Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
ecd75fc8 | 4 | Copyright (C) 1986-2014 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" | |
0e9f083f | 22 | #include <string.h> |
c906108c SS |
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" |
d02ed0bb | 52 | #include "record-full.h" |
edb3359d | 53 | #include "inline-frame.h" |
4efc6507 | 54 | #include "jit.h" |
06cd862c | 55 | #include "tracepoint.h" |
be34f849 | 56 | #include "continuations.h" |
b4a14fd0 | 57 | #include "interps.h" |
1bfeeb0f | 58 | #include "skip.h" |
28106bc2 SDJ |
59 | #include "probe.h" |
60 | #include "objfiles.h" | |
de0bea00 | 61 | #include "completer.h" |
9107fc8d | 62 | #include "target-descriptions.h" |
f15cb84a | 63 | #include "target-dcache.h" |
c906108c SS |
64 | |
65 | /* Prototypes for local functions */ | |
66 | ||
96baa820 | 67 | static void signals_info (char *, int); |
c906108c | 68 | |
96baa820 | 69 | static void handle_command (char *, int); |
c906108c | 70 | |
2ea28649 | 71 | static void sig_print_info (enum gdb_signal); |
c906108c | 72 | |
96baa820 | 73 | static void sig_print_header (void); |
c906108c | 74 | |
74b7792f | 75 | static void resume_cleanups (void *); |
c906108c | 76 | |
96baa820 | 77 | static int hook_stop_stub (void *); |
c906108c | 78 | |
96baa820 JM |
79 | static int restore_selected_frame (void *); |
80 | ||
4ef3f3be | 81 | static int follow_fork (void); |
96baa820 JM |
82 | |
83 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 84 | struct cmd_list_element *c); |
96baa820 | 85 | |
a289b8f6 JK |
86 | static int currently_stepping (struct thread_info *tp); |
87 | ||
b3444185 PA |
88 | static int currently_stepping_or_nexting_callback (struct thread_info *tp, |
89 | void *data); | |
a7212384 | 90 | |
96baa820 JM |
91 | static void xdb_handle_command (char *args, int from_tty); |
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 | ||
b9f437de PA |
128 | /* proceed and normal_stop use this to notify the user when the |
129 | inferior stopped in a different thread than it had been running | |
130 | in. */ | |
96baa820 | 131 | |
39f77062 | 132 | static ptid_t previous_inferior_ptid; |
7a292a7a | 133 | |
07107ca6 LM |
134 | /* If set (default for legacy reasons), when following a fork, GDB |
135 | will detach from one of the fork branches, child or parent. | |
136 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
137 | setting. */ | |
138 | ||
139 | static int detach_fork = 1; | |
6c95b8df | 140 | |
237fc4c9 PA |
141 | int debug_displaced = 0; |
142 | static void | |
143 | show_debug_displaced (struct ui_file *file, int from_tty, | |
144 | struct cmd_list_element *c, const char *value) | |
145 | { | |
146 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
147 | } | |
148 | ||
ccce17b0 | 149 | unsigned int debug_infrun = 0; |
920d2a44 AC |
150 | static void |
151 | show_debug_infrun (struct ui_file *file, int from_tty, | |
152 | struct cmd_list_element *c, const char *value) | |
153 | { | |
154 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
155 | } | |
527159b7 | 156 | |
03583c20 UW |
157 | |
158 | /* Support for disabling address space randomization. */ | |
159 | ||
160 | int disable_randomization = 1; | |
161 | ||
162 | static void | |
163 | show_disable_randomization (struct ui_file *file, int from_tty, | |
164 | struct cmd_list_element *c, const char *value) | |
165 | { | |
166 | if (target_supports_disable_randomization ()) | |
167 | fprintf_filtered (file, | |
168 | _("Disabling randomization of debuggee's " | |
169 | "virtual address space is %s.\n"), | |
170 | value); | |
171 | else | |
172 | fputs_filtered (_("Disabling randomization of debuggee's " | |
173 | "virtual address space is unsupported on\n" | |
174 | "this platform.\n"), file); | |
175 | } | |
176 | ||
177 | static void | |
178 | set_disable_randomization (char *args, int from_tty, | |
179 | struct cmd_list_element *c) | |
180 | { | |
181 | if (!target_supports_disable_randomization ()) | |
182 | error (_("Disabling randomization of debuggee's " | |
183 | "virtual address space is unsupported on\n" | |
184 | "this platform.")); | |
185 | } | |
186 | ||
d32dc48e PA |
187 | /* User interface for non-stop mode. */ |
188 | ||
189 | int non_stop = 0; | |
190 | static int non_stop_1 = 0; | |
191 | ||
192 | static void | |
193 | set_non_stop (char *args, int from_tty, | |
194 | struct cmd_list_element *c) | |
195 | { | |
196 | if (target_has_execution) | |
197 | { | |
198 | non_stop_1 = non_stop; | |
199 | error (_("Cannot change this setting while the inferior is running.")); | |
200 | } | |
201 | ||
202 | non_stop = non_stop_1; | |
203 | } | |
204 | ||
205 | static void | |
206 | show_non_stop (struct ui_file *file, int from_tty, | |
207 | struct cmd_list_element *c, const char *value) | |
208 | { | |
209 | fprintf_filtered (file, | |
210 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
211 | value); | |
212 | } | |
213 | ||
d914c394 SS |
214 | /* "Observer mode" is somewhat like a more extreme version of |
215 | non-stop, in which all GDB operations that might affect the | |
216 | target's execution have been disabled. */ | |
217 | ||
d914c394 SS |
218 | int observer_mode = 0; |
219 | static int observer_mode_1 = 0; | |
220 | ||
221 | static void | |
222 | set_observer_mode (char *args, int from_tty, | |
223 | struct cmd_list_element *c) | |
224 | { | |
d914c394 SS |
225 | if (target_has_execution) |
226 | { | |
227 | observer_mode_1 = observer_mode; | |
228 | error (_("Cannot change this setting while the inferior is running.")); | |
229 | } | |
230 | ||
231 | observer_mode = observer_mode_1; | |
232 | ||
233 | may_write_registers = !observer_mode; | |
234 | may_write_memory = !observer_mode; | |
235 | may_insert_breakpoints = !observer_mode; | |
236 | may_insert_tracepoints = !observer_mode; | |
237 | /* We can insert fast tracepoints in or out of observer mode, | |
238 | but enable them if we're going into this mode. */ | |
239 | if (observer_mode) | |
240 | may_insert_fast_tracepoints = 1; | |
241 | may_stop = !observer_mode; | |
242 | update_target_permissions (); | |
243 | ||
244 | /* Going *into* observer mode we must force non-stop, then | |
245 | going out we leave it that way. */ | |
246 | if (observer_mode) | |
247 | { | |
248 | target_async_permitted = 1; | |
249 | pagination_enabled = 0; | |
250 | non_stop = non_stop_1 = 1; | |
251 | } | |
252 | ||
253 | if (from_tty) | |
254 | printf_filtered (_("Observer mode is now %s.\n"), | |
255 | (observer_mode ? "on" : "off")); | |
256 | } | |
257 | ||
258 | static void | |
259 | show_observer_mode (struct ui_file *file, int from_tty, | |
260 | struct cmd_list_element *c, const char *value) | |
261 | { | |
262 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
263 | } | |
264 | ||
265 | /* This updates the value of observer mode based on changes in | |
266 | permissions. Note that we are deliberately ignoring the values of | |
267 | may-write-registers and may-write-memory, since the user may have | |
268 | reason to enable these during a session, for instance to turn on a | |
269 | debugging-related global. */ | |
270 | ||
271 | void | |
272 | update_observer_mode (void) | |
273 | { | |
274 | int newval; | |
275 | ||
276 | newval = (!may_insert_breakpoints | |
277 | && !may_insert_tracepoints | |
278 | && may_insert_fast_tracepoints | |
279 | && !may_stop | |
280 | && non_stop); | |
281 | ||
282 | /* Let the user know if things change. */ | |
283 | if (newval != observer_mode) | |
284 | printf_filtered (_("Observer mode is now %s.\n"), | |
285 | (newval ? "on" : "off")); | |
286 | ||
287 | observer_mode = observer_mode_1 = newval; | |
288 | } | |
c2c6d25f | 289 | |
c906108c SS |
290 | /* Tables of how to react to signals; the user sets them. */ |
291 | ||
292 | static unsigned char *signal_stop; | |
293 | static unsigned char *signal_print; | |
294 | static unsigned char *signal_program; | |
295 | ||
ab04a2af TT |
296 | /* Table of signals that are registered with "catch signal". A |
297 | non-zero entry indicates that the signal is caught by some "catch | |
298 | signal" command. This has size GDB_SIGNAL_LAST, to accommodate all | |
299 | signals. */ | |
300 | static unsigned char *signal_catch; | |
301 | ||
2455069d UW |
302 | /* Table of signals that the target may silently handle. |
303 | This is automatically determined from the flags above, | |
304 | and simply cached here. */ | |
305 | static unsigned char *signal_pass; | |
306 | ||
c906108c SS |
307 | #define SET_SIGS(nsigs,sigs,flags) \ |
308 | do { \ | |
309 | int signum = (nsigs); \ | |
310 | while (signum-- > 0) \ | |
311 | if ((sigs)[signum]) \ | |
312 | (flags)[signum] = 1; \ | |
313 | } while (0) | |
314 | ||
315 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
316 | do { \ | |
317 | int signum = (nsigs); \ | |
318 | while (signum-- > 0) \ | |
319 | if ((sigs)[signum]) \ | |
320 | (flags)[signum] = 0; \ | |
321 | } while (0) | |
322 | ||
9b224c5e PA |
323 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
324 | this function is to avoid exporting `signal_program'. */ | |
325 | ||
326 | void | |
327 | update_signals_program_target (void) | |
328 | { | |
a493e3e2 | 329 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); |
9b224c5e PA |
330 | } |
331 | ||
1777feb0 | 332 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 333 | |
edb3359d | 334 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
335 | |
336 | /* Command list pointer for the "stop" placeholder. */ | |
337 | ||
338 | static struct cmd_list_element *stop_command; | |
339 | ||
c906108c SS |
340 | /* Function inferior was in as of last step command. */ |
341 | ||
342 | static struct symbol *step_start_function; | |
343 | ||
c906108c SS |
344 | /* Nonzero if we want to give control to the user when we're notified |
345 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 346 | int stop_on_solib_events; |
f9e14852 GB |
347 | |
348 | /* Enable or disable optional shared library event breakpoints | |
349 | as appropriate when the above flag is changed. */ | |
350 | ||
351 | static void | |
352 | set_stop_on_solib_events (char *args, int from_tty, struct cmd_list_element *c) | |
353 | { | |
354 | update_solib_breakpoints (); | |
355 | } | |
356 | ||
920d2a44 AC |
357 | static void |
358 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
359 | struct cmd_list_element *c, const char *value) | |
360 | { | |
361 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
362 | value); | |
363 | } | |
c906108c | 364 | |
c906108c SS |
365 | /* Nonzero means expecting a trace trap |
366 | and should stop the inferior and return silently when it happens. */ | |
367 | ||
368 | int stop_after_trap; | |
369 | ||
642fd101 DE |
370 | /* Save register contents here when executing a "finish" command or are |
371 | about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set. | |
c906108c SS |
372 | Thus this contains the return value from the called function (assuming |
373 | values are returned in a register). */ | |
374 | ||
72cec141 | 375 | struct regcache *stop_registers; |
c906108c | 376 | |
c906108c SS |
377 | /* Nonzero after stop if current stack frame should be printed. */ |
378 | ||
379 | static int stop_print_frame; | |
380 | ||
e02bc4cc | 381 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
382 | returned by target_wait()/deprecated_target_wait_hook(). This |
383 | information is returned by get_last_target_status(). */ | |
39f77062 | 384 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
385 | static struct target_waitstatus target_last_waitstatus; |
386 | ||
0d1e5fa7 PA |
387 | static void context_switch (ptid_t ptid); |
388 | ||
4e1c45ea | 389 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 390 | |
7a76f5b8 | 391 | static void init_infwait_state (void); |
a474d7c2 | 392 | |
53904c9e AC |
393 | static const char follow_fork_mode_child[] = "child"; |
394 | static const char follow_fork_mode_parent[] = "parent"; | |
395 | ||
40478521 | 396 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
397 | follow_fork_mode_child, |
398 | follow_fork_mode_parent, | |
399 | NULL | |
ef346e04 | 400 | }; |
c906108c | 401 | |
53904c9e | 402 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
403 | static void |
404 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
405 | struct cmd_list_element *c, const char *value) | |
406 | { | |
3e43a32a MS |
407 | fprintf_filtered (file, |
408 | _("Debugger response to a program " | |
409 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
410 | value); |
411 | } | |
c906108c SS |
412 | \f |
413 | ||
e58b0e63 PA |
414 | /* Tell the target to follow the fork we're stopped at. Returns true |
415 | if the inferior should be resumed; false, if the target for some | |
416 | reason decided it's best not to resume. */ | |
417 | ||
6604731b | 418 | static int |
4ef3f3be | 419 | follow_fork (void) |
c906108c | 420 | { |
ea1dd7bc | 421 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
422 | int should_resume = 1; |
423 | struct thread_info *tp; | |
424 | ||
425 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
426 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
427 | parent thread structure's run control related fields, not just these. |
428 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
429 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 430 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
431 | CORE_ADDR step_range_start = 0; |
432 | CORE_ADDR step_range_end = 0; | |
433 | struct frame_id step_frame_id = { 0 }; | |
e58b0e63 PA |
434 | |
435 | if (!non_stop) | |
436 | { | |
437 | ptid_t wait_ptid; | |
438 | struct target_waitstatus wait_status; | |
439 | ||
440 | /* Get the last target status returned by target_wait(). */ | |
441 | get_last_target_status (&wait_ptid, &wait_status); | |
442 | ||
443 | /* If not stopped at a fork event, then there's nothing else to | |
444 | do. */ | |
445 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
446 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
447 | return 1; | |
448 | ||
449 | /* Check if we switched over from WAIT_PTID, since the event was | |
450 | reported. */ | |
451 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
452 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
453 | { | |
454 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
455 | target to follow it (in either direction). We'll | |
456 | afterwards refuse to resume, and inform the user what | |
457 | happened. */ | |
458 | switch_to_thread (wait_ptid); | |
459 | should_resume = 0; | |
460 | } | |
461 | } | |
462 | ||
463 | tp = inferior_thread (); | |
464 | ||
465 | /* If there were any forks/vforks that were caught and are now to be | |
466 | followed, then do so now. */ | |
467 | switch (tp->pending_follow.kind) | |
468 | { | |
469 | case TARGET_WAITKIND_FORKED: | |
470 | case TARGET_WAITKIND_VFORKED: | |
471 | { | |
472 | ptid_t parent, child; | |
473 | ||
474 | /* If the user did a next/step, etc, over a fork call, | |
475 | preserve the stepping state in the fork child. */ | |
476 | if (follow_child && should_resume) | |
477 | { | |
8358c15c JK |
478 | step_resume_breakpoint = clone_momentary_breakpoint |
479 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
480 | step_range_start = tp->control.step_range_start; |
481 | step_range_end = tp->control.step_range_end; | |
482 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
483 | exception_resume_breakpoint |
484 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
e58b0e63 PA |
485 | |
486 | /* For now, delete the parent's sr breakpoint, otherwise, | |
487 | parent/child sr breakpoints are considered duplicates, | |
488 | and the child version will not be installed. Remove | |
489 | this when the breakpoints module becomes aware of | |
490 | inferiors and address spaces. */ | |
491 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
492 | tp->control.step_range_start = 0; |
493 | tp->control.step_range_end = 0; | |
494 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 495 | delete_exception_resume_breakpoint (tp); |
e58b0e63 PA |
496 | } |
497 | ||
498 | parent = inferior_ptid; | |
499 | child = tp->pending_follow.value.related_pid; | |
500 | ||
501 | /* Tell the target to do whatever is necessary to follow | |
502 | either parent or child. */ | |
07107ca6 | 503 | if (target_follow_fork (follow_child, detach_fork)) |
e58b0e63 PA |
504 | { |
505 | /* Target refused to follow, or there's some other reason | |
506 | we shouldn't resume. */ | |
507 | should_resume = 0; | |
508 | } | |
509 | else | |
510 | { | |
511 | /* This pending follow fork event is now handled, one way | |
512 | or another. The previous selected thread may be gone | |
513 | from the lists by now, but if it is still around, need | |
514 | to clear the pending follow request. */ | |
e09875d4 | 515 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
516 | if (tp) |
517 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
518 | ||
519 | /* This makes sure we don't try to apply the "Switched | |
520 | over from WAIT_PID" logic above. */ | |
521 | nullify_last_target_wait_ptid (); | |
522 | ||
1777feb0 | 523 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
524 | if (follow_child) |
525 | { | |
526 | switch_to_thread (child); | |
527 | ||
528 | /* ... and preserve the stepping state, in case the | |
529 | user was stepping over the fork call. */ | |
530 | if (should_resume) | |
531 | { | |
532 | tp = inferior_thread (); | |
8358c15c JK |
533 | tp->control.step_resume_breakpoint |
534 | = step_resume_breakpoint; | |
16c381f0 JK |
535 | tp->control.step_range_start = step_range_start; |
536 | tp->control.step_range_end = step_range_end; | |
537 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
538 | tp->control.exception_resume_breakpoint |
539 | = exception_resume_breakpoint; | |
e58b0e63 PA |
540 | } |
541 | else | |
542 | { | |
543 | /* If we get here, it was because we're trying to | |
544 | resume from a fork catchpoint, but, the user | |
545 | has switched threads away from the thread that | |
546 | forked. In that case, the resume command | |
547 | issued is most likely not applicable to the | |
548 | child, so just warn, and refuse to resume. */ | |
3e43a32a MS |
549 | warning (_("Not resuming: switched threads " |
550 | "before following fork child.\n")); | |
e58b0e63 PA |
551 | } |
552 | ||
553 | /* Reset breakpoints in the child as appropriate. */ | |
554 | follow_inferior_reset_breakpoints (); | |
555 | } | |
556 | else | |
557 | switch_to_thread (parent); | |
558 | } | |
559 | } | |
560 | break; | |
561 | case TARGET_WAITKIND_SPURIOUS: | |
562 | /* Nothing to follow. */ | |
563 | break; | |
564 | default: | |
565 | internal_error (__FILE__, __LINE__, | |
566 | "Unexpected pending_follow.kind %d\n", | |
567 | tp->pending_follow.kind); | |
568 | break; | |
569 | } | |
c906108c | 570 | |
e58b0e63 | 571 | return should_resume; |
c906108c SS |
572 | } |
573 | ||
6604731b DJ |
574 | void |
575 | follow_inferior_reset_breakpoints (void) | |
c906108c | 576 | { |
4e1c45ea PA |
577 | struct thread_info *tp = inferior_thread (); |
578 | ||
6604731b DJ |
579 | /* Was there a step_resume breakpoint? (There was if the user |
580 | did a "next" at the fork() call.) If so, explicitly reset its | |
581 | thread number. | |
582 | ||
583 | step_resumes are a form of bp that are made to be per-thread. | |
584 | Since we created the step_resume bp when the parent process | |
585 | was being debugged, and now are switching to the child process, | |
586 | from the breakpoint package's viewpoint, that's a switch of | |
587 | "threads". We must update the bp's notion of which thread | |
588 | it is for, or it'll be ignored when it triggers. */ | |
589 | ||
8358c15c JK |
590 | if (tp->control.step_resume_breakpoint) |
591 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
6604731b | 592 | |
186c406b TT |
593 | if (tp->control.exception_resume_breakpoint) |
594 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
595 | ||
6604731b DJ |
596 | /* Reinsert all breakpoints in the child. The user may have set |
597 | breakpoints after catching the fork, in which case those | |
598 | were never set in the child, but only in the parent. This makes | |
599 | sure the inserted breakpoints match the breakpoint list. */ | |
600 | ||
601 | breakpoint_re_set (); | |
602 | insert_breakpoints (); | |
c906108c | 603 | } |
c906108c | 604 | |
6c95b8df PA |
605 | /* The child has exited or execed: resume threads of the parent the |
606 | user wanted to be executing. */ | |
607 | ||
608 | static int | |
609 | proceed_after_vfork_done (struct thread_info *thread, | |
610 | void *arg) | |
611 | { | |
612 | int pid = * (int *) arg; | |
613 | ||
614 | if (ptid_get_pid (thread->ptid) == pid | |
615 | && is_running (thread->ptid) | |
616 | && !is_executing (thread->ptid) | |
617 | && !thread->stop_requested | |
a493e3e2 | 618 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df PA |
619 | { |
620 | if (debug_infrun) | |
621 | fprintf_unfiltered (gdb_stdlog, | |
622 | "infrun: resuming vfork parent thread %s\n", | |
623 | target_pid_to_str (thread->ptid)); | |
624 | ||
625 | switch_to_thread (thread->ptid); | |
626 | clear_proceed_status (); | |
a493e3e2 | 627 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT, 0); |
6c95b8df PA |
628 | } |
629 | ||
630 | return 0; | |
631 | } | |
632 | ||
633 | /* Called whenever we notice an exec or exit event, to handle | |
634 | detaching or resuming a vfork parent. */ | |
635 | ||
636 | static void | |
637 | handle_vfork_child_exec_or_exit (int exec) | |
638 | { | |
639 | struct inferior *inf = current_inferior (); | |
640 | ||
641 | if (inf->vfork_parent) | |
642 | { | |
643 | int resume_parent = -1; | |
644 | ||
645 | /* This exec or exit marks the end of the shared memory region | |
646 | between the parent and the child. If the user wanted to | |
647 | detach from the parent, now is the time. */ | |
648 | ||
649 | if (inf->vfork_parent->pending_detach) | |
650 | { | |
651 | struct thread_info *tp; | |
652 | struct cleanup *old_chain; | |
653 | struct program_space *pspace; | |
654 | struct address_space *aspace; | |
655 | ||
1777feb0 | 656 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 657 | |
68c9da30 PA |
658 | inf->vfork_parent->pending_detach = 0; |
659 | ||
f50f4e56 PA |
660 | if (!exec) |
661 | { | |
662 | /* If we're handling a child exit, then inferior_ptid | |
663 | points at the inferior's pid, not to a thread. */ | |
664 | old_chain = save_inferior_ptid (); | |
665 | save_current_program_space (); | |
666 | save_current_inferior (); | |
667 | } | |
668 | else | |
669 | old_chain = save_current_space_and_thread (); | |
6c95b8df PA |
670 | |
671 | /* We're letting loose of the parent. */ | |
672 | tp = any_live_thread_of_process (inf->vfork_parent->pid); | |
673 | switch_to_thread (tp->ptid); | |
674 | ||
675 | /* We're about to detach from the parent, which implicitly | |
676 | removes breakpoints from its address space. There's a | |
677 | catch here: we want to reuse the spaces for the child, | |
678 | but, parent/child are still sharing the pspace at this | |
679 | point, although the exec in reality makes the kernel give | |
680 | the child a fresh set of new pages. The problem here is | |
681 | that the breakpoints module being unaware of this, would | |
682 | likely chose the child process to write to the parent | |
683 | address space. Swapping the child temporarily away from | |
684 | the spaces has the desired effect. Yes, this is "sort | |
685 | of" a hack. */ | |
686 | ||
687 | pspace = inf->pspace; | |
688 | aspace = inf->aspace; | |
689 | inf->aspace = NULL; | |
690 | inf->pspace = NULL; | |
691 | ||
692 | if (debug_infrun || info_verbose) | |
693 | { | |
694 | target_terminal_ours (); | |
695 | ||
696 | if (exec) | |
697 | fprintf_filtered (gdb_stdlog, | |
3e43a32a MS |
698 | "Detaching vfork parent process " |
699 | "%d after child exec.\n", | |
6c95b8df PA |
700 | inf->vfork_parent->pid); |
701 | else | |
702 | fprintf_filtered (gdb_stdlog, | |
3e43a32a MS |
703 | "Detaching vfork parent process " |
704 | "%d after child exit.\n", | |
6c95b8df PA |
705 | inf->vfork_parent->pid); |
706 | } | |
707 | ||
708 | target_detach (NULL, 0); | |
709 | ||
710 | /* Put it back. */ | |
711 | inf->pspace = pspace; | |
712 | inf->aspace = aspace; | |
713 | ||
714 | do_cleanups (old_chain); | |
715 | } | |
716 | else if (exec) | |
717 | { | |
718 | /* We're staying attached to the parent, so, really give the | |
719 | child a new address space. */ | |
720 | inf->pspace = add_program_space (maybe_new_address_space ()); | |
721 | inf->aspace = inf->pspace->aspace; | |
722 | inf->removable = 1; | |
723 | set_current_program_space (inf->pspace); | |
724 | ||
725 | resume_parent = inf->vfork_parent->pid; | |
726 | ||
727 | /* Break the bonds. */ | |
728 | inf->vfork_parent->vfork_child = NULL; | |
729 | } | |
730 | else | |
731 | { | |
732 | struct cleanup *old_chain; | |
733 | struct program_space *pspace; | |
734 | ||
735 | /* If this is a vfork child exiting, then the pspace and | |
736 | aspaces were shared with the parent. Since we're | |
737 | reporting the process exit, we'll be mourning all that is | |
738 | found in the address space, and switching to null_ptid, | |
739 | preparing to start a new inferior. But, since we don't | |
740 | want to clobber the parent's address/program spaces, we | |
741 | go ahead and create a new one for this exiting | |
742 | inferior. */ | |
743 | ||
744 | /* Switch to null_ptid, so that clone_program_space doesn't want | |
745 | to read the selected frame of a dead process. */ | |
746 | old_chain = save_inferior_ptid (); | |
747 | inferior_ptid = null_ptid; | |
748 | ||
749 | /* This inferior is dead, so avoid giving the breakpoints | |
750 | module the option to write through to it (cloning a | |
751 | program space resets breakpoints). */ | |
752 | inf->aspace = NULL; | |
753 | inf->pspace = NULL; | |
754 | pspace = add_program_space (maybe_new_address_space ()); | |
755 | set_current_program_space (pspace); | |
756 | inf->removable = 1; | |
7dcd53a0 | 757 | inf->symfile_flags = SYMFILE_NO_READ; |
6c95b8df PA |
758 | clone_program_space (pspace, inf->vfork_parent->pspace); |
759 | inf->pspace = pspace; | |
760 | inf->aspace = pspace->aspace; | |
761 | ||
762 | /* Put back inferior_ptid. We'll continue mourning this | |
1777feb0 | 763 | inferior. */ |
6c95b8df PA |
764 | do_cleanups (old_chain); |
765 | ||
766 | resume_parent = inf->vfork_parent->pid; | |
767 | /* Break the bonds. */ | |
768 | inf->vfork_parent->vfork_child = NULL; | |
769 | } | |
770 | ||
771 | inf->vfork_parent = NULL; | |
772 | ||
773 | gdb_assert (current_program_space == inf->pspace); | |
774 | ||
775 | if (non_stop && resume_parent != -1) | |
776 | { | |
777 | /* If the user wanted the parent to be running, let it go | |
778 | free now. */ | |
779 | struct cleanup *old_chain = make_cleanup_restore_current_thread (); | |
780 | ||
781 | if (debug_infrun) | |
3e43a32a MS |
782 | fprintf_unfiltered (gdb_stdlog, |
783 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
784 | resume_parent); |
785 | ||
786 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
787 | ||
788 | do_cleanups (old_chain); | |
789 | } | |
790 | } | |
791 | } | |
792 | ||
eb6c553b | 793 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
794 | |
795 | static const char follow_exec_mode_new[] = "new"; | |
796 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 797 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
798 | { |
799 | follow_exec_mode_new, | |
800 | follow_exec_mode_same, | |
801 | NULL, | |
802 | }; | |
803 | ||
804 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
805 | static void | |
806 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
807 | struct cmd_list_element *c, const char *value) | |
808 | { | |
809 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
810 | } | |
811 | ||
1777feb0 | 812 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
1adeb98a | 813 | |
c906108c | 814 | static void |
3a3e9ee3 | 815 | follow_exec (ptid_t pid, char *execd_pathname) |
c906108c | 816 | { |
4e1c45ea | 817 | struct thread_info *th = inferior_thread (); |
6c95b8df | 818 | struct inferior *inf = current_inferior (); |
7a292a7a | 819 | |
c906108c SS |
820 | /* This is an exec event that we actually wish to pay attention to. |
821 | Refresh our symbol table to the newly exec'd program, remove any | |
822 | momentary bp's, etc. | |
823 | ||
824 | If there are breakpoints, they aren't really inserted now, | |
825 | since the exec() transformed our inferior into a fresh set | |
826 | of instructions. | |
827 | ||
828 | We want to preserve symbolic breakpoints on the list, since | |
829 | we have hopes that they can be reset after the new a.out's | |
830 | symbol table is read. | |
831 | ||
832 | However, any "raw" breakpoints must be removed from the list | |
833 | (e.g., the solib bp's), since their address is probably invalid | |
834 | now. | |
835 | ||
836 | And, we DON'T want to call delete_breakpoints() here, since | |
837 | that may write the bp's "shadow contents" (the instruction | |
838 | value that was overwritten witha TRAP instruction). Since | |
1777feb0 | 839 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
840 | |
841 | mark_breakpoints_out (); | |
842 | ||
c906108c SS |
843 | update_breakpoints_after_exec (); |
844 | ||
845 | /* If there was one, it's gone now. We cannot truly step-to-next | |
1777feb0 | 846 | statement through an exec(). */ |
8358c15c | 847 | th->control.step_resume_breakpoint = NULL; |
186c406b | 848 | th->control.exception_resume_breakpoint = NULL; |
16c381f0 JK |
849 | th->control.step_range_start = 0; |
850 | th->control.step_range_end = 0; | |
c906108c | 851 | |
a75724bc PA |
852 | /* The target reports the exec event to the main thread, even if |
853 | some other thread does the exec, and even if the main thread was | |
854 | already stopped --- if debugging in non-stop mode, it's possible | |
855 | the user had the main thread held stopped in the previous image | |
856 | --- release it now. This is the same behavior as step-over-exec | |
857 | with scheduler-locking on in all-stop mode. */ | |
858 | th->stop_requested = 0; | |
859 | ||
1777feb0 | 860 | /* What is this a.out's name? */ |
6c95b8df PA |
861 | printf_unfiltered (_("%s is executing new program: %s\n"), |
862 | target_pid_to_str (inferior_ptid), | |
863 | execd_pathname); | |
c906108c SS |
864 | |
865 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 866 | inferior has essentially been killed & reborn. */ |
7a292a7a | 867 | |
c906108c | 868 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
869 | |
870 | breakpoint_init_inferior (inf_execd); | |
e85a822c DJ |
871 | |
872 | if (gdb_sysroot && *gdb_sysroot) | |
873 | { | |
874 | char *name = alloca (strlen (gdb_sysroot) | |
875 | + strlen (execd_pathname) | |
876 | + 1); | |
abbb1732 | 877 | |
e85a822c DJ |
878 | strcpy (name, gdb_sysroot); |
879 | strcat (name, execd_pathname); | |
880 | execd_pathname = name; | |
881 | } | |
c906108c | 882 | |
cce9b6bf PA |
883 | /* Reset the shared library package. This ensures that we get a |
884 | shlib event when the child reaches "_start", at which point the | |
885 | dld will have had a chance to initialize the child. */ | |
886 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
887 | we don't want those to be satisfied by the libraries of the | |
888 | previous incarnation of this process. */ | |
889 | no_shared_libraries (NULL, 0); | |
890 | ||
6c95b8df PA |
891 | if (follow_exec_mode_string == follow_exec_mode_new) |
892 | { | |
893 | struct program_space *pspace; | |
6c95b8df PA |
894 | |
895 | /* The user wants to keep the old inferior and program spaces | |
896 | around. Create a new fresh one, and switch to it. */ | |
897 | ||
898 | inf = add_inferior (current_inferior ()->pid); | |
899 | pspace = add_program_space (maybe_new_address_space ()); | |
900 | inf->pspace = pspace; | |
901 | inf->aspace = pspace->aspace; | |
902 | ||
903 | exit_inferior_num_silent (current_inferior ()->num); | |
904 | ||
905 | set_current_inferior (inf); | |
906 | set_current_program_space (pspace); | |
907 | } | |
9107fc8d PA |
908 | else |
909 | { | |
910 | /* The old description may no longer be fit for the new image. | |
911 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
912 | old description; we'll read a new one below. No need to do | |
913 | this on "follow-exec-mode new", as the old inferior stays | |
914 | around (its description is later cleared/refetched on | |
915 | restart). */ | |
916 | target_clear_description (); | |
917 | } | |
6c95b8df PA |
918 | |
919 | gdb_assert (current_program_space == inf->pspace); | |
920 | ||
1777feb0 | 921 | /* That a.out is now the one to use. */ |
6c95b8df PA |
922 | exec_file_attach (execd_pathname, 0); |
923 | ||
c1e56572 JK |
924 | /* SYMFILE_DEFER_BP_RESET is used as the proper displacement for PIE |
925 | (Position Independent Executable) main symbol file will get applied by | |
926 | solib_create_inferior_hook below. breakpoint_re_set would fail to insert | |
927 | the breakpoints with the zero displacement. */ | |
928 | ||
7dcd53a0 TT |
929 | symbol_file_add (execd_pathname, |
930 | (inf->symfile_flags | |
931 | | SYMFILE_MAINLINE | SYMFILE_DEFER_BP_RESET), | |
c1e56572 JK |
932 | NULL, 0); |
933 | ||
7dcd53a0 TT |
934 | if ((inf->symfile_flags & SYMFILE_NO_READ) == 0) |
935 | set_initial_language (); | |
c906108c | 936 | |
9107fc8d PA |
937 | /* If the target can specify a description, read it. Must do this |
938 | after flipping to the new executable (because the target supplied | |
939 | description must be compatible with the executable's | |
940 | architecture, and the old executable may e.g., be 32-bit, while | |
941 | the new one 64-bit), and before anything involving memory or | |
942 | registers. */ | |
943 | target_find_description (); | |
944 | ||
268a4a75 | 945 | solib_create_inferior_hook (0); |
c906108c | 946 | |
4efc6507 DE |
947 | jit_inferior_created_hook (); |
948 | ||
c1e56572 JK |
949 | breakpoint_re_set (); |
950 | ||
c906108c SS |
951 | /* Reinsert all breakpoints. (Those which were symbolic have |
952 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 953 | to symbol_file_command...). */ |
c906108c SS |
954 | insert_breakpoints (); |
955 | ||
956 | /* The next resume of this inferior should bring it to the shlib | |
957 | startup breakpoints. (If the user had also set bp's on | |
958 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 959 | matically get reset there in the new process.). */ |
c906108c SS |
960 | } |
961 | ||
962 | /* Non-zero if we just simulating a single-step. This is needed | |
963 | because we cannot remove the breakpoints in the inferior process | |
964 | until after the `wait' in `wait_for_inferior'. */ | |
965 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
966 | |
967 | /* The thread we inserted single-step breakpoints for. */ | |
968 | static ptid_t singlestep_ptid; | |
969 | ||
fd48f117 DJ |
970 | /* PC when we started this single-step. */ |
971 | static CORE_ADDR singlestep_pc; | |
972 | ||
31e77af2 PA |
973 | /* Info about an instruction that is being stepped over. Invalid if |
974 | ASPACE is NULL. */ | |
975 | ||
976 | struct step_over_info | |
977 | { | |
978 | /* The instruction's address space. */ | |
979 | struct address_space *aspace; | |
980 | ||
981 | /* The instruction's address. */ | |
982 | CORE_ADDR address; | |
983 | }; | |
984 | ||
985 | /* The step-over info of the location that is being stepped over. | |
986 | ||
987 | Note that with async/breakpoint always-inserted mode, a user might | |
988 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
989 | being stepped over. As setting a new breakpoint inserts all | |
990 | breakpoints, we need to make sure the breakpoint being stepped over | |
991 | isn't inserted then. We do that by only clearing the step-over | |
992 | info when the step-over is actually finished (or aborted). | |
993 | ||
994 | Presently GDB can only step over one breakpoint at any given time. | |
995 | Given threads that can't run code in the same address space as the | |
996 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
997 | to step-over at most one breakpoint per address space (so this info | |
998 | could move to the address space object if/when GDB is extended). | |
999 | The set of breakpoints being stepped over will normally be much | |
1000 | smaller than the set of all breakpoints, so a flag in the | |
1001 | breakpoint location structure would be wasteful. A separate list | |
1002 | also saves complexity and run-time, as otherwise we'd have to go | |
1003 | through all breakpoint locations clearing their flag whenever we | |
1004 | start a new sequence. Similar considerations weigh against storing | |
1005 | this info in the thread object. Plus, not all step overs actually | |
1006 | have breakpoint locations -- e.g., stepping past a single-step | |
1007 | breakpoint, or stepping to complete a non-continuable | |
1008 | watchpoint. */ | |
1009 | static struct step_over_info step_over_info; | |
1010 | ||
1011 | /* Record the address of the breakpoint/instruction we're currently | |
1012 | stepping over. */ | |
1013 | ||
1014 | static void | |
1015 | set_step_over_info (struct address_space *aspace, CORE_ADDR address) | |
1016 | { | |
1017 | step_over_info.aspace = aspace; | |
1018 | step_over_info.address = address; | |
1019 | } | |
1020 | ||
1021 | /* Called when we're not longer stepping over a breakpoint / an | |
1022 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1023 | ||
1024 | static void | |
1025 | clear_step_over_info (void) | |
1026 | { | |
1027 | step_over_info.aspace = NULL; | |
1028 | step_over_info.address = 0; | |
1029 | } | |
1030 | ||
1031 | /* See inferior.h. */ | |
1032 | ||
1033 | int | |
1034 | stepping_past_instruction_at (struct address_space *aspace, | |
1035 | CORE_ADDR address) | |
1036 | { | |
1037 | return (step_over_info.aspace != NULL | |
1038 | && breakpoint_address_match (aspace, address, | |
1039 | step_over_info.aspace, | |
1040 | step_over_info.address)); | |
1041 | } | |
1042 | ||
c906108c | 1043 | \f |
237fc4c9 PA |
1044 | /* Displaced stepping. */ |
1045 | ||
1046 | /* In non-stop debugging mode, we must take special care to manage | |
1047 | breakpoints properly; in particular, the traditional strategy for | |
1048 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1049 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1050 | breakpoint it has hit while ensuring that other threads running | |
1051 | concurrently will hit the breakpoint as they should. | |
1052 | ||
1053 | The traditional way to step a thread T off a breakpoint in a | |
1054 | multi-threaded program in all-stop mode is as follows: | |
1055 | ||
1056 | a0) Initially, all threads are stopped, and breakpoints are not | |
1057 | inserted. | |
1058 | a1) We single-step T, leaving breakpoints uninserted. | |
1059 | a2) We insert breakpoints, and resume all threads. | |
1060 | ||
1061 | In non-stop debugging, however, this strategy is unsuitable: we | |
