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 | |
96baa820 | 86 | void _initialize_infrun (void); |
43ff13b4 | 87 | |
e58b0e63 PA |
88 | void nullify_last_target_wait_ptid (void); |
89 | ||
5fbbeb29 CF |
90 | /* When set, stop the 'step' command if we enter a function which has |
91 | no line number information. The normal behavior is that we step | |
92 | over such function. */ | |
93 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
94 | static void |
95 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
96 | struct cmd_list_element *c, const char *value) | |
97 | { | |
98 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
99 | } | |
5fbbeb29 | 100 | |
43ff13b4 | 101 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 102 | |
43ff13b4 JM |
103 | int sync_execution = 0; |
104 | ||
c906108c SS |
105 | /* wait_for_inferior and normal_stop use this to notify the user |
106 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
107 | running in. */ |
108 | ||
39f77062 | 109 | static ptid_t previous_inferior_ptid; |
7a292a7a | 110 | |
6c95b8df PA |
111 | /* Default behavior is to detach newly forked processes (legacy). */ |
112 | int detach_fork = 1; | |
113 | ||
237fc4c9 PA |
114 | int debug_displaced = 0; |
115 | static void | |
116 | show_debug_displaced (struct ui_file *file, int from_tty, | |
117 | struct cmd_list_element *c, const char *value) | |
118 | { | |
119 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
120 | } | |
121 | ||
628fe4e4 | 122 | int debug_infrun = 0; |
920d2a44 AC |
123 | static void |
124 | show_debug_infrun (struct ui_file *file, int from_tty, | |
125 | struct cmd_list_element *c, const char *value) | |
126 | { | |
127 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
128 | } | |
527159b7 | 129 | |
d4f3574e SS |
130 | /* If the program uses ELF-style shared libraries, then calls to |
131 | functions in shared libraries go through stubs, which live in a | |
132 | table called the PLT (Procedure Linkage Table). The first time the | |
133 | function is called, the stub sends control to the dynamic linker, | |
134 | which looks up the function's real address, patches the stub so | |
135 | that future calls will go directly to the function, and then passes | |
136 | control to the function. | |
137 | ||
138 | If we are stepping at the source level, we don't want to see any of | |
139 | this --- we just want to skip over the stub and the dynamic linker. | |
140 | The simple approach is to single-step until control leaves the | |
141 | dynamic linker. | |
142 | ||
ca557f44 AC |
143 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
144 | dynamic linker calls functions in the shared C library, so you | |
145 | can't tell from the PC alone whether the dynamic linker is still | |
146 | running. In this case, we use a step-resume breakpoint to get us | |
147 | past the dynamic linker, as if we were using "next" to step over a | |
148 | function call. | |
d4f3574e | 149 | |
cfd8ab24 | 150 | in_solib_dynsym_resolve_code() says whether we're in the dynamic |
d4f3574e SS |
151 | linker code or not. Normally, this means we single-step. However, |
152 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
153 | address where we can place a step-resume breakpoint to get past the | |
154 | linker's symbol resolution function. | |
155 | ||
cfd8ab24 | 156 | in_solib_dynsym_resolve_code() can generally be implemented in a |
d4f3574e SS |
157 | pretty portable way, by comparing the PC against the address ranges |
158 | of the dynamic linker's sections. | |
159 | ||
160 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
161 | it depends on internal details of the dynamic linker. It's usually | |
162 | not too hard to figure out where to put a breakpoint, but it | |
163 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
164 | sanity checking. If it can't figure things out, returning zero and | |
165 | getting the (possibly confusing) stepping behavior is better than | |
166 | signalling an error, which will obscure the change in the | |
167 | inferior's state. */ | |
c906108c | 168 | |
c906108c SS |
169 | /* This function returns TRUE if pc is the address of an instruction |
170 | that lies within the dynamic linker (such as the event hook, or the | |
171 | dld itself). | |
172 | ||
173 | This function must be used only when a dynamic linker event has | |
174 | been caught, and the inferior is being stepped out of the hook, or | |
175 | undefined results are guaranteed. */ | |
176 | ||
177 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
178 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
179 | #endif | |
180 | ||
d914c394 SS |
181 | /* "Observer mode" is somewhat like a more extreme version of |
182 | non-stop, in which all GDB operations that might affect the | |
183 | target's execution have been disabled. */ | |
184 | ||
185 | static int non_stop_1 = 0; | |
186 | ||
187 | int observer_mode = 0; | |
188 | static int observer_mode_1 = 0; | |
189 | ||
190 | static void | |
191 | set_observer_mode (char *args, int from_tty, | |
192 | struct cmd_list_element *c) | |
193 | { | |
194 | extern int pagination_enabled; | |
195 | ||
196 | if (target_has_execution) | |
197 | { | |
198 | observer_mode_1 = observer_mode; | |
199 | error (_("Cannot change this setting while the inferior is running.")); | |
200 | } | |
201 | ||
202 | observer_mode = observer_mode_1; | |
203 | ||
204 | may_write_registers = !observer_mode; | |
205 | may_write_memory = !observer_mode; | |
206 | may_insert_breakpoints = !observer_mode; | |
207 | may_insert_tracepoints = !observer_mode; | |
208 | /* We can insert fast tracepoints in or out of observer mode, | |
209 | but enable them if we're going into this mode. */ | |
210 | if (observer_mode) | |
211 | may_insert_fast_tracepoints = 1; | |
212 | may_stop = !observer_mode; | |
213 | update_target_permissions (); | |
214 | ||
215 | /* Going *into* observer mode we must force non-stop, then | |
216 | going out we leave it that way. */ | |
217 | if (observer_mode) | |
218 | { | |
219 | target_async_permitted = 1; | |
220 | pagination_enabled = 0; | |
221 | non_stop = non_stop_1 = 1; | |
222 | } | |
223 | ||
224 | if (from_tty) | |
225 | printf_filtered (_("Observer mode is now %s.\n"), | |
226 | (observer_mode ? "on" : "off")); | |
227 | } | |
228 | ||
229 | static void | |
230 | show_observer_mode (struct ui_file *file, int from_tty, | |
231 | struct cmd_list_element *c, const char *value) | |
232 | { | |
233 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
234 | } | |
235 | ||
236 | /* This updates the value of observer mode based on changes in | |
237 | permissions. Note that we are deliberately ignoring the values of | |
238 | may-write-registers and may-write-memory, since the user may have | |
239 | reason to enable these during a session, for instance to turn on a | |
240 | debugging-related global. */ | |
241 | ||
242 | void | |
243 | update_observer_mode (void) | |
244 | { | |
245 | int newval; | |
246 | ||
247 | newval = (!may_insert_breakpoints | |
248 | && !may_insert_tracepoints | |
249 | && may_insert_fast_tracepoints | |
250 | && !may_stop | |
251 | && non_stop); | |
252 | ||
253 | /* Let the user know if things change. */ | |
254 | if (newval != observer_mode) | |
255 | printf_filtered (_("Observer mode is now %s.\n"), | |
256 | (newval ? "on" : "off")); | |
257 | ||
258 | observer_mode = observer_mode_1 = newval; | |
259 | } | |
c2c6d25f | 260 | |
c906108c SS |
261 | /* Tables of how to react to signals; the user sets them. */ |
262 | ||
263 | static unsigned char *signal_stop; | |
264 | static unsigned char *signal_print; | |
265 | static unsigned char *signal_program; | |
266 | ||
267 | #define SET_SIGS(nsigs,sigs,flags) \ | |
268 | do { \ | |
269 | int signum = (nsigs); \ | |
270 | while (signum-- > 0) \ | |
271 | if ((sigs)[signum]) \ | |
272 | (flags)[signum] = 1; \ | |
273 | } while (0) | |
274 | ||
275 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
276 | do { \ | |
277 | int signum = (nsigs); \ | |
278 | while (signum-- > 0) \ | |
279 | if ((sigs)[signum]) \ | |
280 | (flags)[signum] = 0; \ | |
281 | } while (0) | |
282 | ||
39f77062 KB |
283 | /* Value to pass to target_resume() to cause all threads to resume */ |
284 | ||
edb3359d | 285 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
286 | |
287 | /* Command list pointer for the "stop" placeholder. */ | |
288 | ||
289 | static struct cmd_list_element *stop_command; | |
290 | ||
c906108c SS |
291 | /* Function inferior was in as of last step command. */ |
292 | ||
293 | static struct symbol *step_start_function; | |
294 | ||
c906108c SS |
295 | /* Nonzero if we want to give control to the user when we're notified |
296 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 297 | int stop_on_solib_events; |
920d2a44 AC |
298 | static void |
299 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
300 | struct cmd_list_element *c, const char *value) | |
301 | { | |
302 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
303 | value); | |
304 | } | |
c906108c | 305 | |
c906108c SS |
306 | /* Nonzero means expecting a trace trap |
307 | and should stop the inferior and return silently when it happens. */ | |
308 | ||
309 | int stop_after_trap; | |
310 | ||
642fd101 DE |
311 | /* Save register contents here when executing a "finish" command or are |
312 | about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set. | |
c906108c SS |
313 | Thus this contains the return value from the called function (assuming |
314 | values are returned in a register). */ | |
315 | ||
72cec141 | 316 | struct regcache *stop_registers; |
c906108c | 317 | |
c906108c SS |
318 | /* Nonzero after stop if current stack frame should be printed. */ |
319 | ||
320 | static int stop_print_frame; | |
321 | ||
e02bc4cc | 322 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
323 | returned by target_wait()/deprecated_target_wait_hook(). This |
324 | information is returned by get_last_target_status(). */ | |
39f77062 | 325 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
326 | static struct target_waitstatus target_last_waitstatus; |
327 | ||
0d1e5fa7 PA |
328 | static void context_switch (ptid_t ptid); |
329 | ||
4e1c45ea | 330 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 PA |
331 | |
332 | void init_infwait_state (void); | |
a474d7c2 | 333 | |
53904c9e AC |
334 | static const char follow_fork_mode_child[] = "child"; |
335 | static const char follow_fork_mode_parent[] = "parent"; | |
336 | ||
488f131b | 337 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e AC |
338 | follow_fork_mode_child, |
339 | follow_fork_mode_parent, | |
340 | NULL | |
ef346e04 | 341 | }; |
c906108c | 342 | |
53904c9e | 343 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
344 | static void |
345 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
346 | struct cmd_list_element *c, const char *value) | |
347 | { | |
348 | fprintf_filtered (file, _("\ | |
349 | Debugger response to a program call of fork or vfork is \"%s\".\n"), | |
350 | value); | |
351 | } | |
c906108c SS |
352 | \f |
353 | ||
e58b0e63 PA |
354 | /* Tell the target to follow the fork we're stopped at. Returns true |
355 | if the inferior should be resumed; false, if the target for some | |
356 | reason decided it's best not to resume. */ | |
357 | ||
6604731b | 358 | static int |
4ef3f3be | 359 | follow_fork (void) |
c906108c | 360 | { |
ea1dd7bc | 361 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
362 | int should_resume = 1; |
363 | struct thread_info *tp; | |
364 | ||
365 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
366 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
367 | parent thread structure's run control related fields, not just these. |
368 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
369 | struct breakpoint *step_resume_breakpoint = NULL; | |
370 | CORE_ADDR step_range_start = 0; | |
371 | CORE_ADDR step_range_end = 0; | |
372 | struct frame_id step_frame_id = { 0 }; | |
e58b0e63 PA |
373 | |
374 | if (!non_stop) | |
375 | { | |
376 | ptid_t wait_ptid; | |
377 | struct target_waitstatus wait_status; | |
378 | ||
379 | /* Get the last target status returned by target_wait(). */ | |
380 | get_last_target_status (&wait_ptid, &wait_status); | |
381 | ||
382 | /* If not stopped at a fork event, then there's nothing else to | |
383 | do. */ | |
384 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
385 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
386 | return 1; | |
387 | ||
388 | /* Check if we switched over from WAIT_PTID, since the event was | |
389 | reported. */ | |
390 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
391 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
392 | { | |
393 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
394 | target to follow it (in either direction). We'll | |
395 | afterwards refuse to resume, and inform the user what | |
396 | happened. */ | |
397 | switch_to_thread (wait_ptid); | |
398 | should_resume = 0; | |
399 | } | |
400 | } | |
401 | ||
402 | tp = inferior_thread (); | |
403 | ||
404 | /* If there were any forks/vforks that were caught and are now to be | |
405 | followed, then do so now. */ | |
406 | switch (tp->pending_follow.kind) | |
407 | { | |
408 | case TARGET_WAITKIND_FORKED: | |
409 | case TARGET_WAITKIND_VFORKED: | |
410 | { | |
411 | ptid_t parent, child; | |
412 | ||
413 | /* If the user did a next/step, etc, over a fork call, | |
414 | preserve the stepping state in the fork child. */ | |
415 | if (follow_child && should_resume) | |
416 | { | |
417 | step_resume_breakpoint | |
418 | = clone_momentary_breakpoint (tp->step_resume_breakpoint); | |
419 | step_range_start = tp->step_range_start; | |
420 | step_range_end = tp->step_range_end; | |
421 | step_frame_id = tp->step_frame_id; | |
422 | ||
423 | /* For now, delete the parent's sr breakpoint, otherwise, | |
424 | parent/child sr breakpoints are considered duplicates, | |
425 | and the child version will not be installed. Remove | |
426 | this when the breakpoints module becomes aware of | |
427 | inferiors and address spaces. */ | |
428 | delete_step_resume_breakpoint (tp); | |
429 | tp->step_range_start = 0; | |
430 | tp->step_range_end = 0; | |
431 | tp->step_frame_id = null_frame_id; | |
432 | } | |
433 | ||
434 | parent = inferior_ptid; | |
435 | child = tp->pending_follow.value.related_pid; | |
436 | ||
437 | /* Tell the target to do whatever is necessary to follow | |
438 | either parent or child. */ | |
439 | if (target_follow_fork (follow_child)) | |
440 | { | |
441 | /* Target refused to follow, or there's some other reason | |
442 | we shouldn't resume. */ | |
443 | should_resume = 0; | |
444 | } | |
445 | else | |
446 | { | |
447 | /* This pending follow fork event is now handled, one way | |
448 | or another. The previous selected thread may be gone | |
449 | from the lists by now, but if it is still around, need | |
450 | to clear the pending follow request. */ | |
e09875d4 | 451 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
452 | if (tp) |
453 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
454 | ||
455 | /* This makes sure we don't try to apply the "Switched | |
456 | over from WAIT_PID" logic above. */ | |
457 | nullify_last_target_wait_ptid (); | |
458 | ||
459 | /* If we followed the child, switch to it... */ | |
460 | if (follow_child) | |
461 | { | |
462 | switch_to_thread (child); | |
463 | ||
464 | /* ... and preserve the stepping state, in case the | |
465 | user was stepping over the fork call. */ | |
466 | if (should_resume) | |
467 | { | |
468 | tp = inferior_thread (); | |
469 | tp->step_resume_breakpoint = step_resume_breakpoint; | |
470 | tp->step_range_start = step_range_start; | |
471 | tp->step_range_end = step_range_end; | |
472 | tp->step_frame_id = step_frame_id; | |
473 | } | |
474 | else | |
475 | { | |
476 | /* If we get here, it was because we're trying to | |
477 | resume from a fork catchpoint, but, the user | |
478 | has switched threads away from the thread that | |
479 | forked. In that case, the resume command | |
480 | issued is most likely not applicable to the | |
481 | child, so just warn, and refuse to resume. */ | |
482 | warning (_("\ | |
483 | Not resuming: switched threads before following fork child.\n")); | |
484 | } | |
485 | ||
486 | /* Reset breakpoints in the child as appropriate. */ | |
487 | follow_inferior_reset_breakpoints (); | |
488 | } | |
489 | else | |
490 | switch_to_thread (parent); | |
491 | } | |
492 | } | |
493 | break; | |
494 | case TARGET_WAITKIND_SPURIOUS: | |
495 | /* Nothing to follow. */ | |
496 | break; | |
497 | default: | |
498 | internal_error (__FILE__, __LINE__, | |
499 | "Unexpected pending_follow.kind %d\n", | |
500 | tp->pending_follow.kind); | |
501 | break; | |
502 | } | |
c906108c | 503 | |
e58b0e63 | 504 | return should_resume; |
c906108c SS |
505 | } |
506 | ||
6604731b DJ |
507 | void |
508 | follow_inferior_reset_breakpoints (void) | |
c906108c | 509 | { |
4e1c45ea PA |
510 | struct thread_info *tp = inferior_thread (); |
511 | ||
6604731b DJ |
512 | /* Was there a step_resume breakpoint? (There was if the user |
513 | did a "next" at the fork() call.) If so, explicitly reset its | |
514 | thread number. | |
515 | ||
516 | step_resumes are a form of bp that are made to be per-thread. | |
517 | Since we created the step_resume bp when the parent process | |
518 | was being debugged, and now are switching to the child process, | |
519 | from the breakpoint package's viewpoint, that's a switch of | |
520 | "threads". We must update the bp's notion of which thread | |
521 | it is for, or it'll be ignored when it triggers. */ | |
522 | ||
4e1c45ea PA |
523 | if (tp->step_resume_breakpoint) |
524 | breakpoint_re_set_thread (tp->step_resume_breakpoint); | |
6604731b DJ |
525 | |
526 | /* Reinsert all breakpoints in the child. The user may have set | |
527 | breakpoints after catching the fork, in which case those | |
528 | were never set in the child, but only in the parent. This makes | |
529 | sure the inserted breakpoints match the breakpoint list. */ | |
530 | ||
531 | breakpoint_re_set (); | |
532 | insert_breakpoints (); | |
c906108c | 533 | } |
c906108c | 534 | |
6c95b8df PA |
535 | /* The child has exited or execed: resume threads of the parent the |
536 | user wanted to be executing. */ | |
537 | ||
538 | static int | |
539 | proceed_after_vfork_done (struct thread_info *thread, | |
540 | void *arg) | |
541 | { | |
542 | int pid = * (int *) arg; | |
543 | ||
544 | if (ptid_get_pid (thread->ptid) == pid | |
545 | && is_running (thread->ptid) | |
546 | && !is_executing (thread->ptid) | |
547 | && !thread->stop_requested | |
548 | && thread->stop_signal == TARGET_SIGNAL_0) | |
549 | { | |
550 | if (debug_infrun) | |
551 | fprintf_unfiltered (gdb_stdlog, | |
552 | "infrun: resuming vfork parent thread %s\n", | |
553 | target_pid_to_str (thread->ptid)); | |
554 | ||
555 | switch_to_thread (thread->ptid); | |
556 | clear_proceed_status (); | |
557 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_DEFAULT, 0); | |
558 | } | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
563 | /* Called whenever we notice an exec or exit event, to handle | |
564 | detaching or resuming a vfork parent. */ | |
565 | ||
566 | static void | |
567 | handle_vfork_child_exec_or_exit (int exec) | |
568 | { | |
569 | struct inferior *inf = current_inferior (); | |
570 | ||
571 | if (inf->vfork_parent) | |
572 | { | |
573 | int resume_parent = -1; | |
574 | ||
575 | /* This exec or exit marks the end of the shared memory region | |
576 | between the parent and the child. If the user wanted to | |
577 | detach from the parent, now is the time. */ | |
578 | ||
579 | if (inf->vfork_parent->pending_detach) | |
580 | { | |
581 | struct thread_info *tp; | |
582 | struct cleanup *old_chain; | |
583 | struct program_space *pspace; | |
584 | struct address_space *aspace; | |
585 | ||
586 | /* follow-fork child, detach-on-fork on */ | |
587 | ||
588 | old_chain = make_cleanup_restore_current_thread (); | |
589 | ||
590 | /* We're letting loose of the parent. */ | |
591 | tp = any_live_thread_of_process (inf->vfork_parent->pid); | |
592 | switch_to_thread (tp->ptid); | |
593 | ||
594 | /* We're about to detach from the parent, which implicitly | |
595 | removes breakpoints from its address space. There's a | |
596 | catch here: we want to reuse the spaces for the child, | |
597 | but, parent/child are still sharing the pspace at this | |
598 | point, although the exec in reality makes the kernel give | |
599 | the child a fresh set of new pages. The problem here is | |
600 | that the breakpoints module being unaware of this, would | |
601 | likely chose the child process to write to the parent | |
602 | address space. Swapping the child temporarily away from | |
603 | the spaces has the desired effect. Yes, this is "sort | |
604 | of" a hack. */ | |
605 | ||
606 | pspace = inf->pspace; | |
607 | aspace = inf->aspace; | |
608 | inf->aspace = NULL; | |
609 | inf->pspace = NULL; | |
610 | ||
611 | if (debug_infrun || info_verbose) | |
612 | { | |
613 | target_terminal_ours (); | |
614 | ||
615 | if (exec) | |
616 | fprintf_filtered (gdb_stdlog, | |
617 | "Detaching vfork parent process %d after child exec.\n", | |
618 | inf->vfork_parent->pid); | |
619 | else | |
620 | fprintf_filtered (gdb_stdlog, | |
621 | "Detaching vfork parent process %d after child exit.\n", | |
622 | inf->vfork_parent->pid); | |
623 | } | |
624 | ||
625 | target_detach (NULL, 0); | |
626 | ||
627 | /* Put it back. */ | |
628 | inf->pspace = pspace; | |
629 | inf->aspace = aspace; | |
630 | ||
631 | do_cleanups (old_chain); | |
632 | } | |
633 | else if (exec) | |
634 | { | |
635 | /* We're staying attached to the parent, so, really give the | |
636 | child a new address space. */ | |
637 | inf->pspace = add_program_space (maybe_new_address_space ()); | |
638 | inf->aspace = inf->pspace->aspace; | |
639 | inf->removable = 1; | |
640 | set_current_program_space (inf->pspace); | |
641 | ||
642 | resume_parent = inf->vfork_parent->pid; | |
643 | ||
644 | /* Break the bonds. */ | |
645 | inf->vfork_parent->vfork_child = NULL; | |
646 | } | |
647 | else | |
648 | { | |
649 | struct cleanup *old_chain; | |
650 | struct program_space *pspace; | |
651 | ||
652 | /* If this is a vfork child exiting, then the pspace and | |
653 | aspaces were shared with the parent. Since we're | |
654 | reporting the process exit, we'll be mourning all that is | |
655 | found in the address space, and switching to null_ptid, | |
656 | preparing to start a new inferior. But, since we don't | |
657 | want to clobber the parent's address/program spaces, we | |
658 | go ahead and create a new one for this exiting | |
659 | inferior. */ | |
660 | ||
661 | /* Switch to null_ptid, so that clone_program_space doesn't want | |
662 | to read the selected frame of a dead process. */ | |
663 | old_chain = save_inferior_ptid (); | |
664 | inferior_ptid = null_ptid; | |
665 | ||
666 | /* This inferior is dead, so avoid giving the breakpoints | |
667 | module the option to write through to it (cloning a | |
668 | program space resets breakpoints). */ | |
669 | inf->aspace = NULL; | |
670 | inf->pspace = NULL; | |
671 | pspace = add_program_space (maybe_new_address_space ()); | |
672 | set_current_program_space (pspace); | |
673 | inf->removable = 1; | |
674 | clone_program_space (pspace, inf->vfork_parent->pspace); | |
675 | inf->pspace = pspace; | |
676 | inf->aspace = pspace->aspace; | |
677 | ||
678 | /* Put back inferior_ptid. We'll continue mourning this | |
679 | inferior. */ | |
680 | do_cleanups (old_chain); | |
681 | ||
682 | resume_parent = inf->vfork_parent->pid; | |
683 | /* Break the bonds. */ | |
684 | inf->vfork_parent->vfork_child = NULL; | |
685 | } | |
686 | ||
687 | inf->vfork_parent = NULL; | |
688 | ||
689 | gdb_assert (current_program_space == inf->pspace); | |
690 | ||
691 | if (non_stop && resume_parent != -1) | |
692 | { | |
693 | /* If the user wanted the parent to be running, let it go | |
694 | free now. */ | |
695 | struct cleanup *old_chain = make_cleanup_restore_current_thread (); | |
696 | ||
697 | if (debug_infrun) | |
698 | fprintf_unfiltered (gdb_stdlog, "infrun: resuming vfork parent process %d\n", | |
699 | resume_parent); | |
700 | ||
701 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
702 | ||
703 | do_cleanups (old_chain); | |
704 | } | |
705 | } | |
706 | } | |
707 | ||
708 | /* Enum strings for "set|show displaced-stepping". */ | |
709 | ||
710 | static const char follow_exec_mode_new[] = "new"; | |
711 | static const char follow_exec_mode_same[] = "same"; | |
712 | static const char *follow_exec_mode_names[] = | |
713 | { | |
714 | follow_exec_mode_new, | |
715 | follow_exec_mode_same, | |
716 | NULL, | |
717 | }; | |
718 | ||
719 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
720 | static void | |
721 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
722 | struct cmd_list_element *c, const char *value) | |
723 | { | |
724 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
725 | } | |
726 | ||
1adeb98a FN |
727 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
728 | ||
c906108c | 729 | static void |
3a3e9ee3 | 730 | follow_exec (ptid_t pid, char *execd_pathname) |
c906108c | 731 | { |
4e1c45ea | 732 | struct thread_info *th = inferior_thread (); |
6c95b8df | 733 | struct inferior *inf = current_inferior (); |
7a292a7a | 734 | |
c906108c SS |
735 | /* This is an exec event that we actually wish to pay attention to. |
736 | Refresh our symbol table to the newly exec'd program, remove any | |
737 | momentary bp's, etc. | |
738 | ||
739 | If there are breakpoints, they aren't really inserted now, | |
740 | since the exec() transformed our inferior into a fresh set | |
741 | of instructions. | |
742 | ||
743 | We want to preserve symbolic breakpoints on the list, since | |
744 | we have hopes that they can be reset after the new a.out's | |
745 | symbol table is read. | |
746 | ||
747 | However, any "raw" breakpoints must be removed from the list | |
748 | (e.g., the solib bp's), since their address is probably invalid | |
749 | now. | |
750 | ||
751 | And, we DON'T want to call delete_breakpoints() here, since | |
752 | that may write the bp's "shadow contents" (the instruction | |
753 | value that was overwritten witha TRAP instruction). Since | |
754 | we now have a new a.out, those shadow contents aren't valid. */ | |
6c95b8df PA |
755 | |
756 | mark_breakpoints_out (); | |
757 | ||
c906108c SS |
758 | update_breakpoints_after_exec (); |
759 | ||
760 | /* If there was one, it's gone now. We cannot truly step-to-next | |
761 | statement through an exec(). */ | |
4e1c45ea PA |
762 | th->step_resume_breakpoint = NULL; |
763 | th->step_range_start = 0; | |
764 | th->step_range_end = 0; | |
c906108c | 765 | |
a75724bc PA |
766 | /* The target reports the exec event to the main thread, even if |
767 | some other thread does the exec, and even if the main thread was | |
768 | already stopped --- if debugging in non-stop mode, it's possible | |
769 | the user had the main thread held stopped in the previous image | |
770 | --- release it now. This is the same behavior as step-over-exec | |
771 | with scheduler-locking on in all-stop mode. */ | |
772 | th->stop_requested = 0; | |
773 | ||
c906108c | 774 | /* What is this a.out's name? */ |
6c95b8df PA |
775 | printf_unfiltered (_("%s is executing new program: %s\n"), |
776 | target_pid_to_str (inferior_ptid), | |
777 | execd_pathname); | |
c906108c SS |
778 | |
779 | /* We've followed the inferior through an exec. Therefore, the | |
780 | inferior has essentially been killed & reborn. */ | |
7a292a7a | 781 | |
c906108c | 782 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
783 | |
784 | breakpoint_init_inferior (inf_execd); | |
e85a822c DJ |
785 | |
786 | if (gdb_sysroot && *gdb_sysroot) | |
787 | { | |
788 | char *name = alloca (strlen (gdb_sysroot) | |
789 | + strlen (execd_pathname) | |
790 | + 1); | |
abbb1732 | 791 | |
e85a822c DJ |
792 | strcpy (name, gdb_sysroot); |
793 | strcat (name, execd_pathname); | |
794 | execd_pathname = name; | |
795 | } | |
c906108c | 796 | |
cce9b6bf PA |
797 | /* Reset the shared library package. This ensures that we get a |
798 | shlib event when the child reaches "_start", at which point the | |
799 | dld will have had a chance to initialize the child. */ | |
800 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
801 | we don't want those to be satisfied by the libraries of the | |
802 | previous incarnation of this process. */ | |
803 | no_shared_libraries (NULL, 0); | |
804 | ||
6c95b8df PA |
805 | if (follow_exec_mode_string == follow_exec_mode_new) |
806 | { | |
807 | struct program_space *pspace; | |
6c95b8df PA |
808 | |
809 | /* The user wants to keep the old inferior and program spaces | |
810 | around. Create a new fresh one, and switch to it. */ | |
811 | ||
812 | inf = add_inferior (current_inferior ()->pid); | |
813 | pspace = add_program_space (maybe_new_address_space ()); | |
814 | inf->pspace = pspace; | |
815 | inf->aspace = pspace->aspace; | |
816 | ||
817 | exit_inferior_num_silent (current_inferior ()->num); | |
818 | ||
819 | set_current_inferior (inf); | |
820 | set_current_program_space (pspace); | |
821 | } | |
822 | ||
823 | gdb_assert (current_program_space == inf->pspace); | |
824 | ||
825 | /* That a.out is now the one to use. */ | |
826 | exec_file_attach (execd_pathname, 0); | |
827 | ||
cce9b6bf | 828 | /* Load the main file's symbols. */ |
1adeb98a | 829 | symbol_file_add_main (execd_pathname, 0); |
c906108c | 830 | |
7a292a7a | 831 | #ifdef SOLIB_CREATE_INFERIOR_HOOK |
39f77062 | 832 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
a77053c2 | 833 | #else |
268a4a75 | 834 | solib_create_inferior_hook (0); |
7a292a7a | 835 | #endif |
c906108c | 836 | |
4efc6507 DE |
837 | jit_inferior_created_hook (); |
838 | ||
c906108c SS |
839 | /* Reinsert all breakpoints. (Those which were symbolic have |
840 | been reset to the proper address in the new a.out, thanks | |
841 | to symbol_file_command...) */ | |
842 | insert_breakpoints (); | |
843 | ||
844 | /* The next resume of this inferior should bring it to the shlib | |
845 | startup breakpoints. (If the user had also set bp's on | |
846 | "main" from the old (parent) process, then they'll auto- | |
847 | matically get reset there in the new process.) */ | |
c906108c SS |
848 | } |
849 | ||
850 | /* Non-zero if we just simulating a single-step. This is needed | |
851 | because we cannot remove the breakpoints in the inferior process | |
852 | until after the `wait' in `wait_for_inferior'. */ | |
853 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
854 | |
855 | /* The thread we inserted single-step breakpoints for. */ | |
856 | static ptid_t singlestep_ptid; | |
857 | ||
fd48f117 DJ |
858 | /* PC when we started this single-step. */ |
859 | static CORE_ADDR singlestep_pc; | |
860 | ||
9f976b41 DJ |
861 | /* If another thread hit the singlestep breakpoint, we save the original |
862 | thread here so that we can resume single-stepping it later. */ | |
863 | static ptid_t saved_singlestep_ptid; | |
864 | static int stepping_past_singlestep_breakpoint; | |
6a6b96b9 | 865 | |
ca67fcb8 VP |
866 | /* If not equal to null_ptid, this means that after stepping over breakpoint |
867 | is finished, we need to switch to deferred_step_ptid, and step it. | |
868 | ||
869 | The use case is when one thread has hit a breakpoint, and then the user | |
870 | has switched to another thread and issued 'step'. We need to step over | |
871 | breakpoint in the thread which hit the breakpoint, but then continue | |
872 | stepping the thread user has selected. */ | |
873 | static ptid_t deferred_step_ptid; | |
c906108c | 874 | \f |
237fc4c9 PA |
875 | /* Displaced stepping. */ |
876 | ||
877 | /* In non-stop debugging mode, we must take special care to manage | |
878 | breakpoints properly; in particular, the traditional strategy for | |
879 | stepping a thread past a breakpoint it has hit is unsuitable. | |
880 | 'Displaced stepping' is a tactic for stepping one thread past a | |
881 | breakpoint it has hit while ensuring that other threads running | |
882 | concurrently will hit the breakpoint as they should. | |
883 | ||
884 | The traditional way to step a thread T off a breakpoint in a | |
885 | multi-threaded program in all-stop mode is as follows: | |
886 | ||
887 | a0) Initially, all threads are stopped, and breakpoints are not | |
888 | inserted. | |
889 | a1) We single-step T, leaving breakpoints uninserted. | |
890 | a2) We insert breakpoints, and resume all threads. | |
891 | ||
892 | In non-stop debugging, however, this strategy is unsuitable: we | |
893 | don't want to have to stop all threads in the system in order to | |
894 | continue or step T past a breakpoint. Instead, we use displaced | |
895 | stepping: | |
896 | ||
897 | n0) Initially, T is stopped, other threads are running, and | |
898 | breakpoints are inserted. | |
899 | n1) We copy the instruction "under" the breakpoint to a separate | |
900 | location, outside the main code stream, making any adjustments | |
901 | to the instruction, register, and memory state as directed by | |
902 | T's architecture. | |
903 | n2) We single-step T over the instruction at its new location. | |
904 | n3) We adjust the resulting register and memory state as directed | |
905 | by T's architecture. This includes resetting T's PC to point | |
906 | back into the main instruction stream. | |
907 | n4) We resume T. | |
908 | ||
909 | This approach depends on the following gdbarch methods: | |
910 | ||
911 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
912 | indicate where to copy the instruction, and how much space must | |
913 | be reserved there. We use these in step n1. | |
914 | ||
915 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
916 | address, and makes any necessary adjustments to the instruction, | |
917 | register contents, and memory. We use this in step n1. | |
918 | ||
919 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
920 | we have successfuly single-stepped the instruction, to yield the | |
921 | same effect the instruction would have had if we had executed it | |
922 | at its original address. We use this in step n3. | |
923 | ||
924 | - gdbarch_displaced_step_free_closure provides cleanup. | |
925 | ||
926 | The gdbarch_displaced_step_copy_insn and | |
927 | gdbarch_displaced_step_fixup functions must be written so that | |
928 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
929 | single-stepping across the copied instruction, and then applying | |
930 | gdbarch_displaced_insn_fixup should have the same effects on the | |
931 | thread's memory and registers as stepping the instruction in place | |
932 | would have. Exactly which responsibilities fall to the copy and | |
933 | which fall to the fixup is up to the author of those functions. | |
934 | ||
935 | See the comments in gdbarch.sh for details. | |
936 | ||
937 | Note that displaced stepping and software single-step cannot | |
938 | currently be used in combination, although with some care I think | |
939 | they could be made to. Software single-step works by placing | |
940 | breakpoints on all possible subsequent instructions; if the | |
941 | displaced instruction is a PC-relative jump, those breakpoints | |
942 | could fall in very strange places --- on pages that aren't | |
943 | executable, or at addresses that are not proper instruction | |
