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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 | |
b811d2c2 | 4 | Copyright (C) 1986-2020 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" | |
45741a9c | 22 | #include "infrun.h" |
c906108c SS |
23 | #include <ctype.h> |
24 | #include "symtab.h" | |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "breakpoint.h" | |
c906108c SS |
28 | #include "gdbcore.h" |
29 | #include "gdbcmd.h" | |
30 | #include "target.h" | |
2f4fcf00 | 31 | #include "target-connection.h" |
c906108c SS |
32 | #include "gdbthread.h" |
33 | #include "annotate.h" | |
1adeb98a | 34 | #include "symfile.h" |
7a292a7a | 35 | #include "top.h" |
2acceee2 | 36 | #include "inf-loop.h" |
4e052eda | 37 | #include "regcache.h" |
fd0407d6 | 38 | #include "value.h" |
76727919 | 39 | #include "observable.h" |
f636b87d | 40 | #include "language.h" |
a77053c2 | 41 | #include "solib.h" |
f17517ea | 42 | #include "main.h" |
186c406b | 43 | #include "block.h" |
034dad6f | 44 | #include "mi/mi-common.h" |
4f8d22e3 | 45 | #include "event-top.h" |
96429cc8 | 46 | #include "record.h" |
d02ed0bb | 47 | #include "record-full.h" |
edb3359d | 48 | #include "inline-frame.h" |
4efc6507 | 49 | #include "jit.h" |
06cd862c | 50 | #include "tracepoint.h" |
1bfeeb0f | 51 | #include "skip.h" |
28106bc2 SDJ |
52 | #include "probe.h" |
53 | #include "objfiles.h" | |
de0bea00 | 54 | #include "completer.h" |
9107fc8d | 55 | #include "target-descriptions.h" |
f15cb84a | 56 | #include "target-dcache.h" |
d83ad864 | 57 | #include "terminal.h" |
ff862be4 | 58 | #include "solist.h" |
400b5eca | 59 | #include "gdbsupport/event-loop.h" |
243a9253 | 60 | #include "thread-fsm.h" |
268a13a5 | 61 | #include "gdbsupport/enum-flags.h" |
5ed8105e | 62 | #include "progspace-and-thread.h" |
268a13a5 | 63 | #include "gdbsupport/gdb_optional.h" |
46a62268 | 64 | #include "arch-utils.h" |
268a13a5 TT |
65 | #include "gdbsupport/scope-exit.h" |
66 | #include "gdbsupport/forward-scope-exit.h" | |
06cc9596 | 67 | #include "gdbsupport/gdb_select.h" |
5b6d1e4f | 68 | #include <unordered_map> |
93b54c8e | 69 | #include "async-event.h" |
c906108c SS |
70 | |
71 | /* Prototypes for local functions */ | |
72 | ||
2ea28649 | 73 | static void sig_print_info (enum gdb_signal); |
c906108c | 74 | |
96baa820 | 75 | static void sig_print_header (void); |
c906108c | 76 | |
d83ad864 DB |
77 | static void follow_inferior_reset_breakpoints (void); |
78 | ||
a289b8f6 JK |
79 | static int currently_stepping (struct thread_info *tp); |
80 | ||
2c03e5be | 81 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
82 | |
83 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
84 | ||
2484c66b UW |
85 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
86 | ||
8550d3b3 YQ |
87 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
88 | ||
aff4e175 AB |
89 | static void resume (gdb_signal sig); |
90 | ||
5b6d1e4f PA |
91 | static void wait_for_inferior (inferior *inf); |
92 | ||
372316f1 PA |
93 | /* Asynchronous signal handler registered as event loop source for |
94 | when we have pending events ready to be passed to the core. */ | |
95 | static struct async_event_handler *infrun_async_inferior_event_token; | |
96 | ||
97 | /* Stores whether infrun_async was previously enabled or disabled. | |
98 | Starts off as -1, indicating "never enabled/disabled". */ | |
99 | static int infrun_is_async = -1; | |
100 | ||
101 | /* See infrun.h. */ | |
102 | ||
103 | void | |
104 | infrun_async (int enable) | |
105 | { | |
106 | if (infrun_is_async != enable) | |
107 | { | |
108 | infrun_is_async = enable; | |
109 | ||
110 | if (debug_infrun) | |
111 | fprintf_unfiltered (gdb_stdlog, | |
112 | "infrun: infrun_async(%d)\n", | |
113 | enable); | |
114 | ||
115 | if (enable) | |
116 | mark_async_event_handler (infrun_async_inferior_event_token); | |
117 | else | |
118 | clear_async_event_handler (infrun_async_inferior_event_token); | |
119 | } | |
120 | } | |
121 | ||
0b333c5e PA |
122 | /* See infrun.h. */ |
123 | ||
124 | void | |
125 | mark_infrun_async_event_handler (void) | |
126 | { | |
127 | mark_async_event_handler (infrun_async_inferior_event_token); | |
128 | } | |
129 | ||
5fbbeb29 CF |
130 | /* When set, stop the 'step' command if we enter a function which has |
131 | no line number information. The normal behavior is that we step | |
132 | over such function. */ | |
491144b5 | 133 | bool step_stop_if_no_debug = false; |
920d2a44 AC |
134 | static void |
135 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
136 | struct cmd_list_element *c, const char *value) | |
137 | { | |
138 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
139 | } | |
5fbbeb29 | 140 | |
b9f437de PA |
141 | /* proceed and normal_stop use this to notify the user when the |
142 | inferior stopped in a different thread than it had been running | |
143 | in. */ | |
96baa820 | 144 | |
39f77062 | 145 | static ptid_t previous_inferior_ptid; |
7a292a7a | 146 | |
07107ca6 LM |
147 | /* If set (default for legacy reasons), when following a fork, GDB |
148 | will detach from one of the fork branches, child or parent. | |
149 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
150 | setting. */ | |
151 | ||
491144b5 | 152 | static bool detach_fork = true; |
6c95b8df | 153 | |
491144b5 | 154 | bool debug_displaced = false; |
237fc4c9 PA |
155 | static void |
156 | show_debug_displaced (struct ui_file *file, int from_tty, | |
157 | struct cmd_list_element *c, const char *value) | |
158 | { | |
159 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
160 | } | |
161 | ||
ccce17b0 | 162 | unsigned int debug_infrun = 0; |
920d2a44 AC |
163 | static void |
164 | show_debug_infrun (struct ui_file *file, int from_tty, | |
165 | struct cmd_list_element *c, const char *value) | |
166 | { | |
167 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
168 | } | |
527159b7 | 169 | |
03583c20 UW |
170 | |
171 | /* Support for disabling address space randomization. */ | |
172 | ||
491144b5 | 173 | bool disable_randomization = true; |
03583c20 UW |
174 | |
175 | static void | |
176 | show_disable_randomization (struct ui_file *file, int from_tty, | |
177 | struct cmd_list_element *c, const char *value) | |
178 | { | |
179 | if (target_supports_disable_randomization ()) | |
180 | fprintf_filtered (file, | |
181 | _("Disabling randomization of debuggee's " | |
182 | "virtual address space is %s.\n"), | |
183 | value); | |
184 | else | |
185 | fputs_filtered (_("Disabling randomization of debuggee's " | |
186 | "virtual address space is unsupported on\n" | |
187 | "this platform.\n"), file); | |
188 | } | |
189 | ||
190 | static void | |
eb4c3f4a | 191 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
192 | struct cmd_list_element *c) |
193 | { | |
194 | if (!target_supports_disable_randomization ()) | |
195 | error (_("Disabling randomization of debuggee's " | |
196 | "virtual address space is unsupported on\n" | |
197 | "this platform.")); | |
198 | } | |
199 | ||
d32dc48e PA |
200 | /* User interface for non-stop mode. */ |
201 | ||
491144b5 CB |
202 | bool non_stop = false; |
203 | static bool non_stop_1 = false; | |
d32dc48e PA |
204 | |
205 | static void | |
eb4c3f4a | 206 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
207 | struct cmd_list_element *c) |
208 | { | |
209 | if (target_has_execution) | |
210 | { | |
211 | non_stop_1 = non_stop; | |
212 | error (_("Cannot change this setting while the inferior is running.")); | |
213 | } | |
214 | ||
215 | non_stop = non_stop_1; | |
216 | } | |
217 | ||
218 | static void | |
219 | show_non_stop (struct ui_file *file, int from_tty, | |
220 | struct cmd_list_element *c, const char *value) | |
221 | { | |
222 | fprintf_filtered (file, | |
223 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
224 | value); | |
225 | } | |
226 | ||
d914c394 SS |
227 | /* "Observer mode" is somewhat like a more extreme version of |
228 | non-stop, in which all GDB operations that might affect the | |
229 | target's execution have been disabled. */ | |
230 | ||
491144b5 CB |
231 | bool observer_mode = false; |
232 | static bool observer_mode_1 = false; | |
d914c394 SS |
233 | |
234 | static void | |
eb4c3f4a | 235 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
236 | struct cmd_list_element *c) |
237 | { | |
d914c394 SS |
238 | if (target_has_execution) |
239 | { | |
240 | observer_mode_1 = observer_mode; | |
241 | error (_("Cannot change this setting while the inferior is running.")); | |
242 | } | |
243 | ||
244 | observer_mode = observer_mode_1; | |
245 | ||
246 | may_write_registers = !observer_mode; | |
247 | may_write_memory = !observer_mode; | |
248 | may_insert_breakpoints = !observer_mode; | |
249 | may_insert_tracepoints = !observer_mode; | |
250 | /* We can insert fast tracepoints in or out of observer mode, | |
251 | but enable them if we're going into this mode. */ | |
252 | if (observer_mode) | |
491144b5 | 253 | may_insert_fast_tracepoints = true; |
d914c394 SS |
254 | may_stop = !observer_mode; |
255 | update_target_permissions (); | |
256 | ||
257 | /* Going *into* observer mode we must force non-stop, then | |
258 | going out we leave it that way. */ | |
259 | if (observer_mode) | |
260 | { | |
d914c394 | 261 | pagination_enabled = 0; |
491144b5 | 262 | non_stop = non_stop_1 = true; |
d914c394 SS |
263 | } |
264 | ||
265 | if (from_tty) | |
266 | printf_filtered (_("Observer mode is now %s.\n"), | |
267 | (observer_mode ? "on" : "off")); | |
268 | } | |
269 | ||
270 | static void | |
271 | show_observer_mode (struct ui_file *file, int from_tty, | |
272 | struct cmd_list_element *c, const char *value) | |
273 | { | |
274 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
275 | } | |
276 | ||
277 | /* This updates the value of observer mode based on changes in | |
278 | permissions. Note that we are deliberately ignoring the values of | |
279 | may-write-registers and may-write-memory, since the user may have | |
280 | reason to enable these during a session, for instance to turn on a | |
281 | debugging-related global. */ | |
282 | ||
283 | void | |
284 | update_observer_mode (void) | |
285 | { | |
491144b5 CB |
286 | bool newval = (!may_insert_breakpoints |
287 | && !may_insert_tracepoints | |
288 | && may_insert_fast_tracepoints | |
289 | && !may_stop | |
290 | && non_stop); | |
d914c394 SS |
291 | |
292 | /* Let the user know if things change. */ | |
293 | if (newval != observer_mode) | |
294 | printf_filtered (_("Observer mode is now %s.\n"), | |
295 | (newval ? "on" : "off")); | |
296 | ||
297 | observer_mode = observer_mode_1 = newval; | |
298 | } | |
c2c6d25f | 299 | |
c906108c SS |
300 | /* Tables of how to react to signals; the user sets them. */ |
301 | ||
adc6a863 PA |
302 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
303 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
304 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 305 | |
ab04a2af TT |
306 | /* Table of signals that are registered with "catch signal". A |
307 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
308 | signal" command. */ |
309 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 310 | |
2455069d UW |
311 | /* Table of signals that the target may silently handle. |
312 | This is automatically determined from the flags above, | |
313 | and simply cached here. */ | |
adc6a863 | 314 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 315 | |
c906108c SS |
316 | #define SET_SIGS(nsigs,sigs,flags) \ |
317 | do { \ | |
318 | int signum = (nsigs); \ | |
319 | while (signum-- > 0) \ | |
320 | if ((sigs)[signum]) \ | |
321 | (flags)[signum] = 1; \ | |
322 | } while (0) | |
323 | ||
324 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
325 | do { \ | |
326 | int signum = (nsigs); \ | |
327 | while (signum-- > 0) \ | |
328 | if ((sigs)[signum]) \ | |
329 | (flags)[signum] = 0; \ | |
330 | } while (0) | |
331 | ||
9b224c5e PA |
332 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
333 | this function is to avoid exporting `signal_program'. */ | |
334 | ||
335 | void | |
336 | update_signals_program_target (void) | |
337 | { | |
adc6a863 | 338 | target_program_signals (signal_program); |
9b224c5e PA |
339 | } |
340 | ||
1777feb0 | 341 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 342 | |
edb3359d | 343 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
344 | |
345 | /* Command list pointer for the "stop" placeholder. */ | |
346 | ||
347 | static struct cmd_list_element *stop_command; | |
348 | ||
c906108c SS |
349 | /* Nonzero if we want to give control to the user when we're notified |
350 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 351 | int stop_on_solib_events; |
f9e14852 GB |
352 | |
353 | /* Enable or disable optional shared library event breakpoints | |
354 | as appropriate when the above flag is changed. */ | |
355 | ||
356 | static void | |
eb4c3f4a TT |
357 | set_stop_on_solib_events (const char *args, |
358 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
359 | { |
360 | update_solib_breakpoints (); | |
361 | } | |
362 | ||
920d2a44 AC |
363 | static void |
364 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
365 | struct cmd_list_element *c, const char *value) | |
366 | { | |
367 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
368 | value); | |
369 | } | |
c906108c | 370 | |
c906108c SS |
371 | /* Nonzero after stop if current stack frame should be printed. */ |
372 | ||
373 | static int stop_print_frame; | |
374 | ||
5b6d1e4f PA |
375 | /* This is a cached copy of the target/ptid/waitstatus of the last |
376 | event returned by target_wait()/deprecated_target_wait_hook(). | |
377 | This information is returned by get_last_target_status(). */ | |
378 | static process_stratum_target *target_last_proc_target; | |
39f77062 | 379 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
380 | static struct target_waitstatus target_last_waitstatus; |
381 | ||
4e1c45ea | 382 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 383 | |
53904c9e AC |
384 | static const char follow_fork_mode_child[] = "child"; |
385 | static const char follow_fork_mode_parent[] = "parent"; | |
386 | ||
40478521 | 387 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
388 | follow_fork_mode_child, |
389 | follow_fork_mode_parent, | |
390 | NULL | |
ef346e04 | 391 | }; |
c906108c | 392 | |
53904c9e | 393 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
394 | static void |
395 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
396 | struct cmd_list_element *c, const char *value) | |
397 | { | |
3e43a32a MS |
398 | fprintf_filtered (file, |
399 | _("Debugger response to a program " | |
400 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
401 | value); |
402 | } | |
c906108c SS |
403 | \f |
404 | ||
d83ad864 DB |
405 | /* Handle changes to the inferior list based on the type of fork, |
406 | which process is being followed, and whether the other process | |
407 | should be detached. On entry inferior_ptid must be the ptid of | |
408 | the fork parent. At return inferior_ptid is the ptid of the | |
409 | followed inferior. */ | |
410 | ||
5ab2fbf1 SM |
411 | static bool |
412 | follow_fork_inferior (bool follow_child, bool detach_fork) | |
d83ad864 DB |
413 | { |
414 | int has_vforked; | |
79639e11 | 415 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
416 | |
417 | has_vforked = (inferior_thread ()->pending_follow.kind | |
418 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
419 | parent_ptid = inferior_ptid; |
420 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
421 | |
422 | if (has_vforked | |
423 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 424 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
425 | && !(follow_child || detach_fork || sched_multi)) |
426 | { | |
427 | /* The parent stays blocked inside the vfork syscall until the | |
428 | child execs or exits. If we don't let the child run, then | |
429 | the parent stays blocked. If we're telling the parent to run | |
430 | in the foreground, the user will not be able to ctrl-c to get | |
431 | back the terminal, effectively hanging the debug session. */ | |
432 | fprintf_filtered (gdb_stderr, _("\ | |
433 | Can not resume the parent process over vfork in the foreground while\n\ | |
434 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
435 | \"set schedule-multiple\".\n")); | |
d83ad864 DB |
436 | return 1; |
437 | } | |
438 | ||
439 | if (!follow_child) | |
440 | { | |
441 | /* Detach new forked process? */ | |
442 | if (detach_fork) | |
443 | { | |
d83ad864 DB |
444 | /* Before detaching from the child, remove all breakpoints |
445 | from it. If we forked, then this has already been taken | |
446 | care of by infrun.c. If we vforked however, any | |
447 | breakpoint inserted in the parent is visible in the | |
448 | child, even those added while stopped in a vfork | |
449 | catchpoint. This will remove the breakpoints from the | |
450 | parent also, but they'll be reinserted below. */ | |
451 | if (has_vforked) | |
452 | { | |
453 | /* Keep breakpoints list in sync. */ | |
00431a78 | 454 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
455 | } |
456 | ||
f67c0c91 | 457 | if (print_inferior_events) |
d83ad864 | 458 | { |
8dd06f7a | 459 | /* Ensure that we have a process ptid. */ |
e99b03dc | 460 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 461 | |
223ffa71 | 462 | target_terminal::ours_for_output (); |
d83ad864 | 463 | fprintf_filtered (gdb_stdlog, |
f67c0c91 | 464 | _("[Detaching after %s from child %s]\n"), |
6f259a23 | 465 | has_vforked ? "vfork" : "fork", |
a068643d | 466 | target_pid_to_str (process_ptid).c_str ()); |
d83ad864 DB |
467 | } |
468 | } | |
469 | else | |
470 | { | |
471 | struct inferior *parent_inf, *child_inf; | |
d83ad864 DB |
472 | |
473 | /* Add process to GDB's tables. */ | |
e99b03dc | 474 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
475 | |
476 | parent_inf = current_inferior (); | |
477 | child_inf->attach_flag = parent_inf->attach_flag; | |
478 | copy_terminal_info (child_inf, parent_inf); | |
479 | child_inf->gdbarch = parent_inf->gdbarch; | |
480 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
481 | ||
5ed8105e | 482 | scoped_restore_current_pspace_and_thread restore_pspace_thread; |
d83ad864 | 483 | |
2a00d7ce | 484 | set_current_inferior (child_inf); |
5b6d1e4f | 485 | switch_to_no_thread (); |
d83ad864 | 486 | child_inf->symfile_flags = SYMFILE_NO_READ; |
5b6d1e4f PA |
487 | push_target (parent_inf->process_target ()); |
488 | add_thread_silent (child_inf->process_target (), child_ptid); | |
489 | inferior_ptid = child_ptid; | |
d83ad864 DB |
490 | |
491 | /* If this is a vfork child, then the address-space is | |
492 | shared with the parent. */ | |
493 | if (has_vforked) | |
494 | { | |
495 | child_inf->pspace = parent_inf->pspace; | |
496 | child_inf->aspace = parent_inf->aspace; | |
497 | ||
5b6d1e4f PA |
498 | exec_on_vfork (); |
499 | ||
d83ad864 DB |
500 | /* The parent will be frozen until the child is done |
501 | with the shared region. Keep track of the | |
502 | parent. */ | |
503 | child_inf->vfork_parent = parent_inf; | |
504 | child_inf->pending_detach = 0; | |
505 | parent_inf->vfork_child = child_inf; | |
506 | parent_inf->pending_detach = 0; | |
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 | ||
516 | /* Let the shared library layer (e.g., solib-svr4) learn | |
517 | about this new process, relocate the cloned exec, pull | |
518 | in shared libraries, and install the solib event | |
519 | breakpoint. If a "cloned-VM" event was propagated | |
520 | better throughout the core, this wouldn't be | |
521 | required. */ | |
522 | solib_create_inferior_hook (0); | |
523 | } | |
d83ad864 DB |
524 | } |
525 | ||
526 | if (has_vforked) | |
527 | { | |
528 | struct inferior *parent_inf; | |
529 | ||
530 | parent_inf = current_inferior (); | |
531 | ||
532 | /* If we detached from the child, then we have to be careful | |
533 | to not insert breakpoints in the parent until the child | |
534 | is done with the shared memory region. However, if we're | |
535 | staying attached to the child, then we can and should | |
536 | insert breakpoints, so that we can debug it. A | |
537 | subsequent child exec or exit is enough to know when does | |
538 | the child stops using the parent's address space. */ | |
539 | parent_inf->waiting_for_vfork_done = detach_fork; | |
540 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
541 | } | |
542 | } | |
543 | else | |
544 | { | |
545 | /* Follow the child. */ | |
546 | struct inferior *parent_inf, *child_inf; | |
547 | struct program_space *parent_pspace; | |
548 | ||
f67c0c91 | 549 | if (print_inferior_events) |
d83ad864 | 550 | { |
f67c0c91 SDJ |
551 | std::string parent_pid = target_pid_to_str (parent_ptid); |
552 | std::string child_pid = target_pid_to_str (child_ptid); | |
553 | ||
223ffa71 | 554 | target_terminal::ours_for_output (); |
6f259a23 | 555 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
556 | _("[Attaching after %s %s to child %s]\n"), |
557 | parent_pid.c_str (), | |
6f259a23 | 558 | has_vforked ? "vfork" : "fork", |
f67c0c91 | 559 | child_pid.c_str ()); |
d83ad864 DB |
560 | } |
561 | ||
562 | /* Add the new inferior first, so that the target_detach below | |
563 | doesn't unpush the target. */ | |
564 | ||
e99b03dc | 565 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
566 | |
567 | parent_inf = current_inferior (); | |
568 | child_inf->attach_flag = parent_inf->attach_flag; | |
569 | copy_terminal_info (child_inf, parent_inf); | |
570 | child_inf->gdbarch = parent_inf->gdbarch; | |
571 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
572 | ||
573 | parent_pspace = parent_inf->pspace; | |
574 | ||
5b6d1e4f | 575 | process_stratum_target *target = parent_inf->process_target (); |
d83ad864 | 576 | |
5b6d1e4f PA |
577 | { |
578 | /* Hold a strong reference to the target while (maybe) | |
579 | detaching the parent. Otherwise detaching could close the | |
580 | target. */ | |
581 | auto target_ref = target_ops_ref::new_reference (target); | |
582 | ||
583 | /* If we're vforking, we want to hold on to the parent until | |
584 | the child exits or execs. At child exec or exit time we | |
585 | can remove the old breakpoints from the parent and detach | |
586 | or resume debugging it. Otherwise, detach the parent now; | |
587 | we'll want to reuse it's program/address spaces, but we | |
588 | can't set them to the child before removing breakpoints | |
589 | from the parent, otherwise, the breakpoints module could | |
590 | decide to remove breakpoints from the wrong process (since | |
591 | they'd be assigned to the same address space). */ | |
592 | ||
593 | if (has_vforked) | |
594 | { | |
595 | gdb_assert (child_inf->vfork_parent == NULL); | |
596 | gdb_assert (parent_inf->vfork_child == NULL); | |
597 | child_inf->vfork_parent = parent_inf; | |
598 | child_inf->pending_detach = 0; | |
599 | parent_inf->vfork_child = child_inf; | |
600 | parent_inf->pending_detach = detach_fork; | |
601 | parent_inf->waiting_for_vfork_done = 0; | |
602 | } | |
603 | else if (detach_fork) | |
604 | { | |
605 | if (print_inferior_events) | |
606 | { | |
607 | /* Ensure that we have a process ptid. */ | |
608 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
609 | ||
610 | target_terminal::ours_for_output (); | |
611 | fprintf_filtered (gdb_stdlog, | |
612 | _("[Detaching after fork from " | |
613 | "parent %s]\n"), | |
614 | target_pid_to_str (process_ptid).c_str ()); | |
615 | } | |
8dd06f7a | 616 | |
5b6d1e4f PA |
617 | target_detach (parent_inf, 0); |
618 | parent_inf = NULL; | |
619 | } | |
6f259a23 | 620 | |
5b6d1e4f | 621 | /* Note that the detach above makes PARENT_INF dangling. */ |
d83ad864 | 622 | |
5b6d1e4f PA |
623 | /* Add the child thread to the appropriate lists, and switch |
624 | to this new thread, before cloning the program space, and | |
625 | informing the solib layer about this new process. */ | |
d83ad864 | 626 | |
5b6d1e4f PA |
627 | set_current_inferior (child_inf); |
628 | push_target (target); | |
629 | } | |
d83ad864 | 630 | |
5b6d1e4f | 631 | add_thread_silent (target, child_ptid); |
79639e11 | 632 | inferior_ptid = child_ptid; |
d83ad864 DB |
633 | |
634 | /* If this is a vfork child, then the address-space is shared | |
635 | with the parent. If we detached from the parent, then we can | |
636 | reuse the parent's program/address spaces. */ | |
637 | if (has_vforked || detach_fork) | |
638 | { | |
639 | child_inf->pspace = parent_pspace; | |
640 | child_inf->aspace = child_inf->pspace->aspace; | |
5b6d1e4f PA |
641 | |
642 | exec_on_vfork (); | |
d83ad864 DB |
643 | } |
644 | else | |
645 | { | |
646 | child_inf->aspace = new_address_space (); | |
564b1e3f | 647 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
648 | child_inf->removable = 1; |
649 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
650 | set_current_program_space (child_inf->pspace); | |
651 | clone_program_space (child_inf->pspace, parent_pspace); | |
652 | ||
653 | /* Let the shared library layer (e.g., solib-svr4) learn | |
654 | about this new process, relocate the cloned exec, pull in | |
655 | shared libraries, and install the solib event breakpoint. | |
656 | If a "cloned-VM" event was propagated better throughout | |
657 | the core, this wouldn't be required. */ | |
658 | solib_create_inferior_hook (0); | |
659 | } | |
660 | } | |
661 | ||
662 | return target_follow_fork (follow_child, detach_fork); | |
663 | } | |
664 | ||
e58b0e63 PA |
665 | /* Tell the target to follow the fork we're stopped at. Returns true |
666 | if the inferior should be resumed; false, if the target for some | |
667 | reason decided it's best not to resume. */ | |
668 | ||
5ab2fbf1 SM |
669 | static bool |
670 | follow_fork () | |
c906108c | 671 | { |
5ab2fbf1 SM |
672 | bool follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
673 | bool should_resume = true; | |
e58b0e63 PA |
674 | struct thread_info *tp; |
675 | ||
676 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
677 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
678 | parent thread structure's run control related fields, not just these. |
679 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
680 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 681 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
682 | CORE_ADDR step_range_start = 0; |
683 | CORE_ADDR step_range_end = 0; | |
684 | struct frame_id step_frame_id = { 0 }; | |
8980e177 | 685 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
686 | |
687 | if (!non_stop) | |
688 | { | |
5b6d1e4f | 689 | process_stratum_target *wait_target; |
e58b0e63 PA |
690 | ptid_t wait_ptid; |
691 | struct target_waitstatus wait_status; | |
692 | ||
693 | /* Get the last target status returned by target_wait(). */ | |
5b6d1e4f | 694 | get_last_target_status (&wait_target, &wait_ptid, &wait_status); |
e58b0e63 PA |
695 | |
696 | /* If not stopped at a fork event, then there's nothing else to | |
697 | do. */ | |
698 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
699 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
700 | return 1; | |
701 | ||
702 | /* Check if we switched over from WAIT_PTID, since the event was | |
703 | reported. */ | |
00431a78 | 704 | if (wait_ptid != minus_one_ptid |
5b6d1e4f PA |
705 | && (current_inferior ()->process_target () != wait_target |
706 | || inferior_ptid != wait_ptid)) | |
e58b0e63 PA |
707 | { |
708 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
709 | target to follow it (in either direction). We'll | |
710 | afterwards refuse to resume, and inform the user what | |
711 | happened. */ | |
5b6d1e4f | 712 | thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid); |
00431a78 | 713 | switch_to_thread (wait_thread); |
5ab2fbf1 | 714 | should_resume = false; |
e58b0e63 PA |
715 | } |
716 | } | |
717 | ||
718 | tp = inferior_thread (); | |
719 | ||
720 | /* If there were any forks/vforks that were caught and are now to be | |
721 | followed, then do so now. */ | |
722 | switch (tp->pending_follow.kind) | |
723 | { | |
724 | case TARGET_WAITKIND_FORKED: | |
725 | case TARGET_WAITKIND_VFORKED: | |
726 | { | |
727 | ptid_t parent, child; | |
728 | ||
729 | /* If the user did a next/step, etc, over a fork call, | |
730 | preserve the stepping state in the fork child. */ | |
731 | if (follow_child && should_resume) | |
732 | { | |
8358c15c JK |
733 | step_resume_breakpoint = clone_momentary_breakpoint |
734 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
735 | step_range_start = tp->control.step_range_start; |
736 | step_range_end = tp->control.step_range_end; | |
737 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
738 | exception_resume_breakpoint |
739 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 740 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
741 | |
742 | /* For now, delete the parent's sr breakpoint, otherwise, | |
743 | parent/child sr breakpoints are considered duplicates, | |
744 | and the child version will not be installed. Remove | |
745 | this when the breakpoints module becomes aware of | |
746 | inferiors and address spaces. */ | |
747 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
748 | tp->control.step_range_start = 0; |
749 | tp->control.step_range_end = 0; | |
750 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 751 | delete_exception_resume_breakpoint (tp); |
8980e177 | 752 | tp->thread_fsm = NULL; |
e58b0e63 PA |
753 | } |
754 | ||
755 | parent = inferior_ptid; | |
756 | child = tp->pending_follow.value.related_pid; | |
757 | ||
5b6d1e4f | 758 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
759 | /* Set up inferior(s) as specified by the caller, and tell the |
760 | target to do whatever is necessary to follow either parent | |
761 | or child. */ | |
762 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
763 | { |
764 | /* Target refused to follow, or there's some other reason | |
765 | we shouldn't resume. */ | |
766 | should_resume = 0; | |
767 | } | |
768 | else | |
769 | { | |
770 | /* This pending follow fork event is now handled, one way | |
771 | or another. The previous selected thread may be gone | |
772 | from the lists by now, but if it is still around, need | |
773 | to clear the pending follow request. */ | |
5b6d1e4f | 774 | tp = find_thread_ptid (parent_targ, parent); |
e58b0e63 PA |
775 | if (tp) |
776 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
777 | ||
778 | /* This makes sure we don't try to apply the "Switched | |
779 | over from WAIT_PID" logic above. */ | |
780 | nullify_last_target_wait_ptid (); | |
781 | ||
1777feb0 | 782 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
783 | if (follow_child) |
784 | { | |
5b6d1e4f | 785 | thread_info *child_thr = find_thread_ptid (parent_targ, child); |
00431a78 | 786 | switch_to_thread (child_thr); |
e58b0e63 PA |
787 | |
788 | /* ... and preserve the stepping state, in case the | |
789 | user was stepping over the fork call. */ | |
790 | if (should_resume) | |
791 | { | |
792 | tp = inferior_thread (); | |
8358c15c JK |
793 | tp->control.step_resume_breakpoint |
794 | = step_resume_breakpoint; | |
16c381f0 JK |
795 | tp->control.step_range_start = step_range_start; |
796 | tp->control.step_range_end = step_range_end; | |
797 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
798 | tp->control.exception_resume_breakpoint |
799 | = exception_resume_breakpoint; | |
8980e177 | 800 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
801 | } |
802 | else | |
803 | { | |
804 | /* If we get here, it was because we're trying to | |
805 | resume from a fork catchpoint, but, the user | |
806 | has switched threads away from the thread that | |
807 | forked. In that case, the resume command | |
808 | issued is most likely not applicable to the | |
809 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 810 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 811 | "before following fork child.")); |
e58b0e63 PA |
812 | } |
813 | ||
814 | /* Reset breakpoints in the child as appropriate. */ | |
815 | follow_inferior_reset_breakpoints (); | |
816 | } | |
e58b0e63 PA |
817 | } |
818 | } | |
819 | break; | |
820 | case TARGET_WAITKIND_SPURIOUS: | |
821 | /* Nothing to follow. */ | |
822 | break; | |
823 | default: | |
824 | internal_error (__FILE__, __LINE__, | |
825 | "Unexpected pending_follow.kind %d\n", | |
826 | tp->pending_follow.kind); | |
827 | break; | |
828 | } | |
c906108c | 829 | |
e58b0e63 | 830 | return should_resume; |
c906108c SS |
831 | } |
832 | ||
d83ad864 | 833 | static void |
6604731b | 834 | follow_inferior_reset_breakpoints (void) |
c906108c | 835 | { |
4e1c45ea PA |
836 | struct thread_info *tp = inferior_thread (); |
837 | ||
6604731b DJ |
838 | /* Was there a step_resume breakpoint? (There was if the user |
839 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
840 | thread number. Cloned step_resume breakpoints are disabled on |
841 | creation, so enable it here now that it is associated with the | |
842 | correct thread. | |
6604731b DJ |
843 | |
844 | step_resumes are a form of bp that are made to be per-thread. | |
845 | Since we created the step_resume bp when the parent process | |
846 | was being debugged, and now are switching to the child process, | |
847 | from the breakpoint package's viewpoint, that's a switch of | |
848 | "threads". We must update the bp's notion of which thread | |
849 | it is for, or it'll be ignored when it triggers. */ | |
850 | ||
8358c15c | 851 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
852 | { |
853 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
854 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
855 | } | |
6604731b | 856 | |
a1aa2221 | 857 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 858 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
859 | { |
860 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
861 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
862 | } | |
186c406b | 863 | |
6604731b DJ |
864 | /* Reinsert all breakpoints in the child. The user may have set |
865 | breakpoints after catching the fork, in which case those | |
866 | were never set in the child, but only in the parent. This makes | |
867 | sure the inserted breakpoints match the breakpoint list. */ | |
868 | ||
869 | breakpoint_re_set (); | |
870 | insert_breakpoints (); | |
c906108c | 871 | } |
c906108c | 872 | |
6c95b8df PA |
873 | /* The child has exited or execed: resume threads of the parent the |
874 | user wanted to be executing. */ | |
875 | ||
876 | static int | |
877 | proceed_after_vfork_done (struct thread_info *thread, | |
878 | void *arg) | |
879 | { | |
880 | int pid = * (int *) arg; | |
881 | ||
00431a78 PA |
882 | if (thread->ptid.pid () == pid |
883 | && thread->state == THREAD_RUNNING | |
884 | && !thread->executing | |
6c95b8df | 885 | && !thread->stop_requested |
a493e3e2 | 886 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df PA |
887 | { |
888 | if (debug_infrun) | |
889 | fprintf_unfiltered (gdb_stdlog, | |
890 | "infrun: resuming vfork parent thread %s\n", | |
a068643d | 891 | target_pid_to_str (thread->ptid).c_str ()); |
6c95b8df | 892 | |
00431a78 | 893 | switch_to_thread (thread); |
70509625 | 894 | clear_proceed_status (0); |
64ce06e4 | 895 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
896 | } |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
5ed8105e PA |
901 | /* Save/restore inferior_ptid, current program space and current |
902 | inferior. Only use this if the current context points at an exited | |
903 | inferior (and therefore there's no current thread to save). */ | |
904 | class scoped_restore_exited_inferior | |
905 | { | |
906 | public: | |
907 | scoped_restore_exited_inferior () | |
908 | : m_saved_ptid (&inferior_ptid) | |
909 | {} | |
910 | ||
911 | private: | |
912 | scoped_restore_tmpl<ptid_t> m_saved_ptid; | |
913 | scoped_restore_current_program_space m_pspace; | |
914 | scoped_restore_current_inferior m_inferior; | |
915 | }; | |
916 | ||
6c95b8df PA |
917 | /* Called whenever we notice an exec or exit event, to handle |
918 | detaching or resuming a vfork parent. */ | |
919 | ||
920 | static void | |
921 | handle_vfork_child_exec_or_exit (int exec) | |
922 | { | |
923 | struct inferior *inf = current_inferior (); | |
924 | ||
925 | if (inf->vfork_parent) | |
926 | { | |
927 | int resume_parent = -1; | |
928 | ||
929 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
930 | between the parent and the child. Break the bonds. */ |
931 | inferior *vfork_parent = inf->vfork_parent; | |
932 | inf->vfork_parent->vfork_child = NULL; | |
933 | inf->vfork_parent = NULL; | |
6c95b8df | 934 | |
b73715df TV |
935 | /* If the user wanted to detach from the parent, now is the |
936 | time. */ | |
937 | if (vfork_parent->pending_detach) | |
6c95b8df PA |
938 | { |
939 | struct thread_info *tp; | |
6c95b8df PA |
940 | struct program_space *pspace; |
941 | struct address_space *aspace; | |
942 | ||
1777feb0 | 943 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 944 | |
b73715df | 945 | vfork_parent->pending_detach = 0; |
68c9da30 | 946 | |
5ed8105e PA |
947 | gdb::optional<scoped_restore_exited_inferior> |
948 | maybe_restore_inferior; | |
949 | gdb::optional<scoped_restore_current_pspace_and_thread> | |
950 | maybe_restore_thread; | |
951 | ||
952 | /* If we're handling a child exit, then inferior_ptid points | |
953 | at the inferior's pid, not to a thread. */ | |
f50f4e56 | 954 | if (!exec) |
5ed8105e | 955 | maybe_restore_inferior.emplace (); |
f50f4e56 | 956 | else |
5ed8105e | 957 | maybe_restore_thread.emplace (); |
6c95b8df PA |
958 | |
959 | /* We're letting loose of the parent. */ | |
b73715df | 960 | tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 961 | switch_to_thread (tp); |
6c95b8df PA |
962 | |
963 | /* We're about to detach from the parent, which implicitly | |
964 | removes breakpoints from its address space. There's a | |
965 | catch here: we want to reuse the spaces for the child, | |
966 | but, parent/child are still sharing the pspace at this | |
967 | point, although the exec in reality makes the kernel give | |
968 | the child a fresh set of new pages. The problem here is | |
969 | that the breakpoints module being unaware of this, would | |
970 | likely chose the child process to write to the parent | |
971 | address space. Swapping the child temporarily away from | |
972 | the spaces has the desired effect. Yes, this is "sort | |
973 | of" a hack. */ | |
974 | ||
975 | pspace = inf->pspace; | |
976 | aspace = inf->aspace; | |
977 | inf->aspace = NULL; | |
978 | inf->pspace = NULL; | |
979 | ||
f67c0c91 | 980 | if (print_inferior_events) |
6c95b8df | 981 | { |
a068643d | 982 | std::string pidstr |
b73715df | 983 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 984 | |
223ffa71 | 985 | target_terminal::ours_for_output (); |
6c95b8df PA |
986 | |
987 | if (exec) | |
6f259a23 DB |
988 | { |
989 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 990 | _("[Detaching vfork parent %s " |
a068643d | 991 | "after child exec]\n"), pidstr.c_str ()); |
6f259a23 | 992 | } |
6c95b8df | 993 | else |
6f259a23 DB |
994 | { |
995 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 996 | _("[Detaching vfork parent %s " |
a068643d | 997 | "after child exit]\n"), pidstr.c_str ()); |
6f259a23 | 998 | } |
6c95b8df PA |
999 | } |
1000 | ||
b73715df | 1001 | target_detach (vfork_parent, 0); |
6c95b8df PA |
1002 | |
1003 | /* Put it back. */ | |
1004 | inf->pspace = pspace; | |
1005 | inf->aspace = aspace; | |
6c95b8df PA |
1006 | } |
1007 | else if (exec) | |
1008 | { | |
1009 | /* We're staying attached to the parent, so, really give the | |
1010 | child a new address space. */ | |
564b1e3f | 1011 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
1012 | inf->aspace = inf->pspace->aspace; |
1013 | inf->removable = 1; | |
1014 | set_current_program_space (inf->pspace); | |
1015 | ||
b73715df | 1016 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1017 | } |
1018 | else | |
1019 | { | |
6c95b8df PA |
1020 | /* If this is a vfork child exiting, then the pspace and |
1021 | aspaces were shared with the parent. Since we're | |
1022 | reporting the process exit, we'll be mourning all that is | |
1023 | found in the address space, and switching to null_ptid, | |
1024 | preparing to start a new inferior. But, since we don't | |
1025 | want to clobber the parent's address/program spaces, we | |
1026 | go ahead and create a new one for this exiting | |
1027 | inferior. */ | |
1028 | ||
5ed8105e PA |
1029 | /* Switch to null_ptid while running clone_program_space, so |
1030 | that clone_program_space doesn't want to read the | |
1031 | selected frame of a dead process. */ | |
1032 | scoped_restore restore_ptid | |
1033 | = make_scoped_restore (&inferior_ptid, null_ptid); | |
6c95b8df | 1034 | |
53af73bf PA |
1035 | inf->pspace = new program_space (maybe_new_address_space ()); |
1036 | inf->aspace = inf->pspace->aspace; | |
1037 | set_current_program_space (inf->pspace); | |
6c95b8df | 1038 | inf->removable = 1; |
7dcd53a0 | 1039 | inf->symfile_flags = SYMFILE_NO_READ; |
53af73bf | 1040 | clone_program_space (inf->pspace, vfork_parent->pspace); |
6c95b8df | 1041 | |
b73715df | 1042 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1043 | } |
1044 | ||
6c95b8df PA |
1045 | gdb_assert (current_program_space == inf->pspace); |
1046 | ||
1047 | if (non_stop && resume_parent != -1) | |
1048 | { | |
1049 | /* If the user wanted the parent to be running, let it go | |
1050 | free now. */ | |
5ed8105e | 1051 | scoped_restore_current_thread restore_thread; |
6c95b8df PA |
1052 | |
1053 | if (debug_infrun) | |
3e43a32a MS |
1054 | fprintf_unfiltered (gdb_stdlog, |
1055 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
1056 | resume_parent); |
1057 | ||
1058 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1059 | } |
1060 | } | |
1061 | } | |
1062 | ||
eb6c553b | 1063 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1064 | |
1065 | static const char follow_exec_mode_new[] = "new"; | |
1066 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1067 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1068 | { |
1069 | follow_exec_mode_new, | |
1070 | follow_exec_mode_same, | |
1071 | NULL, | |
1072 | }; | |
1073 | ||
1074 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1075 | static void | |
1076 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1077 | struct cmd_list_element *c, const char *value) | |
1078 | { | |
1079 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1080 | } | |
1081 | ||
ecf45d2c | 1082 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1083 | |
c906108c | 1084 | static void |
4ca51187 | 1085 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1086 | { |
6c95b8df | 1087 | struct inferior *inf = current_inferior (); |
e99b03dc | 1088 | int pid = ptid.pid (); |
94585166 | 1089 | ptid_t process_ptid; |
7a292a7a | 1090 | |
65d2b333 PW |
1091 | /* Switch terminal for any messages produced e.g. by |
1092 | breakpoint_re_set. */ | |
1093 | target_terminal::ours_for_output (); | |
1094 | ||
c906108c SS |
1095 | /* This is an exec event that we actually wish to pay attention to. |
1096 | Refresh our symbol table to the newly exec'd program, remove any | |
1097 | momentary bp's, etc. | |
1098 | ||
1099 | If there are breakpoints, they aren't really inserted now, | |
1100 | since the exec() transformed our inferior into a fresh set | |
1101 | of instructions. | |
1102 | ||
1103 | We want to preserve symbolic breakpoints on the list, since | |
1104 | we have hopes that they can be reset after the new a.out's | |
1105 | symbol table is read. | |
1106 | ||
1107 | However, any "raw" breakpoints must be removed from the list | |
1108 | (e.g., the solib bp's), since their address is probably invalid | |
1109 | now. | |
1110 | ||
1111 | And, we DON'T want to call delete_breakpoints() here, since | |
1112 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1113 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1114 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1115 | |
1116 | mark_breakpoints_out (); | |
1117 | ||
95e50b27 PA |
1118 | /* The target reports the exec event to the main thread, even if |
1119 | some other thread does the exec, and even if the main thread was | |
1120 | stopped or already gone. We may still have non-leader threads of | |
1121 | the process on our list. E.g., on targets that don't have thread | |
1122 | exit events (like remote); or on native Linux in non-stop mode if | |
1123 | there were only two threads in the inferior and the non-leader | |
1124 | one is the one that execs (and nothing forces an update of the | |
1125 | thread list up to here). When debugging remotely, it's best to | |
1126 | avoid extra traffic, when possible, so avoid syncing the thread | |
1127 | list with the target, and instead go ahead and delete all threads | |
1128 | of the process but one that reported the event. Note this must | |
1129 | be done before calling update_breakpoints_after_exec, as | |
1130 | otherwise clearing the threads' resources would reference stale | |
1131 | thread breakpoints -- it may have been one of these threads that | |
1132 | stepped across the exec. We could just clear their stepping | |
1133 | states, but as long as we're iterating, might as well delete | |
1134 | them. Deleting them now rather than at the next user-visible | |
1135 | stop provides a nicer sequence of events for user and MI | |
1136 | notifications. */ | |
08036331 | 1137 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1138 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1139 | delete_thread (th); |
95e50b27 PA |
1140 | |
1141 | /* We also need to clear any left over stale state for the | |
1142 | leader/event thread. E.g., if there was any step-resume | |
1143 | breakpoint or similar, it's gone now. We cannot truly | |
1144 | step-to-next statement through an exec(). */ | |
08036331 | 1145 | thread_info *th = inferior_thread (); |
8358c15c | 1146 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1147 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1148 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1149 | th->control.step_range_start = 0; |
1150 | th->control.step_range_end = 0; | |
c906108c | 1151 | |
95e50b27 PA |
1152 | /* The user may have had the main thread held stopped in the |
1153 | previous image (e.g., schedlock on, or non-stop). Release | |
1154 | it now. */ | |
a75724bc PA |
1155 | th->stop_requested = 0; |
1156 | ||
95e50b27 PA |
1157 | update_breakpoints_after_exec (); |
1158 | ||
1777feb0 | 1159 | /* What is this a.out's name? */ |
f2907e49 | 1160 | process_ptid = ptid_t (pid); |
6c95b8df | 1161 | printf_unfiltered (_("%s is executing new program: %s\n"), |
a068643d | 1162 | target_pid_to_str (process_ptid).c_str (), |
ecf45d2c | 1163 | exec_file_target); |
c906108c SS |
1164 | |
1165 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1166 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1167 | |
6ca15a4b | 1168 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1169 | |
797bc1cb TT |
1170 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1171 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1172 | |
ecf45d2c SL |
1173 | /* If we were unable to map the executable target pathname onto a host |
1174 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1175 | is confusing. Maybe it would even be better to stop at this point | |
1176 | so that the user can specify a file manually before continuing. */ | |
1177 | if (exec_file_host == NULL) | |
1178 | warning (_("Could not load symbols for executable %s.\n" | |
1179 | "Do you need \"set sysroot\"?"), | |
1180 | exec_file_target); | |
c906108c | 1181 | |
cce9b6bf PA |
1182 | /* Reset the shared library package. This ensures that we get a |
1183 | shlib event when the child reaches "_start", at which point the | |
1184 | dld will have had a chance to initialize the child. */ | |
1185 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1186 | we don't want those to be satisfied by the libraries of the | |
1187 | previous incarnation of this process. */ | |
1188 | no_shared_libraries (NULL, 0); | |
1189 | ||
6c95b8df PA |
1190 | if (follow_exec_mode_string == follow_exec_mode_new) |
1191 | { | |
6c95b8df PA |
1192 | /* The user wants to keep the old inferior and program spaces |
1193 | around. Create a new fresh one, and switch to it. */ | |
1194 | ||
35ed81d4 SM |
1195 | /* Do exit processing for the original inferior before setting the new |
1196 | inferior's pid. Having two inferiors with the same pid would confuse | |
1197 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1198 | old to the new inferior. */ | |
1199 | inf = add_inferior_with_spaces (); | |
1200 | swap_terminal_info (inf, current_inferior ()); | |
057302ce | 1201 | exit_inferior_silent (current_inferior ()); |
17d8546e | 1202 | |
94585166 | 1203 | inf->pid = pid; |
ecf45d2c | 1204 | target_follow_exec (inf, exec_file_target); |
6c95b8df | 1205 | |
5b6d1e4f PA |
1206 | inferior *org_inferior = current_inferior (); |
1207 | switch_to_inferior_no_thread (inf); | |
1208 | push_target (org_inferior->process_target ()); | |
1209 | thread_info *thr = add_thread (inf->process_target (), ptid); | |
1210 | switch_to_thread (thr); | |
6c95b8df | 1211 | } |
9107fc8d PA |
1212 | else |
1213 | { | |
1214 | /* The old description may no longer be fit for the new image. | |
1215 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1216 | old description; we'll read a new one below. No need to do | |
1217 | this on "follow-exec-mode new", as the old inferior stays | |
1218 | around (its description is later cleared/refetched on | |
1219 | restart). */ | |
1220 | target_clear_description (); | |
1221 | } | |
6c95b8df PA |
1222 | |
1223 | gdb_assert (current_program_space == inf->pspace); | |
1224 | ||
ecf45d2c SL |
1225 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1226 | because the proper displacement for a PIE (Position Independent | |
1227 | Executable) main symbol file will only be computed by | |
