0 if it doesn't work. */ | |
1edb66d8 | 4534 | find_pc_partial_function_sym (ecs->event_thread->stop_pc (), |
fe830662 TT |
4535 | &gsi, |
4536 | &ecs->stop_func_start, | |
4537 | &ecs->stop_func_end, | |
4538 | &block); | |
4539 | ecs->stop_func_name = gsi == nullptr ? nullptr : gsi->print_name (); | |
98a617f8 KB |
4540 | |
4541 | /* The call to find_pc_partial_function, above, will set | |
4542 | stop_func_start and stop_func_end to the start and end | |
4543 | of the range containing the stop pc. If this range | |
4544 | contains the entry pc for the block (which is always the | |
4545 | case for contiguous blocks), advance stop_func_start past | |
4546 | the function's start offset and entrypoint. Note that | |
4547 | stop_func_start is NOT advanced when in a range of a | |
4548 | non-contiguous block that does not contain the entry pc. */ | |
4549 | if (block != nullptr | |
4550 | && ecs->stop_func_start <= BLOCK_ENTRY_PC (block) | |
4551 | && BLOCK_ENTRY_PC (block) < ecs->stop_func_end) | |
4552 | { | |
4553 | ecs->stop_func_start | |
4554 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4555 | ||
4556 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4557 | ecs->stop_func_start | |
4558 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4559 | } | |
591a12a1 | 4560 | |
7e324e48 GB |
4561 | ecs->stop_func_filled_in = 1; |
4562 | } | |
4563 | } | |
4564 | ||
4f5d7f63 | 4565 | |
00431a78 | 4566 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4567 | |
4568 | static enum stop_kind | |
00431a78 | 4569 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4570 | { |
5b6d1e4f | 4571 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4572 | |
4573 | gdb_assert (inf != NULL); | |
4574 | return inf->control.stop_soon; | |
4575 | } | |
4576 | ||
5b6d1e4f PA |
4577 | /* Poll for one event out of the current target. Store the resulting |
4578 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4579 | |
4580 | static ptid_t | |
5b6d1e4f | 4581 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4582 | { |
4583 | ptid_t event_ptid; | |
372316f1 PA |
4584 | |
4585 | overlay_cache_invalid = 1; | |
4586 | ||
4587 | /* Flush target cache before starting to handle each event. | |
4588 | Target was running and cache could be stale. This is just a | |
4589 | heuristic. Running threads may modify target memory, but we | |
4590 | don't get any event. */ | |
4591 | target_dcache_invalidate (); | |
4592 | ||
4593 | if (deprecated_target_wait_hook) | |
5b6d1e4f | 4594 | event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 | 4595 | else |
5b6d1e4f | 4596 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4597 | |
4598 | if (debug_infrun) | |
5b6d1e4f | 4599 | print_target_wait_results (minus_one_ptid, event_ptid, ws); |
372316f1 PA |
4600 | |
4601 | return event_ptid; | |
4602 | } | |
4603 | ||
5b6d1e4f PA |
4604 | /* Wait for one event out of any target. */ |
4605 | ||
4606 | static wait_one_event | |
4607 | wait_one () | |
4608 | { | |
4609 | while (1) | |
4610 | { | |
4611 | for (inferior *inf : all_inferiors ()) | |
4612 | { | |
4613 | process_stratum_target *target = inf->process_target (); | |
4614 | if (target == NULL | |
4615 | || !target->is_async_p () | |
4616 | || !target->threads_executing) | |
4617 | continue; | |
4618 | ||
4619 | switch_to_inferior_no_thread (inf); | |
4620 | ||
4621 | wait_one_event event; | |
4622 | event.target = target; | |
4623 | event.ptid = poll_one_curr_target (&event.ws); | |
4624 | ||
4625 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4626 | { | |
4627 | /* If nothing is resumed, remove the target from the | |
4628 | event loop. */ | |
4629 | target_async (0); | |
4630 | } | |
4631 | else if (event.ws.kind != TARGET_WAITKIND_IGNORE) | |
4632 | return event; | |
4633 | } | |
4634 | ||
4635 | /* Block waiting for some event. */ | |
4636 | ||
4637 | fd_set readfds; | |
4638 | int nfds = 0; | |
4639 | ||
4640 | FD_ZERO (&readfds); | |
4641 | ||
4642 | for (inferior *inf : all_inferiors ()) | |
4643 | { | |
4644 | process_stratum_target *target = inf->process_target (); | |
4645 | if (target == NULL | |
4646 | || !target->is_async_p () | |
4647 | || !target->threads_executing) | |
4648 | continue; | |
4649 | ||
4650 | int fd = target->async_wait_fd (); | |
4651 | FD_SET (fd, &readfds); | |
4652 | if (nfds <= fd) | |
4653 | nfds = fd + 1; | |
4654 | } | |
4655 | ||
4656 | if (nfds == 0) | |
4657 | { | |
4658 | /* No waitable targets left. All must be stopped. */ | |
4659 | return {NULL, minus_one_ptid, {TARGET_WAITKIND_NO_RESUMED}}; | |
4660 | } | |
4661 | ||
4662 | QUIT; | |
4663 | ||
4664 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4665 | if (numfds < 0) | |
4666 | { | |
4667 | if (errno == EINTR) | |
4668 | continue; | |
4669 | else | |
4670 | perror_with_name ("interruptible_select"); | |
4671 | } | |
4672 | } | |
4673 | } | |
4674 | ||
372316f1 PA |
4675 | /* Save the thread's event and stop reason to process it later. */ |
4676 | ||
4677 | static void | |
5b6d1e4f | 4678 | save_waitstatus (struct thread_info *tp, const target_waitstatus *ws) |
372316f1 | 4679 | { |
1eb8556f SM |
4680 | infrun_debug_printf ("saving status %s for %d.%ld.%ld", |
4681 | target_waitstatus_to_string (ws).c_str (), | |
4682 | tp->ptid.pid (), | |
4683 | tp->ptid.lwp (), | |
4684 | tp->ptid.tid ()); | |
372316f1 PA |
4685 | |
4686 | /* Record for later. */ | |
1edb66d8 | 4687 | tp->set_pending_waitstatus (*ws); |
372316f1 | 4688 | |
372316f1 PA |
4689 | if (ws->kind == TARGET_WAITKIND_STOPPED |
4690 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4691 | { | |
89ba430c SM |
4692 | struct regcache *regcache = get_thread_regcache (tp); |
4693 | const address_space *aspace = regcache->aspace (); | |
372316f1 PA |
4694 | CORE_ADDR pc = regcache_read_pc (regcache); |
4695 | ||
1edb66d8 | 4696 | adjust_pc_after_break (tp, &tp->pending_waitstatus ()); |
372316f1 | 4697 | |
18493a00 PA |
4698 | scoped_restore_current_thread restore_thread; |
4699 | switch_to_thread (tp); | |
4700 | ||
4701 | if (target_stopped_by_watchpoint ()) | |
1edb66d8 | 4702 | tp->set_stop_reason (TARGET_STOPPED_BY_WATCHPOINT); |
372316f1 | 4703 | else if (target_supports_stopped_by_sw_breakpoint () |
18493a00 | 4704 | && target_stopped_by_sw_breakpoint ()) |
1edb66d8 | 4705 | tp->set_stop_reason (TARGET_STOPPED_BY_SW_BREAKPOINT); |
372316f1 | 4706 | else if (target_supports_stopped_by_hw_breakpoint () |
18493a00 | 4707 | && target_stopped_by_hw_breakpoint ()) |
1edb66d8 | 4708 | tp->set_stop_reason (TARGET_STOPPED_BY_HW_BREAKPOINT); |
372316f1 | 4709 | else if (!target_supports_stopped_by_hw_breakpoint () |
1edb66d8 SM |
4710 | && hardware_breakpoint_inserted_here_p (aspace, pc)) |
4711 | tp->set_stop_reason (TARGET_STOPPED_BY_HW_BREAKPOINT); | |
372316f1 | 4712 | else if (!target_supports_stopped_by_sw_breakpoint () |
1edb66d8 SM |
4713 | && software_breakpoint_inserted_here_p (aspace, pc)) |
4714 | tp->set_stop_reason (TARGET_STOPPED_BY_SW_BREAKPOINT); | |
372316f1 PA |
4715 | else if (!thread_has_single_step_breakpoints_set (tp) |
4716 | && currently_stepping (tp)) | |
1edb66d8 | 4717 | tp->set_stop_reason (TARGET_STOPPED_BY_SINGLE_STEP); |
372316f1 PA |
4718 | } |
4719 | } | |
4720 | ||
293b3ebc TBA |
4721 | /* Mark the non-executing threads accordingly. In all-stop, all |
4722 | threads of all processes are stopped when we get any event | |
4723 | reported. In non-stop mode, only the event thread stops. */ | |
4724 | ||
4725 | static void | |
4726 | mark_non_executing_threads (process_stratum_target *target, | |
4727 | ptid_t event_ptid, | |
4728 | struct target_waitstatus ws) | |
4729 | { | |
4730 | ptid_t mark_ptid; | |
4731 | ||
4732 | if (!target_is_non_stop_p ()) | |
4733 | mark_ptid = minus_one_ptid; | |
4734 | else if (ws.kind == TARGET_WAITKIND_SIGNALLED | |
4735 | || ws.kind == TARGET_WAITKIND_EXITED) | |
4736 | { | |
4737 | /* If we're handling a process exit in non-stop mode, even | |
4738 | though threads haven't been deleted yet, one would think | |
4739 | that there is nothing to do, as threads of the dead process | |
4740 | will be soon deleted, and threads of any other process were | |
4741 | left running. However, on some targets, threads survive a | |
4742 | process exit event. E.g., for the "checkpoint" command, | |
4743 | when the current checkpoint/fork exits, linux-fork.c | |
4744 | automatically switches to another fork from within | |
4745 | target_mourn_inferior, by associating the same | |
4746 | inferior/thread to another fork. We haven't mourned yet at | |
4747 | this point, but we must mark any threads left in the | |
4748 | process as not-executing so that finish_thread_state marks | |
4749 | them stopped (in the user's perspective) if/when we present | |
4750 | the stop to the user. */ | |
4751 | mark_ptid = ptid_t (event_ptid.pid ()); | |
4752 | } | |
4753 | else | |
4754 | mark_ptid = event_ptid; | |
4755 | ||
4756 | set_executing (target, mark_ptid, false); | |
4757 | ||
4758 | /* Likewise the resumed flag. */ | |
4759 | set_resumed (target, mark_ptid, false); | |
4760 | } | |
4761 | ||
d758e62c PA |
4762 | /* Handle one event after stopping threads. If the eventing thread |
4763 | reports back any interesting event, we leave it pending. If the | |
4764 | eventing thread was in the middle of a displaced step, we | |
8ff53139 PA |
4765 | cancel/finish it, and unless the thread's inferior is being |
4766 | detached, put the thread back in the step-over chain. Returns true | |
4767 | if there are no resumed threads left in the target (thus there's no | |
4768 | point in waiting further), false otherwise. */ | |
d758e62c PA |
4769 | |
4770 | static bool | |
4771 | handle_one (const wait_one_event &event) | |
4772 | { | |
4773 | infrun_debug_printf | |
4774 | ("%s %s", target_waitstatus_to_string (&event.ws).c_str (), | |
4775 | target_pid_to_str (event.ptid).c_str ()); | |
4776 | ||
4777 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4778 | { | |
4779 | /* All resumed threads exited. */ | |
4780 | return true; | |
4781 | } | |
4782 | else if (event.ws.kind == TARGET_WAITKIND_THREAD_EXITED | |
4783 | || event.ws.kind == TARGET_WAITKIND_EXITED | |
4784 | || event.ws.kind == TARGET_WAITKIND_SIGNALLED) | |
4785 | { | |
4786 | /* One thread/process exited/signalled. */ | |
4787 | ||
4788 | thread_info *t = nullptr; | |
4789 | ||
4790 | /* The target may have reported just a pid. If so, try | |
4791 | the first non-exited thread. */ | |
4792 | if (event.ptid.is_pid ()) | |
4793 | { | |
4794 | int pid = event.ptid.pid (); | |
4795 | inferior *inf = find_inferior_pid (event.target, pid); | |
4796 | for (thread_info *tp : inf->non_exited_threads ()) | |
4797 | { | |
4798 | t = tp; | |
4799 | break; | |
4800 | } | |
4801 | ||
4802 | /* If there is no available thread, the event would | |
4803 | have to be appended to a per-inferior event list, | |
4804 | which does not exist (and if it did, we'd have | |
4805 | to adjust run control command to be able to | |
4806 | resume such an inferior). We assert here instead | |
4807 | of going into an infinite loop. */ | |
4808 | gdb_assert (t != nullptr); | |
4809 | ||
4810 | infrun_debug_printf | |
4811 | ("using %s", target_pid_to_str (t->ptid).c_str ()); | |
4812 | } | |
4813 | else | |
4814 | { | |
4815 | t = find_thread_ptid (event.target, event.ptid); | |
4816 | /* Check if this is the first time we see this thread. | |
4817 | Don't bother adding if it individually exited. */ | |
4818 | if (t == nullptr | |
4819 | && event.ws.kind != TARGET_WAITKIND_THREAD_EXITED) | |
4820 | t = add_thread (event.target, event.ptid); | |
4821 | } | |
4822 | ||
4823 | if (t != nullptr) | |
4824 | { | |
4825 | /* Set the threads as non-executing to avoid | |
4826 | another stop attempt on them. */ | |
4827 | switch_to_thread_no_regs (t); | |
4828 | mark_non_executing_threads (event.target, event.ptid, | |
4829 | event.ws); | |
4830 | save_waitstatus (t, &event.ws); | |
4831 | t->stop_requested = false; | |
4832 | } | |
4833 | } | |
4834 | else | |
4835 | { | |
4836 | thread_info *t = find_thread_ptid (event.target, event.ptid); | |
4837 | if (t == NULL) | |
4838 | t = add_thread (event.target, event.ptid); | |
4839 | ||
4840 | t->stop_requested = 0; | |
4841 | t->executing = 0; | |
7846f3aa | 4842 | t->set_resumed (false); |
d758e62c PA |
4843 | t->control.may_range_step = 0; |
4844 | ||
4845 | /* This may be the first time we see the inferior report | |
4846 | a stop. */ | |
4847 | inferior *inf = find_inferior_ptid (event.target, event.ptid); | |
4848 | if (inf->needs_setup) | |
4849 | { | |
4850 | switch_to_thread_no_regs (t); | |
4851 | setup_inferior (0); | |
4852 | } | |
4853 | ||
4854 | if (event.ws.kind == TARGET_WAITKIND_STOPPED | |
4855 | && event.ws.value.sig == GDB_SIGNAL_0) | |
4856 | { | |
4857 | /* We caught the event that we intended to catch, so | |
1edb66d8 | 4858 | there's no event to save as pending. */ |
d758e62c PA |
4859 | |
4860 | if (displaced_step_finish (t, GDB_SIGNAL_0) | |
4861 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) | |
4862 | { | |
4863 | /* Add it back to the step-over queue. */ | |
4864 | infrun_debug_printf | |
4865 | ("displaced-step of %s canceled", | |
4866 | target_pid_to_str (t->ptid).c_str ()); | |
4867 | ||
4868 | t->control.trap_expected = 0; | |
8ff53139 PA |
4869 | if (!t->inf->detaching) |
4870 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
4871 | } |
4872 | } | |
4873 | else | |
4874 | { | |
4875 | enum gdb_signal sig; | |
4876 | struct regcache *regcache; | |
4877 | ||
4878 | infrun_debug_printf | |
4879 | ("target_wait %s, saving status for %d.%ld.%ld", | |
4880 | target_waitstatus_to_string (&event.ws).c_str (), | |
4881 | t->ptid.pid (), t->ptid.lwp (), t->ptid.tid ()); | |
4882 | ||
4883 | /* Record for later. */ | |
4884 | save_waitstatus (t, &event.ws); | |
4885 | ||
4886 | sig = (event.ws.kind == TARGET_WAITKIND_STOPPED | |
4887 | ? event.ws.value.sig : GDB_SIGNAL_0); | |
4888 | ||
4889 | if (displaced_step_finish (t, sig) | |
4890 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) | |
4891 | { | |
4892 | /* Add it back to the step-over queue. */ | |
4893 | t->control.trap_expected = 0; | |
8ff53139 PA |
4894 | if (!t->inf->detaching) |
4895 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
4896 | } |
4897 | ||
4898 | regcache = get_thread_regcache (t); | |
1edb66d8 | 4899 | t->set_stop_pc (regcache_read_pc (regcache)); |
d758e62c PA |
4900 | |
4901 | infrun_debug_printf ("saved stop_pc=%s for %s " | |
4902 | "(currently_stepping=%d)", | |
1edb66d8 | 4903 | paddress (target_gdbarch (), t->stop_pc ()), |
d758e62c PA |
4904 | target_pid_to_str (t->ptid).c_str (), |
4905 | currently_stepping (t)); | |
4906 | } | |
4907 | } | |
4908 | ||
4909 | return false; | |
4910 | } | |
4911 | ||
6efcd9a8 | 4912 | /* See infrun.h. */ |
372316f1 | 4913 | |
6efcd9a8 | 4914 | void |
372316f1 PA |
4915 | stop_all_threads (void) |
4916 | { | |
4917 | /* We may need multiple passes to discover all threads. */ | |
4918 | int pass; | |
4919 | int iterations = 0; | |
372316f1 | 4920 | |
53cccef1 | 4921 | gdb_assert (exists_non_stop_target ()); |
372316f1 | 4922 | |
1eb8556f | 4923 | infrun_debug_printf ("starting"); |
372316f1 | 4924 | |
00431a78 | 4925 | scoped_restore_current_thread restore_thread; |
372316f1 | 4926 | |
6ad82919 TBA |
4927 | /* Enable thread events of all targets. */ |
4928 | for (auto *target : all_non_exited_process_targets ()) | |
4929 | { | |
4930 | switch_to_target_no_thread (target); | |
4931 | target_thread_events (true); | |
4932 | } | |
4933 | ||
4934 | SCOPE_EXIT | |
4935 | { | |
4936 | /* Disable thread events of all targets. */ | |
4937 | for (auto *target : all_non_exited_process_targets ()) | |
4938 | { | |
4939 | switch_to_target_no_thread (target); | |
4940 | target_thread_events (false); | |
4941 | } | |
4942 | ||
17417fb0 | 4943 | /* Use debug_prefixed_printf directly to get a meaningful function |
dda83cd7 | 4944 | name. */ |
6ad82919 | 4945 | if (debug_infrun) |
17417fb0 | 4946 | debug_prefixed_printf ("infrun", "stop_all_threads", "done"); |
6ad82919 | 4947 | }; |
65706a29 | 4948 | |
372316f1 PA |
4949 | /* Request threads to stop, and then wait for the stops. Because |
4950 | threads we already know about can spawn more threads while we're | |
4951 | trying to stop them, and we only learn about new threads when we | |
4952 | update the thread list, do this in a loop, and keep iterating | |
4953 | until two passes find no threads that need to be stopped. */ | |
4954 | for (pass = 0; pass < 2; pass++, iterations++) | |
4955 | { | |
1eb8556f | 4956 | infrun_debug_printf ("pass=%d, iterations=%d", pass, iterations); |
372316f1 PA |
4957 | while (1) |
4958 | { | |
29d6859f | 4959 | int waits_needed = 0; |
372316f1 | 4960 | |
a05575d3 TBA |
4961 | for (auto *target : all_non_exited_process_targets ()) |
4962 | { | |
4963 | switch_to_target_no_thread (target); | |
4964 | update_thread_list (); | |
4965 | } | |
372316f1 PA |
4966 | |
4967 | /* Go through all threads looking for threads that we need | |
4968 | to tell the target to stop. */ | |
08036331 | 4969 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 4970 | { |
53cccef1 TBA |
4971 | /* For a single-target setting with an all-stop target, |
4972 | we would not even arrive here. For a multi-target | |
4973 | setting, until GDB is able to handle a mixture of | |
4974 | all-stop and non-stop targets, simply skip all-stop | |
4975 | targets' threads. This should be fine due to the | |
4976 | protection of 'check_multi_target_resumption'. */ | |
4977 | ||
4978 | switch_to_thread_no_regs (t); | |
4979 | if (!target_is_non_stop_p ()) | |
4980 | continue; | |
4981 | ||
372316f1 PA |
4982 | if (t->executing) |
4983 | { | |
4984 | /* If already stopping, don't request a stop again. | |
4985 | We just haven't seen the notification yet. */ | |
4986 | if (!t->stop_requested) | |
4987 | { | |
1eb8556f SM |
4988 | infrun_debug_printf (" %s executing, need stop", |
4989 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4990 | target_stop (t->ptid); |
4991 | t->stop_requested = 1; | |
4992 | } | |
4993 | else | |
4994 | { | |
1eb8556f SM |
4995 | infrun_debug_printf (" %s executing, already stopping", |
4996 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4997 | } |
4998 | ||
4999 | if (t->stop_requested) | |
29d6859f | 5000 | waits_needed++; |
372316f1 PA |
5001 | } |
5002 | else | |
5003 | { | |
1eb8556f SM |
5004 | infrun_debug_printf (" %s not executing", |
5005 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
5006 | |
5007 | /* The thread may be not executing, but still be | |
5008 | resumed with a pending status to process. */ | |
7846f3aa | 5009 | t->set_resumed (false); |
372316f1 PA |
5010 | } |
5011 | } | |
5012 | ||
29d6859f | 5013 | if (waits_needed == 0) |
372316f1 PA |
5014 | break; |
5015 | ||
5016 | /* If we find new threads on the second iteration, restart | |
5017 | over. We want to see two iterations in a row with all | |
5018 | threads stopped. */ | |
5019 | if (pass > 0) | |
5020 | pass = -1; | |
5021 | ||
29d6859f | 5022 | for (int i = 0; i < waits_needed; i++) |
c29705b7 | 5023 | { |
29d6859f | 5024 | wait_one_event event = wait_one (); |
d758e62c PA |
5025 | if (handle_one (event)) |
5026 | break; | |
372316f1 PA |
5027 | } |
5028 | } | |
5029 | } | |
372316f1 PA |
5030 | } |
5031 | ||
f4836ba9 PA |
5032 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
5033 | ||
c4464ade | 5034 | static bool |
f4836ba9 PA |
5035 | handle_no_resumed (struct execution_control_state *ecs) |
5036 | { | |
3b12939d | 5037 | if (target_can_async_p ()) |
f4836ba9 | 5038 | { |
c4464ade | 5039 | bool any_sync = false; |
f4836ba9 | 5040 | |
2dab0c7b | 5041 | for (ui *ui : all_uis ()) |
3b12939d PA |
5042 | { |
5043 | if (ui->prompt_state == PROMPT_BLOCKED) | |
5044 | { | |
c4464ade | 5045 | any_sync = true; |
3b12939d PA |
5046 | break; |
5047 | } | |
5048 | } | |
5049 | if (!any_sync) | |
5050 | { | |
5051 | /* There were no unwaited-for children left in the target, but, | |
5052 | we're not synchronously waiting for events either. Just | |
5053 | ignore. */ | |
5054 | ||
1eb8556f | 5055 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)"); |
3b12939d | 5056 | prepare_to_wait (ecs); |
c4464ade | 5057 | return true; |
3b12939d | 5058 | } |
f4836ba9 PA |
5059 | } |
5060 | ||
5061 | /* Otherwise, if we were running a synchronous execution command, we | |
5062 | may need to cancel it and give the user back the terminal. | |
5063 | ||
5064 | In non-stop mode, the target can't tell whether we've already | |
5065 | consumed previous stop events, so it can end up sending us a | |
5066 | no-resumed event like so: | |
5067 | ||
5068 | #0 - thread 1 is left stopped | |
5069 | ||
5070 | #1 - thread 2 is resumed and hits breakpoint | |
dda83cd7 | 5071 | -> TARGET_WAITKIND_STOPPED |
f4836ba9 PA |
5072 | |
5073 | #2 - thread 3 is resumed and exits | |
dda83cd7 | 5074 | this is the last resumed thread, so |
f4836ba9 PA |
5075 | -> TARGET_WAITKIND_NO_RESUMED |
5076 | ||
5077 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
dda83cd7 | 5078 | it. |
f4836ba9 PA |
5079 | |
5080 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
dda83cd7 | 5081 | thread 2 is now resumed, so the event should be ignored. |
f4836ba9 PA |
5082 | |
5083 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
5084 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
5085 | event. But it could be that the event meant that thread 2 itself | |
5086 | (or whatever other thread was the last resumed thread) exited. | |
5087 | ||
5088 | To address this we refresh the thread list and check whether we | |
5089 | have resumed threads _now_. In the example above, this removes | |
5090 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
5091 | ignore this event. If we find no thread resumed, then we cancel | |
7d3badc6 PA |
5092 | the synchronous command and show "no unwaited-for " to the |
5093 | user. */ | |
f4836ba9 | 5094 | |
d6cc5d98 | 5095 | inferior *curr_inf = current_inferior (); |
7d3badc6 | 5096 | |
d6cc5d98 PA |
5097 | scoped_restore_current_thread restore_thread; |
5098 | ||
5099 | for (auto *target : all_non_exited_process_targets ()) | |
5100 | { | |
5101 | switch_to_target_no_thread (target); | |
5102 | update_thread_list (); | |
5103 | } | |
5104 | ||
5105 | /* If: | |
5106 | ||
5107 | - the current target has no thread executing, and | |
5108 | - the current inferior is native, and | |
5109 | - the current inferior is the one which has the terminal, and | |
5110 | - we did nothing, | |
5111 | ||
5112 | then a Ctrl-C from this point on would remain stuck in the | |
5113 | kernel, until a thread resumes and dequeues it. That would | |
5114 | result in the GDB CLI not reacting to Ctrl-C, not able to | |
5115 | interrupt the program. To address this, if the current inferior | |
5116 | no longer has any thread executing, we give the terminal to some | |
5117 | other inferior that has at least one thread executing. */ | |
5118 | bool swap_terminal = true; | |
5119 | ||
5120 | /* Whether to ignore this TARGET_WAITKIND_NO_RESUMED event, or | |
5121 | whether to report it to the user. */ | |
5122 | bool ignore_event = false; | |
7d3badc6 PA |
5123 | |
5124 | for (thread_info *thread : all_non_exited_threads ()) | |
f4836ba9 | 5125 | { |
d6cc5d98 PA |
5126 | if (swap_terminal && thread->executing) |
5127 | { | |
5128 | if (thread->inf != curr_inf) | |
5129 | { | |
5130 | target_terminal::ours (); | |
5131 | ||
5132 | switch_to_thread (thread); | |
5133 | target_terminal::inferior (); | |
5134 | } | |
5135 | swap_terminal = false; | |
5136 | } | |
5137 | ||
5138 | if (!ignore_event | |
1edb66d8 | 5139 | && (thread->executing || thread->has_pending_waitstatus ())) |
f4836ba9 | 5140 | { |
7d3badc6 PA |
5141 | /* Either there were no unwaited-for children left in the |
5142 | target at some point, but there are now, or some target | |
5143 | other than the eventing one has unwaited-for children | |
5144 | left. Just ignore. */ | |
1eb8556f SM |
5145 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED " |
5146 | "(ignoring: found resumed)"); | |
d6cc5d98 PA |
5147 | |
5148 | ignore_event = true; | |
f4836ba9 | 5149 | } |
d6cc5d98 PA |
5150 | |
5151 | if (ignore_event && !swap_terminal) | |
5152 | break; | |
5153 | } | |
5154 | ||
5155 | if (ignore_event) | |
5156 | { | |
5157 | switch_to_inferior_no_thread (curr_inf); | |
5158 | prepare_to_wait (ecs); | |
c4464ade | 5159 | return true; |
f4836ba9 PA |
5160 | } |
5161 | ||
5162 | /* Go ahead and report the event. */ | |
c4464ade | 5163 | return false; |
f4836ba9 PA |
5164 | } |
5165 | ||
05ba8510 PA |
5166 | /* Given an execution control state that has been freshly filled in by |
5167 | an event from the inferior, figure out what it means and take | |
5168 | appropriate action. | |
5169 | ||
5170 | The alternatives are: | |
5171 | ||
22bcd14b | 5172 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5173 | debugger. |
5174 | ||
5175 | 2) keep_going and return; to wait for the next event (set | |
5176 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5177 | once). */ | |
c906108c | 5178 | |
ec9499be | 5179 | static void |
595915c1 | 5180 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5181 | { |
595915c1 TT |
5182 | /* Make sure that all temporary struct value objects that were |
5183 | created during the handling of the event get deleted at the | |
5184 | end. */ | |
5185 | scoped_value_mark free_values; | |
5186 | ||
1eb8556f | 5187 | infrun_debug_printf ("%s", target_waitstatus_to_string (&ecs->ws).c_str ()); |
c29705b7 | 5188 | |
28736962 PA |
5189 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
5190 | { | |
5191 | /* We had an event in the inferior, but we are not interested in | |
5192 | handling it at this level. The lower layers have already | |
5193 | done what needs to be done, if anything. | |
5194 | ||
5195 | One of the possible circumstances for this is when the | |
5196 | inferior produces output for the console. The inferior has | |
5197 | not stopped, and we are ignoring the event. Another possible | |
5198 | circumstance is any event which the lower level knows will be | |
5199 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5200 | prepare_to_wait (ecs); |
5201 | return; | |
5202 | } | |
5203 | ||
65706a29 PA |
5204 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
5205 | { | |
65706a29 PA |
5206 | prepare_to_wait (ecs); |
5207 | return; | |
5208 | } | |
5209 | ||
0e5bf2a8 | 5210 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5211 | && handle_no_resumed (ecs)) |
5212 | return; | |
0e5bf2a8 | 5213 | |
5b6d1e4f PA |
5214 | /* Cache the last target/ptid/waitstatus. */ |
5215 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5216 | |
ca005067 | 5217 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5218 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5219 | |
0e5bf2a8 PA |
5220 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
5221 | { | |
5222 | /* No unwaited-for children left. IOW, all resumed children | |
5223 | have exited. */ | |
c4464ade | 5224 | stop_print_frame = false; |
22bcd14b | 5225 | stop_waiting (ecs); |
0e5bf2a8 PA |
5226 | return; |
5227 | } | |
5228 | ||
8c90c137 | 5229 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 5230 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 | 5231 | { |
5b6d1e4f | 5232 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5233 | /* If it's a new thread, add it to the thread database. */ |
5234 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5235 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5236 | |
5237 | /* Disable range stepping. If the next step request could use a | |
5238 | range, this will be end up re-enabled then. */ | |