944 | boundaries. (We do generally let other threads run while we wait | |
945 | to hit the software single-step breakpoint, and they might | |
946 | encounter such a corrupted instruction.) One way to work around | |
947 | this would be to have gdbarch_displaced_step_copy_insn fully | |
948 | simulate the effect of PC-relative instructions (and return NULL) | |
949 | on architectures that use software single-stepping. | |
950 | ||
951 | In non-stop mode, we can have independent and simultaneous step | |
952 | requests, so more than one thread may need to simultaneously step | |
953 | over a breakpoint. The current implementation assumes there is | |
954 | only one scratch space per process. In this case, we have to | |
955 | serialize access to the scratch space. If thread A wants to step | |
956 | over a breakpoint, but we are currently waiting for some other | |
957 | thread to complete a displaced step, we leave thread A stopped and | |
958 | place it in the displaced_step_request_queue. Whenever a displaced | |
959 | step finishes, we pick the next thread in the queue and start a new | |
960 | displaced step operation on it. See displaced_step_prepare and | |
961 | displaced_step_fixup for details. */ | |
962 | ||
237fc4c9 PA |
963 | struct displaced_step_request |
964 | { | |
965 | ptid_t ptid; | |
966 | struct displaced_step_request *next; | |
967 | }; | |
968 | ||
fc1cf338 PA |
969 | /* Per-inferior displaced stepping state. */ |
970 | struct displaced_step_inferior_state | |
971 | { | |
972 | /* Pointer to next in linked list. */ | |
973 | struct displaced_step_inferior_state *next; | |
974 | ||
975 | /* The process this displaced step state refers to. */ | |
976 | int pid; | |
977 | ||
978 | /* A queue of pending displaced stepping requests. One entry per | |
979 | thread that needs to do a displaced step. */ | |
980 | struct displaced_step_request *step_request_queue; | |
981 | ||
982 | /* If this is not null_ptid, this is the thread carrying out a | |
983 | displaced single-step in process PID. This thread's state will | |
984 | require fixing up once it has completed its step. */ | |
985 | ptid_t step_ptid; | |
986 | ||
987 | /* The architecture the thread had when we stepped it. */ | |
988 | struct gdbarch *step_gdbarch; | |
989 | ||
990 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
991 | for post-step cleanup. */ | |
992 | struct displaced_step_closure *step_closure; | |
993 | ||
994 | /* The address of the original instruction, and the copy we | |
995 | made. */ | |
996 | CORE_ADDR step_original, step_copy; | |
997 | ||
998 | /* Saved contents of copy area. */ | |
999 | gdb_byte *step_saved_copy; | |
1000 | }; | |
1001 | ||
1002 | /* The list of states of processes involved in displaced stepping | |
1003 | presently. */ | |
1004 | static struct displaced_step_inferior_state *displaced_step_inferior_states; | |
1005 | ||
1006 | /* Get the displaced stepping state of process PID. */ | |
1007 | ||
1008 | static struct displaced_step_inferior_state * | |
1009 | get_displaced_stepping_state (int pid) | |
1010 | { | |
1011 | struct displaced_step_inferior_state *state; | |
1012 | ||
1013 | for (state = displaced_step_inferior_states; | |
1014 | state != NULL; | |
1015 | state = state->next) | |
1016 | if (state->pid == pid) | |
1017 | return state; | |
1018 | ||
1019 | return NULL; | |
1020 | } | |
1021 | ||
1022 | /* Add a new displaced stepping state for process PID to the displaced | |
1023 | stepping state list, or return a pointer to an already existing | |
1024 | entry, if it already exists. Never returns NULL. */ | |
1025 | ||
1026 | static struct displaced_step_inferior_state * | |
1027 | add_displaced_stepping_state (int pid) | |
1028 | { | |
1029 | struct displaced_step_inferior_state *state; | |
1030 | ||
1031 | for (state = displaced_step_inferior_states; | |
1032 | state != NULL; | |
1033 | state = state->next) | |
1034 | if (state->pid == pid) | |
1035 | return state; | |
237fc4c9 | 1036 | |
fc1cf338 PA |
1037 | state = xcalloc (1, sizeof (*state)); |
1038 | state->pid = pid; | |
1039 | state->next = displaced_step_inferior_states; | |
1040 | displaced_step_inferior_states = state; | |
237fc4c9 | 1041 | |
fc1cf338 PA |
1042 | return state; |
1043 | } | |
1044 | ||
1045 | /* Remove the displaced stepping state of process PID. */ | |
237fc4c9 | 1046 | |
fc1cf338 PA |
1047 | static void |
1048 | remove_displaced_stepping_state (int pid) | |
1049 | { | |
1050 | struct displaced_step_inferior_state *it, **prev_next_p; | |
237fc4c9 | 1051 | |
fc1cf338 PA |
1052 | gdb_assert (pid != 0); |
1053 | ||
1054 | it = displaced_step_inferior_states; | |
1055 | prev_next_p = &displaced_step_inferior_states; | |
1056 | while (it) | |
1057 | { | |
1058 | if (it->pid == pid) | |
1059 | { | |
1060 | *prev_next_p = it->next; | |
1061 | xfree (it); | |
1062 | return; | |
1063 | } | |
1064 | ||
1065 | prev_next_p = &it->next; | |
1066 | it = *prev_next_p; | |
1067 | } | |
1068 | } | |
1069 | ||
1070 | static void | |
1071 | infrun_inferior_exit (struct inferior *inf) | |
1072 | { | |
1073 | remove_displaced_stepping_state (inf->pid); | |
1074 | } | |
237fc4c9 | 1075 | |
fff08868 HZ |
1076 | /* Enum strings for "set|show displaced-stepping". */ |
1077 | ||
1078 | static const char can_use_displaced_stepping_auto[] = "auto"; | |
1079 | static const char can_use_displaced_stepping_on[] = "on"; | |
1080 | static const char can_use_displaced_stepping_off[] = "off"; | |
1081 | static const char *can_use_displaced_stepping_enum[] = | |
1082 | { | |
1083 | can_use_displaced_stepping_auto, | |
1084 | can_use_displaced_stepping_on, | |
1085 | can_use_displaced_stepping_off, | |
1086 | NULL, | |
1087 | }; | |
1088 | ||
1089 | /* If ON, and the architecture supports it, GDB will use displaced | |
1090 | stepping to step over breakpoints. If OFF, or if the architecture | |
1091 | doesn't support it, GDB will instead use the traditional | |
1092 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1093 | decide which technique to use to step over breakpoints depending on | |
1094 | which of all-stop or non-stop mode is active --- displaced stepping | |
1095 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1096 | ||
1097 | static const char *can_use_displaced_stepping = | |
1098 | can_use_displaced_stepping_auto; | |
1099 | ||
237fc4c9 PA |
1100 | static void |
1101 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1102 | struct cmd_list_element *c, | |
1103 | const char *value) | |
1104 | { | |
fff08868 HZ |
1105 | if (can_use_displaced_stepping == can_use_displaced_stepping_auto) |
1106 | fprintf_filtered (file, _("\ | |
1107 | Debugger's willingness to use displaced stepping to step over \ | |
1108 | breakpoints is %s (currently %s).\n"), | |
1109 | value, non_stop ? "on" : "off"); | |
1110 | else | |
1111 | fprintf_filtered (file, _("\ | |
1112 | Debugger's willingness to use displaced stepping to step over \ | |
1113 | breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1114 | } |
1115 | ||
fff08868 HZ |
1116 | /* Return non-zero if displaced stepping can/should be used to step |
1117 | over breakpoints. */ | |
1118 | ||
237fc4c9 PA |
1119 | static int |
1120 | use_displaced_stepping (struct gdbarch *gdbarch) | |
1121 | { | |
fff08868 HZ |
1122 | return (((can_use_displaced_stepping == can_use_displaced_stepping_auto |
1123 | && non_stop) | |
1124 | || can_use_displaced_stepping == can_use_displaced_stepping_on) | |
96429cc8 HZ |
1125 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
1126 | && !RECORD_IS_USED); | |
237fc4c9 PA |
1127 | } |
1128 | ||
1129 | /* Clean out any stray displaced stepping state. */ | |
1130 | static void | |
fc1cf338 | 1131 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1132 | { |
1133 | /* Indicate that there is no cleanup pending. */ | |
fc1cf338 | 1134 | displaced->step_ptid = null_ptid; |
237fc4c9 | 1135 | |
fc1cf338 | 1136 | if (displaced->step_closure) |
237fc4c9 | 1137 | { |
fc1cf338 PA |
1138 | gdbarch_displaced_step_free_closure (displaced->step_gdbarch, |
1139 | displaced->step_closure); | |
1140 | displaced->step_closure = NULL; | |
237fc4c9 PA |
1141 | } |
1142 | } | |
1143 | ||
1144 | static void | |
fc1cf338 | 1145 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1146 | { |
fc1cf338 PA |
1147 | struct displaced_step_inferior_state *state = arg; |
1148 | ||
1149 | displaced_step_clear (state); | |
237fc4c9 PA |
1150 | } |
1151 | ||
1152 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1153 | void | |
1154 | displaced_step_dump_bytes (struct ui_file *file, | |
1155 | const gdb_byte *buf, | |
1156 | size_t len) | |
1157 | { | |
1158 | int i; | |
1159 | ||
1160 | for (i = 0; i < len; i++) | |
1161 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1162 | fputs_unfiltered ("\n", file); | |
1163 | } | |
1164 | ||
1165 | /* Prepare to single-step, using displaced stepping. | |
1166 | ||
1167 | Note that we cannot use displaced stepping when we have a signal to | |
1168 | deliver. If we have a signal to deliver and an instruction to step | |
1169 | over, then after the step, there will be no indication from the | |
1170 | target whether the thread entered a signal handler or ignored the | |
1171 | signal and stepped over the instruction successfully --- both cases | |
1172 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1173 | fixup, and in the second case we must --- but we can't tell which. | |
1174 | Comments in the code for 'random signals' in handle_inferior_event | |
1175 | explain how we handle this case instead. | |
1176 | ||
1177 | Returns 1 if preparing was successful -- this thread is going to be | |
1178 | stepped now; or 0 if displaced stepping this thread got queued. */ | |
1179 | static int | |
1180 | displaced_step_prepare (ptid_t ptid) | |
1181 | { | |
ad53cd71 | 1182 | struct cleanup *old_cleanups, *ignore_cleanups; |
237fc4c9 PA |
1183 | struct regcache *regcache = get_thread_regcache (ptid); |
1184 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1185 | CORE_ADDR original, copy; | |
1186 | ULONGEST len; | |
1187 | struct displaced_step_closure *closure; | |
fc1cf338 | 1188 | struct displaced_step_inferior_state *displaced; |
237fc4c9 PA |
1189 | |
1190 | /* We should never reach this function if the architecture does not | |
1191 | support displaced stepping. */ | |
1192 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1193 | ||
fc1cf338 PA |
1194 | /* We have to displaced step one thread at a time, as we only have |
1195 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1196 | |
fc1cf338 PA |
1197 | displaced = add_displaced_stepping_state (ptid_get_pid (ptid)); |
1198 | ||
1199 | if (!ptid_equal (displaced->step_ptid, null_ptid)) | |
237fc4c9 PA |
1200 | { |
1201 | /* Already waiting for a displaced step to finish. Defer this | |
1202 | request and place in queue. */ | |
1203 | struct displaced_step_request *req, *new_req; | |
1204 | ||
1205 | if (debug_displaced) | |
1206 | fprintf_unfiltered (gdb_stdlog, | |
1207 | "displaced: defering step of %s\n", | |
1208 | target_pid_to_str (ptid)); | |
1209 | ||
1210 | new_req = xmalloc (sizeof (*new_req)); | |
1211 | new_req->ptid = ptid; | |
1212 | new_req->next = NULL; | |
1213 | ||
fc1cf338 | 1214 | if (displaced->step_request_queue) |
237fc4c9 | 1215 | { |
fc1cf338 | 1216 | for (req = displaced->step_request_queue; |
237fc4c9 PA |
1217 | req && req->next; |
1218 | req = req->next) | |
1219 | ; | |
1220 | req->next = new_req; | |
1221 | } | |
1222 | else | |
fc1cf338 | 1223 | displaced->step_request_queue = new_req; |
237fc4c9 PA |
1224 | |
1225 | return 0; | |
1226 | } | |
1227 | else | |
1228 | { | |
1229 | if (debug_displaced) | |
1230 | fprintf_unfiltered (gdb_stdlog, | |
1231 | "displaced: stepping %s now\n", | |
1232 | target_pid_to_str (ptid)); | |
1233 | } | |
1234 | ||
fc1cf338 | 1235 | displaced_step_clear (displaced); |
237fc4c9 | 1236 | |
ad53cd71 PA |
1237 | old_cleanups = save_inferior_ptid (); |
1238 | inferior_ptid = ptid; | |
1239 | ||
515630c5 | 1240 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1241 | |
1242 | copy = gdbarch_displaced_step_location (gdbarch); | |
1243 | len = gdbarch_max_insn_length (gdbarch); | |
1244 | ||
1245 | /* Save the original contents of the copy area. */ | |
fc1cf338 | 1246 | displaced->step_saved_copy = xmalloc (len); |
ad53cd71 | 1247 | ignore_cleanups = make_cleanup (free_current_contents, |
fc1cf338 PA |
1248 | &displaced->step_saved_copy); |
1249 | read_memory (copy, displaced->step_saved_copy, len); | |
237fc4c9 PA |
1250 | if (debug_displaced) |
1251 | { | |
5af949e3 UW |
1252 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1253 | paddress (gdbarch, copy)); | |
fc1cf338 PA |
1254 | displaced_step_dump_bytes (gdb_stdlog, |
1255 | displaced->step_saved_copy, | |
1256 | len); | |
237fc4c9 PA |
1257 | }; |
1258 | ||
1259 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1260 | original, copy, regcache); |
237fc4c9 PA |
1261 | |
1262 | /* We don't support the fully-simulated case at present. */ | |
1263 | gdb_assert (closure); | |
1264 | ||
9f5a595d UW |
1265 | /* Save the information we need to fix things up if the step |
1266 | succeeds. */ | |
fc1cf338 PA |
1267 | displaced->step_ptid = ptid; |
1268 | displaced->step_gdbarch = gdbarch; | |
1269 | displaced->step_closure = closure; | |
1270 | displaced->step_original = original; | |
1271 | displaced->step_copy = copy; | |
9f5a595d | 1272 | |
fc1cf338 | 1273 | make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1274 | |
1275 | /* Resume execution at the copy. */ | |
515630c5 | 1276 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1277 | |
ad53cd71 PA |
1278 | discard_cleanups (ignore_cleanups); |
1279 | ||
1280 | do_cleanups (old_cleanups); | |
237fc4c9 PA |
1281 | |
1282 | if (debug_displaced) | |
5af949e3 UW |
1283 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1284 | paddress (gdbarch, copy)); | |
237fc4c9 | 1285 | |
237fc4c9 PA |
1286 | return 1; |
1287 | } | |
1288 | ||
237fc4c9 PA |
1289 | static void |
1290 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, const gdb_byte *myaddr, int len) | |
1291 | { | |
1292 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
abbb1732 | 1293 | |
237fc4c9 PA |
1294 | inferior_ptid = ptid; |
1295 | write_memory (memaddr, myaddr, len); | |
1296 | do_cleanups (ptid_cleanup); | |
1297 | } | |
1298 | ||
1299 | static void | |
1300 | displaced_step_fixup (ptid_t event_ptid, enum target_signal signal) | |
1301 | { | |
1302 | struct cleanup *old_cleanups; | |
fc1cf338 PA |
1303 | struct displaced_step_inferior_state *displaced |
1304 | = get_displaced_stepping_state (ptid_get_pid (event_ptid)); | |
1305 | ||
1306 | /* Was any thread of this process doing a displaced step? */ | |
1307 | if (displaced == NULL) | |
1308 | return; | |
237fc4c9 PA |
1309 | |
1310 | /* Was this event for the pid we displaced? */ | |
fc1cf338 PA |
1311 | if (ptid_equal (displaced->step_ptid, null_ptid) |
1312 | || ! ptid_equal (displaced->step_ptid, event_ptid)) | |
237fc4c9 PA |
1313 | return; |
1314 | ||
fc1cf338 | 1315 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1316 | |
1317 | /* Restore the contents of the copy area. */ | |
1318 | { | |
fc1cf338 | 1319 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); |
abbb1732 | 1320 | |
fc1cf338 PA |
1321 | write_memory_ptid (displaced->step_ptid, displaced->step_copy, |
1322 | displaced->step_saved_copy, len); | |
237fc4c9 | 1323 | if (debug_displaced) |
5af949e3 | 1324 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s\n", |
fc1cf338 PA |
1325 | paddress (displaced->step_gdbarch, |
1326 | displaced->step_copy)); | |
237fc4c9 PA |
1327 | } |
1328 | ||
1329 | /* Did the instruction complete successfully? */ | |
1330 | if (signal == TARGET_SIGNAL_TRAP) | |
1331 | { | |
1332 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
1333 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
1334 | displaced->step_closure, | |
1335 | displaced->step_original, | |
1336 | displaced->step_copy, | |
1337 | get_thread_regcache (displaced->step_ptid)); | |
237fc4c9 PA |
1338 | } |
1339 | else | |
1340 | { | |
1341 | /* Since the instruction didn't complete, all we can do is | |
1342 | relocate the PC. */ | |
515630c5 UW |
1343 | struct regcache *regcache = get_thread_regcache (event_ptid); |
1344 | CORE_ADDR pc = regcache_read_pc (regcache); | |
abbb1732 | 1345 | |
fc1cf338 | 1346 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1347 | regcache_write_pc (regcache, pc); |
237fc4c9 PA |
1348 | } |
1349 | ||
1350 | do_cleanups (old_cleanups); | |
1351 | ||
fc1cf338 | 1352 | displaced->step_ptid = null_ptid; |
1c5cfe86 | 1353 | |
237fc4c9 | 1354 | /* Are there any pending displaced stepping requests? If so, run |
fc1cf338 PA |
1355 | one now. Leave the state object around, since we're likely to |
1356 | need it again soon. */ | |
1357 | while (displaced->step_request_queue) | |
237fc4c9 PA |
1358 | { |
1359 | struct displaced_step_request *head; | |
1360 | ptid_t ptid; | |
5af949e3 | 1361 | struct regcache *regcache; |
929dfd4f | 1362 | struct gdbarch *gdbarch; |
1c5cfe86 | 1363 | CORE_ADDR actual_pc; |
6c95b8df | 1364 | struct address_space *aspace; |
237fc4c9 | 1365 | |
fc1cf338 | 1366 | head = displaced->step_request_queue; |
237fc4c9 | 1367 | ptid = head->ptid; |
fc1cf338 | 1368 | displaced->step_request_queue = head->next; |
237fc4c9 PA |
1369 | xfree (head); |
1370 | ||
ad53cd71 PA |
1371 | context_switch (ptid); |
1372 | ||
5af949e3 UW |
1373 | regcache = get_thread_regcache (ptid); |
1374 | actual_pc = regcache_read_pc (regcache); | |
6c95b8df | 1375 | aspace = get_regcache_aspace (regcache); |
1c5cfe86 | 1376 | |
6c95b8df | 1377 | if (breakpoint_here_p (aspace, actual_pc)) |
ad53cd71 | 1378 | { |
1c5cfe86 PA |
1379 | if (debug_displaced) |
1380 | fprintf_unfiltered (gdb_stdlog, | |
1381 | "displaced: stepping queued %s now\n", | |
1382 | target_pid_to_str (ptid)); | |
1383 | ||
1384 | displaced_step_prepare (ptid); | |
1385 | ||
929dfd4f JB |
1386 | gdbarch = get_regcache_arch (regcache); |
1387 | ||
1c5cfe86 PA |
1388 | if (debug_displaced) |
1389 | { | |
929dfd4f | 1390 | CORE_ADDR actual_pc = regcache_read_pc (regcache); |
1c5cfe86 PA |
1391 | gdb_byte buf[4]; |
1392 | ||
5af949e3 UW |
1393 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", |
1394 | paddress (gdbarch, actual_pc)); | |
1c5cfe86 PA |
1395 | read_memory (actual_pc, buf, sizeof (buf)); |
1396 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1397 | } | |
1398 | ||
fc1cf338 PA |
1399 | if (gdbarch_displaced_step_hw_singlestep (gdbarch, |
1400 | displaced->step_closure)) | |
929dfd4f | 1401 | target_resume (ptid, 1, TARGET_SIGNAL_0); |
99e40580 UW |
1402 | else |
1403 | target_resume (ptid, 0, TARGET_SIGNAL_0); | |
1c5cfe86 PA |
1404 | |
1405 | /* Done, we're stepping a thread. */ | |
1406 | break; | |
ad53cd71 | 1407 | } |
1c5cfe86 PA |
1408 | else |
1409 | { | |
1410 | int step; | |
1411 | struct thread_info *tp = inferior_thread (); | |
1412 | ||
1413 | /* The breakpoint we were sitting under has since been | |
1414 | removed. */ | |
1415 | tp->trap_expected = 0; | |
1416 | ||
1417 | /* Go back to what we were trying to do. */ | |
1418 | step = currently_stepping (tp); | |
ad53cd71 | 1419 | |
1c5cfe86 PA |
1420 | if (debug_displaced) |
1421 | fprintf_unfiltered (gdb_stdlog, "breakpoint is gone %s: step(%d)\n", | |
1422 | target_pid_to_str (tp->ptid), step); | |
1423 | ||
1424 | target_resume (ptid, step, TARGET_SIGNAL_0); | |
1425 | tp->stop_signal = TARGET_SIGNAL_0; | |
1426 | ||
1427 | /* This request was discarded. See if there's any other | |
1428 | thread waiting for its turn. */ | |
1429 | } | |
237fc4c9 PA |
1430 | } |
1431 | } | |
1432 | ||
5231c1fd PA |
1433 | /* Update global variables holding ptids to hold NEW_PTID if they were |
1434 | holding OLD_PTID. */ | |
1435 | static void | |
1436 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
1437 | { | |
1438 | struct displaced_step_request *it; | |
fc1cf338 | 1439 | struct displaced_step_inferior_state *displaced; |
5231c1fd PA |
1440 | |
1441 | if (ptid_equal (inferior_ptid, old_ptid)) | |
1442 | inferior_ptid = new_ptid; | |
1443 | ||
1444 | if (ptid_equal (singlestep_ptid, old_ptid)) | |
1445 | singlestep_ptid = new_ptid; | |
1446 | ||
5231c1fd PA |
1447 | if (ptid_equal (deferred_step_ptid, old_ptid)) |
1448 | deferred_step_ptid = new_ptid; | |
1449 | ||
fc1cf338 PA |
1450 | for (displaced = displaced_step_inferior_states; |
1451 | displaced; | |
1452 | displaced = displaced->next) | |
1453 | { | |
1454 | if (ptid_equal (displaced->step_ptid, old_ptid)) | |
1455 | displaced->step_ptid = new_ptid; | |
1456 | ||
1457 | for (it = displaced->step_request_queue; it; it = it->next) | |
1458 | if (ptid_equal (it->ptid, old_ptid)) | |
1459 | it->ptid = new_ptid; | |
1460 | } | |
5231c1fd PA |
1461 | } |
1462 | ||
237fc4c9 PA |
1463 | \f |
1464 | /* Resuming. */ | |
c906108c SS |
1465 | |
1466 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 1467 | static void |
74b7792f | 1468 | resume_cleanups (void *ignore) |
c906108c SS |
1469 | { |
1470 | normal_stop (); | |
1471 | } | |
1472 | ||
53904c9e AC |
1473 | static const char schedlock_off[] = "off"; |
1474 | static const char schedlock_on[] = "on"; | |
1475 | static const char schedlock_step[] = "step"; | |
488f131b | 1476 | static const char *scheduler_enums[] = { |
ef346e04 AC |
1477 | schedlock_off, |
1478 | schedlock_on, | |
1479 | schedlock_step, | |
1480 | NULL | |
1481 | }; | |
920d2a44 AC |
1482 | static const char *scheduler_mode = schedlock_off; |
1483 | static void | |
1484 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
1485 | struct cmd_list_element *c, const char *value) | |
1486 | { | |
1487 | fprintf_filtered (file, _("\ | |
1488 | Mode for locking scheduler during execution is \"%s\".\n"), | |
1489 | value); | |
1490 | } | |
c906108c SS |
1491 | |
1492 | static void | |
96baa820 | 1493 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 1494 | { |
eefe576e AC |
1495 | if (!target_can_lock_scheduler) |
1496 | { | |
1497 | scheduler_mode = schedlock_off; | |
1498 | error (_("Target '%s' cannot support this command."), target_shortname); | |
1499 | } | |
c906108c SS |
1500 | } |
1501 | ||
d4db2f36 PA |
1502 | /* True if execution commands resume all threads of all processes by |
1503 | default; otherwise, resume only threads of the current inferior | |
1504 | process. */ | |
1505 | int sched_multi = 0; | |
1506 | ||
2facfe5c DD |
1507 | /* Try to setup for software single stepping over the specified location. |
1508 | Return 1 if target_resume() should use hardware single step. | |
1509 | ||
1510 | GDBARCH the current gdbarch. | |
1511 | PC the location to step over. */ | |
1512 | ||
1513 | static int | |
1514 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1515 | { | |
1516 | int hw_step = 1; | |
1517 | ||
f02253f1 HZ |
1518 | if (execution_direction == EXEC_FORWARD |
1519 | && gdbarch_software_single_step_p (gdbarch) | |
99e40580 | 1520 | && gdbarch_software_single_step (gdbarch, get_current_frame ())) |
2facfe5c | 1521 | { |
99e40580 UW |
1522 | hw_step = 0; |
1523 | /* Do not pull these breakpoints until after a `wait' in | |
1524 | `wait_for_inferior' */ | |
1525 | singlestep_breakpoints_inserted_p = 1; | |
1526 | singlestep_ptid = inferior_ptid; | |
1527 | singlestep_pc = pc; | |
2facfe5c DD |
1528 | } |
1529 | return hw_step; | |
1530 | } | |
c906108c SS |
1531 | |
1532 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
1533 | wants to interrupt some lengthy single-stepping operation | |
1534 | (for child processes, the SIGINT goes to the inferior, and so | |
1535 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
1536 | other targets, that's not true). | |
1537 | ||
1538 | STEP nonzero if we should step (zero to continue instead). | |
1539 | SIG is the signal to give the inferior (zero for none). */ | |
1540 | void | |
96baa820 | 1541 | resume (int step, enum target_signal sig) |
c906108c SS |
1542 | { |
1543 | int should_resume = 1; | |
74b7792f | 1544 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
1545 | struct regcache *regcache = get_current_regcache (); |
1546 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4e1c45ea | 1547 | struct thread_info *tp = inferior_thread (); |
515630c5 | 1548 | CORE_ADDR pc = regcache_read_pc (regcache); |
6c95b8df | 1549 | struct address_space *aspace = get_regcache_aspace (regcache); |
c7e8a53c | 1550 | |
c906108c SS |
1551 | QUIT; |
1552 | ||
527159b7 | 1553 | if (debug_infrun) |
237fc4c9 PA |
1554 | fprintf_unfiltered (gdb_stdlog, |
1555 | "infrun: resume (step=%d, signal=%d), " | |
4e1c45ea PA |
1556 | "trap_expected=%d\n", |
1557 | step, sig, tp->trap_expected); | |
c906108c | 1558 | |
c2c6d25f JM |
1559 | /* Normally, by the time we reach `resume', the breakpoints are either |
1560 | removed or inserted, as appropriate. The exception is if we're sitting | |
1561 | at a permanent breakpoint; we need to step over it, but permanent | |
1562 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 1563 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 1564 | { |
515630c5 UW |
1565 | if (gdbarch_skip_permanent_breakpoint_p (gdbarch)) |
1566 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
6d350bb5 UW |
1567 | else |
1568 | error (_("\ | |
1569 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
1570 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
1571 | a command like `return' or `jump' to continue execution.")); | |
1572 | } | |
c2c6d25f | 1573 | |
237fc4c9 PA |
1574 | /* If enabled, step over breakpoints by executing a copy of the |
1575 | instruction at a different address. | |
1576 | ||
1577 | We can't use displaced stepping when we have a signal to deliver; | |
1578 | the comments for displaced_step_prepare explain why. The | |
1579 | comments in the handle_inferior event for dealing with 'random | |
1580 | signals' explain what we do instead. */ | |
515630c5 | 1581 | if (use_displaced_stepping (gdbarch) |
929dfd4f JB |
1582 | && (tp->trap_expected |
1583 | || (step && gdbarch_software_single_step_p (gdbarch))) | |
237fc4c9 PA |
1584 | && sig == TARGET_SIGNAL_0) |
1585 | { | |
fc1cf338 PA |
1586 | struct displaced_step_inferior_state *displaced; |
1587 | ||
237fc4c9 | 1588 | if (!displaced_step_prepare (inferior_ptid)) |
d56b7306 VP |
1589 | { |
1590 | /* Got placed in displaced stepping queue. Will be resumed | |
1591 | later when all the currently queued displaced stepping | |
7f7efbd9 VP |
1592 | requests finish. The thread is not executing at this point, |
1593 | and the call to set_executing will be made later. But we | |
1594 | need to call set_running here, since from frontend point of view, | |
1595 | the thread is running. */ | |
1596 | set_running (inferior_ptid, 1); | |
d56b7306 VP |
1597 | discard_cleanups (old_cleanups); |
1598 | return; | |
1599 | } | |
99e40580 | 1600 | |
fc1cf338 PA |
1601 | displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); |
1602 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, | |
1603 | displaced->step_closure); | |
237fc4c9 PA |
1604 | } |
1605 | ||
2facfe5c | 1606 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 1607 | else if (step) |
2facfe5c | 1608 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 1609 | |
c906108c SS |
1610 | if (should_resume) |
1611 | { | |
39f77062 | 1612 | ptid_t resume_ptid; |
dfcd3bfb | 1613 | |
cd76b0b7 VP |
1614 | /* If STEP is set, it's a request to use hardware stepping |
1615 | facilities. But in that case, we should never | |
1616 | use singlestep breakpoint. */ | |
1617 | gdb_assert (!(singlestep_breakpoints_inserted_p && step)); | |
1618 | ||
d4db2f36 PA |
1619 | /* Decide the set of threads to ask the target to resume. Start |
1620 | by assuming everything will be resumed, than narrow the set | |
1621 | by applying increasingly restricting conditions. */ | |
1622 | ||
1623 | /* By default, resume all threads of all processes. */ | |
1624 | resume_ptid = RESUME_ALL; | |
1625 | ||
1626 | /* Maybe resume only all threads of the current process. */ | |
1627 | if (!sched_multi && target_supports_multi_process ()) | |
1628 | { | |
1629 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
1630 | } | |
1631 | ||
1632 | /* Maybe resume a single thread after all. */ | |
cd76b0b7 VP |
1633 | if (singlestep_breakpoints_inserted_p |
1634 | && stepping_past_singlestep_breakpoint) | |
c906108c | 1635 | { |
cd76b0b7 VP |
1636 | /* The situation here is as follows. In thread T1 we wanted to |
1637 | single-step. Lacking hardware single-stepping we've | |
1638 | set breakpoint at the PC of the next instruction -- call it | |
1639 | P. After resuming, we've hit that breakpoint in thread T2. | |
1640 | Now we've removed original breakpoint, inserted breakpoint | |
1641 | at P+1, and try to step to advance T2 past breakpoint. | |
1642 | We need to step only T2, as if T1 is allowed to freely run, | |
1643 | it can run past P, and if other threads are allowed to run, | |
1644 | they can hit breakpoint at P+1, and nested hits of single-step | |
1645 | breakpoints is not something we'd want -- that's complicated | |
1646 | to support, and has no value. */ | |
1647 | resume_ptid = inferior_ptid; | |
1648 | } | |
d4db2f36 PA |
1649 | else if ((step || singlestep_breakpoints_inserted_p) |
1650 | && tp->trap_expected) | |
cd76b0b7 | 1651 | { |
74960c60 VP |
1652 | /* We're allowing a thread to run past a breakpoint it has |
1653 | hit, by single-stepping the thread with the breakpoint | |
1654 | removed. In which case, we need to single-step only this | |
1655 | thread, and keep others stopped, as they can miss this | |
1656 | breakpoint if allowed to run. | |
1657 | ||
1658 | The current code actually removes all breakpoints when | |
1659 | doing this, not just the one being stepped over, so if we | |
1660 | let other threads run, we can actually miss any | |
1661 | breakpoint, not just the one at PC. */ | |
ef5cf84e | 1662 | resume_ptid = inferior_ptid; |
c906108c | 1663 | } |
d4db2f36 | 1664 | else if (non_stop) |
94cc34af PA |
1665 | { |
1666 | /* With non-stop mode on, threads are always handled | |
1667 | individually. */ | |
1668 | resume_ptid = inferior_ptid; | |
1669 | } | |
1670 | else if ((scheduler_mode == schedlock_on) | |
1671 | || (scheduler_mode == schedlock_step | |
1672 | && (step || singlestep_breakpoints_inserted_p))) | |
c906108c | 1673 | { |
ef5cf84e | 1674 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 1675 | resume_ptid = inferior_ptid; |
c906108c | 1676 | } |
ef5cf84e | 1677 | |
515630c5 | 1678 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4ed33b9 AC |
1679 | { |
1680 | /* Most targets can step a breakpoint instruction, thus | |
1681 | executing it normally. But if this one cannot, just | |
1682 | continue and we will hit it anyway. */ | |
6c95b8df | 1683 | if (step && breakpoint_inserted_here_p (aspace, pc)) |
c4ed33b9 AC |
1684 | step = 0; |
1685 | } | |
237fc4c9 PA |
1686 | |
1687 | if (debug_displaced | |
515630c5 | 1688 | && use_displaced_stepping (gdbarch) |
4e1c45ea | 1689 | && tp->trap_expected) |
237fc4c9 | 1690 | { |
515630c5 | 1691 | struct regcache *resume_regcache = get_thread_regcache (resume_ptid); |
5af949e3 | 1692 | struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache); |
515630c5 | 1693 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
237fc4c9 PA |
1694 | gdb_byte buf[4]; |
1695 | ||
5af949e3 UW |
1696 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", |
1697 | paddress (resume_gdbarch, actual_pc)); | |
237fc4c9 PA |
1698 | read_memory (actual_pc, buf, sizeof (buf)); |
1699 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1700 | } | |
1701 | ||
e58b0e63 PA |
1702 | /* Install inferior's terminal modes. */ |
1703 | target_terminal_inferior (); | |
1704 | ||
2020b7ab PA |
1705 | /* Avoid confusing the next resume, if the next stop/resume |
1706 | happens to apply to another thread. */ | |
1707 | tp->stop_signal = TARGET_SIGNAL_0; | |
607cecd2 PA |
1708 | |
1709 | target_resume (resume_ptid, step, sig); | |
c906108c SS |
1710 | } |
1711 | ||
1712 | discard_cleanups (old_cleanups); | |
1713 | } | |
1714 | \f | |
237fc4c9 | 1715 | /* Proceeding. */ |
c906108c SS |
1716 | |
1717 | /* Clear out all variables saying what to do when inferior is continued. | |
1718 | First do this, then set the ones you want, then call `proceed'. */ | |
1719 | ||
a7212384 UW |
1720 | static void |
1721 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 1722 | { |
a7212384 UW |
1723 | if (debug_infrun) |
1724 | fprintf_unfiltered (gdb_stdlog, | |
1725 | "infrun: clear_proceed_status_thread (%s)\n", | |
1726 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 1727 | |
a7212384 UW |
1728 | tp->trap_expected = 0; |
1729 | tp->step_range_start = 0; | |
1730 | tp->step_range_end = 0; | |
1731 | tp->step_frame_id = null_frame_id; | |
edb3359d | 1732 | tp->step_stack_frame_id = null_frame_id; |
a7212384 UW |
1733 | tp->step_over_calls = STEP_OVER_UNDEBUGGABLE; |
1734 | tp->stop_requested = 0; | |
4e1c45ea | 1735 | |
a7212384 | 1736 | tp->stop_step = 0; |
32400beb | 1737 | |
a7212384 | 1738 | tp->proceed_to_finish = 0; |
414c69f7 | 1739 | |
a7212384 UW |
1740 | /* Discard any remaining commands or status from previous stop. */ |
1741 | bpstat_clear (&tp->stop_bpstat); | |
1742 | } | |
32400beb | 1743 | |
a7212384 UW |
1744 | static int |
1745 | clear_proceed_status_callback (struct thread_info *tp, void *data) | |
1746 | { | |
1747 | if (is_exited (tp->ptid)) | |
1748 | return 0; | |
d6b48e9c | 1749 | |
a7212384 UW |
1750 | clear_proceed_status_thread (tp); |
1751 | return 0; | |
1752 | } | |
1753 | ||
1754 | void | |
1755 | clear_proceed_status (void) | |
1756 | { | |
6c95b8df PA |
1757 | if (!non_stop) |
1758 | { | |
1759 | /* In all-stop mode, delete the per-thread status of all | |
1760 | threads, even if inferior_ptid is null_ptid, there may be | |
1761 | threads on the list. E.g., we may be launching a new | |
1762 | process, while selecting the executable. */ | |
1763 | iterate_over_threads (clear_proceed_status_callback, NULL); | |
1764 | } | |
1765 | ||
a7212384 UW |
1766 | if (!ptid_equal (inferior_ptid, null_ptid)) |
1767 | { | |
1768 | struct inferior *inferior; | |
1769 | ||
1770 | if (non_stop) | |
1771 | { | |
6c95b8df PA |
1772 | /* If in non-stop mode, only delete the per-thread status of |
1773 | the current thread. */ | |
a7212384 UW |
1774 | clear_proceed_status_thread (inferior_thread ()); |
1775 | } | |
6c95b8df | 1776 | |
d6b48e9c PA |
1777 | inferior = current_inferior (); |
1778 | inferior->stop_soon = NO_STOP_QUIETLY; | |
4e1c45ea PA |
1779 | } |
1780 | ||
c906108c | 1781 | stop_after_trap = 0; |
f3b1572e PA |
1782 | |
1783 | observer_notify_about_to_proceed (); | |
c906108c | 1784 | |
d5c31457 UW |
1785 | if (stop_registers) |
1786 | { | |
1787 | regcache_xfree (stop_registers); | |
1788 | stop_registers = NULL; | |
1789 | } | |
c906108c SS |
1790 | } |
1791 | ||
5a437975 DE |
1792 | /* Check the current thread against the thread that reported the most recent |
1793 | event. If a step-over is required return TRUE and set the current thread | |
1794 | to the old thread. Otherwise return FALSE. | |
1795 | ||
1796 | This should be suitable for any targets that support threads. */ | |
ea67f13b DJ |
1797 | |
1798 | static int | |
6a6b96b9 | 1799 | prepare_to_proceed (int step) |
ea67f13b DJ |
1800 | { |
1801 | ptid_t wait_ptid; | |
1802 | struct target_waitstatus wait_status; | |
5a437975 DE |
1803 | int schedlock_enabled; |
1804 | ||
1805 | /* With non-stop mode on, threads are always handled individually. */ | |
