Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
88b9d363 | 4 | Copyright (C) 1986-2022 Free Software Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 11 | (at your option) any later version. |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | #include "defs.h" | |
bab37966 | 22 | #include "displaced-stepping.h" |
45741a9c | 23 | #include "infrun.h" |
c906108c SS |
24 | #include <ctype.h> |
25 | #include "symtab.h" | |
26 | #include "frame.h" | |
27 | #include "inferior.h" | |
28 | #include "breakpoint.h" | |
c906108c SS |
29 | #include "gdbcore.h" |
30 | #include "gdbcmd.h" | |
31 | #include "target.h" | |
2f4fcf00 | 32 | #include "target-connection.h" |
c906108c SS |
33 | #include "gdbthread.h" |
34 | #include "annotate.h" | |
1adeb98a | 35 | #include "symfile.h" |
7a292a7a | 36 | #include "top.h" |
2acceee2 | 37 | #include "inf-loop.h" |
4e052eda | 38 | #include "regcache.h" |
fd0407d6 | 39 | #include "value.h" |
76727919 | 40 | #include "observable.h" |
f636b87d | 41 | #include "language.h" |
a77053c2 | 42 | #include "solib.h" |
f17517ea | 43 | #include "main.h" |
186c406b | 44 | #include "block.h" |
034dad6f | 45 | #include "mi/mi-common.h" |
4f8d22e3 | 46 | #include "event-top.h" |
96429cc8 | 47 | #include "record.h" |
d02ed0bb | 48 | #include "record-full.h" |
edb3359d | 49 | #include "inline-frame.h" |
4efc6507 | 50 | #include "jit.h" |
06cd862c | 51 | #include "tracepoint.h" |
1bfeeb0f | 52 | #include "skip.h" |
28106bc2 SDJ |
53 | #include "probe.h" |
54 | #include "objfiles.h" | |
de0bea00 | 55 | #include "completer.h" |
9107fc8d | 56 | #include "target-descriptions.h" |
f15cb84a | 57 | #include "target-dcache.h" |
d83ad864 | 58 | #include "terminal.h" |
ff862be4 | 59 | #include "solist.h" |
400b5eca | 60 | #include "gdbsupport/event-loop.h" |
243a9253 | 61 | #include "thread-fsm.h" |
268a13a5 | 62 | #include "gdbsupport/enum-flags.h" |
5ed8105e | 63 | #include "progspace-and-thread.h" |
268a13a5 | 64 | #include "gdbsupport/gdb_optional.h" |
46a62268 | 65 | #include "arch-utils.h" |
268a13a5 TT |
66 | #include "gdbsupport/scope-exit.h" |
67 | #include "gdbsupport/forward-scope-exit.h" | |
06cc9596 | 68 | #include "gdbsupport/gdb_select.h" |
5b6d1e4f | 69 | #include <unordered_map> |
93b54c8e | 70 | #include "async-event.h" |
b161a60d SM |
71 | #include "gdbsupport/selftest.h" |
72 | #include "scoped-mock-context.h" | |
73 | #include "test-target.h" | |
ba988419 | 74 | #include "gdbsupport/common-debug.h" |
c906108c SS |
75 | |
76 | /* Prototypes for local functions */ | |
77 | ||
2ea28649 | 78 | static void sig_print_info (enum gdb_signal); |
c906108c | 79 | |
96baa820 | 80 | static void sig_print_header (void); |
c906108c | 81 | |
d83ad864 DB |
82 | static void follow_inferior_reset_breakpoints (void); |
83 | ||
c4464ade | 84 | static bool currently_stepping (struct thread_info *tp); |
a289b8f6 | 85 | |
2c03e5be | 86 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
87 | |
88 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
89 | ||
2484c66b UW |
90 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
91 | ||
c4464ade | 92 | static bool maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
8550d3b3 | 93 | |
aff4e175 AB |
94 | static void resume (gdb_signal sig); |
95 | ||
5b6d1e4f PA |
96 | static void wait_for_inferior (inferior *inf); |
97 | ||
8cc8b4da SM |
98 | static void restart_threads (struct thread_info *event_thread, |
99 | inferior *inf = nullptr); | |
100 | ||
101 | static bool start_step_over (void); | |
102 | ||
372316f1 PA |
103 | /* Asynchronous signal handler registered as event loop source for |
104 | when we have pending events ready to be passed to the core. */ | |
105 | static struct async_event_handler *infrun_async_inferior_event_token; | |
106 | ||
107 | /* Stores whether infrun_async was previously enabled or disabled. | |
108 | Starts off as -1, indicating "never enabled/disabled". */ | |
109 | static int infrun_is_async = -1; | |
110 | ||
111 | /* See infrun.h. */ | |
112 | ||
113 | void | |
114 | infrun_async (int enable) | |
115 | { | |
116 | if (infrun_is_async != enable) | |
117 | { | |
118 | infrun_is_async = enable; | |
119 | ||
1eb8556f | 120 | infrun_debug_printf ("enable=%d", enable); |
372316f1 PA |
121 | |
122 | if (enable) | |
123 | mark_async_event_handler (infrun_async_inferior_event_token); | |
124 | else | |
125 | clear_async_event_handler (infrun_async_inferior_event_token); | |
126 | } | |
127 | } | |
128 | ||
0b333c5e PA |
129 | /* See infrun.h. */ |
130 | ||
131 | void | |
132 | mark_infrun_async_event_handler (void) | |
133 | { | |
134 | mark_async_event_handler (infrun_async_inferior_event_token); | |
135 | } | |
136 | ||
5fbbeb29 CF |
137 | /* When set, stop the 'step' command if we enter a function which has |
138 | no line number information. The normal behavior is that we step | |
139 | over such function. */ | |
491144b5 | 140 | bool step_stop_if_no_debug = false; |
920d2a44 AC |
141 | static void |
142 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
143 | struct cmd_list_element *c, const char *value) | |
144 | { | |
145 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
146 | } | |
5fbbeb29 | 147 | |
b9f437de PA |
148 | /* proceed and normal_stop use this to notify the user when the |
149 | inferior stopped in a different thread than it had been running | |
150 | in. */ | |
96baa820 | 151 | |
39f77062 | 152 | static ptid_t previous_inferior_ptid; |
7a292a7a | 153 | |
07107ca6 LM |
154 | /* If set (default for legacy reasons), when following a fork, GDB |
155 | will detach from one of the fork branches, child or parent. | |
156 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
157 | setting. */ | |
158 | ||
491144b5 | 159 | static bool detach_fork = true; |
6c95b8df | 160 | |
94ba44a6 | 161 | bool debug_infrun = false; |
920d2a44 AC |
162 | static void |
163 | show_debug_infrun (struct ui_file *file, int from_tty, | |
164 | struct cmd_list_element *c, const char *value) | |
165 | { | |
166 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
167 | } | |
527159b7 | 168 | |
03583c20 UW |
169 | /* Support for disabling address space randomization. */ |
170 | ||
491144b5 | 171 | bool disable_randomization = true; |
03583c20 UW |
172 | |
173 | static void | |
174 | show_disable_randomization (struct ui_file *file, int from_tty, | |
175 | struct cmd_list_element *c, const char *value) | |
176 | { | |
177 | if (target_supports_disable_randomization ()) | |
178 | fprintf_filtered (file, | |
179 | _("Disabling randomization of debuggee's " | |
180 | "virtual address space is %s.\n"), | |
181 | value); | |
182 | else | |
183 | fputs_filtered (_("Disabling randomization of debuggee's " | |
184 | "virtual address space is unsupported on\n" | |
185 | "this platform.\n"), file); | |
186 | } | |
187 | ||
188 | static void | |
eb4c3f4a | 189 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
190 | struct cmd_list_element *c) |
191 | { | |
192 | if (!target_supports_disable_randomization ()) | |
193 | error (_("Disabling randomization of debuggee's " | |
194 | "virtual address space is unsupported on\n" | |
195 | "this platform.")); | |
196 | } | |
197 | ||
d32dc48e PA |
198 | /* User interface for non-stop mode. */ |
199 | ||
491144b5 CB |
200 | bool non_stop = false; |
201 | static bool non_stop_1 = false; | |
d32dc48e PA |
202 | |
203 | static void | |
eb4c3f4a | 204 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
205 | struct cmd_list_element *c) |
206 | { | |
55f6301a | 207 | if (target_has_execution ()) |
d32dc48e PA |
208 | { |
209 | non_stop_1 = non_stop; | |
210 | error (_("Cannot change this setting while the inferior is running.")); | |
211 | } | |
212 | ||
213 | non_stop = non_stop_1; | |
214 | } | |
215 | ||
216 | static void | |
217 | show_non_stop (struct ui_file *file, int from_tty, | |
218 | struct cmd_list_element *c, const char *value) | |
219 | { | |
220 | fprintf_filtered (file, | |
221 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
222 | value); | |
223 | } | |
224 | ||
d914c394 SS |
225 | /* "Observer mode" is somewhat like a more extreme version of |
226 | non-stop, in which all GDB operations that might affect the | |
227 | target's execution have been disabled. */ | |
228 | ||
6bd434d6 | 229 | static bool observer_mode = false; |
491144b5 | 230 | static bool observer_mode_1 = false; |
d914c394 SS |
231 | |
232 | static void | |
eb4c3f4a | 233 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
234 | struct cmd_list_element *c) |
235 | { | |
55f6301a | 236 | if (target_has_execution ()) |
d914c394 SS |
237 | { |
238 | observer_mode_1 = observer_mode; | |
239 | error (_("Cannot change this setting while the inferior is running.")); | |
240 | } | |
241 | ||
242 | observer_mode = observer_mode_1; | |
243 | ||
244 | may_write_registers = !observer_mode; | |
245 | may_write_memory = !observer_mode; | |
246 | may_insert_breakpoints = !observer_mode; | |
247 | may_insert_tracepoints = !observer_mode; | |
248 | /* We can insert fast tracepoints in or out of observer mode, | |
249 | but enable them if we're going into this mode. */ | |
250 | if (observer_mode) | |
491144b5 | 251 | may_insert_fast_tracepoints = true; |
d914c394 SS |
252 | may_stop = !observer_mode; |
253 | update_target_permissions (); | |
254 | ||
255 | /* Going *into* observer mode we must force non-stop, then | |
256 | going out we leave it that way. */ | |
257 | if (observer_mode) | |
258 | { | |
d914c394 | 259 | pagination_enabled = 0; |
491144b5 | 260 | non_stop = non_stop_1 = true; |
d914c394 SS |
261 | } |
262 | ||
263 | if (from_tty) | |
264 | printf_filtered (_("Observer mode is now %s.\n"), | |
265 | (observer_mode ? "on" : "off")); | |
266 | } | |
267 | ||
268 | static void | |
269 | show_observer_mode (struct ui_file *file, int from_tty, | |
270 | struct cmd_list_element *c, const char *value) | |
271 | { | |
272 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
273 | } | |
274 | ||
275 | /* This updates the value of observer mode based on changes in | |
276 | permissions. Note that we are deliberately ignoring the values of | |
277 | may-write-registers and may-write-memory, since the user may have | |
278 | reason to enable these during a session, for instance to turn on a | |
279 | debugging-related global. */ | |
280 | ||
281 | void | |
282 | update_observer_mode (void) | |
283 | { | |
491144b5 CB |
284 | bool newval = (!may_insert_breakpoints |
285 | && !may_insert_tracepoints | |
286 | && may_insert_fast_tracepoints | |
287 | && !may_stop | |
288 | && non_stop); | |
d914c394 SS |
289 | |
290 | /* Let the user know if things change. */ | |
291 | if (newval != observer_mode) | |
292 | printf_filtered (_("Observer mode is now %s.\n"), | |
293 | (newval ? "on" : "off")); | |
294 | ||
295 | observer_mode = observer_mode_1 = newval; | |
296 | } | |
c2c6d25f | 297 | |
c906108c SS |
298 | /* Tables of how to react to signals; the user sets them. */ |
299 | ||
adc6a863 PA |
300 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
301 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
302 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 303 | |
ab04a2af TT |
304 | /* Table of signals that are registered with "catch signal". A |
305 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
306 | signal" command. */ |
307 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 308 | |
2455069d UW |
309 | /* Table of signals that the target may silently handle. |
310 | This is automatically determined from the flags above, | |
311 | and simply cached here. */ | |
adc6a863 | 312 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 313 | |
c906108c SS |
314 | #define SET_SIGS(nsigs,sigs,flags) \ |
315 | do { \ | |
316 | int signum = (nsigs); \ | |
317 | while (signum-- > 0) \ | |
318 | if ((sigs)[signum]) \ | |
319 | (flags)[signum] = 1; \ | |
320 | } while (0) | |
321 | ||
322 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
323 | do { \ | |
324 | int signum = (nsigs); \ | |
325 | while (signum-- > 0) \ | |
326 | if ((sigs)[signum]) \ | |
327 | (flags)[signum] = 0; \ | |
328 | } while (0) | |
329 | ||
9b224c5e PA |
330 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
331 | this function is to avoid exporting `signal_program'. */ | |
332 | ||
333 | void | |
334 | update_signals_program_target (void) | |
335 | { | |
adc6a863 | 336 | target_program_signals (signal_program); |
9b224c5e PA |
337 | } |
338 | ||
1777feb0 | 339 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 340 | |
edb3359d | 341 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
342 | |
343 | /* Command list pointer for the "stop" placeholder. */ | |
344 | ||
345 | static struct cmd_list_element *stop_command; | |
346 | ||
c906108c SS |
347 | /* Nonzero if we want to give control to the user when we're notified |
348 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 349 | int stop_on_solib_events; |
f9e14852 GB |
350 | |
351 | /* Enable or disable optional shared library event breakpoints | |
352 | as appropriate when the above flag is changed. */ | |
353 | ||
354 | static void | |
eb4c3f4a TT |
355 | set_stop_on_solib_events (const char *args, |
356 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
357 | { |
358 | update_solib_breakpoints (); | |
359 | } | |
360 | ||
920d2a44 AC |
361 | static void |
362 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
363 | struct cmd_list_element *c, const char *value) | |
364 | { | |
365 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
366 | value); | |
367 | } | |
c906108c | 368 | |
c4464ade | 369 | /* True after stop if current stack frame should be printed. */ |
c906108c | 370 | |
c4464ade | 371 | static bool stop_print_frame; |
c906108c | 372 | |
5b6d1e4f PA |
373 | /* This is a cached copy of the target/ptid/waitstatus of the last |
374 | event returned by target_wait()/deprecated_target_wait_hook(). | |
375 | This information is returned by get_last_target_status(). */ | |
376 | static process_stratum_target *target_last_proc_target; | |
39f77062 | 377 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
378 | static struct target_waitstatus target_last_waitstatus; |
379 | ||
4e1c45ea | 380 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 381 | |
53904c9e AC |
382 | static const char follow_fork_mode_child[] = "child"; |
383 | static const char follow_fork_mode_parent[] = "parent"; | |
384 | ||
40478521 | 385 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
386 | follow_fork_mode_child, |
387 | follow_fork_mode_parent, | |
388 | NULL | |
ef346e04 | 389 | }; |
c906108c | 390 | |
53904c9e | 391 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
392 | static void |
393 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
394 | struct cmd_list_element *c, const char *value) | |
395 | { | |
3e43a32a MS |
396 | fprintf_filtered (file, |
397 | _("Debugger response to a program " | |
398 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
399 | value); |
400 | } | |
c906108c SS |
401 | \f |
402 | ||
d83ad864 DB |
403 | /* Handle changes to the inferior list based on the type of fork, |
404 | which process is being followed, and whether the other process | |
405 | should be detached. On entry inferior_ptid must be the ptid of | |
406 | the fork parent. At return inferior_ptid is the ptid of the | |
407 | followed inferior. */ | |
408 | ||
5ab2fbf1 SM |
409 | static bool |
410 | follow_fork_inferior (bool follow_child, bool detach_fork) | |
d83ad864 DB |
411 | { |
412 | int has_vforked; | |
79639e11 | 413 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
414 | |
415 | has_vforked = (inferior_thread ()->pending_follow.kind | |
416 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
417 | parent_ptid = inferior_ptid; |
418 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
419 | |
420 | if (has_vforked | |
421 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 422 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
423 | && !(follow_child || detach_fork || sched_multi)) |
424 | { | |
425 | /* The parent stays blocked inside the vfork syscall until the | |
426 | child execs or exits. If we don't let the child run, then | |
427 | the parent stays blocked. If we're telling the parent to run | |
428 | in the foreground, the user will not be able to ctrl-c to get | |
429 | back the terminal, effectively hanging the debug session. */ | |
430 | fprintf_filtered (gdb_stderr, _("\ | |
431 | Can not resume the parent process over vfork in the foreground while\n\ | |
432 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
433 | \"set schedule-multiple\".\n")); | |
e97007b6 | 434 | return true; |
d83ad864 DB |
435 | } |
436 | ||
8cc8b4da SM |
437 | inferior *parent_inf = current_inferior (); |
438 | gdb_assert (parent_inf->thread_waiting_for_vfork_done == nullptr); | |
439 | ||
d83ad864 DB |
440 | if (!follow_child) |
441 | { | |
442 | /* Detach new forked process? */ | |
443 | if (detach_fork) | |
444 | { | |
d83ad864 DB |
445 | /* Before detaching from the child, remove all breakpoints |
446 | from it. If we forked, then this has already been taken | |
447 | care of by infrun.c. If we vforked however, any | |
448 | breakpoint inserted in the parent is visible in the | |
449 | child, even those added while stopped in a vfork | |
450 | catchpoint. This will remove the breakpoints from the | |
451 | parent also, but they'll be reinserted below. */ | |
452 | if (has_vforked) | |
453 | { | |
454 | /* Keep breakpoints list in sync. */ | |
00431a78 | 455 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
456 | } |
457 | ||
f67c0c91 | 458 | if (print_inferior_events) |
d83ad864 | 459 | { |
8dd06f7a | 460 | /* Ensure that we have a process ptid. */ |
e99b03dc | 461 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 462 | |
223ffa71 | 463 | target_terminal::ours_for_output (); |
d83ad864 | 464 | fprintf_filtered (gdb_stdlog, |
f67c0c91 | 465 | _("[Detaching after %s from child %s]\n"), |
6f259a23 | 466 | has_vforked ? "vfork" : "fork", |
a068643d | 467 | target_pid_to_str (process_ptid).c_str ()); |
d83ad864 DB |
468 | } |
469 | } | |
470 | else | |
471 | { | |
8cc8b4da | 472 | inferior *child_inf; |
d83ad864 DB |
473 | |
474 | /* Add process to GDB's tables. */ | |
e99b03dc | 475 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 | 476 | |
d83ad864 DB |
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; |
02980c56 | 487 | child_inf->push_target (parent_inf->process_target ()); |
18493a00 PA |
488 | thread_info *child_thr |
489 | = add_thread_silent (child_inf->process_target (), 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; | |
18493a00 PA |
507 | |
508 | /* Now that the inferiors and program spaces are all | |
509 | wired up, we can switch to the child thread (which | |
510 | switches inferior and program space too). */ | |
511 | switch_to_thread (child_thr); | |
d83ad864 DB |
512 | } |
513 | else | |
514 | { | |
515 | child_inf->aspace = new_address_space (); | |
564b1e3f | 516 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
517 | child_inf->removable = 1; |
518 | set_current_program_space (child_inf->pspace); | |
519 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
520 | ||
18493a00 PA |
521 | /* solib_create_inferior_hook relies on the current |
522 | thread. */ | |
523 | switch_to_thread (child_thr); | |
524 | ||
d83ad864 DB |
525 | /* Let the shared library layer (e.g., solib-svr4) learn |
526 | about this new process, relocate the cloned exec, pull | |
527 | in shared libraries, and install the solib event | |
528 | breakpoint. If a "cloned-VM" event was propagated | |
529 | better throughout the core, this wouldn't be | |
530 | required. */ | |
122373f7 SM |
531 | scoped_restore restore_in_initial_library_scan |
532 | = make_scoped_restore (&child_inf->in_initial_library_scan, | |
533 | true); | |
d83ad864 DB |
534 | solib_create_inferior_hook (0); |
535 | } | |
d83ad864 DB |
536 | } |
537 | ||
538 | if (has_vforked) | |
539 | { | |
d83ad864 DB |
540 | /* If we detached from the child, then we have to be careful |
541 | to not insert breakpoints in the parent until the child | |
542 | is done with the shared memory region. However, if we're | |
543 | staying attached to the child, then we can and should | |
544 | insert breakpoints, so that we can debug it. A | |
545 | subsequent child exec or exit is enough to know when does | |
546 | the child stops using the parent's address space. */ | |
e6e25d5a SM |
547 | parent_inf->thread_waiting_for_vfork_done |
548 | = detach_fork ? inferior_thread () : nullptr; | |
d83ad864 DB |
549 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; |
550 | } | |
551 | } | |
552 | else | |
553 | { | |
554 | /* Follow the child. */ | |
8cc8b4da | 555 | inferior *child_inf; |
d83ad864 DB |
556 | struct program_space *parent_pspace; |
557 | ||
f67c0c91 | 558 | if (print_inferior_events) |
d83ad864 | 559 | { |
f67c0c91 SDJ |
560 | std::string parent_pid = target_pid_to_str (parent_ptid); |
561 | std::string child_pid = target_pid_to_str (child_ptid); | |
562 | ||
223ffa71 | 563 | target_terminal::ours_for_output (); |
6f259a23 | 564 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
565 | _("[Attaching after %s %s to child %s]\n"), |
566 | parent_pid.c_str (), | |
6f259a23 | 567 | has_vforked ? "vfork" : "fork", |
f67c0c91 | 568 | child_pid.c_str ()); |
d83ad864 DB |
569 | } |
570 | ||
571 | /* Add the new inferior first, so that the target_detach below | |
572 | doesn't unpush the target. */ | |
573 | ||
e99b03dc | 574 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 | 575 | |
d83ad864 DB |
576 | child_inf->attach_flag = parent_inf->attach_flag; |
577 | copy_terminal_info (child_inf, parent_inf); | |
578 | child_inf->gdbarch = parent_inf->gdbarch; | |
579 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
580 | ||
581 | parent_pspace = parent_inf->pspace; | |
582 | ||
5b6d1e4f | 583 | process_stratum_target *target = parent_inf->process_target (); |
d83ad864 | 584 | |
5b6d1e4f PA |
585 | { |
586 | /* Hold a strong reference to the target while (maybe) | |
587 | detaching the parent. Otherwise detaching could close the | |
588 | target. */ | |
589 | auto target_ref = target_ops_ref::new_reference (target); | |
590 | ||
591 | /* If we're vforking, we want to hold on to the parent until | |
592 | the child exits or execs. At child exec or exit time we | |
593 | can remove the old breakpoints from the parent and detach | |
594 | or resume debugging it. Otherwise, detach the parent now; | |
595 | we'll want to reuse it's program/address spaces, but we | |
596 | can't set them to the child before removing breakpoints | |
597 | from the parent, otherwise, the breakpoints module could | |
598 | decide to remove breakpoints from the wrong process (since | |
599 | they'd be assigned to the same address space). */ | |
600 | ||
601 | if (has_vforked) | |
602 | { | |
603 | gdb_assert (child_inf->vfork_parent == NULL); | |
604 | gdb_assert (parent_inf->vfork_child == NULL); | |
605 | child_inf->vfork_parent = parent_inf; | |
606 | child_inf->pending_detach = 0; | |
607 | parent_inf->vfork_child = child_inf; | |
608 | parent_inf->pending_detach = detach_fork; | |
5b6d1e4f PA |
609 | } |
610 | else if (detach_fork) | |
611 | { | |
612 | if (print_inferior_events) | |
613 | { | |
614 | /* Ensure that we have a process ptid. */ | |
615 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
616 | ||
617 | target_terminal::ours_for_output (); | |
618 | fprintf_filtered (gdb_stdlog, | |
619 | _("[Detaching after fork from " | |
620 | "parent %s]\n"), | |
621 | target_pid_to_str (process_ptid).c_str ()); | |
622 | } | |
8dd06f7a | 623 | |
5b6d1e4f PA |
624 | target_detach (parent_inf, 0); |
625 | parent_inf = NULL; | |
626 | } | |
6f259a23 | 627 | |
5b6d1e4f | 628 | /* Note that the detach above makes PARENT_INF dangling. */ |
d83ad864 | 629 | |
5b6d1e4f PA |
630 | /* Add the child thread to the appropriate lists, and switch |
631 | to this new thread, before cloning the program space, and | |
632 | informing the solib layer about this new process. */ | |
d83ad864 | 633 | |
5b6d1e4f | 634 | set_current_inferior (child_inf); |
02980c56 | 635 | child_inf->push_target (target); |
5b6d1e4f | 636 | } |
d83ad864 | 637 | |
18493a00 | 638 | thread_info *child_thr = add_thread_silent (target, child_ptid); |
d83ad864 DB |
639 | |
640 | /* If this is a vfork child, then the address-space is shared | |
641 | with the parent. If we detached from the parent, then we can | |
642 | reuse the parent's program/address spaces. */ | |
643 | if (has_vforked || detach_fork) | |
644 | { | |
645 | child_inf->pspace = parent_pspace; | |
646 | child_inf->aspace = child_inf->pspace->aspace; | |
5b6d1e4f PA |
647 | |
648 | exec_on_vfork (); | |
d83ad864 DB |
649 | } |
650 | else | |
651 | { | |
652 | child_inf->aspace = new_address_space (); | |
564b1e3f | 653 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
654 | child_inf->removable = 1; |
655 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
656 | set_current_program_space (child_inf->pspace); | |
657 | clone_program_space (child_inf->pspace, parent_pspace); | |
658 | ||
659 | /* Let the shared library layer (e.g., solib-svr4) learn | |
660 | about this new process, relocate the cloned exec, pull in | |
661 | shared libraries, and install the solib event breakpoint. | |
662 | If a "cloned-VM" event was propagated better throughout | |
663 | the core, this wouldn't be required. */ | |
122373f7 SM |
664 | scoped_restore restore_in_initial_library_scan |
665 | = make_scoped_restore (&child_inf->in_initial_library_scan, true); | |
d83ad864 DB |
666 | solib_create_inferior_hook (0); |
667 | } | |
18493a00 PA |
668 | |
669 | switch_to_thread (child_thr); | |
d83ad864 DB |
670 | } |
671 | ||
e97007b6 SM |
672 | target_follow_fork (follow_child, detach_fork); |
673 | ||
674 | return false; | |
d83ad864 DB |
675 | } |
676 | ||
e58b0e63 PA |
677 | /* Tell the target to follow the fork we're stopped at. Returns true |
678 | if the inferior should be resumed; false, if the target for some | |
679 | reason decided it's best not to resume. */ | |
680 | ||
5ab2fbf1 SM |
681 | static bool |
682 | follow_fork () | |
c906108c | 683 | { |
5ab2fbf1 SM |
684 | bool follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
685 | bool should_resume = true; | |
e58b0e63 PA |
686 | struct thread_info *tp; |
687 | ||
688 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
689 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
690 | parent thread structure's run control related fields, not just these. |
691 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
692 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 693 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
694 | CORE_ADDR step_range_start = 0; |
695 | CORE_ADDR step_range_end = 0; | |
bf4cb9be TV |
696 | int current_line = 0; |
697 | symtab *current_symtab = NULL; | |
4e3990f4 | 698 | struct frame_id step_frame_id = { 0 }; |
8980e177 | 699 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
700 | |
701 | if (!non_stop) | |
702 | { | |
5b6d1e4f | 703 | process_stratum_target *wait_target; |
e58b0e63 PA |
704 | ptid_t wait_ptid; |
705 | struct target_waitstatus wait_status; | |
706 | ||
707 | /* Get the last target status returned by target_wait(). */ | |
5b6d1e4f | 708 | get_last_target_status (&wait_target, &wait_ptid, &wait_status); |
e58b0e63 PA |
709 | |
710 | /* If not stopped at a fork event, then there's nothing else to | |
711 | do. */ | |
712 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
713 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
714 | return 1; | |
715 | ||
716 | /* Check if we switched over from WAIT_PTID, since the event was | |
717 | reported. */ | |
00431a78 | 718 | if (wait_ptid != minus_one_ptid |
5b6d1e4f PA |
719 | && (current_inferior ()->process_target () != wait_target |
720 | || inferior_ptid != wait_ptid)) | |
e58b0e63 PA |
721 | { |
722 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
723 | target to follow it (in either direction). We'll | |
724 | afterwards refuse to resume, and inform the user what | |
725 | happened. */ | |
5b6d1e4f | 726 | thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid); |
00431a78 | 727 | switch_to_thread (wait_thread); |
5ab2fbf1 | 728 | should_resume = false; |
e58b0e63 PA |
729 | } |
730 | } | |
731 | ||
732 | tp = inferior_thread (); | |
733 | ||
734 | /* If there were any forks/vforks that were caught and are now to be | |
735 | followed, then do so now. */ | |
736 | switch (tp->pending_follow.kind) | |
737 | { | |
738 | case TARGET_WAITKIND_FORKED: | |
739 | case TARGET_WAITKIND_VFORKED: | |
740 | { | |
741 | ptid_t parent, child; | |
742 | ||
743 | /* If the user did a next/step, etc, over a fork call, | |
744 | preserve the stepping state in the fork child. */ | |
745 | if (follow_child && should_resume) | |
746 | { | |
8358c15c JK |
747 | step_resume_breakpoint = clone_momentary_breakpoint |
748 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
749 | step_range_start = tp->control.step_range_start; |
750 | step_range_end = tp->control.step_range_end; | |
bf4cb9be TV |
751 | current_line = tp->current_line; |
752 | current_symtab = tp->current_symtab; | |
16c381f0 | 753 | step_frame_id = tp->control.step_frame_id; |
186c406b TT |
754 | exception_resume_breakpoint |
755 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 756 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
757 | |
758 | /* For now, delete the parent's sr breakpoint, otherwise, | |
759 | parent/child sr breakpoints are considered duplicates, | |
760 | and the child version will not be installed. Remove | |
761 | this when the breakpoints module becomes aware of | |
762 | inferiors and address spaces. */ | |
763 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
764 | tp->control.step_range_start = 0; |
765 | tp->control.step_range_end = 0; | |
766 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 767 | delete_exception_resume_breakpoint (tp); |
8980e177 | 768 | tp->thread_fsm = NULL; |
e58b0e63 PA |
769 | } |
770 | ||
771 | parent = inferior_ptid; | |
772 | child = tp->pending_follow.value.related_pid; | |
773 | ||
8cc8b4da SM |
774 | /* If handling a vfork, stop all the inferior's threads, they will be |
775 | restarted when the vfork shared region is complete. */ | |
776 | if (tp->pending_follow.kind == TARGET_WAITKIND_VFORKED | |
777 | && target_is_non_stop_p ()) | |
778 | stop_all_threads ("handling vfork", tp->inf); | |
779 | ||
5b6d1e4f | 780 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
781 | /* Set up inferior(s) as specified by the caller, and tell the |
782 | target to do whatever is necessary to follow either parent | |
783 | or child. */ | |
784 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
785 | { |
786 | /* Target refused to follow, or there's some other reason | |
787 | we shouldn't resume. */ | |
788 | should_resume = 0; | |
789 | } | |
790 | else | |
791 | { | |
792 | /* This pending follow fork event is now handled, one way | |
793 | or another. The previous selected thread may be gone | |
794 | from the lists by now, but if it is still around, need | |
795 | to clear the pending follow request. */ | |
5b6d1e4f | 796 | tp = find_thread_ptid (parent_targ, parent); |
e58b0e63 PA |
797 | if (tp) |
798 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
799 | ||
800 | /* This makes sure we don't try to apply the "Switched | |
801 | over from WAIT_PID" logic above. */ | |
802 | nullify_last_target_wait_ptid (); | |
803 | ||
1777feb0 | 804 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
805 | if (follow_child) |
806 | { | |
5b6d1e4f | 807 | thread_info *child_thr = find_thread_ptid (parent_targ, child); |
00431a78 | 808 | switch_to_thread (child_thr); |
e58b0e63 PA |
809 | |
810 | /* ... and preserve the stepping state, in case the | |
811 | user was stepping over the fork call. */ | |
812 | if (should_resume) | |
813 | { | |
814 | tp = inferior_thread (); | |
8358c15c JK |
815 | tp->control.step_resume_breakpoint |
816 | = step_resume_breakpoint; | |
16c381f0 JK |
817 | tp->control.step_range_start = step_range_start; |
818 | tp->control.step_range_end = step_range_end; | |
bf4cb9be TV |
819 | tp->current_line = current_line; |
820 | tp->current_symtab = current_symtab; | |
16c381f0 | 821 | tp->control.step_frame_id = step_frame_id; |
186c406b TT |
822 | tp->control.exception_resume_breakpoint |
823 | = exception_resume_breakpoint; | |
8980e177 | 824 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
825 | } |
826 | else | |
827 | { | |
828 | /* If we get here, it was because we're trying to | |
829 | resume from a fork catchpoint, but, the user | |
830 | has switched threads away from the thread that | |
831 | forked. In that case, the resume command | |
832 | issued is most likely not applicable to the | |
833 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 834 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 835 | "before following fork child.")); |
e58b0e63 PA |
836 | } |
837 | ||
838 | /* Reset breakpoints in the child as appropriate. */ | |
839 | follow_inferior_reset_breakpoints (); | |
840 | } | |
e58b0e63 PA |
841 | } |
842 | } | |
843 | break; | |
844 | case TARGET_WAITKIND_SPURIOUS: | |
845 | /* Nothing to follow. */ | |
846 | break; | |
847 | default: | |
848 | internal_error (__FILE__, __LINE__, | |
849 | "Unexpected pending_follow.kind %d\n", | |
850 | tp->pending_follow.kind); | |
851 | break; | |
852 | } | |
c906108c | 853 | |
e58b0e63 | 854 | return should_resume; |
c906108c SS |
855 | } |
856 | ||
d83ad864 | 857 | static void |
6604731b | 858 | follow_inferior_reset_breakpoints (void) |
c906108c | 859 | { |
4e1c45ea PA |
860 | struct thread_info *tp = inferior_thread (); |
861 | ||
6604731b DJ |
862 | /* Was there a step_resume breakpoint? (There was if the user |
863 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
864 | thread number. Cloned step_resume breakpoints are disabled on |
865 | creation, so enable it here now that it is associated with the | |
866 | correct thread. | |
6604731b DJ |
867 | |
868 | step_resumes are a form of bp that are made to be per-thread. | |
869 | Since we created the step_resume bp when the parent process | |
870 | was being debugged, and now are switching to the child process, | |
871 | from the breakpoint package's viewpoint, that's a switch of | |
872 | "threads". We must update the bp's notion of which thread | |
873 | it is for, or it'll be ignored when it triggers. */ | |
874 | ||
8358c15c | 875 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
876 | { |
877 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
878 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
879 | } | |
6604731b | 880 | |
a1aa2221 | 881 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 882 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
883 | { |
884 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
885 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
886 | } | |
186c406b | 887 | |
6604731b DJ |
888 | /* Reinsert all breakpoints in the child. The user may have set |
889 | breakpoints after catching the fork, in which case those | |
890 | were never set in the child, but only in the parent. This makes | |
891 | sure the inserted breakpoints match the breakpoint list. */ | |
892 | ||
893 | breakpoint_re_set (); | |
894 | insert_breakpoints (); | |
c906108c | 895 | } |
c906108c | 896 | |
6c95b8df PA |
897 | /* The child has exited or execed: resume threads of the parent the |
898 | user wanted to be executing. */ | |
899 | ||
900 | static int | |
901 | proceed_after_vfork_done (struct thread_info *thread, | |
902 | void *arg) | |
903 | { | |
904 | int pid = * (int *) arg; | |
905 | ||
00431a78 PA |
906 | if (thread->ptid.pid () == pid |
907 | && thread->state == THREAD_RUNNING | |
908 | && !thread->executing | |
6c95b8df | 909 | && !thread->stop_requested |
a493e3e2 | 910 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df | 911 | { |
1eb8556f SM |
912 | infrun_debug_printf ("resuming vfork parent thread %s", |
913 | target_pid_to_str (thread->ptid).c_str ()); | |
6c95b8df | 914 | |
00431a78 | 915 | switch_to_thread (thread); |
70509625 | 916 | clear_proceed_status (0); |
64ce06e4 | 917 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
918 | } |
919 | ||
920 | return 0; | |
921 | } | |
922 | ||
923 | /* Called whenever we notice an exec or exit event, to handle | |
924 | detaching or resuming a vfork parent. */ | |
925 | ||
926 | static void | |
927 | handle_vfork_child_exec_or_exit (int exec) | |
928 | { | |
929 | struct inferior *inf = current_inferior (); | |
930 | ||
931 | if (inf->vfork_parent) | |
932 | { | |
933 | int resume_parent = -1; | |
934 | ||
935 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
936 | between the parent and the child. Break the bonds. */ |
937 | inferior *vfork_parent = inf->vfork_parent; | |
938 | inf->vfork_parent->vfork_child = NULL; | |
939 | inf->vfork_parent = NULL; | |
6c95b8df | 940 | |
b73715df TV |
941 | /* If the user wanted to detach from the parent, now is the |
942 | time. */ | |
943 | if (vfork_parent->pending_detach) | |
6c95b8df | 944 | { |
6c95b8df PA |
945 | struct program_space *pspace; |
946 | struct address_space *aspace; | |
947 | ||
1777feb0 | 948 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 949 | |
b73715df | 950 | vfork_parent->pending_detach = 0; |
68c9da30 | 951 | |
18493a00 | 952 | scoped_restore_current_pspace_and_thread restore_thread; |
6c95b8df PA |
953 | |
954 | /* We're letting loose of the parent. */ | |
18493a00 | 955 | thread_info *tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 956 | switch_to_thread (tp); |
6c95b8df PA |
957 | |
958 | /* We're about to detach from the parent, which implicitly | |
959 | removes breakpoints from its address space. There's a | |
960 | catch here: we want to reuse the spaces for the child, | |
961 | but, parent/child are still sharing the pspace at this | |
962 | point, although the exec in reality makes the kernel give | |
963 | the child a fresh set of new pages. The problem here is | |
964 | that the breakpoints module being unaware of this, would | |
965 | likely chose the child process to write to the parent | |
966 | address space. Swapping the child temporarily away from | |
967 | the spaces has the desired effect. Yes, this is "sort | |
968 | of" a hack. */ | |
969 | ||
970 | pspace = inf->pspace; | |
971 | aspace = inf->aspace; | |
972 | inf->aspace = NULL; | |
973 | inf->pspace = NULL; | |
974 | ||
f67c0c91 | 975 | if (print_inferior_events) |
6c95b8df | 976 | { |
a068643d | 977 | std::string pidstr |
b73715df | 978 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 979 | |
223ffa71 | 980 | target_terminal::ours_for_output (); |
6c95b8df PA |
981 | |
982 | if (exec) | |
6f259a23 DB |
983 | { |
984 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 985 | _("[Detaching vfork parent %s " |
a068643d | 986 | "after child exec]\n"), pidstr.c_str ()); |
6f259a23 | 987 | } |
6c95b8df | 988 | else |
6f259a23 DB |
989 | { |
990 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 991 | _("[Detaching vfork parent %s " |
a068643d | 992 | "after child exit]\n"), pidstr.c_str ()); |
6f259a23 | 993 | } |
6c95b8df PA |
994 | } |
995 | ||
b73715df | 996 | target_detach (vfork_parent, 0); |
6c95b8df PA |
997 | |
998 | /* Put it back. */ | |
999 | inf->pspace = pspace; | |
1000 | inf->aspace = aspace; | |
6c95b8df PA |
1001 | } |
1002 | else if (exec) | |
1003 | { | |
1004 | /* We're staying attached to the parent, so, really give the | |
1005 | child a new address space. */ | |
564b1e3f | 1006 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
1007 | inf->aspace = inf->pspace->aspace; |
1008 | inf->removable = 1; | |
1009 | set_current_program_space (inf->pspace); | |
1010 | ||
b73715df | 1011 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1012 | } |
1013 | else | |
1014 | { | |
6c95b8df PA |
1015 | /* If this is a vfork child exiting, then the pspace and |
1016 | aspaces were shared with the parent. Since we're | |
1017 | reporting the process exit, we'll be mourning all that is | |
1018 | found in the address space, and switching to null_ptid, | |
1019 | preparing to start a new inferior. But, since we don't | |
1020 | want to clobber the parent's address/program spaces, we | |
1021 | go ahead and create a new one for this exiting | |
1022 | inferior. */ | |
1023 | ||
18493a00 | 1024 | /* Switch to no-thread while running clone_program_space, so |
5ed8105e PA |
1025 | that clone_program_space doesn't want to read the |
1026 | selected frame of a dead process. */ | |
18493a00 PA |
1027 | scoped_restore_current_thread restore_thread; |
1028 | switch_to_no_thread (); | |
6c95b8df | 1029 | |
53af73bf PA |
1030 | inf->pspace = new program_space (maybe_new_address_space ()); |
1031 | inf->aspace = inf->pspace->aspace; | |
1032 | set_current_program_space (inf->pspace); | |
6c95b8df | 1033 | inf->removable = 1; |
7dcd53a0 | 1034 | inf->symfile_flags = SYMFILE_NO_READ; |
53af73bf | 1035 | clone_program_space (inf->pspace, vfork_parent->pspace); |
6c95b8df | 1036 | |
b73715df | 1037 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1038 | } |
1039 | ||
6c95b8df PA |
1040 | gdb_assert (current_program_space == inf->pspace); |
1041 | ||
1042 | if (non_stop && resume_parent != -1) | |
1043 | { | |
1044 | /* If the user wanted the parent to be running, let it go | |
1045 | free now. */ | |
5ed8105e | 1046 | scoped_restore_current_thread restore_thread; |
6c95b8df | 1047 | |
1eb8556f SM |
1048 | infrun_debug_printf ("resuming vfork parent process %d", |
1049 | resume_parent); | |
6c95b8df PA |
1050 | |
1051 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1052 | } |
1053 | } | |
1054 | } | |
1055 | ||
8cc8b4da SM |
1056 | /* Handle TARGET_WAITKIND_VFORK_DONE. */ |
1057 | ||
1058 | static void | |
1059 | handle_vfork_done (thread_info *event_thread) | |
1060 | { | |
1061 | /* We only care about this event if inferior::thread_waiting_for_vfork_done is | |
1062 | set, that is if we are waiting for a vfork child not under our control | |
1063 | (because we detached it) to exec or exit. | |
1064 | ||
1065 | If an inferior has vforked and we are debugging the child, we don't use | |
1066 | the vfork-done event to get notified about the end of the shared address | |
1067 | space window). We rely instead on the child's exec or exit event, and the | |
1068 | inferior::vfork_{parent,child} fields are used instead. See | |
1069 | handle_vfork_child_exec_or_exit for that. */ | |
1070 | if (event_thread->inf->thread_waiting_for_vfork_done == nullptr) | |
1071 | { | |
1072 | infrun_debug_printf ("not waiting for a vfork-done event"); | |
1073 | return; | |
1074 | } | |
1075 | ||
1076 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; | |
1077 | ||
1078 | /* We stopped all threads (other than the vforking thread) of the inferior in | |
1079 | follow_fork and kept them stopped until now. It should therefore not be | |
1080 | possible for another thread to have reported a vfork during that window. | |
1081 | If THREAD_WAITING_FOR_VFORK_DONE is set, it has to be the same thread whose | |
1082 | vfork-done we are handling right now. */ | |
1083 | gdb_assert (event_thread->inf->thread_waiting_for_vfork_done == event_thread); | |
1084 | ||
1085 | event_thread->inf->thread_waiting_for_vfork_done = nullptr; | |
1086 | event_thread->inf->pspace->breakpoints_not_allowed = 0; | |
1087 | ||
1088 | /* On non-stop targets, we stopped all the inferior's threads in follow_fork, | |
1089 | resume them now. On all-stop targets, everything that needs to be resumed | |
1090 | will be when we resume the event thread. */ | |
1091 | if (target_is_non_stop_p ()) | |
1092 | { | |
1093 | /* restart_threads and start_step_over may change the current thread, make | |
1094 | sure we leave the event thread as the current thread. */ | |
1095 | scoped_restore_current_thread restore_thread; | |
1096 | ||
1097 | insert_breakpoints (); | |
1098 | restart_threads (event_thread, event_thread->inf); | |
1099 | start_step_over (); | |
1100 | } | |
1101 | } | |
1102 | ||
eb6c553b | 1103 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1104 | |
1105 | static const char follow_exec_mode_new[] = "new"; | |
1106 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1107 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1108 | { |
1109 | follow_exec_mode_new, | |
1110 | follow_exec_mode_same, | |
1111 | NULL, | |
1112 | }; | |
1113 | ||
1114 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1115 | static void | |
1116 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1117 | struct cmd_list_element *c, const char *value) | |
1118 | { | |
1119 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1120 | } | |
1121 | ||
ecf45d2c | 1122 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1123 | |
c906108c | 1124 | static void |
4ca51187 | 1125 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1126 | { |
e99b03dc | 1127 | int pid = ptid.pid (); |
94585166 | 1128 | ptid_t process_ptid; |
7a292a7a | 1129 | |
65d2b333 PW |
1130 | /* Switch terminal for any messages produced e.g. by |
1131 | breakpoint_re_set. */ | |
1132 | target_terminal::ours_for_output (); | |
1133 | ||
c906108c SS |
1134 | /* This is an exec event that we actually wish to pay attention to. |
1135 | Refresh our symbol table to the newly exec'd program, remove any | |
1136 | momentary bp's, etc. | |
1137 | ||
1138 | If there are breakpoints, they aren't really inserted now, | |
1139 | since the exec() transformed our inferior into a fresh set | |
1140 | of instructions. | |
1141 | ||
1142 | We want to preserve symbolic breakpoints on the list, since | |
1143 | we have hopes that they can be reset after the new a.out's | |
1144 | symbol table is read. | |
1145 | ||
1146 | However, any "raw" breakpoints must be removed from the list | |
1147 | (e.g., the solib bp's), since their address is probably invalid | |
1148 | now. | |
1149 | ||
1150 | And, we DON'T want to call delete_breakpoints() here, since | |
1151 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1152 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1153 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1154 | |
1155 | mark_breakpoints_out (); | |
1156 | ||
95e50b27 PA |
1157 | /* The target reports the exec event to the main thread, even if |
1158 | some other thread does the exec, and even if the main thread was | |
1159 | stopped or already gone. We may still have non-leader threads of | |
1160 | the process on our list. E.g., on targets that don't have thread | |
1161 | exit events (like remote); or on native Linux in non-stop mode if | |
1162 | there were only two threads in the inferior and the non-leader | |
1163 | one is the one that execs (and nothing forces an update of the | |
1164 | thread list up to here). When debugging remotely, it's best to | |
1165 | avoid extra traffic, when possible, so avoid syncing the thread | |
1166 | list with the target, and instead go ahead and delete all threads | |
1167 | of the process but one that reported the event. Note this must | |
1168 | be done before calling update_breakpoints_after_exec, as | |
1169 | otherwise clearing the threads' resources would reference stale | |
1170 | thread breakpoints -- it may have been one of these threads that | |
1171 | stepped across the exec. We could just clear their stepping | |
1172 | states, but as long as we're iterating, might as well delete | |
1173 | them. Deleting them now rather than at the next user-visible | |
1174 | stop provides a nicer sequence of events for user and MI | |
1175 | notifications. */ | |
08036331 | 1176 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1177 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1178 | delete_thread (th); |
95e50b27 PA |
1179 | |
1180 | /* We also need to clear any left over stale state for the | |
1181 | leader/event thread. E.g., if there was any step-resume | |
1182 | breakpoint or similar, it's gone now. We cannot truly | |
1183 | step-to-next statement through an exec(). */ | |
08036331 | 1184 | thread_info *th = inferior_thread (); |
8358c15c | 1185 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1186 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1187 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1188 | th->control.step_range_start = 0; |
1189 | th->control.step_range_end = 0; | |
c906108c | 1190 | |
95e50b27 PA |
1191 | /* The user may have had the main thread held stopped in the |
1192 | previous image (e.g., schedlock on, or non-stop). Release | |
1193 | it now. */ | |
a75724bc PA |
1194 | th->stop_requested = 0; |
1195 | ||
95e50b27 PA |
1196 | update_breakpoints_after_exec (); |
1197 | ||
1777feb0 | 1198 | /* What is this a.out's name? */ |
f2907e49 | 1199 | process_ptid = ptid_t (pid); |
6c95b8df | 1200 | printf_unfiltered (_("%s is executing new program: %s\n"), |
a068643d | 1201 | target_pid_to_str (process_ptid).c_str (), |
ecf45d2c | 1202 | exec_file_target); |
c906108c SS |
1203 | |
1204 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1205 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1206 | |
6ca15a4b | 1207 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1208 | |
797bc1cb TT |
1209 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1210 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1211 | |
ecf45d2c SL |
1212 | /* If we were unable to map the executable target pathname onto a host |
1213 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1214 | is confusing. Maybe it would even be better to stop at this point | |
1215 | so that the user can specify a file manually before continuing. */ | |
1216 | if (exec_file_host == NULL) | |
1217 | warning (_("Could not load symbols for executable %s.\n" | |
1218 | "Do you need \"set sysroot\"?"), | |
1219 | exec_file_target); | |
c906108c | 1220 | |
cce9b6bf PA |
1221 | /* Reset the shared library package. This ensures that we get a |
1222 | shlib event when the child reaches "_start", at which point the | |
1223 | dld will have had a chance to initialize the child. */ | |
1224 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1225 | we don't want those to be satisfied by the libraries of the | |
1226 | previous incarnation of this process. */ | |
1227 | no_shared_libraries (NULL, 0); | |
1228 | ||
294c36eb SM |
1229 | struct inferior *inf = current_inferior (); |
1230 | ||
6c95b8df PA |
1231 | if (follow_exec_mode_string == follow_exec_mode_new) |
1232 | { | |
6c95b8df PA |
1233 | /* The user wants to keep the old inferior and program spaces |
1234 | around. Create a new fresh one, and switch to it. */ | |
1235 | ||
35ed81d4 SM |
1236 | /* Do exit processing for the original inferior before setting the new |
1237 | inferior's pid. Having two inferiors with the same pid would confuse | |
1238 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1239 | old to the new inferior. */ | |
294c36eb SM |
1240 | inferior *new_inferior = add_inferior_with_spaces (); |
1241 | ||
1242 | swap_terminal_info (new_inferior, inf); | |
1243 | exit_inferior_silent (inf); | |
1244 | ||
1245 | new_inferior->pid = pid; | |
1246 | target_follow_exec (new_inferior, ptid, exec_file_target); | |
1247 | ||
1248 | /* We continue with the new inferior. */ | |
1249 | inf = new_inferior; | |
6c95b8df | 1250 | } |
9107fc8d PA |
1251 | else |
1252 | { | |
1253 | /* The old description may no longer be fit for the new image. | |
1254 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1255 | old description; we'll read a new one below. No need to do | |
1256 | this on "follow-exec-mode new", as the old inferior stays | |
1257 | around (its description is later cleared/refetched on | |
1258 | restart). */ | |
1259 | target_clear_description (); | |
294c36eb | 1260 | target_follow_exec (inf, ptid, exec_file_target); |
9107fc8d | 1261 | } |
6c95b8df | 1262 | |
294c36eb | 1263 | gdb_assert (current_inferior () == inf); |
6c95b8df PA |
1264 | gdb_assert (current_program_space == inf->pspace); |
1265 | ||
ecf45d2c SL |
1266 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1267 | because the proper displacement for a PIE (Position Independent | |
1268 | Executable) main symbol file will only be computed by | |
