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" |
c906108c SS |
63 | |
64 | /* Prototypes for local functions */ | |
65 | ||
96baa820 | 66 | static void signals_info (char *, int); |
c906108c | 67 | |
96baa820 | 68 | static void handle_command (char *, int); |
c906108c | 69 | |
2ea28649 | 70 | static void sig_print_info (enum gdb_signal); |
c906108c | 71 | |
96baa820 | 72 | static void sig_print_header (void); |
c906108c | 73 | |
74b7792f | 74 | static void resume_cleanups (void *); |
c906108c | 75 | |
96baa820 | 76 | static int hook_stop_stub (void *); |
c906108c | 77 | |
96baa820 JM |
78 | static int restore_selected_frame (void *); |
79 | ||
4ef3f3be | 80 | static int follow_fork (void); |
96baa820 | 81 | |
d83ad864 DB |
82 | static int follow_fork_inferior (int follow_child, int detach_fork); |
83 | ||
84 | static void follow_inferior_reset_breakpoints (void); | |
85 | ||
96baa820 | 86 | static void set_schedlock_func (char *args, int from_tty, |
488f131b | 87 | struct cmd_list_element *c); |
96baa820 | 88 | |
a289b8f6 JK |
89 | static int currently_stepping (struct thread_info *tp); |
90 | ||
96baa820 JM |
91 | static void xdb_handle_command (char *args, int from_tty); |
92 | ||
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 | ||
5fbbeb29 CF |
103 | /* When set, stop the 'step' command if we enter a function which has |
104 | no line number information. The normal behavior is that we step | |
105 | over such function. */ | |
106 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
107 | static void |
108 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
109 | struct cmd_list_element *c, const char *value) | |
110 | { | |
111 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
112 | } | |
5fbbeb29 | 113 | |
1777feb0 | 114 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 115 | |
43ff13b4 JM |
116 | int sync_execution = 0; |
117 | ||
b9f437de PA |
118 | /* proceed and normal_stop use this to notify the user when the |
119 | inferior stopped in a different thread than it had been running | |
120 | in. */ | |
96baa820 | 121 | |
39f77062 | 122 | static ptid_t previous_inferior_ptid; |
7a292a7a | 123 | |
07107ca6 LM |
124 | /* If set (default for legacy reasons), when following a fork, GDB |
125 | will detach from one of the fork branches, child or parent. | |
126 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
127 | setting. */ | |
128 | ||
129 | static int detach_fork = 1; | |
6c95b8df | 130 | |
237fc4c9 PA |
131 | int debug_displaced = 0; |
132 | static void | |
133 | show_debug_displaced (struct ui_file *file, int from_tty, | |
134 | struct cmd_list_element *c, const char *value) | |
135 | { | |
136 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
137 | } | |
138 | ||
ccce17b0 | 139 | unsigned int debug_infrun = 0; |
920d2a44 AC |
140 | static void |
141 | show_debug_infrun (struct ui_file *file, int from_tty, | |
142 | struct cmd_list_element *c, const char *value) | |
143 | { | |
144 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
145 | } | |
527159b7 | 146 | |
03583c20 UW |
147 | |
148 | /* Support for disabling address space randomization. */ | |
149 | ||
150 | int disable_randomization = 1; | |
151 | ||
152 | static void | |
153 | show_disable_randomization (struct ui_file *file, int from_tty, | |
154 | struct cmd_list_element *c, const char *value) | |
155 | { | |
156 | if (target_supports_disable_randomization ()) | |
157 | fprintf_filtered (file, | |
158 | _("Disabling randomization of debuggee's " | |
159 | "virtual address space is %s.\n"), | |
160 | value); | |
161 | else | |
162 | fputs_filtered (_("Disabling randomization of debuggee's " | |
163 | "virtual address space is unsupported on\n" | |
164 | "this platform.\n"), file); | |
165 | } | |
166 | ||
167 | static void | |
168 | set_disable_randomization (char *args, int from_tty, | |
169 | struct cmd_list_element *c) | |
170 | { | |
171 | if (!target_supports_disable_randomization ()) | |
172 | error (_("Disabling randomization of debuggee's " | |
173 | "virtual address space is unsupported on\n" | |
174 | "this platform.")); | |
175 | } | |
176 | ||
d32dc48e PA |
177 | /* User interface for non-stop mode. */ |
178 | ||
179 | int non_stop = 0; | |
180 | static int non_stop_1 = 0; | |
181 | ||
182 | static void | |
183 | set_non_stop (char *args, int from_tty, | |
184 | struct cmd_list_element *c) | |
185 | { | |
186 | if (target_has_execution) | |
187 | { | |
188 | non_stop_1 = non_stop; | |
189 | error (_("Cannot change this setting while the inferior is running.")); | |
190 | } | |
191 | ||
192 | non_stop = non_stop_1; | |
193 | } | |
194 | ||
195 | static void | |
196 | show_non_stop (struct ui_file *file, int from_tty, | |
197 | struct cmd_list_element *c, const char *value) | |
198 | { | |
199 | fprintf_filtered (file, | |
200 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
201 | value); | |
202 | } | |
203 | ||
d914c394 SS |
204 | /* "Observer mode" is somewhat like a more extreme version of |
205 | non-stop, in which all GDB operations that might affect the | |
206 | target's execution have been disabled. */ | |
207 | ||
d914c394 SS |
208 | int observer_mode = 0; |
209 | static int observer_mode_1 = 0; | |
210 | ||
211 | static void | |
212 | set_observer_mode (char *args, int from_tty, | |
213 | struct cmd_list_element *c) | |
214 | { | |
d914c394 SS |
215 | if (target_has_execution) |
216 | { | |
217 | observer_mode_1 = observer_mode; | |
218 | error (_("Cannot change this setting while the inferior is running.")); | |
219 | } | |
220 | ||
221 | observer_mode = observer_mode_1; | |
222 | ||
223 | may_write_registers = !observer_mode; | |
224 | may_write_memory = !observer_mode; | |
225 | may_insert_breakpoints = !observer_mode; | |
226 | may_insert_tracepoints = !observer_mode; | |
227 | /* We can insert fast tracepoints in or out of observer mode, | |
228 | but enable them if we're going into this mode. */ | |
229 | if (observer_mode) | |
230 | may_insert_fast_tracepoints = 1; | |
231 | may_stop = !observer_mode; | |
232 | update_target_permissions (); | |
233 | ||
234 | /* Going *into* observer mode we must force non-stop, then | |
235 | going out we leave it that way. */ | |
236 | if (observer_mode) | |
237 | { | |
d914c394 SS |
238 | pagination_enabled = 0; |
239 | non_stop = non_stop_1 = 1; | |
240 | } | |
241 | ||
242 | if (from_tty) | |
243 | printf_filtered (_("Observer mode is now %s.\n"), | |
244 | (observer_mode ? "on" : "off")); | |
245 | } | |
246 | ||
247 | static void | |
248 | show_observer_mode (struct ui_file *file, int from_tty, | |
249 | struct cmd_list_element *c, const char *value) | |
250 | { | |
251 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
252 | } | |
253 | ||
254 | /* This updates the value of observer mode based on changes in | |
255 | permissions. Note that we are deliberately ignoring the values of | |
256 | may-write-registers and may-write-memory, since the user may have | |
257 | reason to enable these during a session, for instance to turn on a | |
258 | debugging-related global. */ | |
259 | ||
260 | void | |
261 | update_observer_mode (void) | |
262 | { | |
263 | int newval; | |
264 | ||
265 | newval = (!may_insert_breakpoints | |
266 | && !may_insert_tracepoints | |
267 | && may_insert_fast_tracepoints | |
268 | && !may_stop | |
269 | && non_stop); | |
270 | ||
271 | /* Let the user know if things change. */ | |
272 | if (newval != observer_mode) | |
273 | printf_filtered (_("Observer mode is now %s.\n"), | |
274 | (newval ? "on" : "off")); | |
275 | ||
276 | observer_mode = observer_mode_1 = newval; | |
277 | } | |
c2c6d25f | 278 | |
c906108c SS |
279 | /* Tables of how to react to signals; the user sets them. */ |
280 | ||
281 | static unsigned char *signal_stop; | |
282 | static unsigned char *signal_print; | |
283 | static unsigned char *signal_program; | |
284 | ||
ab04a2af TT |
285 | /* Table of signals that are registered with "catch signal". A |
286 | non-zero entry indicates that the signal is caught by some "catch | |
287 | signal" command. This has size GDB_SIGNAL_LAST, to accommodate all | |
288 | signals. */ | |
289 | static unsigned char *signal_catch; | |
290 | ||
2455069d UW |
291 | /* Table of signals that the target may silently handle. |
292 | This is automatically determined from the flags above, | |
293 | and simply cached here. */ | |
294 | static unsigned char *signal_pass; | |
295 | ||
c906108c SS |
296 | #define SET_SIGS(nsigs,sigs,flags) \ |
297 | do { \ | |
298 | int signum = (nsigs); \ | |
299 | while (signum-- > 0) \ | |
300 | if ((sigs)[signum]) \ | |
301 | (flags)[signum] = 1; \ | |
302 | } while (0) | |
303 | ||
304 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
305 | do { \ | |
306 | int signum = (nsigs); \ | |
307 | while (signum-- > 0) \ | |
308 | if ((sigs)[signum]) \ | |
309 | (flags)[signum] = 0; \ | |
310 | } while (0) | |
311 | ||
9b224c5e PA |
312 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
313 | this function is to avoid exporting `signal_program'. */ | |
314 | ||
315 | void | |
316 | update_signals_program_target (void) | |
317 | { | |
a493e3e2 | 318 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); |
9b224c5e PA |
319 | } |
320 | ||
1777feb0 | 321 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 322 | |
edb3359d | 323 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
324 | |
325 | /* Command list pointer for the "stop" placeholder. */ | |
326 | ||
327 | static struct cmd_list_element *stop_command; | |
328 | ||
c906108c SS |
329 | /* Nonzero if we want to give control to the user when we're notified |
330 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 331 | int stop_on_solib_events; |
f9e14852 GB |
332 | |
333 | /* Enable or disable optional shared library event breakpoints | |
334 | as appropriate when the above flag is changed. */ | |
335 | ||
336 | static void | |
337 | set_stop_on_solib_events (char *args, int from_tty, struct cmd_list_element *c) | |
338 | { | |
339 | update_solib_breakpoints (); | |
340 | } | |
341 | ||
920d2a44 AC |