1806 | gdb_assert (! non_stop); | |
ea67f13b DJ |
1807 | |
1808 | /* Get the last target status returned by target_wait(). */ | |
1809 | get_last_target_status (&wait_ptid, &wait_status); | |
1810 | ||
6a6b96b9 | 1811 | /* Make sure we were stopped at a breakpoint. */ |
ea67f13b | 1812 | if (wait_status.kind != TARGET_WAITKIND_STOPPED |
2b009048 DJ |
1813 | || (wait_status.value.sig != TARGET_SIGNAL_TRAP |
1814 | && wait_status.value.sig != TARGET_SIGNAL_ILL | |
1815 | && wait_status.value.sig != TARGET_SIGNAL_SEGV | |
1816 | && wait_status.value.sig != TARGET_SIGNAL_EMT)) | |
ea67f13b DJ |
1817 | { |
1818 | return 0; | |
1819 | } | |
1820 | ||
5a437975 DE |
1821 | schedlock_enabled = (scheduler_mode == schedlock_on |
1822 | || (scheduler_mode == schedlock_step | |
1823 | && step)); | |
1824 | ||
d4db2f36 PA |
1825 | /* Don't switch over to WAIT_PTID if scheduler locking is on. */ |
1826 | if (schedlock_enabled) | |
1827 | return 0; | |
1828 | ||
1829 | /* Don't switch over if we're about to resume some other process | |
1830 | other than WAIT_PTID's, and schedule-multiple is off. */ | |
1831 | if (!sched_multi | |
1832 | && ptid_get_pid (wait_ptid) != ptid_get_pid (inferior_ptid)) | |
1833 | return 0; | |
1834 | ||
6a6b96b9 | 1835 | /* Switched over from WAIT_PID. */ |
ea67f13b | 1836 | if (!ptid_equal (wait_ptid, minus_one_ptid) |
d4db2f36 | 1837 | && !ptid_equal (inferior_ptid, wait_ptid)) |
ea67f13b | 1838 | { |
515630c5 UW |
1839 | struct regcache *regcache = get_thread_regcache (wait_ptid); |
1840 | ||
6c95b8df PA |
1841 | if (breakpoint_here_p (get_regcache_aspace (regcache), |
1842 | regcache_read_pc (regcache))) | |
ea67f13b | 1843 | { |
515630c5 UW |
1844 | /* If stepping, remember current thread to switch back to. */ |
1845 | if (step) | |
1846 | deferred_step_ptid = inferior_ptid; | |
ea67f13b | 1847 | |
515630c5 UW |
1848 | /* Switch back to WAIT_PID thread. */ |
1849 | switch_to_thread (wait_ptid); | |
6a6b96b9 | 1850 | |
515630c5 UW |
1851 | /* We return 1 to indicate that there is a breakpoint here, |
1852 | so we need to step over it before continuing to avoid | |
1853 | hitting it straight away. */ | |
1854 | return 1; | |
1855 | } | |
ea67f13b DJ |
1856 | } |
1857 | ||
1858 | return 0; | |
ea67f13b | 1859 | } |
e4846b08 | 1860 | |
c906108c SS |
1861 | /* Basic routine for continuing the program in various fashions. |
1862 | ||
1863 | ADDR is the address to resume at, or -1 for resume where stopped. | |
1864 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 1865 | or -1 for act according to how it stopped. |
c906108c | 1866 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
1867 | -1 means return after that and print nothing. |
1868 | You should probably set various step_... variables | |
1869 | before calling here, if you are stepping. | |
c906108c SS |
1870 | |
1871 | You should call clear_proceed_status before calling proceed. */ | |
1872 | ||
1873 | void | |
96baa820 | 1874 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c | 1875 | { |
e58b0e63 PA |
1876 | struct regcache *regcache; |
1877 | struct gdbarch *gdbarch; | |
4e1c45ea | 1878 | struct thread_info *tp; |
e58b0e63 | 1879 | CORE_ADDR pc; |
6c95b8df | 1880 | struct address_space *aspace; |
c906108c SS |
1881 | int oneproc = 0; |
1882 | ||
e58b0e63 PA |
1883 | /* If we're stopped at a fork/vfork, follow the branch set by the |
1884 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
1885 | resuming the current thread. */ | |
1886 | if (!follow_fork ()) | |
1887 | { | |
1888 | /* The target for some reason decided not to resume. */ | |
1889 | normal_stop (); | |
1890 | return; | |
1891 | } | |
1892 | ||
1893 | regcache = get_current_regcache (); | |
1894 | gdbarch = get_regcache_arch (regcache); | |
6c95b8df | 1895 | aspace = get_regcache_aspace (regcache); |
e58b0e63 PA |
1896 | pc = regcache_read_pc (regcache); |
1897 | ||
c906108c | 1898 | if (step > 0) |
515630c5 | 1899 | step_start_function = find_pc_function (pc); |
c906108c SS |
1900 | if (step < 0) |
1901 | stop_after_trap = 1; | |
1902 | ||
2acceee2 | 1903 | if (addr == (CORE_ADDR) -1) |
c906108c | 1904 | { |
6c95b8df | 1905 | if (pc == stop_pc && breakpoint_here_p (aspace, pc) |
b2175913 | 1906 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
1907 | /* There is a breakpoint at the address we will resume at, |
1908 | step one instruction before inserting breakpoints so that | |
1909 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
1910 | breakpoint). |
1911 | ||
1912 | Note, we don't do this in reverse, because we won't | |
1913 | actually be executing the breakpoint insn anyway. | |
1914 | We'll be (un-)executing the previous instruction. */ | |
1915 | ||
c906108c | 1916 | oneproc = 1; |
515630c5 UW |
1917 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
1918 | && gdbarch_single_step_through_delay (gdbarch, | |
1919 | get_current_frame ())) | |
3352ef37 AC |
1920 | /* We stepped onto an instruction that needs to be stepped |
1921 | again before re-inserting the breakpoint, do so. */ | |
c906108c SS |
1922 | oneproc = 1; |
1923 | } | |
1924 | else | |
1925 | { | |
515630c5 | 1926 | regcache_write_pc (regcache, addr); |
c906108c SS |
1927 | } |
1928 | ||
527159b7 | 1929 | if (debug_infrun) |
8a9de0e4 | 1930 | fprintf_unfiltered (gdb_stdlog, |
5af949e3 UW |
1931 | "infrun: proceed (addr=%s, signal=%d, step=%d)\n", |
1932 | paddress (gdbarch, addr), siggnal, step); | |
527159b7 | 1933 | |
06cd862c PA |
1934 | /* We're handling a live event, so make sure we're doing live |
1935 | debugging. If we're looking at traceframes while the target is | |
1936 | running, we're going to need to get back to that mode after | |
1937 | handling the event. */ | |
1938 | if (non_stop) | |
1939 | { | |
1940 | make_cleanup_restore_current_traceframe (); | |
1941 | set_traceframe_number (-1); | |
1942 | } | |
1943 | ||
94cc34af PA |
1944 | if (non_stop) |
1945 | /* In non-stop, each thread is handled individually. The context | |
1946 | must already be set to the right thread here. */ | |
1947 | ; | |
1948 | else | |
1949 | { | |
1950 | /* In a multi-threaded task we may select another thread and | |
1951 | then continue or step. | |
c906108c | 1952 | |
94cc34af PA |
1953 | But if the old thread was stopped at a breakpoint, it will |
1954 | immediately cause another breakpoint stop without any | |
1955 | execution (i.e. it will report a breakpoint hit incorrectly). | |
1956 | So we must step over it first. | |
c906108c | 1957 | |
94cc34af PA |
1958 | prepare_to_proceed checks the current thread against the |
1959 | thread that reported the most recent event. If a step-over | |
1960 | is required it returns TRUE and sets the current thread to | |
1961 | the old thread. */ | |
1962 | if (prepare_to_proceed (step)) | |
1963 | oneproc = 1; | |
1964 | } | |
c906108c | 1965 | |
4e1c45ea PA |
1966 | /* prepare_to_proceed may change the current thread. */ |
1967 | tp = inferior_thread (); | |
1968 | ||
c906108c | 1969 | if (oneproc) |
74960c60 | 1970 | { |
4e1c45ea | 1971 | tp->trap_expected = 1; |
237fc4c9 PA |
1972 | /* If displaced stepping is enabled, we can step over the |
1973 | breakpoint without hitting it, so leave all breakpoints | |
1974 | inserted. Otherwise we need to disable all breakpoints, step | |
1975 | one instruction, and then re-add them when that step is | |
1976 | finished. */ | |
515630c5 | 1977 | if (!use_displaced_stepping (gdbarch)) |
237fc4c9 | 1978 | remove_breakpoints (); |
74960c60 | 1979 | } |
237fc4c9 PA |
1980 | |
1981 | /* We can insert breakpoints if we're not trying to step over one, | |
1982 | or if we are stepping over one but we're using displaced stepping | |
1983 | to do so. */ | |
4e1c45ea | 1984 | if (! tp->trap_expected || use_displaced_stepping (gdbarch)) |
c36b740a | 1985 | insert_breakpoints (); |
c906108c | 1986 | |
2020b7ab PA |
1987 | if (!non_stop) |
1988 | { | |
1989 | /* Pass the last stop signal to the thread we're resuming, | |
1990 | irrespective of whether the current thread is the thread that | |
1991 | got the last event or not. This was historically GDB's | |
1992 | behaviour before keeping a stop_signal per thread. */ | |
1993 | ||
1994 | struct thread_info *last_thread; | |
1995 | ptid_t last_ptid; | |
1996 | struct target_waitstatus last_status; | |
1997 | ||
1998 | get_last_target_status (&last_ptid, &last_status); | |
1999 | if (!ptid_equal (inferior_ptid, last_ptid) | |
2000 | && !ptid_equal (last_ptid, null_ptid) | |
2001 | && !ptid_equal (last_ptid, minus_one_ptid)) | |
2002 | { | |
e09875d4 | 2003 | last_thread = find_thread_ptid (last_ptid); |
2020b7ab PA |
2004 | if (last_thread) |
2005 | { | |
2006 | tp->stop_signal = last_thread->stop_signal; | |
2007 | last_thread->stop_signal = TARGET_SIGNAL_0; | |
2008 | } | |
2009 | } | |
2010 | } | |
2011 | ||
c906108c | 2012 | if (siggnal != TARGET_SIGNAL_DEFAULT) |
2020b7ab | 2013 | tp->stop_signal = siggnal; |
c906108c SS |
2014 | /* If this signal should not be seen by program, |
2015 | give it zero. Used for debugging signals. */ | |
2020b7ab PA |
2016 | else if (!signal_program[tp->stop_signal]) |
2017 | tp->stop_signal = TARGET_SIGNAL_0; | |
c906108c SS |
2018 | |
2019 | annotate_starting (); | |
2020 | ||
2021 | /* Make sure that output from GDB appears before output from the | |
2022 | inferior. */ | |
2023 | gdb_flush (gdb_stdout); | |
2024 | ||
e4846b08 JJ |
2025 | /* Refresh prev_pc value just prior to resuming. This used to be |
2026 | done in stop_stepping, however, setting prev_pc there did not handle | |
2027 | scenarios such as inferior function calls or returning from | |
2028 | a function via the return command. In those cases, the prev_pc | |
2029 | value was not set properly for subsequent commands. The prev_pc value | |
2030 | is used to initialize the starting line number in the ecs. With an | |
2031 | invalid value, the gdb next command ends up stopping at the position | |
2032 | represented by the next line table entry past our start position. | |
2033 | On platforms that generate one line table entry per line, this | |
2034 | is not a problem. However, on the ia64, the compiler generates | |
2035 | extraneous line table entries that do not increase the line number. | |
2036 | When we issue the gdb next command on the ia64 after an inferior call | |
2037 | or a return command, we often end up a few instructions forward, still | |
2038 | within the original line we started. | |
2039 | ||
d5cd6034 JB |
2040 | An attempt was made to refresh the prev_pc at the same time the |
2041 | execution_control_state is initialized (for instance, just before | |
2042 | waiting for an inferior event). But this approach did not work | |
2043 | because of platforms that use ptrace, where the pc register cannot | |
2044 | be read unless the inferior is stopped. At that point, we are not | |
2045 | guaranteed the inferior is stopped and so the regcache_read_pc() call | |
2046 | can fail. Setting the prev_pc value here ensures the value is updated | |
2047 | correctly when the inferior is stopped. */ | |
4e1c45ea | 2048 | tp->prev_pc = regcache_read_pc (get_current_regcache ()); |
e4846b08 | 2049 | |
59f0d5d9 | 2050 | /* Fill in with reasonable starting values. */ |
4e1c45ea | 2051 | init_thread_stepping_state (tp); |
59f0d5d9 | 2052 | |
59f0d5d9 PA |
2053 | /* Reset to normal state. */ |
2054 | init_infwait_state (); | |
2055 | ||
c906108c | 2056 | /* Resume inferior. */ |
2020b7ab | 2057 | resume (oneproc || step || bpstat_should_step (), tp->stop_signal); |
c906108c SS |
2058 | |
2059 | /* Wait for it to stop (if not standalone) | |
2060 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
2061 | /* Do this only if we are not using the event loop, or if the target |
2062 | does not support asynchronous execution. */ | |
362646f5 | 2063 | if (!target_can_async_p ()) |
43ff13b4 | 2064 | { |
ae123ec6 | 2065 | wait_for_inferior (0); |
43ff13b4 JM |
2066 | normal_stop (); |
2067 | } | |
c906108c | 2068 | } |
c906108c SS |
2069 | \f |
2070 | ||
2071 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 2072 | |
c906108c | 2073 | void |
8621d6a9 | 2074 | start_remote (int from_tty) |
c906108c | 2075 | { |
d6b48e9c | 2076 | struct inferior *inferior; |
d6b48e9c | 2077 | |
abbb1732 | 2078 | init_wait_for_inferior (); |
d6b48e9c PA |
2079 | inferior = current_inferior (); |
2080 | inferior->stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 2081 | |
6426a772 JM |
2082 | /* Always go on waiting for the target, regardless of the mode. */ |
2083 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 2084 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
2085 | nothing is returned (instead of just blocking). Because of this, |
2086 | targets expecting an immediate response need to, internally, set | |
2087 | things up so that the target_wait() is forced to eventually | |
2088 | timeout. */ | |
2089 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
2090 | differentiate to its caller what the state of the target is after | |
2091 | the initial open has been performed. Here we're assuming that | |
2092 | the target has stopped. It should be possible to eventually have | |
2093 | target_open() return to the caller an indication that the target | |
2094 | is currently running and GDB state should be set to the same as | |
2095 | for an async run. */ | |
ae123ec6 | 2096 | wait_for_inferior (0); |
8621d6a9 DJ |
2097 | |
2098 | /* Now that the inferior has stopped, do any bookkeeping like | |
2099 | loading shared libraries. We want to do this before normal_stop, | |
2100 | so that the displayed frame is up to date. */ | |
2101 | post_create_inferior (¤t_target, from_tty); | |
2102 | ||
6426a772 | 2103 | normal_stop (); |
c906108c SS |
2104 | } |
2105 | ||
2106 | /* Initialize static vars when a new inferior begins. */ | |
2107 | ||
2108 | void | |
96baa820 | 2109 | init_wait_for_inferior (void) |
c906108c SS |
2110 | { |
2111 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 2112 | |
c906108c SS |
2113 | breakpoint_init_inferior (inf_starting); |
2114 | ||
c906108c | 2115 | clear_proceed_status (); |
9f976b41 DJ |
2116 | |
2117 | stepping_past_singlestep_breakpoint = 0; | |
ca67fcb8 | 2118 | deferred_step_ptid = null_ptid; |
ca005067 DJ |
2119 | |
2120 | target_last_wait_ptid = minus_one_ptid; | |
237fc4c9 | 2121 | |
0d1e5fa7 PA |
2122 | previous_inferior_ptid = null_ptid; |
2123 | init_infwait_state (); | |
2124 | ||
edb3359d DJ |
2125 | /* Discard any skipped inlined frames. */ |
2126 | clear_inline_frame_state (minus_one_ptid); | |
c906108c | 2127 | } |
237fc4c9 | 2128 | |
c906108c | 2129 | \f |
b83266a0 SS |
2130 | /* This enum encodes possible reasons for doing a target_wait, so that |
2131 | wfi can call target_wait in one place. (Ultimately the call will be | |
2132 | moved out of the infinite loop entirely.) */ | |
2133 | ||
c5aa993b JM |
2134 | enum infwait_states |
2135 | { | |
cd0fc7c3 SS |
2136 | infwait_normal_state, |
2137 | infwait_thread_hop_state, | |
d983da9c | 2138 | infwait_step_watch_state, |
cd0fc7c3 | 2139 | infwait_nonstep_watch_state |
b83266a0 SS |
2140 | }; |
2141 | ||
11cf8741 JM |
2142 | /* Why did the inferior stop? Used to print the appropriate messages |
2143 | to the interface from within handle_inferior_event(). */ | |
2144 | enum inferior_stop_reason | |
2145 | { | |
11cf8741 JM |
2146 | /* Step, next, nexti, stepi finished. */ |
2147 | END_STEPPING_RANGE, | |
11cf8741 JM |
2148 | /* Inferior terminated by signal. */ |
2149 | SIGNAL_EXITED, | |
2150 | /* Inferior exited. */ | |
2151 | EXITED, | |
2152 | /* Inferior received signal, and user asked to be notified. */ | |
b2175913 MS |
2153 | SIGNAL_RECEIVED, |
2154 | /* Reverse execution -- target ran out of history info. */ | |
2155 | NO_HISTORY | |
11cf8741 JM |
2156 | }; |
2157 | ||
0d1e5fa7 PA |
2158 | /* The PTID we'll do a target_wait on.*/ |
2159 | ptid_t waiton_ptid; | |
2160 | ||
2161 | /* Current inferior wait state. */ | |
2162 | enum infwait_states infwait_state; | |
cd0fc7c3 | 2163 | |
0d1e5fa7 PA |
2164 | /* Data to be passed around while handling an event. This data is |
2165 | discarded between events. */ | |
c5aa993b | 2166 | struct execution_control_state |
488f131b | 2167 | { |
0d1e5fa7 | 2168 | ptid_t ptid; |
4e1c45ea PA |
2169 | /* The thread that got the event, if this was a thread event; NULL |
2170 | otherwise. */ | |
2171 | struct thread_info *event_thread; | |
2172 | ||
488f131b | 2173 | struct target_waitstatus ws; |
488f131b JB |
2174 | int random_signal; |
2175 | CORE_ADDR stop_func_start; | |
2176 | CORE_ADDR stop_func_end; | |
2177 | char *stop_func_name; | |
488f131b | 2178 | int new_thread_event; |
488f131b JB |
2179 | int wait_some_more; |
2180 | }; | |
2181 | ||
ec9499be | 2182 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 2183 | |
568d6575 UW |
2184 | static void handle_step_into_function (struct gdbarch *gdbarch, |
2185 | struct execution_control_state *ecs); | |
2186 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
2187 | struct execution_control_state *ecs); | |
44cbf7b5 | 2188 | static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame); |
14e60db5 | 2189 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); |
a6d9a66e UW |
2190 | static void insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
2191 | struct symtab_and_line sr_sal, | |
44cbf7b5 | 2192 | struct frame_id sr_id); |
a6d9a66e | 2193 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
611c83ae | 2194 | |
104c1213 JM |
2195 | static void stop_stepping (struct execution_control_state *ecs); |
2196 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 2197 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
2198 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
2199 | int stop_info); | |
104c1213 | 2200 | |
252fbfc8 PA |
2201 | /* Callback for iterate over threads. If the thread is stopped, but |
2202 | the user/frontend doesn't know about that yet, go through | |
2203 | normal_stop, as if the thread had just stopped now. ARG points at | |
2204 | a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If | |
2205 | ptid_is_pid(PTID) is true, applies to all threads of the process | |
2206 | pointed at by PTID. Otherwise, apply only to the thread pointed by | |
2207 | PTID. */ | |
2208 | ||
2209 | static int | |
2210 | infrun_thread_stop_requested_callback (struct thread_info *info, void *arg) | |
2211 | { | |
2212 | ptid_t ptid = * (ptid_t *) arg; | |
2213 | ||
2214 | if ((ptid_equal (info->ptid, ptid) | |
2215 | || ptid_equal (minus_one_ptid, ptid) | |
2216 | || (ptid_is_pid (ptid) | |
2217 | && ptid_get_pid (ptid) == ptid_get_pid (info->ptid))) | |
2218 | && is_running (info->ptid) | |
2219 | && !is_executing (info->ptid)) | |
2220 | { | |
2221 | struct cleanup *old_chain; | |
2222 | struct execution_control_state ecss; | |
2223 | struct execution_control_state *ecs = &ecss; | |
2224 | ||
2225 | memset (ecs, 0, sizeof (*ecs)); | |
2226 | ||
2227 | old_chain = make_cleanup_restore_current_thread (); | |
2228 | ||
2229 | switch_to_thread (info->ptid); | |
2230 | ||
2231 | /* Go through handle_inferior_event/normal_stop, so we always | |
2232 | have consistent output as if the stop event had been | |
2233 | reported. */ | |
2234 | ecs->ptid = info->ptid; | |
e09875d4 | 2235 | ecs->event_thread = find_thread_ptid (info->ptid); |
252fbfc8 PA |
2236 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; |
2237 | ecs->ws.value.sig = TARGET_SIGNAL_0; | |
2238 | ||
2239 | handle_inferior_event (ecs); | |
2240 | ||
2241 | if (!ecs->wait_some_more) | |
2242 | { | |
2243 | struct thread_info *tp; | |
2244 | ||
2245 | normal_stop (); | |
2246 | ||
2247 | /* Finish off the continuations. The continations | |
2248 | themselves are responsible for realising the thread | |
2249 | didn't finish what it was supposed to do. */ | |
2250 | tp = inferior_thread (); | |
2251 | do_all_intermediate_continuations_thread (tp); | |
2252 | do_all_continuations_thread (tp); | |
2253 | } | |
2254 | ||
2255 | do_cleanups (old_chain); | |
2256 | } | |
2257 | ||
2258 | return 0; | |
2259 | } | |
2260 | ||
2261 | /* This function is attached as a "thread_stop_requested" observer. | |
2262 | Cleanup local state that assumed the PTID was to be resumed, and | |
2263 | report the stop to the frontend. */ | |
2264 | ||
2c0b251b | 2265 | static void |
252fbfc8 PA |
2266 | infrun_thread_stop_requested (ptid_t ptid) |
2267 | { | |
fc1cf338 | 2268 | struct displaced_step_inferior_state *displaced; |
252fbfc8 PA |
2269 | |
2270 | /* PTID was requested to stop. Remove it from the displaced | |
2271 | stepping queue, so we don't try to resume it automatically. */ | |
fc1cf338 PA |
2272 | |
2273 | for (displaced = displaced_step_inferior_states; | |
2274 | displaced; | |
2275 | displaced = displaced->next) | |
252fbfc8 | 2276 | { |
fc1cf338 | 2277 | struct displaced_step_request *it, **prev_next_p; |
252fbfc8 | 2278 | |
fc1cf338 PA |
2279 | it = displaced->step_request_queue; |
2280 | prev_next_p = &displaced->step_request_queue; | |
2281 | while (it) | |
252fbfc8 | 2282 | { |
fc1cf338 PA |
2283 | if (ptid_match (it->ptid, ptid)) |
2284 | { | |
2285 | *prev_next_p = it->next; | |
2286 | it->next = NULL; | |
2287 | xfree (it); | |
2288 | } | |
252fbfc8 | 2289 | else |
fc1cf338 PA |
2290 | { |
2291 | prev_next_p = &it->next; | |
2292 | } | |
252fbfc8 | 2293 | |
fc1cf338 | 2294 | it = *prev_next_p; |
252fbfc8 | 2295 | } |
252fbfc8 PA |
2296 | } |
2297 | ||
2298 | iterate_over_threads (infrun_thread_stop_requested_callback, &ptid); | |
2299 | } | |
2300 | ||
a07daef3 PA |
2301 | static void |
2302 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
2303 | { | |
2304 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
2305 | nullify_last_target_wait_ptid (); | |
2306 | } | |
2307 | ||
4e1c45ea PA |
2308 | /* Callback for iterate_over_threads. */ |
2309 | ||
2310 | static int | |
2311 | delete_step_resume_breakpoint_callback (struct thread_info *info, void *data) | |
2312 | { | |
2313 | if (is_exited (info->ptid)) | |
2314 | return 0; | |
2315 | ||
2316 | delete_step_resume_breakpoint (info); | |
2317 | return 0; | |
2318 | } | |
2319 | ||
2320 | /* In all-stop, delete the step resume breakpoint of any thread that | |
2321 | had one. In non-stop, delete the step resume breakpoint of the | |
2322 | thread that just stopped. */ | |
2323 | ||
2324 | static void | |
2325 | delete_step_thread_step_resume_breakpoint (void) | |
2326 | { | |
2327 | if (!target_has_execution | |
2328 | || ptid_equal (inferior_ptid, null_ptid)) | |
2329 | /* If the inferior has exited, we have already deleted the step | |
2330 | resume breakpoints out of GDB's lists. */ | |
2331 | return; | |
2332 | ||
2333 | if (non_stop) | |
2334 | { | |
2335 | /* If in non-stop mode, only delete the step-resume or | |
2336 | longjmp-resume breakpoint of the thread that just stopped | |
2337 | stepping. */ | |
2338 | struct thread_info *tp = inferior_thread (); | |
abbb1732 | 2339 | |
4e1c45ea PA |
2340 | delete_step_resume_breakpoint (tp); |
2341 | } | |
2342 | else | |
2343 | /* In all-stop mode, delete all step-resume and longjmp-resume | |
2344 | breakpoints of any thread that had them. */ | |
2345 | iterate_over_threads (delete_step_resume_breakpoint_callback, NULL); | |
2346 | } | |
2347 | ||
2348 | /* A cleanup wrapper. */ | |
2349 | ||
2350 | static void | |
2351 | delete_step_thread_step_resume_breakpoint_cleanup (void *arg) | |
2352 | { | |
2353 | delete_step_thread_step_resume_breakpoint (); | |
2354 | } | |
2355 | ||
223698f8 DE |
2356 | /* Pretty print the results of target_wait, for debugging purposes. */ |
2357 | ||
2358 | static void | |
2359 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, | |
2360 | const struct target_waitstatus *ws) | |
2361 | { | |
2362 | char *status_string = target_waitstatus_to_string (ws); | |
2363 | struct ui_file *tmp_stream = mem_fileopen (); | |
2364 | char *text; | |
223698f8 DE |
2365 | |
2366 | /* The text is split over several lines because it was getting too long. | |
2367 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
2368 | output as a unit; we want only one timestamp printed if debug_timestamp | |
2369 | is set. */ | |
2370 | ||
2371 | fprintf_unfiltered (tmp_stream, | |
2372 | "infrun: target_wait (%d", PIDGET (waiton_ptid)); | |
2373 | if (PIDGET (waiton_ptid) != -1) | |
2374 | fprintf_unfiltered (tmp_stream, | |
2375 | " [%s]", target_pid_to_str (waiton_ptid)); | |
2376 | fprintf_unfiltered (tmp_stream, ", status) =\n"); | |
2377 | fprintf_unfiltered (tmp_stream, | |
2378 | "infrun: %d [%s],\n", | |
2379 | PIDGET (result_ptid), target_pid_to_str (result_ptid)); | |
2380 | fprintf_unfiltered (tmp_stream, | |
2381 | "infrun: %s\n", | |
2382 | status_string); | |
2383 | ||
759ef836 | 2384 | text = ui_file_xstrdup (tmp_stream, NULL); |
223698f8 DE |
2385 | |
2386 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
2387 | a gcc error: the format attribute requires a string literal. */ | |
2388 | fprintf_unfiltered (gdb_stdlog, "%s", text); | |
2389 | ||
2390 | xfree (status_string); | |
2391 | xfree (text); | |
2392 | ui_file_delete (tmp_stream); | |
2393 | } | |
2394 | ||
24291992 PA |
2395 | /* Prepare and stabilize the inferior for detaching it. E.g., |
2396 | detaching while a thread is displaced stepping is a recipe for | |
2397 | crashing it, as nothing would readjust the PC out of the scratch | |
2398 | pad. */ | |
2399 | ||
2400 | void | |
2401 | prepare_for_detach (void) | |
2402 | { | |
2403 | struct inferior *inf = current_inferior (); | |
2404 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
2405 | struct cleanup *old_chain_1; | |
2406 | struct displaced_step_inferior_state *displaced; | |
2407 | ||
2408 | displaced = get_displaced_stepping_state (inf->pid); | |
2409 | ||
2410 | /* Is any thread of this process displaced stepping? If not, | |
2411 | there's nothing else to do. */ | |
2412 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
2413 | return; | |
2414 | ||
2415 | if (debug_infrun) | |
2416 | fprintf_unfiltered (gdb_stdlog, | |
2417 | "displaced-stepping in-process while detaching"); | |
2418 | ||
2419 | old_chain_1 = make_cleanup_restore_integer (&inf->detaching); | |
2420 | inf->detaching = 1; | |
2421 | ||
2422 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
2423 | { | |
2424 | struct cleanup *old_chain_2; | |
2425 | struct execution_control_state ecss; | |
2426 | struct execution_control_state *ecs; | |
2427 | ||
2428 | ecs = &ecss; | |
2429 | memset (ecs, 0, sizeof (*ecs)); | |
2430 | ||
2431 | overlay_cache_invalid = 1; | |
2432 | ||
2433 | /* We have to invalidate the registers BEFORE calling | |
2434 | target_wait because they can be loaded from the target while | |
2435 | in target_wait. This makes remote debugging a bit more | |
2436 | efficient for those targets that provide critical registers | |
2437 | as part of their normal status mechanism. */ | |
2438 | ||
2439 | registers_changed (); | |
2440 | ||
2441 | if (deprecated_target_wait_hook) | |
2442 | ecs->ptid = deprecated_target_wait_hook (pid_ptid, &ecs->ws, 0); | |
2443 | else | |
2444 | ecs->ptid = target_wait (pid_ptid, &ecs->ws, 0); | |
2445 | ||
2446 | if (debug_infrun) | |
2447 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
2448 | ||
2449 | /* If an error happens while handling the event, propagate GDB's | |
2450 | knowledge of the executing state to the frontend/user running | |
2451 | state. */ | |
2452 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2453 | ||
4d533103 PA |
2454 | /* In non-stop mode, each thread is handled individually. |
2455 | Switch early, so the global state is set correctly for this | |
2456 | thread. */ | |
2457 | if (non_stop | |
2458 | && ecs->ws.kind != TARGET_WAITKIND_EXITED | |
2459 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) | |
2460 | context_switch (ecs->ptid); | |
2461 | ||
24291992 PA |
2462 | /* Now figure out what to do with the result of the result. */ |
2463 | handle_inferior_event (ecs); | |
2464 | ||
2465 | /* No error, don't finish the state yet. */ | |
2466 | discard_cleanups (old_chain_2); | |
2467 | ||
2468 | /* Breakpoints and watchpoints are not installed on the target | |
2469 | at this point, and signals are passed directly to the | |
2470 | inferior, so this must mean the process is gone. */ | |
2471 | if (!ecs->wait_some_more) | |
2472 | { | |
2473 | discard_cleanups (old_chain_1); | |
2474 | error (_("Program exited while detaching")); | |
2475 | } | |
2476 | } | |
2477 | ||
2478 | discard_cleanups (old_chain_1); | |
2479 | } | |
2480 | ||
cd0fc7c3 | 2481 | /* Wait for control to return from inferior to debugger. |
ae123ec6 JB |
2482 | |
2483 | If TREAT_EXEC_AS_SIGTRAP is non-zero, then handle EXEC signals | |
2484 | as if they were SIGTRAP signals. This can be useful during | |
2485 | the startup sequence on some targets such as HP/UX, where | |
2486 | we receive an EXEC event instead of the expected SIGTRAP. | |
2487 | ||
cd0fc7c3 SS |
2488 | If inferior gets a signal, we may decide to start it up again |
2489 | instead of returning. That is why there is a loop in this function. | |
2490 | When this function actually returns it means the inferior | |
2491 | should be left stopped and GDB should read more commands. */ | |
2492 | ||
2493 | void | |
ae123ec6 | 2494 | wait_for_inferior (int treat_exec_as_sigtrap) |
cd0fc7c3 SS |
2495 | { |
2496 | struct cleanup *old_cleanups; | |
0d1e5fa7 | 2497 | struct execution_control_state ecss; |
cd0fc7c3 | 2498 | struct execution_control_state *ecs; |
c906108c | 2499 | |
527159b7 | 2500 | if (debug_infrun) |
ae123ec6 JB |
2501 | fprintf_unfiltered |
2502 | (gdb_stdlog, "infrun: wait_for_inferior (treat_exec_as_sigtrap=%d)\n", | |
2503 | treat_exec_as_sigtrap); | |
527159b7 | 2504 | |
4e1c45ea PA |
2505 | old_cleanups = |
2506 | make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup, NULL); | |
cd0fc7c3 | 2507 | |
cd0fc7c3 | 2508 | ecs = &ecss; |
0d1e5fa7 PA |
2509 | memset (ecs, 0, sizeof (*ecs)); |
2510 | ||
e0bb1c1c PA |
2511 | /* We'll update this if & when we switch to a new thread. */ |
2512 | previous_inferior_ptid = inferior_ptid; | |
2513 | ||
c906108c SS |
2514 | while (1) |
2515 | { | |
29f49a6a PA |
2516 | struct cleanup *old_chain; |
2517 | ||
ec9499be UW |
2518 | /* We have to invalidate the registers BEFORE calling target_wait |
2519 | because they can be loaded from the target while in target_wait. | |
2520 | This makes remote debugging a bit more efficient for those | |
2521 | targets that provide critical registers as part of their normal | |
2522 | status mechanism. */ | |
2523 | ||
2524 | overlay_cache_invalid = 1; | |
2525 | registers_changed (); | |
2526 | ||
9a4105ab | 2527 | if (deprecated_target_wait_hook) |
47608cb1 | 2528 | ecs->ptid = deprecated_target_wait_hook (waiton_ptid, &ecs->ws, 0); |
cd0fc7c3 | 2529 | else |
47608cb1 | 2530 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 2531 | |
f00150c9 | 2532 | if (debug_infrun) |
223698f8 | 2533 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 2534 | |
ae123ec6 JB |
2535 | if (treat_exec_as_sigtrap && ecs->ws.kind == TARGET_WAITKIND_EXECD) |
2536 | { | |
2537 | xfree (ecs->ws.value.execd_pathname); | |
2538 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
2539 | ecs->ws.value.sig = TARGET_SIGNAL_TRAP; | |
2540 | } | |
2541 | ||
29f49a6a PA |
2542 | /* If an error happens while handling the event, propagate GDB's |
2543 | knowledge of the executing state to the frontend/user running | |
2544 | state. */ | |
2545 | old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2546 | ||
a96d9b2e SDJ |
2547 | if (ecs->ws.kind == TARGET_WAITKIND_SYSCALL_ENTRY |
2548 | || ecs->ws.kind == TARGET_WAITKIND_SYSCALL_RETURN) | |
2549 | ecs->ws.value.syscall_number = UNKNOWN_SYSCALL; | |
2550 | ||
cd0fc7c3 SS |
2551 | /* Now figure out what to do with the result of the result. */ |
2552 | handle_inferior_event (ecs); | |
c906108c | 2553 | |
29f49a6a PA |
2554 | /* No error, don't finish the state yet. */ |
2555 | discard_cleanups (old_chain); | |
2556 | ||
cd0fc7c3 SS |
2557 | if (!ecs->wait_some_more) |
2558 | break; | |
2559 | } | |
4e1c45ea | 2560 | |
cd0fc7c3 SS |
2561 | do_cleanups (old_cleanups); |
2562 | } | |
c906108c | 2563 | |
43ff13b4 JM |
2564 | /* Asynchronous version of wait_for_inferior. It is called by the |
2565 | event loop whenever a change of state is detected on the file | |
2566 | descriptor corresponding to the target. It can be called more than | |
2567 | once to complete a single execution command. In such cases we need | |
a474d7c2 PA |
2568 | to keep the state in a global variable ECSS. If it is the last time |
2569 | that this function is called for a single execution command, then | |
2570 | report to the user that the inferior has stopped, and do the | |
2571 | necessary cleanups. */ | |
43ff13b4 JM |
2572 | |
2573 | void | |
fba45db2 | 2574 | fetch_inferior_event (void *client_data) |
43ff13b4 | 2575 | { |
0d1e5fa7 | 2576 | struct execution_control_state ecss; |
a474d7c2 | 2577 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 2578 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 2579 | struct cleanup *ts_old_chain; |
4f8d22e3 | 2580 | int was_sync = sync_execution; |
43ff13b4 | 2581 | |
0d1e5fa7 PA |
2582 | memset (ecs, 0, sizeof (*ecs)); |
2583 | ||
ec9499be UW |
2584 | /* We'll update this if & when we switch to a new thread. */ |
2585 | previous_inferior_ptid = inferior_ptid; | |
e0bb1c1c | 2586 | |
4f8d22e3 PA |
2587 | if (non_stop) |
2588 | /* In non-stop mode, the user/frontend should not notice a thread | |
2589 | switch due to internal events. Make sure we reverse to the | |
2590 | user selected thread and frame after handling the event and | |
2591 | running any breakpoint commands. */ | |
2592 | make_cleanup_restore_current_thread (); | |
2593 | ||
59f0d5d9 PA |
2594 | /* We have to invalidate the registers BEFORE calling target_wait |
2595 | because they can be loaded from the target while in target_wait. | |
2596 | This makes remote debugging a bit more efficient for those | |
2597 | targets that provide critical registers as part of their normal | |
2598 | status mechanism. */ | |
43ff13b4 | 2599 | |
ec9499be | 2600 | overlay_cache_invalid = 1; |
59f0d5d9 | 2601 | registers_changed (); |
43ff13b4 | 2602 | |
9a4105ab | 2603 | if (deprecated_target_wait_hook) |
a474d7c2 | 2604 | ecs->ptid = |
47608cb1 | 2605 | deprecated_target_wait_hook (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 2606 | else |
47608cb1 | 2607 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 2608 | |
f00150c9 | 2609 | if (debug_infrun) |
223698f8 | 2610 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 2611 | |
94cc34af PA |
2612 | if (non_stop |
2613 | && ecs->ws.kind != TARGET_WAITKIND_IGNORE | |
2614 | && ecs->ws.kind != TARGET_WAITKIND_EXITED | |
2615 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) | |
2616 | /* In non-stop mode, each thread is handled individually. Switch | |
2617 | early, so the global state is set correctly for this | |
2618 | thread. */ | |
2619 | context_switch (ecs->ptid); | |
2620 | ||
29f49a6a PA |
2621 | /* If an error happens while handling the event, propagate GDB's |
2622 | knowledge of the executing state to the frontend/user running | |
2623 | state. */ | |
2624 | if (!non_stop) | |
2625 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2626 | else | |
2627 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
2628 | ||
43ff13b4 | 2629 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 2630 | handle_inferior_event (ecs); |
43ff13b4 | 2631 | |
a474d7c2 | 2632 | if (!ecs->wait_some_more) |