1269 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1270 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1271 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1272 | |
9107fc8d PA |
1273 | /* If the target can specify a description, read it. Must do this |
1274 | after flipping to the new executable (because the target supplied | |
1275 | description must be compatible with the executable's | |
1276 | architecture, and the old executable may e.g., be 32-bit, while | |
1277 | the new one 64-bit), and before anything involving memory or | |
1278 | registers. */ | |
1279 | target_find_description (); | |
1280 | ||
42a4fec5 | 1281 | gdb::observers::inferior_execd.notify (inf); |
4efc6507 | 1282 | |
c1e56572 JK |
1283 | breakpoint_re_set (); |
1284 | ||
c906108c SS |
1285 | /* Reinsert all breakpoints. (Those which were symbolic have |
1286 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1287 | to symbol_file_command...). */ |
c906108c SS |
1288 | insert_breakpoints (); |
1289 | ||
1290 | /* The next resume of this inferior should bring it to the shlib | |
1291 | startup breakpoints. (If the user had also set bp's on | |
1292 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1293 | matically get reset there in the new process.). */ |
c906108c SS |
1294 | } |
1295 | ||
28d5518b | 1296 | /* The chain of threads that need to do a step-over operation to get |
c2829269 PA |
1297 | past e.g., a breakpoint. What technique is used to step over the |
1298 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1299 | same queue, to maintain rough temporal order of execution, in order | |
1300 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1301 | constantly stepping the same couple threads past their breakpoints | |
1302 | over and over, if the single-step finish fast enough. */ | |
28d5518b | 1303 | struct thread_info *global_thread_step_over_chain_head; |
c2829269 | 1304 | |
6c4cfb24 PA |
1305 | /* Bit flags indicating what the thread needs to step over. */ |
1306 | ||
8d297bbf | 1307 | enum step_over_what_flag |
6c4cfb24 PA |
1308 | { |
1309 | /* Step over a breakpoint. */ | |
1310 | STEP_OVER_BREAKPOINT = 1, | |
1311 | ||
1312 | /* Step past a non-continuable watchpoint, in order to let the | |
1313 | instruction execute so we can evaluate the watchpoint | |
1314 | expression. */ | |
1315 | STEP_OVER_WATCHPOINT = 2 | |
1316 | }; | |
8d297bbf | 1317 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1318 | |
963f9c80 | 1319 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1320 | |
1321 | struct step_over_info | |
1322 | { | |
963f9c80 PA |
1323 | /* If we're stepping past a breakpoint, this is the address space |
1324 | and address of the instruction the breakpoint is set at. We'll | |
1325 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1326 | non-NULL. */ | |
ac7d717c PA |
1327 | const address_space *aspace = nullptr; |
1328 | CORE_ADDR address = 0; | |
963f9c80 PA |
1329 | |
1330 | /* The instruction being stepped over triggers a nonsteppable | |
1331 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
ac7d717c | 1332 | int nonsteppable_watchpoint_p = 0; |
21edc42f YQ |
1333 | |
1334 | /* The thread's global number. */ | |
ac7d717c | 1335 | int thread = -1; |
31e77af2 PA |
1336 | }; |
1337 | ||
1338 | /* The step-over info of the location that is being stepped over. | |
1339 | ||
1340 | Note that with async/breakpoint always-inserted mode, a user might | |
1341 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1342 | being stepped over. As setting a new breakpoint inserts all | |
1343 | breakpoints, we need to make sure the breakpoint being stepped over | |
1344 | isn't inserted then. We do that by only clearing the step-over | |
1345 | info when the step-over is actually finished (or aborted). | |
1346 | ||
1347 | Presently GDB can only step over one breakpoint at any given time. | |
1348 | Given threads that can't run code in the same address space as the | |
1349 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1350 | to step-over at most one breakpoint per address space (so this info | |
1351 | could move to the address space object if/when GDB is extended). | |
1352 | The set of breakpoints being stepped over will normally be much | |
1353 | smaller than the set of all breakpoints, so a flag in the | |
1354 | breakpoint location structure would be wasteful. A separate list | |
1355 | also saves complexity and run-time, as otherwise we'd have to go | |
1356 | through all breakpoint locations clearing their flag whenever we | |
1357 | start a new sequence. Similar considerations weigh against storing | |
1358 | this info in the thread object. Plus, not all step overs actually | |
1359 | have breakpoint locations -- e.g., stepping past a single-step | |
1360 | breakpoint, or stepping to complete a non-continuable | |
1361 | watchpoint. */ | |
1362 | static struct step_over_info step_over_info; | |
1363 | ||
1364 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1365 | stepping over. |
1366 | N.B. We record the aspace and address now, instead of say just the thread, | |
1367 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1368 | |
1369 | static void | |
8b86c959 | 1370 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1371 | int nonsteppable_watchpoint_p, |
1372 | int thread) | |
31e77af2 PA |
1373 | { |
1374 | step_over_info.aspace = aspace; | |
1375 | step_over_info.address = address; | |
963f9c80 | 1376 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1377 | step_over_info.thread = thread; |
31e77af2 PA |
1378 | } |
1379 | ||
1380 | /* Called when we're not longer stepping over a breakpoint / an | |
1381 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1382 | ||
1383 | static void | |
1384 | clear_step_over_info (void) | |
1385 | { | |
1eb8556f | 1386 | infrun_debug_printf ("clearing step over info"); |
31e77af2 PA |
1387 | step_over_info.aspace = NULL; |
1388 | step_over_info.address = 0; | |
963f9c80 | 1389 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1390 | step_over_info.thread = -1; |
31e77af2 PA |
1391 | } |
1392 | ||
7f89fd65 | 1393 | /* See infrun.h. */ |
31e77af2 PA |
1394 | |
1395 | int | |
1396 | stepping_past_instruction_at (struct address_space *aspace, | |
1397 | CORE_ADDR address) | |
1398 | { | |
1399 | return (step_over_info.aspace != NULL | |
1400 | && breakpoint_address_match (aspace, address, | |
1401 | step_over_info.aspace, | |
1402 | step_over_info.address)); | |
1403 | } | |
1404 | ||
963f9c80 PA |
1405 | /* See infrun.h. */ |
1406 | ||
21edc42f YQ |
1407 | int |
1408 | thread_is_stepping_over_breakpoint (int thread) | |
1409 | { | |
1410 | return (step_over_info.thread != -1 | |
1411 | && thread == step_over_info.thread); | |
1412 | } | |
1413 | ||
1414 | /* See infrun.h. */ | |
1415 | ||
963f9c80 PA |
1416 | int |
1417 | stepping_past_nonsteppable_watchpoint (void) | |
1418 | { | |
1419 | return step_over_info.nonsteppable_watchpoint_p; | |
1420 | } | |
1421 | ||
6cc83d2a PA |
1422 | /* Returns true if step-over info is valid. */ |
1423 | ||
c4464ade | 1424 | static bool |
6cc83d2a PA |
1425 | step_over_info_valid_p (void) |
1426 | { | |
963f9c80 PA |
1427 | return (step_over_info.aspace != NULL |
1428 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1429 | } |
1430 | ||
c906108c | 1431 | \f |
237fc4c9 PA |
1432 | /* Displaced stepping. */ |
1433 | ||
1434 | /* In non-stop debugging mode, we must take special care to manage | |
1435 | breakpoints properly; in particular, the traditional strategy for | |
1436 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1437 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1438 | breakpoint it has hit while ensuring that other threads running | |
1439 | concurrently will hit the breakpoint as they should. | |
1440 | ||
1441 | The traditional way to step a thread T off a breakpoint in a | |
1442 | multi-threaded program in all-stop mode is as follows: | |
1443 | ||
1444 | a0) Initially, all threads are stopped, and breakpoints are not | |
1445 | inserted. | |
1446 | a1) We single-step T, leaving breakpoints uninserted. | |
1447 | a2) We insert breakpoints, and resume all threads. | |
1448 | ||
1449 | In non-stop debugging, however, this strategy is unsuitable: we | |
1450 | don't want to have to stop all threads in the system in order to | |
1451 | continue or step T past a breakpoint. Instead, we use displaced | |
1452 | stepping: | |
1453 | ||
1454 | n0) Initially, T is stopped, other threads are running, and | |
1455 | breakpoints are inserted. | |
1456 | n1) We copy the instruction "under" the breakpoint to a separate | |
1457 | location, outside the main code stream, making any adjustments | |
1458 | to the instruction, register, and memory state as directed by | |
1459 | T's architecture. | |
1460 | n2) We single-step T over the instruction at its new location. | |
1461 | n3) We adjust the resulting register and memory state as directed | |
1462 | by T's architecture. This includes resetting T's PC to point | |
1463 | back into the main instruction stream. | |
1464 | n4) We resume T. | |
1465 | ||
1466 | This approach depends on the following gdbarch methods: | |
1467 | ||
1468 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1469 | indicate where to copy the instruction, and how much space must | |
1470 | be reserved there. We use these in step n1. | |
1471 | ||
1472 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1473 | address, and makes any necessary adjustments to the instruction, | |
1474 | register contents, and memory. We use this in step n1. | |
1475 | ||
1476 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1477 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1478 | same effect the instruction would have had if we had executed it |
1479 | at its original address. We use this in step n3. | |
1480 | ||
237fc4c9 PA |
1481 | The gdbarch_displaced_step_copy_insn and |
1482 | gdbarch_displaced_step_fixup functions must be written so that | |
1483 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1484 | single-stepping across the copied instruction, and then applying | |
1485 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1486 | thread's memory and registers as stepping the instruction in place | |
1487 | would have. Exactly which responsibilities fall to the copy and | |
1488 | which fall to the fixup is up to the author of those functions. | |
1489 | ||
1490 | See the comments in gdbarch.sh for details. | |
1491 | ||
1492 | Note that displaced stepping and software single-step cannot | |
1493 | currently be used in combination, although with some care I think | |
1494 | they could be made to. Software single-step works by placing | |
1495 | breakpoints on all possible subsequent instructions; if the | |
1496 | displaced instruction is a PC-relative jump, those breakpoints | |
1497 | could fall in very strange places --- on pages that aren't | |
1498 | executable, or at addresses that are not proper instruction | |
1499 | boundaries. (We do generally let other threads run while we wait | |
1500 | to hit the software single-step breakpoint, and they might | |
1501 | encounter such a corrupted instruction.) One way to work around | |
1502 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1503 | simulate the effect of PC-relative instructions (and return NULL) | |
1504 | on architectures that use software single-stepping. | |
1505 | ||
1506 | In non-stop mode, we can have independent and simultaneous step | |
1507 | requests, so more than one thread may need to simultaneously step | |
1508 | over a breakpoint. The current implementation assumes there is | |
1509 | only one scratch space per process. In this case, we have to | |
1510 | serialize access to the scratch space. If thread A wants to step | |
1511 | over a breakpoint, but we are currently waiting for some other | |
1512 | thread to complete a displaced step, we leave thread A stopped and | |
1513 | place it in the displaced_step_request_queue. Whenever a displaced | |
1514 | step finishes, we pick the next thread in the queue and start a new | |
1515 | displaced step operation on it. See displaced_step_prepare and | |
7def77a1 | 1516 | displaced_step_finish for details. */ |
237fc4c9 | 1517 | |
a46d1843 | 1518 | /* Return true if THREAD is doing a displaced step. */ |
c0987663 | 1519 | |
c4464ade | 1520 | static bool |
00431a78 | 1521 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1522 | { |
00431a78 | 1523 | gdb_assert (thread != NULL); |
c0987663 | 1524 | |
187b041e | 1525 | return thread->displaced_step_state.in_progress (); |
c0987663 YQ |
1526 | } |
1527 | ||
a46d1843 | 1528 | /* Return true if INF has a thread doing a displaced step. */ |
8f572e5c | 1529 | |
c4464ade | 1530 | static bool |
00431a78 | 1531 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1532 | { |
187b041e | 1533 | return inf->displaced_step_state.in_progress_count > 0; |
fc1cf338 PA |
1534 | } |
1535 | ||
187b041e | 1536 | /* Return true if any thread is doing a displaced step. */ |
a42244db | 1537 | |
187b041e SM |
1538 | static bool |
1539 | displaced_step_in_progress_any_thread () | |
a42244db | 1540 | { |
187b041e SM |
1541 | for (inferior *inf : all_non_exited_inferiors ()) |
1542 | { | |
1543 | if (displaced_step_in_progress (inf)) | |
1544 | return true; | |
1545 | } | |
a42244db | 1546 | |
187b041e | 1547 | return false; |
a42244db YQ |
1548 | } |
1549 | ||
fc1cf338 PA |
1550 | static void |
1551 | infrun_inferior_exit (struct inferior *inf) | |
1552 | { | |
d20172fc | 1553 | inf->displaced_step_state.reset (); |
e6e25d5a | 1554 | inf->thread_waiting_for_vfork_done = nullptr; |
fc1cf338 | 1555 | } |
237fc4c9 | 1556 | |
3b7a962d SM |
1557 | static void |
1558 | infrun_inferior_execd (inferior *inf) | |
1559 | { | |
187b041e SM |
1560 | /* If some threads where was doing a displaced step in this inferior at the |
1561 | moment of the exec, they no longer exist. Even if the exec'ing thread | |
3b7a962d SM |
1562 | doing a displaced step, we don't want to to any fixup nor restore displaced |
1563 | stepping buffer bytes. */ | |
1564 | inf->displaced_step_state.reset (); | |
1565 | ||
187b041e SM |
1566 | for (thread_info *thread : inf->threads ()) |
1567 | thread->displaced_step_state.reset (); | |
1568 | ||
3b7a962d SM |
1569 | /* Since an in-line step is done with everything else stopped, if there was |
1570 | one in progress at the time of the exec, it must have been the exec'ing | |
1571 | thread. */ | |
1572 | clear_step_over_info (); | |
e6e25d5a SM |
1573 | |
1574 | inf->thread_waiting_for_vfork_done = nullptr; | |
3b7a962d SM |
1575 | } |
1576 | ||
fff08868 HZ |
1577 | /* If ON, and the architecture supports it, GDB will use displaced |
1578 | stepping to step over breakpoints. If OFF, or if the architecture | |
1579 | doesn't support it, GDB will instead use the traditional | |
1580 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1581 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1582 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1583 | |
72d0e2c5 | 1584 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1585 | |
237fc4c9 PA |
1586 | static void |
1587 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1588 | struct cmd_list_element *c, | |
1589 | const char *value) | |
1590 | { | |
72d0e2c5 | 1591 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1592 | fprintf_filtered (file, |
1593 | _("Debugger's willingness to use displaced stepping " | |
1594 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1595 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1596 | else |
3e43a32a MS |
1597 | fprintf_filtered (file, |
1598 | _("Debugger's willingness to use displaced stepping " | |
1599 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1600 | } |
1601 | ||
9822cb57 SM |
1602 | /* Return true if the gdbarch implements the required methods to use |
1603 | displaced stepping. */ | |
1604 | ||
1605 | static bool | |
1606 | gdbarch_supports_displaced_stepping (gdbarch *arch) | |
1607 | { | |
187b041e SM |
1608 | /* Only check for the presence of `prepare`. The gdbarch verification ensures |
1609 | that if `prepare` is provided, so is `finish`. */ | |
1610 | return gdbarch_displaced_step_prepare_p (arch); | |
9822cb57 SM |
1611 | } |
1612 | ||
fff08868 | 1613 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1614 | over breakpoints of thread TP. */ |
fff08868 | 1615 | |
9822cb57 SM |
1616 | static bool |
1617 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1618 | { |
9822cb57 SM |
1619 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1620 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1621 | return false; | |
1622 | ||
1623 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1624 | way. */ | |
1625 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1626 | && !target_is_non_stop_p ()) | |
1627 | return false; | |
1628 | ||
1629 | gdbarch *gdbarch = get_thread_regcache (tp)->arch (); | |
1630 | ||
1631 | /* If the architecture doesn't implement displaced stepping, don't use | |
1632 | it. */ | |
1633 | if (!gdbarch_supports_displaced_stepping (gdbarch)) | |
1634 | return false; | |
1635 | ||
1636 | /* If recording, don't use displaced stepping. */ | |
1637 | if (find_record_target () != nullptr) | |
1638 | return false; | |
1639 | ||
9822cb57 SM |
1640 | /* If displaced stepping failed before for this inferior, don't bother trying |
1641 | again. */ | |
f5f01699 | 1642 | if (tp->inf->displaced_step_state.failed_before) |
9822cb57 SM |
1643 | return false; |
1644 | ||
1645 | return true; | |
237fc4c9 PA |
1646 | } |
1647 | ||
187b041e | 1648 | /* Simple function wrapper around displaced_step_thread_state::reset. */ |
d8d83535 | 1649 | |
237fc4c9 | 1650 | static void |
187b041e | 1651 | displaced_step_reset (displaced_step_thread_state *displaced) |
237fc4c9 | 1652 | { |
d8d83535 | 1653 | displaced->reset (); |
237fc4c9 PA |
1654 | } |
1655 | ||
d8d83535 SM |
1656 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1657 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1658 | ||
1659 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 | 1660 | |
136821d9 SM |
1661 | /* See infrun.h. */ |
1662 | ||
1663 | std::string | |
1664 | displaced_step_dump_bytes (const gdb_byte *buf, size_t len) | |
237fc4c9 | 1665 | { |
136821d9 | 1666 | std::string ret; |
237fc4c9 | 1667 | |
136821d9 SM |
1668 | for (size_t i = 0; i < len; i++) |
1669 | { | |
1670 | if (i == 0) | |
1671 | ret += string_printf ("%02x", buf[i]); | |
1672 | else | |
1673 | ret += string_printf (" %02x", buf[i]); | |
1674 | } | |
1675 | ||
1676 | return ret; | |
237fc4c9 PA |
1677 | } |
1678 | ||
1679 | /* Prepare to single-step, using displaced stepping. | |
1680 | ||
1681 | Note that we cannot use displaced stepping when we have a signal to | |
1682 | deliver. If we have a signal to deliver and an instruction to step | |
1683 | over, then after the step, there will be no indication from the | |
1684 | target whether the thread entered a signal handler or ignored the | |
1685 | signal and stepped over the instruction successfully --- both cases | |
1686 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1687 | fixup, and in the second case we must --- but we can't tell which. | |
1688 | Comments in the code for 'random signals' in handle_inferior_event | |
1689 | explain how we handle this case instead. | |
1690 | ||
bab37966 SM |
1691 | Returns DISPLACED_STEP_PREPARE_STATUS_OK if preparing was successful -- this |
1692 | thread is going to be stepped now; DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE | |
1693 | if displaced stepping this thread got queued; or | |
1694 | DISPLACED_STEP_PREPARE_STATUS_CANT if this instruction can't be displaced | |
1695 | stepped. */ | |
7f03bd92 | 1696 | |
bab37966 | 1697 | static displaced_step_prepare_status |
00431a78 | 1698 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1699 | { |
00431a78 | 1700 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1701 | struct gdbarch *gdbarch = regcache->arch (); |
187b041e SM |
1702 | displaced_step_thread_state &disp_step_thread_state |
1703 | = tp->displaced_step_state; | |
237fc4c9 PA |
1704 | |
1705 | /* We should never reach this function if the architecture does not | |
1706 | support displaced stepping. */ | |
9822cb57 | 1707 | gdb_assert (gdbarch_supports_displaced_stepping (gdbarch)); |
237fc4c9 | 1708 | |
c2829269 PA |
1709 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1710 | gdb_assert (tp->control.trap_expected); | |
1711 | ||
c1e36e3e PA |
1712 | /* Disable range stepping while executing in the scratch pad. We |
1713 | want a single-step even if executing the displaced instruction in | |
1714 | the scratch buffer lands within the stepping range (e.g., a | |
1715 | jump/branch). */ | |
1716 | tp->control.may_range_step = 0; | |
1717 | ||
187b041e SM |
1718 | /* We are about to start a displaced step for this thread. If one is already |
1719 | in progress, something's wrong. */ | |
1720 | gdb_assert (!disp_step_thread_state.in_progress ()); | |
237fc4c9 | 1721 | |
187b041e | 1722 | if (tp->inf->displaced_step_state.unavailable) |
237fc4c9 | 1723 | { |
187b041e SM |
1724 | /* The gdbarch tells us it's not worth asking to try a prepare because |
1725 | it is likely that it will return unavailable, so don't bother asking. */ | |
237fc4c9 | 1726 | |
136821d9 SM |
1727 | displaced_debug_printf ("deferring step of %s", |
1728 | target_pid_to_str (tp->ptid).c_str ()); | |
237fc4c9 | 1729 | |
28d5518b | 1730 | global_thread_step_over_chain_enqueue (tp); |
bab37966 | 1731 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; |
237fc4c9 | 1732 | } |
237fc4c9 | 1733 | |
187b041e SM |
1734 | displaced_debug_printf ("displaced-stepping %s now", |
1735 | target_pid_to_str (tp->ptid).c_str ()); | |
237fc4c9 | 1736 | |
00431a78 PA |
1737 | scoped_restore_current_thread restore_thread; |
1738 | ||
1739 | switch_to_thread (tp); | |
ad53cd71 | 1740 | |
187b041e SM |
1741 | CORE_ADDR original_pc = regcache_read_pc (regcache); |
1742 | CORE_ADDR displaced_pc; | |
237fc4c9 | 1743 | |
187b041e SM |
1744 | displaced_step_prepare_status status |
1745 | = gdbarch_displaced_step_prepare (gdbarch, tp, displaced_pc); | |
237fc4c9 | 1746 | |
187b041e | 1747 | if (status == DISPLACED_STEP_PREPARE_STATUS_CANT) |
d35ae833 | 1748 | { |
187b041e SM |
1749 | displaced_debug_printf ("failed to prepare (%s)", |
1750 | target_pid_to_str (tp->ptid).c_str ()); | |
d35ae833 | 1751 | |
bab37966 | 1752 | return DISPLACED_STEP_PREPARE_STATUS_CANT; |
d35ae833 | 1753 | } |
187b041e | 1754 | else if (status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
7f03bd92 | 1755 | { |
187b041e SM |
1756 | /* Not enough displaced stepping resources available, defer this |
1757 | request by placing it the queue. */ | |
1758 | ||
1759 | displaced_debug_printf ("not enough resources available, " | |
1760 | "deferring step of %s", | |
1761 | target_pid_to_str (tp->ptid).c_str ()); | |
1762 | ||
1763 | global_thread_step_over_chain_enqueue (tp); | |
1764 | ||
1765 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; | |
7f03bd92 | 1766 | } |
237fc4c9 | 1767 | |
187b041e SM |
1768 | gdb_assert (status == DISPLACED_STEP_PREPARE_STATUS_OK); |
1769 | ||
9f5a595d UW |
1770 | /* Save the information we need to fix things up if the step |
1771 | succeeds. */ | |
187b041e | 1772 | disp_step_thread_state.set (gdbarch); |
9f5a595d | 1773 | |
187b041e | 1774 | tp->inf->displaced_step_state.in_progress_count++; |
ad53cd71 | 1775 | |
187b041e SM |
1776 | displaced_debug_printf ("prepared successfully thread=%s, " |
1777 | "original_pc=%s, displaced_pc=%s", | |
1778 | target_pid_to_str (tp->ptid).c_str (), | |
1779 | paddress (gdbarch, original_pc), | |
1780 | paddress (gdbarch, displaced_pc)); | |
237fc4c9 | 1781 | |
bab37966 | 1782 | return DISPLACED_STEP_PREPARE_STATUS_OK; |
237fc4c9 PA |
1783 | } |
1784 | ||
3fc8eb30 PA |
1785 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1786 | attempts at displaced stepping if we get a memory error. */ | |
1787 | ||
bab37966 | 1788 | static displaced_step_prepare_status |
00431a78 | 1789 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 | 1790 | { |
bab37966 SM |
1791 | displaced_step_prepare_status status |
1792 | = DISPLACED_STEP_PREPARE_STATUS_CANT; | |
3fc8eb30 | 1793 | |
a70b8144 | 1794 | try |
3fc8eb30 | 1795 | { |
bab37966 | 1796 | status = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1797 | } |
230d2906 | 1798 | catch (const gdb_exception_error &ex) |
3fc8eb30 | 1799 | { |
16b41842 PA |
1800 | if (ex.error != MEMORY_ERROR |
1801 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1802 | throw; |
3fc8eb30 | 1803 | |
1eb8556f SM |
1804 | infrun_debug_printf ("caught exception, disabling displaced stepping: %s", |
1805 | ex.what ()); | |
3fc8eb30 PA |
1806 | |
1807 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1808 | "auto". */ | |
1809 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1810 | { | |
fd7dcb94 | 1811 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1812 | ex.what ()); |
3fc8eb30 PA |
1813 | } |
1814 | ||
1815 | /* Disable further displaced stepping attempts. */ | |
f5f01699 | 1816 | thread->inf->displaced_step_state.failed_before = 1; |
3fc8eb30 | 1817 | } |
3fc8eb30 | 1818 | |
bab37966 | 1819 | return status; |
3fc8eb30 PA |
1820 | } |
1821 | ||
bab37966 SM |
1822 | /* If we displaced stepped an instruction successfully, adjust registers and |
1823 | memory to yield the same effect the instruction would have had if we had | |
1824 | executed it at its original address, and return | |
1825 | DISPLACED_STEP_FINISH_STATUS_OK. If the instruction didn't complete, | |
1826 | relocate the PC and return DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED. | |
372316f1 | 1827 | |
bab37966 SM |
1828 | If the thread wasn't displaced stepping, return |
1829 | DISPLACED_STEP_FINISH_STATUS_OK as well. */ | |
1830 | ||
1831 | static displaced_step_finish_status | |
7def77a1 | 1832 | displaced_step_finish (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1833 | { |
187b041e | 1834 | displaced_step_thread_state *displaced = &event_thread->displaced_step_state; |
fc1cf338 | 1835 | |
187b041e SM |
1836 | /* Was this thread performing a displaced step? */ |
1837 | if (!displaced->in_progress ()) | |
bab37966 | 1838 | return DISPLACED_STEP_FINISH_STATUS_OK; |
237fc4c9 | 1839 | |
187b041e SM |
1840 | gdb_assert (event_thread->inf->displaced_step_state.in_progress_count > 0); |
1841 | event_thread->inf->displaced_step_state.in_progress_count--; | |
1842 | ||
cb71640d PA |
1843 | /* Fixup may need to read memory/registers. Switch to the thread |
1844 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
d43b7a2d | 1845 | the current thread, and displaced_step_restore performs ptid-dependent |
328d42d8 | 1846 | memory accesses using current_inferior(). */ |
00431a78 | 1847 | switch_to_thread (event_thread); |
cb71640d | 1848 | |
d43b7a2d TBA |
1849 | displaced_step_reset_cleanup cleanup (displaced); |
1850 | ||
187b041e SM |
1851 | /* Do the fixup, and release the resources acquired to do the displaced |
1852 | step. */ | |
1853 | return gdbarch_displaced_step_finish (displaced->get_original_gdbarch (), | |
1854 | event_thread, signal); | |
c2829269 | 1855 | } |
1c5cfe86 | 1856 | |
4d9d9d04 PA |
1857 | /* Data to be passed around while handling an event. This data is |
1858 | discarded between events. */ | |
1859 | struct execution_control_state | |
1860 | { | |
5b6d1e4f | 1861 | process_stratum_target *target; |
4d9d9d04 PA |
1862 | ptid_t ptid; |
1863 | /* The thread that got the event, if this was a thread event; NULL | |
1864 | otherwise. */ | |
1865 | struct thread_info *event_thread; | |
1866 | ||
1867 | struct target_waitstatus ws; | |
1868 | int stop_func_filled_in; | |
1869 | CORE_ADDR stop_func_start; | |
1870 | CORE_ADDR stop_func_end; | |
1871 | const char *stop_func_name; | |
1872 | int wait_some_more; | |
1873 | ||
1874 | /* True if the event thread hit the single-step breakpoint of | |
1875 | another thread. Thus the event doesn't cause a stop, the thread | |
1876 | needs to be single-stepped past the single-step breakpoint before | |
1877 | we can switch back to the original stepping thread. */ | |
1878 | int hit_singlestep_breakpoint; | |
1879 | }; | |
1880 | ||
1881 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1882 | |
1883 | static void | |
4d9d9d04 PA |
1884 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1885 | { | |
1886 | memset (ecs, 0, sizeof (*ecs)); | |
1887 | ecs->event_thread = tp; | |
1888 | ecs->ptid = tp->ptid; | |
1889 | } | |
1890 | ||
1891 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1892 | static void prepare_to_wait (struct execution_control_state *ecs); | |
c4464ade | 1893 | static bool keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1894 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1895 | |
1896 | /* Are there any pending step-over requests? If so, run all we can | |
1897 | now and return true. Otherwise, return false. */ | |
1898 | ||
c4464ade | 1899 | static bool |
c2829269 PA |
1900 | start_step_over (void) |
1901 | { | |
3ec3145c SM |
1902 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
1903 | ||
187b041e | 1904 | thread_info *next; |
c2829269 | 1905 | |
372316f1 PA |
1906 | /* Don't start a new step-over if we already have an in-line |
1907 | step-over operation ongoing. */ | |
1908 | if (step_over_info_valid_p ()) | |
c4464ade | 1909 | return false; |
372316f1 | 1910 | |
187b041e SM |
1911 | /* Steal the global thread step over chain. As we try to initiate displaced |
1912 | steps, threads will be enqueued in the global chain if no buffers are | |
1913 | available. If we iterated on the global chain directly, we might iterate | |
1914 | indefinitely. */ | |
1915 | thread_info *threads_to_step = global_thread_step_over_chain_head; | |
1916 | global_thread_step_over_chain_head = NULL; | |
1917 | ||
1918 | infrun_debug_printf ("stealing global queue of threads to step, length = %d", | |
1919 | thread_step_over_chain_length (threads_to_step)); | |
1920 | ||
1921 | bool started = false; | |
1922 | ||
1923 | /* On scope exit (whatever the reason, return or exception), if there are | |
1924 | threads left in the THREADS_TO_STEP chain, put back these threads in the | |
1925 | global list. */ | |
1926 | SCOPE_EXIT | |
1927 | { | |
1928 | if (threads_to_step == nullptr) | |
1929 | infrun_debug_printf ("step-over queue now empty"); | |
1930 | else | |
1931 | { | |
1932 | infrun_debug_printf ("putting back %d threads to step in global queue", | |
1933 | thread_step_over_chain_length (threads_to_step)); | |
1934 | ||
1935 | global_thread_step_over_chain_enqueue_chain (threads_to_step); | |
1936 | } | |
1937 | }; | |
1938 | ||
1939 | for (thread_info *tp = threads_to_step; tp != NULL; tp = next) | |
237fc4c9 | 1940 | { |
4d9d9d04 PA |
1941 | struct execution_control_state ecss; |
1942 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1943 | step_over_what step_what; |
372316f1 | 1944 | int must_be_in_line; |
c2829269 | 1945 | |
c65d6b55 PA |
1946 | gdb_assert (!tp->stop_requested); |
1947 | ||
187b041e | 1948 | next = thread_step_over_chain_next (threads_to_step, tp); |
237fc4c9 | 1949 | |
187b041e SM |
1950 | if (tp->inf->displaced_step_state.unavailable) |
1951 | { | |
1952 | /* The arch told us to not even try preparing another displaced step | |
1953 | for this inferior. Just leave the thread in THREADS_TO_STEP, it | |
1954 | will get moved to the global chain on scope exit. */ | |
1955 | continue; | |
1956 | } | |
1957 | ||
8cc8b4da SM |
1958 | if (tp->inf->thread_waiting_for_vfork_done) |
1959 | { | |
1960 | /* When we stop all threads, handling a vfork, any thread in the step | |
1961 | over chain remains there. A user could also try to continue a | |
1962 | thread stopped at a breakpoint while another thread is waiting for | |
1963 | a vfork-done event. In any case, we don't want to start a step | |
1964 | over right now. */ | |
1965 | continue; | |
1966 | } | |
1967 | ||
187b041e SM |
1968 | /* Remove thread from the THREADS_TO_STEP chain. If anything goes wrong |
1969 | while we try to prepare the displaced step, we don't add it back to | |
1970 | the global step over chain. This is to avoid a thread staying in the | |
1971 | step over chain indefinitely if something goes wrong when resuming it | |
1972 | If the error is intermittent and it still needs a step over, it will | |
1973 | get enqueued again when we try to resume it normally. */ | |
1974 | thread_step_over_chain_remove (&threads_to_step, tp); | |
c2829269 | 1975 | |
372316f1 PA |
1976 | step_what = thread_still_needs_step_over (tp); |
1977 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1978 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1979 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1980 | |
1981 | /* We currently stop all threads of all processes to step-over | |
1982 | in-line. If we need to start a new in-line step-over, let | |
1983 | any pending displaced steps finish first. */ | |
187b041e SM |
1984 | if (must_be_in_line && displaced_step_in_progress_any_thread ()) |
1985 | { | |
1986 | global_thread_step_over_chain_enqueue (tp); | |
1987 | continue; | |
1988 | } | |
c2829269 | 1989 | |
372316f1 PA |
1990 | if (tp->control.trap_expected |
1991 | || tp->resumed | |
1992 | || tp->executing) | |
ad53cd71 | 1993 | { |
4d9d9d04 PA |
1994 | internal_error (__FILE__, __LINE__, |
1995 | "[%s] has inconsistent state: " | |
372316f1 | 1996 | "trap_expected=%d, resumed=%d, executing=%d\n", |
a068643d | 1997 | target_pid_to_str (tp->ptid).c_str (), |
4d9d9d04 | 1998 | tp->control.trap_expected, |
372316f1 | 1999 | tp->resumed, |
4d9d9d04 | 2000 | tp->executing); |
ad53cd71 | 2001 | } |
1c5cfe86 | 2002 | |
1eb8556f SM |
2003 | infrun_debug_printf ("resuming [%s] for step-over", |
2004 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 PA |
2005 | |
2006 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2007 | is no longer inserted. In all-stop, we want to keep looking | |
2008 | for a thread that needs a step-over instead of resuming TP, | |
2009 | because we wouldn't be able to resume anything else until the | |
2010 | target stops again. In non-stop, the resume always resumes | |
2011 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2012 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2013 | continue; |
8550d3b3 | 2014 | |
00431a78 | 2015 | switch_to_thread (tp); |
4d9d9d04 PA |
2016 | reset_ecs (ecs, tp); |
2017 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2018 | |
4d9d9d04 PA |
2019 | if (!ecs->wait_some_more) |
2020 | error (_("Command aborted.")); | |
1c5cfe86 | 2021 | |
187b041e SM |
2022 | /* If the thread's step over could not be initiated because no buffers |
2023 | were available, it was re-added to the global step over chain. */ | |
2024 | if (tp->resumed) | |
2025 | { | |
2026 | infrun_debug_printf ("[%s] was resumed.", | |
2027 | target_pid_to_str (tp->ptid).c_str ()); | |
2028 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
2029 | } | |
2030 | else | |
2031 | { | |
2032 | infrun_debug_printf ("[%s] was NOT resumed.", | |
2033 | target_pid_to_str (tp->ptid).c_str ()); | |
2034 | gdb_assert (thread_is_in_step_over_chain (tp)); | |
2035 | } | |
372316f1 PA |
2036 | |
2037 | /* If we started a new in-line step-over, we're done. */ | |
2038 | if (step_over_info_valid_p ()) | |
2039 | { | |
2040 | gdb_assert (tp->control.trap_expected); | |
187b041e SM |
2041 | started = true; |
2042 | break; | |
372316f1 PA |
2043 | } |
2044 | ||
fbea99ea | 2045 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2046 | { |
2047 | /* On all-stop, shouldn't have resumed unless we needed a | |
2048 | step over. */ | |
2049 | gdb_assert (tp->control.trap_expected | |
2050 | || tp->step_after_step_resume_breakpoint); | |
2051 | ||
2052 | /* With remote targets (at least), in all-stop, we can't | |
2053 | issue any further remote commands until the program stops | |
2054 | again. */ | |
187b041e SM |
2055 | started = true; |
2056 | break; | |
1c5cfe86 | 2057 | } |
c2829269 | 2058 | |
4d9d9d04 PA |
2059 | /* Either the thread no longer needed a step-over, or a new |
2060 | displaced stepping sequence started. Even in the latter | |
2061 | case, continue looking. Maybe we can also start another | |
2062 | displaced step on a thread of other process. */ | |
237fc4c9 | 2063 | } |
4d9d9d04 | 2064 | |
187b041e | 2065 | return started; |
237fc4c9 PA |
2066 | } |
2067 | ||
5231c1fd PA |
2068 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2069 | holding OLD_PTID. */ | |
2070 | static void | |
b161a60d SM |
2071 | infrun_thread_ptid_changed (process_stratum_target *target, |
2072 | ptid_t old_ptid, ptid_t new_ptid) | |
5231c1fd | 2073 | { |
b161a60d SM |
2074 | if (inferior_ptid == old_ptid |
2075 | && current_inferior ()->process_target () == target) | |
5231c1fd | 2076 | inferior_ptid = new_ptid; |
5231c1fd PA |
2077 | } |
2078 | ||
237fc4c9 | 2079 | \f |
c906108c | 2080 | |
53904c9e AC |
2081 | static const char schedlock_off[] = "off"; |
2082 | static const char schedlock_on[] = "on"; | |
2083 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2084 | static const char schedlock_replay[] = "replay"; |
40478521 | 2085 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2086 | schedlock_off, |
2087 | schedlock_on, | |
2088 | schedlock_step, | |
f2665db5 | 2089 | schedlock_replay, |
ef346e04 AC |
2090 | NULL |
2091 | }; | |
f2665db5 | 2092 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2093 | static void |
2094 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2095 | struct cmd_list_element *c, const char *value) | |
2096 | { | |
3e43a32a MS |
2097 | fprintf_filtered (file, |
2098 | _("Mode for locking scheduler " | |
2099 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2100 | value); |
2101 | } | |
c906108c SS |
2102 | |
2103 | static void | |
eb4c3f4a | 2104 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2105 | { |
8a3ecb79 | 2106 | if (!target_can_lock_scheduler ()) |
eefe576e AC |
2107 | { |
2108 | scheduler_mode = schedlock_off; | |
d777bf0d SM |
2109 | error (_("Target '%s' cannot support this command."), |
2110 | target_shortname ()); | |
eefe576e | 2111 | } |
c906108c SS |
2112 | } |
2113 | ||
d4db2f36 PA |
2114 | /* True if execution commands resume all threads of all processes by |
2115 | default; otherwise, resume only threads of the current inferior | |
2116 | process. */ | |
491144b5 | 2117 | bool sched_multi = false; |
d4db2f36 | 2118 | |
2facfe5c | 2119 | /* Try to setup for software single stepping over the specified location. |
c4464ade | 2120 | Return true if target_resume() should use hardware single step. |
2facfe5c DD |
2121 | |
2122 | GDBARCH the current gdbarch. | |
2123 | PC the location to step over. */ | |
2124 | ||
c4464ade | 2125 | static bool |
2facfe5c DD |
2126 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) |
2127 | { | |
c4464ade | 2128 | bool hw_step = true; |
2facfe5c | 2129 | |
f02253f1 | 2130 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2131 | && gdbarch_software_single_step_p (gdbarch)) |
2132 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2133 | ||
2facfe5c DD |
2134 | return hw_step; |
2135 | } | |
c906108c | 2136 | |
f3263aa4 PA |
2137 | /* See infrun.h. */ |
2138 | ||
09cee04b PA |
2139 | ptid_t |
2140 | user_visible_resume_ptid (int step) | |
2141 | { | |
f3263aa4 | 2142 | ptid_t resume_ptid; |
09cee04b | 2143 | |
09cee04b PA |
2144 | if (non_stop) |
2145 | { | |
2146 | /* With non-stop mode on, threads are always handled | |
2147 | individually. */ | |
2148 | resume_ptid = inferior_ptid; | |
2149 | } | |
2150 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2151 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2152 | { |
f3263aa4 PA |
2153 | /* User-settable 'scheduler' mode requires solo thread |
2154 | resume. */ | |
09cee04b PA |
2155 | resume_ptid = inferior_ptid; |
2156 | } | |
f2665db5 MM |
2157 | else if ((scheduler_mode == schedlock_replay) |
2158 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2159 | { | |
2160 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2161 | mode. */ | |
2162 | resume_ptid = inferior_ptid; | |
2163 | } | |
f3263aa4 PA |
2164 | else if (!sched_multi && target_supports_multi_process ()) |
2165 | { | |
2166 | /* Resume all threads of the current process (and none of other | |
2167 | processes). */ | |
e99b03dc | 2168 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2169 | } |
2170 | else | |
2171 | { | |
2172 | /* Resume all threads of all processes. */ | |
2173 | resume_ptid = RESUME_ALL; | |
2174 | } | |
09cee04b PA |
2175 | |
2176 | return resume_ptid; | |
2177 | } | |
2178 | ||
5b6d1e4f PA |
2179 | /* See infrun.h. */ |
2180 | ||
2181 | process_stratum_target * | |
2182 | user_visible_resume_target (ptid_t resume_ptid) | |
2183 | { | |
2184 | return (resume_ptid == minus_one_ptid && sched_multi | |
2185 | ? NULL | |
2186 | : current_inferior ()->process_target ()); | |
2187 | } | |
2188 | ||
fbea99ea PA |
2189 | /* Return a ptid representing the set of threads that we will resume, |
2190 | in the perspective of the target, assuming run control handling | |
2191 | does not require leaving some threads stopped (e.g., stepping past | |
2192 | breakpoint). USER_STEP indicates whether we're about to start the | |
2193 | target for a stepping command. */ | |
2194 | ||
2195 | static ptid_t | |
2196 | internal_resume_ptid (int user_step) | |
2197 | { | |
2198 | /* In non-stop, we always control threads individually. Note that | |
2199 | the target may always work in non-stop mode even with "set | |
2200 | non-stop off", in which case user_visible_resume_ptid could | |
2201 | return a wildcard ptid. */ | |
2202 | if (target_is_non_stop_p ()) | |
2203 | return inferior_ptid; | |
8cc8b4da SM |
2204 | |
2205 | /* The rest of the function assumes non-stop==off and | |
2206 | target-non-stop==off. | |
2207 | ||
2208 | If a thread is waiting for a vfork-done event, it means breakpoints are out | |
2209 | for this inferior (well, program space in fact). We don't want to resume | |
2210 | any thread other than the one waiting for vfork done, otherwise these other | |
2211 | threads could miss breakpoints. So if a thread in the resumption set is | |
2212 | waiting for a vfork-done event, resume only that thread. | |
2213 | ||
2214 | The resumption set width depends on whether schedule-multiple is on or off. | |
2215 | ||
2216 | Note that if the target_resume interface was more flexible, we could be | |
2217 | smarter here when schedule-multiple is on. For example, imagine 3 | |
2218 | inferiors with 2 threads each (1.1, 1.2, 2.1, 2.2, 3.1 and 3.2). Threads | |
2219 | 2.1 and 3.2 are both waiting for a vfork-done event. Then we could ask the | |
2220 | target(s) to resume: | |
2221 | ||
2222 | - All threads of inferior 1 | |
2223 | - Thread 2.1 | |
2224 | - Thread 3.2 | |
2225 | ||
2226 | Since we don't have that flexibility (we can only pass one ptid), just | |
2227 | resume the first thread waiting for a vfork-done event we find (e.g. thread | |
2228 | 2.1). */ | |
2229 | if (sched_multi) | |
2230 | { | |
2231 | for (inferior *inf : all_non_exited_inferiors ()) | |
2232 | if (inf->thread_waiting_for_vfork_done != nullptr) | |
2233 | return inf->thread_waiting_for_vfork_done->ptid; | |
2234 | } | |
2235 | else if (current_inferior ()->thread_waiting_for_vfork_done != nullptr) | |
2236 | return current_inferior ()->thread_waiting_for_vfork_done->ptid; | |
2237 | ||
2238 | return user_visible_resume_ptid (user_step); | |
fbea99ea PA |
2239 | } |
2240 | ||
64ce06e4 PA |
2241 | /* Wrapper for target_resume, that handles infrun-specific |
2242 | bookkeeping. */ | |
2243 | ||
2244 | static void | |
c4464ade | 2245 | do_target_resume (ptid_t resume_ptid, bool step, enum gdb_signal sig) |
64ce06e4 PA |
2246 | { |
2247 | struct thread_info *tp = inferior_thread (); | |
2248 | ||
c65d6b55 PA |
2249 | gdb_assert (!tp->stop_requested); |
2250 | ||
64ce06e4 | 2251 | /* Install inferior's terminal modes. */ |
223ffa71 | 2252 | target_terminal::inferior (); |
64ce06e4 PA |
2253 | |
2254 | /* Avoid confusing the next resume, if the next stop/resume | |
2255 | happens to apply to another thread. */ | |
2256 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2257 | ||
8f572e5c PA |
2258 | /* Advise target which signals may be handled silently. |
2259 | ||
2260 | If we have removed breakpoints because we are stepping over one | |
2261 | in-line (in any thread), we need to receive all signals to avoid | |
2262 | accidentally skipping a breakpoint during execution of a signal | |
2263 | handler. | |
2264 | ||
2265 | Likewise if we're displaced stepping, otherwise a trap for a | |
2266 | breakpoint in a signal handler might be confused with the | |
7def77a1 | 2267 | displaced step finishing. We don't make the displaced_step_finish |
8f572e5c PA |
2268 | step distinguish the cases instead, because: |
2269 | ||
2270 | - a backtrace while stopped in the signal handler would show the | |
2271 | scratch pad as frame older than the signal handler, instead of | |
2272 | the real mainline code. | |
2273 | ||
2274 | - when the thread is later resumed, the signal handler would | |
2275 | return to the scratch pad area, which would no longer be | |
2276 | valid. */ | |
2277 | if (step_over_info_valid_p () | |
00431a78 | 2278 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2279 | target_pass_signals ({}); |
64ce06e4 | 2280 | else |
adc6a863 | 2281 | target_pass_signals (signal_pass); |
64ce06e4 | 2282 | |
396ba09d SM |
2283 | infrun_debug_printf ("resume_ptid=%s, step=%d, sig=%s", |
2284 | resume_ptid.to_string ().c_str (), | |
2285 | step, gdb_signal_to_symbol_string (sig)); | |
2286 | ||
64ce06e4 | 2287 | target_resume (resume_ptid, step, sig); |
85ad3aaf | 2288 | |
5b6d1e4f PA |
2289 | if (target_can_async_p ()) |
2290 | target_async (1); | |
64ce06e4 PA |
2291 | } |
2292 | ||
d930703d | 2293 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2294 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2295 | call 'resume', which handles exceptions. */ | |
c906108c | 2296 | |
71d378ae PA |
2297 | static void |
2298 | resume_1 (enum gdb_signal sig) | |
c906108c | 2299 | { |
515630c5 | 2300 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2301 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2302 | struct thread_info *tp = inferior_thread (); |
8b86c959 | 2303 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2304 | ptid_t resume_ptid; |
856e7dd6 PA |
2305 | /* This represents the user's step vs continue request. When |
2306 | deciding whether "set scheduler-locking step" applies, it's the | |
2307 | user's intention that counts. */ | |
2308 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2309 | /* This represents what we'll actually request the target to do. |
2310 | This can decay from a step to a continue, if e.g., we need to | |
2311 | implement single-stepping with breakpoints (software | |
2312 | single-step). */ | |
c4464ade | 2313 | bool step; |
c7e8a53c | 2314 | |
c65d6b55 | 2315 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2316 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2317 | ||
372316f1 PA |
2318 | if (tp->suspend.waitstatus_pending_p) |
2319 | { | |
1eb8556f SM |
2320 | infrun_debug_printf |
2321 | ("thread %s has pending wait " | |
2322 | "status %s (currently_stepping=%d).", | |
2323 | target_pid_to_str (tp->ptid).c_str (), | |
2324 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2325 | currently_stepping (tp)); | |
372316f1 | 2326 | |
5b6d1e4f | 2327 | tp->inf->process_target ()->threads_executing = true; |
719546c4 | 2328 | tp->resumed = true; |
372316f1 PA |
2329 | |
2330 | /* FIXME: What should we do if we are supposed to resume this | |
2331 | thread with a signal? Maybe we should maintain a queue of | |
2332 | pending signals to deliver. */ | |
2333 | if (sig != GDB_SIGNAL_0) | |
2334 | { | |
fd7dcb94 | 2335 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d TT |
2336 | gdb_signal_to_name (sig), |
2337 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2338 | } |
2339 | ||
2340 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2341 | |
2342 | if (target_can_async_p ()) | |
9516f85a AB |
2343 | { |
2344 | target_async (1); | |
2345 | /* Tell the event loop we have an event to process. */ | |
2346 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2347 | } | |
372316f1 PA |
2348 | return; |
2349 | } | |
2350 | ||
2351 | tp->stepped_breakpoint = 0; | |
2352 | ||
6b403daa PA |
2353 | /* Depends on stepped_breakpoint. */ |
2354 | step = currently_stepping (tp); | |
2355 | ||
e6e25d5a | 2356 | if (current_inferior ()->thread_waiting_for_vfork_done != nullptr) |
74609e71 | 2357 | { |
48f9886d PA |
2358 | /* Don't try to single-step a vfork parent that is waiting for |
2359 | the child to get out of the shared memory region (by exec'ing | |
2360 | or exiting). This is particularly important on software | |
2361 | single-step archs, as the child process would trip on the | |
2362 | software single step breakpoint inserted for the parent | |
2363 | process. Since the parent will not actually execute any | |
2364 | instruction until the child is out of the shared region (such | |
2365 | are vfork's semantics), it is safe to simply continue it. | |
2366 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2367 | the parent, and tell it to `keep_going', which automatically | |
2368 | re-sets it stepping. */ | |
1eb8556f | 2369 | infrun_debug_printf ("resume : clear step"); |
c4464ade | 2370 | step = false; |
74609e71 YQ |
2371 | } |
2372 | ||
7ca9b62a TBA |
2373 | CORE_ADDR pc = regcache_read_pc (regcache); |
2374 | ||
1eb8556f SM |
2375 | infrun_debug_printf ("step=%d, signal=%s, trap_expected=%d, " |
2376 | "current thread [%s] at %s", | |
2377 | step, gdb_signal_to_symbol_string (sig), | |
2378 | tp->control.trap_expected, | |
2379 | target_pid_to_str (inferior_ptid).c_str (), | |
2380 | paddress (gdbarch, pc)); | |
c906108c | 2381 | |
c2c6d25f JM |
2382 | /* Normally, by the time we reach `resume', the breakpoints are either |
2383 | removed or inserted, as appropriate. The exception is if we're sitting | |
2384 | at a permanent breakpoint; we need to step over it, but permanent | |
2385 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2386 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2387 | { |
af48d08f PA |
2388 | if (sig != GDB_SIGNAL_0) |
2389 | { | |
2390 | /* We have a signal to pass to the inferior. The resume | |
2391 | may, or may not take us to the signal handler. If this | |
2392 | is a step, we'll need to stop in the signal handler, if | |
2393 | there's one, (if the target supports stepping into | |
2394 | handlers), or in the next mainline instruction, if | |
2395 | there's no handler. If this is a continue, we need to be | |
2396 | sure to run the handler with all breakpoints inserted. | |
2397 | In all cases, set a breakpoint at the current address | |
2398 | (where the handler returns to), and once that breakpoint | |
2399 | is hit, resume skipping the permanent breakpoint. If | |
2400 | that breakpoint isn't hit, then we've stepped into the | |
2401 | signal handler (or hit some other event). We'll delete | |
2402 | the step-resume breakpoint then. */ | |
2403 | ||
1eb8556f SM |
2404 | infrun_debug_printf ("resume: skipping permanent breakpoint, " |
2405 | "deliver signal first"); | |
af48d08f PA |
2406 | |
2407 | clear_step_over_info (); | |
2408 | tp->control.trap_expected = 0; | |
2409 | ||
2410 | if (tp->control.step_resume_breakpoint == NULL) | |
2411 | { | |
2412 | /* Set a "high-priority" step-resume, as we don't want | |
2413 | user breakpoints at PC to trigger (again) when this | |
2414 | hits. */ | |
2415 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2416 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2417 | ||
2418 | tp->step_after_step_resume_breakpoint = step; | |
2419 | } | |
2420 | ||
2421 | insert_breakpoints (); | |
2422 | } | |
2423 | else | |
2424 | { | |
2425 | /* There's no signal to pass, we can go ahead and skip the | |
2426 | permanent breakpoint manually. */ | |
1eb8556f | 2427 | infrun_debug_printf ("skipping permanent breakpoint"); |
af48d08f PA |
2428 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); |