5239 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5240 | } |
88ed393a JK |
5241 | |
5242 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 5243 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
5244 | |
5245 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5246 | reinit_frame_cache (); | |
5247 | ||
28736962 PA |
5248 | breakpoint_retire_moribund (); |
5249 | ||
2b009048 DJ |
5250 | /* First, distinguish signals caused by the debugger from signals |
5251 | that have to do with the program's own actions. Note that | |
5252 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5253 | on the operating system version. Here we detect when a SIGILL or | |
5254 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5255 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5256 | when we're trying to execute a breakpoint instruction on a | |
5257 | non-executable stack. This happens for call dummy breakpoints | |
5258 | for architectures like SPARC that place call dummies on the | |
5259 | stack. */ | |
2b009048 | 5260 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
5261 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
5262 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
5263 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 5264 | { |
00431a78 | 5265 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5266 | |
a01bda52 | 5267 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5268 | regcache_read_pc (regcache))) |
5269 | { | |
1eb8556f | 5270 | infrun_debug_printf ("Treating signal as SIGTRAP"); |
a493e3e2 | 5271 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 5272 | } |
2b009048 DJ |
5273 | } |
5274 | ||
293b3ebc | 5275 | mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws); |
8c90c137 | 5276 | |
488f131b JB |
5277 | switch (ecs->ws.kind) |
5278 | { | |
5279 | case TARGET_WAITKIND_LOADED: | |
72d383bb SM |
5280 | { |
5281 | context_switch (ecs); | |
5282 | /* Ignore gracefully during startup of the inferior, as it might | |
5283 | be the shell which has just loaded some objects, otherwise | |
5284 | add the symbols for the newly loaded objects. Also ignore at | |
5285 | the beginning of an attach or remote session; we will query | |
5286 | the full list of libraries once the connection is | |
5287 | established. */ | |
5288 | ||
5289 | stop_kind stop_soon = get_inferior_stop_soon (ecs); | |
5290 | if (stop_soon == NO_STOP_QUIETLY) | |
5291 | { | |
5292 | struct regcache *regcache; | |
edcc5120 | 5293 | |
72d383bb | 5294 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 | 5295 | |
72d383bb | 5296 | handle_solib_event (); |
ab04a2af | 5297 | |
72d383bb SM |
5298 | ecs->event_thread->control.stop_bpstat |
5299 | = bpstat_stop_status (regcache->aspace (), | |
1edb66d8 | 5300 | ecs->event_thread->stop_pc (), |
72d383bb | 5301 | ecs->event_thread, &ecs->ws); |
c65d6b55 | 5302 | |
72d383bb | 5303 | if (handle_stop_requested (ecs)) |
94c57d6a | 5304 | return; |
488f131b | 5305 | |
72d383bb SM |
5306 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
5307 | { | |
5308 | /* A catchpoint triggered. */ | |
5309 | process_event_stop_test (ecs); | |
5310 | return; | |
5311 | } | |
55409f9d | 5312 | |
72d383bb SM |
5313 | /* If requested, stop when the dynamic linker notifies |
5314 | gdb of events. This allows the user to get control | |
5315 | and place breakpoints in initializer routines for | |
5316 | dynamically loaded objects (among other things). */ | |
1edb66d8 | 5317 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
72d383bb SM |
5318 | if (stop_on_solib_events) |
5319 | { | |
5320 | /* Make sure we print "Stopped due to solib-event" in | |
5321 | normal_stop. */ | |
5322 | stop_print_frame = true; | |
b0f4b84b | 5323 | |
72d383bb SM |
5324 | stop_waiting (ecs); |
5325 | return; | |
5326 | } | |
5327 | } | |
b0f4b84b | 5328 | |
72d383bb SM |
5329 | /* If we are skipping through a shell, or through shared library |
5330 | loading that we aren't interested in, resume the program. If | |
5331 | we're running the program normally, also resume. */ | |
5332 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
5333 | { | |
5334 | /* Loading of shared libraries might have changed breakpoint | |
5335 | addresses. Make sure new breakpoints are inserted. */ | |
5336 | if (stop_soon == NO_STOP_QUIETLY) | |
5337 | insert_breakpoints (); | |
5338 | resume (GDB_SIGNAL_0); | |
5339 | prepare_to_wait (ecs); | |
5340 | return; | |
5341 | } | |
5c09a2c5 | 5342 | |
72d383bb SM |
5343 | /* But stop if we're attaching or setting up a remote |
5344 | connection. */ | |
5345 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5346 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5347 | { | |
5348 | infrun_debug_printf ("quietly stopped"); | |
5349 | stop_waiting (ecs); | |
5350 | return; | |
5351 | } | |
5352 | ||
5353 | internal_error (__FILE__, __LINE__, | |
5354 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
5355 | } | |
c5aa993b | 5356 | |
488f131b | 5357 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5358 | if (handle_stop_requested (ecs)) |
5359 | return; | |
00431a78 | 5360 | context_switch (ecs); |
64ce06e4 | 5361 | resume (GDB_SIGNAL_0); |
488f131b JB |
5362 | prepare_to_wait (ecs); |
5363 | return; | |
c5aa993b | 5364 | |
65706a29 | 5365 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5366 | if (handle_stop_requested (ecs)) |
5367 | return; | |
00431a78 | 5368 | context_switch (ecs); |
65706a29 PA |
5369 | if (!switch_back_to_stepped_thread (ecs)) |
5370 | keep_going (ecs); | |
5371 | return; | |
5372 | ||
488f131b | 5373 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5374 | case TARGET_WAITKIND_SIGNALLED: |
18493a00 PA |
5375 | { |
5376 | /* Depending on the system, ecs->ptid may point to a thread or | |
5377 | to a process. On some targets, target_mourn_inferior may | |
5378 | need to have access to the just-exited thread. That is the | |
5379 | case of GNU/Linux's "checkpoint" support, for example. | |
5380 | Call the switch_to_xxx routine as appropriate. */ | |
5381 | thread_info *thr = find_thread_ptid (ecs->target, ecs->ptid); | |
5382 | if (thr != nullptr) | |
5383 | switch_to_thread (thr); | |
5384 | else | |
5385 | { | |
5386 | inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); | |
5387 | switch_to_inferior_no_thread (inf); | |
5388 | } | |
5389 | } | |
6c95b8df | 5390 | handle_vfork_child_exec_or_exit (0); |
223ffa71 | 5391 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5392 | |
0c557179 SDJ |
5393 | /* Clearing any previous state of convenience variables. */ |
5394 | clear_exit_convenience_vars (); | |
5395 | ||
940c3c06 PA |
5396 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5397 | { | |
5398 | /* Record the exit code in the convenience variable $_exitcode, so | |
5399 | that the user can inspect this again later. */ | |
5400 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5401 | (LONGEST) ecs->ws.value.integer); | |
5402 | ||
5403 | /* Also record this in the inferior itself. */ | |
5404 | current_inferior ()->has_exit_code = 1; | |
5405 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5406 | |
98eb56a4 PA |
5407 | /* Support the --return-child-result option. */ |
5408 | return_child_result_value = ecs->ws.value.integer; | |
5409 | ||
76727919 | 5410 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
5411 | } |
5412 | else | |
0c557179 | 5413 | { |
00431a78 | 5414 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5415 | |
5416 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5417 | { | |
5418 | /* Set the value of the internal variable $_exitsignal, | |
5419 | which holds the signal uncaught by the inferior. */ | |
5420 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5421 | gdbarch_gdb_signal_to_target (gdbarch, | |
5422 | ecs->ws.value.sig)); | |
5423 | } | |
5424 | else | |
5425 | { | |
5426 | /* We don't have access to the target's method used for | |
5427 | converting between signal numbers (GDB's internal | |
5428 | representation <-> target's representation). | |
5429 | Therefore, we cannot do a good job at displaying this | |
5430 | information to the user. It's better to just warn | |
5431 | her about it (if infrun debugging is enabled), and | |
5432 | give up. */ | |
1eb8556f SM |
5433 | infrun_debug_printf ("Cannot fill $_exitsignal with the correct " |
5434 | "signal number."); | |
0c557179 SDJ |
5435 | } |
5436 | ||
76727919 | 5437 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 5438 | } |
8cf64490 | 5439 | |
488f131b | 5440 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5441 | target_mourn_inferior (inferior_ptid); |
c4464ade | 5442 | stop_print_frame = false; |
22bcd14b | 5443 | stop_waiting (ecs); |
488f131b | 5444 | return; |
c5aa993b | 5445 | |
488f131b | 5446 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5447 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5448 | /* Check whether the inferior is displaced stepping. */ |
5449 | { | |
00431a78 | 5450 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5451 | struct gdbarch *gdbarch = regcache->arch (); |
c0aba012 | 5452 | inferior *parent_inf = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 | 5453 | |
aeeb758d JB |
5454 | /* If this is a fork (child gets its own address space copy) |
5455 | and some displaced step buffers were in use at the time of | |
5456 | the fork, restore the displaced step buffer bytes in the | |
5457 | child process. | |
5458 | ||
5459 | Architectures which support displaced stepping and fork | |
5460 | events must supply an implementation of | |
5461 | gdbarch_displaced_step_restore_all_in_ptid. This is not | |
5462 | enforced during gdbarch validation to support architectures | |
5463 | which support displaced stepping but not forks. */ | |
5464 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED | |
5465 | && gdbarch_supports_displaced_stepping (gdbarch)) | |
187b041e SM |
5466 | gdbarch_displaced_step_restore_all_in_ptid |
5467 | (gdbarch, parent_inf, ecs->ws.value.related_pid); | |
c0aba012 SM |
5468 | |
5469 | /* If displaced stepping is supported, and thread ecs->ptid is | |
5470 | displaced stepping. */ | |
00431a78 | 5471 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 | 5472 | { |
e2d96639 YQ |
5473 | struct regcache *child_regcache; |
5474 | CORE_ADDR parent_pc; | |
5475 | ||
5476 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
5477 | indicating that the displaced stepping of syscall instruction | |
5478 | has been done. Perform cleanup for parent process here. Note | |
5479 | that this operation also cleans up the child process for vfork, | |
5480 | because their pages are shared. */ | |
7def77a1 | 5481 | displaced_step_finish (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5482 | /* Start a new step-over in another thread if there's one |
5483 | that needs it. */ | |
5484 | start_step_over (); | |
e2d96639 | 5485 | |
e2d96639 YQ |
5486 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5487 | the child's PC is also within the scratchpad. Set the child's PC | |
5488 | to the parent's PC value, which has already been fixed up. | |
5489 | FIXME: we use the parent's aspace here, although we're touching | |
5490 | the child, because the child hasn't been added to the inferior | |
5491 | list yet at this point. */ | |
5492 | ||
5493 | child_regcache | |
5b6d1e4f PA |
5494 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
5495 | ecs->ws.value.related_pid, | |
e2d96639 YQ |
5496 | gdbarch, |
5497 | parent_inf->aspace); | |
5498 | /* Read PC value of parent process. */ | |
5499 | parent_pc = regcache_read_pc (regcache); | |
5500 | ||
136821d9 SM |
5501 | displaced_debug_printf ("write child pc from %s to %s", |
5502 | paddress (gdbarch, | |
5503 | regcache_read_pc (child_regcache)), | |
5504 | paddress (gdbarch, parent_pc)); | |
e2d96639 YQ |
5505 | |
5506 | regcache_write_pc (child_regcache, parent_pc); | |
5507 | } | |
5508 | } | |
5509 | ||
00431a78 | 5510 | context_switch (ecs); |
5a2901d9 | 5511 | |
b242c3c2 PA |
5512 | /* Immediately detach breakpoints from the child before there's |
5513 | any chance of letting the user delete breakpoints from the | |
5514 | breakpoint lists. If we don't do this early, it's easy to | |
5515 | leave left over traps in the child, vis: "break foo; catch | |
5516 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5517 | the fork on the last `continue', and by that time the | |
5518 | breakpoint at "foo" is long gone from the breakpoint table. | |
5519 | If we vforked, then we don't need to unpatch here, since both | |
5520 | parent and child are sharing the same memory pages; we'll | |
5521 | need to unpatch at follow/detach time instead to be certain | |
5522 | that new breakpoints added between catchpoint hit time and | |
5523 | vfork follow are detached. */ | |
5524 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5525 | { | |
b242c3c2 PA |
5526 | /* This won't actually modify the breakpoint list, but will |
5527 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5528 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5529 | } |
5530 | ||
34b7e8a6 | 5531 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5532 | |
e58b0e63 PA |
5533 | /* In case the event is caught by a catchpoint, remember that |
5534 | the event is to be followed at the next resume of the thread, | |
5535 | and not immediately. */ | |
5536 | ecs->event_thread->pending_follow = ecs->ws; | |
5537 | ||
1edb66d8 SM |
5538 | ecs->event_thread->set_stop_pc |
5539 | (regcache_read_pc (get_thread_regcache (ecs->event_thread))); | |
675bf4cb | 5540 | |
16c381f0 | 5541 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5542 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
1edb66d8 | 5543 | ecs->event_thread->stop_pc (), |
f2ffa92b | 5544 | ecs->event_thread, &ecs->ws); |
675bf4cb | 5545 | |
c65d6b55 PA |
5546 | if (handle_stop_requested (ecs)) |
5547 | return; | |
5548 | ||
ce12b012 PA |
5549 | /* If no catchpoint triggered for this, then keep going. Note |
5550 | that we're interested in knowing the bpstat actually causes a | |
5551 | stop, not just if it may explain the signal. Software | |
5552 | watchpoints, for example, always appear in the bpstat. */ | |
5553 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5554 | { |
5ab2fbf1 | 5555 | bool follow_child |
3e43a32a | 5556 | = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 5557 | |
1edb66d8 | 5558 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
e58b0e63 | 5559 | |
5b6d1e4f PA |
5560 | process_stratum_target *targ |
5561 | = ecs->event_thread->inf->process_target (); | |
5562 | ||
5ab2fbf1 | 5563 | bool should_resume = follow_fork (); |
e58b0e63 | 5564 | |
5b6d1e4f PA |
5565 | /* Note that one of these may be an invalid pointer, |
5566 | depending on detach_fork. */ | |
00431a78 | 5567 | thread_info *parent = ecs->event_thread; |
5b6d1e4f PA |
5568 | thread_info *child |
5569 | = find_thread_ptid (targ, ecs->ws.value.related_pid); | |
6c95b8df | 5570 | |
a2077e25 PA |
5571 | /* At this point, the parent is marked running, and the |
5572 | child is marked stopped. */ | |
5573 | ||
5574 | /* If not resuming the parent, mark it stopped. */ | |
5575 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5576 | parent->set_running (false); |
a2077e25 PA |
5577 | |
5578 | /* If resuming the child, mark it running. */ | |
5579 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5580 | child->set_running (true); |
a2077e25 | 5581 | |
6c95b8df | 5582 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5583 | if (!detach_fork && (non_stop |
5584 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5585 | { |
5586 | if (follow_child) | |
5587 | switch_to_thread (parent); | |
5588 | else | |
5589 | switch_to_thread (child); | |
5590 | ||
5591 | ecs->event_thread = inferior_thread (); | |
5592 | ecs->ptid = inferior_ptid; | |
5593 | keep_going (ecs); | |
5594 | } | |
5595 | ||
5596 | if (follow_child) | |
5597 | switch_to_thread (child); | |
5598 | else | |
5599 | switch_to_thread (parent); | |
5600 | ||
e58b0e63 PA |
5601 | ecs->event_thread = inferior_thread (); |
5602 | ecs->ptid = inferior_ptid; | |
5603 | ||
5604 | if (should_resume) | |
5605 | keep_going (ecs); | |
5606 | else | |
22bcd14b | 5607 | stop_waiting (ecs); |
04e68871 DJ |
5608 | return; |
5609 | } | |
94c57d6a PA |
5610 | process_event_stop_test (ecs); |
5611 | return; | |
488f131b | 5612 | |
6c95b8df PA |
5613 | case TARGET_WAITKIND_VFORK_DONE: |
5614 | /* Done with the shared memory region. Re-insert breakpoints in | |
5615 | the parent, and keep going. */ | |
5616 | ||
00431a78 | 5617 | context_switch (ecs); |
6c95b8df PA |
5618 | |
5619 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5620 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5621 | |
5622 | if (handle_stop_requested (ecs)) | |
5623 | return; | |
5624 | ||
6c95b8df PA |
5625 | /* This also takes care of reinserting breakpoints in the |
5626 | previously locked inferior. */ | |
5627 | keep_going (ecs); | |
5628 | return; | |
5629 | ||
488f131b | 5630 | case TARGET_WAITKIND_EXECD: |
488f131b | 5631 | |
cbd2b4e3 PA |
5632 | /* Note we can't read registers yet (the stop_pc), because we |
5633 | don't yet know the inferior's post-exec architecture. | |
5634 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5635 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5636 | |
6c95b8df PA |
5637 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5638 | handle_vfork_child_exec_or_exit (1); | |
5639 | ||
795e548f | 5640 | /* This causes the eventpoints and symbol table to be reset. |
dda83cd7 SM |
5641 | Must do this now, before trying to determine whether to |
5642 | stop. */ | |
71b43ef8 | 5643 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5644 | |
17d8546e DB |
5645 | /* In follow_exec we may have deleted the original thread and |
5646 | created a new one. Make sure that the event thread is the | |
5647 | execd thread for that case (this is a nop otherwise). */ | |
5648 | ecs->event_thread = inferior_thread (); | |
5649 | ||
1edb66d8 SM |
5650 | ecs->event_thread->set_stop_pc |
5651 | (regcache_read_pc (get_thread_regcache (ecs->event_thread))); | |
ecdc3a72 | 5652 | |
16c381f0 | 5653 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5654 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
1edb66d8 | 5655 | ecs->event_thread->stop_pc (), |
f2ffa92b | 5656 | ecs->event_thread, &ecs->ws); |
795e548f | 5657 | |
71b43ef8 PA |
5658 | /* Note that this may be referenced from inside |
5659 | bpstat_stop_status above, through inferior_has_execd. */ | |
5660 | xfree (ecs->ws.value.execd_pathname); | |
5661 | ecs->ws.value.execd_pathname = NULL; | |
5662 | ||
c65d6b55 PA |
5663 | if (handle_stop_requested (ecs)) |
5664 | return; | |
5665 | ||
04e68871 | 5666 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5667 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5668 | { |
1edb66d8 | 5669 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
04e68871 DJ |
5670 | keep_going (ecs); |
5671 | return; | |
5672 | } | |
94c57d6a PA |
5673 | process_event_stop_test (ecs); |
5674 | return; | |
488f131b | 5675 | |
b4dc5ffa | 5676 | /* Be careful not to try to gather much state about a thread |
dda83cd7 | 5677 | that's in a syscall. It's frequently a losing proposition. */ |
488f131b | 5678 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5679 | /* Getting the current syscall number. */ |
94c57d6a PA |
5680 | if (handle_syscall_event (ecs) == 0) |
5681 | process_event_stop_test (ecs); | |
5682 | return; | |
c906108c | 5683 | |
488f131b | 5684 | /* Before examining the threads further, step this thread to |
dda83cd7 SM |
5685 | get it entirely out of the syscall. (We get notice of the |
5686 | event when the thread is just on the verge of exiting a | |
5687 | syscall. Stepping one instruction seems to get it back | |
5688 | into user code.) */ | |
488f131b | 5689 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5690 | if (handle_syscall_event (ecs) == 0) |
5691 | process_event_stop_test (ecs); | |
5692 | return; | |
c906108c | 5693 | |
488f131b | 5694 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5695 | handle_signal_stop (ecs); |
5696 | return; | |
c906108c | 5697 | |
b2175913 MS |
5698 | case TARGET_WAITKIND_NO_HISTORY: |
5699 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5700 | |
d1988021 | 5701 | /* Switch to the stopped thread. */ |
00431a78 | 5702 | context_switch (ecs); |
1eb8556f | 5703 | infrun_debug_printf ("stopped"); |
d1988021 | 5704 | |
34b7e8a6 | 5705 | delete_just_stopped_threads_single_step_breakpoints (); |
1edb66d8 SM |
5706 | ecs->event_thread->set_stop_pc |
5707 | (regcache_read_pc (get_thread_regcache (inferior_thread ()))); | |
c65d6b55 PA |
5708 | |
5709 | if (handle_stop_requested (ecs)) | |
5710 | return; | |
5711 | ||
76727919 | 5712 | gdb::observers::no_history.notify (); |
22bcd14b | 5713 | stop_waiting (ecs); |
b2175913 | 5714 | return; |
488f131b | 5715 | } |
4f5d7f63 PA |
5716 | } |
5717 | ||
372316f1 PA |
5718 | /* Restart threads back to what they were trying to do back when we |
5719 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5720 | ignored. */ | |
4d9d9d04 PA |
5721 | |
5722 | static void | |
372316f1 PA |
5723 | restart_threads (struct thread_info *event_thread) |
5724 | { | |
372316f1 PA |
5725 | /* In case the instruction just stepped spawned a new thread. */ |
5726 | update_thread_list (); | |
5727 | ||
08036331 | 5728 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5729 | { |
ac7d717c PA |
5730 | if (tp->inf->detaching) |
5731 | { | |
5732 | infrun_debug_printf ("restart threads: [%s] inferior detaching", | |
5733 | target_pid_to_str (tp->ptid).c_str ()); | |
5734 | continue; | |
5735 | } | |
5736 | ||
f3f8ece4 PA |
5737 | switch_to_thread_no_regs (tp); |
5738 | ||
372316f1 PA |
5739 | if (tp == event_thread) |
5740 | { | |
1eb8556f SM |
5741 | infrun_debug_printf ("restart threads: [%s] is event thread", |
5742 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5743 | continue; |
5744 | } | |
5745 | ||
5746 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5747 | { | |
1eb8556f SM |
5748 | infrun_debug_printf ("restart threads: [%s] not meant to be running", |
5749 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5750 | continue; |
5751 | } | |
5752 | ||
7846f3aa | 5753 | if (tp->resumed ()) |
372316f1 | 5754 | { |
1eb8556f SM |
5755 | infrun_debug_printf ("restart threads: [%s] resumed", |
5756 | target_pid_to_str (tp->ptid).c_str ()); | |
1edb66d8 | 5757 | gdb_assert (tp->executing || tp->has_pending_waitstatus ()); |
372316f1 PA |
5758 | continue; |
5759 | } | |
5760 | ||
5761 | if (thread_is_in_step_over_chain (tp)) | |
5762 | { | |
1eb8556f SM |
5763 | infrun_debug_printf ("restart threads: [%s] needs step-over", |
5764 | target_pid_to_str (tp->ptid).c_str ()); | |
7846f3aa | 5765 | gdb_assert (!tp->resumed ()); |
372316f1 PA |
5766 | continue; |
5767 | } | |
5768 | ||
5769 | ||
1edb66d8 | 5770 | if (tp->has_pending_waitstatus ()) |
372316f1 | 5771 | { |
1eb8556f SM |
5772 | infrun_debug_printf ("restart threads: [%s] has pending status", |
5773 | target_pid_to_str (tp->ptid).c_str ()); | |
7846f3aa | 5774 | tp->set_resumed (true); |
372316f1 PA |
5775 | continue; |
5776 | } | |
5777 | ||
c65d6b55 PA |
5778 | gdb_assert (!tp->stop_requested); |
5779 | ||
372316f1 PA |
5780 | /* If some thread needs to start a step-over at this point, it |
5781 | should still be in the step-over queue, and thus skipped | |
5782 | above. */ | |
5783 | if (thread_still_needs_step_over (tp)) | |
5784 | { | |
5785 | internal_error (__FILE__, __LINE__, | |
5786 | "thread [%s] needs a step-over, but not in " | |
5787 | "step-over queue\n", | |
a068643d | 5788 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5789 | } |
5790 | ||
5791 | if (currently_stepping (tp)) | |
5792 | { | |
1eb8556f SM |
5793 | infrun_debug_printf ("restart threads: [%s] was stepping", |
5794 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5795 | keep_going_stepped_thread (tp); |
5796 | } | |
5797 | else | |
5798 | { | |
5799 | struct execution_control_state ecss; | |
5800 | struct execution_control_state *ecs = &ecss; | |
5801 | ||
1eb8556f SM |
5802 | infrun_debug_printf ("restart threads: [%s] continuing", |
5803 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 5804 | reset_ecs (ecs, tp); |
00431a78 | 5805 | switch_to_thread (tp); |
372316f1 PA |
5806 | keep_going_pass_signal (ecs); |
5807 | } | |
5808 | } | |
5809 | } | |
5810 | ||
5811 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5812 | a pending waitstatus. */ | |
5813 | ||
5814 | static int | |
5815 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5816 | void *arg) | |
5817 | { | |
1edb66d8 | 5818 | return tp->resumed () && tp->has_pending_waitstatus (); |
372316f1 PA |
5819 | } |
5820 | ||
5821 | /* Called when we get an event that may finish an in-line or | |
5822 | out-of-line (displaced stepping) step-over started previously. | |
5823 | Return true if the event is processed and we should go back to the | |
5824 | event loop; false if the caller should continue processing the | |
5825 | event. */ | |
5826 | ||
5827 | static int | |
4d9d9d04 PA |
5828 | finish_step_over (struct execution_control_state *ecs) |
5829 | { | |
1edb66d8 | 5830 | displaced_step_finish (ecs->event_thread, ecs->event_thread->stop_signal ()); |
4d9d9d04 | 5831 | |
c4464ade | 5832 | bool had_step_over_info = step_over_info_valid_p (); |
372316f1 PA |
5833 | |
5834 | if (had_step_over_info) | |
4d9d9d04 PA |
5835 | { |
5836 | /* If we're stepping over a breakpoint with all threads locked, | |
5837 | then only the thread that was stepped should be reporting | |
5838 | back an event. */ | |
5839 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5840 | ||
c65d6b55 | 5841 | clear_step_over_info (); |
4d9d9d04 PA |
5842 | } |
5843 | ||
fbea99ea | 5844 | if (!target_is_non_stop_p ()) |
372316f1 | 5845 | return 0; |
4d9d9d04 PA |
5846 | |
5847 | /* Start a new step-over in another thread if there's one that | |
5848 | needs it. */ | |
5849 | start_step_over (); | |
372316f1 PA |
5850 | |
5851 | /* If we were stepping over a breakpoint before, and haven't started | |
5852 | a new in-line step-over sequence, then restart all other threads | |
5853 | (except the event thread). We can't do this in all-stop, as then | |
5854 | e.g., we wouldn't be able to issue any other remote packet until | |
5855 | these other threads stop. */ | |
5856 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5857 | { | |
5858 | struct thread_info *pending; | |
5859 | ||
5860 | /* If we only have threads with pending statuses, the restart | |
5861 | below won't restart any thread and so nothing re-inserts the | |
5862 | breakpoint we just stepped over. But we need it inserted | |
5863 | when we later process the pending events, otherwise if | |
5864 | another thread has a pending event for this breakpoint too, | |
5865 | we'd discard its event (because the breakpoint that | |
5866 | originally caused the event was no longer inserted). */ | |
00431a78 | 5867 | context_switch (ecs); |
372316f1 PA |
5868 | insert_breakpoints (); |
5869 | ||
5870 | restart_threads (ecs->event_thread); | |
5871 | ||
5872 | /* If we have events pending, go through handle_inferior_event | |
5873 | again, picking up a pending event at random. This avoids | |
5874 | thread starvation. */ | |
5875 | ||
5876 | /* But not if we just stepped over a watchpoint in order to let | |
5877 | the instruction execute so we can evaluate its expression. | |
5878 | The set of watchpoints that triggered is recorded in the | |
5879 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5880 | If we processed another event first, that other event could | |
5881 | clobber this info. */ | |
