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" |
28106bc2 SDJ |
58 | #include "probe.h" |
59 | #include "objfiles.h" | |
de0bea00 | 60 | #include "completer.h" |
9107fc8d | 61 | #include "target-descriptions.h" |
c906108c SS |
62 | |
63 | /* Prototypes for local functions */ | |
64 | ||
96baa820 | 65 | static void signals_info (char *, int); |
c906108c | 66 | |
96baa820 | 67 | static void handle_command (char *, int); |
c906108c | 68 | |
2ea28649 | 69 | static void sig_print_info (enum gdb_signal); |
c906108c | 70 | |
96baa820 | 71 | static void sig_print_header (void); |
c906108c | 72 | |
74b7792f | 73 | static void resume_cleanups (void *); |
c906108c | 74 | |
96baa820 | 75 | static int hook_stop_stub (void *); |
c906108c | 76 | |
96baa820 JM |
77 | static int restore_selected_frame (void *); |
78 | ||
4ef3f3be | 79 | static int follow_fork (void); |
96baa820 JM |
80 | |
81 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 82 | struct cmd_list_element *c); |
96baa820 | 83 | |
a289b8f6 JK |
84 | static int currently_stepping (struct thread_info *tp); |
85 | ||
b3444185 PA |
86 | static int currently_stepping_or_nexting_callback (struct thread_info *tp, |
87 | void *data); | |
a7212384 | 88 | |
96baa820 JM |
89 | static void xdb_handle_command (char *args, int from_tty); |
90 | ||
6a6b96b9 | 91 | static int prepare_to_proceed (int); |
ea67f13b | 92 | |
33d62d64 JK |
93 | static void print_exited_reason (int exitstatus); |
94 | ||
2ea28649 | 95 | static void print_signal_exited_reason (enum gdb_signal siggnal); |
33d62d64 JK |
96 | |
97 | static void print_no_history_reason (void); | |
98 | ||
2ea28649 | 99 | static void print_signal_received_reason (enum gdb_signal siggnal); |
33d62d64 JK |
100 | |
101 | static void print_end_stepping_range_reason (void); | |
102 | ||
96baa820 | 103 | void _initialize_infrun (void); |
43ff13b4 | 104 | |
e58b0e63 PA |
105 | void nullify_last_target_wait_ptid (void); |
106 | ||
2c03e5be | 107 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
108 | |
109 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
110 | ||
2484c66b UW |
111 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
112 | ||
5fbbeb29 CF |
113 | /* When set, stop the 'step' command if we enter a function which has |
114 | no line number information. The normal behavior is that we step | |
115 | over such function. */ | |
116 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
117 | static void |
118 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
119 | struct cmd_list_element *c, const char *value) | |
120 | { | |
121 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
122 | } | |
5fbbeb29 | 123 | |
1777feb0 | 124 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 125 | |
43ff13b4 JM |
126 | int sync_execution = 0; |
127 | ||
c906108c SS |
128 | /* wait_for_inferior and normal_stop use this to notify the user |
129 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
130 | running in. */ |
131 | ||
39f77062 | 132 | static ptid_t previous_inferior_ptid; |
7a292a7a | 133 | |
6c95b8df PA |
134 | /* Default behavior is to detach newly forked processes (legacy). */ |
135 | int detach_fork = 1; | |
136 | ||
237fc4c9 PA |
137 | int debug_displaced = 0; |
138 | static void | |
139 | show_debug_displaced (struct ui_file *file, int from_tty, | |
140 | struct cmd_list_element *c, const char *value) | |
141 | { | |
142 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
143 | } | |
144 | ||
ccce17b0 | 145 | unsigned int debug_infrun = 0; |
920d2a44 AC |
146 | static void |
147 | show_debug_infrun (struct ui_file *file, int from_tty, | |
148 | struct cmd_list_element *c, const char *value) | |
149 | { | |
150 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
151 | } | |
527159b7 | 152 | |
03583c20 UW |
153 | |
154 | /* Support for disabling address space randomization. */ | |
155 | ||
156 | int disable_randomization = 1; | |
157 | ||
158 | static void | |
159 | show_disable_randomization (struct ui_file *file, int from_tty, | |
160 | struct cmd_list_element *c, const char *value) | |
161 | { | |
162 | if (target_supports_disable_randomization ()) | |
163 | fprintf_filtered (file, | |
164 | _("Disabling randomization of debuggee's " | |
165 | "virtual address space is %s.\n"), | |
166 | value); | |
167 | else | |
168 | fputs_filtered (_("Disabling randomization of debuggee's " | |
169 | "virtual address space is unsupported on\n" | |
170 | "this platform.\n"), file); | |
171 | } | |
172 | ||
173 | static void | |
174 | set_disable_randomization (char *args, int from_tty, | |
175 | struct cmd_list_element *c) | |
176 | { | |
177 | if (!target_supports_disable_randomization ()) | |
178 | error (_("Disabling randomization of debuggee's " | |
179 | "virtual address space is unsupported on\n" | |
180 | "this platform.")); | |
181 | } | |
182 | ||
183 | ||
d4f3574e SS |
184 | /* If the program uses ELF-style shared libraries, then calls to |
185 | functions in shared libraries go through stubs, which live in a | |
186 | table called the PLT (Procedure Linkage Table). The first time the | |
187 | function is called, the stub sends control to the dynamic linker, | |
188 | which looks up the function's real address, patches the stub so | |
189 | that future calls will go directly to the function, and then passes | |
190 | control to the function. | |
191 | ||
192 | If we are stepping at the source level, we don't want to see any of | |
193 | this --- we just want to skip over the stub and the dynamic linker. | |
194 | The simple approach is to single-step until control leaves the | |
195 | dynamic linker. | |
196 | ||
ca557f44 AC |
197 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
198 | dynamic linker calls functions in the shared C library, so you | |
199 | can't tell from the PC alone whether the dynamic linker is still | |
200 | running. In this case, we use a step-resume breakpoint to get us | |
201 | past the dynamic linker, as if we were using "next" to step over a | |
202 | function call. | |
d4f3574e | 203 | |
cfd8ab24 | 204 | in_solib_dynsym_resolve_code() says whether we're in the dynamic |
d4f3574e SS |
205 | linker code or not. Normally, this means we single-step. However, |
206 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
207 | address where we can place a step-resume breakpoint to get past the | |
208 | linker's symbol resolution function. | |
209 | ||
cfd8ab24 | 210 | in_solib_dynsym_resolve_code() can generally be implemented in a |
d4f3574e SS |
211 | pretty portable way, by comparing the PC against the address ranges |
212 | of the dynamic linker's sections. | |
213 | ||
214 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
215 | it depends on internal details of the dynamic linker. It's usually | |
216 | not too hard to figure out where to put a breakpoint, but it | |
217 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
218 | sanity checking. If it can't figure things out, returning zero and | |
219 | getting the (possibly confusing) stepping behavior is better than | |
220 | signalling an error, which will obscure the change in the | |
221 | inferior's state. */ | |
c906108c | 222 | |
c906108c SS |
223 | /* This function returns TRUE if pc is the address of an instruction |
224 | that lies within the dynamic linker (such as the event hook, or the | |
225 | dld itself). | |
226 | ||
227 | This function must be used only when a dynamic linker event has | |
228 | been caught, and the inferior is being stepped out of the hook, or | |
229 | undefined results are guaranteed. */ | |
230 | ||
231 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
232 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
233 | #endif | |
234 | ||
d914c394 SS |
235 | /* "Observer mode" is somewhat like a more extreme version of |
236 | non-stop, in which all GDB operations that might affect the | |
237 | target's execution have been disabled. */ | |
238 | ||
239 | static int non_stop_1 = 0; | |
240 | ||
241 | int observer_mode = 0; | |
242 | static int observer_mode_1 = 0; | |
243 | ||
244 | static void | |
245 | set_observer_mode (char *args, int from_tty, | |
246 | struct cmd_list_element *c) | |
247 | { | |
248 | extern int pagination_enabled; | |
249 | ||
250 | if (target_has_execution) | |
251 | { | |
252 | observer_mode_1 = observer_mode; | |
253 | error (_("Cannot change this setting while the inferior is running.")); | |
254 | } | |
255 | ||
256 | observer_mode = observer_mode_1; | |
257 | ||
258 | may_write_registers = !observer_mode; | |
259 | may_write_memory = !observer_mode; | |
260 | may_insert_breakpoints = !observer_mode; | |
261 | may_insert_tracepoints = !observer_mode; | |
262 | /* We can insert fast tracepoints in or out of observer mode, | |
263 | but enable them if we're going into this mode. */ | |
264 | if (observer_mode) | |
265 | may_insert_fast_tracepoints = 1; | |
266 | may_stop = !observer_mode; | |
267 | update_target_permissions (); | |
268 | ||
269 | /* Going *into* observer mode we must force non-stop, then | |
270 | going out we leave it that way. */ | |
271 | if (observer_mode) | |
272 | { | |
273 | target_async_permitted = 1; | |
274 | pagination_enabled = 0; | |
275 | non_stop = non_stop_1 = 1; | |
276 | } | |
277 | ||
278 | if (from_tty) | |
279 | printf_filtered (_("Observer mode is now %s.\n"), | |
280 | (observer_mode ? "on" : "off")); | |
281 | } | |
282 | ||
283 | static void | |
284 | show_observer_mode (struct ui_file *file, int from_tty, | |
285 | struct cmd_list_element *c, const char *value) | |
286 | { | |
287 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
288 | } | |
289 | ||
290 | /* This updates the value of observer mode based on changes in | |
291 | permissions. Note that we are deliberately ignoring the values of | |
292 | may-write-registers and may-write-memory, since the user may have | |
293 | reason to enable these during a session, for instance to turn on a | |
294 | debugging-related global. */ | |
295 | ||
296 | void | |
297 | update_observer_mode (void) | |
298 | { | |
299 | int newval; | |
300 | ||
301 | newval = (!may_insert_breakpoints | |
302 | && !may_insert_tracepoints | |
303 | && may_insert_fast_tracepoints | |
304 | && !may_stop | |
305 | && non_stop); | |
306 | ||
307 | /* Let the user know if things change. */ | |
308 | if (newval != observer_mode) | |
309 | printf_filtered (_("Observer mode is now %s.\n"), | |
310 | (newval ? "on" : "off")); | |
311 | ||
312 | observer_mode = observer_mode_1 = newval; | |
313 | } | |
c2c6d25f | 314 | |
c906108c SS |
315 | /* Tables of how to react to signals; the user sets them. */ |
316 | ||
317 | static unsigned char *signal_stop; | |
318 | static unsigned char *signal_print; | |
319 | static unsigned char *signal_program; | |
320 | ||
2455069d UW |
321 | /* Table of signals that the target may silently handle. |
322 | This is automatically determined from the flags above, | |
323 | and simply cached here. */ | |
324 | static unsigned char *signal_pass; | |
325 | ||
c906108c SS |
326 | #define SET_SIGS(nsigs,sigs,flags) \ |
327 | do { \ | |
328 | int signum = (nsigs); \ | |
329 | while (signum-- > 0) \ | |
330 | if ((sigs)[signum]) \ | |
331 | (flags)[signum] = 1; \ | |
332 | } while (0) | |
333 | ||
334 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
335 | do { \ | |
336 | int signum = (nsigs); \ | |
337 | while (signum-- > 0) \ | |
338 | if ((sigs)[signum]) \ | |
339 | (flags)[signum] = 0; \ | |
340 | } while (0) | |
341 | ||
9b224c5e PA |
342 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
343 | this function is to avoid exporting `signal_program'. */ | |
344 | ||
345 | void | |
346 | update_signals_program_target (void) | |
347 | { | |
a493e3e2 | 348 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); |
9b224c5e PA |
349 | } |
350 | ||
1777feb0 | 351 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 352 | |
edb3359d | 353 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
354 | |
355 | /* Command list pointer for the "stop" placeholder. */ | |
356 | ||
357 | static struct cmd_list_element *stop_command; | |
358 | ||
c906108c SS |
359 | /* Function inferior was in as of last step command. */ |
360 | ||
361 | static struct symbol *step_start_function; | |
362 | ||
c906108c SS |
363 | /* Nonzero if we want to give control to the user when we're notified |
364 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 365 | int stop_on_solib_events; |
920d2a44 AC |
366 | static void |
367 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
368 | struct cmd_list_element *c, const char *value) | |
369 | { | |
370 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
371 | value); | |
372 | } | |
c906108c | 373 | |
c906108c SS |
374 | /* Nonzero means expecting a trace trap |
375 | and should stop the inferior and return silently when it happens. */ | |
376 | ||
377 | int stop_after_trap; | |
378 | ||
642fd101 DE |
379 | /* Save register contents here when executing a "finish" command or are |
380 | about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set. | |
c906108c SS |
381 | Thus this contains the return value from the called function (assuming |
382 | values are returned in a register). */ | |
383 | ||
72cec141 | 384 | struct regcache *stop_registers; |
c906108c | 385 | |
c906108c SS |
386 | /* Nonzero after stop if current stack frame should be printed. */ |
387 | ||
388 | static int stop_print_frame; | |
389 | ||
e02bc4cc | 390 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
391 | returned by target_wait()/deprecated_target_wait_hook(). This |
392 | information is returned by get_last_target_status(). */ | |
39f77062 | 393 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
394 | static struct target_waitstatus target_last_waitstatus; |
395 | ||
0d1e5fa7 PA |
396 | static void context_switch (ptid_t ptid); |
397 | ||
4e1c45ea | 398 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 PA |
399 | |
400 | void init_infwait_state (void); | |
a474d7c2 | 401 | |
53904c9e AC |
402 | static const char follow_fork_mode_child[] = "child"; |
403 | static const char follow_fork_mode_parent[] = "parent"; | |
404 | ||
40478521 | 405 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
406 | follow_fork_mode_child, |
407 | follow_fork_mode_parent, | |
408 | NULL | |
ef346e04 | 409 | }; |
c906108c | 410 | |
53904c9e | 411 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
412 | static void |
413 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
414 | struct cmd_list_element *c, const char *value) | |
415 | { | |
3e43a32a MS |
416 | fprintf_filtered (file, |
417 | _("Debugger response to a program " | |
418 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
419 | value); |
420 | } | |
c906108c SS |
421 | \f |
422 | ||
e58b0e63 PA |
423 | /* Tell the target to follow the fork we're stopped at. Returns true |
424 | if the inferior should be resumed; false, if the target for some | |
425 | reason decided it's best not to resume. */ | |
426 | ||
6604731b | 427 | static int |
4ef3f3be | 428 | follow_fork (void) |
c906108c | 429 | { |
ea1dd7bc | 430 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
431 | int should_resume = 1; |
432 | struct thread_info *tp; | |
433 | ||
434 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
435 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
436 | parent thread structure's run control related fields, not just these. |
437 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
438 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 439 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
440 | CORE_ADDR step_range_start = 0; |
441 | CORE_ADDR step_range_end = 0; | |
442 | struct frame_id step_frame_id = { 0 }; | |
e58b0e63 PA |
443 | |
444 | if (!non_stop) | |
445 | { | |
446 | ptid_t wait_ptid; | |
447 | struct target_waitstatus wait_status; | |
448 | ||
449 | /* Get the last target status returned by target_wait(). */ | |
450 | get_last_target_status (&wait_ptid, &wait_status); | |
451 | ||
452 | /* If not stopped at a fork event, then there's nothing else to | |
453 | do. */ | |
454 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
455 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
456 | return 1; | |
457 | ||
458 | /* Check if we switched over from WAIT_PTID, since the event was | |
459 | reported. */ | |
460 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
461 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
462 | { | |
463 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
464 | target to follow it (in either direction). We'll | |
465 | afterwards refuse to resume, and inform the user what | |
466 | happened. */ | |
467 | switch_to_thread (wait_ptid); | |
468 | should_resume = 0; | |
469 | } | |
470 | } | |
471 | ||
472 | tp = inferior_thread (); | |
473 | ||
474 | /* If there were any forks/vforks that were caught and are now to be | |
475 | followed, then do so now. */ | |
476 | switch (tp->pending_follow.kind) | |
477 | { | |
478 | case TARGET_WAITKIND_FORKED: | |
479 | case TARGET_WAITKIND_VFORKED: | |
480 | { | |
481 | ptid_t parent, child; | |
482 | ||
483 | /* If the user did a next/step, etc, over a fork call, | |
484 | preserve the stepping state in the fork child. */ | |
485 | if (follow_child && should_resume) | |
486 | { | |
8358c15c JK |
487 | step_resume_breakpoint = clone_momentary_breakpoint |
488 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
489 | step_range_start = tp->control.step_range_start; |
490 | step_range_end = tp->control.step_range_end; | |
491 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
492 | exception_resume_breakpoint |
493 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
e58b0e63 PA |
494 | |
495 | /* For now, delete the parent's sr breakpoint, otherwise, | |
496 | parent/child sr breakpoints are considered duplicates, | |
497 | and the child version will not be installed. Remove | |
498 | this when the breakpoints module becomes aware of | |
499 | inferiors and address spaces. */ | |
500 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
501 | tp->control.step_range_start = 0; |
502 | tp->control.step_range_end = 0; | |
503 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 504 | delete_exception_resume_breakpoint (tp); |
e58b0e63 PA |
505 | } |
506 | ||
507 | parent = inferior_ptid; | |
508 | child = tp->pending_follow.value.related_pid; | |
509 | ||
510 | /* Tell the target to do whatever is necessary to follow | |
511 | either parent or child. */ | |
512 | if (target_follow_fork (follow_child)) | |
513 | { | |
514 | /* Target refused to follow, or there's some other reason | |
515 | we shouldn't resume. */ | |
516 | should_resume = 0; | |
517 | } | |
518 | else | |
519 | { | |
520 | /* This pending follow fork event is now handled, one way | |
521 | or another. The previous selected thread may be gone | |
522 | from the lists by now, but if it is still around, need | |
523 | to clear the pending follow request. */ | |
e09875d4 | 524 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
525 | if (tp) |
526 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
527 | ||
528 | /* This makes sure we don't try to apply the "Switched | |
529 | over from WAIT_PID" logic above. */ | |
530 | nullify_last_target_wait_ptid (); | |
531 | ||
1777feb0 | 532 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
533 | if (follow_child) |
534 | { | |
535 | switch_to_thread (child); | |
536 | ||
537 | /* ... and preserve the stepping state, in case the | |
538 | user was stepping over the fork call. */ | |
539 | if (should_resume) | |
540 | { | |
541 | tp = inferior_thread (); | |
8358c15c JK |
542 | tp->control.step_resume_breakpoint |
543 | = step_resume_breakpoint; | |
16c381f0 JK |
544 | tp->control.step_range_start = step_range_start; |
545 | tp->control.step_range_end = step_range_end; | |
546 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
547 | tp->control.exception_resume_breakpoint |
548 | = exception_resume_breakpoint; | |
e58b0e63 PA |
549 | } |
550 | else | |
551 | { | |
552 | /* If we get here, it was because we're trying to | |
553 | resume from a fork catchpoint, but, the user | |
554 | has switched threads away from the thread that | |
555 | forked. In that case, the resume command | |
556 | issued is most likely not applicable to the | |
557 | child, so just warn, and refuse to resume. */ | |
3e43a32a MS |
558 | warning (_("Not resuming: switched threads " |
559 | "before following fork child.\n")); | |
e58b0e63 PA |
560 | } |
561 | ||
562 | /* Reset breakpoints in the child as appropriate. */ | |
563 | follow_inferior_reset_breakpoints (); | |
564 | } | |
565 | else | |
566 | switch_to_thread (parent); | |
567 | } | |
568 | } | |
569 | break; | |
570 | case TARGET_WAITKIND_SPURIOUS: | |
571 | /* Nothing to follow. */ | |
572 | break; | |
573 | default: | |
574 | internal_error (__FILE__, __LINE__, | |
575 | "Unexpected pending_follow.kind %d\n", | |
576 | tp->pending_follow.kind); | |
577 | break; | |
578 | } | |
c906108c | 579 | |
e58b0e63 | 580 | return should_resume; |
c906108c SS |
581 | } |
582 | ||
6604731b DJ |
583 | void |
584 | follow_inferior_reset_breakpoints (void) | |
c906108c | 585 | { |
4e1c45ea PA |
586 | struct thread_info *tp = inferior_thread (); |
587 | ||
6604731b DJ |
588 | /* Was there a step_resume breakpoint? (There was if the user |
589 | did a "next" at the fork() call.) If so, explicitly reset its | |
590 | thread number. | |
591 | ||
592 | step_resumes are a form of bp that are made to be per-thread. | |
593 | Since we created the step_resume bp when the parent process | |
594 | was being debugged, and now are switching to the child process, | |
595 | from the breakpoint package's viewpoint, that's a switch of | |
596 | "threads". We must update the bp's notion of which thread | |
597 | it is for, or it'll be ignored when it triggers. */ | |
598 | ||
8358c15c JK |
599 | if (tp->control.step_resume_breakpoint) |
600 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
6604731b | 601 | |
186c406b TT |
602 | if (tp->control.exception_resume_breakpoint) |
603 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
604 | ||
6604731b DJ |
605 | /* Reinsert all breakpoints in the child. The user may have set |
606 | breakpoints after catching the fork, in which case those | |
607 | were never set in the child, but only in the parent. This makes | |
608 | sure the inserted breakpoints match the breakpoint list. */ | |
609 | ||
610 | breakpoint_re_set (); | |
611 | insert_breakpoints (); | |
c906108c | 612 | } |
c906108c | 613 | |
6c95b8df PA |
614 | /* The child has exited or execed: resume threads of the parent the |
615 | user wanted to be executing. */ | |
616 | ||
617 | static int | |
618 | proceed_after_vfork_done (struct thread_info *thread, | |
619 | void *arg) | |
620 | { | |
621 | int pid = * (int *) arg; | |
622 | ||
623 | if (ptid_get_pid (thread->ptid) == pid | |
624 | && is_running (thread->ptid) | |
625 | && !is_executing (thread->ptid) | |
626 | && !thread->stop_requested | |
a493e3e2 | 627 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df PA |
628 | { |
629 | if (debug_infrun) | |
630 | fprintf_unfiltered (gdb_stdlog, | |
631 | "infrun: resuming vfork parent thread %s\n", | |
632 | target_pid_to_str (thread->ptid)); | |
633 | ||
634 | switch_to_thread (thread->ptid); | |
635 | clear_proceed_status (); | |
a493e3e2 | 636 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT, 0); |
6c95b8df PA |
637 | } |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
642 | /* Called whenever we notice an exec or exit event, to handle | |
643 | detaching or resuming a vfork parent. */ | |
644 | ||
645 | static void | |
646 | handle_vfork_child_exec_or_exit (int exec) | |
647 | { | |
648 | struct inferior *inf = current_inferior (); | |
649 | ||
650 | if (inf->vfork_parent) | |
651 | { | |
652 | int resume_parent = -1; | |
653 | ||
654 | /* This exec or exit marks the end of the shared memory region | |
655 | between the parent and the child. If the user wanted to | |
656 | detach from the parent, now is the time. */ | |
657 | ||
658 | if (inf->vfork_parent->pending_detach) | |
659 | { | |
660 | struct thread_info *tp; | |
661 | struct cleanup *old_chain; | |
662 | struct program_space *pspace; | |
663 | struct address_space *aspace; | |
664 | ||
1777feb0 | 665 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 666 | |
68c9da30 PA |
667 | inf->vfork_parent->pending_detach = 0; |
668 | ||
f50f4e56 PA |
669 | if (!exec) |
670 | { | |
671 | /* If we're handling a child exit, then inferior_ptid | |
672 | points at the inferior's pid, not to a thread. */ | |
673 | old_chain = save_inferior_ptid (); | |
674 | save_current_program_space (); | |
675 | save_current_inferior (); | |
676 | } | |
677 | else | |
678 | old_chain = save_current_space_and_thread (); | |
6c95b8df PA |
679 | |
680 | /* We're letting loose of the parent. */ | |
681 | tp = any_live_thread_of_process (inf->vfork_parent->pid); | |
682 | switch_to_thread (tp->ptid); | |
683 | ||
684 | /* We're about to detach from the parent, which implicitly | |
685 | removes breakpoints from its address space. There's a | |
686 | catch here: we want to reuse the spaces for the child, | |
687 | but, parent/child are still sharing the pspace at this | |
688 | point, although the exec in reality makes the kernel give | |
689 | the child a fresh set of new pages. The problem here is | |
690 | that the breakpoints module being unaware of this, would | |
691 | likely chose the child process to write to the parent | |
692 | address space. Swapping the child temporarily away from | |
693 | the spaces has the desired effect. Yes, this is "sort | |
694 | of" a hack. */ | |
695 | ||
696 | pspace = inf->pspace; | |
697 | aspace = inf->aspace; | |
698 | inf->aspace = NULL; | |
699 | inf->pspace = NULL; | |
700 | ||
701 | if (debug_infrun || info_verbose) | |
702 | { | |
703 | target_terminal_ours (); | |
704 | ||
705 | if (exec) | |
706 | fprintf_filtered (gdb_stdlog, | |
3e43a32a MS |
707 | "Detaching vfork parent process " |
708 | "%d after child exec.\n", | |
6c95b8df PA |
709 | inf->vfork_parent->pid); |
710 | else | |
711 | fprintf_filtered (gdb_stdlog, | |
3e43a32a MS |
712 | "Detaching vfork parent process " |
713 | "%d after child exit.\n", | |
6c95b8df PA |
714 | inf->vfork_parent->pid); |
715 | } | |
716 | ||
717 | target_detach (NULL, 0); | |
718 | ||
719 | /* Put it back. */ | |
720 | inf->pspace = pspace; | |
721 | inf->aspace = aspace; | |
722 | ||
723 | do_cleanups (old_chain); | |
724 | } | |
725 | else if (exec) | |
726 | { | |
727 | /* We're staying attached to the parent, so, really give the | |
728 | child a new address space. */ | |
729 | inf->pspace = add_program_space (maybe_new_address_space ()); | |
730 | inf->aspace = inf->pspace->aspace; | |
731 | inf->removable = 1; | |
732 | set_current_program_space (inf->pspace); | |
733 | ||
734 | resume_parent = inf->vfork_parent->pid; | |
735 | ||
736 | /* Break the bonds. */ | |
737 | inf->vfork_parent->vfork_child = NULL; | |
738 | } | |
739 | else | |
740 | { | |
741 | struct cleanup *old_chain; | |
742 | struct program_space *pspace; | |
743 | ||
744 | /* If this is a vfork child exiting, then the pspace and | |
745 | aspaces were shared with the parent. Since we're | |
746 | reporting the process exit, we'll be mourning all that is | |
747 | found in the address space, and switching to null_ptid, | |
748 | preparing to start a new inferior. But, since we don't | |
749 | want to clobber the parent's address/program spaces, we | |
750 | go ahead and create a new one for this exiting | |
751 | inferior. */ | |
752 | ||
753 | /* Switch to null_ptid, so that clone_program_space doesn't want | |
754 | to read the selected frame of a dead process. */ | |
755 | old_chain = save_inferior_ptid (); | |
756 | inferior_ptid = null_ptid; | |
757 | ||
758 | /* This inferior is dead, so avoid giving the breakpoints | |
759 | module the option to write through to it (cloning a | |
760 | program space resets breakpoints). */ | |
761 | inf->aspace = NULL; | |
762 | inf->pspace = NULL; | |
763 | pspace = add_program_space (maybe_new_address_space ()); | |
764 | set_current_program_space (pspace); | |
765 | inf->removable = 1; | |
7dcd53a0 | 766 | inf->symfile_flags = SYMFILE_NO_READ; |
6c95b8df PA |
767 | clone_program_space (pspace, inf->vfork_parent->pspace); |
768 | inf->pspace = pspace; | |
769 | inf->aspace = pspace->aspace; | |
770 | ||
771 | /* Put back inferior_ptid. We'll continue mourning this | |
1777feb0 | 772 | inferior. */ |
6c95b8df PA |
773 | do_cleanups (old_chain); |
774 | ||
775 | resume_parent = inf->vfork_parent->pid; | |
776 | /* Break the bonds. */ | |
777 | inf->vfork_parent->vfork_child = NULL; | |
778 | } | |
779 | ||
780 | inf->vfork_parent = NULL; | |
781 | ||
782 | gdb_assert (current_program_space == inf->pspace); | |
783 | ||
784 | if (non_stop && resume_parent != -1) | |
785 | { | |
786 | /* If the user wanted the parent to be running, let it go | |
787 | free now. */ | |
788 | struct cleanup *old_chain = make_cleanup_restore_current_thread (); | |
789 | ||
790 | if (debug_infrun) | |
3e43a32a MS |
791 | fprintf_unfiltered (gdb_stdlog, |
792 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
793 | resume_parent); |
794 | ||
795 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
796 | ||
797 | do_cleanups (old_chain); | |
798 | } | |
799 | } | |
800 | } | |
801 | ||
802 | /* Enum strings for "set|show displaced-stepping". */ | |
803 | ||
804 | static const char follow_exec_mode_new[] = "new"; | |
805 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 806 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
807 | { |
808 | follow_exec_mode_new, | |
809 | follow_exec_mode_same, | |
810 | NULL, | |
811 | }; | |
812 | ||
813 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
814 | static void | |
815 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
816 | struct cmd_list_element *c, const char *value) | |
817 | { | |
818 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
819 | } | |
820 | ||
1777feb0 | 821 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
1adeb98a | 822 | |
c906108c | 823 | static void |
3a3e9ee3 | 824 | follow_exec (ptid_t pid, char *execd_pathname) |
c906108c | 825 | { |
4e1c45ea | 826 | struct thread_info *th = inferior_thread (); |
6c95b8df | 827 | struct inferior *inf = current_inferior (); |
7a292a7a | 828 | |
c906108c SS |
829 | /* This is an exec event that we actually wish to pay attention to. |
830 | Refresh our symbol table to the newly exec'd program, remove any | |
831 | momentary bp's, etc. | |
832 | ||
833 | If there are breakpoints, they aren't really inserted now, | |
834 | since the exec() transformed our inferior into a fresh set | |
835 | of instructions. | |
836 | ||
837 | We want to preserve symbolic breakpoints on the list, since | |
838 | we have hopes that they can be reset after the new a.out's | |
839 | symbol table is read. | |
840 | ||
841 | However, any "raw" breakpoints must be removed from the list | |
842 | (e.g., the solib bp's), since their address is probably invalid | |
843 | now. | |
844 | ||
845 | And, we DON'T want to call delete_breakpoints() here, since | |
846 | that may write the bp's "shadow contents" (the instruction | |
847 | value that was overwritten witha TRAP instruction). Since | |
1777feb0 | 848 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
849 | |
850 | mark_breakpoints_out (); | |
851 | ||
c906108c SS |
852 | update_breakpoints_after_exec (); |
853 | ||
854 | /* If there was one, it's gone now. We cannot truly step-to-next | |
1777feb0 | 855 | statement through an exec(). */ |
8358c15c | 856 | th->control.step_resume_breakpoint = NULL; |
186c406b | 857 | th->control.exception_resume_breakpoint = NULL; |
16c381f0 JK |
858 | th->control.step_range_start = 0; |
859 | th->control.step_range_end = 0; | |
c906108c | 860 | |
a75724bc PA |
861 | /* The target reports the exec event to the main thread, even if |
862 | some other thread does the exec, and even if the main thread was | |
863 | already stopped --- if debugging in non-stop mode, it's possible | |
864 | the user had the main thread held stopped in the previous image | |
865 | --- release it now. This is the same behavior as step-over-exec | |
866 | with scheduler-locking on in all-stop mode. */ | |
867 | th->stop_requested = 0; | |
868 | ||
1777feb0 | 869 | /* What is this a.out's name? */ |
6c95b8df PA |
870 | printf_unfiltered (_("%s is executing new program: %s\n"), |
871 | target_pid_to_str (inferior_ptid), | |
872 | execd_pathname); | |
c906108c SS |
873 | |
874 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 875 | inferior has essentially been killed & reborn. */ |
7a292a7a | 876 | |
c906108c | 877 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
878 | |
879 | breakpoint_init_inferior (inf_execd); | |
e85a822c DJ |
880 | |
881 | if (gdb_sysroot && *gdb_sysroot) | |
882 | { | |
883 | char *name = alloca (strlen (gdb_sysroot) | |
884 | + strlen (execd_pathname) | |
885 | + 1); | |
abbb1732 | 886 | |
e85a822c DJ |
887 | strcpy (name, gdb_sysroot); |
888 | strcat (name, execd_pathname); | |
889 | execd_pathname = name; | |
890 | } | |
c906108c | 891 | |
cce9b6bf PA |
892 | /* Reset the shared library package. This ensures that we get a |
893 | shlib event when the child reaches "_start", at which point the | |
894 | dld will have had a chance to initialize the child. */ | |
895 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
896 | we don't want those to be satisfied by the libraries of the | |
897 | previous incarnation of this process. */ | |
898 | no_shared_libraries (NULL, 0); | |
899 | ||
6c95b8df PA |
900 | if (follow_exec_mode_string == follow_exec_mode_new) |
901 | { | |
902 | struct program_space *pspace; | |
6c95b8df PA |
903 | |
904 | /* The user wants to keep the old inferior and program spaces | |
905 | around. Create a new fresh one, and switch to it. */ | |
906 | ||
907 | inf = add_inferior (current_inferior ()->pid); | |
908 | pspace = add_program_space (maybe_new_address_space ()); | |
909 | inf->pspace = pspace; | |
910 | inf->aspace = pspace->aspace; | |
911 | ||
912 | exit_inferior_num_silent (current_inferior ()->num); | |
913 | ||
914 | set_current_inferior (inf); | |
915 | set_current_program_space (pspace); | |
916 | } | |
9107fc8d PA |
917 | else |
918 | { | |
919 | /* The old description may no longer be fit for the new image. | |
920 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
921 | old description; we'll read a new one below. No need to do | |
922 | this on "follow-exec-mode new", as the old inferior stays | |
923 | around (its description is later cleared/refetched on | |
924 | restart). */ | |
925 | target_clear_description (); | |
926 | } | |
6c95b8df PA |
927 | |
928 | gdb_assert (current_program_space == inf->pspace); | |
929 | ||
1777feb0 | 930 | /* That a.out is now the one to use. */ |
6c95b8df PA |
931 | exec_file_attach (execd_pathname, 0); |
932 | ||
c1e56572 JK |
933 | /* SYMFILE_DEFER_BP_RESET is used as the proper displacement for PIE |
934 | (Position Independent Executable) main symbol file will get applied by | |
935 | solib_create_inferior_hook below. breakpoint_re_set would fail to insert | |
936 | the breakpoints with the zero displacement. */ | |
937 | ||
7dcd53a0 TT |
938 | symbol_file_add (execd_pathname, |
939 | (inf->symfile_flags | |
940 | | SYMFILE_MAINLINE | SYMFILE_DEFER_BP_RESET), | |
c1e56572 JK |
941 | NULL, 0); |
942 | ||
7dcd53a0 TT |
943 | if ((inf->symfile_flags & SYMFILE_NO_READ) == 0) |
944 | set_initial_language (); | |
c906108c | 945 | |
9107fc8d PA |
946 | /* If the target can specify a description, read it. Must do this |
947 | after flipping to the new executable (because the target supplied | |
948 | description must be compatible with the executable's | |
949 | architecture, and the old executable may e.g., be 32-bit, while | |
950 | the new one 64-bit), and before anything involving memory or | |
951 | registers. */ | |
952 | target_find_description (); | |
953 | ||
7a292a7a | 954 | #ifdef SOLIB_CREATE_INFERIOR_HOOK |
39f77062 | 955 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
a77053c2 | 956 | #else |
268a4a75 | 957 | solib_create_inferior_hook (0); |
7a292a7a | 958 | #endif |
c906108c | 959 | |
4efc6507 DE |
960 | jit_inferior_created_hook (); |
961 | ||
c1e56572 JK |
962 | breakpoint_re_set (); |
963 | ||
c906108c SS |
964 | /* Reinsert all breakpoints. (Those which were symbolic have |
965 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 966 | to symbol_file_command...). */ |
c906108c SS |
967 | insert_breakpoints (); |
968 | ||
969 | /* The next resume of this inferior should bring it to the shlib | |
970 | startup breakpoints. (If the user had also set bp's on | |
971 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 972 | matically get reset there in the new process.). */ |
c906108c SS |
973 | } |
974 | ||
975 | /* Non-zero if we just simulating a single-step. This is needed | |
976 | because we cannot remove the breakpoints in the inferior process | |
977 | until after the `wait' in `wait_for_inferior'. */ | |
978 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
979 | |
980 | /* The thread we inserted single-step breakpoints for. */ | |
981 | static ptid_t singlestep_ptid; | |
982 | ||
fd48f117 DJ |
983 | /* PC when we started this single-step. */ |
984 | static CORE_ADDR singlestep_pc; | |
985 | ||
9f976b41 DJ |
986 | /* If another thread hit the singlestep breakpoint, we save the original |
987 | thread here so that we can resume single-stepping it later. */ | |
988 | static ptid_t saved_singlestep_ptid; | |
989 | static int stepping_past_singlestep_breakpoint; | |
6a6b96b9 | 990 | |
ca67fcb8 VP |
991 | /* If not equal to null_ptid, this means that after stepping over breakpoint |
992 | is finished, we need to switch to deferred_step_ptid, and step it. | |
993 | ||
994 | The use case is when one thread has hit a breakpoint, and then the user | |
1777feb0 | 995 | has switched to another thread and issued 'step'. We need to step over |
ca67fcb8 VP |
996 | breakpoint in the thread which hit the breakpoint, but then continue |
997 | stepping the thread user has selected. */ | |
998 | static ptid_t deferred_step_ptid; | |
c906108c | 999 | \f |
237fc4c9 PA |
1000 | /* Displaced stepping. */ |
1001 | ||
1002 | /* In non-stop debugging mode, we must take special care to manage | |
1003 | breakpoints properly; in particular, the traditional strategy for | |
1004 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1005 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1006 | breakpoint it has hit while ensuring that other threads running | |
1007 | concurrently will hit the breakpoint as they should. | |
1008 | ||
1009 | The traditional way to step a thread T off a breakpoint in a | |
1010 | multi-threaded program in all-stop mode is as follows: | |
1011 | ||
1012 | a0) Initially, all threads are stopped, and breakpoints are not | |
1013 | inserted. | |
1014 | a1) We single-step T, leaving breakpoints uninserted. | |
1015 | a2) We insert breakpoints, and resume all threads. | |
1016 | ||
1017 | In non-stop debugging, however, this strategy is unsuitable: we | |