2429 | /* Update pc to reflect the new address from which we will | |
2430 | execute instructions. */ | |
2431 | pc = regcache_read_pc (regcache); | |
2432 | ||
2433 | if (step) | |
2434 | { | |
2435 | /* We've already advanced the PC, so the stepping part | |
2436 | is done. Now we need to arrange for a trap to be | |
2437 | reported to handle_inferior_event. Set a breakpoint | |
2438 | at the current PC, and run to it. Don't update | |
2439 | prev_pc, because if we end in | |
44a1ee51 PA |
2440 | switch_back_to_stepped_thread, we want the "expected |
2441 | thread advanced also" branch to be taken. IOW, we | |
2442 | don't want this thread to step further from PC | |
af48d08f | 2443 | (overstep). */ |
1ac806b8 | 2444 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2445 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2446 | insert_breakpoints (); | |
2447 | ||
fbea99ea | 2448 | resume_ptid = internal_resume_ptid (user_step); |
c4464ade | 2449 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
719546c4 | 2450 | tp->resumed = true; |
af48d08f PA |
2451 | return; |
2452 | } | |
2453 | } | |
6d350bb5 | 2454 | } |
c2c6d25f | 2455 | |
c1e36e3e PA |
2456 | /* If we have a breakpoint to step over, make sure to do a single |
2457 | step only. Same if we have software watchpoints. */ | |
2458 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2459 | tp->control.may_range_step = 0; | |
2460 | ||
7da6a5b9 LM |
2461 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2462 | copy of the instruction at a different address. | |
237fc4c9 PA |
2463 | |
2464 | We can't use displaced stepping when we have a signal to deliver; | |
2465 | the comments for displaced_step_prepare explain why. The | |
2466 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2467 | signals' explain what we do instead. |
2468 | ||
2469 | We can't use displaced stepping when we are waiting for vfork_done | |
2470 | event, displaced stepping breaks the vfork child similarly as single | |
2471 | step software breakpoint. */ | |
3fc8eb30 PA |
2472 | if (tp->control.trap_expected |
2473 | && use_displaced_stepping (tp) | |
cb71640d | 2474 | && !step_over_info_valid_p () |
a493e3e2 | 2475 | && sig == GDB_SIGNAL_0 |
e6e25d5a | 2476 | && current_inferior ()->thread_waiting_for_vfork_done == nullptr) |
237fc4c9 | 2477 | { |
bab37966 SM |
2478 | displaced_step_prepare_status prepare_status |
2479 | = displaced_step_prepare (tp); | |
fc1cf338 | 2480 | |
bab37966 | 2481 | if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
d56b7306 | 2482 | { |
1eb8556f | 2483 | infrun_debug_printf ("Got placed in step-over queue"); |
4d9d9d04 PA |
2484 | |
2485 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2486 | return; |
2487 | } | |
bab37966 | 2488 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_CANT) |
3fc8eb30 PA |
2489 | { |
2490 | /* Fallback to stepping over the breakpoint in-line. */ | |
2491 | ||
2492 | if (target_is_non_stop_p ()) | |
2bf06f96 | 2493 | stop_all_threads ("displaced stepping falling back on inline stepping"); |
3fc8eb30 | 2494 | |
a01bda52 | 2495 | set_step_over_info (regcache->aspace (), |
21edc42f | 2496 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2497 | |
2498 | step = maybe_software_singlestep (gdbarch, pc); | |
2499 | ||
2500 | insert_breakpoints (); | |
2501 | } | |
bab37966 | 2502 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_OK) |
3fc8eb30 | 2503 | { |
3fc8eb30 PA |
2504 | /* Update pc to reflect the new address from which we will |
2505 | execute instructions due to displaced stepping. */ | |
00431a78 | 2506 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2507 | |
40a53766 | 2508 | step = gdbarch_displaced_step_hw_singlestep (gdbarch); |
3fc8eb30 | 2509 | } |
bab37966 SM |
2510 | else |
2511 | gdb_assert_not_reached (_("Invalid displaced_step_prepare_status " | |
2512 | "value.")); | |
237fc4c9 PA |
2513 | } |
2514 | ||
2facfe5c | 2515 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2516 | else if (step) |
2facfe5c | 2517 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2518 | |
30852783 UW |
2519 | /* Currently, our software single-step implementation leads to different |
2520 | results than hardware single-stepping in one situation: when stepping | |
2521 | into delivering a signal which has an associated signal handler, | |
2522 | hardware single-step will stop at the first instruction of the handler, | |
2523 | while software single-step will simply skip execution of the handler. | |
2524 | ||
2525 | For now, this difference in behavior is accepted since there is no | |
2526 | easy way to actually implement single-stepping into a signal handler | |
2527 | without kernel support. | |
2528 | ||
2529 | However, there is one scenario where this difference leads to follow-on | |
2530 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2531 | and then single-stepping. In this case, the software single-step | |
2532 | behavior means that even if there is a *breakpoint* in the signal | |
2533 | handler, GDB still would not stop. | |
2534 | ||
2535 | Fortunately, we can at least fix this particular issue. We detect | |
2536 | here the case where we are about to deliver a signal while software | |
2537 | single-stepping with breakpoints removed. In this situation, we | |
2538 | revert the decisions to remove all breakpoints and insert single- | |
2539 | step breakpoints, and instead we install a step-resume breakpoint | |
2540 | at the current address, deliver the signal without stepping, and | |
2541 | once we arrive back at the step-resume breakpoint, actually step | |
2542 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2543 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2544 | && sig != GDB_SIGNAL_0 |
2545 | && step_over_info_valid_p ()) | |
30852783 UW |
2546 | { |
2547 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2548 | immediately after a handler returns, might already have |
30852783 UW |
2549 | a step-resume breakpoint set on the earlier handler. We cannot |
2550 | set another step-resume breakpoint; just continue on until the | |
2551 | original breakpoint is hit. */ | |
2552 | if (tp->control.step_resume_breakpoint == NULL) | |
2553 | { | |
2c03e5be | 2554 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2555 | tp->step_after_step_resume_breakpoint = 1; |
2556 | } | |
2557 | ||
34b7e8a6 | 2558 | delete_single_step_breakpoints (tp); |
30852783 | 2559 | |
31e77af2 | 2560 | clear_step_over_info (); |
30852783 | 2561 | tp->control.trap_expected = 0; |
31e77af2 PA |
2562 | |
2563 | insert_breakpoints (); | |
30852783 UW |
2564 | } |
2565 | ||
b0f16a3e SM |
2566 | /* If STEP is set, it's a request to use hardware stepping |
2567 | facilities. But in that case, we should never | |
2568 | use singlestep breakpoint. */ | |
34b7e8a6 | 2569 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2570 | |
fbea99ea | 2571 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2572 | if (tp->control.trap_expected) |
b0f16a3e SM |
2573 | { |
2574 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2575 | hit, either by single-stepping the thread with the breakpoint |
2576 | removed, or by displaced stepping, with the breakpoint inserted. | |
2577 | In the former case, we need to single-step only this thread, | |
2578 | and keep others stopped, as they can miss this breakpoint if | |
2579 | allowed to run. That's not really a problem for displaced | |
2580 | stepping, but, we still keep other threads stopped, in case | |
2581 | another thread is also stopped for a breakpoint waiting for | |
2582 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2583 | resume_ptid = inferior_ptid; |
2584 | } | |
fbea99ea PA |
2585 | else |
2586 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2587 | |
7f5ef605 PA |
2588 | if (execution_direction != EXEC_REVERSE |
2589 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2590 | { |
372316f1 PA |
2591 | /* There are two cases where we currently need to step a |
2592 | breakpoint instruction when we have a signal to deliver: | |
2593 | ||
2594 | - See handle_signal_stop where we handle random signals that | |
2595 | could take out us out of the stepping range. Normally, in | |
2596 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2597 | signal handler with a breakpoint at PC, but there are cases |
2598 | where we should _always_ single-step, even if we have a | |
2599 | step-resume breakpoint, like when a software watchpoint is | |
2600 | set. Assuming single-stepping and delivering a signal at the | |
2601 | same time would takes us to the signal handler, then we could | |
2602 | have removed the breakpoint at PC to step over it. However, | |
2603 | some hardware step targets (like e.g., Mac OS) can't step | |
2604 | into signal handlers, and for those, we need to leave the | |
2605 | breakpoint at PC inserted, as otherwise if the handler | |
2606 | recurses and executes PC again, it'll miss the breakpoint. | |
2607 | So we leave the breakpoint inserted anyway, but we need to | |
2608 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2609 | that adjust_pc_after_break doesn't end up confused. |
2610 | ||
dda83cd7 | 2611 | - In non-stop if we insert a breakpoint (e.g., a step-resume) |
372316f1 PA |
2612 | in one thread after another thread that was stepping had been |
2613 | momentarily paused for a step-over. When we re-resume the | |
2614 | stepping thread, it may be resumed from that address with a | |
2615 | breakpoint that hasn't trapped yet. Seen with | |
2616 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2617 | do displaced stepping. */ | |
2618 | ||
1eb8556f SM |
2619 | infrun_debug_printf ("resume: [%s] stepped breakpoint", |
2620 | target_pid_to_str (tp->ptid).c_str ()); | |
7f5ef605 PA |
2621 | |
2622 | tp->stepped_breakpoint = 1; | |
2623 | ||
b0f16a3e SM |
2624 | /* Most targets can step a breakpoint instruction, thus |
2625 | executing it normally. But if this one cannot, just | |
2626 | continue and we will hit it anyway. */ | |
7f5ef605 | 2627 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4464ade | 2628 | step = false; |
b0f16a3e | 2629 | } |
ef5cf84e | 2630 | |
b0f16a3e | 2631 | if (debug_displaced |
cb71640d | 2632 | && tp->control.trap_expected |
3fc8eb30 | 2633 | && use_displaced_stepping (tp) |
cb71640d | 2634 | && !step_over_info_valid_p ()) |
b0f16a3e | 2635 | { |
00431a78 | 2636 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2637 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2638 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2639 | gdb_byte buf[4]; | |
2640 | ||
b0f16a3e | 2641 | read_memory (actual_pc, buf, sizeof (buf)); |
136821d9 SM |
2642 | displaced_debug_printf ("run %s: %s", |
2643 | paddress (resume_gdbarch, actual_pc), | |
2644 | displaced_step_dump_bytes | |
2645 | (buf, sizeof (buf)).c_str ()); | |
b0f16a3e | 2646 | } |
237fc4c9 | 2647 | |
b0f16a3e SM |
2648 | if (tp->control.may_range_step) |
2649 | { | |
2650 | /* If we're resuming a thread with the PC out of the step | |
2651 | range, then we're doing some nested/finer run control | |
2652 | operation, like stepping the thread out of the dynamic | |
2653 | linker or the displaced stepping scratch pad. We | |
2654 | shouldn't have allowed a range step then. */ | |
2655 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2656 | } | |
c1e36e3e | 2657 | |
64ce06e4 | 2658 | do_target_resume (resume_ptid, step, sig); |
719546c4 | 2659 | tp->resumed = true; |
c906108c | 2660 | } |
71d378ae PA |
2661 | |
2662 | /* Resume the inferior. SIG is the signal to give the inferior | |
2663 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2664 | rolls back state on error. */ | |
2665 | ||
aff4e175 | 2666 | static void |
71d378ae PA |
2667 | resume (gdb_signal sig) |
2668 | { | |
a70b8144 | 2669 | try |
71d378ae PA |
2670 | { |
2671 | resume_1 (sig); | |
2672 | } | |
230d2906 | 2673 | catch (const gdb_exception &ex) |
71d378ae PA |
2674 | { |
2675 | /* If resuming is being aborted for any reason, delete any | |
2676 | single-step breakpoint resume_1 may have created, to avoid | |
2677 | confusing the following resumption, and to avoid leaving | |
2678 | single-step breakpoints perturbing other threads, in case | |
2679 | we're running in non-stop mode. */ | |
2680 | if (inferior_ptid != null_ptid) | |
2681 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2682 | throw; |
71d378ae | 2683 | } |
71d378ae PA |
2684 | } |
2685 | ||
c906108c | 2686 | \f |
237fc4c9 | 2687 | /* Proceeding. */ |
c906108c | 2688 | |
4c2f2a79 PA |
2689 | /* See infrun.h. */ |
2690 | ||
2691 | /* Counter that tracks number of user visible stops. This can be used | |
2692 | to tell whether a command has proceeded the inferior past the | |
2693 | current location. This allows e.g., inferior function calls in | |
2694 | breakpoint commands to not interrupt the command list. When the | |
2695 | call finishes successfully, the inferior is standing at the same | |
2696 | breakpoint as if nothing happened (and so we don't call | |
2697 | normal_stop). */ | |
2698 | static ULONGEST current_stop_id; | |
2699 | ||
2700 | /* See infrun.h. */ | |
2701 | ||
2702 | ULONGEST | |
2703 | get_stop_id (void) | |
2704 | { | |
2705 | return current_stop_id; | |
2706 | } | |
2707 | ||
2708 | /* Called when we report a user visible stop. */ | |
2709 | ||
2710 | static void | |
2711 | new_stop_id (void) | |
2712 | { | |
2713 | current_stop_id++; | |
2714 | } | |
2715 | ||
c906108c SS |
2716 | /* Clear out all variables saying what to do when inferior is continued. |
2717 | First do this, then set the ones you want, then call `proceed'. */ | |
2718 | ||
a7212384 UW |
2719 | static void |
2720 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2721 | { |
1eb8556f | 2722 | infrun_debug_printf ("%s", target_pid_to_str (tp->ptid).c_str ()); |
d6b48e9c | 2723 | |
372316f1 PA |
2724 | /* If we're starting a new sequence, then the previous finished |
2725 | single-step is no longer relevant. */ | |
2726 | if (tp->suspend.waitstatus_pending_p) | |
2727 | { | |
2728 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2729 | { | |
1eb8556f SM |
2730 | infrun_debug_printf ("pending event of %s was a finished step. " |
2731 | "Discarding.", | |
2732 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2733 | |
2734 | tp->suspend.waitstatus_pending_p = 0; | |
2735 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2736 | } | |
1eb8556f | 2737 | else |
372316f1 | 2738 | { |
1eb8556f SM |
2739 | infrun_debug_printf |
2740 | ("thread %s has pending wait status %s (currently_stepping=%d).", | |
2741 | target_pid_to_str (tp->ptid).c_str (), | |
2742 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2743 | currently_stepping (tp)); | |
372316f1 PA |
2744 | } |
2745 | } | |
2746 | ||
70509625 PA |
2747 | /* If this signal should not be seen by program, give it zero. |
2748 | Used for debugging signals. */ | |
2749 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2750 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2751 | ||
46e3ed7f | 2752 | delete tp->thread_fsm; |
243a9253 PA |
2753 | tp->thread_fsm = NULL; |
2754 | ||
16c381f0 JK |
2755 | tp->control.trap_expected = 0; |
2756 | tp->control.step_range_start = 0; | |
2757 | tp->control.step_range_end = 0; | |
c1e36e3e | 2758 | tp->control.may_range_step = 0; |
16c381f0 JK |
2759 | tp->control.step_frame_id = null_frame_id; |
2760 | tp->control.step_stack_frame_id = null_frame_id; | |
2761 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2762 | tp->control.step_start_function = NULL; |
a7212384 | 2763 | tp->stop_requested = 0; |
4e1c45ea | 2764 | |
16c381f0 | 2765 | tp->control.stop_step = 0; |
32400beb | 2766 | |
16c381f0 | 2767 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2768 | |
856e7dd6 | 2769 | tp->control.stepping_command = 0; |
17b2616c | 2770 | |
a7212384 | 2771 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2772 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2773 | } |
32400beb | 2774 | |
a7212384 | 2775 | void |
70509625 | 2776 | clear_proceed_status (int step) |
a7212384 | 2777 | { |
f2665db5 MM |
2778 | /* With scheduler-locking replay, stop replaying other threads if we're |
2779 | not replaying the user-visible resume ptid. | |
2780 | ||
2781 | This is a convenience feature to not require the user to explicitly | |
2782 | stop replaying the other threads. We're assuming that the user's | |
2783 | intent is to resume tracing the recorded process. */ | |
2784 | if (!non_stop && scheduler_mode == schedlock_replay | |
2785 | && target_record_is_replaying (minus_one_ptid) | |
2786 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2787 | execution_direction)) | |
2788 | target_record_stop_replaying (); | |
2789 | ||
08036331 | 2790 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2791 | { |
08036331 | 2792 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2793 | process_stratum_target *resume_target |
2794 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2795 | |
2796 | /* In all-stop mode, delete the per-thread status of all threads | |
2797 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2798 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2799 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2800 | } |
2801 | ||
d7e15655 | 2802 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2803 | { |
2804 | struct inferior *inferior; | |
2805 | ||
2806 | if (non_stop) | |
2807 | { | |
6c95b8df PA |
2808 | /* If in non-stop mode, only delete the per-thread status of |
2809 | the current thread. */ | |
a7212384 UW |
2810 | clear_proceed_status_thread (inferior_thread ()); |
2811 | } | |
6c95b8df | 2812 | |
d6b48e9c | 2813 | inferior = current_inferior (); |
16c381f0 | 2814 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2815 | } |
2816 | ||
76727919 | 2817 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2818 | } |
2819 | ||
99619bea PA |
2820 | /* Returns true if TP is still stopped at a breakpoint that needs |
2821 | stepping-over in order to make progress. If the breakpoint is gone | |
2822 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b | 2823 | |
c4464ade | 2824 | static bool |
6c4cfb24 | 2825 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2826 | { |
2827 | if (tp->stepping_over_breakpoint) | |
2828 | { | |
00431a78 | 2829 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2830 | |
a01bda52 | 2831 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2832 | regcache_read_pc (regcache)) |
2833 | == ordinary_breakpoint_here) | |
c4464ade | 2834 | return true; |
99619bea PA |
2835 | |
2836 | tp->stepping_over_breakpoint = 0; | |
2837 | } | |
2838 | ||
c4464ade | 2839 | return false; |
99619bea PA |
2840 | } |
2841 | ||
6c4cfb24 PA |
2842 | /* Check whether thread TP still needs to start a step-over in order |
2843 | to make progress when resumed. Returns an bitwise or of enum | |
2844 | step_over_what bits, indicating what needs to be stepped over. */ | |
2845 | ||
8d297bbf | 2846 | static step_over_what |
6c4cfb24 PA |
2847 | thread_still_needs_step_over (struct thread_info *tp) |
2848 | { | |
8d297bbf | 2849 | step_over_what what = 0; |
6c4cfb24 PA |
2850 | |
2851 | if (thread_still_needs_step_over_bp (tp)) | |
2852 | what |= STEP_OVER_BREAKPOINT; | |
2853 | ||
2854 | if (tp->stepping_over_watchpoint | |
9aed480c | 2855 | && !target_have_steppable_watchpoint ()) |
6c4cfb24 PA |
2856 | what |= STEP_OVER_WATCHPOINT; |
2857 | ||
2858 | return what; | |
2859 | } | |
2860 | ||
483805cf PA |
2861 | /* Returns true if scheduler locking applies. STEP indicates whether |
2862 | we're about to do a step/next-like command to a thread. */ | |
2863 | ||
c4464ade | 2864 | static bool |
856e7dd6 | 2865 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2866 | { |
2867 | return (scheduler_mode == schedlock_on | |
2868 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2869 | && tp->control.stepping_command) |
2870 | || (scheduler_mode == schedlock_replay | |
2871 | && target_record_will_replay (minus_one_ptid, | |
2872 | execution_direction))); | |
483805cf PA |
2873 | } |
2874 | ||
1192f124 SM |
2875 | /* Set process_stratum_target::COMMIT_RESUMED_STATE in all target |
2876 | stacks that have threads executing and don't have threads with | |
2877 | pending events. */ | |
5b6d1e4f PA |
2878 | |
2879 | static void | |
1192f124 SM |
2880 | maybe_set_commit_resumed_all_targets () |
2881 | { | |
b4b1a226 SM |
2882 | scoped_restore_current_thread restore_thread; |
2883 | ||
1192f124 SM |
2884 | for (inferior *inf : all_non_exited_inferiors ()) |
2885 | { | |
2886 | process_stratum_target *proc_target = inf->process_target (); | |
2887 | ||
2888 | if (proc_target->commit_resumed_state) | |
2889 | { | |
2890 | /* We already set this in a previous iteration, via another | |
2891 | inferior sharing the process_stratum target. */ | |
2892 | continue; | |
2893 | } | |
2894 | ||
2895 | /* If the target has no resumed threads, it would be useless to | |
2896 | ask it to commit the resumed threads. */ | |
2897 | if (!proc_target->threads_executing) | |
2898 | { | |
2899 | infrun_debug_printf ("not requesting commit-resumed for target " | |
2900 | "%s, no resumed threads", | |
2901 | proc_target->shortname ()); | |
2902 | continue; | |
2903 | } | |
2904 | ||
2905 | /* As an optimization, if a thread from this target has some | |
2906 | status to report, handle it before requiring the target to | |
2907 | commit its resumed threads: handling the status might lead to | |
2908 | resuming more threads. */ | |
2909 | bool has_thread_with_pending_status = false; | |
2910 | for (thread_info *thread : all_non_exited_threads (proc_target)) | |
2911 | if (thread->resumed && thread->suspend.waitstatus_pending_p) | |
2912 | { | |
2913 | has_thread_with_pending_status = true; | |
2914 | break; | |
2915 | } | |
2916 | ||
2917 | if (has_thread_with_pending_status) | |
2918 | { | |
2919 | infrun_debug_printf ("not requesting commit-resumed for target %s, a" | |
2920 | " thread has a pending waitstatus", | |
2921 | proc_target->shortname ()); | |
2922 | continue; | |
2923 | } | |
2924 | ||
b4b1a226 SM |
2925 | switch_to_inferior_no_thread (inf); |
2926 | ||
2927 | if (target_has_pending_events ()) | |
2928 | { | |
2929 | infrun_debug_printf ("not requesting commit-resumed for target %s, " | |
2930 | "target has pending events", | |
2931 | proc_target->shortname ()); | |
2932 | continue; | |
2933 | } | |
2934 | ||
1192f124 SM |
2935 | infrun_debug_printf ("enabling commit-resumed for target %s", |
2936 | proc_target->shortname ()); | |
2937 | ||
2938 | proc_target->commit_resumed_state = true; | |
2939 | } | |
2940 | } | |
2941 | ||
2942 | /* See infrun.h. */ | |
2943 | ||
2944 | void | |
2945 | maybe_call_commit_resumed_all_targets () | |
5b6d1e4f PA |
2946 | { |
2947 | scoped_restore_current_thread restore_thread; | |
2948 | ||
1192f124 SM |
2949 | for (inferior *inf : all_non_exited_inferiors ()) |
2950 | { | |
2951 | process_stratum_target *proc_target = inf->process_target (); | |
2952 | ||
2953 | if (!proc_target->commit_resumed_state) | |
2954 | continue; | |
2955 | ||
2956 | switch_to_inferior_no_thread (inf); | |
2957 | ||
2958 | infrun_debug_printf ("calling commit_resumed for target %s", | |
2959 | proc_target->shortname()); | |
2960 | ||
2961 | target_commit_resumed (); | |
2962 | } | |
2963 | } | |
2964 | ||
2965 | /* To track nesting of scoped_disable_commit_resumed objects, ensuring | |
2966 | that only the outermost one attempts to re-enable | |
2967 | commit-resumed. */ | |
2968 | static bool enable_commit_resumed = true; | |
2969 | ||
2970 | /* See infrun.h. */ | |
2971 | ||
2972 | scoped_disable_commit_resumed::scoped_disable_commit_resumed | |
2973 | (const char *reason) | |
2974 | : m_reason (reason), | |
2975 | m_prev_enable_commit_resumed (enable_commit_resumed) | |
2976 | { | |
2977 | infrun_debug_printf ("reason=%s", m_reason); | |
2978 | ||
2979 | enable_commit_resumed = false; | |
5b6d1e4f PA |
2980 | |
2981 | for (inferior *inf : all_non_exited_inferiors ()) | |
1192f124 SM |
2982 | { |
2983 | process_stratum_target *proc_target = inf->process_target (); | |
5b6d1e4f | 2984 | |
1192f124 SM |
2985 | if (m_prev_enable_commit_resumed) |
2986 | { | |
2987 | /* This is the outermost instance: force all | |
2988 | COMMIT_RESUMED_STATE to false. */ | |
2989 | proc_target->commit_resumed_state = false; | |
2990 | } | |
2991 | else | |
2992 | { | |
2993 | /* This is not the outermost instance, we expect | |
2994 | COMMIT_RESUMED_STATE to have been cleared by the | |
2995 | outermost instance. */ | |
2996 | gdb_assert (!proc_target->commit_resumed_state); | |
2997 | } | |
2998 | } | |
2999 | } | |
3000 | ||
3001 | /* See infrun.h. */ | |
3002 | ||
3003 | void | |
3004 | scoped_disable_commit_resumed::reset () | |
3005 | { | |
3006 | if (m_reset) | |
3007 | return; | |
3008 | m_reset = true; | |
3009 | ||
3010 | infrun_debug_printf ("reason=%s", m_reason); | |
3011 | ||
3012 | gdb_assert (!enable_commit_resumed); | |
3013 | ||
3014 | enable_commit_resumed = m_prev_enable_commit_resumed; | |
3015 | ||
3016 | if (m_prev_enable_commit_resumed) | |
5b6d1e4f | 3017 | { |
1192f124 SM |
3018 | /* This is the outermost instance, re-enable |
3019 | COMMIT_RESUMED_STATE on the targets where it's possible. */ | |
3020 | maybe_set_commit_resumed_all_targets (); | |
3021 | } | |
3022 | else | |
3023 | { | |
3024 | /* This is not the outermost instance, we expect | |
3025 | COMMIT_RESUMED_STATE to still be false. */ | |
3026 | for (inferior *inf : all_non_exited_inferiors ()) | |
3027 | { | |
3028 | process_stratum_target *proc_target = inf->process_target (); | |
3029 | gdb_assert (!proc_target->commit_resumed_state); | |
3030 | } | |
3031 | } | |
3032 | } | |
3033 | ||
3034 | /* See infrun.h. */ | |
3035 | ||
3036 | scoped_disable_commit_resumed::~scoped_disable_commit_resumed () | |
3037 | { | |
3038 | reset (); | |
3039 | } | |
3040 | ||
3041 | /* See infrun.h. */ | |
3042 | ||
3043 | void | |
3044 | scoped_disable_commit_resumed::reset_and_commit () | |
3045 | { | |
3046 | reset (); | |
3047 | maybe_call_commit_resumed_all_targets (); | |
3048 | } | |
3049 | ||
3050 | /* See infrun.h. */ | |
3051 | ||
3052 | scoped_enable_commit_resumed::scoped_enable_commit_resumed | |
3053 | (const char *reason) | |
3054 | : m_reason (reason), | |
3055 | m_prev_enable_commit_resumed (enable_commit_resumed) | |
3056 | { | |
3057 | infrun_debug_printf ("reason=%s", m_reason); | |
3058 | ||
3059 | if (!enable_commit_resumed) | |
3060 | { | |
3061 | enable_commit_resumed = true; | |
3062 | ||
3063 | /* Re-enable COMMIT_RESUMED_STATE on the targets where it's | |
3064 | possible. */ | |
3065 | maybe_set_commit_resumed_all_targets (); | |
3066 | ||
3067 | maybe_call_commit_resumed_all_targets (); | |
3068 | } | |
3069 | } | |
3070 | ||
3071 | /* See infrun.h. */ | |
3072 | ||
3073 | scoped_enable_commit_resumed::~scoped_enable_commit_resumed () | |
3074 | { | |
3075 | infrun_debug_printf ("reason=%s", m_reason); | |
3076 | ||
3077 | gdb_assert (enable_commit_resumed); | |
3078 | ||
3079 | enable_commit_resumed = m_prev_enable_commit_resumed; | |
3080 | ||
3081 | if (!enable_commit_resumed) | |
3082 | { | |
3083 | /* Force all COMMIT_RESUMED_STATE back to false. */ | |
3084 | for (inferior *inf : all_non_exited_inferiors ()) | |
3085 | { | |
3086 | process_stratum_target *proc_target = inf->process_target (); | |
3087 | proc_target->commit_resumed_state = false; | |
3088 | } | |
5b6d1e4f PA |
3089 | } |
3090 | } | |
3091 | ||
2f4fcf00 PA |
3092 | /* Check that all the targets we're about to resume are in non-stop |
3093 | mode. Ideally, we'd only care whether all targets support | |
3094 | target-async, but we're not there yet. E.g., stop_all_threads | |
3095 | doesn't know how to handle all-stop targets. Also, the remote | |
3096 | protocol in all-stop mode is synchronous, irrespective of | |
3097 | target-async, which means that things like a breakpoint re-set | |
3098 | triggered by one target would try to read memory from all targets | |
3099 | and fail. */ | |
3100 | ||
3101 | static void | |
3102 | check_multi_target_resumption (process_stratum_target *resume_target) | |
3103 | { | |
3104 | if (!non_stop && resume_target == nullptr) | |
3105 | { | |
3106 | scoped_restore_current_thread restore_thread; | |
3107 | ||
3108 | /* This is used to track whether we're resuming more than one | |
3109 | target. */ | |
3110 | process_stratum_target *first_connection = nullptr; | |
3111 | ||
3112 | /* The first inferior we see with a target that does not work in | |
3113 | always-non-stop mode. */ | |
3114 | inferior *first_not_non_stop = nullptr; | |
3115 | ||
f058c521 | 3116 | for (inferior *inf : all_non_exited_inferiors ()) |
2f4fcf00 PA |
3117 | { |
3118 | switch_to_inferior_no_thread (inf); | |
3119 | ||
55f6301a | 3120 | if (!target_has_execution ()) |
2f4fcf00 PA |
3121 | continue; |
3122 | ||
3123 | process_stratum_target *proc_target | |
3124 | = current_inferior ()->process_target(); | |
3125 | ||
3126 | if (!target_is_non_stop_p ()) | |
3127 | first_not_non_stop = inf; | |
3128 | ||
3129 | if (first_connection == nullptr) | |
3130 | first_connection = proc_target; | |
3131 | else if (first_connection != proc_target | |
3132 | && first_not_non_stop != nullptr) | |
3133 | { | |
3134 | switch_to_inferior_no_thread (first_not_non_stop); | |
3135 | ||
3136 | proc_target = current_inferior ()->process_target(); | |
3137 | ||
3138 | error (_("Connection %d (%s) does not support " | |
3139 | "multi-target resumption."), | |
3140 | proc_target->connection_number, | |
3141 | make_target_connection_string (proc_target).c_str ()); | |
3142 | } | |
3143 | } | |
3144 | } | |
3145 | } | |
3146 | ||
c906108c SS |
3147 | /* Basic routine for continuing the program in various fashions. |
3148 | ||
3149 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
3150 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
3151 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
3152 | |
3153 | You should call clear_proceed_status before calling proceed. */ | |
3154 | ||
3155 | void | |
64ce06e4 | 3156 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 3157 | { |
3ec3145c SM |
3158 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
3159 | ||
e58b0e63 PA |
3160 | struct regcache *regcache; |
3161 | struct gdbarch *gdbarch; | |
e58b0e63 | 3162 | CORE_ADDR pc; |
4d9d9d04 PA |
3163 | struct execution_control_state ecss; |
3164 | struct execution_control_state *ecs = &ecss; | |
c4464ade | 3165 | bool started; |
c906108c | 3166 | |
e58b0e63 PA |
3167 | /* If we're stopped at a fork/vfork, follow the branch set by the |
3168 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
3169 | resuming the current thread. */ | |
3170 | if (!follow_fork ()) | |
3171 | { | |
3172 | /* The target for some reason decided not to resume. */ | |
3173 | normal_stop (); | |
f148b27e | 3174 | if (target_can_async_p ()) |
b1a35af2 | 3175 | inferior_event_handler (INF_EXEC_COMPLETE); |
e58b0e63 PA |
3176 | return; |
3177 | } | |
3178 | ||
842951eb PA |
3179 | /* We'll update this if & when we switch to a new thread. */ |
3180 | previous_inferior_ptid = inferior_ptid; | |
3181 | ||
e58b0e63 | 3182 | regcache = get_current_regcache (); |
ac7936df | 3183 | gdbarch = regcache->arch (); |
8b86c959 YQ |
3184 | const address_space *aspace = regcache->aspace (); |
3185 | ||
fc75c28b TBA |
3186 | pc = regcache_read_pc_protected (regcache); |
3187 | ||
08036331 | 3188 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 3189 | |
99619bea | 3190 | /* Fill in with reasonable starting values. */ |
08036331 | 3191 | init_thread_stepping_state (cur_thr); |
99619bea | 3192 | |
08036331 | 3193 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 3194 | |
5b6d1e4f PA |
3195 | ptid_t resume_ptid |
3196 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
3197 | process_stratum_target *resume_target | |
3198 | = user_visible_resume_target (resume_ptid); | |
3199 | ||
2f4fcf00 PA |
3200 | check_multi_target_resumption (resume_target); |
3201 | ||
2acceee2 | 3202 | if (addr == (CORE_ADDR) -1) |
c906108c | 3203 | { |
08036331 | 3204 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 3205 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 3206 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
3207 | /* There is a breakpoint at the address we will resume at, |
3208 | step one instruction before inserting breakpoints so that | |
3209 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
3210 | breakpoint). |
3211 | ||
3212 | Note, we don't do this in reverse, because we won't | |
3213 | actually be executing the breakpoint insn anyway. | |
3214 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 3215 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
3216 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3217 | && gdbarch_single_step_through_delay (gdbarch, | |
3218 | get_current_frame ())) | |
3352ef37 AC |
3219 | /* We stepped onto an instruction that needs to be stepped |
3220 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 3221 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
3222 | } |
3223 | else | |
3224 | { | |
515630c5 | 3225 | regcache_write_pc (regcache, addr); |
c906108c SS |
3226 | } |
3227 | ||
70509625 | 3228 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 3229 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 3230 | |
4d9d9d04 PA |
3231 | /* If an exception is thrown from this point on, make sure to |
3232 | propagate GDB's knowledge of the executing state to the | |
3233 | frontend/user running state. */ | |
5b6d1e4f | 3234 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
3235 | |
3236 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3237 | threads (e.g., we might need to set threads stepping over | |
3238 | breakpoints first), from the user/frontend's point of view, all | |
3239 | threads in RESUME_PTID are now running. Unless we're calling an | |
3240 | inferior function, as in that case we pretend the inferior | |
3241 | doesn't run at all. */ | |
08036331 | 3242 | if (!cur_thr->control.in_infcall) |
719546c4 | 3243 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3244 | |
1eb8556f SM |
3245 | infrun_debug_printf ("addr=%s, signal=%s", paddress (gdbarch, addr), |
3246 | gdb_signal_to_symbol_string (siggnal)); | |
527159b7 | 3247 | |
4d9d9d04 PA |
3248 | annotate_starting (); |
3249 | ||
3250 | /* Make sure that output from GDB appears before output from the | |
3251 | inferior. */ | |
3252 | gdb_flush (gdb_stdout); | |
3253 | ||
d930703d PA |
3254 | /* Since we've marked the inferior running, give it the terminal. A |
3255 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3256 | still detect attempts to unblock a stuck connection with repeated | |
3257 | Ctrl-C from within target_pass_ctrlc). */ | |
3258 | target_terminal::inferior (); | |
3259 | ||
4d9d9d04 PA |
3260 | /* In a multi-threaded task we may select another thread and |
3261 | then continue or step. | |
3262 | ||
3263 | But if a thread that we're resuming had stopped at a breakpoint, | |
3264 | it will immediately cause another breakpoint stop without any | |
3265 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3266 | we must step over it first. | |
3267 | ||
3268 | Look for threads other than the current (TP) that reported a | |
3269 | breakpoint hit and haven't been resumed yet since. */ | |
3270 | ||
3271 | /* If scheduler locking applies, we can avoid iterating over all | |
3272 | threads. */ | |
08036331 | 3273 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3274 | { |
5b6d1e4f PA |
3275 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3276 | resume_ptid)) | |
08036331 | 3277 | { |
f3f8ece4 PA |
3278 | switch_to_thread_no_regs (tp); |
3279 | ||
4d9d9d04 PA |
3280 | /* Ignore the current thread here. It's handled |
3281 | afterwards. */ | |
08036331 | 3282 | if (tp == cur_thr) |
4d9d9d04 | 3283 | continue; |
c906108c | 3284 | |
4d9d9d04 PA |
3285 | if (!thread_still_needs_step_over (tp)) |
3286 | continue; | |
3287 | ||
3288 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3289 | |
1eb8556f SM |
3290 | infrun_debug_printf ("need to step-over [%s] first", |
3291 | target_pid_to_str (tp->ptid).c_str ()); | |
99619bea | 3292 | |
28d5518b | 3293 | global_thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3294 | } |
f3f8ece4 PA |
3295 | |
3296 | switch_to_thread (cur_thr); | |
30852783 UW |
3297 | } |
3298 | ||
4d9d9d04 PA |
3299 | /* Enqueue the current thread last, so that we move all other |
3300 | threads over their breakpoints first. */ | |
08036331 | 3301 | if (cur_thr->stepping_over_breakpoint) |
28d5518b | 3302 | global_thread_step_over_chain_enqueue (cur_thr); |
30852783 | 3303 | |
4d9d9d04 PA |
3304 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3305 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3306 | advanced. Must do this before resuming any thread, as in | |
3307 | all-stop/remote, once we resume we can't send any other packet | |
3308 | until the target stops again. */ | |
fc75c28b | 3309 | cur_thr->prev_pc = regcache_read_pc_protected (regcache); |
99619bea | 3310 | |
a9bc57b9 | 3311 | { |
1192f124 | 3312 | scoped_disable_commit_resumed disable_commit_resumed ("proceeding"); |
85ad3aaf | 3313 | |
a9bc57b9 | 3314 | started = start_step_over (); |
c906108c | 3315 | |
a9bc57b9 TT |
3316 | if (step_over_info_valid_p ()) |
3317 | { | |
3318 | /* Either this thread started a new in-line step over, or some | |
3319 | other thread was already doing one. In either case, don't | |
3320 | resume anything else until the step-over is finished. */ | |
3321 | } | |
3322 | else if (started && !target_is_non_stop_p ()) | |
3323 | { | |
3324 | /* A new displaced stepping sequence was started. In all-stop, | |
3325 | we can't talk to the target anymore until it next stops. */ | |
3326 | } | |
3327 | else if (!non_stop && target_is_non_stop_p ()) | |
3328 | { | |
3ec3145c SM |
3329 | INFRUN_SCOPED_DEBUG_START_END |
3330 | ("resuming threads, all-stop-on-top-of-non-stop"); | |
3331 | ||
a9bc57b9 TT |
3332 | /* In all-stop, but the target is always in non-stop mode. |
3333 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3334 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3335 | resume_ptid)) | |
3336 | { | |
3337 | switch_to_thread_no_regs (tp); | |
3338 | ||
f9fac3c8 SM |
3339 | if (!tp->inf->has_execution ()) |
3340 | { | |
1eb8556f SM |
3341 | infrun_debug_printf ("[%s] target has no execution", |
3342 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3343 | continue; |
3344 | } | |
f3f8ece4 | 3345 | |
f9fac3c8 SM |
3346 | if (tp->resumed) |
3347 | { | |
1eb8556f SM |
3348 | infrun_debug_printf ("[%s] resumed", |
3349 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3350 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
3351 | continue; | |
3352 | } | |
fbea99ea | 3353 | |
f9fac3c8 SM |
3354 | if (thread_is_in_step_over_chain (tp)) |
3355 | { | |
1eb8556f SM |
3356 | infrun_debug_printf ("[%s] needs step-over", |
3357 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3358 | continue; |
3359 | } | |
fbea99ea | 3360 | |
8cc8b4da SM |
3361 | /* If a thread of that inferior is waiting for a vfork-done |
3362 | (for a detached vfork child to exec or exit), breakpoints are | |
3363 | removed. We must not resume any thread of that inferior, other | |
3364 | than the one waiting for the vfork-done. */ | |
3365 | if (tp->inf->thread_waiting_for_vfork_done != nullptr | |
3366 | && tp != tp->inf->thread_waiting_for_vfork_done) | |
3367 | { | |
3368 | infrun_debug_printf ("[%s] another thread of this inferior is " | |
3369 | "waiting for vfork-done", | |
3370 | tp->ptid.to_string ().c_str ()); | |
3371 | continue; | |
3372 | } | |
3373 | ||
1eb8556f | 3374 | infrun_debug_printf ("resuming %s", |
dda83cd7 | 3375 | target_pid_to_str (tp->ptid).c_str ()); |
fbea99ea | 3376 | |
f9fac3c8 SM |
3377 | reset_ecs (ecs, tp); |
3378 | switch_to_thread (tp); | |
3379 | keep_going_pass_signal (ecs); | |
3380 | if (!ecs->wait_some_more) | |
3381 | error (_("Command aborted.")); | |
3382 | } | |
a9bc57b9 | 3383 | } |
8cc8b4da SM |
3384 | else if (!cur_thr->resumed |
3385 | && !thread_is_in_step_over_chain (cur_thr) | |
3386 | /* In non-stop, forbid resume a thread if some other thread of | |
3387 | that inferior is waiting for a vfork-done event (this means | |
3388 | breakpoints are out for this inferior). */ | |
3389 | && !(non_stop && cur_thr->inf->thread_waiting_for_vfork_done)) | |
a9bc57b9 TT |
3390 | { |
3391 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3392 | reset_ecs (ecs, cur_thr); |
3393 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3394 | keep_going_pass_signal (ecs); |
3395 | if (!ecs->wait_some_more) | |
3396 | error (_("Command aborted.")); | |
3397 | } | |
c906108c | 3398 | |
1192f124 SM |
3399 | disable_commit_resumed.reset_and_commit (); |
3400 | } | |
85ad3aaf | 3401 | |
731f534f | 3402 | finish_state.release (); |
c906108c | 3403 | |
873657b9 PA |
3404 | /* If we've switched threads above, switch back to the previously |
3405 | current thread. We don't want the user to see a different | |
3406 | selected thread. */ | |
3407 | switch_to_thread (cur_thr); | |
3408 | ||
0b333c5e PA |
3409 | /* Tell the event loop to wait for it to stop. If the target |
3410 | supports asynchronous execution, it'll do this from within | |
3411 | target_resume. */ | |
362646f5 | 3412 | if (!target_can_async_p ()) |
0b333c5e | 3413 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3414 | } |
c906108c SS |
3415 | \f |
3416 | ||
3417 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3418 | |
c906108c | 3419 | void |
8621d6a9 | 3420 | start_remote (int from_tty) |
c906108c | 3421 | { |
5b6d1e4f PA |
3422 | inferior *inf = current_inferior (); |
3423 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3424 | |
1777feb0 | 3425 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3426 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3427 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3428 | nothing is returned (instead of just blocking). Because of this, |
3429 | targets expecting an immediate response need to, internally, set | |
3430 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3431 | timeout. */ |
6426a772 JM |
3432 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3433 | differentiate to its caller what the state of the target is after | |
3434 | the initial open has been performed. Here we're assuming that | |
3435 | the target has stopped. It should be possible to eventually have | |
3436 | target_open() return to the caller an indication that the target | |
3437 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3438 | for an async run. */ |
5b6d1e4f | 3439 | wait_for_inferior (inf); |
8621d6a9 DJ |
3440 | |
3441 | /* Now that the inferior has stopped, do any bookkeeping like | |
3442 | loading shared libraries. We want to do this before normal_stop, | |
3443 | so that the displayed frame is up to date. */ | |
a7aba266 | 3444 | post_create_inferior (from_tty); |
8621d6a9 | 3445 | |
6426a772 | 3446 | normal_stop (); |
c906108c SS |
3447 | } |
3448 | ||
3449 | /* Initialize static vars when a new inferior begins. */ | |
3450 | ||
3451 | void | |
96baa820 | 3452 | init_wait_for_inferior (void) |
c906108c SS |
3453 | { |
3454 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3455 | |
c906108c SS |
3456 | breakpoint_init_inferior (inf_starting); |
3457 | ||
70509625 | 3458 | clear_proceed_status (0); |
9f976b41 | 3459 | |
ab1ddbcf | 3460 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3461 | |
842951eb | 3462 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3463 | } |
237fc4c9 | 3464 | |
c906108c | 3465 | \f |
488f131b | 3466 | |
ec9499be | 3467 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3468 | |
568d6575 UW |
3469 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3470 | struct execution_control_state *ecs); | |
3471 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3472 | struct execution_control_state *ecs); | |
4f5d7f63 | 3473 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3474 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3475 | struct frame_info *); |
611c83ae | 3476 | |
bdc36728 | 3477 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3478 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3479 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3480 | static void process_event_stop_test (struct execution_control_state *ecs); |
c4464ade | 3481 | static bool switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3482 | |
252fbfc8 PA |
3483 | /* This function is attached as a "thread_stop_requested" observer. |
3484 | Cleanup local state that assumed the PTID was to be resumed, and | |
3485 | report the stop to the frontend. */ | |
3486 | ||
2c0b251b | 3487 | static void |
252fbfc8 PA |
3488 | infrun_thread_stop_requested (ptid_t ptid) |
3489 | { | |
5b6d1e4f PA |
3490 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3491 | ||
c65d6b55 PA |
3492 | /* PTID was requested to stop. If the thread was already stopped, |
3493 | but the user/frontend doesn't know about that yet (e.g., the | |
3494 | thread had been temporarily paused for some step-over), set up | |
3495 | for reporting the stop now. */ | |
5b6d1e4f | 3496 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3497 | { |
3498 | if (tp->state != THREAD_RUNNING) | |
3499 | continue; | |
3500 | if (tp->executing) | |
3501 | continue; | |
c65d6b55 | 3502 | |
08036331 PA |
3503 | /* Remove matching threads from the step-over queue, so |
3504 | start_step_over doesn't try to resume them | |
3505 | automatically. */ | |
3506 | if (thread_is_in_step_over_chain (tp)) | |
28d5518b | 3507 | global_thread_step_over_chain_remove (tp); |
c65d6b55 | 3508 | |
08036331 PA |
3509 | /* If the thread is stopped, but the user/frontend doesn't |
3510 | know about that yet, queue a pending event, as if the | |
3511 | thread had just stopped now. Unless the thread already had | |
3512 | a pending event. */ | |
3513 | if (!tp->suspend.waitstatus_pending_p) | |
3514 | { | |
3515 | tp->suspend.waitstatus_pending_p = 1; | |
3516 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3517 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3518 | } | |
c65d6b55 | 3519 | |
08036331 PA |
3520 | /* Clear the inline-frame state, since we're re-processing the |
3521 | stop. */ | |
5b6d1e4f | 3522 | clear_inline_frame_state (tp); |
c65d6b55 | 3523 | |
08036331 PA |
3524 | /* If this thread was paused because some other thread was |
3525 | doing an inline-step over, let that finish first. Once | |
3526 | that happens, we'll restart all threads and consume pending | |
3527 | stop events then. */ | |
3528 | if (step_over_info_valid_p ()) | |
3529 | continue; | |
3530 | ||
3531 | /* Otherwise we can process the (new) pending event now. Set | |
3532 | it so this pending event is considered by | |
3533 | do_target_wait. */ | |
719546c4 | 3534 | tp->resumed = true; |
08036331 | 3535 | } |
252fbfc8 PA |
3536 | } |
3537 | ||
a07daef3 PA |
3538 | static void |
3539 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3540 | { | |
5b6d1e4f PA |
3541 | if (target_last_proc_target == tp->inf->process_target () |
3542 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3543 | nullify_last_target_wait_ptid (); |
3544 | } | |
3545 | ||
0cbcdb96 PA |
3546 | /* Delete the step resume, single-step and longjmp/exception resume |
3547 | breakpoints of TP. */ | |
4e1c45ea | 3548 | |
0cbcdb96 PA |
3549 | static void |
3550 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3551 | { |
0cbcdb96 PA |
3552 | delete_step_resume_breakpoint (tp); |
3553 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3554 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3555 | } |
3556 | ||
0cbcdb96 PA |
3557 | /* If the target still has execution, call FUNC for each thread that |
3558 | just stopped. In all-stop, that's all the non-exited threads; in | |
3559 | non-stop, that's the current thread, only. */ | |
3560 | ||
3561 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3562 | (struct thread_info *tp); | |
4e1c45ea PA |
3563 | |
3564 | static void | |
0cbcdb96 | 3565 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3566 | { |
55f6301a | 3567 | if (!target_has_execution () || inferior_ptid == null_ptid) |
4e1c45ea PA |
3568 | return; |
3569 | ||
fbea99ea | 3570 | if (target_is_non_stop_p ()) |
4e1c45ea | 3571 | { |
0cbcdb96 PA |
3572 | /* If in non-stop mode, only the current thread stopped. */ |
3573 | func (inferior_thread ()); | |
4e1c45ea PA |
3574 | } |
3575 | else | |
0cbcdb96 | 3576 | { |
0cbcdb96 | 3577 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3578 | for (thread_info *tp : all_non_exited_threads ()) |
3579 | func (tp); | |
0cbcdb96 PA |
3580 | } |
3581 | } | |
3582 | ||
3583 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3584 | the threads that just stopped. */ | |
3585 | ||
3586 | static void | |
3587 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3588 | { | |
3589 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3590 | } |
3591 | ||
3592 | /* Delete the single-step breakpoints of the threads that just | |
3593 | stopped. */ | |
7c16b83e | 3594 | |
34b7e8a6 PA |
3595 | static void |
3596 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3597 | { | |
3598 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3599 | } |
3600 | ||
221e1a37 | 3601 | /* See infrun.h. */ |
223698f8 | 3602 | |
221e1a37 | 3603 | void |
223698f8 DE |
3604 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3605 | const struct target_waitstatus *ws) | |
3606 | { | |
e71daf80 SM |
3607 | infrun_debug_printf ("target_wait (%d.%ld.%ld [%s], status) =", |
3608 | waiton_ptid.pid (), | |
3609 | waiton_ptid.lwp (), | |
3610 | waiton_ptid.tid (), | |
3611 | target_pid_to_str (waiton_ptid).c_str ()); | |
3612 | infrun_debug_printf (" %d.%ld.%ld [%s],", | |
3613 | result_ptid.pid (), | |
3614 | result_ptid.lwp (), | |
3615 | result_ptid.tid (), | |
3616 | target_pid_to_str (result_ptid).c_str ()); | |
3617 | infrun_debug_printf (" %s", target_waitstatus_to_string (ws).c_str ()); | |
223698f8 DE |
3618 | } |
3619 | ||
372316f1 PA |
3620 | /* Select a thread at random, out of those which are resumed and have |
3621 | had events. */ | |
3622 | ||
3623 | static struct thread_info * | |
5b6d1e4f | 3624 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3625 | { |
372316f1 | 3626 | int num_events = 0; |
08036331 | 3627 | |
5b6d1e4f | 3628 | auto has_event = [&] (thread_info *tp) |
08036331 | 3629 | { |
5b6d1e4f PA |
3630 | return (tp->ptid.matches (waiton_ptid) |
3631 | && tp->resumed | |
08036331 PA |
3632 | && tp->suspend.waitstatus_pending_p); |
3633 | }; | |
372316f1 PA |
3634 | |
3635 | /* First see how many events we have. Count only resumed threads | |
3636 | that have an event pending. */ | |
5b6d1e4f | 3637 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3638 | if (has_event (tp)) |
372316f1 PA |
3639 | num_events++; |
3640 | ||
3641 | if (num_events == 0) | |
3642 | return NULL; | |
3643 | ||
3644 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3645 | int random_selector = (int) ((num_events * (double) rand ()) |
3646 | / (RAND_MAX + 1.0)); | |
372316f1 | 3647 | |
1eb8556f SM |
3648 | if (num_events > 1) |
3649 | infrun_debug_printf ("Found %d events, selecting #%d", | |
3650 | num_events, random_selector); | |
372316f1 PA |
3651 | |
3652 | /* Select the Nth thread that has had an event. */ | |
5b6d1e4f | 3653 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3654 | if (has_event (tp)) |
372316f1 | 3655 | if (random_selector-- == 0) |
08036331 | 3656 | return tp; |
372316f1 | 3657 | |
08036331 | 3658 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3659 | } |
3660 | ||
3661 | /* Wrapper for target_wait that first checks whether threads have | |
3662 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3663 | more events. INF is the inferior we're using to call target_wait |
3664 | on. */ | |
372316f1 PA |
3665 | |
3666 | static ptid_t | |
5b6d1e4f | 3667 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
b60cea74 | 3668 | target_waitstatus *status, target_wait_flags options) |
372316f1 PA |
3669 | { |
3670 | ptid_t event_ptid; | |
3671 | struct thread_info *tp; | |
3672 | ||
24ed6739 AB |
3673 | /* We know that we are looking for an event in the target of inferior |