43ff13b4 | 2633 | { |
d6b48e9c PA |
2634 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); |
2635 | ||
4e1c45ea | 2636 | delete_step_thread_step_resume_breakpoint (); |
f107f563 | 2637 | |
d6b48e9c PA |
2638 | /* We may not find an inferior if this was a process exit. */ |
2639 | if (inf == NULL || inf->stop_soon == NO_STOP_QUIETLY) | |
83c265ab PA |
2640 | normal_stop (); |
2641 | ||
af679fd0 PA |
2642 | if (target_has_execution |
2643 | && ecs->ws.kind != TARGET_WAITKIND_EXITED | |
2644 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
2645 | && ecs->event_thread->step_multi | |
414c69f7 | 2646 | && ecs->event_thread->stop_step) |
c2d11a7d JM |
2647 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); |
2648 | else | |
2649 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 | 2650 | } |
4f8d22e3 | 2651 | |
29f49a6a PA |
2652 | /* No error, don't finish the thread states yet. */ |
2653 | discard_cleanups (ts_old_chain); | |
2654 | ||
4f8d22e3 PA |
2655 | /* Revert thread and frame. */ |
2656 | do_cleanups (old_chain); | |
2657 | ||
2658 | /* If the inferior was in sync execution mode, and now isn't, | |
2659 | restore the prompt. */ | |
2660 | if (was_sync && !sync_execution) | |
2661 | display_gdb_prompt (0); | |
43ff13b4 JM |
2662 | } |
2663 | ||
edb3359d DJ |
2664 | /* Record the frame and location we're currently stepping through. */ |
2665 | void | |
2666 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
2667 | { | |
2668 | struct thread_info *tp = inferior_thread (); | |
2669 | ||
2670 | tp->step_frame_id = get_frame_id (frame); | |
2671 | tp->step_stack_frame_id = get_stack_frame_id (frame); | |
2672 | ||
2673 | tp->current_symtab = sal.symtab; | |
2674 | tp->current_line = sal.line; | |
2675 | } | |
2676 | ||
0d1e5fa7 PA |
2677 | /* Clear context switchable stepping state. */ |
2678 | ||
2679 | void | |
4e1c45ea | 2680 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 PA |
2681 | { |
2682 | tss->stepping_over_breakpoint = 0; | |
2683 | tss->step_after_step_resume_breakpoint = 0; | |
2684 | tss->stepping_through_solib_after_catch = 0; | |
2685 | tss->stepping_through_solib_catchpoints = NULL; | |
cd0fc7c3 SS |
2686 | } |
2687 | ||
e02bc4cc | 2688 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
2689 | target_wait()/deprecated_target_wait_hook(). The data is actually |
2690 | cached by handle_inferior_event(), which gets called immediately | |
2691 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
2692 | |
2693 | void | |
488f131b | 2694 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 2695 | { |
39f77062 | 2696 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
2697 | *status = target_last_waitstatus; |
2698 | } | |
2699 | ||
ac264b3b MS |
2700 | void |
2701 | nullify_last_target_wait_ptid (void) | |
2702 | { | |
2703 | target_last_wait_ptid = minus_one_ptid; | |
2704 | } | |
2705 | ||
dcf4fbde | 2706 | /* Switch thread contexts. */ |
dd80620e MS |
2707 | |
2708 | static void | |
0d1e5fa7 | 2709 | context_switch (ptid_t ptid) |
dd80620e | 2710 | { |
fd48f117 DJ |
2711 | if (debug_infrun) |
2712 | { | |
2713 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
2714 | target_pid_to_str (inferior_ptid)); | |
2715 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 2716 | target_pid_to_str (ptid)); |
fd48f117 DJ |
2717 | } |
2718 | ||
0d1e5fa7 | 2719 | switch_to_thread (ptid); |
dd80620e MS |
2720 | } |
2721 | ||
4fa8626c DJ |
2722 | static void |
2723 | adjust_pc_after_break (struct execution_control_state *ecs) | |
2724 | { | |
24a73cce UW |
2725 | struct regcache *regcache; |
2726 | struct gdbarch *gdbarch; | |
6c95b8df | 2727 | struct address_space *aspace; |
8aad930b | 2728 | CORE_ADDR breakpoint_pc; |
4fa8626c | 2729 | |
4fa8626c DJ |
2730 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
2731 | we aren't, just return. | |
9709f61c DJ |
2732 | |
2733 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
2734 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
2735 | implemented by software breakpoints should be handled through the normal | |
2736 | breakpoint layer. | |
8fb3e588 | 2737 | |
4fa8626c DJ |
2738 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
2739 | different signals (SIGILL or SIGEMT for instance), but it is less | |
2740 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
2741 | gdbarch_decr_pc_after_break. I don't know any specific target that |
2742 | generates these signals at breakpoints (the code has been in GDB since at | |
2743 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 2744 | |
e6cf7916 UW |
2745 | In earlier versions of GDB, a target with |
2746 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
2747 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
2748 | target with both of these set in GDB history, and it seems unlikely to be | |
2749 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c DJ |
2750 | |
2751 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
2752 | return; | |
2753 | ||
2754 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
2755 | return; | |
2756 | ||
4058b839 PA |
2757 | /* In reverse execution, when a breakpoint is hit, the instruction |
2758 | under it has already been de-executed. The reported PC always | |
2759 | points at the breakpoint address, so adjusting it further would | |
2760 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
2761 | architecture: | |
2762 | ||
2763 | B1 0x08000000 : INSN1 | |
2764 | B2 0x08000001 : INSN2 | |
2765 | 0x08000002 : INSN3 | |
2766 | PC -> 0x08000003 : INSN4 | |
2767 | ||
2768 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
2769 | from that point should hit B2 as below. Reading the PC when the | |
2770 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
2771 | been de-executed already. | |
2772 | ||
2773 | B1 0x08000000 : INSN1 | |
2774 | B2 PC -> 0x08000001 : INSN2 | |
2775 | 0x08000002 : INSN3 | |
2776 | 0x08000003 : INSN4 | |
2777 | ||
2778 | We can't apply the same logic as for forward execution, because | |
2779 | we would wrongly adjust the PC to 0x08000000, since there's a | |
2780 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
2781 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
2782 | behaviour. */ | |
2783 | if (execution_direction == EXEC_REVERSE) | |
2784 | return; | |
2785 | ||
24a73cce UW |
2786 | /* If this target does not decrement the PC after breakpoints, then |
2787 | we have nothing to do. */ | |
2788 | regcache = get_thread_regcache (ecs->ptid); | |
2789 | gdbarch = get_regcache_arch (regcache); | |
2790 | if (gdbarch_decr_pc_after_break (gdbarch) == 0) | |
2791 | return; | |
2792 | ||
6c95b8df PA |
2793 | aspace = get_regcache_aspace (regcache); |
2794 | ||
8aad930b AC |
2795 | /* Find the location where (if we've hit a breakpoint) the |
2796 | breakpoint would be. */ | |
515630c5 UW |
2797 | breakpoint_pc = regcache_read_pc (regcache) |
2798 | - gdbarch_decr_pc_after_break (gdbarch); | |
8aad930b | 2799 | |
1c5cfe86 PA |
2800 | /* Check whether there actually is a software breakpoint inserted at |
2801 | that location. | |
2802 | ||
2803 | If in non-stop mode, a race condition is possible where we've | |
2804 | removed a breakpoint, but stop events for that breakpoint were | |
2805 | already queued and arrive later. To suppress those spurious | |
2806 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
2807 | and retire them after a number of stop events are reported. */ | |
6c95b8df PA |
2808 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
2809 | || (non_stop && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 2810 | { |
96429cc8 | 2811 | struct cleanup *old_cleanups = NULL; |
abbb1732 | 2812 | |
96429cc8 HZ |
2813 | if (RECORD_IS_USED) |
2814 | old_cleanups = record_gdb_operation_disable_set (); | |
2815 | ||
1c0fdd0e UW |
2816 | /* When using hardware single-step, a SIGTRAP is reported for both |
2817 | a completed single-step and a software breakpoint. Need to | |
2818 | differentiate between the two, as the latter needs adjusting | |
2819 | but the former does not. | |
2820 | ||
2821 | The SIGTRAP can be due to a completed hardware single-step only if | |
2822 | - we didn't insert software single-step breakpoints | |
2823 | - the thread to be examined is still the current thread | |
2824 | - this thread is currently being stepped | |
2825 | ||
2826 | If any of these events did not occur, we must have stopped due | |
2827 | to hitting a software breakpoint, and have to back up to the | |
2828 | breakpoint address. | |
2829 | ||
2830 | As a special case, we could have hardware single-stepped a | |
2831 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
2832 | we also need to back up to the breakpoint address. */ | |
2833 | ||
2834 | if (singlestep_breakpoints_inserted_p | |
2835 | || !ptid_equal (ecs->ptid, inferior_ptid) | |
4e1c45ea PA |
2836 | || !currently_stepping (ecs->event_thread) |
2837 | || ecs->event_thread->prev_pc == breakpoint_pc) | |
515630c5 | 2838 | regcache_write_pc (regcache, breakpoint_pc); |
96429cc8 HZ |
2839 | |
2840 | if (RECORD_IS_USED) | |
2841 | do_cleanups (old_cleanups); | |
8aad930b | 2842 | } |
4fa8626c DJ |
2843 | } |
2844 | ||
0d1e5fa7 PA |
2845 | void |
2846 | init_infwait_state (void) | |
2847 | { | |
2848 | waiton_ptid = pid_to_ptid (-1); | |
2849 | infwait_state = infwait_normal_state; | |
2850 | } | |
2851 | ||
94cc34af PA |
2852 | void |
2853 | error_is_running (void) | |
2854 | { | |
2855 | error (_("\ | |
2856 | Cannot execute this command while the selected thread is running.")); | |
2857 | } | |
2858 | ||
2859 | void | |
2860 | ensure_not_running (void) | |
2861 | { | |
2862 | if (is_running (inferior_ptid)) | |
2863 | error_is_running (); | |
2864 | } | |
2865 | ||
edb3359d DJ |
2866 | static int |
2867 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
2868 | { | |
2869 | for (frame = get_prev_frame (frame); | |
2870 | frame != NULL; | |
2871 | frame = get_prev_frame (frame)) | |
2872 | { | |
2873 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
2874 | return 1; | |
2875 | if (get_frame_type (frame) != INLINE_FRAME) | |
2876 | break; | |
2877 | } | |
2878 | ||
2879 | return 0; | |
2880 | } | |
2881 | ||
a96d9b2e SDJ |
2882 | /* Auxiliary function that handles syscall entry/return events. |
2883 | It returns 1 if the inferior should keep going (and GDB | |
2884 | should ignore the event), or 0 if the event deserves to be | |
2885 | processed. */ | |
ca2163eb | 2886 | |
a96d9b2e | 2887 | static int |
ca2163eb | 2888 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 2889 | { |
ca2163eb PA |
2890 | struct regcache *regcache; |
2891 | struct gdbarch *gdbarch; | |
2892 | int syscall_number; | |
2893 | ||
2894 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
2895 | context_switch (ecs->ptid); | |
2896 | ||
2897 | regcache = get_thread_regcache (ecs->ptid); | |
2898 | gdbarch = get_regcache_arch (regcache); | |
2899 | syscall_number = gdbarch_get_syscall_number (gdbarch, ecs->ptid); | |
2900 | stop_pc = regcache_read_pc (regcache); | |
2901 | ||
a96d9b2e SDJ |
2902 | target_last_waitstatus.value.syscall_number = syscall_number; |
2903 | ||
2904 | if (catch_syscall_enabled () > 0 | |
2905 | && catching_syscall_number (syscall_number) > 0) | |
2906 | { | |
2907 | if (debug_infrun) | |
2908 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
2909 | syscall_number); | |
a96d9b2e | 2910 | |
6c95b8df PA |
2911 | ecs->event_thread->stop_bpstat |
2912 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
2913 | stop_pc, ecs->ptid); | |
a96d9b2e SDJ |
2914 | ecs->random_signal = !bpstat_explains_signal (ecs->event_thread->stop_bpstat); |
2915 | ||
ca2163eb PA |
2916 | if (!ecs->random_signal) |
2917 | { | |
2918 | /* Catchpoint hit. */ | |
2919 | ecs->event_thread->stop_signal = TARGET_SIGNAL_TRAP; | |
2920 | return 0; | |
2921 | } | |
a96d9b2e | 2922 | } |
ca2163eb PA |
2923 | |
2924 | /* If no catchpoint triggered for this, then keep going. */ | |
2925 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; | |
2926 | keep_going (ecs); | |
2927 | return 1; | |
a96d9b2e SDJ |
2928 | } |
2929 | ||
cd0fc7c3 SS |
2930 | /* Given an execution control state that has been freshly filled in |
2931 | by an event from the inferior, figure out what it means and take | |
2932 | appropriate action. */ | |
c906108c | 2933 | |
ec9499be | 2934 | static void |
96baa820 | 2935 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 2936 | { |
568d6575 UW |
2937 | struct frame_info *frame; |
2938 | struct gdbarch *gdbarch; | |
c8edd8b4 | 2939 | int sw_single_step_trap_p = 0; |
d983da9c DJ |
2940 | int stopped_by_watchpoint; |
2941 | int stepped_after_stopped_by_watchpoint = 0; | |
2afb61aa | 2942 | struct symtab_and_line stop_pc_sal; |
d6b48e9c PA |
2943 | enum stop_kind stop_soon; |
2944 | ||
28736962 PA |
2945 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
2946 | { | |
2947 | /* We had an event in the inferior, but we are not interested in | |
2948 | handling it at this level. The lower layers have already | |
2949 | done what needs to be done, if anything. | |
2950 | ||
2951 | One of the possible circumstances for this is when the | |
2952 | inferior produces output for the console. The inferior has | |
2953 | not stopped, and we are ignoring the event. Another possible | |
2954 | circumstance is any event which the lower level knows will be | |
2955 | reported multiple times without an intervening resume. */ | |
2956 | if (debug_infrun) | |
2957 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
2958 | prepare_to_wait (ecs); | |
2959 | return; | |
2960 | } | |
2961 | ||
d6b48e9c | 2962 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
28736962 | 2963 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
d6b48e9c PA |
2964 | { |
2965 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); | |
abbb1732 | 2966 | |
d6b48e9c PA |
2967 | gdb_assert (inf); |
2968 | stop_soon = inf->stop_soon; | |
2969 | } | |
2970 | else | |
2971 | stop_soon = NO_STOP_QUIETLY; | |
cd0fc7c3 | 2972 | |
e02bc4cc | 2973 | /* Cache the last pid/waitstatus. */ |
39f77062 | 2974 | target_last_wait_ptid = ecs->ptid; |
0d1e5fa7 | 2975 | target_last_waitstatus = ecs->ws; |
e02bc4cc | 2976 | |
ca005067 | 2977 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 2978 | stop_stack_dummy = STOP_NONE; |
ca005067 | 2979 | |
8c90c137 LM |
2980 | /* If it's a new process, add it to the thread database */ |
2981 | ||
2982 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) | |
2983 | && !ptid_equal (ecs->ptid, minus_one_ptid) | |
2984 | && !in_thread_list (ecs->ptid)); | |
2985 | ||
2986 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
2987 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
2988 | add_thread (ecs->ptid); | |
2989 | ||
e09875d4 | 2990 | ecs->event_thread = find_thread_ptid (ecs->ptid); |
88ed393a JK |
2991 | |
2992 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
2993 | adjust_pc_after_break (ecs); | |
2994 | ||
2995 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
2996 | reinit_frame_cache (); | |
2997 | ||
28736962 PA |
2998 | breakpoint_retire_moribund (); |
2999 | ||
2b009048 DJ |
3000 | /* First, distinguish signals caused by the debugger from signals |
3001 | that have to do with the program's own actions. Note that | |
3002 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
3003 | on the operating system version. Here we detect when a SIGILL or | |
3004 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
3005 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
3006 | when we're trying to execute a breakpoint instruction on a | |
3007 | non-executable stack. This happens for call dummy breakpoints | |
3008 | for architectures like SPARC that place call dummies on the | |
3009 | stack. */ | |
2b009048 DJ |
3010 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
3011 | && (ecs->ws.value.sig == TARGET_SIGNAL_ILL | |
3012 | || ecs->ws.value.sig == TARGET_SIGNAL_SEGV | |
de0a0249 | 3013 | || ecs->ws.value.sig == TARGET_SIGNAL_EMT)) |
2b009048 | 3014 | { |
de0a0249 UW |
3015 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
3016 | ||
3017 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
3018 | regcache_read_pc (regcache))) | |
3019 | { | |
3020 | if (debug_infrun) | |
3021 | fprintf_unfiltered (gdb_stdlog, | |
3022 | "infrun: Treating signal as SIGTRAP\n"); | |
3023 | ecs->ws.value.sig = TARGET_SIGNAL_TRAP; | |
3024 | } | |
2b009048 DJ |
3025 | } |
3026 | ||
28736962 PA |
3027 | /* Mark the non-executing threads accordingly. In all-stop, all |
3028 | threads of all processes are stopped when we get any event | |
3029 | reported. In non-stop mode, only the event thread stops. If | |
3030 | we're handling a process exit in non-stop mode, there's nothing | |
3031 | to do, as threads of the dead process are gone, and threads of | |
3032 | any other process were left running. */ | |
3033 | if (!non_stop) | |
3034 | set_executing (minus_one_ptid, 0); | |
3035 | else if (ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
3036 | && ecs->ws.kind != TARGET_WAITKIND_EXITED) | |
3037 | set_executing (inferior_ptid, 0); | |
8c90c137 | 3038 | |
0d1e5fa7 | 3039 | switch (infwait_state) |
488f131b JB |
3040 | { |
3041 | case infwait_thread_hop_state: | |
527159b7 | 3042 | if (debug_infrun) |
8a9de0e4 | 3043 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); |
65e82032 | 3044 | break; |
b83266a0 | 3045 | |
488f131b | 3046 | case infwait_normal_state: |
527159b7 | 3047 | if (debug_infrun) |
8a9de0e4 | 3048 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
d983da9c DJ |
3049 | break; |
3050 | ||
3051 | case infwait_step_watch_state: | |
3052 | if (debug_infrun) | |
3053 | fprintf_unfiltered (gdb_stdlog, | |
3054 | "infrun: infwait_step_watch_state\n"); | |
3055 | ||
3056 | stepped_after_stopped_by_watchpoint = 1; | |
488f131b | 3057 | break; |
b83266a0 | 3058 | |
488f131b | 3059 | case infwait_nonstep_watch_state: |
527159b7 | 3060 | if (debug_infrun) |
8a9de0e4 AC |
3061 | fprintf_unfiltered (gdb_stdlog, |
3062 | "infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 3063 | insert_breakpoints (); |
c906108c | 3064 | |
488f131b JB |
3065 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
3066 | handle things like signals arriving and other things happening | |
3067 | in combination correctly? */ | |
3068 | stepped_after_stopped_by_watchpoint = 1; | |
3069 | break; | |
65e82032 AC |
3070 | |
3071 | default: | |
e2e0b3e5 | 3072 | internal_error (__FILE__, __LINE__, _("bad switch")); |
488f131b | 3073 | } |
ec9499be | 3074 | |
0d1e5fa7 | 3075 | infwait_state = infwait_normal_state; |
ec9499be | 3076 | waiton_ptid = pid_to_ptid (-1); |
c906108c | 3077 | |
488f131b JB |
3078 | switch (ecs->ws.kind) |
3079 | { | |
3080 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 3081 | if (debug_infrun) |
8a9de0e4 | 3082 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
b0f4b84b DJ |
3083 | /* Ignore gracefully during startup of the inferior, as it might |
3084 | be the shell which has just loaded some objects, otherwise | |
3085 | add the symbols for the newly loaded objects. Also ignore at | |
3086 | the beginning of an attach or remote session; we will query | |
3087 | the full list of libraries once the connection is | |
3088 | established. */ | |
c0236d92 | 3089 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 3090 | { |
488f131b JB |
3091 | /* Check for any newly added shared libraries if we're |
3092 | supposed to be adding them automatically. Switch | |
3093 | terminal for any messages produced by | |
3094 | breakpoint_re_set. */ | |
3095 | target_terminal_ours_for_output (); | |
aff6338a | 3096 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
3097 | stack's section table is kept up-to-date. Architectures, |
3098 | (e.g., PPC64), use the section table to perform | |
3099 | operations such as address => section name and hence | |
3100 | require the table to contain all sections (including | |
3101 | those found in shared libraries). */ | |
b0f4b84b | 3102 | #ifdef SOLIB_ADD |
aff6338a | 3103 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
b0f4b84b DJ |
3104 | #else |
3105 | solib_add (NULL, 0, ¤t_target, auto_solib_add); | |
3106 | #endif | |
488f131b JB |
3107 | target_terminal_inferior (); |
3108 | ||
b0f4b84b DJ |
3109 | /* If requested, stop when the dynamic linker notifies |
3110 | gdb of events. This allows the user to get control | |
3111 | and place breakpoints in initializer routines for | |
3112 | dynamically loaded objects (among other things). */ | |
3113 | if (stop_on_solib_events) | |
3114 | { | |
55409f9d DJ |
3115 | /* Make sure we print "Stopped due to solib-event" in |
3116 | normal_stop. */ | |
3117 | stop_print_frame = 1; | |
3118 | ||
b0f4b84b DJ |
3119 | stop_stepping (ecs); |
3120 | return; | |
3121 | } | |
3122 | ||
3123 | /* NOTE drow/2007-05-11: This might be a good place to check | |
3124 | for "catch load". */ | |
488f131b | 3125 | } |
b0f4b84b DJ |
3126 | |
3127 | /* If we are skipping through a shell, or through shared library | |
3128 | loading that we aren't interested in, resume the program. If | |
3129 | we're running the program normally, also resume. But stop if | |
3130 | we're attaching or setting up a remote connection. */ | |
3131 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
3132 | { | |
74960c60 VP |
3133 | /* Loading of shared libraries might have changed breakpoint |
3134 | addresses. Make sure new breakpoints are inserted. */ | |
0b02b92d UW |
3135 | if (stop_soon == NO_STOP_QUIETLY |
3136 | && !breakpoints_always_inserted_mode ()) | |
74960c60 | 3137 | insert_breakpoints (); |
b0f4b84b DJ |
3138 | resume (0, TARGET_SIGNAL_0); |
3139 | prepare_to_wait (ecs); | |
3140 | return; | |
3141 | } | |
3142 | ||
3143 | break; | |
c5aa993b | 3144 | |
488f131b | 3145 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 3146 | if (debug_infrun) |
8a9de0e4 | 3147 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
488f131b JB |
3148 | resume (0, TARGET_SIGNAL_0); |
3149 | prepare_to_wait (ecs); | |
3150 | return; | |
c5aa993b | 3151 | |
488f131b | 3152 | case TARGET_WAITKIND_EXITED: |
527159b7 | 3153 | if (debug_infrun) |
8a9de0e4 | 3154 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n"); |
fb66883a | 3155 | inferior_ptid = ecs->ptid; |
6c95b8df PA |
3156 | set_current_inferior (find_inferior_pid (ptid_get_pid (ecs->ptid))); |
3157 | set_current_program_space (current_inferior ()->pspace); | |
3158 | handle_vfork_child_exec_or_exit (0); | |
488f131b JB |
3159 | target_terminal_ours (); /* Must do this before mourn anyway */ |
3160 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
3161 | ||
3162 | /* Record the exit code in the convenience variable $_exitcode, so | |
3163 | that the user can inspect this again later. */ | |
4fa62494 UW |
3164 | set_internalvar_integer (lookup_internalvar ("_exitcode"), |
3165 | (LONGEST) ecs->ws.value.integer); | |
488f131b JB |
3166 | gdb_flush (gdb_stdout); |
3167 | target_mourn_inferior (); | |
1c0fdd0e | 3168 | singlestep_breakpoints_inserted_p = 0; |
d03285ec | 3169 | cancel_single_step_breakpoints (); |
488f131b JB |
3170 | stop_print_frame = 0; |
3171 | stop_stepping (ecs); | |
3172 | return; | |
c5aa993b | 3173 | |
488f131b | 3174 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 3175 | if (debug_infrun) |
8a9de0e4 | 3176 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n"); |
fb66883a | 3177 | inferior_ptid = ecs->ptid; |
6c95b8df PA |
3178 | set_current_inferior (find_inferior_pid (ptid_get_pid (ecs->ptid))); |
3179 | set_current_program_space (current_inferior ()->pspace); | |
3180 | handle_vfork_child_exec_or_exit (0); | |
488f131b | 3181 | stop_print_frame = 0; |
488f131b | 3182 | target_terminal_ours (); /* Must do this before mourn anyway */ |
c5aa993b | 3183 | |
488f131b JB |
3184 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
3185 | reach here unless the inferior is dead. However, for years | |
3186 | target_kill() was called here, which hints that fatal signals aren't | |
3187 | really fatal on some systems. If that's true, then some changes | |
3188 | may be needed. */ | |
3189 | target_mourn_inferior (); | |
c906108c | 3190 | |
2020b7ab | 3191 | print_stop_reason (SIGNAL_EXITED, ecs->ws.value.sig); |
1c0fdd0e | 3192 | singlestep_breakpoints_inserted_p = 0; |
d03285ec | 3193 | cancel_single_step_breakpoints (); |
488f131b JB |
3194 | stop_stepping (ecs); |
3195 | return; | |
c906108c | 3196 | |
488f131b JB |
3197 | /* The following are the only cases in which we keep going; |
3198 | the above cases end in a continue or goto. */ | |
3199 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 3200 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 3201 | if (debug_infrun) |
8a9de0e4 | 3202 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); |
c906108c | 3203 | |
5a2901d9 DJ |
3204 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3205 | { | |
0d1e5fa7 | 3206 | context_switch (ecs->ptid); |
35f196d9 | 3207 | reinit_frame_cache (); |
5a2901d9 DJ |
3208 | } |
3209 | ||
b242c3c2 PA |
3210 | /* Immediately detach breakpoints from the child before there's |
3211 | any chance of letting the user delete breakpoints from the | |
3212 | breakpoint lists. If we don't do this early, it's easy to | |
3213 | leave left over traps in the child, vis: "break foo; catch | |
3214 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
3215 | the fork on the last `continue', and by that time the | |
3216 | breakpoint at "foo" is long gone from the breakpoint table. | |
3217 | If we vforked, then we don't need to unpatch here, since both | |
3218 | parent and child are sharing the same memory pages; we'll | |
3219 | need to unpatch at follow/detach time instead to be certain | |
3220 | that new breakpoints added between catchpoint hit time and | |
3221 | vfork follow are detached. */ | |
3222 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
3223 | { | |
3224 | int child_pid = ptid_get_pid (ecs->ws.value.related_pid); | |
3225 | ||
3226 | /* This won't actually modify the breakpoint list, but will | |
3227 | physically remove the breakpoints from the child. */ | |
3228 | detach_breakpoints (child_pid); | |
3229 | } | |
3230 | ||
d03285ec UW |
3231 | if (singlestep_breakpoints_inserted_p) |
3232 | { | |
3233 | /* Pull the single step breakpoints out of the target. */ | |
3234 | remove_single_step_breakpoints (); | |
3235 | singlestep_breakpoints_inserted_p = 0; | |
3236 | } | |
3237 | ||
e58b0e63 PA |
3238 | /* In case the event is caught by a catchpoint, remember that |
3239 | the event is to be followed at the next resume of the thread, | |
3240 | and not immediately. */ | |
3241 | ecs->event_thread->pending_follow = ecs->ws; | |
3242 | ||
fb14de7b | 3243 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 3244 | |
6c95b8df PA |
3245 | ecs->event_thread->stop_bpstat |
3246 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
3247 | stop_pc, ecs->ptid); | |
675bf4cb | 3248 | |
67822962 PA |
3249 | /* Note that we're interested in knowing the bpstat actually |
3250 | causes a stop, not just if it may explain the signal. | |
3251 | Software watchpoints, for example, always appear in the | |
3252 | bpstat. */ | |
3253 | ecs->random_signal = !bpstat_causes_stop (ecs->event_thread->stop_bpstat); | |
04e68871 DJ |
3254 | |
3255 | /* If no catchpoint triggered for this, then keep going. */ | |
3256 | if (ecs->random_signal) | |
3257 | { | |
6c95b8df PA |
3258 | ptid_t parent; |
3259 | ptid_t child; | |
e58b0e63 | 3260 | int should_resume; |
6c95b8df | 3261 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 3262 | |
2020b7ab | 3263 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; |
e58b0e63 PA |
3264 | |
3265 | should_resume = follow_fork (); | |
3266 | ||
6c95b8df PA |
3267 | parent = ecs->ptid; |
3268 | child = ecs->ws.value.related_pid; | |
3269 | ||
3270 | /* In non-stop mode, also resume the other branch. */ | |
3271 | if (non_stop && !detach_fork) | |
3272 | { | |
3273 | if (follow_child) | |
3274 | switch_to_thread (parent); | |
3275 | else | |
3276 | switch_to_thread (child); | |
3277 | ||
3278 | ecs->event_thread = inferior_thread (); | |
3279 | ecs->ptid = inferior_ptid; | |
3280 | keep_going (ecs); | |
3281 | } | |
3282 | ||
3283 | if (follow_child) | |
3284 | switch_to_thread (child); | |
3285 | else | |
3286 | switch_to_thread (parent); | |
3287 | ||
e58b0e63 PA |
3288 | ecs->event_thread = inferior_thread (); |
3289 | ecs->ptid = inferior_ptid; | |
3290 | ||
3291 | if (should_resume) | |
3292 | keep_going (ecs); | |
3293 | else | |
3294 | stop_stepping (ecs); | |
04e68871 DJ |
3295 | return; |
3296 | } | |
2020b7ab | 3297 | ecs->event_thread->stop_signal = TARGET_SIGNAL_TRAP; |
488f131b JB |
3298 | goto process_event_stop_test; |
3299 | ||
6c95b8df PA |
3300 | case TARGET_WAITKIND_VFORK_DONE: |
3301 | /* Done with the shared memory region. Re-insert breakpoints in | |
3302 | the parent, and keep going. */ | |
3303 | ||
3304 | if (debug_infrun) | |
3305 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
3306 | ||
3307 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3308 | context_switch (ecs->ptid); | |
3309 | ||
3310 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 3311 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
6c95b8df PA |
3312 | /* This also takes care of reinserting breakpoints in the |
3313 | previously locked inferior. */ | |
3314 | keep_going (ecs); | |
3315 | return; | |
3316 | ||
488f131b | 3317 | case TARGET_WAITKIND_EXECD: |
527159b7 | 3318 | if (debug_infrun) |
fc5261f2 | 3319 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 3320 | |
5a2901d9 DJ |
3321 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3322 | { | |
0d1e5fa7 | 3323 | context_switch (ecs->ptid); |
35f196d9 | 3324 | reinit_frame_cache (); |
5a2901d9 DJ |
3325 | } |
3326 | ||
d03285ec UW |
3327 | singlestep_breakpoints_inserted_p = 0; |
3328 | cancel_single_step_breakpoints (); | |
3329 | ||
fb14de7b | 3330 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
795e548f | 3331 | |
6c95b8df PA |
3332 | /* Do whatever is necessary to the parent branch of the vfork. */ |
3333 | handle_vfork_child_exec_or_exit (1); | |
3334 | ||
795e548f PA |
3335 | /* This causes the eventpoints and symbol table to be reset. |
3336 | Must do this now, before trying to determine whether to | |
3337 | stop. */ | |
71b43ef8 | 3338 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 3339 | |
6c95b8df PA |
3340 | ecs->event_thread->stop_bpstat |
3341 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
3342 | stop_pc, ecs->ptid); | |
795e548f PA |
3343 | ecs->random_signal = !bpstat_explains_signal (ecs->event_thread->stop_bpstat); |
3344 | ||
71b43ef8 PA |
3345 | /* Note that this may be referenced from inside |
3346 | bpstat_stop_status above, through inferior_has_execd. */ | |
3347 | xfree (ecs->ws.value.execd_pathname); | |
3348 | ecs->ws.value.execd_pathname = NULL; | |
3349 | ||
04e68871 DJ |
3350 | /* If no catchpoint triggered for this, then keep going. */ |
3351 | if (ecs->random_signal) | |
3352 | { | |
2020b7ab | 3353 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; |
04e68871 DJ |
3354 | keep_going (ecs); |
3355 | return; | |
3356 | } | |
2020b7ab | 3357 | ecs->event_thread->stop_signal = TARGET_SIGNAL_TRAP; |
488f131b JB |
3358 | goto process_event_stop_test; |
3359 | ||
b4dc5ffa MK |
3360 | /* Be careful not to try to gather much state about a thread |
3361 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 3362 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 3363 | if (debug_infrun) |
8a9de0e4 | 3364 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); |
a96d9b2e | 3365 | /* Getting the current syscall number */ |
ca2163eb | 3366 | if (handle_syscall_event (ecs) != 0) |
a96d9b2e SDJ |
3367 | return; |
3368 | goto process_event_stop_test; | |
c906108c | 3369 | |
488f131b JB |
3370 | /* Before examining the threads further, step this thread to |
3371 | get it entirely out of the syscall. (We get notice of the | |
3372 | event when the thread is just on the verge of exiting a | |
3373 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 3374 | into user code.) */ |
488f131b | 3375 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 3376 | if (debug_infrun) |
8a9de0e4 | 3377 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); |
ca2163eb | 3378 | if (handle_syscall_event (ecs) != 0) |
a96d9b2e SDJ |
3379 | return; |
3380 | goto process_event_stop_test; | |
c906108c | 3381 | |
488f131b | 3382 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 3383 | if (debug_infrun) |
8a9de0e4 | 3384 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
2020b7ab | 3385 | ecs->event_thread->stop_signal = ecs->ws.value.sig; |
488f131b | 3386 | break; |
c906108c | 3387 | |
b2175913 MS |
3388 | case TARGET_WAITKIND_NO_HISTORY: |
3389 | /* Reverse execution: target ran out of history info. */ | |
fb14de7b | 3390 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
b2175913 MS |
3391 | print_stop_reason (NO_HISTORY, 0); |
3392 | stop_stepping (ecs); | |
3393 | return; | |
488f131b | 3394 | } |
c906108c | 3395 | |
488f131b JB |
3396 | if (ecs->new_thread_event) |
3397 | { | |
94cc34af PA |
3398 | if (non_stop) |
3399 | /* Non-stop assumes that the target handles adding new threads | |
3400 | to the thread list. */ | |
3401 | internal_error (__FILE__, __LINE__, "\ | |
3402 | targets should add new threads to the thread list themselves in non-stop mode."); | |
3403 | ||
3404 | /* We may want to consider not doing a resume here in order to | |
3405 | give the user a chance to play with the new thread. It might | |
3406 | be good to make that a user-settable option. */ | |
3407 | ||
3408 | /* At this point, all threads are stopped (happens automatically | |
3409 | in either the OS or the native code). Therefore we need to | |
3410 | continue all threads in order to make progress. */ | |
3411 | ||
173853dc PA |
3412 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3413 | context_switch (ecs->ptid); | |
488f131b JB |
3414 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); |
3415 | prepare_to_wait (ecs); | |
3416 | return; | |
3417 | } | |
c906108c | 3418 | |
2020b7ab | 3419 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED) |
252fbfc8 PA |
3420 | { |
3421 | /* Do we need to clean up the state of a thread that has | |
3422 | completed a displaced single-step? (Doing so usually affects | |
3423 | the PC, so do it here, before we set stop_pc.) */ | |
3424 | displaced_step_fixup (ecs->ptid, ecs->event_thread->stop_signal); | |
3425 | ||
3426 | /* If we either finished a single-step or hit a breakpoint, but | |
3427 | the user wanted this thread to be stopped, pretend we got a | |
3428 | SIG0 (generic unsignaled stop). */ | |
3429 | ||
3430 | if (ecs->event_thread->stop_requested | |
3431 | && ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP) | |
3432 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; | |
3433 | } | |
237fc4c9 | 3434 | |
515630c5 | 3435 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 3436 | |
527159b7 | 3437 | if (debug_infrun) |
237fc4c9 | 3438 | { |
5af949e3 UW |
3439 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
3440 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7f82dfc7 JK |
3441 | struct cleanup *old_chain = save_inferior_ptid (); |
3442 | ||
3443 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
3444 | |
3445 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
3446 | paddress (gdbarch, stop_pc)); | |
d92524f1 | 3447 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
3448 | { |
