Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
42a4f53d | 4 | Copyright (C) 1986-2019 Free Software Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 11 | (at your option) any later version. |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | #include "defs.h" | |
45741a9c | 22 | #include "infrun.h" |
c906108c SS |
23 | #include <ctype.h> |
24 | #include "symtab.h" | |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "breakpoint.h" | |
0747795c | 28 | #include "common/gdb_wait.h" |
c906108c SS |
29 | #include "gdbcore.h" |
30 | #include "gdbcmd.h" | |
210661e7 | 31 | #include "cli/cli-script.h" |
c906108c SS |
32 | #include "target.h" |
33 | #include "gdbthread.h" | |
34 | #include "annotate.h" | |
1adeb98a | 35 | #include "symfile.h" |
7a292a7a | 36 | #include "top.h" |
c906108c | 37 | #include <signal.h> |
2acceee2 | 38 | #include "inf-loop.h" |
4e052eda | 39 | #include "regcache.h" |
fd0407d6 | 40 | #include "value.h" |
76727919 | 41 | #include "observable.h" |
f636b87d | 42 | #include "language.h" |
a77053c2 | 43 | #include "solib.h" |
f17517ea | 44 | #include "main.h" |
186c406b TT |
45 | #include "dictionary.h" |
46 | #include "block.h" | |
034dad6f | 47 | #include "mi/mi-common.h" |
4f8d22e3 | 48 | #include "event-top.h" |
96429cc8 | 49 | #include "record.h" |
d02ed0bb | 50 | #include "record-full.h" |
edb3359d | 51 | #include "inline-frame.h" |
4efc6507 | 52 | #include "jit.h" |
06cd862c | 53 | #include "tracepoint.h" |
be34f849 | 54 | #include "continuations.h" |
b4a14fd0 | 55 | #include "interps.h" |
1bfeeb0f | 56 | #include "skip.h" |
28106bc2 SDJ |
57 | #include "probe.h" |
58 | #include "objfiles.h" | |
de0bea00 | 59 | #include "completer.h" |
9107fc8d | 60 | #include "target-descriptions.h" |
f15cb84a | 61 | #include "target-dcache.h" |
d83ad864 | 62 | #include "terminal.h" |
ff862be4 | 63 | #include "solist.h" |
372316f1 | 64 | #include "event-loop.h" |
243a9253 | 65 | #include "thread-fsm.h" |
8d297bbf | 66 | #include "common/enum-flags.h" |
5ed8105e PA |
67 | #include "progspace-and-thread.h" |
68 | #include "common/gdb_optional.h" | |
46a62268 | 69 | #include "arch-utils.h" |
4c41382a | 70 | #include "common/scope-exit.h" |
c906108c SS |
71 | |
72 | /* Prototypes for local functions */ | |
73 | ||
2ea28649 | 74 | static void sig_print_info (enum gdb_signal); |
c906108c | 75 | |
96baa820 | 76 | static void sig_print_header (void); |
c906108c | 77 | |
4ef3f3be | 78 | static int follow_fork (void); |
96baa820 | 79 | |
d83ad864 DB |
80 | static int follow_fork_inferior (int follow_child, int detach_fork); |
81 | ||
82 | static void follow_inferior_reset_breakpoints (void); | |
83 | ||
a289b8f6 JK |
84 | static int currently_stepping (struct thread_info *tp); |
85 | ||
e58b0e63 PA |
86 | void nullify_last_target_wait_ptid (void); |
87 | ||
2c03e5be | 88 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
89 | |
90 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
91 | ||
2484c66b UW |
92 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
93 | ||
8550d3b3 YQ |
94 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
95 | ||
aff4e175 AB |
96 | static void resume (gdb_signal sig); |
97 | ||
372316f1 PA |
98 | /* Asynchronous signal handler registered as event loop source for |
99 | when we have pending events ready to be passed to the core. */ | |
100 | static struct async_event_handler *infrun_async_inferior_event_token; | |
101 | ||
102 | /* Stores whether infrun_async was previously enabled or disabled. | |
103 | Starts off as -1, indicating "never enabled/disabled". */ | |
104 | static int infrun_is_async = -1; | |
105 | ||
106 | /* See infrun.h. */ | |
107 | ||
108 | void | |
109 | infrun_async (int enable) | |
110 | { | |
111 | if (infrun_is_async != enable) | |
112 | { | |
113 | infrun_is_async = enable; | |
114 | ||
115 | if (debug_infrun) | |
116 | fprintf_unfiltered (gdb_stdlog, | |
117 | "infrun: infrun_async(%d)\n", | |
118 | enable); | |
119 | ||
120 | if (enable) | |
121 | mark_async_event_handler (infrun_async_inferior_event_token); | |
122 | else | |
123 | clear_async_event_handler (infrun_async_inferior_event_token); | |
124 | } | |
125 | } | |
126 | ||
0b333c5e PA |
127 | /* See infrun.h. */ |
128 | ||
129 | void | |
130 | mark_infrun_async_event_handler (void) | |
131 | { | |
132 | mark_async_event_handler (infrun_async_inferior_event_token); | |
133 | } | |
134 | ||
5fbbeb29 CF |
135 | /* When set, stop the 'step' command if we enter a function which has |
136 | no line number information. The normal behavior is that we step | |
137 | over such function. */ | |
138 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
139 | static void |
140 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
141 | struct cmd_list_element *c, const char *value) | |
142 | { | |
143 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
144 | } | |
5fbbeb29 | 145 | |
b9f437de PA |
146 | /* proceed and normal_stop use this to notify the user when the |
147 | inferior stopped in a different thread than it had been running | |
148 | in. */ | |
96baa820 | 149 | |
39f77062 | 150 | static ptid_t previous_inferior_ptid; |
7a292a7a | 151 | |
07107ca6 LM |
152 | /* If set (default for legacy reasons), when following a fork, GDB |
153 | will detach from one of the fork branches, child or parent. | |
154 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
155 | setting. */ | |
156 | ||
157 | static int detach_fork = 1; | |
6c95b8df | 158 | |
237fc4c9 PA |
159 | int debug_displaced = 0; |
160 | static void | |
161 | show_debug_displaced (struct ui_file *file, int from_tty, | |
162 | struct cmd_list_element *c, const char *value) | |
163 | { | |
164 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
165 | } | |
166 | ||
ccce17b0 | 167 | unsigned int debug_infrun = 0; |
920d2a44 AC |
168 | static void |
169 | show_debug_infrun (struct ui_file *file, int from_tty, | |
170 | struct cmd_list_element *c, const char *value) | |
171 | { | |
172 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
173 | } | |
527159b7 | 174 | |
03583c20 UW |
175 | |
176 | /* Support for disabling address space randomization. */ | |
177 | ||
178 | int disable_randomization = 1; | |
179 | ||
180 | static void | |
181 | show_disable_randomization (struct ui_file *file, int from_tty, | |
182 | struct cmd_list_element *c, const char *value) | |
183 | { | |
184 | if (target_supports_disable_randomization ()) | |
185 | fprintf_filtered (file, | |
186 | _("Disabling randomization of debuggee's " | |
187 | "virtual address space is %s.\n"), | |
188 | value); | |
189 | else | |
190 | fputs_filtered (_("Disabling randomization of debuggee's " | |
191 | "virtual address space is unsupported on\n" | |
192 | "this platform.\n"), file); | |
193 | } | |
194 | ||
195 | static void | |
eb4c3f4a | 196 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
197 | struct cmd_list_element *c) |
198 | { | |
199 | if (!target_supports_disable_randomization ()) | |
200 | error (_("Disabling randomization of debuggee's " | |
201 | "virtual address space is unsupported on\n" | |
202 | "this platform.")); | |
203 | } | |
204 | ||
d32dc48e PA |
205 | /* User interface for non-stop mode. */ |
206 | ||
207 | int non_stop = 0; | |
208 | static int non_stop_1 = 0; | |
209 | ||
210 | static void | |
eb4c3f4a | 211 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
212 | struct cmd_list_element *c) |
213 | { | |
214 | if (target_has_execution) | |
215 | { | |
216 | non_stop_1 = non_stop; | |
217 | error (_("Cannot change this setting while the inferior is running.")); | |
218 | } | |
219 | ||
220 | non_stop = non_stop_1; | |
221 | } | |
222 | ||
223 | static void | |
224 | show_non_stop (struct ui_file *file, int from_tty, | |
225 | struct cmd_list_element *c, const char *value) | |
226 | { | |
227 | fprintf_filtered (file, | |
228 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
229 | value); | |
230 | } | |
231 | ||
d914c394 SS |
232 | /* "Observer mode" is somewhat like a more extreme version of |
233 | non-stop, in which all GDB operations that might affect the | |
234 | target's execution have been disabled. */ | |
235 | ||
d914c394 SS |
236 | int observer_mode = 0; |
237 | static int observer_mode_1 = 0; | |
238 | ||
239 | static void | |
eb4c3f4a | 240 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
241 | struct cmd_list_element *c) |
242 | { | |
d914c394 SS |
243 | if (target_has_execution) |
244 | { | |
245 | observer_mode_1 = observer_mode; | |
246 | error (_("Cannot change this setting while the inferior is running.")); | |
247 | } | |
248 | ||
249 | observer_mode = observer_mode_1; | |
250 | ||
251 | may_write_registers = !observer_mode; | |
252 | may_write_memory = !observer_mode; | |
253 | may_insert_breakpoints = !observer_mode; | |
254 | may_insert_tracepoints = !observer_mode; | |
255 | /* We can insert fast tracepoints in or out of observer mode, | |
256 | but enable them if we're going into this mode. */ | |
257 | if (observer_mode) | |
258 | may_insert_fast_tracepoints = 1; | |
259 | may_stop = !observer_mode; | |
260 | update_target_permissions (); | |
261 | ||
262 | /* Going *into* observer mode we must force non-stop, then | |
263 | going out we leave it that way. */ | |
264 | if (observer_mode) | |
265 | { | |
d914c394 SS |
266 | pagination_enabled = 0; |
267 | non_stop = non_stop_1 = 1; | |
268 | } | |
269 | ||
270 | if (from_tty) | |
271 | printf_filtered (_("Observer mode is now %s.\n"), | |
272 | (observer_mode ? "on" : "off")); | |
273 | } | |
274 | ||
275 | static void | |
276 | show_observer_mode (struct ui_file *file, int from_tty, | |
277 | struct cmd_list_element *c, const char *value) | |
278 | { | |
279 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
280 | } | |
281 | ||
282 | /* This updates the value of observer mode based on changes in | |
283 | permissions. Note that we are deliberately ignoring the values of | |
284 | may-write-registers and may-write-memory, since the user may have | |
285 | reason to enable these during a session, for instance to turn on a | |
286 | debugging-related global. */ | |
287 | ||
288 | void | |
289 | update_observer_mode (void) | |
290 | { | |
291 | int newval; | |
292 | ||
293 | newval = (!may_insert_breakpoints | |
294 | && !may_insert_tracepoints | |
295 | && may_insert_fast_tracepoints | |
296 | && !may_stop | |
297 | && non_stop); | |
298 | ||
299 | /* Let the user know if things change. */ | |
300 | if (newval != observer_mode) | |
301 | printf_filtered (_("Observer mode is now %s.\n"), | |
302 | (newval ? "on" : "off")); | |
303 | ||
304 | observer_mode = observer_mode_1 = newval; | |
305 | } | |
c2c6d25f | 306 | |
c906108c SS |
307 | /* Tables of how to react to signals; the user sets them. */ |
308 | ||
adc6a863 PA |
309 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
310 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
311 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 312 | |
ab04a2af TT |
313 | /* Table of signals that are registered with "catch signal". A |
314 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
315 | signal" command. */ |
316 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 317 | |
2455069d UW |
318 | /* Table of signals that the target may silently handle. |
319 | This is automatically determined from the flags above, | |
320 | and simply cached here. */ | |
adc6a863 | 321 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 322 | |
c906108c SS |
323 | #define SET_SIGS(nsigs,sigs,flags) \ |
324 | do { \ | |
325 | int signum = (nsigs); \ | |
326 | while (signum-- > 0) \ | |
327 | if ((sigs)[signum]) \ | |
328 | (flags)[signum] = 1; \ | |
329 | } while (0) | |
330 | ||
331 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
332 | do { \ | |
333 | int signum = (nsigs); \ | |
334 | while (signum-- > 0) \ | |
335 | if ((sigs)[signum]) \ | |
336 | (flags)[signum] = 0; \ | |
337 | } while (0) | |
338 | ||
9b224c5e PA |
339 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
340 | this function is to avoid exporting `signal_program'. */ | |
341 | ||
342 | void | |
343 | update_signals_program_target (void) | |
344 | { | |
adc6a863 | 345 | target_program_signals (signal_program); |
9b224c5e PA |
346 | } |
347 | ||
1777feb0 | 348 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 349 | |
edb3359d | 350 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
351 | |
352 | /* Command list pointer for the "stop" placeholder. */ | |
353 | ||
354 | static struct cmd_list_element *stop_command; | |
355 | ||
c906108c SS |
356 | /* Nonzero if we want to give control to the user when we're notified |
357 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 358 | int stop_on_solib_events; |
f9e14852 GB |
359 | |
360 | /* Enable or disable optional shared library event breakpoints | |
361 | as appropriate when the above flag is changed. */ | |
362 | ||
363 | static void | |
eb4c3f4a TT |
364 | set_stop_on_solib_events (const char *args, |
365 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
366 | { |
367 | update_solib_breakpoints (); | |
368 | } | |
369 | ||
920d2a44 AC |
370 | static void |
371 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
372 | struct cmd_list_element *c, const char *value) | |
373 | { | |
374 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
375 | value); | |
376 | } | |
c906108c | 377 | |
c906108c SS |
378 | /* Nonzero after stop if current stack frame should be printed. */ |
379 | ||
380 | static int stop_print_frame; | |
381 | ||
e02bc4cc | 382 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
383 | returned by target_wait()/deprecated_target_wait_hook(). This |
384 | information is returned by get_last_target_status(). */ | |
39f77062 | 385 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
386 | static struct target_waitstatus target_last_waitstatus; |
387 | ||
4e1c45ea | 388 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 389 | |
53904c9e AC |
390 | static const char follow_fork_mode_child[] = "child"; |
391 | static const char follow_fork_mode_parent[] = "parent"; | |
392 | ||
40478521 | 393 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
394 | follow_fork_mode_child, |
395 | follow_fork_mode_parent, | |
396 | NULL | |
ef346e04 | 397 | }; |
c906108c | 398 | |
53904c9e | 399 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
400 | static void |
401 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
402 | struct cmd_list_element *c, const char *value) | |
403 | { | |
3e43a32a MS |
404 | fprintf_filtered (file, |
405 | _("Debugger response to a program " | |
406 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
407 | value); |
408 | } | |
c906108c SS |
409 | \f |
410 | ||
d83ad864 DB |
411 | /* Handle changes to the inferior list based on the type of fork, |
412 | which process is being followed, and whether the other process | |
413 | should be detached. On entry inferior_ptid must be the ptid of | |
414 | the fork parent. At return inferior_ptid is the ptid of the | |
415 | followed inferior. */ | |
416 | ||
417 | static int | |
418 | follow_fork_inferior (int follow_child, int detach_fork) | |
419 | { | |
420 | int has_vforked; | |
79639e11 | 421 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
422 | |
423 | has_vforked = (inferior_thread ()->pending_follow.kind | |
424 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
425 | parent_ptid = inferior_ptid; |
426 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
427 | |
428 | if (has_vforked | |
429 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 430 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
431 | && !(follow_child || detach_fork || sched_multi)) |
432 | { | |
433 | /* The parent stays blocked inside the vfork syscall until the | |
434 | child execs or exits. If we don't let the child run, then | |
435 | the parent stays blocked. If we're telling the parent to run | |
436 | in the foreground, the user will not be able to ctrl-c to get | |
437 | back the terminal, effectively hanging the debug session. */ | |
438 | fprintf_filtered (gdb_stderr, _("\ | |
439 | Can not resume the parent process over vfork in the foreground while\n\ | |
440 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
441 | \"set schedule-multiple\".\n")); | |
442 | /* FIXME output string > 80 columns. */ | |
443 | return 1; | |
444 | } | |
445 | ||
446 | if (!follow_child) | |
447 | { | |
448 | /* Detach new forked process? */ | |
449 | if (detach_fork) | |
450 | { | |
d83ad864 DB |
451 | /* Before detaching from the child, remove all breakpoints |
452 | from it. If we forked, then this has already been taken | |
453 | care of by infrun.c. If we vforked however, any | |
454 | breakpoint inserted in the parent is visible in the | |
455 | child, even those added while stopped in a vfork | |
456 | catchpoint. This will remove the breakpoints from the | |
457 | parent also, but they'll be reinserted below. */ | |
458 | if (has_vforked) | |
459 | { | |
460 | /* Keep breakpoints list in sync. */ | |
00431a78 | 461 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
462 | } |
463 | ||
f67c0c91 | 464 | if (print_inferior_events) |
d83ad864 | 465 | { |
8dd06f7a | 466 | /* Ensure that we have a process ptid. */ |
e99b03dc | 467 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 468 | |
223ffa71 | 469 | target_terminal::ours_for_output (); |
d83ad864 | 470 | fprintf_filtered (gdb_stdlog, |
f67c0c91 | 471 | _("[Detaching after %s from child %s]\n"), |
6f259a23 | 472 | has_vforked ? "vfork" : "fork", |
8dd06f7a | 473 | target_pid_to_str (process_ptid)); |
d83ad864 DB |
474 | } |
475 | } | |
476 | else | |
477 | { | |
478 | struct inferior *parent_inf, *child_inf; | |
d83ad864 DB |
479 | |
480 | /* Add process to GDB's tables. */ | |
e99b03dc | 481 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
482 | |
483 | parent_inf = current_inferior (); | |
484 | child_inf->attach_flag = parent_inf->attach_flag; | |
485 | copy_terminal_info (child_inf, parent_inf); | |
486 | child_inf->gdbarch = parent_inf->gdbarch; | |
487 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
488 | ||
5ed8105e | 489 | scoped_restore_current_pspace_and_thread restore_pspace_thread; |
d83ad864 | 490 | |
79639e11 | 491 | inferior_ptid = child_ptid; |
f67c0c91 | 492 | add_thread_silent (inferior_ptid); |
2a00d7ce | 493 | set_current_inferior (child_inf); |
d83ad864 DB |
494 | child_inf->symfile_flags = SYMFILE_NO_READ; |
495 | ||
496 | /* If this is a vfork child, then the address-space is | |
497 | shared with the parent. */ | |
498 | if (has_vforked) | |
499 | { | |
500 | child_inf->pspace = parent_inf->pspace; | |
501 | child_inf->aspace = parent_inf->aspace; | |
502 | ||
503 | /* The parent will be frozen until the child is done | |
504 | with the shared region. Keep track of the | |
505 | parent. */ | |
506 | child_inf->vfork_parent = parent_inf; | |
507 | child_inf->pending_detach = 0; | |
508 | parent_inf->vfork_child = child_inf; | |
509 | parent_inf->pending_detach = 0; | |
510 | } | |
511 | else | |
512 | { | |
513 | child_inf->aspace = new_address_space (); | |
564b1e3f | 514 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
515 | child_inf->removable = 1; |
516 | set_current_program_space (child_inf->pspace); | |
517 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
518 | ||
519 | /* Let the shared library layer (e.g., solib-svr4) learn | |
520 | about this new process, relocate the cloned exec, pull | |
521 | in shared libraries, and install the solib event | |
522 | breakpoint. If a "cloned-VM" event was propagated | |
523 | better throughout the core, this wouldn't be | |
524 | required. */ | |
525 | solib_create_inferior_hook (0); | |
526 | } | |
d83ad864 DB |
527 | } |
528 | ||
529 | if (has_vforked) | |
530 | { | |
531 | struct inferior *parent_inf; | |
532 | ||
533 | parent_inf = current_inferior (); | |
534 | ||
535 | /* If we detached from the child, then we have to be careful | |
536 | to not insert breakpoints in the parent until the child | |
537 | is done with the shared memory region. However, if we're | |
538 | staying attached to the child, then we can and should | |
539 | insert breakpoints, so that we can debug it. A | |
540 | subsequent child exec or exit is enough to know when does | |
541 | the child stops using the parent's address space. */ | |
542 | parent_inf->waiting_for_vfork_done = detach_fork; | |
543 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
544 | } | |
545 | } | |
546 | else | |
547 | { | |
548 | /* Follow the child. */ | |
549 | struct inferior *parent_inf, *child_inf; | |
550 | struct program_space *parent_pspace; | |
551 | ||
f67c0c91 | 552 | if (print_inferior_events) |
d83ad864 | 553 | { |
f67c0c91 SDJ |
554 | std::string parent_pid = target_pid_to_str (parent_ptid); |
555 | std::string child_pid = target_pid_to_str (child_ptid); | |
556 | ||
223ffa71 | 557 | target_terminal::ours_for_output (); |
6f259a23 | 558 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
559 | _("[Attaching after %s %s to child %s]\n"), |
560 | parent_pid.c_str (), | |
6f259a23 | 561 | has_vforked ? "vfork" : "fork", |
f67c0c91 | 562 | child_pid.c_str ()); |
d83ad864 DB |
563 | } |
564 | ||
565 | /* Add the new inferior first, so that the target_detach below | |
566 | doesn't unpush the target. */ | |
567 | ||
e99b03dc | 568 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
569 | |
570 | parent_inf = current_inferior (); | |
571 | child_inf->attach_flag = parent_inf->attach_flag; | |
572 | copy_terminal_info (child_inf, parent_inf); | |
573 | child_inf->gdbarch = parent_inf->gdbarch; | |
574 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
575 | ||
576 | parent_pspace = parent_inf->pspace; | |
577 | ||
578 | /* If we're vforking, we want to hold on to the parent until the | |
579 | child exits or execs. At child exec or exit time we can | |
580 | remove the old breakpoints from the parent and detach or | |
581 | resume debugging it. Otherwise, detach the parent now; we'll | |
582 | want to reuse it's program/address spaces, but we can't set | |
583 | them to the child before removing breakpoints from the | |
584 | parent, otherwise, the breakpoints module could decide to | |
585 | remove breakpoints from the wrong process (since they'd be | |
586 | assigned to the same address space). */ | |
587 | ||
588 | if (has_vforked) | |
589 | { | |
590 | gdb_assert (child_inf->vfork_parent == NULL); | |
591 | gdb_assert (parent_inf->vfork_child == NULL); | |
592 | child_inf->vfork_parent = parent_inf; | |
593 | child_inf->pending_detach = 0; | |
594 | parent_inf->vfork_child = child_inf; | |
595 | parent_inf->pending_detach = detach_fork; | |
596 | parent_inf->waiting_for_vfork_done = 0; | |
597 | } | |
598 | else if (detach_fork) | |
6f259a23 | 599 | { |
f67c0c91 | 600 | if (print_inferior_events) |
6f259a23 | 601 | { |
8dd06f7a | 602 | /* Ensure that we have a process ptid. */ |
e99b03dc | 603 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); |
8dd06f7a | 604 | |
223ffa71 | 605 | target_terminal::ours_for_output (); |
6f259a23 | 606 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
607 | _("[Detaching after fork from " |
608 | "parent %s]\n"), | |
8dd06f7a | 609 | target_pid_to_str (process_ptid)); |
6f259a23 DB |
610 | } |
611 | ||
6e1e1966 | 612 | target_detach (parent_inf, 0); |
6f259a23 | 613 | } |
d83ad864 DB |
614 | |
615 | /* Note that the detach above makes PARENT_INF dangling. */ | |
616 | ||
617 | /* Add the child thread to the appropriate lists, and switch to | |
618 | this new thread, before cloning the program space, and | |
619 | informing the solib layer about this new process. */ | |
620 | ||
79639e11 | 621 | inferior_ptid = child_ptid; |
f67c0c91 | 622 | add_thread_silent (inferior_ptid); |
2a00d7ce | 623 | set_current_inferior (child_inf); |
d83ad864 DB |
624 | |
625 | /* If this is a vfork child, then the address-space is shared | |
626 | with the parent. If we detached from the parent, then we can | |
627 | reuse the parent's program/address spaces. */ | |
628 | if (has_vforked || detach_fork) | |
629 | { | |
630 | child_inf->pspace = parent_pspace; | |
631 | child_inf->aspace = child_inf->pspace->aspace; | |
632 | } | |
633 | else | |
634 | { | |
635 | child_inf->aspace = new_address_space (); | |
564b1e3f | 636 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
637 | child_inf->removable = 1; |
638 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
639 | set_current_program_space (child_inf->pspace); | |
640 | clone_program_space (child_inf->pspace, parent_pspace); | |
641 | ||
642 | /* Let the shared library layer (e.g., solib-svr4) learn | |
643 | about this new process, relocate the cloned exec, pull in | |
644 | shared libraries, and install the solib event breakpoint. | |
645 | If a "cloned-VM" event was propagated better throughout | |
646 | the core, this wouldn't be required. */ | |
647 | solib_create_inferior_hook (0); | |
648 | } | |
649 | } | |
650 | ||
651 | return target_follow_fork (follow_child, detach_fork); | |
652 | } | |
653 | ||
e58b0e63 PA |
654 | /* Tell the target to follow the fork we're stopped at. Returns true |
655 | if the inferior should be resumed; false, if the target for some | |
656 | reason decided it's best not to resume. */ | |
657 | ||
6604731b | 658 | static int |
4ef3f3be | 659 | follow_fork (void) |
c906108c | 660 | { |
ea1dd7bc | 661 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
662 | int should_resume = 1; |
663 | struct thread_info *tp; | |
664 | ||
665 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
666 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
667 | parent thread structure's run control related fields, not just these. |
668 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
669 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 670 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
671 | CORE_ADDR step_range_start = 0; |
672 | CORE_ADDR step_range_end = 0; | |
673 | struct frame_id step_frame_id = { 0 }; | |
8980e177 | 674 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
675 | |
676 | if (!non_stop) | |
677 | { | |
678 | ptid_t wait_ptid; | |
679 | struct target_waitstatus wait_status; | |
680 | ||
681 | /* Get the last target status returned by target_wait(). */ | |
682 | get_last_target_status (&wait_ptid, &wait_status); | |
683 | ||
684 | /* If not stopped at a fork event, then there's nothing else to | |
685 | do. */ | |
686 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
687 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
688 | return 1; | |
689 | ||
690 | /* Check if we switched over from WAIT_PTID, since the event was | |
691 | reported. */ | |
00431a78 PA |
692 | if (wait_ptid != minus_one_ptid |
693 | && inferior_ptid != wait_ptid) | |
e58b0e63 PA |
694 | { |
695 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
696 | target to follow it (in either direction). We'll | |
697 | afterwards refuse to resume, and inform the user what | |
698 | happened. */ | |
00431a78 PA |
699 | thread_info *wait_thread |
700 | = find_thread_ptid (wait_ptid); | |
701 | switch_to_thread (wait_thread); | |
e58b0e63 PA |
702 | should_resume = 0; |
703 | } | |
704 | } | |
705 | ||
706 | tp = inferior_thread (); | |
707 | ||
708 | /* If there were any forks/vforks that were caught and are now to be | |
709 | followed, then do so now. */ | |
710 | switch (tp->pending_follow.kind) | |
711 | { | |
712 | case TARGET_WAITKIND_FORKED: | |
713 | case TARGET_WAITKIND_VFORKED: | |
714 | { | |
715 | ptid_t parent, child; | |
716 | ||
717 | /* If the user did a next/step, etc, over a fork call, | |
718 | preserve the stepping state in the fork child. */ | |
719 | if (follow_child && should_resume) | |
720 | { | |
8358c15c JK |
721 | step_resume_breakpoint = clone_momentary_breakpoint |
722 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
723 | step_range_start = tp->control.step_range_start; |
724 | step_range_end = tp->control.step_range_end; | |
725 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
726 | exception_resume_breakpoint |
727 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 728 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
729 | |
730 | /* For now, delete the parent's sr breakpoint, otherwise, | |
731 | parent/child sr breakpoints are considered duplicates, | |
732 | and the child version will not be installed. Remove | |
733 | this when the breakpoints module becomes aware of | |
734 | inferiors and address spaces. */ | |
735 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
736 | tp->control.step_range_start = 0; |
737 | tp->control.step_range_end = 0; | |
738 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 739 | delete_exception_resume_breakpoint (tp); |
8980e177 | 740 | tp->thread_fsm = NULL; |
e58b0e63 PA |
741 | } |
742 | ||
743 | parent = inferior_ptid; | |
744 | child = tp->pending_follow.value.related_pid; | |
745 | ||
d83ad864 DB |
746 | /* Set up inferior(s) as specified by the caller, and tell the |
747 | target to do whatever is necessary to follow either parent | |
748 | or child. */ | |
749 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
750 | { |
751 | /* Target refused to follow, or there's some other reason | |
752 | we shouldn't resume. */ | |
753 | should_resume = 0; | |
754 | } | |
755 | else | |
756 | { | |
757 | /* This pending follow fork event is now handled, one way | |
758 | or another. The previous selected thread may be gone | |
759 | from the lists by now, but if it is still around, need | |
760 | to clear the pending follow request. */ | |
e09875d4 | 761 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
762 | if (tp) |
763 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
764 | ||
765 | /* This makes sure we don't try to apply the "Switched | |
766 | over from WAIT_PID" logic above. */ | |
767 | nullify_last_target_wait_ptid (); | |
768 | ||
1777feb0 | 769 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
770 | if (follow_child) |
771 | { | |
00431a78 PA |
772 | thread_info *child_thr = find_thread_ptid (child); |
773 | switch_to_thread (child_thr); | |
e58b0e63 PA |
774 | |
775 | /* ... and preserve the stepping state, in case the | |
776 | user was stepping over the fork call. */ | |
777 | if (should_resume) | |
778 | { | |
779 | tp = inferior_thread (); | |
8358c15c JK |
780 | tp->control.step_resume_breakpoint |
781 | = step_resume_breakpoint; | |
16c381f0 JK |
782 | tp->control.step_range_start = step_range_start; |
783 | tp->control.step_range_end = step_range_end; | |
784 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
785 | tp->control.exception_resume_breakpoint |
786 | = exception_resume_breakpoint; | |
8980e177 | 787 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
788 | } |
789 | else | |
790 | { | |
791 | /* If we get here, it was because we're trying to | |
792 | resume from a fork catchpoint, but, the user | |
793 | has switched threads away from the thread that | |
794 | forked. In that case, the resume command | |
795 | issued is most likely not applicable to the | |
796 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 797 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 798 | "before following fork child.")); |
e58b0e63 PA |
799 | } |
800 | ||
801 | /* Reset breakpoints in the child as appropriate. */ | |
802 | follow_inferior_reset_breakpoints (); | |
803 | } | |
e58b0e63 PA |
804 | } |
805 | } | |
806 | break; | |
807 | case TARGET_WAITKIND_SPURIOUS: | |
808 | /* Nothing to follow. */ | |
809 | break; | |
810 | default: | |
811 | internal_error (__FILE__, __LINE__, | |
812 | "Unexpected pending_follow.kind %d\n", | |
813 | tp->pending_follow.kind); | |
814 | break; | |
815 | } | |
c906108c | 816 | |
e58b0e63 | 817 | return should_resume; |
c906108c SS |
818 | } |
819 | ||
d83ad864 | 820 | static void |
6604731b | 821 | follow_inferior_reset_breakpoints (void) |
c906108c | 822 | { |
4e1c45ea PA |
823 | struct thread_info *tp = inferior_thread (); |
824 | ||
6604731b DJ |
825 | /* Was there a step_resume breakpoint? (There was if the user |
826 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
827 | thread number. Cloned step_resume breakpoints are disabled on |
828 | creation, so enable it here now that it is associated with the | |
829 | correct thread. | |
6604731b DJ |
830 | |
831 | step_resumes are a form of bp that are made to be per-thread. | |
832 | Since we created the step_resume bp when the parent process | |
833 | was being debugged, and now are switching to the child process, | |
834 | from the breakpoint package's viewpoint, that's a switch of | |
835 | "threads". We must update the bp's notion of which thread | |
836 | it is for, or it'll be ignored when it triggers. */ | |
837 | ||
8358c15c | 838 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
839 | { |
840 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
841 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
842 | } | |
6604731b | 843 | |
a1aa2221 | 844 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 845 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
846 | { |
847 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
848 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
849 | } | |
186c406b | 850 | |
6604731b DJ |
851 | /* Reinsert all breakpoints in the child. The user may have set |
852 | breakpoints after catching the fork, in which case those | |
853 | were never set in the child, but only in the parent. This makes | |
854 | sure the inserted breakpoints match the breakpoint list. */ | |
855 | ||
856 | breakpoint_re_set (); | |
857 | insert_breakpoints (); | |
c906108c | 858 | } |
c906108c | 859 | |
6c95b8df PA |
860 | /* The child has exited or execed: resume threads of the parent the |
861 | user wanted to be executing. */ | |
862 | ||
863 | static int | |
864 | proceed_after_vfork_done (struct thread_info *thread, | |
865 | void *arg) | |
866 | { | |
867 | int pid = * (int *) arg; | |
868 | ||
00431a78 PA |
869 | if (thread->ptid.pid () == pid |
870 | && thread->state == THREAD_RUNNING | |
871 | && !thread->executing | |
6c95b8df | 872 | && !thread->stop_requested |
a493e3e2 | 873 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df PA |
874 | { |
875 | if (debug_infrun) | |
876 | fprintf_unfiltered (gdb_stdlog, | |
877 | "infrun: resuming vfork parent thread %s\n", | |
878 | target_pid_to_str (thread->ptid)); | |
879 | ||
00431a78 | 880 | switch_to_thread (thread); |
70509625 | 881 | clear_proceed_status (0); |
64ce06e4 | 882 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
883 | } |
884 | ||
885 | return 0; | |
886 | } | |
887 | ||
5ed8105e PA |
888 | /* Save/restore inferior_ptid, current program space and current |
889 | inferior. Only use this if the current context points at an exited | |
890 | inferior (and therefore there's no current thread to save). */ | |
891 | class scoped_restore_exited_inferior | |
892 | { | |
893 | public: | |
894 | scoped_restore_exited_inferior () | |
895 | : m_saved_ptid (&inferior_ptid) | |
896 | {} | |
897 | ||
898 | private: | |
899 | scoped_restore_tmpl<ptid_t> m_saved_ptid; | |
900 | scoped_restore_current_program_space m_pspace; | |
901 | scoped_restore_current_inferior m_inferior; | |
902 | }; | |
903 | ||
6c95b8df PA |
904 | /* Called whenever we notice an exec or exit event, to handle |
905 | detaching or resuming a vfork parent. */ | |
906 | ||
907 | static void | |
908 | handle_vfork_child_exec_or_exit (int exec) | |
909 | { | |
910 | struct inferior *inf = current_inferior (); | |
911 | ||
912 | if (inf->vfork_parent) | |
913 | { | |
914 | int resume_parent = -1; | |
915 | ||
916 | /* This exec or exit marks the end of the shared memory region | |
917 | between the parent and the child. If the user wanted to | |
918 | detach from the parent, now is the time. */ | |
919 | ||
920 | if (inf->vfork_parent->pending_detach) | |
921 | { | |
922 | struct thread_info *tp; | |
6c95b8df PA |
923 | struct program_space *pspace; |
924 | struct address_space *aspace; | |
925 | ||
1777feb0 | 926 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 927 | |
68c9da30 PA |
928 | inf->vfork_parent->pending_detach = 0; |
929 | ||
5ed8105e PA |
930 | gdb::optional<scoped_restore_exited_inferior> |
931 | maybe_restore_inferior; | |
932 | gdb::optional<scoped_restore_current_pspace_and_thread> | |
933 | maybe_restore_thread; | |
934 | ||
935 | /* If we're handling a child exit, then inferior_ptid points | |
936 | at the inferior's pid, not to a thread. */ | |
f50f4e56 | 937 | if (!exec) |
5ed8105e | 938 | maybe_restore_inferior.emplace (); |
f50f4e56 | 939 | else |
5ed8105e | 940 | maybe_restore_thread.emplace (); |
6c95b8df PA |
941 | |
942 | /* We're letting loose of the parent. */ | |
00431a78 PA |
943 | tp = any_live_thread_of_inferior (inf->vfork_parent); |
944 | switch_to_thread (tp); | |
6c95b8df PA |
945 | |
946 | /* We're about to detach from the parent, which implicitly | |
947 | removes breakpoints from its address space. There's a | |
948 | catch here: we want to reuse the spaces for the child, | |
949 | but, parent/child are still sharing the pspace at this | |
950 | point, although the exec in reality makes the kernel give | |
951 | the child a fresh set of new pages. The problem here is | |
952 | that the breakpoints module being unaware of this, would | |
953 | likely chose the child process to write to the parent | |
954 | address space. Swapping the child temporarily away from | |
955 | the spaces has the desired effect. Yes, this is "sort | |
956 | of" a hack. */ | |
957 | ||
958 | pspace = inf->pspace; | |
959 | aspace = inf->aspace; | |
960 | inf->aspace = NULL; | |
961 | inf->pspace = NULL; | |
962 | ||
f67c0c91 | 963 | if (print_inferior_events) |
6c95b8df | 964 | { |
f67c0c91 | 965 | const char *pidstr |
f2907e49 | 966 | = target_pid_to_str (ptid_t (inf->vfork_parent->pid)); |
f67c0c91 | 967 | |
223ffa71 | 968 | target_terminal::ours_for_output (); |
6c95b8df PA |
969 | |
970 | if (exec) | |
6f259a23 DB |
971 | { |
972 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 SDJ |
973 | _("[Detaching vfork parent %s " |
974 | "after child exec]\n"), pidstr); | |
6f259a23 | 975 | } |
6c95b8df | 976 | else |
6f259a23 DB |
977 | { |
978 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 SDJ |
979 | _("[Detaching vfork parent %s " |
980 | "after child exit]\n"), pidstr); | |
6f259a23 | 981 | } |
6c95b8df PA |
982 | } |
983 | ||
6e1e1966 | 984 | target_detach (inf->vfork_parent, 0); |
6c95b8df PA |
985 | |
986 | /* Put it back. */ | |
987 | inf->pspace = pspace; | |
988 | inf->aspace = aspace; | |
6c95b8df PA |
989 | } |
990 | else if (exec) | |
991 | { | |
992 | /* We're staying attached to the parent, so, really give the | |
993 | child a new address space. */ | |
564b1e3f | 994 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
995 | inf->aspace = inf->pspace->aspace; |
996 | inf->removable = 1; | |
997 | set_current_program_space (inf->pspace); | |
998 | ||
999 | resume_parent = inf->vfork_parent->pid; | |
1000 | ||
1001 | /* Break the bonds. */ | |
1002 | inf->vfork_parent->vfork_child = NULL; | |
1003 | } | |
1004 | else | |
1005 | { | |
6c95b8df PA |
1006 | struct program_space *pspace; |
1007 | ||
1008 | /* If this is a vfork child exiting, then the pspace and | |
1009 | aspaces were shared with the parent. Since we're | |
1010 | reporting the process exit, we'll be mourning all that is | |
1011 | found in the address space, and switching to null_ptid, | |
1012 | preparing to start a new inferior. But, since we don't | |
1013 | want to clobber the parent's address/program spaces, we | |
1014 | go ahead and create a new one for this exiting | |
1015 | inferior. */ | |
1016 | ||
5ed8105e PA |
1017 | /* Switch to null_ptid while running clone_program_space, so |
1018 | that clone_program_space doesn't want to read the | |
1019 | selected frame of a dead process. */ | |
1020 | scoped_restore restore_ptid | |
1021 | = make_scoped_restore (&inferior_ptid, null_ptid); | |
6c95b8df PA |
1022 | |
1023 | /* This inferior is dead, so avoid giving the breakpoints | |
1024 | module the option to write through to it (cloning a | |
1025 | program space resets breakpoints). */ | |
1026 | inf->aspace = NULL; | |
1027 | inf->pspace = NULL; | |
564b1e3f | 1028 | pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
1029 | set_current_program_space (pspace); |
1030 | inf->removable = 1; | |
7dcd53a0 | 1031 | inf->symfile_flags = SYMFILE_NO_READ; |
6c95b8df PA |
1032 | clone_program_space (pspace, inf->vfork_parent->pspace); |
1033 | inf->pspace = pspace; | |
1034 | inf->aspace = pspace->aspace; | |
1035 | ||
6c95b8df PA |
1036 | resume_parent = inf->vfork_parent->pid; |
1037 | /* Break the bonds. */ | |
1038 | inf->vfork_parent->vfork_child = NULL; | |
1039 | } | |
1040 | ||
1041 | inf->vfork_parent = NULL; | |
1042 | ||
1043 | gdb_assert (current_program_space == inf->pspace); | |
1044 | ||
1045 | if (non_stop && resume_parent != -1) | |
1046 | { | |
1047 | /* If the user wanted the parent to be running, let it go | |
1048 | free now. */ | |
5ed8105e | 1049 | scoped_restore_current_thread restore_thread; |
6c95b8df PA |
1050 | |
1051 | if (debug_infrun) | |
3e43a32a MS |
1052 | fprintf_unfiltered (gdb_stdlog, |
1053 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
1054 | resume_parent); |
1055 | ||
1056 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1057 | } |
1058 | } | |
1059 | } | |
1060 | ||
eb6c553b | 1061 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1062 | |
1063 | static const char follow_exec_mode_new[] = "new"; | |
1064 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1065 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1066 | { |
1067 | follow_exec_mode_new, | |
1068 | follow_exec_mode_same, | |
1069 | NULL, | |
1070 | }; | |
1071 | ||
1072 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1073 | static void | |
1074 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1075 | struct cmd_list_element *c, const char *value) | |
1076 | { | |
1077 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1078 | } | |
1079 | ||
ecf45d2c | 1080 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1081 | |
c906108c | 1082 | static void |
ecf45d2c | 1083 | follow_exec (ptid_t ptid, char *exec_file_target) |
c906108c | 1084 | { |
6c95b8df | 1085 | struct inferior *inf = current_inferior (); |
e99b03dc | 1086 | int pid = ptid.pid (); |
94585166 | 1087 | ptid_t process_ptid; |
7a292a7a | 1088 | |
c906108c SS |
1089 | /* This is an exec event that we actually wish to pay attention to. |
1090 | Refresh our symbol table to the newly exec'd program, remove any | |
1091 | momentary bp's, etc. | |
1092 | ||
1093 | If there are breakpoints, they aren't really inserted now, | |
1094 | since the exec() transformed our inferior into a fresh set | |
1095 | of instructions. | |
1096 | ||
1097 | We want to preserve symbolic breakpoints on the list, since | |
1098 | we have hopes that they can be reset after the new a.out's | |
1099 | symbol table is read. | |
1100 | ||
1101 | However, any "raw" breakpoints must be removed from the list | |
1102 | (e.g., the solib bp's), since their address is probably invalid | |
1103 | now. | |
1104 | ||
1105 | And, we DON'T want to call delete_breakpoints() here, since | |
1106 | that may write the bp's "shadow contents" (the instruction | |
1107 | value that was overwritten witha TRAP instruction). Since | |
1777feb0 | 1108 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1109 | |
1110 | mark_breakpoints_out (); | |
1111 | ||
95e50b27 PA |
1112 | /* The target reports the exec event to the main thread, even if |
1113 | some other thread does the exec, and even if the main thread was | |
1114 | stopped or already gone. We may still have non-leader threads of | |
1115 | the process on our list. E.g., on targets that don't have thread | |
1116 | exit events (like remote); or on native Linux in non-stop mode if | |
1117 | there were only two threads in the inferior and the non-leader | |
1118 | one is the one that execs (and nothing forces an update of the | |
1119 | thread list up to here). When debugging remotely, it's best to | |
1120 | avoid extra traffic, when possible, so avoid syncing the thread | |
1121 | list with the target, and instead go ahead and delete all threads | |
1122 | of the process but one that reported the event. Note this must | |
1123 | be done before calling update_breakpoints_after_exec, as | |
1124 | otherwise clearing the threads' resources would reference stale | |
1125 | thread breakpoints -- it may have been one of these threads that | |
1126 | stepped across the exec. We could just clear their stepping | |
1127 | states, but as long as we're iterating, might as well delete | |
1128 | them. Deleting them now rather than at the next user-visible | |
1129 | stop provides a nicer sequence of events for user and MI | |
1130 | notifications. */ | |
08036331 | 1131 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1132 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1133 | delete_thread (th); |
95e50b27 PA |
1134 | |
1135 | /* We also need to clear any left over stale state for the | |
1136 | leader/event thread. E.g., if there was any step-resume | |
1137 | breakpoint or similar, it's gone now. We cannot truly | |
1138 | step-to-next statement through an exec(). */ | |
08036331 | 1139 | thread_info *th = inferior_thread (); |
8358c15c | 1140 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1141 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1142 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1143 | th->control.step_range_start = 0; |
1144 | th->control.step_range_end = 0; | |
c906108c | 1145 | |
95e50b27 PA |
1146 | /* The user may have had the main thread held stopped in the |
1147 | previous image (e.g., schedlock on, or non-stop). Release | |
1148 | it now. */ | |
a75724bc PA |
1149 | th->stop_requested = 0; |
1150 | ||
95e50b27 PA |
1151 | update_breakpoints_after_exec (); |
1152 | ||
1777feb0 | 1153 | /* What is this a.out's name? */ |
f2907e49 | 1154 | process_ptid = ptid_t (pid); |
6c95b8df | 1155 | printf_unfiltered (_("%s is executing new program: %s\n"), |
94585166 | 1156 | target_pid_to_str (process_ptid), |
ecf45d2c | 1157 | exec_file_target); |
c906108c SS |
1158 | |
1159 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1160 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1161 | |
c906108c | 1162 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
1163 | |
1164 | breakpoint_init_inferior (inf_execd); | |
e85a822c | 1165 | |
797bc1cb TT |
1166 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1167 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1168 | |
ecf45d2c SL |
1169 | /* If we were unable to map the executable target pathname onto a host |
1170 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1171 | is confusing. Maybe it would even be better to stop at this point | |
1172 | so that the user can specify a file manually before continuing. */ | |
1173 | if (exec_file_host == NULL) | |
1174 | warning (_("Could not load symbols for executable %s.\n" | |
1175 | "Do you need \"set sysroot\"?"), | |
1176 | exec_file_target); | |
c906108c | 1177 | |
cce9b6bf PA |
1178 | /* Reset the shared library package. This ensures that we get a |
1179 | shlib event when the child reaches "_start", at which point the | |
1180 | dld will have had a chance to initialize the child. */ | |
1181 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1182 | we don't want those to be satisfied by the libraries of the | |
1183 | previous incarnation of this process. */ | |
1184 | no_shared_libraries (NULL, 0); | |
1185 | ||
6c95b8df PA |
1186 | if (follow_exec_mode_string == follow_exec_mode_new) |
1187 | { | |
6c95b8df PA |
1188 | /* The user wants to keep the old inferior and program spaces |
1189 | around. Create a new fresh one, and switch to it. */ | |
