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 | |
6d45d4b4 SM |
1713 | xfree (displaced->step_closure); |
1714 | displaced->step_closure = NULL; | |
237fc4c9 PA |
1715 | } |
1716 | ||
1717 | static void | |
fc1cf338 | 1718 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1719 | { |
9a3c8263 SM |
1720 | struct displaced_step_inferior_state *state |
1721 | = (struct displaced_step_inferior_state *) arg; | |
fc1cf338 PA |
1722 | |
1723 | displaced_step_clear (state); | |
237fc4c9 PA |
1724 | } |
1725 | ||
1726 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1727 | void | |
1728 | displaced_step_dump_bytes (struct ui_file *file, | |
1729 | const gdb_byte *buf, | |
1730 | size_t len) | |
1731 | { | |
1732 | int i; | |
1733 | ||
1734 | for (i = 0; i < len; i++) | |
1735 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1736 | fputs_unfiltered ("\n", file); | |
1737 | } | |
1738 | ||
1739 | /* Prepare to single-step, using displaced stepping. | |
1740 | ||
1741 | Note that we cannot use displaced stepping when we have a signal to | |
1742 | deliver. If we have a signal to deliver and an instruction to step | |
1743 | over, then after the step, there will be no indication from the | |
1744 | target whether the thread entered a signal handler or ignored the | |
1745 | signal and stepped over the instruction successfully --- both cases | |
1746 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1747 | fixup, and in the second case we must --- but we can't tell which. | |
1748 | Comments in the code for 'random signals' in handle_inferior_event | |
1749 | explain how we handle this case instead. | |
1750 | ||
1751 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1752 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1753 | if this instruction can't be displaced stepped. */ | |
1754 | ||
237fc4c9 | 1755 | static int |
3fc8eb30 | 1756 | displaced_step_prepare_throw (ptid_t ptid) |
237fc4c9 | 1757 | { |
ad53cd71 | 1758 | struct cleanup *old_cleanups, *ignore_cleanups; |
c1e36e3e | 1759 | struct thread_info *tp = find_thread_ptid (ptid); |
237fc4c9 PA |
1760 | struct regcache *regcache = get_thread_regcache (ptid); |
1761 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
d35ae833 | 1762 | struct address_space *aspace = get_regcache_aspace (regcache); |
237fc4c9 PA |
1763 | CORE_ADDR original, copy; |
1764 | ULONGEST len; | |
1765 | struct displaced_step_closure *closure; | |
fc1cf338 | 1766 | struct displaced_step_inferior_state *displaced; |
9e529e1d | 1767 | int status; |
237fc4c9 PA |
1768 | |
1769 | /* We should never reach this function if the architecture does not | |
1770 | support displaced stepping. */ | |
1771 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1772 | ||
c2829269 PA |
1773 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1774 | gdb_assert (tp->control.trap_expected); | |
1775 | ||
c1e36e3e PA |
1776 | /* Disable range stepping while executing in the scratch pad. We |
1777 | want a single-step even if executing the displaced instruction in | |
1778 | the scratch buffer lands within the stepping range (e.g., a | |
1779 | jump/branch). */ | |
1780 | tp->control.may_range_step = 0; | |
1781 | ||
fc1cf338 PA |
1782 | /* We have to displaced step one thread at a time, as we only have |
1783 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1784 | |
fc1cf338 PA |
1785 | displaced = add_displaced_stepping_state (ptid_get_pid (ptid)); |
1786 | ||
1787 | if (!ptid_equal (displaced->step_ptid, null_ptid)) | |
237fc4c9 PA |
1788 | { |
1789 | /* Already waiting for a displaced step to finish. Defer this | |
1790 | request and place in queue. */ | |
237fc4c9 PA |
1791 | |
1792 | if (debug_displaced) | |
1793 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1794 | "displaced: deferring step of %s\n", |
237fc4c9 PA |
1795 | target_pid_to_str (ptid)); |
1796 | ||
c2829269 | 1797 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1798 | return 0; |
1799 | } | |
1800 | else | |
1801 | { | |
1802 | if (debug_displaced) | |
1803 | fprintf_unfiltered (gdb_stdlog, | |
1804 | "displaced: stepping %s now\n", | |
1805 | target_pid_to_str (ptid)); | |
1806 | } | |
1807 | ||
fc1cf338 | 1808 | displaced_step_clear (displaced); |
237fc4c9 | 1809 | |
ad53cd71 PA |
1810 | old_cleanups = save_inferior_ptid (); |
1811 | inferior_ptid = ptid; | |
1812 | ||
515630c5 | 1813 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1814 | |
1815 | copy = gdbarch_displaced_step_location (gdbarch); | |
1816 | len = gdbarch_max_insn_length (gdbarch); | |
1817 | ||
d35ae833 PA |
1818 | if (breakpoint_in_range_p (aspace, copy, len)) |
1819 | { | |
1820 | /* There's a breakpoint set in the scratch pad location range | |
1821 | (which is usually around the entry point). We'd either | |
1822 | install it before resuming, which would overwrite/corrupt the | |
1823 | scratch pad, or if it was already inserted, this displaced | |
1824 | step would overwrite it. The latter is OK in the sense that | |
1825 | we already assume that no thread is going to execute the code | |
1826 | in the scratch pad range (after initial startup) anyway, but | |
1827 | the former is unacceptable. Simply punt and fallback to | |
1828 | stepping over this breakpoint in-line. */ | |
1829 | if (debug_displaced) | |
1830 | { | |
1831 | fprintf_unfiltered (gdb_stdlog, | |
1832 | "displaced: breakpoint set in scratch pad. " | |
1833 | "Stepping over breakpoint in-line instead.\n"); | |
1834 | } | |
1835 | ||
1836 | do_cleanups (old_cleanups); | |
1837 | return -1; | |
1838 | } | |
1839 | ||
237fc4c9 | 1840 | /* Save the original contents of the copy area. */ |
224c3ddb | 1841 | displaced->step_saved_copy = (gdb_byte *) xmalloc (len); |
ad53cd71 | 1842 | ignore_cleanups = make_cleanup (free_current_contents, |
fc1cf338 | 1843 | &displaced->step_saved_copy); |
9e529e1d JK |
1844 | status = target_read_memory (copy, displaced->step_saved_copy, len); |
1845 | if (status != 0) | |
1846 | throw_error (MEMORY_ERROR, | |
1847 | _("Error accessing memory address %s (%s) for " | |
1848 | "displaced-stepping scratch space."), | |
1849 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1850 | if (debug_displaced) |
1851 | { | |
5af949e3 UW |
1852 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1853 | paddress (gdbarch, copy)); | |
fc1cf338 PA |
1854 | displaced_step_dump_bytes (gdb_stdlog, |
1855 | displaced->step_saved_copy, | |
1856 | len); | |
237fc4c9 PA |
1857 | }; |
1858 | ||
1859 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1860 | original, copy, regcache); |
7f03bd92 PA |
1861 | if (closure == NULL) |
1862 | { | |
1863 | /* The architecture doesn't know how or want to displaced step | |
1864 | this instruction or instruction sequence. Fallback to | |
1865 | stepping over the breakpoint in-line. */ | |
1866 | do_cleanups (old_cleanups); | |
1867 | return -1; | |
1868 | } | |
237fc4c9 | 1869 | |
9f5a595d UW |
1870 | /* Save the information we need to fix things up if the step |
1871 | succeeds. */ | |
fc1cf338 PA |
1872 | displaced->step_ptid = ptid; |
1873 | displaced->step_gdbarch = gdbarch; | |
1874 | displaced->step_closure = closure; | |
1875 | displaced->step_original = original; | |
1876 | displaced->step_copy = copy; | |
9f5a595d | 1877 | |
fc1cf338 | 1878 | make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1879 | |
1880 | /* Resume execution at the copy. */ | |
515630c5 | 1881 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1882 | |
ad53cd71 PA |
1883 | discard_cleanups (ignore_cleanups); |
1884 | ||
1885 | do_cleanups (old_cleanups); | |
237fc4c9 PA |
1886 | |
1887 | if (debug_displaced) | |
5af949e3 UW |
1888 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1889 | paddress (gdbarch, copy)); | |
237fc4c9 | 1890 | |
237fc4c9 PA |
1891 | return 1; |
1892 | } | |
1893 | ||
3fc8eb30 PA |
1894 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1895 | attempts at displaced stepping if we get a memory error. */ | |
1896 | ||
1897 | static int | |
1898 | displaced_step_prepare (ptid_t ptid) | |
1899 | { | |
1900 | int prepared = -1; | |
1901 | ||
1902 | TRY | |
1903 | { | |
1904 | prepared = displaced_step_prepare_throw (ptid); | |
1905 | } | |
1906 | CATCH (ex, RETURN_MASK_ERROR) | |
1907 | { | |
1908 | struct displaced_step_inferior_state *displaced_state; | |
1909 | ||
16b41842 PA |
1910 | if (ex.error != MEMORY_ERROR |
1911 | && ex.error != NOT_SUPPORTED_ERROR) | |
3fc8eb30 PA |
1912 | throw_exception (ex); |
1913 | ||
1914 | if (debug_infrun) | |
1915 | { | |
1916 | fprintf_unfiltered (gdb_stdlog, | |
1917 | "infrun: disabling displaced stepping: %s\n", | |
1918 | ex.message); | |
1919 | } | |
1920 | ||
1921 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1922 | "auto". */ | |
1923 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1924 | { | |
fd7dcb94 | 1925 | warning (_("disabling displaced stepping: %s"), |
3fc8eb30 PA |
1926 | ex.message); |
1927 | } | |
1928 | ||
1929 | /* Disable further displaced stepping attempts. */ | |
1930 | displaced_state | |
1931 | = get_displaced_stepping_state (ptid_get_pid (ptid)); | |
1932 | displaced_state->failed_before = 1; | |
1933 | } | |
1934 | END_CATCH | |
1935 | ||
1936 | return prepared; | |
1937 | } | |
1938 | ||
237fc4c9 | 1939 | static void |
3e43a32a MS |
1940 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1941 | const gdb_byte *myaddr, int len) | |
237fc4c9 PA |
1942 | { |
1943 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
abbb1732 | 1944 | |
237fc4c9 PA |
1945 | inferior_ptid = ptid; |
1946 | write_memory (memaddr, myaddr, len); | |
1947 | do_cleanups (ptid_cleanup); | |
1948 | } | |
1949 | ||
e2d96639 YQ |
1950 | /* Restore the contents of the copy area for thread PTID. */ |
1951 | ||
1952 | static void | |
1953 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1954 | ptid_t ptid) | |
1955 | { | |
1956 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1957 | ||
1958 | write_memory_ptid (ptid, displaced->step_copy, | |
1959 | displaced->step_saved_copy, len); | |
1960 | if (debug_displaced) | |
1961 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
1962 | target_pid_to_str (ptid), | |
1963 | paddress (displaced->step_gdbarch, | |
1964 | displaced->step_copy)); | |
1965 | } | |
1966 | ||
372316f1 PA |
1967 | /* If we displaced stepped an instruction successfully, adjust |
1968 | registers and memory to yield the same effect the instruction would | |
1969 | have had if we had executed it at its original address, and return | |
1970 | 1. If the instruction didn't complete, relocate the PC and return | |
1971 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1972 | ||
1973 | static int | |
2ea28649 | 1974 | displaced_step_fixup (ptid_t event_ptid, enum gdb_signal signal) |
237fc4c9 PA |
1975 | { |
1976 | struct cleanup *old_cleanups; | |
fc1cf338 PA |
1977 | struct displaced_step_inferior_state *displaced |
1978 | = get_displaced_stepping_state (ptid_get_pid (event_ptid)); | |
372316f1 | 1979 | int ret; |
fc1cf338 PA |
1980 | |
1981 | /* Was any thread of this process doing a displaced step? */ | |
1982 | if (displaced == NULL) | |
372316f1 | 1983 | return 0; |
237fc4c9 PA |
1984 | |
1985 | /* Was this event for the pid we displaced? */ | |
fc1cf338 PA |
1986 | if (ptid_equal (displaced->step_ptid, null_ptid) |
1987 | || ! ptid_equal (displaced->step_ptid, event_ptid)) | |
372316f1 | 1988 | return 0; |
237fc4c9 | 1989 | |
fc1cf338 | 1990 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 | 1991 | |
e2d96639 | 1992 | displaced_step_restore (displaced, displaced->step_ptid); |
237fc4c9 | 1993 | |
cb71640d PA |
1994 | /* Fixup may need to read memory/registers. Switch to the thread |
1995 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
1996 | the current thread. */ | |
1997 | switch_to_thread (event_ptid); | |
1998 | ||
237fc4c9 | 1999 | /* Did the instruction complete successfully? */ |
cb71640d PA |
2000 | if (signal == GDB_SIGNAL_TRAP |
2001 | && !(target_stopped_by_watchpoint () | |
2002 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
2003 | || target_have_steppable_watchpoint))) | |
237fc4c9 PA |
2004 | { |
2005 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
2006 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
2007 | displaced->step_closure, | |
2008 | displaced->step_original, | |
2009 | displaced->step_copy, | |
2010 | get_thread_regcache (displaced->step_ptid)); | |
372316f1 | 2011 | ret = 1; |
237fc4c9 PA |
2012 | } |
2013 | else | |
2014 | { | |
2015 | /* Since the instruction didn't complete, all we can do is | |
2016 | relocate the PC. */ | |
515630c5 UW |
2017 | struct regcache *regcache = get_thread_regcache (event_ptid); |
2018 | CORE_ADDR pc = regcache_read_pc (regcache); | |
abbb1732 | 2019 | |
fc1cf338 | 2020 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 2021 | regcache_write_pc (regcache, pc); |
372316f1 | 2022 | ret = -1; |
237fc4c9 PA |
2023 | } |
2024 | ||
2025 | do_cleanups (old_cleanups); | |
2026 | ||
fc1cf338 | 2027 | displaced->step_ptid = null_ptid; |
372316f1 PA |
2028 | |
2029 | return ret; | |
c2829269 | 2030 | } |
1c5cfe86 | 2031 | |
4d9d9d04 PA |
2032 | /* Data to be passed around while handling an event. This data is |
2033 | discarded between events. */ | |
2034 | struct execution_control_state | |
2035 | { | |
2036 | ptid_t ptid; | |
2037 | /* The thread that got the event, if this was a thread event; NULL | |
2038 | otherwise. */ | |
2039 | struct thread_info *event_thread; | |
2040 | ||
2041 | struct target_waitstatus ws; | |
2042 | int stop_func_filled_in; | |
2043 | CORE_ADDR stop_func_start; | |
2044 | CORE_ADDR stop_func_end; | |
2045 | const char *stop_func_name; | |
2046 | int wait_some_more; | |
2047 | ||
2048 | /* True if the event thread hit the single-step breakpoint of | |
2049 | another thread. Thus the event doesn't cause a stop, the thread | |
2050 | needs to be single-stepped past the single-step breakpoint before | |
2051 | we can switch back to the original stepping thread. */ | |
2052 | int hit_singlestep_breakpoint; | |
2053 | }; | |
2054 | ||
2055 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
2056 | |
2057 | static void | |
4d9d9d04 PA |
2058 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
2059 | { | |
2060 | memset (ecs, 0, sizeof (*ecs)); | |
2061 | ecs->event_thread = tp; | |
2062 | ecs->ptid = tp->ptid; | |
2063 | } | |
2064 | ||
2065 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
2066 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 2067 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 2068 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
2069 | |
2070 | /* Are there any pending step-over requests? If so, run all we can | |
2071 | now and return true. Otherwise, return false. */ | |
2072 | ||
2073 | static int | |
c2829269 PA |
2074 | start_step_over (void) |
2075 | { | |
2076 | struct thread_info *tp, *next; | |
2077 | ||
372316f1 PA |
2078 | /* Don't start a new step-over if we already have an in-line |
2079 | step-over operation ongoing. */ | |
2080 | if (step_over_info_valid_p ()) | |
2081 | return 0; | |
2082 | ||
c2829269 | 2083 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 2084 | { |
4d9d9d04 PA |
2085 | struct execution_control_state ecss; |
2086 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 2087 | step_over_what step_what; |
372316f1 | 2088 | int must_be_in_line; |
c2829269 | 2089 | |
c65d6b55 PA |
2090 | gdb_assert (!tp->stop_requested); |
2091 | ||
c2829269 | 2092 | next = thread_step_over_chain_next (tp); |
237fc4c9 | 2093 | |
c2829269 PA |
2094 | /* If this inferior already has a displaced step in process, |
2095 | don't start a new one. */ | |
4d9d9d04 | 2096 | if (displaced_step_in_progress (ptid_get_pid (tp->ptid))) |
c2829269 PA |
2097 | continue; |
2098 | ||
372316f1 PA |
2099 | step_what = thread_still_needs_step_over (tp); |
2100 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
2101 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 2102 | && !use_displaced_stepping (tp))); |
372316f1 PA |
2103 | |
2104 | /* We currently stop all threads of all processes to step-over | |
2105 | in-line. If we need to start a new in-line step-over, let | |
2106 | any pending displaced steps finish first. */ | |
2107 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
2108 | return 0; | |
2109 | ||
c2829269 PA |
2110 | thread_step_over_chain_remove (tp); |
2111 | ||
2112 | if (step_over_queue_head == NULL) | |
2113 | { | |
2114 | if (debug_infrun) | |
2115 | fprintf_unfiltered (gdb_stdlog, | |
2116 | "infrun: step-over queue now empty\n"); | |
2117 | } | |
2118 | ||
372316f1 PA |
2119 | if (tp->control.trap_expected |
2120 | || tp->resumed | |
2121 | || tp->executing) | |
ad53cd71 | 2122 | { |
4d9d9d04 PA |
2123 | internal_error (__FILE__, __LINE__, |
2124 | "[%s] has inconsistent state: " | |
372316f1 | 2125 | "trap_expected=%d, resumed=%d, executing=%d\n", |
4d9d9d04 PA |
2126 | target_pid_to_str (tp->ptid), |
2127 | tp->control.trap_expected, | |
372316f1 | 2128 | tp->resumed, |
4d9d9d04 | 2129 | tp->executing); |
ad53cd71 | 2130 | } |
1c5cfe86 | 2131 | |
4d9d9d04 PA |
2132 | if (debug_infrun) |
2133 | fprintf_unfiltered (gdb_stdlog, | |
2134 | "infrun: resuming [%s] for step-over\n", | |
2135 | target_pid_to_str (tp->ptid)); | |
2136 | ||
2137 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2138 | is no longer inserted. In all-stop, we want to keep looking | |
2139 | for a thread that needs a step-over instead of resuming TP, | |
2140 | because we wouldn't be able to resume anything else until the | |
2141 | target stops again. In non-stop, the resume always resumes | |
2142 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2143 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2144 | continue; |
8550d3b3 | 2145 | |
4d9d9d04 PA |
2146 | switch_to_thread (tp->ptid); |
2147 | reset_ecs (ecs, tp); | |
2148 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2149 | |
4d9d9d04 PA |
2150 | if (!ecs->wait_some_more) |
2151 | error (_("Command aborted.")); | |
1c5cfe86 | 2152 | |
372316f1 PA |
2153 | gdb_assert (tp->resumed); |
2154 | ||
2155 | /* If we started a new in-line step-over, we're done. */ | |
2156 | if (step_over_info_valid_p ()) | |
2157 | { | |
2158 | gdb_assert (tp->control.trap_expected); | |
2159 | return 1; | |
2160 | } | |
2161 | ||
fbea99ea | 2162 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2163 | { |
2164 | /* On all-stop, shouldn't have resumed unless we needed a | |
2165 | step over. */ | |
2166 | gdb_assert (tp->control.trap_expected | |
2167 | || tp->step_after_step_resume_breakpoint); | |
2168 | ||
2169 | /* With remote targets (at least), in all-stop, we can't | |
2170 | issue any further remote commands until the program stops | |
2171 | again. */ | |
2172 | return 1; | |
1c5cfe86 | 2173 | } |
c2829269 | 2174 | |
4d9d9d04 PA |
2175 | /* Either the thread no longer needed a step-over, or a new |
2176 | displaced stepping sequence started. Even in the latter | |
2177 | case, continue looking. Maybe we can also start another | |
2178 | displaced step on a thread of other process. */ | |
237fc4c9 | 2179 | } |
4d9d9d04 PA |
2180 | |
2181 | return 0; | |
237fc4c9 PA |
2182 | } |
2183 | ||
5231c1fd PA |
2184 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2185 | holding OLD_PTID. */ | |
2186 | static void | |
2187 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2188 | { | |
fc1cf338 | 2189 | struct displaced_step_inferior_state *displaced; |
5231c1fd PA |
2190 | |
2191 | if (ptid_equal (inferior_ptid, old_ptid)) | |
2192 | inferior_ptid = new_ptid; | |
2193 | ||
fc1cf338 PA |
2194 | for (displaced = displaced_step_inferior_states; |
2195 | displaced; | |
2196 | displaced = displaced->next) | |
2197 | { | |
2198 | if (ptid_equal (displaced->step_ptid, old_ptid)) | |
2199 | displaced->step_ptid = new_ptid; | |
fc1cf338 | 2200 | } |
5231c1fd PA |
2201 | } |
2202 | ||
237fc4c9 PA |
2203 | \f |
2204 | /* Resuming. */ | |
c906108c SS |
2205 | |
2206 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 2207 | static void |
74b7792f | 2208 | resume_cleanups (void *ignore) |
c906108c | 2209 | { |
34b7e8a6 PA |
2210 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2211 | delete_single_step_breakpoints (inferior_thread ()); | |
7c16b83e | 2212 | |
c906108c SS |
2213 | normal_stop (); |
2214 | } | |
2215 | ||
53904c9e AC |
2216 | static const char schedlock_off[] = "off"; |
2217 | static const char schedlock_on[] = "on"; | |
2218 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2219 | static const char schedlock_replay[] = "replay"; |
40478521 | 2220 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2221 | schedlock_off, |
2222 | schedlock_on, | |
2223 | schedlock_step, | |
f2665db5 | 2224 | schedlock_replay, |
ef346e04 AC |
2225 | NULL |
2226 | }; | |
f2665db5 | 2227 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2228 | static void |
2229 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2230 | struct cmd_list_element *c, const char *value) | |
2231 | { | |
3e43a32a MS |
2232 | fprintf_filtered (file, |
2233 | _("Mode for locking scheduler " | |
2234 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2235 | value); |
2236 | } | |
c906108c SS |
2237 | |
2238 | static void | |
96baa820 | 2239 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2240 | { |
eefe576e AC |
2241 | if (!target_can_lock_scheduler) |
2242 | { | |
2243 | scheduler_mode = schedlock_off; | |
2244 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2245 | } | |
c906108c SS |
2246 | } |
2247 | ||
d4db2f36 PA |
2248 | /* True if execution commands resume all threads of all processes by |
2249 | default; otherwise, resume only threads of the current inferior | |
2250 | process. */ | |
2251 | int sched_multi = 0; | |
2252 | ||
2facfe5c DD |
2253 | /* Try to setup for software single stepping over the specified location. |
2254 | Return 1 if target_resume() should use hardware single step. | |
2255 | ||
2256 | GDBARCH the current gdbarch. | |
2257 | PC the location to step over. */ | |
2258 | ||
2259 | static int | |
2260 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2261 | { | |
2262 | int hw_step = 1; | |
2263 | ||
f02253f1 | 2264 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2265 | && gdbarch_software_single_step_p (gdbarch)) |
2266 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2267 | ||
2facfe5c DD |
2268 | return hw_step; |
2269 | } | |
c906108c | 2270 | |
f3263aa4 PA |
2271 | /* See infrun.h. */ |
2272 | ||
09cee04b PA |
2273 | ptid_t |
2274 | user_visible_resume_ptid (int step) | |
2275 | { | |
f3263aa4 | 2276 | ptid_t resume_ptid; |
09cee04b | 2277 | |
09cee04b PA |
2278 | if (non_stop) |
2279 | { | |
2280 | /* With non-stop mode on, threads are always handled | |
2281 | individually. */ | |
2282 | resume_ptid = inferior_ptid; | |
2283 | } | |
2284 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2285 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2286 | { |
f3263aa4 PA |
2287 | /* User-settable 'scheduler' mode requires solo thread |
2288 | resume. */ | |
09cee04b PA |
2289 | resume_ptid = inferior_ptid; |
2290 | } | |
f2665db5 MM |
2291 | else if ((scheduler_mode == schedlock_replay) |
2292 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2293 | { | |
2294 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2295 | mode. */ | |
2296 | resume_ptid = inferior_ptid; | |
2297 | } | |
f3263aa4 PA |
2298 | else if (!sched_multi && target_supports_multi_process ()) |
2299 | { | |
2300 | /* Resume all threads of the current process (and none of other | |
2301 | processes). */ | |
2302 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
2303 | } | |
2304 | else | |
2305 | { | |
2306 | /* Resume all threads of all processes. */ | |
2307 | resume_ptid = RESUME_ALL; | |
2308 | } | |
09cee04b PA |
2309 | |
2310 | return resume_ptid; | |
2311 | } | |
2312 | ||
fbea99ea PA |
2313 | /* Return a ptid representing the set of threads that we will resume, |
2314 | in the perspective of the target, assuming run control handling | |
2315 | does not require leaving some threads stopped (e.g., stepping past | |
2316 | breakpoint). USER_STEP indicates whether we're about to start the | |
2317 | target for a stepping command. */ | |
2318 | ||
2319 | static ptid_t | |
2320 | internal_resume_ptid (int user_step) | |
2321 | { | |
2322 | /* In non-stop, we always control threads individually. Note that | |
2323 | the target may always work in non-stop mode even with "set | |
2324 | non-stop off", in which case user_visible_resume_ptid could | |
2325 | return a wildcard ptid. */ | |
2326 | if (target_is_non_stop_p ()) | |
2327 | return inferior_ptid; | |
2328 | else | |
2329 | return user_visible_resume_ptid (user_step); | |
2330 | } | |
2331 | ||
64ce06e4 PA |
2332 | /* Wrapper for target_resume, that handles infrun-specific |
2333 | bookkeeping. */ | |
2334 | ||
2335 | static void | |
2336 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2337 | { | |
2338 | struct thread_info *tp = inferior_thread (); | |
2339 | ||
c65d6b55 PA |
2340 | gdb_assert (!tp->stop_requested); |
2341 | ||
64ce06e4 PA |
2342 | /* Install inferior's terminal modes. */ |
2343 | target_terminal_inferior (); | |
2344 | ||
2345 | /* Avoid confusing the next resume, if the next stop/resume | |
2346 | happens to apply to another thread. */ | |
2347 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2348 | ||
8f572e5c PA |
2349 | /* Advise target which signals may be handled silently. |
2350 | ||
2351 | If we have removed breakpoints because we are stepping over one | |
2352 | in-line (in any thread), we need to receive all signals to avoid | |
2353 | accidentally skipping a breakpoint during execution of a signal | |
2354 | handler. | |
2355 | ||
2356 | Likewise if we're displaced stepping, otherwise a trap for a | |
2357 | breakpoint in a signal handler might be confused with the | |
2358 | displaced step finishing. We don't make the displaced_step_fixup | |
2359 | step distinguish the cases instead, because: | |
2360 | ||
2361 | - a backtrace while stopped in the signal handler would show the | |
2362 | scratch pad as frame older than the signal handler, instead of | |
2363 | the real mainline code. | |
2364 | ||
2365 | - when the thread is later resumed, the signal handler would | |
2366 | return to the scratch pad area, which would no longer be | |
2367 | valid. */ | |
2368 | if (step_over_info_valid_p () | |
2369 | || displaced_step_in_progress (ptid_get_pid (tp->ptid))) | |
64ce06e4 PA |
2370 | target_pass_signals (0, NULL); |
2371 | else | |
2372 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
2373 | ||
2374 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2375 | |
2376 | target_commit_resume (); | |
64ce06e4 PA |
2377 | } |
2378 | ||
c906108c SS |
2379 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
2380 | wants to interrupt some lengthy single-stepping operation | |
2381 | (for child processes, the SIGINT goes to the inferior, and so | |
2382 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
2383 | other targets, that's not true). | |
2384 | ||
c906108c SS |
2385 | SIG is the signal to give the inferior (zero for none). */ |
2386 | void | |
64ce06e4 | 2387 | resume (enum gdb_signal sig) |
c906108c | 2388 | { |
74b7792f | 2389 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
2390 | struct regcache *regcache = get_current_regcache (); |
2391 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4e1c45ea | 2392 | struct thread_info *tp = inferior_thread (); |
515630c5 | 2393 | CORE_ADDR pc = regcache_read_pc (regcache); |
6c95b8df | 2394 | struct address_space *aspace = get_regcache_aspace (regcache); |
b0f16a3e | 2395 | ptid_t resume_ptid; |
856e7dd6 PA |
2396 | /* This represents the user's step vs continue request. When |
2397 | deciding whether "set scheduler-locking step" applies, it's the | |
2398 | user's intention that counts. */ | |
2399 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2400 | /* This represents what we'll actually request the target to do. |
2401 | This can decay from a step to a continue, if e.g., we need to | |
2402 | implement single-stepping with breakpoints (software | |
2403 | single-step). */ | |
6b403daa | 2404 | int step; |
c7e8a53c | 2405 | |
c65d6b55 | 2406 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2407 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2408 | ||
c906108c SS |
2409 | QUIT; |
2410 | ||
372316f1 PA |
2411 | if (tp->suspend.waitstatus_pending_p) |
2412 | { | |
2413 | if (debug_infrun) | |
2414 | { | |
2415 | char *statstr; | |
2416 | ||
2417 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
2418 | fprintf_unfiltered (gdb_stdlog, | |
2419 | "infrun: resume: thread %s has pending wait status %s " | |
2420 | "(currently_stepping=%d).\n", | |
2421 | target_pid_to_str (tp->ptid), statstr, | |
2422 | currently_stepping (tp)); | |
2423 | xfree (statstr); | |
2424 | } | |
2425 | ||
2426 | tp->resumed = 1; | |
2427 | ||
2428 | /* FIXME: What should we do if we are supposed to resume this | |
2429 | thread with a signal? Maybe we should maintain a queue of | |
2430 | pending signals to deliver. */ | |
2431 | if (sig != GDB_SIGNAL_0) | |
2432 | { | |
fd7dcb94 | 2433 | warning (_("Couldn't deliver signal %s to %s."), |
372316f1 PA |
2434 | gdb_signal_to_name (sig), target_pid_to_str (tp->ptid)); |
2435 | } | |
2436 | ||
2437 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2438 | discard_cleanups (old_cleanups); | |
2439 | ||
2440 | if (target_can_async_p ()) | |
2441 | target_async (1); | |
2442 | return; | |
2443 | } | |
2444 | ||
2445 | tp->stepped_breakpoint = 0; | |
2446 | ||
6b403daa PA |
2447 | /* Depends on stepped_breakpoint. */ |
2448 | step = currently_stepping (tp); | |
2449 | ||
74609e71 YQ |
2450 | if (current_inferior ()->waiting_for_vfork_done) |
2451 | { | |
48f9886d PA |
2452 | /* Don't try to single-step a vfork parent that is waiting for |
2453 | the child to get out of the shared memory region (by exec'ing | |
2454 | or exiting). This is particularly important on software | |
2455 | single-step archs, as the child process would trip on the | |
2456 | software single step breakpoint inserted for the parent | |
2457 | process. Since the parent will not actually execute any | |
2458 | instruction until the child is out of the shared region (such | |
2459 | are vfork's semantics), it is safe to simply continue it. | |
2460 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2461 | the parent, and tell it to `keep_going', which automatically | |
2462 | re-sets it stepping. */ | |
74609e71 YQ |
2463 | if (debug_infrun) |
2464 | fprintf_unfiltered (gdb_stdlog, | |
2465 | "infrun: resume : clear step\n"); | |
a09dd441 | 2466 | step = 0; |
74609e71 YQ |
2467 | } |
2468 | ||
527159b7 | 2469 | if (debug_infrun) |
237fc4c9 | 2470 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 2471 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 2472 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
2473 | step, gdb_signal_to_symbol_string (sig), |
2474 | tp->control.trap_expected, | |
0d9a9a5f PA |
2475 | target_pid_to_str (inferior_ptid), |
2476 | paddress (gdbarch, pc)); | |
c906108c | 2477 | |
c2c6d25f JM |
2478 | /* Normally, by the time we reach `resume', the breakpoints are either |
2479 | removed or inserted, as appropriate. The exception is if we're sitting | |
2480 | at a permanent breakpoint; we need to step over it, but permanent | |
2481 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2482 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2483 | { |
af48d08f PA |
2484 | if (sig != GDB_SIGNAL_0) |
2485 | { | |
2486 | /* We have a signal to pass to the inferior. The resume | |
2487 | may, or may not take us to the signal handler. If this | |
2488 | is a step, we'll need to stop in the signal handler, if | |
2489 | there's one, (if the target supports stepping into | |
2490 | handlers), or in the next mainline instruction, if | |
2491 | there's no handler. If this is a continue, we need to be | |
2492 | sure to run the handler with all breakpoints inserted. | |
2493 | In all cases, set a breakpoint at the current address | |
2494 | (where the handler returns to), and once that breakpoint | |
2495 | is hit, resume skipping the permanent breakpoint. If | |
2496 | that breakpoint isn't hit, then we've stepped into the | |
2497 | signal handler (or hit some other event). We'll delete | |
2498 | the step-resume breakpoint then. */ | |
2499 | ||
2500 | if (debug_infrun) | |
2501 | fprintf_unfiltered (gdb_stdlog, | |
2502 | "infrun: resume: skipping permanent breakpoint, " | |
2503 | "deliver signal first\n"); | |
2504 | ||
2505 | clear_step_over_info (); | |
2506 | tp->control.trap_expected = 0; | |
2507 | ||
2508 | if (tp->control.step_resume_breakpoint == NULL) | |
2509 | { | |
2510 | /* Set a "high-priority" step-resume, as we don't want | |
2511 | user breakpoints at PC to trigger (again) when this | |
2512 | hits. */ | |
2513 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2514 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2515 | ||
2516 | tp->step_after_step_resume_breakpoint = step; | |
2517 | } | |
2518 | ||
2519 | insert_breakpoints (); | |
2520 | } | |
2521 | else | |
2522 | { | |
2523 | /* There's no signal to pass, we can go ahead and skip the | |
2524 | permanent breakpoint manually. */ | |
2525 | if (debug_infrun) | |
2526 | fprintf_unfiltered (gdb_stdlog, | |
2527 | "infrun: resume: skipping permanent breakpoint\n"); | |
2528 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
2529 | /* Update pc to reflect the new address from which we will | |
2530 | execute instructions. */ | |
2531 | pc = regcache_read_pc (regcache); | |
2532 | ||
2533 | if (step) | |
2534 | { | |
2535 | /* We've already advanced the PC, so the stepping part | |
2536 | is done. Now we need to arrange for a trap to be | |
2537 | reported to handle_inferior_event. Set a breakpoint | |
2538 | at the current PC, and run to it. Don't update | |
2539 | prev_pc, because if we end in | |
44a1ee51 PA |
2540 | switch_back_to_stepped_thread, we want the "expected |
2541 | thread advanced also" branch to be taken. IOW, we | |
2542 | don't want this thread to step further from PC | |
af48d08f | 2543 | (overstep). */ |
1ac806b8 | 2544 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2545 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2546 | insert_breakpoints (); | |
2547 | ||
fbea99ea | 2548 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2549 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
af48d08f | 2550 | discard_cleanups (old_cleanups); |
372316f1 | 2551 | tp->resumed = 1; |
af48d08f PA |
2552 | return; |
2553 | } | |
2554 | } | |
6d350bb5 | 2555 | } |
c2c6d25f | 2556 | |
c1e36e3e PA |
2557 | /* If we have a breakpoint to step over, make sure to do a single |
2558 | step only. Same if we have software watchpoints. */ | |
2559 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2560 | tp->control.may_range_step = 0; | |
2561 | ||
237fc4c9 PA |
2562 | /* If enabled, step over breakpoints by executing a copy of the |
2563 | instruction at a different address. | |
2564 | ||
2565 | We can't use displaced stepping when we have a signal to deliver; | |
2566 | the comments for displaced_step_prepare explain why. The | |
2567 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2568 | signals' explain what we do instead. |
2569 | ||
2570 | We can't use displaced stepping when we are waiting for vfork_done | |
2571 | event, displaced stepping breaks the vfork child similarly as single | |
2572 | step software breakpoint. */ | |
3fc8eb30 PA |
2573 | if (tp->control.trap_expected |
2574 | && use_displaced_stepping (tp) | |
cb71640d | 2575 | && !step_over_info_valid_p () |
a493e3e2 | 2576 | && sig == GDB_SIGNAL_0 |
74609e71 | 2577 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2578 | { |
3fc8eb30 | 2579 | int prepared = displaced_step_prepare (inferior_ptid); |
fc1cf338 | 2580 | |
3fc8eb30 | 2581 | if (prepared == 0) |
d56b7306 | 2582 | { |
4d9d9d04 PA |
2583 | if (debug_infrun) |
2584 | fprintf_unfiltered (gdb_stdlog, | |
2585 | "Got placed in step-over queue\n"); | |
2586 | ||
2587 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2588 | discard_cleanups (old_cleanups); |
2589 | return; | |
2590 | } | |
3fc8eb30 PA |
2591 | else if (prepared < 0) |
2592 | { | |
2593 | /* Fallback to stepping over the breakpoint in-line. */ | |
2594 | ||
2595 | if (target_is_non_stop_p ()) | |
2596 | stop_all_threads (); | |
2597 | ||
2598 | set_step_over_info (get_regcache_aspace (regcache), | |
21edc42f | 2599 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2600 | |
2601 | step = maybe_software_singlestep (gdbarch, pc); | |
2602 | ||
2603 | insert_breakpoints (); | |
2604 | } | |
2605 | else if (prepared > 0) | |
2606 | { | |
2607 | struct displaced_step_inferior_state *displaced; | |
99e40580 | 2608 | |
3fc8eb30 PA |
2609 | /* Update pc to reflect the new address from which we will |
2610 | execute instructions due to displaced stepping. */ | |
2611 | pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); | |
ca7781d2 | 2612 | |
3fc8eb30 PA |
2613 | displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); |
2614 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, | |
2615 | displaced->step_closure); | |
2616 | } | |
237fc4c9 PA |
2617 | } |
2618 | ||
2facfe5c | 2619 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2620 | else if (step) |
2facfe5c | 2621 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2622 | |
30852783 UW |
2623 | /* Currently, our software single-step implementation leads to different |
2624 | results than hardware single-stepping in one situation: when stepping | |
2625 | into delivering a signal which has an associated signal handler, | |
2626 | hardware single-step will stop at the first instruction of the handler, | |
2627 | while software single-step will simply skip execution of the handler. | |
2628 | ||
2629 | For now, this difference in behavior is accepted since there is no | |
2630 | easy way to actually implement single-stepping into a signal handler | |
2631 | without kernel support. | |
2632 | ||
2633 | However, there is one scenario where this difference leads to follow-on | |
2634 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2635 | and then single-stepping. In this case, the software single-step | |
2636 | behavior means that even if there is a *breakpoint* in the signal | |
2637 | handler, GDB still would not stop. | |
2638 | ||
2639 | Fortunately, we can at least fix this particular issue. We detect | |
2640 | here the case where we are about to deliver a signal while software | |
2641 | single-stepping with breakpoints removed. In this situation, we | |
2642 | revert the decisions to remove all breakpoints and insert single- | |
2643 | step breakpoints, and instead we install a step-resume breakpoint | |
2644 | at the current address, deliver the signal without stepping, and | |
2645 | once we arrive back at the step-resume breakpoint, actually step | |
2646 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2647 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2648 | && sig != GDB_SIGNAL_0 |
2649 | && step_over_info_valid_p ()) | |
30852783 UW |
2650 | { |
2651 | /* If we have nested signals or a pending signal is delivered | |
2652 | immediately after a handler returns, might might already have | |
2653 | a step-resume breakpoint set on the earlier handler. We cannot | |
2654 | set another step-resume breakpoint; just continue on until the | |
2655 | original breakpoint is hit. */ | |
2656 | if (tp->control.step_resume_breakpoint == NULL) | |
2657 | { | |
2c03e5be | 2658 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2659 | tp->step_after_step_resume_breakpoint = 1; |
2660 | } | |
2661 | ||
34b7e8a6 | 2662 | delete_single_step_breakpoints (tp); |
30852783 | 2663 | |
31e77af2 | 2664 | clear_step_over_info (); |
30852783 | 2665 | tp->control.trap_expected = 0; |
31e77af2 PA |
2666 | |
2667 | insert_breakpoints (); | |
