Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
0b302171 | 4 | Copyright (C) 1986-2012 Free Software Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 11 | (at your option) any later version. |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "gdb_string.h" | |
23 | #include <ctype.h> | |
24 | #include "symtab.h" | |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
60250e8b | 27 | #include "exceptions.h" |
c906108c | 28 | #include "breakpoint.h" |
03f2053f | 29 | #include "gdb_wait.h" |
c906108c SS |
30 | #include "gdbcore.h" |
31 | #include "gdbcmd.h" | |
210661e7 | 32 | #include "cli/cli-script.h" |
c906108c SS |
33 | #include "target.h" |
34 | #include "gdbthread.h" | |
35 | #include "annotate.h" | |
1adeb98a | 36 | #include "symfile.h" |
7a292a7a | 37 | #include "top.h" |
c906108c | 38 | #include <signal.h> |
2acceee2 | 39 | #include "inf-loop.h" |
4e052eda | 40 | #include "regcache.h" |
fd0407d6 | 41 | #include "value.h" |
06600e06 | 42 | #include "observer.h" |
f636b87d | 43 | #include "language.h" |
a77053c2 | 44 | #include "solib.h" |
f17517ea | 45 | #include "main.h" |
186c406b TT |
46 | #include "dictionary.h" |
47 | #include "block.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" |
be34f849 | 55 | #include "continuations.h" |
b4a14fd0 | 56 | #include "interps.h" |
1bfeeb0f | 57 | #include "skip.h" |
c906108c SS |
58 | |
59 | /* Prototypes for local functions */ | |
60 | ||
96baa820 | 61 | static void signals_info (char *, int); |
c906108c | 62 | |
96baa820 | 63 | static void handle_command (char *, int); |
c906108c | 64 | |
96baa820 | 65 | static void sig_print_info (enum target_signal); |
c906108c | 66 | |
96baa820 | 67 | static void sig_print_header (void); |
c906108c | 68 | |
74b7792f | 69 | static void resume_cleanups (void *); |
c906108c | 70 | |
96baa820 | 71 | static int hook_stop_stub (void *); |
c906108c | 72 | |
96baa820 JM |
73 | static int restore_selected_frame (void *); |
74 | ||
4ef3f3be | 75 | static int follow_fork (void); |
96baa820 JM |
76 | |
77 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 78 | struct cmd_list_element *c); |
96baa820 | 79 | |
a289b8f6 JK |
80 | static int currently_stepping (struct thread_info *tp); |
81 | ||
b3444185 PA |
82 | static int currently_stepping_or_nexting_callback (struct thread_info *tp, |
83 | void *data); | |
a7212384 | 84 | |
96baa820 JM |
85 | static void xdb_handle_command (char *args, int from_tty); |
86 | ||
6a6b96b9 | 87 | static int prepare_to_proceed (int); |
ea67f13b | 88 | |
33d62d64 JK |
89 | static void print_exited_reason (int exitstatus); |
90 | ||
91 | static void print_signal_exited_reason (enum target_signal siggnal); | |
92 | ||
93 | static void print_no_history_reason (void); | |
94 | ||
95 | static void print_signal_received_reason (enum target_signal siggnal); | |
96 | ||
97 | static void print_end_stepping_range_reason (void); | |
98 | ||
96baa820 | 99 | void _initialize_infrun (void); |
43ff13b4 | 100 | |
e58b0e63 PA |
101 | void nullify_last_target_wait_ptid (void); |
102 | ||
2c03e5be | 103 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
104 | |
105 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
106 | ||
2484c66b UW |
107 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
108 | ||
5fbbeb29 CF |
109 | /* When set, stop the 'step' command if we enter a function which has |
110 | no line number information. The normal behavior is that we step | |
111 | over such function. */ | |
112 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
113 | static void |
114 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
115 | struct cmd_list_element *c, const char *value) | |
116 | { | |
117 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
118 | } | |
5fbbeb29 | 119 | |
1777feb0 | 120 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 121 | |
43ff13b4 JM |
122 | int sync_execution = 0; |
123 | ||
c906108c SS |
124 | /* wait_for_inferior and normal_stop use this to notify the user |
125 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
126 | running in. */ |
127 | ||
39f77062 | 128 | static ptid_t previous_inferior_ptid; |
7a292a7a | 129 | |
6c95b8df PA |
130 | /* Default behavior is to detach newly forked processes (legacy). */ |
131 | int detach_fork = 1; | |
132 | ||
237fc4c9 PA |
133 | int debug_displaced = 0; |
134 | static void | |
135 | show_debug_displaced (struct ui_file *file, int from_tty, | |
136 | struct cmd_list_element *c, const char *value) | |
137 | { | |
138 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
139 | } | |
140 | ||
628fe4e4 | 141 | int debug_infrun = 0; |
920d2a44 AC |
142 | static void |
143 | show_debug_infrun (struct ui_file *file, int from_tty, | |
144 | struct cmd_list_element *c, const char *value) | |
145 | { | |
146 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
147 | } | |
527159b7 | 148 | |
03583c20 UW |
149 | |
150 | /* Support for disabling address space randomization. */ | |
151 | ||
152 | int disable_randomization = 1; | |
153 | ||
154 | static void | |
155 | show_disable_randomization (struct ui_file *file, int from_tty, | |
156 | struct cmd_list_element *c, const char *value) | |
157 | { | |
158 | if (target_supports_disable_randomization ()) | |
159 | fprintf_filtered (file, | |
160 | _("Disabling randomization of debuggee's " | |
161 | "virtual address space is %s.\n"), | |
162 | value); | |
163 | else | |
164 | fputs_filtered (_("Disabling randomization of debuggee's " | |
165 | "virtual address space is unsupported on\n" | |
166 | "this platform.\n"), file); | |
167 | } | |
168 | ||
169 | static void | |
170 | set_disable_randomization (char *args, int from_tty, | |
171 | struct cmd_list_element *c) | |
172 | { | |
173 | if (!target_supports_disable_randomization ()) | |
174 | error (_("Disabling randomization of debuggee's " | |
175 | "virtual address space is unsupported on\n" | |
176 | "this platform.")); | |
177 | } | |
178 | ||
179 | ||
d4f3574e SS |
180 | /* If the program uses ELF-style shared libraries, then calls to |
181 | functions in shared libraries go through stubs, which live in a | |
182 | table called the PLT (Procedure Linkage Table). The first time the | |
183 | function is called, the stub sends control to the dynamic linker, | |
184 | which looks up the function's real address, patches the stub so | |
185 | that future calls will go directly to the function, and then passes | |
186 | control to the function. | |
187 | ||
188 | If we are stepping at the source level, we don't want to see any of | |
189 | this --- we just want to skip over the stub and the dynamic linker. | |
190 | The simple approach is to single-step until control leaves the | |
191 | dynamic linker. | |
192 | ||
ca557f44 AC |
193 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
194 | dynamic linker calls functions in the shared C library, so you | |
195 | can't tell from the PC alone whether the dynamic linker is still | |
196 | running. In this case, we use a step-resume breakpoint to get us | |
197 | past the dynamic linker, as if we were using "next" to step over a | |
198 | function call. | |
d4f3574e | 199 | |
cfd8ab24 | 200 | in_solib_dynsym_resolve_code() says whether we're in the dynamic |
d4f3574e SS |
201 | linker code or not. Normally, this means we single-step. However, |
202 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
203 | address where we can place a step-resume breakpoint to get past the | |
204 | linker's symbol resolution function. | |
205 | ||
cfd8ab24 | 206 | in_solib_dynsym_resolve_code() can generally be implemented in a |
d4f3574e SS |
207 | pretty portable way, by comparing the PC against the address ranges |
208 | of the dynamic linker's sections. | |
209 | ||
210 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
211 | it depends on internal details of the dynamic linker. It's usually | |
212 | not too hard to figure out where to put a breakpoint, but it | |
213 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
214 | sanity checking. If it can't figure things out, returning zero and | |
215 | getting the (possibly confusing) stepping behavior is better than | |
216 | signalling an error, which will obscure the change in the | |
217 | inferior's state. */ | |
c906108c | 218 | |
c906108c SS |
219 | /* This function returns TRUE if pc is the address of an instruction |
220 | that lies within the dynamic linker (such as the event hook, or the | |
221 | dld itself). | |
222 | ||
223 | This function must be used only when a dynamic linker event has | |
224 | been caught, and the inferior is being stepped out of the hook, or | |
225 | undefined results are guaranteed. */ | |
226 | ||
227 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
228 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
229 | #endif | |
230 | ||
d914c394 SS |
231 | /* "Observer mode" is somewhat like a more extreme version of |
232 | non-stop, in which all GDB operations that might affect the | |
233 | target's execution have been disabled. */ | |
234 | ||
235 | static int non_stop_1 = 0; | |
236 | ||
237 | int observer_mode = 0; | |
238 | static int observer_mode_1 = 0; | |
239 | ||
240 | static void | |
241 | set_observer_mode (char *args, int from_tty, | |
242 | struct cmd_list_element *c) | |
243 | { | |
244 | extern int pagination_enabled; | |
245 | ||
246 | if (target_has_execution) | |
247 | { | |
248 | observer_mode_1 = observer_mode; | |
249 | error (_("Cannot change this setting while the inferior is running.")); | |
250 | } | |
251 | ||
252 | observer_mode = observer_mode_1; | |
253 | ||
254 | may_write_registers = !observer_mode; | |
255 | may_write_memory = !observer_mode; | |
256 | may_insert_breakpoints = !observer_mode; | |
257 | may_insert_tracepoints = !observer_mode; | |
258 | /* We can insert fast tracepoints in or out of observer mode, | |
259 | but enable them if we're going into this mode. */ | |
260 | if (observer_mode) | |
261 | may_insert_fast_tracepoints = 1; | |
262 | may_stop = !observer_mode; | |
263 | update_target_permissions (); | |
264 | ||
265 | /* Going *into* observer mode we must force non-stop, then | |
266 | going out we leave it that way. */ | |
267 | if (observer_mode) | |
268 | { | |
269 | target_async_permitted = 1; | |
270 | pagination_enabled = 0; | |
271 | non_stop = non_stop_1 = 1; | |
272 | } | |
273 | ||
274 | if (from_tty) | |
275 | printf_filtered (_("Observer mode is now %s.\n"), | |
276 | (observer_mode ? "on" : "off")); | |
277 | } | |
278 | ||
279 | static void | |
280 | show_observer_mode (struct ui_file *file, int from_tty, | |
281 | struct cmd_list_element *c, const char *value) | |
282 | { | |
283 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
284 | } | |
285 | ||
286 | /* This updates the value of observer mode based on changes in | |
287 | permissions. Note that we are deliberately ignoring the values of | |
288 | may-write-registers and may-write-memory, since the user may have | |
289 | reason to enable these during a session, for instance to turn on a | |
290 | debugging-related global. */ | |
291 | ||
292 | void | |
293 | update_observer_mode (void) | |
294 | { | |
295 | int newval; | |
296 | ||
297 | newval = (!may_insert_breakpoints | |
298 | && !may_insert_tracepoints | |
299 | && may_insert_fast_tracepoints | |
300 | && !may_stop | |
301 | && non_stop); | |
302 | ||
303 | /* Let the user know if things change. */ | |
304 | if (newval != observer_mode) | |
305 | printf_filtered (_("Observer mode is now %s.\n"), | |
306 | (newval ? "on" : "off")); | |
307 | ||
308 | observer_mode = observer_mode_1 = newval; | |
309 | } | |
c2c6d25f | 310 | |
c906108c SS |
311 | /* Tables of how to react to signals; the user sets them. */ |
312 | ||
313 | static unsigned char *signal_stop; | |
314 | static unsigned char *signal_print; | |
315 | static unsigned char *signal_program; | |
316 | ||
2455069d UW |
317 | /* Table of signals that the target may silently handle. |
318 | This is automatically determined from the flags above, | |
319 | and simply cached here. */ | |
320 | static unsigned char *signal_pass; | |
321 | ||
c906108c SS |
322 | #define SET_SIGS(nsigs,sigs,flags) \ |
323 | do { \ | |
324 | int signum = (nsigs); \ | |
325 | while (signum-- > 0) \ | |
326 | if ((sigs)[signum]) \ | |
327 | (flags)[signum] = 1; \ | |
328 | } while (0) | |
329 | ||
330 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
331 | do { \ | |
332 | int signum = (nsigs); \ | |
333 | while (signum-- > 0) \ | |
334 | if ((sigs)[signum]) \ | |
335 | (flags)[signum] = 0; \ | |
336 | } while (0) | |
337 | ||
1777feb0 | 338 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 339 | |
edb3359d | 340 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
341 | |
342 | /* Command list pointer for the "stop" placeholder. */ | |
343 | ||
344 | static struct cmd_list_element *stop_command; | |
345 | ||
c906108c SS |
346 | /* Function inferior was in as of last step command. */ |
347 | ||
348 | static struct symbol *step_start_function; | |
349 | ||
c906108c SS |
350 | /* Nonzero if we want to give control to the user when we're notified |
351 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 352 | int stop_on_solib_events; |
920d2a44 AC |
353 | static void |
354 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
355 | struct cmd_list_element *c, const char *value) | |
356 | { | |
357 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
358 | value); | |
359 | } | |
c906108c | 360 | |
c906108c SS |
361 | /* Nonzero means expecting a trace trap |
362 | and should stop the inferior and return silently when it happens. */ | |
363 | ||
364 | int stop_after_trap; | |
365 | ||
642fd101 DE |
366 | /* Save register contents here when executing a "finish" command or are |
367 | about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set. | |
c906108c SS |
368 | Thus this contains the return value from the called function (assuming |
369 | values are returned in a register). */ | |
370 | ||
72cec141 | 371 | struct regcache *stop_registers; |
c906108c | 372 | |
c906108c SS |
373 | /* Nonzero after stop if current stack frame should be printed. */ |
374 | ||
375 | static int stop_print_frame; | |
376 | ||
e02bc4cc | 377 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
378 | returned by target_wait()/deprecated_target_wait_hook(). This |
379 | information is returned by get_last_target_status(). */ | |
39f77062 | 380 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
381 | static struct target_waitstatus target_last_waitstatus; |
382 | ||
0d1e5fa7 PA |
383 | static void context_switch (ptid_t ptid); |
384 | ||
4e1c45ea | 385 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 PA |
386 | |
387 | void init_infwait_state (void); | |
a474d7c2 | 388 | |
53904c9e AC |
389 | static const char follow_fork_mode_child[] = "child"; |
390 | static const char follow_fork_mode_parent[] = "parent"; | |
391 | ||
40478521 | 392 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
393 | follow_fork_mode_child, |
394 | follow_fork_mode_parent, | |
395 | NULL | |
ef346e04 | 396 | }; |
c906108c | 397 | |
53904c9e | 398 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
399 | static void |
400 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
401 | struct cmd_list_element *c, const char *value) | |
402 | { | |
3e43a32a MS |
403 | fprintf_filtered (file, |
404 | _("Debugger response to a program " | |
405 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
406 | value); |
407 | } | |
c906108c SS |
408 | \f |
409 | ||
e58b0e63 PA |
410 | /* Tell the target to follow the fork we're stopped at. Returns true |
411 | if the inferior should be resumed; false, if the target for some | |
412 | reason decided it's best not to resume. */ | |
413 | ||
6604731b | 414 | static int |
4ef3f3be | 415 | follow_fork (void) |
c906108c | 416 | { |
ea1dd7bc | 417 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
418 | int should_resume = 1; |
419 | struct thread_info *tp; | |
420 | ||
421 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
422 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
423 | parent thread structure's run control related fields, not just these. |
424 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
425 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 426 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
427 | CORE_ADDR step_range_start = 0; |
428 | CORE_ADDR step_range_end = 0; | |
429 | struct frame_id step_frame_id = { 0 }; | |
e58b0e63 PA |
430 | |
431 | if (!non_stop) | |
432 | { | |
433 | ptid_t wait_ptid; | |
434 | struct target_waitstatus wait_status; | |
435 | ||
436 | /* Get the last target status returned by target_wait(). */ | |
437 | get_last_target_status (&wait_ptid, &wait_status); | |
438 | ||
439 | /* If not stopped at a fork event, then there's nothing else to | |
440 | do. */ | |
441 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
442 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
443 | return 1; | |
444 | ||
445 | /* Check if we switched over from WAIT_PTID, since the event was | |
446 | reported. */ | |
447 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
448 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
449 | { | |
450 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
451 | target to follow it (in either direction). We'll | |
452 | afterwards refuse to resume, and inform the user what | |
453 | happened. */ | |
454 | switch_to_thread (wait_ptid); | |
455 | should_resume = 0; | |
456 | } | |
457 | } | |
458 | ||
459 | tp = inferior_thread (); | |
460 | ||
461 | /* If there were any forks/vforks that were caught and are now to be | |
462 | followed, then do so now. */ | |
463 | switch (tp->pending_follow.kind) | |
464 | { | |
465 | case TARGET_WAITKIND_FORKED: | |
466 | case TARGET_WAITKIND_VFORKED: | |
467 | { | |
468 | ptid_t parent, child; | |
469 | ||
470 | /* If the user did a next/step, etc, over a fork call, | |
471 | preserve the stepping state in the fork child. */ | |
472 | if (follow_child && should_resume) | |
473 | { | |
8358c15c JK |
474 | step_resume_breakpoint = clone_momentary_breakpoint |
475 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
476 | step_range_start = tp->control.step_range_start; |
477 | step_range_end = tp->control.step_range_end; | |
478 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
479 | exception_resume_breakpoint |
480 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
e58b0e63 PA |
481 | |
482 | /* For now, delete the parent's sr breakpoint, otherwise, | |
483 | parent/child sr breakpoints are considered duplicates, | |
484 | and the child version will not be installed. Remove | |
485 | this when the breakpoints module becomes aware of | |
486 | inferiors and address spaces. */ | |
487 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
488 | tp->control.step_range_start = 0; |
489 | tp->control.step_range_end = 0; | |
490 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 491 | delete_exception_resume_breakpoint (tp); |
e58b0e63 PA |
492 | } |
493 | ||
494 | parent = inferior_ptid; | |
495 | child = tp->pending_follow.value.related_pid; | |
496 | ||
497 | /* Tell the target to do whatever is necessary to follow | |
498 | either parent or child. */ | |
499 | if (target_follow_fork (follow_child)) | |
500 | { | |
501 | /* Target refused to follow, or there's some other reason | |
502 | we shouldn't resume. */ | |
503 | should_resume = 0; | |
504 | } | |
505 | else | |
506 | { | |
507 | /* This pending follow fork event is now handled, one way | |
508 | or another. The previous selected thread may be gone | |
509 | from the lists by now, but if it is still around, need | |
510 | to clear the pending follow request. */ | |
e09875d4 | 511 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
512 | if (tp) |
513 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
514 | ||
515 | /* This makes sure we don't try to apply the "Switched | |
516 | over from WAIT_PID" logic above. */ | |
517 | nullify_last_target_wait_ptid (); | |
518 | ||
1777feb0 | 519 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
520 | if (follow_child) |
521 | { | |
522 | switch_to_thread (child); | |
523 | ||
524 | /* ... and preserve the stepping state, in case the | |
525 | user was stepping over the fork call. */ | |
526 | if (should_resume) | |
527 | { | |
528 | tp = inferior_thread (); | |
8358c15c JK |
529 | tp->control.step_resume_breakpoint |
530 | = step_resume_breakpoint; | |
16c381f0 JK |
531 | tp->control.step_range_start = step_range_start; |
532 | tp->control.step_range_end = step_range_end; | |
533 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
534 | tp->control.exception_resume_breakpoint |
535 | = exception_resume_breakpoint; | |
e58b0e63 PA |
536 | } |
537 | else | |
538 | { | |
539 | /* If we get here, it was because we're trying to | |
540 | resume from a fork catchpoint, but, the user | |
541 | has switched threads away from the thread that | |
542 | forked. In that case, the resume command | |
543 | issued is most likely not applicable to the | |
544 | child, so just warn, and refuse to resume. */ | |
3e43a32a MS |
545 | warning (_("Not resuming: switched threads " |
546 | "before following fork child.\n")); | |
e58b0e63 PA |
547 | } |
548 | ||
549 | /* Reset breakpoints in the child as appropriate. */ | |
550 | follow_inferior_reset_breakpoints (); | |
551 | } | |
552 | else | |
553 | switch_to_thread (parent); | |
554 | } | |
555 | } | |
556 | break; | |
557 | case TARGET_WAITKIND_SPURIOUS: | |
558 | /* Nothing to follow. */ | |
559 | break; | |
560 | default: | |
561 | internal_error (__FILE__, __LINE__, | |
562 | "Unexpected pending_follow.kind %d\n", | |
563 | tp->pending_follow.kind); | |
564 | break; | |
565 | } | |
c906108c | 566 | |
e58b0e63 | 567 | return should_resume; |
c906108c SS |
568 | } |
569 | ||
6604731b DJ |
570 | void |
571 | follow_inferior_reset_breakpoints (void) | |
c906108c | 572 | { |
4e1c45ea PA |
573 | struct thread_info *tp = inferior_thread (); |
574 | ||
6604731b DJ |
575 | /* Was there a step_resume breakpoint? (There was if the user |
576 | did a "next" at the fork() call.) If so, explicitly reset its | |
577 | thread number. | |
578 | ||
579 | step_resumes are a form of bp that are made to be per-thread. | |
580 | Since we created the step_resume bp when the parent process | |
581 | was being debugged, and now are switching to the child process, | |
582 | from the breakpoint package's viewpoint, that's a switch of | |
583 | "threads". We must update the bp's notion of which thread | |
584 | it is for, or it'll be ignored when it triggers. */ | |
585 | ||
8358c15c JK |
586 | if (tp->control.step_resume_breakpoint) |
587 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
6604731b | 588 | |
186c406b TT |
589 | if (tp->control.exception_resume_breakpoint) |
590 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
591 | ||
6604731b DJ |
592 | /* Reinsert all breakpoints in the child. The user may have set |
593 | breakpoints after catching the fork, in which case those | |
594 | were never set in the child, but only in the parent. This makes | |
595 | sure the inserted breakpoints match the breakpoint list. */ | |
596 | ||
597 | breakpoint_re_set (); | |
598 | insert_breakpoints (); | |
c906108c | 599 | } |
c906108c | 600 | |
6c95b8df PA |
601 | /* The child has exited or execed: resume threads of the parent the |
602 | user wanted to be executing. */ | |
603 | ||
604 | static int | |
605 | proceed_after_vfork_done (struct thread_info *thread, | |
606 | void *arg) | |
607 | { | |
608 | int pid = * (int *) arg; | |
609 | ||
610 | if (ptid_get_pid (thread->ptid) == pid | |
611 | && is_running (thread->ptid) | |
612 | && !is_executing (thread->ptid) | |
613 | && !thread->stop_requested | |
16c381f0 | 614 | && thread->suspend.stop_signal == TARGET_SIGNAL_0) |
6c95b8df PA |
615 | { |
616 | if (debug_infrun) | |
617 | fprintf_unfiltered (gdb_stdlog, | |
618 | "infrun: resuming vfork parent thread %s\n", | |
619 | target_pid_to_str (thread->ptid)); | |
620 | ||
621 | switch_to_thread (thread->ptid); | |
622 | clear_proceed_status (); | |
623 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_DEFAULT, 0); | |
624 | } | |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
629 | /* Called whenever we notice an exec or exit event, to handle | |
630 | detaching or resuming a vfork parent. */ | |
631 | ||
632 | static void | |
633 | handle_vfork_child_exec_or_exit (int exec) | |
634 | { | |
635 | struct inferior *inf = current_inferior (); | |
636 | ||
637 | if (inf->vfork_parent) | |
638 | { | |
639 | int resume_parent = -1; | |
640 | ||
641 | /* This exec or exit marks the end of the shared memory region | |
642 | between the parent and the child. If the user wanted to | |
643 | detach from the parent, now is the time. */ | |
644 | ||
645 | if (inf->vfork_parent->pending_detach) | |
646 | { | |
647 | struct thread_info *tp; | |
648 | struct cleanup *old_chain; | |
649 | struct program_space *pspace; | |
650 | struct address_space *aspace; | |
651 | ||
1777feb0 | 652 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df PA |
653 | |
654 | old_chain = make_cleanup_restore_current_thread (); | |
655 | ||
656 | /* We're letting loose of the parent. */ | |
657 | tp = any_live_thread_of_process (inf->vfork_parent->pid); | |
658 | switch_to_thread (tp->ptid); | |
659 | ||
660 | /* We're about to detach from the parent, which implicitly | |
661 | removes breakpoints from its address space. There's a | |
662 | catch here: we want to reuse the spaces for the child, | |
663 | but, parent/child are still sharing the pspace at this | |
664 | point, although the exec in reality makes the kernel give | |
665 | the child a fresh set of new pages. The problem here is | |
666 | that the breakpoints module being unaware of this, would | |
667 | likely chose the child process to write to the parent | |
668 | address space. Swapping the child temporarily away from | |
669 | the spaces has the desired effect. Yes, this is "sort | |
670 | of" a hack. */ | |
671 | ||
672 | pspace = inf->pspace; | |
673 | aspace = inf->aspace; | |
674 | inf->aspace = NULL; | |
675 | inf->pspace = NULL; | |
676 | ||
677 | if (debug_infrun || info_verbose) | |
678 | { | |
679 | target_terminal_ours (); | |
680 | ||
681 | if (exec) | |
682 | fprintf_filtered (gdb_stdlog, | |
3e43a32a MS |
683 | "Detaching vfork parent process " |
684 | "%d after child exec.\n", | |
6c95b8df PA |
685 | inf->vfork_parent->pid); |
686 | else | |
687 | fprintf_filtered (gdb_stdlog, | |
3e43a32a MS |
688 | "Detaching vfork parent process " |
689 | "%d after child exit.\n", | |
6c95b8df PA |
690 | inf->vfork_parent->pid); |
691 | } | |
692 | ||
693 | target_detach (NULL, 0); | |
694 | ||
695 | /* Put it back. */ | |
696 | inf->pspace = pspace; | |
697 | inf->aspace = aspace; | |
698 | ||
699 | do_cleanups (old_chain); | |
700 | } | |
701 | else if (exec) | |
702 | { | |
703 | /* We're staying attached to the parent, so, really give the | |
704 | child a new address space. */ | |
705 | inf->pspace = add_program_space (maybe_new_address_space ()); | |
706 | inf->aspace = inf->pspace->aspace; | |
707 | inf->removable = 1; | |
708 | set_current_program_space (inf->pspace); | |
709 | ||
710 | resume_parent = inf->vfork_parent->pid; | |
711 | ||
712 | /* Break the bonds. */ | |
713 | inf->vfork_parent->vfork_child = NULL; | |
714 | } | |
715 | else | |
716 | { | |
717 | struct cleanup *old_chain; | |
718 | struct program_space *pspace; | |
719 | ||
720 | /* If this is a vfork child exiting, then the pspace and | |
721 | aspaces were shared with the parent. Since we're | |
722 | reporting the process exit, we'll be mourning all that is | |
723 | found in the address space, and switching to null_ptid, | |
724 | preparing to start a new inferior. But, since we don't | |
725 | want to clobber the parent's address/program spaces, we | |
726 | go ahead and create a new one for this exiting | |
727 | inferior. */ | |
728 | ||
729 | /* Switch to null_ptid, so that clone_program_space doesn't want | |
730 | to read the selected frame of a dead process. */ | |
731 | old_chain = save_inferior_ptid (); | |
732 | inferior_ptid = null_ptid; | |
733 | ||
734 | /* This inferior is dead, so avoid giving the breakpoints | |
735 | module the option to write through to it (cloning a | |
736 | program space resets breakpoints). */ | |
737 | inf->aspace = NULL; | |
738 | inf->pspace = NULL; | |
739 | pspace = add_program_space (maybe_new_address_space ()); | |
740 | set_current_program_space (pspace); | |
741 | inf->removable = 1; | |
742 | clone_program_space (pspace, inf->vfork_parent->pspace); | |
743 | inf->pspace = pspace; | |
744 | inf->aspace = pspace->aspace; | |
745 | ||
746 | /* Put back inferior_ptid. We'll continue mourning this | |
1777feb0 | 747 | inferior. */ |
6c95b8df PA |
748 | do_cleanups (old_chain); |
749 | ||
750 | resume_parent = inf->vfork_parent->pid; | |
751 | /* Break the bonds. */ | |
752 | inf->vfork_parent->vfork_child = NULL; | |
753 | } | |
754 | ||
755 | inf->vfork_parent = NULL; | |
756 | ||
757 | gdb_assert (current_program_space == inf->pspace); | |
758 | ||
759 | if (non_stop && resume_parent != -1) | |
760 | { | |
761 | /* If the user wanted the parent to be running, let it go | |
762 | free now. */ | |
763 | struct cleanup *old_chain = make_cleanup_restore_current_thread (); | |
764 | ||
765 | if (debug_infrun) | |
3e43a32a MS |
766 | fprintf_unfiltered (gdb_stdlog, |
767 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
768 | resume_parent); |
769 | ||
770 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
771 | ||
772 | do_cleanups (old_chain); | |
773 | } | |
774 | } | |
775 | } | |
776 | ||
777 | /* Enum strings for "set|show displaced-stepping". */ | |
778 | ||
779 | static const char follow_exec_mode_new[] = "new"; | |
780 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 781 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
782 | { |
783 | follow_exec_mode_new, | |
784 | follow_exec_mode_same, | |
785 | NULL, | |
786 | }; | |
787 | ||
788 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
789 | static void | |
790 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
791 | struct cmd_list_element *c, const char *value) | |
792 | { | |
793 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
794 | } | |
795 | ||
1777feb0 | 796 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
1adeb98a | 797 | |
c906108c | 798 | static void |
3a3e9ee3 | 799 | follow_exec (ptid_t pid, char *execd_pathname) |
c906108c | 800 | { |
4e1c45ea | 801 | struct thread_info *th = inferior_thread (); |
6c95b8df | 802 | struct inferior *inf = current_inferior (); |
7a292a7a | 803 | |
c906108c SS |
804 | /* This is an exec event that we actually wish to pay attention to. |
805 | Refresh our symbol table to the newly exec'd program, remove any | |
806 | momentary bp's, etc. | |
807 | ||
808 | If there are breakpoints, they aren't really inserted now, | |
809 | since the exec() transformed our inferior into a fresh set | |
810 | of instructions. | |
811 | ||
812 | We want to preserve symbolic breakpoints on the list, since | |
813 | we have hopes that they can be reset after the new a.out's | |
814 | symbol table is read. | |
815 | ||
816 | However, any "raw" breakpoints must be removed from the list | |
817 | (e.g., the solib bp's), since their address is probably invalid | |
818 | now. | |
819 | ||
820 | And, we DON'T want to call delete_breakpoints() here, since | |
821 | that may write the bp's "shadow contents" (the instruction | |
822 | value that was overwritten witha TRAP instruction). Since | |
1777feb0 | 823 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
824 | |
825 | mark_breakpoints_out (); | |
826 | ||
c906108c SS |
827 | update_breakpoints_after_exec (); |
828 | ||
829 | /* If there was one, it's gone now. We cannot truly step-to-next | |
1777feb0 | 830 | statement through an exec(). */ |
8358c15c | 831 | th->control.step_resume_breakpoint = NULL; |
186c406b | 832 | th->control.exception_resume_breakpoint = NULL; |
16c381f0 JK |
833 | th->control.step_range_start = 0; |
834 | th->control.step_range_end = 0; | |
c906108c | 835 | |
a75724bc PA |
836 | /* The target reports the exec event to the main thread, even if |
837 | some other thread does the exec, and even if the main thread was | |
838 | already stopped --- if debugging in non-stop mode, it's possible | |
839 | the user had the main thread held stopped in the previous image | |
840 | --- release it now. This is the same behavior as step-over-exec | |
841 | with scheduler-locking on in all-stop mode. */ | |
842 | th->stop_requested = 0; | |
843 | ||
1777feb0 | 844 | /* What is this a.out's name? */ |
6c95b8df PA |
845 | printf_unfiltered (_("%s is executing new program: %s\n"), |
846 | target_pid_to_str (inferior_ptid), | |
847 | execd_pathname); | |
c906108c SS |
848 | |
849 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 850 | inferior has essentially been killed & reborn. */ |
7a292a7a | 851 | |
c906108c | 852 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
853 | |
854 | breakpoint_init_inferior (inf_execd); | |
e85a822c DJ |
855 | |
856 | if (gdb_sysroot && *gdb_sysroot) | |
857 | { | |
858 | char *name = alloca (strlen (gdb_sysroot) | |
859 | + strlen (execd_pathname) | |
860 | + 1); | |
abbb1732 | 861 | |
e85a822c DJ |
862 | strcpy (name, gdb_sysroot); |
863 | strcat (name, execd_pathname); | |
864 | execd_pathname = name; | |
865 | } | |
c906108c | 866 | |
cce9b6bf PA |
867 | /* Reset the shared library package. This ensures that we get a |
868 | shlib event when the child reaches "_start", at which point the | |
869 | dld will have had a chance to initialize the child. */ | |
870 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
871 | we don't want those to be satisfied by the libraries of the | |
872 | previous incarnation of this process. */ | |
873 | no_shared_libraries (NULL, 0); | |
874 | ||
6c95b8df PA |
875 | if (follow_exec_mode_string == follow_exec_mode_new) |
876 | { | |
877 | struct program_space *pspace; | |
6c95b8df PA |
878 | |
879 | /* The user wants to keep the old inferior and program spaces | |
880 | around. Create a new fresh one, and switch to it. */ | |
881 | ||
882 | inf = add_inferior (current_inferior ()->pid); | |
883 | pspace = add_program_space (maybe_new_address_space ()); | |
884 | inf->pspace = pspace; | |
885 | inf->aspace = pspace->aspace; | |
886 | ||
887 | exit_inferior_num_silent (current_inferior ()->num); | |
888 | ||
889 | set_current_inferior (inf); | |
890 | set_current_program_space (pspace); | |
891 | } | |
892 | ||
893 | gdb_assert (current_program_space == inf->pspace); | |
894 | ||
1777feb0 | 895 | /* That a.out is now the one to use. */ |
6c95b8df PA |
896 | exec_file_attach (execd_pathname, 0); |
897 | ||
c1e56572 JK |
898 | /* SYMFILE_DEFER_BP_RESET is used as the proper displacement for PIE |
899 | (Position Independent Executable) main symbol file will get applied by | |
900 | solib_create_inferior_hook below. breakpoint_re_set would fail to insert | |
901 | the breakpoints with the zero displacement. */ | |
902 | ||
903 | symbol_file_add (execd_pathname, SYMFILE_MAINLINE | SYMFILE_DEFER_BP_RESET, | |
904 | NULL, 0); | |
905 | ||
906 | set_initial_language (); | |
c906108c | 907 | |
7a292a7a | 908 | #ifdef SOLIB_CREATE_INFERIOR_HOOK |
39f77062 | 909 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
a77053c2 | 910 | #else |
268a4a75 | 911 | solib_create_inferior_hook (0); |
7a292a7a | 912 | #endif |
c906108c | 913 | |
4efc6507 DE |
914 | jit_inferior_created_hook (); |
915 | ||
c1e56572 JK |
916 | breakpoint_re_set (); |
917 | ||
c906108c SS |
918 | /* Reinsert all breakpoints. (Those which were symbolic have |
919 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 920 | to symbol_file_command...). */ |
c906108c SS |
921 | insert_breakpoints (); |
922 | ||
923 | /* The next resume of this inferior should bring it to the shlib | |
924 | startup breakpoints. (If the user had also set bp's on | |
925 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 926 | matically get reset there in the new process.). */ |
c906108c SS |
927 | } |
928 | ||
929 | /* Non-zero if we just simulating a single-step. This is needed | |
930 | because we cannot remove the breakpoints in the inferior process | |
931 | until after the `wait' in `wait_for_inferior'. */ | |
932 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
933 | |
934 | /* The thread we inserted single-step breakpoints for. */ | |
935 | static ptid_t singlestep_ptid; | |
936 | ||
fd48f117 DJ |
937 | /* PC when we started this single-step. */ |
938 | static CORE_ADDR singlestep_pc; | |
939 | ||
9f976b41 DJ |
940 | /* If another thread hit the singlestep breakpoint, we save the original |
941 | thread here so that we can resume single-stepping it later. */ | |
942 | static ptid_t saved_singlestep_ptid; | |
943 | static int stepping_past_singlestep_breakpoint; | |
6a6b96b9 | 944 | |
ca67fcb8 VP |
945 | /* If not equal to null_ptid, this means that after stepping over breakpoint |
946 | is finished, we need to switch to deferred_step_ptid, and step it. | |
947 | ||
948 | The use case is when one thread has hit a breakpoint, and then the user | |
1777feb0 | 949 | has switched to another thread and issued 'step'. We need to step over |
ca67fcb8 VP |
950 | breakpoint in the thread which hit the breakpoint, but then continue |
951 | stepping the thread user has selected. */ | |
952 | static ptid_t deferred_step_ptid; | |
c906108c | 953 | \f |
237fc4c9 PA |
954 | /* Displaced stepping. */ |
955 | ||
956 | /* In non-stop debugging mode, we must take special care to manage | |
957 | breakpoints properly; in particular, the traditional strategy for | |
958 | stepping a thread past a breakpoint it has hit is unsuitable. | |
959 | 'Displaced stepping' is a tactic for stepping one thread past a | |
960 | breakpoint it has hit while ensuring that other threads running | |
961 | concurrently will hit the breakpoint as they should. | |
962 | ||
963 | The traditional way to step a thread T off a breakpoint in a | |
964 | multi-threaded program in all-stop mode is as follows: | |
965 | ||
966 | a0) Initially, all threads are stopped, and breakpoints are not | |
967 | inserted. | |
968 | a1) We single-step T, leaving breakpoints uninserted. | |
969 | a2) We insert breakpoints, and resume all threads. | |
970 | ||
971 | In non-stop debugging, however, this strategy is unsuitable: we | |
972 | don't want to have to stop all threads in the system in order to | |
973 | continue or step T past a breakpoint. Instead, we use displaced | |
974 | stepping: | |
975 | ||
976 | n0) Initially, T is stopped, other threads are running, and | |