1228 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1229 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1230 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1231 | |
9107fc8d PA |
1232 | /* If the target can specify a description, read it. Must do this |
1233 | after flipping to the new executable (because the target supplied | |
1234 | description must be compatible with the executable's | |
1235 | architecture, and the old executable may e.g., be 32-bit, while | |
1236 | the new one 64-bit), and before anything involving memory or | |
1237 | registers. */ | |
1238 | target_find_description (); | |
1239 | ||
268a4a75 | 1240 | solib_create_inferior_hook (0); |
c906108c | 1241 | |
4efc6507 DE |
1242 | jit_inferior_created_hook (); |
1243 | ||
c1e56572 JK |
1244 | breakpoint_re_set (); |
1245 | ||
c906108c SS |
1246 | /* Reinsert all breakpoints. (Those which were symbolic have |
1247 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1248 | to symbol_file_command...). */ |
c906108c SS |
1249 | insert_breakpoints (); |
1250 | ||
1251 | /* The next resume of this inferior should bring it to the shlib | |
1252 | startup breakpoints. (If the user had also set bp's on | |
1253 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1254 | matically get reset there in the new process.). */ |
c906108c SS |
1255 | } |
1256 | ||
c2829269 PA |
1257 | /* The queue of threads that need to do a step-over operation to get |
1258 | past e.g., a breakpoint. What technique is used to step over the | |
1259 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1260 | same queue, to maintain rough temporal order of execution, in order | |
1261 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1262 | constantly stepping the same couple threads past their breakpoints | |
1263 | over and over, if the single-step finish fast enough. */ | |
1264 | struct thread_info *step_over_queue_head; | |
1265 | ||
6c4cfb24 PA |
1266 | /* Bit flags indicating what the thread needs to step over. */ |
1267 | ||
8d297bbf | 1268 | enum step_over_what_flag |
6c4cfb24 PA |
1269 | { |
1270 | /* Step over a breakpoint. */ | |
1271 | STEP_OVER_BREAKPOINT = 1, | |
1272 | ||
1273 | /* Step past a non-continuable watchpoint, in order to let the | |
1274 | instruction execute so we can evaluate the watchpoint | |
1275 | expression. */ | |
1276 | STEP_OVER_WATCHPOINT = 2 | |
1277 | }; | |
8d297bbf | 1278 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1279 | |
963f9c80 | 1280 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1281 | |
1282 | struct step_over_info | |
1283 | { | |
963f9c80 PA |
1284 | /* If we're stepping past a breakpoint, this is the address space |
1285 | and address of the instruction the breakpoint is set at. We'll | |
1286 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1287 | non-NULL. */ | |
8b86c959 | 1288 | const address_space *aspace; |
31e77af2 | 1289 | CORE_ADDR address; |
963f9c80 PA |
1290 | |
1291 | /* The instruction being stepped over triggers a nonsteppable | |
1292 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1293 | int nonsteppable_watchpoint_p; | |
21edc42f YQ |
1294 | |
1295 | /* The thread's global number. */ | |
1296 | int thread; | |
31e77af2 PA |
1297 | }; |
1298 | ||
1299 | /* The step-over info of the location that is being stepped over. | |
1300 | ||
1301 | Note that with async/breakpoint always-inserted mode, a user might | |
1302 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1303 | being stepped over. As setting a new breakpoint inserts all | |
1304 | breakpoints, we need to make sure the breakpoint being stepped over | |
1305 | isn't inserted then. We do that by only clearing the step-over | |
1306 | info when the step-over is actually finished (or aborted). | |
1307 | ||
1308 | Presently GDB can only step over one breakpoint at any given time. | |
1309 | Given threads that can't run code in the same address space as the | |
1310 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1311 | to step-over at most one breakpoint per address space (so this info | |
1312 | could move to the address space object if/when GDB is extended). | |
1313 | The set of breakpoints being stepped over will normally be much | |
1314 | smaller than the set of all breakpoints, so a flag in the | |
1315 | breakpoint location structure would be wasteful. A separate list | |
1316 | also saves complexity and run-time, as otherwise we'd have to go | |
1317 | through all breakpoint locations clearing their flag whenever we | |
1318 | start a new sequence. Similar considerations weigh against storing | |
1319 | this info in the thread object. Plus, not all step overs actually | |
1320 | have breakpoint locations -- e.g., stepping past a single-step | |
1321 | breakpoint, or stepping to complete a non-continuable | |
1322 | watchpoint. */ | |
1323 | static struct step_over_info step_over_info; | |
1324 | ||
1325 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1326 | stepping over. |
1327 | N.B. We record the aspace and address now, instead of say just the thread, | |
1328 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1329 | |
1330 | static void | |
8b86c959 | 1331 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1332 | int nonsteppable_watchpoint_p, |
1333 | int thread) | |
31e77af2 PA |
1334 | { |
1335 | step_over_info.aspace = aspace; | |
1336 | step_over_info.address = address; | |
963f9c80 | 1337 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1338 | step_over_info.thread = thread; |
31e77af2 PA |
1339 | } |
1340 | ||
1341 | /* Called when we're not longer stepping over a breakpoint / an | |
1342 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1343 | ||
1344 | static void | |
1345 | clear_step_over_info (void) | |
1346 | { | |
372316f1 PA |
1347 | if (debug_infrun) |
1348 | fprintf_unfiltered (gdb_stdlog, | |
1349 | "infrun: clear_step_over_info\n"); | |
31e77af2 PA |
1350 | step_over_info.aspace = NULL; |
1351 | step_over_info.address = 0; | |
963f9c80 | 1352 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1353 | step_over_info.thread = -1; |
31e77af2 PA |
1354 | } |
1355 | ||
7f89fd65 | 1356 | /* See infrun.h. */ |
31e77af2 PA |
1357 | |
1358 | int | |
1359 | stepping_past_instruction_at (struct address_space *aspace, | |
1360 | CORE_ADDR address) | |
1361 | { | |
1362 | return (step_over_info.aspace != NULL | |
1363 | && breakpoint_address_match (aspace, address, | |
1364 | step_over_info.aspace, | |
1365 | step_over_info.address)); | |
1366 | } | |
1367 | ||
963f9c80 PA |
1368 | /* See infrun.h. */ |
1369 | ||
21edc42f YQ |
1370 | int |
1371 | thread_is_stepping_over_breakpoint (int thread) | |
1372 | { | |
1373 | return (step_over_info.thread != -1 | |
1374 | && thread == step_over_info.thread); | |
1375 | } | |
1376 | ||
1377 | /* See infrun.h. */ | |
1378 | ||
963f9c80 PA |
1379 | int |
1380 | stepping_past_nonsteppable_watchpoint (void) | |
1381 | { | |
1382 | return step_over_info.nonsteppable_watchpoint_p; | |
1383 | } | |
1384 | ||
6cc83d2a PA |
1385 | /* Returns true if step-over info is valid. */ |
1386 | ||
1387 | static int | |
1388 | step_over_info_valid_p (void) | |
1389 | { | |
963f9c80 PA |
1390 | return (step_over_info.aspace != NULL |
1391 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1392 | } |
1393 | ||
c906108c | 1394 | \f |
237fc4c9 PA |
1395 | /* Displaced stepping. */ |
1396 | ||
1397 | /* In non-stop debugging mode, we must take special care to manage | |
1398 | breakpoints properly; in particular, the traditional strategy for | |
1399 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1400 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1401 | breakpoint it has hit while ensuring that other threads running | |
1402 | concurrently will hit the breakpoint as they should. | |
1403 | ||
1404 | The traditional way to step a thread T off a breakpoint in a | |
1405 | multi-threaded program in all-stop mode is as follows: | |
1406 | ||
1407 | a0) Initially, all threads are stopped, and breakpoints are not | |
1408 | inserted. | |
1409 | a1) We single-step T, leaving breakpoints uninserted. | |
1410 | a2) We insert breakpoints, and resume all threads. | |
1411 | ||
1412 | In non-stop debugging, however, this strategy is unsuitable: we | |
1413 | don't want to have to stop all threads in the system in order to | |
1414 | continue or step T past a breakpoint. Instead, we use displaced | |
1415 | stepping: | |
1416 | ||
1417 | n0) Initially, T is stopped, other threads are running, and | |
1418 | breakpoints are inserted. | |
1419 | n1) We copy the instruction "under" the breakpoint to a separate | |
1420 | location, outside the main code stream, making any adjustments | |
1421 | to the instruction, register, and memory state as directed by | |
1422 | T's architecture. | |
1423 | n2) We single-step T over the instruction at its new location. | |
1424 | n3) We adjust the resulting register and memory state as directed | |
1425 | by T's architecture. This includes resetting T's PC to point | |
1426 | back into the main instruction stream. | |
1427 | n4) We resume T. | |
1428 | ||
1429 | This approach depends on the following gdbarch methods: | |
1430 | ||
1431 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1432 | indicate where to copy the instruction, and how much space must | |
1433 | be reserved there. We use these in step n1. | |
1434 | ||
1435 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1436 | address, and makes any necessary adjustments to the instruction, | |
1437 | register contents, and memory. We use this in step n1. | |
1438 | ||
1439 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1440 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1441 | same effect the instruction would have had if we had executed it |
1442 | at its original address. We use this in step n3. | |
1443 | ||
237fc4c9 PA |
1444 | The gdbarch_displaced_step_copy_insn and |
1445 | gdbarch_displaced_step_fixup functions must be written so that | |
1446 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1447 | single-stepping across the copied instruction, and then applying | |
1448 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1449 | thread's memory and registers as stepping the instruction in place | |
1450 | would have. Exactly which responsibilities fall to the copy and | |
1451 | which fall to the fixup is up to the author of those functions. | |
1452 | ||
1453 | See the comments in gdbarch.sh for details. | |
1454 | ||
1455 | Note that displaced stepping and software single-step cannot | |
1456 | currently be used in combination, although with some care I think | |
1457 | they could be made to. Software single-step works by placing | |
1458 | breakpoints on all possible subsequent instructions; if the | |
1459 | displaced instruction is a PC-relative jump, those breakpoints | |
1460 | could fall in very strange places --- on pages that aren't | |
1461 | executable, or at addresses that are not proper instruction | |
1462 | boundaries. (We do generally let other threads run while we wait | |
1463 | to hit the software single-step breakpoint, and they might | |
1464 | encounter such a corrupted instruction.) One way to work around | |
1465 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1466 | simulate the effect of PC-relative instructions (and return NULL) | |
1467 | on architectures that use software single-stepping. | |
1468 | ||
1469 | In non-stop mode, we can have independent and simultaneous step | |
1470 | requests, so more than one thread may need to simultaneously step | |
1471 | over a breakpoint. The current implementation assumes there is | |
1472 | only one scratch space per process. In this case, we have to | |
1473 | serialize access to the scratch space. If thread A wants to step | |
1474 | over a breakpoint, but we are currently waiting for some other | |
1475 | thread to complete a displaced step, we leave thread A stopped and | |
1476 | place it in the displaced_step_request_queue. Whenever a displaced | |
1477 | step finishes, we pick the next thread in the queue and start a new | |
1478 | displaced step operation on it. See displaced_step_prepare and | |
1479 | displaced_step_fixup for details. */ | |
1480 | ||
cfba9872 SM |
1481 | /* Default destructor for displaced_step_closure. */ |
1482 | ||
1483 | displaced_step_closure::~displaced_step_closure () = default; | |
1484 | ||
fc1cf338 PA |
1485 | /* Get the displaced stepping state of process PID. */ |
1486 | ||
39a36629 | 1487 | static displaced_step_inferior_state * |
00431a78 | 1488 | get_displaced_stepping_state (inferior *inf) |
fc1cf338 | 1489 | { |
d20172fc | 1490 | return &inf->displaced_step_state; |
fc1cf338 PA |
1491 | } |
1492 | ||
372316f1 PA |
1493 | /* Returns true if any inferior has a thread doing a displaced |
1494 | step. */ | |
1495 | ||
39a36629 SM |
1496 | static bool |
1497 | displaced_step_in_progress_any_inferior () | |
372316f1 | 1498 | { |
d20172fc | 1499 | for (inferior *i : all_inferiors ()) |
39a36629 | 1500 | { |
d20172fc | 1501 | if (i->displaced_step_state.step_thread != nullptr) |
39a36629 SM |
1502 | return true; |
1503 | } | |
372316f1 | 1504 | |
39a36629 | 1505 | return false; |
372316f1 PA |
1506 | } |
1507 | ||
c0987663 YQ |
1508 | /* Return true if thread represented by PTID is doing a displaced |
1509 | step. */ | |
1510 | ||
1511 | static int | |
00431a78 | 1512 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1513 | { |
00431a78 | 1514 | gdb_assert (thread != NULL); |
c0987663 | 1515 | |
d20172fc | 1516 | return get_displaced_stepping_state (thread->inf)->step_thread == thread; |
c0987663 YQ |
1517 | } |
1518 | ||
8f572e5c PA |
1519 | /* Return true if process PID has a thread doing a displaced step. */ |
1520 | ||
1521 | static int | |
00431a78 | 1522 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1523 | { |
d20172fc | 1524 | return get_displaced_stepping_state (inf)->step_thread != nullptr; |
fc1cf338 PA |
1525 | } |
1526 | ||
a42244db YQ |
1527 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1528 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1529 | return NULL. */ | |
1530 | ||
1531 | struct displaced_step_closure* | |
1532 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1533 | { | |
d20172fc | 1534 | displaced_step_inferior_state *displaced |
00431a78 | 1535 | = get_displaced_stepping_state (current_inferior ()); |
a42244db YQ |
1536 | |
1537 | /* If checking the mode of displaced instruction in copy area. */ | |
d20172fc | 1538 | if (displaced->step_thread != nullptr |
00431a78 | 1539 | && displaced->step_copy == addr) |
d8d83535 | 1540 | return displaced->step_closure.get (); |
a42244db YQ |
1541 | |
1542 | return NULL; | |
1543 | } | |
1544 | ||
fc1cf338 PA |
1545 | static void |
1546 | infrun_inferior_exit (struct inferior *inf) | |
1547 | { | |
d20172fc | 1548 | inf->displaced_step_state.reset (); |
fc1cf338 | 1549 | } |
237fc4c9 | 1550 | |
fff08868 HZ |
1551 | /* If ON, and the architecture supports it, GDB will use displaced |
1552 | stepping to step over breakpoints. If OFF, or if the architecture | |
1553 | doesn't support it, GDB will instead use the traditional | |
1554 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1555 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1556 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1557 | |
72d0e2c5 | 1558 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1559 | |
237fc4c9 PA |
1560 | static void |
1561 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1562 | struct cmd_list_element *c, | |
1563 | const char *value) | |
1564 | { | |
72d0e2c5 | 1565 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1566 | fprintf_filtered (file, |
1567 | _("Debugger's willingness to use displaced stepping " | |
1568 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1569 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1570 | else |
3e43a32a MS |
1571 | fprintf_filtered (file, |
1572 | _("Debugger's willingness to use displaced stepping " | |
1573 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1574 | } |
1575 | ||
9822cb57 SM |
1576 | /* Return true if the gdbarch implements the required methods to use |
1577 | displaced stepping. */ | |
1578 | ||
1579 | static bool | |
1580 | gdbarch_supports_displaced_stepping (gdbarch *arch) | |
1581 | { | |
1582 | /* Only check for the presence of step_copy_insn. Other required methods | |
1583 | are checked by the gdbarch validation. */ | |
1584 | return gdbarch_displaced_step_copy_insn_p (arch); | |
1585 | } | |
1586 | ||
fff08868 | 1587 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1588 | over breakpoints of thread TP. */ |
fff08868 | 1589 | |
9822cb57 SM |
1590 | static bool |
1591 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1592 | { |
9822cb57 SM |
1593 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1594 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1595 | return false; | |
1596 | ||
1597 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1598 | way. */ | |
1599 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1600 | && !target_is_non_stop_p ()) | |
1601 | return false; | |
1602 | ||
1603 | gdbarch *gdbarch = get_thread_regcache (tp)->arch (); | |
1604 | ||
1605 | /* If the architecture doesn't implement displaced stepping, don't use | |
1606 | it. */ | |
1607 | if (!gdbarch_supports_displaced_stepping (gdbarch)) | |
1608 | return false; | |
1609 | ||
1610 | /* If recording, don't use displaced stepping. */ | |
1611 | if (find_record_target () != nullptr) | |
1612 | return false; | |
1613 | ||
d20172fc SM |
1614 | displaced_step_inferior_state *displaced_state |
1615 | = get_displaced_stepping_state (tp->inf); | |
3fc8eb30 | 1616 | |
9822cb57 SM |
1617 | /* If displaced stepping failed before for this inferior, don't bother trying |
1618 | again. */ | |
1619 | if (displaced_state->failed_before) | |
1620 | return false; | |
1621 | ||
1622 | return true; | |
237fc4c9 PA |
1623 | } |
1624 | ||
d8d83535 SM |
1625 | /* Simple function wrapper around displaced_step_inferior_state::reset. */ |
1626 | ||
237fc4c9 | 1627 | static void |
d8d83535 | 1628 | displaced_step_reset (displaced_step_inferior_state *displaced) |
237fc4c9 | 1629 | { |
d8d83535 | 1630 | displaced->reset (); |
237fc4c9 PA |
1631 | } |
1632 | ||
d8d83535 SM |
1633 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1634 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1635 | ||
1636 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 PA |
1637 | |
1638 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1639 | void | |
1640 | displaced_step_dump_bytes (struct ui_file *file, | |
1641 | const gdb_byte *buf, | |
1642 | size_t len) | |
1643 | { | |
1644 | int i; | |
1645 | ||
1646 | for (i = 0; i < len; i++) | |
1647 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1648 | fputs_unfiltered ("\n", file); | |
1649 | } | |
1650 | ||
1651 | /* Prepare to single-step, using displaced stepping. | |
1652 | ||
1653 | Note that we cannot use displaced stepping when we have a signal to | |
1654 | deliver. If we have a signal to deliver and an instruction to step | |
1655 | over, then after the step, there will be no indication from the | |
1656 | target whether the thread entered a signal handler or ignored the | |
1657 | signal and stepped over the instruction successfully --- both cases | |
1658 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1659 | fixup, and in the second case we must --- but we can't tell which. | |
1660 | Comments in the code for 'random signals' in handle_inferior_event | |
1661 | explain how we handle this case instead. | |
1662 | ||
1663 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1664 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1665 | if this instruction can't be displaced stepped. */ | |
1666 | ||
237fc4c9 | 1667 | static int |
00431a78 | 1668 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1669 | { |
00431a78 | 1670 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1671 | struct gdbarch *gdbarch = regcache->arch (); |
8b86c959 | 1672 | const address_space *aspace = regcache->aspace (); |
237fc4c9 PA |
1673 | CORE_ADDR original, copy; |
1674 | ULONGEST len; | |
9e529e1d | 1675 | int status; |
237fc4c9 PA |
1676 | |
1677 | /* We should never reach this function if the architecture does not | |
1678 | support displaced stepping. */ | |
9822cb57 | 1679 | gdb_assert (gdbarch_supports_displaced_stepping (gdbarch)); |
237fc4c9 | 1680 | |
c2829269 PA |
1681 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1682 | gdb_assert (tp->control.trap_expected); | |
1683 | ||
c1e36e3e PA |
1684 | /* Disable range stepping while executing in the scratch pad. We |
1685 | want a single-step even if executing the displaced instruction in | |
1686 | the scratch buffer lands within the stepping range (e.g., a | |
1687 | jump/branch). */ | |
1688 | tp->control.may_range_step = 0; | |
1689 | ||
fc1cf338 PA |
1690 | /* We have to displaced step one thread at a time, as we only have |
1691 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1692 | |
d20172fc SM |
1693 | displaced_step_inferior_state *displaced |
1694 | = get_displaced_stepping_state (tp->inf); | |
fc1cf338 | 1695 | |
00431a78 | 1696 | if (displaced->step_thread != nullptr) |
237fc4c9 PA |
1697 | { |
1698 | /* Already waiting for a displaced step to finish. Defer this | |
1699 | request and place in queue. */ | |
237fc4c9 PA |
1700 | |
1701 | if (debug_displaced) | |
1702 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1703 | "displaced: deferring step of %s\n", |
a068643d | 1704 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 | 1705 | |
c2829269 | 1706 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1707 | return 0; |
1708 | } | |
1709 | else | |
1710 | { | |
1711 | if (debug_displaced) | |
1712 | fprintf_unfiltered (gdb_stdlog, | |
1713 | "displaced: stepping %s now\n", | |
a068643d | 1714 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 PA |
1715 | } |
1716 | ||
d8d83535 | 1717 | displaced_step_reset (displaced); |
237fc4c9 | 1718 | |
00431a78 PA |
1719 | scoped_restore_current_thread restore_thread; |
1720 | ||
1721 | switch_to_thread (tp); | |
ad53cd71 | 1722 | |
515630c5 | 1723 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1724 | |
1725 | copy = gdbarch_displaced_step_location (gdbarch); | |
1726 | len = gdbarch_max_insn_length (gdbarch); | |
1727 | ||
d35ae833 PA |
1728 | if (breakpoint_in_range_p (aspace, copy, len)) |
1729 | { | |
1730 | /* There's a breakpoint set in the scratch pad location range | |
1731 | (which is usually around the entry point). We'd either | |
1732 | install it before resuming, which would overwrite/corrupt the | |
1733 | scratch pad, or if it was already inserted, this displaced | |
1734 | step would overwrite it. The latter is OK in the sense that | |
1735 | we already assume that no thread is going to execute the code | |
1736 | in the scratch pad range (after initial startup) anyway, but | |
1737 | the former is unacceptable. Simply punt and fallback to | |
1738 | stepping over this breakpoint in-line. */ | |
1739 | if (debug_displaced) | |
1740 | { | |
1741 | fprintf_unfiltered (gdb_stdlog, | |
1742 | "displaced: breakpoint set in scratch pad. " | |
1743 | "Stepping over breakpoint in-line instead.\n"); | |
1744 | } | |
1745 | ||
d35ae833 PA |
1746 | return -1; |
1747 | } | |
1748 | ||
237fc4c9 | 1749 | /* Save the original contents of the copy area. */ |
d20172fc SM |
1750 | displaced->step_saved_copy.resize (len); |
1751 | status = target_read_memory (copy, displaced->step_saved_copy.data (), len); | |
9e529e1d JK |
1752 | if (status != 0) |
1753 | throw_error (MEMORY_ERROR, | |
1754 | _("Error accessing memory address %s (%s) for " | |
1755 | "displaced-stepping scratch space."), | |
1756 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1757 | if (debug_displaced) |
1758 | { | |
5af949e3 UW |
1759 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1760 | paddress (gdbarch, copy)); | |
fc1cf338 | 1761 | displaced_step_dump_bytes (gdb_stdlog, |
d20172fc | 1762 | displaced->step_saved_copy.data (), |
fc1cf338 | 1763 | len); |
237fc4c9 PA |
1764 | }; |
1765 | ||
e8217e61 SM |
1766 | displaced->step_closure |
1767 | = gdbarch_displaced_step_copy_insn (gdbarch, original, copy, regcache); | |
1768 | if (displaced->step_closure == NULL) | |
7f03bd92 PA |
1769 | { |
1770 | /* The architecture doesn't know how or want to displaced step | |
1771 | this instruction or instruction sequence. Fallback to | |
1772 | stepping over the breakpoint in-line. */ | |
7f03bd92 PA |
1773 | return -1; |
1774 | } | |
237fc4c9 | 1775 | |
9f5a595d UW |
1776 | /* Save the information we need to fix things up if the step |
1777 | succeeds. */ | |
00431a78 | 1778 | displaced->step_thread = tp; |
fc1cf338 | 1779 | displaced->step_gdbarch = gdbarch; |
fc1cf338 PA |
1780 | displaced->step_original = original; |
1781 | displaced->step_copy = copy; | |
9f5a595d | 1782 | |
9799571e | 1783 | { |
d8d83535 | 1784 | displaced_step_reset_cleanup cleanup (displaced); |
237fc4c9 | 1785 | |
9799571e TT |
1786 | /* Resume execution at the copy. */ |
1787 | regcache_write_pc (regcache, copy); | |
237fc4c9 | 1788 | |
9799571e TT |
1789 | cleanup.release (); |
1790 | } | |
ad53cd71 | 1791 | |
237fc4c9 | 1792 | if (debug_displaced) |
5af949e3 UW |
1793 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1794 | paddress (gdbarch, copy)); | |
237fc4c9 | 1795 | |
237fc4c9 PA |
1796 | return 1; |
1797 | } | |
1798 | ||
3fc8eb30 PA |
1799 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1800 | attempts at displaced stepping if we get a memory error. */ | |
1801 | ||
1802 | static int | |
00431a78 | 1803 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 PA |
1804 | { |
1805 | int prepared = -1; | |
1806 | ||
a70b8144 | 1807 | try |
3fc8eb30 | 1808 | { |
00431a78 | 1809 | prepared = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1810 | } |
230d2906 | 1811 | catch (const gdb_exception_error &ex) |
3fc8eb30 PA |
1812 | { |
1813 | struct displaced_step_inferior_state *displaced_state; | |
1814 | ||
16b41842 PA |
1815 | if (ex.error != MEMORY_ERROR |
1816 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1817 | throw; |
3fc8eb30 PA |
1818 | |
1819 | if (debug_infrun) | |
1820 | { | |
1821 | fprintf_unfiltered (gdb_stdlog, | |
1822 | "infrun: disabling displaced stepping: %s\n", | |
3d6e9d23 | 1823 | ex.what ()); |
3fc8eb30 PA |
1824 | } |
1825 | ||
1826 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1827 | "auto". */ | |
1828 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1829 | { | |
fd7dcb94 | 1830 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1831 | ex.what ()); |
3fc8eb30 PA |
1832 | } |
1833 | ||
1834 | /* Disable further displaced stepping attempts. */ | |
1835 | displaced_state | |
00431a78 | 1836 | = get_displaced_stepping_state (thread->inf); |
3fc8eb30 PA |
1837 | displaced_state->failed_before = 1; |
1838 | } | |
3fc8eb30 PA |
1839 | |
1840 | return prepared; | |
1841 | } | |
1842 | ||
237fc4c9 | 1843 | static void |
3e43a32a MS |
1844 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1845 | const gdb_byte *myaddr, int len) | |
237fc4c9 | 1846 | { |
2989a365 | 1847 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
abbb1732 | 1848 | |
237fc4c9 PA |
1849 | inferior_ptid = ptid; |
1850 | write_memory (memaddr, myaddr, len); | |
237fc4c9 PA |
1851 | } |
1852 | ||
e2d96639 YQ |
1853 | /* Restore the contents of the copy area for thread PTID. */ |
1854 | ||
1855 | static void | |
1856 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1857 | ptid_t ptid) | |
1858 | { | |
1859 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1860 | ||
1861 | write_memory_ptid (ptid, displaced->step_copy, | |
d20172fc | 1862 | displaced->step_saved_copy.data (), len); |
e2d96639 YQ |
1863 | if (debug_displaced) |
1864 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
a068643d | 1865 | target_pid_to_str (ptid).c_str (), |
e2d96639 YQ |
1866 | paddress (displaced->step_gdbarch, |
1867 | displaced->step_copy)); | |
1868 | } | |
1869 | ||
372316f1 PA |
1870 | /* If we displaced stepped an instruction successfully, adjust |
1871 | registers and memory to yield the same effect the instruction would | |
1872 | have had if we had executed it at its original address, and return | |
1873 | 1. If the instruction didn't complete, relocate the PC and return | |
1874 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1875 | ||
1876 | static int | |
00431a78 | 1877 | displaced_step_fixup (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1878 | { |
fc1cf338 | 1879 | struct displaced_step_inferior_state *displaced |
00431a78 | 1880 | = get_displaced_stepping_state (event_thread->inf); |
372316f1 | 1881 | int ret; |
fc1cf338 | 1882 | |
00431a78 PA |
1883 | /* Was this event for the thread we displaced? */ |
1884 | if (displaced->step_thread != event_thread) | |
372316f1 | 1885 | return 0; |
237fc4c9 | 1886 | |
d8d83535 | 1887 | displaced_step_reset_cleanup cleanup (displaced); |
237fc4c9 | 1888 | |
00431a78 | 1889 | displaced_step_restore (displaced, displaced->step_thread->ptid); |
237fc4c9 | 1890 | |
cb71640d PA |
1891 | /* Fixup may need to read memory/registers. Switch to the thread |
1892 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
1893 | the current thread. */ | |
00431a78 | 1894 | switch_to_thread (event_thread); |
cb71640d | 1895 | |
237fc4c9 | 1896 | /* Did the instruction complete successfully? */ |
cb71640d PA |
1897 | if (signal == GDB_SIGNAL_TRAP |
1898 | && !(target_stopped_by_watchpoint () | |
1899 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
1900 | || target_have_steppable_watchpoint))) | |
237fc4c9 PA |
1901 | { |
1902 | /* Fix up the resulting state. */ | |
fc1cf338 | 1903 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
d8d83535 | 1904 | displaced->step_closure.get (), |
fc1cf338 PA |
1905 | displaced->step_original, |
1906 | displaced->step_copy, | |
00431a78 | 1907 | get_thread_regcache (displaced->step_thread)); |
372316f1 | 1908 | ret = 1; |
237fc4c9 PA |
1909 | } |
1910 | else | |
1911 | { | |
1912 | /* Since the instruction didn't complete, all we can do is | |
1913 | relocate the PC. */ | |
00431a78 | 1914 | struct regcache *regcache = get_thread_regcache (event_thread); |
515630c5 | 1915 | CORE_ADDR pc = regcache_read_pc (regcache); |
abbb1732 | 1916 | |
fc1cf338 | 1917 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1918 | regcache_write_pc (regcache, pc); |
372316f1 | 1919 | ret = -1; |
237fc4c9 PA |
1920 | } |
1921 | ||
372316f1 | 1922 | return ret; |
c2829269 | 1923 | } |
1c5cfe86 | 1924 | |
4d9d9d04 PA |
1925 | /* Data to be passed around while handling an event. This data is |
1926 | discarded between events. */ | |
1927 | struct execution_control_state | |
1928 | { | |
5b6d1e4f | 1929 | process_stratum_target *target; |
4d9d9d04 PA |
1930 | ptid_t ptid; |
1931 | /* The thread that got the event, if this was a thread event; NULL | |
1932 | otherwise. */ | |
1933 | struct thread_info *event_thread; | |
1934 | ||
1935 | struct target_waitstatus ws; | |
1936 | int stop_func_filled_in; | |
1937 | CORE_ADDR stop_func_start; | |
1938 | CORE_ADDR stop_func_end; | |
1939 | const char *stop_func_name; | |
1940 | int wait_some_more; | |
1941 | ||
1942 | /* True if the event thread hit the single-step breakpoint of | |
1943 | another thread. Thus the event doesn't cause a stop, the thread | |
1944 | needs to be single-stepped past the single-step breakpoint before | |
1945 | we can switch back to the original stepping thread. */ | |
1946 | int hit_singlestep_breakpoint; | |
1947 | }; | |
1948 | ||
1949 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1950 | |
1951 | static void | |
4d9d9d04 PA |
1952 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1953 | { | |
1954 | memset (ecs, 0, sizeof (*ecs)); | |
1955 | ecs->event_thread = tp; | |
1956 | ecs->ptid = tp->ptid; | |
1957 | } | |
1958 | ||
1959 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1960 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 1961 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1962 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1963 | |
1964 | /* Are there any pending step-over requests? If so, run all we can | |
1965 | now and return true. Otherwise, return false. */ | |
1966 | ||
1967 | static int | |
c2829269 PA |
1968 | start_step_over (void) |
1969 | { | |
1970 | struct thread_info *tp, *next; | |
1971 | ||
372316f1 PA |
1972 | /* Don't start a new step-over if we already have an in-line |
1973 | step-over operation ongoing. */ | |
1974 | if (step_over_info_valid_p ()) | |
1975 | return 0; | |
1976 | ||
c2829269 | 1977 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 1978 | { |
4d9d9d04 PA |
1979 | struct execution_control_state ecss; |
1980 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1981 | step_over_what step_what; |
372316f1 | 1982 | int must_be_in_line; |
c2829269 | 1983 | |
c65d6b55 PA |
1984 | gdb_assert (!tp->stop_requested); |
1985 | ||
c2829269 | 1986 | next = thread_step_over_chain_next (tp); |
237fc4c9 | 1987 | |
c2829269 PA |
1988 | /* If this inferior already has a displaced step in process, |
1989 | don't start a new one. */ | |
00431a78 | 1990 | if (displaced_step_in_progress (tp->inf)) |
c2829269 PA |
1991 | continue; |
1992 | ||
372316f1 PA |
1993 | step_what = thread_still_needs_step_over (tp); |
1994 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1995 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1996 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1997 | |
1998 | /* We currently stop all threads of all processes to step-over | |
1999 | in-line. If we need to start a new in-line step-over, let | |
2000 | any pending displaced steps finish first. */ | |
2001 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
2002 | return 0; | |
2003 | ||
c2829269 PA |
2004 | thread_step_over_chain_remove (tp); |
2005 | ||
2006 | if (step_over_queue_head == NULL) | |
2007 | { | |
2008 | if (debug_infrun) | |
2009 | fprintf_unfiltered (gdb_stdlog, | |
2010 | "infrun: step-over queue now empty\n"); | |
2011 | } | |
2012 | ||
372316f1 PA |
2013 | if (tp->control.trap_expected |
2014 | || tp->resumed | |
2015 | || tp->executing) | |
ad53cd71 | 2016 | { |
4d9d9d04 PA |
2017 | internal_error (__FILE__, __LINE__, |
2018 | "[%s] has inconsistent state: " | |
372316f1 | 2019 | "trap_expected=%d, resumed=%d, executing=%d\n", |
a068643d | 2020 | target_pid_to_str (tp->ptid).c_str (), |
4d9d9d04 | 2021 | tp->control.trap_expected, |
372316f1 | 2022 | tp->resumed, |
4d9d9d04 | 2023 | tp->executing); |
ad53cd71 | 2024 | } |
1c5cfe86 | 2025 | |
4d9d9d04 PA |
2026 | if (debug_infrun) |
2027 | fprintf_unfiltered (gdb_stdlog, | |
2028 | "infrun: resuming [%s] for step-over\n", | |
a068643d | 2029 | target_pid_to_str (tp->ptid).c_str ()); |
4d9d9d04 PA |
2030 | |
2031 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2032 | is no longer inserted. In all-stop, we want to keep looking | |
2033 | for a thread that needs a step-over instead of resuming TP, | |
2034 | because we wouldn't be able to resume anything else until the | |
2035 | target stops again. In non-stop, the resume always resumes | |
2036 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2037 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2038 | continue; |
8550d3b3 | 2039 | |
00431a78 | 2040 | switch_to_thread (tp); |
4d9d9d04 PA |
2041 | reset_ecs (ecs, tp); |
2042 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2043 | |
4d9d9d04 PA |
2044 | if (!ecs->wait_some_more) |
2045 | error (_("Command aborted.")); | |
1c5cfe86 | 2046 | |
372316f1 PA |
2047 | gdb_assert (tp->resumed); |
2048 | ||
2049 | /* If we started a new in-line step-over, we're done. */ | |
2050 | if (step_over_info_valid_p ()) | |
2051 | { | |
2052 | gdb_assert (tp->control.trap_expected); | |
2053 | return 1; | |
2054 | } | |
2055 | ||
fbea99ea | 2056 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2057 | { |
2058 | /* On all-stop, shouldn't have resumed unless we needed a | |
2059 | step over. */ | |
2060 | gdb_assert (tp->control.trap_expected | |
2061 | || tp->step_after_step_resume_breakpoint); | |
2062 | ||
2063 | /* With remote targets (at least), in all-stop, we can't | |
2064 | issue any further remote commands until the program stops | |
2065 | again. */ | |
2066 | return 1; | |
1c5cfe86 | 2067 | } |
c2829269 | 2068 | |
4d9d9d04 PA |
2069 | /* Either the thread no longer needed a step-over, or a new |
2070 | displaced stepping sequence started. Even in the latter | |
2071 | case, continue looking. Maybe we can also start another | |
2072 | displaced step on a thread of other process. */ | |
237fc4c9 | 2073 | } |
4d9d9d04 PA |
2074 | |
2075 | return 0; | |
237fc4c9 PA |
2076 | } |
2077 | ||
5231c1fd PA |
2078 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2079 | holding OLD_PTID. */ | |
2080 | static void | |
2081 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2082 | { | |
d7e15655 | 2083 | if (inferior_ptid == old_ptid) |
5231c1fd | 2084 | inferior_ptid = new_ptid; |
5231c1fd PA |
2085 | } |
2086 | ||
237fc4c9 | 2087 | \f |
c906108c | 2088 | |
53904c9e AC |
2089 | static const char schedlock_off[] = "off"; |
2090 | static const char schedlock_on[] = "on"; | |
2091 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2092 | static const char schedlock_replay[] = "replay"; |
40478521 | 2093 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2094 | schedlock_off, |
2095 | schedlock_on, | |
2096 | schedlock_step, | |
f2665db5 | 2097 | schedlock_replay, |
ef346e04 AC |
2098 | NULL |
2099 | }; | |
f2665db5 | 2100 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2101 | static void |
2102 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2103 | struct cmd_list_element *c, const char *value) | |
2104 | { | |
3e43a32a MS |
2105 | fprintf_filtered (file, |
2106 | _("Mode for locking scheduler " | |
2107 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2108 | value); |
2109 | } | |
c906108c SS |
2110 | |
2111 | static void | |
eb4c3f4a | 2112 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2113 | { |
eefe576e AC |
2114 | if (!target_can_lock_scheduler) |
2115 | { | |
2116 | scheduler_mode = schedlock_off; | |
2117 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2118 | } | |
c906108c SS |
2119 | } |
2120 | ||
d4db2f36 PA |
2121 | /* True if execution commands resume all threads of all processes by |
2122 | default; otherwise, resume only threads of the current inferior | |
2123 | process. */ | |
491144b5 | 2124 | bool sched_multi = false; |
d4db2f36 | 2125 | |
2facfe5c DD |
2126 | /* Try to setup for software single stepping over the specified location. |
2127 | Return 1 if target_resume() should use hardware single step. | |
2128 | ||
2129 | GDBARCH the current gdbarch. | |
2130 | PC the location to step over. */ | |
2131 | ||
2132 | static int | |
2133 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2134 | { | |
2135 | int hw_step = 1; | |
2136 | ||
f02253f1 | 2137 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2138 | && gdbarch_software_single_step_p (gdbarch)) |
2139 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2140 | ||
2facfe5c DD |
2141 | return hw_step; |
2142 | } | |
c906108c | 2143 | |
f3263aa4 PA |
2144 | /* See infrun.h. */ |
2145 | ||
09cee04b PA |
2146 | ptid_t |
2147 | user_visible_resume_ptid (int step) | |
2148 | { | |
f3263aa4 | 2149 | ptid_t resume_ptid; |
09cee04b | 2150 | |
09cee04b PA |
2151 | if (non_stop) |
2152 | { | |
2153 | /* With non-stop mode on, threads are always handled | |
2154 | individually. */ | |
2155 | resume_ptid = inferior_ptid; | |
2156 | } | |
2157 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2158 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2159 | { |
f3263aa4 PA |
2160 | /* User-settable 'scheduler' mode requires solo thread |
2161 | resume. */ | |
09cee04b PA |
2162 | resume_ptid = inferior_ptid; |
2163 | } | |
f2665db5 MM |
2164 | else if ((scheduler_mode == schedlock_replay) |
2165 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2166 | { | |
2167 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2168 | mode. */ | |
2169 | resume_ptid = inferior_ptid; | |
2170 | } | |
f3263aa4 PA |
2171 | else if (!sched_multi && target_supports_multi_process ()) |
2172 | { | |
2173 | /* Resume all threads of the current process (and none of other | |
2174 | processes). */ | |
e99b03dc | 2175 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2176 | } |
2177 | else | |
2178 | { | |
2179 | /* Resume all threads of all processes. */ | |
2180 | resume_ptid = RESUME_ALL; | |
2181 | } | |
09cee04b PA |
2182 | |
2183 | return resume_ptid; | |
2184 | } | |
2185 | ||
5b6d1e4f PA |
2186 | /* See infrun.h. */ |
2187 | ||
2188 | process_stratum_target * | |
2189 | user_visible_resume_target (ptid_t resume_ptid) | |
2190 | { | |
2191 | return (resume_ptid == minus_one_ptid && sched_multi | |
2192 | ? NULL | |
2193 | : current_inferior ()->process_target ()); | |
2194 | } | |
2195 | ||
fbea99ea PA |
2196 | /* Return a ptid representing the set of threads that we will resume, |
2197 | in the perspective of the target, assuming run control handling | |
2198 | does not require leaving some threads stopped (e.g., stepping past | |
2199 | breakpoint). USER_STEP indicates whether we're about to start the | |
2200 | target for a stepping command. */ | |
2201 | ||
2202 | static ptid_t | |
2203 | internal_resume_ptid (int user_step) | |
2204 | { | |
2205 | /* In non-stop, we always control threads individually. Note that | |
2206 | the target may always work in non-stop mode even with "set | |
2207 | non-stop off", in which case user_visible_resume_ptid could | |
2208 | return a wildcard ptid. */ | |
2209 | if (target_is_non_stop_p ()) | |
2210 | return inferior_ptid; | |
2211 | else | |
2212 | return user_visible_resume_ptid (user_step); | |
2213 | } | |
2214 | ||
64ce06e4 PA |
2215 | /* Wrapper for target_resume, that handles infrun-specific |
2216 | bookkeeping. */ | |
2217 | ||
2218 | static void | |
2219 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2220 | { | |
2221 | struct thread_info *tp = inferior_thread (); | |
2222 | ||
c65d6b55 PA |
2223 | gdb_assert (!tp->stop_requested); |
2224 | ||
64ce06e4 | 2225 | /* Install inferior's terminal modes. */ |
223ffa71 | 2226 | target_terminal::inferior (); |
64ce06e4 PA |
2227 | |
2228 | /* Avoid confusing the next resume, if the next stop/resume | |
2229 | happens to apply to another thread. */ | |
2230 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2231 | ||
8f572e5c PA |
2232 | /* Advise target which signals may be handled silently. |
2233 | ||
2234 | If we have removed breakpoints because we are stepping over one | |
2235 | in-line (in any thread), we need to receive all signals to avoid | |
2236 | accidentally skipping a breakpoint during execution of a signal | |
2237 | handler. | |
2238 | ||
2239 | Likewise if we're displaced stepping, otherwise a trap for a | |
2240 | breakpoint in a signal handler might be confused with the | |
2241 | displaced step finishing. We don't make the displaced_step_fixup | |
2242 | step distinguish the cases instead, because: | |
2243 | ||
2244 | - a backtrace while stopped in the signal handler would show the | |
2245 | scratch pad as frame older than the signal handler, instead of | |
2246 | the real mainline code. | |
2247 | ||
2248 | - when the thread is later resumed, the signal handler would | |
2249 | return to the scratch pad area, which would no longer be | |
2250 | valid. */ | |
2251 | if (step_over_info_valid_p () | |
00431a78 | 2252 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2253 | target_pass_signals ({}); |
64ce06e4 | 2254 | else |
adc6a863 | 2255 | target_pass_signals (signal_pass); |
64ce06e4 PA |
2256 | |
2257 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2258 | |
2259 | target_commit_resume (); | |
5b6d1e4f PA |
2260 | |
2261 | if (target_can_async_p ()) | |
2262 | target_async (1); | |
64ce06e4 PA |
2263 | } |
2264 | ||
d930703d | 2265 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2266 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2267 | call 'resume', which handles exceptions. */ | |
c906108c | 2268 | |
71d378ae PA |
2269 | static void |
2270 | resume_1 (enum gdb_signal sig) | |
c906108c | 2271 | { |
515630c5 | 2272 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2273 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2274 | struct thread_info *tp = inferior_thread (); |
515630c5 | 2275 | CORE_ADDR pc = regcache_read_pc (regcache); |
8b86c959 | 2276 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2277 | ptid_t resume_ptid; |
856e7dd6 PA |
2278 | /* This represents the user's step vs continue request. When |
2279 | deciding whether "set scheduler-locking step" applies, it's the | |
2280 | user's intention that counts. */ | |
2281 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2282 | /* This represents what we'll actually request the target to do. |
2283 | This can decay from a step to a continue, if e.g., we need to | |
2284 | implement single-stepping with breakpoints (software | |
2285 | single-step). */ | |
6b403daa | 2286 | int step; |
c7e8a53c | 2287 | |
c65d6b55 | 2288 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2289 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2290 | ||
372316f1 PA |
2291 | if (tp->suspend.waitstatus_pending_p) |
2292 | { | |
2293 | if (debug_infrun) | |
2294 | { | |
23fdd69e SM |
2295 | std::string statstr |
2296 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2297 | |
372316f1 | 2298 | fprintf_unfiltered (gdb_stdlog, |
23fdd69e SM |
2299 | "infrun: resume: thread %s has pending wait " |
2300 | "status %s (currently_stepping=%d).\n", | |
a068643d TT |
2301 | target_pid_to_str (tp->ptid).c_str (), |
2302 | statstr.c_str (), | |
372316f1 | 2303 | currently_stepping (tp)); |
372316f1 PA |
2304 | } |
2305 | ||
5b6d1e4f | 2306 | tp->inf->process_target ()->threads_executing = true; |
719546c4 | 2307 | tp->resumed = true; |
372316f1 PA |
2308 | |
2309 | /* FIXME: What should we do if we are supposed to resume this | |
2310 | thread with a signal? Maybe we should maintain a queue of | |
2311 | pending signals to deliver. */ | |
2312 | if (sig != GDB_SIGNAL_0) | |
2313 | { | |
fd7dcb94 | 2314 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d TT |
2315 | gdb_signal_to_name (sig), |
2316 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2317 | } |
2318 | ||
2319 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2320 | |
2321 | if (target_can_async_p ()) | |
9516f85a AB |
2322 | { |
2323 | target_async (1); | |
2324 | /* Tell the event loop we have an event to process. */ | |
2325 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2326 | } | |
372316f1 PA |
2327 | return; |
2328 | } | |
2329 | ||
2330 | tp->stepped_breakpoint = 0; | |
2331 | ||
6b403daa PA |
2332 | /* Depends on stepped_breakpoint. */ |
2333 | step = currently_stepping (tp); | |
2334 | ||
74609e71 YQ |
2335 | if (current_inferior ()->waiting_for_vfork_done) |
2336 | { | |
48f9886d PA |
2337 | /* Don't try to single-step a vfork parent that is waiting for |
2338 | the child to get out of the shared memory region (by exec'ing | |
2339 | or exiting). This is particularly important on software | |
2340 | single-step archs, as the child process would trip on the | |
2341 | software single step breakpoint inserted for the parent | |
2342 | process. Since the parent will not actually execute any | |
2343 | instruction until the child is out of the shared region (such | |
2344 | are vfork's semantics), it is safe to simply continue it. | |
2345 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2346 | the parent, and tell it to `keep_going', which automatically | |
2347 | re-sets it stepping. */ | |
74609e71 YQ |
2348 | if (debug_infrun) |
2349 | fprintf_unfiltered (gdb_stdlog, | |
2350 | "infrun: resume : clear step\n"); | |
a09dd441 | 2351 | step = 0; |
74609e71 YQ |
2352 | } |
2353 | ||
527159b7 | 2354 | if (debug_infrun) |
237fc4c9 | 2355 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 2356 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 2357 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
2358 | step, gdb_signal_to_symbol_string (sig), |
2359 | tp->control.trap_expected, | |
a068643d | 2360 | target_pid_to_str (inferior_ptid).c_str (), |
0d9a9a5f | 2361 | paddress (gdbarch, pc)); |
c906108c | 2362 | |
c2c6d25f JM |
2363 | /* Normally, by the time we reach `resume', the breakpoints are either |
2364 | removed or inserted, as appropriate. The exception is if we're sitting | |
2365 | at a permanent breakpoint; we need to step over it, but permanent | |
2366 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2367 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2368 | { |
af48d08f PA |
2369 | if (sig != GDB_SIGNAL_0) |
2370 | { | |
2371 | /* We have a signal to pass to the inferior. The resume | |
2372 | may, or may not take us to the signal handler. If this | |
2373 | is a step, we'll need to stop in the signal handler, if | |
2374 | there's one, (if the target supports stepping into | |
2375 | handlers), or in the next mainline instruction, if | |
2376 | there's no handler. If this is a continue, we need to be | |
2377 | sure to run the handler with all breakpoints inserted. | |
2378 | In all cases, set a breakpoint at the current address | |
2379 | (where the handler returns to), and once that breakpoint | |
2380 | is hit, resume skipping the permanent breakpoint. If | |
2381 | that breakpoint isn't hit, then we've stepped into the | |
2382 | signal handler (or hit some other event). We'll delete | |
2383 | the step-resume breakpoint then. */ | |
2384 | ||
2385 | if (debug_infrun) | |
2386 | fprintf_unfiltered (gdb_stdlog, | |
2387 | "infrun: resume: skipping permanent breakpoint, " | |
2388 | "deliver signal first\n"); | |
2389 | ||
2390 | clear_step_over_info (); | |
2391 | tp->control.trap_expected = 0; | |
2392 | ||
