Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
32d0add0 | 4 | Copyright (C) 1986-2015 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" |
c906108c SS |
65 | |
66 | /* Prototypes for local functions */ | |
67 | ||
96baa820 | 68 | static void signals_info (char *, int); |
c906108c | 69 | |
96baa820 | 70 | static void handle_command (char *, int); |
c906108c | 71 | |
2ea28649 | 72 | static void sig_print_info (enum gdb_signal); |
c906108c | 73 | |
96baa820 | 74 | static void sig_print_header (void); |
c906108c | 75 | |
74b7792f | 76 | static void resume_cleanups (void *); |
c906108c | 77 | |
96baa820 | 78 | static int hook_stop_stub (void *); |
c906108c | 79 | |
96baa820 JM |
80 | static int restore_selected_frame (void *); |
81 | ||
4ef3f3be | 82 | static int follow_fork (void); |
96baa820 | 83 | |
d83ad864 DB |
84 | static int follow_fork_inferior (int follow_child, int detach_fork); |
85 | ||
86 | static void follow_inferior_reset_breakpoints (void); | |
87 | ||
96baa820 | 88 | static void set_schedlock_func (char *args, int from_tty, |
488f131b | 89 | struct cmd_list_element *c); |
96baa820 | 90 | |
a289b8f6 JK |
91 | static int currently_stepping (struct thread_info *tp); |
92 | ||
96baa820 | 93 | void _initialize_infrun (void); |
43ff13b4 | 94 | |
e58b0e63 PA |
95 | void nullify_last_target_wait_ptid (void); |
96 | ||
2c03e5be | 97 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
98 | |
99 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
100 | ||
2484c66b UW |
101 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
102 | ||
8550d3b3 YQ |
103 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
104 | ||
372316f1 PA |
105 | /* Asynchronous signal handler registered as event loop source for |
106 | when we have pending events ready to be passed to the core. */ | |
107 | static struct async_event_handler *infrun_async_inferior_event_token; | |
108 | ||
109 | /* Stores whether infrun_async was previously enabled or disabled. | |
110 | Starts off as -1, indicating "never enabled/disabled". */ | |
111 | static int infrun_is_async = -1; | |
112 | ||
113 | /* See infrun.h. */ | |
114 | ||
115 | void | |
116 | infrun_async (int enable) | |
117 | { | |
118 | if (infrun_is_async != enable) | |
119 | { | |
120 | infrun_is_async = enable; | |
121 | ||
122 | if (debug_infrun) | |
123 | fprintf_unfiltered (gdb_stdlog, | |
124 | "infrun: infrun_async(%d)\n", | |
125 | enable); | |
126 | ||
127 | if (enable) | |
128 | mark_async_event_handler (infrun_async_inferior_event_token); | |
129 | else | |
130 | clear_async_event_handler (infrun_async_inferior_event_token); | |
131 | } | |
132 | } | |
133 | ||
5fbbeb29 CF |
134 | /* When set, stop the 'step' command if we enter a function which has |
135 | no line number information. The normal behavior is that we step | |
136 | over such function. */ | |
137 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
138 | static void |
139 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
140 | struct cmd_list_element *c, const char *value) | |
141 | { | |
142 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
143 | } | |
5fbbeb29 | 144 | |
1777feb0 | 145 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 146 | |
43ff13b4 JM |
147 | int sync_execution = 0; |
148 | ||
b9f437de PA |
149 | /* proceed and normal_stop use this to notify the user when the |
150 | inferior stopped in a different thread than it had been running | |
151 | in. */ | |
96baa820 | 152 | |
39f77062 | 153 | static ptid_t previous_inferior_ptid; |
7a292a7a | 154 | |
07107ca6 LM |
155 | /* If set (default for legacy reasons), when following a fork, GDB |
156 | will detach from one of the fork branches, child or parent. | |
157 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
158 | setting. */ | |
159 | ||
160 | static int detach_fork = 1; | |
6c95b8df | 161 | |
237fc4c9 PA |
162 | int debug_displaced = 0; |
163 | static void | |
164 | show_debug_displaced (struct ui_file *file, int from_tty, | |
165 | struct cmd_list_element *c, const char *value) | |
166 | { | |
167 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
168 | } | |
169 | ||
ccce17b0 | 170 | unsigned int debug_infrun = 0; |
920d2a44 AC |
171 | static void |
172 | show_debug_infrun (struct ui_file *file, int from_tty, | |
173 | struct cmd_list_element *c, const char *value) | |
174 | { | |
175 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
176 | } | |
527159b7 | 177 | |
03583c20 UW |
178 | |
179 | /* Support for disabling address space randomization. */ | |
180 | ||
181 | int disable_randomization = 1; | |
182 | ||
183 | static void | |
184 | show_disable_randomization (struct ui_file *file, int from_tty, | |
185 | struct cmd_list_element *c, const char *value) | |
186 | { | |
187 | if (target_supports_disable_randomization ()) | |
188 | fprintf_filtered (file, | |
189 | _("Disabling randomization of debuggee's " | |
190 | "virtual address space is %s.\n"), | |
191 | value); | |
192 | else | |
193 | fputs_filtered (_("Disabling randomization of debuggee's " | |
194 | "virtual address space is unsupported on\n" | |
195 | "this platform.\n"), file); | |
196 | } | |
197 | ||
198 | static void | |
199 | set_disable_randomization (char *args, int from_tty, | |
200 | struct cmd_list_element *c) | |
201 | { | |
202 | if (!target_supports_disable_randomization ()) | |
203 | error (_("Disabling randomization of debuggee's " | |
204 | "virtual address space is unsupported on\n" | |
205 | "this platform.")); | |
206 | } | |
207 | ||
d32dc48e PA |
208 | /* User interface for non-stop mode. */ |
209 | ||
210 | int non_stop = 0; | |
211 | static int non_stop_1 = 0; | |
212 | ||
213 | static void | |
214 | set_non_stop (char *args, int from_tty, | |
215 | struct cmd_list_element *c) | |
216 | { | |
217 | if (target_has_execution) | |
218 | { | |
219 | non_stop_1 = non_stop; | |
220 | error (_("Cannot change this setting while the inferior is running.")); | |
221 | } | |
222 | ||
223 | non_stop = non_stop_1; | |
224 | } | |
225 | ||
226 | static void | |
227 | show_non_stop (struct ui_file *file, int from_tty, | |
228 | struct cmd_list_element *c, const char *value) | |
229 | { | |
230 | fprintf_filtered (file, | |
231 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
232 | value); | |
233 | } | |
234 | ||
d914c394 SS |
235 | /* "Observer mode" is somewhat like a more extreme version of |
236 | non-stop, in which all GDB operations that might affect the | |
237 | target's execution have been disabled. */ | |
238 | ||
d914c394 SS |
239 | int observer_mode = 0; |
240 | static int observer_mode_1 = 0; | |
241 | ||
242 | static void | |
243 | set_observer_mode (char *args, int from_tty, | |
244 | struct cmd_list_element *c) | |
245 | { | |
d914c394 SS |
246 | if (target_has_execution) |
247 | { | |
248 | observer_mode_1 = observer_mode; | |
249 | error (_("Cannot change this setting while the inferior is running.")); | |
250 | } | |
251 | ||
252 | observer_mode = observer_mode_1; | |
253 | ||
254 | may_write_registers = !observer_mode; | |
255 | may_write_memory = !observer_mode; | |
256 | may_insert_breakpoints = !observer_mode; | |
257 | may_insert_tracepoints = !observer_mode; | |
258 | /* We can insert fast tracepoints in or out of observer mode, | |
259 | but enable them if we're going into this mode. */ | |
260 | if (observer_mode) | |
261 | may_insert_fast_tracepoints = 1; | |
262 | may_stop = !observer_mode; | |
263 | update_target_permissions (); | |
264 | ||
265 | /* Going *into* observer mode we must force non-stop, then | |
266 | going out we leave it that way. */ | |
267 | if (observer_mode) | |
268 | { | |
d914c394 SS |
269 | pagination_enabled = 0; |
270 | non_stop = non_stop_1 = 1; | |
271 | } | |
272 | ||
273 | if (from_tty) | |
274 | printf_filtered (_("Observer mode is now %s.\n"), | |
275 | (observer_mode ? "on" : "off")); | |
276 | } | |
277 | ||
278 | static void | |
279 | show_observer_mode (struct ui_file *file, int from_tty, | |
280 | struct cmd_list_element *c, const char *value) | |
281 | { | |
282 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
283 | } | |
284 | ||
285 | /* This updates the value of observer mode based on changes in | |
286 | permissions. Note that we are deliberately ignoring the values of | |
287 | may-write-registers and may-write-memory, since the user may have | |
288 | reason to enable these during a session, for instance to turn on a | |
289 | debugging-related global. */ | |
290 | ||
291 | void | |
292 | update_observer_mode (void) | |
293 | { | |
294 | int newval; | |
295 | ||
296 | newval = (!may_insert_breakpoints | |
297 | && !may_insert_tracepoints | |
298 | && may_insert_fast_tracepoints | |
299 | && !may_stop | |
300 | && non_stop); | |
301 | ||
302 | /* Let the user know if things change. */ | |
303 | if (newval != observer_mode) | |
304 | printf_filtered (_("Observer mode is now %s.\n"), | |
305 | (newval ? "on" : "off")); | |
306 | ||
307 | observer_mode = observer_mode_1 = newval; | |
308 | } | |
c2c6d25f | 309 | |
c906108c SS |
310 | /* Tables of how to react to signals; the user sets them. */ |
311 | ||
312 | static unsigned char *signal_stop; | |
313 | static unsigned char *signal_print; | |
314 | static unsigned char *signal_program; | |
315 | ||
ab04a2af TT |
316 | /* Table of signals that are registered with "catch signal". A |
317 | non-zero entry indicates that the signal is caught by some "catch | |
318 | signal" command. This has size GDB_SIGNAL_LAST, to accommodate all | |
319 | signals. */ | |
320 | static unsigned char *signal_catch; | |
321 | ||
2455069d UW |
322 | /* Table of signals that the target may silently handle. |
323 | This is automatically determined from the flags above, | |
324 | and simply cached here. */ | |
325 | static unsigned char *signal_pass; | |
326 | ||
c906108c SS |
327 | #define SET_SIGS(nsigs,sigs,flags) \ |
328 | do { \ | |
329 | int signum = (nsigs); \ | |
330 | while (signum-- > 0) \ | |
331 | if ((sigs)[signum]) \ | |
332 | (flags)[signum] = 1; \ | |
333 | } while (0) | |
334 | ||
335 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
336 | do { \ | |
337 | int signum = (nsigs); \ | |
338 | while (signum-- > 0) \ | |
339 | if ((sigs)[signum]) \ | |
340 | (flags)[signum] = 0; \ | |
341 | } while (0) | |
342 | ||
9b224c5e PA |
343 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
344 | this function is to avoid exporting `signal_program'. */ | |
345 | ||
346 | void | |
347 | update_signals_program_target (void) | |
348 | { | |
a493e3e2 | 349 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); |
9b224c5e PA |
350 | } |
351 | ||
1777feb0 | 352 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 353 | |
edb3359d | 354 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
355 | |
356 | /* Command list pointer for the "stop" placeholder. */ | |
357 | ||
358 | static struct cmd_list_element *stop_command; | |
359 | ||
c906108c SS |
360 | /* Nonzero if we want to give control to the user when we're notified |
361 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 362 | int stop_on_solib_events; |
f9e14852 GB |
363 | |
364 | /* Enable or disable optional shared library event breakpoints | |
365 | as appropriate when the above flag is changed. */ | |
366 | ||
367 | static void | |
368 | set_stop_on_solib_events (char *args, int from_tty, struct cmd_list_element *c) | |
369 | { | |
370 | update_solib_breakpoints (); | |
371 | } | |
372 | ||
920d2a44 AC |
373 | static void |
374 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
375 | struct cmd_list_element *c, const char *value) | |
376 | { | |
377 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
378 | value); | |
379 | } | |
c906108c | 380 | |
c906108c SS |
381 | /* Nonzero means expecting a trace trap |
382 | and should stop the inferior and return silently when it happens. */ | |
383 | ||
384 | int stop_after_trap; | |
385 | ||
c906108c SS |
386 | /* Nonzero after stop if current stack frame should be printed. */ |
387 | ||
388 | static int stop_print_frame; | |
389 | ||
e02bc4cc | 390 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
391 | returned by target_wait()/deprecated_target_wait_hook(). This |
392 | information is returned by get_last_target_status(). */ | |
39f77062 | 393 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
394 | static struct target_waitstatus target_last_waitstatus; |
395 | ||
0d1e5fa7 PA |
396 | static void context_switch (ptid_t ptid); |
397 | ||
4e1c45ea | 398 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 399 | |
53904c9e AC |
400 | static const char follow_fork_mode_child[] = "child"; |
401 | static const char follow_fork_mode_parent[] = "parent"; | |
402 | ||
40478521 | 403 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
404 | follow_fork_mode_child, |
405 | follow_fork_mode_parent, | |
406 | NULL | |
ef346e04 | 407 | }; |
c906108c | 408 | |
53904c9e | 409 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
410 | static void |
411 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
412 | struct cmd_list_element *c, const char *value) | |
413 | { | |
3e43a32a MS |
414 | fprintf_filtered (file, |
415 | _("Debugger response to a program " | |
416 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
417 | value); |
418 | } | |
c906108c SS |
419 | \f |
420 | ||
d83ad864 DB |
421 | /* Handle changes to the inferior list based on the type of fork, |
422 | which process is being followed, and whether the other process | |
423 | should be detached. On entry inferior_ptid must be the ptid of | |
424 | the fork parent. At return inferior_ptid is the ptid of the | |
425 | followed inferior. */ | |
426 | ||
427 | static int | |
428 | follow_fork_inferior (int follow_child, int detach_fork) | |
429 | { | |
430 | int has_vforked; | |
79639e11 | 431 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
432 | |
433 | has_vforked = (inferior_thread ()->pending_follow.kind | |
434 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
435 | parent_ptid = inferior_ptid; |
436 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
437 | |
438 | if (has_vforked | |
439 | && !non_stop /* Non-stop always resumes both branches. */ | |
440 | && (!target_is_async_p () || sync_execution) | |
441 | && !(follow_child || detach_fork || sched_multi)) | |
442 | { | |
443 | /* The parent stays blocked inside the vfork syscall until the | |
444 | child execs or exits. If we don't let the child run, then | |
445 | the parent stays blocked. If we're telling the parent to run | |
446 | in the foreground, the user will not be able to ctrl-c to get | |
447 | back the terminal, effectively hanging the debug session. */ | |
448 | fprintf_filtered (gdb_stderr, _("\ | |
449 | Can not resume the parent process over vfork in the foreground while\n\ | |
450 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
451 | \"set schedule-multiple\".\n")); | |
452 | /* FIXME output string > 80 columns. */ | |
453 | return 1; | |
454 | } | |
455 | ||
456 | if (!follow_child) | |
457 | { | |
458 | /* Detach new forked process? */ | |
459 | if (detach_fork) | |
460 | { | |
461 | struct cleanup *old_chain; | |
462 | ||
463 | /* Before detaching from the child, remove all breakpoints | |
464 | from it. If we forked, then this has already been taken | |
465 | care of by infrun.c. If we vforked however, any | |
466 | breakpoint inserted in the parent is visible in the | |
467 | child, even those added while stopped in a vfork | |
468 | catchpoint. This will remove the breakpoints from the | |
469 | parent also, but they'll be reinserted below. */ | |
470 | if (has_vforked) | |
471 | { | |
472 | /* Keep breakpoints list in sync. */ | |
473 | remove_breakpoints_pid (ptid_get_pid (inferior_ptid)); | |
474 | } | |
475 | ||
476 | if (info_verbose || debug_infrun) | |
477 | { | |
8dd06f7a DB |
478 | /* Ensure that we have a process ptid. */ |
479 | ptid_t process_ptid = pid_to_ptid (ptid_get_pid (child_ptid)); | |
480 | ||
6f259a23 | 481 | target_terminal_ours_for_output (); |
d83ad864 | 482 | fprintf_filtered (gdb_stdlog, |
79639e11 | 483 | _("Detaching after %s from child %s.\n"), |
6f259a23 | 484 | has_vforked ? "vfork" : "fork", |
8dd06f7a | 485 | target_pid_to_str (process_ptid)); |
d83ad864 DB |
486 | } |
487 | } | |
488 | else | |
489 | { | |
490 | struct inferior *parent_inf, *child_inf; | |
491 | struct cleanup *old_chain; | |
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 | ||
502 | old_chain = save_inferior_ptid (); | |
503 | save_current_program_space (); | |
504 | ||
79639e11 | 505 | inferior_ptid = child_ptid; |
d83ad864 DB |
506 | add_thread (inferior_ptid); |
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 | } | |
540 | ||
541 | do_cleanups (old_chain); | |
542 | } | |
543 | ||
544 | if (has_vforked) | |
545 | { | |
546 | struct inferior *parent_inf; | |
547 | ||
548 | parent_inf = current_inferior (); | |
549 | ||
550 | /* If we detached from the child, then we have to be careful | |
551 | to not insert breakpoints in the parent until the child | |
552 | is done with the shared memory region. However, if we're | |
553 | staying attached to the child, then we can and should | |
554 | insert breakpoints, so that we can debug it. A | |
555 | subsequent child exec or exit is enough to know when does | |
556 | the child stops using the parent's address space. */ | |
557 | parent_inf->waiting_for_vfork_done = detach_fork; | |
558 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
559 | } | |
560 | } | |
561 | else | |
562 | { | |
563 | /* Follow the child. */ | |
564 | struct inferior *parent_inf, *child_inf; | |
565 | struct program_space *parent_pspace; | |
566 | ||
567 | if (info_verbose || debug_infrun) | |
568 | { | |
6f259a23 DB |
569 | target_terminal_ours_for_output (); |
570 | fprintf_filtered (gdb_stdlog, | |
79639e11 PA |
571 | _("Attaching after %s %s to child %s.\n"), |
572 | target_pid_to_str (parent_ptid), | |
6f259a23 | 573 | has_vforked ? "vfork" : "fork", |
79639e11 | 574 | target_pid_to_str (child_ptid)); |
d83ad864 DB |
575 | } |
576 | ||
577 | /* Add the new inferior first, so that the target_detach below | |
578 | doesn't unpush the target. */ | |
579 | ||
79639e11 | 580 | child_inf = add_inferior (ptid_get_pid (child_ptid)); |
d83ad864 DB |
581 | |
582 | parent_inf = current_inferior (); | |
583 | child_inf->attach_flag = parent_inf->attach_flag; | |
584 | copy_terminal_info (child_inf, parent_inf); | |
585 | child_inf->gdbarch = parent_inf->gdbarch; | |
586 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
587 | ||
588 | parent_pspace = parent_inf->pspace; | |
589 | ||
590 | /* If we're vforking, we want to hold on to the parent until the | |
591 | child exits or execs. At child exec or exit time we can | |
592 | remove the old breakpoints from the parent and detach or | |
593 | resume debugging it. Otherwise, detach the parent now; we'll | |
594 | want to reuse it's program/address spaces, but we can't set | |
595 | them to the child before removing breakpoints from the | |
596 | parent, otherwise, the breakpoints module could decide to | |
597 | remove breakpoints from the wrong process (since they'd be | |
598 | assigned to the same address space). */ | |
599 | ||
600 | if (has_vforked) | |
601 | { | |
602 | gdb_assert (child_inf->vfork_parent == NULL); | |
603 | gdb_assert (parent_inf->vfork_child == NULL); | |
604 | child_inf->vfork_parent = parent_inf; | |
605 | child_inf->pending_detach = 0; | |
606 | parent_inf->vfork_child = child_inf; | |
607 | parent_inf->pending_detach = detach_fork; | |
608 | parent_inf->waiting_for_vfork_done = 0; | |
609 | } | |
610 | else if (detach_fork) | |
6f259a23 DB |
611 | { |
612 | if (info_verbose || debug_infrun) | |
613 | { | |
8dd06f7a DB |
614 | /* Ensure that we have a process ptid. */ |
615 | ptid_t process_ptid = pid_to_ptid (ptid_get_pid (child_ptid)); | |
616 | ||
6f259a23 DB |
617 | target_terminal_ours_for_output (); |
618 | fprintf_filtered (gdb_stdlog, | |
619 | _("Detaching after fork from " | |
79639e11 | 620 | "child %s.\n"), |
8dd06f7a | 621 | target_pid_to_str (process_ptid)); |
6f259a23 DB |
622 | } |
623 | ||
624 | target_detach (NULL, 0); | |
625 | } | |
d83ad864 DB |
626 | |
627 | /* Note that the detach above makes PARENT_INF dangling. */ | |
628 | ||
629 | /* Add the child thread to the appropriate lists, and switch to | |
630 | this new thread, before cloning the program space, and | |
631 | informing the solib layer about this new process. */ | |
632 | ||
79639e11 | 633 | inferior_ptid = child_ptid; |
d83ad864 DB |
634 | add_thread (inferior_ptid); |
635 | ||
636 | /* If this is a vfork child, then the address-space is shared | |
637 | with the parent. If we detached from the parent, then we can | |
638 | reuse the parent's program/address spaces. */ | |
639 | if (has_vforked || detach_fork) | |
640 | { | |
641 | child_inf->pspace = parent_pspace; | |
642 | child_inf->aspace = child_inf->pspace->aspace; | |
643 | } | |
644 | else | |
645 | { | |
646 | child_inf->aspace = new_address_space (); | |
647 | child_inf->pspace = add_program_space (child_inf->aspace); | |
648 | child_inf->removable = 1; | |
649 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
650 | set_current_program_space (child_inf->pspace); | |
651 | clone_program_space (child_inf->pspace, parent_pspace); | |
652 | ||
653 | /* Let the shared library layer (e.g., solib-svr4) learn | |
654 | about this new process, relocate the cloned exec, pull in | |
655 | shared libraries, and install the solib event breakpoint. | |
656 | If a "cloned-VM" event was propagated better throughout | |
657 | the core, this wouldn't be required. */ | |
658 | solib_create_inferior_hook (0); | |
659 | } | |
660 | } | |
661 | ||
662 | return target_follow_fork (follow_child, detach_fork); | |
663 | } | |
664 | ||
e58b0e63 PA |
665 | /* Tell the target to follow the fork we're stopped at. Returns true |
666 | if the inferior should be resumed; false, if the target for some | |
667 | reason decided it's best not to resume. */ | |
668 | ||
6604731b | 669 | static int |
4ef3f3be | 670 | follow_fork (void) |
c906108c | 671 | { |
ea1dd7bc | 672 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
673 | int should_resume = 1; |
674 | struct thread_info *tp; | |
675 | ||
676 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
677 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
678 | parent thread structure's run control related fields, not just these. |
679 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
680 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 681 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
682 | CORE_ADDR step_range_start = 0; |
683 | CORE_ADDR step_range_end = 0; | |
684 | struct frame_id step_frame_id = { 0 }; | |
17b2616c | 685 | struct interp *command_interp = NULL; |
e58b0e63 PA |
686 | |
687 | if (!non_stop) | |
688 | { | |
689 | ptid_t wait_ptid; | |
690 | struct target_waitstatus wait_status; | |
691 | ||
692 | /* Get the last target status returned by target_wait(). */ | |
693 | get_last_target_status (&wait_ptid, &wait_status); | |
694 | ||
695 | /* If not stopped at a fork event, then there's nothing else to | |
696 | do. */ | |
697 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
698 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
699 | return 1; | |
700 | ||
701 | /* Check if we switched over from WAIT_PTID, since the event was | |
702 | reported. */ | |
703 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
704 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
705 | { | |
706 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
707 | target to follow it (in either direction). We'll | |
708 | afterwards refuse to resume, and inform the user what | |
709 | happened. */ | |
710 | switch_to_thread (wait_ptid); | |
711 | should_resume = 0; | |
712 | } | |
713 | } | |
714 | ||
715 | tp = inferior_thread (); | |
716 | ||
717 | /* If there were any forks/vforks that were caught and are now to be | |
718 | followed, then do so now. */ | |
719 | switch (tp->pending_follow.kind) | |
720 | { | |
721 | case TARGET_WAITKIND_FORKED: | |
722 | case TARGET_WAITKIND_VFORKED: | |
723 | { | |
724 | ptid_t parent, child; | |
725 | ||
726 | /* If the user did a next/step, etc, over a fork call, | |
727 | preserve the stepping state in the fork child. */ | |
728 | if (follow_child && should_resume) | |
729 | { | |
8358c15c JK |
730 | step_resume_breakpoint = clone_momentary_breakpoint |
731 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
732 | step_range_start = tp->control.step_range_start; |
733 | step_range_end = tp->control.step_range_end; | |
734 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
735 | exception_resume_breakpoint |
736 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
17b2616c | 737 | command_interp = tp->control.command_interp; |
e58b0e63 PA |
738 | |
739 | /* For now, delete the parent's sr breakpoint, otherwise, | |
740 | parent/child sr breakpoints are considered duplicates, | |
741 | and the child version will not be installed. Remove | |
742 | this when the breakpoints module becomes aware of | |
743 | inferiors and address spaces. */ | |
744 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
745 | tp->control.step_range_start = 0; |
746 | tp->control.step_range_end = 0; | |
747 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 748 | delete_exception_resume_breakpoint (tp); |
17b2616c | 749 | tp->control.command_interp = NULL; |
e58b0e63 PA |
750 | } |
751 | ||
752 | parent = inferior_ptid; | |
753 | child = tp->pending_follow.value.related_pid; | |
754 | ||
d83ad864 DB |
755 | /* Set up inferior(s) as specified by the caller, and tell the |
756 | target to do whatever is necessary to follow either parent | |
757 | or child. */ | |
758 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
759 | { |
760 | /* Target refused to follow, or there's some other reason | |
761 | we shouldn't resume. */ | |
762 | should_resume = 0; | |
763 | } | |
764 | else | |
765 | { | |
766 | /* This pending follow fork event is now handled, one way | |
767 | or another. The previous selected thread may be gone | |
768 | from the lists by now, but if it is still around, need | |
769 | to clear the pending follow request. */ | |
e09875d4 | 770 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
771 | if (tp) |
772 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
773 | ||
774 | /* This makes sure we don't try to apply the "Switched | |
775 | over from WAIT_PID" logic above. */ | |
776 | nullify_last_target_wait_ptid (); | |
777 | ||
1777feb0 | 778 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
779 | if (follow_child) |
780 | { | |
781 | switch_to_thread (child); | |
782 | ||
783 | /* ... and preserve the stepping state, in case the | |
784 | user was stepping over the fork call. */ | |
785 | if (should_resume) | |
786 | { | |
787 | tp = inferior_thread (); | |
8358c15c JK |
788 | tp->control.step_resume_breakpoint |
789 | = step_resume_breakpoint; | |
16c381f0 JK |
790 | tp->control.step_range_start = step_range_start; |
791 | tp->control.step_range_end = step_range_end; | |
792 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
793 | tp->control.exception_resume_breakpoint |
794 | = exception_resume_breakpoint; | |
17b2616c | 795 | tp->control.command_interp = command_interp; |
e58b0e63 PA |
796 | } |
797 | else | |
798 | { | |
799 | /* If we get here, it was because we're trying to | |
800 | resume from a fork catchpoint, but, the user | |
801 | has switched threads away from the thread that | |
802 | forked. In that case, the resume command | |
803 | issued is most likely not applicable to the | |
804 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 805 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 806 | "before following fork child.")); |
e58b0e63 PA |
807 | } |
808 | ||
809 | /* Reset breakpoints in the child as appropriate. */ | |
810 | follow_inferior_reset_breakpoints (); | |
811 | } | |
812 | else | |
813 | switch_to_thread (parent); | |
814 | } | |
815 | } | |
816 | break; | |
817 | case TARGET_WAITKIND_SPURIOUS: | |
818 | /* Nothing to follow. */ | |
819 | break; | |
820 | default: | |
821 | internal_error (__FILE__, __LINE__, | |
822 | "Unexpected pending_follow.kind %d\n", | |
823 | tp->pending_follow.kind); | |
824 | break; | |
825 | } | |
c906108c | 826 | |
e58b0e63 | 827 | return should_resume; |
c906108c SS |
828 | } |
829 | ||
d83ad864 | 830 | static void |
6604731b | 831 | follow_inferior_reset_breakpoints (void) |
c906108c | 832 | { |
4e1c45ea PA |
833 | struct thread_info *tp = inferior_thread (); |
834 | ||
6604731b DJ |
835 | /* Was there a step_resume breakpoint? (There was if the user |
836 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
837 | thread number. Cloned step_resume breakpoints are disabled on |
838 | creation, so enable it here now that it is associated with the | |
839 | correct thread. | |
6604731b DJ |
840 | |
841 | step_resumes are a form of bp that are made to be per-thread. | |
842 | Since we created the step_resume bp when the parent process | |
843 | was being debugged, and now are switching to the child process, | |
844 | from the breakpoint package's viewpoint, that's a switch of | |
845 | "threads". We must update the bp's notion of which thread | |
846 | it is for, or it'll be ignored when it triggers. */ | |
847 | ||
8358c15c | 848 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
849 | { |
850 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
851 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
852 | } | |
6604731b | 853 | |
a1aa2221 | 854 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 855 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
856 | { |
857 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
858 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
859 | } | |
186c406b | 860 | |
6604731b DJ |
861 | /* Reinsert all breakpoints in the child. The user may have set |
862 | breakpoints after catching the fork, in which case those | |
863 | were never set in the child, but only in the parent. This makes | |
864 | sure the inserted breakpoints match the breakpoint list. */ | |
865 | ||
866 | breakpoint_re_set (); | |
867 | insert_breakpoints (); | |
c906108c | 868 | } |
c906108c | 869 | |
6c95b8df PA |
870 | /* The child has exited or execed: resume threads of the parent the |
871 | user wanted to be executing. */ | |
872 | ||
873 | static int | |
874 | proceed_after_vfork_done (struct thread_info *thread, | |
875 | void *arg) | |
876 | { | |
877 | int pid = * (int *) arg; | |
878 | ||
879 | if (ptid_get_pid (thread->ptid) == pid | |
880 | && is_running (thread->ptid) | |
881 | && !is_executing (thread->ptid) | |
882 | && !thread->stop_requested | |
a493e3e2 | 883 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df PA |
884 | { |
885 | if (debug_infrun) | |
886 | fprintf_unfiltered (gdb_stdlog, | |
887 | "infrun: resuming vfork parent thread %s\n", | |
888 | target_pid_to_str (thread->ptid)); | |
889 | ||
890 | switch_to_thread (thread->ptid); | |
70509625 | 891 | clear_proceed_status (0); |
64ce06e4 | 892 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
893 | } |
894 | ||
895 | return 0; | |
896 | } | |
897 | ||
898 | /* Called whenever we notice an exec or exit event, to handle | |
899 | detaching or resuming a vfork parent. */ | |
900 | ||
901 | static void | |
902 | handle_vfork_child_exec_or_exit (int exec) | |
903 | { | |
904 | struct inferior *inf = current_inferior (); | |
905 | ||
906 | if (inf->vfork_parent) | |
907 | { | |
908 | int resume_parent = -1; | |
909 | ||
910 | /* This exec or exit marks the end of the shared memory region | |
911 | between the parent and the child. If the user wanted to | |
912 | detach from the parent, now is the time. */ | |
913 | ||
914 | if (inf->vfork_parent->pending_detach) | |
915 | { | |
916 | struct thread_info *tp; | |
917 | struct cleanup *old_chain; | |
918 | struct program_space *pspace; | |
919 | struct address_space *aspace; | |
920 | ||
1777feb0 | 921 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 922 | |
68c9da30 PA |
923 | inf->vfork_parent->pending_detach = 0; |
924 | ||
f50f4e56 PA |
925 | if (!exec) |
926 | { | |
927 | /* If we're handling a child exit, then inferior_ptid | |
928 | points at the inferior's pid, not to a thread. */ | |
929 | old_chain = save_inferior_ptid (); | |
930 | save_current_program_space (); | |
931 | save_current_inferior (); | |
932 | } | |
933 | else | |
934 | old_chain = save_current_space_and_thread (); | |
6c95b8df PA |
935 | |
936 | /* We're letting loose of the parent. */ | |
937 | tp = any_live_thread_of_process (inf->vfork_parent->pid); | |
938 | switch_to_thread (tp->ptid); | |
939 | ||
940 | /* We're about to detach from the parent, which implicitly | |
941 | removes breakpoints from its address space. There's a | |
942 | catch here: we want to reuse the spaces for the child, | |
943 | but, parent/child are still sharing the pspace at this | |
944 | point, although the exec in reality makes the kernel give | |
945 | the child a fresh set of new pages. The problem here is | |
946 | that the breakpoints module being unaware of this, would | |
947 | likely chose the child process to write to the parent | |
948 | address space. Swapping the child temporarily away from | |
949 | the spaces has the desired effect. Yes, this is "sort | |
950 | of" a hack. */ | |
951 | ||
952 | pspace = inf->pspace; | |
953 | aspace = inf->aspace; | |
954 | inf->aspace = NULL; | |
955 | inf->pspace = NULL; | |
956 | ||
957 | if (debug_infrun || info_verbose) | |
958 | { | |
6f259a23 | 959 | target_terminal_ours_for_output (); |
6c95b8df PA |
960 | |
961 | if (exec) | |
6f259a23 DB |
962 | { |
963 | fprintf_filtered (gdb_stdlog, | |
964 | _("Detaching vfork parent process " | |
965 | "%d after child exec.\n"), | |
966 | inf->vfork_parent->pid); | |
967 | } | |
6c95b8df | 968 | else |
6f259a23 DB |
969 | { |
970 | fprintf_filtered (gdb_stdlog, | |
971 | _("Detaching vfork parent process " | |
972 | "%d after child exit.\n"), | |
973 | inf->vfork_parent->pid); | |
974 | } | |
6c95b8df PA |
975 | } |
976 | ||
977 | target_detach (NULL, 0); | |
978 | ||
979 | /* Put it back. */ | |
980 | inf->pspace = pspace; | |
981 | inf->aspace = aspace; | |
982 | ||
983 | do_cleanups (old_chain); | |
984 | } | |
985 | else if (exec) | |
986 | { | |
987 | /* We're staying attached to the parent, so, really give the | |
988 | child a new address space. */ | |
989 | inf->pspace = add_program_space (maybe_new_address_space ()); | |
990 | inf->aspace = inf->pspace->aspace; | |
991 | inf->removable = 1; | |
992 | set_current_program_space (inf->pspace); | |
993 | ||
994 | resume_parent = inf->vfork_parent->pid; | |
995 | ||
996 | /* Break the bonds. */ | |
997 | inf->vfork_parent->vfork_child = NULL; | |
998 | } | |
999 | else | |
1000 | { | |
1001 | struct cleanup *old_chain; | |
1002 | struct program_space *pspace; | |
1003 | ||
1004 | /* If this is a vfork child exiting, then the pspace and | |
1005 | aspaces were shared with the parent. Since we're | |
1006 | reporting the process exit, we'll be mourning all that is | |
1007 | found in the address space, and switching to null_ptid, | |
1008 | preparing to start a new inferior. But, since we don't | |
1009 | want to clobber the parent's address/program spaces, we | |
1010 | go ahead and create a new one for this exiting | |
1011 | inferior. */ | |
1012 | ||
1013 | /* Switch to null_ptid, so that clone_program_space doesn't want | |
1014 | to read the selected frame of a dead process. */ | |
1015 | old_chain = save_inferior_ptid (); | |
1016 | inferior_ptid = null_ptid; | |
1017 | ||
1018 | /* This inferior is dead, so avoid giving the breakpoints | |
1019 | module the option to write through to it (cloning a | |
1020 | program space resets breakpoints). */ | |
1021 | inf->aspace = NULL; | |
1022 | inf->pspace = NULL; | |
1023 | pspace = add_program_space (maybe_new_address_space ()); | |
1024 | set_current_program_space (pspace); | |
1025 | inf->removable = 1; | |
7dcd53a0 | 1026 | inf->symfile_flags = SYMFILE_NO_READ; |
6c95b8df PA |
1027 | clone_program_space (pspace, inf->vfork_parent->pspace); |
1028 | inf->pspace = pspace; | |
1029 | inf->aspace = pspace->aspace; | |
1030 | ||
1031 | /* Put back inferior_ptid. We'll continue mourning this | |
1777feb0 | 1032 | inferior. */ |
6c95b8df PA |
1033 | do_cleanups (old_chain); |
1034 | ||
1035 | resume_parent = inf->vfork_parent->pid; | |
1036 | /* Break the bonds. */ | |
1037 | inf->vfork_parent->vfork_child = NULL; | |
1038 | } | |
1039 | ||
1040 | inf->vfork_parent = NULL; | |
1041 | ||
1042 | gdb_assert (current_program_space == inf->pspace); | |
1043 | ||
1044 | if (non_stop && resume_parent != -1) | |
1045 | { | |
1046 | /* If the user wanted the parent to be running, let it go | |
1047 | free now. */ | |
1048 | struct cleanup *old_chain = make_cleanup_restore_current_thread (); | |
1049 | ||
1050 | if (debug_infrun) | |
3e43a32a MS |
1051 | fprintf_unfiltered (gdb_stdlog, |
1052 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
1053 | resume_parent); |
1054 | ||
1055 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
1056 | ||
1057 | do_cleanups (old_chain); | |
1058 | } | |
1059 | } | |
1060 | } | |
1061 | ||
eb6c553b | 1062 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1063 | |
1064 | static const char follow_exec_mode_new[] = "new"; | |
1065 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1066 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1067 | { |
1068 | follow_exec_mode_new, | |
1069 | follow_exec_mode_same, | |
1070 | NULL, | |
1071 | }; | |
1072 | ||
1073 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1074 | static void | |
1075 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1076 | struct cmd_list_element *c, const char *value) | |
1077 | { | |
1078 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1079 | } | |
1080 | ||
1777feb0 | 1081 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
1adeb98a | 1082 | |
c906108c | 1083 | static void |
95e50b27 | 1084 | follow_exec (ptid_t ptid, char *execd_pathname) |
c906108c | 1085 | { |
95e50b27 | 1086 | struct thread_info *th, *tmp; |
6c95b8df | 1087 | struct inferior *inf = current_inferior (); |
95e50b27 | 1088 | int pid = ptid_get_pid (ptid); |
7a292a7a | 1089 | |
c906108c SS |
1090 | /* This is an exec event that we actually wish to pay attention to. |
1091 | Refresh our symbol table to the newly exec'd program, remove any | |
1092 | momentary bp's, etc. | |
1093 | ||
1094 | If there are breakpoints, they aren't really inserted now, | |
1095 | since the exec() transformed our inferior into a fresh set | |
1096 | of instructions. | |
1097 | ||
1098 | We want to preserve symbolic breakpoints on the list, since | |
1099 | we have hopes that they can be reset after the new a.out's | |
1100 | symbol table is read. | |
1101 | ||
1102 | However, any "raw" breakpoints must be removed from the list | |
1103 | (e.g., the solib bp's), since their address is probably invalid | |
1104 | now. | |
1105 | ||
1106 | And, we DON'T want to call delete_breakpoints() here, since | |
1107 | that may write the bp's "shadow contents" (the instruction | |
1108 | value that was overwritten witha TRAP instruction). Since | |
1777feb0 | 1109 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1110 | |
1111 | mark_breakpoints_out (); | |
1112 | ||
95e50b27 PA |
1113 | /* The target reports the exec event to the main thread, even if |
1114 | some other thread does the exec, and even if the main thread was | |
1115 | stopped or already gone. We may still have non-leader threads of | |
1116 | the process on our list. E.g., on targets that don't have thread | |
1117 | exit events (like remote); or on native Linux in non-stop mode if | |
1118 | there were only two threads in the inferior and the non-leader | |
1119 | one is the one that execs (and nothing forces an update of the | |
1120 | thread list up to here). When debugging remotely, it's best to | |
1121 | avoid extra traffic, when possible, so avoid syncing the thread | |
1122 | list with the target, and instead go ahead and delete all threads | |
1123 | of the process but one that reported the event. Note this must | |
1124 | be done before calling update_breakpoints_after_exec, as | |
1125 | otherwise clearing the threads' resources would reference stale | |
1126 | thread breakpoints -- it may have been one of these threads that | |
1127 | stepped across the exec. We could just clear their stepping | |
1128 | states, but as long as we're iterating, might as well delete | |
1129 | them. Deleting them now rather than at the next user-visible | |
1130 | stop provides a nicer sequence of events for user and MI | |
1131 | notifications. */ | |
8a06aea7 | 1132 | ALL_THREADS_SAFE (th, tmp) |
95e50b27 PA |
1133 | if (ptid_get_pid (th->ptid) == pid && !ptid_equal (th->ptid, ptid)) |
1134 | delete_thread (th->ptid); | |
1135 | ||
1136 | /* We also need to clear any left over stale state for the | |
1137 | leader/event thread. E.g., if there was any step-resume | |
1138 | breakpoint or similar, it's gone now. We cannot truly | |
1139 | step-to-next statement through an exec(). */ | |
1140 | th = inferior_thread (); | |
8358c15c | 1141 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1142 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1143 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1144 | th->control.step_range_start = 0; |
1145 | th->control.step_range_end = 0; | |
c906108c | 1146 | |
95e50b27 PA |
1147 | /* The user may have had the main thread held stopped in the |
1148 | previous image (e.g., schedlock on, or non-stop). Release | |
1149 | it now. */ | |
a75724bc PA |
1150 | th->stop_requested = 0; |
1151 | ||
95e50b27 PA |
1152 | update_breakpoints_after_exec (); |
1153 | ||
1777feb0 | 1154 | /* What is this a.out's name? */ |
6c95b8df PA |
1155 | printf_unfiltered (_("%s is executing new program: %s\n"), |
1156 | target_pid_to_str (inferior_ptid), | |
1157 | execd_pathname); | |
c906108c SS |
1158 | |
1159 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1160 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1161 | |
c906108c | 1162 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
1163 | |
1164 | breakpoint_init_inferior (inf_execd); | |
e85a822c | 1165 | |
a3be80c3 | 1166 | if (*gdb_sysroot != '\0') |
e85a822c | 1167 | { |
998d2a3e | 1168 | char *name = exec_file_find (execd_pathname, NULL); |
ff862be4 GB |
1169 | |
1170 | execd_pathname = alloca (strlen (name) + 1); | |
1171 | strcpy (execd_pathname, name); | |
1172 | xfree (name); | |
e85a822c | 1173 | } |
c906108c | 1174 | |
cce9b6bf PA |
1175 | /* Reset the shared library package. This ensures that we get a |
1176 | shlib event when the child reaches "_start", at which point the | |
1177 | dld will have had a chance to initialize the child. */ | |
1178 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1179 | we don't want those to be satisfied by the libraries of the | |
1180 | previous incarnation of this process. */ | |
1181 | no_shared_libraries (NULL, 0); | |
1182 | ||
6c95b8df PA |
1183 | if (follow_exec_mode_string == follow_exec_mode_new) |
1184 | { | |
1185 | struct program_space *pspace; | |
6c95b8df PA |
1186 | |
1187 | /* The user wants to keep the old inferior and program spaces | |
1188 | around. Create a new fresh one, and switch to it. */ | |
1189 | ||
17d8546e DB |
1190 | /* Do exit processing for the original inferior before adding |
1191 | the new inferior so we don't have two active inferiors with | |
1192 | the same ptid, which can confuse find_inferior_ptid. */ | |
1193 | exit_inferior_num_silent (current_inferior ()->num); | |
1194 | ||
1195 | inf = add_inferior (pid); | |
6c95b8df PA |
1196 | pspace = add_program_space (maybe_new_address_space ()); |
1197 | inf->pspace = pspace; | |
1198 | inf->aspace = pspace->aspace; | |
17d8546e | 1199 | add_thread (ptid); |
6c95b8df PA |
1200 | |
1201 | set_current_inferior (inf); | |
1202 | set_current_program_space (pspace); | |
1203 | } | |
9107fc8d PA |
1204 | else |
1205 | { | |
1206 | /* The old description may no longer be fit for the new image. | |
1207 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1208 | old description; we'll read a new one below. No need to do | |
1209 | this on "follow-exec-mode new", as the old inferior stays | |
1210 | around (its description is later cleared/refetched on | |
1211 | restart). */ | |
1212 | target_clear_description (); | |
1213 | } | |
6c95b8df PA |
1214 | |
1215 | gdb_assert (current_program_space == inf->pspace); | |
1216 | ||
1777feb0 | 1217 | /* That a.out is now the one to use. */ |
6c95b8df PA |
1218 | exec_file_attach (execd_pathname, 0); |
1219 | ||
c1e56572 JK |
1220 | /* SYMFILE_DEFER_BP_RESET is used as the proper displacement for PIE |
1221 | (Position Independent Executable) main symbol file will get applied by | |
1222 | solib_create_inferior_hook below. breakpoint_re_set would fail to insert | |
1223 | the breakpoints with the zero displacement. */ | |
1224 | ||
7dcd53a0 TT |
1225 | symbol_file_add (execd_pathname, |
1226 | (inf->symfile_flags | |
1227 | | SYMFILE_MAINLINE | SYMFILE_DEFER_BP_RESET), | |
c1e56572 JK |
1228 | NULL, 0); |
1229 | ||
7dcd53a0 TT |
1230 | if ((inf->symfile_flags & SYMFILE_NO_READ) == 0) |
1231 | set_initial_language (); | |
c906108c | 1232 | |
9107fc8d PA |
1233 | /* If the target can specify a description, read it. Must do this |
1234 | after flipping to the new executable (because the target supplied | |
1235 | description must be compatible with the executable's | |
1236 | architecture, and the old executable may e.g., be 32-bit, while | |
1237 | the new one 64-bit), and before anything involving memory or | |
1238 | registers. */ | |
1239 | target_find_description (); | |
1240 | ||
268a4a75 | 1241 | solib_create_inferior_hook (0); |
c906108c | 1242 | |
4efc6507 DE |
1243 | jit_inferior_created_hook (); |
1244 | ||
c1e56572 JK |
1245 | breakpoint_re_set (); |
1246 | ||
c906108c SS |
1247 | /* Reinsert all breakpoints. (Those which were symbolic have |
1248 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1249 | to symbol_file_command...). */ |
c906108c SS |
1250 | insert_breakpoints (); |
1251 | ||
1252 | /* The next resume of this inferior should bring it to the shlib | |
1253 | startup breakpoints. (If the user had also set bp's on | |
1254 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1255 | matically get reset there in the new process.). */ |
c906108c SS |
1256 | } |
1257 | ||
c2829269 PA |
1258 | /* The queue of threads that need to do a step-over operation to get |
1259 | past e.g., a breakpoint. What technique is used to step over the | |
