Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
61baf725 | 4 | Copyright (C) 1986-2017 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" | |
45741a9c | 22 | #include "infrun.h" |
c906108c SS |
23 | #include <ctype.h> |
24 | #include "symtab.h" | |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "breakpoint.h" | |
03f2053f | 28 | #include "gdb_wait.h" |
c906108c SS |
29 | #include "gdbcore.h" |
30 | #include "gdbcmd.h" | |
210661e7 | 31 | #include "cli/cli-script.h" |
c906108c SS |
32 | #include "target.h" |
33 | #include "gdbthread.h" | |
34 | #include "annotate.h" | |
1adeb98a | 35 | #include "symfile.h" |
7a292a7a | 36 | #include "top.h" |
c906108c | 37 | #include <signal.h> |
2acceee2 | 38 | #include "inf-loop.h" |
4e052eda | 39 | #include "regcache.h" |
fd0407d6 | 40 | #include "value.h" |
06600e06 | 41 | #include "observer.h" |
f636b87d | 42 | #include "language.h" |
a77053c2 | 43 | #include "solib.h" |
f17517ea | 44 | #include "main.h" |
186c406b TT |
45 | #include "dictionary.h" |
46 | #include "block.h" | |
034dad6f | 47 | #include "mi/mi-common.h" |
4f8d22e3 | 48 | #include "event-top.h" |
96429cc8 | 49 | #include "record.h" |
d02ed0bb | 50 | #include "record-full.h" |
edb3359d | 51 | #include "inline-frame.h" |
4efc6507 | 52 | #include "jit.h" |
06cd862c | 53 | #include "tracepoint.h" |
be34f849 | 54 | #include "continuations.h" |
b4a14fd0 | 55 | #include "interps.h" |
1bfeeb0f | 56 | #include "skip.h" |
28106bc2 SDJ |
57 | #include "probe.h" |
58 | #include "objfiles.h" | |
de0bea00 | 59 | #include "completer.h" |
9107fc8d | 60 | #include "target-descriptions.h" |
f15cb84a | 61 | #include "target-dcache.h" |
d83ad864 | 62 | #include "terminal.h" |
ff862be4 | 63 | #include "solist.h" |
372316f1 | 64 | #include "event-loop.h" |
243a9253 | 65 | #include "thread-fsm.h" |
8d297bbf | 66 | #include "common/enum-flags.h" |
5ed8105e PA |
67 | #include "progspace-and-thread.h" |
68 | #include "common/gdb_optional.h" | |
c906108c SS |
69 | |
70 | /* Prototypes for local functions */ | |
71 | ||
96baa820 | 72 | static void signals_info (char *, int); |
c906108c | 73 | |
96baa820 | 74 | static void handle_command (char *, int); |
c906108c | 75 | |
2ea28649 | 76 | static void sig_print_info (enum gdb_signal); |
c906108c | 77 | |
96baa820 | 78 | static void sig_print_header (void); |
c906108c | 79 | |
74b7792f | 80 | static void resume_cleanups (void *); |
c906108c | 81 | |
96baa820 | 82 | static int hook_stop_stub (void *); |
c906108c | 83 | |
96baa820 JM |
84 | static int restore_selected_frame (void *); |
85 | ||
4ef3f3be | 86 | static int follow_fork (void); |
96baa820 | 87 | |
d83ad864 DB |
88 | static int follow_fork_inferior (int follow_child, int detach_fork); |
89 | ||
90 | static void follow_inferior_reset_breakpoints (void); | |
91 | ||
96baa820 | 92 | static void set_schedlock_func (char *args, int from_tty, |
488f131b | 93 | struct cmd_list_element *c); |
96baa820 | 94 | |
a289b8f6 JK |
95 | static int currently_stepping (struct thread_info *tp); |
96 | ||
96baa820 | 97 | void _initialize_infrun (void); |
43ff13b4 | 98 | |
e58b0e63 PA |
99 | void nullify_last_target_wait_ptid (void); |
100 | ||
2c03e5be | 101 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
102 | |
103 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
104 | ||
2484c66b UW |
105 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
106 | ||
8550d3b3 YQ |
107 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
108 | ||
372316f1 PA |
109 | /* Asynchronous signal handler registered as event loop source for |
110 | when we have pending events ready to be passed to the core. */ | |
111 | static struct async_event_handler *infrun_async_inferior_event_token; | |
112 | ||
113 | /* Stores whether infrun_async was previously enabled or disabled. | |
114 | Starts off as -1, indicating "never enabled/disabled". */ | |
115 | static int infrun_is_async = -1; | |
116 | ||
117 | /* See infrun.h. */ | |
118 | ||
119 | void | |
120 | infrun_async (int enable) | |
121 | { | |
122 | if (infrun_is_async != enable) | |
123 | { | |
124 | infrun_is_async = enable; | |
125 | ||
126 | if (debug_infrun) | |
127 | fprintf_unfiltered (gdb_stdlog, | |
128 | "infrun: infrun_async(%d)\n", | |
129 | enable); | |
130 | ||
131 | if (enable) | |
132 | mark_async_event_handler (infrun_async_inferior_event_token); | |
133 | else | |
134 | clear_async_event_handler (infrun_async_inferior_event_token); | |
135 | } | |
136 | } | |
137 | ||
0b333c5e PA |
138 | /* See infrun.h. */ |
139 | ||
140 | void | |
141 | mark_infrun_async_event_handler (void) | |
142 | { | |
143 | mark_async_event_handler (infrun_async_inferior_event_token); | |
144 | } | |
145 | ||
5fbbeb29 CF |
146 | /* When set, stop the 'step' command if we enter a function which has |
147 | no line number information. The normal behavior is that we step | |
148 | over such function. */ | |
149 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
150 | static void |
151 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
152 | struct cmd_list_element *c, const char *value) | |
153 | { | |
154 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
155 | } | |
5fbbeb29 | 156 | |
b9f437de PA |
157 | /* proceed and normal_stop use this to notify the user when the |
158 | inferior stopped in a different thread than it had been running | |
159 | in. */ | |
96baa820 | 160 | |
39f77062 | 161 | static ptid_t previous_inferior_ptid; |
7a292a7a | 162 | |
07107ca6 LM |
163 | /* If set (default for legacy reasons), when following a fork, GDB |
164 | will detach from one of the fork branches, child or parent. | |
165 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
166 | setting. */ | |
167 | ||
168 | static int detach_fork = 1; | |
6c95b8df | 169 | |
237fc4c9 PA |
170 | int debug_displaced = 0; |
171 | static void | |
172 | show_debug_displaced (struct ui_file *file, int from_tty, | |
173 | struct cmd_list_element *c, const char *value) | |
174 | { | |
175 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
176 | } | |
177 | ||
ccce17b0 | 178 | unsigned int debug_infrun = 0; |
920d2a44 AC |
179 | static void |
180 | show_debug_infrun (struct ui_file *file, int from_tty, | |
181 | struct cmd_list_element *c, const char *value) | |
182 | { | |
183 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
184 | } | |
527159b7 | 185 | |
03583c20 UW |
186 | |
187 | /* Support for disabling address space randomization. */ | |
188 | ||
189 | int disable_randomization = 1; | |
190 | ||
191 | static void | |
192 | show_disable_randomization (struct ui_file *file, int from_tty, | |
193 | struct cmd_list_element *c, const char *value) | |
194 | { | |
195 | if (target_supports_disable_randomization ()) | |
196 | fprintf_filtered (file, | |
197 | _("Disabling randomization of debuggee's " | |
198 | "virtual address space is %s.\n"), | |
199 | value); | |
200 | else | |
201 | fputs_filtered (_("Disabling randomization of debuggee's " | |
202 | "virtual address space is unsupported on\n" | |
203 | "this platform.\n"), file); | |
204 | } | |
205 | ||
206 | static void | |
207 | set_disable_randomization (char *args, int from_tty, | |
208 | struct cmd_list_element *c) | |
209 | { | |
210 | if (!target_supports_disable_randomization ()) | |
211 | error (_("Disabling randomization of debuggee's " | |
212 | "virtual address space is unsupported on\n" | |
213 | "this platform.")); | |
214 | } | |
215 | ||
d32dc48e PA |
216 | /* User interface for non-stop mode. */ |
217 | ||
218 | int non_stop = 0; | |
219 | static int non_stop_1 = 0; | |
220 | ||
221 | static void | |
222 | set_non_stop (char *args, int from_tty, | |
223 | struct cmd_list_element *c) | |
224 | { | |
225 | if (target_has_execution) | |
226 | { | |
227 | non_stop_1 = non_stop; | |
228 | error (_("Cannot change this setting while the inferior is running.")); | |
229 | } | |
230 | ||
231 | non_stop = non_stop_1; | |
232 | } | |
233 | ||
234 | static void | |
235 | show_non_stop (struct ui_file *file, int from_tty, | |
236 | struct cmd_list_element *c, const char *value) | |
237 | { | |
238 | fprintf_filtered (file, | |
239 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
240 | value); | |
241 | } | |
242 | ||
d914c394 SS |
243 | /* "Observer mode" is somewhat like a more extreme version of |
244 | non-stop, in which all GDB operations that might affect the | |
245 | target's execution have been disabled. */ | |
246 | ||
d914c394 SS |
247 | int observer_mode = 0; |
248 | static int observer_mode_1 = 0; | |
249 | ||
250 | static void | |
251 | set_observer_mode (char *args, int from_tty, | |
252 | struct cmd_list_element *c) | |
253 | { | |
d914c394 SS |
254 | if (target_has_execution) |
255 | { | |
256 | observer_mode_1 = observer_mode; | |
257 | error (_("Cannot change this setting while the inferior is running.")); | |
258 | } | |
259 | ||
260 | observer_mode = observer_mode_1; | |
261 | ||
262 | may_write_registers = !observer_mode; | |
263 | may_write_memory = !observer_mode; | |
264 | may_insert_breakpoints = !observer_mode; | |
265 | may_insert_tracepoints = !observer_mode; | |
266 | /* We can insert fast tracepoints in or out of observer mode, | |
267 | but enable them if we're going into this mode. */ | |
268 | if (observer_mode) | |
269 | may_insert_fast_tracepoints = 1; | |
270 | may_stop = !observer_mode; | |
271 | update_target_permissions (); | |
272 | ||
273 | /* Going *into* observer mode we must force non-stop, then | |
274 | going out we leave it that way. */ | |
275 | if (observer_mode) | |
276 | { | |
d914c394 SS |
277 | pagination_enabled = 0; |
278 | non_stop = non_stop_1 = 1; | |
279 | } | |
280 | ||
281 | if (from_tty) | |
282 | printf_filtered (_("Observer mode is now %s.\n"), | |
283 | (observer_mode ? "on" : "off")); | |
284 | } | |
285 | ||
286 | static void | |
287 | show_observer_mode (struct ui_file *file, int from_tty, | |
288 | struct cmd_list_element *c, const char *value) | |
289 | { | |
290 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
291 | } | |
292 | ||
293 | /* This updates the value of observer mode based on changes in | |
294 | permissions. Note that we are deliberately ignoring the values of | |
295 | may-write-registers and may-write-memory, since the user may have | |
296 | reason to enable these during a session, for instance to turn on a | |
297 | debugging-related global. */ | |
298 | ||
299 | void | |
300 | update_observer_mode (void) | |
301 | { | |
302 | int newval; | |
303 | ||
304 | newval = (!may_insert_breakpoints | |
305 | && !may_insert_tracepoints | |
306 | && may_insert_fast_tracepoints | |
307 | && !may_stop | |
308 | && non_stop); | |
309 | ||
310 | /* Let the user know if things change. */ | |
311 | if (newval != observer_mode) | |
312 | printf_filtered (_("Observer mode is now %s.\n"), | |
313 | (newval ? "on" : "off")); | |
314 | ||
315 | observer_mode = observer_mode_1 = newval; | |
316 | } | |
c2c6d25f | 317 | |
c906108c SS |
318 | /* Tables of how to react to signals; the user sets them. */ |
319 | ||
320 | static unsigned char *signal_stop; | |
321 | static unsigned char *signal_print; | |
322 | static unsigned char *signal_program; | |
323 | ||
ab04a2af TT |
324 | /* Table of signals that are registered with "catch signal". A |
325 | non-zero entry indicates that the signal is caught by some "catch | |
326 | signal" command. This has size GDB_SIGNAL_LAST, to accommodate all | |
327 | signals. */ | |
328 | static unsigned char *signal_catch; | |
329 | ||
2455069d UW |
330 | /* Table of signals that the target may silently handle. |
331 | This is automatically determined from the flags above, | |
332 | and simply cached here. */ | |
333 | static unsigned char *signal_pass; | |
334 | ||
c906108c SS |
335 | #define SET_SIGS(nsigs,sigs,flags) \ |
336 | do { \ | |
337 | int signum = (nsigs); \ | |
338 | while (signum-- > 0) \ | |
339 | if ((sigs)[signum]) \ | |
340 | (flags)[signum] = 1; \ | |
341 | } while (0) | |
342 | ||
343 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
344 | do { \ | |
345 | int signum = (nsigs); \ | |
346 | while (signum-- > 0) \ | |
347 | if ((sigs)[signum]) \ | |
348 | (flags)[signum] = 0; \ | |
349 | } while (0) | |
350 | ||
9b224c5e PA |
351 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
352 | this function is to avoid exporting `signal_program'. */ | |
353 | ||
354 | void | |
355 | update_signals_program_target (void) | |
356 | { | |
a493e3e2 | 357 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); |
9b224c5e PA |
358 | } |
359 | ||
1777feb0 | 360 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 361 | |
edb3359d | 362 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
363 | |
364 | /* Command list pointer for the "stop" placeholder. */ | |
365 | ||
366 | static struct cmd_list_element *stop_command; | |
367 | ||
c906108c SS |
368 | /* Nonzero if we want to give control to the user when we're notified |
369 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 370 | int stop_on_solib_events; |
f9e14852 GB |
371 | |
372 | /* Enable or disable optional shared library event breakpoints | |
373 | as appropriate when the above flag is changed. */ | |
374 | ||
375 | static void | |
376 | set_stop_on_solib_events (char *args, int from_tty, struct cmd_list_element *c) | |
377 | { | |
378 | update_solib_breakpoints (); | |
379 | } | |
380 | ||
920d2a44 AC |
381 | static void |
382 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
383 | struct cmd_list_element *c, const char *value) | |
384 | { | |
385 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
386 | value); | |
387 | } | |
c906108c | 388 | |
c906108c SS |
389 | /* Nonzero after stop if current stack frame should be printed. */ |
390 | ||
391 | static int stop_print_frame; | |
392 | ||
e02bc4cc | 393 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
394 | returned by target_wait()/deprecated_target_wait_hook(). This |
395 | information is returned by get_last_target_status(). */ | |
39f77062 | 396 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
397 | static struct target_waitstatus target_last_waitstatus; |
398 | ||
0d1e5fa7 PA |
399 | static void context_switch (ptid_t ptid); |
400 | ||
4e1c45ea | 401 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 402 | |
53904c9e AC |
403 | static const char follow_fork_mode_child[] = "child"; |
404 | static const char follow_fork_mode_parent[] = "parent"; | |
405 | ||
40478521 | 406 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
407 | follow_fork_mode_child, |
408 | follow_fork_mode_parent, | |
409 | NULL | |
ef346e04 | 410 | }; |
c906108c | 411 | |
53904c9e | 412 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
413 | static void |
414 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
415 | struct cmd_list_element *c, const char *value) | |
416 | { | |
3e43a32a MS |
417 | fprintf_filtered (file, |
418 | _("Debugger response to a program " | |
419 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
420 | value); |
421 | } | |
c906108c SS |
422 | \f |
423 | ||
d83ad864 DB |
424 | /* Handle changes to the inferior list based on the type of fork, |
425 | which process is being followed, and whether the other process | |
426 | should be detached. On entry inferior_ptid must be the ptid of | |
427 | the fork parent. At return inferior_ptid is the ptid of the | |
428 | followed inferior. */ | |
429 | ||
430 | static int | |
431 | follow_fork_inferior (int follow_child, int detach_fork) | |
432 | { | |
433 | int has_vforked; | |
79639e11 | 434 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
435 | |
436 | has_vforked = (inferior_thread ()->pending_follow.kind | |
437 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
438 | parent_ptid = inferior_ptid; |
439 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
440 | |
441 | if (has_vforked | |
442 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 443 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
444 | && !(follow_child || detach_fork || sched_multi)) |
445 | { | |
446 | /* The parent stays blocked inside the vfork syscall until the | |
447 | child execs or exits. If we don't let the child run, then | |
448 | the parent stays blocked. If we're telling the parent to run | |
449 | in the foreground, the user will not be able to ctrl-c to get | |
450 | back the terminal, effectively hanging the debug session. */ | |
451 | fprintf_filtered (gdb_stderr, _("\ | |
452 | Can not resume the parent process over vfork in the foreground while\n\ | |
453 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
454 | \"set schedule-multiple\".\n")); | |
455 | /* FIXME output string > 80 columns. */ | |
456 | return 1; | |
457 | } | |
458 | ||
459 | if (!follow_child) | |
460 | { | |
461 | /* Detach new forked process? */ | |
462 | if (detach_fork) | |
463 | { | |
d83ad864 DB |
464 | /* Before detaching from the child, remove all breakpoints |
465 | from it. If we forked, then this has already been taken | |
466 | care of by infrun.c. If we vforked however, any | |
467 | breakpoint inserted in the parent is visible in the | |
468 | child, even those added while stopped in a vfork | |
469 | catchpoint. This will remove the breakpoints from the | |
470 | parent also, but they'll be reinserted below. */ | |
471 | if (has_vforked) | |
472 | { | |
473 | /* Keep breakpoints list in sync. */ | |
474 | remove_breakpoints_pid (ptid_get_pid (inferior_ptid)); | |
475 | } | |
476 | ||
477 | if (info_verbose || debug_infrun) | |
478 | { | |
8dd06f7a DB |
479 | /* Ensure that we have a process ptid. */ |
480 | ptid_t process_ptid = pid_to_ptid (ptid_get_pid (child_ptid)); | |
481 | ||
6f259a23 | 482 | target_terminal_ours_for_output (); |
d83ad864 | 483 | fprintf_filtered (gdb_stdlog, |
79639e11 | 484 | _("Detaching after %s from child %s.\n"), |
6f259a23 | 485 | has_vforked ? "vfork" : "fork", |
8dd06f7a | 486 | target_pid_to_str (process_ptid)); |
d83ad864 DB |
487 | } |
488 | } | |
489 | else | |
490 | { | |
491 | struct inferior *parent_inf, *child_inf; | |
d83ad864 DB |
492 | |
493 | /* Add process to GDB's tables. */ | |
79639e11 | 494 | child_inf = add_inferior (ptid_get_pid (child_ptid)); |
d83ad864 DB |
495 | |
496 | parent_inf = current_inferior (); | |
497 | child_inf->attach_flag = parent_inf->attach_flag; | |
498 | copy_terminal_info (child_inf, parent_inf); | |
499 | child_inf->gdbarch = parent_inf->gdbarch; | |
500 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
501 | ||
5ed8105e | 502 | scoped_restore_current_pspace_and_thread restore_pspace_thread; |
d83ad864 | 503 | |
79639e11 | 504 | inferior_ptid = child_ptid; |
d83ad864 | 505 | add_thread (inferior_ptid); |
2a00d7ce | 506 | set_current_inferior (child_inf); |
d83ad864 DB |
507 | child_inf->symfile_flags = SYMFILE_NO_READ; |
508 | ||
509 | /* If this is a vfork child, then the address-space is | |
510 | shared with the parent. */ | |
511 | if (has_vforked) | |
512 | { | |
513 | child_inf->pspace = parent_inf->pspace; | |
514 | child_inf->aspace = parent_inf->aspace; | |
515 | ||
516 | /* The parent will be frozen until the child is done | |
517 | with the shared region. Keep track of the | |
518 | parent. */ | |
519 | child_inf->vfork_parent = parent_inf; | |
520 | child_inf->pending_detach = 0; | |
521 | parent_inf->vfork_child = child_inf; | |
522 | parent_inf->pending_detach = 0; | |
523 | } | |
524 | else | |
525 | { | |
526 | child_inf->aspace = new_address_space (); | |
527 | child_inf->pspace = add_program_space (child_inf->aspace); | |
528 | child_inf->removable = 1; | |
529 | set_current_program_space (child_inf->pspace); | |
530 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
531 | ||
532 | /* Let the shared library layer (e.g., solib-svr4) learn | |
533 | about this new process, relocate the cloned exec, pull | |
534 | in shared libraries, and install the solib event | |
535 | breakpoint. If a "cloned-VM" event was propagated | |
536 | better throughout the core, this wouldn't be | |
537 | required. */ | |
538 | solib_create_inferior_hook (0); | |
539 | } | |
d83ad864 DB |
540 | } |
541 | ||
542 | if (has_vforked) | |
543 | { | |
544 | struct inferior *parent_inf; | |
545 | ||
546 | parent_inf = current_inferior (); | |
547 | ||
548 | /* If we detached from the child, then we have to be careful | |
549 | to not insert breakpoints in the parent until the child | |
550 | is done with the shared memory region. However, if we're | |
551 | staying attached to the child, then we can and should | |
552 | insert breakpoints, so that we can debug it. A | |
553 | subsequent child exec or exit is enough to know when does | |
554 | the child stops using the parent's address space. */ | |
555 | parent_inf->waiting_for_vfork_done = detach_fork; | |
556 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
557 | } | |
558 | } | |
559 | else | |
560 | { | |
561 | /* Follow the child. */ | |
562 | struct inferior *parent_inf, *child_inf; | |
563 | struct program_space *parent_pspace; | |
564 | ||
565 | if (info_verbose || debug_infrun) | |
566 | { | |
6f259a23 DB |
567 | target_terminal_ours_for_output (); |
568 | fprintf_filtered (gdb_stdlog, | |
79639e11 PA |
569 | _("Attaching after %s %s to child %s.\n"), |
570 | target_pid_to_str (parent_ptid), | |
6f259a23 | 571 | has_vforked ? "vfork" : "fork", |
79639e11 | 572 | target_pid_to_str (child_ptid)); |
d83ad864 DB |
573 | } |
574 | ||
575 | /* Add the new inferior first, so that the target_detach below | |
576 | doesn't unpush the target. */ | |
577 | ||
79639e11 | 578 | child_inf = add_inferior (ptid_get_pid (child_ptid)); |
d83ad864 DB |
579 | |
580 | parent_inf = current_inferior (); | |
581 | child_inf->attach_flag = parent_inf->attach_flag; | |
582 | copy_terminal_info (child_inf, parent_inf); | |
583 | child_inf->gdbarch = parent_inf->gdbarch; | |
584 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
585 | ||
586 | parent_pspace = parent_inf->pspace; | |
587 | ||
588 | /* If we're vforking, we want to hold on to the parent until the | |
589 | child exits or execs. At child exec or exit time we can | |
590 | remove the old breakpoints from the parent and detach or | |
591 | resume debugging it. Otherwise, detach the parent now; we'll | |
592 | want to reuse it's program/address spaces, but we can't set | |
593 | them to the child before removing breakpoints from the | |
594 | parent, otherwise, the breakpoints module could decide to | |
595 | remove breakpoints from the wrong process (since they'd be | |
596 | assigned to the same address space). */ | |
597 | ||
598 | if (has_vforked) | |
599 | { | |
600 | gdb_assert (child_inf->vfork_parent == NULL); | |
601 | gdb_assert (parent_inf->vfork_child == NULL); | |
602 | child_inf->vfork_parent = parent_inf; | |
603 | child_inf->pending_detach = 0; | |
604 | parent_inf->vfork_child = child_inf; | |
605 | parent_inf->pending_detach = detach_fork; | |
606 | parent_inf->waiting_for_vfork_done = 0; | |
607 | } | |
608 | else if (detach_fork) | |
6f259a23 DB |
609 | { |
610 | if (info_verbose || debug_infrun) | |
611 | { | |
8dd06f7a DB |
612 | /* Ensure that we have a process ptid. */ |
613 | ptid_t process_ptid = pid_to_ptid (ptid_get_pid (child_ptid)); | |
614 | ||
6f259a23 DB |
615 | target_terminal_ours_for_output (); |
616 | fprintf_filtered (gdb_stdlog, | |
617 | _("Detaching after fork from " | |
79639e11 | 618 | "child %s.\n"), |
8dd06f7a | 619 | target_pid_to_str (process_ptid)); |
6f259a23 DB |
620 | } |
621 | ||
622 | target_detach (NULL, 0); | |
623 | } | |
d83ad864 DB |
624 | |
625 | /* Note that the detach above makes PARENT_INF dangling. */ | |
626 | ||
627 | /* Add the child thread to the appropriate lists, and switch to | |
628 | this new thread, before cloning the program space, and | |
629 | informing the solib layer about this new process. */ | |
630 | ||
79639e11 | 631 | inferior_ptid = child_ptid; |
d83ad864 | 632 | add_thread (inferior_ptid); |
2a00d7ce | 633 | set_current_inferior (child_inf); |
d83ad864 DB |
634 | |
635 | /* If this is a vfork child, then the address-space is shared | |
636 | with the parent. If we detached from the parent, then we can | |
637 | reuse the parent's program/address spaces. */ | |
638 | if (has_vforked || detach_fork) | |
639 | { | |
640 | child_inf->pspace = parent_pspace; | |
641 | child_inf->aspace = child_inf->pspace->aspace; | |
642 | } | |
643 | else | |
644 | { | |
645 | child_inf->aspace = new_address_space (); | |
646 | child_inf->pspace = add_program_space (child_inf->aspace); | |
647 | child_inf->removable = 1; | |
648 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
649 | set_current_program_space (child_inf->pspace); | |
650 | clone_program_space (child_inf->pspace, parent_pspace); | |
651 | ||
652 | /* Let the shared library layer (e.g., solib-svr4) learn | |
653 | about this new process, relocate the cloned exec, pull in | |
654 | shared libraries, and install the solib event breakpoint. | |
655 | If a "cloned-VM" event was propagated better throughout | |
656 | the core, this wouldn't be required. */ | |
657 | solib_create_inferior_hook (0); | |
658 | } | |
659 | } | |
660 | ||
661 | return target_follow_fork (follow_child, detach_fork); | |
662 | } | |
663 | ||
e58b0e63 PA |
664 | /* Tell the target to follow the fork we're stopped at. Returns true |
665 | if the inferior should be resumed; false, if the target for some | |
666 | reason decided it's best not to resume. */ | |
667 | ||
6604731b | 668 | static int |
4ef3f3be | 669 | follow_fork (void) |
c906108c | 670 | { |
ea1dd7bc | 671 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
672 | int should_resume = 1; |
673 | struct thread_info *tp; | |
674 | ||
675 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
676 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
677 | parent thread structure's run control related fields, not just these. |
678 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
679 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 680 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
681 | CORE_ADDR step_range_start = 0; |
682 | CORE_ADDR step_range_end = 0; | |
683 | struct frame_id step_frame_id = { 0 }; | |
8980e177 | 684 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
685 | |
686 | if (!non_stop) | |
687 | { | |
688 | ptid_t wait_ptid; | |
689 | struct target_waitstatus wait_status; | |
690 | ||
691 | /* Get the last target status returned by target_wait(). */ | |
692 | get_last_target_status (&wait_ptid, &wait_status); | |
693 | ||
694 | /* If not stopped at a fork event, then there's nothing else to | |
695 | do. */ | |
696 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
697 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
698 | return 1; | |
699 | ||
700 | /* Check if we switched over from WAIT_PTID, since the event was | |
701 | reported. */ | |
702 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
703 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
704 | { | |
705 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
706 | target to follow it (in either direction). We'll | |
707 | afterwards refuse to resume, and inform the user what | |
708 | happened. */ | |
709 | switch_to_thread (wait_ptid); | |
710 | should_resume = 0; | |
711 | } | |
712 | } | |
713 | ||
714 | tp = inferior_thread (); | |
715 | ||
716 | /* If there were any forks/vforks that were caught and are now to be | |
717 | followed, then do so now. */ | |
718 | switch (tp->pending_follow.kind) | |
719 | { | |
720 | case TARGET_WAITKIND_FORKED: | |
721 | case TARGET_WAITKIND_VFORKED: | |
722 | { | |
723 | ptid_t parent, child; | |
724 | ||
725 | /* If the user did a next/step, etc, over a fork call, | |
726 | preserve the stepping state in the fork child. */ | |
727 | if (follow_child && should_resume) | |
728 | { | |
8358c15c JK |
729 | step_resume_breakpoint = clone_momentary_breakpoint |
730 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
731 | step_range_start = tp->control.step_range_start; |
732 | step_range_end = tp->control.step_range_end; | |
733 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
734 | exception_resume_breakpoint |
735 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 736 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
737 | |
738 | /* For now, delete the parent's sr breakpoint, otherwise, | |
739 | parent/child sr breakpoints are considered duplicates, | |
740 | and the child version will not be installed. Remove | |
741 | this when the breakpoints module becomes aware of | |
742 | inferiors and address spaces. */ | |
743 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
744 | tp->control.step_range_start = 0; |
745 | tp->control.step_range_end = 0; | |
746 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 747 | delete_exception_resume_breakpoint (tp); |
8980e177 | 748 | tp->thread_fsm = NULL; |
e58b0e63 PA |
749 | } |
750 | ||
751 | parent = inferior_ptid; | |
752 | child = tp->pending_follow.value.related_pid; | |
753 | ||
d83ad864 DB |
754 | /* Set up inferior(s) as specified by the caller, and tell the |
755 | target to do whatever is necessary to follow either parent | |
756 | or child. */ | |
757 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
758 | { |
759 | /* Target refused to follow, or there's some other reason | |
760 | we shouldn't resume. */ | |
761 | should_resume = 0; | |
762 | } | |
763 | else | |
764 | { | |
765 | /* This pending follow fork event is now handled, one way | |
766 | or another. The previous selected thread may be gone | |
767 | from the lists by now, but if it is still around, need | |
768 | to clear the pending follow request. */ | |
e09875d4 | 769 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
770 | if (tp) |
771 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
772 | ||
773 | /* This makes sure we don't try to apply the "Switched | |
774 | over from WAIT_PID" logic above. */ | |
775 | nullify_last_target_wait_ptid (); | |
776 | ||
1777feb0 | 777 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
778 | if (follow_child) |
779 | { | |
780 | switch_to_thread (child); | |
781 | ||
782 | /* ... and preserve the stepping state, in case the | |
783 | user was stepping over the fork call. */ | |
784 | if (should_resume) | |
785 | { | |
786 | tp = inferior_thread (); | |
8358c15c JK |
787 | tp->control.step_resume_breakpoint |
788 | = step_resume_breakpoint; | |
16c381f0 JK |
789 | tp->control.step_range_start = step_range_start; |
790 | tp->control.step_range_end = step_range_end; | |
791 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
792 | tp->control.exception_resume_breakpoint |
793 | = exception_resume_breakpoint; | |
8980e177 | 794 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
795 | } |
796 | else | |
797 | { | |
798 | /* If we get here, it was because we're trying to | |
799 | resume from a fork catchpoint, but, the user | |
800 | has switched threads away from the thread that | |
801 | forked. In that case, the resume command | |
802 | issued is most likely not applicable to the | |
803 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 804 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 805 | "before following fork child.")); |
e58b0e63 PA |
806 | } |
807 | ||
808 | /* Reset breakpoints in the child as appropriate. */ | |
809 | follow_inferior_reset_breakpoints (); | |
810 | } | |
811 | else | |
812 | switch_to_thread (parent); | |
813 | } | |
814 | } | |
815 | break; | |
816 | case TARGET_WAITKIND_SPURIOUS: | |
817 | /* Nothing to follow. */ | |
818 | break; | |
819 | default: | |
820 | internal_error (__FILE__, __LINE__, | |
821 | "Unexpected pending_follow.kind %d\n", | |
822 | tp->pending_follow.kind); | |
823 | break; | |
824 | } | |
c906108c | 825 | |
e58b0e63 | 826 | return should_resume; |
c906108c SS |
827 | } |
828 | ||
d83ad864 | 829 | static void |
6604731b | 830 | follow_inferior_reset_breakpoints (void) |
c906108c | 831 | { |
4e1c45ea PA |
832 | struct thread_info *tp = inferior_thread (); |
833 | ||
6604731b DJ |
834 | /* Was there a step_resume breakpoint? (There was if the user |
835 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
836 | thread number. Cloned step_resume breakpoints are disabled on |
837 | creation, so enable it here now that it is associated with the | |
838 | correct thread. | |
6604731b DJ |
839 | |
840 | step_resumes are a form of bp that are made to be per-thread. | |
841 | Since we created the step_resume bp when the parent process | |
842 | was being debugged, and now are switching to the child process, | |
843 | from the breakpoint package's viewpoint, that's a switch of | |
844 | "threads". We must update the bp's notion of which thread | |
845 | it is for, or it'll be ignored when it triggers. */ | |
846 | ||
8358c15c | 847 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
848 | { |
849 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
850 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
851 | } | |
6604731b | 852 | |
a1aa2221 | 853 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 854 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
855 | { |
856 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
857 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
858 | } | |
186c406b | 859 | |
6604731b DJ |
860 | /* Reinsert all breakpoints in the child. The user may have set |
861 | breakpoints after catching the fork, in which case those | |
862 | were never set in the child, but only in the parent. This makes | |
863 | sure the inserted breakpoints match the breakpoint list. */ | |
864 | ||
865 | breakpoint_re_set (); | |
866 | insert_breakpoints (); | |
c906108c | 867 | } |
c906108c | 868 | |
6c95b8df PA |
869 | /* The child has exited or execed: resume threads of the parent the |
870 | user wanted to be executing. */ | |
871 | ||
872 | static int | |
873 | proceed_after_vfork_done (struct thread_info *thread, | |
874 | void *arg) | |
875 | { | |
876 | int pid = * (int *) arg; | |
877 | ||
878 | if (ptid_get_pid (thread->ptid) == pid | |
879 | && is_running (thread->ptid) | |
880 | && !is_executing (thread->ptid) | |
881 | && !thread->stop_requested | |
a493e3e2 | 882 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df PA |
883 | { |
884 | if (debug_infrun) | |
885 | fprintf_unfiltered (gdb_stdlog, | |
886 | "infrun: resuming vfork parent thread %s\n", | |
887 | target_pid_to_str (thread->ptid)); | |
888 | ||
889 | switch_to_thread (thread->ptid); | |
70509625 | 890 | clear_proceed_status (0); |
64ce06e4 | 891 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
892 | } |
893 | ||
894 | return 0; | |
895 | } | |
896 | ||
5ed8105e PA |
897 | /* Save/restore inferior_ptid, current program space and current |
898 | inferior. Only use this if the current context points at an exited | |
899 | inferior (and therefore there's no current thread to save). */ | |
900 | class scoped_restore_exited_inferior | |
901 | { | |
902 | public: | |
903 | scoped_restore_exited_inferior () | |
904 | : m_saved_ptid (&inferior_ptid) | |
905 | {} | |
906 | ||
907 | private: | |
908 | scoped_restore_tmpl<ptid_t> m_saved_ptid; | |
909 | scoped_restore_current_program_space m_pspace; | |
910 | scoped_restore_current_inferior m_inferior; | |
911 | }; | |
912 | ||
6c95b8df PA |
913 | /* Called whenever we notice an exec or exit event, to handle |
914 | detaching or resuming a vfork parent. */ | |
915 | ||
916 | static void | |
917 | handle_vfork_child_exec_or_exit (int exec) | |
918 | { | |
919 | struct inferior *inf = current_inferior (); | |
920 | ||
921 | if (inf->vfork_parent) | |
922 | { | |
923 | int resume_parent = -1; | |
924 | ||
925 | /* This exec or exit marks the end of the shared memory region | |
926 | between the parent and the child. If the user wanted to | |
927 | detach from the parent, now is the time. */ | |
928 | ||
929 | if (inf->vfork_parent->pending_detach) | |
930 | { | |
931 | struct thread_info *tp; | |
6c95b8df PA |
932 | struct program_space *pspace; |
933 | struct address_space *aspace; | |
934 | ||
1777feb0 | 935 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 936 | |
68c9da30 PA |
937 | inf->vfork_parent->pending_detach = 0; |
938 | ||
5ed8105e PA |
939 | gdb::optional<scoped_restore_exited_inferior> |
940 | maybe_restore_inferior; | |
941 | gdb::optional<scoped_restore_current_pspace_and_thread> | |
942 | maybe_restore_thread; | |
943 | ||
944 | /* If we're handling a child exit, then inferior_ptid points | |
945 | at the inferior's pid, not to a thread. */ | |
f50f4e56 | 946 | if (!exec) |
5ed8105e | 947 | maybe_restore_inferior.emplace (); |
f50f4e56 | 948 | else |
5ed8105e | 949 | maybe_restore_thread.emplace (); |
6c95b8df PA |
950 | |
951 | /* We're letting loose of the parent. */ | |
952 | tp = any_live_thread_of_process (inf->vfork_parent->pid); | |
953 | switch_to_thread (tp->ptid); | |
954 | ||
955 | /* We're about to detach from the parent, which implicitly | |
956 | removes breakpoints from its address space. There's a | |
957 | catch here: we want to reuse the spaces for the child, | |
958 | but, parent/child are still sharing the pspace at this | |
959 | point, although the exec in reality makes the kernel give | |
960 | the child a fresh set of new pages. The problem here is | |
961 | that the breakpoints module being unaware of this, would | |
962 | likely chose the child process to write to the parent | |
963 | address space. Swapping the child temporarily away from | |
964 | the spaces has the desired effect. Yes, this is "sort | |
965 | of" a hack. */ | |
966 | ||
967 | pspace = inf->pspace; | |
968 | aspace = inf->aspace; | |
969 | inf->aspace = NULL; | |
970 | inf->pspace = NULL; | |
971 | ||
972 | if (debug_infrun || info_verbose) | |
973 | { | |
6f259a23 | 974 | target_terminal_ours_for_output (); |
6c95b8df PA |
975 | |
976 | if (exec) | |
6f259a23 DB |
977 | { |
978 | fprintf_filtered (gdb_stdlog, | |
979 | _("Detaching vfork parent process " | |
980 | "%d after child exec.\n"), | |
981 | inf->vfork_parent->pid); | |
982 | } | |
6c95b8df | 983 | else |
6f259a23 DB |
984 | { |
985 | fprintf_filtered (gdb_stdlog, | |
986 | _("Detaching vfork parent process " | |
987 | "%d after child exit.\n"), | |
988 | inf->vfork_parent->pid); | |
989 | } | |
6c95b8df PA |
990 | } |
991 | ||
992 | target_detach (NULL, 0); | |
993 | ||
994 | /* Put it back. */ | |
995 | inf->pspace = pspace; | |
996 | inf->aspace = aspace; | |
6c95b8df PA |
997 | } |
998 | else if (exec) | |
999 | { | |
1000 | /* We're staying attached to the parent, so, really give the | |
1001 | child a new address space. */ | |
1002 | inf->pspace = add_program_space (maybe_new_address_space ()); | |
1003 | inf->aspace = inf->pspace->aspace; | |
1004 | inf->removable = 1; | |
1005 | set_current_program_space (inf->pspace); | |
1006 | ||
1007 | resume_parent = inf->vfork_parent->pid; | |
1008 | ||
1009 | /* Break the bonds. */ | |
1010 | inf->vfork_parent->vfork_child = NULL; | |
1011 | } | |
1012 | else | |
1013 | { | |
6c95b8df PA |
1014 | struct program_space *pspace; |
1015 | ||
1016 | /* If this is a vfork child exiting, then the pspace and | |
1017 | aspaces were shared with the parent. Since we're | |
1018 | reporting the process exit, we'll be mourning all that is | |
1019 | found in the address space, and switching to null_ptid, | |
1020 | preparing to start a new inferior. But, since we don't | |
1021 | want to clobber the parent's address/program spaces, we | |
1022 | go ahead and create a new one for this exiting | |
1023 | inferior. */ | |
1024 | ||
5ed8105e PA |
1025 | /* Switch to null_ptid while running clone_program_space, so |
1026 | that clone_program_space doesn't want to read the | |
1027 | selected frame of a dead process. */ | |
1028 | scoped_restore restore_ptid | |
1029 | = make_scoped_restore (&inferior_ptid, null_ptid); | |
6c95b8df PA |
1030 | |
1031 | /* This inferior is dead, so avoid giving the breakpoints | |
1032 | module the option to write through to it (cloning a | |
1033 | program space resets breakpoints). */ | |
1034 | inf->aspace = NULL; | |
1035 | inf->pspace = NULL; | |
1036 | pspace = add_program_space (maybe_new_address_space ()); | |
1037 | set_current_program_space (pspace); | |
1038 | inf->removable = 1; | |
7dcd53a0 | 1039 | inf->symfile_flags = SYMFILE_NO_READ; |
6c95b8df PA |
1040 | clone_program_space (pspace, inf->vfork_parent->pspace); |
1041 | inf->pspace = pspace; | |
1042 | inf->aspace = pspace->aspace; | |
1043 | ||
6c95b8df PA |
1044 | resume_parent = inf->vfork_parent->pid; |
1045 | /* Break the bonds. */ | |
1046 | inf->vfork_parent->vfork_child = NULL; | |
1047 | } | |
1048 | ||
1049 | inf->vfork_parent = NULL; | |
1050 | ||
1051 | gdb_assert (current_program_space == inf->pspace); | |
1052 | ||
1053 | if (non_stop && resume_parent != -1) | |
1054 | { | |
1055 | /* If the user wanted the parent to be running, let it go | |
1056 | free now. */ | |
5ed8105e | 1057 | scoped_restore_current_thread restore_thread; |
6c95b8df PA |
1058 | |
1059 | if (debug_infrun) | |
3e43a32a MS |
1060 | fprintf_unfiltered (gdb_stdlog, |
1061 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
1062 | resume_parent); |
1063 | ||
1064 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1065 | } |
1066 | } | |
1067 | } | |
1068 | ||
eb6c553b | 1069 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1070 | |
1071 | static const char follow_exec_mode_new[] = "new"; | |
1072 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1073 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1074 | { |
1075 | follow_exec_mode_new, | |
1076 | follow_exec_mode_same, | |
1077 | NULL, | |
1078 | }; | |
1079 | ||
1080 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1081 | static void | |
1082 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1083 | struct cmd_list_element *c, const char *value) | |
1084 | { | |
1085 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1086 | } | |
1087 | ||
ecf45d2c | 1088 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1089 | |
c906108c | 1090 | static void |
ecf45d2c | 1091 | follow_exec (ptid_t ptid, char *exec_file_target) |
c906108c | 1092 | { |
95e50b27 | 1093 | struct thread_info *th, *tmp; |
6c95b8df | 1094 | struct inferior *inf = current_inferior (); |
95e50b27 | 1095 | int pid = ptid_get_pid (ptid); |
94585166 | 1096 | ptid_t process_ptid; |
ecf45d2c SL |
1097 | char *exec_file_host; |
1098 | struct cleanup *old_chain; | |
7a292a7a | 1099 | |
c906108c SS |
1100 | /* This is an exec event that we actually wish to pay attention to. |
1101 | Refresh our symbol table to the newly exec'd program, remove any | |
1102 | momentary bp's, etc. | |
1103 | ||
1104 | If there are breakpoints, they aren't really inserted now, | |
1105 | since the exec() transformed our inferior into a fresh set | |
1106 | of instructions. | |
1107 | ||
1108 | We want to preserve symbolic breakpoints on the list, since | |
1109 | we have hopes that they can be reset after the new a.out's | |
1110 | symbol table is read. | |
1111 | ||
1112 | However, any "raw" breakpoints must be removed from the list | |
1113 | (e.g., the solib bp's), since their address is probably invalid | |
1114 | now. | |
1115 | ||
1116 | And, we DON'T want to call delete_breakpoints() here, since | |
1117 | that may write the bp's "shadow contents" (the instruction | |
1118 | value that was overwritten witha TRAP instruction). Since | |
1777feb0 | 1119 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1120 | |
1121 | mark_breakpoints_out (); | |
1122 | ||
95e50b27 PA |
1123 | /* The target reports the exec event to the main thread, even if |
1124 | some other thread does the exec, and even if the main thread was | |
1125 | stopped or already gone. We may still have non-leader threads of | |
1126 | the process on our list. E.g., on targets that don't have thread | |
1127 | exit events (like remote); or on native Linux in non-stop mode if | |
1128 | there were only two threads in the inferior and the non-leader | |
1129 | one is the one that execs (and nothing forces an update of the | |
1130 | thread list up to here). When debugging remotely, it's best to | |
1131 | avoid extra traffic, when possible, so avoid syncing the thread | |
1132 | list with the target, and instead go ahead and delete all threads | |
1133 | of the process but one that reported the event. Note this must | |
1134 | be done before calling update_breakpoints_after_exec, as | |
1135 | otherwise clearing the threads' resources would reference stale | |
1136 | thread breakpoints -- it may have been one of these threads that | |
1137 | stepped across the exec. We could just clear their stepping | |
1138 | states, but as long as we're iterating, might as well delete | |
1139 | them. Deleting them now rather than at the next user-visible | |
1140 | stop provides a nicer sequence of events for user and MI | |
1141 | notifications. */ | |
8a06aea7 | 1142 | ALL_THREADS_SAFE (th, tmp) |
95e50b27 PA |
1143 | if (ptid_get_pid (th->ptid) == pid && !ptid_equal (th->ptid, ptid)) |
1144 | delete_thread (th->ptid); | |
1145 | ||
1146 | /* We also need to clear any left over stale state for the | |
1147 | leader/event thread. E.g., if there was any step-resume | |
1148 | breakpoint or similar, it's gone now. We cannot truly | |
1149 | step-to-next statement through an exec(). */ | |
1150 | th = inferior_thread (); | |
8358c15c | 1151 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1152 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1153 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1154 | th->control.step_range_start = 0; |
1155 | th->control.step_range_end = 0; | |
c906108c | 1156 | |
95e50b27 PA |
1157 | /* The user may have had the main thread held stopped in the |
1158 | previous image (e.g., schedlock on, or non-stop). Release | |
1159 | it now. */ | |
a75724bc PA |
1160 | th->stop_requested = 0; |
1161 | ||
95e50b27 PA |
1162 | update_breakpoints_after_exec (); |
1163 | ||
1777feb0 | 1164 | /* What is this a.out's name? */ |
94585166 | 1165 | process_ptid = pid_to_ptid (pid); |
6c95b8df | 1166 | printf_unfiltered (_("%s is executing new program: %s\n"), |
94585166 | 1167 | target_pid_to_str (process_ptid), |
ecf45d2c | 1168 | exec_file_target); |
c906108c SS |
1169 | |
1170 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1171 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1172 | |
c906108c | 1173 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
1174 | |
1175 | breakpoint_init_inferior (inf_execd); | |
e85a822c | 1176 | |
ecf45d2c SL |
1177 | exec_file_host = exec_file_find (exec_file_target, NULL); |
1178 | old_chain = make_cleanup (xfree, exec_file_host); | |
ff862be4 | 1179 | |
ecf45d2c SL |
1180 | /* If we were unable to map the executable target pathname onto a host |
1181 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1182 | is confusing. Maybe it would even be better to stop at this point | |
1183 | so that the user can specify a file manually before continuing. */ | |
1184 | if (exec_file_host == NULL) | |
1185 | warning (_("Could not load symbols for executable %s.\n" | |
1186 | "Do you need \"set sysroot\"?"), | |
1187 | exec_file_target); | |
c906108c | 1188 | |
cce9b6bf PA |
1189 | /* Reset the shared library package. This ensures that we get a |
1190 | shlib event when the child reaches "_start", at which point the | |
1191 | dld will have had a chance to initialize the child. */ | |
1192 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1193 | we don't want those to be satisfied by the libraries of the | |
1194 | previous incarnation of this process. */ | |
1195 | no_shared_libraries (NULL, 0); | |
1196 | ||
6c95b8df PA |
1197 | if (follow_exec_mode_string == follow_exec_mode_new) |
1198 | { | |
6c95b8df PA |
1199 | /* The user wants to keep the old inferior and program spaces |
1200 | around. Create a new fresh one, and switch to it. */ | |
1201 | ||
17d8546e DB |
1202 | /* Do exit processing for the original inferior before adding |
1203 | the new inferior so we don't have two active inferiors with | |
1204 | the same ptid, which can confuse find_inferior_ptid. */ | |
1205 | exit_inferior_num_silent (current_inferior ()->num); | |
1206 | ||
94585166 DB |
1207 | inf = add_inferior_with_spaces (); |
1208 | inf->pid = pid; | |
ecf45d2c | 1209 | target_follow_exec (inf, exec_file_target); |
6c95b8df PA |
1210 | |
1211 | set_current_inferior (inf); | |
94585166 DB |
1212 | set_current_program_space (inf->pspace); |
1213 | add_thread (ptid); | |
6c95b8df | 1214 | } |
9107fc8d PA |
1215 | else |
1216 | { | |
1217 | /* The old description may no longer be fit for the new image. | |
1218 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1219 | old description; we'll read a new one below. No need to do | |
1220 | this on "follow-exec-mode new", as the old inferior stays | |
1221 | around (its description is later cleared/refetched on | |
1222 | restart). */ | |