342 | static void |
343 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
344 | struct cmd_list_element *c, const char *value) | |
345 | { | |
346 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
347 | value); | |
348 | } | |
c906108c | 349 | |
c906108c SS |
350 | /* Nonzero means expecting a trace trap |
351 | and should stop the inferior and return silently when it happens. */ | |
352 | ||
353 | int stop_after_trap; | |
354 | ||
642fd101 DE |
355 | /* Save register contents here when executing a "finish" command or are |
356 | about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set. | |
c906108c SS |
357 | Thus this contains the return value from the called function (assuming |
358 | values are returned in a register). */ | |
359 | ||
72cec141 | 360 | struct regcache *stop_registers; |
c906108c | 361 | |
c906108c SS |
362 | /* Nonzero after stop if current stack frame should be printed. */ |
363 | ||
364 | static int stop_print_frame; | |
365 | ||
e02bc4cc | 366 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
367 | returned by target_wait()/deprecated_target_wait_hook(). This |
368 | information is returned by get_last_target_status(). */ | |
39f77062 | 369 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
370 | static struct target_waitstatus target_last_waitstatus; |
371 | ||
0d1e5fa7 PA |
372 | static void context_switch (ptid_t ptid); |
373 | ||
4e1c45ea | 374 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 375 | |
53904c9e AC |
376 | static const char follow_fork_mode_child[] = "child"; |
377 | static const char follow_fork_mode_parent[] = "parent"; | |
378 | ||
40478521 | 379 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
380 | follow_fork_mode_child, |
381 | follow_fork_mode_parent, | |
382 | NULL | |
ef346e04 | 383 | }; |
c906108c | 384 | |
53904c9e | 385 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
386 | static void |
387 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
388 | struct cmd_list_element *c, const char *value) | |
389 | { | |
3e43a32a MS |
390 | fprintf_filtered (file, |
391 | _("Debugger response to a program " | |
392 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
393 | value); |
394 | } | |
c906108c SS |
395 | \f |
396 | ||
d83ad864 DB |
397 | /* Handle changes to the inferior list based on the type of fork, |
398 | which process is being followed, and whether the other process | |
399 | should be detached. On entry inferior_ptid must be the ptid of | |
400 | the fork parent. At return inferior_ptid is the ptid of the | |
401 | followed inferior. */ | |
402 | ||
403 | static int | |
404 | follow_fork_inferior (int follow_child, int detach_fork) | |
405 | { | |
406 | int has_vforked; | |
79639e11 | 407 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
408 | |
409 | has_vforked = (inferior_thread ()->pending_follow.kind | |
410 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
411 | parent_ptid = inferior_ptid; |
412 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
413 | |
414 | if (has_vforked | |
415 | && !non_stop /* Non-stop always resumes both branches. */ | |
416 | && (!target_is_async_p () || sync_execution) | |
417 | && !(follow_child || detach_fork || sched_multi)) | |
418 | { | |
419 | /* The parent stays blocked inside the vfork syscall until the | |
420 | child execs or exits. If we don't let the child run, then | |
421 | the parent stays blocked. If we're telling the parent to run | |
422 | in the foreground, the user will not be able to ctrl-c to get | |
423 | back the terminal, effectively hanging the debug session. */ | |
424 | fprintf_filtered (gdb_stderr, _("\ | |
425 | Can not resume the parent process over vfork in the foreground while\n\ | |
426 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
427 | \"set schedule-multiple\".\n")); | |
428 | /* FIXME output string > 80 columns. */ | |
429 | return 1; | |
430 | } | |
431 | ||
432 | if (!follow_child) | |
433 | { | |
434 | /* Detach new forked process? */ | |
435 | if (detach_fork) | |
436 | { | |
437 | struct cleanup *old_chain; | |
438 | ||
439 | /* Before detaching from the child, remove all breakpoints | |
440 | from it. If we forked, then this has already been taken | |
441 | care of by infrun.c. If we vforked however, any | |
442 | breakpoint inserted in the parent is visible in the | |
443 | child, even those added while stopped in a vfork | |
444 | catchpoint. This will remove the breakpoints from the | |
445 | parent also, but they'll be reinserted below. */ | |
446 | if (has_vforked) | |
447 | { | |
448 | /* Keep breakpoints list in sync. */ | |
449 | remove_breakpoints_pid (ptid_get_pid (inferior_ptid)); | |
450 | } | |
451 | ||
452 | if (info_verbose || debug_infrun) | |
453 | { | |
6f259a23 | 454 | target_terminal_ours_for_output (); |
d83ad864 | 455 | fprintf_filtered (gdb_stdlog, |
79639e11 | 456 | _("Detaching after %s from child %s.\n"), |
6f259a23 | 457 | has_vforked ? "vfork" : "fork", |
79639e11 | 458 | target_pid_to_str (child_ptid)); |
d83ad864 DB |
459 | } |
460 | } | |
461 | else | |
462 | { | |
463 | struct inferior *parent_inf, *child_inf; | |
464 | struct cleanup *old_chain; | |
465 | ||
466 | /* Add process to GDB's tables. */ | |
79639e11 | 467 | child_inf = add_inferior (ptid_get_pid (child_ptid)); |
d83ad864 DB |
468 | |
469 | parent_inf = current_inferior (); | |
470 | child_inf->attach_flag = parent_inf->attach_flag; | |
471 | copy_terminal_info (child_inf, parent_inf); | |
472 | child_inf->gdbarch = parent_inf->gdbarch; | |
473 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
474 | ||
475 | old_chain = save_inferior_ptid (); | |
476 | save_current_program_space (); | |
477 | ||
79639e11 | 478 | inferior_ptid = child_ptid; |
d83ad864 DB |
479 | add_thread (inferior_ptid); |
480 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
481 | ||
482 | /* If this is a vfork child, then the address-space is | |
483 | shared with the parent. */ | |
484 | if (has_vforked) | |
485 | { | |
486 | child_inf->pspace = parent_inf->pspace; | |
487 | child_inf->aspace = parent_inf->aspace; | |
488 | ||
489 | /* The parent will be frozen until the child is done | |
490 | with the shared region. Keep track of the | |
491 | parent. */ | |
492 | child_inf->vfork_parent = parent_inf; | |
493 | child_inf->pending_detach = 0; | |
494 | parent_inf->vfork_child = child_inf; | |
495 | parent_inf->pending_detach = 0; | |
496 | } | |
497 | else | |
498 | { | |
499 | child_inf->aspace = new_address_space (); | |
500 | child_inf->pspace = add_program_space (child_inf->aspace); | |
501 | child_inf->removable = 1; | |
502 | set_current_program_space (child_inf->pspace); | |
503 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
504 | ||
505 | /* Let the shared library layer (e.g., solib-svr4) learn | |
506 | about this new process, relocate the cloned exec, pull | |
507 | in shared libraries, and install the solib event | |
508 | breakpoint. If a "cloned-VM" event was propagated | |
509 | better throughout the core, this wouldn't be | |
510 | required. */ | |
511 | solib_create_inferior_hook (0); | |
512 | } | |
513 | ||
514 | do_cleanups (old_chain); | |
515 | } | |
516 | ||
517 | if (has_vforked) | |
518 | { | |
519 | struct inferior *parent_inf; | |
520 | ||
521 | parent_inf = current_inferior (); | |
522 | ||
523 | /* If we detached from the child, then we have to be careful | |
524 | to not insert breakpoints in the parent until the child | |
525 | is done with the shared memory region. However, if we're | |
526 | staying attached to the child, then we can and should | |
527 | insert breakpoints, so that we can debug it. A | |
528 | subsequent child exec or exit is enough to know when does | |
529 | the child stops using the parent's address space. */ | |
530 | parent_inf->waiting_for_vfork_done = detach_fork; | |
531 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
532 | } | |
533 | } | |
534 | else | |
535 | { | |
536 | /* Follow the child. */ | |
537 | struct inferior *parent_inf, *child_inf; | |
538 | struct program_space *parent_pspace; | |
539 | ||
540 | if (info_verbose || debug_infrun) | |
541 | { | |
6f259a23 DB |
542 | target_terminal_ours_for_output (); |
543 | fprintf_filtered (gdb_stdlog, | |
79639e11 PA |
544 | _("Attaching after %s %s to child %s.\n"), |
545 | target_pid_to_str (parent_ptid), | |
6f259a23 | 546 | has_vforked ? "vfork" : "fork", |
79639e11 | 547 | target_pid_to_str (child_ptid)); |
d83ad864 DB |
548 | } |
549 | ||
550 | /* Add the new inferior first, so that the target_detach below | |
551 | doesn't unpush the target. */ | |
552 | ||
79639e11 | 553 | child_inf = add_inferior (ptid_get_pid (child_ptid)); |
d83ad864 DB |
554 | |
555 | parent_inf = current_inferior (); | |
556 | child_inf->attach_flag = parent_inf->attach_flag; | |
557 | copy_terminal_info (child_inf, parent_inf); | |
558 | child_inf->gdbarch = parent_inf->gdbarch; | |
559 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
560 | ||
561 | parent_pspace = parent_inf->pspace; | |
562 | ||
563 | /* If we're vforking, we want to hold on to the parent until the | |
564 | child exits or execs. At child exec or exit time we can | |
565 | remove the old breakpoints from the parent and detach or | |
566 | resume debugging it. Otherwise, detach the parent now; we'll | |
567 | want to reuse it's program/address spaces, but we can't set | |
568 | them to the child before removing breakpoints from the | |
569 | parent, otherwise, the breakpoints module could decide to | |
570 | remove breakpoints from the wrong process (since they'd be | |
571 | assigned to the same address space). */ | |
572 | ||
573 | if (has_vforked) | |
574 | { | |
575 | gdb_assert (child_inf->vfork_parent == NULL); | |
576 | gdb_assert (parent_inf->vfork_child == NULL); | |
577 | child_inf->vfork_parent = parent_inf; | |
578 | child_inf->pending_detach = 0; | |
579 | parent_inf->vfork_child = child_inf; | |
580 | parent_inf->pending_detach = detach_fork; | |
581 | parent_inf->waiting_for_vfork_done = 0; | |
582 | } | |
583 | else if (detach_fork) | |
6f259a23 DB |
584 | { |
