Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
618f726f | 4 | Copyright (C) 1986-2016 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" | |
03f2053f | 28 | #include "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" |
06600e06 | 41 | #include "observer.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" |
c906108c SS |
67 | |
68 | /* Prototypes for local functions */ | |
69 | ||
96baa820 | 70 | static void signals_info (char *, int); |
c906108c | 71 | |
96baa820 | 72 | static void handle_command (char *, int); |
c906108c | 73 | |
2ea28649 | 74 | static void sig_print_info (enum gdb_signal); |
c906108c | 75 | |
96baa820 | 76 | static void sig_print_header (void); |
c906108c | 77 | |
74b7792f | 78 | static void resume_cleanups (void *); |
c906108c | 79 | |
96baa820 | 80 | static int hook_stop_stub (void *); |
c906108c | 81 | |
96baa820 JM |
82 | static int restore_selected_frame (void *); |
83 | ||
4ef3f3be | 84 | static int follow_fork (void); |
96baa820 | 85 | |
d83ad864 DB |
86 | static int follow_fork_inferior (int follow_child, int detach_fork); |
87 | ||
88 | static void follow_inferior_reset_breakpoints (void); | |
89 | ||
96baa820 | 90 | static void set_schedlock_func (char *args, int from_tty, |
488f131b | 91 | struct cmd_list_element *c); |
96baa820 | 92 | |
a289b8f6 JK |
93 | static int currently_stepping (struct thread_info *tp); |
94 | ||
96baa820 | 95 | void _initialize_infrun (void); |
43ff13b4 | 96 | |
e58b0e63 PA |
97 | void nullify_last_target_wait_ptid (void); |
98 | ||
2c03e5be | 99 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
100 | |
101 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
102 | ||
2484c66b UW |
103 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
104 | ||
8550d3b3 YQ |
105 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
106 | ||
372316f1 PA |
107 | /* Asynchronous signal handler registered as event loop source for |
108 | when we have pending events ready to be passed to the core. */ | |
109 | static struct async_event_handler *infrun_async_inferior_event_token; | |
110 | ||
111 | /* Stores whether infrun_async was previously enabled or disabled. | |
112 | Starts off as -1, indicating "never enabled/disabled". */ | |
113 | static int infrun_is_async = -1; | |
114 | ||
115 | /* See infrun.h. */ | |
116 | ||
117 | void | |
118 | infrun_async (int enable) | |
119 | { | |
120 | if (infrun_is_async != enable) | |
121 | { | |
122 | infrun_is_async = enable; | |
123 | ||
124 | if (debug_infrun) | |
125 | fprintf_unfiltered (gdb_stdlog, | |
126 | "infrun: infrun_async(%d)\n", | |
127 | enable); | |
128 | ||
129 | if (enable) | |
130 | mark_async_event_handler (infrun_async_inferior_event_token); | |
131 | else | |
132 | clear_async_event_handler (infrun_async_inferior_event_token); | |
133 | } | |
134 | } | |
135 | ||
0b333c5e PA |
136 | /* See infrun.h. */ |
137 | ||
138 | void | |
139 | mark_infrun_async_event_handler (void) | |
140 | { | |
141 | mark_async_event_handler (infrun_async_inferior_event_token); | |
142 | } | |
143 | ||
5fbbeb29 CF |
144 | /* When set, stop the 'step' command if we enter a function which has |
145 | no line number information. The normal behavior is that we step | |
146 | over such function. */ | |
147 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
148 | static void |
149 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
150 | struct cmd_list_element *c, const char *value) | |
151 | { | |
152 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
153 | } | |
5fbbeb29 | 154 | |
1777feb0 | 155 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 156 | |
43ff13b4 JM |
157 | int sync_execution = 0; |
158 | ||
b9f437de PA |
159 | /* proceed and normal_stop use this to notify the user when the |
160 | inferior stopped in a different thread than it had been running | |
161 | in. */ | |
96baa820 | 162 | |
39f77062 | 163 | static ptid_t previous_inferior_ptid; |
7a292a7a | 164 | |
07107ca6 LM |
165 | /* If set (default for legacy reasons), when following a fork, GDB |
166 | will detach from one of the fork branches, child or parent. | |
167 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
168 | setting. */ | |
169 | ||
170 | static int detach_fork = 1; | |
6c95b8df | 171 | |
237fc4c9 PA |
172 | int debug_displaced = 0; |
173 | static void | |
174 | show_debug_displaced (struct ui_file *file, int from_tty, | |
175 | struct cmd_list_element *c, const char *value) | |
176 | { | |
177 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
178 | } | |
179 | ||
ccce17b0 | 180 | unsigned int debug_infrun = 0; |
920d2a44 AC |
181 | static void |
182 | show_debug_infrun (struct ui_file *file, int from_tty, | |
183 | struct cmd_list_element *c, const char *value) | |
184 | { | |
185 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
186 | } | |
527159b7 | 187 | |
03583c20 UW |
188 | |
189 | /* Support for disabling address space randomization. */ | |
190 | ||
191 | int disable_randomization = 1; | |
192 | ||
193 | static void | |
194 | show_disable_randomization (struct ui_file *file, int from_tty, | |
195 | struct cmd_list_element *c, const char *value) | |
196 | { | |
197 | if (target_supports_disable_randomization ()) | |
198 | fprintf_filtered (file, | |
199 | _("Disabling randomization of debuggee's " | |
200 | "virtual address space is %s.\n"), | |
201 | value); | |
202 | else | |
203 | fputs_filtered (_("Disabling randomization of debuggee's " | |
204 | "virtual address space is unsupported on\n" | |
205 | "this platform.\n"), file); | |
206 | } | |
207 | ||
208 | static void | |
209 | set_disable_randomization (char *args, int from_tty, | |
210 | struct cmd_list_element *c) | |
211 | { | |
212 | if (!target_supports_disable_randomization ()) | |
213 | error (_("Disabling randomization of debuggee's " | |
214 | "virtual address space is unsupported on\n" | |
215 | "this platform.")); | |
216 | } | |
217 | ||
d32dc48e PA |
218 | /* User interface for non-stop mode. */ |
219 | ||
220 | int non_stop = 0; | |
221 | static int non_stop_1 = 0; | |
222 | ||
223 | static void | |
224 | set_non_stop (char *args, int from_tty, | |
225 | struct cmd_list_element *c) | |
226 | { | |
227 | if (target_has_execution) | |
228 | { | |
229 | non_stop_1 = non_stop; | |
230 | error (_("Cannot change this setting while the inferior is running.")); | |
231 | } | |
232 | ||
233 | non_stop = non_stop_1; | |
234 | } | |
235 | ||
236 | static void | |
237 | show_non_stop (struct ui_file *file, int from_tty, | |
238 | struct cmd_list_element *c, const char *value) | |
239 | { | |
240 | fprintf_filtered (file, | |
241 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
242 | value); | |
243 | } | |
244 | ||
d914c394 SS |
245 | /* "Observer mode" is somewhat like a more extreme version of |
246 | non-stop, in which all GDB operations that might affect the | |
247 | target's execution have been disabled. */ | |
248 | ||
d914c394 SS |
249 | int observer_mode = 0; |
250 | static int observer_mode_1 = 0; | |
251 | ||
252 | static void | |
253 | set_observer_mode (char *args, int from_tty, | |
254 | struct cmd_list_element *c) | |
255 | { | |
d914c394 SS |
256 | if (target_has_execution) |
257 | { | |
258 | observer_mode_1 = observer_mode; | |
259 | error (_("Cannot change this setting while the inferior is running.")); | |
260 | } | |
261 | ||
262 | observer_mode = observer_mode_1; | |
263 | ||
264 | may_write_registers = !observer_mode; | |
265 | may_write_memory = !observer_mode; | |
266 | may_insert_breakpoints = !observer_mode; | |
267 | may_insert_tracepoints = !observer_mode; | |
268 | /* We can insert fast tracepoints in or out of observer mode, | |
269 | but enable them if we're going into this mode. */ | |
270 | if (observer_mode) | |
271 | may_insert_fast_tracepoints = 1; | |
272 | may_stop = !observer_mode; | |
273 | update_target_permissions (); | |
274 | ||
275 | /* Going *into* observer mode we must force non-stop, then | |
276 | going out we leave it that way. */ | |
277 | if (observer_mode) | |
278 | { | |
d914c394 SS |
279 | pagination_enabled = 0; |
280 | non_stop = non_stop_1 = 1; | |
281 | } | |
282 | ||
283 | if (from_tty) | |
284 | printf_filtered (_("Observer mode is now %s.\n"), | |
285 | (observer_mode ? "on" : "off")); | |
286 | } | |
287 | ||
288 | static void | |
289 | show_observer_mode (struct ui_file *file, int from_tty, | |
290 | struct cmd_list_element *c, const char *value) | |
291 | { | |
292 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
293 | } | |
294 | ||
295 | /* This updates the value of observer mode based on changes in | |
296 | permissions. Note that we are deliberately ignoring the values of | |
297 | may-write-registers and may-write-memory, since the user may have | |
298 | reason to enable these during a session, for instance to turn on a | |
299 | debugging-related global. */ | |
300 | ||
301 | void | |
302 | update_observer_mode (void) | |
303 | { | |
304 | int newval; | |
305 | ||
306 | newval = (!may_insert_breakpoints | |
307 | && !may_insert_tracepoints | |
308 | && may_insert_fast_tracepoints | |
309 | && !may_stop | |
310 | && non_stop); | |
311 | ||
312 | /* Let the user know if things change. */ | |
313 | if (newval != observer_mode) | |
314 | printf_filtered (_("Observer mode is now %s.\n"), | |
315 | (newval ? "on" : "off")); | |
316 | ||
317 | observer_mode = observer_mode_1 = newval; | |
318 | } | |
c2c6d25f | 319 | |
c906108c SS |
320 | /* Tables of how to react to signals; the user sets them. */ |
321 | ||
322 | static unsigned char *signal_stop; | |
323 | static unsigned char *signal_print; | |
324 | static unsigned char *signal_program; | |
325 | ||
ab04a2af TT |
326 | /* Table of signals that are registered with "catch signal". A |
327 | non-zero entry indicates that the signal is caught by some "catch | |
328 | signal" command. This has size GDB_SIGNAL_LAST, to accommodate all | |
329 | signals. */ | |
330 | static unsigned char *signal_catch; | |
331 | ||
2455069d UW |
332 | /* Table of signals that the target may silently handle. |
333 | This is automatically determined from the flags above, | |
334 | and simply cached here. */ | |
335 | static unsigned char *signal_pass; | |
336 | ||
c906108c SS |
337 | #define SET_SIGS(nsigs,sigs,flags) \ |
338 | do { \ | |
339 | int signum = (nsigs); \ | |
340 | while (signum-- > 0) \ | |
341 | if ((sigs)[signum]) \ | |
342 | (flags)[signum] = 1; \ | |
343 | } while (0) | |
344 | ||
345 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
346 | do { \ | |
347 | int signum = (nsigs); \ | |
348 | while (signum-- > 0) \ | |
349 | if ((sigs)[signum]) \ | |
350 | (flags)[signum] = 0; \ | |
351 | } while (0) | |
352 | ||
9b224c5e PA |
353 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
354 | this function is to avoid exporting `signal_program'. */ | |
355 | ||
356 | void | |
357 | update_signals_program_target (void) | |
358 | { | |
a493e3e2 | 359 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); |
9b224c5e PA |
360 | } |
361 | ||
1777feb0 | 362 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 363 | |
edb3359d | 364 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
365 | |
366 | /* Command list pointer for the "stop" placeholder. */ | |
367 | ||
368 | static struct cmd_list_element *stop_command; | |
369 | ||
c906108c SS |
370 | /* Nonzero if we want to give control to the user when we're notified |
371 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 372 | int stop_on_solib_events; |
f9e14852 GB |
373 | |
374 | /* Enable or disable optional shared library event breakpoints | |
375 | as appropriate when the above flag is changed. */ | |
376 | ||
377 | static void | |
378 | set_stop_on_solib_events (char *args, int from_tty, struct cmd_list_element *c) | |
379 | { | |
380 | update_solib_breakpoints (); | |
381 | } | |
382 | ||
920d2a44 AC |
383 | static void |
384 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
385 | struct cmd_list_element *c, const char *value) | |
386 | { | |
387 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
388 | value); | |
389 | } | |
c906108c | 390 | |
c906108c SS |
391 | /* Nonzero after stop if current stack frame should be printed. */ |
392 | ||
393 | static int stop_print_frame; | |
394 | ||
e02bc4cc | 395 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
396 | returned by target_wait()/deprecated_target_wait_hook(). This |
397 | information is returned by get_last_target_status(). */ | |
39f77062 | 398 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
399 | static struct target_waitstatus target_last_waitstatus; |
400 | ||
0d1e5fa7 PA |
401 | static void context_switch (ptid_t ptid); |
402 | ||
4e1c45ea | 403 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 404 | |
53904c9e AC |
405 | static const char follow_fork_mode_child[] = "child"; |
406 | static const char follow_fork_mode_parent[] = "parent"; | |
407 | ||
40478521 | 408 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
409 | follow_fork_mode_child, |
410 | follow_fork_mode_parent, | |
411 | NULL | |
ef346e04 | 412 | }; |
c906108c | 413 | |
53904c9e | 414 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
415 | static void |
416 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
417 | struct cmd_list_element *c, const char *value) | |
418 | { | |
3e43a32a MS |
419 | fprintf_filtered (file, |
420 | _("Debugger response to a program " | |
421 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
422 | value); |
423 | } | |
c906108c SS |
424 | \f |
425 | ||
d83ad864 DB |
426 | /* Handle changes to the inferior list based on the type of fork, |
427 | which process is being followed, and whether the other process | |
428 | should be detached. On entry inferior_ptid must be the ptid of | |
429 | the fork parent. At return inferior_ptid is the ptid of the | |
430 | followed inferior. */ | |
431 | ||
432 | static int | |
433 | follow_fork_inferior (int follow_child, int detach_fork) | |
434 | { | |
435 | int has_vforked; | |
79639e11 | 436 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
437 | |
438 | has_vforked = (inferior_thread ()->pending_follow.kind | |
439 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
440 | parent_ptid = inferior_ptid; |
441 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
442 | |
443 | if (has_vforked | |
444 | && !non_stop /* Non-stop always resumes both branches. */ | |
445 | && (!target_is_async_p () || sync_execution) | |
446 | && !(follow_child || detach_fork || sched_multi)) | |
447 | { | |
448 | /* The parent stays blocked inside the vfork syscall until the | |
449 | child execs or exits. If we don't let the child run, then | |
450 | the parent stays blocked. If we're telling the parent to run | |
451 | in the foreground, the user will not be able to ctrl-c to get | |
452 | back the terminal, effectively hanging the debug session. */ | |
453 | fprintf_filtered (gdb_stderr, _("\ | |
454 | Can not resume the parent process over vfork in the foreground while\n\ | |
455 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
456 | \"set schedule-multiple\".\n")); | |
457 | /* FIXME output string > 80 columns. */ | |
458 | return 1; | |
459 | } | |
460 | ||
461 | if (!follow_child) | |
462 | { | |
463 | /* Detach new forked process? */ | |
464 | if (detach_fork) | |
465 | { | |
466 | struct cleanup *old_chain; | |
467 | ||
468 | /* Before detaching from the child, remove all breakpoints | |
469 | from it. If we forked, then this has already been taken | |
470 | care of by infrun.c. If we vforked however, any | |
471 | breakpoint inserted in the parent is visible in the | |
472 | child, even those added while stopped in a vfork | |
473 | catchpoint. This will remove the breakpoints from the | |
474 | parent also, but they'll be reinserted below. */ | |
475 | if (has_vforked) | |
476 | { | |
477 | /* Keep breakpoints list in sync. */ | |
478 | remove_breakpoints_pid (ptid_get_pid (inferior_ptid)); | |
479 | } | |
480 | ||
481 | if (info_verbose || debug_infrun) | |
482 | { | |
8dd06f7a DB |
483 | /* Ensure that we have a process ptid. */ |
484 | ptid_t process_ptid = pid_to_ptid (ptid_get_pid (child_ptid)); | |
485 | ||
6f259a23 | 486 | target_terminal_ours_for_output (); |
d83ad864 | 487 | fprintf_filtered (gdb_stdlog, |
79639e11 | 488 | _("Detaching after %s from child %s.\n"), |
6f259a23 | 489 | has_vforked ? "vfork" : "fork", |
8dd06f7a | 490 | target_pid_to_str (process_ptid)); |
d83ad864 DB |
491 | } |
492 | } | |
493 | else | |
494 | { | |
495 | struct inferior *parent_inf, *child_inf; | |
496 | struct cleanup *old_chain; | |
497 | ||
498 | /* Add process to GDB's tables. */ | |
79639e11 | 499 | child_inf = add_inferior (ptid_get_pid (child_ptid)); |
d83ad864 DB |
500 | |
501 | parent_inf = current_inferior (); | |
502 | child_inf->attach_flag = parent_inf->attach_flag; | |
503 | copy_terminal_info (child_inf, parent_inf); | |
504 | child_inf->gdbarch = parent_inf->gdbarch; | |
505 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
506 | ||
507 | old_chain = save_inferior_ptid (); | |
508 | save_current_program_space (); | |
509 | ||
79639e11 | 510 | inferior_ptid = child_ptid; |
d83ad864 DB |
511 | add_thread (inferior_ptid); |
512 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
513 | ||
514 | /* If this is a vfork child, then the address-space is | |
515 | shared with the parent. */ | |
516 | if (has_vforked) | |
517 | { | |
518 | child_inf->pspace = parent_inf->pspace; | |
519 | child_inf->aspace = parent_inf->aspace; | |
520 | ||
521 | /* The parent will be frozen until the child is done | |
522 | with the shared region. Keep track of the | |
523 | parent. */ | |
524 | child_inf->vfork_parent = parent_inf; | |
525 | child_inf->pending_detach = 0; | |
526 | parent_inf->vfork_child = child_inf; | |
527 | parent_inf->pending_detach = 0; | |
528 | } | |
529 | else | |
530 | { | |
531 | child_inf->aspace = new_address_space (); | |
532 | child_inf->pspace = add_program_space (child_inf->aspace); | |
533 | child_inf->removable = 1; | |
534 | set_current_program_space (child_inf->pspace); | |
535 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
536 | ||
537 | /* Let the shared library layer (e.g., solib-svr4) learn | |
538 | about this new process, relocate the cloned exec, pull | |
539 | in shared libraries, and install the solib event | |
540 | breakpoint. If a "cloned-VM" event was propagated | |
541 | better throughout the core, this wouldn't be | |
542 | required. */ | |
543 | solib_create_inferior_hook (0); | |
544 | } | |
545 | ||
546 | do_cleanups (old_chain); | |
547 | } | |
548 | ||
549 | if (has_vforked) | |
550 | { | |
551 | struct inferior *parent_inf; | |
552 | ||
553 | parent_inf = current_inferior (); | |
554 | ||
555 | /* If we detached from the child, then we have to be careful | |
556 | to not insert breakpoints in the parent until the child | |
557 | is done with the shared memory region. However, if we're | |
558 | staying attached to the child, then we can and should | |
559 | insert breakpoints, so that we can debug it. A | |
560 | subsequent child exec or exit is enough to know when does | |
561 | the child stops using the parent's address space. */ | |
562 | parent_inf->waiting_for_vfork_done = detach_fork; | |
563 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
564 | } | |
565 | } | |
566 | else | |
567 | { | |
568 | /* Follow the child. */ | |
569 | struct inferior *parent_inf, *child_inf; | |
570 | struct program_space *parent_pspace; | |
571 | ||
572 | if (info_verbose || debug_infrun) | |
573 | { | |
6f259a23 DB |
574 | target_terminal_ours_for_output (); |
575 | fprintf_filtered (gdb_stdlog, | |
79639e11 PA |
576 | _("Attaching after %s %s to child %s.\n"), |
577 | target_pid_to_str (parent_ptid), | |
6f259a23 | 578 | has_vforked ? "vfork" : "fork", |
79639e11 | 579 | target_pid_to_str (child_ptid)); |
d83ad864 DB |
580 | } |
581 | ||
582 | /* Add the new inferior first, so that the target_detach below | |
583 | doesn't unpush the target. */ | |
584 | ||
79639e11 | 585 | child_inf = add_inferior (ptid_get_pid (child_ptid)); |
d83ad864 DB |
586 | |
587 | parent_inf = current_inferior (); | |
588 | child_inf->attach_flag = parent_inf->attach_flag; | |
589 | copy_terminal_info (child_inf, parent_inf); | |
590 | child_inf->gdbarch = parent_inf->gdbarch; | |
591 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
592 | ||
593 | parent_pspace = parent_inf->pspace; | |
594 | ||
595 | /* If we're vforking, we want to hold on to the parent until the | |
596 | child exits or execs. At child exec or exit time we can | |
597 | remove the old breakpoints from the parent and detach or | |
598 | resume debugging it. Otherwise, detach the parent now; we'll | |
599 | want to reuse it's program/address spaces, but we can't set | |
600 | them to the child before removing breakpoints from the | |
601 | parent, otherwise, the breakpoints module could decide to | |
602 | remove breakpoints from the wrong process (since they'd be | |
603 | assigned to the same address space). */ | |
604 | ||
605 | if (has_vforked) | |
606 | { | |
607 | gdb_assert (child_inf->vfork_parent == NULL); | |
608 | gdb_assert (parent_inf->vfork_child == NULL); | |
609 | child_inf->vfork_parent = parent_inf; | |
610 | child_inf->pending_detach = 0; | |
611 | parent_inf->vfork_child = child_inf; | |
612 | parent_inf->pending_detach = detach_fork; | |
613 | parent_inf->waiting_for_vfork_done = 0; | |
614 | } | |
615 | else if (detach_fork) | |
6f259a23 DB |
616 | { |
617 | if (info_verbose || debug_infrun) | |
618 | { | |
8dd06f7a DB |
619 | /* Ensure that we have a process ptid. */ |
620 | ptid_t process_ptid = pid_to_ptid (ptid_get_pid (child_ptid)); | |
621 | ||
6f259a23 DB |
622 | target_terminal_ours_for_output (); |
623 | fprintf_filtered (gdb_stdlog, | |
624 | _("Detaching after fork from " | |
79639e11 | 625 | "child %s.\n"), |
8dd06f7a | 626 | target_pid_to_str (process_ptid)); |
6f259a23 DB |
627 | } |
628 | ||
629 | target_detach (NULL, 0); | |
630 | } | |
d83ad864 DB |
631 | |
632 | /* Note that the detach above makes PARENT_INF dangling. */ | |
633 | ||
634 | /* Add the child thread to the appropriate lists, and switch to | |
635 | this new thread, before cloning the program space, and | |
636 | informing the solib layer about this new process. */ | |
637 | ||
79639e11 | 638 | inferior_ptid = child_ptid; |
d83ad864 DB |
639 | add_thread (inferior_ptid); |
640 | ||
641 | /* If this is a vfork child, then the address-space is shared | |
642 | with the parent. If we detached from the parent, then we can | |
643 | reuse the parent's program/address spaces. */ | |
644 | if (has_vforked || detach_fork) | |
645 | { | |
646 | child_inf->pspace = parent_pspace; | |
647 | child_inf->aspace = child_inf->pspace->aspace; | |
648 | } | |
649 | else | |
650 | { | |
651 | child_inf->aspace = new_address_space (); | |
652 | child_inf->pspace = add_program_space (child_inf->aspace); | |
653 | child_inf->removable = 1; | |
654 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
655 | set_current_program_space (child_inf->pspace); | |
656 | clone_program_space (child_inf->pspace, parent_pspace); | |
657 | ||
658 | /* Let the shared library layer (e.g., solib-svr4) learn | |
659 | about this new process, relocate the cloned exec, pull in | |
660 | shared libraries, and install the solib event breakpoint. | |
661 | If a "cloned-VM" event was propagated better throughout | |
662 | the core, this wouldn't be required. */ | |
663 | solib_create_inferior_hook (0); | |
664 | } | |
665 | } | |
666 | ||
667 | return target_follow_fork (follow_child, detach_fork); | |
668 | } | |
669 | ||
e58b0e63 PA |
670 | /* Tell the target to follow the fork we're stopped at. Returns true |
671 | if the inferior should be resumed; false, if the target for some | |
672 | reason decided it's best not to resume. */ | |
673 | ||
6604731b | 674 | static int |
4ef3f3be | 675 | follow_fork (void) |
c906108c | 676 | { |
ea1dd7bc | 677 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
678 | int should_resume = 1; |
679 | struct thread_info *tp; | |
680 | ||
681 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
682 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
683 | parent thread structure's run control related fields, not just these. |
684 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
685 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 686 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
687 | CORE_ADDR step_range_start = 0; |
688 | CORE_ADDR step_range_end = 0; | |
689 | struct frame_id step_frame_id = { 0 }; | |
17b2616c | 690 | struct interp *command_interp = NULL; |
e58b0e63 PA |
691 | |
692 | if (!non_stop) | |
693 | { | |
694 | ptid_t wait_ptid; | |
695 | struct target_waitstatus wait_status; | |
696 | ||
697 | /* Get the last target status returned by target_wait(). */ | |
698 | get_last_target_status (&wait_ptid, &wait_status); | |
699 | ||
700 | /* If not stopped at a fork event, then there's nothing else to | |
701 | do. */ | |
702 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
703 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
704 | return 1; | |
705 | ||
706 | /* Check if we switched over from WAIT_PTID, since the event was | |
707 | reported. */ | |
708 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
709 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
710 | { | |
711 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
712 | target to follow it (in either direction). We'll | |
713 | afterwards refuse to resume, and inform the user what | |
714 | happened. */ | |
715 | switch_to_thread (wait_ptid); | |
716 | should_resume = 0; | |
717 | } | |
718 | } | |
719 | ||
720 | tp = inferior_thread (); | |
721 | ||
722 | /* If there were any forks/vforks that were caught and are now to be | |
723 | followed, then do so now. */ | |
724 | switch (tp->pending_follow.kind) | |
725 | { | |
726 | case TARGET_WAITKIND_FORKED: | |
727 | case TARGET_WAITKIND_VFORKED: | |
728 | { | |
729 | ptid_t parent, child; | |
730 | ||
731 | /* If the user did a next/step, etc, over a fork call, | |
732 | preserve the stepping state in the fork child. */ | |
733 | if (follow_child && should_resume) | |
734 | { | |
8358c15c JK |
735 | step_resume_breakpoint = clone_momentary_breakpoint |
736 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
737 | step_range_start = tp->control.step_range_start; |
738 | step_range_end = tp->control.step_range_end; | |
739 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
740 | exception_resume_breakpoint |
741 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
17b2616c | 742 | command_interp = tp->control.command_interp; |
e58b0e63 PA |
743 | |
744 | /* For now, delete the parent's sr breakpoint, otherwise, | |
745 | parent/child sr breakpoints are considered duplicates, | |
746 | and the child version will not be installed. Remove | |
747 | this when the breakpoints module becomes aware of | |
748 | inferiors and address spaces. */ | |
749 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
750 | tp->control.step_range_start = 0; |
751 | tp->control.step_range_end = 0; | |
752 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 753 | delete_exception_resume_breakpoint (tp); |
17b2616c | 754 | tp->control.command_interp = NULL; |
e58b0e63 PA |
755 | } |
756 | ||
757 | parent = inferior_ptid; | |
758 | child = tp->pending_follow.value.related_pid; | |
759 | ||
d83ad864 DB |
760 | /* Set up inferior(s) as specified by the caller, and tell the |
761 | target to do whatever is necessary to follow either parent | |
762 | or child. */ | |
763 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
764 | { |
765 | /* Target refused to follow, or there's some other reason | |
766 | we shouldn't resume. */ | |
767 | should_resume = 0; | |
768 | } | |
769 | else | |
770 | { | |
771 | /* This pending follow fork event is now handled, one way | |
772 | or another. The previous selected thread may be gone | |
773 | from the lists by now, but if it is still around, need | |
774 | to clear the pending follow request. */ | |
e09875d4 | 775 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
776 | if (tp) |
777 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
778 | ||
779 | /* This makes sure we don't try to apply the "Switched | |
780 | over from WAIT_PID" logic above. */ | |
781 | nullify_last_target_wait_ptid (); | |
782 | ||
1777feb0 | 783 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
784 | if (follow_child) |
785 | { | |
786 | switch_to_thread (child); | |
787 | ||
788 | /* ... and preserve the stepping state, in case the | |
789 | user was stepping over the fork call. */ | |
790 | if (should_resume) | |
791 | { | |
792 | tp = inferior_thread (); | |
8358c15c JK |
793 | tp->control.step_resume_breakpoint |
794 | = step_resume_breakpoint; | |
16c381f0 JK |
795 | tp->control.step_range_start = step_range_start; |
796 | tp->control.step_range_end = step_range_end; | |
797 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
798 | tp->control.exception_resume_breakpoint |
799 | = exception_resume_breakpoint; | |
17b2616c | 800 | tp->control.command_interp = command_interp; |
e58b0e63 PA |
801 | } |
802 | else | |
803 | { | |
804 | /* If we get here, it was because we're trying to | |
805 | resume from a fork catchpoint, but, the user | |
806 | has switched threads away from the thread that | |
807 | forked. In that case, the resume command | |
808 | issued is most likely not applicable to the | |
809 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 810 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 811 | "before following fork child.")); |
e58b0e63 PA |
812 | } |
813 | ||
814 | /* Reset breakpoints in the child as appropriate. */ | |
815 | follow_inferior_reset_breakpoints (); | |
816 | } | |
817 | else | |
818 | switch_to_thread (parent); | |
819 | } | |
820 | } | |
821 | break; | |
822 | case TARGET_WAITKIND_SPURIOUS: | |
823 | /* Nothing to follow. */ | |
824 | break; | |
825 | default: | |
826 | internal_error (__FILE__, __LINE__, | |
827 | "Unexpected pending_follow.kind %d\n", | |
828 | tp->pending_follow.kind); | |
829 | break; | |
830 | } | |
c906108c | 831 | |
e58b0e63 | 832 | return should_resume; |
c906108c SS |
833 | } |
834 | ||
d83ad864 | 835 | static void |
6604731b | 836 | follow_inferior_reset_breakpoints (void) |
c906108c | 837 | { |
4e1c45ea PA |
838 | struct thread_info *tp = inferior_thread (); |
839 | ||
6604731b DJ |
840 | /* Was there a step_resume breakpoint? (There was if the user |
841 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
842 | thread number. Cloned step_resume breakpoints are disabled on |
843 | creation, so enable it here now that it is associated with the | |
844 | correct thread. | |
6604731b DJ |
845 | |
846 | step_resumes are a form of bp that are made to be per-thread. | |
847 | Since we created the step_resume bp when the parent process | |
848 | was being debugged, and now are switching to the child process, | |
849 | from the breakpoint package's viewpoint, that's a switch of | |
850 | "threads". We must update the bp's notion of which thread | |
851 | it is for, or it'll be ignored when it triggers. */ | |
852 | ||
8358c15c | 853 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
854 | { |
855 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
856 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
857 | } | |
6604731b | 858 | |
a1aa2221 | 859 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 860 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
861 | { |
862 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
863 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
864 | } | |
186c406b | 865 | |
6604731b DJ |
866 | /* Reinsert all breakpoints in the child. The user may have set |
867 | breakpoints after catching the fork, in which case those | |
868 | were never set in the child, but only in the parent. This makes | |
869 | sure the inserted breakpoints match the breakpoint list. */ | |
870 | ||
871 | breakpoint_re_set (); | |
872 | insert_breakpoints (); | |
c906108c | 873 | } |
c906108c | 874 | |
6c95b8df PA |
875 | /* The child has exited or execed: resume threads of the parent the |
876 | user wanted to be executing. */ | |
877 | ||
878 | static int | |
879 | proceed_after_vfork_done (struct thread_info *thread, | |
880 | void *arg) | |
881 | { | |
882 | int pid = * (int *) arg; | |
883 | ||
884 | if (ptid_get_pid (thread->ptid) == pid | |
885 | && is_running (thread->ptid) | |
886 | && !is_executing (thread->ptid) | |
887 | && !thread->stop_requested | |
a493e3e2 | 888 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df PA |
889 | { |
890 | if (debug_infrun) | |
891 | fprintf_unfiltered (gdb_stdlog, | |
892 | "infrun: resuming vfork parent thread %s\n", | |
893 | target_pid_to_str (thread->ptid)); | |
894 | ||
895 | switch_to_thread (thread->ptid); | |
70509625 | 896 | clear_proceed_status (0); |
64ce06e4 | 897 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
898 | } |
899 | ||
900 | return 0; | |
901 | } | |
902 | ||
903 | /* Called whenever we notice an exec or exit event, to handle | |
904 | detaching or resuming a vfork parent. */ | |
905 | ||
906 | static void | |
907 | handle_vfork_child_exec_or_exit (int exec) | |
908 | { | |
909 | struct inferior *inf = current_inferior (); | |
910 | ||
911 | if (inf->vfork_parent) | |
912 | { | |
913 | int resume_parent = -1; | |
914 | ||
915 | /* This exec or exit marks the end of the shared memory region | |
916 | between the parent and the child. If the user wanted to | |
917 | detach from the parent, now is the time. */ | |
918 | ||
919 | if (inf->vfork_parent->pending_detach) | |
920 | { | |
921 | struct thread_info *tp; | |
922 | struct cleanup *old_chain; | |
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 | ||
f50f4e56 PA |
930 | if (!exec) |
931 | { | |
932 | /* If we're handling a child exit, then inferior_ptid | |
933 | points at the inferior's pid, not to a thread. */ | |
934 | old_chain = save_inferior_ptid (); | |
935 | save_current_program_space (); | |
936 | save_current_inferior (); | |
937 | } | |
938 | else | |
939 | old_chain = save_current_space_and_thread (); | |
6c95b8df PA |
940 | |
941 | /* We're letting loose of the parent. */ | |
942 | tp = any_live_thread_of_process (inf->vfork_parent->pid); | |
943 | switch_to_thread (tp->ptid); | |
944 | ||
945 | /* We're about to detach from the parent, which implicitly | |
946 | removes breakpoints from its address space. There's a | |
947 | catch here: we want to reuse the spaces for the child, | |
948 | but, parent/child are still sharing the pspace at this | |
949 | point, although the exec in reality makes the kernel give | |
950 | the child a fresh set of new pages. The problem here is | |
951 | that the breakpoints module being unaware of this, would | |
952 | likely chose the child process to write to the parent | |
953 | address space. Swapping the child temporarily away from | |
954 | the spaces has the desired effect. Yes, this is "sort | |
955 | of" a hack. */ | |
956 | ||
957 | pspace = inf->pspace; | |
958 | aspace = inf->aspace; | |
959 | inf->aspace = NULL; | |
960 | inf->pspace = NULL; | |
961 | ||
962 | if (debug_infrun || info_verbose) | |
963 | { | |
6f259a23 | 964 | target_terminal_ours_for_output (); |
6c95b8df PA |
965 | |
966 | if (exec) | |
6f259a23 DB |
967 | { |
968 | fprintf_filtered (gdb_stdlog, | |
969 | _("Detaching vfork parent process " | |
970 | "%d after child exec.\n"), | |
971 | inf->vfork_parent->pid); | |
972 | } | |
6c95b8df | 973 | else |
6f259a23 DB |
974 | { |
975 | fprintf_filtered (gdb_stdlog, | |
976 | _("Detaching vfork parent process " | |
977 | "%d after child exit.\n"), | |
978 | inf->vfork_parent->pid); | |
979 | } | |
6c95b8df PA |
980 | } |
981 | ||
982 | target_detach (NULL, 0); | |
983 | ||
984 | /* Put it back. */ | |
985 | inf->pspace = pspace; | |
986 | inf->aspace = aspace; | |
987 | ||
988 | do_cleanups (old_chain); | |
989 | } | |
990 | else if (exec) | |
991 | { | |
992 | /* We're staying attached to the parent, so, really give the | |
993 | child a new address space. */ | |
994 | inf->pspace = add_program_space (maybe_new_address_space ()); | |
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 | { | |
1006 | struct cleanup *old_chain; | |
1007 | struct program_space *pspace; | |
1008 | ||
1009 | /* If this is a vfork child exiting, then the pspace and | |
1010 | aspaces were shared with the parent. Since we're | |
1011 | reporting the process exit, we'll be mourning all that is | |
1012 | found in the address space, and switching to null_ptid, | |
1013 | preparing to start a new inferior. But, since we don't | |
1014 | want to clobber the parent's address/program spaces, we | |
1015 | go ahead and create a new one for this exiting | |
1016 | inferior. */ | |
1017 | ||
1018 | /* Switch to null_ptid, so that clone_program_space doesn't want | |
1019 | to read the selected frame of a dead process. */ | |
1020 | old_chain = save_inferior_ptid (); | |
1021 | inferior_ptid = null_ptid; | |
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; | |
1028 | pspace = add_program_space (maybe_new_address_space ()); | |
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 | ||
1036 | /* Put back inferior_ptid. We'll continue mourning this | |
1777feb0 | 1037 | inferior. */ |
6c95b8df PA |
1038 | do_cleanups (old_chain); |
1039 | ||
1040 | resume_parent = inf->vfork_parent->pid; | |
1041 | /* Break the bonds. */ | |
1042 | inf->vfork_parent->vfork_child = NULL; | |
1043 | } | |
1044 | ||
1045 | inf->vfork_parent = NULL; | |
1046 | ||
1047 | gdb_assert (current_program_space == inf->pspace); | |
1048 | ||
1049 | if (non_stop && resume_parent != -1) | |
1050 | { | |
1051 | /* If the user wanted the parent to be running, let it go | |
1052 | free now. */ | |
1053 | struct cleanup *old_chain = make_cleanup_restore_current_thread (); | |
1054 | ||
1055 | if (debug_infrun) | |
3e43a32a MS |
1056 | fprintf_unfiltered (gdb_stdlog, |
1057 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
1058 | resume_parent); |
1059 | ||
1060 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
1061 | ||
1062 | do_cleanups (old_chain); | |
1063 | } | |
1064 | } | |
1065 | } | |
1066 | ||
eb6c553b | 1067 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1068 | |
1069 | static const char follow_exec_mode_new[] = "new"; | |
1070 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1071 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1072 | { |
1073 | follow_exec_mode_new, | |
1074 | follow_exec_mode_same, | |
1075 | NULL, | |
1076 | }; | |
1077 | ||
1078 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1079 | static void | |
1080 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1081 | struct cmd_list_element *c, const char *value) | |
1082 | { | |
1083 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1084 | } | |
1085 | ||
1777feb0 | 1086 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
1adeb98a | 1087 | |
c906108c | 1088 | static void |
95e50b27 | 1089 | follow_exec (ptid_t ptid, char *execd_pathname) |
c906108c | 1090 | { |
95e50b27 | 1091 | struct thread_info *th, *tmp; |
6c95b8df | 1092 | struct inferior *inf = current_inferior (); |
95e50b27 | 1093 | int pid = ptid_get_pid (ptid); |
94585166 | 1094 | ptid_t process_ptid; |
7a292a7a | 1095 | |
c906108c SS |
1096 | /* This is an exec event that we actually wish to pay attention to. |
1097 | Refresh our symbol table to the newly exec'd program, remove any | |
1098 | momentary bp's, etc. | |
1099 | ||
1100 | If there are breakpoints, they aren't really inserted now, | |
1101 | since the exec() transformed our inferior into a fresh set | |
1102 | of instructions. | |
1103 | ||
1104 | We want to preserve symbolic breakpoints on the list, since | |
1105 | we have hopes that they can be reset after the new a.out's | |
1106 | symbol table is read. | |
1107 | ||
1108 | However, any "raw" breakpoints must be removed from the list | |
1109 | (e.g., the solib bp's), since their address is probably invalid | |
1110 | now. | |
1111 | ||
1112 | And, we DON'T want to call delete_breakpoints() here, since | |
1113 | that may write the bp's "shadow contents" (the instruction | |
1114 | value that was overwritten witha TRAP instruction). Since | |
1777feb0 | 1115 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1116 | |
1117 | mark_breakpoints_out (); | |
1118 | ||
95e50b27 PA |
1119 | /* The target reports the exec event to the main thread, even if |
1120 | some other thread does the exec, and even if the main thread was | |
1121 | stopped or already gone. We may still have non-leader threads of | |
1122 | the process on our list. E.g., on targets that don't have thread | |
1123 | exit events (like remote); or on native Linux in non-stop mode if | |
1124 | there were only two threads in the inferior and the non-leader | |
1125 | one is the one that execs (and nothing forces an update of the | |
1126 | thread list up to here). When debugging remotely, it's best to | |
1127 | avoid extra traffic, when possible, so avoid syncing the thread | |
1128 | list with the target, and instead go ahead and delete all threads | |
1129 | of the process but one that reported the event. Note this must | |
1130 | be done before calling update_breakpoints_after_exec, as | |
1131 | otherwise clearing the threads' resources would reference stale | |
1132 | thread breakpoints -- it may have been one of these threads that | |
1133 | stepped across the exec. We could just clear their stepping | |
1134 | states, but as long as we're iterating, might as well delete | |
1135 | them. Deleting them now rather than at the next user-visible | |
1136 | stop provides a nicer sequence of events for user and MI | |
1137 | notifications. */ | |
8a06aea7 | 1138 | ALL_THREADS_SAFE (th, tmp) |
95e50b27 PA |
1139 | if (ptid_get_pid (th->ptid) == pid && !ptid_equal (th->ptid, ptid)) |
1140 | delete_thread (th->ptid); | |
1141 | ||
1142 | /* We also need to clear any left over stale state for the | |
1143 | leader/event thread. E.g., if there was any step-resume | |
1144 | breakpoint or similar, it's gone now. We cannot truly | |
1145 | step-to-next statement through an exec(). */ | |
1146 | th = inferior_thread (); | |
8358c15c | 1147 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1148 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1149 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1150 | th->control.step_range_start = 0; |
1151 | th->control.step_range_end = 0; | |
c906108c | 1152 | |
95e50b27 PA |
1153 | /* The user may have had the main thread held stopped in the |
1154 | previous image (e.g., schedlock on, or non-stop). Release | |
1155 | it now. */ | |
a75724bc PA |
1156 | th->stop_requested = 0; |
1157 | ||
95e50b27 PA |
1158 | update_breakpoints_after_exec (); |
1159 | ||
1777feb0 | 1160 | /* What is this a.out's name? */ |
94585166 | 1161 | process_ptid = pid_to_ptid (pid); |
6c95b8df | 1162 | printf_unfiltered (_("%s is executing new program: %s\n"), |
94585166 | 1163 | target_pid_to_str (process_ptid), |
6c95b8df | 1164 | execd_pathname); |
c906108c SS |
1165 | |
1166 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1167 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1168 | |
c906108c | 1169 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
1170 | |
1171 | breakpoint_init_inferior (inf_execd); | |
e85a822c | 1172 | |
a3be80c3 | 1173 | if (*gdb_sysroot != '\0') |
e85a822c | 1174 | { |
998d2a3e | 1175 | char *name = exec_file_find (execd_pathname, NULL); |
ff862be4 | 1176 | |
224c3ddb | 1177 | execd_pathname = (char *) alloca (strlen (name) + 1); |
ff862be4 GB |
1178 | strcpy (execd_pathname, name); |
1179 | xfree (name); | |
e85a822c | 1180 | } |
c906108c | 1181 | |
cce9b6bf PA |
1182 | /* Reset the shared library package. This ensures that we get a |
1183 | shlib event when the child reaches "_start", at which point the | |
1184 | dld will have had a chance to initialize the child. */ | |
1185 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1186 | we don't want those to be satisfied by the libraries of the | |
1187 | previous incarnation of this process. */ | |
1188 | no_shared_libraries (NULL, 0); | |
1189 | ||
6c95b8df PA |
1190 | if (follow_exec_mode_string == follow_exec_mode_new) |
1191 | { | |
6c95b8df PA |
1192 | /* The user wants to keep the old inferior and program spaces |
1193 | around. Create a new fresh one, and switch to it. */ | |
1194 | ||
17d8546e DB |
1195 | /* Do exit processing for the original inferior before adding |
1196 | the new inferior so we don't have two active inferiors with | |
1197 | the same ptid, which can confuse find_inferior_ptid. */ | |
1198 | exit_inferior_num_silent (current_inferior ()->num); | |
1199 | ||
94585166 DB |
1200 | inf = add_inferior_with_spaces (); |
1201 | inf->pid = pid; | |
1202 | target_follow_exec (inf, execd_pathname); | |
6c95b8df PA |
1203 | |
1204 | set_current_inferior (inf); | |
94585166 DB |
1205 | set_current_program_space (inf->pspace); |
1206 | add_thread (ptid); | |
6c95b8df | 1207 | } |
9107fc8d PA |
1208 | else |
1209 | { | |
1210 | /* The old description may no longer be fit for the new image. | |
1211 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1212 | old description; we'll read a new one below. No need to do | |
1213 | this on "follow-exec-mode new", as the old inferior stays | |
1214 | around (its description is later cleared/refetched on | |
1215 | restart). */ | |
1216 | target_clear_description (); | |
1217 | } | |
6c95b8df PA |
1218 | |
1219 | gdb_assert (current_program_space == inf->pspace); | |
1220 | ||
1777feb0 | 1221 | /* That a.out is now the one to use. */ |
6c95b8df PA |
1222 | exec_file_attach (execd_pathname, 0); |
1223 | ||
c1e56572 JK |
1224 | /* SYMFILE_DEFER_BP_RESET is used as the proper displacement for PIE |
1225 | (Position Independent Executable) main symbol file will get applied by | |
1226 | solib_create_inferior_hook below. breakpoint_re_set would fail to insert | |
1227 | the breakpoints with the zero displacement. */ | |
1228 | ||
7dcd53a0 TT |
1229 | symbol_file_add (execd_pathname, |
1230 | (inf->symfile_flags | |
1231 | | SYMFILE_MAINLINE | SYMFILE_DEFER_BP_RESET), | |
c1e56572 JK |
1232 | NULL, 0); |
1233 | ||
7dcd53a0 TT |
1234 | if ((inf->symfile_flags & SYMFILE_NO_READ) == 0) |
1235 | set_initial_language (); | |
c906108c | 1236 | |
9107fc8d PA |
1237 | /* If the target can specify a description, read it. Must do this |
1238 | after flipping to the new executable (because the target supplied | |
1239 | description must be compatible with the executable's | |
1240 | architecture, and the old executable may e.g., be 32-bit, while | |
1241 | the new one 64-bit), and before anything involving memory or | |
1242 | registers. */ | |
1243 | target_find_description (); | |
1244 | ||
268a4a75 | 1245 | solib_create_inferior_hook (0); |
c906108c | 1246 | |
4efc6507 DE |
1247 | jit_inferior_created_hook (); |
1248 | ||
c1e56572 JK |
1249 | breakpoint_re_set (); |
1250 | ||
c906108c SS |
1251 | /* Reinsert all breakpoints. (Those which were symbolic have |
1252 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1253 | to symbol_file_command...). */ |
c906108c SS |
1254 | insert_breakpoints (); |
1255 | ||
1256 | /* The next resume of this inferior should bring it to the shlib | |
1257 | startup breakpoints. (If the user had also set bp's on | |
1258 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1259 | matically get reset there in the new process.). */ |
c906108c SS |
1260 | } |
1261 | ||
c2829269 PA |
1262 | /* The queue of threads that need to do a step-over operation to get |
1263 | past e.g., a breakpoint. What technique is used to step over the | |
1264 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1265 | same queue, to maintain rough temporal order of execution, in order | |
1266 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1267 | constantly stepping the same couple threads past their breakpoints | |
1268 | over and over, if the single-step finish fast enough. */ | |
1269 | struct thread_info *step_over_queue_head; | |
1270 | ||
6c4cfb24 PA |
1271 | /* Bit flags indicating what the thread needs to step over. */ |
