Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
6aba47ca | 4 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
9b254dd1 | 5 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
4c38e0a4 | 6 | 2008, 2009, 2010 Free Software Foundation, Inc. |
c906108c | 7 | |
c5aa993b | 8 | This file is part of GDB. |
c906108c | 9 | |
c5aa993b JM |
10 | This program is free software; you can redistribute it and/or modify |
11 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 12 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 13 | (at your option) any later version. |
c906108c | 14 | |
c5aa993b JM |
15 | This program is distributed in the hope that it will be useful, |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
c906108c | 19 | |
c5aa993b | 20 | You should have received a copy of the GNU General Public License |
a9762ec7 | 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "gdb_string.h" | |
25 | #include <ctype.h> | |
26 | #include "symtab.h" | |
27 | #include "frame.h" | |
28 | #include "inferior.h" | |
60250e8b | 29 | #include "exceptions.h" |
c906108c | 30 | #include "breakpoint.h" |
03f2053f | 31 | #include "gdb_wait.h" |
c906108c SS |
32 | #include "gdbcore.h" |
33 | #include "gdbcmd.h" | |
210661e7 | 34 | #include "cli/cli-script.h" |
c906108c SS |
35 | #include "target.h" |
36 | #include "gdbthread.h" | |
37 | #include "annotate.h" | |
1adeb98a | 38 | #include "symfile.h" |
7a292a7a | 39 | #include "top.h" |
c906108c | 40 | #include <signal.h> |
2acceee2 | 41 | #include "inf-loop.h" |
4e052eda | 42 | #include "regcache.h" |
fd0407d6 | 43 | #include "value.h" |
06600e06 | 44 | #include "observer.h" |
f636b87d | 45 | #include "language.h" |
a77053c2 | 46 | #include "solib.h" |
f17517ea | 47 | #include "main.h" |
9f976b41 | 48 | #include "gdb_assert.h" |
034dad6f | 49 | #include "mi/mi-common.h" |
4f8d22e3 | 50 | #include "event-top.h" |
96429cc8 | 51 | #include "record.h" |
edb3359d | 52 | #include "inline-frame.h" |
4efc6507 | 53 | #include "jit.h" |
06cd862c | 54 | #include "tracepoint.h" |
c906108c SS |
55 | |
56 | /* Prototypes for local functions */ | |
57 | ||
96baa820 | 58 | static void signals_info (char *, int); |
c906108c | 59 | |
96baa820 | 60 | static void handle_command (char *, int); |
c906108c | 61 | |
96baa820 | 62 | static void sig_print_info (enum target_signal); |
c906108c | 63 | |
96baa820 | 64 | static void sig_print_header (void); |
c906108c | 65 | |
74b7792f | 66 | static void resume_cleanups (void *); |
c906108c | 67 | |
96baa820 | 68 | static int hook_stop_stub (void *); |
c906108c | 69 | |
96baa820 JM |
70 | static int restore_selected_frame (void *); |
71 | ||
4ef3f3be | 72 | static int follow_fork (void); |
96baa820 JM |
73 | |
74 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 75 | struct cmd_list_element *c); |
96baa820 | 76 | |
4e1c45ea | 77 | static int currently_stepping (struct thread_info *tp); |
96baa820 | 78 | |
b3444185 PA |
79 | static int currently_stepping_or_nexting_callback (struct thread_info *tp, |
80 | void *data); | |
a7212384 | 81 | |
96baa820 JM |
82 | static void xdb_handle_command (char *args, int from_tty); |
83 | ||
6a6b96b9 | 84 | static int prepare_to_proceed (int); |
ea67f13b | 85 | |
33d62d64 JK |
86 | static void print_exited_reason (int exitstatus); |
87 | ||
88 | static void print_signal_exited_reason (enum target_signal siggnal); | |
89 | ||
90 | static void print_no_history_reason (void); | |
91 | ||
92 | static void print_signal_received_reason (enum target_signal siggnal); | |
93 | ||
94 | static void print_end_stepping_range_reason (void); | |
95 | ||
96baa820 | 96 | void _initialize_infrun (void); |
43ff13b4 | 97 | |
e58b0e63 PA |
98 | void nullify_last_target_wait_ptid (void); |
99 | ||
5fbbeb29 CF |
100 | /* When set, stop the 'step' command if we enter a function which has |
101 | no line number information. The normal behavior is that we step | |
102 | over such function. */ | |
103 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
104 | static void |
105 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
106 | struct cmd_list_element *c, const char *value) | |
107 | { | |
108 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
109 | } | |
5fbbeb29 | 110 | |
43ff13b4 | 111 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 112 | |
43ff13b4 JM |
113 | int sync_execution = 0; |
114 | ||
c906108c SS |
115 | /* wait_for_inferior and normal_stop use this to notify the user |
116 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
117 | running in. */ |
118 | ||
39f77062 | 119 | static ptid_t previous_inferior_ptid; |
7a292a7a | 120 | |
6c95b8df PA |
121 | /* Default behavior is to detach newly forked processes (legacy). */ |
122 | int detach_fork = 1; | |
123 | ||
237fc4c9 PA |
124 | int debug_displaced = 0; |
125 | static void | |
126 | show_debug_displaced (struct ui_file *file, int from_tty, | |
127 | struct cmd_list_element *c, const char *value) | |
128 | { | |
129 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
130 | } | |
131 | ||
628fe4e4 | 132 | int debug_infrun = 0; |
920d2a44 AC |
133 | static void |
134 | show_debug_infrun (struct ui_file *file, int from_tty, | |
135 | struct cmd_list_element *c, const char *value) | |
136 | { | |
137 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
138 | } | |
527159b7 | 139 | |
d4f3574e SS |
140 | /* If the program uses ELF-style shared libraries, then calls to |
141 | functions in shared libraries go through stubs, which live in a | |
142 | table called the PLT (Procedure Linkage Table). The first time the | |
143 | function is called, the stub sends control to the dynamic linker, | |
144 | which looks up the function's real address, patches the stub so | |
145 | that future calls will go directly to the function, and then passes | |
146 | control to the function. | |
147 | ||
148 | If we are stepping at the source level, we don't want to see any of | |
149 | this --- we just want to skip over the stub and the dynamic linker. | |
150 | The simple approach is to single-step until control leaves the | |
151 | dynamic linker. | |
152 | ||
ca557f44 AC |
153 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
154 | dynamic linker calls functions in the shared C library, so you | |
155 | can't tell from the PC alone whether the dynamic linker is still | |
156 | running. In this case, we use a step-resume breakpoint to get us | |
157 | past the dynamic linker, as if we were using "next" to step over a | |
158 | function call. | |
d4f3574e | 159 | |
cfd8ab24 | 160 | in_solib_dynsym_resolve_code() says whether we're in the dynamic |
d4f3574e SS |
161 | linker code or not. Normally, this means we single-step. However, |
162 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
163 | address where we can place a step-resume breakpoint to get past the | |
164 | linker's symbol resolution function. | |
165 | ||
cfd8ab24 | 166 | in_solib_dynsym_resolve_code() can generally be implemented in a |
d4f3574e SS |
167 | pretty portable way, by comparing the PC against the address ranges |
168 | of the dynamic linker's sections. | |
169 | ||
170 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
171 | it depends on internal details of the dynamic linker. It's usually | |
172 | not too hard to figure out where to put a breakpoint, but it | |
173 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
174 | sanity checking. If it can't figure things out, returning zero and | |
175 | getting the (possibly confusing) stepping behavior is better than | |
176 | signalling an error, which will obscure the change in the | |
177 | inferior's state. */ | |
c906108c | 178 | |
c906108c SS |
179 | /* This function returns TRUE if pc is the address of an instruction |
180 | that lies within the dynamic linker (such as the event hook, or the | |
181 | dld itself). | |
182 | ||
183 | This function must be used only when a dynamic linker event has | |
184 | been caught, and the inferior is being stepped out of the hook, or | |
185 | undefined results are guaranteed. */ | |
186 | ||
187 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
188 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
189 | #endif | |
190 | ||
d914c394 SS |
191 | /* "Observer mode" is somewhat like a more extreme version of |
192 | non-stop, in which all GDB operations that might affect the | |
193 | target's execution have been disabled. */ | |
194 | ||
195 | static int non_stop_1 = 0; | |
196 | ||
197 | int observer_mode = 0; | |
198 | static int observer_mode_1 = 0; | |
199 | ||
200 | static void | |
201 | set_observer_mode (char *args, int from_tty, | |
202 | struct cmd_list_element *c) | |
203 | { | |
204 | extern int pagination_enabled; | |
205 | ||
206 | if (target_has_execution) | |
207 | { | |
208 | observer_mode_1 = observer_mode; | |
209 | error (_("Cannot change this setting while the inferior is running.")); | |
210 | } | |
211 | ||
212 | observer_mode = observer_mode_1; | |
213 | ||
214 | may_write_registers = !observer_mode; | |
215 | may_write_memory = !observer_mode; | |
216 | may_insert_breakpoints = !observer_mode; | |
217 | may_insert_tracepoints = !observer_mode; | |
218 | /* We can insert fast tracepoints in or out of observer mode, | |
219 | but enable them if we're going into this mode. */ | |
220 | if (observer_mode) | |
221 | may_insert_fast_tracepoints = 1; | |
222 | may_stop = !observer_mode; | |
223 | update_target_permissions (); | |
224 | ||
225 | /* Going *into* observer mode we must force non-stop, then | |
226 | going out we leave it that way. */ | |
227 | if (observer_mode) | |
228 | { | |
229 | target_async_permitted = 1; | |
230 | pagination_enabled = 0; | |
231 | non_stop = non_stop_1 = 1; | |
232 | } | |
233 | ||
234 | if (from_tty) | |
235 | printf_filtered (_("Observer mode is now %s.\n"), | |
236 | (observer_mode ? "on" : "off")); | |
237 | } | |
238 | ||
239 | static void | |
240 | show_observer_mode (struct ui_file *file, int from_tty, | |
241 | struct cmd_list_element *c, const char *value) | |
242 | { | |
243 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
244 | } | |
245 | ||
246 | /* This updates the value of observer mode based on changes in | |
247 | permissions. Note that we are deliberately ignoring the values of | |
248 | may-write-registers and may-write-memory, since the user may have | |
249 | reason to enable these during a session, for instance to turn on a | |
250 | debugging-related global. */ | |
251 | ||
252 | void | |
253 | update_observer_mode (void) | |
254 | { | |
255 | int newval; | |
256 | ||
257 | newval = (!may_insert_breakpoints | |
258 | && !may_insert_tracepoints | |
259 | && may_insert_fast_tracepoints | |
260 | && !may_stop | |
261 | && non_stop); | |
262 | ||
263 | /* Let the user know if things change. */ | |
264 | if (newval != observer_mode) | |
265 | printf_filtered (_("Observer mode is now %s.\n"), | |
266 | (newval ? "on" : "off")); | |
267 | ||
268 | observer_mode = observer_mode_1 = newval; | |
269 | } | |
c2c6d25f | 270 | |
c906108c SS |
271 | /* Tables of how to react to signals; the user sets them. */ |
272 | ||
273 | static unsigned char *signal_stop; | |
274 | static unsigned char *signal_print; | |
275 | static unsigned char *signal_program; | |
276 | ||
277 | #define SET_SIGS(nsigs,sigs,flags) \ | |
278 | do { \ | |
279 | int signum = (nsigs); \ | |
280 | while (signum-- > 0) \ | |
281 | if ((sigs)[signum]) \ | |
282 | (flags)[signum] = 1; \ | |
283 | } while (0) | |
284 | ||
285 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
286 | do { \ | |
287 | int signum = (nsigs); \ | |
288 | while (signum-- > 0) \ | |
289 | if ((sigs)[signum]) \ | |
290 | (flags)[signum] = 0; \ | |
291 | } while (0) | |
292 | ||
39f77062 KB |
293 | /* Value to pass to target_resume() to cause all threads to resume */ |
294 | ||
edb3359d | 295 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
296 | |
297 | /* Command list pointer for the "stop" placeholder. */ | |
298 | ||
299 | static struct cmd_list_element *stop_command; | |
300 | ||
c906108c SS |
301 | /* Function inferior was in as of last step command. */ |
302 | ||
303 | static struct symbol *step_start_function; | |
304 | ||
c906108c SS |
305 | /* Nonzero if we want to give control to the user when we're notified |
306 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 307 | int stop_on_solib_events; |
920d2a44 AC |
308 | static void |
309 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
310 | struct cmd_list_element *c, const char *value) | |
311 | { | |
312 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
313 | value); | |
314 | } | |
c906108c | 315 | |
c906108c SS |
316 | /* Nonzero means expecting a trace trap |
317 | and should stop the inferior and return silently when it happens. */ | |
318 | ||
319 | int stop_after_trap; | |
320 | ||
642fd101 DE |
321 | /* Save register contents here when executing a "finish" command or are |
322 | about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set. | |
c906108c SS |
323 | Thus this contains the return value from the called function (assuming |
324 | values are returned in a register). */ | |
325 | ||
72cec141 | 326 | struct regcache *stop_registers; |
c906108c | 327 | |
c906108c SS |
328 | /* Nonzero after stop if current stack frame should be printed. */ |
329 | ||
330 | static int stop_print_frame; | |
331 | ||
e02bc4cc | 332 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
333 | returned by target_wait()/deprecated_target_wait_hook(). This |
334 | information is returned by get_last_target_status(). */ | |
39f77062 | 335 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
336 | static struct target_waitstatus target_last_waitstatus; |
337 | ||
0d1e5fa7 PA |
338 | static void context_switch (ptid_t ptid); |
339 | ||
4e1c45ea | 340 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 PA |
341 | |
342 | void init_infwait_state (void); | |
a474d7c2 | 343 | |
53904c9e AC |
344 | static const char follow_fork_mode_child[] = "child"; |
345 | static const char follow_fork_mode_parent[] = "parent"; | |
346 | ||
488f131b | 347 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e AC |
348 | follow_fork_mode_child, |
349 | follow_fork_mode_parent, | |
350 | NULL | |
ef346e04 | 351 | }; |
c906108c | 352 | |
53904c9e | 353 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
354 | static void |
355 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
356 | struct cmd_list_element *c, const char *value) | |
357 | { | |
358 | fprintf_filtered (file, _("\ | |
359 | Debugger response to a program call of fork or vfork is \"%s\".\n"), | |
360 | value); | |
361 | } | |
c906108c SS |
362 | \f |
363 | ||
e58b0e63 PA |
364 | /* Tell the target to follow the fork we're stopped at. Returns true |
365 | if the inferior should be resumed; false, if the target for some | |
366 | reason decided it's best not to resume. */ | |
367 | ||
6604731b | 368 | static int |
4ef3f3be | 369 | follow_fork (void) |
c906108c | 370 | { |
ea1dd7bc | 371 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
372 | int should_resume = 1; |
373 | struct thread_info *tp; | |
374 | ||
375 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
376 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
377 | parent thread structure's run control related fields, not just these. |
378 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
379 | struct breakpoint *step_resume_breakpoint = NULL; | |
380 | CORE_ADDR step_range_start = 0; | |
381 | CORE_ADDR step_range_end = 0; | |
382 | struct frame_id step_frame_id = { 0 }; | |
e58b0e63 PA |
383 | |
384 | if (!non_stop) | |
385 | { | |
386 | ptid_t wait_ptid; | |
387 | struct target_waitstatus wait_status; | |
388 | ||
389 | /* Get the last target status returned by target_wait(). */ | |
390 | get_last_target_status (&wait_ptid, &wait_status); | |
391 | ||
392 | /* If not stopped at a fork event, then there's nothing else to | |
393 | do. */ | |
394 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
395 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
396 | return 1; | |
397 | ||
398 | /* Check if we switched over from WAIT_PTID, since the event was | |
399 | reported. */ | |
400 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
401 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
402 | { | |
403 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
404 | target to follow it (in either direction). We'll | |
405 | afterwards refuse to resume, and inform the user what | |
406 | happened. */ | |
407 | switch_to_thread (wait_ptid); | |
408 | should_resume = 0; | |
409 | } | |
410 | } | |
411 | ||
412 | tp = inferior_thread (); | |
413 | ||
414 | /* If there were any forks/vforks that were caught and are now to be | |
415 | followed, then do so now. */ | |
416 | switch (tp->pending_follow.kind) | |
417 | { | |
418 | case TARGET_WAITKIND_FORKED: | |
419 | case TARGET_WAITKIND_VFORKED: | |
420 | { | |
421 | ptid_t parent, child; | |
422 | ||
423 | /* If the user did a next/step, etc, over a fork call, | |
424 | preserve the stepping state in the fork child. */ | |
425 | if (follow_child && should_resume) | |
426 | { | |
427 | step_resume_breakpoint | |
428 | = clone_momentary_breakpoint (tp->step_resume_breakpoint); | |
429 | step_range_start = tp->step_range_start; | |
430 | step_range_end = tp->step_range_end; | |
431 | step_frame_id = tp->step_frame_id; | |
432 | ||
433 | /* For now, delete the parent's sr breakpoint, otherwise, | |
434 | parent/child sr breakpoints are considered duplicates, | |
435 | and the child version will not be installed. Remove | |
436 | this when the breakpoints module becomes aware of | |
437 | inferiors and address spaces. */ | |
438 | delete_step_resume_breakpoint (tp); | |
439 | tp->step_range_start = 0; | |
440 | tp->step_range_end = 0; | |
441 | tp->step_frame_id = null_frame_id; | |
442 | } | |
443 | ||
444 | parent = inferior_ptid; | |
445 | child = tp->pending_follow.value.related_pid; | |
446 | ||
447 | /* Tell the target to do whatever is necessary to follow | |
448 | either parent or child. */ | |
449 | if (target_follow_fork (follow_child)) | |
450 | { | |
451 | /* Target refused to follow, or there's some other reason | |
452 | we shouldn't resume. */ | |
453 | should_resume = 0; | |
454 | } | |
455 | else | |
456 | { | |
457 | /* This pending follow fork event is now handled, one way | |
458 | or another. The previous selected thread may be gone | |
459 | from the lists by now, but if it is still around, need | |
460 | to clear the pending follow request. */ | |
e09875d4 | 461 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
462 | if (tp) |
463 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
464 | ||
465 | /* This makes sure we don't try to apply the "Switched | |
466 | over from WAIT_PID" logic above. */ | |
467 | nullify_last_target_wait_ptid (); | |
468 | ||
469 | /* If we followed the child, switch to it... */ | |
470 | if (follow_child) | |
471 | { | |
472 | switch_to_thread (child); | |
473 | ||
474 | /* ... and preserve the stepping state, in case the | |
475 | user was stepping over the fork call. */ | |
476 | if (should_resume) | |
477 | { | |
478 | tp = inferior_thread (); | |
479 | tp->step_resume_breakpoint = step_resume_breakpoint; | |
480 | tp->step_range_start = step_range_start; | |
481 | tp->step_range_end = step_range_end; | |
482 | tp->step_frame_id = step_frame_id; | |
483 | } | |
484 | else | |
485 | { | |
486 | /* If we get here, it was because we're trying to | |
487 | resume from a fork catchpoint, but, the user | |
488 | has switched threads away from the thread that | |
489 | forked. In that case, the resume command | |
490 | issued is most likely not applicable to the | |
491 | child, so just warn, and refuse to resume. */ | |
492 | warning (_("\ | |
493 | Not resuming: switched threads before following fork child.\n")); | |
494 | } | |
495 | ||
496 | /* Reset breakpoints in the child as appropriate. */ | |
497 | follow_inferior_reset_breakpoints (); | |
498 | } | |
499 | else | |
500 | switch_to_thread (parent); | |
501 | } | |
502 | } | |
503 | break; | |
504 | case TARGET_WAITKIND_SPURIOUS: | |
505 | /* Nothing to follow. */ | |
506 | break; | |
507 | default: | |
508 | internal_error (__FILE__, __LINE__, | |
509 | "Unexpected pending_follow.kind %d\n", | |
510 | tp->pending_follow.kind); | |
511 | break; | |
512 | } | |
c906108c | 513 | |
e58b0e63 | 514 | return should_resume; |
c906108c SS |
515 | } |
516 | ||
6604731b DJ |
517 | void |
518 | follow_inferior_reset_breakpoints (void) | |
c906108c | 519 | { |
4e1c45ea PA |
520 | struct thread_info *tp = inferior_thread (); |
521 | ||
6604731b DJ |
522 | /* Was there a step_resume breakpoint? (There was if the user |
523 | did a "next" at the fork() call.) If so, explicitly reset its | |
524 | thread number. | |
525 | ||
526 | step_resumes are a form of bp that are made to be per-thread. | |
527 | Since we created the step_resume bp when the parent process | |
528 | was being debugged, and now are switching to the child process, | |
529 | from the breakpoint package's viewpoint, that's a switch of | |
530 | "threads". We must update the bp's notion of which thread | |
531 | it is for, or it'll be ignored when it triggers. */ | |
532 | ||
4e1c45ea PA |
533 | if (tp->step_resume_breakpoint) |
534 | breakpoint_re_set_thread (tp->step_resume_breakpoint); | |
6604731b DJ |
535 | |
536 | /* Reinsert all breakpoints in the child. The user may have set | |
537 | breakpoints after catching the fork, in which case those | |
538 | were never set in the child, but only in the parent. This makes | |
539 | sure the inserted breakpoints match the breakpoint list. */ | |
540 | ||
541 | breakpoint_re_set (); | |
542 | insert_breakpoints (); | |
c906108c | 543 | } |
c906108c | 544 | |
6c95b8df PA |
545 | /* The child has exited or execed: resume threads of the parent the |
546 | user wanted to be executing. */ | |
547 | ||
548 | static int | |
549 | proceed_after_vfork_done (struct thread_info *thread, | |
550 | void *arg) | |
551 | { | |
552 | int pid = * (int *) arg; | |
553 | ||
554 | if (ptid_get_pid (thread->ptid) == pid | |
555 | && is_running (thread->ptid) | |
556 | && !is_executing (thread->ptid) | |
557 | && !thread->stop_requested | |
558 | && thread->stop_signal == TARGET_SIGNAL_0) | |
559 | { | |
560 | if (debug_infrun) | |
561 | fprintf_unfiltered (gdb_stdlog, | |
562 | "infrun: resuming vfork parent thread %s\n", | |
563 | target_pid_to_str (thread->ptid)); | |
564 | ||
565 | switch_to_thread (thread->ptid); | |
566 | clear_proceed_status (); | |
567 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_DEFAULT, 0); | |
568 | } | |
569 | ||
570 | return 0; | |
571 | } | |
572 | ||
573 | /* Called whenever we notice an exec or exit event, to handle | |
574 | detaching or resuming a vfork parent. */ | |
575 | ||
576 | static void | |
577 | handle_vfork_child_exec_or_exit (int exec) | |
578 | { | |
579 | struct inferior *inf = current_inferior (); | |
580 | ||
581 | if (inf->vfork_parent) | |
582 | { | |
583 | int resume_parent = -1; | |
584 | ||
585 | /* This exec or exit marks the end of the shared memory region | |
586 | between the parent and the child. If the user wanted to | |
587 | detach from the parent, now is the time. */ | |
588 | ||
589 | if (inf->vfork_parent->pending_detach) | |
590 | { | |
591 | struct thread_info *tp; | |
592 | struct cleanup *old_chain; | |
593 | struct program_space *pspace; | |
594 | struct address_space *aspace; | |
595 | ||
596 | /* follow-fork child, detach-on-fork on */ | |
597 | ||
598 | old_chain = make_cleanup_restore_current_thread (); | |
599 | ||
600 | /* We're letting loose of the parent. */ | |
601 | tp = any_live_thread_of_process (inf->vfork_parent->pid); | |
602 | switch_to_thread (tp->ptid); | |
603 | ||
604 | /* We're about to detach from the parent, which implicitly | |
605 | removes breakpoints from its address space. There's a | |
606 | catch here: we want to reuse the spaces for the child, | |
607 | but, parent/child are still sharing the pspace at this | |
608 | point, although the exec in reality makes the kernel give | |
609 | the child a fresh set of new pages. The problem here is | |
610 | that the breakpoints module being unaware of this, would | |
611 | likely chose the child process to write to the parent | |
612 | address space. Swapping the child temporarily away from | |
613 | the spaces has the desired effect. Yes, this is "sort | |
614 | of" a hack. */ | |
615 | ||
616 | pspace = inf->pspace; | |
617 | aspace = inf->aspace; | |
618 | inf->aspace = NULL; | |
619 | inf->pspace = NULL; | |
620 | ||
621 | if (debug_infrun || info_verbose) | |
622 | { | |
623 | target_terminal_ours (); | |
624 | ||
625 | if (exec) | |
626 | fprintf_filtered (gdb_stdlog, | |
627 | "Detaching vfork parent process %d after child exec.\n", | |
628 | inf->vfork_parent->pid); | |
629 | else | |
630 | fprintf_filtered (gdb_stdlog, | |
631 | "Detaching vfork parent process %d after child exit.\n", | |
632 | inf->vfork_parent->pid); | |
633 | } | |
634 | ||
635 | target_detach (NULL, 0); | |
636 | ||
637 | /* Put it back. */ | |
638 | inf->pspace = pspace; | |
639 | inf->aspace = aspace; | |
640 | ||
641 | do_cleanups (old_chain); | |
642 | } | |
643 | else if (exec) | |
644 | { | |
645 | /* We're staying attached to the parent, so, really give the | |
646 | child a new address space. */ | |
647 | inf->pspace = add_program_space (maybe_new_address_space ()); | |
648 | inf->aspace = inf->pspace->aspace; | |
649 | inf->removable = 1; | |
650 | set_current_program_space (inf->pspace); | |
651 | ||
652 | resume_parent = inf->vfork_parent->pid; | |
653 | ||
654 | /* Break the bonds. */ | |
655 | inf->vfork_parent->vfork_child = NULL; | |
656 | } | |
657 | else | |
658 | { | |
659 | struct cleanup *old_chain; | |
660 | struct program_space *pspace; | |
661 | ||
662 | /* If this is a vfork child exiting, then the pspace and | |
663 | aspaces were shared with the parent. Since we're | |
664 | reporting the process exit, we'll be mourning all that is | |
665 | found in the address space, and switching to null_ptid, | |
666 | preparing to start a new inferior. But, since we don't | |
667 | want to clobber the parent's address/program spaces, we | |
668 | go ahead and create a new one for this exiting | |
669 | inferior. */ | |
670 | ||
671 | /* Switch to null_ptid, so that clone_program_space doesn't want | |
672 | to read the selected frame of a dead process. */ | |
673 | old_chain = save_inferior_ptid (); | |
674 | inferior_ptid = null_ptid; | |
675 | ||
676 | /* This inferior is dead, so avoid giving the breakpoints | |
677 | module the option to write through to it (cloning a | |
678 | program space resets breakpoints). */ | |
679 | inf->aspace = NULL; | |
680 | inf->pspace = NULL; | |
681 | pspace = add_program_space (maybe_new_address_space ()); | |
682 | set_current_program_space (pspace); | |
683 | inf->removable = 1; | |
684 | clone_program_space (pspace, inf->vfork_parent->pspace); | |
685 | inf->pspace = pspace; | |
686 | inf->aspace = pspace->aspace; | |
687 | ||
688 | /* Put back inferior_ptid. We'll continue mourning this | |
689 | inferior. */ | |
690 | do_cleanups (old_chain); | |
691 | ||
692 | resume_parent = inf->vfork_parent->pid; | |
693 | /* Break the bonds. */ | |
694 | inf->vfork_parent->vfork_child = NULL; | |
695 | } | |
696 | ||
697 | inf->vfork_parent = NULL; | |
698 | ||
699 | gdb_assert (current_program_space == inf->pspace); | |
700 | ||
701 | if (non_stop && resume_parent != -1) | |
702 | { | |
703 | /* If the user wanted the parent to be running, let it go | |
704 | free now. */ | |
705 | struct cleanup *old_chain = make_cleanup_restore_current_thread (); | |
706 | ||
707 | if (debug_infrun) | |
708 | fprintf_unfiltered (gdb_stdlog, "infrun: resuming vfork parent process %d\n", | |
709 | resume_parent); | |
710 | ||
711 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
712 | ||
713 | do_cleanups (old_chain); | |
714 | } | |
715 | } | |
716 | } | |
717 | ||
718 | /* Enum strings for "set|show displaced-stepping". */ | |
719 | ||
720 | static const char follow_exec_mode_new[] = "new"; | |
721 | static const char follow_exec_mode_same[] = "same"; | |
722 | static const char *follow_exec_mode_names[] = | |
723 | { | |
724 | follow_exec_mode_new, | |
725 | follow_exec_mode_same, | |
726 | NULL, | |
727 | }; | |
728 | ||
729 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
730 | static void | |
731 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
732 | struct cmd_list_element *c, const char *value) | |
733 | { | |
734 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
735 | } | |
736 | ||
1adeb98a FN |
737 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
738 | ||
c906108c | 739 | static void |
3a3e9ee3 | 740 | follow_exec (ptid_t pid, char *execd_pathname) |
c906108c | 741 | { |
4e1c45ea | 742 | struct thread_info *th = inferior_thread (); |
6c95b8df | 743 | struct inferior *inf = current_inferior (); |
7a292a7a | 744 | |
c906108c SS |
745 | /* This is an exec event that we actually wish to pay attention to. |
746 | Refresh our symbol table to the newly exec'd program, remove any | |
747 | momentary bp's, etc. | |
748 | ||
749 | If there are breakpoints, they aren't really inserted now, | |
750 | since the exec() transformed our inferior into a fresh set | |
751 | of instructions. | |
752 | ||
753 | We want to preserve symbolic breakpoints on the list, since | |
754 | we have hopes that they can be reset after the new a.out's | |
755 | symbol table is read. | |
756 | ||
757 | However, any "raw" breakpoints must be removed from the list | |
758 | (e.g., the solib bp's), since their address is probably invalid | |
759 | now. | |
760 | ||
761 | And, we DON'T want to call delete_breakpoints() here, since | |
762 | that may write the bp's "shadow contents" (the instruction | |
763 | value that was overwritten witha TRAP instruction). Since | |
764 | we now have a new a.out, those shadow contents aren't valid. */ | |
6c95b8df PA |
765 | |
766 | mark_breakpoints_out (); | |
767 | ||
c906108c SS |
768 | update_breakpoints_after_exec (); |
769 | ||
770 | /* If there was one, it's gone now. We cannot truly step-to-next | |
771 | statement through an exec(). */ | |
4e1c45ea PA |
772 | th->step_resume_breakpoint = NULL; |
773 | th->step_range_start = 0; | |
774 | th->step_range_end = 0; | |
c906108c | 775 | |
a75724bc PA |
776 | /* The target reports the exec event to the main thread, even if |
777 | some other thread does the exec, and even if the main thread was | |
778 | already stopped --- if debugging in non-stop mode, it's possible | |
779 | the user had the main thread held stopped in the previous image | |
780 | --- release it now. This is the same behavior as step-over-exec | |
781 | with scheduler-locking on in all-stop mode. */ | |
782 | th->stop_requested = 0; | |
783 | ||
c906108c | 784 | /* What is this a.out's name? */ |
6c95b8df PA |
785 | printf_unfiltered (_("%s is executing new program: %s\n"), |
786 | target_pid_to_str (inferior_ptid), | |
787 | execd_pathname); | |
c906108c SS |
788 | |
789 | /* We've followed the inferior through an exec. Therefore, the | |
790 | inferior has essentially been killed & reborn. */ | |
7a292a7a | 791 | |
c906108c | 792 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
793 | |
794 | breakpoint_init_inferior (inf_execd); | |
e85a822c DJ |
795 | |
796 | if (gdb_sysroot && *gdb_sysroot) | |
797 | { | |
798 | char *name = alloca (strlen (gdb_sysroot) | |
799 | + strlen (execd_pathname) | |
800 | + 1); | |
abbb1732 | 801 | |
e85a822c DJ |
802 | strcpy (name, gdb_sysroot); |
803 | strcat (name, execd_pathname); | |
804 | execd_pathname = name; | |
805 | } | |
c906108c | 806 | |
cce9b6bf PA |
807 | /* Reset the shared library package. This ensures that we get a |
808 | shlib event when the child reaches "_start", at which point the | |
809 | dld will have had a chance to initialize the child. */ | |
810 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
811 | we don't want those to be satisfied by the libraries of the | |
812 | previous incarnation of this process. */ | |
813 | no_shared_libraries (NULL, 0); | |
814 | ||
6c95b8df PA |
815 | if (follow_exec_mode_string == follow_exec_mode_new) |
816 | { | |
817 | struct program_space *pspace; | |
6c95b8df PA |
818 | |
819 | /* The user wants to keep the old inferior and program spaces | |
820 | around. Create a new fresh one, and switch to it. */ | |
821 | ||
822 | inf = add_inferior (current_inferior ()->pid); | |
823 | pspace = add_program_space (maybe_new_address_space ()); | |
824 | inf->pspace = pspace; | |
825 | inf->aspace = pspace->aspace; | |
826 | ||
827 | exit_inferior_num_silent (current_inferior ()->num); | |
828 | ||
829 | set_current_inferior (inf); | |
830 | set_current_program_space (pspace); | |
831 | } | |
832 | ||
833 | gdb_assert (current_program_space == inf->pspace); | |
834 | ||
835 | /* That a.out is now the one to use. */ | |
836 | exec_file_attach (execd_pathname, 0); | |
837 | ||
cce9b6bf | 838 | /* Load the main file's symbols. */ |
1adeb98a | 839 | symbol_file_add_main (execd_pathname, 0); |
c906108c | 840 | |
7a292a7a | 841 | #ifdef SOLIB_CREATE_INFERIOR_HOOK |
39f77062 | 842 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
a77053c2 | 843 | #else |
268a4a75 | 844 | solib_create_inferior_hook (0); |
7a292a7a | 845 | #endif |
c906108c | 846 | |
4efc6507 DE |
847 | jit_inferior_created_hook (); |
848 | ||
c906108c SS |
849 | /* Reinsert all breakpoints. (Those which were symbolic have |
850 | been reset to the proper address in the new a.out, thanks | |
851 | to symbol_file_command...) */ | |
852 | insert_breakpoints (); | |
853 | ||
854 | /* The next resume of this inferior should bring it to the shlib | |
855 | startup breakpoints. (If the user had also set bp's on | |
856 | "main" from the old (parent) process, then they'll auto- | |
857 | matically get reset there in the new process.) */ | |
c906108c SS |
858 | } |
859 | ||
860 | /* Non-zero if we just simulating a single-step. This is needed | |
861 | because we cannot remove the breakpoints in the inferior process | |
862 | until after the `wait' in `wait_for_inferior'. */ | |
863 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
864 | |
865 | /* The thread we inserted single-step breakpoints for. */ | |
866 | static ptid_t singlestep_ptid; | |
867 | ||
fd48f117 DJ |
868 | /* PC when we started this single-step. */ |
869 | static CORE_ADDR singlestep_pc; | |
870 | ||
9f976b41 DJ |
871 | /* If another thread hit the singlestep breakpoint, we save the original |
872 | thread here so that we can resume single-stepping it later. */ | |
873 | static ptid_t saved_singlestep_ptid; | |
874 | static int stepping_past_singlestep_breakpoint; | |
6a6b96b9 | 875 | |
ca67fcb8 VP |
876 | /* If not equal to null_ptid, this means that after stepping over breakpoint |
877 | is finished, we need to switch to deferred_step_ptid, and step it. | |
878 | ||
879 | The use case is when one thread has hit a breakpoint, and then the user | |
880 | has switched to another thread and issued 'step'. We need to step over | |
881 | breakpoint in the thread which hit the breakpoint, but then continue | |
882 | stepping the thread user has selected. */ | |
883 | static ptid_t deferred_step_ptid; | |
c906108c | 884 | \f |
237fc4c9 PA |
885 | /* Displaced stepping. */ |
886 | ||
887 | /* In non-stop debugging mode, we must take special care to manage | |
888 | breakpoints properly; in particular, the traditional strategy for | |
889 | stepping a thread past a breakpoint it has hit is unsuitable. | |
890 | 'Displaced stepping' is a tactic for stepping one thread past a | |
891 | breakpoint it has hit while ensuring that other threads running | |
892 | concurrently will hit the breakpoint as they should. | |
893 | ||
894 | The traditional way to step a thread T off a breakpoint in a | |
895 | multi-threaded program in all-stop mode is as follows: | |
896 | ||
897 | a0) Initially, all threads are stopped, and breakpoints are not | |
898 | inserted. | |