977 | breakpoints are inserted. | |
978 | n1) We copy the instruction "under" the breakpoint to a separate | |
979 | location, outside the main code stream, making any adjustments | |
980 | to the instruction, register, and memory state as directed by | |
981 | T's architecture. | |
982 | n2) We single-step T over the instruction at its new location. | |
983 | n3) We adjust the resulting register and memory state as directed | |
984 | by T's architecture. This includes resetting T's PC to point | |
985 | back into the main instruction stream. | |
986 | n4) We resume T. | |
987 | ||
988 | This approach depends on the following gdbarch methods: | |
989 | ||
990 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
991 | indicate where to copy the instruction, and how much space must | |
992 | be reserved there. We use these in step n1. | |
993 | ||
994 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
995 | address, and makes any necessary adjustments to the instruction, | |
996 | register contents, and memory. We use this in step n1. | |
997 | ||
998 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
999 | we have successfuly single-stepped the instruction, to yield the | |
1000 | same effect the instruction would have had if we had executed it | |
1001 | at its original address. We use this in step n3. | |
1002 | ||
1003 | - gdbarch_displaced_step_free_closure provides cleanup. | |
1004 | ||
1005 | The gdbarch_displaced_step_copy_insn and | |
1006 | gdbarch_displaced_step_fixup functions must be written so that | |
1007 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1008 | single-stepping across the copied instruction, and then applying | |
1009 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1010 | thread's memory and registers as stepping the instruction in place | |
1011 | would have. Exactly which responsibilities fall to the copy and | |
1012 | which fall to the fixup is up to the author of those functions. | |
1013 | ||
1014 | See the comments in gdbarch.sh for details. | |
1015 | ||
1016 | Note that displaced stepping and software single-step cannot | |
1017 | currently be used in combination, although with some care I think | |
1018 | they could be made to. Software single-step works by placing | |
1019 | breakpoints on all possible subsequent instructions; if the | |
1020 | displaced instruction is a PC-relative jump, those breakpoints | |
1021 | could fall in very strange places --- on pages that aren't | |
1022 | executable, or at addresses that are not proper instruction | |
1023 | boundaries. (We do generally let other threads run while we wait | |
1024 | to hit the software single-step breakpoint, and they might | |
1025 | encounter such a corrupted instruction.) One way to work around | |
1026 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1027 | simulate the effect of PC-relative instructions (and return NULL) | |
1028 | on architectures that use software single-stepping. | |
1029 | ||
1030 | In non-stop mode, we can have independent and simultaneous step | |
1031 | requests, so more than one thread may need to simultaneously step | |
1032 | over a breakpoint. The current implementation assumes there is | |
1033 | only one scratch space per process. In this case, we have to | |
1034 | serialize access to the scratch space. If thread A wants to step | |
1035 | over a breakpoint, but we are currently waiting for some other | |
1036 | thread to complete a displaced step, we leave thread A stopped and | |
1037 | place it in the displaced_step_request_queue. Whenever a displaced | |
1038 | step finishes, we pick the next thread in the queue and start a new | |
1039 | displaced step operation on it. See displaced_step_prepare and | |
1040 | displaced_step_fixup for details. */ | |
1041 | ||
237fc4c9 PA |
1042 | struct displaced_step_request |
1043 | { | |
1044 | ptid_t ptid; | |
1045 | struct displaced_step_request *next; | |
1046 | }; | |
1047 | ||
fc1cf338 PA |
1048 | /* Per-inferior displaced stepping state. */ |
1049 | struct displaced_step_inferior_state | |
1050 | { | |
1051 | /* Pointer to next in linked list. */ | |
1052 | struct displaced_step_inferior_state *next; | |
1053 | ||
1054 | /* The process this displaced step state refers to. */ | |
1055 | int pid; | |
1056 | ||
1057 | /* A queue of pending displaced stepping requests. One entry per | |
1058 | thread that needs to do a displaced step. */ | |
1059 | struct displaced_step_request *step_request_queue; | |
1060 | ||
1061 | /* If this is not null_ptid, this is the thread carrying out a | |
1062 | displaced single-step in process PID. This thread's state will | |
1063 | require fixing up once it has completed its step. */ | |
1064 | ptid_t step_ptid; | |
1065 | ||
1066 | /* The architecture the thread had when we stepped it. */ | |
1067 | struct gdbarch *step_gdbarch; | |
1068 | ||
1069 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
1070 | for post-step cleanup. */ | |
1071 | struct displaced_step_closure *step_closure; | |
1072 | ||
1073 | /* The address of the original instruction, and the copy we | |
1074 | made. */ | |
1075 | CORE_ADDR step_original, step_copy; | |
1076 | ||
1077 | /* Saved contents of copy area. */ | |
1078 | gdb_byte *step_saved_copy; | |
1079 | }; | |
1080 | ||
1081 | /* The list of states of processes involved in displaced stepping | |
1082 | presently. */ | |
1083 | static struct displaced_step_inferior_state *displaced_step_inferior_states; | |
1084 | ||
1085 | /* Get the displaced stepping state of process PID. */ | |
1086 | ||
1087 | static struct displaced_step_inferior_state * | |
1088 | get_displaced_stepping_state (int pid) | |
1089 | { | |
1090 | struct displaced_step_inferior_state *state; | |
1091 | ||
1092 | for (state = displaced_step_inferior_states; | |
1093 | state != NULL; | |
1094 | state = state->next) | |
1095 | if (state->pid == pid) | |
1096 | return state; | |
1097 | ||
1098 | return NULL; | |
1099 | } | |
1100 | ||
1101 | /* Add a new displaced stepping state for process PID to the displaced | |
1102 | stepping state list, or return a pointer to an already existing | |
1103 | entry, if it already exists. Never returns NULL. */ | |
1104 | ||
1105 | static struct displaced_step_inferior_state * | |
1106 | add_displaced_stepping_state (int pid) | |
1107 | { | |
1108 | struct displaced_step_inferior_state *state; | |
1109 | ||
1110 | for (state = displaced_step_inferior_states; | |
1111 | state != NULL; | |
1112 | state = state->next) | |
1113 | if (state->pid == pid) | |
1114 | return state; | |
237fc4c9 | 1115 | |
fc1cf338 PA |
1116 | state = xcalloc (1, sizeof (*state)); |
1117 | state->pid = pid; | |
1118 | state->next = displaced_step_inferior_states; | |
1119 | displaced_step_inferior_states = state; | |
237fc4c9 | 1120 | |
fc1cf338 PA |
1121 | return state; |
1122 | } | |
1123 | ||
a42244db YQ |
1124 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1125 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1126 | return NULL. */ | |
1127 | ||
1128 | struct displaced_step_closure* | |
1129 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1130 | { | |
1131 | struct displaced_step_inferior_state *displaced | |
1132 | = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); | |
1133 | ||
1134 | /* If checking the mode of displaced instruction in copy area. */ | |
1135 | if (displaced && !ptid_equal (displaced->step_ptid, null_ptid) | |
1136 | && (displaced->step_copy == addr)) | |
1137 | return displaced->step_closure; | |
1138 | ||
1139 | return NULL; | |
1140 | } | |
1141 | ||
fc1cf338 | 1142 | /* Remove the displaced stepping state of process PID. */ |
237fc4c9 | 1143 | |
fc1cf338 PA |
1144 | static void |
1145 | remove_displaced_stepping_state (int pid) | |
1146 | { | |
1147 | struct displaced_step_inferior_state *it, **prev_next_p; | |
237fc4c9 | 1148 | |
fc1cf338 PA |
1149 | gdb_assert (pid != 0); |
1150 | ||
1151 | it = displaced_step_inferior_states; | |
1152 | prev_next_p = &displaced_step_inferior_states; | |
1153 | while (it) | |
1154 | { | |
1155 | if (it->pid == pid) | |
1156 | { | |
1157 | *prev_next_p = it->next; | |
1158 | xfree (it); | |
1159 | return; | |
1160 | } | |
1161 | ||
1162 | prev_next_p = &it->next; | |
1163 | it = *prev_next_p; | |
1164 | } | |
1165 | } | |
1166 | ||
1167 | static void | |
1168 | infrun_inferior_exit (struct inferior *inf) | |
1169 | { | |
1170 | remove_displaced_stepping_state (inf->pid); | |
1171 | } | |
237fc4c9 | 1172 | |
fff08868 HZ |
1173 | /* Enum strings for "set|show displaced-stepping". */ |
1174 | ||
1175 | static const char can_use_displaced_stepping_auto[] = "auto"; | |
1176 | static const char can_use_displaced_stepping_on[] = "on"; | |
1177 | static const char can_use_displaced_stepping_off[] = "off"; | |
40478521 | 1178 | static const char *const can_use_displaced_stepping_enum[] = |
fff08868 HZ |
1179 | { |
1180 | can_use_displaced_stepping_auto, | |
1181 | can_use_displaced_stepping_on, | |
1182 | can_use_displaced_stepping_off, | |
1183 | NULL, | |
1184 | }; | |
1185 | ||
1186 | /* If ON, and the architecture supports it, GDB will use displaced | |
1187 | stepping to step over breakpoints. If OFF, or if the architecture | |
1188 | doesn't support it, GDB will instead use the traditional | |
1189 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1190 | decide which technique to use to step over breakpoints depending on | |
1191 | which of all-stop or non-stop mode is active --- displaced stepping | |
1192 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1193 | ||
1194 | static const char *can_use_displaced_stepping = | |
1195 | can_use_displaced_stepping_auto; | |
1196 | ||
237fc4c9 PA |
1197 | static void |
1198 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1199 | struct cmd_list_element *c, | |
1200 | const char *value) | |
1201 | { | |
fff08868 | 1202 | if (can_use_displaced_stepping == can_use_displaced_stepping_auto) |
3e43a32a MS |
1203 | fprintf_filtered (file, |
1204 | _("Debugger's willingness to use displaced stepping " | |
1205 | "to step over breakpoints is %s (currently %s).\n"), | |
fff08868 HZ |
1206 | value, non_stop ? "on" : "off"); |
1207 | else | |
3e43a32a MS |
1208 | fprintf_filtered (file, |
1209 | _("Debugger's willingness to use displaced stepping " | |
1210 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1211 | } |
1212 | ||
fff08868 HZ |
1213 | /* Return non-zero if displaced stepping can/should be used to step |
1214 | over breakpoints. */ | |
1215 | ||
237fc4c9 PA |
1216 | static int |
1217 | use_displaced_stepping (struct gdbarch *gdbarch) | |
1218 | { | |
fff08868 HZ |
1219 | return (((can_use_displaced_stepping == can_use_displaced_stepping_auto |
1220 | && non_stop) | |
1221 | || can_use_displaced_stepping == can_use_displaced_stepping_on) | |
96429cc8 HZ |
1222 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
1223 | && !RECORD_IS_USED); | |
237fc4c9 PA |
1224 | } |
1225 | ||
1226 | /* Clean out any stray displaced stepping state. */ | |
1227 | static void | |
fc1cf338 | 1228 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1229 | { |
1230 | /* Indicate that there is no cleanup pending. */ | |
fc1cf338 | 1231 | displaced->step_ptid = null_ptid; |
237fc4c9 | 1232 | |
fc1cf338 | 1233 | if (displaced->step_closure) |
237fc4c9 | 1234 | { |
fc1cf338 PA |
1235 | gdbarch_displaced_step_free_closure (displaced->step_gdbarch, |
1236 | displaced->step_closure); | |
1237 | displaced->step_closure = NULL; | |
237fc4c9 PA |
1238 | } |
1239 | } | |
1240 | ||
1241 | static void | |
fc1cf338 | 1242 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1243 | { |
fc1cf338 PA |
1244 | struct displaced_step_inferior_state *state = arg; |
1245 | ||
1246 | displaced_step_clear (state); | |
237fc4c9 PA |
1247 | } |
1248 | ||
1249 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1250 | void | |
1251 | displaced_step_dump_bytes (struct ui_file *file, | |
1252 | const gdb_byte *buf, | |
1253 | size_t len) | |
1254 | { | |
1255 | int i; | |
1256 | ||
1257 | for (i = 0; i < len; i++) | |
1258 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1259 | fputs_unfiltered ("\n", file); | |
1260 | } | |
1261 | ||
1262 | /* Prepare to single-step, using displaced stepping. | |
1263 | ||
1264 | Note that we cannot use displaced stepping when we have a signal to | |
1265 | deliver. If we have a signal to deliver and an instruction to step | |
1266 | over, then after the step, there will be no indication from the | |
1267 | target whether the thread entered a signal handler or ignored the | |
1268 | signal and stepped over the instruction successfully --- both cases | |
1269 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1270 | fixup, and in the second case we must --- but we can't tell which. | |
1271 | Comments in the code for 'random signals' in handle_inferior_event | |
1272 | explain how we handle this case instead. | |
1273 | ||
1274 | Returns 1 if preparing was successful -- this thread is going to be | |
1275 | stepped now; or 0 if displaced stepping this thread got queued. */ | |
1276 | static int | |
1277 | displaced_step_prepare (ptid_t ptid) | |
1278 | { | |
ad53cd71 | 1279 | struct cleanup *old_cleanups, *ignore_cleanups; |
237fc4c9 PA |
1280 | struct regcache *regcache = get_thread_regcache (ptid); |
1281 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1282 | CORE_ADDR original, copy; | |
1283 | ULONGEST len; | |
1284 | struct displaced_step_closure *closure; | |
fc1cf338 | 1285 | struct displaced_step_inferior_state *displaced; |
237fc4c9 PA |
1286 | |
1287 | /* We should never reach this function if the architecture does not | |
1288 | support displaced stepping. */ | |
1289 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1290 | ||
fc1cf338 PA |
1291 | /* We have to displaced step one thread at a time, as we only have |
1292 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1293 | |
fc1cf338 PA |
1294 | displaced = add_displaced_stepping_state (ptid_get_pid (ptid)); |
1295 | ||
1296 | if (!ptid_equal (displaced->step_ptid, null_ptid)) | |
237fc4c9 PA |
1297 | { |
1298 | /* Already waiting for a displaced step to finish. Defer this | |
1299 | request and place in queue. */ | |
1300 | struct displaced_step_request *req, *new_req; | |
1301 | ||
1302 | if (debug_displaced) | |
1303 | fprintf_unfiltered (gdb_stdlog, | |
1304 | "displaced: defering step of %s\n", | |
1305 | target_pid_to_str (ptid)); | |
1306 | ||
1307 | new_req = xmalloc (sizeof (*new_req)); | |
1308 | new_req->ptid = ptid; | |
1309 | new_req->next = NULL; | |
1310 | ||
fc1cf338 | 1311 | if (displaced->step_request_queue) |
237fc4c9 | 1312 | { |
fc1cf338 | 1313 | for (req = displaced->step_request_queue; |
237fc4c9 PA |
1314 | req && req->next; |
1315 | req = req->next) | |
1316 | ; | |
1317 | req->next = new_req; | |
1318 | } | |
1319 | else | |
fc1cf338 | 1320 | displaced->step_request_queue = new_req; |
237fc4c9 PA |
1321 | |
1322 | return 0; | |
1323 | } | |
1324 | else | |
1325 | { | |
1326 | if (debug_displaced) | |
1327 | fprintf_unfiltered (gdb_stdlog, | |
1328 | "displaced: stepping %s now\n", | |
1329 | target_pid_to_str (ptid)); | |
1330 | } | |
1331 | ||
fc1cf338 | 1332 | displaced_step_clear (displaced); |
237fc4c9 | 1333 | |
ad53cd71 PA |
1334 | old_cleanups = save_inferior_ptid (); |
1335 | inferior_ptid = ptid; | |
1336 | ||
515630c5 | 1337 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1338 | |
1339 | copy = gdbarch_displaced_step_location (gdbarch); | |
1340 | len = gdbarch_max_insn_length (gdbarch); | |
1341 | ||
1342 | /* Save the original contents of the copy area. */ | |
fc1cf338 | 1343 | displaced->step_saved_copy = xmalloc (len); |
ad53cd71 | 1344 | ignore_cleanups = make_cleanup (free_current_contents, |
fc1cf338 PA |
1345 | &displaced->step_saved_copy); |
1346 | read_memory (copy, displaced->step_saved_copy, len); | |
237fc4c9 PA |
1347 | if (debug_displaced) |
1348 | { | |
5af949e3 UW |
1349 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1350 | paddress (gdbarch, copy)); | |
fc1cf338 PA |
1351 | displaced_step_dump_bytes (gdb_stdlog, |
1352 | displaced->step_saved_copy, | |
1353 | len); | |
237fc4c9 PA |
1354 | }; |
1355 | ||
1356 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1357 | original, copy, regcache); |
237fc4c9 PA |
1358 | |
1359 | /* We don't support the fully-simulated case at present. */ | |
1360 | gdb_assert (closure); | |
1361 | ||
9f5a595d UW |
1362 | /* Save the information we need to fix things up if the step |
1363 | succeeds. */ | |
fc1cf338 PA |
1364 | displaced->step_ptid = ptid; |
1365 | displaced->step_gdbarch = gdbarch; | |
1366 | displaced->step_closure = closure; | |
1367 | displaced->step_original = original; | |
1368 | displaced->step_copy = copy; | |
9f5a595d | 1369 | |
fc1cf338 | 1370 | make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1371 | |
1372 | /* Resume execution at the copy. */ | |
515630c5 | 1373 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1374 | |
ad53cd71 PA |
1375 | discard_cleanups (ignore_cleanups); |
1376 | ||
1377 | do_cleanups (old_cleanups); | |
237fc4c9 PA |
1378 | |
1379 | if (debug_displaced) | |
5af949e3 UW |
1380 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1381 | paddress (gdbarch, copy)); | |
237fc4c9 | 1382 | |
237fc4c9 PA |
1383 | return 1; |
1384 | } | |
1385 | ||
237fc4c9 | 1386 | static void |
3e43a32a MS |
1387 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1388 | const gdb_byte *myaddr, int len) | |
237fc4c9 PA |
1389 | { |
1390 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
abbb1732 | 1391 | |
237fc4c9 PA |
1392 | inferior_ptid = ptid; |
1393 | write_memory (memaddr, myaddr, len); | |
1394 | do_cleanups (ptid_cleanup); | |
1395 | } | |
1396 | ||
e2d96639 YQ |
1397 | /* Restore the contents of the copy area for thread PTID. */ |
1398 | ||
1399 | static void | |
1400 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1401 | ptid_t ptid) | |
1402 | { | |
1403 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1404 | ||
1405 | write_memory_ptid (ptid, displaced->step_copy, | |
1406 | displaced->step_saved_copy, len); | |
1407 | if (debug_displaced) | |
1408 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
1409 | target_pid_to_str (ptid), | |
1410 | paddress (displaced->step_gdbarch, | |
1411 | displaced->step_copy)); | |
1412 | } | |
1413 | ||
237fc4c9 PA |
1414 | static void |
1415 | displaced_step_fixup (ptid_t event_ptid, enum target_signal signal) | |
1416 | { | |
1417 | struct cleanup *old_cleanups; | |
fc1cf338 PA |
1418 | struct displaced_step_inferior_state *displaced |
1419 | = get_displaced_stepping_state (ptid_get_pid (event_ptid)); | |
1420 | ||
1421 | /* Was any thread of this process doing a displaced step? */ | |
1422 | if (displaced == NULL) | |
1423 | return; | |
237fc4c9 PA |
1424 | |
1425 | /* Was this event for the pid we displaced? */ | |
fc1cf338 PA |
1426 | if (ptid_equal (displaced->step_ptid, null_ptid) |
1427 | || ! ptid_equal (displaced->step_ptid, event_ptid)) | |
237fc4c9 PA |
1428 | return; |
1429 | ||
fc1cf338 | 1430 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 | 1431 | |
e2d96639 | 1432 | displaced_step_restore (displaced, displaced->step_ptid); |
237fc4c9 PA |
1433 | |
1434 | /* Did the instruction complete successfully? */ | |
1435 | if (signal == TARGET_SIGNAL_TRAP) | |
1436 | { | |
1437 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
1438 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
1439 | displaced->step_closure, | |
1440 | displaced->step_original, | |
1441 | displaced->step_copy, | |
1442 | get_thread_regcache (displaced->step_ptid)); | |
237fc4c9 PA |
1443 | } |
1444 | else | |
1445 | { | |
1446 | /* Since the instruction didn't complete, all we can do is | |
1447 | relocate the PC. */ | |
515630c5 UW |
1448 | struct regcache *regcache = get_thread_regcache (event_ptid); |
1449 | CORE_ADDR pc = regcache_read_pc (regcache); | |
abbb1732 | 1450 | |
fc1cf338 | 1451 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1452 | regcache_write_pc (regcache, pc); |
237fc4c9 PA |
1453 | } |
1454 | ||
1455 | do_cleanups (old_cleanups); | |
1456 | ||
fc1cf338 | 1457 | displaced->step_ptid = null_ptid; |
1c5cfe86 | 1458 | |
237fc4c9 | 1459 | /* Are there any pending displaced stepping requests? If so, run |
fc1cf338 PA |
1460 | one now. Leave the state object around, since we're likely to |
1461 | need it again soon. */ | |
1462 | while (displaced->step_request_queue) | |
237fc4c9 PA |
1463 | { |
1464 | struct displaced_step_request *head; | |
1465 | ptid_t ptid; | |
5af949e3 | 1466 | struct regcache *regcache; |
929dfd4f | 1467 | struct gdbarch *gdbarch; |
1c5cfe86 | 1468 | CORE_ADDR actual_pc; |
6c95b8df | 1469 | struct address_space *aspace; |
237fc4c9 | 1470 | |
fc1cf338 | 1471 | head = displaced->step_request_queue; |
237fc4c9 | 1472 | ptid = head->ptid; |
fc1cf338 | 1473 | displaced->step_request_queue = head->next; |
237fc4c9 PA |
1474 | xfree (head); |
1475 | ||
ad53cd71 PA |
1476 | context_switch (ptid); |
1477 | ||
5af949e3 UW |
1478 | regcache = get_thread_regcache (ptid); |
1479 | actual_pc = regcache_read_pc (regcache); | |
6c95b8df | 1480 | aspace = get_regcache_aspace (regcache); |
1c5cfe86 | 1481 | |
6c95b8df | 1482 | if (breakpoint_here_p (aspace, actual_pc)) |
ad53cd71 | 1483 | { |
1c5cfe86 PA |
1484 | if (debug_displaced) |
1485 | fprintf_unfiltered (gdb_stdlog, | |
1486 | "displaced: stepping queued %s now\n", | |
1487 | target_pid_to_str (ptid)); | |
1488 | ||
1489 | displaced_step_prepare (ptid); | |
1490 | ||
929dfd4f JB |
1491 | gdbarch = get_regcache_arch (regcache); |
1492 | ||
1c5cfe86 PA |
1493 | if (debug_displaced) |
1494 | { | |
929dfd4f | 1495 | CORE_ADDR actual_pc = regcache_read_pc (regcache); |
1c5cfe86 PA |
1496 | gdb_byte buf[4]; |
1497 | ||
5af949e3 UW |
1498 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", |
1499 | paddress (gdbarch, actual_pc)); | |
1c5cfe86 PA |
1500 | read_memory (actual_pc, buf, sizeof (buf)); |
1501 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1502 | } | |
1503 | ||
fc1cf338 PA |
1504 | if (gdbarch_displaced_step_hw_singlestep (gdbarch, |
1505 | displaced->step_closure)) | |
929dfd4f | 1506 | target_resume (ptid, 1, TARGET_SIGNAL_0); |
99e40580 UW |
1507 | else |
1508 | target_resume (ptid, 0, TARGET_SIGNAL_0); | |
1c5cfe86 PA |
1509 | |
1510 | /* Done, we're stepping a thread. */ | |
1511 | break; | |
ad53cd71 | 1512 | } |
1c5cfe86 PA |
1513 | else |
1514 | { | |
1515 | int step; | |
1516 | struct thread_info *tp = inferior_thread (); | |
1517 | ||
1518 | /* The breakpoint we were sitting under has since been | |
1519 | removed. */ | |
16c381f0 | 1520 | tp->control.trap_expected = 0; |
1c5cfe86 PA |
1521 | |
1522 | /* Go back to what we were trying to do. */ | |
1523 | step = currently_stepping (tp); | |
ad53cd71 | 1524 | |
1c5cfe86 | 1525 | if (debug_displaced) |
3e43a32a MS |
1526 | fprintf_unfiltered (gdb_stdlog, |
1527 | "breakpoint is gone %s: step(%d)\n", | |
1c5cfe86 PA |
1528 | target_pid_to_str (tp->ptid), step); |
1529 | ||
1530 | target_resume (ptid, step, TARGET_SIGNAL_0); | |
16c381f0 | 1531 | tp->suspend.stop_signal = TARGET_SIGNAL_0; |
1c5cfe86 PA |
1532 | |
1533 | /* This request was discarded. See if there's any other | |
1534 | thread waiting for its turn. */ | |
1535 | } | |
237fc4c9 PA |
1536 | } |
1537 | } | |
1538 | ||
5231c1fd PA |
1539 | /* Update global variables holding ptids to hold NEW_PTID if they were |
1540 | holding OLD_PTID. */ | |
1541 | static void | |
1542 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
1543 | { | |
1544 | struct displaced_step_request *it; | |
fc1cf338 | 1545 | struct displaced_step_inferior_state *displaced; |
5231c1fd PA |
1546 | |
1547 | if (ptid_equal (inferior_ptid, old_ptid)) | |
1548 | inferior_ptid = new_ptid; | |
1549 | ||
1550 | if (ptid_equal (singlestep_ptid, old_ptid)) | |
1551 | singlestep_ptid = new_ptid; | |
1552 | ||
5231c1fd PA |
1553 | if (ptid_equal (deferred_step_ptid, old_ptid)) |
1554 | deferred_step_ptid = new_ptid; | |
1555 | ||
fc1cf338 PA |
1556 | for (displaced = displaced_step_inferior_states; |
1557 | displaced; | |
1558 | displaced = displaced->next) | |
1559 | { | |
1560 | if (ptid_equal (displaced->step_ptid, old_ptid)) | |
1561 | displaced->step_ptid = new_ptid; | |
1562 | ||
1563 | for (it = displaced->step_request_queue; it; it = it->next) | |
1564 | if (ptid_equal (it->ptid, old_ptid)) | |
1565 | it->ptid = new_ptid; | |
1566 | } | |
5231c1fd PA |
1567 | } |
1568 | ||
237fc4c9 PA |
1569 | \f |
1570 | /* Resuming. */ | |
c906108c SS |
1571 | |
1572 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 1573 | static void |
74b7792f | 1574 | resume_cleanups (void *ignore) |
c906108c SS |
1575 | { |
1576 | normal_stop (); | |
1577 | } | |
1578 | ||
53904c9e AC |
1579 | static const char schedlock_off[] = "off"; |
1580 | static const char schedlock_on[] = "on"; | |
1581 | static const char schedlock_step[] = "step"; | |
40478521 | 1582 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
1583 | schedlock_off, |
1584 | schedlock_on, | |
1585 | schedlock_step, | |
1586 | NULL | |
1587 | }; | |
920d2a44 AC |
1588 | static const char *scheduler_mode = schedlock_off; |
1589 | static void | |
1590 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
1591 | struct cmd_list_element *c, const char *value) | |
1592 | { | |
3e43a32a MS |
1593 | fprintf_filtered (file, |
1594 | _("Mode for locking scheduler " | |
1595 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
1596 | value); |
1597 | } | |
c906108c SS |
1598 | |
1599 | static void | |
96baa820 | 1600 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 1601 | { |
eefe576e AC |
1602 | if (!target_can_lock_scheduler) |
1603 | { | |
1604 | scheduler_mode = schedlock_off; | |
1605 | error (_("Target '%s' cannot support this command."), target_shortname); | |
1606 | } | |
c906108c SS |
1607 | } |
1608 | ||
d4db2f36 PA |
1609 | /* True if execution commands resume all threads of all processes by |
1610 | default; otherwise, resume only threads of the current inferior | |
1611 | process. */ | |
1612 | int sched_multi = 0; | |
1613 | ||
2facfe5c DD |
1614 | /* Try to setup for software single stepping over the specified location. |
1615 | Return 1 if target_resume() should use hardware single step. | |
1616 | ||
1617 | GDBARCH the current gdbarch. | |
1618 | PC the location to step over. */ | |
1619 | ||
1620 | static int | |
1621 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1622 | { | |
1623 | int hw_step = 1; | |
1624 | ||
f02253f1 HZ |
1625 | if (execution_direction == EXEC_FORWARD |
1626 | && gdbarch_software_single_step_p (gdbarch) | |
99e40580 | 1627 | && gdbarch_software_single_step (gdbarch, get_current_frame ())) |
2facfe5c | 1628 | { |
99e40580 UW |
1629 | hw_step = 0; |
1630 | /* Do not pull these breakpoints until after a `wait' in | |
1777feb0 | 1631 | `wait_for_inferior'. */ |
99e40580 UW |
1632 | singlestep_breakpoints_inserted_p = 1; |
1633 | singlestep_ptid = inferior_ptid; | |
1634 | singlestep_pc = pc; | |
2facfe5c DD |
1635 | } |
1636 | return hw_step; | |
1637 | } | |
c906108c | 1638 | |
09cee04b PA |
1639 | /* Return a ptid representing the set of threads that we will proceed, |
1640 | in the perspective of the user/frontend. We may actually resume | |
1641 | fewer threads at first, e.g., if a thread is stopped at a | |
b136cd05 PA |
1642 | breakpoint that needs stepping-off, but that should not be visible |
1643 | to the user/frontend, and neither should the frontend/user be | |
1644 | allowed to proceed any of the threads that happen to be stopped for | |
09cee04b PA |
1645 | internal run control handling, if a previous command wanted them |
1646 | resumed. */ | |
1647 | ||
1648 | ptid_t | |
1649 | user_visible_resume_ptid (int step) | |
1650 | { | |
1651 | /* By default, resume all threads of all processes. */ | |
1652 | ptid_t resume_ptid = RESUME_ALL; | |
1653 | ||
1654 | /* Maybe resume only all threads of the current process. */ | |
1655 | if (!sched_multi && target_supports_multi_process ()) | |
1656 | { | |
1657 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
1658 | } | |
1659 | ||
1660 | /* Maybe resume a single thread after all. */ | |
1661 | if (non_stop) | |
1662 | { | |
1663 | /* With non-stop mode on, threads are always handled | |
1664 | individually. */ | |
1665 | resume_ptid = inferior_ptid; | |
1666 | } | |
1667 | else if ((scheduler_mode == schedlock_on) | |
1668 | || (scheduler_mode == schedlock_step | |
1669 | && (step || singlestep_breakpoints_inserted_p))) | |
1670 | { | |
1671 | /* User-settable 'scheduler' mode requires solo thread resume. */ | |
1672 | resume_ptid = inferior_ptid; | |
1673 | } | |
1674 | ||
1675 | return resume_ptid; | |
1676 | } | |
1677 | ||
c906108c SS |
1678 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
1679 | wants to interrupt some lengthy single-stepping operation | |
1680 | (for child processes, the SIGINT goes to the inferior, and so | |
1681 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
1682 | other targets, that's not true). | |
1683 | ||
1684 | STEP nonzero if we should step (zero to continue instead). | |
1685 | SIG is the signal to give the inferior (zero for none). */ | |
1686 | void | |
96baa820 | 1687 | resume (int step, enum target_signal sig) |
c906108c SS |
1688 | { |
1689 | int should_resume = 1; | |
74b7792f | 1690 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
1691 | struct regcache *regcache = get_current_regcache (); |
1692 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4e1c45ea | 1693 | struct thread_info *tp = inferior_thread (); |
515630c5 | 1694 | CORE_ADDR pc = regcache_read_pc (regcache); |
6c95b8df | 1695 | struct address_space *aspace = get_regcache_aspace (regcache); |
c7e8a53c | 1696 | |
c906108c SS |
1697 | QUIT; |
1698 | ||
74609e71 YQ |
1699 | if (current_inferior ()->waiting_for_vfork_done) |
1700 | { | |
48f9886d PA |
1701 | /* Don't try to single-step a vfork parent that is waiting for |
1702 | the child to get out of the shared memory region (by exec'ing | |
1703 | or exiting). This is particularly important on software | |
1704 | single-step archs, as the child process would trip on the | |
1705 | software single step breakpoint inserted for the parent | |
1706 | process. Since the parent will not actually execute any | |
1707 | instruction until the child is out of the shared region (such | |
1708 | are vfork's semantics), it is safe to simply continue it. | |
1709 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
1710 | the parent, and tell it to `keep_going', which automatically | |
1711 | re-sets it stepping. */ | |
74609e71 YQ |
1712 | if (debug_infrun) |
1713 | fprintf_unfiltered (gdb_stdlog, | |
1714 | "infrun: resume : clear step\n"); | |
1715 | step = 0; | |
1716 | } | |
1717 | ||
527159b7 | 1718 | if (debug_infrun) |
237fc4c9 PA |
1719 | fprintf_unfiltered (gdb_stdlog, |
1720 | "infrun: resume (step=%d, signal=%d), " | |
0d9a9a5f PA |
1721 | "trap_expected=%d, current thread [%s] at %s\n", |
1722 | step, sig, tp->control.trap_expected, | |
1723 | target_pid_to_str (inferior_ptid), | |
1724 | paddress (gdbarch, pc)); | |
c906108c | 1725 | |
c2c6d25f JM |
1726 | /* Normally, by the time we reach `resume', the breakpoints are either |
1727 | removed or inserted, as appropriate. The exception is if we're sitting | |
1728 | at a permanent breakpoint; we need to step over it, but permanent | |
1729 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 1730 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 1731 | { |
515630c5 UW |
1732 | if (gdbarch_skip_permanent_breakpoint_p (gdbarch)) |
1733 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
6d350bb5 | 1734 | else |
ac74f770 MS |
1735 | error (_("\ |
1736 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
1737 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
1738 | a command like `return' or `jump' to continue execution.")); | |
6d350bb5 | 1739 | } |
c2c6d25f | 1740 | |
237fc4c9 PA |
1741 | /* If enabled, step over breakpoints by executing a copy of the |
1742 | instruction at a different address. | |
1743 | ||
1744 | We can't use displaced stepping when we have a signal to deliver; | |
1745 | the comments for displaced_step_prepare explain why. The | |
1746 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
1747 | signals' explain what we do instead. |
1748 | ||
1749 | We can't use displaced stepping when we are waiting for vfork_done | |
1750 | event, displaced stepping breaks the vfork child similarly as single | |
1751 | step software breakpoint. */ | |
515630c5 | 1752 | if (use_displaced_stepping (gdbarch) |
16c381f0 | 1753 | && (tp->control.trap_expected |
929dfd4f | 1754 | || (step && gdbarch_software_single_step_p (gdbarch))) |
74609e71 YQ |
1755 | && sig == TARGET_SIGNAL_0 |
1756 | && !current_inferior ()->waiting_for_vfork_done) | |
237fc4c9 | 1757 | { |
fc1cf338 PA |
1758 | struct displaced_step_inferior_state *displaced; |
1759 | ||
237fc4c9 | 1760 | if (!displaced_step_prepare (inferior_ptid)) |
d56b7306 VP |
1761 | { |
1762 | /* Got placed in displaced stepping queue. Will be resumed | |
1763 | later when all the currently queued displaced stepping | |
7f7efbd9 VP |
1764 | requests finish. The thread is not executing at this point, |
1765 | and the call to set_executing will be made later. But we | |
1766 | need to call set_running here, since from frontend point of view, | |
1767 | the thread is running. */ | |
1768 | set_running (inferior_ptid, 1); | |
d56b7306 VP |
1769 | discard_cleanups (old_cleanups); |
1770 | return; | |
1771 | } | |
99e40580 | 1772 | |
fc1cf338 PA |
1773 | displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); |
1774 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, | |
1775 | displaced->step_closure); | |
237fc4c9 PA |
1776 | } |
1777 | ||
2facfe5c | 1778 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 1779 | else if (step) |
2facfe5c | 1780 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 1781 | |
30852783 UW |
1782 | /* Currently, our software single-step implementation leads to different |
1783 | results than hardware single-stepping in one situation: when stepping | |
1784 | into delivering a signal which has an associated signal handler, | |
1785 | hardware single-step will stop at the first instruction of the handler, | |
1786 | while software single-step will simply skip execution of the handler. | |
1787 | ||
1788 | For now, this difference in behavior is accepted since there is no | |
1789 | easy way to actually implement single-stepping into a signal handler | |
1790 | without kernel support. | |
1791 | ||
1792 | However, there is one scenario where this difference leads to follow-on | |
1793 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
1794 | and then single-stepping. In this case, the software single-step | |
1795 | behavior means that even if there is a *breakpoint* in the signal | |
1796 | handler, GDB still would not stop. | |
1797 | ||
1798 | Fortunately, we can at least fix this particular issue. We detect | |
1799 | here the case where we are about to deliver a signal while software | |
1800 | single-stepping with breakpoints removed. In this situation, we | |
1801 | revert the decisions to remove all breakpoints and insert single- | |
1802 | step breakpoints, and instead we install a step-resume breakpoint | |
1803 | at the current address, deliver the signal without stepping, and | |
1804 | once we arrive back at the step-resume breakpoint, actually step | |
1805 | over the breakpoint we originally wanted to step over. */ | |
1806 | if (singlestep_breakpoints_inserted_p | |
1807 | && tp->control.trap_expected && sig != TARGET_SIGNAL_0) | |
1808 | { | |
1809 | /* If we have nested signals or a pending signal is delivered | |
1810 | immediately after a handler returns, might might already have | |
1811 | a step-resume breakpoint set on the earlier handler. We cannot | |
1812 | set another step-resume breakpoint; just continue on until the | |
1813 | original breakpoint is hit. */ | |
1814 | if (tp->control.step_resume_breakpoint == NULL) | |
1815 | { | |
2c03e5be | 1816 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
1817 | tp->step_after_step_resume_breakpoint = 1; |
1818 | } | |
1819 | ||
1820 | remove_single_step_breakpoints (); | |
1821 | singlestep_breakpoints_inserted_p = 0; | |
1822 | ||
1823 | insert_breakpoints (); | |
1824 | tp->control.trap_expected = 0; | |
1825 | } | |
1826 | ||
c906108c SS |
1827 | if (should_resume) |
1828 | { | |
39f77062 | 1829 | ptid_t resume_ptid; |
dfcd3bfb | 1830 | |
cd76b0b7 VP |
1831 | /* If STEP is set, it's a request to use hardware stepping |
1832 | facilities. But in that case, we should never | |
1833 | use singlestep breakpoint. */ | |
1834 | gdb_assert (!(singlestep_breakpoints_inserted_p && step)); | |
1835 | ||
d4db2f36 PA |
1836 | /* Decide the set of threads to ask the target to resume. Start |
1837 | by assuming everything will be resumed, than narrow the set | |
1838 | by applying increasingly restricting conditions. */ | |
09cee04b | 1839 | resume_ptid = user_visible_resume_ptid (step); |
d4db2f36 PA |
1840 | |
1841 | /* Maybe resume a single thread after all. */ | |
cd76b0b7 VP |
1842 | if (singlestep_breakpoints_inserted_p |
1843 | && stepping_past_singlestep_breakpoint) | |
c906108c | 1844 | { |
cd76b0b7 VP |
1845 | /* The situation here is as follows. In thread T1 we wanted to |
1846 | single-step. Lacking hardware single-stepping we've | |
1847 | set breakpoint at the PC of the next instruction -- call it | |
1848 | P. After resuming, we've hit that breakpoint in thread T2. | |
1849 | Now we've removed original breakpoint, inserted breakpoint | |
1850 | at P+1, and try to step to advance T2 past breakpoint. | |
1851 | We need to step only T2, as if T1 is allowed to freely run, | |
1852 | it can run past P, and if other threads are allowed to run, | |
1853 | they can hit breakpoint at P+1, and nested hits of single-step | |
1854 | breakpoints is not something we'd want -- that's complicated | |
1855 | to support, and has no value. */ | |
1856 | resume_ptid = inferior_ptid; | |
1857 | } | |
d4db2f36 | 1858 | else if ((step || singlestep_breakpoints_inserted_p) |
16c381f0 | 1859 | && tp->control.trap_expected) |
cd76b0b7 | 1860 | { |
74960c60 VP |
1861 | /* We're allowing a thread to run past a breakpoint it has |
1862 | hit, by single-stepping the thread with the breakpoint | |
1863 | removed. In which case, we need to single-step only this | |
1864 | thread, and keep others stopped, as they can miss this | |
1865 | breakpoint if allowed to run. | |
1866 | ||
1867 | The current code actually removes all breakpoints when | |
1868 | doing this, not just the one being stepped over, so if we | |