1018 | don't want to have to stop all threads in the system in order to | |
1019 | continue or step T past a breakpoint. Instead, we use displaced | |
1020 | stepping: | |
1021 | ||
1022 | n0) Initially, T is stopped, other threads are running, and | |
1023 | breakpoints are inserted. | |
1024 | n1) We copy the instruction "under" the breakpoint to a separate | |
1025 | location, outside the main code stream, making any adjustments | |
1026 | to the instruction, register, and memory state as directed by | |
1027 | T's architecture. | |
1028 | n2) We single-step T over the instruction at its new location. | |
1029 | n3) We adjust the resulting register and memory state as directed | |
1030 | by T's architecture. This includes resetting T's PC to point | |
1031 | back into the main instruction stream. | |
1032 | n4) We resume T. | |
1033 | ||
1034 | This approach depends on the following gdbarch methods: | |
1035 | ||
1036 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1037 | indicate where to copy the instruction, and how much space must | |
1038 | be reserved there. We use these in step n1. | |
1039 | ||
1040 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1041 | address, and makes any necessary adjustments to the instruction, | |
1042 | register contents, and memory. We use this in step n1. | |
1043 | ||
1044 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
1045 | we have successfuly single-stepped the instruction, to yield the | |
1046 | same effect the instruction would have had if we had executed it | |
1047 | at its original address. We use this in step n3. | |
1048 | ||
1049 | - gdbarch_displaced_step_free_closure provides cleanup. | |
1050 | ||
1051 | The gdbarch_displaced_step_copy_insn and | |
1052 | gdbarch_displaced_step_fixup functions must be written so that | |
1053 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1054 | single-stepping across the copied instruction, and then applying | |
1055 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1056 | thread's memory and registers as stepping the instruction in place | |
1057 | would have. Exactly which responsibilities fall to the copy and | |
1058 | which fall to the fixup is up to the author of those functions. | |
1059 | ||
1060 | See the comments in gdbarch.sh for details. | |
1061 | ||
1062 | Note that displaced stepping and software single-step cannot | |
1063 | currently be used in combination, although with some care I think | |
1064 | they could be made to. Software single-step works by placing | |
1065 | breakpoints on all possible subsequent instructions; if the | |
1066 | displaced instruction is a PC-relative jump, those breakpoints | |
1067 | could fall in very strange places --- on pages that aren't | |
1068 | executable, or at addresses that are not proper instruction | |
1069 | boundaries. (We do generally let other threads run while we wait | |
1070 | to hit the software single-step breakpoint, and they might | |
1071 | encounter such a corrupted instruction.) One way to work around | |
1072 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1073 | simulate the effect of PC-relative instructions (and return NULL) | |
1074 | on architectures that use software single-stepping. | |
1075 | ||
1076 | In non-stop mode, we can have independent and simultaneous step | |
1077 | requests, so more than one thread may need to simultaneously step | |
1078 | over a breakpoint. The current implementation assumes there is | |
1079 | only one scratch space per process. In this case, we have to | |
1080 | serialize access to the scratch space. If thread A wants to step | |
1081 | over a breakpoint, but we are currently waiting for some other | |
1082 | thread to complete a displaced step, we leave thread A stopped and | |
1083 | place it in the displaced_step_request_queue. Whenever a displaced | |
1084 | step finishes, we pick the next thread in the queue and start a new | |
1085 | displaced step operation on it. See displaced_step_prepare and | |
1086 | displaced_step_fixup for details. */ | |
1087 | ||
237fc4c9 PA |
1088 | struct displaced_step_request |
1089 | { | |
1090 | ptid_t ptid; | |
1091 | struct displaced_step_request *next; | |
1092 | }; | |
1093 | ||
fc1cf338 PA |
1094 | /* Per-inferior displaced stepping state. */ |
1095 | struct displaced_step_inferior_state | |
1096 | { | |
1097 | /* Pointer to next in linked list. */ | |
1098 | struct displaced_step_inferior_state *next; | |
1099 | ||
1100 | /* The process this displaced step state refers to. */ | |
1101 | int pid; | |
1102 | ||
1103 | /* A queue of pending displaced stepping requests. One entry per | |
1104 | thread that needs to do a displaced step. */ | |
1105 | struct displaced_step_request *step_request_queue; | |
1106 | ||
1107 | /* If this is not null_ptid, this is the thread carrying out a | |
1108 | displaced single-step in process PID. This thread's state will | |
1109 | require fixing up once it has completed its step. */ | |
1110 | ptid_t step_ptid; | |
1111 | ||
1112 | /* The architecture the thread had when we stepped it. */ | |
1113 | struct gdbarch *step_gdbarch; | |
1114 | ||
1115 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
1116 | for post-step cleanup. */ | |
1117 | struct displaced_step_closure *step_closure; | |
1118 | ||
1119 | /* The address of the original instruction, and the copy we | |
1120 | made. */ | |
1121 | CORE_ADDR step_original, step_copy; | |
1122 | ||
1123 | /* Saved contents of copy area. */ | |
1124 | gdb_byte *step_saved_copy; | |
1125 | }; | |
1126 | ||
1127 | /* The list of states of processes involved in displaced stepping | |
1128 | presently. */ | |
1129 | static struct displaced_step_inferior_state *displaced_step_inferior_states; | |
1130 | ||
1131 | /* Get the displaced stepping state of process PID. */ | |
1132 | ||
1133 | static struct displaced_step_inferior_state * | |
1134 | get_displaced_stepping_state (int pid) | |
1135 | { | |
1136 | struct displaced_step_inferior_state *state; | |
1137 | ||
1138 | for (state = displaced_step_inferior_states; | |
1139 | state != NULL; | |
1140 | state = state->next) | |
1141 | if (state->pid == pid) | |
1142 | return state; | |
1143 | ||
1144 | return NULL; | |
1145 | } | |
1146 | ||
1147 | /* Add a new displaced stepping state for process PID to the displaced | |
1148 | stepping state list, or return a pointer to an already existing | |
1149 | entry, if it already exists. Never returns NULL. */ | |
1150 | ||
1151 | static struct displaced_step_inferior_state * | |
1152 | add_displaced_stepping_state (int pid) | |
1153 | { | |
1154 | struct displaced_step_inferior_state *state; | |
1155 | ||
1156 | for (state = displaced_step_inferior_states; | |
1157 | state != NULL; | |
1158 | state = state->next) | |
1159 | if (state->pid == pid) | |
1160 | return state; | |
237fc4c9 | 1161 | |
fc1cf338 PA |
1162 | state = xcalloc (1, sizeof (*state)); |
1163 | state->pid = pid; | |
1164 | state->next = displaced_step_inferior_states; | |
1165 | displaced_step_inferior_states = state; | |
237fc4c9 | 1166 | |
fc1cf338 PA |
1167 | return state; |
1168 | } | |
1169 | ||
a42244db YQ |
1170 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1171 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1172 | return NULL. */ | |
1173 | ||
1174 | struct displaced_step_closure* | |
1175 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1176 | { | |
1177 | struct displaced_step_inferior_state *displaced | |
1178 | = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); | |
1179 | ||
1180 | /* If checking the mode of displaced instruction in copy area. */ | |
1181 | if (displaced && !ptid_equal (displaced->step_ptid, null_ptid) | |
1182 | && (displaced->step_copy == addr)) | |
1183 | return displaced->step_closure; | |
1184 | ||
1185 | return NULL; | |
1186 | } | |
1187 | ||
fc1cf338 | 1188 | /* Remove the displaced stepping state of process PID. */ |
237fc4c9 | 1189 | |
fc1cf338 PA |
1190 | static void |
1191 | remove_displaced_stepping_state (int pid) | |
1192 | { | |
1193 | struct displaced_step_inferior_state *it, **prev_next_p; | |
237fc4c9 | 1194 | |
fc1cf338 PA |
1195 | gdb_assert (pid != 0); |
1196 | ||
1197 | it = displaced_step_inferior_states; | |
1198 | prev_next_p = &displaced_step_inferior_states; | |
1199 | while (it) | |
1200 | { | |
1201 | if (it->pid == pid) | |
1202 | { | |
1203 | *prev_next_p = it->next; | |
1204 | xfree (it); | |
1205 | return; | |
1206 | } | |
1207 | ||
1208 | prev_next_p = &it->next; | |
1209 | it = *prev_next_p; | |
1210 | } | |
1211 | } | |
1212 | ||
1213 | static void | |
1214 | infrun_inferior_exit (struct inferior *inf) | |
1215 | { | |
1216 | remove_displaced_stepping_state (inf->pid); | |
1217 | } | |
237fc4c9 | 1218 | |
fff08868 HZ |
1219 | /* If ON, and the architecture supports it, GDB will use displaced |
1220 | stepping to step over breakpoints. If OFF, or if the architecture | |
1221 | doesn't support it, GDB will instead use the traditional | |
1222 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1223 | decide which technique to use to step over breakpoints depending on | |
1224 | which of all-stop or non-stop mode is active --- displaced stepping | |
1225 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1226 | ||
72d0e2c5 | 1227 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1228 | |
237fc4c9 PA |
1229 | static void |
1230 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1231 | struct cmd_list_element *c, | |
1232 | const char *value) | |
1233 | { | |
72d0e2c5 | 1234 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1235 | fprintf_filtered (file, |
1236 | _("Debugger's willingness to use displaced stepping " | |
1237 | "to step over breakpoints is %s (currently %s).\n"), | |
fff08868 HZ |
1238 | value, non_stop ? "on" : "off"); |
1239 | else | |
3e43a32a MS |
1240 | fprintf_filtered (file, |
1241 | _("Debugger's willingness to use displaced stepping " | |
1242 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1243 | } |
1244 | ||
fff08868 HZ |
1245 | /* Return non-zero if displaced stepping can/should be used to step |
1246 | over breakpoints. */ | |
1247 | ||
237fc4c9 PA |
1248 | static int |
1249 | use_displaced_stepping (struct gdbarch *gdbarch) | |
1250 | { | |
72d0e2c5 YQ |
1251 | return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO && non_stop) |
1252 | || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
96429cc8 HZ |
1253 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
1254 | && !RECORD_IS_USED); | |
237fc4c9 PA |
1255 | } |
1256 | ||
1257 | /* Clean out any stray displaced stepping state. */ | |
1258 | static void | |
fc1cf338 | 1259 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1260 | { |
1261 | /* Indicate that there is no cleanup pending. */ | |
fc1cf338 | 1262 | displaced->step_ptid = null_ptid; |
237fc4c9 | 1263 | |
fc1cf338 | 1264 | if (displaced->step_closure) |
237fc4c9 | 1265 | { |
fc1cf338 PA |
1266 | gdbarch_displaced_step_free_closure (displaced->step_gdbarch, |
1267 | displaced->step_closure); | |
1268 | displaced->step_closure = NULL; | |
237fc4c9 PA |
1269 | } |
1270 | } | |
1271 | ||
1272 | static void | |
fc1cf338 | 1273 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1274 | { |
fc1cf338 PA |
1275 | struct displaced_step_inferior_state *state = arg; |
1276 | ||
1277 | displaced_step_clear (state); | |
237fc4c9 PA |
1278 | } |
1279 | ||
1280 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1281 | void | |
1282 | displaced_step_dump_bytes (struct ui_file *file, | |
1283 | const gdb_byte *buf, | |
1284 | size_t len) | |
1285 | { | |
1286 | int i; | |
1287 | ||
1288 | for (i = 0; i < len; i++) | |
1289 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1290 | fputs_unfiltered ("\n", file); | |
1291 | } | |
1292 | ||
1293 | /* Prepare to single-step, using displaced stepping. | |
1294 | ||
1295 | Note that we cannot use displaced stepping when we have a signal to | |
1296 | deliver. If we have a signal to deliver and an instruction to step | |
1297 | over, then after the step, there will be no indication from the | |
1298 | target whether the thread entered a signal handler or ignored the | |
1299 | signal and stepped over the instruction successfully --- both cases | |
1300 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1301 | fixup, and in the second case we must --- but we can't tell which. | |
1302 | Comments in the code for 'random signals' in handle_inferior_event | |
1303 | explain how we handle this case instead. | |
1304 | ||
1305 | Returns 1 if preparing was successful -- this thread is going to be | |
1306 | stepped now; or 0 if displaced stepping this thread got queued. */ | |
1307 | static int | |
1308 | displaced_step_prepare (ptid_t ptid) | |
1309 | { | |
ad53cd71 | 1310 | struct cleanup *old_cleanups, *ignore_cleanups; |
237fc4c9 PA |
1311 | struct regcache *regcache = get_thread_regcache (ptid); |
1312 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1313 | CORE_ADDR original, copy; | |
1314 | ULONGEST len; | |
1315 | struct displaced_step_closure *closure; | |
fc1cf338 | 1316 | struct displaced_step_inferior_state *displaced; |
9e529e1d | 1317 | int status; |
237fc4c9 PA |
1318 | |
1319 | /* We should never reach this function if the architecture does not | |
1320 | support displaced stepping. */ | |
1321 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1322 | ||
fc1cf338 PA |
1323 | /* We have to displaced step one thread at a time, as we only have |
1324 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1325 | |
fc1cf338 PA |
1326 | displaced = add_displaced_stepping_state (ptid_get_pid (ptid)); |
1327 | ||
1328 | if (!ptid_equal (displaced->step_ptid, null_ptid)) | |
237fc4c9 PA |
1329 | { |
1330 | /* Already waiting for a displaced step to finish. Defer this | |
1331 | request and place in queue. */ | |
1332 | struct displaced_step_request *req, *new_req; | |
1333 | ||
1334 | if (debug_displaced) | |
1335 | fprintf_unfiltered (gdb_stdlog, | |
1336 | "displaced: defering step of %s\n", | |
1337 | target_pid_to_str (ptid)); | |
1338 | ||
1339 | new_req = xmalloc (sizeof (*new_req)); | |
1340 | new_req->ptid = ptid; | |
1341 | new_req->next = NULL; | |
1342 | ||
fc1cf338 | 1343 | if (displaced->step_request_queue) |
237fc4c9 | 1344 | { |
fc1cf338 | 1345 | for (req = displaced->step_request_queue; |
237fc4c9 PA |
1346 | req && req->next; |
1347 | req = req->next) | |
1348 | ; | |
1349 | req->next = new_req; | |
1350 | } | |
1351 | else | |
fc1cf338 | 1352 | displaced->step_request_queue = new_req; |
237fc4c9 PA |
1353 | |
1354 | return 0; | |
1355 | } | |
1356 | else | |
1357 | { | |
1358 | if (debug_displaced) | |
1359 | fprintf_unfiltered (gdb_stdlog, | |
1360 | "displaced: stepping %s now\n", | |
1361 | target_pid_to_str (ptid)); | |
1362 | } | |
1363 | ||
fc1cf338 | 1364 | displaced_step_clear (displaced); |
237fc4c9 | 1365 | |
ad53cd71 PA |
1366 | old_cleanups = save_inferior_ptid (); |
1367 | inferior_ptid = ptid; | |
1368 | ||
515630c5 | 1369 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1370 | |
1371 | copy = gdbarch_displaced_step_location (gdbarch); | |
1372 | len = gdbarch_max_insn_length (gdbarch); | |
1373 | ||
1374 | /* Save the original contents of the copy area. */ | |
fc1cf338 | 1375 | displaced->step_saved_copy = xmalloc (len); |
ad53cd71 | 1376 | ignore_cleanups = make_cleanup (free_current_contents, |
fc1cf338 | 1377 | &displaced->step_saved_copy); |
9e529e1d JK |
1378 | status = target_read_memory (copy, displaced->step_saved_copy, len); |
1379 | if (status != 0) | |
1380 | throw_error (MEMORY_ERROR, | |
1381 | _("Error accessing memory address %s (%s) for " | |
1382 | "displaced-stepping scratch space."), | |
1383 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1384 | if (debug_displaced) |
1385 | { | |
5af949e3 UW |
1386 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1387 | paddress (gdbarch, copy)); | |
fc1cf338 PA |
1388 | displaced_step_dump_bytes (gdb_stdlog, |
1389 | displaced->step_saved_copy, | |
1390 | len); | |
237fc4c9 PA |
1391 | }; |
1392 | ||
1393 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1394 | original, copy, regcache); |
237fc4c9 PA |
1395 | |
1396 | /* We don't support the fully-simulated case at present. */ | |
1397 | gdb_assert (closure); | |
1398 | ||
9f5a595d UW |
1399 | /* Save the information we need to fix things up if the step |
1400 | succeeds. */ | |
fc1cf338 PA |
1401 | displaced->step_ptid = ptid; |
1402 | displaced->step_gdbarch = gdbarch; | |
1403 | displaced->step_closure = closure; | |
1404 | displaced->step_original = original; | |
1405 | displaced->step_copy = copy; | |
9f5a595d | 1406 | |
fc1cf338 | 1407 | make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1408 | |
1409 | /* Resume execution at the copy. */ | |
515630c5 | 1410 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1411 | |
ad53cd71 PA |
1412 | discard_cleanups (ignore_cleanups); |
1413 | ||
1414 | do_cleanups (old_cleanups); | |
237fc4c9 PA |
1415 | |
1416 | if (debug_displaced) | |
5af949e3 UW |
1417 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1418 | paddress (gdbarch, copy)); | |
237fc4c9 | 1419 | |
237fc4c9 PA |
1420 | return 1; |
1421 | } | |
1422 | ||
237fc4c9 | 1423 | static void |
3e43a32a MS |
1424 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1425 | const gdb_byte *myaddr, int len) | |
237fc4c9 PA |
1426 | { |
1427 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
abbb1732 | 1428 | |
237fc4c9 PA |
1429 | inferior_ptid = ptid; |
1430 | write_memory (memaddr, myaddr, len); | |
1431 | do_cleanups (ptid_cleanup); | |
1432 | } | |
1433 | ||
e2d96639 YQ |
1434 | /* Restore the contents of the copy area for thread PTID. */ |
1435 | ||
1436 | static void | |
1437 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1438 | ptid_t ptid) | |
1439 | { | |
1440 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1441 | ||
1442 | write_memory_ptid (ptid, displaced->step_copy, | |
1443 | displaced->step_saved_copy, len); | |
1444 | if (debug_displaced) | |
1445 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
1446 | target_pid_to_str (ptid), | |
1447 | paddress (displaced->step_gdbarch, | |
1448 | displaced->step_copy)); | |
1449 | } | |
1450 | ||
237fc4c9 | 1451 | static void |
2ea28649 | 1452 | displaced_step_fixup (ptid_t event_ptid, enum gdb_signal signal) |
237fc4c9 PA |
1453 | { |
1454 | struct cleanup *old_cleanups; | |
fc1cf338 PA |
1455 | struct displaced_step_inferior_state *displaced |
1456 | = get_displaced_stepping_state (ptid_get_pid (event_ptid)); | |
1457 | ||
1458 | /* Was any thread of this process doing a displaced step? */ | |
1459 | if (displaced == NULL) | |
1460 | return; | |
237fc4c9 PA |
1461 | |
1462 | /* Was this event for the pid we displaced? */ | |
fc1cf338 PA |
1463 | if (ptid_equal (displaced->step_ptid, null_ptid) |
1464 | || ! ptid_equal (displaced->step_ptid, event_ptid)) | |
237fc4c9 PA |
1465 | return; |
1466 | ||
fc1cf338 | 1467 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 | 1468 | |
e2d96639 | 1469 | displaced_step_restore (displaced, displaced->step_ptid); |
237fc4c9 PA |
1470 | |
1471 | /* Did the instruction complete successfully? */ | |
a493e3e2 | 1472 | if (signal == GDB_SIGNAL_TRAP) |
237fc4c9 PA |
1473 | { |
1474 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
1475 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
1476 | displaced->step_closure, | |
1477 | displaced->step_original, | |
1478 | displaced->step_copy, | |
1479 | get_thread_regcache (displaced->step_ptid)); | |
237fc4c9 PA |
1480 | } |
1481 | else | |
1482 | { | |
1483 | /* Since the instruction didn't complete, all we can do is | |
1484 | relocate the PC. */ | |
515630c5 UW |
1485 | struct regcache *regcache = get_thread_regcache (event_ptid); |
1486 | CORE_ADDR pc = regcache_read_pc (regcache); | |
abbb1732 | 1487 | |
fc1cf338 | 1488 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1489 | regcache_write_pc (regcache, pc); |
237fc4c9 PA |
1490 | } |
1491 | ||
1492 | do_cleanups (old_cleanups); | |
1493 | ||
fc1cf338 | 1494 | displaced->step_ptid = null_ptid; |
1c5cfe86 | 1495 | |
237fc4c9 | 1496 | /* Are there any pending displaced stepping requests? If so, run |
fc1cf338 PA |
1497 | one now. Leave the state object around, since we're likely to |
1498 | need it again soon. */ | |
1499 | while (displaced->step_request_queue) | |
237fc4c9 PA |
1500 | { |
1501 | struct displaced_step_request *head; | |
1502 | ptid_t ptid; | |
5af949e3 | 1503 | struct regcache *regcache; |
929dfd4f | 1504 | struct gdbarch *gdbarch; |
1c5cfe86 | 1505 | CORE_ADDR actual_pc; |
6c95b8df | 1506 | struct address_space *aspace; |
237fc4c9 | 1507 | |
fc1cf338 | 1508 | head = displaced->step_request_queue; |
237fc4c9 | 1509 | ptid = head->ptid; |
fc1cf338 | 1510 | displaced->step_request_queue = head->next; |
237fc4c9 PA |
1511 | xfree (head); |
1512 | ||
ad53cd71 PA |
1513 | context_switch (ptid); |
1514 | ||
5af949e3 UW |
1515 | regcache = get_thread_regcache (ptid); |
1516 | actual_pc = regcache_read_pc (regcache); | |
6c95b8df | 1517 | aspace = get_regcache_aspace (regcache); |
1c5cfe86 | 1518 | |
6c95b8df | 1519 | if (breakpoint_here_p (aspace, actual_pc)) |
ad53cd71 | 1520 | { |
1c5cfe86 PA |
1521 | if (debug_displaced) |
1522 | fprintf_unfiltered (gdb_stdlog, | |
1523 | "displaced: stepping queued %s now\n", | |
1524 | target_pid_to_str (ptid)); | |
1525 | ||
1526 | displaced_step_prepare (ptid); | |
1527 | ||
929dfd4f JB |
1528 | gdbarch = get_regcache_arch (regcache); |
1529 | ||
1c5cfe86 PA |
1530 | if (debug_displaced) |
1531 | { | |
929dfd4f | 1532 | CORE_ADDR actual_pc = regcache_read_pc (regcache); |
1c5cfe86 PA |
1533 | gdb_byte buf[4]; |
1534 | ||
5af949e3 UW |
1535 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", |
1536 | paddress (gdbarch, actual_pc)); | |
1c5cfe86 PA |
1537 | read_memory (actual_pc, buf, sizeof (buf)); |
1538 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1539 | } | |
1540 | ||
fc1cf338 PA |
1541 | if (gdbarch_displaced_step_hw_singlestep (gdbarch, |
1542 | displaced->step_closure)) | |
a493e3e2 | 1543 | target_resume (ptid, 1, GDB_SIGNAL_0); |
99e40580 | 1544 | else |
a493e3e2 | 1545 | target_resume (ptid, 0, GDB_SIGNAL_0); |
1c5cfe86 PA |
1546 | |
1547 | /* Done, we're stepping a thread. */ | |
1548 | break; | |
ad53cd71 | 1549 | } |
1c5cfe86 PA |
1550 | else |
1551 | { | |
1552 | int step; | |
1553 | struct thread_info *tp = inferior_thread (); | |
1554 | ||
1555 | /* The breakpoint we were sitting under has since been | |
1556 | removed. */ | |
16c381f0 | 1557 | tp->control.trap_expected = 0; |
1c5cfe86 PA |
1558 | |
1559 | /* Go back to what we were trying to do. */ | |
1560 | step = currently_stepping (tp); | |
ad53cd71 | 1561 | |
1c5cfe86 | 1562 | if (debug_displaced) |
3e43a32a | 1563 | fprintf_unfiltered (gdb_stdlog, |
27d2932e | 1564 | "displaced: breakpoint is gone: %s, step(%d)\n", |
1c5cfe86 PA |
1565 | target_pid_to_str (tp->ptid), step); |
1566 | ||
a493e3e2 PA |
1567 | target_resume (ptid, step, GDB_SIGNAL_0); |
1568 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
1c5cfe86 PA |
1569 | |
1570 | /* This request was discarded. See if there's any other | |
1571 | thread waiting for its turn. */ | |
1572 | } | |
237fc4c9 PA |
1573 | } |
1574 | } | |
1575 | ||
5231c1fd PA |
1576 | /* Update global variables holding ptids to hold NEW_PTID if they were |
1577 | holding OLD_PTID. */ | |
1578 | static void | |
1579 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
1580 | { | |
1581 | struct displaced_step_request *it; | |
fc1cf338 | 1582 | struct displaced_step_inferior_state *displaced; |
5231c1fd PA |
1583 | |
1584 | if (ptid_equal (inferior_ptid, old_ptid)) | |
1585 | inferior_ptid = new_ptid; | |
1586 | ||
1587 | if (ptid_equal (singlestep_ptid, old_ptid)) | |
1588 | singlestep_ptid = new_ptid; | |
1589 | ||
5231c1fd PA |
1590 | if (ptid_equal (deferred_step_ptid, old_ptid)) |
1591 | deferred_step_ptid = new_ptid; | |
1592 | ||
fc1cf338 PA |
1593 | for (displaced = displaced_step_inferior_states; |
1594 | displaced; | |
1595 | displaced = displaced->next) | |
1596 | { | |
1597 | if (ptid_equal (displaced->step_ptid, old_ptid)) | |
1598 | displaced->step_ptid = new_ptid; | |
1599 | ||
1600 | for (it = displaced->step_request_queue; it; it = it->next) | |
1601 | if (ptid_equal (it->ptid, old_ptid)) | |
1602 | it->ptid = new_ptid; | |
1603 | } | |
5231c1fd PA |
1604 | } |
1605 | ||
237fc4c9 PA |
1606 | \f |
1607 | /* Resuming. */ | |
c906108c SS |
1608 | |
1609 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 1610 | static void |
74b7792f | 1611 | resume_cleanups (void *ignore) |
c906108c SS |
1612 | { |
1613 | normal_stop (); | |
1614 | } | |
1615 | ||
53904c9e AC |
1616 | static const char schedlock_off[] = "off"; |
1617 | static const char schedlock_on[] = "on"; | |
1618 | static const char schedlock_step[] = "step"; | |
40478521 | 1619 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
1620 | schedlock_off, |
1621 | schedlock_on, | |
1622 | schedlock_step, | |
1623 | NULL | |
1624 | }; | |
920d2a44 AC |
1625 | static const char *scheduler_mode = schedlock_off; |
1626 | static void | |
1627 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
1628 | struct cmd_list_element *c, const char *value) | |
1629 | { | |
3e43a32a MS |
1630 | fprintf_filtered (file, |
1631 | _("Mode for locking scheduler " | |
1632 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
1633 | value); |
1634 | } | |
c906108c SS |
1635 | |
1636 | static void | |
96baa820 | 1637 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 1638 | { |
eefe576e AC |
1639 | if (!target_can_lock_scheduler) |
1640 | { | |
1641 | scheduler_mode = schedlock_off; | |
1642 | error (_("Target '%s' cannot support this command."), target_shortname); | |
1643 | } | |
c906108c SS |
1644 | } |
1645 | ||
d4db2f36 PA |
1646 | /* True if execution commands resume all threads of all processes by |
1647 | default; otherwise, resume only threads of the current inferior | |
1648 | process. */ | |
1649 | int sched_multi = 0; | |
1650 | ||
2facfe5c DD |
1651 | /* Try to setup for software single stepping over the specified location. |
1652 | Return 1 if target_resume() should use hardware single step. | |
1653 | ||
1654 | GDBARCH the current gdbarch. | |
1655 | PC the location to step over. */ | |
1656 | ||
1657 | static int | |
1658 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1659 | { | |
1660 | int hw_step = 1; | |
1661 | ||
f02253f1 HZ |
1662 | if (execution_direction == EXEC_FORWARD |
1663 | && gdbarch_software_single_step_p (gdbarch) | |
99e40580 | 1664 | && gdbarch_software_single_step (gdbarch, get_current_frame ())) |
2facfe5c | 1665 | { |
99e40580 UW |
1666 | hw_step = 0; |
1667 | /* Do not pull these breakpoints until after a `wait' in | |
1777feb0 | 1668 | `wait_for_inferior'. */ |
99e40580 UW |
1669 | singlestep_breakpoints_inserted_p = 1; |
1670 | singlestep_ptid = inferior_ptid; | |
1671 | singlestep_pc = pc; | |
2facfe5c DD |
1672 | } |
1673 | return hw_step; | |
1674 | } | |
c906108c | 1675 | |
09cee04b PA |
1676 | /* Return a ptid representing the set of threads that we will proceed, |
1677 | in the perspective of the user/frontend. We may actually resume | |
1678 | fewer threads at first, e.g., if a thread is stopped at a | |
b136cd05 PA |
1679 | breakpoint that needs stepping-off, but that should not be visible |
1680 | to the user/frontend, and neither should the frontend/user be | |
1681 | allowed to proceed any of the threads that happen to be stopped for | |
09cee04b PA |
1682 | internal run control handling, if a previous command wanted them |
1683 | resumed. */ | |
1684 | ||
1685 | ptid_t | |
1686 | user_visible_resume_ptid (int step) | |
1687 | { | |
1688 | /* By default, resume all threads of all processes. */ | |
1689 | ptid_t resume_ptid = RESUME_ALL; | |
1690 | ||
1691 | /* Maybe resume only all threads of the current process. */ | |
1692 | if (!sched_multi && target_supports_multi_process ()) | |
1693 | { | |
1694 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
1695 | } | |
1696 | ||
1697 | /* Maybe resume a single thread after all. */ | |
1698 | if (non_stop) | |
1699 | { | |
1700 | /* With non-stop mode on, threads are always handled | |
1701 | individually. */ | |
1702 | resume_ptid = inferior_ptid; | |
1703 | } | |
1704 | else if ((scheduler_mode == schedlock_on) | |
1705 | || (scheduler_mode == schedlock_step | |
1706 | && (step || singlestep_breakpoints_inserted_p))) | |
1707 | { | |
1708 | /* User-settable 'scheduler' mode requires solo thread resume. */ | |
1709 | resume_ptid = inferior_ptid; | |
1710 | } | |
1711 | ||
1712 | return resume_ptid; | |
1713 | } | |
1714 | ||
c906108c SS |
1715 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
1716 | wants to interrupt some lengthy single-stepping operation | |
1717 | (for child processes, the SIGINT goes to the inferior, and so | |
1718 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
1719 | other targets, that's not true). | |
1720 | ||
1721 | STEP nonzero if we should step (zero to continue instead). | |
1722 | SIG is the signal to give the inferior (zero for none). */ | |
1723 | void | |
2ea28649 | 1724 | resume (int step, enum gdb_signal sig) |
c906108c SS |
1725 | { |
1726 | int should_resume = 1; | |
74b7792f | 1727 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
1728 | struct regcache *regcache = get_current_regcache (); |
1729 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4e1c45ea | 1730 | struct thread_info *tp = inferior_thread (); |
515630c5 | 1731 | CORE_ADDR pc = regcache_read_pc (regcache); |
6c95b8df | 1732 | struct address_space *aspace = get_regcache_aspace (regcache); |
c7e8a53c | 1733 | |
c906108c SS |
1734 | QUIT; |
1735 | ||
74609e71 YQ |
1736 | if (current_inferior ()->waiting_for_vfork_done) |
1737 | { | |
48f9886d PA |
1738 | /* Don't try to single-step a vfork parent that is waiting for |
1739 | the child to get out of the shared memory region (by exec'ing | |
1740 | or exiting). This is particularly important on software | |
1741 | single-step archs, as the child process would trip on the | |
1742 | software single step breakpoint inserted for the parent | |
1743 | process. Since the parent will not actually execute any | |
1744 | instruction until the child is out of the shared region (such | |
1745 | are vfork's semantics), it is safe to simply continue it. | |
1746 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
1747 | the parent, and tell it to `keep_going', which automatically | |
1748 | re-sets it stepping. */ | |
74609e71 YQ |
1749 | if (debug_infrun) |
1750 | fprintf_unfiltered (gdb_stdlog, | |
1751 | "infrun: resume : clear step\n"); | |
1752 | step = 0; | |
1753 | } | |
1754 | ||
527159b7 | 1755 | if (debug_infrun) |
237fc4c9 PA |
1756 | fprintf_unfiltered (gdb_stdlog, |
1757 | "infrun: resume (step=%d, signal=%d), " | |
0d9a9a5f PA |
1758 | "trap_expected=%d, current thread [%s] at %s\n", |
1759 | step, sig, tp->control.trap_expected, | |
1760 | target_pid_to_str (inferior_ptid), | |
1761 | paddress (gdbarch, pc)); | |
c906108c | 1762 | |
c2c6d25f JM |
1763 | /* Normally, by the time we reach `resume', the breakpoints are either |
1764 | removed or inserted, as appropriate. The exception is if we're sitting | |
1765 | at a permanent breakpoint; we need to step over it, but permanent | |
1766 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 1767 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 1768 | { |
515630c5 UW |
1769 | if (gdbarch_skip_permanent_breakpoint_p (gdbarch)) |
1770 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
6d350bb5 | 1771 | else |
ac74f770 MS |
1772 | error (_("\ |
1773 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
1774 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
1775 | a command like `return' or `jump' to continue execution.")); | |
6d350bb5 | 1776 | } |
c2c6d25f | 1777 | |
237fc4c9 PA |
1778 | /* If enabled, step over breakpoints by executing a copy of the |
1779 | instruction at a different address. | |
1780 | ||
1781 | We can't use displaced stepping when we have a signal to deliver; | |
1782 | the comments for displaced_step_prepare explain why. The | |
1783 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
1784 | signals' explain what we do instead. |
1785 | ||
1786 | We can't use displaced stepping when we are waiting for vfork_done | |
1787 | event, displaced stepping breaks the vfork child similarly as single | |
1788 | step software breakpoint. */ | |
515630c5 | 1789 | if (use_displaced_stepping (gdbarch) |
16c381f0 | 1790 | && (tp->control.trap_expected |
929dfd4f | 1791 | || (step && gdbarch_software_single_step_p (gdbarch))) |
a493e3e2 | 1792 | && sig == GDB_SIGNAL_0 |
74609e71 | 1793 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 1794 | { |
fc1cf338 PA |
1795 | struct displaced_step_inferior_state *displaced; |
1796 | ||
237fc4c9 | 1797 | if (!displaced_step_prepare (inferior_ptid)) |
d56b7306 VP |
1798 | { |
1799 | /* Got placed in displaced stepping queue. Will be resumed | |
1800 | later when all the currently queued displaced stepping | |
7f7efbd9 VP |
1801 | requests finish. The thread is not executing at this point, |
1802 | and the call to set_executing will be made later. But we | |
1803 | need to call set_running here, since from frontend point of view, | |
1804 | the thread is running. */ | |
1805 | set_running (inferior_ptid, 1); | |
d56b7306 VP |
1806 | discard_cleanups (old_cleanups); |
1807 | return; | |
1808 | } | |
99e40580 | 1809 | |
ca7781d2 LM |
1810 | /* Update pc to reflect the new address from which we will execute |
1811 | instructions due to displaced stepping. */ | |
1812 | pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); | |
1813 | ||
fc1cf338 PA |
1814 | displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); |
1815 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, | |
1816 | displaced->step_closure); | |
237fc4c9 PA |
1817 | } |
1818 | ||
2facfe5c | 1819 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 1820 | else if (step) |
2facfe5c | 1821 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 1822 | |
30852783 UW |
1823 | /* Currently, our software single-step implementation leads to different |
1824 | results than hardware single-stepping in one situation: when stepping | |
1825 | into delivering a signal which has an associated signal handler, | |
1826 | hardware single-step will stop at the first instruction of the handler, | |
1827 | while software single-step will simply skip execution of the handler. | |
1828 | ||
1829 | For now, this difference in behavior is accepted since there is no | |
1830 | easy way to actually implement single-stepping into a signal handler | |
1831 | without kernel support. | |
1832 | ||
1833 | However, there is one scenario where this difference leads to follow-on | |
1834 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
1835 | and then single-stepping. In this case, the software single-step | |
1836 | behavior means that even if there is a *breakpoint* in the signal | |
1837 | handler, GDB still would not stop. | |
1838 | ||
1839 | Fortunately, we can at least fix this particular issue. We detect | |
1840 | here the case where we are about to deliver a signal while software | |
1841 | single-stepping with breakpoints removed. In this situation, we | |
1842 | revert the decisions to remove all breakpoints and insert single- | |
1843 | step breakpoints, and instead we install a step-resume breakpoint | |
1844 | at the current address, deliver the signal without stepping, and | |
1845 | once we arrive back at the step-resume breakpoint, actually step | |
1846 | over the breakpoint we originally wanted to step over. */ | |
1847 | if (singlestep_breakpoints_inserted_p | |
a493e3e2 | 1848 | && tp->control.trap_expected && sig != GDB_SIGNAL_0) |
30852783 UW |
1849 | { |
1850 | /* If we have nested signals or a pending signal is delivered | |
1851 | immediately after a handler returns, might might already have | |
1852 | a step-resume breakpoint set on the earlier handler. We cannot | |
1853 | set another step-resume breakpoint; just continue on until the | |
1854 | original breakpoint is hit. */ | |
1855 | if (tp->control.step_resume_breakpoint == NULL) | |
1856 | { | |
2c03e5be | 1857 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
1858 | tp->step_after_step_resume_breakpoint = 1; |
1859 | } | |
1860 | ||
1861 | remove_single_step_breakpoints (); | |
1862 | singlestep_breakpoints_inserted_p = 0; | |
1863 | ||
1864 | insert_breakpoints (); | |
1865 | tp->control.trap_expected = 0; | |
1866 | } | |
1867 | ||
c906108c SS |
1868 | if (should_resume) |
1869 | { | |
39f77062 | 1870 | ptid_t resume_ptid; |
dfcd3bfb | 1871 | |
cd76b0b7 VP |
1872 | /* If STEP is set, it's a request to use hardware stepping |
1873 | facilities. But in that case, we should never | |
1874 | use singlestep breakpoint. */ | |
1875 | gdb_assert (!(singlestep_breakpoints_inserted_p && step)); | |
1876 | ||
d4db2f36 PA |
1877 | /* Decide the set of threads to ask the target to resume. Start |
1878 | by assuming everything will be resumed, than narrow the set | |
1879 | by applying increasingly restricting conditions. */ | |
09cee04b | 1880 | resume_ptid = user_visible_resume_ptid (step); |
d4db2f36 PA |
1881 | |
1882 | /* Maybe resume a single thread after all. */ | |
cd76b0b7 VP |
1883 | if (singlestep_breakpoints_inserted_p |
1884 | && stepping_past_singlestep_breakpoint) | |
c906108c | 1885 | { |
cd76b0b7 VP |
1886 | /* The situation here is as follows. In thread T1 we wanted to |
1887 | single-step. Lacking hardware single-stepping we've | |
1888 | set breakpoint at the PC of the next instruction -- call it | |
1889 | P. After resuming, we've hit that breakpoint in thread T2. | |
1890 | Now we've removed original breakpoint, inserted breakpoint | |
1891 | at P+1, and try to step to advance T2 past breakpoint. | |
1892 | We need to step only T2, as if T1 is allowed to freely run, | |
1893 | it can run past P, and if other threads are allowed to run, | |
1894 | they can hit breakpoint at P+1, and nested hits of single-step | |
1895 | breakpoints is not something we'd want -- that's complicated | |
1896 | to support, and has no value. */ | |
1897 | resume_ptid = inferior_ptid; | |
1898 | } | |
d4db2f36 | 1899 | else if ((step || singlestep_breakpoints_inserted_p) |
16c381f0 | 1900 | && tp->control.trap_expected) |
cd76b0b7 | 1901 | { |
74960c60 VP |
1902 | /* We're allowing a thread to run past a breakpoint it has |
1903 | hit, by single-stepping the thread with the breakpoint | |
1904 | removed. In which case, we need to single-step only this | |
1905 | thread, and keep others stopped, as they can miss this | |
1906 | breakpoint if allowed to run. | |
1907 | ||
1908 | The current code actually removes all breakpoints when | |
1909 | doing this, not just the one being stepped over, so if we | |
1910 | let other threads run, we can actually miss any | |
1911 | breakpoint, not just the one at PC. */ | |
ef5cf84e | 1912 | resume_ptid = inferior_ptid; |
c906108c | 1913 | } |
ef5cf84e | 1914 | |
515630c5 | 1915 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4ed33b9 AC |
1916 | { |
1917 | /* Most targets can step a breakpoint instruction, thus | |