899 | a1) We single-step T, leaving breakpoints uninserted. | |
900 | a2) We insert breakpoints, and resume all threads. | |
901 | ||
902 | In non-stop debugging, however, this strategy is unsuitable: we | |
903 | don't want to have to stop all threads in the system in order to | |
904 | continue or step T past a breakpoint. Instead, we use displaced | |
905 | stepping: | |
906 | ||
907 | n0) Initially, T is stopped, other threads are running, and | |
908 | breakpoints are inserted. | |
909 | n1) We copy the instruction "under" the breakpoint to a separate | |
910 | location, outside the main code stream, making any adjustments | |
911 | to the instruction, register, and memory state as directed by | |
912 | T's architecture. | |
913 | n2) We single-step T over the instruction at its new location. | |
914 | n3) We adjust the resulting register and memory state as directed | |
915 | by T's architecture. This includes resetting T's PC to point | |
916 | back into the main instruction stream. | |
917 | n4) We resume T. | |
918 | ||
919 | This approach depends on the following gdbarch methods: | |
920 | ||
921 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
922 | indicate where to copy the instruction, and how much space must | |
923 | be reserved there. We use these in step n1. | |
924 | ||
925 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
926 | address, and makes any necessary adjustments to the instruction, | |
927 | register contents, and memory. We use this in step n1. | |
928 | ||
929 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
930 | we have successfuly single-stepped the instruction, to yield the | |
931 | same effect the instruction would have had if we had executed it | |
932 | at its original address. We use this in step n3. | |
933 | ||
934 | - gdbarch_displaced_step_free_closure provides cleanup. | |
935 | ||
936 | The gdbarch_displaced_step_copy_insn and | |
937 | gdbarch_displaced_step_fixup functions must be written so that | |
938 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
939 | single-stepping across the copied instruction, and then applying | |
940 | gdbarch_displaced_insn_fixup should have the same effects on the | |
941 | thread's memory and registers as stepping the instruction in place | |
942 | would have. Exactly which responsibilities fall to the copy and | |
943 | which fall to the fixup is up to the author of those functions. | |
944 | ||
945 | See the comments in gdbarch.sh for details. | |
946 | ||
947 | Note that displaced stepping and software single-step cannot | |
948 | currently be used in combination, although with some care I think | |
949 | they could be made to. Software single-step works by placing | |
950 | breakpoints on all possible subsequent instructions; if the | |
951 | displaced instruction is a PC-relative jump, those breakpoints | |
952 | could fall in very strange places --- on pages that aren't | |
953 | executable, or at addresses that are not proper instruction | |
954 | boundaries. (We do generally let other threads run while we wait | |
955 | to hit the software single-step breakpoint, and they might | |
956 | encounter such a corrupted instruction.) One way to work around | |
957 | this would be to have gdbarch_displaced_step_copy_insn fully | |
958 | simulate the effect of PC-relative instructions (and return NULL) | |
959 | on architectures that use software single-stepping. | |
960 | ||
961 | In non-stop mode, we can have independent and simultaneous step | |
962 | requests, so more than one thread may need to simultaneously step | |
963 | over a breakpoint. The current implementation assumes there is | |
964 | only one scratch space per process. In this case, we have to | |
965 | serialize access to the scratch space. If thread A wants to step | |
966 | over a breakpoint, but we are currently waiting for some other | |
967 | thread to complete a displaced step, we leave thread A stopped and | |
968 | place it in the displaced_step_request_queue. Whenever a displaced | |
969 | step finishes, we pick the next thread in the queue and start a new | |
970 | displaced step operation on it. See displaced_step_prepare and | |
971 | displaced_step_fixup for details. */ | |
972 | ||
237fc4c9 PA |
973 | struct displaced_step_request |
974 | { | |
975 | ptid_t ptid; | |
976 | struct displaced_step_request *next; | |
977 | }; | |
978 | ||
fc1cf338 PA |
979 | /* Per-inferior displaced stepping state. */ |
980 | struct displaced_step_inferior_state | |
981 | { | |
982 | /* Pointer to next in linked list. */ | |
983 | struct displaced_step_inferior_state *next; | |
984 | ||
985 | /* The process this displaced step state refers to. */ | |
986 | int pid; | |
987 | ||
988 | /* A queue of pending displaced stepping requests. One entry per | |
989 | thread that needs to do a displaced step. */ | |
990 | struct displaced_step_request *step_request_queue; | |
991 | ||
992 | /* If this is not null_ptid, this is the thread carrying out a | |
993 | displaced single-step in process PID. This thread's state will | |
994 | require fixing up once it has completed its step. */ | |
995 | ptid_t step_ptid; | |
996 | ||
997 | /* The architecture the thread had when we stepped it. */ | |
998 | struct gdbarch *step_gdbarch; | |
999 | ||
1000 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
1001 | for post-step cleanup. */ | |
1002 | struct displaced_step_closure *step_closure; | |
1003 | ||
1004 | /* The address of the original instruction, and the copy we | |
1005 | made. */ | |
1006 | CORE_ADDR step_original, step_copy; | |
1007 | ||
1008 | /* Saved contents of copy area. */ | |
1009 | gdb_byte *step_saved_copy; | |
1010 | }; | |
1011 | ||
1012 | /* The list of states of processes involved in displaced stepping | |
1013 | presently. */ | |
1014 | static struct displaced_step_inferior_state *displaced_step_inferior_states; | |
1015 | ||
1016 | /* Get the displaced stepping state of process PID. */ | |
1017 | ||
1018 | static struct displaced_step_inferior_state * | |
1019 | get_displaced_stepping_state (int pid) | |
1020 | { | |
1021 | struct displaced_step_inferior_state *state; | |
1022 | ||
1023 | for (state = displaced_step_inferior_states; | |
1024 | state != NULL; | |
1025 | state = state->next) | |
1026 | if (state->pid == pid) | |
1027 | return state; | |
1028 | ||
1029 | return NULL; | |
1030 | } | |
1031 | ||
1032 | /* Add a new displaced stepping state for process PID to the displaced | |
1033 | stepping state list, or return a pointer to an already existing | |
1034 | entry, if it already exists. Never returns NULL. */ | |
1035 | ||
1036 | static struct displaced_step_inferior_state * | |
1037 | add_displaced_stepping_state (int pid) | |
1038 | { | |
1039 | struct displaced_step_inferior_state *state; | |
1040 | ||
1041 | for (state = displaced_step_inferior_states; | |
1042 | state != NULL; | |
1043 | state = state->next) | |
1044 | if (state->pid == pid) | |
1045 | return state; | |
237fc4c9 | 1046 | |
fc1cf338 PA |
1047 | state = xcalloc (1, sizeof (*state)); |
1048 | state->pid = pid; | |
1049 | state->next = displaced_step_inferior_states; | |
1050 | displaced_step_inferior_states = state; | |
237fc4c9 | 1051 | |
fc1cf338 PA |
1052 | return state; |
1053 | } | |
1054 | ||
1055 | /* Remove the displaced stepping state of process PID. */ | |
237fc4c9 | 1056 | |
fc1cf338 PA |
1057 | static void |
1058 | remove_displaced_stepping_state (int pid) | |
1059 | { | |
1060 | struct displaced_step_inferior_state *it, **prev_next_p; | |
237fc4c9 | 1061 | |
fc1cf338 PA |
1062 | gdb_assert (pid != 0); |
1063 | ||
1064 | it = displaced_step_inferior_states; | |
1065 | prev_next_p = &displaced_step_inferior_states; | |
1066 | while (it) | |
1067 | { | |
1068 | if (it->pid == pid) | |
1069 | { | |
1070 | *prev_next_p = it->next; | |
1071 | xfree (it); | |
1072 | return; | |
1073 | } | |
1074 | ||
1075 | prev_next_p = &it->next; | |
1076 | it = *prev_next_p; | |
1077 | } | |
1078 | } | |
1079 | ||
1080 | static void | |
1081 | infrun_inferior_exit (struct inferior *inf) | |
1082 | { | |
1083 | remove_displaced_stepping_state (inf->pid); | |
1084 | } | |
237fc4c9 | 1085 | |
fff08868 HZ |
1086 | /* Enum strings for "set|show displaced-stepping". */ |
1087 | ||
1088 | static const char can_use_displaced_stepping_auto[] = "auto"; | |
1089 | static const char can_use_displaced_stepping_on[] = "on"; | |
1090 | static const char can_use_displaced_stepping_off[] = "off"; | |
1091 | static const char *can_use_displaced_stepping_enum[] = | |
1092 | { | |
1093 | can_use_displaced_stepping_auto, | |
1094 | can_use_displaced_stepping_on, | |
1095 | can_use_displaced_stepping_off, | |
1096 | NULL, | |
1097 | }; | |
1098 | ||
1099 | /* If ON, and the architecture supports it, GDB will use displaced | |
1100 | stepping to step over breakpoints. If OFF, or if the architecture | |
1101 | doesn't support it, GDB will instead use the traditional | |
1102 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1103 | decide which technique to use to step over breakpoints depending on | |
1104 | which of all-stop or non-stop mode is active --- displaced stepping | |
1105 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1106 | ||
1107 | static const char *can_use_displaced_stepping = | |
1108 | can_use_displaced_stepping_auto; | |
1109 | ||
237fc4c9 PA |
1110 | static void |
1111 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1112 | struct cmd_list_element *c, | |
1113 | const char *value) | |
1114 | { | |
fff08868 HZ |
1115 | if (can_use_displaced_stepping == can_use_displaced_stepping_auto) |
1116 | fprintf_filtered (file, _("\ | |
1117 | Debugger's willingness to use displaced stepping to step over \ | |
1118 | breakpoints is %s (currently %s).\n"), | |
1119 | value, non_stop ? "on" : "off"); | |
1120 | else | |
1121 | fprintf_filtered (file, _("\ | |
1122 | Debugger's willingness to use displaced stepping to step over \ | |
1123 | breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1124 | } |
1125 | ||
fff08868 HZ |
1126 | /* Return non-zero if displaced stepping can/should be used to step |
1127 | over breakpoints. */ | |
1128 | ||
237fc4c9 PA |
1129 | static int |
1130 | use_displaced_stepping (struct gdbarch *gdbarch) | |
1131 | { | |
fff08868 HZ |
1132 | return (((can_use_displaced_stepping == can_use_displaced_stepping_auto |
1133 | && non_stop) | |
1134 | || can_use_displaced_stepping == can_use_displaced_stepping_on) | |
96429cc8 HZ |
1135 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
1136 | && !RECORD_IS_USED); | |
237fc4c9 PA |
1137 | } |
1138 | ||
1139 | /* Clean out any stray displaced stepping state. */ | |
1140 | static void | |
fc1cf338 | 1141 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1142 | { |
1143 | /* Indicate that there is no cleanup pending. */ | |
fc1cf338 | 1144 | displaced->step_ptid = null_ptid; |
237fc4c9 | 1145 | |
fc1cf338 | 1146 | if (displaced->step_closure) |
237fc4c9 | 1147 | { |
fc1cf338 PA |
1148 | gdbarch_displaced_step_free_closure (displaced->step_gdbarch, |
1149 | displaced->step_closure); | |
1150 | displaced->step_closure = NULL; | |
237fc4c9 PA |
1151 | } |
1152 | } | |
1153 | ||
1154 | static void | |
fc1cf338 | 1155 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1156 | { |
fc1cf338 PA |
1157 | struct displaced_step_inferior_state *state = arg; |
1158 | ||
1159 | displaced_step_clear (state); | |
237fc4c9 PA |
1160 | } |
1161 | ||
1162 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1163 | void | |
1164 | displaced_step_dump_bytes (struct ui_file *file, | |
1165 | const gdb_byte *buf, | |
1166 | size_t len) | |
1167 | { | |
1168 | int i; | |
1169 | ||
1170 | for (i = 0; i < len; i++) | |
1171 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1172 | fputs_unfiltered ("\n", file); | |
1173 | } | |
1174 | ||
1175 | /* Prepare to single-step, using displaced stepping. | |
1176 | ||
1177 | Note that we cannot use displaced stepping when we have a signal to | |
1178 | deliver. If we have a signal to deliver and an instruction to step | |
1179 | over, then after the step, there will be no indication from the | |
1180 | target whether the thread entered a signal handler or ignored the | |
1181 | signal and stepped over the instruction successfully --- both cases | |
1182 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1183 | fixup, and in the second case we must --- but we can't tell which. | |
1184 | Comments in the code for 'random signals' in handle_inferior_event | |
1185 | explain how we handle this case instead. | |
1186 | ||
1187 | Returns 1 if preparing was successful -- this thread is going to be | |
1188 | stepped now; or 0 if displaced stepping this thread got queued. */ | |
1189 | static int | |
1190 | displaced_step_prepare (ptid_t ptid) | |
1191 | { | |
ad53cd71 | 1192 | struct cleanup *old_cleanups, *ignore_cleanups; |
237fc4c9 PA |
1193 | struct regcache *regcache = get_thread_regcache (ptid); |
1194 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1195 | CORE_ADDR original, copy; | |
1196 | ULONGEST len; | |
1197 | struct displaced_step_closure *closure; | |
fc1cf338 | 1198 | struct displaced_step_inferior_state *displaced; |
237fc4c9 PA |
1199 | |
1200 | /* We should never reach this function if the architecture does not | |
1201 | support displaced stepping. */ | |
1202 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1203 | ||
fc1cf338 PA |
1204 | /* We have to displaced step one thread at a time, as we only have |
1205 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1206 | |
fc1cf338 PA |
1207 | displaced = add_displaced_stepping_state (ptid_get_pid (ptid)); |
1208 | ||
1209 | if (!ptid_equal (displaced->step_ptid, null_ptid)) | |
237fc4c9 PA |
1210 | { |
1211 | /* Already waiting for a displaced step to finish. Defer this | |
1212 | request and place in queue. */ | |
1213 | struct displaced_step_request *req, *new_req; | |
1214 | ||
1215 | if (debug_displaced) | |
1216 | fprintf_unfiltered (gdb_stdlog, | |
1217 | "displaced: defering step of %s\n", | |
1218 | target_pid_to_str (ptid)); | |
1219 | ||
1220 | new_req = xmalloc (sizeof (*new_req)); | |
1221 | new_req->ptid = ptid; | |
1222 | new_req->next = NULL; | |
1223 | ||
fc1cf338 | 1224 | if (displaced->step_request_queue) |
237fc4c9 | 1225 | { |
fc1cf338 | 1226 | for (req = displaced->step_request_queue; |
237fc4c9 PA |
1227 | req && req->next; |
1228 | req = req->next) | |
1229 | ; | |
1230 | req->next = new_req; | |
1231 | } | |
1232 | else | |
fc1cf338 | 1233 | displaced->step_request_queue = new_req; |
237fc4c9 PA |
1234 | |
1235 | return 0; | |
1236 | } | |
1237 | else | |
1238 | { | |
1239 | if (debug_displaced) | |
1240 | fprintf_unfiltered (gdb_stdlog, | |
1241 | "displaced: stepping %s now\n", | |
1242 | target_pid_to_str (ptid)); | |
1243 | } | |
1244 | ||
fc1cf338 | 1245 | displaced_step_clear (displaced); |
237fc4c9 | 1246 | |
ad53cd71 PA |
1247 | old_cleanups = save_inferior_ptid (); |
1248 | inferior_ptid = ptid; | |
1249 | ||
515630c5 | 1250 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1251 | |
1252 | copy = gdbarch_displaced_step_location (gdbarch); | |
1253 | len = gdbarch_max_insn_length (gdbarch); | |
1254 | ||
1255 | /* Save the original contents of the copy area. */ | |
fc1cf338 | 1256 | displaced->step_saved_copy = xmalloc (len); |
ad53cd71 | 1257 | ignore_cleanups = make_cleanup (free_current_contents, |
fc1cf338 PA |
1258 | &displaced->step_saved_copy); |
1259 | read_memory (copy, displaced->step_saved_copy, len); | |
237fc4c9 PA |
1260 | if (debug_displaced) |
1261 | { | |
5af949e3 UW |
1262 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1263 | paddress (gdbarch, copy)); | |
fc1cf338 PA |
1264 | displaced_step_dump_bytes (gdb_stdlog, |
1265 | displaced->step_saved_copy, | |
1266 | len); | |
237fc4c9 PA |
1267 | }; |
1268 | ||
1269 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1270 | original, copy, regcache); |
237fc4c9 PA |
1271 | |
1272 | /* We don't support the fully-simulated case at present. */ | |
1273 | gdb_assert (closure); | |
1274 | ||
9f5a595d UW |
1275 | /* Save the information we need to fix things up if the step |
1276 | succeeds. */ | |
fc1cf338 PA |
1277 | displaced->step_ptid = ptid; |
1278 | displaced->step_gdbarch = gdbarch; | |
1279 | displaced->step_closure = closure; | |
1280 | displaced->step_original = original; | |
1281 | displaced->step_copy = copy; | |
9f5a595d | 1282 | |
fc1cf338 | 1283 | make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1284 | |
1285 | /* Resume execution at the copy. */ | |
515630c5 | 1286 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1287 | |
ad53cd71 PA |
1288 | discard_cleanups (ignore_cleanups); |
1289 | ||
1290 | do_cleanups (old_cleanups); | |
237fc4c9 PA |
1291 | |
1292 | if (debug_displaced) | |
5af949e3 UW |
1293 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1294 | paddress (gdbarch, copy)); | |
237fc4c9 | 1295 | |
237fc4c9 PA |
1296 | return 1; |
1297 | } | |
1298 | ||
237fc4c9 PA |
1299 | static void |
1300 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, const gdb_byte *myaddr, int len) | |
1301 | { | |
1302 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
abbb1732 | 1303 | |
237fc4c9 PA |
1304 | inferior_ptid = ptid; |
1305 | write_memory (memaddr, myaddr, len); | |
1306 | do_cleanups (ptid_cleanup); | |
1307 | } | |
1308 | ||
1309 | static void | |
1310 | displaced_step_fixup (ptid_t event_ptid, enum target_signal signal) | |
1311 | { | |
1312 | struct cleanup *old_cleanups; | |
fc1cf338 PA |
1313 | struct displaced_step_inferior_state *displaced |
1314 | = get_displaced_stepping_state (ptid_get_pid (event_ptid)); | |
1315 | ||
1316 | /* Was any thread of this process doing a displaced step? */ | |
1317 | if (displaced == NULL) | |
1318 | return; | |
237fc4c9 PA |
1319 | |
1320 | /* Was this event for the pid we displaced? */ | |
fc1cf338 PA |
1321 | if (ptid_equal (displaced->step_ptid, null_ptid) |
1322 | || ! ptid_equal (displaced->step_ptid, event_ptid)) | |
237fc4c9 PA |
1323 | return; |
1324 | ||
fc1cf338 | 1325 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1326 | |
1327 | /* Restore the contents of the copy area. */ | |
1328 | { | |
fc1cf338 | 1329 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); |
abbb1732 | 1330 | |
fc1cf338 PA |
1331 | write_memory_ptid (displaced->step_ptid, displaced->step_copy, |
1332 | displaced->step_saved_copy, len); | |
237fc4c9 | 1333 | if (debug_displaced) |
5af949e3 | 1334 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s\n", |
fc1cf338 PA |
1335 | paddress (displaced->step_gdbarch, |
1336 | displaced->step_copy)); | |
237fc4c9 PA |
1337 | } |
1338 | ||
1339 | /* Did the instruction complete successfully? */ | |
1340 | if (signal == TARGET_SIGNAL_TRAP) | |
1341 | { | |
1342 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
1343 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
1344 | displaced->step_closure, | |
1345 | displaced->step_original, | |
1346 | displaced->step_copy, | |
1347 | get_thread_regcache (displaced->step_ptid)); | |
237fc4c9 PA |
1348 | } |
1349 | else | |
1350 | { | |
1351 | /* Since the instruction didn't complete, all we can do is | |
1352 | relocate the PC. */ | |
515630c5 UW |
1353 | struct regcache *regcache = get_thread_regcache (event_ptid); |
1354 | CORE_ADDR pc = regcache_read_pc (regcache); | |
abbb1732 | 1355 | |
fc1cf338 | 1356 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1357 | regcache_write_pc (regcache, pc); |
237fc4c9 PA |
1358 | } |
1359 | ||
1360 | do_cleanups (old_cleanups); | |
1361 | ||
fc1cf338 | 1362 | displaced->step_ptid = null_ptid; |
1c5cfe86 | 1363 | |
237fc4c9 | 1364 | /* Are there any pending displaced stepping requests? If so, run |
fc1cf338 PA |
1365 | one now. Leave the state object around, since we're likely to |
1366 | need it again soon. */ | |
1367 | while (displaced->step_request_queue) | |
237fc4c9 PA |
1368 | { |
1369 | struct displaced_step_request *head; | |
1370 | ptid_t ptid; | |
5af949e3 | 1371 | struct regcache *regcache; |
929dfd4f | 1372 | struct gdbarch *gdbarch; |
1c5cfe86 | 1373 | CORE_ADDR actual_pc; |
6c95b8df | 1374 | struct address_space *aspace; |
237fc4c9 | 1375 | |
fc1cf338 | 1376 | head = displaced->step_request_queue; |
237fc4c9 | 1377 | ptid = head->ptid; |
fc1cf338 | 1378 | displaced->step_request_queue = head->next; |
237fc4c9 PA |
1379 | xfree (head); |
1380 | ||
ad53cd71 PA |
1381 | context_switch (ptid); |
1382 | ||
5af949e3 UW |
1383 | regcache = get_thread_regcache (ptid); |
1384 | actual_pc = regcache_read_pc (regcache); | |
6c95b8df | 1385 | aspace = get_regcache_aspace (regcache); |
1c5cfe86 | 1386 | |
6c95b8df | 1387 | if (breakpoint_here_p (aspace, actual_pc)) |
ad53cd71 | 1388 | { |
1c5cfe86 PA |
1389 | if (debug_displaced) |
1390 | fprintf_unfiltered (gdb_stdlog, | |
1391 | "displaced: stepping queued %s now\n", | |
1392 | target_pid_to_str (ptid)); | |
1393 | ||
1394 | displaced_step_prepare (ptid); | |
1395 | ||
929dfd4f JB |
1396 | gdbarch = get_regcache_arch (regcache); |
1397 | ||
1c5cfe86 PA |
1398 | if (debug_displaced) |
1399 | { | |
929dfd4f | 1400 | CORE_ADDR actual_pc = regcache_read_pc (regcache); |
1c5cfe86 PA |
1401 | gdb_byte buf[4]; |
1402 | ||
5af949e3 UW |
1403 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", |
1404 | paddress (gdbarch, actual_pc)); | |
1c5cfe86 PA |
1405 | read_memory (actual_pc, buf, sizeof (buf)); |
1406 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1407 | } | |
1408 | ||
fc1cf338 PA |
1409 | if (gdbarch_displaced_step_hw_singlestep (gdbarch, |
1410 | displaced->step_closure)) | |
929dfd4f | 1411 | target_resume (ptid, 1, TARGET_SIGNAL_0); |
99e40580 UW |
1412 | else |
1413 | target_resume (ptid, 0, TARGET_SIGNAL_0); | |
1c5cfe86 PA |
1414 | |
1415 | /* Done, we're stepping a thread. */ | |
1416 | break; | |
ad53cd71 | 1417 | } |
1c5cfe86 PA |
1418 | else |
1419 | { | |
1420 | int step; | |
1421 | struct thread_info *tp = inferior_thread (); | |
1422 | ||
1423 | /* The breakpoint we were sitting under has since been | |
1424 | removed. */ | |
1425 | tp->trap_expected = 0; | |
1426 | ||
1427 | /* Go back to what we were trying to do. */ | |
1428 | step = currently_stepping (tp); | |
ad53cd71 | 1429 | |
1c5cfe86 PA |
1430 | if (debug_displaced) |
1431 | fprintf_unfiltered (gdb_stdlog, "breakpoint is gone %s: step(%d)\n", | |
1432 | target_pid_to_str (tp->ptid), step); | |
1433 | ||
1434 | target_resume (ptid, step, TARGET_SIGNAL_0); | |
1435 | tp->stop_signal = TARGET_SIGNAL_0; | |
1436 | ||
1437 | /* This request was discarded. See if there's any other | |
1438 | thread waiting for its turn. */ | |
1439 | } | |
237fc4c9 PA |
1440 | } |
1441 | } | |
1442 | ||
5231c1fd PA |
1443 | /* Update global variables holding ptids to hold NEW_PTID if they were |
1444 | holding OLD_PTID. */ | |
1445 | static void | |
1446 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
1447 | { | |
1448 | struct displaced_step_request *it; | |
fc1cf338 | 1449 | struct displaced_step_inferior_state *displaced; |
5231c1fd PA |
1450 | |
1451 | if (ptid_equal (inferior_ptid, old_ptid)) | |
1452 | inferior_ptid = new_ptid; | |
1453 | ||
1454 | if (ptid_equal (singlestep_ptid, old_ptid)) | |
1455 | singlestep_ptid = new_ptid; | |
1456 | ||
5231c1fd PA |
1457 | if (ptid_equal (deferred_step_ptid, old_ptid)) |
1458 | deferred_step_ptid = new_ptid; | |
1459 | ||
fc1cf338 PA |
1460 | for (displaced = displaced_step_inferior_states; |
1461 | displaced; | |
1462 | displaced = displaced->next) | |
1463 | { | |
1464 | if (ptid_equal (displaced->step_ptid, old_ptid)) | |
1465 | displaced->step_ptid = new_ptid; | |
1466 | ||
1467 | for (it = displaced->step_request_queue; it; it = it->next) | |
1468 | if (ptid_equal (it->ptid, old_ptid)) | |
1469 | it->ptid = new_ptid; | |
1470 | } | |
5231c1fd PA |
1471 | } |
1472 | ||
237fc4c9 PA |
1473 | \f |
1474 | /* Resuming. */ | |
c906108c SS |
1475 | |
1476 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 1477 | static void |
74b7792f | 1478 | resume_cleanups (void *ignore) |
c906108c SS |
1479 | { |
1480 | normal_stop (); | |
1481 | } | |
1482 | ||
53904c9e AC |
1483 | static const char schedlock_off[] = "off"; |
1484 | static const char schedlock_on[] = "on"; | |
1485 | static const char schedlock_step[] = "step"; | |
488f131b | 1486 | static const char *scheduler_enums[] = { |
ef346e04 AC |
1487 | schedlock_off, |
1488 | schedlock_on, | |
1489 | schedlock_step, | |
1490 | NULL | |
1491 | }; | |
920d2a44 AC |
1492 | static const char *scheduler_mode = schedlock_off; |
1493 | static void | |
1494 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
1495 | struct cmd_list_element *c, const char *value) | |
1496 | { | |
1497 | fprintf_filtered (file, _("\ | |
1498 | Mode for locking scheduler during execution is \"%s\".\n"), | |
1499 | value); | |
1500 | } | |
c906108c SS |
1501 | |
1502 | static void | |
96baa820 | 1503 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 1504 | { |
eefe576e AC |
1505 | if (!target_can_lock_scheduler) |
1506 | { | |
1507 | scheduler_mode = schedlock_off; | |
1508 | error (_("Target '%s' cannot support this command."), target_shortname); | |
1509 | } | |
c906108c SS |
1510 | } |
1511 | ||
d4db2f36 PA |
1512 | /* True if execution commands resume all threads of all processes by |
1513 | default; otherwise, resume only threads of the current inferior | |
1514 | process. */ | |
1515 | int sched_multi = 0; | |
1516 | ||
2facfe5c DD |
1517 | /* Try to setup for software single stepping over the specified location. |
1518 | Return 1 if target_resume() should use hardware single step. | |
1519 | ||
1520 | GDBARCH the current gdbarch. | |
1521 | PC the location to step over. */ | |
1522 | ||
1523 | static int | |
1524 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1525 | { | |
1526 | int hw_step = 1; | |
1527 | ||
f02253f1 HZ |
1528 | if (execution_direction == EXEC_FORWARD |
1529 | && gdbarch_software_single_step_p (gdbarch) | |
99e40580 | 1530 | && gdbarch_software_single_step (gdbarch, get_current_frame ())) |
2facfe5c | 1531 | { |
99e40580 UW |
1532 | hw_step = 0; |
1533 | /* Do not pull these breakpoints until after a `wait' in | |
1534 | `wait_for_inferior' */ | |
1535 | singlestep_breakpoints_inserted_p = 1; | |
1536 | singlestep_ptid = inferior_ptid; | |
1537 | singlestep_pc = pc; | |
2facfe5c DD |
1538 | } |
1539 | return hw_step; | |
1540 | } | |
c906108c SS |
1541 | |
1542 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
1543 | wants to interrupt some lengthy single-stepping operation | |
1544 | (for child processes, the SIGINT goes to the inferior, and so | |
1545 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
1546 | other targets, that's not true). | |
1547 | ||
1548 | STEP nonzero if we should step (zero to continue instead). | |
1549 | SIG is the signal to give the inferior (zero for none). */ | |
1550 | void | |
96baa820 | 1551 | resume (int step, enum target_signal sig) |
c906108c SS |
1552 | { |
1553 | int should_resume = 1; | |
74b7792f | 1554 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
1555 | struct regcache *regcache = get_current_regcache (); |
1556 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4e1c45ea | 1557 | struct thread_info *tp = inferior_thread (); |
515630c5 | 1558 | CORE_ADDR pc = regcache_read_pc (regcache); |
6c95b8df | 1559 | struct address_space *aspace = get_regcache_aspace (regcache); |
c7e8a53c | 1560 | |
c906108c SS |
1561 | QUIT; |
1562 | ||
74609e71 YQ |
1563 | if (current_inferior ()->waiting_for_vfork_done) |
1564 | { | |
48f9886d PA |
1565 | /* Don't try to single-step a vfork parent that is waiting for |
1566 | the child to get out of the shared memory region (by exec'ing | |
1567 | or exiting). This is particularly important on software | |
1568 | single-step archs, as the child process would trip on the | |
1569 | software single step breakpoint inserted for the parent | |
1570 | process. Since the parent will not actually execute any | |
1571 | instruction until the child is out of the shared region (such | |
1572 | are vfork's semantics), it is safe to simply continue it. | |
1573 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
1574 | the parent, and tell it to `keep_going', which automatically | |
1575 | re-sets it stepping. */ | |
74609e71 YQ |
1576 | if (debug_infrun) |
1577 | fprintf_unfiltered (gdb_stdlog, | |
1578 | "infrun: resume : clear step\n"); | |
1579 | step = 0; | |
1580 | } | |
1581 | ||
527159b7 | 1582 | if (debug_infrun) |
237fc4c9 PA |
1583 | fprintf_unfiltered (gdb_stdlog, |
1584 | "infrun: resume (step=%d, signal=%d), " | |
4e1c45ea PA |
1585 | "trap_expected=%d\n", |
1586 | step, sig, tp->trap_expected); | |
c906108c | 1587 | |
c2c6d25f JM |
1588 | /* Normally, by the time we reach `resume', the breakpoints are either |
1589 | removed or inserted, as appropriate. The exception is if we're sitting | |
1590 | at a permanent breakpoint; we need to step over it, but permanent | |
1591 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 1592 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 1593 | { |
515630c5 UW |
1594 | if (gdbarch_skip_permanent_breakpoint_p (gdbarch)) |
1595 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
6d350bb5 UW |
1596 | else |
1597 | error (_("\ | |
1598 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
1599 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
1600 | a command like `return' or `jump' to continue execution.")); | |
1601 | } | |
c2c6d25f | 1602 | |
237fc4c9 PA |
1603 | /* If enabled, step over breakpoints by executing a copy of the |
1604 | instruction at a different address. | |
1605 | ||
1606 | We can't use displaced stepping when we have a signal to deliver; | |
1607 | the comments for displaced_step_prepare explain why. The | |
1608 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
1609 | signals' explain what we do instead. |
1610 | ||
1611 | We can't use displaced stepping when we are waiting for vfork_done | |
1612 | event, displaced stepping breaks the vfork child similarly as single | |
1613 | step software breakpoint. */ | |
515630c5 | 1614 | if (use_displaced_stepping (gdbarch) |
929dfd4f JB |
1615 | && (tp->trap_expected |
1616 | || (step && gdbarch_software_single_step_p (gdbarch))) | |
74609e71 YQ |
1617 | && sig == TARGET_SIGNAL_0 |
1618 | && !current_inferior ()->waiting_for_vfork_done) | |
237fc4c9 | 1619 | { |
fc1cf338 PA |
1620 | struct displaced_step_inferior_state *displaced; |
1621 | ||
237fc4c9 | 1622 | if (!displaced_step_prepare (inferior_ptid)) |
d56b7306 VP |
1623 | { |
1624 | /* Got placed in displaced stepping queue. Will be resumed | |
1625 | later when all the currently queued displaced stepping | |
7f7efbd9 VP |
1626 | requests finish. The thread is not executing at this point, |
1627 | and the call to set_executing will be made later. But we | |
1628 | need to call set_running here, since from frontend point of view, | |
1629 | the thread is running. */ | |
1630 | set_running (inferior_ptid, 1); | |
d56b7306 VP |
1631 | discard_cleanups (old_cleanups); |
1632 | return; | |
1633 | } | |
99e40580 | 1634 | |
fc1cf338 PA |
1635 | displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); |
1636 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, | |
1637 | displaced->step_closure); | |
237fc4c9 PA |
1638 | } |
1639 | ||
2facfe5c | 1640 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 1641 | else if (step) |
2facfe5c | 1642 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 1643 | |
c906108c SS |
1644 | if (should_resume) |
1645 | { | |
39f77062 | 1646 | ptid_t resume_ptid; |
dfcd3bfb | 1647 | |
cd76b0b7 VP |
1648 | /* If STEP is set, it's a request to use hardware stepping |
1649 | facilities. But in that case, we should never | |
1650 | use singlestep breakpoint. */ | |
1651 | gdb_assert (!(singlestep_breakpoints_inserted_p && step)); | |
1652 | ||
d4db2f36 PA |
1653 | /* Decide the set of threads to ask the target to resume. Start |
1654 | by assuming everything will be resumed, than narrow the set | |
1655 | by applying increasingly restricting conditions. */ | |
1656 | ||
1657 | /* By default, resume all threads of all processes. */ | |
1658 | resume_ptid = RESUME_ALL; | |
1659 | ||
1660 | /* Maybe resume only all threads of the current process. */ | |
1661 | if (!sched_multi && target_supports_multi_process ()) | |
1662 | { | |
1663 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
1664 | } | |
1665 | ||
1666 | /* Maybe resume a single thread after all. */ | |
cd76b0b7 VP |
1667 | if (singlestep_breakpoints_inserted_p |
1668 | && stepping_past_singlestep_breakpoint) | |
c906108c | 1669 | { |
cd76b0b7 VP |
1670 | /* The situation here is as follows. In thread T1 we wanted to |
1671 | single-step. Lacking hardware single-stepping we've | |
1672 | set breakpoint at the PC of the next instruction -- call it | |
1673 | P. After resuming, we've hit that breakpoint in thread T2. | |
1674 | Now we've removed original breakpoint, inserted breakpoint | |
1675 | at P+1, and try to step to advance T2 past breakpoint. | |
1676 | We need to step only T2, as if T1 is allowed to freely run, | |
1677 | it can run past P, and if other threads are allowed to run, | |
1678 | they can hit breakpoint at P+1, and nested hits of single-step | |
1679 | breakpoints is not something we'd want -- that's complicated | |
1680 | to support, and has no value. */ | |
1681 | resume_ptid = inferior_ptid; | |
1682 | } | |
d4db2f36 PA |
1683 | else if ((step || singlestep_breakpoints_inserted_p) |
1684 | && tp->trap_expected) | |
cd76b0b7 | 1685 | { |
74960c60 VP |
1686 | /* We're allowing a thread to run past a breakpoint it has |
1687 | hit, by single-stepping the thread with the breakpoint | |
1688 | removed. In which case, we need to single-step only this | |
1689 | thread, and keep others stopped, as they can miss this | |
1690 | breakpoint if allowed to run. | |
1691 | ||
1692 | The current code actually removes all breakpoints when | |
1693 | doing this, not just the one being stepped over, so if we | |
1694 | let other threads run, we can actually miss any | |
1695 | breakpoint, not just the one at PC. */ | |
ef5cf84e | 1696 | resume_ptid = inferior_ptid; |
c906108c | 1697 | } |
d4db2f36 | 1698 | else if (non_stop) |
94cc34af PA |
1699 | { |
1700 | /* With non-stop mode on, threads are always handled | |
1701 | individually. */ | |
1702 | resume_ptid = inferior_ptid; | |
1703 | } | |
1704 | else if ((scheduler_mode == schedlock_on) | |
1705 | || (scheduler_mode == schedlock_step | |
1706 | && (step || singlestep_breakpoints_inserted_p))) | |
c906108c | 1707 | { |
ef5cf84e | 1708 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 1709 | resume_ptid = inferior_ptid; |
c906108c | 1710 | } |
ef5cf84e | 1711 | |
515630c5 | 1712 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4ed33b9 AC |
1713 | { |
1714 | /* Most targets can step a breakpoint instruction, thus | |
1715 | executing it normally. But if this one cannot, just | |
1716 | continue and we will hit it anyway. */ | |
6c95b8df | 1717 | if (step && breakpoint_inserted_here_p (aspace, pc)) |
c4ed33b9 AC |
1718 | step = 0; |
1719 | } | |
237fc4c9 PA |
1720 | |
1721 | if (debug_displaced | |
515630c5 | 1722 | && use_displaced_stepping (gdbarch) |
4e1c45ea | 1723 | && tp->trap_expected) |
237fc4c9 | 1724 | { |
515630c5 | 1725 | struct regcache *resume_regcache = get_thread_regcache (resume_ptid); |
5af949e3 | 1726 | struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache); |
515630c5 | 1727 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
237fc4c9 PA |
1728 | gdb_byte buf[4]; |
1729 | ||
5af949e3 UW |
1730 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", |
1731 | paddress (resume_gdbarch, actual_pc)); | |
237fc4c9 PA |
1732 | read_memory (actual_pc, buf, sizeof (buf)); |
1733 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1734 | } | |
1735 | ||
e58b0e63 PA |
1736 | /* Install inferior's terminal modes. */ |
1737 | target_terminal_inferior (); | |
1738 | ||
2020b7ab PA |
1739 | /* Avoid confusing the next resume, if the next stop/resume |
1740 | happens to apply to another thread. */ | |