1062 | don't want to have to stop all threads in the system in order to | |
1063 | continue or step T past a breakpoint. Instead, we use displaced | |
1064 | stepping: | |
1065 | ||
1066 | n0) Initially, T is stopped, other threads are running, and | |
1067 | breakpoints are inserted. | |
1068 | n1) We copy the instruction "under" the breakpoint to a separate | |
1069 | location, outside the main code stream, making any adjustments | |
1070 | to the instruction, register, and memory state as directed by | |
1071 | T's architecture. | |
1072 | n2) We single-step T over the instruction at its new location. | |
1073 | n3) We adjust the resulting register and memory state as directed | |
1074 | by T's architecture. This includes resetting T's PC to point | |
1075 | back into the main instruction stream. | |
1076 | n4) We resume T. | |
1077 | ||
1078 | This approach depends on the following gdbarch methods: | |
1079 | ||
1080 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1081 | indicate where to copy the instruction, and how much space must | |
1082 | be reserved there. We use these in step n1. | |
1083 | ||
1084 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1085 | address, and makes any necessary adjustments to the instruction, | |
1086 | register contents, and memory. We use this in step n1. | |
1087 | ||
1088 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
1089 | we have successfuly single-stepped the instruction, to yield the | |
1090 | same effect the instruction would have had if we had executed it | |
1091 | at its original address. We use this in step n3. | |
1092 | ||
1093 | - gdbarch_displaced_step_free_closure provides cleanup. | |
1094 | ||
1095 | The gdbarch_displaced_step_copy_insn and | |
1096 | gdbarch_displaced_step_fixup functions must be written so that | |
1097 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1098 | single-stepping across the copied instruction, and then applying | |
1099 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1100 | thread's memory and registers as stepping the instruction in place | |
1101 | would have. Exactly which responsibilities fall to the copy and | |
1102 | which fall to the fixup is up to the author of those functions. | |
1103 | ||
1104 | See the comments in gdbarch.sh for details. | |
1105 | ||
1106 | Note that displaced stepping and software single-step cannot | |
1107 | currently be used in combination, although with some care I think | |
1108 | they could be made to. Software single-step works by placing | |
1109 | breakpoints on all possible subsequent instructions; if the | |
1110 | displaced instruction is a PC-relative jump, those breakpoints | |
1111 | could fall in very strange places --- on pages that aren't | |
1112 | executable, or at addresses that are not proper instruction | |
1113 | boundaries. (We do generally let other threads run while we wait | |
1114 | to hit the software single-step breakpoint, and they might | |
1115 | encounter such a corrupted instruction.) One way to work around | |
1116 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1117 | simulate the effect of PC-relative instructions (and return NULL) | |
1118 | on architectures that use software single-stepping. | |
1119 | ||
1120 | In non-stop mode, we can have independent and simultaneous step | |
1121 | requests, so more than one thread may need to simultaneously step | |
1122 | over a breakpoint. The current implementation assumes there is | |
1123 | only one scratch space per process. In this case, we have to | |
1124 | serialize access to the scratch space. If thread A wants to step | |
1125 | over a breakpoint, but we are currently waiting for some other | |
1126 | thread to complete a displaced step, we leave thread A stopped and | |
1127 | place it in the displaced_step_request_queue. Whenever a displaced | |
1128 | step finishes, we pick the next thread in the queue and start a new | |
1129 | displaced step operation on it. See displaced_step_prepare and | |
1130 | displaced_step_fixup for details. */ | |
1131 | ||
237fc4c9 PA |
1132 | struct displaced_step_request |
1133 | { | |
1134 | ptid_t ptid; | |
1135 | struct displaced_step_request *next; | |
1136 | }; | |
1137 | ||
fc1cf338 PA |
1138 | /* Per-inferior displaced stepping state. */ |
1139 | struct displaced_step_inferior_state | |
1140 | { | |
1141 | /* Pointer to next in linked list. */ | |
1142 | struct displaced_step_inferior_state *next; | |
1143 | ||
1144 | /* The process this displaced step state refers to. */ | |
1145 | int pid; | |
1146 | ||
1147 | /* A queue of pending displaced stepping requests. One entry per | |
1148 | thread that needs to do a displaced step. */ | |
1149 | struct displaced_step_request *step_request_queue; | |
1150 | ||
1151 | /* If this is not null_ptid, this is the thread carrying out a | |
1152 | displaced single-step in process PID. This thread's state will | |
1153 | require fixing up once it has completed its step. */ | |
1154 | ptid_t step_ptid; | |
1155 | ||
1156 | /* The architecture the thread had when we stepped it. */ | |
1157 | struct gdbarch *step_gdbarch; | |
1158 | ||
1159 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
1160 | for post-step cleanup. */ | |
1161 | struct displaced_step_closure *step_closure; | |
1162 | ||
1163 | /* The address of the original instruction, and the copy we | |
1164 | made. */ | |
1165 | CORE_ADDR step_original, step_copy; | |
1166 | ||
1167 | /* Saved contents of copy area. */ | |
1168 | gdb_byte *step_saved_copy; | |
1169 | }; | |
1170 | ||
1171 | /* The list of states of processes involved in displaced stepping | |
1172 | presently. */ | |
1173 | static struct displaced_step_inferior_state *displaced_step_inferior_states; | |
1174 | ||
1175 | /* Get the displaced stepping state of process PID. */ | |
1176 | ||
1177 | static struct displaced_step_inferior_state * | |
1178 | get_displaced_stepping_state (int pid) | |
1179 | { | |
1180 | struct displaced_step_inferior_state *state; | |
1181 | ||
1182 | for (state = displaced_step_inferior_states; | |
1183 | state != NULL; | |
1184 | state = state->next) | |
1185 | if (state->pid == pid) | |
1186 | return state; | |
1187 | ||
1188 | return NULL; | |
1189 | } | |
1190 | ||
1191 | /* Add a new displaced stepping state for process PID to the displaced | |
1192 | stepping state list, or return a pointer to an already existing | |
1193 | entry, if it already exists. Never returns NULL. */ | |
1194 | ||
1195 | static struct displaced_step_inferior_state * | |
1196 | add_displaced_stepping_state (int pid) | |
1197 | { | |
1198 | struct displaced_step_inferior_state *state; | |
1199 | ||
1200 | for (state = displaced_step_inferior_states; | |
1201 | state != NULL; | |
1202 | state = state->next) | |
1203 | if (state->pid == pid) | |
1204 | return state; | |
237fc4c9 | 1205 | |
fc1cf338 PA |
1206 | state = xcalloc (1, sizeof (*state)); |
1207 | state->pid = pid; | |
1208 | state->next = displaced_step_inferior_states; | |
1209 | displaced_step_inferior_states = state; | |
237fc4c9 | 1210 | |
fc1cf338 PA |
1211 | return state; |
1212 | } | |
1213 | ||
a42244db YQ |
1214 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1215 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1216 | return NULL. */ | |
1217 | ||
1218 | struct displaced_step_closure* | |
1219 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1220 | { | |
1221 | struct displaced_step_inferior_state *displaced | |
1222 | = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); | |
1223 | ||
1224 | /* If checking the mode of displaced instruction in copy area. */ | |
1225 | if (displaced && !ptid_equal (displaced->step_ptid, null_ptid) | |
1226 | && (displaced->step_copy == addr)) | |
1227 | return displaced->step_closure; | |
1228 | ||
1229 | return NULL; | |
1230 | } | |
1231 | ||
fc1cf338 | 1232 | /* Remove the displaced stepping state of process PID. */ |
237fc4c9 | 1233 | |
fc1cf338 PA |
1234 | static void |
1235 | remove_displaced_stepping_state (int pid) | |
1236 | { | |
1237 | struct displaced_step_inferior_state *it, **prev_next_p; | |
237fc4c9 | 1238 | |
fc1cf338 PA |
1239 | gdb_assert (pid != 0); |
1240 | ||
1241 | it = displaced_step_inferior_states; | |
1242 | prev_next_p = &displaced_step_inferior_states; | |
1243 | while (it) | |
1244 | { | |
1245 | if (it->pid == pid) | |
1246 | { | |
1247 | *prev_next_p = it->next; | |
1248 | xfree (it); | |
1249 | return; | |
1250 | } | |
1251 | ||
1252 | prev_next_p = &it->next; | |
1253 | it = *prev_next_p; | |
1254 | } | |
1255 | } | |
1256 | ||
1257 | static void | |
1258 | infrun_inferior_exit (struct inferior *inf) | |
1259 | { | |
1260 | remove_displaced_stepping_state (inf->pid); | |
1261 | } | |
237fc4c9 | 1262 | |
fff08868 HZ |
1263 | /* If ON, and the architecture supports it, GDB will use displaced |
1264 | stepping to step over breakpoints. If OFF, or if the architecture | |
1265 | doesn't support it, GDB will instead use the traditional | |
1266 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1267 | decide which technique to use to step over breakpoints depending on | |
1268 | which of all-stop or non-stop mode is active --- displaced stepping | |
1269 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1270 | ||
72d0e2c5 | 1271 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1272 | |
237fc4c9 PA |
1273 | static void |
1274 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1275 | struct cmd_list_element *c, | |
1276 | const char *value) | |
1277 | { | |
72d0e2c5 | 1278 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1279 | fprintf_filtered (file, |
1280 | _("Debugger's willingness to use displaced stepping " | |
1281 | "to step over breakpoints is %s (currently %s).\n"), | |
fff08868 HZ |
1282 | value, non_stop ? "on" : "off"); |
1283 | else | |
3e43a32a MS |
1284 | fprintf_filtered (file, |
1285 | _("Debugger's willingness to use displaced stepping " | |
1286 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1287 | } |
1288 | ||
fff08868 HZ |
1289 | /* Return non-zero if displaced stepping can/should be used to step |
1290 | over breakpoints. */ | |
1291 | ||
237fc4c9 PA |
1292 | static int |
1293 | use_displaced_stepping (struct gdbarch *gdbarch) | |
1294 | { | |
72d0e2c5 YQ |
1295 | return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO && non_stop) |
1296 | || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
96429cc8 | 1297 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
8213266a | 1298 | && find_record_target () == NULL); |
237fc4c9 PA |
1299 | } |
1300 | ||
1301 | /* Clean out any stray displaced stepping state. */ | |
1302 | static void | |
fc1cf338 | 1303 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1304 | { |
1305 | /* Indicate that there is no cleanup pending. */ | |
fc1cf338 | 1306 | displaced->step_ptid = null_ptid; |
237fc4c9 | 1307 | |
fc1cf338 | 1308 | if (displaced->step_closure) |
237fc4c9 | 1309 | { |
fc1cf338 PA |
1310 | gdbarch_displaced_step_free_closure (displaced->step_gdbarch, |
1311 | displaced->step_closure); | |
1312 | displaced->step_closure = NULL; | |
237fc4c9 PA |
1313 | } |
1314 | } | |
1315 | ||
1316 | static void | |
fc1cf338 | 1317 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1318 | { |
fc1cf338 PA |
1319 | struct displaced_step_inferior_state *state = arg; |
1320 | ||
1321 | displaced_step_clear (state); | |
237fc4c9 PA |
1322 | } |
1323 | ||
1324 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1325 | void | |
1326 | displaced_step_dump_bytes (struct ui_file *file, | |
1327 | const gdb_byte *buf, | |
1328 | size_t len) | |
1329 | { | |
1330 | int i; | |
1331 | ||
1332 | for (i = 0; i < len; i++) | |
1333 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1334 | fputs_unfiltered ("\n", file); | |
1335 | } | |
1336 | ||
1337 | /* Prepare to single-step, using displaced stepping. | |
1338 | ||
1339 | Note that we cannot use displaced stepping when we have a signal to | |
1340 | deliver. If we have a signal to deliver and an instruction to step | |
1341 | over, then after the step, there will be no indication from the | |
1342 | target whether the thread entered a signal handler or ignored the | |
1343 | signal and stepped over the instruction successfully --- both cases | |
1344 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1345 | fixup, and in the second case we must --- but we can't tell which. | |
1346 | Comments in the code for 'random signals' in handle_inferior_event | |
1347 | explain how we handle this case instead. | |
1348 | ||
1349 | Returns 1 if preparing was successful -- this thread is going to be | |
1350 | stepped now; or 0 if displaced stepping this thread got queued. */ | |
1351 | static int | |
1352 | displaced_step_prepare (ptid_t ptid) | |
1353 | { | |
ad53cd71 | 1354 | struct cleanup *old_cleanups, *ignore_cleanups; |
c1e36e3e | 1355 | struct thread_info *tp = find_thread_ptid (ptid); |
237fc4c9 PA |
1356 | struct regcache *regcache = get_thread_regcache (ptid); |
1357 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1358 | CORE_ADDR original, copy; | |
1359 | ULONGEST len; | |
1360 | struct displaced_step_closure *closure; | |
fc1cf338 | 1361 | struct displaced_step_inferior_state *displaced; |
9e529e1d | 1362 | int status; |
237fc4c9 PA |
1363 | |
1364 | /* We should never reach this function if the architecture does not | |
1365 | support displaced stepping. */ | |
1366 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1367 | ||
c1e36e3e PA |
1368 | /* Disable range stepping while executing in the scratch pad. We |
1369 | want a single-step even if executing the displaced instruction in | |
1370 | the scratch buffer lands within the stepping range (e.g., a | |
1371 | jump/branch). */ | |
1372 | tp->control.may_range_step = 0; | |
1373 | ||
fc1cf338 PA |
1374 | /* We have to displaced step one thread at a time, as we only have |
1375 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1376 | |
fc1cf338 PA |
1377 | displaced = add_displaced_stepping_state (ptid_get_pid (ptid)); |
1378 | ||
1379 | if (!ptid_equal (displaced->step_ptid, null_ptid)) | |
237fc4c9 PA |
1380 | { |
1381 | /* Already waiting for a displaced step to finish. Defer this | |
1382 | request and place in queue. */ | |
1383 | struct displaced_step_request *req, *new_req; | |
1384 | ||
1385 | if (debug_displaced) | |
1386 | fprintf_unfiltered (gdb_stdlog, | |
1387 | "displaced: defering step of %s\n", | |
1388 | target_pid_to_str (ptid)); | |
1389 | ||
1390 | new_req = xmalloc (sizeof (*new_req)); | |
1391 | new_req->ptid = ptid; | |
1392 | new_req->next = NULL; | |
1393 | ||
fc1cf338 | 1394 | if (displaced->step_request_queue) |
237fc4c9 | 1395 | { |
fc1cf338 | 1396 | for (req = displaced->step_request_queue; |
237fc4c9 PA |
1397 | req && req->next; |
1398 | req = req->next) | |
1399 | ; | |
1400 | req->next = new_req; | |
1401 | } | |
1402 | else | |
fc1cf338 | 1403 | displaced->step_request_queue = new_req; |
237fc4c9 PA |
1404 | |
1405 | return 0; | |
1406 | } | |
1407 | else | |
1408 | { | |
1409 | if (debug_displaced) | |
1410 | fprintf_unfiltered (gdb_stdlog, | |
1411 | "displaced: stepping %s now\n", | |
1412 | target_pid_to_str (ptid)); | |
1413 | } | |
1414 | ||
fc1cf338 | 1415 | displaced_step_clear (displaced); |
237fc4c9 | 1416 | |
ad53cd71 PA |
1417 | old_cleanups = save_inferior_ptid (); |
1418 | inferior_ptid = ptid; | |
1419 | ||
515630c5 | 1420 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1421 | |
1422 | copy = gdbarch_displaced_step_location (gdbarch); | |
1423 | len = gdbarch_max_insn_length (gdbarch); | |
1424 | ||
1425 | /* Save the original contents of the copy area. */ | |
fc1cf338 | 1426 | displaced->step_saved_copy = xmalloc (len); |
ad53cd71 | 1427 | ignore_cleanups = make_cleanup (free_current_contents, |
fc1cf338 | 1428 | &displaced->step_saved_copy); |
9e529e1d JK |
1429 | status = target_read_memory (copy, displaced->step_saved_copy, len); |
1430 | if (status != 0) | |
1431 | throw_error (MEMORY_ERROR, | |
1432 | _("Error accessing memory address %s (%s) for " | |
1433 | "displaced-stepping scratch space."), | |
1434 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1435 | if (debug_displaced) |
1436 | { | |
5af949e3 UW |
1437 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1438 | paddress (gdbarch, copy)); | |
fc1cf338 PA |
1439 | displaced_step_dump_bytes (gdb_stdlog, |
1440 | displaced->step_saved_copy, | |
1441 | len); | |
237fc4c9 PA |
1442 | }; |
1443 | ||
1444 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1445 | original, copy, regcache); |
237fc4c9 PA |
1446 | |
1447 | /* We don't support the fully-simulated case at present. */ | |
1448 | gdb_assert (closure); | |
1449 | ||
9f5a595d UW |
1450 | /* Save the information we need to fix things up if the step |
1451 | succeeds. */ | |
fc1cf338 PA |
1452 | displaced->step_ptid = ptid; |
1453 | displaced->step_gdbarch = gdbarch; | |
1454 | displaced->step_closure = closure; | |
1455 | displaced->step_original = original; | |
1456 | displaced->step_copy = copy; | |
9f5a595d | 1457 | |
fc1cf338 | 1458 | make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1459 | |
1460 | /* Resume execution at the copy. */ | |
515630c5 | 1461 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1462 | |
ad53cd71 PA |
1463 | discard_cleanups (ignore_cleanups); |
1464 | ||
1465 | do_cleanups (old_cleanups); | |
237fc4c9 PA |
1466 | |
1467 | if (debug_displaced) | |
5af949e3 UW |
1468 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1469 | paddress (gdbarch, copy)); | |
237fc4c9 | 1470 | |
237fc4c9 PA |
1471 | return 1; |
1472 | } | |
1473 | ||
237fc4c9 | 1474 | static void |
3e43a32a MS |
1475 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1476 | const gdb_byte *myaddr, int len) | |
237fc4c9 PA |
1477 | { |
1478 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
abbb1732 | 1479 | |
237fc4c9 PA |
1480 | inferior_ptid = ptid; |
1481 | write_memory (memaddr, myaddr, len); | |
1482 | do_cleanups (ptid_cleanup); | |
1483 | } | |
1484 | ||
e2d96639 YQ |
1485 | /* Restore the contents of the copy area for thread PTID. */ |
1486 | ||
1487 | static void | |
1488 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1489 | ptid_t ptid) | |
1490 | { | |
1491 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1492 | ||
1493 | write_memory_ptid (ptid, displaced->step_copy, | |
1494 | displaced->step_saved_copy, len); | |
1495 | if (debug_displaced) | |
1496 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
1497 | target_pid_to_str (ptid), | |
1498 | paddress (displaced->step_gdbarch, | |
1499 | displaced->step_copy)); | |
1500 | } | |
1501 | ||
237fc4c9 | 1502 | static void |
2ea28649 | 1503 | displaced_step_fixup (ptid_t event_ptid, enum gdb_signal signal) |
237fc4c9 PA |
1504 | { |
1505 | struct cleanup *old_cleanups; | |
fc1cf338 PA |
1506 | struct displaced_step_inferior_state *displaced |
1507 | = get_displaced_stepping_state (ptid_get_pid (event_ptid)); | |
1508 | ||
1509 | /* Was any thread of this process doing a displaced step? */ | |
1510 | if (displaced == NULL) | |
1511 | return; | |
237fc4c9 PA |
1512 | |
1513 | /* Was this event for the pid we displaced? */ | |
fc1cf338 PA |
1514 | if (ptid_equal (displaced->step_ptid, null_ptid) |
1515 | || ! ptid_equal (displaced->step_ptid, event_ptid)) | |
237fc4c9 PA |
1516 | return; |
1517 | ||
fc1cf338 | 1518 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 | 1519 | |
e2d96639 | 1520 | displaced_step_restore (displaced, displaced->step_ptid); |
237fc4c9 PA |
1521 | |
1522 | /* Did the instruction complete successfully? */ | |
a493e3e2 | 1523 | if (signal == GDB_SIGNAL_TRAP) |
237fc4c9 PA |
1524 | { |
1525 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
1526 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
1527 | displaced->step_closure, | |
1528 | displaced->step_original, | |
1529 | displaced->step_copy, | |
1530 | get_thread_regcache (displaced->step_ptid)); | |
237fc4c9 PA |
1531 | } |
1532 | else | |
1533 | { | |
1534 | /* Since the instruction didn't complete, all we can do is | |
1535 | relocate the PC. */ | |
515630c5 UW |
1536 | struct regcache *regcache = get_thread_regcache (event_ptid); |
1537 | CORE_ADDR pc = regcache_read_pc (regcache); | |
abbb1732 | 1538 | |
fc1cf338 | 1539 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1540 | regcache_write_pc (regcache, pc); |
237fc4c9 PA |
1541 | } |
1542 | ||
1543 | do_cleanups (old_cleanups); | |
1544 | ||
fc1cf338 | 1545 | displaced->step_ptid = null_ptid; |
1c5cfe86 | 1546 | |
237fc4c9 | 1547 | /* Are there any pending displaced stepping requests? If so, run |
fc1cf338 PA |
1548 | one now. Leave the state object around, since we're likely to |
1549 | need it again soon. */ | |
1550 | while (displaced->step_request_queue) | |
237fc4c9 PA |
1551 | { |
1552 | struct displaced_step_request *head; | |
1553 | ptid_t ptid; | |
5af949e3 | 1554 | struct regcache *regcache; |
929dfd4f | 1555 | struct gdbarch *gdbarch; |
1c5cfe86 | 1556 | CORE_ADDR actual_pc; |
6c95b8df | 1557 | struct address_space *aspace; |
237fc4c9 | 1558 | |
fc1cf338 | 1559 | head = displaced->step_request_queue; |
237fc4c9 | 1560 | ptid = head->ptid; |
fc1cf338 | 1561 | displaced->step_request_queue = head->next; |
237fc4c9 PA |
1562 | xfree (head); |
1563 | ||
ad53cd71 PA |
1564 | context_switch (ptid); |
1565 | ||
5af949e3 UW |
1566 | regcache = get_thread_regcache (ptid); |
1567 | actual_pc = regcache_read_pc (regcache); | |
6c95b8df | 1568 | aspace = get_regcache_aspace (regcache); |
1c5cfe86 | 1569 | |
6c95b8df | 1570 | if (breakpoint_here_p (aspace, actual_pc)) |
ad53cd71 | 1571 | { |
1c5cfe86 PA |
1572 | if (debug_displaced) |
1573 | fprintf_unfiltered (gdb_stdlog, | |
1574 | "displaced: stepping queued %s now\n", | |
1575 | target_pid_to_str (ptid)); | |
1576 | ||
1577 | displaced_step_prepare (ptid); | |
1578 | ||
929dfd4f JB |
1579 | gdbarch = get_regcache_arch (regcache); |
1580 | ||
1c5cfe86 PA |
1581 | if (debug_displaced) |
1582 | { | |
929dfd4f | 1583 | CORE_ADDR actual_pc = regcache_read_pc (regcache); |
1c5cfe86 PA |
1584 | gdb_byte buf[4]; |
1585 | ||
5af949e3 UW |
1586 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", |
1587 | paddress (gdbarch, actual_pc)); | |
1c5cfe86 PA |
1588 | read_memory (actual_pc, buf, sizeof (buf)); |
1589 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1590 | } | |
1591 | ||
fc1cf338 PA |
1592 | if (gdbarch_displaced_step_hw_singlestep (gdbarch, |
1593 | displaced->step_closure)) | |
a493e3e2 | 1594 | target_resume (ptid, 1, GDB_SIGNAL_0); |
99e40580 | 1595 | else |
a493e3e2 | 1596 | target_resume (ptid, 0, GDB_SIGNAL_0); |
1c5cfe86 PA |
1597 | |
1598 | /* Done, we're stepping a thread. */ | |
1599 | break; | |
ad53cd71 | 1600 | } |
1c5cfe86 PA |
1601 | else |
1602 | { | |
1603 | int step; | |
1604 | struct thread_info *tp = inferior_thread (); | |
1605 | ||
1606 | /* The breakpoint we were sitting under has since been | |
1607 | removed. */ | |
16c381f0 | 1608 | tp->control.trap_expected = 0; |
1c5cfe86 PA |
1609 | |
1610 | /* Go back to what we were trying to do. */ | |
1611 | step = currently_stepping (tp); | |
ad53cd71 | 1612 | |
1c5cfe86 | 1613 | if (debug_displaced) |
3e43a32a | 1614 | fprintf_unfiltered (gdb_stdlog, |
27d2932e | 1615 | "displaced: breakpoint is gone: %s, step(%d)\n", |
1c5cfe86 PA |
1616 | target_pid_to_str (tp->ptid), step); |
1617 | ||
a493e3e2 PA |
1618 | target_resume (ptid, step, GDB_SIGNAL_0); |
1619 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
1c5cfe86 PA |
1620 | |
1621 | /* This request was discarded. See if there's any other | |
1622 | thread waiting for its turn. */ | |
1623 | } | |
237fc4c9 PA |
1624 | } |
1625 | } | |
1626 | ||
5231c1fd PA |
1627 | /* Update global variables holding ptids to hold NEW_PTID if they were |
1628 | holding OLD_PTID. */ | |
1629 | static void | |
1630 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
1631 | { | |
1632 | struct displaced_step_request *it; | |
fc1cf338 | 1633 | struct displaced_step_inferior_state *displaced; |
5231c1fd PA |
1634 | |
1635 | if (ptid_equal (inferior_ptid, old_ptid)) | |
1636 | inferior_ptid = new_ptid; | |
1637 | ||
1638 | if (ptid_equal (singlestep_ptid, old_ptid)) | |
1639 | singlestep_ptid = new_ptid; | |
1640 | ||
fc1cf338 PA |
1641 | for (displaced = displaced_step_inferior_states; |
1642 | displaced; | |
1643 | displaced = displaced->next) | |
1644 | { | |
1645 | if (ptid_equal (displaced->step_ptid, old_ptid)) | |
1646 | displaced->step_ptid = new_ptid; | |
1647 | ||
1648 | for (it = displaced->step_request_queue; it; it = it->next) | |
1649 | if (ptid_equal (it->ptid, old_ptid)) | |
1650 | it->ptid = new_ptid; | |
1651 | } | |
5231c1fd PA |
1652 | } |
1653 | ||
237fc4c9 PA |
1654 | \f |
1655 | /* Resuming. */ | |
c906108c SS |
1656 | |
1657 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 1658 | static void |
74b7792f | 1659 | resume_cleanups (void *ignore) |
c906108c SS |
1660 | { |
1661 | normal_stop (); | |
1662 | } | |
1663 | ||
53904c9e AC |
1664 | static const char schedlock_off[] = "off"; |
1665 | static const char schedlock_on[] = "on"; | |
1666 | static const char schedlock_step[] = "step"; | |
40478521 | 1667 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
1668 | schedlock_off, |
1669 | schedlock_on, | |
1670 | schedlock_step, | |
1671 | NULL | |
1672 | }; | |
920d2a44 AC |
1673 | static const char *scheduler_mode = schedlock_off; |
1674 | static void | |
1675 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
1676 | struct cmd_list_element *c, const char *value) | |
1677 | { | |
3e43a32a MS |
1678 | fprintf_filtered (file, |
1679 | _("Mode for locking scheduler " | |
1680 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
1681 | value); |
1682 | } | |
c906108c SS |
1683 | |
1684 | static void | |
96baa820 | 1685 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 1686 | { |
eefe576e AC |
1687 | if (!target_can_lock_scheduler) |
1688 | { | |
1689 | scheduler_mode = schedlock_off; | |
1690 | error (_("Target '%s' cannot support this command."), target_shortname); | |
1691 | } | |
c906108c SS |
1692 | } |
1693 | ||
d4db2f36 PA |
1694 | /* True if execution commands resume all threads of all processes by |
1695 | default; otherwise, resume only threads of the current inferior | |
1696 | process. */ | |
1697 | int sched_multi = 0; | |
1698 | ||
2facfe5c DD |
1699 | /* Try to setup for software single stepping over the specified location. |
1700 | Return 1 if target_resume() should use hardware single step. | |
1701 | ||
1702 | GDBARCH the current gdbarch. | |
1703 | PC the location to step over. */ | |
1704 | ||
1705 | static int | |
1706 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1707 | { | |
1708 | int hw_step = 1; | |
1709 | ||
f02253f1 HZ |
1710 | if (execution_direction == EXEC_FORWARD |
1711 | && gdbarch_software_single_step_p (gdbarch) | |
99e40580 | 1712 | && gdbarch_software_single_step (gdbarch, get_current_frame ())) |
2facfe5c | 1713 | { |
99e40580 UW |
1714 | hw_step = 0; |
1715 | /* Do not pull these breakpoints until after a `wait' in | |
1777feb0 | 1716 | `wait_for_inferior'. */ |
99e40580 UW |
1717 | singlestep_breakpoints_inserted_p = 1; |
1718 | singlestep_ptid = inferior_ptid; | |
1719 | singlestep_pc = pc; | |
2facfe5c DD |
1720 | } |
1721 | return hw_step; | |
1722 | } | |
c906108c | 1723 | |
09cee04b PA |
1724 | /* Return a ptid representing the set of threads that we will proceed, |
1725 | in the perspective of the user/frontend. We may actually resume | |
1726 | fewer threads at first, e.g., if a thread is stopped at a | |
b136cd05 PA |
1727 | breakpoint that needs stepping-off, but that should not be visible |
1728 | to the user/frontend, and neither should the frontend/user be | |
1729 | allowed to proceed any of the threads that happen to be stopped for | |
09cee04b PA |
1730 | internal run control handling, if a previous command wanted them |
1731 | resumed. */ | |
1732 | ||
1733 | ptid_t | |
1734 | user_visible_resume_ptid (int step) | |
1735 | { | |
1736 | /* By default, resume all threads of all processes. */ | |
1737 | ptid_t resume_ptid = RESUME_ALL; | |
1738 | ||
1739 | /* Maybe resume only all threads of the current process. */ | |
1740 | if (!sched_multi && target_supports_multi_process ()) | |
1741 | { | |
1742 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
1743 | } | |
1744 | ||
1745 | /* Maybe resume a single thread after all. */ | |
1746 | if (non_stop) | |
1747 | { | |
1748 | /* With non-stop mode on, threads are always handled | |
1749 | individually. */ | |
1750 | resume_ptid = inferior_ptid; | |
1751 | } | |
1752 | else if ((scheduler_mode == schedlock_on) | |
1753 | || (scheduler_mode == schedlock_step | |
1754 | && (step || singlestep_breakpoints_inserted_p))) | |
1755 | { | |
1756 | /* User-settable 'scheduler' mode requires solo thread resume. */ | |
1757 | resume_ptid = inferior_ptid; | |
1758 | } | |
1759 | ||
1760 | return resume_ptid; | |
1761 | } | |
1762 | ||
c906108c SS |
1763 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
1764 | wants to interrupt some lengthy single-stepping operation | |
1765 | (for child processes, the SIGINT goes to the inferior, and so | |
1766 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
1767 | other targets, that's not true). | |
1768 | ||
1769 | STEP nonzero if we should step (zero to continue instead). | |
1770 | SIG is the signal to give the inferior (zero for none). */ | |
1771 | void | |
2ea28649 | 1772 | resume (int step, enum gdb_signal sig) |
c906108c SS |
1773 | { |
1774 | int should_resume = 1; | |
74b7792f | 1775 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
1776 | struct regcache *regcache = get_current_regcache (); |
1777 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4e1c45ea | 1778 | struct thread_info *tp = inferior_thread (); |
515630c5 | 1779 | CORE_ADDR pc = regcache_read_pc (regcache); |
6c95b8df | 1780 | struct address_space *aspace = get_regcache_aspace (regcache); |
c7e8a53c | 1781 | |
c906108c SS |
1782 | QUIT; |
1783 | ||
74609e71 YQ |
1784 | if (current_inferior ()->waiting_for_vfork_done) |
1785 | { | |
48f9886d PA |
1786 | /* Don't try to single-step a vfork parent that is waiting for |
1787 | the child to get out of the shared memory region (by exec'ing | |
1788 | or exiting). This is particularly important on software | |
1789 | single-step archs, as the child process would trip on the | |
1790 | software single step breakpoint inserted for the parent | |
1791 | process. Since the parent will not actually execute any | |
1792 | instruction until the child is out of the shared region (such | |
1793 | are vfork's semantics), it is safe to simply continue it. | |
1794 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
1795 | the parent, and tell it to `keep_going', which automatically | |
1796 | re-sets it stepping. */ | |
74609e71 YQ |
1797 | if (debug_infrun) |
1798 | fprintf_unfiltered (gdb_stdlog, | |
1799 | "infrun: resume : clear step\n"); | |
1800 | step = 0; | |
1801 | } | |
1802 | ||
527159b7 | 1803 | if (debug_infrun) |
237fc4c9 | 1804 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 1805 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 1806 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
1807 | step, gdb_signal_to_symbol_string (sig), |
1808 | tp->control.trap_expected, | |
0d9a9a5f PA |
1809 | target_pid_to_str (inferior_ptid), |
1810 | paddress (gdbarch, pc)); | |
c906108c | 1811 | |
c2c6d25f JM |
1812 | /* Normally, by the time we reach `resume', the breakpoints are either |
1813 | removed or inserted, as appropriate. The exception is if we're sitting | |
1814 | at a permanent breakpoint; we need to step over it, but permanent | |
1815 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 1816 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 1817 | { |
515630c5 UW |
1818 | if (gdbarch_skip_permanent_breakpoint_p (gdbarch)) |
1819 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
6d350bb5 | 1820 | else |
ac74f770 MS |
1821 | error (_("\ |
1822 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
1823 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
1824 | a command like `return' or `jump' to continue execution.")); | |
6d350bb5 | 1825 | } |
c2c6d25f | 1826 | |
c1e36e3e PA |
1827 | /* If we have a breakpoint to step over, make sure to do a single |
1828 | step only. Same if we have software watchpoints. */ | |
1829 | if (tp->control.trap_expected || bpstat_should_step ()) | |
1830 | tp->control.may_range_step = 0; | |
1831 | ||
237fc4c9 PA |
1832 | /* If enabled, step over breakpoints by executing a copy of the |
1833 | instruction at a different address. | |
1834 | ||
1835 | We can't use displaced stepping when we have a signal to deliver; | |
1836 | the comments for displaced_step_prepare explain why. The | |
1837 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
1838 | signals' explain what we do instead. |
1839 | ||
1840 | We can't use displaced stepping when we are waiting for vfork_done | |
1841 | event, displaced stepping breaks the vfork child similarly as single | |
1842 | step software breakpoint. */ | |
515630c5 | 1843 | if (use_displaced_stepping (gdbarch) |
16c381f0 | 1844 | && (tp->control.trap_expected |
929dfd4f | 1845 | || (step && gdbarch_software_single_step_p (gdbarch))) |
a493e3e2 | 1846 | && sig == GDB_SIGNAL_0 |
74609e71 | 1847 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 1848 | { |
fc1cf338 PA |
1849 | struct displaced_step_inferior_state *displaced; |
1850 | ||
237fc4c9 | 1851 | if (!displaced_step_prepare (inferior_ptid)) |
d56b7306 VP |
1852 | { |
1853 | /* Got placed in displaced stepping queue. Will be resumed | |
1854 | later when all the currently queued displaced stepping | |
7f7efbd9 VP |
1855 | requests finish. The thread is not executing at this point, |
1856 | and the call to set_executing will be made later. But we | |
1857 | need to call set_running here, since from frontend point of view, | |
1858 | the thread is running. */ | |
1859 | set_running (inferior_ptid, 1); | |
d56b7306 VP |
1860 | discard_cleanups (old_cleanups); |
1861 | return; | |
1862 | } | |
99e40580 | 1863 | |
ca7781d2 LM |
1864 | /* Update pc to reflect the new address from which we will execute |
1865 | instructions due to displaced stepping. */ | |
1866 | pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); | |
1867 | ||
fc1cf338 PA |
1868 | displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); |
1869 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, | |
1870 | displaced->step_closure); | |
237fc4c9 PA |
1871 | } |
1872 | ||
2facfe5c | 1873 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 1874 | else if (step) |
2facfe5c | 1875 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 1876 | |
30852783 UW |
1877 | /* Currently, our software single-step implementation leads to different |
1878 | results than hardware single-stepping in one situation: when stepping | |
1879 | into delivering a signal which has an associated signal handler, | |
1880 | hardware single-step will stop at the first instruction of the handler, | |
1881 | while software single-step will simply skip execution of the handler. | |
1882 | ||
1883 | For now, this difference in behavior is accepted since there is no | |
1884 | easy way to actually implement single-stepping into a signal handler | |
1885 | without kernel support. | |
1886 | ||
1887 | However, there is one scenario where this difference leads to follow-on | |
1888 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
1889 | and then single-stepping. In this case, the software single-step | |
1890 | behavior means that even if there is a *breakpoint* in the signal | |
1891 | handler, GDB still would not stop. | |
1892 | ||
1893 | Fortunately, we can at least fix this particular issue. We detect | |
1894 | here the case where we are about to deliver a signal while software | |
1895 | single-stepping with breakpoints removed. In this situation, we | |
1896 | revert the decisions to remove all breakpoints and insert single- | |
1897 | step breakpoints, and instead we install a step-resume breakpoint | |
1898 | at the current address, deliver the signal without stepping, and | |
1899 | once we arrive back at the step-resume breakpoint, actually step | |
1900 | over the breakpoint we originally wanted to step over. */ | |
1901 | if (singlestep_breakpoints_inserted_p | |
a493e3e2 | 1902 | && tp->control.trap_expected && sig != GDB_SIGNAL_0) |
30852783 UW |
1903 | { |
1904 | /* If we have nested signals or a pending signal is delivered | |
1905 | immediately after a handler returns, might might already have | |
1906 | a step-resume breakpoint set on the earlier handler. We cannot | |
1907 | set another step-resume breakpoint; just continue on until the | |
1908 | original breakpoint is hit. */ | |
1909 | if (tp->control.step_resume_breakpoint == NULL) | |
1910 | { | |
2c03e5be | 1911 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
1912 | tp->step_after_step_resume_breakpoint = 1; |
1913 | } | |
1914 | ||
1915 | remove_single_step_breakpoints (); | |
1916 | singlestep_breakpoints_inserted_p = 0; | |
1917 | ||
31e77af2 | 1918 | clear_step_over_info (); |
30852783 | 1919 | tp->control.trap_expected = 0; |
31e77af2 PA |
1920 | |
1921 | insert_breakpoints (); | |
30852783 UW |
1922 | } |
1923 | ||
c906108c SS |
1924 | if (should_resume) |
1925 | { | |
39f77062 | 1926 | ptid_t resume_ptid; |
dfcd3bfb | 1927 | |
cd76b0b7 VP |
1928 | /* If STEP is set, it's a request to use hardware stepping |
1929 | facilities. But in that case, we should never | |
1930 | use singlestep breakpoint. */ | |
1931 | gdb_assert (!(singlestep_breakpoints_inserted_p && step)); | |
1932 | ||
d4db2f36 PA |
1933 | /* Decide the set of threads to ask the target to resume. Start |
1934 | by assuming everything will be resumed, than narrow the set | |
1935 | by applying increasingly restricting conditions. */ | |
09cee04b | 1936 | resume_ptid = user_visible_resume_ptid (step); |
d4db2f36 PA |
1937 | |
1938 | /* Maybe resume a single thread after all. */ | |
2adfaa28 PA |
1939 | if ((step || singlestep_breakpoints_inserted_p) |
1940 | && tp->control.trap_expected) | |
cd76b0b7 | 1941 | { |
74960c60 VP |
1942 | /* We're allowing a thread to run past a breakpoint it has |
1943 | hit, by single-stepping the thread with the breakpoint | |
1944 | removed. In which case, we need to single-step only this | |
1945 | thread, and keep others stopped, as they can miss this | |
31e77af2 | 1946 | breakpoint if allowed to run. */ |
ef5cf84e | 1947 | resume_ptid = inferior_ptid; |
c906108c | 1948 | } |
ef5cf84e | 1949 | |
515630c5 | 1950 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4ed33b9 AC |
1951 | { |
1952 | /* Most targets can step a breakpoint instruction, thus | |
1953 | executing it normally. But if this one cannot, just | |
1954 | continue and we will hit it anyway. */ | |
6c95b8df | 1955 | if (step && breakpoint_inserted_here_p (aspace, pc)) |
c4ed33b9 AC |
1956 | step = 0; |
1957 | } | |
237fc4c9 PA |
1958 | |
1959 | if (debug_displaced | |
515630c5 | 1960 | && use_displaced_stepping (gdbarch) |
16c381f0 | 1961 | && tp->control.trap_expected) |