1223 | target_clear_description (); | |
1224 | } | |
6c95b8df PA |
1225 | |
1226 | gdb_assert (current_program_space == inf->pspace); | |
1227 | ||
ecf45d2c SL |
1228 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1229 | because the proper displacement for a PIE (Position Independent | |
1230 | Executable) main symbol file will only be computed by | |
1231 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1232 | to insert the breakpoints with the zero displacement. */ | |
1233 | try_open_exec_file (exec_file_host, inf, SYMFILE_DEFER_BP_RESET); | |
c1e56572 | 1234 | |
ecf45d2c | 1235 | do_cleanups (old_chain); |
c906108c | 1236 | |
9107fc8d PA |
1237 | /* If the target can specify a description, read it. Must do this |
1238 | after flipping to the new executable (because the target supplied | |
1239 | description must be compatible with the executable's | |
1240 | architecture, and the old executable may e.g., be 32-bit, while | |
1241 | the new one 64-bit), and before anything involving memory or | |
1242 | registers. */ | |
1243 | target_find_description (); | |
1244 | ||
268a4a75 | 1245 | solib_create_inferior_hook (0); |
c906108c | 1246 | |
4efc6507 DE |
1247 | jit_inferior_created_hook (); |
1248 | ||
c1e56572 JK |
1249 | breakpoint_re_set (); |
1250 | ||
c906108c SS |
1251 | /* Reinsert all breakpoints. (Those which were symbolic have |
1252 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1253 | to symbol_file_command...). */ |
c906108c SS |
1254 | insert_breakpoints (); |
1255 | ||
1256 | /* The next resume of this inferior should bring it to the shlib | |
1257 | startup breakpoints. (If the user had also set bp's on | |
1258 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1259 | matically get reset there in the new process.). */ |
c906108c SS |
1260 | } |
1261 | ||
c2829269 PA |
1262 | /* The queue of threads that need to do a step-over operation to get |
1263 | past e.g., a breakpoint. What technique is used to step over the | |
1264 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1265 | same queue, to maintain rough temporal order of execution, in order | |
1266 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1267 | constantly stepping the same couple threads past their breakpoints | |
1268 | over and over, if the single-step finish fast enough. */ | |
1269 | struct thread_info *step_over_queue_head; | |
1270 | ||
6c4cfb24 PA |
1271 | /* Bit flags indicating what the thread needs to step over. */ |
1272 | ||
8d297bbf | 1273 | enum step_over_what_flag |
6c4cfb24 PA |
1274 | { |
1275 | /* Step over a breakpoint. */ | |
1276 | STEP_OVER_BREAKPOINT = 1, | |
1277 | ||
1278 | /* Step past a non-continuable watchpoint, in order to let the | |
1279 | instruction execute so we can evaluate the watchpoint | |
1280 | expression. */ | |
1281 | STEP_OVER_WATCHPOINT = 2 | |
1282 | }; | |
8d297bbf | 1283 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1284 | |
963f9c80 | 1285 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1286 | |
1287 | struct step_over_info | |
1288 | { | |
963f9c80 PA |
1289 | /* If we're stepping past a breakpoint, this is the address space |
1290 | and address of the instruction the breakpoint is set at. We'll | |
1291 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1292 | non-NULL. */ | |
31e77af2 | 1293 | struct address_space *aspace; |
31e77af2 | 1294 | CORE_ADDR address; |
963f9c80 PA |
1295 | |
1296 | /* The instruction being stepped over triggers a nonsteppable | |
1297 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1298 | int nonsteppable_watchpoint_p; | |
21edc42f YQ |
1299 | |
1300 | /* The thread's global number. */ | |
1301 | int thread; | |
31e77af2 PA |
1302 | }; |
1303 | ||
1304 | /* The step-over info of the location that is being stepped over. | |
1305 | ||
1306 | Note that with async/breakpoint always-inserted mode, a user might | |
1307 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1308 | being stepped over. As setting a new breakpoint inserts all | |
1309 | breakpoints, we need to make sure the breakpoint being stepped over | |
1310 | isn't inserted then. We do that by only clearing the step-over | |
1311 | info when the step-over is actually finished (or aborted). | |
1312 | ||
1313 | Presently GDB can only step over one breakpoint at any given time. | |
1314 | Given threads that can't run code in the same address space as the | |
1315 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1316 | to step-over at most one breakpoint per address space (so this info | |
1317 | could move to the address space object if/when GDB is extended). | |
1318 | The set of breakpoints being stepped over will normally be much | |
1319 | smaller than the set of all breakpoints, so a flag in the | |
1320 | breakpoint location structure would be wasteful. A separate list | |
1321 | also saves complexity and run-time, as otherwise we'd have to go | |
1322 | through all breakpoint locations clearing their flag whenever we | |
1323 | start a new sequence. Similar considerations weigh against storing | |
1324 | this info in the thread object. Plus, not all step overs actually | |
1325 | have breakpoint locations -- e.g., stepping past a single-step | |
1326 | breakpoint, or stepping to complete a non-continuable | |
1327 | watchpoint. */ | |
1328 | static struct step_over_info step_over_info; | |
1329 | ||
1330 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1331 | stepping over. |
1332 | N.B. We record the aspace and address now, instead of say just the thread, | |
1333 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1334 | |
1335 | static void | |
963f9c80 | 1336 | set_step_over_info (struct address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1337 | int nonsteppable_watchpoint_p, |
1338 | int thread) | |
31e77af2 PA |
1339 | { |
1340 | step_over_info.aspace = aspace; | |
1341 | step_over_info.address = address; | |
963f9c80 | 1342 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1343 | step_over_info.thread = thread; |
31e77af2 PA |
1344 | } |
1345 | ||
1346 | /* Called when we're not longer stepping over a breakpoint / an | |
1347 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1348 | ||
1349 | static void | |
1350 | clear_step_over_info (void) | |
1351 | { | |
372316f1 PA |
1352 | if (debug_infrun) |
1353 | fprintf_unfiltered (gdb_stdlog, | |
1354 | "infrun: clear_step_over_info\n"); | |
31e77af2 PA |
1355 | step_over_info.aspace = NULL; |
1356 | step_over_info.address = 0; | |
963f9c80 | 1357 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1358 | step_over_info.thread = -1; |
31e77af2 PA |
1359 | } |
1360 | ||
7f89fd65 | 1361 | /* See infrun.h. */ |
31e77af2 PA |
1362 | |
1363 | int | |
1364 | stepping_past_instruction_at (struct address_space *aspace, | |
1365 | CORE_ADDR address) | |
1366 | { | |
1367 | return (step_over_info.aspace != NULL | |
1368 | && breakpoint_address_match (aspace, address, | |
1369 | step_over_info.aspace, | |
1370 | step_over_info.address)); | |
1371 | } | |
1372 | ||
963f9c80 PA |
1373 | /* See infrun.h. */ |
1374 | ||
21edc42f YQ |
1375 | int |
1376 | thread_is_stepping_over_breakpoint (int thread) | |
1377 | { | |
1378 | return (step_over_info.thread != -1 | |
1379 | && thread == step_over_info.thread); | |
1380 | } | |
1381 | ||
1382 | /* See infrun.h. */ | |
1383 | ||
963f9c80 PA |
1384 | int |
1385 | stepping_past_nonsteppable_watchpoint (void) | |
1386 | { | |
1387 | return step_over_info.nonsteppable_watchpoint_p; | |
1388 | } | |
1389 | ||
6cc83d2a PA |
1390 | /* Returns true if step-over info is valid. */ |
1391 | ||
1392 | static int | |
1393 | step_over_info_valid_p (void) | |
1394 | { | |
963f9c80 PA |
1395 | return (step_over_info.aspace != NULL |
1396 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1397 | } |
1398 | ||
c906108c | 1399 | \f |
237fc4c9 PA |
1400 | /* Displaced stepping. */ |
1401 | ||
1402 | /* In non-stop debugging mode, we must take special care to manage | |
1403 | breakpoints properly; in particular, the traditional strategy for | |
1404 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1405 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1406 | breakpoint it has hit while ensuring that other threads running | |
1407 | concurrently will hit the breakpoint as they should. | |
1408 | ||
1409 | The traditional way to step a thread T off a breakpoint in a | |
1410 | multi-threaded program in all-stop mode is as follows: | |
1411 | ||
1412 | a0) Initially, all threads are stopped, and breakpoints are not | |
1413 | inserted. | |
1414 | a1) We single-step T, leaving breakpoints uninserted. | |
1415 | a2) We insert breakpoints, and resume all threads. | |
1416 | ||
1417 | In non-stop debugging, however, this strategy is unsuitable: we | |
1418 | don't want to have to stop all threads in the system in order to | |
1419 | continue or step T past a breakpoint. Instead, we use displaced | |
1420 | stepping: | |
1421 | ||
1422 | n0) Initially, T is stopped, other threads are running, and | |
1423 | breakpoints are inserted. | |
1424 | n1) We copy the instruction "under" the breakpoint to a separate | |
1425 | location, outside the main code stream, making any adjustments | |
1426 | to the instruction, register, and memory state as directed by | |
1427 | T's architecture. | |
1428 | n2) We single-step T over the instruction at its new location. | |
1429 | n3) We adjust the resulting register and memory state as directed | |
1430 | by T's architecture. This includes resetting T's PC to point | |
1431 | back into the main instruction stream. | |
1432 | n4) We resume T. | |
1433 | ||
1434 | This approach depends on the following gdbarch methods: | |
1435 | ||
1436 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1437 | indicate where to copy the instruction, and how much space must | |
1438 | be reserved there. We use these in step n1. | |
1439 | ||
1440 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1441 | address, and makes any necessary adjustments to the instruction, | |
1442 | register contents, and memory. We use this in step n1. | |
1443 | ||
1444 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
1445 | we have successfuly single-stepped the instruction, to yield the | |
1446 | same effect the instruction would have had if we had executed it | |
1447 | at its original address. We use this in step n3. | |
1448 | ||
1449 | - gdbarch_displaced_step_free_closure provides cleanup. | |
1450 | ||
1451 | The gdbarch_displaced_step_copy_insn and | |
1452 | gdbarch_displaced_step_fixup functions must be written so that | |
1453 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1454 | single-stepping across the copied instruction, and then applying | |
1455 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1456 | thread's memory and registers as stepping the instruction in place | |
1457 | would have. Exactly which responsibilities fall to the copy and | |
1458 | which fall to the fixup is up to the author of those functions. | |
1459 | ||
1460 | See the comments in gdbarch.sh for details. | |
1461 | ||
1462 | Note that displaced stepping and software single-step cannot | |
1463 | currently be used in combination, although with some care I think | |
1464 | they could be made to. Software single-step works by placing | |
1465 | breakpoints on all possible subsequent instructions; if the | |
1466 | displaced instruction is a PC-relative jump, those breakpoints | |
1467 | could fall in very strange places --- on pages that aren't | |
1468 | executable, or at addresses that are not proper instruction | |
1469 | boundaries. (We do generally let other threads run while we wait | |
1470 | to hit the software single-step breakpoint, and they might | |
1471 | encounter such a corrupted instruction.) One way to work around | |
1472 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1473 | simulate the effect of PC-relative instructions (and return NULL) | |
1474 | on architectures that use software single-stepping. | |
1475 | ||
1476 | In non-stop mode, we can have independent and simultaneous step | |
1477 | requests, so more than one thread may need to simultaneously step | |
1478 | over a breakpoint. The current implementation assumes there is | |
1479 | only one scratch space per process. In this case, we have to | |
1480 | serialize access to the scratch space. If thread A wants to step | |
1481 | over a breakpoint, but we are currently waiting for some other | |
1482 | thread to complete a displaced step, we leave thread A stopped and | |
1483 | place it in the displaced_step_request_queue. Whenever a displaced | |
1484 | step finishes, we pick the next thread in the queue and start a new | |
1485 | displaced step operation on it. See displaced_step_prepare and | |
1486 | displaced_step_fixup for details. */ | |
1487 | ||
fc1cf338 PA |
1488 | /* Per-inferior displaced stepping state. */ |
1489 | struct displaced_step_inferior_state | |
1490 | { | |
1491 | /* Pointer to next in linked list. */ | |
1492 | struct displaced_step_inferior_state *next; | |
1493 | ||
1494 | /* The process this displaced step state refers to. */ | |
1495 | int pid; | |
1496 | ||
3fc8eb30 PA |
1497 | /* True if preparing a displaced step ever failed. If so, we won't |
1498 | try displaced stepping for this inferior again. */ | |
1499 | int failed_before; | |
1500 | ||
fc1cf338 PA |
1501 | /* If this is not null_ptid, this is the thread carrying out a |
1502 | displaced single-step in process PID. This thread's state will | |
1503 | require fixing up once it has completed its step. */ | |
1504 | ptid_t step_ptid; | |
1505 | ||
1506 | /* The architecture the thread had when we stepped it. */ | |
1507 | struct gdbarch *step_gdbarch; | |
1508 | ||
1509 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
1510 | for post-step cleanup. */ | |
1511 | struct displaced_step_closure *step_closure; | |
1512 | ||
1513 | /* The address of the original instruction, and the copy we | |
1514 | made. */ | |
1515 | CORE_ADDR step_original, step_copy; | |
1516 | ||
1517 | /* Saved contents of copy area. */ | |
1518 | gdb_byte *step_saved_copy; | |
1519 | }; | |
1520 | ||
1521 | /* The list of states of processes involved in displaced stepping | |
1522 | presently. */ | |
1523 | static struct displaced_step_inferior_state *displaced_step_inferior_states; | |
1524 | ||
1525 | /* Get the displaced stepping state of process PID. */ | |
1526 | ||
1527 | static struct displaced_step_inferior_state * | |
1528 | get_displaced_stepping_state (int pid) | |
1529 | { | |
1530 | struct displaced_step_inferior_state *state; | |
1531 | ||
1532 | for (state = displaced_step_inferior_states; | |
1533 | state != NULL; | |
1534 | state = state->next) | |
1535 | if (state->pid == pid) | |
1536 | return state; | |
1537 | ||
1538 | return NULL; | |
1539 | } | |
1540 | ||
372316f1 PA |
1541 | /* Returns true if any inferior has a thread doing a displaced |
1542 | step. */ | |
1543 | ||
1544 | static int | |
1545 | displaced_step_in_progress_any_inferior (void) | |
1546 | { | |
1547 | struct displaced_step_inferior_state *state; | |
1548 | ||
1549 | for (state = displaced_step_inferior_states; | |
1550 | state != NULL; | |
1551 | state = state->next) | |
1552 | if (!ptid_equal (state->step_ptid, null_ptid)) | |
1553 | return 1; | |
1554 | ||
1555 | return 0; | |
1556 | } | |
1557 | ||
c0987663 YQ |
1558 | /* Return true if thread represented by PTID is doing a displaced |
1559 | step. */ | |
1560 | ||
1561 | static int | |
1562 | displaced_step_in_progress_thread (ptid_t ptid) | |
1563 | { | |
1564 | struct displaced_step_inferior_state *displaced; | |
1565 | ||
1566 | gdb_assert (!ptid_equal (ptid, null_ptid)); | |
1567 | ||
1568 | displaced = get_displaced_stepping_state (ptid_get_pid (ptid)); | |
1569 | ||
1570 | return (displaced != NULL && ptid_equal (displaced->step_ptid, ptid)); | |
1571 | } | |
1572 | ||
8f572e5c PA |
1573 | /* Return true if process PID has a thread doing a displaced step. */ |
1574 | ||
1575 | static int | |
1576 | displaced_step_in_progress (int pid) | |
1577 | { | |
1578 | struct displaced_step_inferior_state *displaced; | |
1579 | ||
1580 | displaced = get_displaced_stepping_state (pid); | |
1581 | if (displaced != NULL && !ptid_equal (displaced->step_ptid, null_ptid)) | |
1582 | return 1; | |
1583 | ||
1584 | return 0; | |
1585 | } | |
1586 | ||
fc1cf338 PA |
1587 | /* Add a new displaced stepping state for process PID to the displaced |
1588 | stepping state list, or return a pointer to an already existing | |
1589 | entry, if it already exists. Never returns NULL. */ | |
1590 | ||
1591 | static struct displaced_step_inferior_state * | |
1592 | add_displaced_stepping_state (int pid) | |
1593 | { | |
1594 | struct displaced_step_inferior_state *state; | |
1595 | ||
1596 | for (state = displaced_step_inferior_states; | |
1597 | state != NULL; | |
1598 | state = state->next) | |
1599 | if (state->pid == pid) | |
1600 | return state; | |
237fc4c9 | 1601 | |
8d749320 | 1602 | state = XCNEW (struct displaced_step_inferior_state); |
fc1cf338 PA |
1603 | state->pid = pid; |
1604 | state->next = displaced_step_inferior_states; | |
1605 | displaced_step_inferior_states = state; | |
237fc4c9 | 1606 | |
fc1cf338 PA |
1607 | return state; |
1608 | } | |
1609 | ||
a42244db YQ |
1610 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1611 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1612 | return NULL. */ | |
1613 | ||
1614 | struct displaced_step_closure* | |
1615 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1616 | { | |
1617 | struct displaced_step_inferior_state *displaced | |
1618 | = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); | |
1619 | ||
1620 | /* If checking the mode of displaced instruction in copy area. */ | |
1621 | if (displaced && !ptid_equal (displaced->step_ptid, null_ptid) | |
1622 | && (displaced->step_copy == addr)) | |
1623 | return displaced->step_closure; | |
1624 | ||
1625 | return NULL; | |
1626 | } | |
1627 | ||
fc1cf338 | 1628 | /* Remove the displaced stepping state of process PID. */ |
237fc4c9 | 1629 | |
fc1cf338 PA |
1630 | static void |
1631 | remove_displaced_stepping_state (int pid) | |
1632 | { | |
1633 | struct displaced_step_inferior_state *it, **prev_next_p; | |
237fc4c9 | 1634 | |
fc1cf338 PA |
1635 | gdb_assert (pid != 0); |
1636 | ||
1637 | it = displaced_step_inferior_states; | |
1638 | prev_next_p = &displaced_step_inferior_states; | |
1639 | while (it) | |
1640 | { | |
1641 | if (it->pid == pid) | |
1642 | { | |
1643 | *prev_next_p = it->next; | |
1644 | xfree (it); | |
1645 | return; | |
1646 | } | |
1647 | ||
1648 | prev_next_p = &it->next; | |
1649 | it = *prev_next_p; | |
1650 | } | |
1651 | } | |
1652 | ||
1653 | static void | |
1654 | infrun_inferior_exit (struct inferior *inf) | |
1655 | { | |
1656 | remove_displaced_stepping_state (inf->pid); | |
1657 | } | |
237fc4c9 | 1658 | |
fff08868 HZ |
1659 | /* If ON, and the architecture supports it, GDB will use displaced |
1660 | stepping to step over breakpoints. If OFF, or if the architecture | |
1661 | doesn't support it, GDB will instead use the traditional | |
1662 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1663 | decide which technique to use to step over breakpoints depending on | |
1664 | which of all-stop or non-stop mode is active --- displaced stepping | |
1665 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1666 | ||
72d0e2c5 | 1667 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1668 | |
237fc4c9 PA |
1669 | static void |
1670 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1671 | struct cmd_list_element *c, | |
1672 | const char *value) | |
1673 | { | |
72d0e2c5 | 1674 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1675 | fprintf_filtered (file, |
1676 | _("Debugger's willingness to use displaced stepping " | |
1677 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1678 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1679 | else |
3e43a32a MS |
1680 | fprintf_filtered (file, |
1681 | _("Debugger's willingness to use displaced stepping " | |
1682 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1683 | } |
1684 | ||
fff08868 | 1685 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1686 | over breakpoints of thread TP. */ |
fff08868 | 1687 | |
237fc4c9 | 1688 | static int |
3fc8eb30 | 1689 | use_displaced_stepping (struct thread_info *tp) |
237fc4c9 | 1690 | { |
3fc8eb30 PA |
1691 | struct regcache *regcache = get_thread_regcache (tp->ptid); |
1692 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1693 | struct displaced_step_inferior_state *displaced_state; | |
1694 | ||
1695 | displaced_state = get_displaced_stepping_state (ptid_get_pid (tp->ptid)); | |
1696 | ||
fbea99ea PA |
1697 | return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO |
1698 | && target_is_non_stop_p ()) | |
72d0e2c5 | 1699 | || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) |
96429cc8 | 1700 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
3fc8eb30 PA |
1701 | && find_record_target () == NULL |
1702 | && (displaced_state == NULL | |
1703 | || !displaced_state->failed_before)); | |
237fc4c9 PA |
1704 | } |
1705 | ||
1706 | /* Clean out any stray displaced stepping state. */ | |
1707 | static void | |
fc1cf338 | 1708 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1709 | { |
1710 | /* Indicate that there is no cleanup pending. */ | |
fc1cf338 | 1711 | displaced->step_ptid = null_ptid; |
237fc4c9 | 1712 | |
fc1cf338 | 1713 | if (displaced->step_closure) |
237fc4c9 | 1714 | { |
fc1cf338 PA |
1715 | gdbarch_displaced_step_free_closure (displaced->step_gdbarch, |
1716 | displaced->step_closure); | |
1717 | displaced->step_closure = NULL; | |
237fc4c9 PA |
1718 | } |
1719 | } | |
1720 | ||
1721 | static void | |
fc1cf338 | 1722 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1723 | { |
9a3c8263 SM |
1724 | struct displaced_step_inferior_state *state |
1725 | = (struct displaced_step_inferior_state *) arg; | |
fc1cf338 PA |
1726 | |
1727 | displaced_step_clear (state); | |
237fc4c9 PA |
1728 | } |
1729 | ||
1730 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1731 | void | |
1732 | displaced_step_dump_bytes (struct ui_file *file, | |
1733 | const gdb_byte *buf, | |
1734 | size_t len) | |
1735 | { | |
1736 | int i; | |
1737 | ||
1738 | for (i = 0; i < len; i++) | |
1739 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1740 | fputs_unfiltered ("\n", file); | |
1741 | } | |
1742 | ||
1743 | /* Prepare to single-step, using displaced stepping. | |
1744 | ||
1745 | Note that we cannot use displaced stepping when we have a signal to | |
1746 | deliver. If we have a signal to deliver and an instruction to step | |
1747 | over, then after the step, there will be no indication from the | |
1748 | target whether the thread entered a signal handler or ignored the | |
1749 | signal and stepped over the instruction successfully --- both cases | |
1750 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1751 | fixup, and in the second case we must --- but we can't tell which. | |
1752 | Comments in the code for 'random signals' in handle_inferior_event | |
1753 | explain how we handle this case instead. | |
1754 | ||
1755 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1756 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1757 | if this instruction can't be displaced stepped. */ | |
1758 | ||
237fc4c9 | 1759 | static int |
3fc8eb30 | 1760 | displaced_step_prepare_throw (ptid_t ptid) |
237fc4c9 | 1761 | { |
ad53cd71 | 1762 | struct cleanup *old_cleanups, *ignore_cleanups; |
c1e36e3e | 1763 | struct thread_info *tp = find_thread_ptid (ptid); |
237fc4c9 PA |
1764 | struct regcache *regcache = get_thread_regcache (ptid); |
1765 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
d35ae833 | 1766 | struct address_space *aspace = get_regcache_aspace (regcache); |
237fc4c9 PA |
1767 | CORE_ADDR original, copy; |
1768 | ULONGEST len; | |
1769 | struct displaced_step_closure *closure; | |
fc1cf338 | 1770 | struct displaced_step_inferior_state *displaced; |
9e529e1d | 1771 | int status; |
237fc4c9 PA |
1772 | |
1773 | /* We should never reach this function if the architecture does not | |
1774 | support displaced stepping. */ | |
1775 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1776 | ||
c2829269 PA |
1777 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1778 | gdb_assert (tp->control.trap_expected); | |
1779 | ||
c1e36e3e PA |
1780 | /* Disable range stepping while executing in the scratch pad. We |
1781 | want a single-step even if executing the displaced instruction in | |
1782 | the scratch buffer lands within the stepping range (e.g., a | |
1783 | jump/branch). */ | |
1784 | tp->control.may_range_step = 0; | |
1785 | ||
fc1cf338 PA |
1786 | /* We have to displaced step one thread at a time, as we only have |
1787 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1788 | |
fc1cf338 PA |
1789 | displaced = add_displaced_stepping_state (ptid_get_pid (ptid)); |
1790 | ||
1791 | if (!ptid_equal (displaced->step_ptid, null_ptid)) | |
237fc4c9 PA |
1792 | { |
1793 | /* Already waiting for a displaced step to finish. Defer this | |
1794 | request and place in queue. */ | |
237fc4c9 PA |
1795 | |
1796 | if (debug_displaced) | |
1797 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1798 | "displaced: deferring step of %s\n", |
237fc4c9 PA |
1799 | target_pid_to_str (ptid)); |
1800 | ||
c2829269 | 1801 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1802 | return 0; |
1803 | } | |
1804 | else | |
1805 | { | |
1806 | if (debug_displaced) | |
1807 | fprintf_unfiltered (gdb_stdlog, | |
1808 | "displaced: stepping %s now\n", | |
1809 | target_pid_to_str (ptid)); | |
1810 | } | |
1811 | ||
fc1cf338 | 1812 | displaced_step_clear (displaced); |
237fc4c9 | 1813 | |
ad53cd71 PA |
1814 | old_cleanups = save_inferior_ptid (); |
1815 | inferior_ptid = ptid; | |
1816 | ||
515630c5 | 1817 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1818 | |
1819 | copy = gdbarch_displaced_step_location (gdbarch); | |
1820 | len = gdbarch_max_insn_length (gdbarch); | |
1821 | ||
d35ae833 PA |
1822 | if (breakpoint_in_range_p (aspace, copy, len)) |
1823 | { | |
1824 | /* There's a breakpoint set in the scratch pad location range | |
1825 | (which is usually around the entry point). We'd either | |
1826 | install it before resuming, which would overwrite/corrupt the | |
1827 | scratch pad, or if it was already inserted, this displaced | |
1828 | step would overwrite it. The latter is OK in the sense that | |
1829 | we already assume that no thread is going to execute the code | |
1830 | in the scratch pad range (after initial startup) anyway, but | |
1831 | the former is unacceptable. Simply punt and fallback to | |
1832 | stepping over this breakpoint in-line. */ | |
1833 | if (debug_displaced) | |
1834 | { | |
1835 | fprintf_unfiltered (gdb_stdlog, | |
1836 | "displaced: breakpoint set in scratch pad. " | |
1837 | "Stepping over breakpoint in-line instead.\n"); | |
1838 | } | |
1839 | ||
1840 | do_cleanups (old_cleanups); | |
1841 | return -1; | |
1842 | } | |
1843 | ||
237fc4c9 | 1844 | /* Save the original contents of the copy area. */ |
224c3ddb | 1845 | displaced->step_saved_copy = (gdb_byte *) xmalloc (len); |
ad53cd71 | 1846 | ignore_cleanups = make_cleanup (free_current_contents, |
fc1cf338 | 1847 | &displaced->step_saved_copy); |
9e529e1d JK |
1848 | status = target_read_memory (copy, displaced->step_saved_copy, len); |
1849 | if (status != 0) | |
1850 | throw_error (MEMORY_ERROR, | |
1851 | _("Error accessing memory address %s (%s) for " | |
1852 | "displaced-stepping scratch space."), | |
1853 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1854 | if (debug_displaced) |
1855 | { | |
5af949e3 UW |
1856 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1857 | paddress (gdbarch, copy)); | |
fc1cf338 PA |
1858 | displaced_step_dump_bytes (gdb_stdlog, |
1859 | displaced->step_saved_copy, | |
1860 | len); | |
237fc4c9 PA |
1861 | }; |
1862 | ||
1863 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1864 | original, copy, regcache); |
7f03bd92 PA |
1865 | if (closure == NULL) |
1866 | { | |
1867 | /* The architecture doesn't know how or want to displaced step | |
1868 | this instruction or instruction sequence. Fallback to | |
1869 | stepping over the breakpoint in-line. */ | |
1870 | do_cleanups (old_cleanups); | |
1871 | return -1; | |
1872 | } | |
237fc4c9 | 1873 | |
9f5a595d UW |
1874 | /* Save the information we need to fix things up if the step |
1875 | succeeds. */ | |
fc1cf338 PA |
1876 | displaced->step_ptid = ptid; |
1877 | displaced->step_gdbarch = gdbarch; | |
1878 | displaced->step_closure = closure; | |
1879 | displaced->step_original = original; | |
1880 | displaced->step_copy = copy; | |
9f5a595d | 1881 | |
fc1cf338 | 1882 | make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1883 | |
1884 | /* Resume execution at the copy. */ | |
515630c5 | 1885 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1886 | |
ad53cd71 PA |
1887 | discard_cleanups (ignore_cleanups); |
1888 | ||
1889 | do_cleanups (old_cleanups); | |
237fc4c9 PA |
1890 | |
1891 | if (debug_displaced) | |
5af949e3 UW |
1892 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1893 | paddress (gdbarch, copy)); | |
237fc4c9 | 1894 | |
237fc4c9 PA |
1895 | return 1; |
1896 | } | |
1897 | ||
3fc8eb30 PA |
1898 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1899 | attempts at displaced stepping if we get a memory error. */ | |
1900 | ||
1901 | static int | |
1902 | displaced_step_prepare (ptid_t ptid) | |
1903 | { | |
1904 | int prepared = -1; | |
1905 | ||
1906 | TRY | |
1907 | { | |
1908 | prepared = displaced_step_prepare_throw (ptid); | |
1909 | } | |
1910 | CATCH (ex, RETURN_MASK_ERROR) | |
1911 | { | |
1912 | struct displaced_step_inferior_state *displaced_state; | |
1913 | ||
16b41842 PA |
1914 | if (ex.error != MEMORY_ERROR |
1915 | && ex.error != NOT_SUPPORTED_ERROR) | |
3fc8eb30 PA |
1916 | throw_exception (ex); |
1917 | ||
1918 | if (debug_infrun) | |
1919 | { | |
1920 | fprintf_unfiltered (gdb_stdlog, | |
1921 | "infrun: disabling displaced stepping: %s\n", | |
1922 | ex.message); | |
1923 | } | |
1924 | ||
1925 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1926 | "auto". */ | |
1927 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1928 | { | |
fd7dcb94 | 1929 | warning (_("disabling displaced stepping: %s"), |
3fc8eb30 PA |
1930 | ex.message); |
1931 | } | |
1932 | ||
1933 | /* Disable further displaced stepping attempts. */ | |
1934 | displaced_state | |
1935 | = get_displaced_stepping_state (ptid_get_pid (ptid)); | |
1936 | displaced_state->failed_before = 1; | |
1937 | } | |
1938 | END_CATCH | |
1939 | ||
1940 | return prepared; | |
1941 | } | |
1942 | ||
237fc4c9 | 1943 | static void |
3e43a32a MS |
1944 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1945 | const gdb_byte *myaddr, int len) | |
237fc4c9 PA |
1946 | { |
1947 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
abbb1732 | 1948 | |
237fc4c9 PA |
1949 | inferior_ptid = ptid; |
1950 | write_memory (memaddr, myaddr, len); | |
1951 | do_cleanups (ptid_cleanup); | |
1952 | } | |
1953 | ||
e2d96639 YQ |
1954 | /* Restore the contents of the copy area for thread PTID. */ |
1955 | ||
1956 | static void | |
1957 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1958 | ptid_t ptid) | |
1959 | { | |
1960 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1961 | ||
1962 | write_memory_ptid (ptid, displaced->step_copy, | |
1963 | displaced->step_saved_copy, len); | |
1964 | if (debug_displaced) | |
1965 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
1966 | target_pid_to_str (ptid), | |
1967 | paddress (displaced->step_gdbarch, | |
1968 | displaced->step_copy)); | |
1969 | } | |
1970 | ||
372316f1 PA |
1971 | /* If we displaced stepped an instruction successfully, adjust |
1972 | registers and memory to yield the same effect the instruction would | |
1973 | have had if we had executed it at its original address, and return | |
1974 | 1. If the instruction didn't complete, relocate the PC and return | |
1975 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1976 | ||
1977 | static int | |
2ea28649 | 1978 | displaced_step_fixup (ptid_t event_ptid, enum gdb_signal signal) |
237fc4c9 PA |
1979 | { |
1980 | struct cleanup *old_cleanups; | |
fc1cf338 PA |
1981 | struct displaced_step_inferior_state *displaced |
1982 | = get_displaced_stepping_state (ptid_get_pid (event_ptid)); | |
372316f1 | 1983 | int ret; |
fc1cf338 PA |
1984 | |
1985 | /* Was any thread of this process doing a displaced step? */ | |
1986 | if (displaced == NULL) | |
372316f1 | 1987 | return 0; |
237fc4c9 PA |
1988 | |
1989 | /* Was this event for the pid we displaced? */ | |
fc1cf338 PA |
1990 | if (ptid_equal (displaced->step_ptid, null_ptid) |
1991 | || ! ptid_equal (displaced->step_ptid, event_ptid)) | |
372316f1 | 1992 | return 0; |
237fc4c9 | 1993 | |
fc1cf338 | 1994 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 | 1995 | |
e2d96639 | 1996 | displaced_step_restore (displaced, displaced->step_ptid); |
237fc4c9 | 1997 | |
cb71640d PA |
1998 | /* Fixup may need to read memory/registers. Switch to the thread |
1999 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
2000 | the current thread. */ | |
2001 | switch_to_thread (event_ptid); | |
2002 | ||
237fc4c9 | 2003 | /* Did the instruction complete successfully? */ |
cb71640d PA |
2004 | if (signal == GDB_SIGNAL_TRAP |
2005 | && !(target_stopped_by_watchpoint () | |
2006 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
2007 | || target_have_steppable_watchpoint))) | |
237fc4c9 PA |
2008 | { |
2009 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
2010 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
2011 | displaced->step_closure, | |
2012 | displaced->step_original, | |
2013 | displaced->step_copy, | |
2014 | get_thread_regcache (displaced->step_ptid)); | |
372316f1 | 2015 | ret = 1; |
237fc4c9 PA |
2016 | } |
2017 | else | |
2018 | { | |
2019 | /* Since the instruction didn't complete, all we can do is | |
2020 | relocate the PC. */ | |
515630c5 UW |
2021 | struct regcache *regcache = get_thread_regcache (event_ptid); |
2022 | CORE_ADDR pc = regcache_read_pc (regcache); | |
abbb1732 | 2023 | |
fc1cf338 | 2024 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 2025 | regcache_write_pc (regcache, pc); |
372316f1 | 2026 | ret = -1; |
237fc4c9 PA |
2027 | } |
2028 | ||
2029 | do_cleanups (old_cleanups); | |
2030 | ||
fc1cf338 | 2031 | displaced->step_ptid = null_ptid; |
372316f1 PA |
2032 | |
2033 | return ret; | |
c2829269 | 2034 | } |
1c5cfe86 | 2035 | |
4d9d9d04 PA |
2036 | /* Data to be passed around while handling an event. This data is |
2037 | discarded between events. */ | |
2038 | struct execution_control_state | |
2039 | { | |
2040 | ptid_t ptid; | |
2041 | /* The thread that got the event, if this was a thread event; NULL | |
2042 | otherwise. */ | |
2043 | struct thread_info *event_thread; | |
2044 | ||
2045 | struct target_waitstatus ws; | |
2046 | int stop_func_filled_in; | |
2047 | CORE_ADDR stop_func_start; | |
2048 | CORE_ADDR stop_func_end; | |
2049 | const char *stop_func_name; | |
2050 | int wait_some_more; | |
2051 | ||
2052 | /* True if the event thread hit the single-step breakpoint of | |
2053 | another thread. Thus the event doesn't cause a stop, the thread | |
2054 | needs to be single-stepped past the single-step breakpoint before | |
2055 | we can switch back to the original stepping thread. */ | |
2056 | int hit_singlestep_breakpoint; | |
2057 | }; | |
2058 | ||
2059 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
2060 | |
2061 | static void | |
4d9d9d04 PA |
2062 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
2063 | { | |
2064 | memset (ecs, 0, sizeof (*ecs)); | |
2065 | ecs->event_thread = tp; | |
2066 | ecs->ptid = tp->ptid; | |
2067 | } | |
2068 | ||
2069 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
2070 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 2071 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 2072 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
2073 | |
2074 | /* Are there any pending step-over requests? If so, run all we can | |
2075 | now and return true. Otherwise, return false. */ | |
2076 | ||
2077 | static int | |
c2829269 PA |
2078 | start_step_over (void) |
2079 | { | |
2080 | struct thread_info *tp, *next; | |
2081 | ||
372316f1 PA |
2082 | /* Don't start a new step-over if we already have an in-line |
2083 | step-over operation ongoing. */ | |
2084 | if (step_over_info_valid_p ()) | |
2085 | return 0; | |
2086 | ||
c2829269 | 2087 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 2088 | { |
4d9d9d04 PA |
2089 | struct execution_control_state ecss; |
2090 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 2091 | step_over_what step_what; |
372316f1 | 2092 | int must_be_in_line; |
c2829269 | 2093 | |
c65d6b55 PA |
2094 | gdb_assert (!tp->stop_requested); |
2095 | ||
c2829269 | 2096 | next = thread_step_over_chain_next (tp); |
237fc4c9 | 2097 | |
c2829269 PA |
2098 | /* If this inferior already has a displaced step in process, |
2099 | don't start a new one. */ | |
4d9d9d04 | 2100 | if (displaced_step_in_progress (ptid_get_pid (tp->ptid))) |
c2829269 PA |
2101 | continue; |
2102 | ||
372316f1 PA |
2103 | step_what = thread_still_needs_step_over (tp); |
2104 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
2105 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 2106 | && !use_displaced_stepping (tp))); |
372316f1 PA |
2107 | |
2108 | /* We currently stop all threads of all processes to step-over | |
2109 | in-line. If we need to start a new in-line step-over, let | |
2110 | any pending displaced steps finish first. */ | |
2111 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
2112 | return 0; | |
2113 | ||
c2829269 PA |
2114 | thread_step_over_chain_remove (tp); |
2115 | ||
2116 | if (step_over_queue_head == NULL) | |
2117 | { | |
2118 | if (debug_infrun) | |
2119 | fprintf_unfiltered (gdb_stdlog, | |
2120 | "infrun: step-over queue now empty\n"); | |
2121 | } | |
2122 | ||
372316f1 PA |
2123 | if (tp->control.trap_expected |
2124 | || tp->resumed | |
2125 | || tp->executing) | |
ad53cd71 | 2126 | { |
4d9d9d04 PA |
2127 | internal_error (__FILE__, __LINE__, |
2128 | "[%s] has inconsistent state: " | |
372316f1 | 2129 | "trap_expected=%d, resumed=%d, executing=%d\n", |
4d9d9d04 PA |
2130 | target_pid_to_str (tp->ptid), |
2131 | tp->control.trap_expected, | |
372316f1 | 2132 | tp->resumed, |
4d9d9d04 | 2133 | tp->executing); |
ad53cd71 | 2134 | } |
1c5cfe86 | 2135 | |
4d9d9d04 PA |
2136 | if (debug_infrun) |
2137 | fprintf_unfiltered (gdb_stdlog, | |
2138 | "infrun: resuming [%s] for step-over\n", | |
2139 | target_pid_to_str (tp->ptid)); | |
2140 | ||
2141 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2142 | is no longer inserted. In all-stop, we want to keep looking | |
2143 | for a thread that needs a step-over instead of resuming TP, | |
2144 | because we wouldn't be able to resume anything else until the | |
2145 | target stops again. In non-stop, the resume always resumes | |
2146 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2147 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2148 | continue; |
8550d3b3 | 2149 | |
4d9d9d04 PA |
2150 | switch_to_thread (tp->ptid); |
2151 | reset_ecs (ecs, tp); | |
2152 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2153 | |
4d9d9d04 PA |
2154 | if (!ecs->wait_some_more) |
2155 | error (_("Command aborted.")); | |
1c5cfe86 | 2156 | |
372316f1 PA |
2157 | gdb_assert (tp->resumed); |
2158 | ||
2159 | /* If we started a new in-line step-over, we're done. */ | |
2160 | if (step_over_info_valid_p ()) | |
2161 | { | |
2162 | gdb_assert (tp->control.trap_expected); | |
2163 | return 1; | |
2164 | } | |
2165 | ||
fbea99ea | 2166 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2167 | { |
2168 | /* On all-stop, shouldn't have resumed unless we needed a | |
2169 | step over. */ | |
2170 | gdb_assert (tp->control.trap_expected | |
2171 | || tp->step_after_step_resume_breakpoint); | |
2172 | ||
2173 | /* With remote targets (at least), in all-stop, we can't | |
2174 | issue any further remote commands until the program stops | |
2175 | again. */ | |
2176 | return 1; | |
1c5cfe86 | 2177 | } |
c2829269 | 2178 | |
4d9d9d04 PA |
2179 | /* Either the thread no longer needed a step-over, or a new |
2180 | displaced stepping sequence started. Even in the latter | |
2181 | case, continue looking. Maybe we can also start another | |
2182 | displaced step on a thread of other process. */ | |
237fc4c9 | 2183 | } |
4d9d9d04 PA |
2184 | |
2185 | return 0; | |
237fc4c9 PA |
2186 | } |
2187 | ||
5231c1fd PA |
2188 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2189 | holding OLD_PTID. */ | |
2190 | static void | |
2191 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2192 | { | |
fc1cf338 | 2193 | struct displaced_step_inferior_state *displaced; |
5231c1fd PA |
2194 | |
2195 | if (ptid_equal (inferior_ptid, old_ptid)) | |
2196 | inferior_ptid = new_ptid; | |
2197 | ||
fc1cf338 PA |
2198 | for (displaced = displaced_step_inferior_states; |
2199 | displaced; | |
2200 | displaced = displaced->next) | |
2201 | { | |
2202 | if (ptid_equal (displaced->step_ptid, old_ptid)) | |
2203 | displaced->step_ptid = new_ptid; | |
fc1cf338 | 2204 | } |
5231c1fd PA |
2205 | } |
2206 | ||
237fc4c9 PA |
2207 | \f |
2208 | /* Resuming. */ | |
c906108c SS |
2209 | |
2210 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 2211 | static void |
74b7792f | 2212 | resume_cleanups (void *ignore) |
c906108c | 2213 | { |
34b7e8a6 PA |
2214 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2215 | delete_single_step_breakpoints (inferior_thread ()); | |
7c16b83e | 2216 | |
c906108c SS |
2217 | normal_stop (); |
2218 | } | |
2219 | ||
53904c9e AC |
2220 | static const char schedlock_off[] = "off"; |
2221 | static const char schedlock_on[] = "on"; | |
2222 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2223 | static const char schedlock_replay[] = "replay"; |
40478521 | 2224 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2225 | schedlock_off, |
2226 | schedlock_on, | |
2227 | schedlock_step, | |
f2665db5 | 2228 | schedlock_replay, |
ef346e04 AC |
2229 | NULL |
2230 | }; | |
f2665db5 | 2231 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2232 | static void |
2233 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2234 | struct cmd_list_element *c, const char *value) | |
2235 | { | |
3e43a32a MS |
2236 | fprintf_filtered (file, |
2237 | _("Mode for locking scheduler " | |
2238 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2239 | value); |
2240 | } | |
c906108c SS |
2241 | |
2242 | static void | |
96baa820 | 2243 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2244 | { |
eefe576e AC |
2245 | if (!target_can_lock_scheduler) |
2246 | { | |
2247 | scheduler_mode = schedlock_off; | |
2248 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2249 | } | |
c906108c SS |
2250 | } |
2251 | ||
d4db2f36 PA |
2252 | /* True if execution commands resume all threads of all processes by |
2253 | default; otherwise, resume only threads of the current inferior | |
2254 | process. */ | |
2255 | int sched_multi = 0; | |
2256 | ||
2facfe5c DD |
2257 | /* Try to setup for software single stepping over the specified location. |
2258 | Return 1 if target_resume() should use hardware single step. | |
2259 | ||
2260 | GDBARCH the current gdbarch. | |
2261 | PC the location to step over. */ | |
2262 | ||
2263 | static int | |
2264 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2265 | { | |
2266 | int hw_step = 1; | |
2267 | ||
f02253f1 | 2268 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2269 | && gdbarch_software_single_step_p (gdbarch)) |
2270 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2271 | ||
2facfe5c DD |
2272 | return hw_step; |
2273 | } | |
c906108c | 2274 | |
f3263aa4 PA |
2275 | /* See infrun.h. */ |
2276 | ||
09cee04b PA |
2277 | ptid_t |
2278 | user_visible_resume_ptid (int step) | |
2279 | { | |
f3263aa4 | 2280 | ptid_t resume_ptid; |
09cee04b | 2281 | |
09cee04b PA |
2282 | if (non_stop) |
2283 | { | |
2284 | /* With non-stop mode on, threads are always handled | |
2285 | individually. */ | |
2286 | resume_ptid = inferior_ptid; | |
2287 | } | |
2288 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2289 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2290 | { |
f3263aa4 PA |
2291 | /* User-settable 'scheduler' mode requires solo thread |
2292 | resume. */ | |
09cee04b PA |
2293 | resume_ptid = inferior_ptid; |
2294 | } | |
f2665db5 MM |
2295 | else if ((scheduler_mode == schedlock_replay) |
2296 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2297 | { | |
2298 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2299 | mode. */ | |
2300 | resume_ptid = inferior_ptid; | |
2301 | } | |
f3263aa4 PA |
2302 | else if (!sched_multi && target_supports_multi_process ()) |
2303 | { | |
2304 | /* Resume all threads of the current process (and none of other | |
2305 | processes). */ | |
2306 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
2307 | } | |
2308 | else | |
2309 | { | |
2310 | /* Resume all threads of all processes. */ | |
2311 | resume_ptid = RESUME_ALL; | |
2312 | } | |
09cee04b PA |
2313 | |
2314 | return resume_ptid; | |
2315 | } | |
2316 | ||
fbea99ea PA |
2317 | /* Return a ptid representing the set of threads that we will resume, |
2318 | in the perspective of the target, assuming run control handling | |
2319 | does not require leaving some threads stopped (e.g., stepping past | |
2320 | breakpoint). USER_STEP indicates whether we're about to start the | |
2321 | target for a stepping command. */ | |
2322 | ||
2323 | static ptid_t | |
2324 | internal_resume_ptid (int user_step) | |
2325 | { | |
2326 | /* In non-stop, we always control threads individually. Note that | |
2327 | the target may always work in non-stop mode even with "set | |
2328 | non-stop off", in which case user_visible_resume_ptid could | |
2329 | return a wildcard ptid. */ | |
2330 | if (target_is_non_stop_p ()) | |
2331 | return inferior_ptid; | |
2332 | else | |
2333 | return user_visible_resume_ptid (user_step); | |
2334 | } | |
2335 | ||
64ce06e4 PA |
2336 | /* Wrapper for target_resume, that handles infrun-specific |
2337 | bookkeeping. */ | |
2338 | ||
2339 | static void | |
2340 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2341 | { | |
2342 | struct thread_info *tp = inferior_thread (); | |
2343 | ||
c65d6b55 PA |
2344 | gdb_assert (!tp->stop_requested); |
2345 | ||
64ce06e4 PA |
2346 | /* Install inferior's terminal modes. */ |
2347 | target_terminal_inferior (); | |
2348 | ||
2349 | /* Avoid confusing the next resume, if the next stop/resume | |
2350 | happens to apply to another thread. */ | |
2351 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2352 | ||
8f572e5c PA |
2353 | /* Advise target which signals may be handled silently. |
2354 | ||
2355 | If we have removed breakpoints because we are stepping over one | |
2356 | in-line (in any thread), we need to receive all signals to avoid | |
2357 | accidentally skipping a breakpoint during execution of a signal | |
2358 | handler. | |
2359 | ||
2360 | Likewise if we're displaced stepping, otherwise a trap for a | |
2361 | breakpoint in a signal handler might be confused with the | |
2362 | displaced step finishing. We don't make the displaced_step_fixup | |
2363 | step distinguish the cases instead, because: | |
2364 | ||
2365 | - a backtrace while stopped in the signal handler would show the | |
2366 | scratch pad as frame older than the signal handler, instead of | |
2367 | the real mainline code. | |
2368 | ||
2369 | - when the thread is later resumed, the signal handler would | |
2370 | return to the scratch pad area, which would no longer be | |
2371 | valid. */ | |
2372 | if (step_over_info_valid_p () | |
2373 | || displaced_step_in_progress (ptid_get_pid (tp->ptid))) | |
64ce06e4 PA |
2374 | target_pass_signals (0, NULL); |
2375 | else | |
2376 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
2377 | ||
2378 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2379 | |
2380 | target_commit_resume (); | |
64ce06e4 PA |
2381 | } |
2382 | ||
c906108c SS |
2383 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
2384 | wants to interrupt some lengthy single-stepping operation | |
2385 | (for child processes, the SIGINT goes to the inferior, and so | |
2386 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
2387 | other targets, that's not true). | |
2388 | ||
c906108c SS |
2389 | SIG is the signal to give the inferior (zero for none). */ |
2390 | void | |
64ce06e4 | 2391 | resume (enum gdb_signal sig) |
c906108c | 2392 | { |
74b7792f | 2393 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