30852783 UW |
2668 | } |
2669 | ||
b0f16a3e SM |
2670 | /* If STEP is set, it's a request to use hardware stepping |
2671 | facilities. But in that case, we should never | |
2672 | use singlestep breakpoint. */ | |
34b7e8a6 | 2673 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2674 | |
fbea99ea | 2675 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2676 | if (tp->control.trap_expected) |
b0f16a3e SM |
2677 | { |
2678 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2679 | hit, either by single-stepping the thread with the breakpoint |
2680 | removed, or by displaced stepping, with the breakpoint inserted. | |
2681 | In the former case, we need to single-step only this thread, | |
2682 | and keep others stopped, as they can miss this breakpoint if | |
2683 | allowed to run. That's not really a problem for displaced | |
2684 | stepping, but, we still keep other threads stopped, in case | |
2685 | another thread is also stopped for a breakpoint waiting for | |
2686 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2687 | resume_ptid = inferior_ptid; |
2688 | } | |
fbea99ea PA |
2689 | else |
2690 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2691 | |
7f5ef605 PA |
2692 | if (execution_direction != EXEC_REVERSE |
2693 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2694 | { |
372316f1 PA |
2695 | /* There are two cases where we currently need to step a |
2696 | breakpoint instruction when we have a signal to deliver: | |
2697 | ||
2698 | - See handle_signal_stop where we handle random signals that | |
2699 | could take out us out of the stepping range. Normally, in | |
2700 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2701 | signal handler with a breakpoint at PC, but there are cases |
2702 | where we should _always_ single-step, even if we have a | |
2703 | step-resume breakpoint, like when a software watchpoint is | |
2704 | set. Assuming single-stepping and delivering a signal at the | |
2705 | same time would takes us to the signal handler, then we could | |
2706 | have removed the breakpoint at PC to step over it. However, | |
2707 | some hardware step targets (like e.g., Mac OS) can't step | |
2708 | into signal handlers, and for those, we need to leave the | |
2709 | breakpoint at PC inserted, as otherwise if the handler | |
2710 | recurses and executes PC again, it'll miss the breakpoint. | |
2711 | So we leave the breakpoint inserted anyway, but we need to | |
2712 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2713 | that adjust_pc_after_break doesn't end up confused. |
2714 | ||
2715 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2716 | in one thread after another thread that was stepping had been | |
2717 | momentarily paused for a step-over. When we re-resume the | |
2718 | stepping thread, it may be resumed from that address with a | |
2719 | breakpoint that hasn't trapped yet. Seen with | |
2720 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2721 | do displaced stepping. */ | |
2722 | ||
2723 | if (debug_infrun) | |
2724 | fprintf_unfiltered (gdb_stdlog, | |
2725 | "infrun: resume: [%s] stepped breakpoint\n", | |
2726 | target_pid_to_str (tp->ptid)); | |
7f5ef605 PA |
2727 | |
2728 | tp->stepped_breakpoint = 1; | |
2729 | ||
b0f16a3e SM |
2730 | /* Most targets can step a breakpoint instruction, thus |
2731 | executing it normally. But if this one cannot, just | |
2732 | continue and we will hit it anyway. */ | |
7f5ef605 | 2733 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2734 | step = 0; |
2735 | } | |
ef5cf84e | 2736 | |
b0f16a3e | 2737 | if (debug_displaced |
cb71640d | 2738 | && tp->control.trap_expected |
3fc8eb30 | 2739 | && use_displaced_stepping (tp) |
cb71640d | 2740 | && !step_over_info_valid_p ()) |
b0f16a3e | 2741 | { |
d9b67d9f | 2742 | struct regcache *resume_regcache = get_thread_regcache (tp->ptid); |
b0f16a3e SM |
2743 | struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache); |
2744 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); | |
2745 | gdb_byte buf[4]; | |
2746 | ||
2747 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2748 | paddress (resume_gdbarch, actual_pc)); | |
2749 | read_memory (actual_pc, buf, sizeof (buf)); | |
2750 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2751 | } | |
237fc4c9 | 2752 | |
b0f16a3e SM |
2753 | if (tp->control.may_range_step) |
2754 | { | |
2755 | /* If we're resuming a thread with the PC out of the step | |
2756 | range, then we're doing some nested/finer run control | |
2757 | operation, like stepping the thread out of the dynamic | |
2758 | linker or the displaced stepping scratch pad. We | |
2759 | shouldn't have allowed a range step then. */ | |
2760 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2761 | } | |
c1e36e3e | 2762 | |
64ce06e4 | 2763 | do_target_resume (resume_ptid, step, sig); |
372316f1 | 2764 | tp->resumed = 1; |
c906108c SS |
2765 | discard_cleanups (old_cleanups); |
2766 | } | |
2767 | \f | |
237fc4c9 | 2768 | /* Proceeding. */ |
c906108c | 2769 | |
4c2f2a79 PA |
2770 | /* See infrun.h. */ |
2771 | ||
2772 | /* Counter that tracks number of user visible stops. This can be used | |
2773 | to tell whether a command has proceeded the inferior past the | |
2774 | current location. This allows e.g., inferior function calls in | |
2775 | breakpoint commands to not interrupt the command list. When the | |
2776 | call finishes successfully, the inferior is standing at the same | |
2777 | breakpoint as if nothing happened (and so we don't call | |
2778 | normal_stop). */ | |
2779 | static ULONGEST current_stop_id; | |
2780 | ||
2781 | /* See infrun.h. */ | |
2782 | ||
2783 | ULONGEST | |
2784 | get_stop_id (void) | |
2785 | { | |
2786 | return current_stop_id; | |
2787 | } | |
2788 | ||
2789 | /* Called when we report a user visible stop. */ | |
2790 | ||
2791 | static void | |
2792 | new_stop_id (void) | |
2793 | { | |
2794 | current_stop_id++; | |
2795 | } | |
2796 | ||
c906108c SS |
2797 | /* Clear out all variables saying what to do when inferior is continued. |
2798 | First do this, then set the ones you want, then call `proceed'. */ | |
2799 | ||
a7212384 UW |
2800 | static void |
2801 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2802 | { |
a7212384 UW |
2803 | if (debug_infrun) |
2804 | fprintf_unfiltered (gdb_stdlog, | |
2805 | "infrun: clear_proceed_status_thread (%s)\n", | |
2806 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 2807 | |
372316f1 PA |
2808 | /* If we're starting a new sequence, then the previous finished |
2809 | single-step is no longer relevant. */ | |
2810 | if (tp->suspend.waitstatus_pending_p) | |
2811 | { | |
2812 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2813 | { | |
2814 | if (debug_infrun) | |
2815 | fprintf_unfiltered (gdb_stdlog, | |
2816 | "infrun: clear_proceed_status: pending " | |
2817 | "event of %s was a finished step. " | |
2818 | "Discarding.\n", | |
2819 | target_pid_to_str (tp->ptid)); | |
2820 | ||
2821 | tp->suspend.waitstatus_pending_p = 0; | |
2822 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2823 | } | |
2824 | else if (debug_infrun) | |
2825 | { | |
2826 | char *statstr; | |
2827 | ||
2828 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
2829 | fprintf_unfiltered (gdb_stdlog, | |
2830 | "infrun: clear_proceed_status_thread: thread %s " | |
2831 | "has pending wait status %s " | |
2832 | "(currently_stepping=%d).\n", | |
2833 | target_pid_to_str (tp->ptid), statstr, | |
2834 | currently_stepping (tp)); | |
2835 | xfree (statstr); | |
2836 | } | |
2837 | } | |
2838 | ||
70509625 PA |
2839 | /* If this signal should not be seen by program, give it zero. |
2840 | Used for debugging signals. */ | |
2841 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2842 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2843 | ||
243a9253 PA |
2844 | thread_fsm_delete (tp->thread_fsm); |
2845 | tp->thread_fsm = NULL; | |
2846 | ||
16c381f0 JK |
2847 | tp->control.trap_expected = 0; |
2848 | tp->control.step_range_start = 0; | |
2849 | tp->control.step_range_end = 0; | |
c1e36e3e | 2850 | tp->control.may_range_step = 0; |
16c381f0 JK |
2851 | tp->control.step_frame_id = null_frame_id; |
2852 | tp->control.step_stack_frame_id = null_frame_id; | |
2853 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2854 | tp->control.step_start_function = NULL; |
a7212384 | 2855 | tp->stop_requested = 0; |
4e1c45ea | 2856 | |
16c381f0 | 2857 | tp->control.stop_step = 0; |
32400beb | 2858 | |
16c381f0 | 2859 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2860 | |
856e7dd6 | 2861 | tp->control.stepping_command = 0; |
17b2616c | 2862 | |
a7212384 | 2863 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2864 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2865 | } |
32400beb | 2866 | |
a7212384 | 2867 | void |
70509625 | 2868 | clear_proceed_status (int step) |
a7212384 | 2869 | { |
f2665db5 MM |
2870 | /* With scheduler-locking replay, stop replaying other threads if we're |
2871 | not replaying the user-visible resume ptid. | |
2872 | ||
2873 | This is a convenience feature to not require the user to explicitly | |
2874 | stop replaying the other threads. We're assuming that the user's | |
2875 | intent is to resume tracing the recorded process. */ | |
2876 | if (!non_stop && scheduler_mode == schedlock_replay | |
2877 | && target_record_is_replaying (minus_one_ptid) | |
2878 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2879 | execution_direction)) | |
2880 | target_record_stop_replaying (); | |
2881 | ||
6c95b8df PA |
2882 | if (!non_stop) |
2883 | { | |
70509625 PA |
2884 | struct thread_info *tp; |
2885 | ptid_t resume_ptid; | |
2886 | ||
2887 | resume_ptid = user_visible_resume_ptid (step); | |
2888 | ||
2889 | /* In all-stop mode, delete the per-thread status of all threads | |
2890 | we're about to resume, implicitly and explicitly. */ | |
2891 | ALL_NON_EXITED_THREADS (tp) | |
2892 | { | |
2893 | if (!ptid_match (tp->ptid, resume_ptid)) | |
2894 | continue; | |
2895 | clear_proceed_status_thread (tp); | |
2896 | } | |
6c95b8df PA |
2897 | } |
2898 | ||
a7212384 UW |
2899 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2900 | { | |
2901 | struct inferior *inferior; | |
2902 | ||
2903 | if (non_stop) | |
2904 | { | |
6c95b8df PA |
2905 | /* If in non-stop mode, only delete the per-thread status of |
2906 | the current thread. */ | |
a7212384 UW |
2907 | clear_proceed_status_thread (inferior_thread ()); |
2908 | } | |
6c95b8df | 2909 | |
d6b48e9c | 2910 | inferior = current_inferior (); |
16c381f0 | 2911 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2912 | } |
2913 | ||
f3b1572e | 2914 | observer_notify_about_to_proceed (); |
c906108c SS |
2915 | } |
2916 | ||
99619bea PA |
2917 | /* Returns true if TP is still stopped at a breakpoint that needs |
2918 | stepping-over in order to make progress. If the breakpoint is gone | |
2919 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2920 | |
2921 | static int | |
6c4cfb24 | 2922 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2923 | { |
2924 | if (tp->stepping_over_breakpoint) | |
2925 | { | |
2926 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
2927 | ||
2928 | if (breakpoint_here_p (get_regcache_aspace (regcache), | |
af48d08f PA |
2929 | regcache_read_pc (regcache)) |
2930 | == ordinary_breakpoint_here) | |
99619bea PA |
2931 | return 1; |
2932 | ||
2933 | tp->stepping_over_breakpoint = 0; | |
2934 | } | |
2935 | ||
2936 | return 0; | |
2937 | } | |
2938 | ||
6c4cfb24 PA |
2939 | /* Check whether thread TP still needs to start a step-over in order |
2940 | to make progress when resumed. Returns an bitwise or of enum | |
2941 | step_over_what bits, indicating what needs to be stepped over. */ | |
2942 | ||
8d297bbf | 2943 | static step_over_what |
6c4cfb24 PA |
2944 | thread_still_needs_step_over (struct thread_info *tp) |
2945 | { | |
8d297bbf | 2946 | step_over_what what = 0; |
6c4cfb24 PA |
2947 | |
2948 | if (thread_still_needs_step_over_bp (tp)) | |
2949 | what |= STEP_OVER_BREAKPOINT; | |
2950 | ||
2951 | if (tp->stepping_over_watchpoint | |
2952 | && !target_have_steppable_watchpoint) | |
2953 | what |= STEP_OVER_WATCHPOINT; | |
2954 | ||
2955 | return what; | |
2956 | } | |
2957 | ||
483805cf PA |
2958 | /* Returns true if scheduler locking applies. STEP indicates whether |
2959 | we're about to do a step/next-like command to a thread. */ | |
2960 | ||
2961 | static int | |
856e7dd6 | 2962 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2963 | { |
2964 | return (scheduler_mode == schedlock_on | |
2965 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2966 | && tp->control.stepping_command) |
2967 | || (scheduler_mode == schedlock_replay | |
2968 | && target_record_will_replay (minus_one_ptid, | |
2969 | execution_direction))); | |
483805cf PA |
2970 | } |
2971 | ||
c906108c SS |
2972 | /* Basic routine for continuing the program in various fashions. |
2973 | ||
2974 | ADDR is the address to resume at, or -1 for resume where stopped. | |
2975 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 2976 | or -1 for act according to how it stopped. |
c906108c | 2977 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
2978 | -1 means return after that and print nothing. |
2979 | You should probably set various step_... variables | |
2980 | before calling here, if you are stepping. | |
c906108c SS |
2981 | |
2982 | You should call clear_proceed_status before calling proceed. */ | |
2983 | ||
2984 | void | |
64ce06e4 | 2985 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2986 | { |
e58b0e63 PA |
2987 | struct regcache *regcache; |
2988 | struct gdbarch *gdbarch; | |
4e1c45ea | 2989 | struct thread_info *tp; |
e58b0e63 | 2990 | CORE_ADDR pc; |
6c95b8df | 2991 | struct address_space *aspace; |
4d9d9d04 PA |
2992 | ptid_t resume_ptid; |
2993 | struct execution_control_state ecss; | |
2994 | struct execution_control_state *ecs = &ecss; | |
2995 | struct cleanup *old_chain; | |
85ad3aaf | 2996 | struct cleanup *defer_resume_cleanup; |
4d9d9d04 | 2997 | int started; |
c906108c | 2998 | |
e58b0e63 PA |
2999 | /* If we're stopped at a fork/vfork, follow the branch set by the |
3000 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
3001 | resuming the current thread. */ | |
3002 | if (!follow_fork ()) | |
3003 | { | |
3004 | /* The target for some reason decided not to resume. */ | |
3005 | normal_stop (); | |
f148b27e PA |
3006 | if (target_can_async_p ()) |
3007 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
3008 | return; |
3009 | } | |
3010 | ||
842951eb PA |
3011 | /* We'll update this if & when we switch to a new thread. */ |
3012 | previous_inferior_ptid = inferior_ptid; | |
3013 | ||
e58b0e63 PA |
3014 | regcache = get_current_regcache (); |
3015 | gdbarch = get_regcache_arch (regcache); | |
6c95b8df | 3016 | aspace = get_regcache_aspace (regcache); |
e58b0e63 | 3017 | pc = regcache_read_pc (regcache); |
2adfaa28 | 3018 | tp = inferior_thread (); |
e58b0e63 | 3019 | |
99619bea PA |
3020 | /* Fill in with reasonable starting values. */ |
3021 | init_thread_stepping_state (tp); | |
3022 | ||
c2829269 PA |
3023 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
3024 | ||
2acceee2 | 3025 | if (addr == (CORE_ADDR) -1) |
c906108c | 3026 | { |
af48d08f PA |
3027 | if (pc == stop_pc |
3028 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here | |
b2175913 | 3029 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
3030 | /* There is a breakpoint at the address we will resume at, |
3031 | step one instruction before inserting breakpoints so that | |
3032 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
3033 | breakpoint). |
3034 | ||
3035 | Note, we don't do this in reverse, because we won't | |
3036 | actually be executing the breakpoint insn anyway. | |
3037 | We'll be (un-)executing the previous instruction. */ | |
99619bea | 3038 | tp->stepping_over_breakpoint = 1; |
515630c5 UW |
3039 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3040 | && gdbarch_single_step_through_delay (gdbarch, | |
3041 | get_current_frame ())) | |
3352ef37 AC |
3042 | /* We stepped onto an instruction that needs to be stepped |
3043 | again before re-inserting the breakpoint, do so. */ | |
99619bea | 3044 | tp->stepping_over_breakpoint = 1; |
c906108c SS |
3045 | } |
3046 | else | |
3047 | { | |
515630c5 | 3048 | regcache_write_pc (regcache, addr); |
c906108c SS |
3049 | } |
3050 | ||
70509625 PA |
3051 | if (siggnal != GDB_SIGNAL_DEFAULT) |
3052 | tp->suspend.stop_signal = siggnal; | |
3053 | ||
4d9d9d04 PA |
3054 | resume_ptid = user_visible_resume_ptid (tp->control.stepping_command); |
3055 | ||
3056 | /* If an exception is thrown from this point on, make sure to | |
3057 | propagate GDB's knowledge of the executing state to the | |
3058 | frontend/user running state. */ | |
3059 | old_chain = make_cleanup (finish_thread_state_cleanup, &resume_ptid); | |
3060 | ||
3061 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3062 | threads (e.g., we might need to set threads stepping over | |
3063 | breakpoints first), from the user/frontend's point of view, all | |
3064 | threads in RESUME_PTID are now running. Unless we're calling an | |
3065 | inferior function, as in that case we pretend the inferior | |
3066 | doesn't run at all. */ | |
3067 | if (!tp->control.in_infcall) | |
3068 | set_running (resume_ptid, 1); | |
17b2616c | 3069 | |
527159b7 | 3070 | if (debug_infrun) |
8a9de0e4 | 3071 | fprintf_unfiltered (gdb_stdlog, |
64ce06e4 | 3072 | "infrun: proceed (addr=%s, signal=%s)\n", |
c9737c08 | 3073 | paddress (gdbarch, addr), |
64ce06e4 | 3074 | gdb_signal_to_symbol_string (siggnal)); |
527159b7 | 3075 | |
4d9d9d04 PA |
3076 | annotate_starting (); |
3077 | ||
3078 | /* Make sure that output from GDB appears before output from the | |
3079 | inferior. */ | |
3080 | gdb_flush (gdb_stdout); | |
3081 | ||
3082 | /* In a multi-threaded task we may select another thread and | |
3083 | then continue or step. | |
3084 | ||
3085 | But if a thread that we're resuming had stopped at a breakpoint, | |
3086 | it will immediately cause another breakpoint stop without any | |
3087 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3088 | we must step over it first. | |
3089 | ||
3090 | Look for threads other than the current (TP) that reported a | |
3091 | breakpoint hit and haven't been resumed yet since. */ | |
3092 | ||
3093 | /* If scheduler locking applies, we can avoid iterating over all | |
3094 | threads. */ | |
3095 | if (!non_stop && !schedlock_applies (tp)) | |
94cc34af | 3096 | { |
4d9d9d04 PA |
3097 | struct thread_info *current = tp; |
3098 | ||
3099 | ALL_NON_EXITED_THREADS (tp) | |
3100 | { | |
3101 | /* Ignore the current thread here. It's handled | |
3102 | afterwards. */ | |
3103 | if (tp == current) | |
3104 | continue; | |
99619bea | 3105 | |
4d9d9d04 PA |
3106 | /* Ignore threads of processes we're not resuming. */ |
3107 | if (!ptid_match (tp->ptid, resume_ptid)) | |
3108 | continue; | |
c906108c | 3109 | |
4d9d9d04 PA |
3110 | if (!thread_still_needs_step_over (tp)) |
3111 | continue; | |
3112 | ||
3113 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3114 | |
99619bea PA |
3115 | if (debug_infrun) |
3116 | fprintf_unfiltered (gdb_stdlog, | |
3117 | "infrun: need to step-over [%s] first\n", | |
4d9d9d04 | 3118 | target_pid_to_str (tp->ptid)); |
99619bea | 3119 | |
4d9d9d04 | 3120 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3121 | } |
31e77af2 | 3122 | |
4d9d9d04 | 3123 | tp = current; |
30852783 UW |
3124 | } |
3125 | ||
4d9d9d04 PA |
3126 | /* Enqueue the current thread last, so that we move all other |
3127 | threads over their breakpoints first. */ | |
3128 | if (tp->stepping_over_breakpoint) | |
3129 | thread_step_over_chain_enqueue (tp); | |
30852783 | 3130 | |
4d9d9d04 PA |
3131 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3132 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3133 | advanced. Must do this before resuming any thread, as in | |
3134 | all-stop/remote, once we resume we can't send any other packet | |
3135 | until the target stops again. */ | |
3136 | tp->prev_pc = regcache_read_pc (regcache); | |
99619bea | 3137 | |
85ad3aaf PA |
3138 | defer_resume_cleanup = make_cleanup_defer_target_commit_resume (); |
3139 | ||
4d9d9d04 | 3140 | started = start_step_over (); |
c906108c | 3141 | |
4d9d9d04 PA |
3142 | if (step_over_info_valid_p ()) |
3143 | { | |
3144 | /* Either this thread started a new in-line step over, or some | |
3145 | other thread was already doing one. In either case, don't | |
3146 | resume anything else until the step-over is finished. */ | |
3147 | } | |
fbea99ea | 3148 | else if (started && !target_is_non_stop_p ()) |
4d9d9d04 PA |
3149 | { |
3150 | /* A new displaced stepping sequence was started. In all-stop, | |
3151 | we can't talk to the target anymore until it next stops. */ | |
3152 | } | |
fbea99ea PA |
3153 | else if (!non_stop && target_is_non_stop_p ()) |
3154 | { | |
3155 | /* In all-stop, but the target is always in non-stop mode. | |
3156 | Start all other threads that are implicitly resumed too. */ | |
3157 | ALL_NON_EXITED_THREADS (tp) | |
3158 | { | |
3159 | /* Ignore threads of processes we're not resuming. */ | |
3160 | if (!ptid_match (tp->ptid, resume_ptid)) | |
3161 | continue; | |
3162 | ||
3163 | if (tp->resumed) | |
3164 | { | |
3165 | if (debug_infrun) | |
3166 | fprintf_unfiltered (gdb_stdlog, | |
3167 | "infrun: proceed: [%s] resumed\n", | |
3168 | target_pid_to_str (tp->ptid)); | |
3169 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
3170 | continue; | |
3171 | } | |
3172 | ||
3173 | if (thread_is_in_step_over_chain (tp)) | |
3174 | { | |
3175 | if (debug_infrun) | |
3176 | fprintf_unfiltered (gdb_stdlog, | |
3177 | "infrun: proceed: [%s] needs step-over\n", | |
3178 | target_pid_to_str (tp->ptid)); | |
3179 | continue; | |
3180 | } | |
3181 | ||
3182 | if (debug_infrun) | |
3183 | fprintf_unfiltered (gdb_stdlog, | |
3184 | "infrun: proceed: resuming %s\n", | |
3185 | target_pid_to_str (tp->ptid)); | |
3186 | ||
3187 | reset_ecs (ecs, tp); | |
3188 | switch_to_thread (tp->ptid); | |
3189 | keep_going_pass_signal (ecs); | |
3190 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3191 | error (_("Command aborted.")); |
fbea99ea PA |
3192 | } |
3193 | } | |
372316f1 | 3194 | else if (!tp->resumed && !thread_is_in_step_over_chain (tp)) |
4d9d9d04 PA |
3195 | { |
3196 | /* The thread wasn't started, and isn't queued, run it now. */ | |
3197 | reset_ecs (ecs, tp); | |
3198 | switch_to_thread (tp->ptid); | |
3199 | keep_going_pass_signal (ecs); | |
3200 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3201 | error (_("Command aborted.")); |
4d9d9d04 | 3202 | } |
c906108c | 3203 | |
85ad3aaf PA |
3204 | do_cleanups (defer_resume_cleanup); |
3205 | target_commit_resume (); | |
3206 | ||
4d9d9d04 | 3207 | discard_cleanups (old_chain); |
c906108c | 3208 | |
0b333c5e PA |
3209 | /* Tell the event loop to wait for it to stop. If the target |
3210 | supports asynchronous execution, it'll do this from within | |
3211 | target_resume. */ | |
362646f5 | 3212 | if (!target_can_async_p ()) |
0b333c5e | 3213 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3214 | } |
c906108c SS |
3215 | \f |
3216 | ||
3217 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3218 | |
c906108c | 3219 | void |
8621d6a9 | 3220 | start_remote (int from_tty) |
c906108c | 3221 | { |
d6b48e9c | 3222 | struct inferior *inferior; |
d6b48e9c PA |
3223 | |
3224 | inferior = current_inferior (); | |
16c381f0 | 3225 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; |
43ff13b4 | 3226 | |
1777feb0 | 3227 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3228 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3229 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3230 | nothing is returned (instead of just blocking). Because of this, |
3231 | targets expecting an immediate response need to, internally, set | |
3232 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3233 | timeout. */ |
6426a772 JM |
3234 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3235 | differentiate to its caller what the state of the target is after | |
3236 | the initial open has been performed. Here we're assuming that | |
3237 | the target has stopped. It should be possible to eventually have | |
3238 | target_open() return to the caller an indication that the target | |
3239 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3240 | for an async run. */ |
e4c8541f | 3241 | wait_for_inferior (); |
8621d6a9 DJ |
3242 | |
3243 | /* Now that the inferior has stopped, do any bookkeeping like | |
3244 | loading shared libraries. We want to do this before normal_stop, | |
3245 | so that the displayed frame is up to date. */ | |
3246 | post_create_inferior (¤t_target, from_tty); | |
3247 | ||
6426a772 | 3248 | normal_stop (); |
c906108c SS |
3249 | } |
3250 | ||
3251 | /* Initialize static vars when a new inferior begins. */ | |
3252 | ||
3253 | void | |
96baa820 | 3254 | init_wait_for_inferior (void) |
c906108c SS |
3255 | { |
3256 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3257 | |
c906108c SS |
3258 | breakpoint_init_inferior (inf_starting); |
3259 | ||
70509625 | 3260 | clear_proceed_status (0); |
9f976b41 | 3261 | |
ca005067 | 3262 | target_last_wait_ptid = minus_one_ptid; |
237fc4c9 | 3263 | |
842951eb | 3264 | previous_inferior_ptid = inferior_ptid; |
0d1e5fa7 | 3265 | |
edb3359d DJ |
3266 | /* Discard any skipped inlined frames. */ |
3267 | clear_inline_frame_state (minus_one_ptid); | |
c906108c | 3268 | } |
237fc4c9 | 3269 | |
c906108c | 3270 | \f |
488f131b | 3271 | |
ec9499be | 3272 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3273 | |
568d6575 UW |
3274 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3275 | struct execution_control_state *ecs); | |
3276 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3277 | struct execution_control_state *ecs); | |
4f5d7f63 | 3278 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3279 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3280 | struct frame_info *); |
611c83ae | 3281 | |
bdc36728 | 3282 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3283 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3284 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3285 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3286 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3287 | |
252fbfc8 PA |
3288 | /* This function is attached as a "thread_stop_requested" observer. |
3289 | Cleanup local state that assumed the PTID was to be resumed, and | |
3290 | report the stop to the frontend. */ | |
3291 | ||
2c0b251b | 3292 | static void |
252fbfc8 PA |
3293 | infrun_thread_stop_requested (ptid_t ptid) |
3294 | { | |
c2829269 | 3295 | struct thread_info *tp; |
252fbfc8 | 3296 | |
c65d6b55 PA |
3297 | /* PTID was requested to stop. If the thread was already stopped, |
3298 | but the user/frontend doesn't know about that yet (e.g., the | |
3299 | thread had been temporarily paused for some step-over), set up | |
3300 | for reporting the stop now. */ | |
c2829269 PA |
3301 | ALL_NON_EXITED_THREADS (tp) |
3302 | if (ptid_match (tp->ptid, ptid)) | |
3303 | { | |
c65d6b55 PA |
3304 | if (tp->state != THREAD_RUNNING) |
3305 | continue; | |
3306 | if (tp->executing) | |
3307 | continue; | |
3308 | ||
3309 | /* Remove matching threads from the step-over queue, so | |
3310 | start_step_over doesn't try to resume them | |
3311 | automatically. */ | |
c2829269 PA |
3312 | if (thread_is_in_step_over_chain (tp)) |
3313 | thread_step_over_chain_remove (tp); | |
252fbfc8 | 3314 | |
c65d6b55 PA |
3315 | /* If the thread is stopped, but the user/frontend doesn't |
3316 | know about that yet, queue a pending event, as if the | |
3317 | thread had just stopped now. Unless the thread already had | |
3318 | a pending event. */ | |
3319 | if (!tp->suspend.waitstatus_pending_p) | |
3320 | { | |
3321 | tp->suspend.waitstatus_pending_p = 1; | |
3322 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3323 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3324 | } | |
3325 | ||
3326 | /* Clear the inline-frame state, since we're re-processing the | |
3327 | stop. */ | |
3328 | clear_inline_frame_state (tp->ptid); | |
3329 | ||
3330 | /* If this thread was paused because some other thread was | |
3331 | doing an inline-step over, let that finish first. Once | |
3332 | that happens, we'll restart all threads and consume pending | |
3333 | stop events then. */ | |
3334 | if (step_over_info_valid_p ()) | |
3335 | continue; | |
3336 | ||
3337 | /* Otherwise we can process the (new) pending event now. Set | |
3338 | it so this pending event is considered by | |
3339 | do_target_wait. */ | |
3340 | tp->resumed = 1; | |
3341 | } | |
252fbfc8 PA |
3342 | } |
3343 | ||
a07daef3 PA |
3344 | static void |
3345 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3346 | { | |
3347 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
3348 | nullify_last_target_wait_ptid (); | |
3349 | } | |
3350 | ||
0cbcdb96 PA |
3351 | /* Delete the step resume, single-step and longjmp/exception resume |
3352 | breakpoints of TP. */ | |
4e1c45ea | 3353 | |
0cbcdb96 PA |
3354 | static void |
3355 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3356 | { |
0cbcdb96 PA |
3357 | delete_step_resume_breakpoint (tp); |
3358 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3359 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3360 | } |
3361 | ||
0cbcdb96 PA |
3362 | /* If the target still has execution, call FUNC for each thread that |
3363 | just stopped. In all-stop, that's all the non-exited threads; in | |
3364 | non-stop, that's the current thread, only. */ | |
3365 | ||
3366 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3367 | (struct thread_info *tp); | |
4e1c45ea PA |
3368 | |
3369 | static void | |
0cbcdb96 | 3370 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3371 | { |
0cbcdb96 | 3372 | if (!target_has_execution || ptid_equal (inferior_ptid, null_ptid)) |
4e1c45ea PA |
3373 | return; |
3374 | ||
fbea99ea | 3375 | if (target_is_non_stop_p ()) |
4e1c45ea | 3376 | { |
0cbcdb96 PA |
3377 | /* If in non-stop mode, only the current thread stopped. */ |
3378 | func (inferior_thread ()); | |
4e1c45ea PA |
3379 | } |
3380 | else | |
0cbcdb96 PA |
3381 | { |
3382 | struct thread_info *tp; | |
3383 | ||
3384 | /* In all-stop mode, all threads have stopped. */ | |
3385 | ALL_NON_EXITED_THREADS (tp) | |
3386 | { | |
3387 | func (tp); | |
3388 | } | |
3389 | } | |
3390 | } | |
3391 | ||
3392 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3393 | the threads that just stopped. */ | |
3394 | ||
3395 | static void | |
3396 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3397 | { | |
3398 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3399 | } |
3400 | ||
3401 | /* Delete the single-step breakpoints of the threads that just | |
3402 | stopped. */ | |
7c16b83e | 3403 | |
34b7e8a6 PA |
3404 | static void |
3405 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3406 | { | |
3407 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3408 | } |
3409 | ||
1777feb0 | 3410 | /* A cleanup wrapper. */ |
4e1c45ea PA |
3411 | |
3412 | static void | |
0cbcdb96 | 3413 | delete_just_stopped_threads_infrun_breakpoints_cleanup (void *arg) |
4e1c45ea | 3414 | { |
0cbcdb96 | 3415 | delete_just_stopped_threads_infrun_breakpoints (); |
4e1c45ea PA |
3416 | } |
3417 | ||
221e1a37 | 3418 | /* See infrun.h. */ |
223698f8 | 3419 | |
221e1a37 | 3420 | void |
223698f8 DE |
3421 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3422 | const struct target_waitstatus *ws) | |
3423 | { | |
3424 | char *status_string = target_waitstatus_to_string (ws); | |
d7e74731 | 3425 | string_file stb; |
223698f8 DE |
3426 | |
3427 | /* The text is split over several lines because it was getting too long. | |
3428 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3429 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3430 | is set. */ | |
3431 | ||
d7e74731 PA |
3432 | stb.printf ("infrun: target_wait (%d.%ld.%ld", |
3433 | ptid_get_pid (waiton_ptid), | |
3434 | ptid_get_lwp (waiton_ptid), | |
3435 | ptid_get_tid (waiton_ptid)); | |
dfd4cc63 | 3436 | if (ptid_get_pid (waiton_ptid) != -1) |
d7e74731 PA |
3437 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid)); |
3438 | stb.printf (", status) =\n"); | |
3439 | stb.printf ("infrun: %d.%ld.%ld [%s],\n", | |
3440 | ptid_get_pid (result_ptid), | |
3441 | ptid_get_lwp (result_ptid), | |
3442 | ptid_get_tid (result_ptid), | |
3443 | target_pid_to_str (result_ptid)); | |
3444 | stb.printf ("infrun: %s\n", status_string); | |
223698f8 DE |
3445 | |
3446 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3447 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3448 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3449 | |
3450 | xfree (status_string); | |
223698f8 DE |
3451 | } |
3452 | ||
372316f1 PA |
3453 | /* Select a thread at random, out of those which are resumed and have |
3454 | had events. */ | |
3455 | ||
3456 | static struct thread_info * | |
3457 | random_pending_event_thread (ptid_t waiton_ptid) | |
3458 | { | |
3459 | struct thread_info *event_tp; | |
3460 | int num_events = 0; | |
3461 | int random_selector; | |
3462 | ||
3463 | /* First see how many events we have. Count only resumed threads | |
3464 | that have an event pending. */ | |
3465 | ALL_NON_EXITED_THREADS (event_tp) | |
3466 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3467 | && event_tp->resumed | |
3468 | && event_tp->suspend.waitstatus_pending_p) | |
3469 | num_events++; | |
3470 | ||
3471 | if (num_events == 0) | |
3472 | return NULL; | |
3473 | ||
3474 | /* Now randomly pick a thread out of those that have had events. */ | |
3475 | random_selector = (int) | |
3476 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
3477 | ||
3478 | if (debug_infrun && num_events > 1) | |
3479 | fprintf_unfiltered (gdb_stdlog, | |
3480 | "infrun: Found %d events, selecting #%d\n", | |
3481 | num_events, random_selector); | |
3482 | ||
3483 | /* Select the Nth thread that has had an event. */ | |
3484 | ALL_NON_EXITED_THREADS (event_tp) | |
3485 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3486 | && event_tp->resumed | |
3487 | && event_tp->suspend.waitstatus_pending_p) | |
3488 | if (random_selector-- == 0) | |
3489 | break; | |
3490 | ||
3491 | return event_tp; | |
3492 | } | |
3493 | ||
3494 | /* Wrapper for target_wait that first checks whether threads have | |
3495 | pending statuses to report before actually asking the target for | |
3496 | more events. */ | |
3497 | ||
3498 | static ptid_t | |
3499 | do_target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
3500 | { | |
3501 | ptid_t event_ptid; | |
3502 | struct thread_info *tp; | |
3503 | ||
3504 | /* First check if there is a resumed thread with a wait status | |
3505 | pending. */ | |
3506 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) | |
3507 | { | |
3508 | tp = random_pending_event_thread (ptid); | |
3509 | } | |
3510 | else | |
3511 | { | |
3512 | if (debug_infrun) | |
3513 | fprintf_unfiltered (gdb_stdlog, | |
3514 | "infrun: Waiting for specific thread %s.\n", | |
3515 | target_pid_to_str (ptid)); | |
3516 | ||
3517 | /* We have a specific thread to check. */ | |
3518 | tp = find_thread_ptid (ptid); | |
3519 | gdb_assert (tp != NULL); | |
3520 | if (!tp->suspend.waitstatus_pending_p) | |
3521 | tp = NULL; | |
3522 | } | |
3523 | ||
3524 | if (tp != NULL | |
3525 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3526 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3527 | { | |
3528 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
3529 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3530 | CORE_ADDR pc; | |
3531 | int discard = 0; | |
3532 | ||
3533 | pc = regcache_read_pc (regcache); | |
3534 | ||
3535 | if (pc != tp->suspend.stop_pc) | |
3536 | { | |
3537 | if (debug_infrun) | |
3538 | fprintf_unfiltered (gdb_stdlog, | |
3539 | "infrun: PC of %s changed. was=%s, now=%s\n", | |
3540 | target_pid_to_str (tp->ptid), | |
3541 | paddress (gdbarch, tp->prev_pc), | |
3542 | paddress (gdbarch, pc)); | |
3543 | discard = 1; | |
3544 | } | |
3545 | else if (!breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3546 | { | |
3547 | if (debug_infrun) | |
3548 | fprintf_unfiltered (gdb_stdlog, | |
3549 | "infrun: previous breakpoint of %s, at %s gone\n", | |
3550 | target_pid_to_str (tp->ptid), | |
3551 | paddress (gdbarch, pc)); | |
3552 | ||
3553 | discard = 1; | |
3554 | } | |
3555 | ||
3556 | if (discard) | |
3557 | { | |
3558 | if (debug_infrun) | |
3559 | fprintf_unfiltered (gdb_stdlog, | |
3560 | "infrun: pending event of %s cancelled.\n", | |
3561 | target_pid_to_str (tp->ptid)); | |
3562 | ||
3563 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3564 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3565 | } | |
3566 | } | |
3567 | ||
3568 | if (tp != NULL) | |
3569 | { | |
3570 | if (debug_infrun) | |
3571 | { | |
3572 | char *statstr; | |
3573 | ||
3574 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
3575 | fprintf_unfiltered (gdb_stdlog, | |
3576 | "infrun: Using pending wait status %s for %s.\n", | |
3577 | statstr, | |
3578 | target_pid_to_str (tp->ptid)); | |
3579 | xfree (statstr); | |
3580 | } | |
3581 | ||
3582 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3583 | if it was a software breakpoint (and the target doesn't | |
3584 | always adjust the PC itself). */ | |
3585 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3586 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3587 | { | |
3588 | struct regcache *regcache; | |
3589 | struct gdbarch *gdbarch; | |
3590 | int decr_pc; | |
3591 | ||
3592 | regcache = get_thread_regcache (tp->ptid); | |
3593 | gdbarch = get_regcache_arch (regcache); | |
3594 | ||
3595 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3596 | if (decr_pc != 0) | |
3597 | { | |
3598 | CORE_ADDR pc; | |
3599 | ||
3600 | pc = regcache_read_pc (regcache); | |
3601 | regcache_write_pc (regcache, pc + decr_pc); | |
3602 | } | |
3603 | } | |
3604 | ||
3605 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3606 | *status = tp->suspend.waitstatus; | |
3607 | tp->suspend.waitstatus_pending_p = 0; | |
3608 | ||
3609 | /* Wake up the event loop again, until all pending events are | |
3610 | processed. */ | |
3611 | if (target_is_async_p ()) | |
3612 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3613 | return tp->ptid; | |
3614 | } | |
3615 | ||
3616 | /* But if we don't find one, we'll have to wait. */ | |
3617 | ||
3618 | if (deprecated_target_wait_hook) | |
3619 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3620 | else | |
3621 | event_ptid = target_wait (ptid, status, options); | |
3622 | ||
3623 | return event_ptid; | |
3624 | } | |
3625 | ||
24291992 PA |
3626 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3627 | detaching while a thread is displaced stepping is a recipe for | |
3628 | crashing it, as nothing would readjust the PC out of the scratch | |
3629 | pad. */ | |
3630 | ||
3631 | void | |
3632 | prepare_for_detach (void) | |
3633 | { | |
3634 | struct inferior *inf = current_inferior (); | |
3635 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
24291992 PA |
3636 | struct displaced_step_inferior_state *displaced; |
3637 | ||
3638 | displaced = get_displaced_stepping_state (inf->pid); | |
3639 | ||
3640 | /* Is any thread of this process displaced stepping? If not, | |
3641 | there's nothing else to do. */ | |
3642 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
3643 | return; | |
3644 | ||
3645 | if (debug_infrun) | |
3646 | fprintf_unfiltered (gdb_stdlog, | |
3647 | "displaced-stepping in-process while detaching"); | |
3648 | ||
9bcb1f16 | 3649 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 PA |
3650 | |
3651 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
3652 | { | |
3653 | struct cleanup *old_chain_2; | |
3654 | struct execution_control_state ecss; | |
3655 | struct execution_control_state *ecs; | |
3656 | ||