237fc4c9 | 1962 | { |
515630c5 | 1963 | struct regcache *resume_regcache = get_thread_regcache (resume_ptid); |
5af949e3 | 1964 | struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache); |
515630c5 | 1965 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
237fc4c9 PA |
1966 | gdb_byte buf[4]; |
1967 | ||
5af949e3 UW |
1968 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", |
1969 | paddress (resume_gdbarch, actual_pc)); | |
237fc4c9 PA |
1970 | read_memory (actual_pc, buf, sizeof (buf)); |
1971 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1972 | } | |
1973 | ||
c1e36e3e PA |
1974 | if (tp->control.may_range_step) |
1975 | { | |
1976 | /* If we're resuming a thread with the PC out of the step | |
1977 | range, then we're doing some nested/finer run control | |
1978 | operation, like stepping the thread out of the dynamic | |
1979 | linker or the displaced stepping scratch pad. We | |
1980 | shouldn't have allowed a range step then. */ | |
1981 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
1982 | } | |
1983 | ||
e58b0e63 PA |
1984 | /* Install inferior's terminal modes. */ |
1985 | target_terminal_inferior (); | |
1986 | ||
2020b7ab PA |
1987 | /* Avoid confusing the next resume, if the next stop/resume |
1988 | happens to apply to another thread. */ | |
a493e3e2 | 1989 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
607cecd2 | 1990 | |
2455069d UW |
1991 | /* Advise target which signals may be handled silently. If we have |
1992 | removed breakpoints because we are stepping over one (which can | |
1993 | happen only if we are not using displaced stepping), we need to | |
1994 | receive all signals to avoid accidentally skipping a breakpoint | |
1995 | during execution of a signal handler. */ | |
1996 | if ((step || singlestep_breakpoints_inserted_p) | |
1997 | && tp->control.trap_expected | |
1998 | && !use_displaced_stepping (gdbarch)) | |
1999 | target_pass_signals (0, NULL); | |
2000 | else | |
a493e3e2 | 2001 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); |
2455069d | 2002 | |
607cecd2 | 2003 | target_resume (resume_ptid, step, sig); |
c906108c SS |
2004 | } |
2005 | ||
2006 | discard_cleanups (old_cleanups); | |
2007 | } | |
2008 | \f | |
237fc4c9 | 2009 | /* Proceeding. */ |
c906108c SS |
2010 | |
2011 | /* Clear out all variables saying what to do when inferior is continued. | |
2012 | First do this, then set the ones you want, then call `proceed'. */ | |
2013 | ||
a7212384 UW |
2014 | static void |
2015 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2016 | { |
a7212384 UW |
2017 | if (debug_infrun) |
2018 | fprintf_unfiltered (gdb_stdlog, | |
2019 | "infrun: clear_proceed_status_thread (%s)\n", | |
2020 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 2021 | |
16c381f0 JK |
2022 | tp->control.trap_expected = 0; |
2023 | tp->control.step_range_start = 0; | |
2024 | tp->control.step_range_end = 0; | |
c1e36e3e | 2025 | tp->control.may_range_step = 0; |
16c381f0 JK |
2026 | tp->control.step_frame_id = null_frame_id; |
2027 | tp->control.step_stack_frame_id = null_frame_id; | |
2028 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
a7212384 | 2029 | tp->stop_requested = 0; |
4e1c45ea | 2030 | |
16c381f0 | 2031 | tp->control.stop_step = 0; |
32400beb | 2032 | |
16c381f0 | 2033 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2034 | |
a7212384 | 2035 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2036 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2037 | } |
32400beb | 2038 | |
a7212384 UW |
2039 | static int |
2040 | clear_proceed_status_callback (struct thread_info *tp, void *data) | |
2041 | { | |
2042 | if (is_exited (tp->ptid)) | |
2043 | return 0; | |
d6b48e9c | 2044 | |
a7212384 UW |
2045 | clear_proceed_status_thread (tp); |
2046 | return 0; | |
2047 | } | |
2048 | ||
2049 | void | |
2050 | clear_proceed_status (void) | |
2051 | { | |
6c95b8df PA |
2052 | if (!non_stop) |
2053 | { | |
2054 | /* In all-stop mode, delete the per-thread status of all | |
2055 | threads, even if inferior_ptid is null_ptid, there may be | |
2056 | threads on the list. E.g., we may be launching a new | |
2057 | process, while selecting the executable. */ | |
2058 | iterate_over_threads (clear_proceed_status_callback, NULL); | |
2059 | } | |
2060 | ||
a7212384 UW |
2061 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2062 | { | |
2063 | struct inferior *inferior; | |
2064 | ||
2065 | if (non_stop) | |
2066 | { | |
6c95b8df PA |
2067 | /* If in non-stop mode, only delete the per-thread status of |
2068 | the current thread. */ | |
a7212384 UW |
2069 | clear_proceed_status_thread (inferior_thread ()); |
2070 | } | |
6c95b8df | 2071 | |
d6b48e9c | 2072 | inferior = current_inferior (); |
16c381f0 | 2073 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2074 | } |
2075 | ||
c906108c | 2076 | stop_after_trap = 0; |
f3b1572e | 2077 | |
31e77af2 PA |
2078 | clear_step_over_info (); |
2079 | ||
f3b1572e | 2080 | observer_notify_about_to_proceed (); |
c906108c | 2081 | |
d5c31457 UW |
2082 | if (stop_registers) |
2083 | { | |
2084 | regcache_xfree (stop_registers); | |
2085 | stop_registers = NULL; | |
2086 | } | |
c906108c SS |
2087 | } |
2088 | ||
99619bea PA |
2089 | /* Returns true if TP is still stopped at a breakpoint that needs |
2090 | stepping-over in order to make progress. If the breakpoint is gone | |
2091 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2092 | |
2093 | static int | |
99619bea PA |
2094 | thread_still_needs_step_over (struct thread_info *tp) |
2095 | { | |
2096 | if (tp->stepping_over_breakpoint) | |
2097 | { | |
2098 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
2099 | ||
2100 | if (breakpoint_here_p (get_regcache_aspace (regcache), | |
2101 | regcache_read_pc (regcache))) | |
2102 | return 1; | |
2103 | ||
2104 | tp->stepping_over_breakpoint = 0; | |
2105 | } | |
2106 | ||
2107 | return 0; | |
2108 | } | |
2109 | ||
2110 | /* Look a thread other than EXCEPT that has previously reported a | |
2111 | breakpoint event, and thus needs a step-over in order to make | |
2112 | progress. Returns NULL is none is found. STEP indicates whether | |
2113 | we're about to step the current thread, in order to decide whether | |
2114 | "set scheduler-locking step" applies. */ | |
2115 | ||
2116 | static struct thread_info * | |
2117 | find_thread_needs_step_over (int step, struct thread_info *except) | |
ea67f13b | 2118 | { |
5a437975 | 2119 | int schedlock_enabled; |
99619bea | 2120 | struct thread_info *tp, *current; |
5a437975 DE |
2121 | |
2122 | /* With non-stop mode on, threads are always handled individually. */ | |
2123 | gdb_assert (! non_stop); | |
ea67f13b | 2124 | |
5a437975 DE |
2125 | schedlock_enabled = (scheduler_mode == schedlock_on |
2126 | || (scheduler_mode == schedlock_step | |
2127 | && step)); | |
2128 | ||
99619bea | 2129 | current = inferior_thread (); |
d4db2f36 | 2130 | |
99619bea PA |
2131 | /* If scheduler locking applies, we can avoid iterating over all |
2132 | threads. */ | |
2133 | if (schedlock_enabled) | |
ea67f13b | 2134 | { |
99619bea PA |
2135 | if (except != current |
2136 | && thread_still_needs_step_over (current)) | |
2137 | return current; | |
515630c5 | 2138 | |
99619bea PA |
2139 | return NULL; |
2140 | } | |
0d9a9a5f | 2141 | |
99619bea PA |
2142 | ALL_THREADS (tp) |
2143 | { | |
2144 | /* Ignore the EXCEPT thread. */ | |
2145 | if (tp == except) | |
2146 | continue; | |
2147 | /* Ignore threads of processes we're not resuming. */ | |
2148 | if (!sched_multi | |
2149 | && ptid_get_pid (tp->ptid) != ptid_get_pid (inferior_ptid)) | |
2150 | continue; | |
2151 | ||
2152 | if (thread_still_needs_step_over (tp)) | |
2153 | return tp; | |
ea67f13b DJ |
2154 | } |
2155 | ||
99619bea | 2156 | return NULL; |
ea67f13b | 2157 | } |
e4846b08 | 2158 | |
c906108c SS |
2159 | /* Basic routine for continuing the program in various fashions. |
2160 | ||
2161 | ADDR is the address to resume at, or -1 for resume where stopped. | |
2162 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 2163 | or -1 for act according to how it stopped. |
c906108c | 2164 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
2165 | -1 means return after that and print nothing. |
2166 | You should probably set various step_... variables | |
2167 | before calling here, if you are stepping. | |
c906108c SS |
2168 | |
2169 | You should call clear_proceed_status before calling proceed. */ | |
2170 | ||
2171 | void | |
2ea28649 | 2172 | proceed (CORE_ADDR addr, enum gdb_signal siggnal, int step) |
c906108c | 2173 | { |
e58b0e63 PA |
2174 | struct regcache *regcache; |
2175 | struct gdbarch *gdbarch; | |
4e1c45ea | 2176 | struct thread_info *tp; |
e58b0e63 | 2177 | CORE_ADDR pc; |
6c95b8df | 2178 | struct address_space *aspace; |
c906108c | 2179 | |
e58b0e63 PA |
2180 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2181 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2182 | resuming the current thread. */ | |
2183 | if (!follow_fork ()) | |
2184 | { | |
2185 | /* The target for some reason decided not to resume. */ | |
2186 | normal_stop (); | |
f148b27e PA |
2187 | if (target_can_async_p ()) |
2188 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2189 | return; |
2190 | } | |
2191 | ||
842951eb PA |
2192 | /* We'll update this if & when we switch to a new thread. */ |
2193 | previous_inferior_ptid = inferior_ptid; | |
2194 | ||
e58b0e63 PA |
2195 | regcache = get_current_regcache (); |
2196 | gdbarch = get_regcache_arch (regcache); | |
6c95b8df | 2197 | aspace = get_regcache_aspace (regcache); |
e58b0e63 | 2198 | pc = regcache_read_pc (regcache); |
2adfaa28 | 2199 | tp = inferior_thread (); |
e58b0e63 | 2200 | |
c906108c | 2201 | if (step > 0) |
515630c5 | 2202 | step_start_function = find_pc_function (pc); |
c906108c SS |
2203 | if (step < 0) |
2204 | stop_after_trap = 1; | |
2205 | ||
99619bea PA |
2206 | /* Fill in with reasonable starting values. */ |
2207 | init_thread_stepping_state (tp); | |
2208 | ||
2acceee2 | 2209 | if (addr == (CORE_ADDR) -1) |
c906108c | 2210 | { |
6c95b8df | 2211 | if (pc == stop_pc && breakpoint_here_p (aspace, pc) |
b2175913 | 2212 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2213 | /* There is a breakpoint at the address we will resume at, |
2214 | step one instruction before inserting breakpoints so that | |
2215 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2216 | breakpoint). |
2217 | ||
2218 | Note, we don't do this in reverse, because we won't | |
2219 | actually be executing the breakpoint insn anyway. | |
2220 | We'll be (un-)executing the previous instruction. */ | |
99619bea | 2221 | tp->stepping_over_breakpoint = 1; |
515630c5 UW |
2222 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2223 | && gdbarch_single_step_through_delay (gdbarch, | |
2224 | get_current_frame ())) | |
3352ef37 AC |
2225 | /* We stepped onto an instruction that needs to be stepped |
2226 | again before re-inserting the breakpoint, do so. */ | |
99619bea | 2227 | tp->stepping_over_breakpoint = 1; |
c906108c SS |
2228 | } |
2229 | else | |
2230 | { | |
515630c5 | 2231 | regcache_write_pc (regcache, addr); |
c906108c SS |
2232 | } |
2233 | ||
527159b7 | 2234 | if (debug_infrun) |
8a9de0e4 | 2235 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 PA |
2236 | "infrun: proceed (addr=%s, signal=%s, step=%d)\n", |
2237 | paddress (gdbarch, addr), | |
2238 | gdb_signal_to_symbol_string (siggnal), step); | |
527159b7 | 2239 | |
94cc34af PA |
2240 | if (non_stop) |
2241 | /* In non-stop, each thread is handled individually. The context | |
2242 | must already be set to the right thread here. */ | |
2243 | ; | |
2244 | else | |
2245 | { | |
99619bea PA |
2246 | struct thread_info *step_over; |
2247 | ||
94cc34af PA |
2248 | /* In a multi-threaded task we may select another thread and |
2249 | then continue or step. | |
c906108c | 2250 | |
94cc34af PA |
2251 | But if the old thread was stopped at a breakpoint, it will |
2252 | immediately cause another breakpoint stop without any | |
2253 | execution (i.e. it will report a breakpoint hit incorrectly). | |
2254 | So we must step over it first. | |
c906108c | 2255 | |
99619bea PA |
2256 | Look for a thread other than the current (TP) that reported a |
2257 | breakpoint hit and hasn't been resumed yet since. */ | |
2258 | step_over = find_thread_needs_step_over (step, tp); | |
2259 | if (step_over != NULL) | |
2adfaa28 | 2260 | { |
99619bea PA |
2261 | if (debug_infrun) |
2262 | fprintf_unfiltered (gdb_stdlog, | |
2263 | "infrun: need to step-over [%s] first\n", | |
2264 | target_pid_to_str (step_over->ptid)); | |
2265 | ||
2266 | /* Store the prev_pc for the stepping thread too, needed by | |
2267 | switch_back_to_stepping thread. */ | |
2268 | tp->prev_pc = regcache_read_pc (get_current_regcache ()); | |
2269 | switch_to_thread (step_over->ptid); | |
2270 | tp = step_over; | |
2adfaa28 | 2271 | } |
94cc34af | 2272 | } |
c906108c | 2273 | |
31e77af2 PA |
2274 | /* If we need to step over a breakpoint, and we're not using |
2275 | displaced stepping to do so, insert all breakpoints (watchpoints, | |
2276 | etc.) but the one we're stepping over, step one instruction, and | |
2277 | then re-insert the breakpoint when that step is finished. */ | |
99619bea | 2278 | if (tp->stepping_over_breakpoint && !use_displaced_stepping (gdbarch)) |
30852783 | 2279 | { |
31e77af2 PA |
2280 | struct regcache *regcache = get_current_regcache (); |
2281 | ||
2282 | set_step_over_info (get_regcache_aspace (regcache), | |
2283 | regcache_read_pc (regcache)); | |
30852783 | 2284 | } |
31e77af2 PA |
2285 | else |
2286 | clear_step_over_info (); | |
30852783 | 2287 | |
31e77af2 | 2288 | insert_breakpoints (); |
30852783 | 2289 | |
99619bea PA |
2290 | tp->control.trap_expected = tp->stepping_over_breakpoint; |
2291 | ||
2020b7ab PA |
2292 | if (!non_stop) |
2293 | { | |
2294 | /* Pass the last stop signal to the thread we're resuming, | |
2295 | irrespective of whether the current thread is the thread that | |
2296 | got the last event or not. This was historically GDB's | |
2297 | behaviour before keeping a stop_signal per thread. */ | |
2298 | ||
2299 | struct thread_info *last_thread; | |
2300 | ptid_t last_ptid; | |
2301 | struct target_waitstatus last_status; | |
2302 | ||
2303 | get_last_target_status (&last_ptid, &last_status); | |
2304 | if (!ptid_equal (inferior_ptid, last_ptid) | |
2305 | && !ptid_equal (last_ptid, null_ptid) | |
2306 | && !ptid_equal (last_ptid, minus_one_ptid)) | |
2307 | { | |
e09875d4 | 2308 | last_thread = find_thread_ptid (last_ptid); |
2020b7ab PA |
2309 | if (last_thread) |
2310 | { | |
16c381f0 | 2311 | tp->suspend.stop_signal = last_thread->suspend.stop_signal; |
a493e3e2 | 2312 | last_thread->suspend.stop_signal = GDB_SIGNAL_0; |
2020b7ab PA |
2313 | } |
2314 | } | |
2315 | } | |
2316 | ||
a493e3e2 | 2317 | if (siggnal != GDB_SIGNAL_DEFAULT) |
16c381f0 | 2318 | tp->suspend.stop_signal = siggnal; |
c906108c SS |
2319 | /* If this signal should not be seen by program, |
2320 | give it zero. Used for debugging signals. */ | |
16c381f0 | 2321 | else if (!signal_program[tp->suspend.stop_signal]) |
a493e3e2 | 2322 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
c906108c SS |
2323 | |
2324 | annotate_starting (); | |
2325 | ||
2326 | /* Make sure that output from GDB appears before output from the | |
2327 | inferior. */ | |
2328 | gdb_flush (gdb_stdout); | |
2329 | ||
e4846b08 JJ |
2330 | /* Refresh prev_pc value just prior to resuming. This used to be |
2331 | done in stop_stepping, however, setting prev_pc there did not handle | |
2332 | scenarios such as inferior function calls or returning from | |
2333 | a function via the return command. In those cases, the prev_pc | |
2334 | value was not set properly for subsequent commands. The prev_pc value | |
2335 | is used to initialize the starting line number in the ecs. With an | |
2336 | invalid value, the gdb next command ends up stopping at the position | |
2337 | represented by the next line table entry past our start position. | |
2338 | On platforms that generate one line table entry per line, this | |
2339 | is not a problem. However, on the ia64, the compiler generates | |
2340 | extraneous line table entries that do not increase the line number. | |
2341 | When we issue the gdb next command on the ia64 after an inferior call | |
2342 | or a return command, we often end up a few instructions forward, still | |
2343 | within the original line we started. | |
2344 | ||
d5cd6034 JB |
2345 | An attempt was made to refresh the prev_pc at the same time the |
2346 | execution_control_state is initialized (for instance, just before | |
2347 | waiting for an inferior event). But this approach did not work | |
2348 | because of platforms that use ptrace, where the pc register cannot | |
2349 | be read unless the inferior is stopped. At that point, we are not | |
2350 | guaranteed the inferior is stopped and so the regcache_read_pc() call | |
2351 | can fail. Setting the prev_pc value here ensures the value is updated | |
2352 | correctly when the inferior is stopped. */ | |
4e1c45ea | 2353 | tp->prev_pc = regcache_read_pc (get_current_regcache ()); |
e4846b08 | 2354 | |
59f0d5d9 PA |
2355 | /* Reset to normal state. */ |
2356 | init_infwait_state (); | |
2357 | ||
c906108c | 2358 | /* Resume inferior. */ |
99619bea | 2359 | resume (tp->control.trap_expected || step || bpstat_should_step (), |
0de5618e | 2360 | tp->suspend.stop_signal); |
c906108c SS |
2361 | |
2362 | /* Wait for it to stop (if not standalone) | |
2363 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 | 2364 | /* Do this only if we are not using the event loop, or if the target |
1777feb0 | 2365 | does not support asynchronous execution. */ |
362646f5 | 2366 | if (!target_can_async_p ()) |
43ff13b4 | 2367 | { |
e4c8541f | 2368 | wait_for_inferior (); |
43ff13b4 JM |
2369 | normal_stop (); |
2370 | } | |
c906108c | 2371 | } |
c906108c SS |
2372 | \f |
2373 | ||
2374 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 2375 | |
c906108c | 2376 | void |
8621d6a9 | 2377 | start_remote (int from_tty) |
c906108c | 2378 | { |
d6b48e9c | 2379 | struct inferior *inferior; |
d6b48e9c PA |
2380 | |
2381 | inferior = current_inferior (); | |
16c381f0 | 2382 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; |
43ff13b4 | 2383 | |
1777feb0 | 2384 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 2385 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 2386 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
2387 | nothing is returned (instead of just blocking). Because of this, |
2388 | targets expecting an immediate response need to, internally, set | |
2389 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 2390 | timeout. */ |
6426a772 JM |
2391 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
2392 | differentiate to its caller what the state of the target is after | |
2393 | the initial open has been performed. Here we're assuming that | |
2394 | the target has stopped. It should be possible to eventually have | |
2395 | target_open() return to the caller an indication that the target | |
2396 | is currently running and GDB state should be set to the same as | |
1777feb0 | 2397 | for an async run. */ |
e4c8541f | 2398 | wait_for_inferior (); |
8621d6a9 DJ |
2399 | |
2400 | /* Now that the inferior has stopped, do any bookkeeping like | |
2401 | loading shared libraries. We want to do this before normal_stop, | |
2402 | so that the displayed frame is up to date. */ | |
2403 | post_create_inferior (¤t_target, from_tty); | |
2404 | ||
6426a772 | 2405 | normal_stop (); |
c906108c SS |
2406 | } |
2407 | ||
2408 | /* Initialize static vars when a new inferior begins. */ | |
2409 | ||
2410 | void | |
96baa820 | 2411 | init_wait_for_inferior (void) |
c906108c SS |
2412 | { |
2413 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 2414 | |
c906108c SS |
2415 | breakpoint_init_inferior (inf_starting); |
2416 | ||
c906108c | 2417 | clear_proceed_status (); |
9f976b41 | 2418 | |
ca005067 | 2419 | target_last_wait_ptid = minus_one_ptid; |
237fc4c9 | 2420 | |
842951eb | 2421 | previous_inferior_ptid = inferior_ptid; |
0d1e5fa7 PA |
2422 | init_infwait_state (); |
2423 | ||
edb3359d DJ |
2424 | /* Discard any skipped inlined frames. */ |
2425 | clear_inline_frame_state (minus_one_ptid); | |
2adfaa28 PA |
2426 | |
2427 | singlestep_ptid = null_ptid; | |
2428 | singlestep_pc = 0; | |
c906108c | 2429 | } |
237fc4c9 | 2430 | |
c906108c | 2431 | \f |
b83266a0 SS |
2432 | /* This enum encodes possible reasons for doing a target_wait, so that |
2433 | wfi can call target_wait in one place. (Ultimately the call will be | |
2434 | moved out of the infinite loop entirely.) */ | |
2435 | ||
c5aa993b JM |
2436 | enum infwait_states |
2437 | { | |
cd0fc7c3 | 2438 | infwait_normal_state, |
d983da9c | 2439 | infwait_step_watch_state, |
cd0fc7c3 | 2440 | infwait_nonstep_watch_state |
b83266a0 SS |
2441 | }; |
2442 | ||
0d1e5fa7 PA |
2443 | /* The PTID we'll do a target_wait on.*/ |
2444 | ptid_t waiton_ptid; | |
2445 | ||
2446 | /* Current inferior wait state. */ | |
8870954f | 2447 | static enum infwait_states infwait_state; |
cd0fc7c3 | 2448 | |
0d1e5fa7 PA |
2449 | /* Data to be passed around while handling an event. This data is |
2450 | discarded between events. */ | |
c5aa993b | 2451 | struct execution_control_state |
488f131b | 2452 | { |
0d1e5fa7 | 2453 | ptid_t ptid; |
4e1c45ea PA |
2454 | /* The thread that got the event, if this was a thread event; NULL |
2455 | otherwise. */ | |
2456 | struct thread_info *event_thread; | |
2457 | ||
488f131b | 2458 | struct target_waitstatus ws; |
7e324e48 | 2459 | int stop_func_filled_in; |
488f131b JB |
2460 | CORE_ADDR stop_func_start; |
2461 | CORE_ADDR stop_func_end; | |
2c02bd72 | 2462 | const char *stop_func_name; |
488f131b | 2463 | int wait_some_more; |
4f5d7f63 PA |
2464 | |
2465 | /* We were in infwait_step_watch_state or | |
2466 | infwait_nonstep_watch_state state, and the thread reported an | |
2467 | event. */ | |
2468 | int stepped_after_stopped_by_watchpoint; | |
2adfaa28 PA |
2469 | |
2470 | /* True if the event thread hit the single-step breakpoint of | |
2471 | another thread. Thus the event doesn't cause a stop, the thread | |
2472 | needs to be single-stepped past the single-step breakpoint before | |
2473 | we can switch back to the original stepping thread. */ | |
2474 | int hit_singlestep_breakpoint; | |
488f131b JB |
2475 | }; |
2476 | ||
ec9499be | 2477 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 2478 | |
568d6575 UW |
2479 | static void handle_step_into_function (struct gdbarch *gdbarch, |
2480 | struct execution_control_state *ecs); | |
2481 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
2482 | struct execution_control_state *ecs); | |
4f5d7f63 | 2483 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 2484 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 2485 | struct frame_info *); |
611c83ae | 2486 | |
104c1213 JM |
2487 | static void stop_stepping (struct execution_control_state *ecs); |
2488 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 2489 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 2490 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 2491 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 2492 | |
252fbfc8 PA |
2493 | /* Callback for iterate over threads. If the thread is stopped, but |
2494 | the user/frontend doesn't know about that yet, go through | |
2495 | normal_stop, as if the thread had just stopped now. ARG points at | |
2496 | a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If | |
2497 | ptid_is_pid(PTID) is true, applies to all threads of the process | |
2498 | pointed at by PTID. Otherwise, apply only to the thread pointed by | |
2499 | PTID. */ | |
2500 | ||
2501 | static int | |
2502 | infrun_thread_stop_requested_callback (struct thread_info *info, void *arg) | |
2503 | { | |
2504 | ptid_t ptid = * (ptid_t *) arg; | |
2505 | ||
2506 | if ((ptid_equal (info->ptid, ptid) | |
2507 | || ptid_equal (minus_one_ptid, ptid) | |
2508 | || (ptid_is_pid (ptid) | |
2509 | && ptid_get_pid (ptid) == ptid_get_pid (info->ptid))) | |
2510 | && is_running (info->ptid) | |
2511 | && !is_executing (info->ptid)) | |
2512 | { | |
2513 | struct cleanup *old_chain; | |
2514 | struct execution_control_state ecss; | |
2515 | struct execution_control_state *ecs = &ecss; | |
2516 | ||
2517 | memset (ecs, 0, sizeof (*ecs)); | |
2518 | ||
2519 | old_chain = make_cleanup_restore_current_thread (); | |
2520 | ||
f15cb84a YQ |
2521 | overlay_cache_invalid = 1; |
2522 | /* Flush target cache before starting to handle each event. | |
2523 | Target was running and cache could be stale. This is just a | |
2524 | heuristic. Running threads may modify target memory, but we | |
2525 | don't get any event. */ | |
2526 | target_dcache_invalidate (); | |
2527 | ||
252fbfc8 PA |
2528 | /* Go through handle_inferior_event/normal_stop, so we always |
2529 | have consistent output as if the stop event had been | |
2530 | reported. */ | |
2531 | ecs->ptid = info->ptid; | |
e09875d4 | 2532 | ecs->event_thread = find_thread_ptid (info->ptid); |
252fbfc8 | 2533 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; |
a493e3e2 | 2534 | ecs->ws.value.sig = GDB_SIGNAL_0; |
252fbfc8 PA |
2535 | |
2536 | handle_inferior_event (ecs); | |
2537 | ||
2538 | if (!ecs->wait_some_more) | |
2539 | { | |
2540 | struct thread_info *tp; | |
2541 | ||
2542 | normal_stop (); | |
2543 | ||
fa4cd53f | 2544 | /* Finish off the continuations. */ |
252fbfc8 | 2545 | tp = inferior_thread (); |
fa4cd53f PA |
2546 | do_all_intermediate_continuations_thread (tp, 1); |
2547 | do_all_continuations_thread (tp, 1); | |
252fbfc8 PA |
2548 | } |
2549 | ||
2550 | do_cleanups (old_chain); | |
2551 | } | |
2552 | ||
2553 | return 0; | |
2554 | } | |
2555 | ||
2556 | /* This function is attached as a "thread_stop_requested" observer. | |
2557 | Cleanup local state that assumed the PTID was to be resumed, and | |
2558 | report the stop to the frontend. */ | |
2559 | ||
2c0b251b | 2560 | static void |
252fbfc8 PA |
2561 | infrun_thread_stop_requested (ptid_t ptid) |
2562 | { | |
fc1cf338 | 2563 | struct displaced_step_inferior_state *displaced; |
252fbfc8 PA |
2564 | |
2565 | /* PTID was requested to stop. Remove it from the displaced | |
2566 | stepping queue, so we don't try to resume it automatically. */ | |
fc1cf338 PA |
2567 | |
2568 | for (displaced = displaced_step_inferior_states; | |
2569 | displaced; | |
2570 | displaced = displaced->next) | |
252fbfc8 | 2571 | { |
fc1cf338 | 2572 | struct displaced_step_request *it, **prev_next_p; |
252fbfc8 | 2573 | |
fc1cf338 PA |
2574 | it = displaced->step_request_queue; |
2575 | prev_next_p = &displaced->step_request_queue; | |
2576 | while (it) | |
252fbfc8 | 2577 | { |
fc1cf338 PA |
2578 | if (ptid_match (it->ptid, ptid)) |
2579 | { | |
2580 | *prev_next_p = it->next; | |
2581 | it->next = NULL; | |
2582 | xfree (it); | |
2583 | } | |
252fbfc8 | 2584 | else |
fc1cf338 PA |
2585 | { |
2586 | prev_next_p = &it->next; | |
2587 | } | |
252fbfc8 | 2588 | |
fc1cf338 | 2589 | it = *prev_next_p; |
252fbfc8 | 2590 | } |
252fbfc8 PA |
2591 | } |
2592 | ||
2593 | iterate_over_threads (infrun_thread_stop_requested_callback, &ptid); | |
2594 | } | |
2595 | ||
a07daef3 PA |
2596 | static void |
2597 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
2598 | { | |
2599 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
2600 | nullify_last_target_wait_ptid (); | |
2601 | } | |
2602 | ||
4e1c45ea PA |
2603 | /* Callback for iterate_over_threads. */ |
2604 | ||
2605 | static int | |
2606 | delete_step_resume_breakpoint_callback (struct thread_info *info, void *data) | |
2607 | { | |
2608 | if (is_exited (info->ptid)) | |
2609 | return 0; | |
2610 | ||
2611 | delete_step_resume_breakpoint (info); | |
186c406b | 2612 | delete_exception_resume_breakpoint (info); |
4e1c45ea PA |
2613 | return 0; |
2614 | } | |
2615 | ||
2616 | /* In all-stop, delete the step resume breakpoint of any thread that | |
2617 | had one. In non-stop, delete the step resume breakpoint of the | |
2618 | thread that just stopped. */ | |
2619 | ||
2620 | static void | |
2621 | delete_step_thread_step_resume_breakpoint (void) | |
2622 | { | |
2623 | if (!target_has_execution | |
2624 | || ptid_equal (inferior_ptid, null_ptid)) | |
2625 | /* If the inferior has exited, we have already deleted the step | |
2626 | resume breakpoints out of GDB's lists. */ | |
2627 | return; | |
2628 | ||
2629 | if (non_stop) | |
2630 | { | |
2631 | /* If in non-stop mode, only delete the step-resume or | |
2632 | longjmp-resume breakpoint of the thread that just stopped | |
2633 | stepping. */ | |
2634 | struct thread_info *tp = inferior_thread (); | |
abbb1732 | 2635 | |
4e1c45ea | 2636 | delete_step_resume_breakpoint (tp); |
186c406b | 2637 | delete_exception_resume_breakpoint (tp); |
4e1c45ea PA |
2638 | } |
2639 | else | |
2640 | /* In all-stop mode, delete all step-resume and longjmp-resume | |
2641 | breakpoints of any thread that had them. */ | |
2642 | iterate_over_threads (delete_step_resume_breakpoint_callback, NULL); | |
2643 | } | |
2644 | ||
1777feb0 | 2645 | /* A cleanup wrapper. */ |
4e1c45ea PA |
2646 | |
2647 | static void | |
2648 | delete_step_thread_step_resume_breakpoint_cleanup (void *arg) | |
2649 | { | |
2650 | delete_step_thread_step_resume_breakpoint (); | |
2651 | } | |
2652 | ||
223698f8 DE |
2653 | /* Pretty print the results of target_wait, for debugging purposes. */ |
2654 | ||
2655 | static void | |
2656 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, | |
2657 | const struct target_waitstatus *ws) | |
2658 | { | |
2659 | char *status_string = target_waitstatus_to_string (ws); | |
2660 | struct ui_file *tmp_stream = mem_fileopen (); | |
2661 | char *text; | |
223698f8 DE |
2662 | |
2663 | /* The text is split over several lines because it was getting too long. | |
2664 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
2665 | output as a unit; we want only one timestamp printed if debug_timestamp | |
2666 | is set. */ | |
2667 | ||
2668 | fprintf_unfiltered (tmp_stream, | |
dfd4cc63 LM |
2669 | "infrun: target_wait (%d", ptid_get_pid (waiton_ptid)); |
2670 | if (ptid_get_pid (waiton_ptid) != -1) | |
223698f8 DE |
2671 | fprintf_unfiltered (tmp_stream, |
2672 | " [%s]", target_pid_to_str (waiton_ptid)); | |
2673 | fprintf_unfiltered (tmp_stream, ", status) =\n"); | |
2674 | fprintf_unfiltered (tmp_stream, | |
2675 | "infrun: %d [%s],\n", | |
dfd4cc63 LM |
2676 | ptid_get_pid (result_ptid), |
2677 | target_pid_to_str (result_ptid)); | |
223698f8 DE |
2678 | fprintf_unfiltered (tmp_stream, |
2679 | "infrun: %s\n", | |
2680 | status_string); | |
2681 | ||
759ef836 | 2682 | text = ui_file_xstrdup (tmp_stream, NULL); |
223698f8 DE |
2683 | |
2684 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
2685 | a gcc error: the format attribute requires a string literal. */ | |
2686 | fprintf_unfiltered (gdb_stdlog, "%s", text); | |
2687 | ||
2688 | xfree (status_string); | |
2689 | xfree (text); | |
2690 | ui_file_delete (tmp_stream); | |
2691 | } | |
2692 | ||
24291992 PA |
2693 | /* Prepare and stabilize the inferior for detaching it. E.g., |
2694 | detaching while a thread is displaced stepping is a recipe for | |
2695 | crashing it, as nothing would readjust the PC out of the scratch | |
2696 | pad. */ | |
2697 | ||
2698 | void | |
2699 | prepare_for_detach (void) | |
2700 | { | |
2701 | struct inferior *inf = current_inferior (); | |
2702 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
2703 | struct cleanup *old_chain_1; | |
2704 | struct displaced_step_inferior_state *displaced; | |
2705 | ||
2706 | displaced = get_displaced_stepping_state (inf->pid); | |
2707 | ||
2708 | /* Is any thread of this process displaced stepping? If not, | |
2709 | there's nothing else to do. */ | |
2710 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
2711 | return; | |
2712 | ||
2713 | if (debug_infrun) | |
2714 | fprintf_unfiltered (gdb_stdlog, | |
2715 | "displaced-stepping in-process while detaching"); | |
2716 | ||
2717 | old_chain_1 = make_cleanup_restore_integer (&inf->detaching); | |
2718 | inf->detaching = 1; | |
2719 | ||
2720 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
2721 | { | |
2722 | struct cleanup *old_chain_2; | |
2723 | struct execution_control_state ecss; | |
2724 | struct execution_control_state *ecs; | |
2725 | ||
2726 | ecs = &ecss; | |
2727 | memset (ecs, 0, sizeof (*ecs)); | |
2728 | ||
2729 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
2730 | /* Flush target cache before starting to handle each event. |
2731 | Target was running and cache could be stale. This is just a | |
2732 | heuristic. Running threads may modify target memory, but we | |
2733 | don't get any event. */ | |
2734 | target_dcache_invalidate (); | |
24291992 | 2735 | |
24291992 PA |
2736 | if (deprecated_target_wait_hook) |
2737 | ecs->ptid = deprecated_target_wait_hook (pid_ptid, &ecs->ws, 0); | |
2738 | else | |
2739 | ecs->ptid = target_wait (pid_ptid, &ecs->ws, 0); | |
2740 | ||
2741 | if (debug_infrun) | |
2742 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
2743 | ||
2744 | /* If an error happens while handling the event, propagate GDB's | |
2745 | knowledge of the executing state to the frontend/user running | |
2746 | state. */ | |
3e43a32a MS |
2747 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, |
2748 | &minus_one_ptid); | |
24291992 PA |
2749 | |
2750 | /* Now figure out what to do with the result of the result. */ | |
2751 | handle_inferior_event (ecs); | |
2752 | ||
2753 | /* No error, don't finish the state yet. */ | |
2754 | discard_cleanups (old_chain_2); | |
2755 | ||
2756 | /* Breakpoints and watchpoints are not installed on the target | |
2757 | at this point, and signals are passed directly to the | |
2758 | inferior, so this must mean the process is gone. */ | |
2759 | if (!ecs->wait_some_more) | |
2760 | { | |
2761 | discard_cleanups (old_chain_1); | |
2762 | error (_("Program exited while detaching")); | |
2763 | } | |
2764 | } | |
2765 | ||
2766 | discard_cleanups (old_chain_1); | |
2767 | } | |
2768 | ||
cd0fc7c3 | 2769 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 2770 | |
cd0fc7c3 SS |
2771 | If inferior gets a signal, we may decide to start it up again |
2772 | instead of returning. That is why there is a loop in this function. | |
2773 | When this function actually returns it means the inferior | |
2774 | should be left stopped and GDB should read more commands. */ | |
2775 | ||
2776 | void | |
e4c8541f | 2777 | wait_for_inferior (void) |
cd0fc7c3 SS |
2778 | { |
2779 | struct cleanup *old_cleanups; | |
c906108c | 2780 | |
527159b7 | 2781 | if (debug_infrun) |
ae123ec6 | 2782 | fprintf_unfiltered |
e4c8541f | 2783 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 2784 | |
4e1c45ea PA |
2785 | old_cleanups = |
2786 | make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup, NULL); | |
cd0fc7c3 | 2787 | |
c906108c SS |
2788 | while (1) |
2789 | { | |
ae25568b PA |
2790 | struct execution_control_state ecss; |
2791 | struct execution_control_state *ecs = &ecss; | |
29f49a6a PA |
2792 | struct cleanup *old_chain; |
2793 | ||
ae25568b PA |
2794 | memset (ecs, 0, sizeof (*ecs)); |
2795 | ||
ec9499be | 2796 | overlay_cache_invalid = 1; |
ec9499be | 2797 | |
f15cb84a YQ |
2798 | /* Flush target cache before starting to handle each event. |
2799 | Target was running and cache could be stale. This is just a | |
2800 | heuristic. Running threads may modify target memory, but we | |
2801 | don't get any event. */ | |
2802 | target_dcache_invalidate (); | |
2803 | ||
9a4105ab | 2804 | if (deprecated_target_wait_hook) |
47608cb1 | 2805 | ecs->ptid = deprecated_target_wait_hook (waiton_ptid, &ecs->ws, 0); |
cd0fc7c3 | 2806 | else |
47608cb1 | 2807 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 2808 | |
f00150c9 | 2809 | if (debug_infrun) |
223698f8 | 2810 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 2811 | |
29f49a6a PA |
2812 | /* If an error happens while handling the event, propagate GDB's |
2813 | knowledge of the executing state to the frontend/user running | |
2814 | state. */ | |
2815 | old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2816 | ||
cd0fc7c3 SS |
2817 | /* Now figure out what to do with the result of the result. */ |
2818 | handle_inferior_event (ecs); | |
c906108c | 2819 | |
29f49a6a PA |
2820 | /* No error, don't finish the state yet. */ |
2821 | discard_cleanups (old_chain); | |
2822 | ||
cd0fc7c3 SS |
2823 | if (!ecs->wait_some_more) |
2824 | break; | |
2825 | } | |
4e1c45ea | 2826 | |
cd0fc7c3 SS |
2827 | do_cleanups (old_cleanups); |
2828 | } | |
c906108c | 2829 | |
1777feb0 | 2830 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 2831 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
2832 | descriptor corresponding to the target. It can be called more than |
2833 | once to complete a single execution command. In such cases we need | |
2834 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
2835 | that this function is called for a single execution command, then |
2836 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 2837 | necessary cleanups. */ |
43ff13b4 JM |
2838 | |
2839 | void | |
fba45db2 | 2840 | fetch_inferior_event (void *client_data) |
43ff13b4 | 2841 | { |
0d1e5fa7 | 2842 | struct execution_control_state ecss; |
a474d7c2 | 2843 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 2844 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 2845 | struct cleanup *ts_old_chain; |
4f8d22e3 | 2846 | int was_sync = sync_execution; |
0f641c01 | 2847 | int cmd_done = 0; |
43ff13b4 | 2848 | |
0d1e5fa7 PA |
2849 | memset (ecs, 0, sizeof (*ecs)); |
2850 | ||
c5187ac6 PA |
2851 | /* We're handling a live event, so make sure we're doing live |
2852 | debugging. If we're looking at traceframes while the target is | |
2853 | running, we're going to need to get back to that mode after | |
2854 | handling the event. */ | |
2855 | if (non_stop) | |
2856 | { | |
2857 | make_cleanup_restore_current_traceframe (); | |
e6e4e701 | 2858 | set_current_traceframe (-1); |
c5187ac6 PA |
2859 | } |
2860 | ||
4f8d22e3 PA |
2861 | if (non_stop) |
2862 | /* In non-stop mode, the user/frontend should not notice a thread | |
2863 | switch due to internal events. Make sure we reverse to the | |
2864 | user selected thread and frame after handling the event and | |
2865 | running any breakpoint commands. */ | |
2866 | make_cleanup_restore_current_thread (); | |
2867 | ||
ec9499be | 2868 | overlay_cache_invalid = 1; |
f15cb84a YQ |
2869 | /* Flush target cache before starting to handle each event. Target |
2870 | was running and cache could be stale. This is just a heuristic. | |
2871 | Running threads may modify target memory, but we don't get any | |
2872 | event. */ | |
2873 | target_dcache_invalidate (); | |
3dd5b83d | 2874 | |
32231432 PA |
2875 | make_cleanup_restore_integer (&execution_direction); |
2876 | execution_direction = target_execution_direction (); | |
2877 | ||
9a4105ab | 2878 | if (deprecated_target_wait_hook) |