1190 | ||
35ed81d4 SM |
1191 | /* Do exit processing for the original inferior before setting the new |
1192 | inferior's pid. Having two inferiors with the same pid would confuse | |
1193 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1194 | old to the new inferior. */ | |
1195 | inf = add_inferior_with_spaces (); | |
1196 | swap_terminal_info (inf, current_inferior ()); | |
057302ce | 1197 | exit_inferior_silent (current_inferior ()); |
17d8546e | 1198 | |
94585166 | 1199 | inf->pid = pid; |
ecf45d2c | 1200 | target_follow_exec (inf, exec_file_target); |
6c95b8df PA |
1201 | |
1202 | set_current_inferior (inf); | |
94585166 | 1203 | set_current_program_space (inf->pspace); |
c4c17fb0 | 1204 | add_thread (ptid); |
6c95b8df | 1205 | } |
9107fc8d PA |
1206 | else |
1207 | { | |
1208 | /* The old description may no longer be fit for the new image. | |
1209 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1210 | old description; we'll read a new one below. No need to do | |
1211 | this on "follow-exec-mode new", as the old inferior stays | |
1212 | around (its description is later cleared/refetched on | |
1213 | restart). */ | |
1214 | target_clear_description (); | |
1215 | } | |
6c95b8df PA |
1216 | |
1217 | gdb_assert (current_program_space == inf->pspace); | |
1218 | ||
ecf45d2c SL |
1219 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1220 | because the proper displacement for a PIE (Position Independent | |
1221 | Executable) main symbol file will only be computed by | |
1222 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1223 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1224 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1225 | |
9107fc8d PA |
1226 | /* If the target can specify a description, read it. Must do this |
1227 | after flipping to the new executable (because the target supplied | |
1228 | description must be compatible with the executable's | |
1229 | architecture, and the old executable may e.g., be 32-bit, while | |
1230 | the new one 64-bit), and before anything involving memory or | |
1231 | registers. */ | |
1232 | target_find_description (); | |
1233 | ||
268a4a75 | 1234 | solib_create_inferior_hook (0); |
c906108c | 1235 | |
4efc6507 DE |
1236 | jit_inferior_created_hook (); |
1237 | ||
c1e56572 JK |
1238 | breakpoint_re_set (); |
1239 | ||
c906108c SS |
1240 | /* Reinsert all breakpoints. (Those which were symbolic have |
1241 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1242 | to symbol_file_command...). */ |
c906108c SS |
1243 | insert_breakpoints (); |
1244 | ||
1245 | /* The next resume of this inferior should bring it to the shlib | |
1246 | startup breakpoints. (If the user had also set bp's on | |
1247 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1248 | matically get reset there in the new process.). */ |
c906108c SS |
1249 | } |
1250 | ||
c2829269 PA |
1251 | /* The queue of threads that need to do a step-over operation to get |
1252 | past e.g., a breakpoint. What technique is used to step over the | |
1253 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1254 | same queue, to maintain rough temporal order of execution, in order | |
1255 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1256 | constantly stepping the same couple threads past their breakpoints | |
1257 | over and over, if the single-step finish fast enough. */ | |
1258 | struct thread_info *step_over_queue_head; | |
1259 | ||
6c4cfb24 PA |
1260 | /* Bit flags indicating what the thread needs to step over. */ |
1261 | ||
8d297bbf | 1262 | enum step_over_what_flag |
6c4cfb24 PA |
1263 | { |
1264 | /* Step over a breakpoint. */ | |
1265 | STEP_OVER_BREAKPOINT = 1, | |
1266 | ||
1267 | /* Step past a non-continuable watchpoint, in order to let the | |
1268 | instruction execute so we can evaluate the watchpoint | |
1269 | expression. */ | |
1270 | STEP_OVER_WATCHPOINT = 2 | |
1271 | }; | |
8d297bbf | 1272 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1273 | |
963f9c80 | 1274 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1275 | |
1276 | struct step_over_info | |
1277 | { | |
963f9c80 PA |
1278 | /* If we're stepping past a breakpoint, this is the address space |
1279 | and address of the instruction the breakpoint is set at. We'll | |
1280 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1281 | non-NULL. */ | |
8b86c959 | 1282 | const address_space *aspace; |
31e77af2 | 1283 | CORE_ADDR address; |
963f9c80 PA |
1284 | |
1285 | /* The instruction being stepped over triggers a nonsteppable | |
1286 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1287 | int nonsteppable_watchpoint_p; | |
21edc42f YQ |
1288 | |
1289 | /* The thread's global number. */ | |
1290 | int thread; | |
31e77af2 PA |
1291 | }; |
1292 | ||
1293 | /* The step-over info of the location that is being stepped over. | |
1294 | ||
1295 | Note that with async/breakpoint always-inserted mode, a user might | |
1296 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1297 | being stepped over. As setting a new breakpoint inserts all | |
1298 | breakpoints, we need to make sure the breakpoint being stepped over | |
1299 | isn't inserted then. We do that by only clearing the step-over | |
1300 | info when the step-over is actually finished (or aborted). | |
1301 | ||
1302 | Presently GDB can only step over one breakpoint at any given time. | |
1303 | Given threads that can't run code in the same address space as the | |
1304 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1305 | to step-over at most one breakpoint per address space (so this info | |
1306 | could move to the address space object if/when GDB is extended). | |
1307 | The set of breakpoints being stepped over will normally be much | |
1308 | smaller than the set of all breakpoints, so a flag in the | |
1309 | breakpoint location structure would be wasteful. A separate list | |
1310 | also saves complexity and run-time, as otherwise we'd have to go | |
1311 | through all breakpoint locations clearing their flag whenever we | |
1312 | start a new sequence. Similar considerations weigh against storing | |
1313 | this info in the thread object. Plus, not all step overs actually | |
1314 | have breakpoint locations -- e.g., stepping past a single-step | |
1315 | breakpoint, or stepping to complete a non-continuable | |
1316 | watchpoint. */ | |
1317 | static struct step_over_info step_over_info; | |
1318 | ||
1319 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1320 | stepping over. |
1321 | N.B. We record the aspace and address now, instead of say just the thread, | |
1322 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1323 | |
1324 | static void | |
8b86c959 | 1325 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1326 | int nonsteppable_watchpoint_p, |
1327 | int thread) | |
31e77af2 PA |
1328 | { |
1329 | step_over_info.aspace = aspace; | |
1330 | step_over_info.address = address; | |
963f9c80 | 1331 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1332 | step_over_info.thread = thread; |
31e77af2 PA |
1333 | } |
1334 | ||
1335 | /* Called when we're not longer stepping over a breakpoint / an | |
1336 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1337 | ||
1338 | static void | |
1339 | clear_step_over_info (void) | |
1340 | { | |
372316f1 PA |
1341 | if (debug_infrun) |
1342 | fprintf_unfiltered (gdb_stdlog, | |
1343 | "infrun: clear_step_over_info\n"); | |
31e77af2 PA |
1344 | step_over_info.aspace = NULL; |
1345 | step_over_info.address = 0; | |
963f9c80 | 1346 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1347 | step_over_info.thread = -1; |
31e77af2 PA |
1348 | } |
1349 | ||
7f89fd65 | 1350 | /* See infrun.h. */ |
31e77af2 PA |
1351 | |
1352 | int | |
1353 | stepping_past_instruction_at (struct address_space *aspace, | |
1354 | CORE_ADDR address) | |
1355 | { | |
1356 | return (step_over_info.aspace != NULL | |
1357 | && breakpoint_address_match (aspace, address, | |
1358 | step_over_info.aspace, | |
1359 | step_over_info.address)); | |
1360 | } | |
1361 | ||
963f9c80 PA |
1362 | /* See infrun.h. */ |
1363 | ||
21edc42f YQ |
1364 | int |
1365 | thread_is_stepping_over_breakpoint (int thread) | |
1366 | { | |
1367 | return (step_over_info.thread != -1 | |
1368 | && thread == step_over_info.thread); | |
1369 | } | |
1370 | ||
1371 | /* See infrun.h. */ | |
1372 | ||
963f9c80 PA |
1373 | int |
1374 | stepping_past_nonsteppable_watchpoint (void) | |
1375 | { | |
1376 | return step_over_info.nonsteppable_watchpoint_p; | |
1377 | } | |
1378 | ||
6cc83d2a PA |
1379 | /* Returns true if step-over info is valid. */ |
1380 | ||
1381 | static int | |
1382 | step_over_info_valid_p (void) | |
1383 | { | |
963f9c80 PA |
1384 | return (step_over_info.aspace != NULL |
1385 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1386 | } |
1387 | ||
c906108c | 1388 | \f |
237fc4c9 PA |
1389 | /* Displaced stepping. */ |
1390 | ||
1391 | /* In non-stop debugging mode, we must take special care to manage | |
1392 | breakpoints properly; in particular, the traditional strategy for | |
1393 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1394 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1395 | breakpoint it has hit while ensuring that other threads running | |
1396 | concurrently will hit the breakpoint as they should. | |
1397 | ||
1398 | The traditional way to step a thread T off a breakpoint in a | |
1399 | multi-threaded program in all-stop mode is as follows: | |
1400 | ||
1401 | a0) Initially, all threads are stopped, and breakpoints are not | |
1402 | inserted. | |
1403 | a1) We single-step T, leaving breakpoints uninserted. | |
1404 | a2) We insert breakpoints, and resume all threads. | |
1405 | ||
1406 | In non-stop debugging, however, this strategy is unsuitable: we | |
1407 | don't want to have to stop all threads in the system in order to | |
1408 | continue or step T past a breakpoint. Instead, we use displaced | |
1409 | stepping: | |
1410 | ||
1411 | n0) Initially, T is stopped, other threads are running, and | |
1412 | breakpoints are inserted. | |
1413 | n1) We copy the instruction "under" the breakpoint to a separate | |
1414 | location, outside the main code stream, making any adjustments | |
1415 | to the instruction, register, and memory state as directed by | |
1416 | T's architecture. | |
1417 | n2) We single-step T over the instruction at its new location. | |
1418 | n3) We adjust the resulting register and memory state as directed | |
1419 | by T's architecture. This includes resetting T's PC to point | |
1420 | back into the main instruction stream. | |
1421 | n4) We resume T. | |
1422 | ||
1423 | This approach depends on the following gdbarch methods: | |
1424 | ||
1425 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1426 | indicate where to copy the instruction, and how much space must | |
1427 | be reserved there. We use these in step n1. | |
1428 | ||
1429 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1430 | address, and makes any necessary adjustments to the instruction, | |
1431 | register contents, and memory. We use this in step n1. | |
1432 | ||
1433 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
1434 | we have successfuly single-stepped the instruction, to yield the | |
1435 | same effect the instruction would have had if we had executed it | |
1436 | at its original address. We use this in step n3. | |
1437 | ||
237fc4c9 PA |
1438 | The gdbarch_displaced_step_copy_insn and |
1439 | gdbarch_displaced_step_fixup functions must be written so that | |
1440 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1441 | single-stepping across the copied instruction, and then applying | |
1442 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1443 | thread's memory and registers as stepping the instruction in place | |
1444 | would have. Exactly which responsibilities fall to the copy and | |
1445 | which fall to the fixup is up to the author of those functions. | |
1446 | ||
1447 | See the comments in gdbarch.sh for details. | |
1448 | ||
1449 | Note that displaced stepping and software single-step cannot | |
1450 | currently be used in combination, although with some care I think | |
1451 | they could be made to. Software single-step works by placing | |
1452 | breakpoints on all possible subsequent instructions; if the | |
1453 | displaced instruction is a PC-relative jump, those breakpoints | |
1454 | could fall in very strange places --- on pages that aren't | |
1455 | executable, or at addresses that are not proper instruction | |
1456 | boundaries. (We do generally let other threads run while we wait | |
1457 | to hit the software single-step breakpoint, and they might | |
1458 | encounter such a corrupted instruction.) One way to work around | |
1459 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1460 | simulate the effect of PC-relative instructions (and return NULL) | |
1461 | on architectures that use software single-stepping. | |
1462 | ||
1463 | In non-stop mode, we can have independent and simultaneous step | |
1464 | requests, so more than one thread may need to simultaneously step | |
1465 | over a breakpoint. The current implementation assumes there is | |
1466 | only one scratch space per process. In this case, we have to | |
1467 | serialize access to the scratch space. If thread A wants to step | |
1468 | over a breakpoint, but we are currently waiting for some other | |
1469 | thread to complete a displaced step, we leave thread A stopped and | |
1470 | place it in the displaced_step_request_queue. Whenever a displaced | |
1471 | step finishes, we pick the next thread in the queue and start a new | |
1472 | displaced step operation on it. See displaced_step_prepare and | |
1473 | displaced_step_fixup for details. */ | |
1474 | ||
cfba9872 SM |
1475 | /* Default destructor for displaced_step_closure. */ |
1476 | ||
1477 | displaced_step_closure::~displaced_step_closure () = default; | |
1478 | ||
fc1cf338 PA |
1479 | /* Get the displaced stepping state of process PID. */ |
1480 | ||
39a36629 | 1481 | static displaced_step_inferior_state * |
00431a78 | 1482 | get_displaced_stepping_state (inferior *inf) |
fc1cf338 | 1483 | { |
d20172fc | 1484 | return &inf->displaced_step_state; |
fc1cf338 PA |
1485 | } |
1486 | ||
372316f1 PA |
1487 | /* Returns true if any inferior has a thread doing a displaced |
1488 | step. */ | |
1489 | ||
39a36629 SM |
1490 | static bool |
1491 | displaced_step_in_progress_any_inferior () | |
372316f1 | 1492 | { |
d20172fc | 1493 | for (inferior *i : all_inferiors ()) |
39a36629 | 1494 | { |
d20172fc | 1495 | if (i->displaced_step_state.step_thread != nullptr) |
39a36629 SM |
1496 | return true; |
1497 | } | |
372316f1 | 1498 | |
39a36629 | 1499 | return false; |
372316f1 PA |
1500 | } |
1501 | ||
c0987663 YQ |
1502 | /* Return true if thread represented by PTID is doing a displaced |
1503 | step. */ | |
1504 | ||
1505 | static int | |
00431a78 | 1506 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1507 | { |
00431a78 | 1508 | gdb_assert (thread != NULL); |
c0987663 | 1509 | |
d20172fc | 1510 | return get_displaced_stepping_state (thread->inf)->step_thread == thread; |
c0987663 YQ |
1511 | } |
1512 | ||
8f572e5c PA |
1513 | /* Return true if process PID has a thread doing a displaced step. */ |
1514 | ||
1515 | static int | |
00431a78 | 1516 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1517 | { |
d20172fc | 1518 | return get_displaced_stepping_state (inf)->step_thread != nullptr; |
fc1cf338 PA |
1519 | } |
1520 | ||
a42244db YQ |
1521 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1522 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1523 | return NULL. */ | |
1524 | ||
1525 | struct displaced_step_closure* | |
1526 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1527 | { | |
d20172fc | 1528 | displaced_step_inferior_state *displaced |
00431a78 | 1529 | = get_displaced_stepping_state (current_inferior ()); |
a42244db YQ |
1530 | |
1531 | /* If checking the mode of displaced instruction in copy area. */ | |
d20172fc | 1532 | if (displaced->step_thread != nullptr |
00431a78 | 1533 | && displaced->step_copy == addr) |
a42244db YQ |
1534 | return displaced->step_closure; |
1535 | ||
1536 | return NULL; | |
1537 | } | |
1538 | ||
fc1cf338 PA |
1539 | static void |
1540 | infrun_inferior_exit (struct inferior *inf) | |
1541 | { | |
d20172fc | 1542 | inf->displaced_step_state.reset (); |
fc1cf338 | 1543 | } |
237fc4c9 | 1544 | |
fff08868 HZ |
1545 | /* If ON, and the architecture supports it, GDB will use displaced |
1546 | stepping to step over breakpoints. If OFF, or if the architecture | |
1547 | doesn't support it, GDB will instead use the traditional | |
1548 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1549 | decide which technique to use to step over breakpoints depending on | |
1550 | which of all-stop or non-stop mode is active --- displaced stepping | |
1551 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1552 | ||
72d0e2c5 | 1553 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1554 | |
237fc4c9 PA |
1555 | static void |
1556 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1557 | struct cmd_list_element *c, | |
1558 | const char *value) | |
1559 | { | |
72d0e2c5 | 1560 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1561 | fprintf_filtered (file, |
1562 | _("Debugger's willingness to use displaced stepping " | |
1563 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1564 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1565 | else |
3e43a32a MS |
1566 | fprintf_filtered (file, |
1567 | _("Debugger's willingness to use displaced stepping " | |
1568 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1569 | } |
1570 | ||
fff08868 | 1571 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1572 | over breakpoints of thread TP. */ |
fff08868 | 1573 | |
237fc4c9 | 1574 | static int |
3fc8eb30 | 1575 | use_displaced_stepping (struct thread_info *tp) |
237fc4c9 | 1576 | { |
00431a78 | 1577 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1578 | struct gdbarch *gdbarch = regcache->arch (); |
d20172fc SM |
1579 | displaced_step_inferior_state *displaced_state |
1580 | = get_displaced_stepping_state (tp->inf); | |
3fc8eb30 | 1581 | |
fbea99ea PA |
1582 | return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO |
1583 | && target_is_non_stop_p ()) | |
72d0e2c5 | 1584 | || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) |
96429cc8 | 1585 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
3fc8eb30 | 1586 | && find_record_target () == NULL |
d20172fc | 1587 | && !displaced_state->failed_before); |
237fc4c9 PA |
1588 | } |
1589 | ||
1590 | /* Clean out any stray displaced stepping state. */ | |
1591 | static void | |
fc1cf338 | 1592 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1593 | { |
1594 | /* Indicate that there is no cleanup pending. */ | |
00431a78 | 1595 | displaced->step_thread = nullptr; |
237fc4c9 | 1596 | |
cfba9872 | 1597 | delete displaced->step_closure; |
6d45d4b4 | 1598 | displaced->step_closure = NULL; |
237fc4c9 PA |
1599 | } |
1600 | ||
1601 | static void | |
fc1cf338 | 1602 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1603 | { |
9a3c8263 SM |
1604 | struct displaced_step_inferior_state *state |
1605 | = (struct displaced_step_inferior_state *) arg; | |
fc1cf338 PA |
1606 | |
1607 | displaced_step_clear (state); | |
237fc4c9 PA |
1608 | } |
1609 | ||
1610 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1611 | void | |
1612 | displaced_step_dump_bytes (struct ui_file *file, | |
1613 | const gdb_byte *buf, | |
1614 | size_t len) | |
1615 | { | |
1616 | int i; | |
1617 | ||
1618 | for (i = 0; i < len; i++) | |
1619 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1620 | fputs_unfiltered ("\n", file); | |
1621 | } | |
1622 | ||
1623 | /* Prepare to single-step, using displaced stepping. | |
1624 | ||
1625 | Note that we cannot use displaced stepping when we have a signal to | |
1626 | deliver. If we have a signal to deliver and an instruction to step | |
1627 | over, then after the step, there will be no indication from the | |
1628 | target whether the thread entered a signal handler or ignored the | |
1629 | signal and stepped over the instruction successfully --- both cases | |
1630 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1631 | fixup, and in the second case we must --- but we can't tell which. | |
1632 | Comments in the code for 'random signals' in handle_inferior_event | |
1633 | explain how we handle this case instead. | |
1634 | ||
1635 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1636 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1637 | if this instruction can't be displaced stepped. */ | |
1638 | ||
237fc4c9 | 1639 | static int |
00431a78 | 1640 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1641 | { |
00431a78 | 1642 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1643 | struct gdbarch *gdbarch = regcache->arch (); |
8b86c959 | 1644 | const address_space *aspace = regcache->aspace (); |
237fc4c9 PA |
1645 | CORE_ADDR original, copy; |
1646 | ULONGEST len; | |
1647 | struct displaced_step_closure *closure; | |
9e529e1d | 1648 | int status; |
237fc4c9 PA |
1649 | |
1650 | /* We should never reach this function if the architecture does not | |
1651 | support displaced stepping. */ | |
1652 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1653 | ||
c2829269 PA |
1654 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1655 | gdb_assert (tp->control.trap_expected); | |
1656 | ||
c1e36e3e PA |
1657 | /* Disable range stepping while executing in the scratch pad. We |
1658 | want a single-step even if executing the displaced instruction in | |
1659 | the scratch buffer lands within the stepping range (e.g., a | |
1660 | jump/branch). */ | |
1661 | tp->control.may_range_step = 0; | |
1662 | ||
fc1cf338 PA |
1663 | /* We have to displaced step one thread at a time, as we only have |
1664 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1665 | |
d20172fc SM |
1666 | displaced_step_inferior_state *displaced |
1667 | = get_displaced_stepping_state (tp->inf); | |
fc1cf338 | 1668 | |
00431a78 | 1669 | if (displaced->step_thread != nullptr) |
237fc4c9 PA |
1670 | { |
1671 | /* Already waiting for a displaced step to finish. Defer this | |
1672 | request and place in queue. */ | |
237fc4c9 PA |
1673 | |
1674 | if (debug_displaced) | |
1675 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1676 | "displaced: deferring step of %s\n", |
00431a78 | 1677 | target_pid_to_str (tp->ptid)); |
237fc4c9 | 1678 | |
c2829269 | 1679 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1680 | return 0; |
1681 | } | |
1682 | else | |
1683 | { | |
1684 | if (debug_displaced) | |
1685 | fprintf_unfiltered (gdb_stdlog, | |
1686 | "displaced: stepping %s now\n", | |
00431a78 | 1687 | target_pid_to_str (tp->ptid)); |
237fc4c9 PA |
1688 | } |
1689 | ||
fc1cf338 | 1690 | displaced_step_clear (displaced); |
237fc4c9 | 1691 | |
00431a78 PA |
1692 | scoped_restore_current_thread restore_thread; |
1693 | ||
1694 | switch_to_thread (tp); | |
ad53cd71 | 1695 | |
515630c5 | 1696 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1697 | |
1698 | copy = gdbarch_displaced_step_location (gdbarch); | |
1699 | len = gdbarch_max_insn_length (gdbarch); | |
1700 | ||
d35ae833 PA |
1701 | if (breakpoint_in_range_p (aspace, copy, len)) |
1702 | { | |
1703 | /* There's a breakpoint set in the scratch pad location range | |
1704 | (which is usually around the entry point). We'd either | |
1705 | install it before resuming, which would overwrite/corrupt the | |
1706 | scratch pad, or if it was already inserted, this displaced | |
1707 | step would overwrite it. The latter is OK in the sense that | |
1708 | we already assume that no thread is going to execute the code | |
1709 | in the scratch pad range (after initial startup) anyway, but | |
1710 | the former is unacceptable. Simply punt and fallback to | |
1711 | stepping over this breakpoint in-line. */ | |
1712 | if (debug_displaced) | |
1713 | { | |
1714 | fprintf_unfiltered (gdb_stdlog, | |
1715 | "displaced: breakpoint set in scratch pad. " | |
1716 | "Stepping over breakpoint in-line instead.\n"); | |
1717 | } | |
1718 | ||
d35ae833 PA |
1719 | return -1; |
1720 | } | |
1721 | ||
237fc4c9 | 1722 | /* Save the original contents of the copy area. */ |
d20172fc SM |
1723 | displaced->step_saved_copy.resize (len); |
1724 | status = target_read_memory (copy, displaced->step_saved_copy.data (), len); | |
9e529e1d JK |
1725 | if (status != 0) |
1726 | throw_error (MEMORY_ERROR, | |
1727 | _("Error accessing memory address %s (%s) for " | |
1728 | "displaced-stepping scratch space."), | |
1729 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1730 | if (debug_displaced) |
1731 | { | |
5af949e3 UW |
1732 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1733 | paddress (gdbarch, copy)); | |
fc1cf338 | 1734 | displaced_step_dump_bytes (gdb_stdlog, |
d20172fc | 1735 | displaced->step_saved_copy.data (), |
fc1cf338 | 1736 | len); |
237fc4c9 PA |
1737 | }; |
1738 | ||
1739 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1740 | original, copy, regcache); |
7f03bd92 PA |
1741 | if (closure == NULL) |
1742 | { | |
1743 | /* The architecture doesn't know how or want to displaced step | |
1744 | this instruction or instruction sequence. Fallback to | |
1745 | stepping over the breakpoint in-line. */ | |
7f03bd92 PA |
1746 | return -1; |
1747 | } | |
237fc4c9 | 1748 | |
9f5a595d UW |
1749 | /* Save the information we need to fix things up if the step |
1750 | succeeds. */ | |
00431a78 | 1751 | displaced->step_thread = tp; |
fc1cf338 PA |
1752 | displaced->step_gdbarch = gdbarch; |
1753 | displaced->step_closure = closure; | |
1754 | displaced->step_original = original; | |
1755 | displaced->step_copy = copy; | |
9f5a595d | 1756 | |
d20172fc SM |
1757 | cleanup *ignore_cleanups |
1758 | = make_cleanup (displaced_step_clear_cleanup, displaced); | |
237fc4c9 PA |
1759 | |
1760 | /* Resume execution at the copy. */ | |
515630c5 | 1761 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1762 | |
ad53cd71 PA |
1763 | discard_cleanups (ignore_cleanups); |
1764 | ||
237fc4c9 | 1765 | if (debug_displaced) |
5af949e3 UW |
1766 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1767 | paddress (gdbarch, copy)); | |
237fc4c9 | 1768 | |
237fc4c9 PA |
1769 | return 1; |
1770 | } | |
1771 | ||
3fc8eb30 PA |
1772 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1773 | attempts at displaced stepping if we get a memory error. */ | |
1774 | ||
1775 | static int | |
00431a78 | 1776 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 PA |
1777 | { |
1778 | int prepared = -1; | |
1779 | ||
1780 | TRY | |
1781 | { | |
00431a78 | 1782 | prepared = displaced_step_prepare_throw (thread); |
3fc8eb30 PA |
1783 | } |
1784 | CATCH (ex, RETURN_MASK_ERROR) | |
1785 | { | |
1786 | struct displaced_step_inferior_state *displaced_state; | |
1787 | ||
16b41842 PA |
1788 | if (ex.error != MEMORY_ERROR |
1789 | && ex.error != NOT_SUPPORTED_ERROR) | |
3fc8eb30 PA |
1790 | throw_exception (ex); |
1791 | ||
1792 | if (debug_infrun) | |
1793 | { | |
1794 | fprintf_unfiltered (gdb_stdlog, | |
1795 | "infrun: disabling displaced stepping: %s\n", | |
1796 | ex.message); | |
1797 | } | |
1798 | ||
1799 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1800 | "auto". */ | |
1801 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1802 | { | |
fd7dcb94 | 1803 | warning (_("disabling displaced stepping: %s"), |
3fc8eb30 PA |
1804 | ex.message); |
1805 | } | |
1806 | ||
1807 | /* Disable further displaced stepping attempts. */ | |
1808 | displaced_state | |
00431a78 | 1809 | = get_displaced_stepping_state (thread->inf); |
3fc8eb30 PA |
1810 | displaced_state->failed_before = 1; |
1811 | } | |
1812 | END_CATCH | |
1813 | ||
1814 | return prepared; | |
1815 | } | |
1816 | ||
237fc4c9 | 1817 | static void |
3e43a32a MS |
1818 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1819 | const gdb_byte *myaddr, int len) | |
237fc4c9 | 1820 | { |
2989a365 | 1821 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
abbb1732 | 1822 | |
237fc4c9 PA |
1823 | inferior_ptid = ptid; |
1824 | write_memory (memaddr, myaddr, len); | |
237fc4c9 PA |
1825 | } |
1826 | ||
e2d96639 YQ |
1827 | /* Restore the contents of the copy area for thread PTID. */ |
1828 | ||
1829 | static void | |
1830 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1831 | ptid_t ptid) | |
1832 | { | |
1833 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1834 | ||
1835 | write_memory_ptid (ptid, displaced->step_copy, | |
d20172fc | 1836 | displaced->step_saved_copy.data (), len); |
e2d96639 YQ |
1837 | if (debug_displaced) |
1838 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
1839 | target_pid_to_str (ptid), | |
1840 | paddress (displaced->step_gdbarch, | |
1841 | displaced->step_copy)); | |
1842 | } | |
1843 | ||
372316f1 PA |
1844 | /* If we displaced stepped an instruction successfully, adjust |
1845 | registers and memory to yield the same effect the instruction would | |
1846 | have had if we had executed it at its original address, and return | |
1847 | 1. If the instruction didn't complete, relocate the PC and return | |
1848 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1849 | ||
1850 | static int | |
00431a78 | 1851 | displaced_step_fixup (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 PA |
1852 | { |
1853 | struct cleanup *old_cleanups; | |
fc1cf338 | 1854 | struct displaced_step_inferior_state *displaced |
00431a78 | 1855 | = get_displaced_stepping_state (event_thread->inf); |
372316f1 | 1856 | int ret; |
fc1cf338 | 1857 | |
00431a78 PA |
1858 | /* Was this event for the thread we displaced? */ |
1859 | if (displaced->step_thread != event_thread) | |
372316f1 | 1860 | return 0; |
237fc4c9 | 1861 | |
fc1cf338 | 1862 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 | 1863 | |
00431a78 | 1864 | displaced_step_restore (displaced, displaced->step_thread->ptid); |
237fc4c9 | 1865 | |
cb71640d PA |
1866 | /* Fixup may need to read memory/registers. Switch to the thread |
1867 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
1868 | the current thread. */ | |
00431a78 | 1869 | switch_to_thread (event_thread); |
cb71640d | 1870 | |
237fc4c9 | 1871 | /* Did the instruction complete successfully? */ |
cb71640d PA |
1872 | if (signal == GDB_SIGNAL_TRAP |
1873 | && !(target_stopped_by_watchpoint () | |
1874 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
1875 | || target_have_steppable_watchpoint))) | |
237fc4c9 PA |
1876 | { |
1877 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
1878 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
1879 | displaced->step_closure, | |
1880 | displaced->step_original, | |
1881 | displaced->step_copy, | |
00431a78 | 1882 | get_thread_regcache (displaced->step_thread)); |
372316f1 | 1883 | ret = 1; |
237fc4c9 PA |
1884 | } |
1885 | else | |
1886 | { | |
1887 | /* Since the instruction didn't complete, all we can do is | |
1888 | relocate the PC. */ | |
00431a78 | 1889 | struct regcache *regcache = get_thread_regcache (event_thread); |
515630c5 | 1890 | CORE_ADDR pc = regcache_read_pc (regcache); |
abbb1732 | 1891 | |
fc1cf338 | 1892 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1893 | regcache_write_pc (regcache, pc); |
372316f1 | 1894 | ret = -1; |
237fc4c9 PA |
1895 | } |
1896 | ||
1897 | do_cleanups (old_cleanups); | |
1898 | ||
00431a78 | 1899 | displaced->step_thread = nullptr; |
372316f1 PA |
1900 | |
1901 | return ret; | |
c2829269 | 1902 | } |
1c5cfe86 | 1903 | |
4d9d9d04 PA |
1904 | /* Data to be passed around while handling an event. This data is |
1905 | discarded between events. */ | |
1906 | struct execution_control_state | |
1907 | { | |
1908 | ptid_t ptid; | |
1909 | /* The thread that got the event, if this was a thread event; NULL | |
1910 | otherwise. */ | |
1911 | struct thread_info *event_thread; | |
1912 | ||
1913 | struct target_waitstatus ws; | |
1914 | int stop_func_filled_in; | |
1915 | CORE_ADDR stop_func_start; | |
1916 | CORE_ADDR stop_func_end; | |
1917 | const char *stop_func_name; | |
1918 | int wait_some_more; | |
1919 | ||
1920 | /* True if the event thread hit the single-step breakpoint of | |
1921 | another thread. Thus the event doesn't cause a stop, the thread | |
1922 | needs to be single-stepped past the single-step breakpoint before | |
1923 | we can switch back to the original stepping thread. */ | |
1924 | int hit_singlestep_breakpoint; | |
1925 | }; | |
1926 | ||
1927 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1928 | |
1929 | static void | |
4d9d9d04 PA |
1930 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1931 | { | |
1932 | memset (ecs, 0, sizeof (*ecs)); | |
1933 | ecs->event_thread = tp; | |
1934 | ecs->ptid = tp->ptid; | |
1935 | } | |
1936 | ||
1937 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1938 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 1939 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1940 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1941 | |
1942 | /* Are there any pending step-over requests? If so, run all we can | |
1943 | now and return true. Otherwise, return false. */ | |
1944 | ||
1945 | static int | |
c2829269 PA |
1946 | start_step_over (void) |
1947 | { | |
1948 | struct thread_info *tp, *next; | |
1949 | ||
372316f1 PA |
1950 | /* Don't start a new step-over if we already have an in-line |
1951 | step-over operation ongoing. */ | |
1952 | if (step_over_info_valid_p ()) | |
1953 | return 0; | |
1954 | ||
c2829269 | 1955 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 1956 | { |
4d9d9d04 PA |
1957 | struct execution_control_state ecss; |
1958 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1959 | step_over_what step_what; |
372316f1 | 1960 | int must_be_in_line; |
c2829269 | 1961 | |
c65d6b55 PA |
1962 | gdb_assert (!tp->stop_requested); |
1963 | ||
c2829269 | 1964 | next = thread_step_over_chain_next (tp); |
237fc4c9 | 1965 | |
c2829269 PA |
1966 | /* If this inferior already has a displaced step in process, |
1967 | don't start a new one. */ | |
00431a78 | 1968 | if (displaced_step_in_progress (tp->inf)) |
c2829269 PA |
1969 | continue; |
1970 | ||
372316f1 PA |
1971 | step_what = thread_still_needs_step_over (tp); |
1972 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1973 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1974 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1975 | |
1976 | /* We currently stop all threads of all processes to step-over | |
1977 | in-line. If we need to start a new in-line step-over, let | |
1978 | any pending displaced steps finish first. */ | |
1979 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
1980 | return 0; | |
1981 | ||
c2829269 PA |
1982 | thread_step_over_chain_remove (tp); |
1983 | ||
1984 | if (step_over_queue_head == NULL) | |
1985 | { | |
1986 | if (debug_infrun) | |
1987 | fprintf_unfiltered (gdb_stdlog, | |
1988 | "infrun: step-over queue now empty\n"); | |
1989 | } | |
1990 | ||
372316f1 PA |
1991 | if (tp->control.trap_expected |
1992 | || tp->resumed | |
1993 | || tp->executing) | |
ad53cd71 | 1994 | { |
4d9d9d04 PA |
1995 | internal_error (__FILE__, __LINE__, |
1996 | "[%s] has inconsistent state: " | |
372316f1 | 1997 | "trap_expected=%d, resumed=%d, executing=%d\n", |
4d9d9d04 PA |
1998 | target_pid_to_str (tp->ptid), |
1999 | tp->control.trap_expected, | |
372316f1 | 2000 | tp->resumed, |
4d9d9d04 | 2001 | tp->executing); |
ad53cd71 | 2002 | } |
1c5cfe86 | 2003 | |
4d9d9d04 PA |
2004 | if (debug_infrun) |
2005 | fprintf_unfiltered (gdb_stdlog, | |
2006 | "infrun: resuming [%s] for step-over\n", | |
2007 | target_pid_to_str (tp->ptid)); | |
2008 | ||
2009 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2010 | is no longer inserted. In all-stop, we want to keep looking | |
2011 | for a thread that needs a step-over instead of resuming TP, | |
2012 | because we wouldn't be able to resume anything else until the | |
2013 | target stops again. In non-stop, the resume always resumes | |
2014 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2015 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2016 | continue; |
8550d3b3 | 2017 | |
00431a78 | 2018 | switch_to_thread (tp); |
4d9d9d04 PA |
2019 | reset_ecs (ecs, tp); |
2020 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2021 | |
4d9d9d04 PA |
2022 | if (!ecs->wait_some_more) |
2023 | error (_("Command aborted.")); | |
1c5cfe86 | 2024 | |
372316f1 PA |
2025 | gdb_assert (tp->resumed); |
2026 | ||
2027 | /* If we started a new in-line step-over, we're done. */ | |
2028 | if (step_over_info_valid_p ()) | |
2029 | { | |
2030 | gdb_assert (tp->control.trap_expected); | |
2031 | return 1; | |
2032 | } | |
2033 | ||
fbea99ea | 2034 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2035 | { |
2036 | /* On all-stop, shouldn't have resumed unless we needed a | |
2037 | step over. */ | |
2038 | gdb_assert (tp->control.trap_expected | |
2039 | || tp->step_after_step_resume_breakpoint); | |
2040 | ||
2041 | /* With remote targets (at least), in all-stop, we can't | |
2042 | issue any further remote commands until the program stops | |
2043 | again. */ | |
2044 | return 1; | |
1c5cfe86 | 2045 | } |
c2829269 | 2046 | |
4d9d9d04 PA |
2047 | /* Either the thread no longer needed a step-over, or a new |
2048 | displaced stepping sequence started. Even in the latter | |
2049 | case, continue looking. Maybe we can also start another | |
2050 | displaced step on a thread of other process. */ | |
237fc4c9 | 2051 | } |
4d9d9d04 PA |
2052 | |
2053 | return 0; | |
237fc4c9 PA |
2054 | } |
2055 | ||
5231c1fd PA |
2056 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2057 | holding OLD_PTID. */ | |
2058 | static void | |
2059 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2060 | { | |
d7e15655 | 2061 | if (inferior_ptid == old_ptid) |
5231c1fd | 2062 | inferior_ptid = new_ptid; |
5231c1fd PA |
2063 | } |
2064 | ||
237fc4c9 | 2065 | \f |
c906108c | 2066 | |
53904c9e AC |
2067 | static const char schedlock_off[] = "off"; |
2068 | static const char schedlock_on[] = "on"; | |
2069 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2070 | static const char schedlock_replay[] = "replay"; |
40478521 | 2071 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2072 | schedlock_off, |
2073 | schedlock_on, | |
2074 | schedlock_step, | |
f2665db5 | 2075 | schedlock_replay, |
ef346e04 AC |
2076 | NULL |
2077 | }; | |
f2665db5 | 2078 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2079 | static void |
2080 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2081 | struct cmd_list_element *c, const char *value) | |
2082 | { | |
3e43a32a MS |
2083 | fprintf_filtered (file, |
2084 | _("Mode for locking scheduler " | |
2085 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2086 | value); |
2087 | } | |
c906108c SS |
2088 | |
2089 | static void | |
eb4c3f4a | 2090 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2091 | { |
eefe576e AC |
2092 | if (!target_can_lock_scheduler) |
2093 | { | |
2094 | scheduler_mode = schedlock_off; | |
2095 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2096 | } | |
c906108c SS |
2097 | } |
2098 | ||
d4db2f36 PA |
2099 | /* True if execution commands resume all threads of all processes by |
2100 | default; otherwise, resume only threads of the current inferior | |
2101 | process. */ | |
2102 | int sched_multi = 0; | |
2103 | ||
2facfe5c DD |
2104 | /* Try to setup for software single stepping over the specified location. |
2105 | Return 1 if target_resume() should use hardware single step. | |
2106 | ||
2107 | GDBARCH the current gdbarch. | |
2108 | PC the location to step over. */ | |
2109 | ||
2110 | static int | |
2111 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2112 | { | |
2113 | int hw_step = 1; | |
2114 | ||
f02253f1 | 2115 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2116 | && gdbarch_software_single_step_p (gdbarch)) |
2117 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2118 | ||
2facfe5c DD |
2119 | return hw_step; |
2120 | } | |
c906108c | 2121 | |
f3263aa4 PA |
2122 | /* See infrun.h. */ |
2123 | ||
09cee04b PA |
2124 | ptid_t |
2125 | user_visible_resume_ptid (int step) | |
2126 | { | |
f3263aa4 | 2127 | ptid_t resume_ptid; |
09cee04b | 2128 | |
09cee04b PA |
2129 | if (non_stop) |
2130 | { | |
2131 | /* With non-stop mode on, threads are always handled | |
2132 | individually. */ | |
2133 | resume_ptid = inferior_ptid; | |
2134 | } | |
2135 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2136 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2137 | { |
f3263aa4 PA |
2138 | /* User-settable 'scheduler' mode requires solo thread |
2139 | resume. */ | |
09cee04b PA |
2140 | resume_ptid = inferior_ptid; |
2141 | } | |
f2665db5 MM |
2142 | else if ((scheduler_mode == schedlock_replay) |
2143 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2144 | { | |
2145 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2146 | mode. */ | |
2147 | resume_ptid = inferior_ptid; | |
2148 | } | |
f3263aa4 PA |
2149 | else if (!sched_multi && target_supports_multi_process ()) |
2150 | { | |
2151 | /* Resume all threads of the current process (and none of other | |
2152 | processes). */ | |
e99b03dc | 2153 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2154 | } |
2155 | else | |
2156 | { | |
2157 | /* Resume all threads of all processes. */ | |
2158 | resume_ptid = RESUME_ALL; | |
2159 | } | |
09cee04b PA |
2160 | |
2161 | return resume_ptid; | |
2162 | } | |
2163 | ||
fbea99ea PA |
2164 | /* Return a ptid representing the set of threads that we will resume, |
2165 | in the perspective of the target, assuming run control handling | |
2166 | does not require leaving some threads stopped (e.g., stepping past | |
2167 | breakpoint). USER_STEP indicates whether we're about to start the | |
2168 | target for a stepping command. */ | |
2169 | ||
2170 | static ptid_t | |
2171 | internal_resume_ptid (int user_step) | |
2172 | { | |
2173 | /* In non-stop, we always control threads individually. Note that | |
2174 | the target may always work in non-stop mode even with "set | |
2175 | non-stop off", in which case user_visible_resume_ptid could | |
2176 | return a wildcard ptid. */ | |
2177 | if (target_is_non_stop_p ()) | |
2178 | return inferior_ptid; | |
2179 | else | |
2180 | return user_visible_resume_ptid (user_step); | |
2181 | } | |
2182 | ||
64ce06e4 PA |
2183 | /* Wrapper for target_resume, that handles infrun-specific |
2184 | bookkeeping. */ | |
2185 | ||
2186 | static void | |
2187 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2188 | { | |
2189 | struct thread_info *tp = inferior_thread (); | |
2190 | ||
c65d6b55 PA |
2191 | gdb_assert (!tp->stop_requested); |
2192 | ||
64ce06e4 | 2193 | /* Install inferior's terminal modes. */ |
223ffa71 | 2194 | target_terminal::inferior (); |
64ce06e4 PA |
2195 | |
2196 | /* Avoid confusing the next resume, if the next stop/resume | |
2197 | happens to apply to another thread. */ | |
2198 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2199 | ||
8f572e5c PA |
2200 | /* Advise target which signals may be handled silently. |
2201 | ||
2202 | If we have removed breakpoints because we are stepping over one | |
2203 | in-line (in any thread), we need to receive all signals to avoid | |
2204 | accidentally skipping a breakpoint during execution of a signal | |
2205 | handler. | |
2206 | ||
2207 | Likewise if we're displaced stepping, otherwise a trap for a | |
2208 | breakpoint in a signal handler might be confused with the | |
2209 | displaced step finishing. We don't make the displaced_step_fixup | |
2210 | step distinguish the cases instead, because: | |
2211 | ||
2212 | - a backtrace while stopped in the signal handler would show the | |
2213 | scratch pad as frame older than the signal handler, instead of | |
2214 | the real mainline code. | |
2215 | ||
2216 | - when the thread is later resumed, the signal handler would | |
2217 | return to the scratch pad area, which would no longer be | |
2218 | valid. */ | |
2219 | if (step_over_info_valid_p () | |
00431a78 | 2220 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2221 | target_pass_signals ({}); |
64ce06e4 | 2222 | else |
adc6a863 | 2223 | target_pass_signals (signal_pass); |
64ce06e4 PA |
2224 | |
2225 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2226 | |
2227 | target_commit_resume (); | |
64ce06e4 PA |
2228 | } |
2229 | ||
d930703d | 2230 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2231 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2232 | call 'resume', which handles exceptions. */ | |
c906108c | 2233 | |
71d378ae PA |
2234 | static void |
2235 | resume_1 (enum gdb_signal sig) | |
c906108c | 2236 | { |
515630c5 | 2237 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2238 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2239 | struct thread_info *tp = inferior_thread (); |
515630c5 | 2240 | CORE_ADDR pc = regcache_read_pc (regcache); |
8b86c959 | 2241 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2242 | ptid_t resume_ptid; |
856e7dd6 PA |
2243 | /* This represents the user's step vs continue request. When |
2244 | deciding whether "set scheduler-locking step" applies, it's the | |
2245 | user's intention that counts. */ | |
2246 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2247 | /* This represents what we'll actually request the target to do. |
2248 | This can decay from a step to a continue, if e.g., we need to | |
2249 | implement single-stepping with breakpoints (software | |
2250 | single-step). */ | |
6b403daa | 2251 | int step; |
c7e8a53c | 2252 | |
c65d6b55 | 2253 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2254 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2255 | ||
372316f1 PA |
2256 | if (tp->suspend.waitstatus_pending_p) |
2257 | { | |
2258 | if (debug_infrun) | |
2259 | { | |
23fdd69e SM |
2260 | std::string statstr |
2261 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2262 | |
372316f1 | 2263 | fprintf_unfiltered (gdb_stdlog, |
23fdd69e SM |
2264 | "infrun: resume: thread %s has pending wait " |
2265 | "status %s (currently_stepping=%d).\n", | |
2266 | target_pid_to_str (tp->ptid), statstr.c_str (), | |
372316f1 | 2267 | currently_stepping (tp)); |
372316f1 PA |
2268 | } |
2269 | ||
2270 | tp->resumed = 1; | |
2271 | ||
2272 | /* FIXME: What should we do if we are supposed to resume this | |
2273 | thread with a signal? Maybe we should maintain a queue of | |
2274 | pending signals to deliver. */ | |
2275 | if (sig != GDB_SIGNAL_0) | |
2276 | { | |
fd7dcb94 | 2277 | warning (_("Couldn't deliver signal %s to %s."), |
372316f1 PA |
2278 | gdb_signal_to_name (sig), target_pid_to_str (tp->ptid)); |
2279 | } | |
2280 | ||
2281 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2282 | |
2283 | if (target_can_async_p ()) | |
9516f85a AB |
2284 | { |
2285 | target_async (1); | |
2286 | /* Tell the event loop we have an event to process. */ | |
2287 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2288 | } | |
372316f1 PA |
2289 | return; |
2290 | } | |
2291 | ||
2292 | tp->stepped_breakpoint = 0; | |
2293 | ||
6b403daa PA |
2294 | /* Depends on stepped_breakpoint. */ |
2295 | step = currently_stepping (tp); | |
2296 | ||
74609e71 YQ |
2297 | if (current_inferior ()->waiting_for_vfork_done) |
2298 | { | |
48f9886d PA |
2299 | /* Don't try to single-step a vfork parent that is waiting for |
2300 | the child to get out of the shared memory region (by exec'ing | |
2301 | or exiting). This is particularly important on software | |
2302 | single-step archs, as the child process would trip on the | |
2303 | software single step breakpoint inserted for the parent | |
2304 | process. Since the parent will not actually execute any | |
2305 | instruction until the child is out of the shared region (such | |