3674 | INF, but we don't know which thread the event might come from. As | |
3675 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3676 | the wait code relies on it - doing so is always a mistake. */ | |
3677 | switch_to_inferior_no_thread (inf); | |
3678 | ||
372316f1 PA |
3679 | /* First check if there is a resumed thread with a wait status |
3680 | pending. */ | |
d7e15655 | 3681 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3682 | { |
5b6d1e4f | 3683 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3684 | } |
3685 | else | |
3686 | { | |
1eb8556f SM |
3687 | infrun_debug_printf ("Waiting for specific thread %s.", |
3688 | target_pid_to_str (ptid).c_str ()); | |
372316f1 PA |
3689 | |
3690 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3691 | tp = find_thread_ptid (inf, ptid); |
372316f1 PA |
3692 | gdb_assert (tp != NULL); |
3693 | if (!tp->suspend.waitstatus_pending_p) | |
3694 | tp = NULL; | |
3695 | } | |
3696 | ||
3697 | if (tp != NULL | |
3698 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3699 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3700 | { | |
00431a78 | 3701 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3702 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3703 | CORE_ADDR pc; |
3704 | int discard = 0; | |
3705 | ||
3706 | pc = regcache_read_pc (regcache); | |
3707 | ||
3708 | if (pc != tp->suspend.stop_pc) | |
3709 | { | |
1eb8556f SM |
3710 | infrun_debug_printf ("PC of %s changed. was=%s, now=%s", |
3711 | target_pid_to_str (tp->ptid).c_str (), | |
3712 | paddress (gdbarch, tp->suspend.stop_pc), | |
3713 | paddress (gdbarch, pc)); | |
372316f1 PA |
3714 | discard = 1; |
3715 | } | |
a01bda52 | 3716 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 | 3717 | { |
1eb8556f SM |
3718 | infrun_debug_printf ("previous breakpoint of %s, at %s gone", |
3719 | target_pid_to_str (tp->ptid).c_str (), | |
3720 | paddress (gdbarch, pc)); | |
372316f1 PA |
3721 | |
3722 | discard = 1; | |
3723 | } | |
3724 | ||
3725 | if (discard) | |
3726 | { | |
1eb8556f SM |
3727 | infrun_debug_printf ("pending event of %s cancelled.", |
3728 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3729 | |
3730 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3731 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3732 | } | |
3733 | } | |
3734 | ||
3735 | if (tp != NULL) | |
3736 | { | |
1eb8556f SM |
3737 | infrun_debug_printf ("Using pending wait status %s for %s.", |
3738 | target_waitstatus_to_string | |
3739 | (&tp->suspend.waitstatus).c_str (), | |
3740 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3741 | |
3742 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3743 | if it was a software breakpoint (and the target doesn't | |
3744 | always adjust the PC itself). */ | |
3745 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3746 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3747 | { | |
3748 | struct regcache *regcache; | |
3749 | struct gdbarch *gdbarch; | |
3750 | int decr_pc; | |
3751 | ||
00431a78 | 3752 | regcache = get_thread_regcache (tp); |
ac7936df | 3753 | gdbarch = regcache->arch (); |
372316f1 PA |
3754 | |
3755 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3756 | if (decr_pc != 0) | |
3757 | { | |
3758 | CORE_ADDR pc; | |
3759 | ||
3760 | pc = regcache_read_pc (regcache); | |
3761 | regcache_write_pc (regcache, pc + decr_pc); | |
3762 | } | |
3763 | } | |
3764 | ||
3765 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3766 | *status = tp->suspend.waitstatus; | |
3767 | tp->suspend.waitstatus_pending_p = 0; | |
3768 | ||
3769 | /* Wake up the event loop again, until all pending events are | |
3770 | processed. */ | |
3771 | if (target_is_async_p ()) | |
3772 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3773 | return tp->ptid; | |
3774 | } | |
3775 | ||
3776 | /* But if we don't find one, we'll have to wait. */ | |
3777 | ||
d3a07122 SM |
3778 | /* We can't ask a non-async target to do a non-blocking wait, so this will be |
3779 | a blocking wait. */ | |
3780 | if (!target_can_async_p ()) | |
3781 | options &= ~TARGET_WNOHANG; | |
3782 | ||
372316f1 PA |
3783 | if (deprecated_target_wait_hook) |
3784 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3785 | else | |
3786 | event_ptid = target_wait (ptid, status, options); | |
3787 | ||
3788 | return event_ptid; | |
3789 | } | |
3790 | ||
5b6d1e4f PA |
3791 | /* Wrapper for target_wait that first checks whether threads have |
3792 | pending statuses to report before actually asking the target for | |
b3e3a4c1 | 3793 | more events. Polls for events from all inferiors/targets. */ |
5b6d1e4f PA |
3794 | |
3795 | static bool | |
ac0d67ed | 3796 | do_target_wait (execution_control_state *ecs, target_wait_flags options) |
5b6d1e4f PA |
3797 | { |
3798 | int num_inferiors = 0; | |
3799 | int random_selector; | |
3800 | ||
b3e3a4c1 SM |
3801 | /* For fairness, we pick the first inferior/target to poll at random |
3802 | out of all inferiors that may report events, and then continue | |
3803 | polling the rest of the inferior list starting from that one in a | |
3804 | circular fashion until the whole list is polled once. */ | |
5b6d1e4f | 3805 | |
ac0d67ed | 3806 | auto inferior_matches = [] (inferior *inf) |
5b6d1e4f | 3807 | { |
ac0d67ed | 3808 | return inf->process_target () != nullptr; |
5b6d1e4f PA |
3809 | }; |
3810 | ||
b3e3a4c1 | 3811 | /* First see how many matching inferiors we have. */ |
5b6d1e4f PA |
3812 | for (inferior *inf : all_inferiors ()) |
3813 | if (inferior_matches (inf)) | |
3814 | num_inferiors++; | |
3815 | ||
3816 | if (num_inferiors == 0) | |
3817 | { | |
3818 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3819 | return false; | |
3820 | } | |
3821 | ||
b3e3a4c1 | 3822 | /* Now randomly pick an inferior out of those that matched. */ |
5b6d1e4f PA |
3823 | random_selector = (int) |
3824 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3825 | ||
1eb8556f SM |
3826 | if (num_inferiors > 1) |
3827 | infrun_debug_printf ("Found %d inferiors, starting at #%d", | |
3828 | num_inferiors, random_selector); | |
5b6d1e4f | 3829 | |
b3e3a4c1 | 3830 | /* Select the Nth inferior that matched. */ |
5b6d1e4f PA |
3831 | |
3832 | inferior *selected = nullptr; | |
3833 | ||
3834 | for (inferior *inf : all_inferiors ()) | |
3835 | if (inferior_matches (inf)) | |
3836 | if (random_selector-- == 0) | |
3837 | { | |
3838 | selected = inf; | |
3839 | break; | |
3840 | } | |
3841 | ||
b3e3a4c1 | 3842 | /* Now poll for events out of each of the matching inferior's |
5b6d1e4f PA |
3843 | targets, starting from the selected one. */ |
3844 | ||
3845 | auto do_wait = [&] (inferior *inf) | |
3846 | { | |
ac0d67ed | 3847 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, options); |
5b6d1e4f PA |
3848 | ecs->target = inf->process_target (); |
3849 | return (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3850 | }; | |
3851 | ||
b3e3a4c1 SM |
3852 | /* Needed in 'all-stop + target-non-stop' mode, because we end up |
3853 | here spuriously after the target is all stopped and we've already | |
5b6d1e4f PA |
3854 | reported the stop to the user, polling for events. */ |
3855 | scoped_restore_current_thread restore_thread; | |
3856 | ||
3857 | int inf_num = selected->num; | |
3858 | for (inferior *inf = selected; inf != NULL; inf = inf->next) | |
3859 | if (inferior_matches (inf)) | |
3860 | if (do_wait (inf)) | |
3861 | return true; | |
3862 | ||
3863 | for (inferior *inf = inferior_list; | |
3864 | inf != NULL && inf->num < inf_num; | |
3865 | inf = inf->next) | |
3866 | if (inferior_matches (inf)) | |
3867 | if (do_wait (inf)) | |
3868 | return true; | |
3869 | ||
3870 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3871 | return false; | |
3872 | } | |
3873 | ||
8ff53139 PA |
3874 | /* An event reported by wait_one. */ |
3875 | ||
3876 | struct wait_one_event | |
3877 | { | |
3878 | /* The target the event came out of. */ | |
3879 | process_stratum_target *target; | |
3880 | ||
3881 | /* The PTID the event was for. */ | |
3882 | ptid_t ptid; | |
3883 | ||
3884 | /* The waitstatus. */ | |
3885 | target_waitstatus ws; | |
3886 | }; | |
3887 | ||
3888 | static bool handle_one (const wait_one_event &event); | |
3889 | ||
24291992 PA |
3890 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3891 | detaching while a thread is displaced stepping is a recipe for | |
3892 | crashing it, as nothing would readjust the PC out of the scratch | |
3893 | pad. */ | |
3894 | ||
3895 | void | |
3896 | prepare_for_detach (void) | |
3897 | { | |
3898 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3899 | ptid_t pid_ptid = ptid_t (inf->pid); |
8ff53139 | 3900 | scoped_restore_current_thread restore_thread; |
24291992 | 3901 | |
9bcb1f16 | 3902 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3903 | |
8ff53139 PA |
3904 | /* Remove all threads of INF from the global step-over chain. We |
3905 | want to stop any ongoing step-over, not start any new one. */ | |
3906 | thread_info *next; | |
3907 | for (thread_info *tp = global_thread_step_over_chain_head; | |
3908 | tp != nullptr; | |
3909 | tp = next) | |
24291992 | 3910 | { |
8ff53139 PA |
3911 | next = global_thread_step_over_chain_next (tp); |
3912 | if (tp->inf == inf) | |
3913 | global_thread_step_over_chain_remove (tp); | |
3914 | } | |
24291992 | 3915 | |
ac7d717c PA |
3916 | /* If we were already in the middle of an inline step-over, and the |
3917 | thread stepping belongs to the inferior we're detaching, we need | |
3918 | to restart the threads of other inferiors. */ | |
3919 | if (step_over_info.thread != -1) | |
3920 | { | |
3921 | infrun_debug_printf ("inline step-over in-process while detaching"); | |
3922 | ||
3923 | thread_info *thr = find_thread_global_id (step_over_info.thread); | |
3924 | if (thr->inf == inf) | |
3925 | { | |
3926 | /* Since we removed threads of INF from the step-over chain, | |
3927 | we know this won't start a step-over for INF. */ | |
3928 | clear_step_over_info (); | |
3929 | ||
3930 | if (target_is_non_stop_p ()) | |
3931 | { | |
3932 | /* Start a new step-over in another thread if there's | |
3933 | one that needs it. */ | |
3934 | start_step_over (); | |
3935 | ||
3936 | /* Restart all other threads (except the | |
3937 | previously-stepping thread, since that one is still | |
3938 | running). */ | |
3939 | if (!step_over_info_valid_p ()) | |
3940 | restart_threads (thr); | |
3941 | } | |
3942 | } | |
3943 | } | |
3944 | ||
8ff53139 PA |
3945 | if (displaced_step_in_progress (inf)) |
3946 | { | |
3947 | infrun_debug_printf ("displaced-stepping in-process while detaching"); | |
24291992 | 3948 | |
8ff53139 | 3949 | /* Stop threads currently displaced stepping, aborting it. */ |
24291992 | 3950 | |
8ff53139 PA |
3951 | for (thread_info *thr : inf->non_exited_threads ()) |
3952 | { | |
3953 | if (thr->displaced_step_state.in_progress ()) | |
3954 | { | |
3955 | if (thr->executing) | |
3956 | { | |
3957 | if (!thr->stop_requested) | |
3958 | { | |
3959 | target_stop (thr->ptid); | |
3960 | thr->stop_requested = true; | |
3961 | } | |
3962 | } | |
3963 | else | |
3964 | thr->resumed = false; | |
3965 | } | |
3966 | } | |
24291992 | 3967 | |
8ff53139 PA |
3968 | while (displaced_step_in_progress (inf)) |
3969 | { | |
3970 | wait_one_event event; | |
24291992 | 3971 | |
8ff53139 PA |
3972 | event.target = inf->process_target (); |
3973 | event.ptid = do_target_wait_1 (inf, pid_ptid, &event.ws, 0); | |
24291992 | 3974 | |
8ff53139 PA |
3975 | if (debug_infrun) |
3976 | print_target_wait_results (pid_ptid, event.ptid, &event.ws); | |
24291992 | 3977 | |
8ff53139 PA |
3978 | handle_one (event); |
3979 | } | |
24291992 | 3980 | |
8ff53139 PA |
3981 | /* It's OK to leave some of the threads of INF stopped, since |
3982 | they'll be detached shortly. */ | |
24291992 | 3983 | } |
24291992 PA |
3984 | } |
3985 | ||
cd0fc7c3 | 3986 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3987 | |
cd0fc7c3 SS |
3988 | If inferior gets a signal, we may decide to start it up again |
3989 | instead of returning. That is why there is a loop in this function. | |
3990 | When this function actually returns it means the inferior | |
3991 | should be left stopped and GDB should read more commands. */ | |
3992 | ||
5b6d1e4f PA |
3993 | static void |
3994 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3995 | { |
1eb8556f | 3996 | infrun_debug_printf ("wait_for_inferior ()"); |
527159b7 | 3997 | |
4c41382a | 3998 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3999 | |
e6f5c25b PA |
4000 | /* If an error happens while handling the event, propagate GDB's |
4001 | knowledge of the executing state to the frontend/user running | |
4002 | state. */ | |
5b6d1e4f PA |
4003 | scoped_finish_thread_state finish_state |
4004 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 4005 | |
c906108c SS |
4006 | while (1) |
4007 | { | |
ae25568b PA |
4008 | struct execution_control_state ecss; |
4009 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 4010 | |
ae25568b PA |
4011 | memset (ecs, 0, sizeof (*ecs)); |
4012 | ||
ec9499be | 4013 | overlay_cache_invalid = 1; |
ec9499be | 4014 | |
f15cb84a YQ |
4015 | /* Flush target cache before starting to handle each event. |
4016 | Target was running and cache could be stale. This is just a | |
4017 | heuristic. Running threads may modify target memory, but we | |
4018 | don't get any event. */ | |
4019 | target_dcache_invalidate (); | |
4020 | ||
5b6d1e4f PA |
4021 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
4022 | ecs->target = inf->process_target (); | |
c906108c | 4023 | |
f00150c9 | 4024 | if (debug_infrun) |
5b6d1e4f | 4025 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 4026 | |
cd0fc7c3 SS |
4027 | /* Now figure out what to do with the result of the result. */ |
4028 | handle_inferior_event (ecs); | |
c906108c | 4029 | |
cd0fc7c3 SS |
4030 | if (!ecs->wait_some_more) |
4031 | break; | |
4032 | } | |
4e1c45ea | 4033 | |
e6f5c25b | 4034 | /* No error, don't finish the state yet. */ |
731f534f | 4035 | finish_state.release (); |
cd0fc7c3 | 4036 | } |
c906108c | 4037 | |
d3d4baed PA |
4038 | /* Cleanup that reinstalls the readline callback handler, if the |
4039 | target is running in the background. If while handling the target | |
4040 | event something triggered a secondary prompt, like e.g., a | |
4041 | pagination prompt, we'll have removed the callback handler (see | |
4042 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
4043 | event loop, ready to process further input. Note this has no | |
4044 | effect if the handler hasn't actually been removed, because calling | |
4045 | rl_callback_handler_install resets the line buffer, thus losing | |
4046 | input. */ | |
4047 | ||
4048 | static void | |
d238133d | 4049 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 4050 | { |
3b12939d PA |
4051 | struct ui *ui = current_ui; |
4052 | ||
4053 | if (!ui->async) | |
6c400b59 PA |
4054 | { |
4055 | /* We're not going back to the top level event loop yet. Don't | |
4056 | install the readline callback, as it'd prep the terminal, | |
4057 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
4058 | it the next time the prompt is displayed, when we're ready | |
4059 | for input. */ | |
4060 | return; | |
4061 | } | |
4062 | ||
3b12939d | 4063 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
4064 | gdb_rl_callback_handler_reinstall (); |
4065 | } | |
4066 | ||
243a9253 PA |
4067 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
4068 | that's just the event thread. In all-stop, that's all threads. */ | |
4069 | ||
4070 | static void | |
4071 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
4072 | { | |
08036331 PA |
4073 | if (ecs->event_thread != NULL |
4074 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 4075 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
4076 | |
4077 | if (!non_stop) | |
4078 | { | |
08036331 | 4079 | for (thread_info *thr : all_non_exited_threads ()) |
dda83cd7 | 4080 | { |
243a9253 PA |
4081 | if (thr->thread_fsm == NULL) |
4082 | continue; | |
4083 | if (thr == ecs->event_thread) | |
4084 | continue; | |
4085 | ||
00431a78 | 4086 | switch_to_thread (thr); |
46e3ed7f | 4087 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
4088 | } |
4089 | ||
4090 | if (ecs->event_thread != NULL) | |
00431a78 | 4091 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
4092 | } |
4093 | } | |
4094 | ||
3b12939d PA |
4095 | /* Helper for all_uis_check_sync_execution_done that works on the |
4096 | current UI. */ | |
4097 | ||
4098 | static void | |
4099 | check_curr_ui_sync_execution_done (void) | |
4100 | { | |
4101 | struct ui *ui = current_ui; | |
4102 | ||
4103 | if (ui->prompt_state == PROMPT_NEEDED | |
4104 | && ui->async | |
4105 | && !gdb_in_secondary_prompt_p (ui)) | |
4106 | { | |
223ffa71 | 4107 | target_terminal::ours (); |
76727919 | 4108 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 4109 | ui_register_input_event_handler (ui); |
3b12939d PA |
4110 | } |
4111 | } | |
4112 | ||
4113 | /* See infrun.h. */ | |
4114 | ||
4115 | void | |
4116 | all_uis_check_sync_execution_done (void) | |
4117 | { | |
0e454242 | 4118 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
4119 | { |
4120 | check_curr_ui_sync_execution_done (); | |
4121 | } | |
4122 | } | |
4123 | ||
a8836c93 PA |
4124 | /* See infrun.h. */ |
4125 | ||
4126 | void | |
4127 | all_uis_on_sync_execution_starting (void) | |
4128 | { | |
0e454242 | 4129 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
4130 | { |
4131 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
4132 | async_disable_stdin (); | |
4133 | } | |
4134 | } | |
4135 | ||
1777feb0 | 4136 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 4137 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
4138 | descriptor corresponding to the target. It can be called more than |
4139 | once to complete a single execution command. In such cases we need | |
4140 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
4141 | that this function is called for a single execution command, then |
4142 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 4143 | necessary cleanups. */ |
43ff13b4 JM |
4144 | |
4145 | void | |
b1a35af2 | 4146 | fetch_inferior_event () |
43ff13b4 | 4147 | { |
3ec3145c SM |
4148 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
4149 | ||
0d1e5fa7 | 4150 | struct execution_control_state ecss; |
a474d7c2 | 4151 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 4152 | int cmd_done = 0; |
43ff13b4 | 4153 | |
0d1e5fa7 PA |
4154 | memset (ecs, 0, sizeof (*ecs)); |
4155 | ||
c61db772 PA |
4156 | /* Events are always processed with the main UI as current UI. This |
4157 | way, warnings, debug output, etc. are always consistently sent to | |
4158 | the main console. */ | |
4b6749b9 | 4159 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 4160 | |
b78b3a29 TBA |
4161 | /* Temporarily disable pagination. Otherwise, the user would be |
4162 | given an option to press 'q' to quit, which would cause an early | |
4163 | exit and could leave GDB in a half-baked state. */ | |
4164 | scoped_restore save_pagination | |
4165 | = make_scoped_restore (&pagination_enabled, false); | |
4166 | ||
d3d4baed | 4167 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
4168 | { |
4169 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
4170 | ||
4171 | /* We're handling a live event, so make sure we're doing live | |
4172 | debugging. If we're looking at traceframes while the target is | |
4173 | running, we're going to need to get back to that mode after | |
4174 | handling the event. */ | |
4175 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
4176 | if (non_stop) | |
4177 | { | |
4178 | maybe_restore_traceframe.emplace (); | |
4179 | set_current_traceframe (-1); | |
4180 | } | |
43ff13b4 | 4181 | |
873657b9 PA |
4182 | /* The user/frontend should not notice a thread switch due to |
4183 | internal events. Make sure we revert to the user selected | |
4184 | thread and frame after handling the event and running any | |
4185 | breakpoint commands. */ | |
4186 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
4187 | |
4188 | overlay_cache_invalid = 1; | |
4189 | /* Flush target cache before starting to handle each event. Target | |
4190 | was running and cache could be stale. This is just a heuristic. | |
4191 | Running threads may modify target memory, but we don't get any | |
4192 | event. */ | |
4193 | target_dcache_invalidate (); | |
4194 | ||
4195 | scoped_restore save_exec_dir | |
4196 | = make_scoped_restore (&execution_direction, | |
4197 | target_execution_direction ()); | |
4198 | ||
1192f124 SM |
4199 | /* Allow targets to pause their resumed threads while we handle |
4200 | the event. */ | |
4201 | scoped_disable_commit_resumed disable_commit_resumed ("handling event"); | |
4202 | ||
ac0d67ed | 4203 | if (!do_target_wait (ecs, TARGET_WNOHANG)) |
1192f124 SM |
4204 | { |
4205 | infrun_debug_printf ("do_target_wait returned no event"); | |
4206 | disable_commit_resumed.reset_and_commit (); | |
4207 | return; | |
4208 | } | |
5b6d1e4f PA |
4209 | |
4210 | gdb_assert (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
4211 | ||
4212 | /* Switch to the target that generated the event, so we can do | |
7f08fd51 TBA |
4213 | target calls. */ |
4214 | switch_to_target_no_thread (ecs->target); | |
d238133d TT |
4215 | |
4216 | if (debug_infrun) | |
5b6d1e4f | 4217 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
d238133d TT |
4218 | |
4219 | /* If an error happens while handling the event, propagate GDB's | |
4220 | knowledge of the executing state to the frontend/user running | |
4221 | state. */ | |
4222 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 4223 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 4224 | |
979a0d13 | 4225 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
4226 | still for the thread which has thrown the exception. */ |
4227 | auto defer_bpstat_clear | |
4228 | = make_scope_exit (bpstat_clear_actions); | |
4229 | auto defer_delete_threads | |
4230 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
4231 | ||
4232 | /* Now figure out what to do with the result of the result. */ | |
4233 | handle_inferior_event (ecs); | |
4234 | ||
4235 | if (!ecs->wait_some_more) | |
4236 | { | |
5b6d1e4f | 4237 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
758cb810 | 4238 | bool should_stop = true; |
d238133d | 4239 | struct thread_info *thr = ecs->event_thread; |
d6b48e9c | 4240 | |
d238133d | 4241 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 4242 | |
d238133d TT |
4243 | if (thr != NULL) |
4244 | { | |
4245 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 4246 | |
d238133d | 4247 | if (thread_fsm != NULL) |
46e3ed7f | 4248 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 4249 | } |
243a9253 | 4250 | |
d238133d TT |
4251 | if (!should_stop) |
4252 | { | |
4253 | keep_going (ecs); | |
4254 | } | |
4255 | else | |
4256 | { | |
46e3ed7f | 4257 | bool should_notify_stop = true; |
d238133d | 4258 | int proceeded = 0; |
1840d81a | 4259 | |
d238133d | 4260 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 4261 | |
d238133d | 4262 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 4263 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 4264 | |
d238133d TT |
4265 | if (should_notify_stop) |
4266 | { | |
4267 | /* We may not find an inferior if this was a process exit. */ | |
4268 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
4269 | proceeded = normal_stop (); | |
4270 | } | |
243a9253 | 4271 | |
d238133d TT |
4272 | if (!proceeded) |
4273 | { | |
b1a35af2 | 4274 | inferior_event_handler (INF_EXEC_COMPLETE); |
d238133d TT |
4275 | cmd_done = 1; |
4276 | } | |
873657b9 PA |
4277 | |
4278 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
4279 | previously selected thread is gone. We have two | |
4280 | choices - switch to no thread selected, or restore the | |
4281 | previously selected thread (now exited). We chose the | |
4282 | later, just because that's what GDB used to do. After | |
4283 | this, "info threads" says "The current thread <Thread | |
4284 | ID 2> has terminated." instead of "No thread | |
4285 | selected.". */ | |
4286 | if (!non_stop | |
4287 | && cmd_done | |
4288 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
4289 | restore_thread.dont_restore (); | |
d238133d TT |
4290 | } |
4291 | } | |
4f8d22e3 | 4292 | |
d238133d TT |
4293 | defer_delete_threads.release (); |
4294 | defer_bpstat_clear.release (); | |
29f49a6a | 4295 | |
d238133d TT |
4296 | /* No error, don't finish the thread states yet. */ |
4297 | finish_state.release (); | |
731f534f | 4298 | |
1192f124 SM |
4299 | disable_commit_resumed.reset_and_commit (); |
4300 | ||
d238133d TT |
4301 | /* This scope is used to ensure that readline callbacks are |
4302 | reinstalled here. */ | |
4303 | } | |
4f8d22e3 | 4304 | |
3b12939d PA |
4305 | /* If a UI was in sync execution mode, and now isn't, restore its |
4306 | prompt (a synchronous execution command has finished, and we're | |
4307 | ready for input). */ | |
4308 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4309 | |
4310 | if (cmd_done | |
0f641c01 | 4311 | && exec_done_display_p |
00431a78 PA |
4312 | && (inferior_ptid == null_ptid |
4313 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 4314 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
4315 | } |
4316 | ||
29734269 SM |
4317 | /* See infrun.h. */ |
4318 | ||
edb3359d | 4319 | void |
29734269 SM |
4320 | set_step_info (thread_info *tp, struct frame_info *frame, |
4321 | struct symtab_and_line sal) | |
edb3359d | 4322 | { |
29734269 SM |
4323 | /* This can be removed once this function no longer implicitly relies on the |
4324 | inferior_ptid value. */ | |
4325 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4326 | |
16c381f0 JK |
4327 | tp->control.step_frame_id = get_frame_id (frame); |
4328 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4329 | |
4330 | tp->current_symtab = sal.symtab; | |
4331 | tp->current_line = sal.line; | |
4332 | } | |
4333 | ||
0d1e5fa7 PA |
4334 | /* Clear context switchable stepping state. */ |
4335 | ||
4336 | void | |
4e1c45ea | 4337 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4338 | { |
7f5ef605 | 4339 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4340 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4341 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4342 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4343 | } |
4344 | ||
ab1ddbcf | 4345 | /* See infrun.h. */ |
c32c64b7 | 4346 | |
6efcd9a8 | 4347 | void |
5b6d1e4f PA |
4348 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
4349 | target_waitstatus status) | |
c32c64b7 | 4350 | { |
5b6d1e4f | 4351 | target_last_proc_target = target; |
c32c64b7 DE |
4352 | target_last_wait_ptid = ptid; |
4353 | target_last_waitstatus = status; | |
4354 | } | |
4355 | ||
ab1ddbcf | 4356 | /* See infrun.h. */ |
e02bc4cc DS |
4357 | |
4358 | void | |
5b6d1e4f PA |
4359 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4360 | target_waitstatus *status) | |
e02bc4cc | 4361 | { |
5b6d1e4f PA |
4362 | if (target != nullptr) |
4363 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4364 | if (ptid != nullptr) |
4365 | *ptid = target_last_wait_ptid; | |
4366 | if (status != nullptr) | |
4367 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4368 | } |
4369 | ||
ab1ddbcf PA |
4370 | /* See infrun.h. */ |
4371 | ||
ac264b3b MS |
4372 | void |
4373 | nullify_last_target_wait_ptid (void) | |
4374 | { | |
5b6d1e4f | 4375 | target_last_proc_target = nullptr; |
ac264b3b | 4376 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4377 | target_last_waitstatus = {}; |
ac264b3b MS |
4378 | } |
4379 | ||
dcf4fbde | 4380 | /* Switch thread contexts. */ |
dd80620e MS |
4381 | |
4382 | static void | |
00431a78 | 4383 | context_switch (execution_control_state *ecs) |
dd80620e | 4384 | { |
1eb8556f | 4385 | if (ecs->ptid != inferior_ptid |
5b6d1e4f PA |
4386 | && (inferior_ptid == null_ptid |
4387 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 | 4388 | { |
1eb8556f SM |
4389 | infrun_debug_printf ("Switching context from %s to %s", |
4390 | target_pid_to_str (inferior_ptid).c_str (), | |
4391 | target_pid_to_str (ecs->ptid).c_str ()); | |
fd48f117 DJ |
4392 | } |
4393 | ||
00431a78 | 4394 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4395 | } |
4396 | ||
d8dd4d5f PA |
4397 | /* If the target can't tell whether we've hit breakpoints |
4398 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4399 | check whether that could have been caused by a breakpoint. If so, | |
4400 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4401 | ||
4fa8626c | 4402 | static void |
d8dd4d5f PA |
4403 | adjust_pc_after_break (struct thread_info *thread, |
4404 | struct target_waitstatus *ws) | |
4fa8626c | 4405 | { |
24a73cce UW |
4406 | struct regcache *regcache; |
4407 | struct gdbarch *gdbarch; | |
118e6252 | 4408 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4409 | |
4fa8626c DJ |
4410 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4411 | we aren't, just return. | |
9709f61c DJ |
4412 | |
4413 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4414 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4415 | implemented by software breakpoints should be handled through the normal | |
4416 | breakpoint layer. | |
8fb3e588 | 4417 | |
4fa8626c DJ |
4418 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4419 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4420 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4421 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4422 | generates these signals at breakpoints (the code has been in GDB since at | |
4423 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4424 | |
e6cf7916 UW |
4425 | In earlier versions of GDB, a target with |
4426 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4427 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4428 | target with both of these set in GDB history, and it seems unlikely to be | |
4429 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4430 | |
d8dd4d5f | 4431 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4432 | return; |
4433 | ||
d8dd4d5f | 4434 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4435 | return; |
4436 | ||
4058b839 PA |
4437 | /* In reverse execution, when a breakpoint is hit, the instruction |
4438 | under it has already been de-executed. The reported PC always | |
4439 | points at the breakpoint address, so adjusting it further would | |
4440 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4441 | architecture: | |
4442 | ||
4443 | B1 0x08000000 : INSN1 | |
4444 | B2 0x08000001 : INSN2 | |
4445 | 0x08000002 : INSN3 | |
4446 | PC -> 0x08000003 : INSN4 | |
4447 | ||
4448 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4449 | from that point should hit B2 as below. Reading the PC when the | |
4450 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4451 | been de-executed already. | |
4452 | ||
4453 | B1 0x08000000 : INSN1 | |
4454 | B2 PC -> 0x08000001 : INSN2 | |
4455 | 0x08000002 : INSN3 | |
4456 | 0x08000003 : INSN4 | |
4457 | ||
4458 | We can't apply the same logic as for forward execution, because | |
4459 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4460 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4461 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4462 | behaviour. */ | |
4463 | if (execution_direction == EXEC_REVERSE) | |
4464 | return; | |
4465 | ||
1cf4d951 PA |
4466 | /* If the target can tell whether the thread hit a SW breakpoint, |
4467 | trust it. Targets that can tell also adjust the PC | |
4468 | themselves. */ | |
4469 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4470 | return; | |
4471 | ||
4472 | /* Note that relying on whether a breakpoint is planted in memory to | |
4473 | determine this can fail. E.g,. the breakpoint could have been | |
4474 | removed since. Or the thread could have been told to step an | |
4475 | instruction the size of a breakpoint instruction, and only | |
4476 | _after_ was a breakpoint inserted at its address. */ | |
4477 | ||
24a73cce UW |
4478 | /* If this target does not decrement the PC after breakpoints, then |
4479 | we have nothing to do. */ | |
00431a78 | 4480 | regcache = get_thread_regcache (thread); |
ac7936df | 4481 | gdbarch = regcache->arch (); |
118e6252 | 4482 | |
527a273a | 4483 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4484 | if (decr_pc == 0) |
24a73cce UW |
4485 | return; |
4486 | ||
8b86c959 | 4487 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4488 | |
8aad930b AC |
4489 | /* Find the location where (if we've hit a breakpoint) the |
4490 | breakpoint would be. */ | |
118e6252 | 4491 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4492 | |
1cf4d951 PA |
4493 | /* If the target can't tell whether a software breakpoint triggered, |
4494 | fallback to figuring it out based on breakpoints we think were | |
4495 | inserted in the target, and on whether the thread was stepped or | |
4496 | continued. */ | |
4497 | ||
1c5cfe86 PA |
4498 | /* Check whether there actually is a software breakpoint inserted at |
4499 | that location. | |
4500 | ||
4501 | If in non-stop mode, a race condition is possible where we've | |
4502 | removed a breakpoint, but stop events for that breakpoint were | |
4503 | already queued and arrive later. To suppress those spurious | |
4504 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4505 | and retire them after a number of stop events are reported. Note |
4506 | this is an heuristic and can thus get confused. The real fix is | |
4507 | to get the "stopped by SW BP and needs adjustment" info out of | |
4508 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4509 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4510 | || (target_is_non_stop_p () |
4511 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4512 | { |
07036511 | 4513 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4514 | |
8213266a | 4515 | if (record_full_is_used ()) |
07036511 TT |
4516 | restore_operation_disable.emplace |
4517 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4518 | |
1c0fdd0e UW |
4519 | /* When using hardware single-step, a SIGTRAP is reported for both |
4520 | a completed single-step and a software breakpoint. Need to | |
4521 | differentiate between the two, as the latter needs adjusting | |
4522 | but the former does not. | |
4523 | ||
4524 | The SIGTRAP can be due to a completed hardware single-step only if | |
4525 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4526 | - this thread is currently being stepped |
4527 | ||
4528 | If any of these events did not occur, we must have stopped due | |
4529 | to hitting a software breakpoint, and have to back up to the | |
4530 | breakpoint address. | |
4531 | ||
4532 | As a special case, we could have hardware single-stepped a | |
4533 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4534 | we also need to back up to the breakpoint address. */ | |
4535 | ||
d8dd4d5f PA |
4536 | if (thread_has_single_step_breakpoints_set (thread) |
4537 | || !currently_stepping (thread) | |
4538 | || (thread->stepped_breakpoint | |
4539 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4540 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4541 | } |
4fa8626c DJ |
4542 | } |
4543 | ||
c4464ade | 4544 | static bool |
edb3359d DJ |
4545 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) |
4546 | { | |
4547 | for (frame = get_prev_frame (frame); | |
4548 | frame != NULL; | |
4549 | frame = get_prev_frame (frame)) | |
4550 | { | |
4551 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
c4464ade SM |
4552 | return true; |
4553 | ||
edb3359d DJ |
4554 | if (get_frame_type (frame) != INLINE_FRAME) |
4555 | break; | |
4556 | } | |
4557 | ||
c4464ade | 4558 | return false; |
edb3359d DJ |
4559 | } |
4560 | ||
4a4c04f1 BE |
4561 | /* Look for an inline frame that is marked for skip. |
4562 | If PREV_FRAME is TRUE start at the previous frame, | |
4563 | otherwise start at the current frame. Stop at the | |
4564 | first non-inline frame, or at the frame where the | |
4565 | step started. */ | |
4566 | ||
4567 | static bool | |
4568 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4569 | { | |
4570 | struct frame_info *frame = get_current_frame (); | |
4571 | ||
4572 | if (prev_frame) | |
4573 | frame = get_prev_frame (frame); | |
4574 | ||
4575 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4576 | { | |
4577 | const char *fn = NULL; | |
4578 | symtab_and_line sal; | |
4579 | struct symbol *sym; | |
4580 | ||
4581 | if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id)) | |
4582 | break; | |
4583 | if (get_frame_type (frame) != INLINE_FRAME) | |
4584 | break; | |
4585 | ||
4586 | sal = find_frame_sal (frame); | |
4587 | sym = get_frame_function (frame); | |
4588 | ||
4589 | if (sym != NULL) | |
4590 | fn = sym->print_name (); | |
4591 | ||
4592 | if (sal.line != 0 | |
4593 | && function_name_is_marked_for_skip (fn, sal)) | |
4594 | return true; | |
4595 | } | |
4596 | ||
4597 | return false; | |
4598 | } | |
4599 | ||
c65d6b55 PA |
4600 | /* If the event thread has the stop requested flag set, pretend it |
4601 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4602 | target_stop). */ | |
4603 | ||
4604 | static bool | |
4605 | handle_stop_requested (struct execution_control_state *ecs) | |
4606 | { | |
4607 | if (ecs->event_thread->stop_requested) | |
4608 | { | |
4609 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4610 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4611 | handle_signal_stop (ecs); | |
4612 | return true; | |
4613 | } | |
4614 | return false; | |
4615 | } | |
4616 | ||
a96d9b2e | 4617 | /* Auxiliary function that handles syscall entry/return events. |
c4464ade SM |
4618 | It returns true if the inferior should keep going (and GDB |
4619 | should ignore the event), or false if the event deserves to be | |
a96d9b2e | 4620 | processed. */ |
ca2163eb | 4621 | |
c4464ade | 4622 | static bool |
ca2163eb | 4623 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4624 | { |
ca2163eb | 4625 | struct regcache *regcache; |
ca2163eb PA |
4626 | int syscall_number; |
4627 | ||
00431a78 | 4628 | context_switch (ecs); |
ca2163eb | 4629 | |
00431a78 | 4630 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4631 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4632 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4633 | |
a96d9b2e SDJ |
4634 | if (catch_syscall_enabled () > 0 |
4635 | && catching_syscall_number (syscall_number) > 0) | |
4636 | { | |
1eb8556f | 4637 | infrun_debug_printf ("syscall number=%d", syscall_number); |
a96d9b2e | 4638 | |
16c381f0 | 4639 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4640 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4641 | ecs->event_thread->suspend.stop_pc, |
4642 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4643 | |
c65d6b55 | 4644 | if (handle_stop_requested (ecs)) |
c4464ade | 4645 | return false; |
c65d6b55 | 4646 | |
ce12b012 | 4647 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4648 | { |
4649 | /* Catchpoint hit. */ | |
c4464ade | 4650 | return false; |
ca2163eb | 4651 | } |
a96d9b2e | 4652 | } |
ca2163eb | 4653 | |
c65d6b55 | 4654 | if (handle_stop_requested (ecs)) |
c4464ade | 4655 | return false; |
c65d6b55 | 4656 | |
ca2163eb | 4657 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb | 4658 | keep_going (ecs); |
c4464ade SM |
4659 | |
4660 | return true; | |
a96d9b2e SDJ |
4661 | } |
4662 | ||
7e324e48 GB |
4663 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4664 | ||
4665 | static void | |
4666 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4667 | struct execution_control_state *ecs) | |
4668 | { | |
4669 | if (!ecs->stop_func_filled_in) | |
4670 | { | |
98a617f8 | 4671 | const block *block; |
fe830662 | 4672 | const general_symbol_info *gsi; |
98a617f8 | 4673 | |
7e324e48 GB |
4674 | /* Don't care about return value; stop_func_start and stop_func_name |
4675 | will both be 0 if it doesn't work. */ | |
fe830662 TT |
4676 | find_pc_partial_function_sym (ecs->event_thread->suspend.stop_pc, |
4677 | &gsi, | |
4678 | &ecs->stop_func_start, | |
4679 | &ecs->stop_func_end, | |
4680 | &block); | |
4681 | ecs->stop_func_name = gsi == nullptr ? nullptr : gsi->print_name (); | |
98a617f8 KB |
4682 | |
4683 | /* The call to find_pc_partial_function, above, will set | |
4684 | stop_func_start and stop_func_end to the start and end | |
4685 | of the range containing the stop pc. If this range | |
4686 | contains the entry pc for the block (which is always the | |
4687 | case for contiguous blocks), advance stop_func_start past | |
4688 | the function's start offset and entrypoint. Note that | |
4689 | stop_func_start is NOT advanced when in a range of a | |
4690 | non-contiguous block that does not contain the entry pc. */ | |
4691 | if (block != nullptr | |
4692 | && ecs->stop_func_start <= BLOCK_ENTRY_PC (block) | |
4693 | && BLOCK_ENTRY_PC (block) < ecs->stop_func_end) | |
4694 | { | |
4695 | ecs->stop_func_start | |
4696 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4697 | ||
4698 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4699 | ecs->stop_func_start | |
4700 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4701 | } | |
591a12a1 | 4702 | |
7e324e48 GB |
4703 | ecs->stop_func_filled_in = 1; |
4704 | } | |
4705 | } | |
4706 | ||
4f5d7f63 | 4707 | |
00431a78 | 4708 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4709 | |
4710 | static enum stop_kind | |
00431a78 | 4711 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4712 | { |
5b6d1e4f | 4713 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4714 | |
4715 | gdb_assert (inf != NULL); | |
4716 | return inf->control.stop_soon; | |
4717 | } | |
4718 | ||
5b6d1e4f PA |
4719 | /* Poll for one event out of the current target. Store the resulting |
4720 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4721 | |
4722 | static ptid_t | |
5b6d1e4f | 4723 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4724 | { |
4725 | ptid_t event_ptid; | |
372316f1 PA |
4726 | |
4727 | overlay_cache_invalid = 1; | |
4728 | ||
4729 | /* Flush target cache before starting to handle each event. | |
4730 | Target was running and cache could be stale. This is just a | |
4731 | heuristic. Running threads may modify target memory, but we | |
4732 | don't get any event. */ | |
4733 | target_dcache_invalidate (); | |
4734 | ||
4735 | if (deprecated_target_wait_hook) | |
5b6d1e4f | 4736 | event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 | 4737 | else |
5b6d1e4f | 4738 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4739 | |
4740 | if (debug_infrun) | |
5b6d1e4f | 4741 | print_target_wait_results (minus_one_ptid, event_ptid, ws); |
372316f1 PA |
4742 | |
4743 | return event_ptid; | |
4744 | } | |
4745 | ||
5b6d1e4f PA |
4746 | /* Wait for one event out of any target. */ |
4747 | ||
4748 | static wait_one_event | |
4749 | wait_one () | |
4750 | { | |
4751 | while (1) | |
4752 | { | |
4753 | for (inferior *inf : all_inferiors ()) | |
4754 | { | |
4755 | process_stratum_target *target = inf->process_target (); | |
4756 | if (target == NULL | |
4757 | || !target->is_async_p () | |
4758 | || !target->threads_executing) | |
4759 | continue; | |
4760 | ||
4761 | switch_to_inferior_no_thread (inf); | |
4762 | ||
4763 | wait_one_event event; | |
4764 | event.target = target; | |
4765 | event.ptid = poll_one_curr_target (&event.ws); | |
4766 | ||
4767 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4768 | { | |
4769 | /* If nothing is resumed, remove the target from the | |
4770 | event loop. */ | |
4771 | target_async (0); | |
4772 | } | |
4773 | else if (event.ws.kind != TARGET_WAITKIND_IGNORE) | |
4774 | return event; | |
4775 | } | |
4776 | ||
4777 | /* Block waiting for some event. */ | |
4778 | ||
4779 | fd_set readfds; | |
4780 | int nfds = 0; | |
4781 | ||
4782 | FD_ZERO (&readfds); | |
4783 | ||
4784 | for (inferior *inf : all_inferiors ()) | |
4785 | { | |
4786 | process_stratum_target *target = inf->process_target (); | |
4787 | if (target == NULL | |
4788 | || !target->is_async_p () | |
4789 | || !target->threads_executing) | |
4790 | continue; | |
4791 | ||
4792 | int fd = target->async_wait_fd (); | |
4793 | FD_SET (fd, &readfds); | |
4794 | if (nfds <= fd) | |
4795 | nfds = fd + 1; | |
4796 | } | |
4797 | ||
4798 | if (nfds == 0) | |
4799 | { | |
4800 | /* No waitable targets left. All must be stopped. */ | |
4801 | return {NULL, minus_one_ptid, {TARGET_WAITKIND_NO_RESUMED}}; | |
4802 | } | |
4803 | ||
4804 | QUIT; | |
4805 | ||
4806 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4807 | if (numfds < 0) | |
4808 | { | |
4809 | if (errno == EINTR) | |
4810 | continue; | |
4811 | else | |
4812 | perror_with_name ("interruptible_select"); | |
4813 | } | |
4814 | } | |
4815 | } | |
4816 | ||
372316f1 PA |
4817 | /* Save the thread's event and stop reason to process it later. */ |
4818 | ||
4819 | static void | |
5b6d1e4f | 4820 | save_waitstatus (struct thread_info *tp, const target_waitstatus *ws) |
372316f1 | 4821 | { |
1eb8556f SM |
4822 | infrun_debug_printf ("saving status %s for %d.%ld.%ld", |
4823 | target_waitstatus_to_string (ws).c_str (), | |
4824 | tp->ptid.pid (), | |
4825 | tp->ptid.lwp (), | |
4826 | tp->ptid.tid ()); | |
372316f1 PA |
4827 | |
4828 | /* Record for later. */ | |
4829 | tp->suspend.waitstatus = *ws; | |
4830 | tp->suspend.waitstatus_pending_p = 1; | |
4831 | ||
372316f1 PA |
4832 | if (ws->kind == TARGET_WAITKIND_STOPPED |
4833 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4834 | { | |
89ba430c SM |
4835 | struct regcache *regcache = get_thread_regcache (tp); |
4836 | const address_space *aspace = regcache->aspace (); | |
372316f1 PA |
4837 | CORE_ADDR pc = regcache_read_pc (regcache); |
4838 | ||
4839 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4840 | ||
18493a00 PA |
4841 | scoped_restore_current_thread restore_thread; |
4842 | switch_to_thread (tp); | |
4843 | ||
4844 | if (target_stopped_by_watchpoint ()) | |
372316f1 PA |
4845 | { |
4846 | tp->suspend.stop_reason | |
4847 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4848 | } | |
4849 | else if (target_supports_stopped_by_sw_breakpoint () | |
18493a00 | 4850 | && target_stopped_by_sw_breakpoint ()) |
372316f1 PA |
4851 | { |
4852 | tp->suspend.stop_reason | |
4853 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4854 | } | |
4855 | else if (target_supports_stopped_by_hw_breakpoint () | |
18493a00 | 4856 | && target_stopped_by_hw_breakpoint ()) |
372316f1 PA |
4857 | { |
4858 | tp->suspend.stop_reason | |
4859 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4860 | } | |
4861 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4862 | && hardware_breakpoint_inserted_here_p (aspace, | |
4863 | pc)) | |
4864 | { | |
4865 | tp->suspend.stop_reason | |
4866 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4867 | } | |
4868 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4869 | && software_breakpoint_inserted_here_p (aspace, | |
4870 | pc)) | |
4871 | { | |
4872 | tp->suspend.stop_reason | |
4873 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4874 | } | |
4875 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4876 | && currently_stepping (tp)) | |
4877 | { | |
4878 | tp->suspend.stop_reason | |
4879 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4880 | } | |
4881 | } | |
4882 | } | |
4883 | ||
293b3ebc TBA |
4884 | /* Mark the non-executing threads accordingly. In all-stop, all |
4885 | threads of all processes are stopped when we get any event | |
4886 | reported. In non-stop mode, only the event thread stops. */ | |
4887 | ||
4888 | static void | |
4889 | mark_non_executing_threads (process_stratum_target *target, | |
4890 | ptid_t event_ptid, | |
4891 | struct target_waitstatus ws) | |
4892 | { | |
4893 | ptid_t mark_ptid; | |
4894 | ||
4895 | if (!target_is_non_stop_p ()) | |
4896 | mark_ptid = minus_one_ptid; | |
4897 | else if (ws.kind == TARGET_WAITKIND_SIGNALLED | |
4898 | || ws.kind == TARGET_WAITKIND_EXITED) | |
4899 | { | |
4900 | /* If we're handling a process exit in non-stop mode, even | |
4901 | though threads haven't been deleted yet, one would think | |
4902 | that there is nothing to do, as threads of the dead process | |
4903 | will be soon deleted, and threads of any other process were | |
4904 | left running. However, on some targets, threads survive a | |
4905 | process exit event. E.g., for the "checkpoint" command, | |
4906 | when the current checkpoint/fork exits, linux-fork.c | |
4907 | automatically switches to another fork from within | |
4908 | target_mourn_inferior, by associating the same | |
4909 | inferior/thread to another fork. We haven't mourned yet at | |
4910 | this point, but we must mark any threads left in the | |
4911 | process as not-executing so that finish_thread_state marks | |
4912 | them stopped (in the user's perspective) if/when we present | |
4913 | the stop to the user. */ | |
4914 | mark_ptid = ptid_t (event_ptid.pid ()); | |
4915 | } | |
4916 | else | |
4917 | mark_ptid = event_ptid; | |
4918 | ||
4919 | set_executing (target, mark_ptid, false); | |
4920 | ||
4921 | /* Likewise the resumed flag. */ | |
4922 | set_resumed (target, mark_ptid, false); | |
4923 | } | |
4924 | ||
d758e62c PA |
4925 | /* Handle one event after stopping threads. If the eventing thread |
4926 | reports back any interesting event, we leave it pending. If the | |
4927 | eventing thread was in the middle of a displaced step, we | |
8ff53139 PA |
4928 | cancel/finish it, and unless the thread's inferior is being |
4929 | detached, put the thread back in the step-over chain. Returns true | |
4930 | if there are no resumed threads left in the target (thus there's no | |
4931 | point in waiting further), false otherwise. */ | |
d758e62c PA |
4932 | |
4933 | static bool | |
4934 | handle_one (const wait_one_event &event) | |
4935 | { | |
4936 | infrun_debug_printf | |
4937 | ("%s %s", target_waitstatus_to_string (&event.ws).c_str (), | |
4938 | target_pid_to_str (event.ptid).c_str ()); | |
4939 | ||
4940 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4941 | { | |
4942 | /* All resumed threads exited. */ | |
4943 | return true; | |
4944 | } | |
4945 | else if (event.ws.kind == TARGET_WAITKIND_THREAD_EXITED | |
4946 | || event.ws.kind == TARGET_WAITKIND_EXITED | |
4947 | || event.ws.kind == TARGET_WAITKIND_SIGNALLED) | |
4948 | { | |
4949 | /* One thread/process exited/signalled. */ | |
4950 | ||
4951 | thread_info *t = nullptr; | |
4952 | ||
4953 | /* The target may have reported just a pid. If so, try | |
4954 | the first non-exited thread. */ | |
4955 | if (event.ptid.is_pid ()) | |
4956 | { | |
4957 | int pid = event.ptid.pid (); | |
4958 | inferior *inf = find_inferior_pid (event.target, pid); | |
4959 | for (thread_info *tp : inf->non_exited_threads ()) | |
4960 | { | |
4961 | t = tp; | |
4962 | break; | |
4963 | } | |
4964 | ||
4965 | /* If there is no available thread, the event would | |
4966 | have to be appended to a per-inferior event list, | |
4967 | which does not exist (and if it did, we'd have | |
4968 | to adjust run control command to be able to | |
4969 | resume such an inferior). We assert here instead | |
4970 | of going into an infinite loop. */ | |
4971 | gdb_assert (t != nullptr); | |
4972 | ||
4973 | infrun_debug_printf | |
4974 | ("using %s", target_pid_to_str (t->ptid).c_str ()); | |
4975 | } | |
4976 | else | |
4977 | { | |
4978 | t = find_thread_ptid (event.target, event.ptid); | |
4979 | /* Check if this is the first time we see this thread. | |
4980 | Don't bother adding if it individually exited. */ | |
4981 | if (t == nullptr | |
4982 | && event.ws.kind != TARGET_WAITKIND_THREAD_EXITED) | |
4983 | t = add_thread (event.target, event.ptid); | |
4984 | } | |
4985 | ||
4986 | if (t != nullptr) | |
4987 | { | |
4988 | /* Set the threads as non-executing to avoid | |
4989 | another stop attempt on them. */ | |
4990 | switch_to_thread_no_regs (t); | |
4991 | mark_non_executing_threads (event.target, event.ptid, | |
4992 | event.ws); | |
4993 | save_waitstatus (t, &event.ws); | |
4994 | t->stop_requested = false; | |
4995 | } | |
4996 | } | |
4997 | else | |
4998 | { | |