2393 | if (tp->control.step_resume_breakpoint == NULL) | |
2394 | { | |
2395 | /* Set a "high-priority" step-resume, as we don't want | |
2396 | user breakpoints at PC to trigger (again) when this | |
2397 | hits. */ | |
2398 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2399 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2400 | ||
2401 | tp->step_after_step_resume_breakpoint = step; | |
2402 | } | |
2403 | ||
2404 | insert_breakpoints (); | |
2405 | } | |
2406 | else | |
2407 | { | |
2408 | /* There's no signal to pass, we can go ahead and skip the | |
2409 | permanent breakpoint manually. */ | |
2410 | if (debug_infrun) | |
2411 | fprintf_unfiltered (gdb_stdlog, | |
2412 | "infrun: resume: skipping permanent breakpoint\n"); | |
2413 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
2414 | /* Update pc to reflect the new address from which we will | |
2415 | execute instructions. */ | |
2416 | pc = regcache_read_pc (regcache); | |
2417 | ||
2418 | if (step) | |
2419 | { | |
2420 | /* We've already advanced the PC, so the stepping part | |
2421 | is done. Now we need to arrange for a trap to be | |
2422 | reported to handle_inferior_event. Set a breakpoint | |
2423 | at the current PC, and run to it. Don't update | |
2424 | prev_pc, because if we end in | |
44a1ee51 PA |
2425 | switch_back_to_stepped_thread, we want the "expected |
2426 | thread advanced also" branch to be taken. IOW, we | |
2427 | don't want this thread to step further from PC | |
af48d08f | 2428 | (overstep). */ |
1ac806b8 | 2429 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2430 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2431 | insert_breakpoints (); | |
2432 | ||
fbea99ea | 2433 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2434 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
719546c4 | 2435 | tp->resumed = true; |
af48d08f PA |
2436 | return; |
2437 | } | |
2438 | } | |
6d350bb5 | 2439 | } |
c2c6d25f | 2440 | |
c1e36e3e PA |
2441 | /* If we have a breakpoint to step over, make sure to do a single |
2442 | step only. Same if we have software watchpoints. */ | |
2443 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2444 | tp->control.may_range_step = 0; | |
2445 | ||
7da6a5b9 LM |
2446 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2447 | copy of the instruction at a different address. | |
237fc4c9 PA |
2448 | |
2449 | We can't use displaced stepping when we have a signal to deliver; | |
2450 | the comments for displaced_step_prepare explain why. The | |
2451 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2452 | signals' explain what we do instead. |
2453 | ||
2454 | We can't use displaced stepping when we are waiting for vfork_done | |
2455 | event, displaced stepping breaks the vfork child similarly as single | |
2456 | step software breakpoint. */ | |
3fc8eb30 PA |
2457 | if (tp->control.trap_expected |
2458 | && use_displaced_stepping (tp) | |
cb71640d | 2459 | && !step_over_info_valid_p () |
a493e3e2 | 2460 | && sig == GDB_SIGNAL_0 |
74609e71 | 2461 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2462 | { |
00431a78 | 2463 | int prepared = displaced_step_prepare (tp); |
fc1cf338 | 2464 | |
3fc8eb30 | 2465 | if (prepared == 0) |
d56b7306 | 2466 | { |
4d9d9d04 PA |
2467 | if (debug_infrun) |
2468 | fprintf_unfiltered (gdb_stdlog, | |
2469 | "Got placed in step-over queue\n"); | |
2470 | ||
2471 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2472 | return; |
2473 | } | |
3fc8eb30 PA |
2474 | else if (prepared < 0) |
2475 | { | |
2476 | /* Fallback to stepping over the breakpoint in-line. */ | |
2477 | ||
2478 | if (target_is_non_stop_p ()) | |
2479 | stop_all_threads (); | |
2480 | ||
a01bda52 | 2481 | set_step_over_info (regcache->aspace (), |
21edc42f | 2482 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2483 | |
2484 | step = maybe_software_singlestep (gdbarch, pc); | |
2485 | ||
2486 | insert_breakpoints (); | |
2487 | } | |
2488 | else if (prepared > 0) | |
2489 | { | |
2490 | struct displaced_step_inferior_state *displaced; | |
99e40580 | 2491 | |
3fc8eb30 PA |
2492 | /* Update pc to reflect the new address from which we will |
2493 | execute instructions due to displaced stepping. */ | |
00431a78 | 2494 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2495 | |
00431a78 | 2496 | displaced = get_displaced_stepping_state (tp->inf); |
d8d83535 SM |
2497 | step = gdbarch_displaced_step_hw_singlestep |
2498 | (gdbarch, displaced->step_closure.get ()); | |
3fc8eb30 | 2499 | } |
237fc4c9 PA |
2500 | } |
2501 | ||
2facfe5c | 2502 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2503 | else if (step) |
2facfe5c | 2504 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2505 | |
30852783 UW |
2506 | /* Currently, our software single-step implementation leads to different |
2507 | results than hardware single-stepping in one situation: when stepping | |
2508 | into delivering a signal which has an associated signal handler, | |
2509 | hardware single-step will stop at the first instruction of the handler, | |
2510 | while software single-step will simply skip execution of the handler. | |
2511 | ||
2512 | For now, this difference in behavior is accepted since there is no | |
2513 | easy way to actually implement single-stepping into a signal handler | |
2514 | without kernel support. | |
2515 | ||
2516 | However, there is one scenario where this difference leads to follow-on | |
2517 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2518 | and then single-stepping. In this case, the software single-step | |
2519 | behavior means that even if there is a *breakpoint* in the signal | |
2520 | handler, GDB still would not stop. | |
2521 | ||
2522 | Fortunately, we can at least fix this particular issue. We detect | |
2523 | here the case where we are about to deliver a signal while software | |
2524 | single-stepping with breakpoints removed. In this situation, we | |
2525 | revert the decisions to remove all breakpoints and insert single- | |
2526 | step breakpoints, and instead we install a step-resume breakpoint | |
2527 | at the current address, deliver the signal without stepping, and | |
2528 | once we arrive back at the step-resume breakpoint, actually step | |
2529 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2530 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2531 | && sig != GDB_SIGNAL_0 |
2532 | && step_over_info_valid_p ()) | |
30852783 UW |
2533 | { |
2534 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2535 | immediately after a handler returns, might already have |
30852783 UW |
2536 | a step-resume breakpoint set on the earlier handler. We cannot |
2537 | set another step-resume breakpoint; just continue on until the | |
2538 | original breakpoint is hit. */ | |
2539 | if (tp->control.step_resume_breakpoint == NULL) | |
2540 | { | |
2c03e5be | 2541 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2542 | tp->step_after_step_resume_breakpoint = 1; |
2543 | } | |
2544 | ||
34b7e8a6 | 2545 | delete_single_step_breakpoints (tp); |
30852783 | 2546 | |
31e77af2 | 2547 | clear_step_over_info (); |
30852783 | 2548 | tp->control.trap_expected = 0; |
31e77af2 PA |
2549 | |
2550 | insert_breakpoints (); | |
30852783 UW |
2551 | } |
2552 | ||
b0f16a3e SM |
2553 | /* If STEP is set, it's a request to use hardware stepping |
2554 | facilities. But in that case, we should never | |
2555 | use singlestep breakpoint. */ | |
34b7e8a6 | 2556 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2557 | |
fbea99ea | 2558 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2559 | if (tp->control.trap_expected) |
b0f16a3e SM |
2560 | { |
2561 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2562 | hit, either by single-stepping the thread with the breakpoint |
2563 | removed, or by displaced stepping, with the breakpoint inserted. | |
2564 | In the former case, we need to single-step only this thread, | |
2565 | and keep others stopped, as they can miss this breakpoint if | |
2566 | allowed to run. That's not really a problem for displaced | |
2567 | stepping, but, we still keep other threads stopped, in case | |
2568 | another thread is also stopped for a breakpoint waiting for | |
2569 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2570 | resume_ptid = inferior_ptid; |
2571 | } | |
fbea99ea PA |
2572 | else |
2573 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2574 | |
7f5ef605 PA |
2575 | if (execution_direction != EXEC_REVERSE |
2576 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2577 | { |
372316f1 PA |
2578 | /* There are two cases where we currently need to step a |
2579 | breakpoint instruction when we have a signal to deliver: | |
2580 | ||
2581 | - See handle_signal_stop where we handle random signals that | |
2582 | could take out us out of the stepping range. Normally, in | |
2583 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2584 | signal handler with a breakpoint at PC, but there are cases |
2585 | where we should _always_ single-step, even if we have a | |
2586 | step-resume breakpoint, like when a software watchpoint is | |
2587 | set. Assuming single-stepping and delivering a signal at the | |
2588 | same time would takes us to the signal handler, then we could | |
2589 | have removed the breakpoint at PC to step over it. However, | |
2590 | some hardware step targets (like e.g., Mac OS) can't step | |
2591 | into signal handlers, and for those, we need to leave the | |
2592 | breakpoint at PC inserted, as otherwise if the handler | |
2593 | recurses and executes PC again, it'll miss the breakpoint. | |
2594 | So we leave the breakpoint inserted anyway, but we need to | |
2595 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2596 | that adjust_pc_after_break doesn't end up confused. |
2597 | ||
2598 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2599 | in one thread after another thread that was stepping had been | |
2600 | momentarily paused for a step-over. When we re-resume the | |
2601 | stepping thread, it may be resumed from that address with a | |
2602 | breakpoint that hasn't trapped yet. Seen with | |
2603 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2604 | do displaced stepping. */ | |
2605 | ||
2606 | if (debug_infrun) | |
2607 | fprintf_unfiltered (gdb_stdlog, | |
2608 | "infrun: resume: [%s] stepped breakpoint\n", | |
a068643d | 2609 | target_pid_to_str (tp->ptid).c_str ()); |
7f5ef605 PA |
2610 | |
2611 | tp->stepped_breakpoint = 1; | |
2612 | ||
b0f16a3e SM |
2613 | /* Most targets can step a breakpoint instruction, thus |
2614 | executing it normally. But if this one cannot, just | |
2615 | continue and we will hit it anyway. */ | |
7f5ef605 | 2616 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2617 | step = 0; |
2618 | } | |
ef5cf84e | 2619 | |
b0f16a3e | 2620 | if (debug_displaced |
cb71640d | 2621 | && tp->control.trap_expected |
3fc8eb30 | 2622 | && use_displaced_stepping (tp) |
cb71640d | 2623 | && !step_over_info_valid_p ()) |
b0f16a3e | 2624 | { |
00431a78 | 2625 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2626 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2627 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2628 | gdb_byte buf[4]; | |
2629 | ||
2630 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2631 | paddress (resume_gdbarch, actual_pc)); | |
2632 | read_memory (actual_pc, buf, sizeof (buf)); | |
2633 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2634 | } | |
237fc4c9 | 2635 | |
b0f16a3e SM |
2636 | if (tp->control.may_range_step) |
2637 | { | |
2638 | /* If we're resuming a thread with the PC out of the step | |
2639 | range, then we're doing some nested/finer run control | |
2640 | operation, like stepping the thread out of the dynamic | |
2641 | linker or the displaced stepping scratch pad. We | |
2642 | shouldn't have allowed a range step then. */ | |
2643 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2644 | } | |
c1e36e3e | 2645 | |
64ce06e4 | 2646 | do_target_resume (resume_ptid, step, sig); |
719546c4 | 2647 | tp->resumed = true; |
c906108c | 2648 | } |
71d378ae PA |
2649 | |
2650 | /* Resume the inferior. SIG is the signal to give the inferior | |
2651 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2652 | rolls back state on error. */ | |
2653 | ||
aff4e175 | 2654 | static void |
71d378ae PA |
2655 | resume (gdb_signal sig) |
2656 | { | |
a70b8144 | 2657 | try |
71d378ae PA |
2658 | { |
2659 | resume_1 (sig); | |
2660 | } | |
230d2906 | 2661 | catch (const gdb_exception &ex) |
71d378ae PA |
2662 | { |
2663 | /* If resuming is being aborted for any reason, delete any | |
2664 | single-step breakpoint resume_1 may have created, to avoid | |
2665 | confusing the following resumption, and to avoid leaving | |
2666 | single-step breakpoints perturbing other threads, in case | |
2667 | we're running in non-stop mode. */ | |
2668 | if (inferior_ptid != null_ptid) | |
2669 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2670 | throw; |
71d378ae | 2671 | } |
71d378ae PA |
2672 | } |
2673 | ||
c906108c | 2674 | \f |
237fc4c9 | 2675 | /* Proceeding. */ |
c906108c | 2676 | |
4c2f2a79 PA |
2677 | /* See infrun.h. */ |
2678 | ||
2679 | /* Counter that tracks number of user visible stops. This can be used | |
2680 | to tell whether a command has proceeded the inferior past the | |
2681 | current location. This allows e.g., inferior function calls in | |
2682 | breakpoint commands to not interrupt the command list. When the | |
2683 | call finishes successfully, the inferior is standing at the same | |
2684 | breakpoint as if nothing happened (and so we don't call | |
2685 | normal_stop). */ | |
2686 | static ULONGEST current_stop_id; | |
2687 | ||
2688 | /* See infrun.h. */ | |
2689 | ||
2690 | ULONGEST | |
2691 | get_stop_id (void) | |
2692 | { | |
2693 | return current_stop_id; | |
2694 | } | |
2695 | ||
2696 | /* Called when we report a user visible stop. */ | |
2697 | ||
2698 | static void | |
2699 | new_stop_id (void) | |
2700 | { | |
2701 | current_stop_id++; | |
2702 | } | |
2703 | ||
c906108c SS |
2704 | /* Clear out all variables saying what to do when inferior is continued. |
2705 | First do this, then set the ones you want, then call `proceed'. */ | |
2706 | ||
a7212384 UW |
2707 | static void |
2708 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2709 | { |
a7212384 UW |
2710 | if (debug_infrun) |
2711 | fprintf_unfiltered (gdb_stdlog, | |
2712 | "infrun: clear_proceed_status_thread (%s)\n", | |
a068643d | 2713 | target_pid_to_str (tp->ptid).c_str ()); |
d6b48e9c | 2714 | |
372316f1 PA |
2715 | /* If we're starting a new sequence, then the previous finished |
2716 | single-step is no longer relevant. */ | |
2717 | if (tp->suspend.waitstatus_pending_p) | |
2718 | { | |
2719 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2720 | { | |
2721 | if (debug_infrun) | |
2722 | fprintf_unfiltered (gdb_stdlog, | |
2723 | "infrun: clear_proceed_status: pending " | |
2724 | "event of %s was a finished step. " | |
2725 | "Discarding.\n", | |
a068643d | 2726 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
2727 | |
2728 | tp->suspend.waitstatus_pending_p = 0; | |
2729 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2730 | } | |
2731 | else if (debug_infrun) | |
2732 | { | |
23fdd69e SM |
2733 | std::string statstr |
2734 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2735 | |
372316f1 PA |
2736 | fprintf_unfiltered (gdb_stdlog, |
2737 | "infrun: clear_proceed_status_thread: thread %s " | |
2738 | "has pending wait status %s " | |
2739 | "(currently_stepping=%d).\n", | |
a068643d TT |
2740 | target_pid_to_str (tp->ptid).c_str (), |
2741 | statstr.c_str (), | |
372316f1 | 2742 | currently_stepping (tp)); |
372316f1 PA |
2743 | } |
2744 | } | |
2745 | ||
70509625 PA |
2746 | /* If this signal should not be seen by program, give it zero. |
2747 | Used for debugging signals. */ | |
2748 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2749 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2750 | ||
46e3ed7f | 2751 | delete tp->thread_fsm; |
243a9253 PA |
2752 | tp->thread_fsm = NULL; |
2753 | ||
16c381f0 JK |
2754 | tp->control.trap_expected = 0; |
2755 | tp->control.step_range_start = 0; | |
2756 | tp->control.step_range_end = 0; | |
c1e36e3e | 2757 | tp->control.may_range_step = 0; |
16c381f0 JK |
2758 | tp->control.step_frame_id = null_frame_id; |
2759 | tp->control.step_stack_frame_id = null_frame_id; | |
2760 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2761 | tp->control.step_start_function = NULL; |
a7212384 | 2762 | tp->stop_requested = 0; |
4e1c45ea | 2763 | |
16c381f0 | 2764 | tp->control.stop_step = 0; |
32400beb | 2765 | |
16c381f0 | 2766 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2767 | |
856e7dd6 | 2768 | tp->control.stepping_command = 0; |
17b2616c | 2769 | |
a7212384 | 2770 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2771 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2772 | } |
32400beb | 2773 | |
a7212384 | 2774 | void |
70509625 | 2775 | clear_proceed_status (int step) |
a7212384 | 2776 | { |
f2665db5 MM |
2777 | /* With scheduler-locking replay, stop replaying other threads if we're |
2778 | not replaying the user-visible resume ptid. | |
2779 | ||
2780 | This is a convenience feature to not require the user to explicitly | |
2781 | stop replaying the other threads. We're assuming that the user's | |
2782 | intent is to resume tracing the recorded process. */ | |
2783 | if (!non_stop && scheduler_mode == schedlock_replay | |
2784 | && target_record_is_replaying (minus_one_ptid) | |
2785 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2786 | execution_direction)) | |
2787 | target_record_stop_replaying (); | |
2788 | ||
08036331 | 2789 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2790 | { |
08036331 | 2791 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2792 | process_stratum_target *resume_target |
2793 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2794 | |
2795 | /* In all-stop mode, delete the per-thread status of all threads | |
2796 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2797 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2798 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2799 | } |
2800 | ||
d7e15655 | 2801 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2802 | { |
2803 | struct inferior *inferior; | |
2804 | ||
2805 | if (non_stop) | |
2806 | { | |
6c95b8df PA |
2807 | /* If in non-stop mode, only delete the per-thread status of |
2808 | the current thread. */ | |
a7212384 UW |
2809 | clear_proceed_status_thread (inferior_thread ()); |
2810 | } | |
6c95b8df | 2811 | |
d6b48e9c | 2812 | inferior = current_inferior (); |
16c381f0 | 2813 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2814 | } |
2815 | ||
76727919 | 2816 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2817 | } |
2818 | ||
99619bea PA |
2819 | /* Returns true if TP is still stopped at a breakpoint that needs |
2820 | stepping-over in order to make progress. If the breakpoint is gone | |
2821 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2822 | |
2823 | static int | |
6c4cfb24 | 2824 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2825 | { |
2826 | if (tp->stepping_over_breakpoint) | |
2827 | { | |
00431a78 | 2828 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2829 | |
a01bda52 | 2830 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2831 | regcache_read_pc (regcache)) |
2832 | == ordinary_breakpoint_here) | |
99619bea PA |
2833 | return 1; |
2834 | ||
2835 | tp->stepping_over_breakpoint = 0; | |
2836 | } | |
2837 | ||
2838 | return 0; | |
2839 | } | |
2840 | ||
6c4cfb24 PA |
2841 | /* Check whether thread TP still needs to start a step-over in order |
2842 | to make progress when resumed. Returns an bitwise or of enum | |
2843 | step_over_what bits, indicating what needs to be stepped over. */ | |
2844 | ||
8d297bbf | 2845 | static step_over_what |
6c4cfb24 PA |
2846 | thread_still_needs_step_over (struct thread_info *tp) |
2847 | { | |
8d297bbf | 2848 | step_over_what what = 0; |
6c4cfb24 PA |
2849 | |
2850 | if (thread_still_needs_step_over_bp (tp)) | |
2851 | what |= STEP_OVER_BREAKPOINT; | |
2852 | ||
2853 | if (tp->stepping_over_watchpoint | |
2854 | && !target_have_steppable_watchpoint) | |
2855 | what |= STEP_OVER_WATCHPOINT; | |
2856 | ||
2857 | return what; | |
2858 | } | |
2859 | ||
483805cf PA |
2860 | /* Returns true if scheduler locking applies. STEP indicates whether |
2861 | we're about to do a step/next-like command to a thread. */ | |
2862 | ||
2863 | static int | |
856e7dd6 | 2864 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2865 | { |
2866 | return (scheduler_mode == schedlock_on | |
2867 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2868 | && tp->control.stepping_command) |
2869 | || (scheduler_mode == schedlock_replay | |
2870 | && target_record_will_replay (minus_one_ptid, | |
2871 | execution_direction))); | |
483805cf PA |
2872 | } |
2873 | ||
5b6d1e4f PA |
2874 | /* Calls target_commit_resume on all targets. */ |
2875 | ||
2876 | static void | |
2877 | commit_resume_all_targets () | |
2878 | { | |
2879 | scoped_restore_current_thread restore_thread; | |
2880 | ||
2881 | /* Map between process_target and a representative inferior. This | |
2882 | is to avoid committing a resume in the same target more than | |
2883 | once. Resumptions must be idempotent, so this is an | |
2884 | optimization. */ | |
2885 | std::unordered_map<process_stratum_target *, inferior *> conn_inf; | |
2886 | ||
2887 | for (inferior *inf : all_non_exited_inferiors ()) | |
2888 | if (inf->has_execution ()) | |
2889 | conn_inf[inf->process_target ()] = inf; | |
2890 | ||
2891 | for (const auto &ci : conn_inf) | |
2892 | { | |
2893 | inferior *inf = ci.second; | |
2894 | switch_to_inferior_no_thread (inf); | |
2895 | target_commit_resume (); | |
2896 | } | |
2897 | } | |
2898 | ||
2f4fcf00 PA |
2899 | /* Check that all the targets we're about to resume are in non-stop |
2900 | mode. Ideally, we'd only care whether all targets support | |
2901 | target-async, but we're not there yet. E.g., stop_all_threads | |
2902 | doesn't know how to handle all-stop targets. Also, the remote | |
2903 | protocol in all-stop mode is synchronous, irrespective of | |
2904 | target-async, which means that things like a breakpoint re-set | |
2905 | triggered by one target would try to read memory from all targets | |
2906 | and fail. */ | |
2907 | ||
2908 | static void | |
2909 | check_multi_target_resumption (process_stratum_target *resume_target) | |
2910 | { | |
2911 | if (!non_stop && resume_target == nullptr) | |
2912 | { | |
2913 | scoped_restore_current_thread restore_thread; | |
2914 | ||
2915 | /* This is used to track whether we're resuming more than one | |
2916 | target. */ | |
2917 | process_stratum_target *first_connection = nullptr; | |
2918 | ||
2919 | /* The first inferior we see with a target that does not work in | |
2920 | always-non-stop mode. */ | |
2921 | inferior *first_not_non_stop = nullptr; | |
2922 | ||
2923 | for (inferior *inf : all_non_exited_inferiors (resume_target)) | |
2924 | { | |
2925 | switch_to_inferior_no_thread (inf); | |
2926 | ||
2927 | if (!target_has_execution) | |
2928 | continue; | |
2929 | ||
2930 | process_stratum_target *proc_target | |
2931 | = current_inferior ()->process_target(); | |
2932 | ||
2933 | if (!target_is_non_stop_p ()) | |
2934 | first_not_non_stop = inf; | |
2935 | ||
2936 | if (first_connection == nullptr) | |
2937 | first_connection = proc_target; | |
2938 | else if (first_connection != proc_target | |
2939 | && first_not_non_stop != nullptr) | |
2940 | { | |
2941 | switch_to_inferior_no_thread (first_not_non_stop); | |
2942 | ||
2943 | proc_target = current_inferior ()->process_target(); | |
2944 | ||
2945 | error (_("Connection %d (%s) does not support " | |
2946 | "multi-target resumption."), | |
2947 | proc_target->connection_number, | |
2948 | make_target_connection_string (proc_target).c_str ()); | |
2949 | } | |
2950 | } | |
2951 | } | |
2952 | } | |
2953 | ||
c906108c SS |
2954 | /* Basic routine for continuing the program in various fashions. |
2955 | ||
2956 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
2957 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
2958 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
2959 | |
2960 | You should call clear_proceed_status before calling proceed. */ | |
2961 | ||
2962 | void | |
64ce06e4 | 2963 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2964 | { |
e58b0e63 PA |
2965 | struct regcache *regcache; |
2966 | struct gdbarch *gdbarch; | |
e58b0e63 | 2967 | CORE_ADDR pc; |
4d9d9d04 PA |
2968 | struct execution_control_state ecss; |
2969 | struct execution_control_state *ecs = &ecss; | |
4d9d9d04 | 2970 | int started; |
c906108c | 2971 | |
e58b0e63 PA |
2972 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2973 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2974 | resuming the current thread. */ | |
2975 | if (!follow_fork ()) | |
2976 | { | |
2977 | /* The target for some reason decided not to resume. */ | |
2978 | normal_stop (); | |
f148b27e PA |
2979 | if (target_can_async_p ()) |
2980 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2981 | return; |
2982 | } | |
2983 | ||
842951eb PA |
2984 | /* We'll update this if & when we switch to a new thread. */ |
2985 | previous_inferior_ptid = inferior_ptid; | |
2986 | ||
e58b0e63 | 2987 | regcache = get_current_regcache (); |
ac7936df | 2988 | gdbarch = regcache->arch (); |
8b86c959 YQ |
2989 | const address_space *aspace = regcache->aspace (); |
2990 | ||
e58b0e63 | 2991 | pc = regcache_read_pc (regcache); |
08036331 | 2992 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 2993 | |
99619bea | 2994 | /* Fill in with reasonable starting values. */ |
08036331 | 2995 | init_thread_stepping_state (cur_thr); |
99619bea | 2996 | |
08036331 | 2997 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 2998 | |
5b6d1e4f PA |
2999 | ptid_t resume_ptid |
3000 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
3001 | process_stratum_target *resume_target | |
3002 | = user_visible_resume_target (resume_ptid); | |
3003 | ||
2f4fcf00 PA |
3004 | check_multi_target_resumption (resume_target); |
3005 | ||
2acceee2 | 3006 | if (addr == (CORE_ADDR) -1) |
c906108c | 3007 | { |
08036331 | 3008 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 3009 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 3010 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
3011 | /* There is a breakpoint at the address we will resume at, |
3012 | step one instruction before inserting breakpoints so that | |
3013 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
3014 | breakpoint). |
3015 | ||
3016 | Note, we don't do this in reverse, because we won't | |
3017 | actually be executing the breakpoint insn anyway. | |
3018 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 3019 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
3020 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3021 | && gdbarch_single_step_through_delay (gdbarch, | |
3022 | get_current_frame ())) | |
3352ef37 AC |
3023 | /* We stepped onto an instruction that needs to be stepped |
3024 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 3025 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
3026 | } |
3027 | else | |
3028 | { | |
515630c5 | 3029 | regcache_write_pc (regcache, addr); |
c906108c SS |
3030 | } |
3031 | ||
70509625 | 3032 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 3033 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 3034 | |
4d9d9d04 PA |
3035 | /* If an exception is thrown from this point on, make sure to |
3036 | propagate GDB's knowledge of the executing state to the | |
3037 | frontend/user running state. */ | |
5b6d1e4f | 3038 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
3039 | |
3040 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3041 | threads (e.g., we might need to set threads stepping over | |
3042 | breakpoints first), from the user/frontend's point of view, all | |
3043 | threads in RESUME_PTID are now running. Unless we're calling an | |
3044 | inferior function, as in that case we pretend the inferior | |
3045 | doesn't run at all. */ | |
08036331 | 3046 | if (!cur_thr->control.in_infcall) |
719546c4 | 3047 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3048 | |
527159b7 | 3049 | if (debug_infrun) |
8a9de0e4 | 3050 | fprintf_unfiltered (gdb_stdlog, |
64ce06e4 | 3051 | "infrun: proceed (addr=%s, signal=%s)\n", |
c9737c08 | 3052 | paddress (gdbarch, addr), |
64ce06e4 | 3053 | gdb_signal_to_symbol_string (siggnal)); |
527159b7 | 3054 | |
4d9d9d04 PA |
3055 | annotate_starting (); |
3056 | ||
3057 | /* Make sure that output from GDB appears before output from the | |
3058 | inferior. */ | |
3059 | gdb_flush (gdb_stdout); | |
3060 | ||
d930703d PA |
3061 | /* Since we've marked the inferior running, give it the terminal. A |
3062 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3063 | still detect attempts to unblock a stuck connection with repeated | |
3064 | Ctrl-C from within target_pass_ctrlc). */ | |
3065 | target_terminal::inferior (); | |
3066 | ||
4d9d9d04 PA |
3067 | /* In a multi-threaded task we may select another thread and |
3068 | then continue or step. | |
3069 | ||
3070 | But if a thread that we're resuming had stopped at a breakpoint, | |
3071 | it will immediately cause another breakpoint stop without any | |
3072 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3073 | we must step over it first. | |
3074 | ||
3075 | Look for threads other than the current (TP) that reported a | |
3076 | breakpoint hit and haven't been resumed yet since. */ | |
3077 | ||
3078 | /* If scheduler locking applies, we can avoid iterating over all | |
3079 | threads. */ | |
08036331 | 3080 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3081 | { |
5b6d1e4f PA |
3082 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3083 | resume_ptid)) | |
08036331 | 3084 | { |
f3f8ece4 PA |
3085 | switch_to_thread_no_regs (tp); |
3086 | ||
4d9d9d04 PA |
3087 | /* Ignore the current thread here. It's handled |
3088 | afterwards. */ | |
08036331 | 3089 | if (tp == cur_thr) |
4d9d9d04 | 3090 | continue; |
c906108c | 3091 | |
4d9d9d04 PA |
3092 | if (!thread_still_needs_step_over (tp)) |
3093 | continue; | |
3094 | ||
3095 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3096 | |
99619bea PA |
3097 | if (debug_infrun) |
3098 | fprintf_unfiltered (gdb_stdlog, | |
3099 | "infrun: need to step-over [%s] first\n", | |
a068643d | 3100 | target_pid_to_str (tp->ptid).c_str ()); |
99619bea | 3101 | |
4d9d9d04 | 3102 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3103 | } |
f3f8ece4 PA |
3104 | |
3105 | switch_to_thread (cur_thr); | |
30852783 UW |
3106 | } |
3107 | ||
4d9d9d04 PA |
3108 | /* Enqueue the current thread last, so that we move all other |
3109 | threads over their breakpoints first. */ | |
08036331 PA |
3110 | if (cur_thr->stepping_over_breakpoint) |
3111 | thread_step_over_chain_enqueue (cur_thr); | |
30852783 | 3112 | |
4d9d9d04 PA |
3113 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3114 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3115 | advanced. Must do this before resuming any thread, as in | |
3116 | all-stop/remote, once we resume we can't send any other packet | |
3117 | until the target stops again. */ | |
08036331 | 3118 | cur_thr->prev_pc = regcache_read_pc (regcache); |
99619bea | 3119 | |
a9bc57b9 TT |
3120 | { |
3121 | scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume (); | |
85ad3aaf | 3122 | |
a9bc57b9 | 3123 | started = start_step_over (); |
c906108c | 3124 | |
a9bc57b9 TT |
3125 | if (step_over_info_valid_p ()) |
3126 | { | |
3127 | /* Either this thread started a new in-line step over, or some | |
3128 | other thread was already doing one. In either case, don't | |
3129 | resume anything else until the step-over is finished. */ | |
3130 | } | |
3131 | else if (started && !target_is_non_stop_p ()) | |
3132 | { | |
3133 | /* A new displaced stepping sequence was started. In all-stop, | |
3134 | we can't talk to the target anymore until it next stops. */ | |
3135 | } | |
3136 | else if (!non_stop && target_is_non_stop_p ()) | |
3137 | { | |
3138 | /* In all-stop, but the target is always in non-stop mode. | |
3139 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3140 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3141 | resume_ptid)) | |
3142 | { | |
3143 | switch_to_thread_no_regs (tp); | |
3144 | ||
f9fac3c8 SM |
3145 | if (!tp->inf->has_execution ()) |
3146 | { | |
3147 | if (debug_infrun) | |
3148 | fprintf_unfiltered (gdb_stdlog, | |
3149 | "infrun: proceed: [%s] target has " | |
3150 | "no execution\n", | |
3151 | target_pid_to_str (tp->ptid).c_str ()); | |
3152 | continue; | |
3153 | } | |
f3f8ece4 | 3154 | |
f9fac3c8 SM |
3155 | if (tp->resumed) |
3156 | { | |
3157 | if (debug_infrun) | |
3158 | fprintf_unfiltered (gdb_stdlog, | |
3159 | "infrun: proceed: [%s] resumed\n", | |
3160 | target_pid_to_str (tp->ptid).c_str ()); | |
3161 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
3162 | continue; | |
3163 | } | |
fbea99ea | 3164 | |
f9fac3c8 SM |
3165 | if (thread_is_in_step_over_chain (tp)) |
3166 | { | |
3167 | if (debug_infrun) | |
3168 | fprintf_unfiltered (gdb_stdlog, | |
3169 | "infrun: proceed: [%s] needs step-over\n", | |
3170 | target_pid_to_str (tp->ptid).c_str ()); | |
3171 | continue; | |
3172 | } | |
fbea99ea | 3173 | |
f9fac3c8 SM |
3174 | if (debug_infrun) |
3175 | fprintf_unfiltered (gdb_stdlog, | |
3176 | "infrun: proceed: resuming %s\n", | |
3177 | target_pid_to_str (tp->ptid).c_str ()); | |
fbea99ea | 3178 | |
f9fac3c8 SM |
3179 | reset_ecs (ecs, tp); |
3180 | switch_to_thread (tp); | |
3181 | keep_going_pass_signal (ecs); | |
3182 | if (!ecs->wait_some_more) | |
3183 | error (_("Command aborted.")); | |
3184 | } | |
a9bc57b9 | 3185 | } |
08036331 | 3186 | else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3187 | { |
3188 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3189 | reset_ecs (ecs, cur_thr); |
3190 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3191 | keep_going_pass_signal (ecs); |
3192 | if (!ecs->wait_some_more) | |
3193 | error (_("Command aborted.")); | |
3194 | } | |
3195 | } | |
c906108c | 3196 | |
5b6d1e4f | 3197 | commit_resume_all_targets (); |
85ad3aaf | 3198 | |
731f534f | 3199 | finish_state.release (); |
c906108c | 3200 | |
873657b9 PA |
3201 | /* If we've switched threads above, switch back to the previously |
3202 | current thread. We don't want the user to see a different | |
3203 | selected thread. */ | |
3204 | switch_to_thread (cur_thr); | |
3205 | ||
0b333c5e PA |
3206 | /* Tell the event loop to wait for it to stop. If the target |
3207 | supports asynchronous execution, it'll do this from within | |
3208 | target_resume. */ | |
362646f5 | 3209 | if (!target_can_async_p ()) |
0b333c5e | 3210 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3211 | } |
c906108c SS |
3212 | \f |
3213 | ||
3214 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3215 | |
c906108c | 3216 | void |
8621d6a9 | 3217 | start_remote (int from_tty) |
c906108c | 3218 | { |
5b6d1e4f PA |
3219 | inferior *inf = current_inferior (); |
3220 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3221 | |
1777feb0 | 3222 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3223 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3224 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3225 | nothing is returned (instead of just blocking). Because of this, |
3226 | targets expecting an immediate response need to, internally, set | |
3227 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3228 | timeout. */ |
6426a772 JM |
3229 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3230 | differentiate to its caller what the state of the target is after | |
3231 | the initial open has been performed. Here we're assuming that | |
3232 | the target has stopped. It should be possible to eventually have | |
3233 | target_open() return to the caller an indication that the target | |
3234 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3235 | for an async run. */ |
5b6d1e4f | 3236 | wait_for_inferior (inf); |
8621d6a9 DJ |
3237 | |
3238 | /* Now that the inferior has stopped, do any bookkeeping like | |
3239 | loading shared libraries. We want to do this before normal_stop, | |
3240 | so that the displayed frame is up to date. */ | |
8b88a78e | 3241 | post_create_inferior (current_top_target (), from_tty); |
8621d6a9 | 3242 | |
6426a772 | 3243 | normal_stop (); |
c906108c SS |
3244 | } |
3245 | ||
3246 | /* Initialize static vars when a new inferior begins. */ | |
3247 | ||
3248 | void | |
96baa820 | 3249 | init_wait_for_inferior (void) |
c906108c SS |
3250 | { |
3251 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3252 | |
c906108c SS |
3253 | breakpoint_init_inferior (inf_starting); |
3254 | ||
70509625 | 3255 | clear_proceed_status (0); |
9f976b41 | 3256 | |
ab1ddbcf | 3257 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3258 | |
842951eb | 3259 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3260 | } |
237fc4c9 | 3261 | |
c906108c | 3262 | \f |
488f131b | 3263 | |
ec9499be | 3264 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3265 | |
568d6575 UW |
3266 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3267 | struct execution_control_state *ecs); | |
3268 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3269 | struct execution_control_state *ecs); | |
4f5d7f63 | 3270 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3271 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3272 | struct frame_info *); |
611c83ae | 3273 | |
bdc36728 | 3274 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3275 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3276 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3277 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3278 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3279 | |
252fbfc8 PA |
3280 | /* This function is attached as a "thread_stop_requested" observer. |
3281 | Cleanup local state that assumed the PTID was to be resumed, and | |
3282 | report the stop to the frontend. */ | |
3283 | ||
2c0b251b | 3284 | static void |
252fbfc8 PA |
3285 | infrun_thread_stop_requested (ptid_t ptid) |
3286 | { | |
5b6d1e4f PA |
3287 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3288 | ||
c65d6b55 PA |
3289 | /* PTID was requested to stop. If the thread was already stopped, |
3290 | but the user/frontend doesn't know about that yet (e.g., the | |
3291 | thread had been temporarily paused for some step-over), set up | |
3292 | for reporting the stop now. */ | |
5b6d1e4f | 3293 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3294 | { |
3295 | if (tp->state != THREAD_RUNNING) | |
3296 | continue; | |
3297 | if (tp->executing) | |
3298 | continue; | |
c65d6b55 | 3299 | |
08036331 PA |
3300 | /* Remove matching threads from the step-over queue, so |
3301 | start_step_over doesn't try to resume them | |
3302 | automatically. */ | |
3303 | if (thread_is_in_step_over_chain (tp)) | |
3304 | thread_step_over_chain_remove (tp); | |
c65d6b55 | 3305 | |
08036331 PA |
3306 | /* If the thread is stopped, but the user/frontend doesn't |
3307 | know about that yet, queue a pending event, as if the | |
3308 | thread had just stopped now. Unless the thread already had | |
3309 | a pending event. */ | |
3310 | if (!tp->suspend.waitstatus_pending_p) | |
3311 | { | |
3312 | tp->suspend.waitstatus_pending_p = 1; | |
3313 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3314 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3315 | } | |
c65d6b55 | 3316 | |
08036331 PA |
3317 | /* Clear the inline-frame state, since we're re-processing the |
3318 | stop. */ | |
5b6d1e4f | 3319 | clear_inline_frame_state (tp); |
c65d6b55 | 3320 | |
08036331 PA |
3321 | /* If this thread was paused because some other thread was |
3322 | doing an inline-step over, let that finish first. Once | |
3323 | that happens, we'll restart all threads and consume pending | |
3324 | stop events then. */ | |
3325 | if (step_over_info_valid_p ()) | |
3326 | continue; | |
3327 | ||
3328 | /* Otherwise we can process the (new) pending event now. Set | |
3329 | it so this pending event is considered by | |
3330 | do_target_wait. */ | |
719546c4 | 3331 | tp->resumed = true; |
08036331 | 3332 | } |
252fbfc8 PA |
3333 | } |
3334 | ||
a07daef3 PA |
3335 | static void |
3336 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3337 | { | |
5b6d1e4f PA |
3338 | if (target_last_proc_target == tp->inf->process_target () |
3339 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3340 | nullify_last_target_wait_ptid (); |
3341 | } | |
3342 | ||
0cbcdb96 PA |
3343 | /* Delete the step resume, single-step and longjmp/exception resume |
3344 | breakpoints of TP. */ | |
4e1c45ea | 3345 | |
0cbcdb96 PA |
3346 | static void |
3347 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3348 | { |
0cbcdb96 PA |
3349 | delete_step_resume_breakpoint (tp); |
3350 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3351 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3352 | } |
3353 | ||
0cbcdb96 PA |
3354 | /* If the target still has execution, call FUNC for each thread that |
3355 | just stopped. In all-stop, that's all the non-exited threads; in | |
3356 | non-stop, that's the current thread, only. */ | |
3357 | ||
3358 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3359 | (struct thread_info *tp); | |
4e1c45ea PA |
3360 | |
3361 | static void | |
0cbcdb96 | 3362 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3363 | { |
d7e15655 | 3364 | if (!target_has_execution || inferior_ptid == null_ptid) |
4e1c45ea PA |
3365 | return; |
3366 | ||
fbea99ea | 3367 | if (target_is_non_stop_p ()) |
4e1c45ea | 3368 | { |
0cbcdb96 PA |
3369 | /* If in non-stop mode, only the current thread stopped. */ |
3370 | func (inferior_thread ()); | |
4e1c45ea PA |
3371 | } |
3372 | else | |
0cbcdb96 | 3373 | { |
0cbcdb96 | 3374 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3375 | for (thread_info *tp : all_non_exited_threads ()) |
3376 | func (tp); | |
0cbcdb96 PA |
3377 | } |
3378 | } | |
3379 | ||
3380 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3381 | the threads that just stopped. */ | |
3382 | ||
3383 | static void | |
3384 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3385 | { | |
3386 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3387 | } |
3388 | ||
3389 | /* Delete the single-step breakpoints of the threads that just | |
3390 | stopped. */ | |
7c16b83e | 3391 | |
34b7e8a6 PA |
3392 | static void |
3393 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3394 | { | |
3395 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3396 | } |
3397 | ||
221e1a37 | 3398 | /* See infrun.h. */ |
223698f8 | 3399 | |
221e1a37 | 3400 | void |
223698f8 DE |
3401 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3402 | const struct target_waitstatus *ws) | |
3403 | { | |
23fdd69e | 3404 | std::string status_string = target_waitstatus_to_string (ws); |
d7e74731 | 3405 | string_file stb; |
223698f8 DE |
3406 | |
3407 | /* The text is split over several lines because it was getting too long. | |
3408 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3409 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3410 | is set. */ | |
3411 | ||
d7e74731 | 3412 | stb.printf ("infrun: target_wait (%d.%ld.%ld", |
e99b03dc | 3413 | waiton_ptid.pid (), |
e38504b3 | 3414 | waiton_ptid.lwp (), |
cc6bcb54 | 3415 | waiton_ptid.tid ()); |
e99b03dc | 3416 | if (waiton_ptid.pid () != -1) |
a068643d | 3417 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid).c_str ()); |
d7e74731 PA |
3418 | stb.printf (", status) =\n"); |
3419 | stb.printf ("infrun: %d.%ld.%ld [%s],\n", | |
e99b03dc | 3420 | result_ptid.pid (), |
e38504b3 | 3421 | result_ptid.lwp (), |
cc6bcb54 | 3422 | result_ptid.tid (), |
a068643d | 3423 | target_pid_to_str (result_ptid).c_str ()); |
23fdd69e | 3424 | stb.printf ("infrun: %s\n", status_string.c_str ()); |
223698f8 DE |
3425 | |
3426 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3427 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3428 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3429 | } |
3430 | ||
372316f1 PA |
3431 | /* Select a thread at random, out of those which are resumed and have |
3432 | had events. */ | |
3433 | ||
3434 | static struct thread_info * | |
5b6d1e4f | 3435 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3436 | { |
372316f1 | 3437 | int num_events = 0; |
08036331 | 3438 | |
5b6d1e4f | 3439 | auto has_event = [&] (thread_info *tp) |
08036331 | 3440 | { |
5b6d1e4f PA |
3441 | return (tp->ptid.matches (waiton_ptid) |
3442 | && tp->resumed | |
08036331 PA |
3443 | && tp->suspend.waitstatus_pending_p); |
3444 | }; | |
372316f1 PA |
3445 | |
3446 | /* First see how many events we have. Count only resumed threads | |
3447 | that have an event pending. */ | |
5b6d1e4f | 3448 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3449 | if (has_event (tp)) |
372316f1 PA |
3450 | num_events++; |
3451 | ||
3452 | if (num_events == 0) | |
3453 | return NULL; | |
3454 | ||
3455 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3456 | int random_selector = (int) ((num_events * (double) rand ()) |
3457 | / (RAND_MAX + 1.0)); | |
372316f1 PA |
3458 | |
3459 | if (debug_infrun && num_events > 1) | |
3460 | fprintf_unfiltered (gdb_stdlog, | |
3461 | "infrun: Found %d events, selecting #%d\n", | |
3462 | num_events, random_selector); | |
3463 | ||
3464 | /* Select the Nth thread that has had an event. */ | |
5b6d1e4f | 3465 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3466 | if (has_event (tp)) |
372316f1 | 3467 | if (random_selector-- == 0) |
08036331 | 3468 | return tp; |
372316f1 | 3469 | |
08036331 | 3470 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3471 | } |
3472 | ||
3473 | /* Wrapper for target_wait that first checks whether threads have | |
3474 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3475 | more events. INF is the inferior we're using to call target_wait |
3476 | on. */ | |
372316f1 PA |
3477 | |
3478 | static ptid_t | |
5b6d1e4f PA |
3479 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
3480 | target_waitstatus *status, int options) | |
372316f1 PA |
3481 | { |
3482 | ptid_t event_ptid; | |
3483 | struct thread_info *tp; | |
3484 | ||
24ed6739 AB |
3485 | /* We know that we are looking for an event in the target of inferior |
3486 | INF, but we don't know which thread the event might come from. As | |
3487 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3488 | the wait code relies on it - doing so is always a mistake. */ | |
3489 | switch_to_inferior_no_thread (inf); | |
3490 | ||
372316f1 PA |
3491 | /* First check if there is a resumed thread with a wait status |
3492 | pending. */ | |
d7e15655 | 3493 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3494 | { |
5b6d1e4f | 3495 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3496 | } |
3497 | else | |
3498 | { | |
3499 | if (debug_infrun) | |
3500 | fprintf_unfiltered (gdb_stdlog, | |
3501 | "infrun: Waiting for specific thread %s.\n", | |
a068643d | 3502 | target_pid_to_str (ptid).c_str ()); |
372316f1 PA |
3503 | |
3504 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3505 | tp = find_thread_ptid (inf, ptid); |
372316f1 PA |
3506 | gdb_assert (tp != NULL); |
3507 | if (!tp->suspend.waitstatus_pending_p) | |
3508 | tp = NULL; | |
3509 | } | |
3510 | ||
3511 | if (tp != NULL | |
3512 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3513 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3514 | { | |
00431a78 | 3515 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3516 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3517 | CORE_ADDR pc; |
3518 | int discard = 0; | |
3519 | ||
3520 | pc = regcache_read_pc (regcache); | |
3521 | ||
3522 | if (pc != tp->suspend.stop_pc) | |
3523 | { | |
3524 | if (debug_infrun) | |
3525 | fprintf_unfiltered (gdb_stdlog, | |
3526 | "infrun: PC of %s changed. was=%s, now=%s\n", | |
a068643d | 3527 | target_pid_to_str (tp->ptid).c_str (), |
defd2172 | 3528 | paddress (gdbarch, tp->suspend.stop_pc), |
372316f1 PA |
3529 | paddress (gdbarch, pc)); |
3530 | discard = 1; | |
3531 | } | |
a01bda52 | 3532 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 PA |
3533 | { |
3534 | if (debug_infrun) | |
3535 | fprintf_unfiltered (gdb_stdlog, | |
3536 | "infrun: previous breakpoint of %s, at %s gone\n", | |
a068643d | 3537 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
3538 | paddress (gdbarch, pc)); |
3539 | ||
3540 | discard = 1; | |
3541 | } | |
3542 | ||
3543 | if (discard) | |
3544 | { | |
3545 | if (debug_infrun) | |
3546 | fprintf_unfiltered (gdb_stdlog, | |
3547 | "infrun: pending event of %s cancelled.\n", | |
a068643d | 3548 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
3549 | |
3550 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3551 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3552 | } | |
3553 | } | |
3554 | ||
3555 | if (tp != NULL) | |
3556 | { | |
3557 | if (debug_infrun) | |
3558 | { | |
23fdd69e SM |
3559 | std::string statstr |
3560 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 3561 | |
372316f1 PA |
3562 | fprintf_unfiltered (gdb_stdlog, |
3563 | "infrun: Using pending wait status %s for %s.\n", | |
23fdd69e | 3564 | statstr.c_str (), |
a068643d | 3565 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
3566 | } |
3567 | ||
3568 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3569 | if it was a software breakpoint (and the target doesn't | |
3570 | always adjust the PC itself). */ | |
3571 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3572 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3573 | { | |
3574 | struct regcache *regcache; | |
3575 | struct gdbarch *gdbarch; | |
3576 | int decr_pc; | |
3577 | ||
00431a78 | 3578 | regcache = get_thread_regcache (tp); |
ac7936df | 3579 | gdbarch = regcache->arch (); |
372316f1 PA |
3580 | |