2306 | are vfork's semantics), it is safe to simply continue it. | |
2307 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2308 | the parent, and tell it to `keep_going', which automatically | |
2309 | re-sets it stepping. */ | |
74609e71 YQ |
2310 | if (debug_infrun) |
2311 | fprintf_unfiltered (gdb_stdlog, | |
2312 | "infrun: resume : clear step\n"); | |
a09dd441 | 2313 | step = 0; |
74609e71 YQ |
2314 | } |
2315 | ||
527159b7 | 2316 | if (debug_infrun) |
237fc4c9 | 2317 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 2318 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 2319 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
2320 | step, gdb_signal_to_symbol_string (sig), |
2321 | tp->control.trap_expected, | |
0d9a9a5f PA |
2322 | target_pid_to_str (inferior_ptid), |
2323 | paddress (gdbarch, pc)); | |
c906108c | 2324 | |
c2c6d25f JM |
2325 | /* Normally, by the time we reach `resume', the breakpoints are either |
2326 | removed or inserted, as appropriate. The exception is if we're sitting | |
2327 | at a permanent breakpoint; we need to step over it, but permanent | |
2328 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2329 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2330 | { |
af48d08f PA |
2331 | if (sig != GDB_SIGNAL_0) |
2332 | { | |
2333 | /* We have a signal to pass to the inferior. The resume | |
2334 | may, or may not take us to the signal handler. If this | |
2335 | is a step, we'll need to stop in the signal handler, if | |
2336 | there's one, (if the target supports stepping into | |
2337 | handlers), or in the next mainline instruction, if | |
2338 | there's no handler. If this is a continue, we need to be | |
2339 | sure to run the handler with all breakpoints inserted. | |
2340 | In all cases, set a breakpoint at the current address | |
2341 | (where the handler returns to), and once that breakpoint | |
2342 | is hit, resume skipping the permanent breakpoint. If | |
2343 | that breakpoint isn't hit, then we've stepped into the | |
2344 | signal handler (or hit some other event). We'll delete | |
2345 | the step-resume breakpoint then. */ | |
2346 | ||
2347 | if (debug_infrun) | |
2348 | fprintf_unfiltered (gdb_stdlog, | |
2349 | "infrun: resume: skipping permanent breakpoint, " | |
2350 | "deliver signal first\n"); | |
2351 | ||
2352 | clear_step_over_info (); | |
2353 | tp->control.trap_expected = 0; | |
2354 | ||
2355 | if (tp->control.step_resume_breakpoint == NULL) | |
2356 | { | |
2357 | /* Set a "high-priority" step-resume, as we don't want | |
2358 | user breakpoints at PC to trigger (again) when this | |
2359 | hits. */ | |
2360 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2361 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2362 | ||
2363 | tp->step_after_step_resume_breakpoint = step; | |
2364 | } | |
2365 | ||
2366 | insert_breakpoints (); | |
2367 | } | |
2368 | else | |
2369 | { | |
2370 | /* There's no signal to pass, we can go ahead and skip the | |
2371 | permanent breakpoint manually. */ | |
2372 | if (debug_infrun) | |
2373 | fprintf_unfiltered (gdb_stdlog, | |
2374 | "infrun: resume: skipping permanent breakpoint\n"); | |
2375 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
2376 | /* Update pc to reflect the new address from which we will | |
2377 | execute instructions. */ | |
2378 | pc = regcache_read_pc (regcache); | |
2379 | ||
2380 | if (step) | |
2381 | { | |
2382 | /* We've already advanced the PC, so the stepping part | |
2383 | is done. Now we need to arrange for a trap to be | |
2384 | reported to handle_inferior_event. Set a breakpoint | |
2385 | at the current PC, and run to it. Don't update | |
2386 | prev_pc, because if we end in | |
44a1ee51 PA |
2387 | switch_back_to_stepped_thread, we want the "expected |
2388 | thread advanced also" branch to be taken. IOW, we | |
2389 | don't want this thread to step further from PC | |
af48d08f | 2390 | (overstep). */ |
1ac806b8 | 2391 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2392 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2393 | insert_breakpoints (); | |
2394 | ||
fbea99ea | 2395 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2396 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
372316f1 | 2397 | tp->resumed = 1; |
af48d08f PA |
2398 | return; |
2399 | } | |
2400 | } | |
6d350bb5 | 2401 | } |
c2c6d25f | 2402 | |
c1e36e3e PA |
2403 | /* If we have a breakpoint to step over, make sure to do a single |
2404 | step only. Same if we have software watchpoints. */ | |
2405 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2406 | tp->control.may_range_step = 0; | |
2407 | ||
237fc4c9 PA |
2408 | /* If enabled, step over breakpoints by executing a copy of the |
2409 | instruction at a different address. | |
2410 | ||
2411 | We can't use displaced stepping when we have a signal to deliver; | |
2412 | the comments for displaced_step_prepare explain why. The | |
2413 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2414 | signals' explain what we do instead. |
2415 | ||
2416 | We can't use displaced stepping when we are waiting for vfork_done | |
2417 | event, displaced stepping breaks the vfork child similarly as single | |
2418 | step software breakpoint. */ | |
3fc8eb30 PA |
2419 | if (tp->control.trap_expected |
2420 | && use_displaced_stepping (tp) | |
cb71640d | 2421 | && !step_over_info_valid_p () |
a493e3e2 | 2422 | && sig == GDB_SIGNAL_0 |
74609e71 | 2423 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2424 | { |
00431a78 | 2425 | int prepared = displaced_step_prepare (tp); |
fc1cf338 | 2426 | |
3fc8eb30 | 2427 | if (prepared == 0) |
d56b7306 | 2428 | { |
4d9d9d04 PA |
2429 | if (debug_infrun) |
2430 | fprintf_unfiltered (gdb_stdlog, | |
2431 | "Got placed in step-over queue\n"); | |
2432 | ||
2433 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2434 | return; |
2435 | } | |
3fc8eb30 PA |
2436 | else if (prepared < 0) |
2437 | { | |
2438 | /* Fallback to stepping over the breakpoint in-line. */ | |
2439 | ||
2440 | if (target_is_non_stop_p ()) | |
2441 | stop_all_threads (); | |
2442 | ||
a01bda52 | 2443 | set_step_over_info (regcache->aspace (), |
21edc42f | 2444 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2445 | |
2446 | step = maybe_software_singlestep (gdbarch, pc); | |
2447 | ||
2448 | insert_breakpoints (); | |
2449 | } | |
2450 | else if (prepared > 0) | |
2451 | { | |
2452 | struct displaced_step_inferior_state *displaced; | |
99e40580 | 2453 | |
3fc8eb30 PA |
2454 | /* Update pc to reflect the new address from which we will |
2455 | execute instructions due to displaced stepping. */ | |
00431a78 | 2456 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2457 | |
00431a78 | 2458 | displaced = get_displaced_stepping_state (tp->inf); |
3fc8eb30 PA |
2459 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, |
2460 | displaced->step_closure); | |
2461 | } | |
237fc4c9 PA |
2462 | } |
2463 | ||
2facfe5c | 2464 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2465 | else if (step) |
2facfe5c | 2466 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2467 | |
30852783 UW |
2468 | /* Currently, our software single-step implementation leads to different |
2469 | results than hardware single-stepping in one situation: when stepping | |
2470 | into delivering a signal which has an associated signal handler, | |
2471 | hardware single-step will stop at the first instruction of the handler, | |
2472 | while software single-step will simply skip execution of the handler. | |
2473 | ||
2474 | For now, this difference in behavior is accepted since there is no | |
2475 | easy way to actually implement single-stepping into a signal handler | |
2476 | without kernel support. | |
2477 | ||
2478 | However, there is one scenario where this difference leads to follow-on | |
2479 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2480 | and then single-stepping. In this case, the software single-step | |
2481 | behavior means that even if there is a *breakpoint* in the signal | |
2482 | handler, GDB still would not stop. | |
2483 | ||
2484 | Fortunately, we can at least fix this particular issue. We detect | |
2485 | here the case where we are about to deliver a signal while software | |
2486 | single-stepping with breakpoints removed. In this situation, we | |
2487 | revert the decisions to remove all breakpoints and insert single- | |
2488 | step breakpoints, and instead we install a step-resume breakpoint | |
2489 | at the current address, deliver the signal without stepping, and | |
2490 | once we arrive back at the step-resume breakpoint, actually step | |
2491 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2492 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2493 | && sig != GDB_SIGNAL_0 |
2494 | && step_over_info_valid_p ()) | |
30852783 UW |
2495 | { |
2496 | /* If we have nested signals or a pending signal is delivered | |
2497 | immediately after a handler returns, might might already have | |
2498 | a step-resume breakpoint set on the earlier handler. We cannot | |
2499 | set another step-resume breakpoint; just continue on until the | |
2500 | original breakpoint is hit. */ | |
2501 | if (tp->control.step_resume_breakpoint == NULL) | |
2502 | { | |
2c03e5be | 2503 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2504 | tp->step_after_step_resume_breakpoint = 1; |
2505 | } | |
2506 | ||
34b7e8a6 | 2507 | delete_single_step_breakpoints (tp); |
30852783 | 2508 | |
31e77af2 | 2509 | clear_step_over_info (); |
30852783 | 2510 | tp->control.trap_expected = 0; |
31e77af2 PA |
2511 | |
2512 | insert_breakpoints (); | |
30852783 UW |
2513 | } |
2514 | ||
b0f16a3e SM |
2515 | /* If STEP is set, it's a request to use hardware stepping |
2516 | facilities. But in that case, we should never | |
2517 | use singlestep breakpoint. */ | |
34b7e8a6 | 2518 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2519 | |
fbea99ea | 2520 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2521 | if (tp->control.trap_expected) |
b0f16a3e SM |
2522 | { |
2523 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2524 | hit, either by single-stepping the thread with the breakpoint |
2525 | removed, or by displaced stepping, with the breakpoint inserted. | |
2526 | In the former case, we need to single-step only this thread, | |
2527 | and keep others stopped, as they can miss this breakpoint if | |
2528 | allowed to run. That's not really a problem for displaced | |
2529 | stepping, but, we still keep other threads stopped, in case | |
2530 | another thread is also stopped for a breakpoint waiting for | |
2531 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2532 | resume_ptid = inferior_ptid; |
2533 | } | |
fbea99ea PA |
2534 | else |
2535 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2536 | |
7f5ef605 PA |
2537 | if (execution_direction != EXEC_REVERSE |
2538 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2539 | { |
372316f1 PA |
2540 | /* There are two cases where we currently need to step a |
2541 | breakpoint instruction when we have a signal to deliver: | |
2542 | ||
2543 | - See handle_signal_stop where we handle random signals that | |
2544 | could take out us out of the stepping range. Normally, in | |
2545 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2546 | signal handler with a breakpoint at PC, but there are cases |
2547 | where we should _always_ single-step, even if we have a | |
2548 | step-resume breakpoint, like when a software watchpoint is | |
2549 | set. Assuming single-stepping and delivering a signal at the | |
2550 | same time would takes us to the signal handler, then we could | |
2551 | have removed the breakpoint at PC to step over it. However, | |
2552 | some hardware step targets (like e.g., Mac OS) can't step | |
2553 | into signal handlers, and for those, we need to leave the | |
2554 | breakpoint at PC inserted, as otherwise if the handler | |
2555 | recurses and executes PC again, it'll miss the breakpoint. | |
2556 | So we leave the breakpoint inserted anyway, but we need to | |
2557 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2558 | that adjust_pc_after_break doesn't end up confused. |
2559 | ||
2560 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2561 | in one thread after another thread that was stepping had been | |
2562 | momentarily paused for a step-over. When we re-resume the | |
2563 | stepping thread, it may be resumed from that address with a | |
2564 | breakpoint that hasn't trapped yet. Seen with | |
2565 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2566 | do displaced stepping. */ | |
2567 | ||
2568 | if (debug_infrun) | |
2569 | fprintf_unfiltered (gdb_stdlog, | |
2570 | "infrun: resume: [%s] stepped breakpoint\n", | |
2571 | target_pid_to_str (tp->ptid)); | |
7f5ef605 PA |
2572 | |
2573 | tp->stepped_breakpoint = 1; | |
2574 | ||
b0f16a3e SM |
2575 | /* Most targets can step a breakpoint instruction, thus |
2576 | executing it normally. But if this one cannot, just | |
2577 | continue and we will hit it anyway. */ | |
7f5ef605 | 2578 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2579 | step = 0; |
2580 | } | |
ef5cf84e | 2581 | |
b0f16a3e | 2582 | if (debug_displaced |
cb71640d | 2583 | && tp->control.trap_expected |
3fc8eb30 | 2584 | && use_displaced_stepping (tp) |
cb71640d | 2585 | && !step_over_info_valid_p ()) |
b0f16a3e | 2586 | { |
00431a78 | 2587 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2588 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2589 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2590 | gdb_byte buf[4]; | |
2591 | ||
2592 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2593 | paddress (resume_gdbarch, actual_pc)); | |
2594 | read_memory (actual_pc, buf, sizeof (buf)); | |
2595 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2596 | } | |
237fc4c9 | 2597 | |
b0f16a3e SM |
2598 | if (tp->control.may_range_step) |
2599 | { | |
2600 | /* If we're resuming a thread with the PC out of the step | |
2601 | range, then we're doing some nested/finer run control | |
2602 | operation, like stepping the thread out of the dynamic | |
2603 | linker or the displaced stepping scratch pad. We | |
2604 | shouldn't have allowed a range step then. */ | |
2605 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2606 | } | |
c1e36e3e | 2607 | |
64ce06e4 | 2608 | do_target_resume (resume_ptid, step, sig); |
372316f1 | 2609 | tp->resumed = 1; |
c906108c | 2610 | } |
71d378ae PA |
2611 | |
2612 | /* Resume the inferior. SIG is the signal to give the inferior | |
2613 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2614 | rolls back state on error. */ | |
2615 | ||
aff4e175 | 2616 | static void |
71d378ae PA |
2617 | resume (gdb_signal sig) |
2618 | { | |
2619 | TRY | |
2620 | { | |
2621 | resume_1 (sig); | |
2622 | } | |
2623 | CATCH (ex, RETURN_MASK_ALL) | |
2624 | { | |
2625 | /* If resuming is being aborted for any reason, delete any | |
2626 | single-step breakpoint resume_1 may have created, to avoid | |
2627 | confusing the following resumption, and to avoid leaving | |
2628 | single-step breakpoints perturbing other threads, in case | |
2629 | we're running in non-stop mode. */ | |
2630 | if (inferior_ptid != null_ptid) | |
2631 | delete_single_step_breakpoints (inferior_thread ()); | |
2632 | throw_exception (ex); | |
2633 | } | |
2634 | END_CATCH | |
2635 | } | |
2636 | ||
c906108c | 2637 | \f |
237fc4c9 | 2638 | /* Proceeding. */ |
c906108c | 2639 | |
4c2f2a79 PA |
2640 | /* See infrun.h. */ |
2641 | ||
2642 | /* Counter that tracks number of user visible stops. This can be used | |
2643 | to tell whether a command has proceeded the inferior past the | |
2644 | current location. This allows e.g., inferior function calls in | |
2645 | breakpoint commands to not interrupt the command list. When the | |
2646 | call finishes successfully, the inferior is standing at the same | |
2647 | breakpoint as if nothing happened (and so we don't call | |
2648 | normal_stop). */ | |
2649 | static ULONGEST current_stop_id; | |
2650 | ||
2651 | /* See infrun.h. */ | |
2652 | ||
2653 | ULONGEST | |
2654 | get_stop_id (void) | |
2655 | { | |
2656 | return current_stop_id; | |
2657 | } | |
2658 | ||
2659 | /* Called when we report a user visible stop. */ | |
2660 | ||
2661 | static void | |
2662 | new_stop_id (void) | |
2663 | { | |
2664 | current_stop_id++; | |
2665 | } | |
2666 | ||
c906108c SS |
2667 | /* Clear out all variables saying what to do when inferior is continued. |
2668 | First do this, then set the ones you want, then call `proceed'. */ | |
2669 | ||
a7212384 UW |
2670 | static void |
2671 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2672 | { |
a7212384 UW |
2673 | if (debug_infrun) |
2674 | fprintf_unfiltered (gdb_stdlog, | |
2675 | "infrun: clear_proceed_status_thread (%s)\n", | |
2676 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 2677 | |
372316f1 PA |
2678 | /* If we're starting a new sequence, then the previous finished |
2679 | single-step is no longer relevant. */ | |
2680 | if (tp->suspend.waitstatus_pending_p) | |
2681 | { | |
2682 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2683 | { | |
2684 | if (debug_infrun) | |
2685 | fprintf_unfiltered (gdb_stdlog, | |
2686 | "infrun: clear_proceed_status: pending " | |
2687 | "event of %s was a finished step. " | |
2688 | "Discarding.\n", | |
2689 | target_pid_to_str (tp->ptid)); | |
2690 | ||
2691 | tp->suspend.waitstatus_pending_p = 0; | |
2692 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2693 | } | |
2694 | else if (debug_infrun) | |
2695 | { | |
23fdd69e SM |
2696 | std::string statstr |
2697 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2698 | |
372316f1 PA |
2699 | fprintf_unfiltered (gdb_stdlog, |
2700 | "infrun: clear_proceed_status_thread: thread %s " | |
2701 | "has pending wait status %s " | |
2702 | "(currently_stepping=%d).\n", | |
23fdd69e | 2703 | target_pid_to_str (tp->ptid), statstr.c_str (), |
372316f1 | 2704 | currently_stepping (tp)); |
372316f1 PA |
2705 | } |
2706 | } | |
2707 | ||
70509625 PA |
2708 | /* If this signal should not be seen by program, give it zero. |
2709 | Used for debugging signals. */ | |
2710 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2711 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2712 | ||
46e3ed7f | 2713 | delete tp->thread_fsm; |
243a9253 PA |
2714 | tp->thread_fsm = NULL; |
2715 | ||
16c381f0 JK |
2716 | tp->control.trap_expected = 0; |
2717 | tp->control.step_range_start = 0; | |
2718 | tp->control.step_range_end = 0; | |
c1e36e3e | 2719 | tp->control.may_range_step = 0; |
16c381f0 JK |
2720 | tp->control.step_frame_id = null_frame_id; |
2721 | tp->control.step_stack_frame_id = null_frame_id; | |
2722 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2723 | tp->control.step_start_function = NULL; |
a7212384 | 2724 | tp->stop_requested = 0; |
4e1c45ea | 2725 | |
16c381f0 | 2726 | tp->control.stop_step = 0; |
32400beb | 2727 | |
16c381f0 | 2728 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2729 | |
856e7dd6 | 2730 | tp->control.stepping_command = 0; |
17b2616c | 2731 | |
a7212384 | 2732 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2733 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2734 | } |
32400beb | 2735 | |
a7212384 | 2736 | void |
70509625 | 2737 | clear_proceed_status (int step) |
a7212384 | 2738 | { |
f2665db5 MM |
2739 | /* With scheduler-locking replay, stop replaying other threads if we're |
2740 | not replaying the user-visible resume ptid. | |
2741 | ||
2742 | This is a convenience feature to not require the user to explicitly | |
2743 | stop replaying the other threads. We're assuming that the user's | |
2744 | intent is to resume tracing the recorded process. */ | |
2745 | if (!non_stop && scheduler_mode == schedlock_replay | |
2746 | && target_record_is_replaying (minus_one_ptid) | |
2747 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2748 | execution_direction)) | |
2749 | target_record_stop_replaying (); | |
2750 | ||
08036331 | 2751 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2752 | { |
08036331 | 2753 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
70509625 PA |
2754 | |
2755 | /* In all-stop mode, delete the per-thread status of all threads | |
2756 | we're about to resume, implicitly and explicitly. */ | |
08036331 PA |
2757 | for (thread_info *tp : all_non_exited_threads (resume_ptid)) |
2758 | clear_proceed_status_thread (tp); | |
6c95b8df PA |
2759 | } |
2760 | ||
d7e15655 | 2761 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2762 | { |
2763 | struct inferior *inferior; | |
2764 | ||
2765 | if (non_stop) | |
2766 | { | |
6c95b8df PA |
2767 | /* If in non-stop mode, only delete the per-thread status of |
2768 | the current thread. */ | |
a7212384 UW |
2769 | clear_proceed_status_thread (inferior_thread ()); |
2770 | } | |
6c95b8df | 2771 | |
d6b48e9c | 2772 | inferior = current_inferior (); |
16c381f0 | 2773 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2774 | } |
2775 | ||
76727919 | 2776 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2777 | } |
2778 | ||
99619bea PA |
2779 | /* Returns true if TP is still stopped at a breakpoint that needs |
2780 | stepping-over in order to make progress. If the breakpoint is gone | |
2781 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2782 | |
2783 | static int | |
6c4cfb24 | 2784 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2785 | { |
2786 | if (tp->stepping_over_breakpoint) | |
2787 | { | |
00431a78 | 2788 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2789 | |
a01bda52 | 2790 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2791 | regcache_read_pc (regcache)) |
2792 | == ordinary_breakpoint_here) | |
99619bea PA |
2793 | return 1; |
2794 | ||
2795 | tp->stepping_over_breakpoint = 0; | |
2796 | } | |
2797 | ||
2798 | return 0; | |
2799 | } | |
2800 | ||
6c4cfb24 PA |
2801 | /* Check whether thread TP still needs to start a step-over in order |
2802 | to make progress when resumed. Returns an bitwise or of enum | |
2803 | step_over_what bits, indicating what needs to be stepped over. */ | |
2804 | ||
8d297bbf | 2805 | static step_over_what |
6c4cfb24 PA |
2806 | thread_still_needs_step_over (struct thread_info *tp) |
2807 | { | |
8d297bbf | 2808 | step_over_what what = 0; |
6c4cfb24 PA |
2809 | |
2810 | if (thread_still_needs_step_over_bp (tp)) | |
2811 | what |= STEP_OVER_BREAKPOINT; | |
2812 | ||
2813 | if (tp->stepping_over_watchpoint | |
2814 | && !target_have_steppable_watchpoint) | |
2815 | what |= STEP_OVER_WATCHPOINT; | |
2816 | ||
2817 | return what; | |
2818 | } | |
2819 | ||
483805cf PA |
2820 | /* Returns true if scheduler locking applies. STEP indicates whether |
2821 | we're about to do a step/next-like command to a thread. */ | |
2822 | ||
2823 | static int | |
856e7dd6 | 2824 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2825 | { |
2826 | return (scheduler_mode == schedlock_on | |
2827 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2828 | && tp->control.stepping_command) |
2829 | || (scheduler_mode == schedlock_replay | |
2830 | && target_record_will_replay (minus_one_ptid, | |
2831 | execution_direction))); | |
483805cf PA |
2832 | } |
2833 | ||
c906108c SS |
2834 | /* Basic routine for continuing the program in various fashions. |
2835 | ||
2836 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
2837 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
2838 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
2839 | |
2840 | You should call clear_proceed_status before calling proceed. */ | |
2841 | ||
2842 | void | |
64ce06e4 | 2843 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2844 | { |
e58b0e63 PA |
2845 | struct regcache *regcache; |
2846 | struct gdbarch *gdbarch; | |
e58b0e63 | 2847 | CORE_ADDR pc; |
4d9d9d04 PA |
2848 | ptid_t resume_ptid; |
2849 | struct execution_control_state ecss; | |
2850 | struct execution_control_state *ecs = &ecss; | |
4d9d9d04 | 2851 | int started; |
c906108c | 2852 | |
e58b0e63 PA |
2853 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2854 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2855 | resuming the current thread. */ | |
2856 | if (!follow_fork ()) | |
2857 | { | |
2858 | /* The target for some reason decided not to resume. */ | |
2859 | normal_stop (); | |
f148b27e PA |
2860 | if (target_can_async_p ()) |
2861 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2862 | return; |
2863 | } | |
2864 | ||
842951eb PA |
2865 | /* We'll update this if & when we switch to a new thread. */ |
2866 | previous_inferior_ptid = inferior_ptid; | |
2867 | ||
e58b0e63 | 2868 | regcache = get_current_regcache (); |
ac7936df | 2869 | gdbarch = regcache->arch (); |
8b86c959 YQ |
2870 | const address_space *aspace = regcache->aspace (); |
2871 | ||
e58b0e63 | 2872 | pc = regcache_read_pc (regcache); |
08036331 | 2873 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 2874 | |
99619bea | 2875 | /* Fill in with reasonable starting values. */ |
08036331 | 2876 | init_thread_stepping_state (cur_thr); |
99619bea | 2877 | |
08036331 | 2878 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 2879 | |
2acceee2 | 2880 | if (addr == (CORE_ADDR) -1) |
c906108c | 2881 | { |
08036331 | 2882 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 2883 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 2884 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2885 | /* There is a breakpoint at the address we will resume at, |
2886 | step one instruction before inserting breakpoints so that | |
2887 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2888 | breakpoint). |
2889 | ||
2890 | Note, we don't do this in reverse, because we won't | |
2891 | actually be executing the breakpoint insn anyway. | |
2892 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 2893 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
2894 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2895 | && gdbarch_single_step_through_delay (gdbarch, | |
2896 | get_current_frame ())) | |
3352ef37 AC |
2897 | /* We stepped onto an instruction that needs to be stepped |
2898 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 2899 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
2900 | } |
2901 | else | |
2902 | { | |
515630c5 | 2903 | regcache_write_pc (regcache, addr); |
c906108c SS |
2904 | } |
2905 | ||
70509625 | 2906 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 2907 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 2908 | |
08036331 | 2909 | resume_ptid = user_visible_resume_ptid (cur_thr->control.stepping_command); |
4d9d9d04 PA |
2910 | |
2911 | /* If an exception is thrown from this point on, make sure to | |
2912 | propagate GDB's knowledge of the executing state to the | |
2913 | frontend/user running state. */ | |
731f534f | 2914 | scoped_finish_thread_state finish_state (resume_ptid); |
4d9d9d04 PA |
2915 | |
2916 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
2917 | threads (e.g., we might need to set threads stepping over | |
2918 | breakpoints first), from the user/frontend's point of view, all | |
2919 | threads in RESUME_PTID are now running. Unless we're calling an | |
2920 | inferior function, as in that case we pretend the inferior | |
2921 | doesn't run at all. */ | |
08036331 | 2922 | if (!cur_thr->control.in_infcall) |
4d9d9d04 | 2923 | set_running (resume_ptid, 1); |
17b2616c | 2924 | |
527159b7 | 2925 | if (debug_infrun) |
8a9de0e4 | 2926 | fprintf_unfiltered (gdb_stdlog, |
64ce06e4 | 2927 | "infrun: proceed (addr=%s, signal=%s)\n", |
c9737c08 | 2928 | paddress (gdbarch, addr), |
64ce06e4 | 2929 | gdb_signal_to_symbol_string (siggnal)); |
527159b7 | 2930 | |
4d9d9d04 PA |
2931 | annotate_starting (); |
2932 | ||
2933 | /* Make sure that output from GDB appears before output from the | |
2934 | inferior. */ | |
2935 | gdb_flush (gdb_stdout); | |
2936 | ||
d930703d PA |
2937 | /* Since we've marked the inferior running, give it the terminal. A |
2938 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
2939 | still detect attempts to unblock a stuck connection with repeated | |
2940 | Ctrl-C from within target_pass_ctrlc). */ | |
2941 | target_terminal::inferior (); | |
2942 | ||
4d9d9d04 PA |
2943 | /* In a multi-threaded task we may select another thread and |
2944 | then continue or step. | |
2945 | ||
2946 | But if a thread that we're resuming had stopped at a breakpoint, | |
2947 | it will immediately cause another breakpoint stop without any | |
2948 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
2949 | we must step over it first. | |
2950 | ||
2951 | Look for threads other than the current (TP) that reported a | |
2952 | breakpoint hit and haven't been resumed yet since. */ | |
2953 | ||
2954 | /* If scheduler locking applies, we can avoid iterating over all | |
2955 | threads. */ | |
08036331 | 2956 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 2957 | { |
08036331 PA |
2958 | for (thread_info *tp : all_non_exited_threads (resume_ptid)) |
2959 | { | |
4d9d9d04 PA |
2960 | /* Ignore the current thread here. It's handled |
2961 | afterwards. */ | |
08036331 | 2962 | if (tp == cur_thr) |
4d9d9d04 | 2963 | continue; |
c906108c | 2964 | |
4d9d9d04 PA |
2965 | if (!thread_still_needs_step_over (tp)) |
2966 | continue; | |
2967 | ||
2968 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 2969 | |
99619bea PA |
2970 | if (debug_infrun) |
2971 | fprintf_unfiltered (gdb_stdlog, | |
2972 | "infrun: need to step-over [%s] first\n", | |
4d9d9d04 | 2973 | target_pid_to_str (tp->ptid)); |
99619bea | 2974 | |
4d9d9d04 | 2975 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 2976 | } |
30852783 UW |
2977 | } |
2978 | ||
4d9d9d04 PA |
2979 | /* Enqueue the current thread last, so that we move all other |
2980 | threads over their breakpoints first. */ | |
08036331 PA |
2981 | if (cur_thr->stepping_over_breakpoint) |
2982 | thread_step_over_chain_enqueue (cur_thr); | |
30852783 | 2983 | |
4d9d9d04 PA |
2984 | /* If the thread isn't started, we'll still need to set its prev_pc, |
2985 | so that switch_back_to_stepped_thread knows the thread hasn't | |
2986 | advanced. Must do this before resuming any thread, as in | |
2987 | all-stop/remote, once we resume we can't send any other packet | |
2988 | until the target stops again. */ | |
08036331 | 2989 | cur_thr->prev_pc = regcache_read_pc (regcache); |
99619bea | 2990 | |
a9bc57b9 TT |
2991 | { |
2992 | scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume (); | |
85ad3aaf | 2993 | |
a9bc57b9 | 2994 | started = start_step_over (); |
c906108c | 2995 | |
a9bc57b9 TT |
2996 | if (step_over_info_valid_p ()) |
2997 | { | |
2998 | /* Either this thread started a new in-line step over, or some | |
2999 | other thread was already doing one. In either case, don't | |
3000 | resume anything else until the step-over is finished. */ | |
3001 | } | |
3002 | else if (started && !target_is_non_stop_p ()) | |
3003 | { | |
3004 | /* A new displaced stepping sequence was started. In all-stop, | |
3005 | we can't talk to the target anymore until it next stops. */ | |
3006 | } | |
3007 | else if (!non_stop && target_is_non_stop_p ()) | |
3008 | { | |
3009 | /* In all-stop, but the target is always in non-stop mode. | |
3010 | Start all other threads that are implicitly resumed too. */ | |
08036331 | 3011 | for (thread_info *tp : all_non_exited_threads (resume_ptid)) |
fbea99ea | 3012 | { |
fbea99ea PA |
3013 | if (tp->resumed) |
3014 | { | |
3015 | if (debug_infrun) | |
3016 | fprintf_unfiltered (gdb_stdlog, | |
3017 | "infrun: proceed: [%s] resumed\n", | |
3018 | target_pid_to_str (tp->ptid)); | |
3019 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
3020 | continue; | |
3021 | } | |
3022 | ||
3023 | if (thread_is_in_step_over_chain (tp)) | |
3024 | { | |
3025 | if (debug_infrun) | |
3026 | fprintf_unfiltered (gdb_stdlog, | |
3027 | "infrun: proceed: [%s] needs step-over\n", | |
3028 | target_pid_to_str (tp->ptid)); | |
3029 | continue; | |
3030 | } | |
3031 | ||
3032 | if (debug_infrun) | |
3033 | fprintf_unfiltered (gdb_stdlog, | |
3034 | "infrun: proceed: resuming %s\n", | |
3035 | target_pid_to_str (tp->ptid)); | |
3036 | ||
3037 | reset_ecs (ecs, tp); | |
00431a78 | 3038 | switch_to_thread (tp); |
fbea99ea PA |
3039 | keep_going_pass_signal (ecs); |
3040 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3041 | error (_("Command aborted.")); |
fbea99ea | 3042 | } |
a9bc57b9 | 3043 | } |
08036331 | 3044 | else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3045 | { |
3046 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3047 | reset_ecs (ecs, cur_thr); |
3048 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3049 | keep_going_pass_signal (ecs); |
3050 | if (!ecs->wait_some_more) | |
3051 | error (_("Command aborted.")); | |
3052 | } | |
3053 | } | |
c906108c | 3054 | |
85ad3aaf PA |
3055 | target_commit_resume (); |
3056 | ||
731f534f | 3057 | finish_state.release (); |
c906108c | 3058 | |
0b333c5e PA |
3059 | /* Tell the event loop to wait for it to stop. If the target |
3060 | supports asynchronous execution, it'll do this from within | |
3061 | target_resume. */ | |
362646f5 | 3062 | if (!target_can_async_p ()) |
0b333c5e | 3063 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3064 | } |
c906108c SS |
3065 | \f |
3066 | ||
3067 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3068 | |
c906108c | 3069 | void |
8621d6a9 | 3070 | start_remote (int from_tty) |
c906108c | 3071 | { |
d6b48e9c | 3072 | struct inferior *inferior; |
d6b48e9c PA |
3073 | |
3074 | inferior = current_inferior (); | |
16c381f0 | 3075 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; |
43ff13b4 | 3076 | |
1777feb0 | 3077 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3078 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3079 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3080 | nothing is returned (instead of just blocking). Because of this, |
3081 | targets expecting an immediate response need to, internally, set | |
3082 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3083 | timeout. */ |
6426a772 JM |
3084 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3085 | differentiate to its caller what the state of the target is after | |
3086 | the initial open has been performed. Here we're assuming that | |
3087 | the target has stopped. It should be possible to eventually have | |
3088 | target_open() return to the caller an indication that the target | |
3089 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3090 | for an async run. */ |
e4c8541f | 3091 | wait_for_inferior (); |
8621d6a9 DJ |
3092 | |
3093 | /* Now that the inferior has stopped, do any bookkeeping like | |
3094 | loading shared libraries. We want to do this before normal_stop, | |
3095 | so that the displayed frame is up to date. */ | |
8b88a78e | 3096 | post_create_inferior (current_top_target (), from_tty); |
8621d6a9 | 3097 | |
6426a772 | 3098 | normal_stop (); |
c906108c SS |
3099 | } |
3100 | ||
3101 | /* Initialize static vars when a new inferior begins. */ | |
3102 | ||
3103 | void | |
96baa820 | 3104 | init_wait_for_inferior (void) |
c906108c SS |
3105 | { |
3106 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3107 | |
c906108c SS |
3108 | breakpoint_init_inferior (inf_starting); |
3109 | ||
70509625 | 3110 | clear_proceed_status (0); |
9f976b41 | 3111 | |
ca005067 | 3112 | target_last_wait_ptid = minus_one_ptid; |
237fc4c9 | 3113 | |
842951eb | 3114 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3115 | } |
237fc4c9 | 3116 | |
c906108c | 3117 | \f |
488f131b | 3118 | |
ec9499be | 3119 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3120 | |
568d6575 UW |
3121 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3122 | struct execution_control_state *ecs); | |
3123 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3124 | struct execution_control_state *ecs); | |
4f5d7f63 | 3125 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3126 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3127 | struct frame_info *); |
611c83ae | 3128 | |
bdc36728 | 3129 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3130 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3131 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3132 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3133 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3134 | |
252fbfc8 PA |
3135 | /* This function is attached as a "thread_stop_requested" observer. |
3136 | Cleanup local state that assumed the PTID was to be resumed, and | |
3137 | report the stop to the frontend. */ | |
3138 | ||
2c0b251b | 3139 | static void |
252fbfc8 PA |
3140 | infrun_thread_stop_requested (ptid_t ptid) |
3141 | { | |
c65d6b55 PA |
3142 | /* PTID was requested to stop. If the thread was already stopped, |
3143 | but the user/frontend doesn't know about that yet (e.g., the | |
3144 | thread had been temporarily paused for some step-over), set up | |
3145 | for reporting the stop now. */ | |
08036331 PA |
3146 | for (thread_info *tp : all_threads (ptid)) |
3147 | { | |
3148 | if (tp->state != THREAD_RUNNING) | |
3149 | continue; | |
3150 | if (tp->executing) | |
3151 | continue; | |
c65d6b55 | 3152 | |
08036331 PA |
3153 | /* Remove matching threads from the step-over queue, so |
3154 | start_step_over doesn't try to resume them | |
3155 | automatically. */ | |
3156 | if (thread_is_in_step_over_chain (tp)) | |
3157 | thread_step_over_chain_remove (tp); | |
c65d6b55 | 3158 | |
08036331 PA |
3159 | /* If the thread is stopped, but the user/frontend doesn't |
3160 | know about that yet, queue a pending event, as if the | |
3161 | thread had just stopped now. Unless the thread already had | |
3162 | a pending event. */ | |
3163 | if (!tp->suspend.waitstatus_pending_p) | |
3164 | { | |
3165 | tp->suspend.waitstatus_pending_p = 1; | |
3166 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3167 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3168 | } | |
c65d6b55 | 3169 | |
08036331 PA |
3170 | /* Clear the inline-frame state, since we're re-processing the |
3171 | stop. */ | |
3172 | clear_inline_frame_state (tp->ptid); | |
c65d6b55 | 3173 | |
08036331 PA |
3174 | /* If this thread was paused because some other thread was |
3175 | doing an inline-step over, let that finish first. Once | |
3176 | that happens, we'll restart all threads and consume pending | |
3177 | stop events then. */ | |
3178 | if (step_over_info_valid_p ()) | |
3179 | continue; | |
3180 | ||
3181 | /* Otherwise we can process the (new) pending event now. Set | |
3182 | it so this pending event is considered by | |
3183 | do_target_wait. */ | |
3184 | tp->resumed = 1; | |
3185 | } | |
252fbfc8 PA |
3186 | } |
3187 | ||
a07daef3 PA |
3188 | static void |
3189 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3190 | { | |
d7e15655 | 3191 | if (target_last_wait_ptid == tp->ptid) |
a07daef3 PA |
3192 | nullify_last_target_wait_ptid (); |
3193 | } | |
3194 | ||
0cbcdb96 PA |
3195 | /* Delete the step resume, single-step and longjmp/exception resume |
3196 | breakpoints of TP. */ | |
4e1c45ea | 3197 | |
0cbcdb96 PA |
3198 | static void |
3199 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3200 | { |
0cbcdb96 PA |
3201 | delete_step_resume_breakpoint (tp); |
3202 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3203 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3204 | } |
3205 | ||
0cbcdb96 PA |
3206 | /* If the target still has execution, call FUNC for each thread that |
3207 | just stopped. In all-stop, that's all the non-exited threads; in | |
3208 | non-stop, that's the current thread, only. */ | |
3209 | ||
3210 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3211 | (struct thread_info *tp); | |
4e1c45ea PA |
3212 | |
3213 | static void | |
0cbcdb96 | 3214 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3215 | { |
d7e15655 | 3216 | if (!target_has_execution || inferior_ptid == null_ptid) |
4e1c45ea PA |
3217 | return; |
3218 | ||
fbea99ea | 3219 | if (target_is_non_stop_p ()) |
4e1c45ea | 3220 | { |
0cbcdb96 PA |
3221 | /* If in non-stop mode, only the current thread stopped. */ |
3222 | func (inferior_thread ()); | |
4e1c45ea PA |
3223 | } |
3224 | else | |
0cbcdb96 | 3225 | { |
0cbcdb96 | 3226 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3227 | for (thread_info *tp : all_non_exited_threads ()) |
3228 | func (tp); | |
0cbcdb96 PA |
3229 | } |
3230 | } | |
3231 | ||
3232 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3233 | the threads that just stopped. */ | |
3234 | ||
3235 | static void | |
3236 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3237 | { | |
3238 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3239 | } |
3240 | ||
3241 | /* Delete the single-step breakpoints of the threads that just | |
3242 | stopped. */ | |
7c16b83e | 3243 | |
34b7e8a6 PA |
3244 | static void |
3245 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3246 | { | |
3247 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3248 | } |
3249 | ||
221e1a37 | 3250 | /* See infrun.h. */ |
223698f8 | 3251 | |
221e1a37 | 3252 | void |
223698f8 DE |
3253 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3254 | const struct target_waitstatus *ws) | |
3255 | { | |
23fdd69e | 3256 | std::string status_string = target_waitstatus_to_string (ws); |
d7e74731 | 3257 | string_file stb; |
223698f8 DE |
3258 | |
3259 | /* The text is split over several lines because it was getting too long. | |
3260 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3261 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3262 | is set. */ | |
3263 | ||
d7e74731 | 3264 | stb.printf ("infrun: target_wait (%d.%ld.%ld", |
e99b03dc | 3265 | waiton_ptid.pid (), |
e38504b3 | 3266 | waiton_ptid.lwp (), |
cc6bcb54 | 3267 | waiton_ptid.tid ()); |
e99b03dc | 3268 | if (waiton_ptid.pid () != -1) |
d7e74731 PA |
3269 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid)); |
3270 | stb.printf (", status) =\n"); | |
3271 | stb.printf ("infrun: %d.%ld.%ld [%s],\n", | |
e99b03dc | 3272 | result_ptid.pid (), |
e38504b3 | 3273 | result_ptid.lwp (), |
cc6bcb54 | 3274 | result_ptid.tid (), |
d7e74731 | 3275 | target_pid_to_str (result_ptid)); |
23fdd69e | 3276 | stb.printf ("infrun: %s\n", status_string.c_str ()); |
223698f8 DE |
3277 | |
3278 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3279 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3280 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3281 | } |
3282 | ||
372316f1 PA |
3283 | /* Select a thread at random, out of those which are resumed and have |
3284 | had events. */ | |
3285 | ||
3286 | static struct thread_info * | |
3287 | random_pending_event_thread (ptid_t waiton_ptid) | |
3288 | { | |
372316f1 | 3289 | int num_events = 0; |
08036331 PA |
3290 | |
3291 | auto has_event = [] (thread_info *tp) | |
3292 | { | |
3293 | return (tp->resumed | |
3294 | && tp->suspend.waitstatus_pending_p); | |
3295 | }; | |
372316f1 PA |
3296 | |
3297 | /* First see how many events we have. Count only resumed threads | |
3298 | that have an event pending. */ | |
08036331 PA |
3299 | for (thread_info *tp : all_non_exited_threads (waiton_ptid)) |
3300 | if (has_event (tp)) | |
372316f1 PA |
3301 | num_events++; |
3302 | ||
3303 | if (num_events == 0) | |
3304 | return NULL; | |
3305 | ||
3306 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3307 | int random_selector = (int) ((num_events * (double) rand ()) |
3308 | / (RAND_MAX + 1.0)); | |
372316f1 PA |
3309 | |
3310 | if (debug_infrun && num_events > 1) | |
3311 | fprintf_unfiltered (gdb_stdlog, | |
3312 | "infrun: Found %d events, selecting #%d\n", | |
3313 | num_events, random_selector); | |
3314 | ||
3315 | /* Select the Nth thread that has had an event. */ | |
08036331 PA |
3316 | for (thread_info *tp : all_non_exited_threads (waiton_ptid)) |
3317 | if (has_event (tp)) | |
372316f1 | 3318 | if (random_selector-- == 0) |
08036331 | 3319 | return tp; |
372316f1 | 3320 | |
08036331 | 3321 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3322 | } |
3323 | ||
3324 | /* Wrapper for target_wait that first checks whether threads have | |
3325 | pending statuses to report before actually asking the target for | |
3326 | more events. */ | |
3327 | ||
3328 | static ptid_t | |
3329 | do_target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
3330 | { | |
3331 | ptid_t event_ptid; | |
3332 | struct thread_info *tp; | |
3333 | ||
3334 | /* First check if there is a resumed thread with a wait status | |
3335 | pending. */ | |
d7e15655 | 3336 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 PA |
3337 | { |
3338 | tp = random_pending_event_thread (ptid); | |
3339 | } | |
3340 | else | |
3341 | { | |
3342 | if (debug_infrun) | |
3343 | fprintf_unfiltered (gdb_stdlog, | |
3344 | "infrun: Waiting for specific thread %s.\n", | |
3345 | target_pid_to_str (ptid)); | |
3346 | ||
3347 | /* We have a specific thread to check. */ | |
3348 | tp = find_thread_ptid (ptid); | |
3349 | gdb_assert (tp != NULL); | |
3350 | if (!tp->suspend.waitstatus_pending_p) | |
3351 | tp = NULL; | |
3352 | } | |
3353 | ||
3354 | if (tp != NULL | |
3355 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3356 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3357 | { | |
00431a78 | 3358 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3359 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3360 | CORE_ADDR pc; |
3361 | int discard = 0; | |
3362 | ||
3363 | pc = regcache_read_pc (regcache); | |
3364 | ||
3365 | if (pc != tp->suspend.stop_pc) | |
3366 | { | |
3367 | if (debug_infrun) | |
3368 | fprintf_unfiltered (gdb_stdlog, | |
3369 | "infrun: PC of %s changed. was=%s, now=%s\n", | |
3370 | target_pid_to_str (tp->ptid), | |
defd2172 | 3371 | paddress (gdbarch, tp->suspend.stop_pc), |
372316f1 PA |
3372 | paddress (gdbarch, pc)); |
3373 | discard = 1; | |
3374 | } | |
a01bda52 | 3375 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 PA |
3376 | { |
3377 | if (debug_infrun) | |
3378 | fprintf_unfiltered (gdb_stdlog, | |
3379 | "infrun: previous breakpoint of %s, at %s gone\n", | |
3380 | target_pid_to_str (tp->ptid), | |
3381 | paddress (gdbarch, pc)); | |
3382 | ||
3383 | discard = 1; | |
3384 | } | |
3385 | ||
3386 | if (discard) | |
3387 | { | |
3388 | if (debug_infrun) | |
3389 | fprintf_unfiltered (gdb_stdlog, | |
3390 | "infrun: pending event of %s cancelled.\n", | |
3391 | target_pid_to_str (tp->ptid)); | |
3392 | ||
3393 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3394 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3395 | } | |
3396 | } | |
3397 | ||
3398 | if (tp != NULL) | |
3399 | { | |
3400 | if (debug_infrun) | |
3401 | { | |
23fdd69e SM |
3402 | std::string statstr |
3403 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 3404 | |
372316f1 PA |
3405 | fprintf_unfiltered (gdb_stdlog, |
3406 | "infrun: Using pending wait status %s for %s.\n", | |
23fdd69e | 3407 | statstr.c_str (), |
372316f1 | 3408 | target_pid_to_str (tp->ptid)); |
372316f1 PA |
3409 | } |
3410 | ||
3411 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3412 | if it was a software breakpoint (and the target doesn't | |
3413 | always adjust the PC itself). */ | |
3414 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3415 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3416 | { | |
3417 | struct regcache *regcache; | |
3418 | struct gdbarch *gdbarch; | |
3419 | int decr_pc; | |
3420 | ||
00431a78 | 3421 | regcache = get_thread_regcache (tp); |
ac7936df | 3422 | gdbarch = regcache->arch (); |
372316f1 PA |
3423 | |
3424 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3425 | if (decr_pc != 0) | |
3426 | { | |
3427 | CORE_ADDR pc; | |
3428 | ||
3429 | pc = regcache_read_pc (regcache); | |
3430 | regcache_write_pc (regcache, pc + decr_pc); | |
3431 | } | |
3432 | } | |
3433 | ||
3434 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3435 | *status = tp->suspend.waitstatus; | |