1918 | executing it normally. But if this one cannot, just | |
1919 | continue and we will hit it anyway. */ | |
6c95b8df | 1920 | if (step && breakpoint_inserted_here_p (aspace, pc)) |
c4ed33b9 AC |
1921 | step = 0; |
1922 | } | |
237fc4c9 PA |
1923 | |
1924 | if (debug_displaced | |
515630c5 | 1925 | && use_displaced_stepping (gdbarch) |
16c381f0 | 1926 | && tp->control.trap_expected) |
237fc4c9 | 1927 | { |
515630c5 | 1928 | struct regcache *resume_regcache = get_thread_regcache (resume_ptid); |
5af949e3 | 1929 | struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache); |
515630c5 | 1930 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
237fc4c9 PA |
1931 | gdb_byte buf[4]; |
1932 | ||
5af949e3 UW |
1933 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", |
1934 | paddress (resume_gdbarch, actual_pc)); | |
237fc4c9 PA |
1935 | read_memory (actual_pc, buf, sizeof (buf)); |
1936 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1937 | } | |
1938 | ||
e58b0e63 PA |
1939 | /* Install inferior's terminal modes. */ |
1940 | target_terminal_inferior (); | |
1941 | ||
2020b7ab PA |
1942 | /* Avoid confusing the next resume, if the next stop/resume |
1943 | happens to apply to another thread. */ | |
a493e3e2 | 1944 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
607cecd2 | 1945 | |
2455069d UW |
1946 | /* Advise target which signals may be handled silently. If we have |
1947 | removed breakpoints because we are stepping over one (which can | |
1948 | happen only if we are not using displaced stepping), we need to | |
1949 | receive all signals to avoid accidentally skipping a breakpoint | |
1950 | during execution of a signal handler. */ | |
1951 | if ((step || singlestep_breakpoints_inserted_p) | |
1952 | && tp->control.trap_expected | |
1953 | && !use_displaced_stepping (gdbarch)) | |
1954 | target_pass_signals (0, NULL); | |
1955 | else | |
a493e3e2 | 1956 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); |
2455069d | 1957 | |
607cecd2 | 1958 | target_resume (resume_ptid, step, sig); |
c906108c SS |
1959 | } |
1960 | ||
1961 | discard_cleanups (old_cleanups); | |
1962 | } | |
1963 | \f | |
237fc4c9 | 1964 | /* Proceeding. */ |
c906108c SS |
1965 | |
1966 | /* Clear out all variables saying what to do when inferior is continued. | |
1967 | First do this, then set the ones you want, then call `proceed'. */ | |
1968 | ||
a7212384 UW |
1969 | static void |
1970 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 1971 | { |
a7212384 UW |
1972 | if (debug_infrun) |
1973 | fprintf_unfiltered (gdb_stdlog, | |
1974 | "infrun: clear_proceed_status_thread (%s)\n", | |
1975 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 1976 | |
16c381f0 JK |
1977 | tp->control.trap_expected = 0; |
1978 | tp->control.step_range_start = 0; | |
1979 | tp->control.step_range_end = 0; | |
1980 | tp->control.step_frame_id = null_frame_id; | |
1981 | tp->control.step_stack_frame_id = null_frame_id; | |
1982 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
a7212384 | 1983 | tp->stop_requested = 0; |
4e1c45ea | 1984 | |
16c381f0 | 1985 | tp->control.stop_step = 0; |
32400beb | 1986 | |
16c381f0 | 1987 | tp->control.proceed_to_finish = 0; |
414c69f7 | 1988 | |
a7212384 | 1989 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 1990 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 1991 | } |
32400beb | 1992 | |
a7212384 UW |
1993 | static int |
1994 | clear_proceed_status_callback (struct thread_info *tp, void *data) | |
1995 | { | |
1996 | if (is_exited (tp->ptid)) | |
1997 | return 0; | |
d6b48e9c | 1998 | |
a7212384 UW |
1999 | clear_proceed_status_thread (tp); |
2000 | return 0; | |
2001 | } | |
2002 | ||
2003 | void | |
2004 | clear_proceed_status (void) | |
2005 | { | |
6c95b8df PA |
2006 | if (!non_stop) |
2007 | { | |
2008 | /* In all-stop mode, delete the per-thread status of all | |
2009 | threads, even if inferior_ptid is null_ptid, there may be | |
2010 | threads on the list. E.g., we may be launching a new | |
2011 | process, while selecting the executable. */ | |
2012 | iterate_over_threads (clear_proceed_status_callback, NULL); | |
2013 | } | |
2014 | ||
a7212384 UW |
2015 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2016 | { | |
2017 | struct inferior *inferior; | |
2018 | ||
2019 | if (non_stop) | |
2020 | { | |
6c95b8df PA |
2021 | /* If in non-stop mode, only delete the per-thread status of |
2022 | the current thread. */ | |
a7212384 UW |
2023 | clear_proceed_status_thread (inferior_thread ()); |
2024 | } | |
6c95b8df | 2025 | |
d6b48e9c | 2026 | inferior = current_inferior (); |
16c381f0 | 2027 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2028 | } |
2029 | ||
c906108c | 2030 | stop_after_trap = 0; |
f3b1572e PA |
2031 | |
2032 | observer_notify_about_to_proceed (); | |
c906108c | 2033 | |
d5c31457 UW |
2034 | if (stop_registers) |
2035 | { | |
2036 | regcache_xfree (stop_registers); | |
2037 | stop_registers = NULL; | |
2038 | } | |
c906108c SS |
2039 | } |
2040 | ||
5a437975 DE |
2041 | /* Check the current thread against the thread that reported the most recent |
2042 | event. If a step-over is required return TRUE and set the current thread | |
2043 | to the old thread. Otherwise return FALSE. | |
2044 | ||
1777feb0 | 2045 | This should be suitable for any targets that support threads. */ |
ea67f13b DJ |
2046 | |
2047 | static int | |
6a6b96b9 | 2048 | prepare_to_proceed (int step) |
ea67f13b DJ |
2049 | { |
2050 | ptid_t wait_ptid; | |
2051 | struct target_waitstatus wait_status; | |
5a437975 DE |
2052 | int schedlock_enabled; |
2053 | ||
2054 | /* With non-stop mode on, threads are always handled individually. */ | |
2055 | gdb_assert (! non_stop); | |
ea67f13b DJ |
2056 | |
2057 | /* Get the last target status returned by target_wait(). */ | |
2058 | get_last_target_status (&wait_ptid, &wait_status); | |
2059 | ||
6a6b96b9 | 2060 | /* Make sure we were stopped at a breakpoint. */ |
ea67f13b | 2061 | if (wait_status.kind != TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
2062 | || (wait_status.value.sig != GDB_SIGNAL_TRAP |
2063 | && wait_status.value.sig != GDB_SIGNAL_ILL | |
2064 | && wait_status.value.sig != GDB_SIGNAL_SEGV | |
2065 | && wait_status.value.sig != GDB_SIGNAL_EMT)) | |
ea67f13b DJ |
2066 | { |
2067 | return 0; | |
2068 | } | |
2069 | ||
5a437975 DE |
2070 | schedlock_enabled = (scheduler_mode == schedlock_on |
2071 | || (scheduler_mode == schedlock_step | |
2072 | && step)); | |
2073 | ||
d4db2f36 PA |
2074 | /* Don't switch over to WAIT_PTID if scheduler locking is on. */ |
2075 | if (schedlock_enabled) | |
2076 | return 0; | |
2077 | ||
2078 | /* Don't switch over if we're about to resume some other process | |
2079 | other than WAIT_PTID's, and schedule-multiple is off. */ | |
2080 | if (!sched_multi | |
2081 | && ptid_get_pid (wait_ptid) != ptid_get_pid (inferior_ptid)) | |
2082 | return 0; | |
2083 | ||
6a6b96b9 | 2084 | /* Switched over from WAIT_PID. */ |
ea67f13b | 2085 | if (!ptid_equal (wait_ptid, minus_one_ptid) |
d4db2f36 | 2086 | && !ptid_equal (inferior_ptid, wait_ptid)) |
ea67f13b | 2087 | { |
515630c5 UW |
2088 | struct regcache *regcache = get_thread_regcache (wait_ptid); |
2089 | ||
6c95b8df PA |
2090 | if (breakpoint_here_p (get_regcache_aspace (regcache), |
2091 | regcache_read_pc (regcache))) | |
ea67f13b | 2092 | { |
515630c5 UW |
2093 | /* If stepping, remember current thread to switch back to. */ |
2094 | if (step) | |
2095 | deferred_step_ptid = inferior_ptid; | |
ea67f13b | 2096 | |
515630c5 UW |
2097 | /* Switch back to WAIT_PID thread. */ |
2098 | switch_to_thread (wait_ptid); | |
6a6b96b9 | 2099 | |
0d9a9a5f PA |
2100 | if (debug_infrun) |
2101 | fprintf_unfiltered (gdb_stdlog, | |
2102 | "infrun: prepare_to_proceed (step=%d), " | |
2103 | "switched to [%s]\n", | |
2104 | step, target_pid_to_str (inferior_ptid)); | |
2105 | ||
515630c5 UW |
2106 | /* We return 1 to indicate that there is a breakpoint here, |
2107 | so we need to step over it before continuing to avoid | |
1777feb0 | 2108 | hitting it straight away. */ |
515630c5 UW |
2109 | return 1; |
2110 | } | |
ea67f13b DJ |
2111 | } |
2112 | ||
2113 | return 0; | |
ea67f13b | 2114 | } |
e4846b08 | 2115 | |
c906108c SS |
2116 | /* Basic routine for continuing the program in various fashions. |
2117 | ||
2118 | ADDR is the address to resume at, or -1 for resume where stopped. | |
2119 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 2120 | or -1 for act according to how it stopped. |
c906108c | 2121 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
2122 | -1 means return after that and print nothing. |
2123 | You should probably set various step_... variables | |
2124 | before calling here, if you are stepping. | |
c906108c SS |
2125 | |
2126 | You should call clear_proceed_status before calling proceed. */ | |
2127 | ||
2128 | void | |
2ea28649 | 2129 | proceed (CORE_ADDR addr, enum gdb_signal siggnal, int step) |
c906108c | 2130 | { |
e58b0e63 PA |
2131 | struct regcache *regcache; |
2132 | struct gdbarch *gdbarch; | |
4e1c45ea | 2133 | struct thread_info *tp; |
e58b0e63 | 2134 | CORE_ADDR pc; |
6c95b8df | 2135 | struct address_space *aspace; |
c906108c SS |
2136 | int oneproc = 0; |
2137 | ||
e58b0e63 PA |
2138 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2139 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2140 | resuming the current thread. */ | |
2141 | if (!follow_fork ()) | |
2142 | { | |
2143 | /* The target for some reason decided not to resume. */ | |
2144 | normal_stop (); | |
f148b27e PA |
2145 | if (target_can_async_p ()) |
2146 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2147 | return; |
2148 | } | |
2149 | ||
842951eb PA |
2150 | /* We'll update this if & when we switch to a new thread. */ |
2151 | previous_inferior_ptid = inferior_ptid; | |
2152 | ||
e58b0e63 PA |
2153 | regcache = get_current_regcache (); |
2154 | gdbarch = get_regcache_arch (regcache); | |
6c95b8df | 2155 | aspace = get_regcache_aspace (regcache); |
e58b0e63 PA |
2156 | pc = regcache_read_pc (regcache); |
2157 | ||
c906108c | 2158 | if (step > 0) |
515630c5 | 2159 | step_start_function = find_pc_function (pc); |
c906108c SS |
2160 | if (step < 0) |
2161 | stop_after_trap = 1; | |
2162 | ||
2acceee2 | 2163 | if (addr == (CORE_ADDR) -1) |
c906108c | 2164 | { |
6c95b8df | 2165 | if (pc == stop_pc && breakpoint_here_p (aspace, pc) |
b2175913 | 2166 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2167 | /* There is a breakpoint at the address we will resume at, |
2168 | step one instruction before inserting breakpoints so that | |
2169 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2170 | breakpoint). |
2171 | ||
2172 | Note, we don't do this in reverse, because we won't | |
2173 | actually be executing the breakpoint insn anyway. | |
2174 | We'll be (un-)executing the previous instruction. */ | |
2175 | ||
c906108c | 2176 | oneproc = 1; |
515630c5 UW |
2177 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2178 | && gdbarch_single_step_through_delay (gdbarch, | |
2179 | get_current_frame ())) | |
3352ef37 AC |
2180 | /* We stepped onto an instruction that needs to be stepped |
2181 | again before re-inserting the breakpoint, do so. */ | |
c906108c SS |
2182 | oneproc = 1; |
2183 | } | |
2184 | else | |
2185 | { | |
515630c5 | 2186 | regcache_write_pc (regcache, addr); |
c906108c SS |
2187 | } |
2188 | ||
527159b7 | 2189 | if (debug_infrun) |
8a9de0e4 | 2190 | fprintf_unfiltered (gdb_stdlog, |
5af949e3 UW |
2191 | "infrun: proceed (addr=%s, signal=%d, step=%d)\n", |
2192 | paddress (gdbarch, addr), siggnal, step); | |
527159b7 | 2193 | |
94cc34af PA |
2194 | if (non_stop) |
2195 | /* In non-stop, each thread is handled individually. The context | |
2196 | must already be set to the right thread here. */ | |
2197 | ; | |
2198 | else | |
2199 | { | |
2200 | /* In a multi-threaded task we may select another thread and | |
2201 | then continue or step. | |
c906108c | 2202 | |
94cc34af PA |
2203 | But if the old thread was stopped at a breakpoint, it will |
2204 | immediately cause another breakpoint stop without any | |
2205 | execution (i.e. it will report a breakpoint hit incorrectly). | |
2206 | So we must step over it first. | |
c906108c | 2207 | |
94cc34af PA |
2208 | prepare_to_proceed checks the current thread against the |
2209 | thread that reported the most recent event. If a step-over | |
2210 | is required it returns TRUE and sets the current thread to | |
1777feb0 | 2211 | the old thread. */ |
94cc34af PA |
2212 | if (prepare_to_proceed (step)) |
2213 | oneproc = 1; | |
2214 | } | |
c906108c | 2215 | |
4e1c45ea PA |
2216 | /* prepare_to_proceed may change the current thread. */ |
2217 | tp = inferior_thread (); | |
2218 | ||
30852783 UW |
2219 | if (oneproc) |
2220 | { | |
2221 | tp->control.trap_expected = 1; | |
2222 | /* If displaced stepping is enabled, we can step over the | |
2223 | breakpoint without hitting it, so leave all breakpoints | |
2224 | inserted. Otherwise we need to disable all breakpoints, step | |
2225 | one instruction, and then re-add them when that step is | |
2226 | finished. */ | |
2227 | if (!use_displaced_stepping (gdbarch)) | |
2228 | remove_breakpoints (); | |
2229 | } | |
2230 | ||
2231 | /* We can insert breakpoints if we're not trying to step over one, | |
2232 | or if we are stepping over one but we're using displaced stepping | |
2233 | to do so. */ | |
2234 | if (! tp->control.trap_expected || use_displaced_stepping (gdbarch)) | |
2235 | insert_breakpoints (); | |
2236 | ||
2020b7ab PA |
2237 | if (!non_stop) |
2238 | { | |
2239 | /* Pass the last stop signal to the thread we're resuming, | |
2240 | irrespective of whether the current thread is the thread that | |
2241 | got the last event or not. This was historically GDB's | |
2242 | behaviour before keeping a stop_signal per thread. */ | |
2243 | ||
2244 | struct thread_info *last_thread; | |
2245 | ptid_t last_ptid; | |
2246 | struct target_waitstatus last_status; | |
2247 | ||
2248 | get_last_target_status (&last_ptid, &last_status); | |
2249 | if (!ptid_equal (inferior_ptid, last_ptid) | |
2250 | && !ptid_equal (last_ptid, null_ptid) | |
2251 | && !ptid_equal (last_ptid, minus_one_ptid)) | |
2252 | { | |
e09875d4 | 2253 | last_thread = find_thread_ptid (last_ptid); |
2020b7ab PA |
2254 | if (last_thread) |
2255 | { | |
16c381f0 | 2256 | tp->suspend.stop_signal = last_thread->suspend.stop_signal; |
a493e3e2 | 2257 | last_thread->suspend.stop_signal = GDB_SIGNAL_0; |
2020b7ab PA |
2258 | } |
2259 | } | |
2260 | } | |
2261 | ||
a493e3e2 | 2262 | if (siggnal != GDB_SIGNAL_DEFAULT) |
16c381f0 | 2263 | tp->suspend.stop_signal = siggnal; |
c906108c SS |
2264 | /* If this signal should not be seen by program, |
2265 | give it zero. Used for debugging signals. */ | |
16c381f0 | 2266 | else if (!signal_program[tp->suspend.stop_signal]) |
a493e3e2 | 2267 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
c906108c SS |
2268 | |
2269 | annotate_starting (); | |
2270 | ||
2271 | /* Make sure that output from GDB appears before output from the | |
2272 | inferior. */ | |
2273 | gdb_flush (gdb_stdout); | |
2274 | ||
e4846b08 JJ |
2275 | /* Refresh prev_pc value just prior to resuming. This used to be |
2276 | done in stop_stepping, however, setting prev_pc there did not handle | |
2277 | scenarios such as inferior function calls or returning from | |
2278 | a function via the return command. In those cases, the prev_pc | |
2279 | value was not set properly for subsequent commands. The prev_pc value | |
2280 | is used to initialize the starting line number in the ecs. With an | |
2281 | invalid value, the gdb next command ends up stopping at the position | |
2282 | represented by the next line table entry past our start position. | |
2283 | On platforms that generate one line table entry per line, this | |
2284 | is not a problem. However, on the ia64, the compiler generates | |
2285 | extraneous line table entries that do not increase the line number. | |
2286 | When we issue the gdb next command on the ia64 after an inferior call | |
2287 | or a return command, we often end up a few instructions forward, still | |
2288 | within the original line we started. | |
2289 | ||
d5cd6034 JB |
2290 | An attempt was made to refresh the prev_pc at the same time the |
2291 | execution_control_state is initialized (for instance, just before | |
2292 | waiting for an inferior event). But this approach did not work | |
2293 | because of platforms that use ptrace, where the pc register cannot | |
2294 | be read unless the inferior is stopped. At that point, we are not | |
2295 | guaranteed the inferior is stopped and so the regcache_read_pc() call | |
2296 | can fail. Setting the prev_pc value here ensures the value is updated | |
2297 | correctly when the inferior is stopped. */ | |
4e1c45ea | 2298 | tp->prev_pc = regcache_read_pc (get_current_regcache ()); |
e4846b08 | 2299 | |
59f0d5d9 | 2300 | /* Fill in with reasonable starting values. */ |
4e1c45ea | 2301 | init_thread_stepping_state (tp); |
59f0d5d9 | 2302 | |
59f0d5d9 PA |
2303 | /* Reset to normal state. */ |
2304 | init_infwait_state (); | |
2305 | ||
c906108c | 2306 | /* Resume inferior. */ |
16c381f0 | 2307 | resume (oneproc || step || bpstat_should_step (), tp->suspend.stop_signal); |
c906108c SS |
2308 | |
2309 | /* Wait for it to stop (if not standalone) | |
2310 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 | 2311 | /* Do this only if we are not using the event loop, or if the target |
1777feb0 | 2312 | does not support asynchronous execution. */ |
362646f5 | 2313 | if (!target_can_async_p ()) |
43ff13b4 | 2314 | { |
e4c8541f | 2315 | wait_for_inferior (); |
43ff13b4 JM |
2316 | normal_stop (); |
2317 | } | |
c906108c | 2318 | } |
c906108c SS |
2319 | \f |
2320 | ||
2321 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 2322 | |
c906108c | 2323 | void |
8621d6a9 | 2324 | start_remote (int from_tty) |
c906108c | 2325 | { |
d6b48e9c | 2326 | struct inferior *inferior; |
d6b48e9c PA |
2327 | |
2328 | inferior = current_inferior (); | |
16c381f0 | 2329 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; |
43ff13b4 | 2330 | |
1777feb0 | 2331 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 2332 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 2333 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
2334 | nothing is returned (instead of just blocking). Because of this, |
2335 | targets expecting an immediate response need to, internally, set | |
2336 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 2337 | timeout. */ |
6426a772 JM |
2338 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
2339 | differentiate to its caller what the state of the target is after | |
2340 | the initial open has been performed. Here we're assuming that | |
2341 | the target has stopped. It should be possible to eventually have | |
2342 | target_open() return to the caller an indication that the target | |
2343 | is currently running and GDB state should be set to the same as | |
1777feb0 | 2344 | for an async run. */ |
e4c8541f | 2345 | wait_for_inferior (); |
8621d6a9 DJ |
2346 | |
2347 | /* Now that the inferior has stopped, do any bookkeeping like | |
2348 | loading shared libraries. We want to do this before normal_stop, | |
2349 | so that the displayed frame is up to date. */ | |
2350 | post_create_inferior (¤t_target, from_tty); | |
2351 | ||
6426a772 | 2352 | normal_stop (); |
c906108c SS |
2353 | } |
2354 | ||
2355 | /* Initialize static vars when a new inferior begins. */ | |
2356 | ||
2357 | void | |
96baa820 | 2358 | init_wait_for_inferior (void) |
c906108c SS |
2359 | { |
2360 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 2361 | |
c906108c SS |
2362 | breakpoint_init_inferior (inf_starting); |
2363 | ||
c906108c | 2364 | clear_proceed_status (); |
9f976b41 DJ |
2365 | |
2366 | stepping_past_singlestep_breakpoint = 0; | |
ca67fcb8 | 2367 | deferred_step_ptid = null_ptid; |
ca005067 DJ |
2368 | |
2369 | target_last_wait_ptid = minus_one_ptid; | |
237fc4c9 | 2370 | |
842951eb | 2371 | previous_inferior_ptid = inferior_ptid; |
0d1e5fa7 PA |
2372 | init_infwait_state (); |
2373 | ||
edb3359d DJ |
2374 | /* Discard any skipped inlined frames. */ |
2375 | clear_inline_frame_state (minus_one_ptid); | |
c906108c | 2376 | } |
237fc4c9 | 2377 | |
c906108c | 2378 | \f |
b83266a0 SS |
2379 | /* This enum encodes possible reasons for doing a target_wait, so that |
2380 | wfi can call target_wait in one place. (Ultimately the call will be | |
2381 | moved out of the infinite loop entirely.) */ | |
2382 | ||
c5aa993b JM |
2383 | enum infwait_states |
2384 | { | |
cd0fc7c3 SS |
2385 | infwait_normal_state, |
2386 | infwait_thread_hop_state, | |
d983da9c | 2387 | infwait_step_watch_state, |
cd0fc7c3 | 2388 | infwait_nonstep_watch_state |
b83266a0 SS |
2389 | }; |
2390 | ||
0d1e5fa7 PA |
2391 | /* The PTID we'll do a target_wait on.*/ |
2392 | ptid_t waiton_ptid; | |
2393 | ||
2394 | /* Current inferior wait state. */ | |
2395 | enum infwait_states infwait_state; | |
cd0fc7c3 | 2396 | |
0d1e5fa7 PA |
2397 | /* Data to be passed around while handling an event. This data is |
2398 | discarded between events. */ | |
c5aa993b | 2399 | struct execution_control_state |
488f131b | 2400 | { |
0d1e5fa7 | 2401 | ptid_t ptid; |
4e1c45ea PA |
2402 | /* The thread that got the event, if this was a thread event; NULL |
2403 | otherwise. */ | |
2404 | struct thread_info *event_thread; | |
2405 | ||
488f131b | 2406 | struct target_waitstatus ws; |
488f131b | 2407 | int random_signal; |
7e324e48 | 2408 | int stop_func_filled_in; |
488f131b JB |
2409 | CORE_ADDR stop_func_start; |
2410 | CORE_ADDR stop_func_end; | |
2c02bd72 | 2411 | const char *stop_func_name; |
488f131b JB |
2412 | int wait_some_more; |
2413 | }; | |
2414 | ||
ec9499be | 2415 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 2416 | |
568d6575 UW |
2417 | static void handle_step_into_function (struct gdbarch *gdbarch, |
2418 | struct execution_control_state *ecs); | |
2419 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
2420 | struct execution_control_state *ecs); | |
186c406b | 2421 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 2422 | struct frame_info *); |
611c83ae | 2423 | |
104c1213 JM |
2424 | static void stop_stepping (struct execution_control_state *ecs); |
2425 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 2426 | static void keep_going (struct execution_control_state *ecs); |
104c1213 | 2427 | |
252fbfc8 PA |
2428 | /* Callback for iterate over threads. If the thread is stopped, but |
2429 | the user/frontend doesn't know about that yet, go through | |
2430 | normal_stop, as if the thread had just stopped now. ARG points at | |
2431 | a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If | |
2432 | ptid_is_pid(PTID) is true, applies to all threads of the process | |
2433 | pointed at by PTID. Otherwise, apply only to the thread pointed by | |
2434 | PTID. */ | |
2435 | ||
2436 | static int | |
2437 | infrun_thread_stop_requested_callback (struct thread_info *info, void *arg) | |
2438 | { | |
2439 | ptid_t ptid = * (ptid_t *) arg; | |
2440 | ||
2441 | if ((ptid_equal (info->ptid, ptid) | |
2442 | || ptid_equal (minus_one_ptid, ptid) | |
2443 | || (ptid_is_pid (ptid) | |
2444 | && ptid_get_pid (ptid) == ptid_get_pid (info->ptid))) | |
2445 | && is_running (info->ptid) | |
2446 | && !is_executing (info->ptid)) | |
2447 | { | |
2448 | struct cleanup *old_chain; | |
2449 | struct execution_control_state ecss; | |
2450 | struct execution_control_state *ecs = &ecss; | |
2451 | ||
2452 | memset (ecs, 0, sizeof (*ecs)); | |
2453 | ||
2454 | old_chain = make_cleanup_restore_current_thread (); | |
2455 | ||
252fbfc8 PA |
2456 | /* Go through handle_inferior_event/normal_stop, so we always |
2457 | have consistent output as if the stop event had been | |
2458 | reported. */ | |
2459 | ecs->ptid = info->ptid; | |
e09875d4 | 2460 | ecs->event_thread = find_thread_ptid (info->ptid); |
252fbfc8 | 2461 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; |
a493e3e2 | 2462 | ecs->ws.value.sig = GDB_SIGNAL_0; |
252fbfc8 PA |
2463 | |
2464 | handle_inferior_event (ecs); | |
2465 | ||
2466 | if (!ecs->wait_some_more) | |
2467 | { | |
2468 | struct thread_info *tp; | |
2469 | ||
2470 | normal_stop (); | |
2471 | ||
fa4cd53f | 2472 | /* Finish off the continuations. */ |
252fbfc8 | 2473 | tp = inferior_thread (); |
fa4cd53f PA |
2474 | do_all_intermediate_continuations_thread (tp, 1); |
2475 | do_all_continuations_thread (tp, 1); | |
252fbfc8 PA |
2476 | } |
2477 | ||
2478 | do_cleanups (old_chain); | |
2479 | } | |
2480 | ||
2481 | return 0; | |
2482 | } | |
2483 | ||
2484 | /* This function is attached as a "thread_stop_requested" observer. | |
2485 | Cleanup local state that assumed the PTID was to be resumed, and | |
2486 | report the stop to the frontend. */ | |
2487 | ||
2c0b251b | 2488 | static void |
252fbfc8 PA |
2489 | infrun_thread_stop_requested (ptid_t ptid) |
2490 | { | |
fc1cf338 | 2491 | struct displaced_step_inferior_state *displaced; |
252fbfc8 PA |
2492 | |
2493 | /* PTID was requested to stop. Remove it from the displaced | |
2494 | stepping queue, so we don't try to resume it automatically. */ | |
fc1cf338 PA |
2495 | |
2496 | for (displaced = displaced_step_inferior_states; | |
2497 | displaced; | |
2498 | displaced = displaced->next) | |
252fbfc8 | 2499 | { |
fc1cf338 | 2500 | struct displaced_step_request *it, **prev_next_p; |
252fbfc8 | 2501 | |
fc1cf338 PA |
2502 | it = displaced->step_request_queue; |
2503 | prev_next_p = &displaced->step_request_queue; | |
2504 | while (it) | |
252fbfc8 | 2505 | { |
fc1cf338 PA |
2506 | if (ptid_match (it->ptid, ptid)) |
2507 | { | |
2508 | *prev_next_p = it->next; | |
2509 | it->next = NULL; | |
2510 | xfree (it); | |
2511 | } | |
252fbfc8 | 2512 | else |
fc1cf338 PA |
2513 | { |
2514 | prev_next_p = &it->next; | |
2515 | } | |
252fbfc8 | 2516 | |
fc1cf338 | 2517 | it = *prev_next_p; |
252fbfc8 | 2518 | } |
252fbfc8 PA |
2519 | } |
2520 | ||
2521 | iterate_over_threads (infrun_thread_stop_requested_callback, &ptid); | |
2522 | } | |
2523 | ||
a07daef3 PA |
2524 | static void |
2525 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
2526 | { | |
2527 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
2528 | nullify_last_target_wait_ptid (); | |
2529 | } | |
2530 | ||
4e1c45ea PA |
2531 | /* Callback for iterate_over_threads. */ |
2532 | ||
2533 | static int | |
2534 | delete_step_resume_breakpoint_callback (struct thread_info *info, void *data) | |
2535 | { | |
2536 | if (is_exited (info->ptid)) | |
2537 | return 0; | |
2538 | ||
2539 | delete_step_resume_breakpoint (info); | |
186c406b | 2540 | delete_exception_resume_breakpoint (info); |
4e1c45ea PA |
2541 | return 0; |
2542 | } | |
2543 | ||
2544 | /* In all-stop, delete the step resume breakpoint of any thread that | |
2545 | had one. In non-stop, delete the step resume breakpoint of the | |
2546 | thread that just stopped. */ | |
2547 | ||
2548 | static void | |
2549 | delete_step_thread_step_resume_breakpoint (void) | |
2550 | { | |
2551 | if (!target_has_execution | |
2552 | || ptid_equal (inferior_ptid, null_ptid)) | |
2553 | /* If the inferior has exited, we have already deleted the step | |
2554 | resume breakpoints out of GDB's lists. */ | |
2555 | return; | |
2556 | ||
2557 | if (non_stop) | |
2558 | { | |
2559 | /* If in non-stop mode, only delete the step-resume or | |
2560 | longjmp-resume breakpoint of the thread that just stopped | |
2561 | stepping. */ | |
2562 | struct thread_info *tp = inferior_thread (); | |
abbb1732 | 2563 | |
4e1c45ea | 2564 | delete_step_resume_breakpoint (tp); |
186c406b | 2565 | delete_exception_resume_breakpoint (tp); |
4e1c45ea PA |
2566 | } |
2567 | else | |
2568 | /* In all-stop mode, delete all step-resume and longjmp-resume | |
2569 | breakpoints of any thread that had them. */ | |
2570 | iterate_over_threads (delete_step_resume_breakpoint_callback, NULL); | |
2571 | } | |
2572 | ||
1777feb0 | 2573 | /* A cleanup wrapper. */ |
4e1c45ea PA |
2574 | |
2575 | static void | |
2576 | delete_step_thread_step_resume_breakpoint_cleanup (void *arg) | |
2577 | { | |
2578 | delete_step_thread_step_resume_breakpoint (); | |
2579 | } | |
2580 | ||
223698f8 DE |
2581 | /* Pretty print the results of target_wait, for debugging purposes. */ |
2582 | ||
2583 | static void | |
2584 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, | |
2585 | const struct target_waitstatus *ws) | |
2586 | { | |
2587 | char *status_string = target_waitstatus_to_string (ws); | |
2588 | struct ui_file *tmp_stream = mem_fileopen (); | |
2589 | char *text; | |
223698f8 DE |
2590 | |
2591 | /* The text is split over several lines because it was getting too long. | |
2592 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
2593 | output as a unit; we want only one timestamp printed if debug_timestamp | |
2594 | is set. */ | |
2595 | ||
2596 | fprintf_unfiltered (tmp_stream, | |
2597 | "infrun: target_wait (%d", PIDGET (waiton_ptid)); | |
2598 | if (PIDGET (waiton_ptid) != -1) | |
2599 | fprintf_unfiltered (tmp_stream, | |
2600 | " [%s]", target_pid_to_str (waiton_ptid)); | |
2601 | fprintf_unfiltered (tmp_stream, ", status) =\n"); | |
2602 | fprintf_unfiltered (tmp_stream, | |
2603 | "infrun: %d [%s],\n", | |
2604 | PIDGET (result_ptid), target_pid_to_str (result_ptid)); | |
2605 | fprintf_unfiltered (tmp_stream, | |
2606 | "infrun: %s\n", | |
2607 | status_string); | |
2608 | ||
759ef836 | 2609 | text = ui_file_xstrdup (tmp_stream, NULL); |
223698f8 DE |
2610 | |
2611 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
2612 | a gcc error: the format attribute requires a string literal. */ | |
2613 | fprintf_unfiltered (gdb_stdlog, "%s", text); | |
2614 | ||
2615 | xfree (status_string); | |
2616 | xfree (text); | |
2617 | ui_file_delete (tmp_stream); | |
2618 | } | |
2619 | ||
24291992 PA |
2620 | /* Prepare and stabilize the inferior for detaching it. E.g., |
2621 | detaching while a thread is displaced stepping is a recipe for | |
2622 | crashing it, as nothing would readjust the PC out of the scratch | |
2623 | pad. */ | |
2624 | ||
2625 | void | |
2626 | prepare_for_detach (void) | |
2627 | { | |
2628 | struct inferior *inf = current_inferior (); | |
2629 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
2630 | struct cleanup *old_chain_1; | |
2631 | struct displaced_step_inferior_state *displaced; | |
2632 | ||
2633 | displaced = get_displaced_stepping_state (inf->pid); | |
2634 | ||
2635 | /* Is any thread of this process displaced stepping? If not, | |
2636 | there's nothing else to do. */ | |
2637 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
2638 | return; | |
2639 | ||
2640 | if (debug_infrun) | |
2641 | fprintf_unfiltered (gdb_stdlog, | |
2642 | "displaced-stepping in-process while detaching"); | |
2643 | ||
2644 | old_chain_1 = make_cleanup_restore_integer (&inf->detaching); | |
2645 | inf->detaching = 1; | |
2646 | ||
2647 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
2648 | { | |
2649 | struct cleanup *old_chain_2; | |
2650 | struct execution_control_state ecss; | |
2651 | struct execution_control_state *ecs; | |
2652 | ||
2653 | ecs = &ecss; | |
2654 | memset (ecs, 0, sizeof (*ecs)); | |
2655 | ||
2656 | overlay_cache_invalid = 1; | |
2657 | ||
24291992 PA |
2658 | if (deprecated_target_wait_hook) |
2659 | ecs->ptid = deprecated_target_wait_hook (pid_ptid, &ecs->ws, 0); | |
2660 | else | |
2661 | ecs->ptid = target_wait (pid_ptid, &ecs->ws, 0); | |
2662 | ||
2663 | if (debug_infrun) | |
2664 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
2665 | ||
2666 | /* If an error happens while handling the event, propagate GDB's | |
2667 | knowledge of the executing state to the frontend/user running | |
2668 | state. */ | |
3e43a32a MS |
2669 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, |
2670 | &minus_one_ptid); | |
24291992 PA |
2671 | |
2672 | /* Now figure out what to do with the result of the result. */ | |
2673 | handle_inferior_event (ecs); | |
2674 | ||
2675 | /* No error, don't finish the state yet. */ | |
2676 | discard_cleanups (old_chain_2); | |
2677 | ||
2678 | /* Breakpoints and watchpoints are not installed on the target | |
2679 | at this point, and signals are passed directly to the | |
2680 | inferior, so this must mean the process is gone. */ | |
2681 | if (!ecs->wait_some_more) | |
2682 | { | |
2683 | discard_cleanups (old_chain_1); | |
2684 | error (_("Program exited while detaching")); | |
2685 | } | |
2686 | } | |
2687 | ||
2688 | discard_cleanups (old_chain_1); | |
2689 | } | |
2690 | ||
cd0fc7c3 | 2691 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 2692 | |
cd0fc7c3 SS |
2693 | If inferior gets a signal, we may decide to start it up again |
2694 | instead of returning. That is why there is a loop in this function. | |
2695 | When this function actually returns it means the inferior | |
2696 | should be left stopped and GDB should read more commands. */ | |
2697 | ||
2698 | void | |
e4c8541f | 2699 | wait_for_inferior (void) |
cd0fc7c3 SS |
2700 | { |
2701 | struct cleanup *old_cleanups; | |
c906108c | 2702 | |
527159b7 | 2703 | if (debug_infrun) |
ae123ec6 | 2704 | fprintf_unfiltered |
e4c8541f | 2705 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 2706 | |
4e1c45ea PA |
2707 | old_cleanups = |
2708 | make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup, NULL); | |
cd0fc7c3 | 2709 | |
c906108c SS |
2710 | while (1) |
2711 | { | |
ae25568b PA |
2712 | struct execution_control_state ecss; |
2713 | struct execution_control_state *ecs = &ecss; | |
29f49a6a PA |
2714 | struct cleanup *old_chain; |
2715 | ||
ae25568b PA |
2716 | memset (ecs, 0, sizeof (*ecs)); |
2717 | ||
ec9499be | 2718 | overlay_cache_invalid = 1; |
ec9499be | 2719 | |
9a4105ab | 2720 | if (deprecated_target_wait_hook) |
47608cb1 | 2721 | ecs->ptid = deprecated_target_wait_hook (waiton_ptid, &ecs->ws, 0); |
cd0fc7c3 | 2722 | else |
47608cb1 | 2723 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 2724 | |
f00150c9 | 2725 | if (debug_infrun) |
223698f8 | 2726 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 2727 | |
29f49a6a PA |
2728 | /* If an error happens while handling the event, propagate GDB's |
2729 | knowledge of the executing state to the frontend/user running | |
2730 | state. */ | |
2731 | old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2732 | ||
cd0fc7c3 SS |
2733 | /* Now figure out what to do with the result of the result. */ |
2734 | handle_inferior_event (ecs); | |
c906108c | 2735 | |
29f49a6a PA |
2736 | /* No error, don't finish the state yet. */ |
2737 | discard_cleanups (old_chain); | |
2738 | ||
cd0fc7c3 SS |
2739 | if (!ecs->wait_some_more) |
2740 | break; | |
2741 | } | |
4e1c45ea | 2742 | |
cd0fc7c3 SS |
2743 | do_cleanups (old_cleanups); |
2744 | } | |
c906108c | 2745 | |
1777feb0 | 2746 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 2747 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
2748 | descriptor corresponding to the target. It can be called more than |
2749 | once to complete a single execution command. In such cases we need | |
2750 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
2751 | that this function is called for a single execution command, then |
2752 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 2753 | necessary cleanups. */ |
43ff13b4 JM |
2754 | |
2755 | void | |
fba45db2 | 2756 | fetch_inferior_event (void *client_data) |
43ff13b4 | 2757 | { |
0d1e5fa7 | 2758 | struct execution_control_state ecss; |
a474d7c2 | 2759 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 2760 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 2761 | struct cleanup *ts_old_chain; |
4f8d22e3 | 2762 | int was_sync = sync_execution; |
0f641c01 | 2763 | int cmd_done = 0; |
43ff13b4 | 2764 | |
0d1e5fa7 PA |
2765 | memset (ecs, 0, sizeof (*ecs)); |
2766 | ||
c5187ac6 PA |
2767 | /* We're handling a live event, so make sure we're doing live |
2768 | debugging. If we're looking at traceframes while the target is | |
2769 | running, we're going to need to get back to that mode after | |
2770 | handling the event. */ | |
2771 | if (non_stop) | |
2772 | { | |
2773 | make_cleanup_restore_current_traceframe (); | |
e6e4e701 | 2774 | set_current_traceframe (-1); |
c5187ac6 PA |
2775 | } |
2776 | ||
4f8d22e3 PA |
2777 | if (non_stop) |
2778 | /* In non-stop mode, the user/frontend should not notice a thread | |
2779 | switch due to internal events. Make sure we reverse to the | |
2780 | user selected thread and frame after handling the event and | |
2781 | running any breakpoint commands. */ | |
2782 | make_cleanup_restore_current_thread (); | |
2783 | ||
ec9499be | 2784 | overlay_cache_invalid = 1; |
3dd5b83d | 2785 | |
32231432 PA |
2786 | make_cleanup_restore_integer (&execution_direction); |
2787 | execution_direction = target_execution_direction (); | |
2788 | ||
9a4105ab | 2789 | if (deprecated_target_wait_hook) |
a474d7c2 | 2790 | ecs->ptid = |
47608cb1 | 2791 | deprecated_target_wait_hook (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 2792 | else |
47608cb1 | 2793 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 2794 | |
f00150c9 | 2795 | if (debug_infrun) |
223698f8 | 2796 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 2797 | |
29f49a6a PA |
2798 | /* If an error happens while handling the event, propagate GDB's |
2799 | knowledge of the executing state to the frontend/user running | |
2800 | state. */ | |
2801 | if (!non_stop) | |
2802 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2803 | else | |
2804 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
2805 | ||
353d1d73 JK |
2806 | /* Get executed before make_cleanup_restore_current_thread above to apply |
2807 | still for the thread which has thrown the exception. */ | |
2808 | make_bpstat_clear_actions_cleanup (); | |
2809 | ||
43ff13b4 | 2810 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 2811 | handle_inferior_event (ecs); |
43ff13b4 | 2812 | |
a474d7c2 | 2813 | if (!ecs->wait_some_more) |
43ff13b4 | 2814 | { |
d6b48e9c PA |
2815 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); |
2816 | ||
4e1c45ea | 2817 | delete_step_thread_step_resume_breakpoint (); |
f107f563 | 2818 | |
d6b48e9c | 2819 | /* We may not find an inferior if this was a process exit. */ |
16c381f0 | 2820 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) |
83c265ab PA |
2821 | normal_stop (); |
2822 | ||
af679fd0 | 2823 | if (target_has_execution |
0e5bf2a8 | 2824 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED |
af679fd0 PA |
2825 | && ecs->ws.kind != TARGET_WAITKIND_EXITED |
2826 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
2827 | && ecs->event_thread->step_multi | |
16c381f0 | 2828 | && ecs->event_thread->control.stop_step) |
c2d11a7d JM |
2829 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); |
2830 | else | |
0f641c01 PA |
2831 | { |
2832 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
2833 | cmd_done = 1; | |
2834 | } | |
43ff13b4 | 2835 | } |
4f8d22e3 | 2836 | |
29f49a6a PA |
2837 | /* No error, don't finish the thread states yet. */ |
2838 | discard_cleanups (ts_old_chain); | |
2839 | ||
4f8d22e3 PA |
2840 | /* Revert thread and frame. */ |
2841 | do_cleanups (old_chain); | |