3657 | ecs = &ecss; | |
3658 | memset (ecs, 0, sizeof (*ecs)); | |
3659 | ||
3660 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3661 | /* Flush target cache before starting to handle each event. |
3662 | Target was running and cache could be stale. This is just a | |
3663 | heuristic. Running threads may modify target memory, but we | |
3664 | don't get any event. */ | |
3665 | target_dcache_invalidate (); | |
24291992 | 3666 | |
372316f1 | 3667 | ecs->ptid = do_target_wait (pid_ptid, &ecs->ws, 0); |
24291992 PA |
3668 | |
3669 | if (debug_infrun) | |
3670 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3671 | ||
3672 | /* If an error happens while handling the event, propagate GDB's | |
3673 | knowledge of the executing state to the frontend/user running | |
3674 | state. */ | |
3e43a32a MS |
3675 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, |
3676 | &minus_one_ptid); | |
24291992 PA |
3677 | |
3678 | /* Now figure out what to do with the result of the result. */ | |
3679 | handle_inferior_event (ecs); | |
3680 | ||
3681 | /* No error, don't finish the state yet. */ | |
3682 | discard_cleanups (old_chain_2); | |
3683 | ||
3684 | /* Breakpoints and watchpoints are not installed on the target | |
3685 | at this point, and signals are passed directly to the | |
3686 | inferior, so this must mean the process is gone. */ | |
3687 | if (!ecs->wait_some_more) | |
3688 | { | |
9bcb1f16 | 3689 | restore_detaching.release (); |
24291992 PA |
3690 | error (_("Program exited while detaching")); |
3691 | } | |
3692 | } | |
3693 | ||
9bcb1f16 | 3694 | restore_detaching.release (); |
24291992 PA |
3695 | } |
3696 | ||
cd0fc7c3 | 3697 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3698 | |
cd0fc7c3 SS |
3699 | If inferior gets a signal, we may decide to start it up again |
3700 | instead of returning. That is why there is a loop in this function. | |
3701 | When this function actually returns it means the inferior | |
3702 | should be left stopped and GDB should read more commands. */ | |
3703 | ||
3704 | void | |
e4c8541f | 3705 | wait_for_inferior (void) |
cd0fc7c3 SS |
3706 | { |
3707 | struct cleanup *old_cleanups; | |
e6f5c25b | 3708 | struct cleanup *thread_state_chain; |
c906108c | 3709 | |
527159b7 | 3710 | if (debug_infrun) |
ae123ec6 | 3711 | fprintf_unfiltered |
e4c8541f | 3712 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3713 | |
0cbcdb96 PA |
3714 | old_cleanups |
3715 | = make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, | |
3716 | NULL); | |
cd0fc7c3 | 3717 | |
e6f5c25b PA |
3718 | /* If an error happens while handling the event, propagate GDB's |
3719 | knowledge of the executing state to the frontend/user running | |
3720 | state. */ | |
3721 | thread_state_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
3722 | ||
c906108c SS |
3723 | while (1) |
3724 | { | |
ae25568b PA |
3725 | struct execution_control_state ecss; |
3726 | struct execution_control_state *ecs = &ecss; | |
963f9c80 | 3727 | ptid_t waiton_ptid = minus_one_ptid; |
29f49a6a | 3728 | |
ae25568b PA |
3729 | memset (ecs, 0, sizeof (*ecs)); |
3730 | ||
ec9499be | 3731 | overlay_cache_invalid = 1; |
ec9499be | 3732 | |
f15cb84a YQ |
3733 | /* Flush target cache before starting to handle each event. |
3734 | Target was running and cache could be stale. This is just a | |
3735 | heuristic. Running threads may modify target memory, but we | |
3736 | don't get any event. */ | |
3737 | target_dcache_invalidate (); | |
3738 | ||
372316f1 | 3739 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 3740 | |
f00150c9 | 3741 | if (debug_infrun) |
223698f8 | 3742 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3743 | |
cd0fc7c3 SS |
3744 | /* Now figure out what to do with the result of the result. */ |
3745 | handle_inferior_event (ecs); | |
c906108c | 3746 | |
cd0fc7c3 SS |
3747 | if (!ecs->wait_some_more) |
3748 | break; | |
3749 | } | |
4e1c45ea | 3750 | |
e6f5c25b PA |
3751 | /* No error, don't finish the state yet. */ |
3752 | discard_cleanups (thread_state_chain); | |
3753 | ||
cd0fc7c3 SS |
3754 | do_cleanups (old_cleanups); |
3755 | } | |
c906108c | 3756 | |
d3d4baed PA |
3757 | /* Cleanup that reinstalls the readline callback handler, if the |
3758 | target is running in the background. If while handling the target | |
3759 | event something triggered a secondary prompt, like e.g., a | |
3760 | pagination prompt, we'll have removed the callback handler (see | |
3761 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3762 | event loop, ready to process further input. Note this has no | |
3763 | effect if the handler hasn't actually been removed, because calling | |
3764 | rl_callback_handler_install resets the line buffer, thus losing | |
3765 | input. */ | |
3766 | ||
3767 | static void | |
3768 | reinstall_readline_callback_handler_cleanup (void *arg) | |
3769 | { | |
3b12939d PA |
3770 | struct ui *ui = current_ui; |
3771 | ||
3772 | if (!ui->async) | |
6c400b59 PA |
3773 | { |
3774 | /* We're not going back to the top level event loop yet. Don't | |
3775 | install the readline callback, as it'd prep the terminal, | |
3776 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3777 | it the next time the prompt is displayed, when we're ready | |
3778 | for input. */ | |
3779 | return; | |
3780 | } | |
3781 | ||
3b12939d | 3782 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3783 | gdb_rl_callback_handler_reinstall (); |
3784 | } | |
3785 | ||
243a9253 PA |
3786 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3787 | that's just the event thread. In all-stop, that's all threads. */ | |
3788 | ||
3789 | static void | |
3790 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3791 | { | |
3792 | struct thread_info *thr = ecs->event_thread; | |
3793 | ||
3794 | if (thr != NULL && thr->thread_fsm != NULL) | |
8980e177 | 3795 | thread_fsm_clean_up (thr->thread_fsm, thr); |
243a9253 PA |
3796 | |
3797 | if (!non_stop) | |
3798 | { | |
3799 | ALL_NON_EXITED_THREADS (thr) | |
3800 | { | |
3801 | if (thr->thread_fsm == NULL) | |
3802 | continue; | |
3803 | if (thr == ecs->event_thread) | |
3804 | continue; | |
3805 | ||
3806 | switch_to_thread (thr->ptid); | |
8980e177 | 3807 | thread_fsm_clean_up (thr->thread_fsm, thr); |
243a9253 PA |
3808 | } |
3809 | ||
3810 | if (ecs->event_thread != NULL) | |
3811 | switch_to_thread (ecs->event_thread->ptid); | |
3812 | } | |
3813 | } | |
3814 | ||
3b12939d PA |
3815 | /* Helper for all_uis_check_sync_execution_done that works on the |
3816 | current UI. */ | |
3817 | ||
3818 | static void | |
3819 | check_curr_ui_sync_execution_done (void) | |
3820 | { | |
3821 | struct ui *ui = current_ui; | |
3822 | ||
3823 | if (ui->prompt_state == PROMPT_NEEDED | |
3824 | && ui->async | |
3825 | && !gdb_in_secondary_prompt_p (ui)) | |
3826 | { | |
3827 | target_terminal_ours (); | |
3828 | observer_notify_sync_execution_done (); | |
3eb7562a | 3829 | ui_register_input_event_handler (ui); |
3b12939d PA |
3830 | } |
3831 | } | |
3832 | ||
3833 | /* See infrun.h. */ | |
3834 | ||
3835 | void | |
3836 | all_uis_check_sync_execution_done (void) | |
3837 | { | |
0e454242 | 3838 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3839 | { |
3840 | check_curr_ui_sync_execution_done (); | |
3841 | } | |
3842 | } | |
3843 | ||
a8836c93 PA |
3844 | /* See infrun.h. */ |
3845 | ||
3846 | void | |
3847 | all_uis_on_sync_execution_starting (void) | |
3848 | { | |
0e454242 | 3849 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3850 | { |
3851 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3852 | async_disable_stdin (); | |
3853 | } | |
3854 | } | |
3855 | ||
1777feb0 | 3856 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3857 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3858 | descriptor corresponding to the target. It can be called more than |
3859 | once to complete a single execution command. In such cases we need | |
3860 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3861 | that this function is called for a single execution command, then |
3862 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3863 | necessary cleanups. */ |
43ff13b4 JM |
3864 | |
3865 | void | |
fba45db2 | 3866 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3867 | { |
0d1e5fa7 | 3868 | struct execution_control_state ecss; |
a474d7c2 | 3869 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 3870 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 3871 | struct cleanup *ts_old_chain; |
0f641c01 | 3872 | int cmd_done = 0; |
963f9c80 | 3873 | ptid_t waiton_ptid = minus_one_ptid; |
43ff13b4 | 3874 | |
0d1e5fa7 PA |
3875 | memset (ecs, 0, sizeof (*ecs)); |
3876 | ||
c61db772 PA |
3877 | /* Events are always processed with the main UI as current UI. This |
3878 | way, warnings, debug output, etc. are always consistently sent to | |
3879 | the main console. */ | |
4b6749b9 | 3880 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3881 | |
d3d4baed PA |
3882 | /* End up with readline processing input, if necessary. */ |
3883 | make_cleanup (reinstall_readline_callback_handler_cleanup, NULL); | |
3884 | ||
c5187ac6 PA |
3885 | /* We're handling a live event, so make sure we're doing live |
3886 | debugging. If we're looking at traceframes while the target is | |
3887 | running, we're going to need to get back to that mode after | |
3888 | handling the event. */ | |
3889 | if (non_stop) | |
3890 | { | |
3891 | make_cleanup_restore_current_traceframe (); | |
e6e4e701 | 3892 | set_current_traceframe (-1); |
c5187ac6 PA |
3893 | } |
3894 | ||
5ed8105e PA |
3895 | gdb::optional<scoped_restore_current_thread> maybe_restore_thread; |
3896 | ||
4f8d22e3 PA |
3897 | if (non_stop) |
3898 | /* In non-stop mode, the user/frontend should not notice a thread | |
3899 | switch due to internal events. Make sure we reverse to the | |
3900 | user selected thread and frame after handling the event and | |
3901 | running any breakpoint commands. */ | |
5ed8105e | 3902 | maybe_restore_thread.emplace (); |
4f8d22e3 | 3903 | |
ec9499be | 3904 | overlay_cache_invalid = 1; |
f15cb84a YQ |
3905 | /* Flush target cache before starting to handle each event. Target |
3906 | was running and cache could be stale. This is just a heuristic. | |
3907 | Running threads may modify target memory, but we don't get any | |
3908 | event. */ | |
3909 | target_dcache_invalidate (); | |
3dd5b83d | 3910 | |
b7b633e9 TT |
3911 | scoped_restore save_exec_dir |
3912 | = make_scoped_restore (&execution_direction, target_execution_direction ()); | |
32231432 | 3913 | |
0b333c5e PA |
3914 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, |
3915 | target_can_async_p () ? TARGET_WNOHANG : 0); | |
43ff13b4 | 3916 | |
f00150c9 | 3917 | if (debug_infrun) |
223698f8 | 3918 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3919 | |
29f49a6a PA |
3920 | /* If an error happens while handling the event, propagate GDB's |
3921 | knowledge of the executing state to the frontend/user running | |
3922 | state. */ | |
fbea99ea | 3923 | if (!target_is_non_stop_p ()) |
29f49a6a PA |
3924 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); |
3925 | else | |
3926 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
3927 | ||
353d1d73 JK |
3928 | /* Get executed before make_cleanup_restore_current_thread above to apply |
3929 | still for the thread which has thrown the exception. */ | |
3930 | make_bpstat_clear_actions_cleanup (); | |
3931 | ||
7c16b83e PA |
3932 | make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, NULL); |
3933 | ||
43ff13b4 | 3934 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 3935 | handle_inferior_event (ecs); |
43ff13b4 | 3936 | |
a474d7c2 | 3937 | if (!ecs->wait_some_more) |
43ff13b4 | 3938 | { |
c9657e70 | 3939 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
243a9253 PA |
3940 | int should_stop = 1; |
3941 | struct thread_info *thr = ecs->event_thread; | |
388a7084 | 3942 | int should_notify_stop = 1; |
d6b48e9c | 3943 | |
0cbcdb96 | 3944 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3945 | |
243a9253 PA |
3946 | if (thr != NULL) |
3947 | { | |
3948 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
3949 | ||
3950 | if (thread_fsm != NULL) | |
8980e177 | 3951 | should_stop = thread_fsm_should_stop (thread_fsm, thr); |
243a9253 PA |
3952 | } |
3953 | ||
3954 | if (!should_stop) | |
3955 | { | |
3956 | keep_going (ecs); | |
3957 | } | |
c2d11a7d | 3958 | else |
0f641c01 | 3959 | { |
243a9253 PA |
3960 | clean_up_just_stopped_threads_fsms (ecs); |
3961 | ||
388a7084 PA |
3962 | if (thr != NULL && thr->thread_fsm != NULL) |
3963 | { | |
3964 | should_notify_stop | |
3965 | = thread_fsm_should_notify_stop (thr->thread_fsm); | |
3966 | } | |
3967 | ||
3968 | if (should_notify_stop) | |
3969 | { | |
4c2f2a79 PA |
3970 | int proceeded = 0; |
3971 | ||
388a7084 PA |
3972 | /* We may not find an inferior if this was a process exit. */ |
3973 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
4c2f2a79 | 3974 | proceeded = normal_stop (); |
243a9253 | 3975 | |
4c2f2a79 PA |
3976 | if (!proceeded) |
3977 | { | |
3978 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
3979 | cmd_done = 1; | |
3980 | } | |
388a7084 | 3981 | } |
0f641c01 | 3982 | } |
43ff13b4 | 3983 | } |
4f8d22e3 | 3984 | |
29f49a6a PA |
3985 | /* No error, don't finish the thread states yet. */ |
3986 | discard_cleanups (ts_old_chain); | |
3987 | ||
4f8d22e3 PA |
3988 | /* Revert thread and frame. */ |
3989 | do_cleanups (old_chain); | |
3990 | ||
3b12939d PA |
3991 | /* If a UI was in sync execution mode, and now isn't, restore its |
3992 | prompt (a synchronous execution command has finished, and we're | |
3993 | ready for input). */ | |
3994 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
3995 | |
3996 | if (cmd_done | |
0f641c01 PA |
3997 | && exec_done_display_p |
3998 | && (ptid_equal (inferior_ptid, null_ptid) | |
3999 | || !is_running (inferior_ptid))) | |
4000 | printf_unfiltered (_("completed.\n")); | |
43ff13b4 JM |
4001 | } |
4002 | ||
edb3359d DJ |
4003 | /* Record the frame and location we're currently stepping through. */ |
4004 | void | |
4005 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
4006 | { | |
4007 | struct thread_info *tp = inferior_thread (); | |
4008 | ||
16c381f0 JK |
4009 | tp->control.step_frame_id = get_frame_id (frame); |
4010 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4011 | |
4012 | tp->current_symtab = sal.symtab; | |
4013 | tp->current_line = sal.line; | |
4014 | } | |
4015 | ||
0d1e5fa7 PA |
4016 | /* Clear context switchable stepping state. */ |
4017 | ||
4018 | void | |
4e1c45ea | 4019 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4020 | { |
7f5ef605 | 4021 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4022 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4023 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4024 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4025 | } |
4026 | ||
c32c64b7 DE |
4027 | /* Set the cached copy of the last ptid/waitstatus. */ |
4028 | ||
6efcd9a8 | 4029 | void |
c32c64b7 DE |
4030 | set_last_target_status (ptid_t ptid, struct target_waitstatus status) |
4031 | { | |
4032 | target_last_wait_ptid = ptid; | |
4033 | target_last_waitstatus = status; | |
4034 | } | |
4035 | ||
e02bc4cc | 4036 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
4037 | target_wait()/deprecated_target_wait_hook(). The data is actually |
4038 | cached by handle_inferior_event(), which gets called immediately | |
4039 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
4040 | |
4041 | void | |
488f131b | 4042 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 4043 | { |
39f77062 | 4044 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
4045 | *status = target_last_waitstatus; |
4046 | } | |
4047 | ||
ac264b3b MS |
4048 | void |
4049 | nullify_last_target_wait_ptid (void) | |
4050 | { | |
4051 | target_last_wait_ptid = minus_one_ptid; | |
4052 | } | |
4053 | ||
dcf4fbde | 4054 | /* Switch thread contexts. */ |
dd80620e MS |
4055 | |
4056 | static void | |
0d1e5fa7 | 4057 | context_switch (ptid_t ptid) |
dd80620e | 4058 | { |
4b51d87b | 4059 | if (debug_infrun && !ptid_equal (ptid, inferior_ptid)) |
fd48f117 DJ |
4060 | { |
4061 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
4062 | target_pid_to_str (inferior_ptid)); | |
4063 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 4064 | target_pid_to_str (ptid)); |
fd48f117 DJ |
4065 | } |
4066 | ||
0d1e5fa7 | 4067 | switch_to_thread (ptid); |
dd80620e MS |
4068 | } |
4069 | ||
d8dd4d5f PA |
4070 | /* If the target can't tell whether we've hit breakpoints |
4071 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4072 | check whether that could have been caused by a breakpoint. If so, | |
4073 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4074 | ||
4fa8626c | 4075 | static void |
d8dd4d5f PA |
4076 | adjust_pc_after_break (struct thread_info *thread, |
4077 | struct target_waitstatus *ws) | |
4fa8626c | 4078 | { |
24a73cce UW |
4079 | struct regcache *regcache; |
4080 | struct gdbarch *gdbarch; | |
6c95b8df | 4081 | struct address_space *aspace; |
118e6252 | 4082 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4083 | |
4fa8626c DJ |
4084 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4085 | we aren't, just return. | |
9709f61c DJ |
4086 | |
4087 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4088 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4089 | implemented by software breakpoints should be handled through the normal | |
4090 | breakpoint layer. | |
8fb3e588 | 4091 | |
4fa8626c DJ |
4092 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4093 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4094 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4095 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4096 | generates these signals at breakpoints (the code has been in GDB since at | |
4097 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4098 | |
e6cf7916 UW |
4099 | In earlier versions of GDB, a target with |
4100 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4101 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4102 | target with both of these set in GDB history, and it seems unlikely to be | |
4103 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4104 | |
d8dd4d5f | 4105 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4106 | return; |
4107 | ||
d8dd4d5f | 4108 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4109 | return; |
4110 | ||
4058b839 PA |
4111 | /* In reverse execution, when a breakpoint is hit, the instruction |
4112 | under it has already been de-executed. The reported PC always | |
4113 | points at the breakpoint address, so adjusting it further would | |
4114 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4115 | architecture: | |
4116 | ||
4117 | B1 0x08000000 : INSN1 | |
4118 | B2 0x08000001 : INSN2 | |
4119 | 0x08000002 : INSN3 | |
4120 | PC -> 0x08000003 : INSN4 | |
4121 | ||
4122 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4123 | from that point should hit B2 as below. Reading the PC when the | |
4124 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4125 | been de-executed already. | |
4126 | ||
4127 | B1 0x08000000 : INSN1 | |
4128 | B2 PC -> 0x08000001 : INSN2 | |
4129 | 0x08000002 : INSN3 | |
4130 | 0x08000003 : INSN4 | |
4131 | ||
4132 | We can't apply the same logic as for forward execution, because | |
4133 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4134 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4135 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4136 | behaviour. */ | |
4137 | if (execution_direction == EXEC_REVERSE) | |
4138 | return; | |
4139 | ||
1cf4d951 PA |
4140 | /* If the target can tell whether the thread hit a SW breakpoint, |
4141 | trust it. Targets that can tell also adjust the PC | |
4142 | themselves. */ | |
4143 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4144 | return; | |
4145 | ||
4146 | /* Note that relying on whether a breakpoint is planted in memory to | |
4147 | determine this can fail. E.g,. the breakpoint could have been | |
4148 | removed since. Or the thread could have been told to step an | |
4149 | instruction the size of a breakpoint instruction, and only | |
4150 | _after_ was a breakpoint inserted at its address. */ | |
4151 | ||
24a73cce UW |
4152 | /* If this target does not decrement the PC after breakpoints, then |
4153 | we have nothing to do. */ | |
d8dd4d5f | 4154 | regcache = get_thread_regcache (thread->ptid); |
24a73cce | 4155 | gdbarch = get_regcache_arch (regcache); |
118e6252 | 4156 | |
527a273a | 4157 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4158 | if (decr_pc == 0) |
24a73cce UW |
4159 | return; |
4160 | ||
6c95b8df PA |
4161 | aspace = get_regcache_aspace (regcache); |
4162 | ||
8aad930b AC |
4163 | /* Find the location where (if we've hit a breakpoint) the |
4164 | breakpoint would be. */ | |
118e6252 | 4165 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4166 | |
1cf4d951 PA |
4167 | /* If the target can't tell whether a software breakpoint triggered, |
4168 | fallback to figuring it out based on breakpoints we think were | |
4169 | inserted in the target, and on whether the thread was stepped or | |
4170 | continued. */ | |
4171 | ||
1c5cfe86 PA |
4172 | /* Check whether there actually is a software breakpoint inserted at |
4173 | that location. | |
4174 | ||
4175 | If in non-stop mode, a race condition is possible where we've | |
4176 | removed a breakpoint, but stop events for that breakpoint were | |
4177 | already queued and arrive later. To suppress those spurious | |
4178 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4179 | and retire them after a number of stop events are reported. Note |
4180 | this is an heuristic and can thus get confused. The real fix is | |
4181 | to get the "stopped by SW BP and needs adjustment" info out of | |
4182 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4183 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4184 | || (target_is_non_stop_p () |
4185 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4186 | { |
77f9e713 | 4187 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); |
abbb1732 | 4188 | |
8213266a | 4189 | if (record_full_is_used ()) |
77f9e713 | 4190 | record_full_gdb_operation_disable_set (); |
96429cc8 | 4191 | |
1c0fdd0e UW |
4192 | /* When using hardware single-step, a SIGTRAP is reported for both |
4193 | a completed single-step and a software breakpoint. Need to | |
4194 | differentiate between the two, as the latter needs adjusting | |
4195 | but the former does not. | |
4196 | ||
4197 | The SIGTRAP can be due to a completed hardware single-step only if | |
4198 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4199 | - this thread is currently being stepped |
4200 | ||
4201 | If any of these events did not occur, we must have stopped due | |
4202 | to hitting a software breakpoint, and have to back up to the | |
4203 | breakpoint address. | |
4204 | ||
4205 | As a special case, we could have hardware single-stepped a | |
4206 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4207 | we also need to back up to the breakpoint address. */ | |
4208 | ||
d8dd4d5f PA |
4209 | if (thread_has_single_step_breakpoints_set (thread) |
4210 | || !currently_stepping (thread) | |
4211 | || (thread->stepped_breakpoint | |
4212 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4213 | regcache_write_pc (regcache, breakpoint_pc); |
96429cc8 | 4214 | |
77f9e713 | 4215 | do_cleanups (old_cleanups); |
8aad930b | 4216 | } |
4fa8626c DJ |
4217 | } |
4218 | ||
edb3359d DJ |
4219 | static int |
4220 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4221 | { | |
4222 | for (frame = get_prev_frame (frame); | |
4223 | frame != NULL; | |
4224 | frame = get_prev_frame (frame)) | |
4225 | { | |
4226 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4227 | return 1; | |
4228 | if (get_frame_type (frame) != INLINE_FRAME) | |
4229 | break; | |
4230 | } | |
4231 | ||
4232 | return 0; | |
4233 | } | |
4234 | ||
c65d6b55 PA |
4235 | /* If the event thread has the stop requested flag set, pretend it |
4236 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4237 | target_stop). */ | |
4238 | ||
4239 | static bool | |
4240 | handle_stop_requested (struct execution_control_state *ecs) | |
4241 | { | |
4242 | if (ecs->event_thread->stop_requested) | |
4243 | { | |
4244 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4245 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4246 | handle_signal_stop (ecs); | |
4247 | return true; | |
4248 | } | |
4249 | return false; | |
4250 | } | |
4251 | ||
a96d9b2e SDJ |
4252 | /* Auxiliary function that handles syscall entry/return events. |
4253 | It returns 1 if the inferior should keep going (and GDB | |
4254 | should ignore the event), or 0 if the event deserves to be | |
4255 | processed. */ | |
ca2163eb | 4256 | |
a96d9b2e | 4257 | static int |
ca2163eb | 4258 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4259 | { |
ca2163eb | 4260 | struct regcache *regcache; |
ca2163eb PA |
4261 | int syscall_number; |
4262 | ||
4263 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
4264 | context_switch (ecs->ptid); | |
4265 | ||
4266 | regcache = get_thread_regcache (ecs->ptid); | |
f90263c1 | 4267 | syscall_number = ecs->ws.value.syscall_number; |
ca2163eb PA |
4268 | stop_pc = regcache_read_pc (regcache); |
4269 | ||
a96d9b2e SDJ |
4270 | if (catch_syscall_enabled () > 0 |
4271 | && catching_syscall_number (syscall_number) > 0) | |
4272 | { | |
4273 | if (debug_infrun) | |
4274 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
4275 | syscall_number); | |
a96d9b2e | 4276 | |
16c381f0 | 4277 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4278 | = bpstat_stop_status (get_regcache_aspace (regcache), |
09ac7c10 | 4279 | stop_pc, ecs->ptid, &ecs->ws); |
ab04a2af | 4280 | |
c65d6b55 PA |
4281 | if (handle_stop_requested (ecs)) |
4282 | return 0; | |
4283 | ||
ce12b012 | 4284 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4285 | { |
4286 | /* Catchpoint hit. */ | |
ca2163eb PA |
4287 | return 0; |
4288 | } | |
a96d9b2e | 4289 | } |
ca2163eb | 4290 | |
c65d6b55 PA |
4291 | if (handle_stop_requested (ecs)) |
4292 | return 0; | |
4293 | ||
ca2163eb | 4294 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb PA |
4295 | keep_going (ecs); |
4296 | return 1; | |
a96d9b2e SDJ |
4297 | } |
4298 | ||
7e324e48 GB |
4299 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4300 | ||
4301 | static void | |
4302 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4303 | struct execution_control_state *ecs) | |
4304 | { | |
4305 | if (!ecs->stop_func_filled_in) | |
4306 | { | |
4307 | /* Don't care about return value; stop_func_start and stop_func_name | |
4308 | will both be 0 if it doesn't work. */ | |
4309 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
4310 | &ecs->stop_func_start, &ecs->stop_func_end); | |
4311 | ecs->stop_func_start | |
4312 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4313 | ||
591a12a1 UW |
4314 | if (gdbarch_skip_entrypoint_p (gdbarch)) |
4315 | ecs->stop_func_start = gdbarch_skip_entrypoint (gdbarch, | |
4316 | ecs->stop_func_start); | |
4317 | ||
7e324e48 GB |
4318 | ecs->stop_func_filled_in = 1; |
4319 | } | |
4320 | } | |
4321 | ||
4f5d7f63 PA |
4322 | |
4323 | /* Return the STOP_SOON field of the inferior pointed at by PTID. */ | |
4324 | ||
4325 | static enum stop_kind | |
4326 | get_inferior_stop_soon (ptid_t ptid) | |
4327 | { | |
c9657e70 | 4328 | struct inferior *inf = find_inferior_ptid (ptid); |
4f5d7f63 PA |
4329 | |
4330 | gdb_assert (inf != NULL); | |
4331 | return inf->control.stop_soon; | |
4332 | } | |
4333 | ||
372316f1 PA |
4334 | /* Wait for one event. Store the resulting waitstatus in WS, and |
4335 | return the event ptid. */ | |
4336 | ||
4337 | static ptid_t | |
4338 | wait_one (struct target_waitstatus *ws) | |
4339 | { | |
4340 | ptid_t event_ptid; | |
4341 | ptid_t wait_ptid = minus_one_ptid; | |
4342 | ||
4343 | overlay_cache_invalid = 1; | |
4344 | ||
4345 | /* Flush target cache before starting to handle each event. | |
4346 | Target was running and cache could be stale. This is just a | |
4347 | heuristic. Running threads may modify target memory, but we | |
4348 | don't get any event. */ | |
4349 | target_dcache_invalidate (); | |
4350 | ||
4351 | if (deprecated_target_wait_hook) | |
4352 | event_ptid = deprecated_target_wait_hook (wait_ptid, ws, 0); | |
4353 | else | |
4354 | event_ptid = target_wait (wait_ptid, ws, 0); | |
4355 | ||
4356 | if (debug_infrun) | |
4357 | print_target_wait_results (wait_ptid, event_ptid, ws); | |
4358 | ||
4359 | return event_ptid; | |
4360 | } | |
4361 | ||
4362 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID | |
4363 | instead of the current thread. */ | |
4364 | #define THREAD_STOPPED_BY(REASON) \ | |
4365 | static int \ | |
4366 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4367 | { \ | |
4368 | struct cleanup *old_chain; \ | |
4369 | int res; \ | |
4370 | \ | |
4371 | old_chain = save_inferior_ptid (); \ | |
4372 | inferior_ptid = ptid; \ | |
4373 | \ | |
4374 | res = target_stopped_by_ ## REASON (); \ | |
4375 | \ | |
4376 | do_cleanups (old_chain); \ | |
4377 | \ | |
4378 | return res; \ | |
4379 | } | |
4380 | ||
4381 | /* Generate thread_stopped_by_watchpoint. */ | |
4382 | THREAD_STOPPED_BY (watchpoint) | |
4383 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4384 | THREAD_STOPPED_BY (sw_breakpoint) | |
4385 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4386 | THREAD_STOPPED_BY (hw_breakpoint) | |
4387 | ||
4388 | /* Cleanups that switches to the PTID pointed at by PTID_P. */ | |
4389 | ||
4390 | static void | |
4391 | switch_to_thread_cleanup (void *ptid_p) | |
4392 | { | |
4393 | ptid_t ptid = *(ptid_t *) ptid_p; | |
4394 | ||
4395 | switch_to_thread (ptid); | |
4396 | } | |
4397 | ||
4398 | /* Save the thread's event and stop reason to process it later. */ | |
4399 | ||
4400 | static void | |
4401 | save_waitstatus (struct thread_info *tp, struct target_waitstatus *ws) | |
4402 | { | |
4403 | struct regcache *regcache; | |
4404 | struct address_space *aspace; | |
4405 | ||
4406 | if (debug_infrun) | |
4407 | { | |
4408 | char *statstr; | |
4409 | ||
4410 | statstr = target_waitstatus_to_string (ws); | |
4411 | fprintf_unfiltered (gdb_stdlog, | |
4412 | "infrun: saving status %s for %d.%ld.%ld\n", | |
4413 | statstr, | |
4414 | ptid_get_pid (tp->ptid), | |
4415 | ptid_get_lwp (tp->ptid), | |
4416 | ptid_get_tid (tp->ptid)); | |
4417 | xfree (statstr); | |
4418 | } | |
4419 | ||
4420 | /* Record for later. */ | |
4421 | tp->suspend.waitstatus = *ws; | |
4422 | tp->suspend.waitstatus_pending_p = 1; | |
4423 | ||
4424 | regcache = get_thread_regcache (tp->ptid); | |
4425 | aspace = get_regcache_aspace (regcache); | |
4426 | ||
4427 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4428 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4429 | { | |
4430 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4431 | ||
4432 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4433 | ||
4434 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4435 | { | |
4436 | tp->suspend.stop_reason | |
4437 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4438 | } | |
4439 | else if (target_supports_stopped_by_sw_breakpoint () | |
4440 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4441 | { | |
4442 | tp->suspend.stop_reason | |
4443 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4444 | } | |
4445 | else if (target_supports_stopped_by_hw_breakpoint () | |
4446 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4447 | { | |
4448 | tp->suspend.stop_reason | |
4449 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4450 | } | |
4451 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4452 | && hardware_breakpoint_inserted_here_p (aspace, | |
4453 | pc)) | |
4454 | { | |
4455 | tp->suspend.stop_reason | |
4456 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4457 | } | |
4458 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4459 | && software_breakpoint_inserted_here_p (aspace, | |
4460 | pc)) | |
4461 | { | |
4462 | tp->suspend.stop_reason | |
4463 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4464 | } | |
4465 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4466 | && currently_stepping (tp)) | |
4467 | { | |
4468 | tp->suspend.stop_reason | |
4469 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4470 | } | |
4471 | } | |
4472 | } | |
4473 | ||
65706a29 PA |
4474 | /* A cleanup that disables thread create/exit events. */ |
4475 | ||
4476 | static void | |
4477 | disable_thread_events (void *arg) | |
4478 | { | |
4479 | target_thread_events (0); | |
4480 | } | |
4481 | ||
6efcd9a8 | 4482 | /* See infrun.h. */ |
372316f1 | 4483 | |
6efcd9a8 | 4484 | void |
372316f1 PA |
4485 | stop_all_threads (void) |
4486 | { | |
4487 | /* We may need multiple passes to discover all threads. */ | |
4488 | int pass; | |
4489 | int iterations = 0; | |
4490 | ptid_t entry_ptid; | |
4491 | struct cleanup *old_chain; | |
4492 | ||
fbea99ea | 4493 | gdb_assert (target_is_non_stop_p ()); |
372316f1 PA |
4494 | |
4495 | if (debug_infrun) | |
4496 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n"); | |
4497 | ||
4498 | entry_ptid = inferior_ptid; | |
4499 | old_chain = make_cleanup (switch_to_thread_cleanup, &entry_ptid); | |
4500 | ||
65706a29 PA |
4501 | target_thread_events (1); |
4502 | make_cleanup (disable_thread_events, NULL); | |
4503 | ||
372316f1 PA |
4504 | /* Request threads to stop, and then wait for the stops. Because |
4505 | threads we already know about can spawn more threads while we're | |
4506 | trying to stop them, and we only learn about new threads when we | |
4507 | update the thread list, do this in a loop, and keep iterating | |
4508 | until two passes find no threads that need to be stopped. */ | |
4509 | for (pass = 0; pass < 2; pass++, iterations++) | |
4510 | { | |
4511 | if (debug_infrun) | |
4512 | fprintf_unfiltered (gdb_stdlog, | |
4513 | "infrun: stop_all_threads, pass=%d, " | |
4514 | "iterations=%d\n", pass, iterations); | |
4515 | while (1) | |
4516 | { | |
4517 | ptid_t event_ptid; | |
4518 | struct target_waitstatus ws; | |
4519 | int need_wait = 0; | |
4520 | struct thread_info *t; | |
4521 | ||
4522 | update_thread_list (); | |
4523 | ||
4524 | /* Go through all threads looking for threads that we need | |
4525 | to tell the target to stop. */ | |
4526 | ALL_NON_EXITED_THREADS (t) | |
4527 | { | |
4528 | if (t->executing) | |
4529 | { | |
4530 | /* If already stopping, don't request a stop again. | |
4531 | We just haven't seen the notification yet. */ | |
4532 | if (!t->stop_requested) | |
4533 | { | |
4534 | if (debug_infrun) | |
4535 | fprintf_unfiltered (gdb_stdlog, | |
4536 | "infrun: %s executing, " | |
4537 | "need stop\n", | |
4538 | target_pid_to_str (t->ptid)); | |
4539 | target_stop (t->ptid); | |
4540 | t->stop_requested = 1; | |
4541 | } | |
4542 | else | |
4543 | { | |
4544 | if (debug_infrun) | |
4545 | fprintf_unfiltered (gdb_stdlog, | |
4546 | "infrun: %s executing, " | |
4547 | "already stopping\n", | |
4548 | target_pid_to_str (t->ptid)); | |
4549 | } | |
4550 | ||
4551 | if (t->stop_requested) | |
4552 | need_wait = 1; | |
4553 | } | |
4554 | else | |
4555 | { | |
4556 | if (debug_infrun) | |
4557 | fprintf_unfiltered (gdb_stdlog, | |
4558 | "infrun: %s not executing\n", | |
4559 | target_pid_to_str (t->ptid)); | |
4560 | ||
4561 | /* The thread may be not executing, but still be | |
4562 | resumed with a pending status to process. */ | |
4563 | t->resumed = 0; | |
4564 | } | |
4565 | } | |
4566 | ||
4567 | if (!need_wait) | |
4568 | break; | |
4569 | ||
4570 | /* If we find new threads on the second iteration, restart | |
4571 | over. We want to see two iterations in a row with all | |
4572 | threads stopped. */ | |
4573 | if (pass > 0) | |
4574 | pass = -1; | |
4575 | ||
4576 | event_ptid = wait_one (&ws); | |
4577 | if (ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4578 | { | |
4579 | /* All resumed threads exited. */ | |
4580 | } | |
65706a29 PA |
4581 | else if (ws.kind == TARGET_WAITKIND_THREAD_EXITED |
4582 | || ws.kind == TARGET_WAITKIND_EXITED | |
372316f1 PA |
4583 | || ws.kind == TARGET_WAITKIND_SIGNALLED) |
4584 | { | |
4585 | if (debug_infrun) | |
4586 | { | |
4587 | ptid_t ptid = pid_to_ptid (ws.value.integer); | |
4588 | ||
4589 | fprintf_unfiltered (gdb_stdlog, | |
4590 | "infrun: %s exited while " | |
4591 | "stopping threads\n", | |
4592 | target_pid_to_str (ptid)); | |
4593 | } | |
4594 | } | |
4595 | else | |
4596 | { | |
6efcd9a8 PA |
4597 | struct inferior *inf; |
4598 | ||
372316f1 PA |
4599 | t = find_thread_ptid (event_ptid); |
4600 | if (t == NULL) | |
4601 | t = add_thread (event_ptid); | |
4602 | ||
4603 | t->stop_requested = 0; | |
4604 | t->executing = 0; | |
4605 | t->resumed = 0; | |
4606 | t->control.may_range_step = 0; | |
4607 | ||
6efcd9a8 PA |
4608 | /* This may be the first time we see the inferior report |
4609 | a stop. */ | |
4610 | inf = find_inferior_ptid (event_ptid); | |
4611 | if (inf->needs_setup) | |
4612 | { | |
4613 | switch_to_thread_no_regs (t); | |
4614 | setup_inferior (0); | |
4615 | } | |
4616 | ||
372316f1 PA |
4617 | if (ws.kind == TARGET_WAITKIND_STOPPED |
4618 | && ws.value.sig == GDB_SIGNAL_0) | |
4619 | { | |
4620 | /* We caught the event that we intended to catch, so | |
4621 | there's no event pending. */ | |
4622 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4623 | t->suspend.waitstatus_pending_p = 0; | |
4624 | ||
4625 | if (displaced_step_fixup (t->ptid, GDB_SIGNAL_0) < 0) | |
4626 | { | |
4627 | /* Add it back to the step-over queue. */ | |
4628 | if (debug_infrun) | |
4629 | { | |
4630 | fprintf_unfiltered (gdb_stdlog, | |
4631 | "infrun: displaced-step of %s " | |
4632 | "canceled: adding back to the " | |
4633 | "step-over queue\n", | |
4634 | target_pid_to_str (t->ptid)); | |
4635 | } | |
4636 | t->control.trap_expected = 0; | |
4637 | thread_step_over_chain_enqueue (t); | |
4638 | } | |
4639 | } | |
4640 | else | |
4641 | { | |
4642 | enum gdb_signal sig; | |
4643 | struct regcache *regcache; | |
372316f1 PA |
4644 | |
4645 | if (debug_infrun) | |
4646 | { | |
4647 | char *statstr; | |
4648 | ||
4649 | statstr = target_waitstatus_to_string (&ws); | |
4650 | fprintf_unfiltered (gdb_stdlog, | |
4651 | "infrun: target_wait %s, saving " | |
4652 | "status for %d.%ld.%ld\n", | |
4653 | statstr, | |
4654 | ptid_get_pid (t->ptid), | |
4655 | ptid_get_lwp (t->ptid), | |
4656 | ptid_get_tid (t->ptid)); | |
4657 | xfree (statstr); | |
4658 | } | |
4659 | ||
4660 | /* Record for later. */ | |
4661 | save_waitstatus (t, &ws); | |
4662 | ||
4663 | sig = (ws.kind == TARGET_WAITKIND_STOPPED | |
4664 | ? ws.value.sig : GDB_SIGNAL_0); | |
4665 | ||
4666 | if (displaced_step_fixup (t->ptid, sig) < 0) | |
4667 | { | |
4668 | /* Add it back to the step-over queue. */ | |
4669 | t->control.trap_expected = 0; | |
4670 | thread_step_over_chain_enqueue (t); | |
4671 | } | |
4672 | ||
4673 | regcache = get_thread_regcache (t->ptid); | |
4674 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4675 | ||
4676 | if (debug_infrun) | |
4677 | { | |
4678 | fprintf_unfiltered (gdb_stdlog, | |
4679 | "infrun: saved stop_pc=%s for %s " | |
4680 | "(currently_stepping=%d)\n", | |
4681 | paddress (target_gdbarch (), | |
4682 | t->suspend.stop_pc), | |
4683 | target_pid_to_str (t->ptid), | |
4684 | currently_stepping (t)); | |
4685 | } | |
4686 | } | |
4687 | } | |
4688 | } | |
4689 | } | |
4690 | ||
4691 | do_cleanups (old_chain); | |
4692 | ||
4693 | if (debug_infrun) | |
4694 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n"); | |
4695 | } | |
4696 | ||
f4836ba9 PA |
4697 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4698 | ||
4699 | static int | |
4700 | handle_no_resumed (struct execution_control_state *ecs) | |
4701 | { | |
4702 | struct inferior *inf; | |
4703 | struct thread_info *thread; | |
4704 | ||