585 | if (info_verbose || debug_infrun) | |
586 | { | |
587 | target_terminal_ours_for_output (); | |
588 | fprintf_filtered (gdb_stdlog, | |
589 | _("Detaching after fork from " | |
79639e11 PA |
590 | "child %s.\n"), |
591 | target_pid_to_str (child_ptid)); | |
6f259a23 DB |
592 | } |
593 | ||
594 | target_detach (NULL, 0); | |
595 | } | |
d83ad864 DB |
596 | |
597 | /* Note that the detach above makes PARENT_INF dangling. */ | |
598 | ||
599 | /* Add the child thread to the appropriate lists, and switch to | |
600 | this new thread, before cloning the program space, and | |
601 | informing the solib layer about this new process. */ | |
602 | ||
79639e11 | 603 | inferior_ptid = child_ptid; |
d83ad864 DB |
604 | add_thread (inferior_ptid); |
605 | ||
606 | /* If this is a vfork child, then the address-space is shared | |
607 | with the parent. If we detached from the parent, then we can | |
608 | reuse the parent's program/address spaces. */ | |
609 | if (has_vforked || detach_fork) | |
610 | { | |
611 | child_inf->pspace = parent_pspace; | |
612 | child_inf->aspace = child_inf->pspace->aspace; | |
613 | } | |
614 | else | |
615 | { | |
616 | child_inf->aspace = new_address_space (); | |
617 | child_inf->pspace = add_program_space (child_inf->aspace); | |
618 | child_inf->removable = 1; | |
619 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
620 | set_current_program_space (child_inf->pspace); | |
621 | clone_program_space (child_inf->pspace, parent_pspace); | |
622 | ||
623 | /* Let the shared library layer (e.g., solib-svr4) learn | |
624 | about this new process, relocate the cloned exec, pull in | |
625 | shared libraries, and install the solib event breakpoint. | |
626 | If a "cloned-VM" event was propagated better throughout | |
627 | the core, this wouldn't be required. */ | |
628 | solib_create_inferior_hook (0); | |
629 | } | |
630 | } | |
631 | ||
632 | return target_follow_fork (follow_child, detach_fork); | |
633 | } | |
634 | ||
e58b0e63 PA |
635 | /* Tell the target to follow the fork we're stopped at. Returns true |
636 | if the inferior should be resumed; false, if the target for some | |
637 | reason decided it's best not to resume. */ | |
638 | ||
6604731b | 639 | static int |
4ef3f3be | 640 | follow_fork (void) |
c906108c | 641 | { |
ea1dd7bc | 642 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
643 | int should_resume = 1; |
644 | struct thread_info *tp; | |
645 | ||
646 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
647 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
648 | parent thread structure's run control related fields, not just these. |
649 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
650 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 651 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
652 | CORE_ADDR step_range_start = 0; |
653 | CORE_ADDR step_range_end = 0; | |
654 | struct frame_id step_frame_id = { 0 }; | |
17b2616c | 655 | struct interp *command_interp = NULL; |
e58b0e63 PA |
656 | |
657 | if (!non_stop) | |
658 | { | |
659 | ptid_t wait_ptid; | |
660 | struct target_waitstatus wait_status; | |
661 | ||
662 | /* Get the last target status returned by target_wait(). */ | |
663 | get_last_target_status (&wait_ptid, &wait_status); | |
664 | ||
665 | /* If not stopped at a fork event, then there's nothing else to | |
666 | do. */ | |
667 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
668 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
669 | return 1; | |
670 | ||
671 | /* Check if we switched over from WAIT_PTID, since the event was | |
672 | reported. */ | |
673 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
674 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
675 | { | |
676 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
677 | target to follow it (in either direction). We'll | |
678 | afterwards refuse to resume, and inform the user what | |
679 | happened. */ | |
680 | switch_to_thread (wait_ptid); | |
681 | should_resume = 0; | |
682 | } | |
683 | } | |
684 | ||
685 | tp = inferior_thread (); | |
686 | ||
687 | /* If there were any forks/vforks that were caught and are now to be | |
688 | followed, then do so now. */ | |
689 | switch (tp->pending_follow.kind) | |
690 | { | |
691 | case TARGET_WAITKIND_FORKED: | |
692 | case TARGET_WAITKIND_VFORKED: | |
693 | { | |
694 | ptid_t parent, child; | |
695 | ||
696 | /* If the user did a next/step, etc, over a fork call, | |
697 | preserve the stepping state in the fork child. */ | |
698 | if (follow_child && should_resume) | |
699 | { | |
8358c15c JK |
700 | step_resume_breakpoint = clone_momentary_breakpoint |
701 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
702 | step_range_start = tp->control.step_range_start; |
703 | step_range_end = tp->control.step_range_end; | |
704 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
705 | exception_resume_breakpoint |
706 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
17b2616c | 707 | command_interp = tp->control.command_interp; |
e58b0e63 PA |
708 | |
709 | /* For now, delete the parent's sr breakpoint, otherwise, | |
710 | parent/child sr breakpoints are considered duplicates, | |
711 | and the child version will not be installed. Remove | |
712 | this when the breakpoints module becomes aware of | |
713 | inferiors and address spaces. */ | |
714 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
715 | tp->control.step_range_start = 0; |
716 | tp->control.step_range_end = 0; | |
717 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 718 | delete_exception_resume_breakpoint (tp); |
17b2616c | 719 | tp->control.command_interp = NULL; |
e58b0e63 PA |
720 | } |
721 | ||
722 | parent = inferior_ptid; | |
723 | child = tp->pending_follow.value.related_pid; | |
724 | ||
d83ad864 DB |
725 | /* Set up inferior(s) as specified by the caller, and tell the |
726 | target to do whatever is necessary to follow either parent | |
727 | or child. */ | |
728 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
729 | { |
730 | /* Target refused to follow, or there's some other reason | |
731 | we shouldn't resume. */ | |
732 | should_resume = 0; | |
733 | } | |
734 | else | |
735 | { | |
736 | /* This pending follow fork event is now handled, one way | |
737 | or another. The previous selected thread may be gone | |
738 | from the lists by now, but if it is still around, need | |
739 | to clear the pending follow request. */ | |
e09875d4 | 740 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
741 | if (tp) |
742 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
743 | ||
744 | /* This makes sure we don't try to apply the "Switched | |
745 | over from WAIT_PID" logic above. */ | |
746 | nullify_last_target_wait_ptid (); | |
747 | ||
1777feb0 | 748 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
749 | if (follow_child) |
750 | { | |
751 | switch_to_thread (child); | |
752 | ||
753 | /* ... and preserve the stepping state, in case the | |
754 | user was stepping over the fork call. */ | |
755 | if (should_resume) | |
756 | { | |
757 | tp = inferior_thread (); | |
8358c15c JK |
758 | tp->control.step_resume_breakpoint |
759 | = step_resume_breakpoint; | |
16c381f0 JK |
760 | tp->control.step_range_start = step_range_start; |
761 | tp->control.step_range_end = step_range_end; | |
762 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
763 | tp->control.exception_resume_breakpoint |
764 | = exception_resume_breakpoint; | |
17b2616c | 765 | tp->control.command_interp = command_interp; |
e58b0e63 PA |
766 | } |
767 | else | |
768 | { | |
769 | /* If we get here, it was because we're trying to | |
770 | resume from a fork catchpoint, but, the user | |
771 | has switched threads away from the thread that | |
772 | forked. In that case, the resume command | |
773 | issued is most likely not applicable to the | |
774 | child, so just warn, and refuse to resume. */ | |
3e43a32a MS |
775 | warning (_("Not resuming: switched threads " |
776 | "before following fork child.\n")); | |
e58b0e63 PA |
777 | } |
778 | ||
779 | /* Reset breakpoints in the child as appropriate. */ | |
780 | follow_inferior_reset_breakpoints (); | |
781 | } | |
782 | else | |
783 | switch_to_thread (parent); | |
784 | } | |
785 | } | |
786 | break; | |
787 | case TARGET_WAITKIND_SPURIOUS: | |
788 | /* Nothing to follow. */ | |
789 | break; | |
790 | default: | |
791 | internal_error (__FILE__, __LINE__, | |
792 | "Unexpected pending_follow.kind %d\n", | |
793 | tp->pending_follow.kind); | |
794 | break; | |
795 | } | |
c906108c | 796 | |
e58b0e63 | 797 | return should_resume; |
c906108c SS |
798 | } |
799 | ||
d83ad864 | 800 | static void |
6604731b | 801 | follow_inferior_reset_breakpoints (void) |
c906108c | 802 | { |
4e1c45ea PA |
803 | struct thread_info *tp = inferior_thread (); |
804 | ||
6604731b DJ |
805 | /* Was there a step_resume breakpoint? (There was if the user |
806 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
807 | thread number. Cloned step_resume breakpoints are disabled on |
808 | creation, so enable it here now that it is associated with the | |
809 | correct thread. | |
6604731b DJ |
810 | |
811 | step_resumes are a form of bp that are made to be per-thread. | |
812 | Since we created the step_resume bp when the parent process | |
813 | was being debugged, and now are switching to the child process, | |
814 | from the breakpoint package's viewpoint, that's a switch of | |
815 | "threads". We must update the bp's notion of which thread | |
816 | it is for, or it'll be ignored when it triggers. */ | |
817 | ||
8358c15c | 818 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
819 | { |
820 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
821 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
822 | } | |
6604731b | 823 | |
a1aa2221 | 824 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 825 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
826 | { |
827 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
828 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
829 | } | |