2394 | struct regcache *regcache = get_current_regcache (); |
2395 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4e1c45ea | 2396 | struct thread_info *tp = inferior_thread (); |
515630c5 | 2397 | CORE_ADDR pc = regcache_read_pc (regcache); |
6c95b8df | 2398 | struct address_space *aspace = get_regcache_aspace (regcache); |
b0f16a3e | 2399 | ptid_t resume_ptid; |
856e7dd6 PA |
2400 | /* This represents the user's step vs continue request. When |
2401 | deciding whether "set scheduler-locking step" applies, it's the | |
2402 | user's intention that counts. */ | |
2403 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2404 | /* This represents what we'll actually request the target to do. |
2405 | This can decay from a step to a continue, if e.g., we need to | |
2406 | implement single-stepping with breakpoints (software | |
2407 | single-step). */ | |
6b403daa | 2408 | int step; |
c7e8a53c | 2409 | |
c65d6b55 | 2410 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2411 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2412 | ||
c906108c SS |
2413 | QUIT; |
2414 | ||
372316f1 PA |
2415 | if (tp->suspend.waitstatus_pending_p) |
2416 | { | |
2417 | if (debug_infrun) | |
2418 | { | |
2419 | char *statstr; | |
2420 | ||
2421 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
2422 | fprintf_unfiltered (gdb_stdlog, | |
2423 | "infrun: resume: thread %s has pending wait status %s " | |
2424 | "(currently_stepping=%d).\n", | |
2425 | target_pid_to_str (tp->ptid), statstr, | |
2426 | currently_stepping (tp)); | |
2427 | xfree (statstr); | |
2428 | } | |
2429 | ||
2430 | tp->resumed = 1; | |
2431 | ||
2432 | /* FIXME: What should we do if we are supposed to resume this | |
2433 | thread with a signal? Maybe we should maintain a queue of | |
2434 | pending signals to deliver. */ | |
2435 | if (sig != GDB_SIGNAL_0) | |
2436 | { | |
fd7dcb94 | 2437 | warning (_("Couldn't deliver signal %s to %s."), |
372316f1 PA |
2438 | gdb_signal_to_name (sig), target_pid_to_str (tp->ptid)); |
2439 | } | |
2440 | ||
2441 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2442 | discard_cleanups (old_cleanups); | |
2443 | ||
2444 | if (target_can_async_p ()) | |
2445 | target_async (1); | |
2446 | return; | |
2447 | } | |
2448 | ||
2449 | tp->stepped_breakpoint = 0; | |
2450 | ||
6b403daa PA |
2451 | /* Depends on stepped_breakpoint. */ |
2452 | step = currently_stepping (tp); | |
2453 | ||
74609e71 YQ |
2454 | if (current_inferior ()->waiting_for_vfork_done) |
2455 | { | |
48f9886d PA |
2456 | /* Don't try to single-step a vfork parent that is waiting for |
2457 | the child to get out of the shared memory region (by exec'ing | |
2458 | or exiting). This is particularly important on software | |
2459 | single-step archs, as the child process would trip on the | |
2460 | software single step breakpoint inserted for the parent | |
2461 | process. Since the parent will not actually execute any | |
2462 | instruction until the child is out of the shared region (such | |
2463 | are vfork's semantics), it is safe to simply continue it. | |
2464 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2465 | the parent, and tell it to `keep_going', which automatically | |
2466 | re-sets it stepping. */ | |
74609e71 YQ |
2467 | if (debug_infrun) |
2468 | fprintf_unfiltered (gdb_stdlog, | |
2469 | "infrun: resume : clear step\n"); | |
a09dd441 | 2470 | step = 0; |
74609e71 YQ |
2471 | } |
2472 | ||
527159b7 | 2473 | if (debug_infrun) |
237fc4c9 | 2474 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 2475 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 2476 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
2477 | step, gdb_signal_to_symbol_string (sig), |
2478 | tp->control.trap_expected, | |
0d9a9a5f PA |
2479 | target_pid_to_str (inferior_ptid), |
2480 | paddress (gdbarch, pc)); | |
c906108c | 2481 | |
c2c6d25f JM |
2482 | /* Normally, by the time we reach `resume', the breakpoints are either |
2483 | removed or inserted, as appropriate. The exception is if we're sitting | |
2484 | at a permanent breakpoint; we need to step over it, but permanent | |
2485 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2486 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2487 | { |
af48d08f PA |
2488 | if (sig != GDB_SIGNAL_0) |
2489 | { | |
2490 | /* We have a signal to pass to the inferior. The resume | |
2491 | may, or may not take us to the signal handler. If this | |
2492 | is a step, we'll need to stop in the signal handler, if | |
2493 | there's one, (if the target supports stepping into | |
2494 | handlers), or in the next mainline instruction, if | |
2495 | there's no handler. If this is a continue, we need to be | |
2496 | sure to run the handler with all breakpoints inserted. | |
2497 | In all cases, set a breakpoint at the current address | |
2498 | (where the handler returns to), and once that breakpoint | |
2499 | is hit, resume skipping the permanent breakpoint. If | |
2500 | that breakpoint isn't hit, then we've stepped into the | |
2501 | signal handler (or hit some other event). We'll delete | |
2502 | the step-resume breakpoint then. */ | |
2503 | ||
2504 | if (debug_infrun) | |
2505 | fprintf_unfiltered (gdb_stdlog, | |
2506 | "infrun: resume: skipping permanent breakpoint, " | |
2507 | "deliver signal first\n"); | |
2508 | ||
2509 | clear_step_over_info (); | |
2510 | tp->control.trap_expected = 0; | |
2511 | ||
2512 | if (tp->control.step_resume_breakpoint == NULL) | |
2513 | { | |
2514 | /* Set a "high-priority" step-resume, as we don't want | |
2515 | user breakpoints at PC to trigger (again) when this | |
2516 | hits. */ | |
2517 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2518 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2519 | ||
2520 | tp->step_after_step_resume_breakpoint = step; | |
2521 | } | |
2522 | ||
2523 | insert_breakpoints (); | |
2524 | } | |
2525 | else | |
2526 | { | |
2527 | /* There's no signal to pass, we can go ahead and skip the | |
2528 | permanent breakpoint manually. */ | |
2529 | if (debug_infrun) | |
2530 | fprintf_unfiltered (gdb_stdlog, | |
2531 | "infrun: resume: skipping permanent breakpoint\n"); | |
2532 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
2533 | /* Update pc to reflect the new address from which we will | |
2534 | execute instructions. */ | |
2535 | pc = regcache_read_pc (regcache); | |
2536 | ||
2537 | if (step) | |
2538 | { | |
2539 | /* We've already advanced the PC, so the stepping part | |
2540 | is done. Now we need to arrange for a trap to be | |
2541 | reported to handle_inferior_event. Set a breakpoint | |
2542 | at the current PC, and run to it. Don't update | |
2543 | prev_pc, because if we end in | |
44a1ee51 PA |
2544 | switch_back_to_stepped_thread, we want the "expected |
2545 | thread advanced also" branch to be taken. IOW, we | |
2546 | don't want this thread to step further from PC | |
af48d08f | 2547 | (overstep). */ |
1ac806b8 | 2548 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2549 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2550 | insert_breakpoints (); | |
2551 | ||
fbea99ea | 2552 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2553 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
af48d08f | 2554 | discard_cleanups (old_cleanups); |
372316f1 | 2555 | tp->resumed = 1; |
af48d08f PA |
2556 | return; |
2557 | } | |
2558 | } | |
6d350bb5 | 2559 | } |
c2c6d25f | 2560 | |
c1e36e3e PA |
2561 | /* If we have a breakpoint to step over, make sure to do a single |
2562 | step only. Same if we have software watchpoints. */ | |
2563 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2564 | tp->control.may_range_step = 0; | |
2565 | ||
237fc4c9 PA |
2566 | /* If enabled, step over breakpoints by executing a copy of the |
2567 | instruction at a different address. | |
2568 | ||
2569 | We can't use displaced stepping when we have a signal to deliver; | |
2570 | the comments for displaced_step_prepare explain why. The | |
2571 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2572 | signals' explain what we do instead. |
2573 | ||
2574 | We can't use displaced stepping when we are waiting for vfork_done | |
2575 | event, displaced stepping breaks the vfork child similarly as single | |
2576 | step software breakpoint. */ | |
3fc8eb30 PA |
2577 | if (tp->control.trap_expected |
2578 | && use_displaced_stepping (tp) | |
cb71640d | 2579 | && !step_over_info_valid_p () |
a493e3e2 | 2580 | && sig == GDB_SIGNAL_0 |
74609e71 | 2581 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2582 | { |
3fc8eb30 | 2583 | int prepared = displaced_step_prepare (inferior_ptid); |
fc1cf338 | 2584 | |
3fc8eb30 | 2585 | if (prepared == 0) |
d56b7306 | 2586 | { |
4d9d9d04 PA |
2587 | if (debug_infrun) |
2588 | fprintf_unfiltered (gdb_stdlog, | |
2589 | "Got placed in step-over queue\n"); | |
2590 | ||
2591 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2592 | discard_cleanups (old_cleanups); |
2593 | return; | |
2594 | } | |
3fc8eb30 PA |
2595 | else if (prepared < 0) |
2596 | { | |
2597 | /* Fallback to stepping over the breakpoint in-line. */ | |
2598 | ||
2599 | if (target_is_non_stop_p ()) | |
2600 | stop_all_threads (); | |
2601 | ||
2602 | set_step_over_info (get_regcache_aspace (regcache), | |
21edc42f | 2603 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2604 | |
2605 | step = maybe_software_singlestep (gdbarch, pc); | |
2606 | ||
2607 | insert_breakpoints (); | |
2608 | } | |
2609 | else if (prepared > 0) | |
2610 | { | |
2611 | struct displaced_step_inferior_state *displaced; | |
99e40580 | 2612 | |
3fc8eb30 PA |
2613 | /* Update pc to reflect the new address from which we will |
2614 | execute instructions due to displaced stepping. */ | |
2615 | pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); | |
ca7781d2 | 2616 | |
3fc8eb30 PA |
2617 | displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); |
2618 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, | |
2619 | displaced->step_closure); | |
2620 | } | |
237fc4c9 PA |
2621 | } |
2622 | ||
2facfe5c | 2623 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2624 | else if (step) |
2facfe5c | 2625 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2626 | |
30852783 UW |
2627 | /* Currently, our software single-step implementation leads to different |
2628 | results than hardware single-stepping in one situation: when stepping | |
2629 | into delivering a signal which has an associated signal handler, | |
2630 | hardware single-step will stop at the first instruction of the handler, | |
2631 | while software single-step will simply skip execution of the handler. | |
2632 | ||
2633 | For now, this difference in behavior is accepted since there is no | |
2634 | easy way to actually implement single-stepping into a signal handler | |
2635 | without kernel support. | |
2636 | ||
2637 | However, there is one scenario where this difference leads to follow-on | |
2638 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2639 | and then single-stepping. In this case, the software single-step | |
2640 | behavior means that even if there is a *breakpoint* in the signal | |
2641 | handler, GDB still would not stop. | |
2642 | ||
2643 | Fortunately, we can at least fix this particular issue. We detect | |
2644 | here the case where we are about to deliver a signal while software | |
2645 | single-stepping with breakpoints removed. In this situation, we | |
2646 | revert the decisions to remove all breakpoints and insert single- | |
2647 | step breakpoints, and instead we install a step-resume breakpoint | |
2648 | at the current address, deliver the signal without stepping, and | |
2649 | once we arrive back at the step-resume breakpoint, actually step | |
2650 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2651 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2652 | && sig != GDB_SIGNAL_0 |
2653 | && step_over_info_valid_p ()) | |
30852783 UW |
2654 | { |
2655 | /* If we have nested signals or a pending signal is delivered | |
2656 | immediately after a handler returns, might might already have | |
2657 | a step-resume breakpoint set on the earlier handler. We cannot | |
2658 | set another step-resume breakpoint; just continue on until the | |
2659 | original breakpoint is hit. */ | |
2660 | if (tp->control.step_resume_breakpoint == NULL) | |
2661 | { | |
2c03e5be | 2662 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2663 | tp->step_after_step_resume_breakpoint = 1; |
2664 | } | |
2665 | ||
34b7e8a6 | 2666 | delete_single_step_breakpoints (tp); |
30852783 | 2667 | |
31e77af2 | 2668 | clear_step_over_info (); |
30852783 | 2669 | tp->control.trap_expected = 0; |
31e77af2 PA |
2670 | |
2671 | insert_breakpoints (); | |
30852783 UW |
2672 | } |
2673 | ||
b0f16a3e SM |
2674 | /* If STEP is set, it's a request to use hardware stepping |
2675 | facilities. But in that case, we should never | |
2676 | use singlestep breakpoint. */ | |
34b7e8a6 | 2677 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2678 | |
fbea99ea | 2679 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2680 | if (tp->control.trap_expected) |
b0f16a3e SM |
2681 | { |
2682 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2683 | hit, either by single-stepping the thread with the breakpoint |
2684 | removed, or by displaced stepping, with the breakpoint inserted. | |
2685 | In the former case, we need to single-step only this thread, | |
2686 | and keep others stopped, as they can miss this breakpoint if | |
2687 | allowed to run. That's not really a problem for displaced | |
2688 | stepping, but, we still keep other threads stopped, in case | |
2689 | another thread is also stopped for a breakpoint waiting for | |
2690 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2691 | resume_ptid = inferior_ptid; |
2692 | } | |
fbea99ea PA |
2693 | else |
2694 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2695 | |
7f5ef605 PA |
2696 | if (execution_direction != EXEC_REVERSE |
2697 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2698 | { |
372316f1 PA |
2699 | /* There are two cases where we currently need to step a |
2700 | breakpoint instruction when we have a signal to deliver: | |
2701 | ||
2702 | - See handle_signal_stop where we handle random signals that | |
2703 | could take out us out of the stepping range. Normally, in | |
2704 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2705 | signal handler with a breakpoint at PC, but there are cases |
2706 | where we should _always_ single-step, even if we have a | |
2707 | step-resume breakpoint, like when a software watchpoint is | |
2708 | set. Assuming single-stepping and delivering a signal at the | |
2709 | same time would takes us to the signal handler, then we could | |
2710 | have removed the breakpoint at PC to step over it. However, | |
2711 | some hardware step targets (like e.g., Mac OS) can't step | |
2712 | into signal handlers, and for those, we need to leave the | |
2713 | breakpoint at PC inserted, as otherwise if the handler | |
2714 | recurses and executes PC again, it'll miss the breakpoint. | |
2715 | So we leave the breakpoint inserted anyway, but we need to | |
2716 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2717 | that adjust_pc_after_break doesn't end up confused. |
2718 | ||
2719 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2720 | in one thread after another thread that was stepping had been | |
2721 | momentarily paused for a step-over. When we re-resume the | |
2722 | stepping thread, it may be resumed from that address with a | |
2723 | breakpoint that hasn't trapped yet. Seen with | |
2724 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2725 | do displaced stepping. */ | |
2726 | ||
2727 | if (debug_infrun) | |
2728 | fprintf_unfiltered (gdb_stdlog, | |
2729 | "infrun: resume: [%s] stepped breakpoint\n", | |
2730 | target_pid_to_str (tp->ptid)); | |
7f5ef605 PA |
2731 | |
2732 | tp->stepped_breakpoint = 1; | |
2733 | ||
b0f16a3e SM |
2734 | /* Most targets can step a breakpoint instruction, thus |
2735 | executing it normally. But if this one cannot, just | |
2736 | continue and we will hit it anyway. */ | |
7f5ef605 | 2737 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2738 | step = 0; |
2739 | } | |
ef5cf84e | 2740 | |
b0f16a3e | 2741 | if (debug_displaced |
cb71640d | 2742 | && tp->control.trap_expected |
3fc8eb30 | 2743 | && use_displaced_stepping (tp) |
cb71640d | 2744 | && !step_over_info_valid_p ()) |
b0f16a3e | 2745 | { |
d9b67d9f | 2746 | struct regcache *resume_regcache = get_thread_regcache (tp->ptid); |
b0f16a3e SM |
2747 | struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache); |
2748 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); | |
2749 | gdb_byte buf[4]; | |
2750 | ||
2751 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2752 | paddress (resume_gdbarch, actual_pc)); | |
2753 | read_memory (actual_pc, buf, sizeof (buf)); | |
2754 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2755 | } | |
237fc4c9 | 2756 | |
b0f16a3e SM |
2757 | if (tp->control.may_range_step) |
2758 | { | |
2759 | /* If we're resuming a thread with the PC out of the step | |
2760 | range, then we're doing some nested/finer run control | |
2761 | operation, like stepping the thread out of the dynamic | |
2762 | linker or the displaced stepping scratch pad. We | |
2763 | shouldn't have allowed a range step then. */ | |
2764 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2765 | } | |
c1e36e3e | 2766 | |
64ce06e4 | 2767 | do_target_resume (resume_ptid, step, sig); |
372316f1 | 2768 | tp->resumed = 1; |
c906108c SS |
2769 | discard_cleanups (old_cleanups); |
2770 | } | |
2771 | \f | |
237fc4c9 | 2772 | /* Proceeding. */ |
c906108c | 2773 | |
4c2f2a79 PA |
2774 | /* See infrun.h. */ |
2775 | ||
2776 | /* Counter that tracks number of user visible stops. This can be used | |
2777 | to tell whether a command has proceeded the inferior past the | |
2778 | current location. This allows e.g., inferior function calls in | |
2779 | breakpoint commands to not interrupt the command list. When the | |
2780 | call finishes successfully, the inferior is standing at the same | |
2781 | breakpoint as if nothing happened (and so we don't call | |
2782 | normal_stop). */ | |
2783 | static ULONGEST current_stop_id; | |
2784 | ||
2785 | /* See infrun.h. */ | |
2786 | ||
2787 | ULONGEST | |
2788 | get_stop_id (void) | |
2789 | { | |
2790 | return current_stop_id; | |
2791 | } | |
2792 | ||
2793 | /* Called when we report a user visible stop. */ | |
2794 | ||
2795 | static void | |
2796 | new_stop_id (void) | |
2797 | { | |
2798 | current_stop_id++; | |
2799 | } | |
2800 | ||
c906108c SS |
2801 | /* Clear out all variables saying what to do when inferior is continued. |
2802 | First do this, then set the ones you want, then call `proceed'. */ | |
2803 | ||
a7212384 UW |
2804 | static void |
2805 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2806 | { |
a7212384 UW |
2807 | if (debug_infrun) |
2808 | fprintf_unfiltered (gdb_stdlog, | |
2809 | "infrun: clear_proceed_status_thread (%s)\n", | |
2810 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 2811 | |
372316f1 PA |
2812 | /* If we're starting a new sequence, then the previous finished |
2813 | single-step is no longer relevant. */ | |
2814 | if (tp->suspend.waitstatus_pending_p) | |
2815 | { | |
2816 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2817 | { | |
2818 | if (debug_infrun) | |
2819 | fprintf_unfiltered (gdb_stdlog, | |
2820 | "infrun: clear_proceed_status: pending " | |
2821 | "event of %s was a finished step. " | |
2822 | "Discarding.\n", | |
2823 | target_pid_to_str (tp->ptid)); | |
2824 | ||
2825 | tp->suspend.waitstatus_pending_p = 0; | |
2826 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2827 | } | |
2828 | else if (debug_infrun) | |
2829 | { | |
2830 | char *statstr; | |
2831 | ||
2832 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
2833 | fprintf_unfiltered (gdb_stdlog, | |
2834 | "infrun: clear_proceed_status_thread: thread %s " | |
2835 | "has pending wait status %s " | |
2836 | "(currently_stepping=%d).\n", | |
2837 | target_pid_to_str (tp->ptid), statstr, | |
2838 | currently_stepping (tp)); | |
2839 | xfree (statstr); | |
2840 | } | |
2841 | } | |
2842 | ||
70509625 PA |
2843 | /* If this signal should not be seen by program, give it zero. |
2844 | Used for debugging signals. */ | |
2845 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2846 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2847 | ||
243a9253 PA |
2848 | thread_fsm_delete (tp->thread_fsm); |
2849 | tp->thread_fsm = NULL; | |
2850 | ||
16c381f0 JK |
2851 | tp->control.trap_expected = 0; |
2852 | tp->control.step_range_start = 0; | |
2853 | tp->control.step_range_end = 0; | |
c1e36e3e | 2854 | tp->control.may_range_step = 0; |
16c381f0 JK |
2855 | tp->control.step_frame_id = null_frame_id; |
2856 | tp->control.step_stack_frame_id = null_frame_id; | |
2857 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2858 | tp->control.step_start_function = NULL; |
a7212384 | 2859 | tp->stop_requested = 0; |
4e1c45ea | 2860 | |
16c381f0 | 2861 | tp->control.stop_step = 0; |
32400beb | 2862 | |
16c381f0 | 2863 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2864 | |
856e7dd6 | 2865 | tp->control.stepping_command = 0; |
17b2616c | 2866 | |
a7212384 | 2867 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2868 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2869 | } |
32400beb | 2870 | |
a7212384 | 2871 | void |
70509625 | 2872 | clear_proceed_status (int step) |
a7212384 | 2873 | { |
f2665db5 MM |
2874 | /* With scheduler-locking replay, stop replaying other threads if we're |
2875 | not replaying the user-visible resume ptid. | |
2876 | ||
2877 | This is a convenience feature to not require the user to explicitly | |
2878 | stop replaying the other threads. We're assuming that the user's | |
2879 | intent is to resume tracing the recorded process. */ | |
2880 | if (!non_stop && scheduler_mode == schedlock_replay | |
2881 | && target_record_is_replaying (minus_one_ptid) | |
2882 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2883 | execution_direction)) | |
2884 | target_record_stop_replaying (); | |
2885 | ||
6c95b8df PA |
2886 | if (!non_stop) |
2887 | { | |
70509625 PA |
2888 | struct thread_info *tp; |
2889 | ptid_t resume_ptid; | |
2890 | ||
2891 | resume_ptid = user_visible_resume_ptid (step); | |
2892 | ||
2893 | /* In all-stop mode, delete the per-thread status of all threads | |
2894 | we're about to resume, implicitly and explicitly. */ | |
2895 | ALL_NON_EXITED_THREADS (tp) | |
2896 | { | |
2897 | if (!ptid_match (tp->ptid, resume_ptid)) | |
2898 | continue; | |
2899 | clear_proceed_status_thread (tp); | |
2900 | } | |
6c95b8df PA |
2901 | } |
2902 | ||
a7212384 UW |
2903 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2904 | { | |
2905 | struct inferior *inferior; | |
2906 | ||
2907 | if (non_stop) | |
2908 | { | |
6c95b8df PA |
2909 | /* If in non-stop mode, only delete the per-thread status of |
2910 | the current thread. */ | |
a7212384 UW |
2911 | clear_proceed_status_thread (inferior_thread ()); |
2912 | } | |
6c95b8df | 2913 | |
d6b48e9c | 2914 | inferior = current_inferior (); |
16c381f0 | 2915 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2916 | } |
2917 | ||
f3b1572e | 2918 | observer_notify_about_to_proceed (); |
c906108c SS |
2919 | } |
2920 | ||
99619bea PA |
2921 | /* Returns true if TP is still stopped at a breakpoint that needs |
2922 | stepping-over in order to make progress. If the breakpoint is gone | |
2923 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2924 | |
2925 | static int | |
6c4cfb24 | 2926 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2927 | { |
2928 | if (tp->stepping_over_breakpoint) | |
2929 | { | |
2930 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
2931 | ||
2932 | if (breakpoint_here_p (get_regcache_aspace (regcache), | |
af48d08f PA |
2933 | regcache_read_pc (regcache)) |
2934 | == ordinary_breakpoint_here) | |
99619bea PA |
2935 | return 1; |
2936 | ||
2937 | tp->stepping_over_breakpoint = 0; | |
2938 | } | |
2939 | ||
2940 | return 0; | |
2941 | } | |
2942 | ||
6c4cfb24 PA |
2943 | /* Check whether thread TP still needs to start a step-over in order |
2944 | to make progress when resumed. Returns an bitwise or of enum | |
2945 | step_over_what bits, indicating what needs to be stepped over. */ | |
2946 | ||
8d297bbf | 2947 | static step_over_what |
6c4cfb24 PA |
2948 | thread_still_needs_step_over (struct thread_info *tp) |
2949 | { | |
8d297bbf | 2950 | step_over_what what = 0; |
6c4cfb24 PA |
2951 | |
2952 | if (thread_still_needs_step_over_bp (tp)) | |
2953 | what |= STEP_OVER_BREAKPOINT; | |
2954 | ||
2955 | if (tp->stepping_over_watchpoint | |
2956 | && !target_have_steppable_watchpoint) | |
2957 | what |= STEP_OVER_WATCHPOINT; | |
2958 | ||
2959 | return what; | |
2960 | } | |
2961 | ||
483805cf PA |
2962 | /* Returns true if scheduler locking applies. STEP indicates whether |
2963 | we're about to do a step/next-like command to a thread. */ | |
2964 | ||
2965 | static int | |
856e7dd6 | 2966 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2967 | { |
2968 | return (scheduler_mode == schedlock_on | |
2969 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2970 | && tp->control.stepping_command) |
2971 | || (scheduler_mode == schedlock_replay | |
2972 | && target_record_will_replay (minus_one_ptid, | |
2973 | execution_direction))); | |
483805cf PA |
2974 | } |
2975 | ||
c906108c SS |
2976 | /* Basic routine for continuing the program in various fashions. |
2977 | ||
2978 | ADDR is the address to resume at, or -1 for resume where stopped. | |
2979 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 2980 | or -1 for act according to how it stopped. |
c906108c | 2981 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
2982 | -1 means return after that and print nothing. |
2983 | You should probably set various step_... variables | |
2984 | before calling here, if you are stepping. | |
c906108c SS |
2985 | |
2986 | You should call clear_proceed_status before calling proceed. */ | |
2987 | ||
2988 | void | |
64ce06e4 | 2989 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2990 | { |
e58b0e63 PA |
2991 | struct regcache *regcache; |
2992 | struct gdbarch *gdbarch; | |
4e1c45ea | 2993 | struct thread_info *tp; |
e58b0e63 | 2994 | CORE_ADDR pc; |
6c95b8df | 2995 | struct address_space *aspace; |
4d9d9d04 PA |
2996 | ptid_t resume_ptid; |
2997 | struct execution_control_state ecss; | |
2998 | struct execution_control_state *ecs = &ecss; | |
2999 | struct cleanup *old_chain; | |
85ad3aaf | 3000 | struct cleanup *defer_resume_cleanup; |
4d9d9d04 | 3001 | int started; |
c906108c | 3002 | |
e58b0e63 PA |
3003 | /* If we're stopped at a fork/vfork, follow the branch set by the |
3004 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
3005 | resuming the current thread. */ | |
3006 | if (!follow_fork ()) | |
3007 | { | |
3008 | /* The target for some reason decided not to resume. */ | |
3009 | normal_stop (); | |
f148b27e PA |
3010 | if (target_can_async_p ()) |
3011 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
3012 | return; |
3013 | } | |
3014 | ||
842951eb PA |
3015 | /* We'll update this if & when we switch to a new thread. */ |
3016 | previous_inferior_ptid = inferior_ptid; | |
3017 | ||
e58b0e63 PA |
3018 | regcache = get_current_regcache (); |
3019 | gdbarch = get_regcache_arch (regcache); | |
6c95b8df | 3020 | aspace = get_regcache_aspace (regcache); |
e58b0e63 | 3021 | pc = regcache_read_pc (regcache); |
2adfaa28 | 3022 | tp = inferior_thread (); |
e58b0e63 | 3023 | |
99619bea PA |
3024 | /* Fill in with reasonable starting values. */ |
3025 | init_thread_stepping_state (tp); | |
3026 | ||
c2829269 PA |
3027 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
3028 | ||
2acceee2 | 3029 | if (addr == (CORE_ADDR) -1) |
c906108c | 3030 | { |
af48d08f PA |
3031 | if (pc == stop_pc |
3032 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here | |
b2175913 | 3033 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
3034 | /* There is a breakpoint at the address we will resume at, |
3035 | step one instruction before inserting breakpoints so that | |
3036 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
3037 | breakpoint). |
3038 | ||
3039 | Note, we don't do this in reverse, because we won't | |
3040 | actually be executing the breakpoint insn anyway. | |
3041 | We'll be (un-)executing the previous instruction. */ | |
99619bea | 3042 | tp->stepping_over_breakpoint = 1; |
515630c5 UW |
3043 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3044 | && gdbarch_single_step_through_delay (gdbarch, | |
3045 | get_current_frame ())) | |
3352ef37 AC |
3046 | /* We stepped onto an instruction that needs to be stepped |
3047 | again before re-inserting the breakpoint, do so. */ | |
99619bea | 3048 | tp->stepping_over_breakpoint = 1; |
c906108c SS |
3049 | } |
3050 | else | |
3051 | { | |
515630c5 | 3052 | regcache_write_pc (regcache, addr); |
c906108c SS |
3053 | } |
3054 | ||
70509625 PA |
3055 | if (siggnal != GDB_SIGNAL_DEFAULT) |
3056 | tp->suspend.stop_signal = siggnal; | |
3057 | ||
4d9d9d04 PA |
3058 | resume_ptid = user_visible_resume_ptid (tp->control.stepping_command); |
3059 | ||
3060 | /* If an exception is thrown from this point on, make sure to | |
3061 | propagate GDB's knowledge of the executing state to the | |
3062 | frontend/user running state. */ | |
3063 | old_chain = make_cleanup (finish_thread_state_cleanup, &resume_ptid); | |
3064 | ||
3065 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3066 | threads (e.g., we might need to set threads stepping over | |
3067 | breakpoints first), from the user/frontend's point of view, all | |
3068 | threads in RESUME_PTID are now running. Unless we're calling an | |
3069 | inferior function, as in that case we pretend the inferior | |
3070 | doesn't run at all. */ | |
3071 | if (!tp->control.in_infcall) | |
3072 | set_running (resume_ptid, 1); | |
17b2616c | 3073 | |
527159b7 | 3074 | if (debug_infrun) |
8a9de0e4 | 3075 | fprintf_unfiltered (gdb_stdlog, |
64ce06e4 | 3076 | "infrun: proceed (addr=%s, signal=%s)\n", |
c9737c08 | 3077 | paddress (gdbarch, addr), |
64ce06e4 | 3078 | gdb_signal_to_symbol_string (siggnal)); |
527159b7 | 3079 | |
4d9d9d04 PA |
3080 | annotate_starting (); |
3081 | ||
3082 | /* Make sure that output from GDB appears before output from the | |
3083 | inferior. */ | |
3084 | gdb_flush (gdb_stdout); | |
3085 | ||
3086 | /* In a multi-threaded task we may select another thread and | |
3087 | then continue or step. | |
3088 | ||
3089 | But if a thread that we're resuming had stopped at a breakpoint, | |
3090 | it will immediately cause another breakpoint stop without any | |
3091 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3092 | we must step over it first. | |
3093 | ||
3094 | Look for threads other than the current (TP) that reported a | |
3095 | breakpoint hit and haven't been resumed yet since. */ | |
3096 | ||
3097 | /* If scheduler locking applies, we can avoid iterating over all | |
3098 | threads. */ | |
3099 | if (!non_stop && !schedlock_applies (tp)) | |
94cc34af | 3100 | { |
4d9d9d04 PA |
3101 | struct thread_info *current = tp; |
3102 | ||
3103 | ALL_NON_EXITED_THREADS (tp) | |
3104 | { | |
3105 | /* Ignore the current thread here. It's handled | |
3106 | afterwards. */ | |
3107 | if (tp == current) | |
3108 | continue; | |
99619bea | 3109 | |
4d9d9d04 PA |
3110 | /* Ignore threads of processes we're not resuming. */ |
3111 | if (!ptid_match (tp->ptid, resume_ptid)) | |
3112 | continue; | |
c906108c | 3113 | |
4d9d9d04 PA |
3114 | if (!thread_still_needs_step_over (tp)) |
3115 | continue; | |
3116 | ||
3117 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3118 | |
99619bea PA |
3119 | if (debug_infrun) |
3120 | fprintf_unfiltered (gdb_stdlog, | |
3121 | "infrun: need to step-over [%s] first\n", | |
4d9d9d04 | 3122 | target_pid_to_str (tp->ptid)); |
99619bea | 3123 | |
4d9d9d04 | 3124 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3125 | } |
31e77af2 | 3126 | |
4d9d9d04 | 3127 | tp = current; |
30852783 UW |
3128 | } |
3129 | ||
4d9d9d04 PA |
3130 | /* Enqueue the current thread last, so that we move all other |
3131 | threads over their breakpoints first. */ | |
3132 | if (tp->stepping_over_breakpoint) | |
3133 | thread_step_over_chain_enqueue (tp); | |
30852783 | 3134 | |
4d9d9d04 PA |
3135 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3136 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3137 | advanced. Must do this before resuming any thread, as in | |
3138 | all-stop/remote, once we resume we can't send any other packet | |
3139 | until the target stops again. */ | |
3140 | tp->prev_pc = regcache_read_pc (regcache); | |
99619bea | 3141 | |
85ad3aaf PA |
3142 | defer_resume_cleanup = make_cleanup_defer_target_commit_resume (); |
3143 | ||
4d9d9d04 | 3144 | started = start_step_over (); |
c906108c | 3145 | |
4d9d9d04 PA |
3146 | if (step_over_info_valid_p ()) |
3147 | { | |
3148 | /* Either this thread started a new in-line step over, or some | |
3149 | other thread was already doing one. In either case, don't | |
3150 | resume anything else until the step-over is finished. */ | |
3151 | } | |
fbea99ea | 3152 | else if (started && !target_is_non_stop_p ()) |
4d9d9d04 PA |
3153 | { |
3154 | /* A new displaced stepping sequence was started. In all-stop, | |
3155 | we can't talk to the target anymore until it next stops. */ | |
3156 | } | |
fbea99ea PA |
3157 | else if (!non_stop && target_is_non_stop_p ()) |
3158 | { | |
3159 | /* In all-stop, but the target is always in non-stop mode. | |
3160 | Start all other threads that are implicitly resumed too. */ | |
3161 | ALL_NON_EXITED_THREADS (tp) | |
3162 | { | |
3163 | /* Ignore threads of processes we're not resuming. */ | |
3164 | if (!ptid_match (tp->ptid, resume_ptid)) | |
3165 | continue; | |
3166 | ||
3167 | if (tp->resumed) | |
3168 | { | |
3169 | if (debug_infrun) | |
3170 | fprintf_unfiltered (gdb_stdlog, | |
3171 | "infrun: proceed: [%s] resumed\n", | |
3172 | target_pid_to_str (tp->ptid)); | |
3173 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
3174 | continue; | |
3175 | } | |
3176 | ||
3177 | if (thread_is_in_step_over_chain (tp)) | |
3178 | { | |
3179 | if (debug_infrun) | |
3180 | fprintf_unfiltered (gdb_stdlog, | |
3181 | "infrun: proceed: [%s] needs step-over\n", | |
3182 | target_pid_to_str (tp->ptid)); | |
3183 | continue; | |
3184 | } | |
3185 | ||
3186 | if (debug_infrun) | |
3187 | fprintf_unfiltered (gdb_stdlog, | |
3188 | "infrun: proceed: resuming %s\n", | |
3189 | target_pid_to_str (tp->ptid)); | |
3190 | ||
3191 | reset_ecs (ecs, tp); | |
3192 | switch_to_thread (tp->ptid); | |
3193 | keep_going_pass_signal (ecs); | |
3194 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3195 | error (_("Command aborted.")); |
fbea99ea PA |
3196 | } |
3197 | } | |
372316f1 | 3198 | else if (!tp->resumed && !thread_is_in_step_over_chain (tp)) |
4d9d9d04 PA |
3199 | { |
3200 | /* The thread wasn't started, and isn't queued, run it now. */ | |
3201 | reset_ecs (ecs, tp); | |
3202 | switch_to_thread (tp->ptid); | |
3203 | keep_going_pass_signal (ecs); | |
3204 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3205 | error (_("Command aborted.")); |
4d9d9d04 | 3206 | } |
c906108c | 3207 | |
85ad3aaf PA |
3208 | do_cleanups (defer_resume_cleanup); |
3209 | target_commit_resume (); | |
3210 | ||
4d9d9d04 | 3211 | discard_cleanups (old_chain); |
c906108c | 3212 | |
0b333c5e PA |
3213 | /* Tell the event loop to wait for it to stop. If the target |
3214 | supports asynchronous execution, it'll do this from within | |
3215 | target_resume. */ | |
362646f5 | 3216 | if (!target_can_async_p ()) |
0b333c5e | 3217 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3218 | } |
c906108c SS |
3219 | \f |
3220 | ||
3221 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3222 | |
c906108c | 3223 | void |
8621d6a9 | 3224 | start_remote (int from_tty) |
c906108c | 3225 | { |
d6b48e9c | 3226 | struct inferior *inferior; |
d6b48e9c PA |
3227 | |
3228 | inferior = current_inferior (); | |
16c381f0 | 3229 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; |
43ff13b4 | 3230 | |
1777feb0 | 3231 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3232 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3233 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3234 | nothing is returned (instead of just blocking). Because of this, |
3235 | targets expecting an immediate response need to, internally, set | |
3236 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3237 | timeout. */ |
6426a772 JM |
3238 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3239 | differentiate to its caller what the state of the target is after | |
3240 | the initial open has been performed. Here we're assuming that | |
3241 | the target has stopped. It should be possible to eventually have | |
3242 | target_open() return to the caller an indication that the target | |
3243 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3244 | for an async run. */ |
e4c8541f | 3245 | wait_for_inferior (); |
8621d6a9 DJ |
3246 | |
3247 | /* Now that the inferior has stopped, do any bookkeeping like | |
3248 | loading shared libraries. We want to do this before normal_stop, | |
3249 | so that the displayed frame is up to date. */ | |
3250 | post_create_inferior (¤t_target, from_tty); | |
3251 | ||
6426a772 | 3252 | normal_stop (); |
c906108c SS |
3253 | } |
3254 | ||
3255 | /* Initialize static vars when a new inferior begins. */ | |
3256 | ||
3257 | void | |
96baa820 | 3258 | init_wait_for_inferior (void) |
c906108c SS |
3259 | { |
3260 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3261 | |
c906108c SS |
3262 | breakpoint_init_inferior (inf_starting); |
3263 | ||
70509625 | 3264 | clear_proceed_status (0); |
9f976b41 | 3265 | |
ca005067 | 3266 | target_last_wait_ptid = minus_one_ptid; |
237fc4c9 | 3267 | |
842951eb | 3268 | previous_inferior_ptid = inferior_ptid; |
0d1e5fa7 | 3269 | |
edb3359d DJ |
3270 | /* Discard any skipped inlined frames. */ |
3271 | clear_inline_frame_state (minus_one_ptid); | |
c906108c | 3272 | } |
237fc4c9 | 3273 | |
c906108c | 3274 | \f |
488f131b | 3275 | |
ec9499be | 3276 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3277 | |
568d6575 UW |
3278 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3279 | struct execution_control_state *ecs); | |
3280 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3281 | struct execution_control_state *ecs); | |
4f5d7f63 | 3282 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3283 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3284 | struct frame_info *); |
611c83ae | 3285 | |
bdc36728 | 3286 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3287 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3288 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3289 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3290 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3291 | |
252fbfc8 PA |
3292 | /* This function is attached as a "thread_stop_requested" observer. |
3293 | Cleanup local state that assumed the PTID was to be resumed, and | |
3294 | report the stop to the frontend. */ | |
3295 | ||
2c0b251b | 3296 | static void |
252fbfc8 PA |
3297 | infrun_thread_stop_requested (ptid_t ptid) |
3298 | { | |
c2829269 | 3299 | struct thread_info *tp; |
252fbfc8 | 3300 | |
c65d6b55 PA |
3301 | /* PTID was requested to stop. If the thread was already stopped, |
3302 | but the user/frontend doesn't know about that yet (e.g., the | |
3303 | thread had been temporarily paused for some step-over), set up | |
3304 | for reporting the stop now. */ | |
c2829269 PA |
3305 | ALL_NON_EXITED_THREADS (tp) |
3306 | if (ptid_match (tp->ptid, ptid)) | |
3307 | { | |
c65d6b55 PA |
3308 | if (tp->state != THREAD_RUNNING) |
3309 | continue; | |
3310 | if (tp->executing) | |
3311 | continue; | |
3312 | ||
3313 | /* Remove matching threads from the step-over queue, so | |
3314 | start_step_over doesn't try to resume them | |
3315 | automatically. */ | |
c2829269 PA |
3316 | if (thread_is_in_step_over_chain (tp)) |
3317 | thread_step_over_chain_remove (tp); | |
252fbfc8 | 3318 | |
c65d6b55 PA |
3319 | /* If the thread is stopped, but the user/frontend doesn't |
3320 | know about that yet, queue a pending event, as if the | |
3321 | thread had just stopped now. Unless the thread already had | |
3322 | a pending event. */ | |
3323 | if (!tp->suspend.waitstatus_pending_p) | |
3324 | { | |
3325 | tp->suspend.waitstatus_pending_p = 1; | |
3326 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3327 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3328 | } | |
3329 | ||
3330 | /* Clear the inline-frame state, since we're re-processing the | |
3331 | stop. */ | |
3332 | clear_inline_frame_state (tp->ptid); | |
3333 | ||
3334 | /* If this thread was paused because some other thread was | |
3335 | doing an inline-step over, let that finish first. Once | |
3336 | that happens, we'll restart all threads and consume pending | |
3337 | stop events then. */ | |
3338 | if (step_over_info_valid_p ()) | |
3339 | continue; | |
3340 | ||
3341 | /* Otherwise we can process the (new) pending event now. Set | |
3342 | it so this pending event is considered by | |
3343 | do_target_wait. */ | |
3344 | tp->resumed = 1; | |
3345 | } | |
252fbfc8 PA |
3346 | } |
3347 | ||
a07daef3 PA |
3348 | static void |
3349 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3350 | { | |
3351 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
3352 | nullify_last_target_wait_ptid (); | |
3353 | } | |
3354 | ||
0cbcdb96 PA |
3355 | /* Delete the step resume, single-step and longjmp/exception resume |
3356 | breakpoints of TP. */ | |
4e1c45ea | 3357 | |
0cbcdb96 PA |
3358 | static void |
3359 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3360 | { |
0cbcdb96 PA |
3361 | delete_step_resume_breakpoint (tp); |
3362 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3363 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3364 | } |
3365 | ||
0cbcdb96 PA |
3366 | /* If the target still has execution, call FUNC for each thread that |
3367 | just stopped. In all-stop, that's all the non-exited threads; in | |
3368 | non-stop, that's the current thread, only. */ | |
3369 | ||
3370 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3371 | (struct thread_info *tp); | |
4e1c45ea PA |
3372 | |
3373 | static void | |
0cbcdb96 | 3374 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3375 | { |
0cbcdb96 | 3376 | if (!target_has_execution || ptid_equal (inferior_ptid, null_ptid)) |
4e1c45ea PA |
3377 | return; |
3378 | ||
fbea99ea | 3379 | if (target_is_non_stop_p ()) |
4e1c45ea | 3380 | { |
0cbcdb96 PA |
3381 | /* If in non-stop mode, only the current thread stopped. */ |
3382 | func (inferior_thread ()); | |
4e1c45ea PA |
3383 | } |
3384 | else | |
0cbcdb96 PA |
3385 | { |
3386 | struct thread_info *tp; | |
3387 | ||
3388 | /* In all-stop mode, all threads have stopped. */ | |
3389 | ALL_NON_EXITED_THREADS (tp) | |
3390 | { | |
3391 | func (tp); | |
3392 | } | |
3393 | } | |
3394 | } | |
3395 | ||
3396 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3397 | the threads that just stopped. */ | |
3398 | ||
3399 | static void | |
3400 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3401 | { | |
3402 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3403 | } |
3404 | ||
3405 | /* Delete the single-step breakpoints of the threads that just | |
3406 | stopped. */ | |
7c16b83e | 3407 | |
34b7e8a6 PA |
3408 | static void |
3409 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3410 | { | |
3411 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3412 | } |
3413 | ||
1777feb0 | 3414 | /* A cleanup wrapper. */ |
4e1c45ea PA |
3415 | |
3416 | static void | |
0cbcdb96 | 3417 | delete_just_stopped_threads_infrun_breakpoints_cleanup (void *arg) |
4e1c45ea | 3418 | { |
0cbcdb96 | 3419 | delete_just_stopped_threads_infrun_breakpoints (); |
4e1c45ea PA |
3420 | } |
3421 | ||
221e1a37 | 3422 | /* See infrun.h. */ |
223698f8 | 3423 | |
221e1a37 | 3424 | void |
223698f8 DE |
3425 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3426 | const struct target_waitstatus *ws) | |
3427 | { | |
3428 | char *status_string = target_waitstatus_to_string (ws); | |
d7e74731 | 3429 | string_file stb; |
223698f8 DE |
3430 | |
3431 | /* The text is split over several lines because it was getting too long. | |
3432 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3433 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3434 | is set. */ | |
3435 | ||
d7e74731 PA |
3436 | stb.printf ("infrun: target_wait (%d.%ld.%ld", |
3437 | ptid_get_pid (waiton_ptid), | |
3438 | ptid_get_lwp (waiton_ptid), | |
3439 | ptid_get_tid (waiton_ptid)); | |
dfd4cc63 | 3440 | if (ptid_get_pid (waiton_ptid) != -1) |
d7e74731 PA |
3441 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid)); |
3442 | stb.printf (", status) =\n"); | |
3443 | stb.printf ("infrun: %d.%ld.%ld [%s],\n", | |
3444 | ptid_get_pid (result_ptid), | |
3445 | ptid_get_lwp (result_ptid), | |
3446 | ptid_get_tid (result_ptid), | |
3447 | target_pid_to_str (result_ptid)); | |
3448 | stb.printf ("infrun: %s\n", status_string); | |
223698f8 DE |
3449 | |
3450 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3451 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3452 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3453 | |
3454 | xfree (status_string); | |
223698f8 DE |
3455 | } |
3456 | ||
372316f1 PA |
3457 | /* Select a thread at random, out of those which are resumed and have |
3458 | had events. */ | |
3459 | ||
3460 | static struct thread_info * | |
3461 | random_pending_event_thread (ptid_t waiton_ptid) | |
3462 | { | |
3463 | struct thread_info *event_tp; | |
3464 | int num_events = 0; | |
3465 | int random_selector; | |
3466 | ||
3467 | /* First see how many events we have. Count only resumed threads | |
3468 | that have an event pending. */ | |
3469 | ALL_NON_EXITED_THREADS (event_tp) | |
3470 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3471 | && event_tp->resumed | |
3472 | && event_tp->suspend.waitstatus_pending_p) | |
3473 | num_events++; | |
3474 | ||
3475 | if (num_events == 0) | |
3476 | return NULL; | |
3477 | ||
3478 | /* Now randomly pick a thread out of those that have had events. */ | |
3479 | random_selector = (int) | |
3480 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
3481 | ||
3482 | if (debug_infrun && num_events > 1) | |
3483 | fprintf_unfiltered (gdb_stdlog, | |
3484 | "infrun: Found %d events, selecting #%d\n", | |
3485 | num_events, random_selector); | |
3486 | ||
3487 | /* Select the Nth thread that has had an event. */ | |
3488 | ALL_NON_EXITED_THREADS (event_tp) | |
3489 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3490 | && event_tp->resumed | |
3491 | && event_tp->suspend.waitstatus_pending_p) | |
3492 | if (random_selector-- == 0) | |
3493 | break; | |
3494 | ||
3495 | return event_tp; | |
3496 | } | |
3497 | ||
3498 | /* Wrapper for target_wait that first checks whether threads have | |
3499 | pending statuses to report before actually asking the target for | |
3500 | more events. */ | |
3501 | ||
3502 | static ptid_t | |
3503 | do_target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
3504 | { | |
3505 | ptid_t event_ptid; | |
3506 | struct thread_info *tp; | |
3507 | ||
3508 | /* First check if there is a resumed thread with a wait status | |
3509 | pending. */ | |
3510 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) | |
3511 | { | |
3512 | tp = random_pending_event_thread (ptid); | |
3513 | } | |
3514 | else | |
3515 | { | |
3516 | if (debug_infrun) | |
3517 | fprintf_unfiltered (gdb_stdlog, | |
3518 | "infrun: Waiting for specific thread %s.\n", | |
3519 | target_pid_to_str (ptid)); | |
3520 | ||
3521 | /* We have a specific thread to check. */ | |
3522 | tp = find_thread_ptid (ptid); | |
3523 | gdb_assert (tp != NULL); | |
3524 | if (!tp->suspend.waitstatus_pending_p) | |
3525 | tp = NULL; | |
3526 | } | |
3527 | ||
3528 | if (tp != NULL | |
3529 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3530 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3531 | { | |
3532 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
3533 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3534 | CORE_ADDR pc; | |
3535 | int discard = 0; | |
3536 | ||
3537 | pc = regcache_read_pc (regcache); | |
3538 | ||
3539 | if (pc != tp->suspend.stop_pc) | |
3540 | { | |
3541 | if (debug_infrun) | |
3542 | fprintf_unfiltered (gdb_stdlog, | |
3543 | "infrun: PC of %s changed. was=%s, now=%s\n", | |
3544 | target_pid_to_str (tp->ptid), | |
3545 | paddress (gdbarch, tp->prev_pc), | |
3546 | paddress (gdbarch, pc)); | |