1741 | tp->stop_signal = TARGET_SIGNAL_0; | |
607cecd2 PA |
1742 | |
1743 | target_resume (resume_ptid, step, sig); | |
c906108c SS |
1744 | } |
1745 | ||
1746 | discard_cleanups (old_cleanups); | |
1747 | } | |
1748 | \f | |
237fc4c9 | 1749 | /* Proceeding. */ |
c906108c SS |
1750 | |
1751 | /* Clear out all variables saying what to do when inferior is continued. | |
1752 | First do this, then set the ones you want, then call `proceed'. */ | |
1753 | ||
a7212384 UW |
1754 | static void |
1755 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 1756 | { |
a7212384 UW |
1757 | if (debug_infrun) |
1758 | fprintf_unfiltered (gdb_stdlog, | |
1759 | "infrun: clear_proceed_status_thread (%s)\n", | |
1760 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 1761 | |
a7212384 UW |
1762 | tp->trap_expected = 0; |
1763 | tp->step_range_start = 0; | |
1764 | tp->step_range_end = 0; | |
1765 | tp->step_frame_id = null_frame_id; | |
edb3359d | 1766 | tp->step_stack_frame_id = null_frame_id; |
a7212384 UW |
1767 | tp->step_over_calls = STEP_OVER_UNDEBUGGABLE; |
1768 | tp->stop_requested = 0; | |
4e1c45ea | 1769 | |
a7212384 | 1770 | tp->stop_step = 0; |
32400beb | 1771 | |
a7212384 | 1772 | tp->proceed_to_finish = 0; |
414c69f7 | 1773 | |
a7212384 UW |
1774 | /* Discard any remaining commands or status from previous stop. */ |
1775 | bpstat_clear (&tp->stop_bpstat); | |
1776 | } | |
32400beb | 1777 | |
a7212384 UW |
1778 | static int |
1779 | clear_proceed_status_callback (struct thread_info *tp, void *data) | |
1780 | { | |
1781 | if (is_exited (tp->ptid)) | |
1782 | return 0; | |
d6b48e9c | 1783 | |
a7212384 UW |
1784 | clear_proceed_status_thread (tp); |
1785 | return 0; | |
1786 | } | |
1787 | ||
1788 | void | |
1789 | clear_proceed_status (void) | |
1790 | { | |
6c95b8df PA |
1791 | if (!non_stop) |
1792 | { | |
1793 | /* In all-stop mode, delete the per-thread status of all | |
1794 | threads, even if inferior_ptid is null_ptid, there may be | |
1795 | threads on the list. E.g., we may be launching a new | |
1796 | process, while selecting the executable. */ | |
1797 | iterate_over_threads (clear_proceed_status_callback, NULL); | |
1798 | } | |
1799 | ||
a7212384 UW |
1800 | if (!ptid_equal (inferior_ptid, null_ptid)) |
1801 | { | |
1802 | struct inferior *inferior; | |
1803 | ||
1804 | if (non_stop) | |
1805 | { | |
6c95b8df PA |
1806 | /* If in non-stop mode, only delete the per-thread status of |
1807 | the current thread. */ | |
a7212384 UW |
1808 | clear_proceed_status_thread (inferior_thread ()); |
1809 | } | |
6c95b8df | 1810 | |
d6b48e9c PA |
1811 | inferior = current_inferior (); |
1812 | inferior->stop_soon = NO_STOP_QUIETLY; | |
4e1c45ea PA |
1813 | } |
1814 | ||
c906108c | 1815 | stop_after_trap = 0; |
f3b1572e PA |
1816 | |
1817 | observer_notify_about_to_proceed (); | |
c906108c | 1818 | |
d5c31457 UW |
1819 | if (stop_registers) |
1820 | { | |
1821 | regcache_xfree (stop_registers); | |
1822 | stop_registers = NULL; | |
1823 | } | |
c906108c SS |
1824 | } |
1825 | ||
5a437975 DE |
1826 | /* Check the current thread against the thread that reported the most recent |
1827 | event. If a step-over is required return TRUE and set the current thread | |
1828 | to the old thread. Otherwise return FALSE. | |
1829 | ||
1830 | This should be suitable for any targets that support threads. */ | |
ea67f13b DJ |
1831 | |
1832 | static int | |
6a6b96b9 | 1833 | prepare_to_proceed (int step) |
ea67f13b DJ |
1834 | { |
1835 | ptid_t wait_ptid; | |
1836 | struct target_waitstatus wait_status; | |
5a437975 DE |
1837 | int schedlock_enabled; |
1838 | ||
1839 | /* With non-stop mode on, threads are always handled individually. */ | |
1840 | gdb_assert (! non_stop); | |
ea67f13b DJ |
1841 | |
1842 | /* Get the last target status returned by target_wait(). */ | |
1843 | get_last_target_status (&wait_ptid, &wait_status); | |
1844 | ||
6a6b96b9 | 1845 | /* Make sure we were stopped at a breakpoint. */ |
ea67f13b | 1846 | if (wait_status.kind != TARGET_WAITKIND_STOPPED |
2b009048 DJ |
1847 | || (wait_status.value.sig != TARGET_SIGNAL_TRAP |
1848 | && wait_status.value.sig != TARGET_SIGNAL_ILL | |
1849 | && wait_status.value.sig != TARGET_SIGNAL_SEGV | |
1850 | && wait_status.value.sig != TARGET_SIGNAL_EMT)) | |
ea67f13b DJ |
1851 | { |
1852 | return 0; | |
1853 | } | |
1854 | ||
5a437975 DE |
1855 | schedlock_enabled = (scheduler_mode == schedlock_on |
1856 | || (scheduler_mode == schedlock_step | |
1857 | && step)); | |
1858 | ||
d4db2f36 PA |
1859 | /* Don't switch over to WAIT_PTID if scheduler locking is on. */ |
1860 | if (schedlock_enabled) | |
1861 | return 0; | |
1862 | ||
1863 | /* Don't switch over if we're about to resume some other process | |
1864 | other than WAIT_PTID's, and schedule-multiple is off. */ | |
1865 | if (!sched_multi | |
1866 | && ptid_get_pid (wait_ptid) != ptid_get_pid (inferior_ptid)) | |
1867 | return 0; | |
1868 | ||
6a6b96b9 | 1869 | /* Switched over from WAIT_PID. */ |
ea67f13b | 1870 | if (!ptid_equal (wait_ptid, minus_one_ptid) |
d4db2f36 | 1871 | && !ptid_equal (inferior_ptid, wait_ptid)) |
ea67f13b | 1872 | { |
515630c5 UW |
1873 | struct regcache *regcache = get_thread_regcache (wait_ptid); |
1874 | ||
6c95b8df PA |
1875 | if (breakpoint_here_p (get_regcache_aspace (regcache), |
1876 | regcache_read_pc (regcache))) | |
ea67f13b | 1877 | { |
515630c5 UW |
1878 | /* If stepping, remember current thread to switch back to. */ |
1879 | if (step) | |
1880 | deferred_step_ptid = inferior_ptid; | |
ea67f13b | 1881 | |
515630c5 UW |
1882 | /* Switch back to WAIT_PID thread. */ |
1883 | switch_to_thread (wait_ptid); | |
6a6b96b9 | 1884 | |
515630c5 UW |
1885 | /* We return 1 to indicate that there is a breakpoint here, |
1886 | so we need to step over it before continuing to avoid | |
1887 | hitting it straight away. */ | |
1888 | return 1; | |
1889 | } | |
ea67f13b DJ |
1890 | } |
1891 | ||
1892 | return 0; | |
ea67f13b | 1893 | } |
e4846b08 | 1894 | |
c906108c SS |
1895 | /* Basic routine for continuing the program in various fashions. |
1896 | ||
1897 | ADDR is the address to resume at, or -1 for resume where stopped. | |
1898 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 1899 | or -1 for act according to how it stopped. |
c906108c | 1900 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
1901 | -1 means return after that and print nothing. |
1902 | You should probably set various step_... variables | |
1903 | before calling here, if you are stepping. | |
c906108c SS |
1904 | |
1905 | You should call clear_proceed_status before calling proceed. */ | |
1906 | ||
1907 | void | |
96baa820 | 1908 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c | 1909 | { |
e58b0e63 PA |
1910 | struct regcache *regcache; |
1911 | struct gdbarch *gdbarch; | |
4e1c45ea | 1912 | struct thread_info *tp; |
e58b0e63 | 1913 | CORE_ADDR pc; |
6c95b8df | 1914 | struct address_space *aspace; |
c906108c SS |
1915 | int oneproc = 0; |
1916 | ||
e58b0e63 PA |
1917 | /* If we're stopped at a fork/vfork, follow the branch set by the |
1918 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
1919 | resuming the current thread. */ | |
1920 | if (!follow_fork ()) | |
1921 | { | |
1922 | /* The target for some reason decided not to resume. */ | |
1923 | normal_stop (); | |
1924 | return; | |
1925 | } | |
1926 | ||
1927 | regcache = get_current_regcache (); | |
1928 | gdbarch = get_regcache_arch (regcache); | |
6c95b8df | 1929 | aspace = get_regcache_aspace (regcache); |
e58b0e63 PA |
1930 | pc = regcache_read_pc (regcache); |
1931 | ||
c906108c | 1932 | if (step > 0) |
515630c5 | 1933 | step_start_function = find_pc_function (pc); |
c906108c SS |
1934 | if (step < 0) |
1935 | stop_after_trap = 1; | |
1936 | ||
2acceee2 | 1937 | if (addr == (CORE_ADDR) -1) |
c906108c | 1938 | { |
6c95b8df | 1939 | if (pc == stop_pc && breakpoint_here_p (aspace, pc) |
b2175913 | 1940 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
1941 | /* There is a breakpoint at the address we will resume at, |
1942 | step one instruction before inserting breakpoints so that | |
1943 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
1944 | breakpoint). |
1945 | ||
1946 | Note, we don't do this in reverse, because we won't | |
1947 | actually be executing the breakpoint insn anyway. | |
1948 | We'll be (un-)executing the previous instruction. */ | |
1949 | ||
c906108c | 1950 | oneproc = 1; |
515630c5 UW |
1951 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
1952 | && gdbarch_single_step_through_delay (gdbarch, | |
1953 | get_current_frame ())) | |
3352ef37 AC |
1954 | /* We stepped onto an instruction that needs to be stepped |
1955 | again before re-inserting the breakpoint, do so. */ | |
c906108c SS |
1956 | oneproc = 1; |
1957 | } | |
1958 | else | |
1959 | { | |
515630c5 | 1960 | regcache_write_pc (regcache, addr); |
c906108c SS |
1961 | } |
1962 | ||
527159b7 | 1963 | if (debug_infrun) |
8a9de0e4 | 1964 | fprintf_unfiltered (gdb_stdlog, |
5af949e3 UW |
1965 | "infrun: proceed (addr=%s, signal=%d, step=%d)\n", |
1966 | paddress (gdbarch, addr), siggnal, step); | |
527159b7 | 1967 | |
06cd862c PA |
1968 | /* We're handling a live event, so make sure we're doing live |
1969 | debugging. If we're looking at traceframes while the target is | |
1970 | running, we're going to need to get back to that mode after | |
1971 | handling the event. */ | |
1972 | if (non_stop) | |
1973 | { | |
1974 | make_cleanup_restore_current_traceframe (); | |
1975 | set_traceframe_number (-1); | |
1976 | } | |
1977 | ||
94cc34af PA |
1978 | if (non_stop) |
1979 | /* In non-stop, each thread is handled individually. The context | |
1980 | must already be set to the right thread here. */ | |
1981 | ; | |
1982 | else | |
1983 | { | |
1984 | /* In a multi-threaded task we may select another thread and | |
1985 | then continue or step. | |
c906108c | 1986 | |
94cc34af PA |
1987 | But if the old thread was stopped at a breakpoint, it will |
1988 | immediately cause another breakpoint stop without any | |
1989 | execution (i.e. it will report a breakpoint hit incorrectly). | |
1990 | So we must step over it first. | |
c906108c | 1991 | |
94cc34af PA |
1992 | prepare_to_proceed checks the current thread against the |
1993 | thread that reported the most recent event. If a step-over | |
1994 | is required it returns TRUE and sets the current thread to | |
1995 | the old thread. */ | |
1996 | if (prepare_to_proceed (step)) | |
1997 | oneproc = 1; | |
1998 | } | |
c906108c | 1999 | |
4e1c45ea PA |
2000 | /* prepare_to_proceed may change the current thread. */ |
2001 | tp = inferior_thread (); | |
2002 | ||
c906108c | 2003 | if (oneproc) |
74960c60 | 2004 | { |
4e1c45ea | 2005 | tp->trap_expected = 1; |
237fc4c9 PA |
2006 | /* If displaced stepping is enabled, we can step over the |
2007 | breakpoint without hitting it, so leave all breakpoints | |
2008 | inserted. Otherwise we need to disable all breakpoints, step | |
2009 | one instruction, and then re-add them when that step is | |
2010 | finished. */ | |
515630c5 | 2011 | if (!use_displaced_stepping (gdbarch)) |
237fc4c9 | 2012 | remove_breakpoints (); |
74960c60 | 2013 | } |
237fc4c9 PA |
2014 | |
2015 | /* We can insert breakpoints if we're not trying to step over one, | |
2016 | or if we are stepping over one but we're using displaced stepping | |
2017 | to do so. */ | |
4e1c45ea | 2018 | if (! tp->trap_expected || use_displaced_stepping (gdbarch)) |
c36b740a | 2019 | insert_breakpoints (); |
c906108c | 2020 | |
2020b7ab PA |
2021 | if (!non_stop) |
2022 | { | |
2023 | /* Pass the last stop signal to the thread we're resuming, | |
2024 | irrespective of whether the current thread is the thread that | |
2025 | got the last event or not. This was historically GDB's | |
2026 | behaviour before keeping a stop_signal per thread. */ | |
2027 | ||
2028 | struct thread_info *last_thread; | |
2029 | ptid_t last_ptid; | |
2030 | struct target_waitstatus last_status; | |
2031 | ||
2032 | get_last_target_status (&last_ptid, &last_status); | |
2033 | if (!ptid_equal (inferior_ptid, last_ptid) | |
2034 | && !ptid_equal (last_ptid, null_ptid) | |
2035 | && !ptid_equal (last_ptid, minus_one_ptid)) | |
2036 | { | |
e09875d4 | 2037 | last_thread = find_thread_ptid (last_ptid); |
2020b7ab PA |
2038 | if (last_thread) |
2039 | { | |
2040 | tp->stop_signal = last_thread->stop_signal; | |
2041 | last_thread->stop_signal = TARGET_SIGNAL_0; | |
2042 | } | |
2043 | } | |
2044 | } | |
2045 | ||
c906108c | 2046 | if (siggnal != TARGET_SIGNAL_DEFAULT) |
2020b7ab | 2047 | tp->stop_signal = siggnal; |
c906108c SS |
2048 | /* If this signal should not be seen by program, |
2049 | give it zero. Used for debugging signals. */ | |
2020b7ab PA |
2050 | else if (!signal_program[tp->stop_signal]) |
2051 | tp->stop_signal = TARGET_SIGNAL_0; | |
c906108c SS |
2052 | |
2053 | annotate_starting (); | |
2054 | ||
2055 | /* Make sure that output from GDB appears before output from the | |
2056 | inferior. */ | |
2057 | gdb_flush (gdb_stdout); | |
2058 | ||
e4846b08 JJ |
2059 | /* Refresh prev_pc value just prior to resuming. This used to be |
2060 | done in stop_stepping, however, setting prev_pc there did not handle | |
2061 | scenarios such as inferior function calls or returning from | |
2062 | a function via the return command. In those cases, the prev_pc | |
2063 | value was not set properly for subsequent commands. The prev_pc value | |
2064 | is used to initialize the starting line number in the ecs. With an | |
2065 | invalid value, the gdb next command ends up stopping at the position | |
2066 | represented by the next line table entry past our start position. | |
2067 | On platforms that generate one line table entry per line, this | |
2068 | is not a problem. However, on the ia64, the compiler generates | |
2069 | extraneous line table entries that do not increase the line number. | |
2070 | When we issue the gdb next command on the ia64 after an inferior call | |
2071 | or a return command, we often end up a few instructions forward, still | |
2072 | within the original line we started. | |
2073 | ||
d5cd6034 JB |
2074 | An attempt was made to refresh the prev_pc at the same time the |
2075 | execution_control_state is initialized (for instance, just before | |
2076 | waiting for an inferior event). But this approach did not work | |
2077 | because of platforms that use ptrace, where the pc register cannot | |
2078 | be read unless the inferior is stopped. At that point, we are not | |
2079 | guaranteed the inferior is stopped and so the regcache_read_pc() call | |
2080 | can fail. Setting the prev_pc value here ensures the value is updated | |
2081 | correctly when the inferior is stopped. */ | |
4e1c45ea | 2082 | tp->prev_pc = regcache_read_pc (get_current_regcache ()); |
e4846b08 | 2083 | |
59f0d5d9 | 2084 | /* Fill in with reasonable starting values. */ |
4e1c45ea | 2085 | init_thread_stepping_state (tp); |
59f0d5d9 | 2086 | |
59f0d5d9 PA |
2087 | /* Reset to normal state. */ |
2088 | init_infwait_state (); | |
2089 | ||
c906108c | 2090 | /* Resume inferior. */ |
2020b7ab | 2091 | resume (oneproc || step || bpstat_should_step (), tp->stop_signal); |
c906108c SS |
2092 | |
2093 | /* Wait for it to stop (if not standalone) | |
2094 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
2095 | /* Do this only if we are not using the event loop, or if the target |
2096 | does not support asynchronous execution. */ | |
362646f5 | 2097 | if (!target_can_async_p ()) |
43ff13b4 | 2098 | { |
ae123ec6 | 2099 | wait_for_inferior (0); |
43ff13b4 JM |
2100 | normal_stop (); |
2101 | } | |
c906108c | 2102 | } |
c906108c SS |
2103 | \f |
2104 | ||
2105 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 2106 | |
c906108c | 2107 | void |
8621d6a9 | 2108 | start_remote (int from_tty) |
c906108c | 2109 | { |
d6b48e9c | 2110 | struct inferior *inferior; |
d6b48e9c | 2111 | |
abbb1732 | 2112 | init_wait_for_inferior (); |
d6b48e9c PA |
2113 | inferior = current_inferior (); |
2114 | inferior->stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 2115 | |
6426a772 JM |
2116 | /* Always go on waiting for the target, regardless of the mode. */ |
2117 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 2118 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
2119 | nothing is returned (instead of just blocking). Because of this, |
2120 | targets expecting an immediate response need to, internally, set | |
2121 | things up so that the target_wait() is forced to eventually | |
2122 | timeout. */ | |
2123 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
2124 | differentiate to its caller what the state of the target is after | |
2125 | the initial open has been performed. Here we're assuming that | |
2126 | the target has stopped. It should be possible to eventually have | |
2127 | target_open() return to the caller an indication that the target | |
2128 | is currently running and GDB state should be set to the same as | |
2129 | for an async run. */ | |
ae123ec6 | 2130 | wait_for_inferior (0); |
8621d6a9 DJ |
2131 | |
2132 | /* Now that the inferior has stopped, do any bookkeeping like | |
2133 | loading shared libraries. We want to do this before normal_stop, | |
2134 | so that the displayed frame is up to date. */ | |
2135 | post_create_inferior (¤t_target, from_tty); | |
2136 | ||
6426a772 | 2137 | normal_stop (); |
c906108c SS |
2138 | } |
2139 | ||
2140 | /* Initialize static vars when a new inferior begins. */ | |
2141 | ||
2142 | void | |
96baa820 | 2143 | init_wait_for_inferior (void) |
c906108c SS |
2144 | { |
2145 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 2146 | |
c906108c SS |
2147 | breakpoint_init_inferior (inf_starting); |
2148 | ||
c906108c | 2149 | clear_proceed_status (); |
9f976b41 DJ |
2150 | |
2151 | stepping_past_singlestep_breakpoint = 0; | |
ca67fcb8 | 2152 | deferred_step_ptid = null_ptid; |
ca005067 DJ |
2153 | |
2154 | target_last_wait_ptid = minus_one_ptid; | |
237fc4c9 | 2155 | |
0d1e5fa7 PA |
2156 | previous_inferior_ptid = null_ptid; |
2157 | init_infwait_state (); | |
2158 | ||
edb3359d DJ |
2159 | /* Discard any skipped inlined frames. */ |
2160 | clear_inline_frame_state (minus_one_ptid); | |
c906108c | 2161 | } |
237fc4c9 | 2162 | |
c906108c | 2163 | \f |
b83266a0 SS |
2164 | /* This enum encodes possible reasons for doing a target_wait, so that |
2165 | wfi can call target_wait in one place. (Ultimately the call will be | |
2166 | moved out of the infinite loop entirely.) */ | |
2167 | ||
c5aa993b JM |
2168 | enum infwait_states |
2169 | { | |
cd0fc7c3 SS |
2170 | infwait_normal_state, |
2171 | infwait_thread_hop_state, | |
d983da9c | 2172 | infwait_step_watch_state, |
cd0fc7c3 | 2173 | infwait_nonstep_watch_state |
b83266a0 SS |
2174 | }; |
2175 | ||
0d1e5fa7 PA |
2176 | /* The PTID we'll do a target_wait on.*/ |
2177 | ptid_t waiton_ptid; | |
2178 | ||
2179 | /* Current inferior wait state. */ | |
2180 | enum infwait_states infwait_state; | |
cd0fc7c3 | 2181 | |
0d1e5fa7 PA |
2182 | /* Data to be passed around while handling an event. This data is |
2183 | discarded between events. */ | |
c5aa993b | 2184 | struct execution_control_state |
488f131b | 2185 | { |
0d1e5fa7 | 2186 | ptid_t ptid; |
4e1c45ea PA |
2187 | /* The thread that got the event, if this was a thread event; NULL |
2188 | otherwise. */ | |
2189 | struct thread_info *event_thread; | |
2190 | ||
488f131b | 2191 | struct target_waitstatus ws; |
488f131b JB |
2192 | int random_signal; |
2193 | CORE_ADDR stop_func_start; | |
2194 | CORE_ADDR stop_func_end; | |
2195 | char *stop_func_name; | |
488f131b | 2196 | int new_thread_event; |
488f131b JB |
2197 | int wait_some_more; |
2198 | }; | |
2199 | ||
ec9499be | 2200 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 2201 | |
568d6575 UW |
2202 | static void handle_step_into_function (struct gdbarch *gdbarch, |
2203 | struct execution_control_state *ecs); | |
2204 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
2205 | struct execution_control_state *ecs); | |
44cbf7b5 | 2206 | static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame); |
14e60db5 | 2207 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); |
a6d9a66e UW |
2208 | static void insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
2209 | struct symtab_and_line sr_sal, | |
44cbf7b5 | 2210 | struct frame_id sr_id); |
a6d9a66e | 2211 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
611c83ae | 2212 | |
104c1213 JM |
2213 | static void stop_stepping (struct execution_control_state *ecs); |
2214 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 2215 | static void keep_going (struct execution_control_state *ecs); |
104c1213 | 2216 | |
252fbfc8 PA |
2217 | /* Callback for iterate over threads. If the thread is stopped, but |
2218 | the user/frontend doesn't know about that yet, go through | |
2219 | normal_stop, as if the thread had just stopped now. ARG points at | |
2220 | a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If | |
2221 | ptid_is_pid(PTID) is true, applies to all threads of the process | |
2222 | pointed at by PTID. Otherwise, apply only to the thread pointed by | |
2223 | PTID. */ | |
2224 | ||
2225 | static int | |
2226 | infrun_thread_stop_requested_callback (struct thread_info *info, void *arg) | |
2227 | { | |
2228 | ptid_t ptid = * (ptid_t *) arg; | |
2229 | ||
2230 | if ((ptid_equal (info->ptid, ptid) | |
2231 | || ptid_equal (minus_one_ptid, ptid) | |
2232 | || (ptid_is_pid (ptid) | |
2233 | && ptid_get_pid (ptid) == ptid_get_pid (info->ptid))) | |
2234 | && is_running (info->ptid) | |
2235 | && !is_executing (info->ptid)) | |
2236 | { | |
2237 | struct cleanup *old_chain; | |
2238 | struct execution_control_state ecss; | |
2239 | struct execution_control_state *ecs = &ecss; | |
2240 | ||
2241 | memset (ecs, 0, sizeof (*ecs)); | |
2242 | ||
2243 | old_chain = make_cleanup_restore_current_thread (); | |
2244 | ||
2245 | switch_to_thread (info->ptid); | |
2246 | ||
2247 | /* Go through handle_inferior_event/normal_stop, so we always | |
2248 | have consistent output as if the stop event had been | |
2249 | reported. */ | |
2250 | ecs->ptid = info->ptid; | |
e09875d4 | 2251 | ecs->event_thread = find_thread_ptid (info->ptid); |
252fbfc8 PA |
2252 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; |
2253 | ecs->ws.value.sig = TARGET_SIGNAL_0; | |
2254 | ||
2255 | handle_inferior_event (ecs); | |
2256 | ||
2257 | if (!ecs->wait_some_more) | |
2258 | { | |
2259 | struct thread_info *tp; | |
2260 | ||
2261 | normal_stop (); | |
2262 | ||
2263 | /* Finish off the continuations. The continations | |
2264 | themselves are responsible for realising the thread | |
2265 | didn't finish what it was supposed to do. */ | |
2266 | tp = inferior_thread (); | |
2267 | do_all_intermediate_continuations_thread (tp); | |
2268 | do_all_continuations_thread (tp); | |
2269 | } | |
2270 | ||
2271 | do_cleanups (old_chain); | |
2272 | } | |
2273 | ||
2274 | return 0; | |
2275 | } | |
2276 | ||
2277 | /* This function is attached as a "thread_stop_requested" observer. | |
2278 | Cleanup local state that assumed the PTID was to be resumed, and | |
2279 | report the stop to the frontend. */ | |
2280 | ||
2c0b251b | 2281 | static void |
252fbfc8 PA |
2282 | infrun_thread_stop_requested (ptid_t ptid) |
2283 | { | |
fc1cf338 | 2284 | struct displaced_step_inferior_state *displaced; |
252fbfc8 PA |
2285 | |
2286 | /* PTID was requested to stop. Remove it from the displaced | |
2287 | stepping queue, so we don't try to resume it automatically. */ | |
fc1cf338 PA |
2288 | |
2289 | for (displaced = displaced_step_inferior_states; | |
2290 | displaced; | |
2291 | displaced = displaced->next) | |
252fbfc8 | 2292 | { |
fc1cf338 | 2293 | struct displaced_step_request *it, **prev_next_p; |
252fbfc8 | 2294 | |
fc1cf338 PA |
2295 | it = displaced->step_request_queue; |
2296 | prev_next_p = &displaced->step_request_queue; | |
2297 | while (it) | |
252fbfc8 | 2298 | { |
fc1cf338 PA |
2299 | if (ptid_match (it->ptid, ptid)) |
2300 | { | |
2301 | *prev_next_p = it->next; | |
2302 | it->next = NULL; | |
2303 | xfree (it); | |
2304 | } | |
252fbfc8 | 2305 | else |
fc1cf338 PA |
2306 | { |
2307 | prev_next_p = &it->next; | |
2308 | } | |
252fbfc8 | 2309 | |
fc1cf338 | 2310 | it = *prev_next_p; |
252fbfc8 | 2311 | } |
252fbfc8 PA |
2312 | } |
2313 | ||
2314 | iterate_over_threads (infrun_thread_stop_requested_callback, &ptid); | |
2315 | } | |
2316 | ||
a07daef3 PA |
2317 | static void |
2318 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
2319 | { | |
2320 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
2321 | nullify_last_target_wait_ptid (); | |
2322 | } | |
2323 | ||
4e1c45ea PA |
2324 | /* Callback for iterate_over_threads. */ |
2325 | ||
2326 | static int | |
2327 | delete_step_resume_breakpoint_callback (struct thread_info *info, void *data) | |
2328 | { | |
2329 | if (is_exited (info->ptid)) | |
2330 | return 0; | |
2331 | ||
2332 | delete_step_resume_breakpoint (info); | |
2333 | return 0; | |
2334 | } | |
2335 | ||
2336 | /* In all-stop, delete the step resume breakpoint of any thread that | |
2337 | had one. In non-stop, delete the step resume breakpoint of the | |
2338 | thread that just stopped. */ | |
2339 | ||
2340 | static void | |
2341 | delete_step_thread_step_resume_breakpoint (void) | |
2342 | { | |
2343 | if (!target_has_execution | |
2344 | || ptid_equal (inferior_ptid, null_ptid)) | |
2345 | /* If the inferior has exited, we have already deleted the step | |
2346 | resume breakpoints out of GDB's lists. */ | |
2347 | return; | |
2348 | ||
2349 | if (non_stop) | |
2350 | { | |
2351 | /* If in non-stop mode, only delete the step-resume or | |
2352 | longjmp-resume breakpoint of the thread that just stopped | |
2353 | stepping. */ | |
2354 | struct thread_info *tp = inferior_thread (); | |
abbb1732 | 2355 | |
4e1c45ea PA |
2356 | delete_step_resume_breakpoint (tp); |
2357 | } | |
2358 | else | |
2359 | /* In all-stop mode, delete all step-resume and longjmp-resume | |
2360 | breakpoints of any thread that had them. */ | |
2361 | iterate_over_threads (delete_step_resume_breakpoint_callback, NULL); | |
2362 | } | |
2363 | ||
2364 | /* A cleanup wrapper. */ | |
2365 | ||
2366 | static void | |
2367 | delete_step_thread_step_resume_breakpoint_cleanup (void *arg) | |
2368 | { | |
2369 | delete_step_thread_step_resume_breakpoint (); | |
2370 | } | |
2371 | ||
223698f8 DE |
2372 | /* Pretty print the results of target_wait, for debugging purposes. */ |
2373 | ||
2374 | static void | |
2375 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, | |
2376 | const struct target_waitstatus *ws) | |
2377 | { | |
2378 | char *status_string = target_waitstatus_to_string (ws); | |
2379 | struct ui_file *tmp_stream = mem_fileopen (); | |
2380 | char *text; | |
223698f8 DE |
2381 | |
2382 | /* The text is split over several lines because it was getting too long. | |
2383 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
2384 | output as a unit; we want only one timestamp printed if debug_timestamp | |
2385 | is set. */ | |
2386 | ||
2387 | fprintf_unfiltered (tmp_stream, | |
2388 | "infrun: target_wait (%d", PIDGET (waiton_ptid)); | |
2389 | if (PIDGET (waiton_ptid) != -1) | |
2390 | fprintf_unfiltered (tmp_stream, | |
2391 | " [%s]", target_pid_to_str (waiton_ptid)); | |
2392 | fprintf_unfiltered (tmp_stream, ", status) =\n"); | |
2393 | fprintf_unfiltered (tmp_stream, | |
2394 | "infrun: %d [%s],\n", | |
2395 | PIDGET (result_ptid), target_pid_to_str (result_ptid)); | |
2396 | fprintf_unfiltered (tmp_stream, | |
2397 | "infrun: %s\n", | |
2398 | status_string); | |
2399 | ||
759ef836 | 2400 | text = ui_file_xstrdup (tmp_stream, NULL); |
223698f8 DE |
2401 | |
2402 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
2403 | a gcc error: the format attribute requires a string literal. */ | |
2404 | fprintf_unfiltered (gdb_stdlog, "%s", text); | |
2405 | ||
2406 | xfree (status_string); | |
2407 | xfree (text); | |
2408 | ui_file_delete (tmp_stream); | |
2409 | } | |
2410 | ||
24291992 PA |
2411 | /* Prepare and stabilize the inferior for detaching it. E.g., |
2412 | detaching while a thread is displaced stepping is a recipe for | |
2413 | crashing it, as nothing would readjust the PC out of the scratch | |
2414 | pad. */ | |
2415 | ||
2416 | void | |
2417 | prepare_for_detach (void) | |
2418 | { | |
2419 | struct inferior *inf = current_inferior (); | |
2420 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
2421 | struct cleanup *old_chain_1; | |
2422 | struct displaced_step_inferior_state *displaced; | |
2423 | ||
2424 | displaced = get_displaced_stepping_state (inf->pid); | |
2425 | ||
2426 | /* Is any thread of this process displaced stepping? If not, | |
2427 | there's nothing else to do. */ | |
2428 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
2429 | return; | |
2430 | ||
2431 | if (debug_infrun) | |
2432 | fprintf_unfiltered (gdb_stdlog, | |
2433 | "displaced-stepping in-process while detaching"); | |
2434 | ||
2435 | old_chain_1 = make_cleanup_restore_integer (&inf->detaching); | |
2436 | inf->detaching = 1; | |
2437 | ||
2438 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
2439 | { | |
2440 | struct cleanup *old_chain_2; | |
2441 | struct execution_control_state ecss; | |
2442 | struct execution_control_state *ecs; | |
2443 | ||
2444 | ecs = &ecss; | |
2445 | memset (ecs, 0, sizeof (*ecs)); | |
2446 | ||
2447 | overlay_cache_invalid = 1; | |
2448 | ||
2449 | /* We have to invalidate the registers BEFORE calling | |
2450 | target_wait because they can be loaded from the target while | |
2451 | in target_wait. This makes remote debugging a bit more | |
2452 | efficient for those targets that provide critical registers | |
2453 | as part of their normal status mechanism. */ | |
2454 | ||
2455 | registers_changed (); | |
2456 | ||
2457 | if (deprecated_target_wait_hook) | |
2458 | ecs->ptid = deprecated_target_wait_hook (pid_ptid, &ecs->ws, 0); | |
2459 | else | |
2460 | ecs->ptid = target_wait (pid_ptid, &ecs->ws, 0); | |
2461 | ||
2462 | if (debug_infrun) | |
2463 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
2464 | ||
2465 | /* If an error happens while handling the event, propagate GDB's | |
2466 | knowledge of the executing state to the frontend/user running | |
2467 | state. */ | |
2468 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2469 | ||
4d533103 PA |
2470 | /* In non-stop mode, each thread is handled individually. |
2471 | Switch early, so the global state is set correctly for this | |
2472 | thread. */ | |
2473 | if (non_stop | |
2474 | && ecs->ws.kind != TARGET_WAITKIND_EXITED | |
2475 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) | |
2476 | context_switch (ecs->ptid); | |
2477 | ||
24291992 PA |
2478 | /* Now figure out what to do with the result of the result. */ |
2479 | handle_inferior_event (ecs); | |
2480 | ||
2481 | /* No error, don't finish the state yet. */ | |
2482 | discard_cleanups (old_chain_2); | |
2483 | ||
2484 | /* Breakpoints and watchpoints are not installed on the target | |
2485 | at this point, and signals are passed directly to the | |
2486 | inferior, so this must mean the process is gone. */ | |
2487 | if (!ecs->wait_some_more) | |
2488 | { | |
2489 | discard_cleanups (old_chain_1); | |
2490 | error (_("Program exited while detaching")); | |
2491 | } | |
2492 | } | |
2493 | ||
2494 | discard_cleanups (old_chain_1); | |
2495 | } | |
2496 | ||
cd0fc7c3 | 2497 | /* Wait for control to return from inferior to debugger. |
ae123ec6 JB |
2498 | |
2499 | If TREAT_EXEC_AS_SIGTRAP is non-zero, then handle EXEC signals | |
2500 | as if they were SIGTRAP signals. This can be useful during | |
2501 | the startup sequence on some targets such as HP/UX, where | |
2502 | we receive an EXEC event instead of the expected SIGTRAP. | |
2503 | ||
cd0fc7c3 SS |
2504 | If inferior gets a signal, we may decide to start it up again |
2505 | instead of returning. That is why there is a loop in this function. | |
2506 | When this function actually returns it means the inferior | |
2507 | should be left stopped and GDB should read more commands. */ | |
2508 | ||
2509 | void | |
ae123ec6 | 2510 | wait_for_inferior (int treat_exec_as_sigtrap) |
cd0fc7c3 SS |
2511 | { |
2512 | struct cleanup *old_cleanups; | |
0d1e5fa7 | 2513 | struct execution_control_state ecss; |
cd0fc7c3 | 2514 | struct execution_control_state *ecs; |
c906108c | 2515 | |
527159b7 | 2516 | if (debug_infrun) |
ae123ec6 JB |
2517 | fprintf_unfiltered |
2518 | (gdb_stdlog, "infrun: wait_for_inferior (treat_exec_as_sigtrap=%d)\n", | |
2519 | treat_exec_as_sigtrap); | |
527159b7 | 2520 | |
4e1c45ea PA |
2521 | old_cleanups = |
2522 | make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup, NULL); | |
cd0fc7c3 | 2523 | |
cd0fc7c3 | 2524 | ecs = &ecss; |
0d1e5fa7 PA |
2525 | memset (ecs, 0, sizeof (*ecs)); |
2526 | ||
e0bb1c1c PA |
2527 | /* We'll update this if & when we switch to a new thread. */ |
2528 | previous_inferior_ptid = inferior_ptid; | |
2529 | ||
c906108c SS |
2530 | while (1) |
2531 | { | |
29f49a6a PA |
2532 | struct cleanup *old_chain; |
2533 | ||
ec9499be UW |
2534 | /* We have to invalidate the registers BEFORE calling target_wait |
2535 | because they can be loaded from the target while in target_wait. | |
2536 | This makes remote debugging a bit more efficient for those | |
2537 | targets that provide critical registers as part of their normal | |
2538 | status mechanism. */ | |
2539 | ||
2540 | overlay_cache_invalid = 1; | |
2541 | registers_changed (); | |
2542 | ||
9a4105ab | 2543 | if (deprecated_target_wait_hook) |
47608cb1 | 2544 | ecs->ptid = deprecated_target_wait_hook (waiton_ptid, &ecs->ws, 0); |
cd0fc7c3 | 2545 | else |
47608cb1 | 2546 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 2547 | |
f00150c9 | 2548 | if (debug_infrun) |
223698f8 | 2549 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 2550 | |
ae123ec6 JB |
2551 | if (treat_exec_as_sigtrap && ecs->ws.kind == TARGET_WAITKIND_EXECD) |
2552 | { | |
2553 | xfree (ecs->ws.value.execd_pathname); | |
2554 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
2555 | ecs->ws.value.sig = TARGET_SIGNAL_TRAP; | |
2556 | } | |
2557 | ||
29f49a6a PA |
2558 | /* If an error happens while handling the event, propagate GDB's |
2559 | knowledge of the executing state to the frontend/user running | |
2560 | state. */ | |
2561 | old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2562 | ||
a96d9b2e SDJ |
2563 | if (ecs->ws.kind == TARGET_WAITKIND_SYSCALL_ENTRY |
2564 | || ecs->ws.kind == TARGET_WAITKIND_SYSCALL_RETURN) | |
2565 | ecs->ws.value.syscall_number = UNKNOWN_SYSCALL; | |
2566 | ||
cd0fc7c3 SS |
2567 | /* Now figure out what to do with the result of the result. */ |
2568 | handle_inferior_event (ecs); | |
c906108c | 2569 | |
29f49a6a PA |
2570 | /* No error, don't finish the state yet. */ |
2571 | discard_cleanups (old_chain); | |
2572 | ||
cd0fc7c3 SS |
2573 | if (!ecs->wait_some_more) |
2574 | break; | |
2575 | } | |
4e1c45ea | 2576 | |
cd0fc7c3 SS |
2577 | do_cleanups (old_cleanups); |
2578 | } | |
c906108c | 2579 | |
43ff13b4 JM |
2580 | /* Asynchronous version of wait_for_inferior. It is called by the |
2581 | event loop whenever a change of state is detected on the file | |
2582 | descriptor corresponding to the target. It can be called more than | |
2583 | once to complete a single execution command. In such cases we need | |
a474d7c2 PA |
2584 | to keep the state in a global variable ECSS. If it is the last time |
2585 | that this function is called for a single execution command, then | |
2586 | report to the user that the inferior has stopped, and do the | |
2587 | necessary cleanups. */ | |
43ff13b4 JM |
2588 | |
2589 | void | |
fba45db2 | 2590 | fetch_inferior_event (void *client_data) |
43ff13b4 | 2591 | { |
0d1e5fa7 | 2592 | struct execution_control_state ecss; |
a474d7c2 | 2593 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 2594 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 2595 | struct cleanup *ts_old_chain; |
4f8d22e3 | 2596 | int was_sync = sync_execution; |