3449 | CORE_ADDR addr; | |
abbb1732 | 3450 | |
237fc4c9 PA |
3451 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
3452 | ||
3453 | if (target_stopped_data_address (¤t_target, &addr)) | |
3454 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
3455 | "infrun: stopped data address = %s\n", |
3456 | paddress (gdbarch, addr)); | |
237fc4c9 PA |
3457 | else |
3458 | fprintf_unfiltered (gdb_stdlog, | |
3459 | "infrun: (no data address available)\n"); | |
3460 | } | |
7f82dfc7 JK |
3461 | |
3462 | do_cleanups (old_chain); | |
237fc4c9 | 3463 | } |
527159b7 | 3464 | |
9f976b41 DJ |
3465 | if (stepping_past_singlestep_breakpoint) |
3466 | { | |
1c0fdd0e | 3467 | gdb_assert (singlestep_breakpoints_inserted_p); |
9f976b41 DJ |
3468 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
3469 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
3470 | ||
3471 | stepping_past_singlestep_breakpoint = 0; | |
3472 | ||
3473 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
3474 | breakpoint, or stopped for some other reason. It would be nice if |
3475 | we could tell, but we can't reliably. */ | |
2020b7ab | 3476 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP) |
8fb3e588 | 3477 | { |
527159b7 | 3478 | if (debug_infrun) |
8a9de0e4 | 3479 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n"); |
9f976b41 | 3480 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 3481 | remove_single_step_breakpoints (); |
9f976b41 DJ |
3482 | singlestep_breakpoints_inserted_p = 0; |
3483 | ||
3484 | ecs->random_signal = 0; | |
79626f8a | 3485 | ecs->event_thread->trap_expected = 0; |
9f976b41 | 3486 | |
0d1e5fa7 | 3487 | context_switch (saved_singlestep_ptid); |
9a4105ab AC |
3488 | if (deprecated_context_hook) |
3489 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
3490 | |
3491 | resume (1, TARGET_SIGNAL_0); | |
3492 | prepare_to_wait (ecs); | |
3493 | return; | |
3494 | } | |
3495 | } | |
3496 | ||
ca67fcb8 | 3497 | if (!ptid_equal (deferred_step_ptid, null_ptid)) |
6a6b96b9 | 3498 | { |
94cc34af PA |
3499 | /* In non-stop mode, there's never a deferred_step_ptid set. */ |
3500 | gdb_assert (!non_stop); | |
3501 | ||
6a6b96b9 UW |
3502 | /* If we stopped for some other reason than single-stepping, ignore |
3503 | the fact that we were supposed to switch back. */ | |
2020b7ab | 3504 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP) |
6a6b96b9 UW |
3505 | { |
3506 | if (debug_infrun) | |
3507 | fprintf_unfiltered (gdb_stdlog, | |
ca67fcb8 | 3508 | "infrun: handling deferred step\n"); |
6a6b96b9 UW |
3509 | |
3510 | /* Pull the single step breakpoints out of the target. */ | |
3511 | if (singlestep_breakpoints_inserted_p) | |
3512 | { | |
3513 | remove_single_step_breakpoints (); | |
3514 | singlestep_breakpoints_inserted_p = 0; | |
3515 | } | |
3516 | ||
3517 | /* Note: We do not call context_switch at this point, as the | |
3518 | context is already set up for stepping the original thread. */ | |
ca67fcb8 VP |
3519 | switch_to_thread (deferred_step_ptid); |
3520 | deferred_step_ptid = null_ptid; | |
6a6b96b9 UW |
3521 | /* Suppress spurious "Switching to ..." message. */ |
3522 | previous_inferior_ptid = inferior_ptid; | |
3523 | ||
3524 | resume (1, TARGET_SIGNAL_0); | |
3525 | prepare_to_wait (ecs); | |
3526 | return; | |
3527 | } | |
ca67fcb8 VP |
3528 | |
3529 | deferred_step_ptid = null_ptid; | |
6a6b96b9 UW |
3530 | } |
3531 | ||
488f131b JB |
3532 | /* See if a thread hit a thread-specific breakpoint that was meant for |
3533 | another thread. If so, then step that thread past the breakpoint, | |
3534 | and continue it. */ | |
3535 | ||
2020b7ab | 3536 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP) |
488f131b | 3537 | { |
9f976b41 | 3538 | int thread_hop_needed = 0; |
cf00dfa7 VP |
3539 | struct address_space *aspace = |
3540 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
9f976b41 | 3541 | |
f8d40ec8 JB |
3542 | /* Check if a regular breakpoint has been hit before checking |
3543 | for a potential single step breakpoint. Otherwise, GDB will | |
3544 | not see this breakpoint hit when stepping onto breakpoints. */ | |
6c95b8df | 3545 | if (regular_breakpoint_inserted_here_p (aspace, stop_pc)) |
488f131b | 3546 | { |
c5aa993b | 3547 | ecs->random_signal = 0; |
6c95b8df | 3548 | if (!breakpoint_thread_match (aspace, stop_pc, ecs->ptid)) |
9f976b41 DJ |
3549 | thread_hop_needed = 1; |
3550 | } | |
1c0fdd0e | 3551 | else if (singlestep_breakpoints_inserted_p) |
9f976b41 | 3552 | { |
fd48f117 DJ |
3553 | /* We have not context switched yet, so this should be true |
3554 | no matter which thread hit the singlestep breakpoint. */ | |
3555 | gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid)); | |
3556 | if (debug_infrun) | |
3557 | fprintf_unfiltered (gdb_stdlog, "infrun: software single step " | |
3558 | "trap for %s\n", | |
3559 | target_pid_to_str (ecs->ptid)); | |
3560 | ||
9f976b41 DJ |
3561 | ecs->random_signal = 0; |
3562 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
3563 | change when we go from single-threaded to multi-threaded. If | |
3564 | the singlestep_ptid is still in the list, assume that it is | |
3565 | really different from ecs->ptid. */ | |
3566 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
3567 | && in_thread_list (singlestep_ptid)) | |
3568 | { | |
fd48f117 DJ |
3569 | /* If the PC of the thread we were trying to single-step |
3570 | has changed, discard this event (which we were going | |
3571 | to ignore anyway), and pretend we saw that thread | |
3572 | trap. This prevents us continuously moving the | |
3573 | single-step breakpoint forward, one instruction at a | |
3574 | time. If the PC has changed, then the thread we were | |
3575 | trying to single-step has trapped or been signalled, | |
3576 | but the event has not been reported to GDB yet. | |
3577 | ||
3578 | There might be some cases where this loses signal | |
3579 | information, if a signal has arrived at exactly the | |
3580 | same time that the PC changed, but this is the best | |
3581 | we can do with the information available. Perhaps we | |
3582 | should arrange to report all events for all threads | |
3583 | when they stop, or to re-poll the remote looking for | |
3584 | this particular thread (i.e. temporarily enable | |
3585 | schedlock). */ | |
515630c5 UW |
3586 | |
3587 | CORE_ADDR new_singlestep_pc | |
3588 | = regcache_read_pc (get_thread_regcache (singlestep_ptid)); | |
3589 | ||
3590 | if (new_singlestep_pc != singlestep_pc) | |
fd48f117 | 3591 | { |
2020b7ab PA |
3592 | enum target_signal stop_signal; |
3593 | ||
fd48f117 DJ |
3594 | if (debug_infrun) |
3595 | fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread," | |
3596 | " but expected thread advanced also\n"); | |
3597 | ||
3598 | /* The current context still belongs to | |
3599 | singlestep_ptid. Don't swap here, since that's | |
3600 | the context we want to use. Just fudge our | |
3601 | state and continue. */ | |
2020b7ab PA |
3602 | stop_signal = ecs->event_thread->stop_signal; |
3603 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; | |
fd48f117 | 3604 | ecs->ptid = singlestep_ptid; |
e09875d4 | 3605 | ecs->event_thread = find_thread_ptid (ecs->ptid); |
2020b7ab | 3606 | ecs->event_thread->stop_signal = stop_signal; |
515630c5 | 3607 | stop_pc = new_singlestep_pc; |
fd48f117 DJ |
3608 | } |
3609 | else | |
3610 | { | |
3611 | if (debug_infrun) | |
3612 | fprintf_unfiltered (gdb_stdlog, | |
3613 | "infrun: unexpected thread\n"); | |
3614 | ||
3615 | thread_hop_needed = 1; | |
3616 | stepping_past_singlestep_breakpoint = 1; | |
3617 | saved_singlestep_ptid = singlestep_ptid; | |
3618 | } | |
9f976b41 DJ |
3619 | } |
3620 | } | |
3621 | ||
3622 | if (thread_hop_needed) | |
8fb3e588 | 3623 | { |
9f5a595d | 3624 | struct regcache *thread_regcache; |
237fc4c9 | 3625 | int remove_status = 0; |
8fb3e588 | 3626 | |
527159b7 | 3627 | if (debug_infrun) |
8a9de0e4 | 3628 | fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); |
527159b7 | 3629 | |
b3444185 PA |
3630 | /* Switch context before touching inferior memory, the |
3631 | previous thread may have exited. */ | |
3632 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
3633 | context_switch (ecs->ptid); | |
3634 | ||
8fb3e588 AC |
3635 | /* Saw a breakpoint, but it was hit by the wrong thread. |
3636 | Just continue. */ | |
3637 | ||
1c0fdd0e | 3638 | if (singlestep_breakpoints_inserted_p) |
488f131b | 3639 | { |
8fb3e588 | 3640 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 3641 | remove_single_step_breakpoints (); |
8fb3e588 AC |
3642 | singlestep_breakpoints_inserted_p = 0; |
3643 | } | |
3644 | ||
237fc4c9 PA |
3645 | /* If the arch can displace step, don't remove the |
3646 | breakpoints. */ | |
9f5a595d UW |
3647 | thread_regcache = get_thread_regcache (ecs->ptid); |
3648 | if (!use_displaced_stepping (get_regcache_arch (thread_regcache))) | |
237fc4c9 PA |
3649 | remove_status = remove_breakpoints (); |
3650 | ||
8fb3e588 AC |
3651 | /* Did we fail to remove breakpoints? If so, try |
3652 | to set the PC past the bp. (There's at least | |
3653 | one situation in which we can fail to remove | |
3654 | the bp's: On HP-UX's that use ttrace, we can't | |
3655 | change the address space of a vforking child | |
3656 | process until the child exits (well, okay, not | |
3657 | then either :-) or execs. */ | |
3658 | if (remove_status != 0) | |
9d9cd7ac | 3659 | error (_("Cannot step over breakpoint hit in wrong thread")); |
8fb3e588 AC |
3660 | else |
3661 | { /* Single step */ | |
94cc34af PA |
3662 | if (!non_stop) |
3663 | { | |
3664 | /* Only need to require the next event from this | |
3665 | thread in all-stop mode. */ | |
3666 | waiton_ptid = ecs->ptid; | |
3667 | infwait_state = infwait_thread_hop_state; | |
3668 | } | |
8fb3e588 | 3669 | |
4e1c45ea | 3670 | ecs->event_thread->stepping_over_breakpoint = 1; |
8fb3e588 | 3671 | keep_going (ecs); |
8fb3e588 AC |
3672 | return; |
3673 | } | |
488f131b | 3674 | } |
1c0fdd0e | 3675 | else if (singlestep_breakpoints_inserted_p) |
8fb3e588 AC |
3676 | { |
3677 | sw_single_step_trap_p = 1; | |
3678 | ecs->random_signal = 0; | |
3679 | } | |
488f131b JB |
3680 | } |
3681 | else | |
3682 | ecs->random_signal = 1; | |
c906108c | 3683 | |
488f131b | 3684 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
3685 | so, then switch to that thread. */ |
3686 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 3687 | { |
527159b7 | 3688 | if (debug_infrun) |
8a9de0e4 | 3689 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 3690 | |
0d1e5fa7 | 3691 | context_switch (ecs->ptid); |
c5aa993b | 3692 | |
9a4105ab AC |
3693 | if (deprecated_context_hook) |
3694 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 3695 | } |
c906108c | 3696 | |
568d6575 UW |
3697 | /* At this point, get hold of the now-current thread's frame. */ |
3698 | frame = get_current_frame (); | |
3699 | gdbarch = get_frame_arch (frame); | |
3700 | ||
1c0fdd0e | 3701 | if (singlestep_breakpoints_inserted_p) |
488f131b JB |
3702 | { |
3703 | /* Pull the single step breakpoints out of the target. */ | |
e0cd558a | 3704 | remove_single_step_breakpoints (); |
488f131b JB |
3705 | singlestep_breakpoints_inserted_p = 0; |
3706 | } | |
c906108c | 3707 | |
d983da9c DJ |
3708 | if (stepped_after_stopped_by_watchpoint) |
3709 | stopped_by_watchpoint = 0; | |
3710 | else | |
3711 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
3712 | ||
3713 | /* If necessary, step over this watchpoint. We'll be back to display | |
3714 | it in a moment. */ | |
3715 | if (stopped_by_watchpoint | |
d92524f1 | 3716 | && (target_have_steppable_watchpoint |
568d6575 | 3717 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 3718 | { |
488f131b JB |
3719 | /* At this point, we are stopped at an instruction which has |
3720 | attempted to write to a piece of memory under control of | |
3721 | a watchpoint. The instruction hasn't actually executed | |
3722 | yet. If we were to evaluate the watchpoint expression | |
3723 | now, we would get the old value, and therefore no change | |
3724 | would seem to have occurred. | |
3725 | ||
3726 | In order to make watchpoints work `right', we really need | |
3727 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
3728 | watchpoint expression. We do this by single-stepping the |
3729 | target. | |
3730 | ||
3731 | It may not be necessary to disable the watchpoint to stop over | |
3732 | it. For example, the PA can (with some kernel cooperation) | |
3733 | single step over a watchpoint without disabling the watchpoint. | |
3734 | ||
3735 | It is far more common to need to disable a watchpoint to step | |
3736 | the inferior over it. If we have non-steppable watchpoints, | |
3737 | we must disable the current watchpoint; it's simplest to | |
3738 | disable all watchpoints and breakpoints. */ | |
2facfe5c DD |
3739 | int hw_step = 1; |
3740 | ||
d92524f1 | 3741 | if (!target_have_steppable_watchpoint) |
d983da9c | 3742 | remove_breakpoints (); |
2facfe5c | 3743 | /* Single step */ |
568d6575 | 3744 | hw_step = maybe_software_singlestep (gdbarch, stop_pc); |
2facfe5c | 3745 | target_resume (ecs->ptid, hw_step, TARGET_SIGNAL_0); |
0d1e5fa7 | 3746 | waiton_ptid = ecs->ptid; |
d92524f1 | 3747 | if (target_have_steppable_watchpoint) |
0d1e5fa7 | 3748 | infwait_state = infwait_step_watch_state; |
d983da9c | 3749 | else |
0d1e5fa7 | 3750 | infwait_state = infwait_nonstep_watch_state; |
488f131b JB |
3751 | prepare_to_wait (ecs); |
3752 | return; | |
3753 | } | |
3754 | ||
488f131b JB |
3755 | ecs->stop_func_start = 0; |
3756 | ecs->stop_func_end = 0; | |
3757 | ecs->stop_func_name = 0; | |
3758 | /* Don't care about return value; stop_func_start and stop_func_name | |
3759 | will both be 0 if it doesn't work. */ | |
3760 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
3761 | &ecs->stop_func_start, &ecs->stop_func_end); | |
cbf3b44a | 3762 | ecs->stop_func_start |
568d6575 | 3763 | += gdbarch_deprecated_function_start_offset (gdbarch); |
4e1c45ea | 3764 | ecs->event_thread->stepping_over_breakpoint = 0; |
347bddb7 | 3765 | bpstat_clear (&ecs->event_thread->stop_bpstat); |
414c69f7 | 3766 | ecs->event_thread->stop_step = 0; |
488f131b JB |
3767 | stop_print_frame = 1; |
3768 | ecs->random_signal = 0; | |
3769 | stopped_by_random_signal = 0; | |
488f131b | 3770 | |
edb3359d DJ |
3771 | /* Hide inlined functions starting here, unless we just performed stepi or |
3772 | nexti. After stepi and nexti, always show the innermost frame (not any | |
3773 | inline function call sites). */ | |
3774 | if (ecs->event_thread->step_range_end != 1) | |
3775 | skip_inline_frames (ecs->ptid); | |
3776 | ||
2020b7ab | 3777 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP |
4e1c45ea | 3778 | && ecs->event_thread->trap_expected |
568d6575 | 3779 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 3780 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 3781 | { |
b50d7442 | 3782 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 AC |
3783 | also on an instruction that needs to be stepped multiple |
3784 | times before it's been fully executing. E.g., architectures | |
3785 | with a delay slot. It needs to be stepped twice, once for | |
3786 | the instruction and once for the delay slot. */ | |
3787 | int step_through_delay | |
568d6575 | 3788 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 3789 | |
527159b7 | 3790 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 3791 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
4e1c45ea | 3792 | if (ecs->event_thread->step_range_end == 0 && step_through_delay) |
3352ef37 AC |
3793 | { |
3794 | /* The user issued a continue when stopped at a breakpoint. | |
3795 | Set up for another trap and get out of here. */ | |
4e1c45ea | 3796 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
3797 | keep_going (ecs); |
3798 | return; | |
3799 | } | |
3800 | else if (step_through_delay) | |
3801 | { | |
3802 | /* The user issued a step when stopped at a breakpoint. | |
3803 | Maybe we should stop, maybe we should not - the delay | |
3804 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
3805 | case, don't decide that here, just set |
3806 | ecs->stepping_over_breakpoint, making sure we | |
3807 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 3808 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
3809 | } |
3810 | } | |
3811 | ||
488f131b JB |
3812 | /* Look at the cause of the stop, and decide what to do. |
3813 | The alternatives are: | |
0d1e5fa7 PA |
3814 | 1) stop_stepping and return; to really stop and return to the debugger, |
3815 | 2) keep_going and return to start up again | |
4e1c45ea | 3816 | (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once) |
488f131b JB |
3817 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 |
3818 | will be made according to the signal handling tables. */ | |
3819 | ||
2020b7ab | 3820 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP |
b0f4b84b DJ |
3821 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP |
3822 | || stop_soon == STOP_QUIETLY_REMOTE) | |
488f131b | 3823 | { |
2020b7ab | 3824 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) |
488f131b | 3825 | { |
527159b7 | 3826 | if (debug_infrun) |
8a9de0e4 | 3827 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); |
488f131b JB |
3828 | stop_print_frame = 0; |
3829 | stop_stepping (ecs); | |
3830 | return; | |
3831 | } | |
c54cfec8 EZ |
3832 | |
3833 | /* This is originated from start_remote(), start_inferior() and | |
3834 | shared libraries hook functions. */ | |
b0f4b84b | 3835 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
488f131b | 3836 | { |
527159b7 | 3837 | if (debug_infrun) |
8a9de0e4 | 3838 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); |
488f131b JB |
3839 | stop_stepping (ecs); |
3840 | return; | |
3841 | } | |
3842 | ||
c54cfec8 | 3843 | /* This originates from attach_command(). We need to overwrite |
a0d21d28 PA |
3844 | the stop_signal here, because some kernels don't ignore a |
3845 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
3846 | See more comments in inferior.h. On the other hand, if we | |
a0ef4274 | 3847 | get a non-SIGSTOP, report it to the user - assume the backend |
a0d21d28 PA |
3848 | will handle the SIGSTOP if it should show up later. |
3849 | ||
3850 | Also consider that the attach is complete when we see a | |
3851 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
3852 | target extended-remote report it instead of a SIGSTOP | |
3853 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
e0ba6746 PA |
3854 | signal, so this is no exception. |
3855 | ||
3856 | Also consider that the attach is complete when we see a | |
3857 | TARGET_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
3858 | the target to stop all threads of the inferior, in case the | |
3859 | low level attach operation doesn't stop them implicitly. If | |
3860 | they weren't stopped implicitly, then the stub will report a | |
3861 | TARGET_SIGNAL_0, meaning: stopped for no particular reason | |
3862 | other than GDB's request. */ | |
a0ef4274 | 3863 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP |
2020b7ab | 3864 | && (ecs->event_thread->stop_signal == TARGET_SIGNAL_STOP |
e0ba6746 PA |
3865 | || ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP |
3866 | || ecs->event_thread->stop_signal == TARGET_SIGNAL_0)) | |
c54cfec8 EZ |
3867 | { |
3868 | stop_stepping (ecs); | |
2020b7ab | 3869 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; |
c54cfec8 EZ |
3870 | return; |
3871 | } | |
3872 | ||
fba57f8f | 3873 | /* See if there is a breakpoint at the current PC. */ |
6c95b8df PA |
3874 | ecs->event_thread->stop_bpstat |
3875 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
3876 | stop_pc, ecs->ptid); | |
3877 | ||
fba57f8f VP |
3878 | /* Following in case break condition called a |
3879 | function. */ | |
3880 | stop_print_frame = 1; | |
488f131b | 3881 | |
db82e815 PA |
3882 | /* This is where we handle "moribund" watchpoints. Unlike |
3883 | software breakpoints traps, hardware watchpoint traps are | |
3884 | always distinguishable from random traps. If no high-level | |
3885 | watchpoint is associated with the reported stop data address | |
3886 | anymore, then the bpstat does not explain the signal --- | |
3887 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
3888 | set. */ | |
3889 | ||
3890 | if (debug_infrun | |
3891 | && ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP | |
3892 | && !bpstat_explains_signal (ecs->event_thread->stop_bpstat) | |
3893 | && stopped_by_watchpoint) | |
3894 | fprintf_unfiltered (gdb_stdlog, "\ | |
3895 | infrun: no user watchpoint explains watchpoint SIGTRAP, ignoring\n"); | |
3896 | ||
73dd234f | 3897 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
3898 | at one stage in the past included checks for an inferior |
3899 | function call's call dummy's return breakpoint. The original | |
3900 | comment, that went with the test, read: | |
73dd234f | 3901 | |
8fb3e588 AC |
3902 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
3903 | another signal besides SIGTRAP, so check here as well as | |
3904 | above.'' | |
73dd234f | 3905 | |
8002d778 | 3906 | If someone ever tries to get call dummys on a |
73dd234f | 3907 | non-executable stack to work (where the target would stop |
03cebad2 MK |
3908 | with something like a SIGSEGV), then those tests might need |
3909 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 3910 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
3911 | suspect that it won't be the case. |
3912 | ||
8fb3e588 AC |
3913 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
3914 | be necessary for call dummies on a non-executable stack on | |
3915 | SPARC. */ | |
73dd234f | 3916 | |
2020b7ab | 3917 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP) |
488f131b | 3918 | ecs->random_signal |
347bddb7 | 3919 | = !(bpstat_explains_signal (ecs->event_thread->stop_bpstat) |
db82e815 | 3920 | || stopped_by_watchpoint |
4e1c45ea PA |
3921 | || ecs->event_thread->trap_expected |
3922 | || (ecs->event_thread->step_range_end | |
3923 | && ecs->event_thread->step_resume_breakpoint == NULL)); | |
488f131b JB |
3924 | else |
3925 | { | |
347bddb7 | 3926 | ecs->random_signal = !bpstat_explains_signal (ecs->event_thread->stop_bpstat); |
488f131b | 3927 | if (!ecs->random_signal) |
2020b7ab | 3928 | ecs->event_thread->stop_signal = TARGET_SIGNAL_TRAP; |
488f131b JB |
3929 | } |
3930 | } | |
3931 | ||
3932 | /* When we reach this point, we've pretty much decided | |
3933 | that the reason for stopping must've been a random | |
3934 | (unexpected) signal. */ | |
3935 | ||
3936 | else | |
3937 | ecs->random_signal = 1; | |
488f131b | 3938 | |
04e68871 | 3939 | process_event_stop_test: |
568d6575 UW |
3940 | |
3941 | /* Re-fetch current thread's frame in case we did a | |
3942 | "goto process_event_stop_test" above. */ | |
3943 | frame = get_current_frame (); | |
3944 | gdbarch = get_frame_arch (frame); | |
3945 | ||
488f131b JB |
3946 | /* For the program's own signals, act according to |
3947 | the signal handling tables. */ | |
3948 | ||
3949 | if (ecs->random_signal) | |
3950 | { | |
3951 | /* Signal not for debugging purposes. */ | |
3952 | int printed = 0; | |
24291992 | 3953 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); |
488f131b | 3954 | |
527159b7 | 3955 | if (debug_infrun) |
2020b7ab PA |
3956 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", |
3957 | ecs->event_thread->stop_signal); | |
527159b7 | 3958 | |
488f131b JB |
3959 | stopped_by_random_signal = 1; |
3960 | ||
2020b7ab | 3961 | if (signal_print[ecs->event_thread->stop_signal]) |
488f131b JB |
3962 | { |
3963 | printed = 1; | |
3964 | target_terminal_ours_for_output (); | |
2020b7ab | 3965 | print_stop_reason (SIGNAL_RECEIVED, ecs->event_thread->stop_signal); |
488f131b | 3966 | } |
252fbfc8 PA |
3967 | /* Always stop on signals if we're either just gaining control |
3968 | of the program, or the user explicitly requested this thread | |
3969 | to remain stopped. */ | |
d6b48e9c | 3970 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 3971 | || ecs->event_thread->stop_requested |
24291992 PA |
3972 | || (!inf->detaching |
3973 | && signal_stop_state (ecs->event_thread->stop_signal))) | |
488f131b JB |
3974 | { |
3975 | stop_stepping (ecs); | |
3976 | return; | |
3977 | } | |
3978 | /* If not going to stop, give terminal back | |
3979 | if we took it away. */ | |
3980 | else if (printed) | |
3981 | target_terminal_inferior (); | |
3982 | ||
3983 | /* Clear the signal if it should not be passed. */ | |
2020b7ab PA |
3984 | if (signal_program[ecs->event_thread->stop_signal] == 0) |
3985 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; | |
488f131b | 3986 | |
fb14de7b | 3987 | if (ecs->event_thread->prev_pc == stop_pc |
4e1c45ea PA |
3988 | && ecs->event_thread->trap_expected |
3989 | && ecs->event_thread->step_resume_breakpoint == NULL) | |
68f53502 AC |
3990 | { |
3991 | /* We were just starting a new sequence, attempting to | |
3992 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 3993 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
3994 | of the stepping range so GDB needs to remember to, when |
3995 | the signal handler returns, resume stepping off that | |
3996 | breakpoint. */ | |
3997 | /* To simplify things, "continue" is forced to use the same | |
3998 | code paths as single-step - set a breakpoint at the | |
3999 | signal return address and then, once hit, step off that | |
4000 | breakpoint. */ | |
237fc4c9 PA |
4001 | if (debug_infrun) |
4002 | fprintf_unfiltered (gdb_stdlog, | |
4003 | "infrun: signal arrived while stepping over " | |
4004 | "breakpoint\n"); | |
d3169d93 | 4005 | |
568d6575 | 4006 | insert_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 4007 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
9d799f85 AC |
4008 | keep_going (ecs); |
4009 | return; | |
68f53502 | 4010 | } |
9d799f85 | 4011 | |
4e1c45ea | 4012 | if (ecs->event_thread->step_range_end != 0 |
2020b7ab | 4013 | && ecs->event_thread->stop_signal != TARGET_SIGNAL_0 |
4e1c45ea PA |
4014 | && (ecs->event_thread->step_range_start <= stop_pc |
4015 | && stop_pc < ecs->event_thread->step_range_end) | |
edb3359d DJ |
4016 | && frame_id_eq (get_stack_frame_id (frame), |
4017 | ecs->event_thread->step_stack_frame_id) | |
4e1c45ea | 4018 | && ecs->event_thread->step_resume_breakpoint == NULL) |
d303a6c7 AC |
4019 | { |
4020 | /* The inferior is about to take a signal that will take it | |
4021 | out of the single step range. Set a breakpoint at the | |
4022 | current PC (which is presumably where the signal handler | |
4023 | will eventually return) and then allow the inferior to | |
4024 | run free. | |
4025 | ||
4026 | Note that this is only needed for a signal delivered | |
4027 | while in the single-step range. Nested signals aren't a | |
4028 | problem as they eventually all return. */ | |
237fc4c9 PA |
4029 | if (debug_infrun) |
4030 | fprintf_unfiltered (gdb_stdlog, | |
4031 | "infrun: signal may take us out of " | |
4032 | "single-step range\n"); | |
4033 | ||
568d6575 | 4034 | insert_step_resume_breakpoint_at_frame (frame); |
9d799f85 AC |
4035 | keep_going (ecs); |
4036 | return; | |
d303a6c7 | 4037 | } |
9d799f85 AC |
4038 | |
4039 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
4040 | when either there's a nested signal, or when there's a | |
4041 | pending signal enabled just as the signal handler returns | |
4042 | (leaving the inferior at the step-resume-breakpoint without | |
4043 | actually executing it). Either way continue until the | |
4044 | breakpoint is really hit. */ | |
488f131b JB |
4045 | keep_going (ecs); |
4046 | return; | |
4047 | } | |
4048 | ||
4049 | /* Handle cases caused by hitting a breakpoint. */ | |
4050 | { | |
4051 | CORE_ADDR jmp_buf_pc; | |
4052 | struct bpstat_what what; | |
4053 | ||
347bddb7 | 4054 | what = bpstat_what (ecs->event_thread->stop_bpstat); |
488f131b JB |
4055 | |
4056 | if (what.call_dummy) | |
4057 | { | |
aa7d318d | 4058 | stop_stack_dummy = what.call_dummy; |
c5aa993b | 4059 | } |
c906108c | 4060 | |
628fe4e4 JK |
4061 | /* If we hit an internal event that triggers symbol changes, the |
4062 | current frame will be invalidated within bpstat_what (e.g., if | |
4063 | we hit an internal solib event). Re-fetch it. */ | |
4064 | frame = get_current_frame (); | |
4065 | gdbarch = get_frame_arch (frame); | |
4066 | ||
488f131b | 4067 | switch (what.main_action) |
c5aa993b | 4068 | { |
488f131b | 4069 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
611c83ae PA |
4070 | /* If we hit the breakpoint at longjmp while stepping, we |
4071 | install a momentary breakpoint at the target of the | |
4072 | jmp_buf. */ | |
4073 | ||
4074 | if (debug_infrun) | |
4075 | fprintf_unfiltered (gdb_stdlog, | |
4076 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
4077 | ||
4e1c45ea | 4078 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 4079 | |
568d6575 UW |
4080 | if (!gdbarch_get_longjmp_target_p (gdbarch) |
4081 | || !gdbarch_get_longjmp_target (gdbarch, frame, &jmp_buf_pc)) | |
c5aa993b | 4082 | { |
611c83ae PA |
4083 | if (debug_infrun) |
4084 | fprintf_unfiltered (gdb_stdlog, "\ | |
4085 | infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n"); | |
488f131b | 4086 | keep_going (ecs); |
104c1213 | 4087 | return; |
c5aa993b | 4088 | } |
488f131b | 4089 | |
611c83ae PA |
4090 | /* We're going to replace the current step-resume breakpoint |
4091 | with a longjmp-resume breakpoint. */ | |
4e1c45ea | 4092 | delete_step_resume_breakpoint (ecs->event_thread); |
611c83ae PA |
4093 | |
4094 | /* Insert a breakpoint at resume address. */ | |
a6d9a66e | 4095 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); |
c906108c | 4096 | |
488f131b JB |
4097 | keep_going (ecs); |
4098 | return; | |
c906108c | 4099 | |
488f131b | 4100 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
527159b7 | 4101 | if (debug_infrun) |
611c83ae PA |
4102 | fprintf_unfiltered (gdb_stdlog, |
4103 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
4104 | ||
4e1c45ea PA |
4105 | gdb_assert (ecs->event_thread->step_resume_breakpoint != NULL); |
4106 | delete_step_resume_breakpoint (ecs->event_thread); | |
611c83ae | 4107 | |
414c69f7 | 4108 | ecs->event_thread->stop_step = 1; |
611c83ae PA |
4109 | print_stop_reason (END_STEPPING_RANGE, 0); |
4110 | stop_stepping (ecs); | |
4111 | return; | |
488f131b JB |
4112 | |
4113 | case BPSTAT_WHAT_SINGLE: | |
527159b7 | 4114 | if (debug_infrun) |
8802d8ed | 4115 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); |
4e1c45ea | 4116 | ecs->event_thread->stepping_over_breakpoint = 1; |
488f131b JB |
4117 | /* Still need to check other stuff, at least the case |
4118 | where we are stepping and step out of the right range. */ | |
4119 | break; | |
c906108c | 4120 | |
488f131b | 4121 | case BPSTAT_WHAT_STOP_NOISY: |
527159b7 | 4122 | if (debug_infrun) |
8802d8ed | 4123 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); |
488f131b | 4124 | stop_print_frame = 1; |
c906108c | 4125 | |
d303a6c7 AC |
4126 | /* We are about to nuke the step_resume_breakpointt via the |
4127 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 4128 | |
488f131b JB |
4129 | stop_stepping (ecs); |
4130 | return; | |
c5aa993b | 4131 | |
488f131b | 4132 | case BPSTAT_WHAT_STOP_SILENT: |
527159b7 | 4133 | if (debug_infrun) |
8802d8ed | 4134 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); |
488f131b | 4135 | stop_print_frame = 0; |
c5aa993b | 4136 | |
d303a6c7 AC |
4137 | /* We are about to nuke the step_resume_breakpoin via the |
4138 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 4139 | |
488f131b | 4140 | stop_stepping (ecs); |
e441088d | 4141 | return; |
c5aa993b | 4142 | |
488f131b | 4143 | case BPSTAT_WHAT_STEP_RESUME: |
527159b7 | 4144 | if (debug_infrun) |
8802d8ed | 4145 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); |
527159b7 | 4146 | |
4e1c45ea PA |
4147 | delete_step_resume_breakpoint (ecs->event_thread); |
4148 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
68f53502 AC |
4149 | { |
4150 | /* Back when the step-resume breakpoint was inserted, we | |
4151 | were trying to single-step off a breakpoint. Go back | |
4152 | to doing that. */ | |
4e1c45ea PA |
4153 | ecs->event_thread->step_after_step_resume_breakpoint = 0; |
4154 | ecs->event_thread->stepping_over_breakpoint = 1; | |
68f53502 AC |
4155 | keep_going (ecs); |
4156 | return; | |
4157 | } | |
b2175913 MS |
4158 | if (stop_pc == ecs->stop_func_start |
4159 | && execution_direction == EXEC_REVERSE) | |
4160 | { | |
4161 | /* We are stepping over a function call in reverse, and | |
4162 | just hit the step-resume breakpoint at the start | |
4163 | address of the function. Go back to single-stepping, | |
4164 | which should take us back to the function call. */ | |
4165 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4166 | keep_going (ecs); | |
4167 | return; | |
4168 | } | |
488f131b JB |
4169 | break; |
4170 | ||
488f131b JB |
4171 | case BPSTAT_WHAT_KEEP_CHECKING: |
4172 | break; | |
4173 | } | |
4174 | } | |
c906108c | 4175 | |
488f131b JB |
4176 | /* We come here if we hit a breakpoint but should not |
4177 | stop for it. Possibly we also were stepping | |
4178 | and should stop for that. So fall through and | |
4179 | test for stepping. But, if not stepping, | |
4180 | do not stop. */ | |
c906108c | 4181 | |
a7212384 UW |
4182 | /* In all-stop mode, if we're currently stepping but have stopped in |
4183 | some other thread, we need to switch back to the stepped thread. */ | |
4184 | if (!non_stop) | |
4185 | { | |
4186 | struct thread_info *tp; | |
abbb1732 | 4187 | |
b3444185 | 4188 | tp = iterate_over_threads (currently_stepping_or_nexting_callback, |
a7212384 UW |
4189 | ecs->event_thread); |
4190 | if (tp) | |
4191 | { | |
4192 | /* However, if the current thread is blocked on some internal | |
4193 | breakpoint, and we simply need to step over that breakpoint | |
4194 | to get it going again, do that first. */ | |
4195 | if ((ecs->event_thread->trap_expected | |
4196 | && ecs->event_thread->stop_signal != TARGET_SIGNAL_TRAP) | |
4197 | || ecs->event_thread->stepping_over_breakpoint) | |
4198 | { | |
4199 | keep_going (ecs); | |
4200 | return; | |
4201 | } | |
4202 | ||
66852e9c PA |
4203 | /* If the stepping thread exited, then don't try to switch |
4204 | back and resume it, which could fail in several different | |
4205 | ways depending on the target. Instead, just keep going. | |
4206 | ||
4207 | We can find a stepping dead thread in the thread list in | |
4208 | two cases: | |
4209 | ||
4210 | - The target supports thread exit events, and when the | |
4211 | target tries to delete the thread from the thread list, | |
4212 | inferior_ptid pointed at the exiting thread. In such | |
4213 | case, calling delete_thread does not really remove the | |
4214 | thread from the list; instead, the thread is left listed, | |
4215 | with 'exited' state. | |
4216 | ||
4217 | - The target's debug interface does not support thread | |
4218 | exit events, and so we have no idea whatsoever if the | |
4219 | previously stepping thread is still alive. For that | |
4220 | reason, we need to synchronously query the target | |
4221 | now. */ | |
b3444185 PA |
4222 | if (is_exited (tp->ptid) |
4223 | || !target_thread_alive (tp->ptid)) | |
4224 | { | |
4225 | if (debug_infrun) | |
4226 | fprintf_unfiltered (gdb_stdlog, "\ | |
4227 | infrun: not switching back to stepped thread, it has vanished\n"); | |
4228 | ||
4229 | delete_thread (tp->ptid); | |
4230 | keep_going (ecs); | |
4231 | return; | |