3436 | tp->suspend.waitstatus_pending_p = 0; | |
3437 | ||
3438 | /* Wake up the event loop again, until all pending events are | |
3439 | processed. */ | |
3440 | if (target_is_async_p ()) | |
3441 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3442 | return tp->ptid; | |
3443 | } | |
3444 | ||
3445 | /* But if we don't find one, we'll have to wait. */ | |
3446 | ||
3447 | if (deprecated_target_wait_hook) | |
3448 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3449 | else | |
3450 | event_ptid = target_wait (ptid, status, options); | |
3451 | ||
3452 | return event_ptid; | |
3453 | } | |
3454 | ||
24291992 PA |
3455 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3456 | detaching while a thread is displaced stepping is a recipe for | |
3457 | crashing it, as nothing would readjust the PC out of the scratch | |
3458 | pad. */ | |
3459 | ||
3460 | void | |
3461 | prepare_for_detach (void) | |
3462 | { | |
3463 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3464 | ptid_t pid_ptid = ptid_t (inf->pid); |
24291992 | 3465 | |
00431a78 | 3466 | displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf); |
24291992 PA |
3467 | |
3468 | /* Is any thread of this process displaced stepping? If not, | |
3469 | there's nothing else to do. */ | |
d20172fc | 3470 | if (displaced->step_thread == nullptr) |
24291992 PA |
3471 | return; |
3472 | ||
3473 | if (debug_infrun) | |
3474 | fprintf_unfiltered (gdb_stdlog, | |
3475 | "displaced-stepping in-process while detaching"); | |
3476 | ||
9bcb1f16 | 3477 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3478 | |
00431a78 | 3479 | while (displaced->step_thread != nullptr) |
24291992 | 3480 | { |
24291992 PA |
3481 | struct execution_control_state ecss; |
3482 | struct execution_control_state *ecs; | |
3483 | ||
3484 | ecs = &ecss; | |
3485 | memset (ecs, 0, sizeof (*ecs)); | |
3486 | ||
3487 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3488 | /* Flush target cache before starting to handle each event. |
3489 | Target was running and cache could be stale. This is just a | |
3490 | heuristic. Running threads may modify target memory, but we | |
3491 | don't get any event. */ | |
3492 | target_dcache_invalidate (); | |
24291992 | 3493 | |
372316f1 | 3494 | ecs->ptid = do_target_wait (pid_ptid, &ecs->ws, 0); |
24291992 PA |
3495 | |
3496 | if (debug_infrun) | |
3497 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3498 | ||
3499 | /* If an error happens while handling the event, propagate GDB's | |
3500 | knowledge of the executing state to the frontend/user running | |
3501 | state. */ | |
731f534f | 3502 | scoped_finish_thread_state finish_state (minus_one_ptid); |
24291992 PA |
3503 | |
3504 | /* Now figure out what to do with the result of the result. */ | |
3505 | handle_inferior_event (ecs); | |
3506 | ||
3507 | /* No error, don't finish the state yet. */ | |
731f534f | 3508 | finish_state.release (); |
24291992 PA |
3509 | |
3510 | /* Breakpoints and watchpoints are not installed on the target | |
3511 | at this point, and signals are passed directly to the | |
3512 | inferior, so this must mean the process is gone. */ | |
3513 | if (!ecs->wait_some_more) | |
3514 | { | |
9bcb1f16 | 3515 | restore_detaching.release (); |
24291992 PA |
3516 | error (_("Program exited while detaching")); |
3517 | } | |
3518 | } | |
3519 | ||
9bcb1f16 | 3520 | restore_detaching.release (); |
24291992 PA |
3521 | } |
3522 | ||
cd0fc7c3 | 3523 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3524 | |
cd0fc7c3 SS |
3525 | If inferior gets a signal, we may decide to start it up again |
3526 | instead of returning. That is why there is a loop in this function. | |
3527 | When this function actually returns it means the inferior | |
3528 | should be left stopped and GDB should read more commands. */ | |
3529 | ||
3530 | void | |
e4c8541f | 3531 | wait_for_inferior (void) |
cd0fc7c3 | 3532 | { |
527159b7 | 3533 | if (debug_infrun) |
ae123ec6 | 3534 | fprintf_unfiltered |
e4c8541f | 3535 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3536 | |
4c41382a | 3537 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3538 | |
e6f5c25b PA |
3539 | /* If an error happens while handling the event, propagate GDB's |
3540 | knowledge of the executing state to the frontend/user running | |
3541 | state. */ | |
731f534f | 3542 | scoped_finish_thread_state finish_state (minus_one_ptid); |
e6f5c25b | 3543 | |
c906108c SS |
3544 | while (1) |
3545 | { | |
ae25568b PA |
3546 | struct execution_control_state ecss; |
3547 | struct execution_control_state *ecs = &ecss; | |
963f9c80 | 3548 | ptid_t waiton_ptid = minus_one_ptid; |
29f49a6a | 3549 | |
ae25568b PA |
3550 | memset (ecs, 0, sizeof (*ecs)); |
3551 | ||
ec9499be | 3552 | overlay_cache_invalid = 1; |
ec9499be | 3553 | |
f15cb84a YQ |
3554 | /* Flush target cache before starting to handle each event. |
3555 | Target was running and cache could be stale. This is just a | |
3556 | heuristic. Running threads may modify target memory, but we | |
3557 | don't get any event. */ | |
3558 | target_dcache_invalidate (); | |
3559 | ||
372316f1 | 3560 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 3561 | |
f00150c9 | 3562 | if (debug_infrun) |
223698f8 | 3563 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3564 | |
cd0fc7c3 SS |
3565 | /* Now figure out what to do with the result of the result. */ |
3566 | handle_inferior_event (ecs); | |
c906108c | 3567 | |
cd0fc7c3 SS |
3568 | if (!ecs->wait_some_more) |
3569 | break; | |
3570 | } | |
4e1c45ea | 3571 | |
e6f5c25b | 3572 | /* No error, don't finish the state yet. */ |
731f534f | 3573 | finish_state.release (); |
cd0fc7c3 | 3574 | } |
c906108c | 3575 | |
d3d4baed PA |
3576 | /* Cleanup that reinstalls the readline callback handler, if the |
3577 | target is running in the background. If while handling the target | |
3578 | event something triggered a secondary prompt, like e.g., a | |
3579 | pagination prompt, we'll have removed the callback handler (see | |
3580 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3581 | event loop, ready to process further input. Note this has no | |
3582 | effect if the handler hasn't actually been removed, because calling | |
3583 | rl_callback_handler_install resets the line buffer, thus losing | |
3584 | input. */ | |
3585 | ||
3586 | static void | |
d238133d | 3587 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 3588 | { |
3b12939d PA |
3589 | struct ui *ui = current_ui; |
3590 | ||
3591 | if (!ui->async) | |
6c400b59 PA |
3592 | { |
3593 | /* We're not going back to the top level event loop yet. Don't | |
3594 | install the readline callback, as it'd prep the terminal, | |
3595 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3596 | it the next time the prompt is displayed, when we're ready | |
3597 | for input. */ | |
3598 | return; | |
3599 | } | |
3600 | ||
3b12939d | 3601 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3602 | gdb_rl_callback_handler_reinstall (); |
3603 | } | |
3604 | ||
243a9253 PA |
3605 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3606 | that's just the event thread. In all-stop, that's all threads. */ | |
3607 | ||
3608 | static void | |
3609 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3610 | { | |
08036331 PA |
3611 | if (ecs->event_thread != NULL |
3612 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 3613 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
3614 | |
3615 | if (!non_stop) | |
3616 | { | |
08036331 | 3617 | for (thread_info *thr : all_non_exited_threads ()) |
243a9253 PA |
3618 | { |
3619 | if (thr->thread_fsm == NULL) | |
3620 | continue; | |
3621 | if (thr == ecs->event_thread) | |
3622 | continue; | |
3623 | ||
00431a78 | 3624 | switch_to_thread (thr); |
46e3ed7f | 3625 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
3626 | } |
3627 | ||
3628 | if (ecs->event_thread != NULL) | |
00431a78 | 3629 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3630 | } |
3631 | } | |
3632 | ||
3b12939d PA |
3633 | /* Helper for all_uis_check_sync_execution_done that works on the |
3634 | current UI. */ | |
3635 | ||
3636 | static void | |
3637 | check_curr_ui_sync_execution_done (void) | |
3638 | { | |
3639 | struct ui *ui = current_ui; | |
3640 | ||
3641 | if (ui->prompt_state == PROMPT_NEEDED | |
3642 | && ui->async | |
3643 | && !gdb_in_secondary_prompt_p (ui)) | |
3644 | { | |
223ffa71 | 3645 | target_terminal::ours (); |
76727919 | 3646 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3647 | ui_register_input_event_handler (ui); |
3b12939d PA |
3648 | } |
3649 | } | |
3650 | ||
3651 | /* See infrun.h. */ | |
3652 | ||
3653 | void | |
3654 | all_uis_check_sync_execution_done (void) | |
3655 | { | |
0e454242 | 3656 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3657 | { |
3658 | check_curr_ui_sync_execution_done (); | |
3659 | } | |
3660 | } | |
3661 | ||
a8836c93 PA |
3662 | /* See infrun.h. */ |
3663 | ||
3664 | void | |
3665 | all_uis_on_sync_execution_starting (void) | |
3666 | { | |
0e454242 | 3667 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3668 | { |
3669 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3670 | async_disable_stdin (); | |
3671 | } | |
3672 | } | |
3673 | ||
1777feb0 | 3674 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3675 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3676 | descriptor corresponding to the target. It can be called more than |
3677 | once to complete a single execution command. In such cases we need | |
3678 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3679 | that this function is called for a single execution command, then |
3680 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3681 | necessary cleanups. */ |
43ff13b4 JM |
3682 | |
3683 | void | |
fba45db2 | 3684 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3685 | { |
0d1e5fa7 | 3686 | struct execution_control_state ecss; |
a474d7c2 | 3687 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 3688 | int cmd_done = 0; |
963f9c80 | 3689 | ptid_t waiton_ptid = minus_one_ptid; |
43ff13b4 | 3690 | |
0d1e5fa7 PA |
3691 | memset (ecs, 0, sizeof (*ecs)); |
3692 | ||
c61db772 PA |
3693 | /* Events are always processed with the main UI as current UI. This |
3694 | way, warnings, debug output, etc. are always consistently sent to | |
3695 | the main console. */ | |
4b6749b9 | 3696 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3697 | |
d3d4baed | 3698 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
3699 | { |
3700 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
3701 | ||
3702 | /* We're handling a live event, so make sure we're doing live | |
3703 | debugging. If we're looking at traceframes while the target is | |
3704 | running, we're going to need to get back to that mode after | |
3705 | handling the event. */ | |
3706 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
3707 | if (non_stop) | |
3708 | { | |
3709 | maybe_restore_traceframe.emplace (); | |
3710 | set_current_traceframe (-1); | |
3711 | } | |
43ff13b4 | 3712 | |
d238133d TT |
3713 | gdb::optional<scoped_restore_current_thread> maybe_restore_thread; |
3714 | ||
3715 | if (non_stop) | |
3716 | /* In non-stop mode, the user/frontend should not notice a thread | |
3717 | switch due to internal events. Make sure we reverse to the | |
3718 | user selected thread and frame after handling the event and | |
3719 | running any breakpoint commands. */ | |
3720 | maybe_restore_thread.emplace (); | |
3721 | ||
3722 | overlay_cache_invalid = 1; | |
3723 | /* Flush target cache before starting to handle each event. Target | |
3724 | was running and cache could be stale. This is just a heuristic. | |
3725 | Running threads may modify target memory, but we don't get any | |
3726 | event. */ | |
3727 | target_dcache_invalidate (); | |
3728 | ||
3729 | scoped_restore save_exec_dir | |
3730 | = make_scoped_restore (&execution_direction, | |
3731 | target_execution_direction ()); | |
3732 | ||
3733 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, | |
3734 | target_can_async_p () ? TARGET_WNOHANG : 0); | |
3735 | ||
3736 | if (debug_infrun) | |
3737 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); | |
3738 | ||
3739 | /* If an error happens while handling the event, propagate GDB's | |
3740 | knowledge of the executing state to the frontend/user running | |
3741 | state. */ | |
3742 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
3743 | scoped_finish_thread_state finish_state (finish_ptid); | |
3744 | ||
979a0d13 | 3745 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
3746 | still for the thread which has thrown the exception. */ |
3747 | auto defer_bpstat_clear | |
3748 | = make_scope_exit (bpstat_clear_actions); | |
3749 | auto defer_delete_threads | |
3750 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
3751 | ||
3752 | /* Now figure out what to do with the result of the result. */ | |
3753 | handle_inferior_event (ecs); | |
3754 | ||
3755 | if (!ecs->wait_some_more) | |
3756 | { | |
3757 | struct inferior *inf = find_inferior_ptid (ecs->ptid); | |
3758 | int should_stop = 1; | |
3759 | struct thread_info *thr = ecs->event_thread; | |
d6b48e9c | 3760 | |
d238133d | 3761 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3762 | |
d238133d TT |
3763 | if (thr != NULL) |
3764 | { | |
3765 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 3766 | |
d238133d | 3767 | if (thread_fsm != NULL) |
46e3ed7f | 3768 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 3769 | } |
243a9253 | 3770 | |
d238133d TT |
3771 | if (!should_stop) |
3772 | { | |
3773 | keep_going (ecs); | |
3774 | } | |
3775 | else | |
3776 | { | |
46e3ed7f | 3777 | bool should_notify_stop = true; |
d238133d | 3778 | int proceeded = 0; |
1840d81a | 3779 | |
d238133d | 3780 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 3781 | |
d238133d | 3782 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 3783 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 3784 | |
d238133d TT |
3785 | if (should_notify_stop) |
3786 | { | |
3787 | /* We may not find an inferior if this was a process exit. */ | |
3788 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
3789 | proceeded = normal_stop (); | |
3790 | } | |
243a9253 | 3791 | |
d238133d TT |
3792 | if (!proceeded) |
3793 | { | |
3794 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
3795 | cmd_done = 1; | |
3796 | } | |
3797 | } | |
3798 | } | |
4f8d22e3 | 3799 | |
d238133d TT |
3800 | defer_delete_threads.release (); |
3801 | defer_bpstat_clear.release (); | |
29f49a6a | 3802 | |
d238133d TT |
3803 | /* No error, don't finish the thread states yet. */ |
3804 | finish_state.release (); | |
731f534f | 3805 | |
d238133d TT |
3806 | /* This scope is used to ensure that readline callbacks are |
3807 | reinstalled here. */ | |
3808 | } | |
4f8d22e3 | 3809 | |
3b12939d PA |
3810 | /* If a UI was in sync execution mode, and now isn't, restore its |
3811 | prompt (a synchronous execution command has finished, and we're | |
3812 | ready for input). */ | |
3813 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
3814 | |
3815 | if (cmd_done | |
0f641c01 | 3816 | && exec_done_display_p |
00431a78 PA |
3817 | && (inferior_ptid == null_ptid |
3818 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 3819 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
3820 | } |
3821 | ||
edb3359d DJ |
3822 | /* Record the frame and location we're currently stepping through. */ |
3823 | void | |
3824 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
3825 | { | |
3826 | struct thread_info *tp = inferior_thread (); | |
3827 | ||
16c381f0 JK |
3828 | tp->control.step_frame_id = get_frame_id (frame); |
3829 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
3830 | |
3831 | tp->current_symtab = sal.symtab; | |
3832 | tp->current_line = sal.line; | |
3833 | } | |
3834 | ||
0d1e5fa7 PA |
3835 | /* Clear context switchable stepping state. */ |
3836 | ||
3837 | void | |
4e1c45ea | 3838 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 3839 | { |
7f5ef605 | 3840 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 3841 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 3842 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 3843 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
3844 | } |
3845 | ||
c32c64b7 DE |
3846 | /* Set the cached copy of the last ptid/waitstatus. */ |
3847 | ||
6efcd9a8 | 3848 | void |
c32c64b7 DE |
3849 | set_last_target_status (ptid_t ptid, struct target_waitstatus status) |
3850 | { | |
3851 | target_last_wait_ptid = ptid; | |
3852 | target_last_waitstatus = status; | |
3853 | } | |
3854 | ||
e02bc4cc | 3855 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
3856 | target_wait()/deprecated_target_wait_hook(). The data is actually |
3857 | cached by handle_inferior_event(), which gets called immediately | |
3858 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
3859 | |
3860 | void | |
488f131b | 3861 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 3862 | { |
39f77062 | 3863 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
3864 | *status = target_last_waitstatus; |
3865 | } | |
3866 | ||
ac264b3b MS |
3867 | void |
3868 | nullify_last_target_wait_ptid (void) | |
3869 | { | |
3870 | target_last_wait_ptid = minus_one_ptid; | |
3871 | } | |
3872 | ||
dcf4fbde | 3873 | /* Switch thread contexts. */ |
dd80620e MS |
3874 | |
3875 | static void | |
00431a78 | 3876 | context_switch (execution_control_state *ecs) |
dd80620e | 3877 | { |
00431a78 PA |
3878 | if (debug_infrun |
3879 | && ecs->ptid != inferior_ptid | |
3880 | && ecs->event_thread != inferior_thread ()) | |
fd48f117 DJ |
3881 | { |
3882 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
3883 | target_pid_to_str (inferior_ptid)); | |
3884 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
00431a78 | 3885 | target_pid_to_str (ecs->ptid)); |
fd48f117 DJ |
3886 | } |
3887 | ||
00431a78 | 3888 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
3889 | } |
3890 | ||
d8dd4d5f PA |
3891 | /* If the target can't tell whether we've hit breakpoints |
3892 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
3893 | check whether that could have been caused by a breakpoint. If so, | |
3894 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
3895 | ||
4fa8626c | 3896 | static void |
d8dd4d5f PA |
3897 | adjust_pc_after_break (struct thread_info *thread, |
3898 | struct target_waitstatus *ws) | |
4fa8626c | 3899 | { |
24a73cce UW |
3900 | struct regcache *regcache; |
3901 | struct gdbarch *gdbarch; | |
118e6252 | 3902 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 3903 | |
4fa8626c DJ |
3904 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
3905 | we aren't, just return. | |
9709f61c DJ |
3906 | |
3907 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
3908 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
3909 | implemented by software breakpoints should be handled through the normal | |
3910 | breakpoint layer. | |
8fb3e588 | 3911 | |
4fa8626c DJ |
3912 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
3913 | different signals (SIGILL or SIGEMT for instance), but it is less | |
3914 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
3915 | gdbarch_decr_pc_after_break. I don't know any specific target that |
3916 | generates these signals at breakpoints (the code has been in GDB since at | |
3917 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 3918 | |
e6cf7916 UW |
3919 | In earlier versions of GDB, a target with |
3920 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
3921 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
3922 | target with both of these set in GDB history, and it seems unlikely to be | |
3923 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 3924 | |
d8dd4d5f | 3925 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
3926 | return; |
3927 | ||
d8dd4d5f | 3928 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
3929 | return; |
3930 | ||
4058b839 PA |
3931 | /* In reverse execution, when a breakpoint is hit, the instruction |
3932 | under it has already been de-executed. The reported PC always | |
3933 | points at the breakpoint address, so adjusting it further would | |
3934 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
3935 | architecture: | |
3936 | ||
3937 | B1 0x08000000 : INSN1 | |
3938 | B2 0x08000001 : INSN2 | |
3939 | 0x08000002 : INSN3 | |
3940 | PC -> 0x08000003 : INSN4 | |
3941 | ||
3942 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
3943 | from that point should hit B2 as below. Reading the PC when the | |
3944 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
3945 | been de-executed already. | |
3946 | ||
3947 | B1 0x08000000 : INSN1 | |
3948 | B2 PC -> 0x08000001 : INSN2 | |
3949 | 0x08000002 : INSN3 | |
3950 | 0x08000003 : INSN4 | |
3951 | ||
3952 | We can't apply the same logic as for forward execution, because | |
3953 | we would wrongly adjust the PC to 0x08000000, since there's a | |
3954 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
3955 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
3956 | behaviour. */ | |
3957 | if (execution_direction == EXEC_REVERSE) | |
3958 | return; | |
3959 | ||
1cf4d951 PA |
3960 | /* If the target can tell whether the thread hit a SW breakpoint, |
3961 | trust it. Targets that can tell also adjust the PC | |
3962 | themselves. */ | |
3963 | if (target_supports_stopped_by_sw_breakpoint ()) | |
3964 | return; | |
3965 | ||
3966 | /* Note that relying on whether a breakpoint is planted in memory to | |
3967 | determine this can fail. E.g,. the breakpoint could have been | |
3968 | removed since. Or the thread could have been told to step an | |
3969 | instruction the size of a breakpoint instruction, and only | |
3970 | _after_ was a breakpoint inserted at its address. */ | |
3971 | ||
24a73cce UW |
3972 | /* If this target does not decrement the PC after breakpoints, then |
3973 | we have nothing to do. */ | |
00431a78 | 3974 | regcache = get_thread_regcache (thread); |
ac7936df | 3975 | gdbarch = regcache->arch (); |
118e6252 | 3976 | |
527a273a | 3977 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 3978 | if (decr_pc == 0) |
24a73cce UW |
3979 | return; |
3980 | ||
8b86c959 | 3981 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 3982 | |
8aad930b AC |
3983 | /* Find the location where (if we've hit a breakpoint) the |
3984 | breakpoint would be. */ | |
118e6252 | 3985 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 3986 | |
1cf4d951 PA |
3987 | /* If the target can't tell whether a software breakpoint triggered, |
3988 | fallback to figuring it out based on breakpoints we think were | |
3989 | inserted in the target, and on whether the thread was stepped or | |
3990 | continued. */ | |
3991 | ||
1c5cfe86 PA |
3992 | /* Check whether there actually is a software breakpoint inserted at |
3993 | that location. | |
3994 | ||
3995 | If in non-stop mode, a race condition is possible where we've | |
3996 | removed a breakpoint, but stop events for that breakpoint were | |
3997 | already queued and arrive later. To suppress those spurious | |
3998 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
3999 | and retire them after a number of stop events are reported. Note |
4000 | this is an heuristic and can thus get confused. The real fix is | |
4001 | to get the "stopped by SW BP and needs adjustment" info out of | |
4002 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4003 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4004 | || (target_is_non_stop_p () |
4005 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4006 | { |
07036511 | 4007 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4008 | |
8213266a | 4009 | if (record_full_is_used ()) |
07036511 TT |
4010 | restore_operation_disable.emplace |
4011 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4012 | |
1c0fdd0e UW |
4013 | /* When using hardware single-step, a SIGTRAP is reported for both |
4014 | a completed single-step and a software breakpoint. Need to | |
4015 | differentiate between the two, as the latter needs adjusting | |
4016 | but the former does not. | |
4017 | ||
4018 | The SIGTRAP can be due to a completed hardware single-step only if | |
4019 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4020 | - this thread is currently being stepped |
4021 | ||
4022 | If any of these events did not occur, we must have stopped due | |
4023 | to hitting a software breakpoint, and have to back up to the | |
4024 | breakpoint address. | |
4025 | ||
4026 | As a special case, we could have hardware single-stepped a | |
4027 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4028 | we also need to back up to the breakpoint address. */ | |
4029 | ||
d8dd4d5f PA |
4030 | if (thread_has_single_step_breakpoints_set (thread) |
4031 | || !currently_stepping (thread) | |
4032 | || (thread->stepped_breakpoint | |
4033 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4034 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4035 | } |
4fa8626c DJ |
4036 | } |
4037 | ||
edb3359d DJ |
4038 | static int |
4039 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4040 | { | |
4041 | for (frame = get_prev_frame (frame); | |
4042 | frame != NULL; | |
4043 | frame = get_prev_frame (frame)) | |
4044 | { | |
4045 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4046 | return 1; | |
4047 | if (get_frame_type (frame) != INLINE_FRAME) | |
4048 | break; | |
4049 | } | |
4050 | ||
4051 | return 0; | |
4052 | } | |
4053 | ||
c65d6b55 PA |
4054 | /* If the event thread has the stop requested flag set, pretend it |
4055 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4056 | target_stop). */ | |
4057 | ||
4058 | static bool | |
4059 | handle_stop_requested (struct execution_control_state *ecs) | |
4060 | { | |
4061 | if (ecs->event_thread->stop_requested) | |
4062 | { | |
4063 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4064 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4065 | handle_signal_stop (ecs); | |
4066 | return true; | |
4067 | } | |
4068 | return false; | |
4069 | } | |
4070 | ||
a96d9b2e SDJ |
4071 | /* Auxiliary function that handles syscall entry/return events. |
4072 | It returns 1 if the inferior should keep going (and GDB | |
4073 | should ignore the event), or 0 if the event deserves to be | |
4074 | processed. */ | |
ca2163eb | 4075 | |
a96d9b2e | 4076 | static int |
ca2163eb | 4077 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4078 | { |
ca2163eb | 4079 | struct regcache *regcache; |
ca2163eb PA |
4080 | int syscall_number; |
4081 | ||
00431a78 | 4082 | context_switch (ecs); |
ca2163eb | 4083 | |
00431a78 | 4084 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4085 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4086 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4087 | |
a96d9b2e SDJ |
4088 | if (catch_syscall_enabled () > 0 |
4089 | && catching_syscall_number (syscall_number) > 0) | |
4090 | { | |
4091 | if (debug_infrun) | |
4092 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
4093 | syscall_number); | |
a96d9b2e | 4094 | |
16c381f0 | 4095 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4096 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4097 | ecs->event_thread->suspend.stop_pc, |
4098 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4099 | |
c65d6b55 PA |
4100 | if (handle_stop_requested (ecs)) |
4101 | return 0; | |
4102 | ||
ce12b012 | 4103 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4104 | { |
4105 | /* Catchpoint hit. */ | |
ca2163eb PA |
4106 | return 0; |
4107 | } | |
a96d9b2e | 4108 | } |
ca2163eb | 4109 | |
c65d6b55 PA |
4110 | if (handle_stop_requested (ecs)) |
4111 | return 0; | |
4112 | ||
ca2163eb | 4113 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb PA |
4114 | keep_going (ecs); |
4115 | return 1; | |
a96d9b2e SDJ |
4116 | } |
4117 | ||
7e324e48 GB |
4118 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4119 | ||
4120 | static void | |
4121 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4122 | struct execution_control_state *ecs) | |
4123 | { | |
4124 | if (!ecs->stop_func_filled_in) | |
4125 | { | |
4126 | /* Don't care about return value; stop_func_start and stop_func_name | |
4127 | will both be 0 if it doesn't work. */ | |
59adbf5d KB |
4128 | find_function_entry_range_from_pc (ecs->event_thread->suspend.stop_pc, |
4129 | &ecs->stop_func_name, | |
4130 | &ecs->stop_func_start, | |
4131 | &ecs->stop_func_end); | |
7e324e48 GB |
4132 | ecs->stop_func_start |
4133 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4134 | ||
591a12a1 UW |
4135 | if (gdbarch_skip_entrypoint_p (gdbarch)) |
4136 | ecs->stop_func_start = gdbarch_skip_entrypoint (gdbarch, | |
4137 | ecs->stop_func_start); | |
4138 | ||
7e324e48 GB |
4139 | ecs->stop_func_filled_in = 1; |
4140 | } | |
4141 | } | |
4142 | ||
4f5d7f63 | 4143 | |
00431a78 | 4144 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4145 | |
4146 | static enum stop_kind | |
00431a78 | 4147 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4148 | { |
00431a78 | 4149 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
4f5d7f63 PA |
4150 | |
4151 | gdb_assert (inf != NULL); | |
4152 | return inf->control.stop_soon; | |
4153 | } | |
4154 | ||
372316f1 PA |
4155 | /* Wait for one event. Store the resulting waitstatus in WS, and |
4156 | return the event ptid. */ | |
4157 | ||
4158 | static ptid_t | |
4159 | wait_one (struct target_waitstatus *ws) | |
4160 | { | |
4161 | ptid_t event_ptid; | |
4162 | ptid_t wait_ptid = minus_one_ptid; | |
4163 | ||
4164 | overlay_cache_invalid = 1; | |
4165 | ||
4166 | /* Flush target cache before starting to handle each event. | |
4167 | Target was running and cache could be stale. This is just a | |
4168 | heuristic. Running threads may modify target memory, but we | |
4169 | don't get any event. */ | |
4170 | target_dcache_invalidate (); | |
4171 | ||
4172 | if (deprecated_target_wait_hook) | |
4173 | event_ptid = deprecated_target_wait_hook (wait_ptid, ws, 0); | |
4174 | else | |
4175 | event_ptid = target_wait (wait_ptid, ws, 0); | |
4176 | ||
4177 | if (debug_infrun) | |
4178 | print_target_wait_results (wait_ptid, event_ptid, ws); | |
4179 | ||
4180 | return event_ptid; | |
4181 | } | |
4182 | ||
4183 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID | |
4184 | instead of the current thread. */ | |
4185 | #define THREAD_STOPPED_BY(REASON) \ | |
4186 | static int \ | |
4187 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4188 | { \ | |
2989a365 | 4189 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); \ |
372316f1 PA |
4190 | inferior_ptid = ptid; \ |
4191 | \ | |
2989a365 | 4192 | return target_stopped_by_ ## REASON (); \ |
372316f1 PA |
4193 | } |
4194 | ||
4195 | /* Generate thread_stopped_by_watchpoint. */ | |
4196 | THREAD_STOPPED_BY (watchpoint) | |
4197 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4198 | THREAD_STOPPED_BY (sw_breakpoint) | |
4199 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4200 | THREAD_STOPPED_BY (hw_breakpoint) | |
4201 | ||
372316f1 PA |
4202 | /* Save the thread's event and stop reason to process it later. */ |
4203 | ||
4204 | static void | |
4205 | save_waitstatus (struct thread_info *tp, struct target_waitstatus *ws) | |
4206 | { | |
372316f1 PA |
4207 | if (debug_infrun) |
4208 | { | |
23fdd69e | 4209 | std::string statstr = target_waitstatus_to_string (ws); |
372316f1 | 4210 | |
372316f1 PA |
4211 | fprintf_unfiltered (gdb_stdlog, |
4212 | "infrun: saving status %s for %d.%ld.%ld\n", | |
23fdd69e | 4213 | statstr.c_str (), |
e99b03dc | 4214 | tp->ptid.pid (), |
e38504b3 | 4215 | tp->ptid.lwp (), |
cc6bcb54 | 4216 | tp->ptid.tid ()); |
372316f1 PA |
4217 | } |
4218 | ||
4219 | /* Record for later. */ | |
4220 | tp->suspend.waitstatus = *ws; | |
4221 | tp->suspend.waitstatus_pending_p = 1; | |
4222 | ||
00431a78 | 4223 | struct regcache *regcache = get_thread_regcache (tp); |
8b86c959 | 4224 | const address_space *aspace = regcache->aspace (); |
372316f1 PA |
4225 | |
4226 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4227 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4228 | { | |
4229 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4230 | ||
4231 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4232 | ||
4233 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4234 | { | |
4235 | tp->suspend.stop_reason | |
4236 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4237 | } | |
4238 | else if (target_supports_stopped_by_sw_breakpoint () | |
4239 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4240 | { | |
4241 | tp->suspend.stop_reason | |
4242 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4243 | } | |
4244 | else if (target_supports_stopped_by_hw_breakpoint () | |
4245 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4246 | { | |
4247 | tp->suspend.stop_reason | |
4248 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4249 | } | |
4250 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4251 | && hardware_breakpoint_inserted_here_p (aspace, | |
4252 | pc)) | |
4253 | { | |
4254 | tp->suspend.stop_reason | |
4255 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4256 | } | |
4257 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4258 | && software_breakpoint_inserted_here_p (aspace, | |
4259 | pc)) | |
4260 | { | |
4261 | tp->suspend.stop_reason | |
4262 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4263 | } | |
4264 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4265 | && currently_stepping (tp)) | |
4266 | { | |
4267 | tp->suspend.stop_reason | |
4268 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4269 | } | |
4270 | } | |
4271 | } | |
4272 | ||
6efcd9a8 | 4273 | /* See infrun.h. */ |
372316f1 | 4274 | |
6efcd9a8 | 4275 | void |
372316f1 PA |
4276 | stop_all_threads (void) |
4277 | { | |
4278 | /* We may need multiple passes to discover all threads. */ | |
4279 | int pass; | |
4280 | int iterations = 0; | |
372316f1 | 4281 | |
fbea99ea | 4282 | gdb_assert (target_is_non_stop_p ()); |
372316f1 PA |
4283 | |
4284 | if (debug_infrun) | |
4285 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n"); | |
4286 | ||
00431a78 | 4287 | scoped_restore_current_thread restore_thread; |
372316f1 | 4288 | |
65706a29 | 4289 | target_thread_events (1); |
9885e6bb | 4290 | SCOPE_EXIT { target_thread_events (0); }; |
65706a29 | 4291 | |
372316f1 PA |
4292 | /* Request threads to stop, and then wait for the stops. Because |
4293 | threads we already know about can spawn more threads while we're | |
4294 | trying to stop them, and we only learn about new threads when we | |
4295 | update the thread list, do this in a loop, and keep iterating | |
4296 | until two passes find no threads that need to be stopped. */ | |
4297 | for (pass = 0; pass < 2; pass++, iterations++) | |
4298 | { | |
4299 | if (debug_infrun) | |
4300 | fprintf_unfiltered (gdb_stdlog, | |
4301 | "infrun: stop_all_threads, pass=%d, " | |
4302 | "iterations=%d\n", pass, iterations); | |
4303 | while (1) | |
4304 | { | |
4305 | ptid_t event_ptid; | |
4306 | struct target_waitstatus ws; | |
4307 | int need_wait = 0; | |
372316f1 PA |
4308 | |
4309 | update_thread_list (); | |
4310 | ||
4311 | /* Go through all threads looking for threads that we need | |
4312 | to tell the target to stop. */ | |
08036331 | 4313 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 PA |
4314 | { |
4315 | if (t->executing) | |
4316 | { | |
4317 | /* If already stopping, don't request a stop again. | |
4318 | We just haven't seen the notification yet. */ | |
4319 | if (!t->stop_requested) | |
4320 | { | |
4321 | if (debug_infrun) | |
4322 | fprintf_unfiltered (gdb_stdlog, | |
4323 | "infrun: %s executing, " | |
4324 | "need stop\n", | |
4325 | target_pid_to_str (t->ptid)); | |
4326 | target_stop (t->ptid); | |
4327 | t->stop_requested = 1; | |
4328 | } | |
4329 | else | |
4330 | { | |
4331 | if (debug_infrun) | |
4332 | fprintf_unfiltered (gdb_stdlog, | |
4333 | "infrun: %s executing, " | |
4334 | "already stopping\n", | |
4335 | target_pid_to_str (t->ptid)); | |
4336 | } | |
4337 | ||
4338 | if (t->stop_requested) | |
4339 | need_wait = 1; | |
4340 | } | |
4341 | else | |
4342 | { | |
4343 | if (debug_infrun) | |
4344 | fprintf_unfiltered (gdb_stdlog, | |
4345 | "infrun: %s not executing\n", | |
4346 | target_pid_to_str (t->ptid)); | |
4347 | ||
4348 | /* The thread may be not executing, but still be | |
4349 | resumed with a pending status to process. */ | |
4350 | t->resumed = 0; | |
4351 | } | |
4352 | } | |
4353 | ||
4354 | if (!need_wait) | |
4355 | break; | |
4356 | ||
4357 | /* If we find new threads on the second iteration, restart | |
4358 | over. We want to see two iterations in a row with all | |
4359 | threads stopped. */ | |
4360 | if (pass > 0) | |
4361 | pass = -1; | |
4362 | ||
4363 | event_ptid = wait_one (&ws); | |
00431a78 | 4364 | |
372316f1 PA |
4365 | if (ws.kind == TARGET_WAITKIND_NO_RESUMED) |
4366 | { | |
4367 | /* All resumed threads exited. */ | |
4368 | } | |
65706a29 PA |
4369 | else if (ws.kind == TARGET_WAITKIND_THREAD_EXITED |
4370 | || ws.kind == TARGET_WAITKIND_EXITED | |
372316f1 PA |
4371 | || ws.kind == TARGET_WAITKIND_SIGNALLED) |
4372 | { | |
4373 | if (debug_infrun) | |
4374 | { | |
f2907e49 | 4375 | ptid_t ptid = ptid_t (ws.value.integer); |
372316f1 PA |
4376 | |
4377 | fprintf_unfiltered (gdb_stdlog, | |
4378 | "infrun: %s exited while " | |
4379 | "stopping threads\n", | |
4380 | target_pid_to_str (ptid)); | |
4381 | } | |
4382 | } | |
4383 | else | |
4384 | { | |
08036331 | 4385 | thread_info *t = find_thread_ptid (event_ptid); |
372316f1 PA |
4386 | if (t == NULL) |
4387 | t = add_thread (event_ptid); | |
4388 | ||
4389 | t->stop_requested = 0; | |
4390 | t->executing = 0; | |
4391 | t->resumed = 0; | |
4392 | t->control.may_range_step = 0; | |
4393 | ||
6efcd9a8 PA |
4394 | /* This may be the first time we see the inferior report |
4395 | a stop. */ | |
08036331 | 4396 | inferior *inf = find_inferior_ptid (event_ptid); |
6efcd9a8 PA |
4397 | if (inf->needs_setup) |
4398 | { | |
4399 | switch_to_thread_no_regs (t); | |
4400 | setup_inferior (0); | |
4401 | } | |
4402 | ||
372316f1 PA |
4403 | if (ws.kind == TARGET_WAITKIND_STOPPED |
4404 | && ws.value.sig == GDB_SIGNAL_0) | |
4405 | { | |
4406 | /* We caught the event that we intended to catch, so | |
4407 | there's no event pending. */ | |
4408 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4409 | t->suspend.waitstatus_pending_p = 0; | |
4410 | ||
00431a78 | 4411 | if (displaced_step_fixup (t, GDB_SIGNAL_0) < 0) |
372316f1 PA |
4412 | { |
4413 | /* Add it back to the step-over queue. */ | |
4414 | if (debug_infrun) | |
4415 | { | |
4416 | fprintf_unfiltered (gdb_stdlog, | |
4417 | "infrun: displaced-step of %s " | |
4418 | "canceled: adding back to the " | |
4419 | "step-over queue\n", | |
4420 | target_pid_to_str (t->ptid)); | |
4421 | } | |
4422 | t->control.trap_expected = 0; | |
4423 | thread_step_over_chain_enqueue (t); | |
4424 | } | |
4425 | } | |
4426 | else | |
4427 | { | |
4428 | enum gdb_signal sig; | |
4429 | struct regcache *regcache; | |
372316f1 PA |
4430 | |
4431 | if (debug_infrun) | |
4432 | { | |
23fdd69e | 4433 | std::string statstr = target_waitstatus_to_string (&ws); |
372316f1 | 4434 | |
372316f1 PA |
4435 | fprintf_unfiltered (gdb_stdlog, |
4436 | "infrun: target_wait %s, saving " | |
4437 | "status for %d.%ld.%ld\n", | |
23fdd69e | 4438 | statstr.c_str (), |
e99b03dc | 4439 | t->ptid.pid (), |
e38504b3 | 4440 | t->ptid.lwp (), |
cc6bcb54 | 4441 | t->ptid.tid ()); |
372316f1 PA |
4442 | } |
4443 | ||
4444 | /* Record for later. */ | |
4445 | save_waitstatus (t, &ws); | |
4446 | ||
4447 | sig = (ws.kind == TARGET_WAITKIND_STOPPED | |
4448 | ? ws.value.sig : GDB_SIGNAL_0); | |
4449 | ||
00431a78 | 4450 | if (displaced_step_fixup (t, sig) < 0) |
372316f1 PA |
4451 | { |
4452 | /* Add it back to the step-over queue. */ | |
4453 | t->control.trap_expected = 0; | |
4454 | thread_step_over_chain_enqueue (t); | |
4455 | } | |
4456 | ||
00431a78 | 4457 | regcache = get_thread_regcache (t); |
372316f1 PA |
4458 | t->suspend.stop_pc = regcache_read_pc (regcache); |
4459 | ||
4460 | if (debug_infrun) | |
4461 | { | |
4462 | fprintf_unfiltered (gdb_stdlog, | |
4463 | "infrun: saved stop_pc=%s for %s " | |
4464 | "(currently_stepping=%d)\n", | |
4465 | paddress (target_gdbarch (), | |
4466 | t->suspend.stop_pc), | |
4467 | target_pid_to_str (t->ptid), | |
4468 | currently_stepping (t)); | |
4469 | } | |
4470 | } | |
4471 | } | |
4472 | } | |
4473 | } | |
4474 | ||
372316f1 PA |
4475 | if (debug_infrun) |
4476 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n"); | |
4477 | } | |
4478 | ||
f4836ba9 PA |
4479 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4480 | ||
4481 | static int | |
4482 | handle_no_resumed (struct execution_control_state *ecs) | |
4483 | { | |
3b12939d | 4484 | if (target_can_async_p ()) |
f4836ba9 | 4485 | { |
3b12939d PA |
4486 | struct ui *ui; |
4487 | int any_sync = 0; | |
f4836ba9 | 4488 | |
3b12939d PA |
4489 | ALL_UIS (ui) |
4490 | { | |
4491 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4492 | { | |
4493 | any_sync = 1; | |
4494 | break; | |
4495 | } | |
4496 | } | |
4497 | if (!any_sync) | |
4498 | { | |
4499 | /* There were no unwaited-for children left in the target, but, | |
4500 | we're not synchronously waiting for events either. Just | |
4501 | ignore. */ | |
4502 | ||
4503 | if (debug_infrun) | |
4504 | fprintf_unfiltered (gdb_stdlog, | |
4505 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4506 | "(ignoring: bg)\n"); | |
4507 | prepare_to_wait (ecs); | |
4508 | return 1; | |
4509 | } | |
f4836ba9 PA |
4510 | } |
4511 | ||
4512 | /* Otherwise, if we were running a synchronous execution command, we | |
4513 | may need to cancel it and give the user back the terminal. | |
4514 | ||
4515 | In non-stop mode, the target can't tell whether we've already | |
4516 | consumed previous stop events, so it can end up sending us a | |
4517 | no-resumed event like so: | |
4518 | ||
4519 | #0 - thread 1 is left stopped | |
4520 | ||
4521 | #1 - thread 2 is resumed and hits breakpoint | |
4522 | -> TARGET_WAITKIND_STOPPED | |
4523 | ||
4524 | #2 - thread 3 is resumed and exits | |
4525 | this is the last resumed thread, so | |
4526 | -> TARGET_WAITKIND_NO_RESUMED | |
4527 | ||
4528 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4529 | it. | |
4530 | ||
4531 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4532 | thread 2 is now resumed, so the event should be ignored. | |
4533 | ||
4534 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4535 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4536 | event. But it could be that the event meant that thread 2 itself | |
4537 | (or whatever other thread was the last resumed thread) exited. | |
4538 | ||
4539 | To address this we refresh the thread list and check whether we | |
4540 | have resumed threads _now_. In the example above, this removes | |
4541 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4542 | ignore this event. If we find no thread resumed, then we cancel | |
4543 | the synchronous command show "no unwaited-for " to the user. */ | |
4544 | update_thread_list (); | |
4545 | ||
08036331 | 4546 | for (thread_info *thread : all_non_exited_threads ()) |
f4836ba9 PA |
4547 | { |
4548 | if (thread->executing | |
4549 | || thread->suspend.waitstatus_pending_p) | |
4550 | { | |
4551 | /* There were no unwaited-for children left in the target at | |
4552 | some point, but there are now. Just ignore. */ | |
4553 | if (debug_infrun) | |
4554 | fprintf_unfiltered (gdb_stdlog, | |
4555 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4556 | "(ignoring: found resumed)\n"); | |
4557 | prepare_to_wait (ecs); | |
4558 | return 1; | |
4559 | } | |
4560 | } | |
4561 | ||
4562 | /* Note however that we may find no resumed thread because the whole | |
4563 | process exited meanwhile (thus updating the thread list results | |
4564 | in an empty thread list). In this case we know we'll be getting | |
4565 | a process exit event shortly. */ | |
08036331 | 4566 | for (inferior *inf : all_inferiors ()) |
f4836ba9 PA |
4567 | { |
4568 | if (inf->pid == 0) | |
4569 | continue; | |
4570 | ||
08036331 | 4571 | thread_info *thread = any_live_thread_of_inferior (inf); |
f4836ba9 PA |
4572 | if (thread == NULL) |
4573 | { | |
4574 | if (debug_infrun) | |
4575 | fprintf_unfiltered (gdb_stdlog, | |
4576 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4577 | "(expect process exit)\n"); | |
4578 | prepare_to_wait (ecs); | |
4579 | return 1; | |
4580 | } | |
4581 | } | |
4582 | ||
4583 | /* Go ahead and report the event. */ | |
4584 | return 0; | |
4585 | } | |
4586 | ||
05ba8510 PA |
4587 | /* Given an execution control state that has been freshly filled in by |
4588 | an event from the inferior, figure out what it means and take | |
4589 | appropriate action. | |
4590 | ||
4591 | The alternatives are: | |
4592 | ||
22bcd14b | 4593 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
4594 | debugger. |
4595 | ||
4596 | 2) keep_going and return; to wait for the next event (set | |
4597 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
4598 | once). */ | |
c906108c | 4599 | |
ec9499be | 4600 | static void |
0b6e5e10 | 4601 | handle_inferior_event_1 (struct execution_control_state *ecs) |
cd0fc7c3 | 4602 | { |
d6b48e9c PA |
4603 | enum stop_kind stop_soon; |
4604 | ||
28736962 PA |
4605 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
4606 | { | |
4607 | /* We had an event in the inferior, but we are not interested in | |
4608 | handling it at this level. The lower layers have already | |
4609 | done what needs to be done, if anything. | |
4610 | ||
4611 | One of the possible circumstances for this is when the | |
4612 | inferior produces output for the console. The inferior has | |
4613 | not stopped, and we are ignoring the event. Another possible | |
4614 | circumstance is any event which the lower level knows will be | |
4615 | reported multiple times without an intervening resume. */ | |
4616 | if (debug_infrun) | |
4617 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
4618 | prepare_to_wait (ecs); | |
4619 | return; | |
4620 | } | |
4621 | ||
65706a29 PA |
4622 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
4623 | { | |
4624 | if (debug_infrun) | |
4625 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_THREAD_EXITED\n"); | |
4626 | prepare_to_wait (ecs); | |
4627 | return; | |
4628 | } | |
4629 | ||
0e5bf2a8 | 4630 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
4631 | && handle_no_resumed (ecs)) |
4632 | return; | |
0e5bf2a8 | 4633 | |
1777feb0 | 4634 | /* Cache the last pid/waitstatus. */ |
c32c64b7 | 4635 | set_last_target_status (ecs->ptid, ecs->ws); |
e02bc4cc | 4636 | |
ca005067 | 4637 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 4638 | stop_stack_dummy = STOP_NONE; |
ca005067 | 4639 | |
0e5bf2a8 PA |
4640 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
4641 | { | |
4642 | /* No unwaited-for children left. IOW, all resumed children | |
4643 | have exited. */ | |
4644 | if (debug_infrun) | |
4645 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
4646 | ||
4647 | stop_print_frame = 0; | |
22bcd14b | 4648 | stop_waiting (ecs); |
0e5bf2a8 PA |
4649 | return; |
4650 | } | |
4651 | ||
8c90c137 | 4652 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 4653 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 PA |
4654 | { |
4655 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
4656 | /* If it's a new thread, add it to the thread database. */ | |
4657 | if (ecs->event_thread == NULL) | |
4658 | ecs->event_thread = add_thread (ecs->ptid); | |
c1e36e3e PA |
4659 | |
4660 | /* Disable range stepping. If the next step request could use a | |
4661 | range, this will be end up re-enabled then. */ | |