186c406b | 830 | |
6604731b DJ |
831 | /* Reinsert all breakpoints in the child. The user may have set |
832 | breakpoints after catching the fork, in which case those | |
833 | were never set in the child, but only in the parent. This makes | |
834 | sure the inserted breakpoints match the breakpoint list. */ | |
835 | ||
836 | breakpoint_re_set (); | |
837 | insert_breakpoints (); | |
c906108c | 838 | } |
c906108c | 839 | |
6c95b8df PA |
840 | /* The child has exited or execed: resume threads of the parent the |
841 | user wanted to be executing. */ | |
842 | ||
843 | static int | |
844 | proceed_after_vfork_done (struct thread_info *thread, | |
845 | void *arg) | |
846 | { | |
847 | int pid = * (int *) arg; | |
848 | ||
849 | if (ptid_get_pid (thread->ptid) == pid | |
850 | && is_running (thread->ptid) | |
851 | && !is_executing (thread->ptid) | |
852 | && !thread->stop_requested | |
a493e3e2 | 853 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df PA |
854 | { |
855 | if (debug_infrun) | |
856 | fprintf_unfiltered (gdb_stdlog, | |
857 | "infrun: resuming vfork parent thread %s\n", | |
858 | target_pid_to_str (thread->ptid)); | |
859 | ||
860 | switch_to_thread (thread->ptid); | |
70509625 | 861 | clear_proceed_status (0); |
64ce06e4 | 862 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
863 | } |
864 | ||
865 | return 0; | |
866 | } | |
867 | ||
868 | /* Called whenever we notice an exec or exit event, to handle | |
869 | detaching or resuming a vfork parent. */ | |
870 | ||
871 | static void | |
872 | handle_vfork_child_exec_or_exit (int exec) | |
873 | { | |
874 | struct inferior *inf = current_inferior (); | |
875 | ||
876 | if (inf->vfork_parent) | |
877 | { | |
878 | int resume_parent = -1; | |
879 | ||
880 | /* This exec or exit marks the end of the shared memory region | |
881 | between the parent and the child. If the user wanted to | |
882 | detach from the parent, now is the time. */ | |
883 | ||
884 | if (inf->vfork_parent->pending_detach) | |
885 | { | |
886 | struct thread_info *tp; | |
887 | struct cleanup *old_chain; | |
888 | struct program_space *pspace; | |
889 | struct address_space *aspace; | |
890 | ||
1777feb0 | 891 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 892 | |
68c9da30 PA |
893 | inf->vfork_parent->pending_detach = 0; |
894 | ||
f50f4e56 PA |
895 | if (!exec) |
896 | { | |
897 | /* If we're handling a child exit, then inferior_ptid | |
898 | points at the inferior's pid, not to a thread. */ | |
899 | old_chain = save_inferior_ptid (); | |
900 | save_current_program_space (); | |
901 | save_current_inferior (); | |
902 | } | |
903 | else | |
904 | old_chain = save_current_space_and_thread (); | |
6c95b8df PA |
905 | |
906 | /* We're letting loose of the parent. */ | |
907 | tp = any_live_thread_of_process (inf->vfork_parent->pid); | |
908 | switch_to_thread (tp->ptid); | |
909 | ||
910 | /* We're about to detach from the parent, which implicitly | |
911 | removes breakpoints from its address space. There's a | |
912 | catch here: we want to reuse the spaces for the child, | |
913 | but, parent/child are still sharing the pspace at this | |
914 | point, although the exec in reality makes the kernel give | |
915 | the child a fresh set of new pages. The problem here is | |
916 | that the breakpoints module being unaware of this, would | |
917 | likely chose the child process to write to the parent | |
918 | address space. Swapping the child temporarily away from | |
919 | the spaces has the desired effect. Yes, this is "sort | |
920 | of" a hack. */ | |
921 | ||
922 | pspace = inf->pspace; | |
923 | aspace = inf->aspace; | |
924 | inf->aspace = NULL; | |
925 | inf->pspace = NULL; | |
926 | ||
927 | if (debug_infrun || info_verbose) | |
928 | { | |
6f259a23 | 929 | target_terminal_ours_for_output (); |
6c95b8df PA |
930 | |
931 | if (exec) | |
6f259a23 DB |
932 | { |
933 | fprintf_filtered (gdb_stdlog, | |
934 | _("Detaching vfork parent process " | |
935 | "%d after child exec.\n"), | |
936 | inf->vfork_parent->pid); | |
937 | } | |
6c95b8df | 938 | else |
6f259a23 DB |
939 | { |
940 | fprintf_filtered (gdb_stdlog, | |
941 | _("Detaching vfork parent process " | |
942 | "%d after child exit.\n"), | |
943 | inf->vfork_parent->pid); | |
944 | } | |
6c95b8df PA |
945 | } |
946 | ||
947 | target_detach (NULL, 0); | |
948 | ||
949 | /* Put it back. */ | |
950 | inf->pspace = pspace; | |
951 | inf->aspace = aspace; | |
952 | ||
953 | do_cleanups (old_chain); | |
954 | } | |
955 | else if (exec) | |
956 | { | |
957 | /* We're staying attached to the parent, so, really give the | |
958 | child a new address space. */ | |
959 | inf->pspace = add_program_space (maybe_new_address_space ()); | |
960 | inf->aspace = inf->pspace->aspace; | |
961 | inf->removable = 1; | |
962 | set_current_program_space (inf->pspace); | |
963 | ||
964 | resume_parent = inf->vfork_parent->pid; | |
965 | ||
966 | /* Break the bonds. */ | |
967 | inf->vfork_parent->vfork_child = NULL; | |
968 | } | |
969 | else | |
970 | { | |
971 | struct cleanup *old_chain; | |
972 | struct program_space *pspace; | |
973 | ||
974 | /* If this is a vfork child exiting, then the pspace and | |
975 | aspaces were shared with the parent. Since we're | |
976 | reporting the process exit, we'll be mourning all that is | |
977 | found in the address space, and switching to null_ptid, | |
978 | preparing to start a new inferior. But, since we don't | |
979 | want to clobber the parent's address/program spaces, we | |
980 | go ahead and create a new one for this exiting | |
981 | inferior. */ | |
982 | ||
983 | /* Switch to null_ptid, so that clone_program_space doesn't want | |
984 | to read the selected frame of a dead process. */ | |
985 | old_chain = save_inferior_ptid (); | |
986 | inferior_ptid = null_ptid; | |
987 | ||
988 | /* This inferior is dead, so avoid giving the breakpoints | |
989 | module the option to write through to it (cloning a | |
990 | program space resets breakpoints). */ | |
991 | inf->aspace = NULL; | |
992 | inf->pspace = NULL; | |
993 | pspace = add_program_space (maybe_new_address_space ()); | |
994 | set_current_program_space (pspace); | |
995 | inf->removable = 1; | |
7dcd53a0 | 996 | inf->symfile_flags = SYMFILE_NO_READ; |
6c95b8df PA |
997 | clone_program_space (pspace, inf->vfork_parent->pspace); |
998 | inf->pspace = pspace; | |
999 | inf->aspace = pspace->aspace; | |
1000 | ||
1001 | /* Put back inferior_ptid. We'll continue mourning this | |
1777feb0 | 1002 | inferior. */ |
6c95b8df PA |
1003 | do_cleanups (old_chain); |
1004 | ||
1005 | resume_parent = inf->vfork_parent->pid; | |
1006 | /* Break the bonds. */ | |
1007 | inf->vfork_parent->vfork_child = NULL; | |
1008 | } | |
1009 | ||
1010 | inf->vfork_parent = NULL; | |
1011 | ||
1012 | gdb_assert (current_program_space == inf->pspace); | |
1013 | ||
1014 | if (non_stop && resume_parent != -1) | |
1015 | { | |
1016 | /* If the user wanted the parent to be running, let it go | |
1017 | free now. */ | |
1018 | struct cleanup *old_chain = make_cleanup_restore_current_thread (); | |
1019 | ||
1020 | if (debug_infrun) | |
3e43a32a MS |
1021 | fprintf_unfiltered (gdb_stdlog, |
1022 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
1023 | resume_parent); |
1024 | ||
1025 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
1026 | ||
1027 | do_cleanups (old_chain); | |
1028 | } | |
1029 | } | |
1030 | } | |
1031 | ||
eb6c553b | 1032 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1033 | |
1034 | static const char follow_exec_mode_new[] = "new"; | |
1035 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1036 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1037 | { |
1038 | follow_exec_mode_new, | |
1039 | follow_exec_mode_same, | |
1040 | NULL, | |
1041 | }; | |
1042 | ||
1043 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1044 | static void | |
1045 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1046 | struct cmd_list_element *c, const char *value) | |
1047 | { | |
1048 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1049 | } | |
1050 | ||
1777feb0 | 1051 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
1adeb98a | 1052 | |
c906108c | 1053 | static void |
95e50b27 | 1054 | follow_exec (ptid_t ptid, char *execd_pathname) |
c906108c | 1055 | { |
95e50b27 | 1056 | struct thread_info *th, *tmp; |
6c95b8df | 1057 | struct inferior *inf = current_inferior (); |
95e50b27 | 1058 | int pid = ptid_get_pid (ptid); |
7a292a7a | 1059 | |
c906108c SS |
1060 | /* This is an exec event that we actually wish to pay attention to. |
1061 | Refresh our symbol table to the newly exec'd program, remove any | |
1062 | momentary bp's, etc. | |
1063 | ||
1064 | If there are breakpoints, they aren't really inserted now, | |
1065 | since the exec() transformed our inferior into a fresh set | |
1066 | of instructions. | |
1067 | ||
1068 | We want to preserve symbolic breakpoints on the list, since | |
1069 | we have hopes that they can be reset after the new a.out's | |
1070 | symbol table is read. | |
1071 | ||
1072 | However, any "raw" breakpoints must be removed from the list | |
1073 | (e.g., the solib bp's), since their address is probably invalid | |
1074 | now. | |
1075 | ||
1076 | And, we DON'T want to call delete_breakpoints() here, since | |
1077 | that may write the bp's "shadow contents" (the instruction | |
1078 | value that was overwritten witha TRAP instruction). Since | |
1777feb0 | 1079 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1080 | |
1081 | mark_breakpoints_out (); | |
1082 | ||
95e50b27 PA |
1083 | /* The target reports the exec event to the main thread, even if |
1084 | some other thread does the exec, and even if the main thread was | |
1085 | stopped or already gone. We may still have non-leader threads of | |
1086 | the process on our list. E.g., on targets that don't have thread | |
1087 | exit events (like remote); or on native Linux in non-stop mode if | |
1088 | there were only two threads in the inferior and the non-leader | |
1089 | one is the one that execs (and nothing forces an update of the | |