43ff13b4 | 2597 | |
0d1e5fa7 PA |
2598 | memset (ecs, 0, sizeof (*ecs)); |
2599 | ||
ec9499be UW |
2600 | /* We'll update this if & when we switch to a new thread. */ |
2601 | previous_inferior_ptid = inferior_ptid; | |
e0bb1c1c | 2602 | |
4f8d22e3 PA |
2603 | if (non_stop) |
2604 | /* In non-stop mode, the user/frontend should not notice a thread | |
2605 | switch due to internal events. Make sure we reverse to the | |
2606 | user selected thread and frame after handling the event and | |
2607 | running any breakpoint commands. */ | |
2608 | make_cleanup_restore_current_thread (); | |
2609 | ||
59f0d5d9 PA |
2610 | /* We have to invalidate the registers BEFORE calling target_wait |
2611 | because they can be loaded from the target while in target_wait. | |
2612 | This makes remote debugging a bit more efficient for those | |
2613 | targets that provide critical registers as part of their normal | |
2614 | status mechanism. */ | |
43ff13b4 | 2615 | |
ec9499be | 2616 | overlay_cache_invalid = 1; |
59f0d5d9 | 2617 | registers_changed (); |
43ff13b4 | 2618 | |
9a4105ab | 2619 | if (deprecated_target_wait_hook) |
a474d7c2 | 2620 | ecs->ptid = |
47608cb1 | 2621 | deprecated_target_wait_hook (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 2622 | else |
47608cb1 | 2623 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 2624 | |
f00150c9 | 2625 | if (debug_infrun) |
223698f8 | 2626 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 2627 | |
94cc34af PA |
2628 | if (non_stop |
2629 | && ecs->ws.kind != TARGET_WAITKIND_IGNORE | |
2630 | && ecs->ws.kind != TARGET_WAITKIND_EXITED | |
2631 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) | |
2632 | /* In non-stop mode, each thread is handled individually. Switch | |
2633 | early, so the global state is set correctly for this | |
2634 | thread. */ | |
2635 | context_switch (ecs->ptid); | |
2636 | ||
29f49a6a PA |
2637 | /* If an error happens while handling the event, propagate GDB's |
2638 | knowledge of the executing state to the frontend/user running | |
2639 | state. */ | |
2640 | if (!non_stop) | |
2641 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2642 | else | |
2643 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
2644 | ||
43ff13b4 | 2645 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 2646 | handle_inferior_event (ecs); |
43ff13b4 | 2647 | |
a474d7c2 | 2648 | if (!ecs->wait_some_more) |
43ff13b4 | 2649 | { |
d6b48e9c PA |
2650 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); |
2651 | ||
4e1c45ea | 2652 | delete_step_thread_step_resume_breakpoint (); |
f107f563 | 2653 | |
d6b48e9c PA |
2654 | /* We may not find an inferior if this was a process exit. */ |
2655 | if (inf == NULL || inf->stop_soon == NO_STOP_QUIETLY) | |
83c265ab PA |
2656 | normal_stop (); |
2657 | ||
af679fd0 PA |
2658 | if (target_has_execution |
2659 | && ecs->ws.kind != TARGET_WAITKIND_EXITED | |
2660 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
2661 | && ecs->event_thread->step_multi | |
414c69f7 | 2662 | && ecs->event_thread->stop_step) |
c2d11a7d JM |
2663 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); |
2664 | else | |
2665 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 | 2666 | } |
4f8d22e3 | 2667 | |
29f49a6a PA |
2668 | /* No error, don't finish the thread states yet. */ |
2669 | discard_cleanups (ts_old_chain); | |
2670 | ||
4f8d22e3 PA |
2671 | /* Revert thread and frame. */ |
2672 | do_cleanups (old_chain); | |
2673 | ||
2674 | /* If the inferior was in sync execution mode, and now isn't, | |
2675 | restore the prompt. */ | |
2676 | if (was_sync && !sync_execution) | |
2677 | display_gdb_prompt (0); | |
43ff13b4 JM |
2678 | } |
2679 | ||
edb3359d DJ |
2680 | /* Record the frame and location we're currently stepping through. */ |
2681 | void | |
2682 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
2683 | { | |
2684 | struct thread_info *tp = inferior_thread (); | |
2685 | ||
2686 | tp->step_frame_id = get_frame_id (frame); | |
2687 | tp->step_stack_frame_id = get_stack_frame_id (frame); | |
2688 | ||
2689 | tp->current_symtab = sal.symtab; | |
2690 | tp->current_line = sal.line; | |
2691 | } | |
2692 | ||
0d1e5fa7 PA |
2693 | /* Clear context switchable stepping state. */ |
2694 | ||
2695 | void | |
4e1c45ea | 2696 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 PA |
2697 | { |
2698 | tss->stepping_over_breakpoint = 0; | |
2699 | tss->step_after_step_resume_breakpoint = 0; | |
2700 | tss->stepping_through_solib_after_catch = 0; | |
2701 | tss->stepping_through_solib_catchpoints = NULL; | |
cd0fc7c3 SS |
2702 | } |
2703 | ||
e02bc4cc | 2704 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
2705 | target_wait()/deprecated_target_wait_hook(). The data is actually |
2706 | cached by handle_inferior_event(), which gets called immediately | |
2707 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
2708 | |
2709 | void | |
488f131b | 2710 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 2711 | { |
39f77062 | 2712 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
2713 | *status = target_last_waitstatus; |
2714 | } | |
2715 | ||
ac264b3b MS |
2716 | void |
2717 | nullify_last_target_wait_ptid (void) | |
2718 | { | |
2719 | target_last_wait_ptid = minus_one_ptid; | |
2720 | } | |
2721 | ||
dcf4fbde | 2722 | /* Switch thread contexts. */ |
dd80620e MS |
2723 | |
2724 | static void | |
0d1e5fa7 | 2725 | context_switch (ptid_t ptid) |
dd80620e | 2726 | { |
fd48f117 DJ |
2727 | if (debug_infrun) |
2728 | { | |
2729 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
2730 | target_pid_to_str (inferior_ptid)); | |
2731 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 2732 | target_pid_to_str (ptid)); |
fd48f117 DJ |
2733 | } |
2734 | ||
0d1e5fa7 | 2735 | switch_to_thread (ptid); |
dd80620e MS |
2736 | } |
2737 | ||
4fa8626c DJ |
2738 | static void |
2739 | adjust_pc_after_break (struct execution_control_state *ecs) | |
2740 | { | |
24a73cce UW |
2741 | struct regcache *regcache; |
2742 | struct gdbarch *gdbarch; | |
6c95b8df | 2743 | struct address_space *aspace; |
8aad930b | 2744 | CORE_ADDR breakpoint_pc; |
4fa8626c | 2745 | |
4fa8626c DJ |
2746 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
2747 | we aren't, just return. | |
9709f61c DJ |
2748 | |
2749 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
2750 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
2751 | implemented by software breakpoints should be handled through the normal | |
2752 | breakpoint layer. | |
8fb3e588 | 2753 | |
4fa8626c DJ |
2754 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
2755 | different signals (SIGILL or SIGEMT for instance), but it is less | |
2756 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
2757 | gdbarch_decr_pc_after_break. I don't know any specific target that |
2758 | generates these signals at breakpoints (the code has been in GDB since at | |
2759 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 2760 | |
e6cf7916 UW |
2761 | In earlier versions of GDB, a target with |
2762 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
2763 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
2764 | target with both of these set in GDB history, and it seems unlikely to be | |
2765 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c DJ |
2766 | |
2767 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
2768 | return; | |
2769 | ||
2770 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
2771 | return; | |
2772 | ||
4058b839 PA |
2773 | /* In reverse execution, when a breakpoint is hit, the instruction |
2774 | under it has already been de-executed. The reported PC always | |
2775 | points at the breakpoint address, so adjusting it further would | |
2776 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
2777 | architecture: | |
2778 | ||
2779 | B1 0x08000000 : INSN1 | |
2780 | B2 0x08000001 : INSN2 | |
2781 | 0x08000002 : INSN3 | |
2782 | PC -> 0x08000003 : INSN4 | |
2783 | ||
2784 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
2785 | from that point should hit B2 as below. Reading the PC when the | |
2786 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
2787 | been de-executed already. | |
2788 | ||
2789 | B1 0x08000000 : INSN1 | |
2790 | B2 PC -> 0x08000001 : INSN2 | |
2791 | 0x08000002 : INSN3 | |
2792 | 0x08000003 : INSN4 | |
2793 | ||
2794 | We can't apply the same logic as for forward execution, because | |
2795 | we would wrongly adjust the PC to 0x08000000, since there's a | |
2796 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
2797 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
2798 | behaviour. */ | |
2799 | if (execution_direction == EXEC_REVERSE) | |
2800 | return; | |
2801 | ||
24a73cce UW |
2802 | /* If this target does not decrement the PC after breakpoints, then |
2803 | we have nothing to do. */ | |
2804 | regcache = get_thread_regcache (ecs->ptid); | |
2805 | gdbarch = get_regcache_arch (regcache); | |
2806 | if (gdbarch_decr_pc_after_break (gdbarch) == 0) | |
2807 | return; | |
2808 | ||
6c95b8df PA |
2809 | aspace = get_regcache_aspace (regcache); |
2810 | ||
8aad930b AC |
2811 | /* Find the location where (if we've hit a breakpoint) the |
2812 | breakpoint would be. */ | |
515630c5 UW |
2813 | breakpoint_pc = regcache_read_pc (regcache) |
2814 | - gdbarch_decr_pc_after_break (gdbarch); | |
8aad930b | 2815 | |
1c5cfe86 PA |
2816 | /* Check whether there actually is a software breakpoint inserted at |
2817 | that location. | |
2818 | ||
2819 | If in non-stop mode, a race condition is possible where we've | |
2820 | removed a breakpoint, but stop events for that breakpoint were | |
2821 | already queued and arrive later. To suppress those spurious | |
2822 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
2823 | and retire them after a number of stop events are reported. */ | |
6c95b8df PA |
2824 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
2825 | || (non_stop && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 2826 | { |
96429cc8 | 2827 | struct cleanup *old_cleanups = NULL; |
abbb1732 | 2828 | |
96429cc8 HZ |
2829 | if (RECORD_IS_USED) |
2830 | old_cleanups = record_gdb_operation_disable_set (); | |
2831 | ||
1c0fdd0e UW |
2832 | /* When using hardware single-step, a SIGTRAP is reported for both |
2833 | a completed single-step and a software breakpoint. Need to | |
2834 | differentiate between the two, as the latter needs adjusting | |
2835 | but the former does not. | |
2836 | ||
2837 | The SIGTRAP can be due to a completed hardware single-step only if | |
2838 | - we didn't insert software single-step breakpoints | |
2839 | - the thread to be examined is still the current thread | |
2840 | - this thread is currently being stepped | |
2841 | ||
2842 | If any of these events did not occur, we must have stopped due | |
2843 | to hitting a software breakpoint, and have to back up to the | |
2844 | breakpoint address. | |
2845 | ||
2846 | As a special case, we could have hardware single-stepped a | |
2847 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
2848 | we also need to back up to the breakpoint address. */ | |
2849 | ||
2850 | if (singlestep_breakpoints_inserted_p | |
2851 | || !ptid_equal (ecs->ptid, inferior_ptid) | |
4e1c45ea PA |
2852 | || !currently_stepping (ecs->event_thread) |
2853 | || ecs->event_thread->prev_pc == breakpoint_pc) | |
515630c5 | 2854 | regcache_write_pc (regcache, breakpoint_pc); |
96429cc8 HZ |
2855 | |
2856 | if (RECORD_IS_USED) | |
2857 | do_cleanups (old_cleanups); | |
8aad930b | 2858 | } |
4fa8626c DJ |
2859 | } |
2860 | ||
0d1e5fa7 PA |
2861 | void |
2862 | init_infwait_state (void) | |
2863 | { | |
2864 | waiton_ptid = pid_to_ptid (-1); | |
2865 | infwait_state = infwait_normal_state; | |
2866 | } | |
2867 | ||
94cc34af PA |
2868 | void |
2869 | error_is_running (void) | |
2870 | { | |
2871 | error (_("\ | |
2872 | Cannot execute this command while the selected thread is running.")); | |
2873 | } | |
2874 | ||
2875 | void | |
2876 | ensure_not_running (void) | |
2877 | { | |
2878 | if (is_running (inferior_ptid)) | |
2879 | error_is_running (); | |
2880 | } | |
2881 | ||
edb3359d DJ |
2882 | static int |
2883 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
2884 | { | |
2885 | for (frame = get_prev_frame (frame); | |
2886 | frame != NULL; | |
2887 | frame = get_prev_frame (frame)) | |
2888 | { | |
2889 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
2890 | return 1; | |
2891 | if (get_frame_type (frame) != INLINE_FRAME) | |
2892 | break; | |
2893 | } | |
2894 | ||
2895 | return 0; | |
2896 | } | |
2897 | ||
a96d9b2e SDJ |
2898 | /* Auxiliary function that handles syscall entry/return events. |
2899 | It returns 1 if the inferior should keep going (and GDB | |
2900 | should ignore the event), or 0 if the event deserves to be | |
2901 | processed. */ | |
ca2163eb | 2902 | |
a96d9b2e | 2903 | static int |
ca2163eb | 2904 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 2905 | { |
ca2163eb PA |
2906 | struct regcache *regcache; |
2907 | struct gdbarch *gdbarch; | |
2908 | int syscall_number; | |
2909 | ||
2910 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
2911 | context_switch (ecs->ptid); | |
2912 | ||
2913 | regcache = get_thread_regcache (ecs->ptid); | |
2914 | gdbarch = get_regcache_arch (regcache); | |
2915 | syscall_number = gdbarch_get_syscall_number (gdbarch, ecs->ptid); | |
2916 | stop_pc = regcache_read_pc (regcache); | |
2917 | ||
a96d9b2e SDJ |
2918 | target_last_waitstatus.value.syscall_number = syscall_number; |
2919 | ||
2920 | if (catch_syscall_enabled () > 0 | |
2921 | && catching_syscall_number (syscall_number) > 0) | |
2922 | { | |
2923 | if (debug_infrun) | |
2924 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
2925 | syscall_number); | |
a96d9b2e | 2926 | |
6c95b8df PA |
2927 | ecs->event_thread->stop_bpstat |
2928 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
2929 | stop_pc, ecs->ptid); | |
a96d9b2e SDJ |
2930 | ecs->random_signal = !bpstat_explains_signal (ecs->event_thread->stop_bpstat); |
2931 | ||
ca2163eb PA |
2932 | if (!ecs->random_signal) |
2933 | { | |
2934 | /* Catchpoint hit. */ | |
2935 | ecs->event_thread->stop_signal = TARGET_SIGNAL_TRAP; | |
2936 | return 0; | |
2937 | } | |
a96d9b2e | 2938 | } |
ca2163eb PA |
2939 | |
2940 | /* If no catchpoint triggered for this, then keep going. */ | |
2941 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; | |
2942 | keep_going (ecs); | |
2943 | return 1; | |
a96d9b2e SDJ |
2944 | } |
2945 | ||
cd0fc7c3 SS |
2946 | /* Given an execution control state that has been freshly filled in |
2947 | by an event from the inferior, figure out what it means and take | |
2948 | appropriate action. */ | |
c906108c | 2949 | |
ec9499be | 2950 | static void |
96baa820 | 2951 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 2952 | { |
568d6575 UW |
2953 | struct frame_info *frame; |
2954 | struct gdbarch *gdbarch; | |
c8edd8b4 | 2955 | int sw_single_step_trap_p = 0; |
d983da9c DJ |
2956 | int stopped_by_watchpoint; |
2957 | int stepped_after_stopped_by_watchpoint = 0; | |
2afb61aa | 2958 | struct symtab_and_line stop_pc_sal; |
d6b48e9c PA |
2959 | enum stop_kind stop_soon; |
2960 | ||
28736962 PA |
2961 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
2962 | { | |
2963 | /* We had an event in the inferior, but we are not interested in | |
2964 | handling it at this level. The lower layers have already | |
2965 | done what needs to be done, if anything. | |
2966 | ||
2967 | One of the possible circumstances for this is when the | |
2968 | inferior produces output for the console. The inferior has | |
2969 | not stopped, and we are ignoring the event. Another possible | |
2970 | circumstance is any event which the lower level knows will be | |
2971 | reported multiple times without an intervening resume. */ | |
2972 | if (debug_infrun) | |
2973 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
2974 | prepare_to_wait (ecs); | |
2975 | return; | |
2976 | } | |
2977 | ||
d6b48e9c | 2978 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
28736962 | 2979 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
d6b48e9c PA |
2980 | { |
2981 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); | |
abbb1732 | 2982 | |
d6b48e9c PA |
2983 | gdb_assert (inf); |
2984 | stop_soon = inf->stop_soon; | |
2985 | } | |
2986 | else | |
2987 | stop_soon = NO_STOP_QUIETLY; | |
cd0fc7c3 | 2988 | |
e02bc4cc | 2989 | /* Cache the last pid/waitstatus. */ |
39f77062 | 2990 | target_last_wait_ptid = ecs->ptid; |
0d1e5fa7 | 2991 | target_last_waitstatus = ecs->ws; |
e02bc4cc | 2992 | |
ca005067 | 2993 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 2994 | stop_stack_dummy = STOP_NONE; |
ca005067 | 2995 | |
8c90c137 LM |
2996 | /* If it's a new process, add it to the thread database */ |
2997 | ||
2998 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) | |
2999 | && !ptid_equal (ecs->ptid, minus_one_ptid) | |
3000 | && !in_thread_list (ecs->ptid)); | |
3001 | ||
3002 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
3003 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
3004 | add_thread (ecs->ptid); | |
3005 | ||
e09875d4 | 3006 | ecs->event_thread = find_thread_ptid (ecs->ptid); |
88ed393a JK |
3007 | |
3008 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
3009 | adjust_pc_after_break (ecs); | |
3010 | ||
3011 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
3012 | reinit_frame_cache (); | |
3013 | ||
28736962 PA |
3014 | breakpoint_retire_moribund (); |
3015 | ||
2b009048 DJ |
3016 | /* First, distinguish signals caused by the debugger from signals |
3017 | that have to do with the program's own actions. Note that | |
3018 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
3019 | on the operating system version. Here we detect when a SIGILL or | |
3020 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
3021 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
3022 | when we're trying to execute a breakpoint instruction on a | |
3023 | non-executable stack. This happens for call dummy breakpoints | |
3024 | for architectures like SPARC that place call dummies on the | |
3025 | stack. */ | |
2b009048 DJ |
3026 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
3027 | && (ecs->ws.value.sig == TARGET_SIGNAL_ILL | |
3028 | || ecs->ws.value.sig == TARGET_SIGNAL_SEGV | |
de0a0249 | 3029 | || ecs->ws.value.sig == TARGET_SIGNAL_EMT)) |
2b009048 | 3030 | { |
de0a0249 UW |
3031 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
3032 | ||
3033 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
3034 | regcache_read_pc (regcache))) | |
3035 | { | |
3036 | if (debug_infrun) | |
3037 | fprintf_unfiltered (gdb_stdlog, | |
3038 | "infrun: Treating signal as SIGTRAP\n"); | |
3039 | ecs->ws.value.sig = TARGET_SIGNAL_TRAP; | |
3040 | } | |
2b009048 DJ |
3041 | } |
3042 | ||
28736962 PA |
3043 | /* Mark the non-executing threads accordingly. In all-stop, all |
3044 | threads of all processes are stopped when we get any event | |
3045 | reported. In non-stop mode, only the event thread stops. If | |
3046 | we're handling a process exit in non-stop mode, there's nothing | |
3047 | to do, as threads of the dead process are gone, and threads of | |
3048 | any other process were left running. */ | |
3049 | if (!non_stop) | |
3050 | set_executing (minus_one_ptid, 0); | |
3051 | else if (ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
3052 | && ecs->ws.kind != TARGET_WAITKIND_EXITED) | |
3053 | set_executing (inferior_ptid, 0); | |
8c90c137 | 3054 | |
0d1e5fa7 | 3055 | switch (infwait_state) |
488f131b JB |
3056 | { |
3057 | case infwait_thread_hop_state: | |
527159b7 | 3058 | if (debug_infrun) |
8a9de0e4 | 3059 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); |
65e82032 | 3060 | break; |
b83266a0 | 3061 | |
488f131b | 3062 | case infwait_normal_state: |
527159b7 | 3063 | if (debug_infrun) |
8a9de0e4 | 3064 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
d983da9c DJ |
3065 | break; |
3066 | ||
3067 | case infwait_step_watch_state: | |
3068 | if (debug_infrun) | |
3069 | fprintf_unfiltered (gdb_stdlog, | |
3070 | "infrun: infwait_step_watch_state\n"); | |
3071 | ||
3072 | stepped_after_stopped_by_watchpoint = 1; | |
488f131b | 3073 | break; |
b83266a0 | 3074 | |
488f131b | 3075 | case infwait_nonstep_watch_state: |
527159b7 | 3076 | if (debug_infrun) |
8a9de0e4 AC |
3077 | fprintf_unfiltered (gdb_stdlog, |
3078 | "infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 3079 | insert_breakpoints (); |
c906108c | 3080 | |
488f131b JB |
3081 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
3082 | handle things like signals arriving and other things happening | |
3083 | in combination correctly? */ | |
3084 | stepped_after_stopped_by_watchpoint = 1; | |
3085 | break; | |
65e82032 AC |
3086 | |
3087 | default: | |
e2e0b3e5 | 3088 | internal_error (__FILE__, __LINE__, _("bad switch")); |
488f131b | 3089 | } |
ec9499be | 3090 | |
0d1e5fa7 | 3091 | infwait_state = infwait_normal_state; |
ec9499be | 3092 | waiton_ptid = pid_to_ptid (-1); |
c906108c | 3093 | |
488f131b JB |
3094 | switch (ecs->ws.kind) |
3095 | { | |
3096 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 3097 | if (debug_infrun) |
8a9de0e4 | 3098 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
b0f4b84b DJ |
3099 | /* Ignore gracefully during startup of the inferior, as it might |
3100 | be the shell which has just loaded some objects, otherwise | |
3101 | add the symbols for the newly loaded objects. Also ignore at | |
3102 | the beginning of an attach or remote session; we will query | |
3103 | the full list of libraries once the connection is | |
3104 | established. */ | |
c0236d92 | 3105 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 3106 | { |
488f131b JB |
3107 | /* Check for any newly added shared libraries if we're |
3108 | supposed to be adding them automatically. Switch | |
3109 | terminal for any messages produced by | |
3110 | breakpoint_re_set. */ | |
3111 | target_terminal_ours_for_output (); | |
aff6338a | 3112 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
3113 | stack's section table is kept up-to-date. Architectures, |
3114 | (e.g., PPC64), use the section table to perform | |
3115 | operations such as address => section name and hence | |
3116 | require the table to contain all sections (including | |
3117 | those found in shared libraries). */ | |
b0f4b84b | 3118 | #ifdef SOLIB_ADD |
aff6338a | 3119 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
b0f4b84b DJ |
3120 | #else |
3121 | solib_add (NULL, 0, ¤t_target, auto_solib_add); | |
3122 | #endif | |
488f131b JB |
3123 | target_terminal_inferior (); |
3124 | ||
b0f4b84b DJ |
3125 | /* If requested, stop when the dynamic linker notifies |
3126 | gdb of events. This allows the user to get control | |
3127 | and place breakpoints in initializer routines for | |
3128 | dynamically loaded objects (among other things). */ | |
3129 | if (stop_on_solib_events) | |
3130 | { | |
55409f9d DJ |
3131 | /* Make sure we print "Stopped due to solib-event" in |
3132 | normal_stop. */ | |
3133 | stop_print_frame = 1; | |
3134 | ||
b0f4b84b DJ |
3135 | stop_stepping (ecs); |
3136 | return; | |
3137 | } | |
3138 | ||
3139 | /* NOTE drow/2007-05-11: This might be a good place to check | |
3140 | for "catch load". */ | |
488f131b | 3141 | } |
b0f4b84b DJ |
3142 | |
3143 | /* If we are skipping through a shell, or through shared library | |
3144 | loading that we aren't interested in, resume the program. If | |
3145 | we're running the program normally, also resume. But stop if | |
3146 | we're attaching or setting up a remote connection. */ | |
3147 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
3148 | { | |
74960c60 VP |
3149 | /* Loading of shared libraries might have changed breakpoint |
3150 | addresses. Make sure new breakpoints are inserted. */ | |
0b02b92d UW |
3151 | if (stop_soon == NO_STOP_QUIETLY |
3152 | && !breakpoints_always_inserted_mode ()) | |
74960c60 | 3153 | insert_breakpoints (); |
b0f4b84b DJ |
3154 | resume (0, TARGET_SIGNAL_0); |
3155 | prepare_to_wait (ecs); | |
3156 | return; | |
3157 | } | |
3158 | ||
3159 | break; | |
c5aa993b | 3160 | |
488f131b | 3161 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 3162 | if (debug_infrun) |
8a9de0e4 | 3163 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
488f131b JB |
3164 | resume (0, TARGET_SIGNAL_0); |
3165 | prepare_to_wait (ecs); | |
3166 | return; | |
c5aa993b | 3167 | |
488f131b | 3168 | case TARGET_WAITKIND_EXITED: |
527159b7 | 3169 | if (debug_infrun) |
8a9de0e4 | 3170 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n"); |
fb66883a | 3171 | inferior_ptid = ecs->ptid; |
6c95b8df PA |
3172 | set_current_inferior (find_inferior_pid (ptid_get_pid (ecs->ptid))); |
3173 | set_current_program_space (current_inferior ()->pspace); | |
3174 | handle_vfork_child_exec_or_exit (0); | |
488f131b | 3175 | target_terminal_ours (); /* Must do this before mourn anyway */ |
33d62d64 | 3176 | print_exited_reason (ecs->ws.value.integer); |
488f131b JB |
3177 | |
3178 | /* Record the exit code in the convenience variable $_exitcode, so | |
3179 | that the user can inspect this again later. */ | |
4fa62494 UW |
3180 | set_internalvar_integer (lookup_internalvar ("_exitcode"), |
3181 | (LONGEST) ecs->ws.value.integer); | |
488f131b JB |
3182 | gdb_flush (gdb_stdout); |
3183 | target_mourn_inferior (); | |
1c0fdd0e | 3184 | singlestep_breakpoints_inserted_p = 0; |
d03285ec | 3185 | cancel_single_step_breakpoints (); |
488f131b JB |
3186 | stop_print_frame = 0; |
3187 | stop_stepping (ecs); | |
3188 | return; | |
c5aa993b | 3189 | |
488f131b | 3190 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 3191 | if (debug_infrun) |
8a9de0e4 | 3192 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n"); |
fb66883a | 3193 | inferior_ptid = ecs->ptid; |
6c95b8df PA |
3194 | set_current_inferior (find_inferior_pid (ptid_get_pid (ecs->ptid))); |
3195 | set_current_program_space (current_inferior ()->pspace); | |
3196 | handle_vfork_child_exec_or_exit (0); | |
488f131b | 3197 | stop_print_frame = 0; |
488f131b | 3198 | target_terminal_ours (); /* Must do this before mourn anyway */ |
c5aa993b | 3199 | |
488f131b JB |
3200 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
3201 | reach here unless the inferior is dead. However, for years | |
3202 | target_kill() was called here, which hints that fatal signals aren't | |
3203 | really fatal on some systems. If that's true, then some changes | |
3204 | may be needed. */ | |
3205 | target_mourn_inferior (); | |
c906108c | 3206 | |
33d62d64 | 3207 | print_signal_exited_reason (ecs->ws.value.sig); |
1c0fdd0e | 3208 | singlestep_breakpoints_inserted_p = 0; |
d03285ec | 3209 | cancel_single_step_breakpoints (); |
488f131b JB |
3210 | stop_stepping (ecs); |
3211 | return; | |
c906108c | 3212 | |
488f131b JB |
3213 | /* The following are the only cases in which we keep going; |
3214 | the above cases end in a continue or goto. */ | |
3215 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 3216 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 3217 | if (debug_infrun) |
8a9de0e4 | 3218 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); |
c906108c | 3219 | |
5a2901d9 DJ |
3220 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3221 | { | |
0d1e5fa7 | 3222 | context_switch (ecs->ptid); |
35f196d9 | 3223 | reinit_frame_cache (); |
5a2901d9 DJ |
3224 | } |
3225 | ||
b242c3c2 PA |
3226 | /* Immediately detach breakpoints from the child before there's |
3227 | any chance of letting the user delete breakpoints from the | |
3228 | breakpoint lists. If we don't do this early, it's easy to | |
3229 | leave left over traps in the child, vis: "break foo; catch | |
3230 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
3231 | the fork on the last `continue', and by that time the | |
3232 | breakpoint at "foo" is long gone from the breakpoint table. | |
3233 | If we vforked, then we don't need to unpatch here, since both | |
3234 | parent and child are sharing the same memory pages; we'll | |
3235 | need to unpatch at follow/detach time instead to be certain | |
3236 | that new breakpoints added between catchpoint hit time and | |
3237 | vfork follow are detached. */ | |
3238 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
3239 | { | |
3240 | int child_pid = ptid_get_pid (ecs->ws.value.related_pid); | |
3241 | ||
3242 | /* This won't actually modify the breakpoint list, but will | |
3243 | physically remove the breakpoints from the child. */ | |
3244 | detach_breakpoints (child_pid); | |
3245 | } | |
3246 | ||
d03285ec UW |
3247 | if (singlestep_breakpoints_inserted_p) |
3248 | { | |
3249 | /* Pull the single step breakpoints out of the target. */ | |
3250 | remove_single_step_breakpoints (); | |
3251 | singlestep_breakpoints_inserted_p = 0; | |
3252 | } | |
3253 | ||
e58b0e63 PA |
3254 | /* In case the event is caught by a catchpoint, remember that |
3255 | the event is to be followed at the next resume of the thread, | |
3256 | and not immediately. */ | |
3257 | ecs->event_thread->pending_follow = ecs->ws; | |
3258 | ||
fb14de7b | 3259 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 3260 | |
6c95b8df PA |
3261 | ecs->event_thread->stop_bpstat |
3262 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
3263 | stop_pc, ecs->ptid); | |
675bf4cb | 3264 | |
67822962 PA |
3265 | /* Note that we're interested in knowing the bpstat actually |
3266 | causes a stop, not just if it may explain the signal. | |
3267 | Software watchpoints, for example, always appear in the | |
3268 | bpstat. */ | |
3269 | ecs->random_signal = !bpstat_causes_stop (ecs->event_thread->stop_bpstat); | |
04e68871 DJ |
3270 | |
3271 | /* If no catchpoint triggered for this, then keep going. */ | |
3272 | if (ecs->random_signal) | |
3273 | { | |
6c95b8df PA |
3274 | ptid_t parent; |
3275 | ptid_t child; | |
e58b0e63 | 3276 | int should_resume; |
6c95b8df | 3277 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 3278 | |
2020b7ab | 3279 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; |
e58b0e63 PA |
3280 | |
3281 | should_resume = follow_fork (); | |
3282 | ||
6c95b8df PA |
3283 | parent = ecs->ptid; |
3284 | child = ecs->ws.value.related_pid; | |
3285 | ||
3286 | /* In non-stop mode, also resume the other branch. */ | |
3287 | if (non_stop && !detach_fork) | |
3288 | { | |
3289 | if (follow_child) | |
3290 | switch_to_thread (parent); | |
3291 | else | |
3292 | switch_to_thread (child); | |
3293 | ||
3294 | ecs->event_thread = inferior_thread (); | |
3295 | ecs->ptid = inferior_ptid; | |
3296 | keep_going (ecs); | |
3297 | } | |
3298 | ||
3299 | if (follow_child) | |
3300 | switch_to_thread (child); | |
3301 | else | |
3302 | switch_to_thread (parent); | |
3303 | ||
e58b0e63 PA |
3304 | ecs->event_thread = inferior_thread (); |
3305 | ecs->ptid = inferior_ptid; | |
3306 | ||
3307 | if (should_resume) | |
3308 | keep_going (ecs); | |
3309 | else | |
3310 | stop_stepping (ecs); | |
04e68871 DJ |
3311 | return; |
3312 | } | |
2020b7ab | 3313 | ecs->event_thread->stop_signal = TARGET_SIGNAL_TRAP; |
488f131b JB |
3314 | goto process_event_stop_test; |
3315 | ||
6c95b8df PA |
3316 | case TARGET_WAITKIND_VFORK_DONE: |
3317 | /* Done with the shared memory region. Re-insert breakpoints in | |
3318 | the parent, and keep going. */ | |
3319 | ||
3320 | if (debug_infrun) | |
3321 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
3322 | ||
3323 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3324 | context_switch (ecs->ptid); | |
3325 | ||
3326 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 3327 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
6c95b8df PA |
3328 | /* This also takes care of reinserting breakpoints in the |
3329 | previously locked inferior. */ | |
3330 | keep_going (ecs); | |
3331 | return; | |
3332 | ||
488f131b | 3333 | case TARGET_WAITKIND_EXECD: |
527159b7 | 3334 | if (debug_infrun) |
fc5261f2 | 3335 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 3336 | |
5a2901d9 DJ |
3337 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3338 | { | |
0d1e5fa7 | 3339 | context_switch (ecs->ptid); |
35f196d9 | 3340 | reinit_frame_cache (); |
5a2901d9 DJ |
3341 | } |
3342 | ||
d03285ec UW |
3343 | singlestep_breakpoints_inserted_p = 0; |
3344 | cancel_single_step_breakpoints (); | |
3345 | ||
fb14de7b | 3346 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
795e548f | 3347 | |
6c95b8df PA |
3348 | /* Do whatever is necessary to the parent branch of the vfork. */ |
3349 | handle_vfork_child_exec_or_exit (1); | |
3350 | ||
795e548f PA |
3351 | /* This causes the eventpoints and symbol table to be reset. |
3352 | Must do this now, before trying to determine whether to | |
3353 | stop. */ | |
71b43ef8 | 3354 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 3355 | |
6c95b8df PA |
3356 | ecs->event_thread->stop_bpstat |
3357 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
3358 | stop_pc, ecs->ptid); | |
795e548f PA |
3359 | ecs->random_signal = !bpstat_explains_signal (ecs->event_thread->stop_bpstat); |
3360 | ||
71b43ef8 PA |
3361 | /* Note that this may be referenced from inside |
3362 | bpstat_stop_status above, through inferior_has_execd. */ | |
3363 | xfree (ecs->ws.value.execd_pathname); | |
3364 | ecs->ws.value.execd_pathname = NULL; | |
3365 | ||
04e68871 DJ |
3366 | /* If no catchpoint triggered for this, then keep going. */ |
3367 | if (ecs->random_signal) | |
3368 | { | |
2020b7ab | 3369 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; |
04e68871 DJ |
3370 | keep_going (ecs); |
3371 | return; | |
3372 | } | |
2020b7ab | 3373 | ecs->event_thread->stop_signal = TARGET_SIGNAL_TRAP; |
488f131b JB |
3374 | goto process_event_stop_test; |
3375 | ||
b4dc5ffa MK |
3376 | /* Be careful not to try to gather much state about a thread |
3377 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 3378 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 3379 | if (debug_infrun) |
8a9de0e4 | 3380 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); |
a96d9b2e | 3381 | /* Getting the current syscall number */ |
ca2163eb | 3382 | if (handle_syscall_event (ecs) != 0) |
a96d9b2e SDJ |
3383 | return; |
3384 | goto process_event_stop_test; | |
c906108c | 3385 | |
488f131b JB |
3386 | /* Before examining the threads further, step this thread to |
3387 | get it entirely out of the syscall. (We get notice of the | |
3388 | event when the thread is just on the verge of exiting a | |
3389 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 3390 | into user code.) */ |
488f131b | 3391 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 3392 | if (debug_infrun) |
8a9de0e4 | 3393 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); |
ca2163eb | 3394 | if (handle_syscall_event (ecs) != 0) |
a96d9b2e SDJ |
3395 | return; |
3396 | goto process_event_stop_test; | |
c906108c | 3397 | |
488f131b | 3398 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 3399 | if (debug_infrun) |
8a9de0e4 | 3400 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
2020b7ab | 3401 | ecs->event_thread->stop_signal = ecs->ws.value.sig; |
488f131b | 3402 | break; |
c906108c | 3403 | |
b2175913 MS |
3404 | case TARGET_WAITKIND_NO_HISTORY: |
3405 | /* Reverse execution: target ran out of history info. */ | |
fb14de7b | 3406 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
33d62d64 | 3407 | print_no_history_reason (); |
b2175913 MS |
3408 | stop_stepping (ecs); |
3409 | return; | |
488f131b | 3410 | } |
c906108c | 3411 | |
488f131b JB |
3412 | if (ecs->new_thread_event) |
3413 | { | |
94cc34af PA |
3414 | if (non_stop) |
3415 | /* Non-stop assumes that the target handles adding new threads | |
3416 | to the thread list. */ | |
3417 | internal_error (__FILE__, __LINE__, "\ | |
3418 | targets should add new threads to the thread list themselves in non-stop mode."); | |
3419 | ||
3420 | /* We may want to consider not doing a resume here in order to | |
3421 | give the user a chance to play with the new thread. It might | |
3422 | be good to make that a user-settable option. */ | |
3423 | ||
3424 | /* At this point, all threads are stopped (happens automatically | |