5882 | if (ecs->event_thread->stepping_over_watchpoint) | |
5883 | return 0; | |
5884 | ||
5885 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5886 | NULL); | |
5887 | if (pending != NULL) | |
5888 | { | |
5889 | struct thread_info *tp = ecs->event_thread; | |
5890 | struct regcache *regcache; | |
5891 | ||
1eb8556f SM |
5892 | infrun_debug_printf ("found resumed threads with " |
5893 | "pending events, saving status"); | |
372316f1 PA |
5894 | |
5895 | gdb_assert (pending != tp); | |
5896 | ||
5897 | /* Record the event thread's event for later. */ | |
5898 | save_waitstatus (tp, &ecs->ws); | |
5899 | /* This was cleared early, by handle_inferior_event. Set it | |
5900 | so this pending event is considered by | |
5901 | do_target_wait. */ | |
7846f3aa | 5902 | tp->set_resumed (true); |
372316f1 PA |
5903 | |
5904 | gdb_assert (!tp->executing); | |
5905 | ||
00431a78 | 5906 | regcache = get_thread_regcache (tp); |
1edb66d8 | 5907 | tp->set_stop_pc (regcache_read_pc (regcache)); |
372316f1 | 5908 | |
1eb8556f SM |
5909 | infrun_debug_printf ("saved stop_pc=%s for %s " |
5910 | "(currently_stepping=%d)", | |
1edb66d8 | 5911 | paddress (target_gdbarch (), tp->stop_pc ()), |
1eb8556f SM |
5912 | target_pid_to_str (tp->ptid).c_str (), |
5913 | currently_stepping (tp)); | |
372316f1 PA |
5914 | |
5915 | /* This in-line step-over finished; clear this so we won't | |
5916 | start a new one. This is what handle_signal_stop would | |
5917 | do, if we returned false. */ | |
5918 | tp->stepping_over_breakpoint = 0; | |
5919 | ||
5920 | /* Wake up the event loop again. */ | |
5921 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5922 | ||
5923 | prepare_to_wait (ecs); | |
5924 | return 1; | |
5925 | } | |
5926 | } | |
5927 | ||
5928 | return 0; | |
4d9d9d04 PA |
5929 | } |
5930 | ||
4f5d7f63 PA |
5931 | /* Come here when the program has stopped with a signal. */ |
5932 | ||
5933 | static void | |
5934 | handle_signal_stop (struct execution_control_state *ecs) | |
5935 | { | |
5936 | struct frame_info *frame; | |
5937 | struct gdbarch *gdbarch; | |
5938 | int stopped_by_watchpoint; | |
5939 | enum stop_kind stop_soon; | |
5940 | int random_signal; | |
c906108c | 5941 | |
f0407826 DE |
5942 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5943 | ||
1edb66d8 | 5944 | ecs->event_thread->set_stop_signal (ecs->ws.value.sig); |
c65d6b55 | 5945 | |
f0407826 DE |
5946 | /* Do we need to clean up the state of a thread that has |
5947 | completed a displaced single-step? (Doing so usually affects | |
5948 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5949 | if (finish_step_over (ecs)) |
5950 | return; | |
f0407826 DE |
5951 | |
5952 | /* If we either finished a single-step or hit a breakpoint, but | |
5953 | the user wanted this thread to be stopped, pretend we got a | |
5954 | SIG0 (generic unsignaled stop). */ | |
5955 | if (ecs->event_thread->stop_requested | |
1edb66d8 SM |
5956 | && ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP) |
5957 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
237fc4c9 | 5958 | |
1edb66d8 SM |
5959 | ecs->event_thread->set_stop_pc |
5960 | (regcache_read_pc (get_thread_regcache (ecs->event_thread))); | |
488f131b | 5961 | |
2ab76a18 PA |
5962 | context_switch (ecs); |
5963 | ||
5964 | if (deprecated_context_hook) | |
5965 | deprecated_context_hook (ecs->event_thread->global_num); | |
5966 | ||
527159b7 | 5967 | if (debug_infrun) |
237fc4c9 | 5968 | { |
00431a78 | 5969 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 5970 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 5971 | |
1edb66d8 SM |
5972 | infrun_debug_printf |
5973 | ("stop_pc=%s", paddress (reg_gdbarch, ecs->event_thread->stop_pc ())); | |
d92524f1 | 5974 | if (target_stopped_by_watchpoint ()) |
237fc4c9 | 5975 | { |
dda83cd7 | 5976 | CORE_ADDR addr; |
abbb1732 | 5977 | |
1eb8556f | 5978 | infrun_debug_printf ("stopped by watchpoint"); |
237fc4c9 | 5979 | |
328d42d8 SM |
5980 | if (target_stopped_data_address (current_inferior ()->top_target (), |
5981 | &addr)) | |
1eb8556f | 5982 | infrun_debug_printf ("stopped data address=%s", |
dda83cd7 SM |
5983 | paddress (reg_gdbarch, addr)); |
5984 | else | |
1eb8556f | 5985 | infrun_debug_printf ("(no data address available)"); |
237fc4c9 PA |
5986 | } |
5987 | } | |
527159b7 | 5988 | |
36fa8042 PA |
5989 | /* This is originated from start_remote(), start_inferior() and |
5990 | shared libraries hook functions. */ | |
00431a78 | 5991 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
5992 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
5993 | { | |
1eb8556f | 5994 | infrun_debug_printf ("quietly stopped"); |
c4464ade | 5995 | stop_print_frame = true; |
22bcd14b | 5996 | stop_waiting (ecs); |
36fa8042 PA |
5997 | return; |
5998 | } | |
5999 | ||
36fa8042 PA |
6000 | /* This originates from attach_command(). We need to overwrite |
6001 | the stop_signal here, because some kernels don't ignore a | |
6002 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
6003 | See more comments in inferior.h. On the other hand, if we | |
6004 | get a non-SIGSTOP, report it to the user - assume the backend | |
6005 | will handle the SIGSTOP if it should show up later. | |
6006 | ||
6007 | Also consider that the attach is complete when we see a | |
6008 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
6009 | target extended-remote report it instead of a SIGSTOP | |
6010 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
6011 | signal, so this is no exception. | |
6012 | ||
6013 | Also consider that the attach is complete when we see a | |
6014 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
6015 | the target to stop all threads of the inferior, in case the | |
6016 | low level attach operation doesn't stop them implicitly. If | |
6017 | they weren't stopped implicitly, then the stub will report a | |
6018 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
6019 | other than GDB's request. */ | |
6020 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
1edb66d8 SM |
6021 | && (ecs->event_thread->stop_signal () == GDB_SIGNAL_STOP |
6022 | || ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP | |
6023 | || ecs->event_thread->stop_signal () == GDB_SIGNAL_0)) | |
36fa8042 | 6024 | { |
c4464ade | 6025 | stop_print_frame = true; |
22bcd14b | 6026 | stop_waiting (ecs); |
1edb66d8 | 6027 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); |
36fa8042 PA |
6028 | return; |
6029 | } | |
6030 | ||
568d6575 UW |
6031 | /* At this point, get hold of the now-current thread's frame. */ |
6032 | frame = get_current_frame (); | |
6033 | gdbarch = get_frame_arch (frame); | |
6034 | ||
2adfaa28 | 6035 | /* Pull the single step breakpoints out of the target. */ |
1edb66d8 | 6036 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP) |
488f131b | 6037 | { |
af48d08f | 6038 | struct regcache *regcache; |
af48d08f | 6039 | CORE_ADDR pc; |
2adfaa28 | 6040 | |
00431a78 | 6041 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
6042 | const address_space *aspace = regcache->aspace (); |
6043 | ||
af48d08f | 6044 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 6045 | |
af48d08f PA |
6046 | /* However, before doing so, if this single-step breakpoint was |
6047 | actually for another thread, set this thread up for moving | |
6048 | past it. */ | |
6049 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
6050 | aspace, pc)) | |
6051 | { | |
6052 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 | 6053 | { |
1eb8556f SM |
6054 | infrun_debug_printf ("[%s] hit another thread's single-step " |
6055 | "breakpoint", | |
6056 | target_pid_to_str (ecs->ptid).c_str ()); | |
af48d08f PA |
6057 | ecs->hit_singlestep_breakpoint = 1; |
6058 | } | |
6059 | } | |
6060 | else | |
6061 | { | |
1eb8556f SM |
6062 | infrun_debug_printf ("[%s] hit its single-step breakpoint", |
6063 | target_pid_to_str (ecs->ptid).c_str ()); | |
2adfaa28 | 6064 | } |
488f131b | 6065 | } |
af48d08f | 6066 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 6067 | |
1edb66d8 | 6068 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
963f9c80 PA |
6069 | && ecs->event_thread->control.trap_expected |
6070 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
6071 | stopped_by_watchpoint = 0; |
6072 | else | |
6073 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
6074 | ||
6075 | /* If necessary, step over this watchpoint. We'll be back to display | |
6076 | it in a moment. */ | |
6077 | if (stopped_by_watchpoint | |
9aed480c | 6078 | && (target_have_steppable_watchpoint () |
568d6575 | 6079 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 6080 | { |
488f131b | 6081 | /* At this point, we are stopped at an instruction which has |
dda83cd7 SM |
6082 | attempted to write to a piece of memory under control of |
6083 | a watchpoint. The instruction hasn't actually executed | |
6084 | yet. If we were to evaluate the watchpoint expression | |
6085 | now, we would get the old value, and therefore no change | |
6086 | would seem to have occurred. | |
6087 | ||
6088 | In order to make watchpoints work `right', we really need | |
6089 | to complete the memory write, and then evaluate the | |
6090 | watchpoint expression. We do this by single-stepping the | |
d983da9c DJ |
6091 | target. |
6092 | ||
7f89fd65 | 6093 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
6094 | it. For example, the PA can (with some kernel cooperation) |
6095 | single step over a watchpoint without disabling the watchpoint. | |
6096 | ||
6097 | It is far more common to need to disable a watchpoint to step | |
6098 | the inferior over it. If we have non-steppable watchpoints, | |
6099 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
6100 | disable all watchpoints. |
6101 | ||
6102 | Any breakpoint at PC must also be stepped over -- if there's | |
6103 | one, it will have already triggered before the watchpoint | |
6104 | triggered, and we either already reported it to the user, or | |
6105 | it didn't cause a stop and we called keep_going. In either | |
6106 | case, if there was a breakpoint at PC, we must be trying to | |
6107 | step past it. */ | |
6108 | ecs->event_thread->stepping_over_watchpoint = 1; | |
6109 | keep_going (ecs); | |
488f131b JB |
6110 | return; |
6111 | } | |
6112 | ||
4e1c45ea | 6113 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 6114 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
6115 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
6116 | ecs->event_thread->control.stop_step = 0; | |
c4464ade | 6117 | stop_print_frame = true; |
488f131b | 6118 | stopped_by_random_signal = 0; |
ddfe970e | 6119 | bpstat stop_chain = NULL; |
488f131b | 6120 | |
edb3359d DJ |
6121 | /* Hide inlined functions starting here, unless we just performed stepi or |
6122 | nexti. After stepi and nexti, always show the innermost frame (not any | |
6123 | inline function call sites). */ | |
16c381f0 | 6124 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 6125 | { |
00431a78 PA |
6126 | const address_space *aspace |
6127 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
6128 | |
6129 | /* skip_inline_frames is expensive, so we avoid it if we can | |
6130 | determine that the address is one where functions cannot have | |
6131 | been inlined. This improves performance with inferiors that | |
6132 | load a lot of shared libraries, because the solib event | |
6133 | breakpoint is defined as the address of a function (i.e. not | |
6134 | inline). Note that we have to check the previous PC as well | |
6135 | as the current one to catch cases when we have just | |
6136 | single-stepped off a breakpoint prior to reinstating it. | |
6137 | Note that we're assuming that the code we single-step to is | |
6138 | not inline, but that's not definitive: there's nothing | |
6139 | preventing the event breakpoint function from containing | |
6140 | inlined code, and the single-step ending up there. If the | |
6141 | user had set a breakpoint on that inlined code, the missing | |
6142 | skip_inline_frames call would break things. Fortunately | |
6143 | that's an extremely unlikely scenario. */ | |
f2ffa92b | 6144 | if (!pc_at_non_inline_function (aspace, |
1edb66d8 | 6145 | ecs->event_thread->stop_pc (), |
f2ffa92b | 6146 | &ecs->ws) |
1edb66d8 | 6147 | && !(ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
a210c238 MR |
6148 | && ecs->event_thread->control.trap_expected |
6149 | && pc_at_non_inline_function (aspace, | |
6150 | ecs->event_thread->prev_pc, | |
09ac7c10 | 6151 | &ecs->ws))) |
1c5a993e | 6152 | { |
f2ffa92b | 6153 | stop_chain = build_bpstat_chain (aspace, |
1edb66d8 | 6154 | ecs->event_thread->stop_pc (), |
f2ffa92b | 6155 | &ecs->ws); |
00431a78 | 6156 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
6157 | |
6158 | /* Re-fetch current thread's frame in case that invalidated | |
6159 | the frame cache. */ | |
6160 | frame = get_current_frame (); | |
6161 | gdbarch = get_frame_arch (frame); | |
6162 | } | |
0574c78f | 6163 | } |
edb3359d | 6164 | |
1edb66d8 | 6165 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
16c381f0 | 6166 | && ecs->event_thread->control.trap_expected |
568d6575 | 6167 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6168 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6169 | { |
b50d7442 | 6170 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6171 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6172 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6173 | with a delay slot. It needs to be stepped twice, once for |
6174 | the instruction and once for the delay slot. */ | |
6175 | int step_through_delay | |
568d6575 | 6176 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6177 | |
1eb8556f SM |
6178 | if (step_through_delay) |
6179 | infrun_debug_printf ("step through delay"); | |
6180 | ||
16c381f0 JK |
6181 | if (ecs->event_thread->control.step_range_end == 0 |
6182 | && step_through_delay) | |
3352ef37 AC |
6183 | { |
6184 | /* The user issued a continue when stopped at a breakpoint. | |
6185 | Set up for another trap and get out of here. */ | |
dda83cd7 SM |
6186 | ecs->event_thread->stepping_over_breakpoint = 1; |
6187 | keep_going (ecs); | |
6188 | return; | |
3352ef37 AC |
6189 | } |
6190 | else if (step_through_delay) | |
6191 | { | |
6192 | /* The user issued a step when stopped at a breakpoint. | |
6193 | Maybe we should stop, maybe we should not - the delay | |
6194 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6195 | case, don't decide that here, just set |
6196 | ecs->stepping_over_breakpoint, making sure we | |
6197 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6198 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6199 | } |
6200 | } | |
6201 | ||
ab04a2af TT |
6202 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6203 | handles this event. */ | |
6204 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6205 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
1edb66d8 | 6206 | ecs->event_thread->stop_pc (), |
f2ffa92b | 6207 | ecs->event_thread, &ecs->ws, stop_chain); |
db82e815 | 6208 | |
ab04a2af TT |
6209 | /* Following in case break condition called a |
6210 | function. */ | |
c4464ade | 6211 | stop_print_frame = true; |
73dd234f | 6212 | |
ab04a2af TT |
6213 | /* This is where we handle "moribund" watchpoints. Unlike |
6214 | software breakpoints traps, hardware watchpoint traps are | |
6215 | always distinguishable from random traps. If no high-level | |
6216 | watchpoint is associated with the reported stop data address | |
6217 | anymore, then the bpstat does not explain the signal --- | |
6218 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6219 | set. */ | |
6220 | ||
1edb66d8 | 6221 | if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
47591c29 | 6222 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6223 | GDB_SIGNAL_TRAP) |
ab04a2af | 6224 | && stopped_by_watchpoint) |
1eb8556f SM |
6225 | { |
6226 | infrun_debug_printf ("no user watchpoint explains watchpoint SIGTRAP, " | |
6227 | "ignoring"); | |
6228 | } | |
73dd234f | 6229 | |
bac7d97b | 6230 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6231 | at one stage in the past included checks for an inferior |
6232 | function call's call dummy's return breakpoint. The original | |
6233 | comment, that went with the test, read: | |
03cebad2 | 6234 | |
ab04a2af TT |
6235 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6236 | another signal besides SIGTRAP, so check here as well as | |
6237 | above.'' | |
73dd234f | 6238 | |
ab04a2af TT |
6239 | If someone ever tries to get call dummys on a |
6240 | non-executable stack to work (where the target would stop | |
6241 | with something like a SIGSEGV), then those tests might need | |
6242 | to be re-instated. Given, however, that the tests were only | |
6243 | enabled when momentary breakpoints were not being used, I | |
6244 | suspect that it won't be the case. | |
488f131b | 6245 | |
ab04a2af TT |
6246 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6247 | be necessary for call dummies on a non-executable stack on | |
6248 | SPARC. */ | |
488f131b | 6249 | |
bac7d97b | 6250 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6251 | random_signal |
6252 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
1edb66d8 | 6253 | ecs->event_thread->stop_signal ()); |
bac7d97b | 6254 | |
1cf4d951 PA |
6255 | /* Maybe this was a trap for a software breakpoint that has since |
6256 | been removed. */ | |
6257 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6258 | { | |
5133a315 | 6259 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
1edb66d8 | 6260 | ecs->event_thread->stop_pc ())) |
1cf4d951 PA |
6261 | { |
6262 | struct regcache *regcache; | |
6263 | int decr_pc; | |
6264 | ||
6265 | /* Re-adjust PC to what the program would see if GDB was not | |
6266 | debugging it. */ | |
00431a78 | 6267 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6268 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6269 | if (decr_pc != 0) |
6270 | { | |
07036511 TT |
6271 | gdb::optional<scoped_restore_tmpl<int>> |
6272 | restore_operation_disable; | |
1cf4d951 PA |
6273 | |
6274 | if (record_full_is_used ()) | |
07036511 TT |
6275 | restore_operation_disable.emplace |
6276 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6277 | |
f2ffa92b | 6278 | regcache_write_pc (regcache, |
1edb66d8 | 6279 | ecs->event_thread->stop_pc () + decr_pc); |
1cf4d951 PA |
6280 | } |
6281 | } | |
6282 | else | |
6283 | { | |
6284 | /* A delayed software breakpoint event. Ignore the trap. */ | |
1eb8556f | 6285 | infrun_debug_printf ("delayed software breakpoint trap, ignoring"); |
1cf4d951 PA |
6286 | random_signal = 0; |
6287 | } | |
6288 | } | |
6289 | ||
6290 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6291 | has since been removed. */ | |
6292 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6293 | { | |
6294 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
1eb8556f SM |
6295 | infrun_debug_printf ("delayed hardware breakpoint/watchpoint " |
6296 | "trap, ignoring"); | |
1cf4d951 PA |
6297 | random_signal = 0; |
6298 | } | |
6299 | ||
bac7d97b PA |
6300 | /* If not, perhaps stepping/nexting can. */ |
6301 | if (random_signal) | |
1edb66d8 | 6302 | random_signal = !(ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP |
bac7d97b | 6303 | && currently_stepping (ecs->event_thread)); |
ab04a2af | 6304 | |
2adfaa28 PA |
6305 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6306 | thread. Single-step breakpoints are transparent to the | |
6307 | breakpoints module. */ | |
6308 | if (random_signal) | |
6309 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6310 | ||
bac7d97b PA |
6311 | /* No? Perhaps we got a moribund watchpoint. */ |
6312 | if (random_signal) | |
6313 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6314 | |
c65d6b55 PA |
6315 | /* Always stop if the user explicitly requested this thread to |
6316 | remain stopped. */ | |
6317 | if (ecs->event_thread->stop_requested) | |
6318 | { | |
6319 | random_signal = 1; | |
1eb8556f | 6320 | infrun_debug_printf ("user-requested stop"); |
c65d6b55 PA |
6321 | } |
6322 | ||
488f131b JB |
6323 | /* For the program's own signals, act according to |
6324 | the signal handling tables. */ | |
6325 | ||
ce12b012 | 6326 | if (random_signal) |
488f131b JB |
6327 | { |
6328 | /* Signal not for debugging purposes. */ | |
1edb66d8 | 6329 | enum gdb_signal stop_signal = ecs->event_thread->stop_signal (); |
488f131b | 6330 | |
1eb8556f SM |
6331 | infrun_debug_printf ("random signal (%s)", |
6332 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6333 | |
488f131b JB |
6334 | stopped_by_random_signal = 1; |
6335 | ||
252fbfc8 PA |
6336 | /* Always stop on signals if we're either just gaining control |
6337 | of the program, or the user explicitly requested this thread | |
6338 | to remain stopped. */ | |
d6b48e9c | 6339 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6340 | || ecs->event_thread->stop_requested |
1edb66d8 | 6341 | || signal_stop_state (ecs->event_thread->stop_signal ())) |
488f131b | 6342 | { |
22bcd14b | 6343 | stop_waiting (ecs); |
488f131b JB |
6344 | return; |
6345 | } | |
b57bacec PA |
6346 | |
6347 | /* Notify observers the signal has "handle print" set. Note we | |
6348 | returned early above if stopping; normal_stop handles the | |
6349 | printing in that case. */ | |
1edb66d8 | 6350 | if (signal_print[ecs->event_thread->stop_signal ()]) |
b57bacec PA |
6351 | { |
6352 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6353 | target_terminal::ours_for_output (); |
1edb66d8 | 6354 | gdb::observers::signal_received.notify (ecs->event_thread->stop_signal ()); |
223ffa71 | 6355 | target_terminal::inferior (); |
b57bacec | 6356 | } |
488f131b JB |
6357 | |
6358 | /* Clear the signal if it should not be passed. */ | |
1edb66d8 SM |
6359 | if (signal_program[ecs->event_thread->stop_signal ()] == 0) |
6360 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
488f131b | 6361 | |
1edb66d8 | 6362 | if (ecs->event_thread->prev_pc == ecs->event_thread->stop_pc () |
16c381f0 | 6363 | && ecs->event_thread->control.trap_expected |
8358c15c | 6364 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6365 | { |
6366 | /* We were just starting a new sequence, attempting to | |
6367 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6368 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6369 | of the stepping range so GDB needs to remember to, when |
6370 | the signal handler returns, resume stepping off that | |
6371 | breakpoint. */ | |
6372 | /* To simplify things, "continue" is forced to use the same | |
6373 | code paths as single-step - set a breakpoint at the | |
6374 | signal return address and then, once hit, step off that | |
6375 | breakpoint. */ | |
1eb8556f | 6376 | infrun_debug_printf ("signal arrived while stepping over breakpoint"); |
d3169d93 | 6377 | |
2c03e5be | 6378 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6379 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6380 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6381 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6382 | |
6383 | /* If we were nexting/stepping some other thread, switch to | |
6384 | it, so that we don't continue it, losing control. */ | |
6385 | if (!switch_back_to_stepped_thread (ecs)) | |
6386 | keep_going (ecs); | |
9d799f85 | 6387 | return; |
68f53502 | 6388 | } |
9d799f85 | 6389 | |
1edb66d8 SM |
6390 | if (ecs->event_thread->stop_signal () != GDB_SIGNAL_0 |
6391 | && (pc_in_thread_step_range (ecs->event_thread->stop_pc (), | |
f2ffa92b | 6392 | ecs->event_thread) |
e5f8a7cc | 6393 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 6394 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6395 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6396 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6397 | { |
6398 | /* The inferior is about to take a signal that will take it | |
6399 | out of the single step range. Set a breakpoint at the | |
6400 | current PC (which is presumably where the signal handler | |
6401 | will eventually return) and then allow the inferior to | |
6402 | run free. | |
6403 | ||
6404 | Note that this is only needed for a signal delivered | |
6405 | while in the single-step range. Nested signals aren't a | |
6406 | problem as they eventually all return. */ | |
1eb8556f | 6407 | infrun_debug_printf ("signal may take us out of single-step range"); |
237fc4c9 | 6408 | |
372316f1 | 6409 | clear_step_over_info (); |
2c03e5be | 6410 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6411 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6412 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6413 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6414 | keep_going (ecs); |
6415 | return; | |
d303a6c7 | 6416 | } |
9d799f85 | 6417 | |
85102364 | 6418 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6419 | when either there's a nested signal, or when there's a |
6420 | pending signal enabled just as the signal handler returns | |
6421 | (leaving the inferior at the step-resume-breakpoint without | |
6422 | actually executing it). Either way continue until the | |
6423 | breakpoint is really hit. */ | |
c447ac0b PA |
6424 | |
6425 | if (!switch_back_to_stepped_thread (ecs)) | |
6426 | { | |
1eb8556f | 6427 | infrun_debug_printf ("random signal, keep going"); |
c447ac0b PA |
6428 | |
6429 | keep_going (ecs); | |
6430 | } | |
6431 | return; | |
488f131b | 6432 | } |
94c57d6a PA |
6433 | |
6434 | process_event_stop_test (ecs); | |
6435 | } | |
6436 | ||
6437 | /* Come here when we've got some debug event / signal we can explain | |
6438 | (IOW, not a random signal), and test whether it should cause a | |
6439 | stop, or whether we should resume the inferior (transparently). | |
6440 | E.g., could be a breakpoint whose condition evaluates false; we | |
6441 | could be still stepping within the line; etc. */ | |
6442 | ||
6443 | static void | |
6444 | process_event_stop_test (struct execution_control_state *ecs) | |
6445 | { | |
6446 | struct symtab_and_line stop_pc_sal; | |
6447 | struct frame_info *frame; | |
6448 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6449 | CORE_ADDR jmp_buf_pc; |
6450 | struct bpstat_what what; | |
94c57d6a | 6451 | |
cdaa5b73 | 6452 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6453 | |
cdaa5b73 PA |
6454 | frame = get_current_frame (); |
6455 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6456 | |
cdaa5b73 | 6457 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6458 | |
cdaa5b73 PA |
6459 | if (what.call_dummy) |
6460 | { | |
6461 | stop_stack_dummy = what.call_dummy; | |
6462 | } | |
186c406b | 6463 | |
243a9253 PA |
6464 | /* A few breakpoint types have callbacks associated (e.g., |
6465 | bp_jit_event). Run them now. */ | |
6466 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6467 | ||
cdaa5b73 PA |
6468 | /* If we hit an internal event that triggers symbol changes, the |
6469 | current frame will be invalidated within bpstat_what (e.g., if we | |
6470 | hit an internal solib event). Re-fetch it. */ | |
6471 | frame = get_current_frame (); | |
6472 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6473 | |
cdaa5b73 PA |
6474 | switch (what.main_action) |
6475 | { | |
6476 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6477 | /* If we hit the breakpoint at longjmp while stepping, we | |
6478 | install a momentary breakpoint at the target of the | |
6479 | jmp_buf. */ | |
186c406b | 6480 | |
1eb8556f | 6481 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME"); |
186c406b | 6482 | |
cdaa5b73 | 6483 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6484 | |
cdaa5b73 PA |
6485 | if (what.is_longjmp) |
6486 | { | |
6487 | struct value *arg_value; | |