1260 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1261 | same queue, to maintain rough temporal order of execution, in order | |
1262 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1263 | constantly stepping the same couple threads past their breakpoints | |
1264 | over and over, if the single-step finish fast enough. */ | |
1265 | struct thread_info *step_over_queue_head; | |
1266 | ||
6c4cfb24 PA |
1267 | /* Bit flags indicating what the thread needs to step over. */ |
1268 | ||
1269 | enum step_over_what | |
1270 | { | |
1271 | /* Step over a breakpoint. */ | |
1272 | STEP_OVER_BREAKPOINT = 1, | |
1273 | ||
1274 | /* Step past a non-continuable watchpoint, in order to let the | |
1275 | instruction execute so we can evaluate the watchpoint | |
1276 | expression. */ | |
1277 | STEP_OVER_WATCHPOINT = 2 | |
1278 | }; | |
1279 | ||
963f9c80 | 1280 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1281 | |
1282 | struct step_over_info | |
1283 | { | |
963f9c80 PA |
1284 | /* If we're stepping past a breakpoint, this is the address space |
1285 | and address of the instruction the breakpoint is set at. We'll | |
1286 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1287 | non-NULL. */ | |
31e77af2 | 1288 | struct address_space *aspace; |
31e77af2 | 1289 | CORE_ADDR address; |
963f9c80 PA |
1290 | |
1291 | /* The instruction being stepped over triggers a nonsteppable | |
1292 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1293 | int nonsteppable_watchpoint_p; | |
31e77af2 PA |
1294 | }; |
1295 | ||
1296 | /* The step-over info of the location that is being stepped over. | |
1297 | ||
1298 | Note that with async/breakpoint always-inserted mode, a user might | |
1299 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1300 | being stepped over. As setting a new breakpoint inserts all | |
1301 | breakpoints, we need to make sure the breakpoint being stepped over | |
1302 | isn't inserted then. We do that by only clearing the step-over | |
1303 | info when the step-over is actually finished (or aborted). | |
1304 | ||
1305 | Presently GDB can only step over one breakpoint at any given time. | |
1306 | Given threads that can't run code in the same address space as the | |
1307 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1308 | to step-over at most one breakpoint per address space (so this info | |
1309 | could move to the address space object if/when GDB is extended). | |
1310 | The set of breakpoints being stepped over will normally be much | |
1311 | smaller than the set of all breakpoints, so a flag in the | |
1312 | breakpoint location structure would be wasteful. A separate list | |
1313 | also saves complexity and run-time, as otherwise we'd have to go | |
1314 | through all breakpoint locations clearing their flag whenever we | |
1315 | start a new sequence. Similar considerations weigh against storing | |
1316 | this info in the thread object. Plus, not all step overs actually | |
1317 | have breakpoint locations -- e.g., stepping past a single-step | |
1318 | breakpoint, or stepping to complete a non-continuable | |
1319 | watchpoint. */ | |
1320 | static struct step_over_info step_over_info; | |
1321 | ||
1322 | /* Record the address of the breakpoint/instruction we're currently | |
1323 | stepping over. */ | |
1324 | ||
1325 | static void | |
963f9c80 PA |
1326 | set_step_over_info (struct address_space *aspace, CORE_ADDR address, |
1327 | int nonsteppable_watchpoint_p) | |
31e77af2 PA |
1328 | { |
1329 | step_over_info.aspace = aspace; | |
1330 | step_over_info.address = address; | |
963f9c80 | 1331 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
31e77af2 PA |
1332 | } |
1333 | ||
1334 | /* Called when we're not longer stepping over a breakpoint / an | |
1335 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1336 | ||
1337 | static void | |
1338 | clear_step_over_info (void) | |
1339 | { | |
372316f1 PA |
1340 | if (debug_infrun) |
1341 | fprintf_unfiltered (gdb_stdlog, | |
1342 | "infrun: clear_step_over_info\n"); | |
31e77af2 PA |
1343 | step_over_info.aspace = NULL; |
1344 | step_over_info.address = 0; | |
963f9c80 | 1345 | step_over_info.nonsteppable_watchpoint_p = 0; |
31e77af2 PA |
1346 | } |
1347 | ||
7f89fd65 | 1348 | /* See infrun.h. */ |
31e77af2 PA |
1349 | |
1350 | int | |
1351 | stepping_past_instruction_at (struct address_space *aspace, | |
1352 | CORE_ADDR address) | |
1353 | { | |
1354 | return (step_over_info.aspace != NULL | |
1355 | && breakpoint_address_match (aspace, address, | |
1356 | step_over_info.aspace, | |
1357 | step_over_info.address)); | |
1358 | } | |
1359 | ||
963f9c80 PA |
1360 | /* See infrun.h. */ |
1361 | ||
1362 | int | |
1363 | stepping_past_nonsteppable_watchpoint (void) | |
1364 | { | |
1365 | return step_over_info.nonsteppable_watchpoint_p; | |
1366 | } | |
1367 | ||
6cc83d2a PA |
1368 | /* Returns true if step-over info is valid. */ |
1369 | ||
1370 | static int | |
1371 | step_over_info_valid_p (void) | |
1372 | { | |
963f9c80 PA |
1373 | return (step_over_info.aspace != NULL |
1374 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1375 | } |
1376 | ||
c906108c | 1377 | \f |
237fc4c9 PA |
1378 | /* Displaced stepping. */ |
1379 | ||
1380 | /* In non-stop debugging mode, we must take special care to manage | |
1381 | breakpoints properly; in particular, the traditional strategy for | |
1382 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1383 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1384 | breakpoint it has hit while ensuring that other threads running | |
1385 | concurrently will hit the breakpoint as they should. | |
1386 | ||
1387 | The traditional way to step a thread T off a breakpoint in a | |
1388 | multi-threaded program in all-stop mode is as follows: | |
1389 | ||
1390 | a0) Initially, all threads are stopped, and breakpoints are not | |
1391 | inserted. | |
1392 | a1) We single-step T, leaving breakpoints uninserted. | |
1393 | a2) We insert breakpoints, and resume all threads. | |
1394 | ||
1395 | In non-stop debugging, however, this strategy is unsuitable: we | |
1396 | don't want to have to stop all threads in the system in order to | |
1397 | continue or step T past a breakpoint. Instead, we use displaced | |
1398 | stepping: | |
1399 | ||
1400 | n0) Initially, T is stopped, other threads are running, and | |
1401 | breakpoints are inserted. | |
1402 | n1) We copy the instruction "under" the breakpoint to a separate | |
1403 | location, outside the main code stream, making any adjustments | |
1404 | to the instruction, register, and memory state as directed by | |
1405 | T's architecture. | |
1406 | n2) We single-step T over the instruction at its new location. | |
1407 | n3) We adjust the resulting register and memory state as directed | |
1408 | by T's architecture. This includes resetting T's PC to point | |
1409 | back into the main instruction stream. | |
1410 | n4) We resume T. | |
1411 | ||
1412 | This approach depends on the following gdbarch methods: | |
1413 | ||
1414 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1415 | indicate where to copy the instruction, and how much space must | |
1416 | be reserved there. We use these in step n1. | |
1417 | ||
1418 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1419 | address, and makes any necessary adjustments to the instruction, | |
1420 | register contents, and memory. We use this in step n1. | |
1421 | ||
1422 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
1423 | we have successfuly single-stepped the instruction, to yield the | |
1424 | same effect the instruction would have had if we had executed it | |
1425 | at its original address. We use this in step n3. | |
1426 | ||
1427 | - gdbarch_displaced_step_free_closure provides cleanup. | |
1428 | ||
1429 | The gdbarch_displaced_step_copy_insn and | |
1430 | gdbarch_displaced_step_fixup functions must be written so that | |
1431 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1432 | single-stepping across the copied instruction, and then applying | |
1433 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1434 | thread's memory and registers as stepping the instruction in place | |
1435 | would have. Exactly which responsibilities fall to the copy and | |
1436 | which fall to the fixup is up to the author of those functions. | |
1437 | ||
1438 | See the comments in gdbarch.sh for details. | |
1439 | ||
1440 | Note that displaced stepping and software single-step cannot | |
1441 | currently be used in combination, although with some care I think | |
1442 | they could be made to. Software single-step works by placing | |
1443 | breakpoints on all possible subsequent instructions; if the | |
1444 | displaced instruction is a PC-relative jump, those breakpoints | |
1445 | could fall in very strange places --- on pages that aren't | |
1446 | executable, or at addresses that are not proper instruction | |
1447 | boundaries. (We do generally let other threads run while we wait | |
1448 | to hit the software single-step breakpoint, and they might | |
1449 | encounter such a corrupted instruction.) One way to work around | |
1450 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1451 | simulate the effect of PC-relative instructions (and return NULL) | |
1452 | on architectures that use software single-stepping. | |
1453 | ||
1454 | In non-stop mode, we can have independent and simultaneous step | |
1455 | requests, so more than one thread may need to simultaneously step | |
1456 | over a breakpoint. The current implementation assumes there is | |
1457 | only one scratch space per process. In this case, we have to | |
1458 | serialize access to the scratch space. If thread A wants to step | |
1459 | over a breakpoint, but we are currently waiting for some other | |
1460 | thread to complete a displaced step, we leave thread A stopped and | |
1461 | place it in the displaced_step_request_queue. Whenever a displaced | |
1462 | step finishes, we pick the next thread in the queue and start a new | |
1463 | displaced step operation on it. See displaced_step_prepare and | |
1464 | displaced_step_fixup for details. */ | |
1465 | ||
fc1cf338 PA |
1466 | /* Per-inferior displaced stepping state. */ |
1467 | struct displaced_step_inferior_state | |
1468 | { | |
1469 | /* Pointer to next in linked list. */ | |
1470 | struct displaced_step_inferior_state *next; | |
1471 | ||
1472 | /* The process this displaced step state refers to. */ | |
1473 | int pid; | |
1474 | ||
3fc8eb30 PA |
1475 | /* True if preparing a displaced step ever failed. If so, we won't |
1476 | try displaced stepping for this inferior again. */ | |
1477 | int failed_before; | |
1478 | ||
fc1cf338 PA |
1479 | /* If this is not null_ptid, this is the thread carrying out a |
1480 | displaced single-step in process PID. This thread's state will | |
1481 | require fixing up once it has completed its step. */ | |
1482 | ptid_t step_ptid; | |
1483 | ||
1484 | /* The architecture the thread had when we stepped it. */ | |
1485 | struct gdbarch *step_gdbarch; | |
1486 | ||
1487 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
1488 | for post-step cleanup. */ | |
1489 | struct displaced_step_closure *step_closure; | |
1490 | ||
1491 | /* The address of the original instruction, and the copy we | |
1492 | made. */ | |
1493 | CORE_ADDR step_original, step_copy; | |
1494 | ||
1495 | /* Saved contents of copy area. */ | |
1496 | gdb_byte *step_saved_copy; | |
1497 | }; | |
1498 | ||
1499 | /* The list of states of processes involved in displaced stepping | |
1500 | presently. */ | |
1501 | static struct displaced_step_inferior_state *displaced_step_inferior_states; | |
1502 | ||
1503 | /* Get the displaced stepping state of process PID. */ | |
1504 | ||
1505 | static struct displaced_step_inferior_state * | |
1506 | get_displaced_stepping_state (int pid) | |
1507 | { | |
1508 | struct displaced_step_inferior_state *state; | |
1509 | ||
1510 | for (state = displaced_step_inferior_states; | |
1511 | state != NULL; | |
1512 | state = state->next) | |
1513 | if (state->pid == pid) | |
1514 | return state; | |
1515 | ||
1516 | return NULL; | |
1517 | } | |
1518 | ||
372316f1 PA |
1519 | /* Returns true if any inferior has a thread doing a displaced |
1520 | step. */ | |
1521 | ||
1522 | static int | |
1523 | displaced_step_in_progress_any_inferior (void) | |
1524 | { | |
1525 | struct displaced_step_inferior_state *state; | |
1526 | ||
1527 | for (state = displaced_step_inferior_states; | |
1528 | state != NULL; | |
1529 | state = state->next) | |
1530 | if (!ptid_equal (state->step_ptid, null_ptid)) | |
1531 | return 1; | |
1532 | ||
1533 | return 0; | |
1534 | } | |
1535 | ||
8f572e5c PA |
1536 | /* Return true if process PID has a thread doing a displaced step. */ |
1537 | ||
1538 | static int | |
1539 | displaced_step_in_progress (int pid) | |
1540 | { | |
1541 | struct displaced_step_inferior_state *displaced; | |
1542 | ||
1543 | displaced = get_displaced_stepping_state (pid); | |
1544 | if (displaced != NULL && !ptid_equal (displaced->step_ptid, null_ptid)) | |
1545 | return 1; | |
1546 | ||
1547 | return 0; | |
1548 | } | |
1549 | ||
fc1cf338 PA |
1550 | /* Add a new displaced stepping state for process PID to the displaced |
1551 | stepping state list, or return a pointer to an already existing | |
1552 | entry, if it already exists. Never returns NULL. */ | |
1553 | ||
1554 | static struct displaced_step_inferior_state * | |
1555 | add_displaced_stepping_state (int pid) | |
1556 | { | |
1557 | struct displaced_step_inferior_state *state; | |
1558 | ||
1559 | for (state = displaced_step_inferior_states; | |
1560 | state != NULL; | |
1561 | state = state->next) | |
1562 | if (state->pid == pid) | |
1563 | return state; | |
237fc4c9 | 1564 | |
8d749320 | 1565 | state = XCNEW (struct displaced_step_inferior_state); |
fc1cf338 PA |
1566 | state->pid = pid; |
1567 | state->next = displaced_step_inferior_states; | |
1568 | displaced_step_inferior_states = state; | |
237fc4c9 | 1569 | |
fc1cf338 PA |
1570 | return state; |
1571 | } | |
1572 | ||
a42244db YQ |
1573 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1574 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1575 | return NULL. */ | |
1576 | ||
1577 | struct displaced_step_closure* | |
1578 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1579 | { | |
1580 | struct displaced_step_inferior_state *displaced | |
1581 | = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); | |
1582 | ||
1583 | /* If checking the mode of displaced instruction in copy area. */ | |
1584 | if (displaced && !ptid_equal (displaced->step_ptid, null_ptid) | |
1585 | && (displaced->step_copy == addr)) | |
1586 | return displaced->step_closure; | |
1587 | ||
1588 | return NULL; | |
1589 | } | |
1590 | ||
fc1cf338 | 1591 | /* Remove the displaced stepping state of process PID. */ |
237fc4c9 | 1592 | |
fc1cf338 PA |
1593 | static void |
1594 | remove_displaced_stepping_state (int pid) | |
1595 | { | |
1596 | struct displaced_step_inferior_state *it, **prev_next_p; | |
237fc4c9 | 1597 | |
fc1cf338 PA |
1598 | gdb_assert (pid != 0); |
1599 | ||
1600 | it = displaced_step_inferior_states; | |
1601 | prev_next_p = &displaced_step_inferior_states; | |
1602 | while (it) | |
1603 | { | |
1604 | if (it->pid == pid) | |
1605 | { | |
1606 | *prev_next_p = it->next; | |
1607 | xfree (it); | |
1608 | return; | |
1609 | } | |
1610 | ||
1611 | prev_next_p = &it->next; | |
1612 | it = *prev_next_p; | |
1613 | } | |
1614 | } | |
1615 | ||
1616 | static void | |
1617 | infrun_inferior_exit (struct inferior *inf) | |
1618 | { | |
1619 | remove_displaced_stepping_state (inf->pid); | |
1620 | } | |
237fc4c9 | 1621 | |
fff08868 HZ |
1622 | /* If ON, and the architecture supports it, GDB will use displaced |
1623 | stepping to step over breakpoints. If OFF, or if the architecture | |
1624 | doesn't support it, GDB will instead use the traditional | |
1625 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1626 | decide which technique to use to step over breakpoints depending on | |
1627 | which of all-stop or non-stop mode is active --- displaced stepping | |
1628 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1629 | ||
72d0e2c5 | 1630 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1631 | |
237fc4c9 PA |
1632 | static void |
1633 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1634 | struct cmd_list_element *c, | |
1635 | const char *value) | |
1636 | { | |
72d0e2c5 | 1637 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1638 | fprintf_filtered (file, |
1639 | _("Debugger's willingness to use displaced stepping " | |
1640 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1641 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1642 | else |
3e43a32a MS |
1643 | fprintf_filtered (file, |
1644 | _("Debugger's willingness to use displaced stepping " | |
1645 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1646 | } |
1647 | ||
fff08868 | 1648 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1649 | over breakpoints of thread TP. */ |
fff08868 | 1650 | |
237fc4c9 | 1651 | static int |
3fc8eb30 | 1652 | use_displaced_stepping (struct thread_info *tp) |
237fc4c9 | 1653 | { |
3fc8eb30 PA |
1654 | struct regcache *regcache = get_thread_regcache (tp->ptid); |
1655 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1656 | struct displaced_step_inferior_state *displaced_state; | |
1657 | ||
1658 | displaced_state = get_displaced_stepping_state (ptid_get_pid (tp->ptid)); | |
1659 | ||
fbea99ea PA |
1660 | return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO |
1661 | && target_is_non_stop_p ()) | |
72d0e2c5 | 1662 | || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) |
96429cc8 | 1663 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
3fc8eb30 PA |
1664 | && find_record_target () == NULL |
1665 | && (displaced_state == NULL | |
1666 | || !displaced_state->failed_before)); | |
237fc4c9 PA |
1667 | } |
1668 | ||
1669 | /* Clean out any stray displaced stepping state. */ | |
1670 | static void | |
fc1cf338 | 1671 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1672 | { |
1673 | /* Indicate that there is no cleanup pending. */ | |
fc1cf338 | 1674 | displaced->step_ptid = null_ptid; |
237fc4c9 | 1675 | |
fc1cf338 | 1676 | if (displaced->step_closure) |
237fc4c9 | 1677 | { |
fc1cf338 PA |
1678 | gdbarch_displaced_step_free_closure (displaced->step_gdbarch, |
1679 | displaced->step_closure); | |
1680 | displaced->step_closure = NULL; | |
237fc4c9 PA |
1681 | } |
1682 | } | |
1683 | ||
1684 | static void | |
fc1cf338 | 1685 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1686 | { |
fc1cf338 PA |
1687 | struct displaced_step_inferior_state *state = arg; |
1688 | ||
1689 | displaced_step_clear (state); | |
237fc4c9 PA |
1690 | } |
1691 | ||
1692 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1693 | void | |
1694 | displaced_step_dump_bytes (struct ui_file *file, | |
1695 | const gdb_byte *buf, | |
1696 | size_t len) | |
1697 | { | |
1698 | int i; | |
1699 | ||
1700 | for (i = 0; i < len; i++) | |
1701 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1702 | fputs_unfiltered ("\n", file); | |
1703 | } | |
1704 | ||
1705 | /* Prepare to single-step, using displaced stepping. | |
1706 | ||
1707 | Note that we cannot use displaced stepping when we have a signal to | |
1708 | deliver. If we have a signal to deliver and an instruction to step | |
1709 | over, then after the step, there will be no indication from the | |
1710 | target whether the thread entered a signal handler or ignored the | |
1711 | signal and stepped over the instruction successfully --- both cases | |
1712 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1713 | fixup, and in the second case we must --- but we can't tell which. | |
1714 | Comments in the code for 'random signals' in handle_inferior_event | |
1715 | explain how we handle this case instead. | |
1716 | ||
1717 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1718 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1719 | if this instruction can't be displaced stepped. */ | |
1720 | ||
237fc4c9 | 1721 | static int |
3fc8eb30 | 1722 | displaced_step_prepare_throw (ptid_t ptid) |
237fc4c9 | 1723 | { |
ad53cd71 | 1724 | struct cleanup *old_cleanups, *ignore_cleanups; |
c1e36e3e | 1725 | struct thread_info *tp = find_thread_ptid (ptid); |
237fc4c9 PA |
1726 | struct regcache *regcache = get_thread_regcache (ptid); |
1727 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1728 | CORE_ADDR original, copy; | |
1729 | ULONGEST len; | |
1730 | struct displaced_step_closure *closure; | |
fc1cf338 | 1731 | struct displaced_step_inferior_state *displaced; |
9e529e1d | 1732 | int status; |
237fc4c9 PA |
1733 | |
1734 | /* We should never reach this function if the architecture does not | |
1735 | support displaced stepping. */ | |
1736 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1737 | ||
c2829269 PA |
1738 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1739 | gdb_assert (tp->control.trap_expected); | |
1740 | ||
c1e36e3e PA |
1741 | /* Disable range stepping while executing in the scratch pad. We |
1742 | want a single-step even if executing the displaced instruction in | |
1743 | the scratch buffer lands within the stepping range (e.g., a | |
1744 | jump/branch). */ | |
1745 | tp->control.may_range_step = 0; | |
1746 | ||
fc1cf338 PA |
1747 | /* We have to displaced step one thread at a time, as we only have |
1748 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1749 | |
fc1cf338 PA |
1750 | displaced = add_displaced_stepping_state (ptid_get_pid (ptid)); |
1751 | ||
1752 | if (!ptid_equal (displaced->step_ptid, null_ptid)) | |
237fc4c9 PA |
1753 | { |
1754 | /* Already waiting for a displaced step to finish. Defer this | |
1755 | request and place in queue. */ | |
237fc4c9 PA |
1756 | |
1757 | if (debug_displaced) | |
1758 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1759 | "displaced: deferring step of %s\n", |
237fc4c9 PA |
1760 | target_pid_to_str (ptid)); |
1761 | ||
c2829269 | 1762 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1763 | return 0; |
1764 | } | |
1765 | else | |
1766 | { | |
1767 | if (debug_displaced) | |
1768 | fprintf_unfiltered (gdb_stdlog, | |
1769 | "displaced: stepping %s now\n", | |
1770 | target_pid_to_str (ptid)); | |
1771 | } | |
1772 | ||
fc1cf338 | 1773 | displaced_step_clear (displaced); |
237fc4c9 | 1774 | |
ad53cd71 PA |
1775 | old_cleanups = save_inferior_ptid (); |
1776 | inferior_ptid = ptid; | |
1777 | ||
515630c5 | 1778 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1779 | |
1780 | copy = gdbarch_displaced_step_location (gdbarch); | |
1781 | len = gdbarch_max_insn_length (gdbarch); | |
1782 | ||
1783 | /* Save the original contents of the copy area. */ | |
fc1cf338 | 1784 | displaced->step_saved_copy = xmalloc (len); |
ad53cd71 | 1785 | ignore_cleanups = make_cleanup (free_current_contents, |
fc1cf338 | 1786 | &displaced->step_saved_copy); |
9e529e1d JK |
1787 | status = target_read_memory (copy, displaced->step_saved_copy, len); |
1788 | if (status != 0) | |
1789 | throw_error (MEMORY_ERROR, | |
1790 | _("Error accessing memory address %s (%s) for " | |
1791 | "displaced-stepping scratch space."), | |
1792 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1793 | if (debug_displaced) |
1794 | { | |
5af949e3 UW |
1795 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1796 | paddress (gdbarch, copy)); | |
fc1cf338 PA |
1797 | displaced_step_dump_bytes (gdb_stdlog, |
1798 | displaced->step_saved_copy, | |
1799 | len); | |
237fc4c9 PA |
1800 | }; |
1801 | ||
1802 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1803 | original, copy, regcache); |
7f03bd92 PA |
1804 | if (closure == NULL) |
1805 | { | |
1806 | /* The architecture doesn't know how or want to displaced step | |
1807 | this instruction or instruction sequence. Fallback to | |
1808 | stepping over the breakpoint in-line. */ | |
1809 | do_cleanups (old_cleanups); | |
1810 | return -1; | |
1811 | } | |
237fc4c9 | 1812 | |
9f5a595d UW |
1813 | /* Save the information we need to fix things up if the step |
1814 | succeeds. */ | |
fc1cf338 PA |
1815 | displaced->step_ptid = ptid; |
1816 | displaced->step_gdbarch = gdbarch; | |
1817 | displaced->step_closure = closure; | |
1818 | displaced->step_original = original; | |
1819 | displaced->step_copy = copy; | |
9f5a595d | 1820 | |
fc1cf338 | 1821 | make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1822 | |
1823 | /* Resume execution at the copy. */ | |
515630c5 | 1824 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1825 | |
ad53cd71 PA |
1826 | discard_cleanups (ignore_cleanups); |
1827 | ||
1828 | do_cleanups (old_cleanups); | |
237fc4c9 PA |
1829 | |
1830 | if (debug_displaced) | |
5af949e3 UW |
1831 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1832 | paddress (gdbarch, copy)); | |
237fc4c9 | 1833 | |
237fc4c9 PA |
1834 | return 1; |
1835 | } | |
1836 | ||
3fc8eb30 PA |
1837 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1838 | attempts at displaced stepping if we get a memory error. */ | |
1839 | ||
1840 | static int | |
1841 | displaced_step_prepare (ptid_t ptid) | |
1842 | { | |
1843 | int prepared = -1; | |
1844 | ||
1845 | TRY | |
1846 | { | |
1847 | prepared = displaced_step_prepare_throw (ptid); | |
1848 | } | |
1849 | CATCH (ex, RETURN_MASK_ERROR) | |
1850 | { | |
1851 | struct displaced_step_inferior_state *displaced_state; | |
1852 | ||
1853 | if (ex.error != MEMORY_ERROR) | |
1854 | throw_exception (ex); | |
1855 | ||
1856 | if (debug_infrun) | |
1857 | { | |
1858 | fprintf_unfiltered (gdb_stdlog, | |
1859 | "infrun: disabling displaced stepping: %s\n", | |
1860 | ex.message); | |
1861 | } | |
1862 | ||
1863 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1864 | "auto". */ | |
1865 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1866 | { | |
fd7dcb94 | 1867 | warning (_("disabling displaced stepping: %s"), |
3fc8eb30 PA |
1868 | ex.message); |
1869 | } | |
1870 | ||
1871 | /* Disable further displaced stepping attempts. */ | |
1872 | displaced_state | |
1873 | = get_displaced_stepping_state (ptid_get_pid (ptid)); | |
1874 | displaced_state->failed_before = 1; | |
1875 | } | |
1876 | END_CATCH | |
1877 | ||
1878 | return prepared; | |
1879 | } | |
1880 | ||
237fc4c9 | 1881 | static void |
3e43a32a MS |
1882 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1883 | const gdb_byte *myaddr, int len) | |
237fc4c9 PA |
1884 | { |
1885 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
abbb1732 | 1886 | |
237fc4c9 PA |
1887 | inferior_ptid = ptid; |
1888 | write_memory (memaddr, myaddr, len); | |
1889 | do_cleanups (ptid_cleanup); | |
1890 | } | |
1891 | ||
e2d96639 YQ |
1892 | /* Restore the contents of the copy area for thread PTID. */ |
1893 | ||
1894 | static void | |
1895 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1896 | ptid_t ptid) | |
1897 | { | |
1898 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1899 | ||
1900 | write_memory_ptid (ptid, displaced->step_copy, | |
1901 | displaced->step_saved_copy, len); | |
1902 | if (debug_displaced) | |
1903 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
1904 | target_pid_to_str (ptid), | |
1905 | paddress (displaced->step_gdbarch, | |
1906 | displaced->step_copy)); | |
1907 | } | |
1908 | ||
372316f1 PA |
1909 | /* If we displaced stepped an instruction successfully, adjust |
1910 | registers and memory to yield the same effect the instruction would | |
1911 | have had if we had executed it at its original address, and return | |
1912 | 1. If the instruction didn't complete, relocate the PC and return | |
1913 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1914 | ||
1915 | static int | |
2ea28649 | 1916 | displaced_step_fixup (ptid_t event_ptid, enum gdb_signal signal) |
237fc4c9 PA |
1917 | { |
1918 | struct cleanup *old_cleanups; | |
fc1cf338 PA |
1919 | struct displaced_step_inferior_state *displaced |
1920 | = get_displaced_stepping_state (ptid_get_pid (event_ptid)); | |
372316f1 | 1921 | int ret; |
fc1cf338 PA |
1922 | |
1923 | /* Was any thread of this process doing a displaced step? */ | |
1924 | if (displaced == NULL) | |
372316f1 | 1925 | return 0; |
237fc4c9 PA |
1926 | |
1927 | /* Was this event for the pid we displaced? */ | |
fc1cf338 PA |
1928 | if (ptid_equal (displaced->step_ptid, null_ptid) |
1929 | || ! ptid_equal (displaced->step_ptid, event_ptid)) | |
372316f1 | 1930 | return 0; |
237fc4c9 | 1931 | |
fc1cf338 | 1932 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 | 1933 | |
e2d96639 | 1934 | displaced_step_restore (displaced, displaced->step_ptid); |
237fc4c9 | 1935 | |
cb71640d PA |
1936 | /* Fixup may need to read memory/registers. Switch to the thread |
1937 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
1938 | the current thread. */ | |
1939 | switch_to_thread (event_ptid); | |
1940 | ||
237fc4c9 | 1941 | /* Did the instruction complete successfully? */ |
cb71640d PA |
1942 | if (signal == GDB_SIGNAL_TRAP |
1943 | && !(target_stopped_by_watchpoint () | |
1944 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
1945 | || target_have_steppable_watchpoint))) | |
237fc4c9 PA |
1946 | { |
1947 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
1948 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
1949 | displaced->step_closure, | |
1950 | displaced->step_original, | |
1951 | displaced->step_copy, | |
1952 | get_thread_regcache (displaced->step_ptid)); | |
372316f1 | 1953 | ret = 1; |
237fc4c9 PA |
1954 | } |
1955 | else | |
1956 | { | |
1957 | /* Since the instruction didn't complete, all we can do is | |
1958 | relocate the PC. */ | |
515630c5 UW |
1959 | struct regcache *regcache = get_thread_regcache (event_ptid); |
1960 | CORE_ADDR pc = regcache_read_pc (regcache); | |
abbb1732 | 1961 | |
fc1cf338 | 1962 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1963 | regcache_write_pc (regcache, pc); |
372316f1 | 1964 | ret = -1; |
237fc4c9 PA |
1965 | } |
1966 | ||
1967 | do_cleanups (old_cleanups); | |
1968 | ||
fc1cf338 | 1969 | displaced->step_ptid = null_ptid; |
372316f1 PA |
1970 | |
1971 | return ret; | |
c2829269 | 1972 | } |
1c5cfe86 | 1973 | |
4d9d9d04 PA |
1974 | /* Data to be passed around while handling an event. This data is |
1975 | discarded between events. */ | |
1976 | struct execution_control_state | |
1977 | { | |
1978 | ptid_t ptid; | |
1979 | /* The thread that got the event, if this was a thread event; NULL | |
1980 | otherwise. */ | |
1981 | struct thread_info *event_thread; | |
1982 | ||
1983 | struct target_waitstatus ws; | |
1984 | int stop_func_filled_in; | |
1985 | CORE_ADDR stop_func_start; | |
1986 | CORE_ADDR stop_func_end; | |
1987 | const char *stop_func_name; | |
1988 | int wait_some_more; | |
1989 | ||
1990 | /* True if the event thread hit the single-step breakpoint of | |
1991 | another thread. Thus the event doesn't cause a stop, the thread | |
1992 | needs to be single-stepped past the single-step breakpoint before | |
1993 | we can switch back to the original stepping thread. */ | |
1994 | int hit_singlestep_breakpoint; | |
1995 | }; | |
1996 | ||
1997 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1998 | |
1999 | static void | |
4d9d9d04 PA |
2000 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
2001 | { | |
2002 | memset (ecs, 0, sizeof (*ecs)); | |
2003 | ecs->event_thread = tp; | |
2004 | ecs->ptid = tp->ptid; | |
2005 | } | |
2006 | ||
2007 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
2008 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 2009 | static int keep_going_stepped_thread (struct thread_info *tp); |
4d9d9d04 | 2010 | static int thread_still_needs_step_over (struct thread_info *tp); |
3fc8eb30 | 2011 | static void stop_all_threads (void); |
4d9d9d04 PA |
2012 | |
2013 | /* Are there any pending step-over requests? If so, run all we can | |
2014 | now and return true. Otherwise, return false. */ | |
2015 | ||
2016 | static int | |
c2829269 PA |
2017 | start_step_over (void) |
2018 | { | |
2019 | struct thread_info *tp, *next; | |
2020 | ||
372316f1 PA |
2021 | /* Don't start a new step-over if we already have an in-line |
2022 | step-over operation ongoing. */ | |
2023 | if (step_over_info_valid_p ()) | |
2024 | return 0; | |
2025 | ||
c2829269 | 2026 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 2027 | { |
4d9d9d04 PA |
2028 | struct execution_control_state ecss; |
2029 | struct execution_control_state *ecs = &ecss; | |
372316f1 PA |
2030 | enum step_over_what step_what; |
2031 | int must_be_in_line; | |
c2829269 PA |
2032 | |
2033 | next = thread_step_over_chain_next (tp); | |
237fc4c9 | 2034 | |
c2829269 PA |
2035 | /* If this inferior already has a displaced step in process, |
2036 | don't start a new one. */ | |
4d9d9d04 | 2037 | if (displaced_step_in_progress (ptid_get_pid (tp->ptid))) |
c2829269 PA |
2038 | continue; |
2039 | ||
372316f1 PA |
2040 | step_what = thread_still_needs_step_over (tp); |
2041 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
2042 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 2043 | && !use_displaced_stepping (tp))); |
372316f1 PA |
2044 | |
2045 | /* We currently stop all threads of all processes to step-over | |
2046 | in-line. If we need to start a new in-line step-over, let | |
2047 | any pending displaced steps finish first. */ | |
2048 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
2049 | return 0; | |
2050 | ||
c2829269 PA |
2051 | thread_step_over_chain_remove (tp); |
2052 | ||
2053 | if (step_over_queue_head == NULL) | |
2054 | { | |
2055 | if (debug_infrun) | |
2056 | fprintf_unfiltered (gdb_stdlog, | |
2057 | "infrun: step-over queue now empty\n"); | |
2058 | } | |
2059 | ||
372316f1 PA |
2060 | if (tp->control.trap_expected |
2061 | || tp->resumed | |
2062 | || tp->executing) | |
ad53cd71 | 2063 | { |
4d9d9d04 PA |
2064 | internal_error (__FILE__, __LINE__, |
2065 | "[%s] has inconsistent state: " | |
372316f1 | 2066 | "trap_expected=%d, resumed=%d, executing=%d\n", |
4d9d9d04 PA |
2067 | target_pid_to_str (tp->ptid), |
2068 | tp->control.trap_expected, | |
372316f1 | 2069 | tp->resumed, |
4d9d9d04 | 2070 | tp->executing); |
ad53cd71 | 2071 | } |
1c5cfe86 | 2072 | |
4d9d9d04 PA |
2073 | if (debug_infrun) |
2074 | fprintf_unfiltered (gdb_stdlog, | |
2075 | "infrun: resuming [%s] for step-over\n", | |
2076 | target_pid_to_str (tp->ptid)); | |
2077 | ||
2078 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2079 | is no longer inserted. In all-stop, we want to keep looking | |
2080 | for a thread that needs a step-over instead of resuming TP, | |
2081 | because we wouldn't be able to resume anything else until the | |
2082 | target stops again. In non-stop, the resume always resumes | |
2083 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2084 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2085 | continue; |
8550d3b3 | 2086 | |
4d9d9d04 PA |
2087 | switch_to_thread (tp->ptid); |
2088 | reset_ecs (ecs, tp); | |
2089 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2090 | |
4d9d9d04 PA |
2091 | if (!ecs->wait_some_more) |
2092 | error (_("Command aborted.")); | |
1c5cfe86 | 2093 | |
372316f1 PA |
2094 | gdb_assert (tp->resumed); |
2095 | ||
2096 | /* If we started a new in-line step-over, we're done. */ | |
2097 | if (step_over_info_valid_p ()) | |
2098 | { | |
2099 | gdb_assert (tp->control.trap_expected); | |
2100 | return 1; | |
2101 | } | |
2102 | ||
fbea99ea | 2103 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2104 | { |
2105 | /* On all-stop, shouldn't have resumed unless we needed a | |
2106 | step over. */ | |
2107 | gdb_assert (tp->control.trap_expected | |
2108 | || tp->step_after_step_resume_breakpoint); | |
2109 | ||
2110 | /* With remote targets (at least), in all-stop, we can't | |
2111 | issue any further remote commands until the program stops | |
2112 | again. */ | |
2113 | return 1; | |
1c5cfe86 | 2114 | } |
c2829269 | 2115 | |
4d9d9d04 PA |
2116 | /* Either the thread no longer needed a step-over, or a new |
2117 | displaced stepping sequence started. Even in the latter | |
2118 | case, continue looking. Maybe we can also start another | |
2119 | displaced step on a thread of other process. */ | |
237fc4c9 | 2120 | } |
4d9d9d04 PA |
2121 | |
2122 | return 0; | |
237fc4c9 PA |
2123 | } |
2124 | ||
5231c1fd PA |
2125 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2126 | holding OLD_PTID. */ | |
2127 | static void | |
2128 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2129 | { | |
2130 | struct displaced_step_request *it; | |
fc1cf338 | 2131 | struct displaced_step_inferior_state *displaced; |
5231c1fd PA |
2132 | |
2133 | if (ptid_equal (inferior_ptid, old_ptid)) | |
2134 | inferior_ptid = new_ptid; | |
2135 | ||
fc1cf338 PA |
2136 | for (displaced = displaced_step_inferior_states; |
2137 | displaced; | |
2138 | displaced = displaced->next) | |
2139 | { | |
2140 | if (ptid_equal (displaced->step_ptid, old_ptid)) | |
2141 | displaced->step_ptid = new_ptid; | |
fc1cf338 | 2142 | } |
5231c1fd PA |
2143 | } |
2144 | ||
237fc4c9 PA |
2145 | \f |
2146 | /* Resuming. */ | |
c906108c SS |
2147 | |
2148 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 2149 | static void |
74b7792f | 2150 | resume_cleanups (void *ignore) |
c906108c | 2151 | { |
34b7e8a6 PA |
2152 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2153 | delete_single_step_breakpoints (inferior_thread ()); | |
7c16b83e | 2154 | |
c906108c SS |
2155 | normal_stop (); |
2156 | } | |
2157 | ||
53904c9e AC |
2158 | static const char schedlock_off[] = "off"; |
2159 | static const char schedlock_on[] = "on"; | |
2160 | static const char schedlock_step[] = "step"; | |
40478521 | 2161 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2162 | schedlock_off, |
2163 | schedlock_on, | |
2164 | schedlock_step, | |
2165 | NULL | |
2166 | }; | |
920d2a44 AC |
2167 | static const char *scheduler_mode = schedlock_off; |
2168 | static void | |
2169 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2170 | struct cmd_list_element *c, const char *value) | |
2171 | { | |
3e43a32a MS |
2172 | fprintf_filtered (file, |
2173 | _("Mode for locking scheduler " | |
2174 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2175 | value); |
2176 | } | |
c906108c SS |
2177 | |
2178 | static void | |
96baa820 | 2179 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2180 | { |
eefe576e AC |
2181 | if (!target_can_lock_scheduler) |
2182 | { | |
2183 | scheduler_mode = schedlock_off; | |
2184 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2185 | } | |
c906108c SS |
2186 | } |
2187 | ||
d4db2f36 PA |
2188 | /* True if execution commands resume all threads of all processes by |
2189 | default; otherwise, resume only threads of the current inferior | |
2190 | process. */ | |
2191 | int sched_multi = 0; | |
2192 | ||
2facfe5c DD |
2193 | /* Try to setup for software single stepping over the specified location. |
2194 | Return 1 if target_resume() should use hardware single step. | |
2195 | ||
2196 | GDBARCH the current gdbarch. | |
2197 | PC the location to step over. */ | |
2198 | ||
2199 | static int | |
2200 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2201 | { | |
2202 | int hw_step = 1; | |
2203 | ||
f02253f1 HZ |
2204 | if (execution_direction == EXEC_FORWARD |
2205 | && gdbarch_software_single_step_p (gdbarch) | |
99e40580 | 2206 | && gdbarch_software_single_step (gdbarch, get_current_frame ())) |
2facfe5c | 2207 | { |
99e40580 | 2208 | hw_step = 0; |
2facfe5c DD |
2209 | } |
2210 | return hw_step; | |
2211 | } | |
c906108c | 2212 | |
f3263aa4 PA |
2213 | /* See infrun.h. */ |
2214 | ||
09cee04b PA |
2215 | ptid_t |
2216 | user_visible_resume_ptid (int step) | |
2217 | { | |
f3263aa4 | 2218 | ptid_t resume_ptid; |
09cee04b | 2219 | |
09cee04b PA |
2220 | if (non_stop) |
2221 | { | |
2222 | /* With non-stop mode on, threads are always handled | |
2223 | individually. */ | |
2224 | resume_ptid = inferior_ptid; | |
2225 | } | |
2226 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2227 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2228 | { |
f3263aa4 PA |
2229 | /* User-settable 'scheduler' mode requires solo thread |
2230 | resume. */ | |
09cee04b PA |
2231 | resume_ptid = inferior_ptid; |
2232 | } | |
f3263aa4 PA |
2233 | else if (!sched_multi && target_supports_multi_process ()) |
2234 | { | |
2235 | /* Resume all threads of the current process (and none of other | |
2236 | processes). */ | |
2237 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
2238 | } | |
2239 | else | |
2240 | { | |
2241 | /* Resume all threads of all processes. */ | |
2242 | resume_ptid = RESUME_ALL; | |
2243 | } | |
09cee04b PA |
2244 | |
2245 | return resume_ptid; | |
2246 | } | |
2247 | ||
fbea99ea PA |
2248 | /* Return a ptid representing the set of threads that we will resume, |
2249 | in the perspective of the target, assuming run control handling | |
2250 | does not require leaving some threads stopped (e.g., stepping past | |
2251 | breakpoint). USER_STEP indicates whether we're about to start the | |
2252 | target for a stepping command. */ | |
2253 | ||
2254 | static ptid_t | |
2255 | internal_resume_ptid (int user_step) | |
2256 | { | |
2257 | /* In non-stop, we always control threads individually. Note that | |
2258 | the target may always work in non-stop mode even with "set | |
2259 | non-stop off", in which case user_visible_resume_ptid could | |
2260 | return a wildcard ptid. */ | |
2261 | if (target_is_non_stop_p ()) | |
2262 | return inferior_ptid; | |
2263 | else | |
2264 | return user_visible_resume_ptid (user_step); | |
2265 | } | |
2266 | ||
64ce06e4 PA |
2267 | /* Wrapper for target_resume, that handles infrun-specific |
2268 | bookkeeping. */ | |
2269 | ||
2270 | static void | |
2271 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2272 | { | |
2273 | struct thread_info *tp = inferior_thread (); | |
2274 | ||
2275 | /* Install inferior's terminal modes. */ | |
2276 | target_terminal_inferior (); | |
2277 | ||
2278 | /* Avoid confusing the next resume, if the next stop/resume | |
2279 | happens to apply to another thread. */ | |
2280 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2281 | ||
8f572e5c PA |
2282 | /* Advise target which signals may be handled silently. |
2283 | ||
2284 | If we have removed breakpoints because we are stepping over one | |
2285 | in-line (in any thread), we need to receive all signals to avoid | |
2286 | accidentally skipping a breakpoint during execution of a signal | |
2287 | handler. | |
2288 | ||
2289 | Likewise if we're displaced stepping, otherwise a trap for a | |
2290 | breakpoint in a signal handler might be confused with the | |
2291 | displaced step finishing. We don't make the displaced_step_fixup | |
2292 | step distinguish the cases instead, because: | |
2293 | ||
2294 | - a backtrace while stopped in the signal handler would show the | |
2295 | scratch pad as frame older than the signal handler, instead of | |
2296 | the real mainline code. | |
2297 | ||
2298 | - when the thread is later resumed, the signal handler would | |
2299 | return to the scratch pad area, which would no longer be | |
2300 | valid. */ | |
2301 | if (step_over_info_valid_p () | |
2302 | || displaced_step_in_progress (ptid_get_pid (tp->ptid))) | |
64ce06e4 PA |
2303 | target_pass_signals (0, NULL); |
2304 | else | |
2305 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
2306 | ||
2307 | target_resume (resume_ptid, step, sig); | |
2308 | } | |
2309 | ||
c906108c SS |
2310 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
2311 | wants to interrupt some lengthy single-stepping operation | |
2312 | (for child processes, the SIGINT goes to the inferior, and so | |
2313 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
2314 | other targets, that's not true). | |
2315 | ||
c906108c SS |
2316 | SIG is the signal to give the inferior (zero for none). */ |
2317 | void | |
64ce06e4 | 2318 | resume (enum gdb_signal sig) |
c906108c | 2319 | { |
74b7792f | 2320 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
2321 | struct regcache *regcache = get_current_regcache (); |
2322 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4e1c45ea | 2323 | struct thread_info *tp = inferior_thread (); |
515630c5 | 2324 | CORE_ADDR pc = regcache_read_pc (regcache); |
6c95b8df | 2325 | struct address_space *aspace = get_regcache_aspace (regcache); |
b0f16a3e | 2326 | ptid_t resume_ptid; |
856e7dd6 PA |
2327 | /* This represents the user's step vs continue request. When |
2328 | deciding whether "set scheduler-locking step" applies, it's the | |
2329 | user's intention that counts. */ | |
2330 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2331 | /* This represents what we'll actually request the target to do. |
2332 | This can decay from a step to a continue, if e.g., we need to | |
2333 | implement single-stepping with breakpoints (software | |
2334 | single-step). */ | |
6b403daa | 2335 | int step; |
c7e8a53c | 2336 | |
c2829269 PA |
2337 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2338 | ||
c906108c SS |
2339 | QUIT; |
2340 | ||
372316f1 PA |
2341 | if (tp->suspend.waitstatus_pending_p) |
2342 | { | |
2343 | if (debug_infrun) | |
2344 | { | |
2345 | char *statstr; | |
2346 | ||
2347 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
2348 | fprintf_unfiltered (gdb_stdlog, | |
2349 | "infrun: resume: thread %s has pending wait status %s " | |
2350 | "(currently_stepping=%d).\n", | |
2351 | target_pid_to_str (tp->ptid), statstr, | |
2352 | currently_stepping (tp)); | |
2353 | xfree (statstr); | |
2354 | } | |
2355 | ||
2356 | tp->resumed = 1; | |
2357 | ||
2358 | /* FIXME: What should we do if we are supposed to resume this | |
2359 | thread with a signal? Maybe we should maintain a queue of | |
2360 | pending signals to deliver. */ | |
2361 | if (sig != GDB_SIGNAL_0) | |
2362 | { | |
fd7dcb94 | 2363 | warning (_("Couldn't deliver signal %s to %s."), |
372316f1 PA |
2364 | gdb_signal_to_name (sig), target_pid_to_str (tp->ptid)); |
2365 | } | |
2366 | ||
2367 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2368 | discard_cleanups (old_cleanups); | |
2369 | ||
2370 | if (target_can_async_p ()) | |
2371 | target_async (1); | |
2372 | return; | |
2373 | } | |
2374 | ||
2375 | tp->stepped_breakpoint = 0; | |
2376 | ||
6b403daa PA |
2377 | /* Depends on stepped_breakpoint. */ |
2378 | step = currently_stepping (tp); | |
2379 | ||
74609e71 YQ |
2380 | if (current_inferior ()->waiting_for_vfork_done) |
2381 | { | |
48f9886d PA |
2382 | /* Don't try to single-step a vfork parent that is waiting for |
2383 | the child to get out of the shared memory region (by exec'ing | |
2384 | or exiting). This is particularly important on software | |