3b12939d | 4705 | if (target_can_async_p ()) |
f4836ba9 | 4706 | { |
3b12939d PA |
4707 | struct ui *ui; |
4708 | int any_sync = 0; | |
f4836ba9 | 4709 | |
3b12939d PA |
4710 | ALL_UIS (ui) |
4711 | { | |
4712 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4713 | { | |
4714 | any_sync = 1; | |
4715 | break; | |
4716 | } | |
4717 | } | |
4718 | if (!any_sync) | |
4719 | { | |
4720 | /* There were no unwaited-for children left in the target, but, | |
4721 | we're not synchronously waiting for events either. Just | |
4722 | ignore. */ | |
4723 | ||
4724 | if (debug_infrun) | |
4725 | fprintf_unfiltered (gdb_stdlog, | |
4726 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4727 | "(ignoring: bg)\n"); | |
4728 | prepare_to_wait (ecs); | |
4729 | return 1; | |
4730 | } | |
f4836ba9 PA |
4731 | } |
4732 | ||
4733 | /* Otherwise, if we were running a synchronous execution command, we | |
4734 | may need to cancel it and give the user back the terminal. | |
4735 | ||
4736 | In non-stop mode, the target can't tell whether we've already | |
4737 | consumed previous stop events, so it can end up sending us a | |
4738 | no-resumed event like so: | |
4739 | ||
4740 | #0 - thread 1 is left stopped | |
4741 | ||
4742 | #1 - thread 2 is resumed and hits breakpoint | |
4743 | -> TARGET_WAITKIND_STOPPED | |
4744 | ||
4745 | #2 - thread 3 is resumed and exits | |
4746 | this is the last resumed thread, so | |
4747 | -> TARGET_WAITKIND_NO_RESUMED | |
4748 | ||
4749 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4750 | it. | |
4751 | ||
4752 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4753 | thread 2 is now resumed, so the event should be ignored. | |
4754 | ||
4755 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4756 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4757 | event. But it could be that the event meant that thread 2 itself | |
4758 | (or whatever other thread was the last resumed thread) exited. | |
4759 | ||
4760 | To address this we refresh the thread list and check whether we | |
4761 | have resumed threads _now_. In the example above, this removes | |
4762 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4763 | ignore this event. If we find no thread resumed, then we cancel | |
4764 | the synchronous command show "no unwaited-for " to the user. */ | |
4765 | update_thread_list (); | |
4766 | ||
4767 | ALL_NON_EXITED_THREADS (thread) | |
4768 | { | |
4769 | if (thread->executing | |
4770 | || thread->suspend.waitstatus_pending_p) | |
4771 | { | |
4772 | /* There were no unwaited-for children left in the target at | |
4773 | some point, but there are now. Just ignore. */ | |
4774 | if (debug_infrun) | |
4775 | fprintf_unfiltered (gdb_stdlog, | |
4776 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4777 | "(ignoring: found resumed)\n"); | |
4778 | prepare_to_wait (ecs); | |
4779 | return 1; | |
4780 | } | |
4781 | } | |
4782 | ||
4783 | /* Note however that we may find no resumed thread because the whole | |
4784 | process exited meanwhile (thus updating the thread list results | |
4785 | in an empty thread list). In this case we know we'll be getting | |
4786 | a process exit event shortly. */ | |
4787 | ALL_INFERIORS (inf) | |
4788 | { | |
4789 | if (inf->pid == 0) | |
4790 | continue; | |
4791 | ||
4792 | thread = any_live_thread_of_process (inf->pid); | |
4793 | if (thread == NULL) | |
4794 | { | |
4795 | if (debug_infrun) | |
4796 | fprintf_unfiltered (gdb_stdlog, | |
4797 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4798 | "(expect process exit)\n"); | |
4799 | prepare_to_wait (ecs); | |
4800 | return 1; | |
4801 | } | |
4802 | } | |
4803 | ||
4804 | /* Go ahead and report the event. */ | |
4805 | return 0; | |
4806 | } | |
4807 | ||
05ba8510 PA |
4808 | /* Given an execution control state that has been freshly filled in by |
4809 | an event from the inferior, figure out what it means and take | |
4810 | appropriate action. | |
4811 | ||
4812 | The alternatives are: | |
4813 | ||
22bcd14b | 4814 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
4815 | debugger. |
4816 | ||
4817 | 2) keep_going and return; to wait for the next event (set | |
4818 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
4819 | once). */ | |
c906108c | 4820 | |
ec9499be | 4821 | static void |
0b6e5e10 | 4822 | handle_inferior_event_1 (struct execution_control_state *ecs) |
cd0fc7c3 | 4823 | { |
d6b48e9c PA |
4824 | enum stop_kind stop_soon; |
4825 | ||
28736962 PA |
4826 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
4827 | { | |
4828 | /* We had an event in the inferior, but we are not interested in | |
4829 | handling it at this level. The lower layers have already | |
4830 | done what needs to be done, if anything. | |
4831 | ||
4832 | One of the possible circumstances for this is when the | |
4833 | inferior produces output for the console. The inferior has | |
4834 | not stopped, and we are ignoring the event. Another possible | |
4835 | circumstance is any event which the lower level knows will be | |
4836 | reported multiple times without an intervening resume. */ | |
4837 | if (debug_infrun) | |
4838 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
4839 | prepare_to_wait (ecs); | |
4840 | return; | |
4841 | } | |
4842 | ||
65706a29 PA |
4843 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
4844 | { | |
4845 | if (debug_infrun) | |
4846 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_THREAD_EXITED\n"); | |
4847 | prepare_to_wait (ecs); | |
4848 | return; | |
4849 | } | |
4850 | ||
0e5bf2a8 | 4851 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
4852 | && handle_no_resumed (ecs)) |
4853 | return; | |
0e5bf2a8 | 4854 | |
1777feb0 | 4855 | /* Cache the last pid/waitstatus. */ |
c32c64b7 | 4856 | set_last_target_status (ecs->ptid, ecs->ws); |
e02bc4cc | 4857 | |
ca005067 | 4858 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 4859 | stop_stack_dummy = STOP_NONE; |
ca005067 | 4860 | |
0e5bf2a8 PA |
4861 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
4862 | { | |
4863 | /* No unwaited-for children left. IOW, all resumed children | |
4864 | have exited. */ | |
4865 | if (debug_infrun) | |
4866 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
4867 | ||
4868 | stop_print_frame = 0; | |
22bcd14b | 4869 | stop_waiting (ecs); |
0e5bf2a8 PA |
4870 | return; |
4871 | } | |
4872 | ||
8c90c137 | 4873 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 4874 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 PA |
4875 | { |
4876 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
4877 | /* If it's a new thread, add it to the thread database. */ | |
4878 | if (ecs->event_thread == NULL) | |
4879 | ecs->event_thread = add_thread (ecs->ptid); | |
c1e36e3e PA |
4880 | |
4881 | /* Disable range stepping. If the next step request could use a | |
4882 | range, this will be end up re-enabled then. */ | |
4883 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 4884 | } |
88ed393a JK |
4885 | |
4886 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 4887 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
4888 | |
4889 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
4890 | reinit_frame_cache (); | |
4891 | ||
28736962 PA |
4892 | breakpoint_retire_moribund (); |
4893 | ||
2b009048 DJ |
4894 | /* First, distinguish signals caused by the debugger from signals |
4895 | that have to do with the program's own actions. Note that | |
4896 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
4897 | on the operating system version. Here we detect when a SIGILL or | |
4898 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
4899 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
4900 | when we're trying to execute a breakpoint instruction on a | |
4901 | non-executable stack. This happens for call dummy breakpoints | |
4902 | for architectures like SPARC that place call dummies on the | |
4903 | stack. */ | |
2b009048 | 4904 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
4905 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
4906 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
4907 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 4908 | { |
de0a0249 UW |
4909 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
4910 | ||
4911 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
4912 | regcache_read_pc (regcache))) | |
4913 | { | |
4914 | if (debug_infrun) | |
4915 | fprintf_unfiltered (gdb_stdlog, | |
4916 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 4917 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 4918 | } |
2b009048 DJ |
4919 | } |
4920 | ||
28736962 PA |
4921 | /* Mark the non-executing threads accordingly. In all-stop, all |
4922 | threads of all processes are stopped when we get any event | |
e1316e60 | 4923 | reported. In non-stop mode, only the event thread stops. */ |
372316f1 PA |
4924 | { |
4925 | ptid_t mark_ptid; | |
4926 | ||
fbea99ea | 4927 | if (!target_is_non_stop_p ()) |
372316f1 PA |
4928 | mark_ptid = minus_one_ptid; |
4929 | else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED | |
4930 | || ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4931 | { | |
4932 | /* If we're handling a process exit in non-stop mode, even | |
4933 | though threads haven't been deleted yet, one would think | |
4934 | that there is nothing to do, as threads of the dead process | |
4935 | will be soon deleted, and threads of any other process were | |
4936 | left running. However, on some targets, threads survive a | |
4937 | process exit event. E.g., for the "checkpoint" command, | |
4938 | when the current checkpoint/fork exits, linux-fork.c | |
4939 | automatically switches to another fork from within | |
4940 | target_mourn_inferior, by associating the same | |
4941 | inferior/thread to another fork. We haven't mourned yet at | |
4942 | this point, but we must mark any threads left in the | |
4943 | process as not-executing so that finish_thread_state marks | |
4944 | them stopped (in the user's perspective) if/when we present | |
4945 | the stop to the user. */ | |
4946 | mark_ptid = pid_to_ptid (ptid_get_pid (ecs->ptid)); | |
4947 | } | |
4948 | else | |
4949 | mark_ptid = ecs->ptid; | |
4950 | ||
4951 | set_executing (mark_ptid, 0); | |
4952 | ||
4953 | /* Likewise the resumed flag. */ | |
4954 | set_resumed (mark_ptid, 0); | |
4955 | } | |
8c90c137 | 4956 | |
488f131b JB |
4957 | switch (ecs->ws.kind) |
4958 | { | |
4959 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 4960 | if (debug_infrun) |
8a9de0e4 | 4961 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
5c09a2c5 PA |
4962 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
4963 | context_switch (ecs->ptid); | |
b0f4b84b DJ |
4964 | /* Ignore gracefully during startup of the inferior, as it might |
4965 | be the shell which has just loaded some objects, otherwise | |
4966 | add the symbols for the newly loaded objects. Also ignore at | |
4967 | the beginning of an attach or remote session; we will query | |
4968 | the full list of libraries once the connection is | |
4969 | established. */ | |
4f5d7f63 PA |
4970 | |
4971 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
c0236d92 | 4972 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 4973 | { |
edcc5120 TT |
4974 | struct regcache *regcache; |
4975 | ||
edcc5120 TT |
4976 | regcache = get_thread_regcache (ecs->ptid); |
4977 | ||
4978 | handle_solib_event (); | |
4979 | ||
4980 | ecs->event_thread->control.stop_bpstat | |
4981 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
4982 | stop_pc, ecs->ptid, &ecs->ws); | |
ab04a2af | 4983 | |
c65d6b55 PA |
4984 | if (handle_stop_requested (ecs)) |
4985 | return; | |
4986 | ||
ce12b012 | 4987 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
4988 | { |
4989 | /* A catchpoint triggered. */ | |
94c57d6a PA |
4990 | process_event_stop_test (ecs); |
4991 | return; | |
edcc5120 | 4992 | } |
488f131b | 4993 | |
b0f4b84b DJ |
4994 | /* If requested, stop when the dynamic linker notifies |
4995 | gdb of events. This allows the user to get control | |
4996 | and place breakpoints in initializer routines for | |
4997 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 4998 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
4999 | if (stop_on_solib_events) |
5000 | { | |
55409f9d DJ |
5001 | /* Make sure we print "Stopped due to solib-event" in |
5002 | normal_stop. */ | |
5003 | stop_print_frame = 1; | |
5004 | ||
22bcd14b | 5005 | stop_waiting (ecs); |
b0f4b84b DJ |
5006 | return; |
5007 | } | |
488f131b | 5008 | } |
b0f4b84b DJ |
5009 | |
5010 | /* If we are skipping through a shell, or through shared library | |
5011 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 5012 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
5013 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
5014 | { | |
74960c60 VP |
5015 | /* Loading of shared libraries might have changed breakpoint |
5016 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 5017 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 5018 | insert_breakpoints (); |
64ce06e4 | 5019 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
5020 | prepare_to_wait (ecs); |
5021 | return; | |
5022 | } | |
5023 | ||
5c09a2c5 PA |
5024 | /* But stop if we're attaching or setting up a remote |
5025 | connection. */ | |
5026 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5027 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5028 | { | |
5029 | if (debug_infrun) | |
5030 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 5031 | stop_waiting (ecs); |
5c09a2c5 PA |
5032 | return; |
5033 | } | |
5034 | ||
5035 | internal_error (__FILE__, __LINE__, | |
5036 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 5037 | |
488f131b | 5038 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 5039 | if (debug_infrun) |
8a9de0e4 | 5040 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
c65d6b55 PA |
5041 | if (handle_stop_requested (ecs)) |
5042 | return; | |
64776a0b | 5043 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
8b3ee56d | 5044 | context_switch (ecs->ptid); |
64ce06e4 | 5045 | resume (GDB_SIGNAL_0); |
488f131b JB |
5046 | prepare_to_wait (ecs); |
5047 | return; | |
c5aa993b | 5048 | |
65706a29 PA |
5049 | case TARGET_WAITKIND_THREAD_CREATED: |
5050 | if (debug_infrun) | |
5051 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_THREAD_CREATED\n"); | |
c65d6b55 PA |
5052 | if (handle_stop_requested (ecs)) |
5053 | return; | |
65706a29 PA |
5054 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
5055 | context_switch (ecs->ptid); | |
5056 | if (!switch_back_to_stepped_thread (ecs)) | |
5057 | keep_going (ecs); | |
5058 | return; | |
5059 | ||
488f131b | 5060 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5061 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 5062 | if (debug_infrun) |
940c3c06 PA |
5063 | { |
5064 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
5065 | fprintf_unfiltered (gdb_stdlog, | |
5066 | "infrun: TARGET_WAITKIND_EXITED\n"); | |
5067 | else | |
5068 | fprintf_unfiltered (gdb_stdlog, | |
5069 | "infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
5070 | } | |
5071 | ||
fb66883a | 5072 | inferior_ptid = ecs->ptid; |
c9657e70 | 5073 | set_current_inferior (find_inferior_ptid (ecs->ptid)); |
6c95b8df PA |
5074 | set_current_program_space (current_inferior ()->pspace); |
5075 | handle_vfork_child_exec_or_exit (0); | |
1777feb0 | 5076 | target_terminal_ours (); /* Must do this before mourn anyway. */ |
488f131b | 5077 | |
0c557179 SDJ |
5078 | /* Clearing any previous state of convenience variables. */ |
5079 | clear_exit_convenience_vars (); | |
5080 | ||
940c3c06 PA |
5081 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5082 | { | |
5083 | /* Record the exit code in the convenience variable $_exitcode, so | |
5084 | that the user can inspect this again later. */ | |
5085 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5086 | (LONGEST) ecs->ws.value.integer); | |
5087 | ||
5088 | /* Also record this in the inferior itself. */ | |
5089 | current_inferior ()->has_exit_code = 1; | |
5090 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5091 | |
98eb56a4 PA |
5092 | /* Support the --return-child-result option. */ |
5093 | return_child_result_value = ecs->ws.value.integer; | |
5094 | ||
fd664c91 | 5095 | observer_notify_exited (ecs->ws.value.integer); |
940c3c06 PA |
5096 | } |
5097 | else | |
0c557179 SDJ |
5098 | { |
5099 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
5100 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
5101 | ||
5102 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5103 | { | |
5104 | /* Set the value of the internal variable $_exitsignal, | |
5105 | which holds the signal uncaught by the inferior. */ | |
5106 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5107 | gdbarch_gdb_signal_to_target (gdbarch, | |
5108 | ecs->ws.value.sig)); | |
5109 | } | |
5110 | else | |
5111 | { | |
5112 | /* We don't have access to the target's method used for | |
5113 | converting between signal numbers (GDB's internal | |
5114 | representation <-> target's representation). | |
5115 | Therefore, we cannot do a good job at displaying this | |
5116 | information to the user. It's better to just warn | |
5117 | her about it (if infrun debugging is enabled), and | |
5118 | give up. */ | |
5119 | if (debug_infrun) | |
5120 | fprintf_filtered (gdb_stdlog, _("\ | |
5121 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
5122 | } | |
5123 | ||
fd664c91 | 5124 | observer_notify_signal_exited (ecs->ws.value.sig); |
0c557179 | 5125 | } |
8cf64490 | 5126 | |
488f131b | 5127 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5128 | target_mourn_inferior (inferior_ptid); |
488f131b | 5129 | stop_print_frame = 0; |
22bcd14b | 5130 | stop_waiting (ecs); |
488f131b | 5131 | return; |
c5aa993b | 5132 | |
488f131b | 5133 | /* The following are the only cases in which we keep going; |
1777feb0 | 5134 | the above cases end in a continue or goto. */ |
488f131b | 5135 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5136 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 5137 | if (debug_infrun) |
fed708ed PA |
5138 | { |
5139 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
5140 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); | |
5141 | else | |
5142 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n"); | |
5143 | } | |
c906108c | 5144 | |
e2d96639 YQ |
5145 | /* Check whether the inferior is displaced stepping. */ |
5146 | { | |
5147 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
5148 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
e2d96639 YQ |
5149 | |
5150 | /* If checking displaced stepping is supported, and thread | |
5151 | ecs->ptid is displaced stepping. */ | |
c0987663 | 5152 | if (displaced_step_in_progress_thread (ecs->ptid)) |
e2d96639 YQ |
5153 | { |
5154 | struct inferior *parent_inf | |
c9657e70 | 5155 | = find_inferior_ptid (ecs->ptid); |
e2d96639 YQ |
5156 | struct regcache *child_regcache; |
5157 | CORE_ADDR parent_pc; | |
5158 | ||
5159 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
5160 | indicating that the displaced stepping of syscall instruction | |
5161 | has been done. Perform cleanup for parent process here. Note | |
5162 | that this operation also cleans up the child process for vfork, | |
5163 | because their pages are shared. */ | |
a493e3e2 | 5164 | displaced_step_fixup (ecs->ptid, GDB_SIGNAL_TRAP); |
c2829269 PA |
5165 | /* Start a new step-over in another thread if there's one |
5166 | that needs it. */ | |
5167 | start_step_over (); | |
e2d96639 YQ |
5168 | |
5169 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
5170 | { | |
c0987663 YQ |
5171 | struct displaced_step_inferior_state *displaced |
5172 | = get_displaced_stepping_state (ptid_get_pid (ecs->ptid)); | |
5173 | ||
e2d96639 YQ |
5174 | /* Restore scratch pad for child process. */ |
5175 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
5176 | } | |
5177 | ||
5178 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
5179 | the child's PC is also within the scratchpad. Set the child's PC | |
5180 | to the parent's PC value, which has already been fixed up. | |
5181 | FIXME: we use the parent's aspace here, although we're touching | |
5182 | the child, because the child hasn't been added to the inferior | |
5183 | list yet at this point. */ | |
5184 | ||
5185 | child_regcache | |
5186 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
5187 | gdbarch, | |
5188 | parent_inf->aspace); | |
5189 | /* Read PC value of parent process. */ | |
5190 | parent_pc = regcache_read_pc (regcache); | |
5191 | ||
5192 | if (debug_displaced) | |
5193 | fprintf_unfiltered (gdb_stdlog, | |
5194 | "displaced: write child pc from %s to %s\n", | |
5195 | paddress (gdbarch, | |
5196 | regcache_read_pc (child_regcache)), | |
5197 | paddress (gdbarch, parent_pc)); | |
5198 | ||
5199 | regcache_write_pc (child_regcache, parent_pc); | |
5200 | } | |
5201 | } | |
5202 | ||
5a2901d9 | 5203 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 5204 | context_switch (ecs->ptid); |
5a2901d9 | 5205 | |
b242c3c2 PA |
5206 | /* Immediately detach breakpoints from the child before there's |
5207 | any chance of letting the user delete breakpoints from the | |
5208 | breakpoint lists. If we don't do this early, it's easy to | |
5209 | leave left over traps in the child, vis: "break foo; catch | |
5210 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5211 | the fork on the last `continue', and by that time the | |
5212 | breakpoint at "foo" is long gone from the breakpoint table. | |
5213 | If we vforked, then we don't need to unpatch here, since both | |
5214 | parent and child are sharing the same memory pages; we'll | |
5215 | need to unpatch at follow/detach time instead to be certain | |
5216 | that new breakpoints added between catchpoint hit time and | |
5217 | vfork follow are detached. */ | |
5218 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5219 | { | |
b242c3c2 PA |
5220 | /* This won't actually modify the breakpoint list, but will |
5221 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5222 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5223 | } |
5224 | ||
34b7e8a6 | 5225 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5226 | |
e58b0e63 PA |
5227 | /* In case the event is caught by a catchpoint, remember that |
5228 | the event is to be followed at the next resume of the thread, | |
5229 | and not immediately. */ | |
5230 | ecs->event_thread->pending_follow = ecs->ws; | |
5231 | ||
fb14de7b | 5232 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 5233 | |
16c381f0 | 5234 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 5235 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 5236 | stop_pc, ecs->ptid, &ecs->ws); |
675bf4cb | 5237 | |
c65d6b55 PA |
5238 | if (handle_stop_requested (ecs)) |
5239 | return; | |
5240 | ||
ce12b012 PA |
5241 | /* If no catchpoint triggered for this, then keep going. Note |
5242 | that we're interested in knowing the bpstat actually causes a | |
5243 | stop, not just if it may explain the signal. Software | |
5244 | watchpoints, for example, always appear in the bpstat. */ | |
5245 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5246 | { |
6c95b8df PA |
5247 | ptid_t parent; |
5248 | ptid_t child; | |
e58b0e63 | 5249 | int should_resume; |
3e43a32a MS |
5250 | int follow_child |
5251 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 5252 | |
a493e3e2 | 5253 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 PA |
5254 | |
5255 | should_resume = follow_fork (); | |
5256 | ||
6c95b8df PA |
5257 | parent = ecs->ptid; |
5258 | child = ecs->ws.value.related_pid; | |
5259 | ||
a2077e25 PA |
5260 | /* At this point, the parent is marked running, and the |
5261 | child is marked stopped. */ | |
5262 | ||
5263 | /* If not resuming the parent, mark it stopped. */ | |
5264 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
5265 | set_running (parent, 0); | |
5266 | ||
5267 | /* If resuming the child, mark it running. */ | |
5268 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
5269 | set_running (child, 1); | |
5270 | ||
6c95b8df | 5271 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5272 | if (!detach_fork && (non_stop |
5273 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5274 | { |
5275 | if (follow_child) | |
5276 | switch_to_thread (parent); | |
5277 | else | |
5278 | switch_to_thread (child); | |
5279 | ||
5280 | ecs->event_thread = inferior_thread (); | |
5281 | ecs->ptid = inferior_ptid; | |
5282 | keep_going (ecs); | |
5283 | } | |
5284 | ||
5285 | if (follow_child) | |
5286 | switch_to_thread (child); | |
5287 | else | |
5288 | switch_to_thread (parent); | |
5289 | ||
e58b0e63 PA |
5290 | ecs->event_thread = inferior_thread (); |
5291 | ecs->ptid = inferior_ptid; | |
5292 | ||
5293 | if (should_resume) | |
5294 | keep_going (ecs); | |
5295 | else | |
22bcd14b | 5296 | stop_waiting (ecs); |
04e68871 DJ |
5297 | return; |
5298 | } | |
94c57d6a PA |
5299 | process_event_stop_test (ecs); |
5300 | return; | |
488f131b | 5301 | |
6c95b8df PA |
5302 | case TARGET_WAITKIND_VFORK_DONE: |
5303 | /* Done with the shared memory region. Re-insert breakpoints in | |
5304 | the parent, and keep going. */ | |
5305 | ||
5306 | if (debug_infrun) | |
3e43a32a MS |
5307 | fprintf_unfiltered (gdb_stdlog, |
5308 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
6c95b8df PA |
5309 | |
5310 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5311 | context_switch (ecs->ptid); | |
5312 | ||
5313 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5314 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5315 | |
5316 | if (handle_stop_requested (ecs)) | |
5317 | return; | |
5318 | ||
6c95b8df PA |
5319 | /* This also takes care of reinserting breakpoints in the |
5320 | previously locked inferior. */ | |
5321 | keep_going (ecs); | |
5322 | return; | |
5323 | ||
488f131b | 5324 | case TARGET_WAITKIND_EXECD: |
527159b7 | 5325 | if (debug_infrun) |
fc5261f2 | 5326 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 5327 | |
5a2901d9 | 5328 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 5329 | context_switch (ecs->ptid); |
5a2901d9 | 5330 | |
fb14de7b | 5331 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
795e548f | 5332 | |
6c95b8df PA |
5333 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5334 | handle_vfork_child_exec_or_exit (1); | |
5335 | ||
795e548f PA |
5336 | /* This causes the eventpoints and symbol table to be reset. |
5337 | Must do this now, before trying to determine whether to | |
5338 | stop. */ | |
71b43ef8 | 5339 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5340 | |
17d8546e DB |
5341 | /* In follow_exec we may have deleted the original thread and |
5342 | created a new one. Make sure that the event thread is the | |
5343 | execd thread for that case (this is a nop otherwise). */ | |
5344 | ecs->event_thread = inferior_thread (); | |
5345 | ||
16c381f0 | 5346 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 5347 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 5348 | stop_pc, ecs->ptid, &ecs->ws); |
795e548f | 5349 | |
71b43ef8 PA |
5350 | /* Note that this may be referenced from inside |
5351 | bpstat_stop_status above, through inferior_has_execd. */ | |
5352 | xfree (ecs->ws.value.execd_pathname); | |
5353 | ecs->ws.value.execd_pathname = NULL; | |
5354 | ||
c65d6b55 PA |
5355 | if (handle_stop_requested (ecs)) |
5356 | return; | |
5357 | ||
04e68871 | 5358 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5359 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5360 | { |
a493e3e2 | 5361 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5362 | keep_going (ecs); |
5363 | return; | |
5364 | } | |
94c57d6a PA |
5365 | process_event_stop_test (ecs); |
5366 | return; | |
488f131b | 5367 | |
b4dc5ffa MK |
5368 | /* Be careful not to try to gather much state about a thread |
5369 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5370 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 5371 | if (debug_infrun) |
3e43a32a MS |
5372 | fprintf_unfiltered (gdb_stdlog, |
5373 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
1777feb0 | 5374 | /* Getting the current syscall number. */ |
94c57d6a PA |
5375 | if (handle_syscall_event (ecs) == 0) |
5376 | process_event_stop_test (ecs); | |
5377 | return; | |
c906108c | 5378 | |
488f131b JB |
5379 | /* Before examining the threads further, step this thread to |
5380 | get it entirely out of the syscall. (We get notice of the | |
5381 | event when the thread is just on the verge of exiting a | |
5382 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5383 | into user code.) */ |
488f131b | 5384 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 5385 | if (debug_infrun) |
3e43a32a MS |
5386 | fprintf_unfiltered (gdb_stdlog, |
5387 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
94c57d6a PA |
5388 | if (handle_syscall_event (ecs) == 0) |
5389 | process_event_stop_test (ecs); | |
5390 | return; | |
c906108c | 5391 | |
488f131b | 5392 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 5393 | if (debug_infrun) |
8a9de0e4 | 5394 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
4f5d7f63 PA |
5395 | handle_signal_stop (ecs); |
5396 | return; | |
c906108c | 5397 | |
b2175913 | 5398 | case TARGET_WAITKIND_NO_HISTORY: |
4b4e080e PA |
5399 | if (debug_infrun) |
5400 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
b2175913 | 5401 | /* Reverse execution: target ran out of history info. */ |
eab402df | 5402 | |
d1988021 MM |
5403 | /* Switch to the stopped thread. */ |
5404 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5405 | context_switch (ecs->ptid); | |
5406 | if (debug_infrun) | |
5407 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
5408 | ||
34b7e8a6 | 5409 | delete_just_stopped_threads_single_step_breakpoints (); |
d1988021 | 5410 | stop_pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); |
c65d6b55 PA |
5411 | |
5412 | if (handle_stop_requested (ecs)) | |
5413 | return; | |
5414 | ||
fd664c91 | 5415 | observer_notify_no_history (); |
22bcd14b | 5416 | stop_waiting (ecs); |
b2175913 | 5417 | return; |
488f131b | 5418 | } |
4f5d7f63 PA |
5419 | } |
5420 | ||
0b6e5e10 JB |
5421 | /* A wrapper around handle_inferior_event_1, which also makes sure |
5422 | that all temporary struct value objects that were created during | |
5423 | the handling of the event get deleted at the end. */ | |
5424 | ||
5425 | static void | |
5426 | handle_inferior_event (struct execution_control_state *ecs) | |
5427 | { | |
5428 | struct value *mark = value_mark (); | |
5429 | ||
5430 | handle_inferior_event_1 (ecs); | |
5431 | /* Purge all temporary values created during the event handling, | |
5432 | as it could be a long time before we return to the command level | |
5433 | where such values would otherwise be purged. */ | |
5434 | value_free_to_mark (mark); | |
5435 | } | |
5436 | ||
372316f1 PA |
5437 | /* Restart threads back to what they were trying to do back when we |
5438 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5439 | ignored. */ | |
4d9d9d04 PA |
5440 | |
5441 | static void | |
372316f1 PA |
5442 | restart_threads (struct thread_info *event_thread) |
5443 | { | |
5444 | struct thread_info *tp; | |
372316f1 PA |
5445 | |
5446 | /* In case the instruction just stepped spawned a new thread. */ | |
5447 | update_thread_list (); | |
5448 | ||
5449 | ALL_NON_EXITED_THREADS (tp) | |
5450 | { | |
5451 | if (tp == event_thread) | |
5452 | { | |
5453 | if (debug_infrun) | |
5454 | fprintf_unfiltered (gdb_stdlog, | |
5455 | "infrun: restart threads: " | |
5456 | "[%s] is event thread\n", | |
5457 | target_pid_to_str (tp->ptid)); | |
5458 | continue; | |
5459 | } | |
5460 | ||
5461 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5462 | { | |
5463 | if (debug_infrun) | |
5464 | fprintf_unfiltered (gdb_stdlog, | |
5465 | "infrun: restart threads: " | |
5466 | "[%s] not meant to be running\n", | |
5467 | target_pid_to_str (tp->ptid)); | |
5468 | continue; | |
5469 | } | |
5470 | ||
5471 | if (tp->resumed) | |
5472 | { | |
5473 | if (debug_infrun) | |
5474 | fprintf_unfiltered (gdb_stdlog, | |
5475 | "infrun: restart threads: [%s] resumed\n", | |
5476 | target_pid_to_str (tp->ptid)); | |
5477 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
5478 | continue; | |
5479 | } | |
5480 | ||
5481 | if (thread_is_in_step_over_chain (tp)) | |
5482 | { | |
5483 | if (debug_infrun) | |
5484 | fprintf_unfiltered (gdb_stdlog, | |
5485 | "infrun: restart threads: " | |
5486 | "[%s] needs step-over\n", | |
5487 | target_pid_to_str (tp->ptid)); | |
5488 | gdb_assert (!tp->resumed); | |
5489 | continue; | |
5490 | } | |
5491 | ||
5492 | ||
5493 | if (tp->suspend.waitstatus_pending_p) | |
5494 | { | |
5495 | if (debug_infrun) | |
5496 | fprintf_unfiltered (gdb_stdlog, | |
5497 | "infrun: restart threads: " | |
5498 | "[%s] has pending status\n", | |
5499 | target_pid_to_str (tp->ptid)); | |
5500 | tp->resumed = 1; | |
5501 | continue; | |
5502 | } | |
5503 | ||
c65d6b55 PA |
5504 | gdb_assert (!tp->stop_requested); |
5505 | ||
372316f1 PA |
5506 | /* If some thread needs to start a step-over at this point, it |
5507 | should still be in the step-over queue, and thus skipped | |
5508 | above. */ | |
5509 | if (thread_still_needs_step_over (tp)) | |
5510 | { | |
5511 | internal_error (__FILE__, __LINE__, | |
5512 | "thread [%s] needs a step-over, but not in " | |
5513 | "step-over queue\n", | |
5514 | target_pid_to_str (tp->ptid)); | |
5515 | } | |
5516 | ||
5517 | if (currently_stepping (tp)) | |
5518 | { | |
5519 | if (debug_infrun) | |
5520 | fprintf_unfiltered (gdb_stdlog, | |
5521 | "infrun: restart threads: [%s] was stepping\n", | |
5522 | target_pid_to_str (tp->ptid)); | |
5523 | keep_going_stepped_thread (tp); | |
5524 | } | |
5525 | else | |
5526 | { | |
5527 | struct execution_control_state ecss; | |
5528 | struct execution_control_state *ecs = &ecss; | |
5529 | ||
5530 | if (debug_infrun) | |
5531 | fprintf_unfiltered (gdb_stdlog, | |
5532 | "infrun: restart threads: [%s] continuing\n", | |
5533 | target_pid_to_str (tp->ptid)); | |
5534 | reset_ecs (ecs, tp); | |
5535 | switch_to_thread (tp->ptid); | |
5536 | keep_going_pass_signal (ecs); | |
5537 | } | |
5538 | } | |
5539 | } | |
5540 | ||
5541 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5542 | a pending waitstatus. */ | |
5543 | ||
5544 | static int | |
5545 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5546 | void *arg) | |
5547 | { | |
5548 | return (tp->resumed | |
5549 | && tp->suspend.waitstatus_pending_p); | |
5550 | } | |
5551 | ||
5552 | /* Called when we get an event that may finish an in-line or | |
5553 | out-of-line (displaced stepping) step-over started previously. | |
5554 | Return true if the event is processed and we should go back to the | |
5555 | event loop; false if the caller should continue processing the | |
5556 | event. */ | |
5557 | ||
5558 | static int | |
4d9d9d04 PA |
5559 | finish_step_over (struct execution_control_state *ecs) |
5560 | { | |
372316f1 PA |
5561 | int had_step_over_info; |
5562 | ||
4d9d9d04 PA |
5563 | displaced_step_fixup (ecs->ptid, |
5564 | ecs->event_thread->suspend.stop_signal); | |
5565 | ||
372316f1 PA |
5566 | had_step_over_info = step_over_info_valid_p (); |
5567 | ||
5568 | if (had_step_over_info) | |
4d9d9d04 PA |
5569 | { |
5570 | /* If we're stepping over a breakpoint with all threads locked, | |
5571 | then only the thread that was stepped should be reporting | |
5572 | back an event. */ | |
5573 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5574 | ||
c65d6b55 | 5575 | clear_step_over_info (); |
4d9d9d04 PA |
5576 | } |
5577 | ||
fbea99ea | 5578 | if (!target_is_non_stop_p ()) |
372316f1 | 5579 | return 0; |
4d9d9d04 PA |
5580 | |
5581 | /* Start a new step-over in another thread if there's one that | |
5582 | needs it. */ | |
5583 | start_step_over (); | |
372316f1 PA |
5584 | |
5585 | /* If we were stepping over a breakpoint before, and haven't started | |
5586 | a new in-line step-over sequence, then restart all other threads | |
5587 | (except the event thread). We can't do this in all-stop, as then | |
5588 | e.g., we wouldn't be able to issue any other remote packet until | |
5589 | these other threads stop. */ | |
5590 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5591 | { | |
5592 | struct thread_info *pending; | |
5593 | ||
5594 | /* If we only have threads with pending statuses, the restart | |
5595 | below won't restart any thread and so nothing re-inserts the | |
5596 | breakpoint we just stepped over. But we need it inserted | |
5597 | when we later process the pending events, otherwise if | |
5598 | another thread has a pending event for this breakpoint too, | |
5599 | we'd discard its event (because the breakpoint that | |
5600 | originally caused the event was no longer inserted). */ | |
5601 | context_switch (ecs->ptid); | |
5602 | insert_breakpoints (); | |
5603 | ||
5604 | restart_threads (ecs->event_thread); | |
5605 | ||
5606 | /* If we have events pending, go through handle_inferior_event | |
5607 | again, picking up a pending event at random. This avoids | |
5608 | thread starvation. */ | |
5609 | ||
5610 | /* But not if we just stepped over a watchpoint in order to let | |
5611 | the instruction execute so we can evaluate its expression. | |
5612 | The set of watchpoints that triggered is recorded in the | |
5613 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5614 | If we processed another event first, that other event could | |
5615 | clobber this info. */ | |
5616 | if (ecs->event_thread->stepping_over_watchpoint) | |
5617 | return 0; | |
5618 | ||
5619 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5620 | NULL); | |
5621 | if (pending != NULL) | |
5622 | { | |
5623 | struct thread_info *tp = ecs->event_thread; | |
5624 | struct regcache *regcache; | |
5625 | ||
5626 | if (debug_infrun) | |
5627 | { | |
5628 | fprintf_unfiltered (gdb_stdlog, | |
5629 | "infrun: found resumed threads with " | |
5630 | "pending events, saving status\n"); | |
5631 | } | |
5632 | ||
5633 | gdb_assert (pending != tp); | |
5634 | ||
5635 | /* Record the event thread's event for later. */ | |
5636 | save_waitstatus (tp, &ecs->ws); | |
5637 | /* This was cleared early, by handle_inferior_event. Set it | |
5638 | so this pending event is considered by | |
5639 | do_target_wait. */ | |
5640 | tp->resumed = 1; | |
5641 | ||
5642 | gdb_assert (!tp->executing); | |
5643 | ||
5644 | regcache = get_thread_regcache (tp->ptid); | |
5645 | tp->suspend.stop_pc = regcache_read_pc (regcache); | |
5646 | ||
5647 | if (debug_infrun) | |
5648 | { | |
5649 | fprintf_unfiltered (gdb_stdlog, | |
5650 | "infrun: saved stop_pc=%s for %s " | |
5651 | "(currently_stepping=%d)\n", | |
5652 | paddress (target_gdbarch (), | |
5653 | tp->suspend.stop_pc), | |
5654 | target_pid_to_str (tp->ptid), | |
5655 | currently_stepping (tp)); | |
5656 | } | |
5657 | ||
5658 | /* This in-line step-over finished; clear this so we won't | |
5659 | start a new one. This is what handle_signal_stop would | |
5660 | do, if we returned false. */ | |
5661 | tp->stepping_over_breakpoint = 0; | |
5662 | ||
5663 | /* Wake up the event loop again. */ | |
5664 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5665 | ||
5666 | prepare_to_wait (ecs); | |
5667 | return 1; | |
5668 | } | |
5669 | } | |
5670 | ||
5671 | return 0; | |
4d9d9d04 PA |
5672 | } |
5673 | ||
4f5d7f63 PA |
5674 | /* Come here when the program has stopped with a signal. */ |
5675 | ||
5676 | static void | |
5677 | handle_signal_stop (struct execution_control_state *ecs) | |
5678 | { | |
5679 | struct frame_info *frame; | |
5680 | struct gdbarch *gdbarch; | |
5681 | int stopped_by_watchpoint; | |
5682 | enum stop_kind stop_soon; | |
5683 | int random_signal; | |
c906108c | 5684 | |
f0407826 DE |
5685 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5686 | ||
c65d6b55 PA |
5687 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5688 | ||
f0407826 DE |