2842 | ||
2843 | /* If the inferior was in sync execution mode, and now isn't, | |
0f641c01 PA |
2844 | restore the prompt (a synchronous execution command has finished, |
2845 | and we're ready for input). */ | |
b4a14fd0 | 2846 | if (interpreter_async && was_sync && !sync_execution) |
4f8d22e3 | 2847 | display_gdb_prompt (0); |
0f641c01 PA |
2848 | |
2849 | if (cmd_done | |
2850 | && !was_sync | |
2851 | && exec_done_display_p | |
2852 | && (ptid_equal (inferior_ptid, null_ptid) | |
2853 | || !is_running (inferior_ptid))) | |
2854 | printf_unfiltered (_("completed.\n")); | |
43ff13b4 JM |
2855 | } |
2856 | ||
edb3359d DJ |
2857 | /* Record the frame and location we're currently stepping through. */ |
2858 | void | |
2859 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
2860 | { | |
2861 | struct thread_info *tp = inferior_thread (); | |
2862 | ||
16c381f0 JK |
2863 | tp->control.step_frame_id = get_frame_id (frame); |
2864 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
2865 | |
2866 | tp->current_symtab = sal.symtab; | |
2867 | tp->current_line = sal.line; | |
2868 | } | |
2869 | ||
0d1e5fa7 PA |
2870 | /* Clear context switchable stepping state. */ |
2871 | ||
2872 | void | |
4e1c45ea | 2873 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 PA |
2874 | { |
2875 | tss->stepping_over_breakpoint = 0; | |
2876 | tss->step_after_step_resume_breakpoint = 0; | |
cd0fc7c3 SS |
2877 | } |
2878 | ||
e02bc4cc | 2879 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
2880 | target_wait()/deprecated_target_wait_hook(). The data is actually |
2881 | cached by handle_inferior_event(), which gets called immediately | |
2882 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
2883 | |
2884 | void | |
488f131b | 2885 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 2886 | { |
39f77062 | 2887 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
2888 | *status = target_last_waitstatus; |
2889 | } | |
2890 | ||
ac264b3b MS |
2891 | void |
2892 | nullify_last_target_wait_ptid (void) | |
2893 | { | |
2894 | target_last_wait_ptid = minus_one_ptid; | |
2895 | } | |
2896 | ||
dcf4fbde | 2897 | /* Switch thread contexts. */ |
dd80620e MS |
2898 | |
2899 | static void | |
0d1e5fa7 | 2900 | context_switch (ptid_t ptid) |
dd80620e | 2901 | { |
4b51d87b | 2902 | if (debug_infrun && !ptid_equal (ptid, inferior_ptid)) |
fd48f117 DJ |
2903 | { |
2904 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
2905 | target_pid_to_str (inferior_ptid)); | |
2906 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 2907 | target_pid_to_str (ptid)); |
fd48f117 DJ |
2908 | } |
2909 | ||
0d1e5fa7 | 2910 | switch_to_thread (ptid); |
dd80620e MS |
2911 | } |
2912 | ||
4fa8626c DJ |
2913 | static void |
2914 | adjust_pc_after_break (struct execution_control_state *ecs) | |
2915 | { | |
24a73cce UW |
2916 | struct regcache *regcache; |
2917 | struct gdbarch *gdbarch; | |
6c95b8df | 2918 | struct address_space *aspace; |
8aad930b | 2919 | CORE_ADDR breakpoint_pc; |
4fa8626c | 2920 | |
4fa8626c DJ |
2921 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
2922 | we aren't, just return. | |
9709f61c DJ |
2923 | |
2924 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
2925 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
2926 | implemented by software breakpoints should be handled through the normal | |
2927 | breakpoint layer. | |
8fb3e588 | 2928 | |
4fa8626c DJ |
2929 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
2930 | different signals (SIGILL or SIGEMT for instance), but it is less | |
2931 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
2932 | gdbarch_decr_pc_after_break. I don't know any specific target that |
2933 | generates these signals at breakpoints (the code has been in GDB since at | |
2934 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 2935 | |
e6cf7916 UW |
2936 | In earlier versions of GDB, a target with |
2937 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
2938 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
2939 | target with both of these set in GDB history, and it seems unlikely to be | |
2940 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c DJ |
2941 | |
2942 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
2943 | return; | |
2944 | ||
a493e3e2 | 2945 | if (ecs->ws.value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
2946 | return; |
2947 | ||
4058b839 PA |
2948 | /* In reverse execution, when a breakpoint is hit, the instruction |
2949 | under it has already been de-executed. The reported PC always | |
2950 | points at the breakpoint address, so adjusting it further would | |
2951 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
2952 | architecture: | |
2953 | ||
2954 | B1 0x08000000 : INSN1 | |
2955 | B2 0x08000001 : INSN2 | |
2956 | 0x08000002 : INSN3 | |
2957 | PC -> 0x08000003 : INSN4 | |
2958 | ||
2959 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
2960 | from that point should hit B2 as below. Reading the PC when the | |
2961 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
2962 | been de-executed already. | |
2963 | ||
2964 | B1 0x08000000 : INSN1 | |
2965 | B2 PC -> 0x08000001 : INSN2 | |
2966 | 0x08000002 : INSN3 | |
2967 | 0x08000003 : INSN4 | |
2968 | ||
2969 | We can't apply the same logic as for forward execution, because | |
2970 | we would wrongly adjust the PC to 0x08000000, since there's a | |
2971 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
2972 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
2973 | behaviour. */ | |
2974 | if (execution_direction == EXEC_REVERSE) | |
2975 | return; | |
2976 | ||
24a73cce UW |
2977 | /* If this target does not decrement the PC after breakpoints, then |
2978 | we have nothing to do. */ | |
2979 | regcache = get_thread_regcache (ecs->ptid); | |
2980 | gdbarch = get_regcache_arch (regcache); | |
2981 | if (gdbarch_decr_pc_after_break (gdbarch) == 0) | |
2982 | return; | |
2983 | ||
6c95b8df PA |
2984 | aspace = get_regcache_aspace (regcache); |
2985 | ||
8aad930b AC |
2986 | /* Find the location where (if we've hit a breakpoint) the |
2987 | breakpoint would be. */ | |
515630c5 UW |
2988 | breakpoint_pc = regcache_read_pc (regcache) |
2989 | - gdbarch_decr_pc_after_break (gdbarch); | |
8aad930b | 2990 | |
1c5cfe86 PA |
2991 | /* Check whether there actually is a software breakpoint inserted at |
2992 | that location. | |
2993 | ||
2994 | If in non-stop mode, a race condition is possible where we've | |
2995 | removed a breakpoint, but stop events for that breakpoint were | |
2996 | already queued and arrive later. To suppress those spurious | |
2997 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
2998 | and retire them after a number of stop events are reported. */ | |
6c95b8df PA |
2999 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
3000 | || (non_stop && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 3001 | { |
96429cc8 | 3002 | struct cleanup *old_cleanups = NULL; |
abbb1732 | 3003 | |
96429cc8 HZ |
3004 | if (RECORD_IS_USED) |
3005 | old_cleanups = record_gdb_operation_disable_set (); | |
3006 | ||
1c0fdd0e UW |
3007 | /* When using hardware single-step, a SIGTRAP is reported for both |
3008 | a completed single-step and a software breakpoint. Need to | |
3009 | differentiate between the two, as the latter needs adjusting | |
3010 | but the former does not. | |
3011 | ||
3012 | The SIGTRAP can be due to a completed hardware single-step only if | |
3013 | - we didn't insert software single-step breakpoints | |
3014 | - the thread to be examined is still the current thread | |
3015 | - this thread is currently being stepped | |
3016 | ||
3017 | If any of these events did not occur, we must have stopped due | |
3018 | to hitting a software breakpoint, and have to back up to the | |
3019 | breakpoint address. | |
3020 | ||
3021 | As a special case, we could have hardware single-stepped a | |
3022 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
3023 | we also need to back up to the breakpoint address. */ | |
3024 | ||
3025 | if (singlestep_breakpoints_inserted_p | |
3026 | || !ptid_equal (ecs->ptid, inferior_ptid) | |
4e1c45ea PA |
3027 | || !currently_stepping (ecs->event_thread) |
3028 | || ecs->event_thread->prev_pc == breakpoint_pc) | |
515630c5 | 3029 | regcache_write_pc (regcache, breakpoint_pc); |
96429cc8 HZ |
3030 | |
3031 | if (RECORD_IS_USED) | |
3032 | do_cleanups (old_cleanups); | |
8aad930b | 3033 | } |
4fa8626c DJ |
3034 | } |
3035 | ||
0d1e5fa7 PA |
3036 | void |
3037 | init_infwait_state (void) | |
3038 | { | |
3039 | waiton_ptid = pid_to_ptid (-1); | |
3040 | infwait_state = infwait_normal_state; | |
3041 | } | |
3042 | ||
94cc34af PA |
3043 | void |
3044 | error_is_running (void) | |
3045 | { | |
3e43a32a MS |
3046 | error (_("Cannot execute this command while " |
3047 | "the selected thread is running.")); | |
94cc34af PA |
3048 | } |
3049 | ||
3050 | void | |
3051 | ensure_not_running (void) | |
3052 | { | |
3053 | if (is_running (inferior_ptid)) | |
3054 | error_is_running (); | |
3055 | } | |
3056 | ||
edb3359d DJ |
3057 | static int |
3058 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
3059 | { | |
3060 | for (frame = get_prev_frame (frame); | |
3061 | frame != NULL; | |
3062 | frame = get_prev_frame (frame)) | |
3063 | { | |
3064 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
3065 | return 1; | |
3066 | if (get_frame_type (frame) != INLINE_FRAME) | |
3067 | break; | |
3068 | } | |
3069 | ||
3070 | return 0; | |
3071 | } | |
3072 | ||
a96d9b2e SDJ |
3073 | /* Auxiliary function that handles syscall entry/return events. |
3074 | It returns 1 if the inferior should keep going (and GDB | |
3075 | should ignore the event), or 0 if the event deserves to be | |
3076 | processed. */ | |
ca2163eb | 3077 | |
a96d9b2e | 3078 | static int |
ca2163eb | 3079 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 3080 | { |
ca2163eb PA |
3081 | struct regcache *regcache; |
3082 | struct gdbarch *gdbarch; | |
3083 | int syscall_number; | |
3084 | ||
3085 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3086 | context_switch (ecs->ptid); | |
3087 | ||
3088 | regcache = get_thread_regcache (ecs->ptid); | |
3089 | gdbarch = get_regcache_arch (regcache); | |
f90263c1 | 3090 | syscall_number = ecs->ws.value.syscall_number; |
ca2163eb PA |
3091 | stop_pc = regcache_read_pc (regcache); |
3092 | ||
a96d9b2e SDJ |
3093 | if (catch_syscall_enabled () > 0 |
3094 | && catching_syscall_number (syscall_number) > 0) | |
3095 | { | |
3096 | if (debug_infrun) | |
3097 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
3098 | syscall_number); | |
a96d9b2e | 3099 | |
16c381f0 | 3100 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 3101 | = bpstat_stop_status (get_regcache_aspace (regcache), |
09ac7c10 | 3102 | stop_pc, ecs->ptid, &ecs->ws); |
16c381f0 JK |
3103 | ecs->random_signal |
3104 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat); | |
a96d9b2e | 3105 | |
ca2163eb PA |
3106 | if (!ecs->random_signal) |
3107 | { | |
3108 | /* Catchpoint hit. */ | |
a493e3e2 | 3109 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_TRAP; |
ca2163eb PA |
3110 | return 0; |
3111 | } | |
a96d9b2e | 3112 | } |
ca2163eb PA |
3113 | |
3114 | /* If no catchpoint triggered for this, then keep going. */ | |
a493e3e2 | 3115 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
ca2163eb PA |
3116 | keep_going (ecs); |
3117 | return 1; | |
a96d9b2e SDJ |
3118 | } |
3119 | ||
7e324e48 GB |
3120 | /* Clear the supplied execution_control_state's stop_func_* fields. */ |
3121 | ||
3122 | static void | |
3123 | clear_stop_func (struct execution_control_state *ecs) | |
3124 | { | |
3125 | ecs->stop_func_filled_in = 0; | |
3126 | ecs->stop_func_start = 0; | |
3127 | ecs->stop_func_end = 0; | |
3128 | ecs->stop_func_name = NULL; | |
3129 | } | |
3130 | ||
3131 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ | |
3132 | ||
3133 | static void | |
3134 | fill_in_stop_func (struct gdbarch *gdbarch, | |
3135 | struct execution_control_state *ecs) | |
3136 | { | |
3137 | if (!ecs->stop_func_filled_in) | |
3138 | { | |
3139 | /* Don't care about return value; stop_func_start and stop_func_name | |
3140 | will both be 0 if it doesn't work. */ | |
3141 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
3142 | &ecs->stop_func_start, &ecs->stop_func_end); | |
3143 | ecs->stop_func_start | |
3144 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
3145 | ||
3146 | ecs->stop_func_filled_in = 1; | |
3147 | } | |
3148 | } | |
3149 | ||
cd0fc7c3 SS |
3150 | /* Given an execution control state that has been freshly filled in |
3151 | by an event from the inferior, figure out what it means and take | |
3152 | appropriate action. */ | |
c906108c | 3153 | |
ec9499be | 3154 | static void |
96baa820 | 3155 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 3156 | { |
568d6575 UW |
3157 | struct frame_info *frame; |
3158 | struct gdbarch *gdbarch; | |
d983da9c DJ |
3159 | int stopped_by_watchpoint; |
3160 | int stepped_after_stopped_by_watchpoint = 0; | |
2afb61aa | 3161 | struct symtab_and_line stop_pc_sal; |
d6b48e9c PA |
3162 | enum stop_kind stop_soon; |
3163 | ||
28736962 PA |
3164 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
3165 | { | |
3166 | /* We had an event in the inferior, but we are not interested in | |
3167 | handling it at this level. The lower layers have already | |
3168 | done what needs to be done, if anything. | |
3169 | ||
3170 | One of the possible circumstances for this is when the | |
3171 | inferior produces output for the console. The inferior has | |
3172 | not stopped, and we are ignoring the event. Another possible | |
3173 | circumstance is any event which the lower level knows will be | |
3174 | reported multiple times without an intervening resume. */ | |
3175 | if (debug_infrun) | |
3176 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
3177 | prepare_to_wait (ecs); | |
3178 | return; | |
3179 | } | |
3180 | ||
0e5bf2a8 PA |
3181 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
3182 | && target_can_async_p () && !sync_execution) | |
3183 | { | |
3184 | /* There were no unwaited-for children left in the target, but, | |
3185 | we're not synchronously waiting for events either. Just | |
3186 | ignore. Otherwise, if we were running a synchronous | |
3187 | execution command, we need to cancel it and give the user | |
3188 | back the terminal. */ | |
3189 | if (debug_infrun) | |
3190 | fprintf_unfiltered (gdb_stdlog, | |
3191 | "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n"); | |
3192 | prepare_to_wait (ecs); | |
3193 | return; | |
3194 | } | |
3195 | ||
d6b48e9c | 3196 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
0e5bf2a8 PA |
3197 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED |
3198 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
d6b48e9c PA |
3199 | { |
3200 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); | |
abbb1732 | 3201 | |
d6b48e9c | 3202 | gdb_assert (inf); |
16c381f0 | 3203 | stop_soon = inf->control.stop_soon; |
d6b48e9c PA |
3204 | } |
3205 | else | |
3206 | stop_soon = NO_STOP_QUIETLY; | |
cd0fc7c3 | 3207 | |
1777feb0 | 3208 | /* Cache the last pid/waitstatus. */ |
39f77062 | 3209 | target_last_wait_ptid = ecs->ptid; |
0d1e5fa7 | 3210 | target_last_waitstatus = ecs->ws; |
e02bc4cc | 3211 | |
ca005067 | 3212 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 3213 | stop_stack_dummy = STOP_NONE; |
ca005067 | 3214 | |
0e5bf2a8 PA |
3215 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
3216 | { | |
3217 | /* No unwaited-for children left. IOW, all resumed children | |
3218 | have exited. */ | |
3219 | if (debug_infrun) | |
3220 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
3221 | ||
3222 | stop_print_frame = 0; | |
3223 | stop_stepping (ecs); | |
3224 | return; | |
3225 | } | |
3226 | ||
8c90c137 | 3227 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 3228 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 PA |
3229 | { |
3230 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
3231 | /* If it's a new thread, add it to the thread database. */ | |
3232 | if (ecs->event_thread == NULL) | |
3233 | ecs->event_thread = add_thread (ecs->ptid); | |
3234 | } | |
88ed393a JK |
3235 | |
3236 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
3237 | adjust_pc_after_break (ecs); | |
3238 | ||
3239 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
3240 | reinit_frame_cache (); | |
3241 | ||
28736962 PA |
3242 | breakpoint_retire_moribund (); |
3243 | ||
2b009048 DJ |
3244 | /* First, distinguish signals caused by the debugger from signals |
3245 | that have to do with the program's own actions. Note that | |
3246 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
3247 | on the operating system version. Here we detect when a SIGILL or | |
3248 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
3249 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
3250 | when we're trying to execute a breakpoint instruction on a | |
3251 | non-executable stack. This happens for call dummy breakpoints | |
3252 | for architectures like SPARC that place call dummies on the | |
3253 | stack. */ | |
2b009048 | 3254 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
3255 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
3256 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
3257 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 3258 | { |
de0a0249 UW |
3259 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
3260 | ||
3261 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
3262 | regcache_read_pc (regcache))) | |
3263 | { | |
3264 | if (debug_infrun) | |
3265 | fprintf_unfiltered (gdb_stdlog, | |
3266 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 3267 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 3268 | } |
2b009048 DJ |
3269 | } |
3270 | ||
28736962 PA |
3271 | /* Mark the non-executing threads accordingly. In all-stop, all |
3272 | threads of all processes are stopped when we get any event | |
3273 | reported. In non-stop mode, only the event thread stops. If | |
3274 | we're handling a process exit in non-stop mode, there's nothing | |
3275 | to do, as threads of the dead process are gone, and threads of | |
3276 | any other process were left running. */ | |
3277 | if (!non_stop) | |
3278 | set_executing (minus_one_ptid, 0); | |
3279 | else if (ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
3280 | && ecs->ws.kind != TARGET_WAITKIND_EXITED) | |
7aee8dc2 | 3281 | set_executing (ecs->ptid, 0); |
8c90c137 | 3282 | |
0d1e5fa7 | 3283 | switch (infwait_state) |
488f131b JB |
3284 | { |
3285 | case infwait_thread_hop_state: | |
527159b7 | 3286 | if (debug_infrun) |
8a9de0e4 | 3287 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); |
65e82032 | 3288 | break; |
b83266a0 | 3289 | |
488f131b | 3290 | case infwait_normal_state: |
527159b7 | 3291 | if (debug_infrun) |
8a9de0e4 | 3292 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
d983da9c DJ |
3293 | break; |
3294 | ||
3295 | case infwait_step_watch_state: | |
3296 | if (debug_infrun) | |
3297 | fprintf_unfiltered (gdb_stdlog, | |
3298 | "infrun: infwait_step_watch_state\n"); | |
3299 | ||
3300 | stepped_after_stopped_by_watchpoint = 1; | |
488f131b | 3301 | break; |
b83266a0 | 3302 | |
488f131b | 3303 | case infwait_nonstep_watch_state: |
527159b7 | 3304 | if (debug_infrun) |
8a9de0e4 AC |
3305 | fprintf_unfiltered (gdb_stdlog, |
3306 | "infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 3307 | insert_breakpoints (); |
c906108c | 3308 | |
488f131b JB |
3309 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
3310 | handle things like signals arriving and other things happening | |
3311 | in combination correctly? */ | |
3312 | stepped_after_stopped_by_watchpoint = 1; | |
3313 | break; | |
65e82032 AC |
3314 | |
3315 | default: | |
e2e0b3e5 | 3316 | internal_error (__FILE__, __LINE__, _("bad switch")); |
488f131b | 3317 | } |
ec9499be | 3318 | |
0d1e5fa7 | 3319 | infwait_state = infwait_normal_state; |
ec9499be | 3320 | waiton_ptid = pid_to_ptid (-1); |
c906108c | 3321 | |
488f131b JB |
3322 | switch (ecs->ws.kind) |
3323 | { | |
3324 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 3325 | if (debug_infrun) |
8a9de0e4 | 3326 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
b0f4b84b DJ |
3327 | /* Ignore gracefully during startup of the inferior, as it might |
3328 | be the shell which has just loaded some objects, otherwise | |
3329 | add the symbols for the newly loaded objects. Also ignore at | |
3330 | the beginning of an attach or remote session; we will query | |
3331 | the full list of libraries once the connection is | |
3332 | established. */ | |
c0236d92 | 3333 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 3334 | { |
edcc5120 TT |
3335 | struct regcache *regcache; |
3336 | ||
3337 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3338 | context_switch (ecs->ptid); | |
3339 | regcache = get_thread_regcache (ecs->ptid); | |
3340 | ||
3341 | handle_solib_event (); | |
3342 | ||
3343 | ecs->event_thread->control.stop_bpstat | |
3344 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
3345 | stop_pc, ecs->ptid, &ecs->ws); | |
3346 | ecs->random_signal | |
3347 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat); | |
3348 | ||
3349 | if (!ecs->random_signal) | |
3350 | { | |
3351 | /* A catchpoint triggered. */ | |
a493e3e2 | 3352 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_TRAP; |
edcc5120 TT |
3353 | goto process_event_stop_test; |
3354 | } | |
488f131b | 3355 | |
b0f4b84b DJ |
3356 | /* If requested, stop when the dynamic linker notifies |
3357 | gdb of events. This allows the user to get control | |
3358 | and place breakpoints in initializer routines for | |
3359 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 3360 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
3361 | if (stop_on_solib_events) |
3362 | { | |
55409f9d DJ |
3363 | /* Make sure we print "Stopped due to solib-event" in |
3364 | normal_stop. */ | |
3365 | stop_print_frame = 1; | |
3366 | ||
b0f4b84b DJ |
3367 | stop_stepping (ecs); |
3368 | return; | |
3369 | } | |
488f131b | 3370 | } |
b0f4b84b DJ |
3371 | |
3372 | /* If we are skipping through a shell, or through shared library | |
3373 | loading that we aren't interested in, resume the program. If | |
3374 | we're running the program normally, also resume. But stop if | |
3375 | we're attaching or setting up a remote connection. */ | |
3376 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
3377 | { | |
8b3ee56d PA |
3378 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3379 | context_switch (ecs->ptid); | |
3380 | ||
74960c60 VP |
3381 | /* Loading of shared libraries might have changed breakpoint |
3382 | addresses. Make sure new breakpoints are inserted. */ | |
0b02b92d UW |
3383 | if (stop_soon == NO_STOP_QUIETLY |
3384 | && !breakpoints_always_inserted_mode ()) | |
74960c60 | 3385 | insert_breakpoints (); |
a493e3e2 | 3386 | resume (0, GDB_SIGNAL_0); |
b0f4b84b DJ |
3387 | prepare_to_wait (ecs); |
3388 | return; | |
3389 | } | |
3390 | ||
3391 | break; | |
c5aa993b | 3392 | |
488f131b | 3393 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 3394 | if (debug_infrun) |
8a9de0e4 | 3395 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
64776a0b | 3396 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
8b3ee56d | 3397 | context_switch (ecs->ptid); |
a493e3e2 | 3398 | resume (0, GDB_SIGNAL_0); |
488f131b JB |
3399 | prepare_to_wait (ecs); |
3400 | return; | |
c5aa993b | 3401 | |
488f131b | 3402 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 3403 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 3404 | if (debug_infrun) |
940c3c06 PA |
3405 | { |
3406 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
3407 | fprintf_unfiltered (gdb_stdlog, | |
3408 | "infrun: TARGET_WAITKIND_EXITED\n"); | |
3409 | else | |
3410 | fprintf_unfiltered (gdb_stdlog, | |
3411 | "infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
3412 | } | |
3413 | ||
fb66883a | 3414 | inferior_ptid = ecs->ptid; |
6c95b8df PA |
3415 | set_current_inferior (find_inferior_pid (ptid_get_pid (ecs->ptid))); |
3416 | set_current_program_space (current_inferior ()->pspace); | |
3417 | handle_vfork_child_exec_or_exit (0); | |
1777feb0 | 3418 | target_terminal_ours (); /* Must do this before mourn anyway. */ |
488f131b | 3419 | |
940c3c06 PA |
3420 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
3421 | { | |
3422 | /* Record the exit code in the convenience variable $_exitcode, so | |
3423 | that the user can inspect this again later. */ | |
3424 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
3425 | (LONGEST) ecs->ws.value.integer); | |
3426 | ||
3427 | /* Also record this in the inferior itself. */ | |
3428 | current_inferior ()->has_exit_code = 1; | |
3429 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 3430 | |
940c3c06 PA |
3431 | print_exited_reason (ecs->ws.value.integer); |
3432 | } | |
3433 | else | |
3434 | print_signal_exited_reason (ecs->ws.value.sig); | |
8cf64490 | 3435 | |
488f131b JB |
3436 | gdb_flush (gdb_stdout); |
3437 | target_mourn_inferior (); | |
1c0fdd0e | 3438 | singlestep_breakpoints_inserted_p = 0; |
d03285ec | 3439 | cancel_single_step_breakpoints (); |
488f131b JB |
3440 | stop_print_frame = 0; |
3441 | stop_stepping (ecs); | |
3442 | return; | |
c5aa993b | 3443 | |
488f131b | 3444 | /* The following are the only cases in which we keep going; |
1777feb0 | 3445 | the above cases end in a continue or goto. */ |
488f131b | 3446 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 3447 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 3448 | if (debug_infrun) |
fed708ed PA |
3449 | { |
3450 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
3451 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); | |
3452 | else | |
3453 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n"); | |
3454 | } | |
c906108c | 3455 | |
e2d96639 YQ |
3456 | /* Check whether the inferior is displaced stepping. */ |
3457 | { | |
3458 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
3459 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3460 | struct displaced_step_inferior_state *displaced | |
3461 | = get_displaced_stepping_state (ptid_get_pid (ecs->ptid)); | |
3462 | ||
3463 | /* If checking displaced stepping is supported, and thread | |
3464 | ecs->ptid is displaced stepping. */ | |
3465 | if (displaced && ptid_equal (displaced->step_ptid, ecs->ptid)) | |
3466 | { | |
3467 | struct inferior *parent_inf | |
3468 | = find_inferior_pid (ptid_get_pid (ecs->ptid)); | |
3469 | struct regcache *child_regcache; | |
3470 | CORE_ADDR parent_pc; | |
3471 | ||
3472 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
3473 | indicating that the displaced stepping of syscall instruction | |
3474 | has been done. Perform cleanup for parent process here. Note | |
3475 | that this operation also cleans up the child process for vfork, | |
3476 | because their pages are shared. */ | |
a493e3e2 | 3477 | displaced_step_fixup (ecs->ptid, GDB_SIGNAL_TRAP); |
e2d96639 YQ |
3478 | |
3479 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
3480 | { | |
3481 | /* Restore scratch pad for child process. */ | |
3482 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
3483 | } | |
3484 | ||
3485 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
3486 | the child's PC is also within the scratchpad. Set the child's PC | |
3487 | to the parent's PC value, which has already been fixed up. | |
3488 | FIXME: we use the parent's aspace here, although we're touching | |
3489 | the child, because the child hasn't been added to the inferior | |
3490 | list yet at this point. */ | |
3491 | ||
3492 | child_regcache | |
3493 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
3494 | gdbarch, | |
3495 | parent_inf->aspace); | |
3496 | /* Read PC value of parent process. */ | |
3497 | parent_pc = regcache_read_pc (regcache); | |
3498 | ||
3499 | if (debug_displaced) | |
3500 | fprintf_unfiltered (gdb_stdlog, | |
3501 | "displaced: write child pc from %s to %s\n", | |
3502 | paddress (gdbarch, | |
3503 | regcache_read_pc (child_regcache)), | |
3504 | paddress (gdbarch, parent_pc)); | |
3505 | ||
3506 | regcache_write_pc (child_regcache, parent_pc); | |
3507 | } | |
3508 | } | |
3509 | ||
5a2901d9 | 3510 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 3511 | context_switch (ecs->ptid); |
5a2901d9 | 3512 | |
b242c3c2 PA |
3513 | /* Immediately detach breakpoints from the child before there's |
3514 | any chance of letting the user delete breakpoints from the | |
3515 | breakpoint lists. If we don't do this early, it's easy to | |
3516 | leave left over traps in the child, vis: "break foo; catch | |
3517 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
3518 | the fork on the last `continue', and by that time the | |
3519 | breakpoint at "foo" is long gone from the breakpoint table. | |
3520 | If we vforked, then we don't need to unpatch here, since both | |
3521 | parent and child are sharing the same memory pages; we'll | |
3522 | need to unpatch at follow/detach time instead to be certain | |
3523 | that new breakpoints added between catchpoint hit time and | |
3524 | vfork follow are detached. */ | |
3525 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
3526 | { | |
b242c3c2 PA |
3527 | /* This won't actually modify the breakpoint list, but will |
3528 | physically remove the breakpoints from the child. */ | |
d80ee84f | 3529 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
3530 | } |
3531 | ||
d03285ec UW |
3532 | if (singlestep_breakpoints_inserted_p) |
3533 | { | |
1777feb0 | 3534 | /* Pull the single step breakpoints out of the target. */ |
d03285ec UW |
3535 | remove_single_step_breakpoints (); |
3536 | singlestep_breakpoints_inserted_p = 0; | |
3537 | } | |
3538 | ||
e58b0e63 PA |
3539 | /* In case the event is caught by a catchpoint, remember that |
3540 | the event is to be followed at the next resume of the thread, | |
3541 | and not immediately. */ | |
3542 | ecs->event_thread->pending_follow = ecs->ws; | |
3543 | ||
fb14de7b | 3544 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 3545 | |
16c381f0 | 3546 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 3547 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 3548 | stop_pc, ecs->ptid, &ecs->ws); |
675bf4cb | 3549 | |
67822962 PA |
3550 | /* Note that we're interested in knowing the bpstat actually |
3551 | causes a stop, not just if it may explain the signal. | |
3552 | Software watchpoints, for example, always appear in the | |
3553 | bpstat. */ | |
16c381f0 JK |
3554 | ecs->random_signal |
3555 | = !bpstat_causes_stop (ecs->event_thread->control.stop_bpstat); | |
04e68871 DJ |
3556 | |
3557 | /* If no catchpoint triggered for this, then keep going. */ | |
3558 | if (ecs->random_signal) | |
3559 | { | |
6c95b8df PA |
3560 | ptid_t parent; |
3561 | ptid_t child; | |
e58b0e63 | 3562 | int should_resume; |
3e43a32a MS |
3563 | int follow_child |
3564 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 3565 | |
a493e3e2 | 3566 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 PA |
3567 | |
3568 | should_resume = follow_fork (); | |
3569 | ||
6c95b8df PA |
3570 | parent = ecs->ptid; |
3571 | child = ecs->ws.value.related_pid; | |
3572 | ||
3573 | /* In non-stop mode, also resume the other branch. */ | |
3574 | if (non_stop && !detach_fork) | |
3575 | { | |
3576 | if (follow_child) | |
3577 | switch_to_thread (parent); | |
3578 | else | |
3579 | switch_to_thread (child); | |
3580 | ||
3581 | ecs->event_thread = inferior_thread (); | |
3582 | ecs->ptid = inferior_ptid; | |
3583 | keep_going (ecs); | |
3584 | } | |
3585 | ||
3586 | if (follow_child) | |
3587 | switch_to_thread (child); | |
3588 | else | |
3589 | switch_to_thread (parent); | |
3590 | ||
e58b0e63 PA |
3591 | ecs->event_thread = inferior_thread (); |
3592 | ecs->ptid = inferior_ptid; | |
3593 | ||
3594 | if (should_resume) | |
3595 | keep_going (ecs); | |
3596 | else | |
3597 | stop_stepping (ecs); | |
04e68871 DJ |
3598 | return; |
3599 | } | |
a493e3e2 | 3600 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_TRAP; |
488f131b JB |
3601 | goto process_event_stop_test; |
3602 | ||
6c95b8df PA |
3603 | case TARGET_WAITKIND_VFORK_DONE: |
3604 | /* Done with the shared memory region. Re-insert breakpoints in | |
3605 | the parent, and keep going. */ | |
3606 | ||
3607 | if (debug_infrun) | |
3e43a32a MS |
3608 | fprintf_unfiltered (gdb_stdlog, |
3609 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
6c95b8df PA |
3610 | |
3611 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3612 | context_switch (ecs->ptid); | |
3613 | ||
3614 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 3615 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
6c95b8df PA |
3616 | /* This also takes care of reinserting breakpoints in the |
3617 | previously locked inferior. */ | |
3618 | keep_going (ecs); | |
3619 | return; | |
3620 | ||
488f131b | 3621 | case TARGET_WAITKIND_EXECD: |
527159b7 | 3622 | if (debug_infrun) |
fc5261f2 | 3623 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 3624 | |
5a2901d9 | 3625 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 3626 | context_switch (ecs->ptid); |
5a2901d9 | 3627 | |
d03285ec UW |
3628 | singlestep_breakpoints_inserted_p = 0; |
3629 | cancel_single_step_breakpoints (); | |
3630 | ||
fb14de7b | 3631 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
795e548f | 3632 | |
6c95b8df PA |
3633 | /* Do whatever is necessary to the parent branch of the vfork. */ |
3634 | handle_vfork_child_exec_or_exit (1); | |
3635 | ||
795e548f PA |
3636 | /* This causes the eventpoints and symbol table to be reset. |
3637 | Must do this now, before trying to determine whether to | |
3638 | stop. */ | |
71b43ef8 | 3639 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 3640 | |
16c381f0 | 3641 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 3642 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 3643 | stop_pc, ecs->ptid, &ecs->ws); |
16c381f0 JK |
3644 | ecs->random_signal |
3645 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat); | |
795e548f | 3646 | |
71b43ef8 PA |
3647 | /* Note that this may be referenced from inside |
3648 | bpstat_stop_status above, through inferior_has_execd. */ | |
3649 | xfree (ecs->ws.value.execd_pathname); | |
3650 | ecs->ws.value.execd_pathname = NULL; | |
3651 | ||
04e68871 DJ |
3652 | /* If no catchpoint triggered for this, then keep going. */ |
3653 | if (ecs->random_signal) | |
3654 | { | |
a493e3e2 | 3655 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
3656 | keep_going (ecs); |
3657 | return; | |
3658 | } | |
a493e3e2 | 3659 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_TRAP; |
488f131b JB |
3660 | goto process_event_stop_test; |
3661 | ||
b4dc5ffa MK |
3662 | /* Be careful not to try to gather much state about a thread |
3663 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 3664 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 3665 | if (debug_infrun) |
3e43a32a MS |
3666 | fprintf_unfiltered (gdb_stdlog, |
3667 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
1777feb0 | 3668 | /* Getting the current syscall number. */ |
ca2163eb | 3669 | if (handle_syscall_event (ecs) != 0) |
a96d9b2e SDJ |
3670 | return; |
3671 | goto process_event_stop_test; | |
c906108c | 3672 | |
488f131b JB |
3673 | /* Before examining the threads further, step this thread to |
3674 | get it entirely out of the syscall. (We get notice of the | |
3675 | event when the thread is just on the verge of exiting a | |
3676 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 3677 | into user code.) */ |
488f131b | 3678 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 3679 | if (debug_infrun) |
3e43a32a MS |
3680 | fprintf_unfiltered (gdb_stdlog, |
3681 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
ca2163eb | 3682 | if (handle_syscall_event (ecs) != 0) |
a96d9b2e SDJ |
3683 | return; |
3684 | goto process_event_stop_test; | |
c906108c | 3685 | |
488f131b | 3686 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 3687 | if (debug_infrun) |
8a9de0e4 | 3688 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
16c381f0 | 3689 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
488f131b | 3690 | break; |
c906108c | 3691 | |
b2175913 | 3692 | case TARGET_WAITKIND_NO_HISTORY: |
4b4e080e PA |
3693 | if (debug_infrun) |
3694 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
b2175913 | 3695 | /* Reverse execution: target ran out of history info. */ |
eab402df PA |
3696 | |
3697 | /* Pull the single step breakpoints out of the target. */ | |
3698 | if (singlestep_breakpoints_inserted_p) | |
3699 | { | |
3700 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3701 | context_switch (ecs->ptid); | |
3702 | remove_single_step_breakpoints (); | |
3703 | singlestep_breakpoints_inserted_p = 0; | |
3704 | } | |
fb14de7b | 3705 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
33d62d64 | 3706 | print_no_history_reason (); |
b2175913 MS |
3707 | stop_stepping (ecs); |
3708 | return; | |
488f131b | 3709 | } |
c906108c | 3710 | |
2020b7ab | 3711 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED) |
252fbfc8 PA |
3712 | { |
3713 | /* Do we need to clean up the state of a thread that has | |
3714 | completed a displaced single-step? (Doing so usually affects | |
3715 | the PC, so do it here, before we set stop_pc.) */ | |
16c381f0 JK |
3716 | displaced_step_fixup (ecs->ptid, |
3717 | ecs->event_thread->suspend.stop_signal); | |
252fbfc8 PA |
3718 | |
3719 | /* If we either finished a single-step or hit a breakpoint, but | |
3720 | the user wanted this thread to be stopped, pretend we got a | |
3721 | SIG0 (generic unsignaled stop). */ | |
3722 | ||
3723 | if (ecs->event_thread->stop_requested | |
a493e3e2 PA |
3724 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
3725 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
252fbfc8 | 3726 | } |
237fc4c9 | 3727 | |
515630c5 | 3728 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 3729 | |
527159b7 | 3730 | if (debug_infrun) |
237fc4c9 | 3731 | { |
5af949e3 UW |
3732 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
3733 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7f82dfc7 JK |
3734 | struct cleanup *old_chain = save_inferior_ptid (); |
3735 | ||
3736 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
3737 | |
3738 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
3739 | paddress (gdbarch, stop_pc)); | |
d92524f1 | 3740 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
3741 | { |
3742 | CORE_ADDR addr; | |
abbb1732 | 3743 | |
237fc4c9 PA |
3744 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
3745 | ||
3746 | if (target_stopped_data_address (¤t_target, &addr)) | |
3747 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
3748 | "infrun: stopped data address = %s\n", |
3749 | paddress (gdbarch, addr)); | |
237fc4c9 PA |
3750 | else |
3751 | fprintf_unfiltered (gdb_stdlog, | |
3752 | "infrun: (no data address available)\n"); | |
3753 | } | |
7f82dfc7 JK |
3754 | |
3755 | do_cleanups (old_chain); | |
237fc4c9 | 3756 | } |
527159b7 | 3757 | |
9f976b41 DJ |
3758 | if (stepping_past_singlestep_breakpoint) |
3759 | { | |
1c0fdd0e | 3760 | gdb_assert (singlestep_breakpoints_inserted_p); |