4232 | } | |
4233 | ||
a7212384 UW |
4234 | /* Otherwise, we no longer expect a trap in the current thread. |
4235 | Clear the trap_expected flag before switching back -- this is | |
4236 | what keep_going would do as well, if we called it. */ | |
4237 | ecs->event_thread->trap_expected = 0; | |
4238 | ||
4239 | if (debug_infrun) | |
4240 | fprintf_unfiltered (gdb_stdlog, | |
4241 | "infrun: switching back to stepped thread\n"); | |
4242 | ||
4243 | ecs->event_thread = tp; | |
4244 | ecs->ptid = tp->ptid; | |
4245 | context_switch (ecs->ptid); | |
4246 | keep_going (ecs); | |
4247 | return; | |
4248 | } | |
4249 | } | |
4250 | ||
9d1ff73f MS |
4251 | /* Are we stepping to get the inferior out of the dynamic linker's |
4252 | hook (and possibly the dld itself) after catching a shlib | |
4253 | event? */ | |
4e1c45ea | 4254 | if (ecs->event_thread->stepping_through_solib_after_catch) |
488f131b JB |
4255 | { |
4256 | #if defined(SOLIB_ADD) | |
4257 | /* Have we reached our destination? If not, keep going. */ | |
4258 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
4259 | { | |
527159b7 | 4260 | if (debug_infrun) |
8a9de0e4 | 4261 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n"); |
4e1c45ea | 4262 | ecs->event_thread->stepping_over_breakpoint = 1; |
488f131b | 4263 | keep_going (ecs); |
104c1213 | 4264 | return; |
488f131b JB |
4265 | } |
4266 | #endif | |
527159b7 | 4267 | if (debug_infrun) |
8a9de0e4 | 4268 | fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n"); |
488f131b JB |
4269 | /* Else, stop and report the catchpoint(s) whose triggering |
4270 | caused us to begin stepping. */ | |
4e1c45ea | 4271 | ecs->event_thread->stepping_through_solib_after_catch = 0; |
347bddb7 PA |
4272 | bpstat_clear (&ecs->event_thread->stop_bpstat); |
4273 | ecs->event_thread->stop_bpstat | |
4274 | = bpstat_copy (ecs->event_thread->stepping_through_solib_catchpoints); | |
4e1c45ea | 4275 | bpstat_clear (&ecs->event_thread->stepping_through_solib_catchpoints); |
488f131b JB |
4276 | stop_print_frame = 1; |
4277 | stop_stepping (ecs); | |
4278 | return; | |
4279 | } | |
c906108c | 4280 | |
4e1c45ea | 4281 | if (ecs->event_thread->step_resume_breakpoint) |
488f131b | 4282 | { |
527159b7 | 4283 | if (debug_infrun) |
d3169d93 DJ |
4284 | fprintf_unfiltered (gdb_stdlog, |
4285 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 4286 | |
488f131b JB |
4287 | /* Having a step-resume breakpoint overrides anything |
4288 | else having to do with stepping commands until | |
4289 | that breakpoint is reached. */ | |
488f131b JB |
4290 | keep_going (ecs); |
4291 | return; | |
4292 | } | |
c5aa993b | 4293 | |
4e1c45ea | 4294 | if (ecs->event_thread->step_range_end == 0) |
488f131b | 4295 | { |
527159b7 | 4296 | if (debug_infrun) |
8a9de0e4 | 4297 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 4298 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
4299 | keep_going (ecs); |
4300 | return; | |
4301 | } | |
c5aa993b | 4302 | |
4b7703ad JB |
4303 | /* Re-fetch current thread's frame in case the code above caused |
4304 | the frame cache to be re-initialized, making our FRAME variable | |
4305 | a dangling pointer. */ | |
4306 | frame = get_current_frame (); | |
628fe4e4 | 4307 | gdbarch = get_frame_arch (frame); |
4b7703ad | 4308 | |
488f131b | 4309 | /* If stepping through a line, keep going if still within it. |
c906108c | 4310 | |
488f131b JB |
4311 | Note that step_range_end is the address of the first instruction |
4312 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
4313 | within it! |
4314 | ||
4315 | Note also that during reverse execution, we may be stepping | |
4316 | through a function epilogue and therefore must detect when | |
4317 | the current-frame changes in the middle of a line. */ | |
4318 | ||
4e1c45ea | 4319 | if (stop_pc >= ecs->event_thread->step_range_start |
31410e84 MS |
4320 | && stop_pc < ecs->event_thread->step_range_end |
4321 | && (execution_direction != EXEC_REVERSE | |
388a8562 | 4322 | || frame_id_eq (get_frame_id (frame), |
31410e84 | 4323 | ecs->event_thread->step_frame_id))) |
488f131b | 4324 | { |
527159b7 | 4325 | if (debug_infrun) |
5af949e3 UW |
4326 | fprintf_unfiltered |
4327 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
4328 | paddress (gdbarch, ecs->event_thread->step_range_start), | |
4329 | paddress (gdbarch, ecs->event_thread->step_range_end)); | |
b2175913 MS |
4330 | |
4331 | /* When stepping backward, stop at beginning of line range | |
4332 | (unless it's the function entry point, in which case | |
4333 | keep going back to the call point). */ | |
4334 | if (stop_pc == ecs->event_thread->step_range_start | |
4335 | && stop_pc != ecs->stop_func_start | |
4336 | && execution_direction == EXEC_REVERSE) | |
4337 | { | |
4338 | ecs->event_thread->stop_step = 1; | |
4339 | print_stop_reason (END_STEPPING_RANGE, 0); | |
4340 | stop_stepping (ecs); | |
4341 | } | |
4342 | else | |
4343 | keep_going (ecs); | |
4344 | ||
488f131b JB |
4345 | return; |
4346 | } | |
c5aa993b | 4347 | |
488f131b | 4348 | /* We stepped out of the stepping range. */ |
c906108c | 4349 | |
488f131b | 4350 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
4351 | loader dynamic symbol resolution code... |
4352 | ||
4353 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
4354 | time loader code and reach the callee's address. | |
4355 | ||
4356 | EXEC_REVERSE: we've already executed the callee (backward), and | |
4357 | the runtime loader code is handled just like any other | |
4358 | undebuggable function call. Now we need only keep stepping | |
4359 | backward through the trampoline code, and that's handled further | |
4360 | down, so there is nothing for us to do here. */ | |
4361 | ||
4362 | if (execution_direction != EXEC_REVERSE | |
4363 | && ecs->event_thread->step_over_calls == STEP_OVER_UNDEBUGGABLE | |
cfd8ab24 | 4364 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 4365 | { |
4c8c40e6 | 4366 | CORE_ADDR pc_after_resolver = |
568d6575 | 4367 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); |
c906108c | 4368 | |
527159b7 | 4369 | if (debug_infrun) |
8a9de0e4 | 4370 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n"); |
527159b7 | 4371 | |
488f131b JB |
4372 | if (pc_after_resolver) |
4373 | { | |
4374 | /* Set up a step-resume breakpoint at the address | |
4375 | indicated by SKIP_SOLIB_RESOLVER. */ | |
4376 | struct symtab_and_line sr_sal; | |
abbb1732 | 4377 | |
fe39c653 | 4378 | init_sal (&sr_sal); |
488f131b | 4379 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 4380 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 4381 | |
a6d9a66e UW |
4382 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4383 | sr_sal, null_frame_id); | |
c5aa993b | 4384 | } |
c906108c | 4385 | |
488f131b JB |
4386 | keep_going (ecs); |
4387 | return; | |
4388 | } | |
c906108c | 4389 | |
4e1c45ea | 4390 | if (ecs->event_thread->step_range_end != 1 |
078130d0 PA |
4391 | && (ecs->event_thread->step_over_calls == STEP_OVER_UNDEBUGGABLE |
4392 | || ecs->event_thread->step_over_calls == STEP_OVER_ALL) | |
568d6575 | 4393 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 4394 | { |
527159b7 | 4395 | if (debug_infrun) |
8a9de0e4 | 4396 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n"); |
42edda50 | 4397 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
4398 | a signal trampoline (either by a signal being delivered or by |
4399 | the signal handler returning). Just single-step until the | |
4400 | inferior leaves the trampoline (either by calling the handler | |
4401 | or returning). */ | |
488f131b JB |
4402 | keep_going (ecs); |
4403 | return; | |
4404 | } | |
c906108c | 4405 | |
c17eaafe DJ |
4406 | /* Check for subroutine calls. The check for the current frame |
4407 | equalling the step ID is not necessary - the check of the | |
4408 | previous frame's ID is sufficient - but it is a common case and | |
4409 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
4410 | |
4411 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
4412 | being equal, so to get into this block, both the current and | |
4413 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
4414 | /* The outer_frame_id check is a heuristic to detect stepping |
4415 | through startup code. If we step over an instruction which | |
4416 | sets the stack pointer from an invalid value to a valid value, | |
4417 | we may detect that as a subroutine call from the mythical | |
4418 | "outermost" function. This could be fixed by marking | |
4419 | outermost frames as !stack_p,code_p,special_p. Then the | |
4420 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 4421 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 4422 | for more. */ |
edb3359d DJ |
4423 | if (!frame_id_eq (get_stack_frame_id (frame), |
4424 | ecs->event_thread->step_stack_frame_id) | |
005ca36a JB |
4425 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
4426 | ecs->event_thread->step_stack_frame_id) | |
4427 | && (!frame_id_eq (ecs->event_thread->step_stack_frame_id, | |
4428 | outer_frame_id) | |
4429 | || step_start_function != find_pc_function (stop_pc)))) | |
488f131b | 4430 | { |
95918acb | 4431 | CORE_ADDR real_stop_pc; |
8fb3e588 | 4432 | |
527159b7 | 4433 | if (debug_infrun) |
8a9de0e4 | 4434 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 4435 | |
078130d0 | 4436 | if ((ecs->event_thread->step_over_calls == STEP_OVER_NONE) |
4e1c45ea | 4437 | || ((ecs->event_thread->step_range_end == 1) |
d80b854b | 4438 | && in_prologue (gdbarch, ecs->event_thread->prev_pc, |
4e1c45ea | 4439 | ecs->stop_func_start))) |
95918acb AC |
4440 | { |
4441 | /* I presume that step_over_calls is only 0 when we're | |
4442 | supposed to be stepping at the assembly language level | |
4443 | ("stepi"). Just stop. */ | |
4444 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
4445 | thought it was a subroutine call but it was not. Stop as | |
4446 | well. FENN */ | |
388a8562 | 4447 | /* And this works the same backward as frontward. MVS */ |
414c69f7 | 4448 | ecs->event_thread->stop_step = 1; |
95918acb AC |
4449 | print_stop_reason (END_STEPPING_RANGE, 0); |
4450 | stop_stepping (ecs); | |
4451 | return; | |
4452 | } | |
8fb3e588 | 4453 | |
388a8562 MS |
4454 | /* Reverse stepping through solib trampolines. */ |
4455 | ||
4456 | if (execution_direction == EXEC_REVERSE | |
fdd654f3 | 4457 | && ecs->event_thread->step_over_calls != STEP_OVER_NONE |
388a8562 MS |
4458 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
4459 | || (ecs->stop_func_start == 0 | |
4460 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
4461 | { | |
4462 | /* Any solib trampoline code can be handled in reverse | |
4463 | by simply continuing to single-step. We have already | |
4464 | executed the solib function (backwards), and a few | |
4465 | steps will take us back through the trampoline to the | |
4466 | caller. */ | |
4467 | keep_going (ecs); | |
4468 | return; | |
4469 | } | |
4470 | ||
078130d0 | 4471 | if (ecs->event_thread->step_over_calls == STEP_OVER_ALL) |
8567c30f | 4472 | { |
b2175913 MS |
4473 | /* We're doing a "next". |
4474 | ||
4475 | Normal (forward) execution: set a breakpoint at the | |
4476 | callee's return address (the address at which the caller | |
4477 | will resume). | |
4478 | ||
4479 | Reverse (backward) execution. set the step-resume | |
4480 | breakpoint at the start of the function that we just | |
4481 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 4482 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
4483 | |
4484 | if (execution_direction == EXEC_REVERSE) | |
4485 | { | |
4486 | struct symtab_and_line sr_sal; | |
3067f6e5 | 4487 | |
388a8562 MS |
4488 | /* Normal function call return (static or dynamic). */ |
4489 | init_sal (&sr_sal); | |
4490 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df PA |
4491 | sr_sal.pspace = get_frame_program_space (frame); |
4492 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
4493 | sr_sal, null_frame_id); | |
b2175913 MS |
4494 | } |
4495 | else | |
568d6575 | 4496 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 4497 | |
8567c30f AC |
4498 | keep_going (ecs); |
4499 | return; | |
4500 | } | |
a53c66de | 4501 | |
95918acb | 4502 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
4503 | calling routine and the real function), locate the real |
4504 | function. That's what tells us (a) whether we want to step | |
4505 | into it at all, and (b) what prologue we want to run to the | |
4506 | end of, if we do step into it. */ | |
568d6575 | 4507 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 4508 | if (real_stop_pc == 0) |
568d6575 | 4509 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
4510 | if (real_stop_pc != 0) |
4511 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 4512 | |
db5f024e | 4513 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 RC |
4514 | { |
4515 | struct symtab_and_line sr_sal; | |
abbb1732 | 4516 | |
1b2bfbb9 RC |
4517 | init_sal (&sr_sal); |
4518 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 4519 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 4520 | |
a6d9a66e UW |
4521 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4522 | sr_sal, null_frame_id); | |
8fb3e588 AC |
4523 | keep_going (ecs); |
4524 | return; | |
1b2bfbb9 RC |
4525 | } |
4526 | ||
95918acb | 4527 | /* If we have line number information for the function we are |
8fb3e588 | 4528 | thinking of stepping into, step into it. |
95918acb | 4529 | |
8fb3e588 AC |
4530 | If there are several symtabs at that PC (e.g. with include |
4531 | files), just want to know whether *any* of them have line | |
4532 | numbers. find_pc_line handles this. */ | |
95918acb AC |
4533 | { |
4534 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 4535 | |
95918acb | 4536 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
9d1807c3 | 4537 | tmp_sal.pspace = get_frame_program_space (frame); |
95918acb AC |
4538 | if (tmp_sal.line != 0) |
4539 | { | |
b2175913 | 4540 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 4541 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 4542 | else |
568d6575 | 4543 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
4544 | return; |
4545 | } | |
4546 | } | |
4547 | ||
4548 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
4549 | set, we stop the step so that the user has a chance to switch |
4550 | in assembly mode. */ | |
078130d0 PA |
4551 | if (ecs->event_thread->step_over_calls == STEP_OVER_UNDEBUGGABLE |
4552 | && step_stop_if_no_debug) | |
95918acb | 4553 | { |
414c69f7 | 4554 | ecs->event_thread->stop_step = 1; |
95918acb AC |
4555 | print_stop_reason (END_STEPPING_RANGE, 0); |
4556 | stop_stepping (ecs); | |
4557 | return; | |
4558 | } | |
4559 | ||
b2175913 MS |
4560 | if (execution_direction == EXEC_REVERSE) |
4561 | { | |
4562 | /* Set a breakpoint at callee's start address. | |
4563 | From there we can step once and be back in the caller. */ | |
4564 | struct symtab_and_line sr_sal; | |
abbb1732 | 4565 | |
b2175913 MS |
4566 | init_sal (&sr_sal); |
4567 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 4568 | sr_sal.pspace = get_frame_program_space (frame); |
a6d9a66e UW |
4569 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4570 | sr_sal, null_frame_id); | |
b2175913 MS |
4571 | } |
4572 | else | |
4573 | /* Set a breakpoint at callee's return address (the address | |
4574 | at which the caller will resume). */ | |
568d6575 | 4575 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 4576 | |
95918acb | 4577 | keep_going (ecs); |
488f131b | 4578 | return; |
488f131b | 4579 | } |
c906108c | 4580 | |
fdd654f3 MS |
4581 | /* Reverse stepping through solib trampolines. */ |
4582 | ||
4583 | if (execution_direction == EXEC_REVERSE | |
4584 | && ecs->event_thread->step_over_calls != STEP_OVER_NONE) | |
4585 | { | |
4586 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
4587 | || (ecs->stop_func_start == 0 | |
4588 | && in_solib_dynsym_resolve_code (stop_pc))) | |
4589 | { | |
4590 | /* Any solib trampoline code can be handled in reverse | |
4591 | by simply continuing to single-step. We have already | |
4592 | executed the solib function (backwards), and a few | |
4593 | steps will take us back through the trampoline to the | |
4594 | caller. */ | |
4595 | keep_going (ecs); | |
4596 | return; | |
4597 | } | |
4598 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
4599 | { | |
4600 | /* Stepped backward into the solib dynsym resolver. | |
4601 | Set a breakpoint at its start and continue, then | |
4602 | one more step will take us out. */ | |
4603 | struct symtab_and_line sr_sal; | |
abbb1732 | 4604 | |
fdd654f3 MS |
4605 | init_sal (&sr_sal); |
4606 | sr_sal.pc = ecs->stop_func_start; | |
9d1807c3 | 4607 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
4608 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4609 | sr_sal, null_frame_id); | |
4610 | keep_going (ecs); | |
4611 | return; | |
4612 | } | |
4613 | } | |
4614 | ||
488f131b JB |
4615 | /* If we're in the return path from a shared library trampoline, |
4616 | we want to proceed through the trampoline when stepping. */ | |
568d6575 | 4617 | if (gdbarch_in_solib_return_trampoline (gdbarch, |
e76f05fa | 4618 | stop_pc, ecs->stop_func_name)) |
488f131b | 4619 | { |
488f131b | 4620 | /* Determine where this trampoline returns. */ |
52f729a7 | 4621 | CORE_ADDR real_stop_pc; |
abbb1732 | 4622 | |
568d6575 | 4623 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
c906108c | 4624 | |
527159b7 | 4625 | if (debug_infrun) |
8a9de0e4 | 4626 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n"); |
527159b7 | 4627 | |
488f131b | 4628 | /* Only proceed through if we know where it's going. */ |
d764a824 | 4629 | if (real_stop_pc) |
488f131b JB |
4630 | { |
4631 | /* And put the step-breakpoint there and go until there. */ | |
4632 | struct symtab_and_line sr_sal; | |
4633 | ||
fe39c653 | 4634 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 4635 | sr_sal.pc = real_stop_pc; |
488f131b | 4636 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 4637 | sr_sal.pspace = get_frame_program_space (frame); |
44cbf7b5 AC |
4638 | |
4639 | /* Do not specify what the fp should be when we stop since | |
4640 | on some machines the prologue is where the new fp value | |
4641 | is established. */ | |
a6d9a66e UW |
4642 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4643 | sr_sal, null_frame_id); | |
c906108c | 4644 | |
488f131b JB |
4645 | /* Restart without fiddling with the step ranges or |
4646 | other state. */ | |
4647 | keep_going (ecs); | |
4648 | return; | |
4649 | } | |
4650 | } | |
c906108c | 4651 | |
2afb61aa | 4652 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 4653 | |
1b2bfbb9 RC |
4654 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
4655 | the trampoline processing logic, however, there are some trampolines | |
4656 | that have no names, so we should do trampoline handling first. */ | |
078130d0 | 4657 | if (ecs->event_thread->step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 4658 | && ecs->stop_func_name == NULL |
2afb61aa | 4659 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 4660 | { |
527159b7 | 4661 | if (debug_infrun) |
8a9de0e4 | 4662 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n"); |
527159b7 | 4663 | |
1b2bfbb9 | 4664 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
4665 | undebuggable function (where there is no debugging information |
4666 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
4667 | inferior stopped). Since we want to skip this kind of code, |
4668 | we keep going until the inferior returns from this | |
14e60db5 DJ |
4669 | function - unless the user has asked us not to (via |
4670 | set step-mode) or we no longer know how to get back | |
4671 | to the call site. */ | |
4672 | if (step_stop_if_no_debug | |
c7ce8faa | 4673 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
4674 | { |
4675 | /* If we have no line number and the step-stop-if-no-debug | |
4676 | is set, we stop the step so that the user has a chance to | |
4677 | switch in assembly mode. */ | |
414c69f7 | 4678 | ecs->event_thread->stop_step = 1; |
1b2bfbb9 RC |
4679 | print_stop_reason (END_STEPPING_RANGE, 0); |
4680 | stop_stepping (ecs); | |
4681 | return; | |
4682 | } | |
4683 | else | |
4684 | { | |
4685 | /* Set a breakpoint at callee's return address (the address | |
4686 | at which the caller will resume). */ | |
568d6575 | 4687 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
4688 | keep_going (ecs); |
4689 | return; | |
4690 | } | |
4691 | } | |
4692 | ||
4e1c45ea | 4693 | if (ecs->event_thread->step_range_end == 1) |
1b2bfbb9 RC |
4694 | { |
4695 | /* It is stepi or nexti. We always want to stop stepping after | |
4696 | one instruction. */ | |
527159b7 | 4697 | if (debug_infrun) |
8a9de0e4 | 4698 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
414c69f7 | 4699 | ecs->event_thread->stop_step = 1; |
1b2bfbb9 RC |
4700 | print_stop_reason (END_STEPPING_RANGE, 0); |
4701 | stop_stepping (ecs); | |
4702 | return; | |
4703 | } | |
4704 | ||
2afb61aa | 4705 | if (stop_pc_sal.line == 0) |
488f131b JB |
4706 | { |
4707 | /* We have no line number information. That means to stop | |
4708 | stepping (does this always happen right after one instruction, | |
4709 | when we do "s" in a function with no line numbers, | |
4710 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 4711 | if (debug_infrun) |
8a9de0e4 | 4712 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
414c69f7 | 4713 | ecs->event_thread->stop_step = 1; |
488f131b JB |
4714 | print_stop_reason (END_STEPPING_RANGE, 0); |
4715 | stop_stepping (ecs); | |
4716 | return; | |
4717 | } | |
c906108c | 4718 | |
edb3359d DJ |
4719 | /* Look for "calls" to inlined functions, part one. If the inline |
4720 | frame machinery detected some skipped call sites, we have entered | |
4721 | a new inline function. */ | |
4722 | ||
4723 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
4724 | ecs->event_thread->step_frame_id) | |
4725 | && inline_skipped_frames (ecs->ptid)) | |
4726 | { | |
4727 | struct symtab_and_line call_sal; | |
4728 | ||
4729 | if (debug_infrun) | |
4730 | fprintf_unfiltered (gdb_stdlog, | |
4731 | "infrun: stepped into inlined function\n"); | |
4732 | ||
4733 | find_frame_sal (get_current_frame (), &call_sal); | |
4734 | ||
4735 | if (ecs->event_thread->step_over_calls != STEP_OVER_ALL) | |
4736 | { | |
4737 | /* For "step", we're going to stop. But if the call site | |
4738 | for this inlined function is on the same source line as | |
4739 | we were previously stepping, go down into the function | |
4740 | first. Otherwise stop at the call site. */ | |
4741 | ||
4742 | if (call_sal.line == ecs->event_thread->current_line | |
4743 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4744 | step_into_inline_frame (ecs->ptid); | |
4745 | ||
4746 | ecs->event_thread->stop_step = 1; | |
4747 | print_stop_reason (END_STEPPING_RANGE, 0); | |
4748 | stop_stepping (ecs); | |
4749 | return; | |
4750 | } | |
4751 | else | |
4752 | { | |
4753 | /* For "next", we should stop at the call site if it is on a | |
4754 | different source line. Otherwise continue through the | |
4755 | inlined function. */ | |
4756 | if (call_sal.line == ecs->event_thread->current_line | |
4757 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4758 | keep_going (ecs); | |
4759 | else | |
4760 | { | |
4761 | ecs->event_thread->stop_step = 1; | |
4762 | print_stop_reason (END_STEPPING_RANGE, 0); | |
4763 | stop_stepping (ecs); | |
4764 | } | |
4765 | return; | |
4766 | } | |
4767 | } | |
4768 | ||
4769 | /* Look for "calls" to inlined functions, part two. If we are still | |
4770 | in the same real function we were stepping through, but we have | |
4771 | to go further up to find the exact frame ID, we are stepping | |
4772 | through a more inlined call beyond its call site. */ | |
4773 | ||
4774 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
4775 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
4776 | ecs->event_thread->step_frame_id) | |
4777 | && stepped_in_from (get_current_frame (), | |
4778 | ecs->event_thread->step_frame_id)) | |
4779 | { | |
4780 | if (debug_infrun) | |
4781 | fprintf_unfiltered (gdb_stdlog, | |
4782 | "infrun: stepping through inlined function\n"); | |
4783 | ||
4784 | if (ecs->event_thread->step_over_calls == STEP_OVER_ALL) | |
4785 | keep_going (ecs); | |
4786 | else | |
4787 | { | |
4788 | ecs->event_thread->stop_step = 1; | |
4789 | print_stop_reason (END_STEPPING_RANGE, 0); | |
4790 | stop_stepping (ecs); | |
4791 | } | |
4792 | return; | |
4793 | } | |
4794 | ||
2afb61aa | 4795 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
4796 | && (ecs->event_thread->current_line != stop_pc_sal.line |
4797 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
4798 | { |
4799 | /* We are at the start of a different line. So stop. Note that | |
4800 | we don't stop if we step into the middle of a different line. | |
4801 | That is said to make things like for (;;) statements work | |
4802 | better. */ | |
527159b7 | 4803 | if (debug_infrun) |
8a9de0e4 | 4804 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n"); |
414c69f7 | 4805 | ecs->event_thread->stop_step = 1; |
488f131b JB |
4806 | print_stop_reason (END_STEPPING_RANGE, 0); |
4807 | stop_stepping (ecs); | |
4808 | return; | |
4809 | } | |
c906108c | 4810 | |
488f131b | 4811 | /* We aren't done stepping. |
c906108c | 4812 | |
488f131b JB |
4813 | Optimize by setting the stepping range to the line. |
4814 | (We might not be in the original line, but if we entered a | |
4815 | new line in mid-statement, we continue stepping. This makes | |
4816 | things like for(;;) statements work better.) */ | |
c906108c | 4817 | |
4e1c45ea PA |
4818 | ecs->event_thread->step_range_start = stop_pc_sal.pc; |
4819 | ecs->event_thread->step_range_end = stop_pc_sal.end; | |
edb3359d | 4820 | set_step_info (frame, stop_pc_sal); |
488f131b | 4821 | |
527159b7 | 4822 | if (debug_infrun) |
8a9de0e4 | 4823 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 4824 | keep_going (ecs); |
104c1213 JM |
4825 | } |
4826 | ||
b3444185 | 4827 | /* Is thread TP in the middle of single-stepping? */ |
104c1213 | 4828 | |
a7212384 | 4829 | static int |
b3444185 | 4830 | currently_stepping (struct thread_info *tp) |
a7212384 | 4831 | { |
b3444185 PA |
4832 | return ((tp->step_range_end && tp->step_resume_breakpoint == NULL) |
4833 | || tp->trap_expected | |
4834 | || tp->stepping_through_solib_after_catch | |
4835 | || bpstat_should_step ()); | |
a7212384 UW |
4836 | } |
4837 | ||
b3444185 PA |
4838 | /* Returns true if any thread *but* the one passed in "data" is in the |
4839 | middle of stepping or of handling a "next". */ | |
a7212384 | 4840 | |
104c1213 | 4841 | static int |
b3444185 | 4842 | currently_stepping_or_nexting_callback (struct thread_info *tp, void *data) |
104c1213 | 4843 | { |
b3444185 PA |
4844 | if (tp == data) |
4845 | return 0; | |
4846 | ||
4847 | return (tp->step_range_end | |
4848 | || tp->trap_expected | |
4849 | || tp->stepping_through_solib_after_catch); | |
104c1213 | 4850 | } |
c906108c | 4851 | |
b2175913 MS |
4852 | /* Inferior has stepped into a subroutine call with source code that |
4853 | we should not step over. Do step to the first line of code in | |
4854 | it. */ | |
c2c6d25f JM |
4855 | |
4856 | static void | |
568d6575 UW |
4857 | handle_step_into_function (struct gdbarch *gdbarch, |
4858 | struct execution_control_state *ecs) | |
c2c6d25f JM |
4859 | { |
4860 | struct symtab *s; | |
2afb61aa | 4861 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f JM |
4862 | |
4863 | s = find_pc_symtab (stop_pc); | |
4864 | if (s && s->language != language_asm) | |
568d6575 | 4865 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 | 4866 | ecs->stop_func_start); |
c2c6d25f | 4867 | |
2afb61aa | 4868 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
4869 | /* Use the step_resume_break to step until the end of the prologue, |
4870 | even if that involves jumps (as it seems to on the vax under | |
4871 | 4.2). */ | |
4872 | /* If the prologue ends in the middle of a source line, continue to | |
4873 | the end of that source line (if it is still within the function). | |
4874 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
4875 | if (stop_func_sal.end |
4876 | && stop_func_sal.pc != ecs->stop_func_start | |
4877 | && stop_func_sal.end < ecs->stop_func_end) | |
4878 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 4879 | |
2dbd5e30 KB |
4880 | /* Architectures which require breakpoint adjustment might not be able |
4881 | to place a breakpoint at the computed address. If so, the test | |
4882 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
4883 | ecs->stop_func_start to an address at which a breakpoint may be | |
4884 | legitimately placed. | |
8fb3e588 | 4885 | |
2dbd5e30 KB |
4886 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
4887 | made, GDB will enter an infinite loop when stepping through | |
4888 | optimized code consisting of VLIW instructions which contain | |
4889 | subinstructions corresponding to different source lines. On | |
4890 | FR-V, it's not permitted to place a breakpoint on any but the | |
4891 | first subinstruction of a VLIW instruction. When a breakpoint is | |
4892 | set, GDB will adjust the breakpoint address to the beginning of | |
4893 | the VLIW instruction. Thus, we need to make the corresponding | |
4894 | adjustment here when computing the stop address. */ | |
8fb3e588 | 4895 | |
568d6575 | 4896 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
4897 | { |
4898 | ecs->stop_func_start | |
568d6575 | 4899 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 4900 | ecs->stop_func_start); |
2dbd5e30 KB |
4901 | } |
4902 | ||
c2c6d25f JM |
4903 | if (ecs->stop_func_start == stop_pc) |
4904 | { | |
4905 | /* We are already there: stop now. */ | |
414c69f7 | 4906 | ecs->event_thread->stop_step = 1; |
488f131b | 4907 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
4908 | stop_stepping (ecs); |
4909 | return; | |
4910 | } | |
4911 | else | |
4912 | { | |
4913 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 4914 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
4915 | sr_sal.pc = ecs->stop_func_start; |
4916 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 4917 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 4918 | |
c2c6d25f | 4919 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
4920 | some machines the prologue is where the new fp value is |
4921 | established. */ | |
a6d9a66e | 4922 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
4923 | |
4924 | /* And make sure stepping stops right away then. */ | |
4e1c45ea | 4925 | ecs->event_thread->step_range_end = ecs->event_thread->step_range_start; |
c2c6d25f JM |
4926 | } |
4927 | keep_going (ecs); | |
4928 | } | |
d4f3574e | 4929 | |
b2175913 MS |
4930 | /* Inferior has stepped backward into a subroutine call with source |
4931 | code that we should not step over. Do step to the beginning of the | |
4932 | last line of code in it. */ | |
4933 | ||
4934 | static void | |
568d6575 UW |
4935 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
4936 | struct execution_control_state *ecs) | |
b2175913 MS |
4937 | { |
4938 | struct symtab *s; | |
167e4384 | 4939 | struct symtab_and_line stop_func_sal; |
b2175913 MS |
4940 | |
4941 | s = find_pc_symtab (stop_pc); | |
4942 | if (s && s->language != language_asm) | |
568d6575 | 4943 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 MS |
4944 | ecs->stop_func_start); |
4945 | ||
4946 | stop_func_sal = find_pc_line (stop_pc, 0); | |
4947 | ||
4948 | /* OK, we're just going to keep stepping here. */ | |
4949 | if (stop_func_sal.pc == stop_pc) | |
4950 | { | |
4951 | /* We're there already. Just stop stepping now. */ | |
4952 | ecs->event_thread->stop_step = 1; | |
4953 | print_stop_reason (END_STEPPING_RANGE, 0); | |
4954 | stop_stepping (ecs); | |
4955 | } | |
4956 | else | |
4957 | { | |
4958 | /* Else just reset the step range and keep going. | |
4959 | No step-resume breakpoint, they don't work for | |
4960 | epilogues, which can have multiple entry paths. */ | |
4961 | ecs->event_thread->step_range_start = stop_func_sal.pc; | |
4962 | ecs->event_thread->step_range_end = stop_func_sal.end; | |
4963 | keep_going (ecs); | |
4964 | } | |
4965 | return; | |
4966 | } | |
4967 | ||
d3169d93 | 4968 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
4969 | This is used to both functions and to skip over code. */ |
4970 | ||
4971 | static void | |
a6d9a66e UW |
4972 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
4973 | struct symtab_and_line sr_sal, | |
44cbf7b5 AC |
4974 | struct frame_id sr_id) |
4975 | { | |
611c83ae PA |
4976 | /* There should never be more than one step-resume or longjmp-resume |
4977 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 4978 | step_resume_breakpoint when one is already active. */ |
4e1c45ea | 4979 | gdb_assert (inferior_thread ()->step_resume_breakpoint == NULL); |
d3169d93 DJ |
4980 | |
4981 | if (debug_infrun) | |
4982 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
4983 | "infrun: inserting step-resume breakpoint at %s\n", |
4984 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 4985 | |
4e1c45ea | 4986 | inferior_thread ()->step_resume_breakpoint |
a6d9a66e | 4987 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, bp_step_resume); |
44cbf7b5 | 4988 | } |
7ce450bd | 4989 | |
d3169d93 | 4990 | /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used |
14e60db5 | 4991 | to skip a potential signal handler. |
7ce450bd | 4992 | |
14e60db5 DJ |
4993 | This is called with the interrupted function's frame. The signal |
4994 | handler, when it returns, will resume the interrupted function at | |
4995 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
4996 | |
4997 | static void | |
44cbf7b5 | 4998 | insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
4999 | { |
5000 | struct symtab_and_line sr_sal; | |
a6d9a66e | 5001 | struct gdbarch *gdbarch; |
d303a6c7 | 5002 | |
f4c1edd8 | 5003 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
5004 | init_sal (&sr_sal); /* initialize to zeros */ |
5005 | ||
a6d9a66e | 5006 | gdbarch = get_frame_arch (return_frame); |
568d6575 | 5007 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 5008 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5009 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 5010 | |
a6d9a66e UW |
5011 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
5012 | get_stack_frame_id (return_frame)); | |
d303a6c7 AC |
5013 | } |
5014 | ||
14e60db5 DJ |
5015 | /* Similar to insert_step_resume_breakpoint_at_frame, except |
5016 | but a breakpoint at the previous frame's PC. This is used to | |
5017 | skip a function after stepping into it (for "next" or if the called | |
5018 | function has no debugging information). | |
5019 | ||
5020 | The current function has almost always been reached by single | |
5021 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
5022 | current function, and the breakpoint will be set at the caller's | |
5023 | resume address. | |
5024 | ||
5025 | This is a separate function rather than reusing | |
5026 | insert_step_resume_breakpoint_at_frame in order to avoid | |
5027 | get_prev_frame, which may stop prematurely (see the implementation | |
c7ce8faa | 5028 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
5029 | |
5030 | static void | |
5031 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
5032 | { | |
5033 | struct symtab_and_line sr_sal; | |
a6d9a66e | 5034 | struct gdbarch *gdbarch; |