3581 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3582 | if (decr_pc != 0) | |
3583 | { | |
3584 | CORE_ADDR pc; | |
3585 | ||
3586 | pc = regcache_read_pc (regcache); | |
3587 | regcache_write_pc (regcache, pc + decr_pc); | |
3588 | } | |
3589 | } | |
3590 | ||
3591 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3592 | *status = tp->suspend.waitstatus; | |
3593 | tp->suspend.waitstatus_pending_p = 0; | |
3594 | ||
3595 | /* Wake up the event loop again, until all pending events are | |
3596 | processed. */ | |
3597 | if (target_is_async_p ()) | |
3598 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3599 | return tp->ptid; | |
3600 | } | |
3601 | ||
3602 | /* But if we don't find one, we'll have to wait. */ | |
3603 | ||
3604 | if (deprecated_target_wait_hook) | |
3605 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3606 | else | |
3607 | event_ptid = target_wait (ptid, status, options); | |
3608 | ||
3609 | return event_ptid; | |
3610 | } | |
3611 | ||
5b6d1e4f PA |
3612 | /* Returns true if INF has any resumed thread with a status |
3613 | pending. */ | |
3614 | ||
3615 | static bool | |
3616 | threads_are_resumed_pending_p (inferior *inf) | |
3617 | { | |
3618 | for (thread_info *tp : inf->non_exited_threads ()) | |
3619 | if (tp->resumed | |
3620 | && tp->suspend.waitstatus_pending_p) | |
3621 | return true; | |
3622 | ||
3623 | return false; | |
3624 | } | |
3625 | ||
3626 | /* Wrapper for target_wait that first checks whether threads have | |
3627 | pending statuses to report before actually asking the target for | |
3628 | more events. Polls for events from all inferiors/targets. */ | |
3629 | ||
3630 | static bool | |
3631 | do_target_wait (ptid_t wait_ptid, execution_control_state *ecs, int options) | |
3632 | { | |
3633 | int num_inferiors = 0; | |
3634 | int random_selector; | |
3635 | ||
3636 | /* For fairness, we pick the first inferior/target to poll at | |
3637 | random, and then continue polling the rest of the inferior list | |
3638 | starting from that one in a circular fashion until the whole list | |
3639 | is polled once. */ | |
3640 | ||
3641 | auto inferior_matches = [&wait_ptid] (inferior *inf) | |
3642 | { | |
3643 | return (inf->process_target () != NULL | |
3644 | && (threads_are_executing (inf->process_target ()) | |
3645 | || threads_are_resumed_pending_p (inf)) | |
3646 | && ptid_t (inf->pid).matches (wait_ptid)); | |
3647 | }; | |
3648 | ||
3649 | /* First see how many resumed inferiors we have. */ | |
3650 | for (inferior *inf : all_inferiors ()) | |
3651 | if (inferior_matches (inf)) | |
3652 | num_inferiors++; | |
3653 | ||
3654 | if (num_inferiors == 0) | |
3655 | { | |
3656 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3657 | return false; | |
3658 | } | |
3659 | ||
3660 | /* Now randomly pick an inferior out of those that were resumed. */ | |
3661 | random_selector = (int) | |
3662 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3663 | ||
3664 | if (debug_infrun && num_inferiors > 1) | |
3665 | fprintf_unfiltered (gdb_stdlog, | |
3666 | "infrun: Found %d inferiors, starting at #%d\n", | |
3667 | num_inferiors, random_selector); | |
3668 | ||
3669 | /* Select the Nth inferior that was resumed. */ | |
3670 | ||
3671 | inferior *selected = nullptr; | |
3672 | ||
3673 | for (inferior *inf : all_inferiors ()) | |
3674 | if (inferior_matches (inf)) | |
3675 | if (random_selector-- == 0) | |
3676 | { | |
3677 | selected = inf; | |
3678 | break; | |
3679 | } | |
3680 | ||
3681 | /* Now poll for events out of each of the resumed inferior's | |
3682 | targets, starting from the selected one. */ | |
3683 | ||
3684 | auto do_wait = [&] (inferior *inf) | |
3685 | { | |
5b6d1e4f PA |
3686 | ecs->ptid = do_target_wait_1 (inf, wait_ptid, &ecs->ws, options); |
3687 | ecs->target = inf->process_target (); | |
3688 | return (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3689 | }; | |
3690 | ||
3691 | /* Needed in all-stop+target-non-stop mode, because we end up here | |
3692 | spuriously after the target is all stopped and we've already | |
3693 | reported the stop to the user, polling for events. */ | |
3694 | scoped_restore_current_thread restore_thread; | |
3695 | ||
3696 | int inf_num = selected->num; | |
3697 | for (inferior *inf = selected; inf != NULL; inf = inf->next) | |
3698 | if (inferior_matches (inf)) | |
3699 | if (do_wait (inf)) | |
3700 | return true; | |
3701 | ||
3702 | for (inferior *inf = inferior_list; | |
3703 | inf != NULL && inf->num < inf_num; | |
3704 | inf = inf->next) | |
3705 | if (inferior_matches (inf)) | |
3706 | if (do_wait (inf)) | |
3707 | return true; | |
3708 | ||
3709 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3710 | return false; | |
3711 | } | |
3712 | ||
24291992 PA |
3713 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3714 | detaching while a thread is displaced stepping is a recipe for | |
3715 | crashing it, as nothing would readjust the PC out of the scratch | |
3716 | pad. */ | |
3717 | ||
3718 | void | |
3719 | prepare_for_detach (void) | |
3720 | { | |
3721 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3722 | ptid_t pid_ptid = ptid_t (inf->pid); |
24291992 | 3723 | |
00431a78 | 3724 | displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf); |
24291992 PA |
3725 | |
3726 | /* Is any thread of this process displaced stepping? If not, | |
3727 | there's nothing else to do. */ | |
d20172fc | 3728 | if (displaced->step_thread == nullptr) |
24291992 PA |
3729 | return; |
3730 | ||
3731 | if (debug_infrun) | |
3732 | fprintf_unfiltered (gdb_stdlog, | |
3733 | "displaced-stepping in-process while detaching"); | |
3734 | ||
9bcb1f16 | 3735 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3736 | |
00431a78 | 3737 | while (displaced->step_thread != nullptr) |
24291992 | 3738 | { |
24291992 PA |
3739 | struct execution_control_state ecss; |
3740 | struct execution_control_state *ecs; | |
3741 | ||
3742 | ecs = &ecss; | |
3743 | memset (ecs, 0, sizeof (*ecs)); | |
3744 | ||
3745 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3746 | /* Flush target cache before starting to handle each event. |
3747 | Target was running and cache could be stale. This is just a | |
3748 | heuristic. Running threads may modify target memory, but we | |
3749 | don't get any event. */ | |
3750 | target_dcache_invalidate (); | |
24291992 | 3751 | |
5b6d1e4f | 3752 | do_target_wait (pid_ptid, ecs, 0); |
24291992 PA |
3753 | |
3754 | if (debug_infrun) | |
3755 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3756 | ||
3757 | /* If an error happens while handling the event, propagate GDB's | |
3758 | knowledge of the executing state to the frontend/user running | |
3759 | state. */ | |
5b6d1e4f PA |
3760 | scoped_finish_thread_state finish_state (inf->process_target (), |
3761 | minus_one_ptid); | |
24291992 PA |
3762 | |
3763 | /* Now figure out what to do with the result of the result. */ | |
3764 | handle_inferior_event (ecs); | |
3765 | ||
3766 | /* No error, don't finish the state yet. */ | |
731f534f | 3767 | finish_state.release (); |
24291992 PA |
3768 | |
3769 | /* Breakpoints and watchpoints are not installed on the target | |
3770 | at this point, and signals are passed directly to the | |
3771 | inferior, so this must mean the process is gone. */ | |
3772 | if (!ecs->wait_some_more) | |
3773 | { | |
9bcb1f16 | 3774 | restore_detaching.release (); |
24291992 PA |
3775 | error (_("Program exited while detaching")); |
3776 | } | |
3777 | } | |
3778 | ||
9bcb1f16 | 3779 | restore_detaching.release (); |
24291992 PA |
3780 | } |
3781 | ||
cd0fc7c3 | 3782 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3783 | |
cd0fc7c3 SS |
3784 | If inferior gets a signal, we may decide to start it up again |
3785 | instead of returning. That is why there is a loop in this function. | |
3786 | When this function actually returns it means the inferior | |
3787 | should be left stopped and GDB should read more commands. */ | |
3788 | ||
5b6d1e4f PA |
3789 | static void |
3790 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3791 | { |
527159b7 | 3792 | if (debug_infrun) |
ae123ec6 | 3793 | fprintf_unfiltered |
e4c8541f | 3794 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3795 | |
4c41382a | 3796 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3797 | |
e6f5c25b PA |
3798 | /* If an error happens while handling the event, propagate GDB's |
3799 | knowledge of the executing state to the frontend/user running | |
3800 | state. */ | |
5b6d1e4f PA |
3801 | scoped_finish_thread_state finish_state |
3802 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 3803 | |
c906108c SS |
3804 | while (1) |
3805 | { | |
ae25568b PA |
3806 | struct execution_control_state ecss; |
3807 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 3808 | |
ae25568b PA |
3809 | memset (ecs, 0, sizeof (*ecs)); |
3810 | ||
ec9499be | 3811 | overlay_cache_invalid = 1; |
ec9499be | 3812 | |
f15cb84a YQ |
3813 | /* Flush target cache before starting to handle each event. |
3814 | Target was running and cache could be stale. This is just a | |
3815 | heuristic. Running threads may modify target memory, but we | |
3816 | don't get any event. */ | |
3817 | target_dcache_invalidate (); | |
3818 | ||
5b6d1e4f PA |
3819 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
3820 | ecs->target = inf->process_target (); | |
c906108c | 3821 | |
f00150c9 | 3822 | if (debug_infrun) |
5b6d1e4f | 3823 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3824 | |
cd0fc7c3 SS |
3825 | /* Now figure out what to do with the result of the result. */ |
3826 | handle_inferior_event (ecs); | |
c906108c | 3827 | |
cd0fc7c3 SS |
3828 | if (!ecs->wait_some_more) |
3829 | break; | |
3830 | } | |
4e1c45ea | 3831 | |
e6f5c25b | 3832 | /* No error, don't finish the state yet. */ |
731f534f | 3833 | finish_state.release (); |
cd0fc7c3 | 3834 | } |
c906108c | 3835 | |
d3d4baed PA |
3836 | /* Cleanup that reinstalls the readline callback handler, if the |
3837 | target is running in the background. If while handling the target | |
3838 | event something triggered a secondary prompt, like e.g., a | |
3839 | pagination prompt, we'll have removed the callback handler (see | |
3840 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3841 | event loop, ready to process further input. Note this has no | |
3842 | effect if the handler hasn't actually been removed, because calling | |
3843 | rl_callback_handler_install resets the line buffer, thus losing | |
3844 | input. */ | |
3845 | ||
3846 | static void | |
d238133d | 3847 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 3848 | { |
3b12939d PA |
3849 | struct ui *ui = current_ui; |
3850 | ||
3851 | if (!ui->async) | |
6c400b59 PA |
3852 | { |
3853 | /* We're not going back to the top level event loop yet. Don't | |
3854 | install the readline callback, as it'd prep the terminal, | |
3855 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3856 | it the next time the prompt is displayed, when we're ready | |
3857 | for input. */ | |
3858 | return; | |
3859 | } | |
3860 | ||
3b12939d | 3861 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3862 | gdb_rl_callback_handler_reinstall (); |
3863 | } | |
3864 | ||
243a9253 PA |
3865 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3866 | that's just the event thread. In all-stop, that's all threads. */ | |
3867 | ||
3868 | static void | |
3869 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3870 | { | |
08036331 PA |
3871 | if (ecs->event_thread != NULL |
3872 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 3873 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
3874 | |
3875 | if (!non_stop) | |
3876 | { | |
08036331 | 3877 | for (thread_info *thr : all_non_exited_threads ()) |
243a9253 PA |
3878 | { |
3879 | if (thr->thread_fsm == NULL) | |
3880 | continue; | |
3881 | if (thr == ecs->event_thread) | |
3882 | continue; | |
3883 | ||
00431a78 | 3884 | switch_to_thread (thr); |
46e3ed7f | 3885 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
3886 | } |
3887 | ||
3888 | if (ecs->event_thread != NULL) | |
00431a78 | 3889 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3890 | } |
3891 | } | |
3892 | ||
3b12939d PA |
3893 | /* Helper for all_uis_check_sync_execution_done that works on the |
3894 | current UI. */ | |
3895 | ||
3896 | static void | |
3897 | check_curr_ui_sync_execution_done (void) | |
3898 | { | |
3899 | struct ui *ui = current_ui; | |
3900 | ||
3901 | if (ui->prompt_state == PROMPT_NEEDED | |
3902 | && ui->async | |
3903 | && !gdb_in_secondary_prompt_p (ui)) | |
3904 | { | |
223ffa71 | 3905 | target_terminal::ours (); |
76727919 | 3906 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3907 | ui_register_input_event_handler (ui); |
3b12939d PA |
3908 | } |
3909 | } | |
3910 | ||
3911 | /* See infrun.h. */ | |
3912 | ||
3913 | void | |
3914 | all_uis_check_sync_execution_done (void) | |
3915 | { | |
0e454242 | 3916 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3917 | { |
3918 | check_curr_ui_sync_execution_done (); | |
3919 | } | |
3920 | } | |
3921 | ||
a8836c93 PA |
3922 | /* See infrun.h. */ |
3923 | ||
3924 | void | |
3925 | all_uis_on_sync_execution_starting (void) | |
3926 | { | |
0e454242 | 3927 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3928 | { |
3929 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3930 | async_disable_stdin (); | |
3931 | } | |
3932 | } | |
3933 | ||
1777feb0 | 3934 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3935 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3936 | descriptor corresponding to the target. It can be called more than |
3937 | once to complete a single execution command. In such cases we need | |
3938 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3939 | that this function is called for a single execution command, then |
3940 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3941 | necessary cleanups. */ |
43ff13b4 JM |
3942 | |
3943 | void | |
fba45db2 | 3944 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3945 | { |
0d1e5fa7 | 3946 | struct execution_control_state ecss; |
a474d7c2 | 3947 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 3948 | int cmd_done = 0; |
43ff13b4 | 3949 | |
0d1e5fa7 PA |
3950 | memset (ecs, 0, sizeof (*ecs)); |
3951 | ||
c61db772 PA |
3952 | /* Events are always processed with the main UI as current UI. This |
3953 | way, warnings, debug output, etc. are always consistently sent to | |
3954 | the main console. */ | |
4b6749b9 | 3955 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3956 | |
d3d4baed | 3957 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
3958 | { |
3959 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
3960 | ||
3961 | /* We're handling a live event, so make sure we're doing live | |
3962 | debugging. If we're looking at traceframes while the target is | |
3963 | running, we're going to need to get back to that mode after | |
3964 | handling the event. */ | |
3965 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
3966 | if (non_stop) | |
3967 | { | |
3968 | maybe_restore_traceframe.emplace (); | |
3969 | set_current_traceframe (-1); | |
3970 | } | |
43ff13b4 | 3971 | |
873657b9 PA |
3972 | /* The user/frontend should not notice a thread switch due to |
3973 | internal events. Make sure we revert to the user selected | |
3974 | thread and frame after handling the event and running any | |
3975 | breakpoint commands. */ | |
3976 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
3977 | |
3978 | overlay_cache_invalid = 1; | |
3979 | /* Flush target cache before starting to handle each event. Target | |
3980 | was running and cache could be stale. This is just a heuristic. | |
3981 | Running threads may modify target memory, but we don't get any | |
3982 | event. */ | |
3983 | target_dcache_invalidate (); | |
3984 | ||
3985 | scoped_restore save_exec_dir | |
3986 | = make_scoped_restore (&execution_direction, | |
3987 | target_execution_direction ()); | |
3988 | ||
5b6d1e4f PA |
3989 | if (!do_target_wait (minus_one_ptid, ecs, TARGET_WNOHANG)) |
3990 | return; | |
3991 | ||
3992 | gdb_assert (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3993 | ||
3994 | /* Switch to the target that generated the event, so we can do | |
3995 | target calls. Any inferior bound to the target will do, so we | |
3996 | just switch to the first we find. */ | |
3997 | for (inferior *inf : all_inferiors (ecs->target)) | |
3998 | { | |
3999 | switch_to_inferior_no_thread (inf); | |
4000 | break; | |
4001 | } | |
d238133d TT |
4002 | |
4003 | if (debug_infrun) | |
5b6d1e4f | 4004 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
d238133d TT |
4005 | |
4006 | /* If an error happens while handling the event, propagate GDB's | |
4007 | knowledge of the executing state to the frontend/user running | |
4008 | state. */ | |
4009 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 4010 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 4011 | |
979a0d13 | 4012 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
4013 | still for the thread which has thrown the exception. */ |
4014 | auto defer_bpstat_clear | |
4015 | = make_scope_exit (bpstat_clear_actions); | |
4016 | auto defer_delete_threads | |
4017 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
4018 | ||
4019 | /* Now figure out what to do with the result of the result. */ | |
4020 | handle_inferior_event (ecs); | |
4021 | ||
4022 | if (!ecs->wait_some_more) | |
4023 | { | |
5b6d1e4f | 4024 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
d238133d TT |
4025 | int should_stop = 1; |
4026 | struct thread_info *thr = ecs->event_thread; | |
d6b48e9c | 4027 | |
d238133d | 4028 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 4029 | |
d238133d TT |
4030 | if (thr != NULL) |
4031 | { | |
4032 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 4033 | |
d238133d | 4034 | if (thread_fsm != NULL) |
46e3ed7f | 4035 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 4036 | } |
243a9253 | 4037 | |
d238133d TT |
4038 | if (!should_stop) |
4039 | { | |
4040 | keep_going (ecs); | |
4041 | } | |
4042 | else | |
4043 | { | |
46e3ed7f | 4044 | bool should_notify_stop = true; |
d238133d | 4045 | int proceeded = 0; |
1840d81a | 4046 | |
d238133d | 4047 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 4048 | |
d238133d | 4049 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 4050 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 4051 | |
d238133d TT |
4052 | if (should_notify_stop) |
4053 | { | |
4054 | /* We may not find an inferior if this was a process exit. */ | |
4055 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
4056 | proceeded = normal_stop (); | |
4057 | } | |
243a9253 | 4058 | |
d238133d TT |
4059 | if (!proceeded) |
4060 | { | |
4061 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
4062 | cmd_done = 1; | |
4063 | } | |
873657b9 PA |
4064 | |
4065 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
4066 | previously selected thread is gone. We have two | |
4067 | choices - switch to no thread selected, or restore the | |
4068 | previously selected thread (now exited). We chose the | |
4069 | later, just because that's what GDB used to do. After | |
4070 | this, "info threads" says "The current thread <Thread | |
4071 | ID 2> has terminated." instead of "No thread | |
4072 | selected.". */ | |
4073 | if (!non_stop | |
4074 | && cmd_done | |
4075 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
4076 | restore_thread.dont_restore (); | |
d238133d TT |
4077 | } |
4078 | } | |
4f8d22e3 | 4079 | |
d238133d TT |
4080 | defer_delete_threads.release (); |
4081 | defer_bpstat_clear.release (); | |
29f49a6a | 4082 | |
d238133d TT |
4083 | /* No error, don't finish the thread states yet. */ |
4084 | finish_state.release (); | |
731f534f | 4085 | |
d238133d TT |
4086 | /* This scope is used to ensure that readline callbacks are |
4087 | reinstalled here. */ | |
4088 | } | |
4f8d22e3 | 4089 | |
3b12939d PA |
4090 | /* If a UI was in sync execution mode, and now isn't, restore its |
4091 | prompt (a synchronous execution command has finished, and we're | |
4092 | ready for input). */ | |
4093 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4094 | |
4095 | if (cmd_done | |
0f641c01 | 4096 | && exec_done_display_p |
00431a78 PA |
4097 | && (inferior_ptid == null_ptid |
4098 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 4099 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
4100 | } |
4101 | ||
29734269 SM |
4102 | /* See infrun.h. */ |
4103 | ||
edb3359d | 4104 | void |
29734269 SM |
4105 | set_step_info (thread_info *tp, struct frame_info *frame, |
4106 | struct symtab_and_line sal) | |
edb3359d | 4107 | { |
29734269 SM |
4108 | /* This can be removed once this function no longer implicitly relies on the |
4109 | inferior_ptid value. */ | |
4110 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4111 | |
16c381f0 JK |
4112 | tp->control.step_frame_id = get_frame_id (frame); |
4113 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4114 | |
4115 | tp->current_symtab = sal.symtab; | |
4116 | tp->current_line = sal.line; | |
4117 | } | |
4118 | ||
0d1e5fa7 PA |
4119 | /* Clear context switchable stepping state. */ |
4120 | ||
4121 | void | |
4e1c45ea | 4122 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4123 | { |
7f5ef605 | 4124 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4125 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4126 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4127 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4128 | } |
4129 | ||
ab1ddbcf | 4130 | /* See infrun.h. */ |
c32c64b7 | 4131 | |
6efcd9a8 | 4132 | void |
5b6d1e4f PA |
4133 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
4134 | target_waitstatus status) | |
c32c64b7 | 4135 | { |
5b6d1e4f | 4136 | target_last_proc_target = target; |
c32c64b7 DE |
4137 | target_last_wait_ptid = ptid; |
4138 | target_last_waitstatus = status; | |
4139 | } | |
4140 | ||
ab1ddbcf | 4141 | /* See infrun.h. */ |
e02bc4cc DS |
4142 | |
4143 | void | |
5b6d1e4f PA |
4144 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4145 | target_waitstatus *status) | |
e02bc4cc | 4146 | { |
5b6d1e4f PA |
4147 | if (target != nullptr) |
4148 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4149 | if (ptid != nullptr) |
4150 | *ptid = target_last_wait_ptid; | |
4151 | if (status != nullptr) | |
4152 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4153 | } |
4154 | ||
ab1ddbcf PA |
4155 | /* See infrun.h. */ |
4156 | ||
ac264b3b MS |
4157 | void |
4158 | nullify_last_target_wait_ptid (void) | |
4159 | { | |
5b6d1e4f | 4160 | target_last_proc_target = nullptr; |
ac264b3b | 4161 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4162 | target_last_waitstatus = {}; |
ac264b3b MS |
4163 | } |
4164 | ||
dcf4fbde | 4165 | /* Switch thread contexts. */ |
dd80620e MS |
4166 | |
4167 | static void | |
00431a78 | 4168 | context_switch (execution_control_state *ecs) |
dd80620e | 4169 | { |
00431a78 PA |
4170 | if (debug_infrun |
4171 | && ecs->ptid != inferior_ptid | |
5b6d1e4f PA |
4172 | && (inferior_ptid == null_ptid |
4173 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 DJ |
4174 | { |
4175 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
a068643d | 4176 | target_pid_to_str (inferior_ptid).c_str ()); |
fd48f117 | 4177 | fprintf_unfiltered (gdb_stdlog, "to %s\n", |
a068643d | 4178 | target_pid_to_str (ecs->ptid).c_str ()); |
fd48f117 DJ |
4179 | } |
4180 | ||
00431a78 | 4181 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4182 | } |
4183 | ||
d8dd4d5f PA |
4184 | /* If the target can't tell whether we've hit breakpoints |
4185 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4186 | check whether that could have been caused by a breakpoint. If so, | |
4187 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4188 | ||
4fa8626c | 4189 | static void |
d8dd4d5f PA |
4190 | adjust_pc_after_break (struct thread_info *thread, |
4191 | struct target_waitstatus *ws) | |
4fa8626c | 4192 | { |
24a73cce UW |
4193 | struct regcache *regcache; |
4194 | struct gdbarch *gdbarch; | |
118e6252 | 4195 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4196 | |
4fa8626c DJ |
4197 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4198 | we aren't, just return. | |
9709f61c DJ |
4199 | |
4200 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4201 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4202 | implemented by software breakpoints should be handled through the normal | |
4203 | breakpoint layer. | |
8fb3e588 | 4204 | |
4fa8626c DJ |
4205 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4206 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4207 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4208 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4209 | generates these signals at breakpoints (the code has been in GDB since at | |
4210 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4211 | |
e6cf7916 UW |
4212 | In earlier versions of GDB, a target with |
4213 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4214 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4215 | target with both of these set in GDB history, and it seems unlikely to be | |
4216 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4217 | |
d8dd4d5f | 4218 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4219 | return; |
4220 | ||
d8dd4d5f | 4221 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4222 | return; |
4223 | ||
4058b839 PA |
4224 | /* In reverse execution, when a breakpoint is hit, the instruction |
4225 | under it has already been de-executed. The reported PC always | |
4226 | points at the breakpoint address, so adjusting it further would | |
4227 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4228 | architecture: | |
4229 | ||
4230 | B1 0x08000000 : INSN1 | |
4231 | B2 0x08000001 : INSN2 | |
4232 | 0x08000002 : INSN3 | |
4233 | PC -> 0x08000003 : INSN4 | |
4234 | ||
4235 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4236 | from that point should hit B2 as below. Reading the PC when the | |
4237 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4238 | been de-executed already. | |
4239 | ||
4240 | B1 0x08000000 : INSN1 | |
4241 | B2 PC -> 0x08000001 : INSN2 | |
4242 | 0x08000002 : INSN3 | |
4243 | 0x08000003 : INSN4 | |
4244 | ||
4245 | We can't apply the same logic as for forward execution, because | |
4246 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4247 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4248 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4249 | behaviour. */ | |
4250 | if (execution_direction == EXEC_REVERSE) | |
4251 | return; | |
4252 | ||
1cf4d951 PA |
4253 | /* If the target can tell whether the thread hit a SW breakpoint, |
4254 | trust it. Targets that can tell also adjust the PC | |
4255 | themselves. */ | |
4256 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4257 | return; | |
4258 | ||
4259 | /* Note that relying on whether a breakpoint is planted in memory to | |
4260 | determine this can fail. E.g,. the breakpoint could have been | |
4261 | removed since. Or the thread could have been told to step an | |
4262 | instruction the size of a breakpoint instruction, and only | |
4263 | _after_ was a breakpoint inserted at its address. */ | |
4264 | ||
24a73cce UW |
4265 | /* If this target does not decrement the PC after breakpoints, then |
4266 | we have nothing to do. */ | |
00431a78 | 4267 | regcache = get_thread_regcache (thread); |
ac7936df | 4268 | gdbarch = regcache->arch (); |
118e6252 | 4269 | |
527a273a | 4270 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4271 | if (decr_pc == 0) |
24a73cce UW |
4272 | return; |
4273 | ||
8b86c959 | 4274 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4275 | |
8aad930b AC |
4276 | /* Find the location where (if we've hit a breakpoint) the |
4277 | breakpoint would be. */ | |
118e6252 | 4278 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4279 | |
1cf4d951 PA |
4280 | /* If the target can't tell whether a software breakpoint triggered, |
4281 | fallback to figuring it out based on breakpoints we think were | |
4282 | inserted in the target, and on whether the thread was stepped or | |
4283 | continued. */ | |
4284 | ||
1c5cfe86 PA |
4285 | /* Check whether there actually is a software breakpoint inserted at |
4286 | that location. | |
4287 | ||
4288 | If in non-stop mode, a race condition is possible where we've | |
4289 | removed a breakpoint, but stop events for that breakpoint were | |
4290 | already queued and arrive later. To suppress those spurious | |
4291 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4292 | and retire them after a number of stop events are reported. Note |
4293 | this is an heuristic and can thus get confused. The real fix is | |
4294 | to get the "stopped by SW BP and needs adjustment" info out of | |
4295 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4296 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4297 | || (target_is_non_stop_p () |
4298 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4299 | { |
07036511 | 4300 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4301 | |
8213266a | 4302 | if (record_full_is_used ()) |
07036511 TT |
4303 | restore_operation_disable.emplace |
4304 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4305 | |
1c0fdd0e UW |
4306 | /* When using hardware single-step, a SIGTRAP is reported for both |
4307 | a completed single-step and a software breakpoint. Need to | |
4308 | differentiate between the two, as the latter needs adjusting | |
4309 | but the former does not. | |
4310 | ||
4311 | The SIGTRAP can be due to a completed hardware single-step only if | |
4312 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4313 | - this thread is currently being stepped |
4314 | ||
4315 | If any of these events did not occur, we must have stopped due | |
4316 | to hitting a software breakpoint, and have to back up to the | |
4317 | breakpoint address. | |
4318 | ||
4319 | As a special case, we could have hardware single-stepped a | |
4320 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4321 | we also need to back up to the breakpoint address. */ | |
4322 | ||
d8dd4d5f PA |
4323 | if (thread_has_single_step_breakpoints_set (thread) |
4324 | || !currently_stepping (thread) | |
4325 | || (thread->stepped_breakpoint | |
4326 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4327 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4328 | } |
4fa8626c DJ |
4329 | } |
4330 | ||
edb3359d DJ |
4331 | static int |
4332 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4333 | { | |
4334 | for (frame = get_prev_frame (frame); | |
4335 | frame != NULL; | |
4336 | frame = get_prev_frame (frame)) | |
4337 | { | |
4338 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4339 | return 1; | |
4340 | if (get_frame_type (frame) != INLINE_FRAME) | |
4341 | break; | |
4342 | } | |
4343 | ||
4344 | return 0; | |
4345 | } | |
4346 | ||
4a4c04f1 BE |
4347 | /* Look for an inline frame that is marked for skip. |
4348 | If PREV_FRAME is TRUE start at the previous frame, | |
4349 | otherwise start at the current frame. Stop at the | |
4350 | first non-inline frame, or at the frame where the | |
4351 | step started. */ | |
4352 | ||
4353 | static bool | |
4354 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4355 | { | |
4356 | struct frame_info *frame = get_current_frame (); | |
4357 | ||
4358 | if (prev_frame) | |
4359 | frame = get_prev_frame (frame); | |
4360 | ||
4361 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4362 | { | |
4363 | const char *fn = NULL; | |
4364 | symtab_and_line sal; | |
4365 | struct symbol *sym; | |
4366 | ||
4367 | if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id)) | |
4368 | break; | |
4369 | if (get_frame_type (frame) != INLINE_FRAME) | |
4370 | break; | |
4371 | ||
4372 | sal = find_frame_sal (frame); | |
4373 | sym = get_frame_function (frame); | |
4374 | ||
4375 | if (sym != NULL) | |
4376 | fn = sym->print_name (); | |
4377 | ||
4378 | if (sal.line != 0 | |
4379 | && function_name_is_marked_for_skip (fn, sal)) | |
4380 | return true; | |
4381 | } | |
4382 | ||
4383 | return false; | |
4384 | } | |
4385 | ||
c65d6b55 PA |
4386 | /* If the event thread has the stop requested flag set, pretend it |
4387 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4388 | target_stop). */ | |
4389 | ||
4390 | static bool | |
4391 | handle_stop_requested (struct execution_control_state *ecs) | |
4392 | { | |
4393 | if (ecs->event_thread->stop_requested) | |
4394 | { | |
4395 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4396 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4397 | handle_signal_stop (ecs); | |
4398 | return true; | |
4399 | } | |
4400 | return false; | |
4401 | } | |
4402 | ||
a96d9b2e SDJ |
4403 | /* Auxiliary function that handles syscall entry/return events. |
4404 | It returns 1 if the inferior should keep going (and GDB | |
4405 | should ignore the event), or 0 if the event deserves to be | |
4406 | processed. */ | |
ca2163eb | 4407 | |
a96d9b2e | 4408 | static int |
ca2163eb | 4409 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4410 | { |
ca2163eb | 4411 | struct regcache *regcache; |
ca2163eb PA |
4412 | int syscall_number; |
4413 | ||
00431a78 | 4414 | context_switch (ecs); |
ca2163eb | 4415 | |
00431a78 | 4416 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4417 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4418 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4419 | |
a96d9b2e SDJ |
4420 | if (catch_syscall_enabled () > 0 |
4421 | && catching_syscall_number (syscall_number) > 0) | |
4422 | { | |
4423 | if (debug_infrun) | |
4424 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
4425 | syscall_number); | |
a96d9b2e | 4426 | |
16c381f0 | 4427 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4428 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4429 | ecs->event_thread->suspend.stop_pc, |
4430 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4431 | |
c65d6b55 PA |
4432 | if (handle_stop_requested (ecs)) |
4433 | return 0; | |
4434 | ||
ce12b012 | 4435 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4436 | { |
4437 | /* Catchpoint hit. */ | |
ca2163eb PA |
4438 | return 0; |
4439 | } | |
a96d9b2e | 4440 | } |
ca2163eb | 4441 | |
c65d6b55 PA |
4442 | if (handle_stop_requested (ecs)) |
4443 | return 0; | |
4444 | ||
ca2163eb | 4445 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb PA |
4446 | keep_going (ecs); |
4447 | return 1; | |
a96d9b2e SDJ |
4448 | } |
4449 | ||
7e324e48 GB |
4450 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4451 | ||
4452 | static void | |
4453 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4454 | struct execution_control_state *ecs) | |
4455 | { | |
4456 | if (!ecs->stop_func_filled_in) | |
4457 | { | |
98a617f8 KB |
4458 | const block *block; |
4459 | ||
7e324e48 GB |
4460 | /* Don't care about return value; stop_func_start and stop_func_name |
4461 | will both be 0 if it doesn't work. */ | |
98a617f8 KB |
4462 | find_pc_partial_function (ecs->event_thread->suspend.stop_pc, |
4463 | &ecs->stop_func_name, | |
4464 | &ecs->stop_func_start, | |
4465 | &ecs->stop_func_end, | |
4466 | &block); | |
4467 | ||
4468 | /* The call to find_pc_partial_function, above, will set | |
4469 | stop_func_start and stop_func_end to the start and end | |
4470 | of the range containing the stop pc. If this range | |
4471 | contains the entry pc for the block (which is always the | |
4472 | case for contiguous blocks), advance stop_func_start past | |
4473 | the function's start offset and entrypoint. Note that | |
4474 | stop_func_start is NOT advanced when in a range of a | |
4475 | non-contiguous block that does not contain the entry pc. */ | |
4476 | if (block != nullptr | |
4477 | && ecs->stop_func_start <= BLOCK_ENTRY_PC (block) | |
4478 | && BLOCK_ENTRY_PC (block) < ecs->stop_func_end) | |
4479 | { | |
4480 | ecs->stop_func_start | |
4481 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4482 | ||
4483 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4484 | ecs->stop_func_start | |
4485 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4486 | } | |
591a12a1 | 4487 | |
7e324e48 GB |
4488 | ecs->stop_func_filled_in = 1; |
4489 | } | |
4490 | } | |
4491 | ||
4f5d7f63 | 4492 | |
00431a78 | 4493 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4494 | |
4495 | static enum stop_kind | |
00431a78 | 4496 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4497 | { |
5b6d1e4f | 4498 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4499 | |
4500 | gdb_assert (inf != NULL); | |
4501 | return inf->control.stop_soon; | |
4502 | } | |
4503 | ||
5b6d1e4f PA |
4504 | /* Poll for one event out of the current target. Store the resulting |
4505 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4506 | |
4507 | static ptid_t | |
5b6d1e4f | 4508 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4509 | { |
4510 | ptid_t event_ptid; | |
372316f1 PA |
4511 | |
4512 | overlay_cache_invalid = 1; | |
4513 | ||
4514 | /* Flush target cache before starting to handle each event. | |
4515 | Target was running and cache could be stale. This is just a | |
4516 | heuristic. Running threads may modify target memory, but we | |
4517 | don't get any event. */ | |
4518 | target_dcache_invalidate (); | |
4519 | ||
4520 | if (deprecated_target_wait_hook) | |
5b6d1e4f | 4521 | event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 | 4522 | else |
5b6d1e4f | 4523 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4524 | |
4525 | if (debug_infrun) | |
5b6d1e4f | 4526 | print_target_wait_results (minus_one_ptid, event_ptid, ws); |
372316f1 PA |
4527 | |
4528 | return event_ptid; | |
4529 | } | |
4530 | ||
5b6d1e4f PA |
4531 | /* An event reported by wait_one. */ |
4532 | ||
4533 | struct wait_one_event | |
4534 | { | |
4535 | /* The target the event came out of. */ | |
4536 | process_stratum_target *target; | |
4537 | ||
4538 | /* The PTID the event was for. */ | |
4539 | ptid_t ptid; | |
4540 | ||
4541 | /* The waitstatus. */ | |
4542 | target_waitstatus ws; | |
4543 | }; | |
4544 | ||
4545 | /* Wait for one event out of any target. */ | |
4546 | ||
4547 | static wait_one_event | |
4548 | wait_one () | |
4549 | { | |
4550 | while (1) | |
4551 | { | |
4552 | for (inferior *inf : all_inferiors ()) | |
4553 | { | |
4554 | process_stratum_target *target = inf->process_target (); | |
4555 | if (target == NULL | |
4556 | || !target->is_async_p () | |
4557 | || !target->threads_executing) | |
4558 | continue; | |
4559 | ||
4560 | switch_to_inferior_no_thread (inf); | |
4561 | ||
4562 | wait_one_event event; | |
4563 | event.target = target; | |
4564 | event.ptid = poll_one_curr_target (&event.ws); | |
4565 | ||
4566 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4567 | { | |
4568 | /* If nothing is resumed, remove the target from the | |
4569 | event loop. */ | |
4570 | target_async (0); | |
4571 | } | |
4572 | else if (event.ws.kind != TARGET_WAITKIND_IGNORE) | |
4573 | return event; | |
4574 | } | |
4575 | ||
4576 | /* Block waiting for some event. */ | |
4577 | ||
4578 | fd_set readfds; | |
4579 | int nfds = 0; | |
4580 | ||
4581 | FD_ZERO (&readfds); | |
4582 | ||
4583 | for (inferior *inf : all_inferiors ()) | |
4584 | { | |
4585 | process_stratum_target *target = inf->process_target (); | |
4586 | if (target == NULL | |
4587 | || !target->is_async_p () | |
4588 | || !target->threads_executing) | |
4589 | continue; | |
4590 | ||
4591 | int fd = target->async_wait_fd (); | |
4592 | FD_SET (fd, &readfds); | |
4593 | if (nfds <= fd) | |
4594 | nfds = fd + 1; | |
4595 | } | |
4596 | ||
4597 | if (nfds == 0) | |
4598 | { | |
4599 | /* No waitable targets left. All must be stopped. */ | |
4600 | return {NULL, minus_one_ptid, {TARGET_WAITKIND_NO_RESUMED}}; | |
4601 | } | |
4602 | ||
4603 | QUIT; | |
4604 | ||
4605 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4606 | if (numfds < 0) | |
4607 | { | |
4608 | if (errno == EINTR) | |
4609 | continue; | |
4610 | else | |
4611 | perror_with_name ("interruptible_select"); | |
4612 | } | |
4613 | } | |
4614 | } | |
4615 | ||
372316f1 PA |
4616 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID |
4617 | instead of the current thread. */ | |
4618 | #define THREAD_STOPPED_BY(REASON) \ | |
4619 | static int \ | |
4620 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4621 | { \ | |
2989a365 | 4622 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); \ |
372316f1 PA |
4623 | inferior_ptid = ptid; \ |
4624 | \ | |
2989a365 | 4625 | return target_stopped_by_ ## REASON (); \ |
372316f1 PA |
4626 | } |
4627 | ||
4628 | /* Generate thread_stopped_by_watchpoint. */ | |
4629 | THREAD_STOPPED_BY (watchpoint) | |
4630 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4631 | THREAD_STOPPED_BY (sw_breakpoint) | |
4632 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4633 | THREAD_STOPPED_BY (hw_breakpoint) | |
4634 | ||
372316f1 PA |
4635 | /* Save the thread's event and stop reason to process it later. */ |
4636 | ||
4637 | static void | |
5b6d1e4f | 4638 | save_waitstatus (struct thread_info *tp, const target_waitstatus *ws) |
372316f1 | 4639 | { |
372316f1 PA |
4640 | if (debug_infrun) |
4641 | { | |
23fdd69e | 4642 | std::string statstr = target_waitstatus_to_string (ws); |
372316f1 | 4643 | |
372316f1 PA |
4644 | fprintf_unfiltered (gdb_stdlog, |
4645 | "infrun: saving status %s for %d.%ld.%ld\n", | |
23fdd69e | 4646 | statstr.c_str (), |
e99b03dc | 4647 | tp->ptid.pid (), |
e38504b3 | 4648 | tp->ptid.lwp (), |
cc6bcb54 | 4649 | tp->ptid.tid ()); |
372316f1 PA |
4650 | } |
4651 | ||
4652 | /* Record for later. */ | |
4653 | tp->suspend.waitstatus = *ws; | |
4654 | tp->suspend.waitstatus_pending_p = 1; | |
4655 | ||
00431a78 | 4656 | struct regcache *regcache = get_thread_regcache (tp); |
8b86c959 | 4657 | const address_space *aspace = regcache->aspace (); |
372316f1 PA |
4658 | |
4659 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4660 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4661 | { | |
4662 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4663 | ||
4664 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4665 | ||
4666 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4667 | { | |
4668 | tp->suspend.stop_reason | |
4669 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4670 | } | |
4671 | else if (target_supports_stopped_by_sw_breakpoint () | |
4672 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4673 | { | |
4674 | tp->suspend.stop_reason | |
4675 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4676 | } | |
4677 | else if (target_supports_stopped_by_hw_breakpoint () | |
4678 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4679 | { | |
4680 | tp->suspend.stop_reason | |
4681 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4682 | } | |
4683 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4684 | && hardware_breakpoint_inserted_here_p (aspace, | |
4685 | pc)) | |
4686 | { | |
4687 | tp->suspend.stop_reason | |
4688 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4689 | } | |
4690 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4691 | && software_breakpoint_inserted_here_p (aspace, | |
4692 | pc)) | |
4693 | { | |
4694 | tp->suspend.stop_reason | |
4695 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4696 | } | |
4697 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4698 | && currently_stepping (tp)) | |
4699 | { | |
4700 | tp->suspend.stop_reason | |
4701 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4702 | } | |
4703 | } | |
4704 | } | |
4705 | ||
6efcd9a8 | 4706 | /* See infrun.h. */ |
372316f1 | 4707 | |
6efcd9a8 | 4708 | void |
372316f1 PA |
4709 | stop_all_threads (void) |
4710 | { | |
4711 | /* We may need multiple passes to discover all threads. */ | |
4712 | int pass; | |
4713 | int iterations = 0; | |
372316f1 | 4714 | |
53cccef1 | 4715 | gdb_assert (exists_non_stop_target ()); |
372316f1 PA |
4716 | |
4717 | if (debug_infrun) | |
4718 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n"); | |
4719 | ||
00431a78 | 4720 | scoped_restore_current_thread restore_thread; |
372316f1 | 4721 | |
65706a29 | 4722 | target_thread_events (1); |
9885e6bb | 4723 | SCOPE_EXIT { target_thread_events (0); }; |
65706a29 | 4724 | |
372316f1 PA |
4725 | /* Request threads to stop, and then wait for the stops. Because |
4726 | threads we already know about can spawn more threads while we're | |
4727 | trying to stop them, and we only learn about new threads when we | |
4728 | update the thread list, do this in a loop, and keep iterating | |
4729 | until two passes find no threads that need to be stopped. */ | |
4730 | for (pass = 0; pass < 2; pass++, iterations++) | |
4731 | { | |
4732 | if (debug_infrun) | |
4733 | fprintf_unfiltered (gdb_stdlog, | |
4734 | "infrun: stop_all_threads, pass=%d, " | |
4735 | "iterations=%d\n", pass, iterations); | |
4736 | while (1) | |
4737 | { | |
372316f1 | 4738 | int need_wait = 0; |
372316f1 PA |
4739 | |
4740 | update_thread_list (); | |
4741 | ||
4742 | /* Go through all threads looking for threads that we need | |
4743 | to tell the target to stop. */ | |
08036331 | 4744 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 4745 | { |
53cccef1 TBA |
4746 | /* For a single-target setting with an all-stop target, |
4747 | we would not even arrive here. For a multi-target | |
4748 | setting, until GDB is able to handle a mixture of | |
4749 | all-stop and non-stop targets, simply skip all-stop | |
4750 | targets' threads. This should be fine due to the | |
4751 | protection of 'check_multi_target_resumption'. */ | |
4752 | ||
4753 | switch_to_thread_no_regs (t); | |
4754 | if (!target_is_non_stop_p ()) | |
4755 | continue; | |
4756 | ||
372316f1 PA |
4757 | if (t->executing) |
4758 | { | |
4759 | /* If already stopping, don't request a stop again. | |
4760 | We just haven't seen the notification yet. */ | |
4761 | if (!t->stop_requested) | |
4762 | { | |
4763 | if (debug_infrun) | |
4764 | fprintf_unfiltered (gdb_stdlog, | |
4765 | "infrun: %s executing, " | |
4766 | "need stop\n", | |
a068643d | 4767 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4768 | target_stop (t->ptid); |
4769 | t->stop_requested = 1; | |
4770 | } | |
4771 | else | |
4772 | { | |
4773 | if (debug_infrun) | |
4774 | fprintf_unfiltered (gdb_stdlog, | |
4775 | "infrun: %s executing, " | |
4776 | "already stopping\n", | |
a068643d | 4777 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4778 | } |
4779 | ||
4780 | if (t->stop_requested) | |
4781 | need_wait = 1; | |
4782 | } | |
4783 | else | |
4784 | { | |
4785 | if (debug_infrun) | |
4786 | fprintf_unfiltered (gdb_stdlog, | |
4787 | "infrun: %s not executing\n", | |
a068643d | 4788 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4789 | |
4790 | /* The thread may be not executing, but still be | |
4791 | resumed with a pending status to process. */ | |
719546c4 | 4792 | t->resumed = false; |
372316f1 PA |
4793 | } |
4794 | } | |
4795 | ||
4796 | if (!need_wait) | |
4797 | break; | |
4798 | ||
4799 | /* If we find new threads on the second iteration, restart | |
4800 | over. We want to see two iterations in a row with all | |
4801 | threads stopped. */ | |
4802 | if (pass > 0) | |
4803 | pass = -1; | |
4804 | ||
5b6d1e4f PA |
4805 | wait_one_event event = wait_one (); |
4806 | ||
c29705b7 | 4807 | if (debug_infrun) |
372316f1 | 4808 | { |
c29705b7 PW |
4809 | fprintf_unfiltered (gdb_stdlog, |
4810 | "infrun: stop_all_threads %s %s\n", | |
5b6d1e4f PA |
4811 | target_waitstatus_to_string (&event.ws).c_str (), |
4812 | target_pid_to_str (event.ptid).c_str ()); | |
372316f1 | 4813 | } |
372316f1 | 4814 | |
5b6d1e4f PA |
4815 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED |
4816 | || event.ws.kind == TARGET_WAITKIND_THREAD_EXITED | |
4817 | || event.ws.kind == TARGET_WAITKIND_EXITED | |
4818 | || event.ws.kind == TARGET_WAITKIND_SIGNALLED) | |
c29705b7 PW |
4819 | { |
4820 | /* All resumed threads exited | |
4821 | or one thread/process exited/signalled. */ | |
372316f1 PA |
4822 | } |
4823 | else | |
4824 | { | |
5b6d1e4f | 4825 | thread_info *t = find_thread_ptid (event.target, event.ptid); |
372316f1 | 4826 | if (t == NULL) |
5b6d1e4f | 4827 | t = add_thread (event.target, event.ptid); |
372316f1 PA |
4828 | |
4829 | t->stop_requested = 0; | |
4830 | t->executing = 0; | |
719546c4 | 4831 | t->resumed = false; |
372316f1 PA |
4832 | t->control.may_range_step = 0; |
4833 | ||
6efcd9a8 PA |
4834 | /* This may be the first time we see the inferior report |
4835 | a stop. */ | |
5b6d1e4f | 4836 | inferior *inf = find_inferior_ptid (event.target, event.ptid); |
6efcd9a8 PA |
4837 | if (inf->needs_setup) |
4838 | { | |
4839 | switch_to_thread_no_regs (t); | |
4840 | setup_inferior (0); | |
4841 | } | |
4842 | ||
5b6d1e4f PA |
4843 | if (event.ws.kind == TARGET_WAITKIND_STOPPED |
4844 | && event.ws.value.sig == GDB_SIGNAL_0) | |
372316f1 PA |
4845 | { |
4846 | /* We caught the event that we intended to catch, so | |
4847 | there's no event pending. */ | |
4848 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4849 | t->suspend.waitstatus_pending_p = 0; | |
4850 | ||
00431a78 | 4851 | if (displaced_step_fixup (t, GDB_SIGNAL_0) < 0) |
372316f1 PA |
4852 | { |
4853 | /* Add it back to the step-over queue. */ | |
4854 | if (debug_infrun) | |
4855 | { | |
4856 | fprintf_unfiltered (gdb_stdlog, | |
4857 | "infrun: displaced-step of %s " | |
4858 | "canceled: adding back to the " | |
4859 | "step-over queue\n", | |
a068643d | 4860 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4861 | } |
4862 | t->control.trap_expected = 0; | |
4863 | thread_step_over_chain_enqueue (t); | |
4864 | } | |
4865 | } | |
4866 | else | |
4867 | { | |
4868 | enum gdb_signal sig; | |
4869 | struct regcache *regcache; | |
372316f1 PA |
4870 | |
4871 | if (debug_infrun) | |
4872 | { | |
5b6d1e4f | 4873 | std::string statstr = target_waitstatus_to_string (&event.ws); |
372316f1 | 4874 | |
372316f1 PA |
4875 | fprintf_unfiltered (gdb_stdlog, |