6488 | ||
6489 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6490 | then use it to extract the arguments. The destination PC | |
6491 | is the third argument to the probe. */ | |
6492 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6493 | if (arg_value) | |
8fa0c4f8 AA |
6494 | { |
6495 | jmp_buf_pc = value_as_address (arg_value); | |
6496 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6497 | } | |
cdaa5b73 PA |
6498 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6499 | || !gdbarch_get_longjmp_target (gdbarch, | |
6500 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6501 | { |
1eb8556f SM |
6502 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME " |
6503 | "(!gdbarch_get_longjmp_target)"); | |
cdaa5b73 PA |
6504 | keep_going (ecs); |
6505 | return; | |
e2e4d78b | 6506 | } |
e2e4d78b | 6507 | |
cdaa5b73 PA |
6508 | /* Insert a breakpoint at resume address. */ |
6509 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6510 | } | |
6511 | else | |
6512 | check_exception_resume (ecs, frame); | |
6513 | keep_going (ecs); | |
6514 | return; | |
e81a37f7 | 6515 | |
cdaa5b73 PA |
6516 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6517 | { | |
6518 | struct frame_info *init_frame; | |
e81a37f7 | 6519 | |
cdaa5b73 | 6520 | /* There are several cases to consider. |
c906108c | 6521 | |
cdaa5b73 PA |
6522 | 1. The initiating frame no longer exists. In this case we |
6523 | must stop, because the exception or longjmp has gone too | |
6524 | far. | |
2c03e5be | 6525 | |
cdaa5b73 PA |
6526 | 2. The initiating frame exists, and is the same as the |
6527 | current frame. We stop, because the exception or longjmp | |
6528 | has been caught. | |
2c03e5be | 6529 | |
cdaa5b73 PA |
6530 | 3. The initiating frame exists and is different from the |
6531 | current frame. This means the exception or longjmp has | |
6532 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6533 | |
cdaa5b73 PA |
6534 | 4. longjmp breakpoint has been placed just to protect |
6535 | against stale dummy frames and user is not interested in | |
6536 | stopping around longjmps. */ | |
c5aa993b | 6537 | |
1eb8556f | 6538 | infrun_debug_printf ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME"); |
c5aa993b | 6539 | |
cdaa5b73 PA |
6540 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6541 | != NULL); | |
6542 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6543 | |
cdaa5b73 PA |
6544 | if (what.is_longjmp) |
6545 | { | |
b67a2c6f | 6546 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6547 | |
cdaa5b73 | 6548 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6549 | { |
cdaa5b73 PA |
6550 | /* Case 4. */ |
6551 | keep_going (ecs); | |
6552 | return; | |
e5ef252a | 6553 | } |
cdaa5b73 | 6554 | } |
c5aa993b | 6555 | |
cdaa5b73 | 6556 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6557 | |
cdaa5b73 PA |
6558 | if (init_frame) |
6559 | { | |
6560 | struct frame_id current_id | |
6561 | = get_frame_id (get_current_frame ()); | |
6562 | if (frame_id_eq (current_id, | |
6563 | ecs->event_thread->initiating_frame)) | |
6564 | { | |
6565 | /* Case 2. Fall through. */ | |
6566 | } | |
6567 | else | |
6568 | { | |
6569 | /* Case 3. */ | |
6570 | keep_going (ecs); | |
6571 | return; | |
6572 | } | |
68f53502 | 6573 | } |
488f131b | 6574 | |
cdaa5b73 PA |
6575 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6576 | exists. */ | |
6577 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6578 | |
bdc36728 | 6579 | end_stepping_range (ecs); |
cdaa5b73 PA |
6580 | } |
6581 | return; | |
e5ef252a | 6582 | |
cdaa5b73 | 6583 | case BPSTAT_WHAT_SINGLE: |
1eb8556f | 6584 | infrun_debug_printf ("BPSTAT_WHAT_SINGLE"); |
cdaa5b73 PA |
6585 | ecs->event_thread->stepping_over_breakpoint = 1; |
6586 | /* Still need to check other stuff, at least the case where we | |
6587 | are stepping and step out of the right range. */ | |
6588 | break; | |
e5ef252a | 6589 | |
cdaa5b73 | 6590 | case BPSTAT_WHAT_STEP_RESUME: |
1eb8556f | 6591 | infrun_debug_printf ("BPSTAT_WHAT_STEP_RESUME"); |
e5ef252a | 6592 | |
cdaa5b73 PA |
6593 | delete_step_resume_breakpoint (ecs->event_thread); |
6594 | if (ecs->event_thread->control.proceed_to_finish | |
6595 | && execution_direction == EXEC_REVERSE) | |
6596 | { | |
6597 | struct thread_info *tp = ecs->event_thread; | |
6598 | ||
6599 | /* We are finishing a function in reverse, and just hit the | |
6600 | step-resume breakpoint at the start address of the | |
6601 | function, and we're almost there -- just need to back up | |
6602 | by one more single-step, which should take us back to the | |
6603 | function call. */ | |
6604 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6605 | keep_going (ecs); | |
e5ef252a | 6606 | return; |
cdaa5b73 PA |
6607 | } |
6608 | fill_in_stop_func (gdbarch, ecs); | |
1edb66d8 | 6609 | if (ecs->event_thread->stop_pc () == ecs->stop_func_start |
cdaa5b73 PA |
6610 | && execution_direction == EXEC_REVERSE) |
6611 | { | |
6612 | /* We are stepping over a function call in reverse, and just | |
6613 | hit the step-resume breakpoint at the start address of | |
6614 | the function. Go back to single-stepping, which should | |
6615 | take us back to the function call. */ | |
6616 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6617 | keep_going (ecs); | |
6618 | return; | |
6619 | } | |
6620 | break; | |
e5ef252a | 6621 | |
cdaa5b73 | 6622 | case BPSTAT_WHAT_STOP_NOISY: |
1eb8556f | 6623 | infrun_debug_printf ("BPSTAT_WHAT_STOP_NOISY"); |
c4464ade | 6624 | stop_print_frame = true; |
e5ef252a | 6625 | |
33bf4c5c | 6626 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6627 | whether a/the breakpoint is there when the thread is next |
6628 | resumed. */ | |
6629 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6630 | |
22bcd14b | 6631 | stop_waiting (ecs); |
cdaa5b73 | 6632 | return; |
e5ef252a | 6633 | |
cdaa5b73 | 6634 | case BPSTAT_WHAT_STOP_SILENT: |
1eb8556f | 6635 | infrun_debug_printf ("BPSTAT_WHAT_STOP_SILENT"); |
c4464ade | 6636 | stop_print_frame = false; |
e5ef252a | 6637 | |
33bf4c5c | 6638 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6639 | whether a/the breakpoint is there when the thread is next |
6640 | resumed. */ | |
6641 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6642 | stop_waiting (ecs); |
cdaa5b73 PA |
6643 | return; |
6644 | ||
6645 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
1eb8556f | 6646 | infrun_debug_printf ("BPSTAT_WHAT_HP_STEP_RESUME"); |
cdaa5b73 PA |
6647 | |
6648 | delete_step_resume_breakpoint (ecs->event_thread); | |
6649 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6650 | { | |
6651 | /* Back when the step-resume breakpoint was inserted, we | |
6652 | were trying to single-step off a breakpoint. Go back to | |
6653 | doing that. */ | |
6654 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6655 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6656 | keep_going (ecs); | |
6657 | return; | |
e5ef252a | 6658 | } |
cdaa5b73 PA |
6659 | break; |
6660 | ||
6661 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6662 | break; | |
e5ef252a | 6663 | } |
c906108c | 6664 | |
af48d08f PA |
6665 | /* If we stepped a permanent breakpoint and we had a high priority |
6666 | step-resume breakpoint for the address we stepped, but we didn't | |
6667 | hit it, then we must have stepped into the signal handler. The | |
6668 | step-resume was only necessary to catch the case of _not_ | |
6669 | stepping into the handler, so delete it, and fall through to | |
6670 | checking whether the step finished. */ | |
6671 | if (ecs->event_thread->stepped_breakpoint) | |
6672 | { | |
6673 | struct breakpoint *sr_bp | |
6674 | = ecs->event_thread->control.step_resume_breakpoint; | |
6675 | ||
8d707a12 PA |
6676 | if (sr_bp != NULL |
6677 | && sr_bp->loc->permanent | |
af48d08f PA |
6678 | && sr_bp->type == bp_hp_step_resume |
6679 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6680 | { | |
1eb8556f | 6681 | infrun_debug_printf ("stepped permanent breakpoint, stopped in handler"); |
af48d08f PA |
6682 | delete_step_resume_breakpoint (ecs->event_thread); |
6683 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6684 | } | |
6685 | } | |
6686 | ||
cdaa5b73 PA |
6687 | /* We come here if we hit a breakpoint but should not stop for it. |
6688 | Possibly we also were stepping and should stop for that. So fall | |
6689 | through and test for stepping. But, if not stepping, do not | |
6690 | stop. */ | |
c906108c | 6691 | |
a7212384 UW |
6692 | /* In all-stop mode, if we're currently stepping but have stopped in |
6693 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6694 | if (switch_back_to_stepped_thread (ecs)) |
6695 | return; | |
776f04fa | 6696 | |
8358c15c | 6697 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6698 | { |
1eb8556f | 6699 | infrun_debug_printf ("step-resume breakpoint is inserted"); |
527159b7 | 6700 | |
488f131b | 6701 | /* Having a step-resume breakpoint overrides anything |
dda83cd7 SM |
6702 | else having to do with stepping commands until |
6703 | that breakpoint is reached. */ | |
488f131b JB |
6704 | keep_going (ecs); |
6705 | return; | |
6706 | } | |
c5aa993b | 6707 | |
16c381f0 | 6708 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6709 | { |
1eb8556f | 6710 | infrun_debug_printf ("no stepping, continue"); |
488f131b | 6711 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6712 | keep_going (ecs); |
6713 | return; | |
6714 | } | |
c5aa993b | 6715 | |
4b7703ad JB |
6716 | /* Re-fetch current thread's frame in case the code above caused |
6717 | the frame cache to be re-initialized, making our FRAME variable | |
6718 | a dangling pointer. */ | |
6719 | frame = get_current_frame (); | |
628fe4e4 | 6720 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6721 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6722 | |
488f131b | 6723 | /* If stepping through a line, keep going if still within it. |
c906108c | 6724 | |
488f131b JB |
6725 | Note that step_range_end is the address of the first instruction |
6726 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6727 | within it! |
6728 | ||
6729 | Note also that during reverse execution, we may be stepping | |
6730 | through a function epilogue and therefore must detect when | |
6731 | the current-frame changes in the middle of a line. */ | |
6732 | ||
1edb66d8 | 6733 | if (pc_in_thread_step_range (ecs->event_thread->stop_pc (), |
f2ffa92b | 6734 | ecs->event_thread) |
31410e84 | 6735 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6736 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6737 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6738 | { |
1eb8556f SM |
6739 | infrun_debug_printf |
6740 | ("stepping inside range [%s-%s]", | |
6741 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
6742 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6743 | |
c1e36e3e PA |
6744 | /* Tentatively re-enable range stepping; `resume' disables it if |
6745 | necessary (e.g., if we're stepping over a breakpoint or we | |
6746 | have software watchpoints). */ | |
6747 | ecs->event_thread->control.may_range_step = 1; | |
6748 | ||
b2175913 MS |
6749 | /* When stepping backward, stop at beginning of line range |
6750 | (unless it's the function entry point, in which case | |
6751 | keep going back to the call point). */ | |
1edb66d8 | 6752 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
16c381f0 | 6753 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6754 | && stop_pc != ecs->stop_func_start |
6755 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6756 | end_stepping_range (ecs); |
b2175913 MS |
6757 | else |
6758 | keep_going (ecs); | |
6759 | ||
488f131b JB |
6760 | return; |
6761 | } | |
c5aa993b | 6762 | |
488f131b | 6763 | /* We stepped out of the stepping range. */ |
c906108c | 6764 | |
488f131b | 6765 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6766 | loader dynamic symbol resolution code... |
6767 | ||
6768 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6769 | time loader code and reach the callee's address. | |
6770 | ||
6771 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6772 | the runtime loader code is handled just like any other | |
6773 | undebuggable function call. Now we need only keep stepping | |
6774 | backward through the trampoline code, and that's handled further | |
6775 | down, so there is nothing for us to do here. */ | |
6776 | ||
6777 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6778 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
1edb66d8 | 6779 | && in_solib_dynsym_resolve_code (ecs->event_thread->stop_pc ())) |
488f131b | 6780 | { |
4c8c40e6 | 6781 | CORE_ADDR pc_after_resolver = |
1edb66d8 | 6782 | gdbarch_skip_solib_resolver (gdbarch, ecs->event_thread->stop_pc ()); |
c906108c | 6783 | |
1eb8556f | 6784 | infrun_debug_printf ("stepped into dynsym resolve code"); |
527159b7 | 6785 | |
488f131b JB |
6786 | if (pc_after_resolver) |
6787 | { | |
6788 | /* Set up a step-resume breakpoint at the address | |
6789 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6790 | symtab_and_line sr_sal; |
488f131b | 6791 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6792 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6793 | |
a6d9a66e UW |
6794 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6795 | sr_sal, null_frame_id); | |
c5aa993b | 6796 | } |
c906108c | 6797 | |
488f131b JB |
6798 | keep_going (ecs); |
6799 | return; | |
6800 | } | |
c906108c | 6801 | |
1d509aa6 MM |
6802 | /* Step through an indirect branch thunk. */ |
6803 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b | 6804 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
1edb66d8 | 6805 | ecs->event_thread->stop_pc ())) |
1d509aa6 | 6806 | { |
1eb8556f | 6807 | infrun_debug_printf ("stepped into indirect branch thunk"); |
1d509aa6 MM |
6808 | keep_going (ecs); |
6809 | return; | |
6810 | } | |
6811 | ||
16c381f0 JK |
6812 | if (ecs->event_thread->control.step_range_end != 1 |
6813 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6814 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6815 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6816 | { |
1eb8556f | 6817 | infrun_debug_printf ("stepped into signal trampoline"); |
42edda50 | 6818 | /* The inferior, while doing a "step" or "next", has ended up in |
dda83cd7 SM |
6819 | a signal trampoline (either by a signal being delivered or by |
6820 | the signal handler returning). Just single-step until the | |
6821 | inferior leaves the trampoline (either by calling the handler | |
6822 | or returning). */ | |
488f131b JB |
6823 | keep_going (ecs); |
6824 | return; | |
6825 | } | |
c906108c | 6826 | |
14132e89 MR |
6827 | /* If we're in the return path from a shared library trampoline, |
6828 | we want to proceed through the trampoline when stepping. */ | |
6829 | /* macro/2012-04-25: This needs to come before the subroutine | |
6830 | call check below as on some targets return trampolines look | |
6831 | like subroutine calls (MIPS16 return thunks). */ | |
6832 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
1edb66d8 | 6833 | ecs->event_thread->stop_pc (), |
f2ffa92b | 6834 | ecs->stop_func_name) |
14132e89 MR |
6835 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6836 | { | |
6837 | /* Determine where this trampoline returns. */ | |
1edb66d8 | 6838 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
f2ffa92b PA |
6839 | CORE_ADDR real_stop_pc |
6840 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 | 6841 | |
1eb8556f | 6842 | infrun_debug_printf ("stepped into solib return tramp"); |
14132e89 MR |
6843 | |
6844 | /* Only proceed through if we know where it's going. */ | |
6845 | if (real_stop_pc) | |
6846 | { | |
6847 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6848 | symtab_and_line sr_sal; |
14132e89 MR |
6849 | sr_sal.pc = real_stop_pc; |
6850 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6851 | sr_sal.pspace = get_frame_program_space (frame); | |
6852 | ||
6853 | /* Do not specify what the fp should be when we stop since | |
6854 | on some machines the prologue is where the new fp value | |
6855 | is established. */ | |
6856 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6857 | sr_sal, null_frame_id); | |
6858 | ||
6859 | /* Restart without fiddling with the step ranges or | |
6860 | other state. */ | |
6861 | keep_going (ecs); | |
6862 | return; | |
6863 | } | |
6864 | } | |
6865 | ||
c17eaafe DJ |
6866 | /* Check for subroutine calls. The check for the current frame |
6867 | equalling the step ID is not necessary - the check of the | |
6868 | previous frame's ID is sufficient - but it is a common case and | |
6869 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6870 | |
6871 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6872 | being equal, so to get into this block, both the current and | |
6873 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6874 | /* The outer_frame_id check is a heuristic to detect stepping |
6875 | through startup code. If we step over an instruction which | |
6876 | sets the stack pointer from an invalid value to a valid value, | |
6877 | we may detect that as a subroutine call from the mythical | |
6878 | "outermost" function. This could be fixed by marking | |
6879 | outermost frames as !stack_p,code_p,special_p. Then the | |
6880 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6881 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6882 | for more. */ |
edb3359d | 6883 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6884 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6885 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6886 | ecs->event_thread->control.step_stack_frame_id) |
6887 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6888 | outer_frame_id) |
885eeb5b | 6889 | || (ecs->event_thread->control.step_start_function |
1edb66d8 | 6890 | != find_pc_function (ecs->event_thread->stop_pc ()))))) |
488f131b | 6891 | { |
1edb66d8 | 6892 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
95918acb | 6893 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6894 | |
1eb8556f | 6895 | infrun_debug_printf ("stepped into subroutine"); |
527159b7 | 6896 | |
b7a084be | 6897 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6898 | { |
6899 | /* I presume that step_over_calls is only 0 when we're | |
6900 | supposed to be stepping at the assembly language level | |
6901 | ("stepi"). Just stop. */ | |
388a8562 | 6902 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6903 | end_stepping_range (ecs); |
95918acb AC |
6904 | return; |
6905 | } | |
8fb3e588 | 6906 | |
388a8562 MS |
6907 | /* Reverse stepping through solib trampolines. */ |
6908 | ||
6909 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6910 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6911 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6912 | || (ecs->stop_func_start == 0 | |
6913 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6914 | { | |
6915 | /* Any solib trampoline code can be handled in reverse | |
6916 | by simply continuing to single-step. We have already | |
6917 | executed the solib function (backwards), and a few | |
6918 | steps will take us back through the trampoline to the | |
6919 | caller. */ | |
6920 | keep_going (ecs); | |
6921 | return; | |
6922 | } | |
6923 | ||
16c381f0 | 6924 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6925 | { |
b2175913 MS |
6926 | /* We're doing a "next". |
6927 | ||
6928 | Normal (forward) execution: set a breakpoint at the | |
6929 | callee's return address (the address at which the caller | |
6930 | will resume). | |
6931 | ||
6932 | Reverse (backward) execution. set the step-resume | |
6933 | breakpoint at the start of the function that we just | |
6934 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6935 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6936 | |
6937 | if (execution_direction == EXEC_REVERSE) | |
6938 | { | |
acf9414f JK |
6939 | /* If we're already at the start of the function, we've either |
6940 | just stepped backward into a single instruction function, | |
6941 | or stepped back out of a signal handler to the first instruction | |
6942 | of the function. Just keep going, which will single-step back | |
6943 | to the caller. */ | |
58c48e72 | 6944 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6945 | { |
acf9414f | 6946 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6947 | symtab_and_line sr_sal; |
acf9414f JK |
6948 | sr_sal.pc = ecs->stop_func_start; |
6949 | sr_sal.pspace = get_frame_program_space (frame); | |
6950 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6951 | sr_sal, null_frame_id); | |
6952 | } | |
b2175913 MS |
6953 | } |
6954 | else | |
568d6575 | 6955 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6956 | |
8567c30f AC |
6957 | keep_going (ecs); |
6958 | return; | |
6959 | } | |
a53c66de | 6960 | |
95918acb | 6961 | /* If we are in a function call trampoline (a stub between the |
dda83cd7 SM |
6962 | calling routine and the real function), locate the real |
6963 | function. That's what tells us (a) whether we want to step | |
6964 | into it at all, and (b) what prologue we want to run to the | |
6965 | end of, if we do step into it. */ | |
568d6575 | 6966 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6967 | if (real_stop_pc == 0) |
568d6575 | 6968 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6969 | if (real_stop_pc != 0) |
6970 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6971 | |
db5f024e | 6972 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6973 | { |
51abb421 | 6974 | symtab_and_line sr_sal; |
1b2bfbb9 | 6975 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6976 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6977 | |
a6d9a66e UW |
6978 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6979 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6980 | keep_going (ecs); |
6981 | return; | |
1b2bfbb9 RC |
6982 | } |
6983 | ||
95918acb | 6984 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6985 | thinking of stepping into and the function isn't on the skip |
6986 | list, step into it. | |
95918acb | 6987 | |
dda83cd7 SM |
6988 | If there are several symtabs at that PC (e.g. with include |
6989 | files), just want to know whether *any* of them have line | |
6990 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6991 | { |
6992 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6993 | |
95918acb | 6994 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6995 | if (tmp_sal.line != 0 |
85817405 | 6996 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
6997 | tmp_sal) |
6998 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 6999 | { |
b2175913 | 7000 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 7001 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 7002 | else |
568d6575 | 7003 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
7004 | return; |
7005 | } | |
7006 | } | |
7007 | ||
7008 | /* If we have no line number and the step-stop-if-no-debug is | |
dda83cd7 SM |
7009 | set, we stop the step so that the user has a chance to switch |
7010 | in assembly mode. */ | |
16c381f0 | 7011 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 7012 | && step_stop_if_no_debug) |
95918acb | 7013 | { |
bdc36728 | 7014 | end_stepping_range (ecs); |
95918acb AC |
7015 | return; |
7016 | } | |
7017 | ||
b2175913 MS |
7018 | if (execution_direction == EXEC_REVERSE) |
7019 | { | |
acf9414f JK |
7020 | /* If we're already at the start of the function, we've either just |
7021 | stepped backward into a single instruction function without line | |
7022 | number info, or stepped back out of a signal handler to the first | |
7023 | instruction of the function without line number info. Just keep | |
7024 | going, which will single-step back to the caller. */ | |
7025 | if (ecs->stop_func_start != stop_pc) | |
7026 | { | |
7027 | /* Set a breakpoint at callee's start address. | |
7028 | From there we can step once and be back in the caller. */ | |
51abb421 | 7029 | symtab_and_line sr_sal; |
acf9414f JK |
7030 | sr_sal.pc = ecs->stop_func_start; |
7031 | sr_sal.pspace = get_frame_program_space (frame); | |
7032 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7033 | sr_sal, null_frame_id); | |
7034 | } | |
b2175913 MS |
7035 | } |
7036 | else | |
7037 | /* Set a breakpoint at callee's return address (the address | |
7038 | at which the caller will resume). */ | |
568d6575 | 7039 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7040 | |
95918acb | 7041 | keep_going (ecs); |
488f131b | 7042 | return; |
488f131b | 7043 | } |
c906108c | 7044 | |
fdd654f3 MS |
7045 | /* Reverse stepping through solib trampolines. */ |
7046 | ||
7047 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 7048 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 7049 | { |
1edb66d8 | 7050 | CORE_ADDR stop_pc = ecs->event_thread->stop_pc (); |
f2ffa92b | 7051 | |
fdd654f3 MS |
7052 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
7053 | || (ecs->stop_func_start == 0 | |
7054 | && in_solib_dynsym_resolve_code (stop_pc))) | |
7055 | { | |
7056 | /* Any solib trampoline code can be handled in reverse | |
7057 | by simply continuing to single-step. We have already | |
7058 | executed the solib function (backwards), and a few | |
7059 | steps will take us back through the trampoline to the | |
7060 | caller. */ | |
7061 | keep_going (ecs); | |
7062 | return; | |
7063 | } | |
7064 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
7065 | { | |
7066 | /* Stepped backward into the solib dynsym resolver. | |
7067 | Set a breakpoint at its start and continue, then | |
7068 | one more step will take us out. */ | |
51abb421 | 7069 | symtab_and_line sr_sal; |
fdd654f3 | 7070 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 7071 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
7072 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7073 | sr_sal, null_frame_id); | |
7074 | keep_going (ecs); | |
7075 | return; | |
7076 | } | |
7077 | } | |
7078 | ||
8c95582d AB |
7079 | /* This always returns the sal for the inner-most frame when we are in a |
7080 | stack of inlined frames, even if GDB actually believes that it is in a | |
7081 | more outer frame. This is checked for below by calls to | |
7082 | inline_skipped_frames. */ | |
1edb66d8 | 7083 | stop_pc_sal = find_pc_line (ecs->event_thread->stop_pc (), 0); |
7ed0fe66 | 7084 | |
1b2bfbb9 RC |
7085 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
7086 | the trampoline processing logic, however, there are some trampolines | |
7087 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 7088 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 7089 | && ecs->stop_func_name == NULL |
2afb61aa | 7090 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 7091 | { |
1eb8556f | 7092 | infrun_debug_printf ("stepped into undebuggable function"); |
527159b7 | 7093 | |
1b2bfbb9 | 7094 | /* The inferior just stepped into, or returned to, an |
dda83cd7 SM |
7095 | undebuggable function (where there is no debugging information |
7096 | and no line number corresponding to the address where the | |
7097 | inferior stopped). Since we want to skip this kind of code, | |
7098 | we keep going until the inferior returns from this | |
7099 | function - unless the user has asked us not to (via | |
7100 | set step-mode) or we no longer know how to get back | |
7101 | to the call site. */ | |
14e60db5 | 7102 | if (step_stop_if_no_debug |
c7ce8faa | 7103 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
7104 | { |
7105 | /* If we have no line number and the step-stop-if-no-debug | |
7106 | is set, we stop the step so that the user has a chance to | |
7107 | switch in assembly mode. */ | |