2385 | single-step archs, as the child process would trip on the | |
2386 | software single step breakpoint inserted for the parent | |
2387 | process. Since the parent will not actually execute any | |
2388 | instruction until the child is out of the shared region (such | |
2389 | are vfork's semantics), it is safe to simply continue it. | |
2390 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2391 | the parent, and tell it to `keep_going', which automatically | |
2392 | re-sets it stepping. */ | |
74609e71 YQ |
2393 | if (debug_infrun) |
2394 | fprintf_unfiltered (gdb_stdlog, | |
2395 | "infrun: resume : clear step\n"); | |
a09dd441 | 2396 | step = 0; |
74609e71 YQ |
2397 | } |
2398 | ||
527159b7 | 2399 | if (debug_infrun) |
237fc4c9 | 2400 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 2401 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 2402 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
2403 | step, gdb_signal_to_symbol_string (sig), |
2404 | tp->control.trap_expected, | |
0d9a9a5f PA |
2405 | target_pid_to_str (inferior_ptid), |
2406 | paddress (gdbarch, pc)); | |
c906108c | 2407 | |
c2c6d25f JM |
2408 | /* Normally, by the time we reach `resume', the breakpoints are either |
2409 | removed or inserted, as appropriate. The exception is if we're sitting | |
2410 | at a permanent breakpoint; we need to step over it, but permanent | |
2411 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2412 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2413 | { |
af48d08f PA |
2414 | if (sig != GDB_SIGNAL_0) |
2415 | { | |
2416 | /* We have a signal to pass to the inferior. The resume | |
2417 | may, or may not take us to the signal handler. If this | |
2418 | is a step, we'll need to stop in the signal handler, if | |
2419 | there's one, (if the target supports stepping into | |
2420 | handlers), or in the next mainline instruction, if | |
2421 | there's no handler. If this is a continue, we need to be | |
2422 | sure to run the handler with all breakpoints inserted. | |
2423 | In all cases, set a breakpoint at the current address | |
2424 | (where the handler returns to), and once that breakpoint | |
2425 | is hit, resume skipping the permanent breakpoint. If | |
2426 | that breakpoint isn't hit, then we've stepped into the | |
2427 | signal handler (or hit some other event). We'll delete | |
2428 | the step-resume breakpoint then. */ | |
2429 | ||
2430 | if (debug_infrun) | |
2431 | fprintf_unfiltered (gdb_stdlog, | |
2432 | "infrun: resume: skipping permanent breakpoint, " | |
2433 | "deliver signal first\n"); | |
2434 | ||
2435 | clear_step_over_info (); | |
2436 | tp->control.trap_expected = 0; | |
2437 | ||
2438 | if (tp->control.step_resume_breakpoint == NULL) | |
2439 | { | |
2440 | /* Set a "high-priority" step-resume, as we don't want | |
2441 | user breakpoints at PC to trigger (again) when this | |
2442 | hits. */ | |
2443 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2444 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2445 | ||
2446 | tp->step_after_step_resume_breakpoint = step; | |
2447 | } | |
2448 | ||
2449 | insert_breakpoints (); | |
2450 | } | |
2451 | else | |
2452 | { | |
2453 | /* There's no signal to pass, we can go ahead and skip the | |
2454 | permanent breakpoint manually. */ | |
2455 | if (debug_infrun) | |
2456 | fprintf_unfiltered (gdb_stdlog, | |
2457 | "infrun: resume: skipping permanent breakpoint\n"); | |
2458 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
2459 | /* Update pc to reflect the new address from which we will | |
2460 | execute instructions. */ | |
2461 | pc = regcache_read_pc (regcache); | |
2462 | ||
2463 | if (step) | |
2464 | { | |
2465 | /* We've already advanced the PC, so the stepping part | |
2466 | is done. Now we need to arrange for a trap to be | |
2467 | reported to handle_inferior_event. Set a breakpoint | |
2468 | at the current PC, and run to it. Don't update | |
2469 | prev_pc, because if we end in | |
44a1ee51 PA |
2470 | switch_back_to_stepped_thread, we want the "expected |
2471 | thread advanced also" branch to be taken. IOW, we | |
2472 | don't want this thread to step further from PC | |
af48d08f | 2473 | (overstep). */ |
1ac806b8 | 2474 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2475 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2476 | insert_breakpoints (); | |
2477 | ||
fbea99ea | 2478 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2479 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
af48d08f | 2480 | discard_cleanups (old_cleanups); |
372316f1 | 2481 | tp->resumed = 1; |
af48d08f PA |
2482 | return; |
2483 | } | |
2484 | } | |
6d350bb5 | 2485 | } |
c2c6d25f | 2486 | |
c1e36e3e PA |
2487 | /* If we have a breakpoint to step over, make sure to do a single |
2488 | step only. Same if we have software watchpoints. */ | |
2489 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2490 | tp->control.may_range_step = 0; | |
2491 | ||
237fc4c9 PA |
2492 | /* If enabled, step over breakpoints by executing a copy of the |
2493 | instruction at a different address. | |
2494 | ||
2495 | We can't use displaced stepping when we have a signal to deliver; | |
2496 | the comments for displaced_step_prepare explain why. The | |
2497 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2498 | signals' explain what we do instead. |
2499 | ||
2500 | We can't use displaced stepping when we are waiting for vfork_done | |
2501 | event, displaced stepping breaks the vfork child similarly as single | |
2502 | step software breakpoint. */ | |
3fc8eb30 PA |
2503 | if (tp->control.trap_expected |
2504 | && use_displaced_stepping (tp) | |
cb71640d | 2505 | && !step_over_info_valid_p () |
a493e3e2 | 2506 | && sig == GDB_SIGNAL_0 |
74609e71 | 2507 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2508 | { |
3fc8eb30 | 2509 | int prepared = displaced_step_prepare (inferior_ptid); |
fc1cf338 | 2510 | |
3fc8eb30 | 2511 | if (prepared == 0) |
d56b7306 | 2512 | { |
4d9d9d04 PA |
2513 | if (debug_infrun) |
2514 | fprintf_unfiltered (gdb_stdlog, | |
2515 | "Got placed in step-over queue\n"); | |
2516 | ||
2517 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2518 | discard_cleanups (old_cleanups); |
2519 | return; | |
2520 | } | |
3fc8eb30 PA |
2521 | else if (prepared < 0) |
2522 | { | |
2523 | /* Fallback to stepping over the breakpoint in-line. */ | |
2524 | ||
2525 | if (target_is_non_stop_p ()) | |
2526 | stop_all_threads (); | |
2527 | ||
2528 | set_step_over_info (get_regcache_aspace (regcache), | |
2529 | regcache_read_pc (regcache), 0); | |
2530 | ||
2531 | step = maybe_software_singlestep (gdbarch, pc); | |
2532 | ||
2533 | insert_breakpoints (); | |
2534 | } | |
2535 | else if (prepared > 0) | |
2536 | { | |
2537 | struct displaced_step_inferior_state *displaced; | |
99e40580 | 2538 | |
3fc8eb30 PA |
2539 | /* Update pc to reflect the new address from which we will |
2540 | execute instructions due to displaced stepping. */ | |
2541 | pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); | |
ca7781d2 | 2542 | |
3fc8eb30 PA |
2543 | displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); |
2544 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, | |
2545 | displaced->step_closure); | |
2546 | } | |
237fc4c9 PA |
2547 | } |
2548 | ||
2facfe5c | 2549 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2550 | else if (step) |
2facfe5c | 2551 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2552 | |
30852783 UW |
2553 | /* Currently, our software single-step implementation leads to different |
2554 | results than hardware single-stepping in one situation: when stepping | |
2555 | into delivering a signal which has an associated signal handler, | |
2556 | hardware single-step will stop at the first instruction of the handler, | |
2557 | while software single-step will simply skip execution of the handler. | |
2558 | ||
2559 | For now, this difference in behavior is accepted since there is no | |
2560 | easy way to actually implement single-stepping into a signal handler | |
2561 | without kernel support. | |
2562 | ||
2563 | However, there is one scenario where this difference leads to follow-on | |
2564 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2565 | and then single-stepping. In this case, the software single-step | |
2566 | behavior means that even if there is a *breakpoint* in the signal | |
2567 | handler, GDB still would not stop. | |
2568 | ||
2569 | Fortunately, we can at least fix this particular issue. We detect | |
2570 | here the case where we are about to deliver a signal while software | |
2571 | single-stepping with breakpoints removed. In this situation, we | |
2572 | revert the decisions to remove all breakpoints and insert single- | |
2573 | step breakpoints, and instead we install a step-resume breakpoint | |
2574 | at the current address, deliver the signal without stepping, and | |
2575 | once we arrive back at the step-resume breakpoint, actually step | |
2576 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2577 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2578 | && sig != GDB_SIGNAL_0 |
2579 | && step_over_info_valid_p ()) | |
30852783 UW |
2580 | { |
2581 | /* If we have nested signals or a pending signal is delivered | |
2582 | immediately after a handler returns, might might already have | |
2583 | a step-resume breakpoint set on the earlier handler. We cannot | |
2584 | set another step-resume breakpoint; just continue on until the | |
2585 | original breakpoint is hit. */ | |
2586 | if (tp->control.step_resume_breakpoint == NULL) | |
2587 | { | |
2c03e5be | 2588 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2589 | tp->step_after_step_resume_breakpoint = 1; |
2590 | } | |
2591 | ||
34b7e8a6 | 2592 | delete_single_step_breakpoints (tp); |
30852783 | 2593 | |
31e77af2 | 2594 | clear_step_over_info (); |
30852783 | 2595 | tp->control.trap_expected = 0; |
31e77af2 PA |
2596 | |
2597 | insert_breakpoints (); | |
30852783 UW |
2598 | } |
2599 | ||
b0f16a3e SM |
2600 | /* If STEP is set, it's a request to use hardware stepping |
2601 | facilities. But in that case, we should never | |
2602 | use singlestep breakpoint. */ | |
34b7e8a6 | 2603 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2604 | |
fbea99ea | 2605 | /* Decide the set of threads to ask the target to resume. */ |
34b7e8a6 | 2606 | if ((step || thread_has_single_step_breakpoints_set (tp)) |
b0f16a3e SM |
2607 | && tp->control.trap_expected) |
2608 | { | |
2609 | /* We're allowing a thread to run past a breakpoint it has | |
2610 | hit, by single-stepping the thread with the breakpoint | |
2611 | removed. In which case, we need to single-step only this | |
2612 | thread, and keep others stopped, as they can miss this | |
2613 | breakpoint if allowed to run. */ | |
2614 | resume_ptid = inferior_ptid; | |
2615 | } | |
fbea99ea PA |
2616 | else |
2617 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2618 | |
7f5ef605 PA |
2619 | if (execution_direction != EXEC_REVERSE |
2620 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2621 | { |
372316f1 PA |
2622 | /* There are two cases where we currently need to step a |
2623 | breakpoint instruction when we have a signal to deliver: | |
2624 | ||
2625 | - See handle_signal_stop where we handle random signals that | |
2626 | could take out us out of the stepping range. Normally, in | |
2627 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2628 | signal handler with a breakpoint at PC, but there are cases |
2629 | where we should _always_ single-step, even if we have a | |
2630 | step-resume breakpoint, like when a software watchpoint is | |
2631 | set. Assuming single-stepping and delivering a signal at the | |
2632 | same time would takes us to the signal handler, then we could | |
2633 | have removed the breakpoint at PC to step over it. However, | |
2634 | some hardware step targets (like e.g., Mac OS) can't step | |
2635 | into signal handlers, and for those, we need to leave the | |
2636 | breakpoint at PC inserted, as otherwise if the handler | |
2637 | recurses and executes PC again, it'll miss the breakpoint. | |
2638 | So we leave the breakpoint inserted anyway, but we need to | |
2639 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2640 | that adjust_pc_after_break doesn't end up confused. |
2641 | ||
2642 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2643 | in one thread after another thread that was stepping had been | |
2644 | momentarily paused for a step-over. When we re-resume the | |
2645 | stepping thread, it may be resumed from that address with a | |
2646 | breakpoint that hasn't trapped yet. Seen with | |
2647 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2648 | do displaced stepping. */ | |
2649 | ||
2650 | if (debug_infrun) | |
2651 | fprintf_unfiltered (gdb_stdlog, | |
2652 | "infrun: resume: [%s] stepped breakpoint\n", | |
2653 | target_pid_to_str (tp->ptid)); | |
7f5ef605 PA |
2654 | |
2655 | tp->stepped_breakpoint = 1; | |
2656 | ||
b0f16a3e SM |
2657 | /* Most targets can step a breakpoint instruction, thus |
2658 | executing it normally. But if this one cannot, just | |
2659 | continue and we will hit it anyway. */ | |
7f5ef605 | 2660 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2661 | step = 0; |
2662 | } | |
ef5cf84e | 2663 | |
b0f16a3e | 2664 | if (debug_displaced |
cb71640d | 2665 | && tp->control.trap_expected |
3fc8eb30 | 2666 | && use_displaced_stepping (tp) |
cb71640d | 2667 | && !step_over_info_valid_p ()) |
b0f16a3e | 2668 | { |
d9b67d9f | 2669 | struct regcache *resume_regcache = get_thread_regcache (tp->ptid); |
b0f16a3e SM |
2670 | struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache); |
2671 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); | |
2672 | gdb_byte buf[4]; | |
2673 | ||
2674 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2675 | paddress (resume_gdbarch, actual_pc)); | |
2676 | read_memory (actual_pc, buf, sizeof (buf)); | |
2677 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2678 | } | |
237fc4c9 | 2679 | |
b0f16a3e SM |
2680 | if (tp->control.may_range_step) |
2681 | { | |
2682 | /* If we're resuming a thread with the PC out of the step | |
2683 | range, then we're doing some nested/finer run control | |
2684 | operation, like stepping the thread out of the dynamic | |
2685 | linker or the displaced stepping scratch pad. We | |
2686 | shouldn't have allowed a range step then. */ | |
2687 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2688 | } | |
c1e36e3e | 2689 | |
64ce06e4 | 2690 | do_target_resume (resume_ptid, step, sig); |
372316f1 | 2691 | tp->resumed = 1; |
c906108c SS |
2692 | discard_cleanups (old_cleanups); |
2693 | } | |
2694 | \f | |
237fc4c9 | 2695 | /* Proceeding. */ |
c906108c SS |
2696 | |
2697 | /* Clear out all variables saying what to do when inferior is continued. | |
2698 | First do this, then set the ones you want, then call `proceed'. */ | |
2699 | ||
a7212384 UW |
2700 | static void |
2701 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2702 | { |
a7212384 UW |
2703 | if (debug_infrun) |
2704 | fprintf_unfiltered (gdb_stdlog, | |
2705 | "infrun: clear_proceed_status_thread (%s)\n", | |
2706 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 2707 | |
372316f1 PA |
2708 | /* If we're starting a new sequence, then the previous finished |
2709 | single-step is no longer relevant. */ | |
2710 | if (tp->suspend.waitstatus_pending_p) | |
2711 | { | |
2712 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2713 | { | |
2714 | if (debug_infrun) | |
2715 | fprintf_unfiltered (gdb_stdlog, | |
2716 | "infrun: clear_proceed_status: pending " | |
2717 | "event of %s was a finished step. " | |
2718 | "Discarding.\n", | |
2719 | target_pid_to_str (tp->ptid)); | |
2720 | ||
2721 | tp->suspend.waitstatus_pending_p = 0; | |
2722 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2723 | } | |
2724 | else if (debug_infrun) | |
2725 | { | |
2726 | char *statstr; | |
2727 | ||
2728 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
2729 | fprintf_unfiltered (gdb_stdlog, | |
2730 | "infrun: clear_proceed_status_thread: thread %s " | |
2731 | "has pending wait status %s " | |
2732 | "(currently_stepping=%d).\n", | |
2733 | target_pid_to_str (tp->ptid), statstr, | |
2734 | currently_stepping (tp)); | |
2735 | xfree (statstr); | |
2736 | } | |
2737 | } | |
2738 | ||
70509625 PA |
2739 | /* If this signal should not be seen by program, give it zero. |
2740 | Used for debugging signals. */ | |
2741 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2742 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2743 | ||
16c381f0 JK |
2744 | tp->control.trap_expected = 0; |
2745 | tp->control.step_range_start = 0; | |
2746 | tp->control.step_range_end = 0; | |
c1e36e3e | 2747 | tp->control.may_range_step = 0; |
16c381f0 JK |
2748 | tp->control.step_frame_id = null_frame_id; |
2749 | tp->control.step_stack_frame_id = null_frame_id; | |
2750 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2751 | tp->control.step_start_function = NULL; |
a7212384 | 2752 | tp->stop_requested = 0; |
4e1c45ea | 2753 | |
16c381f0 | 2754 | tp->control.stop_step = 0; |
32400beb | 2755 | |
16c381f0 | 2756 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2757 | |
17b2616c | 2758 | tp->control.command_interp = NULL; |
856e7dd6 | 2759 | tp->control.stepping_command = 0; |
17b2616c | 2760 | |
a7212384 | 2761 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2762 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2763 | } |
32400beb | 2764 | |
a7212384 | 2765 | void |
70509625 | 2766 | clear_proceed_status (int step) |
a7212384 | 2767 | { |
6c95b8df PA |
2768 | if (!non_stop) |
2769 | { | |
70509625 PA |
2770 | struct thread_info *tp; |
2771 | ptid_t resume_ptid; | |
2772 | ||
2773 | resume_ptid = user_visible_resume_ptid (step); | |
2774 | ||
2775 | /* In all-stop mode, delete the per-thread status of all threads | |
2776 | we're about to resume, implicitly and explicitly. */ | |
2777 | ALL_NON_EXITED_THREADS (tp) | |
2778 | { | |
2779 | if (!ptid_match (tp->ptid, resume_ptid)) | |
2780 | continue; | |
2781 | clear_proceed_status_thread (tp); | |
2782 | } | |
6c95b8df PA |
2783 | } |
2784 | ||
a7212384 UW |
2785 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2786 | { | |
2787 | struct inferior *inferior; | |
2788 | ||
2789 | if (non_stop) | |
2790 | { | |
6c95b8df PA |
2791 | /* If in non-stop mode, only delete the per-thread status of |
2792 | the current thread. */ | |
a7212384 UW |
2793 | clear_proceed_status_thread (inferior_thread ()); |
2794 | } | |
6c95b8df | 2795 | |
d6b48e9c | 2796 | inferior = current_inferior (); |
16c381f0 | 2797 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2798 | } |
2799 | ||
c906108c | 2800 | stop_after_trap = 0; |
f3b1572e PA |
2801 | |
2802 | observer_notify_about_to_proceed (); | |
c906108c SS |
2803 | } |
2804 | ||
99619bea PA |
2805 | /* Returns true if TP is still stopped at a breakpoint that needs |
2806 | stepping-over in order to make progress. If the breakpoint is gone | |
2807 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2808 | |
2809 | static int | |
6c4cfb24 | 2810 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2811 | { |
2812 | if (tp->stepping_over_breakpoint) | |
2813 | { | |
2814 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
2815 | ||
2816 | if (breakpoint_here_p (get_regcache_aspace (regcache), | |
af48d08f PA |
2817 | regcache_read_pc (regcache)) |
2818 | == ordinary_breakpoint_here) | |
99619bea PA |
2819 | return 1; |
2820 | ||
2821 | tp->stepping_over_breakpoint = 0; | |
2822 | } | |
2823 | ||
2824 | return 0; | |
2825 | } | |
2826 | ||
6c4cfb24 PA |
2827 | /* Check whether thread TP still needs to start a step-over in order |
2828 | to make progress when resumed. Returns an bitwise or of enum | |
2829 | step_over_what bits, indicating what needs to be stepped over. */ | |
2830 | ||
2831 | static int | |
2832 | thread_still_needs_step_over (struct thread_info *tp) | |
2833 | { | |
2834 | struct inferior *inf = find_inferior_ptid (tp->ptid); | |
2835 | int what = 0; | |
2836 | ||
2837 | if (thread_still_needs_step_over_bp (tp)) | |
2838 | what |= STEP_OVER_BREAKPOINT; | |
2839 | ||
2840 | if (tp->stepping_over_watchpoint | |
2841 | && !target_have_steppable_watchpoint) | |
2842 | what |= STEP_OVER_WATCHPOINT; | |
2843 | ||
2844 | return what; | |
2845 | } | |
2846 | ||
483805cf PA |
2847 | /* Returns true if scheduler locking applies. STEP indicates whether |
2848 | we're about to do a step/next-like command to a thread. */ | |
2849 | ||
2850 | static int | |
856e7dd6 | 2851 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2852 | { |
2853 | return (scheduler_mode == schedlock_on | |
2854 | || (scheduler_mode == schedlock_step | |
856e7dd6 | 2855 | && tp->control.stepping_command)); |
483805cf PA |
2856 | } |
2857 | ||
c906108c SS |
2858 | /* Basic routine for continuing the program in various fashions. |
2859 | ||
2860 | ADDR is the address to resume at, or -1 for resume where stopped. | |
2861 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 2862 | or -1 for act according to how it stopped. |
c906108c | 2863 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
2864 | -1 means return after that and print nothing. |
2865 | You should probably set various step_... variables | |
2866 | before calling here, if you are stepping. | |
c906108c SS |
2867 | |
2868 | You should call clear_proceed_status before calling proceed. */ | |
2869 | ||
2870 | void | |
64ce06e4 | 2871 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2872 | { |
e58b0e63 PA |
2873 | struct regcache *regcache; |
2874 | struct gdbarch *gdbarch; | |
4e1c45ea | 2875 | struct thread_info *tp; |
e58b0e63 | 2876 | CORE_ADDR pc; |
6c95b8df | 2877 | struct address_space *aspace; |
4d9d9d04 PA |
2878 | ptid_t resume_ptid; |
2879 | struct execution_control_state ecss; | |
2880 | struct execution_control_state *ecs = &ecss; | |
2881 | struct cleanup *old_chain; | |
2882 | int started; | |
c906108c | 2883 | |
e58b0e63 PA |
2884 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2885 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2886 | resuming the current thread. */ | |
2887 | if (!follow_fork ()) | |
2888 | { | |
2889 | /* The target for some reason decided not to resume. */ | |
2890 | normal_stop (); | |
f148b27e PA |
2891 | if (target_can_async_p ()) |
2892 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2893 | return; |
2894 | } | |
2895 | ||
842951eb PA |
2896 | /* We'll update this if & when we switch to a new thread. */ |
2897 | previous_inferior_ptid = inferior_ptid; | |
2898 | ||
e58b0e63 PA |
2899 | regcache = get_current_regcache (); |
2900 | gdbarch = get_regcache_arch (regcache); | |
6c95b8df | 2901 | aspace = get_regcache_aspace (regcache); |
e58b0e63 | 2902 | pc = regcache_read_pc (regcache); |
2adfaa28 | 2903 | tp = inferior_thread (); |
e58b0e63 | 2904 | |
99619bea PA |
2905 | /* Fill in with reasonable starting values. */ |
2906 | init_thread_stepping_state (tp); | |
2907 | ||
c2829269 PA |
2908 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2909 | ||
2acceee2 | 2910 | if (addr == (CORE_ADDR) -1) |
c906108c | 2911 | { |
af48d08f PA |
2912 | if (pc == stop_pc |
2913 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here | |
b2175913 | 2914 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2915 | /* There is a breakpoint at the address we will resume at, |
2916 | step one instruction before inserting breakpoints so that | |
2917 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2918 | breakpoint). |
2919 | ||
2920 | Note, we don't do this in reverse, because we won't | |
2921 | actually be executing the breakpoint insn anyway. | |
2922 | We'll be (un-)executing the previous instruction. */ | |
99619bea | 2923 | tp->stepping_over_breakpoint = 1; |
515630c5 UW |
2924 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2925 | && gdbarch_single_step_through_delay (gdbarch, | |
2926 | get_current_frame ())) | |
3352ef37 AC |
2927 | /* We stepped onto an instruction that needs to be stepped |
2928 | again before re-inserting the breakpoint, do so. */ | |
99619bea | 2929 | tp->stepping_over_breakpoint = 1; |
c906108c SS |
2930 | } |
2931 | else | |
2932 | { | |
515630c5 | 2933 | regcache_write_pc (regcache, addr); |
c906108c SS |
2934 | } |
2935 | ||
70509625 PA |
2936 | if (siggnal != GDB_SIGNAL_DEFAULT) |
2937 | tp->suspend.stop_signal = siggnal; | |
2938 | ||
17b2616c PA |
2939 | /* Record the interpreter that issued the execution command that |
2940 | caused this thread to resume. If the top level interpreter is | |
2941 | MI/async, and the execution command was a CLI command | |
2942 | (next/step/etc.), we'll want to print stop event output to the MI | |
2943 | console channel (the stepped-to line, etc.), as if the user | |
2944 | entered the execution command on a real GDB console. */ | |
4d9d9d04 PA |
2945 | tp->control.command_interp = command_interp (); |
2946 | ||
2947 | resume_ptid = user_visible_resume_ptid (tp->control.stepping_command); | |
2948 | ||
2949 | /* If an exception is thrown from this point on, make sure to | |
2950 | propagate GDB's knowledge of the executing state to the | |
2951 | frontend/user running state. */ | |
2952 | old_chain = make_cleanup (finish_thread_state_cleanup, &resume_ptid); | |
2953 | ||
2954 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
2955 | threads (e.g., we might need to set threads stepping over | |
2956 | breakpoints first), from the user/frontend's point of view, all | |
2957 | threads in RESUME_PTID are now running. Unless we're calling an | |
2958 | inferior function, as in that case we pretend the inferior | |
2959 | doesn't run at all. */ | |
2960 | if (!tp->control.in_infcall) | |
2961 | set_running (resume_ptid, 1); | |
17b2616c | 2962 | |
527159b7 | 2963 | if (debug_infrun) |
8a9de0e4 | 2964 | fprintf_unfiltered (gdb_stdlog, |
64ce06e4 | 2965 | "infrun: proceed (addr=%s, signal=%s)\n", |
c9737c08 | 2966 | paddress (gdbarch, addr), |
64ce06e4 | 2967 | gdb_signal_to_symbol_string (siggnal)); |
527159b7 | 2968 | |
4d9d9d04 PA |
2969 | annotate_starting (); |
2970 | ||
2971 | /* Make sure that output from GDB appears before output from the | |
2972 | inferior. */ | |
2973 | gdb_flush (gdb_stdout); | |
2974 | ||
2975 | /* In a multi-threaded task we may select another thread and | |
2976 | then continue or step. | |
2977 | ||
2978 | But if a thread that we're resuming had stopped at a breakpoint, | |
2979 | it will immediately cause another breakpoint stop without any | |
2980 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
2981 | we must step over it first. | |
2982 | ||
2983 | Look for threads other than the current (TP) that reported a | |
2984 | breakpoint hit and haven't been resumed yet since. */ | |
2985 | ||
2986 | /* If scheduler locking applies, we can avoid iterating over all | |
2987 | threads. */ | |
2988 | if (!non_stop && !schedlock_applies (tp)) | |
94cc34af | 2989 | { |
4d9d9d04 PA |
2990 | struct thread_info *current = tp; |
2991 | ||
2992 | ALL_NON_EXITED_THREADS (tp) | |
2993 | { | |
2994 | /* Ignore the current thread here. It's handled | |
2995 | afterwards. */ | |
2996 | if (tp == current) | |
2997 | continue; | |
99619bea | 2998 | |
4d9d9d04 PA |
2999 | /* Ignore threads of processes we're not resuming. */ |
3000 | if (!ptid_match (tp->ptid, resume_ptid)) | |
3001 | continue; | |
c906108c | 3002 | |
4d9d9d04 PA |
3003 | if (!thread_still_needs_step_over (tp)) |
3004 | continue; | |
3005 | ||
3006 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3007 | |
99619bea PA |
3008 | if (debug_infrun) |
3009 | fprintf_unfiltered (gdb_stdlog, | |
3010 | "infrun: need to step-over [%s] first\n", | |
4d9d9d04 | 3011 | target_pid_to_str (tp->ptid)); |
99619bea | 3012 | |
4d9d9d04 | 3013 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3014 | } |
31e77af2 | 3015 | |
4d9d9d04 | 3016 | tp = current; |
30852783 UW |
3017 | } |
3018 | ||
4d9d9d04 PA |
3019 | /* Enqueue the current thread last, so that we move all other |
3020 | threads over their breakpoints first. */ | |
3021 | if (tp->stepping_over_breakpoint) | |
3022 | thread_step_over_chain_enqueue (tp); | |
30852783 | 3023 | |
4d9d9d04 PA |
3024 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3025 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3026 | advanced. Must do this before resuming any thread, as in | |
3027 | all-stop/remote, once we resume we can't send any other packet | |
3028 | until the target stops again. */ | |
3029 | tp->prev_pc = regcache_read_pc (regcache); | |
99619bea | 3030 | |
4d9d9d04 | 3031 | started = start_step_over (); |
c906108c | 3032 | |
4d9d9d04 PA |
3033 | if (step_over_info_valid_p ()) |
3034 | { | |
3035 | /* Either this thread started a new in-line step over, or some | |
3036 | other thread was already doing one. In either case, don't | |
3037 | resume anything else until the step-over is finished. */ | |
3038 | } | |
fbea99ea | 3039 | else if (started && !target_is_non_stop_p ()) |
4d9d9d04 PA |
3040 | { |
3041 | /* A new displaced stepping sequence was started. In all-stop, | |
3042 | we can't talk to the target anymore until it next stops. */ | |
3043 | } | |
fbea99ea PA |
3044 | else if (!non_stop && target_is_non_stop_p ()) |
3045 | { | |
3046 | /* In all-stop, but the target is always in non-stop mode. | |
3047 | Start all other threads that are implicitly resumed too. */ | |
3048 | ALL_NON_EXITED_THREADS (tp) | |
3049 | { | |
3050 | /* Ignore threads of processes we're not resuming. */ | |
3051 | if (!ptid_match (tp->ptid, resume_ptid)) | |
3052 | continue; | |
3053 | ||
3054 | if (tp->resumed) | |
3055 | { | |
3056 | if (debug_infrun) | |
3057 | fprintf_unfiltered (gdb_stdlog, | |
3058 | "infrun: proceed: [%s] resumed\n", | |
3059 | target_pid_to_str (tp->ptid)); | |
3060 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
3061 | continue; | |
3062 | } | |
3063 | ||
3064 | if (thread_is_in_step_over_chain (tp)) | |
3065 | { | |
3066 | if (debug_infrun) | |
3067 | fprintf_unfiltered (gdb_stdlog, | |
3068 | "infrun: proceed: [%s] needs step-over\n", | |
3069 | target_pid_to_str (tp->ptid)); | |
3070 | continue; | |
3071 | } | |
3072 | ||
3073 | if (debug_infrun) | |
3074 | fprintf_unfiltered (gdb_stdlog, | |
3075 | "infrun: proceed: resuming %s\n", | |
3076 | target_pid_to_str (tp->ptid)); | |
3077 | ||
3078 | reset_ecs (ecs, tp); | |
3079 | switch_to_thread (tp->ptid); | |
3080 | keep_going_pass_signal (ecs); | |
3081 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3082 | error (_("Command aborted.")); |
fbea99ea PA |
3083 | } |
3084 | } | |
372316f1 | 3085 | else if (!tp->resumed && !thread_is_in_step_over_chain (tp)) |
4d9d9d04 PA |
3086 | { |
3087 | /* The thread wasn't started, and isn't queued, run it now. */ | |
3088 | reset_ecs (ecs, tp); | |
3089 | switch_to_thread (tp->ptid); | |
3090 | keep_going_pass_signal (ecs); | |
3091 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3092 | error (_("Command aborted.")); |
4d9d9d04 | 3093 | } |
c906108c | 3094 | |
4d9d9d04 | 3095 | discard_cleanups (old_chain); |
c906108c SS |
3096 | |
3097 | /* Wait for it to stop (if not standalone) | |
3098 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 | 3099 | /* Do this only if we are not using the event loop, or if the target |
1777feb0 | 3100 | does not support asynchronous execution. */ |
362646f5 | 3101 | if (!target_can_async_p ()) |
43ff13b4 | 3102 | { |
e4c8541f | 3103 | wait_for_inferior (); |
43ff13b4 JM |
3104 | normal_stop (); |
3105 | } | |
c906108c | 3106 | } |
c906108c SS |
3107 | \f |
3108 | ||
3109 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3110 | |
c906108c | 3111 | void |
8621d6a9 | 3112 | start_remote (int from_tty) |
c906108c | 3113 | { |
d6b48e9c | 3114 | struct inferior *inferior; |
d6b48e9c PA |
3115 | |
3116 | inferior = current_inferior (); | |
16c381f0 | 3117 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; |
43ff13b4 | 3118 | |
1777feb0 | 3119 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3120 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3121 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3122 | nothing is returned (instead of just blocking). Because of this, |
3123 | targets expecting an immediate response need to, internally, set | |
3124 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3125 | timeout. */ |
6426a772 JM |
3126 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3127 | differentiate to its caller what the state of the target is after | |
3128 | the initial open has been performed. Here we're assuming that | |
3129 | the target has stopped. It should be possible to eventually have | |
3130 | target_open() return to the caller an indication that the target | |
3131 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3132 | for an async run. */ |
e4c8541f | 3133 | wait_for_inferior (); |
8621d6a9 DJ |
3134 | |
3135 | /* Now that the inferior has stopped, do any bookkeeping like | |
3136 | loading shared libraries. We want to do this before normal_stop, | |
3137 | so that the displayed frame is up to date. */ | |
3138 | post_create_inferior (¤t_target, from_tty); | |
3139 | ||
6426a772 | 3140 | normal_stop (); |
c906108c SS |
3141 | } |
3142 | ||
3143 | /* Initialize static vars when a new inferior begins. */ | |
3144 | ||
3145 | void | |
96baa820 | 3146 | init_wait_for_inferior (void) |
c906108c SS |
3147 | { |
3148 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3149 | |
c906108c SS |
3150 | breakpoint_init_inferior (inf_starting); |
3151 | ||
70509625 | 3152 | clear_proceed_status (0); |
9f976b41 | 3153 | |
ca005067 | 3154 | target_last_wait_ptid = minus_one_ptid; |
237fc4c9 | 3155 | |
842951eb | 3156 | previous_inferior_ptid = inferior_ptid; |
0d1e5fa7 | 3157 | |
edb3359d DJ |
3158 | /* Discard any skipped inlined frames. */ |
3159 | clear_inline_frame_state (minus_one_ptid); | |
c906108c | 3160 | } |
237fc4c9 | 3161 | |
c906108c | 3162 | \f |
488f131b | 3163 | |
ec9499be | 3164 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3165 | |
568d6575 UW |
3166 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3167 | struct execution_control_state *ecs); | |
3168 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3169 | struct execution_control_state *ecs); | |
4f5d7f63 | 3170 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3171 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3172 | struct frame_info *); |
611c83ae | 3173 | |
bdc36728 | 3174 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3175 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3176 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3177 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3178 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3179 | |
252fbfc8 PA |
3180 | /* Callback for iterate over threads. If the thread is stopped, but |
3181 | the user/frontend doesn't know about that yet, go through | |
3182 | normal_stop, as if the thread had just stopped now. ARG points at | |
3183 | a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If | |
3184 | ptid_is_pid(PTID) is true, applies to all threads of the process | |
3185 | pointed at by PTID. Otherwise, apply only to the thread pointed by | |
3186 | PTID. */ | |
3187 | ||
3188 | static int | |
3189 | infrun_thread_stop_requested_callback (struct thread_info *info, void *arg) | |
3190 | { | |
3191 | ptid_t ptid = * (ptid_t *) arg; | |
3192 | ||
3193 | if ((ptid_equal (info->ptid, ptid) | |
3194 | || ptid_equal (minus_one_ptid, ptid) | |
3195 | || (ptid_is_pid (ptid) | |
3196 | && ptid_get_pid (ptid) == ptid_get_pid (info->ptid))) | |
3197 | && is_running (info->ptid) | |
3198 | && !is_executing (info->ptid)) | |
3199 | { | |
3200 | struct cleanup *old_chain; | |
3201 | struct execution_control_state ecss; | |
3202 | struct execution_control_state *ecs = &ecss; | |
3203 | ||
3204 | memset (ecs, 0, sizeof (*ecs)); | |
3205 | ||
3206 | old_chain = make_cleanup_restore_current_thread (); | |
3207 | ||
f15cb84a YQ |
3208 | overlay_cache_invalid = 1; |
3209 | /* Flush target cache before starting to handle each event. | |
3210 | Target was running and cache could be stale. This is just a | |
3211 | heuristic. Running threads may modify target memory, but we | |
3212 | don't get any event. */ | |
3213 | target_dcache_invalidate (); | |
3214 | ||
252fbfc8 PA |
3215 | /* Go through handle_inferior_event/normal_stop, so we always |
3216 | have consistent output as if the stop event had been | |
3217 | reported. */ | |
3218 | ecs->ptid = info->ptid; | |
e09875d4 | 3219 | ecs->event_thread = find_thread_ptid (info->ptid); |
252fbfc8 | 3220 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; |
a493e3e2 | 3221 | ecs->ws.value.sig = GDB_SIGNAL_0; |
252fbfc8 PA |
3222 | |
3223 | handle_inferior_event (ecs); | |
3224 | ||
3225 | if (!ecs->wait_some_more) | |
3226 | { | |
3227 | struct thread_info *tp; | |
3228 | ||
3229 | normal_stop (); | |
3230 | ||
fa4cd53f | 3231 | /* Finish off the continuations. */ |
252fbfc8 | 3232 | tp = inferior_thread (); |
fa4cd53f PA |
3233 | do_all_intermediate_continuations_thread (tp, 1); |
3234 | do_all_continuations_thread (tp, 1); | |
252fbfc8 PA |
3235 | } |
3236 | ||
3237 | do_cleanups (old_chain); | |
3238 | } | |
3239 | ||
3240 | return 0; | |
3241 | } | |
3242 | ||
3243 | /* This function is attached as a "thread_stop_requested" observer. | |
3244 | Cleanup local state that assumed the PTID was to be resumed, and | |
3245 | report the stop to the frontend. */ | |
3246 | ||
2c0b251b | 3247 | static void |
252fbfc8 PA |
3248 | infrun_thread_stop_requested (ptid_t ptid) |
3249 | { | |
c2829269 | 3250 | struct thread_info *tp; |
252fbfc8 | 3251 | |
c2829269 PA |
3252 | /* PTID was requested to stop. Remove matching threads from the |
3253 | step-over queue, so we don't try to resume them | |
3254 | automatically. */ | |
3255 | ALL_NON_EXITED_THREADS (tp) | |
3256 | if (ptid_match (tp->ptid, ptid)) | |
3257 | { | |
3258 | if (thread_is_in_step_over_chain (tp)) | |
3259 | thread_step_over_chain_remove (tp); | |
3260 | } | |
252fbfc8 PA |
3261 | |
3262 | iterate_over_threads (infrun_thread_stop_requested_callback, &ptid); | |
3263 | } | |
3264 | ||
a07daef3 PA |
3265 | static void |
3266 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3267 | { | |
3268 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
3269 | nullify_last_target_wait_ptid (); | |
3270 | } | |
3271 | ||
0cbcdb96 PA |
3272 | /* Delete the step resume, single-step and longjmp/exception resume |
3273 | breakpoints of TP. */ | |
4e1c45ea | 3274 | |
0cbcdb96 PA |
3275 | static void |
3276 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3277 | { |
0cbcdb96 PA |
3278 | delete_step_resume_breakpoint (tp); |
3279 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3280 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3281 | } |
3282 | ||
0cbcdb96 PA |
3283 | /* If the target still has execution, call FUNC for each thread that |
3284 | just stopped. In all-stop, that's all the non-exited threads; in | |
3285 | non-stop, that's the current thread, only. */ | |
3286 | ||
3287 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3288 | (struct thread_info *tp); | |
4e1c45ea PA |
3289 | |
3290 | static void | |
0cbcdb96 | 3291 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3292 | { |
0cbcdb96 | 3293 | if (!target_has_execution || ptid_equal (inferior_ptid, null_ptid)) |
4e1c45ea PA |
3294 | return; |
3295 | ||
fbea99ea | 3296 | if (target_is_non_stop_p ()) |
4e1c45ea | 3297 | { |
0cbcdb96 PA |
3298 | /* If in non-stop mode, only the current thread stopped. */ |
3299 | func (inferior_thread ()); | |
4e1c45ea PA |
3300 | } |
3301 | else | |
0cbcdb96 PA |
3302 | { |
3303 | struct thread_info *tp; | |
3304 | ||
3305 | /* In all-stop mode, all threads have stopped. */ | |
3306 | ALL_NON_EXITED_THREADS (tp) | |
3307 | { | |
3308 | func (tp); | |
3309 | } | |
3310 | } | |
3311 | } | |
3312 | ||
3313 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3314 | the threads that just stopped. */ | |
3315 | ||
3316 | static void | |
3317 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3318 | { | |
3319 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3320 | } |
3321 | ||
3322 | /* Delete the single-step breakpoints of the threads that just | |
3323 | stopped. */ | |
7c16b83e | 3324 | |
34b7e8a6 PA |
3325 | static void |
3326 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3327 | { | |
3328 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3329 | } |
3330 | ||
1777feb0 | 3331 | /* A cleanup wrapper. */ |
4e1c45ea PA |
3332 | |
3333 | static void | |
0cbcdb96 | 3334 | delete_just_stopped_threads_infrun_breakpoints_cleanup (void *arg) |
4e1c45ea | 3335 | { |
0cbcdb96 | 3336 | delete_just_stopped_threads_infrun_breakpoints (); |
4e1c45ea PA |
3337 | } |
3338 | ||
221e1a37 | 3339 | /* See infrun.h. */ |
223698f8 | 3340 | |
221e1a37 | 3341 | void |
223698f8 DE |
3342 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3343 | const struct target_waitstatus *ws) | |
3344 | { | |
3345 | char *status_string = target_waitstatus_to_string (ws); | |
3346 | struct ui_file *tmp_stream = mem_fileopen (); | |
3347 | char *text; | |
223698f8 DE |
3348 | |
3349 | /* The text is split over several lines because it was getting too long. | |
3350 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3351 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3352 | is set. */ | |
3353 | ||
3354 | fprintf_unfiltered (tmp_stream, | |
1176ecec PA |
3355 | "infrun: target_wait (%d.%ld.%ld", |
3356 | ptid_get_pid (waiton_ptid), | |
3357 | ptid_get_lwp (waiton_ptid), | |
3358 | ptid_get_tid (waiton_ptid)); | |
dfd4cc63 | 3359 | if (ptid_get_pid (waiton_ptid) != -1) |
223698f8 DE |
3360 | fprintf_unfiltered (tmp_stream, |
3361 | " [%s]", target_pid_to_str (waiton_ptid)); | |
3362 | fprintf_unfiltered (tmp_stream, ", status) =\n"); | |
3363 | fprintf_unfiltered (tmp_stream, | |
1176ecec | 3364 | "infrun: %d.%ld.%ld [%s],\n", |
dfd4cc63 | 3365 | ptid_get_pid (result_ptid), |
1176ecec PA |
3366 | ptid_get_lwp (result_ptid), |
3367 | ptid_get_tid (result_ptid), | |
dfd4cc63 | 3368 | target_pid_to_str (result_ptid)); |
223698f8 DE |
3369 | fprintf_unfiltered (tmp_stream, |
3370 | "infrun: %s\n", | |
3371 | status_string); | |
3372 | ||
759ef836 | 3373 | text = ui_file_xstrdup (tmp_stream, NULL); |
223698f8 DE |
3374 | |
3375 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3376 | a gcc error: the format attribute requires a string literal. */ | |
3377 | fprintf_unfiltered (gdb_stdlog, "%s", text); | |
3378 | ||
3379 | xfree (status_string); | |
3380 | xfree (text); | |
3381 | ui_file_delete (tmp_stream); | |
3382 | } | |
3383 | ||
372316f1 PA |
3384 | /* Select a thread at random, out of those which are resumed and have |
3385 | had events. */ | |
3386 | ||
3387 | static struct thread_info * | |
3388 | random_pending_event_thread (ptid_t waiton_ptid) | |
3389 | { | |
3390 | struct thread_info *event_tp; | |
3391 | int num_events = 0; | |
3392 | int random_selector; | |
3393 | ||
3394 | /* First see how many events we have. Count only resumed threads | |
3395 | that have an event pending. */ | |
3396 | ALL_NON_EXITED_THREADS (event_tp) | |
3397 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3398 | && event_tp->resumed | |
3399 | && event_tp->suspend.waitstatus_pending_p) | |
3400 | num_events++; | |
3401 | ||
3402 | if (num_events == 0) | |
3403 | return NULL; | |
3404 | ||
3405 | /* Now randomly pick a thread out of those that have had events. */ | |
3406 | random_selector = (int) | |
3407 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
3408 | ||
3409 | if (debug_infrun && num_events > 1) | |
3410 | fprintf_unfiltered (gdb_stdlog, | |
3411 | "infrun: Found %d events, selecting #%d\n", | |
3412 | num_events, random_selector); | |
3413 | ||
3414 | /* Select the Nth thread that has had an event. */ | |
3415 | ALL_NON_EXITED_THREADS (event_tp) | |
3416 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3417 | && event_tp->resumed | |
3418 | && event_tp->suspend.waitstatus_pending_p) | |
3419 | if (random_selector-- == 0) | |
3420 | break; | |
3421 | ||
3422 | return event_tp; | |
3423 | } | |
3424 | ||
3425 | /* Wrapper for target_wait that first checks whether threads have | |
3426 | pending statuses to report before actually asking the target for | |
3427 | more events. */ | |
3428 | ||
3429 | static ptid_t | |
3430 | do_target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
3431 | { | |
3432 | ptid_t event_ptid; | |
3433 | struct thread_info *tp; | |
3434 | ||
3435 | /* First check if there is a resumed thread with a wait status | |
3436 | pending. */ | |
3437 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) | |
3438 | { | |
3439 | tp = random_pending_event_thread (ptid); | |
3440 | } | |
3441 | else | |
3442 | { | |
3443 | if (debug_infrun) | |
3444 | fprintf_unfiltered (gdb_stdlog, | |
3445 | "infrun: Waiting for specific thread %s.\n", | |
3446 | target_pid_to_str (ptid)); | |
3447 | ||
3448 | /* We have a specific thread to check. */ | |
3449 | tp = find_thread_ptid (ptid); | |
3450 | gdb_assert (tp != NULL); | |
3451 | if (!tp->suspend.waitstatus_pending_p) | |
3452 | tp = NULL; | |
3453 | } | |
3454 | ||
3455 | if (tp != NULL | |
3456 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3457 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3458 | { | |
3459 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
3460 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3461 | CORE_ADDR pc; | |
3462 | int discard = 0; | |
3463 | ||
3464 | pc = regcache_read_pc (regcache); | |
3465 | ||
3466 | if (pc != tp->suspend.stop_pc) | |
3467 | { | |
3468 | if (debug_infrun) | |
3469 | fprintf_unfiltered (gdb_stdlog, | |
3470 | "infrun: PC of %s changed. was=%s, now=%s\n", | |
3471 | target_pid_to_str (tp->ptid), | |
3472 | paddress (gdbarch, tp->prev_pc), | |
3473 | paddress (gdbarch, pc)); | |
3474 | discard = 1; | |
3475 | } | |
3476 | else if (!breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3477 | { | |
3478 | if (debug_infrun) | |
3479 | fprintf_unfiltered (gdb_stdlog, | |
3480 | "infrun: previous breakpoint of %s, at %s gone\n", | |
3481 | target_pid_to_str (tp->ptid), | |
3482 | paddress (gdbarch, pc)); | |
3483 | ||
3484 | discard = 1; | |
3485 | } | |
3486 | ||
3487 | if (discard) | |
3488 | { | |
3489 | if (debug_infrun) | |
3490 | fprintf_unfiltered (gdb_stdlog, | |
3491 | "infrun: pending event of %s cancelled.\n", | |
3492 | target_pid_to_str (tp->ptid)); | |
3493 | ||
3494 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3495 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3496 | } | |
3497 | } | |
3498 | ||