9f976b41 DJ |
3761 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
3762 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
3763 | ||
3764 | stepping_past_singlestep_breakpoint = 0; | |
3765 | ||
3766 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
3767 | breakpoint, or stopped for some other reason. It would be nice if |
3768 | we could tell, but we can't reliably. */ | |
a493e3e2 | 3769 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
8fb3e588 | 3770 | { |
527159b7 | 3771 | if (debug_infrun) |
3e43a32a MS |
3772 | fprintf_unfiltered (gdb_stdlog, |
3773 | "infrun: stepping_past_" | |
3774 | "singlestep_breakpoint\n"); | |
9f976b41 | 3775 | /* Pull the single step breakpoints out of the target. */ |
8b3ee56d PA |
3776 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3777 | context_switch (ecs->ptid); | |
e0cd558a | 3778 | remove_single_step_breakpoints (); |
9f976b41 DJ |
3779 | singlestep_breakpoints_inserted_p = 0; |
3780 | ||
3781 | ecs->random_signal = 0; | |
16c381f0 | 3782 | ecs->event_thread->control.trap_expected = 0; |
9f976b41 | 3783 | |
0d1e5fa7 | 3784 | context_switch (saved_singlestep_ptid); |
9a4105ab AC |
3785 | if (deprecated_context_hook) |
3786 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 | 3787 | |
a493e3e2 | 3788 | resume (1, GDB_SIGNAL_0); |
9f976b41 DJ |
3789 | prepare_to_wait (ecs); |
3790 | return; | |
3791 | } | |
3792 | } | |
3793 | ||
ca67fcb8 | 3794 | if (!ptid_equal (deferred_step_ptid, null_ptid)) |
6a6b96b9 | 3795 | { |
94cc34af PA |
3796 | /* In non-stop mode, there's never a deferred_step_ptid set. */ |
3797 | gdb_assert (!non_stop); | |
3798 | ||
6a6b96b9 UW |
3799 | /* If we stopped for some other reason than single-stepping, ignore |
3800 | the fact that we were supposed to switch back. */ | |
a493e3e2 | 3801 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
6a6b96b9 UW |
3802 | { |
3803 | if (debug_infrun) | |
3804 | fprintf_unfiltered (gdb_stdlog, | |
ca67fcb8 | 3805 | "infrun: handling deferred step\n"); |
6a6b96b9 UW |
3806 | |
3807 | /* Pull the single step breakpoints out of the target. */ | |
3808 | if (singlestep_breakpoints_inserted_p) | |
3809 | { | |
8b3ee56d PA |
3810 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3811 | context_switch (ecs->ptid); | |
6a6b96b9 UW |
3812 | remove_single_step_breakpoints (); |
3813 | singlestep_breakpoints_inserted_p = 0; | |
3814 | } | |
3815 | ||
cd3da28e PA |
3816 | ecs->event_thread->control.trap_expected = 0; |
3817 | ||
d25f45d9 | 3818 | context_switch (deferred_step_ptid); |
ca67fcb8 | 3819 | deferred_step_ptid = null_ptid; |
6a6b96b9 UW |
3820 | /* Suppress spurious "Switching to ..." message. */ |
3821 | previous_inferior_ptid = inferior_ptid; | |
3822 | ||
a493e3e2 | 3823 | resume (1, GDB_SIGNAL_0); |
6a6b96b9 UW |
3824 | prepare_to_wait (ecs); |
3825 | return; | |
3826 | } | |
ca67fcb8 VP |
3827 | |
3828 | deferred_step_ptid = null_ptid; | |
6a6b96b9 UW |
3829 | } |
3830 | ||
488f131b JB |
3831 | /* See if a thread hit a thread-specific breakpoint that was meant for |
3832 | another thread. If so, then step that thread past the breakpoint, | |
3833 | and continue it. */ | |
3834 | ||
a493e3e2 | 3835 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 3836 | { |
9f976b41 | 3837 | int thread_hop_needed = 0; |
cf00dfa7 VP |
3838 | struct address_space *aspace = |
3839 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
9f976b41 | 3840 | |
f8d40ec8 | 3841 | /* Check if a regular breakpoint has been hit before checking |
1777feb0 | 3842 | for a potential single step breakpoint. Otherwise, GDB will |
f8d40ec8 | 3843 | not see this breakpoint hit when stepping onto breakpoints. */ |
6c95b8df | 3844 | if (regular_breakpoint_inserted_here_p (aspace, stop_pc)) |
488f131b | 3845 | { |
c5aa993b | 3846 | ecs->random_signal = 0; |
6c95b8df | 3847 | if (!breakpoint_thread_match (aspace, stop_pc, ecs->ptid)) |
9f976b41 DJ |
3848 | thread_hop_needed = 1; |
3849 | } | |
1c0fdd0e | 3850 | else if (singlestep_breakpoints_inserted_p) |
9f976b41 | 3851 | { |
fd48f117 DJ |
3852 | /* We have not context switched yet, so this should be true |
3853 | no matter which thread hit the singlestep breakpoint. */ | |
3854 | gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid)); | |
3855 | if (debug_infrun) | |
3856 | fprintf_unfiltered (gdb_stdlog, "infrun: software single step " | |
3857 | "trap for %s\n", | |
3858 | target_pid_to_str (ecs->ptid)); | |
3859 | ||
9f976b41 DJ |
3860 | ecs->random_signal = 0; |
3861 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
3862 | change when we go from single-threaded to multi-threaded. If | |
3863 | the singlestep_ptid is still in the list, assume that it is | |
3864 | really different from ecs->ptid. */ | |
3865 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
3866 | && in_thread_list (singlestep_ptid)) | |
3867 | { | |
fd48f117 DJ |
3868 | /* If the PC of the thread we were trying to single-step |
3869 | has changed, discard this event (which we were going | |
3870 | to ignore anyway), and pretend we saw that thread | |
3871 | trap. This prevents us continuously moving the | |
3872 | single-step breakpoint forward, one instruction at a | |
3873 | time. If the PC has changed, then the thread we were | |
3874 | trying to single-step has trapped or been signalled, | |
3875 | but the event has not been reported to GDB yet. | |
3876 | ||
3877 | There might be some cases where this loses signal | |
3878 | information, if a signal has arrived at exactly the | |
3879 | same time that the PC changed, but this is the best | |
3880 | we can do with the information available. Perhaps we | |
3881 | should arrange to report all events for all threads | |
3882 | when they stop, or to re-poll the remote looking for | |
3883 | this particular thread (i.e. temporarily enable | |
3884 | schedlock). */ | |
515630c5 UW |
3885 | |
3886 | CORE_ADDR new_singlestep_pc | |
3887 | = regcache_read_pc (get_thread_regcache (singlestep_ptid)); | |
3888 | ||
3889 | if (new_singlestep_pc != singlestep_pc) | |
fd48f117 | 3890 | { |
2ea28649 | 3891 | enum gdb_signal stop_signal; |
2020b7ab | 3892 | |
fd48f117 DJ |
3893 | if (debug_infrun) |
3894 | fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread," | |
3895 | " but expected thread advanced also\n"); | |
3896 | ||
3897 | /* The current context still belongs to | |
3898 | singlestep_ptid. Don't swap here, since that's | |
3899 | the context we want to use. Just fudge our | |
3900 | state and continue. */ | |
16c381f0 | 3901 | stop_signal = ecs->event_thread->suspend.stop_signal; |
a493e3e2 | 3902 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
fd48f117 | 3903 | ecs->ptid = singlestep_ptid; |
e09875d4 | 3904 | ecs->event_thread = find_thread_ptid (ecs->ptid); |
16c381f0 | 3905 | ecs->event_thread->suspend.stop_signal = stop_signal; |
515630c5 | 3906 | stop_pc = new_singlestep_pc; |
fd48f117 DJ |
3907 | } |
3908 | else | |
3909 | { | |
3910 | if (debug_infrun) | |
3911 | fprintf_unfiltered (gdb_stdlog, | |
3912 | "infrun: unexpected thread\n"); | |
3913 | ||
3914 | thread_hop_needed = 1; | |
3915 | stepping_past_singlestep_breakpoint = 1; | |
3916 | saved_singlestep_ptid = singlestep_ptid; | |
3917 | } | |
9f976b41 DJ |
3918 | } |
3919 | } | |
3920 | ||
3921 | if (thread_hop_needed) | |
8fb3e588 | 3922 | { |
9f5a595d | 3923 | struct regcache *thread_regcache; |
237fc4c9 | 3924 | int remove_status = 0; |
8fb3e588 | 3925 | |
527159b7 | 3926 | if (debug_infrun) |
8a9de0e4 | 3927 | fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); |
527159b7 | 3928 | |
b3444185 PA |
3929 | /* Switch context before touching inferior memory, the |
3930 | previous thread may have exited. */ | |
3931 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
3932 | context_switch (ecs->ptid); | |
3933 | ||
8fb3e588 | 3934 | /* Saw a breakpoint, but it was hit by the wrong thread. |
1777feb0 | 3935 | Just continue. */ |
8fb3e588 | 3936 | |
1c0fdd0e | 3937 | if (singlestep_breakpoints_inserted_p) |
488f131b | 3938 | { |
1777feb0 | 3939 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 3940 | remove_single_step_breakpoints (); |
8fb3e588 AC |
3941 | singlestep_breakpoints_inserted_p = 0; |
3942 | } | |
3943 | ||
237fc4c9 PA |
3944 | /* If the arch can displace step, don't remove the |
3945 | breakpoints. */ | |
9f5a595d UW |
3946 | thread_regcache = get_thread_regcache (ecs->ptid); |
3947 | if (!use_displaced_stepping (get_regcache_arch (thread_regcache))) | |
237fc4c9 PA |
3948 | remove_status = remove_breakpoints (); |
3949 | ||
8fb3e588 AC |
3950 | /* Did we fail to remove breakpoints? If so, try |
3951 | to set the PC past the bp. (There's at least | |
3952 | one situation in which we can fail to remove | |
3953 | the bp's: On HP-UX's that use ttrace, we can't | |
3954 | change the address space of a vforking child | |
3955 | process until the child exits (well, okay, not | |
1777feb0 | 3956 | then either :-) or execs. */ |
8fb3e588 | 3957 | if (remove_status != 0) |
9d9cd7ac | 3958 | error (_("Cannot step over breakpoint hit in wrong thread")); |
8fb3e588 AC |
3959 | else |
3960 | { /* Single step */ | |
94cc34af PA |
3961 | if (!non_stop) |
3962 | { | |
3963 | /* Only need to require the next event from this | |
3964 | thread in all-stop mode. */ | |
3965 | waiton_ptid = ecs->ptid; | |
3966 | infwait_state = infwait_thread_hop_state; | |
3967 | } | |
8fb3e588 | 3968 | |
4e1c45ea | 3969 | ecs->event_thread->stepping_over_breakpoint = 1; |
8fb3e588 | 3970 | keep_going (ecs); |
8fb3e588 AC |
3971 | return; |
3972 | } | |
488f131b | 3973 | } |
1c0fdd0e | 3974 | else if (singlestep_breakpoints_inserted_p) |
8fb3e588 | 3975 | { |
8fb3e588 AC |
3976 | ecs->random_signal = 0; |
3977 | } | |
488f131b JB |
3978 | } |
3979 | else | |
3980 | ecs->random_signal = 1; | |
c906108c | 3981 | |
488f131b | 3982 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
3983 | so, then switch to that thread. */ |
3984 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 3985 | { |
527159b7 | 3986 | if (debug_infrun) |
8a9de0e4 | 3987 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 3988 | |
0d1e5fa7 | 3989 | context_switch (ecs->ptid); |
c5aa993b | 3990 | |
9a4105ab AC |
3991 | if (deprecated_context_hook) |
3992 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 3993 | } |
c906108c | 3994 | |
568d6575 UW |
3995 | /* At this point, get hold of the now-current thread's frame. */ |
3996 | frame = get_current_frame (); | |
3997 | gdbarch = get_frame_arch (frame); | |
3998 | ||
1c0fdd0e | 3999 | if (singlestep_breakpoints_inserted_p) |
488f131b | 4000 | { |
1777feb0 | 4001 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 4002 | remove_single_step_breakpoints (); |
488f131b JB |
4003 | singlestep_breakpoints_inserted_p = 0; |
4004 | } | |
c906108c | 4005 | |
d983da9c DJ |
4006 | if (stepped_after_stopped_by_watchpoint) |
4007 | stopped_by_watchpoint = 0; | |
4008 | else | |
4009 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
4010 | ||
4011 | /* If necessary, step over this watchpoint. We'll be back to display | |
4012 | it in a moment. */ | |
4013 | if (stopped_by_watchpoint | |
d92524f1 | 4014 | && (target_have_steppable_watchpoint |
568d6575 | 4015 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 4016 | { |
488f131b JB |
4017 | /* At this point, we are stopped at an instruction which has |
4018 | attempted to write to a piece of memory under control of | |
4019 | a watchpoint. The instruction hasn't actually executed | |
4020 | yet. If we were to evaluate the watchpoint expression | |
4021 | now, we would get the old value, and therefore no change | |
4022 | would seem to have occurred. | |
4023 | ||
4024 | In order to make watchpoints work `right', we really need | |
4025 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
4026 | watchpoint expression. We do this by single-stepping the |
4027 | target. | |
4028 | ||
4029 | It may not be necessary to disable the watchpoint to stop over | |
4030 | it. For example, the PA can (with some kernel cooperation) | |
4031 | single step over a watchpoint without disabling the watchpoint. | |
4032 | ||
4033 | It is far more common to need to disable a watchpoint to step | |
4034 | the inferior over it. If we have non-steppable watchpoints, | |
4035 | we must disable the current watchpoint; it's simplest to | |
4036 | disable all watchpoints and breakpoints. */ | |
2facfe5c DD |
4037 | int hw_step = 1; |
4038 | ||
d92524f1 | 4039 | if (!target_have_steppable_watchpoint) |
2455069d UW |
4040 | { |
4041 | remove_breakpoints (); | |
4042 | /* See comment in resume why we need to stop bypassing signals | |
4043 | while breakpoints have been removed. */ | |
4044 | target_pass_signals (0, NULL); | |
4045 | } | |
2facfe5c | 4046 | /* Single step */ |
568d6575 | 4047 | hw_step = maybe_software_singlestep (gdbarch, stop_pc); |
a493e3e2 | 4048 | target_resume (ecs->ptid, hw_step, GDB_SIGNAL_0); |
0d1e5fa7 | 4049 | waiton_ptid = ecs->ptid; |
d92524f1 | 4050 | if (target_have_steppable_watchpoint) |
0d1e5fa7 | 4051 | infwait_state = infwait_step_watch_state; |
d983da9c | 4052 | else |
0d1e5fa7 | 4053 | infwait_state = infwait_nonstep_watch_state; |
488f131b JB |
4054 | prepare_to_wait (ecs); |
4055 | return; | |
4056 | } | |
4057 | ||
7e324e48 | 4058 | clear_stop_func (ecs); |
4e1c45ea | 4059 | ecs->event_thread->stepping_over_breakpoint = 0; |
16c381f0 JK |
4060 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
4061 | ecs->event_thread->control.stop_step = 0; | |
488f131b JB |
4062 | stop_print_frame = 1; |
4063 | ecs->random_signal = 0; | |
4064 | stopped_by_random_signal = 0; | |
488f131b | 4065 | |
edb3359d DJ |
4066 | /* Hide inlined functions starting here, unless we just performed stepi or |
4067 | nexti. After stepi and nexti, always show the innermost frame (not any | |
4068 | inline function call sites). */ | |
16c381f0 | 4069 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f GB |
4070 | { |
4071 | struct address_space *aspace = | |
4072 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
4073 | ||
4074 | /* skip_inline_frames is expensive, so we avoid it if we can | |
4075 | determine that the address is one where functions cannot have | |
4076 | been inlined. This improves performance with inferiors that | |
4077 | load a lot of shared libraries, because the solib event | |
4078 | breakpoint is defined as the address of a function (i.e. not | |
4079 | inline). Note that we have to check the previous PC as well | |
4080 | as the current one to catch cases when we have just | |
4081 | single-stepped off a breakpoint prior to reinstating it. | |
4082 | Note that we're assuming that the code we single-step to is | |
4083 | not inline, but that's not definitive: there's nothing | |
4084 | preventing the event breakpoint function from containing | |
4085 | inlined code, and the single-step ending up there. If the | |
4086 | user had set a breakpoint on that inlined code, the missing | |
4087 | skip_inline_frames call would break things. Fortunately | |
4088 | that's an extremely unlikely scenario. */ | |
09ac7c10 | 4089 | if (!pc_at_non_inline_function (aspace, stop_pc, &ecs->ws) |
a210c238 MR |
4090 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
4091 | && ecs->event_thread->control.trap_expected | |
4092 | && pc_at_non_inline_function (aspace, | |
4093 | ecs->event_thread->prev_pc, | |
09ac7c10 | 4094 | &ecs->ws))) |
1c5a993e MR |
4095 | { |
4096 | skip_inline_frames (ecs->ptid); | |
4097 | ||
4098 | /* Re-fetch current thread's frame in case that invalidated | |
4099 | the frame cache. */ | |
4100 | frame = get_current_frame (); | |
4101 | gdbarch = get_frame_arch (frame); | |
4102 | } | |
0574c78f | 4103 | } |
edb3359d | 4104 | |
a493e3e2 | 4105 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 4106 | && ecs->event_thread->control.trap_expected |
568d6575 | 4107 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 4108 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 4109 | { |
b50d7442 | 4110 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 4111 | also on an instruction that needs to be stepped multiple |
1777feb0 | 4112 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
4113 | with a delay slot. It needs to be stepped twice, once for |
4114 | the instruction and once for the delay slot. */ | |
4115 | int step_through_delay | |
568d6575 | 4116 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 4117 | |
527159b7 | 4118 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 4119 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
4120 | if (ecs->event_thread->control.step_range_end == 0 |
4121 | && step_through_delay) | |
3352ef37 AC |
4122 | { |
4123 | /* The user issued a continue when stopped at a breakpoint. | |
4124 | Set up for another trap and get out of here. */ | |
4e1c45ea | 4125 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
4126 | keep_going (ecs); |
4127 | return; | |
4128 | } | |
4129 | else if (step_through_delay) | |
4130 | { | |
4131 | /* The user issued a step when stopped at a breakpoint. | |
4132 | Maybe we should stop, maybe we should not - the delay | |
4133 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
4134 | case, don't decide that here, just set |
4135 | ecs->stepping_over_breakpoint, making sure we | |
4136 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 4137 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
4138 | } |
4139 | } | |
4140 | ||
488f131b JB |
4141 | /* Look at the cause of the stop, and decide what to do. |
4142 | The alternatives are: | |
0d1e5fa7 PA |
4143 | 1) stop_stepping and return; to really stop and return to the debugger, |
4144 | 2) keep_going and return to start up again | |
4e1c45ea | 4145 | (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once) |
488f131b JB |
4146 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 |
4147 | will be made according to the signal handling tables. */ | |
4148 | ||
a493e3e2 | 4149 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
b0f4b84b DJ |
4150 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP |
4151 | || stop_soon == STOP_QUIETLY_REMOTE) | |
488f131b | 4152 | { |
a493e3e2 | 4153 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 4154 | && stop_after_trap) |
488f131b | 4155 | { |
527159b7 | 4156 | if (debug_infrun) |
8a9de0e4 | 4157 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); |
488f131b JB |
4158 | stop_print_frame = 0; |
4159 | stop_stepping (ecs); | |
4160 | return; | |
4161 | } | |
c54cfec8 EZ |
4162 | |
4163 | /* This is originated from start_remote(), start_inferior() and | |
4164 | shared libraries hook functions. */ | |
b0f4b84b | 4165 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
488f131b | 4166 | { |
527159b7 | 4167 | if (debug_infrun) |
8a9de0e4 | 4168 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); |
488f131b JB |
4169 | stop_stepping (ecs); |
4170 | return; | |
4171 | } | |
4172 | ||
c54cfec8 | 4173 | /* This originates from attach_command(). We need to overwrite |
a0d21d28 PA |
4174 | the stop_signal here, because some kernels don't ignore a |
4175 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
4176 | See more comments in inferior.h. On the other hand, if we | |
a0ef4274 | 4177 | get a non-SIGSTOP, report it to the user - assume the backend |
a0d21d28 PA |
4178 | will handle the SIGSTOP if it should show up later. |
4179 | ||
4180 | Also consider that the attach is complete when we see a | |
4181 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
4182 | target extended-remote report it instead of a SIGSTOP | |
4183 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
e0ba6746 PA |
4184 | signal, so this is no exception. |
4185 | ||
4186 | Also consider that the attach is complete when we see a | |
a493e3e2 | 4187 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell |
e0ba6746 PA |
4188 | the target to stop all threads of the inferior, in case the |
4189 | low level attach operation doesn't stop them implicitly. If | |
4190 | they weren't stopped implicitly, then the stub will report a | |
a493e3e2 | 4191 | GDB_SIGNAL_0, meaning: stopped for no particular reason |
e0ba6746 | 4192 | other than GDB's request. */ |
a0ef4274 | 4193 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP |
a493e3e2 PA |
4194 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP |
4195 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
4196 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
c54cfec8 EZ |
4197 | { |
4198 | stop_stepping (ecs); | |
a493e3e2 | 4199 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
c54cfec8 EZ |
4200 | return; |
4201 | } | |
4202 | ||
09ac7c10 TT |
4203 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
4204 | handles this event. */ | |
16c381f0 | 4205 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4206 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 4207 | stop_pc, ecs->ptid, &ecs->ws); |
6c95b8df | 4208 | |
fba57f8f VP |
4209 | /* Following in case break condition called a |
4210 | function. */ | |
4211 | stop_print_frame = 1; | |
488f131b | 4212 | |
db82e815 PA |
4213 | /* This is where we handle "moribund" watchpoints. Unlike |
4214 | software breakpoints traps, hardware watchpoint traps are | |
4215 | always distinguishable from random traps. If no high-level | |
4216 | watchpoint is associated with the reported stop data address | |
4217 | anymore, then the bpstat does not explain the signal --- | |
4218 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
4219 | set. */ | |
4220 | ||
4221 | if (debug_infrun | |
a493e3e2 | 4222 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 4223 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat) |
db82e815 | 4224 | && stopped_by_watchpoint) |
3e43a32a MS |
4225 | fprintf_unfiltered (gdb_stdlog, |
4226 | "infrun: no user watchpoint explains " | |
4227 | "watchpoint SIGTRAP, ignoring\n"); | |
db82e815 | 4228 | |
73dd234f | 4229 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
4230 | at one stage in the past included checks for an inferior |
4231 | function call's call dummy's return breakpoint. The original | |
4232 | comment, that went with the test, read: | |
73dd234f | 4233 | |
8fb3e588 AC |
4234 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
4235 | another signal besides SIGTRAP, so check here as well as | |
4236 | above.'' | |
73dd234f | 4237 | |
8002d778 | 4238 | If someone ever tries to get call dummys on a |
73dd234f | 4239 | non-executable stack to work (where the target would stop |
03cebad2 MK |
4240 | with something like a SIGSEGV), then those tests might need |
4241 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 4242 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
4243 | suspect that it won't be the case. |
4244 | ||
8fb3e588 AC |
4245 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
4246 | be necessary for call dummies on a non-executable stack on | |
4247 | SPARC. */ | |
73dd234f | 4248 | |
a493e3e2 | 4249 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 4250 | ecs->random_signal |
16c381f0 | 4251 | = !(bpstat_explains_signal (ecs->event_thread->control.stop_bpstat) |
db82e815 | 4252 | || stopped_by_watchpoint |
16c381f0 JK |
4253 | || ecs->event_thread->control.trap_expected |
4254 | || (ecs->event_thread->control.step_range_end | |
8358c15c JK |
4255 | && (ecs->event_thread->control.step_resume_breakpoint |
4256 | == NULL))); | |
488f131b JB |
4257 | else |
4258 | { | |
16c381f0 JK |
4259 | ecs->random_signal = !bpstat_explains_signal |
4260 | (ecs->event_thread->control.stop_bpstat); | |
488f131b | 4261 | if (!ecs->random_signal) |
a493e3e2 | 4262 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_TRAP; |
488f131b JB |
4263 | } |
4264 | } | |
4265 | ||
4266 | /* When we reach this point, we've pretty much decided | |
4267 | that the reason for stopping must've been a random | |
1777feb0 | 4268 | (unexpected) signal. */ |
488f131b JB |
4269 | |
4270 | else | |
4271 | ecs->random_signal = 1; | |
488f131b | 4272 | |
04e68871 | 4273 | process_event_stop_test: |
568d6575 UW |
4274 | |
4275 | /* Re-fetch current thread's frame in case we did a | |
4276 | "goto process_event_stop_test" above. */ | |
4277 | frame = get_current_frame (); | |
4278 | gdbarch = get_frame_arch (frame); | |
4279 | ||
488f131b JB |
4280 | /* For the program's own signals, act according to |
4281 | the signal handling tables. */ | |
4282 | ||
4283 | if (ecs->random_signal) | |
4284 | { | |
4285 | /* Signal not for debugging purposes. */ | |
4286 | int printed = 0; | |
24291992 | 4287 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); |
488f131b | 4288 | |
527159b7 | 4289 | if (debug_infrun) |
2020b7ab | 4290 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", |
16c381f0 | 4291 | ecs->event_thread->suspend.stop_signal); |
527159b7 | 4292 | |
488f131b JB |
4293 | stopped_by_random_signal = 1; |
4294 | ||
16c381f0 | 4295 | if (signal_print[ecs->event_thread->suspend.stop_signal]) |
488f131b JB |
4296 | { |
4297 | printed = 1; | |
4298 | target_terminal_ours_for_output (); | |
16c381f0 JK |
4299 | print_signal_received_reason |
4300 | (ecs->event_thread->suspend.stop_signal); | |
488f131b | 4301 | } |
252fbfc8 PA |
4302 | /* Always stop on signals if we're either just gaining control |
4303 | of the program, or the user explicitly requested this thread | |
4304 | to remain stopped. */ | |
d6b48e9c | 4305 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 4306 | || ecs->event_thread->stop_requested |
24291992 | 4307 | || (!inf->detaching |
16c381f0 | 4308 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b JB |
4309 | { |
4310 | stop_stepping (ecs); | |
4311 | return; | |
4312 | } | |
4313 | /* If not going to stop, give terminal back | |
4314 | if we took it away. */ | |
4315 | else if (printed) | |
4316 | target_terminal_inferior (); | |
4317 | ||
4318 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 4319 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 4320 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 4321 | |
fb14de7b | 4322 | if (ecs->event_thread->prev_pc == stop_pc |
16c381f0 | 4323 | && ecs->event_thread->control.trap_expected |
8358c15c | 4324 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
4325 | { |
4326 | /* We were just starting a new sequence, attempting to | |
4327 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 4328 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
4329 | of the stepping range so GDB needs to remember to, when |
4330 | the signal handler returns, resume stepping off that | |
4331 | breakpoint. */ | |
4332 | /* To simplify things, "continue" is forced to use the same | |
4333 | code paths as single-step - set a breakpoint at the | |
4334 | signal return address and then, once hit, step off that | |
4335 | breakpoint. */ | |
237fc4c9 PA |
4336 | if (debug_infrun) |
4337 | fprintf_unfiltered (gdb_stdlog, | |
4338 | "infrun: signal arrived while stepping over " | |
4339 | "breakpoint\n"); | |
d3169d93 | 4340 | |
2c03e5be | 4341 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 4342 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
4343 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
4344 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
4345 | keep_going (ecs); |
4346 | return; | |
68f53502 | 4347 | } |
9d799f85 | 4348 | |
16c381f0 | 4349 | if (ecs->event_thread->control.step_range_end != 0 |
a493e3e2 | 4350 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
16c381f0 JK |
4351 | && (ecs->event_thread->control.step_range_start <= stop_pc |
4352 | && stop_pc < ecs->event_thread->control.step_range_end) | |
edb3359d | 4353 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 4354 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 4355 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
4356 | { |
4357 | /* The inferior is about to take a signal that will take it | |
4358 | out of the single step range. Set a breakpoint at the | |
4359 | current PC (which is presumably where the signal handler | |
4360 | will eventually return) and then allow the inferior to | |
4361 | run free. | |
4362 | ||
4363 | Note that this is only needed for a signal delivered | |
4364 | while in the single-step range. Nested signals aren't a | |
4365 | problem as they eventually all return. */ | |
237fc4c9 PA |
4366 | if (debug_infrun) |
4367 | fprintf_unfiltered (gdb_stdlog, | |
4368 | "infrun: signal may take us out of " | |
4369 | "single-step range\n"); | |
4370 | ||
2c03e5be | 4371 | insert_hp_step_resume_breakpoint_at_frame (frame); |
2455069d UW |
4372 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
4373 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
4374 | keep_going (ecs); |
4375 | return; | |
d303a6c7 | 4376 | } |
9d799f85 AC |
4377 | |
4378 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
4379 | when either there's a nested signal, or when there's a | |
4380 | pending signal enabled just as the signal handler returns | |
4381 | (leaving the inferior at the step-resume-breakpoint without | |
4382 | actually executing it). Either way continue until the | |
4383 | breakpoint is really hit. */ | |
488f131b | 4384 | } |
e5ef252a PA |
4385 | else |
4386 | { | |
4387 | /* Handle cases caused by hitting a breakpoint. */ | |
488f131b | 4388 | |
e5ef252a PA |
4389 | CORE_ADDR jmp_buf_pc; |
4390 | struct bpstat_what what; | |
611c83ae | 4391 | |
e5ef252a | 4392 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 4393 | |
e5ef252a | 4394 | if (what.call_dummy) |
e81a37f7 | 4395 | { |
e5ef252a PA |
4396 | stop_stack_dummy = what.call_dummy; |
4397 | } | |
186c406b | 4398 | |
e5ef252a PA |
4399 | /* If we hit an internal event that triggers symbol changes, the |
4400 | current frame will be invalidated within bpstat_what (e.g., | |
4401 | if we hit an internal solib event). Re-fetch it. */ | |
4402 | frame = get_current_frame (); | |
4403 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 4404 | |
e5ef252a PA |
4405 | switch (what.main_action) |
4406 | { | |
4407 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
4408 | /* If we hit the breakpoint at longjmp while stepping, we | |
4409 | install a momentary breakpoint at the target of the | |
4410 | jmp_buf. */ | |
186c406b | 4411 | |
e81a37f7 TT |
4412 | if (debug_infrun) |
4413 | fprintf_unfiltered (gdb_stdlog, | |
e5ef252a | 4414 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); |
186c406b | 4415 | |
e5ef252a | 4416 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 4417 | |
e2e4d78b JK |
4418 | if (what.is_longjmp) |
4419 | { | |
e5ef252a PA |
4420 | struct value *arg_value; |
4421 | ||
4422 | /* If we set the longjmp breakpoint via a SystemTap | |
4423 | probe, then use it to extract the arguments. The | |
4424 | destination PC is the third argument to the | |
4425 | probe. */ | |
4426 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
4427 | if (arg_value) | |
4428 | jmp_buf_pc = value_as_address (arg_value); | |
4429 | else if (!gdbarch_get_longjmp_target_p (gdbarch) | |
4430 | || !gdbarch_get_longjmp_target (gdbarch, | |
4431 | frame, &jmp_buf_pc)) | |
e2e4d78b | 4432 | { |
e5ef252a PA |
4433 | if (debug_infrun) |
4434 | fprintf_unfiltered (gdb_stdlog, | |
4435 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
4436 | "(!gdbarch_get_longjmp_target)\n"); | |
e2e4d78b JK |
4437 | keep_going (ecs); |
4438 | return; | |
4439 | } | |
e5ef252a PA |
4440 | |
4441 | /* Insert a breakpoint at resume address. */ | |
4442 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
e2e4d78b | 4443 | } |
e5ef252a PA |
4444 | else |
4445 | check_exception_resume (ecs, frame); | |
4446 | keep_going (ecs); | |
4447 | return; | |
e2e4d78b | 4448 | |
e5ef252a PA |
4449 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
4450 | { | |
4451 | struct frame_info *init_frame; | |
e2e4d78b | 4452 | |
e5ef252a | 4453 | /* There are several cases to consider. |
e81a37f7 | 4454 | |
e5ef252a PA |
4455 | 1. The initiating frame no longer exists. In this case |
4456 | we must stop, because the exception or longjmp has gone | |
4457 | too far. | |
e81a37f7 | 4458 | |
e5ef252a PA |
4459 | 2. The initiating frame exists, and is the same as the |
4460 | current frame. We stop, because the exception or | |
4461 | longjmp has been caught. | |
c906108c | 4462 | |
e5ef252a PA |
4463 | 3. The initiating frame exists and is different from |
4464 | the current frame. This means the exception or longjmp | |
4465 | has been caught beneath the initiating frame, so keep | |
4466 | going. | |
2c03e5be | 4467 | |
e5ef252a PA |
4468 | 4. longjmp breakpoint has been placed just to protect |
4469 | against stale dummy frames and user is not interested | |
4470 | in stopping around longjmps. */ | |
2c03e5be | 4471 | |
e5ef252a PA |
4472 | if (debug_infrun) |
4473 | fprintf_unfiltered (gdb_stdlog, | |
4474 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c906108c | 4475 | |
e5ef252a PA |
4476 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
4477 | != NULL); | |
4478 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 4479 | |
e5ef252a PA |
4480 | if (what.is_longjmp) |
4481 | { | |
4482 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread->num); | |
c5aa993b | 4483 | |
e5ef252a PA |
4484 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
4485 | { | |
4486 | /* Case 4. */ | |
4487 | keep_going (ecs); | |
4488 | return; | |
4489 | } | |
4490 | } | |
c5aa993b | 4491 | |
e5ef252a | 4492 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
c5aa993b | 4493 | |
e5ef252a PA |
4494 | if (init_frame) |
4495 | { | |
4496 | struct frame_id current_id | |
4497 | = get_frame_id (get_current_frame ()); | |
4498 | if (frame_id_eq (current_id, | |
4499 | ecs->event_thread->initiating_frame)) | |
4500 | { | |
4501 | /* Case 2. Fall through. */ | |
4502 | } | |
4503 | else | |
4504 | { | |
4505 | /* Case 3. */ | |
4506 | keep_going (ecs); | |
4507 | return; | |
4508 | } | |
4509 | } | |
c5aa993b | 4510 | |
e5ef252a PA |
4511 | /* For Cases 1 and 2, remove the step-resume breakpoint, |
4512 | if it exists. */ | |
4513 | delete_step_resume_breakpoint (ecs->event_thread); | |
527159b7 | 4514 | |
e5ef252a PA |
4515 | ecs->event_thread->control.stop_step = 1; |
4516 | print_end_stepping_range_reason (); | |
4517 | stop_stepping (ecs); | |
68f53502 | 4518 | } |
e5ef252a | 4519 | return; |
488f131b | 4520 | |
e5ef252a PA |
4521 | case BPSTAT_WHAT_SINGLE: |
4522 | if (debug_infrun) | |
4523 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
4524 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4525 | /* Still need to check other stuff, at least the case where | |
4526 | we are stepping and step out of the right range. */ | |
4527 | break; | |
4528 | ||
4529 | case BPSTAT_WHAT_STEP_RESUME: | |
4530 | if (debug_infrun) | |
4531 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
4532 | ||
4533 | delete_step_resume_breakpoint (ecs->event_thread); | |
4534 | if (ecs->event_thread->control.proceed_to_finish | |
4535 | && execution_direction == EXEC_REVERSE) | |
4536 | { | |
4537 | struct thread_info *tp = ecs->event_thread; | |
4538 | ||
4539 | /* We are finishing a function in reverse, and just hit | |
4540 | the step-resume breakpoint at the start address of | |
4541 | the function, and we're almost there -- just need to | |
4542 | back up by one more single-step, which should take us | |
4543 | back to the function call. */ | |
4544 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
4545 | keep_going (ecs); | |
4546 | return; | |
4547 | } | |
4548 | fill_in_stop_func (gdbarch, ecs); | |
4549 | if (stop_pc == ecs->stop_func_start | |
4550 | && execution_direction == EXEC_REVERSE) | |
4551 | { | |
4552 | /* We are stepping over a function call in reverse, and | |
4553 | just hit the step-resume breakpoint at the start | |
4554 | address of the function. Go back to single-stepping, | |
4555 | which should take us back to the function call. */ | |
4556 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4557 | keep_going (ecs); | |
4558 | return; | |
4559 | } | |
4560 | break; | |
4561 | ||
4562 | case BPSTAT_WHAT_STOP_NOISY: | |
4563 | if (debug_infrun) | |
4564 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
4565 | stop_print_frame = 1; | |
4566 | ||
4567 | /* We are about to nuke the step_resume_breakpointt via the | |
4568 | cleanup chain, so no need to worry about it here. */ | |
4569 | ||
4570 | stop_stepping (ecs); | |
4571 | return; | |
4572 | ||
4573 | case BPSTAT_WHAT_STOP_SILENT: | |
4574 | if (debug_infrun) | |
4575 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
4576 | stop_print_frame = 0; | |
4577 | ||
4578 | /* We are about to nuke the step_resume_breakpoin via the | |
4579 | cleanup chain, so no need to worry about it here. */ | |
4580 | ||
4581 | stop_stepping (ecs); | |
4582 | return; | |
4583 | ||
4584 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
4585 | if (debug_infrun) | |
4586 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
4587 | ||
4588 | delete_step_resume_breakpoint (ecs->event_thread); | |
4589 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
4590 | { | |
4591 | /* Back when the step-resume breakpoint was inserted, we | |
4592 | were trying to single-step off a breakpoint. Go back | |
4593 | to doing that. */ | |
4594 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
4595 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4596 | keep_going (ecs); | |
4597 | return; | |
4598 | } | |
4599 | break; | |
4600 | ||
4601 | case BPSTAT_WHAT_KEEP_CHECKING: | |
4602 | break; | |
4603 | } | |
4604 | } | |
c906108c | 4605 | |
488f131b JB |
4606 | /* We come here if we hit a breakpoint but should not |
4607 | stop for it. Possibly we also were stepping | |
4608 | and should stop for that. So fall through and | |
4609 | test for stepping. But, if not stepping, | |
4610 | do not stop. */ | |
c906108c | 4611 | |
a7212384 UW |
4612 | /* In all-stop mode, if we're currently stepping but have stopped in |
4613 | some other thread, we need to switch back to the stepped thread. */ | |
4614 | if (!non_stop) | |
4615 | { | |
4616 | struct thread_info *tp; | |
abbb1732 | 4617 | |
b3444185 | 4618 | tp = iterate_over_threads (currently_stepping_or_nexting_callback, |
a7212384 UW |
4619 | ecs->event_thread); |
4620 | if (tp) | |
4621 | { | |
4622 | /* However, if the current thread is blocked on some internal | |
4623 | breakpoint, and we simply need to step over that breakpoint | |
4624 | to get it going again, do that first. */ | |
16c381f0 | 4625 | if ((ecs->event_thread->control.trap_expected |
a493e3e2 | 4626 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) |
a7212384 UW |
4627 | || ecs->event_thread->stepping_over_breakpoint) |
4628 | { | |
4629 | keep_going (ecs); | |
4630 | return; | |
4631 | } | |
4632 | ||
66852e9c PA |
4633 | /* If the stepping thread exited, then don't try to switch |
4634 | back and resume it, which could fail in several different | |
4635 | ways depending on the target. Instead, just keep going. | |
4636 | ||
4637 | We can find a stepping dead thread in the thread list in | |
4638 | two cases: | |
4639 | ||
4640 | - The target supports thread exit events, and when the | |
4641 | target tries to delete the thread from the thread list, | |
4642 | inferior_ptid pointed at the exiting thread. In such | |