3547 | discard = 1; | |
3548 | } | |
3549 | else if (!breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3550 | { | |
3551 | if (debug_infrun) | |
3552 | fprintf_unfiltered (gdb_stdlog, | |
3553 | "infrun: previous breakpoint of %s, at %s gone\n", | |
3554 | target_pid_to_str (tp->ptid), | |
3555 | paddress (gdbarch, pc)); | |
3556 | ||
3557 | discard = 1; | |
3558 | } | |
3559 | ||
3560 | if (discard) | |
3561 | { | |
3562 | if (debug_infrun) | |
3563 | fprintf_unfiltered (gdb_stdlog, | |
3564 | "infrun: pending event of %s cancelled.\n", | |
3565 | target_pid_to_str (tp->ptid)); | |
3566 | ||
3567 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3568 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3569 | } | |
3570 | } | |
3571 | ||
3572 | if (tp != NULL) | |
3573 | { | |
3574 | if (debug_infrun) | |
3575 | { | |
3576 | char *statstr; | |
3577 | ||
3578 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
3579 | fprintf_unfiltered (gdb_stdlog, | |
3580 | "infrun: Using pending wait status %s for %s.\n", | |
3581 | statstr, | |
3582 | target_pid_to_str (tp->ptid)); | |
3583 | xfree (statstr); | |
3584 | } | |
3585 | ||
3586 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3587 | if it was a software breakpoint (and the target doesn't | |
3588 | always adjust the PC itself). */ | |
3589 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3590 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3591 | { | |
3592 | struct regcache *regcache; | |
3593 | struct gdbarch *gdbarch; | |
3594 | int decr_pc; | |
3595 | ||
3596 | regcache = get_thread_regcache (tp->ptid); | |
3597 | gdbarch = get_regcache_arch (regcache); | |
3598 | ||
3599 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3600 | if (decr_pc != 0) | |
3601 | { | |
3602 | CORE_ADDR pc; | |
3603 | ||
3604 | pc = regcache_read_pc (regcache); | |
3605 | regcache_write_pc (regcache, pc + decr_pc); | |
3606 | } | |
3607 | } | |
3608 | ||
3609 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3610 | *status = tp->suspend.waitstatus; | |
3611 | tp->suspend.waitstatus_pending_p = 0; | |
3612 | ||
3613 | /* Wake up the event loop again, until all pending events are | |
3614 | processed. */ | |
3615 | if (target_is_async_p ()) | |
3616 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3617 | return tp->ptid; | |
3618 | } | |
3619 | ||
3620 | /* But if we don't find one, we'll have to wait. */ | |
3621 | ||
3622 | if (deprecated_target_wait_hook) | |
3623 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3624 | else | |
3625 | event_ptid = target_wait (ptid, status, options); | |
3626 | ||
3627 | return event_ptid; | |
3628 | } | |
3629 | ||
24291992 PA |
3630 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3631 | detaching while a thread is displaced stepping is a recipe for | |
3632 | crashing it, as nothing would readjust the PC out of the scratch | |
3633 | pad. */ | |
3634 | ||
3635 | void | |
3636 | prepare_for_detach (void) | |
3637 | { | |
3638 | struct inferior *inf = current_inferior (); | |
3639 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
24291992 PA |
3640 | struct displaced_step_inferior_state *displaced; |
3641 | ||
3642 | displaced = get_displaced_stepping_state (inf->pid); | |
3643 | ||
3644 | /* Is any thread of this process displaced stepping? If not, | |
3645 | there's nothing else to do. */ | |
3646 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
3647 | return; | |
3648 | ||
3649 | if (debug_infrun) | |
3650 | fprintf_unfiltered (gdb_stdlog, | |
3651 | "displaced-stepping in-process while detaching"); | |
3652 | ||
9bcb1f16 | 3653 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 PA |
3654 | |
3655 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
3656 | { | |
3657 | struct cleanup *old_chain_2; | |
3658 | struct execution_control_state ecss; | |
3659 | struct execution_control_state *ecs; | |
3660 | ||
3661 | ecs = &ecss; | |
3662 | memset (ecs, 0, sizeof (*ecs)); | |
3663 | ||
3664 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3665 | /* Flush target cache before starting to handle each event. |
3666 | Target was running and cache could be stale. This is just a | |
3667 | heuristic. Running threads may modify target memory, but we | |
3668 | don't get any event. */ | |
3669 | target_dcache_invalidate (); | |
24291992 | 3670 | |
372316f1 | 3671 | ecs->ptid = do_target_wait (pid_ptid, &ecs->ws, 0); |
24291992 PA |
3672 | |
3673 | if (debug_infrun) | |
3674 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3675 | ||
3676 | /* If an error happens while handling the event, propagate GDB's | |
3677 | knowledge of the executing state to the frontend/user running | |
3678 | state. */ | |
3e43a32a MS |
3679 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, |
3680 | &minus_one_ptid); | |
24291992 PA |
3681 | |
3682 | /* Now figure out what to do with the result of the result. */ | |
3683 | handle_inferior_event (ecs); | |
3684 | ||
3685 | /* No error, don't finish the state yet. */ | |
3686 | discard_cleanups (old_chain_2); | |
3687 | ||
3688 | /* Breakpoints and watchpoints are not installed on the target | |
3689 | at this point, and signals are passed directly to the | |
3690 | inferior, so this must mean the process is gone. */ | |
3691 | if (!ecs->wait_some_more) | |
3692 | { | |
9bcb1f16 | 3693 | restore_detaching.release (); |
24291992 PA |
3694 | error (_("Program exited while detaching")); |
3695 | } | |
3696 | } | |
3697 | ||
9bcb1f16 | 3698 | restore_detaching.release (); |
24291992 PA |
3699 | } |
3700 | ||
cd0fc7c3 | 3701 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3702 | |
cd0fc7c3 SS |
3703 | If inferior gets a signal, we may decide to start it up again |
3704 | instead of returning. That is why there is a loop in this function. | |
3705 | When this function actually returns it means the inferior | |
3706 | should be left stopped and GDB should read more commands. */ | |
3707 | ||
3708 | void | |
e4c8541f | 3709 | wait_for_inferior (void) |
cd0fc7c3 SS |
3710 | { |
3711 | struct cleanup *old_cleanups; | |
e6f5c25b | 3712 | struct cleanup *thread_state_chain; |
c906108c | 3713 | |
527159b7 | 3714 | if (debug_infrun) |
ae123ec6 | 3715 | fprintf_unfiltered |
e4c8541f | 3716 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3717 | |
0cbcdb96 PA |
3718 | old_cleanups |
3719 | = make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, | |
3720 | NULL); | |
cd0fc7c3 | 3721 | |
e6f5c25b PA |
3722 | /* If an error happens while handling the event, propagate GDB's |
3723 | knowledge of the executing state to the frontend/user running | |
3724 | state. */ | |
3725 | thread_state_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
3726 | ||
c906108c SS |
3727 | while (1) |
3728 | { | |
ae25568b PA |
3729 | struct execution_control_state ecss; |
3730 | struct execution_control_state *ecs = &ecss; | |
963f9c80 | 3731 | ptid_t waiton_ptid = minus_one_ptid; |
29f49a6a | 3732 | |
ae25568b PA |
3733 | memset (ecs, 0, sizeof (*ecs)); |
3734 | ||
ec9499be | 3735 | overlay_cache_invalid = 1; |
ec9499be | 3736 | |
f15cb84a YQ |
3737 | /* Flush target cache before starting to handle each event. |
3738 | Target was running and cache could be stale. This is just a | |
3739 | heuristic. Running threads may modify target memory, but we | |
3740 | don't get any event. */ | |
3741 | target_dcache_invalidate (); | |
3742 | ||
372316f1 | 3743 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 3744 | |
f00150c9 | 3745 | if (debug_infrun) |
223698f8 | 3746 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3747 | |
cd0fc7c3 SS |
3748 | /* Now figure out what to do with the result of the result. */ |
3749 | handle_inferior_event (ecs); | |
c906108c | 3750 | |
cd0fc7c3 SS |
3751 | if (!ecs->wait_some_more) |
3752 | break; | |
3753 | } | |
4e1c45ea | 3754 | |
e6f5c25b PA |
3755 | /* No error, don't finish the state yet. */ |
3756 | discard_cleanups (thread_state_chain); | |
3757 | ||
cd0fc7c3 SS |
3758 | do_cleanups (old_cleanups); |
3759 | } | |
c906108c | 3760 | |
d3d4baed PA |
3761 | /* Cleanup that reinstalls the readline callback handler, if the |
3762 | target is running in the background. If while handling the target | |
3763 | event something triggered a secondary prompt, like e.g., a | |
3764 | pagination prompt, we'll have removed the callback handler (see | |
3765 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3766 | event loop, ready to process further input. Note this has no | |
3767 | effect if the handler hasn't actually been removed, because calling | |
3768 | rl_callback_handler_install resets the line buffer, thus losing | |
3769 | input. */ | |
3770 | ||
3771 | static void | |
3772 | reinstall_readline_callback_handler_cleanup (void *arg) | |
3773 | { | |
3b12939d PA |
3774 | struct ui *ui = current_ui; |
3775 | ||
3776 | if (!ui->async) | |
6c400b59 PA |
3777 | { |
3778 | /* We're not going back to the top level event loop yet. Don't | |
3779 | install the readline callback, as it'd prep the terminal, | |
3780 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3781 | it the next time the prompt is displayed, when we're ready | |
3782 | for input. */ | |
3783 | return; | |
3784 | } | |
3785 | ||
3b12939d | 3786 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3787 | gdb_rl_callback_handler_reinstall (); |
3788 | } | |
3789 | ||
243a9253 PA |
3790 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3791 | that's just the event thread. In all-stop, that's all threads. */ | |
3792 | ||
3793 | static void | |
3794 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3795 | { | |
3796 | struct thread_info *thr = ecs->event_thread; | |
3797 | ||
3798 | if (thr != NULL && thr->thread_fsm != NULL) | |
8980e177 | 3799 | thread_fsm_clean_up (thr->thread_fsm, thr); |
243a9253 PA |
3800 | |
3801 | if (!non_stop) | |
3802 | { | |
3803 | ALL_NON_EXITED_THREADS (thr) | |
3804 | { | |
3805 | if (thr->thread_fsm == NULL) | |
3806 | continue; | |
3807 | if (thr == ecs->event_thread) | |
3808 | continue; | |
3809 | ||
3810 | switch_to_thread (thr->ptid); | |
8980e177 | 3811 | thread_fsm_clean_up (thr->thread_fsm, thr); |
243a9253 PA |
3812 | } |
3813 | ||
3814 | if (ecs->event_thread != NULL) | |
3815 | switch_to_thread (ecs->event_thread->ptid); | |
3816 | } | |
3817 | } | |
3818 | ||
3b12939d PA |
3819 | /* Helper for all_uis_check_sync_execution_done that works on the |
3820 | current UI. */ | |
3821 | ||
3822 | static void | |
3823 | check_curr_ui_sync_execution_done (void) | |
3824 | { | |
3825 | struct ui *ui = current_ui; | |
3826 | ||
3827 | if (ui->prompt_state == PROMPT_NEEDED | |
3828 | && ui->async | |
3829 | && !gdb_in_secondary_prompt_p (ui)) | |
3830 | { | |
3831 | target_terminal_ours (); | |
3832 | observer_notify_sync_execution_done (); | |
3eb7562a | 3833 | ui_register_input_event_handler (ui); |
3b12939d PA |
3834 | } |
3835 | } | |
3836 | ||
3837 | /* See infrun.h. */ | |
3838 | ||
3839 | void | |
3840 | all_uis_check_sync_execution_done (void) | |
3841 | { | |
0e454242 | 3842 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3843 | { |
3844 | check_curr_ui_sync_execution_done (); | |
3845 | } | |
3846 | } | |
3847 | ||
a8836c93 PA |
3848 | /* See infrun.h. */ |
3849 | ||
3850 | void | |
3851 | all_uis_on_sync_execution_starting (void) | |
3852 | { | |
0e454242 | 3853 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3854 | { |
3855 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3856 | async_disable_stdin (); | |
3857 | } | |
3858 | } | |
3859 | ||
1777feb0 | 3860 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3861 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3862 | descriptor corresponding to the target. It can be called more than |
3863 | once to complete a single execution command. In such cases we need | |
3864 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3865 | that this function is called for a single execution command, then |
3866 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3867 | necessary cleanups. */ |
43ff13b4 JM |
3868 | |
3869 | void | |
fba45db2 | 3870 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3871 | { |
0d1e5fa7 | 3872 | struct execution_control_state ecss; |
a474d7c2 | 3873 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 3874 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 3875 | struct cleanup *ts_old_chain; |
0f641c01 | 3876 | int cmd_done = 0; |
963f9c80 | 3877 | ptid_t waiton_ptid = minus_one_ptid; |
43ff13b4 | 3878 | |
0d1e5fa7 PA |
3879 | memset (ecs, 0, sizeof (*ecs)); |
3880 | ||
c61db772 PA |
3881 | /* Events are always processed with the main UI as current UI. This |
3882 | way, warnings, debug output, etc. are always consistently sent to | |
3883 | the main console. */ | |
4b6749b9 | 3884 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3885 | |
d3d4baed PA |
3886 | /* End up with readline processing input, if necessary. */ |
3887 | make_cleanup (reinstall_readline_callback_handler_cleanup, NULL); | |
3888 | ||
c5187ac6 PA |
3889 | /* We're handling a live event, so make sure we're doing live |
3890 | debugging. If we're looking at traceframes while the target is | |
3891 | running, we're going to need to get back to that mode after | |
3892 | handling the event. */ | |
3893 | if (non_stop) | |
3894 | { | |
3895 | make_cleanup_restore_current_traceframe (); | |
e6e4e701 | 3896 | set_current_traceframe (-1); |
c5187ac6 PA |
3897 | } |
3898 | ||
5ed8105e PA |
3899 | gdb::optional<scoped_restore_current_thread> maybe_restore_thread; |
3900 | ||
4f8d22e3 PA |
3901 | if (non_stop) |
3902 | /* In non-stop mode, the user/frontend should not notice a thread | |
3903 | switch due to internal events. Make sure we reverse to the | |
3904 | user selected thread and frame after handling the event and | |
3905 | running any breakpoint commands. */ | |
5ed8105e | 3906 | maybe_restore_thread.emplace (); |
4f8d22e3 | 3907 | |
ec9499be | 3908 | overlay_cache_invalid = 1; |
f15cb84a YQ |
3909 | /* Flush target cache before starting to handle each event. Target |
3910 | was running and cache could be stale. This is just a heuristic. | |
3911 | Running threads may modify target memory, but we don't get any | |
3912 | event. */ | |
3913 | target_dcache_invalidate (); | |
3dd5b83d | 3914 | |
b7b633e9 TT |
3915 | scoped_restore save_exec_dir |
3916 | = make_scoped_restore (&execution_direction, target_execution_direction ()); | |
32231432 | 3917 | |
0b333c5e PA |
3918 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, |
3919 | target_can_async_p () ? TARGET_WNOHANG : 0); | |
43ff13b4 | 3920 | |
f00150c9 | 3921 | if (debug_infrun) |
223698f8 | 3922 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3923 | |
29f49a6a PA |
3924 | /* If an error happens while handling the event, propagate GDB's |
3925 | knowledge of the executing state to the frontend/user running | |
3926 | state. */ | |
fbea99ea | 3927 | if (!target_is_non_stop_p ()) |
29f49a6a PA |
3928 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); |
3929 | else | |
3930 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
3931 | ||
353d1d73 JK |
3932 | /* Get executed before make_cleanup_restore_current_thread above to apply |
3933 | still for the thread which has thrown the exception. */ | |
3934 | make_bpstat_clear_actions_cleanup (); | |
3935 | ||
7c16b83e PA |
3936 | make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, NULL); |
3937 | ||
43ff13b4 | 3938 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 3939 | handle_inferior_event (ecs); |
43ff13b4 | 3940 | |
a474d7c2 | 3941 | if (!ecs->wait_some_more) |
43ff13b4 | 3942 | { |
c9657e70 | 3943 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
243a9253 PA |
3944 | int should_stop = 1; |
3945 | struct thread_info *thr = ecs->event_thread; | |
388a7084 | 3946 | int should_notify_stop = 1; |
d6b48e9c | 3947 | |
0cbcdb96 | 3948 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3949 | |
243a9253 PA |
3950 | if (thr != NULL) |
3951 | { | |
3952 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
3953 | ||
3954 | if (thread_fsm != NULL) | |
8980e177 | 3955 | should_stop = thread_fsm_should_stop (thread_fsm, thr); |
243a9253 PA |
3956 | } |
3957 | ||
3958 | if (!should_stop) | |
3959 | { | |
3960 | keep_going (ecs); | |
3961 | } | |
c2d11a7d | 3962 | else |
0f641c01 | 3963 | { |
243a9253 PA |
3964 | clean_up_just_stopped_threads_fsms (ecs); |
3965 | ||
388a7084 PA |
3966 | if (thr != NULL && thr->thread_fsm != NULL) |
3967 | { | |
3968 | should_notify_stop | |
3969 | = thread_fsm_should_notify_stop (thr->thread_fsm); | |
3970 | } | |
3971 | ||
3972 | if (should_notify_stop) | |
3973 | { | |
4c2f2a79 PA |
3974 | int proceeded = 0; |
3975 | ||
388a7084 PA |
3976 | /* We may not find an inferior if this was a process exit. */ |
3977 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
4c2f2a79 | 3978 | proceeded = normal_stop (); |
243a9253 | 3979 | |
4c2f2a79 PA |
3980 | if (!proceeded) |
3981 | { | |
3982 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
3983 | cmd_done = 1; | |
3984 | } | |
388a7084 | 3985 | } |
0f641c01 | 3986 | } |
43ff13b4 | 3987 | } |
4f8d22e3 | 3988 | |
29f49a6a PA |
3989 | /* No error, don't finish the thread states yet. */ |
3990 | discard_cleanups (ts_old_chain); | |
3991 | ||
4f8d22e3 PA |
3992 | /* Revert thread and frame. */ |
3993 | do_cleanups (old_chain); | |
3994 | ||
3b12939d PA |
3995 | /* If a UI was in sync execution mode, and now isn't, restore its |
3996 | prompt (a synchronous execution command has finished, and we're | |
3997 | ready for input). */ | |
3998 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
3999 | |
4000 | if (cmd_done | |
0f641c01 PA |
4001 | && exec_done_display_p |
4002 | && (ptid_equal (inferior_ptid, null_ptid) | |
4003 | || !is_running (inferior_ptid))) | |
4004 | printf_unfiltered (_("completed.\n")); | |
43ff13b4 JM |
4005 | } |
4006 | ||
edb3359d DJ |
4007 | /* Record the frame and location we're currently stepping through. */ |
4008 | void | |
4009 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
4010 | { | |
4011 | struct thread_info *tp = inferior_thread (); | |
4012 | ||
16c381f0 JK |
4013 | tp->control.step_frame_id = get_frame_id (frame); |
4014 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4015 | |
4016 | tp->current_symtab = sal.symtab; | |
4017 | tp->current_line = sal.line; | |
4018 | } | |
4019 | ||
0d1e5fa7 PA |
4020 | /* Clear context switchable stepping state. */ |
4021 | ||
4022 | void | |
4e1c45ea | 4023 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4024 | { |
7f5ef605 | 4025 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4026 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4027 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4028 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4029 | } |
4030 | ||
c32c64b7 DE |
4031 | /* Set the cached copy of the last ptid/waitstatus. */ |
4032 | ||
6efcd9a8 | 4033 | void |
c32c64b7 DE |
4034 | set_last_target_status (ptid_t ptid, struct target_waitstatus status) |
4035 | { | |
4036 | target_last_wait_ptid = ptid; | |
4037 | target_last_waitstatus = status; | |
4038 | } | |
4039 | ||
e02bc4cc | 4040 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
4041 | target_wait()/deprecated_target_wait_hook(). The data is actually |
4042 | cached by handle_inferior_event(), which gets called immediately | |
4043 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
4044 | |
4045 | void | |
488f131b | 4046 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 4047 | { |
39f77062 | 4048 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
4049 | *status = target_last_waitstatus; |
4050 | } | |
4051 | ||
ac264b3b MS |
4052 | void |
4053 | nullify_last_target_wait_ptid (void) | |
4054 | { | |
4055 | target_last_wait_ptid = minus_one_ptid; | |
4056 | } | |
4057 | ||
dcf4fbde | 4058 | /* Switch thread contexts. */ |
dd80620e MS |
4059 | |
4060 | static void | |
0d1e5fa7 | 4061 | context_switch (ptid_t ptid) |
dd80620e | 4062 | { |
4b51d87b | 4063 | if (debug_infrun && !ptid_equal (ptid, inferior_ptid)) |
fd48f117 DJ |
4064 | { |
4065 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
4066 | target_pid_to_str (inferior_ptid)); | |
4067 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 4068 | target_pid_to_str (ptid)); |
fd48f117 DJ |
4069 | } |
4070 | ||
0d1e5fa7 | 4071 | switch_to_thread (ptid); |
dd80620e MS |
4072 | } |
4073 | ||
d8dd4d5f PA |
4074 | /* If the target can't tell whether we've hit breakpoints |
4075 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4076 | check whether that could have been caused by a breakpoint. If so, | |
4077 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4078 | ||
4fa8626c | 4079 | static void |
d8dd4d5f PA |
4080 | adjust_pc_after_break (struct thread_info *thread, |
4081 | struct target_waitstatus *ws) | |
4fa8626c | 4082 | { |
24a73cce UW |
4083 | struct regcache *regcache; |
4084 | struct gdbarch *gdbarch; | |
6c95b8df | 4085 | struct address_space *aspace; |
118e6252 | 4086 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4087 | |
4fa8626c DJ |
4088 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4089 | we aren't, just return. | |
9709f61c DJ |
4090 | |
4091 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4092 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4093 | implemented by software breakpoints should be handled through the normal | |
4094 | breakpoint layer. | |
8fb3e588 | 4095 | |
4fa8626c DJ |
4096 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4097 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4098 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4099 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4100 | generates these signals at breakpoints (the code has been in GDB since at | |
4101 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4102 | |
e6cf7916 UW |
4103 | In earlier versions of GDB, a target with |
4104 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4105 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4106 | target with both of these set in GDB history, and it seems unlikely to be | |
4107 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4108 | |
d8dd4d5f | 4109 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4110 | return; |
4111 | ||
d8dd4d5f | 4112 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4113 | return; |
4114 | ||
4058b839 PA |
4115 | /* In reverse execution, when a breakpoint is hit, the instruction |
4116 | under it has already been de-executed. The reported PC always | |
4117 | points at the breakpoint address, so adjusting it further would | |
4118 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4119 | architecture: | |
4120 | ||
4121 | B1 0x08000000 : INSN1 | |
4122 | B2 0x08000001 : INSN2 | |
4123 | 0x08000002 : INSN3 | |
4124 | PC -> 0x08000003 : INSN4 | |
4125 | ||
4126 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4127 | from that point should hit B2 as below. Reading the PC when the | |
4128 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4129 | been de-executed already. | |
4130 | ||
4131 | B1 0x08000000 : INSN1 | |
4132 | B2 PC -> 0x08000001 : INSN2 | |
4133 | 0x08000002 : INSN3 | |
4134 | 0x08000003 : INSN4 | |
4135 | ||
4136 | We can't apply the same logic as for forward execution, because | |
4137 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4138 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4139 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4140 | behaviour. */ | |
4141 | if (execution_direction == EXEC_REVERSE) | |
4142 | return; | |
4143 | ||
1cf4d951 PA |
4144 | /* If the target can tell whether the thread hit a SW breakpoint, |
4145 | trust it. Targets that can tell also adjust the PC | |
4146 | themselves. */ | |
4147 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4148 | return; | |
4149 | ||
4150 | /* Note that relying on whether a breakpoint is planted in memory to | |
4151 | determine this can fail. E.g,. the breakpoint could have been | |
4152 | removed since. Or the thread could have been told to step an | |
4153 | instruction the size of a breakpoint instruction, and only | |
4154 | _after_ was a breakpoint inserted at its address. */ | |
4155 | ||
24a73cce UW |
4156 | /* If this target does not decrement the PC after breakpoints, then |
4157 | we have nothing to do. */ | |
d8dd4d5f | 4158 | regcache = get_thread_regcache (thread->ptid); |
24a73cce | 4159 | gdbarch = get_regcache_arch (regcache); |
118e6252 | 4160 | |
527a273a | 4161 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4162 | if (decr_pc == 0) |
24a73cce UW |
4163 | return; |
4164 | ||
6c95b8df PA |
4165 | aspace = get_regcache_aspace (regcache); |
4166 | ||
8aad930b AC |
4167 | /* Find the location where (if we've hit a breakpoint) the |
4168 | breakpoint would be. */ | |
118e6252 | 4169 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4170 | |
1cf4d951 PA |
4171 | /* If the target can't tell whether a software breakpoint triggered, |
4172 | fallback to figuring it out based on breakpoints we think were | |
4173 | inserted in the target, and on whether the thread was stepped or | |
4174 | continued. */ | |
4175 | ||
1c5cfe86 PA |
4176 | /* Check whether there actually is a software breakpoint inserted at |
4177 | that location. | |
4178 | ||
4179 | If in non-stop mode, a race condition is possible where we've | |
4180 | removed a breakpoint, but stop events for that breakpoint were | |
4181 | already queued and arrive later. To suppress those spurious | |
4182 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4183 | and retire them after a number of stop events are reported. Note |
4184 | this is an heuristic and can thus get confused. The real fix is | |
4185 | to get the "stopped by SW BP and needs adjustment" info out of | |
4186 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4187 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4188 | || (target_is_non_stop_p () |
4189 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4190 | { |
77f9e713 | 4191 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); |
abbb1732 | 4192 | |
8213266a | 4193 | if (record_full_is_used ()) |
77f9e713 | 4194 | record_full_gdb_operation_disable_set (); |
96429cc8 | 4195 | |
1c0fdd0e UW |
4196 | /* When using hardware single-step, a SIGTRAP is reported for both |
4197 | a completed single-step and a software breakpoint. Need to | |
4198 | differentiate between the two, as the latter needs adjusting | |
4199 | but the former does not. | |
4200 | ||
4201 | The SIGTRAP can be due to a completed hardware single-step only if | |
4202 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4203 | - this thread is currently being stepped |
4204 | ||
4205 | If any of these events did not occur, we must have stopped due | |
4206 | to hitting a software breakpoint, and have to back up to the | |
4207 | breakpoint address. | |
4208 | ||
4209 | As a special case, we could have hardware single-stepped a | |
4210 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4211 | we also need to back up to the breakpoint address. */ | |
4212 | ||
d8dd4d5f PA |
4213 | if (thread_has_single_step_breakpoints_set (thread) |
4214 | || !currently_stepping (thread) | |
4215 | || (thread->stepped_breakpoint | |
4216 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4217 | regcache_write_pc (regcache, breakpoint_pc); |
96429cc8 | 4218 | |
77f9e713 | 4219 | do_cleanups (old_cleanups); |
8aad930b | 4220 | } |
4fa8626c DJ |
4221 | } |
4222 | ||
edb3359d DJ |
4223 | static int |
4224 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4225 | { | |
4226 | for (frame = get_prev_frame (frame); | |
4227 | frame != NULL; | |
4228 | frame = get_prev_frame (frame)) | |
4229 | { | |
4230 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4231 | return 1; | |
4232 | if (get_frame_type (frame) != INLINE_FRAME) | |
4233 | break; | |
4234 | } | |
4235 | ||
4236 | return 0; | |
4237 | } | |
4238 | ||
c65d6b55 PA |
4239 | /* If the event thread has the stop requested flag set, pretend it |
4240 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4241 | target_stop). */ | |
4242 | ||
4243 | static bool | |
4244 | handle_stop_requested (struct execution_control_state *ecs) | |
4245 | { | |
4246 | if (ecs->event_thread->stop_requested) | |
4247 | { | |
4248 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4249 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4250 | handle_signal_stop (ecs); | |
4251 | return true; | |
4252 | } | |
4253 | return false; | |
4254 | } | |
4255 | ||
a96d9b2e SDJ |
4256 | /* Auxiliary function that handles syscall entry/return events. |
4257 | It returns 1 if the inferior should keep going (and GDB | |
4258 | should ignore the event), or 0 if the event deserves to be | |
4259 | processed. */ | |
ca2163eb | 4260 | |
a96d9b2e | 4261 | static int |
ca2163eb | 4262 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4263 | { |
ca2163eb | 4264 | struct regcache *regcache; |
ca2163eb PA |
4265 | int syscall_number; |
4266 | ||
4267 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
4268 | context_switch (ecs->ptid); | |
4269 | ||
4270 | regcache = get_thread_regcache (ecs->ptid); | |
f90263c1 | 4271 | syscall_number = ecs->ws.value.syscall_number; |
ca2163eb PA |
4272 | stop_pc = regcache_read_pc (regcache); |
4273 | ||
a96d9b2e SDJ |
4274 | if (catch_syscall_enabled () > 0 |
4275 | && catching_syscall_number (syscall_number) > 0) | |
4276 | { | |
4277 | if (debug_infrun) | |
4278 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
4279 | syscall_number); | |
a96d9b2e | 4280 | |
16c381f0 | 4281 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4282 | = bpstat_stop_status (get_regcache_aspace (regcache), |
09ac7c10 | 4283 | stop_pc, ecs->ptid, &ecs->ws); |
ab04a2af | 4284 | |
c65d6b55 PA |
4285 | if (handle_stop_requested (ecs)) |
4286 | return 0; | |
4287 | ||
ce12b012 | 4288 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4289 | { |
4290 | /* Catchpoint hit. */ | |
ca2163eb PA |
4291 | return 0; |
4292 | } | |
a96d9b2e | 4293 | } |
ca2163eb | 4294 | |
c65d6b55 PA |
4295 | if (handle_stop_requested (ecs)) |
4296 | return 0; | |
4297 | ||
ca2163eb | 4298 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb PA |
4299 | keep_going (ecs); |
4300 | return 1; | |
a96d9b2e SDJ |
4301 | } |
4302 | ||
7e324e48 GB |
4303 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4304 | ||
4305 | static void | |
4306 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4307 | struct execution_control_state *ecs) | |
4308 | { | |
4309 | if (!ecs->stop_func_filled_in) | |
4310 | { | |
4311 | /* Don't care about return value; stop_func_start and stop_func_name | |
4312 | will both be 0 if it doesn't work. */ | |
4313 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
4314 | &ecs->stop_func_start, &ecs->stop_func_end); | |
4315 | ecs->stop_func_start | |
4316 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4317 | ||
591a12a1 UW |
4318 | if (gdbarch_skip_entrypoint_p (gdbarch)) |
4319 | ecs->stop_func_start = gdbarch_skip_entrypoint (gdbarch, | |
4320 | ecs->stop_func_start); | |
4321 | ||
7e324e48 GB |
4322 | ecs->stop_func_filled_in = 1; |
4323 | } | |
4324 | } | |
4325 | ||
4f5d7f63 PA |
4326 | |
4327 | /* Return the STOP_SOON field of the inferior pointed at by PTID. */ | |
4328 | ||
4329 | static enum stop_kind | |
4330 | get_inferior_stop_soon (ptid_t ptid) | |
4331 | { | |
c9657e70 | 4332 | struct inferior *inf = find_inferior_ptid (ptid); |
4f5d7f63 PA |
4333 | |
4334 | gdb_assert (inf != NULL); | |
4335 | return inf->control.stop_soon; | |
4336 | } | |
4337 | ||
372316f1 PA |
4338 | /* Wait for one event. Store the resulting waitstatus in WS, and |
4339 | return the event ptid. */ | |
4340 | ||
4341 | static ptid_t | |
4342 | wait_one (struct target_waitstatus *ws) | |
4343 | { | |
4344 | ptid_t event_ptid; | |
4345 | ptid_t wait_ptid = minus_one_ptid; | |
4346 | ||
4347 | overlay_cache_invalid = 1; | |
4348 | ||
4349 | /* Flush target cache before starting to handle each event. | |
4350 | Target was running and cache could be stale. This is just a | |
4351 | heuristic. Running threads may modify target memory, but we | |
4352 | don't get any event. */ | |
4353 | target_dcache_invalidate (); | |
4354 | ||
4355 | if (deprecated_target_wait_hook) | |
4356 | event_ptid = deprecated_target_wait_hook (wait_ptid, ws, 0); | |
4357 | else | |
4358 | event_ptid = target_wait (wait_ptid, ws, 0); | |
4359 | ||
4360 | if (debug_infrun) | |
4361 | print_target_wait_results (wait_ptid, event_ptid, ws); | |
4362 | ||
4363 | return event_ptid; | |
4364 | } | |
4365 | ||
4366 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID | |
4367 | instead of the current thread. */ | |
4368 | #define THREAD_STOPPED_BY(REASON) \ | |
4369 | static int \ | |
4370 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4371 | { \ | |
4372 | struct cleanup *old_chain; \ | |
4373 | int res; \ | |
4374 | \ | |
4375 | old_chain = save_inferior_ptid (); \ | |
4376 | inferior_ptid = ptid; \ | |
4377 | \ | |
4378 | res = target_stopped_by_ ## REASON (); \ | |
4379 | \ | |
4380 | do_cleanups (old_chain); \ | |
4381 | \ | |
4382 | return res; \ | |
4383 | } | |
4384 | ||
4385 | /* Generate thread_stopped_by_watchpoint. */ | |
4386 | THREAD_STOPPED_BY (watchpoint) | |
4387 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4388 | THREAD_STOPPED_BY (sw_breakpoint) | |
4389 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4390 | THREAD_STOPPED_BY (hw_breakpoint) | |
4391 | ||
4392 | /* Cleanups that switches to the PTID pointed at by PTID_P. */ | |
4393 | ||
4394 | static void | |
4395 | switch_to_thread_cleanup (void *ptid_p) | |
4396 | { | |
4397 | ptid_t ptid = *(ptid_t *) ptid_p; | |
4398 | ||
4399 | switch_to_thread (ptid); | |
4400 | } | |
4401 | ||
4402 | /* Save the thread's event and stop reason to process it later. */ | |
4403 | ||
4404 | static void | |
4405 | save_waitstatus (struct thread_info *tp, struct target_waitstatus *ws) | |
4406 | { | |
4407 | struct regcache *regcache; | |
4408 | struct address_space *aspace; | |
4409 | ||
4410 | if (debug_infrun) | |
4411 | { | |
4412 | char *statstr; | |
4413 | ||
4414 | statstr = target_waitstatus_to_string (ws); | |
4415 | fprintf_unfiltered (gdb_stdlog, | |
4416 | "infrun: saving status %s for %d.%ld.%ld\n", | |
4417 | statstr, | |
4418 | ptid_get_pid (tp->ptid), | |
4419 | ptid_get_lwp (tp->ptid), | |
4420 | ptid_get_tid (tp->ptid)); | |
4421 | xfree (statstr); | |
4422 | } | |
4423 | ||
4424 | /* Record for later. */ | |
4425 | tp->suspend.waitstatus = *ws; | |
4426 | tp->suspend.waitstatus_pending_p = 1; | |
4427 | ||
4428 | regcache = get_thread_regcache (tp->ptid); | |
4429 | aspace = get_regcache_aspace (regcache); | |
4430 | ||
4431 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4432 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4433 | { | |
4434 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4435 | ||
4436 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4437 | ||
4438 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4439 | { | |
4440 | tp->suspend.stop_reason | |
4441 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4442 | } | |
4443 | else if (target_supports_stopped_by_sw_breakpoint () | |
4444 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4445 | { | |
4446 | tp->suspend.stop_reason | |
4447 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4448 | } | |
4449 | else if (target_supports_stopped_by_hw_breakpoint () | |
4450 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4451 | { | |
4452 | tp->suspend.stop_reason | |
4453 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4454 | } | |
4455 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4456 | && hardware_breakpoint_inserted_here_p (aspace, | |
4457 | pc)) | |
4458 | { | |
4459 | tp->suspend.stop_reason | |
4460 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4461 | } | |
4462 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4463 | && software_breakpoint_inserted_here_p (aspace, | |
4464 | pc)) | |
4465 | { | |
4466 | tp->suspend.stop_reason | |
4467 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4468 | } | |
4469 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4470 | && currently_stepping (tp)) | |
4471 | { | |
4472 | tp->suspend.stop_reason | |
4473 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4474 | } | |
4475 | } | |
4476 | } | |
4477 | ||
65706a29 PA |
4478 | /* A cleanup that disables thread create/exit events. */ |
4479 | ||
4480 | static void | |
4481 | disable_thread_events (void *arg) | |
4482 | { | |
4483 | target_thread_events (0); | |
4484 | } | |
4485 | ||
6efcd9a8 | 4486 | /* See infrun.h. */ |
372316f1 | 4487 | |
6efcd9a8 | 4488 | void |
372316f1 PA |
4489 | stop_all_threads (void) |
4490 | { | |
4491 | /* We may need multiple passes to discover all threads. */ | |
4492 | int pass; | |
4493 | int iterations = 0; | |
4494 | ptid_t entry_ptid; | |
4495 | struct cleanup *old_chain; | |
4496 | ||
fbea99ea | 4497 | gdb_assert (target_is_non_stop_p ()); |
372316f1 PA |
4498 | |
4499 | if (debug_infrun) | |
4500 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n"); | |
4501 | ||
4502 | entry_ptid = inferior_ptid; | |
4503 | old_chain = make_cleanup (switch_to_thread_cleanup, &entry_ptid); | |
4504 | ||
65706a29 PA |
4505 | target_thread_events (1); |
4506 | make_cleanup (disable_thread_events, NULL); | |
4507 | ||
372316f1 PA |
4508 | /* Request threads to stop, and then wait for the stops. Because |
4509 | threads we already know about can spawn more threads while we're | |
4510 | trying to stop them, and we only learn about new threads when we | |
4511 | update the thread list, do this in a loop, and keep iterating | |
4512 | until two passes find no threads that need to be stopped. */ | |
4513 | for (pass = 0; pass < 2; pass++, iterations++) | |
4514 | { | |
4515 | if (debug_infrun) | |
4516 | fprintf_unfiltered (gdb_stdlog, | |
4517 | "infrun: stop_all_threads, pass=%d, " | |
4518 | "iterations=%d\n", pass, iterations); | |
4519 | while (1) | |
4520 | { | |
4521 | ptid_t event_ptid; | |
4522 | struct target_waitstatus ws; | |
4523 | int need_wait = 0; | |
4524 | struct thread_info *t; | |
4525 | ||
4526 | update_thread_list (); | |
4527 | ||
4528 | /* Go through all threads looking for threads that we need | |
4529 | to tell the target to stop. */ | |
4530 | ALL_NON_EXITED_THREADS (t) | |
4531 | { | |
4532 | if (t->executing) | |
4533 | { | |
4534 | /* If already stopping, don't request a stop again. | |
4535 | We just haven't seen the notification yet. */ | |
4536 | if (!t->stop_requested) | |
4537 | { | |
4538 | if (debug_infrun) | |
4539 | fprintf_unfiltered (gdb_stdlog, | |
4540 | "infrun: %s executing, " | |
4541 | "need stop\n", | |
4542 | target_pid_to_str (t->ptid)); | |
4543 | target_stop (t->ptid); | |
4544 | t->stop_requested = 1; | |
4545 | } | |
4546 | else | |
4547 | { | |
4548 | if (debug_infrun) | |
4549 | fprintf_unfiltered (gdb_stdlog, | |
4550 | "infrun: %s executing, " | |
4551 | "already stopping\n", | |
4552 | target_pid_to_str (t->ptid)); | |
4553 | } | |
4554 | ||
4555 | if (t->stop_requested) | |
4556 | need_wait = 1; | |
4557 | } | |
4558 | else | |
4559 | { | |
4560 | if (debug_infrun) | |
4561 | fprintf_unfiltered (gdb_stdlog, | |
4562 | "infrun: %s not executing\n", | |
4563 | target_pid_to_str (t->ptid)); | |
4564 | ||
4565 | /* The thread may be not executing, but still be | |
4566 | resumed with a pending status to process. */ | |
4567 | t->resumed = 0; | |
4568 | } | |
4569 | } | |
4570 | ||
4571 | if (!need_wait) | |
4572 | break; | |
4573 | ||
4574 | /* If we find new threads on the second iteration, restart | |
4575 | over. We want to see two iterations in a row with all | |
4576 | threads stopped. */ | |
4577 | if (pass > 0) | |
4578 | pass = -1; | |
4579 | ||
4580 | event_ptid = wait_one (&ws); | |
4581 | if (ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4582 | { | |
4583 | /* All resumed threads exited. */ | |
4584 | } | |
65706a29 PA |
4585 | else if (ws.kind == TARGET_WAITKIND_THREAD_EXITED |
4586 | || ws.kind == TARGET_WAITKIND_EXITED | |
372316f1 PA |
4587 | || ws.kind == TARGET_WAITKIND_SIGNALLED) |
4588 | { | |
4589 | if (debug_infrun) | |
4590 | { | |
4591 | ptid_t ptid = pid_to_ptid (ws.value.integer); | |
4592 | ||
4593 | fprintf_unfiltered (gdb_stdlog, | |
4594 | "infrun: %s exited while " | |
4595 | "stopping threads\n", | |
4596 | target_pid_to_str (ptid)); | |
4597 | } | |
4598 | } | |
4599 | else | |
4600 | { | |
6efcd9a8 PA |
4601 | struct inferior *inf; |
4602 | ||
372316f1 PA |
4603 | t = find_thread_ptid (event_ptid); |
4604 | if (t == NULL) | |
4605 | t = add_thread (event_ptid); | |
4606 | ||
4607 | t->stop_requested = 0; | |
4608 | t->executing = 0; | |
4609 | t->resumed = 0; | |
4610 | t->control.may_range_step = 0; | |
4611 | ||
6efcd9a8 PA |
4612 | /* This may be the first time we see the inferior report |
4613 | a stop. */ | |
4614 | inf = find_inferior_ptid (event_ptid); | |
4615 | if (inf->needs_setup) | |
4616 | { | |
4617 | switch_to_thread_no_regs (t); | |
4618 | setup_inferior (0); | |
4619 | } | |
4620 | ||
372316f1 PA |
4621 | if (ws.kind == TARGET_WAITKIND_STOPPED |
4622 | && ws.value.sig == GDB_SIGNAL_0) | |
4623 | { | |
4624 | /* We caught the event that we intended to catch, so | |
4625 | there's no event pending. */ | |
4626 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4627 | t->suspend.waitstatus_pending_p = 0; | |
4628 | ||
4629 | if (displaced_step_fixup (t->ptid, GDB_SIGNAL_0) < 0) | |
4630 | { | |
4631 | /* Add it back to the step-over queue. */ | |
4632 | if (debug_infrun) | |
4633 | { | |
4634 | fprintf_unfiltered (gdb_stdlog, | |
4635 | "infrun: displaced-step of %s " | |
4636 | "canceled: adding back to the " | |
4637 | "step-over queue\n", | |
4638 | target_pid_to_str (t->ptid)); | |
4639 | } | |
4640 | t->control.trap_expected = 0; | |
4641 | thread_step_over_chain_enqueue (t); | |
4642 | } | |
4643 | } | |
4644 | else | |
4645 | { | |
4646 | enum gdb_signal sig; | |
4647 | struct regcache *regcache; | |
372316f1 PA |
4648 | |
4649 | if (debug_infrun) | |
4650 | { | |
4651 | char *statstr; | |
4652 | ||
4653 | statstr = target_waitstatus_to_string (&ws); | |
4654 | fprintf_unfiltered (gdb_stdlog, | |
4655 | "infrun: target_wait %s, saving " | |
4656 | "status for %d.%ld.%ld\n", | |
4657 | statstr, | |
4658 | ptid_get_pid (t->ptid), | |
4659 | ptid_get_lwp (t->ptid), | |
4660 | ptid_get_tid (t->ptid)); | |
4661 | xfree (statstr); | |
4662 | } | |
4663 | ||
4664 | /* Record for later. */ | |
4665 | save_waitstatus (t, &ws); | |
4666 | ||
4667 | sig = (ws.kind == TARGET_WAITKIND_STOPPED | |
4668 | ? ws.value.sig : GDB_SIGNAL_0); | |
4669 | ||
4670 | if (displaced_step_fixup (t->ptid, sig) < 0) | |
4671 | { | |
4672 | /* Add it back to the step-over queue. */ | |
4673 | t->control.trap_expected = 0; | |
4674 | thread_step_over_chain_enqueue (t); | |
4675 | } | |
4676 | ||
4677 | regcache = get_thread_regcache (t->ptid); | |
4678 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4679 | ||
4680 | if (debug_infrun) | |
4681 | { | |
4682 | fprintf_unfiltered (gdb_stdlog, | |
4683 | "infrun: saved stop_pc=%s for %s " | |
4684 | "(currently_stepping=%d)\n", | |
4685 | paddress (target_gdbarch (), | |
4686 | t->suspend.stop_pc), | |
4687 | target_pid_to_str (t->ptid), | |
4688 | currently_stepping (t)); | |
4689 | } | |
4690 | } | |
4691 | } | |
4692 | } | |
4693 | } | |
4694 | ||
4695 | do_cleanups (old_chain); | |
4696 | ||
4697 | if (debug_infrun) | |
4698 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n"); | |
4699 | } | |
4700 | ||
f4836ba9 PA |
4701 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4702 | ||
4703 | static int | |
4704 | handle_no_resumed (struct execution_control_state *ecs) | |
4705 | { | |
4706 | struct inferior *inf; | |
4707 | struct thread_info *thread; | |
4708 | ||
3b12939d | 4709 | if (target_can_async_p ()) |
f4836ba9 | 4710 | { |
3b12939d PA |
4711 | struct ui *ui; |
4712 | int any_sync = 0; | |
f4836ba9 | 4713 | |
3b12939d PA |
4714 | ALL_UIS (ui) |
4715 | { | |
4716 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4717 | { | |
4718 | any_sync = 1; | |
4719 | break; | |
4720 | } | |
4721 | } | |
4722 | if (!any_sync) | |
4723 | { | |
4724 | /* There were no unwaited-for children left in the target, but, | |
4725 | we're not synchronously waiting for events either. Just | |
4726 | ignore. */ | |
4727 | ||
4728 | if (debug_infrun) | |
4729 | fprintf_unfiltered (gdb_stdlog, | |
4730 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4731 | "(ignoring: bg)\n"); | |
4732 | prepare_to_wait (ecs); | |
4733 | return 1; | |
4734 | } | |
f4836ba9 PA |
4735 | } |
4736 | ||
4737 | /* Otherwise, if we were running a synchronous execution command, we | |
4738 | may need to cancel it and give the user back the terminal. | |
4739 | ||
4740 | In non-stop mode, the target can't tell whether we've already | |
4741 | consumed previous stop events, so it can end up sending us a | |
4742 | no-resumed event like so: | |
4743 | ||
4744 | #0 - thread 1 is left stopped | |
4745 | ||
4746 | #1 - thread 2 is resumed and hits breakpoint | |
4747 | -> TARGET_WAITKIND_STOPPED | |
4748 | ||
4749 | #2 - thread 3 is resumed and exits | |
4750 | this is the last resumed thread, so | |
4751 | -> TARGET_WAITKIND_NO_RESUMED | |
4752 | ||
4753 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4754 | it. | |
4755 | ||
4756 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4757 | thread 2 is now resumed, so the event should be ignored. | |
4758 | ||
4759 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4760 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4761 | event. But it could be that the event meant that thread 2 itself | |
4762 | (or whatever other thread was the last resumed thread) exited. | |
4763 | ||
4764 | To address this we refresh the thread list and check whether we | |
4765 | have resumed threads _now_. In the example above, this removes | |
4766 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4767 | ignore this event. If we find no thread resumed, then we cancel | |
4768 | the synchronous command show "no unwaited-for " to the user. */ | |
4769 | update_thread_list (); | |
4770 | ||
4771 | ALL_NON_EXITED_THREADS (thread) | |
4772 | { | |
4773 | if (thread->executing | |
4774 | || thread->suspend.waitstatus_pending_p) | |
4775 | { | |
4776 | /* There were no unwaited-for children left in the target at | |
4777 | some point, but there are now. Just ignore. */ | |
4778 | if (debug_infrun) | |
4779 | fprintf_unfiltered (gdb_stdlog, | |
4780 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4781 | "(ignoring: found resumed)\n"); | |
4782 | prepare_to_wait (ecs); | |
4783 | return 1; | |
4784 | } | |
4785 | } | |
4786 | ||
4787 | /* Note however that we may find no resumed thread because the whole | |
4788 | process exited meanwhile (thus updating the thread list results | |
4789 | in an empty thread list). In this case we know we'll be getting | |
4790 | a process exit event shortly. */ | |
4791 | ALL_INFERIORS (inf) | |
4792 | { | |
4793 | if (inf->pid == 0) | |
4794 | continue; | |
4795 | ||
4796 | thread = any_live_thread_of_process (inf->pid); | |
4797 | if (thread == NULL) | |
4798 | { | |
4799 | if (debug_infrun) | |
4800 | fprintf_unfiltered (gdb_stdlog, | |
4801 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4802 | "(expect process exit)\n"); | |
4803 | prepare_to_wait (ecs); | |
4804 | return 1; | |
4805 | } | |
4806 | } | |
4807 | ||
4808 | /* Go ahead and report the event. */ | |
4809 | return 0; | |
4810 | } | |
4811 | ||
05ba8510 PA |
4812 | /* Given an execution control state that has been freshly filled in by |
4813 | an event from the inferior, figure out what it means and take | |
4814 | appropriate action. | |
4815 | ||
4816 | The alternatives are: | |
4817 | ||
22bcd14b | 4818 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
4819 | debugger. |
4820 | ||
4821 | 2) keep_going and return; to wait for the next event (set | |
4822 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
4823 | once). */ | |
c906108c | 4824 | |
ec9499be | 4825 | static void |
0b6e5e10 | 4826 | handle_inferior_event_1 (struct execution_control_state *ecs) |
cd0fc7c3 | 4827 | { |
d6b48e9c PA |
4828 | enum stop_kind stop_soon; |
4829 | ||
28736962 PA |
4830 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
4831 | { | |
4832 | /* We had an event in the inferior, but we are not interested in | |
4833 | handling it at this level. The lower layers have already | |
4834 | done what needs to be done, if anything. | |
4835 | ||
4836 | One of the possible circumstances for this is when the | |
4837 | inferior produces output for the console. The inferior has | |
4838 | not stopped, and we are ignoring the event. Another possible | |