1869 | let other threads run, we can actually miss any | |
1870 | breakpoint, not just the one at PC. */ | |
ef5cf84e | 1871 | resume_ptid = inferior_ptid; |
c906108c | 1872 | } |
ef5cf84e | 1873 | |
515630c5 | 1874 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4ed33b9 AC |
1875 | { |
1876 | /* Most targets can step a breakpoint instruction, thus | |
1877 | executing it normally. But if this one cannot, just | |
1878 | continue and we will hit it anyway. */ | |
6c95b8df | 1879 | if (step && breakpoint_inserted_here_p (aspace, pc)) |
c4ed33b9 AC |
1880 | step = 0; |
1881 | } | |
237fc4c9 PA |
1882 | |
1883 | if (debug_displaced | |
515630c5 | 1884 | && use_displaced_stepping (gdbarch) |
16c381f0 | 1885 | && tp->control.trap_expected) |
237fc4c9 | 1886 | { |
515630c5 | 1887 | struct regcache *resume_regcache = get_thread_regcache (resume_ptid); |
5af949e3 | 1888 | struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache); |
515630c5 | 1889 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
237fc4c9 PA |
1890 | gdb_byte buf[4]; |
1891 | ||
5af949e3 UW |
1892 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", |
1893 | paddress (resume_gdbarch, actual_pc)); | |
237fc4c9 PA |
1894 | read_memory (actual_pc, buf, sizeof (buf)); |
1895 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1896 | } | |
1897 | ||
e58b0e63 PA |
1898 | /* Install inferior's terminal modes. */ |
1899 | target_terminal_inferior (); | |
1900 | ||
2020b7ab PA |
1901 | /* Avoid confusing the next resume, if the next stop/resume |
1902 | happens to apply to another thread. */ | |
16c381f0 | 1903 | tp->suspend.stop_signal = TARGET_SIGNAL_0; |
607cecd2 | 1904 | |
2455069d UW |
1905 | /* Advise target which signals may be handled silently. If we have |
1906 | removed breakpoints because we are stepping over one (which can | |
1907 | happen only if we are not using displaced stepping), we need to | |
1908 | receive all signals to avoid accidentally skipping a breakpoint | |
1909 | during execution of a signal handler. */ | |
1910 | if ((step || singlestep_breakpoints_inserted_p) | |
1911 | && tp->control.trap_expected | |
1912 | && !use_displaced_stepping (gdbarch)) | |
1913 | target_pass_signals (0, NULL); | |
1914 | else | |
1915 | target_pass_signals ((int) TARGET_SIGNAL_LAST, signal_pass); | |
1916 | ||
607cecd2 | 1917 | target_resume (resume_ptid, step, sig); |
c906108c SS |
1918 | } |
1919 | ||
1920 | discard_cleanups (old_cleanups); | |
1921 | } | |
1922 | \f | |
237fc4c9 | 1923 | /* Proceeding. */ |
c906108c SS |
1924 | |
1925 | /* Clear out all variables saying what to do when inferior is continued. | |
1926 | First do this, then set the ones you want, then call `proceed'. */ | |
1927 | ||
a7212384 UW |
1928 | static void |
1929 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 1930 | { |
a7212384 UW |
1931 | if (debug_infrun) |
1932 | fprintf_unfiltered (gdb_stdlog, | |
1933 | "infrun: clear_proceed_status_thread (%s)\n", | |
1934 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 1935 | |
16c381f0 JK |
1936 | tp->control.trap_expected = 0; |
1937 | tp->control.step_range_start = 0; | |
1938 | tp->control.step_range_end = 0; | |
1939 | tp->control.step_frame_id = null_frame_id; | |
1940 | tp->control.step_stack_frame_id = null_frame_id; | |
1941 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
a7212384 | 1942 | tp->stop_requested = 0; |
4e1c45ea | 1943 | |
16c381f0 | 1944 | tp->control.stop_step = 0; |
32400beb | 1945 | |
16c381f0 | 1946 | tp->control.proceed_to_finish = 0; |
414c69f7 | 1947 | |
a7212384 | 1948 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 1949 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 1950 | } |
32400beb | 1951 | |
a7212384 UW |
1952 | static int |
1953 | clear_proceed_status_callback (struct thread_info *tp, void *data) | |
1954 | { | |
1955 | if (is_exited (tp->ptid)) | |
1956 | return 0; | |
d6b48e9c | 1957 | |
a7212384 UW |
1958 | clear_proceed_status_thread (tp); |
1959 | return 0; | |
1960 | } | |
1961 | ||
1962 | void | |
1963 | clear_proceed_status (void) | |
1964 | { | |
6c95b8df PA |
1965 | if (!non_stop) |
1966 | { | |
1967 | /* In all-stop mode, delete the per-thread status of all | |
1968 | threads, even if inferior_ptid is null_ptid, there may be | |
1969 | threads on the list. E.g., we may be launching a new | |
1970 | process, while selecting the executable. */ | |
1971 | iterate_over_threads (clear_proceed_status_callback, NULL); | |
1972 | } | |
1973 | ||
a7212384 UW |
1974 | if (!ptid_equal (inferior_ptid, null_ptid)) |
1975 | { | |
1976 | struct inferior *inferior; | |
1977 | ||
1978 | if (non_stop) | |
1979 | { | |
6c95b8df PA |
1980 | /* If in non-stop mode, only delete the per-thread status of |
1981 | the current thread. */ | |
a7212384 UW |
1982 | clear_proceed_status_thread (inferior_thread ()); |
1983 | } | |
6c95b8df | 1984 | |
d6b48e9c | 1985 | inferior = current_inferior (); |
16c381f0 | 1986 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
1987 | } |
1988 | ||
c906108c | 1989 | stop_after_trap = 0; |
f3b1572e PA |
1990 | |
1991 | observer_notify_about_to_proceed (); | |
c906108c | 1992 | |
d5c31457 UW |
1993 | if (stop_registers) |
1994 | { | |
1995 | regcache_xfree (stop_registers); | |
1996 | stop_registers = NULL; | |
1997 | } | |
c906108c SS |
1998 | } |
1999 | ||
5a437975 DE |
2000 | /* Check the current thread against the thread that reported the most recent |
2001 | event. If a step-over is required return TRUE and set the current thread | |
2002 | to the old thread. Otherwise return FALSE. | |
2003 | ||
1777feb0 | 2004 | This should be suitable for any targets that support threads. */ |
ea67f13b DJ |
2005 | |
2006 | static int | |
6a6b96b9 | 2007 | prepare_to_proceed (int step) |
ea67f13b DJ |
2008 | { |
2009 | ptid_t wait_ptid; | |
2010 | struct target_waitstatus wait_status; | |
5a437975 DE |
2011 | int schedlock_enabled; |
2012 | ||
2013 | /* With non-stop mode on, threads are always handled individually. */ | |
2014 | gdb_assert (! non_stop); | |
ea67f13b DJ |
2015 | |
2016 | /* Get the last target status returned by target_wait(). */ | |
2017 | get_last_target_status (&wait_ptid, &wait_status); | |
2018 | ||
6a6b96b9 | 2019 | /* Make sure we were stopped at a breakpoint. */ |
ea67f13b | 2020 | if (wait_status.kind != TARGET_WAITKIND_STOPPED |
2b009048 DJ |
2021 | || (wait_status.value.sig != TARGET_SIGNAL_TRAP |
2022 | && wait_status.value.sig != TARGET_SIGNAL_ILL | |
2023 | && wait_status.value.sig != TARGET_SIGNAL_SEGV | |
2024 | && wait_status.value.sig != TARGET_SIGNAL_EMT)) | |
ea67f13b DJ |
2025 | { |
2026 | return 0; | |
2027 | } | |
2028 | ||
5a437975 DE |
2029 | schedlock_enabled = (scheduler_mode == schedlock_on |
2030 | || (scheduler_mode == schedlock_step | |
2031 | && step)); | |
2032 | ||
d4db2f36 PA |
2033 | /* Don't switch over to WAIT_PTID if scheduler locking is on. */ |
2034 | if (schedlock_enabled) | |
2035 | return 0; | |
2036 | ||
2037 | /* Don't switch over if we're about to resume some other process | |
2038 | other than WAIT_PTID's, and schedule-multiple is off. */ | |
2039 | if (!sched_multi | |
2040 | && ptid_get_pid (wait_ptid) != ptid_get_pid (inferior_ptid)) | |
2041 | return 0; | |
2042 | ||
6a6b96b9 | 2043 | /* Switched over from WAIT_PID. */ |
ea67f13b | 2044 | if (!ptid_equal (wait_ptid, minus_one_ptid) |
d4db2f36 | 2045 | && !ptid_equal (inferior_ptid, wait_ptid)) |
ea67f13b | 2046 | { |
515630c5 UW |
2047 | struct regcache *regcache = get_thread_regcache (wait_ptid); |
2048 | ||
6c95b8df PA |
2049 | if (breakpoint_here_p (get_regcache_aspace (regcache), |
2050 | regcache_read_pc (regcache))) | |
ea67f13b | 2051 | { |
515630c5 UW |
2052 | /* If stepping, remember current thread to switch back to. */ |
2053 | if (step) | |
2054 | deferred_step_ptid = inferior_ptid; | |
ea67f13b | 2055 | |
515630c5 UW |
2056 | /* Switch back to WAIT_PID thread. */ |
2057 | switch_to_thread (wait_ptid); | |
6a6b96b9 | 2058 | |
0d9a9a5f PA |
2059 | if (debug_infrun) |
2060 | fprintf_unfiltered (gdb_stdlog, | |
2061 | "infrun: prepare_to_proceed (step=%d), " | |
2062 | "switched to [%s]\n", | |
2063 | step, target_pid_to_str (inferior_ptid)); | |
2064 | ||
515630c5 UW |
2065 | /* We return 1 to indicate that there is a breakpoint here, |
2066 | so we need to step over it before continuing to avoid | |
1777feb0 | 2067 | hitting it straight away. */ |
515630c5 UW |
2068 | return 1; |
2069 | } | |
ea67f13b DJ |
2070 | } |
2071 | ||
2072 | return 0; | |
ea67f13b | 2073 | } |
e4846b08 | 2074 | |
c906108c SS |
2075 | /* Basic routine for continuing the program in various fashions. |
2076 | ||
2077 | ADDR is the address to resume at, or -1 for resume where stopped. | |
2078 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 2079 | or -1 for act according to how it stopped. |
c906108c | 2080 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
2081 | -1 means return after that and print nothing. |
2082 | You should probably set various step_... variables | |
2083 | before calling here, if you are stepping. | |
c906108c SS |
2084 | |
2085 | You should call clear_proceed_status before calling proceed. */ | |
2086 | ||
2087 | void | |
96baa820 | 2088 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c | 2089 | { |
e58b0e63 PA |
2090 | struct regcache *regcache; |
2091 | struct gdbarch *gdbarch; | |
4e1c45ea | 2092 | struct thread_info *tp; |
e58b0e63 | 2093 | CORE_ADDR pc; |
6c95b8df | 2094 | struct address_space *aspace; |
c906108c SS |
2095 | int oneproc = 0; |
2096 | ||
e58b0e63 PA |
2097 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2098 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2099 | resuming the current thread. */ | |
2100 | if (!follow_fork ()) | |
2101 | { | |
2102 | /* The target for some reason decided not to resume. */ | |
2103 | normal_stop (); | |
f148b27e PA |
2104 | if (target_can_async_p ()) |
2105 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2106 | return; |
2107 | } | |
2108 | ||
842951eb PA |
2109 | /* We'll update this if & when we switch to a new thread. */ |
2110 | previous_inferior_ptid = inferior_ptid; | |
2111 | ||
e58b0e63 PA |
2112 | regcache = get_current_regcache (); |
2113 | gdbarch = get_regcache_arch (regcache); | |
6c95b8df | 2114 | aspace = get_regcache_aspace (regcache); |
e58b0e63 PA |
2115 | pc = regcache_read_pc (regcache); |
2116 | ||
c906108c | 2117 | if (step > 0) |
515630c5 | 2118 | step_start_function = find_pc_function (pc); |
c906108c SS |
2119 | if (step < 0) |
2120 | stop_after_trap = 1; | |
2121 | ||
2acceee2 | 2122 | if (addr == (CORE_ADDR) -1) |
c906108c | 2123 | { |
6c95b8df | 2124 | if (pc == stop_pc && breakpoint_here_p (aspace, pc) |
b2175913 | 2125 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2126 | /* There is a breakpoint at the address we will resume at, |
2127 | step one instruction before inserting breakpoints so that | |
2128 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2129 | breakpoint). |
2130 | ||
2131 | Note, we don't do this in reverse, because we won't | |
2132 | actually be executing the breakpoint insn anyway. | |
2133 | We'll be (un-)executing the previous instruction. */ | |
2134 | ||
c906108c | 2135 | oneproc = 1; |
515630c5 UW |
2136 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2137 | && gdbarch_single_step_through_delay (gdbarch, | |
2138 | get_current_frame ())) | |
3352ef37 AC |
2139 | /* We stepped onto an instruction that needs to be stepped |
2140 | again before re-inserting the breakpoint, do so. */ | |
c906108c SS |
2141 | oneproc = 1; |
2142 | } | |
2143 | else | |
2144 | { | |
515630c5 | 2145 | regcache_write_pc (regcache, addr); |
c906108c SS |
2146 | } |
2147 | ||
527159b7 | 2148 | if (debug_infrun) |
8a9de0e4 | 2149 | fprintf_unfiltered (gdb_stdlog, |
5af949e3 UW |
2150 | "infrun: proceed (addr=%s, signal=%d, step=%d)\n", |
2151 | paddress (gdbarch, addr), siggnal, step); | |
527159b7 | 2152 | |
94cc34af PA |
2153 | if (non_stop) |
2154 | /* In non-stop, each thread is handled individually. The context | |
2155 | must already be set to the right thread here. */ | |
2156 | ; | |
2157 | else | |
2158 | { | |
2159 | /* In a multi-threaded task we may select another thread and | |
2160 | then continue or step. | |
c906108c | 2161 | |
94cc34af PA |
2162 | But if the old thread was stopped at a breakpoint, it will |
2163 | immediately cause another breakpoint stop without any | |
2164 | execution (i.e. it will report a breakpoint hit incorrectly). | |
2165 | So we must step over it first. | |
c906108c | 2166 | |
94cc34af PA |
2167 | prepare_to_proceed checks the current thread against the |
2168 | thread that reported the most recent event. If a step-over | |
2169 | is required it returns TRUE and sets the current thread to | |
1777feb0 | 2170 | the old thread. */ |
94cc34af PA |
2171 | if (prepare_to_proceed (step)) |
2172 | oneproc = 1; | |
2173 | } | |
c906108c | 2174 | |
4e1c45ea PA |
2175 | /* prepare_to_proceed may change the current thread. */ |
2176 | tp = inferior_thread (); | |
2177 | ||
30852783 UW |
2178 | if (oneproc) |
2179 | { | |
2180 | tp->control.trap_expected = 1; | |
2181 | /* If displaced stepping is enabled, we can step over the | |
2182 | breakpoint without hitting it, so leave all breakpoints | |
2183 | inserted. Otherwise we need to disable all breakpoints, step | |
2184 | one instruction, and then re-add them when that step is | |
2185 | finished. */ | |
2186 | if (!use_displaced_stepping (gdbarch)) | |
2187 | remove_breakpoints (); | |
2188 | } | |
2189 | ||
2190 | /* We can insert breakpoints if we're not trying to step over one, | |
2191 | or if we are stepping over one but we're using displaced stepping | |
2192 | to do so. */ | |
2193 | if (! tp->control.trap_expected || use_displaced_stepping (gdbarch)) | |
2194 | insert_breakpoints (); | |
2195 | ||
2020b7ab PA |
2196 | if (!non_stop) |
2197 | { | |
2198 | /* Pass the last stop signal to the thread we're resuming, | |
2199 | irrespective of whether the current thread is the thread that | |
2200 | got the last event or not. This was historically GDB's | |
2201 | behaviour before keeping a stop_signal per thread. */ | |
2202 | ||
2203 | struct thread_info *last_thread; | |
2204 | ptid_t last_ptid; | |
2205 | struct target_waitstatus last_status; | |
2206 | ||
2207 | get_last_target_status (&last_ptid, &last_status); | |
2208 | if (!ptid_equal (inferior_ptid, last_ptid) | |
2209 | && !ptid_equal (last_ptid, null_ptid) | |
2210 | && !ptid_equal (last_ptid, minus_one_ptid)) | |
2211 | { | |
e09875d4 | 2212 | last_thread = find_thread_ptid (last_ptid); |
2020b7ab PA |
2213 | if (last_thread) |
2214 | { | |
16c381f0 JK |
2215 | tp->suspend.stop_signal = last_thread->suspend.stop_signal; |
2216 | last_thread->suspend.stop_signal = TARGET_SIGNAL_0; | |
2020b7ab PA |
2217 | } |
2218 | } | |
2219 | } | |
2220 | ||
c906108c | 2221 | if (siggnal != TARGET_SIGNAL_DEFAULT) |
16c381f0 | 2222 | tp->suspend.stop_signal = siggnal; |
c906108c SS |
2223 | /* If this signal should not be seen by program, |
2224 | give it zero. Used for debugging signals. */ | |
16c381f0 JK |
2225 | else if (!signal_program[tp->suspend.stop_signal]) |
2226 | tp->suspend.stop_signal = TARGET_SIGNAL_0; | |
c906108c SS |
2227 | |
2228 | annotate_starting (); | |
2229 | ||
2230 | /* Make sure that output from GDB appears before output from the | |
2231 | inferior. */ | |
2232 | gdb_flush (gdb_stdout); | |
2233 | ||
e4846b08 JJ |
2234 | /* Refresh prev_pc value just prior to resuming. This used to be |
2235 | done in stop_stepping, however, setting prev_pc there did not handle | |
2236 | scenarios such as inferior function calls or returning from | |
2237 | a function via the return command. In those cases, the prev_pc | |
2238 | value was not set properly for subsequent commands. The prev_pc value | |
2239 | is used to initialize the starting line number in the ecs. With an | |
2240 | invalid value, the gdb next command ends up stopping at the position | |
2241 | represented by the next line table entry past our start position. | |
2242 | On platforms that generate one line table entry per line, this | |
2243 | is not a problem. However, on the ia64, the compiler generates | |
2244 | extraneous line table entries that do not increase the line number. | |
2245 | When we issue the gdb next command on the ia64 after an inferior call | |
2246 | or a return command, we often end up a few instructions forward, still | |
2247 | within the original line we started. | |
2248 | ||
d5cd6034 JB |
2249 | An attempt was made to refresh the prev_pc at the same time the |
2250 | execution_control_state is initialized (for instance, just before | |
2251 | waiting for an inferior event). But this approach did not work | |
2252 | because of platforms that use ptrace, where the pc register cannot | |
2253 | be read unless the inferior is stopped. At that point, we are not | |
2254 | guaranteed the inferior is stopped and so the regcache_read_pc() call | |
2255 | can fail. Setting the prev_pc value here ensures the value is updated | |
2256 | correctly when the inferior is stopped. */ | |
4e1c45ea | 2257 | tp->prev_pc = regcache_read_pc (get_current_regcache ()); |
e4846b08 | 2258 | |
59f0d5d9 | 2259 | /* Fill in with reasonable starting values. */ |
4e1c45ea | 2260 | init_thread_stepping_state (tp); |
59f0d5d9 | 2261 | |
59f0d5d9 PA |
2262 | /* Reset to normal state. */ |
2263 | init_infwait_state (); | |
2264 | ||
c906108c | 2265 | /* Resume inferior. */ |
16c381f0 | 2266 | resume (oneproc || step || bpstat_should_step (), tp->suspend.stop_signal); |
c906108c SS |
2267 | |
2268 | /* Wait for it to stop (if not standalone) | |
2269 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 | 2270 | /* Do this only if we are not using the event loop, or if the target |
1777feb0 | 2271 | does not support asynchronous execution. */ |
362646f5 | 2272 | if (!target_can_async_p ()) |
43ff13b4 | 2273 | { |
e4c8541f | 2274 | wait_for_inferior (); |
43ff13b4 JM |
2275 | normal_stop (); |
2276 | } | |
c906108c | 2277 | } |
c906108c SS |
2278 | \f |
2279 | ||
2280 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 2281 | |
c906108c | 2282 | void |
8621d6a9 | 2283 | start_remote (int from_tty) |
c906108c | 2284 | { |
d6b48e9c | 2285 | struct inferior *inferior; |
d6b48e9c PA |
2286 | |
2287 | inferior = current_inferior (); | |
16c381f0 | 2288 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; |
43ff13b4 | 2289 | |
1777feb0 | 2290 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 2291 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 2292 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
2293 | nothing is returned (instead of just blocking). Because of this, |
2294 | targets expecting an immediate response need to, internally, set | |
2295 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 2296 | timeout. */ |
6426a772 JM |
2297 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
2298 | differentiate to its caller what the state of the target is after | |
2299 | the initial open has been performed. Here we're assuming that | |
2300 | the target has stopped. It should be possible to eventually have | |
2301 | target_open() return to the caller an indication that the target | |
2302 | is currently running and GDB state should be set to the same as | |
1777feb0 | 2303 | for an async run. */ |
e4c8541f | 2304 | wait_for_inferior (); |
8621d6a9 DJ |
2305 | |
2306 | /* Now that the inferior has stopped, do any bookkeeping like | |
2307 | loading shared libraries. We want to do this before normal_stop, | |
2308 | so that the displayed frame is up to date. */ | |
2309 | post_create_inferior (¤t_target, from_tty); | |
2310 | ||
6426a772 | 2311 | normal_stop (); |
c906108c SS |
2312 | } |
2313 | ||
2314 | /* Initialize static vars when a new inferior begins. */ | |
2315 | ||
2316 | void | |
96baa820 | 2317 | init_wait_for_inferior (void) |
c906108c SS |
2318 | { |
2319 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 2320 | |
c906108c SS |
2321 | breakpoint_init_inferior (inf_starting); |
2322 | ||
c906108c | 2323 | clear_proceed_status (); |
9f976b41 DJ |
2324 | |
2325 | stepping_past_singlestep_breakpoint = 0; | |
ca67fcb8 | 2326 | deferred_step_ptid = null_ptid; |
ca005067 DJ |
2327 | |
2328 | target_last_wait_ptid = minus_one_ptid; | |
237fc4c9 | 2329 | |
842951eb | 2330 | previous_inferior_ptid = inferior_ptid; |
0d1e5fa7 PA |
2331 | init_infwait_state (); |
2332 | ||
edb3359d DJ |
2333 | /* Discard any skipped inlined frames. */ |
2334 | clear_inline_frame_state (minus_one_ptid); | |
c906108c | 2335 | } |
237fc4c9 | 2336 | |
c906108c | 2337 | \f |
b83266a0 SS |
2338 | /* This enum encodes possible reasons for doing a target_wait, so that |
2339 | wfi can call target_wait in one place. (Ultimately the call will be | |
2340 | moved out of the infinite loop entirely.) */ | |
2341 | ||
c5aa993b JM |
2342 | enum infwait_states |
2343 | { | |
cd0fc7c3 SS |
2344 | infwait_normal_state, |
2345 | infwait_thread_hop_state, | |
d983da9c | 2346 | infwait_step_watch_state, |
cd0fc7c3 | 2347 | infwait_nonstep_watch_state |
b83266a0 SS |
2348 | }; |
2349 | ||
0d1e5fa7 PA |
2350 | /* The PTID we'll do a target_wait on.*/ |
2351 | ptid_t waiton_ptid; | |
2352 | ||
2353 | /* Current inferior wait state. */ | |
2354 | enum infwait_states infwait_state; | |
cd0fc7c3 | 2355 | |
0d1e5fa7 PA |
2356 | /* Data to be passed around while handling an event. This data is |
2357 | discarded between events. */ | |
c5aa993b | 2358 | struct execution_control_state |
488f131b | 2359 | { |
0d1e5fa7 | 2360 | ptid_t ptid; |
4e1c45ea PA |
2361 | /* The thread that got the event, if this was a thread event; NULL |
2362 | otherwise. */ | |
2363 | struct thread_info *event_thread; | |
2364 | ||
488f131b | 2365 | struct target_waitstatus ws; |
488f131b | 2366 | int random_signal; |
7e324e48 | 2367 | int stop_func_filled_in; |
488f131b JB |
2368 | CORE_ADDR stop_func_start; |
2369 | CORE_ADDR stop_func_end; | |
2c02bd72 | 2370 | const char *stop_func_name; |
488f131b | 2371 | int new_thread_event; |
488f131b JB |
2372 | int wait_some_more; |
2373 | }; | |
2374 | ||
ec9499be | 2375 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 2376 | |
568d6575 UW |
2377 | static void handle_step_into_function (struct gdbarch *gdbarch, |
2378 | struct execution_control_state *ecs); | |
2379 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
2380 | struct execution_control_state *ecs); | |
186c406b TT |
2381 | static void check_exception_resume (struct execution_control_state *, |
2382 | struct frame_info *, struct symbol *); | |
611c83ae | 2383 | |
104c1213 JM |
2384 | static void stop_stepping (struct execution_control_state *ecs); |
2385 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 2386 | static void keep_going (struct execution_control_state *ecs); |
104c1213 | 2387 | |
252fbfc8 PA |
2388 | /* Callback for iterate over threads. If the thread is stopped, but |
2389 | the user/frontend doesn't know about that yet, go through | |
2390 | normal_stop, as if the thread had just stopped now. ARG points at | |
2391 | a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If | |
2392 | ptid_is_pid(PTID) is true, applies to all threads of the process | |
2393 | pointed at by PTID. Otherwise, apply only to the thread pointed by | |
2394 | PTID. */ | |
2395 | ||
2396 | static int | |
2397 | infrun_thread_stop_requested_callback (struct thread_info *info, void *arg) | |
2398 | { | |
2399 | ptid_t ptid = * (ptid_t *) arg; | |
2400 | ||
2401 | if ((ptid_equal (info->ptid, ptid) | |
2402 | || ptid_equal (minus_one_ptid, ptid) | |
2403 | || (ptid_is_pid (ptid) | |
2404 | && ptid_get_pid (ptid) == ptid_get_pid (info->ptid))) | |
2405 | && is_running (info->ptid) | |
2406 | && !is_executing (info->ptid)) | |
2407 | { | |
2408 | struct cleanup *old_chain; | |
2409 | struct execution_control_state ecss; | |
2410 | struct execution_control_state *ecs = &ecss; | |
2411 | ||
2412 | memset (ecs, 0, sizeof (*ecs)); | |
2413 | ||
2414 | old_chain = make_cleanup_restore_current_thread (); | |
2415 | ||
2416 | switch_to_thread (info->ptid); | |
2417 | ||
2418 | /* Go through handle_inferior_event/normal_stop, so we always | |
2419 | have consistent output as if the stop event had been | |
2420 | reported. */ | |
2421 | ecs->ptid = info->ptid; | |
e09875d4 | 2422 | ecs->event_thread = find_thread_ptid (info->ptid); |
252fbfc8 PA |
2423 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; |
2424 | ecs->ws.value.sig = TARGET_SIGNAL_0; | |
2425 | ||
2426 | handle_inferior_event (ecs); | |
2427 | ||
2428 | if (!ecs->wait_some_more) | |
2429 | { | |
2430 | struct thread_info *tp; | |
2431 | ||
2432 | normal_stop (); | |
2433 | ||
fa4cd53f | 2434 | /* Finish off the continuations. */ |
252fbfc8 | 2435 | tp = inferior_thread (); |
fa4cd53f PA |
2436 | do_all_intermediate_continuations_thread (tp, 1); |
2437 | do_all_continuations_thread (tp, 1); | |
252fbfc8 PA |
2438 | } |
2439 | ||
2440 | do_cleanups (old_chain); | |
2441 | } | |
2442 | ||
2443 | return 0; | |
2444 | } | |
2445 | ||
2446 | /* This function is attached as a "thread_stop_requested" observer. | |
2447 | Cleanup local state that assumed the PTID was to be resumed, and | |
2448 | report the stop to the frontend. */ | |
2449 | ||
2c0b251b | 2450 | static void |
252fbfc8 PA |
2451 | infrun_thread_stop_requested (ptid_t ptid) |
2452 | { | |
fc1cf338 | 2453 | struct displaced_step_inferior_state *displaced; |
252fbfc8 PA |
2454 | |
2455 | /* PTID was requested to stop. Remove it from the displaced | |
2456 | stepping queue, so we don't try to resume it automatically. */ | |
fc1cf338 PA |
2457 | |
2458 | for (displaced = displaced_step_inferior_states; | |
2459 | displaced; | |
2460 | displaced = displaced->next) | |
252fbfc8 | 2461 | { |
fc1cf338 | 2462 | struct displaced_step_request *it, **prev_next_p; |
252fbfc8 | 2463 | |
fc1cf338 PA |
2464 | it = displaced->step_request_queue; |
2465 | prev_next_p = &displaced->step_request_queue; | |
2466 | while (it) | |
252fbfc8 | 2467 | { |
fc1cf338 PA |
2468 | if (ptid_match (it->ptid, ptid)) |
2469 | { | |
2470 | *prev_next_p = it->next; | |
2471 | it->next = NULL; | |
2472 | xfree (it); | |
2473 | } | |
252fbfc8 | 2474 | else |
fc1cf338 PA |
2475 | { |
2476 | prev_next_p = &it->next; | |
2477 | } | |
252fbfc8 | 2478 | |
fc1cf338 | 2479 | it = *prev_next_p; |
252fbfc8 | 2480 | } |
252fbfc8 PA |
2481 | } |
2482 | ||
2483 | iterate_over_threads (infrun_thread_stop_requested_callback, &ptid); | |
2484 | } | |
2485 | ||
a07daef3 PA |
2486 | static void |
2487 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
2488 | { | |
2489 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
2490 | nullify_last_target_wait_ptid (); | |
2491 | } | |
2492 | ||
4e1c45ea PA |
2493 | /* Callback for iterate_over_threads. */ |
2494 | ||
2495 | static int | |
2496 | delete_step_resume_breakpoint_callback (struct thread_info *info, void *data) | |
2497 | { | |
2498 | if (is_exited (info->ptid)) | |
2499 | return 0; | |
2500 | ||
2501 | delete_step_resume_breakpoint (info); | |
186c406b | 2502 | delete_exception_resume_breakpoint (info); |
4e1c45ea PA |
2503 | return 0; |
2504 | } | |
2505 | ||
2506 | /* In all-stop, delete the step resume breakpoint of any thread that | |
2507 | had one. In non-stop, delete the step resume breakpoint of the | |
2508 | thread that just stopped. */ | |
2509 | ||
2510 | static void | |
2511 | delete_step_thread_step_resume_breakpoint (void) | |
2512 | { | |
2513 | if (!target_has_execution | |
2514 | || ptid_equal (inferior_ptid, null_ptid)) | |
2515 | /* If the inferior has exited, we have already deleted the step | |
2516 | resume breakpoints out of GDB's lists. */ | |
2517 | return; | |
2518 | ||
2519 | if (non_stop) | |
2520 | { | |
2521 | /* If in non-stop mode, only delete the step-resume or | |
2522 | longjmp-resume breakpoint of the thread that just stopped | |
2523 | stepping. */ | |
2524 | struct thread_info *tp = inferior_thread (); | |
abbb1732 | 2525 | |
4e1c45ea | 2526 | delete_step_resume_breakpoint (tp); |
186c406b | 2527 | delete_exception_resume_breakpoint (tp); |
4e1c45ea PA |
2528 | } |
2529 | else | |
2530 | /* In all-stop mode, delete all step-resume and longjmp-resume | |
2531 | breakpoints of any thread that had them. */ | |
2532 | iterate_over_threads (delete_step_resume_breakpoint_callback, NULL); | |
2533 | } | |
2534 | ||
1777feb0 | 2535 | /* A cleanup wrapper. */ |
4e1c45ea PA |
2536 | |
2537 | static void | |
2538 | delete_step_thread_step_resume_breakpoint_cleanup (void *arg) | |
2539 | { | |
2540 | delete_step_thread_step_resume_breakpoint (); | |
2541 | } | |
2542 | ||
223698f8 DE |
2543 | /* Pretty print the results of target_wait, for debugging purposes. */ |
2544 | ||
2545 | static void | |
2546 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, | |
2547 | const struct target_waitstatus *ws) | |
2548 | { | |
2549 | char *status_string = target_waitstatus_to_string (ws); | |
2550 | struct ui_file *tmp_stream = mem_fileopen (); | |
2551 | char *text; | |
223698f8 DE |
2552 | |
2553 | /* The text is split over several lines because it was getting too long. | |
2554 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
2555 | output as a unit; we want only one timestamp printed if debug_timestamp | |
2556 | is set. */ | |
2557 | ||
2558 | fprintf_unfiltered (tmp_stream, | |
2559 | "infrun: target_wait (%d", PIDGET (waiton_ptid)); | |
2560 | if (PIDGET (waiton_ptid) != -1) | |
2561 | fprintf_unfiltered (tmp_stream, | |
2562 | " [%s]", target_pid_to_str (waiton_ptid)); | |
2563 | fprintf_unfiltered (tmp_stream, ", status) =\n"); | |
2564 | fprintf_unfiltered (tmp_stream, | |
2565 | "infrun: %d [%s],\n", | |
2566 | PIDGET (result_ptid), target_pid_to_str (result_ptid)); | |
2567 | fprintf_unfiltered (tmp_stream, | |
2568 | "infrun: %s\n", | |
2569 | status_string); | |
2570 | ||
759ef836 | 2571 | text = ui_file_xstrdup (tmp_stream, NULL); |
223698f8 DE |
2572 | |
2573 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
2574 | a gcc error: the format attribute requires a string literal. */ | |
2575 | fprintf_unfiltered (gdb_stdlog, "%s", text); | |
2576 | ||
2577 | xfree (status_string); | |
2578 | xfree (text); | |
2579 | ui_file_delete (tmp_stream); | |
2580 | } | |
2581 | ||
24291992 PA |
2582 | /* Prepare and stabilize the inferior for detaching it. E.g., |
2583 | detaching while a thread is displaced stepping is a recipe for | |
2584 | crashing it, as nothing would readjust the PC out of the scratch | |
2585 | pad. */ | |
2586 | ||
2587 | void | |
2588 | prepare_for_detach (void) | |
2589 | { | |
2590 | struct inferior *inf = current_inferior (); | |
2591 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
2592 | struct cleanup *old_chain_1; | |
2593 | struct displaced_step_inferior_state *displaced; | |
2594 | ||
2595 | displaced = get_displaced_stepping_state (inf->pid); | |
2596 | ||
2597 | /* Is any thread of this process displaced stepping? If not, | |
2598 | there's nothing else to do. */ | |
2599 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
2600 | return; | |
2601 | ||
2602 | if (debug_infrun) | |
2603 | fprintf_unfiltered (gdb_stdlog, | |
2604 | "displaced-stepping in-process while detaching"); | |
2605 | ||
2606 | old_chain_1 = make_cleanup_restore_integer (&inf->detaching); | |
2607 | inf->detaching = 1; | |
2608 | ||
2609 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
2610 | { | |
2611 | struct cleanup *old_chain_2; | |
2612 | struct execution_control_state ecss; | |
2613 | struct execution_control_state *ecs; | |
2614 | ||
2615 | ecs = &ecss; | |
2616 | memset (ecs, 0, sizeof (*ecs)); | |
2617 | ||
2618 | overlay_cache_invalid = 1; | |
2619 | ||
24291992 PA |
2620 | if (deprecated_target_wait_hook) |
2621 | ecs->ptid = deprecated_target_wait_hook (pid_ptid, &ecs->ws, 0); | |
2622 | else | |
2623 | ecs->ptid = target_wait (pid_ptid, &ecs->ws, 0); | |
2624 | ||
2625 | if (debug_infrun) | |
2626 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
2627 | ||
2628 | /* If an error happens while handling the event, propagate GDB's | |
2629 | knowledge of the executing state to the frontend/user running | |
2630 | state. */ | |
3e43a32a MS |
2631 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, |
2632 | &minus_one_ptid); | |
24291992 | 2633 | |
4d533103 PA |
2634 | /* In non-stop mode, each thread is handled individually. |
2635 | Switch early, so the global state is set correctly for this | |
2636 | thread. */ | |
2637 | if (non_stop | |
2638 | && ecs->ws.kind != TARGET_WAITKIND_EXITED | |
2639 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) | |
2640 | context_switch (ecs->ptid); | |
2641 | ||
24291992 PA |
2642 | /* Now figure out what to do with the result of the result. */ |
2643 | handle_inferior_event (ecs); | |
2644 | ||
2645 | /* No error, don't finish the state yet. */ | |
2646 | discard_cleanups (old_chain_2); | |
2647 | ||
2648 | /* Breakpoints and watchpoints are not installed on the target | |
2649 | at this point, and signals are passed directly to the | |
2650 | inferior, so this must mean the process is gone. */ | |
2651 | if (!ecs->wait_some_more) | |
2652 | { | |
2653 | discard_cleanups (old_chain_1); | |
2654 | error (_("Program exited while detaching")); | |
2655 | } | |
2656 | } | |
2657 | ||
2658 | discard_cleanups (old_chain_1); | |
2659 | } | |
2660 | ||
cd0fc7c3 | 2661 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 2662 | |
cd0fc7c3 SS |
2663 | If inferior gets a signal, we may decide to start it up again |
2664 | instead of returning. That is why there is a loop in this function. | |
2665 | When this function actually returns it means the inferior | |
2666 | should be left stopped and GDB should read more commands. */ | |
2667 | ||
2668 | void | |
e4c8541f | 2669 | wait_for_inferior (void) |
cd0fc7c3 SS |
2670 | { |
2671 | struct cleanup *old_cleanups; | |
0d1e5fa7 | 2672 | struct execution_control_state ecss; |
cd0fc7c3 | 2673 | struct execution_control_state *ecs; |
c906108c | 2674 | |
527159b7 | 2675 | if (debug_infrun) |
ae123ec6 | 2676 | fprintf_unfiltered |
e4c8541f | 2677 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 2678 | |
4e1c45ea PA |
2679 | old_cleanups = |
2680 | make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup, NULL); | |
cd0fc7c3 | 2681 | |
cd0fc7c3 | 2682 | ecs = &ecss; |
0d1e5fa7 PA |
2683 | memset (ecs, 0, sizeof (*ecs)); |
2684 | ||
c906108c SS |
2685 | while (1) |
2686 | { | |
29f49a6a PA |
2687 | struct cleanup *old_chain; |
2688 | ||
ec9499be | 2689 | overlay_cache_invalid = 1; |
ec9499be | 2690 | |
9a4105ab | 2691 | if (deprecated_target_wait_hook) |
47608cb1 | 2692 | ecs->ptid = deprecated_target_wait_hook (waiton_ptid, &ecs->ws, 0); |
cd0fc7c3 | 2693 | else |
47608cb1 | 2694 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 2695 | |
f00150c9 | 2696 | if (debug_infrun) |
223698f8 | 2697 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 2698 | |
29f49a6a PA |
2699 | /* If an error happens while handling the event, propagate GDB's |
2700 | knowledge of the executing state to the frontend/user running | |
2701 | state. */ | |
2702 | old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2703 | ||
cd0fc7c3 SS |
2704 | /* Now figure out what to do with the result of the result. */ |
2705 | handle_inferior_event (ecs); | |
c906108c | 2706 | |
29f49a6a PA |
2707 | /* No error, don't finish the state yet. */ |
2708 | discard_cleanups (old_chain); | |
2709 | ||
cd0fc7c3 SS |
2710 | if (!ecs->wait_some_more) |
2711 | break; | |
2712 | } | |
4e1c45ea | 2713 | |
cd0fc7c3 SS |
2714 | do_cleanups (old_cleanups); |
2715 | } | |
c906108c | 2716 | |
1777feb0 | 2717 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 2718 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
2719 | descriptor corresponding to the target. It can be called more than |
2720 | once to complete a single execution command. In such cases we need | |
2721 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
2722 | that this function is called for a single execution command, then |
2723 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 2724 | necessary cleanups. */ |
43ff13b4 JM |
2725 | |
2726 | void | |
fba45db2 | 2727 | fetch_inferior_event (void *client_data) |
43ff13b4 | 2728 | { |
0d1e5fa7 | 2729 | struct execution_control_state ecss; |
a474d7c2 | 2730 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 2731 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 2732 | struct cleanup *ts_old_chain; |
4f8d22e3 | 2733 | int was_sync = sync_execution; |
0f641c01 | 2734 | int cmd_done = 0; |
43ff13b4 | 2735 | |
0d1e5fa7 PA |
2736 | memset (ecs, 0, sizeof (*ecs)); |
2737 | ||
c5187ac6 PA |
2738 | /* We're handling a live event, so make sure we're doing live |
2739 | debugging. If we're looking at traceframes while the target is | |
2740 | running, we're going to need to get back to that mode after | |
2741 | handling the event. */ | |
2742 | if (non_stop) | |
2743 | { | |
2744 | make_cleanup_restore_current_traceframe (); | |
e6e4e701 | 2745 | set_current_traceframe (-1); |
c5187ac6 PA |
2746 | } |
2747 | ||
4f8d22e3 PA |
2748 | if (non_stop) |
2749 | /* In non-stop mode, the user/frontend should not notice a thread | |
2750 | switch due to internal events. Make sure we reverse to the | |
2751 | user selected thread and frame after handling the event and | |
2752 | running any breakpoint commands. */ | |
2753 | make_cleanup_restore_current_thread (); | |
2754 | ||
ec9499be | 2755 | overlay_cache_invalid = 1; |
3dd5b83d | 2756 | |
32231432 PA |
2757 | make_cleanup_restore_integer (&execution_direction); |
2758 | execution_direction = target_execution_direction (); | |
2759 | ||
9a4105ab | 2760 | if (deprecated_target_wait_hook) |
a474d7c2 | 2761 | ecs->ptid = |
47608cb1 | 2762 | deprecated_target_wait_hook (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 2763 | else |
47608cb1 | 2764 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 2765 | |
f00150c9 | 2766 | if (debug_infrun) |
223698f8 | 2767 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 2768 | |
94cc34af PA |
2769 | if (non_stop |
2770 | && ecs->ws.kind != TARGET_WAITKIND_IGNORE | |
0e5bf2a8 | 2771 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED |
94cc34af PA |
2772 | && ecs->ws.kind != TARGET_WAITKIND_EXITED |
2773 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) | |
2774 | /* In non-stop mode, each thread is handled individually. Switch | |
2775 | early, so the global state is set correctly for this | |
2776 | thread. */ | |
2777 | context_switch (ecs->ptid); | |
2778 | ||
29f49a6a PA |
2779 | /* If an error happens while handling the event, propagate GDB's |
2780 | knowledge of the executing state to the frontend/user running | |