5689 | /* Do we need to clean up the state of a thread that has |
5690 | completed a displaced single-step? (Doing so usually affects | |
5691 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5692 | if (finish_step_over (ecs)) |
5693 | return; | |
f0407826 DE |
5694 | |
5695 | /* If we either finished a single-step or hit a breakpoint, but | |
5696 | the user wanted this thread to be stopped, pretend we got a | |
5697 | SIG0 (generic unsignaled stop). */ | |
5698 | if (ecs->event_thread->stop_requested | |
5699 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5700 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5701 | |
515630c5 | 5702 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 5703 | |
527159b7 | 5704 | if (debug_infrun) |
237fc4c9 | 5705 | { |
5af949e3 UW |
5706 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
5707 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7f82dfc7 JK |
5708 | struct cleanup *old_chain = save_inferior_ptid (); |
5709 | ||
5710 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
5711 | |
5712 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
5713 | paddress (gdbarch, stop_pc)); | |
d92524f1 | 5714 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5715 | { |
5716 | CORE_ADDR addr; | |
abbb1732 | 5717 | |
237fc4c9 PA |
5718 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
5719 | ||
5720 | if (target_stopped_data_address (¤t_target, &addr)) | |
5721 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5722 | "infrun: stopped data address = %s\n", |
5723 | paddress (gdbarch, addr)); | |
237fc4c9 PA |
5724 | else |
5725 | fprintf_unfiltered (gdb_stdlog, | |
5726 | "infrun: (no data address available)\n"); | |
5727 | } | |
7f82dfc7 JK |
5728 | |
5729 | do_cleanups (old_chain); | |
237fc4c9 | 5730 | } |
527159b7 | 5731 | |
36fa8042 PA |
5732 | /* This is originated from start_remote(), start_inferior() and |
5733 | shared libraries hook functions. */ | |
5734 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
5735 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) | |
5736 | { | |
5737 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5738 | context_switch (ecs->ptid); | |
5739 | if (debug_infrun) | |
5740 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
5741 | stop_print_frame = 1; | |
22bcd14b | 5742 | stop_waiting (ecs); |
36fa8042 PA |
5743 | return; |
5744 | } | |
5745 | ||
36fa8042 PA |
5746 | /* This originates from attach_command(). We need to overwrite |
5747 | the stop_signal here, because some kernels don't ignore a | |
5748 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5749 | See more comments in inferior.h. On the other hand, if we | |
5750 | get a non-SIGSTOP, report it to the user - assume the backend | |
5751 | will handle the SIGSTOP if it should show up later. | |
5752 | ||
5753 | Also consider that the attach is complete when we see a | |
5754 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5755 | target extended-remote report it instead of a SIGSTOP | |
5756 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5757 | signal, so this is no exception. | |
5758 | ||
5759 | Also consider that the attach is complete when we see a | |
5760 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5761 | the target to stop all threads of the inferior, in case the | |
5762 | low level attach operation doesn't stop them implicitly. If | |
5763 | they weren't stopped implicitly, then the stub will report a | |
5764 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5765 | other than GDB's request. */ | |
5766 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5767 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5768 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5769 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5770 | { | |
5771 | stop_print_frame = 1; | |
22bcd14b | 5772 | stop_waiting (ecs); |
36fa8042 PA |
5773 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5774 | return; | |
5775 | } | |
5776 | ||
488f131b | 5777 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
5778 | so, then switch to that thread. */ |
5779 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 5780 | { |
527159b7 | 5781 | if (debug_infrun) |
8a9de0e4 | 5782 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 5783 | |
0d1e5fa7 | 5784 | context_switch (ecs->ptid); |
c5aa993b | 5785 | |
9a4105ab | 5786 | if (deprecated_context_hook) |
5d5658a1 | 5787 | deprecated_context_hook (ptid_to_global_thread_id (ecs->ptid)); |
488f131b | 5788 | } |
c906108c | 5789 | |
568d6575 UW |
5790 | /* At this point, get hold of the now-current thread's frame. */ |
5791 | frame = get_current_frame (); | |
5792 | gdbarch = get_frame_arch (frame); | |
5793 | ||
2adfaa28 | 5794 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5795 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5796 | { |
af48d08f PA |
5797 | struct regcache *regcache; |
5798 | struct address_space *aspace; | |
5799 | CORE_ADDR pc; | |
2adfaa28 | 5800 | |
af48d08f PA |
5801 | regcache = get_thread_regcache (ecs->ptid); |
5802 | aspace = get_regcache_aspace (regcache); | |
5803 | pc = regcache_read_pc (regcache); | |
34b7e8a6 | 5804 | |
af48d08f PA |
5805 | /* However, before doing so, if this single-step breakpoint was |
5806 | actually for another thread, set this thread up for moving | |
5807 | past it. */ | |
5808 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5809 | aspace, pc)) | |
5810 | { | |
5811 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
5812 | { |
5813 | if (debug_infrun) | |
5814 | { | |
5815 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 5816 | "infrun: [%s] hit another thread's " |
34b7e8a6 PA |
5817 | "single-step breakpoint\n", |
5818 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 | 5819 | } |
af48d08f PA |
5820 | ecs->hit_singlestep_breakpoint = 1; |
5821 | } | |
5822 | } | |
5823 | else | |
5824 | { | |
5825 | if (debug_infrun) | |
5826 | { | |
5827 | fprintf_unfiltered (gdb_stdlog, | |
5828 | "infrun: [%s] hit its " | |
5829 | "single-step breakpoint\n", | |
5830 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 PA |
5831 | } |
5832 | } | |
488f131b | 5833 | } |
af48d08f | 5834 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5835 | |
963f9c80 PA |
5836 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5837 | && ecs->event_thread->control.trap_expected | |
5838 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5839 | stopped_by_watchpoint = 0; |
5840 | else | |
5841 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5842 | ||
5843 | /* If necessary, step over this watchpoint. We'll be back to display | |
5844 | it in a moment. */ | |
5845 | if (stopped_by_watchpoint | |
d92524f1 | 5846 | && (target_have_steppable_watchpoint |
568d6575 | 5847 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5848 | { |
488f131b JB |
5849 | /* At this point, we are stopped at an instruction which has |
5850 | attempted to write to a piece of memory under control of | |
5851 | a watchpoint. The instruction hasn't actually executed | |
5852 | yet. If we were to evaluate the watchpoint expression | |
5853 | now, we would get the old value, and therefore no change | |
5854 | would seem to have occurred. | |
5855 | ||
5856 | In order to make watchpoints work `right', we really need | |
5857 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5858 | watchpoint expression. We do this by single-stepping the |
5859 | target. | |
5860 | ||
7f89fd65 | 5861 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5862 | it. For example, the PA can (with some kernel cooperation) |
5863 | single step over a watchpoint without disabling the watchpoint. | |
5864 | ||
5865 | It is far more common to need to disable a watchpoint to step | |
5866 | the inferior over it. If we have non-steppable watchpoints, | |
5867 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5868 | disable all watchpoints. |
5869 | ||
5870 | Any breakpoint at PC must also be stepped over -- if there's | |
5871 | one, it will have already triggered before the watchpoint | |
5872 | triggered, and we either already reported it to the user, or | |
5873 | it didn't cause a stop and we called keep_going. In either | |
5874 | case, if there was a breakpoint at PC, we must be trying to | |
5875 | step past it. */ | |
5876 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5877 | keep_going (ecs); | |
488f131b JB |
5878 | return; |
5879 | } | |
5880 | ||
4e1c45ea | 5881 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5882 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5883 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5884 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5885 | stop_print_frame = 1; |
488f131b | 5886 | stopped_by_random_signal = 0; |
488f131b | 5887 | |
edb3359d DJ |
5888 | /* Hide inlined functions starting here, unless we just performed stepi or |
5889 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5890 | inline function call sites). */ | |
16c381f0 | 5891 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f GB |
5892 | { |
5893 | struct address_space *aspace = | |
5894 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
5895 | ||
5896 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5897 | determine that the address is one where functions cannot have | |
5898 | been inlined. This improves performance with inferiors that | |
5899 | load a lot of shared libraries, because the solib event | |
5900 | breakpoint is defined as the address of a function (i.e. not | |
5901 | inline). Note that we have to check the previous PC as well | |
5902 | as the current one to catch cases when we have just | |
5903 | single-stepped off a breakpoint prior to reinstating it. | |
5904 | Note that we're assuming that the code we single-step to is | |
5905 | not inline, but that's not definitive: there's nothing | |
5906 | preventing the event breakpoint function from containing | |
5907 | inlined code, and the single-step ending up there. If the | |
5908 | user had set a breakpoint on that inlined code, the missing | |
5909 | skip_inline_frames call would break things. Fortunately | |
5910 | that's an extremely unlikely scenario. */ | |
09ac7c10 | 5911 | if (!pc_at_non_inline_function (aspace, stop_pc, &ecs->ws) |
a210c238 MR |
5912 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5913 | && ecs->event_thread->control.trap_expected | |
5914 | && pc_at_non_inline_function (aspace, | |
5915 | ecs->event_thread->prev_pc, | |
09ac7c10 | 5916 | &ecs->ws))) |
1c5a993e MR |
5917 | { |
5918 | skip_inline_frames (ecs->ptid); | |
5919 | ||
5920 | /* Re-fetch current thread's frame in case that invalidated | |
5921 | the frame cache. */ | |
5922 | frame = get_current_frame (); | |
5923 | gdbarch = get_frame_arch (frame); | |
5924 | } | |
0574c78f | 5925 | } |
edb3359d | 5926 | |
a493e3e2 | 5927 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 5928 | && ecs->event_thread->control.trap_expected |
568d6575 | 5929 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 5930 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 5931 | { |
b50d7442 | 5932 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 5933 | also on an instruction that needs to be stepped multiple |
1777feb0 | 5934 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
5935 | with a delay slot. It needs to be stepped twice, once for |
5936 | the instruction and once for the delay slot. */ | |
5937 | int step_through_delay | |
568d6575 | 5938 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 5939 | |
527159b7 | 5940 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 5941 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
5942 | if (ecs->event_thread->control.step_range_end == 0 |
5943 | && step_through_delay) | |
3352ef37 AC |
5944 | { |
5945 | /* The user issued a continue when stopped at a breakpoint. | |
5946 | Set up for another trap and get out of here. */ | |
4e1c45ea | 5947 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5948 | keep_going (ecs); |
5949 | return; | |
5950 | } | |
5951 | else if (step_through_delay) | |
5952 | { | |
5953 | /* The user issued a step when stopped at a breakpoint. | |
5954 | Maybe we should stop, maybe we should not - the delay | |
5955 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
5956 | case, don't decide that here, just set |
5957 | ecs->stepping_over_breakpoint, making sure we | |
5958 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 5959 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5960 | } |
5961 | } | |
5962 | ||
ab04a2af TT |
5963 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
5964 | handles this event. */ | |
5965 | ecs->event_thread->control.stop_bpstat | |
5966 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
5967 | stop_pc, ecs->ptid, &ecs->ws); | |
db82e815 | 5968 | |
ab04a2af TT |
5969 | /* Following in case break condition called a |
5970 | function. */ | |
5971 | stop_print_frame = 1; | |
73dd234f | 5972 | |
ab04a2af TT |
5973 | /* This is where we handle "moribund" watchpoints. Unlike |
5974 | software breakpoints traps, hardware watchpoint traps are | |
5975 | always distinguishable from random traps. If no high-level | |
5976 | watchpoint is associated with the reported stop data address | |
5977 | anymore, then the bpstat does not explain the signal --- | |
5978 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
5979 | set. */ | |
5980 | ||
5981 | if (debug_infrun | |
5982 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 5983 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 5984 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
5985 | && stopped_by_watchpoint) |
5986 | fprintf_unfiltered (gdb_stdlog, | |
5987 | "infrun: no user watchpoint explains " | |
5988 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 5989 | |
bac7d97b | 5990 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
5991 | at one stage in the past included checks for an inferior |
5992 | function call's call dummy's return breakpoint. The original | |
5993 | comment, that went with the test, read: | |
03cebad2 | 5994 | |
ab04a2af TT |
5995 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
5996 | another signal besides SIGTRAP, so check here as well as | |
5997 | above.'' | |
73dd234f | 5998 | |
ab04a2af TT |
5999 | If someone ever tries to get call dummys on a |
6000 | non-executable stack to work (where the target would stop | |
6001 | with something like a SIGSEGV), then those tests might need | |
6002 | to be re-instated. Given, however, that the tests were only | |
6003 | enabled when momentary breakpoints were not being used, I | |
6004 | suspect that it won't be the case. | |
488f131b | 6005 | |
ab04a2af TT |
6006 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6007 | be necessary for call dummies on a non-executable stack on | |
6008 | SPARC. */ | |
488f131b | 6009 | |
bac7d97b | 6010 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6011 | random_signal |
6012 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
6013 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 6014 | |
1cf4d951 PA |
6015 | /* Maybe this was a trap for a software breakpoint that has since |
6016 | been removed. */ | |
6017 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6018 | { | |
6019 | if (program_breakpoint_here_p (gdbarch, stop_pc)) | |
6020 | { | |
6021 | struct regcache *regcache; | |
6022 | int decr_pc; | |
6023 | ||
6024 | /* Re-adjust PC to what the program would see if GDB was not | |
6025 | debugging it. */ | |
6026 | regcache = get_thread_regcache (ecs->event_thread->ptid); | |
527a273a | 6027 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6028 | if (decr_pc != 0) |
6029 | { | |
6030 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); | |
6031 | ||
6032 | if (record_full_is_used ()) | |
6033 | record_full_gdb_operation_disable_set (); | |
6034 | ||
6035 | regcache_write_pc (regcache, stop_pc + decr_pc); | |
6036 | ||
6037 | do_cleanups (old_cleanups); | |
6038 | } | |
6039 | } | |
6040 | else | |
6041 | { | |
6042 | /* A delayed software breakpoint event. Ignore the trap. */ | |
6043 | if (debug_infrun) | |
6044 | fprintf_unfiltered (gdb_stdlog, | |
6045 | "infrun: delayed software breakpoint " | |
6046 | "trap, ignoring\n"); | |
6047 | random_signal = 0; | |
6048 | } | |
6049 | } | |
6050 | ||
6051 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6052 | has since been removed. */ | |
6053 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6054 | { | |
6055 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
6056 | if (debug_infrun) | |
6057 | fprintf_unfiltered (gdb_stdlog, | |
6058 | "infrun: delayed hardware breakpoint/watchpoint " | |
6059 | "trap, ignoring\n"); | |
6060 | random_signal = 0; | |
6061 | } | |
6062 | ||
bac7d97b PA |
6063 | /* If not, perhaps stepping/nexting can. */ |
6064 | if (random_signal) | |
6065 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6066 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6067 | |
2adfaa28 PA |
6068 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6069 | thread. Single-step breakpoints are transparent to the | |
6070 | breakpoints module. */ | |
6071 | if (random_signal) | |
6072 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6073 | ||
bac7d97b PA |
6074 | /* No? Perhaps we got a moribund watchpoint. */ |
6075 | if (random_signal) | |
6076 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6077 | |
c65d6b55 PA |
6078 | /* Always stop if the user explicitly requested this thread to |
6079 | remain stopped. */ | |
6080 | if (ecs->event_thread->stop_requested) | |
6081 | { | |
6082 | random_signal = 1; | |
6083 | if (debug_infrun) | |
6084 | fprintf_unfiltered (gdb_stdlog, "infrun: user-requested stop\n"); | |
6085 | } | |
6086 | ||
488f131b JB |
6087 | /* For the program's own signals, act according to |
6088 | the signal handling tables. */ | |
6089 | ||
ce12b012 | 6090 | if (random_signal) |
488f131b JB |
6091 | { |
6092 | /* Signal not for debugging purposes. */ | |
c9657e70 | 6093 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
c9737c08 | 6094 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6095 | |
527159b7 | 6096 | if (debug_infrun) |
c9737c08 PA |
6097 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
6098 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6099 | |
488f131b JB |
6100 | stopped_by_random_signal = 1; |
6101 | ||
252fbfc8 PA |
6102 | /* Always stop on signals if we're either just gaining control |
6103 | of the program, or the user explicitly requested this thread | |
6104 | to remain stopped. */ | |
d6b48e9c | 6105 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6106 | || ecs->event_thread->stop_requested |
24291992 | 6107 | || (!inf->detaching |
16c381f0 | 6108 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 6109 | { |
22bcd14b | 6110 | stop_waiting (ecs); |
488f131b JB |
6111 | return; |
6112 | } | |
b57bacec PA |
6113 | |
6114 | /* Notify observers the signal has "handle print" set. Note we | |
6115 | returned early above if stopping; normal_stop handles the | |
6116 | printing in that case. */ | |
6117 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6118 | { | |
6119 | /* The signal table tells us to print about this signal. */ | |
6120 | target_terminal_ours_for_output (); | |
6121 | observer_notify_signal_received (ecs->event_thread->suspend.stop_signal); | |
6122 | target_terminal_inferior (); | |
6123 | } | |
488f131b JB |
6124 | |
6125 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6126 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6127 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6128 | |
fb14de7b | 6129 | if (ecs->event_thread->prev_pc == stop_pc |
16c381f0 | 6130 | && ecs->event_thread->control.trap_expected |
8358c15c | 6131 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6132 | { |
6133 | /* We were just starting a new sequence, attempting to | |
6134 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6135 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6136 | of the stepping range so GDB needs to remember to, when |
6137 | the signal handler returns, resume stepping off that | |
6138 | breakpoint. */ | |
6139 | /* To simplify things, "continue" is forced to use the same | |
6140 | code paths as single-step - set a breakpoint at the | |
6141 | signal return address and then, once hit, step off that | |
6142 | breakpoint. */ | |
237fc4c9 PA |
6143 | if (debug_infrun) |
6144 | fprintf_unfiltered (gdb_stdlog, | |
6145 | "infrun: signal arrived while stepping over " | |
6146 | "breakpoint\n"); | |
d3169d93 | 6147 | |
2c03e5be | 6148 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6149 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6150 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6151 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6152 | |
6153 | /* If we were nexting/stepping some other thread, switch to | |
6154 | it, so that we don't continue it, losing control. */ | |
6155 | if (!switch_back_to_stepped_thread (ecs)) | |
6156 | keep_going (ecs); | |
9d799f85 | 6157 | return; |
68f53502 | 6158 | } |
9d799f85 | 6159 | |
e5f8a7cc PA |
6160 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
6161 | && (pc_in_thread_step_range (stop_pc, ecs->event_thread) | |
6162 | || ecs->event_thread->control.step_range_end == 1) | |
edb3359d | 6163 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6164 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6165 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6166 | { |
6167 | /* The inferior is about to take a signal that will take it | |
6168 | out of the single step range. Set a breakpoint at the | |
6169 | current PC (which is presumably where the signal handler | |
6170 | will eventually return) and then allow the inferior to | |
6171 | run free. | |
6172 | ||
6173 | Note that this is only needed for a signal delivered | |
6174 | while in the single-step range. Nested signals aren't a | |
6175 | problem as they eventually all return. */ | |
237fc4c9 PA |
6176 | if (debug_infrun) |
6177 | fprintf_unfiltered (gdb_stdlog, | |
6178 | "infrun: signal may take us out of " | |
6179 | "single-step range\n"); | |
6180 | ||
372316f1 | 6181 | clear_step_over_info (); |
2c03e5be | 6182 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6183 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6184 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6185 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6186 | keep_going (ecs); |
6187 | return; | |
d303a6c7 | 6188 | } |
9d799f85 AC |
6189 | |
6190 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
6191 | when either there's a nested signal, or when there's a | |
6192 | pending signal enabled just as the signal handler returns | |
6193 | (leaving the inferior at the step-resume-breakpoint without | |
6194 | actually executing it). Either way continue until the | |
6195 | breakpoint is really hit. */ | |
c447ac0b PA |
6196 | |
6197 | if (!switch_back_to_stepped_thread (ecs)) | |
6198 | { | |
6199 | if (debug_infrun) | |
6200 | fprintf_unfiltered (gdb_stdlog, | |
6201 | "infrun: random signal, keep going\n"); | |
6202 | ||
6203 | keep_going (ecs); | |
6204 | } | |
6205 | return; | |
488f131b | 6206 | } |
94c57d6a PA |
6207 | |
6208 | process_event_stop_test (ecs); | |
6209 | } | |
6210 | ||
6211 | /* Come here when we've got some debug event / signal we can explain | |
6212 | (IOW, not a random signal), and test whether it should cause a | |
6213 | stop, or whether we should resume the inferior (transparently). | |
6214 | E.g., could be a breakpoint whose condition evaluates false; we | |
6215 | could be still stepping within the line; etc. */ | |
6216 | ||
6217 | static void | |
6218 | process_event_stop_test (struct execution_control_state *ecs) | |
6219 | { | |
6220 | struct symtab_and_line stop_pc_sal; | |
6221 | struct frame_info *frame; | |
6222 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6223 | CORE_ADDR jmp_buf_pc; |
6224 | struct bpstat_what what; | |
94c57d6a | 6225 | |
cdaa5b73 | 6226 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6227 | |
cdaa5b73 PA |
6228 | frame = get_current_frame (); |
6229 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6230 | |
cdaa5b73 | 6231 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6232 | |
cdaa5b73 PA |
6233 | if (what.call_dummy) |
6234 | { | |
6235 | stop_stack_dummy = what.call_dummy; | |
6236 | } | |
186c406b | 6237 | |
243a9253 PA |
6238 | /* A few breakpoint types have callbacks associated (e.g., |
6239 | bp_jit_event). Run them now. */ | |
6240 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6241 | ||
cdaa5b73 PA |
6242 | /* If we hit an internal event that triggers symbol changes, the |
6243 | current frame will be invalidated within bpstat_what (e.g., if we | |
6244 | hit an internal solib event). Re-fetch it. */ | |
6245 | frame = get_current_frame (); | |
6246 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6247 | |
cdaa5b73 PA |
6248 | switch (what.main_action) |
6249 | { | |
6250 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6251 | /* If we hit the breakpoint at longjmp while stepping, we | |
6252 | install a momentary breakpoint at the target of the | |
6253 | jmp_buf. */ | |
186c406b | 6254 | |
cdaa5b73 PA |
6255 | if (debug_infrun) |
6256 | fprintf_unfiltered (gdb_stdlog, | |
6257 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 6258 | |
cdaa5b73 | 6259 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6260 | |
cdaa5b73 PA |
6261 | if (what.is_longjmp) |
6262 | { | |
6263 | struct value *arg_value; | |
6264 | ||
6265 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6266 | then use it to extract the arguments. The destination PC | |
6267 | is the third argument to the probe. */ | |
6268 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6269 | if (arg_value) | |
8fa0c4f8 AA |
6270 | { |
6271 | jmp_buf_pc = value_as_address (arg_value); | |
6272 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6273 | } | |
cdaa5b73 PA |
6274 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6275 | || !gdbarch_get_longjmp_target (gdbarch, | |
6276 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6277 | { |
cdaa5b73 PA |
6278 | if (debug_infrun) |
6279 | fprintf_unfiltered (gdb_stdlog, | |
6280 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
6281 | "(!gdbarch_get_longjmp_target)\n"); | |
6282 | keep_going (ecs); | |
6283 | return; | |
e2e4d78b | 6284 | } |
e2e4d78b | 6285 | |
cdaa5b73 PA |
6286 | /* Insert a breakpoint at resume address. */ |
6287 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6288 | } | |
6289 | else | |
6290 | check_exception_resume (ecs, frame); | |
6291 | keep_going (ecs); | |
6292 | return; | |
e81a37f7 | 6293 | |
cdaa5b73 PA |
6294 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6295 | { | |
6296 | struct frame_info *init_frame; | |
e81a37f7 | 6297 | |
cdaa5b73 | 6298 | /* There are several cases to consider. |
c906108c | 6299 | |
cdaa5b73 PA |
6300 | 1. The initiating frame no longer exists. In this case we |
6301 | must stop, because the exception or longjmp has gone too | |
6302 | far. | |
2c03e5be | 6303 | |
cdaa5b73 PA |
6304 | 2. The initiating frame exists, and is the same as the |
6305 | current frame. We stop, because the exception or longjmp | |
6306 | has been caught. | |
2c03e5be | 6307 | |
cdaa5b73 PA |
6308 | 3. The initiating frame exists and is different from the |
6309 | current frame. This means the exception or longjmp has | |
6310 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6311 | |
cdaa5b73 PA |
6312 | 4. longjmp breakpoint has been placed just to protect |
6313 | against stale dummy frames and user is not interested in | |
6314 | stopping around longjmps. */ | |
c5aa993b | 6315 | |
cdaa5b73 PA |
6316 | if (debug_infrun) |
6317 | fprintf_unfiltered (gdb_stdlog, | |
6318 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 6319 | |
cdaa5b73 PA |
6320 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6321 | != NULL); | |
6322 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6323 | |
cdaa5b73 PA |
6324 | if (what.is_longjmp) |
6325 | { | |
b67a2c6f | 6326 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6327 | |
cdaa5b73 | 6328 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6329 | { |
cdaa5b73 PA |
6330 | /* Case 4. */ |
6331 | keep_going (ecs); | |
6332 | return; | |
e5ef252a | 6333 | } |
cdaa5b73 | 6334 | } |
c5aa993b | 6335 | |
cdaa5b73 | 6336 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6337 | |
cdaa5b73 PA |
6338 | if (init_frame) |
6339 | { | |
6340 | struct frame_id current_id | |
6341 | = get_frame_id (get_current_frame ()); | |
6342 | if (frame_id_eq (current_id, | |
6343 | ecs->event_thread->initiating_frame)) | |
6344 | { | |
6345 | /* Case 2. Fall through. */ | |
6346 | } | |
6347 | else | |
6348 | { | |
6349 | /* Case 3. */ | |
6350 | keep_going (ecs); | |
6351 | return; | |
6352 | } | |
68f53502 | 6353 | } |
488f131b | 6354 | |
cdaa5b73 PA |
6355 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6356 | exists. */ | |
6357 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6358 | |
bdc36728 | 6359 | end_stepping_range (ecs); |
cdaa5b73 PA |
6360 | } |
6361 | return; | |
e5ef252a | 6362 | |
cdaa5b73 PA |
6363 | case BPSTAT_WHAT_SINGLE: |
6364 | if (debug_infrun) | |
6365 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
6366 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6367 | /* Still need to check other stuff, at least the case where we | |
6368 | are stepping and step out of the right range. */ | |
6369 | break; | |
e5ef252a | 6370 | |
cdaa5b73 PA |
6371 | case BPSTAT_WHAT_STEP_RESUME: |
6372 | if (debug_infrun) | |
6373 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 6374 | |
cdaa5b73 PA |
6375 | delete_step_resume_breakpoint (ecs->event_thread); |
6376 | if (ecs->event_thread->control.proceed_to_finish | |
6377 | && execution_direction == EXEC_REVERSE) | |
6378 | { | |
6379 | struct thread_info *tp = ecs->event_thread; | |
6380 | ||
6381 | /* We are finishing a function in reverse, and just hit the | |
6382 | step-resume breakpoint at the start address of the | |
6383 | function, and we're almost there -- just need to back up | |
6384 | by one more single-step, which should take us back to the | |
6385 | function call. */ | |
6386 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6387 | keep_going (ecs); | |
e5ef252a | 6388 | return; |
cdaa5b73 PA |
6389 | } |
6390 | fill_in_stop_func (gdbarch, ecs); | |
6391 | if (stop_pc == ecs->stop_func_start | |
6392 | && execution_direction == EXEC_REVERSE) | |
6393 | { | |
6394 | /* We are stepping over a function call in reverse, and just | |
6395 | hit the step-resume breakpoint at the start address of | |
6396 | the function. Go back to single-stepping, which should | |
6397 | take us back to the function call. */ | |
6398 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6399 | keep_going (ecs); | |
6400 | return; | |
6401 | } | |
6402 | break; | |
e5ef252a | 6403 | |
cdaa5b73 PA |
6404 | case BPSTAT_WHAT_STOP_NOISY: |
6405 | if (debug_infrun) | |
6406 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
6407 | stop_print_frame = 1; | |
e5ef252a | 6408 | |
99619bea PA |
6409 | /* Assume the thread stopped for a breapoint. We'll still check |
6410 | whether a/the breakpoint is there when the thread is next | |
6411 | resumed. */ | |
6412 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6413 | |
22bcd14b | 6414 | stop_waiting (ecs); |
cdaa5b73 | 6415 | return; |
e5ef252a | 6416 | |
cdaa5b73 PA |
6417 | case BPSTAT_WHAT_STOP_SILENT: |
6418 | if (debug_infrun) | |
6419 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
6420 | stop_print_frame = 0; | |
e5ef252a | 6421 | |
99619bea PA |
6422 | /* Assume the thread stopped for a breapoint. We'll still check |
6423 | whether a/the breakpoint is there when the thread is next | |
6424 | resumed. */ | |
6425 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6426 | stop_waiting (ecs); |
cdaa5b73 PA |
6427 | return; |
6428 | ||
6429 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
6430 | if (debug_infrun) | |
6431 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
6432 | ||
6433 | delete_step_resume_breakpoint (ecs->event_thread); | |
6434 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6435 | { | |
6436 | /* Back when the step-resume breakpoint was inserted, we | |
6437 | were trying to single-step off a breakpoint. Go back to | |
6438 | doing that. */ | |
6439 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6440 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6441 | keep_going (ecs); | |
6442 | return; | |
e5ef252a | 6443 | } |
cdaa5b73 PA |
6444 | break; |
6445 | ||
6446 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6447 | break; | |
e5ef252a | 6448 | } |
c906108c | 6449 | |
af48d08f PA |
6450 | /* If we stepped a permanent breakpoint and we had a high priority |
6451 | step-resume breakpoint for the address we stepped, but we didn't | |
6452 | hit it, then we must have stepped into the signal handler. The | |
6453 | step-resume was only necessary to catch the case of _not_ | |
6454 | stepping into the handler, so delete it, and fall through to | |
6455 | checking whether the step finished. */ | |
6456 | if (ecs->event_thread->stepped_breakpoint) | |
6457 | { | |
6458 | struct breakpoint *sr_bp | |
6459 | = ecs->event_thread->control.step_resume_breakpoint; | |
6460 | ||
8d707a12 PA |
6461 | if (sr_bp != NULL |
6462 | && sr_bp->loc->permanent | |
af48d08f PA |
6463 | && sr_bp->type == bp_hp_step_resume |
6464 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6465 | { | |
6466 | if (debug_infrun) | |
6467 | fprintf_unfiltered (gdb_stdlog, | |
6468 | "infrun: stepped permanent breakpoint, stopped in " | |
6469 | "handler\n"); | |
6470 | delete_step_resume_breakpoint (ecs->event_thread); | |
6471 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6472 | } | |
6473 | } | |
6474 | ||
cdaa5b73 PA |
6475 | /* We come here if we hit a breakpoint but should not stop for it. |
6476 | Possibly we also were stepping and should stop for that. So fall | |
6477 | through and test for stepping. But, if not stepping, do not | |
6478 | stop. */ | |
c906108c | 6479 | |
a7212384 UW |
6480 | /* In all-stop mode, if we're currently stepping but have stopped in |
6481 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6482 | if (switch_back_to_stepped_thread (ecs)) |
6483 | return; | |
776f04fa | 6484 | |
8358c15c | 6485 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6486 | { |
527159b7 | 6487 | if (debug_infrun) |
d3169d93 DJ |
6488 | fprintf_unfiltered (gdb_stdlog, |
6489 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 6490 | |
488f131b JB |
6491 | /* Having a step-resume breakpoint overrides anything |
6492 | else having to do with stepping commands until | |
6493 | that breakpoint is reached. */ | |
488f131b JB |
6494 | keep_going (ecs); |
6495 | return; | |
6496 | } | |
c5aa993b | 6497 | |
16c381f0 | 6498 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6499 | { |
527159b7 | 6500 | if (debug_infrun) |
8a9de0e4 | 6501 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 6502 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6503 | keep_going (ecs); |
6504 | return; | |
6505 | } | |
c5aa993b | 6506 | |
4b7703ad JB |
6507 | /* Re-fetch current thread's frame in case the code above caused |
6508 | the frame cache to be re-initialized, making our FRAME variable | |
6509 | a dangling pointer. */ | |
6510 | frame = get_current_frame (); | |
628fe4e4 | 6511 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6512 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6513 | |
488f131b | 6514 | /* If stepping through a line, keep going if still within it. |
c906108c | 6515 | |
488f131b JB |
6516 | Note that step_range_end is the address of the first instruction |
6517 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6518 | within it! |
6519 | ||
6520 | Note also that during reverse execution, we may be stepping | |
6521 | through a function epilogue and therefore must detect when | |
6522 | the current-frame changes in the middle of a line. */ | |
6523 | ||
ce4c476a | 6524 | if (pc_in_thread_step_range (stop_pc, ecs->event_thread) |
31410e84 | 6525 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6526 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6527 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6528 | { |
527159b7 | 6529 | if (debug_infrun) |
5af949e3 UW |
6530 | fprintf_unfiltered |
6531 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
6532 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
6533 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6534 | |
c1e36e3e PA |
6535 | /* Tentatively re-enable range stepping; `resume' disables it if |
6536 | necessary (e.g., if we're stepping over a breakpoint or we | |
6537 | have software watchpoints). */ | |
6538 | ecs->event_thread->control.may_range_step = 1; | |
6539 | ||
b2175913 MS |
6540 | /* When stepping backward, stop at beginning of line range |
6541 | (unless it's the function entry point, in which case | |
6542 | keep going back to the call point). */ | |
16c381f0 | 6543 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6544 | && stop_pc != ecs->stop_func_start |
6545 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6546 | end_stepping_range (ecs); |
b2175913 MS |
6547 | else |
6548 | keep_going (ecs); | |
6549 | ||
488f131b JB |
6550 | return; |
6551 | } | |
c5aa993b | 6552 | |
488f131b | 6553 | /* We stepped out of the stepping range. */ |
c906108c | 6554 | |
488f131b | 6555 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6556 | loader dynamic symbol resolution code... |
6557 | ||
6558 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6559 | time loader code and reach the callee's address. | |
6560 | ||
6561 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6562 | the runtime loader code is handled just like any other | |
6563 | undebuggable function call. Now we need only keep stepping | |
6564 | backward through the trampoline code, and that's handled further | |
6565 | down, so there is nothing for us to do here. */ | |
6566 | ||
6567 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6568 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
cfd8ab24 | 6569 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 6570 | { |
4c8c40e6 | 6571 | CORE_ADDR pc_after_resolver = |
568d6575 | 6572 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); |
c906108c | 6573 | |
527159b7 | 6574 | if (debug_infrun) |
3e43a32a MS |
6575 | fprintf_unfiltered (gdb_stdlog, |
6576 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 6577 | |
488f131b JB |
6578 | if (pc_after_resolver) |
6579 | { | |
6580 | /* Set up a step-resume breakpoint at the address | |
6581 | indicated by SKIP_SOLIB_RESOLVER. */ | |
6582 | struct symtab_and_line sr_sal; | |
abbb1732 | 6583 | |
fe39c653 | 6584 | init_sal (&sr_sal); |
488f131b | 6585 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6586 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6587 | |
a6d9a66e UW |
6588 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6589 | sr_sal, null_frame_id); | |
c5aa993b | 6590 | } |
c906108c | 6591 | |
488f131b JB |
6592 | keep_going (ecs); |
6593 | return; | |
6594 | } | |
c906108c | 6595 | |
16c381f0 JK |
6596 | if (ecs->event_thread->control.step_range_end != 1 |
6597 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6598 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6599 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6600 | { |
527159b7 | 6601 | if (debug_infrun) |
3e43a32a MS |
6602 | fprintf_unfiltered (gdb_stdlog, |
6603 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 6604 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6605 | a signal trampoline (either by a signal being delivered or by |
6606 | the signal handler returning). Just single-step until the | |
6607 | inferior leaves the trampoline (either by calling the handler | |
6608 | or returning). */ | |
488f131b JB |