4839 | circumstance is any event which the lower level knows will be | |
4840 | reported multiple times without an intervening resume. */ | |
4841 | if (debug_infrun) | |
4842 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
4843 | prepare_to_wait (ecs); | |
4844 | return; | |
4845 | } | |
4846 | ||
65706a29 PA |
4847 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
4848 | { | |
4849 | if (debug_infrun) | |
4850 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_THREAD_EXITED\n"); | |
4851 | prepare_to_wait (ecs); | |
4852 | return; | |
4853 | } | |
4854 | ||
0e5bf2a8 | 4855 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
4856 | && handle_no_resumed (ecs)) |
4857 | return; | |
0e5bf2a8 | 4858 | |
1777feb0 | 4859 | /* Cache the last pid/waitstatus. */ |
c32c64b7 | 4860 | set_last_target_status (ecs->ptid, ecs->ws); |
e02bc4cc | 4861 | |
ca005067 | 4862 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 4863 | stop_stack_dummy = STOP_NONE; |
ca005067 | 4864 | |
0e5bf2a8 PA |
4865 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
4866 | { | |
4867 | /* No unwaited-for children left. IOW, all resumed children | |
4868 | have exited. */ | |
4869 | if (debug_infrun) | |
4870 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
4871 | ||
4872 | stop_print_frame = 0; | |
22bcd14b | 4873 | stop_waiting (ecs); |
0e5bf2a8 PA |
4874 | return; |
4875 | } | |
4876 | ||
8c90c137 | 4877 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 4878 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 PA |
4879 | { |
4880 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
4881 | /* If it's a new thread, add it to the thread database. */ | |
4882 | if (ecs->event_thread == NULL) | |
4883 | ecs->event_thread = add_thread (ecs->ptid); | |
c1e36e3e PA |
4884 | |
4885 | /* Disable range stepping. If the next step request could use a | |
4886 | range, this will be end up re-enabled then. */ | |
4887 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 4888 | } |
88ed393a JK |
4889 | |
4890 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 4891 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
4892 | |
4893 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
4894 | reinit_frame_cache (); | |
4895 | ||
28736962 PA |
4896 | breakpoint_retire_moribund (); |
4897 | ||
2b009048 DJ |
4898 | /* First, distinguish signals caused by the debugger from signals |
4899 | that have to do with the program's own actions. Note that | |
4900 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
4901 | on the operating system version. Here we detect when a SIGILL or | |
4902 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
4903 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
4904 | when we're trying to execute a breakpoint instruction on a | |
4905 | non-executable stack. This happens for call dummy breakpoints | |
4906 | for architectures like SPARC that place call dummies on the | |
4907 | stack. */ | |
2b009048 | 4908 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
4909 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
4910 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
4911 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 4912 | { |
de0a0249 UW |
4913 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
4914 | ||
4915 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
4916 | regcache_read_pc (regcache))) | |
4917 | { | |
4918 | if (debug_infrun) | |
4919 | fprintf_unfiltered (gdb_stdlog, | |
4920 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 4921 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 4922 | } |
2b009048 DJ |
4923 | } |
4924 | ||
28736962 PA |
4925 | /* Mark the non-executing threads accordingly. In all-stop, all |
4926 | threads of all processes are stopped when we get any event | |
e1316e60 | 4927 | reported. In non-stop mode, only the event thread stops. */ |
372316f1 PA |
4928 | { |
4929 | ptid_t mark_ptid; | |
4930 | ||
fbea99ea | 4931 | if (!target_is_non_stop_p ()) |
372316f1 PA |
4932 | mark_ptid = minus_one_ptid; |
4933 | else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED | |
4934 | || ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4935 | { | |
4936 | /* If we're handling a process exit in non-stop mode, even | |
4937 | though threads haven't been deleted yet, one would think | |
4938 | that there is nothing to do, as threads of the dead process | |
4939 | will be soon deleted, and threads of any other process were | |
4940 | left running. However, on some targets, threads survive a | |
4941 | process exit event. E.g., for the "checkpoint" command, | |
4942 | when the current checkpoint/fork exits, linux-fork.c | |
4943 | automatically switches to another fork from within | |
4944 | target_mourn_inferior, by associating the same | |
4945 | inferior/thread to another fork. We haven't mourned yet at | |
4946 | this point, but we must mark any threads left in the | |
4947 | process as not-executing so that finish_thread_state marks | |
4948 | them stopped (in the user's perspective) if/when we present | |
4949 | the stop to the user. */ | |
4950 | mark_ptid = pid_to_ptid (ptid_get_pid (ecs->ptid)); | |
4951 | } | |
4952 | else | |
4953 | mark_ptid = ecs->ptid; | |
4954 | ||
4955 | set_executing (mark_ptid, 0); | |
4956 | ||
4957 | /* Likewise the resumed flag. */ | |
4958 | set_resumed (mark_ptid, 0); | |
4959 | } | |
8c90c137 | 4960 | |
488f131b JB |
4961 | switch (ecs->ws.kind) |
4962 | { | |
4963 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 4964 | if (debug_infrun) |
8a9de0e4 | 4965 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
5c09a2c5 PA |
4966 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
4967 | context_switch (ecs->ptid); | |
b0f4b84b DJ |
4968 | /* Ignore gracefully during startup of the inferior, as it might |
4969 | be the shell which has just loaded some objects, otherwise | |
4970 | add the symbols for the newly loaded objects. Also ignore at | |
4971 | the beginning of an attach or remote session; we will query | |
4972 | the full list of libraries once the connection is | |
4973 | established. */ | |
4f5d7f63 PA |
4974 | |
4975 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
c0236d92 | 4976 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 4977 | { |
edcc5120 TT |
4978 | struct regcache *regcache; |
4979 | ||
edcc5120 TT |
4980 | regcache = get_thread_regcache (ecs->ptid); |
4981 | ||
4982 | handle_solib_event (); | |
4983 | ||
4984 | ecs->event_thread->control.stop_bpstat | |
4985 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
4986 | stop_pc, ecs->ptid, &ecs->ws); | |
ab04a2af | 4987 | |
c65d6b55 PA |
4988 | if (handle_stop_requested (ecs)) |
4989 | return; | |
4990 | ||
ce12b012 | 4991 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
4992 | { |
4993 | /* A catchpoint triggered. */ | |
94c57d6a PA |
4994 | process_event_stop_test (ecs); |
4995 | return; | |
edcc5120 | 4996 | } |
488f131b | 4997 | |
b0f4b84b DJ |
4998 | /* If requested, stop when the dynamic linker notifies |
4999 | gdb of events. This allows the user to get control | |
5000 | and place breakpoints in initializer routines for | |
5001 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 5002 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
5003 | if (stop_on_solib_events) |
5004 | { | |
55409f9d DJ |
5005 | /* Make sure we print "Stopped due to solib-event" in |
5006 | normal_stop. */ | |
5007 | stop_print_frame = 1; | |
5008 | ||
22bcd14b | 5009 | stop_waiting (ecs); |
b0f4b84b DJ |
5010 | return; |
5011 | } | |
488f131b | 5012 | } |
b0f4b84b DJ |
5013 | |
5014 | /* If we are skipping through a shell, or through shared library | |
5015 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 5016 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
5017 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
5018 | { | |
74960c60 VP |
5019 | /* Loading of shared libraries might have changed breakpoint |
5020 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 5021 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 5022 | insert_breakpoints (); |
64ce06e4 | 5023 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
5024 | prepare_to_wait (ecs); |
5025 | return; | |
5026 | } | |
5027 | ||
5c09a2c5 PA |
5028 | /* But stop if we're attaching or setting up a remote |
5029 | connection. */ | |
5030 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5031 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5032 | { | |
5033 | if (debug_infrun) | |
5034 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 5035 | stop_waiting (ecs); |
5c09a2c5 PA |
5036 | return; |
5037 | } | |
5038 | ||
5039 | internal_error (__FILE__, __LINE__, | |
5040 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 5041 | |
488f131b | 5042 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 5043 | if (debug_infrun) |
8a9de0e4 | 5044 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
c65d6b55 PA |
5045 | if (handle_stop_requested (ecs)) |
5046 | return; | |
64776a0b | 5047 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
8b3ee56d | 5048 | context_switch (ecs->ptid); |
64ce06e4 | 5049 | resume (GDB_SIGNAL_0); |
488f131b JB |
5050 | prepare_to_wait (ecs); |
5051 | return; | |
c5aa993b | 5052 | |
65706a29 PA |
5053 | case TARGET_WAITKIND_THREAD_CREATED: |
5054 | if (debug_infrun) | |
5055 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_THREAD_CREATED\n"); | |
c65d6b55 PA |
5056 | if (handle_stop_requested (ecs)) |
5057 | return; | |
65706a29 PA |
5058 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
5059 | context_switch (ecs->ptid); | |
5060 | if (!switch_back_to_stepped_thread (ecs)) | |
5061 | keep_going (ecs); | |
5062 | return; | |
5063 | ||
488f131b | 5064 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5065 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 5066 | if (debug_infrun) |
940c3c06 PA |
5067 | { |
5068 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
5069 | fprintf_unfiltered (gdb_stdlog, | |
5070 | "infrun: TARGET_WAITKIND_EXITED\n"); | |
5071 | else | |
5072 | fprintf_unfiltered (gdb_stdlog, | |
5073 | "infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
5074 | } | |
5075 | ||
fb66883a | 5076 | inferior_ptid = ecs->ptid; |
c9657e70 | 5077 | set_current_inferior (find_inferior_ptid (ecs->ptid)); |
6c95b8df PA |
5078 | set_current_program_space (current_inferior ()->pspace); |
5079 | handle_vfork_child_exec_or_exit (0); | |
1777feb0 | 5080 | target_terminal_ours (); /* Must do this before mourn anyway. */ |
488f131b | 5081 | |
0c557179 SDJ |
5082 | /* Clearing any previous state of convenience variables. */ |
5083 | clear_exit_convenience_vars (); | |
5084 | ||
940c3c06 PA |
5085 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5086 | { | |
5087 | /* Record the exit code in the convenience variable $_exitcode, so | |
5088 | that the user can inspect this again later. */ | |
5089 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5090 | (LONGEST) ecs->ws.value.integer); | |
5091 | ||
5092 | /* Also record this in the inferior itself. */ | |
5093 | current_inferior ()->has_exit_code = 1; | |
5094 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5095 | |
98eb56a4 PA |
5096 | /* Support the --return-child-result option. */ |
5097 | return_child_result_value = ecs->ws.value.integer; | |
5098 | ||
fd664c91 | 5099 | observer_notify_exited (ecs->ws.value.integer); |
940c3c06 PA |
5100 | } |
5101 | else | |
0c557179 SDJ |
5102 | { |
5103 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
5104 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
5105 | ||
5106 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5107 | { | |
5108 | /* Set the value of the internal variable $_exitsignal, | |
5109 | which holds the signal uncaught by the inferior. */ | |
5110 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5111 | gdbarch_gdb_signal_to_target (gdbarch, | |
5112 | ecs->ws.value.sig)); | |
5113 | } | |
5114 | else | |
5115 | { | |
5116 | /* We don't have access to the target's method used for | |
5117 | converting between signal numbers (GDB's internal | |
5118 | representation <-> target's representation). | |
5119 | Therefore, we cannot do a good job at displaying this | |
5120 | information to the user. It's better to just warn | |
5121 | her about it (if infrun debugging is enabled), and | |
5122 | give up. */ | |
5123 | if (debug_infrun) | |
5124 | fprintf_filtered (gdb_stdlog, _("\ | |
5125 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
5126 | } | |
5127 | ||
fd664c91 | 5128 | observer_notify_signal_exited (ecs->ws.value.sig); |
0c557179 | 5129 | } |
8cf64490 | 5130 | |
488f131b | 5131 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5132 | target_mourn_inferior (inferior_ptid); |
488f131b | 5133 | stop_print_frame = 0; |
22bcd14b | 5134 | stop_waiting (ecs); |
488f131b | 5135 | return; |
c5aa993b | 5136 | |
488f131b | 5137 | /* The following are the only cases in which we keep going; |
1777feb0 | 5138 | the above cases end in a continue or goto. */ |
488f131b | 5139 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5140 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 5141 | if (debug_infrun) |
fed708ed PA |
5142 | { |
5143 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
5144 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); | |
5145 | else | |
5146 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n"); | |
5147 | } | |
c906108c | 5148 | |
e2d96639 YQ |
5149 | /* Check whether the inferior is displaced stepping. */ |
5150 | { | |
5151 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
5152 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
e2d96639 YQ |
5153 | |
5154 | /* If checking displaced stepping is supported, and thread | |
5155 | ecs->ptid is displaced stepping. */ | |
c0987663 | 5156 | if (displaced_step_in_progress_thread (ecs->ptid)) |
e2d96639 YQ |
5157 | { |
5158 | struct inferior *parent_inf | |
c9657e70 | 5159 | = find_inferior_ptid (ecs->ptid); |
e2d96639 YQ |
5160 | struct regcache *child_regcache; |
5161 | CORE_ADDR parent_pc; | |
5162 | ||
5163 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
5164 | indicating that the displaced stepping of syscall instruction | |
5165 | has been done. Perform cleanup for parent process here. Note | |
5166 | that this operation also cleans up the child process for vfork, | |
5167 | because their pages are shared. */ | |
a493e3e2 | 5168 | displaced_step_fixup (ecs->ptid, GDB_SIGNAL_TRAP); |
c2829269 PA |
5169 | /* Start a new step-over in another thread if there's one |
5170 | that needs it. */ | |
5171 | start_step_over (); | |
e2d96639 YQ |
5172 | |
5173 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
5174 | { | |
c0987663 YQ |
5175 | struct displaced_step_inferior_state *displaced |
5176 | = get_displaced_stepping_state (ptid_get_pid (ecs->ptid)); | |
5177 | ||
e2d96639 YQ |
5178 | /* Restore scratch pad for child process. */ |
5179 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
5180 | } | |
5181 | ||
5182 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
5183 | the child's PC is also within the scratchpad. Set the child's PC | |
5184 | to the parent's PC value, which has already been fixed up. | |
5185 | FIXME: we use the parent's aspace here, although we're touching | |
5186 | the child, because the child hasn't been added to the inferior | |
5187 | list yet at this point. */ | |
5188 | ||
5189 | child_regcache | |
5190 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
5191 | gdbarch, | |
5192 | parent_inf->aspace); | |
5193 | /* Read PC value of parent process. */ | |
5194 | parent_pc = regcache_read_pc (regcache); | |
5195 | ||
5196 | if (debug_displaced) | |
5197 | fprintf_unfiltered (gdb_stdlog, | |
5198 | "displaced: write child pc from %s to %s\n", | |
5199 | paddress (gdbarch, | |
5200 | regcache_read_pc (child_regcache)), | |
5201 | paddress (gdbarch, parent_pc)); | |
5202 | ||
5203 | regcache_write_pc (child_regcache, parent_pc); | |
5204 | } | |
5205 | } | |
5206 | ||
5a2901d9 | 5207 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 5208 | context_switch (ecs->ptid); |
5a2901d9 | 5209 | |
b242c3c2 PA |
5210 | /* Immediately detach breakpoints from the child before there's |
5211 | any chance of letting the user delete breakpoints from the | |
5212 | breakpoint lists. If we don't do this early, it's easy to | |
5213 | leave left over traps in the child, vis: "break foo; catch | |
5214 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5215 | the fork on the last `continue', and by that time the | |
5216 | breakpoint at "foo" is long gone from the breakpoint table. | |
5217 | If we vforked, then we don't need to unpatch here, since both | |
5218 | parent and child are sharing the same memory pages; we'll | |
5219 | need to unpatch at follow/detach time instead to be certain | |
5220 | that new breakpoints added between catchpoint hit time and | |
5221 | vfork follow are detached. */ | |
5222 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5223 | { | |
b242c3c2 PA |
5224 | /* This won't actually modify the breakpoint list, but will |
5225 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5226 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5227 | } |
5228 | ||
34b7e8a6 | 5229 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5230 | |
e58b0e63 PA |
5231 | /* In case the event is caught by a catchpoint, remember that |
5232 | the event is to be followed at the next resume of the thread, | |
5233 | and not immediately. */ | |
5234 | ecs->event_thread->pending_follow = ecs->ws; | |
5235 | ||
fb14de7b | 5236 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 5237 | |
16c381f0 | 5238 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 5239 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 5240 | stop_pc, ecs->ptid, &ecs->ws); |
675bf4cb | 5241 | |
c65d6b55 PA |
5242 | if (handle_stop_requested (ecs)) |
5243 | return; | |
5244 | ||
ce12b012 PA |
5245 | /* If no catchpoint triggered for this, then keep going. Note |
5246 | that we're interested in knowing the bpstat actually causes a | |
5247 | stop, not just if it may explain the signal. Software | |
5248 | watchpoints, for example, always appear in the bpstat. */ | |
5249 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5250 | { |
6c95b8df PA |
5251 | ptid_t parent; |
5252 | ptid_t child; | |
e58b0e63 | 5253 | int should_resume; |
3e43a32a MS |
5254 | int follow_child |
5255 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 5256 | |
a493e3e2 | 5257 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 PA |
5258 | |
5259 | should_resume = follow_fork (); | |
5260 | ||
6c95b8df PA |
5261 | parent = ecs->ptid; |
5262 | child = ecs->ws.value.related_pid; | |
5263 | ||
a2077e25 PA |
5264 | /* At this point, the parent is marked running, and the |
5265 | child is marked stopped. */ | |
5266 | ||
5267 | /* If not resuming the parent, mark it stopped. */ | |
5268 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
5269 | set_running (parent, 0); | |
5270 | ||
5271 | /* If resuming the child, mark it running. */ | |
5272 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
5273 | set_running (child, 1); | |
5274 | ||
6c95b8df | 5275 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5276 | if (!detach_fork && (non_stop |
5277 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5278 | { |
5279 | if (follow_child) | |
5280 | switch_to_thread (parent); | |
5281 | else | |
5282 | switch_to_thread (child); | |
5283 | ||
5284 | ecs->event_thread = inferior_thread (); | |
5285 | ecs->ptid = inferior_ptid; | |
5286 | keep_going (ecs); | |
5287 | } | |
5288 | ||
5289 | if (follow_child) | |
5290 | switch_to_thread (child); | |
5291 | else | |
5292 | switch_to_thread (parent); | |
5293 | ||
e58b0e63 PA |
5294 | ecs->event_thread = inferior_thread (); |
5295 | ecs->ptid = inferior_ptid; | |
5296 | ||
5297 | if (should_resume) | |
5298 | keep_going (ecs); | |
5299 | else | |
22bcd14b | 5300 | stop_waiting (ecs); |
04e68871 DJ |
5301 | return; |
5302 | } | |
94c57d6a PA |
5303 | process_event_stop_test (ecs); |
5304 | return; | |
488f131b | 5305 | |
6c95b8df PA |
5306 | case TARGET_WAITKIND_VFORK_DONE: |
5307 | /* Done with the shared memory region. Re-insert breakpoints in | |
5308 | the parent, and keep going. */ | |
5309 | ||
5310 | if (debug_infrun) | |
3e43a32a MS |
5311 | fprintf_unfiltered (gdb_stdlog, |
5312 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
6c95b8df PA |
5313 | |
5314 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5315 | context_switch (ecs->ptid); | |
5316 | ||
5317 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5318 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5319 | |
5320 | if (handle_stop_requested (ecs)) | |
5321 | return; | |
5322 | ||
6c95b8df PA |
5323 | /* This also takes care of reinserting breakpoints in the |
5324 | previously locked inferior. */ | |
5325 | keep_going (ecs); | |
5326 | return; | |
5327 | ||
488f131b | 5328 | case TARGET_WAITKIND_EXECD: |
527159b7 | 5329 | if (debug_infrun) |
fc5261f2 | 5330 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 5331 | |
5a2901d9 | 5332 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 5333 | context_switch (ecs->ptid); |
5a2901d9 | 5334 | |
fb14de7b | 5335 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
795e548f | 5336 | |
6c95b8df PA |
5337 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5338 | handle_vfork_child_exec_or_exit (1); | |
5339 | ||
795e548f PA |
5340 | /* This causes the eventpoints and symbol table to be reset. |
5341 | Must do this now, before trying to determine whether to | |
5342 | stop. */ | |
71b43ef8 | 5343 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5344 | |
17d8546e DB |
5345 | /* In follow_exec we may have deleted the original thread and |
5346 | created a new one. Make sure that the event thread is the | |
5347 | execd thread for that case (this is a nop otherwise). */ | |
5348 | ecs->event_thread = inferior_thread (); | |
5349 | ||
16c381f0 | 5350 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 5351 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 5352 | stop_pc, ecs->ptid, &ecs->ws); |
795e548f | 5353 | |
71b43ef8 PA |
5354 | /* Note that this may be referenced from inside |
5355 | bpstat_stop_status above, through inferior_has_execd. */ | |
5356 | xfree (ecs->ws.value.execd_pathname); | |
5357 | ecs->ws.value.execd_pathname = NULL; | |
5358 | ||
c65d6b55 PA |
5359 | if (handle_stop_requested (ecs)) |
5360 | return; | |
5361 | ||
04e68871 | 5362 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5363 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5364 | { |
a493e3e2 | 5365 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5366 | keep_going (ecs); |
5367 | return; | |
5368 | } | |
94c57d6a PA |
5369 | process_event_stop_test (ecs); |
5370 | return; | |
488f131b | 5371 | |
b4dc5ffa MK |
5372 | /* Be careful not to try to gather much state about a thread |
5373 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5374 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 5375 | if (debug_infrun) |
3e43a32a MS |
5376 | fprintf_unfiltered (gdb_stdlog, |
5377 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
1777feb0 | 5378 | /* Getting the current syscall number. */ |
94c57d6a PA |
5379 | if (handle_syscall_event (ecs) == 0) |
5380 | process_event_stop_test (ecs); | |
5381 | return; | |
c906108c | 5382 | |
488f131b JB |
5383 | /* Before examining the threads further, step this thread to |
5384 | get it entirely out of the syscall. (We get notice of the | |
5385 | event when the thread is just on the verge of exiting a | |
5386 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5387 | into user code.) */ |
488f131b | 5388 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 5389 | if (debug_infrun) |
3e43a32a MS |
5390 | fprintf_unfiltered (gdb_stdlog, |
5391 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
94c57d6a PA |
5392 | if (handle_syscall_event (ecs) == 0) |
5393 | process_event_stop_test (ecs); | |
5394 | return; | |
c906108c | 5395 | |
488f131b | 5396 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 5397 | if (debug_infrun) |
8a9de0e4 | 5398 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
4f5d7f63 PA |
5399 | handle_signal_stop (ecs); |
5400 | return; | |
c906108c | 5401 | |
b2175913 | 5402 | case TARGET_WAITKIND_NO_HISTORY: |
4b4e080e PA |
5403 | if (debug_infrun) |
5404 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
b2175913 | 5405 | /* Reverse execution: target ran out of history info. */ |
eab402df | 5406 | |
d1988021 MM |
5407 | /* Switch to the stopped thread. */ |
5408 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5409 | context_switch (ecs->ptid); | |
5410 | if (debug_infrun) | |
5411 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
5412 | ||
34b7e8a6 | 5413 | delete_just_stopped_threads_single_step_breakpoints (); |
d1988021 | 5414 | stop_pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); |
c65d6b55 PA |
5415 | |
5416 | if (handle_stop_requested (ecs)) | |
5417 | return; | |
5418 | ||
fd664c91 | 5419 | observer_notify_no_history (); |
22bcd14b | 5420 | stop_waiting (ecs); |
b2175913 | 5421 | return; |
488f131b | 5422 | } |
4f5d7f63 PA |
5423 | } |
5424 | ||
0b6e5e10 JB |
5425 | /* A wrapper around handle_inferior_event_1, which also makes sure |
5426 | that all temporary struct value objects that were created during | |
5427 | the handling of the event get deleted at the end. */ | |
5428 | ||
5429 | static void | |
5430 | handle_inferior_event (struct execution_control_state *ecs) | |
5431 | { | |
5432 | struct value *mark = value_mark (); | |
5433 | ||
5434 | handle_inferior_event_1 (ecs); | |
5435 | /* Purge all temporary values created during the event handling, | |
5436 | as it could be a long time before we return to the command level | |
5437 | where such values would otherwise be purged. */ | |
5438 | value_free_to_mark (mark); | |
5439 | } | |
5440 | ||
372316f1 PA |
5441 | /* Restart threads back to what they were trying to do back when we |
5442 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5443 | ignored. */ | |
4d9d9d04 PA |
5444 | |
5445 | static void | |
372316f1 PA |
5446 | restart_threads (struct thread_info *event_thread) |
5447 | { | |
5448 | struct thread_info *tp; | |
372316f1 PA |
5449 | |
5450 | /* In case the instruction just stepped spawned a new thread. */ | |
5451 | update_thread_list (); | |
5452 | ||
5453 | ALL_NON_EXITED_THREADS (tp) | |
5454 | { | |
5455 | if (tp == event_thread) | |
5456 | { | |
5457 | if (debug_infrun) | |
5458 | fprintf_unfiltered (gdb_stdlog, | |
5459 | "infrun: restart threads: " | |
5460 | "[%s] is event thread\n", | |
5461 | target_pid_to_str (tp->ptid)); | |
5462 | continue; | |
5463 | } | |
5464 | ||
5465 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5466 | { | |
5467 | if (debug_infrun) | |
5468 | fprintf_unfiltered (gdb_stdlog, | |
5469 | "infrun: restart threads: " | |
5470 | "[%s] not meant to be running\n", | |
5471 | target_pid_to_str (tp->ptid)); | |
5472 | continue; | |
5473 | } | |
5474 | ||
5475 | if (tp->resumed) | |
5476 | { | |
5477 | if (debug_infrun) | |
5478 | fprintf_unfiltered (gdb_stdlog, | |
5479 | "infrun: restart threads: [%s] resumed\n", | |
5480 | target_pid_to_str (tp->ptid)); | |
5481 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
5482 | continue; | |
5483 | } | |
5484 | ||
5485 | if (thread_is_in_step_over_chain (tp)) | |
5486 | { | |
5487 | if (debug_infrun) | |
5488 | fprintf_unfiltered (gdb_stdlog, | |
5489 | "infrun: restart threads: " | |
5490 | "[%s] needs step-over\n", | |
5491 | target_pid_to_str (tp->ptid)); | |
5492 | gdb_assert (!tp->resumed); | |
5493 | continue; | |
5494 | } | |
5495 | ||
5496 | ||
5497 | if (tp->suspend.waitstatus_pending_p) | |
5498 | { | |
5499 | if (debug_infrun) | |
5500 | fprintf_unfiltered (gdb_stdlog, | |
5501 | "infrun: restart threads: " | |
5502 | "[%s] has pending status\n", | |
5503 | target_pid_to_str (tp->ptid)); | |
5504 | tp->resumed = 1; | |
5505 | continue; | |
5506 | } | |
5507 | ||
c65d6b55 PA |
5508 | gdb_assert (!tp->stop_requested); |
5509 | ||
372316f1 PA |
5510 | /* If some thread needs to start a step-over at this point, it |
5511 | should still be in the step-over queue, and thus skipped | |
5512 | above. */ | |
5513 | if (thread_still_needs_step_over (tp)) | |
5514 | { | |
5515 | internal_error (__FILE__, __LINE__, | |
5516 | "thread [%s] needs a step-over, but not in " | |
5517 | "step-over queue\n", | |
5518 | target_pid_to_str (tp->ptid)); | |
5519 | } | |
5520 | ||
5521 | if (currently_stepping (tp)) | |
5522 | { | |
5523 | if (debug_infrun) | |
5524 | fprintf_unfiltered (gdb_stdlog, | |
5525 | "infrun: restart threads: [%s] was stepping\n", | |
5526 | target_pid_to_str (tp->ptid)); | |
5527 | keep_going_stepped_thread (tp); | |
5528 | } | |
5529 | else | |
5530 | { | |
5531 | struct execution_control_state ecss; | |
5532 | struct execution_control_state *ecs = &ecss; | |
5533 | ||
5534 | if (debug_infrun) | |
5535 | fprintf_unfiltered (gdb_stdlog, | |
5536 | "infrun: restart threads: [%s] continuing\n", | |
5537 | target_pid_to_str (tp->ptid)); | |
5538 | reset_ecs (ecs, tp); | |
5539 | switch_to_thread (tp->ptid); | |
5540 | keep_going_pass_signal (ecs); | |
5541 | } | |
5542 | } | |
5543 | } | |
5544 | ||
5545 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5546 | a pending waitstatus. */ | |
5547 | ||
5548 | static int | |
5549 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5550 | void *arg) | |
5551 | { | |
5552 | return (tp->resumed | |
5553 | && tp->suspend.waitstatus_pending_p); | |
5554 | } | |
5555 | ||
5556 | /* Called when we get an event that may finish an in-line or | |
5557 | out-of-line (displaced stepping) step-over started previously. | |
5558 | Return true if the event is processed and we should go back to the | |
5559 | event loop; false if the caller should continue processing the | |
5560 | event. */ | |
5561 | ||
5562 | static int | |
4d9d9d04 PA |
5563 | finish_step_over (struct execution_control_state *ecs) |
5564 | { | |
372316f1 PA |
5565 | int had_step_over_info; |
5566 | ||
4d9d9d04 PA |
5567 | displaced_step_fixup (ecs->ptid, |
5568 | ecs->event_thread->suspend.stop_signal); | |
5569 | ||
372316f1 PA |
5570 | had_step_over_info = step_over_info_valid_p (); |
5571 | ||
5572 | if (had_step_over_info) | |
4d9d9d04 PA |
5573 | { |
5574 | /* If we're stepping over a breakpoint with all threads locked, | |
5575 | then only the thread that was stepped should be reporting | |
5576 | back an event. */ | |
5577 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5578 | ||
c65d6b55 | 5579 | clear_step_over_info (); |
4d9d9d04 PA |
5580 | } |
5581 | ||
fbea99ea | 5582 | if (!target_is_non_stop_p ()) |
372316f1 | 5583 | return 0; |
4d9d9d04 PA |
5584 | |
5585 | /* Start a new step-over in another thread if there's one that | |
5586 | needs it. */ | |
5587 | start_step_over (); | |
372316f1 PA |
5588 | |
5589 | /* If we were stepping over a breakpoint before, and haven't started | |
5590 | a new in-line step-over sequence, then restart all other threads | |
5591 | (except the event thread). We can't do this in all-stop, as then | |
5592 | e.g., we wouldn't be able to issue any other remote packet until | |
5593 | these other threads stop. */ | |
5594 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5595 | { | |
5596 | struct thread_info *pending; | |
5597 | ||
5598 | /* If we only have threads with pending statuses, the restart | |
5599 | below won't restart any thread and so nothing re-inserts the | |
5600 | breakpoint we just stepped over. But we need it inserted | |
5601 | when we later process the pending events, otherwise if | |
5602 | another thread has a pending event for this breakpoint too, | |
5603 | we'd discard its event (because the breakpoint that | |
5604 | originally caused the event was no longer inserted). */ | |
5605 | context_switch (ecs->ptid); | |
5606 | insert_breakpoints (); | |
5607 | ||
5608 | restart_threads (ecs->event_thread); | |
5609 | ||
5610 | /* If we have events pending, go through handle_inferior_event | |
5611 | again, picking up a pending event at random. This avoids | |
5612 | thread starvation. */ | |
5613 | ||
5614 | /* But not if we just stepped over a watchpoint in order to let | |
5615 | the instruction execute so we can evaluate its expression. | |
5616 | The set of watchpoints that triggered is recorded in the | |
5617 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5618 | If we processed another event first, that other event could | |
5619 | clobber this info. */ | |
5620 | if (ecs->event_thread->stepping_over_watchpoint) | |
5621 | return 0; | |
5622 | ||
5623 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5624 | NULL); | |
5625 | if (pending != NULL) | |
5626 | { | |
5627 | struct thread_info *tp = ecs->event_thread; | |
5628 | struct regcache *regcache; | |
5629 | ||
5630 | if (debug_infrun) | |
5631 | { | |
5632 | fprintf_unfiltered (gdb_stdlog, | |
5633 | "infrun: found resumed threads with " | |
5634 | "pending events, saving status\n"); | |
5635 | } | |
5636 | ||
5637 | gdb_assert (pending != tp); | |
5638 | ||
5639 | /* Record the event thread's event for later. */ | |
5640 | save_waitstatus (tp, &ecs->ws); | |
5641 | /* This was cleared early, by handle_inferior_event. Set it | |
5642 | so this pending event is considered by | |
5643 | do_target_wait. */ | |
5644 | tp->resumed = 1; | |
5645 | ||
5646 | gdb_assert (!tp->executing); | |
5647 | ||
5648 | regcache = get_thread_regcache (tp->ptid); | |
5649 | tp->suspend.stop_pc = regcache_read_pc (regcache); | |
5650 | ||
5651 | if (debug_infrun) | |
5652 | { | |
5653 | fprintf_unfiltered (gdb_stdlog, | |
5654 | "infrun: saved stop_pc=%s for %s " | |
5655 | "(currently_stepping=%d)\n", | |
5656 | paddress (target_gdbarch (), | |
5657 | tp->suspend.stop_pc), | |
5658 | target_pid_to_str (tp->ptid), | |
5659 | currently_stepping (tp)); | |
5660 | } | |
5661 | ||
5662 | /* This in-line step-over finished; clear this so we won't | |
5663 | start a new one. This is what handle_signal_stop would | |
5664 | do, if we returned false. */ | |
5665 | tp->stepping_over_breakpoint = 0; | |
5666 | ||
5667 | /* Wake up the event loop again. */ | |
5668 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5669 | ||
5670 | prepare_to_wait (ecs); | |
5671 | return 1; | |
5672 | } | |
5673 | } | |
5674 | ||
5675 | return 0; | |
4d9d9d04 PA |
5676 | } |
5677 | ||
4f5d7f63 PA |
5678 | /* Come here when the program has stopped with a signal. */ |
5679 | ||
5680 | static void | |
5681 | handle_signal_stop (struct execution_control_state *ecs) | |
5682 | { | |
5683 | struct frame_info *frame; | |
5684 | struct gdbarch *gdbarch; | |
5685 | int stopped_by_watchpoint; | |
5686 | enum stop_kind stop_soon; | |
5687 | int random_signal; | |
c906108c | 5688 | |
f0407826 DE |
5689 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5690 | ||
c65d6b55 PA |
5691 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5692 | ||
f0407826 DE |
5693 | /* Do we need to clean up the state of a thread that has |
5694 | completed a displaced single-step? (Doing so usually affects | |
5695 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5696 | if (finish_step_over (ecs)) |
5697 | return; | |
f0407826 DE |
5698 | |
5699 | /* If we either finished a single-step or hit a breakpoint, but | |
5700 | the user wanted this thread to be stopped, pretend we got a | |
5701 | SIG0 (generic unsignaled stop). */ | |
5702 | if (ecs->event_thread->stop_requested | |
5703 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5704 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5705 | |
515630c5 | 5706 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 5707 | |
527159b7 | 5708 | if (debug_infrun) |
237fc4c9 | 5709 | { |
5af949e3 UW |
5710 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
5711 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7f82dfc7 JK |
5712 | struct cleanup *old_chain = save_inferior_ptid (); |
5713 | ||
5714 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
5715 | |
5716 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
5717 | paddress (gdbarch, stop_pc)); | |
d92524f1 | 5718 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5719 | { |
5720 | CORE_ADDR addr; | |
abbb1732 | 5721 | |
237fc4c9 PA |
5722 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
5723 | ||
5724 | if (target_stopped_data_address (¤t_target, &addr)) | |
5725 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5726 | "infrun: stopped data address = %s\n", |
5727 | paddress (gdbarch, addr)); | |
237fc4c9 PA |
5728 | else |
5729 | fprintf_unfiltered (gdb_stdlog, | |
5730 | "infrun: (no data address available)\n"); | |
5731 | } | |
7f82dfc7 JK |
5732 | |
5733 | do_cleanups (old_chain); | |
237fc4c9 | 5734 | } |
527159b7 | 5735 | |
36fa8042 PA |
5736 | /* This is originated from start_remote(), start_inferior() and |
5737 | shared libraries hook functions. */ | |
5738 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
5739 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) | |
5740 | { | |
5741 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5742 | context_switch (ecs->ptid); | |
5743 | if (debug_infrun) | |
5744 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
5745 | stop_print_frame = 1; | |
22bcd14b | 5746 | stop_waiting (ecs); |
36fa8042 PA |
5747 | return; |
5748 | } | |
5749 | ||
36fa8042 PA |
5750 | /* This originates from attach_command(). We need to overwrite |
5751 | the stop_signal here, because some kernels don't ignore a | |
5752 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5753 | See more comments in inferior.h. On the other hand, if we | |
5754 | get a non-SIGSTOP, report it to the user - assume the backend | |
5755 | will handle the SIGSTOP if it should show up later. | |
5756 | ||
5757 | Also consider that the attach is complete when we see a | |
5758 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5759 | target extended-remote report it instead of a SIGSTOP | |
5760 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5761 | signal, so this is no exception. | |
5762 | ||
5763 | Also consider that the attach is complete when we see a | |
5764 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5765 | the target to stop all threads of the inferior, in case the | |
5766 | low level attach operation doesn't stop them implicitly. If | |
5767 | they weren't stopped implicitly, then the stub will report a | |
5768 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5769 | other than GDB's request. */ | |
5770 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5771 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5772 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5773 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5774 | { | |
5775 | stop_print_frame = 1; | |
22bcd14b | 5776 | stop_waiting (ecs); |
36fa8042 PA |
5777 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5778 | return; | |
5779 | } | |
5780 | ||
488f131b | 5781 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
5782 | so, then switch to that thread. */ |
5783 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 5784 | { |
527159b7 | 5785 | if (debug_infrun) |
8a9de0e4 | 5786 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 5787 | |
0d1e5fa7 | 5788 | context_switch (ecs->ptid); |
c5aa993b | 5789 | |
9a4105ab | 5790 | if (deprecated_context_hook) |
5d5658a1 | 5791 | deprecated_context_hook (ptid_to_global_thread_id (ecs->ptid)); |
488f131b | 5792 | } |
c906108c | 5793 | |
568d6575 UW |
5794 | /* At this point, get hold of the now-current thread's frame. */ |
5795 | frame = get_current_frame (); | |
5796 | gdbarch = get_frame_arch (frame); | |
5797 | ||
2adfaa28 | 5798 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5799 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5800 | { |
af48d08f PA |
5801 | struct regcache *regcache; |
5802 | struct address_space *aspace; | |
5803 | CORE_ADDR pc; | |
2adfaa28 | 5804 | |
af48d08f PA |
5805 | regcache = get_thread_regcache (ecs->ptid); |
5806 | aspace = get_regcache_aspace (regcache); | |
5807 | pc = regcache_read_pc (regcache); | |
34b7e8a6 | 5808 | |
af48d08f PA |
5809 | /* However, before doing so, if this single-step breakpoint was |
5810 | actually for another thread, set this thread up for moving | |
5811 | past it. */ | |
5812 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5813 | aspace, pc)) | |
5814 | { | |
5815 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
5816 | { |
5817 | if (debug_infrun) | |
5818 | { | |
5819 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 5820 | "infrun: [%s] hit another thread's " |
34b7e8a6 PA |
5821 | "single-step breakpoint\n", |
5822 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 | 5823 | } |
af48d08f PA |
5824 | ecs->hit_singlestep_breakpoint = 1; |
5825 | } | |
5826 | } | |
5827 | else | |
5828 | { | |
5829 | if (debug_infrun) | |
5830 | { | |
5831 | fprintf_unfiltered (gdb_stdlog, | |
5832 | "infrun: [%s] hit its " | |
5833 | "single-step breakpoint\n", | |
5834 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 PA |
5835 | } |
5836 | } | |
488f131b | 5837 | } |
af48d08f | 5838 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5839 | |
963f9c80 PA |
5840 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5841 | && ecs->event_thread->control.trap_expected | |
5842 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5843 | stopped_by_watchpoint = 0; |
5844 | else | |
5845 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5846 | ||
5847 | /* If necessary, step over this watchpoint. We'll be back to display | |
5848 | it in a moment. */ | |
5849 | if (stopped_by_watchpoint | |
d92524f1 | 5850 | && (target_have_steppable_watchpoint |
568d6575 | 5851 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5852 | { |
488f131b JB |
5853 | /* At this point, we are stopped at an instruction which has |
5854 | attempted to write to a piece of memory under control of | |
5855 | a watchpoint. The instruction hasn't actually executed | |
5856 | yet. If we were to evaluate the watchpoint expression | |
5857 | now, we would get the old value, and therefore no change | |
5858 | would seem to have occurred. | |
5859 | ||
5860 | In order to make watchpoints work `right', we really need | |
5861 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5862 | watchpoint expression. We do this by single-stepping the |
5863 | target. | |
5864 | ||
7f89fd65 | 5865 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5866 | it. For example, the PA can (with some kernel cooperation) |
5867 | single step over a watchpoint without disabling the watchpoint. | |
5868 | ||
5869 | It is far more common to need to disable a watchpoint to step | |
5870 | the inferior over it. If we have non-steppable watchpoints, | |
5871 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5872 | disable all watchpoints. |
5873 | ||
5874 | Any breakpoint at PC must also be stepped over -- if there's | |
5875 | one, it will have already triggered before the watchpoint | |
5876 | triggered, and we either already reported it to the user, or | |
5877 | it didn't cause a stop and we called keep_going. In either | |
5878 | case, if there was a breakpoint at PC, we must be trying to | |
5879 | step past it. */ | |
5880 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5881 | keep_going (ecs); | |
488f131b JB |
5882 | return; |
5883 | } | |
5884 | ||
4e1c45ea | 5885 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5886 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5887 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5888 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5889 | stop_print_frame = 1; |
488f131b | 5890 | stopped_by_random_signal = 0; |
488f131b | 5891 | |
edb3359d DJ |
5892 | /* Hide inlined functions starting here, unless we just performed stepi or |
5893 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5894 | inline function call sites). */ | |
16c381f0 | 5895 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f GB |
5896 | { |
5897 | struct address_space *aspace = | |
5898 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
5899 | ||
5900 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5901 | determine that the address is one where functions cannot have | |
5902 | been inlined. This improves performance with inferiors that | |
5903 | load a lot of shared libraries, because the solib event | |
5904 | breakpoint is defined as the address of a function (i.e. not | |
5905 | inline). Note that we have to check the previous PC as well | |
5906 | as the current one to catch cases when we have just | |
5907 | single-stepped off a breakpoint prior to reinstating it. | |
5908 | Note that we're assuming that the code we single-step to is | |
5909 | not inline, but that's not definitive: there's nothing | |
5910 | preventing the event breakpoint function from containing | |
5911 | inlined code, and the single-step ending up there. If the | |
5912 | user had set a breakpoint on that inlined code, the missing | |
5913 | skip_inline_frames call would break things. Fortunately | |
5914 | that's an extremely unlikely scenario. */ | |
09ac7c10 | 5915 | if (!pc_at_non_inline_function (aspace, stop_pc, &ecs->ws) |
a210c238 MR |
5916 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5917 | && ecs->event_thread->control.trap_expected | |
5918 | && pc_at_non_inline_function (aspace, | |
5919 | ecs->event_thread->prev_pc, | |
09ac7c10 | 5920 | &ecs->ws))) |
1c5a993e MR |
5921 | { |
5922 | skip_inline_frames (ecs->ptid); | |
5923 | ||
5924 | /* Re-fetch current thread's frame in case that invalidated | |
5925 | the frame cache. */ | |
5926 | frame = get_current_frame (); | |
5927 | gdbarch = get_frame_arch (frame); | |
5928 | } | |
0574c78f | 5929 | } |
edb3359d | 5930 | |
a493e3e2 | 5931 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 5932 | && ecs->event_thread->control.trap_expected |
568d6575 | 5933 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 5934 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 5935 | { |
b50d7442 | 5936 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 5937 | also on an instruction that needs to be stepped multiple |
1777feb0 | 5938 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
5939 | with a delay slot. It needs to be stepped twice, once for |
5940 | the instruction and once for the delay slot. */ | |
5941 | int step_through_delay | |
568d6575 | 5942 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 5943 | |
527159b7 | 5944 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 5945 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
5946 | if (ecs->event_thread->control.step_range_end == 0 |
5947 | && step_through_delay) | |
3352ef37 AC |
5948 | { |
5949 | /* The user issued a continue when stopped at a breakpoint. | |
5950 | Set up for another trap and get out of here. */ | |
4e1c45ea | 5951 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5952 | keep_going (ecs); |
5953 | return; | |
5954 | } | |
5955 | else if (step_through_delay) | |
5956 | { | |
5957 | /* The user issued a step when stopped at a breakpoint. | |
5958 | Maybe we should stop, maybe we should not - the delay | |
5959 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
5960 | case, don't decide that here, just set |
5961 | ecs->stepping_over_breakpoint, making sure we | |
5962 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 5963 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5964 | } |
5965 | } | |
5966 | ||
ab04a2af TT |
5967 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
5968 | handles this event. */ | |
5969 | ecs->event_thread->control.stop_bpstat | |
5970 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
5971 | stop_pc, ecs->ptid, &ecs->ws); | |
db82e815 | 5972 | |
ab04a2af TT |
5973 | /* Following in case break condition called a |
5974 | function. */ | |
5975 | stop_print_frame = 1; | |
73dd234f | 5976 | |
ab04a2af TT |
5977 | /* This is where we handle "moribund" watchpoints. Unlike |
5978 | software breakpoints traps, hardware watchpoint traps are | |
5979 | always distinguishable from random traps. If no high-level | |
5980 | watchpoint is associated with the reported stop data address | |
5981 | anymore, then the bpstat does not explain the signal --- | |
5982 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
5983 | set. */ | |
5984 | ||
5985 | if (debug_infrun | |
5986 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 5987 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 5988 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
5989 | && stopped_by_watchpoint) |
5990 | fprintf_unfiltered (gdb_stdlog, | |
5991 | "infrun: no user watchpoint explains " | |
5992 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 5993 | |