a474d7c2 | 2879 | ecs->ptid = |
47608cb1 | 2880 | deprecated_target_wait_hook (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 2881 | else |
47608cb1 | 2882 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 2883 | |
f00150c9 | 2884 | if (debug_infrun) |
223698f8 | 2885 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 2886 | |
29f49a6a PA |
2887 | /* If an error happens while handling the event, propagate GDB's |
2888 | knowledge of the executing state to the frontend/user running | |
2889 | state. */ | |
2890 | if (!non_stop) | |
2891 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2892 | else | |
2893 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
2894 | ||
353d1d73 JK |
2895 | /* Get executed before make_cleanup_restore_current_thread above to apply |
2896 | still for the thread which has thrown the exception. */ | |
2897 | make_bpstat_clear_actions_cleanup (); | |
2898 | ||
43ff13b4 | 2899 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 2900 | handle_inferior_event (ecs); |
43ff13b4 | 2901 | |
a474d7c2 | 2902 | if (!ecs->wait_some_more) |
43ff13b4 | 2903 | { |
d6b48e9c PA |
2904 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); |
2905 | ||
4e1c45ea | 2906 | delete_step_thread_step_resume_breakpoint (); |
f107f563 | 2907 | |
d6b48e9c | 2908 | /* We may not find an inferior if this was a process exit. */ |
16c381f0 | 2909 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) |
83c265ab PA |
2910 | normal_stop (); |
2911 | ||
af679fd0 | 2912 | if (target_has_execution |
0e5bf2a8 | 2913 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED |
af679fd0 PA |
2914 | && ecs->ws.kind != TARGET_WAITKIND_EXITED |
2915 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
2916 | && ecs->event_thread->step_multi | |
16c381f0 | 2917 | && ecs->event_thread->control.stop_step) |
c2d11a7d JM |
2918 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); |
2919 | else | |
0f641c01 PA |
2920 | { |
2921 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
2922 | cmd_done = 1; | |
2923 | } | |
43ff13b4 | 2924 | } |
4f8d22e3 | 2925 | |
29f49a6a PA |
2926 | /* No error, don't finish the thread states yet. */ |
2927 | discard_cleanups (ts_old_chain); | |
2928 | ||
4f8d22e3 PA |
2929 | /* Revert thread and frame. */ |
2930 | do_cleanups (old_chain); | |
2931 | ||
2932 | /* If the inferior was in sync execution mode, and now isn't, | |
0f641c01 PA |
2933 | restore the prompt (a synchronous execution command has finished, |
2934 | and we're ready for input). */ | |
b4a14fd0 | 2935 | if (interpreter_async && was_sync && !sync_execution) |
4f8d22e3 | 2936 | display_gdb_prompt (0); |
0f641c01 PA |
2937 | |
2938 | if (cmd_done | |
2939 | && !was_sync | |
2940 | && exec_done_display_p | |
2941 | && (ptid_equal (inferior_ptid, null_ptid) | |
2942 | || !is_running (inferior_ptid))) | |
2943 | printf_unfiltered (_("completed.\n")); | |
43ff13b4 JM |
2944 | } |
2945 | ||
edb3359d DJ |
2946 | /* Record the frame and location we're currently stepping through. */ |
2947 | void | |
2948 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
2949 | { | |
2950 | struct thread_info *tp = inferior_thread (); | |
2951 | ||
16c381f0 JK |
2952 | tp->control.step_frame_id = get_frame_id (frame); |
2953 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
2954 | |
2955 | tp->current_symtab = sal.symtab; | |
2956 | tp->current_line = sal.line; | |
2957 | } | |
2958 | ||
0d1e5fa7 PA |
2959 | /* Clear context switchable stepping state. */ |
2960 | ||
2961 | void | |
4e1c45ea | 2962 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 PA |
2963 | { |
2964 | tss->stepping_over_breakpoint = 0; | |
2965 | tss->step_after_step_resume_breakpoint = 0; | |
cd0fc7c3 SS |
2966 | } |
2967 | ||
e02bc4cc | 2968 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
2969 | target_wait()/deprecated_target_wait_hook(). The data is actually |
2970 | cached by handle_inferior_event(), which gets called immediately | |
2971 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
2972 | |
2973 | void | |
488f131b | 2974 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 2975 | { |
39f77062 | 2976 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
2977 | *status = target_last_waitstatus; |
2978 | } | |
2979 | ||
ac264b3b MS |
2980 | void |
2981 | nullify_last_target_wait_ptid (void) | |
2982 | { | |
2983 | target_last_wait_ptid = minus_one_ptid; | |
2984 | } | |
2985 | ||
dcf4fbde | 2986 | /* Switch thread contexts. */ |
dd80620e MS |
2987 | |
2988 | static void | |
0d1e5fa7 | 2989 | context_switch (ptid_t ptid) |
dd80620e | 2990 | { |
4b51d87b | 2991 | if (debug_infrun && !ptid_equal (ptid, inferior_ptid)) |
fd48f117 DJ |
2992 | { |
2993 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
2994 | target_pid_to_str (inferior_ptid)); | |
2995 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 2996 | target_pid_to_str (ptid)); |
fd48f117 DJ |
2997 | } |
2998 | ||
0d1e5fa7 | 2999 | switch_to_thread (ptid); |
dd80620e MS |
3000 | } |
3001 | ||
4fa8626c DJ |
3002 | static void |
3003 | adjust_pc_after_break (struct execution_control_state *ecs) | |
3004 | { | |
24a73cce UW |
3005 | struct regcache *regcache; |
3006 | struct gdbarch *gdbarch; | |
6c95b8df | 3007 | struct address_space *aspace; |
118e6252 | 3008 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 3009 | |
4fa8626c DJ |
3010 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
3011 | we aren't, just return. | |
9709f61c DJ |
3012 | |
3013 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
3014 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
3015 | implemented by software breakpoints should be handled through the normal | |
3016 | breakpoint layer. | |
8fb3e588 | 3017 | |
4fa8626c DJ |
3018 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
3019 | different signals (SIGILL or SIGEMT for instance), but it is less | |
3020 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
3021 | gdbarch_decr_pc_after_break. I don't know any specific target that |
3022 | generates these signals at breakpoints (the code has been in GDB since at | |
3023 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 3024 | |
e6cf7916 UW |
3025 | In earlier versions of GDB, a target with |
3026 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
3027 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
3028 | target with both of these set in GDB history, and it seems unlikely to be | |
3029 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c DJ |
3030 | |
3031 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
3032 | return; | |
3033 | ||
a493e3e2 | 3034 | if (ecs->ws.value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
3035 | return; |
3036 | ||
4058b839 PA |
3037 | /* In reverse execution, when a breakpoint is hit, the instruction |
3038 | under it has already been de-executed. The reported PC always | |
3039 | points at the breakpoint address, so adjusting it further would | |
3040 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
3041 | architecture: | |
3042 | ||
3043 | B1 0x08000000 : INSN1 | |
3044 | B2 0x08000001 : INSN2 | |
3045 | 0x08000002 : INSN3 | |
3046 | PC -> 0x08000003 : INSN4 | |
3047 | ||
3048 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
3049 | from that point should hit B2 as below. Reading the PC when the | |
3050 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
3051 | been de-executed already. | |
3052 | ||
3053 | B1 0x08000000 : INSN1 | |
3054 | B2 PC -> 0x08000001 : INSN2 | |
3055 | 0x08000002 : INSN3 | |
3056 | 0x08000003 : INSN4 | |
3057 | ||
3058 | We can't apply the same logic as for forward execution, because | |
3059 | we would wrongly adjust the PC to 0x08000000, since there's a | |
3060 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
3061 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
3062 | behaviour. */ | |
3063 | if (execution_direction == EXEC_REVERSE) | |
3064 | return; | |
3065 | ||
24a73cce UW |
3066 | /* If this target does not decrement the PC after breakpoints, then |
3067 | we have nothing to do. */ | |
3068 | regcache = get_thread_regcache (ecs->ptid); | |
3069 | gdbarch = get_regcache_arch (regcache); | |
118e6252 MM |
3070 | |
3071 | decr_pc = target_decr_pc_after_break (gdbarch); | |
3072 | if (decr_pc == 0) | |
24a73cce UW |
3073 | return; |
3074 | ||
6c95b8df PA |
3075 | aspace = get_regcache_aspace (regcache); |
3076 | ||
8aad930b AC |
3077 | /* Find the location where (if we've hit a breakpoint) the |
3078 | breakpoint would be. */ | |
118e6252 | 3079 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 3080 | |
1c5cfe86 PA |
3081 | /* Check whether there actually is a software breakpoint inserted at |
3082 | that location. | |
3083 | ||
3084 | If in non-stop mode, a race condition is possible where we've | |
3085 | removed a breakpoint, but stop events for that breakpoint were | |
3086 | already queued and arrive later. To suppress those spurious | |
3087 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
3088 | and retire them after a number of stop events are reported. */ | |
6c95b8df PA |
3089 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
3090 | || (non_stop && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 3091 | { |
77f9e713 | 3092 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); |
abbb1732 | 3093 | |
8213266a | 3094 | if (record_full_is_used ()) |
77f9e713 | 3095 | record_full_gdb_operation_disable_set (); |
96429cc8 | 3096 | |
1c0fdd0e UW |
3097 | /* When using hardware single-step, a SIGTRAP is reported for both |
3098 | a completed single-step and a software breakpoint. Need to | |
3099 | differentiate between the two, as the latter needs adjusting | |
3100 | but the former does not. | |
3101 | ||
3102 | The SIGTRAP can be due to a completed hardware single-step only if | |
3103 | - we didn't insert software single-step breakpoints | |
3104 | - the thread to be examined is still the current thread | |
3105 | - this thread is currently being stepped | |
3106 | ||
3107 | If any of these events did not occur, we must have stopped due | |
3108 | to hitting a software breakpoint, and have to back up to the | |
3109 | breakpoint address. | |
3110 | ||
3111 | As a special case, we could have hardware single-stepped a | |
3112 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
3113 | we also need to back up to the breakpoint address. */ | |
3114 | ||
3115 | if (singlestep_breakpoints_inserted_p | |
3116 | || !ptid_equal (ecs->ptid, inferior_ptid) | |
4e1c45ea PA |
3117 | || !currently_stepping (ecs->event_thread) |
3118 | || ecs->event_thread->prev_pc == breakpoint_pc) | |
515630c5 | 3119 | regcache_write_pc (regcache, breakpoint_pc); |
96429cc8 | 3120 | |
77f9e713 | 3121 | do_cleanups (old_cleanups); |
8aad930b | 3122 | } |
4fa8626c DJ |
3123 | } |
3124 | ||
7a76f5b8 | 3125 | static void |
0d1e5fa7 PA |
3126 | init_infwait_state (void) |
3127 | { | |
3128 | waiton_ptid = pid_to_ptid (-1); | |
3129 | infwait_state = infwait_normal_state; | |
3130 | } | |
3131 | ||
edb3359d DJ |
3132 | static int |
3133 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
3134 | { | |
3135 | for (frame = get_prev_frame (frame); | |
3136 | frame != NULL; | |
3137 | frame = get_prev_frame (frame)) | |
3138 | { | |
3139 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
3140 | return 1; | |
3141 | if (get_frame_type (frame) != INLINE_FRAME) | |
3142 | break; | |
3143 | } | |
3144 | ||
3145 | return 0; | |
3146 | } | |
3147 | ||
a96d9b2e SDJ |
3148 | /* Auxiliary function that handles syscall entry/return events. |
3149 | It returns 1 if the inferior should keep going (and GDB | |
3150 | should ignore the event), or 0 if the event deserves to be | |
3151 | processed. */ | |
ca2163eb | 3152 | |
a96d9b2e | 3153 | static int |
ca2163eb | 3154 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 3155 | { |
ca2163eb | 3156 | struct regcache *regcache; |
ca2163eb PA |
3157 | int syscall_number; |
3158 | ||
3159 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3160 | context_switch (ecs->ptid); | |
3161 | ||
3162 | regcache = get_thread_regcache (ecs->ptid); | |
f90263c1 | 3163 | syscall_number = ecs->ws.value.syscall_number; |
ca2163eb PA |
3164 | stop_pc = regcache_read_pc (regcache); |
3165 | ||
a96d9b2e SDJ |
3166 | if (catch_syscall_enabled () > 0 |
3167 | && catching_syscall_number (syscall_number) > 0) | |
3168 | { | |
3169 | if (debug_infrun) | |
3170 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
3171 | syscall_number); | |
a96d9b2e | 3172 | |
16c381f0 | 3173 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 3174 | = bpstat_stop_status (get_regcache_aspace (regcache), |
09ac7c10 | 3175 | stop_pc, ecs->ptid, &ecs->ws); |
ab04a2af | 3176 | |
ce12b012 | 3177 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
3178 | { |
3179 | /* Catchpoint hit. */ | |
ca2163eb PA |
3180 | return 0; |
3181 | } | |
a96d9b2e | 3182 | } |
ca2163eb PA |
3183 | |
3184 | /* If no catchpoint triggered for this, then keep going. */ | |
ca2163eb PA |
3185 | keep_going (ecs); |
3186 | return 1; | |
a96d9b2e SDJ |
3187 | } |
3188 | ||
7e324e48 GB |
3189 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
3190 | ||
3191 | static void | |
3192 | fill_in_stop_func (struct gdbarch *gdbarch, | |
3193 | struct execution_control_state *ecs) | |
3194 | { | |
3195 | if (!ecs->stop_func_filled_in) | |
3196 | { | |
3197 | /* Don't care about return value; stop_func_start and stop_func_name | |
3198 | will both be 0 if it doesn't work. */ | |
3199 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
3200 | &ecs->stop_func_start, &ecs->stop_func_end); | |
3201 | ecs->stop_func_start | |
3202 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
3203 | ||
591a12a1 UW |
3204 | if (gdbarch_skip_entrypoint_p (gdbarch)) |
3205 | ecs->stop_func_start = gdbarch_skip_entrypoint (gdbarch, | |
3206 | ecs->stop_func_start); | |
3207 | ||
7e324e48 GB |
3208 | ecs->stop_func_filled_in = 1; |
3209 | } | |
3210 | } | |
3211 | ||
4f5d7f63 PA |
3212 | |
3213 | /* Return the STOP_SOON field of the inferior pointed at by PTID. */ | |
3214 | ||
3215 | static enum stop_kind | |
3216 | get_inferior_stop_soon (ptid_t ptid) | |
3217 | { | |
3218 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ptid)); | |
3219 | ||
3220 | gdb_assert (inf != NULL); | |
3221 | return inf->control.stop_soon; | |
3222 | } | |
3223 | ||
05ba8510 PA |
3224 | /* Given an execution control state that has been freshly filled in by |
3225 | an event from the inferior, figure out what it means and take | |
3226 | appropriate action. | |
3227 | ||
3228 | The alternatives are: | |
3229 | ||
3230 | 1) stop_stepping and return; to really stop and return to the | |
3231 | debugger. | |
3232 | ||
3233 | 2) keep_going and return; to wait for the next event (set | |
3234 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
3235 | once). */ | |
c906108c | 3236 | |
ec9499be | 3237 | static void |
96baa820 | 3238 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 3239 | { |
d6b48e9c PA |
3240 | enum stop_kind stop_soon; |
3241 | ||
28736962 PA |
3242 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
3243 | { | |
3244 | /* We had an event in the inferior, but we are not interested in | |
3245 | handling it at this level. The lower layers have already | |
3246 | done what needs to be done, if anything. | |
3247 | ||
3248 | One of the possible circumstances for this is when the | |
3249 | inferior produces output for the console. The inferior has | |
3250 | not stopped, and we are ignoring the event. Another possible | |
3251 | circumstance is any event which the lower level knows will be | |
3252 | reported multiple times without an intervening resume. */ | |
3253 | if (debug_infrun) | |
3254 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
3255 | prepare_to_wait (ecs); | |
3256 | return; | |
3257 | } | |
3258 | ||
0e5bf2a8 PA |
3259 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
3260 | && target_can_async_p () && !sync_execution) | |
3261 | { | |
3262 | /* There were no unwaited-for children left in the target, but, | |
3263 | we're not synchronously waiting for events either. Just | |
3264 | ignore. Otherwise, if we were running a synchronous | |
3265 | execution command, we need to cancel it and give the user | |
3266 | back the terminal. */ | |
3267 | if (debug_infrun) | |
3268 | fprintf_unfiltered (gdb_stdlog, | |
3269 | "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n"); | |
3270 | prepare_to_wait (ecs); | |
3271 | return; | |
3272 | } | |
3273 | ||
1777feb0 | 3274 | /* Cache the last pid/waitstatus. */ |
39f77062 | 3275 | target_last_wait_ptid = ecs->ptid; |
0d1e5fa7 | 3276 | target_last_waitstatus = ecs->ws; |
e02bc4cc | 3277 | |
ca005067 | 3278 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 3279 | stop_stack_dummy = STOP_NONE; |
ca005067 | 3280 | |
0e5bf2a8 PA |
3281 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
3282 | { | |
3283 | /* No unwaited-for children left. IOW, all resumed children | |
3284 | have exited. */ | |
3285 | if (debug_infrun) | |
3286 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
3287 | ||
3288 | stop_print_frame = 0; | |
3289 | stop_stepping (ecs); | |
3290 | return; | |
3291 | } | |
3292 | ||
8c90c137 | 3293 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 3294 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 PA |
3295 | { |
3296 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
3297 | /* If it's a new thread, add it to the thread database. */ | |
3298 | if (ecs->event_thread == NULL) | |
3299 | ecs->event_thread = add_thread (ecs->ptid); | |
c1e36e3e PA |
3300 | |
3301 | /* Disable range stepping. If the next step request could use a | |
3302 | range, this will be end up re-enabled then. */ | |
3303 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 3304 | } |
88ed393a JK |
3305 | |
3306 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
3307 | adjust_pc_after_break (ecs); | |
3308 | ||
3309 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
3310 | reinit_frame_cache (); | |
3311 | ||
28736962 PA |
3312 | breakpoint_retire_moribund (); |
3313 | ||
2b009048 DJ |
3314 | /* First, distinguish signals caused by the debugger from signals |
3315 | that have to do with the program's own actions. Note that | |
3316 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
3317 | on the operating system version. Here we detect when a SIGILL or | |
3318 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
3319 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
3320 | when we're trying to execute a breakpoint instruction on a | |
3321 | non-executable stack. This happens for call dummy breakpoints | |
3322 | for architectures like SPARC that place call dummies on the | |
3323 | stack. */ | |
2b009048 | 3324 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
3325 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
3326 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
3327 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 3328 | { |
de0a0249 UW |
3329 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
3330 | ||
3331 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
3332 | regcache_read_pc (regcache))) | |
3333 | { | |
3334 | if (debug_infrun) | |
3335 | fprintf_unfiltered (gdb_stdlog, | |
3336 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 3337 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 3338 | } |
2b009048 DJ |
3339 | } |
3340 | ||
28736962 PA |
3341 | /* Mark the non-executing threads accordingly. In all-stop, all |
3342 | threads of all processes are stopped when we get any event | |
3343 | reported. In non-stop mode, only the event thread stops. If | |
3344 | we're handling a process exit in non-stop mode, there's nothing | |
3345 | to do, as threads of the dead process are gone, and threads of | |
3346 | any other process were left running. */ | |
3347 | if (!non_stop) | |
3348 | set_executing (minus_one_ptid, 0); | |
3349 | else if (ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
3350 | && ecs->ws.kind != TARGET_WAITKIND_EXITED) | |
7aee8dc2 | 3351 | set_executing (ecs->ptid, 0); |
8c90c137 | 3352 | |
0d1e5fa7 | 3353 | switch (infwait_state) |
488f131b | 3354 | { |
488f131b | 3355 | case infwait_normal_state: |
527159b7 | 3356 | if (debug_infrun) |
8a9de0e4 | 3357 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
d983da9c DJ |
3358 | break; |
3359 | ||
3360 | case infwait_step_watch_state: | |
3361 | if (debug_infrun) | |
3362 | fprintf_unfiltered (gdb_stdlog, | |
3363 | "infrun: infwait_step_watch_state\n"); | |
3364 | ||
4f5d7f63 | 3365 | ecs->stepped_after_stopped_by_watchpoint = 1; |
488f131b | 3366 | break; |
b83266a0 | 3367 | |
488f131b | 3368 | case infwait_nonstep_watch_state: |
527159b7 | 3369 | if (debug_infrun) |
8a9de0e4 AC |
3370 | fprintf_unfiltered (gdb_stdlog, |
3371 | "infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 3372 | insert_breakpoints (); |
c906108c | 3373 | |
488f131b JB |
3374 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
3375 | handle things like signals arriving and other things happening | |
3376 | in combination correctly? */ | |
4f5d7f63 | 3377 | ecs->stepped_after_stopped_by_watchpoint = 1; |
488f131b | 3378 | break; |
65e82032 AC |
3379 | |
3380 | default: | |
e2e0b3e5 | 3381 | internal_error (__FILE__, __LINE__, _("bad switch")); |
488f131b | 3382 | } |
ec9499be | 3383 | |
0d1e5fa7 | 3384 | infwait_state = infwait_normal_state; |
ec9499be | 3385 | waiton_ptid = pid_to_ptid (-1); |
c906108c | 3386 | |
488f131b JB |
3387 | switch (ecs->ws.kind) |
3388 | { | |
3389 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 3390 | if (debug_infrun) |
8a9de0e4 | 3391 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
5c09a2c5 PA |
3392 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3393 | context_switch (ecs->ptid); | |
b0f4b84b DJ |
3394 | /* Ignore gracefully during startup of the inferior, as it might |
3395 | be the shell which has just loaded some objects, otherwise | |
3396 | add the symbols for the newly loaded objects. Also ignore at | |
3397 | the beginning of an attach or remote session; we will query | |
3398 | the full list of libraries once the connection is | |
3399 | established. */ | |
4f5d7f63 PA |
3400 | |
3401 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
c0236d92 | 3402 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 3403 | { |
edcc5120 TT |
3404 | struct regcache *regcache; |
3405 | ||
edcc5120 TT |
3406 | regcache = get_thread_regcache (ecs->ptid); |
3407 | ||
3408 | handle_solib_event (); | |
3409 | ||
3410 | ecs->event_thread->control.stop_bpstat | |
3411 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
3412 | stop_pc, ecs->ptid, &ecs->ws); | |
ab04a2af | 3413 | |
ce12b012 | 3414 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
3415 | { |
3416 | /* A catchpoint triggered. */ | |
94c57d6a PA |
3417 | process_event_stop_test (ecs); |
3418 | return; | |
edcc5120 | 3419 | } |
488f131b | 3420 | |
b0f4b84b DJ |
3421 | /* If requested, stop when the dynamic linker notifies |
3422 | gdb of events. This allows the user to get control | |
3423 | and place breakpoints in initializer routines for | |
3424 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 3425 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
3426 | if (stop_on_solib_events) |
3427 | { | |
55409f9d DJ |
3428 | /* Make sure we print "Stopped due to solib-event" in |
3429 | normal_stop. */ | |
3430 | stop_print_frame = 1; | |
3431 | ||
b0f4b84b DJ |
3432 | stop_stepping (ecs); |
3433 | return; | |
3434 | } | |
488f131b | 3435 | } |
b0f4b84b DJ |
3436 | |
3437 | /* If we are skipping through a shell, or through shared library | |
3438 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 3439 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
3440 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
3441 | { | |
74960c60 VP |
3442 | /* Loading of shared libraries might have changed breakpoint |
3443 | addresses. Make sure new breakpoints are inserted. */ | |
0b02b92d UW |
3444 | if (stop_soon == NO_STOP_QUIETLY |
3445 | && !breakpoints_always_inserted_mode ()) | |
74960c60 | 3446 | insert_breakpoints (); |
a493e3e2 | 3447 | resume (0, GDB_SIGNAL_0); |
b0f4b84b DJ |
3448 | prepare_to_wait (ecs); |
3449 | return; | |
3450 | } | |
3451 | ||
5c09a2c5 PA |
3452 | /* But stop if we're attaching or setting up a remote |
3453 | connection. */ | |
3454 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
3455 | || stop_soon == STOP_QUIETLY_REMOTE) | |
3456 | { | |
3457 | if (debug_infrun) | |
3458 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
3459 | stop_stepping (ecs); | |
3460 | return; | |
3461 | } | |
3462 | ||
3463 | internal_error (__FILE__, __LINE__, | |
3464 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 3465 | |
488f131b | 3466 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 3467 | if (debug_infrun) |
8a9de0e4 | 3468 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
64776a0b | 3469 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
8b3ee56d | 3470 | context_switch (ecs->ptid); |
a493e3e2 | 3471 | resume (0, GDB_SIGNAL_0); |
488f131b JB |
3472 | prepare_to_wait (ecs); |
3473 | return; | |
c5aa993b | 3474 | |
488f131b | 3475 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 3476 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 3477 | if (debug_infrun) |
940c3c06 PA |
3478 | { |
3479 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
3480 | fprintf_unfiltered (gdb_stdlog, | |
3481 | "infrun: TARGET_WAITKIND_EXITED\n"); | |
3482 | else | |
3483 | fprintf_unfiltered (gdb_stdlog, | |
3484 | "infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
3485 | } | |
3486 | ||
fb66883a | 3487 | inferior_ptid = ecs->ptid; |
6c95b8df PA |
3488 | set_current_inferior (find_inferior_pid (ptid_get_pid (ecs->ptid))); |
3489 | set_current_program_space (current_inferior ()->pspace); | |
3490 | handle_vfork_child_exec_or_exit (0); | |
1777feb0 | 3491 | target_terminal_ours (); /* Must do this before mourn anyway. */ |
488f131b | 3492 | |
0c557179 SDJ |
3493 | /* Clearing any previous state of convenience variables. */ |
3494 | clear_exit_convenience_vars (); | |
3495 | ||
940c3c06 PA |
3496 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
3497 | { | |
3498 | /* Record the exit code in the convenience variable $_exitcode, so | |
3499 | that the user can inspect this again later. */ | |
3500 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
3501 | (LONGEST) ecs->ws.value.integer); | |
3502 | ||
3503 | /* Also record this in the inferior itself. */ | |
3504 | current_inferior ()->has_exit_code = 1; | |
3505 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 3506 | |
940c3c06 PA |
3507 | print_exited_reason (ecs->ws.value.integer); |
3508 | } | |
3509 | else | |
0c557179 SDJ |
3510 | { |
3511 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
3512 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3513 | ||
3514 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
3515 | { | |
3516 | /* Set the value of the internal variable $_exitsignal, | |
3517 | which holds the signal uncaught by the inferior. */ | |
3518 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
3519 | gdbarch_gdb_signal_to_target (gdbarch, | |
3520 | ecs->ws.value.sig)); | |
3521 | } | |
3522 | else | |
3523 | { | |
3524 | /* We don't have access to the target's method used for | |
3525 | converting between signal numbers (GDB's internal | |
3526 | representation <-> target's representation). | |
3527 | Therefore, we cannot do a good job at displaying this | |
3528 | information to the user. It's better to just warn | |
3529 | her about it (if infrun debugging is enabled), and | |
3530 | give up. */ | |
3531 | if (debug_infrun) | |
3532 | fprintf_filtered (gdb_stdlog, _("\ | |
3533 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
3534 | } | |
3535 | ||
3536 | print_signal_exited_reason (ecs->ws.value.sig); | |
3537 | } | |
8cf64490 | 3538 | |
488f131b JB |
3539 | gdb_flush (gdb_stdout); |
3540 | target_mourn_inferior (); | |
1c0fdd0e | 3541 | singlestep_breakpoints_inserted_p = 0; |
d03285ec | 3542 | cancel_single_step_breakpoints (); |
488f131b JB |
3543 | stop_print_frame = 0; |
3544 | stop_stepping (ecs); | |
3545 | return; | |
c5aa993b | 3546 | |
488f131b | 3547 | /* The following are the only cases in which we keep going; |
1777feb0 | 3548 | the above cases end in a continue or goto. */ |
488f131b | 3549 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 3550 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 3551 | if (debug_infrun) |
fed708ed PA |
3552 | { |
3553 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
3554 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); | |
3555 | else | |
3556 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n"); | |
3557 | } | |
c906108c | 3558 | |
e2d96639 YQ |
3559 | /* Check whether the inferior is displaced stepping. */ |
3560 | { | |
3561 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
3562 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3563 | struct displaced_step_inferior_state *displaced | |
3564 | = get_displaced_stepping_state (ptid_get_pid (ecs->ptid)); | |
3565 | ||
3566 | /* If checking displaced stepping is supported, and thread | |
3567 | ecs->ptid is displaced stepping. */ | |
3568 | if (displaced && ptid_equal (displaced->step_ptid, ecs->ptid)) | |
3569 | { | |
3570 | struct inferior *parent_inf | |
3571 | = find_inferior_pid (ptid_get_pid (ecs->ptid)); | |
3572 | struct regcache *child_regcache; | |
3573 | CORE_ADDR parent_pc; | |
3574 | ||
3575 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
3576 | indicating that the displaced stepping of syscall instruction | |
3577 | has been done. Perform cleanup for parent process here. Note | |
3578 | that this operation also cleans up the child process for vfork, | |
3579 | because their pages are shared. */ | |
a493e3e2 | 3580 | displaced_step_fixup (ecs->ptid, GDB_SIGNAL_TRAP); |
e2d96639 YQ |
3581 | |
3582 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
3583 | { | |
3584 | /* Restore scratch pad for child process. */ | |
3585 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
3586 | } | |
3587 | ||
3588 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
3589 | the child's PC is also within the scratchpad. Set the child's PC | |
3590 | to the parent's PC value, which has already been fixed up. | |
3591 | FIXME: we use the parent's aspace here, although we're touching | |
3592 | the child, because the child hasn't been added to the inferior | |
3593 | list yet at this point. */ | |
3594 | ||
3595 | child_regcache | |
3596 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
3597 | gdbarch, | |
3598 | parent_inf->aspace); | |
3599 | /* Read PC value of parent process. */ | |
3600 | parent_pc = regcache_read_pc (regcache); | |
3601 | ||
3602 | if (debug_displaced) | |
3603 | fprintf_unfiltered (gdb_stdlog, | |
3604 | "displaced: write child pc from %s to %s\n", | |
3605 | paddress (gdbarch, | |
3606 | regcache_read_pc (child_regcache)), | |
3607 | paddress (gdbarch, parent_pc)); | |
3608 | ||
3609 | regcache_write_pc (child_regcache, parent_pc); | |
3610 | } | |
3611 | } | |
3612 | ||
5a2901d9 | 3613 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 3614 | context_switch (ecs->ptid); |
5a2901d9 | 3615 | |
b242c3c2 PA |
3616 | /* Immediately detach breakpoints from the child before there's |
3617 | any chance of letting the user delete breakpoints from the | |
3618 | breakpoint lists. If we don't do this early, it's easy to | |
3619 | leave left over traps in the child, vis: "break foo; catch | |
3620 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
3621 | the fork on the last `continue', and by that time the | |
3622 | breakpoint at "foo" is long gone from the breakpoint table. | |
3623 | If we vforked, then we don't need to unpatch here, since both | |
3624 | parent and child are sharing the same memory pages; we'll | |
3625 | need to unpatch at follow/detach time instead to be certain | |
3626 | that new breakpoints added between catchpoint hit time and | |
3627 | vfork follow are detached. */ | |
3628 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
3629 | { | |
b242c3c2 PA |
3630 | /* This won't actually modify the breakpoint list, but will |
3631 | physically remove the breakpoints from the child. */ | |
d80ee84f | 3632 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
3633 | } |
3634 | ||
d03285ec UW |
3635 | if (singlestep_breakpoints_inserted_p) |
3636 | { | |
1777feb0 | 3637 | /* Pull the single step breakpoints out of the target. */ |
d03285ec UW |
3638 | remove_single_step_breakpoints (); |
3639 | singlestep_breakpoints_inserted_p = 0; | |
3640 | } | |
3641 | ||
e58b0e63 PA |
3642 | /* In case the event is caught by a catchpoint, remember that |
3643 | the event is to be followed at the next resume of the thread, | |
3644 | and not immediately. */ | |
3645 | ecs->event_thread->pending_follow = ecs->ws; | |
3646 | ||
fb14de7b | 3647 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 3648 | |
16c381f0 | 3649 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 3650 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 3651 | stop_pc, ecs->ptid, &ecs->ws); |
675bf4cb | 3652 | |
ce12b012 PA |
3653 | /* If no catchpoint triggered for this, then keep going. Note |
3654 | that we're interested in knowing the bpstat actually causes a | |
3655 | stop, not just if it may explain the signal. Software | |
3656 | watchpoints, for example, always appear in the bpstat. */ | |
3657 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 3658 | { |
6c95b8df PA |
3659 | ptid_t parent; |
3660 | ptid_t child; | |
e58b0e63 | 3661 | int should_resume; |
3e43a32a MS |
3662 | int follow_child |
3663 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 3664 | |
a493e3e2 | 3665 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 PA |
3666 | |
3667 | should_resume = follow_fork (); | |
3668 | ||
6c95b8df PA |
3669 | parent = ecs->ptid; |
3670 | child = ecs->ws.value.related_pid; | |
3671 | ||
3672 | /* In non-stop mode, also resume the other branch. */ | |
3673 | if (non_stop && !detach_fork) | |
3674 | { | |
3675 | if (follow_child) | |
3676 | switch_to_thread (parent); | |
3677 | else | |
3678 | switch_to_thread (child); | |
3679 | ||
3680 | ecs->event_thread = inferior_thread (); | |
3681 | ecs->ptid = inferior_ptid; | |
3682 | keep_going (ecs); | |
3683 | } | |
3684 | ||
3685 | if (follow_child) | |
3686 | switch_to_thread (child); | |
3687 | else | |
3688 | switch_to_thread (parent); | |
3689 | ||
e58b0e63 PA |
3690 | ecs->event_thread = inferior_thread (); |
3691 | ecs->ptid = inferior_ptid; | |
3692 | ||
3693 | if (should_resume) | |
3694 | keep_going (ecs); | |
3695 | else | |
3696 | stop_stepping (ecs); | |
04e68871 DJ |
3697 | return; |
3698 | } | |
94c57d6a PA |
3699 | process_event_stop_test (ecs); |
3700 | return; | |
488f131b | 3701 | |
6c95b8df PA |
3702 | case TARGET_WAITKIND_VFORK_DONE: |
3703 | /* Done with the shared memory region. Re-insert breakpoints in | |
3704 | the parent, and keep going. */ | |
3705 | ||
3706 | if (debug_infrun) | |
3e43a32a MS |
3707 | fprintf_unfiltered (gdb_stdlog, |
3708 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
6c95b8df PA |
3709 | |
3710 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3711 | context_switch (ecs->ptid); | |
3712 | ||
3713 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 3714 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
6c95b8df PA |
3715 | /* This also takes care of reinserting breakpoints in the |
3716 | previously locked inferior. */ | |
3717 | keep_going (ecs); | |
3718 | return; | |
3719 | ||
488f131b | 3720 | case TARGET_WAITKIND_EXECD: |
527159b7 | 3721 | if (debug_infrun) |
fc5261f2 | 3722 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 3723 | |
5a2901d9 | 3724 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 3725 | context_switch (ecs->ptid); |
5a2901d9 | 3726 | |
d03285ec UW |
3727 | singlestep_breakpoints_inserted_p = 0; |
3728 | cancel_single_step_breakpoints (); | |
3729 | ||
fb14de7b | 3730 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
795e548f | 3731 | |
6c95b8df PA |
3732 | /* Do whatever is necessary to the parent branch of the vfork. */ |
3733 | handle_vfork_child_exec_or_exit (1); | |
3734 | ||
795e548f PA |
3735 | /* This causes the eventpoints and symbol table to be reset. |
3736 | Must do this now, before trying to determine whether to | |
3737 | stop. */ | |
71b43ef8 | 3738 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 3739 | |
16c381f0 | 3740 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 3741 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 3742 | stop_pc, ecs->ptid, &ecs->ws); |
795e548f | 3743 | |
71b43ef8 PA |
3744 | /* Note that this may be referenced from inside |
3745 | bpstat_stop_status above, through inferior_has_execd. */ | |
3746 | xfree (ecs->ws.value.execd_pathname); | |
3747 | ecs->ws.value.execd_pathname = NULL; | |
3748 | ||
04e68871 | 3749 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 3750 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 3751 | { |
a493e3e2 | 3752 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
3753 | keep_going (ecs); |
3754 | return; | |
3755 | } | |
94c57d6a PA |
3756 | process_event_stop_test (ecs); |
3757 | return; | |
488f131b | 3758 | |
b4dc5ffa MK |
3759 | /* Be careful not to try to gather much state about a thread |
3760 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 3761 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 3762 | if (debug_infrun) |
3e43a32a MS |
3763 | fprintf_unfiltered (gdb_stdlog, |
3764 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
1777feb0 | 3765 | /* Getting the current syscall number. */ |
94c57d6a PA |
3766 | if (handle_syscall_event (ecs) == 0) |
3767 | process_event_stop_test (ecs); | |
3768 | return; | |
c906108c | 3769 | |
488f131b JB |
3770 | /* Before examining the threads further, step this thread to |
3771 | get it entirely out of the syscall. (We get notice of the | |
3772 | event when the thread is just on the verge of exiting a | |
3773 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 3774 | into user code.) */ |
488f131b | 3775 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 3776 | if (debug_infrun) |
3e43a32a MS |
3777 | fprintf_unfiltered (gdb_stdlog, |
3778 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
94c57d6a PA |
3779 | if (handle_syscall_event (ecs) == 0) |
3780 | process_event_stop_test (ecs); | |
3781 | return; | |
c906108c | 3782 | |
488f131b | 3783 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 3784 | if (debug_infrun) |
8a9de0e4 | 3785 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
16c381f0 | 3786 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
4f5d7f63 PA |
3787 | handle_signal_stop (ecs); |
3788 | return; | |
c906108c | 3789 | |
b2175913 | 3790 | case TARGET_WAITKIND_NO_HISTORY: |
4b4e080e PA |
3791 | if (debug_infrun) |
3792 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
b2175913 | 3793 | /* Reverse execution: target ran out of history info. */ |