3425 | in either the OS or the native code). Therefore we need to | |
3426 | continue all threads in order to make progress. */ | |
3427 | ||
173853dc PA |
3428 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3429 | context_switch (ecs->ptid); | |
488f131b JB |
3430 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); |
3431 | prepare_to_wait (ecs); | |
3432 | return; | |
3433 | } | |
c906108c | 3434 | |
2020b7ab | 3435 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED) |
252fbfc8 PA |
3436 | { |
3437 | /* Do we need to clean up the state of a thread that has | |
3438 | completed a displaced single-step? (Doing so usually affects | |
3439 | the PC, so do it here, before we set stop_pc.) */ | |
3440 | displaced_step_fixup (ecs->ptid, ecs->event_thread->stop_signal); | |
3441 | ||
3442 | /* If we either finished a single-step or hit a breakpoint, but | |
3443 | the user wanted this thread to be stopped, pretend we got a | |
3444 | SIG0 (generic unsignaled stop). */ | |
3445 | ||
3446 | if (ecs->event_thread->stop_requested | |
3447 | && ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP) | |
3448 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; | |
3449 | } | |
237fc4c9 | 3450 | |
515630c5 | 3451 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 3452 | |
527159b7 | 3453 | if (debug_infrun) |
237fc4c9 | 3454 | { |
5af949e3 UW |
3455 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
3456 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7f82dfc7 JK |
3457 | struct cleanup *old_chain = save_inferior_ptid (); |
3458 | ||
3459 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
3460 | |
3461 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
3462 | paddress (gdbarch, stop_pc)); | |
d92524f1 | 3463 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
3464 | { |
3465 | CORE_ADDR addr; | |
abbb1732 | 3466 | |
237fc4c9 PA |
3467 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
3468 | ||
3469 | if (target_stopped_data_address (¤t_target, &addr)) | |
3470 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
3471 | "infrun: stopped data address = %s\n", |
3472 | paddress (gdbarch, addr)); | |
237fc4c9 PA |
3473 | else |
3474 | fprintf_unfiltered (gdb_stdlog, | |
3475 | "infrun: (no data address available)\n"); | |
3476 | } | |
7f82dfc7 JK |
3477 | |
3478 | do_cleanups (old_chain); | |
237fc4c9 | 3479 | } |
527159b7 | 3480 | |
9f976b41 DJ |
3481 | if (stepping_past_singlestep_breakpoint) |
3482 | { | |
1c0fdd0e | 3483 | gdb_assert (singlestep_breakpoints_inserted_p); |
9f976b41 DJ |
3484 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
3485 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
3486 | ||
3487 | stepping_past_singlestep_breakpoint = 0; | |
3488 | ||
3489 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
3490 | breakpoint, or stopped for some other reason. It would be nice if |
3491 | we could tell, but we can't reliably. */ | |
2020b7ab | 3492 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP) |
8fb3e588 | 3493 | { |
527159b7 | 3494 | if (debug_infrun) |
8a9de0e4 | 3495 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n"); |
9f976b41 | 3496 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 3497 | remove_single_step_breakpoints (); |
9f976b41 DJ |
3498 | singlestep_breakpoints_inserted_p = 0; |
3499 | ||
3500 | ecs->random_signal = 0; | |
79626f8a | 3501 | ecs->event_thread->trap_expected = 0; |
9f976b41 | 3502 | |
0d1e5fa7 | 3503 | context_switch (saved_singlestep_ptid); |
9a4105ab AC |
3504 | if (deprecated_context_hook) |
3505 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
3506 | |
3507 | resume (1, TARGET_SIGNAL_0); | |
3508 | prepare_to_wait (ecs); | |
3509 | return; | |
3510 | } | |
3511 | } | |
3512 | ||
ca67fcb8 | 3513 | if (!ptid_equal (deferred_step_ptid, null_ptid)) |
6a6b96b9 | 3514 | { |
94cc34af PA |
3515 | /* In non-stop mode, there's never a deferred_step_ptid set. */ |
3516 | gdb_assert (!non_stop); | |
3517 | ||
6a6b96b9 UW |
3518 | /* If we stopped for some other reason than single-stepping, ignore |
3519 | the fact that we were supposed to switch back. */ | |
2020b7ab | 3520 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP) |
6a6b96b9 UW |
3521 | { |
3522 | if (debug_infrun) | |
3523 | fprintf_unfiltered (gdb_stdlog, | |
ca67fcb8 | 3524 | "infrun: handling deferred step\n"); |
6a6b96b9 UW |
3525 | |
3526 | /* Pull the single step breakpoints out of the target. */ | |
3527 | if (singlestep_breakpoints_inserted_p) | |
3528 | { | |
3529 | remove_single_step_breakpoints (); | |
3530 | singlestep_breakpoints_inserted_p = 0; | |
3531 | } | |
3532 | ||
3533 | /* Note: We do not call context_switch at this point, as the | |
3534 | context is already set up for stepping the original thread. */ | |
ca67fcb8 VP |
3535 | switch_to_thread (deferred_step_ptid); |
3536 | deferred_step_ptid = null_ptid; | |
6a6b96b9 UW |
3537 | /* Suppress spurious "Switching to ..." message. */ |
3538 | previous_inferior_ptid = inferior_ptid; | |
3539 | ||
3540 | resume (1, TARGET_SIGNAL_0); | |
3541 | prepare_to_wait (ecs); | |
3542 | return; | |
3543 | } | |
ca67fcb8 VP |
3544 | |
3545 | deferred_step_ptid = null_ptid; | |
6a6b96b9 UW |
3546 | } |
3547 | ||
488f131b JB |
3548 | /* See if a thread hit a thread-specific breakpoint that was meant for |
3549 | another thread. If so, then step that thread past the breakpoint, | |
3550 | and continue it. */ | |
3551 | ||
2020b7ab | 3552 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP) |
488f131b | 3553 | { |
9f976b41 | 3554 | int thread_hop_needed = 0; |
cf00dfa7 VP |
3555 | struct address_space *aspace = |
3556 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
9f976b41 | 3557 | |
f8d40ec8 JB |
3558 | /* Check if a regular breakpoint has been hit before checking |
3559 | for a potential single step breakpoint. Otherwise, GDB will | |
3560 | not see this breakpoint hit when stepping onto breakpoints. */ | |
6c95b8df | 3561 | if (regular_breakpoint_inserted_here_p (aspace, stop_pc)) |
488f131b | 3562 | { |
c5aa993b | 3563 | ecs->random_signal = 0; |
6c95b8df | 3564 | if (!breakpoint_thread_match (aspace, stop_pc, ecs->ptid)) |
9f976b41 DJ |
3565 | thread_hop_needed = 1; |
3566 | } | |
1c0fdd0e | 3567 | else if (singlestep_breakpoints_inserted_p) |
9f976b41 | 3568 | { |
fd48f117 DJ |
3569 | /* We have not context switched yet, so this should be true |
3570 | no matter which thread hit the singlestep breakpoint. */ | |
3571 | gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid)); | |
3572 | if (debug_infrun) | |
3573 | fprintf_unfiltered (gdb_stdlog, "infrun: software single step " | |
3574 | "trap for %s\n", | |
3575 | target_pid_to_str (ecs->ptid)); | |
3576 | ||
9f976b41 DJ |
3577 | ecs->random_signal = 0; |
3578 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
3579 | change when we go from single-threaded to multi-threaded. If | |
3580 | the singlestep_ptid is still in the list, assume that it is | |
3581 | really different from ecs->ptid. */ | |
3582 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
3583 | && in_thread_list (singlestep_ptid)) | |
3584 | { | |
fd48f117 DJ |
3585 | /* If the PC of the thread we were trying to single-step |
3586 | has changed, discard this event (which we were going | |
3587 | to ignore anyway), and pretend we saw that thread | |
3588 | trap. This prevents us continuously moving the | |
3589 | single-step breakpoint forward, one instruction at a | |
3590 | time. If the PC has changed, then the thread we were | |
3591 | trying to single-step has trapped or been signalled, | |
3592 | but the event has not been reported to GDB yet. | |
3593 | ||
3594 | There might be some cases where this loses signal | |
3595 | information, if a signal has arrived at exactly the | |
3596 | same time that the PC changed, but this is the best | |
3597 | we can do with the information available. Perhaps we | |
3598 | should arrange to report all events for all threads | |
3599 | when they stop, or to re-poll the remote looking for | |
3600 | this particular thread (i.e. temporarily enable | |
3601 | schedlock). */ | |
515630c5 UW |
3602 | |
3603 | CORE_ADDR new_singlestep_pc | |
3604 | = regcache_read_pc (get_thread_regcache (singlestep_ptid)); | |
3605 | ||
3606 | if (new_singlestep_pc != singlestep_pc) | |
fd48f117 | 3607 | { |
2020b7ab PA |
3608 | enum target_signal stop_signal; |
3609 | ||
fd48f117 DJ |
3610 | if (debug_infrun) |
3611 | fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread," | |
3612 | " but expected thread advanced also\n"); | |
3613 | ||
3614 | /* The current context still belongs to | |
3615 | singlestep_ptid. Don't swap here, since that's | |
3616 | the context we want to use. Just fudge our | |
3617 | state and continue. */ | |
2020b7ab PA |
3618 | stop_signal = ecs->event_thread->stop_signal; |
3619 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; | |
fd48f117 | 3620 | ecs->ptid = singlestep_ptid; |
e09875d4 | 3621 | ecs->event_thread = find_thread_ptid (ecs->ptid); |
2020b7ab | 3622 | ecs->event_thread->stop_signal = stop_signal; |
515630c5 | 3623 | stop_pc = new_singlestep_pc; |
fd48f117 DJ |
3624 | } |
3625 | else | |
3626 | { | |
3627 | if (debug_infrun) | |
3628 | fprintf_unfiltered (gdb_stdlog, | |
3629 | "infrun: unexpected thread\n"); | |
3630 | ||
3631 | thread_hop_needed = 1; | |
3632 | stepping_past_singlestep_breakpoint = 1; | |
3633 | saved_singlestep_ptid = singlestep_ptid; | |
3634 | } | |
9f976b41 DJ |
3635 | } |
3636 | } | |
3637 | ||
3638 | if (thread_hop_needed) | |
8fb3e588 | 3639 | { |
9f5a595d | 3640 | struct regcache *thread_regcache; |
237fc4c9 | 3641 | int remove_status = 0; |
8fb3e588 | 3642 | |
527159b7 | 3643 | if (debug_infrun) |
8a9de0e4 | 3644 | fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); |
527159b7 | 3645 | |
b3444185 PA |
3646 | /* Switch context before touching inferior memory, the |
3647 | previous thread may have exited. */ | |
3648 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
3649 | context_switch (ecs->ptid); | |
3650 | ||
8fb3e588 AC |
3651 | /* Saw a breakpoint, but it was hit by the wrong thread. |
3652 | Just continue. */ | |
3653 | ||
1c0fdd0e | 3654 | if (singlestep_breakpoints_inserted_p) |
488f131b | 3655 | { |
8fb3e588 | 3656 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 3657 | remove_single_step_breakpoints (); |
8fb3e588 AC |
3658 | singlestep_breakpoints_inserted_p = 0; |
3659 | } | |
3660 | ||
237fc4c9 PA |
3661 | /* If the arch can displace step, don't remove the |
3662 | breakpoints. */ | |
9f5a595d UW |
3663 | thread_regcache = get_thread_regcache (ecs->ptid); |
3664 | if (!use_displaced_stepping (get_regcache_arch (thread_regcache))) | |
237fc4c9 PA |
3665 | remove_status = remove_breakpoints (); |
3666 | ||
8fb3e588 AC |
3667 | /* Did we fail to remove breakpoints? If so, try |
3668 | to set the PC past the bp. (There's at least | |
3669 | one situation in which we can fail to remove | |
3670 | the bp's: On HP-UX's that use ttrace, we can't | |
3671 | change the address space of a vforking child | |
3672 | process until the child exits (well, okay, not | |
3673 | then either :-) or execs. */ | |
3674 | if (remove_status != 0) | |
9d9cd7ac | 3675 | error (_("Cannot step over breakpoint hit in wrong thread")); |
8fb3e588 AC |
3676 | else |
3677 | { /* Single step */ | |
94cc34af PA |
3678 | if (!non_stop) |
3679 | { | |
3680 | /* Only need to require the next event from this | |
3681 | thread in all-stop mode. */ | |
3682 | waiton_ptid = ecs->ptid; | |
3683 | infwait_state = infwait_thread_hop_state; | |
3684 | } | |
8fb3e588 | 3685 | |
4e1c45ea | 3686 | ecs->event_thread->stepping_over_breakpoint = 1; |
8fb3e588 | 3687 | keep_going (ecs); |
8fb3e588 AC |
3688 | return; |
3689 | } | |
488f131b | 3690 | } |
1c0fdd0e | 3691 | else if (singlestep_breakpoints_inserted_p) |
8fb3e588 AC |
3692 | { |
3693 | sw_single_step_trap_p = 1; | |
3694 | ecs->random_signal = 0; | |
3695 | } | |
488f131b JB |
3696 | } |
3697 | else | |
3698 | ecs->random_signal = 1; | |
c906108c | 3699 | |
488f131b | 3700 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
3701 | so, then switch to that thread. */ |
3702 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 3703 | { |
527159b7 | 3704 | if (debug_infrun) |
8a9de0e4 | 3705 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 3706 | |
0d1e5fa7 | 3707 | context_switch (ecs->ptid); |
c5aa993b | 3708 | |
9a4105ab AC |
3709 | if (deprecated_context_hook) |
3710 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 3711 | } |
c906108c | 3712 | |
568d6575 UW |
3713 | /* At this point, get hold of the now-current thread's frame. */ |
3714 | frame = get_current_frame (); | |
3715 | gdbarch = get_frame_arch (frame); | |
3716 | ||
1c0fdd0e | 3717 | if (singlestep_breakpoints_inserted_p) |
488f131b JB |
3718 | { |
3719 | /* Pull the single step breakpoints out of the target. */ | |
e0cd558a | 3720 | remove_single_step_breakpoints (); |
488f131b JB |
3721 | singlestep_breakpoints_inserted_p = 0; |
3722 | } | |
c906108c | 3723 | |
d983da9c DJ |
3724 | if (stepped_after_stopped_by_watchpoint) |
3725 | stopped_by_watchpoint = 0; | |
3726 | else | |
3727 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
3728 | ||
3729 | /* If necessary, step over this watchpoint. We'll be back to display | |
3730 | it in a moment. */ | |
3731 | if (stopped_by_watchpoint | |
d92524f1 | 3732 | && (target_have_steppable_watchpoint |
568d6575 | 3733 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 3734 | { |
488f131b JB |
3735 | /* At this point, we are stopped at an instruction which has |
3736 | attempted to write to a piece of memory under control of | |
3737 | a watchpoint. The instruction hasn't actually executed | |
3738 | yet. If we were to evaluate the watchpoint expression | |
3739 | now, we would get the old value, and therefore no change | |
3740 | would seem to have occurred. | |
3741 | ||
3742 | In order to make watchpoints work `right', we really need | |
3743 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
3744 | watchpoint expression. We do this by single-stepping the |
3745 | target. | |
3746 | ||
3747 | It may not be necessary to disable the watchpoint to stop over | |
3748 | it. For example, the PA can (with some kernel cooperation) | |
3749 | single step over a watchpoint without disabling the watchpoint. | |
3750 | ||
3751 | It is far more common to need to disable a watchpoint to step | |
3752 | the inferior over it. If we have non-steppable watchpoints, | |
3753 | we must disable the current watchpoint; it's simplest to | |
3754 | disable all watchpoints and breakpoints. */ | |
2facfe5c DD |
3755 | int hw_step = 1; |
3756 | ||
d92524f1 | 3757 | if (!target_have_steppable_watchpoint) |
d983da9c | 3758 | remove_breakpoints (); |
2facfe5c | 3759 | /* Single step */ |
568d6575 | 3760 | hw_step = maybe_software_singlestep (gdbarch, stop_pc); |
2facfe5c | 3761 | target_resume (ecs->ptid, hw_step, TARGET_SIGNAL_0); |
0d1e5fa7 | 3762 | waiton_ptid = ecs->ptid; |
d92524f1 | 3763 | if (target_have_steppable_watchpoint) |
0d1e5fa7 | 3764 | infwait_state = infwait_step_watch_state; |
d983da9c | 3765 | else |
0d1e5fa7 | 3766 | infwait_state = infwait_nonstep_watch_state; |
488f131b JB |
3767 | prepare_to_wait (ecs); |
3768 | return; | |
3769 | } | |
3770 | ||
488f131b JB |
3771 | ecs->stop_func_start = 0; |
3772 | ecs->stop_func_end = 0; | |
3773 | ecs->stop_func_name = 0; | |
3774 | /* Don't care about return value; stop_func_start and stop_func_name | |
3775 | will both be 0 if it doesn't work. */ | |
3776 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
3777 | &ecs->stop_func_start, &ecs->stop_func_end); | |
cbf3b44a | 3778 | ecs->stop_func_start |
568d6575 | 3779 | += gdbarch_deprecated_function_start_offset (gdbarch); |
4e1c45ea | 3780 | ecs->event_thread->stepping_over_breakpoint = 0; |
347bddb7 | 3781 | bpstat_clear (&ecs->event_thread->stop_bpstat); |
414c69f7 | 3782 | ecs->event_thread->stop_step = 0; |
488f131b JB |
3783 | stop_print_frame = 1; |
3784 | ecs->random_signal = 0; | |
3785 | stopped_by_random_signal = 0; | |
488f131b | 3786 | |
edb3359d DJ |
3787 | /* Hide inlined functions starting here, unless we just performed stepi or |
3788 | nexti. After stepi and nexti, always show the innermost frame (not any | |
3789 | inline function call sites). */ | |
3790 | if (ecs->event_thread->step_range_end != 1) | |
3791 | skip_inline_frames (ecs->ptid); | |
3792 | ||
2020b7ab | 3793 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP |
4e1c45ea | 3794 | && ecs->event_thread->trap_expected |
568d6575 | 3795 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 3796 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 3797 | { |
b50d7442 | 3798 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 AC |
3799 | also on an instruction that needs to be stepped multiple |
3800 | times before it's been fully executing. E.g., architectures | |
3801 | with a delay slot. It needs to be stepped twice, once for | |
3802 | the instruction and once for the delay slot. */ | |
3803 | int step_through_delay | |
568d6575 | 3804 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 3805 | |
527159b7 | 3806 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 3807 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
4e1c45ea | 3808 | if (ecs->event_thread->step_range_end == 0 && step_through_delay) |
3352ef37 AC |
3809 | { |
3810 | /* The user issued a continue when stopped at a breakpoint. | |
3811 | Set up for another trap and get out of here. */ | |
4e1c45ea | 3812 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
3813 | keep_going (ecs); |
3814 | return; | |
3815 | } | |
3816 | else if (step_through_delay) | |
3817 | { | |
3818 | /* The user issued a step when stopped at a breakpoint. | |
3819 | Maybe we should stop, maybe we should not - the delay | |
3820 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
3821 | case, don't decide that here, just set |
3822 | ecs->stepping_over_breakpoint, making sure we | |
3823 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 3824 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
3825 | } |
3826 | } | |
3827 | ||
488f131b JB |
3828 | /* Look at the cause of the stop, and decide what to do. |
3829 | The alternatives are: | |
0d1e5fa7 PA |
3830 | 1) stop_stepping and return; to really stop and return to the debugger, |
3831 | 2) keep_going and return to start up again | |
4e1c45ea | 3832 | (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once) |
488f131b JB |
3833 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 |
3834 | will be made according to the signal handling tables. */ | |
3835 | ||
2020b7ab | 3836 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP |
b0f4b84b DJ |
3837 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP |
3838 | || stop_soon == STOP_QUIETLY_REMOTE) | |
488f131b | 3839 | { |
2020b7ab | 3840 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) |
488f131b | 3841 | { |
527159b7 | 3842 | if (debug_infrun) |
8a9de0e4 | 3843 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); |
488f131b JB |
3844 | stop_print_frame = 0; |
3845 | stop_stepping (ecs); | |
3846 | return; | |
3847 | } | |
c54cfec8 EZ |
3848 | |
3849 | /* This is originated from start_remote(), start_inferior() and | |
3850 | shared libraries hook functions. */ | |
b0f4b84b | 3851 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
488f131b | 3852 | { |
527159b7 | 3853 | if (debug_infrun) |
8a9de0e4 | 3854 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); |
488f131b JB |
3855 | stop_stepping (ecs); |
3856 | return; | |
3857 | } | |
3858 | ||
c54cfec8 | 3859 | /* This originates from attach_command(). We need to overwrite |
a0d21d28 PA |
3860 | the stop_signal here, because some kernels don't ignore a |
3861 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
3862 | See more comments in inferior.h. On the other hand, if we | |
a0ef4274 | 3863 | get a non-SIGSTOP, report it to the user - assume the backend |
a0d21d28 PA |
3864 | will handle the SIGSTOP if it should show up later. |
3865 | ||
3866 | Also consider that the attach is complete when we see a | |
3867 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
3868 | target extended-remote report it instead of a SIGSTOP | |
3869 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
e0ba6746 PA |
3870 | signal, so this is no exception. |
3871 | ||
3872 | Also consider that the attach is complete when we see a | |
3873 | TARGET_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
3874 | the target to stop all threads of the inferior, in case the | |
3875 | low level attach operation doesn't stop them implicitly. If | |
3876 | they weren't stopped implicitly, then the stub will report a | |
3877 | TARGET_SIGNAL_0, meaning: stopped for no particular reason | |
3878 | other than GDB's request. */ | |
a0ef4274 | 3879 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP |
2020b7ab | 3880 | && (ecs->event_thread->stop_signal == TARGET_SIGNAL_STOP |
e0ba6746 PA |
3881 | || ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP |
3882 | || ecs->event_thread->stop_signal == TARGET_SIGNAL_0)) | |
c54cfec8 EZ |
3883 | { |
3884 | stop_stepping (ecs); | |
2020b7ab | 3885 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; |
c54cfec8 EZ |
3886 | return; |
3887 | } | |
3888 | ||
fba57f8f | 3889 | /* See if there is a breakpoint at the current PC. */ |
6c95b8df PA |
3890 | ecs->event_thread->stop_bpstat |
3891 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
3892 | stop_pc, ecs->ptid); | |
3893 | ||
fba57f8f VP |
3894 | /* Following in case break condition called a |
3895 | function. */ | |
3896 | stop_print_frame = 1; | |
488f131b | 3897 | |
db82e815 PA |
3898 | /* This is where we handle "moribund" watchpoints. Unlike |
3899 | software breakpoints traps, hardware watchpoint traps are | |
3900 | always distinguishable from random traps. If no high-level | |
3901 | watchpoint is associated with the reported stop data address | |
3902 | anymore, then the bpstat does not explain the signal --- | |
3903 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
3904 | set. */ | |
3905 | ||
3906 | if (debug_infrun | |
3907 | && ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP | |
3908 | && !bpstat_explains_signal (ecs->event_thread->stop_bpstat) | |
3909 | && stopped_by_watchpoint) | |
3910 | fprintf_unfiltered (gdb_stdlog, "\ | |
3911 | infrun: no user watchpoint explains watchpoint SIGTRAP, ignoring\n"); | |
3912 | ||
73dd234f | 3913 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
3914 | at one stage in the past included checks for an inferior |
3915 | function call's call dummy's return breakpoint. The original | |
3916 | comment, that went with the test, read: | |
73dd234f | 3917 | |
8fb3e588 AC |
3918 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
3919 | another signal besides SIGTRAP, so check here as well as | |
3920 | above.'' | |
73dd234f | 3921 | |
8002d778 | 3922 | If someone ever tries to get call dummys on a |
73dd234f | 3923 | non-executable stack to work (where the target would stop |
03cebad2 MK |
3924 | with something like a SIGSEGV), then those tests might need |
3925 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 3926 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
3927 | suspect that it won't be the case. |
3928 | ||
8fb3e588 AC |
3929 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
3930 | be necessary for call dummies on a non-executable stack on | |
3931 | SPARC. */ | |
73dd234f | 3932 | |
2020b7ab | 3933 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP) |
488f131b | 3934 | ecs->random_signal |
347bddb7 | 3935 | = !(bpstat_explains_signal (ecs->event_thread->stop_bpstat) |
db82e815 | 3936 | || stopped_by_watchpoint |
4e1c45ea PA |
3937 | || ecs->event_thread->trap_expected |
3938 | || (ecs->event_thread->step_range_end | |
3939 | && ecs->event_thread->step_resume_breakpoint == NULL)); | |
488f131b JB |
3940 | else |
3941 | { | |
347bddb7 | 3942 | ecs->random_signal = !bpstat_explains_signal (ecs->event_thread->stop_bpstat); |
488f131b | 3943 | if (!ecs->random_signal) |
2020b7ab | 3944 | ecs->event_thread->stop_signal = TARGET_SIGNAL_TRAP; |
488f131b JB |
3945 | } |
3946 | } | |
3947 | ||
3948 | /* When we reach this point, we've pretty much decided | |
3949 | that the reason for stopping must've been a random | |
3950 | (unexpected) signal. */ | |
3951 | ||
3952 | else | |
3953 | ecs->random_signal = 1; | |
488f131b | 3954 | |
04e68871 | 3955 | process_event_stop_test: |
568d6575 UW |
3956 | |
3957 | /* Re-fetch current thread's frame in case we did a | |
3958 | "goto process_event_stop_test" above. */ | |
3959 | frame = get_current_frame (); | |
3960 | gdbarch = get_frame_arch (frame); | |
3961 | ||
488f131b JB |
3962 | /* For the program's own signals, act according to |
3963 | the signal handling tables. */ | |
3964 | ||
3965 | if (ecs->random_signal) | |
3966 | { | |
3967 | /* Signal not for debugging purposes. */ | |
3968 | int printed = 0; | |
24291992 | 3969 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); |
488f131b | 3970 | |
527159b7 | 3971 | if (debug_infrun) |
2020b7ab PA |
3972 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", |
3973 | ecs->event_thread->stop_signal); | |
527159b7 | 3974 | |
488f131b JB |
3975 | stopped_by_random_signal = 1; |
3976 | ||
2020b7ab | 3977 | if (signal_print[ecs->event_thread->stop_signal]) |
488f131b JB |
3978 | { |
3979 | printed = 1; | |
3980 | target_terminal_ours_for_output (); | |
33d62d64 | 3981 | print_signal_received_reason (ecs->event_thread->stop_signal); |
488f131b | 3982 | } |
252fbfc8 PA |
3983 | /* Always stop on signals if we're either just gaining control |
3984 | of the program, or the user explicitly requested this thread | |
3985 | to remain stopped. */ | |
d6b48e9c | 3986 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 3987 | || ecs->event_thread->stop_requested |
24291992 PA |
3988 | || (!inf->detaching |
3989 | && signal_stop_state (ecs->event_thread->stop_signal))) | |
488f131b JB |
3990 | { |
3991 | stop_stepping (ecs); | |
3992 | return; | |
3993 | } | |
3994 | /* If not going to stop, give terminal back | |
3995 | if we took it away. */ | |
3996 | else if (printed) | |
3997 | target_terminal_inferior (); | |
3998 | ||
3999 | /* Clear the signal if it should not be passed. */ | |
2020b7ab PA |
4000 | if (signal_program[ecs->event_thread->stop_signal] == 0) |
4001 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; | |
488f131b | 4002 | |
fb14de7b | 4003 | if (ecs->event_thread->prev_pc == stop_pc |
4e1c45ea PA |
4004 | && ecs->event_thread->trap_expected |
4005 | && ecs->event_thread->step_resume_breakpoint == NULL) | |
68f53502 AC |
4006 | { |
4007 | /* We were just starting a new sequence, attempting to | |
4008 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 4009 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
4010 | of the stepping range so GDB needs to remember to, when |
4011 | the signal handler returns, resume stepping off that | |
4012 | breakpoint. */ | |
4013 | /* To simplify things, "continue" is forced to use the same | |
4014 | code paths as single-step - set a breakpoint at the | |
4015 | signal return address and then, once hit, step off that | |
4016 | breakpoint. */ | |
237fc4c9 PA |
4017 | if (debug_infrun) |
4018 | fprintf_unfiltered (gdb_stdlog, | |
4019 | "infrun: signal arrived while stepping over " | |
4020 | "breakpoint\n"); | |
d3169d93 | 4021 | |
568d6575 | 4022 | insert_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 4023 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
9d799f85 AC |
4024 | keep_going (ecs); |
4025 | return; | |
68f53502 | 4026 | } |
9d799f85 | 4027 | |
4e1c45ea | 4028 | if (ecs->event_thread->step_range_end != 0 |
2020b7ab | 4029 | && ecs->event_thread->stop_signal != TARGET_SIGNAL_0 |
4e1c45ea PA |
4030 | && (ecs->event_thread->step_range_start <= stop_pc |
4031 | && stop_pc < ecs->event_thread->step_range_end) | |
edb3359d DJ |
4032 | && frame_id_eq (get_stack_frame_id (frame), |
4033 | ecs->event_thread->step_stack_frame_id) | |
4e1c45ea | 4034 | && ecs->event_thread->step_resume_breakpoint == NULL) |
d303a6c7 AC |
4035 | { |
4036 | /* The inferior is about to take a signal that will take it | |
4037 | out of the single step range. Set a breakpoint at the | |
4038 | current PC (which is presumably where the signal handler | |
4039 | will eventually return) and then allow the inferior to | |
4040 | run free. | |
4041 | ||
4042 | Note that this is only needed for a signal delivered | |
4043 | while in the single-step range. Nested signals aren't a | |
4044 | problem as they eventually all return. */ | |
237fc4c9 PA |
4045 | if (debug_infrun) |
4046 | fprintf_unfiltered (gdb_stdlog, | |
4047 | "infrun: signal may take us out of " | |
4048 | "single-step range\n"); | |
4049 | ||
568d6575 | 4050 | insert_step_resume_breakpoint_at_frame (frame); |
9d799f85 AC |
4051 | keep_going (ecs); |
4052 | return; | |
d303a6c7 | 4053 | } |
9d799f85 AC |
4054 | |
4055 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
4056 | when either there's a nested signal, or when there's a | |
4057 | pending signal enabled just as the signal handler returns | |
4058 | (leaving the inferior at the step-resume-breakpoint without | |
4059 | actually executing it). Either way continue until the | |
4060 | breakpoint is really hit. */ | |
488f131b JB |
4061 | keep_going (ecs); |
4062 | return; | |
4063 | } | |
4064 | ||
4065 | /* Handle cases caused by hitting a breakpoint. */ | |
4066 | { | |
4067 | CORE_ADDR jmp_buf_pc; | |
4068 | struct bpstat_what what; | |
4069 | ||
347bddb7 | 4070 | what = bpstat_what (ecs->event_thread->stop_bpstat); |
488f131b JB |
4071 | |
4072 | if (what.call_dummy) | |
4073 | { | |
aa7d318d | 4074 | stop_stack_dummy = what.call_dummy; |
c5aa993b | 4075 | } |
c906108c | 4076 | |
628fe4e4 JK |
4077 | /* If we hit an internal event that triggers symbol changes, the |
4078 | current frame will be invalidated within bpstat_what (e.g., if | |
4079 | we hit an internal solib event). Re-fetch it. */ | |
4080 | frame = get_current_frame (); | |
4081 | gdbarch = get_frame_arch (frame); | |
4082 | ||
488f131b | 4083 | switch (what.main_action) |
c5aa993b | 4084 | { |
488f131b | 4085 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
611c83ae PA |
4086 | /* If we hit the breakpoint at longjmp while stepping, we |
4087 | install a momentary breakpoint at the target of the | |
4088 | jmp_buf. */ | |
4089 | ||
4090 | if (debug_infrun) | |
4091 | fprintf_unfiltered (gdb_stdlog, | |
4092 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
4093 | ||
4e1c45ea | 4094 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 4095 | |
568d6575 UW |
4096 | if (!gdbarch_get_longjmp_target_p (gdbarch) |
4097 | || !gdbarch_get_longjmp_target (gdbarch, frame, &jmp_buf_pc)) | |
c5aa993b | 4098 | { |
611c83ae PA |
4099 | if (debug_infrun) |
4100 | fprintf_unfiltered (gdb_stdlog, "\ | |
4101 | infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n"); | |
488f131b | 4102 | keep_going (ecs); |
104c1213 | 4103 | return; |
c5aa993b | 4104 | } |
488f131b | 4105 | |
611c83ae PA |
4106 | /* We're going to replace the current step-resume breakpoint |
4107 | with a longjmp-resume breakpoint. */ | |
4e1c45ea | 4108 | delete_step_resume_breakpoint (ecs->event_thread); |
611c83ae PA |
4109 | |
4110 | /* Insert a breakpoint at resume address. */ | |
a6d9a66e | 4111 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); |
c906108c | 4112 | |
488f131b JB |
4113 | keep_going (ecs); |
4114 | return; | |
c906108c | 4115 | |
488f131b | 4116 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
527159b7 | 4117 | if (debug_infrun) |
611c83ae PA |
4118 | fprintf_unfiltered (gdb_stdlog, |
4119 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
4120 | ||
4e1c45ea PA |
4121 | gdb_assert (ecs->event_thread->step_resume_breakpoint != NULL); |
4122 | delete_step_resume_breakpoint (ecs->event_thread); | |
611c83ae | 4123 | |
414c69f7 | 4124 | ecs->event_thread->stop_step = 1; |
33d62d64 | 4125 | print_end_stepping_range_reason (); |
611c83ae PA |
4126 | stop_stepping (ecs); |
4127 | return; | |
488f131b JB |
4128 | |
4129 | case BPSTAT_WHAT_SINGLE: | |
527159b7 | 4130 | if (debug_infrun) |
8802d8ed | 4131 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); |
4e1c45ea | 4132 | ecs->event_thread->stepping_over_breakpoint = 1; |
488f131b JB |
4133 | /* Still need to check other stuff, at least the case |
4134 | where we are stepping and step out of the right range. */ | |
4135 | break; | |
c906108c | 4136 | |
488f131b | 4137 | case BPSTAT_WHAT_STOP_NOISY: |
527159b7 | 4138 | if (debug_infrun) |
8802d8ed | 4139 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); |
488f131b | 4140 | stop_print_frame = 1; |
c906108c | 4141 | |
d303a6c7 AC |
4142 | /* We are about to nuke the step_resume_breakpointt via the |
4143 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 4144 | |
488f131b JB |
4145 | stop_stepping (ecs); |
4146 | return; | |
c5aa993b | 4147 | |
488f131b | 4148 | case BPSTAT_WHAT_STOP_SILENT: |
527159b7 | 4149 | if (debug_infrun) |
8802d8ed | 4150 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); |
488f131b | 4151 | stop_print_frame = 0; |
c5aa993b | 4152 | |
d303a6c7 AC |
4153 | /* We are about to nuke the step_resume_breakpoin via the |
4154 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 4155 | |
488f131b | 4156 | stop_stepping (ecs); |
e441088d | 4157 | return; |
c5aa993b | 4158 | |
488f131b | 4159 | case BPSTAT_WHAT_STEP_RESUME: |
527159b7 | 4160 | if (debug_infrun) |
8802d8ed | 4161 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); |
527159b7 | 4162 | |
4e1c45ea PA |
4163 | delete_step_resume_breakpoint (ecs->event_thread); |
4164 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
68f53502 AC |
4165 | { |
4166 | /* Back when the step-resume breakpoint was inserted, we | |
4167 | were trying to single-step off a breakpoint. Go back | |
4168 | to doing that. */ | |
4e1c45ea PA |
4169 | ecs->event_thread->step_after_step_resume_breakpoint = 0; |
4170 | ecs->event_thread->stepping_over_breakpoint = 1; | |
68f53502 AC |
4171 | keep_going (ecs); |
4172 | return; | |
4173 | } | |
b2175913 MS |
4174 | if (stop_pc == ecs->stop_func_start |
4175 | && execution_direction == EXEC_REVERSE) | |
4176 | { | |
4177 | /* We are stepping over a function call in reverse, and | |
4178 | just hit the step-resume breakpoint at the start | |
4179 | address of the function. Go back to single-stepping, | |
4180 | which should take us back to the function call. */ | |
4181 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4182 | keep_going (ecs); | |
4183 | return; | |
4184 | } | |
488f131b JB |
4185 | break; |
4186 | ||
488f131b JB |
4187 | case BPSTAT_WHAT_KEEP_CHECKING: |
4188 | break; | |
4189 | } | |
4190 | } | |
c906108c | 4191 | |
488f131b JB |
4192 | /* We come here if we hit a breakpoint but should not |
4193 | stop for it. Possibly we also were stepping | |
4194 | and should stop for that. So fall through and | |
4195 | test for stepping. But, if not stepping, | |
4196 | do not stop. */ | |
c906108c | 4197 | |
a7212384 UW |
4198 | /* In all-stop mode, if we're currently stepping but have stopped in |
4199 | some other thread, we need to switch back to the stepped thread. */ | |
4200 | if (!non_stop) | |
4201 | { | |
4202 | struct thread_info *tp; | |
abbb1732 | 4203 | |
b3444185 | 4204 | tp = iterate_over_threads (currently_stepping_or_nexting_callback, |
a7212384 UW |
4205 | ecs->event_thread); |
4206 | if (tp) | |
4207 | { | |
4208 | /* However, if the current thread is blocked on some internal | |
4209 | breakpoint, and we simply need to step over that breakpoint | |
4210 | to get it going again, do that first. */ | |
4211 | if ((ecs->event_thread->trap_expected | |
4212 | && ecs->event_thread->stop_signal != TARGET_SIGNAL_TRAP) | |
4213 | || ecs->event_thread->stepping_over_breakpoint) | |
4214 | { | |
4215 | keep_going (ecs); | |
4216 | return; | |
4217 | } | |
4218 | ||
66852e9c PA |