1272 | ||
8d297bbf | 1273 | enum step_over_what_flag |
6c4cfb24 PA |
1274 | { |
1275 | /* Step over a breakpoint. */ | |
1276 | STEP_OVER_BREAKPOINT = 1, | |
1277 | ||
1278 | /* Step past a non-continuable watchpoint, in order to let the | |
1279 | instruction execute so we can evaluate the watchpoint | |
1280 | expression. */ | |
1281 | STEP_OVER_WATCHPOINT = 2 | |
1282 | }; | |
8d297bbf | 1283 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1284 | |
963f9c80 | 1285 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1286 | |
1287 | struct step_over_info | |
1288 | { | |
963f9c80 PA |
1289 | /* If we're stepping past a breakpoint, this is the address space |
1290 | and address of the instruction the breakpoint is set at. We'll | |
1291 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1292 | non-NULL. */ | |
31e77af2 | 1293 | struct address_space *aspace; |
31e77af2 | 1294 | CORE_ADDR address; |
963f9c80 PA |
1295 | |
1296 | /* The instruction being stepped over triggers a nonsteppable | |
1297 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1298 | int nonsteppable_watchpoint_p; | |
31e77af2 PA |
1299 | }; |
1300 | ||
1301 | /* The step-over info of the location that is being stepped over. | |
1302 | ||
1303 | Note that with async/breakpoint always-inserted mode, a user might | |
1304 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1305 | being stepped over. As setting a new breakpoint inserts all | |
1306 | breakpoints, we need to make sure the breakpoint being stepped over | |
1307 | isn't inserted then. We do that by only clearing the step-over | |
1308 | info when the step-over is actually finished (or aborted). | |
1309 | ||
1310 | Presently GDB can only step over one breakpoint at any given time. | |
1311 | Given threads that can't run code in the same address space as the | |
1312 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1313 | to step-over at most one breakpoint per address space (so this info | |
1314 | could move to the address space object if/when GDB is extended). | |
1315 | The set of breakpoints being stepped over will normally be much | |
1316 | smaller than the set of all breakpoints, so a flag in the | |
1317 | breakpoint location structure would be wasteful. A separate list | |
1318 | also saves complexity and run-time, as otherwise we'd have to go | |
1319 | through all breakpoint locations clearing their flag whenever we | |
1320 | start a new sequence. Similar considerations weigh against storing | |
1321 | this info in the thread object. Plus, not all step overs actually | |
1322 | have breakpoint locations -- e.g., stepping past a single-step | |
1323 | breakpoint, or stepping to complete a non-continuable | |
1324 | watchpoint. */ | |
1325 | static struct step_over_info step_over_info; | |
1326 | ||
1327 | /* Record the address of the breakpoint/instruction we're currently | |
1328 | stepping over. */ | |
1329 | ||
1330 | static void | |
963f9c80 PA |
1331 | set_step_over_info (struct address_space *aspace, CORE_ADDR address, |
1332 | int nonsteppable_watchpoint_p) | |
31e77af2 PA |
1333 | { |
1334 | step_over_info.aspace = aspace; | |
1335 | step_over_info.address = address; | |
963f9c80 | 1336 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
31e77af2 PA |
1337 | } |
1338 | ||
1339 | /* Called when we're not longer stepping over a breakpoint / an | |
1340 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1341 | ||
1342 | static void | |
1343 | clear_step_over_info (void) | |
1344 | { | |
372316f1 PA |
1345 | if (debug_infrun) |
1346 | fprintf_unfiltered (gdb_stdlog, | |
1347 | "infrun: clear_step_over_info\n"); | |
31e77af2 PA |
1348 | step_over_info.aspace = NULL; |
1349 | step_over_info.address = 0; | |
963f9c80 | 1350 | step_over_info.nonsteppable_watchpoint_p = 0; |
31e77af2 PA |
1351 | } |
1352 | ||
7f89fd65 | 1353 | /* See infrun.h. */ |
31e77af2 PA |
1354 | |
1355 | int | |
1356 | stepping_past_instruction_at (struct address_space *aspace, | |
1357 | CORE_ADDR address) | |
1358 | { | |
1359 | return (step_over_info.aspace != NULL | |
1360 | && breakpoint_address_match (aspace, address, | |
1361 | step_over_info.aspace, | |
1362 | step_over_info.address)); | |
1363 | } | |
1364 | ||
963f9c80 PA |
1365 | /* See infrun.h. */ |
1366 | ||
1367 | int | |
1368 | stepping_past_nonsteppable_watchpoint (void) | |
1369 | { | |
1370 | return step_over_info.nonsteppable_watchpoint_p; | |
1371 | } | |
1372 | ||
6cc83d2a PA |
1373 | /* Returns true if step-over info is valid. */ |
1374 | ||
1375 | static int | |
1376 | step_over_info_valid_p (void) | |
1377 | { | |
963f9c80 PA |
1378 | return (step_over_info.aspace != NULL |
1379 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1380 | } |
1381 | ||
c906108c | 1382 | \f |
237fc4c9 PA |
1383 | /* Displaced stepping. */ |
1384 | ||
1385 | /* In non-stop debugging mode, we must take special care to manage | |
1386 | breakpoints properly; in particular, the traditional strategy for | |
1387 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1388 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1389 | breakpoint it has hit while ensuring that other threads running | |
1390 | concurrently will hit the breakpoint as they should. | |
1391 | ||
1392 | The traditional way to step a thread T off a breakpoint in a | |
1393 | multi-threaded program in all-stop mode is as follows: | |
1394 | ||
1395 | a0) Initially, all threads are stopped, and breakpoints are not | |
1396 | inserted. | |
1397 | a1) We single-step T, leaving breakpoints uninserted. | |
1398 | a2) We insert breakpoints, and resume all threads. | |
1399 | ||
1400 | In non-stop debugging, however, this strategy is unsuitable: we | |
1401 | don't want to have to stop all threads in the system in order to | |
1402 | continue or step T past a breakpoint. Instead, we use displaced | |
1403 | stepping: | |
1404 | ||
1405 | n0) Initially, T is stopped, other threads are running, and | |
1406 | breakpoints are inserted. | |
1407 | n1) We copy the instruction "under" the breakpoint to a separate | |
1408 | location, outside the main code stream, making any adjustments | |
1409 | to the instruction, register, and memory state as directed by | |
1410 | T's architecture. | |
1411 | n2) We single-step T over the instruction at its new location. | |
1412 | n3) We adjust the resulting register and memory state as directed | |
1413 | by T's architecture. This includes resetting T's PC to point | |
1414 | back into the main instruction stream. | |
1415 | n4) We resume T. | |
1416 | ||
1417 | This approach depends on the following gdbarch methods: | |
1418 | ||
1419 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1420 | indicate where to copy the instruction, and how much space must | |
1421 | be reserved there. We use these in step n1. | |
1422 | ||
1423 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1424 | address, and makes any necessary adjustments to the instruction, | |
1425 | register contents, and memory. We use this in step n1. | |
1426 | ||
1427 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
1428 | we have successfuly single-stepped the instruction, to yield the | |
1429 | same effect the instruction would have had if we had executed it | |
1430 | at its original address. We use this in step n3. | |
1431 | ||
1432 | - gdbarch_displaced_step_free_closure provides cleanup. | |
1433 | ||
1434 | The gdbarch_displaced_step_copy_insn and | |
1435 | gdbarch_displaced_step_fixup functions must be written so that | |
1436 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1437 | single-stepping across the copied instruction, and then applying | |
1438 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1439 | thread's memory and registers as stepping the instruction in place | |
1440 | would have. Exactly which responsibilities fall to the copy and | |
1441 | which fall to the fixup is up to the author of those functions. | |
1442 | ||
1443 | See the comments in gdbarch.sh for details. | |
1444 | ||
1445 | Note that displaced stepping and software single-step cannot | |
1446 | currently be used in combination, although with some care I think | |
1447 | they could be made to. Software single-step works by placing | |
1448 | breakpoints on all possible subsequent instructions; if the | |
1449 | displaced instruction is a PC-relative jump, those breakpoints | |
1450 | could fall in very strange places --- on pages that aren't | |
1451 | executable, or at addresses that are not proper instruction | |
1452 | boundaries. (We do generally let other threads run while we wait | |
1453 | to hit the software single-step breakpoint, and they might | |
1454 | encounter such a corrupted instruction.) One way to work around | |
1455 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1456 | simulate the effect of PC-relative instructions (and return NULL) | |
1457 | on architectures that use software single-stepping. | |
1458 | ||
1459 | In non-stop mode, we can have independent and simultaneous step | |
1460 | requests, so more than one thread may need to simultaneously step | |
1461 | over a breakpoint. The current implementation assumes there is | |
1462 | only one scratch space per process. In this case, we have to | |
1463 | serialize access to the scratch space. If thread A wants to step | |
1464 | over a breakpoint, but we are currently waiting for some other | |
1465 | thread to complete a displaced step, we leave thread A stopped and | |
1466 | place it in the displaced_step_request_queue. Whenever a displaced | |
1467 | step finishes, we pick the next thread in the queue and start a new | |
1468 | displaced step operation on it. See displaced_step_prepare and | |
1469 | displaced_step_fixup for details. */ | |
1470 | ||
fc1cf338 PA |
1471 | /* Per-inferior displaced stepping state. */ |
1472 | struct displaced_step_inferior_state | |
1473 | { | |
1474 | /* Pointer to next in linked list. */ | |
1475 | struct displaced_step_inferior_state *next; | |
1476 | ||
1477 | /* The process this displaced step state refers to. */ | |
1478 | int pid; | |
1479 | ||
3fc8eb30 PA |
1480 | /* True if preparing a displaced step ever failed. If so, we won't |
1481 | try displaced stepping for this inferior again. */ | |
1482 | int failed_before; | |
1483 | ||
fc1cf338 PA |
1484 | /* If this is not null_ptid, this is the thread carrying out a |
1485 | displaced single-step in process PID. This thread's state will | |
1486 | require fixing up once it has completed its step. */ | |
1487 | ptid_t step_ptid; | |
1488 | ||
1489 | /* The architecture the thread had when we stepped it. */ | |
1490 | struct gdbarch *step_gdbarch; | |
1491 | ||
1492 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
1493 | for post-step cleanup. */ | |
1494 | struct displaced_step_closure *step_closure; | |
1495 | ||
1496 | /* The address of the original instruction, and the copy we | |
1497 | made. */ | |
1498 | CORE_ADDR step_original, step_copy; | |
1499 | ||
1500 | /* Saved contents of copy area. */ | |
1501 | gdb_byte *step_saved_copy; | |
1502 | }; | |
1503 | ||
1504 | /* The list of states of processes involved in displaced stepping | |
1505 | presently. */ | |
1506 | static struct displaced_step_inferior_state *displaced_step_inferior_states; | |
1507 | ||
1508 | /* Get the displaced stepping state of process PID. */ | |
1509 | ||
1510 | static struct displaced_step_inferior_state * | |
1511 | get_displaced_stepping_state (int pid) | |
1512 | { | |
1513 | struct displaced_step_inferior_state *state; | |
1514 | ||
1515 | for (state = displaced_step_inferior_states; | |
1516 | state != NULL; | |
1517 | state = state->next) | |
1518 | if (state->pid == pid) | |
1519 | return state; | |
1520 | ||
1521 | return NULL; | |
1522 | } | |
1523 | ||
372316f1 PA |
1524 | /* Returns true if any inferior has a thread doing a displaced |
1525 | step. */ | |
1526 | ||
1527 | static int | |
1528 | displaced_step_in_progress_any_inferior (void) | |
1529 | { | |
1530 | struct displaced_step_inferior_state *state; | |
1531 | ||
1532 | for (state = displaced_step_inferior_states; | |
1533 | state != NULL; | |
1534 | state = state->next) | |
1535 | if (!ptid_equal (state->step_ptid, null_ptid)) | |
1536 | return 1; | |
1537 | ||
1538 | return 0; | |
1539 | } | |
1540 | ||
c0987663 YQ |
1541 | /* Return true if thread represented by PTID is doing a displaced |
1542 | step. */ | |
1543 | ||
1544 | static int | |
1545 | displaced_step_in_progress_thread (ptid_t ptid) | |
1546 | { | |
1547 | struct displaced_step_inferior_state *displaced; | |
1548 | ||
1549 | gdb_assert (!ptid_equal (ptid, null_ptid)); | |
1550 | ||
1551 | displaced = get_displaced_stepping_state (ptid_get_pid (ptid)); | |
1552 | ||
1553 | return (displaced != NULL && ptid_equal (displaced->step_ptid, ptid)); | |
1554 | } | |
1555 | ||
8f572e5c PA |
1556 | /* Return true if process PID has a thread doing a displaced step. */ |
1557 | ||
1558 | static int | |
1559 | displaced_step_in_progress (int pid) | |
1560 | { | |
1561 | struct displaced_step_inferior_state *displaced; | |
1562 | ||
1563 | displaced = get_displaced_stepping_state (pid); | |
1564 | if (displaced != NULL && !ptid_equal (displaced->step_ptid, null_ptid)) | |
1565 | return 1; | |
1566 | ||
1567 | return 0; | |
1568 | } | |
1569 | ||
fc1cf338 PA |
1570 | /* Add a new displaced stepping state for process PID to the displaced |
1571 | stepping state list, or return a pointer to an already existing | |
1572 | entry, if it already exists. Never returns NULL. */ | |
1573 | ||
1574 | static struct displaced_step_inferior_state * | |
1575 | add_displaced_stepping_state (int pid) | |
1576 | { | |
1577 | struct displaced_step_inferior_state *state; | |
1578 | ||
1579 | for (state = displaced_step_inferior_states; | |
1580 | state != NULL; | |
1581 | state = state->next) | |
1582 | if (state->pid == pid) | |
1583 | return state; | |
237fc4c9 | 1584 | |
8d749320 | 1585 | state = XCNEW (struct displaced_step_inferior_state); |
fc1cf338 PA |
1586 | state->pid = pid; |
1587 | state->next = displaced_step_inferior_states; | |
1588 | displaced_step_inferior_states = state; | |
237fc4c9 | 1589 | |
fc1cf338 PA |
1590 | return state; |
1591 | } | |
1592 | ||
a42244db YQ |
1593 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1594 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1595 | return NULL. */ | |
1596 | ||
1597 | struct displaced_step_closure* | |
1598 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1599 | { | |
1600 | struct displaced_step_inferior_state *displaced | |
1601 | = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); | |
1602 | ||
1603 | /* If checking the mode of displaced instruction in copy area. */ | |
1604 | if (displaced && !ptid_equal (displaced->step_ptid, null_ptid) | |
1605 | && (displaced->step_copy == addr)) | |
1606 | return displaced->step_closure; | |
1607 | ||
1608 | return NULL; | |
1609 | } | |
1610 | ||
fc1cf338 | 1611 | /* Remove the displaced stepping state of process PID. */ |
237fc4c9 | 1612 | |
fc1cf338 PA |
1613 | static void |
1614 | remove_displaced_stepping_state (int pid) | |
1615 | { | |
1616 | struct displaced_step_inferior_state *it, **prev_next_p; | |
237fc4c9 | 1617 | |
fc1cf338 PA |
1618 | gdb_assert (pid != 0); |
1619 | ||
1620 | it = displaced_step_inferior_states; | |
1621 | prev_next_p = &displaced_step_inferior_states; | |
1622 | while (it) | |
1623 | { | |
1624 | if (it->pid == pid) | |
1625 | { | |
1626 | *prev_next_p = it->next; | |
1627 | xfree (it); | |
1628 | return; | |
1629 | } | |
1630 | ||
1631 | prev_next_p = &it->next; | |
1632 | it = *prev_next_p; | |
1633 | } | |
1634 | } | |
1635 | ||
1636 | static void | |
1637 | infrun_inferior_exit (struct inferior *inf) | |
1638 | { | |
1639 | remove_displaced_stepping_state (inf->pid); | |
1640 | } | |
237fc4c9 | 1641 | |
fff08868 HZ |
1642 | /* If ON, and the architecture supports it, GDB will use displaced |
1643 | stepping to step over breakpoints. If OFF, or if the architecture | |
1644 | doesn't support it, GDB will instead use the traditional | |
1645 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1646 | decide which technique to use to step over breakpoints depending on | |
1647 | which of all-stop or non-stop mode is active --- displaced stepping | |
1648 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1649 | ||
72d0e2c5 | 1650 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1651 | |
237fc4c9 PA |
1652 | static void |
1653 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1654 | struct cmd_list_element *c, | |
1655 | const char *value) | |
1656 | { | |
72d0e2c5 | 1657 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1658 | fprintf_filtered (file, |
1659 | _("Debugger's willingness to use displaced stepping " | |
1660 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1661 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1662 | else |
3e43a32a MS |
1663 | fprintf_filtered (file, |
1664 | _("Debugger's willingness to use displaced stepping " | |
1665 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1666 | } |
1667 | ||
fff08868 | 1668 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1669 | over breakpoints of thread TP. */ |
fff08868 | 1670 | |
237fc4c9 | 1671 | static int |
3fc8eb30 | 1672 | use_displaced_stepping (struct thread_info *tp) |
237fc4c9 | 1673 | { |
3fc8eb30 PA |
1674 | struct regcache *regcache = get_thread_regcache (tp->ptid); |
1675 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1676 | struct displaced_step_inferior_state *displaced_state; | |
1677 | ||
1678 | displaced_state = get_displaced_stepping_state (ptid_get_pid (tp->ptid)); | |
1679 | ||
fbea99ea PA |
1680 | return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO |
1681 | && target_is_non_stop_p ()) | |
72d0e2c5 | 1682 | || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) |
96429cc8 | 1683 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
3fc8eb30 PA |
1684 | && find_record_target () == NULL |
1685 | && (displaced_state == NULL | |
1686 | || !displaced_state->failed_before)); | |
237fc4c9 PA |
1687 | } |
1688 | ||
1689 | /* Clean out any stray displaced stepping state. */ | |
1690 | static void | |
fc1cf338 | 1691 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1692 | { |
1693 | /* Indicate that there is no cleanup pending. */ | |
fc1cf338 | 1694 | displaced->step_ptid = null_ptid; |
237fc4c9 | 1695 | |
fc1cf338 | 1696 | if (displaced->step_closure) |
237fc4c9 | 1697 | { |
fc1cf338 PA |
1698 | gdbarch_displaced_step_free_closure (displaced->step_gdbarch, |
1699 | displaced->step_closure); | |
1700 | displaced->step_closure = NULL; | |
237fc4c9 PA |
1701 | } |
1702 | } | |
1703 | ||
1704 | static void | |
fc1cf338 | 1705 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1706 | { |
9a3c8263 SM |
1707 | struct displaced_step_inferior_state *state |
1708 | = (struct displaced_step_inferior_state *) arg; | |
fc1cf338 PA |
1709 | |
1710 | displaced_step_clear (state); | |
237fc4c9 PA |
1711 | } |
1712 | ||
1713 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1714 | void | |
1715 | displaced_step_dump_bytes (struct ui_file *file, | |
1716 | const gdb_byte *buf, | |
1717 | size_t len) | |
1718 | { | |
1719 | int i; | |
1720 | ||
1721 | for (i = 0; i < len; i++) | |
1722 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1723 | fputs_unfiltered ("\n", file); | |
1724 | } | |
1725 | ||
1726 | /* Prepare to single-step, using displaced stepping. | |
1727 | ||
1728 | Note that we cannot use displaced stepping when we have a signal to | |
1729 | deliver. If we have a signal to deliver and an instruction to step | |
1730 | over, then after the step, there will be no indication from the | |
1731 | target whether the thread entered a signal handler or ignored the | |
1732 | signal and stepped over the instruction successfully --- both cases | |
1733 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1734 | fixup, and in the second case we must --- but we can't tell which. | |
1735 | Comments in the code for 'random signals' in handle_inferior_event | |
1736 | explain how we handle this case instead. | |
1737 | ||
1738 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1739 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1740 | if this instruction can't be displaced stepped. */ | |
1741 | ||
237fc4c9 | 1742 | static int |
3fc8eb30 | 1743 | displaced_step_prepare_throw (ptid_t ptid) |
237fc4c9 | 1744 | { |
ad53cd71 | 1745 | struct cleanup *old_cleanups, *ignore_cleanups; |
c1e36e3e | 1746 | struct thread_info *tp = find_thread_ptid (ptid); |
237fc4c9 PA |
1747 | struct regcache *regcache = get_thread_regcache (ptid); |
1748 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
d35ae833 | 1749 | struct address_space *aspace = get_regcache_aspace (regcache); |
237fc4c9 PA |
1750 | CORE_ADDR original, copy; |
1751 | ULONGEST len; | |
1752 | struct displaced_step_closure *closure; | |
fc1cf338 | 1753 | struct displaced_step_inferior_state *displaced; |
9e529e1d | 1754 | int status; |
237fc4c9 PA |
1755 | |
1756 | /* We should never reach this function if the architecture does not | |
1757 | support displaced stepping. */ | |
1758 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1759 | ||
c2829269 PA |
1760 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1761 | gdb_assert (tp->control.trap_expected); | |
1762 | ||
c1e36e3e PA |
1763 | /* Disable range stepping while executing in the scratch pad. We |
1764 | want a single-step even if executing the displaced instruction in | |
1765 | the scratch buffer lands within the stepping range (e.g., a | |
1766 | jump/branch). */ | |
1767 | tp->control.may_range_step = 0; | |
1768 | ||
fc1cf338 PA |
1769 | /* We have to displaced step one thread at a time, as we only have |
1770 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1771 | |
fc1cf338 PA |
1772 | displaced = add_displaced_stepping_state (ptid_get_pid (ptid)); |
1773 | ||
1774 | if (!ptid_equal (displaced->step_ptid, null_ptid)) | |
237fc4c9 PA |
1775 | { |
1776 | /* Already waiting for a displaced step to finish. Defer this | |
1777 | request and place in queue. */ | |
237fc4c9 PA |
1778 | |
1779 | if (debug_displaced) | |
1780 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1781 | "displaced: deferring step of %s\n", |
237fc4c9 PA |
1782 | target_pid_to_str (ptid)); |
1783 | ||
c2829269 | 1784 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1785 | return 0; |
1786 | } | |
1787 | else | |
1788 | { | |
1789 | if (debug_displaced) | |
1790 | fprintf_unfiltered (gdb_stdlog, | |
1791 | "displaced: stepping %s now\n", | |
1792 | target_pid_to_str (ptid)); | |
1793 | } | |
1794 | ||
fc1cf338 | 1795 | displaced_step_clear (displaced); |
237fc4c9 | 1796 | |
ad53cd71 PA |
1797 | old_cleanups = save_inferior_ptid (); |
1798 | inferior_ptid = ptid; | |
1799 | ||
515630c5 | 1800 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1801 | |
1802 | copy = gdbarch_displaced_step_location (gdbarch); | |
1803 | len = gdbarch_max_insn_length (gdbarch); | |
1804 | ||
d35ae833 PA |
1805 | if (breakpoint_in_range_p (aspace, copy, len)) |
1806 | { | |
1807 | /* There's a breakpoint set in the scratch pad location range | |
1808 | (which is usually around the entry point). We'd either | |
1809 | install it before resuming, which would overwrite/corrupt the | |
1810 | scratch pad, or if it was already inserted, this displaced | |
1811 | step would overwrite it. The latter is OK in the sense that | |
1812 | we already assume that no thread is going to execute the code | |
1813 | in the scratch pad range (after initial startup) anyway, but | |
1814 | the former is unacceptable. Simply punt and fallback to | |
1815 | stepping over this breakpoint in-line. */ | |
1816 | if (debug_displaced) | |
1817 | { | |
1818 | fprintf_unfiltered (gdb_stdlog, | |
1819 | "displaced: breakpoint set in scratch pad. " | |
1820 | "Stepping over breakpoint in-line instead.\n"); | |
1821 | } | |
1822 | ||
1823 | do_cleanups (old_cleanups); | |
1824 | return -1; | |
1825 | } | |
1826 | ||
237fc4c9 | 1827 | /* Save the original contents of the copy area. */ |
224c3ddb | 1828 | displaced->step_saved_copy = (gdb_byte *) xmalloc (len); |
ad53cd71 | 1829 | ignore_cleanups = make_cleanup (free_current_contents, |
fc1cf338 | 1830 | &displaced->step_saved_copy); |
9e529e1d JK |
1831 | status = target_read_memory (copy, displaced->step_saved_copy, len); |
1832 | if (status != 0) | |
1833 | throw_error (MEMORY_ERROR, | |
1834 | _("Error accessing memory address %s (%s) for " | |
1835 | "displaced-stepping scratch space."), | |
1836 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1837 | if (debug_displaced) |
1838 | { | |
5af949e3 UW |
1839 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1840 | paddress (gdbarch, copy)); | |
fc1cf338 PA |
1841 | displaced_step_dump_bytes (gdb_stdlog, |
1842 | displaced->step_saved_copy, | |
1843 | len); | |
237fc4c9 PA |
1844 | }; |
1845 | ||
1846 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1847 | original, copy, regcache); |
7f03bd92 PA |
1848 | if (closure == NULL) |
1849 | { | |
1850 | /* The architecture doesn't know how or want to displaced step | |
1851 | this instruction or instruction sequence. Fallback to | |
1852 | stepping over the breakpoint in-line. */ | |
1853 | do_cleanups (old_cleanups); | |
1854 | return -1; | |
1855 | } | |
237fc4c9 | 1856 | |
9f5a595d UW |
1857 | /* Save the information we need to fix things up if the step |
1858 | succeeds. */ | |
fc1cf338 PA |
1859 | displaced->step_ptid = ptid; |
1860 | displaced->step_gdbarch = gdbarch; | |
1861 | displaced->step_closure = closure; | |
1862 | displaced->step_original = original; | |
1863 | displaced->step_copy = copy; | |
9f5a595d | 1864 | |
fc1cf338 | 1865 | make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1866 | |
1867 | /* Resume execution at the copy. */ | |
515630c5 | 1868 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1869 | |
ad53cd71 PA |
1870 | discard_cleanups (ignore_cleanups); |
1871 | ||
1872 | do_cleanups (old_cleanups); | |
237fc4c9 PA |
1873 | |
1874 | if (debug_displaced) | |
5af949e3 UW |
1875 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1876 | paddress (gdbarch, copy)); | |
237fc4c9 | 1877 | |
237fc4c9 PA |
1878 | return 1; |
1879 | } | |
1880 | ||
3fc8eb30 PA |
1881 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1882 | attempts at displaced stepping if we get a memory error. */ | |
1883 | ||
1884 | static int | |
1885 | displaced_step_prepare (ptid_t ptid) | |
1886 | { | |
1887 | int prepared = -1; | |
1888 | ||
1889 | TRY | |
1890 | { | |
1891 | prepared = displaced_step_prepare_throw (ptid); | |
1892 | } | |
1893 | CATCH (ex, RETURN_MASK_ERROR) | |
1894 | { | |
1895 | struct displaced_step_inferior_state *displaced_state; | |
1896 | ||
1897 | if (ex.error != MEMORY_ERROR) | |
1898 | throw_exception (ex); | |
1899 | ||
1900 | if (debug_infrun) | |
1901 | { | |
1902 | fprintf_unfiltered (gdb_stdlog, | |
1903 | "infrun: disabling displaced stepping: %s\n", | |
1904 | ex.message); | |
1905 | } | |
1906 | ||
1907 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1908 | "auto". */ | |
1909 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1910 | { | |
fd7dcb94 | 1911 | warning (_("disabling displaced stepping: %s"), |
3fc8eb30 PA |
1912 | ex.message); |
1913 | } | |
1914 | ||
1915 | /* Disable further displaced stepping attempts. */ | |
1916 | displaced_state | |
1917 | = get_displaced_stepping_state (ptid_get_pid (ptid)); | |
1918 | displaced_state->failed_before = 1; | |
1919 | } | |
1920 | END_CATCH | |
1921 | ||
1922 | return prepared; | |
1923 | } | |
1924 | ||
237fc4c9 | 1925 | static void |
3e43a32a MS |
1926 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1927 | const gdb_byte *myaddr, int len) | |
237fc4c9 PA |
1928 | { |
1929 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
abbb1732 | 1930 | |
237fc4c9 PA |
1931 | inferior_ptid = ptid; |
1932 | write_memory (memaddr, myaddr, len); | |
1933 | do_cleanups (ptid_cleanup); | |
1934 | } | |
1935 | ||
e2d96639 YQ |
1936 | /* Restore the contents of the copy area for thread PTID. */ |
1937 | ||
1938 | static void | |
1939 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1940 | ptid_t ptid) | |
1941 | { | |
1942 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1943 | ||
1944 | write_memory_ptid (ptid, displaced->step_copy, | |
1945 | displaced->step_saved_copy, len); | |
1946 | if (debug_displaced) | |
1947 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
1948 | target_pid_to_str (ptid), | |
1949 | paddress (displaced->step_gdbarch, | |
1950 | displaced->step_copy)); | |
1951 | } | |
1952 | ||
372316f1 PA |
1953 | /* If we displaced stepped an instruction successfully, adjust |
1954 | registers and memory to yield the same effect the instruction would | |
1955 | have had if we had executed it at its original address, and return | |
1956 | 1. If the instruction didn't complete, relocate the PC and return | |
1957 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1958 | ||
1959 | static int | |
2ea28649 | 1960 | displaced_step_fixup (ptid_t event_ptid, enum gdb_signal signal) |
237fc4c9 PA |
1961 | { |
1962 | struct cleanup *old_cleanups; | |
fc1cf338 PA |
1963 | struct displaced_step_inferior_state *displaced |
1964 | = get_displaced_stepping_state (ptid_get_pid (event_ptid)); | |
372316f1 | 1965 | int ret; |
fc1cf338 PA |
1966 | |
1967 | /* Was any thread of this process doing a displaced step? */ | |
1968 | if (displaced == NULL) | |
372316f1 | 1969 | return 0; |
237fc4c9 PA |
1970 | |
1971 | /* Was this event for the pid we displaced? */ | |
fc1cf338 PA |
1972 | if (ptid_equal (displaced->step_ptid, null_ptid) |
1973 | || ! ptid_equal (displaced->step_ptid, event_ptid)) | |
372316f1 | 1974 | return 0; |
237fc4c9 | 1975 | |
fc1cf338 | 1976 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 | 1977 | |
e2d96639 | 1978 | displaced_step_restore (displaced, displaced->step_ptid); |
237fc4c9 | 1979 | |
cb71640d PA |
1980 | /* Fixup may need to read memory/registers. Switch to the thread |
1981 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
1982 | the current thread. */ | |
1983 | switch_to_thread (event_ptid); | |
1984 | ||
237fc4c9 | 1985 | /* Did the instruction complete successfully? */ |
cb71640d PA |
1986 | if (signal == GDB_SIGNAL_TRAP |
1987 | && !(target_stopped_by_watchpoint () | |
1988 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
1989 | || target_have_steppable_watchpoint))) | |
237fc4c9 PA |
1990 | { |
1991 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
1992 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
1993 | displaced->step_closure, | |
1994 | displaced->step_original, | |
1995 | displaced->step_copy, | |
1996 | get_thread_regcache (displaced->step_ptid)); | |
372316f1 | 1997 | ret = 1; |
237fc4c9 PA |
1998 | } |
1999 | else | |
2000 | { | |
2001 | /* Since the instruction didn't complete, all we can do is | |
2002 | relocate the PC. */ | |
515630c5 UW |
2003 | struct regcache *regcache = get_thread_regcache (event_ptid); |
2004 | CORE_ADDR pc = regcache_read_pc (regcache); | |
abbb1732 | 2005 | |
fc1cf338 | 2006 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 2007 | regcache_write_pc (regcache, pc); |
372316f1 | 2008 | ret = -1; |
237fc4c9 PA |
2009 | } |
2010 | ||
2011 | do_cleanups (old_cleanups); | |
2012 | ||
fc1cf338 | 2013 | displaced->step_ptid = null_ptid; |
372316f1 PA |
2014 | |
2015 | return ret; | |
c2829269 | 2016 | } |
1c5cfe86 | 2017 | |
4d9d9d04 PA |
2018 | /* Data to be passed around while handling an event. This data is |
2019 | discarded between events. */ | |
2020 | struct execution_control_state | |
2021 | { | |
2022 | ptid_t ptid; | |
2023 | /* The thread that got the event, if this was a thread event; NULL | |
2024 | otherwise. */ | |
2025 | struct thread_info *event_thread; | |
2026 | ||
2027 | struct target_waitstatus ws; | |
2028 | int stop_func_filled_in; | |
2029 | CORE_ADDR stop_func_start; | |
2030 | CORE_ADDR stop_func_end; | |
2031 | const char *stop_func_name; | |
2032 | int wait_some_more; | |
2033 | ||
2034 | /* True if the event thread hit the single-step breakpoint of | |
2035 | another thread. Thus the event doesn't cause a stop, the thread | |
2036 | needs to be single-stepped past the single-step breakpoint before | |
2037 | we can switch back to the original stepping thread. */ | |
2038 | int hit_singlestep_breakpoint; | |
2039 | }; | |
2040 | ||
2041 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
2042 | |
2043 | static void | |
4d9d9d04 PA |
2044 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
2045 | { | |
2046 | memset (ecs, 0, sizeof (*ecs)); | |
2047 | ecs->event_thread = tp; | |
2048 | ecs->ptid = tp->ptid; | |
2049 | } | |
2050 | ||
2051 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
2052 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 2053 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 2054 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
2055 | |
2056 | /* Are there any pending step-over requests? If so, run all we can | |
2057 | now and return true. Otherwise, return false. */ | |
2058 | ||
2059 | static int | |
c2829269 PA |
2060 | start_step_over (void) |
2061 | { | |
2062 | struct thread_info *tp, *next; | |
2063 | ||
372316f1 PA |
2064 | /* Don't start a new step-over if we already have an in-line |
2065 | step-over operation ongoing. */ | |
2066 | if (step_over_info_valid_p ()) | |
2067 | return 0; | |
2068 | ||
c2829269 | 2069 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 2070 | { |
4d9d9d04 PA |
2071 | struct execution_control_state ecss; |
2072 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 2073 | step_over_what step_what; |
372316f1 | 2074 | int must_be_in_line; |
c2829269 PA |
2075 | |
2076 | next = thread_step_over_chain_next (tp); | |
237fc4c9 | 2077 | |
c2829269 PA |
2078 | /* If this inferior already has a displaced step in process, |
2079 | don't start a new one. */ | |
4d9d9d04 | 2080 | if (displaced_step_in_progress (ptid_get_pid (tp->ptid))) |
c2829269 PA |
2081 | continue; |
2082 | ||
372316f1 PA |
2083 | step_what = thread_still_needs_step_over (tp); |
2084 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
2085 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 2086 | && !use_displaced_stepping (tp))); |
372316f1 PA |
2087 | |
2088 | /* We currently stop all threads of all processes to step-over | |
2089 | in-line. If we need to start a new in-line step-over, let | |
2090 | any pending displaced steps finish first. */ | |
2091 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
2092 | return 0; | |
2093 | ||
c2829269 PA |
2094 | thread_step_over_chain_remove (tp); |
2095 | ||
2096 | if (step_over_queue_head == NULL) | |
2097 | { | |
2098 | if (debug_infrun) | |
2099 | fprintf_unfiltered (gdb_stdlog, | |
2100 | "infrun: step-over queue now empty\n"); | |
2101 | } | |
2102 | ||
372316f1 PA |
2103 | if (tp->control.trap_expected |
2104 | || tp->resumed | |
2105 | || tp->executing) | |
ad53cd71 | 2106 | { |
4d9d9d04 PA |
2107 | internal_error (__FILE__, __LINE__, |
2108 | "[%s] has inconsistent state: " | |
372316f1 | 2109 | "trap_expected=%d, resumed=%d, executing=%d\n", |
4d9d9d04 PA |
2110 | target_pid_to_str (tp->ptid), |
2111 | tp->control.trap_expected, | |
372316f1 | 2112 | tp->resumed, |
4d9d9d04 | 2113 | tp->executing); |
ad53cd71 | 2114 | } |
1c5cfe86 | 2115 | |
4d9d9d04 PA |
2116 | if (debug_infrun) |
2117 | fprintf_unfiltered (gdb_stdlog, | |
2118 | "infrun: resuming [%s] for step-over\n", | |
2119 | target_pid_to_str (tp->ptid)); | |
2120 | ||
2121 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2122 | is no longer inserted. In all-stop, we want to keep looking | |
2123 | for a thread that needs a step-over instead of resuming TP, | |
2124 | because we wouldn't be able to resume anything else until the | |
2125 | target stops again. In non-stop, the resume always resumes | |
2126 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2127 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2128 | continue; |
8550d3b3 | 2129 | |
4d9d9d04 PA |
2130 | switch_to_thread (tp->ptid); |
2131 | reset_ecs (ecs, tp); | |
2132 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2133 | |
4d9d9d04 PA |
2134 | if (!ecs->wait_some_more) |
2135 | error (_("Command aborted.")); | |
1c5cfe86 | 2136 | |
372316f1 PA |
2137 | gdb_assert (tp->resumed); |
2138 | ||
2139 | /* If we started a new in-line step-over, we're done. */ | |
2140 | if (step_over_info_valid_p ()) | |
2141 | { | |
2142 | gdb_assert (tp->control.trap_expected); | |
2143 | return 1; | |
2144 | } | |
2145 | ||
fbea99ea | 2146 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2147 | { |
2148 | /* On all-stop, shouldn't have resumed unless we needed a | |
2149 | step over. */ | |
2150 | gdb_assert (tp->control.trap_expected | |
2151 | || tp->step_after_step_resume_breakpoint); | |
2152 | ||
2153 | /* With remote targets (at least), in all-stop, we can't | |
2154 | issue any further remote commands until the program stops | |
2155 | again. */ | |
2156 | return 1; | |
1c5cfe86 | 2157 | } |
c2829269 | 2158 | |
4d9d9d04 PA |
2159 | /* Either the thread no longer needed a step-over, or a new |
2160 | displaced stepping sequence started. Even in the latter | |
2161 | case, continue looking. Maybe we can also start another | |
2162 | displaced step on a thread of other process. */ | |
237fc4c9 | 2163 | } |
4d9d9d04 PA |
2164 | |
2165 | return 0; | |
237fc4c9 PA |
2166 | } |
2167 | ||
5231c1fd PA |
2168 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2169 | holding OLD_PTID. */ | |
2170 | static void | |
2171 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2172 | { | |
2173 | struct displaced_step_request *it; | |
fc1cf338 | 2174 | struct displaced_step_inferior_state *displaced; |
5231c1fd PA |
2175 | |
2176 | if (ptid_equal (inferior_ptid, old_ptid)) | |
2177 | inferior_ptid = new_ptid; | |
2178 | ||
fc1cf338 PA |
2179 | for (displaced = displaced_step_inferior_states; |
2180 | displaced; | |
2181 | displaced = displaced->next) | |
2182 | { | |
2183 | if (ptid_equal (displaced->step_ptid, old_ptid)) | |
2184 | displaced->step_ptid = new_ptid; | |
fc1cf338 | 2185 | } |
5231c1fd PA |
2186 | } |
2187 | ||
237fc4c9 PA |
2188 | \f |
2189 | /* Resuming. */ | |
c906108c SS |
2190 | |
2191 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 2192 | static void |
74b7792f | 2193 | resume_cleanups (void *ignore) |
c906108c | 2194 | { |
34b7e8a6 PA |
2195 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2196 | delete_single_step_breakpoints (inferior_thread ()); | |
7c16b83e | 2197 | |
c906108c SS |
2198 | normal_stop (); |
2199 | } | |
2200 | ||
53904c9e AC |
2201 | static const char schedlock_off[] = "off"; |
2202 | static const char schedlock_on[] = "on"; | |
2203 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2204 | static const char schedlock_replay[] = "replay"; |
40478521 | 2205 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2206 | schedlock_off, |
2207 | schedlock_on, | |
2208 | schedlock_step, | |
f2665db5 | 2209 | schedlock_replay, |
ef346e04 AC |
2210 | NULL |
2211 | }; | |
f2665db5 | 2212 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2213 | static void |
2214 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2215 | struct cmd_list_element *c, const char *value) | |
2216 | { | |
3e43a32a MS |
2217 | fprintf_filtered (file, |
2218 | _("Mode for locking scheduler " | |
2219 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2220 | value); |
2221 | } | |
c906108c SS |
2222 | |
2223 | static void | |
96baa820 | 2224 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2225 | { |
eefe576e AC |
2226 | if (!target_can_lock_scheduler) |
2227 | { | |
2228 | scheduler_mode = schedlock_off; | |
2229 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2230 | } | |
c906108c SS |
2231 | } |
2232 | ||
d4db2f36 PA |
2233 | /* True if execution commands resume all threads of all processes by |
2234 | default; otherwise, resume only threads of the current inferior | |
2235 | process. */ | |
2236 | int sched_multi = 0; | |
2237 | ||
2facfe5c DD |
2238 | /* Try to setup for software single stepping over the specified location. |
2239 | Return 1 if target_resume() should use hardware single step. | |
2240 | ||
2241 | GDBARCH the current gdbarch. | |
2242 | PC the location to step over. */ | |
2243 | ||
2244 | static int | |
2245 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2246 | { | |
2247 | int hw_step = 1; | |
2248 | ||
f02253f1 HZ |
2249 | if (execution_direction == EXEC_FORWARD |
2250 | && gdbarch_software_single_step_p (gdbarch) | |
99e40580 | 2251 | && gdbarch_software_single_step (gdbarch, get_current_frame ())) |
2facfe5c | 2252 | { |
99e40580 | 2253 | hw_step = 0; |
2facfe5c DD |
2254 | } |
2255 | return hw_step; | |
2256 | } | |
c906108c | 2257 | |
f3263aa4 PA |
2258 | /* See infrun.h. */ |
2259 | ||
09cee04b PA |
2260 | ptid_t |
2261 | user_visible_resume_ptid (int step) | |
2262 | { | |
f3263aa4 | 2263 | ptid_t resume_ptid; |
09cee04b | 2264 | |
09cee04b PA |
2265 | if (non_stop) |
2266 | { | |
2267 | /* With non-stop mode on, threads are always handled | |
2268 | individually. */ | |
2269 | resume_ptid = inferior_ptid; | |
2270 | } | |
2271 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2272 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2273 | { |
f3263aa4 PA |
2274 | /* User-settable 'scheduler' mode requires solo thread |
2275 | resume. */ | |
09cee04b PA |
2276 | resume_ptid = inferior_ptid; |
2277 | } | |
f2665db5 MM |
2278 | else if ((scheduler_mode == schedlock_replay) |
2279 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2280 | { | |
2281 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2282 | mode. */ | |
2283 | resume_ptid = inferior_ptid; | |
2284 | } | |
f3263aa4 PA |
2285 | else if (!sched_multi && target_supports_multi_process ()) |
2286 | { | |
2287 | /* Resume all threads of the current process (and none of other | |
2288 | processes). */ | |
2289 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
2290 | } | |
2291 | else | |
2292 | { | |
2293 | /* Resume all threads of all processes. */ | |
2294 | resume_ptid = RESUME_ALL; | |
2295 | } | |
09cee04b PA |
2296 | |
2297 | return resume_ptid; | |
2298 | } | |
2299 | ||
fbea99ea PA |
2300 | /* Return a ptid representing the set of threads that we will resume, |
2301 | in the perspective of the target, assuming run control handling | |
2302 | does not require leaving some threads stopped (e.g., stepping past | |
2303 | breakpoint). USER_STEP indicates whether we're about to start the | |
2304 | target for a stepping command. */ | |
2305 | ||
2306 | static ptid_t | |
2307 | internal_resume_ptid (int user_step) | |
2308 | { | |
2309 | /* In non-stop, we always control threads individually. Note that | |
2310 | the target may always work in non-stop mode even with "set | |
2311 | non-stop off", in which case user_visible_resume_ptid could | |
2312 | return a wildcard ptid. */ | |
2313 | if (target_is_non_stop_p ()) | |
2314 | return inferior_ptid; | |
2315 | else | |
2316 | return user_visible_resume_ptid (user_step); | |
2317 | } | |
2318 | ||
64ce06e4 PA |
2319 | /* Wrapper for target_resume, that handles infrun-specific |
2320 | bookkeeping. */ | |
2321 | ||
2322 | static void | |
2323 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2324 | { | |
2325 | struct thread_info *tp = inferior_thread (); | |
2326 | ||
2327 | /* Install inferior's terminal modes. */ | |
2328 | target_terminal_inferior (); | |
2329 | ||
2330 | /* Avoid confusing the next resume, if the next stop/resume | |
2331 | happens to apply to another thread. */ | |
2332 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2333 | ||
8f572e5c PA |
2334 | /* Advise target which signals may be handled silently. |
2335 | ||
2336 | If we have removed breakpoints because we are stepping over one | |
2337 | in-line (in any thread), we need to receive all signals to avoid | |
2338 | accidentally skipping a breakpoint during execution of a signal | |
2339 | handler. | |
2340 | ||
2341 | Likewise if we're displaced stepping, otherwise a trap for a | |
2342 | breakpoint in a signal handler might be confused with the | |
2343 | displaced step finishing. We don't make the displaced_step_fixup | |
2344 | step distinguish the cases instead, because: | |
2345 | ||
2346 | - a backtrace while stopped in the signal handler would show the | |
2347 | scratch pad as frame older than the signal handler, instead of | |
2348 | the real mainline code. | |
2349 | ||
2350 | - when the thread is later resumed, the signal handler would | |
2351 | return to the scratch pad area, which would no longer be | |
2352 | valid. */ | |
2353 | if (step_over_info_valid_p () | |
2354 | || displaced_step_in_progress (ptid_get_pid (tp->ptid))) | |
64ce06e4 PA |
2355 | target_pass_signals (0, NULL); |
2356 | else | |
2357 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
2358 | ||
2359 | target_resume (resume_ptid, step, sig); | |
2360 | } | |
2361 | ||
c906108c SS |
2362 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
2363 | wants to interrupt some lengthy single-stepping operation | |
2364 | (for child processes, the SIGINT goes to the inferior, and so | |
2365 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
2366 | other targets, that's not true). | |
2367 | ||
c906108c SS |
2368 | SIG is the signal to give the inferior (zero for none). */ |
2369 | void | |
64ce06e4 | 2370 | resume (enum gdb_signal sig) |
c906108c | 2371 | { |
74b7792f | 2372 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
2373 | struct regcache *regcache = get_current_regcache (); |
2374 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4e1c45ea | 2375 | struct thread_info *tp = inferior_thread (); |
515630c5 | 2376 | CORE_ADDR pc = regcache_read_pc (regcache); |
6c95b8df | 2377 | struct address_space *aspace = get_regcache_aspace (regcache); |
b0f16a3e | 2378 | ptid_t resume_ptid; |
856e7dd6 PA |
2379 | /* This represents the user's step vs continue request. When |
2380 | deciding whether "set scheduler-locking step" applies, it's the | |
2381 | user's intention that counts. */ | |
2382 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2383 | /* This represents what we'll actually request the target to do. |
2384 | This can decay from a step to a continue, if e.g., we need to | |
2385 | implement single-stepping with breakpoints (software | |
2386 | single-step). */ | |
6b403daa | 2387 | int step; |
c7e8a53c | 2388 | |
c2829269 PA |
2389 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2390 | ||
c906108c SS |
2391 | QUIT; |
2392 | ||
372316f1 PA |
2393 | if (tp->suspend.waitstatus_pending_p) |
2394 | { | |
2395 | if (debug_infrun) | |
2396 | { | |
2397 | char *statstr; | |
2398 | ||
2399 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
2400 | fprintf_unfiltered (gdb_stdlog, | |
2401 | "infrun: resume: thread %s has pending wait status %s " | |
2402 | "(currently_stepping=%d).\n", | |
2403 | target_pid_to_str (tp->ptid), statstr, | |
2404 | currently_stepping (tp)); | |
2405 | xfree (statstr); | |
2406 | } | |
2407 | ||
2408 | tp->resumed = 1; | |
2409 | ||
2410 | /* FIXME: What should we do if we are supposed to resume this | |
2411 | thread with a signal? Maybe we should maintain a queue of | |
2412 | pending signals to deliver. */ | |
2413 | if (sig != GDB_SIGNAL_0) | |
2414 | { | |
fd7dcb94 | 2415 | warning (_("Couldn't deliver signal %s to %s."), |
372316f1 PA |
2416 | gdb_signal_to_name (sig), target_pid_to_str (tp->ptid)); |
2417 | } | |
2418 | ||
2419 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2420 | discard_cleanups (old_cleanups); | |
2421 | ||
2422 | if (target_can_async_p ()) | |
2423 | target_async (1); | |
2424 | return; | |
2425 | } | |
2426 | ||
2427 | tp->stepped_breakpoint = 0; | |
2428 | ||
6b403daa PA |
2429 | /* Depends on stepped_breakpoint. */ |
2430 | step = currently_stepping (tp); | |
2431 | ||
74609e71 YQ |
2432 | if (current_inferior ()->waiting_for_vfork_done) |
2433 | { | |
48f9886d PA |
2434 | /* Don't try to single-step a vfork parent that is waiting for |
2435 | the child to get out of the shared memory region (by exec'ing | |