6609 | keep_going (ecs); |
6610 | return; | |
6611 | } | |
c906108c | 6612 | |
14132e89 MR |
6613 | /* If we're in the return path from a shared library trampoline, |
6614 | we want to proceed through the trampoline when stepping. */ | |
6615 | /* macro/2012-04-25: This needs to come before the subroutine | |
6616 | call check below as on some targets return trampolines look | |
6617 | like subroutine calls (MIPS16 return thunks). */ | |
6618 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
6619 | stop_pc, ecs->stop_func_name) | |
6620 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) | |
6621 | { | |
6622 | /* Determine where this trampoline returns. */ | |
6623 | CORE_ADDR real_stop_pc; | |
6624 | ||
6625 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
6626 | ||
6627 | if (debug_infrun) | |
6628 | fprintf_unfiltered (gdb_stdlog, | |
6629 | "infrun: stepped into solib return tramp\n"); | |
6630 | ||
6631 | /* Only proceed through if we know where it's going. */ | |
6632 | if (real_stop_pc) | |
6633 | { | |
6634 | /* And put the step-breakpoint there and go until there. */ | |
6635 | struct symtab_and_line sr_sal; | |
6636 | ||
6637 | init_sal (&sr_sal); /* initialize to zeroes */ | |
6638 | sr_sal.pc = real_stop_pc; | |
6639 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6640 | sr_sal.pspace = get_frame_program_space (frame); | |
6641 | ||
6642 | /* Do not specify what the fp should be when we stop since | |
6643 | on some machines the prologue is where the new fp value | |
6644 | is established. */ | |
6645 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6646 | sr_sal, null_frame_id); | |
6647 | ||
6648 | /* Restart without fiddling with the step ranges or | |
6649 | other state. */ | |
6650 | keep_going (ecs); | |
6651 | return; | |
6652 | } | |
6653 | } | |
6654 | ||
c17eaafe DJ |
6655 | /* Check for subroutine calls. The check for the current frame |
6656 | equalling the step ID is not necessary - the check of the | |
6657 | previous frame's ID is sufficient - but it is a common case and | |
6658 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6659 | |
6660 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6661 | being equal, so to get into this block, both the current and | |
6662 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6663 | /* The outer_frame_id check is a heuristic to detect stepping |
6664 | through startup code. If we step over an instruction which | |
6665 | sets the stack pointer from an invalid value to a valid value, | |
6666 | we may detect that as a subroutine call from the mythical | |
6667 | "outermost" function. This could be fixed by marking | |
6668 | outermost frames as !stack_p,code_p,special_p. Then the | |
6669 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6670 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6671 | for more. */ |
edb3359d | 6672 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6673 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6674 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6675 | ecs->event_thread->control.step_stack_frame_id) |
6676 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6677 | outer_frame_id) |
885eeb5b PA |
6678 | || (ecs->event_thread->control.step_start_function |
6679 | != find_pc_function (stop_pc))))) | |
488f131b | 6680 | { |
95918acb | 6681 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6682 | |
527159b7 | 6683 | if (debug_infrun) |
8a9de0e4 | 6684 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 6685 | |
b7a084be | 6686 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6687 | { |
6688 | /* I presume that step_over_calls is only 0 when we're | |
6689 | supposed to be stepping at the assembly language level | |
6690 | ("stepi"). Just stop. */ | |
388a8562 | 6691 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6692 | end_stepping_range (ecs); |
95918acb AC |
6693 | return; |
6694 | } | |
8fb3e588 | 6695 | |
388a8562 MS |
6696 | /* Reverse stepping through solib trampolines. */ |
6697 | ||
6698 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6699 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6700 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6701 | || (ecs->stop_func_start == 0 | |
6702 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6703 | { | |
6704 | /* Any solib trampoline code can be handled in reverse | |
6705 | by simply continuing to single-step. We have already | |
6706 | executed the solib function (backwards), and a few | |
6707 | steps will take us back through the trampoline to the | |
6708 | caller. */ | |
6709 | keep_going (ecs); | |
6710 | return; | |
6711 | } | |
6712 | ||
16c381f0 | 6713 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6714 | { |
b2175913 MS |
6715 | /* We're doing a "next". |
6716 | ||
6717 | Normal (forward) execution: set a breakpoint at the | |
6718 | callee's return address (the address at which the caller | |
6719 | will resume). | |
6720 | ||
6721 | Reverse (backward) execution. set the step-resume | |
6722 | breakpoint at the start of the function that we just | |
6723 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6724 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6725 | |
6726 | if (execution_direction == EXEC_REVERSE) | |
6727 | { | |
acf9414f JK |
6728 | /* If we're already at the start of the function, we've either |
6729 | just stepped backward into a single instruction function, | |
6730 | or stepped back out of a signal handler to the first instruction | |
6731 | of the function. Just keep going, which will single-step back | |
6732 | to the caller. */ | |
58c48e72 | 6733 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f JK |
6734 | { |
6735 | struct symtab_and_line sr_sal; | |
6736 | ||
6737 | /* Normal function call return (static or dynamic). */ | |
6738 | init_sal (&sr_sal); | |
6739 | sr_sal.pc = ecs->stop_func_start; | |
6740 | sr_sal.pspace = get_frame_program_space (frame); | |
6741 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6742 | sr_sal, null_frame_id); | |
6743 | } | |
b2175913 MS |
6744 | } |
6745 | else | |
568d6575 | 6746 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6747 | |
8567c30f AC |
6748 | keep_going (ecs); |
6749 | return; | |
6750 | } | |
a53c66de | 6751 | |
95918acb | 6752 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6753 | calling routine and the real function), locate the real |
6754 | function. That's what tells us (a) whether we want to step | |
6755 | into it at all, and (b) what prologue we want to run to the | |
6756 | end of, if we do step into it. */ | |
568d6575 | 6757 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6758 | if (real_stop_pc == 0) |
568d6575 | 6759 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6760 | if (real_stop_pc != 0) |
6761 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6762 | |
db5f024e | 6763 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 RC |
6764 | { |
6765 | struct symtab_and_line sr_sal; | |
abbb1732 | 6766 | |
1b2bfbb9 RC |
6767 | init_sal (&sr_sal); |
6768 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 6769 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6770 | |
a6d9a66e UW |
6771 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6772 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6773 | keep_going (ecs); |
6774 | return; | |
1b2bfbb9 RC |
6775 | } |
6776 | ||
95918acb | 6777 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6778 | thinking of stepping into and the function isn't on the skip |
6779 | list, step into it. | |
95918acb | 6780 | |
8fb3e588 AC |
6781 | If there are several symtabs at that PC (e.g. with include |
6782 | files), just want to know whether *any* of them have line | |
6783 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6784 | { |
6785 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6786 | |
95918acb | 6787 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6788 | if (tmp_sal.line != 0 |
85817405 JK |
6789 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
6790 | &tmp_sal)) | |
95918acb | 6791 | { |
b2175913 | 6792 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6793 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6794 | else |
568d6575 | 6795 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6796 | return; |
6797 | } | |
6798 | } | |
6799 | ||
6800 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6801 | set, we stop the step so that the user has a chance to switch |
6802 | in assembly mode. */ | |
16c381f0 | 6803 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6804 | && step_stop_if_no_debug) |
95918acb | 6805 | { |
bdc36728 | 6806 | end_stepping_range (ecs); |
95918acb AC |
6807 | return; |
6808 | } | |
6809 | ||
b2175913 MS |
6810 | if (execution_direction == EXEC_REVERSE) |
6811 | { | |
acf9414f JK |
6812 | /* If we're already at the start of the function, we've either just |
6813 | stepped backward into a single instruction function without line | |
6814 | number info, or stepped back out of a signal handler to the first | |
6815 | instruction of the function without line number info. Just keep | |
6816 | going, which will single-step back to the caller. */ | |
6817 | if (ecs->stop_func_start != stop_pc) | |
6818 | { | |
6819 | /* Set a breakpoint at callee's start address. | |
6820 | From there we can step once and be back in the caller. */ | |
6821 | struct symtab_and_line sr_sal; | |
abbb1732 | 6822 | |
acf9414f JK |
6823 | init_sal (&sr_sal); |
6824 | sr_sal.pc = ecs->stop_func_start; | |
6825 | sr_sal.pspace = get_frame_program_space (frame); | |
6826 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6827 | sr_sal, null_frame_id); | |
6828 | } | |
b2175913 MS |
6829 | } |
6830 | else | |
6831 | /* Set a breakpoint at callee's return address (the address | |
6832 | at which the caller will resume). */ | |
568d6575 | 6833 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6834 | |
95918acb | 6835 | keep_going (ecs); |
488f131b | 6836 | return; |
488f131b | 6837 | } |
c906108c | 6838 | |
fdd654f3 MS |
6839 | /* Reverse stepping through solib trampolines. */ |
6840 | ||
6841 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6842 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 MS |
6843 | { |
6844 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
6845 | || (ecs->stop_func_start == 0 | |
6846 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6847 | { | |
6848 | /* Any solib trampoline code can be handled in reverse | |
6849 | by simply continuing to single-step. We have already | |
6850 | executed the solib function (backwards), and a few | |
6851 | steps will take us back through the trampoline to the | |
6852 | caller. */ | |
6853 | keep_going (ecs); | |
6854 | return; | |
6855 | } | |
6856 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6857 | { | |
6858 | /* Stepped backward into the solib dynsym resolver. | |
6859 | Set a breakpoint at its start and continue, then | |
6860 | one more step will take us out. */ | |
6861 | struct symtab_and_line sr_sal; | |
abbb1732 | 6862 | |
fdd654f3 MS |
6863 | init_sal (&sr_sal); |
6864 | sr_sal.pc = ecs->stop_func_start; | |
9d1807c3 | 6865 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6866 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6867 | sr_sal, null_frame_id); | |
6868 | keep_going (ecs); | |
6869 | return; | |
6870 | } | |
6871 | } | |
6872 | ||
2afb61aa | 6873 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 6874 | |
1b2bfbb9 RC |
6875 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6876 | the trampoline processing logic, however, there are some trampolines | |
6877 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6878 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6879 | && ecs->stop_func_name == NULL |
2afb61aa | 6880 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6881 | { |
527159b7 | 6882 | if (debug_infrun) |
3e43a32a MS |
6883 | fprintf_unfiltered (gdb_stdlog, |
6884 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 6885 | |
1b2bfbb9 | 6886 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6887 | undebuggable function (where there is no debugging information |
6888 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6889 | inferior stopped). Since we want to skip this kind of code, |
6890 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6891 | function - unless the user has asked us not to (via |
6892 | set step-mode) or we no longer know how to get back | |
6893 | to the call site. */ | |
6894 | if (step_stop_if_no_debug | |
c7ce8faa | 6895 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6896 | { |
6897 | /* If we have no line number and the step-stop-if-no-debug | |
6898 | is set, we stop the step so that the user has a chance to | |
6899 | switch in assembly mode. */ | |
bdc36728 | 6900 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6901 | return; |
6902 | } | |
6903 | else | |
6904 | { | |
6905 | /* Set a breakpoint at callee's return address (the address | |
6906 | at which the caller will resume). */ | |
568d6575 | 6907 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6908 | keep_going (ecs); |
6909 | return; | |
6910 | } | |
6911 | } | |
6912 | ||
16c381f0 | 6913 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6914 | { |
6915 | /* It is stepi or nexti. We always want to stop stepping after | |
6916 | one instruction. */ | |
527159b7 | 6917 | if (debug_infrun) |
8a9de0e4 | 6918 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 6919 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6920 | return; |
6921 | } | |
6922 | ||
2afb61aa | 6923 | if (stop_pc_sal.line == 0) |
488f131b JB |
6924 | { |
6925 | /* We have no line number information. That means to stop | |
6926 | stepping (does this always happen right after one instruction, | |
6927 | when we do "s" in a function with no line numbers, | |
6928 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 6929 | if (debug_infrun) |
8a9de0e4 | 6930 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 6931 | end_stepping_range (ecs); |
488f131b JB |
6932 | return; |
6933 | } | |
c906108c | 6934 | |
edb3359d DJ |
6935 | /* Look for "calls" to inlined functions, part one. If the inline |
6936 | frame machinery detected some skipped call sites, we have entered | |
6937 | a new inline function. */ | |
6938 | ||
6939 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6940 | ecs->event_thread->control.step_frame_id) |
edb3359d DJ |
6941 | && inline_skipped_frames (ecs->ptid)) |
6942 | { | |
6943 | struct symtab_and_line call_sal; | |
6944 | ||
6945 | if (debug_infrun) | |
6946 | fprintf_unfiltered (gdb_stdlog, | |
6947 | "infrun: stepped into inlined function\n"); | |
6948 | ||
6949 | find_frame_sal (get_current_frame (), &call_sal); | |
6950 | ||
16c381f0 | 6951 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
6952 | { |
6953 | /* For "step", we're going to stop. But if the call site | |
6954 | for this inlined function is on the same source line as | |
6955 | we were previously stepping, go down into the function | |
6956 | first. Otherwise stop at the call site. */ | |
6957 | ||
6958 | if (call_sal.line == ecs->event_thread->current_line | |
6959 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6960 | step_into_inline_frame (ecs->ptid); | |
6961 | ||
bdc36728 | 6962 | end_stepping_range (ecs); |
edb3359d DJ |
6963 | return; |
6964 | } | |
6965 | else | |
6966 | { | |
6967 | /* For "next", we should stop at the call site if it is on a | |
6968 | different source line. Otherwise continue through the | |
6969 | inlined function. */ | |
6970 | if (call_sal.line == ecs->event_thread->current_line | |
6971 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6972 | keep_going (ecs); | |
6973 | else | |
bdc36728 | 6974 | end_stepping_range (ecs); |
edb3359d DJ |
6975 | return; |
6976 | } | |
6977 | } | |
6978 | ||
6979 | /* Look for "calls" to inlined functions, part two. If we are still | |
6980 | in the same real function we were stepping through, but we have | |
6981 | to go further up to find the exact frame ID, we are stepping | |
6982 | through a more inlined call beyond its call site. */ | |
6983 | ||
6984 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
6985 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6986 | ecs->event_thread->control.step_frame_id) |
edb3359d | 6987 | && stepped_in_from (get_current_frame (), |
16c381f0 | 6988 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
6989 | { |
6990 | if (debug_infrun) | |
6991 | fprintf_unfiltered (gdb_stdlog, | |
6992 | "infrun: stepping through inlined function\n"); | |
6993 | ||
16c381f0 | 6994 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
6995 | keep_going (ecs); |
6996 | else | |
bdc36728 | 6997 | end_stepping_range (ecs); |
edb3359d DJ |
6998 | return; |
6999 | } | |
7000 | ||
2afb61aa | 7001 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
7002 | && (ecs->event_thread->current_line != stop_pc_sal.line |
7003 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
7004 | { |
7005 | /* We are at the start of a different line. So stop. Note that | |
7006 | we don't stop if we step into the middle of a different line. | |
7007 | That is said to make things like for (;;) statements work | |
7008 | better. */ | |
527159b7 | 7009 | if (debug_infrun) |
3e43a32a MS |
7010 | fprintf_unfiltered (gdb_stdlog, |
7011 | "infrun: stepped to a different line\n"); | |
bdc36728 | 7012 | end_stepping_range (ecs); |
488f131b JB |
7013 | return; |
7014 | } | |
c906108c | 7015 | |
488f131b | 7016 | /* We aren't done stepping. |
c906108c | 7017 | |
488f131b JB |
7018 | Optimize by setting the stepping range to the line. |
7019 | (We might not be in the original line, but if we entered a | |
7020 | new line in mid-statement, we continue stepping. This makes | |
7021 | things like for(;;) statements work better.) */ | |
c906108c | 7022 | |
16c381f0 JK |
7023 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7024 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7025 | ecs->event_thread->control.may_range_step = 1; |
edb3359d | 7026 | set_step_info (frame, stop_pc_sal); |
488f131b | 7027 | |
527159b7 | 7028 | if (debug_infrun) |
8a9de0e4 | 7029 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 7030 | keep_going (ecs); |
104c1213 JM |
7031 | } |
7032 | ||
c447ac0b PA |
7033 | /* In all-stop mode, if we're currently stepping but have stopped in |
7034 | some other thread, we may need to switch back to the stepped | |
7035 | thread. Returns true we set the inferior running, false if we left | |
7036 | it stopped (and the event needs further processing). */ | |
7037 | ||
7038 | static int | |
7039 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
7040 | { | |
fbea99ea | 7041 | if (!target_is_non_stop_p ()) |
c447ac0b PA |
7042 | { |
7043 | struct thread_info *tp; | |
99619bea PA |
7044 | struct thread_info *stepping_thread; |
7045 | ||
7046 | /* If any thread is blocked on some internal breakpoint, and we | |
7047 | simply need to step over that breakpoint to get it going | |
7048 | again, do that first. */ | |
7049 | ||
7050 | /* However, if we see an event for the stepping thread, then we | |
7051 | know all other threads have been moved past their breakpoints | |
7052 | already. Let the caller check whether the step is finished, | |
7053 | etc., before deciding to move it past a breakpoint. */ | |
7054 | if (ecs->event_thread->control.step_range_end != 0) | |
7055 | return 0; | |
7056 | ||
7057 | /* Check if the current thread is blocked on an incomplete | |
7058 | step-over, interrupted by a random signal. */ | |
7059 | if (ecs->event_thread->control.trap_expected | |
7060 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7061 | { |
99619bea PA |
7062 | if (debug_infrun) |
7063 | { | |
7064 | fprintf_unfiltered (gdb_stdlog, | |
7065 | "infrun: need to finish step-over of [%s]\n", | |
7066 | target_pid_to_str (ecs->event_thread->ptid)); | |
7067 | } | |
7068 | keep_going (ecs); | |
7069 | return 1; | |
7070 | } | |
2adfaa28 | 7071 | |
99619bea PA |
7072 | /* Check if the current thread is blocked by a single-step |
7073 | breakpoint of another thread. */ | |
7074 | if (ecs->hit_singlestep_breakpoint) | |
7075 | { | |
7076 | if (debug_infrun) | |
7077 | { | |
7078 | fprintf_unfiltered (gdb_stdlog, | |
7079 | "infrun: need to step [%s] over single-step " | |
7080 | "breakpoint\n", | |
7081 | target_pid_to_str (ecs->ptid)); | |
7082 | } | |
7083 | keep_going (ecs); | |
7084 | return 1; | |
7085 | } | |
7086 | ||
4d9d9d04 PA |
7087 | /* If this thread needs yet another step-over (e.g., stepping |
7088 | through a delay slot), do it first before moving on to | |
7089 | another thread. */ | |
7090 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7091 | { | |
7092 | if (debug_infrun) | |
7093 | { | |
7094 | fprintf_unfiltered (gdb_stdlog, | |
7095 | "infrun: thread [%s] still needs step-over\n", | |
7096 | target_pid_to_str (ecs->event_thread->ptid)); | |
7097 | } | |
7098 | keep_going (ecs); | |
7099 | return 1; | |
7100 | } | |
70509625 | 7101 | |
483805cf PA |
7102 | /* If scheduler locking applies even if not stepping, there's no |
7103 | need to walk over threads. Above we've checked whether the | |
7104 | current thread is stepping. If some other thread not the | |
7105 | event thread is stepping, then it must be that scheduler | |
7106 | locking is not in effect. */ | |
856e7dd6 | 7107 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
7108 | return 0; |
7109 | ||
4d9d9d04 PA |
7110 | /* Otherwise, we no longer expect a trap in the current thread. |
7111 | Clear the trap_expected flag before switching back -- this is | |
7112 | what keep_going does as well, if we call it. */ | |
7113 | ecs->event_thread->control.trap_expected = 0; | |
7114 | ||
7115 | /* Likewise, clear the signal if it should not be passed. */ | |
7116 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7117 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7118 | ||
7119 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 7120 | step/next/etc. */ |
4d9d9d04 PA |
7121 | if (start_step_over ()) |
7122 | { | |
7123 | prepare_to_wait (ecs); | |
7124 | return 1; | |
7125 | } | |
7126 | ||
7127 | /* Look for the stepping/nexting thread. */ | |
483805cf | 7128 | stepping_thread = NULL; |
4d9d9d04 | 7129 | |
034f788c | 7130 | ALL_NON_EXITED_THREADS (tp) |
483805cf | 7131 | { |
fbea99ea PA |
7132 | /* Ignore threads of processes the caller is not |
7133 | resuming. */ | |
483805cf | 7134 | if (!sched_multi |
1afd5965 | 7135 | && ptid_get_pid (tp->ptid) != ptid_get_pid (ecs->ptid)) |
483805cf PA |
7136 | continue; |
7137 | ||
7138 | /* When stepping over a breakpoint, we lock all threads | |
7139 | except the one that needs to move past the breakpoint. | |
7140 | If a non-event thread has this set, the "incomplete | |
7141 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
7142 | if (tp->control.trap_expected) |
7143 | { | |
7144 | internal_error (__FILE__, __LINE__, | |
7145 | "[%s] has inconsistent state: " | |
7146 | "trap_expected=%d\n", | |
7147 | target_pid_to_str (tp->ptid), | |
7148 | tp->control.trap_expected); | |
7149 | } | |
483805cf PA |
7150 | |
7151 | /* Did we find the stepping thread? */ | |
7152 | if (tp->control.step_range_end) | |
7153 | { | |
7154 | /* Yep. There should only one though. */ | |
7155 | gdb_assert (stepping_thread == NULL); | |
7156 | ||
7157 | /* The event thread is handled at the top, before we | |
7158 | enter this loop. */ | |
7159 | gdb_assert (tp != ecs->event_thread); | |
7160 | ||
7161 | /* If some thread other than the event thread is | |
7162 | stepping, then scheduler locking can't be in effect, | |
7163 | otherwise we wouldn't have resumed the current event | |
7164 | thread in the first place. */ | |
856e7dd6 | 7165 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
7166 | |
7167 | stepping_thread = tp; | |
7168 | } | |
99619bea PA |
7169 | } |
7170 | ||
483805cf | 7171 | if (stepping_thread != NULL) |
99619bea | 7172 | { |
c447ac0b PA |
7173 | if (debug_infrun) |
7174 | fprintf_unfiltered (gdb_stdlog, | |
7175 | "infrun: switching back to stepped thread\n"); | |
7176 | ||
2ac7589c PA |
7177 | if (keep_going_stepped_thread (stepping_thread)) |
7178 | { | |
7179 | prepare_to_wait (ecs); | |
7180 | return 1; | |
7181 | } | |
7182 | } | |
7183 | } | |
2adfaa28 | 7184 | |
2ac7589c PA |
7185 | return 0; |
7186 | } | |
2adfaa28 | 7187 | |
2ac7589c PA |
7188 | /* Set a previously stepped thread back to stepping. Returns true on |
7189 | success, false if the resume is not possible (e.g., the thread | |
7190 | vanished). */ | |
7191 | ||
7192 | static int | |
7193 | keep_going_stepped_thread (struct thread_info *tp) | |
7194 | { | |
7195 | struct frame_info *frame; | |
2ac7589c PA |
7196 | struct execution_control_state ecss; |
7197 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7198 | |
2ac7589c PA |
7199 | /* If the stepping thread exited, then don't try to switch back and |
7200 | resume it, which could fail in several different ways depending | |
7201 | on the target. Instead, just keep going. | |
2adfaa28 | 7202 | |
2ac7589c PA |
7203 | We can find a stepping dead thread in the thread list in two |
7204 | cases: | |
2adfaa28 | 7205 | |
2ac7589c PA |
7206 | - The target supports thread exit events, and when the target |
7207 | tries to delete the thread from the thread list, inferior_ptid | |
7208 | pointed at the exiting thread. In such case, calling | |
7209 | delete_thread does not really remove the thread from the list; | |
7210 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7211 | |
2ac7589c PA |
7212 | - The target's debug interface does not support thread exit |
7213 | events, and so we have no idea whatsoever if the previously | |
7214 | stepping thread is still alive. For that reason, we need to | |
7215 | synchronously query the target now. */ | |
2adfaa28 | 7216 | |
2ac7589c PA |
7217 | if (is_exited (tp->ptid) |
7218 | || !target_thread_alive (tp->ptid)) | |
7219 | { | |
7220 | if (debug_infrun) | |
7221 | fprintf_unfiltered (gdb_stdlog, | |
7222 | "infrun: not resuming previously " | |
7223 | "stepped thread, it has vanished\n"); | |
7224 | ||
7225 | delete_thread (tp->ptid); | |
7226 | return 0; | |
c447ac0b | 7227 | } |
2ac7589c PA |
7228 | |
7229 | if (debug_infrun) | |
7230 | fprintf_unfiltered (gdb_stdlog, | |
7231 | "infrun: resuming previously stepped thread\n"); | |
7232 | ||
7233 | reset_ecs (ecs, tp); | |
7234 | switch_to_thread (tp->ptid); | |
7235 | ||
7236 | stop_pc = regcache_read_pc (get_thread_regcache (tp->ptid)); | |
7237 | frame = get_current_frame (); | |
2ac7589c PA |
7238 | |
7239 | /* If the PC of the thread we were trying to single-step has | |
7240 | changed, then that thread has trapped or been signaled, but the | |
7241 | event has not been reported to GDB yet. Re-poll the target | |
7242 | looking for this particular thread's event (i.e. temporarily | |
7243 | enable schedlock) by: | |
7244 | ||
7245 | - setting a break at the current PC | |
7246 | - resuming that particular thread, only (by setting trap | |
7247 | expected) | |
7248 | ||
7249 | This prevents us continuously moving the single-step breakpoint | |
7250 | forward, one instruction at a time, overstepping. */ | |
7251 | ||
7252 | if (stop_pc != tp->prev_pc) | |
7253 | { | |
7254 | ptid_t resume_ptid; | |
7255 | ||
7256 | if (debug_infrun) | |
7257 | fprintf_unfiltered (gdb_stdlog, | |
7258 | "infrun: expected thread advanced also (%s -> %s)\n", | |
7259 | paddress (target_gdbarch (), tp->prev_pc), | |
7260 | paddress (target_gdbarch (), stop_pc)); | |
7261 | ||
7262 | /* Clear the info of the previous step-over, as it's no longer | |
7263 | valid (if the thread was trying to step over a breakpoint, it | |
7264 | has already succeeded). It's what keep_going would do too, | |
7265 | if we called it. Do this before trying to insert the sss | |
7266 | breakpoint, otherwise if we were previously trying to step | |
7267 | over this exact address in another thread, the breakpoint is | |
7268 | skipped. */ | |
7269 | clear_step_over_info (); | |
7270 | tp->control.trap_expected = 0; | |
7271 | ||
7272 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7273 | get_frame_address_space (frame), | |
7274 | stop_pc); | |
7275 | ||
372316f1 | 7276 | tp->resumed = 1; |
fbea99ea | 7277 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7278 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7279 | } | |
7280 | else | |
7281 | { | |
7282 | if (debug_infrun) | |
7283 | fprintf_unfiltered (gdb_stdlog, | |
7284 | "infrun: expected thread still hasn't advanced\n"); | |
7285 | ||
7286 | keep_going_pass_signal (ecs); | |
7287 | } | |
7288 | return 1; | |
c447ac0b PA |
7289 | } |
7290 | ||
8b061563 PA |
7291 | /* Is thread TP in the middle of (software or hardware) |
7292 | single-stepping? (Note the result of this function must never be | |
7293 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7294 | |
a289b8f6 | 7295 | static int |
b3444185 | 7296 | currently_stepping (struct thread_info *tp) |
a7212384 | 7297 | { |
8358c15c JK |
7298 | return ((tp->control.step_range_end |
7299 | && tp->control.step_resume_breakpoint == NULL) | |
7300 | || tp->control.trap_expected | |
af48d08f | 7301 | || tp->stepped_breakpoint |
8358c15c | 7302 | || bpstat_should_step ()); |
a7212384 UW |
7303 | } |
7304 | ||
b2175913 MS |
7305 | /* Inferior has stepped into a subroutine call with source code that |
7306 | we should not step over. Do step to the first line of code in | |
7307 | it. */ | |
c2c6d25f JM |
7308 | |
7309 | static void | |
568d6575 UW |
7310 | handle_step_into_function (struct gdbarch *gdbarch, |
7311 | struct execution_control_state *ecs) | |
c2c6d25f | 7312 | { |
43f3e411 | 7313 | struct compunit_symtab *cust; |
2afb61aa | 7314 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f | 7315 | |
7e324e48 GB |
7316 | fill_in_stop_func (gdbarch, ecs); |
7317 | ||
43f3e411 DE |
7318 | cust = find_pc_compunit_symtab (stop_pc); |
7319 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 7320 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 | 7321 | ecs->stop_func_start); |
c2c6d25f | 7322 | |
2afb61aa | 7323 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7324 | /* Use the step_resume_break to step until the end of the prologue, |
7325 | even if that involves jumps (as it seems to on the vax under | |
7326 | 4.2). */ | |
7327 | /* If the prologue ends in the middle of a source line, continue to | |
7328 | the end of that source line (if it is still within the function). | |
7329 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7330 | if (stop_func_sal.end |
7331 | && stop_func_sal.pc != ecs->stop_func_start | |
7332 | && stop_func_sal.end < ecs->stop_func_end) | |
7333 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7334 | |
2dbd5e30 KB |
7335 | /* Architectures which require breakpoint adjustment might not be able |
7336 | to place a breakpoint at the computed address. If so, the test | |
7337 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7338 | ecs->stop_func_start to an address at which a breakpoint may be | |
7339 | legitimately placed. | |
8fb3e588 | 7340 | |
2dbd5e30 KB |
7341 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7342 | made, GDB will enter an infinite loop when stepping through | |
7343 | optimized code consisting of VLIW instructions which contain | |
7344 | subinstructions corresponding to different source lines. On | |
7345 | FR-V, it's not permitted to place a breakpoint on any but the | |
7346 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7347 | set, GDB will adjust the breakpoint address to the beginning of | |
7348 | the VLIW instruction. Thus, we need to make the corresponding | |
7349 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7350 | |
568d6575 | 7351 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7352 | { |
7353 | ecs->stop_func_start | |
568d6575 | 7354 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7355 | ecs->stop_func_start); |
2dbd5e30 KB |
7356 | } |
7357 | ||
c2c6d25f JM |
7358 | if (ecs->stop_func_start == stop_pc) |
7359 | { | |
7360 | /* We are already there: stop now. */ | |
bdc36728 | 7361 | end_stepping_range (ecs); |
c2c6d25f JM |
7362 | return; |
7363 | } | |
7364 | else | |
7365 | { | |
7366 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 7367 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
7368 | sr_sal.pc = ecs->stop_func_start; |
7369 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7370 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7371 | |
c2c6d25f | 7372 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7373 | some machines the prologue is where the new fp value is |
7374 | established. */ | |
a6d9a66e | 7375 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7376 | |
7377 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7378 | ecs->event_thread->control.step_range_end |
7379 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7380 | } |
7381 | keep_going (ecs); | |
7382 | } | |
d4f3574e | 7383 | |
b2175913 MS |
7384 | /* Inferior has stepped backward into a subroutine call with source |
7385 | code that we should not step over. Do step to the beginning of the | |
7386 | last line of code in it. */ | |
7387 | ||
7388 | static void | |
568d6575 UW |
7389 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7390 | struct execution_control_state *ecs) | |
b2175913 | 7391 | { |
43f3e411 | 7392 | struct compunit_symtab *cust; |
167e4384 | 7393 | struct symtab_and_line stop_func_sal; |
b2175913 | 7394 | |
7e324e48 GB |
7395 | fill_in_stop_func (gdbarch, ecs); |
7396 | ||
43f3e411 DE |
7397 | cust = find_pc_compunit_symtab (stop_pc); |
7398 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 7399 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 MS |
7400 | ecs->stop_func_start); |
7401 | ||
7402 | stop_func_sal = find_pc_line (stop_pc, 0); | |
7403 | ||
7404 | /* OK, we're just going to keep stepping here. */ | |
7405 | if (stop_func_sal.pc == stop_pc) | |
7406 | { | |
7407 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7408 | end_stepping_range (ecs); |
b2175913 MS |
7409 | } |
7410 | else | |
7411 | { | |
7412 | /* Else just reset the step range and keep going. | |
7413 | No step-resume breakpoint, they don't work for | |
7414 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7415 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7416 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7417 | keep_going (ecs); |
7418 | } | |
7419 | return; | |
7420 | } | |
7421 | ||
d3169d93 | 7422 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7423 | This is used to both functions and to skip over code. */ |
7424 | ||
7425 | static void | |
2c03e5be PA |
7426 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7427 | struct symtab_and_line sr_sal, | |
7428 | struct frame_id sr_id, | |
7429 | enum bptype sr_type) | |
44cbf7b5 | 7430 | { |
611c83ae PA |
7431 | /* There should never be more than one step-resume or longjmp-resume |
7432 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7433 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7434 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7435 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
7436 | |
7437 | if (debug_infrun) | |
7438 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7439 | "infrun: inserting step-resume breakpoint at %s\n", |
7440 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7441 | |
8358c15c | 7442 | inferior_thread ()->control.step_resume_breakpoint |
2c03e5be PA |
7443 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type); |
7444 | } | |
7445 | ||
9da8c2a0 | 7446 | void |
2c03e5be PA |
7447 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7448 | struct symtab_and_line sr_sal, | |
7449 | struct frame_id sr_id) | |
7450 | { | |
7451 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7452 | sr_sal, sr_id, | |
7453 | bp_step_resume); | |
44cbf7b5 | 7454 | } |
7ce450bd | 7455 | |
2c03e5be PA |
7456 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7457 | This is used to skip a potential signal handler. | |
7ce450bd | 7458 | |
14e60db5 DJ |
7459 | This is called with the interrupted function's frame. The signal |
7460 | handler, when it returns, will resume the interrupted function at | |
7461 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7462 | |
7463 | static void | |
2c03e5be | 7464 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
7465 | { |
7466 | struct symtab_and_line sr_sal; | |
a6d9a66e | 7467 | struct gdbarch *gdbarch; |
d303a6c7 | 7468 | |
f4c1edd8 | 7469 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
7470 | init_sal (&sr_sal); /* initialize to zeros */ |
7471 | ||
a6d9a66e | 7472 | gdbarch = get_frame_arch (return_frame); |
568d6575 | 7473 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7474 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7475 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7476 | |
2c03e5be PA |
7477 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7478 | get_stack_frame_id (return_frame), | |
7479 | bp_hp_step_resume); | |
d303a6c7 AC |
7480 | } |
7481 | ||
2c03e5be PA |
7482 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7483 | is used to skip a function after stepping into it (for "next" or if | |
7484 | the called function has no debugging information). | |
14e60db5 DJ |
7485 | |
7486 | The current function has almost always been reached by single | |
7487 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7488 | current function, and the breakpoint will be set at the caller's | |
7489 | resume address. | |
7490 | ||
7491 | This is a separate function rather than reusing | |
2c03e5be | 7492 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7493 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7494 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7495 | |
7496 | static void | |
7497 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7498 | { | |
7499 | struct symtab_and_line sr_sal; | |
a6d9a66e | 7500 | struct gdbarch *gdbarch; |
14e60db5 DJ |
7501 | |
7502 | /* We shouldn't have gotten here if we don't know where the call site | |
7503 | is. */ | |
c7ce8faa | 7504 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 DJ |
7505 | |
7506 | init_sal (&sr_sal); /* initialize to zeros */ | |
7507 | ||
a6d9a66e | 7508 | gdbarch = frame_unwind_caller_arch (next_frame); |
c7ce8faa DJ |
7509 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7510 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7511 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7512 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7513 | |
a6d9a66e | 7514 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7515 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7516 | } |
7517 | ||
611c83ae PA |
7518 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7519 | new breakpoint at the target of a jmp_buf. The handling of | |
7520 | longjmp-resume uses the same mechanisms used for handling | |
7521 | "step-resume" breakpoints. */ | |
7522 | ||
7523 | static void | |
a6d9a66e | 7524 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7525 | { |
e81a37f7 TT |
7526 | /* There should never be more than one longjmp-resume breakpoint per |
7527 | thread, so we should never be setting a new | |
611c83ae | 7528 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7529 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
7530 | |
7531 | if (debug_infrun) | |
7532 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7533 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
7534 | paddress (gdbarch, pc)); | |
611c83ae | 7535 | |
e81a37f7 | 7536 | inferior_thread ()->control.exception_resume_breakpoint = |
a6d9a66e | 7537 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); |
611c83ae PA |
7538 | } |
7539 | ||
186c406b TT |
7540 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7541 | the exception. The block B is the block of the unwinder debug hook | |
7542 | function. FRAME is the frame corresponding to the call to this | |