bdc36728 | 7108 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7109 | return; |
7110 | } | |
7111 | else | |
7112 | { | |
7113 | /* Set a breakpoint at callee's return address (the address | |
7114 | at which the caller will resume). */ | |
568d6575 | 7115 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
7116 | keep_going (ecs); |
7117 | return; | |
7118 | } | |
7119 | } | |
7120 | ||
16c381f0 | 7121 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
7122 | { |
7123 | /* It is stepi or nexti. We always want to stop stepping after | |
dda83cd7 | 7124 | one instruction. */ |
1eb8556f | 7125 | infrun_debug_printf ("stepi/nexti"); |
bdc36728 | 7126 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7127 | return; |
7128 | } | |
7129 | ||
2afb61aa | 7130 | if (stop_pc_sal.line == 0) |
488f131b JB |
7131 | { |
7132 | /* We have no line number information. That means to stop | |
dda83cd7 SM |
7133 | stepping (does this always happen right after one instruction, |
7134 | when we do "s" in a function with no line numbers, | |
7135 | or can this happen as a result of a return or longjmp?). */ | |
1eb8556f | 7136 | infrun_debug_printf ("line number info"); |
bdc36728 | 7137 | end_stepping_range (ecs); |
488f131b JB |
7138 | return; |
7139 | } | |
c906108c | 7140 | |
edb3359d DJ |
7141 | /* Look for "calls" to inlined functions, part one. If the inline |
7142 | frame machinery detected some skipped call sites, we have entered | |
7143 | a new inline function. */ | |
7144 | ||
7145 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7146 | ecs->event_thread->control.step_frame_id) |
00431a78 | 7147 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 7148 | { |
1eb8556f | 7149 | infrun_debug_printf ("stepped into inlined function"); |
edb3359d | 7150 | |
51abb421 | 7151 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 7152 | |
16c381f0 | 7153 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
7154 | { |
7155 | /* For "step", we're going to stop. But if the call site | |
7156 | for this inlined function is on the same source line as | |
7157 | we were previously stepping, go down into the function | |
7158 | first. Otherwise stop at the call site. */ | |
7159 | ||
7160 | if (call_sal.line == ecs->event_thread->current_line | |
7161 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7162 | { |
7163 | step_into_inline_frame (ecs->event_thread); | |
7164 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7165 | { | |
7166 | keep_going (ecs); | |
7167 | return; | |
7168 | } | |
7169 | } | |
edb3359d | 7170 | |
bdc36728 | 7171 | end_stepping_range (ecs); |
edb3359d DJ |
7172 | return; |
7173 | } | |
7174 | else | |
7175 | { | |
7176 | /* For "next", we should stop at the call site if it is on a | |
7177 | different source line. Otherwise continue through the | |
7178 | inlined function. */ | |
7179 | if (call_sal.line == ecs->event_thread->current_line | |
7180 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7181 | keep_going (ecs); | |
7182 | else | |
bdc36728 | 7183 | end_stepping_range (ecs); |
edb3359d DJ |
7184 | return; |
7185 | } | |
7186 | } | |
7187 | ||
7188 | /* Look for "calls" to inlined functions, part two. If we are still | |
7189 | in the same real function we were stepping through, but we have | |
7190 | to go further up to find the exact frame ID, we are stepping | |
7191 | through a more inlined call beyond its call site. */ | |
7192 | ||
7193 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
7194 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7195 | ecs->event_thread->control.step_frame_id) |
edb3359d | 7196 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7197 | ecs->event_thread->control.step_frame_id)) |
edb3359d | 7198 | { |
1eb8556f | 7199 | infrun_debug_printf ("stepping through inlined function"); |
edb3359d | 7200 | |
4a4c04f1 BE |
7201 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7202 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7203 | keep_going (ecs); |
7204 | else | |
bdc36728 | 7205 | end_stepping_range (ecs); |
edb3359d DJ |
7206 | return; |
7207 | } | |
7208 | ||
8c95582d | 7209 | bool refresh_step_info = true; |
1edb66d8 | 7210 | if ((ecs->event_thread->stop_pc () == stop_pc_sal.pc) |
4e1c45ea | 7211 | && (ecs->event_thread->current_line != stop_pc_sal.line |
24b21115 | 7212 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) |
488f131b | 7213 | { |
ebde6f2d TV |
7214 | /* We are at a different line. */ |
7215 | ||
8c95582d AB |
7216 | if (stop_pc_sal.is_stmt) |
7217 | { | |
ebde6f2d TV |
7218 | /* We are at the start of a statement. |
7219 | ||
7220 | So stop. Note that we don't stop if we step into the middle of a | |
7221 | statement. That is said to make things like for (;;) statements | |
7222 | work better. */ | |
1eb8556f | 7223 | infrun_debug_printf ("stepped to a different line"); |
8c95582d AB |
7224 | end_stepping_range (ecs); |
7225 | return; | |
7226 | } | |
7227 | else if (frame_id_eq (get_frame_id (get_current_frame ()), | |
ebde6f2d | 7228 | ecs->event_thread->control.step_frame_id)) |
8c95582d | 7229 | { |
ebde6f2d TV |
7230 | /* We are not at the start of a statement, and we have not changed |
7231 | frame. | |
7232 | ||
7233 | We ignore this line table entry, and continue stepping forward, | |
8c95582d AB |
7234 | looking for a better place to stop. */ |
7235 | refresh_step_info = false; | |
1eb8556f SM |
7236 | infrun_debug_printf ("stepped to a different line, but " |
7237 | "it's not the start of a statement"); | |
8c95582d | 7238 | } |
ebde6f2d TV |
7239 | else |
7240 | { | |
7241 | /* We are not the start of a statement, and we have changed frame. | |
7242 | ||
7243 | We ignore this line table entry, and continue stepping forward, | |
7244 | looking for a better place to stop. Keep refresh_step_info at | |
7245 | true to note that the frame has changed, but ignore the line | |
7246 | number to make sure we don't ignore a subsequent entry with the | |
7247 | same line number. */ | |
7248 | stop_pc_sal.line = 0; | |
7249 | infrun_debug_printf ("stepped to a different frame, but " | |
7250 | "it's not the start of a statement"); | |
7251 | } | |
488f131b | 7252 | } |
c906108c | 7253 | |
488f131b | 7254 | /* We aren't done stepping. |
c906108c | 7255 | |
488f131b JB |
7256 | Optimize by setting the stepping range to the line. |
7257 | (We might not be in the original line, but if we entered a | |
7258 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7259 | things like for(;;) statements work better.) |
7260 | ||
7261 | If we entered a SAL that indicates a non-statement line table entry, | |
7262 | then we update the stepping range, but we don't update the step info, | |
7263 | which includes things like the line number we are stepping away from. | |
7264 | This means we will stop when we find a line table entry that is marked | |
7265 | as is-statement, even if it matches the non-statement one we just | |
7266 | stepped into. */ | |
c906108c | 7267 | |
16c381f0 JK |
7268 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7269 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7270 | ecs->event_thread->control.may_range_step = 1; |
8c95582d AB |
7271 | if (refresh_step_info) |
7272 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7273 | |
1eb8556f | 7274 | infrun_debug_printf ("keep going"); |
488f131b | 7275 | keep_going (ecs); |
104c1213 JM |
7276 | } |
7277 | ||
408f6686 PA |
7278 | static bool restart_stepped_thread (process_stratum_target *resume_target, |
7279 | ptid_t resume_ptid); | |
7280 | ||
c447ac0b PA |
7281 | /* In all-stop mode, if we're currently stepping but have stopped in |
7282 | some other thread, we may need to switch back to the stepped | |
7283 | thread. Returns true we set the inferior running, false if we left | |
7284 | it stopped (and the event needs further processing). */ | |
7285 | ||
c4464ade | 7286 | static bool |
c447ac0b PA |
7287 | switch_back_to_stepped_thread (struct execution_control_state *ecs) |
7288 | { | |
fbea99ea | 7289 | if (!target_is_non_stop_p ()) |
c447ac0b | 7290 | { |
99619bea PA |
7291 | /* If any thread is blocked on some internal breakpoint, and we |
7292 | simply need to step over that breakpoint to get it going | |
7293 | again, do that first. */ | |
7294 | ||
7295 | /* However, if we see an event for the stepping thread, then we | |
7296 | know all other threads have been moved past their breakpoints | |
7297 | already. Let the caller check whether the step is finished, | |
7298 | etc., before deciding to move it past a breakpoint. */ | |
7299 | if (ecs->event_thread->control.step_range_end != 0) | |
c4464ade | 7300 | return false; |
99619bea PA |
7301 | |
7302 | /* Check if the current thread is blocked on an incomplete | |
7303 | step-over, interrupted by a random signal. */ | |
7304 | if (ecs->event_thread->control.trap_expected | |
1edb66d8 | 7305 | && ecs->event_thread->stop_signal () != GDB_SIGNAL_TRAP) |
c447ac0b | 7306 | { |
1eb8556f SM |
7307 | infrun_debug_printf |
7308 | ("need to finish step-over of [%s]", | |
7309 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
99619bea | 7310 | keep_going (ecs); |
c4464ade | 7311 | return true; |
99619bea | 7312 | } |
2adfaa28 | 7313 | |
99619bea PA |
7314 | /* Check if the current thread is blocked by a single-step |
7315 | breakpoint of another thread. */ | |
7316 | if (ecs->hit_singlestep_breakpoint) | |
7317 | { | |
1eb8556f SM |
7318 | infrun_debug_printf ("need to step [%s] over single-step breakpoint", |
7319 | target_pid_to_str (ecs->ptid).c_str ()); | |
99619bea | 7320 | keep_going (ecs); |
c4464ade | 7321 | return true; |
99619bea PA |
7322 | } |
7323 | ||
4d9d9d04 PA |
7324 | /* If this thread needs yet another step-over (e.g., stepping |
7325 | through a delay slot), do it first before moving on to | |
7326 | another thread. */ | |
7327 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7328 | { | |
1eb8556f SM |
7329 | infrun_debug_printf |
7330 | ("thread [%s] still needs step-over", | |
7331 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
4d9d9d04 | 7332 | keep_going (ecs); |
c4464ade | 7333 | return true; |
4d9d9d04 | 7334 | } |
70509625 | 7335 | |
483805cf PA |
7336 | /* If scheduler locking applies even if not stepping, there's no |
7337 | need to walk over threads. Above we've checked whether the | |
7338 | current thread is stepping. If some other thread not the | |
7339 | event thread is stepping, then it must be that scheduler | |
7340 | locking is not in effect. */ | |
856e7dd6 | 7341 | if (schedlock_applies (ecs->event_thread)) |
c4464ade | 7342 | return false; |
483805cf | 7343 | |
4d9d9d04 PA |
7344 | /* Otherwise, we no longer expect a trap in the current thread. |
7345 | Clear the trap_expected flag before switching back -- this is | |
7346 | what keep_going does as well, if we call it. */ | |
7347 | ecs->event_thread->control.trap_expected = 0; | |
7348 | ||
7349 | /* Likewise, clear the signal if it should not be passed. */ | |
1edb66d8 SM |
7350 | if (!signal_program[ecs->event_thread->stop_signal ()]) |
7351 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
4d9d9d04 | 7352 | |
408f6686 | 7353 | if (restart_stepped_thread (ecs->target, ecs->ptid)) |
4d9d9d04 PA |
7354 | { |
7355 | prepare_to_wait (ecs); | |
c4464ade | 7356 | return true; |
4d9d9d04 PA |
7357 | } |
7358 | ||
408f6686 PA |
7359 | switch_to_thread (ecs->event_thread); |
7360 | } | |
4d9d9d04 | 7361 | |
408f6686 PA |
7362 | return false; |
7363 | } | |
f3f8ece4 | 7364 | |
408f6686 PA |
7365 | /* Look for the thread that was stepping, and resume it. |
7366 | RESUME_TARGET / RESUME_PTID indicate the set of threads the caller | |
7367 | is resuming. Return true if a thread was started, false | |
7368 | otherwise. */ | |
483805cf | 7369 | |
408f6686 PA |
7370 | static bool |
7371 | restart_stepped_thread (process_stratum_target *resume_target, | |
7372 | ptid_t resume_ptid) | |
7373 | { | |
7374 | /* Do all pending step-overs before actually proceeding with | |
7375 | step/next/etc. */ | |
7376 | if (start_step_over ()) | |
7377 | return true; | |
483805cf | 7378 | |
408f6686 PA |
7379 | for (thread_info *tp : all_threads_safe ()) |
7380 | { | |
7381 | if (tp->state == THREAD_EXITED) | |
7382 | continue; | |
7383 | ||
1edb66d8 | 7384 | if (tp->has_pending_waitstatus ()) |
408f6686 | 7385 | continue; |
483805cf | 7386 | |
408f6686 PA |
7387 | /* Ignore threads of processes the caller is not |
7388 | resuming. */ | |
7389 | if (!sched_multi | |
7390 | && (tp->inf->process_target () != resume_target | |
7391 | || tp->inf->pid != resume_ptid.pid ())) | |
7392 | continue; | |
483805cf | 7393 | |
408f6686 PA |
7394 | if (tp->control.trap_expected) |
7395 | { | |
7396 | infrun_debug_printf ("switching back to stepped thread (step-over)"); | |
483805cf | 7397 | |
408f6686 PA |
7398 | if (keep_going_stepped_thread (tp)) |
7399 | return true; | |
99619bea | 7400 | } |
408f6686 PA |
7401 | } |
7402 | ||
7403 | for (thread_info *tp : all_threads_safe ()) | |
7404 | { | |
7405 | if (tp->state == THREAD_EXITED) | |
7406 | continue; | |
7407 | ||
1edb66d8 | 7408 | if (tp->has_pending_waitstatus ()) |
408f6686 | 7409 | continue; |
99619bea | 7410 | |
408f6686 PA |
7411 | /* Ignore threads of processes the caller is not |
7412 | resuming. */ | |
7413 | if (!sched_multi | |
7414 | && (tp->inf->process_target () != resume_target | |
7415 | || tp->inf->pid != resume_ptid.pid ())) | |
7416 | continue; | |
7417 | ||
7418 | /* Did we find the stepping thread? */ | |
7419 | if (tp->control.step_range_end) | |
99619bea | 7420 | { |
408f6686 | 7421 | infrun_debug_printf ("switching back to stepped thread (stepping)"); |
c447ac0b | 7422 | |
408f6686 PA |
7423 | if (keep_going_stepped_thread (tp)) |
7424 | return true; | |
2ac7589c PA |
7425 | } |
7426 | } | |
2adfaa28 | 7427 | |
c4464ade | 7428 | return false; |
2ac7589c | 7429 | } |
2adfaa28 | 7430 | |
408f6686 PA |
7431 | /* See infrun.h. */ |
7432 | ||
7433 | void | |
7434 | restart_after_all_stop_detach (process_stratum_target *proc_target) | |
7435 | { | |
7436 | /* Note we don't check target_is_non_stop_p() here, because the | |
7437 | current inferior may no longer have a process_stratum target | |
7438 | pushed, as we just detached. */ | |
7439 | ||
7440 | /* See if we have a THREAD_RUNNING thread that need to be | |
7441 | re-resumed. If we have any thread that is already executing, | |
7442 | then we don't need to resume the target -- it is already been | |
7443 | resumed. With the remote target (in all-stop), it's even | |
7444 | impossible to issue another resumption if the target is already | |
7445 | resumed, until the target reports a stop. */ | |
7446 | for (thread_info *thr : all_threads (proc_target)) | |
7447 | { | |
7448 | if (thr->state != THREAD_RUNNING) | |
7449 | continue; | |
7450 | ||
7451 | /* If we have any thread that is already executing, then we | |
7452 | don't need to resume the target -- it is already been | |
7453 | resumed. */ | |
7454 | if (thr->executing) | |
7455 | return; | |
7456 | ||
7457 | /* If we have a pending event to process, skip resuming the | |
7458 | target and go straight to processing it. */ | |
1edb66d8 | 7459 | if (thr->resumed () && thr->has_pending_waitstatus ()) |
408f6686 PA |
7460 | return; |
7461 | } | |
7462 | ||
7463 | /* Alright, we need to re-resume the target. If a thread was | |
7464 | stepping, we need to restart it stepping. */ | |
7465 | if (restart_stepped_thread (proc_target, minus_one_ptid)) | |
7466 | return; | |
7467 | ||
7468 | /* Otherwise, find the first THREAD_RUNNING thread and resume | |
7469 | it. */ | |
7470 | for (thread_info *thr : all_threads (proc_target)) | |
7471 | { | |
7472 | if (thr->state != THREAD_RUNNING) | |
7473 | continue; | |
7474 | ||
7475 | execution_control_state ecs; | |
7476 | reset_ecs (&ecs, thr); | |
7477 | switch_to_thread (thr); | |
7478 | keep_going (&ecs); | |
7479 | return; | |
7480 | } | |
7481 | } | |
7482 | ||
2ac7589c PA |
7483 | /* Set a previously stepped thread back to stepping. Returns true on |
7484 | success, false if the resume is not possible (e.g., the thread | |
7485 | vanished). */ | |
7486 | ||
c4464ade | 7487 | static bool |
2ac7589c PA |
7488 | keep_going_stepped_thread (struct thread_info *tp) |
7489 | { | |
7490 | struct frame_info *frame; | |
2ac7589c PA |
7491 | struct execution_control_state ecss; |
7492 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7493 | |
2ac7589c PA |
7494 | /* If the stepping thread exited, then don't try to switch back and |
7495 | resume it, which could fail in several different ways depending | |
7496 | on the target. Instead, just keep going. | |
2adfaa28 | 7497 | |
2ac7589c PA |
7498 | We can find a stepping dead thread in the thread list in two |
7499 | cases: | |
2adfaa28 | 7500 | |
2ac7589c PA |
7501 | - The target supports thread exit events, and when the target |
7502 | tries to delete the thread from the thread list, inferior_ptid | |
7503 | pointed at the exiting thread. In such case, calling | |
7504 | delete_thread does not really remove the thread from the list; | |
7505 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7506 | |
2ac7589c PA |
7507 | - The target's debug interface does not support thread exit |
7508 | events, and so we have no idea whatsoever if the previously | |
7509 | stepping thread is still alive. For that reason, we need to | |
7510 | synchronously query the target now. */ | |
2adfaa28 | 7511 | |
00431a78 | 7512 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c | 7513 | { |
1eb8556f SM |
7514 | infrun_debug_printf ("not resuming previously stepped thread, it has " |
7515 | "vanished"); | |
2ac7589c | 7516 | |
00431a78 | 7517 | delete_thread (tp); |
c4464ade | 7518 | return false; |
c447ac0b | 7519 | } |
2ac7589c | 7520 | |
1eb8556f | 7521 | infrun_debug_printf ("resuming previously stepped thread"); |
2ac7589c PA |
7522 | |
7523 | reset_ecs (ecs, tp); | |
00431a78 | 7524 | switch_to_thread (tp); |
2ac7589c | 7525 | |
1edb66d8 | 7526 | tp->set_stop_pc (regcache_read_pc (get_thread_regcache (tp))); |
2ac7589c | 7527 | frame = get_current_frame (); |
2ac7589c PA |
7528 | |
7529 | /* If the PC of the thread we were trying to single-step has | |
7530 | changed, then that thread has trapped or been signaled, but the | |
7531 | event has not been reported to GDB yet. Re-poll the target | |
7532 | looking for this particular thread's event (i.e. temporarily | |
7533 | enable schedlock) by: | |
7534 | ||
7535 | - setting a break at the current PC | |
7536 | - resuming that particular thread, only (by setting trap | |
7537 | expected) | |
7538 | ||
7539 | This prevents us continuously moving the single-step breakpoint | |
7540 | forward, one instruction at a time, overstepping. */ | |
7541 | ||
1edb66d8 | 7542 | if (tp->stop_pc () != tp->prev_pc) |
2ac7589c PA |
7543 | { |
7544 | ptid_t resume_ptid; | |
7545 | ||
1eb8556f SM |
7546 | infrun_debug_printf ("expected thread advanced also (%s -> %s)", |
7547 | paddress (target_gdbarch (), tp->prev_pc), | |
1edb66d8 | 7548 | paddress (target_gdbarch (), tp->stop_pc ())); |
2ac7589c PA |
7549 | |
7550 | /* Clear the info of the previous step-over, as it's no longer | |
7551 | valid (if the thread was trying to step over a breakpoint, it | |
7552 | has already succeeded). It's what keep_going would do too, | |
7553 | if we called it. Do this before trying to insert the sss | |
7554 | breakpoint, otherwise if we were previously trying to step | |
7555 | over this exact address in another thread, the breakpoint is | |
7556 | skipped. */ | |
7557 | clear_step_over_info (); | |
7558 | tp->control.trap_expected = 0; | |
7559 | ||
7560 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7561 | get_frame_address_space (frame), | |
1edb66d8 | 7562 | tp->stop_pc ()); |
2ac7589c | 7563 | |
7846f3aa | 7564 | tp->set_resumed (true); |
fbea99ea | 7565 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
c4464ade | 7566 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
2ac7589c PA |
7567 | } |
7568 | else | |
7569 | { | |
1eb8556f | 7570 | infrun_debug_printf ("expected thread still hasn't advanced"); |
2ac7589c PA |
7571 | |
7572 | keep_going_pass_signal (ecs); | |
7573 | } | |
c4464ade SM |
7574 | |
7575 | return true; | |
c447ac0b PA |
7576 | } |
7577 | ||
8b061563 PA |
7578 | /* Is thread TP in the middle of (software or hardware) |
7579 | single-stepping? (Note the result of this function must never be | |
7580 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7581 | |
c4464ade | 7582 | static bool |
b3444185 | 7583 | currently_stepping (struct thread_info *tp) |
a7212384 | 7584 | { |
8358c15c JK |
7585 | return ((tp->control.step_range_end |
7586 | && tp->control.step_resume_breakpoint == NULL) | |
7587 | || tp->control.trap_expected | |
af48d08f | 7588 | || tp->stepped_breakpoint |
8358c15c | 7589 | || bpstat_should_step ()); |
a7212384 UW |
7590 | } |
7591 | ||
b2175913 MS |
7592 | /* Inferior has stepped into a subroutine call with source code that |
7593 | we should not step over. Do step to the first line of code in | |
7594 | it. */ | |
c2c6d25f JM |
7595 | |
7596 | static void | |
568d6575 UW |
7597 | handle_step_into_function (struct gdbarch *gdbarch, |
7598 | struct execution_control_state *ecs) | |
c2c6d25f | 7599 | { |
7e324e48 GB |
7600 | fill_in_stop_func (gdbarch, ecs); |
7601 | ||
f2ffa92b | 7602 | compunit_symtab *cust |
1edb66d8 | 7603 | = find_pc_compunit_symtab (ecs->event_thread->stop_pc ()); |
43f3e411 | 7604 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7605 | ecs->stop_func_start |
7606 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7607 | |
51abb421 | 7608 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7609 | /* Use the step_resume_break to step until the end of the prologue, |
7610 | even if that involves jumps (as it seems to on the vax under | |
7611 | 4.2). */ | |
7612 | /* If the prologue ends in the middle of a source line, continue to | |
7613 | the end of that source line (if it is still within the function). | |
7614 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7615 | if (stop_func_sal.end |
7616 | && stop_func_sal.pc != ecs->stop_func_start | |
7617 | && stop_func_sal.end < ecs->stop_func_end) | |
7618 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7619 | |
2dbd5e30 KB |
7620 | /* Architectures which require breakpoint adjustment might not be able |
7621 | to place a breakpoint at the computed address. If so, the test | |
7622 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7623 | ecs->stop_func_start to an address at which a breakpoint may be | |
7624 | legitimately placed. | |
8fb3e588 | 7625 | |
2dbd5e30 KB |
7626 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7627 | made, GDB will enter an infinite loop when stepping through | |
7628 | optimized code consisting of VLIW instructions which contain | |
7629 | subinstructions corresponding to different source lines. On | |
7630 | FR-V, it's not permitted to place a breakpoint on any but the | |
7631 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7632 | set, GDB will adjust the breakpoint address to the beginning of | |
7633 | the VLIW instruction. Thus, we need to make the corresponding | |
7634 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7635 | |
568d6575 | 7636 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7637 | { |
7638 | ecs->stop_func_start | |
568d6575 | 7639 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7640 | ecs->stop_func_start); |
2dbd5e30 KB |
7641 | } |
7642 | ||
1edb66d8 | 7643 | if (ecs->stop_func_start == ecs->event_thread->stop_pc ()) |
c2c6d25f JM |
7644 | { |
7645 | /* We are already there: stop now. */ | |
bdc36728 | 7646 | end_stepping_range (ecs); |
c2c6d25f JM |
7647 | return; |
7648 | } | |
7649 | else | |
7650 | { | |
7651 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7652 | symtab_and_line sr_sal; |
c2c6d25f JM |
7653 | sr_sal.pc = ecs->stop_func_start; |
7654 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7655 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7656 | |
c2c6d25f | 7657 | /* Do not specify what the fp should be when we stop since on |
dda83cd7 SM |
7658 | some machines the prologue is where the new fp value is |
7659 | established. */ | |
a6d9a66e | 7660 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7661 | |
7662 | /* And make sure stepping stops right away then. */ | |
16c381f0 | 7663 | ecs->event_thread->control.step_range_end |
dda83cd7 | 7664 | = ecs->event_thread->control.step_range_start; |
c2c6d25f JM |
7665 | } |
7666 | keep_going (ecs); | |
7667 | } | |
d4f3574e | 7668 | |
b2175913 MS |
7669 | /* Inferior has stepped backward into a subroutine call with source |
7670 | code that we should not step over. Do step to the beginning of the | |
7671 | last line of code in it. */ | |
7672 | ||
7673 | static void | |
568d6575 UW |
7674 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7675 | struct execution_control_state *ecs) | |
b2175913 | 7676 | { |
43f3e411 | 7677 | struct compunit_symtab *cust; |
167e4384 | 7678 | struct symtab_and_line stop_func_sal; |
b2175913 | 7679 | |
7e324e48 GB |
7680 | fill_in_stop_func (gdbarch, ecs); |
7681 | ||
1edb66d8 | 7682 | cust = find_pc_compunit_symtab (ecs->event_thread->stop_pc ()); |
43f3e411 | 7683 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7684 | ecs->stop_func_start |
7685 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7686 | |
1edb66d8 | 7687 | stop_func_sal = find_pc_line (ecs->event_thread->stop_pc (), 0); |
b2175913 MS |
7688 | |
7689 | /* OK, we're just going to keep stepping here. */ | |
1edb66d8 | 7690 | if (stop_func_sal.pc == ecs->event_thread->stop_pc ()) |
b2175913 MS |
7691 | { |
7692 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7693 | end_stepping_range (ecs); |
b2175913 MS |
7694 | } |
7695 | else | |
7696 | { | |
7697 | /* Else just reset the step range and keep going. | |
7698 | No step-resume breakpoint, they don't work for | |
7699 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7700 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7701 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7702 | keep_going (ecs); |
7703 | } | |
7704 | return; | |
7705 | } | |
7706 | ||
d3169d93 | 7707 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7708 | This is used to both functions and to skip over code. */ |
7709 | ||
7710 | static void | |
2c03e5be PA |
7711 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7712 | struct symtab_and_line sr_sal, | |
7713 | struct frame_id sr_id, | |
7714 | enum bptype sr_type) | |
44cbf7b5 | 7715 | { |
611c83ae PA |
7716 | /* There should never be more than one step-resume or longjmp-resume |
7717 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7718 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7719 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7720 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 | 7721 | |
1eb8556f SM |
7722 | infrun_debug_printf ("inserting step-resume breakpoint at %s", |
7723 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7724 | |
8358c15c | 7725 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7726 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7727 | } |
7728 | ||
9da8c2a0 | 7729 | void |
2c03e5be PA |
7730 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7731 | struct symtab_and_line sr_sal, | |
7732 | struct frame_id sr_id) | |
7733 | { | |
7734 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7735 | sr_sal, sr_id, | |
7736 | bp_step_resume); | |
44cbf7b5 | 7737 | } |
7ce450bd | 7738 | |
2c03e5be PA |
7739 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7740 | This is used to skip a potential signal handler. | |
7ce450bd | 7741 | |
14e60db5 DJ |