1090 | thread list up to here). When debugging remotely, it's best to | |
1091 | avoid extra traffic, when possible, so avoid syncing the thread | |
1092 | list with the target, and instead go ahead and delete all threads | |
1093 | of the process but one that reported the event. Note this must | |
1094 | be done before calling update_breakpoints_after_exec, as | |
1095 | otherwise clearing the threads' resources would reference stale | |
1096 | thread breakpoints -- it may have been one of these threads that | |
1097 | stepped across the exec. We could just clear their stepping | |
1098 | states, but as long as we're iterating, might as well delete | |
1099 | them. Deleting them now rather than at the next user-visible | |
1100 | stop provides a nicer sequence of events for user and MI | |
1101 | notifications. */ | |
1102 | ALL_NON_EXITED_THREADS_SAFE (th, tmp) | |
1103 | if (ptid_get_pid (th->ptid) == pid && !ptid_equal (th->ptid, ptid)) | |
1104 | delete_thread (th->ptid); | |
1105 | ||
1106 | /* We also need to clear any left over stale state for the | |
1107 | leader/event thread. E.g., if there was any step-resume | |
1108 | breakpoint or similar, it's gone now. We cannot truly | |
1109 | step-to-next statement through an exec(). */ | |
1110 | th = inferior_thread (); | |
8358c15c | 1111 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1112 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1113 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1114 | th->control.step_range_start = 0; |
1115 | th->control.step_range_end = 0; | |
c906108c | 1116 | |
95e50b27 PA |
1117 | /* The user may have had the main thread held stopped in the |
1118 | previous image (e.g., schedlock on, or non-stop). Release | |
1119 | it now. */ | |
a75724bc PA |
1120 | th->stop_requested = 0; |
1121 | ||
95e50b27 PA |
1122 | update_breakpoints_after_exec (); |
1123 | ||
1777feb0 | 1124 | /* What is this a.out's name? */ |
6c95b8df PA |
1125 | printf_unfiltered (_("%s is executing new program: %s\n"), |
1126 | target_pid_to_str (inferior_ptid), | |
1127 | execd_pathname); | |
c906108c SS |
1128 | |
1129 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1130 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1131 | |
c906108c | 1132 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
1133 | |
1134 | breakpoint_init_inferior (inf_execd); | |
e85a822c DJ |
1135 | |
1136 | if (gdb_sysroot && *gdb_sysroot) | |
1137 | { | |
1138 | char *name = alloca (strlen (gdb_sysroot) | |
1139 | + strlen (execd_pathname) | |
1140 | + 1); | |
abbb1732 | 1141 | |
e85a822c DJ |
1142 | strcpy (name, gdb_sysroot); |
1143 | strcat (name, execd_pathname); | |
1144 | execd_pathname = name; | |
1145 | } | |
c906108c | 1146 | |
cce9b6bf PA |
1147 | /* Reset the shared library package. This ensures that we get a |
1148 | shlib event when the child reaches "_start", at which point the | |
1149 | dld will have had a chance to initialize the child. */ | |
1150 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1151 | we don't want those to be satisfied by the libraries of the | |
1152 | previous incarnation of this process. */ | |
1153 | no_shared_libraries (NULL, 0); | |
1154 | ||
6c95b8df PA |
1155 | if (follow_exec_mode_string == follow_exec_mode_new) |
1156 | { | |
1157 | struct program_space *pspace; | |
6c95b8df PA |
1158 | |
1159 | /* The user wants to keep the old inferior and program spaces | |
1160 | around. Create a new fresh one, and switch to it. */ | |
1161 | ||
1162 | inf = add_inferior (current_inferior ()->pid); | |
1163 | pspace = add_program_space (maybe_new_address_space ()); | |
1164 | inf->pspace = pspace; | |
1165 | inf->aspace = pspace->aspace; | |
1166 | ||
1167 | exit_inferior_num_silent (current_inferior ()->num); | |
1168 | ||
1169 | set_current_inferior (inf); | |
1170 | set_current_program_space (pspace); | |
1171 | } | |
9107fc8d PA |
1172 | else |
1173 | { | |
1174 | /* The old description may no longer be fit for the new image. | |
1175 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1176 | old description; we'll read a new one below. No need to do | |
1177 | this on "follow-exec-mode new", as the old inferior stays | |
1178 | around (its description is later cleared/refetched on | |
1179 | restart). */ | |
1180 | target_clear_description (); | |
1181 | } | |
6c95b8df PA |
1182 | |
1183 | gdb_assert (current_program_space == inf->pspace); | |
1184 | ||
1777feb0 | 1185 | /* That a.out is now the one to use. */ |
6c95b8df PA |
1186 | exec_file_attach (execd_pathname, 0); |
1187 | ||
c1e56572 JK |
1188 | /* SYMFILE_DEFER_BP_RESET is used as the proper displacement for PIE |
1189 | (Position Independent Executable) main symbol file will get applied by | |
1190 | solib_create_inferior_hook below. breakpoint_re_set would fail to insert | |
1191 | the breakpoints with the zero displacement. */ | |
1192 | ||
7dcd53a0 TT |
1193 | symbol_file_add (execd_pathname, |
1194 | (inf->symfile_flags | |
1195 | | SYMFILE_MAINLINE | SYMFILE_DEFER_BP_RESET), | |
c1e56572 JK |
1196 | NULL, 0); |
1197 | ||
7dcd53a0 TT |
1198 | if ((inf->symfile_flags & SYMFILE_NO_READ) == 0) |
1199 | set_initial_language (); | |
c906108c | 1200 | |
9107fc8d PA |
1201 | /* If the target can specify a description, read it. Must do this |
1202 | after flipping to the new executable (because the target supplied | |
1203 | description must be compatible with the executable's | |
1204 | architecture, and the old executable may e.g., be 32-bit, while | |
1205 | the new one 64-bit), and before anything involving memory or | |
1206 | registers. */ | |
1207 | target_find_description (); | |
1208 | ||
268a4a75 | 1209 | solib_create_inferior_hook (0); |
c906108c | 1210 | |
4efc6507 DE |
1211 | jit_inferior_created_hook (); |
1212 | ||
c1e56572 JK |
1213 | breakpoint_re_set (); |
1214 | ||
c906108c SS |
1215 | /* Reinsert all breakpoints. (Those which were symbolic have |
1216 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1217 | to symbol_file_command...). */ |
c906108c SS |
1218 | insert_breakpoints (); |
1219 | ||
1220 | /* The next resume of this inferior should bring it to the shlib | |
1221 | startup breakpoints. (If the user had also set bp's on | |
1222 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1223 | matically get reset there in the new process.). */ |
c906108c SS |
1224 | } |
1225 | ||
963f9c80 | 1226 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1227 | |
1228 | struct step_over_info | |
1229 | { | |
963f9c80 PA |
1230 | /* If we're stepping past a breakpoint, this is the address space |
1231 | and address of the instruction the breakpoint is set at. We'll | |
1232 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1233 | non-NULL. */ | |
31e77af2 | 1234 | struct address_space *aspace; |
31e77af2 | 1235 | CORE_ADDR address; |
963f9c80 PA |
1236 | |
1237 | /* The instruction being stepped over triggers a nonsteppable | |
1238 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1239 | int nonsteppable_watchpoint_p; | |
31e77af2 PA |
1240 | }; |
1241 | ||
1242 | /* The step-over info of the location that is being stepped over. | |
1243 | ||
1244 | Note that with async/breakpoint always-inserted mode, a user might | |
1245 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1246 | being stepped over. As setting a new breakpoint inserts all | |
1247 | breakpoints, we need to make sure the breakpoint being stepped over | |
1248 | isn't inserted then. We do that by only clearing the step-over | |
1249 | info when the step-over is actually finished (or aborted). | |
1250 | ||
1251 | Presently GDB can only step over one breakpoint at any given time. | |
1252 | Given threads that can't run code in the same address space as the | |
1253 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1254 | to step-over at most one breakpoint per address space (so this info | |
1255 | could move to the address space object if/when GDB is extended). | |
1256 | The set of breakpoints being stepped over will normally be much | |
1257 | smaller than the set of all breakpoints, so a flag in the | |
1258 | breakpoint location structure would be wasteful. A separate list | |
1259 | also saves complexity and run-time, as otherwise we'd have to go | |
1260 | through all breakpoint locations clearing their flag whenever we | |
1261 | start a new sequence. Similar considerations weigh against storing | |
1262 | this info in the thread object. Plus, not all step overs actually | |
1263 | have breakpoint locations -- e.g., stepping past a single-step | |
1264 | breakpoint, or stepping to complete a non-continuable | |
1265 | watchpoint. */ | |
1266 | static struct step_over_info step_over_info; | |
1267 | ||
1268 | /* Record the address of the breakpoint/instruction we're currently | |
1269 | stepping over. */ | |
1270 | ||
1271 | static void | |
963f9c80 PA |
1272 | set_step_over_info (struct address_space *aspace, CORE_ADDR address, |
1273 | int nonsteppable_watchpoint_p) | |
31e77af2 PA |
1274 | { |
1275 | step_over_info.aspace = aspace; | |
1276 | step_over_info.address = address; | |
963f9c80 | 1277 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
31e77af2 PA |
1278 | } |
1279 | ||
1280 | /* Called when we're not longer stepping over a breakpoint / an | |
1281 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1282 | ||
1283 | static void | |
1284 | clear_step_over_info (void) | |
1285 | { | |
1286 | step_over_info.aspace = NULL; | |
1287 | step_over_info.address = 0; | |
963f9c80 | 1288 | step_over_info.nonsteppable_watchpoint_p = 0; |
31e77af2 PA |
1289 | } |
1290 | ||
7f89fd65 | 1291 | /* See infrun.h. */ |
31e77af2 PA |
1292 | |
1293 | int | |
1294 | stepping_past_instruction_at (struct address_space *aspace, | |
1295 | CORE_ADDR address) | |
1296 | { | |
1297 | return (step_over_info.aspace != NULL | |
1298 | && breakpoint_address_match (aspace, address, | |
1299 | step_over_info.aspace, | |
1300 | step_over_info.address)); | |
1301 | } | |
1302 | ||
963f9c80 PA |
1303 | /* See infrun.h. */ |
1304 | ||
1305 | int | |