2436 | or exiting). This is particularly important on software | |
2437 | single-step archs, as the child process would trip on the | |
2438 | software single step breakpoint inserted for the parent | |
2439 | process. Since the parent will not actually execute any | |
2440 | instruction until the child is out of the shared region (such | |
2441 | are vfork's semantics), it is safe to simply continue it. | |
2442 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2443 | the parent, and tell it to `keep_going', which automatically | |
2444 | re-sets it stepping. */ | |
74609e71 YQ |
2445 | if (debug_infrun) |
2446 | fprintf_unfiltered (gdb_stdlog, | |
2447 | "infrun: resume : clear step\n"); | |
a09dd441 | 2448 | step = 0; |
74609e71 YQ |
2449 | } |
2450 | ||
527159b7 | 2451 | if (debug_infrun) |
237fc4c9 | 2452 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 2453 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 2454 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
2455 | step, gdb_signal_to_symbol_string (sig), |
2456 | tp->control.trap_expected, | |
0d9a9a5f PA |
2457 | target_pid_to_str (inferior_ptid), |
2458 | paddress (gdbarch, pc)); | |
c906108c | 2459 | |
c2c6d25f JM |
2460 | /* Normally, by the time we reach `resume', the breakpoints are either |
2461 | removed or inserted, as appropriate. The exception is if we're sitting | |
2462 | at a permanent breakpoint; we need to step over it, but permanent | |
2463 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2464 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2465 | { |
af48d08f PA |
2466 | if (sig != GDB_SIGNAL_0) |
2467 | { | |
2468 | /* We have a signal to pass to the inferior. The resume | |
2469 | may, or may not take us to the signal handler. If this | |
2470 | is a step, we'll need to stop in the signal handler, if | |
2471 | there's one, (if the target supports stepping into | |
2472 | handlers), or in the next mainline instruction, if | |
2473 | there's no handler. If this is a continue, we need to be | |
2474 | sure to run the handler with all breakpoints inserted. | |
2475 | In all cases, set a breakpoint at the current address | |
2476 | (where the handler returns to), and once that breakpoint | |
2477 | is hit, resume skipping the permanent breakpoint. If | |
2478 | that breakpoint isn't hit, then we've stepped into the | |
2479 | signal handler (or hit some other event). We'll delete | |
2480 | the step-resume breakpoint then. */ | |
2481 | ||
2482 | if (debug_infrun) | |
2483 | fprintf_unfiltered (gdb_stdlog, | |
2484 | "infrun: resume: skipping permanent breakpoint, " | |
2485 | "deliver signal first\n"); | |
2486 | ||
2487 | clear_step_over_info (); | |
2488 | tp->control.trap_expected = 0; | |
2489 | ||
2490 | if (tp->control.step_resume_breakpoint == NULL) | |
2491 | { | |
2492 | /* Set a "high-priority" step-resume, as we don't want | |
2493 | user breakpoints at PC to trigger (again) when this | |
2494 | hits. */ | |
2495 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2496 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2497 | ||
2498 | tp->step_after_step_resume_breakpoint = step; | |
2499 | } | |
2500 | ||
2501 | insert_breakpoints (); | |
2502 | } | |
2503 | else | |
2504 | { | |
2505 | /* There's no signal to pass, we can go ahead and skip the | |
2506 | permanent breakpoint manually. */ | |
2507 | if (debug_infrun) | |
2508 | fprintf_unfiltered (gdb_stdlog, | |
2509 | "infrun: resume: skipping permanent breakpoint\n"); | |
2510 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
2511 | /* Update pc to reflect the new address from which we will | |
2512 | execute instructions. */ | |
2513 | pc = regcache_read_pc (regcache); | |
2514 | ||
2515 | if (step) | |
2516 | { | |
2517 | /* We've already advanced the PC, so the stepping part | |
2518 | is done. Now we need to arrange for a trap to be | |
2519 | reported to handle_inferior_event. Set a breakpoint | |
2520 | at the current PC, and run to it. Don't update | |
2521 | prev_pc, because if we end in | |
44a1ee51 PA |
2522 | switch_back_to_stepped_thread, we want the "expected |
2523 | thread advanced also" branch to be taken. IOW, we | |
2524 | don't want this thread to step further from PC | |
af48d08f | 2525 | (overstep). */ |
1ac806b8 | 2526 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2527 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2528 | insert_breakpoints (); | |
2529 | ||
fbea99ea | 2530 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2531 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
af48d08f | 2532 | discard_cleanups (old_cleanups); |
372316f1 | 2533 | tp->resumed = 1; |
af48d08f PA |
2534 | return; |
2535 | } | |
2536 | } | |
6d350bb5 | 2537 | } |
c2c6d25f | 2538 | |
c1e36e3e PA |
2539 | /* If we have a breakpoint to step over, make sure to do a single |
2540 | step only. Same if we have software watchpoints. */ | |
2541 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2542 | tp->control.may_range_step = 0; | |
2543 | ||
237fc4c9 PA |
2544 | /* If enabled, step over breakpoints by executing a copy of the |
2545 | instruction at a different address. | |
2546 | ||
2547 | We can't use displaced stepping when we have a signal to deliver; | |
2548 | the comments for displaced_step_prepare explain why. The | |
2549 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2550 | signals' explain what we do instead. |
2551 | ||
2552 | We can't use displaced stepping when we are waiting for vfork_done | |
2553 | event, displaced stepping breaks the vfork child similarly as single | |
2554 | step software breakpoint. */ | |
3fc8eb30 PA |
2555 | if (tp->control.trap_expected |
2556 | && use_displaced_stepping (tp) | |
cb71640d | 2557 | && !step_over_info_valid_p () |
a493e3e2 | 2558 | && sig == GDB_SIGNAL_0 |
74609e71 | 2559 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2560 | { |
3fc8eb30 | 2561 | int prepared = displaced_step_prepare (inferior_ptid); |
fc1cf338 | 2562 | |
3fc8eb30 | 2563 | if (prepared == 0) |
d56b7306 | 2564 | { |
4d9d9d04 PA |
2565 | if (debug_infrun) |
2566 | fprintf_unfiltered (gdb_stdlog, | |
2567 | "Got placed in step-over queue\n"); | |
2568 | ||
2569 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2570 | discard_cleanups (old_cleanups); |
2571 | return; | |
2572 | } | |
3fc8eb30 PA |
2573 | else if (prepared < 0) |
2574 | { | |
2575 | /* Fallback to stepping over the breakpoint in-line. */ | |
2576 | ||
2577 | if (target_is_non_stop_p ()) | |
2578 | stop_all_threads (); | |
2579 | ||
2580 | set_step_over_info (get_regcache_aspace (regcache), | |
2581 | regcache_read_pc (regcache), 0); | |
2582 | ||
2583 | step = maybe_software_singlestep (gdbarch, pc); | |
2584 | ||
2585 | insert_breakpoints (); | |
2586 | } | |
2587 | else if (prepared > 0) | |
2588 | { | |
2589 | struct displaced_step_inferior_state *displaced; | |
99e40580 | 2590 | |
3fc8eb30 PA |
2591 | /* Update pc to reflect the new address from which we will |
2592 | execute instructions due to displaced stepping. */ | |
2593 | pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); | |
ca7781d2 | 2594 | |
3fc8eb30 PA |
2595 | displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); |
2596 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, | |
2597 | displaced->step_closure); | |
2598 | } | |
237fc4c9 PA |
2599 | } |
2600 | ||
2facfe5c | 2601 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2602 | else if (step) |
2facfe5c | 2603 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2604 | |
30852783 UW |
2605 | /* Currently, our software single-step implementation leads to different |
2606 | results than hardware single-stepping in one situation: when stepping | |
2607 | into delivering a signal which has an associated signal handler, | |
2608 | hardware single-step will stop at the first instruction of the handler, | |
2609 | while software single-step will simply skip execution of the handler. | |
2610 | ||
2611 | For now, this difference in behavior is accepted since there is no | |
2612 | easy way to actually implement single-stepping into a signal handler | |
2613 | without kernel support. | |
2614 | ||
2615 | However, there is one scenario where this difference leads to follow-on | |
2616 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2617 | and then single-stepping. In this case, the software single-step | |
2618 | behavior means that even if there is a *breakpoint* in the signal | |
2619 | handler, GDB still would not stop. | |
2620 | ||
2621 | Fortunately, we can at least fix this particular issue. We detect | |
2622 | here the case where we are about to deliver a signal while software | |
2623 | single-stepping with breakpoints removed. In this situation, we | |
2624 | revert the decisions to remove all breakpoints and insert single- | |
2625 | step breakpoints, and instead we install a step-resume breakpoint | |
2626 | at the current address, deliver the signal without stepping, and | |
2627 | once we arrive back at the step-resume breakpoint, actually step | |
2628 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2629 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2630 | && sig != GDB_SIGNAL_0 |
2631 | && step_over_info_valid_p ()) | |
30852783 UW |
2632 | { |
2633 | /* If we have nested signals or a pending signal is delivered | |
2634 | immediately after a handler returns, might might already have | |
2635 | a step-resume breakpoint set on the earlier handler. We cannot | |
2636 | set another step-resume breakpoint; just continue on until the | |
2637 | original breakpoint is hit. */ | |
2638 | if (tp->control.step_resume_breakpoint == NULL) | |
2639 | { | |
2c03e5be | 2640 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2641 | tp->step_after_step_resume_breakpoint = 1; |
2642 | } | |
2643 | ||
34b7e8a6 | 2644 | delete_single_step_breakpoints (tp); |
30852783 | 2645 | |
31e77af2 | 2646 | clear_step_over_info (); |
30852783 | 2647 | tp->control.trap_expected = 0; |
31e77af2 PA |
2648 | |
2649 | insert_breakpoints (); | |
30852783 UW |
2650 | } |
2651 | ||
b0f16a3e SM |
2652 | /* If STEP is set, it's a request to use hardware stepping |
2653 | facilities. But in that case, we should never | |
2654 | use singlestep breakpoint. */ | |
34b7e8a6 | 2655 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2656 | |
fbea99ea | 2657 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2658 | if (tp->control.trap_expected) |
b0f16a3e SM |
2659 | { |
2660 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2661 | hit, either by single-stepping the thread with the breakpoint |
2662 | removed, or by displaced stepping, with the breakpoint inserted. | |
2663 | In the former case, we need to single-step only this thread, | |
2664 | and keep others stopped, as they can miss this breakpoint if | |
2665 | allowed to run. That's not really a problem for displaced | |
2666 | stepping, but, we still keep other threads stopped, in case | |
2667 | another thread is also stopped for a breakpoint waiting for | |
2668 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2669 | resume_ptid = inferior_ptid; |
2670 | } | |
fbea99ea PA |
2671 | else |
2672 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2673 | |
7f5ef605 PA |
2674 | if (execution_direction != EXEC_REVERSE |
2675 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2676 | { |
372316f1 PA |
2677 | /* There are two cases where we currently need to step a |
2678 | breakpoint instruction when we have a signal to deliver: | |
2679 | ||
2680 | - See handle_signal_stop where we handle random signals that | |
2681 | could take out us out of the stepping range. Normally, in | |
2682 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2683 | signal handler with a breakpoint at PC, but there are cases |
2684 | where we should _always_ single-step, even if we have a | |
2685 | step-resume breakpoint, like when a software watchpoint is | |
2686 | set. Assuming single-stepping and delivering a signal at the | |
2687 | same time would takes us to the signal handler, then we could | |
2688 | have removed the breakpoint at PC to step over it. However, | |
2689 | some hardware step targets (like e.g., Mac OS) can't step | |
2690 | into signal handlers, and for those, we need to leave the | |
2691 | breakpoint at PC inserted, as otherwise if the handler | |
2692 | recurses and executes PC again, it'll miss the breakpoint. | |
2693 | So we leave the breakpoint inserted anyway, but we need to | |
2694 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2695 | that adjust_pc_after_break doesn't end up confused. |
2696 | ||
2697 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2698 | in one thread after another thread that was stepping had been | |
2699 | momentarily paused for a step-over. When we re-resume the | |
2700 | stepping thread, it may be resumed from that address with a | |
2701 | breakpoint that hasn't trapped yet. Seen with | |
2702 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2703 | do displaced stepping. */ | |
2704 | ||
2705 | if (debug_infrun) | |
2706 | fprintf_unfiltered (gdb_stdlog, | |
2707 | "infrun: resume: [%s] stepped breakpoint\n", | |
2708 | target_pid_to_str (tp->ptid)); | |
7f5ef605 PA |
2709 | |
2710 | tp->stepped_breakpoint = 1; | |
2711 | ||
b0f16a3e SM |
2712 | /* Most targets can step a breakpoint instruction, thus |
2713 | executing it normally. But if this one cannot, just | |
2714 | continue and we will hit it anyway. */ | |
7f5ef605 | 2715 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2716 | step = 0; |
2717 | } | |
ef5cf84e | 2718 | |
b0f16a3e | 2719 | if (debug_displaced |
cb71640d | 2720 | && tp->control.trap_expected |
3fc8eb30 | 2721 | && use_displaced_stepping (tp) |
cb71640d | 2722 | && !step_over_info_valid_p ()) |
b0f16a3e | 2723 | { |
d9b67d9f | 2724 | struct regcache *resume_regcache = get_thread_regcache (tp->ptid); |
b0f16a3e SM |
2725 | struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache); |
2726 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); | |
2727 | gdb_byte buf[4]; | |
2728 | ||
2729 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2730 | paddress (resume_gdbarch, actual_pc)); | |
2731 | read_memory (actual_pc, buf, sizeof (buf)); | |
2732 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2733 | } | |
237fc4c9 | 2734 | |
b0f16a3e SM |
2735 | if (tp->control.may_range_step) |
2736 | { | |
2737 | /* If we're resuming a thread with the PC out of the step | |
2738 | range, then we're doing some nested/finer run control | |
2739 | operation, like stepping the thread out of the dynamic | |
2740 | linker or the displaced stepping scratch pad. We | |
2741 | shouldn't have allowed a range step then. */ | |
2742 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2743 | } | |
c1e36e3e | 2744 | |
64ce06e4 | 2745 | do_target_resume (resume_ptid, step, sig); |
372316f1 | 2746 | tp->resumed = 1; |
c906108c SS |
2747 | discard_cleanups (old_cleanups); |
2748 | } | |
2749 | \f | |
237fc4c9 | 2750 | /* Proceeding. */ |
c906108c | 2751 | |
4c2f2a79 PA |
2752 | /* See infrun.h. */ |
2753 | ||
2754 | /* Counter that tracks number of user visible stops. This can be used | |
2755 | to tell whether a command has proceeded the inferior past the | |
2756 | current location. This allows e.g., inferior function calls in | |
2757 | breakpoint commands to not interrupt the command list. When the | |
2758 | call finishes successfully, the inferior is standing at the same | |
2759 | breakpoint as if nothing happened (and so we don't call | |
2760 | normal_stop). */ | |
2761 | static ULONGEST current_stop_id; | |
2762 | ||
2763 | /* See infrun.h. */ | |
2764 | ||
2765 | ULONGEST | |
2766 | get_stop_id (void) | |
2767 | { | |
2768 | return current_stop_id; | |
2769 | } | |
2770 | ||
2771 | /* Called when we report a user visible stop. */ | |
2772 | ||
2773 | static void | |
2774 | new_stop_id (void) | |
2775 | { | |
2776 | current_stop_id++; | |
2777 | } | |
2778 | ||
c906108c SS |
2779 | /* Clear out all variables saying what to do when inferior is continued. |
2780 | First do this, then set the ones you want, then call `proceed'. */ | |
2781 | ||
a7212384 UW |
2782 | static void |
2783 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2784 | { |
a7212384 UW |
2785 | if (debug_infrun) |
2786 | fprintf_unfiltered (gdb_stdlog, | |
2787 | "infrun: clear_proceed_status_thread (%s)\n", | |
2788 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 2789 | |
372316f1 PA |
2790 | /* If we're starting a new sequence, then the previous finished |
2791 | single-step is no longer relevant. */ | |
2792 | if (tp->suspend.waitstatus_pending_p) | |
2793 | { | |
2794 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2795 | { | |
2796 | if (debug_infrun) | |
2797 | fprintf_unfiltered (gdb_stdlog, | |
2798 | "infrun: clear_proceed_status: pending " | |
2799 | "event of %s was a finished step. " | |
2800 | "Discarding.\n", | |
2801 | target_pid_to_str (tp->ptid)); | |
2802 | ||
2803 | tp->suspend.waitstatus_pending_p = 0; | |
2804 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2805 | } | |
2806 | else if (debug_infrun) | |
2807 | { | |
2808 | char *statstr; | |
2809 | ||
2810 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
2811 | fprintf_unfiltered (gdb_stdlog, | |
2812 | "infrun: clear_proceed_status_thread: thread %s " | |
2813 | "has pending wait status %s " | |
2814 | "(currently_stepping=%d).\n", | |
2815 | target_pid_to_str (tp->ptid), statstr, | |
2816 | currently_stepping (tp)); | |
2817 | xfree (statstr); | |
2818 | } | |
2819 | } | |
2820 | ||
70509625 PA |
2821 | /* If this signal should not be seen by program, give it zero. |
2822 | Used for debugging signals. */ | |
2823 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2824 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2825 | ||
243a9253 PA |
2826 | thread_fsm_delete (tp->thread_fsm); |
2827 | tp->thread_fsm = NULL; | |
2828 | ||
16c381f0 JK |
2829 | tp->control.trap_expected = 0; |
2830 | tp->control.step_range_start = 0; | |
2831 | tp->control.step_range_end = 0; | |
c1e36e3e | 2832 | tp->control.may_range_step = 0; |
16c381f0 JK |
2833 | tp->control.step_frame_id = null_frame_id; |
2834 | tp->control.step_stack_frame_id = null_frame_id; | |
2835 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2836 | tp->control.step_start_function = NULL; |
a7212384 | 2837 | tp->stop_requested = 0; |
4e1c45ea | 2838 | |
16c381f0 | 2839 | tp->control.stop_step = 0; |
32400beb | 2840 | |
16c381f0 | 2841 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2842 | |
17b2616c | 2843 | tp->control.command_interp = NULL; |
856e7dd6 | 2844 | tp->control.stepping_command = 0; |
17b2616c | 2845 | |
a7212384 | 2846 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2847 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2848 | } |
32400beb | 2849 | |
a7212384 | 2850 | void |
70509625 | 2851 | clear_proceed_status (int step) |
a7212384 | 2852 | { |
f2665db5 MM |
2853 | /* With scheduler-locking replay, stop replaying other threads if we're |
2854 | not replaying the user-visible resume ptid. | |
2855 | ||
2856 | This is a convenience feature to not require the user to explicitly | |
2857 | stop replaying the other threads. We're assuming that the user's | |
2858 | intent is to resume tracing the recorded process. */ | |
2859 | if (!non_stop && scheduler_mode == schedlock_replay | |
2860 | && target_record_is_replaying (minus_one_ptid) | |
2861 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2862 | execution_direction)) | |
2863 | target_record_stop_replaying (); | |
2864 | ||
6c95b8df PA |
2865 | if (!non_stop) |
2866 | { | |
70509625 PA |
2867 | struct thread_info *tp; |
2868 | ptid_t resume_ptid; | |
2869 | ||
2870 | resume_ptid = user_visible_resume_ptid (step); | |
2871 | ||
2872 | /* In all-stop mode, delete the per-thread status of all threads | |
2873 | we're about to resume, implicitly and explicitly. */ | |
2874 | ALL_NON_EXITED_THREADS (tp) | |
2875 | { | |
2876 | if (!ptid_match (tp->ptid, resume_ptid)) | |
2877 | continue; | |
2878 | clear_proceed_status_thread (tp); | |
2879 | } | |
6c95b8df PA |
2880 | } |
2881 | ||
a7212384 UW |
2882 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2883 | { | |
2884 | struct inferior *inferior; | |
2885 | ||
2886 | if (non_stop) | |
2887 | { | |
6c95b8df PA |
2888 | /* If in non-stop mode, only delete the per-thread status of |
2889 | the current thread. */ | |
a7212384 UW |
2890 | clear_proceed_status_thread (inferior_thread ()); |
2891 | } | |
6c95b8df | 2892 | |
d6b48e9c | 2893 | inferior = current_inferior (); |
16c381f0 | 2894 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2895 | } |
2896 | ||
f3b1572e | 2897 | observer_notify_about_to_proceed (); |
c906108c SS |
2898 | } |
2899 | ||
99619bea PA |
2900 | /* Returns true if TP is still stopped at a breakpoint that needs |
2901 | stepping-over in order to make progress. If the breakpoint is gone | |
2902 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2903 | |
2904 | static int | |
6c4cfb24 | 2905 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2906 | { |
2907 | if (tp->stepping_over_breakpoint) | |
2908 | { | |
2909 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
2910 | ||
2911 | if (breakpoint_here_p (get_regcache_aspace (regcache), | |
af48d08f PA |
2912 | regcache_read_pc (regcache)) |
2913 | == ordinary_breakpoint_here) | |
99619bea PA |
2914 | return 1; |
2915 | ||
2916 | tp->stepping_over_breakpoint = 0; | |
2917 | } | |
2918 | ||
2919 | return 0; | |
2920 | } | |
2921 | ||
6c4cfb24 PA |
2922 | /* Check whether thread TP still needs to start a step-over in order |
2923 | to make progress when resumed. Returns an bitwise or of enum | |
2924 | step_over_what bits, indicating what needs to be stepped over. */ | |
2925 | ||
8d297bbf | 2926 | static step_over_what |
6c4cfb24 PA |
2927 | thread_still_needs_step_over (struct thread_info *tp) |
2928 | { | |
2929 | struct inferior *inf = find_inferior_ptid (tp->ptid); | |
8d297bbf | 2930 | step_over_what what = 0; |
6c4cfb24 PA |
2931 | |
2932 | if (thread_still_needs_step_over_bp (tp)) | |
2933 | what |= STEP_OVER_BREAKPOINT; | |
2934 | ||
2935 | if (tp->stepping_over_watchpoint | |
2936 | && !target_have_steppable_watchpoint) | |
2937 | what |= STEP_OVER_WATCHPOINT; | |
2938 | ||
2939 | return what; | |
2940 | } | |
2941 | ||
483805cf PA |
2942 | /* Returns true if scheduler locking applies. STEP indicates whether |
2943 | we're about to do a step/next-like command to a thread. */ | |
2944 | ||
2945 | static int | |
856e7dd6 | 2946 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2947 | { |
2948 | return (scheduler_mode == schedlock_on | |
2949 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2950 | && tp->control.stepping_command) |
2951 | || (scheduler_mode == schedlock_replay | |
2952 | && target_record_will_replay (minus_one_ptid, | |
2953 | execution_direction))); | |
483805cf PA |
2954 | } |
2955 | ||
c906108c SS |
2956 | /* Basic routine for continuing the program in various fashions. |
2957 | ||
2958 | ADDR is the address to resume at, or -1 for resume where stopped. | |
2959 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 2960 | or -1 for act according to how it stopped. |
c906108c | 2961 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
2962 | -1 means return after that and print nothing. |
2963 | You should probably set various step_... variables | |
2964 | before calling here, if you are stepping. | |
c906108c SS |
2965 | |
2966 | You should call clear_proceed_status before calling proceed. */ | |
2967 | ||
2968 | void | |
64ce06e4 | 2969 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2970 | { |
e58b0e63 PA |
2971 | struct regcache *regcache; |
2972 | struct gdbarch *gdbarch; | |
4e1c45ea | 2973 | struct thread_info *tp; |
e58b0e63 | 2974 | CORE_ADDR pc; |
6c95b8df | 2975 | struct address_space *aspace; |
4d9d9d04 PA |
2976 | ptid_t resume_ptid; |
2977 | struct execution_control_state ecss; | |
2978 | struct execution_control_state *ecs = &ecss; | |
2979 | struct cleanup *old_chain; | |
2980 | int started; | |
c906108c | 2981 | |
e58b0e63 PA |
2982 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2983 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2984 | resuming the current thread. */ | |
2985 | if (!follow_fork ()) | |
2986 | { | |
2987 | /* The target for some reason decided not to resume. */ | |
2988 | normal_stop (); | |
f148b27e PA |
2989 | if (target_can_async_p ()) |
2990 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2991 | return; |
2992 | } | |
2993 | ||
842951eb PA |
2994 | /* We'll update this if & when we switch to a new thread. */ |
2995 | previous_inferior_ptid = inferior_ptid; | |
2996 | ||
e58b0e63 PA |
2997 | regcache = get_current_regcache (); |
2998 | gdbarch = get_regcache_arch (regcache); | |
6c95b8df | 2999 | aspace = get_regcache_aspace (regcache); |
e58b0e63 | 3000 | pc = regcache_read_pc (regcache); |
2adfaa28 | 3001 | tp = inferior_thread (); |
e58b0e63 | 3002 | |
99619bea PA |
3003 | /* Fill in with reasonable starting values. */ |
3004 | init_thread_stepping_state (tp); | |
3005 | ||
c2829269 PA |
3006 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
3007 | ||
2acceee2 | 3008 | if (addr == (CORE_ADDR) -1) |
c906108c | 3009 | { |
af48d08f PA |
3010 | if (pc == stop_pc |
3011 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here | |
b2175913 | 3012 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
3013 | /* There is a breakpoint at the address we will resume at, |
3014 | step one instruction before inserting breakpoints so that | |
3015 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
3016 | breakpoint). |
3017 | ||
3018 | Note, we don't do this in reverse, because we won't | |
3019 | actually be executing the breakpoint insn anyway. | |
3020 | We'll be (un-)executing the previous instruction. */ | |
99619bea | 3021 | tp->stepping_over_breakpoint = 1; |
515630c5 UW |
3022 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3023 | && gdbarch_single_step_through_delay (gdbarch, | |
3024 | get_current_frame ())) | |
3352ef37 AC |
3025 | /* We stepped onto an instruction that needs to be stepped |
3026 | again before re-inserting the breakpoint, do so. */ | |
99619bea | 3027 | tp->stepping_over_breakpoint = 1; |
c906108c SS |
3028 | } |
3029 | else | |
3030 | { | |
515630c5 | 3031 | regcache_write_pc (regcache, addr); |
c906108c SS |
3032 | } |
3033 | ||
70509625 PA |
3034 | if (siggnal != GDB_SIGNAL_DEFAULT) |
3035 | tp->suspend.stop_signal = siggnal; | |
3036 | ||
17b2616c PA |
3037 | /* Record the interpreter that issued the execution command that |
3038 | caused this thread to resume. If the top level interpreter is | |
3039 | MI/async, and the execution command was a CLI command | |
3040 | (next/step/etc.), we'll want to print stop event output to the MI | |
3041 | console channel (the stepped-to line, etc.), as if the user | |
3042 | entered the execution command on a real GDB console. */ | |
4d9d9d04 PA |
3043 | tp->control.command_interp = command_interp (); |
3044 | ||
3045 | resume_ptid = user_visible_resume_ptid (tp->control.stepping_command); | |
3046 | ||
3047 | /* If an exception is thrown from this point on, make sure to | |
3048 | propagate GDB's knowledge of the executing state to the | |
3049 | frontend/user running state. */ | |
3050 | old_chain = make_cleanup (finish_thread_state_cleanup, &resume_ptid); | |
3051 | ||
3052 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3053 | threads (e.g., we might need to set threads stepping over | |
3054 | breakpoints first), from the user/frontend's point of view, all | |
3055 | threads in RESUME_PTID are now running. Unless we're calling an | |
3056 | inferior function, as in that case we pretend the inferior | |
3057 | doesn't run at all. */ | |
3058 | if (!tp->control.in_infcall) | |
3059 | set_running (resume_ptid, 1); | |
17b2616c | 3060 | |
527159b7 | 3061 | if (debug_infrun) |
8a9de0e4 | 3062 | fprintf_unfiltered (gdb_stdlog, |
64ce06e4 | 3063 | "infrun: proceed (addr=%s, signal=%s)\n", |
c9737c08 | 3064 | paddress (gdbarch, addr), |
64ce06e4 | 3065 | gdb_signal_to_symbol_string (siggnal)); |
527159b7 | 3066 | |
4d9d9d04 PA |
3067 | annotate_starting (); |
3068 | ||
3069 | /* Make sure that output from GDB appears before output from the | |
3070 | inferior. */ | |
3071 | gdb_flush (gdb_stdout); | |
3072 | ||
3073 | /* In a multi-threaded task we may select another thread and | |
3074 | then continue or step. | |
3075 | ||
3076 | But if a thread that we're resuming had stopped at a breakpoint, | |
3077 | it will immediately cause another breakpoint stop without any | |
3078 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3079 | we must step over it first. | |
3080 | ||
3081 | Look for threads other than the current (TP) that reported a | |
3082 | breakpoint hit and haven't been resumed yet since. */ | |
3083 | ||
3084 | /* If scheduler locking applies, we can avoid iterating over all | |
3085 | threads. */ | |
3086 | if (!non_stop && !schedlock_applies (tp)) | |
94cc34af | 3087 | { |
4d9d9d04 PA |
3088 | struct thread_info *current = tp; |
3089 | ||
3090 | ALL_NON_EXITED_THREADS (tp) | |
3091 | { | |
3092 | /* Ignore the current thread here. It's handled | |
3093 | afterwards. */ | |
3094 | if (tp == current) | |
3095 | continue; | |
99619bea | 3096 | |
4d9d9d04 PA |
3097 | /* Ignore threads of processes we're not resuming. */ |
3098 | if (!ptid_match (tp->ptid, resume_ptid)) | |
3099 | continue; | |
c906108c | 3100 | |
4d9d9d04 PA |
3101 | if (!thread_still_needs_step_over (tp)) |
3102 | continue; | |
3103 | ||
3104 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3105 | |
99619bea PA |
3106 | if (debug_infrun) |
3107 | fprintf_unfiltered (gdb_stdlog, | |
3108 | "infrun: need to step-over [%s] first\n", | |
4d9d9d04 | 3109 | target_pid_to_str (tp->ptid)); |
99619bea | 3110 | |
4d9d9d04 | 3111 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3112 | } |
31e77af2 | 3113 | |
4d9d9d04 | 3114 | tp = current; |
30852783 UW |
3115 | } |
3116 | ||
4d9d9d04 PA |
3117 | /* Enqueue the current thread last, so that we move all other |
3118 | threads over their breakpoints first. */ | |
3119 | if (tp->stepping_over_breakpoint) | |
3120 | thread_step_over_chain_enqueue (tp); | |
30852783 | 3121 | |
4d9d9d04 PA |
3122 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3123 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3124 | advanced. Must do this before resuming any thread, as in | |
3125 | all-stop/remote, once we resume we can't send any other packet | |
3126 | until the target stops again. */ | |
3127 | tp->prev_pc = regcache_read_pc (regcache); | |
99619bea | 3128 | |
4d9d9d04 | 3129 | started = start_step_over (); |
c906108c | 3130 | |
4d9d9d04 PA |
3131 | if (step_over_info_valid_p ()) |
3132 | { | |
3133 | /* Either this thread started a new in-line step over, or some | |
3134 | other thread was already doing one. In either case, don't | |
3135 | resume anything else until the step-over is finished. */ | |
3136 | } | |
fbea99ea | 3137 | else if (started && !target_is_non_stop_p ()) |
4d9d9d04 PA |
3138 | { |
3139 | /* A new displaced stepping sequence was started. In all-stop, | |
3140 | we can't talk to the target anymore until it next stops. */ | |
3141 | } | |
fbea99ea PA |
3142 | else if (!non_stop && target_is_non_stop_p ()) |
3143 | { | |
3144 | /* In all-stop, but the target is always in non-stop mode. | |
3145 | Start all other threads that are implicitly resumed too. */ | |
3146 | ALL_NON_EXITED_THREADS (tp) | |
3147 | { | |
3148 | /* Ignore threads of processes we're not resuming. */ | |
3149 | if (!ptid_match (tp->ptid, resume_ptid)) | |
3150 | continue; | |
3151 | ||
3152 | if (tp->resumed) | |
3153 | { | |
3154 | if (debug_infrun) | |
3155 | fprintf_unfiltered (gdb_stdlog, | |
3156 | "infrun: proceed: [%s] resumed\n", | |
3157 | target_pid_to_str (tp->ptid)); | |
3158 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
3159 | continue; | |
3160 | } | |
3161 | ||
3162 | if (thread_is_in_step_over_chain (tp)) | |
3163 | { | |
3164 | if (debug_infrun) | |
3165 | fprintf_unfiltered (gdb_stdlog, | |
3166 | "infrun: proceed: [%s] needs step-over\n", | |
3167 | target_pid_to_str (tp->ptid)); | |
3168 | continue; | |
3169 | } | |
3170 | ||
3171 | if (debug_infrun) | |
3172 | fprintf_unfiltered (gdb_stdlog, | |
3173 | "infrun: proceed: resuming %s\n", | |
3174 | target_pid_to_str (tp->ptid)); | |
3175 | ||
3176 | reset_ecs (ecs, tp); | |
3177 | switch_to_thread (tp->ptid); | |
3178 | keep_going_pass_signal (ecs); | |
3179 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3180 | error (_("Command aborted.")); |
fbea99ea PA |
3181 | } |
3182 | } | |
372316f1 | 3183 | else if (!tp->resumed && !thread_is_in_step_over_chain (tp)) |
4d9d9d04 PA |
3184 | { |
3185 | /* The thread wasn't started, and isn't queued, run it now. */ | |
3186 | reset_ecs (ecs, tp); | |
3187 | switch_to_thread (tp->ptid); | |
3188 | keep_going_pass_signal (ecs); | |
3189 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3190 | error (_("Command aborted.")); |
4d9d9d04 | 3191 | } |
c906108c | 3192 | |
4d9d9d04 | 3193 | discard_cleanups (old_chain); |
c906108c | 3194 | |
0b333c5e PA |
3195 | /* Tell the event loop to wait for it to stop. If the target |
3196 | supports asynchronous execution, it'll do this from within | |
3197 | target_resume. */ | |
362646f5 | 3198 | if (!target_can_async_p ()) |
0b333c5e | 3199 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3200 | } |
c906108c SS |
3201 | \f |
3202 | ||
3203 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3204 | |
c906108c | 3205 | void |
8621d6a9 | 3206 | start_remote (int from_tty) |
c906108c | 3207 | { |
d6b48e9c | 3208 | struct inferior *inferior; |
d6b48e9c PA |
3209 | |
3210 | inferior = current_inferior (); | |
16c381f0 | 3211 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; |
43ff13b4 | 3212 | |
1777feb0 | 3213 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3214 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3215 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3216 | nothing is returned (instead of just blocking). Because of this, |
3217 | targets expecting an immediate response need to, internally, set | |
3218 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3219 | timeout. */ |
6426a772 JM |
3220 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3221 | differentiate to its caller what the state of the target is after | |
3222 | the initial open has been performed. Here we're assuming that | |
3223 | the target has stopped. It should be possible to eventually have | |
3224 | target_open() return to the caller an indication that the target | |
3225 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3226 | for an async run. */ |
e4c8541f | 3227 | wait_for_inferior (); |
8621d6a9 DJ |
3228 | |
3229 | /* Now that the inferior has stopped, do any bookkeeping like | |
3230 | loading shared libraries. We want to do this before normal_stop, | |
3231 | so that the displayed frame is up to date. */ | |
3232 | post_create_inferior (¤t_target, from_tty); | |
3233 | ||
6426a772 | 3234 | normal_stop (); |
c906108c SS |
3235 | } |
3236 | ||
3237 | /* Initialize static vars when a new inferior begins. */ | |
3238 | ||
3239 | void | |
96baa820 | 3240 | init_wait_for_inferior (void) |
c906108c SS |
3241 | { |
3242 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3243 | |
c906108c SS |
3244 | breakpoint_init_inferior (inf_starting); |
3245 | ||
70509625 | 3246 | clear_proceed_status (0); |
9f976b41 | 3247 | |
ca005067 | 3248 | target_last_wait_ptid = minus_one_ptid; |
237fc4c9 | 3249 | |
842951eb | 3250 | previous_inferior_ptid = inferior_ptid; |
0d1e5fa7 | 3251 | |
edb3359d DJ |
3252 | /* Discard any skipped inlined frames. */ |
3253 | clear_inline_frame_state (minus_one_ptid); | |
c906108c | 3254 | } |
237fc4c9 | 3255 | |
c906108c | 3256 | \f |
488f131b | 3257 | |
ec9499be | 3258 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3259 | |
568d6575 UW |
3260 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3261 | struct execution_control_state *ecs); | |
3262 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3263 | struct execution_control_state *ecs); | |
4f5d7f63 | 3264 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3265 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3266 | struct frame_info *); |
611c83ae | 3267 | |
bdc36728 | 3268 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3269 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3270 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3271 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3272 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3273 | |
252fbfc8 PA |
3274 | /* Callback for iterate over threads. If the thread is stopped, but |
3275 | the user/frontend doesn't know about that yet, go through | |
3276 | normal_stop, as if the thread had just stopped now. ARG points at | |
3277 | a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If | |
3278 | ptid_is_pid(PTID) is true, applies to all threads of the process | |
3279 | pointed at by PTID. Otherwise, apply only to the thread pointed by | |
3280 | PTID. */ | |
3281 | ||
3282 | static int | |
3283 | infrun_thread_stop_requested_callback (struct thread_info *info, void *arg) | |
3284 | { | |
3285 | ptid_t ptid = * (ptid_t *) arg; | |
3286 | ||
3287 | if ((ptid_equal (info->ptid, ptid) | |
3288 | || ptid_equal (minus_one_ptid, ptid) | |
3289 | || (ptid_is_pid (ptid) | |
3290 | && ptid_get_pid (ptid) == ptid_get_pid (info->ptid))) | |
3291 | && is_running (info->ptid) | |
3292 | && !is_executing (info->ptid)) | |
3293 | { | |
3294 | struct cleanup *old_chain; | |
3295 | struct execution_control_state ecss; | |
3296 | struct execution_control_state *ecs = &ecss; | |
3297 | ||
3298 | memset (ecs, 0, sizeof (*ecs)); | |
3299 | ||
3300 | old_chain = make_cleanup_restore_current_thread (); | |
3301 | ||
f15cb84a YQ |
3302 | overlay_cache_invalid = 1; |
3303 | /* Flush target cache before starting to handle each event. | |
3304 | Target was running and cache could be stale. This is just a | |
3305 | heuristic. Running threads may modify target memory, but we | |
3306 | don't get any event. */ | |
3307 | target_dcache_invalidate (); | |
3308 | ||
252fbfc8 PA |
3309 | /* Go through handle_inferior_event/normal_stop, so we always |
3310 | have consistent output as if the stop event had been | |
3311 | reported. */ | |
3312 | ecs->ptid = info->ptid; | |
243a9253 | 3313 | ecs->event_thread = info; |
252fbfc8 | 3314 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; |
a493e3e2 | 3315 | ecs->ws.value.sig = GDB_SIGNAL_0; |
252fbfc8 PA |
3316 | |
3317 | handle_inferior_event (ecs); | |
3318 | ||
3319 | if (!ecs->wait_some_more) | |
3320 | { | |
243a9253 PA |
3321 | /* Cancel any running execution command. */ |
3322 | thread_cancel_execution_command (info); | |
3323 | ||
252fbfc8 | 3324 | normal_stop (); |
252fbfc8 PA |
3325 | } |
3326 | ||
3327 | do_cleanups (old_chain); | |
3328 | } | |
3329 | ||
3330 | return 0; | |
3331 | } | |
3332 | ||
3333 | /* This function is attached as a "thread_stop_requested" observer. | |
3334 | Cleanup local state that assumed the PTID was to be resumed, and | |
3335 | report the stop to the frontend. */ | |
3336 | ||
2c0b251b | 3337 | static void |
252fbfc8 PA |
3338 | infrun_thread_stop_requested (ptid_t ptid) |
3339 | { | |
c2829269 | 3340 | struct thread_info *tp; |
252fbfc8 | 3341 | |
c2829269 PA |
3342 | /* PTID was requested to stop. Remove matching threads from the |
3343 | step-over queue, so we don't try to resume them | |
3344 | automatically. */ | |
3345 | ALL_NON_EXITED_THREADS (tp) | |
3346 | if (ptid_match (tp->ptid, ptid)) | |
3347 | { | |
3348 | if (thread_is_in_step_over_chain (tp)) | |
3349 | thread_step_over_chain_remove (tp); | |
3350 | } | |
252fbfc8 PA |
3351 | |
3352 | iterate_over_threads (infrun_thread_stop_requested_callback, &ptid); | |
3353 | } | |
3354 | ||
a07daef3 PA |
3355 | static void |
3356 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3357 | { | |
3358 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
3359 | nullify_last_target_wait_ptid (); | |
3360 | } | |
3361 | ||
0cbcdb96 PA |
3362 | /* Delete the step resume, single-step and longjmp/exception resume |
3363 | breakpoints of TP. */ | |
4e1c45ea | 3364 | |
0cbcdb96 PA |
3365 | static void |
3366 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3367 | { |
0cbcdb96 PA |
3368 | delete_step_resume_breakpoint (tp); |
3369 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3370 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3371 | } |
3372 | ||
0cbcdb96 PA |
3373 | /* If the target still has execution, call FUNC for each thread that |
3374 | just stopped. In all-stop, that's all the non-exited threads; in | |
3375 | non-stop, that's the current thread, only. */ | |
3376 | ||
3377 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3378 | (struct thread_info *tp); | |
4e1c45ea PA |
3379 | |
3380 | static void | |
0cbcdb96 | 3381 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3382 | { |
0cbcdb96 | 3383 | if (!target_has_execution || ptid_equal (inferior_ptid, null_ptid)) |
4e1c45ea PA |
3384 | return; |
3385 | ||
fbea99ea | 3386 | if (target_is_non_stop_p ()) |
4e1c45ea | 3387 | { |
0cbcdb96 PA |
3388 | /* If in non-stop mode, only the current thread stopped. */ |
3389 | func (inferior_thread ()); | |
4e1c45ea PA |
3390 | } |
3391 | else | |
0cbcdb96 PA |
3392 | { |
3393 | struct thread_info *tp; | |
3394 | ||
3395 | /* In all-stop mode, all threads have stopped. */ | |
3396 | ALL_NON_EXITED_THREADS (tp) | |
3397 | { | |
3398 | func (tp); | |
3399 | } | |
3400 | } | |
3401 | } | |
3402 | ||
3403 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3404 | the threads that just stopped. */ | |
3405 | ||
3406 | static void | |
3407 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3408 | { | |
3409 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3410 | } |
3411 | ||
3412 | /* Delete the single-step breakpoints of the threads that just | |
3413 | stopped. */ | |
7c16b83e | 3414 | |
34b7e8a6 PA |
3415 | static void |
3416 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3417 | { | |
3418 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3419 | } |
3420 | ||
1777feb0 | 3421 | /* A cleanup wrapper. */ |
4e1c45ea PA |
3422 | |
3423 | static void | |
0cbcdb96 | 3424 | delete_just_stopped_threads_infrun_breakpoints_cleanup (void *arg) |
4e1c45ea | 3425 | { |
0cbcdb96 | 3426 | delete_just_stopped_threads_infrun_breakpoints (); |
4e1c45ea PA |
3427 | } |
3428 | ||
221e1a37 | 3429 | /* See infrun.h. */ |
223698f8 | 3430 | |
221e1a37 | 3431 | void |
223698f8 DE |
3432 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3433 | const struct target_waitstatus *ws) | |
3434 | { | |
3435 | char *status_string = target_waitstatus_to_string (ws); | |
3436 | struct ui_file *tmp_stream = mem_fileopen (); | |
3437 | char *text; | |
223698f8 DE |
3438 | |
3439 | /* The text is split over several lines because it was getting too long. | |
3440 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3441 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3442 | is set. */ | |
3443 | ||
3444 | fprintf_unfiltered (tmp_stream, | |
1176ecec PA |
3445 | "infrun: target_wait (%d.%ld.%ld", |
3446 | ptid_get_pid (waiton_ptid), | |
3447 | ptid_get_lwp (waiton_ptid), | |
3448 | ptid_get_tid (waiton_ptid)); | |
dfd4cc63 | 3449 | if (ptid_get_pid (waiton_ptid) != -1) |
223698f8 DE |
3450 | fprintf_unfiltered (tmp_stream, |
3451 | " [%s]", target_pid_to_str (waiton_ptid)); | |
3452 | fprintf_unfiltered (tmp_stream, ", status) =\n"); | |
3453 | fprintf_unfiltered (tmp_stream, | |
1176ecec | 3454 | "infrun: %d.%ld.%ld [%s],\n", |
dfd4cc63 | 3455 | ptid_get_pid (result_ptid), |
1176ecec PA |
3456 | ptid_get_lwp (result_ptid), |
3457 | ptid_get_tid (result_ptid), | |
dfd4cc63 | 3458 | target_pid_to_str (result_ptid)); |
223698f8 DE |
3459 | fprintf_unfiltered (tmp_stream, |
3460 | "infrun: %s\n", | |
3461 | status_string); | |
3462 | ||
759ef836 | 3463 | text = ui_file_xstrdup (tmp_stream, NULL); |
223698f8 DE |
3464 | |
3465 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3466 | a gcc error: the format attribute requires a string literal. */ | |
3467 | fprintf_unfiltered (gdb_stdlog, "%s", text); | |
3468 | ||
3469 | xfree (status_string); | |
3470 | xfree (text); | |
3471 | ui_file_delete (tmp_stream); | |
3472 | } | |
3473 | ||
372316f1 PA |
3474 | /* Select a thread at random, out of those which are resumed and have |
3475 | had events. */ | |
3476 | ||
3477 | static struct thread_info * | |
3478 | random_pending_event_thread (ptid_t waiton_ptid) | |
3479 | { | |
3480 | struct thread_info *event_tp; | |
3481 | int num_events = 0; | |
3482 | int random_selector; | |
3483 | ||
3484 | /* First see how many events we have. Count only resumed threads | |
3485 | that have an event pending. */ | |
3486 | ALL_NON_EXITED_THREADS (event_tp) | |
3487 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3488 | && event_tp->resumed | |
3489 | && event_tp->suspend.waitstatus_pending_p) | |
3490 | num_events++; | |
3491 | ||
3492 | if (num_events == 0) | |
3493 | return NULL; | |
3494 | ||
3495 | /* Now randomly pick a thread out of those that have had events. */ | |
3496 | random_selector = (int) | |
3497 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
3498 | ||
3499 | if (debug_infrun && num_events > 1) | |
3500 | fprintf_unfiltered (gdb_stdlog, | |
3501 | "infrun: Found %d events, selecting #%d\n", | |
3502 | num_events, random_selector); | |
3503 | ||
3504 | /* Select the Nth thread that has had an event. */ | |
3505 | ALL_NON_EXITED_THREADS (event_tp) | |
3506 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3507 | && event_tp->resumed | |
3508 | && event_tp->suspend.waitstatus_pending_p) | |
3509 | if (random_selector-- == 0) | |
3510 | break; | |
3511 | ||
3512 | return event_tp; | |
3513 | } | |
3514 | ||
3515 | /* Wrapper for target_wait that first checks whether threads have | |
3516 | pending statuses to report before actually asking the target for | |
3517 | more events. */ | |
3518 | ||
3519 | static ptid_t | |
3520 | do_target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
3521 | { | |
3522 | ptid_t event_ptid; | |
3523 | struct thread_info *tp; | |
3524 | ||
3525 | /* First check if there is a resumed thread with a wait status | |
3526 | pending. */ | |
3527 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) | |
3528 | { | |
3529 | tp = random_pending_event_thread (ptid); | |
3530 | } | |
3531 | else | |
3532 | { | |
3533 | if (debug_infrun) | |
3534 | fprintf_unfiltered (gdb_stdlog, | |
3535 | "infrun: Waiting for specific thread %s.\n", | |
3536 | target_pid_to_str (ptid)); | |
3537 | ||
3538 | /* We have a specific thread to check. */ | |
3539 | tp = find_thread_ptid (ptid); | |
3540 | gdb_assert (tp != NULL); | |
3541 | if (!tp->suspend.waitstatus_pending_p) | |
3542 | tp = NULL; | |
3543 | } | |
3544 | ||
3545 | if (tp != NULL | |
3546 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3547 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3548 | { | |
3549 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
3550 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3551 | CORE_ADDR pc; | |
3552 | int discard = 0; | |
3553 | ||
3554 | pc = regcache_read_pc (regcache); | |
3555 | ||
3556 | if (pc != tp->suspend.stop_pc) | |
3557 | { | |
3558 | if (debug_infrun) | |
3559 | fprintf_unfiltered (gdb_stdlog, | |
3560 | "infrun: PC of %s changed. was=%s, now=%s\n", | |
3561 | target_pid_to_str (tp->ptid), | |
3562 | paddress (gdbarch, tp->prev_pc), | |
3563 | paddress (gdbarch, pc)); | |
3564 | discard = 1; | |
3565 | } | |
3566 | else if (!breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3567 | { | |
3568 | if (debug_infrun) | |
3569 | fprintf_unfiltered (gdb_stdlog, | |
3570 | "infrun: previous breakpoint of %s, at %s gone\n", | |
3571 | target_pid_to_str (tp->ptid), | |
3572 | paddress (gdbarch, pc)); | |
3573 | ||
3574 | discard = 1; | |
3575 | } | |
3576 | ||
3577 | if (discard) | |
3578 | { | |
3579 | if (debug_infrun) | |
3580 | fprintf_unfiltered (gdb_stdlog, | |