7742 | This is called with the interrupted function's frame. The signal |
7743 | handler, when it returns, will resume the interrupted function at | |
7744 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7745 | |
7746 | static void | |
2c03e5be | 7747 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7748 | { |
f4c1edd8 | 7749 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7750 | |
51abb421 PA |
7751 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7752 | ||
7753 | symtab_and_line sr_sal; | |
568d6575 | 7754 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7755 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7756 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7757 | |
2c03e5be PA |
7758 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7759 | get_stack_frame_id (return_frame), | |
7760 | bp_hp_step_resume); | |
d303a6c7 AC |
7761 | } |
7762 | ||
2c03e5be PA |
7763 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7764 | is used to skip a function after stepping into it (for "next" or if | |
7765 | the called function has no debugging information). | |
14e60db5 DJ |
7766 | |
7767 | The current function has almost always been reached by single | |
7768 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7769 | current function, and the breakpoint will be set at the caller's | |
7770 | resume address. | |
7771 | ||
7772 | This is a separate function rather than reusing | |
2c03e5be | 7773 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7774 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7775 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7776 | |
7777 | static void | |
7778 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7779 | { | |
14e60db5 DJ |
7780 | /* We shouldn't have gotten here if we don't know where the call site |
7781 | is. */ | |
c7ce8faa | 7782 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7783 | |
51abb421 | 7784 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7785 | |
51abb421 | 7786 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7787 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7788 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7789 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7790 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7791 | |
a6d9a66e | 7792 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7793 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7794 | } |
7795 | ||
611c83ae PA |
7796 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7797 | new breakpoint at the target of a jmp_buf. The handling of | |
7798 | longjmp-resume uses the same mechanisms used for handling | |
7799 | "step-resume" breakpoints. */ | |
7800 | ||
7801 | static void | |
a6d9a66e | 7802 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7803 | { |
e81a37f7 TT |
7804 | /* There should never be more than one longjmp-resume breakpoint per |
7805 | thread, so we should never be setting a new | |
611c83ae | 7806 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7807 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae | 7808 | |
1eb8556f SM |
7809 | infrun_debug_printf ("inserting longjmp-resume breakpoint at %s", |
7810 | paddress (gdbarch, pc)); | |
611c83ae | 7811 | |
e81a37f7 | 7812 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7813 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7814 | } |
7815 | ||
186c406b TT |
7816 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7817 | the exception. The block B is the block of the unwinder debug hook | |
7818 | function. FRAME is the frame corresponding to the call to this | |
7819 | function. SYM is the symbol of the function argument holding the | |
7820 | target PC of the exception. */ | |
7821 | ||
7822 | static void | |
7823 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7824 | const struct block *b, |
186c406b TT |
7825 | struct frame_info *frame, |
7826 | struct symbol *sym) | |
7827 | { | |
a70b8144 | 7828 | try |
186c406b | 7829 | { |
63e43d3a | 7830 | struct block_symbol vsym; |
186c406b TT |
7831 | struct value *value; |
7832 | CORE_ADDR handler; | |
7833 | struct breakpoint *bp; | |
7834 | ||
987012b8 | 7835 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 7836 | b, VAR_DOMAIN); |
63e43d3a | 7837 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7838 | /* If the value was optimized out, revert to the old behavior. */ |
7839 | if (! value_optimized_out (value)) | |
7840 | { | |
7841 | handler = value_as_address (value); | |
7842 | ||
1eb8556f SM |
7843 | infrun_debug_printf ("exception resume at %lx", |
7844 | (unsigned long) handler); | |
186c406b TT |
7845 | |
7846 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7847 | handler, |
7848 | bp_exception_resume).release (); | |
c70a6932 JK |
7849 | |
7850 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7851 | frame = NULL; | |
7852 | ||
5d5658a1 | 7853 | bp->thread = tp->global_num; |
186c406b TT |
7854 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7855 | } | |
7856 | } | |
230d2906 | 7857 | catch (const gdb_exception_error &e) |
492d29ea PA |
7858 | { |
7859 | /* We want to ignore errors here. */ | |
7860 | } | |
186c406b TT |
7861 | } |
7862 | ||
28106bc2 SDJ |
7863 | /* A helper for check_exception_resume that sets an |
7864 | exception-breakpoint based on a SystemTap probe. */ | |
7865 | ||
7866 | static void | |
7867 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7868 | const struct bound_probe *probe, |
28106bc2 SDJ |
7869 | struct frame_info *frame) |
7870 | { | |
7871 | struct value *arg_value; | |
7872 | CORE_ADDR handler; | |
7873 | struct breakpoint *bp; | |
7874 | ||
7875 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7876 | if (!arg_value) | |
7877 | return; | |
7878 | ||
7879 | handler = value_as_address (arg_value); | |
7880 | ||
1eb8556f SM |
7881 | infrun_debug_printf ("exception resume at %s", |
7882 | paddress (probe->objfile->arch (), handler)); | |
28106bc2 SDJ |
7883 | |
7884 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7885 | handler, bp_exception_resume).release (); |
5d5658a1 | 7886 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7887 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7888 | } | |
7889 | ||
186c406b TT |
7890 | /* This is called when an exception has been intercepted. Check to |
7891 | see whether the exception's destination is of interest, and if so, | |
7892 | set an exception resume breakpoint there. */ | |
7893 | ||
7894 | static void | |
7895 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7896 | struct frame_info *frame) |
186c406b | 7897 | { |
729662a5 | 7898 | struct bound_probe probe; |
28106bc2 SDJ |
7899 | struct symbol *func; |
7900 | ||
7901 | /* First see if this exception unwinding breakpoint was set via a | |
7902 | SystemTap probe point. If so, the probe has two arguments: the | |
7903 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7904 | set a breakpoint there. */ | |
6bac7473 | 7905 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7906 | if (probe.prob) |
28106bc2 | 7907 | { |
729662a5 | 7908 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7909 | return; |
7910 | } | |
7911 | ||
7912 | func = get_frame_function (frame); | |
7913 | if (!func) | |
7914 | return; | |
186c406b | 7915 | |
a70b8144 | 7916 | try |
186c406b | 7917 | { |
3977b71f | 7918 | const struct block *b; |
8157b174 | 7919 | struct block_iterator iter; |
186c406b TT |
7920 | struct symbol *sym; |
7921 | int argno = 0; | |
7922 | ||
7923 | /* The exception breakpoint is a thread-specific breakpoint on | |
7924 | the unwinder's debug hook, declared as: | |
7925 | ||
7926 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7927 | ||
7928 | The CFA argument indicates the frame to which control is | |
7929 | about to be transferred. HANDLER is the destination PC. | |
7930 | ||
7931 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7932 | This is not extremely efficient but it avoids issues in gdb | |
7933 | with computing the DWARF CFA, and it also works even in weird | |
7934 | cases such as throwing an exception from inside a signal | |
7935 | handler. */ | |
7936 | ||
7937 | b = SYMBOL_BLOCK_VALUE (func); | |
7938 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7939 | { | |
7940 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7941 | continue; | |
7942 | ||
7943 | if (argno == 0) | |
7944 | ++argno; | |
7945 | else | |
7946 | { | |
7947 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7948 | b, frame, sym); | |
7949 | break; | |
7950 | } | |
7951 | } | |
7952 | } | |
230d2906 | 7953 | catch (const gdb_exception_error &e) |
492d29ea PA |
7954 | { |
7955 | } | |
186c406b TT |
7956 | } |
7957 | ||
104c1213 | 7958 | static void |
22bcd14b | 7959 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7960 | { |
1eb8556f | 7961 | infrun_debug_printf ("stop_waiting"); |
527159b7 | 7962 | |
cd0fc7c3 SS |
7963 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7964 | ecs->wait_some_more = 0; | |
fbea99ea | 7965 | |
53cccef1 | 7966 | /* If all-stop, but there exists a non-stop target, stop all |
fbea99ea | 7967 | threads now that we're presenting the stop to the user. */ |
53cccef1 | 7968 | if (!non_stop && exists_non_stop_target ()) |
fbea99ea | 7969 | stop_all_threads (); |
cd0fc7c3 SS |
7970 | } |
7971 | ||
4d9d9d04 PA |
7972 | /* Like keep_going, but passes the signal to the inferior, even if the |
7973 | signal is set to nopass. */ | |
d4f3574e SS |
7974 | |
7975 | static void | |
4d9d9d04 | 7976 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7977 | { |
d7e15655 | 7978 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
7846f3aa | 7979 | gdb_assert (!ecs->event_thread->resumed ()); |
4d9d9d04 | 7980 | |
d4f3574e | 7981 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 7982 | ecs->event_thread->prev_pc |
fc75c28b | 7983 | = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 7984 | |
4d9d9d04 | 7985 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7986 | { |
4d9d9d04 PA |
7987 | struct thread_info *tp = ecs->event_thread; |
7988 | ||
1eb8556f SM |
7989 | infrun_debug_printf ("%s has trap_expected set, " |
7990 | "resuming to collect trap", | |
7991 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 | 7992 | |
a9ba6bae PA |
7993 | /* We haven't yet gotten our trap, and either: intercepted a |
7994 | non-signal event (e.g., a fork); or took a signal which we | |
7995 | are supposed to pass through to the inferior. Simply | |
7996 | continue. */ | |
1edb66d8 | 7997 | resume (ecs->event_thread->stop_signal ()); |
d4f3574e | 7998 | } |
372316f1 PA |
7999 | else if (step_over_info_valid_p ()) |
8000 | { | |
8001 | /* Another thread is stepping over a breakpoint in-line. If | |
8002 | this thread needs a step-over too, queue the request. In | |
8003 | either case, this resume must be deferred for later. */ | |
8004 | struct thread_info *tp = ecs->event_thread; | |
8005 | ||
8006 | if (ecs->hit_singlestep_breakpoint | |
8007 | || thread_still_needs_step_over (tp)) | |
8008 | { | |
1eb8556f SM |
8009 | infrun_debug_printf ("step-over already in progress: " |
8010 | "step-over for %s deferred", | |
8011 | target_pid_to_str (tp->ptid).c_str ()); | |
28d5518b | 8012 | global_thread_step_over_chain_enqueue (tp); |
372316f1 PA |
8013 | } |
8014 | else | |
8015 | { | |
1eb8556f SM |
8016 | infrun_debug_printf ("step-over in progress: resume of %s deferred", |
8017 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 8018 | } |
372316f1 | 8019 | } |
d4f3574e SS |
8020 | else |
8021 | { | |
31e77af2 | 8022 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
8023 | int remove_bp; |
8024 | int remove_wps; | |
8d297bbf | 8025 | step_over_what step_what; |
31e77af2 | 8026 | |
d4f3574e | 8027 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
8028 | anyway (if we got a signal, the user asked it be passed to |
8029 | the child) | |
8030 | -- or -- | |
8031 | We got our expected trap, but decided we should resume from | |
8032 | it. | |
d4f3574e | 8033 | |
a9ba6bae | 8034 | We're going to run this baby now! |
d4f3574e | 8035 | |
c36b740a VP |
8036 | Note that insert_breakpoints won't try to re-insert |
8037 | already inserted breakpoints. Therefore, we don't | |
8038 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 8039 | |
31e77af2 PA |
8040 | /* If we need to step over a breakpoint, and we're not using |
8041 | displaced stepping to do so, insert all breakpoints | |
8042 | (watchpoints, etc.) but the one we're stepping over, step one | |
8043 | instruction, and then re-insert the breakpoint when that step | |
8044 | is finished. */ | |
963f9c80 | 8045 | |
6c4cfb24 PA |
8046 | step_what = thread_still_needs_step_over (ecs->event_thread); |
8047 | ||
963f9c80 | 8048 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
8049 | || (step_what & STEP_OVER_BREAKPOINT)); |
8050 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 8051 | |
cb71640d PA |
8052 | /* We can't use displaced stepping if we need to step past a |
8053 | watchpoint. The instruction copied to the scratch pad would | |
8054 | still trigger the watchpoint. */ | |
8055 | if (remove_bp | |
3fc8eb30 | 8056 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 8057 | { |
a01bda52 | 8058 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
8059 | regcache_read_pc (regcache), remove_wps, |
8060 | ecs->event_thread->global_num); | |
45e8c884 | 8061 | } |
963f9c80 | 8062 | else if (remove_wps) |
21edc42f | 8063 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
8064 | |
8065 | /* If we now need to do an in-line step-over, we need to stop | |
8066 | all other threads. Note this must be done before | |
8067 | insert_breakpoints below, because that removes the breakpoint | |
8068 | we're about to step over, otherwise other threads could miss | |
8069 | it. */ | |
fbea99ea | 8070 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 8071 | stop_all_threads (); |
abbb1732 | 8072 | |
31e77af2 | 8073 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 8074 | try |
31e77af2 PA |
8075 | { |
8076 | insert_breakpoints (); | |
8077 | } | |
230d2906 | 8078 | catch (const gdb_exception_error &e) |
31e77af2 PA |
8079 | { |
8080 | exception_print (gdb_stderr, e); | |
22bcd14b | 8081 | stop_waiting (ecs); |
bdf2a94a | 8082 | clear_step_over_info (); |
31e77af2 | 8083 | return; |
d4f3574e SS |
8084 | } |
8085 | ||
963f9c80 | 8086 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 8087 | |
1edb66d8 | 8088 | resume (ecs->event_thread->stop_signal ()); |
d4f3574e SS |
8089 | } |
8090 | ||
488f131b | 8091 | prepare_to_wait (ecs); |
d4f3574e SS |
8092 | } |
8093 | ||
4d9d9d04 PA |
8094 | /* Called when we should continue running the inferior, because the |
8095 | current event doesn't cause a user visible stop. This does the | |
8096 | resuming part; waiting for the next event is done elsewhere. */ | |
8097 | ||
8098 | static void | |
8099 | keep_going (struct execution_control_state *ecs) | |
8100 | { | |
8101 | if (ecs->event_thread->control.trap_expected | |
1edb66d8 | 8102 | && ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP) |
4d9d9d04 PA |
8103 | ecs->event_thread->control.trap_expected = 0; |
8104 | ||
1edb66d8 SM |
8105 | if (!signal_program[ecs->event_thread->stop_signal ()]) |
8106 | ecs->event_thread->set_stop_signal (GDB_SIGNAL_0); | |
4d9d9d04 PA |
8107 | keep_going_pass_signal (ecs); |
8108 | } | |
8109 | ||
104c1213 JM |
8110 | /* This function normally comes after a resume, before |
8111 | handle_inferior_event exits. It takes care of any last bits of | |
8112 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 8113 | |
104c1213 JM |
8114 | static void |
8115 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 8116 | { |
1eb8556f | 8117 | infrun_debug_printf ("prepare_to_wait"); |
104c1213 | 8118 | |
104c1213 | 8119 | ecs->wait_some_more = 1; |
0b333c5e | 8120 | |
42bd97a6 PA |
8121 | /* If the target can't async, emulate it by marking the infrun event |
8122 | handler such that as soon as we get back to the event-loop, we | |
8123 | immediately end up in fetch_inferior_event again calling | |
8124 | target_wait. */ | |
8125 | if (!target_can_async_p ()) | |
0b333c5e | 8126 | mark_infrun_async_event_handler (); |
c906108c | 8127 | } |
11cf8741 | 8128 | |
fd664c91 | 8129 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 8130 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
8131 | |
8132 | static void | |
bdc36728 | 8133 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 8134 | { |
bdc36728 | 8135 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 8136 | stop_waiting (ecs); |
fd664c91 PA |
8137 | } |
8138 | ||
33d62d64 JK |
8139 | /* Several print_*_reason functions to print why the inferior has stopped. |
8140 | We always print something when the inferior exits, or receives a signal. | |
8141 | The rest of the cases are dealt with later on in normal_stop and | |
8142 | print_it_typical. Ideally there should be a call to one of these | |
8143 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 8144 | stop_waiting is called. |
33d62d64 | 8145 | |
fd664c91 PA |
8146 | Note that we don't call these directly, instead we delegate that to |
8147 | the interpreters, through observers. Interpreters then call these | |
8148 | with whatever uiout is right. */ | |
33d62d64 | 8149 | |
fd664c91 PA |
8150 | void |
8151 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 8152 | { |
fd664c91 | 8153 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 8154 | |
112e8700 | 8155 | if (uiout->is_mi_like_p ()) |
fd664c91 | 8156 | { |
112e8700 | 8157 | uiout->field_string ("reason", |
fd664c91 PA |
8158 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
8159 | } | |
8160 | } | |
33d62d64 | 8161 | |
fd664c91 PA |
8162 | void |
8163 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 8164 | { |
33d62d64 | 8165 | annotate_signalled (); |
112e8700 SM |
8166 | if (uiout->is_mi_like_p ()) |
8167 | uiout->field_string | |
8168 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8169 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 8170 | annotate_signal_name (); |
112e8700 | 8171 | uiout->field_string ("signal-name", |
2ea28649 | 8172 | gdb_signal_to_name (siggnal)); |
33d62d64 | 8173 | annotate_signal_name_end (); |
112e8700 | 8174 | uiout->text (", "); |
33d62d64 | 8175 | annotate_signal_string (); |
112e8700 | 8176 | uiout->field_string ("signal-meaning", |
2ea28649 | 8177 | gdb_signal_to_string (siggnal)); |
33d62d64 | 8178 | annotate_signal_string_end (); |
112e8700 SM |
8179 | uiout->text (".\n"); |
8180 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
8181 | } |
8182 | ||
fd664c91 PA |
8183 | void |
8184 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 8185 | { |
fda326dd | 8186 | struct inferior *inf = current_inferior (); |
a068643d | 8187 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 8188 | |
33d62d64 JK |
8189 | annotate_exited (exitstatus); |
8190 | if (exitstatus) | |
8191 | { | |
112e8700 SM |
8192 | if (uiout->is_mi_like_p ()) |
8193 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
8194 | std::string exit_code_str |
8195 | = string_printf ("0%o", (unsigned int) exitstatus); | |
8196 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
8197 | plongest (inf->num), pidstr.c_str (), | |
8198 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
8199 | } |
8200 | else | |
11cf8741 | 8201 | { |
112e8700 SM |
8202 | if (uiout->is_mi_like_p ()) |
8203 | uiout->field_string | |
8204 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
8205 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
8206 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 8207 | } |
33d62d64 JK |
8208 | } |
8209 | ||
fd664c91 PA |
8210 | void |
8211 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 8212 | { |
f303dbd6 PA |
8213 | struct thread_info *thr = inferior_thread (); |
8214 | ||
33d62d64 JK |
8215 | annotate_signal (); |
8216 | ||
112e8700 | 8217 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
8218 | ; |
8219 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 8220 | { |
f303dbd6 | 8221 | const char *name; |
33d62d64 | 8222 | |
112e8700 | 8223 | uiout->text ("\nThread "); |
33eca680 | 8224 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 PA |
8225 | |
8226 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
8227 | if (name != NULL) | |
8228 | { | |
112e8700 | 8229 | uiout->text (" \""); |
33eca680 | 8230 | uiout->field_string ("name", name); |
112e8700 | 8231 | uiout->text ("\""); |
f303dbd6 | 8232 | } |
33d62d64 | 8233 | } |
f303dbd6 | 8234 | else |
112e8700 | 8235 | uiout->text ("\nProgram"); |
f303dbd6 | 8236 | |
112e8700 SM |
8237 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8238 | uiout->text (" stopped"); | |
33d62d64 JK |
8239 | else |
8240 | { | |
112e8700 | 8241 | uiout->text (" received signal "); |
8b93c638 | 8242 | annotate_signal_name (); |
112e8700 SM |
8243 | if (uiout->is_mi_like_p ()) |
8244 | uiout->field_string | |
8245 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8246 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8247 | annotate_signal_name_end (); |
112e8700 | 8248 | uiout->text (", "); |
8b93c638 | 8249 | annotate_signal_string (); |
112e8700 | 8250 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 | 8251 | |
272bb05c JB |
8252 | struct regcache *regcache = get_current_regcache (); |
8253 | struct gdbarch *gdbarch = regcache->arch (); | |
8254 | if (gdbarch_report_signal_info_p (gdbarch)) | |
8255 | gdbarch_report_signal_info (gdbarch, uiout, siggnal); | |
8256 | ||
8b93c638 | 8257 | annotate_signal_string_end (); |
33d62d64 | 8258 | } |
112e8700 | 8259 | uiout->text (".\n"); |
33d62d64 | 8260 | } |
252fbfc8 | 8261 | |
fd664c91 PA |
8262 | void |
8263 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8264 | { |
112e8700 | 8265 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8266 | } |
43ff13b4 | 8267 | |
0c7e1a46 PA |
8268 | /* Print current location without a level number, if we have changed |
8269 | functions or hit a breakpoint. Print source line if we have one. | |
8270 | bpstat_print contains the logic deciding in detail what to print, | |
8271 | based on the event(s) that just occurred. */ | |
8272 | ||
243a9253 PA |
8273 | static void |
8274 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8275 | { |
8276 | int bpstat_ret; | |
f486487f | 8277 | enum print_what source_flag; |
0c7e1a46 PA |
8278 | int do_frame_printing = 1; |
8279 | struct thread_info *tp = inferior_thread (); | |
8280 | ||
8281 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8282 | switch (bpstat_ret) | |
8283 | { | |
8284 | case PRINT_UNKNOWN: | |
8285 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8286 | should) carry around the function and does (or should) use | |
8287 | that when doing a frame comparison. */ | |
8288 | if (tp->control.stop_step | |
8289 | && frame_id_eq (tp->control.step_frame_id, | |
8290 | get_frame_id (get_current_frame ())) | |
f2ffa92b | 8291 | && (tp->control.step_start_function |
1edb66d8 | 8292 | == find_pc_function (tp->stop_pc ()))) |
0c7e1a46 PA |
8293 | { |
8294 | /* Finished step, just print source line. */ | |
8295 | source_flag = SRC_LINE; | |
8296 | } | |
8297 | else | |
8298 | { | |
8299 | /* Print location and source line. */ | |
8300 | source_flag = SRC_AND_LOC; | |
8301 | } | |
8302 | break; | |
8303 | case PRINT_SRC_AND_LOC: | |
8304 | /* Print location and source line. */ | |
8305 | source_flag = SRC_AND_LOC; | |
8306 | break; | |
8307 | case PRINT_SRC_ONLY: | |
8308 | source_flag = SRC_LINE; | |
8309 | break; | |
8310 | case PRINT_NOTHING: | |
8311 | /* Something bogus. */ | |
8312 | source_flag = SRC_LINE; | |
8313 | do_frame_printing = 0; | |
8314 | break; | |
8315 | default: | |
8316 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8317 | } | |
8318 | ||
8319 | /* The behavior of this routine with respect to the source | |
8320 | flag is: | |
8321 | SRC_LINE: Print only source line | |
8322 | LOCATION: Print only location | |
8323 | SRC_AND_LOC: Print location and source line. */ | |
8324 | if (do_frame_printing) | |
8325 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8326 | } |
8327 | ||
243a9253 PA |
8328 | /* See infrun.h. */ |
8329 | ||
8330 | void | |
4c7d57e7 | 8331 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8332 | { |
243a9253 | 8333 | struct target_waitstatus last; |
243a9253 PA |
8334 | struct thread_info *tp; |
8335 | ||
5b6d1e4f | 8336 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8337 | |
67ad9399 TT |
8338 | { |
8339 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8340 | |
67ad9399 | 8341 | print_stop_location (&last); |
243a9253 | 8342 | |
67ad9399 | 8343 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8344 | if (displays) |
8345 | do_displays (); | |
67ad9399 | 8346 | } |
243a9253 PA |
8347 | |
8348 | tp = inferior_thread (); | |
8349 | if (tp->thread_fsm != NULL | |
46e3ed7f | 8350 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
8351 | { |
8352 | struct return_value_info *rv; | |
8353 | ||
46e3ed7f | 8354 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
8355 | if (rv != NULL) |
8356 | print_return_value (uiout, rv); | |
8357 | } | |
0c7e1a46 PA |
8358 | } |
8359 | ||
388a7084 PA |
8360 | /* See infrun.h. */ |
8361 | ||
8362 | void | |
8363 | maybe_remove_breakpoints (void) | |
8364 | { | |
55f6301a | 8365 | if (!breakpoints_should_be_inserted_now () && target_has_execution ()) |
388a7084 PA |
8366 | { |
8367 | if (remove_breakpoints ()) | |
8368 | { | |
223ffa71 | 8369 | target_terminal::ours_for_output (); |
388a7084 PA |
8370 | printf_filtered (_("Cannot remove breakpoints because " |
8371 | "program is no longer writable.\nFurther " | |
8372 | "execution is probably impossible.\n")); | |
8373 | } | |
8374 | } | |
8375 | } | |
8376 | ||
4c2f2a79 PA |
8377 | /* The execution context that just caused a normal stop. */ |
8378 | ||
8379 | struct stop_context | |
8380 | { | |
2d844eaf | 8381 | stop_context (); |
2d844eaf TT |
8382 | |
8383 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8384 | ||
8385 | bool changed () const; | |
8386 | ||
4c2f2a79 PA |
8387 | /* The stop ID. */ |
8388 | ULONGEST stop_id; | |
c906108c | 8389 | |
4c2f2a79 | 8390 | /* The event PTID. */ |
c906108c | 8391 | |
4c2f2a79 PA |
8392 | ptid_t ptid; |
8393 | ||
8394 | /* If stopp for a thread event, this is the thread that caused the | |
8395 | stop. */ | |
d634cd0b | 8396 | thread_info_ref thread; |
4c2f2a79 PA |
8397 | |
8398 | /* The inferior that caused the stop. */ | |
8399 | int inf_num; | |
8400 | }; | |
8401 | ||
2d844eaf | 8402 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8403 | takes a strong reference to the thread. */ |
8404 | ||
2d844eaf | 8405 | stop_context::stop_context () |
4c2f2a79 | 8406 | { |
2d844eaf TT |
8407 | stop_id = get_stop_id (); |
8408 | ptid = inferior_ptid; | |
8409 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8410 | |
d7e15655 | 8411 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8412 | { |
8413 | /* Take a strong reference so that the thread can't be deleted | |
8414 | yet. */ | |
d634cd0b | 8415 | thread = thread_info_ref::new_reference (inferior_thread ()); |
4c2f2a79 | 8416 | } |
4c2f2a79 PA |
8417 | } |
8418 | ||
8419 | /* Return true if the current context no longer matches the saved stop | |
8420 | context. */ | |
8421 | ||
2d844eaf TT |
8422 | bool |
8423 | stop_context::changed () const | |
8424 | { | |
8425 | if (ptid != inferior_ptid) | |
8426 | return true; | |
8427 | if (inf_num != current_inferior ()->num) | |
8428 | return true; | |
8429 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8430 | return true; | |
8431 | if (get_stop_id () != stop_id) | |
8432 | return true; | |
8433 | return false; | |
4c2f2a79 PA |
8434 | } |
8435 | ||