bac7d97b | 5994 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
5995 | at one stage in the past included checks for an inferior |
5996 | function call's call dummy's return breakpoint. The original | |
5997 | comment, that went with the test, read: | |
03cebad2 | 5998 | |
ab04a2af TT |
5999 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6000 | another signal besides SIGTRAP, so check here as well as | |
6001 | above.'' | |
73dd234f | 6002 | |
ab04a2af TT |
6003 | If someone ever tries to get call dummys on a |
6004 | non-executable stack to work (where the target would stop | |
6005 | with something like a SIGSEGV), then those tests might need | |
6006 | to be re-instated. Given, however, that the tests were only | |
6007 | enabled when momentary breakpoints were not being used, I | |
6008 | suspect that it won't be the case. | |
488f131b | 6009 | |
ab04a2af TT |
6010 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6011 | be necessary for call dummies on a non-executable stack on | |
6012 | SPARC. */ | |
488f131b | 6013 | |
bac7d97b | 6014 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6015 | random_signal |
6016 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
6017 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 6018 | |
1cf4d951 PA |
6019 | /* Maybe this was a trap for a software breakpoint that has since |
6020 | been removed. */ | |
6021 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6022 | { | |
6023 | if (program_breakpoint_here_p (gdbarch, stop_pc)) | |
6024 | { | |
6025 | struct regcache *regcache; | |
6026 | int decr_pc; | |
6027 | ||
6028 | /* Re-adjust PC to what the program would see if GDB was not | |
6029 | debugging it. */ | |
6030 | regcache = get_thread_regcache (ecs->event_thread->ptid); | |
527a273a | 6031 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6032 | if (decr_pc != 0) |
6033 | { | |
6034 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); | |
6035 | ||
6036 | if (record_full_is_used ()) | |
6037 | record_full_gdb_operation_disable_set (); | |
6038 | ||
6039 | regcache_write_pc (regcache, stop_pc + decr_pc); | |
6040 | ||
6041 | do_cleanups (old_cleanups); | |
6042 | } | |
6043 | } | |
6044 | else | |
6045 | { | |
6046 | /* A delayed software breakpoint event. Ignore the trap. */ | |
6047 | if (debug_infrun) | |
6048 | fprintf_unfiltered (gdb_stdlog, | |
6049 | "infrun: delayed software breakpoint " | |
6050 | "trap, ignoring\n"); | |
6051 | random_signal = 0; | |
6052 | } | |
6053 | } | |
6054 | ||
6055 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6056 | has since been removed. */ | |
6057 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6058 | { | |
6059 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
6060 | if (debug_infrun) | |
6061 | fprintf_unfiltered (gdb_stdlog, | |
6062 | "infrun: delayed hardware breakpoint/watchpoint " | |
6063 | "trap, ignoring\n"); | |
6064 | random_signal = 0; | |
6065 | } | |
6066 | ||
bac7d97b PA |
6067 | /* If not, perhaps stepping/nexting can. */ |
6068 | if (random_signal) | |
6069 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6070 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6071 | |
2adfaa28 PA |
6072 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6073 | thread. Single-step breakpoints are transparent to the | |
6074 | breakpoints module. */ | |
6075 | if (random_signal) | |
6076 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6077 | ||
bac7d97b PA |
6078 | /* No? Perhaps we got a moribund watchpoint. */ |
6079 | if (random_signal) | |
6080 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6081 | |
c65d6b55 PA |
6082 | /* Always stop if the user explicitly requested this thread to |
6083 | remain stopped. */ | |
6084 | if (ecs->event_thread->stop_requested) | |
6085 | { | |
6086 | random_signal = 1; | |
6087 | if (debug_infrun) | |
6088 | fprintf_unfiltered (gdb_stdlog, "infrun: user-requested stop\n"); | |
6089 | } | |
6090 | ||
488f131b JB |
6091 | /* For the program's own signals, act according to |
6092 | the signal handling tables. */ | |
6093 | ||
ce12b012 | 6094 | if (random_signal) |
488f131b JB |
6095 | { |
6096 | /* Signal not for debugging purposes. */ | |
c9657e70 | 6097 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
c9737c08 | 6098 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6099 | |
527159b7 | 6100 | if (debug_infrun) |
c9737c08 PA |
6101 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
6102 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6103 | |
488f131b JB |
6104 | stopped_by_random_signal = 1; |
6105 | ||
252fbfc8 PA |
6106 | /* Always stop on signals if we're either just gaining control |
6107 | of the program, or the user explicitly requested this thread | |
6108 | to remain stopped. */ | |
d6b48e9c | 6109 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6110 | || ecs->event_thread->stop_requested |
24291992 | 6111 | || (!inf->detaching |
16c381f0 | 6112 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 6113 | { |
22bcd14b | 6114 | stop_waiting (ecs); |
488f131b JB |
6115 | return; |
6116 | } | |
b57bacec PA |
6117 | |
6118 | /* Notify observers the signal has "handle print" set. Note we | |
6119 | returned early above if stopping; normal_stop handles the | |
6120 | printing in that case. */ | |
6121 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6122 | { | |
6123 | /* The signal table tells us to print about this signal. */ | |
6124 | target_terminal_ours_for_output (); | |
6125 | observer_notify_signal_received (ecs->event_thread->suspend.stop_signal); | |
6126 | target_terminal_inferior (); | |
6127 | } | |
488f131b JB |
6128 | |
6129 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6130 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6131 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6132 | |
fb14de7b | 6133 | if (ecs->event_thread->prev_pc == stop_pc |
16c381f0 | 6134 | && ecs->event_thread->control.trap_expected |
8358c15c | 6135 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6136 | { |
6137 | /* We were just starting a new sequence, attempting to | |
6138 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6139 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6140 | of the stepping range so GDB needs to remember to, when |
6141 | the signal handler returns, resume stepping off that | |
6142 | breakpoint. */ | |
6143 | /* To simplify things, "continue" is forced to use the same | |
6144 | code paths as single-step - set a breakpoint at the | |
6145 | signal return address and then, once hit, step off that | |
6146 | breakpoint. */ | |
237fc4c9 PA |
6147 | if (debug_infrun) |
6148 | fprintf_unfiltered (gdb_stdlog, | |
6149 | "infrun: signal arrived while stepping over " | |
6150 | "breakpoint\n"); | |
d3169d93 | 6151 | |
2c03e5be | 6152 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6153 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6154 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6155 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6156 | |
6157 | /* If we were nexting/stepping some other thread, switch to | |
6158 | it, so that we don't continue it, losing control. */ | |
6159 | if (!switch_back_to_stepped_thread (ecs)) | |
6160 | keep_going (ecs); | |
9d799f85 | 6161 | return; |
68f53502 | 6162 | } |
9d799f85 | 6163 | |
e5f8a7cc PA |
6164 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
6165 | && (pc_in_thread_step_range (stop_pc, ecs->event_thread) | |
6166 | || ecs->event_thread->control.step_range_end == 1) | |
edb3359d | 6167 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6168 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6169 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6170 | { |
6171 | /* The inferior is about to take a signal that will take it | |
6172 | out of the single step range. Set a breakpoint at the | |
6173 | current PC (which is presumably where the signal handler | |
6174 | will eventually return) and then allow the inferior to | |
6175 | run free. | |
6176 | ||
6177 | Note that this is only needed for a signal delivered | |
6178 | while in the single-step range. Nested signals aren't a | |
6179 | problem as they eventually all return. */ | |
237fc4c9 PA |
6180 | if (debug_infrun) |
6181 | fprintf_unfiltered (gdb_stdlog, | |
6182 | "infrun: signal may take us out of " | |
6183 | "single-step range\n"); | |
6184 | ||
372316f1 | 6185 | clear_step_over_info (); |
2c03e5be | 6186 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6187 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6188 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6189 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6190 | keep_going (ecs); |
6191 | return; | |
d303a6c7 | 6192 | } |
9d799f85 AC |
6193 | |
6194 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
6195 | when either there's a nested signal, or when there's a | |
6196 | pending signal enabled just as the signal handler returns | |
6197 | (leaving the inferior at the step-resume-breakpoint without | |
6198 | actually executing it). Either way continue until the | |
6199 | breakpoint is really hit. */ | |
c447ac0b PA |
6200 | |
6201 | if (!switch_back_to_stepped_thread (ecs)) | |
6202 | { | |
6203 | if (debug_infrun) | |
6204 | fprintf_unfiltered (gdb_stdlog, | |
6205 | "infrun: random signal, keep going\n"); | |
6206 | ||
6207 | keep_going (ecs); | |
6208 | } | |
6209 | return; | |
488f131b | 6210 | } |
94c57d6a PA |
6211 | |
6212 | process_event_stop_test (ecs); | |
6213 | } | |
6214 | ||
6215 | /* Come here when we've got some debug event / signal we can explain | |
6216 | (IOW, not a random signal), and test whether it should cause a | |
6217 | stop, or whether we should resume the inferior (transparently). | |
6218 | E.g., could be a breakpoint whose condition evaluates false; we | |
6219 | could be still stepping within the line; etc. */ | |
6220 | ||
6221 | static void | |
6222 | process_event_stop_test (struct execution_control_state *ecs) | |
6223 | { | |
6224 | struct symtab_and_line stop_pc_sal; | |
6225 | struct frame_info *frame; | |
6226 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6227 | CORE_ADDR jmp_buf_pc; |
6228 | struct bpstat_what what; | |
94c57d6a | 6229 | |
cdaa5b73 | 6230 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6231 | |
cdaa5b73 PA |
6232 | frame = get_current_frame (); |
6233 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6234 | |
cdaa5b73 | 6235 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6236 | |
cdaa5b73 PA |
6237 | if (what.call_dummy) |
6238 | { | |
6239 | stop_stack_dummy = what.call_dummy; | |
6240 | } | |
186c406b | 6241 | |
243a9253 PA |
6242 | /* A few breakpoint types have callbacks associated (e.g., |
6243 | bp_jit_event). Run them now. */ | |
6244 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6245 | ||
cdaa5b73 PA |
6246 | /* If we hit an internal event that triggers symbol changes, the |
6247 | current frame will be invalidated within bpstat_what (e.g., if we | |
6248 | hit an internal solib event). Re-fetch it. */ | |
6249 | frame = get_current_frame (); | |
6250 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6251 | |
cdaa5b73 PA |
6252 | switch (what.main_action) |
6253 | { | |
6254 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6255 | /* If we hit the breakpoint at longjmp while stepping, we | |
6256 | install a momentary breakpoint at the target of the | |
6257 | jmp_buf. */ | |
186c406b | 6258 | |
cdaa5b73 PA |
6259 | if (debug_infrun) |
6260 | fprintf_unfiltered (gdb_stdlog, | |
6261 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 6262 | |
cdaa5b73 | 6263 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6264 | |
cdaa5b73 PA |
6265 | if (what.is_longjmp) |
6266 | { | |
6267 | struct value *arg_value; | |
6268 | ||
6269 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6270 | then use it to extract the arguments. The destination PC | |
6271 | is the third argument to the probe. */ | |
6272 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6273 | if (arg_value) | |
8fa0c4f8 AA |
6274 | { |
6275 | jmp_buf_pc = value_as_address (arg_value); | |
6276 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6277 | } | |
cdaa5b73 PA |
6278 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6279 | || !gdbarch_get_longjmp_target (gdbarch, | |
6280 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6281 | { |
cdaa5b73 PA |
6282 | if (debug_infrun) |
6283 | fprintf_unfiltered (gdb_stdlog, | |
6284 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
6285 | "(!gdbarch_get_longjmp_target)\n"); | |
6286 | keep_going (ecs); | |
6287 | return; | |
e2e4d78b | 6288 | } |
e2e4d78b | 6289 | |
cdaa5b73 PA |
6290 | /* Insert a breakpoint at resume address. */ |
6291 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6292 | } | |
6293 | else | |
6294 | check_exception_resume (ecs, frame); | |
6295 | keep_going (ecs); | |
6296 | return; | |
e81a37f7 | 6297 | |
cdaa5b73 PA |
6298 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6299 | { | |
6300 | struct frame_info *init_frame; | |
e81a37f7 | 6301 | |
cdaa5b73 | 6302 | /* There are several cases to consider. |
c906108c | 6303 | |
cdaa5b73 PA |
6304 | 1. The initiating frame no longer exists. In this case we |
6305 | must stop, because the exception or longjmp has gone too | |
6306 | far. | |
2c03e5be | 6307 | |
cdaa5b73 PA |
6308 | 2. The initiating frame exists, and is the same as the |
6309 | current frame. We stop, because the exception or longjmp | |
6310 | has been caught. | |
2c03e5be | 6311 | |
cdaa5b73 PA |
6312 | 3. The initiating frame exists and is different from the |
6313 | current frame. This means the exception or longjmp has | |
6314 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6315 | |
cdaa5b73 PA |
6316 | 4. longjmp breakpoint has been placed just to protect |
6317 | against stale dummy frames and user is not interested in | |
6318 | stopping around longjmps. */ | |
c5aa993b | 6319 | |
cdaa5b73 PA |
6320 | if (debug_infrun) |
6321 | fprintf_unfiltered (gdb_stdlog, | |
6322 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 6323 | |
cdaa5b73 PA |
6324 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6325 | != NULL); | |
6326 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6327 | |
cdaa5b73 PA |
6328 | if (what.is_longjmp) |
6329 | { | |
b67a2c6f | 6330 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6331 | |
cdaa5b73 | 6332 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6333 | { |
cdaa5b73 PA |
6334 | /* Case 4. */ |
6335 | keep_going (ecs); | |
6336 | return; | |
e5ef252a | 6337 | } |
cdaa5b73 | 6338 | } |
c5aa993b | 6339 | |
cdaa5b73 | 6340 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6341 | |
cdaa5b73 PA |
6342 | if (init_frame) |
6343 | { | |
6344 | struct frame_id current_id | |
6345 | = get_frame_id (get_current_frame ()); | |
6346 | if (frame_id_eq (current_id, | |
6347 | ecs->event_thread->initiating_frame)) | |
6348 | { | |
6349 | /* Case 2. Fall through. */ | |
6350 | } | |
6351 | else | |
6352 | { | |
6353 | /* Case 3. */ | |
6354 | keep_going (ecs); | |
6355 | return; | |
6356 | } | |
68f53502 | 6357 | } |
488f131b | 6358 | |
cdaa5b73 PA |
6359 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6360 | exists. */ | |
6361 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6362 | |
bdc36728 | 6363 | end_stepping_range (ecs); |
cdaa5b73 PA |
6364 | } |
6365 | return; | |
e5ef252a | 6366 | |
cdaa5b73 PA |
6367 | case BPSTAT_WHAT_SINGLE: |
6368 | if (debug_infrun) | |
6369 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
6370 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6371 | /* Still need to check other stuff, at least the case where we | |
6372 | are stepping and step out of the right range. */ | |
6373 | break; | |
e5ef252a | 6374 | |
cdaa5b73 PA |
6375 | case BPSTAT_WHAT_STEP_RESUME: |
6376 | if (debug_infrun) | |
6377 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 6378 | |
cdaa5b73 PA |
6379 | delete_step_resume_breakpoint (ecs->event_thread); |
6380 | if (ecs->event_thread->control.proceed_to_finish | |
6381 | && execution_direction == EXEC_REVERSE) | |
6382 | { | |
6383 | struct thread_info *tp = ecs->event_thread; | |
6384 | ||
6385 | /* We are finishing a function in reverse, and just hit the | |
6386 | step-resume breakpoint at the start address of the | |
6387 | function, and we're almost there -- just need to back up | |
6388 | by one more single-step, which should take us back to the | |
6389 | function call. */ | |
6390 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6391 | keep_going (ecs); | |
e5ef252a | 6392 | return; |
cdaa5b73 PA |
6393 | } |
6394 | fill_in_stop_func (gdbarch, ecs); | |
6395 | if (stop_pc == ecs->stop_func_start | |
6396 | && execution_direction == EXEC_REVERSE) | |
6397 | { | |
6398 | /* We are stepping over a function call in reverse, and just | |
6399 | hit the step-resume breakpoint at the start address of | |
6400 | the function. Go back to single-stepping, which should | |
6401 | take us back to the function call. */ | |
6402 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6403 | keep_going (ecs); | |
6404 | return; | |
6405 | } | |
6406 | break; | |
e5ef252a | 6407 | |
cdaa5b73 PA |
6408 | case BPSTAT_WHAT_STOP_NOISY: |
6409 | if (debug_infrun) | |
6410 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
6411 | stop_print_frame = 1; | |
e5ef252a | 6412 | |
99619bea PA |
6413 | /* Assume the thread stopped for a breapoint. We'll still check |
6414 | whether a/the breakpoint is there when the thread is next | |
6415 | resumed. */ | |
6416 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6417 | |
22bcd14b | 6418 | stop_waiting (ecs); |
cdaa5b73 | 6419 | return; |
e5ef252a | 6420 | |
cdaa5b73 PA |
6421 | case BPSTAT_WHAT_STOP_SILENT: |
6422 | if (debug_infrun) | |
6423 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
6424 | stop_print_frame = 0; | |
e5ef252a | 6425 | |
99619bea PA |
6426 | /* Assume the thread stopped for a breapoint. We'll still check |
6427 | whether a/the breakpoint is there when the thread is next | |
6428 | resumed. */ | |
6429 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6430 | stop_waiting (ecs); |
cdaa5b73 PA |
6431 | return; |
6432 | ||
6433 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
6434 | if (debug_infrun) | |
6435 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
6436 | ||
6437 | delete_step_resume_breakpoint (ecs->event_thread); | |
6438 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6439 | { | |
6440 | /* Back when the step-resume breakpoint was inserted, we | |
6441 | were trying to single-step off a breakpoint. Go back to | |
6442 | doing that. */ | |
6443 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6444 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6445 | keep_going (ecs); | |
6446 | return; | |
e5ef252a | 6447 | } |
cdaa5b73 PA |
6448 | break; |
6449 | ||
6450 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6451 | break; | |
e5ef252a | 6452 | } |
c906108c | 6453 | |
af48d08f PA |
6454 | /* If we stepped a permanent breakpoint and we had a high priority |
6455 | step-resume breakpoint for the address we stepped, but we didn't | |
6456 | hit it, then we must have stepped into the signal handler. The | |
6457 | step-resume was only necessary to catch the case of _not_ | |
6458 | stepping into the handler, so delete it, and fall through to | |
6459 | checking whether the step finished. */ | |
6460 | if (ecs->event_thread->stepped_breakpoint) | |
6461 | { | |
6462 | struct breakpoint *sr_bp | |
6463 | = ecs->event_thread->control.step_resume_breakpoint; | |
6464 | ||
8d707a12 PA |
6465 | if (sr_bp != NULL |
6466 | && sr_bp->loc->permanent | |
af48d08f PA |
6467 | && sr_bp->type == bp_hp_step_resume |
6468 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6469 | { | |
6470 | if (debug_infrun) | |
6471 | fprintf_unfiltered (gdb_stdlog, | |
6472 | "infrun: stepped permanent breakpoint, stopped in " | |
6473 | "handler\n"); | |
6474 | delete_step_resume_breakpoint (ecs->event_thread); | |
6475 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6476 | } | |
6477 | } | |
6478 | ||
cdaa5b73 PA |
6479 | /* We come here if we hit a breakpoint but should not stop for it. |
6480 | Possibly we also were stepping and should stop for that. So fall | |
6481 | through and test for stepping. But, if not stepping, do not | |
6482 | stop. */ | |
c906108c | 6483 | |
a7212384 UW |
6484 | /* In all-stop mode, if we're currently stepping but have stopped in |
6485 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6486 | if (switch_back_to_stepped_thread (ecs)) |
6487 | return; | |
776f04fa | 6488 | |
8358c15c | 6489 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6490 | { |
527159b7 | 6491 | if (debug_infrun) |
d3169d93 DJ |
6492 | fprintf_unfiltered (gdb_stdlog, |
6493 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 6494 | |
488f131b JB |
6495 | /* Having a step-resume breakpoint overrides anything |
6496 | else having to do with stepping commands until | |
6497 | that breakpoint is reached. */ | |
488f131b JB |
6498 | keep_going (ecs); |
6499 | return; | |
6500 | } | |
c5aa993b | 6501 | |
16c381f0 | 6502 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6503 | { |
527159b7 | 6504 | if (debug_infrun) |
8a9de0e4 | 6505 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 6506 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6507 | keep_going (ecs); |
6508 | return; | |
6509 | } | |
c5aa993b | 6510 | |
4b7703ad JB |
6511 | /* Re-fetch current thread's frame in case the code above caused |
6512 | the frame cache to be re-initialized, making our FRAME variable | |
6513 | a dangling pointer. */ | |
6514 | frame = get_current_frame (); | |
628fe4e4 | 6515 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6516 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6517 | |
488f131b | 6518 | /* If stepping through a line, keep going if still within it. |
c906108c | 6519 | |
488f131b JB |
6520 | Note that step_range_end is the address of the first instruction |
6521 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6522 | within it! |
6523 | ||
6524 | Note also that during reverse execution, we may be stepping | |
6525 | through a function epilogue and therefore must detect when | |
6526 | the current-frame changes in the middle of a line. */ | |
6527 | ||
ce4c476a | 6528 | if (pc_in_thread_step_range (stop_pc, ecs->event_thread) |
31410e84 | 6529 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6530 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6531 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6532 | { |
527159b7 | 6533 | if (debug_infrun) |
5af949e3 UW |
6534 | fprintf_unfiltered |
6535 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
6536 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
6537 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6538 | |
c1e36e3e PA |
6539 | /* Tentatively re-enable range stepping; `resume' disables it if |
6540 | necessary (e.g., if we're stepping over a breakpoint or we | |
6541 | have software watchpoints). */ | |
6542 | ecs->event_thread->control.may_range_step = 1; | |
6543 | ||
b2175913 MS |
6544 | /* When stepping backward, stop at beginning of line range |
6545 | (unless it's the function entry point, in which case | |
6546 | keep going back to the call point). */ | |
16c381f0 | 6547 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6548 | && stop_pc != ecs->stop_func_start |
6549 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6550 | end_stepping_range (ecs); |
b2175913 MS |
6551 | else |
6552 | keep_going (ecs); | |
6553 | ||
488f131b JB |
6554 | return; |
6555 | } | |
c5aa993b | 6556 | |
488f131b | 6557 | /* We stepped out of the stepping range. */ |
c906108c | 6558 | |
488f131b | 6559 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6560 | loader dynamic symbol resolution code... |
6561 | ||
6562 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6563 | time loader code and reach the callee's address. | |
6564 | ||
6565 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6566 | the runtime loader code is handled just like any other | |
6567 | undebuggable function call. Now we need only keep stepping | |
6568 | backward through the trampoline code, and that's handled further | |
6569 | down, so there is nothing for us to do here. */ | |
6570 | ||
6571 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6572 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
cfd8ab24 | 6573 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 6574 | { |
4c8c40e6 | 6575 | CORE_ADDR pc_after_resolver = |
568d6575 | 6576 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); |
c906108c | 6577 | |
527159b7 | 6578 | if (debug_infrun) |
3e43a32a MS |
6579 | fprintf_unfiltered (gdb_stdlog, |
6580 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 6581 | |
488f131b JB |
6582 | if (pc_after_resolver) |
6583 | { | |
6584 | /* Set up a step-resume breakpoint at the address | |
6585 | indicated by SKIP_SOLIB_RESOLVER. */ | |
6586 | struct symtab_and_line sr_sal; | |
abbb1732 | 6587 | |
fe39c653 | 6588 | init_sal (&sr_sal); |
488f131b | 6589 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6590 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6591 | |
a6d9a66e UW |
6592 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6593 | sr_sal, null_frame_id); | |
c5aa993b | 6594 | } |
c906108c | 6595 | |
488f131b JB |
6596 | keep_going (ecs); |
6597 | return; | |
6598 | } | |
c906108c | 6599 | |
16c381f0 JK |
6600 | if (ecs->event_thread->control.step_range_end != 1 |
6601 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6602 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6603 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6604 | { |
527159b7 | 6605 | if (debug_infrun) |
3e43a32a MS |
6606 | fprintf_unfiltered (gdb_stdlog, |
6607 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 6608 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6609 | a signal trampoline (either by a signal being delivered or by |
6610 | the signal handler returning). Just single-step until the | |
6611 | inferior leaves the trampoline (either by calling the handler | |
6612 | or returning). */ | |
488f131b JB |
6613 | keep_going (ecs); |
6614 | return; | |
6615 | } | |
c906108c | 6616 | |
14132e89 MR |
6617 | /* If we're in the return path from a shared library trampoline, |
6618 | we want to proceed through the trampoline when stepping. */ | |
6619 | /* macro/2012-04-25: This needs to come before the subroutine | |
6620 | call check below as on some targets return trampolines look | |
6621 | like subroutine calls (MIPS16 return thunks). */ | |
6622 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
6623 | stop_pc, ecs->stop_func_name) | |
6624 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) | |
6625 | { | |
6626 | /* Determine where this trampoline returns. */ | |
6627 | CORE_ADDR real_stop_pc; | |
6628 | ||
6629 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
6630 | ||
6631 | if (debug_infrun) | |
6632 | fprintf_unfiltered (gdb_stdlog, | |
6633 | "infrun: stepped into solib return tramp\n"); | |
6634 | ||
6635 | /* Only proceed through if we know where it's going. */ | |
6636 | if (real_stop_pc) | |
6637 | { | |
6638 | /* And put the step-breakpoint there and go until there. */ | |
6639 | struct symtab_and_line sr_sal; | |
6640 | ||
6641 | init_sal (&sr_sal); /* initialize to zeroes */ | |
6642 | sr_sal.pc = real_stop_pc; | |
6643 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6644 | sr_sal.pspace = get_frame_program_space (frame); | |
6645 | ||
6646 | /* Do not specify what the fp should be when we stop since | |
6647 | on some machines the prologue is where the new fp value | |
6648 | is established. */ | |
6649 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6650 | sr_sal, null_frame_id); | |
6651 | ||
6652 | /* Restart without fiddling with the step ranges or | |
6653 | other state. */ | |
6654 | keep_going (ecs); | |
6655 | return; | |
6656 | } | |
6657 | } | |
6658 | ||
c17eaafe DJ |
6659 | /* Check for subroutine calls. The check for the current frame |
6660 | equalling the step ID is not necessary - the check of the | |
6661 | previous frame's ID is sufficient - but it is a common case and | |
6662 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6663 | |
6664 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6665 | being equal, so to get into this block, both the current and | |
6666 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6667 | /* The outer_frame_id check is a heuristic to detect stepping |
6668 | through startup code. If we step over an instruction which | |
6669 | sets the stack pointer from an invalid value to a valid value, | |
6670 | we may detect that as a subroutine call from the mythical | |
6671 | "outermost" function. This could be fixed by marking | |
6672 | outermost frames as !stack_p,code_p,special_p. Then the | |
6673 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6674 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6675 | for more. */ |
edb3359d | 6676 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6677 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6678 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6679 | ecs->event_thread->control.step_stack_frame_id) |
6680 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6681 | outer_frame_id) |
885eeb5b PA |
6682 | || (ecs->event_thread->control.step_start_function |
6683 | != find_pc_function (stop_pc))))) | |
488f131b | 6684 | { |
95918acb | 6685 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6686 | |
527159b7 | 6687 | if (debug_infrun) |
8a9de0e4 | 6688 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 6689 | |
b7a084be | 6690 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6691 | { |
6692 | /* I presume that step_over_calls is only 0 when we're | |
6693 | supposed to be stepping at the assembly language level | |
6694 | ("stepi"). Just stop. */ | |
388a8562 | 6695 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6696 | end_stepping_range (ecs); |
95918acb AC |
6697 | return; |
6698 | } | |
8fb3e588 | 6699 | |
388a8562 MS |
6700 | /* Reverse stepping through solib trampolines. */ |
6701 | ||
6702 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6703 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6704 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6705 | || (ecs->stop_func_start == 0 | |
6706 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6707 | { | |
6708 | /* Any solib trampoline code can be handled in reverse | |
6709 | by simply continuing to single-step. We have already | |
6710 | executed the solib function (backwards), and a few | |
6711 | steps will take us back through the trampoline to the | |
6712 | caller. */ | |
6713 | keep_going (ecs); | |
6714 | return; | |
6715 | } | |
6716 | ||
16c381f0 | 6717 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6718 | { |
b2175913 MS |
6719 | /* We're doing a "next". |
6720 | ||
6721 | Normal (forward) execution: set a breakpoint at the | |
6722 | callee's return address (the address at which the caller | |
6723 | will resume). | |
6724 | ||
6725 | Reverse (backward) execution. set the step-resume | |
6726 | breakpoint at the start of the function that we just | |
6727 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6728 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6729 | |
6730 | if (execution_direction == EXEC_REVERSE) | |
6731 | { | |
acf9414f JK |
6732 | /* If we're already at the start of the function, we've either |
6733 | just stepped backward into a single instruction function, | |
6734 | or stepped back out of a signal handler to the first instruction | |
6735 | of the function. Just keep going, which will single-step back | |
6736 | to the caller. */ | |
58c48e72 | 6737 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f JK |
6738 | { |
6739 | struct symtab_and_line sr_sal; | |
6740 | ||
6741 | /* Normal function call return (static or dynamic). */ | |
6742 | init_sal (&sr_sal); | |
6743 | sr_sal.pc = ecs->stop_func_start; | |
6744 | sr_sal.pspace = get_frame_program_space (frame); | |
6745 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6746 | sr_sal, null_frame_id); | |
6747 | } | |
b2175913 MS |
6748 | } |
6749 | else | |
568d6575 | 6750 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6751 | |
8567c30f AC |
6752 | keep_going (ecs); |
6753 | return; | |
6754 | } | |
a53c66de | 6755 | |
95918acb | 6756 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6757 | calling routine and the real function), locate the real |
6758 | function. That's what tells us (a) whether we want to step | |
6759 | into it at all, and (b) what prologue we want to run to the | |
6760 | end of, if we do step into it. */ | |
568d6575 | 6761 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6762 | if (real_stop_pc == 0) |
568d6575 | 6763 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6764 | if (real_stop_pc != 0) |
6765 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6766 | |
db5f024e | 6767 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 RC |
6768 | { |
6769 | struct symtab_and_line sr_sal; | |
abbb1732 | 6770 | |
1b2bfbb9 RC |
6771 | init_sal (&sr_sal); |
6772 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 6773 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6774 | |
a6d9a66e UW |
6775 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6776 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6777 | keep_going (ecs); |
6778 | return; | |
1b2bfbb9 RC |
6779 | } |
6780 | ||
95918acb | 6781 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6782 | thinking of stepping into and the function isn't on the skip |
6783 | list, step into it. | |
95918acb | 6784 | |
8fb3e588 AC |
6785 | If there are several symtabs at that PC (e.g. with include |
6786 | files), just want to know whether *any* of them have line | |
6787 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6788 | { |
6789 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6790 | |
95918acb | 6791 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6792 | if (tmp_sal.line != 0 |
85817405 JK |
6793 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
6794 | &tmp_sal)) | |
95918acb | 6795 | { |
b2175913 | 6796 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6797 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6798 | else |
568d6575 | 6799 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6800 | return; |
6801 | } | |
6802 | } | |
6803 | ||
6804 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6805 | set, we stop the step so that the user has a chance to switch |
6806 | in assembly mode. */ | |
16c381f0 | 6807 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6808 | && step_stop_if_no_debug) |
95918acb | 6809 | { |
bdc36728 | 6810 | end_stepping_range (ecs); |
95918acb AC |
6811 | return; |
6812 | } | |
6813 | ||
b2175913 MS |
6814 | if (execution_direction == EXEC_REVERSE) |
6815 | { | |
acf9414f JK |
6816 | /* If we're already at the start of the function, we've either just |
6817 | stepped backward into a single instruction function without line | |
6818 | number info, or stepped back out of a signal handler to the first | |
6819 | instruction of the function without line number info. Just keep | |
6820 | going, which will single-step back to the caller. */ | |
6821 | if (ecs->stop_func_start != stop_pc) | |
6822 | { | |
6823 | /* Set a breakpoint at callee's start address. | |
6824 | From there we can step once and be back in the caller. */ | |
6825 | struct symtab_and_line sr_sal; | |
abbb1732 | 6826 | |
acf9414f JK |
6827 | init_sal (&sr_sal); |
6828 | sr_sal.pc = ecs->stop_func_start; | |
6829 | sr_sal.pspace = get_frame_program_space (frame); | |
6830 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6831 | sr_sal, null_frame_id); | |
6832 | } | |
b2175913 MS |
6833 | } |
6834 | else | |
6835 | /* Set a breakpoint at callee's return address (the address | |
6836 | at which the caller will resume). */ | |
568d6575 | 6837 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6838 | |
95918acb | 6839 | keep_going (ecs); |
488f131b | 6840 | return; |
488f131b | 6841 | } |
c906108c | 6842 | |
fdd654f3 MS |
6843 | /* Reverse stepping through solib trampolines. */ |
6844 | ||
6845 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6846 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 MS |
6847 | { |
6848 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
6849 | || (ecs->stop_func_start == 0 | |
6850 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6851 | { | |
6852 | /* Any solib trampoline code can be handled in reverse | |
6853 | by simply continuing to single-step. We have already | |
6854 | executed the solib function (backwards), and a few | |
6855 | steps will take us back through the trampoline to the | |
6856 | caller. */ | |
6857 | keep_going (ecs); | |
6858 | return; | |
6859 | } | |
6860 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6861 | { | |
6862 | /* Stepped backward into the solib dynsym resolver. | |
6863 | Set a breakpoint at its start and continue, then | |
6864 | one more step will take us out. */ | |
6865 | struct symtab_and_line sr_sal; | |
abbb1732 | 6866 | |
fdd654f3 MS |
6867 | init_sal (&sr_sal); |
6868 | sr_sal.pc = ecs->stop_func_start; | |
9d1807c3 | 6869 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6870 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6871 | sr_sal, null_frame_id); | |
6872 | keep_going (ecs); | |
6873 | return; | |
6874 | } | |
6875 | } | |
6876 | ||
2afb61aa | 6877 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 6878 | |
1b2bfbb9 RC |
6879 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6880 | the trampoline processing logic, however, there are some trampolines | |
6881 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6882 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6883 | && ecs->stop_func_name == NULL |
2afb61aa | 6884 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6885 | { |
527159b7 | 6886 | if (debug_infrun) |
3e43a32a MS |
6887 | fprintf_unfiltered (gdb_stdlog, |
6888 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 6889 | |
1b2bfbb9 | 6890 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6891 | undebuggable function (where there is no debugging information |
6892 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6893 | inferior stopped). Since we want to skip this kind of code, |
6894 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6895 | function - unless the user has asked us not to (via |
6896 | set step-mode) or we no longer know how to get back | |
6897 | to the call site. */ | |
6898 | if (step_stop_if_no_debug | |
c7ce8faa | 6899 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6900 | { |
6901 | /* If we have no line number and the step-stop-if-no-debug | |
6902 | is set, we stop the step so that the user has a chance to | |
6903 | switch in assembly mode. */ | |
bdc36728 | 6904 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6905 | return; |
6906 | } | |
6907 | else | |
6908 | { | |
6909 | /* Set a breakpoint at callee's return address (the address | |
6910 | at which the caller will resume). */ | |
568d6575 | 6911 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6912 | keep_going (ecs); |
6913 | return; | |
6914 | } | |
6915 | } | |
6916 | ||
16c381f0 | 6917 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6918 | { |
6919 | /* It is stepi or nexti. We always want to stop stepping after | |
6920 | one instruction. */ | |
527159b7 | 6921 | if (debug_infrun) |
8a9de0e4 | 6922 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 6923 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6924 | return; |
6925 | } | |
6926 | ||
2afb61aa | 6927 | if (stop_pc_sal.line == 0) |
488f131b JB |
6928 | { |
6929 | /* We have no line number information. That means to stop | |
6930 | stepping (does this always happen right after one instruction, | |
6931 | when we do "s" in a function with no line numbers, | |
6932 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 6933 | if (debug_infrun) |
8a9de0e4 | 6934 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 6935 | end_stepping_range (ecs); |
488f131b JB |
6936 | return; |
6937 | } | |
c906108c | 6938 | |
edb3359d DJ |
6939 | /* Look for "calls" to inlined functions, part one. If the inline |
6940 | frame machinery detected some skipped call sites, we have entered | |
6941 | a new inline function. */ | |
6942 | ||
6943 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6944 | ecs->event_thread->control.step_frame_id) |
edb3359d DJ |
6945 | && inline_skipped_frames (ecs->ptid)) |
6946 | { | |
6947 | struct symtab_and_line call_sal; | |
6948 | ||
6949 | if (debug_infrun) | |
6950 | fprintf_unfiltered (gdb_stdlog, | |
6951 | "infrun: stepped into inlined function\n"); | |
6952 | ||
6953 | find_frame_sal (get_current_frame (), &call_sal); | |
6954 | ||
16c381f0 | 6955 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
6956 | { |
6957 | /* For "step", we're going to stop. But if the call site | |
6958 | for this inlined function is on the same source line as | |
6959 | we were previously stepping, go down into the function | |
6960 | first. Otherwise stop at the call site. */ | |
6961 | ||
6962 | if (call_sal.line == ecs->event_thread->current_line | |
6963 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6964 | step_into_inline_frame (ecs->ptid); | |
6965 | ||
bdc36728 | 6966 | end_stepping_range (ecs); |
edb3359d DJ |
6967 | return; |
6968 | } | |
6969 | else | |
6970 | { | |
6971 | /* For "next", we should stop at the call site if it is on a | |
6972 | different source line. Otherwise continue through the | |
6973 | inlined function. */ | |
6974 | if (call_sal.line == ecs->event_thread->current_line | |
6975 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6976 | keep_going (ecs); | |
6977 | else | |
bdc36728 | 6978 | end_stepping_range (ecs); |
edb3359d DJ |
6979 | return; |
6980 | } | |
6981 | } | |
6982 | ||
6983 | /* Look for "calls" to inlined functions, part two. If we are still | |
6984 | in the same real function we were stepping through, but we have | |
6985 | to go further up to find the exact frame ID, we are stepping | |
6986 | through a more inlined call beyond its call site. */ | |
6987 | ||
6988 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
6989 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6990 | ecs->event_thread->control.step_frame_id) |
edb3359d | 6991 | && stepped_in_from (get_current_frame (), |
16c381f0 | 6992 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
6993 | { |
6994 | if (debug_infrun) | |
6995 | fprintf_unfiltered (gdb_stdlog, | |
6996 | "infrun: stepping through inlined function\n"); | |
6997 | ||
16c381f0 | 6998 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
6999 | keep_going (ecs); |
7000 | else | |
bdc36728 | 7001 | end_stepping_range (ecs); |
edb3359d DJ |
7002 | return; |
7003 | } | |
7004 | ||
2afb61aa | 7005 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
7006 | && (ecs->event_thread->current_line != stop_pc_sal.line |
7007 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
7008 | { |
7009 | /* We are at the start of a different line. So stop. Note that | |
7010 | we don't stop if we step into the middle of a different line. | |
7011 | That is said to make things like for (;;) statements work | |
7012 | better. */ | |
527159b7 | 7013 | if (debug_infrun) |
3e43a32a MS |
7014 | fprintf_unfiltered (gdb_stdlog, |
7015 | "infrun: stepped to a different line\n"); | |
bdc36728 | 7016 | end_stepping_range (ecs); |
488f131b JB |
7017 | return; |
7018 | } | |
c906108c | 7019 | |
488f131b | 7020 | /* We aren't done stepping. |
c906108c | 7021 | |
488f131b JB |
7022 | Optimize by setting the stepping range to the line. |
7023 | (We might not be in the original line, but if we entered a | |
7024 | new line in mid-statement, we continue stepping. This makes | |
7025 | things like for(;;) statements work better.) */ | |
c906108c | 7026 | |
16c381f0 JK |
7027 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7028 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7029 | ecs->event_thread->control.may_range_step = 1; |
edb3359d | 7030 | set_step_info (frame, stop_pc_sal); |
488f131b | 7031 | |
527159b7 | 7032 | if (debug_infrun) |
8a9de0e4 | 7033 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 7034 | keep_going (ecs); |
104c1213 JM |
7035 | } |
7036 | ||
c447ac0b PA |
7037 | /* In all-stop mode, if we're currently stepping but have stopped in |
7038 | some other thread, we may need to switch back to the stepped | |
7039 | thread. Returns true we set the inferior running, false if we left | |
7040 | it stopped (and the event needs further processing). */ | |
7041 | ||
7042 | static int | |
7043 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
7044 | { | |
fbea99ea | 7045 | if (!target_is_non_stop_p ()) |
c447ac0b PA |
7046 | { |
7047 | struct thread_info *tp; | |
99619bea PA |
7048 | struct thread_info *stepping_thread; |
7049 | ||
7050 | /* If any thread is blocked on some internal breakpoint, and we | |
7051 | simply need to step over that breakpoint to get it going | |
7052 | again, do that first. */ | |
7053 | ||
7054 | /* However, if we see an event for the stepping thread, then we | |
7055 | know all other threads have been moved past their breakpoints | |
7056 | already. Let the caller check whether the step is finished, | |
7057 | etc., before deciding to move it past a breakpoint. */ | |
7058 | if (ecs->event_thread->control.step_range_end != 0) | |
7059 | return 0; | |
7060 | ||
7061 | /* Check if the current thread is blocked on an incomplete | |
7062 | step-over, interrupted by a random signal. */ | |
7063 | if (ecs->event_thread->control.trap_expected | |
7064 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7065 | { |
99619bea PA |
7066 | if (debug_infrun) |
7067 | { | |
7068 | fprintf_unfiltered (gdb_stdlog, | |
7069 | "infrun: need to finish step-over of [%s]\n", | |
7070 | target_pid_to_str (ecs->event_thread->ptid)); | |
7071 | } | |
7072 | keep_going (ecs); | |
7073 | return 1; | |
7074 | } | |
2adfaa28 | 7075 | |
99619bea PA |
7076 | /* Check if the current thread is blocked by a single-step |
7077 | breakpoint of another thread. */ | |
7078 | if (ecs->hit_singlestep_breakpoint) | |
7079 | { | |
7080 | if (debug_infrun) | |
7081 | { | |
7082 | fprintf_unfiltered (gdb_stdlog, | |
7083 | "infrun: need to step [%s] over single-step " | |
7084 | "breakpoint\n", | |
7085 | target_pid_to_str (ecs->ptid)); | |
7086 | } | |
7087 | keep_going (ecs); | |
7088 | return 1; | |
7089 | } | |
7090 | ||
4d9d9d04 PA |
7091 | /* If this thread needs yet another step-over (e.g., stepping |
7092 | through a delay slot), do it first before moving on to | |
7093 | another thread. */ | |
7094 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7095 | { | |
7096 | if (debug_infrun) | |
7097 | { | |
7098 | fprintf_unfiltered (gdb_stdlog, | |
7099 | "infrun: thread [%s] still needs step-over\n", | |
7100 | target_pid_to_str (ecs->event_thread->ptid)); | |
7101 | } | |
7102 | keep_going (ecs); | |
7103 | return 1; | |
7104 | } | |
70509625 | 7105 | |
483805cf PA |
7106 | /* If scheduler locking applies even if not stepping, there's no |
7107 | need to walk over threads. Above we've checked whether the | |
7108 | current thread is stepping. If some other thread not the | |
7109 | event thread is stepping, then it must be that scheduler | |
7110 | locking is not in effect. */ | |
856e7dd6 | 7111 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
7112 | return 0; |
7113 | ||
4d9d9d04 PA |
7114 | /* Otherwise, we no longer expect a trap in the current thread. |
7115 | Clear the trap_expected flag before switching back -- this is | |
7116 | what keep_going does as well, if we call it. */ | |
7117 | ecs->event_thread->control.trap_expected = 0; | |
7118 | ||
7119 | /* Likewise, clear the signal if it should not be passed. */ | |
7120 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7121 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7122 | ||
7123 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 7124 | step/next/etc. */ |
4d9d9d04 PA |
7125 | if (start_step_over ()) |
7126 | { | |
7127 | prepare_to_wait (ecs); | |
7128 | return 1; | |
7129 | } | |
7130 | ||
7131 | /* Look for the stepping/nexting thread. */ | |
483805cf | 7132 | stepping_thread = NULL; |
4d9d9d04 | 7133 | |
034f788c | 7134 | ALL_NON_EXITED_THREADS (tp) |
483805cf | 7135 | { |
fbea99ea PA |
7136 | /* Ignore threads of processes the caller is not |
7137 | resuming. */ | |
483805cf | 7138 | if (!sched_multi |
1afd5965 | 7139 | && ptid_get_pid (tp->ptid) != ptid_get_pid (ecs->ptid)) |
483805cf PA |
7140 | continue; |