2781 | state. */ | |
2782 | if (!non_stop) | |
2783 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2784 | else | |
2785 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
2786 | ||
353d1d73 JK |
2787 | /* Get executed before make_cleanup_restore_current_thread above to apply |
2788 | still for the thread which has thrown the exception. */ | |
2789 | make_bpstat_clear_actions_cleanup (); | |
2790 | ||
43ff13b4 | 2791 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 2792 | handle_inferior_event (ecs); |
43ff13b4 | 2793 | |
a474d7c2 | 2794 | if (!ecs->wait_some_more) |
43ff13b4 | 2795 | { |
d6b48e9c PA |
2796 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); |
2797 | ||
4e1c45ea | 2798 | delete_step_thread_step_resume_breakpoint (); |
f107f563 | 2799 | |
d6b48e9c | 2800 | /* We may not find an inferior if this was a process exit. */ |
16c381f0 | 2801 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) |
83c265ab PA |
2802 | normal_stop (); |
2803 | ||
af679fd0 | 2804 | if (target_has_execution |
0e5bf2a8 | 2805 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED |
af679fd0 PA |
2806 | && ecs->ws.kind != TARGET_WAITKIND_EXITED |
2807 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
2808 | && ecs->event_thread->step_multi | |
16c381f0 | 2809 | && ecs->event_thread->control.stop_step) |
c2d11a7d JM |
2810 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); |
2811 | else | |
0f641c01 PA |
2812 | { |
2813 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
2814 | cmd_done = 1; | |
2815 | } | |
43ff13b4 | 2816 | } |
4f8d22e3 | 2817 | |
29f49a6a PA |
2818 | /* No error, don't finish the thread states yet. */ |
2819 | discard_cleanups (ts_old_chain); | |
2820 | ||
4f8d22e3 PA |
2821 | /* Revert thread and frame. */ |
2822 | do_cleanups (old_chain); | |
2823 | ||
2824 | /* If the inferior was in sync execution mode, and now isn't, | |
0f641c01 PA |
2825 | restore the prompt (a synchronous execution command has finished, |
2826 | and we're ready for input). */ | |
b4a14fd0 | 2827 | if (interpreter_async && was_sync && !sync_execution) |
4f8d22e3 | 2828 | display_gdb_prompt (0); |
0f641c01 PA |
2829 | |
2830 | if (cmd_done | |
2831 | && !was_sync | |
2832 | && exec_done_display_p | |
2833 | && (ptid_equal (inferior_ptid, null_ptid) | |
2834 | || !is_running (inferior_ptid))) | |
2835 | printf_unfiltered (_("completed.\n")); | |
43ff13b4 JM |
2836 | } |
2837 | ||
edb3359d DJ |
2838 | /* Record the frame and location we're currently stepping through. */ |
2839 | void | |
2840 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
2841 | { | |
2842 | struct thread_info *tp = inferior_thread (); | |
2843 | ||
16c381f0 JK |
2844 | tp->control.step_frame_id = get_frame_id (frame); |
2845 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
2846 | |
2847 | tp->current_symtab = sal.symtab; | |
2848 | tp->current_line = sal.line; | |
2849 | } | |
2850 | ||
0d1e5fa7 PA |
2851 | /* Clear context switchable stepping state. */ |
2852 | ||
2853 | void | |
4e1c45ea | 2854 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 PA |
2855 | { |
2856 | tss->stepping_over_breakpoint = 0; | |
2857 | tss->step_after_step_resume_breakpoint = 0; | |
cd0fc7c3 SS |
2858 | } |
2859 | ||
e02bc4cc | 2860 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
2861 | target_wait()/deprecated_target_wait_hook(). The data is actually |
2862 | cached by handle_inferior_event(), which gets called immediately | |
2863 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
2864 | |
2865 | void | |
488f131b | 2866 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 2867 | { |
39f77062 | 2868 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
2869 | *status = target_last_waitstatus; |
2870 | } | |
2871 | ||
ac264b3b MS |
2872 | void |
2873 | nullify_last_target_wait_ptid (void) | |
2874 | { | |
2875 | target_last_wait_ptid = minus_one_ptid; | |
2876 | } | |
2877 | ||
dcf4fbde | 2878 | /* Switch thread contexts. */ |
dd80620e MS |
2879 | |
2880 | static void | |
0d1e5fa7 | 2881 | context_switch (ptid_t ptid) |
dd80620e | 2882 | { |
4b51d87b | 2883 | if (debug_infrun && !ptid_equal (ptid, inferior_ptid)) |
fd48f117 DJ |
2884 | { |
2885 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
2886 | target_pid_to_str (inferior_ptid)); | |
2887 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 2888 | target_pid_to_str (ptid)); |
fd48f117 DJ |
2889 | } |
2890 | ||
0d1e5fa7 | 2891 | switch_to_thread (ptid); |
dd80620e MS |
2892 | } |
2893 | ||
4fa8626c DJ |
2894 | static void |
2895 | adjust_pc_after_break (struct execution_control_state *ecs) | |
2896 | { | |
24a73cce UW |
2897 | struct regcache *regcache; |
2898 | struct gdbarch *gdbarch; | |
6c95b8df | 2899 | struct address_space *aspace; |
8aad930b | 2900 | CORE_ADDR breakpoint_pc; |
4fa8626c | 2901 | |
4fa8626c DJ |
2902 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
2903 | we aren't, just return. | |
9709f61c DJ |
2904 | |
2905 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
2906 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
2907 | implemented by software breakpoints should be handled through the normal | |
2908 | breakpoint layer. | |
8fb3e588 | 2909 | |
4fa8626c DJ |
2910 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
2911 | different signals (SIGILL or SIGEMT for instance), but it is less | |
2912 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
2913 | gdbarch_decr_pc_after_break. I don't know any specific target that |
2914 | generates these signals at breakpoints (the code has been in GDB since at | |
2915 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 2916 | |
e6cf7916 UW |
2917 | In earlier versions of GDB, a target with |
2918 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
2919 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
2920 | target with both of these set in GDB history, and it seems unlikely to be | |
2921 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c DJ |
2922 | |
2923 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
2924 | return; | |
2925 | ||
2926 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
2927 | return; | |
2928 | ||
4058b839 PA |
2929 | /* In reverse execution, when a breakpoint is hit, the instruction |
2930 | under it has already been de-executed. The reported PC always | |
2931 | points at the breakpoint address, so adjusting it further would | |
2932 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
2933 | architecture: | |
2934 | ||
2935 | B1 0x08000000 : INSN1 | |
2936 | B2 0x08000001 : INSN2 | |
2937 | 0x08000002 : INSN3 | |
2938 | PC -> 0x08000003 : INSN4 | |
2939 | ||
2940 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
2941 | from that point should hit B2 as below. Reading the PC when the | |
2942 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
2943 | been de-executed already. | |
2944 | ||
2945 | B1 0x08000000 : INSN1 | |
2946 | B2 PC -> 0x08000001 : INSN2 | |
2947 | 0x08000002 : INSN3 | |
2948 | 0x08000003 : INSN4 | |
2949 | ||
2950 | We can't apply the same logic as for forward execution, because | |
2951 | we would wrongly adjust the PC to 0x08000000, since there's a | |
2952 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
2953 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
2954 | behaviour. */ | |
2955 | if (execution_direction == EXEC_REVERSE) | |
2956 | return; | |
2957 | ||
24a73cce UW |
2958 | /* If this target does not decrement the PC after breakpoints, then |
2959 | we have nothing to do. */ | |
2960 | regcache = get_thread_regcache (ecs->ptid); | |
2961 | gdbarch = get_regcache_arch (regcache); | |
2962 | if (gdbarch_decr_pc_after_break (gdbarch) == 0) | |
2963 | return; | |
2964 | ||
6c95b8df PA |
2965 | aspace = get_regcache_aspace (regcache); |
2966 | ||
8aad930b AC |
2967 | /* Find the location where (if we've hit a breakpoint) the |
2968 | breakpoint would be. */ | |
515630c5 UW |
2969 | breakpoint_pc = regcache_read_pc (regcache) |
2970 | - gdbarch_decr_pc_after_break (gdbarch); | |
8aad930b | 2971 | |
1c5cfe86 PA |
2972 | /* Check whether there actually is a software breakpoint inserted at |
2973 | that location. | |
2974 | ||
2975 | If in non-stop mode, a race condition is possible where we've | |
2976 | removed a breakpoint, but stop events for that breakpoint were | |
2977 | already queued and arrive later. To suppress those spurious | |
2978 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
2979 | and retire them after a number of stop events are reported. */ | |
6c95b8df PA |
2980 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
2981 | || (non_stop && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 2982 | { |
96429cc8 | 2983 | struct cleanup *old_cleanups = NULL; |
abbb1732 | 2984 | |
96429cc8 HZ |
2985 | if (RECORD_IS_USED) |
2986 | old_cleanups = record_gdb_operation_disable_set (); | |
2987 | ||
1c0fdd0e UW |
2988 | /* When using hardware single-step, a SIGTRAP is reported for both |
2989 | a completed single-step and a software breakpoint. Need to | |
2990 | differentiate between the two, as the latter needs adjusting | |
2991 | but the former does not. | |
2992 | ||
2993 | The SIGTRAP can be due to a completed hardware single-step only if | |
2994 | - we didn't insert software single-step breakpoints | |
2995 | - the thread to be examined is still the current thread | |
2996 | - this thread is currently being stepped | |
2997 | ||
2998 | If any of these events did not occur, we must have stopped due | |
2999 | to hitting a software breakpoint, and have to back up to the | |
3000 | breakpoint address. | |
3001 | ||
3002 | As a special case, we could have hardware single-stepped a | |
3003 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
3004 | we also need to back up to the breakpoint address. */ | |
3005 | ||
3006 | if (singlestep_breakpoints_inserted_p | |
3007 | || !ptid_equal (ecs->ptid, inferior_ptid) | |
4e1c45ea PA |
3008 | || !currently_stepping (ecs->event_thread) |
3009 | || ecs->event_thread->prev_pc == breakpoint_pc) | |
515630c5 | 3010 | regcache_write_pc (regcache, breakpoint_pc); |
96429cc8 HZ |
3011 | |
3012 | if (RECORD_IS_USED) | |
3013 | do_cleanups (old_cleanups); | |
8aad930b | 3014 | } |
4fa8626c DJ |
3015 | } |
3016 | ||
0d1e5fa7 PA |
3017 | void |
3018 | init_infwait_state (void) | |
3019 | { | |
3020 | waiton_ptid = pid_to_ptid (-1); | |
3021 | infwait_state = infwait_normal_state; | |
3022 | } | |
3023 | ||
94cc34af PA |
3024 | void |
3025 | error_is_running (void) | |
3026 | { | |
3e43a32a MS |
3027 | error (_("Cannot execute this command while " |
3028 | "the selected thread is running.")); | |
94cc34af PA |
3029 | } |
3030 | ||
3031 | void | |
3032 | ensure_not_running (void) | |
3033 | { | |
3034 | if (is_running (inferior_ptid)) | |
3035 | error_is_running (); | |
3036 | } | |
3037 | ||
edb3359d DJ |
3038 | static int |
3039 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
3040 | { | |
3041 | for (frame = get_prev_frame (frame); | |
3042 | frame != NULL; | |
3043 | frame = get_prev_frame (frame)) | |
3044 | { | |
3045 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
3046 | return 1; | |
3047 | if (get_frame_type (frame) != INLINE_FRAME) | |
3048 | break; | |
3049 | } | |
3050 | ||
3051 | return 0; | |
3052 | } | |
3053 | ||
a96d9b2e SDJ |
3054 | /* Auxiliary function that handles syscall entry/return events. |
3055 | It returns 1 if the inferior should keep going (and GDB | |
3056 | should ignore the event), or 0 if the event deserves to be | |
3057 | processed. */ | |
ca2163eb | 3058 | |
a96d9b2e | 3059 | static int |
ca2163eb | 3060 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 3061 | { |
ca2163eb PA |
3062 | struct regcache *regcache; |
3063 | struct gdbarch *gdbarch; | |
3064 | int syscall_number; | |
3065 | ||
3066 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3067 | context_switch (ecs->ptid); | |
3068 | ||
3069 | regcache = get_thread_regcache (ecs->ptid); | |
3070 | gdbarch = get_regcache_arch (regcache); | |
f90263c1 | 3071 | syscall_number = ecs->ws.value.syscall_number; |
ca2163eb PA |
3072 | stop_pc = regcache_read_pc (regcache); |
3073 | ||
a96d9b2e SDJ |
3074 | if (catch_syscall_enabled () > 0 |
3075 | && catching_syscall_number (syscall_number) > 0) | |
3076 | { | |
3077 | if (debug_infrun) | |
3078 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
3079 | syscall_number); | |
a96d9b2e | 3080 | |
16c381f0 | 3081 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 3082 | = bpstat_stop_status (get_regcache_aspace (regcache), |
09ac7c10 | 3083 | stop_pc, ecs->ptid, &ecs->ws); |
16c381f0 JK |
3084 | ecs->random_signal |
3085 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat); | |
a96d9b2e | 3086 | |
ca2163eb PA |
3087 | if (!ecs->random_signal) |
3088 | { | |
3089 | /* Catchpoint hit. */ | |
16c381f0 | 3090 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_TRAP; |
ca2163eb PA |
3091 | return 0; |
3092 | } | |
a96d9b2e | 3093 | } |
ca2163eb PA |
3094 | |
3095 | /* If no catchpoint triggered for this, then keep going. */ | |
16c381f0 | 3096 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; |
ca2163eb PA |
3097 | keep_going (ecs); |
3098 | return 1; | |
a96d9b2e SDJ |
3099 | } |
3100 | ||
7e324e48 GB |
3101 | /* Clear the supplied execution_control_state's stop_func_* fields. */ |
3102 | ||
3103 | static void | |
3104 | clear_stop_func (struct execution_control_state *ecs) | |
3105 | { | |
3106 | ecs->stop_func_filled_in = 0; | |
3107 | ecs->stop_func_start = 0; | |
3108 | ecs->stop_func_end = 0; | |
3109 | ecs->stop_func_name = NULL; | |
3110 | } | |
3111 | ||
3112 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ | |
3113 | ||
3114 | static void | |
3115 | fill_in_stop_func (struct gdbarch *gdbarch, | |
3116 | struct execution_control_state *ecs) | |
3117 | { | |
3118 | if (!ecs->stop_func_filled_in) | |
3119 | { | |
3120 | /* Don't care about return value; stop_func_start and stop_func_name | |
3121 | will both be 0 if it doesn't work. */ | |
3122 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
3123 | &ecs->stop_func_start, &ecs->stop_func_end); | |
3124 | ecs->stop_func_start | |
3125 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
3126 | ||
3127 | ecs->stop_func_filled_in = 1; | |
3128 | } | |
3129 | } | |
3130 | ||
cd0fc7c3 SS |
3131 | /* Given an execution control state that has been freshly filled in |
3132 | by an event from the inferior, figure out what it means and take | |
3133 | appropriate action. */ | |
c906108c | 3134 | |
ec9499be | 3135 | static void |
96baa820 | 3136 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 3137 | { |
568d6575 UW |
3138 | struct frame_info *frame; |
3139 | struct gdbarch *gdbarch; | |
d983da9c DJ |
3140 | int stopped_by_watchpoint; |
3141 | int stepped_after_stopped_by_watchpoint = 0; | |
2afb61aa | 3142 | struct symtab_and_line stop_pc_sal; |
d6b48e9c PA |
3143 | enum stop_kind stop_soon; |
3144 | ||
28736962 PA |
3145 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
3146 | { | |
3147 | /* We had an event in the inferior, but we are not interested in | |
3148 | handling it at this level. The lower layers have already | |
3149 | done what needs to be done, if anything. | |
3150 | ||
3151 | One of the possible circumstances for this is when the | |
3152 | inferior produces output for the console. The inferior has | |
3153 | not stopped, and we are ignoring the event. Another possible | |
3154 | circumstance is any event which the lower level knows will be | |
3155 | reported multiple times without an intervening resume. */ | |
3156 | if (debug_infrun) | |
3157 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
3158 | prepare_to_wait (ecs); | |
3159 | return; | |
3160 | } | |
3161 | ||
0e5bf2a8 PA |
3162 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
3163 | && target_can_async_p () && !sync_execution) | |
3164 | { | |
3165 | /* There were no unwaited-for children left in the target, but, | |
3166 | we're not synchronously waiting for events either. Just | |
3167 | ignore. Otherwise, if we were running a synchronous | |
3168 | execution command, we need to cancel it and give the user | |
3169 | back the terminal. */ | |
3170 | if (debug_infrun) | |
3171 | fprintf_unfiltered (gdb_stdlog, | |
3172 | "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n"); | |
3173 | prepare_to_wait (ecs); | |
3174 | return; | |
3175 | } | |
3176 | ||
d6b48e9c | 3177 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
0e5bf2a8 PA |
3178 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED |
3179 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
d6b48e9c PA |
3180 | { |
3181 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); | |
abbb1732 | 3182 | |
d6b48e9c | 3183 | gdb_assert (inf); |
16c381f0 | 3184 | stop_soon = inf->control.stop_soon; |
d6b48e9c PA |
3185 | } |
3186 | else | |
3187 | stop_soon = NO_STOP_QUIETLY; | |
cd0fc7c3 | 3188 | |
1777feb0 | 3189 | /* Cache the last pid/waitstatus. */ |
39f77062 | 3190 | target_last_wait_ptid = ecs->ptid; |
0d1e5fa7 | 3191 | target_last_waitstatus = ecs->ws; |
e02bc4cc | 3192 | |
ca005067 | 3193 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 3194 | stop_stack_dummy = STOP_NONE; |
ca005067 | 3195 | |
0e5bf2a8 PA |
3196 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
3197 | { | |
3198 | /* No unwaited-for children left. IOW, all resumed children | |
3199 | have exited. */ | |
3200 | if (debug_infrun) | |
3201 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
3202 | ||
3203 | stop_print_frame = 0; | |
3204 | stop_stepping (ecs); | |
3205 | return; | |
3206 | } | |
3207 | ||
1777feb0 | 3208 | /* If it's a new process, add it to the thread database. */ |
8c90c137 LM |
3209 | |
3210 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) | |
3211 | && !ptid_equal (ecs->ptid, minus_one_ptid) | |
3212 | && !in_thread_list (ecs->ptid)); | |
3213 | ||
3214 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
3215 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
3216 | add_thread (ecs->ptid); | |
3217 | ||
e09875d4 | 3218 | ecs->event_thread = find_thread_ptid (ecs->ptid); |
88ed393a JK |
3219 | |
3220 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
3221 | adjust_pc_after_break (ecs); | |
3222 | ||
3223 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
3224 | reinit_frame_cache (); | |
3225 | ||
28736962 PA |
3226 | breakpoint_retire_moribund (); |
3227 | ||
2b009048 DJ |
3228 | /* First, distinguish signals caused by the debugger from signals |
3229 | that have to do with the program's own actions. Note that | |
3230 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
3231 | on the operating system version. Here we detect when a SIGILL or | |
3232 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
3233 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
3234 | when we're trying to execute a breakpoint instruction on a | |
3235 | non-executable stack. This happens for call dummy breakpoints | |
3236 | for architectures like SPARC that place call dummies on the | |
3237 | stack. */ | |
2b009048 DJ |
3238 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
3239 | && (ecs->ws.value.sig == TARGET_SIGNAL_ILL | |
3240 | || ecs->ws.value.sig == TARGET_SIGNAL_SEGV | |
de0a0249 | 3241 | || ecs->ws.value.sig == TARGET_SIGNAL_EMT)) |
2b009048 | 3242 | { |
de0a0249 UW |
3243 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
3244 | ||
3245 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
3246 | regcache_read_pc (regcache))) | |
3247 | { | |
3248 | if (debug_infrun) | |
3249 | fprintf_unfiltered (gdb_stdlog, | |
3250 | "infrun: Treating signal as SIGTRAP\n"); | |
3251 | ecs->ws.value.sig = TARGET_SIGNAL_TRAP; | |
3252 | } | |
2b009048 DJ |
3253 | } |
3254 | ||
28736962 PA |
3255 | /* Mark the non-executing threads accordingly. In all-stop, all |
3256 | threads of all processes are stopped when we get any event | |
3257 | reported. In non-stop mode, only the event thread stops. If | |
3258 | we're handling a process exit in non-stop mode, there's nothing | |
3259 | to do, as threads of the dead process are gone, and threads of | |
3260 | any other process were left running. */ | |
3261 | if (!non_stop) | |
3262 | set_executing (minus_one_ptid, 0); | |
3263 | else if (ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
3264 | && ecs->ws.kind != TARGET_WAITKIND_EXITED) | |
7aee8dc2 | 3265 | set_executing (ecs->ptid, 0); |
8c90c137 | 3266 | |
0d1e5fa7 | 3267 | switch (infwait_state) |
488f131b JB |
3268 | { |
3269 | case infwait_thread_hop_state: | |
527159b7 | 3270 | if (debug_infrun) |
8a9de0e4 | 3271 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); |
65e82032 | 3272 | break; |
b83266a0 | 3273 | |
488f131b | 3274 | case infwait_normal_state: |
527159b7 | 3275 | if (debug_infrun) |
8a9de0e4 | 3276 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
d983da9c DJ |
3277 | break; |
3278 | ||
3279 | case infwait_step_watch_state: | |
3280 | if (debug_infrun) | |
3281 | fprintf_unfiltered (gdb_stdlog, | |
3282 | "infrun: infwait_step_watch_state\n"); | |
3283 | ||
3284 | stepped_after_stopped_by_watchpoint = 1; | |
488f131b | 3285 | break; |
b83266a0 | 3286 | |
488f131b | 3287 | case infwait_nonstep_watch_state: |
527159b7 | 3288 | if (debug_infrun) |
8a9de0e4 AC |
3289 | fprintf_unfiltered (gdb_stdlog, |
3290 | "infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 3291 | insert_breakpoints (); |
c906108c | 3292 | |
488f131b JB |
3293 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
3294 | handle things like signals arriving and other things happening | |
3295 | in combination correctly? */ | |
3296 | stepped_after_stopped_by_watchpoint = 1; | |
3297 | break; | |
65e82032 AC |
3298 | |
3299 | default: | |
e2e0b3e5 | 3300 | internal_error (__FILE__, __LINE__, _("bad switch")); |
488f131b | 3301 | } |
ec9499be | 3302 | |
0d1e5fa7 | 3303 | infwait_state = infwait_normal_state; |
ec9499be | 3304 | waiton_ptid = pid_to_ptid (-1); |
c906108c | 3305 | |
488f131b JB |
3306 | switch (ecs->ws.kind) |
3307 | { | |
3308 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 3309 | if (debug_infrun) |
8a9de0e4 | 3310 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
b0f4b84b DJ |
3311 | /* Ignore gracefully during startup of the inferior, as it might |
3312 | be the shell which has just loaded some objects, otherwise | |
3313 | add the symbols for the newly loaded objects. Also ignore at | |
3314 | the beginning of an attach or remote session; we will query | |
3315 | the full list of libraries once the connection is | |
3316 | established. */ | |
c0236d92 | 3317 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 3318 | { |
edcc5120 TT |
3319 | struct regcache *regcache; |
3320 | ||
3321 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3322 | context_switch (ecs->ptid); | |
3323 | regcache = get_thread_regcache (ecs->ptid); | |
3324 | ||
3325 | handle_solib_event (); | |
3326 | ||
3327 | ecs->event_thread->control.stop_bpstat | |
3328 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
3329 | stop_pc, ecs->ptid, &ecs->ws); | |
3330 | ecs->random_signal | |
3331 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat); | |
3332 | ||
3333 | if (!ecs->random_signal) | |
3334 | { | |
3335 | /* A catchpoint triggered. */ | |
3336 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_TRAP; | |
3337 | goto process_event_stop_test; | |
3338 | } | |
488f131b | 3339 | |
b0f4b84b DJ |
3340 | /* If requested, stop when the dynamic linker notifies |
3341 | gdb of events. This allows the user to get control | |
3342 | and place breakpoints in initializer routines for | |
3343 | dynamically loaded objects (among other things). */ | |
edcc5120 | 3344 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; |
b0f4b84b DJ |
3345 | if (stop_on_solib_events) |
3346 | { | |
55409f9d DJ |
3347 | /* Make sure we print "Stopped due to solib-event" in |
3348 | normal_stop. */ | |
3349 | stop_print_frame = 1; | |
3350 | ||
b0f4b84b DJ |
3351 | stop_stepping (ecs); |
3352 | return; | |
3353 | } | |
488f131b | 3354 | } |
b0f4b84b DJ |
3355 | |
3356 | /* If we are skipping through a shell, or through shared library | |
3357 | loading that we aren't interested in, resume the program. If | |
3358 | we're running the program normally, also resume. But stop if | |
3359 | we're attaching or setting up a remote connection. */ | |
3360 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
3361 | { | |
74960c60 VP |
3362 | /* Loading of shared libraries might have changed breakpoint |
3363 | addresses. Make sure new breakpoints are inserted. */ | |
0b02b92d UW |
3364 | if (stop_soon == NO_STOP_QUIETLY |
3365 | && !breakpoints_always_inserted_mode ()) | |
74960c60 | 3366 | insert_breakpoints (); |
b0f4b84b DJ |
3367 | resume (0, TARGET_SIGNAL_0); |
3368 | prepare_to_wait (ecs); | |
3369 | return; | |
3370 | } | |
3371 | ||
3372 | break; | |
c5aa993b | 3373 | |
488f131b | 3374 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 3375 | if (debug_infrun) |
8a9de0e4 | 3376 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
488f131b JB |
3377 | resume (0, TARGET_SIGNAL_0); |
3378 | prepare_to_wait (ecs); | |
3379 | return; | |
c5aa993b | 3380 | |
488f131b | 3381 | case TARGET_WAITKIND_EXITED: |
527159b7 | 3382 | if (debug_infrun) |
8a9de0e4 | 3383 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n"); |
fb66883a | 3384 | inferior_ptid = ecs->ptid; |
6c95b8df PA |
3385 | set_current_inferior (find_inferior_pid (ptid_get_pid (ecs->ptid))); |
3386 | set_current_program_space (current_inferior ()->pspace); | |
3387 | handle_vfork_child_exec_or_exit (0); | |
1777feb0 | 3388 | target_terminal_ours (); /* Must do this before mourn anyway. */ |
33d62d64 | 3389 | print_exited_reason (ecs->ws.value.integer); |
488f131b JB |
3390 | |
3391 | /* Record the exit code in the convenience variable $_exitcode, so | |
3392 | that the user can inspect this again later. */ | |
4fa62494 UW |
3393 | set_internalvar_integer (lookup_internalvar ("_exitcode"), |
3394 | (LONGEST) ecs->ws.value.integer); | |
8cf64490 TT |
3395 | |
3396 | /* Also record this in the inferior itself. */ | |
3397 | current_inferior ()->has_exit_code = 1; | |
3398 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
3399 | ||
488f131b JB |
3400 | gdb_flush (gdb_stdout); |
3401 | target_mourn_inferior (); | |
1c0fdd0e | 3402 | singlestep_breakpoints_inserted_p = 0; |
d03285ec | 3403 | cancel_single_step_breakpoints (); |
488f131b JB |
3404 | stop_print_frame = 0; |
3405 | stop_stepping (ecs); | |
3406 | return; | |
c5aa993b | 3407 | |
488f131b | 3408 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 3409 | if (debug_infrun) |
8a9de0e4 | 3410 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n"); |
fb66883a | 3411 | inferior_ptid = ecs->ptid; |
6c95b8df PA |
3412 | set_current_inferior (find_inferior_pid (ptid_get_pid (ecs->ptid))); |
3413 | set_current_program_space (current_inferior ()->pspace); | |
3414 | handle_vfork_child_exec_or_exit (0); | |
488f131b | 3415 | stop_print_frame = 0; |
1777feb0 | 3416 | target_terminal_ours (); /* Must do this before mourn anyway. */ |
c5aa993b | 3417 | |
488f131b JB |
3418 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
3419 | reach here unless the inferior is dead. However, for years | |
3420 | target_kill() was called here, which hints that fatal signals aren't | |
3421 | really fatal on some systems. If that's true, then some changes | |
1777feb0 | 3422 | may be needed. */ |
488f131b | 3423 | target_mourn_inferior (); |
c906108c | 3424 | |
33d62d64 | 3425 | print_signal_exited_reason (ecs->ws.value.sig); |
1c0fdd0e | 3426 | singlestep_breakpoints_inserted_p = 0; |
d03285ec | 3427 | cancel_single_step_breakpoints (); |
488f131b JB |
3428 | stop_stepping (ecs); |
3429 | return; | |
c906108c | 3430 | |
488f131b | 3431 | /* The following are the only cases in which we keep going; |
1777feb0 | 3432 | the above cases end in a continue or goto. */ |
488f131b | 3433 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 3434 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 3435 | if (debug_infrun) |
8a9de0e4 | 3436 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); |
c906108c | 3437 | |
e2d96639 YQ |
3438 | /* Check whether the inferior is displaced stepping. */ |
3439 | { | |
3440 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
3441 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3442 | struct displaced_step_inferior_state *displaced | |
3443 | = get_displaced_stepping_state (ptid_get_pid (ecs->ptid)); | |
3444 | ||
3445 | /* If checking displaced stepping is supported, and thread | |
3446 | ecs->ptid is displaced stepping. */ | |
3447 | if (displaced && ptid_equal (displaced->step_ptid, ecs->ptid)) | |
3448 | { | |
3449 | struct inferior *parent_inf | |
3450 | = find_inferior_pid (ptid_get_pid (ecs->ptid)); | |
3451 | struct regcache *child_regcache; | |
3452 | CORE_ADDR parent_pc; | |
3453 | ||
3454 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
3455 | indicating that the displaced stepping of syscall instruction | |
3456 | has been done. Perform cleanup for parent process here. Note | |
3457 | that this operation also cleans up the child process for vfork, | |
3458 | because their pages are shared. */ | |
3459 | displaced_step_fixup (ecs->ptid, TARGET_SIGNAL_TRAP); | |
3460 | ||
3461 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
3462 | { | |
3463 | /* Restore scratch pad for child process. */ | |
3464 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
3465 | } | |
3466 | ||
3467 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
3468 | the child's PC is also within the scratchpad. Set the child's PC | |
3469 | to the parent's PC value, which has already been fixed up. | |
3470 | FIXME: we use the parent's aspace here, although we're touching | |
3471 | the child, because the child hasn't been added to the inferior | |
3472 | list yet at this point. */ | |
3473 | ||
3474 | child_regcache | |
3475 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
3476 | gdbarch, | |
3477 | parent_inf->aspace); | |
3478 | /* Read PC value of parent process. */ | |
3479 | parent_pc = regcache_read_pc (regcache); | |
3480 | ||
3481 | if (debug_displaced) | |
3482 | fprintf_unfiltered (gdb_stdlog, | |
3483 | "displaced: write child pc from %s to %s\n", | |
3484 | paddress (gdbarch, | |
3485 | regcache_read_pc (child_regcache)), | |
3486 | paddress (gdbarch, parent_pc)); | |
3487 | ||
3488 | regcache_write_pc (child_regcache, parent_pc); | |
3489 | } | |
3490 | } | |
3491 | ||
5a2901d9 DJ |
3492 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3493 | { | |
0d1e5fa7 | 3494 | context_switch (ecs->ptid); |
35f196d9 | 3495 | reinit_frame_cache (); |
5a2901d9 DJ |
3496 | } |
3497 | ||
b242c3c2 PA |
3498 | /* Immediately detach breakpoints from the child before there's |
3499 | any chance of letting the user delete breakpoints from the | |
3500 | breakpoint lists. If we don't do this early, it's easy to | |
3501 | leave left over traps in the child, vis: "break foo; catch | |
3502 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
3503 | the fork on the last `continue', and by that time the | |
3504 | breakpoint at "foo" is long gone from the breakpoint table. | |
3505 | If we vforked, then we don't need to unpatch here, since both | |
3506 | parent and child are sharing the same memory pages; we'll | |
3507 | need to unpatch at follow/detach time instead to be certain | |
3508 | that new breakpoints added between catchpoint hit time and | |
3509 | vfork follow are detached. */ | |
3510 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
3511 | { | |
3512 | int child_pid = ptid_get_pid (ecs->ws.value.related_pid); | |
3513 | ||
3514 | /* This won't actually modify the breakpoint list, but will | |
3515 | physically remove the breakpoints from the child. */ | |
3516 | detach_breakpoints (child_pid); | |
3517 | } | |
3518 | ||
d03285ec UW |
3519 | if (singlestep_breakpoints_inserted_p) |
3520 | { | |
1777feb0 | 3521 | /* Pull the single step breakpoints out of the target. */ |
d03285ec UW |
3522 | remove_single_step_breakpoints (); |
3523 | singlestep_breakpoints_inserted_p = 0; | |
3524 | } | |
3525 | ||
e58b0e63 PA |
3526 | /* In case the event is caught by a catchpoint, remember that |
3527 | the event is to be followed at the next resume of the thread, | |
3528 | and not immediately. */ | |
3529 | ecs->event_thread->pending_follow = ecs->ws; | |
3530 | ||
fb14de7b | 3531 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 3532 | |
16c381f0 | 3533 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 3534 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 3535 | stop_pc, ecs->ptid, &ecs->ws); |
675bf4cb | 3536 | |
67822962 PA |
3537 | /* Note that we're interested in knowing the bpstat actually |
3538 | causes a stop, not just if it may explain the signal. | |
3539 | Software watchpoints, for example, always appear in the | |
3540 | bpstat. */ | |
16c381f0 JK |
3541 | ecs->random_signal |
3542 | = !bpstat_causes_stop (ecs->event_thread->control.stop_bpstat); | |
04e68871 DJ |
3543 | |
3544 | /* If no catchpoint triggered for this, then keep going. */ | |
3545 | if (ecs->random_signal) | |
3546 | { | |
6c95b8df PA |
3547 | ptid_t parent; |
3548 | ptid_t child; | |
e58b0e63 | 3549 | int should_resume; |
3e43a32a MS |
3550 | int follow_child |
3551 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 3552 | |
16c381f0 | 3553 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; |
e58b0e63 PA |
3554 | |
3555 | should_resume = follow_fork (); | |
3556 | ||
6c95b8df PA |
3557 | parent = ecs->ptid; |
3558 | child = ecs->ws.value.related_pid; | |
3559 | ||
3560 | /* In non-stop mode, also resume the other branch. */ | |
3561 | if (non_stop && !detach_fork) | |
3562 | { | |
3563 | if (follow_child) | |
3564 | switch_to_thread (parent); | |
3565 | else | |
3566 | switch_to_thread (child); | |
3567 | ||
3568 | ecs->event_thread = inferior_thread (); | |
3569 | ecs->ptid = inferior_ptid; | |
3570 | keep_going (ecs); | |
3571 | } | |
3572 | ||
3573 | if (follow_child) | |
3574 | switch_to_thread (child); | |
3575 | else | |
3576 | switch_to_thread (parent); | |
3577 | ||
e58b0e63 PA |
3578 | ecs->event_thread = inferior_thread (); |
3579 | ecs->ptid = inferior_ptid; | |
3580 | ||
3581 | if (should_resume) | |
3582 | keep_going (ecs); | |
3583 | else | |
3584 | stop_stepping (ecs); | |
04e68871 DJ |
3585 | return; |
3586 | } | |
16c381f0 | 3587 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_TRAP; |
488f131b JB |
3588 | goto process_event_stop_test; |
3589 | ||
6c95b8df PA |
3590 | case TARGET_WAITKIND_VFORK_DONE: |
3591 | /* Done with the shared memory region. Re-insert breakpoints in | |
3592 | the parent, and keep going. */ | |
3593 | ||
3594 | if (debug_infrun) | |
3e43a32a MS |
3595 | fprintf_unfiltered (gdb_stdlog, |
3596 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
6c95b8df PA |
3597 | |
3598 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3599 | context_switch (ecs->ptid); | |
3600 | ||
3601 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 3602 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
6c95b8df PA |
3603 | /* This also takes care of reinserting breakpoints in the |
3604 | previously locked inferior. */ | |
3605 | keep_going (ecs); | |
3606 | return; | |
3607 | ||
488f131b | 3608 | case TARGET_WAITKIND_EXECD: |
527159b7 | 3609 | if (debug_infrun) |
fc5261f2 | 3610 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 3611 | |
5a2901d9 DJ |
3612 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3613 | { | |
0d1e5fa7 | 3614 | context_switch (ecs->ptid); |
35f196d9 | 3615 | reinit_frame_cache (); |
5a2901d9 DJ |
3616 | } |
3617 | ||
d03285ec UW |
3618 | singlestep_breakpoints_inserted_p = 0; |
3619 | cancel_single_step_breakpoints (); | |
3620 | ||
fb14de7b | 3621 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
795e548f | 3622 | |
6c95b8df PA |
3623 | /* Do whatever is necessary to the parent branch of the vfork. */ |
3624 | handle_vfork_child_exec_or_exit (1); | |
3625 | ||
795e548f PA |
3626 | /* This causes the eventpoints and symbol table to be reset. |
3627 | Must do this now, before trying to determine whether to | |
3628 | stop. */ | |
71b43ef8 | 3629 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 3630 | |
16c381f0 | 3631 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 3632 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 3633 | stop_pc, ecs->ptid, &ecs->ws); |
16c381f0 JK |
3634 | ecs->random_signal |
3635 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat); | |
795e548f | 3636 | |
71b43ef8 PA |
3637 | /* Note that this may be referenced from inside |
3638 | bpstat_stop_status above, through inferior_has_execd. */ | |
3639 | xfree (ecs->ws.value.execd_pathname); | |
3640 | ecs->ws.value.execd_pathname = NULL; | |
3641 | ||
04e68871 DJ |
3642 | /* If no catchpoint triggered for this, then keep going. */ |
3643 | if (ecs->random_signal) | |
3644 | { | |
16c381f0 | 3645 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; |
04e68871 DJ |
3646 | keep_going (ecs); |
3647 | return; | |
3648 | } | |
16c381f0 | 3649 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_TRAP; |
488f131b JB |
3650 | goto process_event_stop_test; |
3651 | ||
b4dc5ffa MK |
3652 | /* Be careful not to try to gather much state about a thread |
3653 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 3654 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 3655 | if (debug_infrun) |
3e43a32a MS |
3656 | fprintf_unfiltered (gdb_stdlog, |
3657 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
1777feb0 | 3658 | /* Getting the current syscall number. */ |
ca2163eb | 3659 | if (handle_syscall_event (ecs) != 0) |
a96d9b2e SDJ |
3660 | return; |
3661 | goto process_event_stop_test; | |
c906108c | 3662 | |
488f131b JB |
3663 | /* Before examining the threads further, step this thread to |
3664 | get it entirely out of the syscall. (We get notice of the | |
3665 | event when the thread is just on the verge of exiting a | |
3666 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 3667 | into user code.) */ |
488f131b | 3668 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 3669 | if (debug_infrun) |
3e43a32a MS |
3670 | fprintf_unfiltered (gdb_stdlog, |
3671 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
ca2163eb | 3672 | if (handle_syscall_event (ecs) != 0) |
a96d9b2e SDJ |
3673 | return; |
3674 | goto process_event_stop_test; | |
c906108c | 3675 | |
488f131b | 3676 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 3677 | if (debug_infrun) |
8a9de0e4 | 3678 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
16c381f0 | 3679 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
488f131b | 3680 | break; |
c906108c | 3681 | |