4999 | thread_info *t = find_thread_ptid (event.target, event.ptid); | |
5000 | if (t == NULL) | |
5001 | t = add_thread (event.target, event.ptid); | |
5002 | ||
5003 | t->stop_requested = 0; | |
5004 | t->executing = 0; | |
5005 | t->resumed = false; | |
5006 | t->control.may_range_step = 0; | |
5007 | ||
5008 | /* This may be the first time we see the inferior report | |
5009 | a stop. */ | |
5010 | inferior *inf = find_inferior_ptid (event.target, event.ptid); | |
5011 | if (inf->needs_setup) | |
5012 | { | |
5013 | switch_to_thread_no_regs (t); | |
5014 | setup_inferior (0); | |
5015 | } | |
5016 | ||
5017 | if (event.ws.kind == TARGET_WAITKIND_STOPPED | |
5018 | && event.ws.value.sig == GDB_SIGNAL_0) | |
5019 | { | |
5020 | /* We caught the event that we intended to catch, so | |
5021 | there's no event pending. */ | |
5022 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
5023 | t->suspend.waitstatus_pending_p = 0; | |
5024 | ||
5025 | if (displaced_step_finish (t, GDB_SIGNAL_0) | |
5026 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) | |
5027 | { | |
5028 | /* Add it back to the step-over queue. */ | |
5029 | infrun_debug_printf | |
5030 | ("displaced-step of %s canceled", | |
5031 | target_pid_to_str (t->ptid).c_str ()); | |
5032 | ||
5033 | t->control.trap_expected = 0; | |
8ff53139 PA |
5034 | if (!t->inf->detaching) |
5035 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
5036 | } |
5037 | } | |
5038 | else | |
5039 | { | |
5040 | enum gdb_signal sig; | |
5041 | struct regcache *regcache; | |
5042 | ||
5043 | infrun_debug_printf | |
5044 | ("target_wait %s, saving status for %d.%ld.%ld", | |
5045 | target_waitstatus_to_string (&event.ws).c_str (), | |
5046 | t->ptid.pid (), t->ptid.lwp (), t->ptid.tid ()); | |
5047 | ||
5048 | /* Record for later. */ | |
5049 | save_waitstatus (t, &event.ws); | |
5050 | ||
5051 | sig = (event.ws.kind == TARGET_WAITKIND_STOPPED | |
5052 | ? event.ws.value.sig : GDB_SIGNAL_0); | |
5053 | ||
5054 | if (displaced_step_finish (t, sig) | |
5055 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) | |
5056 | { | |
5057 | /* Add it back to the step-over queue. */ | |
5058 | t->control.trap_expected = 0; | |
8ff53139 PA |
5059 | if (!t->inf->detaching) |
5060 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
5061 | } |
5062 | ||
5063 | regcache = get_thread_regcache (t); | |
5064 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
5065 | ||
5066 | infrun_debug_printf ("saved stop_pc=%s for %s " | |
5067 | "(currently_stepping=%d)", | |
5068 | paddress (target_gdbarch (), | |
5069 | t->suspend.stop_pc), | |
5070 | target_pid_to_str (t->ptid).c_str (), | |
5071 | currently_stepping (t)); | |
5072 | } | |
5073 | } | |
5074 | ||
5075 | return false; | |
5076 | } | |
5077 | ||
6efcd9a8 | 5078 | /* See infrun.h. */ |
372316f1 | 5079 | |
6efcd9a8 | 5080 | void |
8631fd9b | 5081 | stop_all_threads (const char *reason, inferior *inf) |
372316f1 PA |
5082 | { |
5083 | /* We may need multiple passes to discover all threads. */ | |
5084 | int pass; | |
5085 | int iterations = 0; | |
372316f1 | 5086 | |
53cccef1 | 5087 | gdb_assert (exists_non_stop_target ()); |
372316f1 | 5088 | |
8631fd9b SM |
5089 | INFRUN_SCOPED_DEBUG_START_END ("reason=%s, inf=%d", reason, |
5090 | inf != nullptr ? inf->num : -1); | |
372316f1 | 5091 | |
00431a78 | 5092 | scoped_restore_current_thread restore_thread; |
372316f1 | 5093 | |
8631fd9b | 5094 | /* Enable thread events on relevant targets. */ |
6ad82919 TBA |
5095 | for (auto *target : all_non_exited_process_targets ()) |
5096 | { | |
8631fd9b SM |
5097 | if (inf != nullptr && inf->process_target () != target) |
5098 | continue; | |
5099 | ||
6ad82919 TBA |
5100 | switch_to_target_no_thread (target); |
5101 | target_thread_events (true); | |
5102 | } | |
5103 | ||
5104 | SCOPE_EXIT | |
5105 | { | |
8631fd9b | 5106 | /* Disable thread events on relevant targets. */ |
6ad82919 TBA |
5107 | for (auto *target : all_non_exited_process_targets ()) |
5108 | { | |
8631fd9b SM |
5109 | if (inf != nullptr && inf->process_target () != target) |
5110 | continue; | |
5111 | ||
6ad82919 TBA |
5112 | switch_to_target_no_thread (target); |
5113 | target_thread_events (false); | |
5114 | } | |
5115 | ||
17417fb0 | 5116 | /* Use debug_prefixed_printf directly to get a meaningful function |
dda83cd7 | 5117 | name. */ |
6ad82919 | 5118 | if (debug_infrun) |
17417fb0 | 5119 | debug_prefixed_printf ("infrun", "stop_all_threads", "done"); |
6ad82919 | 5120 | }; |
65706a29 | 5121 | |
372316f1 PA |
5122 | /* Request threads to stop, and then wait for the stops. Because |
5123 | threads we already know about can spawn more threads while we're | |
5124 | trying to stop them, and we only learn about new threads when we | |
5125 | update the thread list, do this in a loop, and keep iterating | |
5126 | until two passes find no threads that need to be stopped. */ | |
5127 | for (pass = 0; pass < 2; pass++, iterations++) | |
5128 | { | |
1eb8556f | 5129 | infrun_debug_printf ("pass=%d, iterations=%d", pass, iterations); |
372316f1 PA |
5130 | while (1) |
5131 | { | |
29d6859f | 5132 | int waits_needed = 0; |
372316f1 | 5133 | |
a05575d3 TBA |
5134 | for (auto *target : all_non_exited_process_targets ()) |
5135 | { | |
8631fd9b SM |
5136 | if (inf != nullptr && inf->process_target () != target) |
5137 | continue; | |
5138 | ||
a05575d3 TBA |
5139 | switch_to_target_no_thread (target); |
5140 | update_thread_list (); | |
5141 | } | |
372316f1 PA |
5142 | |
5143 | /* Go through all threads looking for threads that we need | |
5144 | to tell the target to stop. */ | |
08036331 | 5145 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 5146 | { |
8631fd9b SM |
5147 | if (inf != nullptr && t->inf != inf) |
5148 | continue; | |
5149 | ||
53cccef1 TBA |
5150 | /* For a single-target setting with an all-stop target, |
5151 | we would not even arrive here. For a multi-target | |
5152 | setting, until GDB is able to handle a mixture of | |
5153 | all-stop and non-stop targets, simply skip all-stop | |
5154 | targets' threads. This should be fine due to the | |
5155 | protection of 'check_multi_target_resumption'. */ | |
5156 | ||
5157 | switch_to_thread_no_regs (t); | |
5158 | if (!target_is_non_stop_p ()) | |
5159 | continue; | |
5160 | ||
372316f1 PA |
5161 | if (t->executing) |
5162 | { | |
5163 | /* If already stopping, don't request a stop again. | |
5164 | We just haven't seen the notification yet. */ | |
5165 | if (!t->stop_requested) | |
5166 | { | |
1eb8556f SM |
5167 | infrun_debug_printf (" %s executing, need stop", |
5168 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
5169 | target_stop (t->ptid); |
5170 | t->stop_requested = 1; | |
5171 | } | |
5172 | else | |
5173 | { | |
1eb8556f SM |
5174 | infrun_debug_printf (" %s executing, already stopping", |
5175 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
5176 | } |
5177 | ||
5178 | if (t->stop_requested) | |
29d6859f | 5179 | waits_needed++; |
372316f1 PA |
5180 | } |
5181 | else | |
5182 | { | |
1eb8556f SM |
5183 | infrun_debug_printf (" %s not executing", |
5184 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
5185 | |
5186 | /* The thread may be not executing, but still be | |
5187 | resumed with a pending status to process. */ | |
719546c4 | 5188 | t->resumed = false; |
372316f1 PA |
5189 | } |
5190 | } | |
5191 | ||
29d6859f | 5192 | if (waits_needed == 0) |
372316f1 PA |
5193 | break; |
5194 | ||
5195 | /* If we find new threads on the second iteration, restart | |
5196 | over. We want to see two iterations in a row with all | |
5197 | threads stopped. */ | |
5198 | if (pass > 0) | |
5199 | pass = -1; | |
5200 | ||
29d6859f | 5201 | for (int i = 0; i < waits_needed; i++) |
c29705b7 | 5202 | { |
29d6859f | 5203 | wait_one_event event = wait_one (); |
d758e62c PA |
5204 | if (handle_one (event)) |
5205 | break; | |
372316f1 PA |
5206 | } |
5207 | } | |
5208 | } | |
372316f1 PA |
5209 | } |
5210 | ||
f4836ba9 PA |
5211 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
5212 | ||
c4464ade | 5213 | static bool |
f4836ba9 PA |
5214 | handle_no_resumed (struct execution_control_state *ecs) |
5215 | { | |
3b12939d | 5216 | if (target_can_async_p ()) |
f4836ba9 | 5217 | { |
c4464ade | 5218 | bool any_sync = false; |
f4836ba9 | 5219 | |
2dab0c7b | 5220 | for (ui *ui : all_uis ()) |
3b12939d PA |
5221 | { |
5222 | if (ui->prompt_state == PROMPT_BLOCKED) | |
5223 | { | |
c4464ade | 5224 | any_sync = true; |
3b12939d PA |
5225 | break; |
5226 | } | |
5227 | } | |
5228 | if (!any_sync) | |
5229 | { | |
5230 | /* There were no unwaited-for children left in the target, but, | |
5231 | we're not synchronously waiting for events either. Just | |
5232 | ignore. */ | |
5233 | ||
1eb8556f | 5234 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)"); |
3b12939d | 5235 | prepare_to_wait (ecs); |
c4464ade | 5236 | return true; |
3b12939d | 5237 | } |
f4836ba9 PA |
5238 | } |
5239 | ||
5240 | /* Otherwise, if we were running a synchronous execution command, we | |
5241 | may need to cancel it and give the user back the terminal. | |
5242 | ||
5243 | In non-stop mode, the target can't tell whether we've already | |
5244 | consumed previous stop events, so it can end up sending us a | |
5245 | no-resumed event like so: | |
5246 | ||
5247 | #0 - thread 1 is left stopped | |
5248 | ||
5249 | #1 - thread 2 is resumed and hits breakpoint | |
dda83cd7 | 5250 | -> TARGET_WAITKIND_STOPPED |
f4836ba9 PA |
5251 | |
5252 | #2 - thread 3 is resumed and exits | |
dda83cd7 | 5253 | this is the last resumed thread, so |
f4836ba9 PA |
5254 | -> TARGET_WAITKIND_NO_RESUMED |
5255 | ||
5256 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
dda83cd7 | 5257 | it. |
f4836ba9 PA |
5258 | |
5259 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
dda83cd7 | 5260 | thread 2 is now resumed, so the event should be ignored. |
f4836ba9 PA |
5261 | |
5262 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
5263 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
5264 | event. But it could be that the event meant that thread 2 itself | |
5265 | (or whatever other thread was the last resumed thread) exited. | |
5266 | ||
5267 | To address this we refresh the thread list and check whether we | |
5268 | have resumed threads _now_. In the example above, this removes | |
5269 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
5270 | ignore this event. If we find no thread resumed, then we cancel | |
7d3badc6 PA |
5271 | the synchronous command and show "no unwaited-for " to the |
5272 | user. */ | |
f4836ba9 | 5273 | |
d6cc5d98 | 5274 | inferior *curr_inf = current_inferior (); |
7d3badc6 | 5275 | |
d6cc5d98 PA |
5276 | scoped_restore_current_thread restore_thread; |
5277 | ||
5278 | for (auto *target : all_non_exited_process_targets ()) | |
5279 | { | |
5280 | switch_to_target_no_thread (target); | |
5281 | update_thread_list (); | |
5282 | } | |
5283 | ||
5284 | /* If: | |
5285 | ||
5286 | - the current target has no thread executing, and | |
5287 | - the current inferior is native, and | |
5288 | - the current inferior is the one which has the terminal, and | |
5289 | - we did nothing, | |
5290 | ||
5291 | then a Ctrl-C from this point on would remain stuck in the | |
5292 | kernel, until a thread resumes and dequeues it. That would | |
5293 | result in the GDB CLI not reacting to Ctrl-C, not able to | |
5294 | interrupt the program. To address this, if the current inferior | |
5295 | no longer has any thread executing, we give the terminal to some | |
5296 | other inferior that has at least one thread executing. */ | |
5297 | bool swap_terminal = true; | |
5298 | ||
5299 | /* Whether to ignore this TARGET_WAITKIND_NO_RESUMED event, or | |
5300 | whether to report it to the user. */ | |
5301 | bool ignore_event = false; | |
7d3badc6 PA |
5302 | |
5303 | for (thread_info *thread : all_non_exited_threads ()) | |
f4836ba9 | 5304 | { |
d6cc5d98 PA |
5305 | if (swap_terminal && thread->executing) |
5306 | { | |
5307 | if (thread->inf != curr_inf) | |
5308 | { | |
5309 | target_terminal::ours (); | |
5310 | ||
5311 | switch_to_thread (thread); | |
5312 | target_terminal::inferior (); | |
5313 | } | |
5314 | swap_terminal = false; | |
5315 | } | |
5316 | ||
5317 | if (!ignore_event | |
5318 | && (thread->executing | |
5319 | || thread->suspend.waitstatus_pending_p)) | |
f4836ba9 | 5320 | { |
7d3badc6 PA |
5321 | /* Either there were no unwaited-for children left in the |
5322 | target at some point, but there are now, or some target | |
5323 | other than the eventing one has unwaited-for children | |
5324 | left. Just ignore. */ | |
1eb8556f SM |
5325 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED " |
5326 | "(ignoring: found resumed)"); | |
d6cc5d98 PA |
5327 | |
5328 | ignore_event = true; | |
f4836ba9 | 5329 | } |
d6cc5d98 PA |
5330 | |
5331 | if (ignore_event && !swap_terminal) | |
5332 | break; | |
5333 | } | |
5334 | ||
5335 | if (ignore_event) | |
5336 | { | |
5337 | switch_to_inferior_no_thread (curr_inf); | |
5338 | prepare_to_wait (ecs); | |
c4464ade | 5339 | return true; |
f4836ba9 PA |
5340 | } |
5341 | ||
5342 | /* Go ahead and report the event. */ | |
c4464ade | 5343 | return false; |
f4836ba9 PA |
5344 | } |
5345 | ||
05ba8510 PA |
5346 | /* Given an execution control state that has been freshly filled in by |
5347 | an event from the inferior, figure out what it means and take | |
5348 | appropriate action. | |
5349 | ||
5350 | The alternatives are: | |
5351 | ||
22bcd14b | 5352 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5353 | debugger. |
5354 | ||
5355 | 2) keep_going and return; to wait for the next event (set | |
5356 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5357 | once). */ | |
c906108c | 5358 | |
ec9499be | 5359 | static void |
595915c1 | 5360 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5361 | { |
595915c1 TT |
5362 | /* Make sure that all temporary struct value objects that were |
5363 | created during the handling of the event get deleted at the | |
5364 | end. */ | |
5365 | scoped_value_mark free_values; | |
5366 | ||
1eb8556f | 5367 | infrun_debug_printf ("%s", target_waitstatus_to_string (&ecs->ws).c_str ()); |
c29705b7 | 5368 | |
28736962 PA |
5369 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
5370 | { | |
5371 | /* We had an event in the inferior, but we are not interested in | |
5372 | handling it at this level. The lower layers have already | |
5373 | done what needs to be done, if anything. | |
5374 | ||
5375 | One of the possible circumstances for this is when the | |
5376 | inferior produces output for the console. The inferior has | |
5377 | not stopped, and we are ignoring the event. Another possible | |
5378 | circumstance is any event which the lower level knows will be | |
5379 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5380 | prepare_to_wait (ecs); |
5381 | return; | |
5382 | } | |
5383 | ||
65706a29 PA |
5384 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
5385 | { | |
65706a29 PA |
5386 | prepare_to_wait (ecs); |
5387 | return; | |
5388 | } | |
5389 | ||
0e5bf2a8 | 5390 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5391 | && handle_no_resumed (ecs)) |
5392 | return; | |
0e5bf2a8 | 5393 | |
5b6d1e4f PA |
5394 | /* Cache the last target/ptid/waitstatus. */ |
5395 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5396 | |
ca005067 | 5397 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5398 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5399 | |
0e5bf2a8 PA |
5400 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
5401 | { | |
5402 | /* No unwaited-for children left. IOW, all resumed children | |
5403 | have exited. */ | |
c4464ade | 5404 | stop_print_frame = false; |
22bcd14b | 5405 | stop_waiting (ecs); |
0e5bf2a8 PA |
5406 | return; |
5407 | } | |
5408 | ||
8c90c137 | 5409 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 5410 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 | 5411 | { |
5b6d1e4f | 5412 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5413 | /* If it's a new thread, add it to the thread database. */ |
5414 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5415 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5416 | |
5417 | /* Disable range stepping. If the next step request could use a | |
5418 | range, this will be end up re-enabled then. */ | |
5419 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5420 | } |
88ed393a JK |
5421 | |
5422 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 5423 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
5424 | |
5425 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5426 | reinit_frame_cache (); | |
5427 | ||
28736962 PA |
5428 | breakpoint_retire_moribund (); |
5429 | ||
2b009048 DJ |
5430 | /* First, distinguish signals caused by the debugger from signals |
5431 | that have to do with the program's own actions. Note that | |
5432 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5433 | on the operating system version. Here we detect when a SIGILL or | |
5434 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5435 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5436 | when we're trying to execute a breakpoint instruction on a | |
5437 | non-executable stack. This happens for call dummy breakpoints | |
5438 | for architectures like SPARC that place call dummies on the | |
5439 | stack. */ | |
2b009048 | 5440 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
5441 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
5442 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
5443 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 5444 | { |
00431a78 | 5445 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5446 | |
a01bda52 | 5447 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5448 | regcache_read_pc (regcache))) |
5449 | { | |
1eb8556f | 5450 | infrun_debug_printf ("Treating signal as SIGTRAP"); |
a493e3e2 | 5451 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 5452 | } |
2b009048 DJ |
5453 | } |
5454 | ||
293b3ebc | 5455 | mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws); |
8c90c137 | 5456 | |
488f131b JB |
5457 | switch (ecs->ws.kind) |
5458 | { | |
5459 | case TARGET_WAITKIND_LOADED: | |
72d383bb SM |
5460 | { |
5461 | context_switch (ecs); | |
5462 | /* Ignore gracefully during startup of the inferior, as it might | |
5463 | be the shell which has just loaded some objects, otherwise | |
5464 | add the symbols for the newly loaded objects. Also ignore at | |
5465 | the beginning of an attach or remote session; we will query | |
5466 | the full list of libraries once the connection is | |
5467 | established. */ | |
5468 | ||
5469 | stop_kind stop_soon = get_inferior_stop_soon (ecs); | |
5470 | if (stop_soon == NO_STOP_QUIETLY) | |
5471 | { | |
5472 | struct regcache *regcache; | |
edcc5120 | 5473 | |
72d383bb | 5474 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 | 5475 | |
72d383bb | 5476 | handle_solib_event (); |
ab04a2af | 5477 | |
72d383bb SM |
5478 | ecs->event_thread->control.stop_bpstat |
5479 | = bpstat_stop_status (regcache->aspace (), | |
5480 | ecs->event_thread->suspend.stop_pc, | |
5481 | ecs->event_thread, &ecs->ws); | |
c65d6b55 | 5482 | |
72d383bb | 5483 | if (handle_stop_requested (ecs)) |
94c57d6a | 5484 | return; |
488f131b | 5485 | |
72d383bb SM |
5486 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
5487 | { | |
5488 | /* A catchpoint triggered. */ | |
5489 | process_event_stop_test (ecs); | |
5490 | return; | |
5491 | } | |
55409f9d | 5492 | |
72d383bb SM |
5493 | /* If requested, stop when the dynamic linker notifies |
5494 | gdb of events. This allows the user to get control | |
5495 | and place breakpoints in initializer routines for | |
5496 | dynamically loaded objects (among other things). */ | |
5497 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
5498 | if (stop_on_solib_events) | |
5499 | { | |
5500 | /* Make sure we print "Stopped due to solib-event" in | |
5501 | normal_stop. */ | |
5502 | stop_print_frame = true; | |
b0f4b84b | 5503 | |
72d383bb SM |
5504 | stop_waiting (ecs); |
5505 | return; | |
5506 | } | |
5507 | } | |
b0f4b84b | 5508 | |
72d383bb SM |
5509 | /* If we are skipping through a shell, or through shared library |
5510 | loading that we aren't interested in, resume the program. If | |
5511 | we're running the program normally, also resume. */ | |
5512 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
5513 | { | |
5514 | /* Loading of shared libraries might have changed breakpoint | |
5515 | addresses. Make sure new breakpoints are inserted. */ | |
5516 | if (stop_soon == NO_STOP_QUIETLY) | |
5517 | insert_breakpoints (); | |
5518 | resume (GDB_SIGNAL_0); | |
5519 | prepare_to_wait (ecs); | |
5520 | return; | |
5521 | } | |
5c09a2c5 | 5522 | |
72d383bb SM |
5523 | /* But stop if we're attaching or setting up a remote |
5524 | connection. */ | |
5525 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5526 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5527 | { | |
5528 | infrun_debug_printf ("quietly stopped"); | |
5529 | stop_waiting (ecs); | |
5530 | return; | |
5531 | } | |
5532 | ||
5533 | internal_error (__FILE__, __LINE__, | |
5534 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
5535 | } | |
c5aa993b | 5536 | |
488f131b | 5537 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5538 | if (handle_stop_requested (ecs)) |
5539 | return; | |
00431a78 | 5540 | context_switch (ecs); |
64ce06e4 | 5541 | resume (GDB_SIGNAL_0); |
488f131b JB |
5542 | prepare_to_wait (ecs); |
5543 | return; | |
c5aa993b | 5544 | |
65706a29 | 5545 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5546 | if (handle_stop_requested (ecs)) |
5547 | return; | |
00431a78 | 5548 | context_switch (ecs); |
65706a29 PA |
5549 | if (!switch_back_to_stepped_thread (ecs)) |
5550 | keep_going (ecs); | |
5551 | return; | |
5552 | ||
488f131b | 5553 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5554 | case TARGET_WAITKIND_SIGNALLED: |
18493a00 PA |
5555 | { |
5556 | /* Depending on the system, ecs->ptid may point to a thread or | |
5557 | to a process. On some targets, target_mourn_inferior may | |
5558 | need to have access to the just-exited thread. That is the | |
5559 | case of GNU/Linux's "checkpoint" support, for example. | |
5560 | Call the switch_to_xxx routine as appropriate. */ | |
5561 | thread_info *thr = find_thread_ptid (ecs->target, ecs->ptid); | |
5562 | if (thr != nullptr) | |
5563 | switch_to_thread (thr); | |
5564 | else | |
5565 | { | |
5566 | inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); | |
5567 | switch_to_inferior_no_thread (inf); | |
5568 | } | |
5569 | } | |
6c95b8df | 5570 | handle_vfork_child_exec_or_exit (0); |
223ffa71 | 5571 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5572 | |
0c557179 SDJ |
5573 | /* Clearing any previous state of convenience variables. */ |
5574 | clear_exit_convenience_vars (); | |
5575 | ||
940c3c06 PA |
5576 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5577 | { | |
5578 | /* Record the exit code in the convenience variable $_exitcode, so | |
5579 | that the user can inspect this again later. */ | |
5580 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5581 | (LONGEST) ecs->ws.value.integer); | |
5582 | ||
5583 | /* Also record this in the inferior itself. */ | |
5584 | current_inferior ()->has_exit_code = 1; | |
5585 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5586 | |
98eb56a4 PA |
5587 | /* Support the --return-child-result option. */ |
5588 | return_child_result_value = ecs->ws.value.integer; | |
5589 | ||
76727919 | 5590 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
5591 | } |
5592 | else | |
0c557179 | 5593 | { |
00431a78 | 5594 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5595 | |
5596 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5597 | { | |
5598 | /* Set the value of the internal variable $_exitsignal, | |
5599 | which holds the signal uncaught by the inferior. */ | |
5600 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5601 | gdbarch_gdb_signal_to_target (gdbarch, | |
5602 | ecs->ws.value.sig)); | |
5603 | } | |
5604 | else | |
5605 | { | |
5606 | /* We don't have access to the target's method used for | |
5607 | converting between signal numbers (GDB's internal | |
5608 | representation <-> target's representation). | |
5609 | Therefore, we cannot do a good job at displaying this | |
5610 | information to the user. It's better to just warn | |
5611 | her about it (if infrun debugging is enabled), and | |
5612 | give up. */ | |
1eb8556f SM |
5613 | infrun_debug_printf ("Cannot fill $_exitsignal with the correct " |
5614 | "signal number."); | |
0c557179 SDJ |
5615 | } |
5616 | ||
76727919 | 5617 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 5618 | } |
8cf64490 | 5619 | |
488f131b | 5620 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5621 | target_mourn_inferior (inferior_ptid); |
c4464ade | 5622 | stop_print_frame = false; |
22bcd14b | 5623 | stop_waiting (ecs); |
488f131b | 5624 | return; |
c5aa993b | 5625 | |
488f131b | 5626 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5627 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5628 | /* Check whether the inferior is displaced stepping. */ |
5629 | { | |
00431a78 | 5630 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5631 | struct gdbarch *gdbarch = regcache->arch (); |
c0aba012 | 5632 | inferior *parent_inf = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 | 5633 | |
aeeb758d JB |
5634 | /* If this is a fork (child gets its own address space copy) |
5635 | and some displaced step buffers were in use at the time of | |
5636 | the fork, restore the displaced step buffer bytes in the | |
5637 | child process. | |
5638 | ||
5639 | Architectures which support displaced stepping and fork | |
5640 | events must supply an implementation of | |
5641 | gdbarch_displaced_step_restore_all_in_ptid. This is not | |
5642 | enforced during gdbarch validation to support architectures | |
5643 | which support displaced stepping but not forks. */ | |
5644 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED | |
5645 | && gdbarch_supports_displaced_stepping (gdbarch)) | |
187b041e SM |
5646 | gdbarch_displaced_step_restore_all_in_ptid |
5647 | (gdbarch, parent_inf, ecs->ws.value.related_pid); | |
c0aba012 SM |
5648 | |
5649 | /* If displaced stepping is supported, and thread ecs->ptid is | |
5650 | displaced stepping. */ | |
00431a78 | 5651 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 | 5652 | { |
e2d96639 YQ |
5653 | struct regcache *child_regcache; |
5654 | CORE_ADDR parent_pc; | |
5655 | ||
5656 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
5657 | indicating that the displaced stepping of syscall instruction | |
5658 | has been done. Perform cleanup for parent process here. Note | |
5659 | that this operation also cleans up the child process for vfork, | |
5660 | because their pages are shared. */ | |
7def77a1 | 5661 | displaced_step_finish (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5662 | /* Start a new step-over in another thread if there's one |
5663 | that needs it. */ | |
5664 | start_step_over (); | |
e2d96639 | 5665 | |
e2d96639 YQ |
5666 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5667 | the child's PC is also within the scratchpad. Set the child's PC | |
5668 | to the parent's PC value, which has already been fixed up. | |
5669 | FIXME: we use the parent's aspace here, although we're touching | |
5670 | the child, because the child hasn't been added to the inferior | |
5671 | list yet at this point. */ | |
5672 | ||
5673 | child_regcache | |
5b6d1e4f PA |
5674 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
5675 | ecs->ws.value.related_pid, | |
e2d96639 YQ |
5676 | gdbarch, |
5677 | parent_inf->aspace); | |
5678 | /* Read PC value of parent process. */ | |
5679 | parent_pc = regcache_read_pc (regcache); | |
5680 | ||
136821d9 SM |
5681 | displaced_debug_printf ("write child pc from %s to %s", |
5682 | paddress (gdbarch, | |
5683 | regcache_read_pc (child_regcache)), | |
5684 | paddress (gdbarch, parent_pc)); | |
e2d96639 YQ |
5685 | |
5686 | regcache_write_pc (child_regcache, parent_pc); | |
5687 | } | |
5688 | } | |
5689 | ||
00431a78 | 5690 | context_switch (ecs); |
5a2901d9 | 5691 | |
b242c3c2 PA |
5692 | /* Immediately detach breakpoints from the child before there's |
5693 | any chance of letting the user delete breakpoints from the | |
5694 | breakpoint lists. If we don't do this early, it's easy to | |
5695 | leave left over traps in the child, vis: "break foo; catch | |
5696 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5697 | the fork on the last `continue', and by that time the | |
5698 | breakpoint at "foo" is long gone from the breakpoint table. | |
5699 | If we vforked, then we don't need to unpatch here, since both | |
5700 | parent and child are sharing the same memory pages; we'll | |
5701 | need to unpatch at follow/detach time instead to be certain | |
5702 | that new breakpoints added between catchpoint hit time and | |
5703 | vfork follow are detached. */ | |
5704 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5705 | { | |
b242c3c2 PA |
5706 | /* This won't actually modify the breakpoint list, but will |
5707 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5708 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5709 | } |
5710 | ||
34b7e8a6 | 5711 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5712 | |
e58b0e63 PA |
5713 | /* In case the event is caught by a catchpoint, remember that |
5714 | the event is to be followed at the next resume of the thread, | |
5715 | and not immediately. */ | |
5716 | ecs->event_thread->pending_follow = ecs->ws; | |
5717 | ||
f2ffa92b PA |
5718 | ecs->event_thread->suspend.stop_pc |
5719 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 5720 | |
16c381f0 | 5721 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5722 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5723 | ecs->event_thread->suspend.stop_pc, |
5724 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 5725 | |
c65d6b55 PA |
5726 | if (handle_stop_requested (ecs)) |
5727 | return; | |
5728 | ||
ce12b012 PA |
5729 | /* If no catchpoint triggered for this, then keep going. Note |
5730 | that we're interested in knowing the bpstat actually causes a | |
5731 | stop, not just if it may explain the signal. Software | |
5732 | watchpoints, for example, always appear in the bpstat. */ | |
5733 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5734 | { |
5ab2fbf1 | 5735 | bool follow_child |
3e43a32a | 5736 | = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 5737 | |
a493e3e2 | 5738 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 | 5739 | |
5b6d1e4f PA |
5740 | process_stratum_target *targ |
5741 | = ecs->event_thread->inf->process_target (); | |
5742 | ||
5ab2fbf1 | 5743 | bool should_resume = follow_fork (); |
e58b0e63 | 5744 | |
5b6d1e4f PA |
5745 | /* Note that one of these may be an invalid pointer, |
5746 | depending on detach_fork. */ | |
00431a78 | 5747 | thread_info *parent = ecs->event_thread; |
5b6d1e4f PA |
5748 | thread_info *child |
5749 | = find_thread_ptid (targ, ecs->ws.value.related_pid); | |
6c95b8df | 5750 | |
a2077e25 PA |
5751 | /* At this point, the parent is marked running, and the |
5752 | child is marked stopped. */ | |
5753 | ||
5754 | /* If not resuming the parent, mark it stopped. */ | |
5755 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5756 | parent->set_running (false); |
a2077e25 PA |
5757 | |
5758 | /* If resuming the child, mark it running. */ | |
5759 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5760 | child->set_running (true); |
a2077e25 | 5761 | |
6c95b8df | 5762 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5763 | if (!detach_fork && (non_stop |
5764 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5765 | { |
5766 | if (follow_child) | |
5767 | switch_to_thread (parent); | |
5768 | else | |
5769 | switch_to_thread (child); | |
5770 | ||
5771 | ecs->event_thread = inferior_thread (); | |
5772 | ecs->ptid = inferior_ptid; | |
5773 | keep_going (ecs); | |
5774 | } | |
5775 | ||
5776 | if (follow_child) | |
5777 | switch_to_thread (child); | |
5778 | else | |
5779 | switch_to_thread (parent); | |
5780 | ||
e58b0e63 PA |
5781 | ecs->event_thread = inferior_thread (); |
5782 | ecs->ptid = inferior_ptid; | |
5783 | ||
5784 | if (should_resume) | |
5785 | keep_going (ecs); | |
5786 | else | |
22bcd14b | 5787 | stop_waiting (ecs); |
04e68871 DJ |
5788 | return; |
5789 | } | |
94c57d6a PA |
5790 | process_event_stop_test (ecs); |
5791 | return; | |
488f131b | 5792 | |
6c95b8df PA |
5793 | case TARGET_WAITKIND_VFORK_DONE: |
5794 | /* Done with the shared memory region. Re-insert breakpoints in | |
5795 | the parent, and keep going. */ | |
5796 | ||
00431a78 | 5797 | context_switch (ecs); |
6c95b8df | 5798 | |
8cc8b4da SM |
5799 | handle_vfork_done (ecs->event_thread); |
5800 | gdb_assert (inferior_thread () == ecs->event_thread); | |
c65d6b55 PA |
5801 | |
5802 | if (handle_stop_requested (ecs)) | |
5803 | return; | |
5804 | ||
6c95b8df PA |
5805 | /* This also takes care of reinserting breakpoints in the |
5806 | previously locked inferior. */ | |
5807 | keep_going (ecs); | |
5808 | return; | |
5809 | ||
488f131b | 5810 | case TARGET_WAITKIND_EXECD: |
488f131b | 5811 | |
cbd2b4e3 PA |
5812 | /* Note we can't read registers yet (the stop_pc), because we |
5813 | don't yet know the inferior's post-exec architecture. | |
5814 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5815 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5816 | |
6c95b8df PA |
5817 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5818 | handle_vfork_child_exec_or_exit (1); | |
5819 | ||
795e548f | 5820 | /* This causes the eventpoints and symbol table to be reset. |
dda83cd7 SM |
5821 | Must do this now, before trying to determine whether to |
5822 | stop. */ | |
71b43ef8 | 5823 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5824 | |
17d8546e DB |
5825 | /* In follow_exec we may have deleted the original thread and |
5826 | created a new one. Make sure that the event thread is the | |
5827 | execd thread for that case (this is a nop otherwise). */ | |
5828 | ecs->event_thread = inferior_thread (); | |
5829 | ||
f2ffa92b PA |
5830 | ecs->event_thread->suspend.stop_pc |
5831 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5832 | |
16c381f0 | 5833 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5834 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5835 | ecs->event_thread->suspend.stop_pc, |
5836 | ecs->event_thread, &ecs->ws); | |
795e548f | 5837 | |
71b43ef8 PA |
5838 | /* Note that this may be referenced from inside |
5839 | bpstat_stop_status above, through inferior_has_execd. */ | |
5840 | xfree (ecs->ws.value.execd_pathname); | |
5841 | ecs->ws.value.execd_pathname = NULL; | |
5842 | ||
c65d6b55 PA |
5843 | if (handle_stop_requested (ecs)) |
5844 | return; | |
5845 | ||
04e68871 | 5846 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5847 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5848 | { |
a493e3e2 | 5849 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5850 | keep_going (ecs); |
5851 | return; | |
5852 | } | |
94c57d6a PA |
5853 | process_event_stop_test (ecs); |
5854 | return; | |
488f131b | 5855 | |
b4dc5ffa | 5856 | /* Be careful not to try to gather much state about a thread |
dda83cd7 | 5857 | that's in a syscall. It's frequently a losing proposition. */ |
488f131b | 5858 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5859 | /* Getting the current syscall number. */ |
94c57d6a PA |
5860 | if (handle_syscall_event (ecs) == 0) |
5861 | process_event_stop_test (ecs); | |
5862 | return; | |
c906108c | 5863 | |
488f131b | 5864 | /* Before examining the threads further, step this thread to |
dda83cd7 SM |
5865 | get it entirely out of the syscall. (We get notice of the |
5866 | event when the thread is just on the verge of exiting a | |
5867 | syscall. Stepping one instruction seems to get it back | |
5868 | into user code.) */ | |
488f131b | 5869 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5870 | if (handle_syscall_event (ecs) == 0) |
5871 | process_event_stop_test (ecs); | |
5872 | return; | |
c906108c | 5873 | |
488f131b | 5874 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5875 | handle_signal_stop (ecs); |
5876 | return; | |
c906108c | 5877 | |
b2175913 MS |
5878 | case TARGET_WAITKIND_NO_HISTORY: |
5879 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5880 | |
d1988021 | 5881 | /* Switch to the stopped thread. */ |
00431a78 | 5882 | context_switch (ecs); |
1eb8556f | 5883 | infrun_debug_printf ("stopped"); |
d1988021 | 5884 | |
34b7e8a6 | 5885 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5886 | ecs->event_thread->suspend.stop_pc |
5887 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5888 | |
5889 | if (handle_stop_requested (ecs)) | |
5890 | return; | |
5891 | ||
76727919 | 5892 | gdb::observers::no_history.notify (); |
22bcd14b | 5893 | stop_waiting (ecs); |
b2175913 | 5894 | return; |
488f131b | 5895 | } |
4f5d7f63 PA |
5896 | } |
5897 | ||
372316f1 | 5898 | /* Restart threads back to what they were trying to do back when we |
8631fd9b SM |
5899 | paused them (because of an in-line step-over or vfork, for example). |
5900 | The EVENT_THREAD thread is ignored (not restarted). | |
5901 | ||
5902 | If INF is non-nullptr, only resume threads from INF. */ | |
4d9d9d04 PA |
5903 | |
5904 | static void | |
8631fd9b | 5905 | restart_threads (struct thread_info *event_thread, inferior *inf) |
372316f1 | 5906 | { |
8631fd9b SM |
5907 | INFRUN_SCOPED_DEBUG_START_END ("event_thread=%s, inf=%d", |
5908 | event_thread->ptid.to_string ().c_str (), | |
5909 | inf != nullptr ? inf->num : -1); | |
5910 | ||
372316f1 PA |
5911 | /* In case the instruction just stepped spawned a new thread. */ |
5912 | update_thread_list (); | |
5913 | ||
08036331 | 5914 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5915 | { |
8631fd9b SM |
5916 | if (inf != nullptr && tp->inf != inf) |
5917 | continue; | |
5918 | ||
ac7d717c PA |
5919 | if (tp->inf->detaching) |
5920 | { | |
5921 | infrun_debug_printf ("restart threads: [%s] inferior detaching", | |
5922 | target_pid_to_str (tp->ptid).c_str ()); | |
5923 | continue; | |
5924 | } | |
5925 | ||
f3f8ece4 PA |
5926 | switch_to_thread_no_regs (tp); |
5927 | ||
372316f1 PA |
5928 | if (tp == event_thread) |
5929 | { | |
1eb8556f SM |
5930 | infrun_debug_printf ("restart threads: [%s] is event thread", |
5931 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5932 | continue; |
5933 | } | |
5934 | ||
5935 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5936 | { | |
1eb8556f SM |
5937 | infrun_debug_printf ("restart threads: [%s] not meant to be running", |
5938 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5939 | continue; |
5940 | } | |
5941 | ||
5942 | if (tp->resumed) | |
5943 | { | |
1eb8556f SM |
5944 | infrun_debug_printf ("restart threads: [%s] resumed", |
5945 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5946 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
5947 | continue; | |
5948 | } | |
5949 | ||
5950 | if (thread_is_in_step_over_chain (tp)) | |
5951 | { | |
1eb8556f SM |
5952 | infrun_debug_printf ("restart threads: [%s] needs step-over", |
5953 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5954 | gdb_assert (!tp->resumed); |
5955 | continue; | |
5956 | } | |
5957 | ||
5958 | ||
5959 | if (tp->suspend.waitstatus_pending_p) | |
5960 | { | |
1eb8556f SM |
5961 | infrun_debug_printf ("restart threads: [%s] has pending status", |
5962 | target_pid_to_str (tp->ptid).c_str ()); | |
719546c4 | 5963 | tp->resumed = true; |
372316f1 PA |
5964 | continue; |
5965 | } | |
5966 | ||
c65d6b55 PA |
5967 | gdb_assert (!tp->stop_requested); |
5968 | ||
372316f1 PA |
5969 | /* If some thread needs to start a step-over at this point, it |
5970 | should still be in the step-over queue, and thus skipped | |
5971 | above. */ | |
5972 | if (thread_still_needs_step_over (tp)) | |
5973 | { | |
5974 | internal_error (__FILE__, __LINE__, | |
5975 | "thread [%s] needs a step-over, but not in " | |
5976 | "step-over queue\n", | |
a068643d | 5977 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5978 | } |
5979 | ||
5980 | if (currently_stepping (tp)) | |
5981 | { | |
1eb8556f SM |
5982 | infrun_debug_printf ("restart threads: [%s] was stepping", |
5983 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5984 | keep_going_stepped_thread (tp); |
5985 | } | |
5986 | else | |
5987 | { | |
5988 | struct execution_control_state ecss; | |
5989 | struct execution_control_state *ecs = &ecss; | |
5990 | ||
1eb8556f SM |
5991 | infrun_debug_printf ("restart threads: [%s] continuing", |
5992 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 5993 | reset_ecs (ecs, tp); |
00431a78 | 5994 | switch_to_thread (tp); |
372316f1 PA |
5995 | keep_going_pass_signal (ecs); |
5996 | } | |
5997 | } | |
5998 | } | |
5999 | ||
6000 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
6001 | a pending waitstatus. */ | |
6002 | ||
6003 | static int | |
6004 | resumed_thread_with_pending_status (struct thread_info *tp, | |
6005 | void *arg) | |
6006 | { | |
6007 | return (tp->resumed | |
6008 | && tp->suspend.waitstatus_pending_p); | |
6009 | } | |
6010 | ||
6011 | /* Called when we get an event that may finish an in-line or | |
6012 | out-of-line (displaced stepping) step-over started previously. | |
6013 | Return true if the event is processed and we should go back to the | |
6014 | event loop; false if the caller should continue processing the | |
6015 | event. */ | |
6016 | ||
6017 | static int | |
4d9d9d04 PA |
6018 | finish_step_over (struct execution_control_state *ecs) |
6019 | { | |
7def77a1 SM |
6020 | displaced_step_finish (ecs->event_thread, |
6021 | ecs->event_thread->suspend.stop_signal); | |
4d9d9d04 | 6022 | |
c4464ade | 6023 | bool had_step_over_info = step_over_info_valid_p (); |
372316f1 PA |
6024 | |
6025 | if (had_step_over_info) | |
4d9d9d04 PA |
6026 | { |
6027 | /* If we're stepping over a breakpoint with all threads locked, | |
6028 | then only the thread that was stepped should be reporting | |
6029 | back an event. */ | |
6030 | gdb_assert (ecs->event_thread->control.trap_expected); | |
6031 | ||
c65d6b55 | 6032 | clear_step_over_info (); |
4d9d9d04 PA |
6033 | } |
6034 | ||
fbea99ea | 6035 | if (!target_is_non_stop_p ()) |
372316f1 | 6036 | return 0; |
4d9d9d04 PA |
6037 | |
6038 | /* Start a new step-over in another thread if there's one that | |
6039 | needs it. */ | |
6040 | start_step_over (); | |
372316f1 PA |
6041 | |
6042 | /* If we were stepping over a breakpoint before, and haven't started | |
6043 | a new in-line step-over sequence, then restart all other threads | |
6044 | (except the event thread). We can't do this in all-stop, as then | |
6045 | e.g., we wouldn't be able to issue any other remote packet until | |
6046 | these other threads stop. */ | |
6047 | if (had_step_over_info && !step_over_info_valid_p ()) | |
6048 | { | |
6049 | struct thread_info *pending; | |
6050 | ||
6051 | /* If we only have threads with pending statuses, the restart | |
6052 | below won't restart any thread and so nothing re-inserts the | |
6053 | breakpoint we just stepped over. But we need it inserted | |
6054 | when we later process the pending events, otherwise if | |
6055 | another thread has a pending event for this breakpoint too, | |
6056 | we'd discard its event (because the breakpoint that | |
6057 | originally caused the event was no longer inserted). */ | |
00431a78 | 6058 | context_switch (ecs); |
372316f1 PA |
6059 | insert_breakpoints (); |
6060 | ||
6061 | restart_threads (ecs->event_thread); | |
6062 | ||
6063 | /* If we have events pending, go through handle_inferior_event | |
6064 | again, picking up a pending event at random. This avoids | |
6065 | thread starvation. */ | |
6066 | ||
6067 | /* But not if we just stepped over a watchpoint in order to let | |
6068 | the instruction execute so we can evaluate its expression. | |
6069 | The set of watchpoints that triggered is recorded in the | |
6070 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
6071 | If we processed another event first, that other event could | |
6072 | clobber this info. */ | |
6073 | if (ecs->event_thread->stepping_over_watchpoint) | |
6074 | return 0; | |
6075 | ||
6076 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
6077 | NULL); | |
6078 | if (pending != NULL) | |
6079 | { | |
6080 | struct thread_info *tp = ecs->event_thread; | |
6081 | struct regcache *regcache; | |
6082 | ||
1eb8556f SM |
6083 | infrun_debug_printf ("found resumed threads with " |
6084 | "pending events, saving status"); | |
372316f1 PA |
6085 | |
6086 | gdb_assert (pending != tp); | |
6087 | ||
6088 | /* Record the event thread's event for later. */ | |
6089 | save_waitstatus (tp, &ecs->ws); | |
6090 | /* This was cleared early, by handle_inferior_event. Set it | |
6091 | so this pending event is considered by | |
6092 | do_target_wait. */ | |
719546c4 | 6093 | tp->resumed = true; |
372316f1 PA |
6094 | |
6095 | gdb_assert (!tp->executing); | |
6096 | ||
00431a78 | 6097 | regcache = get_thread_regcache (tp); |
372316f1 PA |
6098 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
6099 | ||
1eb8556f SM |
6100 | infrun_debug_printf ("saved stop_pc=%s for %s " |
6101 | "(currently_stepping=%d)", | |
6102 | paddress (target_gdbarch (), | |
dda83cd7 | 6103 | tp->suspend.stop_pc), |
1eb8556f SM |
6104 | target_pid_to_str (tp->ptid).c_str (), |
6105 | currently_stepping (tp)); | |
372316f1 PA |
6106 | |
6107 | /* This in-line step-over finished; clear this so we won't | |
6108 | start a new one. This is what handle_signal_stop would | |
6109 | do, if we returned false. */ | |
6110 | tp->stepping_over_breakpoint = 0; | |
6111 | ||
6112 | /* Wake up the event loop again. */ | |
6113 | mark_async_event_handler (infrun_async_inferior_event_token); | |
6114 | ||
6115 | prepare_to_wait (ecs); | |
6116 | return 1; | |
6117 | } | |
6118 | } | |
6119 | ||
6120 | return 0; | |
4d9d9d04 PA |
6121 | } |
6122 | ||
4f5d7f63 PA |
6123 | /* Come here when the program has stopped with a signal. */ |
6124 | ||
6125 | static void | |
6126 | handle_signal_stop (struct execution_control_state *ecs) | |
6127 | { | |
6128 | struct frame_info *frame; | |
6129 | struct gdbarch *gdbarch; | |
6130 | int stopped_by_watchpoint; | |
6131 | enum stop_kind stop_soon; | |
6132 | int random_signal; | |
c906108c | 6133 | |
f0407826 DE |
6134 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
6135 | ||
c65d6b55 PA |
6136 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
6137 | ||
f0407826 DE |
6138 | /* Do we need to clean up the state of a thread that has |
6139 | completed a displaced single-step? (Doing so usually affects | |
6140 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
6141 | if (finish_step_over (ecs)) |
6142 | return; | |
f0407826 DE |
6143 | |
6144 | /* If we either finished a single-step or hit a breakpoint, but | |
6145 | the user wanted this thread to be stopped, pretend we got a | |
6146 | SIG0 (generic unsignaled stop). */ | |
6147 | if (ecs->event_thread->stop_requested | |
6148 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
6149 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 6150 | |
f2ffa92b PA |
6151 | ecs->event_thread->suspend.stop_pc |
6152 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 6153 | |
2ab76a18 PA |
6154 | context_switch (ecs); |
6155 | ||
6156 | if (deprecated_context_hook) | |
6157 | deprecated_context_hook (ecs->event_thread->global_num); | |
6158 | ||
527159b7 | 6159 | if (debug_infrun) |
237fc4c9 | 6160 | { |
00431a78 | 6161 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 6162 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 6163 | |
1eb8556f SM |
6164 | infrun_debug_printf ("stop_pc=%s", |
6165 | paddress (reg_gdbarch, | |
6166 | ecs->event_thread->suspend.stop_pc)); | |
d92524f1 | 6167 | if (target_stopped_by_watchpoint ()) |
237fc4c9 | 6168 | { |
dda83cd7 | 6169 | CORE_ADDR addr; |
abbb1732 | 6170 | |
1eb8556f | 6171 | infrun_debug_printf ("stopped by watchpoint"); |
237fc4c9 | 6172 | |
328d42d8 SM |
6173 | if (target_stopped_data_address (current_inferior ()->top_target (), |
6174 | &addr)) | |
1eb8556f | 6175 | infrun_debug_printf ("stopped data address=%s", |
dda83cd7 SM |
6176 | paddress (reg_gdbarch, addr)); |
6177 | else | |
1eb8556f | 6178 | infrun_debug_printf ("(no data address available)"); |
237fc4c9 PA |
6179 | } |
6180 | } | |
527159b7 | 6181 | |
36fa8042 PA |
6182 | /* This is originated from start_remote(), start_inferior() and |
6183 | shared libraries hook functions. */ | |
00431a78 | 6184 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
6185 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
6186 | { | |
1eb8556f | 6187 | infrun_debug_printf ("quietly stopped"); |
c4464ade | 6188 | stop_print_frame = true; |
22bcd14b | 6189 | stop_waiting (ecs); |
36fa8042 PA |
6190 | return; |
6191 | } | |
6192 | ||
36fa8042 PA |
6193 | /* This originates from attach_command(). We need to overwrite |
6194 | the stop_signal here, because some kernels don't ignore a | |
6195 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
6196 | See more comments in inferior.h. On the other hand, if we | |
6197 | get a non-SIGSTOP, report it to the user - assume the backend | |
6198 | will handle the SIGSTOP if it should show up later. | |
6199 | ||
6200 | Also consider that the attach is complete when we see a | |
6201 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
6202 | target extended-remote report it instead of a SIGSTOP | |
6203 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
6204 | signal, so this is no exception. | |
6205 | ||
6206 | Also consider that the attach is complete when we see a | |
6207 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
6208 | the target to stop all threads of the inferior, in case the | |
6209 | low level attach operation doesn't stop them implicitly. If | |
6210 | they weren't stopped implicitly, then the stub will report a | |
6211 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
6212 | other than GDB's request. */ | |
6213 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
6214 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
6215 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6216 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
6217 | { | |
c4464ade | 6218 | stop_print_frame = true; |
22bcd14b | 6219 | stop_waiting (ecs); |
36fa8042 PA |
6220 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
6221 | return; | |
6222 | } | |
6223 | ||
568d6575 UW |
6224 | /* At this point, get hold of the now-current thread's frame. */ |
6225 | frame = get_current_frame (); | |
6226 | gdbarch = get_frame_arch (frame); | |
6227 | ||
2adfaa28 | 6228 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 6229 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 6230 | { |
af48d08f | 6231 | struct regcache *regcache; |
af48d08f | 6232 | CORE_ADDR pc; |
2adfaa28 | 6233 | |
00431a78 | 6234 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
6235 | const address_space *aspace = regcache->aspace (); |
6236 | ||
af48d08f | 6237 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 6238 | |
af48d08f PA |
6239 | /* However, before doing so, if this single-step breakpoint was |
6240 | actually for another thread, set this thread up for moving | |
6241 | past it. */ | |
6242 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
6243 | aspace, pc)) | |
6244 | { | |
6245 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 | 6246 | { |
1eb8556f SM |
6247 | infrun_debug_printf ("[%s] hit another thread's single-step " |
6248 | "breakpoint", | |
6249 | target_pid_to_str (ecs->ptid).c_str ()); | |
af48d08f PA |
6250 | ecs->hit_singlestep_breakpoint = 1; |
6251 | } | |
6252 | } | |
6253 | else | |
6254 | { | |
1eb8556f SM |
6255 | infrun_debug_printf ("[%s] hit its single-step breakpoint", |
6256 | target_pid_to_str (ecs->ptid).c_str ()); | |
2adfaa28 | 6257 | } |
488f131b | 6258 | } |
af48d08f | 6259 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 6260 | |
963f9c80 PA |
6261 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