4219 | /* If the stepping thread exited, then don't try to switch |
4220 | back and resume it, which could fail in several different | |
4221 | ways depending on the target. Instead, just keep going. | |
4222 | ||
4223 | We can find a stepping dead thread in the thread list in | |
4224 | two cases: | |
4225 | ||
4226 | - The target supports thread exit events, and when the | |
4227 | target tries to delete the thread from the thread list, | |
4228 | inferior_ptid pointed at the exiting thread. In such | |
4229 | case, calling delete_thread does not really remove the | |
4230 | thread from the list; instead, the thread is left listed, | |
4231 | with 'exited' state. | |
4232 | ||
4233 | - The target's debug interface does not support thread | |
4234 | exit events, and so we have no idea whatsoever if the | |
4235 | previously stepping thread is still alive. For that | |
4236 | reason, we need to synchronously query the target | |
4237 | now. */ | |
b3444185 PA |
4238 | if (is_exited (tp->ptid) |
4239 | || !target_thread_alive (tp->ptid)) | |
4240 | { | |
4241 | if (debug_infrun) | |
4242 | fprintf_unfiltered (gdb_stdlog, "\ | |
4243 | infrun: not switching back to stepped thread, it has vanished\n"); | |
4244 | ||
4245 | delete_thread (tp->ptid); | |
4246 | keep_going (ecs); | |
4247 | return; | |
4248 | } | |
4249 | ||
a7212384 UW |
4250 | /* Otherwise, we no longer expect a trap in the current thread. |
4251 | Clear the trap_expected flag before switching back -- this is | |
4252 | what keep_going would do as well, if we called it. */ | |
4253 | ecs->event_thread->trap_expected = 0; | |
4254 | ||
4255 | if (debug_infrun) | |
4256 | fprintf_unfiltered (gdb_stdlog, | |
4257 | "infrun: switching back to stepped thread\n"); | |
4258 | ||
4259 | ecs->event_thread = tp; | |
4260 | ecs->ptid = tp->ptid; | |
4261 | context_switch (ecs->ptid); | |
4262 | keep_going (ecs); | |
4263 | return; | |
4264 | } | |
4265 | } | |
4266 | ||
9d1ff73f MS |
4267 | /* Are we stepping to get the inferior out of the dynamic linker's |
4268 | hook (and possibly the dld itself) after catching a shlib | |
4269 | event? */ | |
4e1c45ea | 4270 | if (ecs->event_thread->stepping_through_solib_after_catch) |
488f131b JB |
4271 | { |
4272 | #if defined(SOLIB_ADD) | |
4273 | /* Have we reached our destination? If not, keep going. */ | |
4274 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
4275 | { | |
527159b7 | 4276 | if (debug_infrun) |
8a9de0e4 | 4277 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n"); |
4e1c45ea | 4278 | ecs->event_thread->stepping_over_breakpoint = 1; |
488f131b | 4279 | keep_going (ecs); |
104c1213 | 4280 | return; |
488f131b JB |
4281 | } |
4282 | #endif | |
527159b7 | 4283 | if (debug_infrun) |
8a9de0e4 | 4284 | fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n"); |
488f131b JB |
4285 | /* Else, stop and report the catchpoint(s) whose triggering |
4286 | caused us to begin stepping. */ | |
4e1c45ea | 4287 | ecs->event_thread->stepping_through_solib_after_catch = 0; |
347bddb7 PA |
4288 | bpstat_clear (&ecs->event_thread->stop_bpstat); |
4289 | ecs->event_thread->stop_bpstat | |
4290 | = bpstat_copy (ecs->event_thread->stepping_through_solib_catchpoints); | |
4e1c45ea | 4291 | bpstat_clear (&ecs->event_thread->stepping_through_solib_catchpoints); |
488f131b JB |
4292 | stop_print_frame = 1; |
4293 | stop_stepping (ecs); | |
4294 | return; | |
4295 | } | |
c906108c | 4296 | |
4e1c45ea | 4297 | if (ecs->event_thread->step_resume_breakpoint) |
488f131b | 4298 | { |
527159b7 | 4299 | if (debug_infrun) |
d3169d93 DJ |
4300 | fprintf_unfiltered (gdb_stdlog, |
4301 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 4302 | |
488f131b JB |
4303 | /* Having a step-resume breakpoint overrides anything |
4304 | else having to do with stepping commands until | |
4305 | that breakpoint is reached. */ | |
488f131b JB |
4306 | keep_going (ecs); |
4307 | return; | |
4308 | } | |
c5aa993b | 4309 | |
4e1c45ea | 4310 | if (ecs->event_thread->step_range_end == 0) |
488f131b | 4311 | { |
527159b7 | 4312 | if (debug_infrun) |
8a9de0e4 | 4313 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 4314 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
4315 | keep_going (ecs); |
4316 | return; | |
4317 | } | |
c5aa993b | 4318 | |
4b7703ad JB |
4319 | /* Re-fetch current thread's frame in case the code above caused |
4320 | the frame cache to be re-initialized, making our FRAME variable | |
4321 | a dangling pointer. */ | |
4322 | frame = get_current_frame (); | |
628fe4e4 | 4323 | gdbarch = get_frame_arch (frame); |
4b7703ad | 4324 | |
488f131b | 4325 | /* If stepping through a line, keep going if still within it. |
c906108c | 4326 | |
488f131b JB |
4327 | Note that step_range_end is the address of the first instruction |
4328 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
4329 | within it! |
4330 | ||
4331 | Note also that during reverse execution, we may be stepping | |
4332 | through a function epilogue and therefore must detect when | |
4333 | the current-frame changes in the middle of a line. */ | |
4334 | ||
4e1c45ea | 4335 | if (stop_pc >= ecs->event_thread->step_range_start |
31410e84 MS |
4336 | && stop_pc < ecs->event_thread->step_range_end |
4337 | && (execution_direction != EXEC_REVERSE | |
388a8562 | 4338 | || frame_id_eq (get_frame_id (frame), |
31410e84 | 4339 | ecs->event_thread->step_frame_id))) |
488f131b | 4340 | { |
527159b7 | 4341 | if (debug_infrun) |
5af949e3 UW |
4342 | fprintf_unfiltered |
4343 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
4344 | paddress (gdbarch, ecs->event_thread->step_range_start), | |
4345 | paddress (gdbarch, ecs->event_thread->step_range_end)); | |
b2175913 MS |
4346 | |
4347 | /* When stepping backward, stop at beginning of line range | |
4348 | (unless it's the function entry point, in which case | |
4349 | keep going back to the call point). */ | |
4350 | if (stop_pc == ecs->event_thread->step_range_start | |
4351 | && stop_pc != ecs->stop_func_start | |
4352 | && execution_direction == EXEC_REVERSE) | |
4353 | { | |
4354 | ecs->event_thread->stop_step = 1; | |
33d62d64 | 4355 | print_end_stepping_range_reason (); |
b2175913 MS |
4356 | stop_stepping (ecs); |
4357 | } | |
4358 | else | |
4359 | keep_going (ecs); | |
4360 | ||
488f131b JB |
4361 | return; |
4362 | } | |
c5aa993b | 4363 | |
488f131b | 4364 | /* We stepped out of the stepping range. */ |
c906108c | 4365 | |
488f131b | 4366 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
4367 | loader dynamic symbol resolution code... |
4368 | ||
4369 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
4370 | time loader code and reach the callee's address. | |
4371 | ||
4372 | EXEC_REVERSE: we've already executed the callee (backward), and | |
4373 | the runtime loader code is handled just like any other | |
4374 | undebuggable function call. Now we need only keep stepping | |
4375 | backward through the trampoline code, and that's handled further | |
4376 | down, so there is nothing for us to do here. */ | |
4377 | ||
4378 | if (execution_direction != EXEC_REVERSE | |
4379 | && ecs->event_thread->step_over_calls == STEP_OVER_UNDEBUGGABLE | |
cfd8ab24 | 4380 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 4381 | { |
4c8c40e6 | 4382 | CORE_ADDR pc_after_resolver = |
568d6575 | 4383 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); |
c906108c | 4384 | |
527159b7 | 4385 | if (debug_infrun) |
8a9de0e4 | 4386 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n"); |
527159b7 | 4387 | |
488f131b JB |
4388 | if (pc_after_resolver) |
4389 | { | |
4390 | /* Set up a step-resume breakpoint at the address | |
4391 | indicated by SKIP_SOLIB_RESOLVER. */ | |
4392 | struct symtab_and_line sr_sal; | |
abbb1732 | 4393 | |
fe39c653 | 4394 | init_sal (&sr_sal); |
488f131b | 4395 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 4396 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 4397 | |
a6d9a66e UW |
4398 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4399 | sr_sal, null_frame_id); | |
c5aa993b | 4400 | } |
c906108c | 4401 | |
488f131b JB |
4402 | keep_going (ecs); |
4403 | return; | |
4404 | } | |
c906108c | 4405 | |
4e1c45ea | 4406 | if (ecs->event_thread->step_range_end != 1 |
078130d0 PA |
4407 | && (ecs->event_thread->step_over_calls == STEP_OVER_UNDEBUGGABLE |
4408 | || ecs->event_thread->step_over_calls == STEP_OVER_ALL) | |
568d6575 | 4409 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 4410 | { |
527159b7 | 4411 | if (debug_infrun) |
8a9de0e4 | 4412 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n"); |
42edda50 | 4413 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
4414 | a signal trampoline (either by a signal being delivered or by |
4415 | the signal handler returning). Just single-step until the | |
4416 | inferior leaves the trampoline (either by calling the handler | |
4417 | or returning). */ | |
488f131b JB |
4418 | keep_going (ecs); |
4419 | return; | |
4420 | } | |
c906108c | 4421 | |
c17eaafe DJ |
4422 | /* Check for subroutine calls. The check for the current frame |
4423 | equalling the step ID is not necessary - the check of the | |
4424 | previous frame's ID is sufficient - but it is a common case and | |
4425 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
4426 | |
4427 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
4428 | being equal, so to get into this block, both the current and | |
4429 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
4430 | /* The outer_frame_id check is a heuristic to detect stepping |
4431 | through startup code. If we step over an instruction which | |
4432 | sets the stack pointer from an invalid value to a valid value, | |
4433 | we may detect that as a subroutine call from the mythical | |
4434 | "outermost" function. This could be fixed by marking | |
4435 | outermost frames as !stack_p,code_p,special_p. Then the | |
4436 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 4437 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 4438 | for more. */ |
edb3359d DJ |
4439 | if (!frame_id_eq (get_stack_frame_id (frame), |
4440 | ecs->event_thread->step_stack_frame_id) | |
005ca36a JB |
4441 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
4442 | ecs->event_thread->step_stack_frame_id) | |
4443 | && (!frame_id_eq (ecs->event_thread->step_stack_frame_id, | |
4444 | outer_frame_id) | |
4445 | || step_start_function != find_pc_function (stop_pc)))) | |
488f131b | 4446 | { |
95918acb | 4447 | CORE_ADDR real_stop_pc; |
8fb3e588 | 4448 | |
527159b7 | 4449 | if (debug_infrun) |
8a9de0e4 | 4450 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 4451 | |
078130d0 | 4452 | if ((ecs->event_thread->step_over_calls == STEP_OVER_NONE) |
4e1c45ea | 4453 | || ((ecs->event_thread->step_range_end == 1) |
d80b854b | 4454 | && in_prologue (gdbarch, ecs->event_thread->prev_pc, |
4e1c45ea | 4455 | ecs->stop_func_start))) |
95918acb AC |
4456 | { |
4457 | /* I presume that step_over_calls is only 0 when we're | |
4458 | supposed to be stepping at the assembly language level | |
4459 | ("stepi"). Just stop. */ | |
4460 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
4461 | thought it was a subroutine call but it was not. Stop as | |
4462 | well. FENN */ | |
388a8562 | 4463 | /* And this works the same backward as frontward. MVS */ |
414c69f7 | 4464 | ecs->event_thread->stop_step = 1; |
33d62d64 | 4465 | print_end_stepping_range_reason (); |
95918acb AC |
4466 | stop_stepping (ecs); |
4467 | return; | |
4468 | } | |
8fb3e588 | 4469 | |
388a8562 MS |
4470 | /* Reverse stepping through solib trampolines. */ |
4471 | ||
4472 | if (execution_direction == EXEC_REVERSE | |
fdd654f3 | 4473 | && ecs->event_thread->step_over_calls != STEP_OVER_NONE |
388a8562 MS |
4474 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
4475 | || (ecs->stop_func_start == 0 | |
4476 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
4477 | { | |
4478 | /* Any solib trampoline code can be handled in reverse | |
4479 | by simply continuing to single-step. We have already | |
4480 | executed the solib function (backwards), and a few | |
4481 | steps will take us back through the trampoline to the | |
4482 | caller. */ | |
4483 | keep_going (ecs); | |
4484 | return; | |
4485 | } | |
4486 | ||
078130d0 | 4487 | if (ecs->event_thread->step_over_calls == STEP_OVER_ALL) |
8567c30f | 4488 | { |
b2175913 MS |
4489 | /* We're doing a "next". |
4490 | ||
4491 | Normal (forward) execution: set a breakpoint at the | |
4492 | callee's return address (the address at which the caller | |
4493 | will resume). | |
4494 | ||
4495 | Reverse (backward) execution. set the step-resume | |
4496 | breakpoint at the start of the function that we just | |
4497 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 4498 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
4499 | |
4500 | if (execution_direction == EXEC_REVERSE) | |
4501 | { | |
4502 | struct symtab_and_line sr_sal; | |
3067f6e5 | 4503 | |
388a8562 MS |
4504 | /* Normal function call return (static or dynamic). */ |
4505 | init_sal (&sr_sal); | |
4506 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df PA |
4507 | sr_sal.pspace = get_frame_program_space (frame); |
4508 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
4509 | sr_sal, null_frame_id); | |
b2175913 MS |
4510 | } |
4511 | else | |
568d6575 | 4512 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 4513 | |
8567c30f AC |
4514 | keep_going (ecs); |
4515 | return; | |
4516 | } | |
a53c66de | 4517 | |
95918acb | 4518 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
4519 | calling routine and the real function), locate the real |
4520 | function. That's what tells us (a) whether we want to step | |
4521 | into it at all, and (b) what prologue we want to run to the | |
4522 | end of, if we do step into it. */ | |
568d6575 | 4523 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 4524 | if (real_stop_pc == 0) |
568d6575 | 4525 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
4526 | if (real_stop_pc != 0) |
4527 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 4528 | |
db5f024e | 4529 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 RC |
4530 | { |
4531 | struct symtab_and_line sr_sal; | |
abbb1732 | 4532 | |
1b2bfbb9 RC |
4533 | init_sal (&sr_sal); |
4534 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 4535 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 4536 | |
a6d9a66e UW |
4537 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4538 | sr_sal, null_frame_id); | |
8fb3e588 AC |
4539 | keep_going (ecs); |
4540 | return; | |
1b2bfbb9 RC |
4541 | } |
4542 | ||
95918acb | 4543 | /* If we have line number information for the function we are |
8fb3e588 | 4544 | thinking of stepping into, step into it. |
95918acb | 4545 | |
8fb3e588 AC |
4546 | If there are several symtabs at that PC (e.g. with include |
4547 | files), just want to know whether *any* of them have line | |
4548 | numbers. find_pc_line handles this. */ | |
95918acb AC |
4549 | { |
4550 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 4551 | |
95918acb | 4552 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
9d1807c3 | 4553 | tmp_sal.pspace = get_frame_program_space (frame); |
95918acb AC |
4554 | if (tmp_sal.line != 0) |
4555 | { | |
b2175913 | 4556 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 4557 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 4558 | else |
568d6575 | 4559 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
4560 | return; |
4561 | } | |
4562 | } | |
4563 | ||
4564 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
4565 | set, we stop the step so that the user has a chance to switch |
4566 | in assembly mode. */ | |
078130d0 PA |
4567 | if (ecs->event_thread->step_over_calls == STEP_OVER_UNDEBUGGABLE |
4568 | && step_stop_if_no_debug) | |
95918acb | 4569 | { |
414c69f7 | 4570 | ecs->event_thread->stop_step = 1; |
33d62d64 | 4571 | print_end_stepping_range_reason (); |
95918acb AC |
4572 | stop_stepping (ecs); |
4573 | return; | |
4574 | } | |
4575 | ||
b2175913 MS |
4576 | if (execution_direction == EXEC_REVERSE) |
4577 | { | |
4578 | /* Set a breakpoint at callee's start address. | |
4579 | From there we can step once and be back in the caller. */ | |
4580 | struct symtab_and_line sr_sal; | |
abbb1732 | 4581 | |
b2175913 MS |
4582 | init_sal (&sr_sal); |
4583 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 4584 | sr_sal.pspace = get_frame_program_space (frame); |
a6d9a66e UW |
4585 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4586 | sr_sal, null_frame_id); | |
b2175913 MS |
4587 | } |
4588 | else | |
4589 | /* Set a breakpoint at callee's return address (the address | |
4590 | at which the caller will resume). */ | |
568d6575 | 4591 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 4592 | |
95918acb | 4593 | keep_going (ecs); |
488f131b | 4594 | return; |
488f131b | 4595 | } |
c906108c | 4596 | |
fdd654f3 MS |
4597 | /* Reverse stepping through solib trampolines. */ |
4598 | ||
4599 | if (execution_direction == EXEC_REVERSE | |
4600 | && ecs->event_thread->step_over_calls != STEP_OVER_NONE) | |
4601 | { | |
4602 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
4603 | || (ecs->stop_func_start == 0 | |
4604 | && in_solib_dynsym_resolve_code (stop_pc))) | |
4605 | { | |
4606 | /* Any solib trampoline code can be handled in reverse | |
4607 | by simply continuing to single-step. We have already | |
4608 | executed the solib function (backwards), and a few | |
4609 | steps will take us back through the trampoline to the | |
4610 | caller. */ | |
4611 | keep_going (ecs); | |
4612 | return; | |
4613 | } | |
4614 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
4615 | { | |
4616 | /* Stepped backward into the solib dynsym resolver. | |
4617 | Set a breakpoint at its start and continue, then | |
4618 | one more step will take us out. */ | |
4619 | struct symtab_and_line sr_sal; | |
abbb1732 | 4620 | |
fdd654f3 MS |
4621 | init_sal (&sr_sal); |
4622 | sr_sal.pc = ecs->stop_func_start; | |
9d1807c3 | 4623 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
4624 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4625 | sr_sal, null_frame_id); | |
4626 | keep_going (ecs); | |
4627 | return; | |
4628 | } | |
4629 | } | |
4630 | ||
488f131b JB |
4631 | /* If we're in the return path from a shared library trampoline, |
4632 | we want to proceed through the trampoline when stepping. */ | |
568d6575 | 4633 | if (gdbarch_in_solib_return_trampoline (gdbarch, |
e76f05fa | 4634 | stop_pc, ecs->stop_func_name)) |
488f131b | 4635 | { |
488f131b | 4636 | /* Determine where this trampoline returns. */ |
52f729a7 | 4637 | CORE_ADDR real_stop_pc; |
abbb1732 | 4638 | |
568d6575 | 4639 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
c906108c | 4640 | |
527159b7 | 4641 | if (debug_infrun) |
8a9de0e4 | 4642 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n"); |
527159b7 | 4643 | |
488f131b | 4644 | /* Only proceed through if we know where it's going. */ |
d764a824 | 4645 | if (real_stop_pc) |
488f131b JB |
4646 | { |
4647 | /* And put the step-breakpoint there and go until there. */ | |
4648 | struct symtab_and_line sr_sal; | |
4649 | ||
fe39c653 | 4650 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 4651 | sr_sal.pc = real_stop_pc; |
488f131b | 4652 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 4653 | sr_sal.pspace = get_frame_program_space (frame); |
44cbf7b5 AC |
4654 | |
4655 | /* Do not specify what the fp should be when we stop since | |
4656 | on some machines the prologue is where the new fp value | |
4657 | is established. */ | |
a6d9a66e UW |
4658 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4659 | sr_sal, null_frame_id); | |
c906108c | 4660 | |
488f131b JB |
4661 | /* Restart without fiddling with the step ranges or |
4662 | other state. */ | |
4663 | keep_going (ecs); | |
4664 | return; | |
4665 | } | |
4666 | } | |
c906108c | 4667 | |
2afb61aa | 4668 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 4669 | |
1b2bfbb9 RC |
4670 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
4671 | the trampoline processing logic, however, there are some trampolines | |
4672 | that have no names, so we should do trampoline handling first. */ | |
078130d0 | 4673 | if (ecs->event_thread->step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 4674 | && ecs->stop_func_name == NULL |
2afb61aa | 4675 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 4676 | { |
527159b7 | 4677 | if (debug_infrun) |
8a9de0e4 | 4678 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n"); |
527159b7 | 4679 | |
1b2bfbb9 | 4680 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
4681 | undebuggable function (where there is no debugging information |
4682 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
4683 | inferior stopped). Since we want to skip this kind of code, |
4684 | we keep going until the inferior returns from this | |
14e60db5 DJ |
4685 | function - unless the user has asked us not to (via |
4686 | set step-mode) or we no longer know how to get back | |
4687 | to the call site. */ | |
4688 | if (step_stop_if_no_debug | |
c7ce8faa | 4689 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
4690 | { |
4691 | /* If we have no line number and the step-stop-if-no-debug | |
4692 | is set, we stop the step so that the user has a chance to | |
4693 | switch in assembly mode. */ | |
414c69f7 | 4694 | ecs->event_thread->stop_step = 1; |
33d62d64 | 4695 | print_end_stepping_range_reason (); |
1b2bfbb9 RC |
4696 | stop_stepping (ecs); |
4697 | return; | |
4698 | } | |
4699 | else | |
4700 | { | |
4701 | /* Set a breakpoint at callee's return address (the address | |
4702 | at which the caller will resume). */ | |
568d6575 | 4703 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
4704 | keep_going (ecs); |
4705 | return; | |
4706 | } | |
4707 | } | |
4708 | ||
4e1c45ea | 4709 | if (ecs->event_thread->step_range_end == 1) |
1b2bfbb9 RC |
4710 | { |
4711 | /* It is stepi or nexti. We always want to stop stepping after | |
4712 | one instruction. */ | |
527159b7 | 4713 | if (debug_infrun) |
8a9de0e4 | 4714 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
414c69f7 | 4715 | ecs->event_thread->stop_step = 1; |
33d62d64 | 4716 | print_end_stepping_range_reason (); |
1b2bfbb9 RC |
4717 | stop_stepping (ecs); |
4718 | return; | |
4719 | } | |
4720 | ||
2afb61aa | 4721 | if (stop_pc_sal.line == 0) |
488f131b JB |
4722 | { |
4723 | /* We have no line number information. That means to stop | |
4724 | stepping (does this always happen right after one instruction, | |
4725 | when we do "s" in a function with no line numbers, | |
4726 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 4727 | if (debug_infrun) |
8a9de0e4 | 4728 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
414c69f7 | 4729 | ecs->event_thread->stop_step = 1; |
33d62d64 | 4730 | print_end_stepping_range_reason (); |
488f131b JB |
4731 | stop_stepping (ecs); |
4732 | return; | |
4733 | } | |
c906108c | 4734 | |
edb3359d DJ |
4735 | /* Look for "calls" to inlined functions, part one. If the inline |
4736 | frame machinery detected some skipped call sites, we have entered | |
4737 | a new inline function. */ | |
4738 | ||
4739 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
4740 | ecs->event_thread->step_frame_id) | |
4741 | && inline_skipped_frames (ecs->ptid)) | |
4742 | { | |
4743 | struct symtab_and_line call_sal; | |
4744 | ||
4745 | if (debug_infrun) | |
4746 | fprintf_unfiltered (gdb_stdlog, | |
4747 | "infrun: stepped into inlined function\n"); | |
4748 | ||
4749 | find_frame_sal (get_current_frame (), &call_sal); | |
4750 | ||
4751 | if (ecs->event_thread->step_over_calls != STEP_OVER_ALL) | |
4752 | { | |
4753 | /* For "step", we're going to stop. But if the call site | |
4754 | for this inlined function is on the same source line as | |
4755 | we were previously stepping, go down into the function | |
4756 | first. Otherwise stop at the call site. */ | |
4757 | ||
4758 | if (call_sal.line == ecs->event_thread->current_line | |
4759 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4760 | step_into_inline_frame (ecs->ptid); | |
4761 | ||
4762 | ecs->event_thread->stop_step = 1; | |
33d62d64 | 4763 | print_end_stepping_range_reason (); |
edb3359d DJ |
4764 | stop_stepping (ecs); |
4765 | return; | |
4766 | } | |
4767 | else | |
4768 | { | |
4769 | /* For "next", we should stop at the call site if it is on a | |
4770 | different source line. Otherwise continue through the | |
4771 | inlined function. */ | |
4772 | if (call_sal.line == ecs->event_thread->current_line | |
4773 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4774 | keep_going (ecs); | |
4775 | else | |
4776 | { | |
4777 | ecs->event_thread->stop_step = 1; | |
33d62d64 | 4778 | print_end_stepping_range_reason (); |
edb3359d DJ |
4779 | stop_stepping (ecs); |
4780 | } | |
4781 | return; | |
4782 | } | |
4783 | } | |
4784 | ||
4785 | /* Look for "calls" to inlined functions, part two. If we are still | |
4786 | in the same real function we were stepping through, but we have | |
4787 | to go further up to find the exact frame ID, we are stepping | |
4788 | through a more inlined call beyond its call site. */ | |
4789 | ||
4790 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
4791 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
4792 | ecs->event_thread->step_frame_id) | |
4793 | && stepped_in_from (get_current_frame (), | |
4794 | ecs->event_thread->step_frame_id)) | |
4795 | { | |
4796 | if (debug_infrun) | |
4797 | fprintf_unfiltered (gdb_stdlog, | |
4798 | "infrun: stepping through inlined function\n"); | |
4799 | ||
4800 | if (ecs->event_thread->step_over_calls == STEP_OVER_ALL) | |
4801 | keep_going (ecs); | |
4802 | else | |
4803 | { | |
4804 | ecs->event_thread->stop_step = 1; | |
33d62d64 | 4805 | print_end_stepping_range_reason (); |
edb3359d DJ |
4806 | stop_stepping (ecs); |
4807 | } | |
4808 | return; | |
4809 | } | |
4810 | ||
2afb61aa | 4811 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
4812 | && (ecs->event_thread->current_line != stop_pc_sal.line |
4813 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
4814 | { |
4815 | /* We are at the start of a different line. So stop. Note that | |
4816 | we don't stop if we step into the middle of a different line. | |
4817 | That is said to make things like for (;;) statements work | |
4818 | better. */ | |
527159b7 | 4819 | if (debug_infrun) |
8a9de0e4 | 4820 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n"); |
414c69f7 | 4821 | ecs->event_thread->stop_step = 1; |
33d62d64 | 4822 | print_end_stepping_range_reason (); |
488f131b JB |
4823 | stop_stepping (ecs); |
4824 | return; | |
4825 | } | |
c906108c | 4826 | |
488f131b | 4827 | /* We aren't done stepping. |
c906108c | 4828 | |
488f131b JB |
4829 | Optimize by setting the stepping range to the line. |
4830 | (We might not be in the original line, but if we entered a | |
4831 | new line in mid-statement, we continue stepping. This makes | |
4832 | things like for(;;) statements work better.) */ | |
c906108c | 4833 | |
4e1c45ea PA |
4834 | ecs->event_thread->step_range_start = stop_pc_sal.pc; |
4835 | ecs->event_thread->step_range_end = stop_pc_sal.end; | |
edb3359d | 4836 | set_step_info (frame, stop_pc_sal); |
488f131b | 4837 | |
527159b7 | 4838 | if (debug_infrun) |
8a9de0e4 | 4839 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 4840 | keep_going (ecs); |
104c1213 JM |
4841 | } |
4842 | ||
b3444185 | 4843 | /* Is thread TP in the middle of single-stepping? */ |
104c1213 | 4844 | |
a7212384 | 4845 | static int |
b3444185 | 4846 | currently_stepping (struct thread_info *tp) |
a7212384 | 4847 | { |
b3444185 PA |
4848 | return ((tp->step_range_end && tp->step_resume_breakpoint == NULL) |
4849 | || tp->trap_expected | |
4850 | || tp->stepping_through_solib_after_catch | |
4851 | || bpstat_should_step ()); | |
a7212384 UW |
4852 | } |
4853 | ||
b3444185 PA |
4854 | /* Returns true if any thread *but* the one passed in "data" is in the |
4855 | middle of stepping or of handling a "next". */ | |
a7212384 | 4856 | |
104c1213 | 4857 | static int |
b3444185 | 4858 | currently_stepping_or_nexting_callback (struct thread_info *tp, void *data) |
104c1213 | 4859 | { |
b3444185 PA |
4860 | if (tp == data) |
4861 | return 0; | |
4862 | ||
4863 | return (tp->step_range_end | |
4864 | || tp->trap_expected | |
4865 | || tp->stepping_through_solib_after_catch); | |
104c1213 | 4866 | } |
c906108c | 4867 | |
b2175913 MS |
4868 | /* Inferior has stepped into a subroutine call with source code that |
4869 | we should not step over. Do step to the first line of code in | |
4870 | it. */ | |
c2c6d25f JM |
4871 | |
4872 | static void | |
568d6575 UW |
4873 | handle_step_into_function (struct gdbarch *gdbarch, |
4874 | struct execution_control_state *ecs) | |
c2c6d25f JM |
4875 | { |
4876 | struct symtab *s; | |
2afb61aa | 4877 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f JM |
4878 | |
4879 | s = find_pc_symtab (stop_pc); | |
4880 | if (s && s->language != language_asm) | |
568d6575 | 4881 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 | 4882 | ecs->stop_func_start); |
c2c6d25f | 4883 | |
2afb61aa | 4884 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
4885 | /* Use the step_resume_break to step until the end of the prologue, |
4886 | even if that involves jumps (as it seems to on the vax under | |
4887 | 4.2). */ | |
4888 | /* If the prologue ends in the middle of a source line, continue to | |
4889 | the end of that source line (if it is still within the function). | |
4890 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
4891 | if (stop_func_sal.end |
4892 | && stop_func_sal.pc != ecs->stop_func_start | |
4893 | && stop_func_sal.end < ecs->stop_func_end) | |
4894 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 4895 | |
2dbd5e30 KB |
4896 | /* Architectures which require breakpoint adjustment might not be able |
4897 | to place a breakpoint at the computed address. If so, the test | |
4898 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
4899 | ecs->stop_func_start to an address at which a breakpoint may be | |
4900 | legitimately placed. | |
8fb3e588 | 4901 | |
2dbd5e30 KB |
4902 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
4903 | made, GDB will enter an infinite loop when stepping through | |
4904 | optimized code consisting of VLIW instructions which contain | |
4905 | subinstructions corresponding to different source lines. On | |
4906 | FR-V, it's not permitted to place a breakpoint on any but the | |
4907 | first subinstruction of a VLIW instruction. When a breakpoint is | |
4908 | set, GDB will adjust the breakpoint address to the beginning of | |
4909 | the VLIW instruction. Thus, we need to make the corresponding | |
4910 | adjustment here when computing the stop address. */ | |
8fb3e588 | 4911 | |
568d6575 | 4912 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
4913 | { |
4914 | ecs->stop_func_start | |
568d6575 | 4915 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 4916 | ecs->stop_func_start); |
2dbd5e30 KB |
4917 | } |
4918 | ||
c2c6d25f JM |
4919 | if (ecs->stop_func_start == stop_pc) |
4920 | { | |
4921 | /* We are already there: stop now. */ | |
414c69f7 | 4922 | ecs->event_thread->stop_step = 1; |
33d62d64 | 4923 | print_end_stepping_range_reason (); |
c2c6d25f JM |
4924 | stop_stepping (ecs); |
4925 | return; | |
4926 | } | |
4927 | else | |
4928 | { | |
4929 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 4930 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
4931 | sr_sal.pc = ecs->stop_func_start; |
4932 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 4933 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 4934 | |
c2c6d25f | 4935 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
4936 | some machines the prologue is where the new fp value is |
4937 | established. */ | |
a6d9a66e | 4938 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
4939 | |
4940 | /* And make sure stepping stops right away then. */ | |
4e1c45ea | 4941 | ecs->event_thread->step_range_end = ecs->event_thread->step_range_start; |
c2c6d25f JM |
4942 | } |
4943 | keep_going (ecs); | |
4944 | } | |
d4f3574e | 4945 | |
b2175913 MS |
4946 | /* Inferior has stepped backward into a subroutine call with source |
4947 | code that we should not step over. Do step to the beginning of the | |
4948 | last line of code in it. */ | |
4949 | ||
4950 | static void | |
568d6575 UW |
4951 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
4952 | struct execution_control_state *ecs) | |
b2175913 MS |
4953 | { |
4954 | struct symtab *s; | |
167e4384 | 4955 | struct symtab_and_line stop_func_sal; |
b2175913 MS |
4956 | |
4957 | s = find_pc_symtab (stop_pc); | |
4958 | if (s && s->language != language_asm) | |
568d6575 | 4959 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 MS |
4960 | ecs->stop_func_start); |
4961 | ||
4962 | stop_func_sal = find_pc_line (stop_pc, 0); | |
4963 | ||
4964 | /* OK, we're just going to keep stepping here. */ | |
4965 | if (stop_func_sal.pc == stop_pc) | |
4966 | { | |
4967 | /* We're there already. Just stop stepping now. */ | |
4968 | ecs->event_thread->stop_step = 1; | |
33d62d64 | 4969 | print_end_stepping_range_reason (); |
b2175913 MS |
4970 | stop_stepping (ecs); |
4971 | } | |
4972 | else | |
4973 | { | |
4974 | /* Else just reset the step range and keep going. | |
4975 | No step-resume breakpoint, they don't work for | |
4976 | epilogues, which can have multiple entry paths. */ | |
4977 | ecs->event_thread->step_range_start = stop_func_sal.pc; | |
4978 | ecs->event_thread->step_range_end = stop_func_sal.end; | |
4979 | keep_going (ecs); | |
4980 | } | |
4981 | return; | |
4982 | } | |
4983 | ||
d3169d93 | 4984 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
4985 | This is used to both functions and to skip over code. */ |
4986 | ||
4987 | static void | |
a6d9a66e UW |
4988 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
4989 | struct symtab_and_line sr_sal, | |
44cbf7b5 AC |
4990 | struct frame_id sr_id) |
4991 | { | |
611c83ae PA |
4992 | /* There should never be more than one step-resume or longjmp-resume |
4993 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 4994 | step_resume_breakpoint when one is already active. */ |
4e1c45ea | 4995 | gdb_assert (inferior_thread ()->step_resume_breakpoint == NULL); |
d3169d93 DJ |
4996 | |
4997 | if (debug_infrun) | |
4998 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
4999 | "infrun: inserting step-resume breakpoint at %s\n", |
5000 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 5001 | |
4e1c45ea | 5002 | inferior_thread ()->step_resume_breakpoint |
a6d9a66e | 5003 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, bp_step_resume); |
44cbf7b5 | 5004 | } |
7ce450bd | 5005 | |
d3169d93 | 5006 | /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used |
14e60db5 | 5007 | to skip a potential signal handler. |
7ce450bd | 5008 | |
14e60db5 DJ |
5009 | This is called with the interrupted function's frame. The signal |
5010 | handler, when it returns, will resume the interrupted function at | |
5011 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
5012 | |
5013 | static void | |
44cbf7b5 | 5014 | insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
5015 | { |
5016 | struct symtab_and_line sr_sal; | |
a6d9a66e | 5017 | struct gdbarch *gdbarch; |
d303a6c7 | 5018 | |
f4c1edd8 | 5019 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
5020 | init_sal (&sr_sal); /* initialize to zeros */ |
5021 | ||
a6d9a66e | 5022 | gdbarch = get_frame_arch (return_frame); |
568d6575 | 5023 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 5024 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5025 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 5026 | |
a6d9a66e UW |
5027 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
5028 | get_stack_frame_id (return_frame)); | |
d303a6c7 AC |
5029 | } |
5030 | ||
14e60db5 DJ |
5031 | /* Similar to insert_step_resume_breakpoint_at_frame, except |
5032 | but a breakpoint at the previous frame's PC. This is used to | |