7543 | function. SYM is the symbol of the function argument holding the | |
7544 | target PC of the exception. */ | |
7545 | ||
7546 | static void | |
7547 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7548 | const struct block *b, |
186c406b TT |
7549 | struct frame_info *frame, |
7550 | struct symbol *sym) | |
7551 | { | |
492d29ea | 7552 | TRY |
186c406b | 7553 | { |
63e43d3a | 7554 | struct block_symbol vsym; |
186c406b TT |
7555 | struct value *value; |
7556 | CORE_ADDR handler; | |
7557 | struct breakpoint *bp; | |
7558 | ||
63e43d3a PMR |
7559 | vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL); |
7560 | value = read_var_value (vsym.symbol, vsym.block, frame); | |
186c406b TT |
7561 | /* If the value was optimized out, revert to the old behavior. */ |
7562 | if (! value_optimized_out (value)) | |
7563 | { | |
7564 | handler = value_as_address (value); | |
7565 | ||
7566 | if (debug_infrun) | |
7567 | fprintf_unfiltered (gdb_stdlog, | |
7568 | "infrun: exception resume at %lx\n", | |
7569 | (unsigned long) handler); | |
7570 | ||
7571 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7572 | handler, bp_exception_resume); | |
c70a6932 JK |
7573 | |
7574 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7575 | frame = NULL; | |
7576 | ||
5d5658a1 | 7577 | bp->thread = tp->global_num; |
186c406b TT |
7578 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7579 | } | |
7580 | } | |
492d29ea PA |
7581 | CATCH (e, RETURN_MASK_ERROR) |
7582 | { | |
7583 | /* We want to ignore errors here. */ | |
7584 | } | |
7585 | END_CATCH | |
186c406b TT |
7586 | } |
7587 | ||
28106bc2 SDJ |
7588 | /* A helper for check_exception_resume that sets an |
7589 | exception-breakpoint based on a SystemTap probe. */ | |
7590 | ||
7591 | static void | |
7592 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7593 | const struct bound_probe *probe, |
28106bc2 SDJ |
7594 | struct frame_info *frame) |
7595 | { | |
7596 | struct value *arg_value; | |
7597 | CORE_ADDR handler; | |
7598 | struct breakpoint *bp; | |
7599 | ||
7600 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7601 | if (!arg_value) | |
7602 | return; | |
7603 | ||
7604 | handler = value_as_address (arg_value); | |
7605 | ||
7606 | if (debug_infrun) | |
7607 | fprintf_unfiltered (gdb_stdlog, | |
7608 | "infrun: exception resume at %s\n", | |
6bac7473 | 7609 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
7610 | handler)); |
7611 | ||
7612 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7613 | handler, bp_exception_resume); | |
5d5658a1 | 7614 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7615 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7616 | } | |
7617 | ||
186c406b TT |
7618 | /* This is called when an exception has been intercepted. Check to |
7619 | see whether the exception's destination is of interest, and if so, | |
7620 | set an exception resume breakpoint there. */ | |
7621 | ||
7622 | static void | |
7623 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7624 | struct frame_info *frame) |
186c406b | 7625 | { |
729662a5 | 7626 | struct bound_probe probe; |
28106bc2 SDJ |
7627 | struct symbol *func; |
7628 | ||
7629 | /* First see if this exception unwinding breakpoint was set via a | |
7630 | SystemTap probe point. If so, the probe has two arguments: the | |
7631 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7632 | set a breakpoint there. */ | |
6bac7473 | 7633 | probe = find_probe_by_pc (get_frame_pc (frame)); |
729662a5 | 7634 | if (probe.probe) |
28106bc2 | 7635 | { |
729662a5 | 7636 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7637 | return; |
7638 | } | |
7639 | ||
7640 | func = get_frame_function (frame); | |
7641 | if (!func) | |
7642 | return; | |
186c406b | 7643 | |
492d29ea | 7644 | TRY |
186c406b | 7645 | { |
3977b71f | 7646 | const struct block *b; |
8157b174 | 7647 | struct block_iterator iter; |
186c406b TT |
7648 | struct symbol *sym; |
7649 | int argno = 0; | |
7650 | ||
7651 | /* The exception breakpoint is a thread-specific breakpoint on | |
7652 | the unwinder's debug hook, declared as: | |
7653 | ||
7654 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7655 | ||
7656 | The CFA argument indicates the frame to which control is | |
7657 | about to be transferred. HANDLER is the destination PC. | |
7658 | ||
7659 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7660 | This is not extremely efficient but it avoids issues in gdb | |
7661 | with computing the DWARF CFA, and it also works even in weird | |
7662 | cases such as throwing an exception from inside a signal | |
7663 | handler. */ | |
7664 | ||
7665 | b = SYMBOL_BLOCK_VALUE (func); | |
7666 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7667 | { | |
7668 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7669 | continue; | |
7670 | ||
7671 | if (argno == 0) | |
7672 | ++argno; | |
7673 | else | |
7674 | { | |
7675 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7676 | b, frame, sym); | |
7677 | break; | |
7678 | } | |
7679 | } | |
7680 | } | |
492d29ea PA |
7681 | CATCH (e, RETURN_MASK_ERROR) |
7682 | { | |
7683 | } | |
7684 | END_CATCH | |
186c406b TT |
7685 | } |
7686 | ||
104c1213 | 7687 | static void |
22bcd14b | 7688 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7689 | { |
527159b7 | 7690 | if (debug_infrun) |
22bcd14b | 7691 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 7692 | |
cd0fc7c3 SS |
7693 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7694 | ecs->wait_some_more = 0; | |
fbea99ea PA |
7695 | |
7696 | /* If all-stop, but the target is always in non-stop mode, stop all | |
7697 | threads now that we're presenting the stop to the user. */ | |
7698 | if (!non_stop && target_is_non_stop_p ()) | |
7699 | stop_all_threads (); | |
cd0fc7c3 SS |
7700 | } |
7701 | ||
4d9d9d04 PA |
7702 | /* Like keep_going, but passes the signal to the inferior, even if the |
7703 | signal is set to nopass. */ | |
d4f3574e SS |
7704 | |
7705 | static void | |
4d9d9d04 | 7706 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7707 | { |
c4dbc9af PA |
7708 | /* Make sure normal_stop is called if we get a QUIT handled before |
7709 | reaching resume. */ | |
7710 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
7711 | ||
4d9d9d04 | 7712 | gdb_assert (ptid_equal (ecs->event_thread->ptid, inferior_ptid)); |
372316f1 | 7713 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7714 | |
d4f3574e | 7715 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
7716 | ecs->event_thread->prev_pc |
7717 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 7718 | |
4d9d9d04 | 7719 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7720 | { |
4d9d9d04 PA |
7721 | struct thread_info *tp = ecs->event_thread; |
7722 | ||
7723 | if (debug_infrun) | |
7724 | fprintf_unfiltered (gdb_stdlog, | |
7725 | "infrun: %s has trap_expected set, " | |
7726 | "resuming to collect trap\n", | |
7727 | target_pid_to_str (tp->ptid)); | |
7728 | ||
a9ba6bae PA |
7729 | /* We haven't yet gotten our trap, and either: intercepted a |
7730 | non-signal event (e.g., a fork); or took a signal which we | |
7731 | are supposed to pass through to the inferior. Simply | |
7732 | continue. */ | |
c4dbc9af | 7733 | discard_cleanups (old_cleanups); |
64ce06e4 | 7734 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7735 | } |
372316f1 PA |
7736 | else if (step_over_info_valid_p ()) |
7737 | { | |
7738 | /* Another thread is stepping over a breakpoint in-line. If | |
7739 | this thread needs a step-over too, queue the request. In | |
7740 | either case, this resume must be deferred for later. */ | |
7741 | struct thread_info *tp = ecs->event_thread; | |
7742 | ||
7743 | if (ecs->hit_singlestep_breakpoint | |
7744 | || thread_still_needs_step_over (tp)) | |
7745 | { | |
7746 | if (debug_infrun) | |
7747 | fprintf_unfiltered (gdb_stdlog, | |
7748 | "infrun: step-over already in progress: " | |
7749 | "step-over for %s deferred\n", | |
7750 | target_pid_to_str (tp->ptid)); | |
7751 | thread_step_over_chain_enqueue (tp); | |
7752 | } | |
7753 | else | |
7754 | { | |
7755 | if (debug_infrun) | |
7756 | fprintf_unfiltered (gdb_stdlog, | |
7757 | "infrun: step-over in progress: " | |
7758 | "resume of %s deferred\n", | |
7759 | target_pid_to_str (tp->ptid)); | |
7760 | } | |
7761 | ||
7762 | discard_cleanups (old_cleanups); | |
7763 | } | |
d4f3574e SS |
7764 | else |
7765 | { | |
31e77af2 | 7766 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7767 | int remove_bp; |
7768 | int remove_wps; | |
8d297bbf | 7769 | step_over_what step_what; |
31e77af2 | 7770 | |
d4f3574e | 7771 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7772 | anyway (if we got a signal, the user asked it be passed to |
7773 | the child) | |
7774 | -- or -- | |
7775 | We got our expected trap, but decided we should resume from | |
7776 | it. | |
d4f3574e | 7777 | |
a9ba6bae | 7778 | We're going to run this baby now! |
d4f3574e | 7779 | |
c36b740a VP |
7780 | Note that insert_breakpoints won't try to re-insert |
7781 | already inserted breakpoints. Therefore, we don't | |
7782 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7783 | |
31e77af2 PA |
7784 | /* If we need to step over a breakpoint, and we're not using |
7785 | displaced stepping to do so, insert all breakpoints | |
7786 | (watchpoints, etc.) but the one we're stepping over, step one | |
7787 | instruction, and then re-insert the breakpoint when that step | |
7788 | is finished. */ | |
963f9c80 | 7789 | |
6c4cfb24 PA |
7790 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7791 | ||
963f9c80 | 7792 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7793 | || (step_what & STEP_OVER_BREAKPOINT)); |
7794 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7795 | |
cb71640d PA |
7796 | /* We can't use displaced stepping if we need to step past a |
7797 | watchpoint. The instruction copied to the scratch pad would | |
7798 | still trigger the watchpoint. */ | |
7799 | if (remove_bp | |
3fc8eb30 | 7800 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7801 | { |
31e77af2 | 7802 | set_step_over_info (get_regcache_aspace (regcache), |
21edc42f YQ |
7803 | regcache_read_pc (regcache), remove_wps, |
7804 | ecs->event_thread->global_num); | |
45e8c884 | 7805 | } |
963f9c80 | 7806 | else if (remove_wps) |
21edc42f | 7807 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
7808 | |
7809 | /* If we now need to do an in-line step-over, we need to stop | |
7810 | all other threads. Note this must be done before | |
7811 | insert_breakpoints below, because that removes the breakpoint | |
7812 | we're about to step over, otherwise other threads could miss | |
7813 | it. */ | |
fbea99ea | 7814 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7815 | stop_all_threads (); |
abbb1732 | 7816 | |
31e77af2 | 7817 | /* Stop stepping if inserting breakpoints fails. */ |
492d29ea | 7818 | TRY |
31e77af2 PA |
7819 | { |
7820 | insert_breakpoints (); | |
7821 | } | |
492d29ea | 7822 | CATCH (e, RETURN_MASK_ERROR) |
31e77af2 PA |
7823 | { |
7824 | exception_print (gdb_stderr, e); | |
22bcd14b | 7825 | stop_waiting (ecs); |
de1fe8c8 | 7826 | discard_cleanups (old_cleanups); |
31e77af2 | 7827 | return; |
d4f3574e | 7828 | } |
492d29ea | 7829 | END_CATCH |
d4f3574e | 7830 | |
963f9c80 | 7831 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7832 | |
c4dbc9af | 7833 | discard_cleanups (old_cleanups); |
64ce06e4 | 7834 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7835 | } |
7836 | ||
488f131b | 7837 | prepare_to_wait (ecs); |
d4f3574e SS |
7838 | } |
7839 | ||
4d9d9d04 PA |
7840 | /* Called when we should continue running the inferior, because the |
7841 | current event doesn't cause a user visible stop. This does the | |
7842 | resuming part; waiting for the next event is done elsewhere. */ | |
7843 | ||
7844 | static void | |
7845 | keep_going (struct execution_control_state *ecs) | |
7846 | { | |
7847 | if (ecs->event_thread->control.trap_expected | |
7848 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7849 | ecs->event_thread->control.trap_expected = 0; | |
7850 | ||
7851 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7852 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7853 | keep_going_pass_signal (ecs); | |
7854 | } | |
7855 | ||
104c1213 JM |
7856 | /* This function normally comes after a resume, before |
7857 | handle_inferior_event exits. It takes care of any last bits of | |
7858 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7859 | |
104c1213 JM |
7860 | static void |
7861 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7862 | { |
527159b7 | 7863 | if (debug_infrun) |
8a9de0e4 | 7864 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 7865 | |
104c1213 | 7866 | ecs->wait_some_more = 1; |
0b333c5e PA |
7867 | |
7868 | if (!target_is_async_p ()) | |
7869 | mark_infrun_async_event_handler (); | |
c906108c | 7870 | } |
11cf8741 | 7871 | |
fd664c91 | 7872 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7873 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7874 | |
7875 | static void | |
bdc36728 | 7876 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7877 | { |
bdc36728 | 7878 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7879 | stop_waiting (ecs); |
fd664c91 PA |
7880 | } |
7881 | ||
33d62d64 JK |
7882 | /* Several print_*_reason functions to print why the inferior has stopped. |
7883 | We always print something when the inferior exits, or receives a signal. | |
7884 | The rest of the cases are dealt with later on in normal_stop and | |
7885 | print_it_typical. Ideally there should be a call to one of these | |
7886 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7887 | stop_waiting is called. |
33d62d64 | 7888 | |
fd664c91 PA |
7889 | Note that we don't call these directly, instead we delegate that to |
7890 | the interpreters, through observers. Interpreters then call these | |
7891 | with whatever uiout is right. */ | |
33d62d64 | 7892 | |
fd664c91 PA |
7893 | void |
7894 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7895 | { |
fd664c91 | 7896 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7897 | |
112e8700 | 7898 | if (uiout->is_mi_like_p ()) |
fd664c91 | 7899 | { |
112e8700 | 7900 | uiout->field_string ("reason", |
fd664c91 PA |
7901 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
7902 | } | |
7903 | } | |
33d62d64 | 7904 | |
fd664c91 PA |
7905 | void |
7906 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7907 | { |
33d62d64 | 7908 | annotate_signalled (); |
112e8700 SM |
7909 | if (uiout->is_mi_like_p ()) |
7910 | uiout->field_string | |
7911 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7912 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 7913 | annotate_signal_name (); |
112e8700 | 7914 | uiout->field_string ("signal-name", |
2ea28649 | 7915 | gdb_signal_to_name (siggnal)); |
33d62d64 | 7916 | annotate_signal_name_end (); |
112e8700 | 7917 | uiout->text (", "); |
33d62d64 | 7918 | annotate_signal_string (); |
112e8700 | 7919 | uiout->field_string ("signal-meaning", |
2ea28649 | 7920 | gdb_signal_to_string (siggnal)); |
33d62d64 | 7921 | annotate_signal_string_end (); |
112e8700 SM |
7922 | uiout->text (".\n"); |
7923 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
7924 | } |
7925 | ||
fd664c91 PA |
7926 | void |
7927 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7928 | { |
fda326dd TT |
7929 | struct inferior *inf = current_inferior (); |
7930 | const char *pidstr = target_pid_to_str (pid_to_ptid (inf->pid)); | |
7931 | ||
33d62d64 JK |
7932 | annotate_exited (exitstatus); |
7933 | if (exitstatus) | |
7934 | { | |
112e8700 SM |
7935 | if (uiout->is_mi_like_p ()) |
7936 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
7937 | uiout->text ("[Inferior "); | |
7938 | uiout->text (plongest (inf->num)); | |
7939 | uiout->text (" ("); | |
7940 | uiout->text (pidstr); | |
7941 | uiout->text (") exited with code "); | |
7942 | uiout->field_fmt ("exit-code", "0%o", (unsigned int) exitstatus); | |
7943 | uiout->text ("]\n"); | |
33d62d64 JK |
7944 | } |
7945 | else | |
11cf8741 | 7946 | { |
112e8700 SM |
7947 | if (uiout->is_mi_like_p ()) |
7948 | uiout->field_string | |
7949 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
7950 | uiout->text ("[Inferior "); | |
7951 | uiout->text (plongest (inf->num)); | |
7952 | uiout->text (" ("); | |
7953 | uiout->text (pidstr); | |
7954 | uiout->text (") exited normally]\n"); | |
33d62d64 | 7955 | } |
33d62d64 JK |
7956 | } |
7957 | ||
012b3a21 WT |
7958 | /* Some targets/architectures can do extra processing/display of |
7959 | segmentation faults. E.g., Intel MPX boundary faults. | |
7960 | Call the architecture dependent function to handle the fault. */ | |
7961 | ||
7962 | static void | |
7963 | handle_segmentation_fault (struct ui_out *uiout) | |
7964 | { | |
7965 | struct regcache *regcache = get_current_regcache (); | |
7966 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7967 | ||
7968 | if (gdbarch_handle_segmentation_fault_p (gdbarch)) | |
7969 | gdbarch_handle_segmentation_fault (gdbarch, uiout); | |
7970 | } | |
7971 | ||
fd664c91 PA |
7972 | void |
7973 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 7974 | { |
f303dbd6 PA |
7975 | struct thread_info *thr = inferior_thread (); |
7976 | ||
33d62d64 JK |
7977 | annotate_signal (); |
7978 | ||
112e8700 | 7979 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
7980 | ; |
7981 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 7982 | { |
f303dbd6 | 7983 | const char *name; |
33d62d64 | 7984 | |
112e8700 SM |
7985 | uiout->text ("\nThread "); |
7986 | uiout->field_fmt ("thread-id", "%s", print_thread_id (thr)); | |
f303dbd6 PA |
7987 | |
7988 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
7989 | if (name != NULL) | |
7990 | { | |
112e8700 SM |
7991 | uiout->text (" \""); |
7992 | uiout->field_fmt ("name", "%s", name); | |
7993 | uiout->text ("\""); | |
f303dbd6 | 7994 | } |
33d62d64 | 7995 | } |
f303dbd6 | 7996 | else |
112e8700 | 7997 | uiout->text ("\nProgram"); |
f303dbd6 | 7998 | |
112e8700 SM |
7999 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8000 | uiout->text (" stopped"); | |
33d62d64 JK |
8001 | else |
8002 | { | |
112e8700 | 8003 | uiout->text (" received signal "); |
8b93c638 | 8004 | annotate_signal_name (); |
112e8700 SM |
8005 | if (uiout->is_mi_like_p ()) |
8006 | uiout->field_string | |
8007 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8008 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8009 | annotate_signal_name_end (); |
112e8700 | 8010 | uiout->text (", "); |
8b93c638 | 8011 | annotate_signal_string (); |
112e8700 | 8012 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 WT |
8013 | |
8014 | if (siggnal == GDB_SIGNAL_SEGV) | |
8015 | handle_segmentation_fault (uiout); | |
8016 | ||
8b93c638 | 8017 | annotate_signal_string_end (); |
33d62d64 | 8018 | } |
112e8700 | 8019 | uiout->text (".\n"); |
33d62d64 | 8020 | } |
252fbfc8 | 8021 | |
fd664c91 PA |
8022 | void |
8023 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8024 | { |
112e8700 | 8025 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8026 | } |
43ff13b4 | 8027 | |
0c7e1a46 PA |
8028 | /* Print current location without a level number, if we have changed |
8029 | functions or hit a breakpoint. Print source line if we have one. | |
8030 | bpstat_print contains the logic deciding in detail what to print, | |
8031 | based on the event(s) that just occurred. */ | |
8032 | ||
243a9253 PA |
8033 | static void |
8034 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8035 | { |
8036 | int bpstat_ret; | |
f486487f | 8037 | enum print_what source_flag; |
0c7e1a46 PA |
8038 | int do_frame_printing = 1; |
8039 | struct thread_info *tp = inferior_thread (); | |
8040 | ||
8041 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8042 | switch (bpstat_ret) | |
8043 | { | |
8044 | case PRINT_UNKNOWN: | |
8045 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8046 | should) carry around the function and does (or should) use | |
8047 | that when doing a frame comparison. */ | |
8048 | if (tp->control.stop_step | |
8049 | && frame_id_eq (tp->control.step_frame_id, | |
8050 | get_frame_id (get_current_frame ())) | |
885eeb5b | 8051 | && tp->control.step_start_function == find_pc_function (stop_pc)) |
0c7e1a46 PA |
8052 | { |
8053 | /* Finished step, just print source line. */ | |
8054 | source_flag = SRC_LINE; | |
8055 | } | |
8056 | else | |
8057 | { | |
8058 | /* Print location and source line. */ | |
8059 | source_flag = SRC_AND_LOC; | |
8060 | } | |
8061 | break; | |
8062 | case PRINT_SRC_AND_LOC: | |
8063 | /* Print location and source line. */ | |
8064 | source_flag = SRC_AND_LOC; | |
8065 | break; | |
8066 | case PRINT_SRC_ONLY: | |
8067 | source_flag = SRC_LINE; | |
8068 | break; | |
8069 | case PRINT_NOTHING: | |
8070 | /* Something bogus. */ | |
8071 | source_flag = SRC_LINE; | |
8072 | do_frame_printing = 0; | |
8073 | break; | |
8074 | default: | |
8075 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8076 | } | |
8077 | ||
8078 | /* The behavior of this routine with respect to the source | |
8079 | flag is: | |
8080 | SRC_LINE: Print only source line | |
8081 | LOCATION: Print only location | |
8082 | SRC_AND_LOC: Print location and source line. */ | |
8083 | if (do_frame_printing) | |
8084 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8085 | } |
8086 | ||
243a9253 PA |
8087 | /* See infrun.h. */ |
8088 | ||
8089 | void | |
8090 | print_stop_event (struct ui_out *uiout) | |
8091 | { | |
243a9253 PA |
8092 | struct target_waitstatus last; |
8093 | ptid_t last_ptid; | |
8094 | struct thread_info *tp; | |
8095 | ||
8096 | get_last_target_status (&last_ptid, &last); | |
8097 | ||
67ad9399 TT |
8098 | { |
8099 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8100 | |
67ad9399 | 8101 | print_stop_location (&last); |
243a9253 | 8102 | |
67ad9399 TT |
8103 | /* Display the auto-display expressions. */ |
8104 | do_displays (); | |
8105 | } | |
243a9253 PA |
8106 | |
8107 | tp = inferior_thread (); | |
8108 | if (tp->thread_fsm != NULL | |
8109 | && thread_fsm_finished_p (tp->thread_fsm)) | |
8110 | { | |
8111 | struct return_value_info *rv; | |
8112 | ||
8113 | rv = thread_fsm_return_value (tp->thread_fsm); | |
8114 | if (rv != NULL) | |
8115 | print_return_value (uiout, rv); | |
8116 | } | |
0c7e1a46 PA |
8117 | } |
8118 | ||
388a7084 PA |
8119 | /* See infrun.h. */ |
8120 | ||
8121 | void | |
8122 | maybe_remove_breakpoints (void) | |
8123 | { | |
8124 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
8125 | { | |
8126 | if (remove_breakpoints ()) | |
8127 | { | |
8128 | target_terminal_ours_for_output (); | |
8129 | printf_filtered (_("Cannot remove breakpoints because " | |
8130 | "program is no longer writable.\nFurther " | |
8131 | "execution is probably impossible.\n")); | |
8132 | } | |
8133 | } | |
8134 | } | |
8135 | ||
4c2f2a79 PA |
8136 | /* The execution context that just caused a normal stop. */ |
8137 | ||
8138 | struct stop_context | |
8139 | { | |
8140 | /* The stop ID. */ | |
8141 | ULONGEST stop_id; | |
c906108c | 8142 | |
4c2f2a79 | 8143 | /* The event PTID. */ |
c906108c | 8144 | |
4c2f2a79 PA |
8145 | ptid_t ptid; |
8146 | ||
8147 | /* If stopp for a thread event, this is the thread that caused the | |
8148 | stop. */ | |
8149 | struct thread_info *thread; | |
8150 | ||
8151 | /* The inferior that caused the stop. */ | |
8152 | int inf_num; | |
8153 | }; | |
8154 | ||
8155 | /* Returns a new stop context. If stopped for a thread event, this | |
8156 | takes a strong reference to the thread. */ | |
8157 | ||
8158 | static struct stop_context * | |
8159 | save_stop_context (void) | |
8160 | { | |
224c3ddb | 8161 | struct stop_context *sc = XNEW (struct stop_context); |
4c2f2a79 PA |
8162 | |
8163 | sc->stop_id = get_stop_id (); | |
8164 | sc->ptid = inferior_ptid; | |
8165 | sc->inf_num = current_inferior ()->num; | |
8166 | ||
8167 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
8168 | { | |
8169 | /* Take a strong reference so that the thread can't be deleted | |
8170 | yet. */ | |
8171 | sc->thread = inferior_thread (); | |
803bdfe4 | 8172 | sc->thread->incref (); |
4c2f2a79 PA |
8173 | } |
8174 | else | |
8175 | sc->thread = NULL; | |
8176 | ||
8177 | return sc; | |
8178 | } | |
8179 | ||
8180 | /* Release a stop context previously created with save_stop_context. | |
8181 | Releases the strong reference to the thread as well. */ | |
8182 | ||
8183 | static void | |
8184 | release_stop_context_cleanup (void *arg) | |
8185 | { | |
9a3c8263 | 8186 | struct stop_context *sc = (struct stop_context *) arg; |
4c2f2a79 PA |
8187 | |
8188 | if (sc->thread != NULL) | |
803bdfe4 | 8189 | sc->thread->decref (); |
4c2f2a79 PA |
8190 | xfree (sc); |
8191 | } | |
8192 | ||
8193 | /* Return true if the current context no longer matches the saved stop | |
8194 | context. */ | |
8195 | ||
8196 | static int | |
8197 | stop_context_changed (struct stop_context *prev) | |
8198 | { | |
8199 | if (!ptid_equal (prev->ptid, inferior_ptid)) | |
8200 | return 1; | |
8201 | if (prev->inf_num != current_inferior ()->num) | |
8202 | return 1; | |
8203 | if (prev->thread != NULL && prev->thread->state != THREAD_STOPPED) | |
8204 | return 1; | |
8205 | if (get_stop_id () != prev->stop_id) | |
8206 | return 1; | |
8207 | return 0; | |
8208 | } | |
8209 | ||
8210 | /* See infrun.h. */ | |
8211 | ||
8212 | int | |
96baa820 | 8213 | normal_stop (void) |
c906108c | 8214 | { |
73b65bb0 DJ |
8215 | struct target_waitstatus last; |
8216 | ptid_t last_ptid; | |
29f49a6a | 8217 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
e1316e60 | 8218 | ptid_t pid_ptid; |
73b65bb0 DJ |
8219 | |
8220 | get_last_target_status (&last_ptid, &last); | |
8221 | ||
4c2f2a79 PA |
8222 | new_stop_id (); |
8223 | ||
29f49a6a PA |
8224 | /* If an exception is thrown from this point on, make sure to |
8225 | propagate GDB's knowledge of the executing state to the | |
8226 | frontend/user running state. A QUIT is an easy exception to see | |
8227 | here, so do this before any filtered output. */ | |
c35b1492 PA |
8228 | if (!non_stop) |
8229 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
e1316e60 PA |
8230 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8231 | || last.kind == TARGET_WAITKIND_EXITED) | |
8232 | { | |
8233 | /* On some targets, we may still have live threads in the | |
8234 | inferior when we get a process exit event. E.g., for | |
8235 | "checkpoint", when the current checkpoint/fork exits, | |
8236 | linux-fork.c automatically switches to another fork from | |
8237 | within target_mourn_inferior. */ | |
8238 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
8239 | { | |
8240 | pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
8241 | make_cleanup (finish_thread_state_cleanup, &pid_ptid); | |
8242 | } | |
8243 | } | |
8244 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c35b1492 | 8245 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); |
29f49a6a | 8246 | |
b57bacec PA |
8247 | /* As we're presenting a stop, and potentially removing breakpoints, |
8248 | update the thread list so we can tell whether there are threads | |
8249 | running on the target. With target remote, for example, we can | |
8250 | only learn about new threads when we explicitly update the thread | |
8251 | list. Do this before notifying the interpreters about signal | |
8252 | stops, end of stepping ranges, etc., so that the "new thread" | |
8253 | output is emitted before e.g., "Program received signal FOO", | |
8254 | instead of after. */ | |
8255 | update_thread_list (); | |
8256 | ||
8257 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
8258 | observer_notify_signal_received (inferior_thread ()->suspend.stop_signal); | |
8259 | ||
c906108c SS |
8260 | /* As with the notification of thread events, we want to delay |
8261 | notifying the user that we've switched thread context until | |
8262 | the inferior actually stops. | |
8263 | ||
73b65bb0 DJ |
8264 | There's no point in saying anything if the inferior has exited. |
8265 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8266 | "received a signal". |
8267 | ||
8268 | Also skip saying anything in non-stop mode. In that mode, as we | |
8269 | don't want GDB to switch threads behind the user's back, to avoid | |
8270 | races where the user is typing a command to apply to thread x, | |
8271 | but GDB switches to thread y before the user finishes entering | |
8272 | the command, fetch_inferior_event installs a cleanup to restore | |
8273 | the current thread back to the thread the user had selected right | |
8274 | after this event is handled, so we're not really switching, only | |
8275 | informing of a stop. */ | |
4f8d22e3 PA |
8276 | if (!non_stop |
8277 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
8278 | && target_has_execution |
8279 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8280 | && last.kind != TARGET_WAITKIND_EXITED |
8281 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8282 | { |
0e454242 | 8283 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8284 | { |
8285 | target_terminal_ours_for_output (); | |
8286 | printf_filtered (_("[Switching to %s]\n"), | |
8287 | target_pid_to_str (inferior_ptid)); | |
8288 | annotate_thread_changed (); | |
8289 | } | |
39f77062 | 8290 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8291 | } |
c906108c | 8292 | |
0e5bf2a8 PA |
8293 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8294 | { | |
0e454242 | 8295 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8296 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8297 | { | |
8298 | target_terminal_ours_for_output (); | |
8299 | printf_filtered (_("No unwaited-for children left.\n")); | |
8300 | } | |
0e5bf2a8 PA |
8301 | } |
8302 | ||
b57bacec | 8303 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8304 | maybe_remove_breakpoints (); |
c906108c | 8305 | |
c906108c SS |
8306 | /* If an auto-display called a function and that got a signal, |
8307 | delete that auto-display to avoid an infinite recursion. */ | |
8308 | ||
8309 | if (stopped_by_random_signal) | |
8310 | disable_current_display (); | |
8311 | ||
0e454242 | 8312 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8313 | { |
8314 | async_enable_stdin (); | |
8315 | } | |
c906108c | 8316 | |
388a7084 PA |
8317 | /* Let the user/frontend see the threads as stopped. */ |
8318 | do_cleanups (old_chain); | |
8319 | ||
8320 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8321 | and current location is based on that. Handle the case where the | |
8322 | dummy call is returning after being stopped. E.g. the dummy call | |
8323 | previously hit a breakpoint. (If the dummy call returns | |
8324 | normally, we won't reach here.) Do this before the stop hook is | |
8325 | run, so that it doesn't get to see the temporary dummy frame, | |
8326 | which is not where we'll present the stop. */ | |
8327 | if (has_stack_frames ()) | |
8328 | { | |
8329 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8330 | { | |
8331 | /* Pop the empty frame that contains the stack dummy. This | |
8332 | also restores inferior state prior to the call (struct | |
8333 | infcall_suspend_state). */ | |
8334 | struct frame_info *frame = get_current_frame (); | |
8335 | ||
8336 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8337 | frame_pop (frame); | |
8338 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8339 | does which means there's now no selected frame. */ | |
8340 | } | |
8341 | ||
8342 | select_frame (get_current_frame ()); | |
8343 | ||
8344 | /* Set the current source location. */ | |
8345 | set_current_sal_from_frame (get_current_frame ()); | |
8346 | } | |
dd7e2d2b PA |
8347 | |
8348 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8349 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8350 | if (stop_command != NULL) |
8351 | { | |
8352 | struct stop_context *saved_context = save_stop_context (); | |
8353 | struct cleanup *old_chain | |
8354 | = make_cleanup (release_stop_context_cleanup, saved_context); | |
8355 | ||
8356 | catch_errors (hook_stop_stub, stop_command, | |
8357 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
8358 | ||
8359 | /* If the stop hook resumes the target, then there's no point in | |
8360 | trying to notify about the previous stop; its context is | |
8361 | gone. Likewise if the command switches thread or inferior -- | |
8362 | the observers would print a stop for the wrong | |
8363 | thread/inferior. */ | |
8364 | if (stop_context_changed (saved_context)) | |
8365 | { | |
8366 | do_cleanups (old_chain); | |
8367 | return 1; | |
8368 | } | |
8369 | do_cleanups (old_chain); | |
8370 | } | |
dd7e2d2b | 8371 | |
388a7084 PA |
8372 | /* Notify observers about the stop. This is where the interpreters |
8373 | print the stop event. */ | |
8374 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
8375 | observer_notify_normal_stop (inferior_thread ()->control.stop_bpstat, | |
8376 | stop_print_frame); | |
8377 | else | |
8378 | observer_notify_normal_stop (NULL, stop_print_frame); | |
347bddb7 | 8379 | |
243a9253 PA |
8380 | annotate_stopped (); |
8381 | ||
48844aa6 PA |
8382 | if (target_has_execution) |
8383 | { | |
8384 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
8385 | && last.kind != TARGET_WAITKIND_EXITED) | |
8386 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
8387 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8388 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8389 | } |
6c95b8df PA |
8390 | |
8391 | /* Try to get rid of automatically added inferiors that are no | |
8392 | longer needed. Keeping those around slows down things linearly. | |
8393 | Note that this never removes the current inferior. */ | |
8394 | prune_inferiors (); | |
4c2f2a79 PA |
8395 | |
8396 | return 0; | |
c906108c SS |
8397 | } |
8398 | ||
8399 | static int | |
96baa820 | 8400 | hook_stop_stub (void *cmd) |
c906108c | 8401 | { |
5913bcb0 | 8402 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
8403 | return (0); |
8404 | } | |
8405 | \f | |
c5aa993b | 8406 | int |
96baa820 | 8407 | signal_stop_state (int signo) |
c906108c | 8408 | { |
d6b48e9c | 8409 | return signal_stop[signo]; |
c906108c SS |
8410 | } |
8411 | ||
c5aa993b | 8412 | int |
96baa820 | 8413 | signal_print_state (int signo) |
c906108c SS |
8414 | { |
8415 | return signal_print[signo]; | |
8416 | } | |
8417 | ||
c5aa993b | 8418 | int |
96baa820 | 8419 | signal_pass_state (int signo) |
c906108c SS |
8420 | { |
8421 | return signal_program[signo]; | |
8422 | } | |
8423 | ||
2455069d UW |
8424 | static void |
8425 | signal_cache_update (int signo) | |
8426 | { | |
8427 | if (signo == -1) | |
8428 | { | |
a493e3e2 | 8429 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8430 | signal_cache_update (signo); |
8431 | ||
8432 | return; | |
8433 | } | |
8434 | ||
8435 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8436 | && signal_print[signo] == 0 | |
ab04a2af TT |
8437 | && signal_program[signo] == 1 |
8438 | && signal_catch[signo] == 0); | |
2455069d UW |
8439 | } |
8440 | ||
488f131b | 8441 | int |
7bda5e4a | 8442 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8443 | { |
8444 | int ret = signal_stop[signo]; | |
abbb1732 | 8445 | |
d4f3574e | 8446 | signal_stop[signo] = state; |
2455069d | 8447 | signal_cache_update (signo); |
d4f3574e SS |
8448 | return ret; |
8449 | } | |
8450 | ||
488f131b | 8451 | int |
7bda5e4a | 8452 | signal_print_update (int signo, int state) |
d4f3574e SS |
8453 | { |
8454 | int ret = signal_print[signo]; | |
abbb1732 | 8455 | |
d4f3574e | 8456 | signal_print[signo] = state; |
2455069d | 8457 | signal_cache_update (signo); |
d4f3574e SS |
8458 | return ret; |
8459 | } | |
8460 | ||
488f131b | 8461 | int |
7bda5e4a | 8462 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8463 | { |
8464 | int ret = signal_program[signo]; | |
abbb1732 | 8465 | |
d4f3574e | 8466 | signal_program[signo] = state; |
2455069d | 8467 | signal_cache_update (signo); |
d4f3574e SS |
8468 | return ret; |
8469 | } | |
8470 | ||
ab04a2af TT |
8471 | /* Update the global 'signal_catch' from INFO and notify the |
8472 | target. */ | |
8473 | ||
8474 | void | |
8475 | signal_catch_update (const unsigned int *info) | |
8476 | { | |
8477 | int i; | |
8478 | ||
8479 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8480 | signal_catch[i] = info[i] > 0; | |
8481 | signal_cache_update (-1); | |
8482 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
8483 | } | |
8484 | ||
c906108c | 8485 | static void |
96baa820 | 8486 | sig_print_header (void) |
c906108c | 8487 | { |
3e43a32a MS |
8488 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8489 | "to program\tDescription\n")); | |
c906108c SS |
8490 | } |
8491 | ||
8492 | static void | |
2ea28649 | 8493 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8494 | { |
2ea28649 | 8495 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8496 | int name_padding = 13 - strlen (name); |
96baa820 | 8497 | |
c906108c SS |
8498 | if (name_padding <= 0) |
8499 | name_padding = 0; | |
8500 | ||
8501 | printf_filtered ("%s", name); | |
488f131b | 8502 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8503 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8504 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8505 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8506 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8507 | } |
8508 | ||
8509 | /* Specify how various signals in the inferior should be handled. */ | |
8510 | ||
8511 | static void | |
96baa820 | 8512 | handle_command (char *args, int from_tty) |
c906108c SS |
8513 | { |
8514 | char **argv; | |
8515 | int digits, wordlen; | |
8516 | int sigfirst, signum, siglast; | |
2ea28649 | 8517 | enum gdb_signal oursig; |
c906108c SS |
8518 | int allsigs; |
8519 | int nsigs; | |
8520 | unsigned char *sigs; | |
8521 | struct cleanup *old_chain; | |
8522 | ||
8523 | if (args == NULL) | |
8524 | { | |
e2e0b3e5 | 8525 | error_no_arg (_("signal to handle")); |
c906108c SS |
8526 | } |
8527 | ||
1777feb0 | 8528 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8529 | |
a493e3e2 | 8530 | nsigs = (int) GDB_SIGNAL_LAST; |
c906108c SS |
8531 | sigs = (unsigned char *) alloca (nsigs); |
8532 | memset (sigs, 0, nsigs); | |
8533 | ||
1777feb0 | 8534 | /* Break the command line up into args. */ |
c906108c | 8535 | |
d1a41061 | 8536 | argv = gdb_buildargv (args); |
7a292a7a | 8537 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
8538 | |
8539 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8540 | actions. Signal numbers and signal names may be interspersed with | |
8541 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8542 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c SS |
8543 | |
8544 | while (*argv != NULL) | |
8545 | { | |
8546 | wordlen = strlen (*argv); | |
8547 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
8548 | {; | |
8549 | } | |
8550 | allsigs = 0; | |
8551 | sigfirst = siglast = -1; | |
8552 | ||
8553 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
8554 | { | |
8555 | /* Apply action to all signals except those used by the | |
1777feb0 | 8556 | debugger. Silently skip those. */ |
c906108c SS |
8557 | allsigs = 1; |
8558 | sigfirst = 0; | |
8559 | siglast = nsigs - 1; | |
8560 | } | |
8561 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
8562 | { | |
8563 | SET_SIGS (nsigs, sigs, signal_stop); | |
8564 | SET_SIGS (nsigs, sigs, signal_print); | |
8565 | } | |
8566 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
8567 | { | |
8568 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8569 | } | |
8570 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
8571 | { | |
8572 | SET_SIGS (nsigs, sigs, signal_print); | |
8573 | } | |
8574 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
8575 | { | |
8576 | SET_SIGS (nsigs, sigs, signal_program); | |
8577 | } | |
8578 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
8579 | { | |
8580 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8581 | } | |