14e60db5 DJ |
5035 | |
5036 | /* We shouldn't have gotten here if we don't know where the call site | |
5037 | is. */ | |
c7ce8faa | 5038 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 DJ |
5039 | |
5040 | init_sal (&sr_sal); /* initialize to zeros */ | |
5041 | ||
a6d9a66e | 5042 | gdbarch = frame_unwind_caller_arch (next_frame); |
c7ce8faa DJ |
5043 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
5044 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 5045 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5046 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 5047 | |
a6d9a66e | 5048 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 5049 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
5050 | } |
5051 | ||
611c83ae PA |
5052 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
5053 | new breakpoint at the target of a jmp_buf. The handling of | |
5054 | longjmp-resume uses the same mechanisms used for handling | |
5055 | "step-resume" breakpoints. */ | |
5056 | ||
5057 | static void | |
a6d9a66e | 5058 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae PA |
5059 | { |
5060 | /* There should never be more than one step-resume or longjmp-resume | |
5061 | breakpoint per thread, so we should never be setting a new | |
5062 | longjmp_resume_breakpoint when one is already active. */ | |
4e1c45ea | 5063 | gdb_assert (inferior_thread ()->step_resume_breakpoint == NULL); |
611c83ae PA |
5064 | |
5065 | if (debug_infrun) | |
5066 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5067 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
5068 | paddress (gdbarch, pc)); | |
611c83ae | 5069 | |
4e1c45ea | 5070 | inferior_thread ()->step_resume_breakpoint = |
a6d9a66e | 5071 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); |
611c83ae PA |
5072 | } |
5073 | ||
104c1213 JM |
5074 | static void |
5075 | stop_stepping (struct execution_control_state *ecs) | |
5076 | { | |
527159b7 | 5077 | if (debug_infrun) |
8a9de0e4 | 5078 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
527159b7 | 5079 | |
cd0fc7c3 SS |
5080 | /* Let callers know we don't want to wait for the inferior anymore. */ |
5081 | ecs->wait_some_more = 0; | |
5082 | } | |
5083 | ||
d4f3574e SS |
5084 | /* This function handles various cases where we need to continue |
5085 | waiting for the inferior. */ | |
5086 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
5087 | ||
5088 | static void | |
5089 | keep_going (struct execution_control_state *ecs) | |
5090 | { | |
c4dbc9af PA |
5091 | /* Make sure normal_stop is called if we get a QUIT handled before |
5092 | reaching resume. */ | |
5093 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
5094 | ||
d4f3574e | 5095 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
5096 | ecs->event_thread->prev_pc |
5097 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 5098 | |
d4f3574e SS |
5099 | /* If we did not do break;, it means we should keep running the |
5100 | inferior and not return to debugger. */ | |
5101 | ||
2020b7ab PA |
5102 | if (ecs->event_thread->trap_expected |
5103 | && ecs->event_thread->stop_signal != TARGET_SIGNAL_TRAP) | |
d4f3574e SS |
5104 | { |
5105 | /* We took a signal (which we are supposed to pass through to | |
4e1c45ea PA |
5106 | the inferior, else we'd not get here) and we haven't yet |
5107 | gotten our trap. Simply continue. */ | |
c4dbc9af PA |
5108 | |
5109 | discard_cleanups (old_cleanups); | |
2020b7ab PA |
5110 | resume (currently_stepping (ecs->event_thread), |
5111 | ecs->event_thread->stop_signal); | |
d4f3574e SS |
5112 | } |
5113 | else | |
5114 | { | |
5115 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
5116 | anyway (the user asked that this signal be passed to the |
5117 | child) | |
5118 | -- or -- | |
5119 | The signal was SIGTRAP, e.g. it was our signal, but we | |
5120 | decided we should resume from it. | |
d4f3574e | 5121 | |
c36b740a | 5122 | We're going to run this baby now! |
d4f3574e | 5123 | |
c36b740a VP |
5124 | Note that insert_breakpoints won't try to re-insert |
5125 | already inserted breakpoints. Therefore, we don't | |
5126 | care if breakpoints were already inserted, or not. */ | |
5127 | ||
4e1c45ea | 5128 | if (ecs->event_thread->stepping_over_breakpoint) |
45e8c884 | 5129 | { |
9f5a595d | 5130 | struct regcache *thread_regcache = get_thread_regcache (ecs->ptid); |
abbb1732 | 5131 | |
9f5a595d | 5132 | if (!use_displaced_stepping (get_regcache_arch (thread_regcache))) |
237fc4c9 PA |
5133 | /* Since we can't do a displaced step, we have to remove |
5134 | the breakpoint while we step it. To keep things | |
5135 | simple, we remove them all. */ | |
5136 | remove_breakpoints (); | |
45e8c884 VP |
5137 | } |
5138 | else | |
d4f3574e | 5139 | { |
e236ba44 | 5140 | struct gdb_exception e; |
abbb1732 | 5141 | |
569631c6 UW |
5142 | /* Stop stepping when inserting breakpoints |
5143 | has failed. */ | |
e236ba44 VP |
5144 | TRY_CATCH (e, RETURN_MASK_ERROR) |
5145 | { | |
5146 | insert_breakpoints (); | |
5147 | } | |
5148 | if (e.reason < 0) | |
d4f3574e | 5149 | { |
97bd5475 | 5150 | exception_print (gdb_stderr, e); |
d4f3574e SS |
5151 | stop_stepping (ecs); |
5152 | return; | |
5153 | } | |
d4f3574e SS |
5154 | } |
5155 | ||
4e1c45ea | 5156 | ecs->event_thread->trap_expected = ecs->event_thread->stepping_over_breakpoint; |
d4f3574e SS |
5157 | |
5158 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
5159 | specifies that such a signal should be delivered to the |
5160 | target program). | |
5161 | ||
5162 | Typically, this would occure when a user is debugging a | |
5163 | target monitor on a simulator: the target monitor sets a | |
5164 | breakpoint; the simulator encounters this break-point and | |
5165 | halts the simulation handing control to GDB; GDB, noteing | |
5166 | that the break-point isn't valid, returns control back to the | |
5167 | simulator; the simulator then delivers the hardware | |
5168 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
5169 | ||
2020b7ab PA |
5170 | if (ecs->event_thread->stop_signal == TARGET_SIGNAL_TRAP |
5171 | && !signal_program[ecs->event_thread->stop_signal]) | |
5172 | ecs->event_thread->stop_signal = TARGET_SIGNAL_0; | |
d4f3574e | 5173 | |
c4dbc9af | 5174 | discard_cleanups (old_cleanups); |
2020b7ab PA |
5175 | resume (currently_stepping (ecs->event_thread), |
5176 | ecs->event_thread->stop_signal); | |
d4f3574e SS |
5177 | } |
5178 | ||
488f131b | 5179 | prepare_to_wait (ecs); |
d4f3574e SS |
5180 | } |
5181 | ||
104c1213 JM |
5182 | /* This function normally comes after a resume, before |
5183 | handle_inferior_event exits. It takes care of any last bits of | |
5184 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 5185 | |
104c1213 JM |
5186 | static void |
5187 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 5188 | { |
527159b7 | 5189 | if (debug_infrun) |
8a9de0e4 | 5190 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 5191 | |
104c1213 JM |
5192 | /* This is the old end of the while loop. Let everybody know we |
5193 | want to wait for the inferior some more and get called again | |
5194 | soon. */ | |
5195 | ecs->wait_some_more = 1; | |
c906108c | 5196 | } |
11cf8741 JM |
5197 | |
5198 | /* Print why the inferior has stopped. We always print something when | |
5199 | the inferior exits, or receives a signal. The rest of the cases are | |
5200 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
5201 | there should be a call to this function from handle_inferior_event() | |
5202 | each time stop_stepping() is called.*/ | |
5203 | static void | |
5204 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
5205 | { | |
5206 | switch (stop_reason) | |
5207 | { | |
11cf8741 JM |
5208 | case END_STEPPING_RANGE: |
5209 | /* We are done with a step/next/si/ni command. */ | |
5210 | /* For now print nothing. */ | |
fb40c209 | 5211 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 5212 | operation for n > 1 */ |
414c69f7 PA |
5213 | if (!inferior_thread ()->step_multi |
5214 | || !inferior_thread ()->stop_step) | |
9dc5e2a9 | 5215 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
5216 | ui_out_field_string |
5217 | (uiout, "reason", | |
5218 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
11cf8741 | 5219 | break; |
11cf8741 JM |
5220 | case SIGNAL_EXITED: |
5221 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 5222 | annotate_signalled (); |
9dc5e2a9 | 5223 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
5224 | ui_out_field_string |
5225 | (uiout, "reason", | |
5226 | async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8b93c638 JM |
5227 | ui_out_text (uiout, "\nProgram terminated with signal "); |
5228 | annotate_signal_name (); | |
488f131b JB |
5229 | ui_out_field_string (uiout, "signal-name", |
5230 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
5231 | annotate_signal_name_end (); |
5232 | ui_out_text (uiout, ", "); | |
5233 | annotate_signal_string (); | |
488f131b JB |
5234 | ui_out_field_string (uiout, "signal-meaning", |
5235 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
5236 | annotate_signal_string_end (); |
5237 | ui_out_text (uiout, ".\n"); | |
5238 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
5239 | break; |
5240 | case EXITED: | |
5241 | /* The inferior program is finished. */ | |
8b93c638 JM |
5242 | annotate_exited (stop_info); |
5243 | if (stop_info) | |
5244 | { | |
9dc5e2a9 | 5245 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
5246 | ui_out_field_string (uiout, "reason", |
5247 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
8b93c638 | 5248 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
5249 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
5250 | (unsigned int) stop_info); | |
8b93c638 JM |
5251 | ui_out_text (uiout, ".\n"); |
5252 | } | |
5253 | else | |
5254 | { | |
9dc5e2a9 | 5255 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
5256 | ui_out_field_string |
5257 | (uiout, "reason", | |
5258 | async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
8b93c638 JM |
5259 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
5260 | } | |
f17517ea AS |
5261 | /* Support the --return-child-result option. */ |
5262 | return_child_result_value = stop_info; | |
11cf8741 JM |
5263 | break; |
5264 | case SIGNAL_RECEIVED: | |
252fbfc8 PA |
5265 | /* Signal received. The signal table tells us to print about |
5266 | it. */ | |
8b93c638 | 5267 | annotate_signal (); |
252fbfc8 PA |
5268 | |
5269 | if (stop_info == TARGET_SIGNAL_0 && !ui_out_is_mi_like_p (uiout)) | |
5270 | { | |
5271 | struct thread_info *t = inferior_thread (); | |
5272 | ||
5273 | ui_out_text (uiout, "\n["); | |
5274 | ui_out_field_string (uiout, "thread-name", | |
5275 | target_pid_to_str (t->ptid)); | |
5276 | ui_out_field_fmt (uiout, "thread-id", "] #%d", t->num); | |
5277 | ui_out_text (uiout, " stopped"); | |
5278 | } | |
5279 | else | |
5280 | { | |
5281 | ui_out_text (uiout, "\nProgram received signal "); | |
5282 | annotate_signal_name (); | |
5283 | if (ui_out_is_mi_like_p (uiout)) | |
5284 | ui_out_field_string | |
5285 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
5286 | ui_out_field_string (uiout, "signal-name", | |
5287 | target_signal_to_name (stop_info)); | |
5288 | annotate_signal_name_end (); | |
5289 | ui_out_text (uiout, ", "); | |
5290 | annotate_signal_string (); | |
5291 | ui_out_field_string (uiout, "signal-meaning", | |
5292 | target_signal_to_string (stop_info)); | |
5293 | annotate_signal_string_end (); | |
5294 | } | |
8b93c638 | 5295 | ui_out_text (uiout, ".\n"); |
11cf8741 | 5296 | break; |
b2175913 MS |
5297 | case NO_HISTORY: |
5298 | /* Reverse execution: target ran out of history info. */ | |
5299 | ui_out_text (uiout, "\nNo more reverse-execution history.\n"); | |
5300 | break; | |
11cf8741 | 5301 | default: |
8e65ff28 | 5302 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 5303 | _("print_stop_reason: unrecognized enum value")); |
11cf8741 JM |
5304 | break; |
5305 | } | |
5306 | } | |
c906108c | 5307 | \f |
43ff13b4 | 5308 | |
c906108c SS |
5309 | /* Here to return control to GDB when the inferior stops for real. |
5310 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
5311 | ||
5312 | STOP_PRINT_FRAME nonzero means print the executing frame | |
5313 | (pc, function, args, file, line number and line text). | |
5314 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
5315 | attempting to insert breakpoints. */ | |
5316 | ||
5317 | void | |
96baa820 | 5318 | normal_stop (void) |
c906108c | 5319 | { |
73b65bb0 DJ |
5320 | struct target_waitstatus last; |
5321 | ptid_t last_ptid; | |
29f49a6a | 5322 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
73b65bb0 DJ |
5323 | |
5324 | get_last_target_status (&last_ptid, &last); | |
5325 | ||
29f49a6a PA |
5326 | /* If an exception is thrown from this point on, make sure to |
5327 | propagate GDB's knowledge of the executing state to the | |
5328 | frontend/user running state. A QUIT is an easy exception to see | |
5329 | here, so do this before any filtered output. */ | |
c35b1492 PA |
5330 | if (!non_stop) |
5331 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
5332 | else if (last.kind != TARGET_WAITKIND_SIGNALLED | |
5333 | && last.kind != TARGET_WAITKIND_EXITED) | |
5334 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); | |
29f49a6a | 5335 | |
4f8d22e3 PA |
5336 | /* In non-stop mode, we don't want GDB to switch threads behind the |
5337 | user's back, to avoid races where the user is typing a command to | |
5338 | apply to thread x, but GDB switches to thread y before the user | |
5339 | finishes entering the command. */ | |
5340 | ||
c906108c SS |
5341 | /* As with the notification of thread events, we want to delay |
5342 | notifying the user that we've switched thread context until | |
5343 | the inferior actually stops. | |
5344 | ||
73b65bb0 DJ |
5345 | There's no point in saying anything if the inferior has exited. |
5346 | Note that SIGNALLED here means "exited with a signal", not | |
5347 | "received a signal". */ | |
4f8d22e3 PA |
5348 | if (!non_stop |
5349 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
5350 | && target_has_execution |
5351 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
5352 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
5353 | { |
5354 | target_terminal_ours_for_output (); | |
a3f17187 | 5355 | printf_filtered (_("[Switching to %s]\n"), |
c95310c6 | 5356 | target_pid_to_str (inferior_ptid)); |
b8fa951a | 5357 | annotate_thread_changed (); |
39f77062 | 5358 | previous_inferior_ptid = inferior_ptid; |
c906108c | 5359 | } |
c906108c | 5360 | |
74960c60 | 5361 | if (!breakpoints_always_inserted_mode () && target_has_execution) |
c906108c SS |
5362 | { |
5363 | if (remove_breakpoints ()) | |
5364 | { | |
5365 | target_terminal_ours_for_output (); | |
a3f17187 AC |
5366 | printf_filtered (_("\ |
5367 | Cannot remove breakpoints because program is no longer writable.\n\ | |
a3f17187 | 5368 | Further execution is probably impossible.\n")); |
c906108c SS |
5369 | } |
5370 | } | |
c906108c | 5371 | |
c906108c SS |
5372 | /* If an auto-display called a function and that got a signal, |
5373 | delete that auto-display to avoid an infinite recursion. */ | |
5374 | ||
5375 | if (stopped_by_random_signal) | |
5376 | disable_current_display (); | |
5377 | ||
5378 | /* Don't print a message if in the middle of doing a "step n" | |
5379 | operation for n > 1 */ | |
af679fd0 PA |
5380 | if (target_has_execution |
5381 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
5382 | && last.kind != TARGET_WAITKIND_EXITED | |
5383 | && inferior_thread ()->step_multi | |
414c69f7 | 5384 | && inferior_thread ()->stop_step) |
c906108c SS |
5385 | goto done; |
5386 | ||
5387 | target_terminal_ours (); | |
5388 | ||
7abfe014 DJ |
5389 | /* Set the current source location. This will also happen if we |
5390 | display the frame below, but the current SAL will be incorrect | |
5391 | during a user hook-stop function. */ | |
d729566a | 5392 | if (has_stack_frames () && !stop_stack_dummy) |
7abfe014 DJ |
5393 | set_current_sal_from_frame (get_current_frame (), 1); |
5394 | ||
dd7e2d2b PA |
5395 | /* Let the user/frontend see the threads as stopped. */ |
5396 | do_cleanups (old_chain); | |
5397 | ||
5398 | /* Look up the hook_stop and run it (CLI internally handles problem | |
5399 | of stop_command's pre-hook not existing). */ | |
5400 | if (stop_command) | |
5401 | catch_errors (hook_stop_stub, stop_command, | |
5402 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
5403 | ||
d729566a | 5404 | if (!has_stack_frames ()) |
d51fd4c8 | 5405 | goto done; |
c906108c | 5406 | |
32400beb PA |
5407 | if (last.kind == TARGET_WAITKIND_SIGNALLED |
5408 | || last.kind == TARGET_WAITKIND_EXITED) | |
5409 | goto done; | |
5410 | ||
c906108c SS |
5411 | /* Select innermost stack frame - i.e., current frame is frame 0, |
5412 | and current location is based on that. | |
5413 | Don't do this on return from a stack dummy routine, | |
5414 | or if the program has exited. */ | |
5415 | ||
5416 | if (!stop_stack_dummy) | |
5417 | { | |
0f7d239c | 5418 | select_frame (get_current_frame ()); |
c906108c SS |
5419 | |
5420 | /* Print current location without a level number, if | |
c5aa993b JM |
5421 | we have changed functions or hit a breakpoint. |
5422 | Print source line if we have one. | |
5423 | bpstat_print() contains the logic deciding in detail | |
5424 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 5425 | |
d01a8610 AS |
5426 | /* If --batch-silent is enabled then there's no need to print the current |
5427 | source location, and to try risks causing an error message about | |
5428 | missing source files. */ | |
5429 | if (stop_print_frame && !batch_silent) | |
c906108c SS |
5430 | { |
5431 | int bpstat_ret; | |
5432 | int source_flag; | |
917317f4 | 5433 | int do_frame_printing = 1; |
347bddb7 | 5434 | struct thread_info *tp = inferior_thread (); |
c906108c | 5435 | |
347bddb7 | 5436 | bpstat_ret = bpstat_print (tp->stop_bpstat); |
917317f4 JM |
5437 | switch (bpstat_ret) |
5438 | { | |
5439 | case PRINT_UNKNOWN: | |
b0f4b84b DJ |
5440 | /* If we had hit a shared library event breakpoint, |
5441 | bpstat_print would print out this message. If we hit | |
5442 | an OS-level shared library event, do the same | |
5443 | thing. */ | |
5444 | if (last.kind == TARGET_WAITKIND_LOADED) | |
5445 | { | |
5446 | printf_filtered (_("Stopped due to shared library event\n")); | |
5447 | source_flag = SRC_LINE; /* something bogus */ | |
5448 | do_frame_printing = 0; | |
5449 | break; | |
5450 | } | |
5451 | ||
aa0cd9c1 | 5452 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
5453 | (or should) carry around the function and does (or |
5454 | should) use that when doing a frame comparison. */ | |
414c69f7 | 5455 | if (tp->stop_step |
347bddb7 | 5456 | && frame_id_eq (tp->step_frame_id, |
aa0cd9c1 | 5457 | get_frame_id (get_current_frame ())) |
917317f4 | 5458 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 5459 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 5460 | else |
488f131b | 5461 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
5462 | break; |
5463 | case PRINT_SRC_AND_LOC: | |
488f131b | 5464 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
5465 | break; |
5466 | case PRINT_SRC_ONLY: | |
c5394b80 | 5467 | source_flag = SRC_LINE; |
917317f4 JM |
5468 | break; |
5469 | case PRINT_NOTHING: | |
488f131b | 5470 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
5471 | do_frame_printing = 0; |
5472 | break; | |
5473 | default: | |
e2e0b3e5 | 5474 | internal_error (__FILE__, __LINE__, _("Unknown value.")); |
917317f4 | 5475 | } |
c906108c SS |
5476 | |
5477 | /* The behavior of this routine with respect to the source | |
5478 | flag is: | |
c5394b80 JM |
5479 | SRC_LINE: Print only source line |
5480 | LOCATION: Print only location | |
5481 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 5482 | if (do_frame_printing) |
b04f3ab4 | 5483 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
5484 | |
5485 | /* Display the auto-display expressions. */ | |
5486 | do_displays (); | |
5487 | } | |
5488 | } | |
5489 | ||
5490 | /* Save the function value return registers, if we care. | |
5491 | We might be about to restore their previous contents. */ | |
32400beb | 5492 | if (inferior_thread ()->proceed_to_finish) |
d5c31457 UW |
5493 | { |
5494 | /* This should not be necessary. */ | |
5495 | if (stop_registers) | |
5496 | regcache_xfree (stop_registers); | |
5497 | ||
5498 | /* NB: The copy goes through to the target picking up the value of | |
5499 | all the registers. */ | |
5500 | stop_registers = regcache_dup (get_current_regcache ()); | |
5501 | } | |
c906108c | 5502 | |
aa7d318d | 5503 | if (stop_stack_dummy == STOP_STACK_DUMMY) |
c906108c | 5504 | { |
b89667eb DE |
5505 | /* Pop the empty frame that contains the stack dummy. |
5506 | This also restores inferior state prior to the call | |
5507 | (struct inferior_thread_state). */ | |
5508 | struct frame_info *frame = get_current_frame (); | |
abbb1732 | 5509 | |
b89667eb DE |
5510 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); |
5511 | frame_pop (frame); | |
5512 | /* frame_pop() calls reinit_frame_cache as the last thing it does | |
5513 | which means there's currently no selected frame. We don't need | |
5514 | to re-establish a selected frame if the dummy call returns normally, | |
5515 | that will be done by restore_inferior_status. However, we do have | |
5516 | to handle the case where the dummy call is returning after being | |
5517 | stopped (e.g. the dummy call previously hit a breakpoint). We | |
5518 | can't know which case we have so just always re-establish a | |
5519 | selected frame here. */ | |
0f7d239c | 5520 | select_frame (get_current_frame ()); |
c906108c SS |
5521 | } |
5522 | ||
c906108c SS |
5523 | done: |
5524 | annotate_stopped (); | |
41d2bdb4 PA |
5525 | |
5526 | /* Suppress the stop observer if we're in the middle of: | |
5527 | ||
5528 | - a step n (n > 1), as there still more steps to be done. | |
5529 | ||
5530 | - a "finish" command, as the observer will be called in | |
5531 | finish_command_continuation, so it can include the inferior | |
5532 | function's return value. | |
5533 | ||
5534 | - calling an inferior function, as we pretend we inferior didn't | |
5535 | run at all. The return value of the call is handled by the | |
5536 | expression evaluator, through call_function_by_hand. */ | |
5537 | ||
5538 | if (!target_has_execution | |
5539 | || last.kind == TARGET_WAITKIND_SIGNALLED | |
5540 | || last.kind == TARGET_WAITKIND_EXITED | |
5541 | || (!inferior_thread ()->step_multi | |
5542 | && !(inferior_thread ()->stop_bpstat | |
c5a4d20b PA |
5543 | && inferior_thread ()->proceed_to_finish) |
5544 | && !inferior_thread ()->in_infcall)) | |
347bddb7 PA |
5545 | { |
5546 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
1d33d6ba VP |
5547 | observer_notify_normal_stop (inferior_thread ()->stop_bpstat, |
5548 | stop_print_frame); | |
347bddb7 | 5549 | else |
1d33d6ba | 5550 | observer_notify_normal_stop (NULL, stop_print_frame); |
347bddb7 | 5551 | } |
347bddb7 | 5552 | |
48844aa6 PA |
5553 | if (target_has_execution) |
5554 | { | |
5555 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
5556 | && last.kind != TARGET_WAITKIND_EXITED) | |
5557 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
5558 | Delete any breakpoint that is to be deleted at the next stop. */ | |
5559 | breakpoint_auto_delete (inferior_thread ()->stop_bpstat); | |
94cc34af | 5560 | } |
6c95b8df PA |
5561 | |
5562 | /* Try to get rid of automatically added inferiors that are no | |
5563 | longer needed. Keeping those around slows down things linearly. | |
5564 | Note that this never removes the current inferior. */ | |
5565 | prune_inferiors (); | |
c906108c SS |
5566 | } |
5567 | ||
5568 | static int | |
96baa820 | 5569 | hook_stop_stub (void *cmd) |
c906108c | 5570 | { |
5913bcb0 | 5571 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
5572 | return (0); |
5573 | } | |
5574 | \f | |
c5aa993b | 5575 | int |
96baa820 | 5576 | signal_stop_state (int signo) |
c906108c | 5577 | { |
d6b48e9c | 5578 | return signal_stop[signo]; |
c906108c SS |
5579 | } |
5580 | ||
c5aa993b | 5581 | int |
96baa820 | 5582 | signal_print_state (int signo) |
c906108c SS |
5583 | { |
5584 | return signal_print[signo]; | |
5585 | } | |
5586 | ||
c5aa993b | 5587 | int |
96baa820 | 5588 | signal_pass_state (int signo) |
c906108c SS |
5589 | { |
5590 | return signal_program[signo]; | |
5591 | } | |
5592 | ||
488f131b | 5593 | int |
7bda5e4a | 5594 | signal_stop_update (int signo, int state) |
d4f3574e SS |
5595 | { |
5596 | int ret = signal_stop[signo]; | |
abbb1732 | 5597 | |
d4f3574e SS |
5598 | signal_stop[signo] = state; |
5599 | return ret; | |
5600 | } | |
5601 | ||
488f131b | 5602 | int |
7bda5e4a | 5603 | signal_print_update (int signo, int state) |
d4f3574e SS |
5604 | { |
5605 | int ret = signal_print[signo]; | |
abbb1732 | 5606 | |
d4f3574e SS |
5607 | signal_print[signo] = state; |
5608 | return ret; | |
5609 | } | |
5610 | ||
488f131b | 5611 | int |
7bda5e4a | 5612 | signal_pass_update (int signo, int state) |
d4f3574e SS |
5613 | { |
5614 | int ret = signal_program[signo]; | |
abbb1732 | 5615 | |
d4f3574e SS |
5616 | signal_program[signo] = state; |
5617 | return ret; | |
5618 | } | |
5619 | ||
c906108c | 5620 | static void |
96baa820 | 5621 | sig_print_header (void) |
c906108c | 5622 | { |
a3f17187 AC |
5623 | printf_filtered (_("\ |
5624 | Signal Stop\tPrint\tPass to program\tDescription\n")); | |
c906108c SS |
5625 | } |
5626 | ||
5627 | static void | |
96baa820 | 5628 | sig_print_info (enum target_signal oursig) |
c906108c | 5629 | { |
54363045 | 5630 | const char *name = target_signal_to_name (oursig); |
c906108c | 5631 | int name_padding = 13 - strlen (name); |
96baa820 | 5632 | |
c906108c SS |
5633 | if (name_padding <= 0) |
5634 | name_padding = 0; | |
5635 | ||
5636 | printf_filtered ("%s", name); | |
488f131b | 5637 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
5638 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
5639 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
5640 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
5641 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
5642 | } | |
5643 | ||
5644 | /* Specify how various signals in the inferior should be handled. */ | |
5645 | ||
5646 | static void | |
96baa820 | 5647 | handle_command (char *args, int from_tty) |
c906108c SS |
5648 | { |
5649 | char **argv; | |
5650 | int digits, wordlen; | |
5651 | int sigfirst, signum, siglast; | |
5652 | enum target_signal oursig; | |
5653 | int allsigs; | |
5654 | int nsigs; | |
5655 | unsigned char *sigs; | |
5656 | struct cleanup *old_chain; | |
5657 | ||
5658 | if (args == NULL) | |
5659 | { | |
e2e0b3e5 | 5660 | error_no_arg (_("signal to handle")); |
c906108c SS |
5661 | } |
5662 | ||
5663 | /* Allocate and zero an array of flags for which signals to handle. */ | |
5664 | ||
5665 | nsigs = (int) TARGET_SIGNAL_LAST; | |
5666 | sigs = (unsigned char *) alloca (nsigs); | |
5667 | memset (sigs, 0, nsigs); | |
5668 | ||
5669 | /* Break the command line up into args. */ | |
5670 | ||
d1a41061 | 5671 | argv = gdb_buildargv (args); |
7a292a7a | 5672 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
5673 | |
5674 | /* Walk through the args, looking for signal oursigs, signal names, and | |
5675 | actions. Signal numbers and signal names may be interspersed with | |
5676 | actions, with the actions being performed for all signals cumulatively | |
5677 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
5678 | ||
5679 | while (*argv != NULL) | |
5680 | { | |
5681 | wordlen = strlen (*argv); | |
5682 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
5683 | {; | |
5684 | } | |
5685 | allsigs = 0; | |
5686 | sigfirst = siglast = -1; | |
5687 | ||
5688 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
5689 | { | |
5690 | /* Apply action to all signals except those used by the | |
5691 | debugger. Silently skip those. */ | |
5692 | allsigs = 1; | |
5693 | sigfirst = 0; | |
5694 | siglast = nsigs - 1; | |
5695 | } | |
5696 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
5697 | { | |
5698 | SET_SIGS (nsigs, sigs, signal_stop); | |
5699 | SET_SIGS (nsigs, sigs, signal_print); | |
5700 | } | |
5701 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
5702 | { | |
5703 | UNSET_SIGS (nsigs, sigs, signal_program); | |
5704 | } | |
5705 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
5706 | { | |
5707 | SET_SIGS (nsigs, sigs, signal_print); | |
5708 | } | |
5709 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
5710 | { | |
5711 | SET_SIGS (nsigs, sigs, signal_program); | |
5712 | } | |
5713 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
5714 | { | |
5715 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
5716 | } | |
5717 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
5718 | { | |
5719 | SET_SIGS (nsigs, sigs, signal_program); | |
5720 | } | |
5721 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
5722 | { | |
5723 | UNSET_SIGS (nsigs, sigs, signal_print); | |
5724 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
5725 | } | |
5726 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
5727 | { | |
5728 | UNSET_SIGS (nsigs, sigs, signal_program); | |
5729 | } | |
5730 | else if (digits > 0) | |
5731 | { | |
5732 | /* It is numeric. The numeric signal refers to our own | |
5733 | internal signal numbering from target.h, not to host/target | |
5734 | signal number. This is a feature; users really should be | |
5735 | using symbolic names anyway, and the common ones like | |
5736 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
5737 | ||
5738 | sigfirst = siglast = (int) | |
5739 | target_signal_from_command (atoi (*argv)); | |
5740 | if ((*argv)[digits] == '-') | |
5741 | { | |
5742 | siglast = (int) | |
5743 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
5744 | } | |
5745 | if (sigfirst > siglast) | |
5746 | { | |
5747 | /* Bet he didn't figure we'd think of this case... */ | |
5748 | signum = sigfirst; | |
5749 | sigfirst = siglast; | |
5750 | siglast = signum; | |
5751 | } | |
5752 | } | |
5753 | else | |
5754 | { | |
5755 | oursig = target_signal_from_name (*argv); | |
5756 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
5757 | { | |
5758 | sigfirst = siglast = (int) oursig; | |
5759 | } | |
5760 | else | |
5761 | { | |
5762 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 5763 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
5764 | } |
5765 | } | |
5766 | ||
5767 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 5768 | which signals to apply actions to. */ |
c906108c SS |
5769 | |
5770 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
5771 | { | |
5772 | switch ((enum target_signal) signum) | |
5773 | { | |
5774 | case TARGET_SIGNAL_TRAP: | |
5775 | case TARGET_SIGNAL_INT: | |
5776 | if (!allsigs && !sigs[signum]) | |
5777 | { | |
9e2f0ad4 HZ |
5778 | if (query (_("%s is used by the debugger.\n\ |
5779 | Are you sure you want to change it? "), target_signal_to_name ((enum target_signal) signum))) | |
c906108c SS |
5780 | { |
5781 | sigs[signum] = 1; | |
5782 | } | |
5783 | else | |
5784 | { | |
a3f17187 | 5785 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
5786 | gdb_flush (gdb_stdout); |
5787 | } | |
5788 | } | |
5789 | break; | |
5790 | case TARGET_SIGNAL_0: | |
5791 | case TARGET_SIGNAL_DEFAULT: | |
5792 | case TARGET_SIGNAL_UNKNOWN: | |
5793 | /* Make sure that "all" doesn't print these. */ | |
5794 | break; | |
5795 | default: | |
5796 | sigs[signum] = 1; | |
5797 | break; | |
5798 | } | |
5799 | } | |
5800 | ||
5801 | argv++; | |
5802 | } | |
5803 | ||
3a031f65 PA |
5804 | for (signum = 0; signum < nsigs; signum++) |
5805 | if (sigs[signum]) | |
5806 | { | |
5807 | target_notice_signals (inferior_ptid); | |
c906108c | 5808 | |
3a031f65 PA |
5809 | if (from_tty) |
5810 | { | |
5811 | /* Show the results. */ | |
5812 | sig_print_header (); | |
5813 | for (; signum < nsigs; signum++) | |
5814 | if (sigs[signum]) | |
5815 | sig_print_info (signum); | |
5816 | } | |
5817 | ||
5818 | break; | |
5819 | } | |
c906108c SS |
5820 | |
5821 | do_cleanups (old_chain); | |
5822 | } | |
5823 | ||
5824 | static void | |
96baa820 | 5825 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
5826 | { |
5827 | char **argv; | |
5828 | struct cleanup *old_chain; | |
5829 | ||
d1a41061 PP |
5830 | if (args == NULL) |
5831 | error_no_arg (_("xdb command")); | |
5832 | ||
c906108c SS |
5833 | /* Break the command line up into args. */ |
5834 | ||
d1a41061 | 5835 | argv = gdb_buildargv (args); |
7a292a7a | 5836 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
5837 | if (argv[1] != (char *) NULL) |
5838 | { | |
5839 | char *argBuf; | |
5840 | int bufLen; | |
5841 | ||
5842 | bufLen = strlen (argv[0]) + 20; | |
5843 | argBuf = (char *) xmalloc (bufLen); | |
5844 | if (argBuf) | |
5845 | { | |
5846 | int validFlag = 1; | |
5847 | enum target_signal oursig; | |
5848 | ||
5849 | oursig = target_signal_from_name (argv[0]); | |
5850 | memset (argBuf, 0, bufLen); | |
5851 | if (strcmp (argv[1], "Q") == 0) | |
5852 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
5853 | else | |
5854 | { | |
5855 | if (strcmp (argv[1], "s") == 0) | |
5856 | { | |
5857 | if (!signal_stop[oursig]) | |
5858 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
5859 | else | |
5860 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
5861 | } | |
5862 | else if (strcmp (argv[1], "i") == 0) | |
5863 | { | |
5864 | if (!signal_program[oursig]) | |
5865 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
5866 | else | |
5867 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
5868 | } | |
5869 | else if (strcmp (argv[1], "r") == 0) | |
5870 | { | |
5871 | if (!signal_print[oursig]) | |
5872 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
5873 | else | |
5874 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
5875 | } | |
5876 | else | |
5877 | validFlag = 0; | |
5878 | } | |
5879 | if (validFlag) | |
5880 | handle_command (argBuf, from_tty); | |
5881 | else | |
a3f17187 | 5882 | printf_filtered (_("Invalid signal handling flag.\n")); |
c906108c | 5883 | if (argBuf) |
b8c9b27d | 5884 | xfree (argBuf); |
c906108c SS |
5885 | } |
5886 | } | |
5887 | do_cleanups (old_chain); | |
5888 | } | |
5889 | ||
5890 | /* Print current contents of the tables set by the handle command. | |
5891 | It is possible we should just be printing signals actually used | |
5892 | by the current target (but for things to work right when switching | |
5893 | targets, all signals should be in the signal tables). */ | |
5894 | ||
5895 | static void | |
96baa820 | 5896 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
5897 | { |
5898 | enum target_signal oursig; | |
abbb1732 | 5899 | |
c906108c SS |
5900 | sig_print_header (); |
5901 | ||
5902 | if (signum_exp) | |
5903 | { | |
5904 | /* First see if this is a symbol name. */ | |
5905 | oursig = target_signal_from_name (signum_exp); | |
5906 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
5907 | { | |
5908 | /* No, try numeric. */ | |
5909 | oursig = | |
bb518678 | 5910 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
5911 | } |
5912 | sig_print_info (oursig); | |
5913 | return; | |
5914 | } | |
5915 | ||
5916 | printf_filtered ("\n"); | |
5917 | /* These ugly casts brought to you by the native VAX compiler. */ | |
5918 | for (oursig = TARGET_SIGNAL_FIRST; | |
5919 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