eab402df PA |
3794 | |
3795 | /* Pull the single step breakpoints out of the target. */ | |
3796 | if (singlestep_breakpoints_inserted_p) | |
3797 | { | |
3798 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3799 | context_switch (ecs->ptid); | |
3800 | remove_single_step_breakpoints (); | |
3801 | singlestep_breakpoints_inserted_p = 0; | |
3802 | } | |
fb14de7b | 3803 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
33d62d64 | 3804 | print_no_history_reason (); |
b2175913 MS |
3805 | stop_stepping (ecs); |
3806 | return; | |
488f131b | 3807 | } |
4f5d7f63 PA |
3808 | } |
3809 | ||
3810 | /* Come here when the program has stopped with a signal. */ | |
3811 | ||
3812 | static void | |
3813 | handle_signal_stop (struct execution_control_state *ecs) | |
3814 | { | |
3815 | struct frame_info *frame; | |
3816 | struct gdbarch *gdbarch; | |
3817 | int stopped_by_watchpoint; | |
3818 | enum stop_kind stop_soon; | |
3819 | int random_signal; | |
c906108c | 3820 | |
f0407826 DE |
3821 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
3822 | ||
3823 | /* Do we need to clean up the state of a thread that has | |
3824 | completed a displaced single-step? (Doing so usually affects | |
3825 | the PC, so do it here, before we set stop_pc.) */ | |
3826 | displaced_step_fixup (ecs->ptid, | |
3827 | ecs->event_thread->suspend.stop_signal); | |
3828 | ||
3829 | /* If we either finished a single-step or hit a breakpoint, but | |
3830 | the user wanted this thread to be stopped, pretend we got a | |
3831 | SIG0 (generic unsignaled stop). */ | |
3832 | if (ecs->event_thread->stop_requested | |
3833 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
3834 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 3835 | |
515630c5 | 3836 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 3837 | |
527159b7 | 3838 | if (debug_infrun) |
237fc4c9 | 3839 | { |
5af949e3 UW |
3840 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
3841 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7f82dfc7 JK |
3842 | struct cleanup *old_chain = save_inferior_ptid (); |
3843 | ||
3844 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
3845 | |
3846 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
3847 | paddress (gdbarch, stop_pc)); | |
d92524f1 | 3848 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
3849 | { |
3850 | CORE_ADDR addr; | |
abbb1732 | 3851 | |
237fc4c9 PA |
3852 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
3853 | ||
3854 | if (target_stopped_data_address (¤t_target, &addr)) | |
3855 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
3856 | "infrun: stopped data address = %s\n", |
3857 | paddress (gdbarch, addr)); | |
237fc4c9 PA |
3858 | else |
3859 | fprintf_unfiltered (gdb_stdlog, | |
3860 | "infrun: (no data address available)\n"); | |
3861 | } | |
7f82dfc7 JK |
3862 | |
3863 | do_cleanups (old_chain); | |
237fc4c9 | 3864 | } |
527159b7 | 3865 | |
36fa8042 PA |
3866 | /* This is originated from start_remote(), start_inferior() and |
3867 | shared libraries hook functions. */ | |
3868 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
3869 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) | |
3870 | { | |
3871 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3872 | context_switch (ecs->ptid); | |
3873 | if (debug_infrun) | |
3874 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
3875 | stop_print_frame = 1; | |
3876 | stop_stepping (ecs); | |
3877 | return; | |
3878 | } | |
3879 | ||
3880 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
3881 | && stop_after_trap) | |
3882 | { | |
3883 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3884 | context_switch (ecs->ptid); | |
3885 | if (debug_infrun) | |
3886 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
3887 | stop_print_frame = 0; | |
3888 | stop_stepping (ecs); | |
3889 | return; | |
3890 | } | |
3891 | ||
3892 | /* This originates from attach_command(). We need to overwrite | |
3893 | the stop_signal here, because some kernels don't ignore a | |
3894 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
3895 | See more comments in inferior.h. On the other hand, if we | |
3896 | get a non-SIGSTOP, report it to the user - assume the backend | |
3897 | will handle the SIGSTOP if it should show up later. | |
3898 | ||
3899 | Also consider that the attach is complete when we see a | |
3900 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
3901 | target extended-remote report it instead of a SIGSTOP | |
3902 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
3903 | signal, so this is no exception. | |
3904 | ||
3905 | Also consider that the attach is complete when we see a | |
3906 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
3907 | the target to stop all threads of the inferior, in case the | |
3908 | low level attach operation doesn't stop them implicitly. If | |
3909 | they weren't stopped implicitly, then the stub will report a | |
3910 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
3911 | other than GDB's request. */ | |
3912 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
3913 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
3914 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
3915 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
3916 | { | |
3917 | stop_print_frame = 1; | |
3918 | stop_stepping (ecs); | |
3919 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
3920 | return; | |
3921 | } | |
3922 | ||
488f131b | 3923 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
3924 | so, then switch to that thread. */ |
3925 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 3926 | { |
527159b7 | 3927 | if (debug_infrun) |
8a9de0e4 | 3928 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 3929 | |
0d1e5fa7 | 3930 | context_switch (ecs->ptid); |
c5aa993b | 3931 | |
9a4105ab AC |
3932 | if (deprecated_context_hook) |
3933 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 3934 | } |
c906108c | 3935 | |
568d6575 UW |
3936 | /* At this point, get hold of the now-current thread's frame. */ |
3937 | frame = get_current_frame (); | |
3938 | gdbarch = get_frame_arch (frame); | |
3939 | ||
2adfaa28 | 3940 | /* Pull the single step breakpoints out of the target. */ |
1c0fdd0e | 3941 | if (singlestep_breakpoints_inserted_p) |
488f131b | 3942 | { |
2adfaa28 PA |
3943 | /* However, before doing so, if this single-step breakpoint was |
3944 | actually for another thread, set this thread up for moving | |
3945 | past it. */ | |
3946 | if (!ptid_equal (ecs->ptid, singlestep_ptid) | |
3947 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
3948 | { | |
3949 | struct regcache *regcache; | |
3950 | struct address_space *aspace; | |
3951 | CORE_ADDR pc; | |
3952 | ||
3953 | regcache = get_thread_regcache (ecs->ptid); | |
3954 | aspace = get_regcache_aspace (regcache); | |
3955 | pc = regcache_read_pc (regcache); | |
3956 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
3957 | { | |
3958 | if (debug_infrun) | |
3959 | { | |
3960 | fprintf_unfiltered (gdb_stdlog, | |
3961 | "infrun: [%s] hit step over single-step" | |
3962 | " breakpoint of [%s]\n", | |
3963 | target_pid_to_str (ecs->ptid), | |
3964 | target_pid_to_str (singlestep_ptid)); | |
3965 | } | |
3966 | ecs->hit_singlestep_breakpoint = 1; | |
3967 | } | |
3968 | } | |
3969 | ||
e0cd558a | 3970 | remove_single_step_breakpoints (); |
488f131b JB |
3971 | singlestep_breakpoints_inserted_p = 0; |
3972 | } | |
c906108c | 3973 | |
4f5d7f63 | 3974 | if (ecs->stepped_after_stopped_by_watchpoint) |
d983da9c DJ |
3975 | stopped_by_watchpoint = 0; |
3976 | else | |
3977 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
3978 | ||
3979 | /* If necessary, step over this watchpoint. We'll be back to display | |
3980 | it in a moment. */ | |
3981 | if (stopped_by_watchpoint | |
d92524f1 | 3982 | && (target_have_steppable_watchpoint |
568d6575 | 3983 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 3984 | { |
488f131b JB |
3985 | /* At this point, we are stopped at an instruction which has |
3986 | attempted to write to a piece of memory under control of | |
3987 | a watchpoint. The instruction hasn't actually executed | |
3988 | yet. If we were to evaluate the watchpoint expression | |
3989 | now, we would get the old value, and therefore no change | |
3990 | would seem to have occurred. | |
3991 | ||
3992 | In order to make watchpoints work `right', we really need | |
3993 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
3994 | watchpoint expression. We do this by single-stepping the |
3995 | target. | |
3996 | ||
3997 | It may not be necessary to disable the watchpoint to stop over | |
3998 | it. For example, the PA can (with some kernel cooperation) | |
3999 | single step over a watchpoint without disabling the watchpoint. | |
4000 | ||
4001 | It is far more common to need to disable a watchpoint to step | |
4002 | the inferior over it. If we have non-steppable watchpoints, | |
4003 | we must disable the current watchpoint; it's simplest to | |
4004 | disable all watchpoints and breakpoints. */ | |
2facfe5c DD |
4005 | int hw_step = 1; |
4006 | ||
d92524f1 | 4007 | if (!target_have_steppable_watchpoint) |
2455069d UW |
4008 | { |
4009 | remove_breakpoints (); | |
4010 | /* See comment in resume why we need to stop bypassing signals | |
4011 | while breakpoints have been removed. */ | |
4012 | target_pass_signals (0, NULL); | |
4013 | } | |
2facfe5c | 4014 | /* Single step */ |
568d6575 | 4015 | hw_step = maybe_software_singlestep (gdbarch, stop_pc); |
a493e3e2 | 4016 | target_resume (ecs->ptid, hw_step, GDB_SIGNAL_0); |
0d1e5fa7 | 4017 | waiton_ptid = ecs->ptid; |
d92524f1 | 4018 | if (target_have_steppable_watchpoint) |
0d1e5fa7 | 4019 | infwait_state = infwait_step_watch_state; |
d983da9c | 4020 | else |
0d1e5fa7 | 4021 | infwait_state = infwait_nonstep_watch_state; |
488f131b JB |
4022 | prepare_to_wait (ecs); |
4023 | return; | |
4024 | } | |
4025 | ||
4e1c45ea | 4026 | ecs->event_thread->stepping_over_breakpoint = 0; |
16c381f0 JK |
4027 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
4028 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 4029 | stop_print_frame = 1; |
488f131b | 4030 | stopped_by_random_signal = 0; |
488f131b | 4031 | |
edb3359d DJ |
4032 | /* Hide inlined functions starting here, unless we just performed stepi or |
4033 | nexti. After stepi and nexti, always show the innermost frame (not any | |
4034 | inline function call sites). */ | |
16c381f0 | 4035 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f GB |
4036 | { |
4037 | struct address_space *aspace = | |
4038 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
4039 | ||
4040 | /* skip_inline_frames is expensive, so we avoid it if we can | |
4041 | determine that the address is one where functions cannot have | |
4042 | been inlined. This improves performance with inferiors that | |
4043 | load a lot of shared libraries, because the solib event | |
4044 | breakpoint is defined as the address of a function (i.e. not | |
4045 | inline). Note that we have to check the previous PC as well | |
4046 | as the current one to catch cases when we have just | |
4047 | single-stepped off a breakpoint prior to reinstating it. | |
4048 | Note that we're assuming that the code we single-step to is | |
4049 | not inline, but that's not definitive: there's nothing | |
4050 | preventing the event breakpoint function from containing | |
4051 | inlined code, and the single-step ending up there. If the | |
4052 | user had set a breakpoint on that inlined code, the missing | |
4053 | skip_inline_frames call would break things. Fortunately | |
4054 | that's an extremely unlikely scenario. */ | |
09ac7c10 | 4055 | if (!pc_at_non_inline_function (aspace, stop_pc, &ecs->ws) |
a210c238 MR |
4056 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
4057 | && ecs->event_thread->control.trap_expected | |
4058 | && pc_at_non_inline_function (aspace, | |
4059 | ecs->event_thread->prev_pc, | |
09ac7c10 | 4060 | &ecs->ws))) |
1c5a993e MR |
4061 | { |
4062 | skip_inline_frames (ecs->ptid); | |
4063 | ||
4064 | /* Re-fetch current thread's frame in case that invalidated | |
4065 | the frame cache. */ | |
4066 | frame = get_current_frame (); | |
4067 | gdbarch = get_frame_arch (frame); | |
4068 | } | |
0574c78f | 4069 | } |
edb3359d | 4070 | |
a493e3e2 | 4071 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 4072 | && ecs->event_thread->control.trap_expected |
568d6575 | 4073 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 4074 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 4075 | { |
b50d7442 | 4076 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 4077 | also on an instruction that needs to be stepped multiple |
1777feb0 | 4078 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
4079 | with a delay slot. It needs to be stepped twice, once for |
4080 | the instruction and once for the delay slot. */ | |
4081 | int step_through_delay | |
568d6575 | 4082 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 4083 | |
527159b7 | 4084 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 4085 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
4086 | if (ecs->event_thread->control.step_range_end == 0 |
4087 | && step_through_delay) | |
3352ef37 AC |
4088 | { |
4089 | /* The user issued a continue when stopped at a breakpoint. | |
4090 | Set up for another trap and get out of here. */ | |
4e1c45ea | 4091 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
4092 | keep_going (ecs); |
4093 | return; | |
4094 | } | |
4095 | else if (step_through_delay) | |
4096 | { | |
4097 | /* The user issued a step when stopped at a breakpoint. | |
4098 | Maybe we should stop, maybe we should not - the delay | |
4099 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
4100 | case, don't decide that here, just set |
4101 | ecs->stepping_over_breakpoint, making sure we | |
4102 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 4103 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
4104 | } |
4105 | } | |
4106 | ||
ab04a2af TT |
4107 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
4108 | handles this event. */ | |
4109 | ecs->event_thread->control.stop_bpstat | |
4110 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
4111 | stop_pc, ecs->ptid, &ecs->ws); | |
db82e815 | 4112 | |
ab04a2af TT |
4113 | /* Following in case break condition called a |
4114 | function. */ | |
4115 | stop_print_frame = 1; | |
73dd234f | 4116 | |
ab04a2af TT |
4117 | /* This is where we handle "moribund" watchpoints. Unlike |
4118 | software breakpoints traps, hardware watchpoint traps are | |
4119 | always distinguishable from random traps. If no high-level | |
4120 | watchpoint is associated with the reported stop data address | |
4121 | anymore, then the bpstat does not explain the signal --- | |
4122 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
4123 | set. */ | |
4124 | ||
4125 | if (debug_infrun | |
4126 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 4127 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 4128 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
4129 | && stopped_by_watchpoint) |
4130 | fprintf_unfiltered (gdb_stdlog, | |
4131 | "infrun: no user watchpoint explains " | |
4132 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 4133 | |
bac7d97b | 4134 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
4135 | at one stage in the past included checks for an inferior |
4136 | function call's call dummy's return breakpoint. The original | |
4137 | comment, that went with the test, read: | |
03cebad2 | 4138 | |
ab04a2af TT |
4139 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
4140 | another signal besides SIGTRAP, so check here as well as | |
4141 | above.'' | |
73dd234f | 4142 | |
ab04a2af TT |
4143 | If someone ever tries to get call dummys on a |
4144 | non-executable stack to work (where the target would stop | |
4145 | with something like a SIGSEGV), then those tests might need | |
4146 | to be re-instated. Given, however, that the tests were only | |
4147 | enabled when momentary breakpoints were not being used, I | |
4148 | suspect that it won't be the case. | |
488f131b | 4149 | |
ab04a2af TT |
4150 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
4151 | be necessary for call dummies on a non-executable stack on | |
4152 | SPARC. */ | |
488f131b | 4153 | |
bac7d97b | 4154 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
4155 | random_signal |
4156 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
4157 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b PA |
4158 | |
4159 | /* If not, perhaps stepping/nexting can. */ | |
4160 | if (random_signal) | |
4161 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
4162 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 4163 | |
2adfaa28 PA |
4164 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
4165 | thread. Single-step breakpoints are transparent to the | |
4166 | breakpoints module. */ | |
4167 | if (random_signal) | |
4168 | random_signal = !ecs->hit_singlestep_breakpoint; | |
4169 | ||
bac7d97b PA |
4170 | /* No? Perhaps we got a moribund watchpoint. */ |
4171 | if (random_signal) | |
4172 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 4173 | |
488f131b JB |
4174 | /* For the program's own signals, act according to |
4175 | the signal handling tables. */ | |
4176 | ||
ce12b012 | 4177 | if (random_signal) |
488f131b JB |
4178 | { |
4179 | /* Signal not for debugging purposes. */ | |
4180 | int printed = 0; | |
24291992 | 4181 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); |
c9737c08 | 4182 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 4183 | |
527159b7 | 4184 | if (debug_infrun) |
c9737c08 PA |
4185 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
4186 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 4187 | |
488f131b JB |
4188 | stopped_by_random_signal = 1; |
4189 | ||
16c381f0 | 4190 | if (signal_print[ecs->event_thread->suspend.stop_signal]) |
488f131b JB |
4191 | { |
4192 | printed = 1; | |
4193 | target_terminal_ours_for_output (); | |
16c381f0 JK |
4194 | print_signal_received_reason |
4195 | (ecs->event_thread->suspend.stop_signal); | |
488f131b | 4196 | } |
252fbfc8 PA |
4197 | /* Always stop on signals if we're either just gaining control |
4198 | of the program, or the user explicitly requested this thread | |
4199 | to remain stopped. */ | |
d6b48e9c | 4200 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 4201 | || ecs->event_thread->stop_requested |
24291992 | 4202 | || (!inf->detaching |
16c381f0 | 4203 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b JB |
4204 | { |
4205 | stop_stepping (ecs); | |
4206 | return; | |
4207 | } | |
4208 | /* If not going to stop, give terminal back | |
4209 | if we took it away. */ | |
4210 | else if (printed) | |
4211 | target_terminal_inferior (); | |
4212 | ||
4213 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 4214 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 4215 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 4216 | |
fb14de7b | 4217 | if (ecs->event_thread->prev_pc == stop_pc |
16c381f0 | 4218 | && ecs->event_thread->control.trap_expected |
8358c15c | 4219 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
4220 | { |
4221 | /* We were just starting a new sequence, attempting to | |
4222 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 4223 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
4224 | of the stepping range so GDB needs to remember to, when |
4225 | the signal handler returns, resume stepping off that | |
4226 | breakpoint. */ | |
4227 | /* To simplify things, "continue" is forced to use the same | |
4228 | code paths as single-step - set a breakpoint at the | |
4229 | signal return address and then, once hit, step off that | |
4230 | breakpoint. */ | |
237fc4c9 PA |
4231 | if (debug_infrun) |
4232 | fprintf_unfiltered (gdb_stdlog, | |
4233 | "infrun: signal arrived while stepping over " | |
4234 | "breakpoint\n"); | |
d3169d93 | 4235 | |
2c03e5be | 4236 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 4237 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
4238 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
4239 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
4240 | |
4241 | /* If we were nexting/stepping some other thread, switch to | |
4242 | it, so that we don't continue it, losing control. */ | |
4243 | if (!switch_back_to_stepped_thread (ecs)) | |
4244 | keep_going (ecs); | |
9d799f85 | 4245 | return; |
68f53502 | 4246 | } |
9d799f85 | 4247 | |
16c381f0 | 4248 | if (ecs->event_thread->control.step_range_end != 0 |
a493e3e2 | 4249 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
ce4c476a | 4250 | && pc_in_thread_step_range (stop_pc, ecs->event_thread) |
edb3359d | 4251 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 4252 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 4253 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
4254 | { |
4255 | /* The inferior is about to take a signal that will take it | |
4256 | out of the single step range. Set a breakpoint at the | |
4257 | current PC (which is presumably where the signal handler | |
4258 | will eventually return) and then allow the inferior to | |
4259 | run free. | |
4260 | ||
4261 | Note that this is only needed for a signal delivered | |
4262 | while in the single-step range. Nested signals aren't a | |
4263 | problem as they eventually all return. */ | |
237fc4c9 PA |
4264 | if (debug_infrun) |
4265 | fprintf_unfiltered (gdb_stdlog, | |
4266 | "infrun: signal may take us out of " | |
4267 | "single-step range\n"); | |
4268 | ||
2c03e5be | 4269 | insert_hp_step_resume_breakpoint_at_frame (frame); |
2455069d UW |
4270 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
4271 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
4272 | keep_going (ecs); |
4273 | return; | |
d303a6c7 | 4274 | } |
9d799f85 AC |
4275 | |
4276 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
4277 | when either there's a nested signal, or when there's a | |
4278 | pending signal enabled just as the signal handler returns | |
4279 | (leaving the inferior at the step-resume-breakpoint without | |
4280 | actually executing it). Either way continue until the | |
4281 | breakpoint is really hit. */ | |
c447ac0b PA |
4282 | |
4283 | if (!switch_back_to_stepped_thread (ecs)) | |
4284 | { | |
4285 | if (debug_infrun) | |
4286 | fprintf_unfiltered (gdb_stdlog, | |
4287 | "infrun: random signal, keep going\n"); | |
4288 | ||
4289 | keep_going (ecs); | |
4290 | } | |
4291 | return; | |
488f131b | 4292 | } |
94c57d6a PA |
4293 | |
4294 | process_event_stop_test (ecs); | |
4295 | } | |
4296 | ||
4297 | /* Come here when we've got some debug event / signal we can explain | |
4298 | (IOW, not a random signal), and test whether it should cause a | |
4299 | stop, or whether we should resume the inferior (transparently). | |
4300 | E.g., could be a breakpoint whose condition evaluates false; we | |
4301 | could be still stepping within the line; etc. */ | |
4302 | ||
4303 | static void | |
4304 | process_event_stop_test (struct execution_control_state *ecs) | |
4305 | { | |
4306 | struct symtab_and_line stop_pc_sal; | |
4307 | struct frame_info *frame; | |
4308 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
4309 | CORE_ADDR jmp_buf_pc; |
4310 | struct bpstat_what what; | |
94c57d6a | 4311 | |
cdaa5b73 | 4312 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 4313 | |
cdaa5b73 PA |
4314 | frame = get_current_frame (); |
4315 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 4316 | |
cdaa5b73 | 4317 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 4318 | |
cdaa5b73 PA |
4319 | if (what.call_dummy) |
4320 | { | |
4321 | stop_stack_dummy = what.call_dummy; | |
4322 | } | |
186c406b | 4323 | |
cdaa5b73 PA |
4324 | /* If we hit an internal event that triggers symbol changes, the |
4325 | current frame will be invalidated within bpstat_what (e.g., if we | |
4326 | hit an internal solib event). Re-fetch it. */ | |
4327 | frame = get_current_frame (); | |
4328 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 4329 | |
cdaa5b73 PA |
4330 | switch (what.main_action) |
4331 | { | |
4332 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
4333 | /* If we hit the breakpoint at longjmp while stepping, we | |
4334 | install a momentary breakpoint at the target of the | |
4335 | jmp_buf. */ | |
186c406b | 4336 | |
cdaa5b73 PA |
4337 | if (debug_infrun) |
4338 | fprintf_unfiltered (gdb_stdlog, | |
4339 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 4340 | |
cdaa5b73 | 4341 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 4342 | |
cdaa5b73 PA |
4343 | if (what.is_longjmp) |
4344 | { | |
4345 | struct value *arg_value; | |
4346 | ||
4347 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
4348 | then use it to extract the arguments. The destination PC | |
4349 | is the third argument to the probe. */ | |
4350 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
4351 | if (arg_value) | |
4352 | jmp_buf_pc = value_as_address (arg_value); | |
4353 | else if (!gdbarch_get_longjmp_target_p (gdbarch) | |
4354 | || !gdbarch_get_longjmp_target (gdbarch, | |
4355 | frame, &jmp_buf_pc)) | |
e2e4d78b | 4356 | { |
cdaa5b73 PA |
4357 | if (debug_infrun) |
4358 | fprintf_unfiltered (gdb_stdlog, | |
4359 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
4360 | "(!gdbarch_get_longjmp_target)\n"); | |
4361 | keep_going (ecs); | |
4362 | return; | |
e2e4d78b | 4363 | } |
e2e4d78b | 4364 | |
cdaa5b73 PA |
4365 | /* Insert a breakpoint at resume address. */ |
4366 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
4367 | } | |
4368 | else | |
4369 | check_exception_resume (ecs, frame); | |
4370 | keep_going (ecs); | |
4371 | return; | |
e81a37f7 | 4372 | |
cdaa5b73 PA |
4373 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
4374 | { | |
4375 | struct frame_info *init_frame; | |
e81a37f7 | 4376 | |
cdaa5b73 | 4377 | /* There are several cases to consider. |
c906108c | 4378 | |
cdaa5b73 PA |
4379 | 1. The initiating frame no longer exists. In this case we |
4380 | must stop, because the exception or longjmp has gone too | |
4381 | far. | |
2c03e5be | 4382 | |
cdaa5b73 PA |
4383 | 2. The initiating frame exists, and is the same as the |
4384 | current frame. We stop, because the exception or longjmp | |
4385 | has been caught. | |
2c03e5be | 4386 | |
cdaa5b73 PA |
4387 | 3. The initiating frame exists and is different from the |
4388 | current frame. This means the exception or longjmp has | |
4389 | been caught beneath the initiating frame, so keep going. | |
c906108c | 4390 | |
cdaa5b73 PA |
4391 | 4. longjmp breakpoint has been placed just to protect |
4392 | against stale dummy frames and user is not interested in | |
4393 | stopping around longjmps. */ | |
c5aa993b | 4394 | |
cdaa5b73 PA |
4395 | if (debug_infrun) |
4396 | fprintf_unfiltered (gdb_stdlog, | |
4397 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 4398 | |
cdaa5b73 PA |
4399 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
4400 | != NULL); | |
4401 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 4402 | |
cdaa5b73 PA |
4403 | if (what.is_longjmp) |
4404 | { | |
4405 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread->num); | |
c5aa993b | 4406 | |
cdaa5b73 | 4407 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 4408 | { |
cdaa5b73 PA |
4409 | /* Case 4. */ |
4410 | keep_going (ecs); | |
4411 | return; | |
e5ef252a | 4412 | } |
cdaa5b73 | 4413 | } |
c5aa993b | 4414 | |
cdaa5b73 | 4415 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 4416 | |
cdaa5b73 PA |
4417 | if (init_frame) |
4418 | { | |
4419 | struct frame_id current_id | |
4420 | = get_frame_id (get_current_frame ()); | |
4421 | if (frame_id_eq (current_id, | |
4422 | ecs->event_thread->initiating_frame)) | |
4423 | { | |
4424 | /* Case 2. Fall through. */ | |
4425 | } | |
4426 | else | |
4427 | { | |
4428 | /* Case 3. */ | |
4429 | keep_going (ecs); | |
4430 | return; | |
4431 | } | |
68f53502 | 4432 | } |
488f131b | 4433 | |
cdaa5b73 PA |
4434 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
4435 | exists. */ | |
4436 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 4437 | |
cdaa5b73 PA |
4438 | ecs->event_thread->control.stop_step = 1; |
4439 | print_end_stepping_range_reason (); | |
4440 | stop_stepping (ecs); | |
4441 | } | |
4442 | return; | |
e5ef252a | 4443 | |
cdaa5b73 PA |
4444 | case BPSTAT_WHAT_SINGLE: |
4445 | if (debug_infrun) | |
4446 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
4447 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4448 | /* Still need to check other stuff, at least the case where we | |
4449 | are stepping and step out of the right range. */ | |
4450 | break; | |
e5ef252a | 4451 | |
cdaa5b73 PA |
4452 | case BPSTAT_WHAT_STEP_RESUME: |
4453 | if (debug_infrun) | |
4454 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 4455 | |
cdaa5b73 PA |
4456 | delete_step_resume_breakpoint (ecs->event_thread); |
4457 | if (ecs->event_thread->control.proceed_to_finish | |
4458 | && execution_direction == EXEC_REVERSE) | |
4459 | { | |
4460 | struct thread_info *tp = ecs->event_thread; | |
4461 | ||
4462 | /* We are finishing a function in reverse, and just hit the | |
4463 | step-resume breakpoint at the start address of the | |
4464 | function, and we're almost there -- just need to back up | |
4465 | by one more single-step, which should take us back to the | |
4466 | function call. */ | |
4467 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
4468 | keep_going (ecs); | |
e5ef252a | 4469 | return; |
cdaa5b73 PA |
4470 | } |
4471 | fill_in_stop_func (gdbarch, ecs); | |
4472 | if (stop_pc == ecs->stop_func_start | |
4473 | && execution_direction == EXEC_REVERSE) | |
4474 | { | |
4475 | /* We are stepping over a function call in reverse, and just | |
4476 | hit the step-resume breakpoint at the start address of | |
4477 | the function. Go back to single-stepping, which should | |
4478 | take us back to the function call. */ | |
4479 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4480 | keep_going (ecs); | |
4481 | return; | |
4482 | } | |
4483 | break; | |
e5ef252a | 4484 | |
cdaa5b73 PA |
4485 | case BPSTAT_WHAT_STOP_NOISY: |
4486 | if (debug_infrun) | |
4487 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
4488 | stop_print_frame = 1; | |
e5ef252a | 4489 | |
99619bea PA |
4490 | /* Assume the thread stopped for a breapoint. We'll still check |
4491 | whether a/the breakpoint is there when the thread is next | |
4492 | resumed. */ | |
4493 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 4494 | |
cdaa5b73 PA |
4495 | stop_stepping (ecs); |
4496 | return; | |
e5ef252a | 4497 | |
cdaa5b73 PA |
4498 | case BPSTAT_WHAT_STOP_SILENT: |
4499 | if (debug_infrun) | |
4500 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
4501 | stop_print_frame = 0; | |
e5ef252a | 4502 | |
99619bea PA |
4503 | /* Assume the thread stopped for a breapoint. We'll still check |
4504 | whether a/the breakpoint is there when the thread is next | |
4505 | resumed. */ | |
4506 | ecs->event_thread->stepping_over_breakpoint = 1; | |
cdaa5b73 PA |
4507 | stop_stepping (ecs); |
4508 | return; | |
4509 | ||
4510 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
4511 | if (debug_infrun) | |
4512 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
4513 | ||
4514 | delete_step_resume_breakpoint (ecs->event_thread); | |
4515 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
4516 | { | |
4517 | /* Back when the step-resume breakpoint was inserted, we | |
4518 | were trying to single-step off a breakpoint. Go back to | |
4519 | doing that. */ | |
4520 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
4521 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4522 | keep_going (ecs); | |
4523 | return; | |
e5ef252a | 4524 | } |
cdaa5b73 PA |
4525 | break; |
4526 | ||
4527 | case BPSTAT_WHAT_KEEP_CHECKING: | |
4528 | break; | |
e5ef252a | 4529 | } |
c906108c | 4530 | |
cdaa5b73 PA |
4531 | /* We come here if we hit a breakpoint but should not stop for it. |
4532 | Possibly we also were stepping and should stop for that. So fall | |
4533 | through and test for stepping. But, if not stepping, do not | |
4534 | stop. */ | |
c906108c | 4535 | |
a7212384 UW |
4536 | /* In all-stop mode, if we're currently stepping but have stopped in |
4537 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
4538 | if (switch_back_to_stepped_thread (ecs)) |
4539 | return; | |
776f04fa | 4540 | |
8358c15c | 4541 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 4542 | { |
527159b7 | 4543 | if (debug_infrun) |
d3169d93 DJ |
4544 | fprintf_unfiltered (gdb_stdlog, |
4545 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 4546 | |
488f131b JB |
4547 | /* Having a step-resume breakpoint overrides anything |
4548 | else having to do with stepping commands until | |
4549 | that breakpoint is reached. */ | |
488f131b JB |
4550 | keep_going (ecs); |
4551 | return; | |
4552 | } | |
c5aa993b | 4553 | |
16c381f0 | 4554 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 4555 | { |
527159b7 | 4556 | if (debug_infrun) |
8a9de0e4 | 4557 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 4558 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
4559 | keep_going (ecs); |
4560 | return; | |
4561 | } | |
c5aa993b | 4562 | |
4b7703ad JB |
4563 | /* Re-fetch current thread's frame in case the code above caused |
4564 | the frame cache to be re-initialized, making our FRAME variable | |
4565 | a dangling pointer. */ | |
4566 | frame = get_current_frame (); | |
628fe4e4 | 4567 | gdbarch = get_frame_arch (frame); |
7e324e48 | 4568 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 4569 | |
488f131b | 4570 | /* If stepping through a line, keep going if still within it. |
c906108c | 4571 | |
488f131b JB |
4572 | Note that step_range_end is the address of the first instruction |
4573 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
4574 | within it! |
4575 | ||
4576 | Note also that during reverse execution, we may be stepping | |
4577 | through a function epilogue and therefore must detect when | |
4578 | the current-frame changes in the middle of a line. */ | |
4579 | ||
ce4c476a | 4580 | if (pc_in_thread_step_range (stop_pc, ecs->event_thread) |
31410e84 | 4581 | && (execution_direction != EXEC_REVERSE |
388a8562 | 4582 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 4583 | ecs->event_thread->control.step_frame_id))) |
488f131b | 4584 | { |
527159b7 | 4585 | if (debug_infrun) |
5af949e3 UW |
4586 | fprintf_unfiltered |
4587 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
4588 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
4589 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 4590 | |
c1e36e3e PA |
4591 | /* Tentatively re-enable range stepping; `resume' disables it if |
4592 | necessary (e.g., if we're stepping over a breakpoint or we | |
4593 | have software watchpoints). */ | |
4594 | ecs->event_thread->control.may_range_step = 1; | |
4595 | ||
b2175913 MS |
4596 | /* When stepping backward, stop at beginning of line range |
4597 | (unless it's the function entry point, in which case | |
4598 | keep going back to the call point). */ | |
16c381f0 | 4599 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
4600 | && stop_pc != ecs->stop_func_start |
4601 | && execution_direction == EXEC_REVERSE) | |
4602 | { | |
16c381f0 | 4603 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 4604 | print_end_stepping_range_reason (); |
b2175913 MS |
4605 | stop_stepping (ecs); |
4606 | } | |
4607 | else | |
4608 | keep_going (ecs); | |
4609 | ||
488f131b JB |
4610 | return; |
4611 | } | |
c5aa993b | 4612 | |
488f131b | 4613 | /* We stepped out of the stepping range. */ |
c906108c | 4614 | |
488f131b | 4615 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
4616 | loader dynamic symbol resolution code... |
4617 | ||
4618 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
4619 | time loader code and reach the callee's address. | |
4620 | ||
4621 | EXEC_REVERSE: we've already executed the callee (backward), and | |
4622 | the runtime loader code is handled just like any other | |
4623 | undebuggable function call. Now we need only keep stepping | |
4624 | backward through the trampoline code, and that's handled further | |
4625 | down, so there is nothing for us to do here. */ | |
4626 | ||
4627 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 4628 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
cfd8ab24 | 4629 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 4630 | { |
4c8c40e6 | 4631 | CORE_ADDR pc_after_resolver = |
568d6575 | 4632 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); |
c906108c | 4633 | |
527159b7 | 4634 | if (debug_infrun) |
3e43a32a MS |
4635 | fprintf_unfiltered (gdb_stdlog, |
4636 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 4637 | |
488f131b JB |
4638 | if (pc_after_resolver) |
4639 | { | |
4640 | /* Set up a step-resume breakpoint at the address | |
4641 | indicated by SKIP_SOLIB_RESOLVER. */ | |
4642 | struct symtab_and_line sr_sal; | |
abbb1732 | 4643 | |
fe39c653 | 4644 | init_sal (&sr_sal); |
488f131b | 4645 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 4646 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 4647 | |
a6d9a66e UW |
4648 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4649 | sr_sal, null_frame_id); | |
c5aa993b | 4650 | } |
c906108c | 4651 | |
488f131b JB |
4652 | keep_going (ecs); |
4653 | return; | |
4654 | } | |
c906108c | 4655 | |
16c381f0 JK |
4656 | if (ecs->event_thread->control.step_range_end != 1 |
4657 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
4658 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 4659 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 4660 | { |
527159b7 | 4661 | if (debug_infrun) |
3e43a32a MS |
4662 | fprintf_unfiltered (gdb_stdlog, |
4663 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 4664 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
4665 | a signal trampoline (either by a signal being delivered or by |
4666 | the signal handler returning). Just single-step until the | |
4667 | inferior leaves the trampoline (either by calling the handler | |
4668 | or returning). */ | |
488f131b JB |
4669 | keep_going (ecs); |
4670 | return; | |
4671 | } | |
c906108c | 4672 | |
14132e89 MR |
4673 | /* If we're in the return path from a shared library trampoline, |
4674 | we want to proceed through the trampoline when stepping. */ | |
4675 | /* macro/2012-04-25: This needs to come before the subroutine | |
4676 | call check below as on some targets return trampolines look | |
4677 | like subroutine calls (MIPS16 return thunks). */ | |
4678 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
4679 | stop_pc, ecs->stop_func_name) | |
4680 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) | |
4681 | { | |
4682 | /* Determine where this trampoline returns. */ | |
4683 | CORE_ADDR real_stop_pc; | |
4684 | ||
4685 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
4686 | ||
4687 | if (debug_infrun) | |
4688 | fprintf_unfiltered (gdb_stdlog, | |
4689 | "infrun: stepped into solib return tramp\n"); | |