3499 | if (tp != NULL) | |
3500 | { | |
3501 | if (debug_infrun) | |
3502 | { | |
3503 | char *statstr; | |
3504 | ||
3505 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
3506 | fprintf_unfiltered (gdb_stdlog, | |
3507 | "infrun: Using pending wait status %s for %s.\n", | |
3508 | statstr, | |
3509 | target_pid_to_str (tp->ptid)); | |
3510 | xfree (statstr); | |
3511 | } | |
3512 | ||
3513 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3514 | if it was a software breakpoint (and the target doesn't | |
3515 | always adjust the PC itself). */ | |
3516 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3517 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3518 | { | |
3519 | struct regcache *regcache; | |
3520 | struct gdbarch *gdbarch; | |
3521 | int decr_pc; | |
3522 | ||
3523 | regcache = get_thread_regcache (tp->ptid); | |
3524 | gdbarch = get_regcache_arch (regcache); | |
3525 | ||
3526 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3527 | if (decr_pc != 0) | |
3528 | { | |
3529 | CORE_ADDR pc; | |
3530 | ||
3531 | pc = regcache_read_pc (regcache); | |
3532 | regcache_write_pc (regcache, pc + decr_pc); | |
3533 | } | |
3534 | } | |
3535 | ||
3536 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3537 | *status = tp->suspend.waitstatus; | |
3538 | tp->suspend.waitstatus_pending_p = 0; | |
3539 | ||
3540 | /* Wake up the event loop again, until all pending events are | |
3541 | processed. */ | |
3542 | if (target_is_async_p ()) | |
3543 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3544 | return tp->ptid; | |
3545 | } | |
3546 | ||
3547 | /* But if we don't find one, we'll have to wait. */ | |
3548 | ||
3549 | if (deprecated_target_wait_hook) | |
3550 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3551 | else | |
3552 | event_ptid = target_wait (ptid, status, options); | |
3553 | ||
3554 | return event_ptid; | |
3555 | } | |
3556 | ||
24291992 PA |
3557 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3558 | detaching while a thread is displaced stepping is a recipe for | |
3559 | crashing it, as nothing would readjust the PC out of the scratch | |
3560 | pad. */ | |
3561 | ||
3562 | void | |
3563 | prepare_for_detach (void) | |
3564 | { | |
3565 | struct inferior *inf = current_inferior (); | |
3566 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
3567 | struct cleanup *old_chain_1; | |
3568 | struct displaced_step_inferior_state *displaced; | |
3569 | ||
3570 | displaced = get_displaced_stepping_state (inf->pid); | |
3571 | ||
3572 | /* Is any thread of this process displaced stepping? If not, | |
3573 | there's nothing else to do. */ | |
3574 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
3575 | return; | |
3576 | ||
3577 | if (debug_infrun) | |
3578 | fprintf_unfiltered (gdb_stdlog, | |
3579 | "displaced-stepping in-process while detaching"); | |
3580 | ||
3581 | old_chain_1 = make_cleanup_restore_integer (&inf->detaching); | |
3582 | inf->detaching = 1; | |
3583 | ||
3584 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
3585 | { | |
3586 | struct cleanup *old_chain_2; | |
3587 | struct execution_control_state ecss; | |
3588 | struct execution_control_state *ecs; | |
3589 | ||
3590 | ecs = &ecss; | |
3591 | memset (ecs, 0, sizeof (*ecs)); | |
3592 | ||
3593 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3594 | /* Flush target cache before starting to handle each event. |
3595 | Target was running and cache could be stale. This is just a | |
3596 | heuristic. Running threads may modify target memory, but we | |
3597 | don't get any event. */ | |
3598 | target_dcache_invalidate (); | |
24291992 | 3599 | |
372316f1 | 3600 | ecs->ptid = do_target_wait (pid_ptid, &ecs->ws, 0); |
24291992 PA |
3601 | |
3602 | if (debug_infrun) | |
3603 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3604 | ||
3605 | /* If an error happens while handling the event, propagate GDB's | |
3606 | knowledge of the executing state to the frontend/user running | |
3607 | state. */ | |
3e43a32a MS |
3608 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, |
3609 | &minus_one_ptid); | |
24291992 PA |
3610 | |
3611 | /* Now figure out what to do with the result of the result. */ | |
3612 | handle_inferior_event (ecs); | |
3613 | ||
3614 | /* No error, don't finish the state yet. */ | |
3615 | discard_cleanups (old_chain_2); | |
3616 | ||
3617 | /* Breakpoints and watchpoints are not installed on the target | |
3618 | at this point, and signals are passed directly to the | |
3619 | inferior, so this must mean the process is gone. */ | |
3620 | if (!ecs->wait_some_more) | |
3621 | { | |
3622 | discard_cleanups (old_chain_1); | |
3623 | error (_("Program exited while detaching")); | |
3624 | } | |
3625 | } | |
3626 | ||
3627 | discard_cleanups (old_chain_1); | |
3628 | } | |
3629 | ||
cd0fc7c3 | 3630 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3631 | |
cd0fc7c3 SS |
3632 | If inferior gets a signal, we may decide to start it up again |
3633 | instead of returning. That is why there is a loop in this function. | |
3634 | When this function actually returns it means the inferior | |
3635 | should be left stopped and GDB should read more commands. */ | |
3636 | ||
3637 | void | |
e4c8541f | 3638 | wait_for_inferior (void) |
cd0fc7c3 SS |
3639 | { |
3640 | struct cleanup *old_cleanups; | |
e6f5c25b | 3641 | struct cleanup *thread_state_chain; |
c906108c | 3642 | |
527159b7 | 3643 | if (debug_infrun) |
ae123ec6 | 3644 | fprintf_unfiltered |
e4c8541f | 3645 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3646 | |
0cbcdb96 PA |
3647 | old_cleanups |
3648 | = make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, | |
3649 | NULL); | |
cd0fc7c3 | 3650 | |
e6f5c25b PA |
3651 | /* If an error happens while handling the event, propagate GDB's |
3652 | knowledge of the executing state to the frontend/user running | |
3653 | state. */ | |
3654 | thread_state_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
3655 | ||
c906108c SS |
3656 | while (1) |
3657 | { | |
ae25568b PA |
3658 | struct execution_control_state ecss; |
3659 | struct execution_control_state *ecs = &ecss; | |
963f9c80 | 3660 | ptid_t waiton_ptid = minus_one_ptid; |
29f49a6a | 3661 | |
ae25568b PA |
3662 | memset (ecs, 0, sizeof (*ecs)); |
3663 | ||
ec9499be | 3664 | overlay_cache_invalid = 1; |
ec9499be | 3665 | |
f15cb84a YQ |
3666 | /* Flush target cache before starting to handle each event. |
3667 | Target was running and cache could be stale. This is just a | |
3668 | heuristic. Running threads may modify target memory, but we | |
3669 | don't get any event. */ | |
3670 | target_dcache_invalidate (); | |
3671 | ||
372316f1 | 3672 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 3673 | |
f00150c9 | 3674 | if (debug_infrun) |
223698f8 | 3675 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3676 | |
cd0fc7c3 SS |
3677 | /* Now figure out what to do with the result of the result. */ |
3678 | handle_inferior_event (ecs); | |
c906108c | 3679 | |
cd0fc7c3 SS |
3680 | if (!ecs->wait_some_more) |
3681 | break; | |
3682 | } | |
4e1c45ea | 3683 | |
e6f5c25b PA |
3684 | /* No error, don't finish the state yet. */ |
3685 | discard_cleanups (thread_state_chain); | |
3686 | ||
cd0fc7c3 SS |
3687 | do_cleanups (old_cleanups); |
3688 | } | |
c906108c | 3689 | |
d3d4baed PA |
3690 | /* Cleanup that reinstalls the readline callback handler, if the |
3691 | target is running in the background. If while handling the target | |
3692 | event something triggered a secondary prompt, like e.g., a | |
3693 | pagination prompt, we'll have removed the callback handler (see | |
3694 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3695 | event loop, ready to process further input. Note this has no | |
3696 | effect if the handler hasn't actually been removed, because calling | |
3697 | rl_callback_handler_install resets the line buffer, thus losing | |
3698 | input. */ | |
3699 | ||
3700 | static void | |
3701 | reinstall_readline_callback_handler_cleanup (void *arg) | |
3702 | { | |
6c400b59 PA |
3703 | if (!interpreter_async) |
3704 | { | |
3705 | /* We're not going back to the top level event loop yet. Don't | |
3706 | install the readline callback, as it'd prep the terminal, | |
3707 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3708 | it the next time the prompt is displayed, when we're ready | |
3709 | for input. */ | |
3710 | return; | |
3711 | } | |
3712 | ||
d3d4baed PA |
3713 | if (async_command_editing_p && !sync_execution) |
3714 | gdb_rl_callback_handler_reinstall (); | |
3715 | } | |
3716 | ||
1777feb0 | 3717 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3718 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3719 | descriptor corresponding to the target. It can be called more than |
3720 | once to complete a single execution command. In such cases we need | |
3721 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3722 | that this function is called for a single execution command, then |
3723 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3724 | necessary cleanups. */ |
43ff13b4 JM |
3725 | |
3726 | void | |
fba45db2 | 3727 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3728 | { |
0d1e5fa7 | 3729 | struct execution_control_state ecss; |
a474d7c2 | 3730 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 3731 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 3732 | struct cleanup *ts_old_chain; |
4f8d22e3 | 3733 | int was_sync = sync_execution; |
0f641c01 | 3734 | int cmd_done = 0; |
963f9c80 | 3735 | ptid_t waiton_ptid = minus_one_ptid; |
43ff13b4 | 3736 | |
0d1e5fa7 PA |
3737 | memset (ecs, 0, sizeof (*ecs)); |
3738 | ||
d3d4baed PA |
3739 | /* End up with readline processing input, if necessary. */ |
3740 | make_cleanup (reinstall_readline_callback_handler_cleanup, NULL); | |
3741 | ||
c5187ac6 PA |
3742 | /* We're handling a live event, so make sure we're doing live |
3743 | debugging. If we're looking at traceframes while the target is | |
3744 | running, we're going to need to get back to that mode after | |
3745 | handling the event. */ | |
3746 | if (non_stop) | |
3747 | { | |
3748 | make_cleanup_restore_current_traceframe (); | |
e6e4e701 | 3749 | set_current_traceframe (-1); |
c5187ac6 PA |
3750 | } |
3751 | ||
4f8d22e3 PA |
3752 | if (non_stop) |
3753 | /* In non-stop mode, the user/frontend should not notice a thread | |
3754 | switch due to internal events. Make sure we reverse to the | |
3755 | user selected thread and frame after handling the event and | |
3756 | running any breakpoint commands. */ | |
3757 | make_cleanup_restore_current_thread (); | |
3758 | ||
ec9499be | 3759 | overlay_cache_invalid = 1; |
f15cb84a YQ |
3760 | /* Flush target cache before starting to handle each event. Target |
3761 | was running and cache could be stale. This is just a heuristic. | |
3762 | Running threads may modify target memory, but we don't get any | |
3763 | event. */ | |
3764 | target_dcache_invalidate (); | |
3dd5b83d | 3765 | |
32231432 PA |
3766 | make_cleanup_restore_integer (&execution_direction); |
3767 | execution_direction = target_execution_direction (); | |
3768 | ||
372316f1 | 3769 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 3770 | |
f00150c9 | 3771 | if (debug_infrun) |
223698f8 | 3772 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3773 | |
29f49a6a PA |
3774 | /* If an error happens while handling the event, propagate GDB's |
3775 | knowledge of the executing state to the frontend/user running | |
3776 | state. */ | |
fbea99ea | 3777 | if (!target_is_non_stop_p ()) |
29f49a6a PA |
3778 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); |
3779 | else | |
3780 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
3781 | ||
353d1d73 JK |
3782 | /* Get executed before make_cleanup_restore_current_thread above to apply |
3783 | still for the thread which has thrown the exception. */ | |
3784 | make_bpstat_clear_actions_cleanup (); | |
3785 | ||
7c16b83e PA |
3786 | make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, NULL); |
3787 | ||
43ff13b4 | 3788 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 3789 | handle_inferior_event (ecs); |
43ff13b4 | 3790 | |
a474d7c2 | 3791 | if (!ecs->wait_some_more) |
43ff13b4 | 3792 | { |
c9657e70 | 3793 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
d6b48e9c | 3794 | |
0cbcdb96 | 3795 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3796 | |
d6b48e9c | 3797 | /* We may not find an inferior if this was a process exit. */ |
16c381f0 | 3798 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) |
83c265ab PA |
3799 | normal_stop (); |
3800 | ||
af679fd0 | 3801 | if (target_has_execution |
0e5bf2a8 | 3802 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED |
af679fd0 PA |
3803 | && ecs->ws.kind != TARGET_WAITKIND_EXITED |
3804 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
3805 | && ecs->event_thread->step_multi | |
16c381f0 | 3806 | && ecs->event_thread->control.stop_step) |
c2d11a7d JM |
3807 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); |
3808 | else | |
0f641c01 PA |
3809 | { |
3810 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
3811 | cmd_done = 1; | |
3812 | } | |
43ff13b4 | 3813 | } |
4f8d22e3 | 3814 | |
29f49a6a PA |
3815 | /* No error, don't finish the thread states yet. */ |
3816 | discard_cleanups (ts_old_chain); | |
3817 | ||
4f8d22e3 PA |
3818 | /* Revert thread and frame. */ |
3819 | do_cleanups (old_chain); | |
3820 | ||
3821 | /* If the inferior was in sync execution mode, and now isn't, | |
0f641c01 PA |
3822 | restore the prompt (a synchronous execution command has finished, |
3823 | and we're ready for input). */ | |
b4a14fd0 | 3824 | if (interpreter_async && was_sync && !sync_execution) |
92bcb5f9 | 3825 | observer_notify_sync_execution_done (); |
0f641c01 PA |
3826 | |
3827 | if (cmd_done | |
3828 | && !was_sync | |
3829 | && exec_done_display_p | |
3830 | && (ptid_equal (inferior_ptid, null_ptid) | |
3831 | || !is_running (inferior_ptid))) | |
3832 | printf_unfiltered (_("completed.\n")); | |
43ff13b4 JM |
3833 | } |
3834 | ||
edb3359d DJ |
3835 | /* Record the frame and location we're currently stepping through. */ |
3836 | void | |
3837 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
3838 | { | |
3839 | struct thread_info *tp = inferior_thread (); | |
3840 | ||
16c381f0 JK |
3841 | tp->control.step_frame_id = get_frame_id (frame); |
3842 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
3843 | |
3844 | tp->current_symtab = sal.symtab; | |
3845 | tp->current_line = sal.line; | |
3846 | } | |
3847 | ||
0d1e5fa7 PA |
3848 | /* Clear context switchable stepping state. */ |
3849 | ||
3850 | void | |
4e1c45ea | 3851 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 3852 | { |
7f5ef605 | 3853 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 3854 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 3855 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 3856 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
3857 | } |
3858 | ||
c32c64b7 DE |
3859 | /* Set the cached copy of the last ptid/waitstatus. */ |
3860 | ||
3861 | static void | |
3862 | set_last_target_status (ptid_t ptid, struct target_waitstatus status) | |
3863 | { | |
3864 | target_last_wait_ptid = ptid; | |
3865 | target_last_waitstatus = status; | |
3866 | } | |
3867 | ||
e02bc4cc | 3868 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
3869 | target_wait()/deprecated_target_wait_hook(). The data is actually |
3870 | cached by handle_inferior_event(), which gets called immediately | |
3871 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
3872 | |
3873 | void | |
488f131b | 3874 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 3875 | { |
39f77062 | 3876 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
3877 | *status = target_last_waitstatus; |
3878 | } | |
3879 | ||
ac264b3b MS |
3880 | void |
3881 | nullify_last_target_wait_ptid (void) | |
3882 | { | |
3883 | target_last_wait_ptid = minus_one_ptid; | |
3884 | } | |
3885 | ||
dcf4fbde | 3886 | /* Switch thread contexts. */ |
dd80620e MS |
3887 | |
3888 | static void | |
0d1e5fa7 | 3889 | context_switch (ptid_t ptid) |
dd80620e | 3890 | { |
4b51d87b | 3891 | if (debug_infrun && !ptid_equal (ptid, inferior_ptid)) |
fd48f117 DJ |
3892 | { |
3893 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
3894 | target_pid_to_str (inferior_ptid)); | |
3895 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 3896 | target_pid_to_str (ptid)); |
fd48f117 DJ |
3897 | } |
3898 | ||
0d1e5fa7 | 3899 | switch_to_thread (ptid); |
dd80620e MS |
3900 | } |
3901 | ||
d8dd4d5f PA |
3902 | /* If the target can't tell whether we've hit breakpoints |
3903 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
3904 | check whether that could have been caused by a breakpoint. If so, | |
3905 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
3906 | ||
4fa8626c | 3907 | static void |
d8dd4d5f PA |
3908 | adjust_pc_after_break (struct thread_info *thread, |
3909 | struct target_waitstatus *ws) | |
4fa8626c | 3910 | { |
24a73cce UW |
3911 | struct regcache *regcache; |
3912 | struct gdbarch *gdbarch; | |
6c95b8df | 3913 | struct address_space *aspace; |
118e6252 | 3914 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 3915 | |
4fa8626c DJ |
3916 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
3917 | we aren't, just return. | |
9709f61c DJ |
3918 | |
3919 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
3920 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
3921 | implemented by software breakpoints should be handled through the normal | |
3922 | breakpoint layer. | |
8fb3e588 | 3923 | |
4fa8626c DJ |
3924 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
3925 | different signals (SIGILL or SIGEMT for instance), but it is less | |
3926 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
3927 | gdbarch_decr_pc_after_break. I don't know any specific target that |
3928 | generates these signals at breakpoints (the code has been in GDB since at | |
3929 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 3930 | |
e6cf7916 UW |
3931 | In earlier versions of GDB, a target with |
3932 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
3933 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
3934 | target with both of these set in GDB history, and it seems unlikely to be | |
3935 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 3936 | |
d8dd4d5f | 3937 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
3938 | return; |
3939 | ||
d8dd4d5f | 3940 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
3941 | return; |
3942 | ||
4058b839 PA |
3943 | /* In reverse execution, when a breakpoint is hit, the instruction |
3944 | under it has already been de-executed. The reported PC always | |
3945 | points at the breakpoint address, so adjusting it further would | |
3946 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
3947 | architecture: | |
3948 | ||
3949 | B1 0x08000000 : INSN1 | |
3950 | B2 0x08000001 : INSN2 | |
3951 | 0x08000002 : INSN3 | |
3952 | PC -> 0x08000003 : INSN4 | |
3953 | ||
3954 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
3955 | from that point should hit B2 as below. Reading the PC when the | |
3956 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
3957 | been de-executed already. | |
3958 | ||
3959 | B1 0x08000000 : INSN1 | |
3960 | B2 PC -> 0x08000001 : INSN2 | |
3961 | 0x08000002 : INSN3 | |
3962 | 0x08000003 : INSN4 | |
3963 | ||
3964 | We can't apply the same logic as for forward execution, because | |
3965 | we would wrongly adjust the PC to 0x08000000, since there's a | |
3966 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
3967 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
3968 | behaviour. */ | |
3969 | if (execution_direction == EXEC_REVERSE) | |
3970 | return; | |
3971 | ||
1cf4d951 PA |
3972 | /* If the target can tell whether the thread hit a SW breakpoint, |
3973 | trust it. Targets that can tell also adjust the PC | |
3974 | themselves. */ | |
3975 | if (target_supports_stopped_by_sw_breakpoint ()) | |
3976 | return; | |
3977 | ||
3978 | /* Note that relying on whether a breakpoint is planted in memory to | |
3979 | determine this can fail. E.g,. the breakpoint could have been | |
3980 | removed since. Or the thread could have been told to step an | |
3981 | instruction the size of a breakpoint instruction, and only | |
3982 | _after_ was a breakpoint inserted at its address. */ | |
3983 | ||
24a73cce UW |
3984 | /* If this target does not decrement the PC after breakpoints, then |
3985 | we have nothing to do. */ | |
d8dd4d5f | 3986 | regcache = get_thread_regcache (thread->ptid); |
24a73cce | 3987 | gdbarch = get_regcache_arch (regcache); |
118e6252 | 3988 | |
527a273a | 3989 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 3990 | if (decr_pc == 0) |
24a73cce UW |
3991 | return; |
3992 | ||
6c95b8df PA |
3993 | aspace = get_regcache_aspace (regcache); |
3994 | ||
8aad930b AC |
3995 | /* Find the location where (if we've hit a breakpoint) the |
3996 | breakpoint would be. */ | |
118e6252 | 3997 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 3998 | |
1cf4d951 PA |
3999 | /* If the target can't tell whether a software breakpoint triggered, |
4000 | fallback to figuring it out based on breakpoints we think were | |
4001 | inserted in the target, and on whether the thread was stepped or | |
4002 | continued. */ | |
4003 | ||
1c5cfe86 PA |
4004 | /* Check whether there actually is a software breakpoint inserted at |
4005 | that location. | |
4006 | ||
4007 | If in non-stop mode, a race condition is possible where we've | |
4008 | removed a breakpoint, but stop events for that breakpoint were | |
4009 | already queued and arrive later. To suppress those spurious | |
4010 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4011 | and retire them after a number of stop events are reported. Note |
4012 | this is an heuristic and can thus get confused. The real fix is | |
4013 | to get the "stopped by SW BP and needs adjustment" info out of | |
4014 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4015 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4016 | || (target_is_non_stop_p () |
4017 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4018 | { |
77f9e713 | 4019 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); |
abbb1732 | 4020 | |
8213266a | 4021 | if (record_full_is_used ()) |
77f9e713 | 4022 | record_full_gdb_operation_disable_set (); |
96429cc8 | 4023 | |
1c0fdd0e UW |
4024 | /* When using hardware single-step, a SIGTRAP is reported for both |
4025 | a completed single-step and a software breakpoint. Need to | |
4026 | differentiate between the two, as the latter needs adjusting | |
4027 | but the former does not. | |
4028 | ||
4029 | The SIGTRAP can be due to a completed hardware single-step only if | |
4030 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4031 | - this thread is currently being stepped |
4032 | ||
4033 | If any of these events did not occur, we must have stopped due | |
4034 | to hitting a software breakpoint, and have to back up to the | |
4035 | breakpoint address. | |
4036 | ||
4037 | As a special case, we could have hardware single-stepped a | |
4038 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4039 | we also need to back up to the breakpoint address. */ | |
4040 | ||
d8dd4d5f PA |
4041 | if (thread_has_single_step_breakpoints_set (thread) |
4042 | || !currently_stepping (thread) | |
4043 | || (thread->stepped_breakpoint | |
4044 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4045 | regcache_write_pc (regcache, breakpoint_pc); |
96429cc8 | 4046 | |
77f9e713 | 4047 | do_cleanups (old_cleanups); |
8aad930b | 4048 | } |
4fa8626c DJ |
4049 | } |
4050 | ||
edb3359d DJ |
4051 | static int |
4052 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4053 | { | |
4054 | for (frame = get_prev_frame (frame); | |
4055 | frame != NULL; | |
4056 | frame = get_prev_frame (frame)) | |
4057 | { | |
4058 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4059 | return 1; | |
4060 | if (get_frame_type (frame) != INLINE_FRAME) | |
4061 | break; | |
4062 | } | |
4063 | ||
4064 | return 0; | |
4065 | } | |
4066 | ||
a96d9b2e SDJ |
4067 | /* Auxiliary function that handles syscall entry/return events. |
4068 | It returns 1 if the inferior should keep going (and GDB | |
4069 | should ignore the event), or 0 if the event deserves to be | |
4070 | processed. */ | |
ca2163eb | 4071 | |
a96d9b2e | 4072 | static int |
ca2163eb | 4073 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4074 | { |
ca2163eb | 4075 | struct regcache *regcache; |
ca2163eb PA |
4076 | int syscall_number; |
4077 | ||
4078 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
4079 | context_switch (ecs->ptid); | |
4080 | ||
4081 | regcache = get_thread_regcache (ecs->ptid); | |
f90263c1 | 4082 | syscall_number = ecs->ws.value.syscall_number; |
ca2163eb PA |
4083 | stop_pc = regcache_read_pc (regcache); |
4084 | ||
a96d9b2e SDJ |
4085 | if (catch_syscall_enabled () > 0 |
4086 | && catching_syscall_number (syscall_number) > 0) | |
4087 | { | |
4088 | if (debug_infrun) | |
4089 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
4090 | syscall_number); | |
a96d9b2e | 4091 | |
16c381f0 | 4092 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4093 | = bpstat_stop_status (get_regcache_aspace (regcache), |
09ac7c10 | 4094 | stop_pc, ecs->ptid, &ecs->ws); |
ab04a2af | 4095 | |
ce12b012 | 4096 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4097 | { |
4098 | /* Catchpoint hit. */ | |
ca2163eb PA |
4099 | return 0; |
4100 | } | |
a96d9b2e | 4101 | } |
ca2163eb PA |
4102 | |
4103 | /* If no catchpoint triggered for this, then keep going. */ | |
ca2163eb PA |
4104 | keep_going (ecs); |
4105 | return 1; | |
a96d9b2e SDJ |
4106 | } |
4107 | ||
7e324e48 GB |
4108 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4109 | ||
4110 | static void | |
4111 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4112 | struct execution_control_state *ecs) | |
4113 | { | |
4114 | if (!ecs->stop_func_filled_in) | |
4115 | { | |
4116 | /* Don't care about return value; stop_func_start and stop_func_name | |
4117 | will both be 0 if it doesn't work. */ | |
4118 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
4119 | &ecs->stop_func_start, &ecs->stop_func_end); | |
4120 | ecs->stop_func_start | |
4121 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4122 | ||
591a12a1 UW |
4123 | if (gdbarch_skip_entrypoint_p (gdbarch)) |
4124 | ecs->stop_func_start = gdbarch_skip_entrypoint (gdbarch, | |
4125 | ecs->stop_func_start); | |
4126 | ||
7e324e48 GB |
4127 | ecs->stop_func_filled_in = 1; |
4128 | } | |
4129 | } | |
4130 | ||
4f5d7f63 PA |
4131 | |
4132 | /* Return the STOP_SOON field of the inferior pointed at by PTID. */ | |
4133 | ||
4134 | static enum stop_kind | |
4135 | get_inferior_stop_soon (ptid_t ptid) | |
4136 | { | |
c9657e70 | 4137 | struct inferior *inf = find_inferior_ptid (ptid); |
4f5d7f63 PA |
4138 | |
4139 | gdb_assert (inf != NULL); | |
4140 | return inf->control.stop_soon; | |
4141 | } | |
4142 | ||
372316f1 PA |
4143 | /* Wait for one event. Store the resulting waitstatus in WS, and |
4144 | return the event ptid. */ | |
4145 | ||
4146 | static ptid_t | |
4147 | wait_one (struct target_waitstatus *ws) | |
4148 | { | |
4149 | ptid_t event_ptid; | |
4150 | ptid_t wait_ptid = minus_one_ptid; | |
4151 | ||
4152 | overlay_cache_invalid = 1; | |
4153 | ||
4154 | /* Flush target cache before starting to handle each event. | |
4155 | Target was running and cache could be stale. This is just a | |
4156 | heuristic. Running threads may modify target memory, but we | |
4157 | don't get any event. */ | |
4158 | target_dcache_invalidate (); | |
4159 | ||
4160 | if (deprecated_target_wait_hook) | |
4161 | event_ptid = deprecated_target_wait_hook (wait_ptid, ws, 0); | |
4162 | else | |
4163 | event_ptid = target_wait (wait_ptid, ws, 0); | |
4164 | ||
4165 | if (debug_infrun) | |
4166 | print_target_wait_results (wait_ptid, event_ptid, ws); | |
4167 | ||
4168 | return event_ptid; | |
4169 | } | |
4170 | ||
4171 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID | |
4172 | instead of the current thread. */ | |
4173 | #define THREAD_STOPPED_BY(REASON) \ | |
4174 | static int \ | |
4175 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4176 | { \ | |
4177 | struct cleanup *old_chain; \ | |
4178 | int res; \ | |
4179 | \ | |
4180 | old_chain = save_inferior_ptid (); \ | |
4181 | inferior_ptid = ptid; \ | |
4182 | \ | |
4183 | res = target_stopped_by_ ## REASON (); \ | |
4184 | \ | |
4185 | do_cleanups (old_chain); \ | |
4186 | \ | |
4187 | return res; \ | |
4188 | } | |
4189 | ||
4190 | /* Generate thread_stopped_by_watchpoint. */ | |
4191 | THREAD_STOPPED_BY (watchpoint) | |
4192 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4193 | THREAD_STOPPED_BY (sw_breakpoint) | |
4194 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4195 | THREAD_STOPPED_BY (hw_breakpoint) | |
4196 | ||
4197 | /* Cleanups that switches to the PTID pointed at by PTID_P. */ | |
4198 | ||
4199 | static void | |
4200 | switch_to_thread_cleanup (void *ptid_p) | |
4201 | { | |
4202 | ptid_t ptid = *(ptid_t *) ptid_p; | |
4203 | ||
4204 | switch_to_thread (ptid); | |
4205 | } | |
4206 | ||
4207 | /* Save the thread's event and stop reason to process it later. */ | |
4208 | ||
4209 | static void | |
4210 | save_waitstatus (struct thread_info *tp, struct target_waitstatus *ws) | |
4211 | { | |
4212 | struct regcache *regcache; | |
4213 | struct address_space *aspace; | |
4214 | ||
4215 | if (debug_infrun) | |
4216 | { | |
4217 | char *statstr; | |
4218 | ||
4219 | statstr = target_waitstatus_to_string (ws); | |
4220 | fprintf_unfiltered (gdb_stdlog, | |
4221 | "infrun: saving status %s for %d.%ld.%ld\n", | |
4222 | statstr, | |
4223 | ptid_get_pid (tp->ptid), | |
4224 | ptid_get_lwp (tp->ptid), | |
4225 | ptid_get_tid (tp->ptid)); | |
4226 | xfree (statstr); | |
4227 | } | |
4228 | ||
4229 | /* Record for later. */ | |
4230 | tp->suspend.waitstatus = *ws; | |
4231 | tp->suspend.waitstatus_pending_p = 1; | |
4232 | ||
4233 | regcache = get_thread_regcache (tp->ptid); | |
4234 | aspace = get_regcache_aspace (regcache); | |
4235 | ||
4236 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4237 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4238 | { | |
4239 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4240 | ||
4241 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4242 | ||
4243 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4244 | { | |
4245 | tp->suspend.stop_reason | |
4246 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4247 | } | |
4248 | else if (target_supports_stopped_by_sw_breakpoint () | |
4249 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4250 | { | |
4251 | tp->suspend.stop_reason | |
4252 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4253 | } | |
4254 | else if (target_supports_stopped_by_hw_breakpoint () | |
4255 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4256 | { | |
4257 | tp->suspend.stop_reason | |
4258 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4259 | } | |
4260 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4261 | && hardware_breakpoint_inserted_here_p (aspace, | |
4262 | pc)) | |
4263 | { | |
4264 | tp->suspend.stop_reason | |
4265 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4266 | } | |
4267 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4268 | && software_breakpoint_inserted_here_p (aspace, | |
4269 | pc)) | |
4270 | { | |
4271 | tp->suspend.stop_reason | |
4272 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4273 | } | |
4274 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4275 | && currently_stepping (tp)) | |
4276 | { | |
4277 | tp->suspend.stop_reason | |
4278 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4279 | } | |
4280 | } | |
4281 | } | |
4282 | ||
4283 | /* Stop all threads. */ | |
4284 | ||
4285 | static void | |
4286 | stop_all_threads (void) | |
4287 | { | |
4288 | /* We may need multiple passes to discover all threads. */ | |
4289 | int pass; | |
4290 | int iterations = 0; | |
4291 | ptid_t entry_ptid; | |
4292 | struct cleanup *old_chain; | |
4293 | ||
fbea99ea | 4294 | gdb_assert (target_is_non_stop_p ()); |
372316f1 PA |
4295 | |
4296 | if (debug_infrun) | |
4297 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n"); | |
4298 | ||
4299 | entry_ptid = inferior_ptid; | |
4300 | old_chain = make_cleanup (switch_to_thread_cleanup, &entry_ptid); | |
4301 | ||
4302 | /* Request threads to stop, and then wait for the stops. Because | |
4303 | threads we already know about can spawn more threads while we're | |
4304 | trying to stop them, and we only learn about new threads when we | |
4305 | update the thread list, do this in a loop, and keep iterating | |
4306 | until two passes find no threads that need to be stopped. */ | |
4307 | for (pass = 0; pass < 2; pass++, iterations++) | |
4308 | { | |
4309 | if (debug_infrun) | |
4310 | fprintf_unfiltered (gdb_stdlog, | |
4311 | "infrun: stop_all_threads, pass=%d, " | |
4312 | "iterations=%d\n", pass, iterations); | |
4313 | while (1) | |
4314 | { | |
4315 | ptid_t event_ptid; | |
4316 | struct target_waitstatus ws; | |
4317 | int need_wait = 0; | |
4318 | struct thread_info *t; | |
4319 | ||
4320 | update_thread_list (); | |
4321 | ||
4322 | /* Go through all threads looking for threads that we need | |
4323 | to tell the target to stop. */ | |
4324 | ALL_NON_EXITED_THREADS (t) | |
4325 | { | |
4326 | if (t->executing) | |
4327 | { | |
4328 | /* If already stopping, don't request a stop again. | |
4329 | We just haven't seen the notification yet. */ | |
4330 | if (!t->stop_requested) | |
4331 | { | |
4332 | if (debug_infrun) | |
4333 | fprintf_unfiltered (gdb_stdlog, | |
4334 | "infrun: %s executing, " | |
4335 | "need stop\n", | |
4336 | target_pid_to_str (t->ptid)); | |
4337 | target_stop (t->ptid); | |
4338 | t->stop_requested = 1; | |
4339 | } | |
4340 | else | |
4341 | { | |
4342 | if (debug_infrun) | |
4343 | fprintf_unfiltered (gdb_stdlog, | |
4344 | "infrun: %s executing, " | |
4345 | "already stopping\n", | |
4346 | target_pid_to_str (t->ptid)); | |
4347 | } | |
4348 | ||
4349 | if (t->stop_requested) | |
4350 | need_wait = 1; | |
4351 | } | |
4352 | else | |
4353 | { | |
4354 | if (debug_infrun) | |
4355 | fprintf_unfiltered (gdb_stdlog, | |
4356 | "infrun: %s not executing\n", | |
4357 | target_pid_to_str (t->ptid)); | |
4358 | ||
4359 | /* The thread may be not executing, but still be | |
4360 | resumed with a pending status to process. */ | |
4361 | t->resumed = 0; | |
4362 | } | |
4363 | } | |
4364 | ||
4365 | if (!need_wait) | |
4366 | break; | |
4367 | ||
4368 | /* If we find new threads on the second iteration, restart | |
4369 | over. We want to see two iterations in a row with all | |
4370 | threads stopped. */ | |
4371 | if (pass > 0) | |
4372 | pass = -1; | |
4373 | ||
4374 | event_ptid = wait_one (&ws); | |
4375 | if (ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4376 | { | |
4377 | /* All resumed threads exited. */ | |
4378 | } | |
4379 | else if (ws.kind == TARGET_WAITKIND_EXITED | |
4380 | || ws.kind == TARGET_WAITKIND_SIGNALLED) | |
4381 | { | |
4382 | if (debug_infrun) | |
4383 | { | |
4384 | ptid_t ptid = pid_to_ptid (ws.value.integer); | |
4385 | ||
4386 | fprintf_unfiltered (gdb_stdlog, | |
4387 | "infrun: %s exited while " | |
4388 | "stopping threads\n", | |
4389 | target_pid_to_str (ptid)); | |
4390 | } | |
4391 | } | |
4392 | else | |
4393 | { | |
4394 | t = find_thread_ptid (event_ptid); | |
4395 | if (t == NULL) | |
4396 | t = add_thread (event_ptid); | |
4397 | ||
4398 | t->stop_requested = 0; | |
4399 | t->executing = 0; | |
4400 | t->resumed = 0; | |
4401 | t->control.may_range_step = 0; | |
4402 | ||
4403 | if (ws.kind == TARGET_WAITKIND_STOPPED | |
4404 | && ws.value.sig == GDB_SIGNAL_0) | |
4405 | { | |
4406 | /* We caught the event that we intended to catch, so | |
4407 | there's no event pending. */ | |
4408 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4409 | t->suspend.waitstatus_pending_p = 0; | |
4410 | ||
4411 | if (displaced_step_fixup (t->ptid, GDB_SIGNAL_0) < 0) | |
4412 | { | |
4413 | /* Add it back to the step-over queue. */ | |
4414 | if (debug_infrun) | |
4415 | { | |
4416 | fprintf_unfiltered (gdb_stdlog, | |
4417 | "infrun: displaced-step of %s " | |
4418 | "canceled: adding back to the " | |
4419 | "step-over queue\n", | |
4420 | target_pid_to_str (t->ptid)); | |
4421 | } | |
4422 | t->control.trap_expected = 0; | |
4423 | thread_step_over_chain_enqueue (t); | |
4424 | } | |
4425 | } | |
4426 | else | |
4427 | { | |
4428 | enum gdb_signal sig; | |
4429 | struct regcache *regcache; | |
4430 | struct address_space *aspace; | |
4431 | ||
4432 | if (debug_infrun) | |
4433 | { | |
4434 | char *statstr; | |
4435 | ||
4436 | statstr = target_waitstatus_to_string (&ws); | |
4437 | fprintf_unfiltered (gdb_stdlog, | |
4438 | "infrun: target_wait %s, saving " | |
4439 | "status for %d.%ld.%ld\n", | |
4440 | statstr, | |
4441 | ptid_get_pid (t->ptid), | |
4442 | ptid_get_lwp (t->ptid), | |
4443 | ptid_get_tid (t->ptid)); | |
4444 | xfree (statstr); | |
4445 | } | |
4446 | ||
4447 | /* Record for later. */ | |
4448 | save_waitstatus (t, &ws); | |
4449 | ||
4450 | sig = (ws.kind == TARGET_WAITKIND_STOPPED | |
4451 | ? ws.value.sig : GDB_SIGNAL_0); | |
4452 | ||
4453 | if (displaced_step_fixup (t->ptid, sig) < 0) | |
4454 | { | |
4455 | /* Add it back to the step-over queue. */ | |
4456 | t->control.trap_expected = 0; | |
4457 | thread_step_over_chain_enqueue (t); | |
4458 | } | |
4459 | ||
4460 | regcache = get_thread_regcache (t->ptid); | |
4461 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4462 | ||
4463 | if (debug_infrun) | |
4464 | { | |
4465 | fprintf_unfiltered (gdb_stdlog, | |
4466 | "infrun: saved stop_pc=%s for %s " | |
4467 | "(currently_stepping=%d)\n", | |
4468 | paddress (target_gdbarch (), | |
4469 | t->suspend.stop_pc), | |
4470 | target_pid_to_str (t->ptid), | |
4471 | currently_stepping (t)); | |
4472 | } | |
4473 | } | |
4474 | } | |
4475 | } | |
4476 | } | |
4477 | ||
4478 | do_cleanups (old_chain); | |
4479 | ||
4480 | if (debug_infrun) | |
4481 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n"); | |
4482 | } | |
4483 | ||
05ba8510 PA |
4484 | /* Given an execution control state that has been freshly filled in by |
4485 | an event from the inferior, figure out what it means and take | |
4486 | appropriate action. | |
4487 | ||
4488 | The alternatives are: | |
4489 | ||
22bcd14b | 4490 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
4491 | debugger. |
4492 | ||
4493 | 2) keep_going and return; to wait for the next event (set | |
4494 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
4495 | once). */ | |
c906108c | 4496 | |
ec9499be | 4497 | static void |
0b6e5e10 | 4498 | handle_inferior_event_1 (struct execution_control_state *ecs) |
cd0fc7c3 | 4499 | { |
d6b48e9c PA |
4500 | enum stop_kind stop_soon; |
4501 | ||
28736962 PA |
4502 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
4503 | { | |
4504 | /* We had an event in the inferior, but we are not interested in | |
4505 | handling it at this level. The lower layers have already | |
4506 | done what needs to be done, if anything. | |
4507 | ||
4508 | One of the possible circumstances for this is when the | |
4509 | inferior produces output for the console. The inferior has | |
4510 | not stopped, and we are ignoring the event. Another possible | |
4511 | circumstance is any event which the lower level knows will be | |
4512 | reported multiple times without an intervening resume. */ | |
4513 | if (debug_infrun) | |
4514 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
4515 | prepare_to_wait (ecs); | |
4516 | return; | |
4517 | } | |
4518 | ||
0e5bf2a8 PA |
4519 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
4520 | && target_can_async_p () && !sync_execution) | |
4521 | { | |
4522 | /* There were no unwaited-for children left in the target, but, | |
4523 | we're not synchronously waiting for events either. Just | |
4524 | ignore. Otherwise, if we were running a synchronous | |
4525 | execution command, we need to cancel it and give the user | |
4526 | back the terminal. */ | |
4527 | if (debug_infrun) | |
4528 | fprintf_unfiltered (gdb_stdlog, | |
4529 | "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n"); | |
4530 | prepare_to_wait (ecs); | |
4531 | return; | |
4532 | } | |
4533 | ||
1777feb0 | 4534 | /* Cache the last pid/waitstatus. */ |
c32c64b7 | 4535 | set_last_target_status (ecs->ptid, ecs->ws); |
e02bc4cc | 4536 | |
ca005067 | 4537 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 4538 | stop_stack_dummy = STOP_NONE; |
ca005067 | 4539 | |
0e5bf2a8 PA |
4540 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
4541 | { | |
4542 | /* No unwaited-for children left. IOW, all resumed children | |
4543 | have exited. */ | |
4544 | if (debug_infrun) | |
4545 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
4546 | ||
4547 | stop_print_frame = 0; | |
22bcd14b | 4548 | stop_waiting (ecs); |
0e5bf2a8 PA |
4549 | return; |
4550 | } | |
4551 | ||
8c90c137 | 4552 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 4553 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 PA |
4554 | { |
4555 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
4556 | /* If it's a new thread, add it to the thread database. */ | |
4557 | if (ecs->event_thread == NULL) | |
4558 | ecs->event_thread = add_thread (ecs->ptid); | |
c1e36e3e PA |
4559 | |
4560 | /* Disable range stepping. If the next step request could use a | |
4561 | range, this will be end up re-enabled then. */ | |
4562 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 4563 | } |
88ed393a JK |
4564 | |
4565 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 4566 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
4567 | |
4568 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
4569 | reinit_frame_cache (); | |
4570 | ||
28736962 PA |
4571 | breakpoint_retire_moribund (); |
4572 | ||
2b009048 DJ |
4573 | /* First, distinguish signals caused by the debugger from signals |
4574 | that have to do with the program's own actions. Note that | |
4575 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
4576 | on the operating system version. Here we detect when a SIGILL or | |
4577 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
4578 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
4579 | when we're trying to execute a breakpoint instruction on a | |
4580 | non-executable stack. This happens for call dummy breakpoints | |
4581 | for architectures like SPARC that place call dummies on the | |
4582 | stack. */ | |
2b009048 | 4583 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
4584 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
4585 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
4586 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 4587 | { |
de0a0249 UW |
4588 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
4589 | ||
4590 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
4591 | regcache_read_pc (regcache))) | |
4592 | { | |
4593 | if (debug_infrun) | |
4594 | fprintf_unfiltered (gdb_stdlog, | |
4595 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 4596 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 4597 | } |
2b009048 DJ |
4598 | } |
4599 | ||
28736962 PA |
4600 | /* Mark the non-executing threads accordingly. In all-stop, all |
4601 | threads of all processes are stopped when we get any event | |
e1316e60 | 4602 | reported. In non-stop mode, only the event thread stops. */ |
372316f1 PA |
4603 | { |
4604 | ptid_t mark_ptid; | |
4605 | ||
fbea99ea | 4606 | if (!target_is_non_stop_p ()) |
372316f1 PA |
4607 | mark_ptid = minus_one_ptid; |
4608 | else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED | |
4609 | || ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4610 | { | |
4611 | /* If we're handling a process exit in non-stop mode, even | |
4612 | though threads haven't been deleted yet, one would think | |
4613 | that there is nothing to do, as threads of the dead process | |
4614 | will be soon deleted, and threads of any other process were | |
4615 | left running. However, on some targets, threads survive a | |
4616 | process exit event. E.g., for the "checkpoint" command, | |
4617 | when the current checkpoint/fork exits, linux-fork.c | |
4618 | automatically switches to another fork from within | |
4619 | target_mourn_inferior, by associating the same | |
4620 | inferior/thread to another fork. We haven't mourned yet at | |
4621 | this point, but we must mark any threads left in the | |
4622 | process as not-executing so that finish_thread_state marks | |
4623 | them stopped (in the user's perspective) if/when we present | |
4624 | the stop to the user. */ | |
4625 | mark_ptid = pid_to_ptid (ptid_get_pid (ecs->ptid)); | |
4626 | } | |
4627 | else | |
4628 | mark_ptid = ecs->ptid; | |
4629 | ||
4630 | set_executing (mark_ptid, 0); | |
4631 | ||
4632 | /* Likewise the resumed flag. */ | |
4633 | set_resumed (mark_ptid, 0); | |
4634 | } | |
8c90c137 | 4635 | |
488f131b JB |
4636 | switch (ecs->ws.kind) |
4637 | { | |
4638 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 4639 | if (debug_infrun) |
8a9de0e4 | 4640 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
5c09a2c5 PA |
4641 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
4642 | context_switch (ecs->ptid); | |
b0f4b84b DJ |
4643 | /* Ignore gracefully during startup of the inferior, as it might |
4644 | be the shell which has just loaded some objects, otherwise | |
4645 | add the symbols for the newly loaded objects. Also ignore at | |
4646 | the beginning of an attach or remote session; we will query | |
4647 | the full list of libraries once the connection is | |
4648 | established. */ | |
4f5d7f63 PA |
4649 | |
4650 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
c0236d92 | 4651 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 4652 | { |
edcc5120 TT |
4653 | struct regcache *regcache; |
4654 | ||
edcc5120 TT |
4655 | regcache = get_thread_regcache (ecs->ptid); |
4656 | ||
4657 | handle_solib_event (); | |
4658 | ||
4659 | ecs->event_thread->control.stop_bpstat | |
4660 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
4661 | stop_pc, ecs->ptid, &ecs->ws); | |
ab04a2af | 4662 | |
ce12b012 | 4663 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
4664 | { |
4665 | /* A catchpoint triggered. */ | |
94c57d6a PA |
4666 | process_event_stop_test (ecs); |
4667 | return; | |
edcc5120 | 4668 | } |
488f131b | 4669 | |
b0f4b84b DJ |
4670 | /* If requested, stop when the dynamic linker notifies |
4671 | gdb of events. This allows the user to get control | |