3581 | "infrun: pending event of %s cancelled.\n", | |
3582 | target_pid_to_str (tp->ptid)); | |
3583 | ||
3584 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3585 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3586 | } | |
3587 | } | |
3588 | ||
3589 | if (tp != NULL) | |
3590 | { | |
3591 | if (debug_infrun) | |
3592 | { | |
3593 | char *statstr; | |
3594 | ||
3595 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
3596 | fprintf_unfiltered (gdb_stdlog, | |
3597 | "infrun: Using pending wait status %s for %s.\n", | |
3598 | statstr, | |
3599 | target_pid_to_str (tp->ptid)); | |
3600 | xfree (statstr); | |
3601 | } | |
3602 | ||
3603 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3604 | if it was a software breakpoint (and the target doesn't | |
3605 | always adjust the PC itself). */ | |
3606 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3607 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3608 | { | |
3609 | struct regcache *regcache; | |
3610 | struct gdbarch *gdbarch; | |
3611 | int decr_pc; | |
3612 | ||
3613 | regcache = get_thread_regcache (tp->ptid); | |
3614 | gdbarch = get_regcache_arch (regcache); | |
3615 | ||
3616 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3617 | if (decr_pc != 0) | |
3618 | { | |
3619 | CORE_ADDR pc; | |
3620 | ||
3621 | pc = regcache_read_pc (regcache); | |
3622 | regcache_write_pc (regcache, pc + decr_pc); | |
3623 | } | |
3624 | } | |
3625 | ||
3626 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3627 | *status = tp->suspend.waitstatus; | |
3628 | tp->suspend.waitstatus_pending_p = 0; | |
3629 | ||
3630 | /* Wake up the event loop again, until all pending events are | |
3631 | processed. */ | |
3632 | if (target_is_async_p ()) | |
3633 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3634 | return tp->ptid; | |
3635 | } | |
3636 | ||
3637 | /* But if we don't find one, we'll have to wait. */ | |
3638 | ||
3639 | if (deprecated_target_wait_hook) | |
3640 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3641 | else | |
3642 | event_ptid = target_wait (ptid, status, options); | |
3643 | ||
3644 | return event_ptid; | |
3645 | } | |
3646 | ||
24291992 PA |
3647 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3648 | detaching while a thread is displaced stepping is a recipe for | |
3649 | crashing it, as nothing would readjust the PC out of the scratch | |
3650 | pad. */ | |
3651 | ||
3652 | void | |
3653 | prepare_for_detach (void) | |
3654 | { | |
3655 | struct inferior *inf = current_inferior (); | |
3656 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
3657 | struct cleanup *old_chain_1; | |
3658 | struct displaced_step_inferior_state *displaced; | |
3659 | ||
3660 | displaced = get_displaced_stepping_state (inf->pid); | |
3661 | ||
3662 | /* Is any thread of this process displaced stepping? If not, | |
3663 | there's nothing else to do. */ | |
3664 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
3665 | return; | |
3666 | ||
3667 | if (debug_infrun) | |
3668 | fprintf_unfiltered (gdb_stdlog, | |
3669 | "displaced-stepping in-process while detaching"); | |
3670 | ||
3671 | old_chain_1 = make_cleanup_restore_integer (&inf->detaching); | |
3672 | inf->detaching = 1; | |
3673 | ||
3674 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
3675 | { | |
3676 | struct cleanup *old_chain_2; | |
3677 | struct execution_control_state ecss; | |
3678 | struct execution_control_state *ecs; | |
3679 | ||
3680 | ecs = &ecss; | |
3681 | memset (ecs, 0, sizeof (*ecs)); | |
3682 | ||
3683 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3684 | /* Flush target cache before starting to handle each event. |
3685 | Target was running and cache could be stale. This is just a | |
3686 | heuristic. Running threads may modify target memory, but we | |
3687 | don't get any event. */ | |
3688 | target_dcache_invalidate (); | |
24291992 | 3689 | |
372316f1 | 3690 | ecs->ptid = do_target_wait (pid_ptid, &ecs->ws, 0); |
24291992 PA |
3691 | |
3692 | if (debug_infrun) | |
3693 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3694 | ||
3695 | /* If an error happens while handling the event, propagate GDB's | |
3696 | knowledge of the executing state to the frontend/user running | |
3697 | state. */ | |
3e43a32a MS |
3698 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, |
3699 | &minus_one_ptid); | |
24291992 PA |
3700 | |
3701 | /* Now figure out what to do with the result of the result. */ | |
3702 | handle_inferior_event (ecs); | |
3703 | ||
3704 | /* No error, don't finish the state yet. */ | |
3705 | discard_cleanups (old_chain_2); | |
3706 | ||
3707 | /* Breakpoints and watchpoints are not installed on the target | |
3708 | at this point, and signals are passed directly to the | |
3709 | inferior, so this must mean the process is gone. */ | |
3710 | if (!ecs->wait_some_more) | |
3711 | { | |
3712 | discard_cleanups (old_chain_1); | |
3713 | error (_("Program exited while detaching")); | |
3714 | } | |
3715 | } | |
3716 | ||
3717 | discard_cleanups (old_chain_1); | |
3718 | } | |
3719 | ||
cd0fc7c3 | 3720 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3721 | |
cd0fc7c3 SS |
3722 | If inferior gets a signal, we may decide to start it up again |
3723 | instead of returning. That is why there is a loop in this function. | |
3724 | When this function actually returns it means the inferior | |
3725 | should be left stopped and GDB should read more commands. */ | |
3726 | ||
3727 | void | |
e4c8541f | 3728 | wait_for_inferior (void) |
cd0fc7c3 SS |
3729 | { |
3730 | struct cleanup *old_cleanups; | |
e6f5c25b | 3731 | struct cleanup *thread_state_chain; |
c906108c | 3732 | |
527159b7 | 3733 | if (debug_infrun) |
ae123ec6 | 3734 | fprintf_unfiltered |
e4c8541f | 3735 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3736 | |
0cbcdb96 PA |
3737 | old_cleanups |
3738 | = make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, | |
3739 | NULL); | |
cd0fc7c3 | 3740 | |
e6f5c25b PA |
3741 | /* If an error happens while handling the event, propagate GDB's |
3742 | knowledge of the executing state to the frontend/user running | |
3743 | state. */ | |
3744 | thread_state_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
3745 | ||
c906108c SS |
3746 | while (1) |
3747 | { | |
ae25568b PA |
3748 | struct execution_control_state ecss; |
3749 | struct execution_control_state *ecs = &ecss; | |
963f9c80 | 3750 | ptid_t waiton_ptid = minus_one_ptid; |
29f49a6a | 3751 | |
ae25568b PA |
3752 | memset (ecs, 0, sizeof (*ecs)); |
3753 | ||
ec9499be | 3754 | overlay_cache_invalid = 1; |
ec9499be | 3755 | |
f15cb84a YQ |
3756 | /* Flush target cache before starting to handle each event. |
3757 | Target was running and cache could be stale. This is just a | |
3758 | heuristic. Running threads may modify target memory, but we | |
3759 | don't get any event. */ | |
3760 | target_dcache_invalidate (); | |
3761 | ||
372316f1 | 3762 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 3763 | |
f00150c9 | 3764 | if (debug_infrun) |
223698f8 | 3765 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3766 | |
cd0fc7c3 SS |
3767 | /* Now figure out what to do with the result of the result. */ |
3768 | handle_inferior_event (ecs); | |
c906108c | 3769 | |
cd0fc7c3 SS |
3770 | if (!ecs->wait_some_more) |
3771 | break; | |
3772 | } | |
4e1c45ea | 3773 | |
e6f5c25b PA |
3774 | /* No error, don't finish the state yet. */ |
3775 | discard_cleanups (thread_state_chain); | |
3776 | ||
cd0fc7c3 SS |
3777 | do_cleanups (old_cleanups); |
3778 | } | |
c906108c | 3779 | |
d3d4baed PA |
3780 | /* Cleanup that reinstalls the readline callback handler, if the |
3781 | target is running in the background. If while handling the target | |
3782 | event something triggered a secondary prompt, like e.g., a | |
3783 | pagination prompt, we'll have removed the callback handler (see | |
3784 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3785 | event loop, ready to process further input. Note this has no | |
3786 | effect if the handler hasn't actually been removed, because calling | |
3787 | rl_callback_handler_install resets the line buffer, thus losing | |
3788 | input. */ | |
3789 | ||
3790 | static void | |
3791 | reinstall_readline_callback_handler_cleanup (void *arg) | |
3792 | { | |
6c400b59 PA |
3793 | if (!interpreter_async) |
3794 | { | |
3795 | /* We're not going back to the top level event loop yet. Don't | |
3796 | install the readline callback, as it'd prep the terminal, | |
3797 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3798 | it the next time the prompt is displayed, when we're ready | |
3799 | for input. */ | |
3800 | return; | |
3801 | } | |
3802 | ||
d3d4baed PA |
3803 | if (async_command_editing_p && !sync_execution) |
3804 | gdb_rl_callback_handler_reinstall (); | |
3805 | } | |
3806 | ||
243a9253 PA |
3807 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3808 | that's just the event thread. In all-stop, that's all threads. */ | |
3809 | ||
3810 | static void | |
3811 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3812 | { | |
3813 | struct thread_info *thr = ecs->event_thread; | |
3814 | ||
3815 | if (thr != NULL && thr->thread_fsm != NULL) | |
3816 | thread_fsm_clean_up (thr->thread_fsm); | |
3817 | ||
3818 | if (!non_stop) | |
3819 | { | |
3820 | ALL_NON_EXITED_THREADS (thr) | |
3821 | { | |
3822 | if (thr->thread_fsm == NULL) | |
3823 | continue; | |
3824 | if (thr == ecs->event_thread) | |
3825 | continue; | |
3826 | ||
3827 | switch_to_thread (thr->ptid); | |
3828 | thread_fsm_clean_up (thr->thread_fsm); | |
3829 | } | |
3830 | ||
3831 | if (ecs->event_thread != NULL) | |
3832 | switch_to_thread (ecs->event_thread->ptid); | |
3833 | } | |
3834 | } | |
3835 | ||
170742de PA |
3836 | /* A cleanup that restores the execution direction to the value saved |
3837 | in *ARG. */ | |
3838 | ||
3839 | static void | |
3840 | restore_execution_direction (void *arg) | |
3841 | { | |
3842 | enum exec_direction_kind *save_exec_dir = (enum exec_direction_kind *) arg; | |
3843 | ||
3844 | execution_direction = *save_exec_dir; | |
3845 | } | |
3846 | ||
1777feb0 | 3847 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3848 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3849 | descriptor corresponding to the target. It can be called more than |
3850 | once to complete a single execution command. In such cases we need | |
3851 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3852 | that this function is called for a single execution command, then |
3853 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3854 | necessary cleanups. */ |
43ff13b4 JM |
3855 | |
3856 | void | |
fba45db2 | 3857 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3858 | { |
0d1e5fa7 | 3859 | struct execution_control_state ecss; |
a474d7c2 | 3860 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 3861 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 3862 | struct cleanup *ts_old_chain; |
4f8d22e3 | 3863 | int was_sync = sync_execution; |
170742de | 3864 | enum exec_direction_kind save_exec_dir = execution_direction; |
0f641c01 | 3865 | int cmd_done = 0; |
963f9c80 | 3866 | ptid_t waiton_ptid = minus_one_ptid; |
43ff13b4 | 3867 | |
0d1e5fa7 PA |
3868 | memset (ecs, 0, sizeof (*ecs)); |
3869 | ||
d3d4baed PA |
3870 | /* End up with readline processing input, if necessary. */ |
3871 | make_cleanup (reinstall_readline_callback_handler_cleanup, NULL); | |
3872 | ||
c5187ac6 PA |
3873 | /* We're handling a live event, so make sure we're doing live |
3874 | debugging. If we're looking at traceframes while the target is | |
3875 | running, we're going to need to get back to that mode after | |
3876 | handling the event. */ | |
3877 | if (non_stop) | |
3878 | { | |
3879 | make_cleanup_restore_current_traceframe (); | |
e6e4e701 | 3880 | set_current_traceframe (-1); |
c5187ac6 PA |
3881 | } |
3882 | ||
4f8d22e3 PA |
3883 | if (non_stop) |
3884 | /* In non-stop mode, the user/frontend should not notice a thread | |
3885 | switch due to internal events. Make sure we reverse to the | |
3886 | user selected thread and frame after handling the event and | |
3887 | running any breakpoint commands. */ | |
3888 | make_cleanup_restore_current_thread (); | |
3889 | ||
ec9499be | 3890 | overlay_cache_invalid = 1; |
f15cb84a YQ |
3891 | /* Flush target cache before starting to handle each event. Target |
3892 | was running and cache could be stale. This is just a heuristic. | |
3893 | Running threads may modify target memory, but we don't get any | |
3894 | event. */ | |
3895 | target_dcache_invalidate (); | |
3dd5b83d | 3896 | |
170742de | 3897 | make_cleanup (restore_execution_direction, &save_exec_dir); |
32231432 PA |
3898 | execution_direction = target_execution_direction (); |
3899 | ||
0b333c5e PA |
3900 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, |
3901 | target_can_async_p () ? TARGET_WNOHANG : 0); | |
43ff13b4 | 3902 | |
f00150c9 | 3903 | if (debug_infrun) |
223698f8 | 3904 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3905 | |
29f49a6a PA |
3906 | /* If an error happens while handling the event, propagate GDB's |
3907 | knowledge of the executing state to the frontend/user running | |
3908 | state. */ | |
fbea99ea | 3909 | if (!target_is_non_stop_p ()) |
29f49a6a PA |
3910 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); |
3911 | else | |
3912 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
3913 | ||
353d1d73 JK |
3914 | /* Get executed before make_cleanup_restore_current_thread above to apply |
3915 | still for the thread which has thrown the exception. */ | |
3916 | make_bpstat_clear_actions_cleanup (); | |
3917 | ||
7c16b83e PA |
3918 | make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, NULL); |
3919 | ||
43ff13b4 | 3920 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 3921 | handle_inferior_event (ecs); |
43ff13b4 | 3922 | |
a474d7c2 | 3923 | if (!ecs->wait_some_more) |
43ff13b4 | 3924 | { |
c9657e70 | 3925 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
243a9253 PA |
3926 | int should_stop = 1; |
3927 | struct thread_info *thr = ecs->event_thread; | |
388a7084 | 3928 | int should_notify_stop = 1; |
d6b48e9c | 3929 | |
0cbcdb96 | 3930 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3931 | |
243a9253 PA |
3932 | if (thr != NULL) |
3933 | { | |
3934 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
3935 | ||
3936 | if (thread_fsm != NULL) | |
3937 | should_stop = thread_fsm_should_stop (thread_fsm); | |
3938 | } | |
3939 | ||
3940 | if (!should_stop) | |
3941 | { | |
3942 | keep_going (ecs); | |
3943 | } | |
c2d11a7d | 3944 | else |
0f641c01 | 3945 | { |
243a9253 PA |
3946 | clean_up_just_stopped_threads_fsms (ecs); |
3947 | ||
388a7084 PA |
3948 | if (thr != NULL && thr->thread_fsm != NULL) |
3949 | { | |
3950 | should_notify_stop | |
3951 | = thread_fsm_should_notify_stop (thr->thread_fsm); | |
3952 | } | |
3953 | ||
3954 | if (should_notify_stop) | |
3955 | { | |
4c2f2a79 PA |
3956 | int proceeded = 0; |
3957 | ||
388a7084 PA |
3958 | /* We may not find an inferior if this was a process exit. */ |
3959 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
4c2f2a79 | 3960 | proceeded = normal_stop (); |
243a9253 | 3961 | |
4c2f2a79 PA |
3962 | if (!proceeded) |
3963 | { | |
3964 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
3965 | cmd_done = 1; | |
3966 | } | |
388a7084 | 3967 | } |
0f641c01 | 3968 | } |
43ff13b4 | 3969 | } |
4f8d22e3 | 3970 | |
29f49a6a PA |
3971 | /* No error, don't finish the thread states yet. */ |
3972 | discard_cleanups (ts_old_chain); | |
3973 | ||
4f8d22e3 PA |
3974 | /* Revert thread and frame. */ |
3975 | do_cleanups (old_chain); | |
3976 | ||
3977 | /* If the inferior was in sync execution mode, and now isn't, | |
0f641c01 PA |
3978 | restore the prompt (a synchronous execution command has finished, |
3979 | and we're ready for input). */ | |
b4a14fd0 | 3980 | if (interpreter_async && was_sync && !sync_execution) |
92bcb5f9 | 3981 | observer_notify_sync_execution_done (); |
0f641c01 PA |
3982 | |
3983 | if (cmd_done | |
3984 | && !was_sync | |
3985 | && exec_done_display_p | |
3986 | && (ptid_equal (inferior_ptid, null_ptid) | |
3987 | || !is_running (inferior_ptid))) | |
3988 | printf_unfiltered (_("completed.\n")); | |
43ff13b4 JM |
3989 | } |
3990 | ||
edb3359d DJ |
3991 | /* Record the frame and location we're currently stepping through. */ |
3992 | void | |
3993 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
3994 | { | |
3995 | struct thread_info *tp = inferior_thread (); | |
3996 | ||
16c381f0 JK |
3997 | tp->control.step_frame_id = get_frame_id (frame); |
3998 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
3999 | |
4000 | tp->current_symtab = sal.symtab; | |
4001 | tp->current_line = sal.line; | |
4002 | } | |
4003 | ||
0d1e5fa7 PA |
4004 | /* Clear context switchable stepping state. */ |
4005 | ||
4006 | void | |
4e1c45ea | 4007 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4008 | { |
7f5ef605 | 4009 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4010 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4011 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4012 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4013 | } |
4014 | ||
c32c64b7 DE |
4015 | /* Set the cached copy of the last ptid/waitstatus. */ |
4016 | ||
6efcd9a8 | 4017 | void |
c32c64b7 DE |
4018 | set_last_target_status (ptid_t ptid, struct target_waitstatus status) |
4019 | { | |
4020 | target_last_wait_ptid = ptid; | |
4021 | target_last_waitstatus = status; | |
4022 | } | |
4023 | ||
e02bc4cc | 4024 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
4025 | target_wait()/deprecated_target_wait_hook(). The data is actually |
4026 | cached by handle_inferior_event(), which gets called immediately | |
4027 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
4028 | |
4029 | void | |
488f131b | 4030 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 4031 | { |
39f77062 | 4032 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
4033 | *status = target_last_waitstatus; |
4034 | } | |
4035 | ||
ac264b3b MS |
4036 | void |
4037 | nullify_last_target_wait_ptid (void) | |
4038 | { | |
4039 | target_last_wait_ptid = minus_one_ptid; | |
4040 | } | |
4041 | ||
dcf4fbde | 4042 | /* Switch thread contexts. */ |
dd80620e MS |
4043 | |
4044 | static void | |
0d1e5fa7 | 4045 | context_switch (ptid_t ptid) |
dd80620e | 4046 | { |
4b51d87b | 4047 | if (debug_infrun && !ptid_equal (ptid, inferior_ptid)) |
fd48f117 DJ |
4048 | { |
4049 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
4050 | target_pid_to_str (inferior_ptid)); | |
4051 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 4052 | target_pid_to_str (ptid)); |
fd48f117 DJ |
4053 | } |
4054 | ||
0d1e5fa7 | 4055 | switch_to_thread (ptid); |
dd80620e MS |
4056 | } |
4057 | ||
d8dd4d5f PA |
4058 | /* If the target can't tell whether we've hit breakpoints |
4059 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4060 | check whether that could have been caused by a breakpoint. If so, | |
4061 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4062 | ||
4fa8626c | 4063 | static void |
d8dd4d5f PA |
4064 | adjust_pc_after_break (struct thread_info *thread, |
4065 | struct target_waitstatus *ws) | |
4fa8626c | 4066 | { |
24a73cce UW |
4067 | struct regcache *regcache; |
4068 | struct gdbarch *gdbarch; | |
6c95b8df | 4069 | struct address_space *aspace; |
118e6252 | 4070 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4071 | |
4fa8626c DJ |
4072 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4073 | we aren't, just return. | |
9709f61c DJ |
4074 | |
4075 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4076 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4077 | implemented by software breakpoints should be handled through the normal | |
4078 | breakpoint layer. | |
8fb3e588 | 4079 | |
4fa8626c DJ |
4080 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4081 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4082 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4083 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4084 | generates these signals at breakpoints (the code has been in GDB since at | |
4085 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4086 | |
e6cf7916 UW |
4087 | In earlier versions of GDB, a target with |
4088 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4089 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4090 | target with both of these set in GDB history, and it seems unlikely to be | |
4091 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4092 | |
d8dd4d5f | 4093 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4094 | return; |
4095 | ||
d8dd4d5f | 4096 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4097 | return; |
4098 | ||
4058b839 PA |
4099 | /* In reverse execution, when a breakpoint is hit, the instruction |
4100 | under it has already been de-executed. The reported PC always | |
4101 | points at the breakpoint address, so adjusting it further would | |
4102 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4103 | architecture: | |
4104 | ||
4105 | B1 0x08000000 : INSN1 | |
4106 | B2 0x08000001 : INSN2 | |
4107 | 0x08000002 : INSN3 | |
4108 | PC -> 0x08000003 : INSN4 | |
4109 | ||
4110 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4111 | from that point should hit B2 as below. Reading the PC when the | |
4112 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4113 | been de-executed already. | |
4114 | ||
4115 | B1 0x08000000 : INSN1 | |
4116 | B2 PC -> 0x08000001 : INSN2 | |
4117 | 0x08000002 : INSN3 | |
4118 | 0x08000003 : INSN4 | |
4119 | ||
4120 | We can't apply the same logic as for forward execution, because | |
4121 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4122 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4123 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4124 | behaviour. */ | |
4125 | if (execution_direction == EXEC_REVERSE) | |
4126 | return; | |
4127 | ||
1cf4d951 PA |
4128 | /* If the target can tell whether the thread hit a SW breakpoint, |
4129 | trust it. Targets that can tell also adjust the PC | |
4130 | themselves. */ | |
4131 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4132 | return; | |
4133 | ||
4134 | /* Note that relying on whether a breakpoint is planted in memory to | |
4135 | determine this can fail. E.g,. the breakpoint could have been | |
4136 | removed since. Or the thread could have been told to step an | |
4137 | instruction the size of a breakpoint instruction, and only | |
4138 | _after_ was a breakpoint inserted at its address. */ | |
4139 | ||
24a73cce UW |
4140 | /* If this target does not decrement the PC after breakpoints, then |
4141 | we have nothing to do. */ | |
d8dd4d5f | 4142 | regcache = get_thread_regcache (thread->ptid); |
24a73cce | 4143 | gdbarch = get_regcache_arch (regcache); |
118e6252 | 4144 | |
527a273a | 4145 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4146 | if (decr_pc == 0) |
24a73cce UW |
4147 | return; |
4148 | ||
6c95b8df PA |
4149 | aspace = get_regcache_aspace (regcache); |
4150 | ||
8aad930b AC |
4151 | /* Find the location where (if we've hit a breakpoint) the |
4152 | breakpoint would be. */ | |
118e6252 | 4153 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4154 | |
1cf4d951 PA |
4155 | /* If the target can't tell whether a software breakpoint triggered, |
4156 | fallback to figuring it out based on breakpoints we think were | |
4157 | inserted in the target, and on whether the thread was stepped or | |
4158 | continued. */ | |
4159 | ||
1c5cfe86 PA |
4160 | /* Check whether there actually is a software breakpoint inserted at |
4161 | that location. | |
4162 | ||
4163 | If in non-stop mode, a race condition is possible where we've | |
4164 | removed a breakpoint, but stop events for that breakpoint were | |
4165 | already queued and arrive later. To suppress those spurious | |
4166 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4167 | and retire them after a number of stop events are reported. Note |
4168 | this is an heuristic and can thus get confused. The real fix is | |
4169 | to get the "stopped by SW BP and needs adjustment" info out of | |
4170 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4171 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4172 | || (target_is_non_stop_p () |
4173 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4174 | { |
77f9e713 | 4175 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); |
abbb1732 | 4176 | |
8213266a | 4177 | if (record_full_is_used ()) |
77f9e713 | 4178 | record_full_gdb_operation_disable_set (); |
96429cc8 | 4179 | |
1c0fdd0e UW |
4180 | /* When using hardware single-step, a SIGTRAP is reported for both |
4181 | a completed single-step and a software breakpoint. Need to | |
4182 | differentiate between the two, as the latter needs adjusting | |
4183 | but the former does not. | |
4184 | ||
4185 | The SIGTRAP can be due to a completed hardware single-step only if | |
4186 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4187 | - this thread is currently being stepped |
4188 | ||
4189 | If any of these events did not occur, we must have stopped due | |
4190 | to hitting a software breakpoint, and have to back up to the | |
4191 | breakpoint address. | |
4192 | ||
4193 | As a special case, we could have hardware single-stepped a | |
4194 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4195 | we also need to back up to the breakpoint address. */ | |
4196 | ||
d8dd4d5f PA |
4197 | if (thread_has_single_step_breakpoints_set (thread) |
4198 | || !currently_stepping (thread) | |
4199 | || (thread->stepped_breakpoint | |
4200 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4201 | regcache_write_pc (regcache, breakpoint_pc); |
96429cc8 | 4202 | |
77f9e713 | 4203 | do_cleanups (old_cleanups); |
8aad930b | 4204 | } |
4fa8626c DJ |
4205 | } |
4206 | ||
edb3359d DJ |
4207 | static int |
4208 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4209 | { | |
4210 | for (frame = get_prev_frame (frame); | |
4211 | frame != NULL; | |
4212 | frame = get_prev_frame (frame)) | |
4213 | { | |
4214 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4215 | return 1; | |
4216 | if (get_frame_type (frame) != INLINE_FRAME) | |
4217 | break; | |
4218 | } | |
4219 | ||
4220 | return 0; | |
4221 | } | |
4222 | ||
a96d9b2e SDJ |
4223 | /* Auxiliary function that handles syscall entry/return events. |
4224 | It returns 1 if the inferior should keep going (and GDB | |
4225 | should ignore the event), or 0 if the event deserves to be | |
4226 | processed. */ | |
ca2163eb | 4227 | |
a96d9b2e | 4228 | static int |
ca2163eb | 4229 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4230 | { |
ca2163eb | 4231 | struct regcache *regcache; |
ca2163eb PA |
4232 | int syscall_number; |
4233 | ||
4234 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
4235 | context_switch (ecs->ptid); | |
4236 | ||
4237 | regcache = get_thread_regcache (ecs->ptid); | |
f90263c1 | 4238 | syscall_number = ecs->ws.value.syscall_number; |
ca2163eb PA |
4239 | stop_pc = regcache_read_pc (regcache); |
4240 | ||
a96d9b2e SDJ |
4241 | if (catch_syscall_enabled () > 0 |
4242 | && catching_syscall_number (syscall_number) > 0) | |
4243 | { | |
4244 | if (debug_infrun) | |
4245 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
4246 | syscall_number); | |
a96d9b2e | 4247 | |
16c381f0 | 4248 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4249 | = bpstat_stop_status (get_regcache_aspace (regcache), |
09ac7c10 | 4250 | stop_pc, ecs->ptid, &ecs->ws); |
ab04a2af | 4251 | |
ce12b012 | 4252 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4253 | { |
4254 | /* Catchpoint hit. */ | |
ca2163eb PA |
4255 | return 0; |
4256 | } | |
a96d9b2e | 4257 | } |
ca2163eb PA |
4258 | |
4259 | /* If no catchpoint triggered for this, then keep going. */ | |
ca2163eb PA |
4260 | keep_going (ecs); |
4261 | return 1; | |
a96d9b2e SDJ |
4262 | } |
4263 | ||
7e324e48 GB |
4264 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4265 | ||
4266 | static void | |
4267 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4268 | struct execution_control_state *ecs) | |
4269 | { | |
4270 | if (!ecs->stop_func_filled_in) | |
4271 | { | |
4272 | /* Don't care about return value; stop_func_start and stop_func_name | |
4273 | will both be 0 if it doesn't work. */ | |
4274 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
4275 | &ecs->stop_func_start, &ecs->stop_func_end); | |
4276 | ecs->stop_func_start | |
4277 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4278 | ||
591a12a1 UW |
4279 | if (gdbarch_skip_entrypoint_p (gdbarch)) |
4280 | ecs->stop_func_start = gdbarch_skip_entrypoint (gdbarch, | |
4281 | ecs->stop_func_start); | |
4282 | ||
7e324e48 GB |
4283 | ecs->stop_func_filled_in = 1; |
4284 | } | |
4285 | } | |
4286 | ||
4f5d7f63 PA |
4287 | |
4288 | /* Return the STOP_SOON field of the inferior pointed at by PTID. */ | |
4289 | ||
4290 | static enum stop_kind | |
4291 | get_inferior_stop_soon (ptid_t ptid) | |
4292 | { | |
c9657e70 | 4293 | struct inferior *inf = find_inferior_ptid (ptid); |
4f5d7f63 PA |
4294 | |
4295 | gdb_assert (inf != NULL); | |
4296 | return inf->control.stop_soon; | |
4297 | } | |
4298 | ||
372316f1 PA |
4299 | /* Wait for one event. Store the resulting waitstatus in WS, and |
4300 | return the event ptid. */ | |
4301 | ||
4302 | static ptid_t | |
4303 | wait_one (struct target_waitstatus *ws) | |
4304 | { | |
4305 | ptid_t event_ptid; | |
4306 | ptid_t wait_ptid = minus_one_ptid; | |
4307 | ||
4308 | overlay_cache_invalid = 1; | |
4309 | ||
4310 | /* Flush target cache before starting to handle each event. | |
4311 | Target was running and cache could be stale. This is just a | |
4312 | heuristic. Running threads may modify target memory, but we | |
4313 | don't get any event. */ | |
4314 | target_dcache_invalidate (); | |
4315 | ||
4316 | if (deprecated_target_wait_hook) | |
4317 | event_ptid = deprecated_target_wait_hook (wait_ptid, ws, 0); | |
4318 | else | |
4319 | event_ptid = target_wait (wait_ptid, ws, 0); | |
4320 | ||
4321 | if (debug_infrun) | |
4322 | print_target_wait_results (wait_ptid, event_ptid, ws); | |
4323 | ||
4324 | return event_ptid; | |
4325 | } | |
4326 | ||
4327 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID | |
4328 | instead of the current thread. */ | |
4329 | #define THREAD_STOPPED_BY(REASON) \ | |
4330 | static int \ | |
4331 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4332 | { \ | |
4333 | struct cleanup *old_chain; \ | |
4334 | int res; \ | |
4335 | \ | |
4336 | old_chain = save_inferior_ptid (); \ | |
4337 | inferior_ptid = ptid; \ | |
4338 | \ | |
4339 | res = target_stopped_by_ ## REASON (); \ | |
4340 | \ | |
4341 | do_cleanups (old_chain); \ | |
4342 | \ | |
4343 | return res; \ | |
4344 | } | |
4345 | ||
4346 | /* Generate thread_stopped_by_watchpoint. */ | |
4347 | THREAD_STOPPED_BY (watchpoint) | |
4348 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4349 | THREAD_STOPPED_BY (sw_breakpoint) | |
4350 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4351 | THREAD_STOPPED_BY (hw_breakpoint) | |
4352 | ||
4353 | /* Cleanups that switches to the PTID pointed at by PTID_P. */ | |
4354 | ||
4355 | static void | |
4356 | switch_to_thread_cleanup (void *ptid_p) | |
4357 | { | |
4358 | ptid_t ptid = *(ptid_t *) ptid_p; | |
4359 | ||
4360 | switch_to_thread (ptid); | |
4361 | } | |
4362 | ||
4363 | /* Save the thread's event and stop reason to process it later. */ | |
4364 | ||
4365 | static void | |
4366 | save_waitstatus (struct thread_info *tp, struct target_waitstatus *ws) | |
4367 | { | |
4368 | struct regcache *regcache; | |
4369 | struct address_space *aspace; | |
4370 | ||
4371 | if (debug_infrun) | |
4372 | { | |
4373 | char *statstr; | |
4374 | ||
4375 | statstr = target_waitstatus_to_string (ws); | |
4376 | fprintf_unfiltered (gdb_stdlog, | |
4377 | "infrun: saving status %s for %d.%ld.%ld\n", | |
4378 | statstr, | |
4379 | ptid_get_pid (tp->ptid), | |
4380 | ptid_get_lwp (tp->ptid), | |
4381 | ptid_get_tid (tp->ptid)); | |
4382 | xfree (statstr); | |
4383 | } | |
4384 | ||
4385 | /* Record for later. */ | |
4386 | tp->suspend.waitstatus = *ws; | |
4387 | tp->suspend.waitstatus_pending_p = 1; | |
4388 | ||
4389 | regcache = get_thread_regcache (tp->ptid); | |
4390 | aspace = get_regcache_aspace (regcache); | |
4391 | ||
4392 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4393 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4394 | { | |
4395 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4396 | ||
4397 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4398 | ||
4399 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4400 | { | |
4401 | tp->suspend.stop_reason | |
4402 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4403 | } | |
4404 | else if (target_supports_stopped_by_sw_breakpoint () | |
4405 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4406 | { | |
4407 | tp->suspend.stop_reason | |
4408 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4409 | } | |
4410 | else if (target_supports_stopped_by_hw_breakpoint () | |
4411 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4412 | { | |
4413 | tp->suspend.stop_reason | |
4414 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4415 | } | |
4416 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4417 | && hardware_breakpoint_inserted_here_p (aspace, | |
4418 | pc)) | |
4419 | { | |
4420 | tp->suspend.stop_reason | |
4421 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4422 | } | |
4423 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4424 | && software_breakpoint_inserted_here_p (aspace, | |
4425 | pc)) | |
4426 | { | |
4427 | tp->suspend.stop_reason | |
4428 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4429 | } | |
4430 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4431 | && currently_stepping (tp)) | |
4432 | { | |
4433 | tp->suspend.stop_reason | |
4434 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4435 | } | |
4436 | } | |
4437 | } | |
4438 | ||
65706a29 PA |
4439 | /* A cleanup that disables thread create/exit events. */ |
4440 | ||
4441 | static void | |
4442 | disable_thread_events (void *arg) | |
4443 | { | |
4444 | target_thread_events (0); | |
4445 | } | |
4446 | ||
6efcd9a8 | 4447 | /* See infrun.h. */ |
372316f1 | 4448 | |
6efcd9a8 | 4449 | void |
372316f1 PA |
4450 | stop_all_threads (void) |
4451 | { | |
4452 | /* We may need multiple passes to discover all threads. */ | |
4453 | int pass; | |
4454 | int iterations = 0; | |
4455 | ptid_t entry_ptid; | |
4456 | struct cleanup *old_chain; | |
4457 | ||
fbea99ea | 4458 | gdb_assert (target_is_non_stop_p ()); |
372316f1 PA |
4459 | |
4460 | if (debug_infrun) | |
4461 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n"); | |
4462 | ||
4463 | entry_ptid = inferior_ptid; | |
4464 | old_chain = make_cleanup (switch_to_thread_cleanup, &entry_ptid); | |
4465 | ||
65706a29 PA |
4466 | target_thread_events (1); |
4467 | make_cleanup (disable_thread_events, NULL); | |
4468 | ||
372316f1 PA |
4469 | /* Request threads to stop, and then wait for the stops. Because |
4470 | threads we already know about can spawn more threads while we're | |
4471 | trying to stop them, and we only learn about new threads when we | |
4472 | update the thread list, do this in a loop, and keep iterating | |
4473 | until two passes find no threads that need to be stopped. */ | |
4474 | for (pass = 0; pass < 2; pass++, iterations++) | |
4475 | { | |
4476 | if (debug_infrun) | |
4477 | fprintf_unfiltered (gdb_stdlog, | |
4478 | "infrun: stop_all_threads, pass=%d, " | |
4479 | "iterations=%d\n", pass, iterations); | |
4480 | while (1) | |
4481 | { | |
4482 | ptid_t event_ptid; | |
4483 | struct target_waitstatus ws; | |
4484 | int need_wait = 0; | |
4485 | struct thread_info *t; | |
4486 | ||
4487 | update_thread_list (); | |
4488 | ||
4489 | /* Go through all threads looking for threads that we need | |
4490 | to tell the target to stop. */ | |
4491 | ALL_NON_EXITED_THREADS (t) | |
4492 | { | |
4493 | if (t->executing) | |
4494 | { | |
4495 | /* If already stopping, don't request a stop again. | |
4496 | We just haven't seen the notification yet. */ | |
4497 | if (!t->stop_requested) | |
4498 | { | |
4499 | if (debug_infrun) | |
4500 | fprintf_unfiltered (gdb_stdlog, | |
4501 | "infrun: %s executing, " | |
4502 | "need stop\n", | |
4503 | target_pid_to_str (t->ptid)); | |
4504 | target_stop (t->ptid); | |
4505 | t->stop_requested = 1; | |
4506 | } | |
4507 | else | |
4508 | { | |
4509 | if (debug_infrun) | |
4510 | fprintf_unfiltered (gdb_stdlog, | |
4511 | "infrun: %s executing, " | |
4512 | "already stopping\n", | |
4513 | target_pid_to_str (t->ptid)); | |
4514 | } | |
4515 | ||
4516 | if (t->stop_requested) | |
4517 | need_wait = 1; | |
4518 | } | |
4519 | else | |
4520 | { | |
4521 | if (debug_infrun) | |
4522 | fprintf_unfiltered (gdb_stdlog, | |
4523 | "infrun: %s not executing\n", | |
4524 | target_pid_to_str (t->ptid)); | |
4525 | ||
4526 | /* The thread may be not executing, but still be | |
4527 | resumed with a pending status to process. */ | |
4528 | t->resumed = 0; | |
4529 | } | |
4530 | } | |
4531 | ||
4532 | if (!need_wait) | |
4533 | break; | |
4534 | ||
4535 | /* If we find new threads on the second iteration, restart | |
4536 | over. We want to see two iterations in a row with all | |
4537 | threads stopped. */ | |
4538 | if (pass > 0) | |
4539 | pass = -1; | |
4540 | ||
4541 | event_ptid = wait_one (&ws); | |
4542 | if (ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4543 | { | |
4544 | /* All resumed threads exited. */ | |
4545 | } | |
65706a29 PA |
4546 | else if (ws.kind == TARGET_WAITKIND_THREAD_EXITED |
4547 | || ws.kind == TARGET_WAITKIND_EXITED | |
372316f1 PA |
4548 | || ws.kind == TARGET_WAITKIND_SIGNALLED) |
4549 | { | |
4550 | if (debug_infrun) | |
4551 | { | |
4552 | ptid_t ptid = pid_to_ptid (ws.value.integer); | |
4553 | ||
4554 | fprintf_unfiltered (gdb_stdlog, | |
4555 | "infrun: %s exited while " | |
4556 | "stopping threads\n", | |
4557 | target_pid_to_str (ptid)); | |
4558 | } | |
4559 | } | |
4560 | else | |
4561 | { | |
6efcd9a8 PA |
4562 | struct inferior *inf; |
4563 | ||
372316f1 PA |
4564 | t = find_thread_ptid (event_ptid); |
4565 | if (t == NULL) | |
4566 | t = add_thread (event_ptid); | |
4567 | ||
4568 | t->stop_requested = 0; | |
4569 | t->executing = 0; | |
4570 | t->resumed = 0; | |
4571 | t->control.may_range_step = 0; | |
4572 | ||
6efcd9a8 PA |
4573 | /* This may be the first time we see the inferior report |
4574 | a stop. */ | |
4575 | inf = find_inferior_ptid (event_ptid); | |
4576 | if (inf->needs_setup) | |
4577 | { | |
4578 | switch_to_thread_no_regs (t); | |
4579 | setup_inferior (0); | |
4580 | } | |
4581 | ||
372316f1 PA |
4582 | if (ws.kind == TARGET_WAITKIND_STOPPED |
4583 | && ws.value.sig == GDB_SIGNAL_0) | |
4584 | { | |
4585 | /* We caught the event that we intended to catch, so | |
4586 | there's no event pending. */ | |
4587 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4588 | t->suspend.waitstatus_pending_p = 0; | |
4589 | ||
4590 | if (displaced_step_fixup (t->ptid, GDB_SIGNAL_0) < 0) | |
4591 | { | |
4592 | /* Add it back to the step-over queue. */ | |
4593 | if (debug_infrun) | |
4594 | { | |
4595 | fprintf_unfiltered (gdb_stdlog, | |
4596 | "infrun: displaced-step of %s " | |
4597 | "canceled: adding back to the " | |
4598 | "step-over queue\n", | |
4599 | target_pid_to_str (t->ptid)); | |
4600 | } | |
4601 | t->control.trap_expected = 0; | |
4602 | thread_step_over_chain_enqueue (t); | |
4603 | } | |
4604 | } | |
4605 | else | |
4606 | { | |
4607 | enum gdb_signal sig; | |
4608 | struct regcache *regcache; | |
4609 | struct address_space *aspace; | |
4610 | ||
4611 | if (debug_infrun) | |
4612 | { | |
4613 | char *statstr; | |
4614 | ||
4615 | statstr = target_waitstatus_to_string (&ws); | |
4616 | fprintf_unfiltered (gdb_stdlog, | |
4617 | "infrun: target_wait %s, saving " | |
4618 | "status for %d.%ld.%ld\n", | |
4619 | statstr, | |
4620 | ptid_get_pid (t->ptid), | |
4621 | ptid_get_lwp (t->ptid), | |
4622 | ptid_get_tid (t->ptid)); | |
4623 | xfree (statstr); | |
4624 | } | |
4625 | ||
4626 | /* Record for later. */ | |
4627 | save_waitstatus (t, &ws); | |
4628 | ||
4629 | sig = (ws.kind == TARGET_WAITKIND_STOPPED | |
4630 | ? ws.value.sig : GDB_SIGNAL_0); | |
4631 | ||
4632 | if (displaced_step_fixup (t->ptid, sig) < 0) | |
4633 | { | |
4634 | /* Add it back to the step-over queue. */ | |
4635 | t->control.trap_expected = 0; | |
4636 | thread_step_over_chain_enqueue (t); | |
4637 | } | |
4638 | ||
4639 | regcache = get_thread_regcache (t->ptid); | |
4640 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4641 | ||
4642 | if (debug_infrun) | |
4643 | { | |
4644 | fprintf_unfiltered (gdb_stdlog, | |
4645 | "infrun: saved stop_pc=%s for %s " | |
4646 | "(currently_stepping=%d)\n", | |
4647 | paddress (target_gdbarch (), | |
4648 | t->suspend.stop_pc), | |
4649 | target_pid_to_str (t->ptid), | |
4650 | currently_stepping (t)); | |
4651 | } | |
4652 | } | |
4653 | } | |
4654 | } | |
4655 | } | |
4656 | ||
4657 | do_cleanups (old_chain); | |
4658 | ||
4659 | if (debug_infrun) | |
4660 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n"); | |
4661 | } | |
4662 | ||
f4836ba9 PA |
4663 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4664 | ||
4665 | static int | |
4666 | handle_no_resumed (struct execution_control_state *ecs) | |
4667 | { | |
4668 | struct inferior *inf; | |
4669 | struct thread_info *thread; | |
4670 | ||
4671 | if (target_can_async_p () && !sync_execution) | |
4672 | { | |
4673 | /* There were no unwaited-for children left in the target, but, | |
4674 | we're not synchronously waiting for events either. Just | |
4675 | ignore. */ | |
4676 | ||
4677 | if (debug_infrun) | |
4678 | fprintf_unfiltered (gdb_stdlog, | |
4679 | "infrun: TARGET_WAITKIND_NO_RESUMED " "(ignoring: bg)\n"); | |
4680 | prepare_to_wait (ecs); | |
4681 | return 1; | |
4682 | } | |
4683 | ||
4684 | /* Otherwise, if we were running a synchronous execution command, we | |
4685 | may need to cancel it and give the user back the terminal. | |
4686 | ||
4687 | In non-stop mode, the target can't tell whether we've already | |
4688 | consumed previous stop events, so it can end up sending us a | |
4689 | no-resumed event like so: | |
4690 | ||
4691 | #0 - thread 1 is left stopped | |
4692 | ||
4693 | #1 - thread 2 is resumed and hits breakpoint | |
4694 | -> TARGET_WAITKIND_STOPPED | |
4695 | ||
4696 | #2 - thread 3 is resumed and exits | |
4697 | this is the last resumed thread, so | |
4698 | -> TARGET_WAITKIND_NO_RESUMED | |
4699 | ||
4700 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4701 | it. | |
4702 | ||
4703 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4704 | thread 2 is now resumed, so the event should be ignored. | |
4705 | ||
4706 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4707 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4708 | event. But it could be that the event meant that thread 2 itself | |
4709 | (or whatever other thread was the last resumed thread) exited. | |
4710 | ||
4711 | To address this we refresh the thread list and check whether we | |
4712 | have resumed threads _now_. In the example above, this removes | |
4713 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4714 | ignore this event. If we find no thread resumed, then we cancel | |
4715 | the synchronous command show "no unwaited-for " to the user. */ | |
4716 | update_thread_list (); | |
4717 | ||
4718 | ALL_NON_EXITED_THREADS (thread) | |
4719 | { | |
4720 | if (thread->executing | |
4721 | || thread->suspend.waitstatus_pending_p) | |
4722 | { | |
4723 | /* There were no unwaited-for children left in the target at | |
4724 | some point, but there are now. Just ignore. */ | |
4725 | if (debug_infrun) | |
4726 | fprintf_unfiltered (gdb_stdlog, | |
4727 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4728 | "(ignoring: found resumed)\n"); | |
4729 | prepare_to_wait (ecs); | |
4730 | return 1; | |
4731 | } | |
4732 | } | |
4733 | ||
4734 | /* Note however that we may find no resumed thread because the whole | |
4735 | process exited meanwhile (thus updating the thread list results | |
4736 | in an empty thread list). In this case we know we'll be getting | |
4737 | a process exit event shortly. */ | |
4738 | ALL_INFERIORS (inf) | |
4739 | { | |
4740 | if (inf->pid == 0) | |
4741 | continue; | |
4742 | ||
4743 | thread = any_live_thread_of_process (inf->pid); | |
4744 | if (thread == NULL) | |
4745 | { | |
4746 | if (debug_infrun) | |
4747 | fprintf_unfiltered (gdb_stdlog, | |
4748 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4749 | "(expect process exit)\n"); | |
4750 | prepare_to_wait (ecs); | |
4751 | return 1; | |
4752 | } | |
4753 | } | |
4754 | ||
4755 | /* Go ahead and report the event. */ | |
4756 | return 0; | |
4757 | } | |
4758 | ||
05ba8510 PA |
4759 | /* Given an execution control state that has been freshly filled in by |
4760 | an event from the inferior, figure out what it means and take | |
4761 | appropriate action. | |
4762 | ||
4763 | The alternatives are: | |
4764 | ||
22bcd14b | 4765 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
4766 | debugger. |
4767 | ||
4768 | 2) keep_going and return; to wait for the next event (set | |
4769 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
4770 | once). */ | |
c906108c | 4771 | |
ec9499be | 4772 | static void |
0b6e5e10 | 4773 | handle_inferior_event_1 (struct execution_control_state *ecs) |
cd0fc7c3 | 4774 | { |
d6b48e9c PA |
4775 | enum stop_kind stop_soon; |
4776 | ||
28736962 PA |
4777 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
4778 | { | |
4779 | /* We had an event in the inferior, but we are not interested in | |
4780 | handling it at this level. The lower layers have already | |
4781 | done what needs to be done, if anything. | |
4782 | ||
4783 | One of the possible circumstances for this is when the | |
4784 | inferior produces output for the console. The inferior has | |
4785 | not stopped, and we are ignoring the event. Another possible | |
4786 | circumstance is any event which the lower level knows will be | |
4787 | reported multiple times without an intervening resume. */ | |
4788 | if (debug_infrun) | |
4789 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
4790 | prepare_to_wait (ecs); | |
4791 | return; | |
4792 | } | |
4793 | ||
65706a29 PA |
4794 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
4795 | { | |
4796 | if (debug_infrun) | |
4797 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_THREAD_EXITED\n"); | |
4798 | prepare_to_wait (ecs); | |
4799 | return; | |
4800 | } | |
4801 | ||
0e5bf2a8 | 4802 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
4803 | && handle_no_resumed (ecs)) |
4804 | return; | |
0e5bf2a8 | 4805 | |
1777feb0 | 4806 | /* Cache the last pid/waitstatus. */ |
c32c64b7 | 4807 | set_last_target_status (ecs->ptid, ecs->ws); |
e02bc4cc | 4808 | |
ca005067 | 4809 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 4810 | stop_stack_dummy = STOP_NONE; |
ca005067 | 4811 | |
0e5bf2a8 PA |
4812 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
4813 | { | |
4814 | /* No unwaited-for children left. IOW, all resumed children | |
4815 | have exited. */ | |
4816 | if (debug_infrun) | |
4817 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
4818 | ||
4819 | stop_print_frame = 0; | |
22bcd14b | 4820 | stop_waiting (ecs); |
0e5bf2a8 PA |
4821 | return; |
4822 | } | |
4823 | ||
8c90c137 | 4824 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 4825 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 PA |
4826 | { |
4827 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
4828 | /* If it's a new thread, add it to the thread database. */ | |
4829 | if (ecs->event_thread == NULL) | |
4830 | ecs->event_thread = add_thread (ecs->ptid); | |
c1e36e3e PA |
4831 | |
4832 | /* Disable range stepping. If the next step request could use a | |
4833 | range, this will be end up re-enabled then. */ | |
4834 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 4835 | } |
88ed393a JK |
4836 | |