6262 | && ecs->event_thread->control.trap_expected | |
6263 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
6264 | stopped_by_watchpoint = 0; |
6265 | else | |
6266 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
6267 | ||
6268 | /* If necessary, step over this watchpoint. We'll be back to display | |
6269 | it in a moment. */ | |
6270 | if (stopped_by_watchpoint | |
9aed480c | 6271 | && (target_have_steppable_watchpoint () |
568d6575 | 6272 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 6273 | { |
488f131b | 6274 | /* At this point, we are stopped at an instruction which has |
dda83cd7 SM |
6275 | attempted to write to a piece of memory under control of |
6276 | a watchpoint. The instruction hasn't actually executed | |
6277 | yet. If we were to evaluate the watchpoint expression | |
6278 | now, we would get the old value, and therefore no change | |
6279 | would seem to have occurred. | |
6280 | ||
6281 | In order to make watchpoints work `right', we really need | |
6282 | to complete the memory write, and then evaluate the | |
6283 | watchpoint expression. We do this by single-stepping the | |
d983da9c DJ |
6284 | target. |
6285 | ||
7f89fd65 | 6286 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
6287 | it. For example, the PA can (with some kernel cooperation) |
6288 | single step over a watchpoint without disabling the watchpoint. | |
6289 | ||
6290 | It is far more common to need to disable a watchpoint to step | |
6291 | the inferior over it. If we have non-steppable watchpoints, | |
6292 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
6293 | disable all watchpoints. |
6294 | ||
6295 | Any breakpoint at PC must also be stepped over -- if there's | |
6296 | one, it will have already triggered before the watchpoint | |
6297 | triggered, and we either already reported it to the user, or | |
6298 | it didn't cause a stop and we called keep_going. In either | |
6299 | case, if there was a breakpoint at PC, we must be trying to | |
6300 | step past it. */ | |
6301 | ecs->event_thread->stepping_over_watchpoint = 1; | |
6302 | keep_going (ecs); | |
488f131b JB |
6303 | return; |
6304 | } | |
6305 | ||
4e1c45ea | 6306 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 6307 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
6308 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
6309 | ecs->event_thread->control.stop_step = 0; | |
c4464ade | 6310 | stop_print_frame = true; |
488f131b | 6311 | stopped_by_random_signal = 0; |
ddfe970e | 6312 | bpstat stop_chain = NULL; |
488f131b | 6313 | |
edb3359d DJ |
6314 | /* Hide inlined functions starting here, unless we just performed stepi or |
6315 | nexti. After stepi and nexti, always show the innermost frame (not any | |
6316 | inline function call sites). */ | |
16c381f0 | 6317 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 6318 | { |
00431a78 PA |
6319 | const address_space *aspace |
6320 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
6321 | |
6322 | /* skip_inline_frames is expensive, so we avoid it if we can | |
6323 | determine that the address is one where functions cannot have | |
6324 | been inlined. This improves performance with inferiors that | |
6325 | load a lot of shared libraries, because the solib event | |
6326 | breakpoint is defined as the address of a function (i.e. not | |
6327 | inline). Note that we have to check the previous PC as well | |
6328 | as the current one to catch cases when we have just | |
6329 | single-stepped off a breakpoint prior to reinstating it. | |
6330 | Note that we're assuming that the code we single-step to is | |
6331 | not inline, but that's not definitive: there's nothing | |
6332 | preventing the event breakpoint function from containing | |
6333 | inlined code, and the single-step ending up there. If the | |
6334 | user had set a breakpoint on that inlined code, the missing | |
6335 | skip_inline_frames call would break things. Fortunately | |
6336 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
6337 | if (!pc_at_non_inline_function (aspace, |
6338 | ecs->event_thread->suspend.stop_pc, | |
6339 | &ecs->ws) | |
a210c238 MR |
6340 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
6341 | && ecs->event_thread->control.trap_expected | |
6342 | && pc_at_non_inline_function (aspace, | |
6343 | ecs->event_thread->prev_pc, | |
09ac7c10 | 6344 | &ecs->ws))) |
1c5a993e | 6345 | { |
f2ffa92b PA |
6346 | stop_chain = build_bpstat_chain (aspace, |
6347 | ecs->event_thread->suspend.stop_pc, | |
6348 | &ecs->ws); | |
00431a78 | 6349 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
6350 | |
6351 | /* Re-fetch current thread's frame in case that invalidated | |
6352 | the frame cache. */ | |
6353 | frame = get_current_frame (); | |
6354 | gdbarch = get_frame_arch (frame); | |
6355 | } | |
0574c78f | 6356 | } |
edb3359d | 6357 | |
a493e3e2 | 6358 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 6359 | && ecs->event_thread->control.trap_expected |
568d6575 | 6360 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6361 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6362 | { |
b50d7442 | 6363 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6364 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6365 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6366 | with a delay slot. It needs to be stepped twice, once for |
6367 | the instruction and once for the delay slot. */ | |
6368 | int step_through_delay | |
568d6575 | 6369 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6370 | |
1eb8556f SM |
6371 | if (step_through_delay) |
6372 | infrun_debug_printf ("step through delay"); | |
6373 | ||
16c381f0 JK |
6374 | if (ecs->event_thread->control.step_range_end == 0 |
6375 | && step_through_delay) | |
3352ef37 AC |
6376 | { |
6377 | /* The user issued a continue when stopped at a breakpoint. | |
6378 | Set up for another trap and get out of here. */ | |
dda83cd7 SM |
6379 | ecs->event_thread->stepping_over_breakpoint = 1; |
6380 | keep_going (ecs); | |
6381 | return; | |
3352ef37 AC |
6382 | } |
6383 | else if (step_through_delay) | |
6384 | { | |
6385 | /* The user issued a step when stopped at a breakpoint. | |
6386 | Maybe we should stop, maybe we should not - the delay | |
6387 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6388 | case, don't decide that here, just set |
6389 | ecs->stepping_over_breakpoint, making sure we | |
6390 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6391 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6392 | } |
6393 | } | |
6394 | ||
ab04a2af TT |
6395 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6396 | handles this event. */ | |
6397 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6398 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
6399 | ecs->event_thread->suspend.stop_pc, |
6400 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 6401 | |
ab04a2af TT |
6402 | /* Following in case break condition called a |
6403 | function. */ | |
c4464ade | 6404 | stop_print_frame = true; |
73dd234f | 6405 | |
ab04a2af TT |
6406 | /* This is where we handle "moribund" watchpoints. Unlike |
6407 | software breakpoints traps, hardware watchpoint traps are | |
6408 | always distinguishable from random traps. If no high-level | |
6409 | watchpoint is associated with the reported stop data address | |
6410 | anymore, then the bpstat does not explain the signal --- | |
6411 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6412 | set. */ | |
6413 | ||
1eb8556f | 6414 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
47591c29 | 6415 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6416 | GDB_SIGNAL_TRAP) |
ab04a2af | 6417 | && stopped_by_watchpoint) |
1eb8556f SM |
6418 | { |
6419 | infrun_debug_printf ("no user watchpoint explains watchpoint SIGTRAP, " | |
6420 | "ignoring"); | |
6421 | } | |
73dd234f | 6422 | |
bac7d97b | 6423 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6424 | at one stage in the past included checks for an inferior |
6425 | function call's call dummy's return breakpoint. The original | |
6426 | comment, that went with the test, read: | |
03cebad2 | 6427 | |
ab04a2af TT |
6428 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6429 | another signal besides SIGTRAP, so check here as well as | |
6430 | above.'' | |
73dd234f | 6431 | |
ab04a2af TT |
6432 | If someone ever tries to get call dummys on a |
6433 | non-executable stack to work (where the target would stop | |
6434 | with something like a SIGSEGV), then those tests might need | |
6435 | to be re-instated. Given, however, that the tests were only | |
6436 | enabled when momentary breakpoints were not being used, I | |
6437 | suspect that it won't be the case. | |
488f131b | 6438 | |
ab04a2af TT |
6439 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6440 | be necessary for call dummies on a non-executable stack on | |
6441 | SPARC. */ | |
488f131b | 6442 | |
bac7d97b | 6443 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6444 | random_signal |
6445 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
6446 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 6447 | |
1cf4d951 PA |
6448 | /* Maybe this was a trap for a software breakpoint that has since |
6449 | been removed. */ | |
6450 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6451 | { | |
5133a315 LM |
6452 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
6453 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
6454 | { |
6455 | struct regcache *regcache; | |
6456 | int decr_pc; | |
6457 | ||
6458 | /* Re-adjust PC to what the program would see if GDB was not | |
6459 | debugging it. */ | |
00431a78 | 6460 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6461 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6462 | if (decr_pc != 0) |
6463 | { | |
07036511 TT |
6464 | gdb::optional<scoped_restore_tmpl<int>> |
6465 | restore_operation_disable; | |
1cf4d951 PA |
6466 | |
6467 | if (record_full_is_used ()) | |
07036511 TT |
6468 | restore_operation_disable.emplace |
6469 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6470 | |
f2ffa92b PA |
6471 | regcache_write_pc (regcache, |
6472 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
6473 | } |
6474 | } | |
6475 | else | |
6476 | { | |
6477 | /* A delayed software breakpoint event. Ignore the trap. */ | |
1eb8556f | 6478 | infrun_debug_printf ("delayed software breakpoint trap, ignoring"); |
1cf4d951 PA |
6479 | random_signal = 0; |
6480 | } | |
6481 | } | |
6482 | ||
6483 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6484 | has since been removed. */ | |
6485 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6486 | { | |
6487 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
1eb8556f SM |
6488 | infrun_debug_printf ("delayed hardware breakpoint/watchpoint " |
6489 | "trap, ignoring"); | |
1cf4d951 PA |
6490 | random_signal = 0; |
6491 | } | |
6492 | ||
bac7d97b PA |
6493 | /* If not, perhaps stepping/nexting can. */ |
6494 | if (random_signal) | |
6495 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6496 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6497 | |
2adfaa28 PA |
6498 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6499 | thread. Single-step breakpoints are transparent to the | |
6500 | breakpoints module. */ | |
6501 | if (random_signal) | |
6502 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6503 | ||
bac7d97b PA |
6504 | /* No? Perhaps we got a moribund watchpoint. */ |
6505 | if (random_signal) | |
6506 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6507 | |
c65d6b55 PA |
6508 | /* Always stop if the user explicitly requested this thread to |
6509 | remain stopped. */ | |
6510 | if (ecs->event_thread->stop_requested) | |
6511 | { | |
6512 | random_signal = 1; | |
1eb8556f | 6513 | infrun_debug_printf ("user-requested stop"); |
c65d6b55 PA |
6514 | } |
6515 | ||
488f131b JB |
6516 | /* For the program's own signals, act according to |
6517 | the signal handling tables. */ | |
6518 | ||
ce12b012 | 6519 | if (random_signal) |
488f131b JB |
6520 | { |
6521 | /* Signal not for debugging purposes. */ | |
c9737c08 | 6522 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6523 | |
1eb8556f SM |
6524 | infrun_debug_printf ("random signal (%s)", |
6525 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6526 | |
488f131b JB |
6527 | stopped_by_random_signal = 1; |
6528 | ||
252fbfc8 PA |
6529 | /* Always stop on signals if we're either just gaining control |
6530 | of the program, or the user explicitly requested this thread | |
6531 | to remain stopped. */ | |
d6b48e9c | 6532 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6533 | || ecs->event_thread->stop_requested |
8ff53139 | 6534 | || signal_stop_state (ecs->event_thread->suspend.stop_signal)) |
488f131b | 6535 | { |
22bcd14b | 6536 | stop_waiting (ecs); |
488f131b JB |
6537 | return; |
6538 | } | |
b57bacec PA |
6539 | |
6540 | /* Notify observers the signal has "handle print" set. Note we | |
6541 | returned early above if stopping; normal_stop handles the | |
6542 | printing in that case. */ | |
6543 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6544 | { | |
6545 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6546 | target_terminal::ours_for_output (); |
76727919 | 6547 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 6548 | target_terminal::inferior (); |
b57bacec | 6549 | } |
488f131b JB |
6550 | |
6551 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6552 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6553 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6554 | |
f2ffa92b | 6555 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 6556 | && ecs->event_thread->control.trap_expected |
8358c15c | 6557 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6558 | { |
6559 | /* We were just starting a new sequence, attempting to | |
6560 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6561 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6562 | of the stepping range so GDB needs to remember to, when |
6563 | the signal handler returns, resume stepping off that | |
6564 | breakpoint. */ | |
6565 | /* To simplify things, "continue" is forced to use the same | |
6566 | code paths as single-step - set a breakpoint at the | |
6567 | signal return address and then, once hit, step off that | |
6568 | breakpoint. */ | |
1eb8556f | 6569 | infrun_debug_printf ("signal arrived while stepping over breakpoint"); |
d3169d93 | 6570 | |
2c03e5be | 6571 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6572 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6573 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6574 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6575 | |
6576 | /* If we were nexting/stepping some other thread, switch to | |
6577 | it, so that we don't continue it, losing control. */ | |
6578 | if (!switch_back_to_stepped_thread (ecs)) | |
6579 | keep_going (ecs); | |
9d799f85 | 6580 | return; |
68f53502 | 6581 | } |
9d799f85 | 6582 | |
e5f8a7cc | 6583 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
6584 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6585 | ecs->event_thread) | |
e5f8a7cc | 6586 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 6587 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6588 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6589 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6590 | { |
6591 | /* The inferior is about to take a signal that will take it | |
6592 | out of the single step range. Set a breakpoint at the | |
6593 | current PC (which is presumably where the signal handler | |
6594 | will eventually return) and then allow the inferior to | |
6595 | run free. | |
6596 | ||
6597 | Note that this is only needed for a signal delivered | |
6598 | while in the single-step range. Nested signals aren't a | |
6599 | problem as they eventually all return. */ | |
1eb8556f | 6600 | infrun_debug_printf ("signal may take us out of single-step range"); |
237fc4c9 | 6601 | |
372316f1 | 6602 | clear_step_over_info (); |
2c03e5be | 6603 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6604 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6605 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6606 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6607 | keep_going (ecs); |
6608 | return; | |
d303a6c7 | 6609 | } |
9d799f85 | 6610 | |
85102364 | 6611 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6612 | when either there's a nested signal, or when there's a |
6613 | pending signal enabled just as the signal handler returns | |
6614 | (leaving the inferior at the step-resume-breakpoint without | |
6615 | actually executing it). Either way continue until the | |
6616 | breakpoint is really hit. */ | |
c447ac0b PA |
6617 | |
6618 | if (!switch_back_to_stepped_thread (ecs)) | |
6619 | { | |
1eb8556f | 6620 | infrun_debug_printf ("random signal, keep going"); |
c447ac0b PA |
6621 | |
6622 | keep_going (ecs); | |
6623 | } | |
6624 | return; | |
488f131b | 6625 | } |
94c57d6a PA |
6626 | |
6627 | process_event_stop_test (ecs); | |
6628 | } | |
6629 | ||
6630 | /* Come here when we've got some debug event / signal we can explain | |
6631 | (IOW, not a random signal), and test whether it should cause a | |
6632 | stop, or whether we should resume the inferior (transparently). | |
6633 | E.g., could be a breakpoint whose condition evaluates false; we | |
6634 | could be still stepping within the line; etc. */ | |
6635 | ||
6636 | static void | |
6637 | process_event_stop_test (struct execution_control_state *ecs) | |
6638 | { | |
6639 | struct symtab_and_line stop_pc_sal; | |
6640 | struct frame_info *frame; | |
6641 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6642 | CORE_ADDR jmp_buf_pc; |
6643 | struct bpstat_what what; | |
94c57d6a | 6644 | |
cdaa5b73 | 6645 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6646 | |
cdaa5b73 PA |
6647 | frame = get_current_frame (); |
6648 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6649 | |
cdaa5b73 | 6650 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6651 | |
cdaa5b73 PA |
6652 | if (what.call_dummy) |
6653 | { | |
6654 | stop_stack_dummy = what.call_dummy; | |
6655 | } | |
186c406b | 6656 | |
243a9253 PA |
6657 | /* A few breakpoint types have callbacks associated (e.g., |
6658 | bp_jit_event). Run them now. */ | |
6659 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6660 | ||
cdaa5b73 PA |
6661 | /* If we hit an internal event that triggers symbol changes, the |
6662 | current frame will be invalidated within bpstat_what (e.g., if we | |
6663 | hit an internal solib event). Re-fetch it. */ | |
6664 | frame = get_current_frame (); | |
6665 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6666 | |
cdaa5b73 PA |
6667 | switch (what.main_action) |
6668 | { | |
6669 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6670 | /* If we hit the breakpoint at longjmp while stepping, we | |
6671 | install a momentary breakpoint at the target of the | |
6672 | jmp_buf. */ | |
186c406b | 6673 | |
1eb8556f | 6674 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME"); |
186c406b | 6675 | |
cdaa5b73 | 6676 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6677 | |
cdaa5b73 PA |
6678 | if (what.is_longjmp) |
6679 | { | |
6680 | struct value *arg_value; | |
6681 | ||
6682 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6683 | then use it to extract the arguments. The destination PC | |
6684 | is the third argument to the probe. */ | |
6685 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6686 | if (arg_value) | |
8fa0c4f8 AA |
6687 | { |
6688 | jmp_buf_pc = value_as_address (arg_value); | |
6689 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6690 | } | |
cdaa5b73 PA |
6691 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6692 | || !gdbarch_get_longjmp_target (gdbarch, | |
6693 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6694 | { |
1eb8556f SM |
6695 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME " |
6696 | "(!gdbarch_get_longjmp_target)"); | |
cdaa5b73 PA |
6697 | keep_going (ecs); |
6698 | return; | |
e2e4d78b | 6699 | } |
e2e4d78b | 6700 | |
cdaa5b73 PA |
6701 | /* Insert a breakpoint at resume address. */ |
6702 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6703 | } | |
6704 | else | |
6705 | check_exception_resume (ecs, frame); | |
6706 | keep_going (ecs); | |
6707 | return; | |
e81a37f7 | 6708 | |
cdaa5b73 PA |
6709 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6710 | { | |
6711 | struct frame_info *init_frame; | |
e81a37f7 | 6712 | |
cdaa5b73 | 6713 | /* There are several cases to consider. |
c906108c | 6714 | |
cdaa5b73 PA |
6715 | 1. The initiating frame no longer exists. In this case we |
6716 | must stop, because the exception or longjmp has gone too | |
6717 | far. | |
2c03e5be | 6718 | |
cdaa5b73 PA |
6719 | 2. The initiating frame exists, and is the same as the |
6720 | current frame. We stop, because the exception or longjmp | |
6721 | has been caught. | |
2c03e5be | 6722 | |
cdaa5b73 PA |
6723 | 3. The initiating frame exists and is different from the |
6724 | current frame. This means the exception or longjmp has | |
6725 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6726 | |
cdaa5b73 PA |
6727 | 4. longjmp breakpoint has been placed just to protect |
6728 | against stale dummy frames and user is not interested in | |
6729 | stopping around longjmps. */ | |
c5aa993b | 6730 | |
1eb8556f | 6731 | infrun_debug_printf ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME"); |
c5aa993b | 6732 | |
cdaa5b73 PA |
6733 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6734 | != NULL); | |
6735 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6736 | |
cdaa5b73 PA |
6737 | if (what.is_longjmp) |
6738 | { | |
b67a2c6f | 6739 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6740 | |
cdaa5b73 | 6741 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6742 | { |
cdaa5b73 PA |
6743 | /* Case 4. */ |
6744 | keep_going (ecs); | |
6745 | return; | |
e5ef252a | 6746 | } |
cdaa5b73 | 6747 | } |
c5aa993b | 6748 | |
cdaa5b73 | 6749 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6750 | |
cdaa5b73 PA |
6751 | if (init_frame) |
6752 | { | |
6753 | struct frame_id current_id | |
6754 | = get_frame_id (get_current_frame ()); | |
6755 | if (frame_id_eq (current_id, | |
6756 | ecs->event_thread->initiating_frame)) | |
6757 | { | |
6758 | /* Case 2. Fall through. */ | |
6759 | } | |
6760 | else | |
6761 | { | |
6762 | /* Case 3. */ | |
6763 | keep_going (ecs); | |
6764 | return; | |
6765 | } | |
68f53502 | 6766 | } |
488f131b | 6767 | |
cdaa5b73 PA |
6768 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6769 | exists. */ | |
6770 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6771 | |
bdc36728 | 6772 | end_stepping_range (ecs); |
cdaa5b73 PA |
6773 | } |
6774 | return; | |
e5ef252a | 6775 | |
cdaa5b73 | 6776 | case BPSTAT_WHAT_SINGLE: |
1eb8556f | 6777 | infrun_debug_printf ("BPSTAT_WHAT_SINGLE"); |
cdaa5b73 PA |
6778 | ecs->event_thread->stepping_over_breakpoint = 1; |
6779 | /* Still need to check other stuff, at least the case where we | |
6780 | are stepping and step out of the right range. */ | |
6781 | break; | |
e5ef252a | 6782 | |
cdaa5b73 | 6783 | case BPSTAT_WHAT_STEP_RESUME: |
1eb8556f | 6784 | infrun_debug_printf ("BPSTAT_WHAT_STEP_RESUME"); |
e5ef252a | 6785 | |
cdaa5b73 PA |
6786 | delete_step_resume_breakpoint (ecs->event_thread); |
6787 | if (ecs->event_thread->control.proceed_to_finish | |
6788 | && execution_direction == EXEC_REVERSE) | |
6789 | { | |
6790 | struct thread_info *tp = ecs->event_thread; | |
6791 | ||
6792 | /* We are finishing a function in reverse, and just hit the | |
6793 | step-resume breakpoint at the start address of the | |
6794 | function, and we're almost there -- just need to back up | |
6795 | by one more single-step, which should take us back to the | |
6796 | function call. */ | |
6797 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6798 | keep_going (ecs); | |
e5ef252a | 6799 | return; |
cdaa5b73 PA |
6800 | } |
6801 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6802 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6803 | && execution_direction == EXEC_REVERSE) |
6804 | { | |
6805 | /* We are stepping over a function call in reverse, and just | |
6806 | hit the step-resume breakpoint at the start address of | |
6807 | the function. Go back to single-stepping, which should | |
6808 | take us back to the function call. */ | |
6809 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6810 | keep_going (ecs); | |
6811 | return; | |
6812 | } | |
6813 | break; | |
e5ef252a | 6814 | |
cdaa5b73 | 6815 | case BPSTAT_WHAT_STOP_NOISY: |
1eb8556f | 6816 | infrun_debug_printf ("BPSTAT_WHAT_STOP_NOISY"); |
c4464ade | 6817 | stop_print_frame = true; |
e5ef252a | 6818 | |
33bf4c5c | 6819 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6820 | whether a/the breakpoint is there when the thread is next |
6821 | resumed. */ | |
6822 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6823 | |
22bcd14b | 6824 | stop_waiting (ecs); |
cdaa5b73 | 6825 | return; |
e5ef252a | 6826 | |
cdaa5b73 | 6827 | case BPSTAT_WHAT_STOP_SILENT: |
1eb8556f | 6828 | infrun_debug_printf ("BPSTAT_WHAT_STOP_SILENT"); |
c4464ade | 6829 | stop_print_frame = false; |
e5ef252a | 6830 | |
33bf4c5c | 6831 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6832 | whether a/the breakpoint is there when the thread is next |
6833 | resumed. */ | |
6834 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6835 | stop_waiting (ecs); |
cdaa5b73 PA |
6836 | return; |
6837 | ||
6838 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
1eb8556f | 6839 | infrun_debug_printf ("BPSTAT_WHAT_HP_STEP_RESUME"); |
cdaa5b73 PA |
6840 | |
6841 | delete_step_resume_breakpoint (ecs->event_thread); | |
6842 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6843 | { | |
6844 | /* Back when the step-resume breakpoint was inserted, we | |
6845 | were trying to single-step off a breakpoint. Go back to | |
6846 | doing that. */ | |
6847 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6848 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6849 | keep_going (ecs); | |
6850 | return; | |
e5ef252a | 6851 | } |
cdaa5b73 PA |
6852 | break; |
6853 | ||
6854 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6855 | break; | |
e5ef252a | 6856 | } |
c906108c | 6857 | |
af48d08f PA |
6858 | /* If we stepped a permanent breakpoint and we had a high priority |
6859 | step-resume breakpoint for the address we stepped, but we didn't | |
6860 | hit it, then we must have stepped into the signal handler. The | |
6861 | step-resume was only necessary to catch the case of _not_ | |
6862 | stepping into the handler, so delete it, and fall through to | |
6863 | checking whether the step finished. */ | |
6864 | if (ecs->event_thread->stepped_breakpoint) | |
6865 | { | |
6866 | struct breakpoint *sr_bp | |
6867 | = ecs->event_thread->control.step_resume_breakpoint; | |
6868 | ||
8d707a12 PA |
6869 | if (sr_bp != NULL |
6870 | && sr_bp->loc->permanent | |
af48d08f PA |
6871 | && sr_bp->type == bp_hp_step_resume |
6872 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6873 | { | |
1eb8556f | 6874 | infrun_debug_printf ("stepped permanent breakpoint, stopped in handler"); |
af48d08f PA |
6875 | delete_step_resume_breakpoint (ecs->event_thread); |
6876 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6877 | } | |
6878 | } | |
6879 | ||
cdaa5b73 PA |
6880 | /* We come here if we hit a breakpoint but should not stop for it. |
6881 | Possibly we also were stepping and should stop for that. So fall | |
6882 | through and test for stepping. But, if not stepping, do not | |
6883 | stop. */ | |
c906108c | 6884 | |
a7212384 UW |
6885 | /* In all-stop mode, if we're currently stepping but have stopped in |
6886 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6887 | if (switch_back_to_stepped_thread (ecs)) |
6888 | return; | |
776f04fa | 6889 | |
8358c15c | 6890 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6891 | { |
1eb8556f | 6892 | infrun_debug_printf ("step-resume breakpoint is inserted"); |
527159b7 | 6893 | |
488f131b | 6894 | /* Having a step-resume breakpoint overrides anything |
dda83cd7 SM |
6895 | else having to do with stepping commands until |
6896 | that breakpoint is reached. */ | |
488f131b JB |
6897 | keep_going (ecs); |
6898 | return; | |
6899 | } | |
c5aa993b | 6900 | |
16c381f0 | 6901 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6902 | { |
1eb8556f | 6903 | infrun_debug_printf ("no stepping, continue"); |
488f131b | 6904 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6905 | keep_going (ecs); |
6906 | return; | |
6907 | } | |
c5aa993b | 6908 | |
4b7703ad JB |
6909 | /* Re-fetch current thread's frame in case the code above caused |
6910 | the frame cache to be re-initialized, making our FRAME variable | |
6911 | a dangling pointer. */ | |
6912 | frame = get_current_frame (); | |
628fe4e4 | 6913 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6914 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6915 | |
488f131b | 6916 | /* If stepping through a line, keep going if still within it. |
c906108c | 6917 | |
488f131b JB |
6918 | Note that step_range_end is the address of the first instruction |
6919 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6920 | within it! |
6921 | ||
6922 | Note also that during reverse execution, we may be stepping | |
6923 | through a function epilogue and therefore must detect when | |
6924 | the current-frame changes in the middle of a line. */ | |
6925 | ||
f2ffa92b PA |
6926 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6927 | ecs->event_thread) | |
31410e84 | 6928 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6929 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6930 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6931 | { |
1eb8556f SM |
6932 | infrun_debug_printf |
6933 | ("stepping inside range [%s-%s]", | |
6934 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
6935 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6936 | |
c1e36e3e PA |
6937 | /* Tentatively re-enable range stepping; `resume' disables it if |
6938 | necessary (e.g., if we're stepping over a breakpoint or we | |
6939 | have software watchpoints). */ | |
6940 | ecs->event_thread->control.may_range_step = 1; | |
6941 | ||
b2175913 MS |
6942 | /* When stepping backward, stop at beginning of line range |
6943 | (unless it's the function entry point, in which case | |
6944 | keep going back to the call point). */ | |
f2ffa92b | 6945 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6946 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6947 | && stop_pc != ecs->stop_func_start |
6948 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6949 | end_stepping_range (ecs); |
b2175913 MS |
6950 | else |
6951 | keep_going (ecs); | |
6952 | ||
488f131b JB |
6953 | return; |
6954 | } | |
c5aa993b | 6955 | |
488f131b | 6956 | /* We stepped out of the stepping range. */ |
c906108c | 6957 | |
488f131b | 6958 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6959 | loader dynamic symbol resolution code... |
6960 | ||
6961 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6962 | time loader code and reach the callee's address. | |
6963 | ||
6964 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6965 | the runtime loader code is handled just like any other | |
6966 | undebuggable function call. Now we need only keep stepping | |
6967 | backward through the trampoline code, and that's handled further | |
6968 | down, so there is nothing for us to do here. */ | |
6969 | ||
6970 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6971 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6972 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6973 | { |
4c8c40e6 | 6974 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6975 | gdbarch_skip_solib_resolver (gdbarch, |
6976 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6977 | |
1eb8556f | 6978 | infrun_debug_printf ("stepped into dynsym resolve code"); |
527159b7 | 6979 | |
488f131b JB |
6980 | if (pc_after_resolver) |
6981 | { | |
6982 | /* Set up a step-resume breakpoint at the address | |
6983 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6984 | symtab_and_line sr_sal; |
488f131b | 6985 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6986 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6987 | |
a6d9a66e UW |
6988 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6989 | sr_sal, null_frame_id); | |
c5aa993b | 6990 | } |
c906108c | 6991 | |
488f131b JB |
6992 | keep_going (ecs); |
6993 | return; | |
6994 | } | |
c906108c | 6995 | |
1d509aa6 MM |
6996 | /* Step through an indirect branch thunk. */ |
6997 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6998 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6999 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 | 7000 | { |
1eb8556f | 7001 | infrun_debug_printf ("stepped into indirect branch thunk"); |
1d509aa6 MM |
7002 | keep_going (ecs); |
7003 | return; | |
7004 | } | |
7005 | ||
16c381f0 JK |
7006 | if (ecs->event_thread->control.step_range_end != 1 |
7007 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
7008 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 7009 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 7010 | { |
1eb8556f | 7011 | infrun_debug_printf ("stepped into signal trampoline"); |
42edda50 | 7012 | /* The inferior, while doing a "step" or "next", has ended up in |
dda83cd7 SM |
7013 | a signal trampoline (either by a signal being delivered or by |
7014 | the signal handler returning). Just single-step until the | |
7015 | inferior leaves the trampoline (either by calling the handler | |
7016 | or returning). */ | |
488f131b JB |
7017 | keep_going (ecs); |
7018 | return; | |
7019 | } | |
c906108c | 7020 | |
14132e89 MR |
7021 | /* If we're in the return path from a shared library trampoline, |
7022 | we want to proceed through the trampoline when stepping. */ | |
7023 | /* macro/2012-04-25: This needs to come before the subroutine | |
7024 | call check below as on some targets return trampolines look | |
7025 | like subroutine calls (MIPS16 return thunks). */ | |
7026 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
7027 | ecs->event_thread->suspend.stop_pc, |
7028 | ecs->stop_func_name) | |
14132e89 MR |
7029 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
7030 | { | |
7031 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
7032 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
7033 | CORE_ADDR real_stop_pc | |
7034 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 | 7035 | |
1eb8556f | 7036 | infrun_debug_printf ("stepped into solib return tramp"); |
14132e89 MR |
7037 | |
7038 | /* Only proceed through if we know where it's going. */ | |
7039 | if (real_stop_pc) | |
7040 | { | |
7041 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 7042 | symtab_and_line sr_sal; |
14132e89 MR |
7043 | sr_sal.pc = real_stop_pc; |
7044 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
7045 | sr_sal.pspace = get_frame_program_space (frame); | |
7046 | ||
7047 | /* Do not specify what the fp should be when we stop since | |
7048 | on some machines the prologue is where the new fp value | |
7049 | is established. */ | |
7050 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7051 | sr_sal, null_frame_id); | |
7052 | ||
7053 | /* Restart without fiddling with the step ranges or | |
7054 | other state. */ | |
7055 | keep_going (ecs); | |
7056 | return; | |
7057 | } | |
7058 | } | |
7059 | ||
c17eaafe DJ |
7060 | /* Check for subroutine calls. The check for the current frame |
7061 | equalling the step ID is not necessary - the check of the | |
7062 | previous frame's ID is sufficient - but it is a common case and | |
7063 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
7064 | |
7065 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
7066 | being equal, so to get into this block, both the current and | |
7067 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
7068 | /* The outer_frame_id check is a heuristic to detect stepping |
7069 | through startup code. If we step over an instruction which | |
7070 | sets the stack pointer from an invalid value to a valid value, | |
7071 | we may detect that as a subroutine call from the mythical | |
7072 | "outermost" function. This could be fixed by marking | |
7073 | outermost frames as !stack_p,code_p,special_p. Then the | |
7074 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 7075 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 7076 | for more. */ |
edb3359d | 7077 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 7078 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 7079 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
7080 | ecs->event_thread->control.step_stack_frame_id) |
7081 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 7082 | outer_frame_id) |
885eeb5b | 7083 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 7084 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 7085 | { |
f2ffa92b | 7086 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 7087 | CORE_ADDR real_stop_pc; |
8fb3e588 | 7088 | |
1eb8556f | 7089 | infrun_debug_printf ("stepped into subroutine"); |
527159b7 | 7090 | |
b7a084be | 7091 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
7092 | { |
7093 | /* I presume that step_over_calls is only 0 when we're | |
7094 | supposed to be stepping at the assembly language level | |
7095 | ("stepi"). Just stop. */ | |
388a8562 | 7096 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 7097 | end_stepping_range (ecs); |
95918acb AC |
7098 | return; |
7099 | } | |
8fb3e588 | 7100 | |
388a8562 MS |
7101 | /* Reverse stepping through solib trampolines. */ |
7102 | ||
7103 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 7104 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
7105 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
7106 | || (ecs->stop_func_start == 0 | |
7107 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
7108 | { | |
7109 | /* Any solib trampoline code can be handled in reverse | |
7110 | by simply continuing to single-step. We have already | |
7111 | executed the solib function (backwards), and a few | |
7112 | steps will take us back through the trampoline to the | |
7113 | caller. */ | |
7114 | keep_going (ecs); | |
7115 | return; | |
7116 | } | |
7117 | ||
16c381f0 | 7118 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 7119 | { |
b2175913 MS |
7120 | /* We're doing a "next". |
7121 | ||
7122 | Normal (forward) execution: set a breakpoint at the | |
7123 | callee's return address (the address at which the caller | |
7124 | will resume). | |
7125 | ||
7126 | Reverse (backward) execution. set the step-resume | |
7127 | breakpoint at the start of the function that we just | |
7128 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 7129 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
7130 | |
7131 | if (execution_direction == EXEC_REVERSE) | |
7132 | { | |
acf9414f JK |
7133 | /* If we're already at the start of the function, we've either |
7134 | just stepped backward into a single instruction function, | |
7135 | or stepped back out of a signal handler to the first instruction | |
7136 | of the function. Just keep going, which will single-step back | |
7137 | to the caller. */ | |
58c48e72 | 7138 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 7139 | { |
acf9414f | 7140 | /* Normal function call return (static or dynamic). */ |
51abb421 | 7141 | symtab_and_line sr_sal; |
acf9414f JK |
7142 | sr_sal.pc = ecs->stop_func_start; |
7143 | sr_sal.pspace = get_frame_program_space (frame); | |
7144 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7145 | sr_sal, null_frame_id); | |
7146 | } | |
b2175913 MS |
7147 | } |
7148 | else | |
568d6575 | 7149 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7150 | |
8567c30f AC |
7151 | keep_going (ecs); |
7152 | return; | |
7153 | } | |
a53c66de | 7154 | |
95918acb | 7155 | /* If we are in a function call trampoline (a stub between the |
dda83cd7 SM |
7156 | calling routine and the real function), locate the real |
7157 | function. That's what tells us (a) whether we want to step | |
7158 | into it at all, and (b) what prologue we want to run to the | |
7159 | end of, if we do step into it. */ | |
568d6575 | 7160 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 7161 | if (real_stop_pc == 0) |
568d6575 | 7162 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
7163 | if (real_stop_pc != 0) |
7164 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 7165 | |
db5f024e | 7166 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 7167 | { |
51abb421 | 7168 | symtab_and_line sr_sal; |
1b2bfbb9 | 7169 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 7170 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 7171 | |
a6d9a66e UW |
7172 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7173 | sr_sal, null_frame_id); | |
8fb3e588 AC |
7174 | keep_going (ecs); |
7175 | return; | |
1b2bfbb9 RC |
7176 | } |
7177 | ||
95918acb | 7178 | /* If we have line number information for the function we are |
1bfeeb0f JL |
7179 | thinking of stepping into and the function isn't on the skip |
7180 | list, step into it. | |
95918acb | 7181 | |
dda83cd7 SM |
7182 | If there are several symtabs at that PC (e.g. with include |
7183 | files), just want to know whether *any* of them have line | |
7184 | numbers. find_pc_line handles this. */ | |
95918acb AC |
7185 | { |
7186 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 7187 | |
95918acb | 7188 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 7189 | if (tmp_sal.line != 0 |
85817405 | 7190 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
7191 | tmp_sal) |
7192 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 7193 | { |
b2175913 | 7194 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 7195 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 7196 | else |
568d6575 | 7197 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
7198 | return; |
7199 | } | |
7200 | } | |
7201 | ||
7202 | /* If we have no line number and the step-stop-if-no-debug is | |
dda83cd7 SM |
7203 | set, we stop the step so that the user has a chance to switch |
7204 | in assembly mode. */ | |
16c381f0 | 7205 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 7206 | && step_stop_if_no_debug) |
95918acb | 7207 | { |
bdc36728 | 7208 | end_stepping_range (ecs); |
95918acb AC |
7209 | return; |
7210 | } | |
7211 | ||
b2175913 MS |
7212 | if (execution_direction == EXEC_REVERSE) |
7213 | { | |
acf9414f JK |
7214 | /* If we're already at the start of the function, we've either just |
7215 | stepped backward into a single instruction function without line | |
7216 | number info, or stepped back out of a signal handler to the first | |
7217 | instruction of the function without line number info. Just keep | |
7218 | going, which will single-step back to the caller. */ | |
7219 | if (ecs->stop_func_start != stop_pc) | |
7220 | { | |
7221 | /* Set a breakpoint at callee's start address. | |
7222 | From there we can step once and be back in the caller. */ | |
51abb421 | 7223 | symtab_and_line sr_sal; |
acf9414f JK |
7224 | sr_sal.pc = ecs->stop_func_start; |
7225 | sr_sal.pspace = get_frame_program_space (frame); | |
7226 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7227 | sr_sal, null_frame_id); | |
7228 | } | |
b2175913 MS |
7229 | } |
7230 | else | |
7231 | /* Set a breakpoint at callee's return address (the address | |
7232 | at which the caller will resume). */ | |
568d6575 | 7233 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7234 | |
95918acb | 7235 | keep_going (ecs); |
488f131b | 7236 | return; |
488f131b | 7237 | } |
c906108c | 7238 | |
fdd654f3 MS |
7239 | /* Reverse stepping through solib trampolines. */ |
7240 | ||
7241 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 7242 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 7243 | { |
f2ffa92b PA |
7244 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
7245 | ||
fdd654f3 MS |
7246 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
7247 | || (ecs->stop_func_start == 0 | |
7248 | && in_solib_dynsym_resolve_code (stop_pc))) | |
7249 | { | |
7250 | /* Any solib trampoline code can be handled in reverse | |
7251 | by simply continuing to single-step. We have already | |
7252 | executed the solib function (backwards), and a few | |
7253 | steps will take us back through the trampoline to the | |
7254 | caller. */ | |
7255 | keep_going (ecs); | |
7256 | return; | |
7257 | } | |
7258 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
7259 | { | |
7260 | /* Stepped backward into the solib dynsym resolver. | |
7261 | Set a breakpoint at its start and continue, then | |
7262 | one more step will take us out. */ | |
51abb421 | 7263 | symtab_and_line sr_sal; |
fdd654f3 | 7264 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 7265 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
7266 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7267 | sr_sal, null_frame_id); | |
7268 | keep_going (ecs); | |
7269 | return; | |
7270 | } | |
7271 | } | |
7272 | ||
8c95582d AB |
7273 | /* This always returns the sal for the inner-most frame when we are in a |
7274 | stack of inlined frames, even if GDB actually believes that it is in a | |
7275 | more outer frame. This is checked for below by calls to | |
7276 | inline_skipped_frames. */ | |
f2ffa92b | 7277 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 7278 | |
1b2bfbb9 RC |
7279 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
7280 | the trampoline processing logic, however, there are some trampolines | |
7281 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 7282 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 7283 | && ecs->stop_func_name == NULL |
2afb61aa | 7284 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 7285 | { |
1eb8556f | 7286 | infrun_debug_printf ("stepped into undebuggable function"); |
527159b7 | 7287 | |
1b2bfbb9 | 7288 | /* The inferior just stepped into, or returned to, an |
dda83cd7 SM |
7289 | undebuggable function (where there is no debugging information |
7290 | and no line number corresponding to the address where the | |
7291 | inferior stopped). Since we want to skip this kind of code, | |
7292 | we keep going until the inferior returns from this | |
7293 | function - unless the user has asked us not to (via | |
7294 | set step-mode) or we no longer know how to get back | |
7295 | to the call site. */ | |
14e60db5 | 7296 | if (step_stop_if_no_debug |
c7ce8faa | 7297 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
7298 | { |
7299 | /* If we have no line number and the step-stop-if-no-debug | |
7300 | is set, we stop the step so that the user has a chance to | |
7301 | switch in assembly mode. */ | |
bdc36728 | 7302 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7303 | return; |
7304 | } | |
7305 | else | |
7306 | { | |
7307 | /* Set a breakpoint at callee's return address (the address | |
7308 | at which the caller will resume). */ | |
568d6575 | 7309 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
7310 | keep_going (ecs); |
7311 | return; | |
7312 | } | |
7313 | } | |
7314 | ||
16c381f0 | 7315 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
7316 | { |
7317 | /* It is stepi or nexti. We always want to stop stepping after | |
dda83cd7 | 7318 | one instruction. */ |
1eb8556f | 7319 | infrun_debug_printf ("stepi/nexti"); |
bdc36728 | 7320 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7321 | return; |
7322 | } | |
7323 | ||
2afb61aa | 7324 | if (stop_pc_sal.line == 0) |
488f131b JB |
7325 | { |
7326 | /* We have no line number information. That means to stop | |
dda83cd7 SM |
7327 | stepping (does this always happen right after one instruction, |
7328 | when we do "s" in a function with no line numbers, | |
7329 | or can this happen as a result of a return or longjmp?). */ | |
1eb8556f | 7330 | infrun_debug_printf ("line number info"); |
bdc36728 | 7331 | end_stepping_range (ecs); |
488f131b JB |
7332 | return; |
7333 | } | |
c906108c | 7334 | |
edb3359d DJ |
7335 | /* Look for "calls" to inlined functions, part one. If the inline |
7336 | frame machinery detected some skipped call sites, we have entered | |
7337 | a new inline function. */ | |
7338 | ||
7339 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7340 | ecs->event_thread->control.step_frame_id) |
00431a78 | 7341 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 7342 | { |
1eb8556f | 7343 | infrun_debug_printf ("stepped into inlined function"); |
edb3359d | 7344 | |
51abb421 | 7345 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 7346 | |
16c381f0 | 7347 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
7348 | { |
7349 | /* For "step", we're going to stop. But if the call site | |
7350 | for this inlined function is on the same source line as | |
7351 | we were previously stepping, go down into the function | |
7352 | first. Otherwise stop at the call site. */ | |
7353 | ||
7354 | if (call_sal.line == ecs->event_thread->current_line | |
7355 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7356 | { |
7357 | step_into_inline_frame (ecs->event_thread); | |
7358 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7359 | { | |
7360 | keep_going (ecs); | |
7361 | return; | |
7362 | } | |
7363 | } | |
edb3359d | 7364 | |
bdc36728 | 7365 | end_stepping_range (ecs); |
edb3359d DJ |
7366 | return; |
7367 | } | |
7368 | else | |
7369 | { | |
7370 | /* For "next", we should stop at the call site if it is on a | |
7371 | different source line. Otherwise continue through the | |
7372 | inlined function. */ | |
7373 | if (call_sal.line == ecs->event_thread->current_line | |
7374 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7375 | keep_going (ecs); | |
7376 | else | |
bdc36728 | 7377 | end_stepping_range (ecs); |
edb3359d DJ |
7378 | return; |
7379 | } | |
7380 | } | |
7381 | ||
7382 | /* Look for "calls" to inlined functions, part two. If we are still | |
7383 | in the same real function we were stepping through, but we have | |
7384 | to go further up to find the exact frame ID, we are stepping | |
7385 | through a more inlined call beyond its call site. */ | |
7386 | ||
7387 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
7388 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7389 | ecs->event_thread->control.step_frame_id) |
edb3359d | 7390 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7391 | ecs->event_thread->control.step_frame_id)) |
edb3359d | 7392 | { |
1eb8556f | 7393 | infrun_debug_printf ("stepping through inlined function"); |
edb3359d | 7394 | |
4a4c04f1 BE |
7395 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7396 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7397 | keep_going (ecs); |
7398 | else | |
bdc36728 | 7399 | end_stepping_range (ecs); |
edb3359d DJ |
7400 | return; |
7401 | } | |
7402 | ||
8c95582d | 7403 | bool refresh_step_info = true; |
f2ffa92b | 7404 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea | 7405 | && (ecs->event_thread->current_line != stop_pc_sal.line |
24b21115 | 7406 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) |
488f131b | 7407 | { |
ebde6f2d TV |
7408 | /* We are at a different line. */ |
7409 | ||
8c95582d AB |
7410 | if (stop_pc_sal.is_stmt) |
7411 | { | |
ebde6f2d TV |
7412 | /* We are at the start of a statement. |
7413 | ||
7414 | So stop. Note that we don't stop if we step into the middle of a | |
7415 | statement. That is said to make things like for (;;) statements | |
7416 | work better. */ | |
1eb8556f | 7417 | infrun_debug_printf ("stepped to a different line"); |
8c95582d AB |
7418 | end_stepping_range (ecs); |
7419 | return; | |
7420 | } | |
7421 | else if (frame_id_eq (get_frame_id (get_current_frame ()), | |
ebde6f2d | 7422 | ecs->event_thread->control.step_frame_id)) |
8c95582d | 7423 | { |
ebde6f2d TV |
7424 | /* We are not at the start of a statement, and we have not changed |
7425 | frame. | |
7426 | ||
7427 | We ignore this line table entry, and continue stepping forward, | |
8c95582d AB |
7428 | looking for a better place to stop. */ |
7429 | refresh_step_info = false; | |
1eb8556f SM |