4690 | ||
4691 | /* Only proceed through if we know where it's going. */ | |
4692 | if (real_stop_pc) | |
4693 | { | |
4694 | /* And put the step-breakpoint there and go until there. */ | |
4695 | struct symtab_and_line sr_sal; | |
4696 | ||
4697 | init_sal (&sr_sal); /* initialize to zeroes */ | |
4698 | sr_sal.pc = real_stop_pc; | |
4699 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
4700 | sr_sal.pspace = get_frame_program_space (frame); | |
4701 | ||
4702 | /* Do not specify what the fp should be when we stop since | |
4703 | on some machines the prologue is where the new fp value | |
4704 | is established. */ | |
4705 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
4706 | sr_sal, null_frame_id); | |
4707 | ||
4708 | /* Restart without fiddling with the step ranges or | |
4709 | other state. */ | |
4710 | keep_going (ecs); | |
4711 | return; | |
4712 | } | |
4713 | } | |
4714 | ||
c17eaafe DJ |
4715 | /* Check for subroutine calls. The check for the current frame |
4716 | equalling the step ID is not necessary - the check of the | |
4717 | previous frame's ID is sufficient - but it is a common case and | |
4718 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
4719 | |
4720 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
4721 | being equal, so to get into this block, both the current and | |
4722 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
4723 | /* The outer_frame_id check is a heuristic to detect stepping |
4724 | through startup code. If we step over an instruction which | |
4725 | sets the stack pointer from an invalid value to a valid value, | |
4726 | we may detect that as a subroutine call from the mythical | |
4727 | "outermost" function. This could be fixed by marking | |
4728 | outermost frames as !stack_p,code_p,special_p. Then the | |
4729 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 4730 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 4731 | for more. */ |
edb3359d | 4732 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 4733 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 4734 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
4735 | ecs->event_thread->control.step_stack_frame_id) |
4736 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a JB |
4737 | outer_frame_id) |
4738 | || step_start_function != find_pc_function (stop_pc)))) | |
488f131b | 4739 | { |
95918acb | 4740 | CORE_ADDR real_stop_pc; |
8fb3e588 | 4741 | |
527159b7 | 4742 | if (debug_infrun) |
8a9de0e4 | 4743 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 4744 | |
16c381f0 JK |
4745 | if ((ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
4746 | || ((ecs->event_thread->control.step_range_end == 1) | |
d80b854b | 4747 | && in_prologue (gdbarch, ecs->event_thread->prev_pc, |
4e1c45ea | 4748 | ecs->stop_func_start))) |
95918acb AC |
4749 | { |
4750 | /* I presume that step_over_calls is only 0 when we're | |
4751 | supposed to be stepping at the assembly language level | |
4752 | ("stepi"). Just stop. */ | |
4753 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
4754 | thought it was a subroutine call but it was not. Stop as | |
4755 | well. FENN */ | |
388a8562 | 4756 | /* And this works the same backward as frontward. MVS */ |
16c381f0 | 4757 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 4758 | print_end_stepping_range_reason (); |
95918acb AC |
4759 | stop_stepping (ecs); |
4760 | return; | |
4761 | } | |
8fb3e588 | 4762 | |
388a8562 MS |
4763 | /* Reverse stepping through solib trampolines. */ |
4764 | ||
4765 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 4766 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
4767 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
4768 | || (ecs->stop_func_start == 0 | |
4769 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
4770 | { | |
4771 | /* Any solib trampoline code can be handled in reverse | |
4772 | by simply continuing to single-step. We have already | |
4773 | executed the solib function (backwards), and a few | |
4774 | steps will take us back through the trampoline to the | |
4775 | caller. */ | |
4776 | keep_going (ecs); | |
4777 | return; | |
4778 | } | |
4779 | ||
16c381f0 | 4780 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 4781 | { |
b2175913 MS |
4782 | /* We're doing a "next". |
4783 | ||
4784 | Normal (forward) execution: set a breakpoint at the | |
4785 | callee's return address (the address at which the caller | |
4786 | will resume). | |
4787 | ||
4788 | Reverse (backward) execution. set the step-resume | |
4789 | breakpoint at the start of the function that we just | |
4790 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 4791 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
4792 | |
4793 | if (execution_direction == EXEC_REVERSE) | |
4794 | { | |
acf9414f JK |
4795 | /* If we're already at the start of the function, we've either |
4796 | just stepped backward into a single instruction function, | |
4797 | or stepped back out of a signal handler to the first instruction | |
4798 | of the function. Just keep going, which will single-step back | |
4799 | to the caller. */ | |
58c48e72 | 4800 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f JK |
4801 | { |
4802 | struct symtab_and_line sr_sal; | |
4803 | ||
4804 | /* Normal function call return (static or dynamic). */ | |
4805 | init_sal (&sr_sal); | |
4806 | sr_sal.pc = ecs->stop_func_start; | |
4807 | sr_sal.pspace = get_frame_program_space (frame); | |
4808 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
4809 | sr_sal, null_frame_id); | |
4810 | } | |
b2175913 MS |
4811 | } |
4812 | else | |
568d6575 | 4813 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 4814 | |
8567c30f AC |
4815 | keep_going (ecs); |
4816 | return; | |
4817 | } | |
a53c66de | 4818 | |
95918acb | 4819 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
4820 | calling routine and the real function), locate the real |
4821 | function. That's what tells us (a) whether we want to step | |
4822 | into it at all, and (b) what prologue we want to run to the | |
4823 | end of, if we do step into it. */ | |
568d6575 | 4824 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 4825 | if (real_stop_pc == 0) |
568d6575 | 4826 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
4827 | if (real_stop_pc != 0) |
4828 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 4829 | |
db5f024e | 4830 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 RC |
4831 | { |
4832 | struct symtab_and_line sr_sal; | |
abbb1732 | 4833 | |
1b2bfbb9 RC |
4834 | init_sal (&sr_sal); |
4835 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 4836 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 4837 | |
a6d9a66e UW |
4838 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4839 | sr_sal, null_frame_id); | |
8fb3e588 AC |
4840 | keep_going (ecs); |
4841 | return; | |
1b2bfbb9 RC |
4842 | } |
4843 | ||
95918acb | 4844 | /* If we have line number information for the function we are |
1bfeeb0f JL |
4845 | thinking of stepping into and the function isn't on the skip |
4846 | list, step into it. | |
95918acb | 4847 | |
8fb3e588 AC |
4848 | If there are several symtabs at that PC (e.g. with include |
4849 | files), just want to know whether *any* of them have line | |
4850 | numbers. find_pc_line handles this. */ | |
95918acb AC |
4851 | { |
4852 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 4853 | |
95918acb | 4854 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 4855 | if (tmp_sal.line != 0 |
85817405 JK |
4856 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4857 | &tmp_sal)) | |
95918acb | 4858 | { |
b2175913 | 4859 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 4860 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 4861 | else |
568d6575 | 4862 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
4863 | return; |
4864 | } | |
4865 | } | |
4866 | ||
4867 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
4868 | set, we stop the step so that the user has a chance to switch |
4869 | in assembly mode. */ | |
16c381f0 | 4870 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 4871 | && step_stop_if_no_debug) |
95918acb | 4872 | { |
16c381f0 | 4873 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 4874 | print_end_stepping_range_reason (); |
95918acb AC |
4875 | stop_stepping (ecs); |
4876 | return; | |
4877 | } | |
4878 | ||
b2175913 MS |
4879 | if (execution_direction == EXEC_REVERSE) |
4880 | { | |
acf9414f JK |
4881 | /* If we're already at the start of the function, we've either just |
4882 | stepped backward into a single instruction function without line | |
4883 | number info, or stepped back out of a signal handler to the first | |
4884 | instruction of the function without line number info. Just keep | |
4885 | going, which will single-step back to the caller. */ | |
4886 | if (ecs->stop_func_start != stop_pc) | |
4887 | { | |
4888 | /* Set a breakpoint at callee's start address. | |
4889 | From there we can step once and be back in the caller. */ | |
4890 | struct symtab_and_line sr_sal; | |
abbb1732 | 4891 | |
acf9414f JK |
4892 | init_sal (&sr_sal); |
4893 | sr_sal.pc = ecs->stop_func_start; | |
4894 | sr_sal.pspace = get_frame_program_space (frame); | |
4895 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
4896 | sr_sal, null_frame_id); | |
4897 | } | |
b2175913 MS |
4898 | } |
4899 | else | |
4900 | /* Set a breakpoint at callee's return address (the address | |
4901 | at which the caller will resume). */ | |
568d6575 | 4902 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 4903 | |
95918acb | 4904 | keep_going (ecs); |
488f131b | 4905 | return; |
488f131b | 4906 | } |
c906108c | 4907 | |
fdd654f3 MS |
4908 | /* Reverse stepping through solib trampolines. */ |
4909 | ||
4910 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 4911 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 MS |
4912 | { |
4913 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
4914 | || (ecs->stop_func_start == 0 | |
4915 | && in_solib_dynsym_resolve_code (stop_pc))) | |
4916 | { | |
4917 | /* Any solib trampoline code can be handled in reverse | |
4918 | by simply continuing to single-step. We have already | |
4919 | executed the solib function (backwards), and a few | |
4920 | steps will take us back through the trampoline to the | |
4921 | caller. */ | |
4922 | keep_going (ecs); | |
4923 | return; | |
4924 | } | |
4925 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
4926 | { | |
4927 | /* Stepped backward into the solib dynsym resolver. | |
4928 | Set a breakpoint at its start and continue, then | |
4929 | one more step will take us out. */ | |
4930 | struct symtab_and_line sr_sal; | |
abbb1732 | 4931 | |
fdd654f3 MS |
4932 | init_sal (&sr_sal); |
4933 | sr_sal.pc = ecs->stop_func_start; | |
9d1807c3 | 4934 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
4935 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4936 | sr_sal, null_frame_id); | |
4937 | keep_going (ecs); | |
4938 | return; | |
4939 | } | |
4940 | } | |
4941 | ||
2afb61aa | 4942 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 4943 | |
1b2bfbb9 RC |
4944 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
4945 | the trampoline processing logic, however, there are some trampolines | |
4946 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 4947 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 4948 | && ecs->stop_func_name == NULL |
2afb61aa | 4949 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 4950 | { |
527159b7 | 4951 | if (debug_infrun) |
3e43a32a MS |
4952 | fprintf_unfiltered (gdb_stdlog, |
4953 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 4954 | |
1b2bfbb9 | 4955 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
4956 | undebuggable function (where there is no debugging information |
4957 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
4958 | inferior stopped). Since we want to skip this kind of code, |
4959 | we keep going until the inferior returns from this | |
14e60db5 DJ |
4960 | function - unless the user has asked us not to (via |
4961 | set step-mode) or we no longer know how to get back | |
4962 | to the call site. */ | |
4963 | if (step_stop_if_no_debug | |
c7ce8faa | 4964 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
4965 | { |
4966 | /* If we have no line number and the step-stop-if-no-debug | |
4967 | is set, we stop the step so that the user has a chance to | |
4968 | switch in assembly mode. */ | |
16c381f0 | 4969 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 4970 | print_end_stepping_range_reason (); |
1b2bfbb9 RC |
4971 | stop_stepping (ecs); |
4972 | return; | |
4973 | } | |
4974 | else | |
4975 | { | |
4976 | /* Set a breakpoint at callee's return address (the address | |
4977 | at which the caller will resume). */ | |
568d6575 | 4978 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
4979 | keep_going (ecs); |
4980 | return; | |
4981 | } | |
4982 | } | |
4983 | ||
16c381f0 | 4984 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
4985 | { |
4986 | /* It is stepi or nexti. We always want to stop stepping after | |
4987 | one instruction. */ | |
527159b7 | 4988 | if (debug_infrun) |
8a9de0e4 | 4989 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
16c381f0 | 4990 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 4991 | print_end_stepping_range_reason (); |
1b2bfbb9 RC |
4992 | stop_stepping (ecs); |
4993 | return; | |
4994 | } | |
4995 | ||
2afb61aa | 4996 | if (stop_pc_sal.line == 0) |
488f131b JB |
4997 | { |
4998 | /* We have no line number information. That means to stop | |
4999 | stepping (does this always happen right after one instruction, | |
5000 | when we do "s" in a function with no line numbers, | |
5001 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 5002 | if (debug_infrun) |
8a9de0e4 | 5003 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
16c381f0 | 5004 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5005 | print_end_stepping_range_reason (); |
488f131b JB |
5006 | stop_stepping (ecs); |
5007 | return; | |
5008 | } | |
c906108c | 5009 | |
edb3359d DJ |
5010 | /* Look for "calls" to inlined functions, part one. If the inline |
5011 | frame machinery detected some skipped call sites, we have entered | |
5012 | a new inline function. */ | |
5013 | ||
5014 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 5015 | ecs->event_thread->control.step_frame_id) |
edb3359d DJ |
5016 | && inline_skipped_frames (ecs->ptid)) |
5017 | { | |
5018 | struct symtab_and_line call_sal; | |
5019 | ||
5020 | if (debug_infrun) | |
5021 | fprintf_unfiltered (gdb_stdlog, | |
5022 | "infrun: stepped into inlined function\n"); | |
5023 | ||
5024 | find_frame_sal (get_current_frame (), &call_sal); | |
5025 | ||
16c381f0 | 5026 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
5027 | { |
5028 | /* For "step", we're going to stop. But if the call site | |
5029 | for this inlined function is on the same source line as | |
5030 | we were previously stepping, go down into the function | |
5031 | first. Otherwise stop at the call site. */ | |
5032 | ||
5033 | if (call_sal.line == ecs->event_thread->current_line | |
5034 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
5035 | step_into_inline_frame (ecs->ptid); | |
5036 | ||
16c381f0 | 5037 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5038 | print_end_stepping_range_reason (); |
edb3359d DJ |
5039 | stop_stepping (ecs); |
5040 | return; | |
5041 | } | |
5042 | else | |
5043 | { | |
5044 | /* For "next", we should stop at the call site if it is on a | |
5045 | different source line. Otherwise continue through the | |
5046 | inlined function. */ | |
5047 | if (call_sal.line == ecs->event_thread->current_line | |
5048 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
5049 | keep_going (ecs); | |
5050 | else | |
5051 | { | |
16c381f0 | 5052 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5053 | print_end_stepping_range_reason (); |
edb3359d DJ |
5054 | stop_stepping (ecs); |
5055 | } | |
5056 | return; | |
5057 | } | |
5058 | } | |
5059 | ||
5060 | /* Look for "calls" to inlined functions, part two. If we are still | |
5061 | in the same real function we were stepping through, but we have | |
5062 | to go further up to find the exact frame ID, we are stepping | |
5063 | through a more inlined call beyond its call site. */ | |
5064 | ||
5065 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
5066 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 5067 | ecs->event_thread->control.step_frame_id) |
edb3359d | 5068 | && stepped_in_from (get_current_frame (), |
16c381f0 | 5069 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
5070 | { |
5071 | if (debug_infrun) | |
5072 | fprintf_unfiltered (gdb_stdlog, | |
5073 | "infrun: stepping through inlined function\n"); | |
5074 | ||
16c381f0 | 5075 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
5076 | keep_going (ecs); |
5077 | else | |
5078 | { | |
16c381f0 | 5079 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5080 | print_end_stepping_range_reason (); |
edb3359d DJ |
5081 | stop_stepping (ecs); |
5082 | } | |
5083 | return; | |
5084 | } | |
5085 | ||
2afb61aa | 5086 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
5087 | && (ecs->event_thread->current_line != stop_pc_sal.line |
5088 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
5089 | { |
5090 | /* We are at the start of a different line. So stop. Note that | |
5091 | we don't stop if we step into the middle of a different line. | |
5092 | That is said to make things like for (;;) statements work | |
5093 | better. */ | |
527159b7 | 5094 | if (debug_infrun) |
3e43a32a MS |
5095 | fprintf_unfiltered (gdb_stdlog, |
5096 | "infrun: stepped to a different line\n"); | |
16c381f0 | 5097 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5098 | print_end_stepping_range_reason (); |
488f131b JB |
5099 | stop_stepping (ecs); |
5100 | return; | |
5101 | } | |
c906108c | 5102 | |
488f131b | 5103 | /* We aren't done stepping. |
c906108c | 5104 | |
488f131b JB |
5105 | Optimize by setting the stepping range to the line. |
5106 | (We might not be in the original line, but if we entered a | |
5107 | new line in mid-statement, we continue stepping. This makes | |
5108 | things like for(;;) statements work better.) */ | |
c906108c | 5109 | |
16c381f0 JK |
5110 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
5111 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 5112 | ecs->event_thread->control.may_range_step = 1; |
edb3359d | 5113 | set_step_info (frame, stop_pc_sal); |
488f131b | 5114 | |
527159b7 | 5115 | if (debug_infrun) |
8a9de0e4 | 5116 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 5117 | keep_going (ecs); |
104c1213 JM |
5118 | } |
5119 | ||
c447ac0b PA |
5120 | /* In all-stop mode, if we're currently stepping but have stopped in |
5121 | some other thread, we may need to switch back to the stepped | |
5122 | thread. Returns true we set the inferior running, false if we left | |
5123 | it stopped (and the event needs further processing). */ | |
5124 | ||
5125 | static int | |
5126 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
5127 | { | |
5128 | if (!non_stop) | |
5129 | { | |
5130 | struct thread_info *tp; | |
99619bea PA |
5131 | struct thread_info *stepping_thread; |
5132 | ||
5133 | /* If any thread is blocked on some internal breakpoint, and we | |
5134 | simply need to step over that breakpoint to get it going | |
5135 | again, do that first. */ | |
5136 | ||
5137 | /* However, if we see an event for the stepping thread, then we | |
5138 | know all other threads have been moved past their breakpoints | |
5139 | already. Let the caller check whether the step is finished, | |
5140 | etc., before deciding to move it past a breakpoint. */ | |
5141 | if (ecs->event_thread->control.step_range_end != 0) | |
5142 | return 0; | |
5143 | ||
5144 | /* Check if the current thread is blocked on an incomplete | |
5145 | step-over, interrupted by a random signal. */ | |
5146 | if (ecs->event_thread->control.trap_expected | |
5147 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 5148 | { |
99619bea PA |
5149 | if (debug_infrun) |
5150 | { | |
5151 | fprintf_unfiltered (gdb_stdlog, | |
5152 | "infrun: need to finish step-over of [%s]\n", | |
5153 | target_pid_to_str (ecs->event_thread->ptid)); | |
5154 | } | |
5155 | keep_going (ecs); | |
5156 | return 1; | |
5157 | } | |
2adfaa28 | 5158 | |
99619bea PA |
5159 | /* Check if the current thread is blocked by a single-step |
5160 | breakpoint of another thread. */ | |
5161 | if (ecs->hit_singlestep_breakpoint) | |
5162 | { | |
5163 | if (debug_infrun) | |
5164 | { | |
5165 | fprintf_unfiltered (gdb_stdlog, | |
5166 | "infrun: need to step [%s] over single-step " | |
5167 | "breakpoint\n", | |
5168 | target_pid_to_str (ecs->ptid)); | |
5169 | } | |
5170 | keep_going (ecs); | |
5171 | return 1; | |
5172 | } | |
5173 | ||
5174 | stepping_thread | |
5175 | = iterate_over_threads (currently_stepping_or_nexting_callback, | |
5176 | ecs->event_thread); | |
5177 | ||
5178 | /* Check if any other thread except the stepping thread that | |
5179 | needs to start a step-over. Do that before actually | |
5180 | proceeding with step/next/etc. */ | |
5181 | tp = find_thread_needs_step_over (stepping_thread != NULL, | |
5182 | stepping_thread); | |
5183 | if (tp != NULL) | |
5184 | { | |
5185 | if (debug_infrun) | |
c447ac0b | 5186 | { |
99619bea PA |
5187 | fprintf_unfiltered (gdb_stdlog, |
5188 | "infrun: need to step-over [%s]\n", | |
5189 | target_pid_to_str (tp->ptid)); | |
c447ac0b PA |
5190 | } |
5191 | ||
99619bea PA |
5192 | gdb_assert (!tp->control.trap_expected); |
5193 | gdb_assert (tp->control.step_range_end == 0); | |
5194 | ||
5195 | /* We no longer expect a trap in the current thread. Clear | |
5196 | the trap_expected flag before switching. This is what | |
5197 | keep_going would do as well, if we called it. */ | |
5198 | ecs->event_thread->control.trap_expected = 0; | |
5199 | ||
5200 | ecs->ptid = tp->ptid; | |
5201 | ecs->event_thread = tp; | |
5202 | switch_to_thread (ecs->ptid); | |
5203 | keep_going (ecs); | |
5204 | return 1; | |
5205 | } | |
5206 | ||
5207 | tp = stepping_thread; | |
5208 | if (tp != NULL) | |
5209 | { | |
5210 | struct frame_info *frame; | |
5211 | struct gdbarch *gdbarch; | |
5212 | ||
c447ac0b PA |
5213 | /* If the stepping thread exited, then don't try to switch |
5214 | back and resume it, which could fail in several different | |
5215 | ways depending on the target. Instead, just keep going. | |
5216 | ||
5217 | We can find a stepping dead thread in the thread list in | |
5218 | two cases: | |
5219 | ||
5220 | - The target supports thread exit events, and when the | |
5221 | target tries to delete the thread from the thread list, | |
5222 | inferior_ptid pointed at the exiting thread. In such | |
5223 | case, calling delete_thread does not really remove the | |
5224 | thread from the list; instead, the thread is left listed, | |
5225 | with 'exited' state. | |
5226 | ||
5227 | - The target's debug interface does not support thread | |
5228 | exit events, and so we have no idea whatsoever if the | |
5229 | previously stepping thread is still alive. For that | |
5230 | reason, we need to synchronously query the target | |
5231 | now. */ | |
5232 | if (is_exited (tp->ptid) | |
5233 | || !target_thread_alive (tp->ptid)) | |
5234 | { | |
5235 | if (debug_infrun) | |
5236 | fprintf_unfiltered (gdb_stdlog, | |
5237 | "infrun: not switching back to " | |
5238 | "stepped thread, it has vanished\n"); | |
5239 | ||
5240 | delete_thread (tp->ptid); | |
5241 | keep_going (ecs); | |
5242 | return 1; | |
5243 | } | |
5244 | ||
5245 | /* Otherwise, we no longer expect a trap in the current thread. | |
5246 | Clear the trap_expected flag before switching back -- this is | |
5247 | what keep_going would do as well, if we called it. */ | |
5248 | ecs->event_thread->control.trap_expected = 0; | |
5249 | ||
5250 | if (debug_infrun) | |
5251 | fprintf_unfiltered (gdb_stdlog, | |
5252 | "infrun: switching back to stepped thread\n"); | |
5253 | ||
5254 | ecs->event_thread = tp; | |
5255 | ecs->ptid = tp->ptid; | |
5256 | context_switch (ecs->ptid); | |
2adfaa28 PA |
5257 | |
5258 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
5259 | frame = get_current_frame (); | |
5260 | gdbarch = get_frame_arch (frame); | |
5261 | ||
5262 | /* If the PC of the thread we were trying to single-step has | |
99619bea PA |
5263 | changed, then that thread has trapped or been signaled, |
5264 | but the event has not been reported to GDB yet. Re-poll | |
5265 | the target looking for this particular thread's event | |
5266 | (i.e. temporarily enable schedlock) by: | |
2adfaa28 PA |
5267 | |
5268 | - setting a break at the current PC | |
5269 | - resuming that particular thread, only (by setting | |
5270 | trap expected) | |
5271 | ||
5272 | This prevents us continuously moving the single-step | |
5273 | breakpoint forward, one instruction at a time, | |
5274 | overstepping. */ | |
5275 | ||
5276 | if (gdbarch_software_single_step_p (gdbarch) | |
5277 | && stop_pc != tp->prev_pc) | |
5278 | { | |
5279 | if (debug_infrun) | |
5280 | fprintf_unfiltered (gdb_stdlog, | |
5281 | "infrun: expected thread advanced also\n"); | |
5282 | ||
5283 | insert_single_step_breakpoint (get_frame_arch (frame), | |
5284 | get_frame_address_space (frame), | |
5285 | stop_pc); | |
5286 | singlestep_breakpoints_inserted_p = 1; | |
5287 | ecs->event_thread->control.trap_expected = 1; | |
5288 | singlestep_ptid = inferior_ptid; | |
5289 | singlestep_pc = stop_pc; | |
5290 | ||
5291 | resume (0, GDB_SIGNAL_0); | |
5292 | prepare_to_wait (ecs); | |
5293 | } | |
5294 | else | |
5295 | { | |
5296 | if (debug_infrun) | |
5297 | fprintf_unfiltered (gdb_stdlog, | |
5298 | "infrun: expected thread still " | |
5299 | "hasn't advanced\n"); | |
5300 | keep_going (ecs); | |
5301 | } | |
5302 | ||
c447ac0b PA |
5303 | return 1; |
5304 | } | |
5305 | } | |
5306 | return 0; | |
5307 | } | |
5308 | ||
b3444185 | 5309 | /* Is thread TP in the middle of single-stepping? */ |
104c1213 | 5310 | |
a289b8f6 | 5311 | static int |
b3444185 | 5312 | currently_stepping (struct thread_info *tp) |
a7212384 | 5313 | { |
8358c15c JK |
5314 | return ((tp->control.step_range_end |
5315 | && tp->control.step_resume_breakpoint == NULL) | |
5316 | || tp->control.trap_expected | |
8358c15c | 5317 | || bpstat_should_step ()); |
a7212384 UW |
5318 | } |
5319 | ||
b3444185 PA |
5320 | /* Returns true if any thread *but* the one passed in "data" is in the |
5321 | middle of stepping or of handling a "next". */ | |
a7212384 | 5322 | |
104c1213 | 5323 | static int |
b3444185 | 5324 | currently_stepping_or_nexting_callback (struct thread_info *tp, void *data) |
104c1213 | 5325 | { |
b3444185 PA |
5326 | if (tp == data) |
5327 | return 0; | |
5328 | ||
16c381f0 | 5329 | return (tp->control.step_range_end |
ede1849f | 5330 | || tp->control.trap_expected); |
104c1213 | 5331 | } |
c906108c | 5332 | |
b2175913 MS |
5333 | /* Inferior has stepped into a subroutine call with source code that |
5334 | we should not step over. Do step to the first line of code in | |
5335 | it. */ | |
c2c6d25f JM |
5336 | |
5337 | static void | |
568d6575 UW |
5338 | handle_step_into_function (struct gdbarch *gdbarch, |
5339 | struct execution_control_state *ecs) | |
c2c6d25f JM |
5340 | { |
5341 | struct symtab *s; | |
2afb61aa | 5342 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f | 5343 | |
7e324e48 GB |
5344 | fill_in_stop_func (gdbarch, ecs); |
5345 | ||
c2c6d25f JM |
5346 | s = find_pc_symtab (stop_pc); |
5347 | if (s && s->language != language_asm) | |
568d6575 | 5348 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 | 5349 | ecs->stop_func_start); |
c2c6d25f | 5350 | |
2afb61aa | 5351 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
5352 | /* Use the step_resume_break to step until the end of the prologue, |
5353 | even if that involves jumps (as it seems to on the vax under | |
5354 | 4.2). */ | |
5355 | /* If the prologue ends in the middle of a source line, continue to | |
5356 | the end of that source line (if it is still within the function). | |
5357 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
5358 | if (stop_func_sal.end |
5359 | && stop_func_sal.pc != ecs->stop_func_start | |
5360 | && stop_func_sal.end < ecs->stop_func_end) | |
5361 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 5362 | |
2dbd5e30 KB |
5363 | /* Architectures which require breakpoint adjustment might not be able |
5364 | to place a breakpoint at the computed address. If so, the test | |
5365 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
5366 | ecs->stop_func_start to an address at which a breakpoint may be | |
5367 | legitimately placed. | |
8fb3e588 | 5368 | |
2dbd5e30 KB |
5369 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
5370 | made, GDB will enter an infinite loop when stepping through | |
5371 | optimized code consisting of VLIW instructions which contain | |
5372 | subinstructions corresponding to different source lines. On | |
5373 | FR-V, it's not permitted to place a breakpoint on any but the | |
5374 | first subinstruction of a VLIW instruction. When a breakpoint is | |
5375 | set, GDB will adjust the breakpoint address to the beginning of | |
5376 | the VLIW instruction. Thus, we need to make the corresponding | |
5377 | adjustment here when computing the stop address. */ | |
8fb3e588 | 5378 | |
568d6575 | 5379 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
5380 | { |
5381 | ecs->stop_func_start | |
568d6575 | 5382 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 5383 | ecs->stop_func_start); |
2dbd5e30 KB |
5384 | } |
5385 | ||
c2c6d25f JM |
5386 | if (ecs->stop_func_start == stop_pc) |
5387 | { | |
5388 | /* We are already there: stop now. */ | |
16c381f0 | 5389 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5390 | print_end_stepping_range_reason (); |
c2c6d25f JM |
5391 | stop_stepping (ecs); |
5392 | return; | |
5393 | } | |
5394 | else | |
5395 | { | |
5396 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 5397 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
5398 | sr_sal.pc = ecs->stop_func_start; |
5399 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 5400 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 5401 | |
c2c6d25f | 5402 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
5403 | some machines the prologue is where the new fp value is |
5404 | established. */ | |
a6d9a66e | 5405 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
5406 | |
5407 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
5408 | ecs->event_thread->control.step_range_end |
5409 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
5410 | } |
5411 | keep_going (ecs); | |
5412 | } | |
d4f3574e | 5413 | |
b2175913 MS |
5414 | /* Inferior has stepped backward into a subroutine call with source |
5415 | code that we should not step over. Do step to the beginning of the | |
5416 | last line of code in it. */ | |
5417 | ||
5418 | static void | |
568d6575 UW |
5419 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
5420 | struct execution_control_state *ecs) | |
b2175913 MS |
5421 | { |
5422 | struct symtab *s; | |
167e4384 | 5423 | struct symtab_and_line stop_func_sal; |
b2175913 | 5424 | |
7e324e48 GB |
5425 | fill_in_stop_func (gdbarch, ecs); |
5426 | ||
b2175913 MS |
5427 | s = find_pc_symtab (stop_pc); |
5428 | if (s && s->language != language_asm) | |
568d6575 | 5429 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 MS |
5430 | ecs->stop_func_start); |
5431 | ||
5432 | stop_func_sal = find_pc_line (stop_pc, 0); | |
5433 | ||
5434 | /* OK, we're just going to keep stepping here. */ | |
5435 | if (stop_func_sal.pc == stop_pc) | |
5436 | { | |
5437 | /* We're there already. Just stop stepping now. */ | |
16c381f0 | 5438 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5439 | print_end_stepping_range_reason (); |
b2175913 MS |
5440 | stop_stepping (ecs); |
5441 | } | |
5442 | else | |
5443 | { | |
5444 | /* Else just reset the step range and keep going. | |
5445 | No step-resume breakpoint, they don't work for | |
5446 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
5447 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
5448 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
5449 | keep_going (ecs); |
5450 | } | |
5451 | return; | |
5452 | } | |
5453 | ||
d3169d93 | 5454 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
5455 | This is used to both functions and to skip over code. */ |
5456 | ||
5457 | static void | |
2c03e5be PA |
5458 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
5459 | struct symtab_and_line sr_sal, | |
5460 | struct frame_id sr_id, | |
5461 | enum bptype sr_type) | |
44cbf7b5 | 5462 | { |
611c83ae PA |
5463 | /* There should never be more than one step-resume or longjmp-resume |
5464 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 5465 | step_resume_breakpoint when one is already active. */ |
8358c15c | 5466 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 5467 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
5468 | |
5469 | if (debug_infrun) | |
5470 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5471 | "infrun: inserting step-resume breakpoint at %s\n", |
5472 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 5473 | |
8358c15c | 5474 | inferior_thread ()->control.step_resume_breakpoint |
2c03e5be PA |
5475 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type); |
5476 | } | |
5477 | ||
9da8c2a0 | 5478 | void |
2c03e5be PA |
5479 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
5480 | struct symtab_and_line sr_sal, | |
5481 | struct frame_id sr_id) | |
5482 | { | |
5483 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
5484 | sr_sal, sr_id, | |
5485 | bp_step_resume); | |
44cbf7b5 | 5486 | } |
7ce450bd | 5487 | |
2c03e5be PA |
5488 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
5489 | This is used to skip a potential signal handler. | |
7ce450bd | 5490 | |
14e60db5 DJ |
5491 | This is called with the interrupted function's frame. The signal |
5492 | handler, when it returns, will resume the interrupted function at | |
5493 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
5494 | |
5495 | static void | |
2c03e5be | 5496 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
5497 | { |
5498 | struct symtab_and_line sr_sal; | |
a6d9a66e | 5499 | struct gdbarch *gdbarch; |
d303a6c7 | 5500 | |
f4c1edd8 | 5501 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
5502 | init_sal (&sr_sal); /* initialize to zeros */ |
5503 | ||
a6d9a66e | 5504 | gdbarch = get_frame_arch (return_frame); |
568d6575 | 5505 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 5506 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5507 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 5508 | |
2c03e5be PA |
5509 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
5510 | get_stack_frame_id (return_frame), | |
5511 | bp_hp_step_resume); | |
d303a6c7 AC |
5512 | } |
5513 | ||
2c03e5be PA |
5514 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
5515 | is used to skip a function after stepping into it (for "next" or if | |
5516 | the called function has no debugging information). | |
14e60db5 DJ |
5517 | |
5518 | The current function has almost always been reached by single | |
5519 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
5520 | current function, and the breakpoint will be set at the caller's | |
5521 | resume address. | |
5522 | ||
5523 | This is a separate function rather than reusing | |
2c03e5be | 5524 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 5525 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 5526 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
5527 | |
5528 | static void | |
5529 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
5530 | { | |
5531 | struct symtab_and_line sr_sal; | |
a6d9a66e | 5532 | struct gdbarch *gdbarch; |
14e60db5 DJ |
5533 | |
5534 | /* We shouldn't have gotten here if we don't know where the call site | |
5535 | is. */ | |
c7ce8faa | 5536 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 DJ |
5537 | |
5538 | init_sal (&sr_sal); /* initialize to zeros */ | |
5539 | ||
a6d9a66e | 5540 | gdbarch = frame_unwind_caller_arch (next_frame); |
c7ce8faa DJ |
5541 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
5542 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 5543 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5544 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 5545 | |
a6d9a66e | 5546 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 5547 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
5548 | } |
5549 | ||
611c83ae PA |
5550 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
5551 | new breakpoint at the target of a jmp_buf. The handling of | |
5552 | longjmp-resume uses the same mechanisms used for handling | |
5553 | "step-resume" breakpoints. */ | |
5554 | ||
5555 | static void | |
a6d9a66e | 5556 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 5557 | { |
e81a37f7 TT |
5558 | /* There should never be more than one longjmp-resume breakpoint per |
5559 | thread, so we should never be setting a new | |
611c83ae | 5560 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 5561 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
5562 | |
5563 | if (debug_infrun) | |
5564 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5565 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
5566 | paddress (gdbarch, pc)); | |
611c83ae | 5567 | |
e81a37f7 | 5568 | inferior_thread ()->control.exception_resume_breakpoint = |
a6d9a66e | 5569 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); |
611c83ae PA |
5570 | } |
5571 | ||
186c406b TT |
5572 | /* Insert an exception resume breakpoint. TP is the thread throwing |
5573 | the exception. The block B is the block of the unwinder debug hook | |
5574 | function. FRAME is the frame corresponding to the call to this | |
5575 | function. SYM is the symbol of the function argument holding the | |
5576 | target PC of the exception. */ | |
5577 | ||
5578 | static void | |
5579 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
5580 | struct block *b, | |
5581 | struct frame_info *frame, | |
5582 | struct symbol *sym) | |
5583 | { | |
bfd189b1 | 5584 | volatile struct gdb_exception e; |
186c406b TT |
5585 | |
5586 | /* We want to ignore errors here. */ | |
5587 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
5588 | { | |
5589 | struct symbol *vsym; | |
5590 | struct value *value; | |
5591 | CORE_ADDR handler; | |
5592 | struct breakpoint *bp; | |
5593 | ||
5594 | vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL); | |
5595 | value = read_var_value (vsym, frame); | |
5596 | /* If the value was optimized out, revert to the old behavior. */ | |
5597 | if (! value_optimized_out (value)) | |
5598 | { | |
5599 | handler = value_as_address (value); | |
5600 | ||
5601 | if (debug_infrun) | |
5602 | fprintf_unfiltered (gdb_stdlog, | |
5603 | "infrun: exception resume at %lx\n", | |
5604 | (unsigned long) handler); | |
5605 | ||