4837 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 4838 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
4839 | |
4840 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
4841 | reinit_frame_cache (); | |
4842 | ||
28736962 PA |
4843 | breakpoint_retire_moribund (); |
4844 | ||
2b009048 DJ |
4845 | /* First, distinguish signals caused by the debugger from signals |
4846 | that have to do with the program's own actions. Note that | |
4847 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
4848 | on the operating system version. Here we detect when a SIGILL or | |
4849 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
4850 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
4851 | when we're trying to execute a breakpoint instruction on a | |
4852 | non-executable stack. This happens for call dummy breakpoints | |
4853 | for architectures like SPARC that place call dummies on the | |
4854 | stack. */ | |
2b009048 | 4855 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
4856 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
4857 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
4858 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 4859 | { |
de0a0249 UW |
4860 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
4861 | ||
4862 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
4863 | regcache_read_pc (regcache))) | |
4864 | { | |
4865 | if (debug_infrun) | |
4866 | fprintf_unfiltered (gdb_stdlog, | |
4867 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 4868 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 4869 | } |
2b009048 DJ |
4870 | } |
4871 | ||
28736962 PA |
4872 | /* Mark the non-executing threads accordingly. In all-stop, all |
4873 | threads of all processes are stopped when we get any event | |
e1316e60 | 4874 | reported. In non-stop mode, only the event thread stops. */ |
372316f1 PA |
4875 | { |
4876 | ptid_t mark_ptid; | |
4877 | ||
fbea99ea | 4878 | if (!target_is_non_stop_p ()) |
372316f1 PA |
4879 | mark_ptid = minus_one_ptid; |
4880 | else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED | |
4881 | || ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4882 | { | |
4883 | /* If we're handling a process exit in non-stop mode, even | |
4884 | though threads haven't been deleted yet, one would think | |
4885 | that there is nothing to do, as threads of the dead process | |
4886 | will be soon deleted, and threads of any other process were | |
4887 | left running. However, on some targets, threads survive a | |
4888 | process exit event. E.g., for the "checkpoint" command, | |
4889 | when the current checkpoint/fork exits, linux-fork.c | |
4890 | automatically switches to another fork from within | |
4891 | target_mourn_inferior, by associating the same | |
4892 | inferior/thread to another fork. We haven't mourned yet at | |
4893 | this point, but we must mark any threads left in the | |
4894 | process as not-executing so that finish_thread_state marks | |
4895 | them stopped (in the user's perspective) if/when we present | |
4896 | the stop to the user. */ | |
4897 | mark_ptid = pid_to_ptid (ptid_get_pid (ecs->ptid)); | |
4898 | } | |
4899 | else | |
4900 | mark_ptid = ecs->ptid; | |
4901 | ||
4902 | set_executing (mark_ptid, 0); | |
4903 | ||
4904 | /* Likewise the resumed flag. */ | |
4905 | set_resumed (mark_ptid, 0); | |
4906 | } | |
8c90c137 | 4907 | |
488f131b JB |
4908 | switch (ecs->ws.kind) |
4909 | { | |
4910 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 4911 | if (debug_infrun) |
8a9de0e4 | 4912 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
5c09a2c5 PA |
4913 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
4914 | context_switch (ecs->ptid); | |
b0f4b84b DJ |
4915 | /* Ignore gracefully during startup of the inferior, as it might |
4916 | be the shell which has just loaded some objects, otherwise | |
4917 | add the symbols for the newly loaded objects. Also ignore at | |
4918 | the beginning of an attach or remote session; we will query | |
4919 | the full list of libraries once the connection is | |
4920 | established. */ | |
4f5d7f63 PA |
4921 | |
4922 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
c0236d92 | 4923 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 4924 | { |
edcc5120 TT |
4925 | struct regcache *regcache; |
4926 | ||
edcc5120 TT |
4927 | regcache = get_thread_regcache (ecs->ptid); |
4928 | ||
4929 | handle_solib_event (); | |
4930 | ||
4931 | ecs->event_thread->control.stop_bpstat | |
4932 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
4933 | stop_pc, ecs->ptid, &ecs->ws); | |
ab04a2af | 4934 | |
ce12b012 | 4935 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
4936 | { |
4937 | /* A catchpoint triggered. */ | |
94c57d6a PA |
4938 | process_event_stop_test (ecs); |
4939 | return; | |
edcc5120 | 4940 | } |
488f131b | 4941 | |
b0f4b84b DJ |
4942 | /* If requested, stop when the dynamic linker notifies |
4943 | gdb of events. This allows the user to get control | |
4944 | and place breakpoints in initializer routines for | |
4945 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 4946 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
4947 | if (stop_on_solib_events) |
4948 | { | |
55409f9d DJ |
4949 | /* Make sure we print "Stopped due to solib-event" in |
4950 | normal_stop. */ | |
4951 | stop_print_frame = 1; | |
4952 | ||
22bcd14b | 4953 | stop_waiting (ecs); |
b0f4b84b DJ |
4954 | return; |
4955 | } | |
488f131b | 4956 | } |
b0f4b84b DJ |
4957 | |
4958 | /* If we are skipping through a shell, or through shared library | |
4959 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 4960 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
4961 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
4962 | { | |
74960c60 VP |
4963 | /* Loading of shared libraries might have changed breakpoint |
4964 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 4965 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 4966 | insert_breakpoints (); |
64ce06e4 | 4967 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
4968 | prepare_to_wait (ecs); |
4969 | return; | |
4970 | } | |
4971 | ||
5c09a2c5 PA |
4972 | /* But stop if we're attaching or setting up a remote |
4973 | connection. */ | |
4974 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
4975 | || stop_soon == STOP_QUIETLY_REMOTE) | |
4976 | { | |
4977 | if (debug_infrun) | |
4978 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 4979 | stop_waiting (ecs); |
5c09a2c5 PA |
4980 | return; |
4981 | } | |
4982 | ||
4983 | internal_error (__FILE__, __LINE__, | |
4984 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 4985 | |
488f131b | 4986 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 4987 | if (debug_infrun) |
8a9de0e4 | 4988 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
64776a0b | 4989 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
8b3ee56d | 4990 | context_switch (ecs->ptid); |
64ce06e4 | 4991 | resume (GDB_SIGNAL_0); |
488f131b JB |
4992 | prepare_to_wait (ecs); |
4993 | return; | |
c5aa993b | 4994 | |
65706a29 PA |
4995 | case TARGET_WAITKIND_THREAD_CREATED: |
4996 | if (debug_infrun) | |
4997 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_THREAD_CREATED\n"); | |
4998 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
4999 | context_switch (ecs->ptid); | |
5000 | if (!switch_back_to_stepped_thread (ecs)) | |
5001 | keep_going (ecs); | |
5002 | return; | |
5003 | ||
488f131b | 5004 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5005 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 5006 | if (debug_infrun) |
940c3c06 PA |
5007 | { |
5008 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
5009 | fprintf_unfiltered (gdb_stdlog, | |
5010 | "infrun: TARGET_WAITKIND_EXITED\n"); | |
5011 | else | |
5012 | fprintf_unfiltered (gdb_stdlog, | |
5013 | "infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
5014 | } | |
5015 | ||
fb66883a | 5016 | inferior_ptid = ecs->ptid; |
c9657e70 | 5017 | set_current_inferior (find_inferior_ptid (ecs->ptid)); |
6c95b8df PA |
5018 | set_current_program_space (current_inferior ()->pspace); |
5019 | handle_vfork_child_exec_or_exit (0); | |
1777feb0 | 5020 | target_terminal_ours (); /* Must do this before mourn anyway. */ |
488f131b | 5021 | |
0c557179 SDJ |
5022 | /* Clearing any previous state of convenience variables. */ |
5023 | clear_exit_convenience_vars (); | |
5024 | ||
940c3c06 PA |
5025 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5026 | { | |
5027 | /* Record the exit code in the convenience variable $_exitcode, so | |
5028 | that the user can inspect this again later. */ | |
5029 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5030 | (LONGEST) ecs->ws.value.integer); | |
5031 | ||
5032 | /* Also record this in the inferior itself. */ | |
5033 | current_inferior ()->has_exit_code = 1; | |
5034 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5035 | |
98eb56a4 PA |
5036 | /* Support the --return-child-result option. */ |
5037 | return_child_result_value = ecs->ws.value.integer; | |
5038 | ||
fd664c91 | 5039 | observer_notify_exited (ecs->ws.value.integer); |
940c3c06 PA |
5040 | } |
5041 | else | |
0c557179 SDJ |
5042 | { |
5043 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
5044 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
5045 | ||
5046 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5047 | { | |
5048 | /* Set the value of the internal variable $_exitsignal, | |
5049 | which holds the signal uncaught by the inferior. */ | |
5050 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5051 | gdbarch_gdb_signal_to_target (gdbarch, | |
5052 | ecs->ws.value.sig)); | |
5053 | } | |
5054 | else | |
5055 | { | |
5056 | /* We don't have access to the target's method used for | |
5057 | converting between signal numbers (GDB's internal | |
5058 | representation <-> target's representation). | |
5059 | Therefore, we cannot do a good job at displaying this | |
5060 | information to the user. It's better to just warn | |
5061 | her about it (if infrun debugging is enabled), and | |
5062 | give up. */ | |
5063 | if (debug_infrun) | |
5064 | fprintf_filtered (gdb_stdlog, _("\ | |
5065 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
5066 | } | |
5067 | ||
fd664c91 | 5068 | observer_notify_signal_exited (ecs->ws.value.sig); |
0c557179 | 5069 | } |
8cf64490 | 5070 | |
488f131b JB |
5071 | gdb_flush (gdb_stdout); |
5072 | target_mourn_inferior (); | |
488f131b | 5073 | stop_print_frame = 0; |
22bcd14b | 5074 | stop_waiting (ecs); |
488f131b | 5075 | return; |
c5aa993b | 5076 | |
488f131b | 5077 | /* The following are the only cases in which we keep going; |
1777feb0 | 5078 | the above cases end in a continue or goto. */ |
488f131b | 5079 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5080 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 5081 | if (debug_infrun) |
fed708ed PA |
5082 | { |
5083 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
5084 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); | |
5085 | else | |
5086 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n"); | |
5087 | } | |
c906108c | 5088 | |
e2d96639 YQ |
5089 | /* Check whether the inferior is displaced stepping. */ |
5090 | { | |
5091 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
5092 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
e2d96639 YQ |
5093 | |
5094 | /* If checking displaced stepping is supported, and thread | |
5095 | ecs->ptid is displaced stepping. */ | |
c0987663 | 5096 | if (displaced_step_in_progress_thread (ecs->ptid)) |
e2d96639 YQ |
5097 | { |
5098 | struct inferior *parent_inf | |
c9657e70 | 5099 | = find_inferior_ptid (ecs->ptid); |
e2d96639 YQ |
5100 | struct regcache *child_regcache; |
5101 | CORE_ADDR parent_pc; | |
5102 | ||
5103 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
5104 | indicating that the displaced stepping of syscall instruction | |
5105 | has been done. Perform cleanup for parent process here. Note | |
5106 | that this operation also cleans up the child process for vfork, | |
5107 | because their pages are shared. */ | |
a493e3e2 | 5108 | displaced_step_fixup (ecs->ptid, GDB_SIGNAL_TRAP); |
c2829269 PA |
5109 | /* Start a new step-over in another thread if there's one |
5110 | that needs it. */ | |
5111 | start_step_over (); | |
e2d96639 YQ |
5112 | |
5113 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
5114 | { | |
c0987663 YQ |
5115 | struct displaced_step_inferior_state *displaced |
5116 | = get_displaced_stepping_state (ptid_get_pid (ecs->ptid)); | |
5117 | ||
e2d96639 YQ |
5118 | /* Restore scratch pad for child process. */ |
5119 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
5120 | } | |
5121 | ||
5122 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
5123 | the child's PC is also within the scratchpad. Set the child's PC | |
5124 | to the parent's PC value, which has already been fixed up. | |
5125 | FIXME: we use the parent's aspace here, although we're touching | |
5126 | the child, because the child hasn't been added to the inferior | |
5127 | list yet at this point. */ | |
5128 | ||
5129 | child_regcache | |
5130 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
5131 | gdbarch, | |
5132 | parent_inf->aspace); | |
5133 | /* Read PC value of parent process. */ | |
5134 | parent_pc = regcache_read_pc (regcache); | |
5135 | ||
5136 | if (debug_displaced) | |
5137 | fprintf_unfiltered (gdb_stdlog, | |
5138 | "displaced: write child pc from %s to %s\n", | |
5139 | paddress (gdbarch, | |
5140 | regcache_read_pc (child_regcache)), | |
5141 | paddress (gdbarch, parent_pc)); | |
5142 | ||
5143 | regcache_write_pc (child_regcache, parent_pc); | |
5144 | } | |
5145 | } | |
5146 | ||
5a2901d9 | 5147 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 5148 | context_switch (ecs->ptid); |
5a2901d9 | 5149 | |
b242c3c2 PA |
5150 | /* Immediately detach breakpoints from the child before there's |
5151 | any chance of letting the user delete breakpoints from the | |
5152 | breakpoint lists. If we don't do this early, it's easy to | |
5153 | leave left over traps in the child, vis: "break foo; catch | |
5154 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5155 | the fork on the last `continue', and by that time the | |
5156 | breakpoint at "foo" is long gone from the breakpoint table. | |
5157 | If we vforked, then we don't need to unpatch here, since both | |
5158 | parent and child are sharing the same memory pages; we'll | |
5159 | need to unpatch at follow/detach time instead to be certain | |
5160 | that new breakpoints added between catchpoint hit time and | |
5161 | vfork follow are detached. */ | |
5162 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5163 | { | |
b242c3c2 PA |
5164 | /* This won't actually modify the breakpoint list, but will |
5165 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5166 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5167 | } |
5168 | ||
34b7e8a6 | 5169 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5170 | |
e58b0e63 PA |
5171 | /* In case the event is caught by a catchpoint, remember that |
5172 | the event is to be followed at the next resume of the thread, | |
5173 | and not immediately. */ | |
5174 | ecs->event_thread->pending_follow = ecs->ws; | |
5175 | ||
fb14de7b | 5176 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 5177 | |
16c381f0 | 5178 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 5179 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 5180 | stop_pc, ecs->ptid, &ecs->ws); |
675bf4cb | 5181 | |
ce12b012 PA |
5182 | /* If no catchpoint triggered for this, then keep going. Note |
5183 | that we're interested in knowing the bpstat actually causes a | |
5184 | stop, not just if it may explain the signal. Software | |
5185 | watchpoints, for example, always appear in the bpstat. */ | |
5186 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5187 | { |
6c95b8df PA |
5188 | ptid_t parent; |
5189 | ptid_t child; | |
e58b0e63 | 5190 | int should_resume; |
3e43a32a MS |
5191 | int follow_child |
5192 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 5193 | |
a493e3e2 | 5194 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 PA |
5195 | |
5196 | should_resume = follow_fork (); | |
5197 | ||
6c95b8df PA |
5198 | parent = ecs->ptid; |
5199 | child = ecs->ws.value.related_pid; | |
5200 | ||
a2077e25 PA |
5201 | /* At this point, the parent is marked running, and the |
5202 | child is marked stopped. */ | |
5203 | ||
5204 | /* If not resuming the parent, mark it stopped. */ | |
5205 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
5206 | set_running (parent, 0); | |
5207 | ||
5208 | /* If resuming the child, mark it running. */ | |
5209 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
5210 | set_running (child, 1); | |
5211 | ||
6c95b8df | 5212 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5213 | if (!detach_fork && (non_stop |
5214 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5215 | { |
5216 | if (follow_child) | |
5217 | switch_to_thread (parent); | |
5218 | else | |
5219 | switch_to_thread (child); | |
5220 | ||
5221 | ecs->event_thread = inferior_thread (); | |
5222 | ecs->ptid = inferior_ptid; | |
5223 | keep_going (ecs); | |
5224 | } | |
5225 | ||
5226 | if (follow_child) | |
5227 | switch_to_thread (child); | |
5228 | else | |
5229 | switch_to_thread (parent); | |
5230 | ||
e58b0e63 PA |
5231 | ecs->event_thread = inferior_thread (); |
5232 | ecs->ptid = inferior_ptid; | |
5233 | ||
5234 | if (should_resume) | |
5235 | keep_going (ecs); | |
5236 | else | |
22bcd14b | 5237 | stop_waiting (ecs); |
04e68871 DJ |
5238 | return; |
5239 | } | |
94c57d6a PA |
5240 | process_event_stop_test (ecs); |
5241 | return; | |
488f131b | 5242 | |
6c95b8df PA |
5243 | case TARGET_WAITKIND_VFORK_DONE: |
5244 | /* Done with the shared memory region. Re-insert breakpoints in | |
5245 | the parent, and keep going. */ | |
5246 | ||
5247 | if (debug_infrun) | |
3e43a32a MS |
5248 | fprintf_unfiltered (gdb_stdlog, |
5249 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
6c95b8df PA |
5250 | |
5251 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5252 | context_switch (ecs->ptid); | |
5253 | ||
5254 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5255 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
6c95b8df PA |
5256 | /* This also takes care of reinserting breakpoints in the |
5257 | previously locked inferior. */ | |
5258 | keep_going (ecs); | |
5259 | return; | |
5260 | ||
488f131b | 5261 | case TARGET_WAITKIND_EXECD: |
527159b7 | 5262 | if (debug_infrun) |
fc5261f2 | 5263 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 5264 | |
5a2901d9 | 5265 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 5266 | context_switch (ecs->ptid); |
5a2901d9 | 5267 | |
fb14de7b | 5268 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
795e548f | 5269 | |
6c95b8df PA |
5270 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5271 | handle_vfork_child_exec_or_exit (1); | |
5272 | ||
795e548f PA |
5273 | /* This causes the eventpoints and symbol table to be reset. |
5274 | Must do this now, before trying to determine whether to | |
5275 | stop. */ | |
71b43ef8 | 5276 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5277 | |
17d8546e DB |
5278 | /* In follow_exec we may have deleted the original thread and |
5279 | created a new one. Make sure that the event thread is the | |
5280 | execd thread for that case (this is a nop otherwise). */ | |
5281 | ecs->event_thread = inferior_thread (); | |
5282 | ||
16c381f0 | 5283 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 5284 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 5285 | stop_pc, ecs->ptid, &ecs->ws); |
795e548f | 5286 | |
71b43ef8 PA |
5287 | /* Note that this may be referenced from inside |
5288 | bpstat_stop_status above, through inferior_has_execd. */ | |
5289 | xfree (ecs->ws.value.execd_pathname); | |
5290 | ecs->ws.value.execd_pathname = NULL; | |
5291 | ||
04e68871 | 5292 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5293 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5294 | { |
a493e3e2 | 5295 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5296 | keep_going (ecs); |
5297 | return; | |
5298 | } | |
94c57d6a PA |
5299 | process_event_stop_test (ecs); |
5300 | return; | |
488f131b | 5301 | |
b4dc5ffa MK |
5302 | /* Be careful not to try to gather much state about a thread |
5303 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5304 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 5305 | if (debug_infrun) |
3e43a32a MS |
5306 | fprintf_unfiltered (gdb_stdlog, |
5307 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
1777feb0 | 5308 | /* Getting the current syscall number. */ |
94c57d6a PA |
5309 | if (handle_syscall_event (ecs) == 0) |
5310 | process_event_stop_test (ecs); | |
5311 | return; | |
c906108c | 5312 | |
488f131b JB |
5313 | /* Before examining the threads further, step this thread to |
5314 | get it entirely out of the syscall. (We get notice of the | |
5315 | event when the thread is just on the verge of exiting a | |
5316 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5317 | into user code.) */ |
488f131b | 5318 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 5319 | if (debug_infrun) |
3e43a32a MS |
5320 | fprintf_unfiltered (gdb_stdlog, |
5321 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
94c57d6a PA |
5322 | if (handle_syscall_event (ecs) == 0) |
5323 | process_event_stop_test (ecs); | |
5324 | return; | |
c906108c | 5325 | |
488f131b | 5326 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 5327 | if (debug_infrun) |
8a9de0e4 | 5328 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
16c381f0 | 5329 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
4f5d7f63 PA |
5330 | handle_signal_stop (ecs); |
5331 | return; | |
c906108c | 5332 | |
b2175913 | 5333 | case TARGET_WAITKIND_NO_HISTORY: |
4b4e080e PA |
5334 | if (debug_infrun) |
5335 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
b2175913 | 5336 | /* Reverse execution: target ran out of history info. */ |
eab402df | 5337 | |
d1988021 MM |
5338 | /* Switch to the stopped thread. */ |
5339 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5340 | context_switch (ecs->ptid); | |
5341 | if (debug_infrun) | |
5342 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
5343 | ||
34b7e8a6 | 5344 | delete_just_stopped_threads_single_step_breakpoints (); |
d1988021 | 5345 | stop_pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); |
fd664c91 | 5346 | observer_notify_no_history (); |
22bcd14b | 5347 | stop_waiting (ecs); |
b2175913 | 5348 | return; |
488f131b | 5349 | } |
4f5d7f63 PA |
5350 | } |
5351 | ||
0b6e5e10 JB |
5352 | /* A wrapper around handle_inferior_event_1, which also makes sure |
5353 | that all temporary struct value objects that were created during | |
5354 | the handling of the event get deleted at the end. */ | |
5355 | ||
5356 | static void | |
5357 | handle_inferior_event (struct execution_control_state *ecs) | |
5358 | { | |
5359 | struct value *mark = value_mark (); | |
5360 | ||
5361 | handle_inferior_event_1 (ecs); | |
5362 | /* Purge all temporary values created during the event handling, | |
5363 | as it could be a long time before we return to the command level | |
5364 | where such values would otherwise be purged. */ | |
5365 | value_free_to_mark (mark); | |
5366 | } | |
5367 | ||
372316f1 PA |
5368 | /* Restart threads back to what they were trying to do back when we |
5369 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5370 | ignored. */ | |
4d9d9d04 PA |
5371 | |
5372 | static void | |
372316f1 PA |
5373 | restart_threads (struct thread_info *event_thread) |
5374 | { | |
5375 | struct thread_info *tp; | |
5376 | struct thread_info *step_over = NULL; | |
5377 | ||
5378 | /* In case the instruction just stepped spawned a new thread. */ | |
5379 | update_thread_list (); | |
5380 | ||
5381 | ALL_NON_EXITED_THREADS (tp) | |
5382 | { | |
5383 | if (tp == event_thread) | |
5384 | { | |
5385 | if (debug_infrun) | |
5386 | fprintf_unfiltered (gdb_stdlog, | |
5387 | "infrun: restart threads: " | |
5388 | "[%s] is event thread\n", | |
5389 | target_pid_to_str (tp->ptid)); | |
5390 | continue; | |
5391 | } | |
5392 | ||
5393 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5394 | { | |
5395 | if (debug_infrun) | |
5396 | fprintf_unfiltered (gdb_stdlog, | |
5397 | "infrun: restart threads: " | |
5398 | "[%s] not meant to be running\n", | |
5399 | target_pid_to_str (tp->ptid)); | |
5400 | continue; | |
5401 | } | |
5402 | ||
5403 | if (tp->resumed) | |
5404 | { | |
5405 | if (debug_infrun) | |
5406 | fprintf_unfiltered (gdb_stdlog, | |
5407 | "infrun: restart threads: [%s] resumed\n", | |
5408 | target_pid_to_str (tp->ptid)); | |
5409 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
5410 | continue; | |
5411 | } | |
5412 | ||
5413 | if (thread_is_in_step_over_chain (tp)) | |
5414 | { | |
5415 | if (debug_infrun) | |
5416 | fprintf_unfiltered (gdb_stdlog, | |
5417 | "infrun: restart threads: " | |
5418 | "[%s] needs step-over\n", | |
5419 | target_pid_to_str (tp->ptid)); | |
5420 | gdb_assert (!tp->resumed); | |
5421 | continue; | |
5422 | } | |
5423 | ||
5424 | ||
5425 | if (tp->suspend.waitstatus_pending_p) | |
5426 | { | |
5427 | if (debug_infrun) | |
5428 | fprintf_unfiltered (gdb_stdlog, | |
5429 | "infrun: restart threads: " | |
5430 | "[%s] has pending status\n", | |
5431 | target_pid_to_str (tp->ptid)); | |
5432 | tp->resumed = 1; | |
5433 | continue; | |
5434 | } | |
5435 | ||
5436 | /* If some thread needs to start a step-over at this point, it | |
5437 | should still be in the step-over queue, and thus skipped | |
5438 | above. */ | |
5439 | if (thread_still_needs_step_over (tp)) | |
5440 | { | |
5441 | internal_error (__FILE__, __LINE__, | |
5442 | "thread [%s] needs a step-over, but not in " | |
5443 | "step-over queue\n", | |
5444 | target_pid_to_str (tp->ptid)); | |
5445 | } | |
5446 | ||
5447 | if (currently_stepping (tp)) | |
5448 | { | |
5449 | if (debug_infrun) | |
5450 | fprintf_unfiltered (gdb_stdlog, | |
5451 | "infrun: restart threads: [%s] was stepping\n", | |
5452 | target_pid_to_str (tp->ptid)); | |
5453 | keep_going_stepped_thread (tp); | |
5454 | } | |
5455 | else | |
5456 | { | |
5457 | struct execution_control_state ecss; | |
5458 | struct execution_control_state *ecs = &ecss; | |
5459 | ||
5460 | if (debug_infrun) | |
5461 | fprintf_unfiltered (gdb_stdlog, | |
5462 | "infrun: restart threads: [%s] continuing\n", | |
5463 | target_pid_to_str (tp->ptid)); | |
5464 | reset_ecs (ecs, tp); | |
5465 | switch_to_thread (tp->ptid); | |
5466 | keep_going_pass_signal (ecs); | |
5467 | } | |
5468 | } | |
5469 | } | |
5470 | ||
5471 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5472 | a pending waitstatus. */ | |
5473 | ||
5474 | static int | |
5475 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5476 | void *arg) | |
5477 | { | |
5478 | return (tp->resumed | |
5479 | && tp->suspend.waitstatus_pending_p); | |
5480 | } | |
5481 | ||
5482 | /* Called when we get an event that may finish an in-line or | |
5483 | out-of-line (displaced stepping) step-over started previously. | |
5484 | Return true if the event is processed and we should go back to the | |
5485 | event loop; false if the caller should continue processing the | |
5486 | event. */ | |
5487 | ||
5488 | static int | |
4d9d9d04 PA |
5489 | finish_step_over (struct execution_control_state *ecs) |
5490 | { | |
372316f1 PA |
5491 | int had_step_over_info; |
5492 | ||
4d9d9d04 PA |
5493 | displaced_step_fixup (ecs->ptid, |
5494 | ecs->event_thread->suspend.stop_signal); | |
5495 | ||
372316f1 PA |
5496 | had_step_over_info = step_over_info_valid_p (); |
5497 | ||
5498 | if (had_step_over_info) | |
4d9d9d04 PA |
5499 | { |
5500 | /* If we're stepping over a breakpoint with all threads locked, | |
5501 | then only the thread that was stepped should be reporting | |
5502 | back an event. */ | |
5503 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5504 | ||
5505 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5506 | clear_step_over_info (); | |
5507 | } | |
5508 | ||
fbea99ea | 5509 | if (!target_is_non_stop_p ()) |
372316f1 | 5510 | return 0; |
4d9d9d04 PA |
5511 | |
5512 | /* Start a new step-over in another thread if there's one that | |
5513 | needs it. */ | |
5514 | start_step_over (); | |
372316f1 PA |
5515 | |
5516 | /* If we were stepping over a breakpoint before, and haven't started | |
5517 | a new in-line step-over sequence, then restart all other threads | |
5518 | (except the event thread). We can't do this in all-stop, as then | |
5519 | e.g., we wouldn't be able to issue any other remote packet until | |
5520 | these other threads stop. */ | |
5521 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5522 | { | |
5523 | struct thread_info *pending; | |
5524 | ||
5525 | /* If we only have threads with pending statuses, the restart | |
5526 | below won't restart any thread and so nothing re-inserts the | |
5527 | breakpoint we just stepped over. But we need it inserted | |
5528 | when we later process the pending events, otherwise if | |
5529 | another thread has a pending event for this breakpoint too, | |
5530 | we'd discard its event (because the breakpoint that | |
5531 | originally caused the event was no longer inserted). */ | |
5532 | context_switch (ecs->ptid); | |
5533 | insert_breakpoints (); | |
5534 | ||
5535 | restart_threads (ecs->event_thread); | |
5536 | ||
5537 | /* If we have events pending, go through handle_inferior_event | |
5538 | again, picking up a pending event at random. This avoids | |
5539 | thread starvation. */ | |
5540 | ||
5541 | /* But not if we just stepped over a watchpoint in order to let | |
5542 | the instruction execute so we can evaluate its expression. | |
5543 | The set of watchpoints that triggered is recorded in the | |
5544 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5545 | If we processed another event first, that other event could | |
5546 | clobber this info. */ | |
5547 | if (ecs->event_thread->stepping_over_watchpoint) | |
5548 | return 0; | |
5549 | ||
5550 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5551 | NULL); | |
5552 | if (pending != NULL) | |
5553 | { | |
5554 | struct thread_info *tp = ecs->event_thread; | |
5555 | struct regcache *regcache; | |
5556 | ||
5557 | if (debug_infrun) | |
5558 | { | |
5559 | fprintf_unfiltered (gdb_stdlog, | |
5560 | "infrun: found resumed threads with " | |
5561 | "pending events, saving status\n"); | |
5562 | } | |
5563 | ||
5564 | gdb_assert (pending != tp); | |
5565 | ||
5566 | /* Record the event thread's event for later. */ | |
5567 | save_waitstatus (tp, &ecs->ws); | |
5568 | /* This was cleared early, by handle_inferior_event. Set it | |
5569 | so this pending event is considered by | |
5570 | do_target_wait. */ | |
5571 | tp->resumed = 1; | |
5572 | ||
5573 | gdb_assert (!tp->executing); | |
5574 | ||
5575 | regcache = get_thread_regcache (tp->ptid); | |
5576 | tp->suspend.stop_pc = regcache_read_pc (regcache); | |
5577 | ||
5578 | if (debug_infrun) | |
5579 | { | |
5580 | fprintf_unfiltered (gdb_stdlog, | |
5581 | "infrun: saved stop_pc=%s for %s " | |
5582 | "(currently_stepping=%d)\n", | |
5583 | paddress (target_gdbarch (), | |
5584 | tp->suspend.stop_pc), | |
5585 | target_pid_to_str (tp->ptid), | |
5586 | currently_stepping (tp)); | |
5587 | } | |
5588 | ||
5589 | /* This in-line step-over finished; clear this so we won't | |
5590 | start a new one. This is what handle_signal_stop would | |
5591 | do, if we returned false. */ | |
5592 | tp->stepping_over_breakpoint = 0; | |
5593 | ||
5594 | /* Wake up the event loop again. */ | |
5595 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5596 | ||
5597 | prepare_to_wait (ecs); | |
5598 | return 1; | |
5599 | } | |
5600 | } | |
5601 | ||
5602 | return 0; | |
4d9d9d04 PA |
5603 | } |
5604 | ||
4f5d7f63 PA |
5605 | /* Come here when the program has stopped with a signal. */ |
5606 | ||
5607 | static void | |
5608 | handle_signal_stop (struct execution_control_state *ecs) | |
5609 | { | |
5610 | struct frame_info *frame; | |
5611 | struct gdbarch *gdbarch; | |
5612 | int stopped_by_watchpoint; | |
5613 | enum stop_kind stop_soon; | |
5614 | int random_signal; | |
c906108c | 5615 | |
f0407826 DE |
5616 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5617 | ||
5618 | /* Do we need to clean up the state of a thread that has | |
5619 | completed a displaced single-step? (Doing so usually affects | |
5620 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5621 | if (finish_step_over (ecs)) |
5622 | return; | |
f0407826 DE |
5623 | |
5624 | /* If we either finished a single-step or hit a breakpoint, but | |
5625 | the user wanted this thread to be stopped, pretend we got a | |
5626 | SIG0 (generic unsignaled stop). */ | |
5627 | if (ecs->event_thread->stop_requested | |
5628 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5629 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5630 | |
515630c5 | 5631 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 5632 | |
527159b7 | 5633 | if (debug_infrun) |
237fc4c9 | 5634 | { |
5af949e3 UW |
5635 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
5636 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7f82dfc7 JK |
5637 | struct cleanup *old_chain = save_inferior_ptid (); |
5638 | ||
5639 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
5640 | |
5641 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
5642 | paddress (gdbarch, stop_pc)); | |
d92524f1 | 5643 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5644 | { |
5645 | CORE_ADDR addr; | |
abbb1732 | 5646 | |
237fc4c9 PA |
5647 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
5648 | ||
5649 | if (target_stopped_data_address (¤t_target, &addr)) | |
5650 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5651 | "infrun: stopped data address = %s\n", |
5652 | paddress (gdbarch, addr)); | |
237fc4c9 PA |
5653 | else |
5654 | fprintf_unfiltered (gdb_stdlog, | |
5655 | "infrun: (no data address available)\n"); | |
5656 | } | |
7f82dfc7 JK |
5657 | |
5658 | do_cleanups (old_chain); | |
237fc4c9 | 5659 | } |
527159b7 | 5660 | |
36fa8042 PA |
5661 | /* This is originated from start_remote(), start_inferior() and |
5662 | shared libraries hook functions. */ | |
5663 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
5664 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) | |
5665 | { | |
5666 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5667 | context_switch (ecs->ptid); | |
5668 | if (debug_infrun) | |
5669 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
5670 | stop_print_frame = 1; | |
22bcd14b | 5671 | stop_waiting (ecs); |
36fa8042 PA |
5672 | return; |
5673 | } | |
5674 | ||
36fa8042 PA |
5675 | /* This originates from attach_command(). We need to overwrite |
5676 | the stop_signal here, because some kernels don't ignore a | |
5677 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5678 | See more comments in inferior.h. On the other hand, if we | |
5679 | get a non-SIGSTOP, report it to the user - assume the backend | |
5680 | will handle the SIGSTOP if it should show up later. | |
5681 | ||
5682 | Also consider that the attach is complete when we see a | |
5683 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5684 | target extended-remote report it instead of a SIGSTOP | |
5685 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5686 | signal, so this is no exception. | |
5687 | ||
5688 | Also consider that the attach is complete when we see a | |
5689 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5690 | the target to stop all threads of the inferior, in case the | |
5691 | low level attach operation doesn't stop them implicitly. If | |
5692 | they weren't stopped implicitly, then the stub will report a | |
5693 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5694 | other than GDB's request. */ | |
5695 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5696 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5697 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5698 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5699 | { | |
5700 | stop_print_frame = 1; | |
22bcd14b | 5701 | stop_waiting (ecs); |
36fa8042 PA |
5702 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5703 | return; | |
5704 | } | |
5705 | ||
488f131b | 5706 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
5707 | so, then switch to that thread. */ |
5708 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 5709 | { |
527159b7 | 5710 | if (debug_infrun) |
8a9de0e4 | 5711 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 5712 | |
0d1e5fa7 | 5713 | context_switch (ecs->ptid); |
c5aa993b | 5714 | |
9a4105ab | 5715 | if (deprecated_context_hook) |
5d5658a1 | 5716 | deprecated_context_hook (ptid_to_global_thread_id (ecs->ptid)); |
488f131b | 5717 | } |
c906108c | 5718 | |
568d6575 UW |
5719 | /* At this point, get hold of the now-current thread's frame. */ |
5720 | frame = get_current_frame (); | |
5721 | gdbarch = get_frame_arch (frame); | |
5722 | ||
2adfaa28 | 5723 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5724 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5725 | { |
af48d08f PA |
5726 | struct regcache *regcache; |
5727 | struct address_space *aspace; | |
5728 | CORE_ADDR pc; | |
2adfaa28 | 5729 | |
af48d08f PA |
5730 | regcache = get_thread_regcache (ecs->ptid); |
5731 | aspace = get_regcache_aspace (regcache); | |
5732 | pc = regcache_read_pc (regcache); | |
34b7e8a6 | 5733 | |
af48d08f PA |
5734 | /* However, before doing so, if this single-step breakpoint was |
5735 | actually for another thread, set this thread up for moving | |
5736 | past it. */ | |
5737 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5738 | aspace, pc)) | |
5739 | { | |
5740 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
5741 | { |
5742 | if (debug_infrun) | |
5743 | { | |
5744 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 5745 | "infrun: [%s] hit another thread's " |
34b7e8a6 PA |
5746 | "single-step breakpoint\n", |
5747 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 | 5748 | } |
af48d08f PA |
5749 | ecs->hit_singlestep_breakpoint = 1; |
5750 | } | |
5751 | } | |
5752 | else | |
5753 | { | |
5754 | if (debug_infrun) | |
5755 | { | |
5756 | fprintf_unfiltered (gdb_stdlog, | |
5757 | "infrun: [%s] hit its " | |
5758 | "single-step breakpoint\n", | |
5759 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 PA |
5760 | } |
5761 | } | |
488f131b | 5762 | } |
af48d08f | 5763 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5764 | |
963f9c80 PA |
5765 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5766 | && ecs->event_thread->control.trap_expected | |
5767 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5768 | stopped_by_watchpoint = 0; |
5769 | else | |
5770 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5771 | ||
5772 | /* If necessary, step over this watchpoint. We'll be back to display | |
5773 | it in a moment. */ | |
5774 | if (stopped_by_watchpoint | |
d92524f1 | 5775 | && (target_have_steppable_watchpoint |
568d6575 | 5776 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5777 | { |
488f131b JB |
5778 | /* At this point, we are stopped at an instruction which has |
5779 | attempted to write to a piece of memory under control of | |
5780 | a watchpoint. The instruction hasn't actually executed | |
5781 | yet. If we were to evaluate the watchpoint expression | |
5782 | now, we would get the old value, and therefore no change | |
5783 | would seem to have occurred. | |
5784 | ||
5785 | In order to make watchpoints work `right', we really need | |
5786 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5787 | watchpoint expression. We do this by single-stepping the |
5788 | target. | |
5789 | ||
7f89fd65 | 5790 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5791 | it. For example, the PA can (with some kernel cooperation) |
5792 | single step over a watchpoint without disabling the watchpoint. | |
5793 | ||
5794 | It is far more common to need to disable a watchpoint to step | |
5795 | the inferior over it. If we have non-steppable watchpoints, | |
5796 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5797 | disable all watchpoints. |
5798 | ||
5799 | Any breakpoint at PC must also be stepped over -- if there's | |
5800 | one, it will have already triggered before the watchpoint | |
5801 | triggered, and we either already reported it to the user, or | |
5802 | it didn't cause a stop and we called keep_going. In either | |
5803 | case, if there was a breakpoint at PC, we must be trying to | |
5804 | step past it. */ | |
5805 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5806 | keep_going (ecs); | |
488f131b JB |
5807 | return; |
5808 | } | |
5809 | ||
4e1c45ea | 5810 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5811 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5812 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5813 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5814 | stop_print_frame = 1; |
488f131b | 5815 | stopped_by_random_signal = 0; |
488f131b | 5816 | |
edb3359d DJ |
5817 | /* Hide inlined functions starting here, unless we just performed stepi or |
5818 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5819 | inline function call sites). */ | |
16c381f0 | 5820 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f GB |
5821 | { |
5822 | struct address_space *aspace = | |
5823 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
5824 | ||
5825 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5826 | determine that the address is one where functions cannot have | |
5827 | been inlined. This improves performance with inferiors that | |
5828 | load a lot of shared libraries, because the solib event | |
5829 | breakpoint is defined as the address of a function (i.e. not | |
5830 | inline). Note that we have to check the previous PC as well | |
5831 | as the current one to catch cases when we have just | |
5832 | single-stepped off a breakpoint prior to reinstating it. | |
5833 | Note that we're assuming that the code we single-step to is | |
5834 | not inline, but that's not definitive: there's nothing | |
5835 | preventing the event breakpoint function from containing | |
5836 | inlined code, and the single-step ending up there. If the | |
5837 | user had set a breakpoint on that inlined code, the missing | |
5838 | skip_inline_frames call would break things. Fortunately | |
5839 | that's an extremely unlikely scenario. */ | |
09ac7c10 | 5840 | if (!pc_at_non_inline_function (aspace, stop_pc, &ecs->ws) |
a210c238 MR |
5841 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5842 | && ecs->event_thread->control.trap_expected | |
5843 | && pc_at_non_inline_function (aspace, | |
5844 | ecs->event_thread->prev_pc, | |
09ac7c10 | 5845 | &ecs->ws))) |
1c5a993e MR |
5846 | { |
5847 | skip_inline_frames (ecs->ptid); | |
5848 | ||
5849 | /* Re-fetch current thread's frame in case that invalidated | |
5850 | the frame cache. */ | |
5851 | frame = get_current_frame (); | |
5852 | gdbarch = get_frame_arch (frame); | |
5853 | } | |
0574c78f | 5854 | } |
edb3359d | 5855 | |
a493e3e2 | 5856 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 5857 | && ecs->event_thread->control.trap_expected |
568d6575 | 5858 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 5859 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 5860 | { |
b50d7442 | 5861 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 5862 | also on an instruction that needs to be stepped multiple |
1777feb0 | 5863 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
5864 | with a delay slot. It needs to be stepped twice, once for |
5865 | the instruction and once for the delay slot. */ | |
5866 | int step_through_delay | |
568d6575 | 5867 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 5868 | |
527159b7 | 5869 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 5870 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
5871 | if (ecs->event_thread->control.step_range_end == 0 |
5872 | && step_through_delay) | |
3352ef37 AC |
5873 | { |
5874 | /* The user issued a continue when stopped at a breakpoint. | |
5875 | Set up for another trap and get out of here. */ | |
4e1c45ea | 5876 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5877 | keep_going (ecs); |
5878 | return; | |
5879 | } | |
5880 | else if (step_through_delay) | |
5881 | { | |
5882 | /* The user issued a step when stopped at a breakpoint. | |
5883 | Maybe we should stop, maybe we should not - the delay | |
5884 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
5885 | case, don't decide that here, just set |
5886 | ecs->stepping_over_breakpoint, making sure we | |
5887 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 5888 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5889 | } |
5890 | } | |
5891 | ||
ab04a2af TT |
5892 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
5893 | handles this event. */ | |
5894 | ecs->event_thread->control.stop_bpstat | |
5895 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
5896 | stop_pc, ecs->ptid, &ecs->ws); | |
db82e815 | 5897 | |
ab04a2af TT |
5898 | /* Following in case break condition called a |
5899 | function. */ | |
5900 | stop_print_frame = 1; | |
73dd234f | 5901 | |
ab04a2af TT |
5902 | /* This is where we handle "moribund" watchpoints. Unlike |
5903 | software breakpoints traps, hardware watchpoint traps are | |
5904 | always distinguishable from random traps. If no high-level | |
5905 | watchpoint is associated with the reported stop data address | |
5906 | anymore, then the bpstat does not explain the signal --- | |
5907 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
5908 | set. */ | |
5909 | ||
5910 | if (debug_infrun | |
5911 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 5912 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 5913 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
5914 | && stopped_by_watchpoint) |
5915 | fprintf_unfiltered (gdb_stdlog, | |
5916 | "infrun: no user watchpoint explains " | |
5917 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 5918 | |
bac7d97b | 5919 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
5920 | at one stage in the past included checks for an inferior |
5921 | function call's call dummy's return breakpoint. The original | |
5922 | comment, that went with the test, read: | |
03cebad2 | 5923 | |
ab04a2af TT |
5924 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
5925 | another signal besides SIGTRAP, so check here as well as | |
5926 | above.'' | |
73dd234f | 5927 | |
ab04a2af TT |
5928 | If someone ever tries to get call dummys on a |
5929 | non-executable stack to work (where the target would stop | |
5930 | with something like a SIGSEGV), then those tests might need | |
5931 | to be re-instated. Given, however, that the tests were only | |
5932 | enabled when momentary breakpoints were not being used, I | |
5933 | suspect that it won't be the case. | |
488f131b | 5934 | |
ab04a2af TT |
5935 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
5936 | be necessary for call dummies on a non-executable stack on | |
5937 | SPARC. */ | |
488f131b | 5938 | |
bac7d97b | 5939 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
5940 | random_signal |
5941 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
5942 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 5943 | |
1cf4d951 PA |
5944 | /* Maybe this was a trap for a software breakpoint that has since |
5945 | been removed. */ | |
5946 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
5947 | { | |
5948 | if (program_breakpoint_here_p (gdbarch, stop_pc)) | |
5949 | { | |
5950 | struct regcache *regcache; | |
5951 | int decr_pc; | |
5952 | ||
5953 | /* Re-adjust PC to what the program would see if GDB was not | |
5954 | debugging it. */ | |
5955 | regcache = get_thread_regcache (ecs->event_thread->ptid); | |
527a273a | 5956 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
5957 | if (decr_pc != 0) |
5958 | { | |
5959 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); | |
5960 | ||
5961 | if (record_full_is_used ()) | |
5962 | record_full_gdb_operation_disable_set (); | |
5963 | ||
5964 | regcache_write_pc (regcache, stop_pc + decr_pc); | |