b2175913 | 3682 | case TARGET_WAITKIND_NO_HISTORY: |
4b4e080e PA |
3683 | if (debug_infrun) |
3684 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
b2175913 | 3685 | /* Reverse execution: target ran out of history info. */ |
fb14de7b | 3686 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
33d62d64 | 3687 | print_no_history_reason (); |
b2175913 MS |
3688 | stop_stepping (ecs); |
3689 | return; | |
488f131b | 3690 | } |
c906108c | 3691 | |
488f131b JB |
3692 | if (ecs->new_thread_event) |
3693 | { | |
94cc34af PA |
3694 | if (non_stop) |
3695 | /* Non-stop assumes that the target handles adding new threads | |
3696 | to the thread list. */ | |
3e43a32a MS |
3697 | internal_error (__FILE__, __LINE__, |
3698 | "targets should add new threads to the thread " | |
3699 | "list themselves in non-stop mode."); | |
94cc34af PA |
3700 | |
3701 | /* We may want to consider not doing a resume here in order to | |
3702 | give the user a chance to play with the new thread. It might | |
3703 | be good to make that a user-settable option. */ | |
3704 | ||
3705 | /* At this point, all threads are stopped (happens automatically | |
3706 | in either the OS or the native code). Therefore we need to | |
3707 | continue all threads in order to make progress. */ | |
3708 | ||
173853dc PA |
3709 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3710 | context_switch (ecs->ptid); | |
488f131b JB |
3711 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); |
3712 | prepare_to_wait (ecs); | |
3713 | return; | |
3714 | } | |
c906108c | 3715 | |
2020b7ab | 3716 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED) |
252fbfc8 PA |
3717 | { |
3718 | /* Do we need to clean up the state of a thread that has | |
3719 | completed a displaced single-step? (Doing so usually affects | |
3720 | the PC, so do it here, before we set stop_pc.) */ | |
16c381f0 JK |
3721 | displaced_step_fixup (ecs->ptid, |
3722 | ecs->event_thread->suspend.stop_signal); | |
252fbfc8 PA |
3723 | |
3724 | /* If we either finished a single-step or hit a breakpoint, but | |
3725 | the user wanted this thread to be stopped, pretend we got a | |
3726 | SIG0 (generic unsignaled stop). */ | |
3727 | ||
3728 | if (ecs->event_thread->stop_requested | |
16c381f0 JK |
3729 | && ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP) |
3730 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; | |
252fbfc8 | 3731 | } |
237fc4c9 | 3732 | |
515630c5 | 3733 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 3734 | |
527159b7 | 3735 | if (debug_infrun) |
237fc4c9 | 3736 | { |
5af949e3 UW |
3737 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
3738 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7f82dfc7 JK |
3739 | struct cleanup *old_chain = save_inferior_ptid (); |
3740 | ||
3741 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
3742 | |
3743 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
3744 | paddress (gdbarch, stop_pc)); | |
d92524f1 | 3745 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
3746 | { |
3747 | CORE_ADDR addr; | |
abbb1732 | 3748 | |
237fc4c9 PA |
3749 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
3750 | ||
3751 | if (target_stopped_data_address (¤t_target, &addr)) | |
3752 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
3753 | "infrun: stopped data address = %s\n", |
3754 | paddress (gdbarch, addr)); | |
237fc4c9 PA |
3755 | else |
3756 | fprintf_unfiltered (gdb_stdlog, | |
3757 | "infrun: (no data address available)\n"); | |
3758 | } | |
7f82dfc7 JK |
3759 | |
3760 | do_cleanups (old_chain); | |
237fc4c9 | 3761 | } |
527159b7 | 3762 | |
9f976b41 DJ |
3763 | if (stepping_past_singlestep_breakpoint) |
3764 | { | |
1c0fdd0e | 3765 | gdb_assert (singlestep_breakpoints_inserted_p); |
9f976b41 DJ |
3766 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
3767 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
3768 | ||
3769 | stepping_past_singlestep_breakpoint = 0; | |
3770 | ||
3771 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
3772 | breakpoint, or stopped for some other reason. It would be nice if |
3773 | we could tell, but we can't reliably. */ | |
16c381f0 | 3774 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP) |
8fb3e588 | 3775 | { |
527159b7 | 3776 | if (debug_infrun) |
3e43a32a MS |
3777 | fprintf_unfiltered (gdb_stdlog, |
3778 | "infrun: stepping_past_" | |
3779 | "singlestep_breakpoint\n"); | |
9f976b41 | 3780 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 3781 | remove_single_step_breakpoints (); |
9f976b41 DJ |
3782 | singlestep_breakpoints_inserted_p = 0; |
3783 | ||
3784 | ecs->random_signal = 0; | |
16c381f0 | 3785 | ecs->event_thread->control.trap_expected = 0; |
9f976b41 | 3786 | |
0d1e5fa7 | 3787 | context_switch (saved_singlestep_ptid); |
9a4105ab AC |
3788 | if (deprecated_context_hook) |
3789 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
3790 | |
3791 | resume (1, TARGET_SIGNAL_0); | |
3792 | prepare_to_wait (ecs); | |
3793 | return; | |
3794 | } | |
3795 | } | |
3796 | ||
ca67fcb8 | 3797 | if (!ptid_equal (deferred_step_ptid, null_ptid)) |
6a6b96b9 | 3798 | { |
94cc34af PA |
3799 | /* In non-stop mode, there's never a deferred_step_ptid set. */ |
3800 | gdb_assert (!non_stop); | |
3801 | ||
6a6b96b9 UW |
3802 | /* If we stopped for some other reason than single-stepping, ignore |
3803 | the fact that we were supposed to switch back. */ | |
16c381f0 | 3804 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP) |
6a6b96b9 UW |
3805 | { |
3806 | if (debug_infrun) | |
3807 | fprintf_unfiltered (gdb_stdlog, | |
ca67fcb8 | 3808 | "infrun: handling deferred step\n"); |
6a6b96b9 UW |
3809 | |
3810 | /* Pull the single step breakpoints out of the target. */ | |
3811 | if (singlestep_breakpoints_inserted_p) | |
3812 | { | |
3813 | remove_single_step_breakpoints (); | |
3814 | singlestep_breakpoints_inserted_p = 0; | |
3815 | } | |
3816 | ||
cd3da28e PA |
3817 | ecs->event_thread->control.trap_expected = 0; |
3818 | ||
6a6b96b9 UW |
3819 | /* Note: We do not call context_switch at this point, as the |
3820 | context is already set up for stepping the original thread. */ | |
ca67fcb8 VP |
3821 | switch_to_thread (deferred_step_ptid); |
3822 | deferred_step_ptid = null_ptid; | |
6a6b96b9 UW |
3823 | /* Suppress spurious "Switching to ..." message. */ |
3824 | previous_inferior_ptid = inferior_ptid; | |
3825 | ||
3826 | resume (1, TARGET_SIGNAL_0); | |
3827 | prepare_to_wait (ecs); | |
3828 | return; | |
3829 | } | |
ca67fcb8 VP |
3830 | |
3831 | deferred_step_ptid = null_ptid; | |
6a6b96b9 UW |
3832 | } |
3833 | ||
488f131b JB |
3834 | /* See if a thread hit a thread-specific breakpoint that was meant for |
3835 | another thread. If so, then step that thread past the breakpoint, | |
3836 | and continue it. */ | |
3837 | ||
16c381f0 | 3838 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP) |
488f131b | 3839 | { |
9f976b41 | 3840 | int thread_hop_needed = 0; |
cf00dfa7 VP |
3841 | struct address_space *aspace = |
3842 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
9f976b41 | 3843 | |
f8d40ec8 | 3844 | /* Check if a regular breakpoint has been hit before checking |
1777feb0 | 3845 | for a potential single step breakpoint. Otherwise, GDB will |
f8d40ec8 | 3846 | not see this breakpoint hit when stepping onto breakpoints. */ |
6c95b8df | 3847 | if (regular_breakpoint_inserted_here_p (aspace, stop_pc)) |
488f131b | 3848 | { |
c5aa993b | 3849 | ecs->random_signal = 0; |
6c95b8df | 3850 | if (!breakpoint_thread_match (aspace, stop_pc, ecs->ptid)) |
9f976b41 DJ |
3851 | thread_hop_needed = 1; |
3852 | } | |
1c0fdd0e | 3853 | else if (singlestep_breakpoints_inserted_p) |
9f976b41 | 3854 | { |
fd48f117 DJ |
3855 | /* We have not context switched yet, so this should be true |
3856 | no matter which thread hit the singlestep breakpoint. */ | |
3857 | gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid)); | |
3858 | if (debug_infrun) | |
3859 | fprintf_unfiltered (gdb_stdlog, "infrun: software single step " | |
3860 | "trap for %s\n", | |
3861 | target_pid_to_str (ecs->ptid)); | |
3862 | ||
9f976b41 DJ |
3863 | ecs->random_signal = 0; |
3864 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
3865 | change when we go from single-threaded to multi-threaded. If | |
3866 | the singlestep_ptid is still in the list, assume that it is | |
3867 | really different from ecs->ptid. */ | |
3868 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
3869 | && in_thread_list (singlestep_ptid)) | |
3870 | { | |
fd48f117 DJ |
3871 | /* If the PC of the thread we were trying to single-step |
3872 | has changed, discard this event (which we were going | |
3873 | to ignore anyway), and pretend we saw that thread | |
3874 | trap. This prevents us continuously moving the | |
3875 | single-step breakpoint forward, one instruction at a | |
3876 | time. If the PC has changed, then the thread we were | |
3877 | trying to single-step has trapped or been signalled, | |
3878 | but the event has not been reported to GDB yet. | |
3879 | ||
3880 | There might be some cases where this loses signal | |
3881 | information, if a signal has arrived at exactly the | |
3882 | same time that the PC changed, but this is the best | |
3883 | we can do with the information available. Perhaps we | |
3884 | should arrange to report all events for all threads | |
3885 | when they stop, or to re-poll the remote looking for | |
3886 | this particular thread (i.e. temporarily enable | |
3887 | schedlock). */ | |
515630c5 UW |
3888 | |
3889 | CORE_ADDR new_singlestep_pc | |
3890 | = regcache_read_pc (get_thread_regcache (singlestep_ptid)); | |
3891 | ||
3892 | if (new_singlestep_pc != singlestep_pc) | |
fd48f117 | 3893 | { |
2020b7ab PA |
3894 | enum target_signal stop_signal; |
3895 | ||
fd48f117 DJ |
3896 | if (debug_infrun) |
3897 | fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread," | |
3898 | " but expected thread advanced also\n"); | |
3899 | ||
3900 | /* The current context still belongs to | |
3901 | singlestep_ptid. Don't swap here, since that's | |
3902 | the context we want to use. Just fudge our | |
3903 | state and continue. */ | |
16c381f0 JK |
3904 | stop_signal = ecs->event_thread->suspend.stop_signal; |
3905 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; | |
fd48f117 | 3906 | ecs->ptid = singlestep_ptid; |
e09875d4 | 3907 | ecs->event_thread = find_thread_ptid (ecs->ptid); |
16c381f0 | 3908 | ecs->event_thread->suspend.stop_signal = stop_signal; |
515630c5 | 3909 | stop_pc = new_singlestep_pc; |
fd48f117 DJ |
3910 | } |
3911 | else | |
3912 | { | |
3913 | if (debug_infrun) | |
3914 | fprintf_unfiltered (gdb_stdlog, | |
3915 | "infrun: unexpected thread\n"); | |
3916 | ||
3917 | thread_hop_needed = 1; | |
3918 | stepping_past_singlestep_breakpoint = 1; | |
3919 | saved_singlestep_ptid = singlestep_ptid; | |
3920 | } | |
9f976b41 DJ |
3921 | } |
3922 | } | |
3923 | ||
3924 | if (thread_hop_needed) | |
8fb3e588 | 3925 | { |
9f5a595d | 3926 | struct regcache *thread_regcache; |
237fc4c9 | 3927 | int remove_status = 0; |
8fb3e588 | 3928 | |
527159b7 | 3929 | if (debug_infrun) |
8a9de0e4 | 3930 | fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); |
527159b7 | 3931 | |
b3444185 PA |
3932 | /* Switch context before touching inferior memory, the |
3933 | previous thread may have exited. */ | |
3934 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
3935 | context_switch (ecs->ptid); | |
3936 | ||
8fb3e588 | 3937 | /* Saw a breakpoint, but it was hit by the wrong thread. |
1777feb0 | 3938 | Just continue. */ |
8fb3e588 | 3939 | |
1c0fdd0e | 3940 | if (singlestep_breakpoints_inserted_p) |
488f131b | 3941 | { |
1777feb0 | 3942 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 3943 | remove_single_step_breakpoints (); |
8fb3e588 AC |
3944 | singlestep_breakpoints_inserted_p = 0; |
3945 | } | |
3946 | ||
237fc4c9 PA |
3947 | /* If the arch can displace step, don't remove the |
3948 | breakpoints. */ | |
9f5a595d UW |
3949 | thread_regcache = get_thread_regcache (ecs->ptid); |
3950 | if (!use_displaced_stepping (get_regcache_arch (thread_regcache))) | |
237fc4c9 PA |
3951 | remove_status = remove_breakpoints (); |
3952 | ||
8fb3e588 AC |
3953 | /* Did we fail to remove breakpoints? If so, try |
3954 | to set the PC past the bp. (There's at least | |
3955 | one situation in which we can fail to remove | |
3956 | the bp's: On HP-UX's that use ttrace, we can't | |
3957 | change the address space of a vforking child | |
3958 | process until the child exits (well, okay, not | |
1777feb0 | 3959 | then either :-) or execs. */ |
8fb3e588 | 3960 | if (remove_status != 0) |
9d9cd7ac | 3961 | error (_("Cannot step over breakpoint hit in wrong thread")); |
8fb3e588 AC |
3962 | else |
3963 | { /* Single step */ | |
94cc34af PA |
3964 | if (!non_stop) |
3965 | { | |
3966 | /* Only need to require the next event from this | |
3967 | thread in all-stop mode. */ | |
3968 | waiton_ptid = ecs->ptid; | |
3969 | infwait_state = infwait_thread_hop_state; | |
3970 | } | |
8fb3e588 | 3971 | |
4e1c45ea | 3972 | ecs->event_thread->stepping_over_breakpoint = 1; |
8fb3e588 | 3973 | keep_going (ecs); |
8fb3e588 AC |
3974 | return; |
3975 | } | |
488f131b | 3976 | } |
1c0fdd0e | 3977 | else if (singlestep_breakpoints_inserted_p) |
8fb3e588 | 3978 | { |
8fb3e588 AC |
3979 | ecs->random_signal = 0; |
3980 | } | |
488f131b JB |
3981 | } |
3982 | else | |
3983 | ecs->random_signal = 1; | |
c906108c | 3984 | |
488f131b | 3985 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
3986 | so, then switch to that thread. */ |
3987 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 3988 | { |
527159b7 | 3989 | if (debug_infrun) |
8a9de0e4 | 3990 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 3991 | |
0d1e5fa7 | 3992 | context_switch (ecs->ptid); |
c5aa993b | 3993 | |
9a4105ab AC |
3994 | if (deprecated_context_hook) |
3995 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 3996 | } |
c906108c | 3997 | |
568d6575 UW |
3998 | /* At this point, get hold of the now-current thread's frame. */ |
3999 | frame = get_current_frame (); | |
4000 | gdbarch = get_frame_arch (frame); | |
4001 | ||
1c0fdd0e | 4002 | if (singlestep_breakpoints_inserted_p) |
488f131b | 4003 | { |
1777feb0 | 4004 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 4005 | remove_single_step_breakpoints (); |
488f131b JB |
4006 | singlestep_breakpoints_inserted_p = 0; |
4007 | } | |
c906108c | 4008 | |
d983da9c DJ |
4009 | if (stepped_after_stopped_by_watchpoint) |
4010 | stopped_by_watchpoint = 0; | |
4011 | else | |
4012 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
4013 | ||
4014 | /* If necessary, step over this watchpoint. We'll be back to display | |
4015 | it in a moment. */ | |
4016 | if (stopped_by_watchpoint | |
d92524f1 | 4017 | && (target_have_steppable_watchpoint |
568d6575 | 4018 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 4019 | { |
488f131b JB |
4020 | /* At this point, we are stopped at an instruction which has |
4021 | attempted to write to a piece of memory under control of | |
4022 | a watchpoint. The instruction hasn't actually executed | |
4023 | yet. If we were to evaluate the watchpoint expression | |
4024 | now, we would get the old value, and therefore no change | |
4025 | would seem to have occurred. | |
4026 | ||
4027 | In order to make watchpoints work `right', we really need | |
4028 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
4029 | watchpoint expression. We do this by single-stepping the |
4030 | target. | |
4031 | ||
4032 | It may not be necessary to disable the watchpoint to stop over | |
4033 | it. For example, the PA can (with some kernel cooperation) | |
4034 | single step over a watchpoint without disabling the watchpoint. | |
4035 | ||
4036 | It is far more common to need to disable a watchpoint to step | |
4037 | the inferior over it. If we have non-steppable watchpoints, | |
4038 | we must disable the current watchpoint; it's simplest to | |
4039 | disable all watchpoints and breakpoints. */ | |
2facfe5c DD |
4040 | int hw_step = 1; |
4041 | ||
d92524f1 | 4042 | if (!target_have_steppable_watchpoint) |
2455069d UW |
4043 | { |
4044 | remove_breakpoints (); | |
4045 | /* See comment in resume why we need to stop bypassing signals | |
4046 | while breakpoints have been removed. */ | |
4047 | target_pass_signals (0, NULL); | |
4048 | } | |
2facfe5c | 4049 | /* Single step */ |
568d6575 | 4050 | hw_step = maybe_software_singlestep (gdbarch, stop_pc); |
2facfe5c | 4051 | target_resume (ecs->ptid, hw_step, TARGET_SIGNAL_0); |
0d1e5fa7 | 4052 | waiton_ptid = ecs->ptid; |
d92524f1 | 4053 | if (target_have_steppable_watchpoint) |
0d1e5fa7 | 4054 | infwait_state = infwait_step_watch_state; |
d983da9c | 4055 | else |
0d1e5fa7 | 4056 | infwait_state = infwait_nonstep_watch_state; |
488f131b JB |
4057 | prepare_to_wait (ecs); |
4058 | return; | |
4059 | } | |
4060 | ||
7e324e48 | 4061 | clear_stop_func (ecs); |
4e1c45ea | 4062 | ecs->event_thread->stepping_over_breakpoint = 0; |
16c381f0 JK |
4063 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
4064 | ecs->event_thread->control.stop_step = 0; | |
488f131b JB |
4065 | stop_print_frame = 1; |
4066 | ecs->random_signal = 0; | |
4067 | stopped_by_random_signal = 0; | |
488f131b | 4068 | |
edb3359d DJ |
4069 | /* Hide inlined functions starting here, unless we just performed stepi or |
4070 | nexti. After stepi and nexti, always show the innermost frame (not any | |
4071 | inline function call sites). */ | |
16c381f0 | 4072 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f GB |
4073 | { |
4074 | struct address_space *aspace = | |
4075 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
4076 | ||
4077 | /* skip_inline_frames is expensive, so we avoid it if we can | |
4078 | determine that the address is one where functions cannot have | |
4079 | been inlined. This improves performance with inferiors that | |
4080 | load a lot of shared libraries, because the solib event | |
4081 | breakpoint is defined as the address of a function (i.e. not | |
4082 | inline). Note that we have to check the previous PC as well | |
4083 | as the current one to catch cases when we have just | |
4084 | single-stepped off a breakpoint prior to reinstating it. | |
4085 | Note that we're assuming that the code we single-step to is | |
4086 | not inline, but that's not definitive: there's nothing | |
4087 | preventing the event breakpoint function from containing | |
4088 | inlined code, and the single-step ending up there. If the | |
4089 | user had set a breakpoint on that inlined code, the missing | |
4090 | skip_inline_frames call would break things. Fortunately | |
4091 | that's an extremely unlikely scenario. */ | |
09ac7c10 | 4092 | if (!pc_at_non_inline_function (aspace, stop_pc, &ecs->ws) |
0574c78f GB |
4093 | && !(ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP |
4094 | && ecs->event_thread->control.trap_expected | |
4095 | && pc_at_non_inline_function (aspace, | |
09ac7c10 TT |
4096 | ecs->event_thread->prev_pc, |
4097 | &ecs->ws))) | |
0574c78f GB |
4098 | skip_inline_frames (ecs->ptid); |
4099 | } | |
edb3359d | 4100 | |
16c381f0 JK |
4101 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP |
4102 | && ecs->event_thread->control.trap_expected | |
568d6575 | 4103 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 4104 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 4105 | { |
b50d7442 | 4106 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 4107 | also on an instruction that needs to be stepped multiple |
1777feb0 | 4108 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
4109 | with a delay slot. It needs to be stepped twice, once for |
4110 | the instruction and once for the delay slot. */ | |
4111 | int step_through_delay | |
568d6575 | 4112 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 4113 | |
527159b7 | 4114 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 4115 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
4116 | if (ecs->event_thread->control.step_range_end == 0 |
4117 | && step_through_delay) | |
3352ef37 AC |
4118 | { |
4119 | /* The user issued a continue when stopped at a breakpoint. | |
4120 | Set up for another trap and get out of here. */ | |
4e1c45ea | 4121 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
4122 | keep_going (ecs); |
4123 | return; | |
4124 | } | |
4125 | else if (step_through_delay) | |
4126 | { | |
4127 | /* The user issued a step when stopped at a breakpoint. | |
4128 | Maybe we should stop, maybe we should not - the delay | |
4129 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
4130 | case, don't decide that here, just set |
4131 | ecs->stepping_over_breakpoint, making sure we | |
4132 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 4133 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
4134 | } |
4135 | } | |
4136 | ||
488f131b JB |
4137 | /* Look at the cause of the stop, and decide what to do. |
4138 | The alternatives are: | |
0d1e5fa7 PA |
4139 | 1) stop_stepping and return; to really stop and return to the debugger, |
4140 | 2) keep_going and return to start up again | |
4e1c45ea | 4141 | (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once) |
488f131b JB |
4142 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 |
4143 | will be made according to the signal handling tables. */ | |
4144 | ||
16c381f0 | 4145 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP |
b0f4b84b DJ |
4146 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP |
4147 | || stop_soon == STOP_QUIETLY_REMOTE) | |
488f131b | 4148 | { |
16c381f0 JK |
4149 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP |
4150 | && stop_after_trap) | |
488f131b | 4151 | { |
527159b7 | 4152 | if (debug_infrun) |
8a9de0e4 | 4153 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); |
488f131b JB |
4154 | stop_print_frame = 0; |
4155 | stop_stepping (ecs); | |
4156 | return; | |
4157 | } | |
c54cfec8 EZ |
4158 | |
4159 | /* This is originated from start_remote(), start_inferior() and | |
4160 | shared libraries hook functions. */ | |
b0f4b84b | 4161 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
488f131b | 4162 | { |
527159b7 | 4163 | if (debug_infrun) |
8a9de0e4 | 4164 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); |
488f131b JB |
4165 | stop_stepping (ecs); |
4166 | return; | |
4167 | } | |
4168 | ||
c54cfec8 | 4169 | /* This originates from attach_command(). We need to overwrite |
a0d21d28 PA |
4170 | the stop_signal here, because some kernels don't ignore a |
4171 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
4172 | See more comments in inferior.h. On the other hand, if we | |
a0ef4274 | 4173 | get a non-SIGSTOP, report it to the user - assume the backend |
a0d21d28 PA |
4174 | will handle the SIGSTOP if it should show up later. |
4175 | ||
4176 | Also consider that the attach is complete when we see a | |
4177 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
4178 | target extended-remote report it instead of a SIGSTOP | |
4179 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
e0ba6746 PA |
4180 | signal, so this is no exception. |
4181 | ||
4182 | Also consider that the attach is complete when we see a | |
4183 | TARGET_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
4184 | the target to stop all threads of the inferior, in case the | |
4185 | low level attach operation doesn't stop them implicitly. If | |
4186 | they weren't stopped implicitly, then the stub will report a | |
4187 | TARGET_SIGNAL_0, meaning: stopped for no particular reason | |
4188 | other than GDB's request. */ | |
a0ef4274 | 4189 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP |
16c381f0 JK |
4190 | && (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_STOP |
4191 | || ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP | |
4192 | || ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_0)) | |
c54cfec8 EZ |
4193 | { |
4194 | stop_stepping (ecs); | |
16c381f0 | 4195 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; |
c54cfec8 EZ |
4196 | return; |
4197 | } | |
4198 | ||
09ac7c10 TT |
4199 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
4200 | handles this event. */ | |
16c381f0 | 4201 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4202 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 4203 | stop_pc, ecs->ptid, &ecs->ws); |
6c95b8df | 4204 | |
fba57f8f VP |
4205 | /* Following in case break condition called a |
4206 | function. */ | |
4207 | stop_print_frame = 1; | |
488f131b | 4208 | |
db82e815 PA |
4209 | /* This is where we handle "moribund" watchpoints. Unlike |
4210 | software breakpoints traps, hardware watchpoint traps are | |
4211 | always distinguishable from random traps. If no high-level | |
4212 | watchpoint is associated with the reported stop data address | |
4213 | anymore, then the bpstat does not explain the signal --- | |
4214 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
4215 | set. */ | |
4216 | ||
4217 | if (debug_infrun | |
16c381f0 JK |
4218 | && ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP |
4219 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat) | |
db82e815 | 4220 | && stopped_by_watchpoint) |
3e43a32a MS |
4221 | fprintf_unfiltered (gdb_stdlog, |
4222 | "infrun: no user watchpoint explains " | |
4223 | "watchpoint SIGTRAP, ignoring\n"); | |
db82e815 | 4224 | |
73dd234f | 4225 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
4226 | at one stage in the past included checks for an inferior |
4227 | function call's call dummy's return breakpoint. The original | |
4228 | comment, that went with the test, read: | |
73dd234f | 4229 | |
8fb3e588 AC |
4230 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
4231 | another signal besides SIGTRAP, so check here as well as | |
4232 | above.'' | |
73dd234f | 4233 | |
8002d778 | 4234 | If someone ever tries to get call dummys on a |
73dd234f | 4235 | non-executable stack to work (where the target would stop |
03cebad2 MK |
4236 | with something like a SIGSEGV), then those tests might need |
4237 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 4238 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
4239 | suspect that it won't be the case. |
4240 | ||
8fb3e588 AC |
4241 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
4242 | be necessary for call dummies on a non-executable stack on | |
4243 | SPARC. */ | |
73dd234f | 4244 | |
16c381f0 | 4245 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP) |
488f131b | 4246 | ecs->random_signal |
16c381f0 | 4247 | = !(bpstat_explains_signal (ecs->event_thread->control.stop_bpstat) |
db82e815 | 4248 | || stopped_by_watchpoint |
16c381f0 JK |
4249 | || ecs->event_thread->control.trap_expected |
4250 | || (ecs->event_thread->control.step_range_end | |
8358c15c JK |
4251 | && (ecs->event_thread->control.step_resume_breakpoint |
4252 | == NULL))); | |
488f131b JB |
4253 | else |
4254 | { | |
16c381f0 JK |
4255 | ecs->random_signal = !bpstat_explains_signal |
4256 | (ecs->event_thread->control.stop_bpstat); | |
488f131b | 4257 | if (!ecs->random_signal) |
16c381f0 | 4258 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_TRAP; |
488f131b JB |
4259 | } |
4260 | } | |
4261 | ||
4262 | /* When we reach this point, we've pretty much decided | |
4263 | that the reason for stopping must've been a random | |
1777feb0 | 4264 | (unexpected) signal. */ |
488f131b JB |
4265 | |
4266 | else | |
4267 | ecs->random_signal = 1; | |
488f131b | 4268 | |
04e68871 | 4269 | process_event_stop_test: |
568d6575 UW |
4270 | |
4271 | /* Re-fetch current thread's frame in case we did a | |
4272 | "goto process_event_stop_test" above. */ | |
4273 | frame = get_current_frame (); | |
4274 | gdbarch = get_frame_arch (frame); | |
4275 | ||
488f131b JB |
4276 | /* For the program's own signals, act according to |
4277 | the signal handling tables. */ | |
4278 | ||
4279 | if (ecs->random_signal) | |
4280 | { | |
4281 | /* Signal not for debugging purposes. */ | |
4282 | int printed = 0; | |
24291992 | 4283 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); |
488f131b | 4284 | |
527159b7 | 4285 | if (debug_infrun) |
2020b7ab | 4286 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", |
16c381f0 | 4287 | ecs->event_thread->suspend.stop_signal); |
527159b7 | 4288 | |
488f131b JB |
4289 | stopped_by_random_signal = 1; |
4290 | ||
16c381f0 | 4291 | if (signal_print[ecs->event_thread->suspend.stop_signal]) |
488f131b JB |
4292 | { |
4293 | printed = 1; | |
4294 | target_terminal_ours_for_output (); | |
16c381f0 JK |
4295 | print_signal_received_reason |
4296 | (ecs->event_thread->suspend.stop_signal); | |
488f131b | 4297 | } |
252fbfc8 PA |
4298 | /* Always stop on signals if we're either just gaining control |
4299 | of the program, or the user explicitly requested this thread | |
4300 | to remain stopped. */ | |
d6b48e9c | 4301 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 4302 | || ecs->event_thread->stop_requested |
24291992 | 4303 | || (!inf->detaching |
16c381f0 | 4304 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b JB |
4305 | { |
4306 | stop_stepping (ecs); | |
4307 | return; | |
4308 | } | |
4309 | /* If not going to stop, give terminal back | |
4310 | if we took it away. */ | |
4311 | else if (printed) | |
4312 | target_terminal_inferior (); | |
4313 | ||
4314 | /* Clear the signal if it should not be passed. */ | |
16c381f0 JK |
4315 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
4316 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; | |
488f131b | 4317 | |
fb14de7b | 4318 | if (ecs->event_thread->prev_pc == stop_pc |
16c381f0 | 4319 | && ecs->event_thread->control.trap_expected |
8358c15c | 4320 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
4321 | { |
4322 | /* We were just starting a new sequence, attempting to | |
4323 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 4324 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
4325 | of the stepping range so GDB needs to remember to, when |
4326 | the signal handler returns, resume stepping off that | |
4327 | breakpoint. */ | |
4328 | /* To simplify things, "continue" is forced to use the same | |
4329 | code paths as single-step - set a breakpoint at the | |
4330 | signal return address and then, once hit, step off that | |
4331 | breakpoint. */ | |
237fc4c9 PA |
4332 | if (debug_infrun) |
4333 | fprintf_unfiltered (gdb_stdlog, | |
4334 | "infrun: signal arrived while stepping over " | |
4335 | "breakpoint\n"); | |
d3169d93 | 4336 | |
2c03e5be | 4337 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 4338 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
4339 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
4340 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
4341 | keep_going (ecs); |
4342 | return; | |
68f53502 | 4343 | } |
9d799f85 | 4344 | |
16c381f0 JK |
4345 | if (ecs->event_thread->control.step_range_end != 0 |
4346 | && ecs->event_thread->suspend.stop_signal != TARGET_SIGNAL_0 | |
4347 | && (ecs->event_thread->control.step_range_start <= stop_pc | |
4348 | && stop_pc < ecs->event_thread->control.step_range_end) | |
edb3359d | 4349 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 4350 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 4351 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
4352 | { |
4353 | /* The inferior is about to take a signal that will take it | |
4354 | out of the single step range. Set a breakpoint at the | |
4355 | current PC (which is presumably where the signal handler | |
4356 | will eventually return) and then allow the inferior to | |
4357 | run free. | |
4358 | ||
4359 | Note that this is only needed for a signal delivered | |
4360 | while in the single-step range. Nested signals aren't a | |
4361 | problem as they eventually all return. */ | |
237fc4c9 PA |
4362 | if (debug_infrun) |
4363 | fprintf_unfiltered (gdb_stdlog, | |
4364 | "infrun: signal may take us out of " | |
4365 | "single-step range\n"); | |
4366 | ||
2c03e5be | 4367 | insert_hp_step_resume_breakpoint_at_frame (frame); |
2455069d UW |
4368 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
4369 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
4370 | keep_going (ecs); |
4371 | return; | |
d303a6c7 | 4372 | } |
9d799f85 AC |
4373 | |
4374 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
4375 | when either there's a nested signal, or when there's a | |
4376 | pending signal enabled just as the signal handler returns | |
4377 | (leaving the inferior at the step-resume-breakpoint without | |
4378 | actually executing it). Either way continue until the | |
4379 | breakpoint is really hit. */ | |
488f131b JB |
4380 | keep_going (ecs); |
4381 | return; | |
4382 | } | |
4383 | ||
4384 | /* Handle cases caused by hitting a breakpoint. */ | |
4385 | { | |
4386 | CORE_ADDR jmp_buf_pc; | |
4387 | struct bpstat_what what; | |
4388 | ||
16c381f0 | 4389 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
488f131b JB |
4390 | |
4391 | if (what.call_dummy) | |
4392 | { | |
aa7d318d | 4393 | stop_stack_dummy = what.call_dummy; |
c5aa993b | 4394 | } |
c906108c | 4395 | |
628fe4e4 JK |
4396 | /* If we hit an internal event that triggers symbol changes, the |
4397 | current frame will be invalidated within bpstat_what (e.g., if | |
4398 | we hit an internal solib event). Re-fetch it. */ | |
4399 | frame = get_current_frame (); | |
4400 | gdbarch = get_frame_arch (frame); | |
4401 | ||
488f131b | 4402 | switch (what.main_action) |
c5aa993b | 4403 | { |
488f131b | 4404 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
611c83ae PA |
4405 | /* If we hit the breakpoint at longjmp while stepping, we |
4406 | install a momentary breakpoint at the target of the | |
4407 | jmp_buf. */ | |
4408 | ||
4409 | if (debug_infrun) | |
4410 | fprintf_unfiltered (gdb_stdlog, | |
4411 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
4412 | ||
4e1c45ea | 4413 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 4414 | |
186c406b | 4415 | if (what.is_longjmp) |
c5aa993b | 4416 | { |
186c406b TT |
4417 | if (!gdbarch_get_longjmp_target_p (gdbarch) |
4418 | || !gdbarch_get_longjmp_target (gdbarch, | |
4419 | frame, &jmp_buf_pc)) | |
4420 | { | |
4421 | if (debug_infrun) | |
3e43a32a MS |
4422 | fprintf_unfiltered (gdb_stdlog, |
4423 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
4424 | "(!gdbarch_get_longjmp_target)\n"); | |
186c406b TT |
4425 | keep_going (ecs); |
4426 | return; | |
4427 | } | |
488f131b | 4428 | |
186c406b TT |
4429 | /* We're going to replace the current step-resume breakpoint |
4430 | with a longjmp-resume breakpoint. */ | |
4431 | delete_step_resume_breakpoint (ecs->event_thread); | |
611c83ae | 4432 | |
186c406b TT |
4433 | /* Insert a breakpoint at resume address. */ |
4434 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
4435 | } | |
4436 | else | |
4437 | { | |
4438 | struct symbol *func = get_frame_function (frame); | |
c906108c | 4439 | |
186c406b TT |
4440 | if (func) |
4441 | check_exception_resume (ecs, frame, func); | |
4442 | } | |
488f131b JB |
4443 | keep_going (ecs); |
4444 | return; | |
c906108c | 4445 | |
488f131b | 4446 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
527159b7 | 4447 | if (debug_infrun) |
611c83ae PA |
4448 | fprintf_unfiltered (gdb_stdlog, |
4449 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
4450 | ||
186c406b TT |
4451 | if (what.is_longjmp) |
4452 | { | |
4453 | gdb_assert (ecs->event_thread->control.step_resume_breakpoint | |
4454 | != NULL); | |
4455 | delete_step_resume_breakpoint (ecs->event_thread); | |
4456 | } | |
4457 | else | |
4458 | { | |
4459 | /* There are several cases to consider. | |
4460 | ||
4461 | 1. The initiating frame no longer exists. In this case | |
4462 | we must stop, because the exception has gone too far. | |
4463 | ||
4464 | 2. The initiating frame exists, and is the same as the | |
4465 | current frame. We stop, because the exception has been | |
4466 | caught. | |
4467 | ||
4468 | 3. The initiating frame exists and is different from | |
4469 | the current frame. This means the exception has been | |
4470 | caught beneath the initiating frame, so keep going. */ | |
4471 | struct frame_info *init_frame | |
4472 | = frame_find_by_id (ecs->event_thread->initiating_frame); | |
4473 | ||
4474 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint | |
4475 | != NULL); | |
4476 | delete_exception_resume_breakpoint (ecs->event_thread); | |
4477 | ||
4478 | if (init_frame) | |
4479 | { | |
4480 | struct frame_id current_id | |
4481 | = get_frame_id (get_current_frame ()); | |
4482 | if (frame_id_eq (current_id, | |
4483 | ecs->event_thread->initiating_frame)) | |
4484 | { | |
4485 | /* Case 2. Fall through. */ | |
4486 | } | |
4487 | else | |
4488 | { | |
4489 | /* Case 3. */ | |
4490 | keep_going (ecs); | |
4491 | return; | |
4492 | } | |
4493 | } | |
4494 | ||
4495 | /* For Cases 1 and 2, remove the step-resume breakpoint, | |
4496 | if it exists. */ | |
4497 | delete_step_resume_breakpoint (ecs->event_thread); | |
4498 | } | |
611c83ae | 4499 | |
16c381f0 | 4500 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 4501 | print_end_stepping_range_reason (); |
611c83ae PA |
4502 | stop_stepping (ecs); |
4503 | return; | |
488f131b JB |
4504 | |
4505 | case BPSTAT_WHAT_SINGLE: | |
527159b7 | 4506 | if (debug_infrun) |
8802d8ed | 4507 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); |
4e1c45ea | 4508 | ecs->event_thread->stepping_over_breakpoint = 1; |
488f131b JB |
4509 | /* Still need to check other stuff, at least the case |
4510 | where we are stepping and step out of the right range. */ | |
4511 | break; | |
c906108c | 4512 | |
2c03e5be PA |
4513 | case BPSTAT_WHAT_STEP_RESUME: |
4514 | if (debug_infrun) | |
4515 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
4516 | ||
4517 | delete_step_resume_breakpoint (ecs->event_thread); | |
9da8c2a0 PA |
4518 | if (ecs->event_thread->control.proceed_to_finish |
4519 | && execution_direction == EXEC_REVERSE) | |
4520 | { | |
4521 | struct thread_info *tp = ecs->event_thread; | |
4522 | ||
4523 | /* We are finishing a function in reverse, and just hit | |
4524 | the step-resume breakpoint at the start address of the | |
4525 | function, and we're almost there -- just need to back | |
4526 | up by one more single-step, which should take us back | |
4527 | to the function call. */ | |
4528 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
4529 | keep_going (ecs); | |
4530 | return; | |
4531 | } | |
7e324e48 | 4532 | fill_in_stop_func (gdbarch, ecs); |
2c03e5be PA |
4533 | if (stop_pc == ecs->stop_func_start |
4534 | && execution_direction == EXEC_REVERSE) | |
4535 | { | |
4536 | /* We are stepping over a function call in reverse, and | |
4537 | just hit the step-resume breakpoint at the start | |
4538 | address of the function. Go back to single-stepping, | |