7430 | infrun_debug_printf ("stepped to a different line, but " |
7431 | "it's not the start of a statement"); | |
8c95582d | 7432 | } |
ebde6f2d TV |
7433 | else |
7434 | { | |
7435 | /* We are not the start of a statement, and we have changed frame. | |
7436 | ||
7437 | We ignore this line table entry, and continue stepping forward, | |
7438 | looking for a better place to stop. Keep refresh_step_info at | |
7439 | true to note that the frame has changed, but ignore the line | |
7440 | number to make sure we don't ignore a subsequent entry with the | |
7441 | same line number. */ | |
7442 | stop_pc_sal.line = 0; | |
7443 | infrun_debug_printf ("stepped to a different frame, but " | |
7444 | "it's not the start of a statement"); | |
7445 | } | |
488f131b | 7446 | } |
c906108c | 7447 | |
488f131b | 7448 | /* We aren't done stepping. |
c906108c | 7449 | |
488f131b JB |
7450 | Optimize by setting the stepping range to the line. |
7451 | (We might not be in the original line, but if we entered a | |
7452 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7453 | things like for(;;) statements work better.) |
7454 | ||
7455 | If we entered a SAL that indicates a non-statement line table entry, | |
7456 | then we update the stepping range, but we don't update the step info, | |
7457 | which includes things like the line number we are stepping away from. | |
7458 | This means we will stop when we find a line table entry that is marked | |
7459 | as is-statement, even if it matches the non-statement one we just | |
7460 | stepped into. */ | |
c906108c | 7461 | |
16c381f0 JK |
7462 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7463 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7464 | ecs->event_thread->control.may_range_step = 1; |
8c95582d AB |
7465 | if (refresh_step_info) |
7466 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7467 | |
1eb8556f | 7468 | infrun_debug_printf ("keep going"); |
488f131b | 7469 | keep_going (ecs); |
104c1213 JM |
7470 | } |
7471 | ||
408f6686 PA |
7472 | static bool restart_stepped_thread (process_stratum_target *resume_target, |
7473 | ptid_t resume_ptid); | |
7474 | ||
c447ac0b PA |
7475 | /* In all-stop mode, if we're currently stepping but have stopped in |
7476 | some other thread, we may need to switch back to the stepped | |
7477 | thread. Returns true we set the inferior running, false if we left | |
7478 | it stopped (and the event needs further processing). */ | |
7479 | ||
c4464ade | 7480 | static bool |
c447ac0b PA |
7481 | switch_back_to_stepped_thread (struct execution_control_state *ecs) |
7482 | { | |
fbea99ea | 7483 | if (!target_is_non_stop_p ()) |
c447ac0b | 7484 | { |
99619bea PA |
7485 | /* If any thread is blocked on some internal breakpoint, and we |
7486 | simply need to step over that breakpoint to get it going | |
7487 | again, do that first. */ | |
7488 | ||
7489 | /* However, if we see an event for the stepping thread, then we | |
7490 | know all other threads have been moved past their breakpoints | |
7491 | already. Let the caller check whether the step is finished, | |
7492 | etc., before deciding to move it past a breakpoint. */ | |
7493 | if (ecs->event_thread->control.step_range_end != 0) | |
c4464ade | 7494 | return false; |
99619bea PA |
7495 | |
7496 | /* Check if the current thread is blocked on an incomplete | |
7497 | step-over, interrupted by a random signal. */ | |
7498 | if (ecs->event_thread->control.trap_expected | |
7499 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7500 | { |
1eb8556f SM |
7501 | infrun_debug_printf |
7502 | ("need to finish step-over of [%s]", | |
7503 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
99619bea | 7504 | keep_going (ecs); |
c4464ade | 7505 | return true; |
99619bea | 7506 | } |
2adfaa28 | 7507 | |
99619bea PA |
7508 | /* Check if the current thread is blocked by a single-step |
7509 | breakpoint of another thread. */ | |
7510 | if (ecs->hit_singlestep_breakpoint) | |
7511 | { | |
1eb8556f SM |
7512 | infrun_debug_printf ("need to step [%s] over single-step breakpoint", |
7513 | target_pid_to_str (ecs->ptid).c_str ()); | |
99619bea | 7514 | keep_going (ecs); |
c4464ade | 7515 | return true; |
99619bea PA |
7516 | } |
7517 | ||
4d9d9d04 PA |
7518 | /* If this thread needs yet another step-over (e.g., stepping |
7519 | through a delay slot), do it first before moving on to | |
7520 | another thread. */ | |
7521 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7522 | { | |
1eb8556f SM |
7523 | infrun_debug_printf |
7524 | ("thread [%s] still needs step-over", | |
7525 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
4d9d9d04 | 7526 | keep_going (ecs); |
c4464ade | 7527 | return true; |
4d9d9d04 | 7528 | } |
70509625 | 7529 | |
483805cf PA |
7530 | /* If scheduler locking applies even if not stepping, there's no |
7531 | need to walk over threads. Above we've checked whether the | |
7532 | current thread is stepping. If some other thread not the | |
7533 | event thread is stepping, then it must be that scheduler | |
7534 | locking is not in effect. */ | |
856e7dd6 | 7535 | if (schedlock_applies (ecs->event_thread)) |
c4464ade | 7536 | return false; |
483805cf | 7537 | |
4d9d9d04 PA |
7538 | /* Otherwise, we no longer expect a trap in the current thread. |
7539 | Clear the trap_expected flag before switching back -- this is | |
7540 | what keep_going does as well, if we call it. */ | |
7541 | ecs->event_thread->control.trap_expected = 0; | |
7542 | ||
7543 | /* Likewise, clear the signal if it should not be passed. */ | |
7544 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7545 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7546 | ||
408f6686 | 7547 | if (restart_stepped_thread (ecs->target, ecs->ptid)) |
4d9d9d04 PA |
7548 | { |
7549 | prepare_to_wait (ecs); | |
c4464ade | 7550 | return true; |
4d9d9d04 PA |
7551 | } |
7552 | ||
408f6686 PA |
7553 | switch_to_thread (ecs->event_thread); |
7554 | } | |
4d9d9d04 | 7555 | |
408f6686 PA |
7556 | return false; |
7557 | } | |
f3f8ece4 | 7558 | |
408f6686 PA |
7559 | /* Look for the thread that was stepping, and resume it. |
7560 | RESUME_TARGET / RESUME_PTID indicate the set of threads the caller | |
7561 | is resuming. Return true if a thread was started, false | |
7562 | otherwise. */ | |
483805cf | 7563 | |
408f6686 PA |
7564 | static bool |
7565 | restart_stepped_thread (process_stratum_target *resume_target, | |
7566 | ptid_t resume_ptid) | |
7567 | { | |
7568 | /* Do all pending step-overs before actually proceeding with | |
7569 | step/next/etc. */ | |
7570 | if (start_step_over ()) | |
7571 | return true; | |
483805cf | 7572 | |
408f6686 PA |
7573 | for (thread_info *tp : all_threads_safe ()) |
7574 | { | |
7575 | if (tp->state == THREAD_EXITED) | |
7576 | continue; | |
7577 | ||
7578 | if (tp->suspend.waitstatus_pending_p) | |
7579 | continue; | |
483805cf | 7580 | |
408f6686 PA |
7581 | /* Ignore threads of processes the caller is not |
7582 | resuming. */ | |
7583 | if (!sched_multi | |
7584 | && (tp->inf->process_target () != resume_target | |
7585 | || tp->inf->pid != resume_ptid.pid ())) | |
7586 | continue; | |
483805cf | 7587 | |
408f6686 PA |
7588 | if (tp->control.trap_expected) |
7589 | { | |
7590 | infrun_debug_printf ("switching back to stepped thread (step-over)"); | |
483805cf | 7591 | |
408f6686 PA |
7592 | if (keep_going_stepped_thread (tp)) |
7593 | return true; | |
99619bea | 7594 | } |
408f6686 PA |
7595 | } |
7596 | ||
7597 | for (thread_info *tp : all_threads_safe ()) | |
7598 | { | |
7599 | if (tp->state == THREAD_EXITED) | |
7600 | continue; | |
7601 | ||
7602 | if (tp->suspend.waitstatus_pending_p) | |
7603 | continue; | |
99619bea | 7604 | |
408f6686 PA |
7605 | /* Ignore threads of processes the caller is not |
7606 | resuming. */ | |
7607 | if (!sched_multi | |
7608 | && (tp->inf->process_target () != resume_target | |
7609 | || tp->inf->pid != resume_ptid.pid ())) | |
7610 | continue; | |
7611 | ||
7612 | /* Did we find the stepping thread? */ | |
7613 | if (tp->control.step_range_end) | |
99619bea | 7614 | { |
408f6686 | 7615 | infrun_debug_printf ("switching back to stepped thread (stepping)"); |
c447ac0b | 7616 | |
408f6686 PA |
7617 | if (keep_going_stepped_thread (tp)) |
7618 | return true; | |
2ac7589c PA |
7619 | } |
7620 | } | |
2adfaa28 | 7621 | |
c4464ade | 7622 | return false; |
2ac7589c | 7623 | } |
2adfaa28 | 7624 | |
408f6686 PA |
7625 | /* See infrun.h. */ |
7626 | ||
7627 | void | |
7628 | restart_after_all_stop_detach (process_stratum_target *proc_target) | |
7629 | { | |
7630 | /* Note we don't check target_is_non_stop_p() here, because the | |
7631 | current inferior may no longer have a process_stratum target | |
7632 | pushed, as we just detached. */ | |
7633 | ||
7634 | /* See if we have a THREAD_RUNNING thread that need to be | |
7635 | re-resumed. If we have any thread that is already executing, | |
7636 | then we don't need to resume the target -- it is already been | |
7637 | resumed. With the remote target (in all-stop), it's even | |
7638 | impossible to issue another resumption if the target is already | |
7639 | resumed, until the target reports a stop. */ | |
7640 | for (thread_info *thr : all_threads (proc_target)) | |
7641 | { | |
7642 | if (thr->state != THREAD_RUNNING) | |
7643 | continue; | |
7644 | ||
7645 | /* If we have any thread that is already executing, then we | |
7646 | don't need to resume the target -- it is already been | |
7647 | resumed. */ | |
7648 | if (thr->executing) | |
7649 | return; | |
7650 | ||
7651 | /* If we have a pending event to process, skip resuming the | |
7652 | target and go straight to processing it. */ | |
7653 | if (thr->resumed && thr->suspend.waitstatus_pending_p) | |
7654 | return; | |
7655 | } | |
7656 | ||
7657 | /* Alright, we need to re-resume the target. If a thread was | |
7658 | stepping, we need to restart it stepping. */ | |
7659 | if (restart_stepped_thread (proc_target, minus_one_ptid)) | |
7660 | return; | |
7661 | ||
7662 | /* Otherwise, find the first THREAD_RUNNING thread and resume | |
7663 | it. */ | |
7664 | for (thread_info *thr : all_threads (proc_target)) | |
7665 | { | |
7666 | if (thr->state != THREAD_RUNNING) | |
7667 | continue; | |
7668 | ||
7669 | execution_control_state ecs; | |
7670 | reset_ecs (&ecs, thr); | |
7671 | switch_to_thread (thr); | |
7672 | keep_going (&ecs); | |
7673 | return; | |
7674 | } | |
7675 | } | |
7676 | ||
2ac7589c PA |
7677 | /* Set a previously stepped thread back to stepping. Returns true on |
7678 | success, false if the resume is not possible (e.g., the thread | |
7679 | vanished). */ | |
7680 | ||
c4464ade | 7681 | static bool |
2ac7589c PA |
7682 | keep_going_stepped_thread (struct thread_info *tp) |
7683 | { | |
7684 | struct frame_info *frame; | |
2ac7589c PA |
7685 | struct execution_control_state ecss; |
7686 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7687 | |
2ac7589c PA |
7688 | /* If the stepping thread exited, then don't try to switch back and |
7689 | resume it, which could fail in several different ways depending | |
7690 | on the target. Instead, just keep going. | |
2adfaa28 | 7691 | |
2ac7589c PA |
7692 | We can find a stepping dead thread in the thread list in two |
7693 | cases: | |
2adfaa28 | 7694 | |
2ac7589c PA |
7695 | - The target supports thread exit events, and when the target |
7696 | tries to delete the thread from the thread list, inferior_ptid | |
7697 | pointed at the exiting thread. In such case, calling | |
7698 | delete_thread does not really remove the thread from the list; | |
7699 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7700 | |
2ac7589c PA |
7701 | - The target's debug interface does not support thread exit |
7702 | events, and so we have no idea whatsoever if the previously | |
7703 | stepping thread is still alive. For that reason, we need to | |
7704 | synchronously query the target now. */ | |
2adfaa28 | 7705 | |
00431a78 | 7706 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c | 7707 | { |
1eb8556f SM |
7708 | infrun_debug_printf ("not resuming previously stepped thread, it has " |
7709 | "vanished"); | |
2ac7589c | 7710 | |
00431a78 | 7711 | delete_thread (tp); |
c4464ade | 7712 | return false; |
c447ac0b | 7713 | } |
2ac7589c | 7714 | |
1eb8556f | 7715 | infrun_debug_printf ("resuming previously stepped thread"); |
2ac7589c PA |
7716 | |
7717 | reset_ecs (ecs, tp); | |
00431a78 | 7718 | switch_to_thread (tp); |
2ac7589c | 7719 | |
f2ffa92b | 7720 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 7721 | frame = get_current_frame (); |
2ac7589c PA |
7722 | |
7723 | /* If the PC of the thread we were trying to single-step has | |
7724 | changed, then that thread has trapped or been signaled, but the | |
7725 | event has not been reported to GDB yet. Re-poll the target | |
7726 | looking for this particular thread's event (i.e. temporarily | |
7727 | enable schedlock) by: | |
7728 | ||
7729 | - setting a break at the current PC | |
7730 | - resuming that particular thread, only (by setting trap | |
7731 | expected) | |
7732 | ||
7733 | This prevents us continuously moving the single-step breakpoint | |
7734 | forward, one instruction at a time, overstepping. */ | |
7735 | ||
f2ffa92b | 7736 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
7737 | { |
7738 | ptid_t resume_ptid; | |
7739 | ||
1eb8556f SM |
7740 | infrun_debug_printf ("expected thread advanced also (%s -> %s)", |
7741 | paddress (target_gdbarch (), tp->prev_pc), | |
7742 | paddress (target_gdbarch (), tp->suspend.stop_pc)); | |
2ac7589c PA |
7743 | |
7744 | /* Clear the info of the previous step-over, as it's no longer | |
7745 | valid (if the thread was trying to step over a breakpoint, it | |
7746 | has already succeeded). It's what keep_going would do too, | |
7747 | if we called it. Do this before trying to insert the sss | |
7748 | breakpoint, otherwise if we were previously trying to step | |
7749 | over this exact address in another thread, the breakpoint is | |
7750 | skipped. */ | |
7751 | clear_step_over_info (); | |
7752 | tp->control.trap_expected = 0; | |
7753 | ||
7754 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7755 | get_frame_address_space (frame), | |
f2ffa92b | 7756 | tp->suspend.stop_pc); |
2ac7589c | 7757 | |
719546c4 | 7758 | tp->resumed = true; |
fbea99ea | 7759 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
c4464ade | 7760 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
2ac7589c PA |
7761 | } |
7762 | else | |
7763 | { | |
1eb8556f | 7764 | infrun_debug_printf ("expected thread still hasn't advanced"); |
2ac7589c PA |
7765 | |
7766 | keep_going_pass_signal (ecs); | |
7767 | } | |
c4464ade SM |
7768 | |
7769 | return true; | |
c447ac0b PA |
7770 | } |
7771 | ||
8b061563 PA |
7772 | /* Is thread TP in the middle of (software or hardware) |
7773 | single-stepping? (Note the result of this function must never be | |
7774 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7775 | |
c4464ade | 7776 | static bool |
b3444185 | 7777 | currently_stepping (struct thread_info *tp) |
a7212384 | 7778 | { |
8358c15c JK |
7779 | return ((tp->control.step_range_end |
7780 | && tp->control.step_resume_breakpoint == NULL) | |
7781 | || tp->control.trap_expected | |
af48d08f | 7782 | || tp->stepped_breakpoint |
8358c15c | 7783 | || bpstat_should_step ()); |
a7212384 UW |
7784 | } |
7785 | ||
b2175913 MS |
7786 | /* Inferior has stepped into a subroutine call with source code that |
7787 | we should not step over. Do step to the first line of code in | |
7788 | it. */ | |
c2c6d25f JM |
7789 | |
7790 | static void | |
568d6575 UW |
7791 | handle_step_into_function (struct gdbarch *gdbarch, |
7792 | struct execution_control_state *ecs) | |
c2c6d25f | 7793 | { |
7e324e48 GB |
7794 | fill_in_stop_func (gdbarch, ecs); |
7795 | ||
f2ffa92b PA |
7796 | compunit_symtab *cust |
7797 | = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); | |
43f3e411 | 7798 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7799 | ecs->stop_func_start |
7800 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7801 | |
51abb421 | 7802 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7803 | /* Use the step_resume_break to step until the end of the prologue, |
7804 | even if that involves jumps (as it seems to on the vax under | |
7805 | 4.2). */ | |
7806 | /* If the prologue ends in the middle of a source line, continue to | |
7807 | the end of that source line (if it is still within the function). | |
7808 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7809 | if (stop_func_sal.end |
7810 | && stop_func_sal.pc != ecs->stop_func_start | |
7811 | && stop_func_sal.end < ecs->stop_func_end) | |
7812 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7813 | |
2dbd5e30 KB |
7814 | /* Architectures which require breakpoint adjustment might not be able |
7815 | to place a breakpoint at the computed address. If so, the test | |
7816 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7817 | ecs->stop_func_start to an address at which a breakpoint may be | |
7818 | legitimately placed. | |
8fb3e588 | 7819 | |
2dbd5e30 KB |
7820 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7821 | made, GDB will enter an infinite loop when stepping through | |
7822 | optimized code consisting of VLIW instructions which contain | |
7823 | subinstructions corresponding to different source lines. On | |
7824 | FR-V, it's not permitted to place a breakpoint on any but the | |
7825 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7826 | set, GDB will adjust the breakpoint address to the beginning of | |
7827 | the VLIW instruction. Thus, we need to make the corresponding | |
7828 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7829 | |
568d6575 | 7830 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7831 | { |
7832 | ecs->stop_func_start | |
568d6575 | 7833 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7834 | ecs->stop_func_start); |
2dbd5e30 KB |
7835 | } |
7836 | ||
f2ffa92b | 7837 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7838 | { |
7839 | /* We are already there: stop now. */ | |
bdc36728 | 7840 | end_stepping_range (ecs); |
c2c6d25f JM |
7841 | return; |
7842 | } | |
7843 | else | |
7844 | { | |
7845 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7846 | symtab_and_line sr_sal; |
c2c6d25f JM |
7847 | sr_sal.pc = ecs->stop_func_start; |
7848 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7849 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7850 | |
c2c6d25f | 7851 | /* Do not specify what the fp should be when we stop since on |
dda83cd7 SM |
7852 | some machines the prologue is where the new fp value is |
7853 | established. */ | |
a6d9a66e | 7854 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7855 | |
7856 | /* And make sure stepping stops right away then. */ | |
16c381f0 | 7857 | ecs->event_thread->control.step_range_end |
dda83cd7 | 7858 | = ecs->event_thread->control.step_range_start; |
c2c6d25f JM |
7859 | } |
7860 | keep_going (ecs); | |
7861 | } | |
d4f3574e | 7862 | |
b2175913 MS |
7863 | /* Inferior has stepped backward into a subroutine call with source |
7864 | code that we should not step over. Do step to the beginning of the | |
7865 | last line of code in it. */ | |
7866 | ||
7867 | static void | |
568d6575 UW |
7868 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7869 | struct execution_control_state *ecs) | |
b2175913 | 7870 | { |
43f3e411 | 7871 | struct compunit_symtab *cust; |
167e4384 | 7872 | struct symtab_and_line stop_func_sal; |
b2175913 | 7873 | |
7e324e48 GB |
7874 | fill_in_stop_func (gdbarch, ecs); |
7875 | ||
f2ffa92b | 7876 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7877 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7878 | ecs->stop_func_start |
7879 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7880 | |
f2ffa92b | 7881 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7882 | |
7883 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7884 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7885 | { |
7886 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7887 | end_stepping_range (ecs); |
b2175913 MS |
7888 | } |
7889 | else | |
7890 | { | |
7891 | /* Else just reset the step range and keep going. | |
7892 | No step-resume breakpoint, they don't work for | |
7893 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7894 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7895 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7896 | keep_going (ecs); |
7897 | } | |
7898 | return; | |
7899 | } | |
7900 | ||
d3169d93 | 7901 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7902 | This is used to both functions and to skip over code. */ |
7903 | ||
7904 | static void | |
2c03e5be PA |
7905 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7906 | struct symtab_and_line sr_sal, | |
7907 | struct frame_id sr_id, | |
7908 | enum bptype sr_type) | |
44cbf7b5 | 7909 | { |
611c83ae PA |
7910 | /* There should never be more than one step-resume or longjmp-resume |
7911 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7912 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7913 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7914 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 | 7915 | |
1eb8556f SM |
7916 | infrun_debug_printf ("inserting step-resume breakpoint at %s", |
7917 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7918 | |
8358c15c | 7919 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7920 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7921 | } |
7922 | ||
9da8c2a0 | 7923 | void |
2c03e5be PA |
7924 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7925 | struct symtab_and_line sr_sal, | |
7926 | struct frame_id sr_id) | |
7927 | { | |
7928 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7929 | sr_sal, sr_id, | |
7930 | bp_step_resume); | |
44cbf7b5 | 7931 | } |
7ce450bd | 7932 | |
2c03e5be PA |
7933 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7934 | This is used to skip a potential signal handler. | |
7ce450bd | 7935 | |
14e60db5 DJ |
7936 | This is called with the interrupted function's frame. The signal |
7937 | handler, when it returns, will resume the interrupted function at | |
7938 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7939 | |
7940 | static void | |
2c03e5be | 7941 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7942 | { |
f4c1edd8 | 7943 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7944 | |
51abb421 PA |
7945 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7946 | ||
7947 | symtab_and_line sr_sal; | |
568d6575 | 7948 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7949 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7950 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7951 | |
2c03e5be PA |
7952 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7953 | get_stack_frame_id (return_frame), | |
7954 | bp_hp_step_resume); | |
d303a6c7 AC |
7955 | } |
7956 | ||
2c03e5be PA |
7957 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7958 | is used to skip a function after stepping into it (for "next" or if | |
7959 | the called function has no debugging information). | |
14e60db5 DJ |
7960 | |
7961 | The current function has almost always been reached by single | |
7962 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7963 | current function, and the breakpoint will be set at the caller's | |
7964 | resume address. | |
7965 | ||
7966 | This is a separate function rather than reusing | |
2c03e5be | 7967 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7968 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7969 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7970 | |
7971 | static void | |
7972 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7973 | { | |
14e60db5 DJ |
7974 | /* We shouldn't have gotten here if we don't know where the call site |
7975 | is. */ | |
c7ce8faa | 7976 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7977 | |
51abb421 | 7978 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7979 | |
51abb421 | 7980 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7981 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7982 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7983 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7984 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7985 | |
a6d9a66e | 7986 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7987 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7988 | } |
7989 | ||
611c83ae PA |
7990 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7991 | new breakpoint at the target of a jmp_buf. The handling of | |
7992 | longjmp-resume uses the same mechanisms used for handling | |
7993 | "step-resume" breakpoints. */ | |
7994 | ||
7995 | static void | |
a6d9a66e | 7996 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7997 | { |
e81a37f7 TT |
7998 | /* There should never be more than one longjmp-resume breakpoint per |
7999 | thread, so we should never be setting a new | |
611c83ae | 8000 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 8001 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae | 8002 | |
1eb8556f SM |
8003 | infrun_debug_printf ("inserting longjmp-resume breakpoint at %s", |
8004 | paddress (gdbarch, pc)); | |
611c83ae | 8005 | |
e81a37f7 | 8006 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 8007 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
8008 | } |
8009 | ||
186c406b TT |
8010 | /* Insert an exception resume breakpoint. TP is the thread throwing |
8011 | the exception. The block B is the block of the unwinder debug hook | |
8012 | function. FRAME is the frame corresponding to the call to this | |
8013 | function. SYM is the symbol of the function argument holding the | |
8014 | target PC of the exception. */ | |
8015 | ||
8016 | static void | |
8017 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 8018 | const struct block *b, |
186c406b TT |
8019 | struct frame_info *frame, |
8020 | struct symbol *sym) | |
8021 | { | |
a70b8144 | 8022 | try |
186c406b | 8023 | { |
63e43d3a | 8024 | struct block_symbol vsym; |
186c406b TT |
8025 | struct value *value; |
8026 | CORE_ADDR handler; | |
8027 | struct breakpoint *bp; | |
8028 | ||
987012b8 | 8029 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 8030 | b, VAR_DOMAIN); |
63e43d3a | 8031 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
8032 | /* If the value was optimized out, revert to the old behavior. */ |
8033 | if (! value_optimized_out (value)) | |
8034 | { | |
8035 | handler = value_as_address (value); | |
8036 | ||
1eb8556f SM |
8037 | infrun_debug_printf ("exception resume at %lx", |
8038 | (unsigned long) handler); | |
186c406b TT |
8039 | |
8040 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
8041 | handler, |
8042 | bp_exception_resume).release (); | |
c70a6932 JK |
8043 | |
8044 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
8045 | frame = NULL; | |
8046 | ||
5d5658a1 | 8047 | bp->thread = tp->global_num; |
186c406b TT |
8048 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
8049 | } | |
8050 | } | |
230d2906 | 8051 | catch (const gdb_exception_error &e) |
492d29ea PA |
8052 | { |
8053 | /* We want to ignore errors here. */ | |
8054 | } | |
186c406b TT |
8055 | } |
8056 | ||
28106bc2 SDJ |
8057 | /* A helper for check_exception_resume that sets an |
8058 | exception-breakpoint based on a SystemTap probe. */ | |
8059 | ||
8060 | static void | |
8061 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 8062 | const struct bound_probe *probe, |
28106bc2 SDJ |
8063 | struct frame_info *frame) |
8064 | { | |
8065 | struct value *arg_value; | |
8066 | CORE_ADDR handler; | |
8067 | struct breakpoint *bp; | |
8068 | ||
8069 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
8070 | if (!arg_value) | |
8071 | return; | |
8072 | ||
8073 | handler = value_as_address (arg_value); | |
8074 | ||
1eb8556f SM |
8075 | infrun_debug_printf ("exception resume at %s", |
8076 | paddress (probe->objfile->arch (), handler)); | |
28106bc2 SDJ |
8077 | |
8078 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 8079 | handler, bp_exception_resume).release (); |
5d5658a1 | 8080 | bp->thread = tp->global_num; |
28106bc2 SDJ |
8081 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
8082 | } | |
8083 | ||
186c406b TT |
8084 | /* This is called when an exception has been intercepted. Check to |
8085 | see whether the exception's destination is of interest, and if so, | |
8086 | set an exception resume breakpoint there. */ | |
8087 | ||
8088 | static void | |
8089 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 8090 | struct frame_info *frame) |
186c406b | 8091 | { |
729662a5 | 8092 | struct bound_probe probe; |
28106bc2 SDJ |
8093 | struct symbol *func; |
8094 | ||
8095 | /* First see if this exception unwinding breakpoint was set via a | |
8096 | SystemTap probe point. If so, the probe has two arguments: the | |
8097 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
8098 | set a breakpoint there. */ | |
6bac7473 | 8099 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 8100 | if (probe.prob) |
28106bc2 | 8101 | { |
729662a5 | 8102 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
8103 | return; |
8104 | } | |
8105 | ||
8106 | func = get_frame_function (frame); | |
8107 | if (!func) | |
8108 | return; | |
186c406b | 8109 | |
a70b8144 | 8110 | try |
186c406b | 8111 | { |
3977b71f | 8112 | const struct block *b; |
8157b174 | 8113 | struct block_iterator iter; |
186c406b TT |
8114 | struct symbol *sym; |
8115 | int argno = 0; | |
8116 | ||
8117 | /* The exception breakpoint is a thread-specific breakpoint on | |
8118 | the unwinder's debug hook, declared as: | |
8119 | ||
8120 | void _Unwind_DebugHook (void *cfa, void *handler); | |
8121 | ||
8122 | The CFA argument indicates the frame to which control is | |
8123 | about to be transferred. HANDLER is the destination PC. | |
8124 | ||
8125 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
8126 | This is not extremely efficient but it avoids issues in gdb | |
8127 | with computing the DWARF CFA, and it also works even in weird | |
8128 | cases such as throwing an exception from inside a signal | |
8129 | handler. */ | |
8130 | ||
8131 | b = SYMBOL_BLOCK_VALUE (func); | |
8132 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
8133 | { | |
8134 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
8135 | continue; | |
8136 | ||
8137 | if (argno == 0) | |
8138 | ++argno; | |
8139 | else | |
8140 | { | |
8141 | insert_exception_resume_breakpoint (ecs->event_thread, | |
8142 | b, frame, sym); | |
8143 | break; | |
8144 | } | |
8145 | } | |
8146 | } | |
230d2906 | 8147 | catch (const gdb_exception_error &e) |
492d29ea PA |
8148 | { |
8149 | } | |
186c406b TT |
8150 | } |
8151 | ||
104c1213 | 8152 | static void |
22bcd14b | 8153 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 8154 | { |
1eb8556f | 8155 | infrun_debug_printf ("stop_waiting"); |
527159b7 | 8156 | |
cd0fc7c3 SS |
8157 | /* Let callers know we don't want to wait for the inferior anymore. */ |
8158 | ecs->wait_some_more = 0; | |
fbea99ea | 8159 | |
53cccef1 | 8160 | /* If all-stop, but there exists a non-stop target, stop all |
fbea99ea | 8161 | threads now that we're presenting the stop to the user. */ |
53cccef1 | 8162 | if (!non_stop && exists_non_stop_target ()) |
2bf06f96 | 8163 | stop_all_threads ("presenting stop to user in all-stop"); |
cd0fc7c3 SS |
8164 | } |
8165 | ||
4d9d9d04 PA |
8166 | /* Like keep_going, but passes the signal to the inferior, even if the |
8167 | signal is set to nopass. */ | |
d4f3574e SS |
8168 | |
8169 | static void | |
4d9d9d04 | 8170 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 8171 | { |
d7e15655 | 8172 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 8173 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 8174 | |
d4f3574e | 8175 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 8176 | ecs->event_thread->prev_pc |
fc75c28b | 8177 | = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 8178 | |
4d9d9d04 | 8179 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 8180 | { |
4d9d9d04 PA |
8181 | struct thread_info *tp = ecs->event_thread; |
8182 | ||
1eb8556f SM |
8183 | infrun_debug_printf ("%s has trap_expected set, " |
8184 | "resuming to collect trap", | |
8185 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 | 8186 | |
a9ba6bae PA |
8187 | /* We haven't yet gotten our trap, and either: intercepted a |
8188 | non-signal event (e.g., a fork); or took a signal which we | |
8189 | are supposed to pass through to the inferior. Simply | |
8190 | continue. */ | |
64ce06e4 | 8191 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 8192 | } |
372316f1 PA |
8193 | else if (step_over_info_valid_p ()) |
8194 | { | |
8195 | /* Another thread is stepping over a breakpoint in-line. If | |
8196 | this thread needs a step-over too, queue the request. In | |
8197 | either case, this resume must be deferred for later. */ | |
8198 | struct thread_info *tp = ecs->event_thread; | |
8199 | ||
8200 | if (ecs->hit_singlestep_breakpoint | |
8201 | || thread_still_needs_step_over (tp)) | |
8202 | { | |
1eb8556f SM |
8203 | infrun_debug_printf ("step-over already in progress: " |
8204 | "step-over for %s deferred", | |
8205 | target_pid_to_str (tp->ptid).c_str ()); | |
28d5518b | 8206 | global_thread_step_over_chain_enqueue (tp); |
372316f1 PA |
8207 | } |
8208 | else | |
8209 | { | |
1eb8556f SM |
8210 | infrun_debug_printf ("step-over in progress: resume of %s deferred", |
8211 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 8212 | } |
372316f1 | 8213 | } |
d4f3574e SS |
8214 | else |
8215 | { | |
31e77af2 | 8216 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
8217 | int remove_bp; |
8218 | int remove_wps; | |
8d297bbf | 8219 | step_over_what step_what; |
31e77af2 | 8220 | |
d4f3574e | 8221 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
8222 | anyway (if we got a signal, the user asked it be passed to |
8223 | the child) | |
8224 | -- or -- | |
8225 | We got our expected trap, but decided we should resume from | |
8226 | it. | |
d4f3574e | 8227 | |
a9ba6bae | 8228 | We're going to run this baby now! |
d4f3574e | 8229 | |
c36b740a VP |
8230 | Note that insert_breakpoints won't try to re-insert |
8231 | already inserted breakpoints. Therefore, we don't | |
8232 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 8233 | |
31e77af2 PA |
8234 | /* If we need to step over a breakpoint, and we're not using |
8235 | displaced stepping to do so, insert all breakpoints | |
8236 | (watchpoints, etc.) but the one we're stepping over, step one | |
8237 | instruction, and then re-insert the breakpoint when that step | |
8238 | is finished. */ | |
963f9c80 | 8239 | |
6c4cfb24 PA |
8240 | step_what = thread_still_needs_step_over (ecs->event_thread); |
8241 | ||
963f9c80 | 8242 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
8243 | || (step_what & STEP_OVER_BREAKPOINT)); |
8244 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 8245 | |
cb71640d PA |
8246 | /* We can't use displaced stepping if we need to step past a |
8247 | watchpoint. The instruction copied to the scratch pad would | |
8248 | still trigger the watchpoint. */ | |
8249 | if (remove_bp | |
3fc8eb30 | 8250 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 8251 | { |
a01bda52 | 8252 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
8253 | regcache_read_pc (regcache), remove_wps, |
8254 | ecs->event_thread->global_num); | |
45e8c884 | 8255 | } |
963f9c80 | 8256 | else if (remove_wps) |
21edc42f | 8257 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
8258 | |
8259 | /* If we now need to do an in-line step-over, we need to stop | |
8260 | all other threads. Note this must be done before | |
8261 | insert_breakpoints below, because that removes the breakpoint | |
8262 | we're about to step over, otherwise other threads could miss | |
8263 | it. */ | |
fbea99ea | 8264 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
2bf06f96 | 8265 | stop_all_threads ("starting in-line step-over"); |
abbb1732 | 8266 | |
31e77af2 | 8267 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 8268 | try |
31e77af2 PA |
8269 | { |
8270 | insert_breakpoints (); | |
8271 | } | |
230d2906 | 8272 | catch (const gdb_exception_error &e) |
31e77af2 PA |
8273 | { |
8274 | exception_print (gdb_stderr, e); | |
22bcd14b | 8275 | stop_waiting (ecs); |
bdf2a94a | 8276 | clear_step_over_info (); |
31e77af2 | 8277 | return; |
d4f3574e SS |
8278 | } |
8279 | ||
963f9c80 | 8280 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 8281 | |
64ce06e4 | 8282 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
8283 | } |
8284 | ||
488f131b | 8285 | prepare_to_wait (ecs); |
d4f3574e SS |
8286 | } |
8287 | ||
4d9d9d04 PA |
8288 | /* Called when we should continue running the inferior, because the |
8289 | current event doesn't cause a user visible stop. This does the | |
8290 | resuming part; waiting for the next event is done elsewhere. */ | |
8291 | ||
8292 | static void | |
8293 | keep_going (struct execution_control_state *ecs) | |
8294 | { | |
8295 | if (ecs->event_thread->control.trap_expected | |
8296 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
8297 | ecs->event_thread->control.trap_expected = 0; | |
8298 | ||
8299 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
8300 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
8301 | keep_going_pass_signal (ecs); | |
8302 | } | |
8303 | ||
104c1213 JM |
8304 | /* This function normally comes after a resume, before |
8305 | handle_inferior_event exits. It takes care of any last bits of | |
8306 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 8307 | |
104c1213 JM |
8308 | static void |
8309 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 8310 | { |
1eb8556f | 8311 | infrun_debug_printf ("prepare_to_wait"); |
104c1213 | 8312 | |
104c1213 | 8313 | ecs->wait_some_more = 1; |
0b333c5e | 8314 | |
42bd97a6 PA |
8315 | /* If the target can't async, emulate it by marking the infrun event |
8316 | handler such that as soon as we get back to the event-loop, we | |
8317 | immediately end up in fetch_inferior_event again calling | |
8318 | target_wait. */ | |
8319 | if (!target_can_async_p ()) | |
0b333c5e | 8320 | mark_infrun_async_event_handler (); |
c906108c | 8321 | } |
11cf8741 | 8322 | |
fd664c91 | 8323 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 8324 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
8325 | |
8326 | static void | |
bdc36728 | 8327 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 8328 | { |
bdc36728 | 8329 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 8330 | stop_waiting (ecs); |
fd664c91 PA |
8331 | } |
8332 | ||
33d62d64 JK |
8333 | /* Several print_*_reason functions to print why the inferior has stopped. |
8334 | We always print something when the inferior exits, or receives a signal. | |
8335 | The rest of the cases are dealt with later on in normal_stop and | |
8336 | print_it_typical. Ideally there should be a call to one of these | |
8337 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 8338 | stop_waiting is called. |
33d62d64 | 8339 | |
fd664c91 PA |
8340 | Note that we don't call these directly, instead we delegate that to |
8341 | the interpreters, through observers. Interpreters then call these | |
8342 | with whatever uiout is right. */ | |
33d62d64 | 8343 | |
fd664c91 PA |
8344 | void |
8345 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 8346 | { |
fd664c91 | 8347 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 8348 | |
112e8700 | 8349 | if (uiout->is_mi_like_p ()) |
fd664c91 | 8350 | { |
112e8700 | 8351 | uiout->field_string ("reason", |
fd664c91 PA |
8352 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
8353 | } | |
8354 | } | |
33d62d64 | 8355 | |
fd664c91 PA |
8356 | void |
8357 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 8358 | { |
33d62d64 | 8359 | annotate_signalled (); |
112e8700 SM |
8360 | if (uiout->is_mi_like_p ()) |
8361 | uiout->field_string | |
8362 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8363 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 8364 | annotate_signal_name (); |
112e8700 | 8365 | uiout->field_string ("signal-name", |
2ea28649 | 8366 | gdb_signal_to_name (siggnal)); |
33d62d64 | 8367 | annotate_signal_name_end (); |
112e8700 | 8368 | uiout->text (", "); |
33d62d64 | 8369 | annotate_signal_string (); |
112e8700 | 8370 | uiout->field_string ("signal-meaning", |
2ea28649 | 8371 | gdb_signal_to_string (siggnal)); |
33d62d64 | 8372 | annotate_signal_string_end (); |
112e8700 SM |
8373 | uiout->text (".\n"); |
8374 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
8375 | } |
8376 | ||
fd664c91 PA |
8377 | void |
8378 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 8379 | { |
fda326dd | 8380 | struct inferior *inf = current_inferior (); |
a068643d | 8381 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 8382 | |
33d62d64 JK |
8383 | annotate_exited (exitstatus); |
8384 | if (exitstatus) | |
8385 | { | |
112e8700 SM |
8386 | if (uiout->is_mi_like_p ()) |
8387 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
8388 | std::string exit_code_str |
8389 | = string_printf ("0%o", (unsigned int) exitstatus); | |
8390 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
8391 | plongest (inf->num), pidstr.c_str (), | |
8392 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
8393 | } |
8394 | else | |
11cf8741 | 8395 | { |
112e8700 SM |
8396 | if (uiout->is_mi_like_p ()) |
8397 | uiout->field_string | |
8398 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
8399 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
8400 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 8401 | } |
33d62d64 JK |
8402 | } |
8403 | ||
fd664c91 PA |
8404 | void |
8405 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 8406 | { |
f303dbd6 PA |
8407 | struct thread_info *thr = inferior_thread (); |
8408 | ||
33d62d64 JK |
8409 | annotate_signal (); |
8410 | ||
112e8700 | 8411 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
8412 | ; |
8413 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 8414 | { |
f303dbd6 | 8415 | const char *name; |
33d62d64 | 8416 | |
112e8700 | 8417 | uiout->text ("\nThread "); |
33eca680 | 8418 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 PA |
8419 | |
8420 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
8421 | if (name != NULL) | |
8422 | { | |
112e8700 | 8423 | uiout->text (" \""); |
33eca680 | 8424 | uiout->field_string ("name", name); |
112e8700 | 8425 | uiout->text ("\""); |
f303dbd6 | 8426 | } |
33d62d64 | 8427 | } |
f303dbd6 | 8428 | else |
112e8700 | 8429 | uiout->text ("\nProgram"); |
f303dbd6 | 8430 | |
112e8700 SM |
8431 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8432 | uiout->text (" stopped"); | |
33d62d64 JK |
8433 | else |
8434 | { | |
112e8700 | 8435 | uiout->text (" received signal "); |
8b93c638 | 8436 | annotate_signal_name (); |
112e8700 SM |
8437 | if (uiout->is_mi_like_p ()) |
8438 | uiout->field_string | |
8439 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8440 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8441 | annotate_signal_name_end (); |
112e8700 | 8442 | uiout->text (", "); |
8b93c638 | 8443 | annotate_signal_string (); |
112e8700 | 8444 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 | 8445 | |
272bb05c JB |
8446 | struct regcache *regcache = get_current_regcache (); |
8447 | struct gdbarch *gdbarch = regcache->arch (); | |
8448 | if (gdbarch_report_signal_info_p (gdbarch)) | |
8449 | gdbarch_report_signal_info (gdbarch, uiout, siggnal); | |
8450 | ||
8b93c638 | 8451 | annotate_signal_string_end (); |
33d62d64 | 8452 | } |
112e8700 | 8453 | uiout->text (".\n"); |
33d62d64 | 8454 | } |
252fbfc8 | 8455 | |
fd664c91 PA |
8456 | void |
8457 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8458 | { |
112e8700 | 8459 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8460 | } |
43ff13b4 | 8461 | |
0c7e1a46 PA |
8462 | /* Print current location without a level number, if we have changed |
8463 | functions or hit a breakpoint. Print source line if we have one. | |
8464 | bpstat_print contains the logic deciding in detail what to print, | |
8465 | based on the event(s) that just occurred. */ | |
8466 | ||
243a9253 PA |
8467 | static void |
8468 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8469 | { |
8470 | int bpstat_ret; | |
f486487f | 8471 | enum print_what source_flag; |
0c7e1a46 PA |
8472 | int do_frame_printing = 1; |
8473 | struct thread_info *tp = inferior_thread (); | |
8474 | ||
8475 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8476 | switch (bpstat_ret) | |
8477 | { | |
8478 | case PRINT_UNKNOWN: | |
8479 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8480 | should) carry around the function and does (or should) use | |
8481 | that when doing a frame comparison. */ | |
8482 | if (tp->control.stop_step | |
8483 | && frame_id_eq (tp->control.step_frame_id, | |
8484 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
8485 | && (tp->control.step_start_function |
8486 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
8487 | { |
8488 | /* Finished step, just print source line. */ | |
8489 | source_flag = SRC_LINE; | |
8490 | } | |
8491 | else | |
8492 | { | |
8493 | /* Print location and source line. */ | |
8494 | source_flag = SRC_AND_LOC; | |
8495 | } | |
8496 | break; | |
8497 | case PRINT_SRC_AND_LOC: | |
8498 | /* Print location and source line. */ | |
8499 | source_flag = SRC_AND_LOC; | |
8500 | break; | |
8501 | case PRINT_SRC_ONLY: | |
8502 | source_flag = SRC_LINE; | |
8503 | break; | |
8504 | case PRINT_NOTHING: | |
8505 | /* Something bogus. */ | |
8506 | source_flag = SRC_LINE; | |
8507 | do_frame_printing = 0; | |
8508 | break; | |
8509 | default: | |
8510 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8511 | } | |
8512 | ||
8513 | /* The behavior of this routine with respect to the source | |
8514 | flag is: | |
8515 | SRC_LINE: Print only source line | |
8516 | LOCATION: Print only location | |
8517 | SRC_AND_LOC: Print location and source line. */ | |
8518 | if (do_frame_printing) | |
8519 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8520 | } |
8521 | ||
243a9253 PA |
8522 | /* See infrun.h. */ |
8523 | ||
8524 | void | |
4c7d57e7 | 8525 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8526 | { |
243a9253 | 8527 | struct target_waitstatus last; |
243a9253 PA |
8528 | struct thread_info *tp; |
8529 | ||
5b6d1e4f | 8530 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8531 | |
67ad9399 TT |
8532 | { |
8533 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8534 | |
67ad9399 | 8535 | print_stop_location (&last); |
243a9253 | 8536 | |
67ad9399 | 8537 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8538 | if (displays) |
8539 | do_displays (); | |
67ad9399 | 8540 | } |
243a9253 PA |
8541 | |
8542 | tp = inferior_thread (); | |
8543 | if (tp->thread_fsm != NULL | |
46e3ed7f | 8544 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
8545 | { |
8546 | struct return_value_info *rv; | |
8547 | ||
46e3ed7f | 8548 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
8549 | if (rv != NULL) |
8550 | print_return_value (uiout, rv); | |
8551 | } | |
0c7e1a46 PA |
8552 | } |
8553 | ||
388a7084 PA |
8554 | /* See infrun.h. */ |
8555 | ||
8556 | void | |
8557 | maybe_remove_breakpoints (void) | |
8558 | { | |
55f6301a | 8559 | if (!breakpoints_should_be_inserted_now () && target_has_execution ()) |
388a7084 PA |
8560 | { |
8561 | if (remove_breakpoints ()) | |
8562 | { | |
223ffa71 | 8563 | target_terminal::ours_for_output (); |
388a7084 PA |
8564 | printf_filtered (_("Cannot remove breakpoints because " |
8565 | "program is no longer writable.\nFurther " | |
8566 | "execution is probably impossible.\n")); | |
8567 | } | |
8568 | } | |
8569 | } | |
8570 | ||
4c2f2a79 PA |
8571 | /* The execution context that just caused a normal stop. */ |
8572 | ||
8573 | struct stop_context | |
8574 | { | |
2d844eaf | 8575 | stop_context (); |
2d844eaf TT |
8576 | |
8577 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8578 | ||
8579 | bool changed () const; | |
8580 | ||
4c2f2a79 PA |
8581 | /* The stop ID. */ |
8582 | ULONGEST stop_id; | |
c906108c | 8583 | |
4c2f2a79 | 8584 | /* The event PTID. */ |
c906108c | 8585 | |
4c2f2a79 PA |
8586 | ptid_t ptid; |
8587 | ||
8588 | /* If stopp for a thread event, this is the thread that caused the | |
8589 | stop. */ | |
d634cd0b | 8590 | thread_info_ref thread; |
4c2f2a79 PA |
8591 | |
8592 | /* The inferior that caused the stop. */ | |
8593 | int inf_num; | |
8594 | }; | |
8595 | ||
2d844eaf | 8596 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8597 | takes a strong reference to the thread. */ |
8598 | ||
2d844eaf | 8599 | stop_context::stop_context () |
4c2f2a79 | 8600 | { |
2d844eaf TT |
8601 | stop_id = get_stop_id (); |
8602 | ptid = inferior_ptid; | |
8603 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8604 | |
d7e15655 | 8605 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8606 | { |
8607 | /* Take a strong reference so that the thread can't be deleted | |
8608 | yet. */ | |
d634cd0b | 8609 | thread = thread_info_ref::new_reference (inferior_thread ()); |
4c2f2a79 | 8610 | } |
4c2f2a79 PA |
8611 | } |
8612 | ||
8613 | /* Return true if the current context no longer matches the saved stop | |
8614 | context. */ | |
8615 | ||
2d844eaf TT |
8616 | bool |
8617 | stop_context::changed () const | |
8618 | { | |
8619 | if (ptid != inferior_ptid) | |
8620 | return true; | |
8621 | if (inf_num != current_inferior ()->num) | |
8622 | return true; | |
8623 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8624 | return true; | |
8625 | if (get_stop_id () != stop_id) | |
8626 | return true; | |
8627 | return false; | |
4c2f2a79 PA |
8628 | } |
8629 | ||
8630 | /* See infrun.h. */ | |
8631 | ||
8632 | int | |
96baa820 | 8633 | normal_stop (void) |
c906108c | 8634 | { |
73b65bb0 | 8635 | struct target_waitstatus last; |
73b65bb0 | 8636 | |
5b6d1e4f | 8637 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8638 | |
4c2f2a79 PA |
8639 | new_stop_id (); |
8640 | ||
29f49a6a PA |
8641 | /* If an exception is thrown from this point on, make sure to |
8642 | propagate GDB's knowledge of the executing state to the | |
8643 | frontend/user running state. A QUIT is an easy exception to see | |
8644 | here, so do this before any filtered output. */ | |
731f534f | 8645 | |
5b6d1e4f | 8646 | ptid_t finish_ptid = null_ptid; |
731f534f | 8647 | |
c35b1492 | 8648 | if (!non_stop) |
5b6d1e4f | 8649 | finish_ptid = minus_one_ptid; |
e1316e60 PA |
8650 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8651 | || last.kind == TARGET_WAITKIND_EXITED) | |
8652 | { | |
8653 | /* On some targets, we may still have live threads in the | |
8654 | inferior when we get a process exit event. E.g., for | |
8655 | "checkpoint", when the current checkpoint/fork exits, | |
8656 | linux-fork.c automatically switches to another fork from | |
8657 | within target_mourn_inferior. */ | |
731f534f | 8658 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8659 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 PA |
8660 | } |
8661 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5b6d1e4f PA |
8662 | finish_ptid = inferior_ptid; |
8663 | ||
8664 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8665 | if (finish_ptid != null_ptid) | |
8666 | { | |
8667 | maybe_finish_thread_state.emplace | |
8668 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8669 | } | |
29f49a6a | 8670 | |
b57bacec PA |
8671 | /* As we're presenting a stop, and potentially removing breakpoints, |
8672 | update the thread list so we can tell whether there are threads | |
8673 | running on the target. With target remote, for example, we can | |
8674 | only learn about new threads when we explicitly update the thread | |
8675 | list. Do this before notifying the interpreters about signal | |
8676 | stops, end of stepping ranges, etc., so that the "new thread" | |
8677 | output is emitted before e.g., "Program received signal FOO", | |
8678 | instead of after. */ | |
8679 | update_thread_list (); | |
8680 | ||
8681 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 8682 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 8683 | |
c906108c SS |