4662 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 4663 | } |
88ed393a JK |
4664 | |
4665 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 4666 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
4667 | |
4668 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
4669 | reinit_frame_cache (); | |
4670 | ||
28736962 PA |
4671 | breakpoint_retire_moribund (); |
4672 | ||
2b009048 DJ |
4673 | /* First, distinguish signals caused by the debugger from signals |
4674 | that have to do with the program's own actions. Note that | |
4675 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
4676 | on the operating system version. Here we detect when a SIGILL or | |
4677 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
4678 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
4679 | when we're trying to execute a breakpoint instruction on a | |
4680 | non-executable stack. This happens for call dummy breakpoints | |
4681 | for architectures like SPARC that place call dummies on the | |
4682 | stack. */ | |
2b009048 | 4683 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
4684 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
4685 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
4686 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 4687 | { |
00431a78 | 4688 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 4689 | |
a01bda52 | 4690 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
4691 | regcache_read_pc (regcache))) |
4692 | { | |
4693 | if (debug_infrun) | |
4694 | fprintf_unfiltered (gdb_stdlog, | |
4695 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 4696 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 4697 | } |
2b009048 DJ |
4698 | } |
4699 | ||
28736962 PA |
4700 | /* Mark the non-executing threads accordingly. In all-stop, all |
4701 | threads of all processes are stopped when we get any event | |
e1316e60 | 4702 | reported. In non-stop mode, only the event thread stops. */ |
372316f1 PA |
4703 | { |
4704 | ptid_t mark_ptid; | |
4705 | ||
fbea99ea | 4706 | if (!target_is_non_stop_p ()) |
372316f1 PA |
4707 | mark_ptid = minus_one_ptid; |
4708 | else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED | |
4709 | || ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4710 | { | |
4711 | /* If we're handling a process exit in non-stop mode, even | |
4712 | though threads haven't been deleted yet, one would think | |
4713 | that there is nothing to do, as threads of the dead process | |
4714 | will be soon deleted, and threads of any other process were | |
4715 | left running. However, on some targets, threads survive a | |
4716 | process exit event. E.g., for the "checkpoint" command, | |
4717 | when the current checkpoint/fork exits, linux-fork.c | |
4718 | automatically switches to another fork from within | |
4719 | target_mourn_inferior, by associating the same | |
4720 | inferior/thread to another fork. We haven't mourned yet at | |
4721 | this point, but we must mark any threads left in the | |
4722 | process as not-executing so that finish_thread_state marks | |
4723 | them stopped (in the user's perspective) if/when we present | |
4724 | the stop to the user. */ | |
e99b03dc | 4725 | mark_ptid = ptid_t (ecs->ptid.pid ()); |
372316f1 PA |
4726 | } |
4727 | else | |
4728 | mark_ptid = ecs->ptid; | |
4729 | ||
4730 | set_executing (mark_ptid, 0); | |
4731 | ||
4732 | /* Likewise the resumed flag. */ | |
4733 | set_resumed (mark_ptid, 0); | |
4734 | } | |
8c90c137 | 4735 | |
488f131b JB |
4736 | switch (ecs->ws.kind) |
4737 | { | |
4738 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 4739 | if (debug_infrun) |
8a9de0e4 | 4740 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
00431a78 | 4741 | context_switch (ecs); |
b0f4b84b DJ |
4742 | /* Ignore gracefully during startup of the inferior, as it might |
4743 | be the shell which has just loaded some objects, otherwise | |
4744 | add the symbols for the newly loaded objects. Also ignore at | |
4745 | the beginning of an attach or remote session; we will query | |
4746 | the full list of libraries once the connection is | |
4747 | established. */ | |
4f5d7f63 | 4748 | |
00431a78 | 4749 | stop_soon = get_inferior_stop_soon (ecs); |
c0236d92 | 4750 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 4751 | { |
edcc5120 TT |
4752 | struct regcache *regcache; |
4753 | ||
00431a78 | 4754 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 TT |
4755 | |
4756 | handle_solib_event (); | |
4757 | ||
4758 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 4759 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4760 | ecs->event_thread->suspend.stop_pc, |
4761 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4762 | |
c65d6b55 PA |
4763 | if (handle_stop_requested (ecs)) |
4764 | return; | |
4765 | ||
ce12b012 | 4766 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
4767 | { |
4768 | /* A catchpoint triggered. */ | |
94c57d6a PA |
4769 | process_event_stop_test (ecs); |
4770 | return; | |
edcc5120 | 4771 | } |
488f131b | 4772 | |
b0f4b84b DJ |
4773 | /* If requested, stop when the dynamic linker notifies |
4774 | gdb of events. This allows the user to get control | |
4775 | and place breakpoints in initializer routines for | |
4776 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 4777 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
4778 | if (stop_on_solib_events) |
4779 | { | |
55409f9d DJ |
4780 | /* Make sure we print "Stopped due to solib-event" in |
4781 | normal_stop. */ | |
4782 | stop_print_frame = 1; | |
4783 | ||
22bcd14b | 4784 | stop_waiting (ecs); |
b0f4b84b DJ |
4785 | return; |
4786 | } | |
488f131b | 4787 | } |
b0f4b84b DJ |
4788 | |
4789 | /* If we are skipping through a shell, or through shared library | |
4790 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 4791 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
4792 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
4793 | { | |
74960c60 VP |
4794 | /* Loading of shared libraries might have changed breakpoint |
4795 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 4796 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 4797 | insert_breakpoints (); |
64ce06e4 | 4798 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
4799 | prepare_to_wait (ecs); |
4800 | return; | |
4801 | } | |
4802 | ||
5c09a2c5 PA |
4803 | /* But stop if we're attaching or setting up a remote |
4804 | connection. */ | |
4805 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
4806 | || stop_soon == STOP_QUIETLY_REMOTE) | |
4807 | { | |
4808 | if (debug_infrun) | |
4809 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 4810 | stop_waiting (ecs); |
5c09a2c5 PA |
4811 | return; |
4812 | } | |
4813 | ||
4814 | internal_error (__FILE__, __LINE__, | |
4815 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 4816 | |
488f131b | 4817 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 4818 | if (debug_infrun) |
8a9de0e4 | 4819 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
c65d6b55 PA |
4820 | if (handle_stop_requested (ecs)) |
4821 | return; | |
00431a78 | 4822 | context_switch (ecs); |
64ce06e4 | 4823 | resume (GDB_SIGNAL_0); |
488f131b JB |
4824 | prepare_to_wait (ecs); |
4825 | return; | |
c5aa993b | 4826 | |
65706a29 PA |
4827 | case TARGET_WAITKIND_THREAD_CREATED: |
4828 | if (debug_infrun) | |
4829 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_THREAD_CREATED\n"); | |
c65d6b55 PA |
4830 | if (handle_stop_requested (ecs)) |
4831 | return; | |
00431a78 | 4832 | context_switch (ecs); |
65706a29 PA |
4833 | if (!switch_back_to_stepped_thread (ecs)) |
4834 | keep_going (ecs); | |
4835 | return; | |
4836 | ||
488f131b | 4837 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 4838 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 4839 | if (debug_infrun) |
940c3c06 PA |
4840 | { |
4841 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4842 | fprintf_unfiltered (gdb_stdlog, | |
4843 | "infrun: TARGET_WAITKIND_EXITED\n"); | |
4844 | else | |
4845 | fprintf_unfiltered (gdb_stdlog, | |
4846 | "infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
4847 | } | |
4848 | ||
fb66883a | 4849 | inferior_ptid = ecs->ptid; |
c9657e70 | 4850 | set_current_inferior (find_inferior_ptid (ecs->ptid)); |
6c95b8df PA |
4851 | set_current_program_space (current_inferior ()->pspace); |
4852 | handle_vfork_child_exec_or_exit (0); | |
223ffa71 | 4853 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 4854 | |
0c557179 SDJ |
4855 | /* Clearing any previous state of convenience variables. */ |
4856 | clear_exit_convenience_vars (); | |
4857 | ||
940c3c06 PA |
4858 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
4859 | { | |
4860 | /* Record the exit code in the convenience variable $_exitcode, so | |
4861 | that the user can inspect this again later. */ | |
4862 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
4863 | (LONGEST) ecs->ws.value.integer); | |
4864 | ||
4865 | /* Also record this in the inferior itself. */ | |
4866 | current_inferior ()->has_exit_code = 1; | |
4867 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 4868 | |
98eb56a4 PA |
4869 | /* Support the --return-child-result option. */ |
4870 | return_child_result_value = ecs->ws.value.integer; | |
4871 | ||
76727919 | 4872 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
4873 | } |
4874 | else | |
0c557179 | 4875 | { |
00431a78 | 4876 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
4877 | |
4878 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
4879 | { | |
4880 | /* Set the value of the internal variable $_exitsignal, | |
4881 | which holds the signal uncaught by the inferior. */ | |
4882 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
4883 | gdbarch_gdb_signal_to_target (gdbarch, | |
4884 | ecs->ws.value.sig)); | |
4885 | } | |
4886 | else | |
4887 | { | |
4888 | /* We don't have access to the target's method used for | |
4889 | converting between signal numbers (GDB's internal | |
4890 | representation <-> target's representation). | |
4891 | Therefore, we cannot do a good job at displaying this | |
4892 | information to the user. It's better to just warn | |
4893 | her about it (if infrun debugging is enabled), and | |
4894 | give up. */ | |
4895 | if (debug_infrun) | |
4896 | fprintf_filtered (gdb_stdlog, _("\ | |
4897 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
4898 | } | |
4899 | ||
76727919 | 4900 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 4901 | } |
8cf64490 | 4902 | |
488f131b | 4903 | gdb_flush (gdb_stdout); |
bc1e6c81 | 4904 | target_mourn_inferior (inferior_ptid); |
488f131b | 4905 | stop_print_frame = 0; |
22bcd14b | 4906 | stop_waiting (ecs); |
488f131b | 4907 | return; |
c5aa993b | 4908 | |
488f131b | 4909 | /* The following are the only cases in which we keep going; |
1777feb0 | 4910 | the above cases end in a continue or goto. */ |
488f131b | 4911 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 4912 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 4913 | if (debug_infrun) |
fed708ed PA |
4914 | { |
4915 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
4916 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); | |
4917 | else | |
4918 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n"); | |
4919 | } | |
c906108c | 4920 | |
e2d96639 YQ |
4921 | /* Check whether the inferior is displaced stepping. */ |
4922 | { | |
00431a78 | 4923 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 4924 | struct gdbarch *gdbarch = regcache->arch (); |
e2d96639 YQ |
4925 | |
4926 | /* If checking displaced stepping is supported, and thread | |
4927 | ecs->ptid is displaced stepping. */ | |
00431a78 | 4928 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 YQ |
4929 | { |
4930 | struct inferior *parent_inf | |
c9657e70 | 4931 | = find_inferior_ptid (ecs->ptid); |
e2d96639 YQ |
4932 | struct regcache *child_regcache; |
4933 | CORE_ADDR parent_pc; | |
4934 | ||
4935 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
4936 | indicating that the displaced stepping of syscall instruction | |
4937 | has been done. Perform cleanup for parent process here. Note | |
4938 | that this operation also cleans up the child process for vfork, | |
4939 | because their pages are shared. */ | |
00431a78 | 4940 | displaced_step_fixup (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
4941 | /* Start a new step-over in another thread if there's one |
4942 | that needs it. */ | |
4943 | start_step_over (); | |
e2d96639 YQ |
4944 | |
4945 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
4946 | { | |
c0987663 | 4947 | struct displaced_step_inferior_state *displaced |
00431a78 | 4948 | = get_displaced_stepping_state (parent_inf); |
c0987663 | 4949 | |
e2d96639 YQ |
4950 | /* Restore scratch pad for child process. */ |
4951 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
4952 | } | |
4953 | ||
4954 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
4955 | the child's PC is also within the scratchpad. Set the child's PC | |
4956 | to the parent's PC value, which has already been fixed up. | |
4957 | FIXME: we use the parent's aspace here, although we're touching | |
4958 | the child, because the child hasn't been added to the inferior | |
4959 | list yet at this point. */ | |
4960 | ||
4961 | child_regcache | |
4962 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
4963 | gdbarch, | |
4964 | parent_inf->aspace); | |
4965 | /* Read PC value of parent process. */ | |
4966 | parent_pc = regcache_read_pc (regcache); | |
4967 | ||
4968 | if (debug_displaced) | |
4969 | fprintf_unfiltered (gdb_stdlog, | |
4970 | "displaced: write child pc from %s to %s\n", | |
4971 | paddress (gdbarch, | |
4972 | regcache_read_pc (child_regcache)), | |
4973 | paddress (gdbarch, parent_pc)); | |
4974 | ||
4975 | regcache_write_pc (child_regcache, parent_pc); | |
4976 | } | |
4977 | } | |
4978 | ||
00431a78 | 4979 | context_switch (ecs); |
5a2901d9 | 4980 | |
b242c3c2 PA |
4981 | /* Immediately detach breakpoints from the child before there's |
4982 | any chance of letting the user delete breakpoints from the | |
4983 | breakpoint lists. If we don't do this early, it's easy to | |
4984 | leave left over traps in the child, vis: "break foo; catch | |
4985 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
4986 | the fork on the last `continue', and by that time the | |
4987 | breakpoint at "foo" is long gone from the breakpoint table. | |
4988 | If we vforked, then we don't need to unpatch here, since both | |
4989 | parent and child are sharing the same memory pages; we'll | |
4990 | need to unpatch at follow/detach time instead to be certain | |
4991 | that new breakpoints added between catchpoint hit time and | |
4992 | vfork follow are detached. */ | |
4993 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
4994 | { | |
b242c3c2 PA |
4995 | /* This won't actually modify the breakpoint list, but will |
4996 | physically remove the breakpoints from the child. */ | |
d80ee84f | 4997 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
4998 | } |
4999 | ||
34b7e8a6 | 5000 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5001 | |
e58b0e63 PA |
5002 | /* In case the event is caught by a catchpoint, remember that |
5003 | the event is to be followed at the next resume of the thread, | |
5004 | and not immediately. */ | |
5005 | ecs->event_thread->pending_follow = ecs->ws; | |
5006 | ||
f2ffa92b PA |
5007 | ecs->event_thread->suspend.stop_pc |
5008 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 5009 | |
16c381f0 | 5010 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5011 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5012 | ecs->event_thread->suspend.stop_pc, |
5013 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 5014 | |
c65d6b55 PA |
5015 | if (handle_stop_requested (ecs)) |
5016 | return; | |
5017 | ||
ce12b012 PA |
5018 | /* If no catchpoint triggered for this, then keep going. Note |
5019 | that we're interested in knowing the bpstat actually causes a | |
5020 | stop, not just if it may explain the signal. Software | |
5021 | watchpoints, for example, always appear in the bpstat. */ | |
5022 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5023 | { |
e58b0e63 | 5024 | int should_resume; |
3e43a32a MS |
5025 | int follow_child |
5026 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 5027 | |
a493e3e2 | 5028 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 PA |
5029 | |
5030 | should_resume = follow_fork (); | |
5031 | ||
00431a78 PA |
5032 | thread_info *parent = ecs->event_thread; |
5033 | thread_info *child = find_thread_ptid (ecs->ws.value.related_pid); | |
6c95b8df | 5034 | |
a2077e25 PA |
5035 | /* At this point, the parent is marked running, and the |
5036 | child is marked stopped. */ | |
5037 | ||
5038 | /* If not resuming the parent, mark it stopped. */ | |
5039 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5040 | parent->set_running (false); |
a2077e25 PA |
5041 | |
5042 | /* If resuming the child, mark it running. */ | |
5043 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5044 | child->set_running (true); |
a2077e25 | 5045 | |
6c95b8df | 5046 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5047 | if (!detach_fork && (non_stop |
5048 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5049 | { |
5050 | if (follow_child) | |
5051 | switch_to_thread (parent); | |
5052 | else | |
5053 | switch_to_thread (child); | |
5054 | ||
5055 | ecs->event_thread = inferior_thread (); | |
5056 | ecs->ptid = inferior_ptid; | |
5057 | keep_going (ecs); | |
5058 | } | |
5059 | ||
5060 | if (follow_child) | |
5061 | switch_to_thread (child); | |
5062 | else | |
5063 | switch_to_thread (parent); | |
5064 | ||
e58b0e63 PA |
5065 | ecs->event_thread = inferior_thread (); |
5066 | ecs->ptid = inferior_ptid; | |
5067 | ||
5068 | if (should_resume) | |
5069 | keep_going (ecs); | |
5070 | else | |
22bcd14b | 5071 | stop_waiting (ecs); |
04e68871 DJ |
5072 | return; |
5073 | } | |
94c57d6a PA |
5074 | process_event_stop_test (ecs); |
5075 | return; | |
488f131b | 5076 | |
6c95b8df PA |
5077 | case TARGET_WAITKIND_VFORK_DONE: |
5078 | /* Done with the shared memory region. Re-insert breakpoints in | |
5079 | the parent, and keep going. */ | |
5080 | ||
5081 | if (debug_infrun) | |
3e43a32a MS |
5082 | fprintf_unfiltered (gdb_stdlog, |
5083 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
6c95b8df | 5084 | |
00431a78 | 5085 | context_switch (ecs); |
6c95b8df PA |
5086 | |
5087 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5088 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5089 | |
5090 | if (handle_stop_requested (ecs)) | |
5091 | return; | |
5092 | ||
6c95b8df PA |
5093 | /* This also takes care of reinserting breakpoints in the |
5094 | previously locked inferior. */ | |
5095 | keep_going (ecs); | |
5096 | return; | |
5097 | ||
488f131b | 5098 | case TARGET_WAITKIND_EXECD: |
527159b7 | 5099 | if (debug_infrun) |
fc5261f2 | 5100 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 5101 | |
cbd2b4e3 PA |
5102 | /* Note we can't read registers yet (the stop_pc), because we |
5103 | don't yet know the inferior's post-exec architecture. | |
5104 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5105 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5106 | |
6c95b8df PA |
5107 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5108 | handle_vfork_child_exec_or_exit (1); | |
5109 | ||
795e548f PA |
5110 | /* This causes the eventpoints and symbol table to be reset. |
5111 | Must do this now, before trying to determine whether to | |
5112 | stop. */ | |
71b43ef8 | 5113 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5114 | |
17d8546e DB |
5115 | /* In follow_exec we may have deleted the original thread and |
5116 | created a new one. Make sure that the event thread is the | |
5117 | execd thread for that case (this is a nop otherwise). */ | |
5118 | ecs->event_thread = inferior_thread (); | |
5119 | ||
f2ffa92b PA |
5120 | ecs->event_thread->suspend.stop_pc |
5121 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5122 | |
16c381f0 | 5123 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5124 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5125 | ecs->event_thread->suspend.stop_pc, |
5126 | ecs->event_thread, &ecs->ws); | |
795e548f | 5127 | |
71b43ef8 PA |
5128 | /* Note that this may be referenced from inside |
5129 | bpstat_stop_status above, through inferior_has_execd. */ | |
5130 | xfree (ecs->ws.value.execd_pathname); | |
5131 | ecs->ws.value.execd_pathname = NULL; | |
5132 | ||
c65d6b55 PA |
5133 | if (handle_stop_requested (ecs)) |
5134 | return; | |
5135 | ||
04e68871 | 5136 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5137 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5138 | { |
a493e3e2 | 5139 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5140 | keep_going (ecs); |
5141 | return; | |
5142 | } | |
94c57d6a PA |
5143 | process_event_stop_test (ecs); |
5144 | return; | |
488f131b | 5145 | |
b4dc5ffa MK |
5146 | /* Be careful not to try to gather much state about a thread |
5147 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5148 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 5149 | if (debug_infrun) |
3e43a32a MS |
5150 | fprintf_unfiltered (gdb_stdlog, |
5151 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
1777feb0 | 5152 | /* Getting the current syscall number. */ |
94c57d6a PA |
5153 | if (handle_syscall_event (ecs) == 0) |
5154 | process_event_stop_test (ecs); | |
5155 | return; | |
c906108c | 5156 | |
488f131b JB |
5157 | /* Before examining the threads further, step this thread to |
5158 | get it entirely out of the syscall. (We get notice of the | |
5159 | event when the thread is just on the verge of exiting a | |
5160 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5161 | into user code.) */ |
488f131b | 5162 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 5163 | if (debug_infrun) |
3e43a32a MS |
5164 | fprintf_unfiltered (gdb_stdlog, |
5165 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
94c57d6a PA |
5166 | if (handle_syscall_event (ecs) == 0) |
5167 | process_event_stop_test (ecs); | |
5168 | return; | |
c906108c | 5169 | |
488f131b | 5170 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 5171 | if (debug_infrun) |
8a9de0e4 | 5172 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
4f5d7f63 PA |
5173 | handle_signal_stop (ecs); |
5174 | return; | |
c906108c | 5175 | |
b2175913 | 5176 | case TARGET_WAITKIND_NO_HISTORY: |
4b4e080e PA |
5177 | if (debug_infrun) |
5178 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
b2175913 | 5179 | /* Reverse execution: target ran out of history info. */ |
eab402df | 5180 | |
d1988021 | 5181 | /* Switch to the stopped thread. */ |
00431a78 | 5182 | context_switch (ecs); |
d1988021 MM |
5183 | if (debug_infrun) |
5184 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
5185 | ||
34b7e8a6 | 5186 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5187 | ecs->event_thread->suspend.stop_pc |
5188 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5189 | |
5190 | if (handle_stop_requested (ecs)) | |
5191 | return; | |
5192 | ||
76727919 | 5193 | gdb::observers::no_history.notify (); |
22bcd14b | 5194 | stop_waiting (ecs); |
b2175913 | 5195 | return; |
488f131b | 5196 | } |
4f5d7f63 PA |
5197 | } |
5198 | ||
0b6e5e10 JB |
5199 | /* A wrapper around handle_inferior_event_1, which also makes sure |
5200 | that all temporary struct value objects that were created during | |
5201 | the handling of the event get deleted at the end. */ | |
5202 | ||
5203 | static void | |
5204 | handle_inferior_event (struct execution_control_state *ecs) | |
5205 | { | |
5206 | struct value *mark = value_mark (); | |
5207 | ||
5208 | handle_inferior_event_1 (ecs); | |
5209 | /* Purge all temporary values created during the event handling, | |
5210 | as it could be a long time before we return to the command level | |
5211 | where such values would otherwise be purged. */ | |
5212 | value_free_to_mark (mark); | |
5213 | } | |
5214 | ||
372316f1 PA |
5215 | /* Restart threads back to what they were trying to do back when we |
5216 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5217 | ignored. */ | |
4d9d9d04 PA |
5218 | |
5219 | static void | |
372316f1 PA |
5220 | restart_threads (struct thread_info *event_thread) |
5221 | { | |
372316f1 PA |
5222 | /* In case the instruction just stepped spawned a new thread. */ |
5223 | update_thread_list (); | |
5224 | ||
08036331 | 5225 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 PA |
5226 | { |
5227 | if (tp == event_thread) | |
5228 | { | |
5229 | if (debug_infrun) | |
5230 | fprintf_unfiltered (gdb_stdlog, | |
5231 | "infrun: restart threads: " | |
5232 | "[%s] is event thread\n", | |
5233 | target_pid_to_str (tp->ptid)); | |
5234 | continue; | |
5235 | } | |
5236 | ||
5237 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5238 | { | |
5239 | if (debug_infrun) | |
5240 | fprintf_unfiltered (gdb_stdlog, | |
5241 | "infrun: restart threads: " | |
5242 | "[%s] not meant to be running\n", | |
5243 | target_pid_to_str (tp->ptid)); | |
5244 | continue; | |
5245 | } | |
5246 | ||
5247 | if (tp->resumed) | |
5248 | { | |
5249 | if (debug_infrun) | |
5250 | fprintf_unfiltered (gdb_stdlog, | |
5251 | "infrun: restart threads: [%s] resumed\n", | |
5252 | target_pid_to_str (tp->ptid)); | |
5253 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
5254 | continue; | |
5255 | } | |
5256 | ||
5257 | if (thread_is_in_step_over_chain (tp)) | |
5258 | { | |
5259 | if (debug_infrun) | |
5260 | fprintf_unfiltered (gdb_stdlog, | |
5261 | "infrun: restart threads: " | |
5262 | "[%s] needs step-over\n", | |
5263 | target_pid_to_str (tp->ptid)); | |
5264 | gdb_assert (!tp->resumed); | |
5265 | continue; | |
5266 | } | |
5267 | ||
5268 | ||
5269 | if (tp->suspend.waitstatus_pending_p) | |
5270 | { | |
5271 | if (debug_infrun) | |
5272 | fprintf_unfiltered (gdb_stdlog, | |
5273 | "infrun: restart threads: " | |
5274 | "[%s] has pending status\n", | |
5275 | target_pid_to_str (tp->ptid)); | |
5276 | tp->resumed = 1; | |
5277 | continue; | |
5278 | } | |
5279 | ||
c65d6b55 PA |
5280 | gdb_assert (!tp->stop_requested); |
5281 | ||
372316f1 PA |
5282 | /* If some thread needs to start a step-over at this point, it |
5283 | should still be in the step-over queue, and thus skipped | |
5284 | above. */ | |
5285 | if (thread_still_needs_step_over (tp)) | |
5286 | { | |
5287 | internal_error (__FILE__, __LINE__, | |
5288 | "thread [%s] needs a step-over, but not in " | |
5289 | "step-over queue\n", | |
5290 | target_pid_to_str (tp->ptid)); | |
5291 | } | |
5292 | ||
5293 | if (currently_stepping (tp)) | |
5294 | { | |
5295 | if (debug_infrun) | |
5296 | fprintf_unfiltered (gdb_stdlog, | |
5297 | "infrun: restart threads: [%s] was stepping\n", | |
5298 | target_pid_to_str (tp->ptid)); | |
5299 | keep_going_stepped_thread (tp); | |
5300 | } | |
5301 | else | |
5302 | { | |
5303 | struct execution_control_state ecss; | |
5304 | struct execution_control_state *ecs = &ecss; | |
5305 | ||
5306 | if (debug_infrun) | |
5307 | fprintf_unfiltered (gdb_stdlog, | |
5308 | "infrun: restart threads: [%s] continuing\n", | |
5309 | target_pid_to_str (tp->ptid)); | |
5310 | reset_ecs (ecs, tp); | |
00431a78 | 5311 | switch_to_thread (tp); |
372316f1 PA |
5312 | keep_going_pass_signal (ecs); |
5313 | } | |
5314 | } | |
5315 | } | |
5316 | ||
5317 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5318 | a pending waitstatus. */ | |
5319 | ||
5320 | static int | |
5321 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5322 | void *arg) | |
5323 | { | |
5324 | return (tp->resumed | |
5325 | && tp->suspend.waitstatus_pending_p); | |
5326 | } | |
5327 | ||
5328 | /* Called when we get an event that may finish an in-line or | |
5329 | out-of-line (displaced stepping) step-over started previously. | |
5330 | Return true if the event is processed and we should go back to the | |
5331 | event loop; false if the caller should continue processing the | |
5332 | event. */ | |
5333 | ||
5334 | static int | |
4d9d9d04 PA |
5335 | finish_step_over (struct execution_control_state *ecs) |
5336 | { | |
372316f1 PA |
5337 | int had_step_over_info; |
5338 | ||
00431a78 | 5339 | displaced_step_fixup (ecs->event_thread, |
4d9d9d04 PA |
5340 | ecs->event_thread->suspend.stop_signal); |
5341 | ||
372316f1 PA |
5342 | had_step_over_info = step_over_info_valid_p (); |
5343 | ||
5344 | if (had_step_over_info) | |
4d9d9d04 PA |
5345 | { |
5346 | /* If we're stepping over a breakpoint with all threads locked, | |
5347 | then only the thread that was stepped should be reporting | |
5348 | back an event. */ | |
5349 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5350 | ||
c65d6b55 | 5351 | clear_step_over_info (); |
4d9d9d04 PA |
5352 | } |
5353 | ||
fbea99ea | 5354 | if (!target_is_non_stop_p ()) |
372316f1 | 5355 | return 0; |
4d9d9d04 PA |
5356 | |
5357 | /* Start a new step-over in another thread if there's one that | |
5358 | needs it. */ | |
5359 | start_step_over (); | |
372316f1 PA |
5360 | |
5361 | /* If we were stepping over a breakpoint before, and haven't started | |
5362 | a new in-line step-over sequence, then restart all other threads | |
5363 | (except the event thread). We can't do this in all-stop, as then | |
5364 | e.g., we wouldn't be able to issue any other remote packet until | |
5365 | these other threads stop. */ | |
5366 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5367 | { | |
5368 | struct thread_info *pending; | |
5369 | ||
5370 | /* If we only have threads with pending statuses, the restart | |
5371 | below won't restart any thread and so nothing re-inserts the | |
5372 | breakpoint we just stepped over. But we need it inserted | |
5373 | when we later process the pending events, otherwise if | |
5374 | another thread has a pending event for this breakpoint too, | |
5375 | we'd discard its event (because the breakpoint that | |
5376 | originally caused the event was no longer inserted). */ | |
00431a78 | 5377 | context_switch (ecs); |
372316f1 PA |
5378 | insert_breakpoints (); |
5379 | ||
5380 | restart_threads (ecs->event_thread); | |
5381 | ||
5382 | /* If we have events pending, go through handle_inferior_event | |
5383 | again, picking up a pending event at random. This avoids | |
5384 | thread starvation. */ | |
5385 | ||
5386 | /* But not if we just stepped over a watchpoint in order to let | |
5387 | the instruction execute so we can evaluate its expression. | |
5388 | The set of watchpoints that triggered is recorded in the | |
5389 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5390 | If we processed another event first, that other event could | |
5391 | clobber this info. */ | |
5392 | if (ecs->event_thread->stepping_over_watchpoint) | |
5393 | return 0; | |
5394 | ||
5395 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5396 | NULL); | |
5397 | if (pending != NULL) | |
5398 | { | |
5399 | struct thread_info *tp = ecs->event_thread; | |
5400 | struct regcache *regcache; | |
5401 | ||
5402 | if (debug_infrun) | |
5403 | { | |
5404 | fprintf_unfiltered (gdb_stdlog, | |
5405 | "infrun: found resumed threads with " | |
5406 | "pending events, saving status\n"); | |
5407 | } | |
5408 | ||
5409 | gdb_assert (pending != tp); | |
5410 | ||
5411 | /* Record the event thread's event for later. */ | |
5412 | save_waitstatus (tp, &ecs->ws); | |
5413 | /* This was cleared early, by handle_inferior_event. Set it | |
5414 | so this pending event is considered by | |
5415 | do_target_wait. */ | |
5416 | tp->resumed = 1; | |
5417 | ||
5418 | gdb_assert (!tp->executing); | |
5419 | ||
00431a78 | 5420 | regcache = get_thread_regcache (tp); |
372316f1 PA |
5421 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
5422 | ||
5423 | if (debug_infrun) | |
5424 | { | |
5425 | fprintf_unfiltered (gdb_stdlog, | |
5426 | "infrun: saved stop_pc=%s for %s " | |
5427 | "(currently_stepping=%d)\n", | |
5428 | paddress (target_gdbarch (), | |
5429 | tp->suspend.stop_pc), | |
5430 | target_pid_to_str (tp->ptid), | |
5431 | currently_stepping (tp)); | |
5432 | } | |
5433 | ||
5434 | /* This in-line step-over finished; clear this so we won't | |
5435 | start a new one. This is what handle_signal_stop would | |
5436 | do, if we returned false. */ | |
5437 | tp->stepping_over_breakpoint = 0; | |
5438 | ||
5439 | /* Wake up the event loop again. */ | |
5440 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5441 | ||
5442 | prepare_to_wait (ecs); | |
5443 | return 1; | |
5444 | } | |
5445 | } | |
5446 | ||
5447 | return 0; | |
4d9d9d04 PA |
5448 | } |
5449 | ||
4f5d7f63 PA |
5450 | /* Come here when the program has stopped with a signal. */ |
5451 | ||
5452 | static void | |
5453 | handle_signal_stop (struct execution_control_state *ecs) | |
5454 | { | |
5455 | struct frame_info *frame; | |
5456 | struct gdbarch *gdbarch; | |
5457 | int stopped_by_watchpoint; | |
5458 | enum stop_kind stop_soon; | |
5459 | int random_signal; | |
c906108c | 5460 | |
f0407826 DE |
5461 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5462 | ||
c65d6b55 PA |
5463 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5464 | ||
f0407826 DE |
5465 | /* Do we need to clean up the state of a thread that has |
5466 | completed a displaced single-step? (Doing so usually affects | |
5467 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5468 | if (finish_step_over (ecs)) |
5469 | return; | |
f0407826 DE |
5470 | |
5471 | /* If we either finished a single-step or hit a breakpoint, but | |
5472 | the user wanted this thread to be stopped, pretend we got a | |
5473 | SIG0 (generic unsignaled stop). */ | |
5474 | if (ecs->event_thread->stop_requested | |
5475 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5476 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5477 | |
f2ffa92b PA |
5478 | ecs->event_thread->suspend.stop_pc |
5479 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 5480 | |
527159b7 | 5481 | if (debug_infrun) |
237fc4c9 | 5482 | { |
00431a78 | 5483 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 5484 | struct gdbarch *reg_gdbarch = regcache->arch (); |
2989a365 | 5485 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
7f82dfc7 JK |
5486 | |
5487 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
5488 | |
5489 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
b926417a | 5490 | paddress (reg_gdbarch, |
f2ffa92b | 5491 | ecs->event_thread->suspend.stop_pc)); |
d92524f1 | 5492 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5493 | { |
5494 | CORE_ADDR addr; | |
abbb1732 | 5495 | |
237fc4c9 PA |
5496 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
5497 | ||
8b88a78e | 5498 | if (target_stopped_data_address (current_top_target (), &addr)) |
237fc4c9 | 5499 | fprintf_unfiltered (gdb_stdlog, |
5af949e3 | 5500 | "infrun: stopped data address = %s\n", |
b926417a | 5501 | paddress (reg_gdbarch, addr)); |
237fc4c9 PA |
5502 | else |
5503 | fprintf_unfiltered (gdb_stdlog, | |
5504 | "infrun: (no data address available)\n"); | |
5505 | } | |
5506 | } | |
527159b7 | 5507 | |
36fa8042 PA |
5508 | /* This is originated from start_remote(), start_inferior() and |
5509 | shared libraries hook functions. */ | |
00431a78 | 5510 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
5511 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
5512 | { | |
00431a78 | 5513 | context_switch (ecs); |
36fa8042 PA |
5514 | if (debug_infrun) |
5515 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
5516 | stop_print_frame = 1; | |
22bcd14b | 5517 | stop_waiting (ecs); |
36fa8042 PA |
5518 | return; |
5519 | } | |
5520 | ||
36fa8042 PA |
5521 | /* This originates from attach_command(). We need to overwrite |
5522 | the stop_signal here, because some kernels don't ignore a | |
5523 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5524 | See more comments in inferior.h. On the other hand, if we | |
5525 | get a non-SIGSTOP, report it to the user - assume the backend | |
5526 | will handle the SIGSTOP if it should show up later. | |
5527 | ||
5528 | Also consider that the attach is complete when we see a | |
5529 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5530 | target extended-remote report it instead of a SIGSTOP | |
5531 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5532 | signal, so this is no exception. | |
5533 | ||
5534 | Also consider that the attach is complete when we see a | |
5535 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5536 | the target to stop all threads of the inferior, in case the | |
5537 | low level attach operation doesn't stop them implicitly. If | |
5538 | they weren't stopped implicitly, then the stub will report a | |
5539 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5540 | other than GDB's request. */ | |
5541 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5542 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5543 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5544 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5545 | { | |
5546 | stop_print_frame = 1; | |
22bcd14b | 5547 | stop_waiting (ecs); |
36fa8042 PA |
5548 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5549 | return; | |
5550 | } | |
5551 | ||
488f131b | 5552 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 | 5553 | so, then switch to that thread. */ |
d7e15655 | 5554 | if (ecs->ptid != inferior_ptid) |
488f131b | 5555 | { |
527159b7 | 5556 | if (debug_infrun) |
8a9de0e4 | 5557 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 5558 | |
00431a78 | 5559 | context_switch (ecs); |
c5aa993b | 5560 | |
9a4105ab | 5561 | if (deprecated_context_hook) |
00431a78 | 5562 | deprecated_context_hook (ecs->event_thread->global_num); |
488f131b | 5563 | } |
c906108c | 5564 | |
568d6575 UW |
5565 | /* At this point, get hold of the now-current thread's frame. */ |
5566 | frame = get_current_frame (); | |
5567 | gdbarch = get_frame_arch (frame); | |
5568 | ||
2adfaa28 | 5569 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5570 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5571 | { |
af48d08f | 5572 | struct regcache *regcache; |
af48d08f | 5573 | CORE_ADDR pc; |
2adfaa28 | 5574 | |
00431a78 | 5575 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
5576 | const address_space *aspace = regcache->aspace (); |
5577 | ||
af48d08f | 5578 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 5579 | |
af48d08f PA |
5580 | /* However, before doing so, if this single-step breakpoint was |
5581 | actually for another thread, set this thread up for moving | |
5582 | past it. */ | |
5583 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5584 | aspace, pc)) | |
5585 | { | |
5586 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
5587 | { |
5588 | if (debug_infrun) | |
5589 | { | |
5590 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 5591 | "infrun: [%s] hit another thread's " |
34b7e8a6 PA |
5592 | "single-step breakpoint\n", |
5593 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 | 5594 | } |
af48d08f PA |
5595 | ecs->hit_singlestep_breakpoint = 1; |
5596 | } | |
5597 | } | |
5598 | else | |
5599 | { | |
5600 | if (debug_infrun) | |
5601 | { | |
5602 | fprintf_unfiltered (gdb_stdlog, | |
5603 | "infrun: [%s] hit its " | |
5604 | "single-step breakpoint\n", | |
5605 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 PA |
5606 | } |
5607 | } | |
488f131b | 5608 | } |
af48d08f | 5609 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5610 | |
963f9c80 PA |
5611 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5612 | && ecs->event_thread->control.trap_expected | |
5613 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5614 | stopped_by_watchpoint = 0; |
5615 | else | |
5616 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5617 | ||
5618 | /* If necessary, step over this watchpoint. We'll be back to display | |
5619 | it in a moment. */ | |
5620 | if (stopped_by_watchpoint | |
d92524f1 | 5621 | && (target_have_steppable_watchpoint |
568d6575 | 5622 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5623 | { |
488f131b JB |
5624 | /* At this point, we are stopped at an instruction which has |
5625 | attempted to write to a piece of memory under control of | |
5626 | a watchpoint. The instruction hasn't actually executed | |
5627 | yet. If we were to evaluate the watchpoint expression | |
5628 | now, we would get the old value, and therefore no change | |
5629 | would seem to have occurred. | |
5630 | ||
5631 | In order to make watchpoints work `right', we really need | |
5632 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5633 | watchpoint expression. We do this by single-stepping the |
5634 | target. | |
5635 | ||
7f89fd65 | 5636 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5637 | it. For example, the PA can (with some kernel cooperation) |
5638 | single step over a watchpoint without disabling the watchpoint. | |
5639 | ||
5640 | It is far more common to need to disable a watchpoint to step | |
5641 | the inferior over it. If we have non-steppable watchpoints, | |
5642 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5643 | disable all watchpoints. |
5644 | ||
5645 | Any breakpoint at PC must also be stepped over -- if there's | |
5646 | one, it will have already triggered before the watchpoint | |
5647 | triggered, and we either already reported it to the user, or | |
5648 | it didn't cause a stop and we called keep_going. In either | |
5649 | case, if there was a breakpoint at PC, we must be trying to | |
5650 | step past it. */ | |
5651 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5652 | keep_going (ecs); | |
488f131b JB |
5653 | return; |
5654 | } | |
5655 | ||
4e1c45ea | 5656 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5657 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5658 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5659 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5660 | stop_print_frame = 1; |
488f131b | 5661 | stopped_by_random_signal = 0; |
ddfe970e | 5662 | bpstat stop_chain = NULL; |
488f131b | 5663 | |
edb3359d DJ |
5664 | /* Hide inlined functions starting here, unless we just performed stepi or |
5665 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5666 | inline function call sites). */ | |
16c381f0 | 5667 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 5668 | { |
00431a78 PA |
5669 | const address_space *aspace |
5670 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
5671 | |
5672 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5673 | determine that the address is one where functions cannot have | |
5674 | been inlined. This improves performance with inferiors that | |
5675 | load a lot of shared libraries, because the solib event | |
5676 | breakpoint is defined as the address of a function (i.e. not | |
5677 | inline). Note that we have to check the previous PC as well | |
5678 | as the current one to catch cases when we have just | |
5679 | single-stepped off a breakpoint prior to reinstating it. | |
5680 | Note that we're assuming that the code we single-step to is | |
5681 | not inline, but that's not definitive: there's nothing | |
5682 | preventing the event breakpoint function from containing | |
5683 | inlined code, and the single-step ending up there. If the | |
5684 | user had set a breakpoint on that inlined code, the missing | |
5685 | skip_inline_frames call would break things. Fortunately | |
5686 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
5687 | if (!pc_at_non_inline_function (aspace, |
5688 | ecs->event_thread->suspend.stop_pc, | |
5689 | &ecs->ws) | |
a210c238 MR |
5690 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5691 | && ecs->event_thread->control.trap_expected | |
5692 | && pc_at_non_inline_function (aspace, | |
5693 | ecs->event_thread->prev_pc, | |
09ac7c10 | 5694 | &ecs->ws))) |
1c5a993e | 5695 | { |
f2ffa92b PA |
5696 | stop_chain = build_bpstat_chain (aspace, |
5697 | ecs->event_thread->suspend.stop_pc, | |
5698 | &ecs->ws); | |
00431a78 | 5699 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
5700 | |
5701 | /* Re-fetch current thread's frame in case that invalidated | |
5702 | the frame cache. */ | |
5703 | frame = get_current_frame (); | |
5704 | gdbarch = get_frame_arch (frame); | |
5705 | } | |
0574c78f | 5706 | } |
edb3359d | 5707 | |
a493e3e2 | 5708 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 5709 | && ecs->event_thread->control.trap_expected |
568d6575 | 5710 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 5711 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 5712 | { |
b50d7442 | 5713 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 5714 | also on an instruction that needs to be stepped multiple |
1777feb0 | 5715 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
5716 | with a delay slot. It needs to be stepped twice, once for |
5717 | the instruction and once for the delay slot. */ | |
5718 | int step_through_delay | |
568d6575 | 5719 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 5720 | |
527159b7 | 5721 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 5722 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
5723 | if (ecs->event_thread->control.step_range_end == 0 |
5724 | && step_through_delay) | |
3352ef37 AC |
5725 | { |
5726 | /* The user issued a continue when stopped at a breakpoint. | |
5727 | Set up for another trap and get out of here. */ | |
4e1c45ea | 5728 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5729 | keep_going (ecs); |
5730 | return; | |
5731 | } | |
5732 | else if (step_through_delay) | |
5733 | { | |
5734 | /* The user issued a step when stopped at a breakpoint. | |
5735 | Maybe we should stop, maybe we should not - the delay | |
5736 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
5737 | case, don't decide that here, just set |
5738 | ecs->stepping_over_breakpoint, making sure we | |
5739 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 5740 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5741 | } |
5742 | } | |
5743 | ||
ab04a2af TT |
5744 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
5745 | handles this event. */ | |
5746 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 5747 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5748 | ecs->event_thread->suspend.stop_pc, |
5749 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 5750 | |
ab04a2af TT |
5751 | /* Following in case break condition called a |
5752 | function. */ | |
5753 | stop_print_frame = 1; | |
73dd234f | 5754 | |
ab04a2af TT |
5755 | /* This is where we handle "moribund" watchpoints. Unlike |
5756 | software breakpoints traps, hardware watchpoint traps are | |
5757 | always distinguishable from random traps. If no high-level | |
5758 | watchpoint is associated with the reported stop data address | |
5759 | anymore, then the bpstat does not explain the signal --- | |
5760 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
5761 | set. */ | |
5762 | ||
5763 | if (debug_infrun | |
5764 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 5765 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 5766 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
5767 | && stopped_by_watchpoint) |
5768 | fprintf_unfiltered (gdb_stdlog, | |
5769 | "infrun: no user watchpoint explains " | |
5770 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 5771 | |
bac7d97b | 5772 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
5773 | at one stage in the past included checks for an inferior |
5774 | function call's call dummy's return breakpoint. The original | |
5775 | comment, that went with the test, read: | |
03cebad2 | 5776 | |
ab04a2af TT |
5777 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
5778 | another signal besides SIGTRAP, so check here as well as | |
5779 | above.'' | |
73dd234f | 5780 | |
ab04a2af TT |
5781 | If someone ever tries to get call dummys on a |