8436 | /* See infrun.h. */ | |
8437 | ||
8438 | int | |
96baa820 | 8439 | normal_stop (void) |
c906108c | 8440 | { |
73b65bb0 | 8441 | struct target_waitstatus last; |
73b65bb0 | 8442 | |
5b6d1e4f | 8443 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8444 | |
4c2f2a79 PA |
8445 | new_stop_id (); |
8446 | ||
29f49a6a PA |
8447 | /* If an exception is thrown from this point on, make sure to |
8448 | propagate GDB's knowledge of the executing state to the | |
8449 | frontend/user running state. A QUIT is an easy exception to see | |
8450 | here, so do this before any filtered output. */ | |
731f534f | 8451 | |
5b6d1e4f | 8452 | ptid_t finish_ptid = null_ptid; |
731f534f | 8453 | |
c35b1492 | 8454 | if (!non_stop) |
5b6d1e4f | 8455 | finish_ptid = minus_one_ptid; |
e1316e60 PA |
8456 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8457 | || last.kind == TARGET_WAITKIND_EXITED) | |
8458 | { | |
8459 | /* On some targets, we may still have live threads in the | |
8460 | inferior when we get a process exit event. E.g., for | |
8461 | "checkpoint", when the current checkpoint/fork exits, | |
8462 | linux-fork.c automatically switches to another fork from | |
8463 | within target_mourn_inferior. */ | |
731f534f | 8464 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8465 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 PA |
8466 | } |
8467 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5b6d1e4f PA |
8468 | finish_ptid = inferior_ptid; |
8469 | ||
8470 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8471 | if (finish_ptid != null_ptid) | |
8472 | { | |
8473 | maybe_finish_thread_state.emplace | |
8474 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8475 | } | |
29f49a6a | 8476 | |
b57bacec PA |
8477 | /* As we're presenting a stop, and potentially removing breakpoints, |
8478 | update the thread list so we can tell whether there are threads | |
8479 | running on the target. With target remote, for example, we can | |
8480 | only learn about new threads when we explicitly update the thread | |
8481 | list. Do this before notifying the interpreters about signal | |
8482 | stops, end of stepping ranges, etc., so that the "new thread" | |
8483 | output is emitted before e.g., "Program received signal FOO", | |
8484 | instead of after. */ | |
8485 | update_thread_list (); | |
8486 | ||
8487 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
1edb66d8 | 8488 | gdb::observers::signal_received.notify (inferior_thread ()->stop_signal ()); |
b57bacec | 8489 | |
c906108c SS |
8490 | /* As with the notification of thread events, we want to delay |
8491 | notifying the user that we've switched thread context until | |
8492 | the inferior actually stops. | |
8493 | ||
73b65bb0 DJ |
8494 | There's no point in saying anything if the inferior has exited. |
8495 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8496 | "received a signal". |
8497 | ||
8498 | Also skip saying anything in non-stop mode. In that mode, as we | |
8499 | don't want GDB to switch threads behind the user's back, to avoid | |
8500 | races where the user is typing a command to apply to thread x, | |
8501 | but GDB switches to thread y before the user finishes entering | |
8502 | the command, fetch_inferior_event installs a cleanup to restore | |
8503 | the current thread back to the thread the user had selected right | |
8504 | after this event is handled, so we're not really switching, only | |
8505 | informing of a stop. */ | |
4f8d22e3 | 8506 | if (!non_stop |
731f534f | 8507 | && previous_inferior_ptid != inferior_ptid |
55f6301a | 8508 | && target_has_execution () |
73b65bb0 | 8509 | && last.kind != TARGET_WAITKIND_SIGNALLED |
0e5bf2a8 PA |
8510 | && last.kind != TARGET_WAITKIND_EXITED |
8511 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8512 | { |
0e454242 | 8513 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8514 | { |
223ffa71 | 8515 | target_terminal::ours_for_output (); |
3b12939d | 8516 | printf_filtered (_("[Switching to %s]\n"), |
a068643d | 8517 | target_pid_to_str (inferior_ptid).c_str ()); |
3b12939d PA |
8518 | annotate_thread_changed (); |
8519 | } | |
39f77062 | 8520 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8521 | } |
c906108c | 8522 | |
0e5bf2a8 PA |
8523 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8524 | { | |
0e454242 | 8525 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8526 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8527 | { | |
223ffa71 | 8528 | target_terminal::ours_for_output (); |
3b12939d PA |
8529 | printf_filtered (_("No unwaited-for children left.\n")); |
8530 | } | |
0e5bf2a8 PA |
8531 | } |
8532 | ||
b57bacec | 8533 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8534 | maybe_remove_breakpoints (); |
c906108c | 8535 | |
c906108c SS |
8536 | /* If an auto-display called a function and that got a signal, |
8537 | delete that auto-display to avoid an infinite recursion. */ | |
8538 | ||
8539 | if (stopped_by_random_signal) | |
8540 | disable_current_display (); | |
8541 | ||
0e454242 | 8542 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8543 | { |
8544 | async_enable_stdin (); | |
8545 | } | |
c906108c | 8546 | |
388a7084 | 8547 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8548 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8549 | |
8550 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8551 | and current location is based on that. Handle the case where the | |
8552 | dummy call is returning after being stopped. E.g. the dummy call | |
8553 | previously hit a breakpoint. (If the dummy call returns | |
8554 | normally, we won't reach here.) Do this before the stop hook is | |
8555 | run, so that it doesn't get to see the temporary dummy frame, | |
8556 | which is not where we'll present the stop. */ | |
8557 | if (has_stack_frames ()) | |
8558 | { | |
8559 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8560 | { | |
8561 | /* Pop the empty frame that contains the stack dummy. This | |
8562 | also restores inferior state prior to the call (struct | |
8563 | infcall_suspend_state). */ | |
8564 | struct frame_info *frame = get_current_frame (); | |
8565 | ||
8566 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8567 | frame_pop (frame); | |
8568 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8569 | does which means there's now no selected frame. */ | |
8570 | } | |
8571 | ||
8572 | select_frame (get_current_frame ()); | |
8573 | ||
8574 | /* Set the current source location. */ | |
8575 | set_current_sal_from_frame (get_current_frame ()); | |
8576 | } | |
dd7e2d2b PA |
8577 | |
8578 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8579 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8580 | if (stop_command != NULL) |
8581 | { | |
2d844eaf | 8582 | stop_context saved_context; |
4c2f2a79 | 8583 | |
a70b8144 | 8584 | try |
bf469271 PA |
8585 | { |
8586 | execute_cmd_pre_hook (stop_command); | |
8587 | } | |
230d2906 | 8588 | catch (const gdb_exception &ex) |
bf469271 PA |
8589 | { |
8590 | exception_fprintf (gdb_stderr, ex, | |
8591 | "Error while running hook_stop:\n"); | |
8592 | } | |
4c2f2a79 PA |
8593 | |
8594 | /* If the stop hook resumes the target, then there's no point in | |
8595 | trying to notify about the previous stop; its context is | |
8596 | gone. Likewise if the command switches thread or inferior -- | |
8597 | the observers would print a stop for the wrong | |
8598 | thread/inferior. */ | |
2d844eaf TT |
8599 | if (saved_context.changed ()) |
8600 | return 1; | |
4c2f2a79 | 8601 | } |
dd7e2d2b | 8602 | |
388a7084 PA |
8603 | /* Notify observers about the stop. This is where the interpreters |
8604 | print the stop event. */ | |
d7e15655 | 8605 | if (inferior_ptid != null_ptid) |
76727919 | 8606 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
24a7f1b5 | 8607 | stop_print_frame); |
388a7084 | 8608 | else |
76727919 | 8609 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8610 | |
243a9253 PA |
8611 | annotate_stopped (); |
8612 | ||
55f6301a | 8613 | if (target_has_execution ()) |
48844aa6 PA |
8614 | { |
8615 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
fe726667 PA |
8616 | && last.kind != TARGET_WAITKIND_EXITED |
8617 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8618 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8619 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8620 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8621 | } |
6c95b8df PA |
8622 | |
8623 | /* Try to get rid of automatically added inferiors that are no | |
8624 | longer needed. Keeping those around slows down things linearly. | |
8625 | Note that this never removes the current inferior. */ | |
8626 | prune_inferiors (); | |
4c2f2a79 PA |
8627 | |
8628 | return 0; | |
c906108c | 8629 | } |
c906108c | 8630 | \f |
c5aa993b | 8631 | int |
96baa820 | 8632 | signal_stop_state (int signo) |
c906108c | 8633 | { |
d6b48e9c | 8634 | return signal_stop[signo]; |
c906108c SS |
8635 | } |
8636 | ||
c5aa993b | 8637 | int |
96baa820 | 8638 | signal_print_state (int signo) |
c906108c SS |
8639 | { |
8640 | return signal_print[signo]; | |
8641 | } | |
8642 | ||
c5aa993b | 8643 | int |
96baa820 | 8644 | signal_pass_state (int signo) |
c906108c SS |
8645 | { |
8646 | return signal_program[signo]; | |
8647 | } | |
8648 | ||
2455069d UW |
8649 | static void |
8650 | signal_cache_update (int signo) | |
8651 | { | |
8652 | if (signo == -1) | |
8653 | { | |
a493e3e2 | 8654 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8655 | signal_cache_update (signo); |
8656 | ||
8657 | return; | |
8658 | } | |
8659 | ||
8660 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8661 | && signal_print[signo] == 0 | |
ab04a2af TT |
8662 | && signal_program[signo] == 1 |
8663 | && signal_catch[signo] == 0); | |
2455069d UW |
8664 | } |
8665 | ||
488f131b | 8666 | int |
7bda5e4a | 8667 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8668 | { |
8669 | int ret = signal_stop[signo]; | |
abbb1732 | 8670 | |
d4f3574e | 8671 | signal_stop[signo] = state; |
2455069d | 8672 | signal_cache_update (signo); |
d4f3574e SS |
8673 | return ret; |
8674 | } | |
8675 | ||
488f131b | 8676 | int |
7bda5e4a | 8677 | signal_print_update (int signo, int state) |
d4f3574e SS |
8678 | { |
8679 | int ret = signal_print[signo]; | |
abbb1732 | 8680 | |
d4f3574e | 8681 | signal_print[signo] = state; |
2455069d | 8682 | signal_cache_update (signo); |
d4f3574e SS |
8683 | return ret; |
8684 | } | |
8685 | ||
488f131b | 8686 | int |
7bda5e4a | 8687 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8688 | { |
8689 | int ret = signal_program[signo]; | |
abbb1732 | 8690 | |
d4f3574e | 8691 | signal_program[signo] = state; |
2455069d | 8692 | signal_cache_update (signo); |
d4f3574e SS |
8693 | return ret; |
8694 | } | |
8695 | ||
ab04a2af TT |
8696 | /* Update the global 'signal_catch' from INFO and notify the |
8697 | target. */ | |
8698 | ||
8699 | void | |
8700 | signal_catch_update (const unsigned int *info) | |
8701 | { | |
8702 | int i; | |
8703 | ||
8704 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8705 | signal_catch[i] = info[i] > 0; | |
8706 | signal_cache_update (-1); | |
adc6a863 | 8707 | target_pass_signals (signal_pass); |
ab04a2af TT |
8708 | } |
8709 | ||
c906108c | 8710 | static void |
96baa820 | 8711 | sig_print_header (void) |
c906108c | 8712 | { |
3e43a32a MS |
8713 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8714 | "to program\tDescription\n")); | |
c906108c SS |
8715 | } |
8716 | ||
8717 | static void | |
2ea28649 | 8718 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8719 | { |
2ea28649 | 8720 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8721 | int name_padding = 13 - strlen (name); |
96baa820 | 8722 | |
c906108c SS |
8723 | if (name_padding <= 0) |
8724 | name_padding = 0; | |
8725 | ||
8726 | printf_filtered ("%s", name); | |
488f131b | 8727 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8728 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8729 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8730 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8731 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8732 | } |
8733 | ||
8734 | /* Specify how various signals in the inferior should be handled. */ | |
8735 | ||
8736 | static void | |
0b39b52e | 8737 | handle_command (const char *args, int from_tty) |
c906108c | 8738 | { |
c906108c | 8739 | int digits, wordlen; |
b926417a | 8740 | int sigfirst, siglast; |
2ea28649 | 8741 | enum gdb_signal oursig; |
c906108c | 8742 | int allsigs; |
c906108c SS |
8743 | |
8744 | if (args == NULL) | |
8745 | { | |
e2e0b3e5 | 8746 | error_no_arg (_("signal to handle")); |
c906108c SS |
8747 | } |
8748 | ||
1777feb0 | 8749 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8750 | |
adc6a863 PA |
8751 | const size_t nsigs = GDB_SIGNAL_LAST; |
8752 | unsigned char sigs[nsigs] {}; | |
c906108c | 8753 | |
1777feb0 | 8754 | /* Break the command line up into args. */ |
c906108c | 8755 | |
773a1edc | 8756 | gdb_argv built_argv (args); |
c906108c SS |
8757 | |
8758 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8759 | actions. Signal numbers and signal names may be interspersed with | |
8760 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8761 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8762 | |
773a1edc | 8763 | for (char *arg : built_argv) |
c906108c | 8764 | { |
773a1edc TT |
8765 | wordlen = strlen (arg); |
8766 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8767 | {; |
8768 | } | |
8769 | allsigs = 0; | |
8770 | sigfirst = siglast = -1; | |
8771 | ||
773a1edc | 8772 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8773 | { |
8774 | /* Apply action to all signals except those used by the | |
1777feb0 | 8775 | debugger. Silently skip those. */ |
c906108c SS |
8776 | allsigs = 1; |
8777 | sigfirst = 0; | |
8778 | siglast = nsigs - 1; | |
8779 | } | |
773a1edc | 8780 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8781 | { |
8782 | SET_SIGS (nsigs, sigs, signal_stop); | |
8783 | SET_SIGS (nsigs, sigs, signal_print); | |
8784 | } | |
773a1edc | 8785 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8786 | { |
8787 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8788 | } | |
773a1edc | 8789 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8790 | { |
8791 | SET_SIGS (nsigs, sigs, signal_print); | |
8792 | } | |
773a1edc | 8793 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8794 | { |
8795 | SET_SIGS (nsigs, sigs, signal_program); | |
8796 | } | |
773a1edc | 8797 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8798 | { |
8799 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8800 | } | |
773a1edc | 8801 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8802 | { |
8803 | SET_SIGS (nsigs, sigs, signal_program); | |
8804 | } | |
773a1edc | 8805 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8806 | { |
8807 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8808 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8809 | } | |
773a1edc | 8810 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8811 | { |
8812 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8813 | } | |
8814 | else if (digits > 0) | |
8815 | { | |
8816 | /* It is numeric. The numeric signal refers to our own | |
8817 | internal signal numbering from target.h, not to host/target | |
8818 | signal number. This is a feature; users really should be | |
8819 | using symbolic names anyway, and the common ones like | |
8820 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8821 | ||
8822 | sigfirst = siglast = (int) | |
773a1edc TT |
8823 | gdb_signal_from_command (atoi (arg)); |
8824 | if (arg[digits] == '-') | |
c906108c SS |
8825 | { |
8826 | siglast = (int) | |
773a1edc | 8827 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8828 | } |
8829 | if (sigfirst > siglast) | |
8830 | { | |
1777feb0 | 8831 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8832 | std::swap (sigfirst, siglast); |
c906108c SS |
8833 | } |
8834 | } | |
8835 | else | |
8836 | { | |
773a1edc | 8837 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8838 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8839 | { |
8840 | sigfirst = siglast = (int) oursig; | |
8841 | } | |
8842 | else | |
8843 | { | |
8844 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8845 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8846 | } |
8847 | } | |
8848 | ||
8849 | /* If any signal numbers or symbol names were found, set flags for | |
dda83cd7 | 8850 | which signals to apply actions to. */ |
c906108c | 8851 | |
b926417a | 8852 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8853 | { |
2ea28649 | 8854 | switch ((enum gdb_signal) signum) |
c906108c | 8855 | { |
a493e3e2 PA |
8856 | case GDB_SIGNAL_TRAP: |
8857 | case GDB_SIGNAL_INT: | |
c906108c SS |
8858 | if (!allsigs && !sigs[signum]) |
8859 | { | |
9e2f0ad4 | 8860 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8861 | Are you sure you want to change it? "), |
2ea28649 | 8862 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8863 | { |
8864 | sigs[signum] = 1; | |
8865 | } | |
8866 | else | |
c119e040 | 8867 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8868 | } |
8869 | break; | |
a493e3e2 PA |
8870 | case GDB_SIGNAL_0: |
8871 | case GDB_SIGNAL_DEFAULT: | |
8872 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8873 | /* Make sure that "all" doesn't print these. */ |
8874 | break; | |
8875 | default: | |
8876 | sigs[signum] = 1; | |
8877 | break; | |
8878 | } | |
8879 | } | |
c906108c SS |
8880 | } |
8881 | ||
b926417a | 8882 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8883 | if (sigs[signum]) |
8884 | { | |
2455069d | 8885 | signal_cache_update (-1); |
adc6a863 PA |
8886 | target_pass_signals (signal_pass); |
8887 | target_program_signals (signal_program); | |
c906108c | 8888 | |
3a031f65 PA |
8889 | if (from_tty) |
8890 | { | |
8891 | /* Show the results. */ | |
8892 | sig_print_header (); | |
8893 | for (; signum < nsigs; signum++) | |
8894 | if (sigs[signum]) | |
aead7601 | 8895 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8896 | } |
8897 | ||
8898 | break; | |
8899 | } | |
c906108c SS |
8900 | } |
8901 | ||
de0bea00 MF |
8902 | /* Complete the "handle" command. */ |
8903 | ||
eb3ff9a5 | 8904 | static void |
de0bea00 | 8905 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8906 | completion_tracker &tracker, |
6f937416 | 8907 | const char *text, const char *word) |
de0bea00 | 8908 | { |
de0bea00 MF |
8909 | static const char * const keywords[] = |
8910 | { | |
8911 | "all", | |
8912 | "stop", | |
8913 | "ignore", | |
8914 | "print", | |
8915 | "pass", | |
8916 | "nostop", | |
8917 | "noignore", | |
8918 | "noprint", | |
8919 | "nopass", | |
8920 | NULL, | |
8921 | }; | |
8922 | ||
eb3ff9a5 PA |
8923 | signal_completer (ignore, tracker, text, word); |
8924 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8925 | } |
8926 | ||
2ea28649 PA |
8927 | enum gdb_signal |
8928 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8929 | { |
8930 | if (num >= 1 && num <= 15) | |
2ea28649 | 8931 | return (enum gdb_signal) num; |
ed01b82c PA |
8932 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8933 | Use \"info signals\" for a list of symbolic signals.")); | |
8934 | } | |
8935 | ||
c906108c SS |
8936 | /* Print current contents of the tables set by the handle command. |
8937 | It is possible we should just be printing signals actually used | |
8938 | by the current target (but for things to work right when switching | |
8939 | targets, all signals should be in the signal tables). */ | |
8940 | ||
8941 | static void | |
1d12d88f | 8942 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8943 | { |
2ea28649 | 8944 | enum gdb_signal oursig; |
abbb1732 | 8945 | |
c906108c SS |
8946 | sig_print_header (); |
8947 | ||
8948 | if (signum_exp) | |
8949 | { | |
8950 | /* First see if this is a symbol name. */ | |
2ea28649 | 8951 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8952 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8953 | { |
8954 | /* No, try numeric. */ | |
8955 | oursig = | |
2ea28649 | 8956 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8957 | } |
8958 | sig_print_info (oursig); | |
8959 | return; | |
8960 | } | |
8961 | ||
8962 | printf_filtered ("\n"); | |
8963 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8964 | for (oursig = GDB_SIGNAL_FIRST; |
8965 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8966 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8967 | { |
8968 | QUIT; | |
8969 | ||
a493e3e2 PA |
8970 | if (oursig != GDB_SIGNAL_UNKNOWN |
8971 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8972 | sig_print_info (oursig); |
8973 | } | |
8974 | ||
3e43a32a MS |
8975 | printf_filtered (_("\nUse the \"handle\" command " |
8976 | "to change these tables.\n")); | |
c906108c | 8977 | } |
4aa995e1 PA |
8978 | |
8979 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8980 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8981 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8982 | also dependent on which thread you have selected. |
8983 | ||
8984 | 1. making $_siginfo be an internalvar that creates a new value on | |
8985 | access. | |
8986 | ||
8987 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8988 | ||
8989 | /* This function implements the lval_computed support for reading a | |
8990 | $_siginfo value. */ | |
8991 | ||
8992 | static void | |
8993 | siginfo_value_read (struct value *v) | |
8994 | { | |
8995 | LONGEST transferred; | |
8996 | ||
a911d87a PA |
8997 | /* If we can access registers, so can we access $_siginfo. Likewise |
8998 | vice versa. */ | |
8999 | validate_registers_access (); | |
c709acd1 | 9000 | |
4aa995e1 | 9001 | transferred = |
328d42d8 SM |
9002 | target_read (current_inferior ()->top_target (), |
9003 | TARGET_OBJECT_SIGNAL_INFO, | |
4aa995e1 PA |
9004 | NULL, |
9005 | value_contents_all_raw (v), | |
9006 | value_offset (v), | |
9007 | TYPE_LENGTH (value_type (v))); | |
9008 | ||
9009 | if (transferred != TYPE_LENGTH (value_type (v))) | |
9010 | error (_("Unable to read siginfo")); | |
9011 | } | |
9012 | ||
9013 | /* This function implements the lval_computed support for writing a | |
9014 | $_siginfo value. */ | |
9015 | ||
9016 | static void | |
9017 | siginfo_value_write (struct value *v, struct value *fromval) | |
9018 | { | |
9019 | LONGEST transferred; | |
9020 | ||
a911d87a PA |
9021 | /* If we can access registers, so can we access $_siginfo. Likewise |
9022 | vice versa. */ | |
9023 | validate_registers_access (); | |
c709acd1 | 9024 | |
328d42d8 | 9025 | transferred = target_write (current_inferior ()->top_target (), |
4aa995e1 PA |
9026 | TARGET_OBJECT_SIGNAL_INFO, |
9027 | NULL, | |
9028 | value_contents_all_raw (fromval), | |
9029 | value_offset (v), | |
9030 | TYPE_LENGTH (value_type (fromval))); | |
9031 | ||
9032 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
9033 | error (_("Unable to write siginfo")); | |
9034 | } | |
9035 | ||
c8f2448a | 9036 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
9037 | { |
9038 | siginfo_value_read, | |
9039 | siginfo_value_write | |
9040 | }; | |
9041 | ||
9042 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
9043 | the current thread using architecture GDBARCH. Return a void value |
9044 | if there's no object available. */ | |
4aa995e1 | 9045 | |
2c0b251b | 9046 | static struct value * |
22d2b532 SDJ |
9047 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
9048 | void *ignore) | |
4aa995e1 | 9049 | { |
841de120 | 9050 | if (target_has_stack () |
d7e15655 | 9051 | && inferior_ptid != null_ptid |
78267919 | 9052 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 9053 | { |
78267919 | 9054 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 9055 | |
78267919 | 9056 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
9057 | } |
9058 | ||
78267919 | 9059 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
9060 | } |
9061 | ||
c906108c | 9062 | \f |
16c381f0 JK |
9063 | /* infcall_suspend_state contains state about the program itself like its |
9064 | registers and any signal it received when it last stopped. | |
9065 | This state must be restored regardless of how the inferior function call | |
9066 | ends (either successfully, or after it hits a breakpoint or signal) | |
9067 | if the program is to properly continue where it left off. */ | |
9068 | ||
6bf78e29 | 9069 | class infcall_suspend_state |
7a292a7a | 9070 | { |
6bf78e29 AB |
9071 | public: |
9072 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
9073 | once the inferior function call has finished. */ | |
9074 | infcall_suspend_state (struct gdbarch *gdbarch, | |
dda83cd7 SM |
9075 | const struct thread_info *tp, |
9076 | struct regcache *regcache) | |
1edb66d8 | 9077 | : m_registers (new readonly_detached_regcache (*regcache)) |
6bf78e29 | 9078 | { |
1edb66d8 SM |
9079 | tp->save_suspend_to (m_thread_suspend); |
9080 | ||
6bf78e29 AB |
9081 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; |
9082 | ||
9083 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
9084 | { | |
dda83cd7 SM |
9085 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
9086 | size_t len = TYPE_LENGTH (type); | |
6bf78e29 | 9087 | |
dda83cd7 | 9088 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); |
6bf78e29 | 9089 | |
328d42d8 SM |
9090 | if (target_read (current_inferior ()->top_target (), |
9091 | TARGET_OBJECT_SIGNAL_INFO, NULL, | |
dda83cd7 SM |
9092 | siginfo_data.get (), 0, len) != len) |
9093 | { | |
9094 | /* Errors ignored. */ | |
9095 | siginfo_data.reset (nullptr); | |
9096 | } | |
6bf78e29 AB |
9097 | } |
9098 | ||
9099 | if (siginfo_data) | |
9100 | { | |
dda83cd7 SM |
9101 | m_siginfo_gdbarch = gdbarch; |
9102 | m_siginfo_data = std::move (siginfo_data); | |
6bf78e29 AB |
9103 | } |
9104 | } | |
9105 | ||
9106 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 9107 | |
6bf78e29 AB |
9108 | readonly_detached_regcache *registers () const |
9109 | { | |
9110 | return m_registers.get (); | |
9111 | } | |
9112 | ||
9113 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
9114 | ||
9115 | void restore (struct gdbarch *gdbarch, | |
dda83cd7 SM |
9116 | struct thread_info *tp, |
9117 | struct regcache *regcache) const | |
6bf78e29 | 9118 | { |
1edb66d8 | 9119 | tp->restore_suspend_from (m_thread_suspend); |
6bf78e29 AB |
9120 | |
9121 | if (m_siginfo_gdbarch == gdbarch) | |
9122 | { | |
dda83cd7 | 9123 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
6bf78e29 | 9124 | |
dda83cd7 | 9125 | /* Errors ignored. */ |
328d42d8 SM |
9126 | target_write (current_inferior ()->top_target (), |
9127 | TARGET_OBJECT_SIGNAL_INFO, NULL, | |
dda83cd7 | 9128 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); |
6bf78e29 AB |
9129 | } |
9130 | ||
9131 | /* The inferior can be gone if the user types "print exit(0)" | |
9132 | (and perhaps other times). */ | |
55f6301a | 9133 | if (target_has_execution ()) |
6bf78e29 AB |
9134 | /* NB: The register write goes through to the target. */ |
9135 | regcache->restore (registers ()); | |
9136 | } | |
9137 | ||
9138 | private: | |
9139 | /* How the current thread stopped before the inferior function call was | |
9140 | executed. */ | |
9141 | struct thread_suspend_state m_thread_suspend; | |
9142 | ||
9143 | /* The registers before the inferior function call was executed. */ | |
9144 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 9145 | |
35515841 | 9146 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 9147 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
9148 | |
9149 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
9150 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
9151 | content would be invalid. */ | |