1306 | stepping_past_nonsteppable_watchpoint (void) | |
1307 | { | |
1308 | return step_over_info.nonsteppable_watchpoint_p; | |
1309 | } | |
1310 | ||
6cc83d2a PA |
1311 | /* Returns true if step-over info is valid. */ |
1312 | ||
1313 | static int | |
1314 | step_over_info_valid_p (void) | |
1315 | { | |
963f9c80 PA |
1316 | return (step_over_info.aspace != NULL |
1317 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1318 | } |
1319 | ||
c906108c | 1320 | \f |
237fc4c9 PA |
1321 | /* Displaced stepping. */ |
1322 | ||
1323 | /* In non-stop debugging mode, we must take special care to manage | |
1324 | breakpoints properly; in particular, the traditional strategy for | |
1325 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1326 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1327 | breakpoint it has hit while ensuring that other threads running | |
1328 | concurrently will hit the breakpoint as they should. | |
1329 | ||
1330 | The traditional way to step a thread T off a breakpoint in a | |
1331 | multi-threaded program in all-stop mode is as follows: | |
1332 | ||
1333 | a0) Initially, all threads are stopped, and breakpoints are not | |
1334 | inserted. | |
1335 | a1) We single-step T, leaving breakpoints uninserted. | |
1336 | a2) We insert breakpoints, and resume all threads. | |
1337 | ||
1338 | In non-stop debugging, however, this strategy is unsuitable: we | |
1339 | don't want to have to stop all threads in the system in order to | |
1340 | continue or step T past a breakpoint. Instead, we use displaced | |
1341 | stepping: | |
1342 | ||
1343 | n0) Initially, T is stopped, other threads are running, and | |
1344 | breakpoints are inserted. | |
1345 | n1) We copy the instruction "under" the breakpoint to a separate | |
1346 | location, outside the main code stream, making any adjustments | |
1347 | to the instruction, register, and memory state as directed by | |
1348 | T's architecture. | |
1349 | n2) We single-step T over the instruction at its new location. | |
1350 | n3) We adjust the resulting register and memory state as directed | |
1351 | by T's architecture. This includes resetting T's PC to point | |
1352 | back into the main instruction stream. | |
1353 | n4) We resume T. | |
1354 | ||
1355 | This approach depends on the following gdbarch methods: | |
1356 | ||
1357 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1358 | indicate where to copy the instruction, and how much space must | |
1359 | be reserved there. We use these in step n1. | |
1360 | ||
1361 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1362 | address, and makes any necessary adjustments to the instruction, | |
1363 | register contents, and memory. We use this in step n1. | |
1364 | ||
1365 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
1366 | we have successfuly single-stepped the instruction, to yield the | |
1367 | same effect the instruction would have had if we had executed it | |
1368 | at its original address. We use this in step n3. | |
1369 | ||
1370 | - gdbarch_displaced_step_free_closure provides cleanup. | |
1371 | ||
1372 | The gdbarch_displaced_step_copy_insn and | |
1373 | gdbarch_displaced_step_fixup functions must be written so that | |
1374 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1375 | single-stepping across the copied instruction, and then applying | |
1376 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1377 | thread's memory and registers as stepping the instruction in place | |
1378 | would have. Exactly which responsibilities fall to the copy and | |
1379 | which fall to the fixup is up to the author of those functions. | |
1380 | ||
1381 | See the comments in gdbarch.sh for details. | |
1382 | ||
1383 | Note that displaced stepping and software single-step cannot | |
1384 | currently be used in combination, although with some care I think | |
1385 | they could be made to. Software single-step works by placing | |
1386 | breakpoints on all possible subsequent instructions; if the | |
1387 | displaced instruction is a PC-relative jump, those breakpoints | |
1388 | could fall in very strange places --- on pages that aren't | |
1389 | executable, or at addresses that are not proper instruction | |
1390 | boundaries. (We do generally let other threads run while we wait | |
1391 | to hit the software single-step breakpoint, and they might | |
1392 | encounter such a corrupted instruction.) One way to work around | |
1393 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1394 | simulate the effect of PC-relative instructions (and return NULL) | |
1395 | on architectures that use software single-stepping. | |
1396 | ||
1397 | In non-stop mode, we can have independent and simultaneous step | |
1398 | requests, so more than one thread may need to simultaneously step | |
1399 | over a breakpoint. The current implementation assumes there is | |
1400 | only one scratch space per process. In this case, we have to | |
1401 | serialize access to the scratch space. If thread A wants to step | |
1402 | over a breakpoint, but we are currently waiting for some other | |
1403 | thread to complete a displaced step, we leave thread A stopped and | |
1404 | place it in the displaced_step_request_queue. Whenever a displaced | |
1405 | step finishes, we pick the next thread in the queue and start a new | |
1406 | displaced step operation on it. See displaced_step_prepare and | |
1407 | displaced_step_fixup for details. */ | |
1408 | ||
237fc4c9 PA |
1409 | struct displaced_step_request |
1410 | { | |
1411 | ptid_t ptid; | |
1412 | struct displaced_step_request *next; | |
1413 | }; | |
1414 | ||
fc1cf338 PA |
1415 | /* Per-inferior displaced stepping state. */ |
1416 | struct displaced_step_inferior_state | |
1417 | { | |
1418 | /* Pointer to next in linked list. */ | |
1419 | struct displaced_step_inferior_state *next; | |
1420 | ||
1421 | /* The process this displaced step state refers to. */ | |
1422 | int pid; | |
1423 | ||
1424 | /* A queue of pending displaced stepping requests. One entry per | |
1425 | thread that needs to do a displaced step. */ | |
1426 | struct displaced_step_request *step_request_queue; | |
1427 | ||
1428 | /* If this is not null_ptid, this is the thread carrying out a | |
1429 | displaced single-step in process PID. This thread's state will | |
1430 | require fixing up once it has completed its step. */ | |
1431 | ptid_t step_ptid; | |
1432 | ||
1433 | /* The architecture the thread had when we stepped it. */ | |
1434 | struct gdbarch *step_gdbarch; | |
1435 | ||
1436 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
1437 | for post-step cleanup. */ | |
1438 | struct displaced_step_closure *step_closure; | |
1439 | ||
1440 | /* The address of the original instruction, and the copy we | |
1441 | made. */ | |
1442 | CORE_ADDR step_original, step_copy; | |
1443 | ||
1444 | /* Saved contents of copy area. */ | |
1445 | gdb_byte *step_saved_copy; | |
1446 | }; | |
1447 | ||
1448 | /* The list of states of processes involved in displaced stepping | |
1449 | presently. */ | |
1450 | static struct displaced_step_inferior_state *displaced_step_inferior_states; | |
1451 | ||
1452 | /* Get the displaced stepping state of process PID. */ | |
1453 | ||
1454 | static struct displaced_step_inferior_state * | |
1455 | get_displaced_stepping_state (int pid) | |
1456 | { | |
1457 | struct displaced_step_inferior_state *state; | |
1458 | ||
1459 | for (state = displaced_step_inferior_states; | |
1460 | state != NULL; | |
1461 | state = state->next) | |
1462 | if (state->pid == pid) | |
1463 | return state; | |
1464 | ||
1465 | return NULL; | |
1466 | } | |
1467 | ||
1468 | /* Add a new displaced stepping state for process PID to the displaced | |
1469 | stepping state list, or return a pointer to an already existing | |
1470 | entry, if it already exists. Never returns NULL. */ | |
1471 | ||
1472 | static struct displaced_step_inferior_state * | |
1473 | add_displaced_stepping_state (int pid) | |
1474 | { | |
1475 | struct displaced_step_inferior_state *state; | |
1476 | ||
1477 | for (state = displaced_step_inferior_states; | |
1478 | state != NULL; | |
1479 | state = state->next) | |
1480 | if (state->pid == pid) | |
1481 | return state; | |
237fc4c9 | 1482 | |
fc1cf338 PA |
1483 | state = xcalloc (1, sizeof (*state)); |
1484 | state->pid = pid; | |
1485 | state->next = displaced_step_inferior_states; | |
1486 | displaced_step_inferior_states = state; | |
237fc4c9 | 1487 | |
fc1cf338 PA |
1488 | return state; |
1489 | } | |
1490 | ||
a42244db YQ |
1491 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1492 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1493 | return NULL. */ | |
1494 | ||
1495 | struct displaced_step_closure* | |
1496 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1497 | { | |
1498 | struct displaced_step_inferior_state *displaced | |
1499 | = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); | |
1500 | ||
1501 | /* If checking the mode of displaced instruction in copy area. */ | |
1502 | if (displaced && !ptid_equal (displaced->step_ptid, null_ptid) | |
1503 | && (displaced->step_copy == addr)) | |
1504 | return displaced->step_closure; | |
1505 | ||
1506 | return NULL; | |
1507 | } | |
1508 | ||
fc1cf338 | 1509 | /* Remove the displaced stepping state of process PID. */ |
237fc4c9 | 1510 | |
fc1cf338 PA |
1511 | static void |
1512 | remove_displaced_stepping_state (int pid) | |
1513 | { | |
1514 | struct displaced_step_inferior_state *it, **prev_next_p; | |
237fc4c9 | 1515 | |
fc1cf338 PA |
1516 | gdb_assert (pid != 0); |
1517 | ||
1518 | it = displaced_step_inferior_states; | |
1519 | prev_next_p = &displaced_step_inferior_states; | |
1520 | while (it) | |
1521 | { | |
1522 | if (it->pid == pid) | |
1523 | { | |
1524 | *prev_next_p = it->next; | |
1525 | xfree (it); | |
1526 | return; | |
1527 | } | |
1528 | ||
1529 | prev_next_p = &it->next; | |
1530 | it = *prev_next_p; | |
1531 | } | |
1532 | } | |
1533 | ||
1534 | static void | |
1535 | infrun_inferior_exit (struct inferior *inf) | |
1536 | { | |