4672 | and place breakpoints in initializer routines for | |
4673 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 4674 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
4675 | if (stop_on_solib_events) |
4676 | { | |
55409f9d DJ |
4677 | /* Make sure we print "Stopped due to solib-event" in |
4678 | normal_stop. */ | |
4679 | stop_print_frame = 1; | |
4680 | ||
22bcd14b | 4681 | stop_waiting (ecs); |
b0f4b84b DJ |
4682 | return; |
4683 | } | |
488f131b | 4684 | } |
b0f4b84b DJ |
4685 | |
4686 | /* If we are skipping through a shell, or through shared library | |
4687 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 4688 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
4689 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
4690 | { | |
74960c60 VP |
4691 | /* Loading of shared libraries might have changed breakpoint |
4692 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 4693 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 4694 | insert_breakpoints (); |
64ce06e4 | 4695 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
4696 | prepare_to_wait (ecs); |
4697 | return; | |
4698 | } | |
4699 | ||
5c09a2c5 PA |
4700 | /* But stop if we're attaching or setting up a remote |
4701 | connection. */ | |
4702 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
4703 | || stop_soon == STOP_QUIETLY_REMOTE) | |
4704 | { | |
4705 | if (debug_infrun) | |
4706 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 4707 | stop_waiting (ecs); |
5c09a2c5 PA |
4708 | return; |
4709 | } | |
4710 | ||
4711 | internal_error (__FILE__, __LINE__, | |
4712 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 4713 | |
488f131b | 4714 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 4715 | if (debug_infrun) |
8a9de0e4 | 4716 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
64776a0b | 4717 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
8b3ee56d | 4718 | context_switch (ecs->ptid); |
64ce06e4 | 4719 | resume (GDB_SIGNAL_0); |
488f131b JB |
4720 | prepare_to_wait (ecs); |
4721 | return; | |
c5aa993b | 4722 | |
488f131b | 4723 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 4724 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 4725 | if (debug_infrun) |
940c3c06 PA |
4726 | { |
4727 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4728 | fprintf_unfiltered (gdb_stdlog, | |
4729 | "infrun: TARGET_WAITKIND_EXITED\n"); | |
4730 | else | |
4731 | fprintf_unfiltered (gdb_stdlog, | |
4732 | "infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
4733 | } | |
4734 | ||
fb66883a | 4735 | inferior_ptid = ecs->ptid; |
c9657e70 | 4736 | set_current_inferior (find_inferior_ptid (ecs->ptid)); |
6c95b8df PA |
4737 | set_current_program_space (current_inferior ()->pspace); |
4738 | handle_vfork_child_exec_or_exit (0); | |
1777feb0 | 4739 | target_terminal_ours (); /* Must do this before mourn anyway. */ |
488f131b | 4740 | |
0c557179 SDJ |
4741 | /* Clearing any previous state of convenience variables. */ |
4742 | clear_exit_convenience_vars (); | |
4743 | ||
940c3c06 PA |
4744 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
4745 | { | |
4746 | /* Record the exit code in the convenience variable $_exitcode, so | |
4747 | that the user can inspect this again later. */ | |
4748 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
4749 | (LONGEST) ecs->ws.value.integer); | |
4750 | ||
4751 | /* Also record this in the inferior itself. */ | |
4752 | current_inferior ()->has_exit_code = 1; | |
4753 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 4754 | |
98eb56a4 PA |
4755 | /* Support the --return-child-result option. */ |
4756 | return_child_result_value = ecs->ws.value.integer; | |
4757 | ||
fd664c91 | 4758 | observer_notify_exited (ecs->ws.value.integer); |
940c3c06 PA |
4759 | } |
4760 | else | |
0c557179 SDJ |
4761 | { |
4762 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
4763 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4764 | ||
4765 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
4766 | { | |
4767 | /* Set the value of the internal variable $_exitsignal, | |
4768 | which holds the signal uncaught by the inferior. */ | |
4769 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
4770 | gdbarch_gdb_signal_to_target (gdbarch, | |
4771 | ecs->ws.value.sig)); | |
4772 | } | |
4773 | else | |
4774 | { | |
4775 | /* We don't have access to the target's method used for | |
4776 | converting between signal numbers (GDB's internal | |
4777 | representation <-> target's representation). | |
4778 | Therefore, we cannot do a good job at displaying this | |
4779 | information to the user. It's better to just warn | |
4780 | her about it (if infrun debugging is enabled), and | |
4781 | give up. */ | |
4782 | if (debug_infrun) | |
4783 | fprintf_filtered (gdb_stdlog, _("\ | |
4784 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
4785 | } | |
4786 | ||
fd664c91 | 4787 | observer_notify_signal_exited (ecs->ws.value.sig); |
0c557179 | 4788 | } |
8cf64490 | 4789 | |
488f131b JB |
4790 | gdb_flush (gdb_stdout); |
4791 | target_mourn_inferior (); | |
488f131b | 4792 | stop_print_frame = 0; |
22bcd14b | 4793 | stop_waiting (ecs); |
488f131b | 4794 | return; |
c5aa993b | 4795 | |
488f131b | 4796 | /* The following are the only cases in which we keep going; |
1777feb0 | 4797 | the above cases end in a continue or goto. */ |
488f131b | 4798 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 4799 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 4800 | if (debug_infrun) |
fed708ed PA |
4801 | { |
4802 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
4803 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); | |
4804 | else | |
4805 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n"); | |
4806 | } | |
c906108c | 4807 | |
e2d96639 YQ |
4808 | /* Check whether the inferior is displaced stepping. */ |
4809 | { | |
4810 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
4811 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4812 | struct displaced_step_inferior_state *displaced | |
4813 | = get_displaced_stepping_state (ptid_get_pid (ecs->ptid)); | |
4814 | ||
4815 | /* If checking displaced stepping is supported, and thread | |
4816 | ecs->ptid is displaced stepping. */ | |
4817 | if (displaced && ptid_equal (displaced->step_ptid, ecs->ptid)) | |
4818 | { | |
4819 | struct inferior *parent_inf | |
c9657e70 | 4820 | = find_inferior_ptid (ecs->ptid); |
e2d96639 YQ |
4821 | struct regcache *child_regcache; |
4822 | CORE_ADDR parent_pc; | |
4823 | ||
4824 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
4825 | indicating that the displaced stepping of syscall instruction | |
4826 | has been done. Perform cleanup for parent process here. Note | |
4827 | that this operation also cleans up the child process for vfork, | |
4828 | because their pages are shared. */ | |
a493e3e2 | 4829 | displaced_step_fixup (ecs->ptid, GDB_SIGNAL_TRAP); |
c2829269 PA |
4830 | /* Start a new step-over in another thread if there's one |
4831 | that needs it. */ | |
4832 | start_step_over (); | |
e2d96639 YQ |
4833 | |
4834 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
4835 | { | |
4836 | /* Restore scratch pad for child process. */ | |
4837 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
4838 | } | |
4839 | ||
4840 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
4841 | the child's PC is also within the scratchpad. Set the child's PC | |
4842 | to the parent's PC value, which has already been fixed up. | |
4843 | FIXME: we use the parent's aspace here, although we're touching | |
4844 | the child, because the child hasn't been added to the inferior | |
4845 | list yet at this point. */ | |
4846 | ||
4847 | child_regcache | |
4848 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
4849 | gdbarch, | |
4850 | parent_inf->aspace); | |
4851 | /* Read PC value of parent process. */ | |
4852 | parent_pc = regcache_read_pc (regcache); | |
4853 | ||
4854 | if (debug_displaced) | |
4855 | fprintf_unfiltered (gdb_stdlog, | |
4856 | "displaced: write child pc from %s to %s\n", | |
4857 | paddress (gdbarch, | |
4858 | regcache_read_pc (child_regcache)), | |
4859 | paddress (gdbarch, parent_pc)); | |
4860 | ||
4861 | regcache_write_pc (child_regcache, parent_pc); | |
4862 | } | |
4863 | } | |
4864 | ||
5a2901d9 | 4865 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 4866 | context_switch (ecs->ptid); |
5a2901d9 | 4867 | |
b242c3c2 PA |
4868 | /* Immediately detach breakpoints from the child before there's |
4869 | any chance of letting the user delete breakpoints from the | |
4870 | breakpoint lists. If we don't do this early, it's easy to | |
4871 | leave left over traps in the child, vis: "break foo; catch | |
4872 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
4873 | the fork on the last `continue', and by that time the | |
4874 | breakpoint at "foo" is long gone from the breakpoint table. | |
4875 | If we vforked, then we don't need to unpatch here, since both | |
4876 | parent and child are sharing the same memory pages; we'll | |
4877 | need to unpatch at follow/detach time instead to be certain | |
4878 | that new breakpoints added between catchpoint hit time and | |
4879 | vfork follow are detached. */ | |
4880 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
4881 | { | |
b242c3c2 PA |
4882 | /* This won't actually modify the breakpoint list, but will |
4883 | physically remove the breakpoints from the child. */ | |
d80ee84f | 4884 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
4885 | } |
4886 | ||
34b7e8a6 | 4887 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 4888 | |
e58b0e63 PA |
4889 | /* In case the event is caught by a catchpoint, remember that |
4890 | the event is to be followed at the next resume of the thread, | |
4891 | and not immediately. */ | |
4892 | ecs->event_thread->pending_follow = ecs->ws; | |
4893 | ||
fb14de7b | 4894 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 4895 | |
16c381f0 | 4896 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4897 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 4898 | stop_pc, ecs->ptid, &ecs->ws); |
675bf4cb | 4899 | |
ce12b012 PA |
4900 | /* If no catchpoint triggered for this, then keep going. Note |
4901 | that we're interested in knowing the bpstat actually causes a | |
4902 | stop, not just if it may explain the signal. Software | |
4903 | watchpoints, for example, always appear in the bpstat. */ | |
4904 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 4905 | { |
6c95b8df PA |
4906 | ptid_t parent; |
4907 | ptid_t child; | |
e58b0e63 | 4908 | int should_resume; |
3e43a32a MS |
4909 | int follow_child |
4910 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 4911 | |
a493e3e2 | 4912 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 PA |
4913 | |
4914 | should_resume = follow_fork (); | |
4915 | ||
6c95b8df PA |
4916 | parent = ecs->ptid; |
4917 | child = ecs->ws.value.related_pid; | |
4918 | ||
4919 | /* In non-stop mode, also resume the other branch. */ | |
fbea99ea PA |
4920 | if (!detach_fork && (non_stop |
4921 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
4922 | { |
4923 | if (follow_child) | |
4924 | switch_to_thread (parent); | |
4925 | else | |
4926 | switch_to_thread (child); | |
4927 | ||
4928 | ecs->event_thread = inferior_thread (); | |
4929 | ecs->ptid = inferior_ptid; | |
4930 | keep_going (ecs); | |
4931 | } | |
4932 | ||
4933 | if (follow_child) | |
4934 | switch_to_thread (child); | |
4935 | else | |
4936 | switch_to_thread (parent); | |
4937 | ||
e58b0e63 PA |
4938 | ecs->event_thread = inferior_thread (); |
4939 | ecs->ptid = inferior_ptid; | |
4940 | ||
4941 | if (should_resume) | |
4942 | keep_going (ecs); | |
4943 | else | |
22bcd14b | 4944 | stop_waiting (ecs); |
04e68871 DJ |
4945 | return; |
4946 | } | |
94c57d6a PA |
4947 | process_event_stop_test (ecs); |
4948 | return; | |
488f131b | 4949 | |
6c95b8df PA |
4950 | case TARGET_WAITKIND_VFORK_DONE: |
4951 | /* Done with the shared memory region. Re-insert breakpoints in | |
4952 | the parent, and keep going. */ | |
4953 | ||
4954 | if (debug_infrun) | |
3e43a32a MS |
4955 | fprintf_unfiltered (gdb_stdlog, |
4956 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
6c95b8df PA |
4957 | |
4958 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
4959 | context_switch (ecs->ptid); | |
4960 | ||
4961 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 4962 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
6c95b8df PA |
4963 | /* This also takes care of reinserting breakpoints in the |
4964 | previously locked inferior. */ | |
4965 | keep_going (ecs); | |
4966 | return; | |
4967 | ||
488f131b | 4968 | case TARGET_WAITKIND_EXECD: |
527159b7 | 4969 | if (debug_infrun) |
fc5261f2 | 4970 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 4971 | |
5a2901d9 | 4972 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 4973 | context_switch (ecs->ptid); |
5a2901d9 | 4974 | |
fb14de7b | 4975 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
795e548f | 4976 | |
6c95b8df PA |
4977 | /* Do whatever is necessary to the parent branch of the vfork. */ |
4978 | handle_vfork_child_exec_or_exit (1); | |
4979 | ||
795e548f PA |
4980 | /* This causes the eventpoints and symbol table to be reset. |
4981 | Must do this now, before trying to determine whether to | |
4982 | stop. */ | |
71b43ef8 | 4983 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 4984 | |
17d8546e DB |
4985 | /* In follow_exec we may have deleted the original thread and |
4986 | created a new one. Make sure that the event thread is the | |
4987 | execd thread for that case (this is a nop otherwise). */ | |
4988 | ecs->event_thread = inferior_thread (); | |
4989 | ||
16c381f0 | 4990 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4991 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 4992 | stop_pc, ecs->ptid, &ecs->ws); |
795e548f | 4993 | |
71b43ef8 PA |
4994 | /* Note that this may be referenced from inside |
4995 | bpstat_stop_status above, through inferior_has_execd. */ | |
4996 | xfree (ecs->ws.value.execd_pathname); | |
4997 | ecs->ws.value.execd_pathname = NULL; | |
4998 | ||
04e68871 | 4999 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5000 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5001 | { |
a493e3e2 | 5002 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5003 | keep_going (ecs); |
5004 | return; | |
5005 | } | |
94c57d6a PA |
5006 | process_event_stop_test (ecs); |
5007 | return; | |
488f131b | 5008 | |
b4dc5ffa MK |
5009 | /* Be careful not to try to gather much state about a thread |
5010 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5011 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 5012 | if (debug_infrun) |
3e43a32a MS |
5013 | fprintf_unfiltered (gdb_stdlog, |
5014 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
1777feb0 | 5015 | /* Getting the current syscall number. */ |
94c57d6a PA |
5016 | if (handle_syscall_event (ecs) == 0) |
5017 | process_event_stop_test (ecs); | |
5018 | return; | |
c906108c | 5019 | |
488f131b JB |
5020 | /* Before examining the threads further, step this thread to |
5021 | get it entirely out of the syscall. (We get notice of the | |
5022 | event when the thread is just on the verge of exiting a | |
5023 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5024 | into user code.) */ |
488f131b | 5025 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 5026 | if (debug_infrun) |
3e43a32a MS |
5027 | fprintf_unfiltered (gdb_stdlog, |
5028 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
94c57d6a PA |
5029 | if (handle_syscall_event (ecs) == 0) |
5030 | process_event_stop_test (ecs); | |
5031 | return; | |
c906108c | 5032 | |
488f131b | 5033 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 5034 | if (debug_infrun) |
8a9de0e4 | 5035 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
16c381f0 | 5036 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
4f5d7f63 PA |
5037 | handle_signal_stop (ecs); |
5038 | return; | |
c906108c | 5039 | |
b2175913 | 5040 | case TARGET_WAITKIND_NO_HISTORY: |
4b4e080e PA |
5041 | if (debug_infrun) |
5042 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
b2175913 | 5043 | /* Reverse execution: target ran out of history info. */ |
eab402df | 5044 | |
34b7e8a6 | 5045 | delete_just_stopped_threads_single_step_breakpoints (); |
fb14de7b | 5046 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
fd664c91 | 5047 | observer_notify_no_history (); |
22bcd14b | 5048 | stop_waiting (ecs); |
b2175913 | 5049 | return; |
488f131b | 5050 | } |
4f5d7f63 PA |
5051 | } |
5052 | ||
0b6e5e10 JB |
5053 | /* A wrapper around handle_inferior_event_1, which also makes sure |
5054 | that all temporary struct value objects that were created during | |
5055 | the handling of the event get deleted at the end. */ | |
5056 | ||
5057 | static void | |
5058 | handle_inferior_event (struct execution_control_state *ecs) | |
5059 | { | |
5060 | struct value *mark = value_mark (); | |
5061 | ||
5062 | handle_inferior_event_1 (ecs); | |
5063 | /* Purge all temporary values created during the event handling, | |
5064 | as it could be a long time before we return to the command level | |
5065 | where such values would otherwise be purged. */ | |
5066 | value_free_to_mark (mark); | |
5067 | } | |
5068 | ||
372316f1 PA |
5069 | /* Restart threads back to what they were trying to do back when we |
5070 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5071 | ignored. */ | |
4d9d9d04 PA |
5072 | |
5073 | static void | |
372316f1 PA |
5074 | restart_threads (struct thread_info *event_thread) |
5075 | { | |
5076 | struct thread_info *tp; | |
5077 | struct thread_info *step_over = NULL; | |
5078 | ||
5079 | /* In case the instruction just stepped spawned a new thread. */ | |
5080 | update_thread_list (); | |
5081 | ||
5082 | ALL_NON_EXITED_THREADS (tp) | |
5083 | { | |
5084 | if (tp == event_thread) | |
5085 | { | |
5086 | if (debug_infrun) | |
5087 | fprintf_unfiltered (gdb_stdlog, | |
5088 | "infrun: restart threads: " | |
5089 | "[%s] is event thread\n", | |
5090 | target_pid_to_str (tp->ptid)); | |
5091 | continue; | |
5092 | } | |
5093 | ||
5094 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5095 | { | |
5096 | if (debug_infrun) | |
5097 | fprintf_unfiltered (gdb_stdlog, | |
5098 | "infrun: restart threads: " | |
5099 | "[%s] not meant to be running\n", | |
5100 | target_pid_to_str (tp->ptid)); | |
5101 | continue; | |
5102 | } | |
5103 | ||
5104 | if (tp->resumed) | |
5105 | { | |
5106 | if (debug_infrun) | |
5107 | fprintf_unfiltered (gdb_stdlog, | |
5108 | "infrun: restart threads: [%s] resumed\n", | |
5109 | target_pid_to_str (tp->ptid)); | |
5110 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
5111 | continue; | |
5112 | } | |
5113 | ||
5114 | if (thread_is_in_step_over_chain (tp)) | |
5115 | { | |
5116 | if (debug_infrun) | |
5117 | fprintf_unfiltered (gdb_stdlog, | |
5118 | "infrun: restart threads: " | |
5119 | "[%s] needs step-over\n", | |
5120 | target_pid_to_str (tp->ptid)); | |
5121 | gdb_assert (!tp->resumed); | |
5122 | continue; | |
5123 | } | |
5124 | ||
5125 | ||
5126 | if (tp->suspend.waitstatus_pending_p) | |
5127 | { | |
5128 | if (debug_infrun) | |
5129 | fprintf_unfiltered (gdb_stdlog, | |
5130 | "infrun: restart threads: " | |
5131 | "[%s] has pending status\n", | |
5132 | target_pid_to_str (tp->ptid)); | |
5133 | tp->resumed = 1; | |
5134 | continue; | |
5135 | } | |
5136 | ||
5137 | /* If some thread needs to start a step-over at this point, it | |
5138 | should still be in the step-over queue, and thus skipped | |
5139 | above. */ | |
5140 | if (thread_still_needs_step_over (tp)) | |
5141 | { | |
5142 | internal_error (__FILE__, __LINE__, | |
5143 | "thread [%s] needs a step-over, but not in " | |
5144 | "step-over queue\n", | |
5145 | target_pid_to_str (tp->ptid)); | |
5146 | } | |
5147 | ||
5148 | if (currently_stepping (tp)) | |
5149 | { | |
5150 | if (debug_infrun) | |
5151 | fprintf_unfiltered (gdb_stdlog, | |
5152 | "infrun: restart threads: [%s] was stepping\n", | |
5153 | target_pid_to_str (tp->ptid)); | |
5154 | keep_going_stepped_thread (tp); | |
5155 | } | |
5156 | else | |
5157 | { | |
5158 | struct execution_control_state ecss; | |
5159 | struct execution_control_state *ecs = &ecss; | |
5160 | ||
5161 | if (debug_infrun) | |
5162 | fprintf_unfiltered (gdb_stdlog, | |
5163 | "infrun: restart threads: [%s] continuing\n", | |
5164 | target_pid_to_str (tp->ptid)); | |
5165 | reset_ecs (ecs, tp); | |
5166 | switch_to_thread (tp->ptid); | |
5167 | keep_going_pass_signal (ecs); | |
5168 | } | |
5169 | } | |
5170 | } | |
5171 | ||
5172 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5173 | a pending waitstatus. */ | |
5174 | ||
5175 | static int | |
5176 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5177 | void *arg) | |
5178 | { | |
5179 | return (tp->resumed | |
5180 | && tp->suspend.waitstatus_pending_p); | |
5181 | } | |
5182 | ||
5183 | /* Called when we get an event that may finish an in-line or | |
5184 | out-of-line (displaced stepping) step-over started previously. | |
5185 | Return true if the event is processed and we should go back to the | |
5186 | event loop; false if the caller should continue processing the | |
5187 | event. */ | |
5188 | ||
5189 | static int | |
4d9d9d04 PA |
5190 | finish_step_over (struct execution_control_state *ecs) |
5191 | { | |
372316f1 PA |
5192 | int had_step_over_info; |
5193 | ||
4d9d9d04 PA |
5194 | displaced_step_fixup (ecs->ptid, |
5195 | ecs->event_thread->suspend.stop_signal); | |
5196 | ||
372316f1 PA |
5197 | had_step_over_info = step_over_info_valid_p (); |
5198 | ||
5199 | if (had_step_over_info) | |
4d9d9d04 PA |
5200 | { |
5201 | /* If we're stepping over a breakpoint with all threads locked, | |
5202 | then only the thread that was stepped should be reporting | |
5203 | back an event. */ | |
5204 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5205 | ||
5206 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5207 | clear_step_over_info (); | |
5208 | } | |
5209 | ||
fbea99ea | 5210 | if (!target_is_non_stop_p ()) |
372316f1 | 5211 | return 0; |
4d9d9d04 PA |
5212 | |
5213 | /* Start a new step-over in another thread if there's one that | |
5214 | needs it. */ | |
5215 | start_step_over (); | |
372316f1 PA |
5216 | |
5217 | /* If we were stepping over a breakpoint before, and haven't started | |
5218 | a new in-line step-over sequence, then restart all other threads | |
5219 | (except the event thread). We can't do this in all-stop, as then | |
5220 | e.g., we wouldn't be able to issue any other remote packet until | |
5221 | these other threads stop. */ | |
5222 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5223 | { | |
5224 | struct thread_info *pending; | |
5225 | ||
5226 | /* If we only have threads with pending statuses, the restart | |
5227 | below won't restart any thread and so nothing re-inserts the | |
5228 | breakpoint we just stepped over. But we need it inserted | |
5229 | when we later process the pending events, otherwise if | |
5230 | another thread has a pending event for this breakpoint too, | |
5231 | we'd discard its event (because the breakpoint that | |
5232 | originally caused the event was no longer inserted). */ | |
5233 | context_switch (ecs->ptid); | |
5234 | insert_breakpoints (); | |
5235 | ||
5236 | restart_threads (ecs->event_thread); | |
5237 | ||
5238 | /* If we have events pending, go through handle_inferior_event | |
5239 | again, picking up a pending event at random. This avoids | |
5240 | thread starvation. */ | |
5241 | ||
5242 | /* But not if we just stepped over a watchpoint in order to let | |
5243 | the instruction execute so we can evaluate its expression. | |
5244 | The set of watchpoints that triggered is recorded in the | |
5245 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5246 | If we processed another event first, that other event could | |
5247 | clobber this info. */ | |
5248 | if (ecs->event_thread->stepping_over_watchpoint) | |
5249 | return 0; | |
5250 | ||
5251 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5252 | NULL); | |
5253 | if (pending != NULL) | |
5254 | { | |
5255 | struct thread_info *tp = ecs->event_thread; | |
5256 | struct regcache *regcache; | |
5257 | ||
5258 | if (debug_infrun) | |
5259 | { | |
5260 | fprintf_unfiltered (gdb_stdlog, | |
5261 | "infrun: found resumed threads with " | |
5262 | "pending events, saving status\n"); | |
5263 | } | |
5264 | ||
5265 | gdb_assert (pending != tp); | |
5266 | ||
5267 | /* Record the event thread's event for later. */ | |
5268 | save_waitstatus (tp, &ecs->ws); | |
5269 | /* This was cleared early, by handle_inferior_event. Set it | |
5270 | so this pending event is considered by | |
5271 | do_target_wait. */ | |
5272 | tp->resumed = 1; | |
5273 | ||
5274 | gdb_assert (!tp->executing); | |
5275 | ||
5276 | regcache = get_thread_regcache (tp->ptid); | |
5277 | tp->suspend.stop_pc = regcache_read_pc (regcache); | |
5278 | ||
5279 | if (debug_infrun) | |
5280 | { | |
5281 | fprintf_unfiltered (gdb_stdlog, | |
5282 | "infrun: saved stop_pc=%s for %s " | |
5283 | "(currently_stepping=%d)\n", | |
5284 | paddress (target_gdbarch (), | |
5285 | tp->suspend.stop_pc), | |
5286 | target_pid_to_str (tp->ptid), | |
5287 | currently_stepping (tp)); | |
5288 | } | |
5289 | ||
5290 | /* This in-line step-over finished; clear this so we won't | |
5291 | start a new one. This is what handle_signal_stop would | |
5292 | do, if we returned false. */ | |
5293 | tp->stepping_over_breakpoint = 0; | |
5294 | ||
5295 | /* Wake up the event loop again. */ | |
5296 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5297 | ||
5298 | prepare_to_wait (ecs); | |
5299 | return 1; | |
5300 | } | |
5301 | } | |
5302 | ||
5303 | return 0; | |
4d9d9d04 PA |
5304 | } |
5305 | ||
4f5d7f63 PA |
5306 | /* Come here when the program has stopped with a signal. */ |
5307 | ||
5308 | static void | |
5309 | handle_signal_stop (struct execution_control_state *ecs) | |
5310 | { | |
5311 | struct frame_info *frame; | |
5312 | struct gdbarch *gdbarch; | |
5313 | int stopped_by_watchpoint; | |
5314 | enum stop_kind stop_soon; | |
5315 | int random_signal; | |
c906108c | 5316 | |
f0407826 DE |
5317 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5318 | ||
5319 | /* Do we need to clean up the state of a thread that has | |
5320 | completed a displaced single-step? (Doing so usually affects | |
5321 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5322 | if (finish_step_over (ecs)) |
5323 | return; | |
f0407826 DE |
5324 | |
5325 | /* If we either finished a single-step or hit a breakpoint, but | |
5326 | the user wanted this thread to be stopped, pretend we got a | |
5327 | SIG0 (generic unsignaled stop). */ | |
5328 | if (ecs->event_thread->stop_requested | |
5329 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5330 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5331 | |
515630c5 | 5332 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 5333 | |
527159b7 | 5334 | if (debug_infrun) |
237fc4c9 | 5335 | { |
5af949e3 UW |
5336 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
5337 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7f82dfc7 JK |
5338 | struct cleanup *old_chain = save_inferior_ptid (); |
5339 | ||
5340 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
5341 | |
5342 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
5343 | paddress (gdbarch, stop_pc)); | |
d92524f1 | 5344 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5345 | { |
5346 | CORE_ADDR addr; | |
abbb1732 | 5347 | |
237fc4c9 PA |
5348 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
5349 | ||
5350 | if (target_stopped_data_address (¤t_target, &addr)) | |
5351 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5352 | "infrun: stopped data address = %s\n", |
5353 | paddress (gdbarch, addr)); | |
237fc4c9 PA |
5354 | else |
5355 | fprintf_unfiltered (gdb_stdlog, | |
5356 | "infrun: (no data address available)\n"); | |
5357 | } | |
7f82dfc7 JK |
5358 | |
5359 | do_cleanups (old_chain); | |
237fc4c9 | 5360 | } |
527159b7 | 5361 | |
36fa8042 PA |
5362 | /* This is originated from start_remote(), start_inferior() and |
5363 | shared libraries hook functions. */ | |
5364 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
5365 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) | |
5366 | { | |
5367 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5368 | context_switch (ecs->ptid); | |
5369 | if (debug_infrun) | |
5370 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
5371 | stop_print_frame = 1; | |
22bcd14b | 5372 | stop_waiting (ecs); |
36fa8042 PA |
5373 | return; |
5374 | } | |
5375 | ||
5376 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5377 | && stop_after_trap) | |
5378 | { | |
5379 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5380 | context_switch (ecs->ptid); | |
5381 | if (debug_infrun) | |
5382 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
5383 | stop_print_frame = 0; | |
22bcd14b | 5384 | stop_waiting (ecs); |
36fa8042 PA |
5385 | return; |
5386 | } | |
5387 | ||
5388 | /* This originates from attach_command(). We need to overwrite | |
5389 | the stop_signal here, because some kernels don't ignore a | |
5390 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5391 | See more comments in inferior.h. On the other hand, if we | |
5392 | get a non-SIGSTOP, report it to the user - assume the backend | |
5393 | will handle the SIGSTOP if it should show up later. | |
5394 | ||
5395 | Also consider that the attach is complete when we see a | |
5396 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5397 | target extended-remote report it instead of a SIGSTOP | |
5398 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5399 | signal, so this is no exception. | |
5400 | ||
5401 | Also consider that the attach is complete when we see a | |
5402 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5403 | the target to stop all threads of the inferior, in case the | |
5404 | low level attach operation doesn't stop them implicitly. If | |
5405 | they weren't stopped implicitly, then the stub will report a | |
5406 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5407 | other than GDB's request. */ | |
5408 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5409 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5410 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5411 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5412 | { | |
5413 | stop_print_frame = 1; | |
22bcd14b | 5414 | stop_waiting (ecs); |
36fa8042 PA |
5415 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5416 | return; | |
5417 | } | |
5418 | ||
488f131b | 5419 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
5420 | so, then switch to that thread. */ |
5421 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 5422 | { |
527159b7 | 5423 | if (debug_infrun) |
8a9de0e4 | 5424 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 5425 | |
0d1e5fa7 | 5426 | context_switch (ecs->ptid); |
c5aa993b | 5427 | |
9a4105ab AC |
5428 | if (deprecated_context_hook) |
5429 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 5430 | } |
c906108c | 5431 | |
568d6575 UW |
5432 | /* At this point, get hold of the now-current thread's frame. */ |
5433 | frame = get_current_frame (); | |
5434 | gdbarch = get_frame_arch (frame); | |
5435 | ||
2adfaa28 | 5436 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5437 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5438 | { |
af48d08f PA |
5439 | struct regcache *regcache; |
5440 | struct address_space *aspace; | |
5441 | CORE_ADDR pc; | |
2adfaa28 | 5442 | |
af48d08f PA |
5443 | regcache = get_thread_regcache (ecs->ptid); |
5444 | aspace = get_regcache_aspace (regcache); | |
5445 | pc = regcache_read_pc (regcache); | |
34b7e8a6 | 5446 | |
af48d08f PA |
5447 | /* However, before doing so, if this single-step breakpoint was |
5448 | actually for another thread, set this thread up for moving | |
5449 | past it. */ | |
5450 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5451 | aspace, pc)) | |
5452 | { | |
5453 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
5454 | { |
5455 | if (debug_infrun) | |
5456 | { | |
5457 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 5458 | "infrun: [%s] hit another thread's " |
34b7e8a6 PA |
5459 | "single-step breakpoint\n", |
5460 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 | 5461 | } |
af48d08f PA |
5462 | ecs->hit_singlestep_breakpoint = 1; |
5463 | } | |
5464 | } | |
5465 | else | |
5466 | { | |
5467 | if (debug_infrun) | |
5468 | { | |
5469 | fprintf_unfiltered (gdb_stdlog, | |
5470 | "infrun: [%s] hit its " | |
5471 | "single-step breakpoint\n", | |
5472 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 PA |
5473 | } |
5474 | } | |
488f131b | 5475 | } |
af48d08f | 5476 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5477 | |
963f9c80 PA |
5478 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5479 | && ecs->event_thread->control.trap_expected | |
5480 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5481 | stopped_by_watchpoint = 0; |
5482 | else | |
5483 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5484 | ||
5485 | /* If necessary, step over this watchpoint. We'll be back to display | |
5486 | it in a moment. */ | |
5487 | if (stopped_by_watchpoint | |
d92524f1 | 5488 | && (target_have_steppable_watchpoint |
568d6575 | 5489 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5490 | { |
488f131b JB |
5491 | /* At this point, we are stopped at an instruction which has |
5492 | attempted to write to a piece of memory under control of | |
5493 | a watchpoint. The instruction hasn't actually executed | |
5494 | yet. If we were to evaluate the watchpoint expression | |
5495 | now, we would get the old value, and therefore no change | |
5496 | would seem to have occurred. | |
5497 | ||
5498 | In order to make watchpoints work `right', we really need | |
5499 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5500 | watchpoint expression. We do this by single-stepping the |
5501 | target. | |
5502 | ||
7f89fd65 | 5503 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5504 | it. For example, the PA can (with some kernel cooperation) |
5505 | single step over a watchpoint without disabling the watchpoint. | |
5506 | ||
5507 | It is far more common to need to disable a watchpoint to step | |
5508 | the inferior over it. If we have non-steppable watchpoints, | |
5509 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5510 | disable all watchpoints. |
5511 | ||
5512 | Any breakpoint at PC must also be stepped over -- if there's | |
5513 | one, it will have already triggered before the watchpoint | |
5514 | triggered, and we either already reported it to the user, or | |
5515 | it didn't cause a stop and we called keep_going. In either | |
5516 | case, if there was a breakpoint at PC, we must be trying to | |
5517 | step past it. */ | |
5518 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5519 | keep_going (ecs); | |
488f131b JB |
5520 | return; |
5521 | } | |
5522 | ||
4e1c45ea | 5523 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5524 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5525 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5526 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5527 | stop_print_frame = 1; |
488f131b | 5528 | stopped_by_random_signal = 0; |
488f131b | 5529 | |
edb3359d DJ |
5530 | /* Hide inlined functions starting here, unless we just performed stepi or |
5531 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5532 | inline function call sites). */ | |
16c381f0 | 5533 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f GB |
5534 | { |
5535 | struct address_space *aspace = | |
5536 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
5537 | ||
5538 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5539 | determine that the address is one where functions cannot have | |
5540 | been inlined. This improves performance with inferiors that | |
5541 | load a lot of shared libraries, because the solib event | |
5542 | breakpoint is defined as the address of a function (i.e. not | |
5543 | inline). Note that we have to check the previous PC as well | |
5544 | as the current one to catch cases when we have just | |
5545 | single-stepped off a breakpoint prior to reinstating it. | |
5546 | Note that we're assuming that the code we single-step to is | |
5547 | not inline, but that's not definitive: there's nothing | |
5548 | preventing the event breakpoint function from containing | |
5549 | inlined code, and the single-step ending up there. If the | |
5550 | user had set a breakpoint on that inlined code, the missing | |
5551 | skip_inline_frames call would break things. Fortunately | |
5552 | that's an extremely unlikely scenario. */ | |
09ac7c10 | 5553 | if (!pc_at_non_inline_function (aspace, stop_pc, &ecs->ws) |
a210c238 MR |
5554 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5555 | && ecs->event_thread->control.trap_expected | |
5556 | && pc_at_non_inline_function (aspace, | |
5557 | ecs->event_thread->prev_pc, | |
09ac7c10 | 5558 | &ecs->ws))) |
1c5a993e MR |
5559 | { |
5560 | skip_inline_frames (ecs->ptid); | |
5561 | ||
5562 | /* Re-fetch current thread's frame in case that invalidated | |
5563 | the frame cache. */ | |
5564 | frame = get_current_frame (); | |
5565 | gdbarch = get_frame_arch (frame); | |
5566 | } | |
0574c78f | 5567 | } |
edb3359d | 5568 | |
a493e3e2 | 5569 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 5570 | && ecs->event_thread->control.trap_expected |
568d6575 | 5571 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 5572 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 5573 | { |
b50d7442 | 5574 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 5575 | also on an instruction that needs to be stepped multiple |
1777feb0 | 5576 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
5577 | with a delay slot. It needs to be stepped twice, once for |
5578 | the instruction and once for the delay slot. */ | |
5579 | int step_through_delay | |
568d6575 | 5580 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 5581 | |
527159b7 | 5582 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 5583 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
5584 | if (ecs->event_thread->control.step_range_end == 0 |
5585 | && step_through_delay) | |
3352ef37 AC |
5586 | { |
5587 | /* The user issued a continue when stopped at a breakpoint. | |
5588 | Set up for another trap and get out of here. */ | |
4e1c45ea | 5589 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5590 | keep_going (ecs); |
5591 | return; | |
5592 | } | |
5593 | else if (step_through_delay) | |
5594 | { | |
5595 | /* The user issued a step when stopped at a breakpoint. | |
5596 | Maybe we should stop, maybe we should not - the delay | |
5597 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
5598 | case, don't decide that here, just set |
5599 | ecs->stepping_over_breakpoint, making sure we | |
5600 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 5601 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5602 | } |
5603 | } | |
5604 | ||
ab04a2af TT |
5605 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
5606 | handles this event. */ | |
5607 | ecs->event_thread->control.stop_bpstat | |
5608 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
5609 | stop_pc, ecs->ptid, &ecs->ws); | |
db82e815 | 5610 | |
ab04a2af TT |
5611 | /* Following in case break condition called a |
5612 | function. */ | |
5613 | stop_print_frame = 1; | |
73dd234f | 5614 | |
ab04a2af TT |
5615 | /* This is where we handle "moribund" watchpoints. Unlike |
5616 | software breakpoints traps, hardware watchpoint traps are | |
5617 | always distinguishable from random traps. If no high-level | |
5618 | watchpoint is associated with the reported stop data address | |
5619 | anymore, then the bpstat does not explain the signal --- | |
5620 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
5621 | set. */ | |
5622 | ||
5623 | if (debug_infrun | |
5624 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 5625 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 5626 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
5627 | && stopped_by_watchpoint) |
5628 | fprintf_unfiltered (gdb_stdlog, | |
5629 | "infrun: no user watchpoint explains " | |
5630 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 5631 | |
bac7d97b | 5632 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
5633 | at one stage in the past included checks for an inferior |
5634 | function call's call dummy's return breakpoint. The original | |
5635 | comment, that went with the test, read: | |
03cebad2 | 5636 | |
ab04a2af TT |
5637 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
5638 | another signal besides SIGTRAP, so check here as well as | |
5639 | above.'' | |
73dd234f | 5640 | |
ab04a2af TT |
5641 | If someone ever tries to get call dummys on a |
5642 | non-executable stack to work (where the target would stop | |
5643 | with something like a SIGSEGV), then those tests might need | |
5644 | to be re-instated. Given, however, that the tests were only | |
5645 | enabled when momentary breakpoints were not being used, I | |
5646 | suspect that it won't be the case. | |
488f131b | 5647 | |
ab04a2af TT |
5648 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
5649 | be necessary for call dummies on a non-executable stack on | |
5650 | SPARC. */ | |
488f131b | 5651 | |
bac7d97b | 5652 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
5653 | random_signal |
5654 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
5655 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 5656 | |
1cf4d951 PA |
5657 | /* Maybe this was a trap for a software breakpoint that has since |
5658 | been removed. */ | |
5659 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
5660 | { | |
5661 | if (program_breakpoint_here_p (gdbarch, stop_pc)) | |
5662 | { | |
5663 | struct regcache *regcache; | |
5664 | int decr_pc; | |
5665 | ||
5666 | /* Re-adjust PC to what the program would see if GDB was not | |
5667 | debugging it. */ | |
5668 | regcache = get_thread_regcache (ecs->event_thread->ptid); | |
527a273a | 5669 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
5670 | if (decr_pc != 0) |
5671 | { | |
5672 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); | |
5673 | ||
5674 | if (record_full_is_used ()) | |
5675 | record_full_gdb_operation_disable_set (); | |
5676 | ||
5677 | regcache_write_pc (regcache, stop_pc + decr_pc); | |
5678 | ||
5679 | do_cleanups (old_cleanups); | |
5680 | } | |
5681 | } | |
5682 | else | |
5683 | { | |
5684 | /* A delayed software breakpoint event. Ignore the trap. */ | |
5685 | if (debug_infrun) | |
5686 | fprintf_unfiltered (gdb_stdlog, | |
5687 | "infrun: delayed software breakpoint " | |
5688 | "trap, ignoring\n"); | |
5689 | random_signal = 0; | |
5690 | } | |
5691 | } | |
5692 | ||
5693 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
5694 | has since been removed. */ | |
5695 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
5696 | { | |
5697 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
5698 | if (debug_infrun) | |
5699 | fprintf_unfiltered (gdb_stdlog, | |
5700 | "infrun: delayed hardware breakpoint/watchpoint " | |
5701 | "trap, ignoring\n"); | |
5702 | random_signal = 0; | |
5703 | } | |
5704 | ||
bac7d97b PA |
5705 | /* If not, perhaps stepping/nexting can. */ |
5706 | if (random_signal) | |
5707 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5708 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 5709 | |
2adfaa28 PA |
5710 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
5711 | thread. Single-step breakpoints are transparent to the | |
5712 | breakpoints module. */ | |
5713 | if (random_signal) | |
5714 | random_signal = !ecs->hit_singlestep_breakpoint; | |
5715 | ||
bac7d97b PA |
5716 | /* No? Perhaps we got a moribund watchpoint. */ |
5717 | if (random_signal) | |
5718 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 5719 | |
488f131b JB |
5720 | /* For the program's own signals, act according to |
5721 | the signal handling tables. */ | |
5722 | ||
ce12b012 | 5723 | if (random_signal) |
488f131b JB |
5724 | { |
5725 | /* Signal not for debugging purposes. */ | |
c9657e70 | 5726 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
c9737c08 | 5727 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 5728 | |
527159b7 | 5729 | if (debug_infrun) |
c9737c08 PA |
5730 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
5731 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 5732 | |
488f131b JB |
5733 | stopped_by_random_signal = 1; |
5734 | ||
252fbfc8 PA |
5735 | /* Always stop on signals if we're either just gaining control |
5736 | of the program, or the user explicitly requested this thread | |
5737 | to remain stopped. */ | |
d6b48e9c | 5738 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 5739 | || ecs->event_thread->stop_requested |
24291992 | 5740 | || (!inf->detaching |
16c381f0 | 5741 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 5742 | { |
22bcd14b | 5743 | stop_waiting (ecs); |
488f131b JB |
5744 | return; |
5745 | } | |
b57bacec PA |
5746 | |
5747 | /* Notify observers the signal has "handle print" set. Note we | |
5748 | returned early above if stopping; normal_stop handles the | |
5749 | printing in that case. */ | |
5750 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
5751 | { | |
5752 | /* The signal table tells us to print about this signal. */ | |
5753 | target_terminal_ours_for_output (); | |
5754 | observer_notify_signal_received (ecs->event_thread->suspend.stop_signal); | |
5755 | target_terminal_inferior (); | |
5756 | } | |
488f131b JB |
5757 | |
5758 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 5759 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 5760 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 5761 | |
fb14de7b | 5762 | if (ecs->event_thread->prev_pc == stop_pc |
16c381f0 | 5763 | && ecs->event_thread->control.trap_expected |
8358c15c | 5764 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 | 5765 | { |
372316f1 PA |
5766 | int was_in_line; |
5767 | ||
68f53502 AC |
5768 | /* We were just starting a new sequence, attempting to |
5769 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 5770 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
5771 | of the stepping range so GDB needs to remember to, when |
5772 | the signal handler returns, resume stepping off that | |
5773 | breakpoint. */ | |
5774 | /* To simplify things, "continue" is forced to use the same | |
5775 | code paths as single-step - set a breakpoint at the | |