5782 | non-executable stack to work (where the target would stop | |
5783 | with something like a SIGSEGV), then those tests might need | |
5784 | to be re-instated. Given, however, that the tests were only | |
5785 | enabled when momentary breakpoints were not being used, I | |
5786 | suspect that it won't be the case. | |
488f131b | 5787 | |
ab04a2af TT |
5788 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
5789 | be necessary for call dummies on a non-executable stack on | |
5790 | SPARC. */ | |
488f131b | 5791 | |
bac7d97b | 5792 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
5793 | random_signal |
5794 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
5795 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 5796 | |
1cf4d951 PA |
5797 | /* Maybe this was a trap for a software breakpoint that has since |
5798 | been removed. */ | |
5799 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
5800 | { | |
f2ffa92b PA |
5801 | if (program_breakpoint_here_p (gdbarch, |
5802 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
5803 | { |
5804 | struct regcache *regcache; | |
5805 | int decr_pc; | |
5806 | ||
5807 | /* Re-adjust PC to what the program would see if GDB was not | |
5808 | debugging it. */ | |
00431a78 | 5809 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 5810 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
5811 | if (decr_pc != 0) |
5812 | { | |
07036511 TT |
5813 | gdb::optional<scoped_restore_tmpl<int>> |
5814 | restore_operation_disable; | |
1cf4d951 PA |
5815 | |
5816 | if (record_full_is_used ()) | |
07036511 TT |
5817 | restore_operation_disable.emplace |
5818 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 5819 | |
f2ffa92b PA |
5820 | regcache_write_pc (regcache, |
5821 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
5822 | } |
5823 | } | |
5824 | else | |
5825 | { | |
5826 | /* A delayed software breakpoint event. Ignore the trap. */ | |
5827 | if (debug_infrun) | |
5828 | fprintf_unfiltered (gdb_stdlog, | |
5829 | "infrun: delayed software breakpoint " | |
5830 | "trap, ignoring\n"); | |
5831 | random_signal = 0; | |
5832 | } | |
5833 | } | |
5834 | ||
5835 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
5836 | has since been removed. */ | |
5837 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
5838 | { | |
5839 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
5840 | if (debug_infrun) | |
5841 | fprintf_unfiltered (gdb_stdlog, | |
5842 | "infrun: delayed hardware breakpoint/watchpoint " | |
5843 | "trap, ignoring\n"); | |
5844 | random_signal = 0; | |
5845 | } | |
5846 | ||
bac7d97b PA |
5847 | /* If not, perhaps stepping/nexting can. */ |
5848 | if (random_signal) | |
5849 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5850 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 5851 | |
2adfaa28 PA |
5852 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
5853 | thread. Single-step breakpoints are transparent to the | |
5854 | breakpoints module. */ | |
5855 | if (random_signal) | |
5856 | random_signal = !ecs->hit_singlestep_breakpoint; | |
5857 | ||
bac7d97b PA |
5858 | /* No? Perhaps we got a moribund watchpoint. */ |
5859 | if (random_signal) | |
5860 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 5861 | |
c65d6b55 PA |
5862 | /* Always stop if the user explicitly requested this thread to |
5863 | remain stopped. */ | |
5864 | if (ecs->event_thread->stop_requested) | |
5865 | { | |
5866 | random_signal = 1; | |
5867 | if (debug_infrun) | |
5868 | fprintf_unfiltered (gdb_stdlog, "infrun: user-requested stop\n"); | |
5869 | } | |
5870 | ||
488f131b JB |
5871 | /* For the program's own signals, act according to |
5872 | the signal handling tables. */ | |
5873 | ||
ce12b012 | 5874 | if (random_signal) |
488f131b JB |
5875 | { |
5876 | /* Signal not for debugging purposes. */ | |
c9657e70 | 5877 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
c9737c08 | 5878 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 5879 | |
527159b7 | 5880 | if (debug_infrun) |
c9737c08 PA |
5881 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
5882 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 5883 | |
488f131b JB |
5884 | stopped_by_random_signal = 1; |
5885 | ||
252fbfc8 PA |
5886 | /* Always stop on signals if we're either just gaining control |
5887 | of the program, or the user explicitly requested this thread | |
5888 | to remain stopped. */ | |
d6b48e9c | 5889 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 5890 | || ecs->event_thread->stop_requested |
24291992 | 5891 | || (!inf->detaching |
16c381f0 | 5892 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 5893 | { |
22bcd14b | 5894 | stop_waiting (ecs); |
488f131b JB |
5895 | return; |
5896 | } | |
b57bacec PA |
5897 | |
5898 | /* Notify observers the signal has "handle print" set. Note we | |
5899 | returned early above if stopping; normal_stop handles the | |
5900 | printing in that case. */ | |
5901 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
5902 | { | |
5903 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 5904 | target_terminal::ours_for_output (); |
76727919 | 5905 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 5906 | target_terminal::inferior (); |
b57bacec | 5907 | } |
488f131b JB |
5908 | |
5909 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 5910 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 5911 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 5912 | |
f2ffa92b | 5913 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 5914 | && ecs->event_thread->control.trap_expected |
8358c15c | 5915 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
5916 | { |
5917 | /* We were just starting a new sequence, attempting to | |
5918 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 5919 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
5920 | of the stepping range so GDB needs to remember to, when |
5921 | the signal handler returns, resume stepping off that | |
5922 | breakpoint. */ | |
5923 | /* To simplify things, "continue" is forced to use the same | |
5924 | code paths as single-step - set a breakpoint at the | |
5925 | signal return address and then, once hit, step off that | |
5926 | breakpoint. */ | |
237fc4c9 PA |
5927 | if (debug_infrun) |
5928 | fprintf_unfiltered (gdb_stdlog, | |
5929 | "infrun: signal arrived while stepping over " | |
5930 | "breakpoint\n"); | |
d3169d93 | 5931 | |
2c03e5be | 5932 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 5933 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
5934 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
5935 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
5936 | |
5937 | /* If we were nexting/stepping some other thread, switch to | |
5938 | it, so that we don't continue it, losing control. */ | |
5939 | if (!switch_back_to_stepped_thread (ecs)) | |
5940 | keep_going (ecs); | |
9d799f85 | 5941 | return; |
68f53502 | 5942 | } |
9d799f85 | 5943 | |
e5f8a7cc | 5944 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
5945 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
5946 | ecs->event_thread) | |
e5f8a7cc | 5947 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 5948 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 5949 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 5950 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
5951 | { |
5952 | /* The inferior is about to take a signal that will take it | |
5953 | out of the single step range. Set a breakpoint at the | |
5954 | current PC (which is presumably where the signal handler | |
5955 | will eventually return) and then allow the inferior to | |
5956 | run free. | |
5957 | ||
5958 | Note that this is only needed for a signal delivered | |
5959 | while in the single-step range. Nested signals aren't a | |
5960 | problem as they eventually all return. */ | |
237fc4c9 PA |
5961 | if (debug_infrun) |
5962 | fprintf_unfiltered (gdb_stdlog, | |
5963 | "infrun: signal may take us out of " | |
5964 | "single-step range\n"); | |
5965 | ||
372316f1 | 5966 | clear_step_over_info (); |
2c03e5be | 5967 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 5968 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
5969 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
5970 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
5971 | keep_going (ecs); |
5972 | return; | |
d303a6c7 | 5973 | } |
9d799f85 AC |
5974 | |
5975 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
5976 | when either there's a nested signal, or when there's a | |
5977 | pending signal enabled just as the signal handler returns | |
5978 | (leaving the inferior at the step-resume-breakpoint without | |
5979 | actually executing it). Either way continue until the | |
5980 | breakpoint is really hit. */ | |
c447ac0b PA |
5981 | |
5982 | if (!switch_back_to_stepped_thread (ecs)) | |
5983 | { | |
5984 | if (debug_infrun) | |
5985 | fprintf_unfiltered (gdb_stdlog, | |
5986 | "infrun: random signal, keep going\n"); | |
5987 | ||
5988 | keep_going (ecs); | |
5989 | } | |
5990 | return; | |
488f131b | 5991 | } |
94c57d6a PA |
5992 | |
5993 | process_event_stop_test (ecs); | |
5994 | } | |
5995 | ||
5996 | /* Come here when we've got some debug event / signal we can explain | |
5997 | (IOW, not a random signal), and test whether it should cause a | |
5998 | stop, or whether we should resume the inferior (transparently). | |
5999 | E.g., could be a breakpoint whose condition evaluates false; we | |
6000 | could be still stepping within the line; etc. */ | |
6001 | ||
6002 | static void | |
6003 | process_event_stop_test (struct execution_control_state *ecs) | |
6004 | { | |
6005 | struct symtab_and_line stop_pc_sal; | |
6006 | struct frame_info *frame; | |
6007 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6008 | CORE_ADDR jmp_buf_pc; |
6009 | struct bpstat_what what; | |
94c57d6a | 6010 | |
cdaa5b73 | 6011 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6012 | |
cdaa5b73 PA |
6013 | frame = get_current_frame (); |
6014 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6015 | |
cdaa5b73 | 6016 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6017 | |
cdaa5b73 PA |
6018 | if (what.call_dummy) |
6019 | { | |
6020 | stop_stack_dummy = what.call_dummy; | |
6021 | } | |
186c406b | 6022 | |
243a9253 PA |
6023 | /* A few breakpoint types have callbacks associated (e.g., |
6024 | bp_jit_event). Run them now. */ | |
6025 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6026 | ||
cdaa5b73 PA |
6027 | /* If we hit an internal event that triggers symbol changes, the |
6028 | current frame will be invalidated within bpstat_what (e.g., if we | |
6029 | hit an internal solib event). Re-fetch it. */ | |
6030 | frame = get_current_frame (); | |
6031 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6032 | |
cdaa5b73 PA |
6033 | switch (what.main_action) |
6034 | { | |
6035 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6036 | /* If we hit the breakpoint at longjmp while stepping, we | |
6037 | install a momentary breakpoint at the target of the | |
6038 | jmp_buf. */ | |
186c406b | 6039 | |
cdaa5b73 PA |
6040 | if (debug_infrun) |
6041 | fprintf_unfiltered (gdb_stdlog, | |
6042 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 6043 | |
cdaa5b73 | 6044 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6045 | |
cdaa5b73 PA |
6046 | if (what.is_longjmp) |
6047 | { | |
6048 | struct value *arg_value; | |
6049 | ||
6050 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6051 | then use it to extract the arguments. The destination PC | |
6052 | is the third argument to the probe. */ | |
6053 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6054 | if (arg_value) | |
8fa0c4f8 AA |
6055 | { |
6056 | jmp_buf_pc = value_as_address (arg_value); | |
6057 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6058 | } | |
cdaa5b73 PA |
6059 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6060 | || !gdbarch_get_longjmp_target (gdbarch, | |
6061 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6062 | { |
cdaa5b73 PA |
6063 | if (debug_infrun) |
6064 | fprintf_unfiltered (gdb_stdlog, | |
6065 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
6066 | "(!gdbarch_get_longjmp_target)\n"); | |
6067 | keep_going (ecs); | |
6068 | return; | |
e2e4d78b | 6069 | } |
e2e4d78b | 6070 | |
cdaa5b73 PA |
6071 | /* Insert a breakpoint at resume address. */ |
6072 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6073 | } | |
6074 | else | |
6075 | check_exception_resume (ecs, frame); | |
6076 | keep_going (ecs); | |
6077 | return; | |
e81a37f7 | 6078 | |
cdaa5b73 PA |
6079 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6080 | { | |
6081 | struct frame_info *init_frame; | |
e81a37f7 | 6082 | |
cdaa5b73 | 6083 | /* There are several cases to consider. |
c906108c | 6084 | |
cdaa5b73 PA |
6085 | 1. The initiating frame no longer exists. In this case we |
6086 | must stop, because the exception or longjmp has gone too | |
6087 | far. | |
2c03e5be | 6088 | |
cdaa5b73 PA |
6089 | 2. The initiating frame exists, and is the same as the |
6090 | current frame. We stop, because the exception or longjmp | |
6091 | has been caught. | |
2c03e5be | 6092 | |
cdaa5b73 PA |
6093 | 3. The initiating frame exists and is different from the |
6094 | current frame. This means the exception or longjmp has | |
6095 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6096 | |
cdaa5b73 PA |
6097 | 4. longjmp breakpoint has been placed just to protect |
6098 | against stale dummy frames and user is not interested in | |
6099 | stopping around longjmps. */ | |
c5aa993b | 6100 | |
cdaa5b73 PA |
6101 | if (debug_infrun) |
6102 | fprintf_unfiltered (gdb_stdlog, | |
6103 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 6104 | |
cdaa5b73 PA |
6105 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6106 | != NULL); | |
6107 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6108 | |
cdaa5b73 PA |
6109 | if (what.is_longjmp) |
6110 | { | |
b67a2c6f | 6111 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6112 | |
cdaa5b73 | 6113 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6114 | { |
cdaa5b73 PA |
6115 | /* Case 4. */ |
6116 | keep_going (ecs); | |
6117 | return; | |
e5ef252a | 6118 | } |
cdaa5b73 | 6119 | } |
c5aa993b | 6120 | |
cdaa5b73 | 6121 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6122 | |
cdaa5b73 PA |
6123 | if (init_frame) |
6124 | { | |
6125 | struct frame_id current_id | |
6126 | = get_frame_id (get_current_frame ()); | |
6127 | if (frame_id_eq (current_id, | |
6128 | ecs->event_thread->initiating_frame)) | |
6129 | { | |
6130 | /* Case 2. Fall through. */ | |
6131 | } | |
6132 | else | |
6133 | { | |
6134 | /* Case 3. */ | |
6135 | keep_going (ecs); | |
6136 | return; | |
6137 | } | |
68f53502 | 6138 | } |
488f131b | 6139 | |
cdaa5b73 PA |
6140 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6141 | exists. */ | |
6142 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6143 | |
bdc36728 | 6144 | end_stepping_range (ecs); |
cdaa5b73 PA |
6145 | } |
6146 | return; | |
e5ef252a | 6147 | |
cdaa5b73 PA |
6148 | case BPSTAT_WHAT_SINGLE: |
6149 | if (debug_infrun) | |
6150 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
6151 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6152 | /* Still need to check other stuff, at least the case where we | |
6153 | are stepping and step out of the right range. */ | |
6154 | break; | |
e5ef252a | 6155 | |
cdaa5b73 PA |
6156 | case BPSTAT_WHAT_STEP_RESUME: |
6157 | if (debug_infrun) | |
6158 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 6159 | |
cdaa5b73 PA |
6160 | delete_step_resume_breakpoint (ecs->event_thread); |
6161 | if (ecs->event_thread->control.proceed_to_finish | |
6162 | && execution_direction == EXEC_REVERSE) | |
6163 | { | |
6164 | struct thread_info *tp = ecs->event_thread; | |
6165 | ||
6166 | /* We are finishing a function in reverse, and just hit the | |
6167 | step-resume breakpoint at the start address of the | |
6168 | function, and we're almost there -- just need to back up | |
6169 | by one more single-step, which should take us back to the | |
6170 | function call. */ | |
6171 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6172 | keep_going (ecs); | |
e5ef252a | 6173 | return; |
cdaa5b73 PA |
6174 | } |
6175 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6176 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6177 | && execution_direction == EXEC_REVERSE) |
6178 | { | |
6179 | /* We are stepping over a function call in reverse, and just | |
6180 | hit the step-resume breakpoint at the start address of | |
6181 | the function. Go back to single-stepping, which should | |
6182 | take us back to the function call. */ | |
6183 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6184 | keep_going (ecs); | |
6185 | return; | |
6186 | } | |
6187 | break; | |
e5ef252a | 6188 | |
cdaa5b73 PA |
6189 | case BPSTAT_WHAT_STOP_NOISY: |
6190 | if (debug_infrun) | |
6191 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
6192 | stop_print_frame = 1; | |
e5ef252a | 6193 | |
99619bea PA |
6194 | /* Assume the thread stopped for a breapoint. We'll still check |
6195 | whether a/the breakpoint is there when the thread is next | |
6196 | resumed. */ | |
6197 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6198 | |
22bcd14b | 6199 | stop_waiting (ecs); |
cdaa5b73 | 6200 | return; |
e5ef252a | 6201 | |
cdaa5b73 PA |
6202 | case BPSTAT_WHAT_STOP_SILENT: |
6203 | if (debug_infrun) | |
6204 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
6205 | stop_print_frame = 0; | |
e5ef252a | 6206 | |
99619bea PA |
6207 | /* Assume the thread stopped for a breapoint. We'll still check |
6208 | whether a/the breakpoint is there when the thread is next | |
6209 | resumed. */ | |
6210 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6211 | stop_waiting (ecs); |
cdaa5b73 PA |
6212 | return; |
6213 | ||
6214 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
6215 | if (debug_infrun) | |
6216 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
6217 | ||
6218 | delete_step_resume_breakpoint (ecs->event_thread); | |
6219 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6220 | { | |
6221 | /* Back when the step-resume breakpoint was inserted, we | |
6222 | were trying to single-step off a breakpoint. Go back to | |
6223 | doing that. */ | |
6224 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6225 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6226 | keep_going (ecs); | |
6227 | return; | |
e5ef252a | 6228 | } |
cdaa5b73 PA |
6229 | break; |
6230 | ||
6231 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6232 | break; | |
e5ef252a | 6233 | } |
c906108c | 6234 | |
af48d08f PA |
6235 | /* If we stepped a permanent breakpoint and we had a high priority |
6236 | step-resume breakpoint for the address we stepped, but we didn't | |
6237 | hit it, then we must have stepped into the signal handler. The | |
6238 | step-resume was only necessary to catch the case of _not_ | |
6239 | stepping into the handler, so delete it, and fall through to | |
6240 | checking whether the step finished. */ | |
6241 | if (ecs->event_thread->stepped_breakpoint) | |
6242 | { | |
6243 | struct breakpoint *sr_bp | |
6244 | = ecs->event_thread->control.step_resume_breakpoint; | |
6245 | ||
8d707a12 PA |
6246 | if (sr_bp != NULL |
6247 | && sr_bp->loc->permanent | |
af48d08f PA |
6248 | && sr_bp->type == bp_hp_step_resume |
6249 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6250 | { | |
6251 | if (debug_infrun) | |
6252 | fprintf_unfiltered (gdb_stdlog, | |
6253 | "infrun: stepped permanent breakpoint, stopped in " | |
6254 | "handler\n"); | |
6255 | delete_step_resume_breakpoint (ecs->event_thread); | |
6256 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6257 | } | |
6258 | } | |
6259 | ||
cdaa5b73 PA |
6260 | /* We come here if we hit a breakpoint but should not stop for it. |
6261 | Possibly we also were stepping and should stop for that. So fall | |
6262 | through and test for stepping. But, if not stepping, do not | |
6263 | stop. */ | |
c906108c | 6264 | |
a7212384 UW |
6265 | /* In all-stop mode, if we're currently stepping but have stopped in |
6266 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6267 | if (switch_back_to_stepped_thread (ecs)) |
6268 | return; | |
776f04fa | 6269 | |
8358c15c | 6270 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6271 | { |
527159b7 | 6272 | if (debug_infrun) |
d3169d93 DJ |
6273 | fprintf_unfiltered (gdb_stdlog, |
6274 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 6275 | |
488f131b JB |
6276 | /* Having a step-resume breakpoint overrides anything |
6277 | else having to do with stepping commands until | |
6278 | that breakpoint is reached. */ | |
488f131b JB |
6279 | keep_going (ecs); |
6280 | return; | |
6281 | } | |
c5aa993b | 6282 | |
16c381f0 | 6283 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6284 | { |
527159b7 | 6285 | if (debug_infrun) |
8a9de0e4 | 6286 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 6287 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6288 | keep_going (ecs); |
6289 | return; | |
6290 | } | |
c5aa993b | 6291 | |
4b7703ad JB |
6292 | /* Re-fetch current thread's frame in case the code above caused |
6293 | the frame cache to be re-initialized, making our FRAME variable | |
6294 | a dangling pointer. */ | |
6295 | frame = get_current_frame (); | |
628fe4e4 | 6296 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6297 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6298 | |
488f131b | 6299 | /* If stepping through a line, keep going if still within it. |
c906108c | 6300 | |
488f131b JB |
6301 | Note that step_range_end is the address of the first instruction |
6302 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6303 | within it! |
6304 | ||
6305 | Note also that during reverse execution, we may be stepping | |
6306 | through a function epilogue and therefore must detect when | |
6307 | the current-frame changes in the middle of a line. */ | |
6308 | ||
f2ffa92b PA |
6309 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6310 | ecs->event_thread) | |
31410e84 | 6311 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6312 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6313 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6314 | { |
527159b7 | 6315 | if (debug_infrun) |
5af949e3 UW |
6316 | fprintf_unfiltered |
6317 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
6318 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
6319 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6320 | |
c1e36e3e PA |
6321 | /* Tentatively re-enable range stepping; `resume' disables it if |
6322 | necessary (e.g., if we're stepping over a breakpoint or we | |
6323 | have software watchpoints). */ | |
6324 | ecs->event_thread->control.may_range_step = 1; | |
6325 | ||
b2175913 MS |
6326 | /* When stepping backward, stop at beginning of line range |
6327 | (unless it's the function entry point, in which case | |
6328 | keep going back to the call point). */ | |
f2ffa92b | 6329 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6330 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6331 | && stop_pc != ecs->stop_func_start |
6332 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6333 | end_stepping_range (ecs); |
b2175913 MS |
6334 | else |
6335 | keep_going (ecs); | |
6336 | ||
488f131b JB |
6337 | return; |
6338 | } | |
c5aa993b | 6339 | |
488f131b | 6340 | /* We stepped out of the stepping range. */ |
c906108c | 6341 | |
488f131b | 6342 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6343 | loader dynamic symbol resolution code... |
6344 | ||
6345 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6346 | time loader code and reach the callee's address. | |
6347 | ||
6348 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6349 | the runtime loader code is handled just like any other | |
6350 | undebuggable function call. Now we need only keep stepping | |
6351 | backward through the trampoline code, and that's handled further | |
6352 | down, so there is nothing for us to do here. */ | |
6353 | ||
6354 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6355 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6356 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6357 | { |
4c8c40e6 | 6358 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6359 | gdbarch_skip_solib_resolver (gdbarch, |
6360 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6361 | |
527159b7 | 6362 | if (debug_infrun) |
3e43a32a MS |
6363 | fprintf_unfiltered (gdb_stdlog, |
6364 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 6365 | |
488f131b JB |
6366 | if (pc_after_resolver) |
6367 | { | |
6368 | /* Set up a step-resume breakpoint at the address | |
6369 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6370 | symtab_and_line sr_sal; |
488f131b | 6371 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6372 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6373 | |
a6d9a66e UW |
6374 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6375 | sr_sal, null_frame_id); | |
c5aa993b | 6376 | } |
c906108c | 6377 | |
488f131b JB |
6378 | keep_going (ecs); |
6379 | return; | |
6380 | } | |
c906108c | 6381 | |
1d509aa6 MM |
6382 | /* Step through an indirect branch thunk. */ |
6383 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6384 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6385 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 MM |
6386 | { |
6387 | if (debug_infrun) | |
6388 | fprintf_unfiltered (gdb_stdlog, | |
6389 | "infrun: stepped into indirect branch thunk\n"); | |
6390 | keep_going (ecs); | |
6391 | return; | |
6392 | } | |
6393 | ||
16c381f0 JK |
6394 | if (ecs->event_thread->control.step_range_end != 1 |
6395 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6396 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6397 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6398 | { |
527159b7 | 6399 | if (debug_infrun) |
3e43a32a MS |
6400 | fprintf_unfiltered (gdb_stdlog, |
6401 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 6402 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6403 | a signal trampoline (either by a signal being delivered or by |
6404 | the signal handler returning). Just single-step until the | |
6405 | inferior leaves the trampoline (either by calling the handler | |
6406 | or returning). */ | |
488f131b JB |
6407 | keep_going (ecs); |
6408 | return; | |
6409 | } | |
c906108c | 6410 | |
14132e89 MR |
6411 | /* If we're in the return path from a shared library trampoline, |
6412 | we want to proceed through the trampoline when stepping. */ | |
6413 | /* macro/2012-04-25: This needs to come before the subroutine | |
6414 | call check below as on some targets return trampolines look | |
6415 | like subroutine calls (MIPS16 return thunks). */ | |
6416 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
6417 | ecs->event_thread->suspend.stop_pc, |
6418 | ecs->stop_func_name) | |
14132e89 MR |
6419 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6420 | { | |
6421 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
6422 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6423 | CORE_ADDR real_stop_pc | |
6424 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 MR |
6425 | |
6426 | if (debug_infrun) | |
6427 | fprintf_unfiltered (gdb_stdlog, | |
6428 | "infrun: stepped into solib return tramp\n"); | |
6429 | ||
6430 | /* Only proceed through if we know where it's going. */ | |
6431 | if (real_stop_pc) | |
6432 | { | |
6433 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6434 | symtab_and_line sr_sal; |
14132e89 MR |
6435 | sr_sal.pc = real_stop_pc; |
6436 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6437 | sr_sal.pspace = get_frame_program_space (frame); | |
6438 | ||
6439 | /* Do not specify what the fp should be when we stop since | |
6440 | on some machines the prologue is where the new fp value | |
6441 | is established. */ | |
6442 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6443 | sr_sal, null_frame_id); | |
6444 | ||
6445 | /* Restart without fiddling with the step ranges or | |
6446 | other state. */ | |
6447 | keep_going (ecs); | |
6448 | return; | |
6449 | } | |
6450 | } | |
6451 | ||
c17eaafe DJ |
6452 | /* Check for subroutine calls. The check for the current frame |
6453 | equalling the step ID is not necessary - the check of the | |
6454 | previous frame's ID is sufficient - but it is a common case and | |
6455 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6456 | |
6457 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6458 | being equal, so to get into this block, both the current and | |
6459 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6460 | /* The outer_frame_id check is a heuristic to detect stepping |
6461 | through startup code. If we step over an instruction which | |
6462 | sets the stack pointer from an invalid value to a valid value, | |
6463 | we may detect that as a subroutine call from the mythical | |
6464 | "outermost" function. This could be fixed by marking | |
6465 | outermost frames as !stack_p,code_p,special_p. Then the | |
6466 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6467 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6468 | for more. */ |
edb3359d | 6469 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6470 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6471 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6472 | ecs->event_thread->control.step_stack_frame_id) |
6473 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6474 | outer_frame_id) |
885eeb5b | 6475 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 6476 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 6477 | { |
f2ffa92b | 6478 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 6479 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6480 | |
527159b7 | 6481 | if (debug_infrun) |
8a9de0e4 | 6482 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 6483 | |
b7a084be | 6484 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6485 | { |
6486 | /* I presume that step_over_calls is only 0 when we're | |
6487 | supposed to be stepping at the assembly language level | |
6488 | ("stepi"). Just stop. */ | |
388a8562 | 6489 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6490 | end_stepping_range (ecs); |
95918acb AC |
6491 | return; |
6492 | } | |
8fb3e588 | 6493 | |
388a8562 MS |
6494 | /* Reverse stepping through solib trampolines. */ |
6495 | ||
6496 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6497 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6498 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6499 | || (ecs->stop_func_start == 0 | |
6500 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6501 | { | |
6502 | /* Any solib trampoline code can be handled in reverse | |
6503 | by simply continuing to single-step. We have already | |
6504 | executed the solib function (backwards), and a few | |
6505 | steps will take us back through the trampoline to the | |
6506 | caller. */ | |
6507 | keep_going (ecs); | |
6508 | return; | |
6509 | } | |
6510 | ||
16c381f0 | 6511 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6512 | { |
b2175913 MS |
6513 | /* We're doing a "next". |
6514 | ||
6515 | Normal (forward) execution: set a breakpoint at the | |
6516 | callee's return address (the address at which the caller | |
6517 | will resume). | |
6518 | ||
6519 | Reverse (backward) execution. set the step-resume | |
6520 | breakpoint at the start of the function that we just | |
6521 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6522 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6523 | |
6524 | if (execution_direction == EXEC_REVERSE) | |
6525 | { | |
acf9414f JK |
6526 | /* If we're already at the start of the function, we've either |
6527 | just stepped backward into a single instruction function, | |
6528 | or stepped back out of a signal handler to the first instruction | |
6529 | of the function. Just keep going, which will single-step back | |
6530 | to the caller. */ | |
58c48e72 | 6531 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6532 | { |
acf9414f | 6533 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6534 | symtab_and_line sr_sal; |
acf9414f JK |
6535 | sr_sal.pc = ecs->stop_func_start; |
6536 | sr_sal.pspace = get_frame_program_space (frame); | |
6537 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6538 | sr_sal, null_frame_id); | |
6539 | } | |
b2175913 MS |
6540 | } |
6541 | else | |
568d6575 | 6542 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6543 | |
8567c30f AC |
6544 | keep_going (ecs); |
6545 | return; | |
6546 | } | |
a53c66de | 6547 | |
95918acb | 6548 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6549 | calling routine and the real function), locate the real |
6550 | function. That's what tells us (a) whether we want to step | |
6551 | into it at all, and (b) what prologue we want to run to the | |
6552 | end of, if we do step into it. */ | |
568d6575 | 6553 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6554 | if (real_stop_pc == 0) |
568d6575 | 6555 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6556 | if (real_stop_pc != 0) |
6557 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6558 | |
db5f024e | 6559 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6560 | { |
51abb421 | 6561 | symtab_and_line sr_sal; |
1b2bfbb9 | 6562 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6563 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6564 | |
a6d9a66e UW |
6565 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6566 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6567 | keep_going (ecs); |
6568 | return; | |
1b2bfbb9 RC |
6569 | } |
6570 | ||
95918acb | 6571 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6572 | thinking of stepping into and the function isn't on the skip |
6573 | list, step into it. | |
95918acb | 6574 | |
8fb3e588 AC |
6575 | If there are several symtabs at that PC (e.g. with include |
6576 | files), just want to know whether *any* of them have line | |
6577 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6578 | { |
6579 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6580 | |
95918acb | 6581 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6582 | if (tmp_sal.line != 0 |
85817405 | 6583 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
de7985c3 | 6584 | tmp_sal)) |
95918acb | 6585 | { |
b2175913 | 6586 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6587 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6588 | else |
568d6575 | 6589 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6590 | return; |
6591 | } | |
6592 | } | |
6593 | ||
6594 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6595 | set, we stop the step so that the user has a chance to switch |
6596 | in assembly mode. */ | |
16c381f0 | 6597 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6598 | && step_stop_if_no_debug) |
95918acb | 6599 | { |
bdc36728 | 6600 | end_stepping_range (ecs); |
95918acb AC |
6601 | return; |
6602 | } | |
6603 | ||
b2175913 MS |
6604 | if (execution_direction == EXEC_REVERSE) |
6605 | { | |
acf9414f JK |
6606 | /* If we're already at the start of the function, we've either just |
6607 | stepped backward into a single instruction function without line | |
6608 | number info, or stepped back out of a signal handler to the first | |
6609 | instruction of the function without line number info. Just keep | |
6610 | going, which will single-step back to the caller. */ | |
6611 | if (ecs->stop_func_start != stop_pc) | |
6612 | { | |
6613 | /* Set a breakpoint at callee's start address. | |
6614 | From there we can step once and be back in the caller. */ | |
51abb421 | 6615 | symtab_and_line sr_sal; |
acf9414f JK |
6616 | sr_sal.pc = ecs->stop_func_start; |
6617 | sr_sal.pspace = get_frame_program_space (frame); | |
6618 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6619 | sr_sal, null_frame_id); | |
6620 | } | |
b2175913 MS |
6621 | } |
6622 | else | |
6623 | /* Set a breakpoint at callee's return address (the address | |
6624 | at which the caller will resume). */ | |
568d6575 | 6625 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6626 | |
95918acb | 6627 | keep_going (ecs); |
488f131b | 6628 | return; |
488f131b | 6629 | } |
c906108c | 6630 | |
fdd654f3 MS |
6631 | /* Reverse stepping through solib trampolines. */ |
6632 | ||
6633 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6634 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 6635 | { |
f2ffa92b PA |
6636 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6637 | ||
fdd654f3 MS |
6638 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6639 | || (ecs->stop_func_start == 0 | |
6640 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6641 | { | |
6642 | /* Any solib trampoline code can be handled in reverse | |
6643 | by simply continuing to single-step. We have already | |
6644 | executed the solib function (backwards), and a few | |
6645 | steps will take us back through the trampoline to the | |
6646 | caller. */ | |
6647 | keep_going (ecs); | |
6648 | return; | |
6649 | } | |
6650 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6651 | { | |
6652 | /* Stepped backward into the solib dynsym resolver. | |
6653 | Set a breakpoint at its start and continue, then | |
6654 | one more step will take us out. */ | |
51abb421 | 6655 | symtab_and_line sr_sal; |
fdd654f3 | 6656 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 6657 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6658 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6659 | sr_sal, null_frame_id); | |
6660 | keep_going (ecs); | |
6661 | return; | |
6662 | } | |
6663 | } | |
6664 | ||
f2ffa92b | 6665 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 6666 | |
1b2bfbb9 RC |
6667 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6668 | the trampoline processing logic, however, there are some trampolines | |
6669 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6670 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6671 | && ecs->stop_func_name == NULL |
2afb61aa | 6672 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6673 | { |
527159b7 | 6674 | if (debug_infrun) |
3e43a32a MS |
6675 | fprintf_unfiltered (gdb_stdlog, |
6676 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 6677 | |
1b2bfbb9 | 6678 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6679 | undebuggable function (where there is no debugging information |
6680 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6681 | inferior stopped). Since we want to skip this kind of code, |
6682 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6683 | function - unless the user has asked us not to (via |
6684 | set step-mode) or we no longer know how to get back | |
6685 | to the call site. */ | |
6686 | if (step_stop_if_no_debug | |
c7ce8faa | 6687 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6688 | { |
6689 | /* If we have no line number and the step-stop-if-no-debug | |
6690 | is set, we stop the step so that the user has a chance to | |
6691 | switch in assembly mode. */ | |
bdc36728 | 6692 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6693 | return; |
6694 | } | |
6695 | else | |
6696 | { | |
6697 | /* Set a breakpoint at callee's return address (the address | |
6698 | at which the caller will resume). */ | |
568d6575 | 6699 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6700 | keep_going (ecs); |
6701 | return; | |
6702 | } | |
6703 | } | |
6704 | ||
16c381f0 | 6705 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6706 | { |
6707 | /* It is stepi or nexti. We always want to stop stepping after | |
6708 | one instruction. */ | |
527159b7 | 6709 | if (debug_infrun) |
8a9de0e4 | 6710 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 6711 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6712 | return; |
6713 | } | |
6714 | ||
2afb61aa | 6715 | if (stop_pc_sal.line == 0) |
488f131b JB |
6716 | { |
6717 | /* We have no line number information. That means to stop | |
6718 | stepping (does this always happen right after one instruction, | |
6719 | when we do "s" in a function with no line numbers, | |
6720 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 6721 | if (debug_infrun) |
8a9de0e4 | 6722 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 6723 | end_stepping_range (ecs); |
488f131b JB |
6724 | return; |
6725 | } | |
c906108c | 6726 | |
edb3359d DJ |
6727 | /* Look for "calls" to inlined functions, part one. If the inline |
6728 | frame machinery detected some skipped call sites, we have entered | |
6729 | a new inline function. */ | |
6730 | ||
6731 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6732 | ecs->event_thread->control.step_frame_id) |
00431a78 | 6733 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 6734 | { |
edb3359d DJ |
6735 | if (debug_infrun) |
6736 | fprintf_unfiltered (gdb_stdlog, | |
6737 | "infrun: stepped into inlined function\n"); | |
6738 | ||
51abb421 | 6739 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 6740 | |
16c381f0 | 6741 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
6742 | { |
6743 | /* For "step", we're going to stop. But if the call site | |
6744 | for this inlined function is on the same source line as | |
6745 | we were previously stepping, go down into the function | |
6746 | first. Otherwise stop at the call site. */ | |
6747 | ||
6748 | if (call_sal.line == ecs->event_thread->current_line | |
6749 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
00431a78 | 6750 | step_into_inline_frame (ecs->event_thread); |
edb3359d | 6751 | |
bdc36728 | 6752 | end_stepping_range (ecs); |
edb3359d DJ |
6753 | return; |
6754 | } | |
6755 | else | |
6756 | { | |
6757 | /* For "next", we should stop at the call site if it is on a | |
6758 | different source line. Otherwise continue through the | |
6759 | inlined function. */ | |
6760 | if (call_sal.line == ecs->event_thread->current_line | |
6761 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6762 | keep_going (ecs); | |
6763 | else | |
bdc36728 | 6764 | end_stepping_range (ecs); |
edb3359d DJ |
6765 | return; |
6766 | } | |
6767 | } | |
6768 | ||
6769 | /* Look for "calls" to inlined functions, part two. If we are still | |
6770 | in the same real function we were stepping through, but we have | |
6771 | to go further up to find the exact frame ID, we are stepping | |
6772 | through a more inlined call beyond its call site. */ | |
6773 | ||
6774 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
6775 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6776 | ecs->event_thread->control.step_frame_id) |
edb3359d | 6777 | && stepped_in_from (get_current_frame (), |
16c381f0 | 6778 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
6779 | { |
6780 | if (debug_infrun) | |
6781 | fprintf_unfiltered (gdb_stdlog, | |
6782 | "infrun: stepping through inlined function\n"); | |
6783 | ||
16c381f0 | 6784 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
6785 | keep_going (ecs); |
6786 | else | |
bdc36728 | 6787 | end_stepping_range (ecs); |
edb3359d DJ |
6788 | return; |
6789 | } | |
6790 | ||
f2ffa92b | 6791 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
6792 | && (ecs->event_thread->current_line != stop_pc_sal.line |
6793 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
6794 | { |
6795 | /* We are at the start of a different line. So stop. Note that | |
6796 | we don't stop if we step into the middle of a different line. | |
6797 | That is said to make things like for (;;) statements work | |
6798 | better. */ | |
527159b7 | 6799 | if (debug_infrun) |
3e43a32a MS |
6800 | fprintf_unfiltered (gdb_stdlog, |
6801 | "infrun: stepped to a different line\n"); | |
bdc36728 | 6802 | end_stepping_range (ecs); |
488f131b JB |
6803 | return; |
6804 | } | |
c906108c | 6805 | |
488f131b | 6806 | /* We aren't done stepping. |
c906108c | 6807 | |
488f131b JB |
6808 | Optimize by setting the stepping range to the line. |
6809 | (We might not be in the original line, but if we entered a | |
6810 | new line in mid-statement, we continue stepping. This makes | |
6811 | things like for(;;) statements work better.) */ | |
c906108c | 6812 | |
16c381f0 JK |
6813 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
6814 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 6815 | ecs->event_thread->control.may_range_step = 1; |
edb3359d | 6816 | set_step_info (frame, stop_pc_sal); |
488f131b | 6817 | |
527159b7 | 6818 | if (debug_infrun) |
8a9de0e4 | 6819 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 6820 | keep_going (ecs); |
104c1213 JM |
6821 | } |
6822 | ||
c447ac0b PA |
6823 | /* In all-stop mode, if we're currently stepping but have stopped in |
6824 | some other thread, we may need to switch back to the stepped | |
6825 | thread. Returns true we set the inferior running, false if we left | |
6826 | it stopped (and the event needs further processing). */ | |
6827 | ||
6828 | static int | |
6829 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
6830 | { | |
fbea99ea | 6831 | if (!target_is_non_stop_p ()) |
c447ac0b | 6832 | { |
99619bea PA |
6833 | struct thread_info *stepping_thread; |
6834 | ||
6835 | /* If any thread is blocked on some internal breakpoint, and we | |
6836 | simply need to step over that breakpoint to get it going | |
6837 | again, do that first. */ | |
6838 | ||
6839 | /* However, if we see an event for the stepping thread, then we | |
6840 | know all other threads have been moved past their breakpoints | |
6841 | already. Let the caller check whether the step is finished, | |
6842 | etc., before deciding to move it past a breakpoint. */ | |
6843 | if (ecs->event_thread->control.step_range_end != 0) | |
6844 | return 0; | |
6845 | ||
6846 | /* Check if the current thread is blocked on an incomplete | |
6847 | step-over, interrupted by a random signal. */ | |
6848 | if (ecs->event_thread->control.trap_expected | |
6849 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 6850 | { |
99619bea PA |
6851 | if (debug_infrun) |
6852 | { | |
6853 | fprintf_unfiltered (gdb_stdlog, | |
6854 | "infrun: need to finish step-over of [%s]\n", | |
6855 | target_pid_to_str (ecs->event_thread->ptid)); | |
6856 | } | |
6857 | keep_going (ecs); | |
6858 | return 1; | |
6859 | } | |
2adfaa28 | 6860 | |
99619bea PA |
6861 | /* Check if the current thread is blocked by a single-step |
6862 | breakpoint of another thread. */ | |
6863 | if (ecs->hit_singlestep_breakpoint) | |
6864 | { | |
6865 | if (debug_infrun) | |
6866 | { | |
6867 | fprintf_unfiltered (gdb_stdlog, | |
6868 | "infrun: need to step [%s] over single-step " | |
6869 | "breakpoint\n", | |
6870 | target_pid_to_str (ecs->ptid)); | |
6871 | } | |
6872 | keep_going (ecs); | |
6873 | return 1; | |
6874 | } | |
6875 | ||
4d9d9d04 PA |
6876 | /* If this thread needs yet another step-over (e.g., stepping |
6877 | through a delay slot), do it first before moving on to | |
6878 | another thread. */ | |
6879 | if (thread_still_needs_step_over (ecs->event_thread)) | |
6880 | { | |
6881 | if (debug_infrun) | |
6882 | { | |
6883 | fprintf_unfiltered (gdb_stdlog, | |
6884 | "infrun: thread [%s] still needs step-over\n", | |
6885 | target_pid_to_str (ecs->event_thread->ptid)); | |
6886 | } | |
6887 | keep_going (ecs); | |
6888 | return 1; | |
6889 | } | |
70509625 | 6890 | |
483805cf PA |
6891 | /* If scheduler locking applies even if not stepping, there's no |
6892 | need to walk over threads. Above we've checked whether the | |
6893 | current thread is stepping. If some other thread not the | |
6894 | event thread is stepping, then it must be that scheduler | |
6895 | locking is not in effect. */ | |
856e7dd6 | 6896 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
6897 | return 0; |