4643 | case, calling delete_thread does not really remove the | |
4644 | thread from the list; instead, the thread is left listed, | |
4645 | with 'exited' state. | |
4646 | ||
4647 | - The target's debug interface does not support thread | |
4648 | exit events, and so we have no idea whatsoever if the | |
4649 | previously stepping thread is still alive. For that | |
4650 | reason, we need to synchronously query the target | |
4651 | now. */ | |
b3444185 PA |
4652 | if (is_exited (tp->ptid) |
4653 | || !target_thread_alive (tp->ptid)) | |
4654 | { | |
4655 | if (debug_infrun) | |
3e43a32a MS |
4656 | fprintf_unfiltered (gdb_stdlog, |
4657 | "infrun: not switching back to " | |
4658 | "stepped thread, it has vanished\n"); | |
b3444185 PA |
4659 | |
4660 | delete_thread (tp->ptid); | |
4661 | keep_going (ecs); | |
4662 | return; | |
4663 | } | |
4664 | ||
a7212384 UW |
4665 | /* Otherwise, we no longer expect a trap in the current thread. |
4666 | Clear the trap_expected flag before switching back -- this is | |
4667 | what keep_going would do as well, if we called it. */ | |
16c381f0 | 4668 | ecs->event_thread->control.trap_expected = 0; |
a7212384 UW |
4669 | |
4670 | if (debug_infrun) | |
4671 | fprintf_unfiltered (gdb_stdlog, | |
4672 | "infrun: switching back to stepped thread\n"); | |
4673 | ||
4674 | ecs->event_thread = tp; | |
4675 | ecs->ptid = tp->ptid; | |
4676 | context_switch (ecs->ptid); | |
4677 | keep_going (ecs); | |
4678 | return; | |
4679 | } | |
4680 | } | |
4681 | ||
8358c15c | 4682 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 4683 | { |
527159b7 | 4684 | if (debug_infrun) |
d3169d93 DJ |
4685 | fprintf_unfiltered (gdb_stdlog, |
4686 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 4687 | |
488f131b JB |
4688 | /* Having a step-resume breakpoint overrides anything |
4689 | else having to do with stepping commands until | |
4690 | that breakpoint is reached. */ | |
488f131b JB |
4691 | keep_going (ecs); |
4692 | return; | |
4693 | } | |
c5aa993b | 4694 | |
16c381f0 | 4695 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 4696 | { |
527159b7 | 4697 | if (debug_infrun) |
8a9de0e4 | 4698 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 4699 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
4700 | keep_going (ecs); |
4701 | return; | |
4702 | } | |
c5aa993b | 4703 | |
4b7703ad JB |
4704 | /* Re-fetch current thread's frame in case the code above caused |
4705 | the frame cache to be re-initialized, making our FRAME variable | |
4706 | a dangling pointer. */ | |
4707 | frame = get_current_frame (); | |
628fe4e4 | 4708 | gdbarch = get_frame_arch (frame); |
7e324e48 | 4709 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 4710 | |
488f131b | 4711 | /* If stepping through a line, keep going if still within it. |
c906108c | 4712 | |
488f131b JB |
4713 | Note that step_range_end is the address of the first instruction |
4714 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
4715 | within it! |
4716 | ||
4717 | Note also that during reverse execution, we may be stepping | |
4718 | through a function epilogue and therefore must detect when | |
4719 | the current-frame changes in the middle of a line. */ | |
4720 | ||
16c381f0 JK |
4721 | if (stop_pc >= ecs->event_thread->control.step_range_start |
4722 | && stop_pc < ecs->event_thread->control.step_range_end | |
31410e84 | 4723 | && (execution_direction != EXEC_REVERSE |
388a8562 | 4724 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 4725 | ecs->event_thread->control.step_frame_id))) |
488f131b | 4726 | { |
527159b7 | 4727 | if (debug_infrun) |
5af949e3 UW |
4728 | fprintf_unfiltered |
4729 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
4730 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
4731 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 MS |
4732 | |
4733 | /* When stepping backward, stop at beginning of line range | |
4734 | (unless it's the function entry point, in which case | |
4735 | keep going back to the call point). */ | |
16c381f0 | 4736 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
4737 | && stop_pc != ecs->stop_func_start |
4738 | && execution_direction == EXEC_REVERSE) | |
4739 | { | |
16c381f0 | 4740 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 4741 | print_end_stepping_range_reason (); |
b2175913 MS |
4742 | stop_stepping (ecs); |
4743 | } | |
4744 | else | |
4745 | keep_going (ecs); | |
4746 | ||
488f131b JB |
4747 | return; |
4748 | } | |
c5aa993b | 4749 | |
488f131b | 4750 | /* We stepped out of the stepping range. */ |
c906108c | 4751 | |
488f131b | 4752 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
4753 | loader dynamic symbol resolution code... |
4754 | ||
4755 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
4756 | time loader code and reach the callee's address. | |
4757 | ||
4758 | EXEC_REVERSE: we've already executed the callee (backward), and | |
4759 | the runtime loader code is handled just like any other | |
4760 | undebuggable function call. Now we need only keep stepping | |
4761 | backward through the trampoline code, and that's handled further | |
4762 | down, so there is nothing for us to do here. */ | |
4763 | ||
4764 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 4765 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
cfd8ab24 | 4766 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 4767 | { |
4c8c40e6 | 4768 | CORE_ADDR pc_after_resolver = |
568d6575 | 4769 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); |
c906108c | 4770 | |
527159b7 | 4771 | if (debug_infrun) |
3e43a32a MS |
4772 | fprintf_unfiltered (gdb_stdlog, |
4773 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 4774 | |
488f131b JB |
4775 | if (pc_after_resolver) |
4776 | { | |
4777 | /* Set up a step-resume breakpoint at the address | |
4778 | indicated by SKIP_SOLIB_RESOLVER. */ | |
4779 | struct symtab_and_line sr_sal; | |
abbb1732 | 4780 | |
fe39c653 | 4781 | init_sal (&sr_sal); |
488f131b | 4782 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 4783 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 4784 | |
a6d9a66e UW |
4785 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4786 | sr_sal, null_frame_id); | |
c5aa993b | 4787 | } |
c906108c | 4788 | |
488f131b JB |
4789 | keep_going (ecs); |
4790 | return; | |
4791 | } | |
c906108c | 4792 | |
16c381f0 JK |
4793 | if (ecs->event_thread->control.step_range_end != 1 |
4794 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
4795 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 4796 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 4797 | { |
527159b7 | 4798 | if (debug_infrun) |
3e43a32a MS |
4799 | fprintf_unfiltered (gdb_stdlog, |
4800 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 4801 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
4802 | a signal trampoline (either by a signal being delivered or by |
4803 | the signal handler returning). Just single-step until the | |
4804 | inferior leaves the trampoline (either by calling the handler | |
4805 | or returning). */ | |
488f131b JB |
4806 | keep_going (ecs); |
4807 | return; | |
4808 | } | |
c906108c | 4809 | |
14132e89 MR |
4810 | /* If we're in the return path from a shared library trampoline, |
4811 | we want to proceed through the trampoline when stepping. */ | |
4812 | /* macro/2012-04-25: This needs to come before the subroutine | |
4813 | call check below as on some targets return trampolines look | |
4814 | like subroutine calls (MIPS16 return thunks). */ | |
4815 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
4816 | stop_pc, ecs->stop_func_name) | |
4817 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) | |
4818 | { | |
4819 | /* Determine where this trampoline returns. */ | |
4820 | CORE_ADDR real_stop_pc; | |
4821 | ||
4822 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
4823 | ||
4824 | if (debug_infrun) | |
4825 | fprintf_unfiltered (gdb_stdlog, | |
4826 | "infrun: stepped into solib return tramp\n"); | |
4827 | ||
4828 | /* Only proceed through if we know where it's going. */ | |
4829 | if (real_stop_pc) | |
4830 | { | |
4831 | /* And put the step-breakpoint there and go until there. */ | |
4832 | struct symtab_and_line sr_sal; | |
4833 | ||
4834 | init_sal (&sr_sal); /* initialize to zeroes */ | |
4835 | sr_sal.pc = real_stop_pc; | |
4836 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
4837 | sr_sal.pspace = get_frame_program_space (frame); | |
4838 | ||
4839 | /* Do not specify what the fp should be when we stop since | |
4840 | on some machines the prologue is where the new fp value | |
4841 | is established. */ | |
4842 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
4843 | sr_sal, null_frame_id); | |
4844 | ||
4845 | /* Restart without fiddling with the step ranges or | |
4846 | other state. */ | |
4847 | keep_going (ecs); | |
4848 | return; | |
4849 | } | |
4850 | } | |
4851 | ||
c17eaafe DJ |
4852 | /* Check for subroutine calls. The check for the current frame |
4853 | equalling the step ID is not necessary - the check of the | |
4854 | previous frame's ID is sufficient - but it is a common case and | |
4855 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
4856 | |
4857 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
4858 | being equal, so to get into this block, both the current and | |
4859 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
4860 | /* The outer_frame_id check is a heuristic to detect stepping |
4861 | through startup code. If we step over an instruction which | |
4862 | sets the stack pointer from an invalid value to a valid value, | |
4863 | we may detect that as a subroutine call from the mythical | |
4864 | "outermost" function. This could be fixed by marking | |
4865 | outermost frames as !stack_p,code_p,special_p. Then the | |
4866 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 4867 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 4868 | for more. */ |
edb3359d | 4869 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 4870 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 4871 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
4872 | ecs->event_thread->control.step_stack_frame_id) |
4873 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a JB |
4874 | outer_frame_id) |
4875 | || step_start_function != find_pc_function (stop_pc)))) | |
488f131b | 4876 | { |
95918acb | 4877 | CORE_ADDR real_stop_pc; |
8fb3e588 | 4878 | |
527159b7 | 4879 | if (debug_infrun) |
8a9de0e4 | 4880 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 4881 | |
16c381f0 JK |
4882 | if ((ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
4883 | || ((ecs->event_thread->control.step_range_end == 1) | |
d80b854b | 4884 | && in_prologue (gdbarch, ecs->event_thread->prev_pc, |
4e1c45ea | 4885 | ecs->stop_func_start))) |
95918acb AC |
4886 | { |
4887 | /* I presume that step_over_calls is only 0 when we're | |
4888 | supposed to be stepping at the assembly language level | |
4889 | ("stepi"). Just stop. */ | |
4890 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
4891 | thought it was a subroutine call but it was not. Stop as | |
4892 | well. FENN */ | |
388a8562 | 4893 | /* And this works the same backward as frontward. MVS */ |
16c381f0 | 4894 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 4895 | print_end_stepping_range_reason (); |
95918acb AC |
4896 | stop_stepping (ecs); |
4897 | return; | |
4898 | } | |
8fb3e588 | 4899 | |
388a8562 MS |
4900 | /* Reverse stepping through solib trampolines. */ |
4901 | ||
4902 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 4903 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
4904 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
4905 | || (ecs->stop_func_start == 0 | |
4906 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
4907 | { | |
4908 | /* Any solib trampoline code can be handled in reverse | |
4909 | by simply continuing to single-step. We have already | |
4910 | executed the solib function (backwards), and a few | |
4911 | steps will take us back through the trampoline to the | |
4912 | caller. */ | |
4913 | keep_going (ecs); | |
4914 | return; | |
4915 | } | |
4916 | ||
16c381f0 | 4917 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 4918 | { |
b2175913 MS |
4919 | /* We're doing a "next". |
4920 | ||
4921 | Normal (forward) execution: set a breakpoint at the | |
4922 | callee's return address (the address at which the caller | |
4923 | will resume). | |
4924 | ||
4925 | Reverse (backward) execution. set the step-resume | |
4926 | breakpoint at the start of the function that we just | |
4927 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 4928 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
4929 | |
4930 | if (execution_direction == EXEC_REVERSE) | |
4931 | { | |
acf9414f JK |
4932 | /* If we're already at the start of the function, we've either |
4933 | just stepped backward into a single instruction function, | |
4934 | or stepped back out of a signal handler to the first instruction | |
4935 | of the function. Just keep going, which will single-step back | |
4936 | to the caller. */ | |
4937 | if (ecs->stop_func_start != stop_pc) | |
4938 | { | |
4939 | struct symtab_and_line sr_sal; | |
4940 | ||
4941 | /* Normal function call return (static or dynamic). */ | |
4942 | init_sal (&sr_sal); | |
4943 | sr_sal.pc = ecs->stop_func_start; | |
4944 | sr_sal.pspace = get_frame_program_space (frame); | |
4945 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
4946 | sr_sal, null_frame_id); | |
4947 | } | |
b2175913 MS |
4948 | } |
4949 | else | |
568d6575 | 4950 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 4951 | |
8567c30f AC |
4952 | keep_going (ecs); |
4953 | return; | |
4954 | } | |
a53c66de | 4955 | |
95918acb | 4956 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
4957 | calling routine and the real function), locate the real |
4958 | function. That's what tells us (a) whether we want to step | |
4959 | into it at all, and (b) what prologue we want to run to the | |
4960 | end of, if we do step into it. */ | |
568d6575 | 4961 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 4962 | if (real_stop_pc == 0) |
568d6575 | 4963 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
4964 | if (real_stop_pc != 0) |
4965 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 4966 | |
db5f024e | 4967 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 RC |
4968 | { |
4969 | struct symtab_and_line sr_sal; | |
abbb1732 | 4970 | |
1b2bfbb9 RC |
4971 | init_sal (&sr_sal); |
4972 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 4973 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 4974 | |
a6d9a66e UW |
4975 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4976 | sr_sal, null_frame_id); | |
8fb3e588 AC |
4977 | keep_going (ecs); |
4978 | return; | |
1b2bfbb9 RC |
4979 | } |
4980 | ||
95918acb | 4981 | /* If we have line number information for the function we are |
1bfeeb0f JL |
4982 | thinking of stepping into and the function isn't on the skip |
4983 | list, step into it. | |
95918acb | 4984 | |
8fb3e588 AC |
4985 | If there are several symtabs at that PC (e.g. with include |
4986 | files), just want to know whether *any* of them have line | |
4987 | numbers. find_pc_line handles this. */ | |
95918acb AC |
4988 | { |
4989 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 4990 | |
95918acb | 4991 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 JB |
4992 | if (tmp_sal.line != 0 |
4993 | && !function_pc_is_marked_for_skip (ecs->stop_func_start)) | |
95918acb | 4994 | { |
b2175913 | 4995 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 4996 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 4997 | else |
568d6575 | 4998 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
4999 | return; |
5000 | } | |
5001 | } | |
5002 | ||
5003 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
5004 | set, we stop the step so that the user has a chance to switch |
5005 | in assembly mode. */ | |
16c381f0 | 5006 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 5007 | && step_stop_if_no_debug) |
95918acb | 5008 | { |
16c381f0 | 5009 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5010 | print_end_stepping_range_reason (); |
95918acb AC |
5011 | stop_stepping (ecs); |
5012 | return; | |
5013 | } | |
5014 | ||
b2175913 MS |
5015 | if (execution_direction == EXEC_REVERSE) |
5016 | { | |
acf9414f JK |
5017 | /* If we're already at the start of the function, we've either just |
5018 | stepped backward into a single instruction function without line | |
5019 | number info, or stepped back out of a signal handler to the first | |
5020 | instruction of the function without line number info. Just keep | |
5021 | going, which will single-step back to the caller. */ | |
5022 | if (ecs->stop_func_start != stop_pc) | |
5023 | { | |
5024 | /* Set a breakpoint at callee's start address. | |
5025 | From there we can step once and be back in the caller. */ | |
5026 | struct symtab_and_line sr_sal; | |
abbb1732 | 5027 | |
acf9414f JK |
5028 | init_sal (&sr_sal); |
5029 | sr_sal.pc = ecs->stop_func_start; | |
5030 | sr_sal.pspace = get_frame_program_space (frame); | |
5031 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
5032 | sr_sal, null_frame_id); | |
5033 | } | |
b2175913 MS |
5034 | } |
5035 | else | |
5036 | /* Set a breakpoint at callee's return address (the address | |
5037 | at which the caller will resume). */ | |
568d6575 | 5038 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 5039 | |
95918acb | 5040 | keep_going (ecs); |
488f131b | 5041 | return; |
488f131b | 5042 | } |
c906108c | 5043 | |
fdd654f3 MS |
5044 | /* Reverse stepping through solib trampolines. */ |
5045 | ||
5046 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 5047 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 MS |
5048 | { |
5049 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
5050 | || (ecs->stop_func_start == 0 | |
5051 | && in_solib_dynsym_resolve_code (stop_pc))) | |
5052 | { | |
5053 | /* Any solib trampoline code can be handled in reverse | |
5054 | by simply continuing to single-step. We have already | |
5055 | executed the solib function (backwards), and a few | |
5056 | steps will take us back through the trampoline to the | |
5057 | caller. */ | |
5058 | keep_going (ecs); | |
5059 | return; | |
5060 | } | |
5061 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
5062 | { | |
5063 | /* Stepped backward into the solib dynsym resolver. | |
5064 | Set a breakpoint at its start and continue, then | |
5065 | one more step will take us out. */ | |
5066 | struct symtab_and_line sr_sal; | |
abbb1732 | 5067 | |
fdd654f3 MS |
5068 | init_sal (&sr_sal); |
5069 | sr_sal.pc = ecs->stop_func_start; | |
9d1807c3 | 5070 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
5071 | insert_step_resume_breakpoint_at_sal (gdbarch, |
5072 | sr_sal, null_frame_id); | |
5073 | keep_going (ecs); | |
5074 | return; | |
5075 | } | |
5076 | } | |
5077 | ||
2afb61aa | 5078 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 5079 | |
1b2bfbb9 RC |
5080 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
5081 | the trampoline processing logic, however, there are some trampolines | |
5082 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 5083 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 5084 | && ecs->stop_func_name == NULL |
2afb61aa | 5085 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 5086 | { |
527159b7 | 5087 | if (debug_infrun) |
3e43a32a MS |
5088 | fprintf_unfiltered (gdb_stdlog, |
5089 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 5090 | |
1b2bfbb9 | 5091 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
5092 | undebuggable function (where there is no debugging information |
5093 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
5094 | inferior stopped). Since we want to skip this kind of code, |
5095 | we keep going until the inferior returns from this | |
14e60db5 DJ |
5096 | function - unless the user has asked us not to (via |
5097 | set step-mode) or we no longer know how to get back | |
5098 | to the call site. */ | |
5099 | if (step_stop_if_no_debug | |
c7ce8faa | 5100 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
5101 | { |
5102 | /* If we have no line number and the step-stop-if-no-debug | |
5103 | is set, we stop the step so that the user has a chance to | |
5104 | switch in assembly mode. */ | |
16c381f0 | 5105 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5106 | print_end_stepping_range_reason (); |
1b2bfbb9 RC |
5107 | stop_stepping (ecs); |
5108 | return; | |
5109 | } | |
5110 | else | |
5111 | { | |
5112 | /* Set a breakpoint at callee's return address (the address | |
5113 | at which the caller will resume). */ | |
568d6575 | 5114 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
5115 | keep_going (ecs); |
5116 | return; | |
5117 | } | |
5118 | } | |
5119 | ||
16c381f0 | 5120 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
5121 | { |
5122 | /* It is stepi or nexti. We always want to stop stepping after | |
5123 | one instruction. */ | |
527159b7 | 5124 | if (debug_infrun) |
8a9de0e4 | 5125 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
16c381f0 | 5126 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5127 | print_end_stepping_range_reason (); |
1b2bfbb9 RC |
5128 | stop_stepping (ecs); |
5129 | return; | |
5130 | } | |
5131 | ||
2afb61aa | 5132 | if (stop_pc_sal.line == 0) |
488f131b JB |
5133 | { |
5134 | /* We have no line number information. That means to stop | |
5135 | stepping (does this always happen right after one instruction, | |
5136 | when we do "s" in a function with no line numbers, | |
5137 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 5138 | if (debug_infrun) |
8a9de0e4 | 5139 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
16c381f0 | 5140 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5141 | print_end_stepping_range_reason (); |
488f131b JB |
5142 | stop_stepping (ecs); |
5143 | return; | |
5144 | } | |
c906108c | 5145 | |
edb3359d DJ |
5146 | /* Look for "calls" to inlined functions, part one. If the inline |
5147 | frame machinery detected some skipped call sites, we have entered | |
5148 | a new inline function. */ | |
5149 | ||
5150 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 5151 | ecs->event_thread->control.step_frame_id) |
edb3359d DJ |
5152 | && inline_skipped_frames (ecs->ptid)) |
5153 | { | |
5154 | struct symtab_and_line call_sal; | |
5155 | ||
5156 | if (debug_infrun) | |
5157 | fprintf_unfiltered (gdb_stdlog, | |
5158 | "infrun: stepped into inlined function\n"); | |
5159 | ||
5160 | find_frame_sal (get_current_frame (), &call_sal); | |
5161 | ||
16c381f0 | 5162 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
5163 | { |
5164 | /* For "step", we're going to stop. But if the call site | |
5165 | for this inlined function is on the same source line as | |
5166 | we were previously stepping, go down into the function | |
5167 | first. Otherwise stop at the call site. */ | |
5168 | ||
5169 | if (call_sal.line == ecs->event_thread->current_line | |
5170 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
5171 | step_into_inline_frame (ecs->ptid); | |
5172 | ||
16c381f0 | 5173 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5174 | print_end_stepping_range_reason (); |
edb3359d DJ |
5175 | stop_stepping (ecs); |
5176 | return; | |
5177 | } | |
5178 | else | |
5179 | { | |
5180 | /* For "next", we should stop at the call site if it is on a | |
5181 | different source line. Otherwise continue through the | |
5182 | inlined function. */ | |
5183 | if (call_sal.line == ecs->event_thread->current_line | |
5184 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
5185 | keep_going (ecs); | |
5186 | else | |
5187 | { | |
16c381f0 | 5188 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5189 | print_end_stepping_range_reason (); |
edb3359d DJ |
5190 | stop_stepping (ecs); |
5191 | } | |
5192 | return; | |
5193 | } | |
5194 | } | |
5195 | ||
5196 | /* Look for "calls" to inlined functions, part two. If we are still | |
5197 | in the same real function we were stepping through, but we have | |
5198 | to go further up to find the exact frame ID, we are stepping | |
5199 | through a more inlined call beyond its call site. */ | |
5200 | ||
5201 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
5202 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 5203 | ecs->event_thread->control.step_frame_id) |
edb3359d | 5204 | && stepped_in_from (get_current_frame (), |
16c381f0 | 5205 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
5206 | { |
5207 | if (debug_infrun) | |
5208 | fprintf_unfiltered (gdb_stdlog, | |
5209 | "infrun: stepping through inlined function\n"); | |
5210 | ||
16c381f0 | 5211 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
5212 | keep_going (ecs); |
5213 | else | |
5214 | { | |
16c381f0 | 5215 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5216 | print_end_stepping_range_reason (); |
edb3359d DJ |
5217 | stop_stepping (ecs); |
5218 | } | |
5219 | return; | |
5220 | } | |
5221 | ||
2afb61aa | 5222 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
5223 | && (ecs->event_thread->current_line != stop_pc_sal.line |
5224 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
5225 | { |
5226 | /* We are at the start of a different line. So stop. Note that | |
5227 | we don't stop if we step into the middle of a different line. | |
5228 | That is said to make things like for (;;) statements work | |
5229 | better. */ | |
527159b7 | 5230 | if (debug_infrun) |
3e43a32a MS |
5231 | fprintf_unfiltered (gdb_stdlog, |
5232 | "infrun: stepped to a different line\n"); | |
16c381f0 | 5233 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5234 | print_end_stepping_range_reason (); |
488f131b JB |
5235 | stop_stepping (ecs); |
5236 | return; | |
5237 | } | |
c906108c | 5238 | |
488f131b | 5239 | /* We aren't done stepping. |
c906108c | 5240 | |
488f131b JB |
5241 | Optimize by setting the stepping range to the line. |
5242 | (We might not be in the original line, but if we entered a | |
5243 | new line in mid-statement, we continue stepping. This makes | |
5244 | things like for(;;) statements work better.) */ | |
c906108c | 5245 | |
16c381f0 JK |
5246 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
5247 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
edb3359d | 5248 | set_step_info (frame, stop_pc_sal); |
488f131b | 5249 | |
527159b7 | 5250 | if (debug_infrun) |
8a9de0e4 | 5251 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 5252 | keep_going (ecs); |
104c1213 JM |
5253 | } |
5254 | ||
b3444185 | 5255 | /* Is thread TP in the middle of single-stepping? */ |
104c1213 | 5256 | |
a289b8f6 | 5257 | static int |
b3444185 | 5258 | currently_stepping (struct thread_info *tp) |
a7212384 | 5259 | { |
8358c15c JK |
5260 | return ((tp->control.step_range_end |
5261 | && tp->control.step_resume_breakpoint == NULL) | |
5262 | || tp->control.trap_expected | |
8358c15c | 5263 | || bpstat_should_step ()); |
a7212384 UW |
5264 | } |
5265 | ||
b3444185 PA |
5266 | /* Returns true if any thread *but* the one passed in "data" is in the |
5267 | middle of stepping or of handling a "next". */ | |
a7212384 | 5268 | |
104c1213 | 5269 | static int |
b3444185 | 5270 | currently_stepping_or_nexting_callback (struct thread_info *tp, void *data) |
104c1213 | 5271 | { |
b3444185 PA |
5272 | if (tp == data) |
5273 | return 0; | |
5274 | ||
16c381f0 | 5275 | return (tp->control.step_range_end |
ede1849f | 5276 | || tp->control.trap_expected); |
104c1213 | 5277 | } |
c906108c | 5278 | |
b2175913 MS |
5279 | /* Inferior has stepped into a subroutine call with source code that |
5280 | we should not step over. Do step to the first line of code in | |
5281 | it. */ | |
c2c6d25f JM |
5282 | |
5283 | static void | |
568d6575 UW |
5284 | handle_step_into_function (struct gdbarch *gdbarch, |
5285 | struct execution_control_state *ecs) | |
c2c6d25f JM |
5286 | { |
5287 | struct symtab *s; | |
2afb61aa | 5288 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f | 5289 | |
7e324e48 GB |
5290 | fill_in_stop_func (gdbarch, ecs); |
5291 | ||
c2c6d25f JM |
5292 | s = find_pc_symtab (stop_pc); |
5293 | if (s && s->language != language_asm) | |
568d6575 | 5294 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 | 5295 | ecs->stop_func_start); |
c2c6d25f | 5296 | |
2afb61aa | 5297 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
5298 | /* Use the step_resume_break to step until the end of the prologue, |
5299 | even if that involves jumps (as it seems to on the vax under | |
5300 | 4.2). */ | |
5301 | /* If the prologue ends in the middle of a source line, continue to | |
5302 | the end of that source line (if it is still within the function). | |
5303 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
5304 | if (stop_func_sal.end |
5305 | && stop_func_sal.pc != ecs->stop_func_start | |
5306 | && stop_func_sal.end < ecs->stop_func_end) | |
5307 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 5308 | |
2dbd5e30 KB |
5309 | /* Architectures which require breakpoint adjustment might not be able |
5310 | to place a breakpoint at the computed address. If so, the test | |
5311 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
5312 | ecs->stop_func_start to an address at which a breakpoint may be | |
5313 | legitimately placed. | |
8fb3e588 | 5314 | |
2dbd5e30 KB |
5315 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
5316 | made, GDB will enter an infinite loop when stepping through | |
5317 | optimized code consisting of VLIW instructions which contain | |
5318 | subinstructions corresponding to different source lines. On | |
5319 | FR-V, it's not permitted to place a breakpoint on any but the | |
5320 | first subinstruction of a VLIW instruction. When a breakpoint is | |
5321 | set, GDB will adjust the breakpoint address to the beginning of | |
5322 | the VLIW instruction. Thus, we need to make the corresponding | |
5323 | adjustment here when computing the stop address. */ | |
8fb3e588 | 5324 | |
568d6575 | 5325 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
5326 | { |
5327 | ecs->stop_func_start | |
568d6575 | 5328 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 5329 | ecs->stop_func_start); |
2dbd5e30 KB |
5330 | } |
5331 | ||
c2c6d25f JM |
5332 | if (ecs->stop_func_start == stop_pc) |
5333 | { | |
5334 | /* We are already there: stop now. */ | |
16c381f0 | 5335 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5336 | print_end_stepping_range_reason (); |
c2c6d25f JM |
5337 | stop_stepping (ecs); |
5338 | return; | |
5339 | } | |
5340 | else | |
5341 | { | |
5342 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 5343 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
5344 | sr_sal.pc = ecs->stop_func_start; |
5345 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 5346 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 5347 | |
c2c6d25f | 5348 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
5349 | some machines the prologue is where the new fp value is |
5350 | established. */ | |
a6d9a66e | 5351 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
5352 | |
5353 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
5354 | ecs->event_thread->control.step_range_end |
5355 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
5356 | } |
5357 | keep_going (ecs); | |
5358 | } | |
d4f3574e | 5359 | |
b2175913 MS |
5360 | /* Inferior has stepped backward into a subroutine call with source |
5361 | code that we should not step over. Do step to the beginning of the | |
5362 | last line of code in it. */ | |
5363 | ||
5364 | static void | |
568d6575 UW |
5365 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
5366 | struct execution_control_state *ecs) | |
b2175913 MS |
5367 | { |
5368 | struct symtab *s; | |
167e4384 | 5369 | struct symtab_and_line stop_func_sal; |
b2175913 | 5370 | |
7e324e48 GB |
5371 | fill_in_stop_func (gdbarch, ecs); |
5372 | ||
b2175913 MS |
5373 | s = find_pc_symtab (stop_pc); |
5374 | if (s && s->language != language_asm) | |
568d6575 | 5375 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 MS |
5376 | ecs->stop_func_start); |
5377 | ||
5378 | stop_func_sal = find_pc_line (stop_pc, 0); | |
5379 | ||
5380 | /* OK, we're just going to keep stepping here. */ | |
5381 | if (stop_func_sal.pc == stop_pc) | |
5382 | { | |
5383 | /* We're there already. Just stop stepping now. */ | |
16c381f0 | 5384 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5385 | print_end_stepping_range_reason (); |
b2175913 MS |
5386 | stop_stepping (ecs); |
5387 | } | |
5388 | else | |
5389 | { | |
5390 | /* Else just reset the step range and keep going. | |
5391 | No step-resume breakpoint, they don't work for | |
5392 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
5393 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
5394 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
5395 | keep_going (ecs); |
5396 | } | |
5397 | return; | |
5398 | } | |
5399 | ||
d3169d93 | 5400 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
5401 | This is used to both functions and to skip over code. */ |
5402 | ||
5403 | static void | |
2c03e5be PA |
5404 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
5405 | struct symtab_and_line sr_sal, | |
5406 | struct frame_id sr_id, | |
5407 | enum bptype sr_type) | |
44cbf7b5 | 5408 | { |
611c83ae PA |
5409 | /* There should never be more than one step-resume or longjmp-resume |
5410 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 5411 | step_resume_breakpoint when one is already active. */ |
8358c15c | 5412 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 5413 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
5414 | |
5415 | if (debug_infrun) | |
5416 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5417 | "infrun: inserting step-resume breakpoint at %s\n", |
5418 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 5419 | |
8358c15c | 5420 | inferior_thread ()->control.step_resume_breakpoint |
2c03e5be PA |
5421 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type); |
5422 | } | |
5423 | ||
9da8c2a0 | 5424 | void |
2c03e5be PA |
5425 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
5426 | struct symtab_and_line sr_sal, | |
5427 | struct frame_id sr_id) | |
5428 | { | |
5429 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
5430 | sr_sal, sr_id, | |
5431 | bp_step_resume); | |
44cbf7b5 | 5432 | } |
7ce450bd | 5433 | |
2c03e5be PA |
5434 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
5435 | This is used to skip a potential signal handler. | |
7ce450bd | 5436 | |
14e60db5 DJ |
5437 | This is called with the interrupted function's frame. The signal |
5438 | handler, when it returns, will resume the interrupted function at | |
5439 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
5440 | |
5441 | static void | |
2c03e5be | 5442 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
5443 | { |
5444 | struct symtab_and_line sr_sal; | |
a6d9a66e | 5445 | struct gdbarch *gdbarch; |
d303a6c7 | 5446 | |
f4c1edd8 | 5447 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
5448 | init_sal (&sr_sal); /* initialize to zeros */ |
5449 | ||
a6d9a66e | 5450 | gdbarch = get_frame_arch (return_frame); |
568d6575 | 5451 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 5452 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5453 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 5454 | |
2c03e5be PA |
5455 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
5456 | get_stack_frame_id (return_frame), | |
5457 | bp_hp_step_resume); | |
d303a6c7 AC |
5458 | } |
5459 | ||
2c03e5be PA |
5460 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
5461 | is used to skip a function after stepping into it (for "next" or if | |
5462 | the called function has no debugging information). | |
14e60db5 DJ |
5463 | |
5464 | The current function has almost always been reached by single | |
5465 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
5466 | current function, and the breakpoint will be set at the caller's | |
5467 | resume address. | |
5468 | ||
5469 | This is a separate function rather than reusing | |
2c03e5be | 5470 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 5471 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 5472 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
5473 | |
5474 | static void | |
5475 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
5476 | { | |
5477 | struct symtab_and_line sr_sal; | |
a6d9a66e | 5478 | struct gdbarch *gdbarch; |
14e60db5 DJ |
5479 | |
5480 | /* We shouldn't have gotten here if we don't know where the call site | |
5481 | is. */ | |
c7ce8faa | 5482 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 DJ |
5483 | |
5484 | init_sal (&sr_sal); /* initialize to zeros */ | |
5485 | ||
a6d9a66e | 5486 | gdbarch = frame_unwind_caller_arch (next_frame); |
c7ce8faa DJ |
5487 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
5488 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 5489 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5490 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 5491 | |
a6d9a66e | 5492 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 5493 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
5494 | } |
5495 | ||
611c83ae PA |
5496 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
5497 | new breakpoint at the target of a jmp_buf. The handling of | |
5498 | longjmp-resume uses the same mechanisms used for handling | |
5499 | "step-resume" breakpoints. */ | |
5500 | ||
5501 | static void | |
a6d9a66e | 5502 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 5503 | { |
e81a37f7 TT |
5504 | /* There should never be more than one longjmp-resume breakpoint per |
5505 | thread, so we should never be setting a new | |
611c83ae | 5506 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 5507 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
5508 | |
5509 | if (debug_infrun) | |
5510 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5511 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
5512 | paddress (gdbarch, pc)); | |
611c83ae | 5513 | |
e81a37f7 | 5514 | inferior_thread ()->control.exception_resume_breakpoint = |
a6d9a66e | 5515 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); |
611c83ae PA |
5516 | } |
5517 | ||
186c406b TT |
5518 | /* Insert an exception resume breakpoint. TP is the thread throwing |
5519 | the exception. The block B is the block of the unwinder debug hook | |
5520 | function. FRAME is the frame corresponding to the call to this | |
5521 | function. SYM is the symbol of the function argument holding the | |
5522 | target PC of the exception. */ | |
5523 | ||
5524 | static void | |
5525 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
5526 | struct block *b, | |
5527 | struct frame_info *frame, | |
5528 | struct symbol *sym) | |
5529 | { | |
bfd189b1 | 5530 | volatile struct gdb_exception e; |
186c406b TT |
5531 | |
5532 | /* We want to ignore errors here. */ | |
5533 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
5534 | { | |
5535 | struct symbol *vsym; | |
5536 | struct value *value; | |
5537 | CORE_ADDR handler; | |
5538 | struct breakpoint *bp; | |
5539 | ||