5776 | signal return address and then, once hit, step off that | |
5777 | breakpoint. */ | |
237fc4c9 PA |
5778 | if (debug_infrun) |
5779 | fprintf_unfiltered (gdb_stdlog, | |
5780 | "infrun: signal arrived while stepping over " | |
5781 | "breakpoint\n"); | |
d3169d93 | 5782 | |
372316f1 PA |
5783 | was_in_line = step_over_info_valid_p (); |
5784 | clear_step_over_info (); | |
2c03e5be | 5785 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 5786 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
5787 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
5788 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc | 5789 | |
fbea99ea | 5790 | if (target_is_non_stop_p ()) |
372316f1 | 5791 | { |
fbea99ea PA |
5792 | /* Either "set non-stop" is "on", or the target is |
5793 | always in non-stop mode. In this case, we have a bit | |
5794 | more work to do. Resume the current thread, and if | |
5795 | we had paused all threads, restart them while the | |
5796 | signal handler runs. */ | |
372316f1 PA |
5797 | keep_going (ecs); |
5798 | ||
372316f1 PA |
5799 | if (was_in_line) |
5800 | { | |
372316f1 PA |
5801 | restart_threads (ecs->event_thread); |
5802 | } | |
5803 | else if (debug_infrun) | |
5804 | { | |
5805 | fprintf_unfiltered (gdb_stdlog, | |
5806 | "infrun: no need to restart threads\n"); | |
5807 | } | |
5808 | return; | |
5809 | } | |
5810 | ||
d137e6dc PA |
5811 | /* If we were nexting/stepping some other thread, switch to |
5812 | it, so that we don't continue it, losing control. */ | |
5813 | if (!switch_back_to_stepped_thread (ecs)) | |
5814 | keep_going (ecs); | |
9d799f85 | 5815 | return; |
68f53502 | 5816 | } |
9d799f85 | 5817 | |
e5f8a7cc PA |
5818 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
5819 | && (pc_in_thread_step_range (stop_pc, ecs->event_thread) | |
5820 | || ecs->event_thread->control.step_range_end == 1) | |
edb3359d | 5821 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 5822 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 5823 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
5824 | { |
5825 | /* The inferior is about to take a signal that will take it | |
5826 | out of the single step range. Set a breakpoint at the | |
5827 | current PC (which is presumably where the signal handler | |
5828 | will eventually return) and then allow the inferior to | |
5829 | run free. | |
5830 | ||
5831 | Note that this is only needed for a signal delivered | |
5832 | while in the single-step range. Nested signals aren't a | |
5833 | problem as they eventually all return. */ | |
237fc4c9 PA |
5834 | if (debug_infrun) |
5835 | fprintf_unfiltered (gdb_stdlog, | |
5836 | "infrun: signal may take us out of " | |
5837 | "single-step range\n"); | |
5838 | ||
372316f1 | 5839 | clear_step_over_info (); |
2c03e5be | 5840 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 5841 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
5842 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
5843 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
5844 | keep_going (ecs); |
5845 | return; | |
d303a6c7 | 5846 | } |
9d799f85 AC |
5847 | |
5848 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
5849 | when either there's a nested signal, or when there's a | |
5850 | pending signal enabled just as the signal handler returns | |
5851 | (leaving the inferior at the step-resume-breakpoint without | |
5852 | actually executing it). Either way continue until the | |
5853 | breakpoint is really hit. */ | |
c447ac0b PA |
5854 | |
5855 | if (!switch_back_to_stepped_thread (ecs)) | |
5856 | { | |
5857 | if (debug_infrun) | |
5858 | fprintf_unfiltered (gdb_stdlog, | |
5859 | "infrun: random signal, keep going\n"); | |
5860 | ||
5861 | keep_going (ecs); | |
5862 | } | |
5863 | return; | |
488f131b | 5864 | } |
94c57d6a PA |
5865 | |
5866 | process_event_stop_test (ecs); | |
5867 | } | |
5868 | ||
5869 | /* Come here when we've got some debug event / signal we can explain | |
5870 | (IOW, not a random signal), and test whether it should cause a | |
5871 | stop, or whether we should resume the inferior (transparently). | |
5872 | E.g., could be a breakpoint whose condition evaluates false; we | |
5873 | could be still stepping within the line; etc. */ | |
5874 | ||
5875 | static void | |
5876 | process_event_stop_test (struct execution_control_state *ecs) | |
5877 | { | |
5878 | struct symtab_and_line stop_pc_sal; | |
5879 | struct frame_info *frame; | |
5880 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
5881 | CORE_ADDR jmp_buf_pc; |
5882 | struct bpstat_what what; | |
94c57d6a | 5883 | |
cdaa5b73 | 5884 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 5885 | |
cdaa5b73 PA |
5886 | frame = get_current_frame (); |
5887 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 5888 | |
cdaa5b73 | 5889 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 5890 | |
cdaa5b73 PA |
5891 | if (what.call_dummy) |
5892 | { | |
5893 | stop_stack_dummy = what.call_dummy; | |
5894 | } | |
186c406b | 5895 | |
cdaa5b73 PA |
5896 | /* If we hit an internal event that triggers symbol changes, the |
5897 | current frame will be invalidated within bpstat_what (e.g., if we | |
5898 | hit an internal solib event). Re-fetch it. */ | |
5899 | frame = get_current_frame (); | |
5900 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 5901 | |
cdaa5b73 PA |
5902 | switch (what.main_action) |
5903 | { | |
5904 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
5905 | /* If we hit the breakpoint at longjmp while stepping, we | |
5906 | install a momentary breakpoint at the target of the | |
5907 | jmp_buf. */ | |
186c406b | 5908 | |
cdaa5b73 PA |
5909 | if (debug_infrun) |
5910 | fprintf_unfiltered (gdb_stdlog, | |
5911 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 5912 | |
cdaa5b73 | 5913 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 5914 | |
cdaa5b73 PA |
5915 | if (what.is_longjmp) |
5916 | { | |
5917 | struct value *arg_value; | |
5918 | ||
5919 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
5920 | then use it to extract the arguments. The destination PC | |
5921 | is the third argument to the probe. */ | |
5922 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
5923 | if (arg_value) | |
8fa0c4f8 AA |
5924 | { |
5925 | jmp_buf_pc = value_as_address (arg_value); | |
5926 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
5927 | } | |
cdaa5b73 PA |
5928 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
5929 | || !gdbarch_get_longjmp_target (gdbarch, | |
5930 | frame, &jmp_buf_pc)) | |
e2e4d78b | 5931 | { |
cdaa5b73 PA |
5932 | if (debug_infrun) |
5933 | fprintf_unfiltered (gdb_stdlog, | |
5934 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
5935 | "(!gdbarch_get_longjmp_target)\n"); | |
5936 | keep_going (ecs); | |
5937 | return; | |
e2e4d78b | 5938 | } |
e2e4d78b | 5939 | |
cdaa5b73 PA |
5940 | /* Insert a breakpoint at resume address. */ |
5941 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
5942 | } | |
5943 | else | |
5944 | check_exception_resume (ecs, frame); | |
5945 | keep_going (ecs); | |
5946 | return; | |
e81a37f7 | 5947 | |
cdaa5b73 PA |
5948 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
5949 | { | |
5950 | struct frame_info *init_frame; | |
e81a37f7 | 5951 | |
cdaa5b73 | 5952 | /* There are several cases to consider. |
c906108c | 5953 | |
cdaa5b73 PA |
5954 | 1. The initiating frame no longer exists. In this case we |
5955 | must stop, because the exception or longjmp has gone too | |
5956 | far. | |
2c03e5be | 5957 | |
cdaa5b73 PA |
5958 | 2. The initiating frame exists, and is the same as the |
5959 | current frame. We stop, because the exception or longjmp | |
5960 | has been caught. | |
2c03e5be | 5961 | |
cdaa5b73 PA |
5962 | 3. The initiating frame exists and is different from the |
5963 | current frame. This means the exception or longjmp has | |
5964 | been caught beneath the initiating frame, so keep going. | |
c906108c | 5965 | |
cdaa5b73 PA |
5966 | 4. longjmp breakpoint has been placed just to protect |
5967 | against stale dummy frames and user is not interested in | |
5968 | stopping around longjmps. */ | |
c5aa993b | 5969 | |
cdaa5b73 PA |
5970 | if (debug_infrun) |
5971 | fprintf_unfiltered (gdb_stdlog, | |
5972 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 5973 | |
cdaa5b73 PA |
5974 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
5975 | != NULL); | |
5976 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 5977 | |
cdaa5b73 PA |
5978 | if (what.is_longjmp) |
5979 | { | |
b67a2c6f | 5980 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 5981 | |
cdaa5b73 | 5982 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 5983 | { |
cdaa5b73 PA |
5984 | /* Case 4. */ |
5985 | keep_going (ecs); | |
5986 | return; | |
e5ef252a | 5987 | } |
cdaa5b73 | 5988 | } |
c5aa993b | 5989 | |
cdaa5b73 | 5990 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 5991 | |
cdaa5b73 PA |
5992 | if (init_frame) |
5993 | { | |
5994 | struct frame_id current_id | |
5995 | = get_frame_id (get_current_frame ()); | |
5996 | if (frame_id_eq (current_id, | |
5997 | ecs->event_thread->initiating_frame)) | |
5998 | { | |
5999 | /* Case 2. Fall through. */ | |
6000 | } | |
6001 | else | |
6002 | { | |
6003 | /* Case 3. */ | |
6004 | keep_going (ecs); | |
6005 | return; | |
6006 | } | |
68f53502 | 6007 | } |
488f131b | 6008 | |
cdaa5b73 PA |
6009 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6010 | exists. */ | |
6011 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6012 | |
bdc36728 | 6013 | end_stepping_range (ecs); |
cdaa5b73 PA |
6014 | } |
6015 | return; | |
e5ef252a | 6016 | |
cdaa5b73 PA |
6017 | case BPSTAT_WHAT_SINGLE: |
6018 | if (debug_infrun) | |
6019 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
6020 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6021 | /* Still need to check other stuff, at least the case where we | |
6022 | are stepping and step out of the right range. */ | |
6023 | break; | |
e5ef252a | 6024 | |
cdaa5b73 PA |
6025 | case BPSTAT_WHAT_STEP_RESUME: |
6026 | if (debug_infrun) | |
6027 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 6028 | |
cdaa5b73 PA |
6029 | delete_step_resume_breakpoint (ecs->event_thread); |
6030 | if (ecs->event_thread->control.proceed_to_finish | |
6031 | && execution_direction == EXEC_REVERSE) | |
6032 | { | |
6033 | struct thread_info *tp = ecs->event_thread; | |
6034 | ||
6035 | /* We are finishing a function in reverse, and just hit the | |
6036 | step-resume breakpoint at the start address of the | |
6037 | function, and we're almost there -- just need to back up | |
6038 | by one more single-step, which should take us back to the | |
6039 | function call. */ | |
6040 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6041 | keep_going (ecs); | |
e5ef252a | 6042 | return; |
cdaa5b73 PA |
6043 | } |
6044 | fill_in_stop_func (gdbarch, ecs); | |
6045 | if (stop_pc == ecs->stop_func_start | |
6046 | && execution_direction == EXEC_REVERSE) | |
6047 | { | |
6048 | /* We are stepping over a function call in reverse, and just | |
6049 | hit the step-resume breakpoint at the start address of | |
6050 | the function. Go back to single-stepping, which should | |
6051 | take us back to the function call. */ | |
6052 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6053 | keep_going (ecs); | |
6054 | return; | |
6055 | } | |
6056 | break; | |
e5ef252a | 6057 | |
cdaa5b73 PA |
6058 | case BPSTAT_WHAT_STOP_NOISY: |
6059 | if (debug_infrun) | |
6060 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
6061 | stop_print_frame = 1; | |
e5ef252a | 6062 | |
99619bea PA |
6063 | /* Assume the thread stopped for a breapoint. We'll still check |
6064 | whether a/the breakpoint is there when the thread is next | |
6065 | resumed. */ | |
6066 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6067 | |
22bcd14b | 6068 | stop_waiting (ecs); |
cdaa5b73 | 6069 | return; |
e5ef252a | 6070 | |
cdaa5b73 PA |
6071 | case BPSTAT_WHAT_STOP_SILENT: |
6072 | if (debug_infrun) | |
6073 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
6074 | stop_print_frame = 0; | |
e5ef252a | 6075 | |
99619bea PA |
6076 | /* Assume the thread stopped for a breapoint. We'll still check |
6077 | whether a/the breakpoint is there when the thread is next | |
6078 | resumed. */ | |
6079 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6080 | stop_waiting (ecs); |
cdaa5b73 PA |
6081 | return; |
6082 | ||
6083 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
6084 | if (debug_infrun) | |
6085 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
6086 | ||
6087 | delete_step_resume_breakpoint (ecs->event_thread); | |
6088 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6089 | { | |
6090 | /* Back when the step-resume breakpoint was inserted, we | |
6091 | were trying to single-step off a breakpoint. Go back to | |
6092 | doing that. */ | |
6093 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6094 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6095 | keep_going (ecs); | |
6096 | return; | |
e5ef252a | 6097 | } |
cdaa5b73 PA |
6098 | break; |
6099 | ||
6100 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6101 | break; | |
e5ef252a | 6102 | } |
c906108c | 6103 | |
af48d08f PA |
6104 | /* If we stepped a permanent breakpoint and we had a high priority |
6105 | step-resume breakpoint for the address we stepped, but we didn't | |
6106 | hit it, then we must have stepped into the signal handler. The | |
6107 | step-resume was only necessary to catch the case of _not_ | |
6108 | stepping into the handler, so delete it, and fall through to | |
6109 | checking whether the step finished. */ | |
6110 | if (ecs->event_thread->stepped_breakpoint) | |
6111 | { | |
6112 | struct breakpoint *sr_bp | |
6113 | = ecs->event_thread->control.step_resume_breakpoint; | |
6114 | ||
8d707a12 PA |
6115 | if (sr_bp != NULL |
6116 | && sr_bp->loc->permanent | |
af48d08f PA |
6117 | && sr_bp->type == bp_hp_step_resume |
6118 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6119 | { | |
6120 | if (debug_infrun) | |
6121 | fprintf_unfiltered (gdb_stdlog, | |
6122 | "infrun: stepped permanent breakpoint, stopped in " | |
6123 | "handler\n"); | |
6124 | delete_step_resume_breakpoint (ecs->event_thread); | |
6125 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6126 | } | |
6127 | } | |
6128 | ||
cdaa5b73 PA |
6129 | /* We come here if we hit a breakpoint but should not stop for it. |
6130 | Possibly we also were stepping and should stop for that. So fall | |
6131 | through and test for stepping. But, if not stepping, do not | |
6132 | stop. */ | |
c906108c | 6133 | |
a7212384 UW |
6134 | /* In all-stop mode, if we're currently stepping but have stopped in |
6135 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6136 | if (switch_back_to_stepped_thread (ecs)) |
6137 | return; | |
776f04fa | 6138 | |
8358c15c | 6139 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6140 | { |
527159b7 | 6141 | if (debug_infrun) |
d3169d93 DJ |
6142 | fprintf_unfiltered (gdb_stdlog, |
6143 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 6144 | |
488f131b JB |
6145 | /* Having a step-resume breakpoint overrides anything |
6146 | else having to do with stepping commands until | |
6147 | that breakpoint is reached. */ | |
488f131b JB |
6148 | keep_going (ecs); |
6149 | return; | |
6150 | } | |
c5aa993b | 6151 | |
16c381f0 | 6152 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6153 | { |
527159b7 | 6154 | if (debug_infrun) |
8a9de0e4 | 6155 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 6156 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6157 | keep_going (ecs); |
6158 | return; | |
6159 | } | |
c5aa993b | 6160 | |
4b7703ad JB |
6161 | /* Re-fetch current thread's frame in case the code above caused |
6162 | the frame cache to be re-initialized, making our FRAME variable | |
6163 | a dangling pointer. */ | |
6164 | frame = get_current_frame (); | |
628fe4e4 | 6165 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6166 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6167 | |
488f131b | 6168 | /* If stepping through a line, keep going if still within it. |
c906108c | 6169 | |
488f131b JB |
6170 | Note that step_range_end is the address of the first instruction |
6171 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6172 | within it! |
6173 | ||
6174 | Note also that during reverse execution, we may be stepping | |
6175 | through a function epilogue and therefore must detect when | |
6176 | the current-frame changes in the middle of a line. */ | |
6177 | ||
ce4c476a | 6178 | if (pc_in_thread_step_range (stop_pc, ecs->event_thread) |
31410e84 | 6179 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6180 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6181 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6182 | { |
527159b7 | 6183 | if (debug_infrun) |
5af949e3 UW |
6184 | fprintf_unfiltered |
6185 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
6186 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
6187 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6188 | |
c1e36e3e PA |
6189 | /* Tentatively re-enable range stepping; `resume' disables it if |
6190 | necessary (e.g., if we're stepping over a breakpoint or we | |
6191 | have software watchpoints). */ | |
6192 | ecs->event_thread->control.may_range_step = 1; | |
6193 | ||
b2175913 MS |
6194 | /* When stepping backward, stop at beginning of line range |
6195 | (unless it's the function entry point, in which case | |
6196 | keep going back to the call point). */ | |
16c381f0 | 6197 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6198 | && stop_pc != ecs->stop_func_start |
6199 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6200 | end_stepping_range (ecs); |
b2175913 MS |
6201 | else |
6202 | keep_going (ecs); | |
6203 | ||
488f131b JB |
6204 | return; |
6205 | } | |
c5aa993b | 6206 | |
488f131b | 6207 | /* We stepped out of the stepping range. */ |
c906108c | 6208 | |
488f131b | 6209 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6210 | loader dynamic symbol resolution code... |
6211 | ||
6212 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6213 | time loader code and reach the callee's address. | |
6214 | ||
6215 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6216 | the runtime loader code is handled just like any other | |
6217 | undebuggable function call. Now we need only keep stepping | |
6218 | backward through the trampoline code, and that's handled further | |
6219 | down, so there is nothing for us to do here. */ | |
6220 | ||
6221 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6222 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
cfd8ab24 | 6223 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 6224 | { |
4c8c40e6 | 6225 | CORE_ADDR pc_after_resolver = |
568d6575 | 6226 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); |
c906108c | 6227 | |
527159b7 | 6228 | if (debug_infrun) |
3e43a32a MS |
6229 | fprintf_unfiltered (gdb_stdlog, |
6230 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 6231 | |
488f131b JB |
6232 | if (pc_after_resolver) |
6233 | { | |
6234 | /* Set up a step-resume breakpoint at the address | |
6235 | indicated by SKIP_SOLIB_RESOLVER. */ | |
6236 | struct symtab_and_line sr_sal; | |
abbb1732 | 6237 | |
fe39c653 | 6238 | init_sal (&sr_sal); |
488f131b | 6239 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6240 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6241 | |
a6d9a66e UW |
6242 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6243 | sr_sal, null_frame_id); | |
c5aa993b | 6244 | } |
c906108c | 6245 | |
488f131b JB |
6246 | keep_going (ecs); |
6247 | return; | |
6248 | } | |
c906108c | 6249 | |
16c381f0 JK |
6250 | if (ecs->event_thread->control.step_range_end != 1 |
6251 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6252 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6253 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6254 | { |
527159b7 | 6255 | if (debug_infrun) |
3e43a32a MS |
6256 | fprintf_unfiltered (gdb_stdlog, |
6257 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 6258 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6259 | a signal trampoline (either by a signal being delivered or by |
6260 | the signal handler returning). Just single-step until the | |
6261 | inferior leaves the trampoline (either by calling the handler | |
6262 | or returning). */ | |
488f131b JB |
6263 | keep_going (ecs); |
6264 | return; | |
6265 | } | |
c906108c | 6266 | |
14132e89 MR |
6267 | /* If we're in the return path from a shared library trampoline, |
6268 | we want to proceed through the trampoline when stepping. */ | |
6269 | /* macro/2012-04-25: This needs to come before the subroutine | |
6270 | call check below as on some targets return trampolines look | |
6271 | like subroutine calls (MIPS16 return thunks). */ | |
6272 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
6273 | stop_pc, ecs->stop_func_name) | |
6274 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) | |
6275 | { | |
6276 | /* Determine where this trampoline returns. */ | |
6277 | CORE_ADDR real_stop_pc; | |
6278 | ||
6279 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
6280 | ||
6281 | if (debug_infrun) | |
6282 | fprintf_unfiltered (gdb_stdlog, | |
6283 | "infrun: stepped into solib return tramp\n"); | |
6284 | ||
6285 | /* Only proceed through if we know where it's going. */ | |
6286 | if (real_stop_pc) | |
6287 | { | |
6288 | /* And put the step-breakpoint there and go until there. */ | |
6289 | struct symtab_and_line sr_sal; | |
6290 | ||
6291 | init_sal (&sr_sal); /* initialize to zeroes */ | |
6292 | sr_sal.pc = real_stop_pc; | |
6293 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6294 | sr_sal.pspace = get_frame_program_space (frame); | |
6295 | ||
6296 | /* Do not specify what the fp should be when we stop since | |
6297 | on some machines the prologue is where the new fp value | |
6298 | is established. */ | |
6299 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6300 | sr_sal, null_frame_id); | |
6301 | ||
6302 | /* Restart without fiddling with the step ranges or | |
6303 | other state. */ | |
6304 | keep_going (ecs); | |
6305 | return; | |
6306 | } | |
6307 | } | |
6308 | ||
c17eaafe DJ |
6309 | /* Check for subroutine calls. The check for the current frame |
6310 | equalling the step ID is not necessary - the check of the | |
6311 | previous frame's ID is sufficient - but it is a common case and | |
6312 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6313 | |
6314 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6315 | being equal, so to get into this block, both the current and | |
6316 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6317 | /* The outer_frame_id check is a heuristic to detect stepping |
6318 | through startup code. If we step over an instruction which | |
6319 | sets the stack pointer from an invalid value to a valid value, | |
6320 | we may detect that as a subroutine call from the mythical | |
6321 | "outermost" function. This could be fixed by marking | |
6322 | outermost frames as !stack_p,code_p,special_p. Then the | |
6323 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6324 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6325 | for more. */ |
edb3359d | 6326 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6327 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6328 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6329 | ecs->event_thread->control.step_stack_frame_id) |
6330 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6331 | outer_frame_id) |
885eeb5b PA |
6332 | || (ecs->event_thread->control.step_start_function |
6333 | != find_pc_function (stop_pc))))) | |
488f131b | 6334 | { |
95918acb | 6335 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6336 | |
527159b7 | 6337 | if (debug_infrun) |
8a9de0e4 | 6338 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 6339 | |
b7a084be | 6340 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6341 | { |
6342 | /* I presume that step_over_calls is only 0 when we're | |
6343 | supposed to be stepping at the assembly language level | |
6344 | ("stepi"). Just stop. */ | |
388a8562 | 6345 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6346 | end_stepping_range (ecs); |
95918acb AC |
6347 | return; |
6348 | } | |
8fb3e588 | 6349 | |
388a8562 MS |
6350 | /* Reverse stepping through solib trampolines. */ |
6351 | ||
6352 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6353 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6354 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6355 | || (ecs->stop_func_start == 0 | |
6356 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6357 | { | |
6358 | /* Any solib trampoline code can be handled in reverse | |
6359 | by simply continuing to single-step. We have already | |
6360 | executed the solib function (backwards), and a few | |
6361 | steps will take us back through the trampoline to the | |
6362 | caller. */ | |
6363 | keep_going (ecs); | |
6364 | return; | |
6365 | } | |
6366 | ||
16c381f0 | 6367 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6368 | { |
b2175913 MS |
6369 | /* We're doing a "next". |
6370 | ||
6371 | Normal (forward) execution: set a breakpoint at the | |
6372 | callee's return address (the address at which the caller | |
6373 | will resume). | |
6374 | ||
6375 | Reverse (backward) execution. set the step-resume | |
6376 | breakpoint at the start of the function that we just | |
6377 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6378 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6379 | |
6380 | if (execution_direction == EXEC_REVERSE) | |
6381 | { | |
acf9414f JK |
6382 | /* If we're already at the start of the function, we've either |
6383 | just stepped backward into a single instruction function, | |
6384 | or stepped back out of a signal handler to the first instruction | |
6385 | of the function. Just keep going, which will single-step back | |
6386 | to the caller. */ | |
58c48e72 | 6387 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f JK |
6388 | { |
6389 | struct symtab_and_line sr_sal; | |
6390 | ||
6391 | /* Normal function call return (static or dynamic). */ | |
6392 | init_sal (&sr_sal); | |
6393 | sr_sal.pc = ecs->stop_func_start; | |
6394 | sr_sal.pspace = get_frame_program_space (frame); | |
6395 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6396 | sr_sal, null_frame_id); | |
6397 | } | |
b2175913 MS |
6398 | } |
6399 | else | |
568d6575 | 6400 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6401 | |
8567c30f AC |
6402 | keep_going (ecs); |
6403 | return; | |
6404 | } | |
a53c66de | 6405 | |
95918acb | 6406 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6407 | calling routine and the real function), locate the real |
6408 | function. That's what tells us (a) whether we want to step | |
6409 | into it at all, and (b) what prologue we want to run to the | |
6410 | end of, if we do step into it. */ | |
568d6575 | 6411 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6412 | if (real_stop_pc == 0) |
568d6575 | 6413 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6414 | if (real_stop_pc != 0) |
6415 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6416 | |
db5f024e | 6417 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 RC |
6418 | { |
6419 | struct symtab_and_line sr_sal; | |
abbb1732 | 6420 | |
1b2bfbb9 RC |
6421 | init_sal (&sr_sal); |
6422 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 6423 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6424 | |
a6d9a66e UW |
6425 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6426 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6427 | keep_going (ecs); |
6428 | return; | |
1b2bfbb9 RC |
6429 | } |
6430 | ||
95918acb | 6431 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6432 | thinking of stepping into and the function isn't on the skip |
6433 | list, step into it. | |
95918acb | 6434 | |
8fb3e588 AC |
6435 | If there are several symtabs at that PC (e.g. with include |
6436 | files), just want to know whether *any* of them have line | |
6437 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6438 | { |
6439 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6440 | |
95918acb | 6441 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6442 | if (tmp_sal.line != 0 |
85817405 JK |
6443 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
6444 | &tmp_sal)) | |
95918acb | 6445 | { |
b2175913 | 6446 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6447 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6448 | else |
568d6575 | 6449 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6450 | return; |
6451 | } | |
6452 | } | |
6453 | ||
6454 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6455 | set, we stop the step so that the user has a chance to switch |
6456 | in assembly mode. */ | |
16c381f0 | 6457 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6458 | && step_stop_if_no_debug) |
95918acb | 6459 | { |
bdc36728 | 6460 | end_stepping_range (ecs); |
95918acb AC |
6461 | return; |
6462 | } | |
6463 | ||
b2175913 MS |
6464 | if (execution_direction == EXEC_REVERSE) |
6465 | { | |
acf9414f JK |
6466 | /* If we're already at the start of the function, we've either just |
6467 | stepped backward into a single instruction function without line | |
6468 | number info, or stepped back out of a signal handler to the first | |
6469 | instruction of the function without line number info. Just keep | |
6470 | going, which will single-step back to the caller. */ | |
6471 | if (ecs->stop_func_start != stop_pc) | |
6472 | { | |
6473 | /* Set a breakpoint at callee's start address. | |
6474 | From there we can step once and be back in the caller. */ | |
6475 | struct symtab_and_line sr_sal; | |
abbb1732 | 6476 | |
acf9414f JK |
6477 | init_sal (&sr_sal); |
6478 | sr_sal.pc = ecs->stop_func_start; | |
6479 | sr_sal.pspace = get_frame_program_space (frame); | |
6480 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6481 | sr_sal, null_frame_id); | |
6482 | } | |
b2175913 MS |
6483 | } |
6484 | else | |
6485 | /* Set a breakpoint at callee's return address (the address | |
6486 | at which the caller will resume). */ | |
568d6575 | 6487 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6488 | |
95918acb | 6489 | keep_going (ecs); |
488f131b | 6490 | return; |
488f131b | 6491 | } |
c906108c | 6492 | |
fdd654f3 MS |
6493 | /* Reverse stepping through solib trampolines. */ |
6494 | ||
6495 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6496 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 MS |
6497 | { |
6498 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
6499 | || (ecs->stop_func_start == 0 | |
6500 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6501 | { | |
6502 | /* Any solib trampoline code can be handled in reverse | |
6503 | by simply continuing to single-step. We have already | |
6504 | executed the solib function (backwards), and a few | |
6505 | steps will take us back through the trampoline to the | |
6506 | caller. */ | |
6507 | keep_going (ecs); | |
6508 | return; | |
6509 | } | |
6510 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6511 | { | |
6512 | /* Stepped backward into the solib dynsym resolver. | |
6513 | Set a breakpoint at its start and continue, then | |
6514 | one more step will take us out. */ | |
6515 | struct symtab_and_line sr_sal; | |
abbb1732 | 6516 | |
fdd654f3 MS |
6517 | init_sal (&sr_sal); |
6518 | sr_sal.pc = ecs->stop_func_start; | |
9d1807c3 | 6519 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6520 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6521 | sr_sal, null_frame_id); | |
6522 | keep_going (ecs); | |
6523 | return; | |
6524 | } | |
6525 | } | |
6526 | ||
2afb61aa | 6527 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 6528 | |
1b2bfbb9 RC |
6529 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6530 | the trampoline processing logic, however, there are some trampolines | |
6531 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6532 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6533 | && ecs->stop_func_name == NULL |
2afb61aa | 6534 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6535 | { |
527159b7 | 6536 | if (debug_infrun) |
3e43a32a MS |
6537 | fprintf_unfiltered (gdb_stdlog, |
6538 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 6539 | |
1b2bfbb9 | 6540 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6541 | undebuggable function (where there is no debugging information |
6542 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6543 | inferior stopped). Since we want to skip this kind of code, |
6544 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6545 | function - unless the user has asked us not to (via |
6546 | set step-mode) or we no longer know how to get back | |
6547 | to the call site. */ | |
6548 | if (step_stop_if_no_debug | |
c7ce8faa | 6549 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6550 | { |
6551 | /* If we have no line number and the step-stop-if-no-debug | |
6552 | is set, we stop the step so that the user has a chance to | |
6553 | switch in assembly mode. */ | |
bdc36728 | 6554 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6555 | return; |
6556 | } | |
6557 | else | |
6558 | { | |
6559 | /* Set a breakpoint at callee's return address (the address | |
6560 | at which the caller will resume). */ | |
568d6575 | 6561 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6562 | keep_going (ecs); |
6563 | return; | |
6564 | } | |
6565 | } | |
6566 | ||
16c381f0 | 6567 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6568 | { |
6569 | /* It is stepi or nexti. We always want to stop stepping after | |
6570 | one instruction. */ | |
527159b7 | 6571 | if (debug_infrun) |
8a9de0e4 | 6572 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 6573 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6574 | return; |
6575 | } | |
6576 | ||
2afb61aa | 6577 | if (stop_pc_sal.line == 0) |
488f131b JB |
6578 | { |
6579 | /* We have no line number information. That means to stop | |
6580 | stepping (does this always happen right after one instruction, | |
6581 | when we do "s" in a function with no line numbers, | |
6582 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 6583 | if (debug_infrun) |
8a9de0e4 | 6584 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 6585 | end_stepping_range (ecs); |
488f131b JB |
6586 | return; |
6587 | } | |
c906108c | 6588 | |
edb3359d DJ |
6589 | /* Look for "calls" to inlined functions, part one. If the inline |
6590 | frame machinery detected some skipped call sites, we have entered | |
6591 | a new inline function. */ | |
6592 | ||
6593 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6594 | ecs->event_thread->control.step_frame_id) |
edb3359d DJ |
6595 | && inline_skipped_frames (ecs->ptid)) |
6596 | { | |
6597 | struct symtab_and_line call_sal; | |
6598 | ||
6599 | if (debug_infrun) | |
6600 | fprintf_unfiltered (gdb_stdlog, | |
6601 | "infrun: stepped into inlined function\n"); | |
6602 | ||
6603 | find_frame_sal (get_current_frame (), &call_sal); | |
6604 | ||
16c381f0 | 6605 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
6606 | { |
6607 | /* For "step", we're going to stop. But if the call site | |
6608 | for this inlined function is on the same source line as | |
6609 | we were previously stepping, go down into the function | |
6610 | first. Otherwise stop at the call site. */ | |
6611 | ||
6612 | if (call_sal.line == ecs->event_thread->current_line | |
6613 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6614 | step_into_inline_frame (ecs->ptid); | |
6615 | ||
bdc36728 | 6616 | end_stepping_range (ecs); |
edb3359d DJ |
6617 | return; |
6618 | } | |
6619 | else | |
6620 | { | |
6621 | /* For "next", we should stop at the call site if it is on a | |
6622 | different source line. Otherwise continue through the | |
6623 | inlined function. */ | |
6624 | if (call_sal.line == ecs->event_thread->current_line | |
6625 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6626 | keep_going (ecs); | |
6627 | else | |
bdc36728 | 6628 | end_stepping_range (ecs); |
edb3359d DJ |
6629 | return; |
6630 | } | |
6631 | } | |
6632 | ||
6633 | /* Look for "calls" to inlined functions, part two. If we are still | |
6634 | in the same real function we were stepping through, but we have | |
6635 | to go further up to find the exact frame ID, we are stepping | |
6636 | through a more inlined call beyond its call site. */ | |
6637 | ||
6638 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
6639 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6640 | ecs->event_thread->control.step_frame_id) |
edb3359d | 6641 | && stepped_in_from (get_current_frame (), |
16c381f0 | 6642 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
6643 | { |
6644 | if (debug_infrun) | |
6645 | fprintf_unfiltered (gdb_stdlog, | |
6646 | "infrun: stepping through inlined function\n"); | |
6647 | ||
16c381f0 | 6648 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
6649 | keep_going (ecs); |
6650 | else | |
bdc36728 | 6651 | end_stepping_range (ecs); |
edb3359d DJ |
6652 | return; |
6653 | } | |
6654 | ||
2afb61aa | 6655 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
6656 | && (ecs->event_thread->current_line != stop_pc_sal.line |
6657 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
6658 | { |
6659 | /* We are at the start of a different line. So stop. Note that | |
6660 | we don't stop if we step into the middle of a different line. | |
6661 | That is said to make things like for (;;) statements work | |
6662 | better. */ | |
527159b7 | 6663 | if (debug_infrun) |
3e43a32a MS |
6664 | fprintf_unfiltered (gdb_stdlog, |
6665 | "infrun: stepped to a different line\n"); | |
bdc36728 | 6666 | end_stepping_range (ecs); |
488f131b JB |
6667 | return; |
6668 | } | |
c906108c | 6669 | |
488f131b | 6670 | /* We aren't done stepping. |
c906108c | 6671 | |
488f131b JB |
6672 | Optimize by setting the stepping range to the line. |
6673 | (We might not be in the original line, but if we entered a | |
6674 | new line in mid-statement, we continue stepping. This makes | |
6675 | things like for(;;) statements work better.) */ | |
c906108c | 6676 | |
16c381f0 JK |
6677 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
6678 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 6679 | ecs->event_thread->control.may_range_step = 1; |
edb3359d | 6680 | set_step_info (frame, stop_pc_sal); |
488f131b | 6681 | |
527159b7 | 6682 | if (debug_infrun) |
8a9de0e4 | 6683 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 6684 | keep_going (ecs); |
104c1213 JM |
6685 | } |
6686 | ||
c447ac0b PA |
6687 | /* In all-stop mode, if we're currently stepping but have stopped in |
6688 | some other thread, we may need to switch back to the stepped | |
6689 | thread. Returns true we set the inferior running, false if we left | |
6690 | it stopped (and the event needs further processing). */ | |
6691 | ||
6692 | static int | |
6693 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
6694 | { | |
fbea99ea | 6695 | if (!target_is_non_stop_p ()) |
c447ac0b PA |
6696 | { |
6697 | struct thread_info *tp; | |
99619bea PA |
6698 | struct thread_info *stepping_thread; |
6699 | ||
6700 | /* If any thread is blocked on some internal breakpoint, and we | |
6701 | simply need to step over that breakpoint to get it going | |
6702 | again, do that first. */ | |
6703 | ||
6704 | /* However, if we see an event for the stepping thread, then we | |
6705 | know all other threads have been moved past their breakpoints | |
6706 | already. Let the caller check whether the step is finished, | |
6707 | etc., before deciding to move it past a breakpoint. */ | |
6708 | if (ecs->event_thread->control.step_range_end != 0) | |
6709 | return 0; | |
6710 | ||
6711 | /* Check if the current thread is blocked on an incomplete | |
6712 | step-over, interrupted by a random signal. */ | |
6713 | if (ecs->event_thread->control.trap_expected | |
6714 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 6715 | { |
99619bea PA |
6716 | if (debug_infrun) |
6717 | { | |
6718 | fprintf_unfiltered (gdb_stdlog, | |
6719 | "infrun: need to finish step-over of [%s]\n", | |
6720 | target_pid_to_str (ecs->event_thread->ptid)); | |
6721 | } | |
6722 | keep_going (ecs); | |
6723 | return 1; | |
6724 | } | |
2adfaa28 | 6725 | |
99619bea PA |
6726 | /* Check if the current thread is blocked by a single-step |
6727 | breakpoint of another thread. */ | |
6728 | if (ecs->hit_singlestep_breakpoint) | |
6729 | { | |
6730 | if (debug_infrun) | |
6731 | { | |
6732 | fprintf_unfiltered (gdb_stdlog, | |
6733 | "infrun: need to step [%s] over single-step " | |
6734 | "breakpoint\n", | |
6735 | target_pid_to_str (ecs->ptid)); | |
6736 | } | |
6737 | keep_going (ecs); | |
6738 | return 1; | |
6739 | } | |
6740 | ||
4d9d9d04 PA |
6741 | /* If this thread needs yet another step-over (e.g., stepping |
6742 | through a delay slot), do it first before moving on to | |
6743 | another thread. */ | |
6744 | if (thread_still_needs_step_over (ecs->event_thread)) | |
6745 | { | |
6746 | if (debug_infrun) | |
6747 | { | |
6748 | fprintf_unfiltered (gdb_stdlog, | |
6749 | "infrun: thread [%s] still needs step-over\n", | |
6750 | target_pid_to_str (ecs->event_thread->ptid)); | |
6751 | } | |
6752 | keep_going (ecs); | |
6753 | return 1; | |
6754 | } | |
70509625 | 6755 | |
483805cf PA |
6756 | /* If scheduler locking applies even if not stepping, there's no |
6757 | need to walk over threads. Above we've checked whether the | |
6758 | current thread is stepping. If some other thread not the | |
6759 | event thread is stepping, then it must be that scheduler | |
6760 | locking is not in effect. */ | |
856e7dd6 | 6761 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
6762 | return 0; |
6763 | ||
4d9d9d04 PA |
6764 | /* Otherwise, we no longer expect a trap in the current thread. |
6765 | Clear the trap_expected flag before switching back -- this is | |
6766 | what keep_going does as well, if we call it. */ | |
6767 | ecs->event_thread->control.trap_expected = 0; | |
6768 | ||
6769 | /* Likewise, clear the signal if it should not be passed. */ | |
6770 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
6771 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
6772 | ||
6773 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 6774 | step/next/etc. */ |
4d9d9d04 PA |
6775 | if (start_step_over ()) |
6776 | { | |
6777 | prepare_to_wait (ecs); | |
6778 | return 1; | |
6779 | } | |
6780 | ||
6781 | /* Look for the stepping/nexting thread. */ | |
483805cf | 6782 | stepping_thread = NULL; |
4d9d9d04 | 6783 | |
034f788c | 6784 | ALL_NON_EXITED_THREADS (tp) |
483805cf | 6785 | { |
fbea99ea PA |
6786 | /* Ignore threads of processes the caller is not |
6787 | resuming. */ | |
483805cf | 6788 | if (!sched_multi |
1afd5965 | 6789 | && ptid_get_pid (tp->ptid) != ptid_get_pid (ecs->ptid)) |
483805cf PA |
6790 | continue; |
6791 | ||
6792 | /* When stepping over a breakpoint, we lock all threads | |
6793 | except the one that needs to move past the breakpoint. | |
6794 | If a non-event thread has this set, the "incomplete | |
6795 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
6796 | if (tp->control.trap_expected) |
6797 | { | |
6798 | internal_error (__FILE__, __LINE__, | |
6799 | "[%s] has inconsistent state: " | |
6800 | "trap_expected=%d\n", | |
6801 | target_pid_to_str (tp->ptid), | |
6802 | tp->control.trap_expected); | |
6803 | } | |
483805cf PA |
6804 | |
6805 | /* Did we find the stepping thread? */ | |
6806 | if (tp->control.step_range_end) | |
6807 | { | |
6808 | /* Yep. There should only one though. */ | |
6809 | gdb_assert (stepping_thread == NULL); | |
6810 | ||
6811 | /* The event thread is handled at the top, before we | |
6812 | enter this loop. */ | |
6813 | gdb_assert (tp != ecs->event_thread); | |
6814 | ||
6815 | /* If some thread other than the event thread is | |
6816 | stepping, then scheduler locking can't be in effect, | |
6817 | otherwise we wouldn't have resumed the current event | |
6818 | thread in the first place. */ | |
856e7dd6 | 6819 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
6820 | |
6821 | stepping_thread = tp; | |
6822 | } | |
99619bea PA |
6823 | } |
6824 | ||
483805cf | 6825 | if (stepping_thread != NULL) |
99619bea | 6826 | { |
c447ac0b PA |
6827 | if (debug_infrun) |
6828 | fprintf_unfiltered (gdb_stdlog, | |
6829 | "infrun: switching back to stepped thread\n"); | |
6830 | ||
2ac7589c PA |
6831 | if (keep_going_stepped_thread (stepping_thread)) |
6832 | { | |
6833 | prepare_to_wait (ecs); | |
6834 | return 1; | |
6835 | } | |
6836 | } | |
6837 | } | |
2adfaa28 | 6838 | |
2ac7589c PA |
6839 | return 0; |
6840 | } | |
2adfaa28 | 6841 | |
2ac7589c PA |
6842 | /* Set a previously stepped thread back to stepping. Returns true on |
6843 | success, false if the resume is not possible (e.g., the thread | |
6844 | vanished). */ | |
6845 | ||
6846 | static int | |
6847 | keep_going_stepped_thread (struct thread_info *tp) | |
6848 | { | |
6849 | struct frame_info *frame; | |
6850 | struct gdbarch *gdbarch; | |
6851 | struct execution_control_state ecss; | |
6852 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 6853 | |
2ac7589c PA |
6854 | /* If the stepping thread exited, then don't try to switch back and |
6855 | resume it, which could fail in several different ways depending | |
6856 | on the target. Instead, just keep going. | |
2adfaa28 | 6857 | |
2ac7589c PA |
6858 | We can find a stepping dead thread in the thread list in two |
6859 | cases: | |
2adfaa28 | 6860 | |
2ac7589c PA |
6861 | - The target supports thread exit events, and when the target |
6862 | tries to delete the thread from the thread list, inferior_ptid | |
6863 | pointed at the exiting thread. In such case, calling | |
6864 | delete_thread does not really remove the thread from the list; | |
6865 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 6866 | |
2ac7589c PA |
6867 | - The target's debug interface does not support thread exit |
6868 | events, and so we have no idea whatsoever if the previously | |
6869 | stepping thread is still alive. For that reason, we need to | |
6870 | synchronously query the target now. */ | |
2adfaa28 | 6871 | |
2ac7589c PA |
6872 | if (is_exited (tp->ptid) |
6873 | || !target_thread_alive (tp->ptid)) | |
6874 | { | |
6875 | if (debug_infrun) | |
6876 | fprintf_unfiltered (gdb_stdlog, | |
6877 | "infrun: not resuming previously " | |
6878 | "stepped thread, it has vanished\n"); | |
6879 | ||
6880 | delete_thread (tp->ptid); | |
6881 | return 0; | |
c447ac0b | 6882 | } |
2ac7589c PA |