1537 | remove_displaced_stepping_state (inf->pid); | |
1538 | } | |
237fc4c9 | 1539 | |
fff08868 HZ |
1540 | /* If ON, and the architecture supports it, GDB will use displaced |
1541 | stepping to step over breakpoints. If OFF, or if the architecture | |
1542 | doesn't support it, GDB will instead use the traditional | |
1543 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1544 | decide which technique to use to step over breakpoints depending on | |
1545 | which of all-stop or non-stop mode is active --- displaced stepping | |
1546 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1547 | ||
72d0e2c5 | 1548 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1549 | |
237fc4c9 PA |
1550 | static void |
1551 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1552 | struct cmd_list_element *c, | |
1553 | const char *value) | |
1554 | { | |
72d0e2c5 | 1555 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1556 | fprintf_filtered (file, |
1557 | _("Debugger's willingness to use displaced stepping " | |
1558 | "to step over breakpoints is %s (currently %s).\n"), | |
fff08868 HZ |
1559 | value, non_stop ? "on" : "off"); |
1560 | else | |
3e43a32a MS |
1561 | fprintf_filtered (file, |
1562 | _("Debugger's willingness to use displaced stepping " | |
1563 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1564 | } |
1565 | ||
fff08868 HZ |
1566 | /* Return non-zero if displaced stepping can/should be used to step |
1567 | over breakpoints. */ | |
1568 | ||
237fc4c9 PA |
1569 | static int |
1570 | use_displaced_stepping (struct gdbarch *gdbarch) | |
1571 | { | |
72d0e2c5 YQ |
1572 | return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO && non_stop) |
1573 | || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
96429cc8 | 1574 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
8213266a | 1575 | && find_record_target () == NULL); |
237fc4c9 PA |
1576 | } |
1577 | ||
1578 | /* Clean out any stray displaced stepping state. */ | |
1579 | static void | |
fc1cf338 | 1580 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1581 | { |
1582 | /* Indicate that there is no cleanup pending. */ | |
fc1cf338 | 1583 | displaced->step_ptid = null_ptid; |
237fc4c9 | 1584 | |
fc1cf338 | 1585 | if (displaced->step_closure) |
237fc4c9 | 1586 | { |
fc1cf338 PA |
1587 | gdbarch_displaced_step_free_closure (displaced->step_gdbarch, |
1588 | displaced->step_closure); | |
1589 | displaced->step_closure = NULL; | |
237fc4c9 PA |
1590 | } |
1591 | } | |
1592 | ||
1593 | static void | |
fc1cf338 | 1594 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1595 | { |
fc1cf338 PA |
1596 | struct displaced_step_inferior_state *state = arg; |
1597 | ||
1598 | displaced_step_clear (state); | |
237fc4c9 PA |
1599 | } |
1600 | ||
1601 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1602 | void | |
1603 | displaced_step_dump_bytes (struct ui_file *file, | |
1604 | const gdb_byte *buf, | |
1605 | size_t len) | |
1606 | { | |
1607 | int i; | |
1608 | ||
1609 | for (i = 0; i < len; i++) | |
1610 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1611 | fputs_unfiltered ("\n", file); | |
1612 | } | |
1613 | ||
1614 | /* Prepare to single-step, using displaced stepping. | |
1615 | ||
1616 | Note that we cannot use displaced stepping when we have a signal to | |
1617 | deliver. If we have a signal to deliver and an instruction to step | |
1618 | over, then after the step, there will be no indication from the | |
1619 | target whether the thread entered a signal handler or ignored the | |
1620 | signal and stepped over the instruction successfully --- both cases | |
1621 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1622 | fixup, and in the second case we must --- but we can't tell which. | |
1623 | Comments in the code for 'random signals' in handle_inferior_event | |
1624 | explain how we handle this case instead. | |
1625 | ||
1626 | Returns 1 if preparing was successful -- this thread is going to be | |
1627 | stepped now; or 0 if displaced stepping this thread got queued. */ | |
1628 | static int | |
1629 | displaced_step_prepare (ptid_t ptid) | |
1630 | { | |
ad53cd71 | 1631 | struct cleanup *old_cleanups, *ignore_cleanups; |
c1e36e3e | 1632 | struct thread_info *tp = find_thread_ptid (ptid); |
237fc4c9 PA |
1633 | struct regcache *regcache = get_thread_regcache (ptid); |
1634 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1635 | CORE_ADDR original, copy; | |
1636 | ULONGEST len; | |
1637 | struct displaced_step_closure *closure; | |
fc1cf338 | 1638 | struct displaced_step_inferior_state *displaced; |
9e529e1d | 1639 | int status; |
237fc4c9 PA |
1640 | |
1641 | /* We should never reach this function if the architecture does not | |
1642 | support displaced stepping. */ | |
1643 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1644 | ||
c1e36e3e PA |
1645 | /* Disable range stepping while executing in the scratch pad. We |
1646 | want a single-step even if executing the displaced instruction in | |
1647 | the scratch buffer lands within the stepping range (e.g., a | |
1648 | jump/branch). */ | |
1649 | tp->control.may_range_step = 0; | |
1650 | ||
fc1cf338 PA |
1651 | /* We have to displaced step one thread at a time, as we only have |
1652 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1653 | |
fc1cf338 PA |
1654 | displaced = add_displaced_stepping_state (ptid_get_pid (ptid)); |
1655 | ||
1656 | if (!ptid_equal (displaced->step_ptid, null_ptid)) | |
237fc4c9 PA |
1657 | { |
1658 | /* Already waiting for a displaced step to finish. Defer this | |
1659 | request and place in queue. */ | |
1660 | struct displaced_step_request *req, *new_req; | |
1661 | ||
1662 | if (debug_displaced) | |
1663 | fprintf_unfiltered (gdb_stdlog, | |
1664 | "displaced: defering step of %s\n", | |
1665 | target_pid_to_str (ptid)); | |
1666 | ||
1667 | new_req = xmalloc (sizeof (*new_req)); | |
1668 | new_req->ptid = ptid; | |
1669 | new_req->next = NULL; | |
1670 | ||
fc1cf338 | 1671 | if (displaced->step_request_queue) |
237fc4c9 | 1672 | { |
fc1cf338 | 1673 | for (req = displaced->step_request_queue; |
237fc4c9 PA |
1674 | req && req->next; |
1675 | req = req->next) | |
1676 | ; | |
1677 | req->next = new_req; | |
1678 | } | |
1679 | else | |
fc1cf338 | 1680 | displaced->step_request_queue = new_req; |
237fc4c9 PA |
1681 | |
1682 | return 0; | |
1683 | } | |
1684 | else | |
1685 | { | |
1686 | if (debug_displaced) | |
1687 | fprintf_unfiltered (gdb_stdlog, | |
1688 | "displaced: stepping %s now\n", | |
1689 | target_pid_to_str (ptid)); | |
1690 | } | |
1691 | ||
fc1cf338 | 1692 | displaced_step_clear (displaced); |
237fc4c9 | 1693 | |
ad53cd71 PA |
1694 | old_cleanups = save_inferior_ptid (); |
1695 | inferior_ptid = ptid; | |
1696 | ||
515630c5 | 1697 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1698 | |
1699 | copy = gdbarch_displaced_step_location (gdbarch); | |
1700 | len = gdbarch_max_insn_length (gdbarch); | |
1701 | ||
1702 | /* Save the original contents of the copy area. */ | |
fc1cf338 | 1703 | displaced->step_saved_copy = xmalloc (len); |
ad53cd71 | 1704 | ignore_cleanups = make_cleanup (free_current_contents, |
fc1cf338 | 1705 | &displaced->step_saved_copy); |
9e529e1d JK |
1706 | status = target_read_memory (copy, displaced->step_saved_copy, len); |
1707 | if (status != 0) | |
1708 | throw_error (MEMORY_ERROR, | |
1709 | _("Error accessing memory address %s (%s) for " | |
1710 | "displaced-stepping scratch space."), | |
1711 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1712 | if (debug_displaced) |
1713 | { | |
5af949e3 UW |
1714 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1715 | paddress (gdbarch, copy)); | |
fc1cf338 PA |
1716 | displaced_step_dump_bytes (gdb_stdlog, |
1717 | displaced->step_saved_copy, | |
1718 | len); | |
237fc4c9 PA |
1719 | }; |
1720 | ||
1721 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1722 | original, copy, regcache); |
237fc4c9 PA |
1723 | |
1724 | /* We don't support the fully-simulated case at present. */ | |
1725 | gdb_assert (closure); | |
1726 | ||
9f5a595d UW |
1727 | /* Save the information we need to fix things up if the step |
1728 | succeeds. */ | |
fc1cf338 PA |
1729 | displaced->step_ptid = ptid; |
1730 | displaced->step_gdbarch = gdbarch; | |
1731 | displaced->step_closure = closure; | |
1732 | displaced->step_original = original; | |
1733 | displaced->step_copy = copy; | |
9f5a595d | 1734 | |
fc1cf338 | 1735 | make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1736 | |
1737 | /* Resume execution at the copy. */ | |
515630c5 | 1738 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1739 | |
ad53cd71 PA |
1740 | discard_cleanups (ignore_cleanups); |
1741 | ||
1742 | do_cleanups (old_cleanups); | |
237fc4c9 PA |
1743 | |
1744 | if (debug_displaced) | |
5af949e3 UW |
1745 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1746 | paddress (gdbarch, copy)); | |
237fc4c9 | 1747 | |
237fc4c9 PA |
1748 | return 1; |
1749 | } | |
1750 | ||
237fc4c9 | 1751 | static void |
3e43a32a MS |
1752 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1753 | const gdb_byte *myaddr, int len) | |
237fc4c9 PA |
1754 | { |
1755 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
abbb1732 | 1756 | |
237fc4c9 PA |
1757 | inferior_ptid = ptid; |
1758 | write_memory (memaddr, myaddr, len); | |
1759 | do_cleanups (ptid_cleanup); | |
1760 | } | |
1761 | ||
e2d96639 YQ |
1762 | /* Restore the contents of the copy area for thread PTID. */ |
1763 | ||
1764 | static void | |
1765 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1766 | ptid_t ptid) | |
1767 | { | |
1768 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1769 | ||
1770 | write_memory_ptid (ptid, displaced->step_copy, | |
1771 | displaced->step_saved_copy, len); | |
1772 | if (debug_displaced) | |
1773 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
1774 | target_pid_to_str (ptid), | |
1775 | paddress (displaced->step_gdbarch, | |
1776 | displaced->step_copy)); | |
1777 | } | |
1778 | ||
237fc4c9 | 1779 | static void |
2ea28649 | 1780 | displaced_step_fixup (ptid_t event_ptid, enum gdb_signal signal) |