4539 | which should take us back to the function call. */ | |
4540 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4541 | keep_going (ecs); | |
4542 | return; | |
4543 | } | |
4544 | break; | |
4545 | ||
488f131b | 4546 | case BPSTAT_WHAT_STOP_NOISY: |
527159b7 | 4547 | if (debug_infrun) |
8802d8ed | 4548 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); |
488f131b | 4549 | stop_print_frame = 1; |
c906108c | 4550 | |
d303a6c7 AC |
4551 | /* We are about to nuke the step_resume_breakpointt via the |
4552 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 4553 | |
488f131b JB |
4554 | stop_stepping (ecs); |
4555 | return; | |
c5aa993b | 4556 | |
488f131b | 4557 | case BPSTAT_WHAT_STOP_SILENT: |
527159b7 | 4558 | if (debug_infrun) |
8802d8ed | 4559 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); |
488f131b | 4560 | stop_print_frame = 0; |
c5aa993b | 4561 | |
d303a6c7 AC |
4562 | /* We are about to nuke the step_resume_breakpoin via the |
4563 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 4564 | |
488f131b | 4565 | stop_stepping (ecs); |
e441088d | 4566 | return; |
c5aa993b | 4567 | |
2c03e5be | 4568 | case BPSTAT_WHAT_HP_STEP_RESUME: |
527159b7 | 4569 | if (debug_infrun) |
2c03e5be | 4570 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); |
527159b7 | 4571 | |
4e1c45ea PA |
4572 | delete_step_resume_breakpoint (ecs->event_thread); |
4573 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
68f53502 AC |
4574 | { |
4575 | /* Back when the step-resume breakpoint was inserted, we | |
4576 | were trying to single-step off a breakpoint. Go back | |
4577 | to doing that. */ | |
4e1c45ea PA |
4578 | ecs->event_thread->step_after_step_resume_breakpoint = 0; |
4579 | ecs->event_thread->stepping_over_breakpoint = 1; | |
68f53502 AC |
4580 | keep_going (ecs); |
4581 | return; | |
4582 | } | |
488f131b JB |
4583 | break; |
4584 | ||
488f131b JB |
4585 | case BPSTAT_WHAT_KEEP_CHECKING: |
4586 | break; | |
4587 | } | |
4588 | } | |
c906108c | 4589 | |
488f131b JB |
4590 | /* We come here if we hit a breakpoint but should not |
4591 | stop for it. Possibly we also were stepping | |
4592 | and should stop for that. So fall through and | |
4593 | test for stepping. But, if not stepping, | |
4594 | do not stop. */ | |
c906108c | 4595 | |
a7212384 UW |
4596 | /* In all-stop mode, if we're currently stepping but have stopped in |
4597 | some other thread, we need to switch back to the stepped thread. */ | |
4598 | if (!non_stop) | |
4599 | { | |
4600 | struct thread_info *tp; | |
abbb1732 | 4601 | |
b3444185 | 4602 | tp = iterate_over_threads (currently_stepping_or_nexting_callback, |
a7212384 UW |
4603 | ecs->event_thread); |
4604 | if (tp) | |
4605 | { | |
4606 | /* However, if the current thread is blocked on some internal | |
4607 | breakpoint, and we simply need to step over that breakpoint | |
4608 | to get it going again, do that first. */ | |
16c381f0 JK |
4609 | if ((ecs->event_thread->control.trap_expected |
4610 | && ecs->event_thread->suspend.stop_signal != TARGET_SIGNAL_TRAP) | |
a7212384 UW |
4611 | || ecs->event_thread->stepping_over_breakpoint) |
4612 | { | |
4613 | keep_going (ecs); | |
4614 | return; | |
4615 | } | |
4616 | ||
66852e9c PA |
4617 | /* If the stepping thread exited, then don't try to switch |
4618 | back and resume it, which could fail in several different | |
4619 | ways depending on the target. Instead, just keep going. | |
4620 | ||
4621 | We can find a stepping dead thread in the thread list in | |
4622 | two cases: | |
4623 | ||
4624 | - The target supports thread exit events, and when the | |
4625 | target tries to delete the thread from the thread list, | |
4626 | inferior_ptid pointed at the exiting thread. In such | |
4627 | case, calling delete_thread does not really remove the | |
4628 | thread from the list; instead, the thread is left listed, | |
4629 | with 'exited' state. | |
4630 | ||
4631 | - The target's debug interface does not support thread | |
4632 | exit events, and so we have no idea whatsoever if the | |
4633 | previously stepping thread is still alive. For that | |
4634 | reason, we need to synchronously query the target | |
4635 | now. */ | |
b3444185 PA |
4636 | if (is_exited (tp->ptid) |
4637 | || !target_thread_alive (tp->ptid)) | |
4638 | { | |
4639 | if (debug_infrun) | |
3e43a32a MS |
4640 | fprintf_unfiltered (gdb_stdlog, |
4641 | "infrun: not switching back to " | |
4642 | "stepped thread, it has vanished\n"); | |
b3444185 PA |
4643 | |
4644 | delete_thread (tp->ptid); | |
4645 | keep_going (ecs); | |
4646 | return; | |
4647 | } | |
4648 | ||
a7212384 UW |
4649 | /* Otherwise, we no longer expect a trap in the current thread. |
4650 | Clear the trap_expected flag before switching back -- this is | |
4651 | what keep_going would do as well, if we called it. */ | |
16c381f0 | 4652 | ecs->event_thread->control.trap_expected = 0; |
a7212384 UW |
4653 | |
4654 | if (debug_infrun) | |
4655 | fprintf_unfiltered (gdb_stdlog, | |
4656 | "infrun: switching back to stepped thread\n"); | |
4657 | ||
4658 | ecs->event_thread = tp; | |
4659 | ecs->ptid = tp->ptid; | |
4660 | context_switch (ecs->ptid); | |
4661 | keep_going (ecs); | |
4662 | return; | |
4663 | } | |
4664 | } | |
4665 | ||
8358c15c | 4666 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 4667 | { |
527159b7 | 4668 | if (debug_infrun) |
d3169d93 DJ |
4669 | fprintf_unfiltered (gdb_stdlog, |
4670 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 4671 | |
488f131b JB |
4672 | /* Having a step-resume breakpoint overrides anything |
4673 | else having to do with stepping commands until | |
4674 | that breakpoint is reached. */ | |
488f131b JB |
4675 | keep_going (ecs); |
4676 | return; | |
4677 | } | |
c5aa993b | 4678 | |
16c381f0 | 4679 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 4680 | { |
527159b7 | 4681 | if (debug_infrun) |
8a9de0e4 | 4682 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 4683 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
4684 | keep_going (ecs); |
4685 | return; | |
4686 | } | |
c5aa993b | 4687 | |
4b7703ad JB |
4688 | /* Re-fetch current thread's frame in case the code above caused |
4689 | the frame cache to be re-initialized, making our FRAME variable | |
4690 | a dangling pointer. */ | |
4691 | frame = get_current_frame (); | |
628fe4e4 | 4692 | gdbarch = get_frame_arch (frame); |
7e324e48 | 4693 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 4694 | |
488f131b | 4695 | /* If stepping through a line, keep going if still within it. |
c906108c | 4696 | |
488f131b JB |
4697 | Note that step_range_end is the address of the first instruction |
4698 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
4699 | within it! |
4700 | ||
4701 | Note also that during reverse execution, we may be stepping | |
4702 | through a function epilogue and therefore must detect when | |
4703 | the current-frame changes in the middle of a line. */ | |
4704 | ||
16c381f0 JK |
4705 | if (stop_pc >= ecs->event_thread->control.step_range_start |
4706 | && stop_pc < ecs->event_thread->control.step_range_end | |
31410e84 | 4707 | && (execution_direction != EXEC_REVERSE |
388a8562 | 4708 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 4709 | ecs->event_thread->control.step_frame_id))) |
488f131b | 4710 | { |
527159b7 | 4711 | if (debug_infrun) |
5af949e3 UW |
4712 | fprintf_unfiltered |
4713 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
4714 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
4715 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 MS |
4716 | |
4717 | /* When stepping backward, stop at beginning of line range | |
4718 | (unless it's the function entry point, in which case | |
4719 | keep going back to the call point). */ | |
16c381f0 | 4720 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
4721 | && stop_pc != ecs->stop_func_start |
4722 | && execution_direction == EXEC_REVERSE) | |
4723 | { | |
16c381f0 | 4724 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 4725 | print_end_stepping_range_reason (); |
b2175913 MS |
4726 | stop_stepping (ecs); |
4727 | } | |
4728 | else | |
4729 | keep_going (ecs); | |
4730 | ||
488f131b JB |
4731 | return; |
4732 | } | |
c5aa993b | 4733 | |
488f131b | 4734 | /* We stepped out of the stepping range. */ |
c906108c | 4735 | |
488f131b | 4736 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
4737 | loader dynamic symbol resolution code... |
4738 | ||
4739 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
4740 | time loader code and reach the callee's address. | |
4741 | ||
4742 | EXEC_REVERSE: we've already executed the callee (backward), and | |
4743 | the runtime loader code is handled just like any other | |
4744 | undebuggable function call. Now we need only keep stepping | |
4745 | backward through the trampoline code, and that's handled further | |
4746 | down, so there is nothing for us to do here. */ | |
4747 | ||
4748 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 4749 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
cfd8ab24 | 4750 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 4751 | { |
4c8c40e6 | 4752 | CORE_ADDR pc_after_resolver = |
568d6575 | 4753 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); |
c906108c | 4754 | |
527159b7 | 4755 | if (debug_infrun) |
3e43a32a MS |
4756 | fprintf_unfiltered (gdb_stdlog, |
4757 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 4758 | |
488f131b JB |
4759 | if (pc_after_resolver) |
4760 | { | |
4761 | /* Set up a step-resume breakpoint at the address | |
4762 | indicated by SKIP_SOLIB_RESOLVER. */ | |
4763 | struct symtab_and_line sr_sal; | |
abbb1732 | 4764 | |
fe39c653 | 4765 | init_sal (&sr_sal); |
488f131b | 4766 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 4767 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 4768 | |
a6d9a66e UW |
4769 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4770 | sr_sal, null_frame_id); | |
c5aa993b | 4771 | } |
c906108c | 4772 | |
488f131b JB |
4773 | keep_going (ecs); |
4774 | return; | |
4775 | } | |
c906108c | 4776 | |
16c381f0 JK |
4777 | if (ecs->event_thread->control.step_range_end != 1 |
4778 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
4779 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 4780 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 4781 | { |
527159b7 | 4782 | if (debug_infrun) |
3e43a32a MS |
4783 | fprintf_unfiltered (gdb_stdlog, |
4784 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 4785 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
4786 | a signal trampoline (either by a signal being delivered or by |
4787 | the signal handler returning). Just single-step until the | |
4788 | inferior leaves the trampoline (either by calling the handler | |
4789 | or returning). */ | |
488f131b JB |
4790 | keep_going (ecs); |
4791 | return; | |
4792 | } | |
c906108c | 4793 | |
c17eaafe DJ |
4794 | /* Check for subroutine calls. The check for the current frame |
4795 | equalling the step ID is not necessary - the check of the | |
4796 | previous frame's ID is sufficient - but it is a common case and | |
4797 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
4798 | |
4799 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
4800 | being equal, so to get into this block, both the current and | |
4801 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
4802 | /* The outer_frame_id check is a heuristic to detect stepping |
4803 | through startup code. If we step over an instruction which | |
4804 | sets the stack pointer from an invalid value to a valid value, | |
4805 | we may detect that as a subroutine call from the mythical | |
4806 | "outermost" function. This could be fixed by marking | |
4807 | outermost frames as !stack_p,code_p,special_p. Then the | |
4808 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 4809 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 4810 | for more. */ |
edb3359d | 4811 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 4812 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 4813 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
4814 | ecs->event_thread->control.step_stack_frame_id) |
4815 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a JB |
4816 | outer_frame_id) |
4817 | || step_start_function != find_pc_function (stop_pc)))) | |
488f131b | 4818 | { |
95918acb | 4819 | CORE_ADDR real_stop_pc; |
8fb3e588 | 4820 | |
527159b7 | 4821 | if (debug_infrun) |
8a9de0e4 | 4822 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 4823 | |
16c381f0 JK |
4824 | if ((ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
4825 | || ((ecs->event_thread->control.step_range_end == 1) | |
d80b854b | 4826 | && in_prologue (gdbarch, ecs->event_thread->prev_pc, |
4e1c45ea | 4827 | ecs->stop_func_start))) |
95918acb AC |
4828 | { |
4829 | /* I presume that step_over_calls is only 0 when we're | |
4830 | supposed to be stepping at the assembly language level | |
4831 | ("stepi"). Just stop. */ | |
4832 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
4833 | thought it was a subroutine call but it was not. Stop as | |
4834 | well. FENN */ | |
388a8562 | 4835 | /* And this works the same backward as frontward. MVS */ |
16c381f0 | 4836 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 4837 | print_end_stepping_range_reason (); |
95918acb AC |
4838 | stop_stepping (ecs); |
4839 | return; | |
4840 | } | |
8fb3e588 | 4841 | |
388a8562 MS |
4842 | /* Reverse stepping through solib trampolines. */ |
4843 | ||
4844 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 4845 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
4846 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
4847 | || (ecs->stop_func_start == 0 | |
4848 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
4849 | { | |
4850 | /* Any solib trampoline code can be handled in reverse | |
4851 | by simply continuing to single-step. We have already | |
4852 | executed the solib function (backwards), and a few | |
4853 | steps will take us back through the trampoline to the | |
4854 | caller. */ | |
4855 | keep_going (ecs); | |
4856 | return; | |
4857 | } | |
4858 | ||
16c381f0 | 4859 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 4860 | { |
b2175913 MS |
4861 | /* We're doing a "next". |
4862 | ||
4863 | Normal (forward) execution: set a breakpoint at the | |
4864 | callee's return address (the address at which the caller | |
4865 | will resume). | |
4866 | ||
4867 | Reverse (backward) execution. set the step-resume | |
4868 | breakpoint at the start of the function that we just | |
4869 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 4870 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
4871 | |
4872 | if (execution_direction == EXEC_REVERSE) | |
4873 | { | |
4874 | struct symtab_and_line sr_sal; | |
3067f6e5 | 4875 | |
388a8562 MS |
4876 | /* Normal function call return (static or dynamic). */ |
4877 | init_sal (&sr_sal); | |
4878 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df PA |
4879 | sr_sal.pspace = get_frame_program_space (frame); |
4880 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
4881 | sr_sal, null_frame_id); | |
b2175913 MS |
4882 | } |
4883 | else | |
568d6575 | 4884 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 4885 | |
8567c30f AC |
4886 | keep_going (ecs); |
4887 | return; | |
4888 | } | |
a53c66de | 4889 | |
95918acb | 4890 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
4891 | calling routine and the real function), locate the real |
4892 | function. That's what tells us (a) whether we want to step | |
4893 | into it at all, and (b) what prologue we want to run to the | |
4894 | end of, if we do step into it. */ | |
568d6575 | 4895 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 4896 | if (real_stop_pc == 0) |
568d6575 | 4897 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
4898 | if (real_stop_pc != 0) |
4899 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 4900 | |
db5f024e | 4901 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 RC |
4902 | { |
4903 | struct symtab_and_line sr_sal; | |
abbb1732 | 4904 | |
1b2bfbb9 RC |
4905 | init_sal (&sr_sal); |
4906 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 4907 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 4908 | |
a6d9a66e UW |
4909 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4910 | sr_sal, null_frame_id); | |
8fb3e588 AC |
4911 | keep_going (ecs); |
4912 | return; | |
1b2bfbb9 RC |
4913 | } |
4914 | ||
95918acb | 4915 | /* If we have line number information for the function we are |
1bfeeb0f JL |
4916 | thinking of stepping into and the function isn't on the skip |
4917 | list, step into it. | |
95918acb | 4918 | |
8fb3e588 AC |
4919 | If there are several symtabs at that PC (e.g. with include |
4920 | files), just want to know whether *any* of them have line | |
4921 | numbers. find_pc_line handles this. */ | |
95918acb AC |
4922 | { |
4923 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 4924 | |
95918acb | 4925 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 JB |
4926 | if (tmp_sal.line != 0 |
4927 | && !function_pc_is_marked_for_skip (ecs->stop_func_start)) | |
95918acb | 4928 | { |
b2175913 | 4929 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 4930 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 4931 | else |
568d6575 | 4932 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
4933 | return; |
4934 | } | |
4935 | } | |
4936 | ||
4937 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
4938 | set, we stop the step so that the user has a chance to switch |
4939 | in assembly mode. */ | |
16c381f0 | 4940 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 4941 | && step_stop_if_no_debug) |
95918acb | 4942 | { |
16c381f0 | 4943 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 4944 | print_end_stepping_range_reason (); |
95918acb AC |
4945 | stop_stepping (ecs); |
4946 | return; | |
4947 | } | |
4948 | ||
b2175913 MS |
4949 | if (execution_direction == EXEC_REVERSE) |
4950 | { | |
4951 | /* Set a breakpoint at callee's start address. | |
4952 | From there we can step once and be back in the caller. */ | |
4953 | struct symtab_and_line sr_sal; | |
abbb1732 | 4954 | |
b2175913 MS |
4955 | init_sal (&sr_sal); |
4956 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 4957 | sr_sal.pspace = get_frame_program_space (frame); |
a6d9a66e UW |
4958 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4959 | sr_sal, null_frame_id); | |
b2175913 MS |
4960 | } |
4961 | else | |
4962 | /* Set a breakpoint at callee's return address (the address | |
4963 | at which the caller will resume). */ | |
568d6575 | 4964 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 4965 | |
95918acb | 4966 | keep_going (ecs); |
488f131b | 4967 | return; |
488f131b | 4968 | } |
c906108c | 4969 | |
fdd654f3 MS |
4970 | /* Reverse stepping through solib trampolines. */ |
4971 | ||
4972 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 4973 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 MS |
4974 | { |
4975 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
4976 | || (ecs->stop_func_start == 0 | |
4977 | && in_solib_dynsym_resolve_code (stop_pc))) | |
4978 | { | |
4979 | /* Any solib trampoline code can be handled in reverse | |
4980 | by simply continuing to single-step. We have already | |
4981 | executed the solib function (backwards), and a few | |
4982 | steps will take us back through the trampoline to the | |
4983 | caller. */ | |
4984 | keep_going (ecs); | |
4985 | return; | |
4986 | } | |
4987 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
4988 | { | |
4989 | /* Stepped backward into the solib dynsym resolver. | |
4990 | Set a breakpoint at its start and continue, then | |
4991 | one more step will take us out. */ | |
4992 | struct symtab_and_line sr_sal; | |
abbb1732 | 4993 | |
fdd654f3 MS |
4994 | init_sal (&sr_sal); |
4995 | sr_sal.pc = ecs->stop_func_start; | |
9d1807c3 | 4996 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
4997 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4998 | sr_sal, null_frame_id); | |
4999 | keep_going (ecs); | |
5000 | return; | |
5001 | } | |
5002 | } | |
5003 | ||
488f131b JB |
5004 | /* If we're in the return path from a shared library trampoline, |
5005 | we want to proceed through the trampoline when stepping. */ | |
568d6575 | 5006 | if (gdbarch_in_solib_return_trampoline (gdbarch, |
e76f05fa | 5007 | stop_pc, ecs->stop_func_name)) |
488f131b | 5008 | { |
488f131b | 5009 | /* Determine where this trampoline returns. */ |
52f729a7 | 5010 | CORE_ADDR real_stop_pc; |
abbb1732 | 5011 | |
568d6575 | 5012 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
c906108c | 5013 | |
527159b7 | 5014 | if (debug_infrun) |
3e43a32a MS |
5015 | fprintf_unfiltered (gdb_stdlog, |
5016 | "infrun: stepped into solib return tramp\n"); | |
527159b7 | 5017 | |
488f131b | 5018 | /* Only proceed through if we know where it's going. */ |
d764a824 | 5019 | if (real_stop_pc) |
488f131b | 5020 | { |
1777feb0 | 5021 | /* And put the step-breakpoint there and go until there. */ |
488f131b JB |
5022 | struct symtab_and_line sr_sal; |
5023 | ||
fe39c653 | 5024 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 5025 | sr_sal.pc = real_stop_pc; |
488f131b | 5026 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5027 | sr_sal.pspace = get_frame_program_space (frame); |
44cbf7b5 AC |
5028 | |
5029 | /* Do not specify what the fp should be when we stop since | |
5030 | on some machines the prologue is where the new fp value | |
5031 | is established. */ | |
a6d9a66e UW |
5032 | insert_step_resume_breakpoint_at_sal (gdbarch, |
5033 | sr_sal, null_frame_id); | |
c906108c | 5034 | |
488f131b JB |
5035 | /* Restart without fiddling with the step ranges or |
5036 | other state. */ | |
5037 | keep_going (ecs); | |
5038 | return; | |
5039 | } | |
5040 | } | |
c906108c | 5041 | |
2afb61aa | 5042 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 5043 | |
1b2bfbb9 RC |
5044 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
5045 | the trampoline processing logic, however, there are some trampolines | |
5046 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 5047 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 5048 | && ecs->stop_func_name == NULL |
2afb61aa | 5049 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 5050 | { |
527159b7 | 5051 | if (debug_infrun) |
3e43a32a MS |
5052 | fprintf_unfiltered (gdb_stdlog, |
5053 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 5054 | |
1b2bfbb9 | 5055 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
5056 | undebuggable function (where there is no debugging information |
5057 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
5058 | inferior stopped). Since we want to skip this kind of code, |
5059 | we keep going until the inferior returns from this | |
14e60db5 DJ |
5060 | function - unless the user has asked us not to (via |
5061 | set step-mode) or we no longer know how to get back | |
5062 | to the call site. */ | |
5063 | if (step_stop_if_no_debug | |
c7ce8faa | 5064 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
5065 | { |
5066 | /* If we have no line number and the step-stop-if-no-debug | |
5067 | is set, we stop the step so that the user has a chance to | |
5068 | switch in assembly mode. */ | |
16c381f0 | 5069 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5070 | print_end_stepping_range_reason (); |
1b2bfbb9 RC |
5071 | stop_stepping (ecs); |
5072 | return; | |
5073 | } | |
5074 | else | |
5075 | { | |
5076 | /* Set a breakpoint at callee's return address (the address | |
5077 | at which the caller will resume). */ | |
568d6575 | 5078 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
5079 | keep_going (ecs); |
5080 | return; | |
5081 | } | |
5082 | } | |
5083 | ||
16c381f0 | 5084 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
5085 | { |
5086 | /* It is stepi or nexti. We always want to stop stepping after | |
5087 | one instruction. */ | |
527159b7 | 5088 | if (debug_infrun) |
8a9de0e4 | 5089 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
16c381f0 | 5090 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5091 | print_end_stepping_range_reason (); |
1b2bfbb9 RC |
5092 | stop_stepping (ecs); |
5093 | return; | |
5094 | } | |
5095 | ||
2afb61aa | 5096 | if (stop_pc_sal.line == 0) |
488f131b JB |
5097 | { |
5098 | /* We have no line number information. That means to stop | |
5099 | stepping (does this always happen right after one instruction, | |
5100 | when we do "s" in a function with no line numbers, | |
5101 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 5102 | if (debug_infrun) |
8a9de0e4 | 5103 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
16c381f0 | 5104 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5105 | print_end_stepping_range_reason (); |
488f131b JB |
5106 | stop_stepping (ecs); |
5107 | return; | |
5108 | } | |
c906108c | 5109 | |
edb3359d DJ |
5110 | /* Look for "calls" to inlined functions, part one. If the inline |
5111 | frame machinery detected some skipped call sites, we have entered | |
5112 | a new inline function. */ | |
5113 | ||
5114 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 5115 | ecs->event_thread->control.step_frame_id) |
edb3359d DJ |
5116 | && inline_skipped_frames (ecs->ptid)) |
5117 | { | |
5118 | struct symtab_and_line call_sal; | |
5119 | ||
5120 | if (debug_infrun) | |
5121 | fprintf_unfiltered (gdb_stdlog, | |
5122 | "infrun: stepped into inlined function\n"); | |
5123 | ||
5124 | find_frame_sal (get_current_frame (), &call_sal); | |
5125 | ||
16c381f0 | 5126 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
5127 | { |
5128 | /* For "step", we're going to stop. But if the call site | |
5129 | for this inlined function is on the same source line as | |
5130 | we were previously stepping, go down into the function | |
5131 | first. Otherwise stop at the call site. */ | |
5132 | ||
5133 | if (call_sal.line == ecs->event_thread->current_line | |
5134 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
5135 | step_into_inline_frame (ecs->ptid); | |
5136 | ||
16c381f0 | 5137 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5138 | print_end_stepping_range_reason (); |
edb3359d DJ |
5139 | stop_stepping (ecs); |
5140 | return; | |
5141 | } | |
5142 | else | |
5143 | { | |
5144 | /* For "next", we should stop at the call site if it is on a | |
5145 | different source line. Otherwise continue through the | |
5146 | inlined function. */ | |
5147 | if (call_sal.line == ecs->event_thread->current_line | |
5148 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
5149 | keep_going (ecs); | |
5150 | else | |
5151 | { | |
16c381f0 | 5152 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5153 | print_end_stepping_range_reason (); |
edb3359d DJ |
5154 | stop_stepping (ecs); |
5155 | } | |
5156 | return; | |
5157 | } | |
5158 | } | |
5159 | ||
5160 | /* Look for "calls" to inlined functions, part two. If we are still | |
5161 | in the same real function we were stepping through, but we have | |
5162 | to go further up to find the exact frame ID, we are stepping | |
5163 | through a more inlined call beyond its call site. */ | |
5164 | ||
5165 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
5166 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 5167 | ecs->event_thread->control.step_frame_id) |
edb3359d | 5168 | && stepped_in_from (get_current_frame (), |
16c381f0 | 5169 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
5170 | { |
5171 | if (debug_infrun) | |
5172 | fprintf_unfiltered (gdb_stdlog, | |
5173 | "infrun: stepping through inlined function\n"); | |
5174 | ||
16c381f0 | 5175 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
5176 | keep_going (ecs); |
5177 | else | |
5178 | { | |
16c381f0 | 5179 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5180 | print_end_stepping_range_reason (); |
edb3359d DJ |
5181 | stop_stepping (ecs); |
5182 | } | |
5183 | return; | |
5184 | } | |
5185 | ||
2afb61aa | 5186 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
5187 | && (ecs->event_thread->current_line != stop_pc_sal.line |
5188 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
5189 | { |
5190 | /* We are at the start of a different line. So stop. Note that | |
5191 | we don't stop if we step into the middle of a different line. | |
5192 | That is said to make things like for (;;) statements work | |
5193 | better. */ | |
527159b7 | 5194 | if (debug_infrun) |
3e43a32a MS |
5195 | fprintf_unfiltered (gdb_stdlog, |
5196 | "infrun: stepped to a different line\n"); | |
16c381f0 | 5197 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5198 | print_end_stepping_range_reason (); |
488f131b JB |
5199 | stop_stepping (ecs); |
5200 | return; | |
5201 | } | |
c906108c | 5202 | |
488f131b | 5203 | /* We aren't done stepping. |
c906108c | 5204 | |
488f131b JB |
5205 | Optimize by setting the stepping range to the line. |
5206 | (We might not be in the original line, but if we entered a | |
5207 | new line in mid-statement, we continue stepping. This makes | |
5208 | things like for(;;) statements work better.) */ | |
c906108c | 5209 | |
16c381f0 JK |
5210 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
5211 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
edb3359d | 5212 | set_step_info (frame, stop_pc_sal); |
488f131b | 5213 | |
527159b7 | 5214 | if (debug_infrun) |
8a9de0e4 | 5215 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 5216 | keep_going (ecs); |
104c1213 JM |
5217 | } |
5218 | ||
b3444185 | 5219 | /* Is thread TP in the middle of single-stepping? */ |
104c1213 | 5220 | |
a289b8f6 | 5221 | static int |
b3444185 | 5222 | currently_stepping (struct thread_info *tp) |
a7212384 | 5223 | { |
8358c15c JK |
5224 | return ((tp->control.step_range_end |
5225 | && tp->control.step_resume_breakpoint == NULL) | |
5226 | || tp->control.trap_expected | |
8358c15c | 5227 | || bpstat_should_step ()); |
a7212384 UW |
5228 | } |
5229 | ||
b3444185 PA |
5230 | /* Returns true if any thread *but* the one passed in "data" is in the |
5231 | middle of stepping or of handling a "next". */ | |
a7212384 | 5232 | |
104c1213 | 5233 | static int |
b3444185 | 5234 | currently_stepping_or_nexting_callback (struct thread_info *tp, void *data) |
104c1213 | 5235 | { |
b3444185 PA |
5236 | if (tp == data) |
5237 | return 0; | |
5238 | ||
16c381f0 | 5239 | return (tp->control.step_range_end |
ede1849f | 5240 | || tp->control.trap_expected); |
104c1213 | 5241 | } |
c906108c | 5242 | |
b2175913 MS |
5243 | /* Inferior has stepped into a subroutine call with source code that |
5244 | we should not step over. Do step to the first line of code in | |
5245 | it. */ | |
c2c6d25f JM |
5246 | |
5247 | static void | |
568d6575 UW |
5248 | handle_step_into_function (struct gdbarch *gdbarch, |
5249 | struct execution_control_state *ecs) | |
c2c6d25f JM |
5250 | { |
5251 | struct symtab *s; | |
2afb61aa | 5252 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f | 5253 | |
7e324e48 GB |
5254 | fill_in_stop_func (gdbarch, ecs); |
5255 | ||
c2c6d25f JM |
5256 | s = find_pc_symtab (stop_pc); |
5257 | if (s && s->language != language_asm) | |
568d6575 | 5258 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 | 5259 | ecs->stop_func_start); |
c2c6d25f | 5260 | |
2afb61aa | 5261 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
5262 | /* Use the step_resume_break to step until the end of the prologue, |
5263 | even if that involves jumps (as it seems to on the vax under | |
5264 | 4.2). */ | |
5265 | /* If the prologue ends in the middle of a source line, continue to | |
5266 | the end of that source line (if it is still within the function). | |
5267 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
5268 | if (stop_func_sal.end |
5269 | && stop_func_sal.pc != ecs->stop_func_start | |
5270 | && stop_func_sal.end < ecs->stop_func_end) | |
5271 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 5272 | |
2dbd5e30 KB |
5273 | /* Architectures which require breakpoint adjustment might not be able |
5274 | to place a breakpoint at the computed address. If so, the test | |
5275 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
5276 | ecs->stop_func_start to an address at which a breakpoint may be | |
5277 | legitimately placed. | |
8fb3e588 | 5278 | |
2dbd5e30 KB |
5279 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
5280 | made, GDB will enter an infinite loop when stepping through | |
5281 | optimized code consisting of VLIW instructions which contain | |
5282 | subinstructions corresponding to different source lines. On | |
5283 | FR-V, it's not permitted to place a breakpoint on any but the | |
5284 | first subinstruction of a VLIW instruction. When a breakpoint is | |
5285 | set, GDB will adjust the breakpoint address to the beginning of | |
5286 | the VLIW instruction. Thus, we need to make the corresponding | |
5287 | adjustment here when computing the stop address. */ | |
8fb3e588 | 5288 | |
568d6575 | 5289 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
5290 | { |
5291 | ecs->stop_func_start | |
568d6575 | 5292 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 5293 | ecs->stop_func_start); |
2dbd5e30 KB |
5294 | } |
5295 | ||
c2c6d25f JM |
5296 | if (ecs->stop_func_start == stop_pc) |
5297 | { | |
5298 | /* We are already there: stop now. */ | |
16c381f0 | 5299 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5300 | print_end_stepping_range_reason (); |
c2c6d25f JM |
5301 | stop_stepping (ecs); |
5302 | return; | |
5303 | } | |
5304 | else | |
5305 | { | |
5306 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 5307 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
5308 | sr_sal.pc = ecs->stop_func_start; |
5309 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 5310 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 5311 | |
c2c6d25f | 5312 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
5313 | some machines the prologue is where the new fp value is |
5314 | established. */ | |
a6d9a66e | 5315 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
5316 | |
5317 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
5318 | ecs->event_thread->control.step_range_end |
5319 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
5320 | } |
5321 | keep_going (ecs); | |
5322 | } | |
d4f3574e | 5323 | |
b2175913 MS |
5324 | /* Inferior has stepped backward into a subroutine call with source |
5325 | code that we should not step over. Do step to the beginning of the | |
5326 | last line of code in it. */ | |
5327 | ||
5328 | static void | |
568d6575 UW |
5329 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
5330 | struct execution_control_state *ecs) | |
b2175913 MS |
5331 | { |
5332 | struct symtab *s; | |
167e4384 | 5333 | struct symtab_and_line stop_func_sal; |
b2175913 | 5334 | |
7e324e48 GB |
5335 | fill_in_stop_func (gdbarch, ecs); |
5336 | ||
b2175913 MS |
5337 | s = find_pc_symtab (stop_pc); |
5338 | if (s && s->language != language_asm) | |
568d6575 | 5339 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 MS |
5340 | ecs->stop_func_start); |
5341 | ||
5342 | stop_func_sal = find_pc_line (stop_pc, 0); | |
5343 | ||
5344 | /* OK, we're just going to keep stepping here. */ | |
5345 | if (stop_func_sal.pc == stop_pc) | |
5346 | { | |
5347 | /* We're there already. Just stop stepping now. */ | |
16c381f0 | 5348 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5349 | print_end_stepping_range_reason (); |
b2175913 MS |
5350 | stop_stepping (ecs); |
5351 | } | |
5352 | else | |
5353 | { | |
5354 | /* Else just reset the step range and keep going. | |
5355 | No step-resume breakpoint, they don't work for | |
5356 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
5357 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
5358 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
5359 | keep_going (ecs); |
5360 | } | |
5361 | return; | |
5362 | } | |
5363 | ||
d3169d93 | 5364 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
5365 | This is used to both functions and to skip over code. */ |
5366 | ||
5367 | static void | |
2c03e5be PA |
5368 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
5369 | struct symtab_and_line sr_sal, | |
5370 | struct frame_id sr_id, | |
5371 | enum bptype sr_type) | |
44cbf7b5 | 5372 | { |
611c83ae PA |
5373 | /* There should never be more than one step-resume or longjmp-resume |
5374 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 5375 | step_resume_breakpoint when one is already active. */ |
8358c15c | 5376 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 5377 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
5378 | |
5379 | if (debug_infrun) | |
5380 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5381 | "infrun: inserting step-resume breakpoint at %s\n", |
5382 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 5383 | |
8358c15c | 5384 | inferior_thread ()->control.step_resume_breakpoint |
2c03e5be PA |
5385 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type); |
5386 | } | |
5387 | ||
9da8c2a0 | 5388 | void |
2c03e5be PA |
5389 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
5390 | struct symtab_and_line sr_sal, | |
5391 | struct frame_id sr_id) | |
5392 | { | |
5393 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
5394 | sr_sal, sr_id, | |
5395 | bp_step_resume); | |
44cbf7b5 | 5396 | } |
7ce450bd | 5397 | |
2c03e5be PA |
5398 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
5399 | This is used to skip a potential signal handler. | |
7ce450bd | 5400 | |
14e60db5 DJ |
5401 | This is called with the interrupted function's frame. The signal |
5402 | handler, when it returns, will resume the interrupted function at | |
5403 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
5404 | |
5405 | static void | |
2c03e5be | 5406 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
5407 | { |
5408 | struct symtab_and_line sr_sal; | |
a6d9a66e | 5409 | struct gdbarch *gdbarch; |
d303a6c7 | 5410 | |
f4c1edd8 | 5411 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
5412 | init_sal (&sr_sal); /* initialize to zeros */ |
5413 | ||
a6d9a66e | 5414 | gdbarch = get_frame_arch (return_frame); |
568d6575 | 5415 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 5416 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5417 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 5418 | |
2c03e5be PA |
5419 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
5420 | get_stack_frame_id (return_frame), | |
5421 | bp_hp_step_resume); | |
d303a6c7 AC |
5422 | } |
5423 | ||
2c03e5be PA |
5424 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
5425 | is used to skip a function after stepping into it (for "next" or if | |
5426 | the called function has no debugging information). | |
14e60db5 DJ |