7141 | ||
7142 | /* When stepping over a breakpoint, we lock all threads | |
7143 | except the one that needs to move past the breakpoint. | |
7144 | If a non-event thread has this set, the "incomplete | |
7145 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
7146 | if (tp->control.trap_expected) |
7147 | { | |
7148 | internal_error (__FILE__, __LINE__, | |
7149 | "[%s] has inconsistent state: " | |
7150 | "trap_expected=%d\n", | |
7151 | target_pid_to_str (tp->ptid), | |
7152 | tp->control.trap_expected); | |
7153 | } | |
483805cf PA |
7154 | |
7155 | /* Did we find the stepping thread? */ | |
7156 | if (tp->control.step_range_end) | |
7157 | { | |
7158 | /* Yep. There should only one though. */ | |
7159 | gdb_assert (stepping_thread == NULL); | |
7160 | ||
7161 | /* The event thread is handled at the top, before we | |
7162 | enter this loop. */ | |
7163 | gdb_assert (tp != ecs->event_thread); | |
7164 | ||
7165 | /* If some thread other than the event thread is | |
7166 | stepping, then scheduler locking can't be in effect, | |
7167 | otherwise we wouldn't have resumed the current event | |
7168 | thread in the first place. */ | |
856e7dd6 | 7169 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
7170 | |
7171 | stepping_thread = tp; | |
7172 | } | |
99619bea PA |
7173 | } |
7174 | ||
483805cf | 7175 | if (stepping_thread != NULL) |
99619bea | 7176 | { |
c447ac0b PA |
7177 | if (debug_infrun) |
7178 | fprintf_unfiltered (gdb_stdlog, | |
7179 | "infrun: switching back to stepped thread\n"); | |
7180 | ||
2ac7589c PA |
7181 | if (keep_going_stepped_thread (stepping_thread)) |
7182 | { | |
7183 | prepare_to_wait (ecs); | |
7184 | return 1; | |
7185 | } | |
7186 | } | |
7187 | } | |
2adfaa28 | 7188 | |
2ac7589c PA |
7189 | return 0; |
7190 | } | |
2adfaa28 | 7191 | |
2ac7589c PA |
7192 | /* Set a previously stepped thread back to stepping. Returns true on |
7193 | success, false if the resume is not possible (e.g., the thread | |
7194 | vanished). */ | |
7195 | ||
7196 | static int | |
7197 | keep_going_stepped_thread (struct thread_info *tp) | |
7198 | { | |
7199 | struct frame_info *frame; | |
2ac7589c PA |
7200 | struct execution_control_state ecss; |
7201 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7202 | |
2ac7589c PA |
7203 | /* If the stepping thread exited, then don't try to switch back and |
7204 | resume it, which could fail in several different ways depending | |
7205 | on the target. Instead, just keep going. | |
2adfaa28 | 7206 | |
2ac7589c PA |
7207 | We can find a stepping dead thread in the thread list in two |
7208 | cases: | |
2adfaa28 | 7209 | |
2ac7589c PA |
7210 | - The target supports thread exit events, and when the target |
7211 | tries to delete the thread from the thread list, inferior_ptid | |
7212 | pointed at the exiting thread. In such case, calling | |
7213 | delete_thread does not really remove the thread from the list; | |
7214 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7215 | |
2ac7589c PA |
7216 | - The target's debug interface does not support thread exit |
7217 | events, and so we have no idea whatsoever if the previously | |
7218 | stepping thread is still alive. For that reason, we need to | |
7219 | synchronously query the target now. */ | |
2adfaa28 | 7220 | |
2ac7589c PA |
7221 | if (is_exited (tp->ptid) |
7222 | || !target_thread_alive (tp->ptid)) | |
7223 | { | |
7224 | if (debug_infrun) | |
7225 | fprintf_unfiltered (gdb_stdlog, | |
7226 | "infrun: not resuming previously " | |
7227 | "stepped thread, it has vanished\n"); | |
7228 | ||
7229 | delete_thread (tp->ptid); | |
7230 | return 0; | |
c447ac0b | 7231 | } |
2ac7589c PA |
7232 | |
7233 | if (debug_infrun) | |
7234 | fprintf_unfiltered (gdb_stdlog, | |
7235 | "infrun: resuming previously stepped thread\n"); | |
7236 | ||
7237 | reset_ecs (ecs, tp); | |
7238 | switch_to_thread (tp->ptid); | |
7239 | ||
7240 | stop_pc = regcache_read_pc (get_thread_regcache (tp->ptid)); | |
7241 | frame = get_current_frame (); | |
2ac7589c PA |
7242 | |
7243 | /* If the PC of the thread we were trying to single-step has | |
7244 | changed, then that thread has trapped or been signaled, but the | |
7245 | event has not been reported to GDB yet. Re-poll the target | |
7246 | looking for this particular thread's event (i.e. temporarily | |
7247 | enable schedlock) by: | |
7248 | ||
7249 | - setting a break at the current PC | |
7250 | - resuming that particular thread, only (by setting trap | |
7251 | expected) | |
7252 | ||
7253 | This prevents us continuously moving the single-step breakpoint | |
7254 | forward, one instruction at a time, overstepping. */ | |
7255 | ||
7256 | if (stop_pc != tp->prev_pc) | |
7257 | { | |
7258 | ptid_t resume_ptid; | |
7259 | ||
7260 | if (debug_infrun) | |
7261 | fprintf_unfiltered (gdb_stdlog, | |
7262 | "infrun: expected thread advanced also (%s -> %s)\n", | |
7263 | paddress (target_gdbarch (), tp->prev_pc), | |
7264 | paddress (target_gdbarch (), stop_pc)); | |
7265 | ||
7266 | /* Clear the info of the previous step-over, as it's no longer | |
7267 | valid (if the thread was trying to step over a breakpoint, it | |
7268 | has already succeeded). It's what keep_going would do too, | |
7269 | if we called it. Do this before trying to insert the sss | |
7270 | breakpoint, otherwise if we were previously trying to step | |
7271 | over this exact address in another thread, the breakpoint is | |
7272 | skipped. */ | |
7273 | clear_step_over_info (); | |
7274 | tp->control.trap_expected = 0; | |
7275 | ||
7276 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7277 | get_frame_address_space (frame), | |
7278 | stop_pc); | |
7279 | ||
372316f1 | 7280 | tp->resumed = 1; |
fbea99ea | 7281 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7282 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7283 | } | |
7284 | else | |
7285 | { | |
7286 | if (debug_infrun) | |
7287 | fprintf_unfiltered (gdb_stdlog, | |
7288 | "infrun: expected thread still hasn't advanced\n"); | |
7289 | ||
7290 | keep_going_pass_signal (ecs); | |
7291 | } | |
7292 | return 1; | |
c447ac0b PA |
7293 | } |
7294 | ||
8b061563 PA |
7295 | /* Is thread TP in the middle of (software or hardware) |
7296 | single-stepping? (Note the result of this function must never be | |
7297 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7298 | |
a289b8f6 | 7299 | static int |
b3444185 | 7300 | currently_stepping (struct thread_info *tp) |
a7212384 | 7301 | { |
8358c15c JK |
7302 | return ((tp->control.step_range_end |
7303 | && tp->control.step_resume_breakpoint == NULL) | |
7304 | || tp->control.trap_expected | |
af48d08f | 7305 | || tp->stepped_breakpoint |
8358c15c | 7306 | || bpstat_should_step ()); |
a7212384 UW |
7307 | } |
7308 | ||
b2175913 MS |
7309 | /* Inferior has stepped into a subroutine call with source code that |
7310 | we should not step over. Do step to the first line of code in | |
7311 | it. */ | |
c2c6d25f JM |
7312 | |
7313 | static void | |
568d6575 UW |
7314 | handle_step_into_function (struct gdbarch *gdbarch, |
7315 | struct execution_control_state *ecs) | |
c2c6d25f | 7316 | { |
43f3e411 | 7317 | struct compunit_symtab *cust; |
2afb61aa | 7318 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f | 7319 | |
7e324e48 GB |
7320 | fill_in_stop_func (gdbarch, ecs); |
7321 | ||
43f3e411 DE |
7322 | cust = find_pc_compunit_symtab (stop_pc); |
7323 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 7324 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 | 7325 | ecs->stop_func_start); |
c2c6d25f | 7326 | |
2afb61aa | 7327 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7328 | /* Use the step_resume_break to step until the end of the prologue, |
7329 | even if that involves jumps (as it seems to on the vax under | |
7330 | 4.2). */ | |
7331 | /* If the prologue ends in the middle of a source line, continue to | |
7332 | the end of that source line (if it is still within the function). | |
7333 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7334 | if (stop_func_sal.end |
7335 | && stop_func_sal.pc != ecs->stop_func_start | |
7336 | && stop_func_sal.end < ecs->stop_func_end) | |
7337 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7338 | |
2dbd5e30 KB |
7339 | /* Architectures which require breakpoint adjustment might not be able |
7340 | to place a breakpoint at the computed address. If so, the test | |
7341 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7342 | ecs->stop_func_start to an address at which a breakpoint may be | |
7343 | legitimately placed. | |
8fb3e588 | 7344 | |
2dbd5e30 KB |
7345 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7346 | made, GDB will enter an infinite loop when stepping through | |
7347 | optimized code consisting of VLIW instructions which contain | |
7348 | subinstructions corresponding to different source lines. On | |
7349 | FR-V, it's not permitted to place a breakpoint on any but the | |
7350 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7351 | set, GDB will adjust the breakpoint address to the beginning of | |
7352 | the VLIW instruction. Thus, we need to make the corresponding | |
7353 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7354 | |
568d6575 | 7355 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7356 | { |
7357 | ecs->stop_func_start | |
568d6575 | 7358 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7359 | ecs->stop_func_start); |
2dbd5e30 KB |
7360 | } |
7361 | ||
c2c6d25f JM |
7362 | if (ecs->stop_func_start == stop_pc) |
7363 | { | |
7364 | /* We are already there: stop now. */ | |
bdc36728 | 7365 | end_stepping_range (ecs); |
c2c6d25f JM |
7366 | return; |
7367 | } | |
7368 | else | |
7369 | { | |
7370 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 7371 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
7372 | sr_sal.pc = ecs->stop_func_start; |
7373 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7374 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7375 | |
c2c6d25f | 7376 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7377 | some machines the prologue is where the new fp value is |
7378 | established. */ | |
a6d9a66e | 7379 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7380 | |
7381 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7382 | ecs->event_thread->control.step_range_end |
7383 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7384 | } |
7385 | keep_going (ecs); | |
7386 | } | |
d4f3574e | 7387 | |
b2175913 MS |
7388 | /* Inferior has stepped backward into a subroutine call with source |
7389 | code that we should not step over. Do step to the beginning of the | |
7390 | last line of code in it. */ | |
7391 | ||
7392 | static void | |
568d6575 UW |
7393 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7394 | struct execution_control_state *ecs) | |
b2175913 | 7395 | { |
43f3e411 | 7396 | struct compunit_symtab *cust; |
167e4384 | 7397 | struct symtab_and_line stop_func_sal; |
b2175913 | 7398 | |
7e324e48 GB |
7399 | fill_in_stop_func (gdbarch, ecs); |
7400 | ||
43f3e411 DE |
7401 | cust = find_pc_compunit_symtab (stop_pc); |
7402 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 7403 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 MS |
7404 | ecs->stop_func_start); |
7405 | ||
7406 | stop_func_sal = find_pc_line (stop_pc, 0); | |
7407 | ||
7408 | /* OK, we're just going to keep stepping here. */ | |
7409 | if (stop_func_sal.pc == stop_pc) | |
7410 | { | |
7411 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7412 | end_stepping_range (ecs); |
b2175913 MS |
7413 | } |
7414 | else | |
7415 | { | |
7416 | /* Else just reset the step range and keep going. | |
7417 | No step-resume breakpoint, they don't work for | |
7418 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7419 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7420 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7421 | keep_going (ecs); |
7422 | } | |
7423 | return; | |
7424 | } | |
7425 | ||
d3169d93 | 7426 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7427 | This is used to both functions and to skip over code. */ |
7428 | ||
7429 | static void | |
2c03e5be PA |
7430 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7431 | struct symtab_and_line sr_sal, | |
7432 | struct frame_id sr_id, | |
7433 | enum bptype sr_type) | |
44cbf7b5 | 7434 | { |
611c83ae PA |
7435 | /* There should never be more than one step-resume or longjmp-resume |
7436 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7437 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7438 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7439 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
7440 | |
7441 | if (debug_infrun) | |
7442 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7443 | "infrun: inserting step-resume breakpoint at %s\n", |
7444 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7445 | |
8358c15c | 7446 | inferior_thread ()->control.step_resume_breakpoint |
2c03e5be PA |
7447 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type); |
7448 | } | |
7449 | ||
9da8c2a0 | 7450 | void |
2c03e5be PA |
7451 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7452 | struct symtab_and_line sr_sal, | |
7453 | struct frame_id sr_id) | |
7454 | { | |
7455 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7456 | sr_sal, sr_id, | |
7457 | bp_step_resume); | |
44cbf7b5 | 7458 | } |
7ce450bd | 7459 | |
2c03e5be PA |
7460 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7461 | This is used to skip a potential signal handler. | |
7ce450bd | 7462 | |
14e60db5 DJ |
7463 | This is called with the interrupted function's frame. The signal |
7464 | handler, when it returns, will resume the interrupted function at | |
7465 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7466 | |
7467 | static void | |
2c03e5be | 7468 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
7469 | { |
7470 | struct symtab_and_line sr_sal; | |
a6d9a66e | 7471 | struct gdbarch *gdbarch; |
d303a6c7 | 7472 | |
f4c1edd8 | 7473 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
7474 | init_sal (&sr_sal); /* initialize to zeros */ |
7475 | ||
a6d9a66e | 7476 | gdbarch = get_frame_arch (return_frame); |
568d6575 | 7477 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7478 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7479 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7480 | |
2c03e5be PA |
7481 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7482 | get_stack_frame_id (return_frame), | |
7483 | bp_hp_step_resume); | |
d303a6c7 AC |
7484 | } |
7485 | ||
2c03e5be PA |
7486 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7487 | is used to skip a function after stepping into it (for "next" or if | |
7488 | the called function has no debugging information). | |
14e60db5 DJ |
7489 | |
7490 | The current function has almost always been reached by single | |
7491 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7492 | current function, and the breakpoint will be set at the caller's | |
7493 | resume address. | |
7494 | ||
7495 | This is a separate function rather than reusing | |
2c03e5be | 7496 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7497 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7498 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7499 | |
7500 | static void | |
7501 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7502 | { | |
7503 | struct symtab_and_line sr_sal; | |
a6d9a66e | 7504 | struct gdbarch *gdbarch; |
14e60db5 DJ |
7505 | |
7506 | /* We shouldn't have gotten here if we don't know where the call site | |
7507 | is. */ | |
c7ce8faa | 7508 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 DJ |
7509 | |
7510 | init_sal (&sr_sal); /* initialize to zeros */ | |
7511 | ||
a6d9a66e | 7512 | gdbarch = frame_unwind_caller_arch (next_frame); |
c7ce8faa DJ |
7513 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7514 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7515 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7516 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7517 | |
a6d9a66e | 7518 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7519 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7520 | } |
7521 | ||
611c83ae PA |
7522 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7523 | new breakpoint at the target of a jmp_buf. The handling of | |
7524 | longjmp-resume uses the same mechanisms used for handling | |
7525 | "step-resume" breakpoints. */ | |
7526 | ||
7527 | static void | |
a6d9a66e | 7528 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7529 | { |
e81a37f7 TT |
7530 | /* There should never be more than one longjmp-resume breakpoint per |
7531 | thread, so we should never be setting a new | |
611c83ae | 7532 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7533 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
7534 | |
7535 | if (debug_infrun) | |
7536 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7537 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
7538 | paddress (gdbarch, pc)); | |
611c83ae | 7539 | |
e81a37f7 | 7540 | inferior_thread ()->control.exception_resume_breakpoint = |
a6d9a66e | 7541 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); |
611c83ae PA |
7542 | } |
7543 | ||
186c406b TT |
7544 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7545 | the exception. The block B is the block of the unwinder debug hook | |
7546 | function. FRAME is the frame corresponding to the call to this | |
7547 | function. SYM is the symbol of the function argument holding the | |
7548 | target PC of the exception. */ | |
7549 | ||
7550 | static void | |
7551 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7552 | const struct block *b, |
186c406b TT |
7553 | struct frame_info *frame, |
7554 | struct symbol *sym) | |
7555 | { | |
492d29ea | 7556 | TRY |
186c406b | 7557 | { |
63e43d3a | 7558 | struct block_symbol vsym; |
186c406b TT |
7559 | struct value *value; |
7560 | CORE_ADDR handler; | |
7561 | struct breakpoint *bp; | |
7562 | ||
63e43d3a PMR |
7563 | vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL); |
7564 | value = read_var_value (vsym.symbol, vsym.block, frame); | |
186c406b TT |
7565 | /* If the value was optimized out, revert to the old behavior. */ |
7566 | if (! value_optimized_out (value)) | |
7567 | { | |
7568 | handler = value_as_address (value); | |
7569 | ||
7570 | if (debug_infrun) | |
7571 | fprintf_unfiltered (gdb_stdlog, | |
7572 | "infrun: exception resume at %lx\n", | |
7573 | (unsigned long) handler); | |
7574 | ||
7575 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7576 | handler, bp_exception_resume); | |
c70a6932 JK |
7577 | |
7578 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7579 | frame = NULL; | |
7580 | ||
5d5658a1 | 7581 | bp->thread = tp->global_num; |
186c406b TT |
7582 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7583 | } | |
7584 | } | |
492d29ea PA |
7585 | CATCH (e, RETURN_MASK_ERROR) |
7586 | { | |
7587 | /* We want to ignore errors here. */ | |
7588 | } | |
7589 | END_CATCH | |
186c406b TT |
7590 | } |
7591 | ||
28106bc2 SDJ |
7592 | /* A helper for check_exception_resume that sets an |
7593 | exception-breakpoint based on a SystemTap probe. */ | |
7594 | ||
7595 | static void | |
7596 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7597 | const struct bound_probe *probe, |
28106bc2 SDJ |
7598 | struct frame_info *frame) |
7599 | { | |
7600 | struct value *arg_value; | |
7601 | CORE_ADDR handler; | |
7602 | struct breakpoint *bp; | |
7603 | ||
7604 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7605 | if (!arg_value) | |
7606 | return; | |
7607 | ||
7608 | handler = value_as_address (arg_value); | |
7609 | ||
7610 | if (debug_infrun) | |
7611 | fprintf_unfiltered (gdb_stdlog, | |
7612 | "infrun: exception resume at %s\n", | |
6bac7473 | 7613 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
7614 | handler)); |
7615 | ||
7616 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7617 | handler, bp_exception_resume); | |
5d5658a1 | 7618 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7619 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7620 | } | |
7621 | ||
186c406b TT |
7622 | /* This is called when an exception has been intercepted. Check to |
7623 | see whether the exception's destination is of interest, and if so, | |
7624 | set an exception resume breakpoint there. */ | |
7625 | ||
7626 | static void | |
7627 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7628 | struct frame_info *frame) |
186c406b | 7629 | { |
729662a5 | 7630 | struct bound_probe probe; |
28106bc2 SDJ |
7631 | struct symbol *func; |
7632 | ||
7633 | /* First see if this exception unwinding breakpoint was set via a | |
7634 | SystemTap probe point. If so, the probe has two arguments: the | |
7635 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7636 | set a breakpoint there. */ | |
6bac7473 | 7637 | probe = find_probe_by_pc (get_frame_pc (frame)); |
729662a5 | 7638 | if (probe.probe) |
28106bc2 | 7639 | { |
729662a5 | 7640 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7641 | return; |
7642 | } | |
7643 | ||
7644 | func = get_frame_function (frame); | |
7645 | if (!func) | |
7646 | return; | |
186c406b | 7647 | |
492d29ea | 7648 | TRY |
186c406b | 7649 | { |
3977b71f | 7650 | const struct block *b; |
8157b174 | 7651 | struct block_iterator iter; |
186c406b TT |
7652 | struct symbol *sym; |
7653 | int argno = 0; | |
7654 | ||
7655 | /* The exception breakpoint is a thread-specific breakpoint on | |
7656 | the unwinder's debug hook, declared as: | |
7657 | ||
7658 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7659 | ||
7660 | The CFA argument indicates the frame to which control is | |
7661 | about to be transferred. HANDLER is the destination PC. | |
7662 | ||
7663 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7664 | This is not extremely efficient but it avoids issues in gdb | |
7665 | with computing the DWARF CFA, and it also works even in weird | |
7666 | cases such as throwing an exception from inside a signal | |
7667 | handler. */ | |
7668 | ||
7669 | b = SYMBOL_BLOCK_VALUE (func); | |
7670 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7671 | { | |
7672 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7673 | continue; | |
7674 | ||
7675 | if (argno == 0) | |
7676 | ++argno; | |
7677 | else | |
7678 | { | |
7679 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7680 | b, frame, sym); | |
7681 | break; | |
7682 | } | |
7683 | } | |
7684 | } | |
492d29ea PA |
7685 | CATCH (e, RETURN_MASK_ERROR) |
7686 | { | |
7687 | } | |
7688 | END_CATCH | |
186c406b TT |
7689 | } |
7690 | ||
104c1213 | 7691 | static void |
22bcd14b | 7692 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7693 | { |
527159b7 | 7694 | if (debug_infrun) |
22bcd14b | 7695 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 7696 | |
cd0fc7c3 SS |
7697 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7698 | ecs->wait_some_more = 0; | |
fbea99ea PA |
7699 | |
7700 | /* If all-stop, but the target is always in non-stop mode, stop all | |
7701 | threads now that we're presenting the stop to the user. */ | |
7702 | if (!non_stop && target_is_non_stop_p ()) | |
7703 | stop_all_threads (); | |
cd0fc7c3 SS |
7704 | } |
7705 | ||
4d9d9d04 PA |
7706 | /* Like keep_going, but passes the signal to the inferior, even if the |
7707 | signal is set to nopass. */ | |
d4f3574e SS |
7708 | |
7709 | static void | |
4d9d9d04 | 7710 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7711 | { |
c4dbc9af PA |
7712 | /* Make sure normal_stop is called if we get a QUIT handled before |
7713 | reaching resume. */ | |
7714 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
7715 | ||
4d9d9d04 | 7716 | gdb_assert (ptid_equal (ecs->event_thread->ptid, inferior_ptid)); |
372316f1 | 7717 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7718 | |
d4f3574e | 7719 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
7720 | ecs->event_thread->prev_pc |
7721 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 7722 | |
4d9d9d04 | 7723 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7724 | { |
4d9d9d04 PA |
7725 | struct thread_info *tp = ecs->event_thread; |
7726 | ||
7727 | if (debug_infrun) | |
7728 | fprintf_unfiltered (gdb_stdlog, | |
7729 | "infrun: %s has trap_expected set, " | |
7730 | "resuming to collect trap\n", | |
7731 | target_pid_to_str (tp->ptid)); | |
7732 | ||
a9ba6bae PA |
7733 | /* We haven't yet gotten our trap, and either: intercepted a |
7734 | non-signal event (e.g., a fork); or took a signal which we | |
7735 | are supposed to pass through to the inferior. Simply | |
7736 | continue. */ | |
c4dbc9af | 7737 | discard_cleanups (old_cleanups); |
64ce06e4 | 7738 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7739 | } |
372316f1 PA |
7740 | else if (step_over_info_valid_p ()) |
7741 | { | |
7742 | /* Another thread is stepping over a breakpoint in-line. If | |
7743 | this thread needs a step-over too, queue the request. In | |
7744 | either case, this resume must be deferred for later. */ | |
7745 | struct thread_info *tp = ecs->event_thread; | |
7746 | ||
7747 | if (ecs->hit_singlestep_breakpoint | |
7748 | || thread_still_needs_step_over (tp)) | |
7749 | { | |
7750 | if (debug_infrun) | |
7751 | fprintf_unfiltered (gdb_stdlog, | |
7752 | "infrun: step-over already in progress: " | |
7753 | "step-over for %s deferred\n", | |
7754 | target_pid_to_str (tp->ptid)); | |
7755 | thread_step_over_chain_enqueue (tp); | |
7756 | } | |
7757 | else | |
7758 | { | |
7759 | if (debug_infrun) | |
7760 | fprintf_unfiltered (gdb_stdlog, | |
7761 | "infrun: step-over in progress: " | |
7762 | "resume of %s deferred\n", | |
7763 | target_pid_to_str (tp->ptid)); | |
7764 | } | |
7765 | ||
7766 | discard_cleanups (old_cleanups); | |
7767 | } | |
d4f3574e SS |
7768 | else |
7769 | { | |
31e77af2 | 7770 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7771 | int remove_bp; |
7772 | int remove_wps; | |
8d297bbf | 7773 | step_over_what step_what; |
31e77af2 | 7774 | |
d4f3574e | 7775 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7776 | anyway (if we got a signal, the user asked it be passed to |
7777 | the child) | |
7778 | -- or -- | |
7779 | We got our expected trap, but decided we should resume from | |
7780 | it. | |
d4f3574e | 7781 | |
a9ba6bae | 7782 | We're going to run this baby now! |
d4f3574e | 7783 | |
c36b740a VP |
7784 | Note that insert_breakpoints won't try to re-insert |
7785 | already inserted breakpoints. Therefore, we don't | |
7786 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7787 | |
31e77af2 PA |
7788 | /* If we need to step over a breakpoint, and we're not using |
7789 | displaced stepping to do so, insert all breakpoints | |
7790 | (watchpoints, etc.) but the one we're stepping over, step one | |
7791 | instruction, and then re-insert the breakpoint when that step | |
7792 | is finished. */ | |
963f9c80 | 7793 | |
6c4cfb24 PA |
7794 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7795 | ||
963f9c80 | 7796 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7797 | || (step_what & STEP_OVER_BREAKPOINT)); |
7798 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7799 | |
cb71640d PA |
7800 | /* We can't use displaced stepping if we need to step past a |
7801 | watchpoint. The instruction copied to the scratch pad would | |
7802 | still trigger the watchpoint. */ | |
7803 | if (remove_bp | |
3fc8eb30 | 7804 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7805 | { |
31e77af2 | 7806 | set_step_over_info (get_regcache_aspace (regcache), |
21edc42f YQ |
7807 | regcache_read_pc (regcache), remove_wps, |
7808 | ecs->event_thread->global_num); | |
45e8c884 | 7809 | } |
963f9c80 | 7810 | else if (remove_wps) |
21edc42f | 7811 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
7812 | |
7813 | /* If we now need to do an in-line step-over, we need to stop | |
7814 | all other threads. Note this must be done before | |
7815 | insert_breakpoints below, because that removes the breakpoint | |
7816 | we're about to step over, otherwise other threads could miss | |
7817 | it. */ | |
fbea99ea | 7818 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7819 | stop_all_threads (); |
abbb1732 | 7820 | |
31e77af2 | 7821 | /* Stop stepping if inserting breakpoints fails. */ |
492d29ea | 7822 | TRY |
31e77af2 PA |
7823 | { |
7824 | insert_breakpoints (); | |
7825 | } | |
492d29ea | 7826 | CATCH (e, RETURN_MASK_ERROR) |
31e77af2 PA |
7827 | { |
7828 | exception_print (gdb_stderr, e); | |
22bcd14b | 7829 | stop_waiting (ecs); |
de1fe8c8 | 7830 | discard_cleanups (old_cleanups); |
31e77af2 | 7831 | return; |
d4f3574e | 7832 | } |
492d29ea | 7833 | END_CATCH |
d4f3574e | 7834 | |
963f9c80 | 7835 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7836 | |
c4dbc9af | 7837 | discard_cleanups (old_cleanups); |
64ce06e4 | 7838 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7839 | } |
7840 | ||
488f131b | 7841 | prepare_to_wait (ecs); |
d4f3574e SS |
7842 | } |
7843 | ||
4d9d9d04 PA |
7844 | /* Called when we should continue running the inferior, because the |
7845 | current event doesn't cause a user visible stop. This does the | |
7846 | resuming part; waiting for the next event is done elsewhere. */ | |
7847 | ||
7848 | static void | |
7849 | keep_going (struct execution_control_state *ecs) | |
7850 | { | |
7851 | if (ecs->event_thread->control.trap_expected | |
7852 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7853 | ecs->event_thread->control.trap_expected = 0; | |
7854 | ||
7855 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7856 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7857 | keep_going_pass_signal (ecs); | |
7858 | } | |
7859 | ||
104c1213 JM |
7860 | /* This function normally comes after a resume, before |
7861 | handle_inferior_event exits. It takes care of any last bits of | |
7862 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7863 | |
104c1213 JM |
7864 | static void |
7865 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7866 | { |
527159b7 | 7867 | if (debug_infrun) |
8a9de0e4 | 7868 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 7869 | |
104c1213 | 7870 | ecs->wait_some_more = 1; |
0b333c5e PA |
7871 | |
7872 | if (!target_is_async_p ()) | |
7873 | mark_infrun_async_event_handler (); | |
c906108c | 7874 | } |
11cf8741 | 7875 | |
fd664c91 | 7876 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7877 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7878 | |
7879 | static void | |
bdc36728 | 7880 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7881 | { |
bdc36728 | 7882 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7883 | stop_waiting (ecs); |
fd664c91 PA |
7884 | } |
7885 | ||
33d62d64 JK |
7886 | /* Several print_*_reason functions to print why the inferior has stopped. |
7887 | We always print something when the inferior exits, or receives a signal. | |
7888 | The rest of the cases are dealt with later on in normal_stop and | |
7889 | print_it_typical. Ideally there should be a call to one of these | |
7890 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7891 | stop_waiting is called. |
33d62d64 | 7892 | |
fd664c91 PA |
7893 | Note that we don't call these directly, instead we delegate that to |
7894 | the interpreters, through observers. Interpreters then call these | |
7895 | with whatever uiout is right. */ | |
33d62d64 | 7896 | |
fd664c91 PA |
7897 | void |
7898 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7899 | { |
fd664c91 | 7900 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7901 | |
112e8700 | 7902 | if (uiout->is_mi_like_p ()) |
fd664c91 | 7903 | { |
112e8700 | 7904 | uiout->field_string ("reason", |
fd664c91 PA |
7905 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
7906 | } | |
7907 | } | |
33d62d64 | 7908 | |
fd664c91 PA |
7909 | void |
7910 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7911 | { |
33d62d64 | 7912 | annotate_signalled (); |
112e8700 SM |
7913 | if (uiout->is_mi_like_p ()) |
7914 | uiout->field_string | |
7915 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7916 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 7917 | annotate_signal_name (); |
112e8700 | 7918 | uiout->field_string ("signal-name", |
2ea28649 | 7919 | gdb_signal_to_name (siggnal)); |
33d62d64 | 7920 | annotate_signal_name_end (); |
112e8700 | 7921 | uiout->text (", "); |
33d62d64 | 7922 | annotate_signal_string (); |
112e8700 | 7923 | uiout->field_string ("signal-meaning", |
2ea28649 | 7924 | gdb_signal_to_string (siggnal)); |
33d62d64 | 7925 | annotate_signal_string_end (); |
112e8700 SM |
7926 | uiout->text (".\n"); |
7927 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
7928 | } |
7929 | ||
fd664c91 PA |
7930 | void |
7931 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7932 | { |
fda326dd TT |
7933 | struct inferior *inf = current_inferior (); |
7934 | const char *pidstr = target_pid_to_str (pid_to_ptid (inf->pid)); | |
7935 | ||
33d62d64 JK |
7936 | annotate_exited (exitstatus); |
7937 | if (exitstatus) | |
7938 | { | |
112e8700 SM |
7939 | if (uiout->is_mi_like_p ()) |
7940 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
7941 | uiout->text ("[Inferior "); | |
7942 | uiout->text (plongest (inf->num)); | |
7943 | uiout->text (" ("); | |
7944 | uiout->text (pidstr); | |
7945 | uiout->text (") exited with code "); | |
7946 | uiout->field_fmt ("exit-code", "0%o", (unsigned int) exitstatus); | |
7947 | uiout->text ("]\n"); | |
33d62d64 JK |
7948 | } |
7949 | else | |
11cf8741 | 7950 | { |
112e8700 SM |
7951 | if (uiout->is_mi_like_p ()) |
7952 | uiout->field_string | |
7953 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
7954 | uiout->text ("[Inferior "); | |
7955 | uiout->text (plongest (inf->num)); | |
7956 | uiout->text (" ("); | |
7957 | uiout->text (pidstr); | |
7958 | uiout->text (") exited normally]\n"); | |
33d62d64 | 7959 | } |
33d62d64 JK |
7960 | } |
7961 | ||
012b3a21 WT |
7962 | /* Some targets/architectures can do extra processing/display of |
7963 | segmentation faults. E.g., Intel MPX boundary faults. | |
7964 | Call the architecture dependent function to handle the fault. */ | |
7965 | ||
7966 | static void | |
7967 | handle_segmentation_fault (struct ui_out *uiout) | |
7968 | { | |
7969 | struct regcache *regcache = get_current_regcache (); | |
7970 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7971 | ||
7972 | if (gdbarch_handle_segmentation_fault_p (gdbarch)) | |
7973 | gdbarch_handle_segmentation_fault (gdbarch, uiout); | |
7974 | } | |
7975 | ||
fd664c91 PA |
7976 | void |
7977 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 7978 | { |
f303dbd6 PA |
7979 | struct thread_info *thr = inferior_thread (); |
7980 | ||
33d62d64 JK |
7981 | annotate_signal (); |
7982 | ||
112e8700 | 7983 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
7984 | ; |
7985 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 7986 | { |
f303dbd6 | 7987 | const char *name; |
33d62d64 | 7988 | |
112e8700 SM |
7989 | uiout->text ("\nThread "); |
7990 | uiout->field_fmt ("thread-id", "%s", print_thread_id (thr)); | |
f303dbd6 PA |
7991 | |
7992 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
7993 | if (name != NULL) | |
7994 | { | |
112e8700 SM |
7995 | uiout->text (" \""); |
7996 | uiout->field_fmt ("name", "%s", name); | |
7997 | uiout->text ("\""); | |
f303dbd6 | 7998 | } |
33d62d64 | 7999 | } |
f303dbd6 | 8000 | else |
112e8700 | 8001 | uiout->text ("\nProgram"); |
f303dbd6 | 8002 | |
112e8700 SM |
8003 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8004 | uiout->text (" stopped"); | |
33d62d64 JK |
8005 | else |
8006 | { | |
112e8700 | 8007 | uiout->text (" received signal "); |
8b93c638 | 8008 | annotate_signal_name (); |
112e8700 SM |
8009 | if (uiout->is_mi_like_p ()) |
8010 | uiout->field_string | |
8011 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8012 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8013 | annotate_signal_name_end (); |
112e8700 | 8014 | uiout->text (", "); |
8b93c638 | 8015 | annotate_signal_string (); |
112e8700 | 8016 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 WT |
8017 | |
8018 | if (siggnal == GDB_SIGNAL_SEGV) | |
8019 | handle_segmentation_fault (uiout); | |
8020 | ||
8b93c638 | 8021 | annotate_signal_string_end (); |
33d62d64 | 8022 | } |
112e8700 | 8023 | uiout->text (".\n"); |
33d62d64 | 8024 | } |
252fbfc8 | 8025 | |
fd664c91 PA |
8026 | void |
8027 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8028 | { |
112e8700 | 8029 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8030 | } |
43ff13b4 | 8031 | |
0c7e1a46 PA |
8032 | /* Print current location without a level number, if we have changed |
8033 | functions or hit a breakpoint. Print source line if we have one. | |
8034 | bpstat_print contains the logic deciding in detail what to print, | |
8035 | based on the event(s) that just occurred. */ | |
8036 | ||
243a9253 PA |
8037 | static void |
8038 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8039 | { |
8040 | int bpstat_ret; | |
f486487f | 8041 | enum print_what source_flag; |
0c7e1a46 PA |
8042 | int do_frame_printing = 1; |
8043 | struct thread_info *tp = inferior_thread (); | |
8044 | ||
8045 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8046 | switch (bpstat_ret) | |
8047 | { | |
8048 | case PRINT_UNKNOWN: | |
8049 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8050 | should) carry around the function and does (or should) use | |
8051 | that when doing a frame comparison. */ | |
8052 | if (tp->control.stop_step | |
8053 | && frame_id_eq (tp->control.step_frame_id, | |
8054 | get_frame_id (get_current_frame ())) | |
885eeb5b | 8055 | && tp->control.step_start_function == find_pc_function (stop_pc)) |
0c7e1a46 PA |
8056 | { |
8057 | /* Finished step, just print source line. */ | |
8058 | source_flag = SRC_LINE; | |
8059 | } | |
8060 | else | |
8061 | { | |
8062 | /* Print location and source line. */ | |
8063 | source_flag = SRC_AND_LOC; | |
8064 | } | |
8065 | break; | |
8066 | case PRINT_SRC_AND_LOC: | |
8067 | /* Print location and source line. */ | |
8068 | source_flag = SRC_AND_LOC; | |
8069 | break; | |
8070 | case PRINT_SRC_ONLY: | |
8071 | source_flag = SRC_LINE; | |
8072 | break; | |
8073 | case PRINT_NOTHING: | |
8074 | /* Something bogus. */ | |
8075 | source_flag = SRC_LINE; | |
8076 | do_frame_printing = 0; | |
8077 | break; | |
8078 | default: | |
8079 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8080 | } | |
8081 | ||
8082 | /* The behavior of this routine with respect to the source | |
8083 | flag is: | |
8084 | SRC_LINE: Print only source line | |
8085 | LOCATION: Print only location | |
8086 | SRC_AND_LOC: Print location and source line. */ | |
8087 | if (do_frame_printing) | |
8088 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8089 | } |
8090 | ||
243a9253 PA |
8091 | /* See infrun.h. */ |
8092 | ||
8093 | void | |
8094 | print_stop_event (struct ui_out *uiout) | |
8095 | { | |
243a9253 PA |
8096 | struct target_waitstatus last; |
8097 | ptid_t last_ptid; | |
8098 | struct thread_info *tp; | |
8099 | ||
8100 | get_last_target_status (&last_ptid, &last); | |
8101 | ||
67ad9399 TT |
8102 | { |
8103 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8104 | |
67ad9399 | 8105 | print_stop_location (&last); |
243a9253 | 8106 | |
67ad9399 TT |
8107 | /* Display the auto-display expressions. */ |
8108 | do_displays (); | |
8109 | } | |
243a9253 PA |
8110 | |
8111 | tp = inferior_thread (); | |
8112 | if (tp->thread_fsm != NULL | |
8113 | && thread_fsm_finished_p (tp->thread_fsm)) | |
8114 | { | |
8115 | struct return_value_info *rv; | |
8116 | ||
8117 | rv = thread_fsm_return_value (tp->thread_fsm); | |
8118 | if (rv != NULL) | |
8119 | print_return_value (uiout, rv); | |
8120 | } | |
0c7e1a46 PA |
8121 | } |
8122 | ||
388a7084 PA |
8123 | /* See infrun.h. */ |
8124 | ||
8125 | void | |
8126 | maybe_remove_breakpoints (void) | |
8127 | { | |
8128 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
8129 | { | |
8130 | if (remove_breakpoints ()) | |
8131 | { | |
8132 | target_terminal_ours_for_output (); | |
8133 | printf_filtered (_("Cannot remove breakpoints because " | |
8134 | "program is no longer writable.\nFurther " | |
8135 | "execution is probably impossible.\n")); | |
8136 | } | |
8137 | } | |
8138 | } | |
8139 | ||
4c2f2a79 PA |
8140 | /* The execution context that just caused a normal stop. */ |
8141 | ||
8142 | struct stop_context | |
8143 | { | |
8144 | /* The stop ID. */ | |
8145 | ULONGEST stop_id; | |
c906108c | 8146 | |
4c2f2a79 | 8147 | /* The event PTID. */ |
c906108c | 8148 | |
4c2f2a79 PA |
8149 | ptid_t ptid; |
8150 | ||
8151 | /* If stopp for a thread event, this is the thread that caused the | |
8152 | stop. */ | |
8153 | struct thread_info *thread; | |
8154 | ||
8155 | /* The inferior that caused the stop. */ | |
8156 | int inf_num; | |
8157 | }; | |
8158 | ||
8159 | /* Returns a new stop context. If stopped for a thread event, this | |
8160 | takes a strong reference to the thread. */ | |
8161 | ||
8162 | static struct stop_context * | |
8163 | save_stop_context (void) | |
8164 | { | |
224c3ddb | 8165 | struct stop_context *sc = XNEW (struct stop_context); |
4c2f2a79 PA |
8166 | |
8167 | sc->stop_id = get_stop_id (); | |
8168 | sc->ptid = inferior_ptid; | |
8169 | sc->inf_num = current_inferior ()->num; | |
8170 | ||
8171 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
8172 | { | |
8173 | /* Take a strong reference so that the thread can't be deleted | |
8174 | yet. */ | |
8175 | sc->thread = inferior_thread (); | |
803bdfe4 | 8176 | sc->thread->incref (); |
4c2f2a79 PA |
8177 | } |
8178 | else | |
8179 | sc->thread = NULL; | |
8180 | ||
8181 | return sc; | |
8182 | } | |
8183 | ||
8184 | /* Release a stop context previously created with save_stop_context. | |
8185 | Releases the strong reference to the thread as well. */ | |
8186 | ||
8187 | static void | |
8188 | release_stop_context_cleanup (void *arg) | |
8189 | { | |
9a3c8263 | 8190 | struct stop_context *sc = (struct stop_context *) arg; |
4c2f2a79 PA |
8191 | |
8192 | if (sc->thread != NULL) | |
803bdfe4 | 8193 | sc->thread->decref (); |
4c2f2a79 PA |
8194 | xfree (sc); |
8195 | } | |
8196 | ||
8197 | /* Return true if the current context no longer matches the saved stop | |
8198 | context. */ | |
8199 | ||
8200 | static int | |
8201 | stop_context_changed (struct stop_context *prev) | |
8202 | { | |
8203 | if (!ptid_equal (prev->ptid, inferior_ptid)) | |
8204 | return 1; | |
8205 | if (prev->inf_num != current_inferior ()->num) | |
8206 | return 1; | |
8207 | if (prev->thread != NULL && prev->thread->state != THREAD_STOPPED) | |
8208 | return 1; | |
8209 | if (get_stop_id () != prev->stop_id) | |
8210 | return 1; | |
8211 | return 0; | |
8212 | } | |
8213 | ||
8214 | /* See infrun.h. */ | |
8215 | ||
8216 | int | |
96baa820 | 8217 | normal_stop (void) |
c906108c | 8218 | { |
73b65bb0 DJ |
8219 | struct target_waitstatus last; |
8220 | ptid_t last_ptid; | |
29f49a6a | 8221 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
e1316e60 | 8222 | ptid_t pid_ptid; |
73b65bb0 DJ |
8223 | |
8224 | get_last_target_status (&last_ptid, &last); | |
8225 | ||
4c2f2a79 PA |
8226 | new_stop_id (); |
8227 | ||
29f49a6a PA |
8228 | /* If an exception is thrown from this point on, make sure to |
8229 | propagate GDB's knowledge of the executing state to the | |
8230 | frontend/user running state. A QUIT is an easy exception to see | |
8231 | here, so do this before any filtered output. */ | |
c35b1492 PA |
8232 | if (!non_stop) |
8233 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
e1316e60 PA |
8234 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8235 | || last.kind == TARGET_WAITKIND_EXITED) | |
8236 | { | |
8237 | /* On some targets, we may still have live threads in the | |
8238 | inferior when we get a process exit event. E.g., for | |
8239 | "checkpoint", when the current checkpoint/fork exits, | |
8240 | linux-fork.c automatically switches to another fork from | |
8241 | within target_mourn_inferior. */ | |
8242 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
8243 | { | |
8244 | pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
8245 | make_cleanup (finish_thread_state_cleanup, &pid_ptid); | |
8246 | } | |
8247 | } | |
8248 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c35b1492 | 8249 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); |
29f49a6a | 8250 | |
b57bacec PA |
8251 | /* As we're presenting a stop, and potentially removing breakpoints, |
8252 | update the thread list so we can tell whether there are threads | |
8253 | running on the target. With target remote, for example, we can | |
8254 | only learn about new threads when we explicitly update the thread | |
8255 | list. Do this before notifying the interpreters about signal | |
8256 | stops, end of stepping ranges, etc., so that the "new thread" | |
8257 | output is emitted before e.g., "Program received signal FOO", | |
8258 | instead of after. */ | |
8259 | update_thread_list (); | |
8260 | ||
8261 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
8262 | observer_notify_signal_received (inferior_thread ()->suspend.stop_signal); | |
8263 | ||
c906108c SS |
8264 | /* As with the notification of thread events, we want to delay |
8265 | notifying the user that we've switched thread context until | |
8266 | the inferior actually stops. | |
8267 | ||
73b65bb0 DJ |
8268 | There's no point in saying anything if the inferior has exited. |
8269 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8270 | "received a signal". |
8271 | ||
8272 | Also skip saying anything in non-stop mode. In that mode, as we | |
8273 | don't want GDB to switch threads behind the user's back, to avoid | |
8274 | races where the user is typing a command to apply to thread x, | |
8275 | but GDB switches to thread y before the user finishes entering | |
8276 | the command, fetch_inferior_event installs a cleanup to restore | |
8277 | the current thread back to the thread the user had selected right | |
8278 | after this event is handled, so we're not really switching, only | |
8279 | informing of a stop. */ | |
4f8d22e3 PA |
8280 | if (!non_stop |
8281 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
8282 | && target_has_execution |
8283 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8284 | && last.kind != TARGET_WAITKIND_EXITED |
8285 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8286 | { |
0e454242 | 8287 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8288 | { |
8289 | target_terminal_ours_for_output (); | |
8290 | printf_filtered (_("[Switching to %s]\n"), | |
8291 | target_pid_to_str (inferior_ptid)); | |
8292 | annotate_thread_changed (); | |
8293 | } | |
39f77062 | 8294 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8295 | } |
c906108c | 8296 | |
0e5bf2a8 PA |
8297 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8298 | { | |
0e454242 | 8299 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8300 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8301 | { | |
8302 | target_terminal_ours_for_output (); | |
8303 | printf_filtered (_("No unwaited-for children left.\n")); | |
8304 | } | |
0e5bf2a8 PA |
8305 | } |
8306 | ||
b57bacec | 8307 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8308 | maybe_remove_breakpoints (); |
c906108c | 8309 | |
c906108c SS |
8310 | /* If an auto-display called a function and that got a signal, |
8311 | delete that auto-display to avoid an infinite recursion. */ | |
8312 | ||
8313 | if (stopped_by_random_signal) | |
8314 | disable_current_display (); | |
8315 | ||
0e454242 | 8316 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8317 | { |
8318 | async_enable_stdin (); | |
8319 | } | |
c906108c | 8320 | |
388a7084 PA |
8321 | /* Let the user/frontend see the threads as stopped. */ |
8322 | do_cleanups (old_chain); | |
8323 | ||
8324 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8325 | and current location is based on that. Handle the case where the | |
8326 | dummy call is returning after being stopped. E.g. the dummy call | |
8327 | previously hit a breakpoint. (If the dummy call returns | |
8328 | normally, we won't reach here.) Do this before the stop hook is | |
8329 | run, so that it doesn't get to see the temporary dummy frame, | |
8330 | which is not where we'll present the stop. */ | |
8331 | if (has_stack_frames ()) | |
8332 | { | |
8333 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8334 | { | |
8335 | /* Pop the empty frame that contains the stack dummy. This | |
8336 | also restores inferior state prior to the call (struct | |
8337 | infcall_suspend_state). */ | |
8338 | struct frame_info *frame = get_current_frame (); | |
8339 | ||
8340 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8341 | frame_pop (frame); | |
8342 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8343 | does which means there's now no selected frame. */ | |