5965 | ||
5966 | do_cleanups (old_cleanups); | |
5967 | } | |
5968 | } | |
5969 | else | |
5970 | { | |
5971 | /* A delayed software breakpoint event. Ignore the trap. */ | |
5972 | if (debug_infrun) | |
5973 | fprintf_unfiltered (gdb_stdlog, | |
5974 | "infrun: delayed software breakpoint " | |
5975 | "trap, ignoring\n"); | |
5976 | random_signal = 0; | |
5977 | } | |
5978 | } | |
5979 | ||
5980 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
5981 | has since been removed. */ | |
5982 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
5983 | { | |
5984 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
5985 | if (debug_infrun) | |
5986 | fprintf_unfiltered (gdb_stdlog, | |
5987 | "infrun: delayed hardware breakpoint/watchpoint " | |
5988 | "trap, ignoring\n"); | |
5989 | random_signal = 0; | |
5990 | } | |
5991 | ||
bac7d97b PA |
5992 | /* If not, perhaps stepping/nexting can. */ |
5993 | if (random_signal) | |
5994 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5995 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 5996 | |
2adfaa28 PA |
5997 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
5998 | thread. Single-step breakpoints are transparent to the | |
5999 | breakpoints module. */ | |
6000 | if (random_signal) | |
6001 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6002 | ||
bac7d97b PA |
6003 | /* No? Perhaps we got a moribund watchpoint. */ |
6004 | if (random_signal) | |
6005 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6006 | |
488f131b JB |
6007 | /* For the program's own signals, act according to |
6008 | the signal handling tables. */ | |
6009 | ||
ce12b012 | 6010 | if (random_signal) |
488f131b JB |
6011 | { |
6012 | /* Signal not for debugging purposes. */ | |
c9657e70 | 6013 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
c9737c08 | 6014 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6015 | |
527159b7 | 6016 | if (debug_infrun) |
c9737c08 PA |
6017 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
6018 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6019 | |
488f131b JB |
6020 | stopped_by_random_signal = 1; |
6021 | ||
252fbfc8 PA |
6022 | /* Always stop on signals if we're either just gaining control |
6023 | of the program, or the user explicitly requested this thread | |
6024 | to remain stopped. */ | |
d6b48e9c | 6025 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6026 | || ecs->event_thread->stop_requested |
24291992 | 6027 | || (!inf->detaching |
16c381f0 | 6028 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 6029 | { |
22bcd14b | 6030 | stop_waiting (ecs); |
488f131b JB |
6031 | return; |
6032 | } | |
b57bacec PA |
6033 | |
6034 | /* Notify observers the signal has "handle print" set. Note we | |
6035 | returned early above if stopping; normal_stop handles the | |
6036 | printing in that case. */ | |
6037 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6038 | { | |
6039 | /* The signal table tells us to print about this signal. */ | |
6040 | target_terminal_ours_for_output (); | |
6041 | observer_notify_signal_received (ecs->event_thread->suspend.stop_signal); | |
6042 | target_terminal_inferior (); | |
6043 | } | |
488f131b JB |
6044 | |
6045 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6046 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6047 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6048 | |
fb14de7b | 6049 | if (ecs->event_thread->prev_pc == stop_pc |
16c381f0 | 6050 | && ecs->event_thread->control.trap_expected |
8358c15c | 6051 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 | 6052 | { |
372316f1 PA |
6053 | int was_in_line; |
6054 | ||
68f53502 AC |
6055 | /* We were just starting a new sequence, attempting to |
6056 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6057 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6058 | of the stepping range so GDB needs to remember to, when |
6059 | the signal handler returns, resume stepping off that | |
6060 | breakpoint. */ | |
6061 | /* To simplify things, "continue" is forced to use the same | |
6062 | code paths as single-step - set a breakpoint at the | |
6063 | signal return address and then, once hit, step off that | |
6064 | breakpoint. */ | |
237fc4c9 PA |
6065 | if (debug_infrun) |
6066 | fprintf_unfiltered (gdb_stdlog, | |
6067 | "infrun: signal arrived while stepping over " | |
6068 | "breakpoint\n"); | |
d3169d93 | 6069 | |
372316f1 PA |
6070 | was_in_line = step_over_info_valid_p (); |
6071 | clear_step_over_info (); | |
2c03e5be | 6072 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6073 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6074 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6075 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc | 6076 | |
fbea99ea | 6077 | if (target_is_non_stop_p ()) |
372316f1 | 6078 | { |
fbea99ea PA |
6079 | /* Either "set non-stop" is "on", or the target is |
6080 | always in non-stop mode. In this case, we have a bit | |
6081 | more work to do. Resume the current thread, and if | |
6082 | we had paused all threads, restart them while the | |
6083 | signal handler runs. */ | |
372316f1 PA |
6084 | keep_going (ecs); |
6085 | ||
372316f1 PA |
6086 | if (was_in_line) |
6087 | { | |
372316f1 PA |
6088 | restart_threads (ecs->event_thread); |
6089 | } | |
6090 | else if (debug_infrun) | |
6091 | { | |
6092 | fprintf_unfiltered (gdb_stdlog, | |
6093 | "infrun: no need to restart threads\n"); | |
6094 | } | |
6095 | return; | |
6096 | } | |
6097 | ||
d137e6dc PA |
6098 | /* If we were nexting/stepping some other thread, switch to |
6099 | it, so that we don't continue it, losing control. */ | |
6100 | if (!switch_back_to_stepped_thread (ecs)) | |
6101 | keep_going (ecs); | |
9d799f85 | 6102 | return; |
68f53502 | 6103 | } |
9d799f85 | 6104 | |
e5f8a7cc PA |
6105 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
6106 | && (pc_in_thread_step_range (stop_pc, ecs->event_thread) | |
6107 | || ecs->event_thread->control.step_range_end == 1) | |
edb3359d | 6108 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6109 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6110 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6111 | { |
6112 | /* The inferior is about to take a signal that will take it | |
6113 | out of the single step range. Set a breakpoint at the | |
6114 | current PC (which is presumably where the signal handler | |
6115 | will eventually return) and then allow the inferior to | |
6116 | run free. | |
6117 | ||
6118 | Note that this is only needed for a signal delivered | |
6119 | while in the single-step range. Nested signals aren't a | |
6120 | problem as they eventually all return. */ | |
237fc4c9 PA |
6121 | if (debug_infrun) |
6122 | fprintf_unfiltered (gdb_stdlog, | |
6123 | "infrun: signal may take us out of " | |
6124 | "single-step range\n"); | |
6125 | ||
372316f1 | 6126 | clear_step_over_info (); |
2c03e5be | 6127 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6128 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6129 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6130 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6131 | keep_going (ecs); |
6132 | return; | |
d303a6c7 | 6133 | } |
9d799f85 AC |
6134 | |
6135 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
6136 | when either there's a nested signal, or when there's a | |
6137 | pending signal enabled just as the signal handler returns | |
6138 | (leaving the inferior at the step-resume-breakpoint without | |
6139 | actually executing it). Either way continue until the | |
6140 | breakpoint is really hit. */ | |
c447ac0b PA |
6141 | |
6142 | if (!switch_back_to_stepped_thread (ecs)) | |
6143 | { | |
6144 | if (debug_infrun) | |
6145 | fprintf_unfiltered (gdb_stdlog, | |
6146 | "infrun: random signal, keep going\n"); | |
6147 | ||
6148 | keep_going (ecs); | |
6149 | } | |
6150 | return; | |
488f131b | 6151 | } |
94c57d6a PA |
6152 | |
6153 | process_event_stop_test (ecs); | |
6154 | } | |
6155 | ||
6156 | /* Come here when we've got some debug event / signal we can explain | |
6157 | (IOW, not a random signal), and test whether it should cause a | |
6158 | stop, or whether we should resume the inferior (transparently). | |
6159 | E.g., could be a breakpoint whose condition evaluates false; we | |
6160 | could be still stepping within the line; etc. */ | |
6161 | ||
6162 | static void | |
6163 | process_event_stop_test (struct execution_control_state *ecs) | |
6164 | { | |
6165 | struct symtab_and_line stop_pc_sal; | |
6166 | struct frame_info *frame; | |
6167 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6168 | CORE_ADDR jmp_buf_pc; |
6169 | struct bpstat_what what; | |
94c57d6a | 6170 | |
cdaa5b73 | 6171 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6172 | |
cdaa5b73 PA |
6173 | frame = get_current_frame (); |
6174 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6175 | |
cdaa5b73 | 6176 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6177 | |
cdaa5b73 PA |
6178 | if (what.call_dummy) |
6179 | { | |
6180 | stop_stack_dummy = what.call_dummy; | |
6181 | } | |
186c406b | 6182 | |
243a9253 PA |
6183 | /* A few breakpoint types have callbacks associated (e.g., |
6184 | bp_jit_event). Run them now. */ | |
6185 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6186 | ||
cdaa5b73 PA |
6187 | /* If we hit an internal event that triggers symbol changes, the |
6188 | current frame will be invalidated within bpstat_what (e.g., if we | |
6189 | hit an internal solib event). Re-fetch it. */ | |
6190 | frame = get_current_frame (); | |
6191 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6192 | |
cdaa5b73 PA |
6193 | switch (what.main_action) |
6194 | { | |
6195 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6196 | /* If we hit the breakpoint at longjmp while stepping, we | |
6197 | install a momentary breakpoint at the target of the | |
6198 | jmp_buf. */ | |
186c406b | 6199 | |
cdaa5b73 PA |
6200 | if (debug_infrun) |
6201 | fprintf_unfiltered (gdb_stdlog, | |
6202 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 6203 | |
cdaa5b73 | 6204 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6205 | |
cdaa5b73 PA |
6206 | if (what.is_longjmp) |
6207 | { | |
6208 | struct value *arg_value; | |
6209 | ||
6210 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6211 | then use it to extract the arguments. The destination PC | |
6212 | is the third argument to the probe. */ | |
6213 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6214 | if (arg_value) | |
8fa0c4f8 AA |
6215 | { |
6216 | jmp_buf_pc = value_as_address (arg_value); | |
6217 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6218 | } | |
cdaa5b73 PA |
6219 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6220 | || !gdbarch_get_longjmp_target (gdbarch, | |
6221 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6222 | { |
cdaa5b73 PA |
6223 | if (debug_infrun) |
6224 | fprintf_unfiltered (gdb_stdlog, | |
6225 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
6226 | "(!gdbarch_get_longjmp_target)\n"); | |
6227 | keep_going (ecs); | |
6228 | return; | |
e2e4d78b | 6229 | } |
e2e4d78b | 6230 | |
cdaa5b73 PA |
6231 | /* Insert a breakpoint at resume address. */ |
6232 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6233 | } | |
6234 | else | |
6235 | check_exception_resume (ecs, frame); | |
6236 | keep_going (ecs); | |
6237 | return; | |
e81a37f7 | 6238 | |
cdaa5b73 PA |
6239 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6240 | { | |
6241 | struct frame_info *init_frame; | |
e81a37f7 | 6242 | |
cdaa5b73 | 6243 | /* There are several cases to consider. |
c906108c | 6244 | |
cdaa5b73 PA |
6245 | 1. The initiating frame no longer exists. In this case we |
6246 | must stop, because the exception or longjmp has gone too | |
6247 | far. | |
2c03e5be | 6248 | |
cdaa5b73 PA |
6249 | 2. The initiating frame exists, and is the same as the |
6250 | current frame. We stop, because the exception or longjmp | |
6251 | has been caught. | |
2c03e5be | 6252 | |
cdaa5b73 PA |
6253 | 3. The initiating frame exists and is different from the |
6254 | current frame. This means the exception or longjmp has | |
6255 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6256 | |
cdaa5b73 PA |
6257 | 4. longjmp breakpoint has been placed just to protect |
6258 | against stale dummy frames and user is not interested in | |
6259 | stopping around longjmps. */ | |
c5aa993b | 6260 | |
cdaa5b73 PA |
6261 | if (debug_infrun) |
6262 | fprintf_unfiltered (gdb_stdlog, | |
6263 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 6264 | |
cdaa5b73 PA |
6265 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6266 | != NULL); | |
6267 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6268 | |
cdaa5b73 PA |
6269 | if (what.is_longjmp) |
6270 | { | |
b67a2c6f | 6271 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6272 | |
cdaa5b73 | 6273 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6274 | { |
cdaa5b73 PA |
6275 | /* Case 4. */ |
6276 | keep_going (ecs); | |
6277 | return; | |
e5ef252a | 6278 | } |
cdaa5b73 | 6279 | } |
c5aa993b | 6280 | |
cdaa5b73 | 6281 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6282 | |
cdaa5b73 PA |
6283 | if (init_frame) |
6284 | { | |
6285 | struct frame_id current_id | |
6286 | = get_frame_id (get_current_frame ()); | |
6287 | if (frame_id_eq (current_id, | |
6288 | ecs->event_thread->initiating_frame)) | |
6289 | { | |
6290 | /* Case 2. Fall through. */ | |
6291 | } | |
6292 | else | |
6293 | { | |
6294 | /* Case 3. */ | |
6295 | keep_going (ecs); | |
6296 | return; | |
6297 | } | |
68f53502 | 6298 | } |
488f131b | 6299 | |
cdaa5b73 PA |
6300 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6301 | exists. */ | |
6302 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6303 | |
bdc36728 | 6304 | end_stepping_range (ecs); |
cdaa5b73 PA |
6305 | } |
6306 | return; | |
e5ef252a | 6307 | |
cdaa5b73 PA |
6308 | case BPSTAT_WHAT_SINGLE: |
6309 | if (debug_infrun) | |
6310 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
6311 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6312 | /* Still need to check other stuff, at least the case where we | |
6313 | are stepping and step out of the right range. */ | |
6314 | break; | |
e5ef252a | 6315 | |
cdaa5b73 PA |
6316 | case BPSTAT_WHAT_STEP_RESUME: |
6317 | if (debug_infrun) | |
6318 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 6319 | |
cdaa5b73 PA |
6320 | delete_step_resume_breakpoint (ecs->event_thread); |
6321 | if (ecs->event_thread->control.proceed_to_finish | |
6322 | && execution_direction == EXEC_REVERSE) | |
6323 | { | |
6324 | struct thread_info *tp = ecs->event_thread; | |
6325 | ||
6326 | /* We are finishing a function in reverse, and just hit the | |
6327 | step-resume breakpoint at the start address of the | |
6328 | function, and we're almost there -- just need to back up | |
6329 | by one more single-step, which should take us back to the | |
6330 | function call. */ | |
6331 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6332 | keep_going (ecs); | |
e5ef252a | 6333 | return; |
cdaa5b73 PA |
6334 | } |
6335 | fill_in_stop_func (gdbarch, ecs); | |
6336 | if (stop_pc == ecs->stop_func_start | |
6337 | && execution_direction == EXEC_REVERSE) | |
6338 | { | |
6339 | /* We are stepping over a function call in reverse, and just | |
6340 | hit the step-resume breakpoint at the start address of | |
6341 | the function. Go back to single-stepping, which should | |
6342 | take us back to the function call. */ | |
6343 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6344 | keep_going (ecs); | |
6345 | return; | |
6346 | } | |
6347 | break; | |
e5ef252a | 6348 | |
cdaa5b73 PA |
6349 | case BPSTAT_WHAT_STOP_NOISY: |
6350 | if (debug_infrun) | |
6351 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
6352 | stop_print_frame = 1; | |
e5ef252a | 6353 | |
99619bea PA |
6354 | /* Assume the thread stopped for a breapoint. We'll still check |
6355 | whether a/the breakpoint is there when the thread is next | |
6356 | resumed. */ | |
6357 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6358 | |
22bcd14b | 6359 | stop_waiting (ecs); |
cdaa5b73 | 6360 | return; |
e5ef252a | 6361 | |
cdaa5b73 PA |
6362 | case BPSTAT_WHAT_STOP_SILENT: |
6363 | if (debug_infrun) | |
6364 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
6365 | stop_print_frame = 0; | |
e5ef252a | 6366 | |
99619bea PA |
6367 | /* Assume the thread stopped for a breapoint. We'll still check |
6368 | whether a/the breakpoint is there when the thread is next | |
6369 | resumed. */ | |
6370 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6371 | stop_waiting (ecs); |
cdaa5b73 PA |
6372 | return; |
6373 | ||
6374 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
6375 | if (debug_infrun) | |
6376 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
6377 | ||
6378 | delete_step_resume_breakpoint (ecs->event_thread); | |
6379 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6380 | { | |
6381 | /* Back when the step-resume breakpoint was inserted, we | |
6382 | were trying to single-step off a breakpoint. Go back to | |
6383 | doing that. */ | |
6384 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6385 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6386 | keep_going (ecs); | |
6387 | return; | |
e5ef252a | 6388 | } |
cdaa5b73 PA |
6389 | break; |
6390 | ||
6391 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6392 | break; | |
e5ef252a | 6393 | } |
c906108c | 6394 | |
af48d08f PA |
6395 | /* If we stepped a permanent breakpoint and we had a high priority |
6396 | step-resume breakpoint for the address we stepped, but we didn't | |
6397 | hit it, then we must have stepped into the signal handler. The | |
6398 | step-resume was only necessary to catch the case of _not_ | |
6399 | stepping into the handler, so delete it, and fall through to | |
6400 | checking whether the step finished. */ | |
6401 | if (ecs->event_thread->stepped_breakpoint) | |
6402 | { | |
6403 | struct breakpoint *sr_bp | |
6404 | = ecs->event_thread->control.step_resume_breakpoint; | |
6405 | ||
8d707a12 PA |
6406 | if (sr_bp != NULL |
6407 | && sr_bp->loc->permanent | |
af48d08f PA |
6408 | && sr_bp->type == bp_hp_step_resume |
6409 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6410 | { | |
6411 | if (debug_infrun) | |
6412 | fprintf_unfiltered (gdb_stdlog, | |
6413 | "infrun: stepped permanent breakpoint, stopped in " | |
6414 | "handler\n"); | |
6415 | delete_step_resume_breakpoint (ecs->event_thread); | |
6416 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6417 | } | |
6418 | } | |
6419 | ||
cdaa5b73 PA |
6420 | /* We come here if we hit a breakpoint but should not stop for it. |
6421 | Possibly we also were stepping and should stop for that. So fall | |
6422 | through and test for stepping. But, if not stepping, do not | |
6423 | stop. */ | |
c906108c | 6424 | |
a7212384 UW |
6425 | /* In all-stop mode, if we're currently stepping but have stopped in |
6426 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6427 | if (switch_back_to_stepped_thread (ecs)) |
6428 | return; | |
776f04fa | 6429 | |
8358c15c | 6430 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6431 | { |
527159b7 | 6432 | if (debug_infrun) |
d3169d93 DJ |
6433 | fprintf_unfiltered (gdb_stdlog, |
6434 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 6435 | |
488f131b JB |
6436 | /* Having a step-resume breakpoint overrides anything |
6437 | else having to do with stepping commands until | |
6438 | that breakpoint is reached. */ | |
488f131b JB |
6439 | keep_going (ecs); |
6440 | return; | |
6441 | } | |
c5aa993b | 6442 | |
16c381f0 | 6443 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6444 | { |
527159b7 | 6445 | if (debug_infrun) |
8a9de0e4 | 6446 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 6447 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6448 | keep_going (ecs); |
6449 | return; | |
6450 | } | |
c5aa993b | 6451 | |
4b7703ad JB |
6452 | /* Re-fetch current thread's frame in case the code above caused |
6453 | the frame cache to be re-initialized, making our FRAME variable | |
6454 | a dangling pointer. */ | |
6455 | frame = get_current_frame (); | |
628fe4e4 | 6456 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6457 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6458 | |
488f131b | 6459 | /* If stepping through a line, keep going if still within it. |
c906108c | 6460 | |
488f131b JB |
6461 | Note that step_range_end is the address of the first instruction |
6462 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6463 | within it! |
6464 | ||
6465 | Note also that during reverse execution, we may be stepping | |
6466 | through a function epilogue and therefore must detect when | |
6467 | the current-frame changes in the middle of a line. */ | |
6468 | ||
ce4c476a | 6469 | if (pc_in_thread_step_range (stop_pc, ecs->event_thread) |
31410e84 | 6470 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6471 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6472 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6473 | { |
527159b7 | 6474 | if (debug_infrun) |
5af949e3 UW |
6475 | fprintf_unfiltered |
6476 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
6477 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
6478 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6479 | |
c1e36e3e PA |
6480 | /* Tentatively re-enable range stepping; `resume' disables it if |
6481 | necessary (e.g., if we're stepping over a breakpoint or we | |
6482 | have software watchpoints). */ | |
6483 | ecs->event_thread->control.may_range_step = 1; | |
6484 | ||
b2175913 MS |
6485 | /* When stepping backward, stop at beginning of line range |
6486 | (unless it's the function entry point, in which case | |
6487 | keep going back to the call point). */ | |
16c381f0 | 6488 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6489 | && stop_pc != ecs->stop_func_start |
6490 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6491 | end_stepping_range (ecs); |
b2175913 MS |
6492 | else |
6493 | keep_going (ecs); | |
6494 | ||
488f131b JB |
6495 | return; |
6496 | } | |
c5aa993b | 6497 | |
488f131b | 6498 | /* We stepped out of the stepping range. */ |
c906108c | 6499 | |
488f131b | 6500 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6501 | loader dynamic symbol resolution code... |
6502 | ||
6503 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6504 | time loader code and reach the callee's address. | |
6505 | ||
6506 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6507 | the runtime loader code is handled just like any other | |
6508 | undebuggable function call. Now we need only keep stepping | |
6509 | backward through the trampoline code, and that's handled further | |
6510 | down, so there is nothing for us to do here. */ | |
6511 | ||
6512 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6513 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
cfd8ab24 | 6514 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 6515 | { |
4c8c40e6 | 6516 | CORE_ADDR pc_after_resolver = |
568d6575 | 6517 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); |
c906108c | 6518 | |
527159b7 | 6519 | if (debug_infrun) |
3e43a32a MS |
6520 | fprintf_unfiltered (gdb_stdlog, |
6521 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 6522 | |
488f131b JB |
6523 | if (pc_after_resolver) |
6524 | { | |
6525 | /* Set up a step-resume breakpoint at the address | |
6526 | indicated by SKIP_SOLIB_RESOLVER. */ | |
6527 | struct symtab_and_line sr_sal; | |
abbb1732 | 6528 | |
fe39c653 | 6529 | init_sal (&sr_sal); |
488f131b | 6530 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6531 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6532 | |
a6d9a66e UW |
6533 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6534 | sr_sal, null_frame_id); | |
c5aa993b | 6535 | } |
c906108c | 6536 | |
488f131b JB |
6537 | keep_going (ecs); |
6538 | return; | |
6539 | } | |
c906108c | 6540 | |
16c381f0 JK |
6541 | if (ecs->event_thread->control.step_range_end != 1 |
6542 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6543 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6544 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6545 | { |
527159b7 | 6546 | if (debug_infrun) |
3e43a32a MS |
6547 | fprintf_unfiltered (gdb_stdlog, |
6548 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 6549 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6550 | a signal trampoline (either by a signal being delivered or by |
6551 | the signal handler returning). Just single-step until the | |
6552 | inferior leaves the trampoline (either by calling the handler | |
6553 | or returning). */ | |
488f131b JB |
6554 | keep_going (ecs); |
6555 | return; | |
6556 | } | |
c906108c | 6557 | |
14132e89 MR |
6558 | /* If we're in the return path from a shared library trampoline, |
6559 | we want to proceed through the trampoline when stepping. */ | |
6560 | /* macro/2012-04-25: This needs to come before the subroutine | |
6561 | call check below as on some targets return trampolines look | |
6562 | like subroutine calls (MIPS16 return thunks). */ | |
6563 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
6564 | stop_pc, ecs->stop_func_name) | |
6565 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) | |
6566 | { | |
6567 | /* Determine where this trampoline returns. */ | |
6568 | CORE_ADDR real_stop_pc; | |
6569 | ||
6570 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
6571 | ||
6572 | if (debug_infrun) | |
6573 | fprintf_unfiltered (gdb_stdlog, | |
6574 | "infrun: stepped into solib return tramp\n"); | |
6575 | ||
6576 | /* Only proceed through if we know where it's going. */ | |
6577 | if (real_stop_pc) | |
6578 | { | |
6579 | /* And put the step-breakpoint there and go until there. */ | |
6580 | struct symtab_and_line sr_sal; | |
6581 | ||
6582 | init_sal (&sr_sal); /* initialize to zeroes */ | |
6583 | sr_sal.pc = real_stop_pc; | |
6584 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6585 | sr_sal.pspace = get_frame_program_space (frame); | |
6586 | ||
6587 | /* Do not specify what the fp should be when we stop since | |
6588 | on some machines the prologue is where the new fp value | |
6589 | is established. */ | |
6590 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6591 | sr_sal, null_frame_id); | |
6592 | ||
6593 | /* Restart without fiddling with the step ranges or | |
6594 | other state. */ | |
6595 | keep_going (ecs); | |
6596 | return; | |
6597 | } | |
6598 | } | |
6599 | ||
c17eaafe DJ |
6600 | /* Check for subroutine calls. The check for the current frame |
6601 | equalling the step ID is not necessary - the check of the | |
6602 | previous frame's ID is sufficient - but it is a common case and | |
6603 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6604 | |
6605 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6606 | being equal, so to get into this block, both the current and | |
6607 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6608 | /* The outer_frame_id check is a heuristic to detect stepping |
6609 | through startup code. If we step over an instruction which | |
6610 | sets the stack pointer from an invalid value to a valid value, | |
6611 | we may detect that as a subroutine call from the mythical | |
6612 | "outermost" function. This could be fixed by marking | |
6613 | outermost frames as !stack_p,code_p,special_p. Then the | |
6614 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6615 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6616 | for more. */ |
edb3359d | 6617 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6618 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6619 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6620 | ecs->event_thread->control.step_stack_frame_id) |
6621 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6622 | outer_frame_id) |
885eeb5b PA |
6623 | || (ecs->event_thread->control.step_start_function |
6624 | != find_pc_function (stop_pc))))) | |
488f131b | 6625 | { |
95918acb | 6626 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6627 | |
527159b7 | 6628 | if (debug_infrun) |
8a9de0e4 | 6629 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 6630 | |
b7a084be | 6631 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6632 | { |
6633 | /* I presume that step_over_calls is only 0 when we're | |
6634 | supposed to be stepping at the assembly language level | |
6635 | ("stepi"). Just stop. */ | |
388a8562 | 6636 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6637 | end_stepping_range (ecs); |
95918acb AC |
6638 | return; |
6639 | } | |
8fb3e588 | 6640 | |
388a8562 MS |
6641 | /* Reverse stepping through solib trampolines. */ |
6642 | ||
6643 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6644 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6645 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6646 | || (ecs->stop_func_start == 0 | |
6647 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6648 | { | |
6649 | /* Any solib trampoline code can be handled in reverse | |
6650 | by simply continuing to single-step. We have already | |
6651 | executed the solib function (backwards), and a few | |
6652 | steps will take us back through the trampoline to the | |
6653 | caller. */ | |
6654 | keep_going (ecs); | |
6655 | return; | |
6656 | } | |
6657 | ||
16c381f0 | 6658 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6659 | { |
b2175913 MS |
6660 | /* We're doing a "next". |
6661 | ||
6662 | Normal (forward) execution: set a breakpoint at the | |
6663 | callee's return address (the address at which the caller | |
6664 | will resume). | |
6665 | ||
6666 | Reverse (backward) execution. set the step-resume | |
6667 | breakpoint at the start of the function that we just | |
6668 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6669 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6670 | |
6671 | if (execution_direction == EXEC_REVERSE) | |
6672 | { | |
acf9414f JK |
6673 | /* If we're already at the start of the function, we've either |
6674 | just stepped backward into a single instruction function, | |
6675 | or stepped back out of a signal handler to the first instruction | |
6676 | of the function. Just keep going, which will single-step back | |
6677 | to the caller. */ | |
58c48e72 | 6678 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f JK |
6679 | { |
6680 | struct symtab_and_line sr_sal; | |
6681 | ||
6682 | /* Normal function call return (static or dynamic). */ | |
6683 | init_sal (&sr_sal); | |
6684 | sr_sal.pc = ecs->stop_func_start; | |
6685 | sr_sal.pspace = get_frame_program_space (frame); | |
6686 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6687 | sr_sal, null_frame_id); | |
6688 | } | |
b2175913 MS |
6689 | } |
6690 | else | |
568d6575 | 6691 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6692 | |
8567c30f AC |
6693 | keep_going (ecs); |
6694 | return; | |
6695 | } | |
a53c66de | 6696 | |
95918acb | 6697 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6698 | calling routine and the real function), locate the real |
6699 | function. That's what tells us (a) whether we want to step | |
6700 | into it at all, and (b) what prologue we want to run to the | |
6701 | end of, if we do step into it. */ | |
568d6575 | 6702 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6703 | if (real_stop_pc == 0) |
568d6575 | 6704 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6705 | if (real_stop_pc != 0) |
6706 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6707 | |
db5f024e | 6708 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 RC |
6709 | { |
6710 | struct symtab_and_line sr_sal; | |
abbb1732 | 6711 | |
1b2bfbb9 RC |
6712 | init_sal (&sr_sal); |
6713 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 6714 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6715 | |
a6d9a66e UW |
6716 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6717 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6718 | keep_going (ecs); |
6719 | return; | |
1b2bfbb9 RC |
6720 | } |
6721 | ||
95918acb | 6722 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6723 | thinking of stepping into and the function isn't on the skip |
6724 | list, step into it. | |
95918acb | 6725 | |
8fb3e588 AC |
6726 | If there are several symtabs at that PC (e.g. with include |
6727 | files), just want to know whether *any* of them have line | |
6728 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6729 | { |
6730 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6731 | |
95918acb | 6732 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6733 | if (tmp_sal.line != 0 |
85817405 JK |
6734 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
6735 | &tmp_sal)) | |
95918acb | 6736 | { |
b2175913 | 6737 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6738 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6739 | else |
568d6575 | 6740 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6741 | return; |
6742 | } | |
6743 | } | |
6744 | ||
6745 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6746 | set, we stop the step so that the user has a chance to switch |
6747 | in assembly mode. */ | |
16c381f0 | 6748 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6749 | && step_stop_if_no_debug) |
95918acb | 6750 | { |
bdc36728 | 6751 | end_stepping_range (ecs); |
95918acb AC |
6752 | return; |
6753 | } | |
6754 | ||
b2175913 MS |
6755 | if (execution_direction == EXEC_REVERSE) |
6756 | { | |
acf9414f JK |
6757 | /* If we're already at the start of the function, we've either just |
6758 | stepped backward into a single instruction function without line | |
6759 | number info, or stepped back out of a signal handler to the first | |
6760 | instruction of the function without line number info. Just keep | |
6761 | going, which will single-step back to the caller. */ | |
6762 | if (ecs->stop_func_start != stop_pc) | |
6763 | { | |
6764 | /* Set a breakpoint at callee's start address. | |
6765 | From there we can step once and be back in the caller. */ | |
6766 | struct symtab_and_line sr_sal; | |
abbb1732 | 6767 | |
acf9414f JK |
6768 | init_sal (&sr_sal); |
6769 | sr_sal.pc = ecs->stop_func_start; | |
6770 | sr_sal.pspace = get_frame_program_space (frame); | |
6771 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6772 | sr_sal, null_frame_id); | |
6773 | } | |
b2175913 MS |
6774 | } |
6775 | else | |
6776 | /* Set a breakpoint at callee's return address (the address | |
6777 | at which the caller will resume). */ | |
568d6575 | 6778 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6779 | |
95918acb | 6780 | keep_going (ecs); |
488f131b | 6781 | return; |
488f131b | 6782 | } |
c906108c | 6783 | |
fdd654f3 MS |
6784 | /* Reverse stepping through solib trampolines. */ |
6785 | ||
6786 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6787 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 MS |
6788 | { |
6789 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
6790 | || (ecs->stop_func_start == 0 | |
6791 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6792 | { | |
6793 | /* Any solib trampoline code can be handled in reverse | |
6794 | by simply continuing to single-step. We have already | |
6795 | executed the solib function (backwards), and a few | |
6796 | steps will take us back through the trampoline to the | |
6797 | caller. */ | |
6798 | keep_going (ecs); | |
6799 | return; | |
6800 | } | |
6801 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6802 | { | |
6803 | /* Stepped backward into the solib dynsym resolver. | |
6804 | Set a breakpoint at its start and continue, then | |
6805 | one more step will take us out. */ | |
6806 | struct symtab_and_line sr_sal; | |
abbb1732 | 6807 | |
fdd654f3 MS |
6808 | init_sal (&sr_sal); |
6809 | sr_sal.pc = ecs->stop_func_start; | |
9d1807c3 | 6810 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6811 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6812 | sr_sal, null_frame_id); | |
6813 | keep_going (ecs); | |
6814 | return; | |
6815 | } | |
6816 | } | |
6817 | ||
2afb61aa | 6818 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 6819 | |
1b2bfbb9 RC |
6820 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6821 | the trampoline processing logic, however, there are some trampolines | |
6822 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6823 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6824 | && ecs->stop_func_name == NULL |
2afb61aa | 6825 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6826 | { |
527159b7 | 6827 | if (debug_infrun) |
3e43a32a MS |
6828 | fprintf_unfiltered (gdb_stdlog, |
6829 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 6830 | |
1b2bfbb9 | 6831 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6832 | undebuggable function (where there is no debugging information |
6833 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6834 | inferior stopped). Since we want to skip this kind of code, |
6835 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6836 | function - unless the user has asked us not to (via |
6837 | set step-mode) or we no longer know how to get back | |
6838 | to the call site. */ | |
6839 | if (step_stop_if_no_debug | |
c7ce8faa | 6840 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6841 | { |
6842 | /* If we have no line number and the step-stop-if-no-debug | |
6843 | is set, we stop the step so that the user has a chance to | |
6844 | switch in assembly mode. */ | |
bdc36728 | 6845 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6846 | return; |
6847 | } | |
6848 | else | |
6849 | { | |
6850 | /* Set a breakpoint at callee's return address (the address | |
6851 | at which the caller will resume). */ | |
568d6575 | 6852 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6853 | keep_going (ecs); |
6854 | return; | |
6855 | } | |
6856 | } | |
6857 | ||
16c381f0 | 6858 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6859 | { |
6860 | /* It is stepi or nexti. We always want to stop stepping after | |
6861 | one instruction. */ | |
527159b7 | 6862 | if (debug_infrun) |
8a9de0e4 | 6863 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 6864 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6865 | return; |
6866 | } | |
6867 | ||
2afb61aa | 6868 | if (stop_pc_sal.line == 0) |
488f131b JB |
6869 | { |
6870 | /* We have no line number information. That means to stop | |
6871 | stepping (does this always happen right after one instruction, | |
6872 | when we do "s" in a function with no line numbers, | |
6873 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 6874 | if (debug_infrun) |
8a9de0e4 | 6875 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 6876 | end_stepping_range (ecs); |
488f131b JB |
6877 | return; |
6878 | } | |
c906108c | 6879 | |
edb3359d DJ |
6880 | /* Look for "calls" to inlined functions, part one. If the inline |
6881 | frame machinery detected some skipped call sites, we have entered | |
6882 | a new inline function. */ | |
6883 | ||
6884 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6885 | ecs->event_thread->control.step_frame_id) |
edb3359d DJ |
6886 | && inline_skipped_frames (ecs->ptid)) |
6887 | { | |
6888 | struct symtab_and_line call_sal; | |
6889 | ||
6890 | if (debug_infrun) | |
6891 | fprintf_unfiltered (gdb_stdlog, | |
6892 | "infrun: stepped into inlined function\n"); | |
6893 | ||
6894 | find_frame_sal (get_current_frame (), &call_sal); | |
6895 | ||
16c381f0 | 6896 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
6897 | { |
6898 | /* For "step", we're going to stop. But if the call site | |
6899 | for this inlined function is on the same source line as | |
6900 | we were previously stepping, go down into the function | |
6901 | first. Otherwise stop at the call site. */ | |
6902 | ||
6903 | if (call_sal.line == ecs->event_thread->current_line | |
6904 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6905 | step_into_inline_frame (ecs->ptid); | |
6906 | ||
bdc36728 | 6907 | end_stepping_range (ecs); |
edb3359d DJ |
6908 | return; |
6909 | } | |
6910 | else | |
6911 | { | |
6912 | /* For "next", we should stop at the call site if it is on a | |
6913 | different source line. Otherwise continue through the | |
6914 | inlined function. */ | |
6915 | if (call_sal.line == ecs->event_thread->current_line | |
6916 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6917 | keep_going (ecs); | |
6918 | else | |
bdc36728 | 6919 | end_stepping_range (ecs); |
edb3359d DJ |
6920 | return; |
6921 | } | |
6922 | } | |
6923 | ||
6924 | /* Look for "calls" to inlined functions, part two. If we are still | |
6925 | in the same real function we were stepping through, but we have | |
6926 | to go further up to find the exact frame ID, we are stepping | |
6927 | through a more inlined call beyond its call site. */ | |
6928 | ||
6929 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
6930 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6931 | ecs->event_thread->control.step_frame_id) |
edb3359d | 6932 | && stepped_in_from (get_current_frame (), |
16c381f0 | 6933 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
6934 | { |
6935 | if (debug_infrun) | |
6936 | fprintf_unfiltered (gdb_stdlog, | |
6937 | "infrun: stepping through inlined function\n"); | |
6938 | ||
16c381f0 | 6939 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
6940 | keep_going (ecs); |
6941 | else | |
bdc36728 | 6942 | end_stepping_range (ecs); |
edb3359d DJ |
6943 | return; |
6944 | } | |
6945 | ||
2afb61aa | 6946 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
6947 | && (ecs->event_thread->current_line != stop_pc_sal.line |
6948 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
6949 | { |
6950 | /* We are at the start of a different line. So stop. Note that | |
6951 | we don't stop if we step into the middle of a different line. | |
6952 | That is said to make things like for (;;) statements work | |
6953 | better. */ | |
527159b7 | 6954 | if (debug_infrun) |
3e43a32a MS |
6955 | fprintf_unfiltered (gdb_stdlog, |
6956 | "infrun: stepped to a different line\n"); | |
bdc36728 | 6957 | end_stepping_range (ecs); |
488f131b JB |
6958 | return; |
6959 | } | |
c906108c | 6960 | |
488f131b | 6961 | /* We aren't done stepping. |
c906108c | 6962 | |
488f131b JB |
6963 | Optimize by setting the stepping range to the line. |
6964 | (We might not be in the original line, but if we entered a | |
6965 | new line in mid-statement, we continue stepping. This makes | |
6966 | things like for(;;) statements work better.) */ | |
c906108c | 6967 | |
16c381f0 JK |
6968 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
6969 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 6970 | ecs->event_thread->control.may_range_step = 1; |
edb3359d | 6971 | set_step_info (frame, stop_pc_sal); |
488f131b | 6972 | |
527159b7 | 6973 | if (debug_infrun) |
8a9de0e4 | 6974 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 6975 | keep_going (ecs); |
104c1213 JM |
6976 | } |
6977 | ||
c447ac0b PA |
6978 | /* In all-stop mode, if we're currently stepping but have stopped in |
6979 | some other thread, we may need to switch back to the stepped | |
6980 | thread. Returns true we set the inferior running, false if we left | |
6981 | it stopped (and the event needs further processing). */ | |
6982 | ||
6983 | static int | |
6984 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
6985 | { | |
fbea99ea | 6986 | if (!target_is_non_stop_p ()) |
c447ac0b PA |
6987 | { |
6988 | struct thread_info *tp; | |
99619bea PA |
6989 | struct thread_info *stepping_thread; |
6990 | ||
6991 | /* If any thread is blocked on some internal breakpoint, and we | |
6992 | simply need to step over that breakpoint to get it going | |
6993 | again, do that first. */ | |
6994 | ||
6995 | /* However, if we see an event for the stepping thread, then we | |
6996 | know all other threads have been moved past their breakpoints | |
6997 | already. Let the caller check whether the step is finished, | |
6998 | etc., before deciding to move it past a breakpoint. */ | |
6999 | if (ecs->event_thread->control.step_range_end != 0) | |
7000 | return 0; | |
7001 | ||
7002 | /* Check if the current thread is blocked on an incomplete | |
7003 | step-over, interrupted by a random signal. */ | |
7004 | if (ecs->event_thread->control.trap_expected | |
7005 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7006 | { |
99619bea PA |
7007 | if (debug_infrun) |
7008 | { | |
7009 | fprintf_unfiltered (gdb_stdlog, | |
7010 | "infrun: need to finish step-over of [%s]\n", | |
7011 | target_pid_to_str (ecs->event_thread->ptid)); | |
7012 | } | |
7013 | keep_going (ecs); | |
7014 | return 1; | |
7015 | } | |
2adfaa28 | 7016 | |
99619bea PA |
7017 | /* Check if the current thread is blocked by a single-step |
7018 | breakpoint of another thread. */ | |
7019 | if (ecs->hit_singlestep_breakpoint) | |
7020 | { | |
7021 | if (debug_infrun) | |
7022 | { | |
7023 | fprintf_unfiltered (gdb_stdlog, | |
7024 | "infrun: need to step [%s] over single-step " | |
7025 | "breakpoint\n", | |
7026 | target_pid_to_str (ecs->ptid)); | |
7027 | } | |
7028 | keep_going (ecs); | |
7029 | return 1; | |
7030 | } | |
7031 | ||
4d9d9d04 PA |
7032 | /* If this thread needs yet another step-over (e.g., stepping |
7033 | through a delay slot), do it first before moving on to | |
7034 | another thread. */ | |
7035 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7036 | { | |
7037 | if (debug_infrun) | |
7038 | { | |
7039 | fprintf_unfiltered (gdb_stdlog, | |
7040 | "infrun: thread [%s] still needs step-over\n", | |
7041 | target_pid_to_str (ecs->event_thread->ptid)); | |
7042 | } | |
7043 | keep_going (ecs); | |
7044 | return 1; | |
7045 | } | |
70509625 | 7046 | |
483805cf PA |
7047 | /* If scheduler locking applies even if not stepping, there's no |
7048 | need to walk over threads. Above we've checked whether the | |
7049 | current thread is stepping. If some other thread not the | |
7050 | event thread is stepping, then it must be that scheduler | |
7051 | locking is not in effect. */ | |
856e7dd6 | 7052 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
7053 | return 0; |
7054 | ||
4d9d9d04 PA |
7055 | /* Otherwise, we no longer expect a trap in the current thread. |
7056 | Clear the trap_expected flag before switching back -- this is | |
7057 | what keep_going does as well, if we call it. */ | |
7058 | ecs->event_thread->control.trap_expected = 0; | |
7059 | ||
7060 | /* Likewise, clear the signal if it should not be passed. */ | |
7061 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7062 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7063 | ||
7064 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 7065 | step/next/etc. */ |
4d9d9d04 PA |
7066 | if (start_step_over ()) |
7067 | { | |
7068 | prepare_to_wait (ecs); | |
7069 | return 1; | |
7070 | } | |
7071 | ||
7072 | /* Look for the stepping/nexting thread. */ | |
483805cf | 7073 | stepping_thread = NULL; |
4d9d9d04 | 7074 | |
034f788c | 7075 | ALL_NON_EXITED_THREADS (tp) |
483805cf | 7076 | { |
fbea99ea PA |
7077 | /* Ignore threads of processes the caller is not |
7078 | resuming. */ | |
483805cf | 7079 | if (!sched_multi |
1afd5965 | 7080 | && ptid_get_pid (tp->ptid) != ptid_get_pid (ecs->ptid)) |
483805cf PA |
7081 | continue; |
7082 | ||
7083 | /* When stepping over a breakpoint, we lock all threads | |
7084 | except the one that needs to move past the breakpoint. | |
7085 | If a non-event thread has this set, the "incomplete | |
7086 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
7087 | if (tp->control.trap_expected) |
7088 | { | |
7089 | internal_error (__FILE__, __LINE__, | |
7090 | "[%s] has inconsistent state: " | |
7091 | "trap_expected=%d\n", | |
7092 | target_pid_to_str (tp->ptid), | |
7093 | tp->control.trap_expected); | |
7094 | } | |
483805cf PA |
7095 | |
7096 | /* Did we find the stepping thread? */ | |
7097 | if (tp->control.step_range_end) | |
7098 | { | |
7099 | /* Yep. There should only one though. */ | |
7100 | gdb_assert (stepping_thread == NULL); | |
7101 | ||
7102 | /* The event thread is handled at the top, before we | |
7103 | enter this loop. */ | |
7104 | gdb_assert (tp != ecs->event_thread); | |
7105 | ||