5540 | vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL); | |
5541 | value = read_var_value (vsym, frame); | |
5542 | /* If the value was optimized out, revert to the old behavior. */ | |
5543 | if (! value_optimized_out (value)) | |
5544 | { | |
5545 | handler = value_as_address (value); | |
5546 | ||
5547 | if (debug_infrun) | |
5548 | fprintf_unfiltered (gdb_stdlog, | |
5549 | "infrun: exception resume at %lx\n", | |
5550 | (unsigned long) handler); | |
5551 | ||
5552 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
5553 | handler, bp_exception_resume); | |
c70a6932 JK |
5554 | |
5555 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
5556 | frame = NULL; | |
5557 | ||
186c406b TT |
5558 | bp->thread = tp->num; |
5559 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
5560 | } | |
5561 | } | |
5562 | } | |
5563 | ||
28106bc2 SDJ |
5564 | /* A helper for check_exception_resume that sets an |
5565 | exception-breakpoint based on a SystemTap probe. */ | |
5566 | ||
5567 | static void | |
5568 | insert_exception_resume_from_probe (struct thread_info *tp, | |
5569 | const struct probe *probe, | |
28106bc2 SDJ |
5570 | struct frame_info *frame) |
5571 | { | |
5572 | struct value *arg_value; | |
5573 | CORE_ADDR handler; | |
5574 | struct breakpoint *bp; | |
5575 | ||
5576 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
5577 | if (!arg_value) | |
5578 | return; | |
5579 | ||
5580 | handler = value_as_address (arg_value); | |
5581 | ||
5582 | if (debug_infrun) | |
5583 | fprintf_unfiltered (gdb_stdlog, | |
5584 | "infrun: exception resume at %s\n", | |
6bac7473 | 5585 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
5586 | handler)); |
5587 | ||
5588 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
5589 | handler, bp_exception_resume); | |
5590 | bp->thread = tp->num; | |
5591 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
5592 | } | |
5593 | ||
186c406b TT |
5594 | /* This is called when an exception has been intercepted. Check to |
5595 | see whether the exception's destination is of interest, and if so, | |
5596 | set an exception resume breakpoint there. */ | |
5597 | ||
5598 | static void | |
5599 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 5600 | struct frame_info *frame) |
186c406b | 5601 | { |
bfd189b1 | 5602 | volatile struct gdb_exception e; |
28106bc2 SDJ |
5603 | const struct probe *probe; |
5604 | struct symbol *func; | |
5605 | ||
5606 | /* First see if this exception unwinding breakpoint was set via a | |
5607 | SystemTap probe point. If so, the probe has two arguments: the | |
5608 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
5609 | set a breakpoint there. */ | |
6bac7473 | 5610 | probe = find_probe_by_pc (get_frame_pc (frame)); |
28106bc2 SDJ |
5611 | if (probe) |
5612 | { | |
6bac7473 | 5613 | insert_exception_resume_from_probe (ecs->event_thread, probe, frame); |
28106bc2 SDJ |
5614 | return; |
5615 | } | |
5616 | ||
5617 | func = get_frame_function (frame); | |
5618 | if (!func) | |
5619 | return; | |
186c406b TT |
5620 | |
5621 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
5622 | { | |
5623 | struct block *b; | |
8157b174 | 5624 | struct block_iterator iter; |
186c406b TT |
5625 | struct symbol *sym; |
5626 | int argno = 0; | |
5627 | ||
5628 | /* The exception breakpoint is a thread-specific breakpoint on | |
5629 | the unwinder's debug hook, declared as: | |
5630 | ||
5631 | void _Unwind_DebugHook (void *cfa, void *handler); | |
5632 | ||
5633 | The CFA argument indicates the frame to which control is | |
5634 | about to be transferred. HANDLER is the destination PC. | |
5635 | ||
5636 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
5637 | This is not extremely efficient but it avoids issues in gdb | |
5638 | with computing the DWARF CFA, and it also works even in weird | |
5639 | cases such as throwing an exception from inside a signal | |
5640 | handler. */ | |
5641 | ||
5642 | b = SYMBOL_BLOCK_VALUE (func); | |
5643 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
5644 | { | |
5645 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
5646 | continue; | |
5647 | ||
5648 | if (argno == 0) | |
5649 | ++argno; | |
5650 | else | |
5651 | { | |
5652 | insert_exception_resume_breakpoint (ecs->event_thread, | |
5653 | b, frame, sym); | |
5654 | break; | |
5655 | } | |
5656 | } | |
5657 | } | |
5658 | } | |
5659 | ||
104c1213 JM |
5660 | static void |
5661 | stop_stepping (struct execution_control_state *ecs) | |
5662 | { | |
527159b7 | 5663 | if (debug_infrun) |
8a9de0e4 | 5664 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
527159b7 | 5665 | |
cd0fc7c3 SS |
5666 | /* Let callers know we don't want to wait for the inferior anymore. */ |
5667 | ecs->wait_some_more = 0; | |
5668 | } | |
5669 | ||
d4f3574e SS |
5670 | /* This function handles various cases where we need to continue |
5671 | waiting for the inferior. */ | |
1777feb0 | 5672 | /* (Used to be the keep_going: label in the old wait_for_inferior). */ |
d4f3574e SS |
5673 | |
5674 | static void | |
5675 | keep_going (struct execution_control_state *ecs) | |
5676 | { | |
c4dbc9af PA |
5677 | /* Make sure normal_stop is called if we get a QUIT handled before |
5678 | reaching resume. */ | |
5679 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
5680 | ||
d4f3574e | 5681 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
5682 | ecs->event_thread->prev_pc |
5683 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 5684 | |
d4f3574e SS |
5685 | /* If we did not do break;, it means we should keep running the |
5686 | inferior and not return to debugger. */ | |
5687 | ||
16c381f0 | 5688 | if (ecs->event_thread->control.trap_expected |
a493e3e2 | 5689 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) |
d4f3574e SS |
5690 | { |
5691 | /* We took a signal (which we are supposed to pass through to | |
4e1c45ea PA |
5692 | the inferior, else we'd not get here) and we haven't yet |
5693 | gotten our trap. Simply continue. */ | |
c4dbc9af PA |
5694 | |
5695 | discard_cleanups (old_cleanups); | |
2020b7ab | 5696 | resume (currently_stepping (ecs->event_thread), |
16c381f0 | 5697 | ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
5698 | } |
5699 | else | |
5700 | { | |
5701 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
5702 | anyway (the user asked that this signal be passed to the |
5703 | child) | |
5704 | -- or -- | |
5705 | The signal was SIGTRAP, e.g. it was our signal, but we | |
5706 | decided we should resume from it. | |
d4f3574e | 5707 | |
c36b740a | 5708 | We're going to run this baby now! |
d4f3574e | 5709 | |
c36b740a VP |
5710 | Note that insert_breakpoints won't try to re-insert |
5711 | already inserted breakpoints. Therefore, we don't | |
5712 | care if breakpoints were already inserted, or not. */ | |
5713 | ||
4e1c45ea | 5714 | if (ecs->event_thread->stepping_over_breakpoint) |
45e8c884 | 5715 | { |
9f5a595d | 5716 | struct regcache *thread_regcache = get_thread_regcache (ecs->ptid); |
abbb1732 | 5717 | |
9f5a595d | 5718 | if (!use_displaced_stepping (get_regcache_arch (thread_regcache))) |
237fc4c9 PA |
5719 | /* Since we can't do a displaced step, we have to remove |
5720 | the breakpoint while we step it. To keep things | |
5721 | simple, we remove them all. */ | |
5722 | remove_breakpoints (); | |
45e8c884 VP |
5723 | } |
5724 | else | |
d4f3574e | 5725 | { |
bfd189b1 | 5726 | volatile struct gdb_exception e; |
abbb1732 | 5727 | |
569631c6 UW |
5728 | /* Stop stepping when inserting breakpoints |
5729 | has failed. */ | |
e236ba44 VP |
5730 | TRY_CATCH (e, RETURN_MASK_ERROR) |
5731 | { | |
5732 | insert_breakpoints (); | |
5733 | } | |
5734 | if (e.reason < 0) | |
d4f3574e | 5735 | { |
97bd5475 | 5736 | exception_print (gdb_stderr, e); |
d4f3574e SS |
5737 | stop_stepping (ecs); |
5738 | return; | |
5739 | } | |
d4f3574e SS |
5740 | } |
5741 | ||
16c381f0 JK |
5742 | ecs->event_thread->control.trap_expected |
5743 | = ecs->event_thread->stepping_over_breakpoint; | |
d4f3574e SS |
5744 | |
5745 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
5746 | specifies that such a signal should be delivered to the |
5747 | target program). | |
5748 | ||
5749 | Typically, this would occure when a user is debugging a | |
5750 | target monitor on a simulator: the target monitor sets a | |
5751 | breakpoint; the simulator encounters this break-point and | |
5752 | halts the simulation handing control to GDB; GDB, noteing | |
5753 | that the break-point isn't valid, returns control back to the | |
5754 | simulator; the simulator then delivers the hardware | |
1777feb0 | 5755 | equivalent of a SIGNAL_TRAP to the program being debugged. */ |
488f131b | 5756 | |
a493e3e2 | 5757 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 5758 | && !signal_program[ecs->event_thread->suspend.stop_signal]) |
a493e3e2 | 5759 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
d4f3574e | 5760 | |
c4dbc9af | 5761 | discard_cleanups (old_cleanups); |
2020b7ab | 5762 | resume (currently_stepping (ecs->event_thread), |
16c381f0 | 5763 | ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
5764 | } |
5765 | ||
488f131b | 5766 | prepare_to_wait (ecs); |
d4f3574e SS |
5767 | } |
5768 | ||
104c1213 JM |
5769 | /* This function normally comes after a resume, before |
5770 | handle_inferior_event exits. It takes care of any last bits of | |
5771 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 5772 | |
104c1213 JM |
5773 | static void |
5774 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 5775 | { |
527159b7 | 5776 | if (debug_infrun) |
8a9de0e4 | 5777 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 5778 | |
104c1213 JM |
5779 | /* This is the old end of the while loop. Let everybody know we |
5780 | want to wait for the inferior some more and get called again | |
5781 | soon. */ | |
5782 | ecs->wait_some_more = 1; | |
c906108c | 5783 | } |
11cf8741 | 5784 | |
33d62d64 JK |
5785 | /* Several print_*_reason functions to print why the inferior has stopped. |
5786 | We always print something when the inferior exits, or receives a signal. | |
5787 | The rest of the cases are dealt with later on in normal_stop and | |
5788 | print_it_typical. Ideally there should be a call to one of these | |
5789 | print_*_reason functions functions from handle_inferior_event each time | |
5790 | stop_stepping is called. */ | |
5791 | ||
5792 | /* Print why the inferior has stopped. | |
5793 | We are done with a step/next/si/ni command, print why the inferior has | |
5794 | stopped. For now print nothing. Print a message only if not in the middle | |
5795 | of doing a "step n" operation for n > 1. */ | |
5796 | ||
5797 | static void | |
5798 | print_end_stepping_range_reason (void) | |
5799 | { | |
16c381f0 JK |
5800 | if ((!inferior_thread ()->step_multi |
5801 | || !inferior_thread ()->control.stop_step) | |
79a45e25 PA |
5802 | && ui_out_is_mi_like_p (current_uiout)) |
5803 | ui_out_field_string (current_uiout, "reason", | |
33d62d64 JK |
5804 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
5805 | } | |
5806 | ||
5807 | /* The inferior was terminated by a signal, print why it stopped. */ | |
5808 | ||
11cf8741 | 5809 | static void |
2ea28649 | 5810 | print_signal_exited_reason (enum gdb_signal siggnal) |
11cf8741 | 5811 | { |
79a45e25 PA |
5812 | struct ui_out *uiout = current_uiout; |
5813 | ||
33d62d64 JK |
5814 | annotate_signalled (); |
5815 | if (ui_out_is_mi_like_p (uiout)) | |
5816 | ui_out_field_string | |
5817 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
5818 | ui_out_text (uiout, "\nProgram terminated with signal "); | |
5819 | annotate_signal_name (); | |
5820 | ui_out_field_string (uiout, "signal-name", | |
2ea28649 | 5821 | gdb_signal_to_name (siggnal)); |
33d62d64 JK |
5822 | annotate_signal_name_end (); |
5823 | ui_out_text (uiout, ", "); | |
5824 | annotate_signal_string (); | |
5825 | ui_out_field_string (uiout, "signal-meaning", | |
2ea28649 | 5826 | gdb_signal_to_string (siggnal)); |
33d62d64 JK |
5827 | annotate_signal_string_end (); |
5828 | ui_out_text (uiout, ".\n"); | |
5829 | ui_out_text (uiout, "The program no longer exists.\n"); | |
5830 | } | |
5831 | ||
5832 | /* The inferior program is finished, print why it stopped. */ | |
5833 | ||
5834 | static void | |
5835 | print_exited_reason (int exitstatus) | |
5836 | { | |
fda326dd TT |
5837 | struct inferior *inf = current_inferior (); |
5838 | const char *pidstr = target_pid_to_str (pid_to_ptid (inf->pid)); | |
79a45e25 | 5839 | struct ui_out *uiout = current_uiout; |
fda326dd | 5840 | |
33d62d64 JK |
5841 | annotate_exited (exitstatus); |
5842 | if (exitstatus) | |
5843 | { | |
5844 | if (ui_out_is_mi_like_p (uiout)) | |
5845 | ui_out_field_string (uiout, "reason", | |
5846 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
fda326dd TT |
5847 | ui_out_text (uiout, "[Inferior "); |
5848 | ui_out_text (uiout, plongest (inf->num)); | |
5849 | ui_out_text (uiout, " ("); | |
5850 | ui_out_text (uiout, pidstr); | |
5851 | ui_out_text (uiout, ") exited with code "); | |
33d62d64 | 5852 | ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) exitstatus); |
fda326dd | 5853 | ui_out_text (uiout, "]\n"); |
33d62d64 JK |
5854 | } |
5855 | else | |
11cf8741 | 5856 | { |
9dc5e2a9 | 5857 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f | 5858 | ui_out_field_string |
33d62d64 | 5859 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); |
fda326dd TT |
5860 | ui_out_text (uiout, "[Inferior "); |
5861 | ui_out_text (uiout, plongest (inf->num)); | |
5862 | ui_out_text (uiout, " ("); | |
5863 | ui_out_text (uiout, pidstr); | |
5864 | ui_out_text (uiout, ") exited normally]\n"); | |
33d62d64 JK |
5865 | } |
5866 | /* Support the --return-child-result option. */ | |
5867 | return_child_result_value = exitstatus; | |
5868 | } | |
5869 | ||
5870 | /* Signal received, print why the inferior has stopped. The signal table | |
1777feb0 | 5871 | tells us to print about it. */ |
33d62d64 JK |
5872 | |
5873 | static void | |
2ea28649 | 5874 | print_signal_received_reason (enum gdb_signal siggnal) |
33d62d64 | 5875 | { |
79a45e25 PA |
5876 | struct ui_out *uiout = current_uiout; |
5877 | ||
33d62d64 JK |
5878 | annotate_signal (); |
5879 | ||
a493e3e2 | 5880 | if (siggnal == GDB_SIGNAL_0 && !ui_out_is_mi_like_p (uiout)) |
33d62d64 JK |
5881 | { |
5882 | struct thread_info *t = inferior_thread (); | |
5883 | ||
5884 | ui_out_text (uiout, "\n["); | |
5885 | ui_out_field_string (uiout, "thread-name", | |
5886 | target_pid_to_str (t->ptid)); | |
5887 | ui_out_field_fmt (uiout, "thread-id", "] #%d", t->num); | |
5888 | ui_out_text (uiout, " stopped"); | |
5889 | } | |
5890 | else | |
5891 | { | |
5892 | ui_out_text (uiout, "\nProgram received signal "); | |
8b93c638 | 5893 | annotate_signal_name (); |
33d62d64 JK |
5894 | if (ui_out_is_mi_like_p (uiout)) |
5895 | ui_out_field_string | |
5896 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b | 5897 | ui_out_field_string (uiout, "signal-name", |
2ea28649 | 5898 | gdb_signal_to_name (siggnal)); |
8b93c638 JM |
5899 | annotate_signal_name_end (); |
5900 | ui_out_text (uiout, ", "); | |
5901 | annotate_signal_string (); | |
488f131b | 5902 | ui_out_field_string (uiout, "signal-meaning", |
2ea28649 | 5903 | gdb_signal_to_string (siggnal)); |
8b93c638 | 5904 | annotate_signal_string_end (); |
33d62d64 JK |
5905 | } |
5906 | ui_out_text (uiout, ".\n"); | |
5907 | } | |
252fbfc8 | 5908 | |
33d62d64 JK |
5909 | /* Reverse execution: target ran out of history info, print why the inferior |
5910 | has stopped. */ | |
252fbfc8 | 5911 | |
33d62d64 JK |
5912 | static void |
5913 | print_no_history_reason (void) | |
5914 | { | |
79a45e25 | 5915 | ui_out_text (current_uiout, "\nNo more reverse-execution history.\n"); |
11cf8741 | 5916 | } |
43ff13b4 | 5917 | |
c906108c SS |
5918 | /* Here to return control to GDB when the inferior stops for real. |
5919 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
5920 | ||
5921 | STOP_PRINT_FRAME nonzero means print the executing frame | |
5922 | (pc, function, args, file, line number and line text). | |
5923 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
5924 | attempting to insert breakpoints. */ | |
5925 | ||
5926 | void | |
96baa820 | 5927 | normal_stop (void) |
c906108c | 5928 | { |
73b65bb0 DJ |
5929 | struct target_waitstatus last; |
5930 | ptid_t last_ptid; | |
29f49a6a | 5931 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
73b65bb0 DJ |
5932 | |
5933 | get_last_target_status (&last_ptid, &last); | |
5934 | ||
29f49a6a PA |
5935 | /* If an exception is thrown from this point on, make sure to |
5936 | propagate GDB's knowledge of the executing state to the | |
5937 | frontend/user running state. A QUIT is an easy exception to see | |
5938 | here, so do this before any filtered output. */ | |
c35b1492 PA |
5939 | if (!non_stop) |
5940 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
5941 | else if (last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
5942 | && last.kind != TARGET_WAITKIND_EXITED |
5943 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c35b1492 | 5944 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); |
29f49a6a | 5945 | |
4f8d22e3 PA |
5946 | /* In non-stop mode, we don't want GDB to switch threads behind the |
5947 | user's back, to avoid races where the user is typing a command to | |
5948 | apply to thread x, but GDB switches to thread y before the user | |
5949 | finishes entering the command. */ | |
5950 | ||
c906108c SS |
5951 | /* As with the notification of thread events, we want to delay |
5952 | notifying the user that we've switched thread context until | |
5953 | the inferior actually stops. | |
5954 | ||
73b65bb0 DJ |
5955 | There's no point in saying anything if the inferior has exited. |
5956 | Note that SIGNALLED here means "exited with a signal", not | |
5957 | "received a signal". */ | |
4f8d22e3 PA |
5958 | if (!non_stop |
5959 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
5960 | && target_has_execution |
5961 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
5962 | && last.kind != TARGET_WAITKIND_EXITED |
5963 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c SS |
5964 | { |
5965 | target_terminal_ours_for_output (); | |
a3f17187 | 5966 | printf_filtered (_("[Switching to %s]\n"), |
c95310c6 | 5967 | target_pid_to_str (inferior_ptid)); |
b8fa951a | 5968 | annotate_thread_changed (); |
39f77062 | 5969 | previous_inferior_ptid = inferior_ptid; |
c906108c | 5970 | } |
c906108c | 5971 | |
0e5bf2a8 PA |
5972 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
5973 | { | |
5974 | gdb_assert (sync_execution || !target_can_async_p ()); | |
5975 | ||
5976 | target_terminal_ours_for_output (); | |
5977 | printf_filtered (_("No unwaited-for children left.\n")); | |
5978 | } | |
5979 | ||
74960c60 | 5980 | if (!breakpoints_always_inserted_mode () && target_has_execution) |
c906108c SS |
5981 | { |
5982 | if (remove_breakpoints ()) | |
5983 | { | |
5984 | target_terminal_ours_for_output (); | |
3e43a32a MS |
5985 | printf_filtered (_("Cannot remove breakpoints because " |
5986 | "program is no longer writable.\nFurther " | |
5987 | "execution is probably impossible.\n")); | |
c906108c SS |
5988 | } |
5989 | } | |
c906108c | 5990 | |
c906108c SS |
5991 | /* If an auto-display called a function and that got a signal, |
5992 | delete that auto-display to avoid an infinite recursion. */ | |
5993 | ||
5994 | if (stopped_by_random_signal) | |
5995 | disable_current_display (); | |
5996 | ||
5997 | /* Don't print a message if in the middle of doing a "step n" | |
5998 | operation for n > 1 */ | |
af679fd0 PA |
5999 | if (target_has_execution |
6000 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
6001 | && last.kind != TARGET_WAITKIND_EXITED | |
6002 | && inferior_thread ()->step_multi | |
16c381f0 | 6003 | && inferior_thread ()->control.stop_step) |
c906108c SS |
6004 | goto done; |
6005 | ||
6006 | target_terminal_ours (); | |
0f641c01 | 6007 | async_enable_stdin (); |
c906108c | 6008 | |
7abfe014 DJ |
6009 | /* Set the current source location. This will also happen if we |
6010 | display the frame below, but the current SAL will be incorrect | |
6011 | during a user hook-stop function. */ | |
d729566a | 6012 | if (has_stack_frames () && !stop_stack_dummy) |
7abfe014 DJ |
6013 | set_current_sal_from_frame (get_current_frame (), 1); |
6014 | ||
dd7e2d2b PA |
6015 | /* Let the user/frontend see the threads as stopped. */ |
6016 | do_cleanups (old_chain); | |
6017 | ||
6018 | /* Look up the hook_stop and run it (CLI internally handles problem | |
6019 | of stop_command's pre-hook not existing). */ | |
6020 | if (stop_command) | |
6021 | catch_errors (hook_stop_stub, stop_command, | |
6022 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
6023 | ||
d729566a | 6024 | if (!has_stack_frames ()) |
d51fd4c8 | 6025 | goto done; |
c906108c | 6026 | |
32400beb PA |
6027 | if (last.kind == TARGET_WAITKIND_SIGNALLED |
6028 | || last.kind == TARGET_WAITKIND_EXITED) | |
6029 | goto done; | |
6030 | ||
c906108c SS |
6031 | /* Select innermost stack frame - i.e., current frame is frame 0, |
6032 | and current location is based on that. | |
6033 | Don't do this on return from a stack dummy routine, | |
1777feb0 | 6034 | or if the program has exited. */ |
c906108c SS |
6035 | |
6036 | if (!stop_stack_dummy) | |
6037 | { | |
0f7d239c | 6038 | select_frame (get_current_frame ()); |
c906108c SS |
6039 | |
6040 | /* Print current location without a level number, if | |
c5aa993b JM |
6041 | we have changed functions or hit a breakpoint. |
6042 | Print source line if we have one. | |
6043 | bpstat_print() contains the logic deciding in detail | |
1777feb0 | 6044 | what to print, based on the event(s) that just occurred. */ |
c906108c | 6045 | |
d01a8610 AS |
6046 | /* If --batch-silent is enabled then there's no need to print the current |
6047 | source location, and to try risks causing an error message about | |
6048 | missing source files. */ | |
6049 | if (stop_print_frame && !batch_silent) | |
c906108c SS |
6050 | { |
6051 | int bpstat_ret; | |
6052 | int source_flag; | |
917317f4 | 6053 | int do_frame_printing = 1; |
347bddb7 | 6054 | struct thread_info *tp = inferior_thread (); |
c906108c | 6055 | |
36dfb11c | 6056 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, last.kind); |
917317f4 JM |
6057 | switch (bpstat_ret) |
6058 | { | |
6059 | case PRINT_UNKNOWN: | |
aa0cd9c1 | 6060 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
6061 | (or should) carry around the function and does (or |
6062 | should) use that when doing a frame comparison. */ | |
16c381f0 JK |
6063 | if (tp->control.stop_step |
6064 | && frame_id_eq (tp->control.step_frame_id, | |
aa0cd9c1 | 6065 | get_frame_id (get_current_frame ())) |
917317f4 | 6066 | && step_start_function == find_pc_function (stop_pc)) |
1777feb0 MS |
6067 | source_flag = SRC_LINE; /* Finished step, just |
6068 | print source line. */ | |
917317f4 | 6069 | else |
1777feb0 MS |
6070 | source_flag = SRC_AND_LOC; /* Print location and |
6071 | source line. */ | |
917317f4 JM |
6072 | break; |
6073 | case PRINT_SRC_AND_LOC: | |
1777feb0 MS |
6074 | source_flag = SRC_AND_LOC; /* Print location and |
6075 | source line. */ | |
917317f4 JM |
6076 | break; |
6077 | case PRINT_SRC_ONLY: | |
c5394b80 | 6078 | source_flag = SRC_LINE; |
917317f4 JM |
6079 | break; |
6080 | case PRINT_NOTHING: | |
488f131b | 6081 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
6082 | do_frame_printing = 0; |
6083 | break; | |
6084 | default: | |
e2e0b3e5 | 6085 | internal_error (__FILE__, __LINE__, _("Unknown value.")); |
917317f4 | 6086 | } |
c906108c SS |
6087 | |
6088 | /* The behavior of this routine with respect to the source | |
6089 | flag is: | |
c5394b80 JM |
6090 | SRC_LINE: Print only source line |
6091 | LOCATION: Print only location | |
1777feb0 | 6092 | SRC_AND_LOC: Print location and source line. */ |
917317f4 | 6093 | if (do_frame_printing) |
b04f3ab4 | 6094 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
6095 | |
6096 | /* Display the auto-display expressions. */ | |
6097 | do_displays (); | |
6098 | } | |
6099 | } | |
6100 | ||
6101 | /* Save the function value return registers, if we care. | |
6102 | We might be about to restore their previous contents. */ | |
9da8c2a0 PA |
6103 | if (inferior_thread ()->control.proceed_to_finish |
6104 | && execution_direction != EXEC_REVERSE) | |
d5c31457 UW |
6105 | { |
6106 | /* This should not be necessary. */ | |
6107 | if (stop_registers) | |
6108 | regcache_xfree (stop_registers); | |
6109 | ||
6110 | /* NB: The copy goes through to the target picking up the value of | |
6111 | all the registers. */ | |
6112 | stop_registers = regcache_dup (get_current_regcache ()); | |
6113 | } | |
c906108c | 6114 | |
aa7d318d | 6115 | if (stop_stack_dummy == STOP_STACK_DUMMY) |
c906108c | 6116 | { |
b89667eb DE |
6117 | /* Pop the empty frame that contains the stack dummy. |
6118 | This also restores inferior state prior to the call | |
16c381f0 | 6119 | (struct infcall_suspend_state). */ |
b89667eb | 6120 | struct frame_info *frame = get_current_frame (); |
abbb1732 | 6121 | |
b89667eb DE |
6122 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); |
6123 | frame_pop (frame); | |
3e43a32a MS |
6124 | /* frame_pop() calls reinit_frame_cache as the last thing it |
6125 | does which means there's currently no selected frame. We | |
6126 | don't need to re-establish a selected frame if the dummy call | |
6127 | returns normally, that will be done by | |
6128 | restore_infcall_control_state. However, we do have to handle | |
6129 | the case where the dummy call is returning after being | |
6130 | stopped (e.g. the dummy call previously hit a breakpoint). | |
6131 | We can't know which case we have so just always re-establish | |
6132 | a selected frame here. */ | |
0f7d239c | 6133 | select_frame (get_current_frame ()); |
c906108c SS |
6134 | } |
6135 | ||
c906108c SS |
6136 | done: |
6137 | annotate_stopped (); | |
41d2bdb4 PA |
6138 | |
6139 | /* Suppress the stop observer if we're in the middle of: | |
6140 | ||
6141 | - a step n (n > 1), as there still more steps to be done. | |
6142 | ||
6143 | - a "finish" command, as the observer will be called in | |
6144 | finish_command_continuation, so it can include the inferior | |
6145 | function's return value. | |
6146 | ||
6147 | - calling an inferior function, as we pretend we inferior didn't | |
6148 | run at all. The return value of the call is handled by the | |
6149 | expression evaluator, through call_function_by_hand. */ | |
6150 | ||
6151 | if (!target_has_execution | |
6152 | || last.kind == TARGET_WAITKIND_SIGNALLED | |
6153 | || last.kind == TARGET_WAITKIND_EXITED | |
0e5bf2a8 | 6154 | || last.kind == TARGET_WAITKIND_NO_RESUMED |
2ca0b532 PA |
6155 | || (!(inferior_thread ()->step_multi |
6156 | && inferior_thread ()->control.stop_step) | |
16c381f0 JK |
6157 | && !(inferior_thread ()->control.stop_bpstat |
6158 | && inferior_thread ()->control.proceed_to_finish) | |
6159 | && !inferior_thread ()->control.in_infcall)) | |
347bddb7 PA |
6160 | { |
6161 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
16c381f0 | 6162 | observer_notify_normal_stop (inferior_thread ()->control.stop_bpstat, |
1d33d6ba | 6163 | stop_print_frame); |
347bddb7 | 6164 | else |
1d33d6ba | 6165 | observer_notify_normal_stop (NULL, stop_print_frame); |
347bddb7 | 6166 | } |
347bddb7 | 6167 | |
48844aa6 PA |
6168 | if (target_has_execution) |
6169 | { | |
6170 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
6171 | && last.kind != TARGET_WAITKIND_EXITED) | |
6172 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
6173 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 6174 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 6175 | } |
6c95b8df PA |
6176 | |
6177 | /* Try to get rid of automatically added inferiors that are no | |
6178 | longer needed. Keeping those around slows down things linearly. | |
6179 | Note that this never removes the current inferior. */ | |
6180 | prune_inferiors (); | |
c906108c SS |
6181 | } |
6182 | ||
6183 | static int | |
96baa820 | 6184 | hook_stop_stub (void *cmd) |
c906108c | 6185 | { |
5913bcb0 | 6186 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
6187 | return (0); |
6188 | } | |
6189 | \f | |
c5aa993b | 6190 | int |
96baa820 | 6191 | signal_stop_state (int signo) |
c906108c | 6192 | { |
d6b48e9c | 6193 | return signal_stop[signo]; |
c906108c SS |
6194 | } |
6195 | ||
c5aa993b | 6196 | int |
96baa820 | 6197 | signal_print_state (int signo) |
c906108c SS |
6198 | { |
6199 | return signal_print[signo]; | |
6200 | } | |
6201 | ||
c5aa993b | 6202 | int |
96baa820 | 6203 | signal_pass_state (int signo) |
c906108c SS |
6204 | { |
6205 | return signal_program[signo]; | |
6206 | } | |
6207 | ||
2455069d UW |
6208 | static void |
6209 | signal_cache_update (int signo) | |
6210 | { | |
6211 | if (signo == -1) | |
6212 | { | |
a493e3e2 | 6213 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
6214 | signal_cache_update (signo); |
6215 | ||
6216 | return; | |
6217 | } | |
6218 | ||
6219 | signal_pass[signo] = (signal_stop[signo] == 0 | |
6220 | && signal_print[signo] == 0 | |
6221 | && signal_program[signo] == 1); | |
6222 | } | |
6223 | ||
488f131b | 6224 | int |
7bda5e4a | 6225 | signal_stop_update (int signo, int state) |
d4f3574e SS |
6226 | { |
6227 | int ret = signal_stop[signo]; | |
abbb1732 | 6228 | |
d4f3574e | 6229 | signal_stop[signo] = state; |
2455069d | 6230 | signal_cache_update (signo); |
d4f3574e SS |
6231 | return ret; |
6232 | } | |
6233 | ||
488f131b | 6234 | int |
7bda5e4a | 6235 | signal_print_update (int signo, int state) |
d4f3574e SS |
6236 | { |
6237 | int ret = signal_print[signo]; | |
abbb1732 | 6238 | |
d4f3574e | 6239 | signal_print[signo] = state; |
2455069d | 6240 | signal_cache_update (signo); |
d4f3574e SS |
6241 | return ret; |
6242 | } | |
6243 | ||
488f131b | 6244 | int |
7bda5e4a | 6245 | signal_pass_update (int signo, int state) |
d4f3574e SS |
6246 | { |
6247 | int ret = signal_program[signo]; | |
abbb1732 | 6248 | |
d4f3574e | 6249 | signal_program[signo] = state; |
2455069d | 6250 | signal_cache_update (signo); |
d4f3574e SS |
6251 | return ret; |
6252 | } | |
6253 | ||
c906108c | 6254 | static void |
96baa820 | 6255 | sig_print_header (void) |
c906108c | 6256 | { |
3e43a32a MS |
6257 | printf_filtered (_("Signal Stop\tPrint\tPass " |
6258 | "to program\tDescription\n")); | |
c906108c SS |
6259 | } |
6260 | ||
6261 | static void | |
2ea28649 | 6262 | sig_print_info (enum gdb_signal oursig) |
c906108c | 6263 | { |
2ea28649 | 6264 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 6265 | int name_padding = 13 - strlen (name); |
96baa820 | 6266 | |
c906108c SS |
6267 | if (name_padding <= 0) |
6268 | name_padding = 0; | |
6269 | ||
6270 | printf_filtered ("%s", name); | |
488f131b | 6271 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
6272 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
6273 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
6274 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 6275 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
6276 | } |
6277 | ||
6278 | /* Specify how various signals in the inferior should be handled. */ | |
6279 | ||
6280 | static void | |
96baa820 | 6281 | handle_command (char *args, int from_tty) |
c906108c SS |
6282 | { |
6283 | char **argv; | |
6284 | int digits, wordlen; | |
6285 | int sigfirst, signum, siglast; | |
2ea28649 | 6286 | enum gdb_signal oursig; |
c906108c SS |
6287 | int allsigs; |
6288 | int nsigs; | |
6289 | unsigned char *sigs; | |
6290 | struct cleanup *old_chain; | |
6291 | ||
6292 | if (args == NULL) | |
6293 | { | |
e2e0b3e5 | 6294 | error_no_arg (_("signal to handle")); |
c906108c SS |
6295 | } |
6296 | ||
1777feb0 | 6297 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 6298 | |
a493e3e2 | 6299 | nsigs = (int) GDB_SIGNAL_LAST; |
c906108c SS |
6300 | sigs = (unsigned char *) alloca (nsigs); |
6301 | memset (sigs, 0, nsigs); | |
6302 | ||
1777feb0 | 6303 | /* Break the command line up into args. */ |
c906108c | 6304 | |
d1a41061 | 6305 | argv = gdb_buildargv (args); |
7a292a7a | 6306 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
6307 | |
6308 | /* Walk through the args, looking for signal oursigs, signal names, and | |
6309 | actions. Signal numbers and signal names may be interspersed with | |
6310 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 6311 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c SS |
6312 | |
6313 | while (*argv != NULL) | |
6314 | { | |
6315 | wordlen = strlen (*argv); | |
6316 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
6317 | {; | |
6318 | } | |
6319 | allsigs = 0; | |
6320 | sigfirst = siglast = -1; | |
6321 | ||
6322 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
6323 | { | |
6324 | /* Apply action to all signals except those used by the | |
1777feb0 | 6325 | debugger. Silently skip those. */ |
c906108c SS |
6326 | allsigs = 1; |
6327 | sigfirst = 0; | |
6328 | siglast = nsigs - 1; | |
6329 | } | |
6330 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
6331 | { | |
6332 | SET_SIGS (nsigs, sigs, signal_stop); | |
6333 | SET_SIGS (nsigs, sigs, signal_print); | |
6334 | } | |
6335 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
6336 | { | |
6337 | UNSET_SIGS (nsigs, sigs, signal_program); | |
6338 | } | |
6339 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
6340 | { | |
6341 | SET_SIGS (nsigs, sigs, signal_print); | |
6342 | } | |
6343 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
6344 | { | |
6345 | SET_SIGS (nsigs, sigs, signal_program); | |
6346 | } | |
6347 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
6348 | { | |
6349 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
6350 | } | |
6351 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
6352 | { | |
6353 | SET_SIGS (nsigs, sigs, signal_program); | |
6354 | } | |
6355 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
6356 | { | |
6357 | UNSET_SIGS (nsigs, sigs, signal_print); | |
6358 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
6359 | } | |
6360 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
6361 | { | |
6362 | UNSET_SIGS (nsigs, sigs, signal_program); | |
6363 | } | |
6364 | else if (digits > 0) | |
6365 | { | |
6366 | /* It is numeric. The numeric signal refers to our own | |
6367 | internal signal numbering from target.h, not to host/target | |
6368 | signal number. This is a feature; users really should be | |
6369 | using symbolic names anyway, and the common ones like | |
6370 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
6371 | ||
6372 | sigfirst = siglast = (int) | |
2ea28649 | 6373 | gdb_signal_from_command (atoi (*argv)); |
c906108c SS |
6374 | if ((*argv)[digits] == '-') |
6375 | { | |
6376 | siglast = (int) | |
2ea28649 | 6377 | gdb_signal_from_command (atoi ((*argv) + digits + 1)); |
c906108c SS |
6378 | } |
6379 | if (sigfirst > siglast) | |
6380 | { | |
1777feb0 | 6381 | /* Bet he didn't figure we'd think of this case... */ |
c906108c SS |
6382 | signum = sigfirst; |
6383 | sigfirst = siglast; | |
6384 | siglast = signum; | |
6385 | } | |
6386 | } | |
6387 | else | |
6388 | { | |
2ea28649 | 6389 | oursig = gdb_signal_from_name (*argv); |
a493e3e2 | 6390 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
6391 | { |
6392 | sigfirst = siglast = (int) oursig; | |
6393 | } | |
6394 | else | |
6395 | { | |
6396 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 6397 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
6398 | } |
6399 | } | |
6400 | ||
6401 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 6402 | which signals to apply actions to. */ |
c906108c SS |
6403 | |
6404 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
6405 | { | |
2ea28649 | 6406 | switch ((enum gdb_signal) signum) |
c906108c | 6407 | { |
a493e3e2 PA |
6408 | case GDB_SIGNAL_TRAP: |
6409 | case GDB_SIGNAL_INT: | |
c906108c SS |
6410 | if (!allsigs && !sigs[signum]) |
6411 | { | |
9e2f0ad4 | 6412 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 6413 | Are you sure you want to change it? "), |
2ea28649 | 6414 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
6415 | { |
6416 | sigs[signum] = 1; | |
6417 | } | |
6418 | else | |
6419 | { | |
a3f17187 | 6420 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
6421 | gdb_flush (gdb_stdout); |
6422 | } | |
6423 | } | |
6424 | break; | |
a493e3e2 PA |
6425 | case GDB_SIGNAL_0: |
6426 | case GDB_SIGNAL_DEFAULT: | |
6427 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
6428 | /* Make sure that "all" doesn't print these. */ |
6429 | break; | |
6430 | default: | |
6431 | sigs[signum] = 1; | |
6432 | break; | |
6433 | } | |
6434 | } | |
6435 | ||
6436 | argv++; | |
6437 | } | |
6438 | ||
3a031f65 PA |
6439 | for (signum = 0; signum < nsigs; signum++) |
6440 | if (sigs[signum]) | |
6441 | { | |
2455069d | 6442 | signal_cache_update (-1); |
a493e3e2 PA |
6443 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); |
6444 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); | |
c906108c | 6445 | |
3a031f65 PA |
6446 | if (from_tty) |
6447 | { | |
6448 | /* Show the results. */ | |
6449 | sig_print_header (); | |
6450 | for (; signum < nsigs; signum++) | |
6451 | if (sigs[signum]) | |
6452 | sig_print_info (signum); | |
6453 | } | |
6454 | ||
6455 | break; | |
6456 | } | |
c906108c SS |
6457 | |
6458 | do_cleanups (old_chain); | |
6459 | } | |
6460 | ||
de0bea00 MF |
6461 | /* Complete the "handle" command. */ |
6462 | ||
6463 | static VEC (char_ptr) * | |
6464 | handle_completer (struct cmd_list_element *ignore, | |
6465 | char *text, char *word) | |
6466 | { | |
6467 | VEC (char_ptr) *vec_signals, *vec_keywords, *return_val; | |
6468 | static const char * const keywords[] = | |
6469 | { | |
6470 | "all", | |
6471 | "stop", | |
6472 | "ignore", | |
6473 | "print", | |
6474 | "pass", | |
6475 | "nostop", | |
6476 | "noignore", | |
6477 | "noprint", | |
6478 | "nopass", | |
6479 | NULL, | |
6480 | }; | |
6481 | ||
6482 | vec_signals = signal_completer (ignore, text, word); | |
6483 | vec_keywords = complete_on_enum (keywords, word, word); | |
6484 | ||
6485 | return_val = VEC_merge (char_ptr, vec_signals, vec_keywords); | |
6486 | VEC_free (char_ptr, vec_signals); | |
6487 | VEC_free (char_ptr, vec_keywords); | |
6488 | return return_val; | |
6489 | } | |
6490 | ||
c906108c | 6491 | static void |
96baa820 | 6492 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
6493 | { |
6494 | char **argv; | |
6495 | struct cleanup *old_chain; | |
6496 | ||
d1a41061 PP |
6497 | if (args == NULL) |
6498 | error_no_arg (_("xdb command")); | |
6499 | ||
1777feb0 | 6500 | /* Break the command line up into args. */ |
c906108c | 6501 | |
d1a41061 | 6502 | argv = gdb_buildargv (args); |
7a292a7a | 6503 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
6504 | if (argv[1] != (char *) NULL) |
6505 | { | |
6506 | char *argBuf; | |
6507 | int bufLen; | |
6508 | ||
6509 | bufLen = strlen (argv[0]) + 20; | |
6510 | argBuf = (char *) xmalloc (bufLen); | |
6511 | if (argBuf) | |
6512 | { | |
6513 | int validFlag = 1; | |
2ea28649 | 6514 | enum gdb_signal oursig; |
c906108c | 6515 | |
2ea28649 | 6516 | oursig = gdb_signal_from_name (argv[0]); |
c906108c SS |
6517 | memset (argBuf, 0, bufLen); |