6898 | ||
4d9d9d04 PA |
6899 | /* Otherwise, we no longer expect a trap in the current thread. |
6900 | Clear the trap_expected flag before switching back -- this is | |
6901 | what keep_going does as well, if we call it. */ | |
6902 | ecs->event_thread->control.trap_expected = 0; | |
6903 | ||
6904 | /* Likewise, clear the signal if it should not be passed. */ | |
6905 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
6906 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
6907 | ||
6908 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 6909 | step/next/etc. */ |
4d9d9d04 PA |
6910 | if (start_step_over ()) |
6911 | { | |
6912 | prepare_to_wait (ecs); | |
6913 | return 1; | |
6914 | } | |
6915 | ||
6916 | /* Look for the stepping/nexting thread. */ | |
483805cf | 6917 | stepping_thread = NULL; |
4d9d9d04 | 6918 | |
08036331 | 6919 | for (thread_info *tp : all_non_exited_threads ()) |
483805cf | 6920 | { |
fbea99ea PA |
6921 | /* Ignore threads of processes the caller is not |
6922 | resuming. */ | |
483805cf | 6923 | if (!sched_multi |
e99b03dc | 6924 | && tp->ptid.pid () != ecs->ptid.pid ()) |
483805cf PA |
6925 | continue; |
6926 | ||
6927 | /* When stepping over a breakpoint, we lock all threads | |
6928 | except the one that needs to move past the breakpoint. | |
6929 | If a non-event thread has this set, the "incomplete | |
6930 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
6931 | if (tp->control.trap_expected) |
6932 | { | |
6933 | internal_error (__FILE__, __LINE__, | |
6934 | "[%s] has inconsistent state: " | |
6935 | "trap_expected=%d\n", | |
6936 | target_pid_to_str (tp->ptid), | |
6937 | tp->control.trap_expected); | |
6938 | } | |
483805cf PA |
6939 | |
6940 | /* Did we find the stepping thread? */ | |
6941 | if (tp->control.step_range_end) | |
6942 | { | |
6943 | /* Yep. There should only one though. */ | |
6944 | gdb_assert (stepping_thread == NULL); | |
6945 | ||
6946 | /* The event thread is handled at the top, before we | |
6947 | enter this loop. */ | |
6948 | gdb_assert (tp != ecs->event_thread); | |
6949 | ||
6950 | /* If some thread other than the event thread is | |
6951 | stepping, then scheduler locking can't be in effect, | |
6952 | otherwise we wouldn't have resumed the current event | |
6953 | thread in the first place. */ | |
856e7dd6 | 6954 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
6955 | |
6956 | stepping_thread = tp; | |
6957 | } | |
99619bea PA |
6958 | } |
6959 | ||
483805cf | 6960 | if (stepping_thread != NULL) |
99619bea | 6961 | { |
c447ac0b PA |
6962 | if (debug_infrun) |
6963 | fprintf_unfiltered (gdb_stdlog, | |
6964 | "infrun: switching back to stepped thread\n"); | |
6965 | ||
2ac7589c PA |
6966 | if (keep_going_stepped_thread (stepping_thread)) |
6967 | { | |
6968 | prepare_to_wait (ecs); | |
6969 | return 1; | |
6970 | } | |
6971 | } | |
6972 | } | |
2adfaa28 | 6973 | |
2ac7589c PA |
6974 | return 0; |
6975 | } | |
2adfaa28 | 6976 | |
2ac7589c PA |
6977 | /* Set a previously stepped thread back to stepping. Returns true on |
6978 | success, false if the resume is not possible (e.g., the thread | |
6979 | vanished). */ | |
6980 | ||
6981 | static int | |
6982 | keep_going_stepped_thread (struct thread_info *tp) | |
6983 | { | |
6984 | struct frame_info *frame; | |
2ac7589c PA |
6985 | struct execution_control_state ecss; |
6986 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 6987 | |
2ac7589c PA |
6988 | /* If the stepping thread exited, then don't try to switch back and |
6989 | resume it, which could fail in several different ways depending | |
6990 | on the target. Instead, just keep going. | |
2adfaa28 | 6991 | |
2ac7589c PA |
6992 | We can find a stepping dead thread in the thread list in two |
6993 | cases: | |
2adfaa28 | 6994 | |
2ac7589c PA |
6995 | - The target supports thread exit events, and when the target |
6996 | tries to delete the thread from the thread list, inferior_ptid | |
6997 | pointed at the exiting thread. In such case, calling | |
6998 | delete_thread does not really remove the thread from the list; | |
6999 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7000 | |
2ac7589c PA |
7001 | - The target's debug interface does not support thread exit |
7002 | events, and so we have no idea whatsoever if the previously | |
7003 | stepping thread is still alive. For that reason, we need to | |
7004 | synchronously query the target now. */ | |
2adfaa28 | 7005 | |
00431a78 | 7006 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c PA |
7007 | { |
7008 | if (debug_infrun) | |
7009 | fprintf_unfiltered (gdb_stdlog, | |
7010 | "infrun: not resuming previously " | |
7011 | "stepped thread, it has vanished\n"); | |
7012 | ||
00431a78 | 7013 | delete_thread (tp); |
2ac7589c | 7014 | return 0; |
c447ac0b | 7015 | } |
2ac7589c PA |
7016 | |
7017 | if (debug_infrun) | |
7018 | fprintf_unfiltered (gdb_stdlog, | |
7019 | "infrun: resuming previously stepped thread\n"); | |
7020 | ||
7021 | reset_ecs (ecs, tp); | |
00431a78 | 7022 | switch_to_thread (tp); |
2ac7589c | 7023 | |
f2ffa92b | 7024 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 7025 | frame = get_current_frame (); |
2ac7589c PA |
7026 | |
7027 | /* If the PC of the thread we were trying to single-step has | |
7028 | changed, then that thread has trapped or been signaled, but the | |
7029 | event has not been reported to GDB yet. Re-poll the target | |
7030 | looking for this particular thread's event (i.e. temporarily | |
7031 | enable schedlock) by: | |
7032 | ||
7033 | - setting a break at the current PC | |
7034 | - resuming that particular thread, only (by setting trap | |
7035 | expected) | |
7036 | ||
7037 | This prevents us continuously moving the single-step breakpoint | |
7038 | forward, one instruction at a time, overstepping. */ | |
7039 | ||
f2ffa92b | 7040 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
7041 | { |
7042 | ptid_t resume_ptid; | |
7043 | ||
7044 | if (debug_infrun) | |
7045 | fprintf_unfiltered (gdb_stdlog, | |
7046 | "infrun: expected thread advanced also (%s -> %s)\n", | |
7047 | paddress (target_gdbarch (), tp->prev_pc), | |
f2ffa92b | 7048 | paddress (target_gdbarch (), tp->suspend.stop_pc)); |
2ac7589c PA |
7049 | |
7050 | /* Clear the info of the previous step-over, as it's no longer | |
7051 | valid (if the thread was trying to step over a breakpoint, it | |
7052 | has already succeeded). It's what keep_going would do too, | |
7053 | if we called it. Do this before trying to insert the sss | |
7054 | breakpoint, otherwise if we were previously trying to step | |
7055 | over this exact address in another thread, the breakpoint is | |
7056 | skipped. */ | |
7057 | clear_step_over_info (); | |
7058 | tp->control.trap_expected = 0; | |
7059 | ||
7060 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7061 | get_frame_address_space (frame), | |
f2ffa92b | 7062 | tp->suspend.stop_pc); |
2ac7589c | 7063 | |
372316f1 | 7064 | tp->resumed = 1; |
fbea99ea | 7065 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7066 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7067 | } | |
7068 | else | |
7069 | { | |
7070 | if (debug_infrun) | |
7071 | fprintf_unfiltered (gdb_stdlog, | |
7072 | "infrun: expected thread still hasn't advanced\n"); | |
7073 | ||
7074 | keep_going_pass_signal (ecs); | |
7075 | } | |
7076 | return 1; | |
c447ac0b PA |
7077 | } |
7078 | ||
8b061563 PA |
7079 | /* Is thread TP in the middle of (software or hardware) |
7080 | single-stepping? (Note the result of this function must never be | |
7081 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7082 | |
a289b8f6 | 7083 | static int |
b3444185 | 7084 | currently_stepping (struct thread_info *tp) |
a7212384 | 7085 | { |
8358c15c JK |
7086 | return ((tp->control.step_range_end |
7087 | && tp->control.step_resume_breakpoint == NULL) | |
7088 | || tp->control.trap_expected | |
af48d08f | 7089 | || tp->stepped_breakpoint |
8358c15c | 7090 | || bpstat_should_step ()); |
a7212384 UW |
7091 | } |
7092 | ||
b2175913 MS |
7093 | /* Inferior has stepped into a subroutine call with source code that |
7094 | we should not step over. Do step to the first line of code in | |
7095 | it. */ | |
c2c6d25f JM |
7096 | |
7097 | static void | |
568d6575 UW |
7098 | handle_step_into_function (struct gdbarch *gdbarch, |
7099 | struct execution_control_state *ecs) | |
c2c6d25f | 7100 | { |
7e324e48 GB |
7101 | fill_in_stop_func (gdbarch, ecs); |
7102 | ||
f2ffa92b PA |
7103 | compunit_symtab *cust |
7104 | = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); | |
43f3e411 | 7105 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7106 | ecs->stop_func_start |
7107 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7108 | |
51abb421 | 7109 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7110 | /* Use the step_resume_break to step until the end of the prologue, |
7111 | even if that involves jumps (as it seems to on the vax under | |
7112 | 4.2). */ | |
7113 | /* If the prologue ends in the middle of a source line, continue to | |
7114 | the end of that source line (if it is still within the function). | |
7115 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7116 | if (stop_func_sal.end |
7117 | && stop_func_sal.pc != ecs->stop_func_start | |
7118 | && stop_func_sal.end < ecs->stop_func_end) | |
7119 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7120 | |
2dbd5e30 KB |
7121 | /* Architectures which require breakpoint adjustment might not be able |
7122 | to place a breakpoint at the computed address. If so, the test | |
7123 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7124 | ecs->stop_func_start to an address at which a breakpoint may be | |
7125 | legitimately placed. | |
8fb3e588 | 7126 | |
2dbd5e30 KB |
7127 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7128 | made, GDB will enter an infinite loop when stepping through | |
7129 | optimized code consisting of VLIW instructions which contain | |
7130 | subinstructions corresponding to different source lines. On | |
7131 | FR-V, it's not permitted to place a breakpoint on any but the | |
7132 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7133 | set, GDB will adjust the breakpoint address to the beginning of | |
7134 | the VLIW instruction. Thus, we need to make the corresponding | |
7135 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7136 | |
568d6575 | 7137 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7138 | { |
7139 | ecs->stop_func_start | |
568d6575 | 7140 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7141 | ecs->stop_func_start); |
2dbd5e30 KB |
7142 | } |
7143 | ||
f2ffa92b | 7144 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7145 | { |
7146 | /* We are already there: stop now. */ | |
bdc36728 | 7147 | end_stepping_range (ecs); |
c2c6d25f JM |
7148 | return; |
7149 | } | |
7150 | else | |
7151 | { | |
7152 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7153 | symtab_and_line sr_sal; |
c2c6d25f JM |
7154 | sr_sal.pc = ecs->stop_func_start; |
7155 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7156 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7157 | |
c2c6d25f | 7158 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7159 | some machines the prologue is where the new fp value is |
7160 | established. */ | |
a6d9a66e | 7161 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7162 | |
7163 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7164 | ecs->event_thread->control.step_range_end |
7165 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7166 | } |
7167 | keep_going (ecs); | |
7168 | } | |
d4f3574e | 7169 | |
b2175913 MS |
7170 | /* Inferior has stepped backward into a subroutine call with source |
7171 | code that we should not step over. Do step to the beginning of the | |
7172 | last line of code in it. */ | |
7173 | ||
7174 | static void | |
568d6575 UW |
7175 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7176 | struct execution_control_state *ecs) | |
b2175913 | 7177 | { |
43f3e411 | 7178 | struct compunit_symtab *cust; |
167e4384 | 7179 | struct symtab_and_line stop_func_sal; |
b2175913 | 7180 | |
7e324e48 GB |
7181 | fill_in_stop_func (gdbarch, ecs); |
7182 | ||
f2ffa92b | 7183 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7184 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7185 | ecs->stop_func_start |
7186 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7187 | |
f2ffa92b | 7188 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7189 | |
7190 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7191 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7192 | { |
7193 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7194 | end_stepping_range (ecs); |
b2175913 MS |
7195 | } |
7196 | else | |
7197 | { | |
7198 | /* Else just reset the step range and keep going. | |
7199 | No step-resume breakpoint, they don't work for | |
7200 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7201 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7202 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7203 | keep_going (ecs); |
7204 | } | |
7205 | return; | |
7206 | } | |
7207 | ||
d3169d93 | 7208 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7209 | This is used to both functions and to skip over code. */ |
7210 | ||
7211 | static void | |
2c03e5be PA |
7212 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7213 | struct symtab_and_line sr_sal, | |
7214 | struct frame_id sr_id, | |
7215 | enum bptype sr_type) | |
44cbf7b5 | 7216 | { |
611c83ae PA |
7217 | /* There should never be more than one step-resume or longjmp-resume |
7218 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7219 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7220 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7221 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
7222 | |
7223 | if (debug_infrun) | |
7224 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7225 | "infrun: inserting step-resume breakpoint at %s\n", |
7226 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7227 | |
8358c15c | 7228 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7229 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7230 | } |
7231 | ||
9da8c2a0 | 7232 | void |
2c03e5be PA |
7233 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7234 | struct symtab_and_line sr_sal, | |
7235 | struct frame_id sr_id) | |
7236 | { | |
7237 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7238 | sr_sal, sr_id, | |
7239 | bp_step_resume); | |
44cbf7b5 | 7240 | } |
7ce450bd | 7241 | |
2c03e5be PA |
7242 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7243 | This is used to skip a potential signal handler. | |
7ce450bd | 7244 | |
14e60db5 DJ |
7245 | This is called with the interrupted function's frame. The signal |
7246 | handler, when it returns, will resume the interrupted function at | |
7247 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7248 | |
7249 | static void | |
2c03e5be | 7250 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7251 | { |
f4c1edd8 | 7252 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7253 | |
51abb421 PA |
7254 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7255 | ||
7256 | symtab_and_line sr_sal; | |
568d6575 | 7257 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7258 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7259 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7260 | |
2c03e5be PA |
7261 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7262 | get_stack_frame_id (return_frame), | |
7263 | bp_hp_step_resume); | |
d303a6c7 AC |
7264 | } |
7265 | ||
2c03e5be PA |
7266 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7267 | is used to skip a function after stepping into it (for "next" or if | |
7268 | the called function has no debugging information). | |
14e60db5 DJ |
7269 | |
7270 | The current function has almost always been reached by single | |
7271 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7272 | current function, and the breakpoint will be set at the caller's | |
7273 | resume address. | |
7274 | ||
7275 | This is a separate function rather than reusing | |
2c03e5be | 7276 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7277 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7278 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7279 | |
7280 | static void | |
7281 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7282 | { | |
14e60db5 DJ |
7283 | /* We shouldn't have gotten here if we don't know where the call site |
7284 | is. */ | |
c7ce8faa | 7285 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7286 | |
51abb421 | 7287 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7288 | |
51abb421 | 7289 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7290 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7291 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7292 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7293 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7294 | |
a6d9a66e | 7295 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7296 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7297 | } |
7298 | ||
611c83ae PA |
7299 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7300 | new breakpoint at the target of a jmp_buf. The handling of | |
7301 | longjmp-resume uses the same mechanisms used for handling | |
7302 | "step-resume" breakpoints. */ | |
7303 | ||
7304 | static void | |
a6d9a66e | 7305 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7306 | { |
e81a37f7 TT |
7307 | /* There should never be more than one longjmp-resume breakpoint per |
7308 | thread, so we should never be setting a new | |
611c83ae | 7309 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7310 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
7311 | |
7312 | if (debug_infrun) | |
7313 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7314 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
7315 | paddress (gdbarch, pc)); | |
611c83ae | 7316 | |
e81a37f7 | 7317 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7318 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7319 | } |
7320 | ||
186c406b TT |
7321 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7322 | the exception. The block B is the block of the unwinder debug hook | |
7323 | function. FRAME is the frame corresponding to the call to this | |
7324 | function. SYM is the symbol of the function argument holding the | |
7325 | target PC of the exception. */ | |
7326 | ||
7327 | static void | |
7328 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7329 | const struct block *b, |
186c406b TT |
7330 | struct frame_info *frame, |
7331 | struct symbol *sym) | |
7332 | { | |
492d29ea | 7333 | TRY |
186c406b | 7334 | { |
63e43d3a | 7335 | struct block_symbol vsym; |
186c406b TT |
7336 | struct value *value; |
7337 | CORE_ADDR handler; | |
7338 | struct breakpoint *bp; | |
7339 | ||
de63c46b PA |
7340 | vsym = lookup_symbol_search_name (SYMBOL_SEARCH_NAME (sym), |
7341 | b, VAR_DOMAIN); | |
63e43d3a | 7342 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7343 | /* If the value was optimized out, revert to the old behavior. */ |
7344 | if (! value_optimized_out (value)) | |
7345 | { | |
7346 | handler = value_as_address (value); | |
7347 | ||
7348 | if (debug_infrun) | |
7349 | fprintf_unfiltered (gdb_stdlog, | |
7350 | "infrun: exception resume at %lx\n", | |
7351 | (unsigned long) handler); | |
7352 | ||
7353 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7354 | handler, |
7355 | bp_exception_resume).release (); | |
c70a6932 JK |
7356 | |
7357 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7358 | frame = NULL; | |
7359 | ||
5d5658a1 | 7360 | bp->thread = tp->global_num; |
186c406b TT |
7361 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7362 | } | |
7363 | } | |
492d29ea PA |
7364 | CATCH (e, RETURN_MASK_ERROR) |
7365 | { | |
7366 | /* We want to ignore errors here. */ | |
7367 | } | |
7368 | END_CATCH | |
186c406b TT |
7369 | } |
7370 | ||
28106bc2 SDJ |
7371 | /* A helper for check_exception_resume that sets an |
7372 | exception-breakpoint based on a SystemTap probe. */ | |
7373 | ||
7374 | static void | |
7375 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7376 | const struct bound_probe *probe, |
28106bc2 SDJ |
7377 | struct frame_info *frame) |
7378 | { | |
7379 | struct value *arg_value; | |
7380 | CORE_ADDR handler; | |
7381 | struct breakpoint *bp; | |
7382 | ||
7383 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7384 | if (!arg_value) | |
7385 | return; | |
7386 | ||
7387 | handler = value_as_address (arg_value); | |
7388 | ||
7389 | if (debug_infrun) | |
7390 | fprintf_unfiltered (gdb_stdlog, | |
7391 | "infrun: exception resume at %s\n", | |
6bac7473 | 7392 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
7393 | handler)); |
7394 | ||
7395 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7396 | handler, bp_exception_resume).release (); |
5d5658a1 | 7397 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7398 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7399 | } | |
7400 | ||
186c406b TT |
7401 | /* This is called when an exception has been intercepted. Check to |
7402 | see whether the exception's destination is of interest, and if so, | |
7403 | set an exception resume breakpoint there. */ | |
7404 | ||
7405 | static void | |
7406 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7407 | struct frame_info *frame) |
186c406b | 7408 | { |
729662a5 | 7409 | struct bound_probe probe; |
28106bc2 SDJ |
7410 | struct symbol *func; |
7411 | ||
7412 | /* First see if this exception unwinding breakpoint was set via a | |
7413 | SystemTap probe point. If so, the probe has two arguments: the | |
7414 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7415 | set a breakpoint there. */ | |
6bac7473 | 7416 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7417 | if (probe.prob) |
28106bc2 | 7418 | { |
729662a5 | 7419 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7420 | return; |
7421 | } | |
7422 | ||
7423 | func = get_frame_function (frame); | |
7424 | if (!func) | |
7425 | return; | |
186c406b | 7426 | |
492d29ea | 7427 | TRY |
186c406b | 7428 | { |
3977b71f | 7429 | const struct block *b; |
8157b174 | 7430 | struct block_iterator iter; |
186c406b TT |
7431 | struct symbol *sym; |
7432 | int argno = 0; | |
7433 | ||
7434 | /* The exception breakpoint is a thread-specific breakpoint on | |
7435 | the unwinder's debug hook, declared as: | |
7436 | ||
7437 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7438 | ||
7439 | The CFA argument indicates the frame to which control is | |
7440 | about to be transferred. HANDLER is the destination PC. | |
7441 | ||
7442 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7443 | This is not extremely efficient but it avoids issues in gdb | |
7444 | with computing the DWARF CFA, and it also works even in weird | |
7445 | cases such as throwing an exception from inside a signal | |
7446 | handler. */ | |
7447 | ||
7448 | b = SYMBOL_BLOCK_VALUE (func); | |
7449 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7450 | { | |
7451 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7452 | continue; | |
7453 | ||
7454 | if (argno == 0) | |
7455 | ++argno; | |
7456 | else | |
7457 | { | |
7458 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7459 | b, frame, sym); | |
7460 | break; | |
7461 | } | |
7462 | } | |
7463 | } | |
492d29ea PA |
7464 | CATCH (e, RETURN_MASK_ERROR) |
7465 | { | |
7466 | } | |
7467 | END_CATCH | |
186c406b TT |
7468 | } |
7469 | ||
104c1213 | 7470 | static void |
22bcd14b | 7471 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7472 | { |
527159b7 | 7473 | if (debug_infrun) |
22bcd14b | 7474 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 7475 | |
cd0fc7c3 SS |
7476 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7477 | ecs->wait_some_more = 0; | |
fbea99ea PA |
7478 | |
7479 | /* If all-stop, but the target is always in non-stop mode, stop all | |
7480 | threads now that we're presenting the stop to the user. */ | |
7481 | if (!non_stop && target_is_non_stop_p ()) | |
7482 | stop_all_threads (); | |
cd0fc7c3 SS |
7483 | } |
7484 | ||
4d9d9d04 PA |
7485 | /* Like keep_going, but passes the signal to the inferior, even if the |
7486 | signal is set to nopass. */ | |
d4f3574e SS |
7487 | |
7488 | static void | |
4d9d9d04 | 7489 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7490 | { |
d7e15655 | 7491 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 7492 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7493 | |
d4f3574e | 7494 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 7495 | ecs->event_thread->prev_pc |
00431a78 | 7496 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 7497 | |
4d9d9d04 | 7498 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7499 | { |
4d9d9d04 PA |
7500 | struct thread_info *tp = ecs->event_thread; |
7501 | ||
7502 | if (debug_infrun) | |
7503 | fprintf_unfiltered (gdb_stdlog, | |
7504 | "infrun: %s has trap_expected set, " | |
7505 | "resuming to collect trap\n", | |
7506 | target_pid_to_str (tp->ptid)); | |
7507 | ||
a9ba6bae PA |
7508 | /* We haven't yet gotten our trap, and either: intercepted a |
7509 | non-signal event (e.g., a fork); or took a signal which we | |
7510 | are supposed to pass through to the inferior. Simply | |
7511 | continue. */ | |
64ce06e4 | 7512 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7513 | } |
372316f1 PA |
7514 | else if (step_over_info_valid_p ()) |
7515 | { | |
7516 | /* Another thread is stepping over a breakpoint in-line. If | |
7517 | this thread needs a step-over too, queue the request. In | |
7518 | either case, this resume must be deferred for later. */ | |
7519 | struct thread_info *tp = ecs->event_thread; | |
7520 | ||
7521 | if (ecs->hit_singlestep_breakpoint | |
7522 | || thread_still_needs_step_over (tp)) | |
7523 | { | |
7524 | if (debug_infrun) | |
7525 | fprintf_unfiltered (gdb_stdlog, | |
7526 | "infrun: step-over already in progress: " | |
7527 | "step-over for %s deferred\n", | |
7528 | target_pid_to_str (tp->ptid)); | |
7529 | thread_step_over_chain_enqueue (tp); | |
7530 | } | |
7531 | else | |
7532 | { | |
7533 | if (debug_infrun) | |
7534 | fprintf_unfiltered (gdb_stdlog, | |
7535 | "infrun: step-over in progress: " | |
7536 | "resume of %s deferred\n", | |
7537 | target_pid_to_str (tp->ptid)); | |
7538 | } | |
372316f1 | 7539 | } |
d4f3574e SS |
7540 | else |
7541 | { | |
31e77af2 | 7542 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7543 | int remove_bp; |
7544 | int remove_wps; | |
8d297bbf | 7545 | step_over_what step_what; |
31e77af2 | 7546 | |
d4f3574e | 7547 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7548 | anyway (if we got a signal, the user asked it be passed to |
7549 | the child) | |
7550 | -- or -- | |
7551 | We got our expected trap, but decided we should resume from | |
7552 | it. | |
d4f3574e | 7553 | |
a9ba6bae | 7554 | We're going to run this baby now! |
d4f3574e | 7555 | |
c36b740a VP |
7556 | Note that insert_breakpoints won't try to re-insert |
7557 | already inserted breakpoints. Therefore, we don't | |
7558 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7559 | |
31e77af2 PA |
7560 | /* If we need to step over a breakpoint, and we're not using |
7561 | displaced stepping to do so, insert all breakpoints | |
7562 | (watchpoints, etc.) but the one we're stepping over, step one | |
7563 | instruction, and then re-insert the breakpoint when that step | |
7564 | is finished. */ | |
963f9c80 | 7565 | |
6c4cfb24 PA |
7566 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7567 | ||
963f9c80 | 7568 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7569 | || (step_what & STEP_OVER_BREAKPOINT)); |
7570 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7571 | |
cb71640d PA |
7572 | /* We can't use displaced stepping if we need to step past a |
7573 | watchpoint. The instruction copied to the scratch pad would | |
7574 | still trigger the watchpoint. */ | |
7575 | if (remove_bp | |
3fc8eb30 | 7576 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7577 | { |
a01bda52 | 7578 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
7579 | regcache_read_pc (regcache), remove_wps, |
7580 | ecs->event_thread->global_num); | |
45e8c884 | 7581 | } |
963f9c80 | 7582 | else if (remove_wps) |
21edc42f | 7583 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
7584 | |
7585 | /* If we now need to do an in-line step-over, we need to stop | |
7586 | all other threads. Note this must be done before | |
7587 | insert_breakpoints below, because that removes the breakpoint | |
7588 | we're about to step over, otherwise other threads could miss | |
7589 | it. */ | |
fbea99ea | 7590 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7591 | stop_all_threads (); |
abbb1732 | 7592 | |
31e77af2 | 7593 | /* Stop stepping if inserting breakpoints fails. */ |
492d29ea | 7594 | TRY |
31e77af2 PA |
7595 | { |
7596 | insert_breakpoints (); | |
7597 | } | |
492d29ea | 7598 | CATCH (e, RETURN_MASK_ERROR) |
31e77af2 PA |
7599 | { |
7600 | exception_print (gdb_stderr, e); | |
22bcd14b | 7601 | stop_waiting (ecs); |
bdf2a94a | 7602 | clear_step_over_info (); |
31e77af2 | 7603 | return; |
d4f3574e | 7604 | } |
492d29ea | 7605 | END_CATCH |
d4f3574e | 7606 | |
963f9c80 | 7607 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7608 | |
64ce06e4 | 7609 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7610 | } |
7611 | ||
488f131b | 7612 | prepare_to_wait (ecs); |
d4f3574e SS |
7613 | } |
7614 | ||
4d9d9d04 PA |
7615 | /* Called when we should continue running the inferior, because the |
7616 | current event doesn't cause a user visible stop. This does the | |
7617 | resuming part; waiting for the next event is done elsewhere. */ | |
7618 | ||
7619 | static void | |
7620 | keep_going (struct execution_control_state *ecs) | |
7621 | { | |
7622 | if (ecs->event_thread->control.trap_expected | |
7623 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7624 | ecs->event_thread->control.trap_expected = 0; | |
7625 | ||
7626 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7627 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7628 | keep_going_pass_signal (ecs); | |
7629 | } | |
7630 | ||
104c1213 JM |
7631 | /* This function normally comes after a resume, before |
7632 | handle_inferior_event exits. It takes care of any last bits of | |
7633 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7634 | |
104c1213 JM |
7635 | static void |
7636 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7637 | { |
527159b7 | 7638 | if (debug_infrun) |
8a9de0e4 | 7639 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 7640 | |
104c1213 | 7641 | ecs->wait_some_more = 1; |
0b333c5e PA |
7642 | |
7643 | if (!target_is_async_p ()) | |
7644 | mark_infrun_async_event_handler (); | |
c906108c | 7645 | } |
11cf8741 | 7646 | |
fd664c91 | 7647 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7648 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7649 | |
7650 | static void | |
bdc36728 | 7651 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7652 | { |
bdc36728 | 7653 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7654 | stop_waiting (ecs); |
fd664c91 PA |
7655 | } |
7656 | ||
33d62d64 JK |
7657 | /* Several print_*_reason functions to print why the inferior has stopped. |
7658 | We always print something when the inferior exits, or receives a signal. | |
7659 | The rest of the cases are dealt with later on in normal_stop and | |
7660 | print_it_typical. Ideally there should be a call to one of these | |
7661 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7662 | stop_waiting is called. |
33d62d64 | 7663 | |
fd664c91 PA |
7664 | Note that we don't call these directly, instead we delegate that to |
7665 | the interpreters, through observers. Interpreters then call these | |
7666 | with whatever uiout is right. */ | |
33d62d64 | 7667 | |
fd664c91 PA |
7668 | void |
7669 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7670 | { |
fd664c91 | 7671 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7672 | |
112e8700 | 7673 | if (uiout->is_mi_like_p ()) |
fd664c91 | 7674 | { |
112e8700 | 7675 | uiout->field_string ("reason", |
fd664c91 PA |
7676 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
7677 | } | |
7678 | } | |
33d62d64 | 7679 | |
fd664c91 PA |
7680 | void |
7681 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7682 | { |
33d62d64 | 7683 | annotate_signalled (); |
112e8700 SM |
7684 | if (uiout->is_mi_like_p ()) |
7685 | uiout->field_string | |
7686 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7687 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 7688 | annotate_signal_name (); |
112e8700 | 7689 | uiout->field_string ("signal-name", |
2ea28649 | 7690 | gdb_signal_to_name (siggnal)); |
33d62d64 | 7691 | annotate_signal_name_end (); |
112e8700 | 7692 | uiout->text (", "); |
33d62d64 | 7693 | annotate_signal_string (); |
112e8700 | 7694 | uiout->field_string ("signal-meaning", |
2ea28649 | 7695 | gdb_signal_to_string (siggnal)); |
33d62d64 | 7696 | annotate_signal_string_end (); |
112e8700 SM |
7697 | uiout->text (".\n"); |
7698 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
7699 | } |
7700 | ||
fd664c91 PA |
7701 | void |
7702 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7703 | { |
fda326dd | 7704 | struct inferior *inf = current_inferior (); |
f2907e49 | 7705 | const char *pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 7706 | |
33d62d64 JK |
7707 | annotate_exited (exitstatus); |
7708 | if (exitstatus) | |
7709 | { | |
112e8700 SM |
7710 | if (uiout->is_mi_like_p ()) |
7711 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
7712 | uiout->text ("[Inferior "); | |
7713 | uiout->text (plongest (inf->num)); | |
7714 | uiout->text (" ("); | |
7715 | uiout->text (pidstr); | |
7716 | uiout->text (") exited with code "); | |
7717 | uiout->field_fmt ("exit-code", "0%o", (unsigned int) exitstatus); | |
7718 | uiout->text ("]\n"); | |
33d62d64 JK |
7719 | } |
7720 | else | |
11cf8741 | 7721 | { |
112e8700 SM |
7722 | if (uiout->is_mi_like_p ()) |
7723 | uiout->field_string | |
7724 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
7725 | uiout->text ("[Inferior "); | |
7726 | uiout->text (plongest (inf->num)); | |
7727 | uiout->text (" ("); | |
7728 | uiout->text (pidstr); | |
7729 | uiout->text (") exited normally]\n"); | |
33d62d64 | 7730 | } |
33d62d64 JK |
7731 | } |
7732 | ||
012b3a21 WT |
7733 | /* Some targets/architectures can do extra processing/display of |
7734 | segmentation faults. E.g., Intel MPX boundary faults. | |
7735 | Call the architecture dependent function to handle the fault. */ | |
7736 | ||
7737 | static void | |
7738 | handle_segmentation_fault (struct ui_out *uiout) | |
7739 | { | |
7740 | struct regcache *regcache = get_current_regcache (); | |
ac7936df | 7741 | struct gdbarch *gdbarch = regcache->arch (); |
012b3a21 WT |
7742 | |
7743 | if (gdbarch_handle_segmentation_fault_p (gdbarch)) | |
7744 | gdbarch_handle_segmentation_fault (gdbarch, uiout); | |
7745 | } | |
7746 | ||
fd664c91 PA |
7747 | void |
7748 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 7749 | { |
f303dbd6 PA |
7750 | struct thread_info *thr = inferior_thread (); |
7751 | ||
33d62d64 JK |
7752 | annotate_signal (); |
7753 | ||
112e8700 | 7754 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
7755 | ; |
7756 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 7757 | { |
f303dbd6 | 7758 | const char *name; |
33d62d64 | 7759 | |
112e8700 SM |
7760 | uiout->text ("\nThread "); |
7761 | uiout->field_fmt ("thread-id", "%s", print_thread_id (thr)); | |
f303dbd6 PA |
7762 | |
7763 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
7764 | if (name != NULL) | |
7765 | { | |
112e8700 SM |
7766 | uiout->text (" \""); |
7767 | uiout->field_fmt ("name", "%s", name); | |
7768 | uiout->text ("\""); | |
f303dbd6 | 7769 | } |
33d62d64 | 7770 | } |
f303dbd6 | 7771 | else |
112e8700 | 7772 | uiout->text ("\nProgram"); |
f303dbd6 | 7773 | |
112e8700 SM |
7774 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
7775 | uiout->text (" stopped"); | |
33d62d64 JK |
7776 | else |
7777 | { | |
112e8700 | 7778 | uiout->text (" received signal "); |
8b93c638 | 7779 | annotate_signal_name (); |
112e8700 SM |
7780 | if (uiout->is_mi_like_p ()) |
7781 | uiout->field_string | |
7782 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
7783 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 7784 | annotate_signal_name_end (); |
112e8700 | 7785 | uiout->text (", "); |
8b93c638 | 7786 | annotate_signal_string (); |
112e8700 | 7787 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 WT |
7788 | |
7789 | if (siggnal == GDB_SIGNAL_SEGV) | |
7790 | handle_segmentation_fault (uiout); | |
7791 | ||
8b93c638 | 7792 | annotate_signal_string_end (); |
33d62d64 | 7793 | } |
112e8700 | 7794 | uiout->text (".\n"); |
33d62d64 | 7795 | } |
252fbfc8 | 7796 | |
fd664c91 PA |
7797 | void |
7798 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 7799 | { |
112e8700 | 7800 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 7801 | } |
43ff13b4 | 7802 | |
0c7e1a46 PA |
7803 | /* Print current location without a level number, if we have changed |
7804 | functions or hit a breakpoint. Print source line if we have one. | |
7805 | bpstat_print contains the logic deciding in detail what to print, | |
7806 | based on the event(s) that just occurred. */ | |
7807 | ||
243a9253 PA |
7808 | static void |
7809 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
7810 | { |
7811 | int bpstat_ret; | |
f486487f | 7812 | enum print_what source_flag; |
0c7e1a46 PA |
7813 | int do_frame_printing = 1; |
7814 | struct thread_info *tp = inferior_thread (); | |
7815 | ||
7816 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
7817 | switch (bpstat_ret) | |
7818 | { | |
7819 | case PRINT_UNKNOWN: | |
7820 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
7821 | should) carry around the function and does (or should) use | |
7822 | that when doing a frame comparison. */ | |
7823 | if (tp->control.stop_step | |
7824 | && frame_id_eq (tp->control.step_frame_id, | |
7825 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
7826 | && (tp->control.step_start_function |
7827 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
7828 | { |
7829 | /* Finished step, just print source line. */ | |
7830 | source_flag = SRC_LINE; | |
7831 | } | |
7832 | else | |
7833 | { | |
7834 | /* Print location and source line. */ | |
7835 | source_flag = SRC_AND_LOC; | |
7836 | } | |
7837 | break; | |
7838 | case PRINT_SRC_AND_LOC: | |
7839 | /* Print location and source line. */ | |
7840 | source_flag = SRC_AND_LOC; | |
7841 | break; | |
7842 | case PRINT_SRC_ONLY: | |
7843 | source_flag = SRC_LINE; | |
7844 | break; | |
7845 | case PRINT_NOTHING: | |
7846 | /* Something bogus. */ | |
7847 | source_flag = SRC_LINE; | |
7848 | do_frame_printing = 0; | |
7849 | break; | |
7850 | default: | |
7851 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
7852 | } | |
7853 | ||
7854 | /* The behavior of this routine with respect to the source | |
7855 | flag is: | |
7856 | SRC_LINE: Print only source line | |
7857 | LOCATION: Print only location | |
7858 | SRC_AND_LOC: Print location and source line. */ | |
7859 | if (do_frame_printing) | |
7860 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
7861 | } |
7862 | ||
243a9253 PA |
7863 | /* See infrun.h. */ |
7864 | ||
7865 | void | |
7866 | print_stop_event (struct ui_out *uiout) | |
7867 | { | |
243a9253 PA |
7868 | struct target_waitstatus last; |
7869 | ptid_t last_ptid; | |
7870 | struct thread_info *tp; | |
7871 | ||
7872 | get_last_target_status (&last_ptid, &last); | |
7873 | ||
67ad9399 TT |
7874 | { |
7875 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 7876 | |
67ad9399 | 7877 | print_stop_location (&last); |
243a9253 | 7878 | |
67ad9399 TT |
7879 | /* Display the auto-display expressions. */ |
7880 | do_displays (); | |
7881 | } | |
243a9253 PA |
7882 | |
7883 | tp = inferior_thread (); | |
7884 | if (tp->thread_fsm != NULL | |
46e3ed7f | 7885 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
7886 | { |
7887 | struct return_value_info *rv; | |
7888 | ||
46e3ed7f | 7889 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
7890 | if (rv != NULL) |
7891 | print_return_value (uiout, rv); | |
7892 | } | |
0c7e1a46 PA |
7893 | } |
7894 | ||
388a7084 PA |
7895 | /* See infrun.h. */ |
7896 | ||
7897 | void | |
7898 | maybe_remove_breakpoints (void) | |
7899 | { | |
7900 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
7901 | { | |
7902 | if (remove_breakpoints ()) | |
7903 | { | |
223ffa71 | 7904 | target_terminal::ours_for_output (); |
388a7084 PA |
7905 | printf_filtered (_("Cannot remove breakpoints because " |
7906 | "program is no longer writable.\nFurther " | |
7907 | "execution is probably impossible.\n")); | |
7908 | } | |
7909 | } | |
7910 | } | |
7911 | ||
4c2f2a79 PA |
7912 | /* The execution context that just caused a normal stop. */ |
7913 | ||
7914 | struct stop_context | |
7915 | { | |
2d844eaf TT |
7916 | stop_context (); |
7917 | ~stop_context (); | |
7918 | ||
7919 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
7920 | ||
7921 | bool changed () const; | |
7922 | ||
4c2f2a79 PA |
7923 | /* The stop ID. */ |
7924 | ULONGEST stop_id; | |
c906108c | 7925 | |
4c2f2a79 | 7926 | /* The event PTID. */ |
c906108c | 7927 | |
4c2f2a79 PA |
7928 | ptid_t ptid; |
7929 | ||
7930 | /* If stopp for a thread event, this is the thread that caused the | |
7931 | stop. */ | |
7932 | struct thread_info *thread; | |
7933 | ||
7934 | /* The inferior that caused the stop. */ | |
7935 | int inf_num; | |
7936 | }; | |
7937 | ||
2d844eaf | 7938 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
7939 | takes a strong reference to the thread. */ |
7940 | ||
2d844eaf | 7941 | stop_context::stop_context () |
4c2f2a79 | 7942 | { |
2d844eaf TT |
7943 | stop_id = get_stop_id (); |
7944 | ptid = inferior_ptid; | |
7945 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 7946 | |
d7e15655 | 7947 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
7948 | { |
7949 | /* Take a strong reference so that the thread can't be deleted | |
7950 | yet. */ | |
2d844eaf TT |
7951 | thread = inferior_thread (); |
7952 | thread->incref (); | |
4c2f2a79 PA |
7953 | } |
7954 | else | |
2d844eaf | 7955 | thread = NULL; |
4c2f2a79 PA |
7956 | } |
7957 | ||
7958 | /* Release a stop context previously created with save_stop_context. | |
7959 | Releases the strong reference to the thread as well. */ | |
7960 | ||
2d844eaf | 7961 | stop_context::~stop_context () |
4c2f2a79 | 7962 | { |
2d844eaf TT |
7963 | if (thread != NULL) |
7964 | thread->decref (); | |
4c2f2a79 PA |
7965 | } |
7966 | ||
7967 | /* Return true if the current context no longer matches the saved stop | |
7968 | context. */ | |
7969 | ||
2d844eaf TT |
7970 | bool |
7971 | stop_context::changed () const | |
7972 | { | |
7973 | if (ptid != inferior_ptid) | |
7974 | return true; | |
7975 | if (inf_num != current_inferior ()->num) | |
7976 | return true; | |
7977 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
7978 | return true; | |
7979 | if (get_stop_id () != stop_id) | |
7980 | return true; | |
7981 | return false; | |
4c2f2a79 PA |
7982 | } |
7983 | ||
7984 | /* See infrun.h. */ | |
7985 | ||
7986 | int | |
96baa820 | 7987 | normal_stop (void) |
c906108c | 7988 | { |
73b65bb0 DJ |
7989 | struct target_waitstatus last; |
7990 | ptid_t last_ptid; | |
7991 | ||
7992 | get_last_target_status (&last_ptid, &last); | |
7993 | ||
4c2f2a79 PA |
7994 | new_stop_id (); |
7995 | ||
29f49a6a PA |
7996 | /* If an exception is thrown from this point on, make sure to |
7997 | propagate GDB's knowledge of the executing state to the | |
7998 | frontend/user running state. A QUIT is an easy exception to see | |
7999 | here, so do this before any filtered output. */ | |
731f534f PA |
8000 | |
8001 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8002 | ||
c35b1492 | 8003 | if (!non_stop) |
731f534f | 8004 | maybe_finish_thread_state.emplace (minus_one_ptid); |
e1316e60 PA |
8005 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8006 | || last.kind == TARGET_WAITKIND_EXITED) | |
8007 | { | |
8008 | /* On some targets, we may still have live threads in the | |
8009 | inferior when we get a process exit event. E.g., for | |
8010 | "checkpoint", when the current checkpoint/fork exits, | |
8011 | linux-fork.c automatically switches to another fork from | |
8012 | within target_mourn_inferior. */ | |
731f534f PA |
8013 | if (inferior_ptid != null_ptid) |
8014 | maybe_finish_thread_state.emplace (ptid_t (inferior_ptid.pid ())); | |
e1316e60 PA |
8015 | } |
8016 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
731f534f | 8017 | maybe_finish_thread_state.emplace (inferior_ptid); |
29f49a6a | 8018 | |
b57bacec PA |
8019 | /* As we're presenting a stop, and potentially removing breakpoints, |
8020 | update the thread list so we can tell whether there are threads | |
8021 | running on the target. With target remote, for example, we can | |
8022 | only learn about new threads when we explicitly update the thread | |
8023 | list. Do this before notifying the interpreters about signal | |
8024 | stops, end of stepping ranges, etc., so that the "new thread" | |
8025 | output is emitted before e.g., "Program received signal FOO", | |
8026 | instead of after. */ | |
8027 | update_thread_list (); | |
8028 | ||
8029 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 8030 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 8031 | |
c906108c SS |
8032 | /* As with the notification of thread events, we want to delay |
8033 | notifying the user that we've switched thread context until | |
8034 | the inferior actually stops. | |
8035 | ||
73b65bb0 DJ |
8036 | There's no point in saying anything if the inferior has exited. |
8037 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8038 | "received a signal". |
8039 | ||
8040 | Also skip saying anything in non-stop mode. In that mode, as we | |
8041 | don't want GDB to switch threads behind the user's back, to avoid | |
8042 | races where the user is typing a command to apply to thread x, | |
8043 | but GDB switches to thread y before the user finishes entering | |
8044 | the command, fetch_inferior_event installs a cleanup to restore | |
8045 | the current thread back to the thread the user had selected right | |
8046 | after this event is handled, so we're not really switching, only | |
8047 | informing of a stop. */ | |
4f8d22e3 | 8048 | if (!non_stop |
731f534f | 8049 | && previous_inferior_ptid != inferior_ptid |
73b65bb0 DJ |
8050 | && target_has_execution |
8051 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8052 | && last.kind != TARGET_WAITKIND_EXITED |
8053 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8054 | { |
0e454242 | 8055 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8056 | { |
223ffa71 | 8057 | target_terminal::ours_for_output (); |
3b12939d PA |
8058 | printf_filtered (_("[Switching to %s]\n"), |
8059 | target_pid_to_str (inferior_ptid)); | |
8060 | annotate_thread_changed (); | |
8061 | } | |
39f77062 | 8062 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8063 | } |
c906108c | 8064 | |
0e5bf2a8 PA |
8065 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8066 | { | |
0e454242 | 8067 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8068 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8069 | { | |
223ffa71 | 8070 | target_terminal::ours_for_output (); |
3b12939d PA |
8071 | printf_filtered (_("No unwaited-for children left.\n")); |
8072 | } | |
0e5bf2a8 PA |
8073 | } |
8074 | ||
b57bacec | 8075 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8076 | maybe_remove_breakpoints (); |
c906108c | 8077 | |
c906108c SS |