7106 | /* If some thread other than the event thread is | |
7107 | stepping, then scheduler locking can't be in effect, | |
7108 | otherwise we wouldn't have resumed the current event | |
7109 | thread in the first place. */ | |
856e7dd6 | 7110 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
7111 | |
7112 | stepping_thread = tp; | |
7113 | } | |
99619bea PA |
7114 | } |
7115 | ||
483805cf | 7116 | if (stepping_thread != NULL) |
99619bea | 7117 | { |
c447ac0b PA |
7118 | if (debug_infrun) |
7119 | fprintf_unfiltered (gdb_stdlog, | |
7120 | "infrun: switching back to stepped thread\n"); | |
7121 | ||
2ac7589c PA |
7122 | if (keep_going_stepped_thread (stepping_thread)) |
7123 | { | |
7124 | prepare_to_wait (ecs); | |
7125 | return 1; | |
7126 | } | |
7127 | } | |
7128 | } | |
2adfaa28 | 7129 | |
2ac7589c PA |
7130 | return 0; |
7131 | } | |
2adfaa28 | 7132 | |
2ac7589c PA |
7133 | /* Set a previously stepped thread back to stepping. Returns true on |
7134 | success, false if the resume is not possible (e.g., the thread | |
7135 | vanished). */ | |
7136 | ||
7137 | static int | |
7138 | keep_going_stepped_thread (struct thread_info *tp) | |
7139 | { | |
7140 | struct frame_info *frame; | |
7141 | struct gdbarch *gdbarch; | |
7142 | struct execution_control_state ecss; | |
7143 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7144 | |
2ac7589c PA |
7145 | /* If the stepping thread exited, then don't try to switch back and |
7146 | resume it, which could fail in several different ways depending | |
7147 | on the target. Instead, just keep going. | |
2adfaa28 | 7148 | |
2ac7589c PA |
7149 | We can find a stepping dead thread in the thread list in two |
7150 | cases: | |
2adfaa28 | 7151 | |
2ac7589c PA |
7152 | - The target supports thread exit events, and when the target |
7153 | tries to delete the thread from the thread list, inferior_ptid | |
7154 | pointed at the exiting thread. In such case, calling | |
7155 | delete_thread does not really remove the thread from the list; | |
7156 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7157 | |
2ac7589c PA |
7158 | - The target's debug interface does not support thread exit |
7159 | events, and so we have no idea whatsoever if the previously | |
7160 | stepping thread is still alive. For that reason, we need to | |
7161 | synchronously query the target now. */ | |
2adfaa28 | 7162 | |
2ac7589c PA |
7163 | if (is_exited (tp->ptid) |
7164 | || !target_thread_alive (tp->ptid)) | |
7165 | { | |
7166 | if (debug_infrun) | |
7167 | fprintf_unfiltered (gdb_stdlog, | |
7168 | "infrun: not resuming previously " | |
7169 | "stepped thread, it has vanished\n"); | |
7170 | ||
7171 | delete_thread (tp->ptid); | |
7172 | return 0; | |
c447ac0b | 7173 | } |
2ac7589c PA |
7174 | |
7175 | if (debug_infrun) | |
7176 | fprintf_unfiltered (gdb_stdlog, | |
7177 | "infrun: resuming previously stepped thread\n"); | |
7178 | ||
7179 | reset_ecs (ecs, tp); | |
7180 | switch_to_thread (tp->ptid); | |
7181 | ||
7182 | stop_pc = regcache_read_pc (get_thread_regcache (tp->ptid)); | |
7183 | frame = get_current_frame (); | |
7184 | gdbarch = get_frame_arch (frame); | |
7185 | ||
7186 | /* If the PC of the thread we were trying to single-step has | |
7187 | changed, then that thread has trapped or been signaled, but the | |
7188 | event has not been reported to GDB yet. Re-poll the target | |
7189 | looking for this particular thread's event (i.e. temporarily | |
7190 | enable schedlock) by: | |
7191 | ||
7192 | - setting a break at the current PC | |
7193 | - resuming that particular thread, only (by setting trap | |
7194 | expected) | |
7195 | ||
7196 | This prevents us continuously moving the single-step breakpoint | |
7197 | forward, one instruction at a time, overstepping. */ | |
7198 | ||
7199 | if (stop_pc != tp->prev_pc) | |
7200 | { | |
7201 | ptid_t resume_ptid; | |
7202 | ||
7203 | if (debug_infrun) | |
7204 | fprintf_unfiltered (gdb_stdlog, | |
7205 | "infrun: expected thread advanced also (%s -> %s)\n", | |
7206 | paddress (target_gdbarch (), tp->prev_pc), | |
7207 | paddress (target_gdbarch (), stop_pc)); | |
7208 | ||
7209 | /* Clear the info of the previous step-over, as it's no longer | |
7210 | valid (if the thread was trying to step over a breakpoint, it | |
7211 | has already succeeded). It's what keep_going would do too, | |
7212 | if we called it. Do this before trying to insert the sss | |
7213 | breakpoint, otherwise if we were previously trying to step | |
7214 | over this exact address in another thread, the breakpoint is | |
7215 | skipped. */ | |
7216 | clear_step_over_info (); | |
7217 | tp->control.trap_expected = 0; | |
7218 | ||
7219 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7220 | get_frame_address_space (frame), | |
7221 | stop_pc); | |
7222 | ||
372316f1 | 7223 | tp->resumed = 1; |
fbea99ea | 7224 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7225 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7226 | } | |
7227 | else | |
7228 | { | |
7229 | if (debug_infrun) | |
7230 | fprintf_unfiltered (gdb_stdlog, | |
7231 | "infrun: expected thread still hasn't advanced\n"); | |
7232 | ||
7233 | keep_going_pass_signal (ecs); | |
7234 | } | |
7235 | return 1; | |
c447ac0b PA |
7236 | } |
7237 | ||
8b061563 PA |
7238 | /* Is thread TP in the middle of (software or hardware) |
7239 | single-stepping? (Note the result of this function must never be | |
7240 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7241 | |
a289b8f6 | 7242 | static int |
b3444185 | 7243 | currently_stepping (struct thread_info *tp) |
a7212384 | 7244 | { |
8358c15c JK |
7245 | return ((tp->control.step_range_end |
7246 | && tp->control.step_resume_breakpoint == NULL) | |
7247 | || tp->control.trap_expected | |
af48d08f | 7248 | || tp->stepped_breakpoint |
8358c15c | 7249 | || bpstat_should_step ()); |
a7212384 UW |
7250 | } |
7251 | ||
b2175913 MS |
7252 | /* Inferior has stepped into a subroutine call with source code that |
7253 | we should not step over. Do step to the first line of code in | |
7254 | it. */ | |
c2c6d25f JM |
7255 | |
7256 | static void | |
568d6575 UW |
7257 | handle_step_into_function (struct gdbarch *gdbarch, |
7258 | struct execution_control_state *ecs) | |
c2c6d25f | 7259 | { |
43f3e411 | 7260 | struct compunit_symtab *cust; |
2afb61aa | 7261 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f | 7262 | |
7e324e48 GB |
7263 | fill_in_stop_func (gdbarch, ecs); |
7264 | ||
43f3e411 DE |
7265 | cust = find_pc_compunit_symtab (stop_pc); |
7266 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 7267 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 | 7268 | ecs->stop_func_start); |
c2c6d25f | 7269 | |
2afb61aa | 7270 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7271 | /* Use the step_resume_break to step until the end of the prologue, |
7272 | even if that involves jumps (as it seems to on the vax under | |
7273 | 4.2). */ | |
7274 | /* If the prologue ends in the middle of a source line, continue to | |
7275 | the end of that source line (if it is still within the function). | |
7276 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7277 | if (stop_func_sal.end |
7278 | && stop_func_sal.pc != ecs->stop_func_start | |
7279 | && stop_func_sal.end < ecs->stop_func_end) | |
7280 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7281 | |
2dbd5e30 KB |
7282 | /* Architectures which require breakpoint adjustment might not be able |
7283 | to place a breakpoint at the computed address. If so, the test | |
7284 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7285 | ecs->stop_func_start to an address at which a breakpoint may be | |
7286 | legitimately placed. | |
8fb3e588 | 7287 | |
2dbd5e30 KB |
7288 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7289 | made, GDB will enter an infinite loop when stepping through | |
7290 | optimized code consisting of VLIW instructions which contain | |
7291 | subinstructions corresponding to different source lines. On | |
7292 | FR-V, it's not permitted to place a breakpoint on any but the | |
7293 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7294 | set, GDB will adjust the breakpoint address to the beginning of | |
7295 | the VLIW instruction. Thus, we need to make the corresponding | |
7296 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7297 | |
568d6575 | 7298 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7299 | { |
7300 | ecs->stop_func_start | |
568d6575 | 7301 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7302 | ecs->stop_func_start); |
2dbd5e30 KB |
7303 | } |
7304 | ||
c2c6d25f JM |
7305 | if (ecs->stop_func_start == stop_pc) |
7306 | { | |
7307 | /* We are already there: stop now. */ | |
bdc36728 | 7308 | end_stepping_range (ecs); |
c2c6d25f JM |
7309 | return; |
7310 | } | |
7311 | else | |
7312 | { | |
7313 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 7314 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
7315 | sr_sal.pc = ecs->stop_func_start; |
7316 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7317 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7318 | |
c2c6d25f | 7319 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7320 | some machines the prologue is where the new fp value is |
7321 | established. */ | |
a6d9a66e | 7322 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7323 | |
7324 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7325 | ecs->event_thread->control.step_range_end |
7326 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7327 | } |
7328 | keep_going (ecs); | |
7329 | } | |
d4f3574e | 7330 | |
b2175913 MS |
7331 | /* Inferior has stepped backward into a subroutine call with source |
7332 | code that we should not step over. Do step to the beginning of the | |
7333 | last line of code in it. */ | |
7334 | ||
7335 | static void | |
568d6575 UW |
7336 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7337 | struct execution_control_state *ecs) | |
b2175913 | 7338 | { |
43f3e411 | 7339 | struct compunit_symtab *cust; |
167e4384 | 7340 | struct symtab_and_line stop_func_sal; |
b2175913 | 7341 | |
7e324e48 GB |
7342 | fill_in_stop_func (gdbarch, ecs); |
7343 | ||
43f3e411 DE |
7344 | cust = find_pc_compunit_symtab (stop_pc); |
7345 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 7346 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 MS |
7347 | ecs->stop_func_start); |
7348 | ||
7349 | stop_func_sal = find_pc_line (stop_pc, 0); | |
7350 | ||
7351 | /* OK, we're just going to keep stepping here. */ | |
7352 | if (stop_func_sal.pc == stop_pc) | |
7353 | { | |
7354 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7355 | end_stepping_range (ecs); |
b2175913 MS |
7356 | } |
7357 | else | |
7358 | { | |
7359 | /* Else just reset the step range and keep going. | |
7360 | No step-resume breakpoint, they don't work for | |
7361 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7362 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7363 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7364 | keep_going (ecs); |
7365 | } | |
7366 | return; | |
7367 | } | |
7368 | ||
d3169d93 | 7369 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7370 | This is used to both functions and to skip over code. */ |
7371 | ||
7372 | static void | |
2c03e5be PA |
7373 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7374 | struct symtab_and_line sr_sal, | |
7375 | struct frame_id sr_id, | |
7376 | enum bptype sr_type) | |
44cbf7b5 | 7377 | { |
611c83ae PA |
7378 | /* There should never be more than one step-resume or longjmp-resume |
7379 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7380 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7381 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7382 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
7383 | |
7384 | if (debug_infrun) | |
7385 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7386 | "infrun: inserting step-resume breakpoint at %s\n", |
7387 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7388 | |
8358c15c | 7389 | inferior_thread ()->control.step_resume_breakpoint |
2c03e5be PA |
7390 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type); |
7391 | } | |
7392 | ||
9da8c2a0 | 7393 | void |
2c03e5be PA |
7394 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7395 | struct symtab_and_line sr_sal, | |
7396 | struct frame_id sr_id) | |
7397 | { | |
7398 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7399 | sr_sal, sr_id, | |
7400 | bp_step_resume); | |
44cbf7b5 | 7401 | } |
7ce450bd | 7402 | |
2c03e5be PA |
7403 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7404 | This is used to skip a potential signal handler. | |
7ce450bd | 7405 | |
14e60db5 DJ |
7406 | This is called with the interrupted function's frame. The signal |
7407 | handler, when it returns, will resume the interrupted function at | |
7408 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7409 | |
7410 | static void | |
2c03e5be | 7411 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
7412 | { |
7413 | struct symtab_and_line sr_sal; | |
a6d9a66e | 7414 | struct gdbarch *gdbarch; |
d303a6c7 | 7415 | |
f4c1edd8 | 7416 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
7417 | init_sal (&sr_sal); /* initialize to zeros */ |
7418 | ||
a6d9a66e | 7419 | gdbarch = get_frame_arch (return_frame); |
568d6575 | 7420 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7421 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7422 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7423 | |
2c03e5be PA |
7424 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7425 | get_stack_frame_id (return_frame), | |
7426 | bp_hp_step_resume); | |
d303a6c7 AC |
7427 | } |
7428 | ||
2c03e5be PA |
7429 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7430 | is used to skip a function after stepping into it (for "next" or if | |
7431 | the called function has no debugging information). | |
14e60db5 DJ |
7432 | |
7433 | The current function has almost always been reached by single | |
7434 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7435 | current function, and the breakpoint will be set at the caller's | |
7436 | resume address. | |
7437 | ||
7438 | This is a separate function rather than reusing | |
2c03e5be | 7439 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7440 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7441 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7442 | |
7443 | static void | |
7444 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7445 | { | |
7446 | struct symtab_and_line sr_sal; | |
a6d9a66e | 7447 | struct gdbarch *gdbarch; |
14e60db5 DJ |
7448 | |
7449 | /* We shouldn't have gotten here if we don't know where the call site | |
7450 | is. */ | |
c7ce8faa | 7451 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 DJ |
7452 | |
7453 | init_sal (&sr_sal); /* initialize to zeros */ | |
7454 | ||
a6d9a66e | 7455 | gdbarch = frame_unwind_caller_arch (next_frame); |
c7ce8faa DJ |
7456 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7457 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7458 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7459 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7460 | |
a6d9a66e | 7461 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7462 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7463 | } |
7464 | ||
611c83ae PA |
7465 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7466 | new breakpoint at the target of a jmp_buf. The handling of | |
7467 | longjmp-resume uses the same mechanisms used for handling | |
7468 | "step-resume" breakpoints. */ | |
7469 | ||
7470 | static void | |
a6d9a66e | 7471 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7472 | { |
e81a37f7 TT |
7473 | /* There should never be more than one longjmp-resume breakpoint per |
7474 | thread, so we should never be setting a new | |
611c83ae | 7475 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7476 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
7477 | |
7478 | if (debug_infrun) | |
7479 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7480 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
7481 | paddress (gdbarch, pc)); | |
611c83ae | 7482 | |
e81a37f7 | 7483 | inferior_thread ()->control.exception_resume_breakpoint = |
a6d9a66e | 7484 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); |
611c83ae PA |
7485 | } |
7486 | ||
186c406b TT |
7487 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7488 | the exception. The block B is the block of the unwinder debug hook | |
7489 | function. FRAME is the frame corresponding to the call to this | |
7490 | function. SYM is the symbol of the function argument holding the | |
7491 | target PC of the exception. */ | |
7492 | ||
7493 | static void | |
7494 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7495 | const struct block *b, |
186c406b TT |
7496 | struct frame_info *frame, |
7497 | struct symbol *sym) | |
7498 | { | |
492d29ea | 7499 | TRY |
186c406b | 7500 | { |
63e43d3a | 7501 | struct block_symbol vsym; |
186c406b TT |
7502 | struct value *value; |
7503 | CORE_ADDR handler; | |
7504 | struct breakpoint *bp; | |
7505 | ||
63e43d3a PMR |
7506 | vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL); |
7507 | value = read_var_value (vsym.symbol, vsym.block, frame); | |
186c406b TT |
7508 | /* If the value was optimized out, revert to the old behavior. */ |
7509 | if (! value_optimized_out (value)) | |
7510 | { | |
7511 | handler = value_as_address (value); | |
7512 | ||
7513 | if (debug_infrun) | |
7514 | fprintf_unfiltered (gdb_stdlog, | |
7515 | "infrun: exception resume at %lx\n", | |
7516 | (unsigned long) handler); | |
7517 | ||
7518 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7519 | handler, bp_exception_resume); | |
c70a6932 JK |
7520 | |
7521 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7522 | frame = NULL; | |
7523 | ||
5d5658a1 | 7524 | bp->thread = tp->global_num; |
186c406b TT |
7525 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7526 | } | |
7527 | } | |
492d29ea PA |
7528 | CATCH (e, RETURN_MASK_ERROR) |
7529 | { | |
7530 | /* We want to ignore errors here. */ | |
7531 | } | |
7532 | END_CATCH | |
186c406b TT |
7533 | } |
7534 | ||
28106bc2 SDJ |
7535 | /* A helper for check_exception_resume that sets an |
7536 | exception-breakpoint based on a SystemTap probe. */ | |
7537 | ||
7538 | static void | |
7539 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7540 | const struct bound_probe *probe, |
28106bc2 SDJ |
7541 | struct frame_info *frame) |
7542 | { | |
7543 | struct value *arg_value; | |
7544 | CORE_ADDR handler; | |
7545 | struct breakpoint *bp; | |
7546 | ||
7547 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7548 | if (!arg_value) | |
7549 | return; | |
7550 | ||
7551 | handler = value_as_address (arg_value); | |
7552 | ||
7553 | if (debug_infrun) | |
7554 | fprintf_unfiltered (gdb_stdlog, | |
7555 | "infrun: exception resume at %s\n", | |
6bac7473 | 7556 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
7557 | handler)); |
7558 | ||
7559 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7560 | handler, bp_exception_resume); | |
5d5658a1 | 7561 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7562 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7563 | } | |
7564 | ||
186c406b TT |
7565 | /* This is called when an exception has been intercepted. Check to |
7566 | see whether the exception's destination is of interest, and if so, | |
7567 | set an exception resume breakpoint there. */ | |
7568 | ||
7569 | static void | |
7570 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7571 | struct frame_info *frame) |
186c406b | 7572 | { |
729662a5 | 7573 | struct bound_probe probe; |
28106bc2 SDJ |
7574 | struct symbol *func; |
7575 | ||
7576 | /* First see if this exception unwinding breakpoint was set via a | |
7577 | SystemTap probe point. If so, the probe has two arguments: the | |
7578 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7579 | set a breakpoint there. */ | |
6bac7473 | 7580 | probe = find_probe_by_pc (get_frame_pc (frame)); |
729662a5 | 7581 | if (probe.probe) |
28106bc2 | 7582 | { |
729662a5 | 7583 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7584 | return; |
7585 | } | |
7586 | ||
7587 | func = get_frame_function (frame); | |
7588 | if (!func) | |
7589 | return; | |
186c406b | 7590 | |
492d29ea | 7591 | TRY |
186c406b | 7592 | { |
3977b71f | 7593 | const struct block *b; |
8157b174 | 7594 | struct block_iterator iter; |
186c406b TT |
7595 | struct symbol *sym; |
7596 | int argno = 0; | |
7597 | ||
7598 | /* The exception breakpoint is a thread-specific breakpoint on | |
7599 | the unwinder's debug hook, declared as: | |
7600 | ||
7601 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7602 | ||
7603 | The CFA argument indicates the frame to which control is | |
7604 | about to be transferred. HANDLER is the destination PC. | |
7605 | ||
7606 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7607 | This is not extremely efficient but it avoids issues in gdb | |
7608 | with computing the DWARF CFA, and it also works even in weird | |
7609 | cases such as throwing an exception from inside a signal | |
7610 | handler. */ | |
7611 | ||
7612 | b = SYMBOL_BLOCK_VALUE (func); | |
7613 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7614 | { | |
7615 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7616 | continue; | |
7617 | ||
7618 | if (argno == 0) | |
7619 | ++argno; | |
7620 | else | |
7621 | { | |
7622 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7623 | b, frame, sym); | |
7624 | break; | |
7625 | } | |
7626 | } | |
7627 | } | |
492d29ea PA |
7628 | CATCH (e, RETURN_MASK_ERROR) |
7629 | { | |
7630 | } | |
7631 | END_CATCH | |
186c406b TT |
7632 | } |
7633 | ||
104c1213 | 7634 | static void |
22bcd14b | 7635 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7636 | { |
527159b7 | 7637 | if (debug_infrun) |
22bcd14b | 7638 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 7639 | |
31e77af2 PA |
7640 | clear_step_over_info (); |
7641 | ||
cd0fc7c3 SS |
7642 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7643 | ecs->wait_some_more = 0; | |
fbea99ea PA |
7644 | |
7645 | /* If all-stop, but the target is always in non-stop mode, stop all | |
7646 | threads now that we're presenting the stop to the user. */ | |
7647 | if (!non_stop && target_is_non_stop_p ()) | |
7648 | stop_all_threads (); | |
cd0fc7c3 SS |
7649 | } |
7650 | ||
4d9d9d04 PA |
7651 | /* Like keep_going, but passes the signal to the inferior, even if the |
7652 | signal is set to nopass. */ | |
d4f3574e SS |
7653 | |
7654 | static void | |
4d9d9d04 | 7655 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7656 | { |
c4dbc9af PA |
7657 | /* Make sure normal_stop is called if we get a QUIT handled before |
7658 | reaching resume. */ | |
7659 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
7660 | ||
4d9d9d04 | 7661 | gdb_assert (ptid_equal (ecs->event_thread->ptid, inferior_ptid)); |
372316f1 | 7662 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7663 | |
d4f3574e | 7664 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
7665 | ecs->event_thread->prev_pc |
7666 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 7667 | |
4d9d9d04 | 7668 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7669 | { |
4d9d9d04 PA |
7670 | struct thread_info *tp = ecs->event_thread; |
7671 | ||
7672 | if (debug_infrun) | |
7673 | fprintf_unfiltered (gdb_stdlog, | |
7674 | "infrun: %s has trap_expected set, " | |
7675 | "resuming to collect trap\n", | |
7676 | target_pid_to_str (tp->ptid)); | |
7677 | ||
a9ba6bae PA |
7678 | /* We haven't yet gotten our trap, and either: intercepted a |
7679 | non-signal event (e.g., a fork); or took a signal which we | |
7680 | are supposed to pass through to the inferior. Simply | |
7681 | continue. */ | |
c4dbc9af | 7682 | discard_cleanups (old_cleanups); |
64ce06e4 | 7683 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7684 | } |
372316f1 PA |
7685 | else if (step_over_info_valid_p ()) |
7686 | { | |
7687 | /* Another thread is stepping over a breakpoint in-line. If | |
7688 | this thread needs a step-over too, queue the request. In | |
7689 | either case, this resume must be deferred for later. */ | |
7690 | struct thread_info *tp = ecs->event_thread; | |
7691 | ||
7692 | if (ecs->hit_singlestep_breakpoint | |
7693 | || thread_still_needs_step_over (tp)) | |
7694 | { | |
7695 | if (debug_infrun) | |
7696 | fprintf_unfiltered (gdb_stdlog, | |
7697 | "infrun: step-over already in progress: " | |
7698 | "step-over for %s deferred\n", | |
7699 | target_pid_to_str (tp->ptid)); | |
7700 | thread_step_over_chain_enqueue (tp); | |
7701 | } | |
7702 | else | |
7703 | { | |
7704 | if (debug_infrun) | |
7705 | fprintf_unfiltered (gdb_stdlog, | |
7706 | "infrun: step-over in progress: " | |
7707 | "resume of %s deferred\n", | |
7708 | target_pid_to_str (tp->ptid)); | |
7709 | } | |
7710 | ||
7711 | discard_cleanups (old_cleanups); | |
7712 | } | |
d4f3574e SS |
7713 | else |
7714 | { | |
31e77af2 | 7715 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7716 | int remove_bp; |
7717 | int remove_wps; | |
8d297bbf | 7718 | step_over_what step_what; |
31e77af2 | 7719 | |
d4f3574e | 7720 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7721 | anyway (if we got a signal, the user asked it be passed to |
7722 | the child) | |
7723 | -- or -- | |
7724 | We got our expected trap, but decided we should resume from | |
7725 | it. | |
d4f3574e | 7726 | |
a9ba6bae | 7727 | We're going to run this baby now! |
d4f3574e | 7728 | |
c36b740a VP |
7729 | Note that insert_breakpoints won't try to re-insert |
7730 | already inserted breakpoints. Therefore, we don't | |
7731 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7732 | |
31e77af2 PA |
7733 | /* If we need to step over a breakpoint, and we're not using |
7734 | displaced stepping to do so, insert all breakpoints | |
7735 | (watchpoints, etc.) but the one we're stepping over, step one | |
7736 | instruction, and then re-insert the breakpoint when that step | |
7737 | is finished. */ | |
963f9c80 | 7738 | |
6c4cfb24 PA |
7739 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7740 | ||
963f9c80 | 7741 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7742 | || (step_what & STEP_OVER_BREAKPOINT)); |
7743 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7744 | |
cb71640d PA |
7745 | /* We can't use displaced stepping if we need to step past a |
7746 | watchpoint. The instruction copied to the scratch pad would | |
7747 | still trigger the watchpoint. */ | |
7748 | if (remove_bp | |
3fc8eb30 | 7749 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7750 | { |
31e77af2 | 7751 | set_step_over_info (get_regcache_aspace (regcache), |
963f9c80 | 7752 | regcache_read_pc (regcache), remove_wps); |
45e8c884 | 7753 | } |
963f9c80 PA |
7754 | else if (remove_wps) |
7755 | set_step_over_info (NULL, 0, remove_wps); | |
372316f1 PA |
7756 | |
7757 | /* If we now need to do an in-line step-over, we need to stop | |
7758 | all other threads. Note this must be done before | |
7759 | insert_breakpoints below, because that removes the breakpoint | |
7760 | we're about to step over, otherwise other threads could miss | |
7761 | it. */ | |
fbea99ea | 7762 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7763 | stop_all_threads (); |
abbb1732 | 7764 | |
31e77af2 | 7765 | /* Stop stepping if inserting breakpoints fails. */ |
492d29ea | 7766 | TRY |
31e77af2 PA |
7767 | { |
7768 | insert_breakpoints (); | |
7769 | } | |
492d29ea | 7770 | CATCH (e, RETURN_MASK_ERROR) |
31e77af2 PA |
7771 | { |
7772 | exception_print (gdb_stderr, e); | |
22bcd14b | 7773 | stop_waiting (ecs); |
de1fe8c8 | 7774 | discard_cleanups (old_cleanups); |
31e77af2 | 7775 | return; |
d4f3574e | 7776 | } |
492d29ea | 7777 | END_CATCH |
d4f3574e | 7778 | |
963f9c80 | 7779 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7780 | |
c4dbc9af | 7781 | discard_cleanups (old_cleanups); |
64ce06e4 | 7782 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7783 | } |
7784 | ||
488f131b | 7785 | prepare_to_wait (ecs); |
d4f3574e SS |
7786 | } |
7787 | ||
4d9d9d04 PA |
7788 | /* Called when we should continue running the inferior, because the |
7789 | current event doesn't cause a user visible stop. This does the | |
7790 | resuming part; waiting for the next event is done elsewhere. */ | |
7791 | ||
7792 | static void | |
7793 | keep_going (struct execution_control_state *ecs) | |
7794 | { | |
7795 | if (ecs->event_thread->control.trap_expected | |
7796 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7797 | ecs->event_thread->control.trap_expected = 0; | |
7798 | ||
7799 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7800 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7801 | keep_going_pass_signal (ecs); | |
7802 | } | |
7803 | ||
104c1213 JM |
7804 | /* This function normally comes after a resume, before |
7805 | handle_inferior_event exits. It takes care of any last bits of | |
7806 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7807 | |
104c1213 JM |
7808 | static void |
7809 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7810 | { |
527159b7 | 7811 | if (debug_infrun) |
8a9de0e4 | 7812 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 7813 | |
104c1213 | 7814 | ecs->wait_some_more = 1; |
0b333c5e PA |
7815 | |
7816 | if (!target_is_async_p ()) | |
7817 | mark_infrun_async_event_handler (); | |
c906108c | 7818 | } |
11cf8741 | 7819 | |
fd664c91 | 7820 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7821 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7822 | |
7823 | static void | |
bdc36728 | 7824 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7825 | { |
bdc36728 | 7826 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7827 | stop_waiting (ecs); |
fd664c91 PA |
7828 | } |
7829 | ||
33d62d64 JK |
7830 | /* Several print_*_reason functions to print why the inferior has stopped. |
7831 | We always print something when the inferior exits, or receives a signal. | |
7832 | The rest of the cases are dealt with later on in normal_stop and | |
7833 | print_it_typical. Ideally there should be a call to one of these | |
7834 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7835 | stop_waiting is called. |
33d62d64 | 7836 | |
fd664c91 PA |
7837 | Note that we don't call these directly, instead we delegate that to |
7838 | the interpreters, through observers. Interpreters then call these | |
7839 | with whatever uiout is right. */ | |
33d62d64 | 7840 | |
fd664c91 PA |
7841 | void |
7842 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7843 | { |
fd664c91 | 7844 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7845 | |
fd664c91 PA |
7846 | if (ui_out_is_mi_like_p (uiout)) |
7847 | { | |
7848 | ui_out_field_string (uiout, "reason", | |
7849 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
7850 | } | |
7851 | } | |
33d62d64 | 7852 | |
fd664c91 PA |
7853 | void |
7854 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7855 | { |
33d62d64 JK |
7856 | annotate_signalled (); |
7857 | if (ui_out_is_mi_like_p (uiout)) | |
7858 | ui_out_field_string | |
7859 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7860 | ui_out_text (uiout, "\nProgram terminated with signal "); | |
7861 | annotate_signal_name (); | |
7862 | ui_out_field_string (uiout, "signal-name", | |
2ea28649 | 7863 | gdb_signal_to_name (siggnal)); |
33d62d64 JK |
7864 | annotate_signal_name_end (); |
7865 | ui_out_text (uiout, ", "); | |
7866 | annotate_signal_string (); | |
7867 | ui_out_field_string (uiout, "signal-meaning", | |
2ea28649 | 7868 | gdb_signal_to_string (siggnal)); |
33d62d64 JK |
7869 | annotate_signal_string_end (); |
7870 | ui_out_text (uiout, ".\n"); | |
7871 | ui_out_text (uiout, "The program no longer exists.\n"); | |
7872 | } | |
7873 | ||
fd664c91 PA |
7874 | void |
7875 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7876 | { |
fda326dd TT |
7877 | struct inferior *inf = current_inferior (); |
7878 | const char *pidstr = target_pid_to_str (pid_to_ptid (inf->pid)); | |
7879 | ||
33d62d64 JK |
7880 | annotate_exited (exitstatus); |
7881 | if (exitstatus) | |
7882 | { | |
7883 | if (ui_out_is_mi_like_p (uiout)) | |
7884 | ui_out_field_string (uiout, "reason", | |
7885 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
fda326dd TT |
7886 | ui_out_text (uiout, "[Inferior "); |
7887 | ui_out_text (uiout, plongest (inf->num)); | |
7888 | ui_out_text (uiout, " ("); | |
7889 | ui_out_text (uiout, pidstr); | |
7890 | ui_out_text (uiout, ") exited with code "); | |
33d62d64 | 7891 | ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) exitstatus); |
fda326dd | 7892 | ui_out_text (uiout, "]\n"); |
33d62d64 JK |
7893 | } |
7894 | else | |
11cf8741 | 7895 | { |
9dc5e2a9 | 7896 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f | 7897 | ui_out_field_string |
33d62d64 | 7898 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); |
fda326dd TT |
7899 | ui_out_text (uiout, "[Inferior "); |
7900 | ui_out_text (uiout, plongest (inf->num)); | |
7901 | ui_out_text (uiout, " ("); | |
7902 | ui_out_text (uiout, pidstr); | |
7903 | ui_out_text (uiout, ") exited normally]\n"); | |
33d62d64 | 7904 | } |
33d62d64 JK |
7905 | } |
7906 | ||
fd664c91 PA |
7907 | void |
7908 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 7909 | { |
f303dbd6 PA |
7910 | struct thread_info *thr = inferior_thread (); |
7911 | ||
33d62d64 JK |
7912 | annotate_signal (); |
7913 | ||
f303dbd6 PA |
7914 | if (ui_out_is_mi_like_p (uiout)) |
7915 | ; | |
7916 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 7917 | { |
f303dbd6 | 7918 | const char *name; |
33d62d64 | 7919 | |
f303dbd6 PA |
7920 | ui_out_text (uiout, "\nThread "); |
7921 | ui_out_field_fmt (uiout, "thread-id", "%s", print_thread_id (thr)); | |
7922 | ||
7923 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
7924 | if (name != NULL) | |
7925 | { | |
7926 | ui_out_text (uiout, " \""); | |
7927 | ui_out_field_fmt (uiout, "name", "%s", name); | |
7928 | ui_out_text (uiout, "\""); | |
7929 | } | |
33d62d64 | 7930 | } |
f303dbd6 PA |
7931 | else |
7932 | ui_out_text (uiout, "\nProgram"); | |
7933 | ||
7934 | if (siggnal == GDB_SIGNAL_0 && !ui_out_is_mi_like_p (uiout)) | |
7935 | ui_out_text (uiout, " stopped"); | |
33d62d64 JK |
7936 | else |
7937 | { | |
f303dbd6 | 7938 | ui_out_text (uiout, " received signal "); |
8b93c638 | 7939 | annotate_signal_name (); |
33d62d64 JK |
7940 | if (ui_out_is_mi_like_p (uiout)) |
7941 | ui_out_field_string | |
7942 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b | 7943 | ui_out_field_string (uiout, "signal-name", |
2ea28649 | 7944 | gdb_signal_to_name (siggnal)); |
8b93c638 JM |
7945 | annotate_signal_name_end (); |
7946 | ui_out_text (uiout, ", "); | |
7947 | annotate_signal_string (); | |
488f131b | 7948 | ui_out_field_string (uiout, "signal-meaning", |
2ea28649 | 7949 | gdb_signal_to_string (siggnal)); |
8b93c638 | 7950 | annotate_signal_string_end (); |
33d62d64 JK |
7951 | } |
7952 | ui_out_text (uiout, ".\n"); | |
7953 | } | |
252fbfc8 | 7954 | |
fd664c91 PA |
7955 | void |
7956 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 7957 | { |
fd664c91 | 7958 | ui_out_text (uiout, "\nNo more reverse-execution history.\n"); |
11cf8741 | 7959 | } |
43ff13b4 | 7960 | |
0c7e1a46 PA |
7961 | /* Print current location without a level number, if we have changed |
7962 | functions or hit a breakpoint. Print source line if we have one. | |
7963 | bpstat_print contains the logic deciding in detail what to print, | |
7964 | based on the event(s) that just occurred. */ | |
7965 | ||
243a9253 PA |
7966 | static void |
7967 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
7968 | { |
7969 | int bpstat_ret; | |
f486487f | 7970 | enum print_what source_flag; |
0c7e1a46 PA |
7971 | int do_frame_printing = 1; |
7972 | struct thread_info *tp = inferior_thread (); | |
7973 | ||
7974 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
7975 | switch (bpstat_ret) | |
7976 | { | |
7977 | case PRINT_UNKNOWN: | |
7978 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
7979 | should) carry around the function and does (or should) use | |
7980 | that when doing a frame comparison. */ | |
7981 | if (tp->control.stop_step | |
7982 | && frame_id_eq (tp->control.step_frame_id, | |
7983 | get_frame_id (get_current_frame ())) | |
885eeb5b | 7984 | && tp->control.step_start_function == find_pc_function (stop_pc)) |
0c7e1a46 PA |
7985 | { |
7986 | /* Finished step, just print source line. */ | |
7987 | source_flag = SRC_LINE; | |
7988 | } | |
7989 | else | |
7990 | { | |
7991 | /* Print location and source line. */ | |
7992 | source_flag = SRC_AND_LOC; | |
7993 | } | |
7994 | break; | |
7995 | case PRINT_SRC_AND_LOC: | |
7996 | /* Print location and source line. */ | |
7997 | source_flag = SRC_AND_LOC; | |
7998 | break; | |
7999 | case PRINT_SRC_ONLY: | |
8000 | source_flag = SRC_LINE; | |
8001 | break; | |
8002 | case PRINT_NOTHING: | |
8003 | /* Something bogus. */ | |
8004 | source_flag = SRC_LINE; | |
8005 | do_frame_printing = 0; | |
8006 | break; | |
8007 | default: | |
8008 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8009 | } | |
8010 | ||
8011 | /* The behavior of this routine with respect to the source | |
8012 | flag is: | |
8013 | SRC_LINE: Print only source line | |
8014 | LOCATION: Print only location | |
8015 | SRC_AND_LOC: Print location and source line. */ | |
8016 | if (do_frame_printing) | |
8017 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8018 | } |
8019 | ||
8020 | /* Cleanup that restores a previous current uiout. */ | |
8021 | ||
8022 | static void | |
8023 | restore_current_uiout_cleanup (void *arg) | |
8024 | { | |
9a3c8263 | 8025 | struct ui_out *saved_uiout = (struct ui_out *) arg; |
243a9253 PA |
8026 | |
8027 | current_uiout = saved_uiout; | |
8028 | } | |
8029 | ||
8030 | /* See infrun.h. */ | |
8031 | ||
8032 | void | |
8033 | print_stop_event (struct ui_out *uiout) | |
8034 | { | |
8035 | struct cleanup *old_chain; | |
8036 | struct target_waitstatus last; | |
8037 | ptid_t last_ptid; | |
8038 | struct thread_info *tp; | |
8039 | ||
8040 | get_last_target_status (&last_ptid, &last); | |
8041 | ||
8042 | old_chain = make_cleanup (restore_current_uiout_cleanup, current_uiout); | |
8043 | current_uiout = uiout; | |
8044 | ||
8045 | print_stop_location (&last); | |
0c7e1a46 PA |
8046 | |
8047 | /* Display the auto-display expressions. */ | |
8048 | do_displays (); | |
243a9253 PA |
8049 | |
8050 | do_cleanups (old_chain); | |
8051 | ||
8052 | tp = inferior_thread (); | |
8053 | if (tp->thread_fsm != NULL | |
8054 | && thread_fsm_finished_p (tp->thread_fsm)) | |
8055 | { | |
8056 | struct return_value_info *rv; | |
8057 | ||
8058 | rv = thread_fsm_return_value (tp->thread_fsm); | |
8059 | if (rv != NULL) | |
8060 | print_return_value (uiout, rv); | |
8061 | } | |
0c7e1a46 PA |
8062 | } |
8063 | ||
388a7084 PA |
8064 | /* See infrun.h. */ |
8065 | ||
8066 | void | |
8067 | maybe_remove_breakpoints (void) | |
8068 | { | |
8069 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
8070 | { | |
8071 | if (remove_breakpoints ()) | |
8072 | { | |
8073 | target_terminal_ours_for_output (); | |
8074 | printf_filtered (_("Cannot remove breakpoints because " | |
8075 | "program is no longer writable.\nFurther " | |
8076 | "execution is probably impossible.\n")); | |
8077 | } | |
8078 | } | |
8079 | } | |
8080 | ||
4c2f2a79 PA |
8081 | /* The execution context that just caused a normal stop. */ |
8082 | ||
8083 | struct stop_context | |
8084 | { | |
8085 | /* The stop ID. */ | |
8086 | ULONGEST stop_id; | |
c906108c | 8087 | |
4c2f2a79 | 8088 | /* The event PTID. */ |
c906108c | 8089 | |
4c2f2a79 PA |
8090 | ptid_t ptid; |
8091 | ||
8092 | /* If stopp for a thread event, this is the thread that caused the | |
8093 | stop. */ | |
8094 | struct thread_info *thread; | |
8095 | ||
8096 | /* The inferior that caused the stop. */ | |
8097 | int inf_num; | |
8098 | }; | |
8099 | ||
8100 | /* Returns a new stop context. If stopped for a thread event, this | |
8101 | takes a strong reference to the thread. */ | |
8102 | ||
8103 | static struct stop_context * | |
8104 | save_stop_context (void) | |
8105 | { | |
224c3ddb | 8106 | struct stop_context *sc = XNEW (struct stop_context); |
4c2f2a79 PA |
8107 | |
8108 | sc->stop_id = get_stop_id (); | |
8109 | sc->ptid = inferior_ptid; | |
8110 | sc->inf_num = current_inferior ()->num; | |
8111 | ||
8112 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
8113 | { | |
8114 | /* Take a strong reference so that the thread can't be deleted | |
8115 | yet. */ | |
8116 | sc->thread = inferior_thread (); | |
8117 | sc->thread->refcount++; | |
8118 | } | |
8119 | else | |
8120 | sc->thread = NULL; | |
8121 | ||
8122 | return sc; | |
8123 | } | |
8124 | ||
8125 | /* Release a stop context previously created with save_stop_context. | |
8126 | Releases the strong reference to the thread as well. */ | |
8127 | ||
8128 | static void | |
8129 | release_stop_context_cleanup (void *arg) | |
8130 | { | |
9a3c8263 | 8131 | struct stop_context *sc = (struct stop_context *) arg; |
4c2f2a79 PA |
8132 | |
8133 | if (sc->thread != NULL) | |
8134 | sc->thread->refcount--; | |
8135 | xfree (sc); | |
8136 | } | |
8137 | ||
8138 | /* Return true if the current context no longer matches the saved stop | |
8139 | context. */ | |
8140 | ||
8141 | static int | |
8142 | stop_context_changed (struct stop_context *prev) | |
8143 | { | |
8144 | if (!ptid_equal (prev->ptid, inferior_ptid)) | |
8145 | return 1; | |
8146 | if (prev->inf_num != current_inferior ()->num) | |
8147 | return 1; | |
8148 | if (prev->thread != NULL && prev->thread->state != THREAD_STOPPED) | |
8149 | return 1; | |
8150 | if (get_stop_id () != prev->stop_id) | |
8151 | return 1; | |
8152 | return 0; | |
8153 | } | |
8154 | ||
8155 | /* See infrun.h. */ | |
8156 | ||
8157 | int | |
96baa820 | 8158 | normal_stop (void) |
c906108c | 8159 | { |
73b65bb0 DJ |
8160 | struct target_waitstatus last; |
8161 | ptid_t last_ptid; | |
29f49a6a | 8162 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
e1316e60 | 8163 | ptid_t pid_ptid; |
73b65bb0 DJ |
8164 | |
8165 | get_last_target_status (&last_ptid, &last); | |
8166 | ||
4c2f2a79 PA |
8167 | new_stop_id (); |
8168 | ||
29f49a6a PA |
8169 | /* If an exception is thrown from this point on, make sure to |
8170 | propagate GDB's knowledge of the executing state to the | |
8171 | frontend/user running state. A QUIT is an easy exception to see | |
8172 | here, so do this before any filtered output. */ | |
c35b1492 PA |
8173 | if (!non_stop) |
8174 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
e1316e60 PA |
8175 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8176 | || last.kind == TARGET_WAITKIND_EXITED) | |
8177 | { | |
8178 | /* On some targets, we may still have live threads in the | |
8179 | inferior when we get a process exit event. E.g., for | |
8180 | "checkpoint", when the current checkpoint/fork exits, | |
8181 | linux-fork.c automatically switches to another fork from | |
8182 | within target_mourn_inferior. */ | |
8183 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
8184 | { | |
8185 | pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
8186 | make_cleanup (finish_thread_state_cleanup, &pid_ptid); | |
8187 | } | |
8188 | } | |
8189 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c35b1492 | 8190 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); |
29f49a6a | 8191 | |
b57bacec PA |
8192 | /* As we're presenting a stop, and potentially removing breakpoints, |
8193 | update the thread list so we can tell whether there are threads | |
8194 | running on the target. With target remote, for example, we can | |
8195 | only learn about new threads when we explicitly update the thread | |
8196 | list. Do this before notifying the interpreters about signal | |
8197 | stops, end of stepping ranges, etc., so that the "new thread" | |
8198 | output is emitted before e.g., "Program received signal FOO", | |
8199 | instead of after. */ | |
8200 | update_thread_list (); | |
8201 | ||
8202 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
8203 | observer_notify_signal_received (inferior_thread ()->suspend.stop_signal); | |
8204 | ||
c906108c SS |
8205 | /* As with the notification of thread events, we want to delay |
8206 | notifying the user that we've switched thread context until | |
8207 | the inferior actually stops. | |
8208 | ||
73b65bb0 DJ |
8209 | There's no point in saying anything if the inferior has exited. |
8210 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8211 | "received a signal". |
8212 | ||
8213 | Also skip saying anything in non-stop mode. In that mode, as we | |
8214 | don't want GDB to switch threads behind the user's back, to avoid | |
8215 | races where the user is typing a command to apply to thread x, | |
8216 | but GDB switches to thread y before the user finishes entering | |
8217 | the command, fetch_inferior_event installs a cleanup to restore | |
8218 | the current thread back to the thread the user had selected right | |
8219 | after this event is handled, so we're not really switching, only | |
8220 | informing of a stop. */ | |
4f8d22e3 PA |
8221 | if (!non_stop |
8222 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
8223 | && target_has_execution |
8224 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8225 | && last.kind != TARGET_WAITKIND_EXITED |
8226 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c SS |
8227 | { |
8228 | target_terminal_ours_for_output (); | |
a3f17187 | 8229 | printf_filtered (_("[Switching to %s]\n"), |
c95310c6 | 8230 | target_pid_to_str (inferior_ptid)); |
b8fa951a | 8231 | annotate_thread_changed (); |
39f77062 | 8232 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8233 | } |
c906108c | 8234 | |
0e5bf2a8 PA |
8235 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8236 | { | |
8237 | gdb_assert (sync_execution || !target_can_async_p ()); | |
8238 | ||
8239 | target_terminal_ours_for_output (); | |
8240 | printf_filtered (_("No unwaited-for children left.\n")); | |
8241 | } | |
8242 | ||
b57bacec | 8243 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8244 | maybe_remove_breakpoints (); |
c906108c | 8245 | |
c906108c SS |
8246 | /* If an auto-display called a function and that got a signal, |
8247 | delete that auto-display to avoid an infinite recursion. */ | |
8248 | ||
8249 | if (stopped_by_random_signal) | |
8250 | disable_current_display (); | |
8251 | ||
c906108c | 8252 | target_terminal_ours (); |
0f641c01 | 8253 | async_enable_stdin (); |
c906108c | 8254 | |
388a7084 PA |
8255 | /* Let the user/frontend see the threads as stopped. */ |
8256 | do_cleanups (old_chain); | |
8257 | ||
8258 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8259 | and current location is based on that. Handle the case where the | |
8260 | dummy call is returning after being stopped. E.g. the dummy call | |
8261 | previously hit a breakpoint. (If the dummy call returns | |
8262 | normally, we won't reach here.) Do this before the stop hook is | |
8263 | run, so that it doesn't get to see the temporary dummy frame, | |
8264 | which is not where we'll present the stop. */ | |
8265 | if (has_stack_frames ()) | |
8266 | { | |
8267 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8268 | { | |
8269 | /* Pop the empty frame that contains the stack dummy. This | |
8270 | also restores inferior state prior to the call (struct | |
8271 | infcall_suspend_state). */ | |
8272 | struct frame_info *frame = get_current_frame (); | |
8273 | ||
8274 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8275 | frame_pop (frame); | |
8276 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8277 | does which means there's now no selected frame. */ | |
8278 | } | |
8279 | ||
8280 | select_frame (get_current_frame ()); | |
8281 | ||
8282 | /* Set the current source location. */ | |
8283 | set_current_sal_from_frame (get_current_frame ()); | |
8284 | } | |
dd7e2d2b PA |
8285 | |
8286 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8287 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8288 | if (stop_command != NULL) |
8289 | { | |
8290 | struct stop_context *saved_context = save_stop_context (); | |
8291 | struct cleanup *old_chain | |