5606 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
5607 | handler, bp_exception_resume); | |
c70a6932 JK |
5608 | |
5609 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
5610 | frame = NULL; | |
5611 | ||
186c406b TT |
5612 | bp->thread = tp->num; |
5613 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
5614 | } | |
5615 | } | |
5616 | } | |
5617 | ||
28106bc2 SDJ |
5618 | /* A helper for check_exception_resume that sets an |
5619 | exception-breakpoint based on a SystemTap probe. */ | |
5620 | ||
5621 | static void | |
5622 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 5623 | const struct bound_probe *probe, |
28106bc2 SDJ |
5624 | struct frame_info *frame) |
5625 | { | |
5626 | struct value *arg_value; | |
5627 | CORE_ADDR handler; | |
5628 | struct breakpoint *bp; | |
5629 | ||
5630 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
5631 | if (!arg_value) | |
5632 | return; | |
5633 | ||
5634 | handler = value_as_address (arg_value); | |
5635 | ||
5636 | if (debug_infrun) | |
5637 | fprintf_unfiltered (gdb_stdlog, | |
5638 | "infrun: exception resume at %s\n", | |
6bac7473 | 5639 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
5640 | handler)); |
5641 | ||
5642 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
5643 | handler, bp_exception_resume); | |
5644 | bp->thread = tp->num; | |
5645 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
5646 | } | |
5647 | ||
186c406b TT |
5648 | /* This is called when an exception has been intercepted. Check to |
5649 | see whether the exception's destination is of interest, and if so, | |
5650 | set an exception resume breakpoint there. */ | |
5651 | ||
5652 | static void | |
5653 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 5654 | struct frame_info *frame) |
186c406b | 5655 | { |
bfd189b1 | 5656 | volatile struct gdb_exception e; |
729662a5 | 5657 | struct bound_probe probe; |
28106bc2 SDJ |
5658 | struct symbol *func; |
5659 | ||
5660 | /* First see if this exception unwinding breakpoint was set via a | |
5661 | SystemTap probe point. If so, the probe has two arguments: the | |
5662 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
5663 | set a breakpoint there. */ | |
6bac7473 | 5664 | probe = find_probe_by_pc (get_frame_pc (frame)); |
729662a5 | 5665 | if (probe.probe) |
28106bc2 | 5666 | { |
729662a5 | 5667 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
5668 | return; |
5669 | } | |
5670 | ||
5671 | func = get_frame_function (frame); | |
5672 | if (!func) | |
5673 | return; | |
186c406b TT |
5674 | |
5675 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
5676 | { | |
5677 | struct block *b; | |
8157b174 | 5678 | struct block_iterator iter; |
186c406b TT |
5679 | struct symbol *sym; |
5680 | int argno = 0; | |
5681 | ||
5682 | /* The exception breakpoint is a thread-specific breakpoint on | |
5683 | the unwinder's debug hook, declared as: | |
5684 | ||
5685 | void _Unwind_DebugHook (void *cfa, void *handler); | |
5686 | ||
5687 | The CFA argument indicates the frame to which control is | |
5688 | about to be transferred. HANDLER is the destination PC. | |
5689 | ||
5690 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
5691 | This is not extremely efficient but it avoids issues in gdb | |
5692 | with computing the DWARF CFA, and it also works even in weird | |
5693 | cases such as throwing an exception from inside a signal | |
5694 | handler. */ | |
5695 | ||
5696 | b = SYMBOL_BLOCK_VALUE (func); | |
5697 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
5698 | { | |
5699 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
5700 | continue; | |
5701 | ||
5702 | if (argno == 0) | |
5703 | ++argno; | |
5704 | else | |
5705 | { | |
5706 | insert_exception_resume_breakpoint (ecs->event_thread, | |
5707 | b, frame, sym); | |
5708 | break; | |
5709 | } | |
5710 | } | |
5711 | } | |
5712 | } | |
5713 | ||
104c1213 JM |
5714 | static void |
5715 | stop_stepping (struct execution_control_state *ecs) | |
5716 | { | |
527159b7 | 5717 | if (debug_infrun) |
8a9de0e4 | 5718 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
527159b7 | 5719 | |
31e77af2 PA |
5720 | clear_step_over_info (); |
5721 | ||
cd0fc7c3 SS |
5722 | /* Let callers know we don't want to wait for the inferior anymore. */ |
5723 | ecs->wait_some_more = 0; | |
5724 | } | |
5725 | ||
a9ba6bae PA |
5726 | /* Called when we should continue running the inferior, because the |
5727 | current event doesn't cause a user visible stop. This does the | |
5728 | resuming part; waiting for the next event is done elsewhere. */ | |
d4f3574e SS |
5729 | |
5730 | static void | |
5731 | keep_going (struct execution_control_state *ecs) | |
5732 | { | |
c4dbc9af PA |
5733 | /* Make sure normal_stop is called if we get a QUIT handled before |
5734 | reaching resume. */ | |
5735 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
5736 | ||
d4f3574e | 5737 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
5738 | ecs->event_thread->prev_pc |
5739 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 5740 | |
16c381f0 | 5741 | if (ecs->event_thread->control.trap_expected |
a493e3e2 | 5742 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) |
d4f3574e | 5743 | { |
a9ba6bae PA |
5744 | /* We haven't yet gotten our trap, and either: intercepted a |
5745 | non-signal event (e.g., a fork); or took a signal which we | |
5746 | are supposed to pass through to the inferior. Simply | |
5747 | continue. */ | |
c4dbc9af | 5748 | discard_cleanups (old_cleanups); |
2020b7ab | 5749 | resume (currently_stepping (ecs->event_thread), |
16c381f0 | 5750 | ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
5751 | } |
5752 | else | |
5753 | { | |
31e77af2 PA |
5754 | volatile struct gdb_exception e; |
5755 | struct regcache *regcache = get_current_regcache (); | |
5756 | ||
d4f3574e | 5757 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
5758 | anyway (if we got a signal, the user asked it be passed to |
5759 | the child) | |
5760 | -- or -- | |
5761 | We got our expected trap, but decided we should resume from | |
5762 | it. | |
d4f3574e | 5763 | |
a9ba6bae | 5764 | We're going to run this baby now! |
d4f3574e | 5765 | |
c36b740a VP |
5766 | Note that insert_breakpoints won't try to re-insert |
5767 | already inserted breakpoints. Therefore, we don't | |
5768 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 5769 | |
31e77af2 PA |
5770 | /* If we need to step over a breakpoint, and we're not using |
5771 | displaced stepping to do so, insert all breakpoints | |
5772 | (watchpoints, etc.) but the one we're stepping over, step one | |
5773 | instruction, and then re-insert the breakpoint when that step | |
5774 | is finished. */ | |
2adfaa28 | 5775 | if ((ecs->hit_singlestep_breakpoint |
99619bea | 5776 | || thread_still_needs_step_over (ecs->event_thread)) |
31e77af2 | 5777 | && !use_displaced_stepping (get_regcache_arch (regcache))) |
45e8c884 | 5778 | { |
31e77af2 PA |
5779 | set_step_over_info (get_regcache_aspace (regcache), |
5780 | regcache_read_pc (regcache)); | |
45e8c884 VP |
5781 | } |
5782 | else | |
31e77af2 | 5783 | clear_step_over_info (); |
abbb1732 | 5784 | |
31e77af2 PA |
5785 | /* Stop stepping if inserting breakpoints fails. */ |
5786 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
5787 | { | |
5788 | insert_breakpoints (); | |
5789 | } | |
5790 | if (e.reason < 0) | |
5791 | { | |
5792 | exception_print (gdb_stderr, e); | |
5793 | stop_stepping (ecs); | |
5794 | return; | |
d4f3574e SS |
5795 | } |
5796 | ||
16c381f0 | 5797 | ecs->event_thread->control.trap_expected |
2adfaa28 PA |
5798 | = (ecs->event_thread->stepping_over_breakpoint |
5799 | || ecs->hit_singlestep_breakpoint); | |
d4f3574e | 5800 | |
a9ba6bae PA |
5801 | /* Do not deliver GDB_SIGNAL_TRAP (except when the user |
5802 | explicitly specifies that such a signal should be delivered | |
5803 | to the target program). Typically, that would occur when a | |
5804 | user is debugging a target monitor on a simulator: the target | |
5805 | monitor sets a breakpoint; the simulator encounters this | |
5806 | breakpoint and halts the simulation handing control to GDB; | |
5807 | GDB, noting that the stop address doesn't map to any known | |
5808 | breakpoint, returns control back to the simulator; the | |
5809 | simulator then delivers the hardware equivalent of a | |
5810 | GDB_SIGNAL_TRAP to the program being debugged. */ | |
a493e3e2 | 5811 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 5812 | && !signal_program[ecs->event_thread->suspend.stop_signal]) |
a493e3e2 | 5813 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
d4f3574e | 5814 | |
c4dbc9af | 5815 | discard_cleanups (old_cleanups); |
2020b7ab | 5816 | resume (currently_stepping (ecs->event_thread), |
16c381f0 | 5817 | ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
5818 | } |
5819 | ||
488f131b | 5820 | prepare_to_wait (ecs); |
d4f3574e SS |
5821 | } |
5822 | ||
104c1213 JM |
5823 | /* This function normally comes after a resume, before |
5824 | handle_inferior_event exits. It takes care of any last bits of | |
5825 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 5826 | |
104c1213 JM |
5827 | static void |
5828 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 5829 | { |
527159b7 | 5830 | if (debug_infrun) |
8a9de0e4 | 5831 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 5832 | |
104c1213 JM |
5833 | /* This is the old end of the while loop. Let everybody know we |
5834 | want to wait for the inferior some more and get called again | |
5835 | soon. */ | |
5836 | ecs->wait_some_more = 1; | |
c906108c | 5837 | } |
11cf8741 | 5838 | |
33d62d64 JK |
5839 | /* Several print_*_reason functions to print why the inferior has stopped. |
5840 | We always print something when the inferior exits, or receives a signal. | |
5841 | The rest of the cases are dealt with later on in normal_stop and | |
5842 | print_it_typical. Ideally there should be a call to one of these | |
5843 | print_*_reason functions functions from handle_inferior_event each time | |
5844 | stop_stepping is called. */ | |
5845 | ||
5846 | /* Print why the inferior has stopped. | |
5847 | We are done with a step/next/si/ni command, print why the inferior has | |
5848 | stopped. For now print nothing. Print a message only if not in the middle | |
5849 | of doing a "step n" operation for n > 1. */ | |
5850 | ||
5851 | static void | |
5852 | print_end_stepping_range_reason (void) | |
5853 | { | |
16c381f0 JK |
5854 | if ((!inferior_thread ()->step_multi |
5855 | || !inferior_thread ()->control.stop_step) | |
79a45e25 PA |
5856 | && ui_out_is_mi_like_p (current_uiout)) |
5857 | ui_out_field_string (current_uiout, "reason", | |
33d62d64 JK |
5858 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
5859 | } | |
5860 | ||
5861 | /* The inferior was terminated by a signal, print why it stopped. */ | |
5862 | ||
11cf8741 | 5863 | static void |
2ea28649 | 5864 | print_signal_exited_reason (enum gdb_signal siggnal) |
11cf8741 | 5865 | { |
79a45e25 PA |
5866 | struct ui_out *uiout = current_uiout; |
5867 | ||
33d62d64 JK |
5868 | annotate_signalled (); |
5869 | if (ui_out_is_mi_like_p (uiout)) | |
5870 | ui_out_field_string | |
5871 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
5872 | ui_out_text (uiout, "\nProgram terminated with signal "); | |
5873 | annotate_signal_name (); | |
5874 | ui_out_field_string (uiout, "signal-name", | |
2ea28649 | 5875 | gdb_signal_to_name (siggnal)); |
33d62d64 JK |
5876 | annotate_signal_name_end (); |
5877 | ui_out_text (uiout, ", "); | |
5878 | annotate_signal_string (); | |
5879 | ui_out_field_string (uiout, "signal-meaning", | |
2ea28649 | 5880 | gdb_signal_to_string (siggnal)); |
33d62d64 JK |
5881 | annotate_signal_string_end (); |
5882 | ui_out_text (uiout, ".\n"); | |
5883 | ui_out_text (uiout, "The program no longer exists.\n"); | |
5884 | } | |
5885 | ||
5886 | /* The inferior program is finished, print why it stopped. */ | |
5887 | ||
5888 | static void | |
5889 | print_exited_reason (int exitstatus) | |
5890 | { | |
fda326dd TT |
5891 | struct inferior *inf = current_inferior (); |
5892 | const char *pidstr = target_pid_to_str (pid_to_ptid (inf->pid)); | |
79a45e25 | 5893 | struct ui_out *uiout = current_uiout; |
fda326dd | 5894 | |
33d62d64 JK |
5895 | annotate_exited (exitstatus); |
5896 | if (exitstatus) | |
5897 | { | |
5898 | if (ui_out_is_mi_like_p (uiout)) | |
5899 | ui_out_field_string (uiout, "reason", | |
5900 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
fda326dd TT |
5901 | ui_out_text (uiout, "[Inferior "); |
5902 | ui_out_text (uiout, plongest (inf->num)); | |
5903 | ui_out_text (uiout, " ("); | |
5904 | ui_out_text (uiout, pidstr); | |
5905 | ui_out_text (uiout, ") exited with code "); | |
33d62d64 | 5906 | ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) exitstatus); |
fda326dd | 5907 | ui_out_text (uiout, "]\n"); |
33d62d64 JK |
5908 | } |
5909 | else | |
11cf8741 | 5910 | { |
9dc5e2a9 | 5911 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f | 5912 | ui_out_field_string |
33d62d64 | 5913 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); |
fda326dd TT |
5914 | ui_out_text (uiout, "[Inferior "); |
5915 | ui_out_text (uiout, plongest (inf->num)); | |
5916 | ui_out_text (uiout, " ("); | |
5917 | ui_out_text (uiout, pidstr); | |
5918 | ui_out_text (uiout, ") exited normally]\n"); | |
33d62d64 JK |
5919 | } |
5920 | /* Support the --return-child-result option. */ | |
5921 | return_child_result_value = exitstatus; | |
5922 | } | |
5923 | ||
5924 | /* Signal received, print why the inferior has stopped. The signal table | |
1777feb0 | 5925 | tells us to print about it. */ |
33d62d64 JK |
5926 | |
5927 | static void | |
2ea28649 | 5928 | print_signal_received_reason (enum gdb_signal siggnal) |
33d62d64 | 5929 | { |
79a45e25 PA |
5930 | struct ui_out *uiout = current_uiout; |
5931 | ||
33d62d64 JK |
5932 | annotate_signal (); |
5933 | ||
a493e3e2 | 5934 | if (siggnal == GDB_SIGNAL_0 && !ui_out_is_mi_like_p (uiout)) |
33d62d64 JK |
5935 | { |
5936 | struct thread_info *t = inferior_thread (); | |
5937 | ||
5938 | ui_out_text (uiout, "\n["); | |
5939 | ui_out_field_string (uiout, "thread-name", | |
5940 | target_pid_to_str (t->ptid)); | |
5941 | ui_out_field_fmt (uiout, "thread-id", "] #%d", t->num); | |
5942 | ui_out_text (uiout, " stopped"); | |
5943 | } | |
5944 | else | |
5945 | { | |
5946 | ui_out_text (uiout, "\nProgram received signal "); | |
8b93c638 | 5947 | annotate_signal_name (); |
33d62d64 JK |
5948 | if (ui_out_is_mi_like_p (uiout)) |
5949 | ui_out_field_string | |
5950 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b | 5951 | ui_out_field_string (uiout, "signal-name", |
2ea28649 | 5952 | gdb_signal_to_name (siggnal)); |
8b93c638 JM |
5953 | annotate_signal_name_end (); |
5954 | ui_out_text (uiout, ", "); | |
5955 | annotate_signal_string (); | |
488f131b | 5956 | ui_out_field_string (uiout, "signal-meaning", |
2ea28649 | 5957 | gdb_signal_to_string (siggnal)); |
8b93c638 | 5958 | annotate_signal_string_end (); |
33d62d64 JK |
5959 | } |
5960 | ui_out_text (uiout, ".\n"); | |
5961 | } | |
252fbfc8 | 5962 | |
33d62d64 JK |
5963 | /* Reverse execution: target ran out of history info, print why the inferior |
5964 | has stopped. */ | |
252fbfc8 | 5965 | |
33d62d64 JK |
5966 | static void |
5967 | print_no_history_reason (void) | |
5968 | { | |
79a45e25 | 5969 | ui_out_text (current_uiout, "\nNo more reverse-execution history.\n"); |
11cf8741 | 5970 | } |
43ff13b4 | 5971 | |
0c7e1a46 PA |
5972 | /* Print current location without a level number, if we have changed |
5973 | functions or hit a breakpoint. Print source line if we have one. | |
5974 | bpstat_print contains the logic deciding in detail what to print, | |
5975 | based on the event(s) that just occurred. */ | |
5976 | ||
5977 | void | |
5978 | print_stop_event (struct target_waitstatus *ws) | |
5979 | { | |
5980 | int bpstat_ret; | |
5981 | int source_flag; | |
5982 | int do_frame_printing = 1; | |
5983 | struct thread_info *tp = inferior_thread (); | |
5984 | ||
5985 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
5986 | switch (bpstat_ret) | |
5987 | { | |
5988 | case PRINT_UNKNOWN: | |
5989 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
5990 | should) carry around the function and does (or should) use | |
5991 | that when doing a frame comparison. */ | |
5992 | if (tp->control.stop_step | |
5993 | && frame_id_eq (tp->control.step_frame_id, | |
5994 | get_frame_id (get_current_frame ())) | |
5995 | && step_start_function == find_pc_function (stop_pc)) | |
5996 | { | |
5997 | /* Finished step, just print source line. */ | |
5998 | source_flag = SRC_LINE; | |
5999 | } | |
6000 | else | |
6001 | { | |
6002 | /* Print location and source line. */ | |
6003 | source_flag = SRC_AND_LOC; | |
6004 | } | |
6005 | break; | |
6006 | case PRINT_SRC_AND_LOC: | |
6007 | /* Print location and source line. */ | |
6008 | source_flag = SRC_AND_LOC; | |
6009 | break; | |
6010 | case PRINT_SRC_ONLY: | |
6011 | source_flag = SRC_LINE; | |
6012 | break; | |
6013 | case PRINT_NOTHING: | |
6014 | /* Something bogus. */ | |
6015 | source_flag = SRC_LINE; | |
6016 | do_frame_printing = 0; | |
6017 | break; | |
6018 | default: | |
6019 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
6020 | } | |
6021 | ||
6022 | /* The behavior of this routine with respect to the source | |
6023 | flag is: | |
6024 | SRC_LINE: Print only source line | |
6025 | LOCATION: Print only location | |
6026 | SRC_AND_LOC: Print location and source line. */ | |
6027 | if (do_frame_printing) | |
6028 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
6029 | ||
6030 | /* Display the auto-display expressions. */ | |
6031 | do_displays (); | |
6032 | } | |
6033 | ||
c906108c SS |
6034 | /* Here to return control to GDB when the inferior stops for real. |
6035 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
6036 | ||
6037 | STOP_PRINT_FRAME nonzero means print the executing frame | |
6038 | (pc, function, args, file, line number and line text). | |
6039 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
6040 | attempting to insert breakpoints. */ | |
6041 | ||
6042 | void | |
96baa820 | 6043 | normal_stop (void) |
c906108c | 6044 | { |
73b65bb0 DJ |
6045 | struct target_waitstatus last; |
6046 | ptid_t last_ptid; | |
29f49a6a | 6047 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
73b65bb0 DJ |
6048 | |
6049 | get_last_target_status (&last_ptid, &last); | |
6050 | ||
29f49a6a PA |
6051 | /* If an exception is thrown from this point on, make sure to |
6052 | propagate GDB's knowledge of the executing state to the | |
6053 | frontend/user running state. A QUIT is an easy exception to see | |
6054 | here, so do this before any filtered output. */ | |
c35b1492 PA |
6055 | if (!non_stop) |
6056 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
6057 | else if (last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
6058 | && last.kind != TARGET_WAITKIND_EXITED |
6059 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c35b1492 | 6060 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); |
29f49a6a | 6061 | |
c906108c SS |
6062 | /* As with the notification of thread events, we want to delay |
6063 | notifying the user that we've switched thread context until | |
6064 | the inferior actually stops. | |
6065 | ||
73b65bb0 DJ |
6066 | There's no point in saying anything if the inferior has exited. |
6067 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
6068 | "received a signal". |
6069 | ||
6070 | Also skip saying anything in non-stop mode. In that mode, as we | |
6071 | don't want GDB to switch threads behind the user's back, to avoid | |
6072 | races where the user is typing a command to apply to thread x, | |
6073 | but GDB switches to thread y before the user finishes entering | |
6074 | the command, fetch_inferior_event installs a cleanup to restore | |
6075 | the current thread back to the thread the user had selected right | |
6076 | after this event is handled, so we're not really switching, only | |
6077 | informing of a stop. */ | |
4f8d22e3 PA |
6078 | if (!non_stop |
6079 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
6080 | && target_has_execution |
6081 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
6082 | && last.kind != TARGET_WAITKIND_EXITED |
6083 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c SS |
6084 | { |
6085 | target_terminal_ours_for_output (); | |
a3f17187 | 6086 | printf_filtered (_("[Switching to %s]\n"), |
c95310c6 | 6087 | target_pid_to_str (inferior_ptid)); |
b8fa951a | 6088 | annotate_thread_changed (); |
39f77062 | 6089 | previous_inferior_ptid = inferior_ptid; |
c906108c | 6090 | } |
c906108c | 6091 | |
0e5bf2a8 PA |
6092 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
6093 | { | |
6094 | gdb_assert (sync_execution || !target_can_async_p ()); | |
6095 | ||
6096 | target_terminal_ours_for_output (); | |
6097 | printf_filtered (_("No unwaited-for children left.\n")); | |
6098 | } | |
6099 | ||
74960c60 | 6100 | if (!breakpoints_always_inserted_mode () && target_has_execution) |
c906108c SS |
6101 | { |
6102 | if (remove_breakpoints ()) | |
6103 | { | |
6104 | target_terminal_ours_for_output (); | |
3e43a32a MS |
6105 | printf_filtered (_("Cannot remove breakpoints because " |
6106 | "program is no longer writable.\nFurther " | |
6107 | "execution is probably impossible.\n")); | |
c906108c SS |
6108 | } |
6109 | } | |
c906108c | 6110 | |
c906108c SS |
6111 | /* If an auto-display called a function and that got a signal, |
6112 | delete that auto-display to avoid an infinite recursion. */ | |
6113 | ||
6114 | if (stopped_by_random_signal) | |
6115 | disable_current_display (); | |
6116 | ||
6117 | /* Don't print a message if in the middle of doing a "step n" | |
6118 | operation for n > 1 */ | |
af679fd0 PA |
6119 | if (target_has_execution |
6120 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
6121 | && last.kind != TARGET_WAITKIND_EXITED | |
6122 | && inferior_thread ()->step_multi | |
16c381f0 | 6123 | && inferior_thread ()->control.stop_step) |
c906108c SS |
6124 | goto done; |
6125 | ||
6126 | target_terminal_ours (); | |
0f641c01 | 6127 | async_enable_stdin (); |
c906108c | 6128 | |
7abfe014 DJ |
6129 | /* Set the current source location. This will also happen if we |
6130 | display the frame below, but the current SAL will be incorrect | |
6131 | during a user hook-stop function. */ | |
d729566a | 6132 | if (has_stack_frames () && !stop_stack_dummy) |
7abfe014 DJ |
6133 | set_current_sal_from_frame (get_current_frame (), 1); |
6134 | ||
dd7e2d2b PA |
6135 | /* Let the user/frontend see the threads as stopped. */ |
6136 | do_cleanups (old_chain); | |
6137 | ||
6138 | /* Look up the hook_stop and run it (CLI internally handles problem | |
6139 | of stop_command's pre-hook not existing). */ | |
6140 | if (stop_command) | |
6141 | catch_errors (hook_stop_stub, stop_command, | |
6142 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
6143 | ||
d729566a | 6144 | if (!has_stack_frames ()) |
d51fd4c8 | 6145 | goto done; |
c906108c | 6146 | |
32400beb PA |
6147 | if (last.kind == TARGET_WAITKIND_SIGNALLED |
6148 | || last.kind == TARGET_WAITKIND_EXITED) | |
6149 | goto done; | |
6150 | ||
c906108c SS |
6151 | /* Select innermost stack frame - i.e., current frame is frame 0, |
6152 | and current location is based on that. | |
6153 | Don't do this on return from a stack dummy routine, | |
1777feb0 | 6154 | or if the program has exited. */ |
c906108c SS |
6155 | |
6156 | if (!stop_stack_dummy) | |
6157 | { | |
0f7d239c | 6158 | select_frame (get_current_frame ()); |
c906108c | 6159 | |
d01a8610 AS |
6160 | /* If --batch-silent is enabled then there's no need to print the current |
6161 | source location, and to try risks causing an error message about | |
6162 | missing source files. */ | |
6163 | if (stop_print_frame && !batch_silent) | |
0c7e1a46 | 6164 | print_stop_event (&last); |
c906108c SS |
6165 | } |
6166 | ||
6167 | /* Save the function value return registers, if we care. | |
6168 | We might be about to restore their previous contents. */ | |
9da8c2a0 PA |
6169 | if (inferior_thread ()->control.proceed_to_finish |
6170 | && execution_direction != EXEC_REVERSE) | |
d5c31457 UW |
6171 | { |
6172 | /* This should not be necessary. */ | |
6173 | if (stop_registers) | |
6174 | regcache_xfree (stop_registers); | |
6175 | ||
6176 | /* NB: The copy goes through to the target picking up the value of | |
6177 | all the registers. */ | |
6178 | stop_registers = regcache_dup (get_current_regcache ()); | |
6179 | } | |
c906108c | 6180 | |
aa7d318d | 6181 | if (stop_stack_dummy == STOP_STACK_DUMMY) |
c906108c | 6182 | { |
b89667eb DE |
6183 | /* Pop the empty frame that contains the stack dummy. |
6184 | This also restores inferior state prior to the call | |
16c381f0 | 6185 | (struct infcall_suspend_state). */ |
b89667eb | 6186 | struct frame_info *frame = get_current_frame (); |
abbb1732 | 6187 | |
b89667eb DE |
6188 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); |
6189 | frame_pop (frame); | |
3e43a32a MS |
6190 | /* frame_pop() calls reinit_frame_cache as the last thing it |
6191 | does which means there's currently no selected frame. We | |
6192 | don't need to re-establish a selected frame if the dummy call | |
6193 | returns normally, that will be done by | |
6194 | restore_infcall_control_state. However, we do have to handle | |
6195 | the case where the dummy call is returning after being | |
6196 | stopped (e.g. the dummy call previously hit a breakpoint). | |
6197 | We can't know which case we have so just always re-establish | |
6198 | a selected frame here. */ | |
0f7d239c | 6199 | select_frame (get_current_frame ()); |
c906108c SS |
6200 | } |
6201 | ||
c906108c SS |
6202 | done: |
6203 | annotate_stopped (); | |
41d2bdb4 PA |
6204 | |
6205 | /* Suppress the stop observer if we're in the middle of: | |
6206 | ||
6207 | - a step n (n > 1), as there still more steps to be done. | |
6208 | ||
6209 | - a "finish" command, as the observer will be called in | |
6210 | finish_command_continuation, so it can include the inferior | |
6211 | function's return value. | |
6212 | ||
6213 | - calling an inferior function, as we pretend we inferior didn't | |
6214 | run at all. The return value of the call is handled by the | |
6215 | expression evaluator, through call_function_by_hand. */ | |
6216 | ||
6217 | if (!target_has_execution | |
6218 | || last.kind == TARGET_WAITKIND_SIGNALLED | |
6219 | || last.kind == TARGET_WAITKIND_EXITED | |
0e5bf2a8 | 6220 | || last.kind == TARGET_WAITKIND_NO_RESUMED |
2ca0b532 PA |
6221 | || (!(inferior_thread ()->step_multi |
6222 | && inferior_thread ()->control.stop_step) | |
16c381f0 JK |
6223 | && !(inferior_thread ()->control.stop_bpstat |
6224 | && inferior_thread ()->control.proceed_to_finish) | |
6225 | && !inferior_thread ()->control.in_infcall)) | |
347bddb7 PA |
6226 | { |
6227 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
16c381f0 | 6228 | observer_notify_normal_stop (inferior_thread ()->control.stop_bpstat, |
1d33d6ba | 6229 | stop_print_frame); |
347bddb7 | 6230 | else |
1d33d6ba | 6231 | observer_notify_normal_stop (NULL, stop_print_frame); |
347bddb7 | 6232 | } |
347bddb7 | 6233 | |
48844aa6 PA |
6234 | if (target_has_execution) |
6235 | { | |
6236 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
6237 | && last.kind != TARGET_WAITKIND_EXITED) | |
6238 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
6239 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 6240 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 6241 | } |
6c95b8df PA |
6242 | |
6243 | /* Try to get rid of automatically added inferiors that are no | |
6244 | longer needed. Keeping those around slows down things linearly. | |
6245 | Note that this never removes the current inferior. */ | |
6246 | prune_inferiors (); | |
c906108c SS |
6247 | } |
6248 | ||
6249 | static int | |
96baa820 | 6250 | hook_stop_stub (void *cmd) |
c906108c | 6251 | { |
5913bcb0 | 6252 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
6253 | return (0); |
6254 | } | |
6255 | \f | |
c5aa993b | 6256 | int |
96baa820 | 6257 | signal_stop_state (int signo) |
c906108c | 6258 | { |
d6b48e9c | 6259 | return signal_stop[signo]; |
c906108c SS |
6260 | } |
6261 | ||
c5aa993b | 6262 | int |
96baa820 | 6263 | signal_print_state (int signo) |
c906108c SS |
6264 | { |
6265 | return signal_print[signo]; | |
6266 | } | |
6267 | ||
c5aa993b | 6268 | int |
96baa820 | 6269 | signal_pass_state (int signo) |
c906108c SS |
6270 | { |
6271 | return signal_program[signo]; | |
6272 | } | |
6273 | ||
2455069d UW |
6274 | static void |
6275 | signal_cache_update (int signo) | |
6276 | { | |
6277 | if (signo == -1) | |
6278 | { | |
a493e3e2 | 6279 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
6280 | signal_cache_update (signo); |
6281 | ||
6282 | return; | |
6283 | } | |
6284 | ||
6285 | signal_pass[signo] = (signal_stop[signo] == 0 | |
6286 | && signal_print[signo] == 0 | |
ab04a2af TT |
6287 | && signal_program[signo] == 1 |
6288 | && signal_catch[signo] == 0); | |
2455069d UW |
6289 | } |
6290 | ||
488f131b | 6291 | int |
7bda5e4a | 6292 | signal_stop_update (int signo, int state) |
d4f3574e SS |
6293 | { |
6294 | int ret = signal_stop[signo]; | |
abbb1732 | 6295 | |
d4f3574e | 6296 | signal_stop[signo] = state; |
2455069d | 6297 | signal_cache_update (signo); |
d4f3574e SS |
6298 | return ret; |
6299 | } | |
6300 | ||
488f131b | 6301 | int |
7bda5e4a | 6302 | signal_print_update (int signo, int state) |
d4f3574e SS |
6303 | { |
6304 | int ret = signal_print[signo]; | |
abbb1732 | 6305 | |
d4f3574e | 6306 | signal_print[signo] = state; |
2455069d | 6307 | signal_cache_update (signo); |
d4f3574e SS |
6308 | return ret; |
6309 | } | |
6310 | ||
488f131b | 6311 | int |
7bda5e4a | 6312 | signal_pass_update (int signo, int state) |
d4f3574e SS |
6313 | { |
6314 | int ret = signal_program[signo]; | |
abbb1732 | 6315 | |
d4f3574e | 6316 | signal_program[signo] = state; |
2455069d | 6317 | signal_cache_update (signo); |
d4f3574e SS |
6318 | return ret; |
6319 | } | |
6320 | ||
ab04a2af TT |
6321 | /* Update the global 'signal_catch' from INFO and notify the |
6322 | target. */ | |
6323 | ||
6324 | void | |
6325 | signal_catch_update (const unsigned int *info) | |
6326 | { | |
6327 | int i; | |
6328 | ||
6329 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
6330 | signal_catch[i] = info[i] > 0; | |
6331 | signal_cache_update (-1); | |
6332 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
6333 | } | |
6334 | ||
c906108c | 6335 | static void |
96baa820 | 6336 | sig_print_header (void) |
c906108c | 6337 | { |
3e43a32a MS |
6338 | printf_filtered (_("Signal Stop\tPrint\tPass " |
6339 | "to program\tDescription\n")); | |
c906108c SS |
6340 | } |
6341 | ||
6342 | static void | |
2ea28649 | 6343 | sig_print_info (enum gdb_signal oursig) |
c906108c | 6344 | { |
2ea28649 | 6345 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 6346 | int name_padding = 13 - strlen (name); |
96baa820 | 6347 | |
c906108c SS |
6348 | if (name_padding <= 0) |
6349 | name_padding = 0; | |
6350 | ||
6351 | printf_filtered ("%s", name); | |
488f131b | 6352 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
6353 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
6354 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
6355 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 6356 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
6357 | } |
6358 | ||
6359 | /* Specify how various signals in the inferior should be handled. */ | |
6360 | ||
6361 | static void | |
96baa820 | 6362 | handle_command (char *args, int from_tty) |
c906108c SS |
6363 | { |
6364 | char **argv; | |
6365 | int digits, wordlen; | |
6366 | int sigfirst, signum, siglast; | |
2ea28649 | 6367 | enum gdb_signal oursig; |
c906108c SS |
6368 | int allsigs; |
6369 | int nsigs; | |
6370 | unsigned char *sigs; | |
6371 | struct cleanup *old_chain; | |
6372 | ||
6373 | if (args == NULL) | |
6374 | { | |
e2e0b3e5 | 6375 | error_no_arg (_("signal to handle")); |
c906108c SS |
6376 | } |
6377 | ||
1777feb0 | 6378 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 6379 | |
a493e3e2 | 6380 | nsigs = (int) GDB_SIGNAL_LAST; |
c906108c SS |
6381 | sigs = (unsigned char *) alloca (nsigs); |
6382 | memset (sigs, 0, nsigs); | |
6383 | ||
1777feb0 | 6384 | /* Break the command line up into args. */ |
c906108c | 6385 | |
d1a41061 | 6386 | argv = gdb_buildargv (args); |
7a292a7a | 6387 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
6388 | |
6389 | /* Walk through the args, looking for signal oursigs, signal names, and | |
6390 | actions. Signal numbers and signal names may be interspersed with | |
6391 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 6392 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c SS |
6393 | |
6394 | while (*argv != NULL) | |
6395 | { | |
6396 | wordlen = strlen (*argv); | |
6397 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
6398 | {; | |
6399 | } | |
6400 | allsigs = 0; | |
6401 | sigfirst = siglast = -1; | |
6402 | ||
6403 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
6404 | { | |
6405 | /* Apply action to all signals except those used by the | |
1777feb0 | 6406 | debugger. Silently skip those. */ |
c906108c SS |
6407 | allsigs = 1; |
6408 | sigfirst = 0; | |
6409 | siglast = nsigs - 1; | |
6410 | } | |
6411 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
6412 | { | |
6413 | SET_SIGS (nsigs, sigs, signal_stop); | |
6414 | SET_SIGS (nsigs, sigs, signal_print); | |
6415 | } | |
6416 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
6417 | { | |
6418 | UNSET_SIGS (nsigs, sigs, signal_program); | |
6419 | } | |
6420 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
6421 | { | |
6422 | SET_SIGS (nsigs, sigs, signal_print); | |
6423 | } | |
6424 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
6425 | { | |
6426 | SET_SIGS (nsigs, sigs, signal_program); | |
6427 | } | |
6428 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
6429 | { | |
6430 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
6431 | } | |
6432 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
6433 | { | |
6434 | SET_SIGS (nsigs, sigs, signal_program); | |
6435 | } | |
6436 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
6437 | { | |
6438 | UNSET_SIGS (nsigs, sigs, signal_print); | |
6439 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
6440 | } | |
6441 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
6442 | { | |
6443 | UNSET_SIGS (nsigs, sigs, signal_program); | |
6444 | } | |
6445 | else if (digits > 0) | |
6446 | { | |
6447 | /* It is numeric. The numeric signal refers to our own | |
6448 | internal signal numbering from target.h, not to host/target | |
6449 | signal number. This is a feature; users really should be | |
6450 | using symbolic names anyway, and the common ones like | |
6451 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
6452 | ||
6453 | sigfirst = siglast = (int) | |
2ea28649 | 6454 | gdb_signal_from_command (atoi (*argv)); |
c906108c SS |
6455 | if ((*argv)[digits] == '-') |
6456 | { | |
6457 | siglast = (int) | |
2ea28649 | 6458 | gdb_signal_from_command (atoi ((*argv) + digits + 1)); |
c906108c SS |
6459 | } |
6460 | if (sigfirst > siglast) | |
6461 | { | |
1777feb0 | 6462 | /* Bet he didn't figure we'd think of this case... */ |
c906108c SS |
6463 | signum = sigfirst; |
6464 | sigfirst = siglast; | |
6465 | siglast = signum; | |
6466 | } | |
6467 | } | |
6468 | else | |
6469 | { | |
2ea28649 | 6470 | oursig = gdb_signal_from_name (*argv); |
a493e3e2 | 6471 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
6472 | { |
6473 | sigfirst = siglast = (int) oursig; | |
6474 | } | |
6475 | else | |
6476 | { | |
6477 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 6478 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
6479 | } |
6480 | } | |
6481 | ||
6482 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 6483 | which signals to apply actions to. */ |
c906108c SS |
6484 | |
6485 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
6486 | { | |
2ea28649 | 6487 | switch ((enum gdb_signal) signum) |
c906108c | 6488 | { |
a493e3e2 PA |
6489 | case GDB_SIGNAL_TRAP: |
6490 | case GDB_SIGNAL_INT: | |
c906108c SS |
6491 | if (!allsigs && !sigs[signum]) |
6492 | { | |
9e2f0ad4 | 6493 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 6494 | Are you sure you want to change it? "), |
2ea28649 | 6495 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
6496 | { |
6497 | sigs[signum] = 1; | |
6498 | } | |
6499 | else | |
6500 | { | |
a3f17187 | 6501 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
6502 | gdb_flush (gdb_stdout); |
6503 | } | |
6504 | } | |
6505 | break; | |
a493e3e2 PA |
6506 | case GDB_SIGNAL_0: |
6507 | case GDB_SIGNAL_DEFAULT: | |
6508 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
6509 | /* Make sure that "all" doesn't print these. */ |
6510 | break; | |
6511 | default: | |
6512 | sigs[signum] = 1; | |
6513 | break; | |
6514 | } | |
6515 | } | |
6516 | ||
6517 | argv++; | |
6518 | } | |
6519 | ||
3a031f65 PA |
6520 | for (signum = 0; signum < nsigs; signum++) |
6521 | if (sigs[signum]) | |
6522 | { | |
2455069d | 6523 | signal_cache_update (-1); |
a493e3e2 PA |
6524 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); |
6525 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); | |
c906108c | 6526 | |
3a031f65 PA |
6527 | if (from_tty) |
6528 | { | |
6529 | /* Show the results. */ | |
6530 | sig_print_header (); | |
6531 | for (; signum < nsigs; signum++) | |
6532 | if (sigs[signum]) | |
6533 | sig_print_info (signum); | |
6534 | } | |
6535 | ||
6536 | break; | |
6537 | } | |
c906108c SS |
6538 | |
6539 | do_cleanups (old_chain); | |
6540 | } | |
6541 | ||
de0bea00 MF |
6542 | /* Complete the "handle" command. */ |
6543 | ||
6544 | static VEC (char_ptr) * | |
6545 | handle_completer (struct cmd_list_element *ignore, | |
6f937416 | 6546 | const char *text, const char *word) |
de0bea00 MF |
6547 | { |
6548 | VEC (char_ptr) *vec_signals, *vec_keywords, *return_val; | |
6549 | static const char * const keywords[] = | |
6550 | { | |
6551 | "all", | |
6552 | "stop", | |
6553 | "ignore", | |
6554 | "print", | |
6555 | "pass", | |
6556 | "nostop", | |
6557 | "noignore", | |
6558 | "noprint", | |
6559 | "nopass", | |
6560 | NULL, | |
6561 | }; | |
6562 | ||
6563 | vec_signals = signal_completer (ignore, text, word); | |
6564 | vec_keywords = complete_on_enum (keywords, word, word); | |
6565 | ||
6566 | return_val = VEC_merge (char_ptr, vec_signals, vec_keywords); | |
6567 | VEC_free (char_ptr, vec_signals); | |
6568 | VEC_free (char_ptr, vec_keywords); | |
6569 | return return_val; | |
6570 | } | |
6571 | ||
c906108c | 6572 | static void |
96baa820 | 6573 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
6574 | { |
6575 | char **argv; | |
6576 | struct cleanup *old_chain; | |
6577 | ||
d1a41061 PP |
6578 | if (args == NULL) |
6579 | error_no_arg (_("xdb command")); | |
6580 | ||
1777feb0 | 6581 | /* Break the command line up into args. */ |
c906108c | 6582 | |
d1a41061 | 6583 | argv = gdb_buildargv (args); |