4876 | "infrun: target_wait %s, saving " | |
4877 | "status for %d.%ld.%ld\n", | |
23fdd69e | 4878 | statstr.c_str (), |
e99b03dc | 4879 | t->ptid.pid (), |
e38504b3 | 4880 | t->ptid.lwp (), |
cc6bcb54 | 4881 | t->ptid.tid ()); |
372316f1 PA |
4882 | } |
4883 | ||
4884 | /* Record for later. */ | |
5b6d1e4f | 4885 | save_waitstatus (t, &event.ws); |
372316f1 | 4886 | |
5b6d1e4f PA |
4887 | sig = (event.ws.kind == TARGET_WAITKIND_STOPPED |
4888 | ? event.ws.value.sig : GDB_SIGNAL_0); | |
372316f1 | 4889 | |
00431a78 | 4890 | if (displaced_step_fixup (t, sig) < 0) |
372316f1 PA |
4891 | { |
4892 | /* Add it back to the step-over queue. */ | |
4893 | t->control.trap_expected = 0; | |
4894 | thread_step_over_chain_enqueue (t); | |
4895 | } | |
4896 | ||
00431a78 | 4897 | regcache = get_thread_regcache (t); |
372316f1 PA |
4898 | t->suspend.stop_pc = regcache_read_pc (regcache); |
4899 | ||
4900 | if (debug_infrun) | |
4901 | { | |
4902 | fprintf_unfiltered (gdb_stdlog, | |
4903 | "infrun: saved stop_pc=%s for %s " | |
4904 | "(currently_stepping=%d)\n", | |
4905 | paddress (target_gdbarch (), | |
4906 | t->suspend.stop_pc), | |
a068643d | 4907 | target_pid_to_str (t->ptid).c_str (), |
372316f1 PA |
4908 | currently_stepping (t)); |
4909 | } | |
4910 | } | |
4911 | } | |
4912 | } | |
4913 | } | |
4914 | ||
372316f1 PA |
4915 | if (debug_infrun) |
4916 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n"); | |
4917 | } | |
4918 | ||
f4836ba9 PA |
4919 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4920 | ||
4921 | static int | |
4922 | handle_no_resumed (struct execution_control_state *ecs) | |
4923 | { | |
3b12939d | 4924 | if (target_can_async_p ()) |
f4836ba9 | 4925 | { |
3b12939d PA |
4926 | struct ui *ui; |
4927 | int any_sync = 0; | |
f4836ba9 | 4928 | |
3b12939d PA |
4929 | ALL_UIS (ui) |
4930 | { | |
4931 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4932 | { | |
4933 | any_sync = 1; | |
4934 | break; | |
4935 | } | |
4936 | } | |
4937 | if (!any_sync) | |
4938 | { | |
4939 | /* There were no unwaited-for children left in the target, but, | |
4940 | we're not synchronously waiting for events either. Just | |
4941 | ignore. */ | |
4942 | ||
4943 | if (debug_infrun) | |
4944 | fprintf_unfiltered (gdb_stdlog, | |
4945 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4946 | "(ignoring: bg)\n"); | |
4947 | prepare_to_wait (ecs); | |
4948 | return 1; | |
4949 | } | |
f4836ba9 PA |
4950 | } |
4951 | ||
4952 | /* Otherwise, if we were running a synchronous execution command, we | |
4953 | may need to cancel it and give the user back the terminal. | |
4954 | ||
4955 | In non-stop mode, the target can't tell whether we've already | |
4956 | consumed previous stop events, so it can end up sending us a | |
4957 | no-resumed event like so: | |
4958 | ||
4959 | #0 - thread 1 is left stopped | |
4960 | ||
4961 | #1 - thread 2 is resumed and hits breakpoint | |
4962 | -> TARGET_WAITKIND_STOPPED | |
4963 | ||
4964 | #2 - thread 3 is resumed and exits | |
4965 | this is the last resumed thread, so | |
4966 | -> TARGET_WAITKIND_NO_RESUMED | |
4967 | ||
4968 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4969 | it. | |
4970 | ||
4971 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4972 | thread 2 is now resumed, so the event should be ignored. | |
4973 | ||
4974 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4975 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4976 | event. But it could be that the event meant that thread 2 itself | |
4977 | (or whatever other thread was the last resumed thread) exited. | |
4978 | ||
4979 | To address this we refresh the thread list and check whether we | |
4980 | have resumed threads _now_. In the example above, this removes | |
4981 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4982 | ignore this event. If we find no thread resumed, then we cancel | |
4983 | the synchronous command show "no unwaited-for " to the user. */ | |
4984 | update_thread_list (); | |
4985 | ||
5b6d1e4f | 4986 | for (thread_info *thread : all_non_exited_threads (ecs->target)) |
f4836ba9 PA |
4987 | { |
4988 | if (thread->executing | |
4989 | || thread->suspend.waitstatus_pending_p) | |
4990 | { | |
4991 | /* There were no unwaited-for children left in the target at | |
4992 | some point, but there are now. Just ignore. */ | |
4993 | if (debug_infrun) | |
4994 | fprintf_unfiltered (gdb_stdlog, | |
4995 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4996 | "(ignoring: found resumed)\n"); | |
4997 | prepare_to_wait (ecs); | |
4998 | return 1; | |
4999 | } | |
5000 | } | |
5001 | ||
5002 | /* Note however that we may find no resumed thread because the whole | |
5003 | process exited meanwhile (thus updating the thread list results | |
5004 | in an empty thread list). In this case we know we'll be getting | |
5005 | a process exit event shortly. */ | |
5b6d1e4f | 5006 | for (inferior *inf : all_non_exited_inferiors (ecs->target)) |
f4836ba9 | 5007 | { |
08036331 | 5008 | thread_info *thread = any_live_thread_of_inferior (inf); |
f4836ba9 PA |
5009 | if (thread == NULL) |
5010 | { | |
5011 | if (debug_infrun) | |
5012 | fprintf_unfiltered (gdb_stdlog, | |
5013 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
5014 | "(expect process exit)\n"); | |
5015 | prepare_to_wait (ecs); | |
5016 | return 1; | |
5017 | } | |
5018 | } | |
5019 | ||
5020 | /* Go ahead and report the event. */ | |
5021 | return 0; | |
5022 | } | |
5023 | ||
05ba8510 PA |
5024 | /* Given an execution control state that has been freshly filled in by |
5025 | an event from the inferior, figure out what it means and take | |
5026 | appropriate action. | |
5027 | ||
5028 | The alternatives are: | |
5029 | ||
22bcd14b | 5030 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5031 | debugger. |
5032 | ||
5033 | 2) keep_going and return; to wait for the next event (set | |
5034 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5035 | once). */ | |
c906108c | 5036 | |
ec9499be | 5037 | static void |
595915c1 | 5038 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5039 | { |
595915c1 TT |
5040 | /* Make sure that all temporary struct value objects that were |
5041 | created during the handling of the event get deleted at the | |
5042 | end. */ | |
5043 | scoped_value_mark free_values; | |
5044 | ||
d6b48e9c PA |
5045 | enum stop_kind stop_soon; |
5046 | ||
c29705b7 PW |
5047 | if (debug_infrun) |
5048 | fprintf_unfiltered (gdb_stdlog, "infrun: handle_inferior_event %s\n", | |
5049 | target_waitstatus_to_string (&ecs->ws).c_str ()); | |
5050 | ||
28736962 PA |
5051 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
5052 | { | |
5053 | /* We had an event in the inferior, but we are not interested in | |
5054 | handling it at this level. The lower layers have already | |
5055 | done what needs to be done, if anything. | |
5056 | ||
5057 | One of the possible circumstances for this is when the | |
5058 | inferior produces output for the console. The inferior has | |
5059 | not stopped, and we are ignoring the event. Another possible | |
5060 | circumstance is any event which the lower level knows will be | |
5061 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5062 | prepare_to_wait (ecs); |
5063 | return; | |
5064 | } | |
5065 | ||
65706a29 PA |
5066 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
5067 | { | |
65706a29 PA |
5068 | prepare_to_wait (ecs); |
5069 | return; | |
5070 | } | |
5071 | ||
0e5bf2a8 | 5072 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5073 | && handle_no_resumed (ecs)) |
5074 | return; | |
0e5bf2a8 | 5075 | |
5b6d1e4f PA |
5076 | /* Cache the last target/ptid/waitstatus. */ |
5077 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5078 | |
ca005067 | 5079 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5080 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5081 | |
0e5bf2a8 PA |
5082 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
5083 | { | |
5084 | /* No unwaited-for children left. IOW, all resumed children | |
5085 | have exited. */ | |
0e5bf2a8 | 5086 | stop_print_frame = 0; |
22bcd14b | 5087 | stop_waiting (ecs); |
0e5bf2a8 PA |
5088 | return; |
5089 | } | |
5090 | ||
8c90c137 | 5091 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 5092 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 | 5093 | { |
5b6d1e4f | 5094 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5095 | /* If it's a new thread, add it to the thread database. */ |
5096 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5097 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5098 | |
5099 | /* Disable range stepping. If the next step request could use a | |
5100 | range, this will be end up re-enabled then. */ | |
5101 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5102 | } |
88ed393a JK |
5103 | |
5104 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 5105 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
5106 | |
5107 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5108 | reinit_frame_cache (); | |
5109 | ||
28736962 PA |
5110 | breakpoint_retire_moribund (); |
5111 | ||
2b009048 DJ |
5112 | /* First, distinguish signals caused by the debugger from signals |
5113 | that have to do with the program's own actions. Note that | |
5114 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5115 | on the operating system version. Here we detect when a SIGILL or | |
5116 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5117 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5118 | when we're trying to execute a breakpoint instruction on a | |
5119 | non-executable stack. This happens for call dummy breakpoints | |
5120 | for architectures like SPARC that place call dummies on the | |
5121 | stack. */ | |
2b009048 | 5122 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
5123 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
5124 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
5125 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 5126 | { |
00431a78 | 5127 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5128 | |
a01bda52 | 5129 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5130 | regcache_read_pc (regcache))) |
5131 | { | |
5132 | if (debug_infrun) | |
5133 | fprintf_unfiltered (gdb_stdlog, | |
5134 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 5135 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 5136 | } |
2b009048 DJ |
5137 | } |
5138 | ||
28736962 PA |
5139 | /* Mark the non-executing threads accordingly. In all-stop, all |
5140 | threads of all processes are stopped when we get any event | |
e1316e60 | 5141 | reported. In non-stop mode, only the event thread stops. */ |
372316f1 PA |
5142 | { |
5143 | ptid_t mark_ptid; | |
5144 | ||
fbea99ea | 5145 | if (!target_is_non_stop_p ()) |
372316f1 PA |
5146 | mark_ptid = minus_one_ptid; |
5147 | else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED | |
5148 | || ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
5149 | { | |
5150 | /* If we're handling a process exit in non-stop mode, even | |
5151 | though threads haven't been deleted yet, one would think | |
5152 | that there is nothing to do, as threads of the dead process | |
5153 | will be soon deleted, and threads of any other process were | |
5154 | left running. However, on some targets, threads survive a | |
5155 | process exit event. E.g., for the "checkpoint" command, | |
5156 | when the current checkpoint/fork exits, linux-fork.c | |
5157 | automatically switches to another fork from within | |
5158 | target_mourn_inferior, by associating the same | |
5159 | inferior/thread to another fork. We haven't mourned yet at | |
5160 | this point, but we must mark any threads left in the | |
5161 | process as not-executing so that finish_thread_state marks | |
5162 | them stopped (in the user's perspective) if/when we present | |
5163 | the stop to the user. */ | |
e99b03dc | 5164 | mark_ptid = ptid_t (ecs->ptid.pid ()); |
372316f1 PA |
5165 | } |
5166 | else | |
5167 | mark_ptid = ecs->ptid; | |
5168 | ||
719546c4 | 5169 | set_executing (ecs->target, mark_ptid, false); |
372316f1 PA |
5170 | |
5171 | /* Likewise the resumed flag. */ | |
719546c4 | 5172 | set_resumed (ecs->target, mark_ptid, false); |
372316f1 | 5173 | } |
8c90c137 | 5174 | |
488f131b JB |
5175 | switch (ecs->ws.kind) |
5176 | { | |
5177 | case TARGET_WAITKIND_LOADED: | |
00431a78 | 5178 | context_switch (ecs); |
b0f4b84b DJ |
5179 | /* Ignore gracefully during startup of the inferior, as it might |
5180 | be the shell which has just loaded some objects, otherwise | |
5181 | add the symbols for the newly loaded objects. Also ignore at | |
5182 | the beginning of an attach or remote session; we will query | |
5183 | the full list of libraries once the connection is | |
5184 | established. */ | |
4f5d7f63 | 5185 | |
00431a78 | 5186 | stop_soon = get_inferior_stop_soon (ecs); |
c0236d92 | 5187 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 5188 | { |
edcc5120 TT |
5189 | struct regcache *regcache; |
5190 | ||
00431a78 | 5191 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 TT |
5192 | |
5193 | handle_solib_event (); | |
5194 | ||
5195 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 5196 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
5197 | ecs->event_thread->suspend.stop_pc, |
5198 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 5199 | |
c65d6b55 PA |
5200 | if (handle_stop_requested (ecs)) |
5201 | return; | |
5202 | ||
ce12b012 | 5203 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
5204 | { |
5205 | /* A catchpoint triggered. */ | |
94c57d6a PA |
5206 | process_event_stop_test (ecs); |
5207 | return; | |
edcc5120 | 5208 | } |
488f131b | 5209 | |
b0f4b84b DJ |
5210 | /* If requested, stop when the dynamic linker notifies |
5211 | gdb of events. This allows the user to get control | |
5212 | and place breakpoints in initializer routines for | |
5213 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 5214 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
5215 | if (stop_on_solib_events) |
5216 | { | |
55409f9d DJ |
5217 | /* Make sure we print "Stopped due to solib-event" in |
5218 | normal_stop. */ | |
5219 | stop_print_frame = 1; | |
5220 | ||
22bcd14b | 5221 | stop_waiting (ecs); |
b0f4b84b DJ |
5222 | return; |
5223 | } | |
488f131b | 5224 | } |
b0f4b84b DJ |
5225 | |
5226 | /* If we are skipping through a shell, or through shared library | |
5227 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 5228 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
5229 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
5230 | { | |
74960c60 VP |
5231 | /* Loading of shared libraries might have changed breakpoint |
5232 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 5233 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 5234 | insert_breakpoints (); |
64ce06e4 | 5235 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
5236 | prepare_to_wait (ecs); |
5237 | return; | |
5238 | } | |
5239 | ||
5c09a2c5 PA |
5240 | /* But stop if we're attaching or setting up a remote |
5241 | connection. */ | |
5242 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5243 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5244 | { | |
5245 | if (debug_infrun) | |
5246 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 5247 | stop_waiting (ecs); |
5c09a2c5 PA |
5248 | return; |
5249 | } | |
5250 | ||
5251 | internal_error (__FILE__, __LINE__, | |
5252 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 5253 | |
488f131b | 5254 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5255 | if (handle_stop_requested (ecs)) |
5256 | return; | |
00431a78 | 5257 | context_switch (ecs); |
64ce06e4 | 5258 | resume (GDB_SIGNAL_0); |
488f131b JB |
5259 | prepare_to_wait (ecs); |
5260 | return; | |
c5aa993b | 5261 | |
65706a29 | 5262 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5263 | if (handle_stop_requested (ecs)) |
5264 | return; | |
00431a78 | 5265 | context_switch (ecs); |
65706a29 PA |
5266 | if (!switch_back_to_stepped_thread (ecs)) |
5267 | keep_going (ecs); | |
5268 | return; | |
5269 | ||
488f131b | 5270 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5271 | case TARGET_WAITKIND_SIGNALLED: |
fb66883a | 5272 | inferior_ptid = ecs->ptid; |
5b6d1e4f | 5273 | set_current_inferior (find_inferior_ptid (ecs->target, ecs->ptid)); |
6c95b8df PA |
5274 | set_current_program_space (current_inferior ()->pspace); |
5275 | handle_vfork_child_exec_or_exit (0); | |
223ffa71 | 5276 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5277 | |
0c557179 SDJ |
5278 | /* Clearing any previous state of convenience variables. */ |
5279 | clear_exit_convenience_vars (); | |
5280 | ||
940c3c06 PA |
5281 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5282 | { | |
5283 | /* Record the exit code in the convenience variable $_exitcode, so | |
5284 | that the user can inspect this again later. */ | |
5285 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5286 | (LONGEST) ecs->ws.value.integer); | |
5287 | ||
5288 | /* Also record this in the inferior itself. */ | |
5289 | current_inferior ()->has_exit_code = 1; | |
5290 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5291 | |
98eb56a4 PA |
5292 | /* Support the --return-child-result option. */ |
5293 | return_child_result_value = ecs->ws.value.integer; | |
5294 | ||
76727919 | 5295 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
5296 | } |
5297 | else | |
0c557179 | 5298 | { |
00431a78 | 5299 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5300 | |
5301 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5302 | { | |
5303 | /* Set the value of the internal variable $_exitsignal, | |
5304 | which holds the signal uncaught by the inferior. */ | |
5305 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5306 | gdbarch_gdb_signal_to_target (gdbarch, | |
5307 | ecs->ws.value.sig)); | |
5308 | } | |
5309 | else | |
5310 | { | |
5311 | /* We don't have access to the target's method used for | |
5312 | converting between signal numbers (GDB's internal | |
5313 | representation <-> target's representation). | |
5314 | Therefore, we cannot do a good job at displaying this | |
5315 | information to the user. It's better to just warn | |
5316 | her about it (if infrun debugging is enabled), and | |
5317 | give up. */ | |
5318 | if (debug_infrun) | |
5319 | fprintf_filtered (gdb_stdlog, _("\ | |
5320 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
5321 | } | |
5322 | ||
76727919 | 5323 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 5324 | } |
8cf64490 | 5325 | |
488f131b | 5326 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5327 | target_mourn_inferior (inferior_ptid); |
488f131b | 5328 | stop_print_frame = 0; |
22bcd14b | 5329 | stop_waiting (ecs); |
488f131b | 5330 | return; |
c5aa993b | 5331 | |
488f131b | 5332 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5333 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5334 | /* Check whether the inferior is displaced stepping. */ |
5335 | { | |
00431a78 | 5336 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5337 | struct gdbarch *gdbarch = regcache->arch (); |
e2d96639 YQ |
5338 | |
5339 | /* If checking displaced stepping is supported, and thread | |
5340 | ecs->ptid is displaced stepping. */ | |
00431a78 | 5341 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 YQ |
5342 | { |
5343 | struct inferior *parent_inf | |
5b6d1e4f | 5344 | = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 YQ |
5345 | struct regcache *child_regcache; |
5346 | CORE_ADDR parent_pc; | |
5347 | ||
d8d83535 SM |
5348 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) |
5349 | { | |
5350 | struct displaced_step_inferior_state *displaced | |
5351 | = get_displaced_stepping_state (parent_inf); | |
5352 | ||
5353 | /* Restore scratch pad for child process. */ | |
5354 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
5355 | } | |
5356 | ||
e2d96639 YQ |
5357 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, |
5358 | indicating that the displaced stepping of syscall instruction | |
5359 | has been done. Perform cleanup for parent process here. Note | |
5360 | that this operation also cleans up the child process for vfork, | |
5361 | because their pages are shared. */ | |
00431a78 | 5362 | displaced_step_fixup (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5363 | /* Start a new step-over in another thread if there's one |
5364 | that needs it. */ | |
5365 | start_step_over (); | |
e2d96639 | 5366 | |
e2d96639 YQ |
5367 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5368 | the child's PC is also within the scratchpad. Set the child's PC | |
5369 | to the parent's PC value, which has already been fixed up. | |
5370 | FIXME: we use the parent's aspace here, although we're touching | |
5371 | the child, because the child hasn't been added to the inferior | |
5372 | list yet at this point. */ | |
5373 | ||
5374 | child_regcache | |
5b6d1e4f PA |
5375 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
5376 | ecs->ws.value.related_pid, | |
e2d96639 YQ |
5377 | gdbarch, |
5378 | parent_inf->aspace); | |
5379 | /* Read PC value of parent process. */ | |
5380 | parent_pc = regcache_read_pc (regcache); | |
5381 | ||
5382 | if (debug_displaced) | |
5383 | fprintf_unfiltered (gdb_stdlog, | |
5384 | "displaced: write child pc from %s to %s\n", | |
5385 | paddress (gdbarch, | |
5386 | regcache_read_pc (child_regcache)), | |
5387 | paddress (gdbarch, parent_pc)); | |
5388 | ||
5389 | regcache_write_pc (child_regcache, parent_pc); | |
5390 | } | |
5391 | } | |
5392 | ||
00431a78 | 5393 | context_switch (ecs); |
5a2901d9 | 5394 | |
b242c3c2 PA |
5395 | /* Immediately detach breakpoints from the child before there's |
5396 | any chance of letting the user delete breakpoints from the | |
5397 | breakpoint lists. If we don't do this early, it's easy to | |
5398 | leave left over traps in the child, vis: "break foo; catch | |
5399 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5400 | the fork on the last `continue', and by that time the | |
5401 | breakpoint at "foo" is long gone from the breakpoint table. | |
5402 | If we vforked, then we don't need to unpatch here, since both | |
5403 | parent and child are sharing the same memory pages; we'll | |
5404 | need to unpatch at follow/detach time instead to be certain | |
5405 | that new breakpoints added between catchpoint hit time and | |
5406 | vfork follow are detached. */ | |
5407 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5408 | { | |
b242c3c2 PA |
5409 | /* This won't actually modify the breakpoint list, but will |
5410 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5411 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5412 | } |
5413 | ||
34b7e8a6 | 5414 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5415 | |
e58b0e63 PA |
5416 | /* In case the event is caught by a catchpoint, remember that |
5417 | the event is to be followed at the next resume of the thread, | |
5418 | and not immediately. */ | |
5419 | ecs->event_thread->pending_follow = ecs->ws; | |
5420 | ||
f2ffa92b PA |
5421 | ecs->event_thread->suspend.stop_pc |
5422 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 5423 | |
16c381f0 | 5424 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5425 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5426 | ecs->event_thread->suspend.stop_pc, |
5427 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 5428 | |
c65d6b55 PA |
5429 | if (handle_stop_requested (ecs)) |
5430 | return; | |
5431 | ||
ce12b012 PA |
5432 | /* If no catchpoint triggered for this, then keep going. Note |
5433 | that we're interested in knowing the bpstat actually causes a | |
5434 | stop, not just if it may explain the signal. Software | |
5435 | watchpoints, for example, always appear in the bpstat. */ | |
5436 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5437 | { |
5ab2fbf1 | 5438 | bool follow_child |
3e43a32a | 5439 | = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 5440 | |
a493e3e2 | 5441 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 | 5442 | |
5b6d1e4f PA |
5443 | process_stratum_target *targ |
5444 | = ecs->event_thread->inf->process_target (); | |
5445 | ||
5ab2fbf1 | 5446 | bool should_resume = follow_fork (); |
e58b0e63 | 5447 | |
5b6d1e4f PA |
5448 | /* Note that one of these may be an invalid pointer, |
5449 | depending on detach_fork. */ | |
00431a78 | 5450 | thread_info *parent = ecs->event_thread; |
5b6d1e4f PA |
5451 | thread_info *child |
5452 | = find_thread_ptid (targ, ecs->ws.value.related_pid); | |
6c95b8df | 5453 | |
a2077e25 PA |
5454 | /* At this point, the parent is marked running, and the |
5455 | child is marked stopped. */ | |
5456 | ||
5457 | /* If not resuming the parent, mark it stopped. */ | |
5458 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5459 | parent->set_running (false); |
a2077e25 PA |
5460 | |
5461 | /* If resuming the child, mark it running. */ | |
5462 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5463 | child->set_running (true); |
a2077e25 | 5464 | |
6c95b8df | 5465 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5466 | if (!detach_fork && (non_stop |
5467 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5468 | { |
5469 | if (follow_child) | |
5470 | switch_to_thread (parent); | |
5471 | else | |
5472 | switch_to_thread (child); | |
5473 | ||
5474 | ecs->event_thread = inferior_thread (); | |
5475 | ecs->ptid = inferior_ptid; | |
5476 | keep_going (ecs); | |
5477 | } | |
5478 | ||
5479 | if (follow_child) | |
5480 | switch_to_thread (child); | |
5481 | else | |
5482 | switch_to_thread (parent); | |
5483 | ||
e58b0e63 PA |
5484 | ecs->event_thread = inferior_thread (); |
5485 | ecs->ptid = inferior_ptid; | |
5486 | ||
5487 | if (should_resume) | |
5488 | keep_going (ecs); | |
5489 | else | |
22bcd14b | 5490 | stop_waiting (ecs); |
04e68871 DJ |
5491 | return; |
5492 | } | |
94c57d6a PA |
5493 | process_event_stop_test (ecs); |
5494 | return; | |
488f131b | 5495 | |
6c95b8df PA |
5496 | case TARGET_WAITKIND_VFORK_DONE: |
5497 | /* Done with the shared memory region. Re-insert breakpoints in | |
5498 | the parent, and keep going. */ | |
5499 | ||
00431a78 | 5500 | context_switch (ecs); |
6c95b8df PA |
5501 | |
5502 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5503 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5504 | |
5505 | if (handle_stop_requested (ecs)) | |
5506 | return; | |
5507 | ||
6c95b8df PA |
5508 | /* This also takes care of reinserting breakpoints in the |
5509 | previously locked inferior. */ | |
5510 | keep_going (ecs); | |
5511 | return; | |
5512 | ||
488f131b | 5513 | case TARGET_WAITKIND_EXECD: |
488f131b | 5514 | |
cbd2b4e3 PA |
5515 | /* Note we can't read registers yet (the stop_pc), because we |
5516 | don't yet know the inferior's post-exec architecture. | |
5517 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5518 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5519 | |
6c95b8df PA |
5520 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5521 | handle_vfork_child_exec_or_exit (1); | |
5522 | ||
795e548f PA |
5523 | /* This causes the eventpoints and symbol table to be reset. |
5524 | Must do this now, before trying to determine whether to | |
5525 | stop. */ | |
71b43ef8 | 5526 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5527 | |
17d8546e DB |
5528 | /* In follow_exec we may have deleted the original thread and |
5529 | created a new one. Make sure that the event thread is the | |
5530 | execd thread for that case (this is a nop otherwise). */ | |
5531 | ecs->event_thread = inferior_thread (); | |
5532 | ||
f2ffa92b PA |
5533 | ecs->event_thread->suspend.stop_pc |
5534 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5535 | |
16c381f0 | 5536 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5537 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5538 | ecs->event_thread->suspend.stop_pc, |
5539 | ecs->event_thread, &ecs->ws); | |
795e548f | 5540 | |
71b43ef8 PA |
5541 | /* Note that this may be referenced from inside |
5542 | bpstat_stop_status above, through inferior_has_execd. */ | |
5543 | xfree (ecs->ws.value.execd_pathname); | |
5544 | ecs->ws.value.execd_pathname = NULL; | |
5545 | ||
c65d6b55 PA |
5546 | if (handle_stop_requested (ecs)) |
5547 | return; | |
5548 | ||
04e68871 | 5549 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5550 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5551 | { |
a493e3e2 | 5552 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5553 | keep_going (ecs); |
5554 | return; | |
5555 | } | |
94c57d6a PA |
5556 | process_event_stop_test (ecs); |
5557 | return; | |
488f131b | 5558 | |
b4dc5ffa MK |
5559 | /* Be careful not to try to gather much state about a thread |
5560 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5561 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5562 | /* Getting the current syscall number. */ |
94c57d6a PA |
5563 | if (handle_syscall_event (ecs) == 0) |
5564 | process_event_stop_test (ecs); | |
5565 | return; | |
c906108c | 5566 | |
488f131b JB |
5567 | /* Before examining the threads further, step this thread to |
5568 | get it entirely out of the syscall. (We get notice of the | |
5569 | event when the thread is just on the verge of exiting a | |
5570 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5571 | into user code.) */ |
488f131b | 5572 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5573 | if (handle_syscall_event (ecs) == 0) |
5574 | process_event_stop_test (ecs); | |
5575 | return; | |
c906108c | 5576 | |
488f131b | 5577 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5578 | handle_signal_stop (ecs); |
5579 | return; | |
c906108c | 5580 | |
b2175913 MS |
5581 | case TARGET_WAITKIND_NO_HISTORY: |
5582 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5583 | |
d1988021 | 5584 | /* Switch to the stopped thread. */ |
00431a78 | 5585 | context_switch (ecs); |
d1988021 MM |
5586 | if (debug_infrun) |
5587 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
5588 | ||
34b7e8a6 | 5589 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5590 | ecs->event_thread->suspend.stop_pc |
5591 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5592 | |
5593 | if (handle_stop_requested (ecs)) | |
5594 | return; | |
5595 | ||
76727919 | 5596 | gdb::observers::no_history.notify (); |
22bcd14b | 5597 | stop_waiting (ecs); |
b2175913 | 5598 | return; |
488f131b | 5599 | } |
4f5d7f63 PA |
5600 | } |
5601 | ||
372316f1 PA |
5602 | /* Restart threads back to what they were trying to do back when we |
5603 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5604 | ignored. */ | |
4d9d9d04 PA |
5605 | |
5606 | static void | |
372316f1 PA |
5607 | restart_threads (struct thread_info *event_thread) |
5608 | { | |
372316f1 PA |
5609 | /* In case the instruction just stepped spawned a new thread. */ |
5610 | update_thread_list (); | |
5611 | ||
08036331 | 5612 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5613 | { |
f3f8ece4 PA |
5614 | switch_to_thread_no_regs (tp); |
5615 | ||
372316f1 PA |
5616 | if (tp == event_thread) |
5617 | { | |
5618 | if (debug_infrun) | |
5619 | fprintf_unfiltered (gdb_stdlog, | |
5620 | "infrun: restart threads: " | |
5621 | "[%s] is event thread\n", | |
a068643d | 5622 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5623 | continue; |
5624 | } | |
5625 | ||
5626 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5627 | { | |
5628 | if (debug_infrun) | |
5629 | fprintf_unfiltered (gdb_stdlog, | |
5630 | "infrun: restart threads: " | |
5631 | "[%s] not meant to be running\n", | |
a068643d | 5632 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5633 | continue; |
5634 | } | |
5635 | ||
5636 | if (tp->resumed) | |
5637 | { | |
5638 | if (debug_infrun) | |
5639 | fprintf_unfiltered (gdb_stdlog, | |
5640 | "infrun: restart threads: [%s] resumed\n", | |
a068643d | 5641 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5642 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
5643 | continue; | |
5644 | } | |
5645 | ||
5646 | if (thread_is_in_step_over_chain (tp)) | |
5647 | { | |
5648 | if (debug_infrun) | |
5649 | fprintf_unfiltered (gdb_stdlog, | |
5650 | "infrun: restart threads: " | |
5651 | "[%s] needs step-over\n", | |
a068643d | 5652 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5653 | gdb_assert (!tp->resumed); |
5654 | continue; | |
5655 | } | |
5656 | ||
5657 | ||
5658 | if (tp->suspend.waitstatus_pending_p) | |
5659 | { | |
5660 | if (debug_infrun) | |
5661 | fprintf_unfiltered (gdb_stdlog, | |
5662 | "infrun: restart threads: " | |
5663 | "[%s] has pending status\n", | |
a068643d | 5664 | target_pid_to_str (tp->ptid).c_str ()); |
719546c4 | 5665 | tp->resumed = true; |
372316f1 PA |
5666 | continue; |
5667 | } | |
5668 | ||
c65d6b55 PA |
5669 | gdb_assert (!tp->stop_requested); |
5670 | ||
372316f1 PA |
5671 | /* If some thread needs to start a step-over at this point, it |
5672 | should still be in the step-over queue, and thus skipped | |
5673 | above. */ | |
5674 | if (thread_still_needs_step_over (tp)) | |
5675 | { | |
5676 | internal_error (__FILE__, __LINE__, | |
5677 | "thread [%s] needs a step-over, but not in " | |
5678 | "step-over queue\n", | |
a068643d | 5679 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5680 | } |
5681 | ||
5682 | if (currently_stepping (tp)) | |
5683 | { | |
5684 | if (debug_infrun) | |
5685 | fprintf_unfiltered (gdb_stdlog, | |
5686 | "infrun: restart threads: [%s] was stepping\n", | |
a068643d | 5687 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5688 | keep_going_stepped_thread (tp); |
5689 | } | |
5690 | else | |
5691 | { | |
5692 | struct execution_control_state ecss; | |
5693 | struct execution_control_state *ecs = &ecss; | |
5694 | ||
5695 | if (debug_infrun) | |
5696 | fprintf_unfiltered (gdb_stdlog, | |
5697 | "infrun: restart threads: [%s] continuing\n", | |
a068643d | 5698 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 | 5699 | reset_ecs (ecs, tp); |
00431a78 | 5700 | switch_to_thread (tp); |
372316f1 PA |
5701 | keep_going_pass_signal (ecs); |
5702 | } | |
5703 | } | |
5704 | } | |
5705 | ||
5706 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5707 | a pending waitstatus. */ | |
5708 | ||
5709 | static int | |
5710 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5711 | void *arg) | |
5712 | { | |
5713 | return (tp->resumed | |
5714 | && tp->suspend.waitstatus_pending_p); | |
5715 | } | |
5716 | ||
5717 | /* Called when we get an event that may finish an in-line or | |
5718 | out-of-line (displaced stepping) step-over started previously. | |
5719 | Return true if the event is processed and we should go back to the | |
5720 | event loop; false if the caller should continue processing the | |
5721 | event. */ | |
5722 | ||
5723 | static int | |
4d9d9d04 PA |
5724 | finish_step_over (struct execution_control_state *ecs) |
5725 | { | |
372316f1 PA |
5726 | int had_step_over_info; |
5727 | ||
00431a78 | 5728 | displaced_step_fixup (ecs->event_thread, |
4d9d9d04 PA |
5729 | ecs->event_thread->suspend.stop_signal); |
5730 | ||
372316f1 PA |
5731 | had_step_over_info = step_over_info_valid_p (); |
5732 | ||
5733 | if (had_step_over_info) | |
4d9d9d04 PA |
5734 | { |
5735 | /* If we're stepping over a breakpoint with all threads locked, | |
5736 | then only the thread that was stepped should be reporting | |
5737 | back an event. */ | |
5738 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5739 | ||
c65d6b55 | 5740 | clear_step_over_info (); |
4d9d9d04 PA |
5741 | } |
5742 | ||
fbea99ea | 5743 | if (!target_is_non_stop_p ()) |
372316f1 | 5744 | return 0; |
4d9d9d04 PA |
5745 | |
5746 | /* Start a new step-over in another thread if there's one that | |
5747 | needs it. */ | |
5748 | start_step_over (); | |
372316f1 PA |
5749 | |
5750 | /* If we were stepping over a breakpoint before, and haven't started | |
5751 | a new in-line step-over sequence, then restart all other threads | |
5752 | (except the event thread). We can't do this in all-stop, as then | |
5753 | e.g., we wouldn't be able to issue any other remote packet until | |
5754 | these other threads stop. */ | |
5755 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5756 | { | |
5757 | struct thread_info *pending; | |
5758 | ||
5759 | /* If we only have threads with pending statuses, the restart | |
5760 | below won't restart any thread and so nothing re-inserts the | |
5761 | breakpoint we just stepped over. But we need it inserted | |
5762 | when we later process the pending events, otherwise if | |
5763 | another thread has a pending event for this breakpoint too, | |
5764 | we'd discard its event (because the breakpoint that | |
5765 | originally caused the event was no longer inserted). */ | |
00431a78 | 5766 | context_switch (ecs); |
372316f1 PA |
5767 | insert_breakpoints (); |
5768 | ||
5769 | restart_threads (ecs->event_thread); | |
5770 | ||
5771 | /* If we have events pending, go through handle_inferior_event | |
5772 | again, picking up a pending event at random. This avoids | |
5773 | thread starvation. */ | |
5774 | ||
5775 | /* But not if we just stepped over a watchpoint in order to let | |
5776 | the instruction execute so we can evaluate its expression. | |
5777 | The set of watchpoints that triggered is recorded in the | |
5778 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5779 | If we processed another event first, that other event could | |
5780 | clobber this info. */ | |
5781 | if (ecs->event_thread->stepping_over_watchpoint) | |
5782 | return 0; | |
5783 | ||
5784 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5785 | NULL); | |
5786 | if (pending != NULL) | |
5787 | { | |
5788 | struct thread_info *tp = ecs->event_thread; | |
5789 | struct regcache *regcache; | |
5790 | ||
5791 | if (debug_infrun) | |
5792 | { | |
5793 | fprintf_unfiltered (gdb_stdlog, | |
5794 | "infrun: found resumed threads with " | |
5795 | "pending events, saving status\n"); | |
5796 | } | |
5797 | ||
5798 | gdb_assert (pending != tp); | |
5799 | ||
5800 | /* Record the event thread's event for later. */ | |
5801 | save_waitstatus (tp, &ecs->ws); | |
5802 | /* This was cleared early, by handle_inferior_event. Set it | |
5803 | so this pending event is considered by | |
5804 | do_target_wait. */ | |
719546c4 | 5805 | tp->resumed = true; |
372316f1 PA |
5806 | |
5807 | gdb_assert (!tp->executing); | |
5808 | ||
00431a78 | 5809 | regcache = get_thread_regcache (tp); |
372316f1 PA |
5810 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
5811 | ||
5812 | if (debug_infrun) | |
5813 | { | |
5814 | fprintf_unfiltered (gdb_stdlog, | |
5815 | "infrun: saved stop_pc=%s for %s " | |
5816 | "(currently_stepping=%d)\n", | |
5817 | paddress (target_gdbarch (), | |
5818 | tp->suspend.stop_pc), | |
a068643d | 5819 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
5820 | currently_stepping (tp)); |
5821 | } | |
5822 | ||
5823 | /* This in-line step-over finished; clear this so we won't | |
5824 | start a new one. This is what handle_signal_stop would | |
5825 | do, if we returned false. */ | |
5826 | tp->stepping_over_breakpoint = 0; | |
5827 | ||
5828 | /* Wake up the event loop again. */ | |
5829 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5830 | ||
5831 | prepare_to_wait (ecs); | |
5832 | return 1; | |
5833 | } | |
5834 | } | |
5835 | ||
5836 | return 0; | |
4d9d9d04 PA |
5837 | } |
5838 | ||
4f5d7f63 PA |
5839 | /* Come here when the program has stopped with a signal. */ |
5840 | ||
5841 | static void | |
5842 | handle_signal_stop (struct execution_control_state *ecs) | |
5843 | { | |
5844 | struct frame_info *frame; | |
5845 | struct gdbarch *gdbarch; | |
5846 | int stopped_by_watchpoint; | |
5847 | enum stop_kind stop_soon; | |
5848 | int random_signal; | |
c906108c | 5849 | |
f0407826 DE |
5850 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5851 | ||
c65d6b55 PA |
5852 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5853 | ||
f0407826 DE |
5854 | /* Do we need to clean up the state of a thread that has |
5855 | completed a displaced single-step? (Doing so usually affects | |
5856 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5857 | if (finish_step_over (ecs)) |
5858 | return; | |
f0407826 DE |
5859 | |
5860 | /* If we either finished a single-step or hit a breakpoint, but | |
5861 | the user wanted this thread to be stopped, pretend we got a | |
5862 | SIG0 (generic unsignaled stop). */ | |
5863 | if (ecs->event_thread->stop_requested | |
5864 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5865 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5866 | |
f2ffa92b PA |
5867 | ecs->event_thread->suspend.stop_pc |
5868 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 5869 | |
527159b7 | 5870 | if (debug_infrun) |
237fc4c9 | 5871 | { |
00431a78 | 5872 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 5873 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 5874 | |
f3f8ece4 | 5875 | switch_to_thread (ecs->event_thread); |
5af949e3 UW |
5876 | |
5877 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
b926417a | 5878 | paddress (reg_gdbarch, |
f2ffa92b | 5879 | ecs->event_thread->suspend.stop_pc)); |
d92524f1 | 5880 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5881 | { |
5882 | CORE_ADDR addr; | |
abbb1732 | 5883 | |
237fc4c9 PA |
5884 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
5885 | ||
8b88a78e | 5886 | if (target_stopped_data_address (current_top_target (), &addr)) |
237fc4c9 | 5887 | fprintf_unfiltered (gdb_stdlog, |
5af949e3 | 5888 | "infrun: stopped data address = %s\n", |
b926417a | 5889 | paddress (reg_gdbarch, addr)); |
237fc4c9 PA |
5890 | else |
5891 | fprintf_unfiltered (gdb_stdlog, | |
5892 | "infrun: (no data address available)\n"); | |
5893 | } | |
5894 | } | |
527159b7 | 5895 | |
36fa8042 PA |
5896 | /* This is originated from start_remote(), start_inferior() and |
5897 | shared libraries hook functions. */ | |
00431a78 | 5898 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
5899 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
5900 | { | |
00431a78 | 5901 | context_switch (ecs); |
36fa8042 PA |
5902 | if (debug_infrun) |
5903 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
5904 | stop_print_frame = 1; | |
22bcd14b | 5905 | stop_waiting (ecs); |
36fa8042 PA |
5906 | return; |
5907 | } | |
5908 | ||
36fa8042 PA |
5909 | /* This originates from attach_command(). We need to overwrite |
5910 | the stop_signal here, because some kernels don't ignore a | |
5911 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5912 | See more comments in inferior.h. On the other hand, if we | |
5913 | get a non-SIGSTOP, report it to the user - assume the backend | |
5914 | will handle the SIGSTOP if it should show up later. | |
5915 | ||
5916 | Also consider that the attach is complete when we see a | |
5917 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5918 | target extended-remote report it instead of a SIGSTOP | |
5919 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5920 | signal, so this is no exception. | |
5921 | ||
5922 | Also consider that the attach is complete when we see a | |
5923 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5924 | the target to stop all threads of the inferior, in case the | |
5925 | low level attach operation doesn't stop them implicitly. If | |
5926 | they weren't stopped implicitly, then the stub will report a | |
5927 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5928 | other than GDB's request. */ | |
5929 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5930 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5931 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5932 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5933 | { | |
5934 | stop_print_frame = 1; | |
22bcd14b | 5935 | stop_waiting (ecs); |
36fa8042 PA |
5936 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5937 | return; | |
5938 | } | |
5939 | ||
488f131b | 5940 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 | 5941 | so, then switch to that thread. */ |
d7e15655 | 5942 | if (ecs->ptid != inferior_ptid) |
488f131b | 5943 | { |
527159b7 | 5944 | if (debug_infrun) |
8a9de0e4 | 5945 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 5946 | |
00431a78 | 5947 | context_switch (ecs); |
c5aa993b | 5948 | |
9a4105ab | 5949 | if (deprecated_context_hook) |
00431a78 | 5950 | deprecated_context_hook (ecs->event_thread->global_num); |
488f131b | 5951 | } |
c906108c | 5952 | |
568d6575 UW |
5953 | /* At this point, get hold of the now-current thread's frame. */ |
5954 | frame = get_current_frame (); | |
5955 | gdbarch = get_frame_arch (frame); | |
5956 | ||
2adfaa28 | 5957 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5958 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5959 | { |
af48d08f | 5960 | struct regcache *regcache; |
af48d08f | 5961 | CORE_ADDR pc; |
2adfaa28 | 5962 | |
00431a78 | 5963 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
5964 | const address_space *aspace = regcache->aspace (); |
5965 | ||
af48d08f | 5966 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 5967 | |
af48d08f PA |
5968 | /* However, before doing so, if this single-step breakpoint was |
5969 | actually for another thread, set this thread up for moving | |
5970 | past it. */ | |
5971 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5972 | aspace, pc)) | |
5973 | { | |
5974 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
5975 | { |
5976 | if (debug_infrun) | |
5977 | { | |
5978 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 5979 | "infrun: [%s] hit another thread's " |
34b7e8a6 | 5980 | "single-step breakpoint\n", |
a068643d | 5981 | target_pid_to_str (ecs->ptid).c_str ()); |
2adfaa28 | 5982 | } |
af48d08f PA |
5983 | ecs->hit_singlestep_breakpoint = 1; |
5984 | } | |
5985 | } | |
5986 | else | |
5987 | { | |
5988 | if (debug_infrun) | |
5989 | { | |
5990 | fprintf_unfiltered (gdb_stdlog, | |
5991 | "infrun: [%s] hit its " | |
5992 | "single-step breakpoint\n", | |
a068643d | 5993 | target_pid_to_str (ecs->ptid).c_str ()); |
2adfaa28 PA |
5994 | } |
5995 | } | |
488f131b | 5996 | } |
af48d08f | 5997 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5998 | |
963f9c80 PA |
5999 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
6000 | && ecs->event_thread->control.trap_expected | |
6001 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
6002 | stopped_by_watchpoint = 0; |
6003 | else | |
6004 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
6005 | ||
6006 | /* If necessary, step over this watchpoint. We'll be back to display | |
6007 | it in a moment. */ | |
6008 | if (stopped_by_watchpoint | |
d92524f1 | 6009 | && (target_have_steppable_watchpoint |
568d6575 | 6010 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 6011 | { |
488f131b JB |
6012 | /* At this point, we are stopped at an instruction which has |
6013 | attempted to write to a piece of memory under control of | |
6014 | a watchpoint. The instruction hasn't actually executed | |
6015 | yet. If we were to evaluate the watchpoint expression | |
6016 | now, we would get the old value, and therefore no change | |
6017 | would seem to have occurred. | |
6018 | ||
6019 | In order to make watchpoints work `right', we really need | |
6020 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
6021 | watchpoint expression. We do this by single-stepping the |
6022 | target. | |
6023 | ||
7f89fd65 | 6024 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
6025 | it. For example, the PA can (with some kernel cooperation) |
6026 | single step over a watchpoint without disabling the watchpoint. | |
6027 | ||
6028 | It is far more common to need to disable a watchpoint to step | |
6029 | the inferior over it. If we have non-steppable watchpoints, | |
6030 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
6031 | disable all watchpoints. |
6032 | ||
6033 | Any breakpoint at PC must also be stepped over -- if there's | |
6034 | one, it will have already triggered before the watchpoint | |
6035 | triggered, and we either already reported it to the user, or | |
6036 | it didn't cause a stop and we called keep_going. In either | |
6037 | case, if there was a breakpoint at PC, we must be trying to | |
6038 | step past it. */ | |
6039 | ecs->event_thread->stepping_over_watchpoint = 1; | |
6040 | keep_going (ecs); | |
488f131b JB |
6041 | return; |
6042 | } | |
6043 | ||
4e1c45ea | 6044 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 6045 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
6046 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
6047 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 6048 | stop_print_frame = 1; |
488f131b | 6049 | stopped_by_random_signal = 0; |
ddfe970e | 6050 | bpstat stop_chain = NULL; |
488f131b | 6051 | |
edb3359d DJ |
6052 | /* Hide inlined functions starting here, unless we just performed stepi or |
6053 | nexti. After stepi and nexti, always show the innermost frame (not any | |
6054 | inline function call sites). */ | |
16c381f0 | 6055 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 6056 | { |
00431a78 PA |
6057 | const address_space *aspace |
6058 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
6059 | |
6060 | /* skip_inline_frames is expensive, so we avoid it if we can | |
6061 | determine that the address is one where functions cannot have | |
6062 | been inlined. This improves performance with inferiors that | |
6063 | load a lot of shared libraries, because the solib event | |
6064 | breakpoint is defined as the address of a function (i.e. not | |
6065 | inline). Note that we have to check the previous PC as well | |
6066 | as the current one to catch cases when we have just | |
6067 | single-stepped off a breakpoint prior to reinstating it. | |
6068 | Note that we're assuming that the code we single-step to is | |
6069 | not inline, but that's not definitive: there's nothing | |
6070 | preventing the event breakpoint function from containing | |
6071 | inlined code, and the single-step ending up there. If the | |