8292 | = make_cleanup (release_stop_context_cleanup, saved_context); | |
8293 | ||
8294 | catch_errors (hook_stop_stub, stop_command, | |
8295 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
8296 | ||
8297 | /* If the stop hook resumes the target, then there's no point in | |
8298 | trying to notify about the previous stop; its context is | |
8299 | gone. Likewise if the command switches thread or inferior -- | |
8300 | the observers would print a stop for the wrong | |
8301 | thread/inferior. */ | |
8302 | if (stop_context_changed (saved_context)) | |
8303 | { | |
8304 | do_cleanups (old_chain); | |
8305 | return 1; | |
8306 | } | |
8307 | do_cleanups (old_chain); | |
8308 | } | |
dd7e2d2b | 8309 | |
388a7084 PA |
8310 | /* Notify observers about the stop. This is where the interpreters |
8311 | print the stop event. */ | |
8312 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
8313 | observer_notify_normal_stop (inferior_thread ()->control.stop_bpstat, | |
8314 | stop_print_frame); | |
8315 | else | |
8316 | observer_notify_normal_stop (NULL, stop_print_frame); | |
347bddb7 | 8317 | |
243a9253 PA |
8318 | annotate_stopped (); |
8319 | ||
48844aa6 PA |
8320 | if (target_has_execution) |
8321 | { | |
8322 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
8323 | && last.kind != TARGET_WAITKIND_EXITED) | |
8324 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
8325 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8326 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8327 | } |
6c95b8df PA |
8328 | |
8329 | /* Try to get rid of automatically added inferiors that are no | |
8330 | longer needed. Keeping those around slows down things linearly. | |
8331 | Note that this never removes the current inferior. */ | |
8332 | prune_inferiors (); | |
4c2f2a79 PA |
8333 | |
8334 | return 0; | |
c906108c SS |
8335 | } |
8336 | ||
8337 | static int | |
96baa820 | 8338 | hook_stop_stub (void *cmd) |
c906108c | 8339 | { |
5913bcb0 | 8340 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
8341 | return (0); |
8342 | } | |
8343 | \f | |
c5aa993b | 8344 | int |
96baa820 | 8345 | signal_stop_state (int signo) |
c906108c | 8346 | { |
d6b48e9c | 8347 | return signal_stop[signo]; |
c906108c SS |
8348 | } |
8349 | ||
c5aa993b | 8350 | int |
96baa820 | 8351 | signal_print_state (int signo) |
c906108c SS |
8352 | { |
8353 | return signal_print[signo]; | |
8354 | } | |
8355 | ||
c5aa993b | 8356 | int |
96baa820 | 8357 | signal_pass_state (int signo) |
c906108c SS |
8358 | { |
8359 | return signal_program[signo]; | |
8360 | } | |
8361 | ||
2455069d UW |
8362 | static void |
8363 | signal_cache_update (int signo) | |
8364 | { | |
8365 | if (signo == -1) | |
8366 | { | |
a493e3e2 | 8367 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8368 | signal_cache_update (signo); |
8369 | ||
8370 | return; | |
8371 | } | |
8372 | ||
8373 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8374 | && signal_print[signo] == 0 | |
ab04a2af TT |
8375 | && signal_program[signo] == 1 |
8376 | && signal_catch[signo] == 0); | |
2455069d UW |
8377 | } |
8378 | ||
488f131b | 8379 | int |
7bda5e4a | 8380 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8381 | { |
8382 | int ret = signal_stop[signo]; | |
abbb1732 | 8383 | |
d4f3574e | 8384 | signal_stop[signo] = state; |
2455069d | 8385 | signal_cache_update (signo); |
d4f3574e SS |
8386 | return ret; |
8387 | } | |
8388 | ||
488f131b | 8389 | int |
7bda5e4a | 8390 | signal_print_update (int signo, int state) |
d4f3574e SS |
8391 | { |
8392 | int ret = signal_print[signo]; | |
abbb1732 | 8393 | |
d4f3574e | 8394 | signal_print[signo] = state; |
2455069d | 8395 | signal_cache_update (signo); |
d4f3574e SS |
8396 | return ret; |
8397 | } | |
8398 | ||
488f131b | 8399 | int |
7bda5e4a | 8400 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8401 | { |
8402 | int ret = signal_program[signo]; | |
abbb1732 | 8403 | |
d4f3574e | 8404 | signal_program[signo] = state; |
2455069d | 8405 | signal_cache_update (signo); |
d4f3574e SS |
8406 | return ret; |
8407 | } | |
8408 | ||
ab04a2af TT |
8409 | /* Update the global 'signal_catch' from INFO and notify the |
8410 | target. */ | |
8411 | ||
8412 | void | |
8413 | signal_catch_update (const unsigned int *info) | |
8414 | { | |
8415 | int i; | |
8416 | ||
8417 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8418 | signal_catch[i] = info[i] > 0; | |
8419 | signal_cache_update (-1); | |
8420 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
8421 | } | |
8422 | ||
c906108c | 8423 | static void |
96baa820 | 8424 | sig_print_header (void) |
c906108c | 8425 | { |
3e43a32a MS |
8426 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8427 | "to program\tDescription\n")); | |
c906108c SS |
8428 | } |
8429 | ||
8430 | static void | |
2ea28649 | 8431 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8432 | { |
2ea28649 | 8433 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8434 | int name_padding = 13 - strlen (name); |
96baa820 | 8435 | |
c906108c SS |
8436 | if (name_padding <= 0) |
8437 | name_padding = 0; | |
8438 | ||
8439 | printf_filtered ("%s", name); | |
488f131b | 8440 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8441 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8442 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8443 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8444 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8445 | } |
8446 | ||
8447 | /* Specify how various signals in the inferior should be handled. */ | |
8448 | ||
8449 | static void | |
96baa820 | 8450 | handle_command (char *args, int from_tty) |
c906108c SS |
8451 | { |
8452 | char **argv; | |
8453 | int digits, wordlen; | |
8454 | int sigfirst, signum, siglast; | |
2ea28649 | 8455 | enum gdb_signal oursig; |
c906108c SS |
8456 | int allsigs; |
8457 | int nsigs; | |
8458 | unsigned char *sigs; | |
8459 | struct cleanup *old_chain; | |
8460 | ||
8461 | if (args == NULL) | |
8462 | { | |
e2e0b3e5 | 8463 | error_no_arg (_("signal to handle")); |
c906108c SS |
8464 | } |
8465 | ||
1777feb0 | 8466 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8467 | |
a493e3e2 | 8468 | nsigs = (int) GDB_SIGNAL_LAST; |
c906108c SS |
8469 | sigs = (unsigned char *) alloca (nsigs); |
8470 | memset (sigs, 0, nsigs); | |
8471 | ||
1777feb0 | 8472 | /* Break the command line up into args. */ |
c906108c | 8473 | |
d1a41061 | 8474 | argv = gdb_buildargv (args); |
7a292a7a | 8475 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
8476 | |
8477 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8478 | actions. Signal numbers and signal names may be interspersed with | |
8479 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8480 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c SS |
8481 | |
8482 | while (*argv != NULL) | |
8483 | { | |
8484 | wordlen = strlen (*argv); | |
8485 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
8486 | {; | |
8487 | } | |
8488 | allsigs = 0; | |
8489 | sigfirst = siglast = -1; | |
8490 | ||
8491 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
8492 | { | |
8493 | /* Apply action to all signals except those used by the | |
1777feb0 | 8494 | debugger. Silently skip those. */ |
c906108c SS |
8495 | allsigs = 1; |
8496 | sigfirst = 0; | |
8497 | siglast = nsigs - 1; | |
8498 | } | |
8499 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
8500 | { | |
8501 | SET_SIGS (nsigs, sigs, signal_stop); | |
8502 | SET_SIGS (nsigs, sigs, signal_print); | |
8503 | } | |
8504 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
8505 | { | |
8506 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8507 | } | |
8508 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
8509 | { | |
8510 | SET_SIGS (nsigs, sigs, signal_print); | |
8511 | } | |
8512 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
8513 | { | |
8514 | SET_SIGS (nsigs, sigs, signal_program); | |
8515 | } | |
8516 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
8517 | { | |
8518 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8519 | } | |
8520 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
8521 | { | |
8522 | SET_SIGS (nsigs, sigs, signal_program); | |
8523 | } | |
8524 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
8525 | { | |
8526 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8527 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8528 | } | |
8529 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
8530 | { | |
8531 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8532 | } | |
8533 | else if (digits > 0) | |
8534 | { | |
8535 | /* It is numeric. The numeric signal refers to our own | |
8536 | internal signal numbering from target.h, not to host/target | |
8537 | signal number. This is a feature; users really should be | |
8538 | using symbolic names anyway, and the common ones like | |
8539 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8540 | ||
8541 | sigfirst = siglast = (int) | |
2ea28649 | 8542 | gdb_signal_from_command (atoi (*argv)); |
c906108c SS |
8543 | if ((*argv)[digits] == '-') |
8544 | { | |
8545 | siglast = (int) | |
2ea28649 | 8546 | gdb_signal_from_command (atoi ((*argv) + digits + 1)); |
c906108c SS |
8547 | } |
8548 | if (sigfirst > siglast) | |
8549 | { | |
1777feb0 | 8550 | /* Bet he didn't figure we'd think of this case... */ |
c906108c SS |
8551 | signum = sigfirst; |
8552 | sigfirst = siglast; | |
8553 | siglast = signum; | |
8554 | } | |
8555 | } | |
8556 | else | |
8557 | { | |
2ea28649 | 8558 | oursig = gdb_signal_from_name (*argv); |
a493e3e2 | 8559 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8560 | { |
8561 | sigfirst = siglast = (int) oursig; | |
8562 | } | |
8563 | else | |
8564 | { | |
8565 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 8566 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
8567 | } |
8568 | } | |
8569 | ||
8570 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8571 | which signals to apply actions to. */ |
c906108c SS |
8572 | |
8573 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
8574 | { | |
2ea28649 | 8575 | switch ((enum gdb_signal) signum) |
c906108c | 8576 | { |
a493e3e2 PA |
8577 | case GDB_SIGNAL_TRAP: |
8578 | case GDB_SIGNAL_INT: | |
c906108c SS |
8579 | if (!allsigs && !sigs[signum]) |
8580 | { | |
9e2f0ad4 | 8581 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8582 | Are you sure you want to change it? "), |
2ea28649 | 8583 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8584 | { |
8585 | sigs[signum] = 1; | |
8586 | } | |
8587 | else | |
8588 | { | |
a3f17187 | 8589 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8590 | gdb_flush (gdb_stdout); |
8591 | } | |
8592 | } | |
8593 | break; | |
a493e3e2 PA |
8594 | case GDB_SIGNAL_0: |
8595 | case GDB_SIGNAL_DEFAULT: | |
8596 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8597 | /* Make sure that "all" doesn't print these. */ |
8598 | break; | |
8599 | default: | |
8600 | sigs[signum] = 1; | |
8601 | break; | |
8602 | } | |
8603 | } | |
8604 | ||
8605 | argv++; | |
8606 | } | |
8607 | ||
3a031f65 PA |
8608 | for (signum = 0; signum < nsigs; signum++) |
8609 | if (sigs[signum]) | |
8610 | { | |
2455069d | 8611 | signal_cache_update (-1); |
a493e3e2 PA |
8612 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); |
8613 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); | |
c906108c | 8614 | |
3a031f65 PA |
8615 | if (from_tty) |
8616 | { | |
8617 | /* Show the results. */ | |
8618 | sig_print_header (); | |
8619 | for (; signum < nsigs; signum++) | |
8620 | if (sigs[signum]) | |
aead7601 | 8621 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8622 | } |
8623 | ||
8624 | break; | |
8625 | } | |
c906108c SS |
8626 | |
8627 | do_cleanups (old_chain); | |
8628 | } | |
8629 | ||
de0bea00 MF |
8630 | /* Complete the "handle" command. */ |
8631 | ||
8632 | static VEC (char_ptr) * | |
8633 | handle_completer (struct cmd_list_element *ignore, | |
6f937416 | 8634 | const char *text, const char *word) |
de0bea00 MF |
8635 | { |
8636 | VEC (char_ptr) *vec_signals, *vec_keywords, *return_val; | |
8637 | static const char * const keywords[] = | |
8638 | { | |
8639 | "all", | |
8640 | "stop", | |
8641 | "ignore", | |
8642 | "print", | |
8643 | "pass", | |
8644 | "nostop", | |
8645 | "noignore", | |
8646 | "noprint", | |
8647 | "nopass", | |
8648 | NULL, | |
8649 | }; | |
8650 | ||
8651 | vec_signals = signal_completer (ignore, text, word); | |
8652 | vec_keywords = complete_on_enum (keywords, word, word); | |
8653 | ||
8654 | return_val = VEC_merge (char_ptr, vec_signals, vec_keywords); | |
8655 | VEC_free (char_ptr, vec_signals); | |
8656 | VEC_free (char_ptr, vec_keywords); | |
8657 | return return_val; | |
8658 | } | |
8659 | ||
2ea28649 PA |
8660 | enum gdb_signal |
8661 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8662 | { |
8663 | if (num >= 1 && num <= 15) | |
2ea28649 | 8664 | return (enum gdb_signal) num; |
ed01b82c PA |
8665 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8666 | Use \"info signals\" for a list of symbolic signals.")); | |
8667 | } | |
8668 | ||
c906108c SS |
8669 | /* Print current contents of the tables set by the handle command. |
8670 | It is possible we should just be printing signals actually used | |
8671 | by the current target (but for things to work right when switching | |
8672 | targets, all signals should be in the signal tables). */ | |
8673 | ||
8674 | static void | |
96baa820 | 8675 | signals_info (char *signum_exp, int from_tty) |
c906108c | 8676 | { |
2ea28649 | 8677 | enum gdb_signal oursig; |
abbb1732 | 8678 | |
c906108c SS |
8679 | sig_print_header (); |
8680 | ||
8681 | if (signum_exp) | |
8682 | { | |
8683 | /* First see if this is a symbol name. */ | |
2ea28649 | 8684 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8685 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8686 | { |
8687 | /* No, try numeric. */ | |
8688 | oursig = | |
2ea28649 | 8689 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8690 | } |
8691 | sig_print_info (oursig); | |
8692 | return; | |
8693 | } | |
8694 | ||
8695 | printf_filtered ("\n"); | |
8696 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8697 | for (oursig = GDB_SIGNAL_FIRST; |
8698 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8699 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8700 | { |
8701 | QUIT; | |
8702 | ||
a493e3e2 PA |
8703 | if (oursig != GDB_SIGNAL_UNKNOWN |
8704 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8705 | sig_print_info (oursig); |
8706 | } | |
8707 | ||
3e43a32a MS |
8708 | printf_filtered (_("\nUse the \"handle\" command " |
8709 | "to change these tables.\n")); | |
c906108c | 8710 | } |
4aa995e1 PA |
8711 | |
8712 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8713 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8714 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8715 | also dependent on which thread you have selected. |
8716 | ||
8717 | 1. making $_siginfo be an internalvar that creates a new value on | |
8718 | access. | |
8719 | ||
8720 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8721 | ||
8722 | /* This function implements the lval_computed support for reading a | |
8723 | $_siginfo value. */ | |
8724 | ||
8725 | static void | |
8726 | siginfo_value_read (struct value *v) | |
8727 | { | |
8728 | LONGEST transferred; | |
8729 | ||
a911d87a PA |
8730 | /* If we can access registers, so can we access $_siginfo. Likewise |
8731 | vice versa. */ | |
8732 | validate_registers_access (); | |
c709acd1 | 8733 | |
4aa995e1 PA |
8734 | transferred = |
8735 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
8736 | NULL, | |
8737 | value_contents_all_raw (v), | |
8738 | value_offset (v), | |
8739 | TYPE_LENGTH (value_type (v))); | |
8740 | ||
8741 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8742 | error (_("Unable to read siginfo")); | |
8743 | } | |
8744 | ||
8745 | /* This function implements the lval_computed support for writing a | |
8746 | $_siginfo value. */ | |
8747 | ||
8748 | static void | |
8749 | siginfo_value_write (struct value *v, struct value *fromval) | |
8750 | { | |
8751 | LONGEST transferred; | |
8752 | ||
a911d87a PA |
8753 | /* If we can access registers, so can we access $_siginfo. Likewise |
8754 | vice versa. */ | |
8755 | validate_registers_access (); | |
c709acd1 | 8756 | |
4aa995e1 PA |
8757 | transferred = target_write (¤t_target, |
8758 | TARGET_OBJECT_SIGNAL_INFO, | |
8759 | NULL, | |
8760 | value_contents_all_raw (fromval), | |
8761 | value_offset (v), | |
8762 | TYPE_LENGTH (value_type (fromval))); | |
8763 | ||
8764 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8765 | error (_("Unable to write siginfo")); | |
8766 | } | |
8767 | ||
c8f2448a | 8768 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8769 | { |
8770 | siginfo_value_read, | |
8771 | siginfo_value_write | |
8772 | }; | |
8773 | ||
8774 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8775 | the current thread using architecture GDBARCH. Return a void value |
8776 | if there's no object available. */ | |
4aa995e1 | 8777 | |
2c0b251b | 8778 | static struct value * |
22d2b532 SDJ |
8779 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8780 | void *ignore) | |
4aa995e1 | 8781 | { |
4aa995e1 | 8782 | if (target_has_stack |
78267919 UW |
8783 | && !ptid_equal (inferior_ptid, null_ptid) |
8784 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
4aa995e1 | 8785 | { |
78267919 | 8786 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8787 | |
78267919 | 8788 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8789 | } |
8790 | ||
78267919 | 8791 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8792 | } |
8793 | ||
c906108c | 8794 | \f |
16c381f0 JK |
8795 | /* infcall_suspend_state contains state about the program itself like its |
8796 | registers and any signal it received when it last stopped. | |
8797 | This state must be restored regardless of how the inferior function call | |
8798 | ends (either successfully, or after it hits a breakpoint or signal) | |
8799 | if the program is to properly continue where it left off. */ | |
8800 | ||
8801 | struct infcall_suspend_state | |
7a292a7a | 8802 | { |
16c381f0 | 8803 | struct thread_suspend_state thread_suspend; |
16c381f0 JK |
8804 | |
8805 | /* Other fields: */ | |
7a292a7a | 8806 | CORE_ADDR stop_pc; |
b89667eb | 8807 | struct regcache *registers; |
1736ad11 | 8808 | |
35515841 | 8809 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
1736ad11 JK |
8810 | struct gdbarch *siginfo_gdbarch; |
8811 | ||
8812 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8813 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8814 | content would be invalid. */ | |
8815 | gdb_byte *siginfo_data; | |
b89667eb DE |
8816 | }; |
8817 | ||
16c381f0 JK |
8818 | struct infcall_suspend_state * |
8819 | save_infcall_suspend_state (void) | |
b89667eb | 8820 | { |
16c381f0 | 8821 | struct infcall_suspend_state *inf_state; |
b89667eb | 8822 | struct thread_info *tp = inferior_thread (); |
1736ad11 JK |
8823 | struct regcache *regcache = get_current_regcache (); |
8824 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
8825 | gdb_byte *siginfo_data = NULL; | |
8826 | ||
8827 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8828 | { | |
8829 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8830 | size_t len = TYPE_LENGTH (type); | |
8831 | struct cleanup *back_to; | |
8832 | ||
224c3ddb | 8833 | siginfo_data = (gdb_byte *) xmalloc (len); |
1736ad11 JK |
8834 | back_to = make_cleanup (xfree, siginfo_data); |
8835 | ||
8836 | if (target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8837 | siginfo_data, 0, len) == len) | |
8838 | discard_cleanups (back_to); | |
8839 | else | |
8840 | { | |
8841 | /* Errors ignored. */ | |
8842 | do_cleanups (back_to); | |
8843 | siginfo_data = NULL; | |
8844 | } | |
8845 | } | |
8846 | ||
41bf6aca | 8847 | inf_state = XCNEW (struct infcall_suspend_state); |
1736ad11 JK |
8848 | |
8849 | if (siginfo_data) | |
8850 | { | |
8851 | inf_state->siginfo_gdbarch = gdbarch; | |
8852 | inf_state->siginfo_data = siginfo_data; | |
8853 | } | |
b89667eb | 8854 | |
16c381f0 | 8855 | inf_state->thread_suspend = tp->suspend; |
16c381f0 | 8856 | |
35515841 | 8857 | /* run_inferior_call will not use the signal due to its `proceed' call with |
a493e3e2 PA |
8858 | GDB_SIGNAL_0 anyway. */ |
8859 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
35515841 | 8860 | |
b89667eb DE |
8861 | inf_state->stop_pc = stop_pc; |
8862 | ||
1736ad11 | 8863 | inf_state->registers = regcache_dup (regcache); |
b89667eb DE |
8864 | |
8865 | return inf_state; | |
8866 | } | |
8867 | ||
8868 | /* Restore inferior session state to INF_STATE. */ | |
8869 | ||
8870 | void | |
16c381f0 | 8871 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8872 | { |
8873 | struct thread_info *tp = inferior_thread (); | |
1736ad11 JK |
8874 | struct regcache *regcache = get_current_regcache (); |
8875 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
b89667eb | 8876 | |
16c381f0 | 8877 | tp->suspend = inf_state->thread_suspend; |
16c381f0 | 8878 | |
b89667eb DE |
8879 | stop_pc = inf_state->stop_pc; |
8880 | ||
1736ad11 JK |
8881 | if (inf_state->siginfo_gdbarch == gdbarch) |
8882 | { | |
8883 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
1736ad11 JK |
8884 | |
8885 | /* Errors ignored. */ | |
8886 | target_write (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6acef6cd | 8887 | inf_state->siginfo_data, 0, TYPE_LENGTH (type)); |
1736ad11 JK |
8888 | } |
8889 | ||
b89667eb DE |
8890 | /* The inferior can be gone if the user types "print exit(0)" |
8891 | (and perhaps other times). */ | |
8892 | if (target_has_execution) | |
8893 | /* NB: The register write goes through to the target. */ | |
1736ad11 | 8894 | regcache_cpy (regcache, inf_state->registers); |
803b5f95 | 8895 | |
16c381f0 | 8896 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8897 | } |
8898 | ||
8899 | static void | |
16c381f0 | 8900 | do_restore_infcall_suspend_state_cleanup (void *state) |
b89667eb | 8901 | { |
9a3c8263 | 8902 | restore_infcall_suspend_state ((struct infcall_suspend_state *) state); |
b89667eb DE |
8903 | } |
8904 | ||
8905 | struct cleanup * | |
16c381f0 JK |
8906 | make_cleanup_restore_infcall_suspend_state |
8907 | (struct infcall_suspend_state *inf_state) | |
b89667eb | 8908 | { |
16c381f0 | 8909 | return make_cleanup (do_restore_infcall_suspend_state_cleanup, inf_state); |
b89667eb DE |
8910 | } |
8911 | ||
8912 | void | |
16c381f0 | 8913 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8914 | { |
8915 | regcache_xfree (inf_state->registers); | |
803b5f95 | 8916 | xfree (inf_state->siginfo_data); |
b89667eb DE |
8917 | xfree (inf_state); |
8918 | } | |
8919 | ||
8920 | struct regcache * | |
16c381f0 | 8921 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8922 | { |
8923 | return inf_state->registers; | |
8924 | } | |
8925 | ||
16c381f0 JK |
8926 | /* infcall_control_state contains state regarding gdb's control of the |
8927 | inferior itself like stepping control. It also contains session state like | |
8928 | the user's currently selected frame. */ | |
b89667eb | 8929 | |
16c381f0 | 8930 | struct infcall_control_state |
b89667eb | 8931 | { |
16c381f0 JK |
8932 | struct thread_control_state thread_control; |
8933 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
8934 | |
8935 | /* Other fields: */ | |
8936 | enum stop_stack_kind stop_stack_dummy; | |
8937 | int stopped_by_random_signal; | |
7a292a7a | 8938 | |
b89667eb | 8939 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe | 8940 | struct frame_id selected_frame_id; |
7a292a7a SS |
8941 | }; |
8942 | ||
c906108c | 8943 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 8944 | connection. */ |
c906108c | 8945 | |
16c381f0 JK |
8946 | struct infcall_control_state * |
8947 | save_infcall_control_state (void) | |
c906108c | 8948 | { |
8d749320 SM |
8949 | struct infcall_control_state *inf_status = |
8950 | XNEW (struct infcall_control_state); | |
4e1c45ea | 8951 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8952 | struct inferior *inf = current_inferior (); |
7a292a7a | 8953 | |
16c381f0 JK |
8954 | inf_status->thread_control = tp->control; |
8955 | inf_status->inferior_control = inf->control; | |
d82142e2 | 8956 | |
8358c15c | 8957 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 8958 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 8959 | |
16c381f0 JK |
8960 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
8961 | chain. If caller's caller is walking the chain, they'll be happier if we | |
8962 | hand them back the original chain when restore_infcall_control_state is | |
8963 | called. */ | |
8964 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
8965 | |
8966 | /* Other fields: */ | |
8967 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
8968 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 8969 | |
206415a3 | 8970 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 8971 | |
7a292a7a | 8972 | return inf_status; |
c906108c SS |
8973 | } |
8974 | ||
c906108c | 8975 | static int |
96baa820 | 8976 | restore_selected_frame (void *args) |
c906108c | 8977 | { |
488f131b | 8978 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 8979 | struct frame_info *frame; |
c906108c | 8980 | |
101dcfbe | 8981 | frame = frame_find_by_id (*fid); |
c906108c | 8982 | |
aa0cd9c1 AC |
8983 | /* If inf_status->selected_frame_id is NULL, there was no previously |
8984 | selected frame. */ | |
101dcfbe | 8985 | if (frame == NULL) |
c906108c | 8986 | { |
8a3fe4f8 | 8987 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
8988 | return 0; |
8989 | } | |
8990 | ||
0f7d239c | 8991 | select_frame (frame); |
c906108c SS |
8992 | |
8993 | return (1); | |
8994 | } | |
8995 | ||
b89667eb DE |
8996 | /* Restore inferior session state to INF_STATUS. */ |
8997 | ||
c906108c | 8998 | void |
16c381f0 | 8999 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9000 | { |
4e1c45ea | 9001 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9002 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9003 | |
8358c15c JK |
9004 | if (tp->control.step_resume_breakpoint) |
9005 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9006 | ||
5b79abe7 TT |
9007 | if (tp->control.exception_resume_breakpoint) |
9008 | tp->control.exception_resume_breakpoint->disposition | |
9009 | = disp_del_at_next_stop; | |
9010 | ||
d82142e2 | 9011 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9012 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9013 | |
16c381f0 JK |
9014 | tp->control = inf_status->thread_control; |
9015 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9016 | |
9017 | /* Other fields: */ | |
9018 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9019 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9020 | |
b89667eb | 9021 | if (target_has_stack) |
c906108c | 9022 | { |
c906108c | 9023 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
9024 | walking the stack might encounter a garbage pointer and |
9025 | error() trying to dereference it. */ | |
488f131b JB |
9026 | if (catch_errors |
9027 | (restore_selected_frame, &inf_status->selected_frame_id, | |
9028 | "Unable to restore previously selected frame:\n", | |
9029 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
9030 | /* Error in restoring the selected frame. Select the innermost |
9031 | frame. */ | |
0f7d239c | 9032 | select_frame (get_current_frame ()); |
c906108c | 9033 | } |
c906108c | 9034 | |
72cec141 | 9035 | xfree (inf_status); |
7a292a7a | 9036 | } |
c906108c | 9037 | |
74b7792f | 9038 | static void |
16c381f0 | 9039 | do_restore_infcall_control_state_cleanup (void *sts) |
74b7792f | 9040 | { |
9a3c8263 | 9041 | restore_infcall_control_state ((struct infcall_control_state *) sts); |
74b7792f AC |
9042 | } |
9043 | ||
9044 | struct cleanup * | |
16c381f0 JK |
9045 | make_cleanup_restore_infcall_control_state |
9046 | (struct infcall_control_state *inf_status) | |
74b7792f | 9047 | { |
16c381f0 | 9048 | return make_cleanup (do_restore_infcall_control_state_cleanup, inf_status); |
74b7792f AC |
9049 | } |
9050 | ||
c906108c | 9051 | void |
16c381f0 | 9052 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9053 | { |
8358c15c JK |
9054 | if (inf_status->thread_control.step_resume_breakpoint) |
9055 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9056 | = disp_del_at_next_stop; | |
9057 | ||
5b79abe7 TT |
9058 | if (inf_status->thread_control.exception_resume_breakpoint) |
9059 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9060 | = disp_del_at_next_stop; | |
9061 | ||
1777feb0 | 9062 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9063 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9064 | |
72cec141 | 9065 | xfree (inf_status); |
7a292a7a | 9066 | } |
b89667eb | 9067 | \f |
ca6724c1 KB |
9068 | /* restore_inferior_ptid() will be used by the cleanup machinery |
9069 | to restore the inferior_ptid value saved in a call to | |
9070 | save_inferior_ptid(). */ | |
ce696e05 KB |
9071 | |
9072 | static void | |
9073 | restore_inferior_ptid (void *arg) | |
9074 | { | |
9a3c8263 | 9075 | ptid_t *saved_ptid_ptr = (ptid_t *) arg; |
abbb1732 | 9076 | |
ce696e05 KB |
9077 | inferior_ptid = *saved_ptid_ptr; |
9078 | xfree (arg); | |
9079 | } | |
9080 | ||
9081 | /* Save the value of inferior_ptid so that it may be restored by a | |
9082 | later call to do_cleanups(). Returns the struct cleanup pointer | |
9083 | needed for later doing the cleanup. */ | |
9084 | ||
9085 | struct cleanup * | |
9086 | save_inferior_ptid (void) | |
9087 | { | |
8d749320 | 9088 | ptid_t *saved_ptid_ptr = XNEW (ptid_t); |
ce696e05 | 9089 | |
ce696e05 KB |
9090 | *saved_ptid_ptr = inferior_ptid; |
9091 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
9092 | } | |
0c557179 | 9093 | |
7f89fd65 | 9094 | /* See infrun.h. */ |
0c557179 SDJ |
9095 | |
9096 | void | |
9097 | clear_exit_convenience_vars (void) | |
9098 | { | |
9099 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9100 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9101 | } | |
c5aa993b | 9102 | \f |
488f131b | 9103 | |
b2175913 MS |
9104 | /* User interface for reverse debugging: |
9105 | Set exec-direction / show exec-direction commands | |
9106 | (returns error unless target implements to_set_exec_direction method). */ | |
9107 | ||
170742de | 9108 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9109 | static const char exec_forward[] = "forward"; |
9110 | static const char exec_reverse[] = "reverse"; | |
9111 | static const char *exec_direction = exec_forward; | |
40478521 | 9112 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9113 | exec_forward, |
9114 | exec_reverse, | |
9115 | NULL | |
9116 | }; | |
9117 | ||
9118 | static void | |
9119 | set_exec_direction_func (char *args, int from_tty, | |
9120 | struct cmd_list_element *cmd) | |
9121 | { | |
9122 | if (target_can_execute_reverse) | |
9123 | { | |
9124 | if (!strcmp (exec_direction, exec_forward)) | |
9125 | execution_direction = EXEC_FORWARD; | |
9126 | else if (!strcmp (exec_direction, exec_reverse)) | |
9127 | execution_direction = EXEC_REVERSE; | |
9128 | } | |
8bbed405 MS |
9129 | else |
9130 | { | |
9131 | exec_direction = exec_forward; | |
9132 | error (_("Target does not support this operation.")); | |
9133 | } | |
b2175913 MS |
9134 | } |
9135 | ||
9136 | static void | |
9137 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9138 | struct cmd_list_element *cmd, const char *value) | |
9139 | { | |
9140 | switch (execution_direction) { | |
9141 | case EXEC_FORWARD: | |
9142 | fprintf_filtered (out, _("Forward.\n")); | |
9143 | break; | |
9144 | case EXEC_REVERSE: | |
9145 | fprintf_filtered (out, _("Reverse.\n")); | |
9146 | break; | |
b2175913 | 9147 | default: |
d8b34453 PA |
9148 | internal_error (__FILE__, __LINE__, |
9149 | _("bogus execution_direction value: %d"), | |
9150 | (int) execution_direction); | |
b2175913 MS |
9151 | } |
9152 | } | |
9153 | ||
d4db2f36 PA |
9154 | static void |
9155 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9156 | struct cmd_list_element *c, const char *value) | |
9157 | { | |
3e43a32a MS |
9158 | fprintf_filtered (file, _("Resuming the execution of threads " |
9159 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9160 | } |
ad52ddc6 | 9161 | |
22d2b532 SDJ |
9162 | /* Implementation of `siginfo' variable. */ |
9163 | ||
9164 | static const struct internalvar_funcs siginfo_funcs = | |
9165 | { | |
9166 | siginfo_make_value, | |
9167 | NULL, | |
9168 | NULL | |
9169 | }; | |
9170 | ||
372316f1 PA |
9171 | /* Callback for infrun's target events source. This is marked when a |
9172 | thread has a pending status to process. */ | |
9173 | ||
9174 | static void | |
9175 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9176 | { | |
372316f1 PA |
9177 | inferior_event_handler (INF_REG_EVENT, NULL); |
9178 | } | |
9179 | ||
c906108c | 9180 | void |
96baa820 | 9181 | _initialize_infrun (void) |
c906108c | 9182 | { |
52f0bd74 AC |
9183 | int i; |
9184 | int numsigs; | |
de0bea00 | 9185 | struct cmd_list_element *c; |
c906108c | 9186 | |
372316f1 PA |
9187 | /* Register extra event sources in the event loop. */ |
9188 | infrun_async_inferior_event_token | |
9189 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
9190 | ||
1bedd215 AC |
9191 | add_info ("signals", signals_info, _("\ |
9192 | What debugger does when program gets various signals.\n\ | |
9193 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9194 | add_info_alias ("handle", "signals", 0); |
9195 | ||
de0bea00 | 9196 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9197 | Specify how to handle signals.\n\ |
486c7739 | 9198 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9199 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9200 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9201 | will be displayed instead.\n\ |
9202 | \n\ | |
c906108c SS |
9203 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9204 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9205 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9206 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9207 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9208 | \n\ |
1bedd215 | 9209 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9210 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9211 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9212 | Print means print a message if this signal happens.\n\ | |
9213 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9214 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9215 | Pass and Stop may be combined.\n\ |
9216 | \n\ | |
9217 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9218 | may be interspersed with actions, with the actions being performed for\n\ | |
9219 | all signals cumulatively specified.")); | |
de0bea00 | 9220 | set_cmd_completer (c, handle_completer); |
486c7739 | 9221 | |
c906108c | 9222 | if (!dbx_commands) |
1a966eab AC |
9223 | stop_command = add_cmd ("stop", class_obscure, |
9224 | not_just_help_class_command, _("\ | |
9225 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9226 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9227 | of the program stops."), &cmdlist); |
c906108c | 9228 | |
ccce17b0 | 9229 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9230 | Set inferior debugging."), _("\ |
9231 | Show inferior debugging."), _("\ | |
9232 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9233 | NULL, |
9234 | show_debug_infrun, | |
9235 | &setdebuglist, &showdebuglist); | |
527159b7 | 9236 | |
3e43a32a MS |
9237 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9238 | &debug_displaced, _("\ | |
237fc4c9 PA |
9239 | Set displaced stepping debugging."), _("\ |
9240 | Show displaced stepping debugging."), _("\ | |
9241 | When non-zero, displaced stepping specific debugging is enabled."), | |
9242 | NULL, | |
9243 | show_debug_displaced, | |
9244 | &setdebuglist, &showdebuglist); | |
9245 | ||
ad52ddc6 PA |
9246 | add_setshow_boolean_cmd ("non-stop", no_class, |
9247 | &non_stop_1, _("\ | |
9248 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9249 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9250 | When debugging a multi-threaded program and this setting is\n\ | |
9251 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9252 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9253 | all other threads in the program while you interact with the thread of\n\ | |
9254 | interest. When you continue or step a thread, you can allow the other\n\ | |
9255 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9256 | thread's state, all threads stop.\n\ | |
9257 | \n\ | |
9258 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9259 | to run freely. You'll be able to step each thread independently,\n\ | |
9260 | leave it stopped or free to run as needed."), | |
9261 | set_non_stop, | |
9262 | show_non_stop, | |
9263 | &setlist, | |
9264 | &showlist); | |
9265 | ||
a493e3e2 | 9266 | numsigs = (int) GDB_SIGNAL_LAST; |
8d749320 SM |
9267 | signal_stop = XNEWVEC (unsigned char, numsigs); |
9268 | signal_print = XNEWVEC (unsigned char, numsigs); | |
9269 | signal_program = XNEWVEC (unsigned char, numsigs); | |
9270 | signal_catch = XNEWVEC (unsigned char, numsigs); | |
9271 | signal_pass = XNEWVEC (unsigned char, numsigs); | |
c906108c SS |
9272 | for (i = 0; i < numsigs; i++) |
9273 | { | |
9274 | signal_stop[i] = 1; | |
9275 | signal_print[i] = 1; | |
9276 | signal_program[i] = 1; | |
ab04a2af | 9277 | signal_catch[i] = 0; |
c906108c SS |
9278 | } |
9279 | ||
4d9d9d04 PA |
9280 | /* Signals caused by debugger's own actions should not be given to |
9281 | the program afterwards. | |
9282 | ||
9283 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9284 | explicitly specifies that it should be delivered to the target | |
9285 | program. Typically, that would occur when a user is debugging a | |
9286 | target monitor on a simulator: the target monitor sets a | |
9287 | breakpoint; the simulator encounters this breakpoint and halts | |
9288 | the simulation handing control to GDB; GDB, noting that the stop | |
9289 | address doesn't map to any known breakpoint, returns control back | |
9290 | to the simulator; the simulator then delivers the hardware | |
9291 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9292 | debugged. */ | |
a493e3e2 PA |
9293 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9294 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9295 | |
9296 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9297 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9298 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9299 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9300 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9301 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9302 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9303 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9304 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9305 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9306 | signal_print[GDB_SIGNAL_IO] = 0; | |
9307 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9308 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9309 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9310 | signal_print[GDB_SIGNAL_URG] = 0; | |
9311 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9312 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9313 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9314 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9315 | |
cd0fc7c3 SS |
9316 | /* These signals are used internally by user-level thread |
9317 | implementations. (See signal(5) on Solaris.) Like the above | |
9318 | signals, a healthy program receives and handles them as part of | |
9319 | its normal operation. */ | |
a493e3e2 PA |
9320 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9321 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9322 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9323 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9324 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9325 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
cd0fc7c3 | 9326 | |
2455069d UW |
9327 | /* Update cached state. */ |
9328 | signal_cache_update (-1); | |
9329 | ||
85c07804 AC |
9330 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9331 | &stop_on_solib_events, _("\ | |
9332 | Set stopping for shared library events."), _("\ | |
9333 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9334 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9335 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9336 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9337 | set_stop_on_solib_events, |
920d2a44 | 9338 | show_stop_on_solib_events, |
85c07804 | 9339 | &setlist, &showlist); |
c906108c | 9340 | |
7ab04401 AC |
9341 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9342 | follow_fork_mode_kind_names, | |
9343 | &follow_fork_mode_string, _("\ | |
9344 | Set debugger response to a program call of fork or vfork."), _("\ | |
9345 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9346 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9347 | parent - the original process is debugged after a fork\n\ | |
9348 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9349 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9350 | By default, the debugger will follow the parent process."), |
9351 | NULL, | |
920d2a44 | 9352 | show_follow_fork_mode_string, |
7ab04401 AC |
9353 | &setlist, &showlist); |
9354 | ||
6c95b8df PA |
9355 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9356 | follow_exec_mode_names, | |
9357 | &follow_exec_mode_string, _("\ | |
9358 | Set debugger response to a program call of exec."), _("\ | |
9359 | Show debugger response to a program call of exec."), _("\ | |
9360 | An exec call replaces the program image of a process.\n\ | |
9361 | \n\ | |
9362 | follow-exec-mode can be:\n\ | |
9363 | \n\ | |
cce7e648 | 9364 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9365 | to this new inferior. The program the process was running before\n\ |
9366 | the exec call can be restarted afterwards by restarting the original\n\ | |
9367 | inferior.\n\ | |
9368 | \n\ | |
9369 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9370 | The new executable image replaces the previous executable loaded in\n\ | |
9371 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9372 | the executable the process was running after the exec call.\n\ | |
9373 | \n\ | |
9374 | By default, the debugger will use the same inferior."), | |
9375 | NULL, | |
9376 | show_follow_exec_mode_string, | |
9377 | &setlist, &showlist); | |
9378 | ||
7ab04401 AC |
9379 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9380 | scheduler_enums, &scheduler_mode, _("\ | |
9381 | Set mode for locking scheduler during execution."), _("\ | |
9382 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9383 | off == no locking (threads may preempt at any time)\n\ |
9384 | on == full locking (no thread except the current thread may run)\n\ | |
9385 | This applies to both normal execution and replay mode.\n\ | |
9386 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9387 | In this mode, other threads may run during other commands.\n\ | |
9388 | This applies to both normal execution and replay mode.\n\ | |
9389 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9390 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9391 | show_scheduler_mode, |
7ab04401 | 9392 | &setlist, &showlist); |
5fbbeb29 | 9393 | |
d4db2f36 PA |
9394 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9395 | Set mode for resuming threads of all processes."), _("\ | |
9396 | Show mode for resuming threads of all processes."), _("\ | |
9397 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9398 | threads of all processes. When off (which is the default), execution\n\ | |
9399 | commands only resume the threads of the current process. The set of\n\ | |
9400 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9401 | mode (see help set scheduler-locking)."), | |
9402 | NULL, | |
9403 | show_schedule_multiple, | |
9404 | &setlist, &showlist); | |
9405 | ||
5bf193a2 AC |
9406 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9407 | Set mode of the step operation."), _("\ | |
9408 | Show mode of the step operation."), _("\ | |
9409 | When set, doing a step over a function without debug line information\n\ | |
9410 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9411 | function is skipped and the step command stops at a different source line."), | |
9412 | NULL, | |
920d2a44 | 9413 | show_step_stop_if_no_debug, |
5bf193a2 | 9414 | &setlist, &showlist); |
ca6724c1 | 9415 | |
72d0e2c5 YQ |
9416 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9417 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9418 | Set debugger's willingness to use displaced stepping."), _("\ |
9419 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9420 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9421 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9422 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9423 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9424 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9425 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9426 | NULL, |
9427 | show_can_use_displaced_stepping, | |
9428 | &setlist, &showlist); | |
237fc4c9 | 9429 | |
b2175913 MS |
9430 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9431 | &exec_direction, _("Set direction of execution.\n\ | |
9432 | Options are 'forward' or 'reverse'."), | |
9433 | _("Show direction of execution (forward/reverse)."), | |
9434 | _("Tells gdb whether to execute forward or backward."), | |
9435 | set_exec_direction_func, show_exec_direction_func, | |
9436 | &setlist, &showlist); | |
9437 | ||
6c95b8df PA |
9438 | /* Set/show detach-on-fork: user-settable mode. */ |
9439 | ||
9440 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9441 | Set whether gdb will detach the child of a fork."), _("\ | |
9442 | Show whether gdb will detach the child of a fork."), _("\ | |
9443 | Tells gdb whether to detach the child of a fork."), | |
9444 | NULL, NULL, &setlist, &showlist); | |
9445 | ||
03583c20 UW |
9446 | /* Set/show disable address space randomization mode. */ |
9447 | ||
9448 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9449 | &disable_randomization, _("\ | |
9450 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9451 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9452 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9453 | address space is disabled. Standalone programs run with the randomization\n\ | |
9454 | enabled by default on some platforms."), | |
9455 | &set_disable_randomization, | |
9456 | &show_disable_randomization, | |
9457 | &setlist, &showlist); | |
9458 | ||
ca6724c1 | 9459 | /* ptid initializations */ |
ca6724c1 KB |
9460 | inferior_ptid = null_ptid; |
9461 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd PA |
9462 | |
9463 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 9464 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 9465 | observer_attach_thread_exit (infrun_thread_thread_exit); |
fc1cf338 | 9466 | observer_attach_inferior_exit (infrun_inferior_exit); |
4aa995e1 PA |
9467 | |
9468 | /* Explicitly create without lookup, since that tries to create a | |
9469 | value with a void typed value, and when we get here, gdbarch | |
9470 | isn't initialized yet. At this point, we're quite sure there | |
9471 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9472 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9473 | |
9474 | add_setshow_boolean_cmd ("observer", no_class, | |
9475 | &observer_mode_1, _("\ | |
9476 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9477 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9478 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9479 | affect its execution. Registers and memory may not be changed,\n\ | |
9480 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9481 | or signalled."), | |
9482 | set_observer_mode, | |
9483 | show_observer_mode, | |
9484 | &setlist, | |
9485 | &showlist); | |
c906108c | 9486 | } |