6883 | |
6884 | if (debug_infrun) | |
6885 | fprintf_unfiltered (gdb_stdlog, | |
6886 | "infrun: resuming previously stepped thread\n"); | |
6887 | ||
6888 | reset_ecs (ecs, tp); | |
6889 | switch_to_thread (tp->ptid); | |
6890 | ||
6891 | stop_pc = regcache_read_pc (get_thread_regcache (tp->ptid)); | |
6892 | frame = get_current_frame (); | |
6893 | gdbarch = get_frame_arch (frame); | |
6894 | ||
6895 | /* If the PC of the thread we were trying to single-step has | |
6896 | changed, then that thread has trapped or been signaled, but the | |
6897 | event has not been reported to GDB yet. Re-poll the target | |
6898 | looking for this particular thread's event (i.e. temporarily | |
6899 | enable schedlock) by: | |
6900 | ||
6901 | - setting a break at the current PC | |
6902 | - resuming that particular thread, only (by setting trap | |
6903 | expected) | |
6904 | ||
6905 | This prevents us continuously moving the single-step breakpoint | |
6906 | forward, one instruction at a time, overstepping. */ | |
6907 | ||
6908 | if (stop_pc != tp->prev_pc) | |
6909 | { | |
6910 | ptid_t resume_ptid; | |
6911 | ||
6912 | if (debug_infrun) | |
6913 | fprintf_unfiltered (gdb_stdlog, | |
6914 | "infrun: expected thread advanced also (%s -> %s)\n", | |
6915 | paddress (target_gdbarch (), tp->prev_pc), | |
6916 | paddress (target_gdbarch (), stop_pc)); | |
6917 | ||
6918 | /* Clear the info of the previous step-over, as it's no longer | |
6919 | valid (if the thread was trying to step over a breakpoint, it | |
6920 | has already succeeded). It's what keep_going would do too, | |
6921 | if we called it. Do this before trying to insert the sss | |
6922 | breakpoint, otherwise if we were previously trying to step | |
6923 | over this exact address in another thread, the breakpoint is | |
6924 | skipped. */ | |
6925 | clear_step_over_info (); | |
6926 | tp->control.trap_expected = 0; | |
6927 | ||
6928 | insert_single_step_breakpoint (get_frame_arch (frame), | |
6929 | get_frame_address_space (frame), | |
6930 | stop_pc); | |
6931 | ||
372316f1 | 6932 | tp->resumed = 1; |
fbea99ea | 6933 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
6934 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
6935 | } | |
6936 | else | |
6937 | { | |
6938 | if (debug_infrun) | |
6939 | fprintf_unfiltered (gdb_stdlog, | |
6940 | "infrun: expected thread still hasn't advanced\n"); | |
6941 | ||
6942 | keep_going_pass_signal (ecs); | |
6943 | } | |
6944 | return 1; | |
c447ac0b PA |
6945 | } |
6946 | ||
8b061563 PA |
6947 | /* Is thread TP in the middle of (software or hardware) |
6948 | single-stepping? (Note the result of this function must never be | |
6949 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 6950 | |
a289b8f6 | 6951 | static int |
b3444185 | 6952 | currently_stepping (struct thread_info *tp) |
a7212384 | 6953 | { |
8358c15c JK |
6954 | return ((tp->control.step_range_end |
6955 | && tp->control.step_resume_breakpoint == NULL) | |
6956 | || tp->control.trap_expected | |
af48d08f | 6957 | || tp->stepped_breakpoint |
8358c15c | 6958 | || bpstat_should_step ()); |
a7212384 UW |
6959 | } |
6960 | ||
b2175913 MS |
6961 | /* Inferior has stepped into a subroutine call with source code that |
6962 | we should not step over. Do step to the first line of code in | |
6963 | it. */ | |
c2c6d25f JM |
6964 | |
6965 | static void | |
568d6575 UW |
6966 | handle_step_into_function (struct gdbarch *gdbarch, |
6967 | struct execution_control_state *ecs) | |
c2c6d25f | 6968 | { |
43f3e411 | 6969 | struct compunit_symtab *cust; |
2afb61aa | 6970 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f | 6971 | |
7e324e48 GB |
6972 | fill_in_stop_func (gdbarch, ecs); |
6973 | ||
43f3e411 DE |
6974 | cust = find_pc_compunit_symtab (stop_pc); |
6975 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 6976 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 | 6977 | ecs->stop_func_start); |
c2c6d25f | 6978 | |
2afb61aa | 6979 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
6980 | /* Use the step_resume_break to step until the end of the prologue, |
6981 | even if that involves jumps (as it seems to on the vax under | |
6982 | 4.2). */ | |
6983 | /* If the prologue ends in the middle of a source line, continue to | |
6984 | the end of that source line (if it is still within the function). | |
6985 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
6986 | if (stop_func_sal.end |
6987 | && stop_func_sal.pc != ecs->stop_func_start | |
6988 | && stop_func_sal.end < ecs->stop_func_end) | |
6989 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 6990 | |
2dbd5e30 KB |
6991 | /* Architectures which require breakpoint adjustment might not be able |
6992 | to place a breakpoint at the computed address. If so, the test | |
6993 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
6994 | ecs->stop_func_start to an address at which a breakpoint may be | |
6995 | legitimately placed. | |
8fb3e588 | 6996 | |
2dbd5e30 KB |
6997 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
6998 | made, GDB will enter an infinite loop when stepping through | |
6999 | optimized code consisting of VLIW instructions which contain | |
7000 | subinstructions corresponding to different source lines. On | |
7001 | FR-V, it's not permitted to place a breakpoint on any but the | |
7002 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7003 | set, GDB will adjust the breakpoint address to the beginning of | |
7004 | the VLIW instruction. Thus, we need to make the corresponding | |
7005 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7006 | |
568d6575 | 7007 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7008 | { |
7009 | ecs->stop_func_start | |
568d6575 | 7010 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7011 | ecs->stop_func_start); |
2dbd5e30 KB |
7012 | } |
7013 | ||
c2c6d25f JM |
7014 | if (ecs->stop_func_start == stop_pc) |
7015 | { | |
7016 | /* We are already there: stop now. */ | |
bdc36728 | 7017 | end_stepping_range (ecs); |
c2c6d25f JM |
7018 | return; |
7019 | } | |
7020 | else | |
7021 | { | |
7022 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 7023 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
7024 | sr_sal.pc = ecs->stop_func_start; |
7025 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7026 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7027 | |
c2c6d25f | 7028 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7029 | some machines the prologue is where the new fp value is |
7030 | established. */ | |
a6d9a66e | 7031 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7032 | |
7033 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7034 | ecs->event_thread->control.step_range_end |
7035 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7036 | } |
7037 | keep_going (ecs); | |
7038 | } | |
d4f3574e | 7039 | |
b2175913 MS |
7040 | /* Inferior has stepped backward into a subroutine call with source |
7041 | code that we should not step over. Do step to the beginning of the | |
7042 | last line of code in it. */ | |
7043 | ||
7044 | static void | |
568d6575 UW |
7045 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7046 | struct execution_control_state *ecs) | |
b2175913 | 7047 | { |
43f3e411 | 7048 | struct compunit_symtab *cust; |
167e4384 | 7049 | struct symtab_and_line stop_func_sal; |
b2175913 | 7050 | |
7e324e48 GB |
7051 | fill_in_stop_func (gdbarch, ecs); |
7052 | ||
43f3e411 DE |
7053 | cust = find_pc_compunit_symtab (stop_pc); |
7054 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 7055 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 MS |
7056 | ecs->stop_func_start); |
7057 | ||
7058 | stop_func_sal = find_pc_line (stop_pc, 0); | |
7059 | ||
7060 | /* OK, we're just going to keep stepping here. */ | |
7061 | if (stop_func_sal.pc == stop_pc) | |
7062 | { | |
7063 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7064 | end_stepping_range (ecs); |
b2175913 MS |
7065 | } |
7066 | else | |
7067 | { | |
7068 | /* Else just reset the step range and keep going. | |
7069 | No step-resume breakpoint, they don't work for | |
7070 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7071 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7072 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7073 | keep_going (ecs); |
7074 | } | |
7075 | return; | |
7076 | } | |
7077 | ||
d3169d93 | 7078 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7079 | This is used to both functions and to skip over code. */ |
7080 | ||
7081 | static void | |
2c03e5be PA |
7082 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7083 | struct symtab_and_line sr_sal, | |
7084 | struct frame_id sr_id, | |
7085 | enum bptype sr_type) | |
44cbf7b5 | 7086 | { |
611c83ae PA |
7087 | /* There should never be more than one step-resume or longjmp-resume |
7088 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7089 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7090 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7091 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
7092 | |
7093 | if (debug_infrun) | |
7094 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7095 | "infrun: inserting step-resume breakpoint at %s\n", |
7096 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7097 | |
8358c15c | 7098 | inferior_thread ()->control.step_resume_breakpoint |
2c03e5be PA |
7099 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type); |
7100 | } | |
7101 | ||
9da8c2a0 | 7102 | void |
2c03e5be PA |
7103 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7104 | struct symtab_and_line sr_sal, | |
7105 | struct frame_id sr_id) | |
7106 | { | |
7107 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7108 | sr_sal, sr_id, | |
7109 | bp_step_resume); | |
44cbf7b5 | 7110 | } |
7ce450bd | 7111 | |
2c03e5be PA |
7112 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7113 | This is used to skip a potential signal handler. | |
7ce450bd | 7114 | |
14e60db5 DJ |
7115 | This is called with the interrupted function's frame. The signal |
7116 | handler, when it returns, will resume the interrupted function at | |
7117 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7118 | |
7119 | static void | |
2c03e5be | 7120 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
7121 | { |
7122 | struct symtab_and_line sr_sal; | |
a6d9a66e | 7123 | struct gdbarch *gdbarch; |
d303a6c7 | 7124 | |
f4c1edd8 | 7125 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
7126 | init_sal (&sr_sal); /* initialize to zeros */ |
7127 | ||
a6d9a66e | 7128 | gdbarch = get_frame_arch (return_frame); |
568d6575 | 7129 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7130 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7131 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7132 | |
2c03e5be PA |
7133 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7134 | get_stack_frame_id (return_frame), | |
7135 | bp_hp_step_resume); | |
d303a6c7 AC |
7136 | } |
7137 | ||
2c03e5be PA |
7138 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7139 | is used to skip a function after stepping into it (for "next" or if | |
7140 | the called function has no debugging information). | |
14e60db5 DJ |
7141 | |
7142 | The current function has almost always been reached by single | |
7143 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7144 | current function, and the breakpoint will be set at the caller's | |
7145 | resume address. | |
7146 | ||
7147 | This is a separate function rather than reusing | |
2c03e5be | 7148 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7149 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7150 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7151 | |
7152 | static void | |
7153 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7154 | { | |
7155 | struct symtab_and_line sr_sal; | |
a6d9a66e | 7156 | struct gdbarch *gdbarch; |
14e60db5 DJ |
7157 | |
7158 | /* We shouldn't have gotten here if we don't know where the call site | |
7159 | is. */ | |
c7ce8faa | 7160 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 DJ |
7161 | |
7162 | init_sal (&sr_sal); /* initialize to zeros */ | |
7163 | ||
a6d9a66e | 7164 | gdbarch = frame_unwind_caller_arch (next_frame); |
c7ce8faa DJ |
7165 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7166 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7167 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7168 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7169 | |
a6d9a66e | 7170 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7171 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7172 | } |
7173 | ||
611c83ae PA |
7174 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7175 | new breakpoint at the target of a jmp_buf. The handling of | |
7176 | longjmp-resume uses the same mechanisms used for handling | |
7177 | "step-resume" breakpoints. */ | |
7178 | ||
7179 | static void | |
a6d9a66e | 7180 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7181 | { |
e81a37f7 TT |
7182 | /* There should never be more than one longjmp-resume breakpoint per |
7183 | thread, so we should never be setting a new | |
611c83ae | 7184 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7185 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
7186 | |
7187 | if (debug_infrun) | |
7188 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7189 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
7190 | paddress (gdbarch, pc)); | |
611c83ae | 7191 | |
e81a37f7 | 7192 | inferior_thread ()->control.exception_resume_breakpoint = |
a6d9a66e | 7193 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); |
611c83ae PA |
7194 | } |
7195 | ||
186c406b TT |
7196 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7197 | the exception. The block B is the block of the unwinder debug hook | |
7198 | function. FRAME is the frame corresponding to the call to this | |
7199 | function. SYM is the symbol of the function argument holding the | |
7200 | target PC of the exception. */ | |
7201 | ||
7202 | static void | |
7203 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7204 | const struct block *b, |
186c406b TT |
7205 | struct frame_info *frame, |
7206 | struct symbol *sym) | |
7207 | { | |
492d29ea | 7208 | TRY |
186c406b | 7209 | { |
63e43d3a | 7210 | struct block_symbol vsym; |
186c406b TT |
7211 | struct value *value; |
7212 | CORE_ADDR handler; | |
7213 | struct breakpoint *bp; | |
7214 | ||
63e43d3a PMR |
7215 | vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL); |
7216 | value = read_var_value (vsym.symbol, vsym.block, frame); | |
186c406b TT |
7217 | /* If the value was optimized out, revert to the old behavior. */ |
7218 | if (! value_optimized_out (value)) | |
7219 | { | |
7220 | handler = value_as_address (value); | |
7221 | ||
7222 | if (debug_infrun) | |
7223 | fprintf_unfiltered (gdb_stdlog, | |
7224 | "infrun: exception resume at %lx\n", | |
7225 | (unsigned long) handler); | |
7226 | ||
7227 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7228 | handler, bp_exception_resume); | |
c70a6932 JK |
7229 | |
7230 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7231 | frame = NULL; | |
7232 | ||
186c406b TT |
7233 | bp->thread = tp->num; |
7234 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
7235 | } | |
7236 | } | |
492d29ea PA |
7237 | CATCH (e, RETURN_MASK_ERROR) |
7238 | { | |
7239 | /* We want to ignore errors here. */ | |
7240 | } | |
7241 | END_CATCH | |
186c406b TT |
7242 | } |
7243 | ||
28106bc2 SDJ |
7244 | /* A helper for check_exception_resume that sets an |
7245 | exception-breakpoint based on a SystemTap probe. */ | |
7246 | ||
7247 | static void | |
7248 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7249 | const struct bound_probe *probe, |
28106bc2 SDJ |
7250 | struct frame_info *frame) |
7251 | { | |
7252 | struct value *arg_value; | |
7253 | CORE_ADDR handler; | |
7254 | struct breakpoint *bp; | |
7255 | ||
7256 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7257 | if (!arg_value) | |
7258 | return; | |
7259 | ||
7260 | handler = value_as_address (arg_value); | |
7261 | ||
7262 | if (debug_infrun) | |
7263 | fprintf_unfiltered (gdb_stdlog, | |
7264 | "infrun: exception resume at %s\n", | |
6bac7473 | 7265 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
7266 | handler)); |
7267 | ||
7268 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7269 | handler, bp_exception_resume); | |
7270 | bp->thread = tp->num; | |
7271 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
7272 | } | |
7273 | ||
186c406b TT |
7274 | /* This is called when an exception has been intercepted. Check to |
7275 | see whether the exception's destination is of interest, and if so, | |
7276 | set an exception resume breakpoint there. */ | |
7277 | ||
7278 | static void | |
7279 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7280 | struct frame_info *frame) |
186c406b | 7281 | { |
729662a5 | 7282 | struct bound_probe probe; |
28106bc2 SDJ |
7283 | struct symbol *func; |
7284 | ||
7285 | /* First see if this exception unwinding breakpoint was set via a | |
7286 | SystemTap probe point. If so, the probe has two arguments: the | |
7287 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7288 | set a breakpoint there. */ | |
6bac7473 | 7289 | probe = find_probe_by_pc (get_frame_pc (frame)); |
729662a5 | 7290 | if (probe.probe) |
28106bc2 | 7291 | { |
729662a5 | 7292 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7293 | return; |
7294 | } | |
7295 | ||
7296 | func = get_frame_function (frame); | |
7297 | if (!func) | |
7298 | return; | |
186c406b | 7299 | |
492d29ea | 7300 | TRY |
186c406b | 7301 | { |
3977b71f | 7302 | const struct block *b; |
8157b174 | 7303 | struct block_iterator iter; |
186c406b TT |
7304 | struct symbol *sym; |
7305 | int argno = 0; | |
7306 | ||
7307 | /* The exception breakpoint is a thread-specific breakpoint on | |
7308 | the unwinder's debug hook, declared as: | |
7309 | ||
7310 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7311 | ||
7312 | The CFA argument indicates the frame to which control is | |
7313 | about to be transferred. HANDLER is the destination PC. | |
7314 | ||
7315 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7316 | This is not extremely efficient but it avoids issues in gdb | |
7317 | with computing the DWARF CFA, and it also works even in weird | |
7318 | cases such as throwing an exception from inside a signal | |
7319 | handler. */ | |
7320 | ||
7321 | b = SYMBOL_BLOCK_VALUE (func); | |
7322 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7323 | { | |
7324 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7325 | continue; | |
7326 | ||
7327 | if (argno == 0) | |
7328 | ++argno; | |
7329 | else | |
7330 | { | |
7331 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7332 | b, frame, sym); | |
7333 | break; | |
7334 | } | |
7335 | } | |
7336 | } | |
492d29ea PA |
7337 | CATCH (e, RETURN_MASK_ERROR) |
7338 | { | |
7339 | } | |
7340 | END_CATCH | |
186c406b TT |
7341 | } |
7342 | ||
104c1213 | 7343 | static void |
22bcd14b | 7344 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7345 | { |
527159b7 | 7346 | if (debug_infrun) |
22bcd14b | 7347 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 7348 | |
31e77af2 PA |
7349 | clear_step_over_info (); |
7350 | ||
cd0fc7c3 SS |
7351 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7352 | ecs->wait_some_more = 0; | |
fbea99ea PA |
7353 | |
7354 | /* If all-stop, but the target is always in non-stop mode, stop all | |
7355 | threads now that we're presenting the stop to the user. */ | |
7356 | if (!non_stop && target_is_non_stop_p ()) | |
7357 | stop_all_threads (); | |
cd0fc7c3 SS |
7358 | } |
7359 | ||
4d9d9d04 PA |
7360 | /* Like keep_going, but passes the signal to the inferior, even if the |
7361 | signal is set to nopass. */ | |
d4f3574e SS |
7362 | |
7363 | static void | |
4d9d9d04 | 7364 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7365 | { |
c4dbc9af PA |
7366 | /* Make sure normal_stop is called if we get a QUIT handled before |
7367 | reaching resume. */ | |
7368 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
7369 | ||
4d9d9d04 | 7370 | gdb_assert (ptid_equal (ecs->event_thread->ptid, inferior_ptid)); |
372316f1 | 7371 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7372 | |
d4f3574e | 7373 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
7374 | ecs->event_thread->prev_pc |
7375 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 7376 | |
4d9d9d04 | 7377 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7378 | { |
4d9d9d04 PA |
7379 | struct thread_info *tp = ecs->event_thread; |
7380 | ||
7381 | if (debug_infrun) | |
7382 | fprintf_unfiltered (gdb_stdlog, | |
7383 | "infrun: %s has trap_expected set, " | |
7384 | "resuming to collect trap\n", | |
7385 | target_pid_to_str (tp->ptid)); | |
7386 | ||
a9ba6bae PA |
7387 | /* We haven't yet gotten our trap, and either: intercepted a |
7388 | non-signal event (e.g., a fork); or took a signal which we | |
7389 | are supposed to pass through to the inferior. Simply | |
7390 | continue. */ | |
c4dbc9af | 7391 | discard_cleanups (old_cleanups); |
64ce06e4 | 7392 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7393 | } |
372316f1 PA |
7394 | else if (step_over_info_valid_p ()) |
7395 | { | |
7396 | /* Another thread is stepping over a breakpoint in-line. If | |
7397 | this thread needs a step-over too, queue the request. In | |
7398 | either case, this resume must be deferred for later. */ | |
7399 | struct thread_info *tp = ecs->event_thread; | |
7400 | ||
7401 | if (ecs->hit_singlestep_breakpoint | |
7402 | || thread_still_needs_step_over (tp)) | |
7403 | { | |
7404 | if (debug_infrun) | |
7405 | fprintf_unfiltered (gdb_stdlog, | |
7406 | "infrun: step-over already in progress: " | |
7407 | "step-over for %s deferred\n", | |
7408 | target_pid_to_str (tp->ptid)); | |
7409 | thread_step_over_chain_enqueue (tp); | |
7410 | } | |
7411 | else | |
7412 | { | |
7413 | if (debug_infrun) | |
7414 | fprintf_unfiltered (gdb_stdlog, | |
7415 | "infrun: step-over in progress: " | |
7416 | "resume of %s deferred\n", | |
7417 | target_pid_to_str (tp->ptid)); | |
7418 | } | |
7419 | ||
7420 | discard_cleanups (old_cleanups); | |
7421 | } | |
d4f3574e SS |
7422 | else |
7423 | { | |
31e77af2 | 7424 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7425 | int remove_bp; |
7426 | int remove_wps; | |
6c4cfb24 | 7427 | enum step_over_what step_what; |
31e77af2 | 7428 | |
d4f3574e | 7429 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7430 | anyway (if we got a signal, the user asked it be passed to |
7431 | the child) | |
7432 | -- or -- | |
7433 | We got our expected trap, but decided we should resume from | |
7434 | it. | |
d4f3574e | 7435 | |
a9ba6bae | 7436 | We're going to run this baby now! |
d4f3574e | 7437 | |
c36b740a VP |
7438 | Note that insert_breakpoints won't try to re-insert |
7439 | already inserted breakpoints. Therefore, we don't | |
7440 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7441 | |
31e77af2 PA |
7442 | /* If we need to step over a breakpoint, and we're not using |
7443 | displaced stepping to do so, insert all breakpoints | |
7444 | (watchpoints, etc.) but the one we're stepping over, step one | |
7445 | instruction, and then re-insert the breakpoint when that step | |
7446 | is finished. */ | |
963f9c80 | 7447 | |
6c4cfb24 PA |
7448 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7449 | ||
963f9c80 | 7450 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7451 | || (step_what & STEP_OVER_BREAKPOINT)); |
7452 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7453 | |
cb71640d PA |
7454 | /* We can't use displaced stepping if we need to step past a |
7455 | watchpoint. The instruction copied to the scratch pad would | |
7456 | still trigger the watchpoint. */ | |
7457 | if (remove_bp | |
3fc8eb30 | 7458 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7459 | { |
31e77af2 | 7460 | set_step_over_info (get_regcache_aspace (regcache), |
963f9c80 | 7461 | regcache_read_pc (regcache), remove_wps); |
45e8c884 | 7462 | } |
963f9c80 PA |
7463 | else if (remove_wps) |
7464 | set_step_over_info (NULL, 0, remove_wps); | |
372316f1 PA |
7465 | |
7466 | /* If we now need to do an in-line step-over, we need to stop | |
7467 | all other threads. Note this must be done before | |
7468 | insert_breakpoints below, because that removes the breakpoint | |
7469 | we're about to step over, otherwise other threads could miss | |
7470 | it. */ | |
fbea99ea | 7471 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7472 | stop_all_threads (); |
abbb1732 | 7473 | |
31e77af2 | 7474 | /* Stop stepping if inserting breakpoints fails. */ |
492d29ea | 7475 | TRY |
31e77af2 PA |
7476 | { |
7477 | insert_breakpoints (); | |
7478 | } | |
492d29ea | 7479 | CATCH (e, RETURN_MASK_ERROR) |
31e77af2 PA |
7480 | { |
7481 | exception_print (gdb_stderr, e); | |
22bcd14b | 7482 | stop_waiting (ecs); |
de1fe8c8 | 7483 | discard_cleanups (old_cleanups); |
31e77af2 | 7484 | return; |
d4f3574e | 7485 | } |
492d29ea | 7486 | END_CATCH |
d4f3574e | 7487 | |
963f9c80 | 7488 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7489 | |
c4dbc9af | 7490 | discard_cleanups (old_cleanups); |
64ce06e4 | 7491 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7492 | } |
7493 | ||
488f131b | 7494 | prepare_to_wait (ecs); |
d4f3574e SS |
7495 | } |
7496 | ||
4d9d9d04 PA |
7497 | /* Called when we should continue running the inferior, because the |
7498 | current event doesn't cause a user visible stop. This does the | |
7499 | resuming part; waiting for the next event is done elsewhere. */ | |
7500 | ||
7501 | static void | |
7502 | keep_going (struct execution_control_state *ecs) | |
7503 | { | |
7504 | if (ecs->event_thread->control.trap_expected | |
7505 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7506 | ecs->event_thread->control.trap_expected = 0; | |
7507 | ||
7508 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7509 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7510 | keep_going_pass_signal (ecs); | |
7511 | } | |
7512 | ||
104c1213 JM |
7513 | /* This function normally comes after a resume, before |
7514 | handle_inferior_event exits. It takes care of any last bits of | |
7515 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7516 | |
104c1213 JM |
7517 | static void |
7518 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7519 | { |
527159b7 | 7520 | if (debug_infrun) |
8a9de0e4 | 7521 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 7522 | |
104c1213 JM |
7523 | /* This is the old end of the while loop. Let everybody know we |
7524 | want to wait for the inferior some more and get called again | |
7525 | soon. */ | |
7526 | ecs->wait_some_more = 1; | |
c906108c | 7527 | } |
11cf8741 | 7528 | |
fd664c91 | 7529 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7530 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7531 | |
7532 | static void | |
bdc36728 | 7533 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7534 | { |
bdc36728 | 7535 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7536 | stop_waiting (ecs); |
fd664c91 PA |
7537 | } |
7538 | ||
33d62d64 JK |
7539 | /* Several print_*_reason functions to print why the inferior has stopped. |
7540 | We always print something when the inferior exits, or receives a signal. | |
7541 | The rest of the cases are dealt with later on in normal_stop and | |
7542 | print_it_typical. Ideally there should be a call to one of these | |
7543 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7544 | stop_waiting is called. |
33d62d64 | 7545 | |
fd664c91 PA |
7546 | Note that we don't call these directly, instead we delegate that to |
7547 | the interpreters, through observers. Interpreters then call these | |
7548 | with whatever uiout is right. */ | |
33d62d64 | 7549 | |
fd664c91 PA |
7550 | void |
7551 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7552 | { |
fd664c91 | 7553 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7554 | |
fd664c91 PA |
7555 | if (ui_out_is_mi_like_p (uiout)) |
7556 | { | |
7557 | ui_out_field_string (uiout, "reason", | |
7558 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
7559 | } | |
7560 | } | |
33d62d64 | 7561 | |
fd664c91 PA |
7562 | void |
7563 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7564 | { |
33d62d64 JK |
7565 | annotate_signalled (); |
7566 | if (ui_out_is_mi_like_p (uiout)) | |
7567 | ui_out_field_string | |
7568 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7569 | ui_out_text (uiout, "\nProgram terminated with signal "); | |
7570 | annotate_signal_name (); | |
7571 | ui_out_field_string (uiout, "signal-name", | |
2ea28649 | 7572 | gdb_signal_to_name (siggnal)); |
33d62d64 JK |
7573 | annotate_signal_name_end (); |
7574 | ui_out_text (uiout, ", "); | |
7575 | annotate_signal_string (); | |
7576 | ui_out_field_string (uiout, "signal-meaning", | |
2ea28649 | 7577 | gdb_signal_to_string (siggnal)); |
33d62d64 JK |
7578 | annotate_signal_string_end (); |
7579 | ui_out_text (uiout, ".\n"); | |
7580 | ui_out_text (uiout, "The program no longer exists.\n"); | |
7581 | } | |
7582 | ||
fd664c91 PA |
7583 | void |
7584 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7585 | { |
fda326dd TT |
7586 | struct inferior *inf = current_inferior (); |
7587 | const char *pidstr = target_pid_to_str (pid_to_ptid (inf->pid)); | |
7588 | ||
33d62d64 JK |
7589 | annotate_exited (exitstatus); |
7590 | if (exitstatus) | |
7591 | { | |
7592 | if (ui_out_is_mi_like_p (uiout)) | |
7593 | ui_out_field_string (uiout, "reason", | |
7594 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
fda326dd TT |
7595 | ui_out_text (uiout, "[Inferior "); |
7596 | ui_out_text (uiout, plongest (inf->num)); | |
7597 | ui_out_text (uiout, " ("); | |
7598 | ui_out_text (uiout, pidstr); | |
7599 | ui_out_text (uiout, ") exited with code "); | |
33d62d64 | 7600 | ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) exitstatus); |
fda326dd | 7601 | ui_out_text (uiout, "]\n"); |
33d62d64 JK |
7602 | } |
7603 | else | |
11cf8741 | 7604 | { |
9dc5e2a9 | 7605 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f | 7606 | ui_out_field_string |
33d62d64 | 7607 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); |
fda326dd TT |
7608 | ui_out_text (uiout, "[Inferior "); |
7609 | ui_out_text (uiout, plongest (inf->num)); | |
7610 | ui_out_text (uiout, " ("); | |
7611 | ui_out_text (uiout, pidstr); | |
7612 | ui_out_text (uiout, ") exited normally]\n"); | |
33d62d64 | 7613 | } |
33d62d64 JK |
7614 | } |
7615 | ||
fd664c91 PA |
7616 | void |
7617 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 JK |
7618 | { |
7619 | annotate_signal (); | |
7620 | ||
a493e3e2 | 7621 | if (siggnal == GDB_SIGNAL_0 && !ui_out_is_mi_like_p (uiout)) |
33d62d64 JK |
7622 | { |
7623 | struct thread_info *t = inferior_thread (); | |
7624 | ||
7625 | ui_out_text (uiout, "\n["); | |
7626 | ui_out_field_string (uiout, "thread-name", | |
7627 | target_pid_to_str (t->ptid)); | |
7628 | ui_out_field_fmt (uiout, "thread-id", "] #%d", t->num); | |
7629 | ui_out_text (uiout, " stopped"); | |
7630 | } | |
7631 | else | |
7632 | { | |
7633 | ui_out_text (uiout, "\nProgram received signal "); | |
8b93c638 | 7634 | annotate_signal_name (); |
33d62d64 JK |
7635 | if (ui_out_is_mi_like_p (uiout)) |
7636 | ui_out_field_string | |
7637 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b | 7638 | ui_out_field_string (uiout, "signal-name", |
2ea28649 | 7639 | gdb_signal_to_name (siggnal)); |
8b93c638 JM |
7640 | annotate_signal_name_end (); |
7641 | ui_out_text (uiout, ", "); | |
7642 | annotate_signal_string (); | |
488f131b | 7643 | ui_out_field_string (uiout, "signal-meaning", |
2ea28649 | 7644 | gdb_signal_to_string (siggnal)); |
8b93c638 | 7645 | annotate_signal_string_end (); |
33d62d64 JK |
7646 | } |
7647 | ui_out_text (uiout, ".\n"); | |
7648 | } | |
252fbfc8 | 7649 | |
fd664c91 PA |
7650 | void |
7651 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 7652 | { |
fd664c91 | 7653 | ui_out_text (uiout, "\nNo more reverse-execution history.\n"); |
11cf8741 | 7654 | } |
43ff13b4 | 7655 | |
0c7e1a46 PA |
7656 | /* Print current location without a level number, if we have changed |
7657 | functions or hit a breakpoint. Print source line if we have one. | |
7658 | bpstat_print contains the logic deciding in detail what to print, | |
7659 | based on the event(s) that just occurred. */ | |
7660 | ||
7661 | void | |
7662 | print_stop_event (struct target_waitstatus *ws) | |
7663 | { | |
7664 | int bpstat_ret; | |
f486487f | 7665 | enum print_what source_flag; |
0c7e1a46 PA |
7666 | int do_frame_printing = 1; |
7667 | struct thread_info *tp = inferior_thread (); | |
7668 | ||
7669 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
7670 | switch (bpstat_ret) | |
7671 | { | |
7672 | case PRINT_UNKNOWN: | |
7673 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
7674 | should) carry around the function and does (or should) use | |
7675 | that when doing a frame comparison. */ | |
7676 | if (tp->control.stop_step | |
7677 | && frame_id_eq (tp->control.step_frame_id, | |
7678 | get_frame_id (get_current_frame ())) | |
885eeb5b | 7679 | && tp->control.step_start_function == find_pc_function (stop_pc)) |
0c7e1a46 PA |
7680 | { |
7681 | /* Finished step, just print source line. */ | |
7682 | source_flag = SRC_LINE; | |
7683 | } | |
7684 | else | |
7685 | { | |
7686 | /* Print location and source line. */ | |
7687 | source_flag = SRC_AND_LOC; | |
7688 | } | |
7689 | break; | |
7690 | case PRINT_SRC_AND_LOC: | |
7691 | /* Print location and source line. */ | |
7692 | source_flag = SRC_AND_LOC; | |
7693 | break; | |
7694 | case PRINT_SRC_ONLY: | |
7695 | source_flag = SRC_LINE; | |
7696 | break; | |
7697 | case PRINT_NOTHING: | |
7698 | /* Something bogus. */ | |
7699 | source_flag = SRC_LINE; | |
7700 | do_frame_printing = 0; | |
7701 | break; | |
7702 | default: | |
7703 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
7704 | } | |
7705 | ||
7706 | /* The behavior of this routine with respect to the source | |
7707 | flag is: | |
7708 | SRC_LINE: Print only source line | |
7709 | LOCATION: Print only location | |
7710 | SRC_AND_LOC: Print location and source line. */ | |
7711 | if (do_frame_printing) | |
7712 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
7713 | ||
7714 | /* Display the auto-display expressions. */ | |
7715 | do_displays (); | |
7716 | } | |
7717 | ||
c906108c SS |
7718 | /* Here to return control to GDB when the inferior stops for real. |
7719 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
7720 | ||
7721 | STOP_PRINT_FRAME nonzero means print the executing frame | |
7722 | (pc, function, args, file, line number and line text). | |
7723 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
7724 | attempting to insert breakpoints. */ | |
7725 | ||
7726 | void | |
96baa820 | 7727 | normal_stop (void) |
c906108c | 7728 | { |
73b65bb0 DJ |
7729 | struct target_waitstatus last; |
7730 | ptid_t last_ptid; | |
29f49a6a | 7731 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
e1316e60 | 7732 | ptid_t pid_ptid; |
73b65bb0 DJ |
7733 | |
7734 | get_last_target_status (&last_ptid, &last); | |
7735 | ||
29f49a6a PA |
7736 | /* If an exception is thrown from this point on, make sure to |
7737 | propagate GDB's knowledge of the executing state to the | |
7738 | frontend/user running state. A QUIT is an easy exception to see | |
7739 | here, so do this before any filtered output. */ | |
c35b1492 PA |
7740 | if (!non_stop) |
7741 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
e1316e60 PA |
7742 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
7743 | || last.kind == TARGET_WAITKIND_EXITED) | |
7744 | { | |
7745 | /* On some targets, we may still have live threads in the | |
7746 | inferior when we get a process exit event. E.g., for | |
7747 | "checkpoint", when the current checkpoint/fork exits, | |
7748 | linux-fork.c automatically switches to another fork from | |
7749 | within target_mourn_inferior. */ | |
7750 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
7751 | { | |
7752 | pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
7753 | make_cleanup (finish_thread_state_cleanup, &pid_ptid); | |
7754 | } | |
7755 | } | |
7756 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c35b1492 | 7757 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); |
29f49a6a | 7758 | |
b57bacec PA |
7759 | /* As we're presenting a stop, and potentially removing breakpoints, |
7760 | update the thread list so we can tell whether there are threads | |
7761 | running on the target. With target remote, for example, we can | |
7762 | only learn about new threads when we explicitly update the thread | |
7763 | list. Do this before notifying the interpreters about signal | |
7764 | stops, end of stepping ranges, etc., so that the "new thread" | |
7765 | output is emitted before e.g., "Program received signal FOO", | |
7766 | instead of after. */ | |
7767 | update_thread_list (); | |
7768 | ||
7769 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
7770 | observer_notify_signal_received (inferior_thread ()->suspend.stop_signal); | |
7771 | ||
c906108c SS |
7772 | /* As with the notification of thread events, we want to delay |
7773 | notifying the user that we've switched thread context until | |
7774 | the inferior actually stops. | |
7775 | ||
73b65bb0 DJ |
7776 | There's no point in saying anything if the inferior has exited. |
7777 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
7778 | "received a signal". |
7779 | ||
7780 | Also skip saying anything in non-stop mode. In that mode, as we | |
7781 | don't want GDB to switch threads behind the user's back, to avoid | |
7782 | races where the user is typing a command to apply to thread x, | |
7783 | but GDB switches to thread y before the user finishes entering | |
7784 | the command, fetch_inferior_event installs a cleanup to restore | |
7785 | the current thread back to the thread the user had selected right | |
7786 | after this event is handled, so we're not really switching, only | |
7787 | informing of a stop. */ | |
4f8d22e3 PA |
7788 | if (!non_stop |
7789 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
7790 | && target_has_execution |
7791 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
7792 | && last.kind != TARGET_WAITKIND_EXITED |
7793 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c SS |
7794 | { |
7795 | target_terminal_ours_for_output (); | |
a3f17187 | 7796 | printf_filtered (_("[Switching to %s]\n"), |
c95310c6 | 7797 | target_pid_to_str (inferior_ptid)); |
b8fa951a | 7798 | annotate_thread_changed (); |
39f77062 | 7799 | previous_inferior_ptid = inferior_ptid; |
c906108c | 7800 | } |
c906108c | 7801 | |
0e5bf2a8 PA |
7802 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
7803 | { | |
7804 | gdb_assert (sync_execution || !target_can_async_p ()); | |
7805 | ||
7806 | target_terminal_ours_for_output (); | |
7807 | printf_filtered (_("No unwaited-for children left.\n")); | |
7808 | } | |
7809 | ||
b57bacec | 7810 | /* Note: this depends on the update_thread_list call above. */ |
a25a5a45 | 7811 | if (!breakpoints_should_be_inserted_now () && target_has_execution) |
c906108c SS |
7812 | { |
7813 | if (remove_breakpoints ()) | |
7814 | { | |
7815 | target_terminal_ours_for_output (); | |
3e43a32a MS |
7816 | printf_filtered (_("Cannot remove breakpoints because " |
7817 | "program is no longer writable.\nFurther " | |
7818 | "execution is probably impossible.\n")); | |
c906108c SS |
7819 | } |
7820 | } | |
c906108c | 7821 | |
c906108c SS |
7822 | /* If an auto-display called a function and that got a signal, |
7823 | delete that auto-display to avoid an infinite recursion. */ | |
7824 | ||
7825 | if (stopped_by_random_signal) | |
7826 | disable_current_display (); | |
7827 | ||
b57bacec | 7828 | /* Notify observers if we finished a "step"-like command, etc. */ |
af679fd0 PA |
7829 | if (target_has_execution |
7830 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
7831 | && last.kind != TARGET_WAITKIND_EXITED | |
16c381f0 | 7832 | && inferior_thread ()->control.stop_step) |
b57bacec | 7833 | { |
31cc0b80 | 7834 | /* But not if in the middle of doing a "step n" operation for |
b57bacec PA |
7835 | n > 1 */ |
7836 | if (inferior_thread ()->step_multi) | |
7837 | goto done; | |
7838 | ||
7839 | observer_notify_end_stepping_range (); | |
7840 | } | |
c906108c SS |
7841 | |
7842 | target_terminal_ours (); | |
0f641c01 | 7843 | async_enable_stdin (); |
c906108c | 7844 | |
7abfe014 DJ |
7845 | /* Set the current source location. This will also happen if we |
7846 | display the frame below, but the current SAL will be incorrect | |
7847 | during a user hook-stop function. */ | |
d729566a | 7848 | if (has_stack_frames () && !stop_stack_dummy) |
5166082f | 7849 | set_current_sal_from_frame (get_current_frame ()); |
7abfe014 | 7850 | |
28bf096c PA |
7851 | /* Let the user/frontend see the threads as stopped, but defer to |
7852 | call_function_by_hand if the thread finished an infcall | |
7853 | successfully. We may be e.g., evaluating a breakpoint condition. | |
7854 | In that case, the thread had state THREAD_RUNNING before the | |
7855 | infcall, and shall remain marked running, all without informing | |
7856 | the user/frontend about state transition changes. */ | |
7857 | if (target_has_execution | |
7858 | && inferior_thread ()->control.in_infcall | |
7859 | && stop_stack_dummy == STOP_STACK_DUMMY) | |
251bde03 PA |
7860 | discard_cleanups (old_chain); |
7861 | else | |
7862 | do_cleanups (old_chain); | |
dd7e2d2b PA |
7863 | |
7864 | /* Look up the hook_stop and run it (CLI internally handles problem | |
7865 | of stop_command's pre-hook not existing). */ | |
7866 | if (stop_command) | |
7867 | catch_errors (hook_stop_stub, stop_command, | |
7868 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
7869 | ||
d729566a | 7870 | if (!has_stack_frames ()) |
d51fd4c8 | 7871 | goto done; |
c906108c | 7872 | |
32400beb PA |
7873 | if (last.kind == TARGET_WAITKIND_SIGNALLED |
7874 | || last.kind == TARGET_WAITKIND_EXITED) | |
7875 | goto done; | |
7876 | ||
c906108c SS |
7877 | /* Select innermost stack frame - i.e., current frame is frame 0, |
7878 | and current location is based on that. | |
7879 | Don't do this on return from a stack dummy routine, | |
1777feb0 | 7880 | or if the program has exited. */ |
c906108c SS |
7881 | |
7882 | if (!stop_stack_dummy) | |
7883 | { | |
0f7d239c | 7884 | select_frame (get_current_frame ()); |
c906108c | 7885 | |
d01a8610 AS |
7886 | /* If --batch-silent is enabled then there's no need to print the current |
7887 | source location, and to try risks causing an error message about | |
7888 | missing source files. */ | |
7889 | if (stop_print_frame && !batch_silent) | |
0c7e1a46 | 7890 | print_stop_event (&last); |
c906108c SS |
7891 | } |
7892 | ||
aa7d318d | 7893 | if (stop_stack_dummy == STOP_STACK_DUMMY) |
c906108c | 7894 | { |
b89667eb DE |
7895 | /* Pop the empty frame that contains the stack dummy. |
7896 | This also restores inferior state prior to the call | |
16c381f0 | 7897 | (struct infcall_suspend_state). */ |
b89667eb | 7898 | struct frame_info *frame = get_current_frame (); |
abbb1732 | 7899 | |
b89667eb DE |
7900 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); |
7901 | frame_pop (frame); | |
3e43a32a MS |
7902 | /* frame_pop() calls reinit_frame_cache as the last thing it |
7903 | does which means there's currently no selected frame. We | |
7904 | don't need to re-establish a selected frame if the dummy call | |
7905 | returns normally, that will be done by | |
7906 | restore_infcall_control_state. However, we do have to handle | |
7907 | the case where the dummy call is returning after being | |
7908 | stopped (e.g. the dummy call previously hit a breakpoint). | |
7909 | We can't know which case we have so just always re-establish | |
7910 | a selected frame here. */ | |
0f7d239c | 7911 | select_frame (get_current_frame ()); |
c906108c SS |
7912 | } |
7913 | ||
c906108c SS |
7914 | done: |
7915 | annotate_stopped (); | |
41d2bdb4 PA |
7916 | |
7917 | /* Suppress the stop observer if we're in the middle of: | |
7918 | ||
7919 | - a step n (n > 1), as there still more steps to be done. | |
7920 | ||
7921 | - a "finish" command, as the observer will be called in | |
7922 | finish_command_continuation, so it can include the inferior | |
7923 | function's return value. | |
7924 | ||
7925 | - calling an inferior function, as we pretend we inferior didn't | |
7926 | run at all. The return value of the call is handled by the | |
7927 | expression evaluator, through call_function_by_hand. */ | |
7928 | ||
7929 | if (!target_has_execution | |
7930 | || last.kind == TARGET_WAITKIND_SIGNALLED | |
7931 | || last.kind == TARGET_WAITKIND_EXITED | |
0e5bf2a8 | 7932 | || last.kind == TARGET_WAITKIND_NO_RESUMED |
2ca0b532 PA |
7933 | || (!(inferior_thread ()->step_multi |
7934 | && inferior_thread ()->control.stop_step) | |
16c381f0 JK |
7935 | && !(inferior_thread ()->control.stop_bpstat |
7936 | && inferior_thread ()->control.proceed_to_finish) | |
7937 | && !inferior_thread ()->control.in_infcall)) | |
347bddb7 PA |
7938 | { |
7939 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
16c381f0 | 7940 | observer_notify_normal_stop (inferior_thread ()->control.stop_bpstat, |
1d33d6ba | 7941 | stop_print_frame); |
347bddb7 | 7942 | else |
1d33d6ba | 7943 | observer_notify_normal_stop (NULL, stop_print_frame); |
347bddb7 | 7944 | } |
347bddb7 | 7945 | |
48844aa6 PA |
7946 | if (target_has_execution) |
7947 | { | |
7948 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
7949 | && last.kind != TARGET_WAITKIND_EXITED) | |
7950 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
7951 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 7952 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 7953 | } |
6c95b8df PA |
7954 | |
7955 | /* Try to get rid of automatically added inferiors that are no | |
7956 | longer needed. Keeping those around slows down things linearly. | |
7957 | Note that this never removes the current inferior. */ | |
7958 | prune_inferiors (); | |
c906108c SS |
7959 | } |
7960 | ||
7961 | static int | |
96baa820 | 7962 | hook_stop_stub (void *cmd) |
c906108c | 7963 | { |
5913bcb0 | 7964 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
7965 | return (0); |
7966 | } | |
7967 | \f | |
c5aa993b | 7968 | int |
96baa820 | 7969 | signal_stop_state (int signo) |
c906108c | 7970 | { |
d6b48e9c | 7971 | return signal_stop[signo]; |
c906108c SS |
7972 | } |
7973 | ||
c5aa993b | 7974 | int |
96baa820 | 7975 | signal_print_state (int signo) |
c906108c SS |
7976 | { |
7977 | return signal_print[signo]; | |
7978 | } | |
7979 | ||