8078 | /* If an auto-display called a function and that got a signal, |
8079 | delete that auto-display to avoid an infinite recursion. */ | |
8080 | ||
8081 | if (stopped_by_random_signal) | |
8082 | disable_current_display (); | |
8083 | ||
0e454242 | 8084 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8085 | { |
8086 | async_enable_stdin (); | |
8087 | } | |
c906108c | 8088 | |
388a7084 | 8089 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8090 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8091 | |
8092 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8093 | and current location is based on that. Handle the case where the | |
8094 | dummy call is returning after being stopped. E.g. the dummy call | |
8095 | previously hit a breakpoint. (If the dummy call returns | |
8096 | normally, we won't reach here.) Do this before the stop hook is | |
8097 | run, so that it doesn't get to see the temporary dummy frame, | |
8098 | which is not where we'll present the stop. */ | |
8099 | if (has_stack_frames ()) | |
8100 | { | |
8101 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8102 | { | |
8103 | /* Pop the empty frame that contains the stack dummy. This | |
8104 | also restores inferior state prior to the call (struct | |
8105 | infcall_suspend_state). */ | |
8106 | struct frame_info *frame = get_current_frame (); | |
8107 | ||
8108 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8109 | frame_pop (frame); | |
8110 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8111 | does which means there's now no selected frame. */ | |
8112 | } | |
8113 | ||
8114 | select_frame (get_current_frame ()); | |
8115 | ||
8116 | /* Set the current source location. */ | |
8117 | set_current_sal_from_frame (get_current_frame ()); | |
8118 | } | |
dd7e2d2b PA |
8119 | |
8120 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8121 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8122 | if (stop_command != NULL) |
8123 | { | |
2d844eaf | 8124 | stop_context saved_context; |
4c2f2a79 | 8125 | |
bf469271 PA |
8126 | TRY |
8127 | { | |
8128 | execute_cmd_pre_hook (stop_command); | |
8129 | } | |
8130 | CATCH (ex, RETURN_MASK_ALL) | |
8131 | { | |
8132 | exception_fprintf (gdb_stderr, ex, | |
8133 | "Error while running hook_stop:\n"); | |
8134 | } | |
8135 | END_CATCH | |
4c2f2a79 PA |
8136 | |
8137 | /* If the stop hook resumes the target, then there's no point in | |
8138 | trying to notify about the previous stop; its context is | |
8139 | gone. Likewise if the command switches thread or inferior -- | |
8140 | the observers would print a stop for the wrong | |
8141 | thread/inferior. */ | |
2d844eaf TT |
8142 | if (saved_context.changed ()) |
8143 | return 1; | |
4c2f2a79 | 8144 | } |
dd7e2d2b | 8145 | |
388a7084 PA |
8146 | /* Notify observers about the stop. This is where the interpreters |
8147 | print the stop event. */ | |
d7e15655 | 8148 | if (inferior_ptid != null_ptid) |
76727919 | 8149 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
388a7084 PA |
8150 | stop_print_frame); |
8151 | else | |
76727919 | 8152 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8153 | |
243a9253 PA |
8154 | annotate_stopped (); |
8155 | ||
48844aa6 PA |
8156 | if (target_has_execution) |
8157 | { | |
8158 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
8159 | && last.kind != TARGET_WAITKIND_EXITED) | |
8160 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
8161 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8162 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8163 | } |
6c95b8df PA |
8164 | |
8165 | /* Try to get rid of automatically added inferiors that are no | |
8166 | longer needed. Keeping those around slows down things linearly. | |
8167 | Note that this never removes the current inferior. */ | |
8168 | prune_inferiors (); | |
4c2f2a79 PA |
8169 | |
8170 | return 0; | |
c906108c | 8171 | } |
c906108c | 8172 | \f |
c5aa993b | 8173 | int |
96baa820 | 8174 | signal_stop_state (int signo) |
c906108c | 8175 | { |
d6b48e9c | 8176 | return signal_stop[signo]; |
c906108c SS |
8177 | } |
8178 | ||
c5aa993b | 8179 | int |
96baa820 | 8180 | signal_print_state (int signo) |
c906108c SS |
8181 | { |
8182 | return signal_print[signo]; | |
8183 | } | |
8184 | ||
c5aa993b | 8185 | int |
96baa820 | 8186 | signal_pass_state (int signo) |
c906108c SS |
8187 | { |
8188 | return signal_program[signo]; | |
8189 | } | |
8190 | ||
2455069d UW |
8191 | static void |
8192 | signal_cache_update (int signo) | |
8193 | { | |
8194 | if (signo == -1) | |
8195 | { | |
a493e3e2 | 8196 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8197 | signal_cache_update (signo); |
8198 | ||
8199 | return; | |
8200 | } | |
8201 | ||
8202 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8203 | && signal_print[signo] == 0 | |
ab04a2af TT |
8204 | && signal_program[signo] == 1 |
8205 | && signal_catch[signo] == 0); | |
2455069d UW |
8206 | } |
8207 | ||
488f131b | 8208 | int |
7bda5e4a | 8209 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8210 | { |
8211 | int ret = signal_stop[signo]; | |
abbb1732 | 8212 | |
d4f3574e | 8213 | signal_stop[signo] = state; |
2455069d | 8214 | signal_cache_update (signo); |
d4f3574e SS |
8215 | return ret; |
8216 | } | |
8217 | ||
488f131b | 8218 | int |
7bda5e4a | 8219 | signal_print_update (int signo, int state) |
d4f3574e SS |
8220 | { |
8221 | int ret = signal_print[signo]; | |
abbb1732 | 8222 | |
d4f3574e | 8223 | signal_print[signo] = state; |
2455069d | 8224 | signal_cache_update (signo); |
d4f3574e SS |
8225 | return ret; |
8226 | } | |
8227 | ||
488f131b | 8228 | int |
7bda5e4a | 8229 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8230 | { |
8231 | int ret = signal_program[signo]; | |
abbb1732 | 8232 | |
d4f3574e | 8233 | signal_program[signo] = state; |
2455069d | 8234 | signal_cache_update (signo); |
d4f3574e SS |
8235 | return ret; |
8236 | } | |
8237 | ||
ab04a2af TT |
8238 | /* Update the global 'signal_catch' from INFO and notify the |
8239 | target. */ | |
8240 | ||
8241 | void | |
8242 | signal_catch_update (const unsigned int *info) | |
8243 | { | |
8244 | int i; | |
8245 | ||
8246 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8247 | signal_catch[i] = info[i] > 0; | |
8248 | signal_cache_update (-1); | |
adc6a863 | 8249 | target_pass_signals (signal_pass); |
ab04a2af TT |
8250 | } |
8251 | ||
c906108c | 8252 | static void |
96baa820 | 8253 | sig_print_header (void) |
c906108c | 8254 | { |
3e43a32a MS |
8255 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8256 | "to program\tDescription\n")); | |
c906108c SS |
8257 | } |
8258 | ||
8259 | static void | |
2ea28649 | 8260 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8261 | { |
2ea28649 | 8262 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8263 | int name_padding = 13 - strlen (name); |
96baa820 | 8264 | |
c906108c SS |
8265 | if (name_padding <= 0) |
8266 | name_padding = 0; | |
8267 | ||
8268 | printf_filtered ("%s", name); | |
488f131b | 8269 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8270 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8271 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8272 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8273 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8274 | } |
8275 | ||
8276 | /* Specify how various signals in the inferior should be handled. */ | |
8277 | ||
8278 | static void | |
0b39b52e | 8279 | handle_command (const char *args, int from_tty) |
c906108c | 8280 | { |
c906108c | 8281 | int digits, wordlen; |
b926417a | 8282 | int sigfirst, siglast; |
2ea28649 | 8283 | enum gdb_signal oursig; |
c906108c | 8284 | int allsigs; |
c906108c SS |
8285 | |
8286 | if (args == NULL) | |
8287 | { | |
e2e0b3e5 | 8288 | error_no_arg (_("signal to handle")); |
c906108c SS |
8289 | } |
8290 | ||
1777feb0 | 8291 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8292 | |
adc6a863 PA |
8293 | const size_t nsigs = GDB_SIGNAL_LAST; |
8294 | unsigned char sigs[nsigs] {}; | |
c906108c | 8295 | |
1777feb0 | 8296 | /* Break the command line up into args. */ |
c906108c | 8297 | |
773a1edc | 8298 | gdb_argv built_argv (args); |
c906108c SS |
8299 | |
8300 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8301 | actions. Signal numbers and signal names may be interspersed with | |
8302 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8303 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8304 | |
773a1edc | 8305 | for (char *arg : built_argv) |
c906108c | 8306 | { |
773a1edc TT |
8307 | wordlen = strlen (arg); |
8308 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8309 | {; |
8310 | } | |
8311 | allsigs = 0; | |
8312 | sigfirst = siglast = -1; | |
8313 | ||
773a1edc | 8314 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8315 | { |
8316 | /* Apply action to all signals except those used by the | |
1777feb0 | 8317 | debugger. Silently skip those. */ |
c906108c SS |
8318 | allsigs = 1; |
8319 | sigfirst = 0; | |
8320 | siglast = nsigs - 1; | |
8321 | } | |
773a1edc | 8322 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8323 | { |
8324 | SET_SIGS (nsigs, sigs, signal_stop); | |
8325 | SET_SIGS (nsigs, sigs, signal_print); | |
8326 | } | |
773a1edc | 8327 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8328 | { |
8329 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8330 | } | |
773a1edc | 8331 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8332 | { |
8333 | SET_SIGS (nsigs, sigs, signal_print); | |
8334 | } | |
773a1edc | 8335 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8336 | { |
8337 | SET_SIGS (nsigs, sigs, signal_program); | |
8338 | } | |
773a1edc | 8339 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8340 | { |
8341 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8342 | } | |
773a1edc | 8343 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8344 | { |
8345 | SET_SIGS (nsigs, sigs, signal_program); | |
8346 | } | |
773a1edc | 8347 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8348 | { |
8349 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8350 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8351 | } | |
773a1edc | 8352 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8353 | { |
8354 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8355 | } | |
8356 | else if (digits > 0) | |
8357 | { | |
8358 | /* It is numeric. The numeric signal refers to our own | |
8359 | internal signal numbering from target.h, not to host/target | |
8360 | signal number. This is a feature; users really should be | |
8361 | using symbolic names anyway, and the common ones like | |
8362 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8363 | ||
8364 | sigfirst = siglast = (int) | |
773a1edc TT |
8365 | gdb_signal_from_command (atoi (arg)); |
8366 | if (arg[digits] == '-') | |
c906108c SS |
8367 | { |
8368 | siglast = (int) | |
773a1edc | 8369 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8370 | } |
8371 | if (sigfirst > siglast) | |
8372 | { | |
1777feb0 | 8373 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8374 | std::swap (sigfirst, siglast); |
c906108c SS |
8375 | } |
8376 | } | |
8377 | else | |
8378 | { | |
773a1edc | 8379 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8380 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8381 | { |
8382 | sigfirst = siglast = (int) oursig; | |
8383 | } | |
8384 | else | |
8385 | { | |
8386 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8387 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8388 | } |
8389 | } | |
8390 | ||
8391 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8392 | which signals to apply actions to. */ |
c906108c | 8393 | |
b926417a | 8394 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8395 | { |
2ea28649 | 8396 | switch ((enum gdb_signal) signum) |
c906108c | 8397 | { |
a493e3e2 PA |
8398 | case GDB_SIGNAL_TRAP: |
8399 | case GDB_SIGNAL_INT: | |
c906108c SS |
8400 | if (!allsigs && !sigs[signum]) |
8401 | { | |
9e2f0ad4 | 8402 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8403 | Are you sure you want to change it? "), |
2ea28649 | 8404 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8405 | { |
8406 | sigs[signum] = 1; | |
8407 | } | |
8408 | else | |
8409 | { | |
a3f17187 | 8410 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8411 | gdb_flush (gdb_stdout); |
8412 | } | |
8413 | } | |
8414 | break; | |
a493e3e2 PA |
8415 | case GDB_SIGNAL_0: |
8416 | case GDB_SIGNAL_DEFAULT: | |
8417 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8418 | /* Make sure that "all" doesn't print these. */ |
8419 | break; | |
8420 | default: | |
8421 | sigs[signum] = 1; | |
8422 | break; | |
8423 | } | |
8424 | } | |
c906108c SS |
8425 | } |
8426 | ||
b926417a | 8427 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8428 | if (sigs[signum]) |
8429 | { | |
2455069d | 8430 | signal_cache_update (-1); |
adc6a863 PA |
8431 | target_pass_signals (signal_pass); |
8432 | target_program_signals (signal_program); | |
c906108c | 8433 | |
3a031f65 PA |
8434 | if (from_tty) |
8435 | { | |
8436 | /* Show the results. */ | |
8437 | sig_print_header (); | |
8438 | for (; signum < nsigs; signum++) | |
8439 | if (sigs[signum]) | |
aead7601 | 8440 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8441 | } |
8442 | ||
8443 | break; | |
8444 | } | |
c906108c SS |
8445 | } |
8446 | ||
de0bea00 MF |
8447 | /* Complete the "handle" command. */ |
8448 | ||
eb3ff9a5 | 8449 | static void |
de0bea00 | 8450 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8451 | completion_tracker &tracker, |
6f937416 | 8452 | const char *text, const char *word) |
de0bea00 | 8453 | { |
de0bea00 MF |
8454 | static const char * const keywords[] = |
8455 | { | |
8456 | "all", | |
8457 | "stop", | |
8458 | "ignore", | |
8459 | "print", | |
8460 | "pass", | |
8461 | "nostop", | |
8462 | "noignore", | |
8463 | "noprint", | |
8464 | "nopass", | |
8465 | NULL, | |
8466 | }; | |
8467 | ||
eb3ff9a5 PA |
8468 | signal_completer (ignore, tracker, text, word); |
8469 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8470 | } |
8471 | ||
2ea28649 PA |
8472 | enum gdb_signal |
8473 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8474 | { |
8475 | if (num >= 1 && num <= 15) | |
2ea28649 | 8476 | return (enum gdb_signal) num; |
ed01b82c PA |
8477 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8478 | Use \"info signals\" for a list of symbolic signals.")); | |
8479 | } | |
8480 | ||
c906108c SS |
8481 | /* Print current contents of the tables set by the handle command. |
8482 | It is possible we should just be printing signals actually used | |
8483 | by the current target (but for things to work right when switching | |
8484 | targets, all signals should be in the signal tables). */ | |
8485 | ||
8486 | static void | |
1d12d88f | 8487 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8488 | { |
2ea28649 | 8489 | enum gdb_signal oursig; |
abbb1732 | 8490 | |
c906108c SS |
8491 | sig_print_header (); |
8492 | ||
8493 | if (signum_exp) | |
8494 | { | |
8495 | /* First see if this is a symbol name. */ | |
2ea28649 | 8496 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8497 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8498 | { |
8499 | /* No, try numeric. */ | |
8500 | oursig = | |
2ea28649 | 8501 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8502 | } |
8503 | sig_print_info (oursig); | |
8504 | return; | |
8505 | } | |
8506 | ||
8507 | printf_filtered ("\n"); | |
8508 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8509 | for (oursig = GDB_SIGNAL_FIRST; |
8510 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8511 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8512 | { |
8513 | QUIT; | |
8514 | ||
a493e3e2 PA |
8515 | if (oursig != GDB_SIGNAL_UNKNOWN |
8516 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8517 | sig_print_info (oursig); |
8518 | } | |
8519 | ||
3e43a32a MS |
8520 | printf_filtered (_("\nUse the \"handle\" command " |
8521 | "to change these tables.\n")); | |
c906108c | 8522 | } |
4aa995e1 PA |
8523 | |
8524 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8525 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8526 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8527 | also dependent on which thread you have selected. |
8528 | ||
8529 | 1. making $_siginfo be an internalvar that creates a new value on | |
8530 | access. | |
8531 | ||
8532 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8533 | ||
8534 | /* This function implements the lval_computed support for reading a | |
8535 | $_siginfo value. */ | |
8536 | ||
8537 | static void | |
8538 | siginfo_value_read (struct value *v) | |
8539 | { | |
8540 | LONGEST transferred; | |
8541 | ||
a911d87a PA |
8542 | /* If we can access registers, so can we access $_siginfo. Likewise |
8543 | vice versa. */ | |
8544 | validate_registers_access (); | |
c709acd1 | 8545 | |
4aa995e1 | 8546 | transferred = |
8b88a78e | 8547 | target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, |
4aa995e1 PA |
8548 | NULL, |
8549 | value_contents_all_raw (v), | |
8550 | value_offset (v), | |
8551 | TYPE_LENGTH (value_type (v))); | |
8552 | ||
8553 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8554 | error (_("Unable to read siginfo")); | |
8555 | } | |
8556 | ||
8557 | /* This function implements the lval_computed support for writing a | |
8558 | $_siginfo value. */ | |
8559 | ||
8560 | static void | |
8561 | siginfo_value_write (struct value *v, struct value *fromval) | |
8562 | { | |
8563 | LONGEST transferred; | |
8564 | ||
a911d87a PA |
8565 | /* If we can access registers, so can we access $_siginfo. Likewise |
8566 | vice versa. */ | |
8567 | validate_registers_access (); | |
c709acd1 | 8568 | |
8b88a78e | 8569 | transferred = target_write (current_top_target (), |
4aa995e1 PA |
8570 | TARGET_OBJECT_SIGNAL_INFO, |
8571 | NULL, | |
8572 | value_contents_all_raw (fromval), | |
8573 | value_offset (v), | |
8574 | TYPE_LENGTH (value_type (fromval))); | |
8575 | ||
8576 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8577 | error (_("Unable to write siginfo")); | |
8578 | } | |
8579 | ||
c8f2448a | 8580 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8581 | { |
8582 | siginfo_value_read, | |
8583 | siginfo_value_write | |
8584 | }; | |
8585 | ||
8586 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8587 | the current thread using architecture GDBARCH. Return a void value |
8588 | if there's no object available. */ | |
4aa995e1 | 8589 | |
2c0b251b | 8590 | static struct value * |
22d2b532 SDJ |
8591 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8592 | void *ignore) | |
4aa995e1 | 8593 | { |
4aa995e1 | 8594 | if (target_has_stack |
d7e15655 | 8595 | && inferior_ptid != null_ptid |
78267919 | 8596 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 8597 | { |
78267919 | 8598 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8599 | |
78267919 | 8600 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8601 | } |
8602 | ||
78267919 | 8603 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8604 | } |
8605 | ||
c906108c | 8606 | \f |
16c381f0 JK |
8607 | /* infcall_suspend_state contains state about the program itself like its |
8608 | registers and any signal it received when it last stopped. | |
8609 | This state must be restored regardless of how the inferior function call | |
8610 | ends (either successfully, or after it hits a breakpoint or signal) | |
8611 | if the program is to properly continue where it left off. */ | |
8612 | ||
6bf78e29 | 8613 | class infcall_suspend_state |
7a292a7a | 8614 | { |
6bf78e29 AB |
8615 | public: |
8616 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
8617 | once the inferior function call has finished. */ | |
8618 | infcall_suspend_state (struct gdbarch *gdbarch, | |
8619 | const struct thread_info *tp, | |
8620 | struct regcache *regcache) | |
8621 | : m_thread_suspend (tp->suspend), | |
8622 | m_registers (new readonly_detached_regcache (*regcache)) | |
8623 | { | |
8624 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
8625 | ||
8626 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8627 | { | |
8628 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8629 | size_t len = TYPE_LENGTH (type); | |
8630 | ||
8631 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); | |
8632 | ||
8633 | if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8634 | siginfo_data.get (), 0, len) != len) | |
8635 | { | |
8636 | /* Errors ignored. */ | |
8637 | siginfo_data.reset (nullptr); | |
8638 | } | |
8639 | } | |
8640 | ||
8641 | if (siginfo_data) | |
8642 | { | |
8643 | m_siginfo_gdbarch = gdbarch; | |
8644 | m_siginfo_data = std::move (siginfo_data); | |
8645 | } | |
8646 | } | |
8647 | ||
8648 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 8649 | |
6bf78e29 AB |
8650 | readonly_detached_regcache *registers () const |
8651 | { | |
8652 | return m_registers.get (); | |
8653 | } | |
8654 | ||
8655 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
8656 | ||
8657 | void restore (struct gdbarch *gdbarch, | |
8658 | struct thread_info *tp, | |
8659 | struct regcache *regcache) const | |
8660 | { | |
8661 | tp->suspend = m_thread_suspend; | |
8662 | ||
8663 | if (m_siginfo_gdbarch == gdbarch) | |
8664 | { | |
8665 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8666 | ||
8667 | /* Errors ignored. */ | |
8668 | target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8669 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); | |
8670 | } | |
8671 | ||
8672 | /* The inferior can be gone if the user types "print exit(0)" | |
8673 | (and perhaps other times). */ | |
8674 | if (target_has_execution) | |
8675 | /* NB: The register write goes through to the target. */ | |
8676 | regcache->restore (registers ()); | |
8677 | } | |
8678 | ||
8679 | private: | |
8680 | /* How the current thread stopped before the inferior function call was | |
8681 | executed. */ | |
8682 | struct thread_suspend_state m_thread_suspend; | |
8683 | ||
8684 | /* The registers before the inferior function call was executed. */ | |
8685 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 8686 | |
35515841 | 8687 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 8688 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
8689 | |
8690 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8691 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8692 | content would be invalid. */ | |
6bf78e29 | 8693 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
8694 | }; |
8695 | ||
cb524840 TT |
8696 | infcall_suspend_state_up |
8697 | save_infcall_suspend_state () | |
b89667eb | 8698 | { |
b89667eb | 8699 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 8700 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8701 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 8702 | |
6bf78e29 AB |
8703 | infcall_suspend_state_up inf_state |
8704 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 8705 | |
6bf78e29 AB |
8706 | /* Having saved the current state, adjust the thread state, discarding |
8707 | any stop signal information. The stop signal is not useful when | |
8708 | starting an inferior function call, and run_inferior_call will not use | |
8709 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 8710 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 8711 | |
b89667eb DE |
8712 | return inf_state; |
8713 | } | |
8714 | ||
8715 | /* Restore inferior session state to INF_STATE. */ | |
8716 | ||
8717 | void | |
16c381f0 | 8718 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8719 | { |
8720 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 8721 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8722 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 8723 | |
6bf78e29 | 8724 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 8725 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8726 | } |
8727 | ||
b89667eb | 8728 | void |
16c381f0 | 8729 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 8730 | { |
dd848631 | 8731 | delete inf_state; |
b89667eb DE |
8732 | } |
8733 | ||
daf6667d | 8734 | readonly_detached_regcache * |
16c381f0 | 8735 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 8736 | { |
6bf78e29 | 8737 | return inf_state->registers (); |
b89667eb DE |
8738 | } |
8739 | ||
16c381f0 JK |
8740 | /* infcall_control_state contains state regarding gdb's control of the |
8741 | inferior itself like stepping control. It also contains session state like | |
8742 | the user's currently selected frame. */ | |
b89667eb | 8743 | |
16c381f0 | 8744 | struct infcall_control_state |
b89667eb | 8745 | { |
16c381f0 JK |
8746 | struct thread_control_state thread_control; |
8747 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
8748 | |
8749 | /* Other fields: */ | |
ee841dd8 TT |
8750 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
8751 | int stopped_by_random_signal = 0; | |
7a292a7a | 8752 | |
b89667eb | 8753 | /* ID if the selected frame when the inferior function call was made. */ |
ee841dd8 | 8754 | struct frame_id selected_frame_id {}; |
7a292a7a SS |
8755 | }; |
8756 | ||
c906108c | 8757 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 8758 | connection. */ |
c906108c | 8759 | |
cb524840 TT |
8760 | infcall_control_state_up |
8761 | save_infcall_control_state () | |
c906108c | 8762 | { |
cb524840 | 8763 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 8764 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8765 | struct inferior *inf = current_inferior (); |
7a292a7a | 8766 | |
16c381f0 JK |
8767 | inf_status->thread_control = tp->control; |
8768 | inf_status->inferior_control = inf->control; | |
d82142e2 | 8769 | |
8358c15c | 8770 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 8771 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 8772 | |
16c381f0 JK |
8773 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
8774 | chain. If caller's caller is walking the chain, they'll be happier if we | |
8775 | hand them back the original chain when restore_infcall_control_state is | |
8776 | called. */ | |
8777 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
8778 | |
8779 | /* Other fields: */ | |
8780 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
8781 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 8782 | |
206415a3 | 8783 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 8784 | |
7a292a7a | 8785 | return inf_status; |
c906108c SS |
8786 | } |
8787 | ||
bf469271 PA |
8788 | static void |
8789 | restore_selected_frame (const frame_id &fid) | |
c906108c | 8790 | { |
bf469271 | 8791 | frame_info *frame = frame_find_by_id (fid); |
c906108c | 8792 | |
aa0cd9c1 AC |
8793 | /* If inf_status->selected_frame_id is NULL, there was no previously |
8794 | selected frame. */ | |
101dcfbe | 8795 | if (frame == NULL) |
c906108c | 8796 | { |
8a3fe4f8 | 8797 | warning (_("Unable to restore previously selected frame.")); |
bf469271 | 8798 | return; |
c906108c SS |
8799 | } |
8800 | ||
0f7d239c | 8801 | select_frame (frame); |
c906108c SS |
8802 | } |
8803 | ||
b89667eb DE |
8804 | /* Restore inferior session state to INF_STATUS. */ |
8805 | ||
c906108c | 8806 | void |
16c381f0 | 8807 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 8808 | { |
4e1c45ea | 8809 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8810 | struct inferior *inf = current_inferior (); |
4e1c45ea | 8811 | |
8358c15c JK |
8812 | if (tp->control.step_resume_breakpoint) |
8813 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
8814 | ||
5b79abe7 TT |
8815 | if (tp->control.exception_resume_breakpoint) |
8816 | tp->control.exception_resume_breakpoint->disposition | |
8817 | = disp_del_at_next_stop; | |
8818 | ||
d82142e2 | 8819 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 8820 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 8821 | |
16c381f0 JK |
8822 | tp->control = inf_status->thread_control; |
8823 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
8824 | |
8825 | /* Other fields: */ | |
8826 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
8827 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 8828 | |
b89667eb | 8829 | if (target_has_stack) |
c906108c | 8830 | { |
bf469271 | 8831 | /* The point of the try/catch is that if the stack is clobbered, |
101dcfbe AC |
8832 | walking the stack might encounter a garbage pointer and |
8833 | error() trying to dereference it. */ | |
bf469271 PA |
8834 | TRY |
8835 | { | |
8836 | restore_selected_frame (inf_status->selected_frame_id); | |
8837 | } | |
8838 | CATCH (ex, RETURN_MASK_ERROR) | |
8839 | { | |
8840 | exception_fprintf (gdb_stderr, ex, | |
8841 | "Unable to restore previously selected frame:\n"); | |
8842 | /* Error in restoring the selected frame. Select the | |
8843 | innermost frame. */ | |
8844 | select_frame (get_current_frame ()); | |
8845 | } | |
8846 | END_CATCH | |
c906108c | 8847 | } |
c906108c | 8848 | |
ee841dd8 | 8849 | delete inf_status; |
7a292a7a | 8850 | } |
c906108c SS |
8851 | |
8852 | void | |
16c381f0 | 8853 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 8854 | { |
8358c15c JK |
8855 | if (inf_status->thread_control.step_resume_breakpoint) |
8856 | inf_status->thread_control.step_resume_breakpoint->disposition | |
8857 | = disp_del_at_next_stop; | |
8858 | ||
5b79abe7 TT |
8859 | if (inf_status->thread_control.exception_resume_breakpoint) |
8860 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
8861 | = disp_del_at_next_stop; | |
8862 | ||
1777feb0 | 8863 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 8864 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 8865 | |
ee841dd8 | 8866 | delete inf_status; |
7a292a7a | 8867 | } |
b89667eb | 8868 | \f |
7f89fd65 | 8869 | /* See infrun.h. */ |
0c557179 SDJ |
8870 | |
8871 | void | |
8872 | clear_exit_convenience_vars (void) | |
8873 | { | |
8874 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
8875 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
8876 | } | |
c5aa993b | 8877 | \f |
488f131b | 8878 | |
b2175913 MS |
8879 | /* User interface for reverse debugging: |
8880 | Set exec-direction / show exec-direction commands | |
8881 | (returns error unless target implements to_set_exec_direction method). */ | |
8882 | ||
170742de | 8883 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
8884 | static const char exec_forward[] = "forward"; |
8885 | static const char exec_reverse[] = "reverse"; | |
8886 | static const char *exec_direction = exec_forward; | |
40478521 | 8887 | static const char *const exec_direction_names[] = { |
b2175913 MS |
8888 | exec_forward, |
8889 | exec_reverse, | |
8890 | NULL | |
8891 | }; | |
8892 | ||
8893 | static void | |
eb4c3f4a | 8894 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
8895 | struct cmd_list_element *cmd) |
8896 | { | |
8897 | if (target_can_execute_reverse) | |
8898 | { | |
8899 | if (!strcmp (exec_direction, exec_forward)) | |
8900 | execution_direction = EXEC_FORWARD; | |
8901 | else if (!strcmp (exec_direction, exec_reverse)) | |
8902 | execution_direction = EXEC_REVERSE; | |
8903 | } | |
8bbed405 MS |
8904 | else |
8905 | { | |
8906 | exec_direction = exec_forward; | |
8907 | error (_("Target does not support this operation.")); | |
8908 | } | |
b2175913 MS |
8909 | } |
8910 | ||
8911 | static void | |
8912 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
8913 | struct cmd_list_element *cmd, const char *value) | |
8914 | { | |
8915 | switch (execution_direction) { | |
8916 | case EXEC_FORWARD: | |
8917 | fprintf_filtered (out, _("Forward.\n")); | |
8918 | break; | |
8919 | case EXEC_REVERSE: | |
8920 | fprintf_filtered (out, _("Reverse.\n")); | |
8921 | break; | |
b2175913 | 8922 | default: |
d8b34453 PA |
8923 | internal_error (__FILE__, __LINE__, |
8924 | _("bogus execution_direction value: %d"), | |
8925 | (int) execution_direction); | |
b2175913 MS |
8926 | } |
8927 | } | |
8928 | ||
d4db2f36 PA |
8929 | static void |
8930 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
8931 | struct cmd_list_element *c, const char *value) | |
8932 | { | |
3e43a32a MS |
8933 | fprintf_filtered (file, _("Resuming the execution of threads " |
8934 | "of all processes is %s.\n"), value); | |
d4db2f36 | 8935 | } |
ad52ddc6 | 8936 | |
22d2b532 SDJ |
8937 | /* Implementation of `siginfo' variable. */ |
8938 | ||
8939 | static const struct internalvar_funcs siginfo_funcs = | |
8940 | { | |
8941 | siginfo_make_value, | |
8942 | NULL, | |
8943 | NULL | |
8944 | }; | |
8945 | ||
372316f1 PA |
8946 | /* Callback for infrun's target events source. This is marked when a |
8947 | thread has a pending status to process. */ | |
8948 | ||
8949 | static void | |
8950 | infrun_async_inferior_event_handler (gdb_client_data data) | |
8951 | { | |
372316f1 PA |
8952 | inferior_event_handler (INF_REG_EVENT, NULL); |
8953 | } | |
8954 | ||
c906108c | 8955 | void |
96baa820 | 8956 | _initialize_infrun (void) |
c906108c | 8957 | { |
de0bea00 | 8958 | struct cmd_list_element *c; |
c906108c | 8959 | |
372316f1 PA |
8960 | /* Register extra event sources in the event loop. */ |
8961 | infrun_async_inferior_event_token | |
8962 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
8963 | ||
11db9430 | 8964 | add_info ("signals", info_signals_command, _("\ |
1bedd215 AC |
8965 | What debugger does when program gets various signals.\n\ |
8966 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
8967 | add_info_alias ("handle", "signals", 0); |
8968 | ||
de0bea00 | 8969 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 8970 | Specify how to handle signals.\n\ |
486c7739 | 8971 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 8972 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 8973 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
8974 | will be displayed instead.\n\ |
8975 | \n\ | |
c906108c SS |
8976 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
8977 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
8978 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
8979 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 8980 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 8981 | \n\ |
1bedd215 | 8982 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
8983 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
8984 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
8985 | Print means print a message if this signal happens.\n\ | |
8986 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
8987 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
8988 | Pass and Stop may be combined.\n\ |
8989 | \n\ | |
8990 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
8991 | may be interspersed with actions, with the actions being performed for\n\ | |
8992 | all signals cumulatively specified.")); | |
de0bea00 | 8993 | set_cmd_completer (c, handle_completer); |
486c7739 | 8994 | |
c906108c | 8995 | if (!dbx_commands) |
1a966eab AC |
8996 | stop_command = add_cmd ("stop", class_obscure, |
8997 | not_just_help_class_command, _("\ | |
8998 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 8999 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9000 | of the program stops."), &cmdlist); |
c906108c | 9001 | |
ccce17b0 | 9002 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9003 | Set inferior debugging."), _("\ |
9004 | Show inferior debugging."), _("\ | |
9005 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9006 | NULL, |
9007 | show_debug_infrun, | |
9008 | &setdebuglist, &showdebuglist); | |
527159b7 | 9009 | |
3e43a32a MS |
9010 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9011 | &debug_displaced, _("\ | |
237fc4c9 PA |
9012 | Set displaced stepping debugging."), _("\ |
9013 | Show displaced stepping debugging."), _("\ | |
9014 | When non-zero, displaced stepping specific debugging is enabled."), | |
9015 | NULL, | |
9016 | show_debug_displaced, | |
9017 | &setdebuglist, &showdebuglist); | |
9018 | ||
ad52ddc6 PA |
9019 | add_setshow_boolean_cmd ("non-stop", no_class, |
9020 | &non_stop_1, _("\ | |
9021 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9022 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9023 | When debugging a multi-threaded program and this setting is\n\ | |
9024 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9025 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9026 | all other threads in the program while you interact with the thread of\n\ | |
9027 | interest. When you continue or step a thread, you can allow the other\n\ | |
9028 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9029 | thread's state, all threads stop.\n\ | |
9030 | \n\ | |
9031 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9032 | to run freely. You'll be able to step each thread independently,\n\ | |
9033 | leave it stopped or free to run as needed."), | |
9034 | set_non_stop, | |
9035 | show_non_stop, | |
9036 | &setlist, | |
9037 | &showlist); | |
9038 | ||
adc6a863 | 9039 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9040 | { |
9041 | signal_stop[i] = 1; | |
9042 | signal_print[i] = 1; | |
9043 | signal_program[i] = 1; | |
ab04a2af | 9044 | signal_catch[i] = 0; |
c906108c SS |
9045 | } |
9046 | ||
4d9d9d04 PA |
9047 | /* Signals caused by debugger's own actions should not be given to |
9048 | the program afterwards. | |
9049 | ||
9050 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9051 | explicitly specifies that it should be delivered to the target | |
9052 | program. Typically, that would occur when a user is debugging a | |
9053 | target monitor on a simulator: the target monitor sets a | |
9054 | breakpoint; the simulator encounters this breakpoint and halts | |
9055 | the simulation handing control to GDB; GDB, noting that the stop | |
9056 | address doesn't map to any known breakpoint, returns control back | |
9057 | to the simulator; the simulator then delivers the hardware | |
9058 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9059 | debugged. */ | |
a493e3e2 PA |
9060 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9061 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9062 | |
9063 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9064 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9065 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9066 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9067 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9068 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9069 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9070 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9071 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9072 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9073 | signal_print[GDB_SIGNAL_IO] = 0; | |
9074 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9075 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9076 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9077 | signal_print[GDB_SIGNAL_URG] = 0; | |
9078 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9079 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9080 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9081 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9082 | |
cd0fc7c3 SS |
9083 | /* These signals are used internally by user-level thread |
9084 | implementations. (See signal(5) on Solaris.) Like the above | |
9085 | signals, a healthy program receives and handles them as part of | |
9086 | its normal operation. */ | |
a493e3e2 PA |
9087 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9088 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9089 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9090 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9091 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9092 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9093 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9094 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9095 | |
2455069d UW |
9096 | /* Update cached state. */ |
9097 | signal_cache_update (-1); | |
9098 | ||
85c07804 AC |
9099 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9100 | &stop_on_solib_events, _("\ | |
9101 | Set stopping for shared library events."), _("\ | |
9102 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9103 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9104 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9105 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9106 | set_stop_on_solib_events, |
920d2a44 | 9107 | show_stop_on_solib_events, |
85c07804 | 9108 | &setlist, &showlist); |
c906108c | 9109 | |
7ab04401 AC |
9110 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9111 | follow_fork_mode_kind_names, | |
9112 | &follow_fork_mode_string, _("\ | |
9113 | Set debugger response to a program call of fork or vfork."), _("\ | |
9114 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9115 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9116 | parent - the original process is debugged after a fork\n\ | |
9117 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9118 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9119 | By default, the debugger will follow the parent process."), |
9120 | NULL, | |
920d2a44 | 9121 | show_follow_fork_mode_string, |
7ab04401 AC |
9122 | &setlist, &showlist); |
9123 | ||
6c95b8df PA |
9124 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9125 | follow_exec_mode_names, | |
9126 | &follow_exec_mode_string, _("\ | |
9127 | Set debugger response to a program call of exec."), _("\ | |
9128 | Show debugger response to a program call of exec."), _("\ | |
9129 | An exec call replaces the program image of a process.\n\ | |
9130 | \n\ | |
9131 | follow-exec-mode can be:\n\ | |
9132 | \n\ | |
cce7e648 | 9133 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9134 | to this new inferior. The program the process was running before\n\ |
9135 | the exec call can be restarted afterwards by restarting the original\n\ | |
9136 | inferior.\n\ | |
9137 | \n\ | |
9138 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9139 | The new executable image replaces the previous executable loaded in\n\ | |
9140 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9141 | the executable the process was running after the exec call.\n\ | |
9142 | \n\ | |
9143 | By default, the debugger will use the same inferior."), | |
9144 | NULL, | |
9145 | show_follow_exec_mode_string, | |
9146 | &setlist, &showlist); | |
9147 | ||
7ab04401 AC |
9148 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9149 | scheduler_enums, &scheduler_mode, _("\ | |
9150 | Set mode for locking scheduler during execution."), _("\ | |
9151 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9152 | off == no locking (threads may preempt at any time)\n\ |
9153 | on == full locking (no thread except the current thread may run)\n\ | |
9154 | This applies to both normal execution and replay mode.\n\ | |
9155 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9156 | In this mode, other threads may run during other commands.\n\ | |
9157 | This applies to both normal execution and replay mode.\n\ | |
9158 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9159 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9160 | show_scheduler_mode, |
7ab04401 | 9161 | &setlist, &showlist); |
5fbbeb29 | 9162 | |
d4db2f36 PA |
9163 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9164 | Set mode for resuming threads of all processes."), _("\ | |
9165 | Show mode for resuming threads of all processes."), _("\ | |
9166 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9167 | threads of all processes. When off (which is the default), execution\n\ | |
9168 | commands only resume the threads of the current process. The set of\n\ | |
9169 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9170 | mode (see help set scheduler-locking)."), | |
9171 | NULL, | |
9172 | show_schedule_multiple, | |
9173 | &setlist, &showlist); | |
9174 | ||
5bf193a2 AC |
9175 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9176 | Set mode of the step operation."), _("\ | |
9177 | Show mode of the step operation."), _("\ | |
9178 | When set, doing a step over a function without debug line information\n\ | |
9179 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9180 | function is skipped and the step command stops at a different source line."), | |
9181 | NULL, | |
920d2a44 | 9182 | show_step_stop_if_no_debug, |
5bf193a2 | 9183 | &setlist, &showlist); |
ca6724c1 | 9184 | |
72d0e2c5 YQ |
9185 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9186 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9187 | Set debugger's willingness to use displaced stepping."), _("\ |
9188 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9189 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9190 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9191 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9192 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9193 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9194 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9195 | NULL, |
9196 | show_can_use_displaced_stepping, | |
9197 | &setlist, &showlist); | |
237fc4c9 | 9198 | |
b2175913 MS |
9199 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9200 | &exec_direction, _("Set direction of execution.\n\ | |
9201 | Options are 'forward' or 'reverse'."), | |
9202 | _("Show direction of execution (forward/reverse)."), | |
9203 | _("Tells gdb whether to execute forward or backward."), | |
9204 | set_exec_direction_func, show_exec_direction_func, | |
9205 | &setlist, &showlist); | |
9206 | ||
6c95b8df PA |
9207 | /* Set/show detach-on-fork: user-settable mode. */ |
9208 | ||
9209 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9210 | Set whether gdb will detach the child of a fork."), _("\ | |
9211 | Show whether gdb will detach the child of a fork."), _("\ | |
9212 | Tells gdb whether to detach the child of a fork."), | |
9213 | NULL, NULL, &setlist, &showlist); | |
9214 | ||
03583c20 UW |
9215 | /* Set/show disable address space randomization mode. */ |
9216 | ||
9217 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9218 | &disable_randomization, _("\ | |
9219 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9220 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9221 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9222 | address space is disabled. Standalone programs run with the randomization\n\ | |
9223 | enabled by default on some platforms."), | |
9224 | &set_disable_randomization, | |
9225 | &show_disable_randomization, | |
9226 | &setlist, &showlist); | |
9227 | ||
ca6724c1 | 9228 | /* ptid initializations */ |
ca6724c1 KB |
9229 | inferior_ptid = null_ptid; |
9230 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9231 | |
76727919 TT |
9232 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed); |
9233 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested); | |
9234 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit); | |
9235 | gdb::observers::inferior_exit.attach (infrun_inferior_exit); | |
4aa995e1 PA |
9236 | |
9237 | /* Explicitly create without lookup, since that tries to create a | |
9238 | value with a void typed value, and when we get here, gdbarch | |
9239 | isn't initialized yet. At this point, we're quite sure there | |
9240 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9241 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9242 | |
9243 | add_setshow_boolean_cmd ("observer", no_class, | |
9244 | &observer_mode_1, _("\ | |
9245 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9246 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9247 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9248 | affect its execution. Registers and memory may not be changed,\n\ | |
9249 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9250 | or signalled."), | |
9251 | set_observer_mode, | |
9252 | show_observer_mode, | |
9253 | &setlist, | |
9254 | &showlist); | |
c906108c | 9255 | } |