5920 | oursig = (enum target_signal) ((int) oursig + 1)) | |
5921 | { | |
5922 | QUIT; | |
5923 | ||
5924 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 5925 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
5926 | sig_print_info (oursig); |
5927 | } | |
5928 | ||
a3f17187 | 5929 | printf_filtered (_("\nUse the \"handle\" command to change these tables.\n")); |
c906108c | 5930 | } |
4aa995e1 PA |
5931 | |
5932 | /* The $_siginfo convenience variable is a bit special. We don't know | |
5933 | for sure the type of the value until we actually have a chance to | |
5934 | fetch the data. The type can change depending on gdbarch, so it it | |
5935 | also dependent on which thread you have selected. | |
5936 | ||
5937 | 1. making $_siginfo be an internalvar that creates a new value on | |
5938 | access. | |
5939 | ||
5940 | 2. making the value of $_siginfo be an lval_computed value. */ | |
5941 | ||
5942 | /* This function implements the lval_computed support for reading a | |
5943 | $_siginfo value. */ | |
5944 | ||
5945 | static void | |
5946 | siginfo_value_read (struct value *v) | |
5947 | { | |
5948 | LONGEST transferred; | |
5949 | ||
5950 | transferred = | |
5951 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
5952 | NULL, | |
5953 | value_contents_all_raw (v), | |
5954 | value_offset (v), | |
5955 | TYPE_LENGTH (value_type (v))); | |
5956 | ||
5957 | if (transferred != TYPE_LENGTH (value_type (v))) | |
5958 | error (_("Unable to read siginfo")); | |
5959 | } | |
5960 | ||
5961 | /* This function implements the lval_computed support for writing a | |
5962 | $_siginfo value. */ | |
5963 | ||
5964 | static void | |
5965 | siginfo_value_write (struct value *v, struct value *fromval) | |
5966 | { | |
5967 | LONGEST transferred; | |
5968 | ||
5969 | transferred = target_write (¤t_target, | |
5970 | TARGET_OBJECT_SIGNAL_INFO, | |
5971 | NULL, | |
5972 | value_contents_all_raw (fromval), | |
5973 | value_offset (v), | |
5974 | TYPE_LENGTH (value_type (fromval))); | |
5975 | ||
5976 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
5977 | error (_("Unable to write siginfo")); | |
5978 | } | |
5979 | ||
5980 | static struct lval_funcs siginfo_value_funcs = | |
5981 | { | |
5982 | siginfo_value_read, | |
5983 | siginfo_value_write | |
5984 | }; | |
5985 | ||
5986 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
5987 | the current thread using architecture GDBARCH. Return a void value |
5988 | if there's no object available. */ | |
4aa995e1 | 5989 | |
2c0b251b | 5990 | static struct value * |
78267919 | 5991 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var) |
4aa995e1 | 5992 | { |
4aa995e1 | 5993 | if (target_has_stack |
78267919 UW |
5994 | && !ptid_equal (inferior_ptid, null_ptid) |
5995 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
4aa995e1 | 5996 | { |
78267919 | 5997 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 5998 | |
78267919 | 5999 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
6000 | } |
6001 | ||
78267919 | 6002 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
6003 | } |
6004 | ||
c906108c | 6005 | \f |
b89667eb DE |
6006 | /* Inferior thread state. |
6007 | These are details related to the inferior itself, and don't include | |
6008 | things like what frame the user had selected or what gdb was doing | |
6009 | with the target at the time. | |
6010 | For inferior function calls these are things we want to restore | |
6011 | regardless of whether the function call successfully completes | |
6012 | or the dummy frame has to be manually popped. */ | |
6013 | ||
6014 | struct inferior_thread_state | |
7a292a7a SS |
6015 | { |
6016 | enum target_signal stop_signal; | |
6017 | CORE_ADDR stop_pc; | |
b89667eb DE |
6018 | struct regcache *registers; |
6019 | }; | |
6020 | ||
6021 | struct inferior_thread_state * | |
6022 | save_inferior_thread_state (void) | |
6023 | { | |
6024 | struct inferior_thread_state *inf_state = XMALLOC (struct inferior_thread_state); | |
6025 | struct thread_info *tp = inferior_thread (); | |
6026 | ||
6027 | inf_state->stop_signal = tp->stop_signal; | |
6028 | inf_state->stop_pc = stop_pc; | |
6029 | ||
6030 | inf_state->registers = regcache_dup (get_current_regcache ()); | |
6031 | ||
6032 | return inf_state; | |
6033 | } | |
6034 | ||
6035 | /* Restore inferior session state to INF_STATE. */ | |
6036 | ||
6037 | void | |
6038 | restore_inferior_thread_state (struct inferior_thread_state *inf_state) | |
6039 | { | |
6040 | struct thread_info *tp = inferior_thread (); | |
6041 | ||
6042 | tp->stop_signal = inf_state->stop_signal; | |
6043 | stop_pc = inf_state->stop_pc; | |
6044 | ||
6045 | /* The inferior can be gone if the user types "print exit(0)" | |
6046 | (and perhaps other times). */ | |
6047 | if (target_has_execution) | |
6048 | /* NB: The register write goes through to the target. */ | |
6049 | regcache_cpy (get_current_regcache (), inf_state->registers); | |
6050 | regcache_xfree (inf_state->registers); | |
6051 | xfree (inf_state); | |
6052 | } | |
6053 | ||
6054 | static void | |
6055 | do_restore_inferior_thread_state_cleanup (void *state) | |
6056 | { | |
6057 | restore_inferior_thread_state (state); | |
6058 | } | |
6059 | ||
6060 | struct cleanup * | |
6061 | make_cleanup_restore_inferior_thread_state (struct inferior_thread_state *inf_state) | |
6062 | { | |
6063 | return make_cleanup (do_restore_inferior_thread_state_cleanup, inf_state); | |
6064 | } | |
6065 | ||
6066 | void | |
6067 | discard_inferior_thread_state (struct inferior_thread_state *inf_state) | |
6068 | { | |
6069 | regcache_xfree (inf_state->registers); | |
6070 | xfree (inf_state); | |
6071 | } | |
6072 | ||
6073 | struct regcache * | |
6074 | get_inferior_thread_state_regcache (struct inferior_thread_state *inf_state) | |
6075 | { | |
6076 | return inf_state->registers; | |
6077 | } | |
6078 | ||
6079 | /* Session related state for inferior function calls. | |
6080 | These are the additional bits of state that need to be restored | |
6081 | when an inferior function call successfully completes. */ | |
6082 | ||
6083 | struct inferior_status | |
6084 | { | |
7a292a7a SS |
6085 | bpstat stop_bpstat; |
6086 | int stop_step; | |
aa7d318d | 6087 | enum stop_stack_kind stop_stack_dummy; |
7a292a7a | 6088 | int stopped_by_random_signal; |
ca67fcb8 | 6089 | int stepping_over_breakpoint; |
7a292a7a SS |
6090 | CORE_ADDR step_range_start; |
6091 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 6092 | struct frame_id step_frame_id; |
edb3359d | 6093 | struct frame_id step_stack_frame_id; |
5fbbeb29 | 6094 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
6095 | CORE_ADDR step_resume_break_address; |
6096 | int stop_after_trap; | |
c0236d92 | 6097 | int stop_soon; |
7a292a7a | 6098 | |
b89667eb | 6099 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe AC |
6100 | struct frame_id selected_frame_id; |
6101 | ||
7a292a7a | 6102 | int proceed_to_finish; |
c5a4d20b | 6103 | int in_infcall; |
7a292a7a SS |
6104 | }; |
6105 | ||
c906108c | 6106 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 6107 | connection. */ |
c906108c | 6108 | |
7a292a7a | 6109 | struct inferior_status * |
b89667eb | 6110 | save_inferior_status (void) |
c906108c | 6111 | { |
72cec141 | 6112 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
4e1c45ea | 6113 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 6114 | struct inferior *inf = current_inferior (); |
7a292a7a | 6115 | |
414c69f7 | 6116 | inf_status->stop_step = tp->stop_step; |
c906108c SS |
6117 | inf_status->stop_stack_dummy = stop_stack_dummy; |
6118 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
4e1c45ea PA |
6119 | inf_status->stepping_over_breakpoint = tp->trap_expected; |
6120 | inf_status->step_range_start = tp->step_range_start; | |
6121 | inf_status->step_range_end = tp->step_range_end; | |
6122 | inf_status->step_frame_id = tp->step_frame_id; | |
edb3359d | 6123 | inf_status->step_stack_frame_id = tp->step_stack_frame_id; |
078130d0 | 6124 | inf_status->step_over_calls = tp->step_over_calls; |
c906108c | 6125 | inf_status->stop_after_trap = stop_after_trap; |
d6b48e9c | 6126 | inf_status->stop_soon = inf->stop_soon; |
c906108c SS |
6127 | /* Save original bpstat chain here; replace it with copy of chain. |
6128 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
6129 | hand them back the original chain when restore_inferior_status is |
6130 | called. */ | |
347bddb7 PA |
6131 | inf_status->stop_bpstat = tp->stop_bpstat; |
6132 | tp->stop_bpstat = bpstat_copy (tp->stop_bpstat); | |
32400beb | 6133 | inf_status->proceed_to_finish = tp->proceed_to_finish; |
c5a4d20b | 6134 | inf_status->in_infcall = tp->in_infcall; |
c5aa993b | 6135 | |
206415a3 | 6136 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 6137 | |
7a292a7a | 6138 | return inf_status; |
c906108c SS |
6139 | } |
6140 | ||
c906108c | 6141 | static int |
96baa820 | 6142 | restore_selected_frame (void *args) |
c906108c | 6143 | { |
488f131b | 6144 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 6145 | struct frame_info *frame; |
c906108c | 6146 | |
101dcfbe | 6147 | frame = frame_find_by_id (*fid); |
c906108c | 6148 | |
aa0cd9c1 AC |
6149 | /* If inf_status->selected_frame_id is NULL, there was no previously |
6150 | selected frame. */ | |
101dcfbe | 6151 | if (frame == NULL) |
c906108c | 6152 | { |
8a3fe4f8 | 6153 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
6154 | return 0; |
6155 | } | |
6156 | ||
0f7d239c | 6157 | select_frame (frame); |
c906108c SS |
6158 | |
6159 | return (1); | |
6160 | } | |
6161 | ||
b89667eb DE |
6162 | /* Restore inferior session state to INF_STATUS. */ |
6163 | ||
c906108c | 6164 | void |
96baa820 | 6165 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c | 6166 | { |
4e1c45ea | 6167 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 6168 | struct inferior *inf = current_inferior (); |
4e1c45ea | 6169 | |
414c69f7 | 6170 | tp->stop_step = inf_status->stop_step; |
c906108c SS |
6171 | stop_stack_dummy = inf_status->stop_stack_dummy; |
6172 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
4e1c45ea PA |
6173 | tp->trap_expected = inf_status->stepping_over_breakpoint; |
6174 | tp->step_range_start = inf_status->step_range_start; | |
6175 | tp->step_range_end = inf_status->step_range_end; | |
6176 | tp->step_frame_id = inf_status->step_frame_id; | |
edb3359d | 6177 | tp->step_stack_frame_id = inf_status->step_stack_frame_id; |
078130d0 | 6178 | tp->step_over_calls = inf_status->step_over_calls; |
c906108c | 6179 | stop_after_trap = inf_status->stop_after_trap; |
d6b48e9c | 6180 | inf->stop_soon = inf_status->stop_soon; |
347bddb7 PA |
6181 | bpstat_clear (&tp->stop_bpstat); |
6182 | tp->stop_bpstat = inf_status->stop_bpstat; | |
b89667eb | 6183 | inf_status->stop_bpstat = NULL; |
32400beb | 6184 | tp->proceed_to_finish = inf_status->proceed_to_finish; |
c5a4d20b | 6185 | tp->in_infcall = inf_status->in_infcall; |
c906108c | 6186 | |
b89667eb | 6187 | if (target_has_stack) |
c906108c | 6188 | { |
c906108c | 6189 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
6190 | walking the stack might encounter a garbage pointer and |
6191 | error() trying to dereference it. */ | |
488f131b JB |
6192 | if (catch_errors |
6193 | (restore_selected_frame, &inf_status->selected_frame_id, | |
6194 | "Unable to restore previously selected frame:\n", | |
6195 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
6196 | /* Error in restoring the selected frame. Select the innermost |
6197 | frame. */ | |
0f7d239c | 6198 | select_frame (get_current_frame ()); |
c906108c | 6199 | } |
c906108c | 6200 | |
72cec141 | 6201 | xfree (inf_status); |
7a292a7a | 6202 | } |
c906108c | 6203 | |
74b7792f AC |
6204 | static void |
6205 | do_restore_inferior_status_cleanup (void *sts) | |
6206 | { | |
6207 | restore_inferior_status (sts); | |
6208 | } | |
6209 | ||
6210 | struct cleanup * | |
6211 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
6212 | { | |
6213 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
6214 | } | |
6215 | ||
c906108c | 6216 | void |
96baa820 | 6217 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
6218 | { |
6219 | /* See save_inferior_status for info on stop_bpstat. */ | |
6220 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 | 6221 | xfree (inf_status); |
7a292a7a | 6222 | } |
b89667eb | 6223 | \f |
47932f85 | 6224 | int |
3a3e9ee3 | 6225 | inferior_has_forked (ptid_t pid, ptid_t *child_pid) |
47932f85 DJ |
6226 | { |
6227 | struct target_waitstatus last; | |
6228 | ptid_t last_ptid; | |
6229 | ||
6230 | get_last_target_status (&last_ptid, &last); | |
6231 | ||
6232 | if (last.kind != TARGET_WAITKIND_FORKED) | |
6233 | return 0; | |
6234 | ||
3a3e9ee3 | 6235 | if (!ptid_equal (last_ptid, pid)) |
47932f85 DJ |
6236 | return 0; |
6237 | ||
6238 | *child_pid = last.value.related_pid; | |
6239 | return 1; | |
6240 | } | |
6241 | ||
6242 | int | |
3a3e9ee3 | 6243 | inferior_has_vforked (ptid_t pid, ptid_t *child_pid) |
47932f85 DJ |
6244 | { |
6245 | struct target_waitstatus last; | |
6246 | ptid_t last_ptid; | |
6247 | ||
6248 | get_last_target_status (&last_ptid, &last); | |
6249 | ||
6250 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
6251 | return 0; | |
6252 | ||
3a3e9ee3 | 6253 | if (!ptid_equal (last_ptid, pid)) |
47932f85 DJ |
6254 | return 0; |
6255 | ||
6256 | *child_pid = last.value.related_pid; | |
6257 | return 1; | |
6258 | } | |
6259 | ||
6260 | int | |
3a3e9ee3 | 6261 | inferior_has_execd (ptid_t pid, char **execd_pathname) |
47932f85 DJ |
6262 | { |
6263 | struct target_waitstatus last; | |
6264 | ptid_t last_ptid; | |
6265 | ||
6266 | get_last_target_status (&last_ptid, &last); | |
6267 | ||
6268 | if (last.kind != TARGET_WAITKIND_EXECD) | |
6269 | return 0; | |
6270 | ||
3a3e9ee3 | 6271 | if (!ptid_equal (last_ptid, pid)) |
47932f85 DJ |
6272 | return 0; |
6273 | ||
6274 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
6275 | return 1; | |
6276 | } | |
6277 | ||
a96d9b2e SDJ |
6278 | int |
6279 | inferior_has_called_syscall (ptid_t pid, int *syscall_number) | |
6280 | { | |
6281 | struct target_waitstatus last; | |
6282 | ptid_t last_ptid; | |
6283 | ||
6284 | get_last_target_status (&last_ptid, &last); | |
6285 | ||
6286 | if (last.kind != TARGET_WAITKIND_SYSCALL_ENTRY && | |
6287 | last.kind != TARGET_WAITKIND_SYSCALL_RETURN) | |
6288 | return 0; | |
6289 | ||
6290 | if (!ptid_equal (last_ptid, pid)) | |
6291 | return 0; | |
6292 | ||
6293 | *syscall_number = last.value.syscall_number; | |
6294 | return 1; | |
6295 | } | |
6296 | ||
ca6724c1 KB |
6297 | /* Oft used ptids */ |
6298 | ptid_t null_ptid; | |
6299 | ptid_t minus_one_ptid; | |
6300 | ||
6301 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 6302 | |
ca6724c1 KB |
6303 | ptid_t |
6304 | ptid_build (int pid, long lwp, long tid) | |
6305 | { | |
6306 | ptid_t ptid; | |
6307 | ||
6308 | ptid.pid = pid; | |
6309 | ptid.lwp = lwp; | |
6310 | ptid.tid = tid; | |
6311 | return ptid; | |
6312 | } | |
6313 | ||
6314 | /* Create a ptid from just a pid. */ | |
6315 | ||
6316 | ptid_t | |
6317 | pid_to_ptid (int pid) | |
6318 | { | |
6319 | return ptid_build (pid, 0, 0); | |
6320 | } | |
6321 | ||
6322 | /* Fetch the pid (process id) component from a ptid. */ | |
6323 | ||
6324 | int | |
6325 | ptid_get_pid (ptid_t ptid) | |
6326 | { | |
6327 | return ptid.pid; | |
6328 | } | |
6329 | ||
6330 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
6331 | ||
6332 | long | |
6333 | ptid_get_lwp (ptid_t ptid) | |
6334 | { | |
6335 | return ptid.lwp; | |
6336 | } | |
6337 | ||
6338 | /* Fetch the tid (thread id) component from a ptid. */ | |
6339 | ||
6340 | long | |
6341 | ptid_get_tid (ptid_t ptid) | |
6342 | { | |
6343 | return ptid.tid; | |
6344 | } | |
6345 | ||
6346 | /* ptid_equal() is used to test equality of two ptids. */ | |
6347 | ||
6348 | int | |
6349 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
6350 | { | |
6351 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 6352 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
6353 | } |
6354 | ||
252fbfc8 PA |
6355 | /* Returns true if PTID represents a process. */ |
6356 | ||
6357 | int | |
6358 | ptid_is_pid (ptid_t ptid) | |
6359 | { | |
6360 | if (ptid_equal (minus_one_ptid, ptid)) | |
6361 | return 0; | |
6362 | if (ptid_equal (null_ptid, ptid)) | |
6363 | return 0; | |
6364 | ||
6365 | return (ptid_get_lwp (ptid) == 0 && ptid_get_tid (ptid) == 0); | |
6366 | } | |
6367 | ||
0723dbf5 PA |
6368 | int |
6369 | ptid_match (ptid_t ptid, ptid_t filter) | |
6370 | { | |
6371 | /* Since both parameters have the same type, prevent easy mistakes | |
6372 | from happening. */ | |
6373 | gdb_assert (!ptid_equal (ptid, minus_one_ptid) | |
5f25d77d | 6374 | && !ptid_equal (ptid, null_ptid)); |
0723dbf5 PA |
6375 | |
6376 | if (ptid_equal (filter, minus_one_ptid)) | |
6377 | return 1; | |
6378 | if (ptid_is_pid (filter) | |
6379 | && ptid_get_pid (ptid) == ptid_get_pid (filter)) | |
6380 | return 1; | |
6381 | else if (ptid_equal (ptid, filter)) | |
6382 | return 1; | |
6383 | ||
6384 | return 0; | |
6385 | } | |
6386 | ||
ca6724c1 KB |
6387 | /* restore_inferior_ptid() will be used by the cleanup machinery |
6388 | to restore the inferior_ptid value saved in a call to | |
6389 | save_inferior_ptid(). */ | |
ce696e05 KB |
6390 | |
6391 | static void | |
6392 | restore_inferior_ptid (void *arg) | |
6393 | { | |
6394 | ptid_t *saved_ptid_ptr = arg; | |
abbb1732 | 6395 | |
ce696e05 KB |
6396 | inferior_ptid = *saved_ptid_ptr; |
6397 | xfree (arg); | |
6398 | } | |
6399 | ||
6400 | /* Save the value of inferior_ptid so that it may be restored by a | |
6401 | later call to do_cleanups(). Returns the struct cleanup pointer | |
6402 | needed for later doing the cleanup. */ | |
6403 | ||
6404 | struct cleanup * | |
6405 | save_inferior_ptid (void) | |
6406 | { | |
6407 | ptid_t *saved_ptid_ptr; | |
6408 | ||
6409 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
6410 | *saved_ptid_ptr = inferior_ptid; | |
6411 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
6412 | } | |
c5aa993b | 6413 | \f |
488f131b | 6414 | |
b2175913 MS |
6415 | /* User interface for reverse debugging: |
6416 | Set exec-direction / show exec-direction commands | |
6417 | (returns error unless target implements to_set_exec_direction method). */ | |
6418 | ||
6419 | enum exec_direction_kind execution_direction = EXEC_FORWARD; | |
6420 | static const char exec_forward[] = "forward"; | |
6421 | static const char exec_reverse[] = "reverse"; | |
6422 | static const char *exec_direction = exec_forward; | |
6423 | static const char *exec_direction_names[] = { | |
6424 | exec_forward, | |
6425 | exec_reverse, | |
6426 | NULL | |
6427 | }; | |
6428 | ||
6429 | static void | |
6430 | set_exec_direction_func (char *args, int from_tty, | |
6431 | struct cmd_list_element *cmd) | |
6432 | { | |
6433 | if (target_can_execute_reverse) | |
6434 | { | |
6435 | if (!strcmp (exec_direction, exec_forward)) | |
6436 | execution_direction = EXEC_FORWARD; | |
6437 | else if (!strcmp (exec_direction, exec_reverse)) | |
6438 | execution_direction = EXEC_REVERSE; | |
6439 | } | |
6440 | } | |
6441 | ||
6442 | static void | |
6443 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
6444 | struct cmd_list_element *cmd, const char *value) | |
6445 | { | |
6446 | switch (execution_direction) { | |
6447 | case EXEC_FORWARD: | |
6448 | fprintf_filtered (out, _("Forward.\n")); | |
6449 | break; | |
6450 | case EXEC_REVERSE: | |
6451 | fprintf_filtered (out, _("Reverse.\n")); | |
6452 | break; | |
6453 | case EXEC_ERROR: | |
6454 | default: | |
6455 | fprintf_filtered (out, | |
6456 | _("Forward (target `%s' does not support exec-direction).\n"), | |
6457 | target_shortname); | |
6458 | break; | |
6459 | } | |
6460 | } | |
6461 | ||
6462 | /* User interface for non-stop mode. */ | |
6463 | ||
ad52ddc6 | 6464 | int non_stop = 0; |
ad52ddc6 PA |
6465 | |
6466 | static void | |
6467 | set_non_stop (char *args, int from_tty, | |
6468 | struct cmd_list_element *c) | |
6469 | { | |
6470 | if (target_has_execution) | |
6471 | { | |
6472 | non_stop_1 = non_stop; | |
6473 | error (_("Cannot change this setting while the inferior is running.")); | |
6474 | } | |
6475 | ||
6476 | non_stop = non_stop_1; | |
6477 | } | |
6478 | ||
6479 | static void | |
6480 | show_non_stop (struct ui_file *file, int from_tty, | |
6481 | struct cmd_list_element *c, const char *value) | |
6482 | { | |
6483 | fprintf_filtered (file, | |
6484 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
6485 | value); | |
6486 | } | |
6487 | ||
d4db2f36 PA |
6488 | static void |
6489 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
6490 | struct cmd_list_element *c, const char *value) | |
6491 | { | |
6492 | fprintf_filtered (file, _("\ | |
6493 | Resuming the execution of threads of all processes is %s.\n"), value); | |
6494 | } | |
ad52ddc6 | 6495 | |
c906108c | 6496 | void |
96baa820 | 6497 | _initialize_infrun (void) |
c906108c | 6498 | { |
52f0bd74 AC |
6499 | int i; |
6500 | int numsigs; | |
c906108c | 6501 | |
1bedd215 AC |
6502 | add_info ("signals", signals_info, _("\ |
6503 | What debugger does when program gets various signals.\n\ | |
6504 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
6505 | add_info_alias ("handle", "signals", 0); |
6506 | ||
1bedd215 AC |
6507 | add_com ("handle", class_run, handle_command, _("\ |
6508 | Specify how to handle a signal.\n\ | |
c906108c SS |
6509 | Args are signals and actions to apply to those signals.\n\ |
6510 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
6511 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
6512 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
6513 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
6514 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
6515 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
c906108c SS |
6516 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
6517 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
6518 | Print means print a message if this signal happens.\n\ | |
6519 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
6520 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 6521 | Pass and Stop may be combined.")); |
c906108c SS |
6522 | if (xdb_commands) |
6523 | { | |
1bedd215 AC |
6524 | add_com ("lz", class_info, signals_info, _("\ |
6525 | What debugger does when program gets various signals.\n\ | |
6526 | Specify a signal as argument to print info on that signal only.")); | |
6527 | add_com ("z", class_run, xdb_handle_command, _("\ | |
6528 | Specify how to handle a signal.\n\ | |
c906108c SS |
6529 | Args are signals and actions to apply to those signals.\n\ |
6530 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
6531 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
6532 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
6533 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 6534 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
cce7e648 | 6535 | Recognized actions include \"s\" (toggles between stop and nostop),\n\ |
c906108c SS |
6536 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
6537 | nopass), \"Q\" (noprint)\n\ | |
6538 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
6539 | Print means print a message if this signal happens.\n\ | |
6540 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
6541 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 6542 | Pass and Stop may be combined.")); |
c906108c SS |
6543 | } |
6544 | ||
6545 | if (!dbx_commands) | |
1a966eab AC |
6546 | stop_command = add_cmd ("stop", class_obscure, |
6547 | not_just_help_class_command, _("\ | |
6548 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 6549 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 6550 | of the program stops."), &cmdlist); |
c906108c | 6551 | |
85c07804 AC |
6552 | add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
6553 | Set inferior debugging."), _("\ | |
6554 | Show inferior debugging."), _("\ | |
6555 | When non-zero, inferior specific debugging is enabled."), | |
6556 | NULL, | |
920d2a44 | 6557 | show_debug_infrun, |
85c07804 | 6558 | &setdebuglist, &showdebuglist); |
527159b7 | 6559 | |
237fc4c9 PA |
6560 | add_setshow_boolean_cmd ("displaced", class_maintenance, &debug_displaced, _("\ |
6561 | Set displaced stepping debugging."), _("\ | |
6562 | Show displaced stepping debugging."), _("\ | |
6563 | When non-zero, displaced stepping specific debugging is enabled."), | |
6564 | NULL, | |
6565 | show_debug_displaced, | |
6566 | &setdebuglist, &showdebuglist); | |
6567 | ||
ad52ddc6 PA |
6568 | add_setshow_boolean_cmd ("non-stop", no_class, |
6569 | &non_stop_1, _("\ | |
6570 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
6571 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
6572 | When debugging a multi-threaded program and this setting is\n\ | |
6573 | off (the default, also called all-stop mode), when one thread stops\n\ | |
6574 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
6575 | all other threads in the program while you interact with the thread of\n\ | |
6576 | interest. When you continue or step a thread, you can allow the other\n\ | |
6577 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
6578 | thread's state, all threads stop.\n\ | |
6579 | \n\ | |
6580 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
6581 | to run freely. You'll be able to step each thread independently,\n\ | |
6582 | leave it stopped or free to run as needed."), | |
6583 | set_non_stop, | |
6584 | show_non_stop, | |
6585 | &setlist, | |
6586 | &showlist); | |
6587 | ||
c906108c | 6588 | numsigs = (int) TARGET_SIGNAL_LAST; |
488f131b | 6589 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
6590 | signal_print = (unsigned char *) |
6591 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
6592 | signal_program = (unsigned char *) | |
6593 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
6594 | for (i = 0; i < numsigs; i++) | |
6595 | { | |
6596 | signal_stop[i] = 1; | |
6597 | signal_print[i] = 1; | |
6598 | signal_program[i] = 1; | |
6599 | } | |
6600 | ||
6601 | /* Signals caused by debugger's own actions | |
6602 | should not be given to the program afterwards. */ | |
6603 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
6604 | signal_program[TARGET_SIGNAL_INT] = 0; | |
6605 | ||
6606 | /* Signals that are not errors should not normally enter the debugger. */ | |
6607 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
6608 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
6609 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
6610 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
6611 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
6612 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
6613 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
6614 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
6615 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
6616 | signal_print[TARGET_SIGNAL_IO] = 0; | |
6617 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
6618 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
6619 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
6620 | signal_print[TARGET_SIGNAL_URG] = 0; | |
6621 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
6622 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
6623 | ||
cd0fc7c3 SS |
6624 | /* These signals are used internally by user-level thread |
6625 | implementations. (See signal(5) on Solaris.) Like the above | |
6626 | signals, a healthy program receives and handles them as part of | |
6627 | its normal operation. */ | |
6628 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
6629 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
6630 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
6631 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
6632 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
6633 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
6634 | ||
85c07804 AC |
6635 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
6636 | &stop_on_solib_events, _("\ | |
6637 | Set stopping for shared library events."), _("\ | |
6638 | Show stopping for shared library events."), _("\ | |
c906108c SS |
6639 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
6640 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 AC |
6641 | to the user would be loading/unloading of a new library."), |
6642 | NULL, | |
920d2a44 | 6643 | show_stop_on_solib_events, |
85c07804 | 6644 | &setlist, &showlist); |
c906108c | 6645 | |
7ab04401 AC |
6646 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
6647 | follow_fork_mode_kind_names, | |
6648 | &follow_fork_mode_string, _("\ | |
6649 | Set debugger response to a program call of fork or vfork."), _("\ | |
6650 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
6651 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
6652 | parent - the original process is debugged after a fork\n\ | |
6653 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 6654 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
6655 | By default, the debugger will follow the parent process."), |
6656 | NULL, | |
920d2a44 | 6657 | show_follow_fork_mode_string, |
7ab04401 AC |
6658 | &setlist, &showlist); |
6659 | ||
6c95b8df PA |
6660 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
6661 | follow_exec_mode_names, | |
6662 | &follow_exec_mode_string, _("\ | |
6663 | Set debugger response to a program call of exec."), _("\ | |
6664 | Show debugger response to a program call of exec."), _("\ | |
6665 | An exec call replaces the program image of a process.\n\ | |
6666 | \n\ | |
6667 | follow-exec-mode can be:\n\ | |
6668 | \n\ | |
cce7e648 | 6669 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
6670 | to this new inferior. The program the process was running before\n\ |
6671 | the exec call can be restarted afterwards by restarting the original\n\ | |
6672 | inferior.\n\ | |
6673 | \n\ | |
6674 | same - the debugger keeps the process bound to the same inferior.\n\ | |
6675 | The new executable image replaces the previous executable loaded in\n\ | |
6676 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
6677 | the executable the process was running after the exec call.\n\ | |
6678 | \n\ | |
6679 | By default, the debugger will use the same inferior."), | |
6680 | NULL, | |
6681 | show_follow_exec_mode_string, | |
6682 | &setlist, &showlist); | |
6683 | ||
7ab04401 AC |
6684 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
6685 | scheduler_enums, &scheduler_mode, _("\ | |
6686 | Set mode for locking scheduler during execution."), _("\ | |
6687 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
6688 | off == no locking (threads may preempt at any time)\n\ |
6689 | on == full locking (no thread except the current thread may run)\n\ | |
6690 | step == scheduler locked during every single-step operation.\n\ | |
6691 | In this mode, no other thread may run during a step command.\n\ | |
7ab04401 AC |
6692 | Other threads may run while stepping over a function call ('next')."), |
6693 | set_schedlock_func, /* traps on target vector */ | |
920d2a44 | 6694 | show_scheduler_mode, |
7ab04401 | 6695 | &setlist, &showlist); |
5fbbeb29 | 6696 | |
d4db2f36 PA |
6697 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
6698 | Set mode for resuming threads of all processes."), _("\ | |
6699 | Show mode for resuming threads of all processes."), _("\ | |
6700 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
6701 | threads of all processes. When off (which is the default), execution\n\ | |
6702 | commands only resume the threads of the current process. The set of\n\ | |
6703 | threads that are resumed is further refined by the scheduler-locking\n\ | |
6704 | mode (see help set scheduler-locking)."), | |
6705 | NULL, | |
6706 | show_schedule_multiple, | |
6707 | &setlist, &showlist); | |
6708 | ||
5bf193a2 AC |
6709 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
6710 | Set mode of the step operation."), _("\ | |
6711 | Show mode of the step operation."), _("\ | |
6712 | When set, doing a step over a function without debug line information\n\ | |
6713 | will stop at the first instruction of that function. Otherwise, the\n\ | |
6714 | function is skipped and the step command stops at a different source line."), | |
6715 | NULL, | |
920d2a44 | 6716 | show_step_stop_if_no_debug, |
5bf193a2 | 6717 | &setlist, &showlist); |
ca6724c1 | 6718 | |
fff08868 HZ |
6719 | add_setshow_enum_cmd ("displaced-stepping", class_run, |
6720 | can_use_displaced_stepping_enum, | |
6721 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
6722 | Set debugger's willingness to use displaced stepping."), _("\ |
6723 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
6724 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
6725 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
6726 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
6727 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
6728 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
6729 | use it in all-stop mode (see help set non-stop)."), | |
6730 | NULL, | |
6731 | show_can_use_displaced_stepping, | |
6732 | &setlist, &showlist); | |
237fc4c9 | 6733 | |
b2175913 MS |
6734 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
6735 | &exec_direction, _("Set direction of execution.\n\ | |
6736 | Options are 'forward' or 'reverse'."), | |
6737 | _("Show direction of execution (forward/reverse)."), | |
6738 | _("Tells gdb whether to execute forward or backward."), | |
6739 | set_exec_direction_func, show_exec_direction_func, | |
6740 | &setlist, &showlist); | |
6741 | ||
6c95b8df PA |
6742 | /* Set/show detach-on-fork: user-settable mode. */ |
6743 | ||
6744 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
6745 | Set whether gdb will detach the child of a fork."), _("\ | |
6746 | Show whether gdb will detach the child of a fork."), _("\ | |
6747 | Tells gdb whether to detach the child of a fork."), | |
6748 | NULL, NULL, &setlist, &showlist); | |
6749 | ||
ca6724c1 KB |
6750 | /* ptid initializations */ |
6751 | null_ptid = ptid_build (0, 0, 0); | |
6752 | minus_one_ptid = ptid_build (-1, 0, 0); | |
6753 | inferior_ptid = null_ptid; | |
6754 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd PA |
6755 | |
6756 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 6757 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 6758 | observer_attach_thread_exit (infrun_thread_thread_exit); |
fc1cf338 | 6759 | observer_attach_inferior_exit (infrun_inferior_exit); |
4aa995e1 PA |
6760 | |
6761 | /* Explicitly create without lookup, since that tries to create a | |
6762 | value with a void typed value, and when we get here, gdbarch | |
6763 | isn't initialized yet. At this point, we're quite sure there | |
6764 | isn't another convenience variable of the same name. */ | |
6765 | create_internalvar_type_lazy ("_siginfo", siginfo_make_value); | |
d914c394 SS |
6766 | |
6767 | add_setshow_boolean_cmd ("observer", no_class, | |
6768 | &observer_mode_1, _("\ | |
6769 | Set whether gdb controls the inferior in observer mode."), _("\ | |
6770 | Show whether gdb controls the inferior in observer mode."), _("\ | |
6771 | In observer mode, GDB can get data from the inferior, but not\n\ | |
6772 | affect its execution. Registers and memory may not be changed,\n\ | |
6773 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
6774 | or signalled."), | |
6775 | set_observer_mode, | |
6776 | show_observer_mode, | |
6777 | &setlist, | |
6778 | &showlist); | |
c906108c | 6779 | } |