5427 | |
5428 | The current function has almost always been reached by single | |
5429 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
5430 | current function, and the breakpoint will be set at the caller's | |
5431 | resume address. | |
5432 | ||
5433 | This is a separate function rather than reusing | |
2c03e5be | 5434 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 5435 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 5436 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
5437 | |
5438 | static void | |
5439 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
5440 | { | |
5441 | struct symtab_and_line sr_sal; | |
a6d9a66e | 5442 | struct gdbarch *gdbarch; |
14e60db5 DJ |
5443 | |
5444 | /* We shouldn't have gotten here if we don't know where the call site | |
5445 | is. */ | |
c7ce8faa | 5446 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 DJ |
5447 | |
5448 | init_sal (&sr_sal); /* initialize to zeros */ | |
5449 | ||
a6d9a66e | 5450 | gdbarch = frame_unwind_caller_arch (next_frame); |
c7ce8faa DJ |
5451 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
5452 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 5453 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5454 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 5455 | |
a6d9a66e | 5456 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 5457 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
5458 | } |
5459 | ||
611c83ae PA |
5460 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
5461 | new breakpoint at the target of a jmp_buf. The handling of | |
5462 | longjmp-resume uses the same mechanisms used for handling | |
5463 | "step-resume" breakpoints. */ | |
5464 | ||
5465 | static void | |
a6d9a66e | 5466 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae PA |
5467 | { |
5468 | /* There should never be more than one step-resume or longjmp-resume | |
5469 | breakpoint per thread, so we should never be setting a new | |
5470 | longjmp_resume_breakpoint when one is already active. */ | |
8358c15c | 5471 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
611c83ae PA |
5472 | |
5473 | if (debug_infrun) | |
5474 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5475 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
5476 | paddress (gdbarch, pc)); | |
611c83ae | 5477 | |
8358c15c | 5478 | inferior_thread ()->control.step_resume_breakpoint = |
a6d9a66e | 5479 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); |
611c83ae PA |
5480 | } |
5481 | ||
186c406b TT |
5482 | /* Insert an exception resume breakpoint. TP is the thread throwing |
5483 | the exception. The block B is the block of the unwinder debug hook | |
5484 | function. FRAME is the frame corresponding to the call to this | |
5485 | function. SYM is the symbol of the function argument holding the | |
5486 | target PC of the exception. */ | |
5487 | ||
5488 | static void | |
5489 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
5490 | struct block *b, | |
5491 | struct frame_info *frame, | |
5492 | struct symbol *sym) | |
5493 | { | |
bfd189b1 | 5494 | volatile struct gdb_exception e; |
186c406b TT |
5495 | |
5496 | /* We want to ignore errors here. */ | |
5497 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
5498 | { | |
5499 | struct symbol *vsym; | |
5500 | struct value *value; | |
5501 | CORE_ADDR handler; | |
5502 | struct breakpoint *bp; | |
5503 | ||
5504 | vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL); | |
5505 | value = read_var_value (vsym, frame); | |
5506 | /* If the value was optimized out, revert to the old behavior. */ | |
5507 | if (! value_optimized_out (value)) | |
5508 | { | |
5509 | handler = value_as_address (value); | |
5510 | ||
5511 | if (debug_infrun) | |
5512 | fprintf_unfiltered (gdb_stdlog, | |
5513 | "infrun: exception resume at %lx\n", | |
5514 | (unsigned long) handler); | |
5515 | ||
5516 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
5517 | handler, bp_exception_resume); | |
5518 | bp->thread = tp->num; | |
5519 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
5520 | } | |
5521 | } | |
5522 | } | |
5523 | ||
5524 | /* This is called when an exception has been intercepted. Check to | |
5525 | see whether the exception's destination is of interest, and if so, | |
5526 | set an exception resume breakpoint there. */ | |
5527 | ||
5528 | static void | |
5529 | check_exception_resume (struct execution_control_state *ecs, | |
5530 | struct frame_info *frame, struct symbol *func) | |
5531 | { | |
bfd189b1 | 5532 | volatile struct gdb_exception e; |
186c406b TT |
5533 | |
5534 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
5535 | { | |
5536 | struct block *b; | |
5537 | struct dict_iterator iter; | |
5538 | struct symbol *sym; | |
5539 | int argno = 0; | |
5540 | ||
5541 | /* The exception breakpoint is a thread-specific breakpoint on | |
5542 | the unwinder's debug hook, declared as: | |
5543 | ||
5544 | void _Unwind_DebugHook (void *cfa, void *handler); | |
5545 | ||
5546 | The CFA argument indicates the frame to which control is | |
5547 | about to be transferred. HANDLER is the destination PC. | |
5548 | ||
5549 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
5550 | This is not extremely efficient but it avoids issues in gdb | |
5551 | with computing the DWARF CFA, and it also works even in weird | |
5552 | cases such as throwing an exception from inside a signal | |
5553 | handler. */ | |
5554 | ||
5555 | b = SYMBOL_BLOCK_VALUE (func); | |
5556 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
5557 | { | |
5558 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
5559 | continue; | |
5560 | ||
5561 | if (argno == 0) | |
5562 | ++argno; | |
5563 | else | |
5564 | { | |
5565 | insert_exception_resume_breakpoint (ecs->event_thread, | |
5566 | b, frame, sym); | |
5567 | break; | |
5568 | } | |
5569 | } | |
5570 | } | |
5571 | } | |
5572 | ||
104c1213 JM |
5573 | static void |
5574 | stop_stepping (struct execution_control_state *ecs) | |
5575 | { | |
527159b7 | 5576 | if (debug_infrun) |
8a9de0e4 | 5577 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
527159b7 | 5578 | |
cd0fc7c3 SS |
5579 | /* Let callers know we don't want to wait for the inferior anymore. */ |
5580 | ecs->wait_some_more = 0; | |
5581 | } | |
5582 | ||
d4f3574e SS |
5583 | /* This function handles various cases where we need to continue |
5584 | waiting for the inferior. */ | |
1777feb0 | 5585 | /* (Used to be the keep_going: label in the old wait_for_inferior). */ |
d4f3574e SS |
5586 | |
5587 | static void | |
5588 | keep_going (struct execution_control_state *ecs) | |
5589 | { | |
c4dbc9af PA |
5590 | /* Make sure normal_stop is called if we get a QUIT handled before |
5591 | reaching resume. */ | |
5592 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
5593 | ||
d4f3574e | 5594 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
5595 | ecs->event_thread->prev_pc |
5596 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 5597 | |
d4f3574e SS |
5598 | /* If we did not do break;, it means we should keep running the |
5599 | inferior and not return to debugger. */ | |
5600 | ||
16c381f0 JK |
5601 | if (ecs->event_thread->control.trap_expected |
5602 | && ecs->event_thread->suspend.stop_signal != TARGET_SIGNAL_TRAP) | |
d4f3574e SS |
5603 | { |
5604 | /* We took a signal (which we are supposed to pass through to | |
4e1c45ea PA |
5605 | the inferior, else we'd not get here) and we haven't yet |
5606 | gotten our trap. Simply continue. */ | |
c4dbc9af PA |
5607 | |
5608 | discard_cleanups (old_cleanups); | |
2020b7ab | 5609 | resume (currently_stepping (ecs->event_thread), |
16c381f0 | 5610 | ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
5611 | } |
5612 | else | |
5613 | { | |
5614 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
5615 | anyway (the user asked that this signal be passed to the |
5616 | child) | |
5617 | -- or -- | |
5618 | The signal was SIGTRAP, e.g. it was our signal, but we | |
5619 | decided we should resume from it. | |
d4f3574e | 5620 | |
c36b740a | 5621 | We're going to run this baby now! |
d4f3574e | 5622 | |
c36b740a VP |
5623 | Note that insert_breakpoints won't try to re-insert |
5624 | already inserted breakpoints. Therefore, we don't | |
5625 | care if breakpoints were already inserted, or not. */ | |
5626 | ||
4e1c45ea | 5627 | if (ecs->event_thread->stepping_over_breakpoint) |
45e8c884 | 5628 | { |
9f5a595d | 5629 | struct regcache *thread_regcache = get_thread_regcache (ecs->ptid); |
abbb1732 | 5630 | |
9f5a595d | 5631 | if (!use_displaced_stepping (get_regcache_arch (thread_regcache))) |
237fc4c9 PA |
5632 | /* Since we can't do a displaced step, we have to remove |
5633 | the breakpoint while we step it. To keep things | |
5634 | simple, we remove them all. */ | |
5635 | remove_breakpoints (); | |
45e8c884 VP |
5636 | } |
5637 | else | |
d4f3574e | 5638 | { |
bfd189b1 | 5639 | volatile struct gdb_exception e; |
abbb1732 | 5640 | |
569631c6 UW |
5641 | /* Stop stepping when inserting breakpoints |
5642 | has failed. */ | |
e236ba44 VP |
5643 | TRY_CATCH (e, RETURN_MASK_ERROR) |
5644 | { | |
5645 | insert_breakpoints (); | |
5646 | } | |
5647 | if (e.reason < 0) | |
d4f3574e | 5648 | { |
97bd5475 | 5649 | exception_print (gdb_stderr, e); |
d4f3574e SS |
5650 | stop_stepping (ecs); |
5651 | return; | |
5652 | } | |
d4f3574e SS |
5653 | } |
5654 | ||
16c381f0 JK |
5655 | ecs->event_thread->control.trap_expected |
5656 | = ecs->event_thread->stepping_over_breakpoint; | |
d4f3574e SS |
5657 | |
5658 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
5659 | specifies that such a signal should be delivered to the |
5660 | target program). | |
5661 | ||
5662 | Typically, this would occure when a user is debugging a | |
5663 | target monitor on a simulator: the target monitor sets a | |
5664 | breakpoint; the simulator encounters this break-point and | |
5665 | halts the simulation handing control to GDB; GDB, noteing | |
5666 | that the break-point isn't valid, returns control back to the | |
5667 | simulator; the simulator then delivers the hardware | |
1777feb0 | 5668 | equivalent of a SIGNAL_TRAP to the program being debugged. */ |
488f131b | 5669 | |
16c381f0 JK |
5670 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP |
5671 | && !signal_program[ecs->event_thread->suspend.stop_signal]) | |
5672 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; | |
d4f3574e | 5673 | |
c4dbc9af | 5674 | discard_cleanups (old_cleanups); |
2020b7ab | 5675 | resume (currently_stepping (ecs->event_thread), |
16c381f0 | 5676 | ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
5677 | } |
5678 | ||
488f131b | 5679 | prepare_to_wait (ecs); |
d4f3574e SS |
5680 | } |
5681 | ||
104c1213 JM |
5682 | /* This function normally comes after a resume, before |
5683 | handle_inferior_event exits. It takes care of any last bits of | |
5684 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 5685 | |
104c1213 JM |
5686 | static void |
5687 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 5688 | { |
527159b7 | 5689 | if (debug_infrun) |
8a9de0e4 | 5690 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 5691 | |
104c1213 JM |
5692 | /* This is the old end of the while loop. Let everybody know we |
5693 | want to wait for the inferior some more and get called again | |
5694 | soon. */ | |
5695 | ecs->wait_some_more = 1; | |
c906108c | 5696 | } |
11cf8741 | 5697 | |
33d62d64 JK |
5698 | /* Several print_*_reason functions to print why the inferior has stopped. |
5699 | We always print something when the inferior exits, or receives a signal. | |
5700 | The rest of the cases are dealt with later on in normal_stop and | |
5701 | print_it_typical. Ideally there should be a call to one of these | |
5702 | print_*_reason functions functions from handle_inferior_event each time | |
5703 | stop_stepping is called. */ | |
5704 | ||
5705 | /* Print why the inferior has stopped. | |
5706 | We are done with a step/next/si/ni command, print why the inferior has | |
5707 | stopped. For now print nothing. Print a message only if not in the middle | |
5708 | of doing a "step n" operation for n > 1. */ | |
5709 | ||
5710 | static void | |
5711 | print_end_stepping_range_reason (void) | |
5712 | { | |
16c381f0 JK |
5713 | if ((!inferior_thread ()->step_multi |
5714 | || !inferior_thread ()->control.stop_step) | |
79a45e25 PA |
5715 | && ui_out_is_mi_like_p (current_uiout)) |
5716 | ui_out_field_string (current_uiout, "reason", | |
33d62d64 JK |
5717 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
5718 | } | |
5719 | ||
5720 | /* The inferior was terminated by a signal, print why it stopped. */ | |
5721 | ||
11cf8741 | 5722 | static void |
33d62d64 | 5723 | print_signal_exited_reason (enum target_signal siggnal) |
11cf8741 | 5724 | { |
79a45e25 PA |
5725 | struct ui_out *uiout = current_uiout; |
5726 | ||
33d62d64 JK |
5727 | annotate_signalled (); |
5728 | if (ui_out_is_mi_like_p (uiout)) | |
5729 | ui_out_field_string | |
5730 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
5731 | ui_out_text (uiout, "\nProgram terminated with signal "); | |
5732 | annotate_signal_name (); | |
5733 | ui_out_field_string (uiout, "signal-name", | |
5734 | target_signal_to_name (siggnal)); | |
5735 | annotate_signal_name_end (); | |
5736 | ui_out_text (uiout, ", "); | |
5737 | annotate_signal_string (); | |
5738 | ui_out_field_string (uiout, "signal-meaning", | |
5739 | target_signal_to_string (siggnal)); | |
5740 | annotate_signal_string_end (); | |
5741 | ui_out_text (uiout, ".\n"); | |
5742 | ui_out_text (uiout, "The program no longer exists.\n"); | |
5743 | } | |
5744 | ||
5745 | /* The inferior program is finished, print why it stopped. */ | |
5746 | ||
5747 | static void | |
5748 | print_exited_reason (int exitstatus) | |
5749 | { | |
fda326dd TT |
5750 | struct inferior *inf = current_inferior (); |
5751 | const char *pidstr = target_pid_to_str (pid_to_ptid (inf->pid)); | |
79a45e25 | 5752 | struct ui_out *uiout = current_uiout; |
fda326dd | 5753 | |
33d62d64 JK |
5754 | annotate_exited (exitstatus); |
5755 | if (exitstatus) | |
5756 | { | |
5757 | if (ui_out_is_mi_like_p (uiout)) | |
5758 | ui_out_field_string (uiout, "reason", | |
5759 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
fda326dd TT |
5760 | ui_out_text (uiout, "[Inferior "); |
5761 | ui_out_text (uiout, plongest (inf->num)); | |
5762 | ui_out_text (uiout, " ("); | |
5763 | ui_out_text (uiout, pidstr); | |
5764 | ui_out_text (uiout, ") exited with code "); | |
33d62d64 | 5765 | ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) exitstatus); |
fda326dd | 5766 | ui_out_text (uiout, "]\n"); |
33d62d64 JK |
5767 | } |
5768 | else | |
11cf8741 | 5769 | { |
9dc5e2a9 | 5770 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f | 5771 | ui_out_field_string |
33d62d64 | 5772 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); |
fda326dd TT |
5773 | ui_out_text (uiout, "[Inferior "); |
5774 | ui_out_text (uiout, plongest (inf->num)); | |
5775 | ui_out_text (uiout, " ("); | |
5776 | ui_out_text (uiout, pidstr); | |
5777 | ui_out_text (uiout, ") exited normally]\n"); | |
33d62d64 JK |
5778 | } |
5779 | /* Support the --return-child-result option. */ | |
5780 | return_child_result_value = exitstatus; | |
5781 | } | |
5782 | ||
5783 | /* Signal received, print why the inferior has stopped. The signal table | |
1777feb0 | 5784 | tells us to print about it. */ |
33d62d64 JK |
5785 | |
5786 | static void | |
5787 | print_signal_received_reason (enum target_signal siggnal) | |
5788 | { | |
79a45e25 PA |
5789 | struct ui_out *uiout = current_uiout; |
5790 | ||
33d62d64 JK |
5791 | annotate_signal (); |
5792 | ||
5793 | if (siggnal == TARGET_SIGNAL_0 && !ui_out_is_mi_like_p (uiout)) | |
5794 | { | |
5795 | struct thread_info *t = inferior_thread (); | |
5796 | ||
5797 | ui_out_text (uiout, "\n["); | |
5798 | ui_out_field_string (uiout, "thread-name", | |
5799 | target_pid_to_str (t->ptid)); | |
5800 | ui_out_field_fmt (uiout, "thread-id", "] #%d", t->num); | |
5801 | ui_out_text (uiout, " stopped"); | |
5802 | } | |
5803 | else | |
5804 | { | |
5805 | ui_out_text (uiout, "\nProgram received signal "); | |
8b93c638 | 5806 | annotate_signal_name (); |
33d62d64 JK |
5807 | if (ui_out_is_mi_like_p (uiout)) |
5808 | ui_out_field_string | |
5809 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b | 5810 | ui_out_field_string (uiout, "signal-name", |
33d62d64 | 5811 | target_signal_to_name (siggnal)); |
8b93c638 JM |
5812 | annotate_signal_name_end (); |
5813 | ui_out_text (uiout, ", "); | |
5814 | annotate_signal_string (); | |
488f131b | 5815 | ui_out_field_string (uiout, "signal-meaning", |
33d62d64 | 5816 | target_signal_to_string (siggnal)); |
8b93c638 | 5817 | annotate_signal_string_end (); |
33d62d64 JK |
5818 | } |
5819 | ui_out_text (uiout, ".\n"); | |
5820 | } | |
252fbfc8 | 5821 | |
33d62d64 JK |
5822 | /* Reverse execution: target ran out of history info, print why the inferior |
5823 | has stopped. */ | |
252fbfc8 | 5824 | |
33d62d64 JK |
5825 | static void |
5826 | print_no_history_reason (void) | |
5827 | { | |
79a45e25 | 5828 | ui_out_text (current_uiout, "\nNo more reverse-execution history.\n"); |
11cf8741 | 5829 | } |
43ff13b4 | 5830 | |
c906108c SS |
5831 | /* Here to return control to GDB when the inferior stops for real. |
5832 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
5833 | ||
5834 | STOP_PRINT_FRAME nonzero means print the executing frame | |
5835 | (pc, function, args, file, line number and line text). | |
5836 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
5837 | attempting to insert breakpoints. */ | |
5838 | ||
5839 | void | |
96baa820 | 5840 | normal_stop (void) |
c906108c | 5841 | { |
73b65bb0 DJ |
5842 | struct target_waitstatus last; |
5843 | ptid_t last_ptid; | |
29f49a6a | 5844 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
73b65bb0 DJ |
5845 | |
5846 | get_last_target_status (&last_ptid, &last); | |
5847 | ||
29f49a6a PA |
5848 | /* If an exception is thrown from this point on, make sure to |
5849 | propagate GDB's knowledge of the executing state to the | |
5850 | frontend/user running state. A QUIT is an easy exception to see | |
5851 | here, so do this before any filtered output. */ | |
c35b1492 PA |
5852 | if (!non_stop) |
5853 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
5854 | else if (last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
5855 | && last.kind != TARGET_WAITKIND_EXITED |
5856 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c35b1492 | 5857 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); |
29f49a6a | 5858 | |
4f8d22e3 PA |
5859 | /* In non-stop mode, we don't want GDB to switch threads behind the |
5860 | user's back, to avoid races where the user is typing a command to | |
5861 | apply to thread x, but GDB switches to thread y before the user | |
5862 | finishes entering the command. */ | |
5863 | ||
c906108c SS |
5864 | /* As with the notification of thread events, we want to delay |
5865 | notifying the user that we've switched thread context until | |
5866 | the inferior actually stops. | |
5867 | ||
73b65bb0 DJ |
5868 | There's no point in saying anything if the inferior has exited. |
5869 | Note that SIGNALLED here means "exited with a signal", not | |
5870 | "received a signal". */ | |
4f8d22e3 PA |
5871 | if (!non_stop |
5872 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
5873 | && target_has_execution |
5874 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
5875 | && last.kind != TARGET_WAITKIND_EXITED |
5876 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c SS |
5877 | { |
5878 | target_terminal_ours_for_output (); | |
a3f17187 | 5879 | printf_filtered (_("[Switching to %s]\n"), |
c95310c6 | 5880 | target_pid_to_str (inferior_ptid)); |
b8fa951a | 5881 | annotate_thread_changed (); |
39f77062 | 5882 | previous_inferior_ptid = inferior_ptid; |
c906108c | 5883 | } |
c906108c | 5884 | |
0e5bf2a8 PA |
5885 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
5886 | { | |
5887 | gdb_assert (sync_execution || !target_can_async_p ()); | |
5888 | ||
5889 | target_terminal_ours_for_output (); | |
5890 | printf_filtered (_("No unwaited-for children left.\n")); | |
5891 | } | |
5892 | ||
74960c60 | 5893 | if (!breakpoints_always_inserted_mode () && target_has_execution) |
c906108c SS |
5894 | { |
5895 | if (remove_breakpoints ()) | |
5896 | { | |
5897 | target_terminal_ours_for_output (); | |
3e43a32a MS |
5898 | printf_filtered (_("Cannot remove breakpoints because " |
5899 | "program is no longer writable.\nFurther " | |
5900 | "execution is probably impossible.\n")); | |
c906108c SS |
5901 | } |
5902 | } | |
c906108c | 5903 | |
c906108c SS |
5904 | /* If an auto-display called a function and that got a signal, |
5905 | delete that auto-display to avoid an infinite recursion. */ | |
5906 | ||
5907 | if (stopped_by_random_signal) | |
5908 | disable_current_display (); | |
5909 | ||
5910 | /* Don't print a message if in the middle of doing a "step n" | |
5911 | operation for n > 1 */ | |
af679fd0 PA |
5912 | if (target_has_execution |
5913 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
5914 | && last.kind != TARGET_WAITKIND_EXITED | |
5915 | && inferior_thread ()->step_multi | |
16c381f0 | 5916 | && inferior_thread ()->control.stop_step) |
c906108c SS |
5917 | goto done; |
5918 | ||
5919 | target_terminal_ours (); | |
0f641c01 | 5920 | async_enable_stdin (); |
c906108c | 5921 | |
7abfe014 DJ |
5922 | /* Set the current source location. This will also happen if we |
5923 | display the frame below, but the current SAL will be incorrect | |
5924 | during a user hook-stop function. */ | |
d729566a | 5925 | if (has_stack_frames () && !stop_stack_dummy) |
7abfe014 DJ |
5926 | set_current_sal_from_frame (get_current_frame (), 1); |
5927 | ||
dd7e2d2b PA |
5928 | /* Let the user/frontend see the threads as stopped. */ |
5929 | do_cleanups (old_chain); | |
5930 | ||
5931 | /* Look up the hook_stop and run it (CLI internally handles problem | |
5932 | of stop_command's pre-hook not existing). */ | |
5933 | if (stop_command) | |
5934 | catch_errors (hook_stop_stub, stop_command, | |
5935 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
5936 | ||
d729566a | 5937 | if (!has_stack_frames ()) |
d51fd4c8 | 5938 | goto done; |
c906108c | 5939 | |
32400beb PA |
5940 | if (last.kind == TARGET_WAITKIND_SIGNALLED |
5941 | || last.kind == TARGET_WAITKIND_EXITED) | |
5942 | goto done; | |
5943 | ||
c906108c SS |
5944 | /* Select innermost stack frame - i.e., current frame is frame 0, |
5945 | and current location is based on that. | |
5946 | Don't do this on return from a stack dummy routine, | |
1777feb0 | 5947 | or if the program has exited. */ |
c906108c SS |
5948 | |
5949 | if (!stop_stack_dummy) | |
5950 | { | |
0f7d239c | 5951 | select_frame (get_current_frame ()); |
c906108c SS |
5952 | |
5953 | /* Print current location without a level number, if | |
c5aa993b JM |
5954 | we have changed functions or hit a breakpoint. |
5955 | Print source line if we have one. | |
5956 | bpstat_print() contains the logic deciding in detail | |
1777feb0 | 5957 | what to print, based on the event(s) that just occurred. */ |
c906108c | 5958 | |
d01a8610 AS |
5959 | /* If --batch-silent is enabled then there's no need to print the current |
5960 | source location, and to try risks causing an error message about | |
5961 | missing source files. */ | |
5962 | if (stop_print_frame && !batch_silent) | |
c906108c SS |
5963 | { |
5964 | int bpstat_ret; | |
5965 | int source_flag; | |
917317f4 | 5966 | int do_frame_printing = 1; |
347bddb7 | 5967 | struct thread_info *tp = inferior_thread (); |
c906108c | 5968 | |
36dfb11c | 5969 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, last.kind); |
917317f4 JM |
5970 | switch (bpstat_ret) |
5971 | { | |
5972 | case PRINT_UNKNOWN: | |
aa0cd9c1 | 5973 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
5974 | (or should) carry around the function and does (or |
5975 | should) use that when doing a frame comparison. */ | |
16c381f0 JK |
5976 | if (tp->control.stop_step |
5977 | && frame_id_eq (tp->control.step_frame_id, | |
aa0cd9c1 | 5978 | get_frame_id (get_current_frame ())) |
917317f4 | 5979 | && step_start_function == find_pc_function (stop_pc)) |
1777feb0 MS |
5980 | source_flag = SRC_LINE; /* Finished step, just |
5981 | print source line. */ | |
917317f4 | 5982 | else |
1777feb0 MS |
5983 | source_flag = SRC_AND_LOC; /* Print location and |
5984 | source line. */ | |
917317f4 JM |
5985 | break; |
5986 | case PRINT_SRC_AND_LOC: | |
1777feb0 MS |
5987 | source_flag = SRC_AND_LOC; /* Print location and |
5988 | source line. */ | |
917317f4 JM |
5989 | break; |
5990 | case PRINT_SRC_ONLY: | |
c5394b80 | 5991 | source_flag = SRC_LINE; |
917317f4 JM |
5992 | break; |
5993 | case PRINT_NOTHING: | |
488f131b | 5994 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
5995 | do_frame_printing = 0; |
5996 | break; | |
5997 | default: | |
e2e0b3e5 | 5998 | internal_error (__FILE__, __LINE__, _("Unknown value.")); |
917317f4 | 5999 | } |
c906108c SS |
6000 | |
6001 | /* The behavior of this routine with respect to the source | |
6002 | flag is: | |
c5394b80 JM |
6003 | SRC_LINE: Print only source line |
6004 | LOCATION: Print only location | |
1777feb0 | 6005 | SRC_AND_LOC: Print location and source line. */ |
917317f4 | 6006 | if (do_frame_printing) |
b04f3ab4 | 6007 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
6008 | |
6009 | /* Display the auto-display expressions. */ | |
6010 | do_displays (); | |
6011 | } | |
6012 | } | |
6013 | ||
6014 | /* Save the function value return registers, if we care. | |
6015 | We might be about to restore their previous contents. */ | |
9da8c2a0 PA |
6016 | if (inferior_thread ()->control.proceed_to_finish |
6017 | && execution_direction != EXEC_REVERSE) | |
d5c31457 UW |
6018 | { |
6019 | /* This should not be necessary. */ | |
6020 | if (stop_registers) | |
6021 | regcache_xfree (stop_registers); | |
6022 | ||
6023 | /* NB: The copy goes through to the target picking up the value of | |
6024 | all the registers. */ | |
6025 | stop_registers = regcache_dup (get_current_regcache ()); | |
6026 | } | |
c906108c | 6027 | |
aa7d318d | 6028 | if (stop_stack_dummy == STOP_STACK_DUMMY) |
c906108c | 6029 | { |
b89667eb DE |
6030 | /* Pop the empty frame that contains the stack dummy. |
6031 | This also restores inferior state prior to the call | |
16c381f0 | 6032 | (struct infcall_suspend_state). */ |
b89667eb | 6033 | struct frame_info *frame = get_current_frame (); |
abbb1732 | 6034 | |
b89667eb DE |
6035 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); |
6036 | frame_pop (frame); | |
3e43a32a MS |
6037 | /* frame_pop() calls reinit_frame_cache as the last thing it |
6038 | does which means there's currently no selected frame. We | |
6039 | don't need to re-establish a selected frame if the dummy call | |
6040 | returns normally, that will be done by | |
6041 | restore_infcall_control_state. However, we do have to handle | |
6042 | the case where the dummy call is returning after being | |
6043 | stopped (e.g. the dummy call previously hit a breakpoint). | |
6044 | We can't know which case we have so just always re-establish | |
6045 | a selected frame here. */ | |
0f7d239c | 6046 | select_frame (get_current_frame ()); |
c906108c SS |
6047 | } |
6048 | ||
c906108c SS |
6049 | done: |
6050 | annotate_stopped (); | |
41d2bdb4 PA |
6051 | |
6052 | /* Suppress the stop observer if we're in the middle of: | |
6053 | ||
6054 | - a step n (n > 1), as there still more steps to be done. | |
6055 | ||
6056 | - a "finish" command, as the observer will be called in | |
6057 | finish_command_continuation, so it can include the inferior | |
6058 | function's return value. | |
6059 | ||
6060 | - calling an inferior function, as we pretend we inferior didn't | |
6061 | run at all. The return value of the call is handled by the | |
6062 | expression evaluator, through call_function_by_hand. */ | |
6063 | ||
6064 | if (!target_has_execution | |
6065 | || last.kind == TARGET_WAITKIND_SIGNALLED | |
6066 | || last.kind == TARGET_WAITKIND_EXITED | |
0e5bf2a8 | 6067 | || last.kind == TARGET_WAITKIND_NO_RESUMED |
2ca0b532 PA |
6068 | || (!(inferior_thread ()->step_multi |
6069 | && inferior_thread ()->control.stop_step) | |
16c381f0 JK |
6070 | && !(inferior_thread ()->control.stop_bpstat |
6071 | && inferior_thread ()->control.proceed_to_finish) | |
6072 | && !inferior_thread ()->control.in_infcall)) | |
347bddb7 PA |
6073 | { |
6074 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
16c381f0 | 6075 | observer_notify_normal_stop (inferior_thread ()->control.stop_bpstat, |
1d33d6ba | 6076 | stop_print_frame); |
347bddb7 | 6077 | else |
1d33d6ba | 6078 | observer_notify_normal_stop (NULL, stop_print_frame); |
347bddb7 | 6079 | } |
347bddb7 | 6080 | |
48844aa6 PA |
6081 | if (target_has_execution) |
6082 | { | |
6083 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
6084 | && last.kind != TARGET_WAITKIND_EXITED) | |
6085 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
6086 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 6087 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 6088 | } |
6c95b8df PA |
6089 | |
6090 | /* Try to get rid of automatically added inferiors that are no | |
6091 | longer needed. Keeping those around slows down things linearly. | |
6092 | Note that this never removes the current inferior. */ | |
6093 | prune_inferiors (); | |
c906108c SS |
6094 | } |
6095 | ||
6096 | static int | |
96baa820 | 6097 | hook_stop_stub (void *cmd) |
c906108c | 6098 | { |
5913bcb0 | 6099 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
6100 | return (0); |
6101 | } | |
6102 | \f | |
c5aa993b | 6103 | int |
96baa820 | 6104 | signal_stop_state (int signo) |
c906108c | 6105 | { |
d6b48e9c | 6106 | return signal_stop[signo]; |
c906108c SS |
6107 | } |
6108 | ||
c5aa993b | 6109 | int |
96baa820 | 6110 | signal_print_state (int signo) |
c906108c SS |
6111 | { |
6112 | return signal_print[signo]; | |
6113 | } | |
6114 | ||
c5aa993b | 6115 | int |
96baa820 | 6116 | signal_pass_state (int signo) |
c906108c SS |
6117 | { |
6118 | return signal_program[signo]; | |
6119 | } | |
6120 | ||
2455069d UW |
6121 | static void |
6122 | signal_cache_update (int signo) | |
6123 | { | |
6124 | if (signo == -1) | |
6125 | { | |
6126 | for (signo = 0; signo < (int) TARGET_SIGNAL_LAST; signo++) | |
6127 | signal_cache_update (signo); | |
6128 | ||
6129 | return; | |
6130 | } | |
6131 | ||
6132 | signal_pass[signo] = (signal_stop[signo] == 0 | |
6133 | && signal_print[signo] == 0 | |
6134 | && signal_program[signo] == 1); | |
6135 | } | |
6136 | ||
488f131b | 6137 | int |
7bda5e4a | 6138 | signal_stop_update (int signo, int state) |
d4f3574e SS |
6139 | { |
6140 | int ret = signal_stop[signo]; | |
abbb1732 | 6141 | |
d4f3574e | 6142 | signal_stop[signo] = state; |
2455069d | 6143 | signal_cache_update (signo); |
d4f3574e SS |
6144 | return ret; |
6145 | } | |
6146 | ||
488f131b | 6147 | int |
7bda5e4a | 6148 | signal_print_update (int signo, int state) |
d4f3574e SS |
6149 | { |
6150 | int ret = signal_print[signo]; | |
abbb1732 | 6151 | |
d4f3574e | 6152 | signal_print[signo] = state; |
2455069d | 6153 | signal_cache_update (signo); |
d4f3574e SS |
6154 | return ret; |
6155 | } | |
6156 | ||
488f131b | 6157 | int |
7bda5e4a | 6158 | signal_pass_update (int signo, int state) |
d4f3574e SS |
6159 | { |
6160 | int ret = signal_program[signo]; | |
abbb1732 | 6161 | |
d4f3574e | 6162 | signal_program[signo] = state; |
2455069d | 6163 | signal_cache_update (signo); |
d4f3574e SS |
6164 | return ret; |
6165 | } | |
6166 | ||
c906108c | 6167 | static void |
96baa820 | 6168 | sig_print_header (void) |
c906108c | 6169 | { |
3e43a32a MS |
6170 | printf_filtered (_("Signal Stop\tPrint\tPass " |
6171 | "to program\tDescription\n")); | |
c906108c SS |
6172 | } |
6173 | ||
6174 | static void | |
96baa820 | 6175 | sig_print_info (enum target_signal oursig) |
c906108c | 6176 | { |
54363045 | 6177 | const char *name = target_signal_to_name (oursig); |
c906108c | 6178 | int name_padding = 13 - strlen (name); |
96baa820 | 6179 | |
c906108c SS |
6180 | if (name_padding <= 0) |
6181 | name_padding = 0; | |
6182 | ||
6183 | printf_filtered ("%s", name); | |
488f131b | 6184 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
6185 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
6186 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
6187 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
6188 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
6189 | } | |
6190 | ||
6191 | /* Specify how various signals in the inferior should be handled. */ | |
6192 | ||
6193 | static void | |
96baa820 | 6194 | handle_command (char *args, int from_tty) |
c906108c SS |
6195 | { |
6196 | char **argv; | |
6197 | int digits, wordlen; | |
6198 | int sigfirst, signum, siglast; | |
6199 | enum target_signal oursig; | |
6200 | int allsigs; | |
6201 | int nsigs; | |
6202 | unsigned char *sigs; | |
6203 | struct cleanup *old_chain; | |
6204 | ||
6205 | if (args == NULL) | |
6206 | { | |
e2e0b3e5 | 6207 | error_no_arg (_("signal to handle")); |
c906108c SS |
6208 | } |
6209 | ||
1777feb0 | 6210 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c SS |
6211 | |
6212 | nsigs = (int) TARGET_SIGNAL_LAST; | |
6213 | sigs = (unsigned char *) alloca (nsigs); | |
6214 | memset (sigs, 0, nsigs); | |
6215 | ||
1777feb0 | 6216 | /* Break the command line up into args. */ |
c906108c | 6217 | |
d1a41061 | 6218 | argv = gdb_buildargv (args); |
7a292a7a | 6219 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
6220 | |
6221 | /* Walk through the args, looking for signal oursigs, signal names, and | |
6222 | actions. Signal numbers and signal names may be interspersed with | |
6223 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 6224 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c SS |
6225 | |
6226 | while (*argv != NULL) | |
6227 | { | |
6228 | wordlen = strlen (*argv); | |
6229 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
6230 | {; | |
6231 | } | |
6232 | allsigs = 0; | |
6233 | sigfirst = siglast = -1; | |
6234 | ||
6235 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
6236 | { | |
6237 | /* Apply action to all signals except those used by the | |
1777feb0 | 6238 | debugger. Silently skip those. */ |
c906108c SS |
6239 | allsigs = 1; |
6240 | sigfirst = 0; | |
6241 | siglast = nsigs - 1; | |
6242 | } | |
6243 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
6244 | { | |
6245 | SET_SIGS (nsigs, sigs, signal_stop); | |
6246 | SET_SIGS (nsigs, sigs, signal_print); | |
6247 | } | |
6248 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
6249 | { | |
6250 | UNSET_SIGS (nsigs, sigs, signal_program); | |
6251 | } | |
6252 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
6253 | { | |
6254 | SET_SIGS (nsigs, sigs, signal_print); | |
6255 | } | |
6256 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
6257 | { | |
6258 | SET_SIGS (nsigs, sigs, signal_program); | |
6259 | } | |
6260 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
6261 | { | |
6262 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
6263 | } | |
6264 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
6265 | { | |
6266 | SET_SIGS (nsigs, sigs, signal_program); | |
6267 | } | |
6268 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
6269 | { | |
6270 | UNSET_SIGS (nsigs, sigs, signal_print); | |
6271 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
6272 | } | |
6273 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
6274 | { | |
6275 | UNSET_SIGS (nsigs, sigs, signal_program); | |
6276 | } | |
6277 | else if (digits > 0) | |
6278 | { | |
6279 | /* It is numeric. The numeric signal refers to our own | |
6280 | internal signal numbering from target.h, not to host/target | |
6281 | signal number. This is a feature; users really should be | |
6282 | using symbolic names anyway, and the common ones like | |
6283 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
6284 | ||
6285 | sigfirst = siglast = (int) | |
6286 | target_signal_from_command (atoi (*argv)); | |
6287 | if ((*argv)[digits] == '-') | |
6288 | { | |
6289 | siglast = (int) | |
6290 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
6291 | } | |
6292 | if (sigfirst > siglast) | |
6293 | { | |
1777feb0 | 6294 | /* Bet he didn't figure we'd think of this case... */ |
c906108c SS |
6295 | signum = sigfirst; |
6296 | sigfirst = siglast; | |
6297 | siglast = signum; | |
6298 | } | |
6299 | } | |
6300 | else | |
6301 | { | |
6302 | oursig = target_signal_from_name (*argv); | |
6303 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
6304 | { | |
6305 | sigfirst = siglast = (int) oursig; | |
6306 | } | |
6307 | else | |
6308 | { | |
6309 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 6310 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
6311 | } |
6312 | } | |
6313 | ||
6314 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 6315 | which signals to apply actions to. */ |
c906108c SS |
6316 | |
6317 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
6318 | { | |
6319 | switch ((enum target_signal) signum) | |
6320 | { | |
6321 | case TARGET_SIGNAL_TRAP: | |
6322 | case TARGET_SIGNAL_INT: | |
6323 | if (!allsigs && !sigs[signum]) | |
6324 | { | |
9e2f0ad4 | 6325 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a MS |
6326 | Are you sure you want to change it? "), |
6327 | target_signal_to_name ((enum target_signal) signum))) | |
c906108c SS |
6328 | { |
6329 | sigs[signum] = 1; | |
6330 | } | |
6331 | else | |
6332 | { | |
a3f17187 | 6333 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
6334 | gdb_flush (gdb_stdout); |
6335 | } | |
6336 | } | |
6337 | break; | |
6338 | case TARGET_SIGNAL_0: | |
6339 | case TARGET_SIGNAL_DEFAULT: | |
6340 | case TARGET_SIGNAL_UNKNOWN: | |
6341 | /* Make sure that "all" doesn't print these. */ | |
6342 | break; | |
6343 | default: | |
6344 | sigs[signum] = 1; | |
6345 | break; | |
6346 | } | |
6347 | } | |
6348 | ||
6349 | argv++; | |
6350 | } | |
6351 | ||
3a031f65 PA |
6352 | for (signum = 0; signum < nsigs; signum++) |
6353 | if (sigs[signum]) | |
6354 | { | |
2455069d UW |
6355 | signal_cache_update (-1); |
6356 | target_pass_signals ((int) TARGET_SIGNAL_LAST, signal_pass); | |
c906108c | 6357 | |
3a031f65 PA |
6358 | if (from_tty) |
6359 | { | |
6360 | /* Show the results. */ | |
6361 | sig_print_header (); | |
6362 | for (; signum < nsigs; signum++) | |
6363 | if (sigs[signum]) | |
6364 | sig_print_info (signum); | |
6365 | } | |
6366 | ||
6367 | break; | |
6368 | } | |
c906108c SS |
6369 | |
6370 | do_cleanups (old_chain); | |
6371 | } | |
6372 | ||
6373 | static void | |