6072 | user had set a breakpoint on that inlined code, the missing | |
6073 | skip_inline_frames call would break things. Fortunately | |
6074 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
6075 | if (!pc_at_non_inline_function (aspace, |
6076 | ecs->event_thread->suspend.stop_pc, | |
6077 | &ecs->ws) | |
a210c238 MR |
6078 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
6079 | && ecs->event_thread->control.trap_expected | |
6080 | && pc_at_non_inline_function (aspace, | |
6081 | ecs->event_thread->prev_pc, | |
09ac7c10 | 6082 | &ecs->ws))) |
1c5a993e | 6083 | { |
f2ffa92b PA |
6084 | stop_chain = build_bpstat_chain (aspace, |
6085 | ecs->event_thread->suspend.stop_pc, | |
6086 | &ecs->ws); | |
00431a78 | 6087 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
6088 | |
6089 | /* Re-fetch current thread's frame in case that invalidated | |
6090 | the frame cache. */ | |
6091 | frame = get_current_frame (); | |
6092 | gdbarch = get_frame_arch (frame); | |
6093 | } | |
0574c78f | 6094 | } |
edb3359d | 6095 | |
a493e3e2 | 6096 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 6097 | && ecs->event_thread->control.trap_expected |
568d6575 | 6098 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6099 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6100 | { |
b50d7442 | 6101 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6102 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6103 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6104 | with a delay slot. It needs to be stepped twice, once for |
6105 | the instruction and once for the delay slot. */ | |
6106 | int step_through_delay | |
568d6575 | 6107 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6108 | |
527159b7 | 6109 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 6110 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
6111 | if (ecs->event_thread->control.step_range_end == 0 |
6112 | && step_through_delay) | |
3352ef37 AC |
6113 | { |
6114 | /* The user issued a continue when stopped at a breakpoint. | |
6115 | Set up for another trap and get out of here. */ | |
4e1c45ea | 6116 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6117 | keep_going (ecs); |
6118 | return; | |
6119 | } | |
6120 | else if (step_through_delay) | |
6121 | { | |
6122 | /* The user issued a step when stopped at a breakpoint. | |
6123 | Maybe we should stop, maybe we should not - the delay | |
6124 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6125 | case, don't decide that here, just set |
6126 | ecs->stepping_over_breakpoint, making sure we | |
6127 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6128 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6129 | } |
6130 | } | |
6131 | ||
ab04a2af TT |
6132 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6133 | handles this event. */ | |
6134 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6135 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
6136 | ecs->event_thread->suspend.stop_pc, |
6137 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 6138 | |
ab04a2af TT |
6139 | /* Following in case break condition called a |
6140 | function. */ | |
6141 | stop_print_frame = 1; | |
73dd234f | 6142 | |
ab04a2af TT |
6143 | /* This is where we handle "moribund" watchpoints. Unlike |
6144 | software breakpoints traps, hardware watchpoint traps are | |
6145 | always distinguishable from random traps. If no high-level | |
6146 | watchpoint is associated with the reported stop data address | |
6147 | anymore, then the bpstat does not explain the signal --- | |
6148 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6149 | set. */ | |
6150 | ||
6151 | if (debug_infrun | |
6152 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 6153 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6154 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
6155 | && stopped_by_watchpoint) |
6156 | fprintf_unfiltered (gdb_stdlog, | |
6157 | "infrun: no user watchpoint explains " | |
6158 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 6159 | |
bac7d97b | 6160 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6161 | at one stage in the past included checks for an inferior |
6162 | function call's call dummy's return breakpoint. The original | |
6163 | comment, that went with the test, read: | |
03cebad2 | 6164 | |
ab04a2af TT |
6165 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6166 | another signal besides SIGTRAP, so check here as well as | |
6167 | above.'' | |
73dd234f | 6168 | |
ab04a2af TT |
6169 | If someone ever tries to get call dummys on a |
6170 | non-executable stack to work (where the target would stop | |
6171 | with something like a SIGSEGV), then those tests might need | |
6172 | to be re-instated. Given, however, that the tests were only | |
6173 | enabled when momentary breakpoints were not being used, I | |
6174 | suspect that it won't be the case. | |
488f131b | 6175 | |
ab04a2af TT |
6176 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6177 | be necessary for call dummies on a non-executable stack on | |
6178 | SPARC. */ | |
488f131b | 6179 | |
bac7d97b | 6180 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6181 | random_signal |
6182 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
6183 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 6184 | |
1cf4d951 PA |
6185 | /* Maybe this was a trap for a software breakpoint that has since |
6186 | been removed. */ | |
6187 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6188 | { | |
5133a315 LM |
6189 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
6190 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
6191 | { |
6192 | struct regcache *regcache; | |
6193 | int decr_pc; | |
6194 | ||
6195 | /* Re-adjust PC to what the program would see if GDB was not | |
6196 | debugging it. */ | |
00431a78 | 6197 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6198 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6199 | if (decr_pc != 0) |
6200 | { | |
07036511 TT |
6201 | gdb::optional<scoped_restore_tmpl<int>> |
6202 | restore_operation_disable; | |
1cf4d951 PA |
6203 | |
6204 | if (record_full_is_used ()) | |
07036511 TT |
6205 | restore_operation_disable.emplace |
6206 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6207 | |
f2ffa92b PA |
6208 | regcache_write_pc (regcache, |
6209 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
6210 | } |
6211 | } | |
6212 | else | |
6213 | { | |
6214 | /* A delayed software breakpoint event. Ignore the trap. */ | |
6215 | if (debug_infrun) | |
6216 | fprintf_unfiltered (gdb_stdlog, | |
6217 | "infrun: delayed software breakpoint " | |
6218 | "trap, ignoring\n"); | |
6219 | random_signal = 0; | |
6220 | } | |
6221 | } | |
6222 | ||
6223 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6224 | has since been removed. */ | |
6225 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6226 | { | |
6227 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
6228 | if (debug_infrun) | |
6229 | fprintf_unfiltered (gdb_stdlog, | |
6230 | "infrun: delayed hardware breakpoint/watchpoint " | |
6231 | "trap, ignoring\n"); | |
6232 | random_signal = 0; | |
6233 | } | |
6234 | ||
bac7d97b PA |
6235 | /* If not, perhaps stepping/nexting can. */ |
6236 | if (random_signal) | |
6237 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6238 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6239 | |
2adfaa28 PA |
6240 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6241 | thread. Single-step breakpoints are transparent to the | |
6242 | breakpoints module. */ | |
6243 | if (random_signal) | |
6244 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6245 | ||
bac7d97b PA |
6246 | /* No? Perhaps we got a moribund watchpoint. */ |
6247 | if (random_signal) | |
6248 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6249 | |
c65d6b55 PA |
6250 | /* Always stop if the user explicitly requested this thread to |
6251 | remain stopped. */ | |
6252 | if (ecs->event_thread->stop_requested) | |
6253 | { | |
6254 | random_signal = 1; | |
6255 | if (debug_infrun) | |
6256 | fprintf_unfiltered (gdb_stdlog, "infrun: user-requested stop\n"); | |
6257 | } | |
6258 | ||
488f131b JB |
6259 | /* For the program's own signals, act according to |
6260 | the signal handling tables. */ | |
6261 | ||
ce12b012 | 6262 | if (random_signal) |
488f131b JB |
6263 | { |
6264 | /* Signal not for debugging purposes. */ | |
5b6d1e4f | 6265 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
c9737c08 | 6266 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6267 | |
527159b7 | 6268 | if (debug_infrun) |
c9737c08 PA |
6269 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
6270 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6271 | |
488f131b JB |
6272 | stopped_by_random_signal = 1; |
6273 | ||
252fbfc8 PA |
6274 | /* Always stop on signals if we're either just gaining control |
6275 | of the program, or the user explicitly requested this thread | |
6276 | to remain stopped. */ | |
d6b48e9c | 6277 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6278 | || ecs->event_thread->stop_requested |
24291992 | 6279 | || (!inf->detaching |
16c381f0 | 6280 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 6281 | { |
22bcd14b | 6282 | stop_waiting (ecs); |
488f131b JB |
6283 | return; |
6284 | } | |
b57bacec PA |
6285 | |
6286 | /* Notify observers the signal has "handle print" set. Note we | |
6287 | returned early above if stopping; normal_stop handles the | |
6288 | printing in that case. */ | |
6289 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6290 | { | |
6291 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6292 | target_terminal::ours_for_output (); |
76727919 | 6293 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 6294 | target_terminal::inferior (); |
b57bacec | 6295 | } |
488f131b JB |
6296 | |
6297 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6298 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6299 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6300 | |
f2ffa92b | 6301 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 6302 | && ecs->event_thread->control.trap_expected |
8358c15c | 6303 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6304 | { |
6305 | /* We were just starting a new sequence, attempting to | |
6306 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6307 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6308 | of the stepping range so GDB needs to remember to, when |
6309 | the signal handler returns, resume stepping off that | |
6310 | breakpoint. */ | |
6311 | /* To simplify things, "continue" is forced to use the same | |
6312 | code paths as single-step - set a breakpoint at the | |
6313 | signal return address and then, once hit, step off that | |
6314 | breakpoint. */ | |
237fc4c9 PA |
6315 | if (debug_infrun) |
6316 | fprintf_unfiltered (gdb_stdlog, | |
6317 | "infrun: signal arrived while stepping over " | |
6318 | "breakpoint\n"); | |
d3169d93 | 6319 | |
2c03e5be | 6320 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6321 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6322 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6323 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6324 | |
6325 | /* If we were nexting/stepping some other thread, switch to | |
6326 | it, so that we don't continue it, losing control. */ | |
6327 | if (!switch_back_to_stepped_thread (ecs)) | |
6328 | keep_going (ecs); | |
9d799f85 | 6329 | return; |
68f53502 | 6330 | } |
9d799f85 | 6331 | |
e5f8a7cc | 6332 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
6333 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6334 | ecs->event_thread) | |
e5f8a7cc | 6335 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 6336 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6337 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6338 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6339 | { |
6340 | /* The inferior is about to take a signal that will take it | |
6341 | out of the single step range. Set a breakpoint at the | |
6342 | current PC (which is presumably where the signal handler | |
6343 | will eventually return) and then allow the inferior to | |
6344 | run free. | |
6345 | ||
6346 | Note that this is only needed for a signal delivered | |
6347 | while in the single-step range. Nested signals aren't a | |
6348 | problem as they eventually all return. */ | |
237fc4c9 PA |
6349 | if (debug_infrun) |
6350 | fprintf_unfiltered (gdb_stdlog, | |
6351 | "infrun: signal may take us out of " | |
6352 | "single-step range\n"); | |
6353 | ||
372316f1 | 6354 | clear_step_over_info (); |
2c03e5be | 6355 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6356 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6357 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6358 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6359 | keep_going (ecs); |
6360 | return; | |
d303a6c7 | 6361 | } |
9d799f85 | 6362 | |
85102364 | 6363 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6364 | when either there's a nested signal, or when there's a |
6365 | pending signal enabled just as the signal handler returns | |
6366 | (leaving the inferior at the step-resume-breakpoint without | |
6367 | actually executing it). Either way continue until the | |
6368 | breakpoint is really hit. */ | |
c447ac0b PA |
6369 | |
6370 | if (!switch_back_to_stepped_thread (ecs)) | |
6371 | { | |
6372 | if (debug_infrun) | |
6373 | fprintf_unfiltered (gdb_stdlog, | |
6374 | "infrun: random signal, keep going\n"); | |
6375 | ||
6376 | keep_going (ecs); | |
6377 | } | |
6378 | return; | |
488f131b | 6379 | } |
94c57d6a PA |
6380 | |
6381 | process_event_stop_test (ecs); | |
6382 | } | |
6383 | ||
6384 | /* Come here when we've got some debug event / signal we can explain | |
6385 | (IOW, not a random signal), and test whether it should cause a | |
6386 | stop, or whether we should resume the inferior (transparently). | |
6387 | E.g., could be a breakpoint whose condition evaluates false; we | |
6388 | could be still stepping within the line; etc. */ | |
6389 | ||
6390 | static void | |
6391 | process_event_stop_test (struct execution_control_state *ecs) | |
6392 | { | |
6393 | struct symtab_and_line stop_pc_sal; | |
6394 | struct frame_info *frame; | |
6395 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6396 | CORE_ADDR jmp_buf_pc; |
6397 | struct bpstat_what what; | |
94c57d6a | 6398 | |
cdaa5b73 | 6399 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6400 | |
cdaa5b73 PA |
6401 | frame = get_current_frame (); |
6402 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6403 | |
cdaa5b73 | 6404 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6405 | |
cdaa5b73 PA |
6406 | if (what.call_dummy) |
6407 | { | |
6408 | stop_stack_dummy = what.call_dummy; | |
6409 | } | |
186c406b | 6410 | |
243a9253 PA |
6411 | /* A few breakpoint types have callbacks associated (e.g., |
6412 | bp_jit_event). Run them now. */ | |
6413 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6414 | ||
cdaa5b73 PA |
6415 | /* If we hit an internal event that triggers symbol changes, the |
6416 | current frame will be invalidated within bpstat_what (e.g., if we | |
6417 | hit an internal solib event). Re-fetch it. */ | |
6418 | frame = get_current_frame (); | |
6419 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6420 | |
cdaa5b73 PA |
6421 | switch (what.main_action) |
6422 | { | |
6423 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6424 | /* If we hit the breakpoint at longjmp while stepping, we | |
6425 | install a momentary breakpoint at the target of the | |
6426 | jmp_buf. */ | |
186c406b | 6427 | |
cdaa5b73 PA |
6428 | if (debug_infrun) |
6429 | fprintf_unfiltered (gdb_stdlog, | |
6430 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 6431 | |
cdaa5b73 | 6432 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6433 | |
cdaa5b73 PA |
6434 | if (what.is_longjmp) |
6435 | { | |
6436 | struct value *arg_value; | |
6437 | ||
6438 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6439 | then use it to extract the arguments. The destination PC | |
6440 | is the third argument to the probe. */ | |
6441 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6442 | if (arg_value) | |
8fa0c4f8 AA |
6443 | { |
6444 | jmp_buf_pc = value_as_address (arg_value); | |
6445 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6446 | } | |
cdaa5b73 PA |
6447 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6448 | || !gdbarch_get_longjmp_target (gdbarch, | |
6449 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6450 | { |
cdaa5b73 PA |
6451 | if (debug_infrun) |
6452 | fprintf_unfiltered (gdb_stdlog, | |
6453 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
6454 | "(!gdbarch_get_longjmp_target)\n"); | |
6455 | keep_going (ecs); | |
6456 | return; | |
e2e4d78b | 6457 | } |
e2e4d78b | 6458 | |
cdaa5b73 PA |
6459 | /* Insert a breakpoint at resume address. */ |
6460 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6461 | } | |
6462 | else | |
6463 | check_exception_resume (ecs, frame); | |
6464 | keep_going (ecs); | |
6465 | return; | |
e81a37f7 | 6466 | |
cdaa5b73 PA |
6467 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6468 | { | |
6469 | struct frame_info *init_frame; | |
e81a37f7 | 6470 | |
cdaa5b73 | 6471 | /* There are several cases to consider. |
c906108c | 6472 | |
cdaa5b73 PA |
6473 | 1. The initiating frame no longer exists. In this case we |
6474 | must stop, because the exception or longjmp has gone too | |
6475 | far. | |
2c03e5be | 6476 | |
cdaa5b73 PA |
6477 | 2. The initiating frame exists, and is the same as the |
6478 | current frame. We stop, because the exception or longjmp | |
6479 | has been caught. | |
2c03e5be | 6480 | |
cdaa5b73 PA |
6481 | 3. The initiating frame exists and is different from the |
6482 | current frame. This means the exception or longjmp has | |
6483 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6484 | |
cdaa5b73 PA |
6485 | 4. longjmp breakpoint has been placed just to protect |
6486 | against stale dummy frames and user is not interested in | |
6487 | stopping around longjmps. */ | |
c5aa993b | 6488 | |
cdaa5b73 PA |
6489 | if (debug_infrun) |
6490 | fprintf_unfiltered (gdb_stdlog, | |
6491 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 6492 | |
cdaa5b73 PA |
6493 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6494 | != NULL); | |
6495 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6496 | |
cdaa5b73 PA |
6497 | if (what.is_longjmp) |
6498 | { | |
b67a2c6f | 6499 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6500 | |
cdaa5b73 | 6501 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6502 | { |
cdaa5b73 PA |
6503 | /* Case 4. */ |
6504 | keep_going (ecs); | |
6505 | return; | |
e5ef252a | 6506 | } |
cdaa5b73 | 6507 | } |
c5aa993b | 6508 | |
cdaa5b73 | 6509 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6510 | |
cdaa5b73 PA |
6511 | if (init_frame) |
6512 | { | |
6513 | struct frame_id current_id | |
6514 | = get_frame_id (get_current_frame ()); | |
6515 | if (frame_id_eq (current_id, | |
6516 | ecs->event_thread->initiating_frame)) | |
6517 | { | |
6518 | /* Case 2. Fall through. */ | |
6519 | } | |
6520 | else | |
6521 | { | |
6522 | /* Case 3. */ | |
6523 | keep_going (ecs); | |
6524 | return; | |
6525 | } | |
68f53502 | 6526 | } |
488f131b | 6527 | |
cdaa5b73 PA |
6528 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6529 | exists. */ | |
6530 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6531 | |
bdc36728 | 6532 | end_stepping_range (ecs); |
cdaa5b73 PA |
6533 | } |
6534 | return; | |
e5ef252a | 6535 | |
cdaa5b73 PA |
6536 | case BPSTAT_WHAT_SINGLE: |
6537 | if (debug_infrun) | |
6538 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
6539 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6540 | /* Still need to check other stuff, at least the case where we | |
6541 | are stepping and step out of the right range. */ | |
6542 | break; | |
e5ef252a | 6543 | |
cdaa5b73 PA |
6544 | case BPSTAT_WHAT_STEP_RESUME: |
6545 | if (debug_infrun) | |
6546 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 6547 | |
cdaa5b73 PA |
6548 | delete_step_resume_breakpoint (ecs->event_thread); |
6549 | if (ecs->event_thread->control.proceed_to_finish | |
6550 | && execution_direction == EXEC_REVERSE) | |
6551 | { | |
6552 | struct thread_info *tp = ecs->event_thread; | |
6553 | ||
6554 | /* We are finishing a function in reverse, and just hit the | |
6555 | step-resume breakpoint at the start address of the | |
6556 | function, and we're almost there -- just need to back up | |
6557 | by one more single-step, which should take us back to the | |
6558 | function call. */ | |
6559 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6560 | keep_going (ecs); | |
e5ef252a | 6561 | return; |
cdaa5b73 PA |
6562 | } |
6563 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6564 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6565 | && execution_direction == EXEC_REVERSE) |
6566 | { | |
6567 | /* We are stepping over a function call in reverse, and just | |
6568 | hit the step-resume breakpoint at the start address of | |
6569 | the function. Go back to single-stepping, which should | |
6570 | take us back to the function call. */ | |
6571 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6572 | keep_going (ecs); | |
6573 | return; | |
6574 | } | |
6575 | break; | |
e5ef252a | 6576 | |
cdaa5b73 PA |
6577 | case BPSTAT_WHAT_STOP_NOISY: |
6578 | if (debug_infrun) | |
6579 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
6580 | stop_print_frame = 1; | |
e5ef252a | 6581 | |
99619bea PA |
6582 | /* Assume the thread stopped for a breapoint. We'll still check |
6583 | whether a/the breakpoint is there when the thread is next | |
6584 | resumed. */ | |
6585 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6586 | |
22bcd14b | 6587 | stop_waiting (ecs); |
cdaa5b73 | 6588 | return; |
e5ef252a | 6589 | |
cdaa5b73 PA |
6590 | case BPSTAT_WHAT_STOP_SILENT: |
6591 | if (debug_infrun) | |
6592 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
6593 | stop_print_frame = 0; | |
e5ef252a | 6594 | |
99619bea PA |
6595 | /* Assume the thread stopped for a breapoint. We'll still check |
6596 | whether a/the breakpoint is there when the thread is next | |
6597 | resumed. */ | |
6598 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6599 | stop_waiting (ecs); |
cdaa5b73 PA |
6600 | return; |
6601 | ||
6602 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
6603 | if (debug_infrun) | |
6604 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
6605 | ||
6606 | delete_step_resume_breakpoint (ecs->event_thread); | |
6607 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6608 | { | |
6609 | /* Back when the step-resume breakpoint was inserted, we | |
6610 | were trying to single-step off a breakpoint. Go back to | |
6611 | doing that. */ | |
6612 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6613 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6614 | keep_going (ecs); | |
6615 | return; | |
e5ef252a | 6616 | } |
cdaa5b73 PA |
6617 | break; |
6618 | ||
6619 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6620 | break; | |
e5ef252a | 6621 | } |
c906108c | 6622 | |
af48d08f PA |
6623 | /* If we stepped a permanent breakpoint and we had a high priority |
6624 | step-resume breakpoint for the address we stepped, but we didn't | |
6625 | hit it, then we must have stepped into the signal handler. The | |
6626 | step-resume was only necessary to catch the case of _not_ | |
6627 | stepping into the handler, so delete it, and fall through to | |
6628 | checking whether the step finished. */ | |
6629 | if (ecs->event_thread->stepped_breakpoint) | |
6630 | { | |
6631 | struct breakpoint *sr_bp | |
6632 | = ecs->event_thread->control.step_resume_breakpoint; | |
6633 | ||
8d707a12 PA |
6634 | if (sr_bp != NULL |
6635 | && sr_bp->loc->permanent | |
af48d08f PA |
6636 | && sr_bp->type == bp_hp_step_resume |
6637 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6638 | { | |
6639 | if (debug_infrun) | |
6640 | fprintf_unfiltered (gdb_stdlog, | |
6641 | "infrun: stepped permanent breakpoint, stopped in " | |
6642 | "handler\n"); | |
6643 | delete_step_resume_breakpoint (ecs->event_thread); | |
6644 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6645 | } | |
6646 | } | |
6647 | ||
cdaa5b73 PA |
6648 | /* We come here if we hit a breakpoint but should not stop for it. |
6649 | Possibly we also were stepping and should stop for that. So fall | |
6650 | through and test for stepping. But, if not stepping, do not | |
6651 | stop. */ | |
c906108c | 6652 | |
a7212384 UW |
6653 | /* In all-stop mode, if we're currently stepping but have stopped in |
6654 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6655 | if (switch_back_to_stepped_thread (ecs)) |
6656 | return; | |
776f04fa | 6657 | |
8358c15c | 6658 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6659 | { |
527159b7 | 6660 | if (debug_infrun) |
d3169d93 DJ |
6661 | fprintf_unfiltered (gdb_stdlog, |
6662 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 6663 | |
488f131b JB |
6664 | /* Having a step-resume breakpoint overrides anything |
6665 | else having to do with stepping commands until | |
6666 | that breakpoint is reached. */ | |
488f131b JB |
6667 | keep_going (ecs); |
6668 | return; | |
6669 | } | |
c5aa993b | 6670 | |
16c381f0 | 6671 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6672 | { |
527159b7 | 6673 | if (debug_infrun) |
8a9de0e4 | 6674 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 6675 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6676 | keep_going (ecs); |
6677 | return; | |
6678 | } | |
c5aa993b | 6679 | |
4b7703ad JB |
6680 | /* Re-fetch current thread's frame in case the code above caused |
6681 | the frame cache to be re-initialized, making our FRAME variable | |
6682 | a dangling pointer. */ | |
6683 | frame = get_current_frame (); | |
628fe4e4 | 6684 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6685 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6686 | |
488f131b | 6687 | /* If stepping through a line, keep going if still within it. |
c906108c | 6688 | |
488f131b JB |
6689 | Note that step_range_end is the address of the first instruction |
6690 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6691 | within it! |
6692 | ||
6693 | Note also that during reverse execution, we may be stepping | |
6694 | through a function epilogue and therefore must detect when | |
6695 | the current-frame changes in the middle of a line. */ | |
6696 | ||
f2ffa92b PA |
6697 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6698 | ecs->event_thread) | |
31410e84 | 6699 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6700 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6701 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6702 | { |
527159b7 | 6703 | if (debug_infrun) |
5af949e3 UW |
6704 | fprintf_unfiltered |
6705 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
6706 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
6707 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6708 | |
c1e36e3e PA |
6709 | /* Tentatively re-enable range stepping; `resume' disables it if |
6710 | necessary (e.g., if we're stepping over a breakpoint or we | |
6711 | have software watchpoints). */ | |
6712 | ecs->event_thread->control.may_range_step = 1; | |
6713 | ||
b2175913 MS |
6714 | /* When stepping backward, stop at beginning of line range |
6715 | (unless it's the function entry point, in which case | |
6716 | keep going back to the call point). */ | |
f2ffa92b | 6717 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6718 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6719 | && stop_pc != ecs->stop_func_start |
6720 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6721 | end_stepping_range (ecs); |
b2175913 MS |
6722 | else |
6723 | keep_going (ecs); | |
6724 | ||
488f131b JB |
6725 | return; |
6726 | } | |
c5aa993b | 6727 | |
488f131b | 6728 | /* We stepped out of the stepping range. */ |
c906108c | 6729 | |
488f131b | 6730 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6731 | loader dynamic symbol resolution code... |
6732 | ||
6733 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6734 | time loader code and reach the callee's address. | |
6735 | ||
6736 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6737 | the runtime loader code is handled just like any other | |
6738 | undebuggable function call. Now we need only keep stepping | |
6739 | backward through the trampoline code, and that's handled further | |
6740 | down, so there is nothing for us to do here. */ | |
6741 | ||
6742 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6743 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6744 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6745 | { |
4c8c40e6 | 6746 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6747 | gdbarch_skip_solib_resolver (gdbarch, |
6748 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6749 | |
527159b7 | 6750 | if (debug_infrun) |
3e43a32a MS |
6751 | fprintf_unfiltered (gdb_stdlog, |
6752 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 6753 | |
488f131b JB |
6754 | if (pc_after_resolver) |
6755 | { | |
6756 | /* Set up a step-resume breakpoint at the address | |
6757 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6758 | symtab_and_line sr_sal; |
488f131b | 6759 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6760 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6761 | |
a6d9a66e UW |
6762 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6763 | sr_sal, null_frame_id); | |
c5aa993b | 6764 | } |
c906108c | 6765 | |
488f131b JB |
6766 | keep_going (ecs); |
6767 | return; | |
6768 | } | |
c906108c | 6769 | |
1d509aa6 MM |
6770 | /* Step through an indirect branch thunk. */ |
6771 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6772 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6773 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 MM |
6774 | { |
6775 | if (debug_infrun) | |
6776 | fprintf_unfiltered (gdb_stdlog, | |
6777 | "infrun: stepped into indirect branch thunk\n"); | |
6778 | keep_going (ecs); | |
6779 | return; | |
6780 | } | |
6781 | ||
16c381f0 JK |
6782 | if (ecs->event_thread->control.step_range_end != 1 |
6783 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6784 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6785 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6786 | { |
527159b7 | 6787 | if (debug_infrun) |
3e43a32a MS |
6788 | fprintf_unfiltered (gdb_stdlog, |
6789 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 6790 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6791 | a signal trampoline (either by a signal being delivered or by |
6792 | the signal handler returning). Just single-step until the | |
6793 | inferior leaves the trampoline (either by calling the handler | |
6794 | or returning). */ | |
488f131b JB |
6795 | keep_going (ecs); |
6796 | return; | |
6797 | } | |
c906108c | 6798 | |
14132e89 MR |
6799 | /* If we're in the return path from a shared library trampoline, |
6800 | we want to proceed through the trampoline when stepping. */ | |
6801 | /* macro/2012-04-25: This needs to come before the subroutine | |
6802 | call check below as on some targets return trampolines look | |
6803 | like subroutine calls (MIPS16 return thunks). */ | |
6804 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
6805 | ecs->event_thread->suspend.stop_pc, |
6806 | ecs->stop_func_name) | |
14132e89 MR |
6807 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6808 | { | |
6809 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
6810 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6811 | CORE_ADDR real_stop_pc | |
6812 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 MR |
6813 | |
6814 | if (debug_infrun) | |
6815 | fprintf_unfiltered (gdb_stdlog, | |
6816 | "infrun: stepped into solib return tramp\n"); | |
6817 | ||
6818 | /* Only proceed through if we know where it's going. */ | |
6819 | if (real_stop_pc) | |
6820 | { | |
6821 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6822 | symtab_and_line sr_sal; |
14132e89 MR |
6823 | sr_sal.pc = real_stop_pc; |
6824 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6825 | sr_sal.pspace = get_frame_program_space (frame); | |
6826 | ||
6827 | /* Do not specify what the fp should be when we stop since | |
6828 | on some machines the prologue is where the new fp value | |
6829 | is established. */ | |
6830 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6831 | sr_sal, null_frame_id); | |
6832 | ||
6833 | /* Restart without fiddling with the step ranges or | |
6834 | other state. */ | |
6835 | keep_going (ecs); | |
6836 | return; | |
6837 | } | |
6838 | } | |
6839 | ||
c17eaafe DJ |
6840 | /* Check for subroutine calls. The check for the current frame |
6841 | equalling the step ID is not necessary - the check of the | |
6842 | previous frame's ID is sufficient - but it is a common case and | |
6843 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6844 | |
6845 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6846 | being equal, so to get into this block, both the current and | |
6847 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6848 | /* The outer_frame_id check is a heuristic to detect stepping |
6849 | through startup code. If we step over an instruction which | |
6850 | sets the stack pointer from an invalid value to a valid value, | |
6851 | we may detect that as a subroutine call from the mythical | |
6852 | "outermost" function. This could be fixed by marking | |
6853 | outermost frames as !stack_p,code_p,special_p. Then the | |
6854 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6855 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6856 | for more. */ |
edb3359d | 6857 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6858 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6859 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6860 | ecs->event_thread->control.step_stack_frame_id) |
6861 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6862 | outer_frame_id) |
885eeb5b | 6863 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 6864 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 6865 | { |
f2ffa92b | 6866 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 6867 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6868 | |
527159b7 | 6869 | if (debug_infrun) |
8a9de0e4 | 6870 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 6871 | |
b7a084be | 6872 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6873 | { |
6874 | /* I presume that step_over_calls is only 0 when we're | |
6875 | supposed to be stepping at the assembly language level | |
6876 | ("stepi"). Just stop. */ | |
388a8562 | 6877 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6878 | end_stepping_range (ecs); |
95918acb AC |
6879 | return; |
6880 | } | |
8fb3e588 | 6881 | |
388a8562 MS |
6882 | /* Reverse stepping through solib trampolines. */ |
6883 | ||
6884 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6885 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6886 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6887 | || (ecs->stop_func_start == 0 | |
6888 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6889 | { | |
6890 | /* Any solib trampoline code can be handled in reverse | |
6891 | by simply continuing to single-step. We have already | |
6892 | executed the solib function (backwards), and a few | |
6893 | steps will take us back through the trampoline to the | |
6894 | caller. */ | |
6895 | keep_going (ecs); | |
6896 | return; | |
6897 | } | |
6898 | ||
16c381f0 | 6899 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6900 | { |
b2175913 MS |
6901 | /* We're doing a "next". |
6902 | ||
6903 | Normal (forward) execution: set a breakpoint at the | |
6904 | callee's return address (the address at which the caller | |
6905 | will resume). | |
6906 | ||
6907 | Reverse (backward) execution. set the step-resume | |
6908 | breakpoint at the start of the function that we just | |
6909 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6910 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6911 | |
6912 | if (execution_direction == EXEC_REVERSE) | |
6913 | { | |
acf9414f JK |
6914 | /* If we're already at the start of the function, we've either |
6915 | just stepped backward into a single instruction function, | |
6916 | or stepped back out of a signal handler to the first instruction | |
6917 | of the function. Just keep going, which will single-step back | |
6918 | to the caller. */ | |
58c48e72 | 6919 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6920 | { |
acf9414f | 6921 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6922 | symtab_and_line sr_sal; |
acf9414f JK |
6923 | sr_sal.pc = ecs->stop_func_start; |
6924 | sr_sal.pspace = get_frame_program_space (frame); | |
6925 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6926 | sr_sal, null_frame_id); | |
6927 | } | |
b2175913 MS |
6928 | } |
6929 | else | |
568d6575 | 6930 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6931 | |
8567c30f AC |
6932 | keep_going (ecs); |
6933 | return; | |
6934 | } | |
a53c66de | 6935 | |
95918acb | 6936 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6937 | calling routine and the real function), locate the real |
6938 | function. That's what tells us (a) whether we want to step | |
6939 | into it at all, and (b) what prologue we want to run to the | |
6940 | end of, if we do step into it. */ | |
568d6575 | 6941 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6942 | if (real_stop_pc == 0) |
568d6575 | 6943 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6944 | if (real_stop_pc != 0) |
6945 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6946 | |
db5f024e | 6947 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6948 | { |
51abb421 | 6949 | symtab_and_line sr_sal; |
1b2bfbb9 | 6950 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6951 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6952 | |
a6d9a66e UW |
6953 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6954 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6955 | keep_going (ecs); |
6956 | return; | |
1b2bfbb9 RC |
6957 | } |
6958 | ||
95918acb | 6959 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6960 | thinking of stepping into and the function isn't on the skip |
6961 | list, step into it. | |
95918acb | 6962 | |
8fb3e588 AC |
6963 | If there are several symtabs at that PC (e.g. with include |
6964 | files), just want to know whether *any* of them have line | |
6965 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6966 | { |
6967 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6968 | |
95918acb | 6969 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6970 | if (tmp_sal.line != 0 |
85817405 | 6971 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
6972 | tmp_sal) |
6973 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 6974 | { |
b2175913 | 6975 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6976 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6977 | else |
568d6575 | 6978 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6979 | return; |
6980 | } | |
6981 | } | |
6982 | ||
6983 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6984 | set, we stop the step so that the user has a chance to switch |
6985 | in assembly mode. */ | |
16c381f0 | 6986 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6987 | && step_stop_if_no_debug) |
95918acb | 6988 | { |
bdc36728 | 6989 | end_stepping_range (ecs); |
95918acb AC |
6990 | return; |
6991 | } | |
6992 | ||
b2175913 MS |
6993 | if (execution_direction == EXEC_REVERSE) |
6994 | { | |
acf9414f JK |
6995 | /* If we're already at the start of the function, we've either just |
6996 | stepped backward into a single instruction function without line | |
6997 | number info, or stepped back out of a signal handler to the first | |
6998 | instruction of the function without line number info. Just keep | |
6999 | going, which will single-step back to the caller. */ | |
7000 | if (ecs->stop_func_start != stop_pc) | |
7001 | { | |
7002 | /* Set a breakpoint at callee's start address. | |
7003 | From there we can step once and be back in the caller. */ | |
51abb421 | 7004 | symtab_and_line sr_sal; |
acf9414f JK |
7005 | sr_sal.pc = ecs->stop_func_start; |
7006 | sr_sal.pspace = get_frame_program_space (frame); | |
7007 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7008 | sr_sal, null_frame_id); | |
7009 | } | |
b2175913 MS |
7010 | } |
7011 | else | |
7012 | /* Set a breakpoint at callee's return address (the address | |
7013 | at which the caller will resume). */ | |
568d6575 | 7014 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7015 | |
95918acb | 7016 | keep_going (ecs); |
488f131b | 7017 | return; |
488f131b | 7018 | } |
c906108c | 7019 | |
fdd654f3 MS |
7020 | /* Reverse stepping through solib trampolines. */ |
7021 | ||
7022 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 7023 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 7024 | { |
f2ffa92b PA |
7025 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
7026 | ||
fdd654f3 MS |
7027 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
7028 | || (ecs->stop_func_start == 0 | |
7029 | && in_solib_dynsym_resolve_code (stop_pc))) | |
7030 | { | |
7031 | /* Any solib trampoline code can be handled in reverse | |
7032 | by simply continuing to single-step. We have already | |
7033 | executed the solib function (backwards), and a few | |
7034 | steps will take us back through the trampoline to the | |
7035 | caller. */ | |
7036 | keep_going (ecs); | |
7037 | return; | |
7038 | } | |
7039 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
7040 | { | |
7041 | /* Stepped backward into the solib dynsym resolver. | |
7042 | Set a breakpoint at its start and continue, then | |
7043 | one more step will take us out. */ | |
51abb421 | 7044 | symtab_and_line sr_sal; |
fdd654f3 | 7045 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 7046 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
7047 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7048 | sr_sal, null_frame_id); | |
7049 | keep_going (ecs); | |
7050 | return; | |
7051 | } | |
7052 | } | |
7053 | ||
8c95582d AB |
7054 | /* This always returns the sal for the inner-most frame when we are in a |
7055 | stack of inlined frames, even if GDB actually believes that it is in a | |
7056 | more outer frame. This is checked for below by calls to | |
7057 | inline_skipped_frames. */ | |
f2ffa92b | 7058 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 7059 | |
1b2bfbb9 RC |
7060 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
7061 | the trampoline processing logic, however, there are some trampolines | |
7062 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 7063 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 7064 | && ecs->stop_func_name == NULL |
2afb61aa | 7065 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 7066 | { |
527159b7 | 7067 | if (debug_infrun) |
3e43a32a MS |
7068 | fprintf_unfiltered (gdb_stdlog, |
7069 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 7070 | |
1b2bfbb9 | 7071 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
7072 | undebuggable function (where there is no debugging information |
7073 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
7074 | inferior stopped). Since we want to skip this kind of code, |
7075 | we keep going until the inferior returns from this | |
14e60db5 DJ |
7076 | function - unless the user has asked us not to (via |
7077 | set step-mode) or we no longer know how to get back | |
7078 | to the call site. */ | |
7079 | if (step_stop_if_no_debug | |
c7ce8faa | 7080 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
7081 | { |
7082 | /* If we have no line number and the step-stop-if-no-debug | |
7083 | is set, we stop the step so that the user has a chance to | |
7084 | switch in assembly mode. */ | |
bdc36728 | 7085 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7086 | return; |
7087 | } | |
7088 | else | |
7089 | { | |
7090 | /* Set a breakpoint at callee's return address (the address | |
7091 | at which the caller will resume). */ | |
568d6575 | 7092 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
7093 | keep_going (ecs); |
7094 | return; | |
7095 | } | |
7096 | } | |
7097 | ||
16c381f0 | 7098 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
7099 | { |
7100 | /* It is stepi or nexti. We always want to stop stepping after | |
7101 | one instruction. */ | |
527159b7 | 7102 | if (debug_infrun) |
8a9de0e4 | 7103 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 7104 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7105 | return; |
7106 | } | |
7107 | ||
2afb61aa | 7108 | if (stop_pc_sal.line == 0) |
488f131b JB |
7109 | { |
7110 | /* We have no line number information. That means to stop | |
7111 | stepping (does this always happen right after one instruction, | |
7112 | when we do "s" in a function with no line numbers, | |
7113 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 7114 | if (debug_infrun) |
8a9de0e4 | 7115 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 7116 | end_stepping_range (ecs); |
488f131b JB |
7117 | return; |
7118 | } | |
c906108c | 7119 | |
edb3359d DJ |
7120 | /* Look for "calls" to inlined functions, part one. If the inline |
7121 | frame machinery detected some skipped call sites, we have entered | |
7122 | a new inline function. */ | |
7123 | ||
7124 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7125 | ecs->event_thread->control.step_frame_id) |
00431a78 | 7126 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 7127 | { |
edb3359d DJ |
7128 | if (debug_infrun) |
7129 | fprintf_unfiltered (gdb_stdlog, | |
7130 | "infrun: stepped into inlined function\n"); | |
7131 | ||
51abb421 | 7132 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 7133 | |
16c381f0 | 7134 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
7135 | { |
7136 | /* For "step", we're going to stop. But if the call site | |
7137 | for this inlined function is on the same source line as | |
7138 | we were previously stepping, go down into the function | |
7139 | first. Otherwise stop at the call site. */ | |
7140 | ||
7141 | if (call_sal.line == ecs->event_thread->current_line | |
7142 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7143 | { |
7144 | step_into_inline_frame (ecs->event_thread); | |
7145 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7146 | { | |
7147 | keep_going (ecs); | |
7148 | return; | |
7149 | } | |
7150 | } | |
edb3359d | 7151 | |
bdc36728 | 7152 | end_stepping_range (ecs); |
edb3359d DJ |
7153 | return; |
7154 | } | |
7155 | else | |
7156 | { | |
7157 | /* For "next", we should stop at the call site if it is on a | |
7158 | different source line. Otherwise continue through the | |
7159 | inlined function. */ | |
7160 | if (call_sal.line == ecs->event_thread->current_line | |
7161 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7162 | keep_going (ecs); | |
7163 | else | |
bdc36728 | 7164 | end_stepping_range (ecs); |
edb3359d DJ |
7165 | return; |
7166 | } | |
7167 | } | |
7168 | ||
7169 | /* Look for "calls" to inlined functions, part two. If we are still | |
7170 | in the same real function we were stepping through, but we have | |
7171 | to go further up to find the exact frame ID, we are stepping | |
7172 | through a more inlined call beyond its call site. */ | |
7173 | ||
7174 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
7175 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7176 | ecs->event_thread->control.step_frame_id) |
edb3359d | 7177 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7178 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
7179 | { |
7180 | if (debug_infrun) | |
7181 | fprintf_unfiltered (gdb_stdlog, | |
7182 | "infrun: stepping through inlined function\n"); | |
7183 | ||
4a4c04f1 BE |
7184 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7185 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7186 | keep_going (ecs); |
7187 | else | |
bdc36728 | 7188 | end_stepping_range (ecs); |
edb3359d DJ |
7189 | return; |
7190 | } | |
7191 | ||
8c95582d | 7192 | bool refresh_step_info = true; |
f2ffa92b | 7193 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
7194 | && (ecs->event_thread->current_line != stop_pc_sal.line |
7195 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b | 7196 | { |
8c95582d AB |
7197 | if (stop_pc_sal.is_stmt) |
7198 | { | |
7199 | /* We are at the start of a different line. So stop. Note that | |
7200 | we don't stop if we step into the middle of a different line. | |
7201 | That is said to make things like for (;;) statements work | |
7202 | better. */ | |
7203 | if (debug_infrun) | |
7204 | fprintf_unfiltered (gdb_stdlog, | |
7205 | "infrun: stepped to a different line\n"); | |
7206 | end_stepping_range (ecs); | |
7207 | return; | |
7208 | } | |
7209 | else if (frame_id_eq (get_frame_id (get_current_frame ()), | |
7210 | ecs->event_thread->control.step_frame_id)) | |
7211 | { | |
7212 | /* We are at the start of a different line, however, this line is | |
7213 | not marked as a statement, and we have not changed frame. We | |
7214 | ignore this line table entry, and continue stepping forward, | |
7215 | looking for a better place to stop. */ | |
7216 | refresh_step_info = false; | |
7217 | if (debug_infrun) | |
7218 | fprintf_unfiltered (gdb_stdlog, | |
7219 | "infrun: stepped to a different line, but " | |
7220 | "it's not the start of a statement\n"); | |
7221 | } | |
488f131b | 7222 | } |
c906108c | 7223 | |
488f131b | 7224 | /* We aren't done stepping. |
c906108c | 7225 | |
488f131b JB |
7226 | Optimize by setting the stepping range to the line. |
7227 | (We might not be in the original line, but if we entered a | |
7228 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7229 | things like for(;;) statements work better.) |
7230 | ||