8684 | /* As with the notification of thread events, we want to delay |
8685 | notifying the user that we've switched thread context until | |
8686 | the inferior actually stops. | |
8687 | ||
73b65bb0 DJ |
8688 | There's no point in saying anything if the inferior has exited. |
8689 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8690 | "received a signal". |
8691 | ||
8692 | Also skip saying anything in non-stop mode. In that mode, as we | |
8693 | don't want GDB to switch threads behind the user's back, to avoid | |
8694 | races where the user is typing a command to apply to thread x, | |
8695 | but GDB switches to thread y before the user finishes entering | |
8696 | the command, fetch_inferior_event installs a cleanup to restore | |
8697 | the current thread back to the thread the user had selected right | |
8698 | after this event is handled, so we're not really switching, only | |
8699 | informing of a stop. */ | |
4f8d22e3 | 8700 | if (!non_stop |
731f534f | 8701 | && previous_inferior_ptid != inferior_ptid |
55f6301a | 8702 | && target_has_execution () |
73b65bb0 | 8703 | && last.kind != TARGET_WAITKIND_SIGNALLED |
0e5bf2a8 PA |
8704 | && last.kind != TARGET_WAITKIND_EXITED |
8705 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8706 | { |
0e454242 | 8707 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8708 | { |
223ffa71 | 8709 | target_terminal::ours_for_output (); |
3b12939d | 8710 | printf_filtered (_("[Switching to %s]\n"), |
a068643d | 8711 | target_pid_to_str (inferior_ptid).c_str ()); |
3b12939d PA |
8712 | annotate_thread_changed (); |
8713 | } | |
39f77062 | 8714 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8715 | } |
c906108c | 8716 | |
0e5bf2a8 PA |
8717 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8718 | { | |
0e454242 | 8719 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8720 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8721 | { | |
223ffa71 | 8722 | target_terminal::ours_for_output (); |
3b12939d PA |
8723 | printf_filtered (_("No unwaited-for children left.\n")); |
8724 | } | |
0e5bf2a8 PA |
8725 | } |
8726 | ||
b57bacec | 8727 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8728 | maybe_remove_breakpoints (); |
c906108c | 8729 | |
c906108c SS |
8730 | /* If an auto-display called a function and that got a signal, |
8731 | delete that auto-display to avoid an infinite recursion. */ | |
8732 | ||
8733 | if (stopped_by_random_signal) | |
8734 | disable_current_display (); | |
8735 | ||
0e454242 | 8736 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8737 | { |
8738 | async_enable_stdin (); | |
8739 | } | |
c906108c | 8740 | |
388a7084 | 8741 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8742 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8743 | |
8744 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8745 | and current location is based on that. Handle the case where the | |
8746 | dummy call is returning after being stopped. E.g. the dummy call | |
8747 | previously hit a breakpoint. (If the dummy call returns | |
8748 | normally, we won't reach here.) Do this before the stop hook is | |
8749 | run, so that it doesn't get to see the temporary dummy frame, | |
8750 | which is not where we'll present the stop. */ | |
8751 | if (has_stack_frames ()) | |
8752 | { | |
8753 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8754 | { | |
8755 | /* Pop the empty frame that contains the stack dummy. This | |
8756 | also restores inferior state prior to the call (struct | |
8757 | infcall_suspend_state). */ | |
8758 | struct frame_info *frame = get_current_frame (); | |
8759 | ||
8760 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8761 | frame_pop (frame); | |
8762 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8763 | does which means there's now no selected frame. */ | |
8764 | } | |
8765 | ||
8766 | select_frame (get_current_frame ()); | |
8767 | ||
8768 | /* Set the current source location. */ | |
8769 | set_current_sal_from_frame (get_current_frame ()); | |
8770 | } | |
dd7e2d2b PA |
8771 | |
8772 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8773 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8774 | if (stop_command != NULL) |
8775 | { | |
2d844eaf | 8776 | stop_context saved_context; |
4c2f2a79 | 8777 | |
a70b8144 | 8778 | try |
bf469271 PA |
8779 | { |
8780 | execute_cmd_pre_hook (stop_command); | |
8781 | } | |
230d2906 | 8782 | catch (const gdb_exception &ex) |
bf469271 PA |
8783 | { |
8784 | exception_fprintf (gdb_stderr, ex, | |
8785 | "Error while running hook_stop:\n"); | |
8786 | } | |
4c2f2a79 PA |
8787 | |
8788 | /* If the stop hook resumes the target, then there's no point in | |
8789 | trying to notify about the previous stop; its context is | |
8790 | gone. Likewise if the command switches thread or inferior -- | |
8791 | the observers would print a stop for the wrong | |
8792 | thread/inferior. */ | |
2d844eaf TT |
8793 | if (saved_context.changed ()) |
8794 | return 1; | |
4c2f2a79 | 8795 | } |
dd7e2d2b | 8796 | |
388a7084 PA |
8797 | /* Notify observers about the stop. This is where the interpreters |
8798 | print the stop event. */ | |
d7e15655 | 8799 | if (inferior_ptid != null_ptid) |
76727919 | 8800 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
24a7f1b5 | 8801 | stop_print_frame); |
388a7084 | 8802 | else |
76727919 | 8803 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8804 | |
243a9253 PA |
8805 | annotate_stopped (); |
8806 | ||
55f6301a | 8807 | if (target_has_execution ()) |
48844aa6 PA |
8808 | { |
8809 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
fe726667 PA |
8810 | && last.kind != TARGET_WAITKIND_EXITED |
8811 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8812 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8813 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8814 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8815 | } |
6c95b8df PA |
8816 | |
8817 | /* Try to get rid of automatically added inferiors that are no | |
8818 | longer needed. Keeping those around slows down things linearly. | |
8819 | Note that this never removes the current inferior. */ | |
8820 | prune_inferiors (); | |
4c2f2a79 PA |
8821 | |
8822 | return 0; | |
c906108c | 8823 | } |
c906108c | 8824 | \f |
c5aa993b | 8825 | int |
96baa820 | 8826 | signal_stop_state (int signo) |
c906108c | 8827 | { |
d6b48e9c | 8828 | return signal_stop[signo]; |
c906108c SS |
8829 | } |
8830 | ||
c5aa993b | 8831 | int |
96baa820 | 8832 | signal_print_state (int signo) |
c906108c SS |
8833 | { |
8834 | return signal_print[signo]; | |
8835 | } | |
8836 | ||
c5aa993b | 8837 | int |
96baa820 | 8838 | signal_pass_state (int signo) |
c906108c SS |
8839 | { |
8840 | return signal_program[signo]; | |
8841 | } | |
8842 | ||
2455069d UW |
8843 | static void |
8844 | signal_cache_update (int signo) | |
8845 | { | |
8846 | if (signo == -1) | |
8847 | { | |
a493e3e2 | 8848 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8849 | signal_cache_update (signo); |
8850 | ||
8851 | return; | |
8852 | } | |
8853 | ||
8854 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8855 | && signal_print[signo] == 0 | |
ab04a2af TT |
8856 | && signal_program[signo] == 1 |
8857 | && signal_catch[signo] == 0); | |
2455069d UW |
8858 | } |
8859 | ||
488f131b | 8860 | int |
7bda5e4a | 8861 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8862 | { |
8863 | int ret = signal_stop[signo]; | |
abbb1732 | 8864 | |
d4f3574e | 8865 | signal_stop[signo] = state; |
2455069d | 8866 | signal_cache_update (signo); |
d4f3574e SS |
8867 | return ret; |
8868 | } | |
8869 | ||
488f131b | 8870 | int |
7bda5e4a | 8871 | signal_print_update (int signo, int state) |
d4f3574e SS |
8872 | { |
8873 | int ret = signal_print[signo]; | |
abbb1732 | 8874 | |
d4f3574e | 8875 | signal_print[signo] = state; |
2455069d | 8876 | signal_cache_update (signo); |
d4f3574e SS |
8877 | return ret; |
8878 | } | |
8879 | ||
488f131b | 8880 | int |
7bda5e4a | 8881 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8882 | { |
8883 | int ret = signal_program[signo]; | |
abbb1732 | 8884 | |
d4f3574e | 8885 | signal_program[signo] = state; |
2455069d | 8886 | signal_cache_update (signo); |
d4f3574e SS |
8887 | return ret; |
8888 | } | |
8889 | ||
ab04a2af TT |
8890 | /* Update the global 'signal_catch' from INFO and notify the |
8891 | target. */ | |
8892 | ||
8893 | void | |
8894 | signal_catch_update (const unsigned int *info) | |
8895 | { | |
8896 | int i; | |
8897 | ||
8898 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8899 | signal_catch[i] = info[i] > 0; | |
8900 | signal_cache_update (-1); | |
adc6a863 | 8901 | target_pass_signals (signal_pass); |
ab04a2af TT |
8902 | } |
8903 | ||
c906108c | 8904 | static void |
96baa820 | 8905 | sig_print_header (void) |
c906108c | 8906 | { |
3e43a32a MS |
8907 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8908 | "to program\tDescription\n")); | |
c906108c SS |
8909 | } |
8910 | ||
8911 | static void | |
2ea28649 | 8912 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8913 | { |
2ea28649 | 8914 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8915 | int name_padding = 13 - strlen (name); |
96baa820 | 8916 | |
c906108c SS |
8917 | if (name_padding <= 0) |
8918 | name_padding = 0; | |
8919 | ||
8920 | printf_filtered ("%s", name); | |
488f131b | 8921 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8922 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8923 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8924 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8925 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8926 | } |
8927 | ||
8928 | /* Specify how various signals in the inferior should be handled. */ | |
8929 | ||
8930 | static void | |
0b39b52e | 8931 | handle_command (const char *args, int from_tty) |
c906108c | 8932 | { |
c906108c | 8933 | int digits, wordlen; |
b926417a | 8934 | int sigfirst, siglast; |
2ea28649 | 8935 | enum gdb_signal oursig; |
c906108c | 8936 | int allsigs; |
c906108c SS |
8937 | |
8938 | if (args == NULL) | |
8939 | { | |
e2e0b3e5 | 8940 | error_no_arg (_("signal to handle")); |
c906108c SS |
8941 | } |
8942 | ||
1777feb0 | 8943 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8944 | |
adc6a863 PA |
8945 | const size_t nsigs = GDB_SIGNAL_LAST; |
8946 | unsigned char sigs[nsigs] {}; | |
c906108c | 8947 | |
1777feb0 | 8948 | /* Break the command line up into args. */ |
c906108c | 8949 | |
773a1edc | 8950 | gdb_argv built_argv (args); |
c906108c SS |
8951 | |
8952 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8953 | actions. Signal numbers and signal names may be interspersed with | |
8954 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8955 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8956 | |
773a1edc | 8957 | for (char *arg : built_argv) |
c906108c | 8958 | { |
773a1edc TT |
8959 | wordlen = strlen (arg); |
8960 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8961 | {; |
8962 | } | |
8963 | allsigs = 0; | |
8964 | sigfirst = siglast = -1; | |
8965 | ||
773a1edc | 8966 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8967 | { |
8968 | /* Apply action to all signals except those used by the | |
1777feb0 | 8969 | debugger. Silently skip those. */ |
c906108c SS |
8970 | allsigs = 1; |
8971 | sigfirst = 0; | |
8972 | siglast = nsigs - 1; | |
8973 | } | |
773a1edc | 8974 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8975 | { |
8976 | SET_SIGS (nsigs, sigs, signal_stop); | |
8977 | SET_SIGS (nsigs, sigs, signal_print); | |
8978 | } | |
773a1edc | 8979 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8980 | { |
8981 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8982 | } | |
773a1edc | 8983 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8984 | { |
8985 | SET_SIGS (nsigs, sigs, signal_print); | |
8986 | } | |
773a1edc | 8987 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8988 | { |
8989 | SET_SIGS (nsigs, sigs, signal_program); | |
8990 | } | |
773a1edc | 8991 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8992 | { |
8993 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8994 | } | |
773a1edc | 8995 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8996 | { |
8997 | SET_SIGS (nsigs, sigs, signal_program); | |
8998 | } | |
773a1edc | 8999 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
9000 | { |
9001 | UNSET_SIGS (nsigs, sigs, signal_print); | |
9002 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
9003 | } | |
773a1edc | 9004 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
9005 | { |
9006 | UNSET_SIGS (nsigs, sigs, signal_program); | |
9007 | } | |
9008 | else if (digits > 0) | |
9009 | { | |
9010 | /* It is numeric. The numeric signal refers to our own | |
9011 | internal signal numbering from target.h, not to host/target | |
9012 | signal number. This is a feature; users really should be | |
9013 | using symbolic names anyway, and the common ones like | |
9014 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
9015 | ||
9016 | sigfirst = siglast = (int) | |
773a1edc TT |
9017 | gdb_signal_from_command (atoi (arg)); |
9018 | if (arg[digits] == '-') | |
c906108c SS |
9019 | { |
9020 | siglast = (int) | |
773a1edc | 9021 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
9022 | } |
9023 | if (sigfirst > siglast) | |
9024 | { | |
1777feb0 | 9025 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 9026 | std::swap (sigfirst, siglast); |
c906108c SS |
9027 | } |
9028 | } | |
9029 | else | |
9030 | { | |
773a1edc | 9031 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 9032 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
9033 | { |
9034 | sigfirst = siglast = (int) oursig; | |
9035 | } | |
9036 | else | |
9037 | { | |
9038 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 9039 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
9040 | } |
9041 | } | |
9042 | ||
9043 | /* If any signal numbers or symbol names were found, set flags for | |
dda83cd7 | 9044 | which signals to apply actions to. */ |
c906108c | 9045 | |
b926417a | 9046 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 9047 | { |
2ea28649 | 9048 | switch ((enum gdb_signal) signum) |
c906108c | 9049 | { |
a493e3e2 PA |
9050 | case GDB_SIGNAL_TRAP: |
9051 | case GDB_SIGNAL_INT: | |
c906108c SS |
9052 | if (!allsigs && !sigs[signum]) |
9053 | { | |
9e2f0ad4 | 9054 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 9055 | Are you sure you want to change it? "), |
2ea28649 | 9056 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
9057 | { |
9058 | sigs[signum] = 1; | |
9059 | } | |
9060 | else | |
c119e040 | 9061 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
9062 | } |
9063 | break; | |
a493e3e2 PA |
9064 | case GDB_SIGNAL_0: |
9065 | case GDB_SIGNAL_DEFAULT: | |
9066 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
9067 | /* Make sure that "all" doesn't print these. */ |
9068 | break; | |
9069 | default: | |
9070 | sigs[signum] = 1; | |
9071 | break; | |
9072 | } | |
9073 | } | |
c906108c SS |
9074 | } |
9075 | ||
b926417a | 9076 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
9077 | if (sigs[signum]) |
9078 | { | |
2455069d | 9079 | signal_cache_update (-1); |
adc6a863 PA |
9080 | target_pass_signals (signal_pass); |
9081 | target_program_signals (signal_program); | |
c906108c | 9082 | |
3a031f65 PA |
9083 | if (from_tty) |
9084 | { | |
9085 | /* Show the results. */ | |
9086 | sig_print_header (); | |
9087 | for (; signum < nsigs; signum++) | |
9088 | if (sigs[signum]) | |
aead7601 | 9089 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
9090 | } |
9091 | ||
9092 | break; | |
9093 | } | |
c906108c SS |
9094 | } |
9095 | ||
de0bea00 MF |
9096 | /* Complete the "handle" command. */ |
9097 | ||
eb3ff9a5 | 9098 | static void |
de0bea00 | 9099 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 9100 | completion_tracker &tracker, |
6f937416 | 9101 | const char *text, const char *word) |
de0bea00 | 9102 | { |
de0bea00 MF |
9103 | static const char * const keywords[] = |
9104 | { | |
9105 | "all", | |
9106 | "stop", | |
9107 | "ignore", | |
9108 | "print", | |
9109 | "pass", | |
9110 | "nostop", | |
9111 | "noignore", | |
9112 | "noprint", | |
9113 | "nopass", | |
9114 | NULL, | |
9115 | }; | |
9116 | ||
eb3ff9a5 PA |
9117 | signal_completer (ignore, tracker, text, word); |
9118 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
9119 | } |
9120 | ||
2ea28649 PA |
9121 | enum gdb_signal |
9122 | gdb_signal_from_command (int num) | |
ed01b82c PA |
9123 | { |
9124 | if (num >= 1 && num <= 15) | |
2ea28649 | 9125 | return (enum gdb_signal) num; |
ed01b82c PA |
9126 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
9127 | Use \"info signals\" for a list of symbolic signals.")); | |
9128 | } | |
9129 | ||
c906108c SS |
9130 | /* Print current contents of the tables set by the handle command. |
9131 | It is possible we should just be printing signals actually used | |
9132 | by the current target (but for things to work right when switching | |
9133 | targets, all signals should be in the signal tables). */ | |
9134 | ||
9135 | static void | |
1d12d88f | 9136 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 9137 | { |
2ea28649 | 9138 | enum gdb_signal oursig; |
abbb1732 | 9139 | |
c906108c SS |
9140 | sig_print_header (); |
9141 | ||
9142 | if (signum_exp) | |
9143 | { | |
9144 | /* First see if this is a symbol name. */ | |
2ea28649 | 9145 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 9146 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
9147 | { |
9148 | /* No, try numeric. */ | |
9149 | oursig = | |
2ea28649 | 9150 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
9151 | } |
9152 | sig_print_info (oursig); | |
9153 | return; | |
9154 | } | |
9155 | ||
9156 | printf_filtered ("\n"); | |
9157 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
9158 | for (oursig = GDB_SIGNAL_FIRST; |
9159 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 9160 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
9161 | { |
9162 | QUIT; | |
9163 | ||
a493e3e2 PA |
9164 | if (oursig != GDB_SIGNAL_UNKNOWN |
9165 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
9166 | sig_print_info (oursig); |
9167 | } | |
9168 | ||
3e43a32a MS |
9169 | printf_filtered (_("\nUse the \"handle\" command " |
9170 | "to change these tables.\n")); | |
c906108c | 9171 | } |
4aa995e1 PA |
9172 | |
9173 | /* The $_siginfo convenience variable is a bit special. We don't know | |
9174 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 9175 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
9176 | also dependent on which thread you have selected. |
9177 | ||
9178 | 1. making $_siginfo be an internalvar that creates a new value on | |
9179 | access. | |
9180 | ||
9181 | 2. making the value of $_siginfo be an lval_computed value. */ | |
9182 | ||
9183 | /* This function implements the lval_computed support for reading a | |
9184 | $_siginfo value. */ | |
9185 | ||
9186 | static void | |
9187 | siginfo_value_read (struct value *v) | |
9188 | { | |
9189 | LONGEST transferred; | |
9190 | ||
a911d87a PA |
9191 | /* If we can access registers, so can we access $_siginfo. Likewise |
9192 | vice versa. */ | |
9193 | validate_registers_access (); | |
c709acd1 | 9194 | |
4aa995e1 | 9195 | transferred = |
328d42d8 SM |
9196 | target_read (current_inferior ()->top_target (), |
9197 | TARGET_OBJECT_SIGNAL_INFO, | |
4aa995e1 PA |
9198 | NULL, |
9199 | value_contents_all_raw (v), | |
9200 | value_offset (v), | |
9201 | TYPE_LENGTH (value_type (v))); | |
9202 | ||
9203 | if (transferred != TYPE_LENGTH (value_type (v))) | |
9204 | error (_("Unable to read siginfo")); | |
9205 | } | |
9206 | ||
9207 | /* This function implements the lval_computed support for writing a | |
9208 | $_siginfo value. */ | |
9209 | ||
9210 | static void | |
9211 | siginfo_value_write (struct value *v, struct value *fromval) | |
9212 | { | |
9213 | LONGEST transferred; | |
9214 | ||
a911d87a PA |
9215 | /* If we can access registers, so can we access $_siginfo. Likewise |
9216 | vice versa. */ | |
9217 | validate_registers_access (); | |
c709acd1 | 9218 | |
328d42d8 | 9219 | transferred = target_write (current_inferior ()->top_target (), |
4aa995e1 PA |
9220 | TARGET_OBJECT_SIGNAL_INFO, |
9221 | NULL, | |
9222 | value_contents_all_raw (fromval), | |
9223 | value_offset (v), | |
9224 | TYPE_LENGTH (value_type (fromval))); | |
9225 | ||
9226 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
9227 | error (_("Unable to write siginfo")); | |
9228 | } | |
9229 | ||
c8f2448a | 9230 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
9231 | { |
9232 | siginfo_value_read, | |
9233 | siginfo_value_write | |
9234 | }; | |
9235 | ||
9236 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
9237 | the current thread using architecture GDBARCH. Return a void value |
9238 | if there's no object available. */ | |
4aa995e1 | 9239 | |
2c0b251b | 9240 | static struct value * |
22d2b532 SDJ |
9241 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
9242 | void *ignore) | |
4aa995e1 | 9243 | { |
841de120 | 9244 | if (target_has_stack () |
d7e15655 | 9245 | && inferior_ptid != null_ptid |
78267919 | 9246 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 9247 | { |
78267919 | 9248 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 9249 | |
78267919 | 9250 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
9251 | } |
9252 | ||
78267919 | 9253 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
9254 | } |
9255 | ||
c906108c | 9256 | \f |
16c381f0 JK |
9257 | /* infcall_suspend_state contains state about the program itself like its |
9258 | registers and any signal it received when it last stopped. | |
9259 | This state must be restored regardless of how the inferior function call | |
9260 | ends (either successfully, or after it hits a breakpoint or signal) | |
9261 | if the program is to properly continue where it left off. */ | |
9262 | ||
6bf78e29 | 9263 | class infcall_suspend_state |
7a292a7a | 9264 | { |
6bf78e29 AB |
9265 | public: |
9266 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
9267 | once the inferior function call has finished. */ | |
9268 | infcall_suspend_state (struct gdbarch *gdbarch, | |
dda83cd7 SM |
9269 | const struct thread_info *tp, |
9270 | struct regcache *regcache) | |
6bf78e29 AB |
9271 | : m_thread_suspend (tp->suspend), |
9272 | m_registers (new readonly_detached_regcache (*regcache)) | |
9273 | { | |
9274 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
9275 | ||
9276 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
9277 | { | |
dda83cd7 SM |
9278 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
9279 | size_t len = TYPE_LENGTH (type); | |
6bf78e29 | 9280 | |
dda83cd7 | 9281 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); |
6bf78e29 | 9282 | |
328d42d8 SM |
9283 | if (target_read (current_inferior ()->top_target (), |
9284 | TARGET_OBJECT_SIGNAL_INFO, NULL, | |
dda83cd7 SM |
9285 | siginfo_data.get (), 0, len) != len) |
9286 | { | |
9287 | /* Errors ignored. */ | |
9288 | siginfo_data.reset (nullptr); | |
9289 | } | |
6bf78e29 AB |
9290 | } |
9291 | ||
9292 | if (siginfo_data) | |
9293 | { | |
dda83cd7 SM |
9294 | m_siginfo_gdbarch = gdbarch; |
9295 | m_siginfo_data = std::move (siginfo_data); | |
6bf78e29 AB |
9296 | } |
9297 | } | |
9298 | ||
9299 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 9300 | |
6bf78e29 AB |
9301 | readonly_detached_regcache *registers () const |
9302 | { | |
9303 | return m_registers.get (); | |
9304 | } | |
9305 | ||
9306 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
9307 | ||
9308 | void restore (struct gdbarch *gdbarch, | |
dda83cd7 SM |
9309 | struct thread_info *tp, |
9310 | struct regcache *regcache) const | |
6bf78e29 AB |
9311 | { |
9312 | tp->suspend = m_thread_suspend; | |
9313 | ||
9314 | if (m_siginfo_gdbarch == gdbarch) | |
9315 | { | |
dda83cd7 | 9316 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
6bf78e29 | 9317 | |
dda83cd7 | 9318 | /* Errors ignored. */ |
328d42d8 SM |
9319 | target_write (current_inferior ()->top_target (), |
9320 | TARGET_OBJECT_SIGNAL_INFO, NULL, | |
dda83cd7 | 9321 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); |
6bf78e29 AB |
9322 | } |
9323 | ||
9324 | /* The inferior can be gone if the user types "print exit(0)" | |
9325 | (and perhaps other times). */ | |
55f6301a | 9326 | if (target_has_execution ()) |
6bf78e29 AB |
9327 | /* NB: The register write goes through to the target. */ |
9328 | regcache->restore (registers ()); | |
9329 | } | |
9330 | ||
9331 | private: | |
9332 | /* How the current thread stopped before the inferior function call was | |
9333 | executed. */ | |
9334 | struct thread_suspend_state m_thread_suspend; | |
9335 | ||
9336 | /* The registers before the inferior function call was executed. */ | |
9337 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 9338 | |
35515841 | 9339 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 9340 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
9341 | |
9342 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
9343 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
9344 | content would be invalid. */ | |
6bf78e29 | 9345 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
9346 | }; |
9347 | ||
cb524840 TT |
9348 | infcall_suspend_state_up |
9349 | save_infcall_suspend_state () | |
b89667eb | 9350 | { |
b89667eb | 9351 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 9352 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9353 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 9354 | |
6bf78e29 AB |
9355 | infcall_suspend_state_up inf_state |
9356 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 9357 | |
6bf78e29 AB |
9358 | /* Having saved the current state, adjust the thread state, discarding |
9359 | any stop signal information. The stop signal is not useful when | |
9360 | starting an inferior function call, and run_inferior_call will not use | |
9361 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 9362 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 9363 | |
b89667eb DE |
9364 | return inf_state; |
9365 | } | |
9366 | ||
9367 | /* Restore inferior session state to INF_STATE. */ | |
9368 | ||
9369 | void | |
16c381f0 | 9370 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
9371 | { |
9372 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 9373 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9374 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 9375 | |
6bf78e29 | 9376 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 9377 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
9378 | } |
9379 | ||
b89667eb | 9380 | void |
16c381f0 | 9381 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 9382 | { |
dd848631 | 9383 | delete inf_state; |
b89667eb DE |
9384 | } |
9385 | ||
daf6667d | 9386 | readonly_detached_regcache * |
16c381f0 | 9387 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 9388 | { |
6bf78e29 | 9389 | return inf_state->registers (); |
b89667eb DE |
9390 | } |
9391 | ||
16c381f0 JK |
9392 | /* infcall_control_state contains state regarding gdb's control of the |
9393 | inferior itself like stepping control. It also contains session state like | |
9394 | the user's currently selected frame. */ | |
b89667eb | 9395 | |
16c381f0 | 9396 | struct infcall_control_state |
b89667eb | 9397 | { |
16c381f0 JK |
9398 | struct thread_control_state thread_control; |
9399 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
9400 | |
9401 | /* Other fields: */ | |
ee841dd8 TT |
9402 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
9403 | int stopped_by_random_signal = 0; | |
7a292a7a | 9404 | |
79952e69 PA |
9405 | /* ID and level of the selected frame when the inferior function |
9406 | call was made. */ | |
ee841dd8 | 9407 | struct frame_id selected_frame_id {}; |
79952e69 | 9408 | int selected_frame_level = -1; |
7a292a7a SS |
9409 | }; |
9410 | ||
c906108c | 9411 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9412 | connection. */ |
c906108c | 9413 | |
cb524840 TT |
9414 | infcall_control_state_up |
9415 | save_infcall_control_state () | |
c906108c | 9416 | { |
cb524840 | 9417 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9418 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9419 | struct inferior *inf = current_inferior (); |
7a292a7a | 9420 | |
16c381f0 JK |
9421 | inf_status->thread_control = tp->control; |
9422 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9423 | |
8358c15c | 9424 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9425 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9426 | |
16c381f0 JK |
9427 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9428 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9429 | hand them back the original chain when restore_infcall_control_state is | |
9430 | called. */ | |
9431 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9432 | |
9433 | /* Other fields: */ | |
9434 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9435 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9436 | |
79952e69 PA |
9437 | save_selected_frame (&inf_status->selected_frame_id, |
9438 | &inf_status->selected_frame_level); | |
b89667eb | 9439 | |
7a292a7a | 9440 | return inf_status; |
c906108c SS |
9441 | } |
9442 | ||
b89667eb DE |
9443 | /* Restore inferior session state to INF_STATUS. */ |
9444 | ||
c906108c | 9445 | void |
16c381f0 | 9446 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9447 | { |
4e1c45ea | 9448 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9449 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9450 | |
8358c15c JK |
9451 | if (tp->control.step_resume_breakpoint) |
9452 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9453 | ||
5b79abe7 TT |
9454 | if (tp->control.exception_resume_breakpoint) |
9455 | tp->control.exception_resume_breakpoint->disposition | |
9456 | = disp_del_at_next_stop; | |
9457 | ||
d82142e2 | 9458 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9459 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9460 | |
16c381f0 JK |
9461 | tp->control = inf_status->thread_control; |
9462 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9463 | |
9464 | /* Other fields: */ | |
9465 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9466 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9467 | |
841de120 | 9468 | if (target_has_stack ()) |
c906108c | 9469 | { |
79952e69 PA |
9470 | restore_selected_frame (inf_status->selected_frame_id, |
9471 | inf_status->selected_frame_level); | |
c906108c | 9472 | } |
c906108c | 9473 | |
ee841dd8 | 9474 | delete inf_status; |
7a292a7a | 9475 | } |
c906108c SS |
9476 | |
9477 | void | |
16c381f0 | 9478 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9479 | { |
8358c15c JK |
9480 | if (inf_status->thread_control.step_resume_breakpoint) |
9481 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9482 | = disp_del_at_next_stop; | |
9483 | ||
5b79abe7 TT |
9484 | if (inf_status->thread_control.exception_resume_breakpoint) |
9485 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9486 | = disp_del_at_next_stop; | |
9487 | ||
1777feb0 | 9488 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9489 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9490 | |
ee841dd8 | 9491 | delete inf_status; |
7a292a7a | 9492 | } |
b89667eb | 9493 | \f |
7f89fd65 | 9494 | /* See infrun.h. */ |
0c557179 SDJ |
9495 | |
9496 | void | |
9497 | clear_exit_convenience_vars (void) | |
9498 | { | |
9499 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9500 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9501 | } | |
c5aa993b | 9502 | \f |
488f131b | 9503 | |
b2175913 MS |
9504 | /* User interface for reverse debugging: |
9505 | Set exec-direction / show exec-direction commands | |
9506 | (returns error unless target implements to_set_exec_direction method). */ | |
9507 | ||
170742de | 9508 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9509 | static const char exec_forward[] = "forward"; |
9510 | static const char exec_reverse[] = "reverse"; | |
9511 | static const char *exec_direction = exec_forward; | |
40478521 | 9512 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9513 | exec_forward, |
9514 | exec_reverse, | |
9515 | NULL | |
9516 | }; | |
9517 | ||
9518 | static void | |
eb4c3f4a | 9519 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9520 | struct cmd_list_element *cmd) |
9521 | { | |
05374cfd | 9522 | if (target_can_execute_reverse ()) |
b2175913 MS |
9523 | { |
9524 | if (!strcmp (exec_direction, exec_forward)) | |
9525 | execution_direction = EXEC_FORWARD; | |
9526 | else if (!strcmp (exec_direction, exec_reverse)) | |
9527 | execution_direction = EXEC_REVERSE; | |
9528 | } | |
8bbed405 MS |
9529 | else |
9530 | { | |
9531 | exec_direction = exec_forward; | |
9532 | error (_("Target does not support this operation.")); | |
9533 | } | |
b2175913 MS |
9534 | } |
9535 | ||
9536 | static void | |
9537 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9538 | struct cmd_list_element *cmd, const char *value) | |
9539 | { | |
9540 | switch (execution_direction) { | |
9541 | case EXEC_FORWARD: | |
9542 | fprintf_filtered (out, _("Forward.\n")); | |
9543 | break; | |
9544 | case EXEC_REVERSE: | |
9545 | fprintf_filtered (out, _("Reverse.\n")); | |
9546 | break; | |
b2175913 | 9547 | default: |
d8b34453 PA |
9548 | internal_error (__FILE__, __LINE__, |
9549 | _("bogus execution_direction value: %d"), | |
9550 | (int) execution_direction); | |
b2175913 MS |
9551 | } |
9552 | } | |
9553 | ||
d4db2f36 PA |
9554 | static void |
9555 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9556 | struct cmd_list_element *c, const char *value) | |
9557 | { | |
3e43a32a MS |
9558 | fprintf_filtered (file, _("Resuming the execution of threads " |
9559 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9560 | } |
ad52ddc6 | 9561 | |
22d2b532 SDJ |
9562 | /* Implementation of `siginfo' variable. */ |
9563 | ||
9564 | static const struct internalvar_funcs siginfo_funcs = | |
9565 | { | |
9566 | siginfo_make_value, | |
9567 | NULL, | |
9568 | NULL | |
9569 | }; | |
9570 | ||
372316f1 PA |
9571 | /* Callback for infrun's target events source. This is marked when a |
9572 | thread has a pending status to process. */ | |
9573 | ||
9574 | static void | |
9575 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9576 | { | |
6b36ddeb | 9577 | clear_async_event_handler (infrun_async_inferior_event_token); |
b1a35af2 | 9578 | inferior_event_handler (INF_REG_EVENT); |
372316f1 PA |
9579 | } |
9580 | ||
8087c3fa | 9581 | #if GDB_SELF_TEST |
b161a60d SM |
9582 | namespace selftests |
9583 | { | |
9584 | ||
9585 | /* Verify that when two threads with the same ptid exist (from two different | |
9586 | targets) and one of them changes ptid, we only update inferior_ptid if | |
9587 | it is appropriate. */ | |
9588 | ||
9589 | static void | |
9590 | infrun_thread_ptid_changed () | |
9591 | { | |
9592 | gdbarch *arch = current_inferior ()->gdbarch; | |
9593 | ||
9594 | /* The thread which inferior_ptid represents changes ptid. */ | |
9595 | { | |
9596 | scoped_restore_current_pspace_and_thread restore; | |
9597 | ||
9598 | scoped_mock_context<test_target_ops> target1 (arch); | |
9599 | scoped_mock_context<test_target_ops> target2 (arch); | |
9600 | target2.mock_inferior.next = &target1.mock_inferior; | |
9601 | ||
9602 | ptid_t old_ptid (111, 222); | |
9603 | ptid_t new_ptid (111, 333); | |
9604 | ||
9605 | target1.mock_inferior.pid = old_ptid.pid (); | |
9606 | target1.mock_thread.ptid = old_ptid; | |
9607 | target2.mock_inferior.pid = old_ptid.pid (); | |
9608 | target2.mock_thread.ptid = old_ptid; | |
9609 | ||
9610 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
9611 | set_current_inferior (&target1.mock_inferior); | |
9612 | ||
9613 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9614 | ||
9615 | gdb_assert (inferior_ptid == new_ptid); | |
9616 | } | |
9617 | ||
9618 | /* A thread with the same ptid as inferior_ptid, but from another target, | |
9619 | changes ptid. */ | |
9620 | { | |
9621 | scoped_restore_current_pspace_and_thread restore; | |
9622 | ||
9623 | scoped_mock_context<test_target_ops> target1 (arch); | |
9624 | scoped_mock_context<test_target_ops> target2 (arch); | |
9625 | target2.mock_inferior.next = &target1.mock_inferior; | |
9626 | ||
9627 | ptid_t old_ptid (111, 222); | |
9628 | ptid_t new_ptid (111, 333); | |
9629 | ||
9630 | target1.mock_inferior.pid = old_ptid.pid (); | |
9631 | target1.mock_thread.ptid = old_ptid; | |
9632 | target2.mock_inferior.pid = old_ptid.pid (); | |
9633 | target2.mock_thread.ptid = old_ptid; | |
9634 | ||
9635 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
9636 | set_current_inferior (&target2.mock_inferior); | |
9637 | ||
9638 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9639 | ||
9640 | gdb_assert (inferior_ptid == old_ptid); | |
9641 | } | |
9642 | } | |
9643 | ||
9644 | } /* namespace selftests */ | |
9645 | ||
8087c3fa JB |
9646 | #endif /* GDB_SELF_TEST */ |
9647 | ||
6c265988 | 9648 | void _initialize_infrun (); |
c906108c | 9649 | void |
6c265988 | 9650 | _initialize_infrun () |
c906108c | 9651 | { |
de0bea00 | 9652 | struct cmd_list_element *c; |
c906108c | 9653 | |
372316f1 PA |
9654 | /* Register extra event sources in the event loop. */ |
9655 | infrun_async_inferior_event_token | |
db20ebdf SM |
9656 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL, |
9657 | "infrun"); | |
372316f1 | 9658 | |
e0f25bd9 SM |
9659 | cmd_list_element *info_signals_cmd |
9660 | = add_info ("signals", info_signals_command, _("\ | |
1bedd215 AC |
9661 | What debugger does when program gets various signals.\n\ |
9662 | Specify a signal as argument to print info on that signal only.")); | |
e0f25bd9 | 9663 | add_info_alias ("handle", info_signals_cmd, 0); |
c906108c | 9664 | |
de0bea00 | 9665 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9666 | Specify how to handle signals.\n\ |
486c7739 | 9667 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9668 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9669 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9670 | will be displayed instead.\n\ |
9671 | \n\ | |
c906108c SS |
9672 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9673 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9674 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9675 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9676 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9677 | \n\ |
1bedd215 | 9678 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9679 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9680 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9681 | Print means print a message if this signal happens.\n\ | |
9682 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9683 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9684 | Pass and Stop may be combined.\n\ |
9685 | \n\ | |
9686 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9687 | may be interspersed with actions, with the actions being performed for\n\ | |
9688 | all signals cumulatively specified.")); | |
de0bea00 | 9689 | set_cmd_completer (c, handle_completer); |
486c7739 | 9690 | |
c906108c | 9691 | if (!dbx_commands) |
1a966eab AC |
9692 | stop_command = add_cmd ("stop", class_obscure, |
9693 | not_just_help_class_command, _("\ | |
9694 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9695 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9696 | of the program stops."), &cmdlist); |
c906108c | 9697 | |
94ba44a6 SM |
9698 | add_setshow_boolean_cmd |
9699 | ("infrun", class_maintenance, &debug_infrun, | |
9700 | _("Set inferior debugging."), | |
9701 | _("Show inferior debugging."), | |
9702 | _("When non-zero, inferior specific debugging is enabled."), | |
9703 | NULL, show_debug_infrun, &setdebuglist, &showdebuglist); | |
527159b7 | 9704 | |
ad52ddc6 PA |
9705 | add_setshow_boolean_cmd ("non-stop", no_class, |
9706 | &non_stop_1, _("\ | |
9707 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9708 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9709 | When debugging a multi-threaded program and this setting is\n\ | |
9710 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9711 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9712 | all other threads in the program while you interact with the thread of\n\ | |
9713 | interest. When you continue or step a thread, you can allow the other\n\ | |
9714 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9715 | thread's state, all threads stop.\n\ | |
9716 | \n\ | |
9717 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9718 | to run freely. You'll be able to step each thread independently,\n\ | |
9719 | leave it stopped or free to run as needed."), | |
9720 | set_non_stop, | |
9721 | show_non_stop, | |
9722 | &setlist, | |
9723 | &showlist); | |
9724 | ||
adc6a863 | 9725 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9726 | { |
9727 | signal_stop[i] = 1; | |
9728 | signal_print[i] = 1; | |
9729 | signal_program[i] = 1; | |
ab04a2af | 9730 | signal_catch[i] = 0; |
c906108c SS |
9731 | } |
9732 | ||
4d9d9d04 PA |
9733 | /* Signals caused by debugger's own actions should not be given to |
9734 | the program afterwards. | |
9735 | ||
9736 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9737 | explicitly specifies that it should be delivered to the target | |
9738 | program. Typically, that would occur when a user is debugging a | |
9739 | target monitor on a simulator: the target monitor sets a | |
9740 | breakpoint; the simulator encounters this breakpoint and halts | |
9741 | the simulation handing control to GDB; GDB, noting that the stop | |
9742 | address doesn't map to any known breakpoint, returns control back | |
9743 | to the simulator; the simulator then delivers the hardware | |
9744 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9745 | debugged. */ | |
a493e3e2 PA |
9746 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9747 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9748 | |
9749 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9750 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9751 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9752 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9753 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9754 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9755 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9756 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9757 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9758 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9759 | signal_print[GDB_SIGNAL_IO] = 0; | |
9760 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9761 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9762 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9763 | signal_print[GDB_SIGNAL_URG] = 0; | |
9764 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9765 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9766 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9767 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9768 | |
cd0fc7c3 SS |
9769 | /* These signals are used internally by user-level thread |
9770 | implementations. (See signal(5) on Solaris.) Like the above | |
9771 | signals, a healthy program receives and handles them as part of | |
9772 | its normal operation. */ | |
a493e3e2 PA |
9773 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9774 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9775 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9776 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9777 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9778 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9779 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9780 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9781 | |
2455069d UW |
9782 | /* Update cached state. */ |
9783 | signal_cache_update (-1); | |
9784 | ||
85c07804 AC |
9785 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9786 | &stop_on_solib_events, _("\ | |
9787 | Set stopping for shared library events."), _("\ | |
9788 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9789 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9790 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9791 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9792 | set_stop_on_solib_events, |
920d2a44 | 9793 | show_stop_on_solib_events, |
85c07804 | 9794 | &setlist, &showlist); |
c906108c | 9795 | |
7ab04401 AC |
9796 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9797 | follow_fork_mode_kind_names, | |
9798 | &follow_fork_mode_string, _("\ | |
9799 | Set debugger response to a program call of fork or vfork."), _("\ | |
9800 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9801 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9802 | parent - the original process is debugged after a fork\n\ | |
9803 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9804 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9805 | By default, the debugger will follow the parent process."), |
9806 | NULL, | |
920d2a44 | 9807 | show_follow_fork_mode_string, |
7ab04401 AC |
9808 | &setlist, &showlist); |
9809 | ||
6c95b8df PA |
9810 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9811 | follow_exec_mode_names, | |
9812 | &follow_exec_mode_string, _("\ | |
9813 | Set debugger response to a program call of exec."), _("\ | |
9814 | Show debugger response to a program call of exec."), _("\ | |
9815 | An exec call replaces the program image of a process.\n\ | |
9816 | \n\ | |
9817 | follow-exec-mode can be:\n\ | |
9818 | \n\ | |
cce7e648 | 9819 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9820 | to this new inferior. The program the process was running before\n\ |
9821 | the exec call can be restarted afterwards by restarting the original\n\ | |
9822 | inferior.\n\ | |
9823 | \n\ | |
9824 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9825 | The new executable image replaces the previous executable loaded in\n\ | |
9826 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9827 | the executable the process was running after the exec call.\n\ | |
9828 | \n\ | |
9829 | By default, the debugger will use the same inferior."), | |
9830 | NULL, | |
9831 | show_follow_exec_mode_string, | |
9832 | &setlist, &showlist); | |
9833 | ||
7ab04401 AC |
9834 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9835 | scheduler_enums, &scheduler_mode, _("\ | |
9836 | Set mode for locking scheduler during execution."), _("\ | |
9837 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9838 | off == no locking (threads may preempt at any time)\n\ |
9839 | on == full locking (no thread except the current thread may run)\n\ | |
dda83cd7 | 9840 | This applies to both normal execution and replay mode.\n\ |
f2665db5 | 9841 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ |
dda83cd7 SM |
9842 | In this mode, other threads may run during other commands.\n\ |
9843 | This applies to both normal execution and replay mode.\n\ | |
f2665db5 | 9844 | replay == scheduler locked in replay mode and unlocked during normal execution."), |
7ab04401 | 9845 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9846 | show_scheduler_mode, |
7ab04401 | 9847 | &setlist, &showlist); |
5fbbeb29 | 9848 | |
d4db2f36 PA |
9849 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9850 | Set mode for resuming threads of all processes."), _("\ | |
9851 | Show mode for resuming threads of all processes."), _("\ | |
9852 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9853 | threads of all processes. When off (which is the default), execution\n\ | |
9854 | commands only resume the threads of the current process. The set of\n\ | |
9855 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9856 | mode (see help set scheduler-locking)."), | |
9857 | NULL, | |
9858 | show_schedule_multiple, | |
9859 | &setlist, &showlist); | |
9860 | ||
5bf193a2 AC |
9861 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9862 | Set mode of the step operation."), _("\ | |
9863 | Show mode of the step operation."), _("\ | |
9864 | When set, doing a step over a function without debug line information\n\ | |
9865 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9866 | function is skipped and the step command stops at a different source line."), | |
9867 | NULL, | |
920d2a44 | 9868 | show_step_stop_if_no_debug, |
5bf193a2 | 9869 | &setlist, &showlist); |
ca6724c1 | 9870 | |
72d0e2c5 YQ |
9871 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9872 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9873 | Set debugger's willingness to use displaced stepping."), _("\ |
9874 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9875 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9876 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9877 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9878 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9879 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9880 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9881 | NULL, |
9882 | show_can_use_displaced_stepping, | |
9883 | &setlist, &showlist); | |
237fc4c9 | 9884 | |
b2175913 MS |
9885 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9886 | &exec_direction, _("Set direction of execution.\n\ | |
9887 | Options are 'forward' or 'reverse'."), | |
9888 | _("Show direction of execution (forward/reverse)."), | |
9889 | _("Tells gdb whether to execute forward or backward."), | |
9890 | set_exec_direction_func, show_exec_direction_func, | |
9891 | &setlist, &showlist); | |
9892 | ||
6c95b8df PA |
9893 | /* Set/show detach-on-fork: user-settable mode. */ |
9894 | ||
9895 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9896 | Set whether gdb will detach the child of a fork."), _("\ | |
9897 | Show whether gdb will detach the child of a fork."), _("\ | |
9898 | Tells gdb whether to detach the child of a fork."), | |
9899 | NULL, NULL, &setlist, &showlist); | |
9900 | ||
03583c20 UW |
9901 | /* Set/show disable address space randomization mode. */ |
9902 | ||
9903 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9904 | &disable_randomization, _("\ | |
9905 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9906 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9907 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9908 | address space is disabled. Standalone programs run with the randomization\n\ | |
9909 | enabled by default on some platforms."), | |
9910 | &set_disable_randomization, | |
9911 | &show_disable_randomization, | |
9912 | &setlist, &showlist); | |
9913 | ||
ca6724c1 | 9914 | /* ptid initializations */ |
ca6724c1 KB |
9915 | inferior_ptid = null_ptid; |
9916 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9917 | |
c90e7d63 SM |
9918 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed, |
9919 | "infrun"); | |
9920 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested, | |
9921 | "infrun"); | |
9922 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit, "infrun"); | |
9923 | gdb::observers::inferior_exit.attach (infrun_inferior_exit, "infrun"); | |
9924 | gdb::observers::inferior_execd.attach (infrun_inferior_execd, "infrun"); | |
4aa995e1 PA |
9925 | |
9926 | /* Explicitly create without lookup, since that tries to create a | |
9927 | value with a void typed value, and when we get here, gdbarch | |
9928 | isn't initialized yet. At this point, we're quite sure there | |
9929 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9930 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9931 | |
9932 | add_setshow_boolean_cmd ("observer", no_class, | |
9933 | &observer_mode_1, _("\ | |
9934 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9935 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9936 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9937 | affect its execution. Registers and memory may not be changed,\n\ | |
9938 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9939 | or signalled."), | |
9940 | set_observer_mode, | |
9941 | show_observer_mode, | |
9942 | &setlist, | |
9943 | &showlist); | |
b161a60d SM |
9944 | |
9945 | #if GDB_SELF_TEST | |
9946 | selftests::register_test ("infrun_thread_ptid_changed", | |
9947 | selftests::infrun_thread_ptid_changed); | |
9948 | #endif | |
c906108c | 9949 | } |