96baa820 | 6374 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
6375 | { |
6376 | char **argv; | |
6377 | struct cleanup *old_chain; | |
6378 | ||
d1a41061 PP |
6379 | if (args == NULL) |
6380 | error_no_arg (_("xdb command")); | |
6381 | ||
1777feb0 | 6382 | /* Break the command line up into args. */ |
c906108c | 6383 | |
d1a41061 | 6384 | argv = gdb_buildargv (args); |
7a292a7a | 6385 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
6386 | if (argv[1] != (char *) NULL) |
6387 | { | |
6388 | char *argBuf; | |
6389 | int bufLen; | |
6390 | ||
6391 | bufLen = strlen (argv[0]) + 20; | |
6392 | argBuf = (char *) xmalloc (bufLen); | |
6393 | if (argBuf) | |
6394 | { | |
6395 | int validFlag = 1; | |
6396 | enum target_signal oursig; | |
6397 | ||
6398 | oursig = target_signal_from_name (argv[0]); | |
6399 | memset (argBuf, 0, bufLen); | |
6400 | if (strcmp (argv[1], "Q") == 0) | |
6401 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
6402 | else | |
6403 | { | |
6404 | if (strcmp (argv[1], "s") == 0) | |
6405 | { | |
6406 | if (!signal_stop[oursig]) | |
6407 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
6408 | else | |
6409 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
6410 | } | |
6411 | else if (strcmp (argv[1], "i") == 0) | |
6412 | { | |
6413 | if (!signal_program[oursig]) | |
6414 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
6415 | else | |
6416 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
6417 | } | |
6418 | else if (strcmp (argv[1], "r") == 0) | |
6419 | { | |
6420 | if (!signal_print[oursig]) | |
6421 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
6422 | else | |
6423 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
6424 | } | |
6425 | else | |
6426 | validFlag = 0; | |
6427 | } | |
6428 | if (validFlag) | |
6429 | handle_command (argBuf, from_tty); | |
6430 | else | |
a3f17187 | 6431 | printf_filtered (_("Invalid signal handling flag.\n")); |
c906108c | 6432 | if (argBuf) |
b8c9b27d | 6433 | xfree (argBuf); |
c906108c SS |
6434 | } |
6435 | } | |
6436 | do_cleanups (old_chain); | |
6437 | } | |
6438 | ||
6439 | /* Print current contents of the tables set by the handle command. | |
6440 | It is possible we should just be printing signals actually used | |
6441 | by the current target (but for things to work right when switching | |
6442 | targets, all signals should be in the signal tables). */ | |
6443 | ||
6444 | static void | |
96baa820 | 6445 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
6446 | { |
6447 | enum target_signal oursig; | |
abbb1732 | 6448 | |
c906108c SS |
6449 | sig_print_header (); |
6450 | ||
6451 | if (signum_exp) | |
6452 | { | |
6453 | /* First see if this is a symbol name. */ | |
6454 | oursig = target_signal_from_name (signum_exp); | |
6455 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
6456 | { | |
6457 | /* No, try numeric. */ | |
6458 | oursig = | |
bb518678 | 6459 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
6460 | } |
6461 | sig_print_info (oursig); | |
6462 | return; | |
6463 | } | |
6464 | ||
6465 | printf_filtered ("\n"); | |
6466 | /* These ugly casts brought to you by the native VAX compiler. */ | |
6467 | for (oursig = TARGET_SIGNAL_FIRST; | |
6468 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
6469 | oursig = (enum target_signal) ((int) oursig + 1)) | |
6470 | { | |
6471 | QUIT; | |
6472 | ||
6473 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 6474 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
6475 | sig_print_info (oursig); |
6476 | } | |
6477 | ||
3e43a32a MS |
6478 | printf_filtered (_("\nUse the \"handle\" command " |
6479 | "to change these tables.\n")); | |
c906108c | 6480 | } |
4aa995e1 | 6481 | |
c709acd1 PA |
6482 | /* Check if it makes sense to read $_siginfo from the current thread |
6483 | at this point. If not, throw an error. */ | |
6484 | ||
6485 | static void | |
6486 | validate_siginfo_access (void) | |
6487 | { | |
6488 | /* No current inferior, no siginfo. */ | |
6489 | if (ptid_equal (inferior_ptid, null_ptid)) | |
6490 | error (_("No thread selected.")); | |
6491 | ||
6492 | /* Don't try to read from a dead thread. */ | |
6493 | if (is_exited (inferior_ptid)) | |
6494 | error (_("The current thread has terminated")); | |
6495 | ||
6496 | /* ... or from a spinning thread. */ | |
6497 | if (is_running (inferior_ptid)) | |
6498 | error (_("Selected thread is running.")); | |
6499 | } | |
6500 | ||
4aa995e1 PA |
6501 | /* The $_siginfo convenience variable is a bit special. We don't know |
6502 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 6503 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
6504 | also dependent on which thread you have selected. |
6505 | ||
6506 | 1. making $_siginfo be an internalvar that creates a new value on | |
6507 | access. | |
6508 | ||
6509 | 2. making the value of $_siginfo be an lval_computed value. */ | |
6510 | ||
6511 | /* This function implements the lval_computed support for reading a | |
6512 | $_siginfo value. */ | |
6513 | ||
6514 | static void | |
6515 | siginfo_value_read (struct value *v) | |
6516 | { | |
6517 | LONGEST transferred; | |
6518 | ||
c709acd1 PA |
6519 | validate_siginfo_access (); |
6520 | ||
4aa995e1 PA |
6521 | transferred = |
6522 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
6523 | NULL, | |
6524 | value_contents_all_raw (v), | |
6525 | value_offset (v), | |
6526 | TYPE_LENGTH (value_type (v))); | |
6527 | ||
6528 | if (transferred != TYPE_LENGTH (value_type (v))) | |
6529 | error (_("Unable to read siginfo")); | |
6530 | } | |
6531 | ||
6532 | /* This function implements the lval_computed support for writing a | |
6533 | $_siginfo value. */ | |
6534 | ||
6535 | static void | |
6536 | siginfo_value_write (struct value *v, struct value *fromval) | |
6537 | { | |
6538 | LONGEST transferred; | |
6539 | ||
c709acd1 PA |
6540 | validate_siginfo_access (); |
6541 | ||
4aa995e1 PA |
6542 | transferred = target_write (¤t_target, |
6543 | TARGET_OBJECT_SIGNAL_INFO, | |
6544 | NULL, | |
6545 | value_contents_all_raw (fromval), | |
6546 | value_offset (v), | |
6547 | TYPE_LENGTH (value_type (fromval))); | |
6548 | ||
6549 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
6550 | error (_("Unable to write siginfo")); | |
6551 | } | |
6552 | ||
c8f2448a | 6553 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
6554 | { |
6555 | siginfo_value_read, | |
6556 | siginfo_value_write | |
6557 | }; | |
6558 | ||
6559 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
6560 | the current thread using architecture GDBARCH. Return a void value |
6561 | if there's no object available. */ | |
4aa995e1 | 6562 | |
2c0b251b | 6563 | static struct value * |
78267919 | 6564 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var) |
4aa995e1 | 6565 | { |
4aa995e1 | 6566 | if (target_has_stack |
78267919 UW |
6567 | && !ptid_equal (inferior_ptid, null_ptid) |
6568 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
4aa995e1 | 6569 | { |
78267919 | 6570 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 6571 | |
78267919 | 6572 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
6573 | } |
6574 | ||
78267919 | 6575 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
6576 | } |
6577 | ||
c906108c | 6578 | \f |
16c381f0 JK |
6579 | /* infcall_suspend_state contains state about the program itself like its |
6580 | registers and any signal it received when it last stopped. | |
6581 | This state must be restored regardless of how the inferior function call | |
6582 | ends (either successfully, or after it hits a breakpoint or signal) | |
6583 | if the program is to properly continue where it left off. */ | |
6584 | ||
6585 | struct infcall_suspend_state | |
7a292a7a | 6586 | { |
16c381f0 JK |
6587 | struct thread_suspend_state thread_suspend; |
6588 | struct inferior_suspend_state inferior_suspend; | |
6589 | ||
6590 | /* Other fields: */ | |
7a292a7a | 6591 | CORE_ADDR stop_pc; |
b89667eb | 6592 | struct regcache *registers; |
1736ad11 | 6593 | |
35515841 | 6594 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
1736ad11 JK |
6595 | struct gdbarch *siginfo_gdbarch; |
6596 | ||
6597 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
6598 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
6599 | content would be invalid. */ | |
6600 | gdb_byte *siginfo_data; | |
b89667eb DE |
6601 | }; |
6602 | ||
16c381f0 JK |
6603 | struct infcall_suspend_state * |
6604 | save_infcall_suspend_state (void) | |
b89667eb | 6605 | { |
16c381f0 | 6606 | struct infcall_suspend_state *inf_state; |
b89667eb | 6607 | struct thread_info *tp = inferior_thread (); |
16c381f0 | 6608 | struct inferior *inf = current_inferior (); |
1736ad11 JK |
6609 | struct regcache *regcache = get_current_regcache (); |
6610 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
6611 | gdb_byte *siginfo_data = NULL; | |
6612 | ||
6613 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
6614 | { | |
6615 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
6616 | size_t len = TYPE_LENGTH (type); | |
6617 | struct cleanup *back_to; | |
6618 | ||
6619 | siginfo_data = xmalloc (len); | |
6620 | back_to = make_cleanup (xfree, siginfo_data); | |
6621 | ||
6622 | if (target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6623 | siginfo_data, 0, len) == len) | |
6624 | discard_cleanups (back_to); | |
6625 | else | |
6626 | { | |
6627 | /* Errors ignored. */ | |
6628 | do_cleanups (back_to); | |
6629 | siginfo_data = NULL; | |
6630 | } | |
6631 | } | |
6632 | ||
16c381f0 | 6633 | inf_state = XZALLOC (struct infcall_suspend_state); |
1736ad11 JK |
6634 | |
6635 | if (siginfo_data) | |
6636 | { | |
6637 | inf_state->siginfo_gdbarch = gdbarch; | |
6638 | inf_state->siginfo_data = siginfo_data; | |
6639 | } | |
b89667eb | 6640 | |
16c381f0 JK |
6641 | inf_state->thread_suspend = tp->suspend; |
6642 | inf_state->inferior_suspend = inf->suspend; | |
6643 | ||
35515841 JK |
6644 | /* run_inferior_call will not use the signal due to its `proceed' call with |
6645 | TARGET_SIGNAL_0 anyway. */ | |
16c381f0 | 6646 | tp->suspend.stop_signal = TARGET_SIGNAL_0; |
35515841 | 6647 | |
b89667eb DE |
6648 | inf_state->stop_pc = stop_pc; |
6649 | ||
1736ad11 | 6650 | inf_state->registers = regcache_dup (regcache); |
b89667eb DE |
6651 | |
6652 | return inf_state; | |
6653 | } | |
6654 | ||
6655 | /* Restore inferior session state to INF_STATE. */ | |
6656 | ||
6657 | void | |
16c381f0 | 6658 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
6659 | { |
6660 | struct thread_info *tp = inferior_thread (); | |
16c381f0 | 6661 | struct inferior *inf = current_inferior (); |
1736ad11 JK |
6662 | struct regcache *regcache = get_current_regcache (); |
6663 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
b89667eb | 6664 | |
16c381f0 JK |
6665 | tp->suspend = inf_state->thread_suspend; |
6666 | inf->suspend = inf_state->inferior_suspend; | |
6667 | ||
b89667eb DE |
6668 | stop_pc = inf_state->stop_pc; |
6669 | ||
1736ad11 JK |
6670 | if (inf_state->siginfo_gdbarch == gdbarch) |
6671 | { | |
6672 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
6673 | size_t len = TYPE_LENGTH (type); | |
6674 | ||
6675 | /* Errors ignored. */ | |
6676 | target_write (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6677 | inf_state->siginfo_data, 0, len); | |
6678 | } | |
6679 | ||
b89667eb DE |
6680 | /* The inferior can be gone if the user types "print exit(0)" |
6681 | (and perhaps other times). */ | |
6682 | if (target_has_execution) | |
6683 | /* NB: The register write goes through to the target. */ | |
1736ad11 | 6684 | regcache_cpy (regcache, inf_state->registers); |
803b5f95 | 6685 | |
16c381f0 | 6686 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
6687 | } |
6688 | ||
6689 | static void | |
16c381f0 | 6690 | do_restore_infcall_suspend_state_cleanup (void *state) |
b89667eb | 6691 | { |
16c381f0 | 6692 | restore_infcall_suspend_state (state); |
b89667eb DE |
6693 | } |
6694 | ||
6695 | struct cleanup * | |
16c381f0 JK |
6696 | make_cleanup_restore_infcall_suspend_state |
6697 | (struct infcall_suspend_state *inf_state) | |
b89667eb | 6698 | { |
16c381f0 | 6699 | return make_cleanup (do_restore_infcall_suspend_state_cleanup, inf_state); |
b89667eb DE |
6700 | } |
6701 | ||
6702 | void | |
16c381f0 | 6703 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
6704 | { |
6705 | regcache_xfree (inf_state->registers); | |
803b5f95 | 6706 | xfree (inf_state->siginfo_data); |
b89667eb DE |
6707 | xfree (inf_state); |
6708 | } | |
6709 | ||
6710 | struct regcache * | |
16c381f0 | 6711 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb DE |
6712 | { |
6713 | return inf_state->registers; | |
6714 | } | |
6715 | ||
16c381f0 JK |
6716 | /* infcall_control_state contains state regarding gdb's control of the |
6717 | inferior itself like stepping control. It also contains session state like | |
6718 | the user's currently selected frame. */ | |
b89667eb | 6719 | |
16c381f0 | 6720 | struct infcall_control_state |
b89667eb | 6721 | { |
16c381f0 JK |
6722 | struct thread_control_state thread_control; |
6723 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
6724 | |
6725 | /* Other fields: */ | |
6726 | enum stop_stack_kind stop_stack_dummy; | |
6727 | int stopped_by_random_signal; | |
7a292a7a | 6728 | int stop_after_trap; |
7a292a7a | 6729 | |
b89667eb | 6730 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe | 6731 | struct frame_id selected_frame_id; |
7a292a7a SS |
6732 | }; |
6733 | ||
c906108c | 6734 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 6735 | connection. */ |
c906108c | 6736 | |
16c381f0 JK |
6737 | struct infcall_control_state * |
6738 | save_infcall_control_state (void) | |
c906108c | 6739 | { |
16c381f0 | 6740 | struct infcall_control_state *inf_status = xmalloc (sizeof (*inf_status)); |
4e1c45ea | 6741 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 6742 | struct inferior *inf = current_inferior (); |
7a292a7a | 6743 | |
16c381f0 JK |
6744 | inf_status->thread_control = tp->control; |
6745 | inf_status->inferior_control = inf->control; | |
d82142e2 | 6746 | |
8358c15c | 6747 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 6748 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 6749 | |
16c381f0 JK |
6750 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
6751 | chain. If caller's caller is walking the chain, they'll be happier if we | |
6752 | hand them back the original chain when restore_infcall_control_state is | |
6753 | called. */ | |
6754 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
6755 | |
6756 | /* Other fields: */ | |
6757 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
6758 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
6759 | inf_status->stop_after_trap = stop_after_trap; | |
c5aa993b | 6760 | |
206415a3 | 6761 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 6762 | |
7a292a7a | 6763 | return inf_status; |
c906108c SS |
6764 | } |
6765 | ||
c906108c | 6766 | static int |
96baa820 | 6767 | restore_selected_frame (void *args) |
c906108c | 6768 | { |
488f131b | 6769 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 6770 | struct frame_info *frame; |
c906108c | 6771 | |
101dcfbe | 6772 | frame = frame_find_by_id (*fid); |
c906108c | 6773 | |
aa0cd9c1 AC |
6774 | /* If inf_status->selected_frame_id is NULL, there was no previously |
6775 | selected frame. */ | |
101dcfbe | 6776 | if (frame == NULL) |
c906108c | 6777 | { |
8a3fe4f8 | 6778 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
6779 | return 0; |
6780 | } | |
6781 | ||
0f7d239c | 6782 | select_frame (frame); |
c906108c SS |
6783 | |
6784 | return (1); | |
6785 | } | |
6786 | ||
b89667eb DE |
6787 | /* Restore inferior session state to INF_STATUS. */ |
6788 | ||
c906108c | 6789 | void |
16c381f0 | 6790 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 6791 | { |
4e1c45ea | 6792 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 6793 | struct inferior *inf = current_inferior (); |
4e1c45ea | 6794 | |
8358c15c JK |
6795 | if (tp->control.step_resume_breakpoint) |
6796 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
6797 | ||
5b79abe7 TT |
6798 | if (tp->control.exception_resume_breakpoint) |
6799 | tp->control.exception_resume_breakpoint->disposition | |
6800 | = disp_del_at_next_stop; | |
6801 | ||
d82142e2 | 6802 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 6803 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 6804 | |
16c381f0 JK |
6805 | tp->control = inf_status->thread_control; |
6806 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
6807 | |
6808 | /* Other fields: */ | |
6809 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
6810 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
6811 | stop_after_trap = inf_status->stop_after_trap; | |
c906108c | 6812 | |
b89667eb | 6813 | if (target_has_stack) |
c906108c | 6814 | { |
c906108c | 6815 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
6816 | walking the stack might encounter a garbage pointer and |
6817 | error() trying to dereference it. */ | |
488f131b JB |
6818 | if (catch_errors |
6819 | (restore_selected_frame, &inf_status->selected_frame_id, | |
6820 | "Unable to restore previously selected frame:\n", | |
6821 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
6822 | /* Error in restoring the selected frame. Select the innermost |
6823 | frame. */ | |
0f7d239c | 6824 | select_frame (get_current_frame ()); |
c906108c | 6825 | } |
c906108c | 6826 | |
72cec141 | 6827 | xfree (inf_status); |
7a292a7a | 6828 | } |
c906108c | 6829 | |
74b7792f | 6830 | static void |
16c381f0 | 6831 | do_restore_infcall_control_state_cleanup (void *sts) |
74b7792f | 6832 | { |
16c381f0 | 6833 | restore_infcall_control_state (sts); |
74b7792f AC |
6834 | } |
6835 | ||
6836 | struct cleanup * | |
16c381f0 JK |
6837 | make_cleanup_restore_infcall_control_state |
6838 | (struct infcall_control_state *inf_status) | |
74b7792f | 6839 | { |
16c381f0 | 6840 | return make_cleanup (do_restore_infcall_control_state_cleanup, inf_status); |
74b7792f AC |
6841 | } |
6842 | ||
c906108c | 6843 | void |
16c381f0 | 6844 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 6845 | { |
8358c15c JK |
6846 | if (inf_status->thread_control.step_resume_breakpoint) |
6847 | inf_status->thread_control.step_resume_breakpoint->disposition | |
6848 | = disp_del_at_next_stop; | |
6849 | ||
5b79abe7 TT |
6850 | if (inf_status->thread_control.exception_resume_breakpoint) |
6851 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
6852 | = disp_del_at_next_stop; | |
6853 | ||
1777feb0 | 6854 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 6855 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 6856 | |
72cec141 | 6857 | xfree (inf_status); |
7a292a7a | 6858 | } |
b89667eb | 6859 | \f |
0723dbf5 PA |
6860 | int |
6861 | ptid_match (ptid_t ptid, ptid_t filter) | |
6862 | { | |
0723dbf5 PA |
6863 | if (ptid_equal (filter, minus_one_ptid)) |
6864 | return 1; | |
6865 | if (ptid_is_pid (filter) | |
6866 | && ptid_get_pid (ptid) == ptid_get_pid (filter)) | |
6867 | return 1; | |
6868 | else if (ptid_equal (ptid, filter)) | |
6869 | return 1; | |
6870 | ||
6871 | return 0; | |
6872 | } | |
6873 | ||
ca6724c1 KB |
6874 | /* restore_inferior_ptid() will be used by the cleanup machinery |
6875 | to restore the inferior_ptid value saved in a call to | |
6876 | save_inferior_ptid(). */ | |
ce696e05 KB |
6877 | |
6878 | static void | |
6879 | restore_inferior_ptid (void *arg) | |
6880 | { | |
6881 | ptid_t *saved_ptid_ptr = arg; | |
abbb1732 | 6882 | |
ce696e05 KB |
6883 | inferior_ptid = *saved_ptid_ptr; |
6884 | xfree (arg); | |
6885 | } | |
6886 | ||
6887 | /* Save the value of inferior_ptid so that it may be restored by a | |
6888 | later call to do_cleanups(). Returns the struct cleanup pointer | |
6889 | needed for later doing the cleanup. */ | |
6890 | ||
6891 | struct cleanup * | |
6892 | save_inferior_ptid (void) | |
6893 | { | |
6894 | ptid_t *saved_ptid_ptr; | |
6895 | ||
6896 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
6897 | *saved_ptid_ptr = inferior_ptid; | |
6898 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
6899 | } | |
c5aa993b | 6900 | \f |
488f131b | 6901 | |
b2175913 MS |
6902 | /* User interface for reverse debugging: |
6903 | Set exec-direction / show exec-direction commands | |
6904 | (returns error unless target implements to_set_exec_direction method). */ | |
6905 | ||
32231432 | 6906 | int execution_direction = EXEC_FORWARD; |
b2175913 MS |
6907 | static const char exec_forward[] = "forward"; |
6908 | static const char exec_reverse[] = "reverse"; | |
6909 | static const char *exec_direction = exec_forward; | |
40478521 | 6910 | static const char *const exec_direction_names[] = { |
b2175913 MS |
6911 | exec_forward, |
6912 | exec_reverse, | |
6913 | NULL | |
6914 | }; | |
6915 | ||
6916 | static void | |
6917 | set_exec_direction_func (char *args, int from_tty, | |
6918 | struct cmd_list_element *cmd) | |
6919 | { | |
6920 | if (target_can_execute_reverse) | |
6921 | { | |
6922 | if (!strcmp (exec_direction, exec_forward)) | |
6923 | execution_direction = EXEC_FORWARD; | |
6924 | else if (!strcmp (exec_direction, exec_reverse)) | |
6925 | execution_direction = EXEC_REVERSE; | |
6926 | } | |
8bbed405 MS |
6927 | else |
6928 | { | |
6929 | exec_direction = exec_forward; | |
6930 | error (_("Target does not support this operation.")); | |
6931 | } | |
b2175913 MS |
6932 | } |
6933 | ||
6934 | static void | |
6935 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
6936 | struct cmd_list_element *cmd, const char *value) | |
6937 | { | |
6938 | switch (execution_direction) { | |
6939 | case EXEC_FORWARD: | |
6940 | fprintf_filtered (out, _("Forward.\n")); | |
6941 | break; | |
6942 | case EXEC_REVERSE: | |
6943 | fprintf_filtered (out, _("Reverse.\n")); | |
6944 | break; | |
b2175913 | 6945 | default: |
d8b34453 PA |
6946 | internal_error (__FILE__, __LINE__, |
6947 | _("bogus execution_direction value: %d"), | |
6948 | (int) execution_direction); | |
b2175913 MS |
6949 | } |
6950 | } | |
6951 | ||
6952 | /* User interface for non-stop mode. */ | |
6953 | ||
ad52ddc6 | 6954 | int non_stop = 0; |
ad52ddc6 PA |
6955 | |
6956 | static void | |
6957 | set_non_stop (char *args, int from_tty, | |
6958 | struct cmd_list_element *c) | |
6959 | { | |
6960 | if (target_has_execution) | |
6961 | { | |
6962 | non_stop_1 = non_stop; | |
6963 | error (_("Cannot change this setting while the inferior is running.")); | |
6964 | } | |
6965 | ||
6966 | non_stop = non_stop_1; | |
6967 | } | |
6968 | ||
6969 | static void | |
6970 | show_non_stop (struct ui_file *file, int from_tty, | |
6971 | struct cmd_list_element *c, const char *value) | |
6972 | { | |
6973 | fprintf_filtered (file, | |
6974 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
6975 | value); | |
6976 | } | |
6977 | ||
d4db2f36 PA |
6978 | static void |
6979 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
6980 | struct cmd_list_element *c, const char *value) | |
6981 | { | |
3e43a32a MS |
6982 | fprintf_filtered (file, _("Resuming the execution of threads " |
6983 | "of all processes is %s.\n"), value); | |
d4db2f36 | 6984 | } |
ad52ddc6 | 6985 | |
c906108c | 6986 | void |
96baa820 | 6987 | _initialize_infrun (void) |
c906108c | 6988 | { |
52f0bd74 AC |
6989 | int i; |
6990 | int numsigs; | |
c906108c | 6991 | |
1bedd215 AC |
6992 | add_info ("signals", signals_info, _("\ |
6993 | What debugger does when program gets various signals.\n\ | |
6994 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
6995 | add_info_alias ("handle", "signals", 0); |
6996 | ||
1bedd215 AC |
6997 | add_com ("handle", class_run, handle_command, _("\ |
6998 | Specify how to handle a signal.\n\ | |
c906108c SS |
6999 | Args are signals and actions to apply to those signals.\n\ |
7000 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
7001 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
7002 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
7003 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
7004 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
7005 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
c906108c SS |
7006 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
7007 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
7008 | Print means print a message if this signal happens.\n\ | |
7009 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
7010 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 7011 | Pass and Stop may be combined.")); |
c906108c SS |
7012 | if (xdb_commands) |
7013 | { | |
1bedd215 AC |
7014 | add_com ("lz", class_info, signals_info, _("\ |
7015 | What debugger does when program gets various signals.\n\ | |
7016 | Specify a signal as argument to print info on that signal only.")); | |
7017 | add_com ("z", class_run, xdb_handle_command, _("\ | |
7018 | Specify how to handle a signal.\n\ | |
c906108c SS |
7019 | Args are signals and actions to apply to those signals.\n\ |
7020 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
7021 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
7022 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
7023 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 7024 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
cce7e648 | 7025 | Recognized actions include \"s\" (toggles between stop and nostop),\n\ |
c906108c SS |
7026 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
7027 | nopass), \"Q\" (noprint)\n\ | |
7028 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
7029 | Print means print a message if this signal happens.\n\ | |
7030 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
7031 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 7032 | Pass and Stop may be combined.")); |
c906108c SS |
7033 | } |
7034 | ||
7035 | if (!dbx_commands) | |
1a966eab AC |
7036 | stop_command = add_cmd ("stop", class_obscure, |
7037 | not_just_help_class_command, _("\ | |
7038 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 7039 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 7040 | of the program stops."), &cmdlist); |
c906108c | 7041 | |
85c07804 AC |
7042 | add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
7043 | Set inferior debugging."), _("\ | |
7044 | Show inferior debugging."), _("\ | |
7045 | When non-zero, inferior specific debugging is enabled."), | |
7046 | NULL, | |
920d2a44 | 7047 | show_debug_infrun, |
85c07804 | 7048 | &setdebuglist, &showdebuglist); |
527159b7 | 7049 | |
3e43a32a MS |
7050 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
7051 | &debug_displaced, _("\ | |
237fc4c9 PA |
7052 | Set displaced stepping debugging."), _("\ |
7053 | Show displaced stepping debugging."), _("\ | |
7054 | When non-zero, displaced stepping specific debugging is enabled."), | |
7055 | NULL, | |
7056 | show_debug_displaced, | |
7057 | &setdebuglist, &showdebuglist); | |
7058 | ||
ad52ddc6 PA |
7059 | add_setshow_boolean_cmd ("non-stop", no_class, |
7060 | &non_stop_1, _("\ | |
7061 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
7062 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
7063 | When debugging a multi-threaded program and this setting is\n\ | |
7064 | off (the default, also called all-stop mode), when one thread stops\n\ | |
7065 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
7066 | all other threads in the program while you interact with the thread of\n\ | |
7067 | interest. When you continue or step a thread, you can allow the other\n\ | |
7068 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
7069 | thread's state, all threads stop.\n\ | |
7070 | \n\ | |
7071 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
7072 | to run freely. You'll be able to step each thread independently,\n\ | |
7073 | leave it stopped or free to run as needed."), | |
7074 | set_non_stop, | |
7075 | show_non_stop, | |
7076 | &setlist, | |
7077 | &showlist); | |
7078 | ||
c906108c | 7079 | numsigs = (int) TARGET_SIGNAL_LAST; |
488f131b | 7080 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
7081 | signal_print = (unsigned char *) |
7082 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
7083 | signal_program = (unsigned char *) | |
7084 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
2455069d UW |
7085 | signal_pass = (unsigned char *) |
7086 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
c906108c SS |
7087 | for (i = 0; i < numsigs; i++) |
7088 | { | |
7089 | signal_stop[i] = 1; | |
7090 | signal_print[i] = 1; | |
7091 | signal_program[i] = 1; | |
7092 | } | |
7093 | ||
7094 | /* Signals caused by debugger's own actions | |
7095 | should not be given to the program afterwards. */ | |
7096 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
7097 | signal_program[TARGET_SIGNAL_INT] = 0; | |
7098 | ||
7099 | /* Signals that are not errors should not normally enter the debugger. */ | |
7100 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
7101 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
7102 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
7103 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
7104 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
7105 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
7106 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
7107 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
7108 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
7109 | signal_print[TARGET_SIGNAL_IO] = 0; | |
7110 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
7111 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
7112 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
7113 | signal_print[TARGET_SIGNAL_URG] = 0; | |
7114 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
7115 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
16dfc9ce JB |
7116 | signal_stop[TARGET_SIGNAL_PRIO] = 0; |
7117 | signal_print[TARGET_SIGNAL_PRIO] = 0; | |
c906108c | 7118 | |
cd0fc7c3 SS |
7119 | /* These signals are used internally by user-level thread |
7120 | implementations. (See signal(5) on Solaris.) Like the above | |
7121 | signals, a healthy program receives and handles them as part of | |
7122 | its normal operation. */ | |
7123 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
7124 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
7125 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
7126 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
7127 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
7128 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
7129 | ||
2455069d UW |
7130 | /* Update cached state. */ |
7131 | signal_cache_update (-1); | |
7132 | ||
85c07804 AC |
7133 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
7134 | &stop_on_solib_events, _("\ | |
7135 | Set stopping for shared library events."), _("\ | |
7136 | Show stopping for shared library events."), _("\ | |
c906108c SS |
7137 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
7138 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 AC |
7139 | to the user would be loading/unloading of a new library."), |
7140 | NULL, | |
920d2a44 | 7141 | show_stop_on_solib_events, |
85c07804 | 7142 | &setlist, &showlist); |
c906108c | 7143 | |
7ab04401 AC |
7144 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
7145 | follow_fork_mode_kind_names, | |
7146 | &follow_fork_mode_string, _("\ | |
7147 | Set debugger response to a program call of fork or vfork."), _("\ | |
7148 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
7149 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
7150 | parent - the original process is debugged after a fork\n\ | |
7151 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 7152 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
7153 | By default, the debugger will follow the parent process."), |
7154 | NULL, | |
920d2a44 | 7155 | show_follow_fork_mode_string, |
7ab04401 AC |
7156 | &setlist, &showlist); |
7157 | ||
6c95b8df PA |
7158 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
7159 | follow_exec_mode_names, | |
7160 | &follow_exec_mode_string, _("\ | |
7161 | Set debugger response to a program call of exec."), _("\ | |
7162 | Show debugger response to a program call of exec."), _("\ | |
7163 | An exec call replaces the program image of a process.\n\ | |
7164 | \n\ | |
7165 | follow-exec-mode can be:\n\ | |
7166 | \n\ | |
cce7e648 | 7167 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
7168 | to this new inferior. The program the process was running before\n\ |
7169 | the exec call can be restarted afterwards by restarting the original\n\ | |
7170 | inferior.\n\ | |
7171 | \n\ | |
7172 | same - the debugger keeps the process bound to the same inferior.\n\ | |
7173 | The new executable image replaces the previous executable loaded in\n\ | |
7174 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
7175 | the executable the process was running after the exec call.\n\ | |
7176 | \n\ | |
7177 | By default, the debugger will use the same inferior."), | |
7178 | NULL, | |
7179 | show_follow_exec_mode_string, | |
7180 | &setlist, &showlist); | |
7181 | ||
7ab04401 AC |
7182 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
7183 | scheduler_enums, &scheduler_mode, _("\ | |
7184 | Set mode for locking scheduler during execution."), _("\ | |
7185 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
7186 | off == no locking (threads may preempt at any time)\n\ |
7187 | on == full locking (no thread except the current thread may run)\n\ | |
7188 | step == scheduler locked during every single-step operation.\n\ | |
7189 | In this mode, no other thread may run during a step command.\n\ | |
7ab04401 AC |
7190 | Other threads may run while stepping over a function call ('next')."), |
7191 | set_schedlock_func, /* traps on target vector */ | |
920d2a44 | 7192 | show_scheduler_mode, |
7ab04401 | 7193 | &setlist, &showlist); |
5fbbeb29 | 7194 | |
d4db2f36 PA |
7195 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
7196 | Set mode for resuming threads of all processes."), _("\ | |
7197 | Show mode for resuming threads of all processes."), _("\ | |
7198 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
7199 | threads of all processes. When off (which is the default), execution\n\ | |
7200 | commands only resume the threads of the current process. The set of\n\ | |
7201 | threads that are resumed is further refined by the scheduler-locking\n\ | |
7202 | mode (see help set scheduler-locking)."), | |
7203 | NULL, | |
7204 | show_schedule_multiple, | |
7205 | &setlist, &showlist); | |
7206 | ||
5bf193a2 AC |
7207 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
7208 | Set mode of the step operation."), _("\ | |
7209 | Show mode of the step operation."), _("\ | |
7210 | When set, doing a step over a function without debug line information\n\ | |
7211 | will stop at the first instruction of that function. Otherwise, the\n\ | |
7212 | function is skipped and the step command stops at a different source line."), | |
7213 | NULL, | |
920d2a44 | 7214 | show_step_stop_if_no_debug, |
5bf193a2 | 7215 | &setlist, &showlist); |
ca6724c1 | 7216 | |
fff08868 HZ |
7217 | add_setshow_enum_cmd ("displaced-stepping", class_run, |
7218 | can_use_displaced_stepping_enum, | |
7219 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
7220 | Set debugger's willingness to use displaced stepping."), _("\ |
7221 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
7222 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
7223 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
7224 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
7225 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
7226 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
7227 | use it in all-stop mode (see help set non-stop)."), | |
7228 | NULL, | |
7229 | show_can_use_displaced_stepping, | |
7230 | &setlist, &showlist); | |
237fc4c9 | 7231 | |
b2175913 MS |
7232 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
7233 | &exec_direction, _("Set direction of execution.\n\ | |
7234 | Options are 'forward' or 'reverse'."), | |
7235 | _("Show direction of execution (forward/reverse)."), | |
7236 | _("Tells gdb whether to execute forward or backward."), | |
7237 | set_exec_direction_func, show_exec_direction_func, | |
7238 | &setlist, &showlist); | |
7239 | ||
6c95b8df PA |
7240 | /* Set/show detach-on-fork: user-settable mode. */ |
7241 | ||
7242 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
7243 | Set whether gdb will detach the child of a fork."), _("\ | |
7244 | Show whether gdb will detach the child of a fork."), _("\ | |
7245 | Tells gdb whether to detach the child of a fork."), | |
7246 | NULL, NULL, &setlist, &showlist); | |
7247 | ||
03583c20 UW |
7248 | /* Set/show disable address space randomization mode. */ |
7249 | ||
7250 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
7251 | &disable_randomization, _("\ | |
7252 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
7253 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
7254 | When this mode is on (which is the default), randomization of the virtual\n\ | |
7255 | address space is disabled. Standalone programs run with the randomization\n\ | |
7256 | enabled by default on some platforms."), | |
7257 | &set_disable_randomization, | |
7258 | &show_disable_randomization, | |
7259 | &setlist, &showlist); | |
7260 | ||
ca6724c1 | 7261 | /* ptid initializations */ |
ca6724c1 KB |
7262 | inferior_ptid = null_ptid; |
7263 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd PA |
7264 | |
7265 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 7266 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 7267 | observer_attach_thread_exit (infrun_thread_thread_exit); |
fc1cf338 | 7268 | observer_attach_inferior_exit (infrun_inferior_exit); |
4aa995e1 PA |
7269 | |
7270 | /* Explicitly create without lookup, since that tries to create a | |
7271 | value with a void typed value, and when we get here, gdbarch | |
7272 | isn't initialized yet. At this point, we're quite sure there | |
7273 | isn't another convenience variable of the same name. */ | |
7274 | create_internalvar_type_lazy ("_siginfo", siginfo_make_value); | |
d914c394 SS |
7275 | |
7276 | add_setshow_boolean_cmd ("observer", no_class, | |
7277 | &observer_mode_1, _("\ | |
7278 | Set whether gdb controls the inferior in observer mode."), _("\ | |
7279 | Show whether gdb controls the inferior in observer mode."), _("\ | |
7280 | In observer mode, GDB can get data from the inferior, but not\n\ | |
7281 | affect its execution. Registers and memory may not be changed,\n\ | |
7282 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
7283 | or signalled."), | |
7284 | set_observer_mode, | |
7285 | show_observer_mode, | |
7286 | &setlist, | |
7287 | &showlist); | |
c906108c | 7288 | } |