7231 | If we entered a SAL that indicates a non-statement line table entry, | |
7232 | then we update the stepping range, but we don't update the step info, | |
7233 | which includes things like the line number we are stepping away from. | |
7234 | This means we will stop when we find a line table entry that is marked | |
7235 | as is-statement, even if it matches the non-statement one we just | |
7236 | stepped into. */ | |
c906108c | 7237 | |
16c381f0 JK |
7238 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7239 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7240 | ecs->event_thread->control.may_range_step = 1; |
8c95582d AB |
7241 | if (refresh_step_info) |
7242 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7243 | |
527159b7 | 7244 | if (debug_infrun) |
8a9de0e4 | 7245 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 7246 | keep_going (ecs); |
104c1213 JM |
7247 | } |
7248 | ||
c447ac0b PA |
7249 | /* In all-stop mode, if we're currently stepping but have stopped in |
7250 | some other thread, we may need to switch back to the stepped | |
7251 | thread. Returns true we set the inferior running, false if we left | |
7252 | it stopped (and the event needs further processing). */ | |
7253 | ||
7254 | static int | |
7255 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
7256 | { | |
fbea99ea | 7257 | if (!target_is_non_stop_p ()) |
c447ac0b | 7258 | { |
99619bea PA |
7259 | struct thread_info *stepping_thread; |
7260 | ||
7261 | /* If any thread is blocked on some internal breakpoint, and we | |
7262 | simply need to step over that breakpoint to get it going | |
7263 | again, do that first. */ | |
7264 | ||
7265 | /* However, if we see an event for the stepping thread, then we | |
7266 | know all other threads have been moved past their breakpoints | |
7267 | already. Let the caller check whether the step is finished, | |
7268 | etc., before deciding to move it past a breakpoint. */ | |
7269 | if (ecs->event_thread->control.step_range_end != 0) | |
7270 | return 0; | |
7271 | ||
7272 | /* Check if the current thread is blocked on an incomplete | |
7273 | step-over, interrupted by a random signal. */ | |
7274 | if (ecs->event_thread->control.trap_expected | |
7275 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7276 | { |
99619bea PA |
7277 | if (debug_infrun) |
7278 | { | |
7279 | fprintf_unfiltered (gdb_stdlog, | |
7280 | "infrun: need to finish step-over of [%s]\n", | |
a068643d | 7281 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); |
99619bea PA |
7282 | } |
7283 | keep_going (ecs); | |
7284 | return 1; | |
7285 | } | |
2adfaa28 | 7286 | |
99619bea PA |
7287 | /* Check if the current thread is blocked by a single-step |
7288 | breakpoint of another thread. */ | |
7289 | if (ecs->hit_singlestep_breakpoint) | |
7290 | { | |
7291 | if (debug_infrun) | |
7292 | { | |
7293 | fprintf_unfiltered (gdb_stdlog, | |
7294 | "infrun: need to step [%s] over single-step " | |
7295 | "breakpoint\n", | |
a068643d | 7296 | target_pid_to_str (ecs->ptid).c_str ()); |
99619bea PA |
7297 | } |
7298 | keep_going (ecs); | |
7299 | return 1; | |
7300 | } | |
7301 | ||
4d9d9d04 PA |
7302 | /* If this thread needs yet another step-over (e.g., stepping |
7303 | through a delay slot), do it first before moving on to | |
7304 | another thread. */ | |
7305 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7306 | { | |
7307 | if (debug_infrun) | |
7308 | { | |
7309 | fprintf_unfiltered (gdb_stdlog, | |
7310 | "infrun: thread [%s] still needs step-over\n", | |
a068643d | 7311 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); |
4d9d9d04 PA |
7312 | } |
7313 | keep_going (ecs); | |
7314 | return 1; | |
7315 | } | |
70509625 | 7316 | |
483805cf PA |
7317 | /* If scheduler locking applies even if not stepping, there's no |
7318 | need to walk over threads. Above we've checked whether the | |
7319 | current thread is stepping. If some other thread not the | |
7320 | event thread is stepping, then it must be that scheduler | |
7321 | locking is not in effect. */ | |
856e7dd6 | 7322 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
7323 | return 0; |
7324 | ||
4d9d9d04 PA |
7325 | /* Otherwise, we no longer expect a trap in the current thread. |
7326 | Clear the trap_expected flag before switching back -- this is | |
7327 | what keep_going does as well, if we call it. */ | |
7328 | ecs->event_thread->control.trap_expected = 0; | |
7329 | ||
7330 | /* Likewise, clear the signal if it should not be passed. */ | |
7331 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7332 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7333 | ||
7334 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 7335 | step/next/etc. */ |
4d9d9d04 PA |
7336 | if (start_step_over ()) |
7337 | { | |
7338 | prepare_to_wait (ecs); | |
7339 | return 1; | |
7340 | } | |
7341 | ||
7342 | /* Look for the stepping/nexting thread. */ | |
483805cf | 7343 | stepping_thread = NULL; |
4d9d9d04 | 7344 | |
08036331 | 7345 | for (thread_info *tp : all_non_exited_threads ()) |
483805cf | 7346 | { |
f3f8ece4 PA |
7347 | switch_to_thread_no_regs (tp); |
7348 | ||
fbea99ea PA |
7349 | /* Ignore threads of processes the caller is not |
7350 | resuming. */ | |
483805cf | 7351 | if (!sched_multi |
5b6d1e4f PA |
7352 | && (tp->inf->process_target () != ecs->target |
7353 | || tp->inf->pid != ecs->ptid.pid ())) | |
483805cf PA |
7354 | continue; |
7355 | ||
7356 | /* When stepping over a breakpoint, we lock all threads | |
7357 | except the one that needs to move past the breakpoint. | |
7358 | If a non-event thread has this set, the "incomplete | |
7359 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
7360 | if (tp->control.trap_expected) |
7361 | { | |
7362 | internal_error (__FILE__, __LINE__, | |
7363 | "[%s] has inconsistent state: " | |
7364 | "trap_expected=%d\n", | |
a068643d | 7365 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
7366 | tp->control.trap_expected); |
7367 | } | |
483805cf PA |
7368 | |
7369 | /* Did we find the stepping thread? */ | |
7370 | if (tp->control.step_range_end) | |
7371 | { | |
7372 | /* Yep. There should only one though. */ | |
7373 | gdb_assert (stepping_thread == NULL); | |
7374 | ||
7375 | /* The event thread is handled at the top, before we | |
7376 | enter this loop. */ | |
7377 | gdb_assert (tp != ecs->event_thread); | |
7378 | ||
7379 | /* If some thread other than the event thread is | |
7380 | stepping, then scheduler locking can't be in effect, | |
7381 | otherwise we wouldn't have resumed the current event | |
7382 | thread in the first place. */ | |
856e7dd6 | 7383 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
7384 | |
7385 | stepping_thread = tp; | |
7386 | } | |
99619bea PA |
7387 | } |
7388 | ||
483805cf | 7389 | if (stepping_thread != NULL) |
99619bea | 7390 | { |
c447ac0b PA |
7391 | if (debug_infrun) |
7392 | fprintf_unfiltered (gdb_stdlog, | |
7393 | "infrun: switching back to stepped thread\n"); | |
7394 | ||
2ac7589c PA |
7395 | if (keep_going_stepped_thread (stepping_thread)) |
7396 | { | |
7397 | prepare_to_wait (ecs); | |
7398 | return 1; | |
7399 | } | |
7400 | } | |
f3f8ece4 PA |
7401 | |
7402 | switch_to_thread (ecs->event_thread); | |
2ac7589c | 7403 | } |
2adfaa28 | 7404 | |
2ac7589c PA |
7405 | return 0; |
7406 | } | |
2adfaa28 | 7407 | |
2ac7589c PA |
7408 | /* Set a previously stepped thread back to stepping. Returns true on |
7409 | success, false if the resume is not possible (e.g., the thread | |
7410 | vanished). */ | |
7411 | ||
7412 | static int | |
7413 | keep_going_stepped_thread (struct thread_info *tp) | |
7414 | { | |
7415 | struct frame_info *frame; | |
2ac7589c PA |
7416 | struct execution_control_state ecss; |
7417 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7418 | |
2ac7589c PA |
7419 | /* If the stepping thread exited, then don't try to switch back and |
7420 | resume it, which could fail in several different ways depending | |
7421 | on the target. Instead, just keep going. | |
2adfaa28 | 7422 | |
2ac7589c PA |
7423 | We can find a stepping dead thread in the thread list in two |
7424 | cases: | |
2adfaa28 | 7425 | |
2ac7589c PA |
7426 | - The target supports thread exit events, and when the target |
7427 | tries to delete the thread from the thread list, inferior_ptid | |
7428 | pointed at the exiting thread. In such case, calling | |
7429 | delete_thread does not really remove the thread from the list; | |
7430 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7431 | |
2ac7589c PA |
7432 | - The target's debug interface does not support thread exit |
7433 | events, and so we have no idea whatsoever if the previously | |
7434 | stepping thread is still alive. For that reason, we need to | |
7435 | synchronously query the target now. */ | |
2adfaa28 | 7436 | |
00431a78 | 7437 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c PA |
7438 | { |
7439 | if (debug_infrun) | |
7440 | fprintf_unfiltered (gdb_stdlog, | |
7441 | "infrun: not resuming previously " | |
7442 | "stepped thread, it has vanished\n"); | |
7443 | ||
00431a78 | 7444 | delete_thread (tp); |
2ac7589c | 7445 | return 0; |
c447ac0b | 7446 | } |
2ac7589c PA |
7447 | |
7448 | if (debug_infrun) | |
7449 | fprintf_unfiltered (gdb_stdlog, | |
7450 | "infrun: resuming previously stepped thread\n"); | |
7451 | ||
7452 | reset_ecs (ecs, tp); | |
00431a78 | 7453 | switch_to_thread (tp); |
2ac7589c | 7454 | |
f2ffa92b | 7455 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 7456 | frame = get_current_frame (); |
2ac7589c PA |
7457 | |
7458 | /* If the PC of the thread we were trying to single-step has | |
7459 | changed, then that thread has trapped or been signaled, but the | |
7460 | event has not been reported to GDB yet. Re-poll the target | |
7461 | looking for this particular thread's event (i.e. temporarily | |
7462 | enable schedlock) by: | |
7463 | ||
7464 | - setting a break at the current PC | |
7465 | - resuming that particular thread, only (by setting trap | |
7466 | expected) | |
7467 | ||
7468 | This prevents us continuously moving the single-step breakpoint | |
7469 | forward, one instruction at a time, overstepping. */ | |
7470 | ||
f2ffa92b | 7471 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
7472 | { |
7473 | ptid_t resume_ptid; | |
7474 | ||
7475 | if (debug_infrun) | |
7476 | fprintf_unfiltered (gdb_stdlog, | |
7477 | "infrun: expected thread advanced also (%s -> %s)\n", | |
7478 | paddress (target_gdbarch (), tp->prev_pc), | |
f2ffa92b | 7479 | paddress (target_gdbarch (), tp->suspend.stop_pc)); |
2ac7589c PA |
7480 | |
7481 | /* Clear the info of the previous step-over, as it's no longer | |
7482 | valid (if the thread was trying to step over a breakpoint, it | |
7483 | has already succeeded). It's what keep_going would do too, | |
7484 | if we called it. Do this before trying to insert the sss | |
7485 | breakpoint, otherwise if we were previously trying to step | |
7486 | over this exact address in another thread, the breakpoint is | |
7487 | skipped. */ | |
7488 | clear_step_over_info (); | |
7489 | tp->control.trap_expected = 0; | |
7490 | ||
7491 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7492 | get_frame_address_space (frame), | |
f2ffa92b | 7493 | tp->suspend.stop_pc); |
2ac7589c | 7494 | |
719546c4 | 7495 | tp->resumed = true; |
fbea99ea | 7496 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7497 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7498 | } | |
7499 | else | |
7500 | { | |
7501 | if (debug_infrun) | |
7502 | fprintf_unfiltered (gdb_stdlog, | |
7503 | "infrun: expected thread still hasn't advanced\n"); | |
7504 | ||
7505 | keep_going_pass_signal (ecs); | |
7506 | } | |
7507 | return 1; | |
c447ac0b PA |
7508 | } |
7509 | ||
8b061563 PA |
7510 | /* Is thread TP in the middle of (software or hardware) |
7511 | single-stepping? (Note the result of this function must never be | |
7512 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7513 | |
a289b8f6 | 7514 | static int |
b3444185 | 7515 | currently_stepping (struct thread_info *tp) |
a7212384 | 7516 | { |
8358c15c JK |
7517 | return ((tp->control.step_range_end |
7518 | && tp->control.step_resume_breakpoint == NULL) | |
7519 | || tp->control.trap_expected | |
af48d08f | 7520 | || tp->stepped_breakpoint |
8358c15c | 7521 | || bpstat_should_step ()); |
a7212384 UW |
7522 | } |
7523 | ||
b2175913 MS |
7524 | /* Inferior has stepped into a subroutine call with source code that |
7525 | we should not step over. Do step to the first line of code in | |
7526 | it. */ | |
c2c6d25f JM |
7527 | |
7528 | static void | |
568d6575 UW |
7529 | handle_step_into_function (struct gdbarch *gdbarch, |
7530 | struct execution_control_state *ecs) | |
c2c6d25f | 7531 | { |
7e324e48 GB |
7532 | fill_in_stop_func (gdbarch, ecs); |
7533 | ||
f2ffa92b PA |
7534 | compunit_symtab *cust |
7535 | = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); | |
43f3e411 | 7536 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7537 | ecs->stop_func_start |
7538 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7539 | |
51abb421 | 7540 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7541 | /* Use the step_resume_break to step until the end of the prologue, |
7542 | even if that involves jumps (as it seems to on the vax under | |
7543 | 4.2). */ | |
7544 | /* If the prologue ends in the middle of a source line, continue to | |
7545 | the end of that source line (if it is still within the function). | |
7546 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7547 | if (stop_func_sal.end |
7548 | && stop_func_sal.pc != ecs->stop_func_start | |
7549 | && stop_func_sal.end < ecs->stop_func_end) | |
7550 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7551 | |
2dbd5e30 KB |
7552 | /* Architectures which require breakpoint adjustment might not be able |
7553 | to place a breakpoint at the computed address. If so, the test | |
7554 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7555 | ecs->stop_func_start to an address at which a breakpoint may be | |
7556 | legitimately placed. | |
8fb3e588 | 7557 | |
2dbd5e30 KB |
7558 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7559 | made, GDB will enter an infinite loop when stepping through | |
7560 | optimized code consisting of VLIW instructions which contain | |
7561 | subinstructions corresponding to different source lines. On | |
7562 | FR-V, it's not permitted to place a breakpoint on any but the | |
7563 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7564 | set, GDB will adjust the breakpoint address to the beginning of | |
7565 | the VLIW instruction. Thus, we need to make the corresponding | |
7566 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7567 | |
568d6575 | 7568 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7569 | { |
7570 | ecs->stop_func_start | |
568d6575 | 7571 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7572 | ecs->stop_func_start); |
2dbd5e30 KB |
7573 | } |
7574 | ||
f2ffa92b | 7575 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7576 | { |
7577 | /* We are already there: stop now. */ | |
bdc36728 | 7578 | end_stepping_range (ecs); |
c2c6d25f JM |
7579 | return; |
7580 | } | |
7581 | else | |
7582 | { | |
7583 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7584 | symtab_and_line sr_sal; |
c2c6d25f JM |
7585 | sr_sal.pc = ecs->stop_func_start; |
7586 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7587 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7588 | |
c2c6d25f | 7589 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7590 | some machines the prologue is where the new fp value is |
7591 | established. */ | |
a6d9a66e | 7592 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7593 | |
7594 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7595 | ecs->event_thread->control.step_range_end |
7596 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7597 | } |
7598 | keep_going (ecs); | |
7599 | } | |
d4f3574e | 7600 | |
b2175913 MS |
7601 | /* Inferior has stepped backward into a subroutine call with source |
7602 | code that we should not step over. Do step to the beginning of the | |
7603 | last line of code in it. */ | |
7604 | ||
7605 | static void | |
568d6575 UW |
7606 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7607 | struct execution_control_state *ecs) | |
b2175913 | 7608 | { |
43f3e411 | 7609 | struct compunit_symtab *cust; |
167e4384 | 7610 | struct symtab_and_line stop_func_sal; |
b2175913 | 7611 | |
7e324e48 GB |
7612 | fill_in_stop_func (gdbarch, ecs); |
7613 | ||
f2ffa92b | 7614 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7615 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7616 | ecs->stop_func_start |
7617 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7618 | |
f2ffa92b | 7619 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7620 | |
7621 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7622 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7623 | { |
7624 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7625 | end_stepping_range (ecs); |
b2175913 MS |
7626 | } |
7627 | else | |
7628 | { | |
7629 | /* Else just reset the step range and keep going. | |
7630 | No step-resume breakpoint, they don't work for | |
7631 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7632 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7633 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7634 | keep_going (ecs); |
7635 | } | |
7636 | return; | |
7637 | } | |
7638 | ||
d3169d93 | 7639 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7640 | This is used to both functions and to skip over code. */ |
7641 | ||
7642 | static void | |
2c03e5be PA |
7643 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7644 | struct symtab_and_line sr_sal, | |
7645 | struct frame_id sr_id, | |
7646 | enum bptype sr_type) | |
44cbf7b5 | 7647 | { |
611c83ae PA |
7648 | /* There should never be more than one step-resume or longjmp-resume |
7649 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7650 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7651 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7652 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
7653 | |
7654 | if (debug_infrun) | |
7655 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7656 | "infrun: inserting step-resume breakpoint at %s\n", |
7657 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7658 | |
8358c15c | 7659 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7660 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7661 | } |
7662 | ||
9da8c2a0 | 7663 | void |
2c03e5be PA |
7664 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7665 | struct symtab_and_line sr_sal, | |
7666 | struct frame_id sr_id) | |
7667 | { | |
7668 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7669 | sr_sal, sr_id, | |
7670 | bp_step_resume); | |
44cbf7b5 | 7671 | } |
7ce450bd | 7672 | |
2c03e5be PA |
7673 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7674 | This is used to skip a potential signal handler. | |
7ce450bd | 7675 | |
14e60db5 DJ |
7676 | This is called with the interrupted function's frame. The signal |
7677 | handler, when it returns, will resume the interrupted function at | |
7678 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7679 | |
7680 | static void | |
2c03e5be | 7681 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7682 | { |
f4c1edd8 | 7683 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7684 | |
51abb421 PA |
7685 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7686 | ||
7687 | symtab_and_line sr_sal; | |
568d6575 | 7688 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7689 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7690 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7691 | |
2c03e5be PA |
7692 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7693 | get_stack_frame_id (return_frame), | |
7694 | bp_hp_step_resume); | |
d303a6c7 AC |
7695 | } |
7696 | ||
2c03e5be PA |
7697 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7698 | is used to skip a function after stepping into it (for "next" or if | |
7699 | the called function has no debugging information). | |
14e60db5 DJ |
7700 | |
7701 | The current function has almost always been reached by single | |
7702 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7703 | current function, and the breakpoint will be set at the caller's | |
7704 | resume address. | |
7705 | ||
7706 | This is a separate function rather than reusing | |
2c03e5be | 7707 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7708 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7709 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7710 | |
7711 | static void | |
7712 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7713 | { | |
14e60db5 DJ |
7714 | /* We shouldn't have gotten here if we don't know where the call site |
7715 | is. */ | |
c7ce8faa | 7716 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7717 | |
51abb421 | 7718 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7719 | |
51abb421 | 7720 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7721 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7722 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7723 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7724 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7725 | |
a6d9a66e | 7726 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7727 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7728 | } |
7729 | ||
611c83ae PA |
7730 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7731 | new breakpoint at the target of a jmp_buf. The handling of | |
7732 | longjmp-resume uses the same mechanisms used for handling | |
7733 | "step-resume" breakpoints. */ | |
7734 | ||
7735 | static void | |
a6d9a66e | 7736 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7737 | { |
e81a37f7 TT |
7738 | /* There should never be more than one longjmp-resume breakpoint per |
7739 | thread, so we should never be setting a new | |
611c83ae | 7740 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7741 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
7742 | |
7743 | if (debug_infrun) | |
7744 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7745 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
7746 | paddress (gdbarch, pc)); | |
611c83ae | 7747 | |
e81a37f7 | 7748 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7749 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7750 | } |
7751 | ||
186c406b TT |
7752 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7753 | the exception. The block B is the block of the unwinder debug hook | |
7754 | function. FRAME is the frame corresponding to the call to this | |
7755 | function. SYM is the symbol of the function argument holding the | |
7756 | target PC of the exception. */ | |
7757 | ||
7758 | static void | |
7759 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7760 | const struct block *b, |
186c406b TT |
7761 | struct frame_info *frame, |
7762 | struct symbol *sym) | |
7763 | { | |
a70b8144 | 7764 | try |
186c406b | 7765 | { |
63e43d3a | 7766 | struct block_symbol vsym; |
186c406b TT |
7767 | struct value *value; |
7768 | CORE_ADDR handler; | |
7769 | struct breakpoint *bp; | |
7770 | ||
987012b8 | 7771 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 7772 | b, VAR_DOMAIN); |
63e43d3a | 7773 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7774 | /* If the value was optimized out, revert to the old behavior. */ |
7775 | if (! value_optimized_out (value)) | |
7776 | { | |
7777 | handler = value_as_address (value); | |
7778 | ||
7779 | if (debug_infrun) | |
7780 | fprintf_unfiltered (gdb_stdlog, | |
7781 | "infrun: exception resume at %lx\n", | |
7782 | (unsigned long) handler); | |
7783 | ||
7784 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7785 | handler, |
7786 | bp_exception_resume).release (); | |
c70a6932 JK |
7787 | |
7788 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7789 | frame = NULL; | |
7790 | ||
5d5658a1 | 7791 | bp->thread = tp->global_num; |
186c406b TT |
7792 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7793 | } | |
7794 | } | |
230d2906 | 7795 | catch (const gdb_exception_error &e) |
492d29ea PA |
7796 | { |
7797 | /* We want to ignore errors here. */ | |
7798 | } | |
186c406b TT |
7799 | } |
7800 | ||
28106bc2 SDJ |
7801 | /* A helper for check_exception_resume that sets an |
7802 | exception-breakpoint based on a SystemTap probe. */ | |
7803 | ||
7804 | static void | |
7805 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7806 | const struct bound_probe *probe, |
28106bc2 SDJ |
7807 | struct frame_info *frame) |
7808 | { | |
7809 | struct value *arg_value; | |
7810 | CORE_ADDR handler; | |
7811 | struct breakpoint *bp; | |
7812 | ||
7813 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7814 | if (!arg_value) | |
7815 | return; | |
7816 | ||
7817 | handler = value_as_address (arg_value); | |
7818 | ||
7819 | if (debug_infrun) | |
7820 | fprintf_unfiltered (gdb_stdlog, | |
7821 | "infrun: exception resume at %s\n", | |
08feed99 | 7822 | paddress (probe->objfile->arch (), |
28106bc2 SDJ |
7823 | handler)); |
7824 | ||
7825 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7826 | handler, bp_exception_resume).release (); |
5d5658a1 | 7827 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7828 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7829 | } | |
7830 | ||
186c406b TT |
7831 | /* This is called when an exception has been intercepted. Check to |
7832 | see whether the exception's destination is of interest, and if so, | |
7833 | set an exception resume breakpoint there. */ | |
7834 | ||
7835 | static void | |
7836 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7837 | struct frame_info *frame) |
186c406b | 7838 | { |
729662a5 | 7839 | struct bound_probe probe; |
28106bc2 SDJ |
7840 | struct symbol *func; |
7841 | ||
7842 | /* First see if this exception unwinding breakpoint was set via a | |
7843 | SystemTap probe point. If so, the probe has two arguments: the | |
7844 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7845 | set a breakpoint there. */ | |
6bac7473 | 7846 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7847 | if (probe.prob) |
28106bc2 | 7848 | { |
729662a5 | 7849 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7850 | return; |
7851 | } | |
7852 | ||
7853 | func = get_frame_function (frame); | |
7854 | if (!func) | |
7855 | return; | |
186c406b | 7856 | |
a70b8144 | 7857 | try |
186c406b | 7858 | { |
3977b71f | 7859 | const struct block *b; |
8157b174 | 7860 | struct block_iterator iter; |
186c406b TT |
7861 | struct symbol *sym; |
7862 | int argno = 0; | |
7863 | ||
7864 | /* The exception breakpoint is a thread-specific breakpoint on | |
7865 | the unwinder's debug hook, declared as: | |
7866 | ||
7867 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7868 | ||
7869 | The CFA argument indicates the frame to which control is | |
7870 | about to be transferred. HANDLER is the destination PC. | |
7871 | ||
7872 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7873 | This is not extremely efficient but it avoids issues in gdb | |
7874 | with computing the DWARF CFA, and it also works even in weird | |
7875 | cases such as throwing an exception from inside a signal | |
7876 | handler. */ | |
7877 | ||
7878 | b = SYMBOL_BLOCK_VALUE (func); | |
7879 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7880 | { | |
7881 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7882 | continue; | |
7883 | ||
7884 | if (argno == 0) | |
7885 | ++argno; | |
7886 | else | |
7887 | { | |
7888 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7889 | b, frame, sym); | |
7890 | break; | |
7891 | } | |
7892 | } | |
7893 | } | |
230d2906 | 7894 | catch (const gdb_exception_error &e) |
492d29ea PA |
7895 | { |
7896 | } | |
186c406b TT |
7897 | } |
7898 | ||
104c1213 | 7899 | static void |
22bcd14b | 7900 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7901 | { |
527159b7 | 7902 | if (debug_infrun) |
22bcd14b | 7903 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 7904 | |
cd0fc7c3 SS |
7905 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7906 | ecs->wait_some_more = 0; | |
fbea99ea | 7907 | |
53cccef1 | 7908 | /* If all-stop, but there exists a non-stop target, stop all |
fbea99ea | 7909 | threads now that we're presenting the stop to the user. */ |
53cccef1 | 7910 | if (!non_stop && exists_non_stop_target ()) |
fbea99ea | 7911 | stop_all_threads (); |
cd0fc7c3 SS |
7912 | } |
7913 | ||
4d9d9d04 PA |
7914 | /* Like keep_going, but passes the signal to the inferior, even if the |
7915 | signal is set to nopass. */ | |
d4f3574e SS |
7916 | |
7917 | static void | |
4d9d9d04 | 7918 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7919 | { |
d7e15655 | 7920 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 7921 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7922 | |
d4f3574e | 7923 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 7924 | ecs->event_thread->prev_pc |
00431a78 | 7925 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 7926 | |
4d9d9d04 | 7927 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7928 | { |
4d9d9d04 PA |
7929 | struct thread_info *tp = ecs->event_thread; |
7930 | ||
7931 | if (debug_infrun) | |
7932 | fprintf_unfiltered (gdb_stdlog, | |
7933 | "infrun: %s has trap_expected set, " | |
7934 | "resuming to collect trap\n", | |
a068643d | 7935 | target_pid_to_str (tp->ptid).c_str ()); |
4d9d9d04 | 7936 | |
a9ba6bae PA |
7937 | /* We haven't yet gotten our trap, and either: intercepted a |
7938 | non-signal event (e.g., a fork); or took a signal which we | |
7939 | are supposed to pass through to the inferior. Simply | |
7940 | continue. */ | |
64ce06e4 | 7941 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7942 | } |
372316f1 PA |
7943 | else if (step_over_info_valid_p ()) |
7944 | { | |
7945 | /* Another thread is stepping over a breakpoint in-line. If | |
7946 | this thread needs a step-over too, queue the request. In | |
7947 | either case, this resume must be deferred for later. */ | |
7948 | struct thread_info *tp = ecs->event_thread; | |
7949 | ||
7950 | if (ecs->hit_singlestep_breakpoint | |
7951 | || thread_still_needs_step_over (tp)) | |
7952 | { | |
7953 | if (debug_infrun) | |
7954 | fprintf_unfiltered (gdb_stdlog, | |
7955 | "infrun: step-over already in progress: " | |
7956 | "step-over for %s deferred\n", | |
a068643d | 7957 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
7958 | thread_step_over_chain_enqueue (tp); |
7959 | } | |
7960 | else | |
7961 | { | |
7962 | if (debug_infrun) | |
7963 | fprintf_unfiltered (gdb_stdlog, | |
7964 | "infrun: step-over in progress: " | |
7965 | "resume of %s deferred\n", | |
a068643d | 7966 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 | 7967 | } |
372316f1 | 7968 | } |
d4f3574e SS |
7969 | else |
7970 | { | |
31e77af2 | 7971 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7972 | int remove_bp; |
7973 | int remove_wps; | |
8d297bbf | 7974 | step_over_what step_what; |
31e77af2 | 7975 | |
d4f3574e | 7976 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7977 | anyway (if we got a signal, the user asked it be passed to |
7978 | the child) | |
7979 | -- or -- | |
7980 | We got our expected trap, but decided we should resume from | |
7981 | it. | |
d4f3574e | 7982 | |
a9ba6bae | 7983 | We're going to run this baby now! |
d4f3574e | 7984 | |
c36b740a VP |
7985 | Note that insert_breakpoints won't try to re-insert |
7986 | already inserted breakpoints. Therefore, we don't | |
7987 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7988 | |
31e77af2 PA |
7989 | /* If we need to step over a breakpoint, and we're not using |
7990 | displaced stepping to do so, insert all breakpoints | |
7991 | (watchpoints, etc.) but the one we're stepping over, step one | |
7992 | instruction, and then re-insert the breakpoint when that step | |
7993 | is finished. */ | |
963f9c80 | 7994 | |
6c4cfb24 PA |
7995 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7996 | ||
963f9c80 | 7997 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7998 | || (step_what & STEP_OVER_BREAKPOINT)); |
7999 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 8000 | |
cb71640d PA |
8001 | /* We can't use displaced stepping if we need to step past a |
8002 | watchpoint. The instruction copied to the scratch pad would | |
8003 | still trigger the watchpoint. */ | |
8004 | if (remove_bp | |
3fc8eb30 | 8005 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 8006 | { |
a01bda52 | 8007 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
8008 | regcache_read_pc (regcache), remove_wps, |
8009 | ecs->event_thread->global_num); | |
45e8c884 | 8010 | } |
963f9c80 | 8011 | else if (remove_wps) |
21edc42f | 8012 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
8013 | |
8014 | /* If we now need to do an in-line step-over, we need to stop | |
8015 | all other threads. Note this must be done before | |
8016 | insert_breakpoints below, because that removes the breakpoint | |
8017 | we're about to step over, otherwise other threads could miss | |
8018 | it. */ | |
fbea99ea | 8019 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 8020 | stop_all_threads (); |
abbb1732 | 8021 | |
31e77af2 | 8022 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 8023 | try |
31e77af2 PA |
8024 | { |
8025 | insert_breakpoints (); | |
8026 | } | |
230d2906 | 8027 | catch (const gdb_exception_error &e) |
31e77af2 PA |
8028 | { |
8029 | exception_print (gdb_stderr, e); | |
22bcd14b | 8030 | stop_waiting (ecs); |
bdf2a94a | 8031 | clear_step_over_info (); |
31e77af2 | 8032 | return; |
d4f3574e SS |
8033 | } |
8034 | ||
963f9c80 | 8035 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 8036 | |
64ce06e4 | 8037 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
8038 | } |
8039 | ||
488f131b | 8040 | prepare_to_wait (ecs); |
d4f3574e SS |
8041 | } |
8042 | ||
4d9d9d04 PA |
8043 | /* Called when we should continue running the inferior, because the |
8044 | current event doesn't cause a user visible stop. This does the | |
8045 | resuming part; waiting for the next event is done elsewhere. */ | |
8046 | ||
8047 | static void | |
8048 | keep_going (struct execution_control_state *ecs) | |
8049 | { | |
8050 | if (ecs->event_thread->control.trap_expected | |
8051 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
8052 | ecs->event_thread->control.trap_expected = 0; | |
8053 | ||
8054 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
8055 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
8056 | keep_going_pass_signal (ecs); | |
8057 | } | |
8058 | ||
104c1213 JM |
8059 | /* This function normally comes after a resume, before |
8060 | handle_inferior_event exits. It takes care of any last bits of | |
8061 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 8062 | |
104c1213 JM |
8063 | static void |
8064 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 8065 | { |
527159b7 | 8066 | if (debug_infrun) |
8a9de0e4 | 8067 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 8068 | |
104c1213 | 8069 | ecs->wait_some_more = 1; |
0b333c5e PA |
8070 | |
8071 | if (!target_is_async_p ()) | |
8072 | mark_infrun_async_event_handler (); | |
c906108c | 8073 | } |
11cf8741 | 8074 | |
fd664c91 | 8075 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 8076 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
8077 | |
8078 | static void | |
bdc36728 | 8079 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 8080 | { |
bdc36728 | 8081 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 8082 | stop_waiting (ecs); |
fd664c91 PA |
8083 | } |
8084 | ||
33d62d64 JK |
8085 | /* Several print_*_reason functions to print why the inferior has stopped. |
8086 | We always print something when the inferior exits, or receives a signal. | |
8087 | The rest of the cases are dealt with later on in normal_stop and | |
8088 | print_it_typical. Ideally there should be a call to one of these | |
8089 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 8090 | stop_waiting is called. |
33d62d64 | 8091 | |
fd664c91 PA |
8092 | Note that we don't call these directly, instead we delegate that to |
8093 | the interpreters, through observers. Interpreters then call these | |
8094 | with whatever uiout is right. */ | |
33d62d64 | 8095 | |
fd664c91 PA |
8096 | void |
8097 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 8098 | { |
fd664c91 | 8099 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 8100 | |
112e8700 | 8101 | if (uiout->is_mi_like_p ()) |
fd664c91 | 8102 | { |
112e8700 | 8103 | uiout->field_string ("reason", |
fd664c91 PA |
8104 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
8105 | } | |
8106 | } | |
33d62d64 | 8107 | |
fd664c91 PA |
8108 | void |
8109 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 8110 | { |
33d62d64 | 8111 | annotate_signalled (); |
112e8700 SM |
8112 | if (uiout->is_mi_like_p ()) |
8113 | uiout->field_string | |
8114 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8115 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 8116 | annotate_signal_name (); |
112e8700 | 8117 | uiout->field_string ("signal-name", |
2ea28649 | 8118 | gdb_signal_to_name (siggnal)); |
33d62d64 | 8119 | annotate_signal_name_end (); |
112e8700 | 8120 | uiout->text (", "); |
33d62d64 | 8121 | annotate_signal_string (); |
112e8700 | 8122 | uiout->field_string ("signal-meaning", |
2ea28649 | 8123 | gdb_signal_to_string (siggnal)); |
33d62d64 | 8124 | annotate_signal_string_end (); |
112e8700 SM |
8125 | uiout->text (".\n"); |
8126 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
8127 | } |
8128 | ||
fd664c91 PA |
8129 | void |
8130 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 8131 | { |
fda326dd | 8132 | struct inferior *inf = current_inferior (); |
a068643d | 8133 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 8134 | |
33d62d64 JK |
8135 | annotate_exited (exitstatus); |
8136 | if (exitstatus) | |
8137 | { | |
112e8700 SM |
8138 | if (uiout->is_mi_like_p ()) |
8139 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
8140 | std::string exit_code_str |
8141 | = string_printf ("0%o", (unsigned int) exitstatus); | |
8142 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
8143 | plongest (inf->num), pidstr.c_str (), | |
8144 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
8145 | } |
8146 | else | |
11cf8741 | 8147 | { |
112e8700 SM |
8148 | if (uiout->is_mi_like_p ()) |
8149 | uiout->field_string | |
8150 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
8151 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
8152 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 8153 | } |
33d62d64 JK |
8154 | } |
8155 | ||
012b3a21 WT |
8156 | /* Some targets/architectures can do extra processing/display of |
8157 | segmentation faults. E.g., Intel MPX boundary faults. | |
8158 | Call the architecture dependent function to handle the fault. */ | |
8159 | ||
8160 | static void | |
8161 | handle_segmentation_fault (struct ui_out *uiout) | |
8162 | { | |
8163 | struct regcache *regcache = get_current_regcache (); | |
ac7936df | 8164 | struct gdbarch *gdbarch = regcache->arch (); |
012b3a21 WT |
8165 | |
8166 | if (gdbarch_handle_segmentation_fault_p (gdbarch)) | |
8167 | gdbarch_handle_segmentation_fault (gdbarch, uiout); | |
8168 | } | |
8169 | ||
fd664c91 PA |
8170 | void |
8171 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 8172 | { |
f303dbd6 PA |
8173 | struct thread_info *thr = inferior_thread (); |
8174 | ||
33d62d64 JK |
8175 | annotate_signal (); |
8176 | ||
112e8700 | 8177 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
8178 | ; |
8179 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 8180 | { |
f303dbd6 | 8181 | const char *name; |
33d62d64 | 8182 | |
112e8700 | 8183 | uiout->text ("\nThread "); |
33eca680 | 8184 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 PA |
8185 | |
8186 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
8187 | if (name != NULL) | |
8188 | { | |
112e8700 | 8189 | uiout->text (" \""); |
33eca680 | 8190 | uiout->field_string ("name", name); |
112e8700 | 8191 | uiout->text ("\""); |
f303dbd6 | 8192 | } |
33d62d64 | 8193 | } |
f303dbd6 | 8194 | else |
112e8700 | 8195 | uiout->text ("\nProgram"); |
f303dbd6 | 8196 | |
112e8700 SM |
8197 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8198 | uiout->text (" stopped"); | |
33d62d64 JK |
8199 | else |
8200 | { | |
112e8700 | 8201 | uiout->text (" received signal "); |
8b93c638 | 8202 | annotate_signal_name (); |
112e8700 SM |
8203 | if (uiout->is_mi_like_p ()) |
8204 | uiout->field_string | |
8205 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8206 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8207 | annotate_signal_name_end (); |
112e8700 | 8208 | uiout->text (", "); |
8b93c638 | 8209 | annotate_signal_string (); |
112e8700 | 8210 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 WT |
8211 | |
8212 | if (siggnal == GDB_SIGNAL_SEGV) | |
8213 | handle_segmentation_fault (uiout); | |
8214 | ||
8b93c638 | 8215 | annotate_signal_string_end (); |
33d62d64 | 8216 | } |
112e8700 | 8217 | uiout->text (".\n"); |
33d62d64 | 8218 | } |
252fbfc8 | 8219 | |
fd664c91 PA |
8220 | void |
8221 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8222 | { |
112e8700 | 8223 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8224 | } |
43ff13b4 | 8225 | |
0c7e1a46 PA |
8226 | /* Print current location without a level number, if we have changed |
8227 | functions or hit a breakpoint. Print source line if we have one. | |
8228 | bpstat_print contains the logic deciding in detail what to print, | |
8229 | based on the event(s) that just occurred. */ | |
8230 | ||
243a9253 PA |
8231 | static void |
8232 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8233 | { |
8234 | int bpstat_ret; | |
f486487f | 8235 | enum print_what source_flag; |
0c7e1a46 PA |
8236 | int do_frame_printing = 1; |
8237 | struct thread_info *tp = inferior_thread (); | |
8238 | ||
8239 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8240 | switch (bpstat_ret) | |
8241 | { | |
8242 | case PRINT_UNKNOWN: | |
8243 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8244 | should) carry around the function and does (or should) use | |
8245 | that when doing a frame comparison. */ | |
8246 | if (tp->control.stop_step | |
8247 | && frame_id_eq (tp->control.step_frame_id, | |
8248 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
8249 | && (tp->control.step_start_function |
8250 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
8251 | { |
8252 | /* Finished step, just print source line. */ | |
8253 | source_flag = SRC_LINE; | |
8254 | } | |
8255 | else | |
8256 | { | |
8257 | /* Print location and source line. */ | |
8258 | source_flag = SRC_AND_LOC; | |
8259 | } | |
8260 | break; | |
8261 | case PRINT_SRC_AND_LOC: | |
8262 | /* Print location and source line. */ | |
8263 | source_flag = SRC_AND_LOC; | |
8264 | break; | |
8265 | case PRINT_SRC_ONLY: | |
8266 | source_flag = SRC_LINE; | |
8267 | break; | |
8268 | case PRINT_NOTHING: | |
8269 | /* Something bogus. */ | |
8270 | source_flag = SRC_LINE; | |
8271 | do_frame_printing = 0; | |
8272 | break; | |
8273 | default: | |
8274 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8275 | } | |
8276 | ||
8277 | /* The behavior of this routine with respect to the source | |
8278 | flag is: | |
8279 | SRC_LINE: Print only source line | |
8280 | LOCATION: Print only location | |
8281 | SRC_AND_LOC: Print location and source line. */ | |
8282 | if (do_frame_printing) | |
8283 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8284 | } |
8285 | ||
243a9253 PA |
8286 | /* See infrun.h. */ |
8287 | ||
8288 | void | |
4c7d57e7 | 8289 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8290 | { |
243a9253 | 8291 | struct target_waitstatus last; |
243a9253 PA |
8292 | struct thread_info *tp; |
8293 | ||
5b6d1e4f | 8294 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8295 | |
67ad9399 TT |
8296 | { |
8297 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8298 | |
67ad9399 | 8299 | print_stop_location (&last); |
243a9253 | 8300 | |
67ad9399 | 8301 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8302 | if (displays) |
8303 | do_displays (); | |
67ad9399 | 8304 | } |
243a9253 PA |
8305 | |
8306 | tp = inferior_thread (); | |
8307 | if (tp->thread_fsm != NULL | |
46e3ed7f | 8308 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
8309 | { |
8310 | struct return_value_info *rv; | |
8311 | ||
46e3ed7f | 8312 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
8313 | if (rv != NULL) |
8314 | print_return_value (uiout, rv); | |
8315 | } | |
0c7e1a46 PA |
8316 | } |
8317 | ||
388a7084 PA |
8318 | /* See infrun.h. */ |
8319 | ||
8320 | void | |
8321 | maybe_remove_breakpoints (void) | |
8322 | { | |
8323 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
8324 | { | |
8325 | if (remove_breakpoints ()) | |
8326 | { | |
223ffa71 | 8327 | target_terminal::ours_for_output (); |
388a7084 PA |
8328 | printf_filtered (_("Cannot remove breakpoints because " |
8329 | "program is no longer writable.\nFurther " | |
8330 | "execution is probably impossible.\n")); | |
8331 | } | |
8332 | } | |
8333 | } | |
8334 | ||
4c2f2a79 PA |
8335 | /* The execution context that just caused a normal stop. */ |
8336 | ||
8337 | struct stop_context | |
8338 | { | |
2d844eaf TT |
8339 | stop_context (); |
8340 | ~stop_context (); | |
8341 | ||
8342 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8343 | ||
8344 | bool changed () const; | |
8345 | ||
4c2f2a79 PA |
8346 | /* The stop ID. */ |
8347 | ULONGEST stop_id; | |
c906108c | 8348 | |
4c2f2a79 | 8349 | /* The event PTID. */ |
c906108c | 8350 | |
4c2f2a79 PA |
8351 | ptid_t ptid; |
8352 | ||
8353 | /* If stopp for a thread event, this is the thread that caused the | |
8354 | stop. */ | |
8355 | struct thread_info *thread; | |
8356 | ||
8357 | /* The inferior that caused the stop. */ | |
8358 | int inf_num; | |
8359 | }; | |
8360 | ||
2d844eaf | 8361 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8362 | takes a strong reference to the thread. */ |
8363 | ||
2d844eaf | 8364 | stop_context::stop_context () |
4c2f2a79 | 8365 | { |
2d844eaf TT |
8366 | stop_id = get_stop_id (); |
8367 | ptid = inferior_ptid; | |
8368 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8369 | |
d7e15655 | 8370 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8371 | { |
8372 | /* Take a strong reference so that the thread can't be deleted | |
8373 | yet. */ | |
2d844eaf TT |
8374 | thread = inferior_thread (); |
8375 | thread->incref (); | |
4c2f2a79 PA |
8376 | } |
8377 | else | |
2d844eaf | 8378 | thread = NULL; |
4c2f2a79 PA |
8379 | } |
8380 | ||
8381 | /* Release a stop context previously created with save_stop_context. | |
8382 | Releases the strong reference to the thread as well. */ | |
8383 | ||
2d844eaf | 8384 | stop_context::~stop_context () |
4c2f2a79 | 8385 | { |
2d844eaf TT |
8386 | if (thread != NULL) |
8387 | thread->decref (); | |
4c2f2a79 PA |
8388 | } |
8389 | ||
8390 | /* Return true if the current context no longer matches the saved stop | |
8391 | context. */ | |
8392 | ||
2d844eaf TT |
8393 | bool |
8394 | stop_context::changed () const | |
8395 | { | |
8396 | if (ptid != inferior_ptid) | |
8397 | return true; | |
8398 | if (inf_num != current_inferior ()->num) | |
8399 | return true; | |
8400 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8401 | return true; | |
8402 | if (get_stop_id () != stop_id) | |
8403 | return true; | |
8404 | return false; | |
4c2f2a79 PA |
8405 | } |
8406 | ||
8407 | /* See infrun.h. */ | |
8408 | ||
8409 | int | |
96baa820 | 8410 | normal_stop (void) |
c906108c | 8411 | { |
73b65bb0 | 8412 | struct target_waitstatus last; |
73b65bb0 | 8413 | |
5b6d1e4f | 8414 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8415 | |
4c2f2a79 PA |
8416 | new_stop_id (); |
8417 | ||
29f49a6a PA |
8418 | /* If an exception is thrown from this point on, make sure to |
8419 | propagate GDB's knowledge of the executing state to the | |
8420 | frontend/user running state. A QUIT is an easy exception to see | |
8421 | here, so do this before any filtered output. */ | |
731f534f | 8422 | |
5b6d1e4f | 8423 | ptid_t finish_ptid = null_ptid; |
731f534f | 8424 | |
c35b1492 | 8425 | if (!non_stop) |
5b6d1e4f | 8426 | finish_ptid = minus_one_ptid; |
e1316e60 PA |
8427 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8428 | || last.kind == TARGET_WAITKIND_EXITED) | |
8429 | { | |
8430 | /* On some targets, we may still have live threads in the | |
8431 | inferior when we get a process exit event. E.g., for | |
8432 | "checkpoint", when the current checkpoint/fork exits, | |
8433 | linux-fork.c automatically switches to another fork from | |
8434 | within target_mourn_inferior. */ | |
731f534f | 8435 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8436 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 PA |
8437 | } |
8438 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5b6d1e4f PA |
8439 | finish_ptid = inferior_ptid; |
8440 | ||
8441 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8442 | if (finish_ptid != null_ptid) | |
8443 | { | |
8444 | maybe_finish_thread_state.emplace | |
8445 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8446 | } | |
29f49a6a | 8447 | |
b57bacec PA |
8448 | /* As we're presenting a stop, and potentially removing breakpoints, |
8449 | update the thread list so we can tell whether there are threads | |
8450 | running on the target. With target remote, for example, we can | |
8451 | only learn about new threads when we explicitly update the thread | |
8452 | list. Do this before notifying the interpreters about signal | |
8453 | stops, end of stepping ranges, etc., so that the "new thread" | |
8454 | output is emitted before e.g., "Program received signal FOO", | |
8455 | instead of after. */ | |
8456 | update_thread_list (); | |
8457 | ||
8458 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 8459 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 8460 | |
c906108c SS |