6bf78e29 | 9152 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
9153 | }; |
9154 | ||
cb524840 TT |
9155 | infcall_suspend_state_up |
9156 | save_infcall_suspend_state () | |
b89667eb | 9157 | { |
b89667eb | 9158 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 9159 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9160 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 9161 | |
6bf78e29 AB |
9162 | infcall_suspend_state_up inf_state |
9163 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 9164 | |
6bf78e29 AB |
9165 | /* Having saved the current state, adjust the thread state, discarding |
9166 | any stop signal information. The stop signal is not useful when | |
9167 | starting an inferior function call, and run_inferior_call will not use | |
9168 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
1edb66d8 | 9169 | tp->set_stop_signal (GDB_SIGNAL_0); |
35515841 | 9170 | |
b89667eb DE |
9171 | return inf_state; |
9172 | } | |
9173 | ||
9174 | /* Restore inferior session state to INF_STATE. */ | |
9175 | ||
9176 | void | |
16c381f0 | 9177 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
9178 | { |
9179 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 9180 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9181 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 9182 | |
6bf78e29 | 9183 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 9184 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
9185 | } |
9186 | ||
b89667eb | 9187 | void |
16c381f0 | 9188 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 9189 | { |
dd848631 | 9190 | delete inf_state; |
b89667eb DE |
9191 | } |
9192 | ||
daf6667d | 9193 | readonly_detached_regcache * |
16c381f0 | 9194 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 9195 | { |
6bf78e29 | 9196 | return inf_state->registers (); |
b89667eb DE |
9197 | } |
9198 | ||
16c381f0 JK |
9199 | /* infcall_control_state contains state regarding gdb's control of the |
9200 | inferior itself like stepping control. It also contains session state like | |
9201 | the user's currently selected frame. */ | |
b89667eb | 9202 | |
16c381f0 | 9203 | struct infcall_control_state |
b89667eb | 9204 | { |
16c381f0 JK |
9205 | struct thread_control_state thread_control; |
9206 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
9207 | |
9208 | /* Other fields: */ | |
ee841dd8 TT |
9209 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
9210 | int stopped_by_random_signal = 0; | |
7a292a7a | 9211 | |
79952e69 PA |
9212 | /* ID and level of the selected frame when the inferior function |
9213 | call was made. */ | |
ee841dd8 | 9214 | struct frame_id selected_frame_id {}; |
79952e69 | 9215 | int selected_frame_level = -1; |
7a292a7a SS |
9216 | }; |
9217 | ||
c906108c | 9218 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9219 | connection. */ |
c906108c | 9220 | |
cb524840 TT |
9221 | infcall_control_state_up |
9222 | save_infcall_control_state () | |
c906108c | 9223 | { |
cb524840 | 9224 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9225 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9226 | struct inferior *inf = current_inferior (); |
7a292a7a | 9227 | |
16c381f0 JK |
9228 | inf_status->thread_control = tp->control; |
9229 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9230 | |
8358c15c | 9231 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9232 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9233 | |
16c381f0 JK |
9234 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9235 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9236 | hand them back the original chain when restore_infcall_control_state is | |
9237 | called. */ | |
9238 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9239 | |
9240 | /* Other fields: */ | |
9241 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9242 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9243 | |
79952e69 PA |
9244 | save_selected_frame (&inf_status->selected_frame_id, |
9245 | &inf_status->selected_frame_level); | |
b89667eb | 9246 | |
7a292a7a | 9247 | return inf_status; |
c906108c SS |
9248 | } |
9249 | ||
b89667eb DE |
9250 | /* Restore inferior session state to INF_STATUS. */ |
9251 | ||
c906108c | 9252 | void |
16c381f0 | 9253 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9254 | { |
4e1c45ea | 9255 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9256 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9257 | |
8358c15c JK |
9258 | if (tp->control.step_resume_breakpoint) |
9259 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9260 | ||
5b79abe7 TT |
9261 | if (tp->control.exception_resume_breakpoint) |
9262 | tp->control.exception_resume_breakpoint->disposition | |
9263 | = disp_del_at_next_stop; | |
9264 | ||
d82142e2 | 9265 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9266 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9267 | |
16c381f0 JK |
9268 | tp->control = inf_status->thread_control; |
9269 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9270 | |
9271 | /* Other fields: */ | |
9272 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9273 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9274 | |
841de120 | 9275 | if (target_has_stack ()) |
c906108c | 9276 | { |
79952e69 PA |
9277 | restore_selected_frame (inf_status->selected_frame_id, |
9278 | inf_status->selected_frame_level); | |
c906108c | 9279 | } |
c906108c | 9280 | |
ee841dd8 | 9281 | delete inf_status; |
7a292a7a | 9282 | } |
c906108c SS |
9283 | |
9284 | void | |
16c381f0 | 9285 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9286 | { |
8358c15c JK |
9287 | if (inf_status->thread_control.step_resume_breakpoint) |
9288 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9289 | = disp_del_at_next_stop; | |
9290 | ||
5b79abe7 TT |
9291 | if (inf_status->thread_control.exception_resume_breakpoint) |
9292 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9293 | = disp_del_at_next_stop; | |
9294 | ||
1777feb0 | 9295 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9296 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9297 | |
ee841dd8 | 9298 | delete inf_status; |
7a292a7a | 9299 | } |
b89667eb | 9300 | \f |
7f89fd65 | 9301 | /* See infrun.h. */ |
0c557179 SDJ |
9302 | |
9303 | void | |
9304 | clear_exit_convenience_vars (void) | |
9305 | { | |
9306 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9307 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9308 | } | |
c5aa993b | 9309 | \f |
488f131b | 9310 | |
b2175913 MS |
9311 | /* User interface for reverse debugging: |
9312 | Set exec-direction / show exec-direction commands | |
9313 | (returns error unless target implements to_set_exec_direction method). */ | |
9314 | ||
170742de | 9315 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9316 | static const char exec_forward[] = "forward"; |
9317 | static const char exec_reverse[] = "reverse"; | |
9318 | static const char *exec_direction = exec_forward; | |
40478521 | 9319 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9320 | exec_forward, |
9321 | exec_reverse, | |
9322 | NULL | |
9323 | }; | |
9324 | ||
9325 | static void | |
eb4c3f4a | 9326 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9327 | struct cmd_list_element *cmd) |
9328 | { | |
05374cfd | 9329 | if (target_can_execute_reverse ()) |
b2175913 MS |
9330 | { |
9331 | if (!strcmp (exec_direction, exec_forward)) | |
9332 | execution_direction = EXEC_FORWARD; | |
9333 | else if (!strcmp (exec_direction, exec_reverse)) | |
9334 | execution_direction = EXEC_REVERSE; | |
9335 | } | |
8bbed405 MS |
9336 | else |
9337 | { | |
9338 | exec_direction = exec_forward; | |
9339 | error (_("Target does not support this operation.")); | |
9340 | } | |
b2175913 MS |
9341 | } |
9342 | ||
9343 | static void | |
9344 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9345 | struct cmd_list_element *cmd, const char *value) | |
9346 | { | |
9347 | switch (execution_direction) { | |
9348 | case EXEC_FORWARD: | |
9349 | fprintf_filtered (out, _("Forward.\n")); | |
9350 | break; | |
9351 | case EXEC_REVERSE: | |
9352 | fprintf_filtered (out, _("Reverse.\n")); | |
9353 | break; | |
b2175913 | 9354 | default: |
d8b34453 PA |
9355 | internal_error (__FILE__, __LINE__, |
9356 | _("bogus execution_direction value: %d"), | |
9357 | (int) execution_direction); | |
b2175913 MS |
9358 | } |
9359 | } | |
9360 | ||
d4db2f36 PA |
9361 | static void |
9362 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9363 | struct cmd_list_element *c, const char *value) | |
9364 | { | |
3e43a32a MS |
9365 | fprintf_filtered (file, _("Resuming the execution of threads " |
9366 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9367 | } |
ad52ddc6 | 9368 | |
22d2b532 SDJ |
9369 | /* Implementation of `siginfo' variable. */ |
9370 | ||
9371 | static const struct internalvar_funcs siginfo_funcs = | |
9372 | { | |
9373 | siginfo_make_value, | |
9374 | NULL, | |
9375 | NULL | |
9376 | }; | |
9377 | ||
372316f1 PA |
9378 | /* Callback for infrun's target events source. This is marked when a |
9379 | thread has a pending status to process. */ | |
9380 | ||
9381 | static void | |
9382 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9383 | { | |
6b36ddeb | 9384 | clear_async_event_handler (infrun_async_inferior_event_token); |
b1a35af2 | 9385 | inferior_event_handler (INF_REG_EVENT); |
372316f1 PA |
9386 | } |
9387 | ||
8087c3fa | 9388 | #if GDB_SELF_TEST |
b161a60d SM |
9389 | namespace selftests |
9390 | { | |
9391 | ||
9392 | /* Verify that when two threads with the same ptid exist (from two different | |
9393 | targets) and one of them changes ptid, we only update inferior_ptid if | |
9394 | it is appropriate. */ | |
9395 | ||
9396 | static void | |
9397 | infrun_thread_ptid_changed () | |
9398 | { | |
9399 | gdbarch *arch = current_inferior ()->gdbarch; | |
9400 | ||
9401 | /* The thread which inferior_ptid represents changes ptid. */ | |
9402 | { | |
9403 | scoped_restore_current_pspace_and_thread restore; | |
9404 | ||
9405 | scoped_mock_context<test_target_ops> target1 (arch); | |
9406 | scoped_mock_context<test_target_ops> target2 (arch); | |
b161a60d SM |
9407 | |
9408 | ptid_t old_ptid (111, 222); | |
9409 | ptid_t new_ptid (111, 333); | |
9410 | ||
9411 | target1.mock_inferior.pid = old_ptid.pid (); | |
9412 | target1.mock_thread.ptid = old_ptid; | |
922cc93d SM |
9413 | target1.mock_inferior.ptid_thread_map.clear (); |
9414 | target1.mock_inferior.ptid_thread_map[old_ptid] = &target1.mock_thread; | |
9415 | ||
b161a60d SM |
9416 | target2.mock_inferior.pid = old_ptid.pid (); |
9417 | target2.mock_thread.ptid = old_ptid; | |
922cc93d SM |
9418 | target2.mock_inferior.ptid_thread_map.clear (); |
9419 | target2.mock_inferior.ptid_thread_map[old_ptid] = &target2.mock_thread; | |
b161a60d SM |
9420 | |
9421 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
9422 | set_current_inferior (&target1.mock_inferior); | |
9423 | ||
9424 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9425 | ||
9426 | gdb_assert (inferior_ptid == new_ptid); | |
9427 | } | |
9428 | ||
9429 | /* A thread with the same ptid as inferior_ptid, but from another target, | |
9430 | changes ptid. */ | |
9431 | { | |
9432 | scoped_restore_current_pspace_and_thread restore; | |
9433 | ||
9434 | scoped_mock_context<test_target_ops> target1 (arch); | |
9435 | scoped_mock_context<test_target_ops> target2 (arch); | |
b161a60d SM |
9436 | |
9437 | ptid_t old_ptid (111, 222); | |
9438 | ptid_t new_ptid (111, 333); | |
9439 | ||
9440 | target1.mock_inferior.pid = old_ptid.pid (); | |
9441 | target1.mock_thread.ptid = old_ptid; | |
922cc93d SM |
9442 | target1.mock_inferior.ptid_thread_map.clear (); |
9443 | target1.mock_inferior.ptid_thread_map[old_ptid] = &target1.mock_thread; | |
9444 | ||
b161a60d SM |
9445 | target2.mock_inferior.pid = old_ptid.pid (); |
9446 | target2.mock_thread.ptid = old_ptid; | |
922cc93d SM |
9447 | target2.mock_inferior.ptid_thread_map.clear (); |
9448 | target2.mock_inferior.ptid_thread_map[old_ptid] = &target2.mock_thread; | |
b161a60d SM |
9449 | |
9450 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
9451 | set_current_inferior (&target2.mock_inferior); | |
9452 | ||
9453 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9454 | ||
9455 | gdb_assert (inferior_ptid == old_ptid); | |
9456 | } | |
9457 | } | |
9458 | ||
9459 | } /* namespace selftests */ | |
9460 | ||
8087c3fa JB |
9461 | #endif /* GDB_SELF_TEST */ |
9462 | ||
6c265988 | 9463 | void _initialize_infrun (); |
c906108c | 9464 | void |
6c265988 | 9465 | _initialize_infrun () |
c906108c | 9466 | { |
de0bea00 | 9467 | struct cmd_list_element *c; |
c906108c | 9468 | |
372316f1 PA |
9469 | /* Register extra event sources in the event loop. */ |
9470 | infrun_async_inferior_event_token | |
db20ebdf SM |
9471 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL, |
9472 | "infrun"); | |
372316f1 | 9473 | |
e0f25bd9 SM |
9474 | cmd_list_element *info_signals_cmd |
9475 | = add_info ("signals", info_signals_command, _("\ | |
1bedd215 AC |
9476 | What debugger does when program gets various signals.\n\ |
9477 | Specify a signal as argument to print info on that signal only.")); | |
e0f25bd9 | 9478 | add_info_alias ("handle", info_signals_cmd, 0); |
c906108c | 9479 | |
de0bea00 | 9480 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9481 | Specify how to handle signals.\n\ |
486c7739 | 9482 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9483 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9484 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9485 | will be displayed instead.\n\ |
9486 | \n\ | |
c906108c SS |
9487 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9488 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9489 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9490 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9491 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9492 | \n\ |
1bedd215 | 9493 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9494 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9495 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9496 | Print means print a message if this signal happens.\n\ | |
9497 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9498 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9499 | Pass and Stop may be combined.\n\ |
9500 | \n\ | |
9501 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9502 | may be interspersed with actions, with the actions being performed for\n\ | |
9503 | all signals cumulatively specified.")); | |
de0bea00 | 9504 | set_cmd_completer (c, handle_completer); |
486c7739 | 9505 | |
c906108c | 9506 | if (!dbx_commands) |
1a966eab AC |
9507 | stop_command = add_cmd ("stop", class_obscure, |
9508 | not_just_help_class_command, _("\ | |
9509 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9510 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9511 | of the program stops."), &cmdlist); |
c906108c | 9512 | |
94ba44a6 SM |
9513 | add_setshow_boolean_cmd |
9514 | ("infrun", class_maintenance, &debug_infrun, | |
9515 | _("Set inferior debugging."), | |
9516 | _("Show inferior debugging."), | |
9517 | _("When non-zero, inferior specific debugging is enabled."), | |
9518 | NULL, show_debug_infrun, &setdebuglist, &showdebuglist); | |
527159b7 | 9519 | |
ad52ddc6 PA |
9520 | add_setshow_boolean_cmd ("non-stop", no_class, |
9521 | &non_stop_1, _("\ | |
9522 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9523 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9524 | When debugging a multi-threaded program and this setting is\n\ | |
9525 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9526 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9527 | all other threads in the program while you interact with the thread of\n\ | |
9528 | interest. When you continue or step a thread, you can allow the other\n\ | |
9529 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9530 | thread's state, all threads stop.\n\ | |
9531 | \n\ | |
9532 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9533 | to run freely. You'll be able to step each thread independently,\n\ | |
9534 | leave it stopped or free to run as needed."), | |
9535 | set_non_stop, | |
9536 | show_non_stop, | |
9537 | &setlist, | |
9538 | &showlist); | |
9539 | ||
adc6a863 | 9540 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9541 | { |
9542 | signal_stop[i] = 1; | |
9543 | signal_print[i] = 1; | |
9544 | signal_program[i] = 1; | |
ab04a2af | 9545 | signal_catch[i] = 0; |
c906108c SS |
9546 | } |
9547 | ||
4d9d9d04 PA |
9548 | /* Signals caused by debugger's own actions should not be given to |
9549 | the program afterwards. | |
9550 | ||
9551 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9552 | explicitly specifies that it should be delivered to the target | |
9553 | program. Typically, that would occur when a user is debugging a | |
9554 | target monitor on a simulator: the target monitor sets a | |
9555 | breakpoint; the simulator encounters this breakpoint and halts | |
9556 | the simulation handing control to GDB; GDB, noting that the stop | |
9557 | address doesn't map to any known breakpoint, returns control back | |
9558 | to the simulator; the simulator then delivers the hardware | |
9559 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9560 | debugged. */ | |
a493e3e2 PA |
9561 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9562 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9563 | |
9564 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9565 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9566 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9567 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9568 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9569 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9570 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9571 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9572 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9573 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9574 | signal_print[GDB_SIGNAL_IO] = 0; | |
9575 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9576 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9577 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9578 | signal_print[GDB_SIGNAL_URG] = 0; | |
9579 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9580 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9581 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9582 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9583 | |
cd0fc7c3 SS |
9584 | /* These signals are used internally by user-level thread |
9585 | implementations. (See signal(5) on Solaris.) Like the above | |
9586 | signals, a healthy program receives and handles them as part of | |
9587 | its normal operation. */ | |
a493e3e2 PA |
9588 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9589 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9590 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9591 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9592 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9593 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9594 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9595 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9596 | |
2455069d UW |
9597 | /* Update cached state. */ |
9598 | signal_cache_update (-1); | |
9599 | ||
85c07804 AC |
9600 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9601 | &stop_on_solib_events, _("\ | |
9602 | Set stopping for shared library events."), _("\ | |
9603 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9604 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9605 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9606 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9607 | set_stop_on_solib_events, |
920d2a44 | 9608 | show_stop_on_solib_events, |
85c07804 | 9609 | &setlist, &showlist); |
c906108c | 9610 | |
7ab04401 AC |
9611 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9612 | follow_fork_mode_kind_names, | |
9613 | &follow_fork_mode_string, _("\ | |
9614 | Set debugger response to a program call of fork or vfork."), _("\ | |
9615 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9616 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9617 | parent - the original process is debugged after a fork\n\ | |
9618 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9619 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9620 | By default, the debugger will follow the parent process."), |
9621 | NULL, | |
920d2a44 | 9622 | show_follow_fork_mode_string, |
7ab04401 AC |
9623 | &setlist, &showlist); |
9624 | ||
6c95b8df PA |
9625 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9626 | follow_exec_mode_names, | |
9627 | &follow_exec_mode_string, _("\ | |
9628 | Set debugger response to a program call of exec."), _("\ | |
9629 | Show debugger response to a program call of exec."), _("\ | |
9630 | An exec call replaces the program image of a process.\n\ | |
9631 | \n\ | |
9632 | follow-exec-mode can be:\n\ | |
9633 | \n\ | |
cce7e648 | 9634 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9635 | to this new inferior. The program the process was running before\n\ |
9636 | the exec call can be restarted afterwards by restarting the original\n\ | |
9637 | inferior.\n\ | |
9638 | \n\ | |
9639 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9640 | The new executable image replaces the previous executable loaded in\n\ | |
9641 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9642 | the executable the process was running after the exec call.\n\ | |
9643 | \n\ | |
9644 | By default, the debugger will use the same inferior."), | |
9645 | NULL, | |
9646 | show_follow_exec_mode_string, | |
9647 | &setlist, &showlist); | |
9648 | ||
7ab04401 AC |
9649 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9650 | scheduler_enums, &scheduler_mode, _("\ | |
9651 | Set mode for locking scheduler during execution."), _("\ | |
9652 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9653 | off == no locking (threads may preempt at any time)\n\ |
9654 | on == full locking (no thread except the current thread may run)\n\ | |
dda83cd7 | 9655 | This applies to both normal execution and replay mode.\n\ |
f2665db5 | 9656 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ |
dda83cd7 SM |
9657 | In this mode, other threads may run during other commands.\n\ |
9658 | This applies to both normal execution and replay mode.\n\ | |
f2665db5 | 9659 | replay == scheduler locked in replay mode and unlocked during normal execution."), |
7ab04401 | 9660 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9661 | show_scheduler_mode, |
7ab04401 | 9662 | &setlist, &showlist); |
5fbbeb29 | 9663 | |
d4db2f36 PA |
9664 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9665 | Set mode for resuming threads of all processes."), _("\ | |
9666 | Show mode for resuming threads of all processes."), _("\ | |
9667 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9668 | threads of all processes. When off (which is the default), execution\n\ | |
9669 | commands only resume the threads of the current process. The set of\n\ | |
9670 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9671 | mode (see help set scheduler-locking)."), | |
9672 | NULL, | |
9673 | show_schedule_multiple, | |
9674 | &setlist, &showlist); | |
9675 | ||
5bf193a2 AC |
9676 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9677 | Set mode of the step operation."), _("\ | |
9678 | Show mode of the step operation."), _("\ | |
9679 | When set, doing a step over a function without debug line information\n\ | |
9680 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9681 | function is skipped and the step command stops at a different source line."), | |
9682 | NULL, | |
920d2a44 | 9683 | show_step_stop_if_no_debug, |
5bf193a2 | 9684 | &setlist, &showlist); |
ca6724c1 | 9685 | |
72d0e2c5 YQ |
9686 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9687 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9688 | Set debugger's willingness to use displaced stepping."), _("\ |
9689 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9690 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9691 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9692 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9693 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9694 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9695 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9696 | NULL, |
9697 | show_can_use_displaced_stepping, | |
9698 | &setlist, &showlist); | |
237fc4c9 | 9699 | |
b2175913 MS |
9700 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9701 | &exec_direction, _("Set direction of execution.\n\ | |
9702 | Options are 'forward' or 'reverse'."), | |
9703 | _("Show direction of execution (forward/reverse)."), | |
9704 | _("Tells gdb whether to execute forward or backward."), | |
9705 | set_exec_direction_func, show_exec_direction_func, | |
9706 | &setlist, &showlist); | |
9707 | ||
6c95b8df PA |
9708 | /* Set/show detach-on-fork: user-settable mode. */ |
9709 | ||
9710 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9711 | Set whether gdb will detach the child of a fork."), _("\ | |
9712 | Show whether gdb will detach the child of a fork."), _("\ | |
9713 | Tells gdb whether to detach the child of a fork."), | |
9714 | NULL, NULL, &setlist, &showlist); | |
9715 | ||
03583c20 UW |
9716 | /* Set/show disable address space randomization mode. */ |
9717 | ||
9718 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9719 | &disable_randomization, _("\ | |
9720 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9721 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9722 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9723 | address space is disabled. Standalone programs run with the randomization\n\ | |
9724 | enabled by default on some platforms."), | |
9725 | &set_disable_randomization, | |
9726 | &show_disable_randomization, | |
9727 | &setlist, &showlist); | |
9728 | ||
ca6724c1 | 9729 | /* ptid initializations */ |
ca6724c1 KB |
9730 | inferior_ptid = null_ptid; |
9731 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9732 | |
c90e7d63 SM |
9733 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed, |
9734 | "infrun"); | |
9735 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested, | |
9736 | "infrun"); | |
9737 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit, "infrun"); | |
9738 | gdb::observers::inferior_exit.attach (infrun_inferior_exit, "infrun"); | |
9739 | gdb::observers::inferior_execd.attach (infrun_inferior_execd, "infrun"); | |
4aa995e1 PA |
9740 | |
9741 | /* Explicitly create without lookup, since that tries to create a | |
9742 | value with a void typed value, and when we get here, gdbarch | |
9743 | isn't initialized yet. At this point, we're quite sure there | |
9744 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9745 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9746 | |
9747 | add_setshow_boolean_cmd ("observer", no_class, | |
9748 | &observer_mode_1, _("\ | |
9749 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9750 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9751 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9752 | affect its execution. Registers and memory may not be changed,\n\ | |
9753 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9754 | or signalled."), | |
9755 | set_observer_mode, | |
9756 | show_observer_mode, | |
9757 | &setlist, | |
9758 | &showlist); | |
b161a60d SM |
9759 | |
9760 | #if GDB_SELF_TEST | |
9761 | selftests::register_test ("infrun_thread_ptid_changed", | |
9762 | selftests::infrun_thread_ptid_changed); | |
9763 | #endif | |
c906108c | 9764 | } |