8344 | } | |
8345 | ||
8346 | select_frame (get_current_frame ()); | |
8347 | ||
8348 | /* Set the current source location. */ | |
8349 | set_current_sal_from_frame (get_current_frame ()); | |
8350 | } | |
dd7e2d2b PA |
8351 | |
8352 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8353 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8354 | if (stop_command != NULL) |
8355 | { | |
8356 | struct stop_context *saved_context = save_stop_context (); | |
8357 | struct cleanup *old_chain | |
8358 | = make_cleanup (release_stop_context_cleanup, saved_context); | |
8359 | ||
8360 | catch_errors (hook_stop_stub, stop_command, | |
8361 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
8362 | ||
8363 | /* If the stop hook resumes the target, then there's no point in | |
8364 | trying to notify about the previous stop; its context is | |
8365 | gone. Likewise if the command switches thread or inferior -- | |
8366 | the observers would print a stop for the wrong | |
8367 | thread/inferior. */ | |
8368 | if (stop_context_changed (saved_context)) | |
8369 | { | |
8370 | do_cleanups (old_chain); | |
8371 | return 1; | |
8372 | } | |
8373 | do_cleanups (old_chain); | |
8374 | } | |
dd7e2d2b | 8375 | |
388a7084 PA |
8376 | /* Notify observers about the stop. This is where the interpreters |
8377 | print the stop event. */ | |
8378 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
8379 | observer_notify_normal_stop (inferior_thread ()->control.stop_bpstat, | |
8380 | stop_print_frame); | |
8381 | else | |
8382 | observer_notify_normal_stop (NULL, stop_print_frame); | |
347bddb7 | 8383 | |
243a9253 PA |
8384 | annotate_stopped (); |
8385 | ||
48844aa6 PA |
8386 | if (target_has_execution) |
8387 | { | |
8388 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
8389 | && last.kind != TARGET_WAITKIND_EXITED) | |
8390 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
8391 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8392 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8393 | } |
6c95b8df PA |
8394 | |
8395 | /* Try to get rid of automatically added inferiors that are no | |
8396 | longer needed. Keeping those around slows down things linearly. | |
8397 | Note that this never removes the current inferior. */ | |
8398 | prune_inferiors (); | |
4c2f2a79 PA |
8399 | |
8400 | return 0; | |
c906108c SS |
8401 | } |
8402 | ||
8403 | static int | |
96baa820 | 8404 | hook_stop_stub (void *cmd) |
c906108c | 8405 | { |
5913bcb0 | 8406 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
8407 | return (0); |
8408 | } | |
8409 | \f | |
c5aa993b | 8410 | int |
96baa820 | 8411 | signal_stop_state (int signo) |
c906108c | 8412 | { |
d6b48e9c | 8413 | return signal_stop[signo]; |
c906108c SS |
8414 | } |
8415 | ||
c5aa993b | 8416 | int |
96baa820 | 8417 | signal_print_state (int signo) |
c906108c SS |
8418 | { |
8419 | return signal_print[signo]; | |
8420 | } | |
8421 | ||
c5aa993b | 8422 | int |
96baa820 | 8423 | signal_pass_state (int signo) |
c906108c SS |
8424 | { |
8425 | return signal_program[signo]; | |
8426 | } | |
8427 | ||
2455069d UW |
8428 | static void |
8429 | signal_cache_update (int signo) | |
8430 | { | |
8431 | if (signo == -1) | |
8432 | { | |
a493e3e2 | 8433 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8434 | signal_cache_update (signo); |
8435 | ||
8436 | return; | |
8437 | } | |
8438 | ||
8439 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8440 | && signal_print[signo] == 0 | |
ab04a2af TT |
8441 | && signal_program[signo] == 1 |
8442 | && signal_catch[signo] == 0); | |
2455069d UW |
8443 | } |
8444 | ||
488f131b | 8445 | int |
7bda5e4a | 8446 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8447 | { |
8448 | int ret = signal_stop[signo]; | |
abbb1732 | 8449 | |
d4f3574e | 8450 | signal_stop[signo] = state; |
2455069d | 8451 | signal_cache_update (signo); |
d4f3574e SS |
8452 | return ret; |
8453 | } | |
8454 | ||
488f131b | 8455 | int |
7bda5e4a | 8456 | signal_print_update (int signo, int state) |
d4f3574e SS |
8457 | { |
8458 | int ret = signal_print[signo]; | |
abbb1732 | 8459 | |
d4f3574e | 8460 | signal_print[signo] = state; |
2455069d | 8461 | signal_cache_update (signo); |
d4f3574e SS |
8462 | return ret; |
8463 | } | |
8464 | ||
488f131b | 8465 | int |
7bda5e4a | 8466 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8467 | { |
8468 | int ret = signal_program[signo]; | |
abbb1732 | 8469 | |
d4f3574e | 8470 | signal_program[signo] = state; |
2455069d | 8471 | signal_cache_update (signo); |
d4f3574e SS |
8472 | return ret; |
8473 | } | |
8474 | ||
ab04a2af TT |
8475 | /* Update the global 'signal_catch' from INFO and notify the |
8476 | target. */ | |
8477 | ||
8478 | void | |
8479 | signal_catch_update (const unsigned int *info) | |
8480 | { | |
8481 | int i; | |
8482 | ||
8483 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8484 | signal_catch[i] = info[i] > 0; | |
8485 | signal_cache_update (-1); | |
8486 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
8487 | } | |
8488 | ||
c906108c | 8489 | static void |
96baa820 | 8490 | sig_print_header (void) |
c906108c | 8491 | { |
3e43a32a MS |
8492 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8493 | "to program\tDescription\n")); | |
c906108c SS |
8494 | } |
8495 | ||
8496 | static void | |
2ea28649 | 8497 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8498 | { |
2ea28649 | 8499 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8500 | int name_padding = 13 - strlen (name); |
96baa820 | 8501 | |
c906108c SS |
8502 | if (name_padding <= 0) |
8503 | name_padding = 0; | |
8504 | ||
8505 | printf_filtered ("%s", name); | |
488f131b | 8506 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8507 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8508 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8509 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8510 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8511 | } |
8512 | ||
8513 | /* Specify how various signals in the inferior should be handled. */ | |
8514 | ||
8515 | static void | |
96baa820 | 8516 | handle_command (char *args, int from_tty) |
c906108c SS |
8517 | { |
8518 | char **argv; | |
8519 | int digits, wordlen; | |
8520 | int sigfirst, signum, siglast; | |
2ea28649 | 8521 | enum gdb_signal oursig; |
c906108c SS |
8522 | int allsigs; |
8523 | int nsigs; | |
8524 | unsigned char *sigs; | |
8525 | struct cleanup *old_chain; | |
8526 | ||
8527 | if (args == NULL) | |
8528 | { | |
e2e0b3e5 | 8529 | error_no_arg (_("signal to handle")); |
c906108c SS |
8530 | } |
8531 | ||
1777feb0 | 8532 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8533 | |
a493e3e2 | 8534 | nsigs = (int) GDB_SIGNAL_LAST; |
c906108c SS |
8535 | sigs = (unsigned char *) alloca (nsigs); |
8536 | memset (sigs, 0, nsigs); | |
8537 | ||
1777feb0 | 8538 | /* Break the command line up into args. */ |
c906108c | 8539 | |
d1a41061 | 8540 | argv = gdb_buildargv (args); |
7a292a7a | 8541 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
8542 | |
8543 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8544 | actions. Signal numbers and signal names may be interspersed with | |
8545 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8546 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c SS |
8547 | |
8548 | while (*argv != NULL) | |
8549 | { | |
8550 | wordlen = strlen (*argv); | |
8551 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
8552 | {; | |
8553 | } | |
8554 | allsigs = 0; | |
8555 | sigfirst = siglast = -1; | |
8556 | ||
8557 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
8558 | { | |
8559 | /* Apply action to all signals except those used by the | |
1777feb0 | 8560 | debugger. Silently skip those. */ |
c906108c SS |
8561 | allsigs = 1; |
8562 | sigfirst = 0; | |
8563 | siglast = nsigs - 1; | |
8564 | } | |
8565 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
8566 | { | |
8567 | SET_SIGS (nsigs, sigs, signal_stop); | |
8568 | SET_SIGS (nsigs, sigs, signal_print); | |
8569 | } | |
8570 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
8571 | { | |
8572 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8573 | } | |
8574 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
8575 | { | |
8576 | SET_SIGS (nsigs, sigs, signal_print); | |
8577 | } | |
8578 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
8579 | { | |
8580 | SET_SIGS (nsigs, sigs, signal_program); | |
8581 | } | |
8582 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
8583 | { | |
8584 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8585 | } | |
8586 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
8587 | { | |
8588 | SET_SIGS (nsigs, sigs, signal_program); | |
8589 | } | |
8590 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
8591 | { | |
8592 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8593 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8594 | } | |
8595 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
8596 | { | |
8597 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8598 | } | |
8599 | else if (digits > 0) | |
8600 | { | |
8601 | /* It is numeric. The numeric signal refers to our own | |
8602 | internal signal numbering from target.h, not to host/target | |
8603 | signal number. This is a feature; users really should be | |
8604 | using symbolic names anyway, and the common ones like | |
8605 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8606 | ||
8607 | sigfirst = siglast = (int) | |
2ea28649 | 8608 | gdb_signal_from_command (atoi (*argv)); |
c906108c SS |
8609 | if ((*argv)[digits] == '-') |
8610 | { | |
8611 | siglast = (int) | |
2ea28649 | 8612 | gdb_signal_from_command (atoi ((*argv) + digits + 1)); |
c906108c SS |
8613 | } |
8614 | if (sigfirst > siglast) | |
8615 | { | |
1777feb0 | 8616 | /* Bet he didn't figure we'd think of this case... */ |
c906108c SS |
8617 | signum = sigfirst; |
8618 | sigfirst = siglast; | |
8619 | siglast = signum; | |
8620 | } | |
8621 | } | |
8622 | else | |
8623 | { | |
2ea28649 | 8624 | oursig = gdb_signal_from_name (*argv); |
a493e3e2 | 8625 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8626 | { |
8627 | sigfirst = siglast = (int) oursig; | |
8628 | } | |
8629 | else | |
8630 | { | |
8631 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 8632 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
8633 | } |
8634 | } | |
8635 | ||
8636 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8637 | which signals to apply actions to. */ |
c906108c SS |
8638 | |
8639 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
8640 | { | |
2ea28649 | 8641 | switch ((enum gdb_signal) signum) |
c906108c | 8642 | { |
a493e3e2 PA |
8643 | case GDB_SIGNAL_TRAP: |
8644 | case GDB_SIGNAL_INT: | |
c906108c SS |
8645 | if (!allsigs && !sigs[signum]) |
8646 | { | |
9e2f0ad4 | 8647 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8648 | Are you sure you want to change it? "), |
2ea28649 | 8649 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8650 | { |
8651 | sigs[signum] = 1; | |
8652 | } | |
8653 | else | |
8654 | { | |
a3f17187 | 8655 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8656 | gdb_flush (gdb_stdout); |
8657 | } | |
8658 | } | |
8659 | break; | |
a493e3e2 PA |
8660 | case GDB_SIGNAL_0: |
8661 | case GDB_SIGNAL_DEFAULT: | |
8662 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8663 | /* Make sure that "all" doesn't print these. */ |
8664 | break; | |
8665 | default: | |
8666 | sigs[signum] = 1; | |
8667 | break; | |
8668 | } | |
8669 | } | |
8670 | ||
8671 | argv++; | |
8672 | } | |
8673 | ||
3a031f65 PA |
8674 | for (signum = 0; signum < nsigs; signum++) |
8675 | if (sigs[signum]) | |
8676 | { | |
2455069d | 8677 | signal_cache_update (-1); |
a493e3e2 PA |
8678 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); |
8679 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); | |
c906108c | 8680 | |
3a031f65 PA |
8681 | if (from_tty) |
8682 | { | |
8683 | /* Show the results. */ | |
8684 | sig_print_header (); | |
8685 | for (; signum < nsigs; signum++) | |
8686 | if (sigs[signum]) | |
aead7601 | 8687 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8688 | } |
8689 | ||
8690 | break; | |
8691 | } | |
c906108c SS |
8692 | |
8693 | do_cleanups (old_chain); | |
8694 | } | |
8695 | ||
de0bea00 MF |
8696 | /* Complete the "handle" command. */ |
8697 | ||
8698 | static VEC (char_ptr) * | |
8699 | handle_completer (struct cmd_list_element *ignore, | |
6f937416 | 8700 | const char *text, const char *word) |
de0bea00 MF |
8701 | { |
8702 | VEC (char_ptr) *vec_signals, *vec_keywords, *return_val; | |
8703 | static const char * const keywords[] = | |
8704 | { | |
8705 | "all", | |
8706 | "stop", | |
8707 | "ignore", | |
8708 | "print", | |
8709 | "pass", | |
8710 | "nostop", | |
8711 | "noignore", | |
8712 | "noprint", | |
8713 | "nopass", | |
8714 | NULL, | |
8715 | }; | |
8716 | ||
8717 | vec_signals = signal_completer (ignore, text, word); | |
8718 | vec_keywords = complete_on_enum (keywords, word, word); | |
8719 | ||
8720 | return_val = VEC_merge (char_ptr, vec_signals, vec_keywords); | |
8721 | VEC_free (char_ptr, vec_signals); | |
8722 | VEC_free (char_ptr, vec_keywords); | |
8723 | return return_val; | |
8724 | } | |
8725 | ||
2ea28649 PA |
8726 | enum gdb_signal |
8727 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8728 | { |
8729 | if (num >= 1 && num <= 15) | |
2ea28649 | 8730 | return (enum gdb_signal) num; |
ed01b82c PA |
8731 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8732 | Use \"info signals\" for a list of symbolic signals.")); | |
8733 | } | |
8734 | ||
c906108c SS |
8735 | /* Print current contents of the tables set by the handle command. |
8736 | It is possible we should just be printing signals actually used | |
8737 | by the current target (but for things to work right when switching | |
8738 | targets, all signals should be in the signal tables). */ | |
8739 | ||
8740 | static void | |
96baa820 | 8741 | signals_info (char *signum_exp, int from_tty) |
c906108c | 8742 | { |
2ea28649 | 8743 | enum gdb_signal oursig; |
abbb1732 | 8744 | |
c906108c SS |
8745 | sig_print_header (); |
8746 | ||
8747 | if (signum_exp) | |
8748 | { | |
8749 | /* First see if this is a symbol name. */ | |
2ea28649 | 8750 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8751 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8752 | { |
8753 | /* No, try numeric. */ | |
8754 | oursig = | |
2ea28649 | 8755 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8756 | } |
8757 | sig_print_info (oursig); | |
8758 | return; | |
8759 | } | |
8760 | ||
8761 | printf_filtered ("\n"); | |
8762 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8763 | for (oursig = GDB_SIGNAL_FIRST; |
8764 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8765 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8766 | { |
8767 | QUIT; | |
8768 | ||
a493e3e2 PA |
8769 | if (oursig != GDB_SIGNAL_UNKNOWN |
8770 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8771 | sig_print_info (oursig); |
8772 | } | |
8773 | ||
3e43a32a MS |
8774 | printf_filtered (_("\nUse the \"handle\" command " |
8775 | "to change these tables.\n")); | |
c906108c | 8776 | } |
4aa995e1 PA |
8777 | |
8778 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8779 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8780 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8781 | also dependent on which thread you have selected. |
8782 | ||
8783 | 1. making $_siginfo be an internalvar that creates a new value on | |
8784 | access. | |
8785 | ||
8786 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8787 | ||
8788 | /* This function implements the lval_computed support for reading a | |
8789 | $_siginfo value. */ | |
8790 | ||
8791 | static void | |
8792 | siginfo_value_read (struct value *v) | |
8793 | { | |
8794 | LONGEST transferred; | |
8795 | ||
a911d87a PA |
8796 | /* If we can access registers, so can we access $_siginfo. Likewise |
8797 | vice versa. */ | |
8798 | validate_registers_access (); | |
c709acd1 | 8799 | |
4aa995e1 PA |
8800 | transferred = |
8801 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
8802 | NULL, | |
8803 | value_contents_all_raw (v), | |
8804 | value_offset (v), | |
8805 | TYPE_LENGTH (value_type (v))); | |
8806 | ||
8807 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8808 | error (_("Unable to read siginfo")); | |
8809 | } | |
8810 | ||
8811 | /* This function implements the lval_computed support for writing a | |
8812 | $_siginfo value. */ | |
8813 | ||
8814 | static void | |
8815 | siginfo_value_write (struct value *v, struct value *fromval) | |
8816 | { | |
8817 | LONGEST transferred; | |
8818 | ||
a911d87a PA |
8819 | /* If we can access registers, so can we access $_siginfo. Likewise |
8820 | vice versa. */ | |
8821 | validate_registers_access (); | |
c709acd1 | 8822 | |
4aa995e1 PA |
8823 | transferred = target_write (¤t_target, |
8824 | TARGET_OBJECT_SIGNAL_INFO, | |
8825 | NULL, | |
8826 | value_contents_all_raw (fromval), | |
8827 | value_offset (v), | |
8828 | TYPE_LENGTH (value_type (fromval))); | |
8829 | ||
8830 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8831 | error (_("Unable to write siginfo")); | |
8832 | } | |
8833 | ||
c8f2448a | 8834 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8835 | { |
8836 | siginfo_value_read, | |
8837 | siginfo_value_write | |
8838 | }; | |
8839 | ||
8840 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8841 | the current thread using architecture GDBARCH. Return a void value |
8842 | if there's no object available. */ | |
4aa995e1 | 8843 | |
2c0b251b | 8844 | static struct value * |
22d2b532 SDJ |
8845 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8846 | void *ignore) | |
4aa995e1 | 8847 | { |
4aa995e1 | 8848 | if (target_has_stack |
78267919 UW |
8849 | && !ptid_equal (inferior_ptid, null_ptid) |
8850 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
4aa995e1 | 8851 | { |
78267919 | 8852 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8853 | |
78267919 | 8854 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8855 | } |
8856 | ||
78267919 | 8857 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8858 | } |
8859 | ||
c906108c | 8860 | \f |
16c381f0 JK |
8861 | /* infcall_suspend_state contains state about the program itself like its |
8862 | registers and any signal it received when it last stopped. | |
8863 | This state must be restored regardless of how the inferior function call | |
8864 | ends (either successfully, or after it hits a breakpoint or signal) | |
8865 | if the program is to properly continue where it left off. */ | |
8866 | ||
8867 | struct infcall_suspend_state | |
7a292a7a | 8868 | { |
16c381f0 | 8869 | struct thread_suspend_state thread_suspend; |
16c381f0 JK |
8870 | |
8871 | /* Other fields: */ | |
7a292a7a | 8872 | CORE_ADDR stop_pc; |
b89667eb | 8873 | struct regcache *registers; |
1736ad11 | 8874 | |
35515841 | 8875 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
1736ad11 JK |
8876 | struct gdbarch *siginfo_gdbarch; |
8877 | ||
8878 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8879 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8880 | content would be invalid. */ | |
8881 | gdb_byte *siginfo_data; | |
b89667eb DE |
8882 | }; |
8883 | ||
16c381f0 JK |
8884 | struct infcall_suspend_state * |
8885 | save_infcall_suspend_state (void) | |
b89667eb | 8886 | { |
16c381f0 | 8887 | struct infcall_suspend_state *inf_state; |
b89667eb | 8888 | struct thread_info *tp = inferior_thread (); |
1736ad11 JK |
8889 | struct regcache *regcache = get_current_regcache (); |
8890 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
8891 | gdb_byte *siginfo_data = NULL; | |
8892 | ||
8893 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8894 | { | |
8895 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8896 | size_t len = TYPE_LENGTH (type); | |
8897 | struct cleanup *back_to; | |
8898 | ||
224c3ddb | 8899 | siginfo_data = (gdb_byte *) xmalloc (len); |
1736ad11 JK |
8900 | back_to = make_cleanup (xfree, siginfo_data); |
8901 | ||
8902 | if (target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8903 | siginfo_data, 0, len) == len) | |
8904 | discard_cleanups (back_to); | |
8905 | else | |
8906 | { | |
8907 | /* Errors ignored. */ | |
8908 | do_cleanups (back_to); | |
8909 | siginfo_data = NULL; | |
8910 | } | |
8911 | } | |
8912 | ||
41bf6aca | 8913 | inf_state = XCNEW (struct infcall_suspend_state); |
1736ad11 JK |
8914 | |
8915 | if (siginfo_data) | |
8916 | { | |
8917 | inf_state->siginfo_gdbarch = gdbarch; | |
8918 | inf_state->siginfo_data = siginfo_data; | |
8919 | } | |
b89667eb | 8920 | |
16c381f0 | 8921 | inf_state->thread_suspend = tp->suspend; |
16c381f0 | 8922 | |
35515841 | 8923 | /* run_inferior_call will not use the signal due to its `proceed' call with |
a493e3e2 PA |
8924 | GDB_SIGNAL_0 anyway. */ |
8925 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
35515841 | 8926 | |
b89667eb DE |
8927 | inf_state->stop_pc = stop_pc; |
8928 | ||
1736ad11 | 8929 | inf_state->registers = regcache_dup (regcache); |
b89667eb DE |
8930 | |
8931 | return inf_state; | |
8932 | } | |
8933 | ||
8934 | /* Restore inferior session state to INF_STATE. */ | |
8935 | ||
8936 | void | |
16c381f0 | 8937 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8938 | { |
8939 | struct thread_info *tp = inferior_thread (); | |
1736ad11 JK |
8940 | struct regcache *regcache = get_current_regcache (); |
8941 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
b89667eb | 8942 | |
16c381f0 | 8943 | tp->suspend = inf_state->thread_suspend; |
16c381f0 | 8944 | |
b89667eb DE |
8945 | stop_pc = inf_state->stop_pc; |
8946 | ||
1736ad11 JK |
8947 | if (inf_state->siginfo_gdbarch == gdbarch) |
8948 | { | |
8949 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
1736ad11 JK |
8950 | |
8951 | /* Errors ignored. */ | |
8952 | target_write (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6acef6cd | 8953 | inf_state->siginfo_data, 0, TYPE_LENGTH (type)); |
1736ad11 JK |
8954 | } |
8955 | ||
b89667eb DE |
8956 | /* The inferior can be gone if the user types "print exit(0)" |
8957 | (and perhaps other times). */ | |
8958 | if (target_has_execution) | |
8959 | /* NB: The register write goes through to the target. */ | |
1736ad11 | 8960 | regcache_cpy (regcache, inf_state->registers); |
803b5f95 | 8961 | |
16c381f0 | 8962 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8963 | } |
8964 | ||
8965 | static void | |
16c381f0 | 8966 | do_restore_infcall_suspend_state_cleanup (void *state) |
b89667eb | 8967 | { |
9a3c8263 | 8968 | restore_infcall_suspend_state ((struct infcall_suspend_state *) state); |
b89667eb DE |
8969 | } |
8970 | ||
8971 | struct cleanup * | |
16c381f0 JK |
8972 | make_cleanup_restore_infcall_suspend_state |
8973 | (struct infcall_suspend_state *inf_state) | |
b89667eb | 8974 | { |
16c381f0 | 8975 | return make_cleanup (do_restore_infcall_suspend_state_cleanup, inf_state); |
b89667eb DE |
8976 | } |
8977 | ||
8978 | void | |
16c381f0 | 8979 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8980 | { |
8981 | regcache_xfree (inf_state->registers); | |
803b5f95 | 8982 | xfree (inf_state->siginfo_data); |
b89667eb DE |
8983 | xfree (inf_state); |
8984 | } | |
8985 | ||
8986 | struct regcache * | |
16c381f0 | 8987 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8988 | { |
8989 | return inf_state->registers; | |
8990 | } | |
8991 | ||
16c381f0 JK |
8992 | /* infcall_control_state contains state regarding gdb's control of the |
8993 | inferior itself like stepping control. It also contains session state like | |
8994 | the user's currently selected frame. */ | |
b89667eb | 8995 | |
16c381f0 | 8996 | struct infcall_control_state |
b89667eb | 8997 | { |
16c381f0 JK |
8998 | struct thread_control_state thread_control; |
8999 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
9000 | |
9001 | /* Other fields: */ | |
9002 | enum stop_stack_kind stop_stack_dummy; | |
9003 | int stopped_by_random_signal; | |
7a292a7a | 9004 | |
b89667eb | 9005 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe | 9006 | struct frame_id selected_frame_id; |
7a292a7a SS |
9007 | }; |
9008 | ||
c906108c | 9009 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9010 | connection. */ |
c906108c | 9011 | |
16c381f0 JK |
9012 | struct infcall_control_state * |
9013 | save_infcall_control_state (void) | |
c906108c | 9014 | { |
8d749320 SM |
9015 | struct infcall_control_state *inf_status = |
9016 | XNEW (struct infcall_control_state); | |
4e1c45ea | 9017 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9018 | struct inferior *inf = current_inferior (); |
7a292a7a | 9019 | |
16c381f0 JK |
9020 | inf_status->thread_control = tp->control; |
9021 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9022 | |
8358c15c | 9023 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9024 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9025 | |
16c381f0 JK |
9026 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9027 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9028 | hand them back the original chain when restore_infcall_control_state is | |
9029 | called. */ | |
9030 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9031 | |
9032 | /* Other fields: */ | |
9033 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9034 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9035 | |
206415a3 | 9036 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 9037 | |
7a292a7a | 9038 | return inf_status; |
c906108c SS |
9039 | } |
9040 | ||
c906108c | 9041 | static int |
96baa820 | 9042 | restore_selected_frame (void *args) |
c906108c | 9043 | { |
488f131b | 9044 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 9045 | struct frame_info *frame; |
c906108c | 9046 | |
101dcfbe | 9047 | frame = frame_find_by_id (*fid); |
c906108c | 9048 | |
aa0cd9c1 AC |
9049 | /* If inf_status->selected_frame_id is NULL, there was no previously |
9050 | selected frame. */ | |
101dcfbe | 9051 | if (frame == NULL) |
c906108c | 9052 | { |
8a3fe4f8 | 9053 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
9054 | return 0; |
9055 | } | |
9056 | ||
0f7d239c | 9057 | select_frame (frame); |
c906108c SS |
9058 | |
9059 | return (1); | |
9060 | } | |
9061 | ||
b89667eb DE |
9062 | /* Restore inferior session state to INF_STATUS. */ |
9063 | ||
c906108c | 9064 | void |
16c381f0 | 9065 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9066 | { |
4e1c45ea | 9067 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9068 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9069 | |
8358c15c JK |
9070 | if (tp->control.step_resume_breakpoint) |
9071 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9072 | ||
5b79abe7 TT |
9073 | if (tp->control.exception_resume_breakpoint) |
9074 | tp->control.exception_resume_breakpoint->disposition | |
9075 | = disp_del_at_next_stop; | |
9076 | ||
d82142e2 | 9077 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9078 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9079 | |
16c381f0 JK |
9080 | tp->control = inf_status->thread_control; |
9081 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9082 | |
9083 | /* Other fields: */ | |
9084 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9085 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9086 | |
b89667eb | 9087 | if (target_has_stack) |
c906108c | 9088 | { |
c906108c | 9089 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
9090 | walking the stack might encounter a garbage pointer and |
9091 | error() trying to dereference it. */ | |
488f131b JB |
9092 | if (catch_errors |
9093 | (restore_selected_frame, &inf_status->selected_frame_id, | |
9094 | "Unable to restore previously selected frame:\n", | |
9095 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
9096 | /* Error in restoring the selected frame. Select the innermost |
9097 | frame. */ | |
0f7d239c | 9098 | select_frame (get_current_frame ()); |
c906108c | 9099 | } |
c906108c | 9100 | |
72cec141 | 9101 | xfree (inf_status); |
7a292a7a | 9102 | } |
c906108c | 9103 | |
74b7792f | 9104 | static void |
16c381f0 | 9105 | do_restore_infcall_control_state_cleanup (void *sts) |
74b7792f | 9106 | { |
9a3c8263 | 9107 | restore_infcall_control_state ((struct infcall_control_state *) sts); |
74b7792f AC |
9108 | } |
9109 | ||
9110 | struct cleanup * | |
16c381f0 JK |
9111 | make_cleanup_restore_infcall_control_state |
9112 | (struct infcall_control_state *inf_status) | |
74b7792f | 9113 | { |
16c381f0 | 9114 | return make_cleanup (do_restore_infcall_control_state_cleanup, inf_status); |
74b7792f AC |
9115 | } |
9116 | ||
c906108c | 9117 | void |
16c381f0 | 9118 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9119 | { |
8358c15c JK |
9120 | if (inf_status->thread_control.step_resume_breakpoint) |
9121 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9122 | = disp_del_at_next_stop; | |
9123 | ||
5b79abe7 TT |
9124 | if (inf_status->thread_control.exception_resume_breakpoint) |
9125 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9126 | = disp_del_at_next_stop; | |
9127 | ||
1777feb0 | 9128 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9129 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9130 | |
72cec141 | 9131 | xfree (inf_status); |
7a292a7a | 9132 | } |
b89667eb | 9133 | \f |
ca6724c1 KB |
9134 | /* restore_inferior_ptid() will be used by the cleanup machinery |
9135 | to restore the inferior_ptid value saved in a call to | |
9136 | save_inferior_ptid(). */ | |
ce696e05 KB |
9137 | |
9138 | static void | |
9139 | restore_inferior_ptid (void *arg) | |
9140 | { | |
9a3c8263 | 9141 | ptid_t *saved_ptid_ptr = (ptid_t *) arg; |
abbb1732 | 9142 | |
ce696e05 KB |
9143 | inferior_ptid = *saved_ptid_ptr; |
9144 | xfree (arg); | |
9145 | } | |
9146 | ||
9147 | /* Save the value of inferior_ptid so that it may be restored by a | |
9148 | later call to do_cleanups(). Returns the struct cleanup pointer | |
9149 | needed for later doing the cleanup. */ | |
9150 | ||
9151 | struct cleanup * | |
9152 | save_inferior_ptid (void) | |
9153 | { | |
8d749320 | 9154 | ptid_t *saved_ptid_ptr = XNEW (ptid_t); |
ce696e05 | 9155 | |
ce696e05 KB |
9156 | *saved_ptid_ptr = inferior_ptid; |
9157 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
9158 | } | |
0c557179 | 9159 | |
7f89fd65 | 9160 | /* See infrun.h. */ |
0c557179 SDJ |
9161 | |
9162 | void | |
9163 | clear_exit_convenience_vars (void) | |
9164 | { | |
9165 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9166 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9167 | } | |
c5aa993b | 9168 | \f |
488f131b | 9169 | |
b2175913 MS |
9170 | /* User interface for reverse debugging: |
9171 | Set exec-direction / show exec-direction commands | |
9172 | (returns error unless target implements to_set_exec_direction method). */ | |
9173 | ||
170742de | 9174 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9175 | static const char exec_forward[] = "forward"; |
9176 | static const char exec_reverse[] = "reverse"; | |
9177 | static const char *exec_direction = exec_forward; | |
40478521 | 9178 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9179 | exec_forward, |
9180 | exec_reverse, | |
9181 | NULL | |
9182 | }; | |
9183 | ||
9184 | static void | |
9185 | set_exec_direction_func (char *args, int from_tty, | |
9186 | struct cmd_list_element *cmd) | |
9187 | { | |
9188 | if (target_can_execute_reverse) | |
9189 | { | |
9190 | if (!strcmp (exec_direction, exec_forward)) | |
9191 | execution_direction = EXEC_FORWARD; | |
9192 | else if (!strcmp (exec_direction, exec_reverse)) | |
9193 | execution_direction = EXEC_REVERSE; | |
9194 | } | |
8bbed405 MS |
9195 | else |
9196 | { | |
9197 | exec_direction = exec_forward; | |
9198 | error (_("Target does not support this operation.")); | |
9199 | } | |
b2175913 MS |
9200 | } |
9201 | ||
9202 | static void | |
9203 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9204 | struct cmd_list_element *cmd, const char *value) | |
9205 | { | |
9206 | switch (execution_direction) { | |
9207 | case EXEC_FORWARD: | |
9208 | fprintf_filtered (out, _("Forward.\n")); | |
9209 | break; | |
9210 | case EXEC_REVERSE: | |
9211 | fprintf_filtered (out, _("Reverse.\n")); | |
9212 | break; | |
b2175913 | 9213 | default: |
d8b34453 PA |
9214 | internal_error (__FILE__, __LINE__, |
9215 | _("bogus execution_direction value: %d"), | |
9216 | (int) execution_direction); | |
b2175913 MS |
9217 | } |
9218 | } | |
9219 | ||
d4db2f36 PA |
9220 | static void |
9221 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9222 | struct cmd_list_element *c, const char *value) | |
9223 | { | |
3e43a32a MS |
9224 | fprintf_filtered (file, _("Resuming the execution of threads " |
9225 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9226 | } |
ad52ddc6 | 9227 | |
22d2b532 SDJ |
9228 | /* Implementation of `siginfo' variable. */ |
9229 | ||
9230 | static const struct internalvar_funcs siginfo_funcs = | |
9231 | { | |
9232 | siginfo_make_value, | |
9233 | NULL, | |
9234 | NULL | |
9235 | }; | |
9236 | ||
372316f1 PA |
9237 | /* Callback for infrun's target events source. This is marked when a |
9238 | thread has a pending status to process. */ | |
9239 | ||
9240 | static void | |
9241 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9242 | { | |
372316f1 PA |
9243 | inferior_event_handler (INF_REG_EVENT, NULL); |
9244 | } | |
9245 | ||
c906108c | 9246 | void |
96baa820 | 9247 | _initialize_infrun (void) |
c906108c | 9248 | { |
52f0bd74 AC |
9249 | int i; |
9250 | int numsigs; | |
de0bea00 | 9251 | struct cmd_list_element *c; |
c906108c | 9252 | |
372316f1 PA |
9253 | /* Register extra event sources in the event loop. */ |
9254 | infrun_async_inferior_event_token | |
9255 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
9256 | ||
1bedd215 AC |
9257 | add_info ("signals", signals_info, _("\ |
9258 | What debugger does when program gets various signals.\n\ | |
9259 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9260 | add_info_alias ("handle", "signals", 0); |
9261 | ||
de0bea00 | 9262 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9263 | Specify how to handle signals.\n\ |
486c7739 | 9264 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9265 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9266 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9267 | will be displayed instead.\n\ |
9268 | \n\ | |
c906108c SS |
9269 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9270 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9271 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9272 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9273 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9274 | \n\ |
1bedd215 | 9275 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9276 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9277 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9278 | Print means print a message if this signal happens.\n\ | |
9279 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9280 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9281 | Pass and Stop may be combined.\n\ |
9282 | \n\ | |
9283 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9284 | may be interspersed with actions, with the actions being performed for\n\ | |
9285 | all signals cumulatively specified.")); | |
de0bea00 | 9286 | set_cmd_completer (c, handle_completer); |
486c7739 | 9287 | |
c906108c | 9288 | if (!dbx_commands) |
1a966eab AC |
9289 | stop_command = add_cmd ("stop", class_obscure, |
9290 | not_just_help_class_command, _("\ | |
9291 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9292 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9293 | of the program stops."), &cmdlist); |
c906108c | 9294 | |
ccce17b0 | 9295 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9296 | Set inferior debugging."), _("\ |
9297 | Show inferior debugging."), _("\ | |
9298 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9299 | NULL, |
9300 | show_debug_infrun, | |
9301 | &setdebuglist, &showdebuglist); | |
527159b7 | 9302 | |
3e43a32a MS |
9303 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9304 | &debug_displaced, _("\ | |
237fc4c9 PA |
9305 | Set displaced stepping debugging."), _("\ |
9306 | Show displaced stepping debugging."), _("\ | |
9307 | When non-zero, displaced stepping specific debugging is enabled."), | |
9308 | NULL, | |
9309 | show_debug_displaced, | |
9310 | &setdebuglist, &showdebuglist); | |
9311 | ||
ad52ddc6 PA |
9312 | add_setshow_boolean_cmd ("non-stop", no_class, |
9313 | &non_stop_1, _("\ | |
9314 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9315 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9316 | When debugging a multi-threaded program and this setting is\n\ | |
9317 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9318 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9319 | all other threads in the program while you interact with the thread of\n\ | |
9320 | interest. When you continue or step a thread, you can allow the other\n\ | |
9321 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9322 | thread's state, all threads stop.\n\ | |
9323 | \n\ | |
9324 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9325 | to run freely. You'll be able to step each thread independently,\n\ | |
9326 | leave it stopped or free to run as needed."), | |
9327 | set_non_stop, | |
9328 | show_non_stop, | |
9329 | &setlist, | |
9330 | &showlist); | |
9331 | ||
a493e3e2 | 9332 | numsigs = (int) GDB_SIGNAL_LAST; |
8d749320 SM |
9333 | signal_stop = XNEWVEC (unsigned char, numsigs); |
9334 | signal_print = XNEWVEC (unsigned char, numsigs); | |
9335 | signal_program = XNEWVEC (unsigned char, numsigs); | |
9336 | signal_catch = XNEWVEC (unsigned char, numsigs); | |
9337 | signal_pass = XNEWVEC (unsigned char, numsigs); | |
c906108c SS |
9338 | for (i = 0; i < numsigs; i++) |
9339 | { | |
9340 | signal_stop[i] = 1; | |
9341 | signal_print[i] = 1; | |
9342 | signal_program[i] = 1; | |
ab04a2af | 9343 | signal_catch[i] = 0; |
c906108c SS |
9344 | } |
9345 | ||
4d9d9d04 PA |
9346 | /* Signals caused by debugger's own actions should not be given to |
9347 | the program afterwards. | |
9348 | ||
9349 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9350 | explicitly specifies that it should be delivered to the target | |
9351 | program. Typically, that would occur when a user is debugging a | |
9352 | target monitor on a simulator: the target monitor sets a | |
9353 | breakpoint; the simulator encounters this breakpoint and halts | |
9354 | the simulation handing control to GDB; GDB, noting that the stop | |
9355 | address doesn't map to any known breakpoint, returns control back | |
9356 | to the simulator; the simulator then delivers the hardware | |
9357 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9358 | debugged. */ | |
a493e3e2 PA |
9359 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9360 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9361 | |
9362 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9363 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9364 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9365 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9366 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9367 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9368 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9369 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9370 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9371 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9372 | signal_print[GDB_SIGNAL_IO] = 0; | |
9373 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9374 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9375 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9376 | signal_print[GDB_SIGNAL_URG] = 0; | |
9377 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9378 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9379 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9380 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9381 | |
cd0fc7c3 SS |
9382 | /* These signals are used internally by user-level thread |
9383 | implementations. (See signal(5) on Solaris.) Like the above | |
9384 | signals, a healthy program receives and handles them as part of | |
9385 | its normal operation. */ | |
a493e3e2 PA |
9386 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9387 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9388 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9389 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9390 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9391 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9392 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9393 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9394 | |
2455069d UW |
9395 | /* Update cached state. */ |
9396 | signal_cache_update (-1); | |
9397 | ||
85c07804 AC |
9398 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9399 | &stop_on_solib_events, _("\ | |
9400 | Set stopping for shared library events."), _("\ | |
9401 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9402 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9403 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9404 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9405 | set_stop_on_solib_events, |
920d2a44 | 9406 | show_stop_on_solib_events, |
85c07804 | 9407 | &setlist, &showlist); |
c906108c | 9408 | |
7ab04401 AC |
9409 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9410 | follow_fork_mode_kind_names, | |
9411 | &follow_fork_mode_string, _("\ | |
9412 | Set debugger response to a program call of fork or vfork."), _("\ | |
9413 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9414 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9415 | parent - the original process is debugged after a fork\n\ | |
9416 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9417 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9418 | By default, the debugger will follow the parent process."), |
9419 | NULL, | |
920d2a44 | 9420 | show_follow_fork_mode_string, |
7ab04401 AC |
9421 | &setlist, &showlist); |
9422 | ||
6c95b8df PA |
9423 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9424 | follow_exec_mode_names, | |
9425 | &follow_exec_mode_string, _("\ | |
9426 | Set debugger response to a program call of exec."), _("\ | |
9427 | Show debugger response to a program call of exec."), _("\ | |
9428 | An exec call replaces the program image of a process.\n\ | |
9429 | \n\ | |
9430 | follow-exec-mode can be:\n\ | |
9431 | \n\ | |
cce7e648 | 9432 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9433 | to this new inferior. The program the process was running before\n\ |
9434 | the exec call can be restarted afterwards by restarting the original\n\ | |
9435 | inferior.\n\ | |
9436 | \n\ | |
9437 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9438 | The new executable image replaces the previous executable loaded in\n\ | |
9439 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9440 | the executable the process was running after the exec call.\n\ | |
9441 | \n\ | |
9442 | By default, the debugger will use the same inferior."), | |
9443 | NULL, | |
9444 | show_follow_exec_mode_string, | |
9445 | &setlist, &showlist); | |
9446 | ||
7ab04401 AC |
9447 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9448 | scheduler_enums, &scheduler_mode, _("\ | |
9449 | Set mode for locking scheduler during execution."), _("\ | |
9450 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9451 | off == no locking (threads may preempt at any time)\n\ |
9452 | on == full locking (no thread except the current thread may run)\n\ | |
9453 | This applies to both normal execution and replay mode.\n\ | |
9454 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9455 | In this mode, other threads may run during other commands.\n\ | |
9456 | This applies to both normal execution and replay mode.\n\ | |
9457 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9458 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9459 | show_scheduler_mode, |
7ab04401 | 9460 | &setlist, &showlist); |
5fbbeb29 | 9461 | |
d4db2f36 PA |
9462 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9463 | Set mode for resuming threads of all processes."), _("\ | |
9464 | Show mode for resuming threads of all processes."), _("\ | |
9465 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9466 | threads of all processes. When off (which is the default), execution\n\ | |
9467 | commands only resume the threads of the current process. The set of\n\ | |
9468 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9469 | mode (see help set scheduler-locking)."), | |
9470 | NULL, | |
9471 | show_schedule_multiple, | |
9472 | &setlist, &showlist); | |
9473 | ||
5bf193a2 AC |
9474 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9475 | Set mode of the step operation."), _("\ | |
9476 | Show mode of the step operation."), _("\ | |
9477 | When set, doing a step over a function without debug line information\n\ | |
9478 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9479 | function is skipped and the step command stops at a different source line."), | |
9480 | NULL, | |
920d2a44 | 9481 | show_step_stop_if_no_debug, |
5bf193a2 | 9482 | &setlist, &showlist); |
ca6724c1 | 9483 | |
72d0e2c5 YQ |
9484 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9485 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9486 | Set debugger's willingness to use displaced stepping."), _("\ |
9487 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9488 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9489 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9490 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9491 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9492 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9493 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9494 | NULL, |
9495 | show_can_use_displaced_stepping, | |
9496 | &setlist, &showlist); | |
237fc4c9 | 9497 | |
b2175913 MS |
9498 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9499 | &exec_direction, _("Set direction of execution.\n\ | |
9500 | Options are 'forward' or 'reverse'."), | |
9501 | _("Show direction of execution (forward/reverse)."), | |
9502 | _("Tells gdb whether to execute forward or backward."), | |
9503 | set_exec_direction_func, show_exec_direction_func, | |
9504 | &setlist, &showlist); | |
9505 | ||
6c95b8df PA |
9506 | /* Set/show detach-on-fork: user-settable mode. */ |
9507 | ||
9508 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9509 | Set whether gdb will detach the child of a fork."), _("\ | |
9510 | Show whether gdb will detach the child of a fork."), _("\ | |
9511 | Tells gdb whether to detach the child of a fork."), | |
9512 | NULL, NULL, &setlist, &showlist); | |
9513 | ||
03583c20 UW |
9514 | /* Set/show disable address space randomization mode. */ |
9515 | ||
9516 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9517 | &disable_randomization, _("\ | |
9518 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9519 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9520 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9521 | address space is disabled. Standalone programs run with the randomization\n\ | |
9522 | enabled by default on some platforms."), | |
9523 | &set_disable_randomization, | |
9524 | &show_disable_randomization, | |
9525 | &setlist, &showlist); | |
9526 | ||
ca6724c1 | 9527 | /* ptid initializations */ |
ca6724c1 KB |
9528 | inferior_ptid = null_ptid; |
9529 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd PA |
9530 | |
9531 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 9532 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 9533 | observer_attach_thread_exit (infrun_thread_thread_exit); |
fc1cf338 | 9534 | observer_attach_inferior_exit (infrun_inferior_exit); |
4aa995e1 PA |
9535 | |
9536 | /* Explicitly create without lookup, since that tries to create a | |
9537 | value with a void typed value, and when we get here, gdbarch | |
9538 | isn't initialized yet. At this point, we're quite sure there | |
9539 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9540 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9541 | |
9542 | add_setshow_boolean_cmd ("observer", no_class, | |
9543 | &observer_mode_1, _("\ | |
9544 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9545 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9546 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9547 | affect its execution. Registers and memory may not be changed,\n\ | |
9548 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9549 | or signalled."), | |
9550 | set_observer_mode, | |
9551 | show_observer_mode, | |
9552 | &setlist, | |
9553 | &showlist); | |
c906108c | 9554 | } |