c5aa993b | 7980 | int |
96baa820 | 7981 | signal_pass_state (int signo) |
c906108c SS |
7982 | { |
7983 | return signal_program[signo]; | |
7984 | } | |
7985 | ||
2455069d UW |
7986 | static void |
7987 | signal_cache_update (int signo) | |
7988 | { | |
7989 | if (signo == -1) | |
7990 | { | |
a493e3e2 | 7991 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
7992 | signal_cache_update (signo); |
7993 | ||
7994 | return; | |
7995 | } | |
7996 | ||
7997 | signal_pass[signo] = (signal_stop[signo] == 0 | |
7998 | && signal_print[signo] == 0 | |
ab04a2af TT |
7999 | && signal_program[signo] == 1 |
8000 | && signal_catch[signo] == 0); | |
2455069d UW |
8001 | } |
8002 | ||
488f131b | 8003 | int |
7bda5e4a | 8004 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8005 | { |
8006 | int ret = signal_stop[signo]; | |
abbb1732 | 8007 | |
d4f3574e | 8008 | signal_stop[signo] = state; |
2455069d | 8009 | signal_cache_update (signo); |
d4f3574e SS |
8010 | return ret; |
8011 | } | |
8012 | ||
488f131b | 8013 | int |
7bda5e4a | 8014 | signal_print_update (int signo, int state) |
d4f3574e SS |
8015 | { |
8016 | int ret = signal_print[signo]; | |
abbb1732 | 8017 | |
d4f3574e | 8018 | signal_print[signo] = state; |
2455069d | 8019 | signal_cache_update (signo); |
d4f3574e SS |
8020 | return ret; |
8021 | } | |
8022 | ||
488f131b | 8023 | int |
7bda5e4a | 8024 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8025 | { |
8026 | int ret = signal_program[signo]; | |
abbb1732 | 8027 | |
d4f3574e | 8028 | signal_program[signo] = state; |
2455069d | 8029 | signal_cache_update (signo); |
d4f3574e SS |
8030 | return ret; |
8031 | } | |
8032 | ||
ab04a2af TT |
8033 | /* Update the global 'signal_catch' from INFO and notify the |
8034 | target. */ | |
8035 | ||
8036 | void | |
8037 | signal_catch_update (const unsigned int *info) | |
8038 | { | |
8039 | int i; | |
8040 | ||
8041 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8042 | signal_catch[i] = info[i] > 0; | |
8043 | signal_cache_update (-1); | |
8044 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
8045 | } | |
8046 | ||
c906108c | 8047 | static void |
96baa820 | 8048 | sig_print_header (void) |
c906108c | 8049 | { |
3e43a32a MS |
8050 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8051 | "to program\tDescription\n")); | |
c906108c SS |
8052 | } |
8053 | ||
8054 | static void | |
2ea28649 | 8055 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8056 | { |
2ea28649 | 8057 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8058 | int name_padding = 13 - strlen (name); |
96baa820 | 8059 | |
c906108c SS |
8060 | if (name_padding <= 0) |
8061 | name_padding = 0; | |
8062 | ||
8063 | printf_filtered ("%s", name); | |
488f131b | 8064 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8065 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8066 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8067 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8068 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8069 | } |
8070 | ||
8071 | /* Specify how various signals in the inferior should be handled. */ | |
8072 | ||
8073 | static void | |
96baa820 | 8074 | handle_command (char *args, int from_tty) |
c906108c SS |
8075 | { |
8076 | char **argv; | |
8077 | int digits, wordlen; | |
8078 | int sigfirst, signum, siglast; | |
2ea28649 | 8079 | enum gdb_signal oursig; |
c906108c SS |
8080 | int allsigs; |
8081 | int nsigs; | |
8082 | unsigned char *sigs; | |
8083 | struct cleanup *old_chain; | |
8084 | ||
8085 | if (args == NULL) | |
8086 | { | |
e2e0b3e5 | 8087 | error_no_arg (_("signal to handle")); |
c906108c SS |
8088 | } |
8089 | ||
1777feb0 | 8090 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8091 | |
a493e3e2 | 8092 | nsigs = (int) GDB_SIGNAL_LAST; |
c906108c SS |
8093 | sigs = (unsigned char *) alloca (nsigs); |
8094 | memset (sigs, 0, nsigs); | |
8095 | ||
1777feb0 | 8096 | /* Break the command line up into args. */ |
c906108c | 8097 | |
d1a41061 | 8098 | argv = gdb_buildargv (args); |
7a292a7a | 8099 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
8100 | |
8101 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8102 | actions. Signal numbers and signal names may be interspersed with | |
8103 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8104 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c SS |
8105 | |
8106 | while (*argv != NULL) | |
8107 | { | |
8108 | wordlen = strlen (*argv); | |
8109 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
8110 | {; | |
8111 | } | |
8112 | allsigs = 0; | |
8113 | sigfirst = siglast = -1; | |
8114 | ||
8115 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
8116 | { | |
8117 | /* Apply action to all signals except those used by the | |
1777feb0 | 8118 | debugger. Silently skip those. */ |
c906108c SS |
8119 | allsigs = 1; |
8120 | sigfirst = 0; | |
8121 | siglast = nsigs - 1; | |
8122 | } | |
8123 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
8124 | { | |
8125 | SET_SIGS (nsigs, sigs, signal_stop); | |
8126 | SET_SIGS (nsigs, sigs, signal_print); | |
8127 | } | |
8128 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
8129 | { | |
8130 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8131 | } | |
8132 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
8133 | { | |
8134 | SET_SIGS (nsigs, sigs, signal_print); | |
8135 | } | |
8136 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
8137 | { | |
8138 | SET_SIGS (nsigs, sigs, signal_program); | |
8139 | } | |
8140 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
8141 | { | |
8142 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8143 | } | |
8144 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
8145 | { | |
8146 | SET_SIGS (nsigs, sigs, signal_program); | |
8147 | } | |
8148 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
8149 | { | |
8150 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8151 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8152 | } | |
8153 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
8154 | { | |
8155 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8156 | } | |
8157 | else if (digits > 0) | |
8158 | { | |
8159 | /* It is numeric. The numeric signal refers to our own | |
8160 | internal signal numbering from target.h, not to host/target | |
8161 | signal number. This is a feature; users really should be | |
8162 | using symbolic names anyway, and the common ones like | |
8163 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8164 | ||
8165 | sigfirst = siglast = (int) | |
2ea28649 | 8166 | gdb_signal_from_command (atoi (*argv)); |
c906108c SS |
8167 | if ((*argv)[digits] == '-') |
8168 | { | |
8169 | siglast = (int) | |
2ea28649 | 8170 | gdb_signal_from_command (atoi ((*argv) + digits + 1)); |
c906108c SS |
8171 | } |
8172 | if (sigfirst > siglast) | |
8173 | { | |
1777feb0 | 8174 | /* Bet he didn't figure we'd think of this case... */ |
c906108c SS |
8175 | signum = sigfirst; |
8176 | sigfirst = siglast; | |
8177 | siglast = signum; | |
8178 | } | |
8179 | } | |
8180 | else | |
8181 | { | |
2ea28649 | 8182 | oursig = gdb_signal_from_name (*argv); |
a493e3e2 | 8183 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8184 | { |
8185 | sigfirst = siglast = (int) oursig; | |
8186 | } | |
8187 | else | |
8188 | { | |
8189 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 8190 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
8191 | } |
8192 | } | |
8193 | ||
8194 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8195 | which signals to apply actions to. */ |
c906108c SS |
8196 | |
8197 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
8198 | { | |
2ea28649 | 8199 | switch ((enum gdb_signal) signum) |
c906108c | 8200 | { |
a493e3e2 PA |
8201 | case GDB_SIGNAL_TRAP: |
8202 | case GDB_SIGNAL_INT: | |
c906108c SS |
8203 | if (!allsigs && !sigs[signum]) |
8204 | { | |
9e2f0ad4 | 8205 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8206 | Are you sure you want to change it? "), |
2ea28649 | 8207 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8208 | { |
8209 | sigs[signum] = 1; | |
8210 | } | |
8211 | else | |
8212 | { | |
a3f17187 | 8213 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8214 | gdb_flush (gdb_stdout); |
8215 | } | |
8216 | } | |
8217 | break; | |
a493e3e2 PA |
8218 | case GDB_SIGNAL_0: |
8219 | case GDB_SIGNAL_DEFAULT: | |
8220 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8221 | /* Make sure that "all" doesn't print these. */ |
8222 | break; | |
8223 | default: | |
8224 | sigs[signum] = 1; | |
8225 | break; | |
8226 | } | |
8227 | } | |
8228 | ||
8229 | argv++; | |
8230 | } | |
8231 | ||
3a031f65 PA |
8232 | for (signum = 0; signum < nsigs; signum++) |
8233 | if (sigs[signum]) | |
8234 | { | |
2455069d | 8235 | signal_cache_update (-1); |
a493e3e2 PA |
8236 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); |
8237 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); | |
c906108c | 8238 | |
3a031f65 PA |
8239 | if (from_tty) |
8240 | { | |
8241 | /* Show the results. */ | |
8242 | sig_print_header (); | |
8243 | for (; signum < nsigs; signum++) | |
8244 | if (sigs[signum]) | |
aead7601 | 8245 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8246 | } |
8247 | ||
8248 | break; | |
8249 | } | |
c906108c SS |
8250 | |
8251 | do_cleanups (old_chain); | |
8252 | } | |
8253 | ||
de0bea00 MF |
8254 | /* Complete the "handle" command. */ |
8255 | ||
8256 | static VEC (char_ptr) * | |
8257 | handle_completer (struct cmd_list_element *ignore, | |
6f937416 | 8258 | const char *text, const char *word) |
de0bea00 MF |
8259 | { |
8260 | VEC (char_ptr) *vec_signals, *vec_keywords, *return_val; | |
8261 | static const char * const keywords[] = | |
8262 | { | |
8263 | "all", | |
8264 | "stop", | |
8265 | "ignore", | |
8266 | "print", | |
8267 | "pass", | |
8268 | "nostop", | |
8269 | "noignore", | |
8270 | "noprint", | |
8271 | "nopass", | |
8272 | NULL, | |
8273 | }; | |
8274 | ||
8275 | vec_signals = signal_completer (ignore, text, word); | |
8276 | vec_keywords = complete_on_enum (keywords, word, word); | |
8277 | ||
8278 | return_val = VEC_merge (char_ptr, vec_signals, vec_keywords); | |
8279 | VEC_free (char_ptr, vec_signals); | |
8280 | VEC_free (char_ptr, vec_keywords); | |
8281 | return return_val; | |
8282 | } | |
8283 | ||
2ea28649 PA |
8284 | enum gdb_signal |
8285 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8286 | { |
8287 | if (num >= 1 && num <= 15) | |
2ea28649 | 8288 | return (enum gdb_signal) num; |
ed01b82c PA |
8289 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8290 | Use \"info signals\" for a list of symbolic signals.")); | |
8291 | } | |
8292 | ||
c906108c SS |
8293 | /* Print current contents of the tables set by the handle command. |
8294 | It is possible we should just be printing signals actually used | |
8295 | by the current target (but for things to work right when switching | |
8296 | targets, all signals should be in the signal tables). */ | |
8297 | ||
8298 | static void | |
96baa820 | 8299 | signals_info (char *signum_exp, int from_tty) |
c906108c | 8300 | { |
2ea28649 | 8301 | enum gdb_signal oursig; |
abbb1732 | 8302 | |
c906108c SS |
8303 | sig_print_header (); |
8304 | ||
8305 | if (signum_exp) | |
8306 | { | |
8307 | /* First see if this is a symbol name. */ | |
2ea28649 | 8308 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8309 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8310 | { |
8311 | /* No, try numeric. */ | |
8312 | oursig = | |
2ea28649 | 8313 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8314 | } |
8315 | sig_print_info (oursig); | |
8316 | return; | |
8317 | } | |
8318 | ||
8319 | printf_filtered ("\n"); | |
8320 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8321 | for (oursig = GDB_SIGNAL_FIRST; |
8322 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8323 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8324 | { |
8325 | QUIT; | |
8326 | ||
a493e3e2 PA |
8327 | if (oursig != GDB_SIGNAL_UNKNOWN |
8328 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8329 | sig_print_info (oursig); |
8330 | } | |
8331 | ||
3e43a32a MS |
8332 | printf_filtered (_("\nUse the \"handle\" command " |
8333 | "to change these tables.\n")); | |
c906108c | 8334 | } |
4aa995e1 | 8335 | |
c709acd1 PA |
8336 | /* Check if it makes sense to read $_siginfo from the current thread |
8337 | at this point. If not, throw an error. */ | |
8338 | ||
8339 | static void | |
8340 | validate_siginfo_access (void) | |
8341 | { | |
8342 | /* No current inferior, no siginfo. */ | |
8343 | if (ptid_equal (inferior_ptid, null_ptid)) | |
8344 | error (_("No thread selected.")); | |
8345 | ||
8346 | /* Don't try to read from a dead thread. */ | |
8347 | if (is_exited (inferior_ptid)) | |
8348 | error (_("The current thread has terminated")); | |
8349 | ||
8350 | /* ... or from a spinning thread. */ | |
8351 | if (is_running (inferior_ptid)) | |
8352 | error (_("Selected thread is running.")); | |
8353 | } | |
8354 | ||
4aa995e1 PA |
8355 | /* The $_siginfo convenience variable is a bit special. We don't know |
8356 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8357 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8358 | also dependent on which thread you have selected. |
8359 | ||
8360 | 1. making $_siginfo be an internalvar that creates a new value on | |
8361 | access. | |
8362 | ||
8363 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8364 | ||
8365 | /* This function implements the lval_computed support for reading a | |
8366 | $_siginfo value. */ | |
8367 | ||
8368 | static void | |
8369 | siginfo_value_read (struct value *v) | |
8370 | { | |
8371 | LONGEST transferred; | |
8372 | ||
c709acd1 PA |
8373 | validate_siginfo_access (); |
8374 | ||
4aa995e1 PA |
8375 | transferred = |
8376 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
8377 | NULL, | |
8378 | value_contents_all_raw (v), | |
8379 | value_offset (v), | |
8380 | TYPE_LENGTH (value_type (v))); | |
8381 | ||
8382 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8383 | error (_("Unable to read siginfo")); | |
8384 | } | |
8385 | ||
8386 | /* This function implements the lval_computed support for writing a | |
8387 | $_siginfo value. */ | |
8388 | ||
8389 | static void | |
8390 | siginfo_value_write (struct value *v, struct value *fromval) | |
8391 | { | |
8392 | LONGEST transferred; | |
8393 | ||
c709acd1 PA |
8394 | validate_siginfo_access (); |
8395 | ||
4aa995e1 PA |
8396 | transferred = target_write (¤t_target, |
8397 | TARGET_OBJECT_SIGNAL_INFO, | |
8398 | NULL, | |
8399 | value_contents_all_raw (fromval), | |
8400 | value_offset (v), | |
8401 | TYPE_LENGTH (value_type (fromval))); | |
8402 | ||
8403 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8404 | error (_("Unable to write siginfo")); | |
8405 | } | |
8406 | ||
c8f2448a | 8407 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8408 | { |
8409 | siginfo_value_read, | |
8410 | siginfo_value_write | |
8411 | }; | |
8412 | ||
8413 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8414 | the current thread using architecture GDBARCH. Return a void value |
8415 | if there's no object available. */ | |
4aa995e1 | 8416 | |
2c0b251b | 8417 | static struct value * |
22d2b532 SDJ |
8418 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8419 | void *ignore) | |
4aa995e1 | 8420 | { |
4aa995e1 | 8421 | if (target_has_stack |
78267919 UW |
8422 | && !ptid_equal (inferior_ptid, null_ptid) |
8423 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
4aa995e1 | 8424 | { |
78267919 | 8425 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8426 | |
78267919 | 8427 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8428 | } |
8429 | ||
78267919 | 8430 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8431 | } |
8432 | ||
c906108c | 8433 | \f |
16c381f0 JK |
8434 | /* infcall_suspend_state contains state about the program itself like its |
8435 | registers and any signal it received when it last stopped. | |
8436 | This state must be restored regardless of how the inferior function call | |
8437 | ends (either successfully, or after it hits a breakpoint or signal) | |
8438 | if the program is to properly continue where it left off. */ | |
8439 | ||
8440 | struct infcall_suspend_state | |
7a292a7a | 8441 | { |
16c381f0 | 8442 | struct thread_suspend_state thread_suspend; |
16c381f0 JK |
8443 | |
8444 | /* Other fields: */ | |
7a292a7a | 8445 | CORE_ADDR stop_pc; |
b89667eb | 8446 | struct regcache *registers; |
1736ad11 | 8447 | |
35515841 | 8448 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
1736ad11 JK |
8449 | struct gdbarch *siginfo_gdbarch; |
8450 | ||
8451 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8452 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8453 | content would be invalid. */ | |
8454 | gdb_byte *siginfo_data; | |
b89667eb DE |
8455 | }; |
8456 | ||
16c381f0 JK |
8457 | struct infcall_suspend_state * |
8458 | save_infcall_suspend_state (void) | |
b89667eb | 8459 | { |
16c381f0 | 8460 | struct infcall_suspend_state *inf_state; |
b89667eb | 8461 | struct thread_info *tp = inferior_thread (); |
1736ad11 JK |
8462 | struct regcache *regcache = get_current_regcache (); |
8463 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
8464 | gdb_byte *siginfo_data = NULL; | |
8465 | ||
8466 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8467 | { | |
8468 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8469 | size_t len = TYPE_LENGTH (type); | |
8470 | struct cleanup *back_to; | |
8471 | ||
8472 | siginfo_data = xmalloc (len); | |
8473 | back_to = make_cleanup (xfree, siginfo_data); | |
8474 | ||
8475 | if (target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8476 | siginfo_data, 0, len) == len) | |
8477 | discard_cleanups (back_to); | |
8478 | else | |
8479 | { | |
8480 | /* Errors ignored. */ | |
8481 | do_cleanups (back_to); | |
8482 | siginfo_data = NULL; | |
8483 | } | |
8484 | } | |
8485 | ||
41bf6aca | 8486 | inf_state = XCNEW (struct infcall_suspend_state); |
1736ad11 JK |
8487 | |
8488 | if (siginfo_data) | |
8489 | { | |
8490 | inf_state->siginfo_gdbarch = gdbarch; | |
8491 | inf_state->siginfo_data = siginfo_data; | |
8492 | } | |
b89667eb | 8493 | |
16c381f0 | 8494 | inf_state->thread_suspend = tp->suspend; |
16c381f0 | 8495 | |
35515841 | 8496 | /* run_inferior_call will not use the signal due to its `proceed' call with |
a493e3e2 PA |
8497 | GDB_SIGNAL_0 anyway. */ |
8498 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
35515841 | 8499 | |
b89667eb DE |
8500 | inf_state->stop_pc = stop_pc; |
8501 | ||
1736ad11 | 8502 | inf_state->registers = regcache_dup (regcache); |
b89667eb DE |
8503 | |
8504 | return inf_state; | |
8505 | } | |
8506 | ||
8507 | /* Restore inferior session state to INF_STATE. */ | |
8508 | ||
8509 | void | |
16c381f0 | 8510 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8511 | { |
8512 | struct thread_info *tp = inferior_thread (); | |
1736ad11 JK |
8513 | struct regcache *regcache = get_current_regcache (); |
8514 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
b89667eb | 8515 | |
16c381f0 | 8516 | tp->suspend = inf_state->thread_suspend; |
16c381f0 | 8517 | |
b89667eb DE |
8518 | stop_pc = inf_state->stop_pc; |
8519 | ||
1736ad11 JK |
8520 | if (inf_state->siginfo_gdbarch == gdbarch) |
8521 | { | |
8522 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
1736ad11 JK |
8523 | |
8524 | /* Errors ignored. */ | |
8525 | target_write (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6acef6cd | 8526 | inf_state->siginfo_data, 0, TYPE_LENGTH (type)); |
1736ad11 JK |
8527 | } |
8528 | ||
b89667eb DE |
8529 | /* The inferior can be gone if the user types "print exit(0)" |
8530 | (and perhaps other times). */ | |
8531 | if (target_has_execution) | |
8532 | /* NB: The register write goes through to the target. */ | |
1736ad11 | 8533 | regcache_cpy (regcache, inf_state->registers); |
803b5f95 | 8534 | |
16c381f0 | 8535 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8536 | } |
8537 | ||
8538 | static void | |
16c381f0 | 8539 | do_restore_infcall_suspend_state_cleanup (void *state) |
b89667eb | 8540 | { |
16c381f0 | 8541 | restore_infcall_suspend_state (state); |
b89667eb DE |
8542 | } |
8543 | ||
8544 | struct cleanup * | |
16c381f0 JK |
8545 | make_cleanup_restore_infcall_suspend_state |
8546 | (struct infcall_suspend_state *inf_state) | |
b89667eb | 8547 | { |
16c381f0 | 8548 | return make_cleanup (do_restore_infcall_suspend_state_cleanup, inf_state); |
b89667eb DE |
8549 | } |
8550 | ||
8551 | void | |
16c381f0 | 8552 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8553 | { |
8554 | regcache_xfree (inf_state->registers); | |
803b5f95 | 8555 | xfree (inf_state->siginfo_data); |
b89667eb DE |
8556 | xfree (inf_state); |
8557 | } | |
8558 | ||
8559 | struct regcache * | |
16c381f0 | 8560 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8561 | { |
8562 | return inf_state->registers; | |
8563 | } | |
8564 | ||
16c381f0 JK |
8565 | /* infcall_control_state contains state regarding gdb's control of the |
8566 | inferior itself like stepping control. It also contains session state like | |
8567 | the user's currently selected frame. */ | |
b89667eb | 8568 | |
16c381f0 | 8569 | struct infcall_control_state |
b89667eb | 8570 | { |
16c381f0 JK |
8571 | struct thread_control_state thread_control; |
8572 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
8573 | |
8574 | /* Other fields: */ | |
8575 | enum stop_stack_kind stop_stack_dummy; | |
8576 | int stopped_by_random_signal; | |
7a292a7a | 8577 | int stop_after_trap; |
7a292a7a | 8578 | |
b89667eb | 8579 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe | 8580 | struct frame_id selected_frame_id; |
7a292a7a SS |
8581 | }; |
8582 | ||
c906108c | 8583 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 8584 | connection. */ |
c906108c | 8585 | |
16c381f0 JK |
8586 | struct infcall_control_state * |
8587 | save_infcall_control_state (void) | |
c906108c | 8588 | { |
8d749320 SM |
8589 | struct infcall_control_state *inf_status = |
8590 | XNEW (struct infcall_control_state); | |
4e1c45ea | 8591 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8592 | struct inferior *inf = current_inferior (); |
7a292a7a | 8593 | |
16c381f0 JK |
8594 | inf_status->thread_control = tp->control; |
8595 | inf_status->inferior_control = inf->control; | |
d82142e2 | 8596 | |
8358c15c | 8597 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 8598 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 8599 | |
16c381f0 JK |
8600 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
8601 | chain. If caller's caller is walking the chain, they'll be happier if we | |
8602 | hand them back the original chain when restore_infcall_control_state is | |
8603 | called. */ | |
8604 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
8605 | |
8606 | /* Other fields: */ | |
8607 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
8608 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
8609 | inf_status->stop_after_trap = stop_after_trap; | |
c5aa993b | 8610 | |
206415a3 | 8611 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 8612 | |
7a292a7a | 8613 | return inf_status; |
c906108c SS |
8614 | } |
8615 | ||
c906108c | 8616 | static int |
96baa820 | 8617 | restore_selected_frame (void *args) |
c906108c | 8618 | { |
488f131b | 8619 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 8620 | struct frame_info *frame; |
c906108c | 8621 | |
101dcfbe | 8622 | frame = frame_find_by_id (*fid); |
c906108c | 8623 | |
aa0cd9c1 AC |
8624 | /* If inf_status->selected_frame_id is NULL, there was no previously |
8625 | selected frame. */ | |
101dcfbe | 8626 | if (frame == NULL) |
c906108c | 8627 | { |
8a3fe4f8 | 8628 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
8629 | return 0; |
8630 | } | |
8631 | ||
0f7d239c | 8632 | select_frame (frame); |
c906108c SS |
8633 | |
8634 | return (1); | |
8635 | } | |
8636 | ||
b89667eb DE |
8637 | /* Restore inferior session state to INF_STATUS. */ |
8638 | ||
c906108c | 8639 | void |
16c381f0 | 8640 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 8641 | { |
4e1c45ea | 8642 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8643 | struct inferior *inf = current_inferior (); |
4e1c45ea | 8644 | |
8358c15c JK |
8645 | if (tp->control.step_resume_breakpoint) |
8646 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
8647 | ||
5b79abe7 TT |
8648 | if (tp->control.exception_resume_breakpoint) |
8649 | tp->control.exception_resume_breakpoint->disposition | |
8650 | = disp_del_at_next_stop; | |
8651 | ||
d82142e2 | 8652 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 8653 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 8654 | |
16c381f0 JK |
8655 | tp->control = inf_status->thread_control; |
8656 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
8657 | |
8658 | /* Other fields: */ | |
8659 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
8660 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
8661 | stop_after_trap = inf_status->stop_after_trap; | |
c906108c | 8662 | |
b89667eb | 8663 | if (target_has_stack) |
c906108c | 8664 | { |
c906108c | 8665 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
8666 | walking the stack might encounter a garbage pointer and |
8667 | error() trying to dereference it. */ | |
488f131b JB |
8668 | if (catch_errors |
8669 | (restore_selected_frame, &inf_status->selected_frame_id, | |
8670 | "Unable to restore previously selected frame:\n", | |
8671 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
8672 | /* Error in restoring the selected frame. Select the innermost |
8673 | frame. */ | |
0f7d239c | 8674 | select_frame (get_current_frame ()); |
c906108c | 8675 | } |
c906108c | 8676 | |
72cec141 | 8677 | xfree (inf_status); |
7a292a7a | 8678 | } |
c906108c | 8679 | |
74b7792f | 8680 | static void |
16c381f0 | 8681 | do_restore_infcall_control_state_cleanup (void *sts) |
74b7792f | 8682 | { |
16c381f0 | 8683 | restore_infcall_control_state (sts); |
74b7792f AC |
8684 | } |
8685 | ||
8686 | struct cleanup * | |
16c381f0 JK |
8687 | make_cleanup_restore_infcall_control_state |
8688 | (struct infcall_control_state *inf_status) | |
74b7792f | 8689 | { |
16c381f0 | 8690 | return make_cleanup (do_restore_infcall_control_state_cleanup, inf_status); |
74b7792f AC |
8691 | } |
8692 | ||
c906108c | 8693 | void |
16c381f0 | 8694 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 8695 | { |
8358c15c JK |
8696 | if (inf_status->thread_control.step_resume_breakpoint) |
8697 | inf_status->thread_control.step_resume_breakpoint->disposition | |
8698 | = disp_del_at_next_stop; | |
8699 | ||
5b79abe7 TT |
8700 | if (inf_status->thread_control.exception_resume_breakpoint) |
8701 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
8702 | = disp_del_at_next_stop; | |
8703 | ||
1777feb0 | 8704 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 8705 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 8706 | |
72cec141 | 8707 | xfree (inf_status); |
7a292a7a | 8708 | } |
b89667eb | 8709 | \f |
ca6724c1 KB |
8710 | /* restore_inferior_ptid() will be used by the cleanup machinery |
8711 | to restore the inferior_ptid value saved in a call to | |
8712 | save_inferior_ptid(). */ | |
ce696e05 KB |
8713 | |
8714 | static void | |
8715 | restore_inferior_ptid (void *arg) | |
8716 | { | |
8717 | ptid_t *saved_ptid_ptr = arg; | |
abbb1732 | 8718 | |
ce696e05 KB |
8719 | inferior_ptid = *saved_ptid_ptr; |
8720 | xfree (arg); | |
8721 | } | |
8722 | ||
8723 | /* Save the value of inferior_ptid so that it may be restored by a | |
8724 | later call to do_cleanups(). Returns the struct cleanup pointer | |
8725 | needed for later doing the cleanup. */ | |
8726 | ||
8727 | struct cleanup * | |
8728 | save_inferior_ptid (void) | |
8729 | { | |
8d749320 | 8730 | ptid_t *saved_ptid_ptr = XNEW (ptid_t); |
ce696e05 | 8731 | |
ce696e05 KB |
8732 | *saved_ptid_ptr = inferior_ptid; |
8733 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
8734 | } | |
0c557179 | 8735 | |
7f89fd65 | 8736 | /* See infrun.h. */ |
0c557179 SDJ |
8737 | |
8738 | void | |
8739 | clear_exit_convenience_vars (void) | |
8740 | { | |
8741 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
8742 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
8743 | } | |
c5aa993b | 8744 | \f |
488f131b | 8745 | |
b2175913 MS |
8746 | /* User interface for reverse debugging: |
8747 | Set exec-direction / show exec-direction commands | |
8748 | (returns error unless target implements to_set_exec_direction method). */ | |
8749 | ||
32231432 | 8750 | int execution_direction = EXEC_FORWARD; |
b2175913 MS |
8751 | static const char exec_forward[] = "forward"; |
8752 | static const char exec_reverse[] = "reverse"; | |
8753 | static const char *exec_direction = exec_forward; | |
40478521 | 8754 | static const char *const exec_direction_names[] = { |
b2175913 MS |
8755 | exec_forward, |
8756 | exec_reverse, | |
8757 | NULL | |
8758 | }; | |
8759 | ||
8760 | static void | |
8761 | set_exec_direction_func (char *args, int from_tty, | |
8762 | struct cmd_list_element *cmd) | |
8763 | { | |
8764 | if (target_can_execute_reverse) | |
8765 | { | |
8766 | if (!strcmp (exec_direction, exec_forward)) | |
8767 | execution_direction = EXEC_FORWARD; | |
8768 | else if (!strcmp (exec_direction, exec_reverse)) | |
8769 | execution_direction = EXEC_REVERSE; | |
8770 | } | |
8bbed405 MS |
8771 | else |
8772 | { | |
8773 | exec_direction = exec_forward; | |
8774 | error (_("Target does not support this operation.")); | |
8775 | } | |
b2175913 MS |
8776 | } |
8777 | ||
8778 | static void | |
8779 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
8780 | struct cmd_list_element *cmd, const char *value) | |
8781 | { | |
8782 | switch (execution_direction) { | |
8783 | case EXEC_FORWARD: | |
8784 | fprintf_filtered (out, _("Forward.\n")); | |
8785 | break; | |
8786 | case EXEC_REVERSE: | |
8787 | fprintf_filtered (out, _("Reverse.\n")); | |
8788 | break; | |
b2175913 | 8789 | default: |
d8b34453 PA |
8790 | internal_error (__FILE__, __LINE__, |
8791 | _("bogus execution_direction value: %d"), | |
8792 | (int) execution_direction); | |
b2175913 MS |
8793 | } |
8794 | } | |
8795 | ||
d4db2f36 PA |
8796 | static void |
8797 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
8798 | struct cmd_list_element *c, const char *value) | |
8799 | { | |
3e43a32a MS |
8800 | fprintf_filtered (file, _("Resuming the execution of threads " |
8801 | "of all processes is %s.\n"), value); | |
d4db2f36 | 8802 | } |
ad52ddc6 | 8803 | |
22d2b532 SDJ |
8804 | /* Implementation of `siginfo' variable. */ |
8805 | ||
8806 | static const struct internalvar_funcs siginfo_funcs = | |
8807 | { | |
8808 | siginfo_make_value, | |
8809 | NULL, | |
8810 | NULL | |
8811 | }; | |
8812 | ||
372316f1 PA |
8813 | /* Callback for infrun's target events source. This is marked when a |
8814 | thread has a pending status to process. */ | |
8815 | ||
8816 | static void | |
8817 | infrun_async_inferior_event_handler (gdb_client_data data) | |
8818 | { | |
8819 | /* If the target is closed while this event source is marked, we | |
8820 | will reach here without execution, or a target to call | |
8821 | target_wait on, which is an error. Instead of tracking whether | |
8822 | the target has been popped already, or whether we do have threads | |
8823 | with pending statutes, simply ignore the event. */ | |
8824 | if (!target_is_async_p ()) | |
8825 | return; | |
8826 | ||
8827 | inferior_event_handler (INF_REG_EVENT, NULL); | |
8828 | } | |
8829 | ||
c906108c | 8830 | void |
96baa820 | 8831 | _initialize_infrun (void) |
c906108c | 8832 | { |
52f0bd74 AC |
8833 | int i; |
8834 | int numsigs; | |
de0bea00 | 8835 | struct cmd_list_element *c; |
c906108c | 8836 | |
372316f1 PA |
8837 | /* Register extra event sources in the event loop. */ |
8838 | infrun_async_inferior_event_token | |
8839 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
8840 | ||
1bedd215 AC |
8841 | add_info ("signals", signals_info, _("\ |
8842 | What debugger does when program gets various signals.\n\ | |
8843 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
8844 | add_info_alias ("handle", "signals", 0); |
8845 | ||
de0bea00 | 8846 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 8847 | Specify how to handle signals.\n\ |
486c7739 | 8848 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 8849 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 8850 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
8851 | will be displayed instead.\n\ |
8852 | \n\ | |
c906108c SS |
8853 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
8854 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
8855 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
8856 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 8857 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 8858 | \n\ |
1bedd215 | 8859 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
8860 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
8861 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
8862 | Print means print a message if this signal happens.\n\ | |
8863 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
8864 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
8865 | Pass and Stop may be combined.\n\ |
8866 | \n\ | |
8867 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
8868 | may be interspersed with actions, with the actions being performed for\n\ | |
8869 | all signals cumulatively specified.")); | |
de0bea00 | 8870 | set_cmd_completer (c, handle_completer); |
486c7739 | 8871 | |
c906108c | 8872 | if (!dbx_commands) |
1a966eab AC |
8873 | stop_command = add_cmd ("stop", class_obscure, |
8874 | not_just_help_class_command, _("\ | |
8875 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 8876 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 8877 | of the program stops."), &cmdlist); |
c906108c | 8878 | |
ccce17b0 | 8879 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
8880 | Set inferior debugging."), _("\ |
8881 | Show inferior debugging."), _("\ | |
8882 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
8883 | NULL, |
8884 | show_debug_infrun, | |
8885 | &setdebuglist, &showdebuglist); | |
527159b7 | 8886 | |
3e43a32a MS |
8887 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
8888 | &debug_displaced, _("\ | |
237fc4c9 PA |
8889 | Set displaced stepping debugging."), _("\ |
8890 | Show displaced stepping debugging."), _("\ | |
8891 | When non-zero, displaced stepping specific debugging is enabled."), | |
8892 | NULL, | |
8893 | show_debug_displaced, | |
8894 | &setdebuglist, &showdebuglist); | |
8895 | ||
ad52ddc6 PA |
8896 | add_setshow_boolean_cmd ("non-stop", no_class, |
8897 | &non_stop_1, _("\ | |
8898 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
8899 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
8900 | When debugging a multi-threaded program and this setting is\n\ | |
8901 | off (the default, also called all-stop mode), when one thread stops\n\ | |
8902 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
8903 | all other threads in the program while you interact with the thread of\n\ | |
8904 | interest. When you continue or step a thread, you can allow the other\n\ | |
8905 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
8906 | thread's state, all threads stop.\n\ | |
8907 | \n\ | |
8908 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
8909 | to run freely. You'll be able to step each thread independently,\n\ | |
8910 | leave it stopped or free to run as needed."), | |
8911 | set_non_stop, | |
8912 | show_non_stop, | |
8913 | &setlist, | |
8914 | &showlist); | |
8915 | ||
a493e3e2 | 8916 | numsigs = (int) GDB_SIGNAL_LAST; |
8d749320 SM |
8917 | signal_stop = XNEWVEC (unsigned char, numsigs); |
8918 | signal_print = XNEWVEC (unsigned char, numsigs); | |
8919 | signal_program = XNEWVEC (unsigned char, numsigs); | |
8920 | signal_catch = XNEWVEC (unsigned char, numsigs); | |
8921 | signal_pass = XNEWVEC (unsigned char, numsigs); | |
c906108c SS |
8922 | for (i = 0; i < numsigs; i++) |
8923 | { | |
8924 | signal_stop[i] = 1; | |
8925 | signal_print[i] = 1; | |
8926 | signal_program[i] = 1; | |
ab04a2af | 8927 | signal_catch[i] = 0; |
c906108c SS |
8928 | } |
8929 | ||
4d9d9d04 PA |
8930 | /* Signals caused by debugger's own actions should not be given to |
8931 | the program afterwards. | |
8932 | ||
8933 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
8934 | explicitly specifies that it should be delivered to the target | |
8935 | program. Typically, that would occur when a user is debugging a | |
8936 | target monitor on a simulator: the target monitor sets a | |
8937 | breakpoint; the simulator encounters this breakpoint and halts | |
8938 | the simulation handing control to GDB; GDB, noting that the stop | |
8939 | address doesn't map to any known breakpoint, returns control back | |
8940 | to the simulator; the simulator then delivers the hardware | |
8941 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
8942 | debugged. */ | |
a493e3e2 PA |
8943 | signal_program[GDB_SIGNAL_TRAP] = 0; |
8944 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
8945 | |
8946 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
8947 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
8948 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
8949 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
8950 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
8951 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
8952 | signal_print[GDB_SIGNAL_PROF] = 0; | |
8953 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
8954 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
8955 | signal_stop[GDB_SIGNAL_IO] = 0; | |
8956 | signal_print[GDB_SIGNAL_IO] = 0; | |
8957 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
8958 | signal_print[GDB_SIGNAL_POLL] = 0; | |
8959 | signal_stop[GDB_SIGNAL_URG] = 0; | |
8960 | signal_print[GDB_SIGNAL_URG] = 0; | |
8961 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
8962 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
8963 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
8964 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 8965 | |
cd0fc7c3 SS |
8966 | /* These signals are used internally by user-level thread |
8967 | implementations. (See signal(5) on Solaris.) Like the above | |
8968 | signals, a healthy program receives and handles them as part of | |
8969 | its normal operation. */ | |
a493e3e2 PA |
8970 | signal_stop[GDB_SIGNAL_LWP] = 0; |
8971 | signal_print[GDB_SIGNAL_LWP] = 0; | |
8972 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
8973 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
8974 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
8975 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
cd0fc7c3 | 8976 | |
2455069d UW |
8977 | /* Update cached state. */ |
8978 | signal_cache_update (-1); | |
8979 | ||
85c07804 AC |
8980 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
8981 | &stop_on_solib_events, _("\ | |
8982 | Set stopping for shared library events."), _("\ | |
8983 | Show stopping for shared library events."), _("\ | |
c906108c SS |
8984 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
8985 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 8986 | to the user would be loading/unloading of a new library."), |
f9e14852 | 8987 | set_stop_on_solib_events, |
920d2a44 | 8988 | show_stop_on_solib_events, |
85c07804 | 8989 | &setlist, &showlist); |
c906108c | 8990 | |
7ab04401 AC |
8991 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
8992 | follow_fork_mode_kind_names, | |
8993 | &follow_fork_mode_string, _("\ | |
8994 | Set debugger response to a program call of fork or vfork."), _("\ | |
8995 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
8996 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
8997 | parent - the original process is debugged after a fork\n\ | |
8998 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 8999 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9000 | By default, the debugger will follow the parent process."), |
9001 | NULL, | |
920d2a44 | 9002 | show_follow_fork_mode_string, |
7ab04401 AC |
9003 | &setlist, &showlist); |
9004 | ||
6c95b8df PA |
9005 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9006 | follow_exec_mode_names, | |
9007 | &follow_exec_mode_string, _("\ | |
9008 | Set debugger response to a program call of exec."), _("\ | |
9009 | Show debugger response to a program call of exec."), _("\ | |
9010 | An exec call replaces the program image of a process.\n\ | |
9011 | \n\ | |
9012 | follow-exec-mode can be:\n\ | |
9013 | \n\ | |
cce7e648 | 9014 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9015 | to this new inferior. The program the process was running before\n\ |
9016 | the exec call can be restarted afterwards by restarting the original\n\ | |
9017 | inferior.\n\ | |
9018 | \n\ | |
9019 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9020 | The new executable image replaces the previous executable loaded in\n\ | |
9021 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9022 | the executable the process was running after the exec call.\n\ | |
9023 | \n\ | |
9024 | By default, the debugger will use the same inferior."), | |
9025 | NULL, | |
9026 | show_follow_exec_mode_string, | |
9027 | &setlist, &showlist); | |
9028 | ||
7ab04401 AC |
9029 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9030 | scheduler_enums, &scheduler_mode, _("\ | |
9031 | Set mode for locking scheduler during execution."), _("\ | |
9032 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
9033 | off == no locking (threads may preempt at any time)\n\ |
9034 | on == full locking (no thread except the current thread may run)\n\ | |
856e7dd6 PA |
9035 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ |
9036 | In this mode, other threads may run during other commands."), | |
7ab04401 | 9037 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9038 | show_scheduler_mode, |
7ab04401 | 9039 | &setlist, &showlist); |
5fbbeb29 | 9040 | |
d4db2f36 PA |
9041 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9042 | Set mode for resuming threads of all processes."), _("\ | |
9043 | Show mode for resuming threads of all processes."), _("\ | |
9044 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9045 | threads of all processes. When off (which is the default), execution\n\ | |
9046 | commands only resume the threads of the current process. The set of\n\ | |
9047 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9048 | mode (see help set scheduler-locking)."), | |
9049 | NULL, | |
9050 | show_schedule_multiple, | |
9051 | &setlist, &showlist); | |
9052 | ||
5bf193a2 AC |
9053 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9054 | Set mode of the step operation."), _("\ | |
9055 | Show mode of the step operation."), _("\ | |
9056 | When set, doing a step over a function without debug line information\n\ | |
9057 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9058 | function is skipped and the step command stops at a different source line."), | |
9059 | NULL, | |
920d2a44 | 9060 | show_step_stop_if_no_debug, |
5bf193a2 | 9061 | &setlist, &showlist); |
ca6724c1 | 9062 | |
72d0e2c5 YQ |
9063 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9064 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9065 | Set debugger's willingness to use displaced stepping."), _("\ |
9066 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9067 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9068 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9069 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9070 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9071 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9072 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9073 | NULL, |
9074 | show_can_use_displaced_stepping, | |
9075 | &setlist, &showlist); | |
237fc4c9 | 9076 | |
b2175913 MS |
9077 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9078 | &exec_direction, _("Set direction of execution.\n\ | |
9079 | Options are 'forward' or 'reverse'."), | |
9080 | _("Show direction of execution (forward/reverse)."), | |
9081 | _("Tells gdb whether to execute forward or backward."), | |
9082 | set_exec_direction_func, show_exec_direction_func, | |
9083 | &setlist, &showlist); | |
9084 | ||
6c95b8df PA |
9085 | /* Set/show detach-on-fork: user-settable mode. */ |
9086 | ||
9087 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9088 | Set whether gdb will detach the child of a fork."), _("\ | |
9089 | Show whether gdb will detach the child of a fork."), _("\ | |
9090 | Tells gdb whether to detach the child of a fork."), | |
9091 | NULL, NULL, &setlist, &showlist); | |
9092 | ||
03583c20 UW |
9093 | /* Set/show disable address space randomization mode. */ |
9094 | ||
9095 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9096 | &disable_randomization, _("\ | |
9097 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9098 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9099 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9100 | address space is disabled. Standalone programs run with the randomization\n\ | |
9101 | enabled by default on some platforms."), | |
9102 | &set_disable_randomization, | |
9103 | &show_disable_randomization, | |
9104 | &setlist, &showlist); | |
9105 | ||
ca6724c1 | 9106 | /* ptid initializations */ |
ca6724c1 KB |
9107 | inferior_ptid = null_ptid; |
9108 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd PA |
9109 | |
9110 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 9111 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 9112 | observer_attach_thread_exit (infrun_thread_thread_exit); |
fc1cf338 | 9113 | observer_attach_inferior_exit (infrun_inferior_exit); |
4aa995e1 PA |
9114 | |
9115 | /* Explicitly create without lookup, since that tries to create a | |
9116 | value with a void typed value, and when we get here, gdbarch | |
9117 | isn't initialized yet. At this point, we're quite sure there | |
9118 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9119 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9120 | |
9121 | add_setshow_boolean_cmd ("observer", no_class, | |
9122 | &observer_mode_1, _("\ | |
9123 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9124 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9125 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9126 | affect its execution. Registers and memory may not be changed,\n\ | |
9127 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9128 | or signalled."), | |
9129 | set_observer_mode, | |
9130 | show_observer_mode, | |
9131 | &setlist, | |
9132 | &showlist); | |
c906108c | 9133 | } |