8582 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
8583 | { | |
8584 | SET_SIGS (nsigs, sigs, signal_program); | |
8585 | } | |
8586 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
8587 | { | |
8588 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8589 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8590 | } | |
8591 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
8592 | { | |
8593 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8594 | } | |
8595 | else if (digits > 0) | |
8596 | { | |
8597 | /* It is numeric. The numeric signal refers to our own | |
8598 | internal signal numbering from target.h, not to host/target | |
8599 | signal number. This is a feature; users really should be | |
8600 | using symbolic names anyway, and the common ones like | |
8601 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8602 | ||
8603 | sigfirst = siglast = (int) | |
2ea28649 | 8604 | gdb_signal_from_command (atoi (*argv)); |
c906108c SS |
8605 | if ((*argv)[digits] == '-') |
8606 | { | |
8607 | siglast = (int) | |
2ea28649 | 8608 | gdb_signal_from_command (atoi ((*argv) + digits + 1)); |
c906108c SS |
8609 | } |
8610 | if (sigfirst > siglast) | |
8611 | { | |
1777feb0 | 8612 | /* Bet he didn't figure we'd think of this case... */ |
c906108c SS |
8613 | signum = sigfirst; |
8614 | sigfirst = siglast; | |
8615 | siglast = signum; | |
8616 | } | |
8617 | } | |
8618 | else | |
8619 | { | |
2ea28649 | 8620 | oursig = gdb_signal_from_name (*argv); |
a493e3e2 | 8621 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8622 | { |
8623 | sigfirst = siglast = (int) oursig; | |
8624 | } | |
8625 | else | |
8626 | { | |
8627 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 8628 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
8629 | } |
8630 | } | |
8631 | ||
8632 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8633 | which signals to apply actions to. */ |
c906108c SS |
8634 | |
8635 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
8636 | { | |
2ea28649 | 8637 | switch ((enum gdb_signal) signum) |
c906108c | 8638 | { |
a493e3e2 PA |
8639 | case GDB_SIGNAL_TRAP: |
8640 | case GDB_SIGNAL_INT: | |
c906108c SS |
8641 | if (!allsigs && !sigs[signum]) |
8642 | { | |
9e2f0ad4 | 8643 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8644 | Are you sure you want to change it? "), |
2ea28649 | 8645 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8646 | { |
8647 | sigs[signum] = 1; | |
8648 | } | |
8649 | else | |
8650 | { | |
a3f17187 | 8651 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8652 | gdb_flush (gdb_stdout); |
8653 | } | |
8654 | } | |
8655 | break; | |
a493e3e2 PA |
8656 | case GDB_SIGNAL_0: |
8657 | case GDB_SIGNAL_DEFAULT: | |
8658 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8659 | /* Make sure that "all" doesn't print these. */ |
8660 | break; | |
8661 | default: | |
8662 | sigs[signum] = 1; | |
8663 | break; | |
8664 | } | |
8665 | } | |
8666 | ||
8667 | argv++; | |
8668 | } | |
8669 | ||
3a031f65 PA |
8670 | for (signum = 0; signum < nsigs; signum++) |
8671 | if (sigs[signum]) | |
8672 | { | |
2455069d | 8673 | signal_cache_update (-1); |
a493e3e2 PA |
8674 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); |
8675 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); | |
c906108c | 8676 | |
3a031f65 PA |
8677 | if (from_tty) |
8678 | { | |
8679 | /* Show the results. */ | |
8680 | sig_print_header (); | |
8681 | for (; signum < nsigs; signum++) | |
8682 | if (sigs[signum]) | |
aead7601 | 8683 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8684 | } |
8685 | ||
8686 | break; | |
8687 | } | |
c906108c SS |
8688 | |
8689 | do_cleanups (old_chain); | |
8690 | } | |
8691 | ||
de0bea00 MF |
8692 | /* Complete the "handle" command. */ |
8693 | ||
eb3ff9a5 | 8694 | static void |
de0bea00 | 8695 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8696 | completion_tracker &tracker, |
6f937416 | 8697 | const char *text, const char *word) |
de0bea00 | 8698 | { |
de0bea00 MF |
8699 | static const char * const keywords[] = |
8700 | { | |
8701 | "all", | |
8702 | "stop", | |
8703 | "ignore", | |
8704 | "print", | |
8705 | "pass", | |
8706 | "nostop", | |
8707 | "noignore", | |
8708 | "noprint", | |
8709 | "nopass", | |
8710 | NULL, | |
8711 | }; | |
8712 | ||
eb3ff9a5 PA |
8713 | signal_completer (ignore, tracker, text, word); |
8714 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8715 | } |
8716 | ||
2ea28649 PA |
8717 | enum gdb_signal |
8718 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8719 | { |
8720 | if (num >= 1 && num <= 15) | |
2ea28649 | 8721 | return (enum gdb_signal) num; |
ed01b82c PA |
8722 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8723 | Use \"info signals\" for a list of symbolic signals.")); | |
8724 | } | |
8725 | ||
c906108c SS |
8726 | /* Print current contents of the tables set by the handle command. |
8727 | It is possible we should just be printing signals actually used | |
8728 | by the current target (but for things to work right when switching | |
8729 | targets, all signals should be in the signal tables). */ | |
8730 | ||
8731 | static void | |
96baa820 | 8732 | signals_info (char *signum_exp, int from_tty) |
c906108c | 8733 | { |
2ea28649 | 8734 | enum gdb_signal oursig; |
abbb1732 | 8735 | |
c906108c SS |
8736 | sig_print_header (); |
8737 | ||
8738 | if (signum_exp) | |
8739 | { | |
8740 | /* First see if this is a symbol name. */ | |
2ea28649 | 8741 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8742 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8743 | { |
8744 | /* No, try numeric. */ | |
8745 | oursig = | |
2ea28649 | 8746 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8747 | } |
8748 | sig_print_info (oursig); | |
8749 | return; | |
8750 | } | |
8751 | ||
8752 | printf_filtered ("\n"); | |
8753 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8754 | for (oursig = GDB_SIGNAL_FIRST; |
8755 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8756 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8757 | { |
8758 | QUIT; | |
8759 | ||
a493e3e2 PA |
8760 | if (oursig != GDB_SIGNAL_UNKNOWN |
8761 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8762 | sig_print_info (oursig); |
8763 | } | |
8764 | ||
3e43a32a MS |
8765 | printf_filtered (_("\nUse the \"handle\" command " |
8766 | "to change these tables.\n")); | |
c906108c | 8767 | } |
4aa995e1 PA |
8768 | |
8769 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8770 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8771 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8772 | also dependent on which thread you have selected. |
8773 | ||
8774 | 1. making $_siginfo be an internalvar that creates a new value on | |
8775 | access. | |
8776 | ||
8777 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8778 | ||
8779 | /* This function implements the lval_computed support for reading a | |
8780 | $_siginfo value. */ | |
8781 | ||
8782 | static void | |
8783 | siginfo_value_read (struct value *v) | |
8784 | { | |
8785 | LONGEST transferred; | |
8786 | ||
a911d87a PA |
8787 | /* If we can access registers, so can we access $_siginfo. Likewise |
8788 | vice versa. */ | |
8789 | validate_registers_access (); | |
c709acd1 | 8790 | |
4aa995e1 PA |
8791 | transferred = |
8792 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
8793 | NULL, | |
8794 | value_contents_all_raw (v), | |
8795 | value_offset (v), | |
8796 | TYPE_LENGTH (value_type (v))); | |
8797 | ||
8798 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8799 | error (_("Unable to read siginfo")); | |
8800 | } | |
8801 | ||
8802 | /* This function implements the lval_computed support for writing a | |
8803 | $_siginfo value. */ | |
8804 | ||
8805 | static void | |
8806 | siginfo_value_write (struct value *v, struct value *fromval) | |
8807 | { | |
8808 | LONGEST transferred; | |
8809 | ||
a911d87a PA |
8810 | /* If we can access registers, so can we access $_siginfo. Likewise |
8811 | vice versa. */ | |
8812 | validate_registers_access (); | |
c709acd1 | 8813 | |
4aa995e1 PA |
8814 | transferred = target_write (¤t_target, |
8815 | TARGET_OBJECT_SIGNAL_INFO, | |
8816 | NULL, | |
8817 | value_contents_all_raw (fromval), | |
8818 | value_offset (v), | |
8819 | TYPE_LENGTH (value_type (fromval))); | |
8820 | ||
8821 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8822 | error (_("Unable to write siginfo")); | |
8823 | } | |
8824 | ||
c8f2448a | 8825 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8826 | { |
8827 | siginfo_value_read, | |
8828 | siginfo_value_write | |
8829 | }; | |
8830 | ||
8831 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8832 | the current thread using architecture GDBARCH. Return a void value |
8833 | if there's no object available. */ | |
4aa995e1 | 8834 | |
2c0b251b | 8835 | static struct value * |
22d2b532 SDJ |
8836 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8837 | void *ignore) | |
4aa995e1 | 8838 | { |
4aa995e1 | 8839 | if (target_has_stack |
78267919 UW |
8840 | && !ptid_equal (inferior_ptid, null_ptid) |
8841 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
4aa995e1 | 8842 | { |
78267919 | 8843 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8844 | |
78267919 | 8845 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8846 | } |
8847 | ||
78267919 | 8848 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8849 | } |
8850 | ||
c906108c | 8851 | \f |
16c381f0 JK |
8852 | /* infcall_suspend_state contains state about the program itself like its |
8853 | registers and any signal it received when it last stopped. | |
8854 | This state must be restored regardless of how the inferior function call | |
8855 | ends (either successfully, or after it hits a breakpoint or signal) | |
8856 | if the program is to properly continue where it left off. */ | |
8857 | ||
8858 | struct infcall_suspend_state | |
7a292a7a | 8859 | { |
16c381f0 | 8860 | struct thread_suspend_state thread_suspend; |
16c381f0 JK |
8861 | |
8862 | /* Other fields: */ | |
7a292a7a | 8863 | CORE_ADDR stop_pc; |
b89667eb | 8864 | struct regcache *registers; |
1736ad11 | 8865 | |
35515841 | 8866 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
1736ad11 JK |
8867 | struct gdbarch *siginfo_gdbarch; |
8868 | ||
8869 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8870 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8871 | content would be invalid. */ | |
8872 | gdb_byte *siginfo_data; | |
b89667eb DE |
8873 | }; |
8874 | ||
16c381f0 JK |
8875 | struct infcall_suspend_state * |
8876 | save_infcall_suspend_state (void) | |
b89667eb | 8877 | { |
16c381f0 | 8878 | struct infcall_suspend_state *inf_state; |
b89667eb | 8879 | struct thread_info *tp = inferior_thread (); |
1736ad11 JK |
8880 | struct regcache *regcache = get_current_regcache (); |
8881 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
8882 | gdb_byte *siginfo_data = NULL; | |
8883 | ||
8884 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8885 | { | |
8886 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8887 | size_t len = TYPE_LENGTH (type); | |
8888 | struct cleanup *back_to; | |
8889 | ||
224c3ddb | 8890 | siginfo_data = (gdb_byte *) xmalloc (len); |
1736ad11 JK |
8891 | back_to = make_cleanup (xfree, siginfo_data); |
8892 | ||
8893 | if (target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8894 | siginfo_data, 0, len) == len) | |
8895 | discard_cleanups (back_to); | |
8896 | else | |
8897 | { | |
8898 | /* Errors ignored. */ | |
8899 | do_cleanups (back_to); | |
8900 | siginfo_data = NULL; | |
8901 | } | |
8902 | } | |
8903 | ||
41bf6aca | 8904 | inf_state = XCNEW (struct infcall_suspend_state); |
1736ad11 JK |
8905 | |
8906 | if (siginfo_data) | |
8907 | { | |
8908 | inf_state->siginfo_gdbarch = gdbarch; | |
8909 | inf_state->siginfo_data = siginfo_data; | |
8910 | } | |
b89667eb | 8911 | |
16c381f0 | 8912 | inf_state->thread_suspend = tp->suspend; |
16c381f0 | 8913 | |
35515841 | 8914 | /* run_inferior_call will not use the signal due to its `proceed' call with |
a493e3e2 PA |
8915 | GDB_SIGNAL_0 anyway. */ |
8916 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
35515841 | 8917 | |
b89667eb DE |
8918 | inf_state->stop_pc = stop_pc; |
8919 | ||
1736ad11 | 8920 | inf_state->registers = regcache_dup (regcache); |
b89667eb DE |
8921 | |
8922 | return inf_state; | |
8923 | } | |
8924 | ||
8925 | /* Restore inferior session state to INF_STATE. */ | |
8926 | ||
8927 | void | |
16c381f0 | 8928 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8929 | { |
8930 | struct thread_info *tp = inferior_thread (); | |
1736ad11 JK |
8931 | struct regcache *regcache = get_current_regcache (); |
8932 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
b89667eb | 8933 | |
16c381f0 | 8934 | tp->suspend = inf_state->thread_suspend; |
16c381f0 | 8935 | |
b89667eb DE |
8936 | stop_pc = inf_state->stop_pc; |
8937 | ||
1736ad11 JK |
8938 | if (inf_state->siginfo_gdbarch == gdbarch) |
8939 | { | |
8940 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
1736ad11 JK |
8941 | |
8942 | /* Errors ignored. */ | |
8943 | target_write (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6acef6cd | 8944 | inf_state->siginfo_data, 0, TYPE_LENGTH (type)); |
1736ad11 JK |
8945 | } |
8946 | ||
b89667eb DE |
8947 | /* The inferior can be gone if the user types "print exit(0)" |
8948 | (and perhaps other times). */ | |
8949 | if (target_has_execution) | |
8950 | /* NB: The register write goes through to the target. */ | |
1736ad11 | 8951 | regcache_cpy (regcache, inf_state->registers); |
803b5f95 | 8952 | |
16c381f0 | 8953 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8954 | } |
8955 | ||
8956 | static void | |
16c381f0 | 8957 | do_restore_infcall_suspend_state_cleanup (void *state) |
b89667eb | 8958 | { |
9a3c8263 | 8959 | restore_infcall_suspend_state ((struct infcall_suspend_state *) state); |
b89667eb DE |
8960 | } |
8961 | ||
8962 | struct cleanup * | |
16c381f0 JK |
8963 | make_cleanup_restore_infcall_suspend_state |
8964 | (struct infcall_suspend_state *inf_state) | |
b89667eb | 8965 | { |
16c381f0 | 8966 | return make_cleanup (do_restore_infcall_suspend_state_cleanup, inf_state); |
b89667eb DE |
8967 | } |
8968 | ||
8969 | void | |
16c381f0 | 8970 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8971 | { |
8972 | regcache_xfree (inf_state->registers); | |
803b5f95 | 8973 | xfree (inf_state->siginfo_data); |
b89667eb DE |
8974 | xfree (inf_state); |
8975 | } | |
8976 | ||
8977 | struct regcache * | |
16c381f0 | 8978 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8979 | { |
8980 | return inf_state->registers; | |
8981 | } | |
8982 | ||
16c381f0 JK |
8983 | /* infcall_control_state contains state regarding gdb's control of the |
8984 | inferior itself like stepping control. It also contains session state like | |
8985 | the user's currently selected frame. */ | |
b89667eb | 8986 | |
16c381f0 | 8987 | struct infcall_control_state |
b89667eb | 8988 | { |
16c381f0 JK |
8989 | struct thread_control_state thread_control; |
8990 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
8991 | |
8992 | /* Other fields: */ | |
8993 | enum stop_stack_kind stop_stack_dummy; | |
8994 | int stopped_by_random_signal; | |
7a292a7a | 8995 | |
b89667eb | 8996 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe | 8997 | struct frame_id selected_frame_id; |
7a292a7a SS |
8998 | }; |
8999 | ||
c906108c | 9000 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9001 | connection. */ |
c906108c | 9002 | |
16c381f0 JK |
9003 | struct infcall_control_state * |
9004 | save_infcall_control_state (void) | |
c906108c | 9005 | { |
8d749320 SM |
9006 | struct infcall_control_state *inf_status = |
9007 | XNEW (struct infcall_control_state); | |
4e1c45ea | 9008 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9009 | struct inferior *inf = current_inferior (); |
7a292a7a | 9010 | |
16c381f0 JK |
9011 | inf_status->thread_control = tp->control; |
9012 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9013 | |
8358c15c | 9014 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9015 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9016 | |
16c381f0 JK |
9017 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9018 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9019 | hand them back the original chain when restore_infcall_control_state is | |
9020 | called. */ | |
9021 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9022 | |
9023 | /* Other fields: */ | |
9024 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9025 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9026 | |
206415a3 | 9027 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 9028 | |
7a292a7a | 9029 | return inf_status; |
c906108c SS |
9030 | } |
9031 | ||
c906108c | 9032 | static int |
96baa820 | 9033 | restore_selected_frame (void *args) |
c906108c | 9034 | { |
488f131b | 9035 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 9036 | struct frame_info *frame; |
c906108c | 9037 | |
101dcfbe | 9038 | frame = frame_find_by_id (*fid); |
c906108c | 9039 | |
aa0cd9c1 AC |
9040 | /* If inf_status->selected_frame_id is NULL, there was no previously |
9041 | selected frame. */ | |
101dcfbe | 9042 | if (frame == NULL) |
c906108c | 9043 | { |
8a3fe4f8 | 9044 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
9045 | return 0; |
9046 | } | |
9047 | ||
0f7d239c | 9048 | select_frame (frame); |
c906108c SS |
9049 | |
9050 | return (1); | |
9051 | } | |
9052 | ||
b89667eb DE |
9053 | /* Restore inferior session state to INF_STATUS. */ |
9054 | ||
c906108c | 9055 | void |
16c381f0 | 9056 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9057 | { |
4e1c45ea | 9058 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9059 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9060 | |
8358c15c JK |
9061 | if (tp->control.step_resume_breakpoint) |
9062 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9063 | ||
5b79abe7 TT |
9064 | if (tp->control.exception_resume_breakpoint) |
9065 | tp->control.exception_resume_breakpoint->disposition | |
9066 | = disp_del_at_next_stop; | |
9067 | ||
d82142e2 | 9068 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9069 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9070 | |
16c381f0 JK |
9071 | tp->control = inf_status->thread_control; |
9072 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9073 | |
9074 | /* Other fields: */ | |
9075 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9076 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9077 | |
b89667eb | 9078 | if (target_has_stack) |
c906108c | 9079 | { |
c906108c | 9080 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
9081 | walking the stack might encounter a garbage pointer and |
9082 | error() trying to dereference it. */ | |
488f131b JB |
9083 | if (catch_errors |
9084 | (restore_selected_frame, &inf_status->selected_frame_id, | |
9085 | "Unable to restore previously selected frame:\n", | |
9086 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
9087 | /* Error in restoring the selected frame. Select the innermost |
9088 | frame. */ | |
0f7d239c | 9089 | select_frame (get_current_frame ()); |
c906108c | 9090 | } |
c906108c | 9091 | |
72cec141 | 9092 | xfree (inf_status); |
7a292a7a | 9093 | } |
c906108c | 9094 | |
74b7792f | 9095 | static void |
16c381f0 | 9096 | do_restore_infcall_control_state_cleanup (void *sts) |
74b7792f | 9097 | { |
9a3c8263 | 9098 | restore_infcall_control_state ((struct infcall_control_state *) sts); |
74b7792f AC |
9099 | } |
9100 | ||
9101 | struct cleanup * | |
16c381f0 JK |
9102 | make_cleanup_restore_infcall_control_state |
9103 | (struct infcall_control_state *inf_status) | |
74b7792f | 9104 | { |
16c381f0 | 9105 | return make_cleanup (do_restore_infcall_control_state_cleanup, inf_status); |
74b7792f AC |
9106 | } |
9107 | ||
c906108c | 9108 | void |
16c381f0 | 9109 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9110 | { |
8358c15c JK |
9111 | if (inf_status->thread_control.step_resume_breakpoint) |
9112 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9113 | = disp_del_at_next_stop; | |
9114 | ||
5b79abe7 TT |
9115 | if (inf_status->thread_control.exception_resume_breakpoint) |
9116 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9117 | = disp_del_at_next_stop; | |
9118 | ||
1777feb0 | 9119 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9120 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9121 | |
72cec141 | 9122 | xfree (inf_status); |
7a292a7a | 9123 | } |
b89667eb | 9124 | \f |
ca6724c1 KB |
9125 | /* restore_inferior_ptid() will be used by the cleanup machinery |
9126 | to restore the inferior_ptid value saved in a call to | |
9127 | save_inferior_ptid(). */ | |
ce696e05 KB |
9128 | |
9129 | static void | |
9130 | restore_inferior_ptid (void *arg) | |
9131 | { | |
9a3c8263 | 9132 | ptid_t *saved_ptid_ptr = (ptid_t *) arg; |
abbb1732 | 9133 | |
ce696e05 KB |
9134 | inferior_ptid = *saved_ptid_ptr; |
9135 | xfree (arg); | |
9136 | } | |
9137 | ||
9138 | /* Save the value of inferior_ptid so that it may be restored by a | |
9139 | later call to do_cleanups(). Returns the struct cleanup pointer | |
9140 | needed for later doing the cleanup. */ | |
9141 | ||
9142 | struct cleanup * | |
9143 | save_inferior_ptid (void) | |
9144 | { | |
8d749320 | 9145 | ptid_t *saved_ptid_ptr = XNEW (ptid_t); |
ce696e05 | 9146 | |
ce696e05 KB |
9147 | *saved_ptid_ptr = inferior_ptid; |
9148 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
9149 | } | |
0c557179 | 9150 | |
7f89fd65 | 9151 | /* See infrun.h. */ |
0c557179 SDJ |
9152 | |
9153 | void | |
9154 | clear_exit_convenience_vars (void) | |
9155 | { | |
9156 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9157 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9158 | } | |
c5aa993b | 9159 | \f |
488f131b | 9160 | |
b2175913 MS |
9161 | /* User interface for reverse debugging: |
9162 | Set exec-direction / show exec-direction commands | |
9163 | (returns error unless target implements to_set_exec_direction method). */ | |
9164 | ||
170742de | 9165 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9166 | static const char exec_forward[] = "forward"; |
9167 | static const char exec_reverse[] = "reverse"; | |
9168 | static const char *exec_direction = exec_forward; | |
40478521 | 9169 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9170 | exec_forward, |
9171 | exec_reverse, | |
9172 | NULL | |
9173 | }; | |
9174 | ||
9175 | static void | |
9176 | set_exec_direction_func (char *args, int from_tty, | |
9177 | struct cmd_list_element *cmd) | |
9178 | { | |
9179 | if (target_can_execute_reverse) | |
9180 | { | |
9181 | if (!strcmp (exec_direction, exec_forward)) | |
9182 | execution_direction = EXEC_FORWARD; | |
9183 | else if (!strcmp (exec_direction, exec_reverse)) | |
9184 | execution_direction = EXEC_REVERSE; | |
9185 | } | |
8bbed405 MS |
9186 | else |
9187 | { | |
9188 | exec_direction = exec_forward; | |
9189 | error (_("Target does not support this operation.")); | |
9190 | } | |
b2175913 MS |
9191 | } |
9192 | ||
9193 | static void | |
9194 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9195 | struct cmd_list_element *cmd, const char *value) | |
9196 | { | |
9197 | switch (execution_direction) { | |
9198 | case EXEC_FORWARD: | |
9199 | fprintf_filtered (out, _("Forward.\n")); | |
9200 | break; | |
9201 | case EXEC_REVERSE: | |
9202 | fprintf_filtered (out, _("Reverse.\n")); | |
9203 | break; | |
b2175913 | 9204 | default: |
d8b34453 PA |
9205 | internal_error (__FILE__, __LINE__, |
9206 | _("bogus execution_direction value: %d"), | |
9207 | (int) execution_direction); | |
b2175913 MS |
9208 | } |
9209 | } | |
9210 | ||
d4db2f36 PA |
9211 | static void |
9212 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9213 | struct cmd_list_element *c, const char *value) | |
9214 | { | |
3e43a32a MS |
9215 | fprintf_filtered (file, _("Resuming the execution of threads " |
9216 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9217 | } |
ad52ddc6 | 9218 | |
22d2b532 SDJ |
9219 | /* Implementation of `siginfo' variable. */ |
9220 | ||
9221 | static const struct internalvar_funcs siginfo_funcs = | |
9222 | { | |
9223 | siginfo_make_value, | |
9224 | NULL, | |
9225 | NULL | |
9226 | }; | |
9227 | ||
372316f1 PA |
9228 | /* Callback for infrun's target events source. This is marked when a |
9229 | thread has a pending status to process. */ | |
9230 | ||
9231 | static void | |
9232 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9233 | { | |
372316f1 PA |
9234 | inferior_event_handler (INF_REG_EVENT, NULL); |
9235 | } | |
9236 | ||
c906108c | 9237 | void |
96baa820 | 9238 | _initialize_infrun (void) |
c906108c | 9239 | { |
52f0bd74 AC |
9240 | int i; |
9241 | int numsigs; | |
de0bea00 | 9242 | struct cmd_list_element *c; |
c906108c | 9243 | |
372316f1 PA |
9244 | /* Register extra event sources in the event loop. */ |
9245 | infrun_async_inferior_event_token | |
9246 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
9247 | ||
1bedd215 AC |
9248 | add_info ("signals", signals_info, _("\ |
9249 | What debugger does when program gets various signals.\n\ | |
9250 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9251 | add_info_alias ("handle", "signals", 0); |
9252 | ||
de0bea00 | 9253 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9254 | Specify how to handle signals.\n\ |
486c7739 | 9255 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9256 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9257 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9258 | will be displayed instead.\n\ |
9259 | \n\ | |
c906108c SS |
9260 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9261 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9262 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9263 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9264 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9265 | \n\ |
1bedd215 | 9266 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9267 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9268 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9269 | Print means print a message if this signal happens.\n\ | |
9270 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9271 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9272 | Pass and Stop may be combined.\n\ |
9273 | \n\ | |
9274 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9275 | may be interspersed with actions, with the actions being performed for\n\ | |
9276 | all signals cumulatively specified.")); | |
de0bea00 | 9277 | set_cmd_completer (c, handle_completer); |
486c7739 | 9278 | |
c906108c | 9279 | if (!dbx_commands) |
1a966eab AC |
9280 | stop_command = add_cmd ("stop", class_obscure, |
9281 | not_just_help_class_command, _("\ | |
9282 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9283 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9284 | of the program stops."), &cmdlist); |
c906108c | 9285 | |
ccce17b0 | 9286 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9287 | Set inferior debugging."), _("\ |
9288 | Show inferior debugging."), _("\ | |
9289 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9290 | NULL, |
9291 | show_debug_infrun, | |
9292 | &setdebuglist, &showdebuglist); | |
527159b7 | 9293 | |
3e43a32a MS |
9294 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9295 | &debug_displaced, _("\ | |
237fc4c9 PA |
9296 | Set displaced stepping debugging."), _("\ |
9297 | Show displaced stepping debugging."), _("\ | |
9298 | When non-zero, displaced stepping specific debugging is enabled."), | |
9299 | NULL, | |
9300 | show_debug_displaced, | |
9301 | &setdebuglist, &showdebuglist); | |
9302 | ||
ad52ddc6 PA |
9303 | add_setshow_boolean_cmd ("non-stop", no_class, |
9304 | &non_stop_1, _("\ | |
9305 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9306 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9307 | When debugging a multi-threaded program and this setting is\n\ | |
9308 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9309 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9310 | all other threads in the program while you interact with the thread of\n\ | |
9311 | interest. When you continue or step a thread, you can allow the other\n\ | |
9312 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9313 | thread's state, all threads stop.\n\ | |
9314 | \n\ | |
9315 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9316 | to run freely. You'll be able to step each thread independently,\n\ | |
9317 | leave it stopped or free to run as needed."), | |
9318 | set_non_stop, | |
9319 | show_non_stop, | |
9320 | &setlist, | |
9321 | &showlist); | |
9322 | ||
a493e3e2 | 9323 | numsigs = (int) GDB_SIGNAL_LAST; |
8d749320 SM |
9324 | signal_stop = XNEWVEC (unsigned char, numsigs); |
9325 | signal_print = XNEWVEC (unsigned char, numsigs); | |
9326 | signal_program = XNEWVEC (unsigned char, numsigs); | |
9327 | signal_catch = XNEWVEC (unsigned char, numsigs); | |
9328 | signal_pass = XNEWVEC (unsigned char, numsigs); | |
c906108c SS |
9329 | for (i = 0; i < numsigs; i++) |
9330 | { | |
9331 | signal_stop[i] = 1; | |
9332 | signal_print[i] = 1; | |
9333 | signal_program[i] = 1; | |
ab04a2af | 9334 | signal_catch[i] = 0; |
c906108c SS |
9335 | } |
9336 | ||
4d9d9d04 PA |
9337 | /* Signals caused by debugger's own actions should not be given to |
9338 | the program afterwards. | |
9339 | ||
9340 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9341 | explicitly specifies that it should be delivered to the target | |
9342 | program. Typically, that would occur when a user is debugging a | |
9343 | target monitor on a simulator: the target monitor sets a | |
9344 | breakpoint; the simulator encounters this breakpoint and halts | |
9345 | the simulation handing control to GDB; GDB, noting that the stop | |
9346 | address doesn't map to any known breakpoint, returns control back | |
9347 | to the simulator; the simulator then delivers the hardware | |
9348 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9349 | debugged. */ | |
a493e3e2 PA |
9350 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9351 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9352 | |
9353 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9354 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9355 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9356 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9357 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9358 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9359 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9360 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9361 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9362 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9363 | signal_print[GDB_SIGNAL_IO] = 0; | |
9364 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9365 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9366 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9367 | signal_print[GDB_SIGNAL_URG] = 0; | |
9368 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9369 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9370 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9371 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9372 | |
cd0fc7c3 SS |
9373 | /* These signals are used internally by user-level thread |
9374 | implementations. (See signal(5) on Solaris.) Like the above | |
9375 | signals, a healthy program receives and handles them as part of | |
9376 | its normal operation. */ | |
a493e3e2 PA |
9377 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9378 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9379 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9380 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9381 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9382 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9383 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9384 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9385 | |
2455069d UW |
9386 | /* Update cached state. */ |
9387 | signal_cache_update (-1); | |
9388 | ||
85c07804 AC |
9389 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9390 | &stop_on_solib_events, _("\ | |
9391 | Set stopping for shared library events."), _("\ | |
9392 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9393 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9394 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9395 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9396 | set_stop_on_solib_events, |
920d2a44 | 9397 | show_stop_on_solib_events, |
85c07804 | 9398 | &setlist, &showlist); |
c906108c | 9399 | |
7ab04401 AC |
9400 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9401 | follow_fork_mode_kind_names, | |
9402 | &follow_fork_mode_string, _("\ | |
9403 | Set debugger response to a program call of fork or vfork."), _("\ | |
9404 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9405 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9406 | parent - the original process is debugged after a fork\n\ | |
9407 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9408 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9409 | By default, the debugger will follow the parent process."), |
9410 | NULL, | |
920d2a44 | 9411 | show_follow_fork_mode_string, |
7ab04401 AC |
9412 | &setlist, &showlist); |
9413 | ||
6c95b8df PA |
9414 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9415 | follow_exec_mode_names, | |
9416 | &follow_exec_mode_string, _("\ | |
9417 | Set debugger response to a program call of exec."), _("\ | |
9418 | Show debugger response to a program call of exec."), _("\ | |
9419 | An exec call replaces the program image of a process.\n\ | |
9420 | \n\ | |
9421 | follow-exec-mode can be:\n\ | |
9422 | \n\ | |
cce7e648 | 9423 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9424 | to this new inferior. The program the process was running before\n\ |
9425 | the exec call can be restarted afterwards by restarting the original\n\ | |
9426 | inferior.\n\ | |
9427 | \n\ | |
9428 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9429 | The new executable image replaces the previous executable loaded in\n\ | |
9430 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9431 | the executable the process was running after the exec call.\n\ | |
9432 | \n\ | |
9433 | By default, the debugger will use the same inferior."), | |
9434 | NULL, | |
9435 | show_follow_exec_mode_string, | |
9436 | &setlist, &showlist); | |
9437 | ||
7ab04401 AC |
9438 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9439 | scheduler_enums, &scheduler_mode, _("\ | |
9440 | Set mode for locking scheduler during execution."), _("\ | |
9441 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9442 | off == no locking (threads may preempt at any time)\n\ |
9443 | on == full locking (no thread except the current thread may run)\n\ | |
9444 | This applies to both normal execution and replay mode.\n\ | |
9445 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9446 | In this mode, other threads may run during other commands.\n\ | |
9447 | This applies to both normal execution and replay mode.\n\ | |
9448 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9449 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9450 | show_scheduler_mode, |
7ab04401 | 9451 | &setlist, &showlist); |
5fbbeb29 | 9452 | |
d4db2f36 PA |
9453 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9454 | Set mode for resuming threads of all processes."), _("\ | |
9455 | Show mode for resuming threads of all processes."), _("\ | |
9456 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9457 | threads of all processes. When off (which is the default), execution\n\ | |
9458 | commands only resume the threads of the current process. The set of\n\ | |
9459 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9460 | mode (see help set scheduler-locking)."), | |
9461 | NULL, | |
9462 | show_schedule_multiple, | |
9463 | &setlist, &showlist); | |
9464 | ||
5bf193a2 AC |
9465 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9466 | Set mode of the step operation."), _("\ | |
9467 | Show mode of the step operation."), _("\ | |
9468 | When set, doing a step over a function without debug line information\n\ | |
9469 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9470 | function is skipped and the step command stops at a different source line."), | |
9471 | NULL, | |
920d2a44 | 9472 | show_step_stop_if_no_debug, |
5bf193a2 | 9473 | &setlist, &showlist); |
ca6724c1 | 9474 | |
72d0e2c5 YQ |
9475 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9476 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9477 | Set debugger's willingness to use displaced stepping."), _("\ |
9478 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9479 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9480 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9481 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9482 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9483 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9484 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9485 | NULL, |
9486 | show_can_use_displaced_stepping, | |
9487 | &setlist, &showlist); | |
237fc4c9 | 9488 | |
b2175913 MS |
9489 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9490 | &exec_direction, _("Set direction of execution.\n\ | |
9491 | Options are 'forward' or 'reverse'."), | |
9492 | _("Show direction of execution (forward/reverse)."), | |
9493 | _("Tells gdb whether to execute forward or backward."), | |
9494 | set_exec_direction_func, show_exec_direction_func, | |
9495 | &setlist, &showlist); | |
9496 | ||
6c95b8df PA |
9497 | /* Set/show detach-on-fork: user-settable mode. */ |
9498 | ||
9499 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9500 | Set whether gdb will detach the child of a fork."), _("\ | |
9501 | Show whether gdb will detach the child of a fork."), _("\ | |
9502 | Tells gdb whether to detach the child of a fork."), | |
9503 | NULL, NULL, &setlist, &showlist); | |
9504 | ||
03583c20 UW |
9505 | /* Set/show disable address space randomization mode. */ |
9506 | ||
9507 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9508 | &disable_randomization, _("\ | |
9509 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9510 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9511 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9512 | address space is disabled. Standalone programs run with the randomization\n\ | |
9513 | enabled by default on some platforms."), | |
9514 | &set_disable_randomization, | |
9515 | &show_disable_randomization, | |
9516 | &setlist, &showlist); | |
9517 | ||
ca6724c1 | 9518 | /* ptid initializations */ |
ca6724c1 KB |
9519 | inferior_ptid = null_ptid; |
9520 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd PA |
9521 | |
9522 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 9523 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 9524 | observer_attach_thread_exit (infrun_thread_thread_exit); |
fc1cf338 | 9525 | observer_attach_inferior_exit (infrun_inferior_exit); |
4aa995e1 PA |
9526 | |
9527 | /* Explicitly create without lookup, since that tries to create a | |
9528 | value with a void typed value, and when we get here, gdbarch | |
9529 | isn't initialized yet. At this point, we're quite sure there | |
9530 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9531 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9532 | |
9533 | add_setshow_boolean_cmd ("observer", no_class, | |
9534 | &observer_mode_1, _("\ | |
9535 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9536 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9537 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9538 | affect its execution. Registers and memory may not be changed,\n\ | |
9539 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9540 | or signalled."), | |
9541 | set_observer_mode, | |
9542 | show_observer_mode, | |
9543 | &setlist, | |
9544 | &showlist); | |
c906108c | 9545 | } |