5033 | skip a function after stepping into it (for "next" or if the called | |
5034 | function has no debugging information). | |
5035 | ||
5036 | The current function has almost always been reached by single | |
5037 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
5038 | current function, and the breakpoint will be set at the caller's | |
5039 | resume address. | |
5040 | ||
5041 | This is a separate function rather than reusing | |
5042 | insert_step_resume_breakpoint_at_frame in order to avoid | |
5043 | get_prev_frame, which may stop prematurely (see the implementation | |
c7ce8faa | 5044 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
5045 | |
5046 | static void | |
5047 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
5048 | { | |
5049 | struct symtab_and_line sr_sal; | |
a6d9a66e | 5050 | struct gdbarch *gdbarch; |
14e60db5 DJ |
5051 | |
5052 | /* We shouldn't have gotten here if we don't know where the call site | |
5053 | is. */ | |
c7ce8faa | 5054 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 DJ |
5055 | |
5056 | init_sal (&sr_sal); /* initialize to zeros */ | |
5057 | ||
a6d9a66e | 5058 | gdbarch = frame_unwind_caller_arch (next_frame); |
c7ce8faa DJ |
5059 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
5060 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 5061 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5062 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 5063 | |
a6d9a66e | 5064 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 5065 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
5066 | } |
5067 | ||
611c83ae PA |
5068 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
5069 | new breakpoint at the target of a jmp_buf. The handling of | |
5070 | longjmp-resume uses the same mechanisms used for handling | |
5071 | "step-resume" breakpoints. */ | |
5072 | ||
5073 | static void | |
a6d9a66e | 5074 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae PA |
5075 | { |
5076 | /* There should never be more than one step-resume or longjmp-resume | |
5077 | breakpoint per thread, so we should never be setting a new | |
5078 | longjmp_resume_breakpoint when one is already active. */ | |
4e1c45ea | 5079 | gdb_assert (inferior_thread ()->step_resume_breakpoint == NULL); |
611c83ae PA |
5080 | |
5081 | if (debug_infrun) | |
5082 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5083 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
5084 | paddress (gdbarch, pc)); | |
611c83ae | 5085 | |
4e1c45ea | 5086 | inferior_thread ()->step_resume_breakpoint = |
a6d9a66e | 5087 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); |
611c83ae PA |
5088 | } |
5089 | ||
104c1213 JM |
5090 | static void |
5091 | stop_stepping (struct execution_control_state *ecs) | |
5092 | { | |
527159b7 | 5093 | if (debug_infrun) |
8a9de0e4 | 5094 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
527159b7 | 5095 | |
cd0fc7c3 SS |
5096 | /* Let callers know we don't want to wait for the inferior anymore. */ |
5097 | ecs->wait_some_more = 0; | |
5098 | } | |
5099 | ||
d4f3574e SS |
5100 | /* This function handles various cases where we need to continue |
5101 | waiting for the inferior. */ | |
5102 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
5103 | ||
5104 | static void | |
5105 | keep_going (struct execution_control_state *ecs) | |
5106 | { | |
c4dbc9af PA |
5107 | /* Make sure normal_stop is called if we get a QUIT handled before |
5108 | reaching resume. */ | |
5109 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
5110 | ||
d4f3574e | 5111 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
5112 | ecs->event_thread->prev_pc |
5113 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 5114 | |
d4f3574e SS |
5115 | /* If we did not do break;, it means we should keep running the |
5116 | inferior and not return to debugger. */ | |
5117 | ||
2020b7ab PA |
5118 | if (ecs->event_thread->trap_expected |
5119 | && ecs->event_thread->stop_signal != TARGET_SIGNAL_TRAP) | |
d4f3574e SS |
5120 | { |
5121 | /* We took a signal (which we are supposed to pass through to | |
4e1c45ea PA |
5122 | the inferior, else we'd not get here) and we haven't yet |
5123 | gotten our trap. Simply continue. */ | |
c4dbc9af PA |
5124 | |
5125 | discard_cleanups (old_cleanups); | |
2020b7ab PA |
5126 | resume (currently_stepping (ecs->event_thread), |
5127 | ecs->event_thread->stop_signal); | |
d4f3574e SS |
5128 | } |
5129 | else | |
5130 | { | |
5131 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
5132 | anyway (the user asked that this signal be passed to the |
5133 | child) | |
5134 | -- or -- | |
5135 | The signal was SIGTRAP, e.g. it was our signal, but we | |
5136 | decided we should resume from it. | |
d4f3574e | 5137 | |
c36b740a | 5138 | We're going to run this baby now! |
d4f3574e | 5139 | |
c36b740a VP |
5140 | Note that insert_breakpoints won't try to re-insert |
5141 | already inserted breakpoints. Therefore, we don't | |
5142 | care if breakpoints were already inserted, or not. */ | |
5143 | ||
4e1c45ea | 5144 | if (ecs->event_thread->stepping_over_breakpoint) |
45e8c884 | 5145 | { |
9f5a595d | 5146 | struct regcache *thread_regcache = get_thread_regcache (ecs->ptid); |
abbb1732 | 5147 | |
9f5a595d | 5148 | if (!use_displaced_stepping (get_regcache_arch (thread_regcache))) |
237fc4c9 PA |
5149 | /* Since we can't do a displaced step, we have to remove |
5150 | the breakpoint while we step it. To keep things | |
5151 | simple, we remove them all. */ | |
5152 | remove_breakpoints (); | |
45e8c884 VP |
5153 | } |
5154 | else | |
d4f3574e | 5155 | { |
e236ba44 | 5156 | struct gdb_exception e; |
abbb1732 | 5157 | |
569631c6 UW |
5158 | /* Stop stepping when inserting breakpoints |
5159 | has failed. */ | |
e236ba44 VP |
5160 | TRY_CATCH (e, RETURN_MASK_ERROR) |
5161 | { | |
5162 | insert_breakpoints (); | |
5163 | } | |
5164 | if (e.reason < 0) | |
d4f3574e | 5165 | { |
97bd5475 | 5166 | exception_print (gdb_stderr, e); |
d4f3574e SS |
5167 | stop_stepping (ecs); |
5168 | return; | |
5169 | } | |
d4f3574e SS |
5170 | } |
5171 | ||
4e1c45ea | 5172 | ecs->event_thread->trap_expected = ecs->event_thread->stepping_over_breakpoint; |
d4f3574e SS |
5173 | |
5174 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
5175 | specifies that such a signal should be delivered to the |
5176 | target program). | |
5177 | ||
5178 | Typically, this would occure when a user is debugging a | |
5179 | target monitor on a simulator: the target monitor sets a | |
5180 | breakpoint; the simulator encounters this break-point and | |
5181 | halts the simulation handing control to GDB; GDB, noteing | |
5182 | that the break-point isn't valid, returns control back to the | |
5183 | simulator; the simulator then delivers the hardware | |
5184 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
5185 | ||
2020b7ab PA |
5186 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP |
5187 | && !signal_program[ecs->event_thread->stop_signal]) | |
5188 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; | |
d4f3574e | 5189 | |
c4dbc9af | 5190 | discard_cleanups (old_cleanups); |
2020b7ab PA |
5191 | resume (currently_stepping (ecs->event_thread), |
5192 | ecs->event_thread->stop_signal); | |
d4f3574e SS |
5193 | } |
5194 | ||
488f131b | 5195 | prepare_to_wait (ecs); |
d4f3574e SS |
5196 | } |
5197 | ||
104c1213 JM |
5198 | /* This function normally comes after a resume, before |
5199 | handle_inferior_event exits. It takes care of any last bits of | |
5200 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 5201 | |
104c1213 JM |
5202 | static void |
5203 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 5204 | { |
527159b7 | 5205 | if (debug_infrun) |
8a9de0e4 | 5206 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 5207 | |
104c1213 JM |
5208 | /* This is the old end of the while loop. Let everybody know we |
5209 | want to wait for the inferior some more and get called again | |
5210 | soon. */ | |
5211 | ecs->wait_some_more = 1; | |
c906108c | 5212 | } |
11cf8741 | 5213 | |
33d62d64 JK |
5214 | /* Several print_*_reason functions to print why the inferior has stopped. |
5215 | We always print something when the inferior exits, or receives a signal. | |
5216 | The rest of the cases are dealt with later on in normal_stop and | |
5217 | print_it_typical. Ideally there should be a call to one of these | |
5218 | print_*_reason functions functions from handle_inferior_event each time | |
5219 | stop_stepping is called. */ | |
5220 | ||
5221 | /* Print why the inferior has stopped. | |
5222 | We are done with a step/next/si/ni command, print why the inferior has | |
5223 | stopped. For now print nothing. Print a message only if not in the middle | |
5224 | of doing a "step n" operation for n > 1. */ | |
5225 | ||
5226 | static void | |
5227 | print_end_stepping_range_reason (void) | |
5228 | { | |
5229 | if ((!inferior_thread ()->step_multi || !inferior_thread ()->stop_step) | |
5230 | && ui_out_is_mi_like_p (uiout)) | |
5231 | ui_out_field_string (uiout, "reason", | |
5232 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
5233 | } | |
5234 | ||
5235 | /* The inferior was terminated by a signal, print why it stopped. */ | |
5236 | ||
11cf8741 | 5237 | static void |
33d62d64 | 5238 | print_signal_exited_reason (enum target_signal siggnal) |
11cf8741 | 5239 | { |
33d62d64 JK |
5240 | annotate_signalled (); |
5241 | if (ui_out_is_mi_like_p (uiout)) | |
5242 | ui_out_field_string | |
5243 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
5244 | ui_out_text (uiout, "\nProgram terminated with signal "); | |
5245 | annotate_signal_name (); | |
5246 | ui_out_field_string (uiout, "signal-name", | |
5247 | target_signal_to_name (siggnal)); | |
5248 | annotate_signal_name_end (); | |
5249 | ui_out_text (uiout, ", "); | |
5250 | annotate_signal_string (); | |
5251 | ui_out_field_string (uiout, "signal-meaning", | |
5252 | target_signal_to_string (siggnal)); | |
5253 | annotate_signal_string_end (); | |
5254 | ui_out_text (uiout, ".\n"); | |
5255 | ui_out_text (uiout, "The program no longer exists.\n"); | |
5256 | } | |
5257 | ||
5258 | /* The inferior program is finished, print why it stopped. */ | |
5259 | ||
5260 | static void | |
5261 | print_exited_reason (int exitstatus) | |
5262 | { | |
5263 | annotate_exited (exitstatus); | |
5264 | if (exitstatus) | |
5265 | { | |
5266 | if (ui_out_is_mi_like_p (uiout)) | |
5267 | ui_out_field_string (uiout, "reason", | |
5268 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
5269 | ui_out_text (uiout, "\nProgram exited with code "); | |
5270 | ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) exitstatus); | |
5271 | ui_out_text (uiout, ".\n"); | |
5272 | } | |
5273 | else | |
11cf8741 | 5274 | { |
9dc5e2a9 | 5275 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f | 5276 | ui_out_field_string |
33d62d64 JK |
5277 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); |
5278 | ui_out_text (uiout, "\nProgram exited normally.\n"); | |
5279 | } | |
5280 | /* Support the --return-child-result option. */ | |
5281 | return_child_result_value = exitstatus; | |
5282 | } | |
5283 | ||
5284 | /* Signal received, print why the inferior has stopped. The signal table | |
5285 | tells us to print about it. */ | |
5286 | ||
5287 | static void | |
5288 | print_signal_received_reason (enum target_signal siggnal) | |
5289 | { | |
5290 | annotate_signal (); | |
5291 | ||
5292 | if (siggnal == TARGET_SIGNAL_0 && !ui_out_is_mi_like_p (uiout)) | |
5293 | { | |
5294 | struct thread_info *t = inferior_thread (); | |
5295 | ||
5296 | ui_out_text (uiout, "\n["); | |
5297 | ui_out_field_string (uiout, "thread-name", | |
5298 | target_pid_to_str (t->ptid)); | |
5299 | ui_out_field_fmt (uiout, "thread-id", "] #%d", t->num); | |
5300 | ui_out_text (uiout, " stopped"); | |
5301 | } | |
5302 | else | |
5303 | { | |
5304 | ui_out_text (uiout, "\nProgram received signal "); | |
8b93c638 | 5305 | annotate_signal_name (); |
33d62d64 JK |
5306 | if (ui_out_is_mi_like_p (uiout)) |
5307 | ui_out_field_string | |
5308 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b | 5309 | ui_out_field_string (uiout, "signal-name", |
33d62d64 | 5310 | target_signal_to_name (siggnal)); |
8b93c638 JM |
5311 | annotate_signal_name_end (); |
5312 | ui_out_text (uiout, ", "); | |
5313 | annotate_signal_string (); | |
488f131b | 5314 | ui_out_field_string (uiout, "signal-meaning", |
33d62d64 | 5315 | target_signal_to_string (siggnal)); |
8b93c638 | 5316 | annotate_signal_string_end (); |
33d62d64 JK |
5317 | } |
5318 | ui_out_text (uiout, ".\n"); | |
5319 | } | |
252fbfc8 | 5320 | |
33d62d64 JK |
5321 | /* Reverse execution: target ran out of history info, print why the inferior |
5322 | has stopped. */ | |
252fbfc8 | 5323 | |
33d62d64 JK |
5324 | static void |
5325 | print_no_history_reason (void) | |
5326 | { | |
5327 | ui_out_text (uiout, "\nNo more reverse-execution history.\n"); | |
11cf8741 | 5328 | } |
43ff13b4 | 5329 | |
c906108c SS |
5330 | /* Here to return control to GDB when the inferior stops for real. |
5331 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
5332 | ||
5333 | STOP_PRINT_FRAME nonzero means print the executing frame | |
5334 | (pc, function, args, file, line number and line text). | |
5335 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
5336 | attempting to insert breakpoints. */ | |
5337 | ||
5338 | void | |
96baa820 | 5339 | normal_stop (void) |
c906108c | 5340 | { |
73b65bb0 DJ |
5341 | struct target_waitstatus last; |
5342 | ptid_t last_ptid; | |
29f49a6a | 5343 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
73b65bb0 DJ |
5344 | |
5345 | get_last_target_status (&last_ptid, &last); | |
5346 | ||
29f49a6a PA |
5347 | /* If an exception is thrown from this point on, make sure to |
5348 | propagate GDB's knowledge of the executing state to the | |
5349 | frontend/user running state. A QUIT is an easy exception to see | |
5350 | here, so do this before any filtered output. */ | |
c35b1492 PA |
5351 | if (!non_stop) |
5352 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
5353 | else if (last.kind != TARGET_WAITKIND_SIGNALLED | |
5354 | && last.kind != TARGET_WAITKIND_EXITED) | |
5355 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); | |
29f49a6a | 5356 | |
4f8d22e3 PA |
5357 | /* In non-stop mode, we don't want GDB to switch threads behind the |
5358 | user's back, to avoid races where the user is typing a command to | |
5359 | apply to thread x, but GDB switches to thread y before the user | |
5360 | finishes entering the command. */ | |
5361 | ||
c906108c SS |
5362 | /* As with the notification of thread events, we want to delay |
5363 | notifying the user that we've switched thread context until | |
5364 | the inferior actually stops. | |
5365 | ||
73b65bb0 DJ |
5366 | There's no point in saying anything if the inferior has exited. |
5367 | Note that SIGNALLED here means "exited with a signal", not | |
5368 | "received a signal". */ | |
4f8d22e3 PA |
5369 | if (!non_stop |
5370 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
5371 | && target_has_execution |
5372 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
5373 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
5374 | { |
5375 | target_terminal_ours_for_output (); | |
a3f17187 | 5376 | printf_filtered (_("[Switching to %s]\n"), |
c95310c6 | 5377 | target_pid_to_str (inferior_ptid)); |
b8fa951a | 5378 | annotate_thread_changed (); |
39f77062 | 5379 | previous_inferior_ptid = inferior_ptid; |
c906108c | 5380 | } |
c906108c | 5381 | |
74960c60 | 5382 | if (!breakpoints_always_inserted_mode () && target_has_execution) |
c906108c SS |
5383 | { |
5384 | if (remove_breakpoints ()) | |
5385 | { | |
5386 | target_terminal_ours_for_output (); | |
a3f17187 AC |
5387 | printf_filtered (_("\ |
5388 | Cannot remove breakpoints because program is no longer writable.\n\ | |
a3f17187 | 5389 | Further execution is probably impossible.\n")); |
c906108c SS |
5390 | } |
5391 | } | |
c906108c | 5392 | |
c906108c SS |
5393 | /* If an auto-display called a function and that got a signal, |
5394 | delete that auto-display to avoid an infinite recursion. */ | |
5395 | ||
5396 | if (stopped_by_random_signal) | |
5397 | disable_current_display (); | |
5398 | ||
5399 | /* Don't print a message if in the middle of doing a "step n" | |
5400 | operation for n > 1 */ | |
af679fd0 PA |
5401 | if (target_has_execution |
5402 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
5403 | && last.kind != TARGET_WAITKIND_EXITED | |
5404 | && inferior_thread ()->step_multi | |
414c69f7 | 5405 | && inferior_thread ()->stop_step) |
c906108c SS |
5406 | goto done; |
5407 | ||
5408 | target_terminal_ours (); | |
5409 | ||
7abfe014 DJ |
5410 | /* Set the current source location. This will also happen if we |
5411 | display the frame below, but the current SAL will be incorrect | |
5412 | during a user hook-stop function. */ | |
d729566a | 5413 | if (has_stack_frames () && !stop_stack_dummy) |
7abfe014 DJ |
5414 | set_current_sal_from_frame (get_current_frame (), 1); |
5415 | ||
dd7e2d2b PA |
5416 | /* Let the user/frontend see the threads as stopped. */ |
5417 | do_cleanups (old_chain); | |
5418 | ||
5419 | /* Look up the hook_stop and run it (CLI internally handles problem | |
5420 | of stop_command's pre-hook not existing). */ | |
5421 | if (stop_command) | |
5422 | catch_errors (hook_stop_stub, stop_command, | |
5423 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
5424 | ||
d729566a | 5425 | if (!has_stack_frames ()) |
d51fd4c8 | 5426 | goto done; |
c906108c | 5427 | |
32400beb PA |
5428 | if (last.kind == TARGET_WAITKIND_SIGNALLED |
5429 | || last.kind == TARGET_WAITKIND_EXITED) | |
5430 | goto done; | |
5431 | ||
c906108c SS |
5432 | /* Select innermost stack frame - i.e., current frame is frame 0, |
5433 | and current location is based on that. | |
5434 | Don't do this on return from a stack dummy routine, | |
5435 | or if the program has exited. */ | |
5436 | ||
5437 | if (!stop_stack_dummy) | |
5438 | { | |
0f7d239c | 5439 | select_frame (get_current_frame ()); |
c906108c SS |
5440 | |
5441 | /* Print current location without a level number, if | |
c5aa993b JM |
5442 | we have changed functions or hit a breakpoint. |
5443 | Print source line if we have one. | |
5444 | bpstat_print() contains the logic deciding in detail | |
5445 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 5446 | |
d01a8610 AS |
5447 | /* If --batch-silent is enabled then there's no need to print the current |
5448 | source location, and to try risks causing an error message about | |
5449 | missing source files. */ | |
5450 | if (stop_print_frame && !batch_silent) | |
c906108c SS |
5451 | { |
5452 | int bpstat_ret; | |
5453 | int source_flag; | |
917317f4 | 5454 | int do_frame_printing = 1; |
347bddb7 | 5455 | struct thread_info *tp = inferior_thread (); |
c906108c | 5456 | |
347bddb7 | 5457 | bpstat_ret = bpstat_print (tp->stop_bpstat); |
917317f4 JM |
5458 | switch (bpstat_ret) |
5459 | { | |
5460 | case PRINT_UNKNOWN: | |
b0f4b84b DJ |
5461 | /* If we had hit a shared library event breakpoint, |
5462 | bpstat_print would print out this message. If we hit | |
5463 | an OS-level shared library event, do the same | |
5464 | thing. */ | |
5465 | if (last.kind == TARGET_WAITKIND_LOADED) | |
5466 | { | |
5467 | printf_filtered (_("Stopped due to shared library event\n")); | |
5468 | source_flag = SRC_LINE; /* something bogus */ | |
5469 | do_frame_printing = 0; | |
5470 | break; | |
5471 | } | |
5472 | ||
aa0cd9c1 | 5473 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
5474 | (or should) carry around the function and does (or |
5475 | should) use that when doing a frame comparison. */ | |
414c69f7 | 5476 | if (tp->stop_step |
347bddb7 | 5477 | && frame_id_eq (tp->step_frame_id, |
aa0cd9c1 | 5478 | get_frame_id (get_current_frame ())) |
917317f4 | 5479 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 5480 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 5481 | else |
488f131b | 5482 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
5483 | break; |
5484 | case PRINT_SRC_AND_LOC: | |
488f131b | 5485 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
5486 | break; |
5487 | case PRINT_SRC_ONLY: | |
c5394b80 | 5488 | source_flag = SRC_LINE; |
917317f4 JM |
5489 | break; |
5490 | case PRINT_NOTHING: | |
488f131b | 5491 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
5492 | do_frame_printing = 0; |
5493 | break; | |
5494 | default: | |
e2e0b3e5 | 5495 | internal_error (__FILE__, __LINE__, _("Unknown value.")); |
917317f4 | 5496 | } |
c906108c SS |
5497 | |
5498 | /* The behavior of this routine with respect to the source | |
5499 | flag is: | |
c5394b80 JM |
5500 | SRC_LINE: Print only source line |
5501 | LOCATION: Print only location | |
5502 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 5503 | if (do_frame_printing) |
b04f3ab4 | 5504 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
5505 | |
5506 | /* Display the auto-display expressions. */ | |
5507 | do_displays (); | |
5508 | } | |
5509 | } | |
5510 | ||
5511 | /* Save the function value return registers, if we care. | |
5512 | We might be about to restore their previous contents. */ | |
32400beb | 5513 | if (inferior_thread ()->proceed_to_finish) |
d5c31457 UW |
5514 | { |
5515 | /* This should not be necessary. */ | |
5516 | if (stop_registers) | |
5517 | regcache_xfree (stop_registers); | |
5518 | ||
5519 | /* NB: The copy goes through to the target picking up the value of | |
5520 | all the registers. */ | |
5521 | stop_registers = regcache_dup (get_current_regcache ()); | |
5522 | } | |
c906108c | 5523 | |
aa7d318d | 5524 | if (stop_stack_dummy == STOP_STACK_DUMMY) |
c906108c | 5525 | { |
b89667eb DE |
5526 | /* Pop the empty frame that contains the stack dummy. |
5527 | This also restores inferior state prior to the call | |
5528 | (struct inferior_thread_state). */ | |
5529 | struct frame_info *frame = get_current_frame (); | |
abbb1732 | 5530 | |
b89667eb DE |
5531 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); |
5532 | frame_pop (frame); | |
5533 | /* frame_pop() calls reinit_frame_cache as the last thing it does | |
5534 | which means there's currently no selected frame. We don't need | |
5535 | to re-establish a selected frame if the dummy call returns normally, | |
5536 | that will be done by restore_inferior_status. However, we do have | |
5537 | to handle the case where the dummy call is returning after being | |
5538 | stopped (e.g. the dummy call previously hit a breakpoint). We | |
5539 | can't know which case we have so just always re-establish a | |
5540 | selected frame here. */ | |
0f7d239c | 5541 | select_frame (get_current_frame ()); |
c906108c SS |
5542 | } |
5543 | ||
c906108c SS |
5544 | done: |
5545 | annotate_stopped (); | |
41d2bdb4 PA |
5546 | |
5547 | /* Suppress the stop observer if we're in the middle of: | |
5548 | ||
5549 | - a step n (n > 1), as there still more steps to be done. | |
5550 | ||
5551 | - a "finish" command, as the observer will be called in | |
5552 | finish_command_continuation, so it can include the inferior | |
5553 | function's return value. | |
5554 | ||
5555 | - calling an inferior function, as we pretend we inferior didn't | |
5556 | run at all. The return value of the call is handled by the | |
5557 | expression evaluator, through call_function_by_hand. */ | |
5558 | ||
5559 | if (!target_has_execution | |
5560 | || last.kind == TARGET_WAITKIND_SIGNALLED | |
5561 | || last.kind == TARGET_WAITKIND_EXITED | |
5562 | || (!inferior_thread ()->step_multi | |
5563 | && !(inferior_thread ()->stop_bpstat | |
c5a4d20b PA |
5564 | && inferior_thread ()->proceed_to_finish) |
5565 | && !inferior_thread ()->in_infcall)) | |
347bddb7 PA |
5566 | { |
5567 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
1d33d6ba VP |
5568 | observer_notify_normal_stop (inferior_thread ()->stop_bpstat, |
5569 | stop_print_frame); | |
347bddb7 | 5570 | else |
1d33d6ba | 5571 | observer_notify_normal_stop (NULL, stop_print_frame); |
347bddb7 | 5572 | } |
347bddb7 | 5573 | |
48844aa6 PA |
5574 | if (target_has_execution) |
5575 | { | |
5576 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
5577 | && last.kind != TARGET_WAITKIND_EXITED) | |
5578 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
5579 | Delete any breakpoint that is to be deleted at the next stop. */ | |
5580 | breakpoint_auto_delete (inferior_thread ()->stop_bpstat); | |
94cc34af | 5581 | } |
6c95b8df PA |
5582 | |
5583 | /* Try to get rid of automatically added inferiors that are no | |
5584 | longer needed. Keeping those around slows down things linearly. | |
5585 | Note that this never removes the current inferior. */ | |
5586 | prune_inferiors (); | |
c906108c SS |
5587 | } |
5588 | ||
5589 | static int | |
96baa820 | 5590 | hook_stop_stub (void *cmd) |
c906108c | 5591 | { |
5913bcb0 | 5592 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
5593 | return (0); |
5594 | } | |
5595 | \f | |
c5aa993b | 5596 | int |
96baa820 | 5597 | signal_stop_state (int signo) |
c906108c | 5598 | { |
d6b48e9c | 5599 | return signal_stop[signo]; |
c906108c SS |
5600 | } |
5601 | ||
c5aa993b | 5602 | int |
96baa820 | 5603 | signal_print_state (int signo) |
c906108c SS |
5604 | { |
5605 | return signal_print[signo]; | |
5606 | } | |
5607 | ||
c5aa993b | 5608 | int |
96baa820 | 5609 | signal_pass_state (int signo) |
c906108c SS |
5610 | { |
5611 | return signal_program[signo]; | |
5612 | } | |
5613 | ||
488f131b | 5614 | int |
7bda5e4a | 5615 | signal_stop_update (int signo, int state) |
d4f3574e SS |
5616 | { |
5617 | int ret = signal_stop[signo]; | |
abbb1732 | 5618 | |
d4f3574e SS |
5619 | signal_stop[signo] = state; |
5620 | return ret; | |
5621 | } | |
5622 | ||
488f131b | 5623 | int |
7bda5e4a | 5624 | signal_print_update (int signo, int state) |
d4f3574e SS |
5625 | { |
5626 | int ret = signal_print[signo]; | |
abbb1732 | 5627 | |
d4f3574e SS |
5628 | signal_print[signo] = state; |
5629 | return ret; | |
5630 | } | |
5631 | ||
488f131b | 5632 | int |
7bda5e4a | 5633 | signal_pass_update (int signo, int state) |
d4f3574e SS |
5634 | { |
5635 | int ret = signal_program[signo]; | |
abbb1732 | 5636 | |
d4f3574e SS |
5637 | signal_program[signo] = state; |
5638 | return ret; | |
5639 | } | |
5640 | ||
c906108c | 5641 | static void |
96baa820 | 5642 | sig_print_header (void) |
c906108c | 5643 | { |
a3f17187 AC |
5644 | printf_filtered (_("\ |
5645 | Signal Stop\tPrint\tPass to program\tDescription\n")); | |
c906108c SS |
5646 | } |
5647 | ||
5648 | static void | |
96baa820 | 5649 | sig_print_info (enum target_signal oursig) |
c906108c | 5650 | { |
54363045 | 5651 | const char *name = target_signal_to_name (oursig); |
c906108c | 5652 | int name_padding = 13 - strlen (name); |
96baa820 | 5653 | |
c906108c SS |
5654 | if (name_padding <= 0) |
5655 | name_padding = 0; | |
5656 | ||
5657 | printf_filtered ("%s", name); | |
488f131b | 5658 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
5659 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
5660 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
5661 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
5662 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
5663 | } | |
5664 | ||
5665 | /* Specify how various signals in the inferior should be handled. */ | |
5666 | ||
5667 | static void | |
96baa820 | 5668 | handle_command (char *args, int from_tty) |
c906108c SS |
5669 | { |
5670 | char **argv; | |
5671 | int digits, wordlen; | |
5672 | int sigfirst, signum, siglast; | |
5673 | enum target_signal oursig; | |
5674 | int allsigs; | |
5675 | int nsigs; | |
5676 | unsigned char *sigs; | |
5677 | struct cleanup *old_chain; | |
5678 | ||
5679 | if (args == NULL) | |
5680 | { | |
e2e0b3e5 | 5681 | error_no_arg (_("signal to handle")); |
c906108c SS |
5682 | } |
5683 | ||
5684 | /* Allocate and zero an array of flags for which signals to handle. */ | |
5685 | ||
5686 | nsigs = (int) TARGET_SIGNAL_LAST; | |
5687 | sigs = (unsigned char *) alloca (nsigs); | |
5688 | memset (sigs, 0, nsigs); | |
5689 | ||
5690 | /* Break the command line up into args. */ | |
5691 | ||
d1a41061 | 5692 | argv = gdb_buildargv (args); |
7a292a7a | 5693 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
5694 | |
5695 | /* Walk through the args, looking for signal oursigs, signal names, and | |
5696 | actions. Signal numbers and signal names may be interspersed with | |
5697 | actions, with the actions being performed for all signals cumulatively | |
5698 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
5699 | ||
5700 | while (*argv != NULL) | |
5701 | { | |
5702 | wordlen = strlen (*argv); | |
5703 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
5704 | {; | |
5705 | } | |
5706 | allsigs = 0; | |
5707 | sigfirst = siglast = -1; | |
5708 | ||
5709 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
5710 | { | |
5711 | /* Apply action to all signals except those used by the | |
5712 | debugger. Silently skip those. */ | |
5713 | allsigs = 1; | |
5714 | sigfirst = 0; | |
5715 | siglast = nsigs - 1; | |
5716 | } | |
5717 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
5718 | { | |
5719 | SET_SIGS (nsigs, sigs, signal_stop); | |
5720 | SET_SIGS (nsigs, sigs, signal_print); | |
5721 | } | |
5722 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
5723 | { | |
5724 | UNSET_SIGS (nsigs, sigs, signal_program); | |
5725 | } | |
5726 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
5727 | { | |
5728 | SET_SIGS (nsigs, sigs, signal_print); | |
5729 | } | |
5730 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
5731 | { | |
5732 | SET_SIGS (nsigs, sigs, signal_program); | |
5733 | } | |
5734 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
5735 | { | |
5736 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
5737 | } | |
5738 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
5739 | { | |
5740 | SET_SIGS (nsigs, sigs, signal_program); | |
5741 | } | |
5742 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
5743 | { | |
5744 | UNSET_SIGS (nsigs, sigs, signal_print); | |
5745 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
5746 | } | |
5747 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
5748 | { | |
5749 | UNSET_SIGS (nsigs, sigs, signal_program); | |
5750 | } | |
5751 | else if (digits > 0) | |
5752 | { | |
5753 | /* It is numeric. The numeric signal refers to our own | |
5754 | internal signal numbering from target.h, not to host/target | |
5755 | signal number. This is a feature; users really should be | |
5756 | using symbolic names anyway, and the common ones like | |
5757 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
5758 | ||
5759 | sigfirst = siglast = (int) | |
5760 | target_signal_from_command (atoi (*argv)); | |
5761 | if ((*argv)[digits] == '-') | |
5762 | { | |
5763 | siglast = (int) | |
5764 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
5765 | } | |
5766 | if (sigfirst > siglast) | |
5767 | { | |
5768 | /* Bet he didn't figure we'd think of this case... */ | |
5769 | signum = sigfirst; | |
5770 | sigfirst = siglast; | |
5771 | siglast = signum; | |
5772 | } | |
5773 | } | |
5774 | else | |
5775 | { | |
5776 | oursig = target_signal_from_name (*argv); | |
5777 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
5778 | { | |
5779 | sigfirst = siglast = (int) oursig; | |
5780 | } | |
5781 | else | |
5782 | { | |
5783 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 5784 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
5785 | } |
5786 | } | |
5787 | ||
5788 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 5789 | which signals to apply actions to. */ |
c906108c SS |
5790 | |
5791 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
5792 | { | |
5793 | switch ((enum target_signal) signum) | |
5794 | { | |
5795 | case TARGET_SIGNAL_TRAP: | |
5796 | case TARGET_SIGNAL_INT: | |
5797 | if (!allsigs && !sigs[signum]) | |
5798 | { | |
9e2f0ad4 HZ |
5799 | if (query (_("%s is used by the debugger.\n\ |
5800 | Are you sure you want to change it? "), target_signal_to_name ((enum target_signal) signum))) | |
c906108c SS |
5801 | { |
5802 | sigs[signum] = 1; | |
5803 | } | |
5804 | else | |
5805 | { | |
a3f17187 | 5806 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
5807 | gdb_flush (gdb_stdout); |
5808 | } | |
5809 | } | |
5810 | break; | |
5811 | case TARGET_SIGNAL_0: | |
5812 | case TARGET_SIGNAL_DEFAULT: | |
5813 | case TARGET_SIGNAL_UNKNOWN: | |
5814 | /* Make sure that "all" doesn't print these. */ | |
5815 | break; | |
5816 | default: | |
5817 | sigs[signum] = 1; | |
5818 | break; | |
5819 | } | |
5820 | } | |
5821 | ||
5822 | argv++; | |
5823 | } | |
5824 | ||
3a031f65 PA |
5825 | for (signum = 0; signum < nsigs; signum++) |
5826 | if (sigs[signum]) | |
5827 | { | |
5828 | target_notice_signals (inferior_ptid); | |
c906108c | 5829 | |
3a031f65 PA |
5830 | if (from_tty) |
5831 | { | |
5832 | /* Show the results. */ | |
5833 | sig_print_header (); | |
5834 | for (; signum < nsigs; signum++) | |
5835 | if (sigs[signum]) | |
5836 | sig_print_info (signum); | |
5837 | } | |
5838 | ||
5839 | break; | |
5840 | } | |
c906108c SS |
5841 | |
5842 | do_cleanups (old_chain); | |
5843 | } | |
5844 | ||
5845 | static void | |
96baa820 | 5846 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
5847 | { |
5848 | char **argv; | |
5849 | struct cleanup *old_chain; | |
5850 | ||
d1a41061 PP |
5851 | if (args == NULL) |
5852 | error_no_arg (_("xdb command")); | |
5853 | ||
c906108c SS |
5854 | /* Break the command line up into args. */ |
5855 | ||
d1a41061 | 5856 | argv = gdb_buildargv (args); |
7a292a7a | 5857 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
5858 | if (argv[1] != (char *) NULL) |
5859 | { | |
5860 | char *argBuf; | |
5861 | int bufLen; | |
5862 | ||
5863 | bufLen = strlen (argv[0]) + 20; | |
5864 | argBuf = (char *) xmalloc (bufLen); | |
5865 | if (argBuf) | |
5866 | { | |
5867 | int validFlag = 1; | |
5868 | enum target_signal oursig; | |
5869 | ||
5870 | oursig = target_signal_from_name (argv[0]); | |
5871 | memset (argBuf, 0, bufLen); | |
5872 | if (strcmp (argv[1], "Q") == 0) | |
5873 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
5874 | else | |
5875 | { | |
5876 | if (strcmp (argv[1], "s") == 0) | |
5877 | { | |
5878 | if (!signal_stop[oursig]) | |
5879 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
5880 | else | |
5881 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
5882 | } | |
5883 | else if (strcmp (argv[1], "i") == 0) | |
5884 | { | |
5885 | if (!signal_program[oursig]) | |
5886 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
5887 | else | |
5888 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
5889 | } | |
5890 | else if (strcmp (argv[1], "r") == 0) | |
5891 | { | |
5892 | if (!signal_print[oursig]) | |
5893 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
5894 | else | |
5895 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
5896 | } | |
5897 | else | |
5898 | validFlag = 0; | |
5899 | } | |
5900 | if (validFlag) | |
5901 | handle_command (argBuf, from_tty); | |
5902 | else | |
a3f17187 | 5903 | printf_filtered (_("Invalid signal handling flag.\n")); |
c906108c | 5904 | if (argBuf) |
b8c9b27d | 5905 | xfree (argBuf); |
c906108c SS |
5906 | } |
5907 | } | |
5908 | do_cleanups (old_chain); | |
5909 | } | |
5910 | ||
5911 | /* Print current contents of the tables set by the handle command. | |
5912 | It is possible we should just be printing signals actually used | |
5913 | by the current target (but for things to work right when switching | |
5914 | targets, all signals should be in the signal tables). */ | |
5915 | ||
5916 | static void | |
96baa820 | 5917 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
5918 | { |
5919 | enum target_signal oursig; | |
abbb1732 | 5920 | |
c906108c SS |
5921 | sig_print_header (); |
5922 | ||
5923 | if (signum_exp) | |
5924 | { | |
5925 | /* First see if this is a symbol name. */ | |
5926 | oursig = target_signal_from_name (signum_exp); | |
5927 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
5928 | { | |
5929 | /* No, try numeric. */ | |