7a292a7a | 6584 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
6585 | if (argv[1] != (char *) NULL) |
6586 | { | |
6587 | char *argBuf; | |
6588 | int bufLen; | |
6589 | ||
6590 | bufLen = strlen (argv[0]) + 20; | |
6591 | argBuf = (char *) xmalloc (bufLen); | |
6592 | if (argBuf) | |
6593 | { | |
6594 | int validFlag = 1; | |
2ea28649 | 6595 | enum gdb_signal oursig; |
c906108c | 6596 | |
2ea28649 | 6597 | oursig = gdb_signal_from_name (argv[0]); |
c906108c SS |
6598 | memset (argBuf, 0, bufLen); |
6599 | if (strcmp (argv[1], "Q") == 0) | |
6600 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
6601 | else | |
6602 | { | |
6603 | if (strcmp (argv[1], "s") == 0) | |
6604 | { | |
6605 | if (!signal_stop[oursig]) | |
6606 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
6607 | else | |
6608 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
6609 | } | |
6610 | else if (strcmp (argv[1], "i") == 0) | |
6611 | { | |
6612 | if (!signal_program[oursig]) | |
6613 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
6614 | else | |
6615 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
6616 | } | |
6617 | else if (strcmp (argv[1], "r") == 0) | |
6618 | { | |
6619 | if (!signal_print[oursig]) | |
6620 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
6621 | else | |
6622 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
6623 | } | |
6624 | else | |
6625 | validFlag = 0; | |
6626 | } | |
6627 | if (validFlag) | |
6628 | handle_command (argBuf, from_tty); | |
6629 | else | |
a3f17187 | 6630 | printf_filtered (_("Invalid signal handling flag.\n")); |
c906108c | 6631 | if (argBuf) |
b8c9b27d | 6632 | xfree (argBuf); |
c906108c SS |
6633 | } |
6634 | } | |
6635 | do_cleanups (old_chain); | |
6636 | } | |
6637 | ||
2ea28649 PA |
6638 | enum gdb_signal |
6639 | gdb_signal_from_command (int num) | |
ed01b82c PA |
6640 | { |
6641 | if (num >= 1 && num <= 15) | |
2ea28649 | 6642 | return (enum gdb_signal) num; |
ed01b82c PA |
6643 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
6644 | Use \"info signals\" for a list of symbolic signals.")); | |
6645 | } | |
6646 | ||
c906108c SS |
6647 | /* Print current contents of the tables set by the handle command. |
6648 | It is possible we should just be printing signals actually used | |
6649 | by the current target (but for things to work right when switching | |
6650 | targets, all signals should be in the signal tables). */ | |
6651 | ||
6652 | static void | |
96baa820 | 6653 | signals_info (char *signum_exp, int from_tty) |
c906108c | 6654 | { |
2ea28649 | 6655 | enum gdb_signal oursig; |
abbb1732 | 6656 | |
c906108c SS |
6657 | sig_print_header (); |
6658 | ||
6659 | if (signum_exp) | |
6660 | { | |
6661 | /* First see if this is a symbol name. */ | |
2ea28649 | 6662 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 6663 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
6664 | { |
6665 | /* No, try numeric. */ | |
6666 | oursig = | |
2ea28649 | 6667 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
6668 | } |
6669 | sig_print_info (oursig); | |
6670 | return; | |
6671 | } | |
6672 | ||
6673 | printf_filtered ("\n"); | |
6674 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
6675 | for (oursig = GDB_SIGNAL_FIRST; |
6676 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 6677 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
6678 | { |
6679 | QUIT; | |
6680 | ||
a493e3e2 PA |
6681 | if (oursig != GDB_SIGNAL_UNKNOWN |
6682 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
6683 | sig_print_info (oursig); |
6684 | } | |
6685 | ||
3e43a32a MS |
6686 | printf_filtered (_("\nUse the \"handle\" command " |
6687 | "to change these tables.\n")); | |
c906108c | 6688 | } |
4aa995e1 | 6689 | |
c709acd1 PA |
6690 | /* Check if it makes sense to read $_siginfo from the current thread |
6691 | at this point. If not, throw an error. */ | |
6692 | ||
6693 | static void | |
6694 | validate_siginfo_access (void) | |
6695 | { | |
6696 | /* No current inferior, no siginfo. */ | |
6697 | if (ptid_equal (inferior_ptid, null_ptid)) | |
6698 | error (_("No thread selected.")); | |
6699 | ||
6700 | /* Don't try to read from a dead thread. */ | |
6701 | if (is_exited (inferior_ptid)) | |
6702 | error (_("The current thread has terminated")); | |
6703 | ||
6704 | /* ... or from a spinning thread. */ | |
6705 | if (is_running (inferior_ptid)) | |
6706 | error (_("Selected thread is running.")); | |
6707 | } | |
6708 | ||
4aa995e1 PA |
6709 | /* The $_siginfo convenience variable is a bit special. We don't know |
6710 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 6711 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
6712 | also dependent on which thread you have selected. |
6713 | ||
6714 | 1. making $_siginfo be an internalvar that creates a new value on | |
6715 | access. | |
6716 | ||
6717 | 2. making the value of $_siginfo be an lval_computed value. */ | |
6718 | ||
6719 | /* This function implements the lval_computed support for reading a | |
6720 | $_siginfo value. */ | |
6721 | ||
6722 | static void | |
6723 | siginfo_value_read (struct value *v) | |
6724 | { | |
6725 | LONGEST transferred; | |
6726 | ||
c709acd1 PA |
6727 | validate_siginfo_access (); |
6728 | ||
4aa995e1 PA |
6729 | transferred = |
6730 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
6731 | NULL, | |
6732 | value_contents_all_raw (v), | |
6733 | value_offset (v), | |
6734 | TYPE_LENGTH (value_type (v))); | |
6735 | ||
6736 | if (transferred != TYPE_LENGTH (value_type (v))) | |
6737 | error (_("Unable to read siginfo")); | |
6738 | } | |
6739 | ||
6740 | /* This function implements the lval_computed support for writing a | |
6741 | $_siginfo value. */ | |
6742 | ||
6743 | static void | |
6744 | siginfo_value_write (struct value *v, struct value *fromval) | |
6745 | { | |
6746 | LONGEST transferred; | |
6747 | ||
c709acd1 PA |
6748 | validate_siginfo_access (); |
6749 | ||
4aa995e1 PA |
6750 | transferred = target_write (¤t_target, |
6751 | TARGET_OBJECT_SIGNAL_INFO, | |
6752 | NULL, | |
6753 | value_contents_all_raw (fromval), | |
6754 | value_offset (v), | |
6755 | TYPE_LENGTH (value_type (fromval))); | |
6756 | ||
6757 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
6758 | error (_("Unable to write siginfo")); | |
6759 | } | |
6760 | ||
c8f2448a | 6761 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
6762 | { |
6763 | siginfo_value_read, | |
6764 | siginfo_value_write | |
6765 | }; | |
6766 | ||
6767 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
6768 | the current thread using architecture GDBARCH. Return a void value |
6769 | if there's no object available. */ | |
4aa995e1 | 6770 | |
2c0b251b | 6771 | static struct value * |
22d2b532 SDJ |
6772 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
6773 | void *ignore) | |
4aa995e1 | 6774 | { |
4aa995e1 | 6775 | if (target_has_stack |
78267919 UW |
6776 | && !ptid_equal (inferior_ptid, null_ptid) |
6777 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
4aa995e1 | 6778 | { |
78267919 | 6779 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 6780 | |
78267919 | 6781 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
6782 | } |
6783 | ||
78267919 | 6784 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
6785 | } |
6786 | ||
c906108c | 6787 | \f |
16c381f0 JK |
6788 | /* infcall_suspend_state contains state about the program itself like its |
6789 | registers and any signal it received when it last stopped. | |
6790 | This state must be restored regardless of how the inferior function call | |
6791 | ends (either successfully, or after it hits a breakpoint or signal) | |
6792 | if the program is to properly continue where it left off. */ | |
6793 | ||
6794 | struct infcall_suspend_state | |
7a292a7a | 6795 | { |
16c381f0 | 6796 | struct thread_suspend_state thread_suspend; |
dd80ea3c | 6797 | #if 0 /* Currently unused and empty structures are not valid C. */ |
16c381f0 | 6798 | struct inferior_suspend_state inferior_suspend; |
dd80ea3c | 6799 | #endif |
16c381f0 JK |
6800 | |
6801 | /* Other fields: */ | |
7a292a7a | 6802 | CORE_ADDR stop_pc; |
b89667eb | 6803 | struct regcache *registers; |
1736ad11 | 6804 | |
35515841 | 6805 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
1736ad11 JK |
6806 | struct gdbarch *siginfo_gdbarch; |
6807 | ||
6808 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
6809 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
6810 | content would be invalid. */ | |
6811 | gdb_byte *siginfo_data; | |
b89667eb DE |
6812 | }; |
6813 | ||
16c381f0 JK |
6814 | struct infcall_suspend_state * |
6815 | save_infcall_suspend_state (void) | |
b89667eb | 6816 | { |
16c381f0 | 6817 | struct infcall_suspend_state *inf_state; |
b89667eb | 6818 | struct thread_info *tp = inferior_thread (); |
974a734b | 6819 | #if 0 |
16c381f0 | 6820 | struct inferior *inf = current_inferior (); |
974a734b | 6821 | #endif |
1736ad11 JK |
6822 | struct regcache *regcache = get_current_regcache (); |
6823 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
6824 | gdb_byte *siginfo_data = NULL; | |
6825 | ||
6826 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
6827 | { | |
6828 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
6829 | size_t len = TYPE_LENGTH (type); | |
6830 | struct cleanup *back_to; | |
6831 | ||
6832 | siginfo_data = xmalloc (len); | |
6833 | back_to = make_cleanup (xfree, siginfo_data); | |
6834 | ||
6835 | if (target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6836 | siginfo_data, 0, len) == len) | |
6837 | discard_cleanups (back_to); | |
6838 | else | |
6839 | { | |
6840 | /* Errors ignored. */ | |
6841 | do_cleanups (back_to); | |
6842 | siginfo_data = NULL; | |
6843 | } | |
6844 | } | |
6845 | ||
41bf6aca | 6846 | inf_state = XCNEW (struct infcall_suspend_state); |
1736ad11 JK |
6847 | |
6848 | if (siginfo_data) | |
6849 | { | |
6850 | inf_state->siginfo_gdbarch = gdbarch; | |
6851 | inf_state->siginfo_data = siginfo_data; | |
6852 | } | |
b89667eb | 6853 | |
16c381f0 | 6854 | inf_state->thread_suspend = tp->suspend; |
dd80ea3c | 6855 | #if 0 /* Currently unused and empty structures are not valid C. */ |
16c381f0 | 6856 | inf_state->inferior_suspend = inf->suspend; |
dd80ea3c | 6857 | #endif |
16c381f0 | 6858 | |
35515841 | 6859 | /* run_inferior_call will not use the signal due to its `proceed' call with |
a493e3e2 PA |
6860 | GDB_SIGNAL_0 anyway. */ |
6861 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
35515841 | 6862 | |
b89667eb DE |
6863 | inf_state->stop_pc = stop_pc; |
6864 | ||
1736ad11 | 6865 | inf_state->registers = regcache_dup (regcache); |
b89667eb DE |
6866 | |
6867 | return inf_state; | |
6868 | } | |
6869 | ||
6870 | /* Restore inferior session state to INF_STATE. */ | |
6871 | ||
6872 | void | |
16c381f0 | 6873 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
6874 | { |
6875 | struct thread_info *tp = inferior_thread (); | |
974a734b | 6876 | #if 0 |
16c381f0 | 6877 | struct inferior *inf = current_inferior (); |
974a734b | 6878 | #endif |
1736ad11 JK |
6879 | struct regcache *regcache = get_current_regcache (); |
6880 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
b89667eb | 6881 | |
16c381f0 | 6882 | tp->suspend = inf_state->thread_suspend; |
dd80ea3c | 6883 | #if 0 /* Currently unused and empty structures are not valid C. */ |
16c381f0 | 6884 | inf->suspend = inf_state->inferior_suspend; |
dd80ea3c | 6885 | #endif |
16c381f0 | 6886 | |
b89667eb DE |
6887 | stop_pc = inf_state->stop_pc; |
6888 | ||
1736ad11 JK |
6889 | if (inf_state->siginfo_gdbarch == gdbarch) |
6890 | { | |
6891 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
1736ad11 JK |
6892 | |
6893 | /* Errors ignored. */ | |
6894 | target_write (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6acef6cd | 6895 | inf_state->siginfo_data, 0, TYPE_LENGTH (type)); |
1736ad11 JK |
6896 | } |
6897 | ||
b89667eb DE |
6898 | /* The inferior can be gone if the user types "print exit(0)" |
6899 | (and perhaps other times). */ | |
6900 | if (target_has_execution) | |
6901 | /* NB: The register write goes through to the target. */ | |
1736ad11 | 6902 | regcache_cpy (regcache, inf_state->registers); |
803b5f95 | 6903 | |
16c381f0 | 6904 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
6905 | } |
6906 | ||
6907 | static void | |
16c381f0 | 6908 | do_restore_infcall_suspend_state_cleanup (void *state) |
b89667eb | 6909 | { |
16c381f0 | 6910 | restore_infcall_suspend_state (state); |
b89667eb DE |
6911 | } |
6912 | ||
6913 | struct cleanup * | |
16c381f0 JK |
6914 | make_cleanup_restore_infcall_suspend_state |
6915 | (struct infcall_suspend_state *inf_state) | |
b89667eb | 6916 | { |
16c381f0 | 6917 | return make_cleanup (do_restore_infcall_suspend_state_cleanup, inf_state); |
b89667eb DE |
6918 | } |
6919 | ||
6920 | void | |
16c381f0 | 6921 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
6922 | { |
6923 | regcache_xfree (inf_state->registers); | |
803b5f95 | 6924 | xfree (inf_state->siginfo_data); |
b89667eb DE |
6925 | xfree (inf_state); |
6926 | } | |
6927 | ||
6928 | struct regcache * | |
16c381f0 | 6929 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb DE |
6930 | { |
6931 | return inf_state->registers; | |
6932 | } | |
6933 | ||
16c381f0 JK |
6934 | /* infcall_control_state contains state regarding gdb's control of the |
6935 | inferior itself like stepping control. It also contains session state like | |
6936 | the user's currently selected frame. */ | |
b89667eb | 6937 | |
16c381f0 | 6938 | struct infcall_control_state |
b89667eb | 6939 | { |
16c381f0 JK |
6940 | struct thread_control_state thread_control; |
6941 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
6942 | |
6943 | /* Other fields: */ | |
6944 | enum stop_stack_kind stop_stack_dummy; | |
6945 | int stopped_by_random_signal; | |
7a292a7a | 6946 | int stop_after_trap; |
7a292a7a | 6947 | |
b89667eb | 6948 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe | 6949 | struct frame_id selected_frame_id; |
7a292a7a SS |
6950 | }; |
6951 | ||
c906108c | 6952 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 6953 | connection. */ |
c906108c | 6954 | |
16c381f0 JK |
6955 | struct infcall_control_state * |
6956 | save_infcall_control_state (void) | |
c906108c | 6957 | { |
16c381f0 | 6958 | struct infcall_control_state *inf_status = xmalloc (sizeof (*inf_status)); |
4e1c45ea | 6959 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 6960 | struct inferior *inf = current_inferior (); |
7a292a7a | 6961 | |
16c381f0 JK |
6962 | inf_status->thread_control = tp->control; |
6963 | inf_status->inferior_control = inf->control; | |
d82142e2 | 6964 | |
8358c15c | 6965 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 6966 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 6967 | |
16c381f0 JK |
6968 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
6969 | chain. If caller's caller is walking the chain, they'll be happier if we | |
6970 | hand them back the original chain when restore_infcall_control_state is | |
6971 | called. */ | |
6972 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
6973 | |
6974 | /* Other fields: */ | |
6975 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
6976 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
6977 | inf_status->stop_after_trap = stop_after_trap; | |
c5aa993b | 6978 | |
206415a3 | 6979 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 6980 | |
7a292a7a | 6981 | return inf_status; |
c906108c SS |
6982 | } |
6983 | ||
c906108c | 6984 | static int |
96baa820 | 6985 | restore_selected_frame (void *args) |
c906108c | 6986 | { |
488f131b | 6987 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 6988 | struct frame_info *frame; |
c906108c | 6989 | |
101dcfbe | 6990 | frame = frame_find_by_id (*fid); |
c906108c | 6991 | |
aa0cd9c1 AC |
6992 | /* If inf_status->selected_frame_id is NULL, there was no previously |
6993 | selected frame. */ | |
101dcfbe | 6994 | if (frame == NULL) |
c906108c | 6995 | { |
8a3fe4f8 | 6996 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
6997 | return 0; |
6998 | } | |
6999 | ||
0f7d239c | 7000 | select_frame (frame); |
c906108c SS |
7001 | |
7002 | return (1); | |
7003 | } | |
7004 | ||
b89667eb DE |
7005 | /* Restore inferior session state to INF_STATUS. */ |
7006 | ||
c906108c | 7007 | void |
16c381f0 | 7008 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 7009 | { |
4e1c45ea | 7010 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 7011 | struct inferior *inf = current_inferior (); |
4e1c45ea | 7012 | |
8358c15c JK |
7013 | if (tp->control.step_resume_breakpoint) |
7014 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
7015 | ||
5b79abe7 TT |
7016 | if (tp->control.exception_resume_breakpoint) |
7017 | tp->control.exception_resume_breakpoint->disposition | |
7018 | = disp_del_at_next_stop; | |
7019 | ||
d82142e2 | 7020 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 7021 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 7022 | |
16c381f0 JK |
7023 | tp->control = inf_status->thread_control; |
7024 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
7025 | |
7026 | /* Other fields: */ | |
7027 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
7028 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
7029 | stop_after_trap = inf_status->stop_after_trap; | |
c906108c | 7030 | |
b89667eb | 7031 | if (target_has_stack) |
c906108c | 7032 | { |
c906108c | 7033 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
7034 | walking the stack might encounter a garbage pointer and |
7035 | error() trying to dereference it. */ | |
488f131b JB |
7036 | if (catch_errors |
7037 | (restore_selected_frame, &inf_status->selected_frame_id, | |
7038 | "Unable to restore previously selected frame:\n", | |
7039 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
7040 | /* Error in restoring the selected frame. Select the innermost |
7041 | frame. */ | |
0f7d239c | 7042 | select_frame (get_current_frame ()); |
c906108c | 7043 | } |
c906108c | 7044 | |
72cec141 | 7045 | xfree (inf_status); |
7a292a7a | 7046 | } |
c906108c | 7047 | |
74b7792f | 7048 | static void |
16c381f0 | 7049 | do_restore_infcall_control_state_cleanup (void *sts) |
74b7792f | 7050 | { |
16c381f0 | 7051 | restore_infcall_control_state (sts); |
74b7792f AC |
7052 | } |
7053 | ||
7054 | struct cleanup * | |
16c381f0 JK |
7055 | make_cleanup_restore_infcall_control_state |
7056 | (struct infcall_control_state *inf_status) | |
74b7792f | 7057 | { |
16c381f0 | 7058 | return make_cleanup (do_restore_infcall_control_state_cleanup, inf_status); |
74b7792f AC |
7059 | } |
7060 | ||
c906108c | 7061 | void |
16c381f0 | 7062 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 7063 | { |
8358c15c JK |
7064 | if (inf_status->thread_control.step_resume_breakpoint) |
7065 | inf_status->thread_control.step_resume_breakpoint->disposition | |
7066 | = disp_del_at_next_stop; | |
7067 | ||
5b79abe7 TT |
7068 | if (inf_status->thread_control.exception_resume_breakpoint) |
7069 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
7070 | = disp_del_at_next_stop; | |
7071 | ||
1777feb0 | 7072 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 7073 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 7074 | |
72cec141 | 7075 | xfree (inf_status); |
7a292a7a | 7076 | } |
b89667eb | 7077 | \f |
ca6724c1 KB |
7078 | /* restore_inferior_ptid() will be used by the cleanup machinery |
7079 | to restore the inferior_ptid value saved in a call to | |
7080 | save_inferior_ptid(). */ | |
ce696e05 KB |
7081 | |
7082 | static void | |
7083 | restore_inferior_ptid (void *arg) | |
7084 | { | |
7085 | ptid_t *saved_ptid_ptr = arg; | |
abbb1732 | 7086 | |
ce696e05 KB |
7087 | inferior_ptid = *saved_ptid_ptr; |
7088 | xfree (arg); | |
7089 | } | |
7090 | ||
7091 | /* Save the value of inferior_ptid so that it may be restored by a | |
7092 | later call to do_cleanups(). Returns the struct cleanup pointer | |
7093 | needed for later doing the cleanup. */ | |
7094 | ||
7095 | struct cleanup * | |
7096 | save_inferior_ptid (void) | |
7097 | { | |
7098 | ptid_t *saved_ptid_ptr; | |
7099 | ||
7100 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
7101 | *saved_ptid_ptr = inferior_ptid; | |
7102 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
7103 | } | |
0c557179 SDJ |
7104 | |
7105 | /* See inferior.h. */ | |
7106 | ||
7107 | void | |
7108 | clear_exit_convenience_vars (void) | |
7109 | { | |
7110 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
7111 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
7112 | } | |
c5aa993b | 7113 | \f |
488f131b | 7114 | |
b2175913 MS |
7115 | /* User interface for reverse debugging: |
7116 | Set exec-direction / show exec-direction commands | |
7117 | (returns error unless target implements to_set_exec_direction method). */ | |
7118 | ||
32231432 | 7119 | int execution_direction = EXEC_FORWARD; |
b2175913 MS |
7120 | static const char exec_forward[] = "forward"; |
7121 | static const char exec_reverse[] = "reverse"; | |
7122 | static const char *exec_direction = exec_forward; | |
40478521 | 7123 | static const char *const exec_direction_names[] = { |
b2175913 MS |
7124 | exec_forward, |
7125 | exec_reverse, | |
7126 | NULL | |
7127 | }; | |
7128 | ||
7129 | static void | |
7130 | set_exec_direction_func (char *args, int from_tty, | |
7131 | struct cmd_list_element *cmd) | |
7132 | { | |
7133 | if (target_can_execute_reverse) | |
7134 | { | |
7135 | if (!strcmp (exec_direction, exec_forward)) | |
7136 | execution_direction = EXEC_FORWARD; | |
7137 | else if (!strcmp (exec_direction, exec_reverse)) | |
7138 | execution_direction = EXEC_REVERSE; | |
7139 | } | |
8bbed405 MS |
7140 | else |
7141 | { | |
7142 | exec_direction = exec_forward; | |
7143 | error (_("Target does not support this operation.")); | |
7144 | } | |
b2175913 MS |
7145 | } |
7146 | ||
7147 | static void | |
7148 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
7149 | struct cmd_list_element *cmd, const char *value) | |
7150 | { | |
7151 | switch (execution_direction) { | |
7152 | case EXEC_FORWARD: | |
7153 | fprintf_filtered (out, _("Forward.\n")); | |
7154 | break; | |
7155 | case EXEC_REVERSE: | |
7156 | fprintf_filtered (out, _("Reverse.\n")); | |
7157 | break; | |
b2175913 | 7158 | default: |
d8b34453 PA |
7159 | internal_error (__FILE__, __LINE__, |
7160 | _("bogus execution_direction value: %d"), | |
7161 | (int) execution_direction); | |
b2175913 MS |
7162 | } |
7163 | } | |
7164 | ||
d4db2f36 PA |
7165 | static void |
7166 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
7167 | struct cmd_list_element *c, const char *value) | |
7168 | { | |
3e43a32a MS |
7169 | fprintf_filtered (file, _("Resuming the execution of threads " |
7170 | "of all processes is %s.\n"), value); | |
d4db2f36 | 7171 | } |
ad52ddc6 | 7172 | |
22d2b532 SDJ |
7173 | /* Implementation of `siginfo' variable. */ |
7174 | ||
7175 | static const struct internalvar_funcs siginfo_funcs = | |
7176 | { | |
7177 | siginfo_make_value, | |
7178 | NULL, | |
7179 | NULL | |
7180 | }; | |
7181 | ||
c906108c | 7182 | void |
96baa820 | 7183 | _initialize_infrun (void) |
c906108c | 7184 | { |
52f0bd74 AC |
7185 | int i; |
7186 | int numsigs; | |
de0bea00 | 7187 | struct cmd_list_element *c; |
c906108c | 7188 | |
1bedd215 AC |
7189 | add_info ("signals", signals_info, _("\ |
7190 | What debugger does when program gets various signals.\n\ | |
7191 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
7192 | add_info_alias ("handle", "signals", 0); |
7193 | ||
de0bea00 | 7194 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 7195 | Specify how to handle signals.\n\ |
486c7739 | 7196 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 7197 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 7198 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
7199 | will be displayed instead.\n\ |
7200 | \n\ | |
c906108c SS |
7201 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
7202 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
7203 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
7204 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 7205 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 7206 | \n\ |
1bedd215 | 7207 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
7208 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
7209 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
7210 | Print means print a message if this signal happens.\n\ | |
7211 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
7212 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
7213 | Pass and Stop may be combined.\n\ |
7214 | \n\ | |
7215 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
7216 | may be interspersed with actions, with the actions being performed for\n\ | |
7217 | all signals cumulatively specified.")); | |
de0bea00 | 7218 | set_cmd_completer (c, handle_completer); |
486c7739 | 7219 | |
c906108c SS |
7220 | if (xdb_commands) |
7221 | { | |
1bedd215 AC |
7222 | add_com ("lz", class_info, signals_info, _("\ |
7223 | What debugger does when program gets various signals.\n\ | |
7224 | Specify a signal as argument to print info on that signal only.")); | |
7225 | add_com ("z", class_run, xdb_handle_command, _("\ | |
7226 | Specify how to handle a signal.\n\ | |
c906108c SS |
7227 | Args are signals and actions to apply to those signals.\n\ |
7228 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
7229 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
7230 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
7231 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 7232 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
cce7e648 | 7233 | Recognized actions include \"s\" (toggles between stop and nostop),\n\ |
c906108c SS |
7234 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
7235 | nopass), \"Q\" (noprint)\n\ | |
7236 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
7237 | Print means print a message if this signal happens.\n\ | |
7238 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
7239 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 7240 | Pass and Stop may be combined.")); |
c906108c SS |
7241 | } |
7242 | ||
7243 | if (!dbx_commands) | |
1a966eab AC |
7244 | stop_command = add_cmd ("stop", class_obscure, |
7245 | not_just_help_class_command, _("\ | |
7246 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 7247 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 7248 | of the program stops."), &cmdlist); |
c906108c | 7249 | |
ccce17b0 | 7250 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
7251 | Set inferior debugging."), _("\ |
7252 | Show inferior debugging."), _("\ | |
7253 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
7254 | NULL, |
7255 | show_debug_infrun, | |
7256 | &setdebuglist, &showdebuglist); | |
527159b7 | 7257 | |
3e43a32a MS |
7258 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
7259 | &debug_displaced, _("\ | |
237fc4c9 PA |
7260 | Set displaced stepping debugging."), _("\ |
7261 | Show displaced stepping debugging."), _("\ | |
7262 | When non-zero, displaced stepping specific debugging is enabled."), | |
7263 | NULL, | |
7264 | show_debug_displaced, | |
7265 | &setdebuglist, &showdebuglist); | |
7266 | ||
ad52ddc6 PA |
7267 | add_setshow_boolean_cmd ("non-stop", no_class, |
7268 | &non_stop_1, _("\ | |
7269 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
7270 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
7271 | When debugging a multi-threaded program and this setting is\n\ | |
7272 | off (the default, also called all-stop mode), when one thread stops\n\ | |
7273 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
7274 | all other threads in the program while you interact with the thread of\n\ | |
7275 | interest. When you continue or step a thread, you can allow the other\n\ | |
7276 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
7277 | thread's state, all threads stop.\n\ | |
7278 | \n\ | |
7279 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
7280 | to run freely. You'll be able to step each thread independently,\n\ | |
7281 | leave it stopped or free to run as needed."), | |
7282 | set_non_stop, | |
7283 | show_non_stop, | |
7284 | &setlist, | |
7285 | &showlist); | |
7286 | ||
a493e3e2 | 7287 | numsigs = (int) GDB_SIGNAL_LAST; |
488f131b | 7288 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
7289 | signal_print = (unsigned char *) |
7290 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
7291 | signal_program = (unsigned char *) | |
7292 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
ab04a2af TT |
7293 | signal_catch = (unsigned char *) |
7294 | xmalloc (sizeof (signal_catch[0]) * numsigs); | |
2455069d UW |
7295 | signal_pass = (unsigned char *) |
7296 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
c906108c SS |
7297 | for (i = 0; i < numsigs; i++) |
7298 | { | |
7299 | signal_stop[i] = 1; | |
7300 | signal_print[i] = 1; | |
7301 | signal_program[i] = 1; | |
ab04a2af | 7302 | signal_catch[i] = 0; |
c906108c SS |
7303 | } |
7304 | ||
7305 | /* Signals caused by debugger's own actions | |
7306 | should not be given to the program afterwards. */ | |
a493e3e2 PA |
7307 | signal_program[GDB_SIGNAL_TRAP] = 0; |
7308 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
7309 | |
7310 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
7311 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
7312 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
7313 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
7314 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
7315 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
7316 | signal_print[GDB_SIGNAL_PROF] = 0; | |
7317 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
7318 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
7319 | signal_stop[GDB_SIGNAL_IO] = 0; | |
7320 | signal_print[GDB_SIGNAL_IO] = 0; | |
7321 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
7322 | signal_print[GDB_SIGNAL_POLL] = 0; | |
7323 | signal_stop[GDB_SIGNAL_URG] = 0; | |
7324 | signal_print[GDB_SIGNAL_URG] = 0; | |
7325 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
7326 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
7327 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
7328 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 7329 | |
cd0fc7c3 SS |
7330 | /* These signals are used internally by user-level thread |
7331 | implementations. (See signal(5) on Solaris.) Like the above | |
7332 | signals, a healthy program receives and handles them as part of | |
7333 | its normal operation. */ | |
a493e3e2 PA |
7334 | signal_stop[GDB_SIGNAL_LWP] = 0; |
7335 | signal_print[GDB_SIGNAL_LWP] = 0; | |
7336 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
7337 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
7338 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
7339 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
cd0fc7c3 | 7340 | |
2455069d UW |
7341 | /* Update cached state. */ |
7342 | signal_cache_update (-1); | |
7343 | ||
85c07804 AC |
7344 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
7345 | &stop_on_solib_events, _("\ | |
7346 | Set stopping for shared library events."), _("\ | |
7347 | Show stopping for shared library events."), _("\ | |
c906108c SS |
7348 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
7349 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 7350 | to the user would be loading/unloading of a new library."), |
f9e14852 | 7351 | set_stop_on_solib_events, |
920d2a44 | 7352 | show_stop_on_solib_events, |
85c07804 | 7353 | &setlist, &showlist); |
c906108c | 7354 | |
7ab04401 AC |
7355 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
7356 | follow_fork_mode_kind_names, | |
7357 | &follow_fork_mode_string, _("\ | |
7358 | Set debugger response to a program call of fork or vfork."), _("\ | |
7359 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
7360 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
7361 | parent - the original process is debugged after a fork\n\ | |
7362 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 7363 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
7364 | By default, the debugger will follow the parent process."), |
7365 | NULL, | |
920d2a44 | 7366 | show_follow_fork_mode_string, |
7ab04401 AC |
7367 | &setlist, &showlist); |
7368 | ||
6c95b8df PA |
7369 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
7370 | follow_exec_mode_names, | |
7371 | &follow_exec_mode_string, _("\ | |
7372 | Set debugger response to a program call of exec."), _("\ | |
7373 | Show debugger response to a program call of exec."), _("\ | |
7374 | An exec call replaces the program image of a process.\n\ | |
7375 | \n\ | |
7376 | follow-exec-mode can be:\n\ | |
7377 | \n\ | |
cce7e648 | 7378 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
7379 | to this new inferior. The program the process was running before\n\ |
7380 | the exec call can be restarted afterwards by restarting the original\n\ | |
7381 | inferior.\n\ | |
7382 | \n\ | |
7383 | same - the debugger keeps the process bound to the same inferior.\n\ | |
7384 | The new executable image replaces the previous executable loaded in\n\ | |
7385 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
7386 | the executable the process was running after the exec call.\n\ | |
7387 | \n\ | |
7388 | By default, the debugger will use the same inferior."), | |
7389 | NULL, | |
7390 | show_follow_exec_mode_string, | |
7391 | &setlist, &showlist); | |
7392 | ||
7ab04401 AC |
7393 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
7394 | scheduler_enums, &scheduler_mode, _("\ | |
7395 | Set mode for locking scheduler during execution."), _("\ | |
7396 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
7397 | off == no locking (threads may preempt at any time)\n\ |
7398 | on == full locking (no thread except the current thread may run)\n\ | |
7399 | step == scheduler locked during every single-step operation.\n\ | |
7400 | In this mode, no other thread may run during a step command.\n\ | |
7ab04401 AC |
7401 | Other threads may run while stepping over a function call ('next')."), |
7402 | set_schedlock_func, /* traps on target vector */ | |
920d2a44 | 7403 | show_scheduler_mode, |
7ab04401 | 7404 | &setlist, &showlist); |
5fbbeb29 | 7405 | |
d4db2f36 PA |
7406 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
7407 | Set mode for resuming threads of all processes."), _("\ | |
7408 | Show mode for resuming threads of all processes."), _("\ | |
7409 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
7410 | threads of all processes. When off (which is the default), execution\n\ | |
7411 | commands only resume the threads of the current process. The set of\n\ | |
7412 | threads that are resumed is further refined by the scheduler-locking\n\ | |
7413 | mode (see help set scheduler-locking)."), | |
7414 | NULL, | |
7415 | show_schedule_multiple, | |
7416 | &setlist, &showlist); | |
7417 | ||
5bf193a2 AC |
7418 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
7419 | Set mode of the step operation."), _("\ | |
7420 | Show mode of the step operation."), _("\ | |
7421 | When set, doing a step over a function without debug line information\n\ | |
7422 | will stop at the first instruction of that function. Otherwise, the\n\ | |
7423 | function is skipped and the step command stops at a different source line."), | |
7424 | NULL, | |
920d2a44 | 7425 | show_step_stop_if_no_debug, |
5bf193a2 | 7426 | &setlist, &showlist); |
ca6724c1 | 7427 | |
72d0e2c5 YQ |
7428 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
7429 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
7430 | Set debugger's willingness to use displaced stepping."), _("\ |
7431 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
7432 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
7433 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
7434 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
7435 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
7436 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
7437 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
7438 | NULL, |
7439 | show_can_use_displaced_stepping, | |
7440 | &setlist, &showlist); | |
237fc4c9 | 7441 | |
b2175913 MS |
7442 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
7443 | &exec_direction, _("Set direction of execution.\n\ | |
7444 | Options are 'forward' or 'reverse'."), | |
7445 | _("Show direction of execution (forward/reverse)."), | |
7446 | _("Tells gdb whether to execute forward or backward."), | |
7447 | set_exec_direction_func, show_exec_direction_func, | |
7448 | &setlist, &showlist); | |
7449 | ||
6c95b8df PA |
7450 | /* Set/show detach-on-fork: user-settable mode. */ |
7451 | ||
7452 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
7453 | Set whether gdb will detach the child of a fork."), _("\ | |
7454 | Show whether gdb will detach the child of a fork."), _("\ | |
7455 | Tells gdb whether to detach the child of a fork."), | |
7456 | NULL, NULL, &setlist, &showlist); | |
7457 | ||
03583c20 UW |
7458 | /* Set/show disable address space randomization mode. */ |
7459 | ||
7460 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
7461 | &disable_randomization, _("\ | |
7462 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
7463 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
7464 | When this mode is on (which is the default), randomization of the virtual\n\ | |
7465 | address space is disabled. Standalone programs run with the randomization\n\ | |
7466 | enabled by default on some platforms."), | |
7467 | &set_disable_randomization, | |
7468 | &show_disable_randomization, | |
7469 | &setlist, &showlist); | |
7470 | ||
ca6724c1 | 7471 | /* ptid initializations */ |
ca6724c1 KB |
7472 | inferior_ptid = null_ptid; |
7473 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd PA |
7474 | |
7475 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 7476 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 7477 | observer_attach_thread_exit (infrun_thread_thread_exit); |
fc1cf338 | 7478 | observer_attach_inferior_exit (infrun_inferior_exit); |
4aa995e1 PA |
7479 | |
7480 | /* Explicitly create without lookup, since that tries to create a | |
7481 | value with a void typed value, and when we get here, gdbarch | |
7482 | isn't initialized yet. At this point, we're quite sure there | |
7483 | isn't another convenience variable of the same name. */ | |
22d2b532 | 7484 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
7485 | |
7486 | add_setshow_boolean_cmd ("observer", no_class, | |
7487 | &observer_mode_1, _("\ | |
7488 | Set whether gdb controls the inferior in observer mode."), _("\ | |
7489 | Show whether gdb controls the inferior in observer mode."), _("\ | |
7490 | In observer mode, GDB can get data from the inferior, but not\n\ | |
7491 | affect its execution. Registers and memory may not be changed,\n\ | |
7492 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
7493 | or signalled."), | |
7494 | set_observer_mode, | |
7495 | show_observer_mode, | |
7496 | &setlist, | |
7497 | &showlist); | |
c906108c | 7498 | } |