6518 | if (strcmp (argv[1], "Q") == 0) | |
6519 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
6520 | else | |
6521 | { | |
6522 | if (strcmp (argv[1], "s") == 0) | |
6523 | { | |
6524 | if (!signal_stop[oursig]) | |
6525 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
6526 | else | |
6527 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
6528 | } | |
6529 | else if (strcmp (argv[1], "i") == 0) | |
6530 | { | |
6531 | if (!signal_program[oursig]) | |
6532 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
6533 | else | |
6534 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
6535 | } | |
6536 | else if (strcmp (argv[1], "r") == 0) | |
6537 | { | |
6538 | if (!signal_print[oursig]) | |
6539 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
6540 | else | |
6541 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
6542 | } | |
6543 | else | |
6544 | validFlag = 0; | |
6545 | } | |
6546 | if (validFlag) | |
6547 | handle_command (argBuf, from_tty); | |
6548 | else | |
a3f17187 | 6549 | printf_filtered (_("Invalid signal handling flag.\n")); |
c906108c | 6550 | if (argBuf) |
b8c9b27d | 6551 | xfree (argBuf); |
c906108c SS |
6552 | } |
6553 | } | |
6554 | do_cleanups (old_chain); | |
6555 | } | |
6556 | ||
2ea28649 PA |
6557 | enum gdb_signal |
6558 | gdb_signal_from_command (int num) | |
ed01b82c PA |
6559 | { |
6560 | if (num >= 1 && num <= 15) | |
2ea28649 | 6561 | return (enum gdb_signal) num; |
ed01b82c PA |
6562 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
6563 | Use \"info signals\" for a list of symbolic signals.")); | |
6564 | } | |
6565 | ||
c906108c SS |
6566 | /* Print current contents of the tables set by the handle command. |
6567 | It is possible we should just be printing signals actually used | |
6568 | by the current target (but for things to work right when switching | |
6569 | targets, all signals should be in the signal tables). */ | |
6570 | ||
6571 | static void | |
96baa820 | 6572 | signals_info (char *signum_exp, int from_tty) |
c906108c | 6573 | { |
2ea28649 | 6574 | enum gdb_signal oursig; |
abbb1732 | 6575 | |
c906108c SS |
6576 | sig_print_header (); |
6577 | ||
6578 | if (signum_exp) | |
6579 | { | |
6580 | /* First see if this is a symbol name. */ | |
2ea28649 | 6581 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 6582 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
6583 | { |
6584 | /* No, try numeric. */ | |
6585 | oursig = | |
2ea28649 | 6586 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
6587 | } |
6588 | sig_print_info (oursig); | |
6589 | return; | |
6590 | } | |
6591 | ||
6592 | printf_filtered ("\n"); | |
6593 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
6594 | for (oursig = GDB_SIGNAL_FIRST; |
6595 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 6596 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
6597 | { |
6598 | QUIT; | |
6599 | ||
a493e3e2 PA |
6600 | if (oursig != GDB_SIGNAL_UNKNOWN |
6601 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
6602 | sig_print_info (oursig); |
6603 | } | |
6604 | ||
3e43a32a MS |
6605 | printf_filtered (_("\nUse the \"handle\" command " |
6606 | "to change these tables.\n")); | |
c906108c | 6607 | } |
4aa995e1 | 6608 | |
c709acd1 PA |
6609 | /* Check if it makes sense to read $_siginfo from the current thread |
6610 | at this point. If not, throw an error. */ | |
6611 | ||
6612 | static void | |
6613 | validate_siginfo_access (void) | |
6614 | { | |
6615 | /* No current inferior, no siginfo. */ | |
6616 | if (ptid_equal (inferior_ptid, null_ptid)) | |
6617 | error (_("No thread selected.")); | |
6618 | ||
6619 | /* Don't try to read from a dead thread. */ | |
6620 | if (is_exited (inferior_ptid)) | |
6621 | error (_("The current thread has terminated")); | |
6622 | ||
6623 | /* ... or from a spinning thread. */ | |
6624 | if (is_running (inferior_ptid)) | |
6625 | error (_("Selected thread is running.")); | |
6626 | } | |
6627 | ||
4aa995e1 PA |
6628 | /* The $_siginfo convenience variable is a bit special. We don't know |
6629 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 6630 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
6631 | also dependent on which thread you have selected. |
6632 | ||
6633 | 1. making $_siginfo be an internalvar that creates a new value on | |
6634 | access. | |
6635 | ||
6636 | 2. making the value of $_siginfo be an lval_computed value. */ | |
6637 | ||
6638 | /* This function implements the lval_computed support for reading a | |
6639 | $_siginfo value. */ | |
6640 | ||
6641 | static void | |
6642 | siginfo_value_read (struct value *v) | |
6643 | { | |
6644 | LONGEST transferred; | |
6645 | ||
c709acd1 PA |
6646 | validate_siginfo_access (); |
6647 | ||
4aa995e1 PA |
6648 | transferred = |
6649 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
6650 | NULL, | |
6651 | value_contents_all_raw (v), | |
6652 | value_offset (v), | |
6653 | TYPE_LENGTH (value_type (v))); | |
6654 | ||
6655 | if (transferred != TYPE_LENGTH (value_type (v))) | |
6656 | error (_("Unable to read siginfo")); | |
6657 | } | |
6658 | ||
6659 | /* This function implements the lval_computed support for writing a | |
6660 | $_siginfo value. */ | |
6661 | ||
6662 | static void | |
6663 | siginfo_value_write (struct value *v, struct value *fromval) | |
6664 | { | |
6665 | LONGEST transferred; | |
6666 | ||
c709acd1 PA |
6667 | validate_siginfo_access (); |
6668 | ||
4aa995e1 PA |
6669 | transferred = target_write (¤t_target, |
6670 | TARGET_OBJECT_SIGNAL_INFO, | |
6671 | NULL, | |
6672 | value_contents_all_raw (fromval), | |
6673 | value_offset (v), | |
6674 | TYPE_LENGTH (value_type (fromval))); | |
6675 | ||
6676 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
6677 | error (_("Unable to write siginfo")); | |
6678 | } | |
6679 | ||
c8f2448a | 6680 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
6681 | { |
6682 | siginfo_value_read, | |
6683 | siginfo_value_write | |
6684 | }; | |
6685 | ||
6686 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
6687 | the current thread using architecture GDBARCH. Return a void value |
6688 | if there's no object available. */ | |
4aa995e1 | 6689 | |
2c0b251b | 6690 | static struct value * |
22d2b532 SDJ |
6691 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
6692 | void *ignore) | |
4aa995e1 | 6693 | { |
4aa995e1 | 6694 | if (target_has_stack |
78267919 UW |
6695 | && !ptid_equal (inferior_ptid, null_ptid) |
6696 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
4aa995e1 | 6697 | { |
78267919 | 6698 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 6699 | |
78267919 | 6700 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
6701 | } |
6702 | ||
78267919 | 6703 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
6704 | } |
6705 | ||
c906108c | 6706 | \f |
16c381f0 JK |
6707 | /* infcall_suspend_state contains state about the program itself like its |
6708 | registers and any signal it received when it last stopped. | |
6709 | This state must be restored regardless of how the inferior function call | |
6710 | ends (either successfully, or after it hits a breakpoint or signal) | |
6711 | if the program is to properly continue where it left off. */ | |
6712 | ||
6713 | struct infcall_suspend_state | |
7a292a7a | 6714 | { |
16c381f0 | 6715 | struct thread_suspend_state thread_suspend; |
dd80ea3c | 6716 | #if 0 /* Currently unused and empty structures are not valid C. */ |
16c381f0 | 6717 | struct inferior_suspend_state inferior_suspend; |
dd80ea3c | 6718 | #endif |
16c381f0 JK |
6719 | |
6720 | /* Other fields: */ | |
7a292a7a | 6721 | CORE_ADDR stop_pc; |
b89667eb | 6722 | struct regcache *registers; |
1736ad11 | 6723 | |
35515841 | 6724 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
1736ad11 JK |
6725 | struct gdbarch *siginfo_gdbarch; |
6726 | ||
6727 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
6728 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
6729 | content would be invalid. */ | |
6730 | gdb_byte *siginfo_data; | |
b89667eb DE |
6731 | }; |
6732 | ||
16c381f0 JK |
6733 | struct infcall_suspend_state * |
6734 | save_infcall_suspend_state (void) | |
b89667eb | 6735 | { |
16c381f0 | 6736 | struct infcall_suspend_state *inf_state; |
b89667eb | 6737 | struct thread_info *tp = inferior_thread (); |
16c381f0 | 6738 | struct inferior *inf = current_inferior (); |
1736ad11 JK |
6739 | struct regcache *regcache = get_current_regcache (); |
6740 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
6741 | gdb_byte *siginfo_data = NULL; | |
6742 | ||
6743 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
6744 | { | |
6745 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
6746 | size_t len = TYPE_LENGTH (type); | |
6747 | struct cleanup *back_to; | |
6748 | ||
6749 | siginfo_data = xmalloc (len); | |
6750 | back_to = make_cleanup (xfree, siginfo_data); | |
6751 | ||
6752 | if (target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6753 | siginfo_data, 0, len) == len) | |
6754 | discard_cleanups (back_to); | |
6755 | else | |
6756 | { | |
6757 | /* Errors ignored. */ | |
6758 | do_cleanups (back_to); | |
6759 | siginfo_data = NULL; | |
6760 | } | |
6761 | } | |
6762 | ||
16c381f0 | 6763 | inf_state = XZALLOC (struct infcall_suspend_state); |
1736ad11 JK |
6764 | |
6765 | if (siginfo_data) | |
6766 | { | |
6767 | inf_state->siginfo_gdbarch = gdbarch; | |
6768 | inf_state->siginfo_data = siginfo_data; | |
6769 | } | |
b89667eb | 6770 | |
16c381f0 | 6771 | inf_state->thread_suspend = tp->suspend; |
dd80ea3c | 6772 | #if 0 /* Currently unused and empty structures are not valid C. */ |
16c381f0 | 6773 | inf_state->inferior_suspend = inf->suspend; |
dd80ea3c | 6774 | #endif |
16c381f0 | 6775 | |
35515841 | 6776 | /* run_inferior_call will not use the signal due to its `proceed' call with |
a493e3e2 PA |
6777 | GDB_SIGNAL_0 anyway. */ |
6778 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
35515841 | 6779 | |
b89667eb DE |
6780 | inf_state->stop_pc = stop_pc; |
6781 | ||
1736ad11 | 6782 | inf_state->registers = regcache_dup (regcache); |
b89667eb DE |
6783 | |
6784 | return inf_state; | |
6785 | } | |
6786 | ||
6787 | /* Restore inferior session state to INF_STATE. */ | |
6788 | ||
6789 | void | |
16c381f0 | 6790 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
6791 | { |
6792 | struct thread_info *tp = inferior_thread (); | |
16c381f0 | 6793 | struct inferior *inf = current_inferior (); |
1736ad11 JK |
6794 | struct regcache *regcache = get_current_regcache (); |
6795 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
b89667eb | 6796 | |
16c381f0 | 6797 | tp->suspend = inf_state->thread_suspend; |
dd80ea3c | 6798 | #if 0 /* Currently unused and empty structures are not valid C. */ |
16c381f0 | 6799 | inf->suspend = inf_state->inferior_suspend; |
dd80ea3c | 6800 | #endif |
16c381f0 | 6801 | |
b89667eb DE |
6802 | stop_pc = inf_state->stop_pc; |
6803 | ||
1736ad11 JK |
6804 | if (inf_state->siginfo_gdbarch == gdbarch) |
6805 | { | |
6806 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
1736ad11 JK |
6807 | |
6808 | /* Errors ignored. */ | |
6809 | target_write (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6acef6cd | 6810 | inf_state->siginfo_data, 0, TYPE_LENGTH (type)); |
1736ad11 JK |
6811 | } |
6812 | ||
b89667eb DE |
6813 | /* The inferior can be gone if the user types "print exit(0)" |
6814 | (and perhaps other times). */ | |
6815 | if (target_has_execution) | |
6816 | /* NB: The register write goes through to the target. */ | |
1736ad11 | 6817 | regcache_cpy (regcache, inf_state->registers); |
803b5f95 | 6818 | |
16c381f0 | 6819 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
6820 | } |
6821 | ||
6822 | static void | |
16c381f0 | 6823 | do_restore_infcall_suspend_state_cleanup (void *state) |
b89667eb | 6824 | { |
16c381f0 | 6825 | restore_infcall_suspend_state (state); |
b89667eb DE |
6826 | } |
6827 | ||
6828 | struct cleanup * | |
16c381f0 JK |
6829 | make_cleanup_restore_infcall_suspend_state |
6830 | (struct infcall_suspend_state *inf_state) | |
b89667eb | 6831 | { |
16c381f0 | 6832 | return make_cleanup (do_restore_infcall_suspend_state_cleanup, inf_state); |
b89667eb DE |
6833 | } |
6834 | ||
6835 | void | |
16c381f0 | 6836 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
6837 | { |
6838 | regcache_xfree (inf_state->registers); | |
803b5f95 | 6839 | xfree (inf_state->siginfo_data); |
b89667eb DE |
6840 | xfree (inf_state); |
6841 | } | |
6842 | ||
6843 | struct regcache * | |
16c381f0 | 6844 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb DE |
6845 | { |
6846 | return inf_state->registers; | |
6847 | } | |
6848 | ||
16c381f0 JK |
6849 | /* infcall_control_state contains state regarding gdb's control of the |
6850 | inferior itself like stepping control. It also contains session state like | |
6851 | the user's currently selected frame. */ | |
b89667eb | 6852 | |
16c381f0 | 6853 | struct infcall_control_state |
b89667eb | 6854 | { |
16c381f0 JK |
6855 | struct thread_control_state thread_control; |
6856 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
6857 | |
6858 | /* Other fields: */ | |
6859 | enum stop_stack_kind stop_stack_dummy; | |
6860 | int stopped_by_random_signal; | |
7a292a7a | 6861 | int stop_after_trap; |
7a292a7a | 6862 | |
b89667eb | 6863 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe | 6864 | struct frame_id selected_frame_id; |
7a292a7a SS |
6865 | }; |
6866 | ||
c906108c | 6867 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 6868 | connection. */ |
c906108c | 6869 | |
16c381f0 JK |
6870 | struct infcall_control_state * |
6871 | save_infcall_control_state (void) | |
c906108c | 6872 | { |
16c381f0 | 6873 | struct infcall_control_state *inf_status = xmalloc (sizeof (*inf_status)); |
4e1c45ea | 6874 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 6875 | struct inferior *inf = current_inferior (); |
7a292a7a | 6876 | |
16c381f0 JK |
6877 | inf_status->thread_control = tp->control; |
6878 | inf_status->inferior_control = inf->control; | |
d82142e2 | 6879 | |
8358c15c | 6880 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 6881 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 6882 | |
16c381f0 JK |
6883 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
6884 | chain. If caller's caller is walking the chain, they'll be happier if we | |
6885 | hand them back the original chain when restore_infcall_control_state is | |
6886 | called. */ | |
6887 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
6888 | |
6889 | /* Other fields: */ | |
6890 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
6891 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
6892 | inf_status->stop_after_trap = stop_after_trap; | |
c5aa993b | 6893 | |
206415a3 | 6894 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 6895 | |
7a292a7a | 6896 | return inf_status; |
c906108c SS |
6897 | } |
6898 | ||
c906108c | 6899 | static int |
96baa820 | 6900 | restore_selected_frame (void *args) |
c906108c | 6901 | { |
488f131b | 6902 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 6903 | struct frame_info *frame; |
c906108c | 6904 | |
101dcfbe | 6905 | frame = frame_find_by_id (*fid); |
c906108c | 6906 | |
aa0cd9c1 AC |
6907 | /* If inf_status->selected_frame_id is NULL, there was no previously |
6908 | selected frame. */ | |
101dcfbe | 6909 | if (frame == NULL) |
c906108c | 6910 | { |
8a3fe4f8 | 6911 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
6912 | return 0; |
6913 | } | |
6914 | ||
0f7d239c | 6915 | select_frame (frame); |
c906108c SS |
6916 | |
6917 | return (1); | |
6918 | } | |
6919 | ||
b89667eb DE |
6920 | /* Restore inferior session state to INF_STATUS. */ |
6921 | ||
c906108c | 6922 | void |
16c381f0 | 6923 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 6924 | { |
4e1c45ea | 6925 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 6926 | struct inferior *inf = current_inferior (); |
4e1c45ea | 6927 | |
8358c15c JK |
6928 | if (tp->control.step_resume_breakpoint) |
6929 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
6930 | ||
5b79abe7 TT |
6931 | if (tp->control.exception_resume_breakpoint) |
6932 | tp->control.exception_resume_breakpoint->disposition | |
6933 | = disp_del_at_next_stop; | |
6934 | ||
d82142e2 | 6935 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 6936 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 6937 | |
16c381f0 JK |
6938 | tp->control = inf_status->thread_control; |
6939 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
6940 | |
6941 | /* Other fields: */ | |
6942 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
6943 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
6944 | stop_after_trap = inf_status->stop_after_trap; | |
c906108c | 6945 | |
b89667eb | 6946 | if (target_has_stack) |
c906108c | 6947 | { |
c906108c | 6948 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
6949 | walking the stack might encounter a garbage pointer and |
6950 | error() trying to dereference it. */ | |
488f131b JB |
6951 | if (catch_errors |
6952 | (restore_selected_frame, &inf_status->selected_frame_id, | |
6953 | "Unable to restore previously selected frame:\n", | |
6954 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
6955 | /* Error in restoring the selected frame. Select the innermost |
6956 | frame. */ | |
0f7d239c | 6957 | select_frame (get_current_frame ()); |
c906108c | 6958 | } |
c906108c | 6959 | |
72cec141 | 6960 | xfree (inf_status); |
7a292a7a | 6961 | } |
c906108c | 6962 | |
74b7792f | 6963 | static void |
16c381f0 | 6964 | do_restore_infcall_control_state_cleanup (void *sts) |
74b7792f | 6965 | { |
16c381f0 | 6966 | restore_infcall_control_state (sts); |
74b7792f AC |
6967 | } |
6968 | ||
6969 | struct cleanup * | |
16c381f0 JK |
6970 | make_cleanup_restore_infcall_control_state |
6971 | (struct infcall_control_state *inf_status) | |
74b7792f | 6972 | { |
16c381f0 | 6973 | return make_cleanup (do_restore_infcall_control_state_cleanup, inf_status); |
74b7792f AC |
6974 | } |
6975 | ||
c906108c | 6976 | void |
16c381f0 | 6977 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 6978 | { |
8358c15c JK |
6979 | if (inf_status->thread_control.step_resume_breakpoint) |
6980 | inf_status->thread_control.step_resume_breakpoint->disposition | |
6981 | = disp_del_at_next_stop; | |
6982 | ||
5b79abe7 TT |
6983 | if (inf_status->thread_control.exception_resume_breakpoint) |
6984 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
6985 | = disp_del_at_next_stop; | |
6986 | ||
1777feb0 | 6987 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 6988 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 6989 | |
72cec141 | 6990 | xfree (inf_status); |
7a292a7a | 6991 | } |
b89667eb | 6992 | \f |
0723dbf5 PA |
6993 | int |
6994 | ptid_match (ptid_t ptid, ptid_t filter) | |
6995 | { | |
0723dbf5 PA |
6996 | if (ptid_equal (filter, minus_one_ptid)) |
6997 | return 1; | |
6998 | if (ptid_is_pid (filter) | |
6999 | && ptid_get_pid (ptid) == ptid_get_pid (filter)) | |
7000 | return 1; | |
7001 | else if (ptid_equal (ptid, filter)) | |
7002 | return 1; | |
7003 | ||
7004 | return 0; | |
7005 | } | |
7006 | ||
ca6724c1 KB |
7007 | /* restore_inferior_ptid() will be used by the cleanup machinery |
7008 | to restore the inferior_ptid value saved in a call to | |
7009 | save_inferior_ptid(). */ | |
ce696e05 KB |
7010 | |
7011 | static void | |
7012 | restore_inferior_ptid (void *arg) | |
7013 | { | |
7014 | ptid_t *saved_ptid_ptr = arg; | |
abbb1732 | 7015 | |
ce696e05 KB |
7016 | inferior_ptid = *saved_ptid_ptr; |
7017 | xfree (arg); | |
7018 | } | |
7019 | ||
7020 | /* Save the value of inferior_ptid so that it may be restored by a | |
7021 | later call to do_cleanups(). Returns the struct cleanup pointer | |
7022 | needed for later doing the cleanup. */ | |
7023 | ||
7024 | struct cleanup * | |
7025 | save_inferior_ptid (void) | |
7026 | { | |
7027 | ptid_t *saved_ptid_ptr; | |
7028 | ||
7029 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
7030 | *saved_ptid_ptr = inferior_ptid; | |
7031 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
7032 | } | |
c5aa993b | 7033 | \f |
488f131b | 7034 | |
b2175913 MS |
7035 | /* User interface for reverse debugging: |
7036 | Set exec-direction / show exec-direction commands | |
7037 | (returns error unless target implements to_set_exec_direction method). */ | |
7038 | ||
32231432 | 7039 | int execution_direction = EXEC_FORWARD; |
b2175913 MS |
7040 | static const char exec_forward[] = "forward"; |
7041 | static const char exec_reverse[] = "reverse"; | |
7042 | static const char *exec_direction = exec_forward; | |
40478521 | 7043 | static const char *const exec_direction_names[] = { |
b2175913 MS |
7044 | exec_forward, |
7045 | exec_reverse, | |
7046 | NULL | |
7047 | }; | |
7048 | ||
7049 | static void | |
7050 | set_exec_direction_func (char *args, int from_tty, | |
7051 | struct cmd_list_element *cmd) | |
7052 | { | |
7053 | if (target_can_execute_reverse) | |
7054 | { | |
7055 | if (!strcmp (exec_direction, exec_forward)) | |
7056 | execution_direction = EXEC_FORWARD; | |
7057 | else if (!strcmp (exec_direction, exec_reverse)) | |
7058 | execution_direction = EXEC_REVERSE; | |
7059 | } | |
8bbed405 MS |
7060 | else |
7061 | { | |
7062 | exec_direction = exec_forward; | |
7063 | error (_("Target does not support this operation.")); | |
7064 | } | |
b2175913 MS |
7065 | } |
7066 | ||
7067 | static void | |
7068 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
7069 | struct cmd_list_element *cmd, const char *value) | |
7070 | { | |
7071 | switch (execution_direction) { | |
7072 | case EXEC_FORWARD: | |
7073 | fprintf_filtered (out, _("Forward.\n")); | |
7074 | break; | |
7075 | case EXEC_REVERSE: | |
7076 | fprintf_filtered (out, _("Reverse.\n")); | |
7077 | break; | |
b2175913 | 7078 | default: |
d8b34453 PA |
7079 | internal_error (__FILE__, __LINE__, |
7080 | _("bogus execution_direction value: %d"), | |
7081 | (int) execution_direction); | |
b2175913 MS |
7082 | } |
7083 | } | |
7084 | ||
7085 | /* User interface for non-stop mode. */ | |
7086 | ||
ad52ddc6 | 7087 | int non_stop = 0; |
ad52ddc6 PA |
7088 | |
7089 | static void | |
7090 | set_non_stop (char *args, int from_tty, | |
7091 | struct cmd_list_element *c) | |
7092 | { | |
7093 | if (target_has_execution) | |
7094 | { | |
7095 | non_stop_1 = non_stop; | |
7096 | error (_("Cannot change this setting while the inferior is running.")); | |
7097 | } | |
7098 | ||
7099 | non_stop = non_stop_1; | |
7100 | } | |
7101 | ||
7102 | static void | |
7103 | show_non_stop (struct ui_file *file, int from_tty, | |
7104 | struct cmd_list_element *c, const char *value) | |
7105 | { | |
7106 | fprintf_filtered (file, | |
7107 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
7108 | value); | |
7109 | } | |
7110 | ||
d4db2f36 PA |
7111 | static void |
7112 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
7113 | struct cmd_list_element *c, const char *value) | |
7114 | { | |
3e43a32a MS |
7115 | fprintf_filtered (file, _("Resuming the execution of threads " |
7116 | "of all processes is %s.\n"), value); | |
d4db2f36 | 7117 | } |
ad52ddc6 | 7118 | |
22d2b532 SDJ |
7119 | /* Implementation of `siginfo' variable. */ |
7120 | ||
7121 | static const struct internalvar_funcs siginfo_funcs = | |
7122 | { | |
7123 | siginfo_make_value, | |
7124 | NULL, | |
7125 | NULL | |
7126 | }; | |
7127 | ||
c906108c | 7128 | void |
96baa820 | 7129 | _initialize_infrun (void) |
c906108c | 7130 | { |
52f0bd74 AC |
7131 | int i; |
7132 | int numsigs; | |
de0bea00 | 7133 | struct cmd_list_element *c; |
c906108c | 7134 | |
1bedd215 AC |
7135 | add_info ("signals", signals_info, _("\ |
7136 | What debugger does when program gets various signals.\n\ | |
7137 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
7138 | add_info_alias ("handle", "signals", 0); |
7139 | ||
de0bea00 | 7140 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 7141 | Specify how to handle signals.\n\ |
486c7739 | 7142 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 7143 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 7144 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
7145 | will be displayed instead.\n\ |
7146 | \n\ | |
c906108c SS |
7147 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
7148 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
7149 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
7150 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 7151 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 7152 | \n\ |
1bedd215 | 7153 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
7154 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
7155 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
7156 | Print means print a message if this signal happens.\n\ | |
7157 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
7158 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
7159 | Pass and Stop may be combined.\n\ |
7160 | \n\ | |
7161 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
7162 | may be interspersed with actions, with the actions being performed for\n\ | |
7163 | all signals cumulatively specified.")); | |
de0bea00 | 7164 | set_cmd_completer (c, handle_completer); |
486c7739 | 7165 | |
c906108c SS |
7166 | if (xdb_commands) |
7167 | { | |
1bedd215 AC |
7168 | add_com ("lz", class_info, signals_info, _("\ |
7169 | What debugger does when program gets various signals.\n\ | |
7170 | Specify a signal as argument to print info on that signal only.")); | |
7171 | add_com ("z", class_run, xdb_handle_command, _("\ | |
7172 | Specify how to handle a signal.\n\ | |
c906108c SS |
7173 | Args are signals and actions to apply to those signals.\n\ |
7174 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
7175 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
7176 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
7177 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 7178 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
cce7e648 | 7179 | Recognized actions include \"s\" (toggles between stop and nostop),\n\ |
c906108c SS |
7180 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
7181 | nopass), \"Q\" (noprint)\n\ | |
7182 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
7183 | Print means print a message if this signal happens.\n\ | |
7184 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
7185 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 7186 | Pass and Stop may be combined.")); |
c906108c SS |
7187 | } |
7188 | ||
7189 | if (!dbx_commands) | |
1a966eab AC |
7190 | stop_command = add_cmd ("stop", class_obscure, |
7191 | not_just_help_class_command, _("\ | |
7192 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 7193 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 7194 | of the program stops."), &cmdlist); |
c906108c | 7195 | |
ccce17b0 | 7196 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
7197 | Set inferior debugging."), _("\ |
7198 | Show inferior debugging."), _("\ | |
7199 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
7200 | NULL, |
7201 | show_debug_infrun, | |
7202 | &setdebuglist, &showdebuglist); | |
527159b7 | 7203 | |
3e43a32a MS |
7204 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
7205 | &debug_displaced, _("\ | |
237fc4c9 PA |
7206 | Set displaced stepping debugging."), _("\ |
7207 | Show displaced stepping debugging."), _("\ | |
7208 | When non-zero, displaced stepping specific debugging is enabled."), | |
7209 | NULL, | |
7210 | show_debug_displaced, | |
7211 | &setdebuglist, &showdebuglist); | |
7212 | ||
ad52ddc6 PA |
7213 | add_setshow_boolean_cmd ("non-stop", no_class, |
7214 | &non_stop_1, _("\ | |
7215 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
7216 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
7217 | When debugging a multi-threaded program and this setting is\n\ | |
7218 | off (the default, also called all-stop mode), when one thread stops\n\ | |
7219 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
7220 | all other threads in the program while you interact with the thread of\n\ | |
7221 | interest. When you continue or step a thread, you can allow the other\n\ | |
7222 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
7223 | thread's state, all threads stop.\n\ | |
7224 | \n\ | |
7225 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
7226 | to run freely. You'll be able to step each thread independently,\n\ | |
7227 | leave it stopped or free to run as needed."), | |
7228 | set_non_stop, | |
7229 | show_non_stop, | |
7230 | &setlist, | |
7231 | &showlist); | |
7232 | ||
a493e3e2 | 7233 | numsigs = (int) GDB_SIGNAL_LAST; |
488f131b | 7234 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
7235 | signal_print = (unsigned char *) |
7236 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
7237 | signal_program = (unsigned char *) | |
7238 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
2455069d UW |
7239 | signal_pass = (unsigned char *) |
7240 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
c906108c SS |
7241 | for (i = 0; i < numsigs; i++) |
7242 | { | |
7243 | signal_stop[i] = 1; | |
7244 | signal_print[i] = 1; | |
7245 | signal_program[i] = 1; | |
7246 | } | |
7247 | ||
7248 | /* Signals caused by debugger's own actions | |
7249 | should not be given to the program afterwards. */ | |
a493e3e2 PA |
7250 | signal_program[GDB_SIGNAL_TRAP] = 0; |
7251 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
7252 | |
7253 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
7254 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
7255 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
7256 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
7257 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
7258 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
7259 | signal_print[GDB_SIGNAL_PROF] = 0; | |
7260 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
7261 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
7262 | signal_stop[GDB_SIGNAL_IO] = 0; | |
7263 | signal_print[GDB_SIGNAL_IO] = 0; | |
7264 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
7265 | signal_print[GDB_SIGNAL_POLL] = 0; | |
7266 | signal_stop[GDB_SIGNAL_URG] = 0; | |
7267 | signal_print[GDB_SIGNAL_URG] = 0; | |
7268 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
7269 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
7270 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
7271 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 7272 | |
cd0fc7c3 SS |
7273 | /* These signals are used internally by user-level thread |
7274 | implementations. (See signal(5) on Solaris.) Like the above | |
7275 | signals, a healthy program receives and handles them as part of | |
7276 | its normal operation. */ | |
a493e3e2 PA |
7277 | signal_stop[GDB_SIGNAL_LWP] = 0; |
7278 | signal_print[GDB_SIGNAL_LWP] = 0; | |
7279 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
7280 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
7281 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
7282 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
cd0fc7c3 | 7283 | |
2455069d UW |
7284 | /* Update cached state. */ |
7285 | signal_cache_update (-1); | |
7286 | ||
85c07804 AC |
7287 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
7288 | &stop_on_solib_events, _("\ | |
7289 | Set stopping for shared library events."), _("\ | |
7290 | Show stopping for shared library events."), _("\ | |
c906108c SS |
7291 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
7292 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 AC |
7293 | to the user would be loading/unloading of a new library."), |
7294 | NULL, | |
920d2a44 | 7295 | show_stop_on_solib_events, |
85c07804 | 7296 | &setlist, &showlist); |
c906108c | 7297 | |
7ab04401 AC |
7298 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
7299 | follow_fork_mode_kind_names, | |
7300 | &follow_fork_mode_string, _("\ | |
7301 | Set debugger response to a program call of fork or vfork."), _("\ | |
7302 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
7303 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
7304 | parent - the original process is debugged after a fork\n\ | |
7305 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 7306 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
7307 | By default, the debugger will follow the parent process."), |
7308 | NULL, | |
920d2a44 | 7309 | show_follow_fork_mode_string, |
7ab04401 AC |
7310 | &setlist, &showlist); |
7311 | ||
6c95b8df PA |
7312 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
7313 | follow_exec_mode_names, | |
7314 | &follow_exec_mode_string, _("\ | |
7315 | Set debugger response to a program call of exec."), _("\ | |
7316 | Show debugger response to a program call of exec."), _("\ | |
7317 | An exec call replaces the program image of a process.\n\ | |
7318 | \n\ | |
7319 | follow-exec-mode can be:\n\ | |
7320 | \n\ | |
cce7e648 | 7321 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
7322 | to this new inferior. The program the process was running before\n\ |
7323 | the exec call can be restarted afterwards by restarting the original\n\ | |
7324 | inferior.\n\ | |
7325 | \n\ | |
7326 | same - the debugger keeps the process bound to the same inferior.\n\ | |
7327 | The new executable image replaces the previous executable loaded in\n\ | |
7328 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
7329 | the executable the process was running after the exec call.\n\ | |
7330 | \n\ | |
7331 | By default, the debugger will use the same inferior."), | |
7332 | NULL, | |
7333 | show_follow_exec_mode_string, | |
7334 | &setlist, &showlist); | |
7335 | ||
7ab04401 AC |
7336 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
7337 | scheduler_enums, &scheduler_mode, _("\ | |
7338 | Set mode for locking scheduler during execution."), _("\ | |
7339 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
7340 | off == no locking (threads may preempt at any time)\n\ |
7341 | on == full locking (no thread except the current thread may run)\n\ | |
7342 | step == scheduler locked during every single-step operation.\n\ | |
7343 | In this mode, no other thread may run during a step command.\n\ | |
7ab04401 AC |
7344 | Other threads may run while stepping over a function call ('next')."), |
7345 | set_schedlock_func, /* traps on target vector */ | |
920d2a44 | 7346 | show_scheduler_mode, |
7ab04401 | 7347 | &setlist, &showlist); |
5fbbeb29 | 7348 | |
d4db2f36 PA |
7349 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
7350 | Set mode for resuming threads of all processes."), _("\ | |
7351 | Show mode for resuming threads of all processes."), _("\ | |
7352 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
7353 | threads of all processes. When off (which is the default), execution\n\ | |
7354 | commands only resume the threads of the current process. The set of\n\ | |
7355 | threads that are resumed is further refined by the scheduler-locking\n\ | |
7356 | mode (see help set scheduler-locking)."), | |
7357 | NULL, | |
7358 | show_schedule_multiple, | |
7359 | &setlist, &showlist); | |
7360 | ||
5bf193a2 AC |
7361 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
7362 | Set mode of the step operation."), _("\ | |
7363 | Show mode of the step operation."), _("\ | |
7364 | When set, doing a step over a function without debug line information\n\ | |
7365 | will stop at the first instruction of that function. Otherwise, the\n\ | |
7366 | function is skipped and the step command stops at a different source line."), | |
7367 | NULL, | |
920d2a44 | 7368 | show_step_stop_if_no_debug, |
5bf193a2 | 7369 | &setlist, &showlist); |
ca6724c1 | 7370 | |
72d0e2c5 YQ |
7371 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
7372 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
7373 | Set debugger's willingness to use displaced stepping."), _("\ |
7374 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
7375 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
7376 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
7377 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
7378 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
7379 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
7380 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
7381 | NULL, |
7382 | show_can_use_displaced_stepping, | |
7383 | &setlist, &showlist); | |
237fc4c9 | 7384 | |
b2175913 MS |
7385 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
7386 | &exec_direction, _("Set direction of execution.\n\ | |
7387 | Options are 'forward' or 'reverse'."), | |
7388 | _("Show direction of execution (forward/reverse)."), | |
7389 | _("Tells gdb whether to execute forward or backward."), | |
7390 | set_exec_direction_func, show_exec_direction_func, | |
7391 | &setlist, &showlist); | |
7392 | ||
6c95b8df PA |
7393 | /* Set/show detach-on-fork: user-settable mode. */ |
7394 | ||
7395 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
7396 | Set whether gdb will detach the child of a fork."), _("\ | |
7397 | Show whether gdb will detach the child of a fork."), _("\ | |
7398 | Tells gdb whether to detach the child of a fork."), | |
7399 | NULL, NULL, &setlist, &showlist); | |
7400 | ||
03583c20 UW |
7401 | /* Set/show disable address space randomization mode. */ |
7402 | ||
7403 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
7404 | &disable_randomization, _("\ | |
7405 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
7406 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
7407 | When this mode is on (which is the default), randomization of the virtual\n\ | |
7408 | address space is disabled. Standalone programs run with the randomization\n\ | |
7409 | enabled by default on some platforms."), | |
7410 | &set_disable_randomization, | |
7411 | &show_disable_randomization, | |
7412 | &setlist, &showlist); | |
7413 | ||
ca6724c1 | 7414 | /* ptid initializations */ |
ca6724c1 KB |
7415 | inferior_ptid = null_ptid; |
7416 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd PA |
7417 | |
7418 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 7419 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 7420 | observer_attach_thread_exit (infrun_thread_thread_exit); |
fc1cf338 | 7421 | observer_attach_inferior_exit (infrun_inferior_exit); |
4aa995e1 PA |
7422 | |
7423 | /* Explicitly create without lookup, since that tries to create a | |
7424 | value with a void typed value, and when we get here, gdbarch | |
7425 | isn't initialized yet. At this point, we're quite sure there | |
7426 | isn't another convenience variable of the same name. */ | |
22d2b532 | 7427 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
7428 | |
7429 | add_setshow_boolean_cmd ("observer", no_class, | |
7430 | &observer_mode_1, _("\ | |
7431 | Set whether gdb controls the inferior in observer mode."), _("\ | |
7432 | Show whether gdb controls the inferior in observer mode."), _("\ | |
7433 | In observer mode, GDB can get data from the inferior, but not\n\ | |
7434 | affect its execution. Registers and memory may not be changed,\n\ | |
7435 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
7436 | or signalled."), | |
7437 | set_observer_mode, | |
7438 | show_observer_mode, | |
7439 | &setlist, | |
7440 | &showlist); | |
c906108c | 7441 | } |