5930 | oursig = | |
bb518678 | 5931 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
5932 | } |
5933 | sig_print_info (oursig); | |
5934 | return; | |
5935 | } | |
5936 | ||
5937 | printf_filtered ("\n"); | |
5938 | /* These ugly casts brought to you by the native VAX compiler. */ | |
5939 | for (oursig = TARGET_SIGNAL_FIRST; | |
5940 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
5941 | oursig = (enum target_signal) ((int) oursig + 1)) | |
5942 | { | |
5943 | QUIT; | |
5944 | ||
5945 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 5946 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
5947 | sig_print_info (oursig); |
5948 | } | |
5949 | ||
a3f17187 | 5950 | printf_filtered (_("\nUse the \"handle\" command to change these tables.\n")); |
c906108c | 5951 | } |
4aa995e1 PA |
5952 | |
5953 | /* The $_siginfo convenience variable is a bit special. We don't know | |
5954 | for sure the type of the value until we actually have a chance to | |
5955 | fetch the data. The type can change depending on gdbarch, so it it | |
5956 | also dependent on which thread you have selected. | |
5957 | ||
5958 | 1. making $_siginfo be an internalvar that creates a new value on | |
5959 | access. | |
5960 | ||
5961 | 2. making the value of $_siginfo be an lval_computed value. */ | |
5962 | ||
5963 | /* This function implements the lval_computed support for reading a | |
5964 | $_siginfo value. */ | |
5965 | ||
5966 | static void | |
5967 | siginfo_value_read (struct value *v) | |
5968 | { | |
5969 | LONGEST transferred; | |
5970 | ||
5971 | transferred = | |
5972 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
5973 | NULL, | |
5974 | value_contents_all_raw (v), | |
5975 | value_offset (v), | |
5976 | TYPE_LENGTH (value_type (v))); | |
5977 | ||
5978 | if (transferred != TYPE_LENGTH (value_type (v))) | |
5979 | error (_("Unable to read siginfo")); | |
5980 | } | |
5981 | ||
5982 | /* This function implements the lval_computed support for writing a | |
5983 | $_siginfo value. */ | |
5984 | ||
5985 | static void | |
5986 | siginfo_value_write (struct value *v, struct value *fromval) | |
5987 | { | |
5988 | LONGEST transferred; | |
5989 | ||
5990 | transferred = target_write (¤t_target, | |
5991 | TARGET_OBJECT_SIGNAL_INFO, | |
5992 | NULL, | |
5993 | value_contents_all_raw (fromval), | |
5994 | value_offset (v), | |
5995 | TYPE_LENGTH (value_type (fromval))); | |
5996 | ||
5997 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
5998 | error (_("Unable to write siginfo")); | |
5999 | } | |
6000 | ||
6001 | static struct lval_funcs siginfo_value_funcs = | |
6002 | { | |
6003 | siginfo_value_read, | |
6004 | siginfo_value_write | |
6005 | }; | |
6006 | ||
6007 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
6008 | the current thread using architecture GDBARCH. Return a void value |
6009 | if there's no object available. */ | |
4aa995e1 | 6010 | |
2c0b251b | 6011 | static struct value * |
78267919 | 6012 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var) |
4aa995e1 | 6013 | { |
4aa995e1 | 6014 | if (target_has_stack |
78267919 UW |
6015 | && !ptid_equal (inferior_ptid, null_ptid) |
6016 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
4aa995e1 | 6017 | { |
78267919 | 6018 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 6019 | |
78267919 | 6020 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
6021 | } |
6022 | ||
78267919 | 6023 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
6024 | } |
6025 | ||
c906108c | 6026 | \f |
b89667eb DE |
6027 | /* Inferior thread state. |
6028 | These are details related to the inferior itself, and don't include | |
6029 | things like what frame the user had selected or what gdb was doing | |
6030 | with the target at the time. | |
6031 | For inferior function calls these are things we want to restore | |
6032 | regardless of whether the function call successfully completes | |
6033 | or the dummy frame has to be manually popped. */ | |
6034 | ||
6035 | struct inferior_thread_state | |
7a292a7a SS |
6036 | { |
6037 | enum target_signal stop_signal; | |
6038 | CORE_ADDR stop_pc; | |
b89667eb DE |
6039 | struct regcache *registers; |
6040 | }; | |
6041 | ||
6042 | struct inferior_thread_state * | |
6043 | save_inferior_thread_state (void) | |
6044 | { | |
6045 | struct inferior_thread_state *inf_state = XMALLOC (struct inferior_thread_state); | |
6046 | struct thread_info *tp = inferior_thread (); | |
6047 | ||
6048 | inf_state->stop_signal = tp->stop_signal; | |
6049 | inf_state->stop_pc = stop_pc; | |
6050 | ||
6051 | inf_state->registers = regcache_dup (get_current_regcache ()); | |
6052 | ||
6053 | return inf_state; | |
6054 | } | |
6055 | ||
6056 | /* Restore inferior session state to INF_STATE. */ | |
6057 | ||
6058 | void | |
6059 | restore_inferior_thread_state (struct inferior_thread_state *inf_state) | |
6060 | { | |
6061 | struct thread_info *tp = inferior_thread (); | |
6062 | ||
6063 | tp->stop_signal = inf_state->stop_signal; | |
6064 | stop_pc = inf_state->stop_pc; | |
6065 | ||
6066 | /* The inferior can be gone if the user types "print exit(0)" | |
6067 | (and perhaps other times). */ | |
6068 | if (target_has_execution) | |
6069 | /* NB: The register write goes through to the target. */ | |
6070 | regcache_cpy (get_current_regcache (), inf_state->registers); | |
6071 | regcache_xfree (inf_state->registers); | |
6072 | xfree (inf_state); | |
6073 | } | |
6074 | ||
6075 | static void | |
6076 | do_restore_inferior_thread_state_cleanup (void *state) | |
6077 | { | |
6078 | restore_inferior_thread_state (state); | |
6079 | } | |
6080 | ||
6081 | struct cleanup * | |
6082 | make_cleanup_restore_inferior_thread_state (struct inferior_thread_state *inf_state) | |
6083 | { | |
6084 | return make_cleanup (do_restore_inferior_thread_state_cleanup, inf_state); | |
6085 | } | |
6086 | ||
6087 | void | |
6088 | discard_inferior_thread_state (struct inferior_thread_state *inf_state) | |
6089 | { | |
6090 | regcache_xfree (inf_state->registers); | |
6091 | xfree (inf_state); | |
6092 | } | |
6093 | ||
6094 | struct regcache * | |
6095 | get_inferior_thread_state_regcache (struct inferior_thread_state *inf_state) | |
6096 | { | |
6097 | return inf_state->registers; | |
6098 | } | |
6099 | ||
6100 | /* Session related state for inferior function calls. | |
6101 | These are the additional bits of state that need to be restored | |
6102 | when an inferior function call successfully completes. */ | |
6103 | ||
6104 | struct inferior_status | |
6105 | { | |
7a292a7a SS |
6106 | bpstat stop_bpstat; |
6107 | int stop_step; | |
aa7d318d | 6108 | enum stop_stack_kind stop_stack_dummy; |
7a292a7a | 6109 | int stopped_by_random_signal; |
ca67fcb8 | 6110 | int stepping_over_breakpoint; |
7a292a7a SS |
6111 | CORE_ADDR step_range_start; |
6112 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 6113 | struct frame_id step_frame_id; |
edb3359d | 6114 | struct frame_id step_stack_frame_id; |
5fbbeb29 | 6115 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
6116 | CORE_ADDR step_resume_break_address; |
6117 | int stop_after_trap; | |
c0236d92 | 6118 | int stop_soon; |
7a292a7a | 6119 | |
b89667eb | 6120 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe AC |
6121 | struct frame_id selected_frame_id; |
6122 | ||
7a292a7a | 6123 | int proceed_to_finish; |
c5a4d20b | 6124 | int in_infcall; |
7a292a7a SS |
6125 | }; |
6126 | ||
c906108c | 6127 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 6128 | connection. */ |
c906108c | 6129 | |
7a292a7a | 6130 | struct inferior_status * |
b89667eb | 6131 | save_inferior_status (void) |
c906108c | 6132 | { |
72cec141 | 6133 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
4e1c45ea | 6134 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 6135 | struct inferior *inf = current_inferior (); |
7a292a7a | 6136 | |
414c69f7 | 6137 | inf_status->stop_step = tp->stop_step; |
c906108c SS |
6138 | inf_status->stop_stack_dummy = stop_stack_dummy; |
6139 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
4e1c45ea PA |
6140 | inf_status->stepping_over_breakpoint = tp->trap_expected; |
6141 | inf_status->step_range_start = tp->step_range_start; | |
6142 | inf_status->step_range_end = tp->step_range_end; | |
6143 | inf_status->step_frame_id = tp->step_frame_id; | |
edb3359d | 6144 | inf_status->step_stack_frame_id = tp->step_stack_frame_id; |
078130d0 | 6145 | inf_status->step_over_calls = tp->step_over_calls; |
c906108c | 6146 | inf_status->stop_after_trap = stop_after_trap; |
d6b48e9c | 6147 | inf_status->stop_soon = inf->stop_soon; |
c906108c SS |
6148 | /* Save original bpstat chain here; replace it with copy of chain. |
6149 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
6150 | hand them back the original chain when restore_inferior_status is |
6151 | called. */ | |
347bddb7 PA |
6152 | inf_status->stop_bpstat = tp->stop_bpstat; |
6153 | tp->stop_bpstat = bpstat_copy (tp->stop_bpstat); | |
32400beb | 6154 | inf_status->proceed_to_finish = tp->proceed_to_finish; |
c5a4d20b | 6155 | inf_status->in_infcall = tp->in_infcall; |
c5aa993b | 6156 | |
206415a3 | 6157 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 6158 | |
7a292a7a | 6159 | return inf_status; |
c906108c SS |
6160 | } |
6161 | ||
c906108c | 6162 | static int |
96baa820 | 6163 | restore_selected_frame (void *args) |
c906108c | 6164 | { |
488f131b | 6165 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 6166 | struct frame_info *frame; |
c906108c | 6167 | |
101dcfbe | 6168 | frame = frame_find_by_id (*fid); |
c906108c | 6169 | |
aa0cd9c1 AC |
6170 | /* If inf_status->selected_frame_id is NULL, there was no previously |
6171 | selected frame. */ | |
101dcfbe | 6172 | if (frame == NULL) |
c906108c | 6173 | { |
8a3fe4f8 | 6174 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
6175 | return 0; |
6176 | } | |
6177 | ||
0f7d239c | 6178 | select_frame (frame); |
c906108c SS |
6179 | |
6180 | return (1); | |
6181 | } | |
6182 | ||
b89667eb DE |
6183 | /* Restore inferior session state to INF_STATUS. */ |
6184 | ||
c906108c | 6185 | void |
96baa820 | 6186 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c | 6187 | { |
4e1c45ea | 6188 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 6189 | struct inferior *inf = current_inferior (); |
4e1c45ea | 6190 | |
414c69f7 | 6191 | tp->stop_step = inf_status->stop_step; |
c906108c SS |
6192 | stop_stack_dummy = inf_status->stop_stack_dummy; |
6193 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
4e1c45ea PA |
6194 | tp->trap_expected = inf_status->stepping_over_breakpoint; |
6195 | tp->step_range_start = inf_status->step_range_start; | |
6196 | tp->step_range_end = inf_status->step_range_end; | |
6197 | tp->step_frame_id = inf_status->step_frame_id; | |
edb3359d | 6198 | tp->step_stack_frame_id = inf_status->step_stack_frame_id; |
078130d0 | 6199 | tp->step_over_calls = inf_status->step_over_calls; |
c906108c | 6200 | stop_after_trap = inf_status->stop_after_trap; |
d6b48e9c | 6201 | inf->stop_soon = inf_status->stop_soon; |
347bddb7 PA |
6202 | bpstat_clear (&tp->stop_bpstat); |
6203 | tp->stop_bpstat = inf_status->stop_bpstat; | |
b89667eb | 6204 | inf_status->stop_bpstat = NULL; |
32400beb | 6205 | tp->proceed_to_finish = inf_status->proceed_to_finish; |
c5a4d20b | 6206 | tp->in_infcall = inf_status->in_infcall; |
c906108c | 6207 | |
b89667eb | 6208 | if (target_has_stack) |
c906108c | 6209 | { |
c906108c | 6210 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
6211 | walking the stack might encounter a garbage pointer and |
6212 | error() trying to dereference it. */ | |
488f131b JB |
6213 | if (catch_errors |
6214 | (restore_selected_frame, &inf_status->selected_frame_id, | |
6215 | "Unable to restore previously selected frame:\n", | |
6216 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
6217 | /* Error in restoring the selected frame. Select the innermost |
6218 | frame. */ | |
0f7d239c | 6219 | select_frame (get_current_frame ()); |
c906108c | 6220 | } |
c906108c | 6221 | |
72cec141 | 6222 | xfree (inf_status); |
7a292a7a | 6223 | } |
c906108c | 6224 | |
74b7792f AC |
6225 | static void |
6226 | do_restore_inferior_status_cleanup (void *sts) | |
6227 | { | |
6228 | restore_inferior_status (sts); | |
6229 | } | |
6230 | ||
6231 | struct cleanup * | |
6232 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
6233 | { | |
6234 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
6235 | } | |
6236 | ||
c906108c | 6237 | void |
96baa820 | 6238 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
6239 | { |
6240 | /* See save_inferior_status for info on stop_bpstat. */ | |
6241 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 | 6242 | xfree (inf_status); |
7a292a7a | 6243 | } |
b89667eb | 6244 | \f |
47932f85 | 6245 | int |
3a3e9ee3 | 6246 | inferior_has_forked (ptid_t pid, ptid_t *child_pid) |
47932f85 DJ |
6247 | { |
6248 | struct target_waitstatus last; | |
6249 | ptid_t last_ptid; | |
6250 | ||
6251 | get_last_target_status (&last_ptid, &last); | |
6252 | ||
6253 | if (last.kind != TARGET_WAITKIND_FORKED) | |
6254 | return 0; | |
6255 | ||
3a3e9ee3 | 6256 | if (!ptid_equal (last_ptid, pid)) |
47932f85 DJ |
6257 | return 0; |
6258 | ||
6259 | *child_pid = last.value.related_pid; | |
6260 | return 1; | |
6261 | } | |
6262 | ||
6263 | int | |
3a3e9ee3 | 6264 | inferior_has_vforked (ptid_t pid, ptid_t *child_pid) |
47932f85 DJ |
6265 | { |
6266 | struct target_waitstatus last; | |
6267 | ptid_t last_ptid; | |
6268 | ||
6269 | get_last_target_status (&last_ptid, &last); | |
6270 | ||
6271 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
6272 | return 0; | |
6273 | ||
3a3e9ee3 | 6274 | if (!ptid_equal (last_ptid, pid)) |
47932f85 DJ |
6275 | return 0; |
6276 | ||
6277 | *child_pid = last.value.related_pid; | |
6278 | return 1; | |
6279 | } | |
6280 | ||
6281 | int | |
3a3e9ee3 | 6282 | inferior_has_execd (ptid_t pid, char **execd_pathname) |
47932f85 DJ |
6283 | { |
6284 | struct target_waitstatus last; | |
6285 | ptid_t last_ptid; | |
6286 | ||
6287 | get_last_target_status (&last_ptid, &last); | |
6288 | ||
6289 | if (last.kind != TARGET_WAITKIND_EXECD) | |
6290 | return 0; | |
6291 | ||
3a3e9ee3 | 6292 | if (!ptid_equal (last_ptid, pid)) |
47932f85 DJ |
6293 | return 0; |
6294 | ||
6295 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
6296 | return 1; | |
6297 | } | |
6298 | ||
a96d9b2e SDJ |
6299 | int |
6300 | inferior_has_called_syscall (ptid_t pid, int *syscall_number) | |
6301 | { | |
6302 | struct target_waitstatus last; | |
6303 | ptid_t last_ptid; | |
6304 | ||
6305 | get_last_target_status (&last_ptid, &last); | |
6306 | ||
6307 | if (last.kind != TARGET_WAITKIND_SYSCALL_ENTRY && | |
6308 | last.kind != TARGET_WAITKIND_SYSCALL_RETURN) | |
6309 | return 0; | |
6310 | ||
6311 | if (!ptid_equal (last_ptid, pid)) | |
6312 | return 0; | |
6313 | ||
6314 | *syscall_number = last.value.syscall_number; | |
6315 | return 1; | |
6316 | } | |
6317 | ||
ca6724c1 KB |
6318 | /* Oft used ptids */ |
6319 | ptid_t null_ptid; | |
6320 | ptid_t minus_one_ptid; | |
6321 | ||
6322 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 6323 | |
ca6724c1 KB |
6324 | ptid_t |
6325 | ptid_build (int pid, long lwp, long tid) | |
6326 | { | |
6327 | ptid_t ptid; | |
6328 | ||
6329 | ptid.pid = pid; | |
6330 | ptid.lwp = lwp; | |
6331 | ptid.tid = tid; | |
6332 | return ptid; | |
6333 | } | |
6334 | ||
6335 | /* Create a ptid from just a pid. */ | |
6336 | ||
6337 | ptid_t | |
6338 | pid_to_ptid (int pid) | |
6339 | { | |
6340 | return ptid_build (pid, 0, 0); | |
6341 | } | |
6342 | ||
6343 | /* Fetch the pid (process id) component from a ptid. */ | |
6344 | ||
6345 | int | |
6346 | ptid_get_pid (ptid_t ptid) | |
6347 | { | |
6348 | return ptid.pid; | |
6349 | } | |
6350 | ||
6351 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
6352 | ||
6353 | long | |
6354 | ptid_get_lwp (ptid_t ptid) | |
6355 | { | |
6356 | return ptid.lwp; | |
6357 | } | |
6358 | ||
6359 | /* Fetch the tid (thread id) component from a ptid. */ | |
6360 | ||
6361 | long | |
6362 | ptid_get_tid (ptid_t ptid) | |
6363 | { | |
6364 | return ptid.tid; | |
6365 | } | |
6366 | ||
6367 | /* ptid_equal() is used to test equality of two ptids. */ | |
6368 | ||
6369 | int | |
6370 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
6371 | { | |
6372 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 6373 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
6374 | } |
6375 | ||
252fbfc8 PA |
6376 | /* Returns true if PTID represents a process. */ |
6377 | ||
6378 | int | |
6379 | ptid_is_pid (ptid_t ptid) | |
6380 | { | |
6381 | if (ptid_equal (minus_one_ptid, ptid)) | |
6382 | return 0; | |
6383 | if (ptid_equal (null_ptid, ptid)) | |
6384 | return 0; | |
6385 | ||
6386 | return (ptid_get_lwp (ptid) == 0 && ptid_get_tid (ptid) == 0); | |
6387 | } | |
6388 | ||
0723dbf5 PA |
6389 | int |
6390 | ptid_match (ptid_t ptid, ptid_t filter) | |
6391 | { | |
6392 | /* Since both parameters have the same type, prevent easy mistakes | |
6393 | from happening. */ | |
6394 | gdb_assert (!ptid_equal (ptid, minus_one_ptid) | |
5f25d77d | 6395 | && !ptid_equal (ptid, null_ptid)); |
0723dbf5 PA |
6396 | |
6397 | if (ptid_equal (filter, minus_one_ptid)) | |
6398 | return 1; | |
6399 | if (ptid_is_pid (filter) | |
6400 | && ptid_get_pid (ptid) == ptid_get_pid (filter)) | |
6401 | return 1; | |
6402 | else if (ptid_equal (ptid, filter)) | |
6403 | return 1; | |
6404 | ||
6405 | return 0; | |
6406 | } | |
6407 | ||
ca6724c1 KB |
6408 | /* restore_inferior_ptid() will be used by the cleanup machinery |
6409 | to restore the inferior_ptid value saved in a call to | |
6410 | save_inferior_ptid(). */ | |
ce696e05 KB |
6411 | |
6412 | static void | |
6413 | restore_inferior_ptid (void *arg) | |
6414 | { | |
6415 | ptid_t *saved_ptid_ptr = arg; | |
abbb1732 | 6416 | |
ce696e05 KB |
6417 | inferior_ptid = *saved_ptid_ptr; |
6418 | xfree (arg); | |
6419 | } | |
6420 | ||
6421 | /* Save the value of inferior_ptid so that it may be restored by a | |
6422 | later call to do_cleanups(). Returns the struct cleanup pointer | |
6423 | needed for later doing the cleanup. */ | |
6424 | ||
6425 | struct cleanup * | |
6426 | save_inferior_ptid (void) | |
6427 | { | |
6428 | ptid_t *saved_ptid_ptr; | |
6429 | ||
6430 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
6431 | *saved_ptid_ptr = inferior_ptid; | |
6432 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
6433 | } | |
c5aa993b | 6434 | \f |
488f131b | 6435 | |
b2175913 MS |
6436 | /* User interface for reverse debugging: |
6437 | Set exec-direction / show exec-direction commands | |
6438 | (returns error unless target implements to_set_exec_direction method). */ | |
6439 | ||
6440 | enum exec_direction_kind execution_direction = EXEC_FORWARD; | |
6441 | static const char exec_forward[] = "forward"; | |
6442 | static const char exec_reverse[] = "reverse"; | |
6443 | static const char *exec_direction = exec_forward; | |
6444 | static const char *exec_direction_names[] = { | |
6445 | exec_forward, | |
6446 | exec_reverse, | |
6447 | NULL | |
6448 | }; | |
6449 | ||
6450 | static void | |
6451 | set_exec_direction_func (char *args, int from_tty, | |
6452 | struct cmd_list_element *cmd) | |
6453 | { | |
6454 | if (target_can_execute_reverse) | |
6455 | { | |
6456 | if (!strcmp (exec_direction, exec_forward)) | |
6457 | execution_direction = EXEC_FORWARD; | |
6458 | else if (!strcmp (exec_direction, exec_reverse)) | |
6459 | execution_direction = EXEC_REVERSE; | |
6460 | } | |
8bbed405 MS |
6461 | else |
6462 | { | |
6463 | exec_direction = exec_forward; | |
6464 | error (_("Target does not support this operation.")); | |
6465 | } | |
b2175913 MS |
6466 | } |
6467 | ||
6468 | static void | |
6469 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
6470 | struct cmd_list_element *cmd, const char *value) | |
6471 | { | |
6472 | switch (execution_direction) { | |
6473 | case EXEC_FORWARD: | |
6474 | fprintf_filtered (out, _("Forward.\n")); | |
6475 | break; | |
6476 | case EXEC_REVERSE: | |
6477 | fprintf_filtered (out, _("Reverse.\n")); | |
6478 | break; | |
6479 | case EXEC_ERROR: | |
6480 | default: | |
6481 | fprintf_filtered (out, | |
6482 | _("Forward (target `%s' does not support exec-direction).\n"), | |
6483 | target_shortname); | |
6484 | break; | |
6485 | } | |
6486 | } | |
6487 | ||
6488 | /* User interface for non-stop mode. */ | |
6489 | ||
ad52ddc6 | 6490 | int non_stop = 0; |
ad52ddc6 PA |
6491 | |
6492 | static void | |
6493 | set_non_stop (char *args, int from_tty, | |
6494 | struct cmd_list_element *c) | |
6495 | { | |
6496 | if (target_has_execution) | |
6497 | { | |
6498 | non_stop_1 = non_stop; | |
6499 | error (_("Cannot change this setting while the inferior is running.")); | |
6500 | } | |
6501 | ||
6502 | non_stop = non_stop_1; | |
6503 | } | |
6504 | ||
6505 | static void | |
6506 | show_non_stop (struct ui_file *file, int from_tty, | |
6507 | struct cmd_list_element *c, const char *value) | |
6508 | { | |
6509 | fprintf_filtered (file, | |
6510 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
6511 | value); | |
6512 | } | |
6513 | ||
d4db2f36 PA |
6514 | static void |
6515 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
6516 | struct cmd_list_element *c, const char *value) | |
6517 | { | |
6518 | fprintf_filtered (file, _("\ | |
6519 | Resuming the execution of threads of all processes is %s.\n"), value); | |
6520 | } | |
ad52ddc6 | 6521 | |
c906108c | 6522 | void |
96baa820 | 6523 | _initialize_infrun (void) |
c906108c | 6524 | { |
52f0bd74 AC |
6525 | int i; |
6526 | int numsigs; | |
c906108c | 6527 | |
1bedd215 AC |
6528 | add_info ("signals", signals_info, _("\ |
6529 | What debugger does when program gets various signals.\n\ | |
6530 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
6531 | add_info_alias ("handle", "signals", 0); |
6532 | ||
1bedd215 AC |
6533 | add_com ("handle", class_run, handle_command, _("\ |
6534 | Specify how to handle a signal.\n\ | |
c906108c SS |
6535 | Args are signals and actions to apply to those signals.\n\ |
6536 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
6537 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
6538 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
6539 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
6540 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
6541 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
c906108c SS |
6542 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
6543 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
6544 | Print means print a message if this signal happens.\n\ | |
6545 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
6546 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 6547 | Pass and Stop may be combined.")); |
c906108c SS |
6548 | if (xdb_commands) |
6549 | { | |
1bedd215 AC |
6550 | add_com ("lz", class_info, signals_info, _("\ |
6551 | What debugger does when program gets various signals.\n\ | |
6552 | Specify a signal as argument to print info on that signal only.")); | |
6553 | add_com ("z", class_run, xdb_handle_command, _("\ | |
6554 | Specify how to handle a signal.\n\ | |
c906108c SS |
6555 | Args are signals and actions to apply to those signals.\n\ |
6556 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
6557 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
6558 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
6559 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 6560 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
cce7e648 | 6561 | Recognized actions include \"s\" (toggles between stop and nostop),\n\ |
c906108c SS |
6562 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
6563 | nopass), \"Q\" (noprint)\n\ | |
6564 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
6565 | Print means print a message if this signal happens.\n\ | |
6566 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
6567 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 6568 | Pass and Stop may be combined.")); |
c906108c SS |
6569 | } |
6570 | ||
6571 | if (!dbx_commands) | |
1a966eab AC |
6572 | stop_command = add_cmd ("stop", class_obscure, |
6573 | not_just_help_class_command, _("\ | |
6574 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 6575 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 6576 | of the program stops."), &cmdlist); |
c906108c | 6577 | |
85c07804 AC |
6578 | add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
6579 | Set inferior debugging."), _("\ | |
6580 | Show inferior debugging."), _("\ | |
6581 | When non-zero, inferior specific debugging is enabled."), | |
6582 | NULL, | |
920d2a44 | 6583 | show_debug_infrun, |
85c07804 | 6584 | &setdebuglist, &showdebuglist); |
527159b7 | 6585 | |
237fc4c9 PA |
6586 | add_setshow_boolean_cmd ("displaced", class_maintenance, &debug_displaced, _("\ |
6587 | Set displaced stepping debugging."), _("\ | |
6588 | Show displaced stepping debugging."), _("\ | |
6589 | When non-zero, displaced stepping specific debugging is enabled."), | |
6590 | NULL, | |
6591 | show_debug_displaced, | |
6592 | &setdebuglist, &showdebuglist); | |
6593 | ||
ad52ddc6 PA |
6594 | add_setshow_boolean_cmd ("non-stop", no_class, |
6595 | &non_stop_1, _("\ | |
6596 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
6597 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
6598 | When debugging a multi-threaded program and this setting is\n\ | |
6599 | off (the default, also called all-stop mode), when one thread stops\n\ | |
6600 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
6601 | all other threads in the program while you interact with the thread of\n\ | |
6602 | interest. When you continue or step a thread, you can allow the other\n\ | |
6603 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
6604 | thread's state, all threads stop.\n\ | |
6605 | \n\ | |
6606 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
6607 | to run freely. You'll be able to step each thread independently,\n\ | |
6608 | leave it stopped or free to run as needed."), | |
6609 | set_non_stop, | |
6610 | show_non_stop, | |
6611 | &setlist, | |
6612 | &showlist); | |
6613 | ||
c906108c | 6614 | numsigs = (int) TARGET_SIGNAL_LAST; |
488f131b | 6615 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
6616 | signal_print = (unsigned char *) |
6617 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
6618 | signal_program = (unsigned char *) | |
6619 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
6620 | for (i = 0; i < numsigs; i++) | |
6621 | { | |
6622 | signal_stop[i] = 1; | |
6623 | signal_print[i] = 1; | |
6624 | signal_program[i] = 1; | |
6625 | } | |
6626 | ||
6627 | /* Signals caused by debugger's own actions | |
6628 | should not be given to the program afterwards. */ | |
6629 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
6630 | signal_program[TARGET_SIGNAL_INT] = 0; | |
6631 | ||
6632 | /* Signals that are not errors should not normally enter the debugger. */ | |
6633 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
6634 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
6635 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
6636 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
6637 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
6638 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
6639 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
6640 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
6641 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
6642 | signal_print[TARGET_SIGNAL_IO] = 0; | |
6643 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
6644 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
6645 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
6646 | signal_print[TARGET_SIGNAL_URG] = 0; | |
6647 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
6648 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
6649 | ||
cd0fc7c3 SS |
6650 | /* These signals are used internally by user-level thread |
6651 | implementations. (See signal(5) on Solaris.) Like the above | |
6652 | signals, a healthy program receives and handles them as part of | |
6653 | its normal operation. */ | |
6654 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
6655 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
6656 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
6657 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
6658 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
6659 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
6660 | ||
85c07804 AC |
6661 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
6662 | &stop_on_solib_events, _("\ | |
6663 | Set stopping for shared library events."), _("\ | |
6664 | Show stopping for shared library events."), _("\ | |
c906108c SS |
6665 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
6666 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 AC |
6667 | to the user would be loading/unloading of a new library."), |
6668 | NULL, | |
920d2a44 | 6669 | show_stop_on_solib_events, |
85c07804 | 6670 | &setlist, &showlist); |
c906108c | 6671 | |
7ab04401 AC |
6672 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
6673 | follow_fork_mode_kind_names, | |
6674 | &follow_fork_mode_string, _("\ | |
6675 | Set debugger response to a program call of fork or vfork."), _("\ | |
6676 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
6677 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
6678 | parent - the original process is debugged after a fork\n\ | |
6679 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 6680 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
6681 | By default, the debugger will follow the parent process."), |
6682 | NULL, | |
920d2a44 | 6683 | show_follow_fork_mode_string, |
7ab04401 AC |
6684 | &setlist, &showlist); |
6685 | ||
6c95b8df PA |
6686 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
6687 | follow_exec_mode_names, | |
6688 | &follow_exec_mode_string, _("\ | |
6689 | Set debugger response to a program call of exec."), _("\ | |
6690 | Show debugger response to a program call of exec."), _("\ | |
6691 | An exec call replaces the program image of a process.\n\ | |
6692 | \n\ | |
6693 | follow-exec-mode can be:\n\ | |
6694 | \n\ | |
cce7e648 | 6695 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
6696 | to this new inferior. The program the process was running before\n\ |
6697 | the exec call can be restarted afterwards by restarting the original\n\ | |
6698 | inferior.\n\ | |
6699 | \n\ | |
6700 | same - the debugger keeps the process bound to the same inferior.\n\ | |
6701 | The new executable image replaces the previous executable loaded in\n\ | |
6702 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
6703 | the executable the process was running after the exec call.\n\ | |
6704 | \n\ | |
6705 | By default, the debugger will use the same inferior."), | |
6706 | NULL, | |
6707 | show_follow_exec_mode_string, | |
6708 | &setlist, &showlist); | |
6709 | ||
7ab04401 AC |
6710 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
6711 | scheduler_enums, &scheduler_mode, _("\ | |
6712 | Set mode for locking scheduler during execution."), _("\ | |
6713 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
6714 | off == no locking (threads may preempt at any time)\n\ |
6715 | on == full locking (no thread except the current thread may run)\n\ | |
6716 | step == scheduler locked during every single-step operation.\n\ | |
6717 | In this mode, no other thread may run during a step command.\n\ | |
7ab04401 AC |
6718 | Other threads may run while stepping over a function call ('next')."), |
6719 | set_schedlock_func, /* traps on target vector */ | |
920d2a44 | 6720 | show_scheduler_mode, |
7ab04401 | 6721 | &setlist, &showlist); |
5fbbeb29 | 6722 | |
d4db2f36 PA |
6723 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
6724 | Set mode for resuming threads of all processes."), _("\ | |
6725 | Show mode for resuming threads of all processes."), _("\ | |
6726 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
6727 | threads of all processes. When off (which is the default), execution\n\ | |
6728 | commands only resume the threads of the current process. The set of\n\ | |
6729 | threads that are resumed is further refined by the scheduler-locking\n\ | |
6730 | mode (see help set scheduler-locking)."), | |
6731 | NULL, | |
6732 | show_schedule_multiple, | |
6733 | &setlist, &showlist); | |
6734 | ||
5bf193a2 AC |
6735 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
6736 | Set mode of the step operation."), _("\ | |
6737 | Show mode of the step operation."), _("\ | |
6738 | When set, doing a step over a function without debug line information\n\ | |
6739 | will stop at the first instruction of that function. Otherwise, the\n\ | |
6740 | function is skipped and the step command stops at a different source line."), | |
6741 | NULL, | |
920d2a44 | 6742 | show_step_stop_if_no_debug, |
5bf193a2 | 6743 | &setlist, &showlist); |
ca6724c1 | 6744 | |
fff08868 HZ |
6745 | add_setshow_enum_cmd ("displaced-stepping", class_run, |
6746 | can_use_displaced_stepping_enum, | |
6747 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
6748 | Set debugger's willingness to use displaced stepping."), _("\ |
6749 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
6750 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
6751 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
6752 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
6753 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
6754 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
6755 | use it in all-stop mode (see help set non-stop)."), | |
6756 | NULL, | |
6757 | show_can_use_displaced_stepping, | |
6758 | &setlist, &showlist); | |
237fc4c9 | 6759 | |
b2175913 MS |
6760 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
6761 | &exec_direction, _("Set direction of execution.\n\ | |
6762 | Options are 'forward' or 'reverse'."), | |
6763 | _("Show direction of execution (forward/reverse)."), | |
6764 | _("Tells gdb whether to execute forward or backward."), | |
6765 | set_exec_direction_func, show_exec_direction_func, | |
6766 | &setlist, &showlist); | |
6767 | ||
6c95b8df PA |
6768 | /* Set/show detach-on-fork: user-settable mode. */ |
6769 | ||
6770 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
6771 | Set whether gdb will detach the child of a fork."), _("\ | |
6772 | Show whether gdb will detach the child of a fork."), _("\ | |
6773 | Tells gdb whether to detach the child of a fork."), | |
6774 | NULL, NULL, &setlist, &showlist); | |
6775 | ||
ca6724c1 KB |
6776 | /* ptid initializations */ |
6777 | null_ptid = ptid_build (0, 0, 0); | |
6778 | minus_one_ptid = ptid_build (-1, 0, 0); | |
6779 | inferior_ptid = null_ptid; | |
6780 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd PA |
6781 | |
6782 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 6783 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 6784 | observer_attach_thread_exit (infrun_thread_thread_exit); |
fc1cf338 | 6785 | observer_attach_inferior_exit (infrun_inferior_exit); |
4aa995e1 PA |
6786 | |
6787 | /* Explicitly create without lookup, since that tries to create a | |
6788 | value with a void typed value, and when we get here, gdbarch | |
6789 | isn't initialized yet. At this point, we're quite sure there | |
6790 | isn't another convenience variable of the same name. */ | |
6791 | create_internalvar_type_lazy ("_siginfo", siginfo_make_value); | |
d914c394 SS |
6792 | |
6793 | add_setshow_boolean_cmd ("observer", no_class, | |
6794 | &observer_mode_1, _("\ | |
6795 | Set whether gdb controls the inferior in observer mode."), _("\ | |
6796 | Show whether gdb controls the inferior in observer mode."), _("\ | |
6797 | In observer mode, GDB can get data from the inferior, but not\n\ | |
6798 | affect its execution. Registers and memory may not be changed,\n\ | |
6799 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
6800 | or signalled."), | |
6801 | set_observer_mode, | |
6802 | show_observer_mode, | |
6803 | &setlist, | |
6804 | &showlist); | |
c906108c | 6805 | } |