8461 | /* As with the notification of thread events, we want to delay |
8462 | notifying the user that we've switched thread context until | |
8463 | the inferior actually stops. | |
8464 | ||
73b65bb0 DJ |
8465 | There's no point in saying anything if the inferior has exited. |
8466 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8467 | "received a signal". |
8468 | ||
8469 | Also skip saying anything in non-stop mode. In that mode, as we | |
8470 | don't want GDB to switch threads behind the user's back, to avoid | |
8471 | races where the user is typing a command to apply to thread x, | |
8472 | but GDB switches to thread y before the user finishes entering | |
8473 | the command, fetch_inferior_event installs a cleanup to restore | |
8474 | the current thread back to the thread the user had selected right | |
8475 | after this event is handled, so we're not really switching, only | |
8476 | informing of a stop. */ | |
4f8d22e3 | 8477 | if (!non_stop |
731f534f | 8478 | && previous_inferior_ptid != inferior_ptid |
73b65bb0 DJ |
8479 | && target_has_execution |
8480 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8481 | && last.kind != TARGET_WAITKIND_EXITED |
8482 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8483 | { |
0e454242 | 8484 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8485 | { |
223ffa71 | 8486 | target_terminal::ours_for_output (); |
3b12939d | 8487 | printf_filtered (_("[Switching to %s]\n"), |
a068643d | 8488 | target_pid_to_str (inferior_ptid).c_str ()); |
3b12939d PA |
8489 | annotate_thread_changed (); |
8490 | } | |
39f77062 | 8491 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8492 | } |
c906108c | 8493 | |
0e5bf2a8 PA |
8494 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8495 | { | |
0e454242 | 8496 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8497 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8498 | { | |
223ffa71 | 8499 | target_terminal::ours_for_output (); |
3b12939d PA |
8500 | printf_filtered (_("No unwaited-for children left.\n")); |
8501 | } | |
0e5bf2a8 PA |
8502 | } |
8503 | ||
b57bacec | 8504 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8505 | maybe_remove_breakpoints (); |
c906108c | 8506 | |
c906108c SS |
8507 | /* If an auto-display called a function and that got a signal, |
8508 | delete that auto-display to avoid an infinite recursion. */ | |
8509 | ||
8510 | if (stopped_by_random_signal) | |
8511 | disable_current_display (); | |
8512 | ||
0e454242 | 8513 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8514 | { |
8515 | async_enable_stdin (); | |
8516 | } | |
c906108c | 8517 | |
388a7084 | 8518 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8519 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8520 | |
8521 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8522 | and current location is based on that. Handle the case where the | |
8523 | dummy call is returning after being stopped. E.g. the dummy call | |
8524 | previously hit a breakpoint. (If the dummy call returns | |
8525 | normally, we won't reach here.) Do this before the stop hook is | |
8526 | run, so that it doesn't get to see the temporary dummy frame, | |
8527 | which is not where we'll present the stop. */ | |
8528 | if (has_stack_frames ()) | |
8529 | { | |
8530 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8531 | { | |
8532 | /* Pop the empty frame that contains the stack dummy. This | |
8533 | also restores inferior state prior to the call (struct | |
8534 | infcall_suspend_state). */ | |
8535 | struct frame_info *frame = get_current_frame (); | |
8536 | ||
8537 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8538 | frame_pop (frame); | |
8539 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8540 | does which means there's now no selected frame. */ | |
8541 | } | |
8542 | ||
8543 | select_frame (get_current_frame ()); | |
8544 | ||
8545 | /* Set the current source location. */ | |
8546 | set_current_sal_from_frame (get_current_frame ()); | |
8547 | } | |
dd7e2d2b PA |
8548 | |
8549 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8550 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8551 | if (stop_command != NULL) |
8552 | { | |
2d844eaf | 8553 | stop_context saved_context; |
4c2f2a79 | 8554 | |
a70b8144 | 8555 | try |
bf469271 PA |
8556 | { |
8557 | execute_cmd_pre_hook (stop_command); | |
8558 | } | |
230d2906 | 8559 | catch (const gdb_exception &ex) |
bf469271 PA |
8560 | { |
8561 | exception_fprintf (gdb_stderr, ex, | |
8562 | "Error while running hook_stop:\n"); | |
8563 | } | |
4c2f2a79 PA |
8564 | |
8565 | /* If the stop hook resumes the target, then there's no point in | |
8566 | trying to notify about the previous stop; its context is | |
8567 | gone. Likewise if the command switches thread or inferior -- | |
8568 | the observers would print a stop for the wrong | |
8569 | thread/inferior. */ | |
2d844eaf TT |
8570 | if (saved_context.changed ()) |
8571 | return 1; | |
4c2f2a79 | 8572 | } |
dd7e2d2b | 8573 | |
388a7084 PA |
8574 | /* Notify observers about the stop. This is where the interpreters |
8575 | print the stop event. */ | |
d7e15655 | 8576 | if (inferior_ptid != null_ptid) |
76727919 | 8577 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
388a7084 PA |
8578 | stop_print_frame); |
8579 | else | |
76727919 | 8580 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8581 | |
243a9253 PA |
8582 | annotate_stopped (); |
8583 | ||
48844aa6 PA |
8584 | if (target_has_execution) |
8585 | { | |
8586 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
fe726667 PA |
8587 | && last.kind != TARGET_WAITKIND_EXITED |
8588 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8589 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8590 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8591 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8592 | } |
6c95b8df PA |
8593 | |
8594 | /* Try to get rid of automatically added inferiors that are no | |
8595 | longer needed. Keeping those around slows down things linearly. | |
8596 | Note that this never removes the current inferior. */ | |
8597 | prune_inferiors (); | |
4c2f2a79 PA |
8598 | |
8599 | return 0; | |
c906108c | 8600 | } |
c906108c | 8601 | \f |
c5aa993b | 8602 | int |
96baa820 | 8603 | signal_stop_state (int signo) |
c906108c | 8604 | { |
d6b48e9c | 8605 | return signal_stop[signo]; |
c906108c SS |
8606 | } |
8607 | ||
c5aa993b | 8608 | int |
96baa820 | 8609 | signal_print_state (int signo) |
c906108c SS |
8610 | { |
8611 | return signal_print[signo]; | |
8612 | } | |
8613 | ||
c5aa993b | 8614 | int |
96baa820 | 8615 | signal_pass_state (int signo) |
c906108c SS |
8616 | { |
8617 | return signal_program[signo]; | |
8618 | } | |
8619 | ||
2455069d UW |
8620 | static void |
8621 | signal_cache_update (int signo) | |
8622 | { | |
8623 | if (signo == -1) | |
8624 | { | |
a493e3e2 | 8625 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8626 | signal_cache_update (signo); |
8627 | ||
8628 | return; | |
8629 | } | |
8630 | ||
8631 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8632 | && signal_print[signo] == 0 | |
ab04a2af TT |
8633 | && signal_program[signo] == 1 |
8634 | && signal_catch[signo] == 0); | |
2455069d UW |
8635 | } |
8636 | ||
488f131b | 8637 | int |
7bda5e4a | 8638 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8639 | { |
8640 | int ret = signal_stop[signo]; | |
abbb1732 | 8641 | |
d4f3574e | 8642 | signal_stop[signo] = state; |
2455069d | 8643 | signal_cache_update (signo); |
d4f3574e SS |
8644 | return ret; |
8645 | } | |
8646 | ||
488f131b | 8647 | int |
7bda5e4a | 8648 | signal_print_update (int signo, int state) |
d4f3574e SS |
8649 | { |
8650 | int ret = signal_print[signo]; | |
abbb1732 | 8651 | |
d4f3574e | 8652 | signal_print[signo] = state; |
2455069d | 8653 | signal_cache_update (signo); |
d4f3574e SS |
8654 | return ret; |
8655 | } | |
8656 | ||
488f131b | 8657 | int |
7bda5e4a | 8658 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8659 | { |
8660 | int ret = signal_program[signo]; | |
abbb1732 | 8661 | |
d4f3574e | 8662 | signal_program[signo] = state; |
2455069d | 8663 | signal_cache_update (signo); |
d4f3574e SS |
8664 | return ret; |
8665 | } | |
8666 | ||
ab04a2af TT |
8667 | /* Update the global 'signal_catch' from INFO and notify the |
8668 | target. */ | |
8669 | ||
8670 | void | |
8671 | signal_catch_update (const unsigned int *info) | |
8672 | { | |
8673 | int i; | |
8674 | ||
8675 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8676 | signal_catch[i] = info[i] > 0; | |
8677 | signal_cache_update (-1); | |
adc6a863 | 8678 | target_pass_signals (signal_pass); |
ab04a2af TT |
8679 | } |
8680 | ||
c906108c | 8681 | static void |
96baa820 | 8682 | sig_print_header (void) |
c906108c | 8683 | { |
3e43a32a MS |
8684 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8685 | "to program\tDescription\n")); | |
c906108c SS |
8686 | } |
8687 | ||
8688 | static void | |
2ea28649 | 8689 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8690 | { |
2ea28649 | 8691 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8692 | int name_padding = 13 - strlen (name); |
96baa820 | 8693 | |
c906108c SS |
8694 | if (name_padding <= 0) |
8695 | name_padding = 0; | |
8696 | ||
8697 | printf_filtered ("%s", name); | |
488f131b | 8698 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8699 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8700 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8701 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8702 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8703 | } |
8704 | ||
8705 | /* Specify how various signals in the inferior should be handled. */ | |
8706 | ||
8707 | static void | |
0b39b52e | 8708 | handle_command (const char *args, int from_tty) |
c906108c | 8709 | { |
c906108c | 8710 | int digits, wordlen; |
b926417a | 8711 | int sigfirst, siglast; |
2ea28649 | 8712 | enum gdb_signal oursig; |
c906108c | 8713 | int allsigs; |
c906108c SS |
8714 | |
8715 | if (args == NULL) | |
8716 | { | |
e2e0b3e5 | 8717 | error_no_arg (_("signal to handle")); |
c906108c SS |
8718 | } |
8719 | ||
1777feb0 | 8720 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8721 | |
adc6a863 PA |
8722 | const size_t nsigs = GDB_SIGNAL_LAST; |
8723 | unsigned char sigs[nsigs] {}; | |
c906108c | 8724 | |
1777feb0 | 8725 | /* Break the command line up into args. */ |
c906108c | 8726 | |
773a1edc | 8727 | gdb_argv built_argv (args); |
c906108c SS |
8728 | |
8729 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8730 | actions. Signal numbers and signal names may be interspersed with | |
8731 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8732 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8733 | |
773a1edc | 8734 | for (char *arg : built_argv) |
c906108c | 8735 | { |
773a1edc TT |
8736 | wordlen = strlen (arg); |
8737 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8738 | {; |
8739 | } | |
8740 | allsigs = 0; | |
8741 | sigfirst = siglast = -1; | |
8742 | ||
773a1edc | 8743 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8744 | { |
8745 | /* Apply action to all signals except those used by the | |
1777feb0 | 8746 | debugger. Silently skip those. */ |
c906108c SS |
8747 | allsigs = 1; |
8748 | sigfirst = 0; | |
8749 | siglast = nsigs - 1; | |
8750 | } | |
773a1edc | 8751 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8752 | { |
8753 | SET_SIGS (nsigs, sigs, signal_stop); | |
8754 | SET_SIGS (nsigs, sigs, signal_print); | |
8755 | } | |
773a1edc | 8756 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8757 | { |
8758 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8759 | } | |
773a1edc | 8760 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8761 | { |
8762 | SET_SIGS (nsigs, sigs, signal_print); | |
8763 | } | |
773a1edc | 8764 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8765 | { |
8766 | SET_SIGS (nsigs, sigs, signal_program); | |
8767 | } | |
773a1edc | 8768 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8769 | { |
8770 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8771 | } | |
773a1edc | 8772 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8773 | { |
8774 | SET_SIGS (nsigs, sigs, signal_program); | |
8775 | } | |
773a1edc | 8776 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8777 | { |
8778 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8779 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8780 | } | |
773a1edc | 8781 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8782 | { |
8783 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8784 | } | |
8785 | else if (digits > 0) | |
8786 | { | |
8787 | /* It is numeric. The numeric signal refers to our own | |
8788 | internal signal numbering from target.h, not to host/target | |
8789 | signal number. This is a feature; users really should be | |
8790 | using symbolic names anyway, and the common ones like | |
8791 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8792 | ||
8793 | sigfirst = siglast = (int) | |
773a1edc TT |
8794 | gdb_signal_from_command (atoi (arg)); |
8795 | if (arg[digits] == '-') | |
c906108c SS |
8796 | { |
8797 | siglast = (int) | |
773a1edc | 8798 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8799 | } |
8800 | if (sigfirst > siglast) | |
8801 | { | |
1777feb0 | 8802 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8803 | std::swap (sigfirst, siglast); |
c906108c SS |
8804 | } |
8805 | } | |
8806 | else | |
8807 | { | |
773a1edc | 8808 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8809 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8810 | { |
8811 | sigfirst = siglast = (int) oursig; | |
8812 | } | |
8813 | else | |
8814 | { | |
8815 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8816 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8817 | } |
8818 | } | |
8819 | ||
8820 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8821 | which signals to apply actions to. */ |
c906108c | 8822 | |
b926417a | 8823 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8824 | { |
2ea28649 | 8825 | switch ((enum gdb_signal) signum) |
c906108c | 8826 | { |
a493e3e2 PA |
8827 | case GDB_SIGNAL_TRAP: |
8828 | case GDB_SIGNAL_INT: | |
c906108c SS |
8829 | if (!allsigs && !sigs[signum]) |
8830 | { | |
9e2f0ad4 | 8831 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8832 | Are you sure you want to change it? "), |
2ea28649 | 8833 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8834 | { |
8835 | sigs[signum] = 1; | |
8836 | } | |
8837 | else | |
c119e040 | 8838 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8839 | } |
8840 | break; | |
a493e3e2 PA |
8841 | case GDB_SIGNAL_0: |
8842 | case GDB_SIGNAL_DEFAULT: | |
8843 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8844 | /* Make sure that "all" doesn't print these. */ |
8845 | break; | |
8846 | default: | |
8847 | sigs[signum] = 1; | |
8848 | break; | |
8849 | } | |
8850 | } | |
c906108c SS |
8851 | } |
8852 | ||
b926417a | 8853 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8854 | if (sigs[signum]) |
8855 | { | |
2455069d | 8856 | signal_cache_update (-1); |
adc6a863 PA |
8857 | target_pass_signals (signal_pass); |
8858 | target_program_signals (signal_program); | |
c906108c | 8859 | |
3a031f65 PA |
8860 | if (from_tty) |
8861 | { | |
8862 | /* Show the results. */ | |
8863 | sig_print_header (); | |
8864 | for (; signum < nsigs; signum++) | |
8865 | if (sigs[signum]) | |
aead7601 | 8866 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8867 | } |
8868 | ||
8869 | break; | |
8870 | } | |
c906108c SS |
8871 | } |
8872 | ||
de0bea00 MF |
8873 | /* Complete the "handle" command. */ |
8874 | ||
eb3ff9a5 | 8875 | static void |
de0bea00 | 8876 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8877 | completion_tracker &tracker, |
6f937416 | 8878 | const char *text, const char *word) |
de0bea00 | 8879 | { |
de0bea00 MF |
8880 | static const char * const keywords[] = |
8881 | { | |
8882 | "all", | |
8883 | "stop", | |
8884 | "ignore", | |
8885 | "print", | |
8886 | "pass", | |
8887 | "nostop", | |
8888 | "noignore", | |
8889 | "noprint", | |
8890 | "nopass", | |
8891 | NULL, | |
8892 | }; | |
8893 | ||
eb3ff9a5 PA |
8894 | signal_completer (ignore, tracker, text, word); |
8895 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8896 | } |
8897 | ||
2ea28649 PA |
8898 | enum gdb_signal |
8899 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8900 | { |
8901 | if (num >= 1 && num <= 15) | |
2ea28649 | 8902 | return (enum gdb_signal) num; |
ed01b82c PA |
8903 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8904 | Use \"info signals\" for a list of symbolic signals.")); | |
8905 | } | |
8906 | ||
c906108c SS |
8907 | /* Print current contents of the tables set by the handle command. |
8908 | It is possible we should just be printing signals actually used | |
8909 | by the current target (but for things to work right when switching | |
8910 | targets, all signals should be in the signal tables). */ | |
8911 | ||
8912 | static void | |
1d12d88f | 8913 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8914 | { |
2ea28649 | 8915 | enum gdb_signal oursig; |
abbb1732 | 8916 | |
c906108c SS |
8917 | sig_print_header (); |
8918 | ||
8919 | if (signum_exp) | |
8920 | { | |
8921 | /* First see if this is a symbol name. */ | |
2ea28649 | 8922 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8923 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8924 | { |
8925 | /* No, try numeric. */ | |
8926 | oursig = | |
2ea28649 | 8927 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8928 | } |
8929 | sig_print_info (oursig); | |
8930 | return; | |
8931 | } | |
8932 | ||
8933 | printf_filtered ("\n"); | |
8934 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8935 | for (oursig = GDB_SIGNAL_FIRST; |
8936 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8937 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8938 | { |
8939 | QUIT; | |
8940 | ||
a493e3e2 PA |
8941 | if (oursig != GDB_SIGNAL_UNKNOWN |
8942 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8943 | sig_print_info (oursig); |
8944 | } | |
8945 | ||
3e43a32a MS |
8946 | printf_filtered (_("\nUse the \"handle\" command " |
8947 | "to change these tables.\n")); | |
c906108c | 8948 | } |
4aa995e1 PA |
8949 | |
8950 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8951 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8952 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8953 | also dependent on which thread you have selected. |
8954 | ||
8955 | 1. making $_siginfo be an internalvar that creates a new value on | |
8956 | access. | |
8957 | ||
8958 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8959 | ||
8960 | /* This function implements the lval_computed support for reading a | |
8961 | $_siginfo value. */ | |
8962 | ||
8963 | static void | |
8964 | siginfo_value_read (struct value *v) | |
8965 | { | |
8966 | LONGEST transferred; | |
8967 | ||
a911d87a PA |
8968 | /* If we can access registers, so can we access $_siginfo. Likewise |
8969 | vice versa. */ | |
8970 | validate_registers_access (); | |
c709acd1 | 8971 | |
4aa995e1 | 8972 | transferred = |
8b88a78e | 8973 | target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, |
4aa995e1 PA |
8974 | NULL, |
8975 | value_contents_all_raw (v), | |
8976 | value_offset (v), | |
8977 | TYPE_LENGTH (value_type (v))); | |
8978 | ||
8979 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8980 | error (_("Unable to read siginfo")); | |
8981 | } | |
8982 | ||
8983 | /* This function implements the lval_computed support for writing a | |
8984 | $_siginfo value. */ | |
8985 | ||
8986 | static void | |
8987 | siginfo_value_write (struct value *v, struct value *fromval) | |
8988 | { | |
8989 | LONGEST transferred; | |
8990 | ||
a911d87a PA |
8991 | /* If we can access registers, so can we access $_siginfo. Likewise |
8992 | vice versa. */ | |
8993 | validate_registers_access (); | |
c709acd1 | 8994 | |
8b88a78e | 8995 | transferred = target_write (current_top_target (), |
4aa995e1 PA |
8996 | TARGET_OBJECT_SIGNAL_INFO, |
8997 | NULL, | |
8998 | value_contents_all_raw (fromval), | |
8999 | value_offset (v), | |
9000 | TYPE_LENGTH (value_type (fromval))); | |
9001 | ||
9002 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
9003 | error (_("Unable to write siginfo")); | |
9004 | } | |
9005 | ||
c8f2448a | 9006 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
9007 | { |
9008 | siginfo_value_read, | |
9009 | siginfo_value_write | |
9010 | }; | |
9011 | ||
9012 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
9013 | the current thread using architecture GDBARCH. Return a void value |
9014 | if there's no object available. */ | |
4aa995e1 | 9015 | |
2c0b251b | 9016 | static struct value * |
22d2b532 SDJ |
9017 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
9018 | void *ignore) | |
4aa995e1 | 9019 | { |
4aa995e1 | 9020 | if (target_has_stack |
d7e15655 | 9021 | && inferior_ptid != null_ptid |
78267919 | 9022 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 9023 | { |
78267919 | 9024 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 9025 | |
78267919 | 9026 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
9027 | } |
9028 | ||
78267919 | 9029 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
9030 | } |
9031 | ||
c906108c | 9032 | \f |
16c381f0 JK |
9033 | /* infcall_suspend_state contains state about the program itself like its |
9034 | registers and any signal it received when it last stopped. | |
9035 | This state must be restored regardless of how the inferior function call | |
9036 | ends (either successfully, or after it hits a breakpoint or signal) | |
9037 | if the program is to properly continue where it left off. */ | |
9038 | ||
6bf78e29 | 9039 | class infcall_suspend_state |
7a292a7a | 9040 | { |
6bf78e29 AB |
9041 | public: |
9042 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
9043 | once the inferior function call has finished. */ | |
9044 | infcall_suspend_state (struct gdbarch *gdbarch, | |
9045 | const struct thread_info *tp, | |
9046 | struct regcache *regcache) | |
9047 | : m_thread_suspend (tp->suspend), | |
9048 | m_registers (new readonly_detached_regcache (*regcache)) | |
9049 | { | |
9050 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
9051 | ||
9052 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
9053 | { | |
9054 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
9055 | size_t len = TYPE_LENGTH (type); | |
9056 | ||
9057 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); | |
9058 | ||
9059 | if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
9060 | siginfo_data.get (), 0, len) != len) | |
9061 | { | |
9062 | /* Errors ignored. */ | |
9063 | siginfo_data.reset (nullptr); | |
9064 | } | |
9065 | } | |
9066 | ||
9067 | if (siginfo_data) | |
9068 | { | |
9069 | m_siginfo_gdbarch = gdbarch; | |
9070 | m_siginfo_data = std::move (siginfo_data); | |
9071 | } | |
9072 | } | |
9073 | ||
9074 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 9075 | |
6bf78e29 AB |
9076 | readonly_detached_regcache *registers () const |
9077 | { | |
9078 | return m_registers.get (); | |
9079 | } | |
9080 | ||
9081 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
9082 | ||
9083 | void restore (struct gdbarch *gdbarch, | |
9084 | struct thread_info *tp, | |
9085 | struct regcache *regcache) const | |
9086 | { | |
9087 | tp->suspend = m_thread_suspend; | |
9088 | ||
9089 | if (m_siginfo_gdbarch == gdbarch) | |
9090 | { | |
9091 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
9092 | ||
9093 | /* Errors ignored. */ | |
9094 | target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
9095 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); | |
9096 | } | |
9097 | ||
9098 | /* The inferior can be gone if the user types "print exit(0)" | |
9099 | (and perhaps other times). */ | |
9100 | if (target_has_execution) | |
9101 | /* NB: The register write goes through to the target. */ | |
9102 | regcache->restore (registers ()); | |
9103 | } | |
9104 | ||
9105 | private: | |
9106 | /* How the current thread stopped before the inferior function call was | |
9107 | executed. */ | |
9108 | struct thread_suspend_state m_thread_suspend; | |
9109 | ||
9110 | /* The registers before the inferior function call was executed. */ | |
9111 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 9112 | |
35515841 | 9113 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 9114 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
9115 | |
9116 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
9117 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
9118 | content would be invalid. */ | |
6bf78e29 | 9119 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
9120 | }; |
9121 | ||
cb524840 TT |
9122 | infcall_suspend_state_up |
9123 | save_infcall_suspend_state () | |
b89667eb | 9124 | { |
b89667eb | 9125 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 9126 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9127 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 9128 | |
6bf78e29 AB |
9129 | infcall_suspend_state_up inf_state |
9130 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 9131 | |
6bf78e29 AB |
9132 | /* Having saved the current state, adjust the thread state, discarding |
9133 | any stop signal information. The stop signal is not useful when | |
9134 | starting an inferior function call, and run_inferior_call will not use | |
9135 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 9136 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 9137 | |
b89667eb DE |
9138 | return inf_state; |
9139 | } | |
9140 | ||
9141 | /* Restore inferior session state to INF_STATE. */ | |
9142 | ||
9143 | void | |
16c381f0 | 9144 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
9145 | { |
9146 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 9147 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9148 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 9149 | |
6bf78e29 | 9150 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 9151 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
9152 | } |
9153 | ||
b89667eb | 9154 | void |
16c381f0 | 9155 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 9156 | { |
dd848631 | 9157 | delete inf_state; |
b89667eb DE |
9158 | } |
9159 | ||
daf6667d | 9160 | readonly_detached_regcache * |
16c381f0 | 9161 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 9162 | { |
6bf78e29 | 9163 | return inf_state->registers (); |
b89667eb DE |
9164 | } |
9165 | ||
16c381f0 JK |
9166 | /* infcall_control_state contains state regarding gdb's control of the |
9167 | inferior itself like stepping control. It also contains session state like | |
9168 | the user's currently selected frame. */ | |
b89667eb | 9169 | |
16c381f0 | 9170 | struct infcall_control_state |
b89667eb | 9171 | { |
16c381f0 JK |
9172 | struct thread_control_state thread_control; |
9173 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
9174 | |
9175 | /* Other fields: */ | |
ee841dd8 TT |
9176 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
9177 | int stopped_by_random_signal = 0; | |
7a292a7a | 9178 | |
b89667eb | 9179 | /* ID if the selected frame when the inferior function call was made. */ |
ee841dd8 | 9180 | struct frame_id selected_frame_id {}; |
7a292a7a SS |
9181 | }; |
9182 | ||
c906108c | 9183 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9184 | connection. */ |
c906108c | 9185 | |
cb524840 TT |
9186 | infcall_control_state_up |
9187 | save_infcall_control_state () | |
c906108c | 9188 | { |
cb524840 | 9189 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9190 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9191 | struct inferior *inf = current_inferior (); |
7a292a7a | 9192 | |
16c381f0 JK |
9193 | inf_status->thread_control = tp->control; |
9194 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9195 | |
8358c15c | 9196 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9197 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9198 | |
16c381f0 JK |
9199 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9200 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9201 | hand them back the original chain when restore_infcall_control_state is | |
9202 | called. */ | |
9203 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9204 | |
9205 | /* Other fields: */ | |
9206 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9207 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9208 | |
206415a3 | 9209 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 9210 | |
7a292a7a | 9211 | return inf_status; |
c906108c SS |
9212 | } |
9213 | ||
bf469271 PA |
9214 | static void |
9215 | restore_selected_frame (const frame_id &fid) | |
c906108c | 9216 | { |
bf469271 | 9217 | frame_info *frame = frame_find_by_id (fid); |
c906108c | 9218 | |
aa0cd9c1 AC |
9219 | /* If inf_status->selected_frame_id is NULL, there was no previously |
9220 | selected frame. */ | |
101dcfbe | 9221 | if (frame == NULL) |
c906108c | 9222 | { |
8a3fe4f8 | 9223 | warning (_("Unable to restore previously selected frame.")); |
bf469271 | 9224 | return; |
c906108c SS |
9225 | } |
9226 | ||
0f7d239c | 9227 | select_frame (frame); |
c906108c SS |
9228 | } |
9229 | ||
b89667eb DE |
9230 | /* Restore inferior session state to INF_STATUS. */ |
9231 | ||
c906108c | 9232 | void |
16c381f0 | 9233 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9234 | { |
4e1c45ea | 9235 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9236 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9237 | |
8358c15c JK |
9238 | if (tp->control.step_resume_breakpoint) |
9239 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9240 | ||
5b79abe7 TT |
9241 | if (tp->control.exception_resume_breakpoint) |
9242 | tp->control.exception_resume_breakpoint->disposition | |
9243 | = disp_del_at_next_stop; | |
9244 | ||
d82142e2 | 9245 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9246 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9247 | |
16c381f0 JK |
9248 | tp->control = inf_status->thread_control; |
9249 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9250 | |
9251 | /* Other fields: */ | |
9252 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9253 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9254 | |
b89667eb | 9255 | if (target_has_stack) |
c906108c | 9256 | { |
bf469271 | 9257 | /* The point of the try/catch is that if the stack is clobbered, |
101dcfbe AC |
9258 | walking the stack might encounter a garbage pointer and |
9259 | error() trying to dereference it. */ | |
a70b8144 | 9260 | try |
bf469271 PA |
9261 | { |
9262 | restore_selected_frame (inf_status->selected_frame_id); | |
9263 | } | |
230d2906 | 9264 | catch (const gdb_exception_error &ex) |
bf469271 PA |
9265 | { |
9266 | exception_fprintf (gdb_stderr, ex, | |
9267 | "Unable to restore previously selected frame:\n"); | |
9268 | /* Error in restoring the selected frame. Select the | |
9269 | innermost frame. */ | |
9270 | select_frame (get_current_frame ()); | |
9271 | } | |
c906108c | 9272 | } |
c906108c | 9273 | |
ee841dd8 | 9274 | delete inf_status; |
7a292a7a | 9275 | } |
c906108c SS |
9276 | |
9277 | void | |
16c381f0 | 9278 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9279 | { |
8358c15c JK |
9280 | if (inf_status->thread_control.step_resume_breakpoint) |
9281 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9282 | = disp_del_at_next_stop; | |
9283 | ||
5b79abe7 TT |
9284 | if (inf_status->thread_control.exception_resume_breakpoint) |
9285 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9286 | = disp_del_at_next_stop; | |
9287 | ||
1777feb0 | 9288 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9289 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9290 | |
ee841dd8 | 9291 | delete inf_status; |
7a292a7a | 9292 | } |
b89667eb | 9293 | \f |
7f89fd65 | 9294 | /* See infrun.h. */ |
0c557179 SDJ |
9295 | |
9296 | void | |
9297 | clear_exit_convenience_vars (void) | |
9298 | { | |
9299 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9300 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9301 | } | |
c5aa993b | 9302 | \f |
488f131b | 9303 | |
b2175913 MS |
9304 | /* User interface for reverse debugging: |
9305 | Set exec-direction / show exec-direction commands | |
9306 | (returns error unless target implements to_set_exec_direction method). */ | |
9307 | ||
170742de | 9308 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9309 | static const char exec_forward[] = "forward"; |
9310 | static const char exec_reverse[] = "reverse"; | |
9311 | static const char *exec_direction = exec_forward; | |
40478521 | 9312 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9313 | exec_forward, |
9314 | exec_reverse, | |
9315 | NULL | |
9316 | }; | |
9317 | ||
9318 | static void | |
eb4c3f4a | 9319 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9320 | struct cmd_list_element *cmd) |
9321 | { | |
9322 | if (target_can_execute_reverse) | |
9323 | { | |
9324 | if (!strcmp (exec_direction, exec_forward)) | |
9325 | execution_direction = EXEC_FORWARD; | |
9326 | else if (!strcmp (exec_direction, exec_reverse)) | |
9327 | execution_direction = EXEC_REVERSE; | |
9328 | } | |
8bbed405 MS |
9329 | else |
9330 | { | |
9331 | exec_direction = exec_forward; | |
9332 | error (_("Target does not support this operation.")); | |
9333 | } | |
b2175913 MS |
9334 | } |
9335 | ||
9336 | static void | |
9337 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9338 | struct cmd_list_element *cmd, const char *value) | |
9339 | { | |
9340 | switch (execution_direction) { | |
9341 | case EXEC_FORWARD: | |
9342 | fprintf_filtered (out, _("Forward.\n")); | |
9343 | break; | |
9344 | case EXEC_REVERSE: | |
9345 | fprintf_filtered (out, _("Reverse.\n")); | |
9346 | break; | |
b2175913 | 9347 | default: |
d8b34453 PA |
9348 | internal_error (__FILE__, __LINE__, |
9349 | _("bogus execution_direction value: %d"), | |
9350 | (int) execution_direction); | |
b2175913 MS |
9351 | } |
9352 | } | |
9353 | ||
d4db2f36 PA |
9354 | static void |
9355 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9356 | struct cmd_list_element *c, const char *value) | |
9357 | { | |
3e43a32a MS |
9358 | fprintf_filtered (file, _("Resuming the execution of threads " |
9359 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9360 | } |
ad52ddc6 | 9361 | |
22d2b532 SDJ |
9362 | /* Implementation of `siginfo' variable. */ |
9363 | ||
9364 | static const struct internalvar_funcs siginfo_funcs = | |
9365 | { | |
9366 | siginfo_make_value, | |
9367 | NULL, | |
9368 | NULL | |
9369 | }; | |
9370 | ||
372316f1 PA |
9371 | /* Callback for infrun's target events source. This is marked when a |
9372 | thread has a pending status to process. */ | |
9373 | ||
9374 | static void | |
9375 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9376 | { | |
372316f1 PA |
9377 | inferior_event_handler (INF_REG_EVENT, NULL); |
9378 | } | |
9379 | ||
6c265988 | 9380 | void _initialize_infrun (); |
c906108c | 9381 | void |
6c265988 | 9382 | _initialize_infrun () |
c906108c | 9383 | { |
de0bea00 | 9384 | struct cmd_list_element *c; |
c906108c | 9385 | |
372316f1 PA |
9386 | /* Register extra event sources in the event loop. */ |
9387 | infrun_async_inferior_event_token | |
9388 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
9389 | ||
11db9430 | 9390 | add_info ("signals", info_signals_command, _("\ |
1bedd215 AC |
9391 | What debugger does when program gets various signals.\n\ |
9392 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9393 | add_info_alias ("handle", "signals", 0); |
9394 | ||
de0bea00 | 9395 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9396 | Specify how to handle signals.\n\ |
486c7739 | 9397 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9398 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9399 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9400 | will be displayed instead.\n\ |
9401 | \n\ | |
c906108c SS |
9402 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9403 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9404 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9405 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9406 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9407 | \n\ |
1bedd215 | 9408 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9409 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9410 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9411 | Print means print a message if this signal happens.\n\ | |
9412 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9413 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9414 | Pass and Stop may be combined.\n\ |
9415 | \n\ | |
9416 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9417 | may be interspersed with actions, with the actions being performed for\n\ | |
9418 | all signals cumulatively specified.")); | |
de0bea00 | 9419 | set_cmd_completer (c, handle_completer); |
486c7739 | 9420 | |
c906108c | 9421 | if (!dbx_commands) |
1a966eab AC |
9422 | stop_command = add_cmd ("stop", class_obscure, |
9423 | not_just_help_class_command, _("\ | |
9424 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9425 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9426 | of the program stops."), &cmdlist); |
c906108c | 9427 | |
ccce17b0 | 9428 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9429 | Set inferior debugging."), _("\ |
9430 | Show inferior debugging."), _("\ | |
9431 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9432 | NULL, |
9433 | show_debug_infrun, | |
9434 | &setdebuglist, &showdebuglist); | |
527159b7 | 9435 | |
3e43a32a MS |
9436 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9437 | &debug_displaced, _("\ | |
237fc4c9 PA |
9438 | Set displaced stepping debugging."), _("\ |
9439 | Show displaced stepping debugging."), _("\ | |
9440 | When non-zero, displaced stepping specific debugging is enabled."), | |
9441 | NULL, | |
9442 | show_debug_displaced, | |
9443 | &setdebuglist, &showdebuglist); | |
9444 | ||
ad52ddc6 PA |
9445 | add_setshow_boolean_cmd ("non-stop", no_class, |
9446 | &non_stop_1, _("\ | |
9447 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9448 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9449 | When debugging a multi-threaded program and this setting is\n\ | |
9450 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9451 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9452 | all other threads in the program while you interact with the thread of\n\ | |
9453 | interest. When you continue or step a thread, you can allow the other\n\ | |
9454 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9455 | thread's state, all threads stop.\n\ | |
9456 | \n\ | |
9457 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9458 | to run freely. You'll be able to step each thread independently,\n\ | |
9459 | leave it stopped or free to run as needed."), | |
9460 | set_non_stop, | |
9461 | show_non_stop, | |
9462 | &setlist, | |
9463 | &showlist); | |
9464 | ||
adc6a863 | 9465 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9466 | { |
9467 | signal_stop[i] = 1; | |
9468 | signal_print[i] = 1; | |
9469 | signal_program[i] = 1; | |
ab04a2af | 9470 | signal_catch[i] = 0; |
c906108c SS |
9471 | } |
9472 | ||
4d9d9d04 PA |
9473 | /* Signals caused by debugger's own actions should not be given to |
9474 | the program afterwards. | |
9475 | ||
9476 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9477 | explicitly specifies that it should be delivered to the target | |
9478 | program. Typically, that would occur when a user is debugging a | |
9479 | target monitor on a simulator: the target monitor sets a | |
9480 | breakpoint; the simulator encounters this breakpoint and halts | |
9481 | the simulation handing control to GDB; GDB, noting that the stop | |
9482 | address doesn't map to any known breakpoint, returns control back | |
9483 | to the simulator; the simulator then delivers the hardware | |
9484 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9485 | debugged. */ | |
a493e3e2 PA |
9486 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9487 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9488 | |
9489 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9490 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9491 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9492 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9493 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9494 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9495 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9496 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9497 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9498 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9499 | signal_print[GDB_SIGNAL_IO] = 0; | |
9500 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9501 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9502 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9503 | signal_print[GDB_SIGNAL_URG] = 0; | |
9504 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9505 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9506 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9507 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9508 | |
cd0fc7c3 SS |
9509 | /* These signals are used internally by user-level thread |
9510 | implementations. (See signal(5) on Solaris.) Like the above | |
9511 | signals, a healthy program receives and handles them as part of | |
9512 | its normal operation. */ | |
a493e3e2 PA |
9513 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9514 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9515 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9516 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9517 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9518 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9519 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9520 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9521 | |
2455069d UW |
9522 | /* Update cached state. */ |
9523 | signal_cache_update (-1); | |
9524 | ||
85c07804 AC |
9525 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9526 | &stop_on_solib_events, _("\ | |
9527 | Set stopping for shared library events."), _("\ | |
9528 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9529 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9530 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9531 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9532 | set_stop_on_solib_events, |
920d2a44 | 9533 | show_stop_on_solib_events, |
85c07804 | 9534 | &setlist, &showlist); |
c906108c | 9535 | |
7ab04401 AC |
9536 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9537 | follow_fork_mode_kind_names, | |
9538 | &follow_fork_mode_string, _("\ | |
9539 | Set debugger response to a program call of fork or vfork."), _("\ | |
9540 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9541 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9542 | parent - the original process is debugged after a fork\n\ | |
9543 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9544 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9545 | By default, the debugger will follow the parent process."), |
9546 | NULL, | |
920d2a44 | 9547 | show_follow_fork_mode_string, |
7ab04401 AC |
9548 | &setlist, &showlist); |
9549 | ||
6c95b8df PA |
9550 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9551 | follow_exec_mode_names, | |
9552 | &follow_exec_mode_string, _("\ | |
9553 | Set debugger response to a program call of exec."), _("\ | |
9554 | Show debugger response to a program call of exec."), _("\ | |
9555 | An exec call replaces the program image of a process.\n\ | |
9556 | \n\ | |
9557 | follow-exec-mode can be:\n\ | |
9558 | \n\ | |
cce7e648 | 9559 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9560 | to this new inferior. The program the process was running before\n\ |
9561 | the exec call can be restarted afterwards by restarting the original\n\ | |
9562 | inferior.\n\ | |
9563 | \n\ | |
9564 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9565 | The new executable image replaces the previous executable loaded in\n\ | |
9566 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9567 | the executable the process was running after the exec call.\n\ | |
9568 | \n\ | |
9569 | By default, the debugger will use the same inferior."), | |
9570 | NULL, | |
9571 | show_follow_exec_mode_string, | |
9572 | &setlist, &showlist); | |
9573 | ||
7ab04401 AC |
9574 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9575 | scheduler_enums, &scheduler_mode, _("\ | |
9576 | Set mode for locking scheduler during execution."), _("\ | |
9577 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9578 | off == no locking (threads may preempt at any time)\n\ |
9579 | on == full locking (no thread except the current thread may run)\n\ | |
9580 | This applies to both normal execution and replay mode.\n\ | |
9581 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9582 | In this mode, other threads may run during other commands.\n\ | |
9583 | This applies to both normal execution and replay mode.\n\ | |
9584 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9585 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9586 | show_scheduler_mode, |
7ab04401 | 9587 | &setlist, &showlist); |
5fbbeb29 | 9588 | |
d4db2f36 PA |
9589 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9590 | Set mode for resuming threads of all processes."), _("\ | |
9591 | Show mode for resuming threads of all processes."), _("\ | |
9592 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9593 | threads of all processes. When off (which is the default), execution\n\ | |
9594 | commands only resume the threads of the current process. The set of\n\ | |
9595 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9596 | mode (see help set scheduler-locking)."), | |
9597 | NULL, | |
9598 | show_schedule_multiple, | |
9599 | &setlist, &showlist); | |
9600 | ||
5bf193a2 AC |
9601 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9602 | Set mode of the step operation."), _("\ | |
9603 | Show mode of the step operation."), _("\ | |
9604 | When set, doing a step over a function without debug line information\n\ | |
9605 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9606 | function is skipped and the step command stops at a different source line."), | |
9607 | NULL, | |
920d2a44 | 9608 | show_step_stop_if_no_debug, |
5bf193a2 | 9609 | &setlist, &showlist); |
ca6724c1 | 9610 | |
72d0e2c5 YQ |
9611 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9612 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9613 | Set debugger's willingness to use displaced stepping."), _("\ |
9614 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9615 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9616 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9617 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9618 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9619 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9620 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9621 | NULL, |
9622 | show_can_use_displaced_stepping, | |
9623 | &setlist, &showlist); | |
237fc4c9 | 9624 | |
b2175913 MS |
9625 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9626 | &exec_direction, _("Set direction of execution.\n\ | |
9627 | Options are 'forward' or 'reverse'."), | |
9628 | _("Show direction of execution (forward/reverse)."), | |
9629 | _("Tells gdb whether to execute forward or backward."), | |
9630 | set_exec_direction_func, show_exec_direction_func, | |
9631 | &setlist, &showlist); | |
9632 | ||
6c95b8df PA |
9633 | /* Set/show detach-on-fork: user-settable mode. */ |
9634 | ||
9635 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9636 | Set whether gdb will detach the child of a fork."), _("\ | |
9637 | Show whether gdb will detach the child of a fork."), _("\ | |
9638 | Tells gdb whether to detach the child of a fork."), | |
9639 | NULL, NULL, &setlist, &showlist); | |
9640 | ||
03583c20 UW |
9641 | /* Set/show disable address space randomization mode. */ |
9642 | ||
9643 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9644 | &disable_randomization, _("\ | |
9645 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9646 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9647 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9648 | address space is disabled. Standalone programs run with the randomization\n\ | |
9649 | enabled by default on some platforms."), | |
9650 | &set_disable_randomization, | |
9651 | &show_disable_randomization, | |
9652 | &setlist, &showlist); | |
9653 | ||
ca6724c1 | 9654 | /* ptid initializations */ |
ca6724c1 KB |
9655 | inferior_ptid = null_ptid; |
9656 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9657 | |
76727919 TT |
9658 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed); |
9659 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested); | |
9660 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit); | |
9661 | gdb::observers::inferior_exit.attach (infrun_inferior_exit); | |
4aa995e1 PA |
9662 | |
9663 | /* Explicitly create without lookup, since that tries to create a | |
9664 | value with a void typed value, and when we get here, gdbarch | |
9665 | isn't initialized yet. At this point, we're quite sure there | |
9666 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9667 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9668 | |
9669 | add_setshow_boolean_cmd ("observer", no_class, | |
9670 | &observer_mode_1, _("\ | |
9671 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9672 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9673 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9674 | affect its execution. Registers and memory may not be changed,\n\ | |
9675 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9676 | or signalled."), | |
9677 | set_observer_mode, | |
9678 | show_observer_mode, | |
9679 | &setlist, | |
9680 | &showlist); | |
c906108c | 9681 | } |