237fc4c9 PA |
1781 | { |
1782 | struct cleanup *old_cleanups; | |
fc1cf338 PA |
1783 | struct displaced_step_inferior_state *displaced |
1784 | = get_displaced_stepping_state (ptid_get_pid (event_ptid)); | |
1785 | ||
1786 | /* Was any thread of this process doing a displaced step? */ | |
1787 | if (displaced == NULL) | |
1788 | return; | |
237fc4c9 PA |
1789 | |
1790 | /* Was this event for the pid we displaced? */ | |
fc1cf338 PA |
1791 | if (ptid_equal (displaced->step_ptid, null_ptid) |
1792 | || ! ptid_equal (displaced->step_ptid, event_ptid)) | |
237fc4c9 PA |
1793 | return; |
1794 | ||
fc1cf338 | 1795 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 | 1796 | |
e2d96639 | 1797 | displaced_step_restore (displaced, displaced->step_ptid); |
237fc4c9 PA |
1798 | |
1799 | /* Did the instruction complete successfully? */ | |
a493e3e2 | 1800 | if (signal == GDB_SIGNAL_TRAP) |
237fc4c9 | 1801 | { |
b052c4fb PA |
1802 | /* Fixup may need to read memory/registers. Switch to the |
1803 | thread that we're fixing up. */ | |
1804 | switch_to_thread (event_ptid); | |
1805 | ||
237fc4c9 | 1806 | /* Fix up the resulting state. */ |
fc1cf338 PA |
1807 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
1808 | displaced->step_closure, | |
1809 | displaced->step_original, | |
1810 | displaced->step_copy, | |
1811 | get_thread_regcache (displaced->step_ptid)); | |
237fc4c9 PA |
1812 | } |
1813 | else | |
1814 | { | |
1815 | /* Since the instruction didn't complete, all we can do is | |
1816 | relocate the PC. */ | |
515630c5 UW |
1817 | struct regcache *regcache = get_thread_regcache (event_ptid); |
1818 | CORE_ADDR pc = regcache_read_pc (regcache); | |
abbb1732 | 1819 | |
fc1cf338 | 1820 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1821 | regcache_write_pc (regcache, pc); |
237fc4c9 PA |
1822 | } |
1823 | ||
1824 | do_cleanups (old_cleanups); | |
1825 | ||
fc1cf338 | 1826 | displaced->step_ptid = null_ptid; |
1c5cfe86 | 1827 | |
237fc4c9 | 1828 | /* Are there any pending displaced stepping requests? If so, run |
fc1cf338 PA |
1829 | one now. Leave the state object around, since we're likely to |
1830 | need it again soon. */ | |
1831 | while (displaced->step_request_queue) | |
237fc4c9 PA |
1832 | { |
1833 | struct displaced_step_request *head; | |
1834 | ptid_t ptid; | |
5af949e3 | 1835 | struct regcache *regcache; |
929dfd4f | 1836 | struct gdbarch *gdbarch; |
1c5cfe86 | 1837 | CORE_ADDR actual_pc; |
6c95b8df | 1838 | struct address_space *aspace; |
237fc4c9 | 1839 | |
fc1cf338 | 1840 | head = displaced->step_request_queue; |
237fc4c9 | 1841 | ptid = head->ptid; |
fc1cf338 | 1842 | displaced->step_request_queue = head->next; |
237fc4c9 PA |
1843 | xfree (head); |
1844 | ||
ad53cd71 PA |
1845 | context_switch (ptid); |
1846 | ||
5af949e3 UW |
1847 | regcache = get_thread_regcache (ptid); |
1848 | actual_pc = regcache_read_pc (regcache); | |
6c95b8df | 1849 | aspace = get_regcache_aspace (regcache); |
1c5cfe86 | 1850 | |
6c95b8df | 1851 | if (breakpoint_here_p (aspace, actual_pc)) |
ad53cd71 | 1852 | { |
1c5cfe86 PA |
1853 | if (debug_displaced) |
1854 | fprintf_unfiltered (gdb_stdlog, | |
1855 | "displaced: stepping queued %s now\n", | |
1856 | target_pid_to_str (ptid)); | |
1857 | ||
1858 | displaced_step_prepare (ptid); | |
1859 | ||
929dfd4f JB |
1860 | gdbarch = get_regcache_arch (regcache); |
1861 | ||
1c5cfe86 PA |
1862 | if (debug_displaced) |
1863 | { | |
929dfd4f | 1864 | CORE_ADDR actual_pc = regcache_read_pc (regcache); |
1c5cfe86 PA |
1865 | gdb_byte buf[4]; |
1866 | ||
5af949e3 UW |
1867 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", |
1868 | paddress (gdbarch, actual_pc)); | |
1c5cfe86 PA |
1869 | read_memory (actual_pc, buf, sizeof (buf)); |
1870 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1871 | } | |
1872 | ||
fc1cf338 PA |
1873 | if (gdbarch_displaced_step_hw_singlestep (gdbarch, |
1874 | displaced->step_closure)) | |
a493e3e2 | 1875 | target_resume (ptid, 1, GDB_SIGNAL_0); |
99e40580 | 1876 | else |
a493e3e2 | 1877 | target_resume (ptid, 0, GDB_SIGNAL_0); |
1c5cfe86 PA |
1878 | |
1879 | /* Done, we're stepping a thread. */ | |
1880 | break; | |
ad53cd71 | 1881 | } |
1c5cfe86 PA |
1882 | else |
1883 | { | |
1884 | int step; | |
1885 | struct thread_info *tp = inferior_thread (); | |
1886 | ||
1887 | /* The breakpoint we were sitting under has since been | |
1888 | removed. */ | |
16c381f0 | 1889 | tp->control.trap_expected = 0; |
1c5cfe86 PA |
1890 | |
1891 | /* Go back to what we were trying to do. */ | |
1892 | step = currently_stepping (tp); | |
ad53cd71 | 1893 | |
1c5cfe86 | 1894 | if (debug_displaced) |
3e43a32a | 1895 | fprintf_unfiltered (gdb_stdlog, |
27d2932e | 1896 | "displaced: breakpoint is gone: %s, step(%d)\n", |
1c5cfe86 PA |
1897 | target_pid_to_str (tp->ptid), step); |
1898 | ||
a493e3e2 PA |
1899 | target_resume (ptid, step, GDB_SIGNAL_0); |
1900 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
1c5cfe86 PA |
1901 | |
1902 | /* This request was discarded. See if there's any other | |
1903 | thread waiting for its turn. */ | |
1904 | } | |
237fc4c9 PA |
1905 | } |
1906 | } | |
1907 | ||
5231c1fd PA |
1908 | /* Update global variables holding ptids to hold NEW_PTID if they were |
1909 | holding OLD_PTID. */ | |
1910 | static void | |
1911 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
1912 | { | |
1913 | struct displaced_step_request *it; | |
fc1cf338 | 1914 | struct displaced_step_inferior_state *displaced; |
5231c1fd PA |
1915 | |
1916 | if (ptid_equal (inferior_ptid, old_ptid)) | |
1917 | inferior_ptid = new_ptid; | |
1918 | ||
fc1cf338 PA |
1919 | for (displaced = displaced_step_inferior_states; |
1920 | displaced; | |
1921 | displaced = displaced->next) | |
1922 | { | |
1923 | if (ptid_equal (displaced->step_ptid, old_ptid)) | |
1924 | displaced->step_ptid = new_ptid; | |
1925 | ||
1926 | for (it = displaced->step_request_queue; it; it = it->next) | |
1927 | if (ptid_equal (it->ptid, old_ptid)) | |
1928 | it->ptid = new_ptid; | |
1929 | } | |
5231c1fd PA |
1930 | } |
1931 | ||
237fc4c9 PA |
1932 | \f |
1933 | /* Resuming. */ | |
c906108c SS |
1934 | |
1935 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 1936 | static void |
74b7792f | 1937 | resume_cleanups (void *ignore) |
c906108c | 1938 | { |
34b7e8a6 PA |
1939 | if (!ptid_equal (inferior_ptid, null_ptid)) |
1940 | delete_single_step_breakpoints (inferior_thread ()); | |
7c16b83e | 1941 | |
c906108c SS |
1942 | normal_stop (); |
1943 | } | |
1944 | ||
53904c9e AC |
1945 | static const char schedlock_off[] = "off"; |
1946 | static const char schedlock_on[] = "on"; | |
1947 | static const char schedlock_step[] = "step"; | |
40478521 | 1948 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
1949 | schedlock_off, |
1950 | schedlock_on, | |
1951 | schedlock_step, | |
1952 | NULL | |
1953 | }; | |
920d2a44 AC |
1954 | static const char *scheduler_mode = schedlock_off; |
1955 | static void | |
1956 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
1957 | struct cmd_list_element *c, const char *value) | |
1958 | { | |
3e43a32a MS |
1959 | fprintf_filtered (file, |
1960 | _("Mode for locking scheduler " | |
1961 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
1962 | value); |
1963 | } | |
c906108c SS |
1964 | |
1965 | static void | |
96baa820 | 1966 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 1967 | { |
eefe576e AC |
1968 | if (!target_can_lock_scheduler) |
1969 | { | |
1970 | scheduler_mode = schedlock_off; | |
1971 | error (_("Target '%s' cannot support this command."), target_shortname); | |
1972 | } | |
c906108c SS |
1973 | } |
1974 | ||
d4db2f36 PA |
1975 | /* True if execution commands resume all threads of all processes by |
1976 | default; otherwise, resume only threads of the current inferior | |
1977 | process. */ | |
1978 | int sched_multi = 0; | |
1979 | ||
2facfe5c DD |
1980 | /* Try to setup for software single stepping over the specified location. |
1981 | Return 1 if target_resume() should use hardware single step. | |
1982 | ||
1983 | GDBARCH the current gdbarch. | |
1984 | PC the location to step over. */ | |
1985 | ||
1986 | static int | |
1987 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1988 | { | |
1989 | int hw_step = 1; | |
1990 | ||
f02253f1 HZ |
1991 | if (execution_direction == EXEC_FORWARD |
1992 | && gdbarch_software_single_step_p (gdbarch) | |
99e40580 | 1993 | && gdbarch_software_single_step (gdbarch, get_current_frame ())) |
2facfe5c | 1994 | { |
99e40580 | 1995 | hw_step = 0; |
2facfe5c DD |
1996 | } |
1997 | return hw_step; | |
1998 | } | |
c906108c | 1999 | |
09cee04b PA |
2000 | ptid_t |
2001 | user_visible_resume_ptid (int step) | |
2002 | { | |
2003 | /* By default, resume all threads of all processes. */ | |
2004 | ptid_t resume_ptid = RESUME_ALL; | |
2005 | ||
2006 | /* Maybe resume only all threads of the current process. */ | |
2007 | if (!sched_multi && target_supports_multi_process ()) | |
2008 | { | |
2009 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
2010 | } | |
2011 | ||
2012 | /* Maybe resume a single thread after all. */ | |
2013 | if (non_stop) | |
2014 | { | |
2015 | /* With non-stop mode on, threads are always handled | |
2016 | individually. */ | |
2017 | resume_ptid = inferior_ptid; | |
2018 | } | |
2019 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2020 | || (scheduler_mode == schedlock_step && step)) |
09cee04b PA |
2021 | { |
2022 | /* User-settable 'scheduler' mode requires solo thread resume. */ | |
2023 | resume_ptid = inferior_ptid; | |
2024 | } | |
2025 | ||
70509625 PA |
2026 | /* We may actually resume fewer threads at first, e.g., if a thread |
2027 | is stopped at a breakpoint that needs stepping-off, but that | |
2028 | should not be visible to the user/frontend, and neither should | |
2029 | the frontend/user be allowed to proceed any of the threads that | |
2030 | happen to be stopped for internal run control handling, if a | |
2031 | previous command wanted them resumed. */ | |
09cee04b PA |
2032 | return resume_ptid; |
2033 | } | |
2034 | ||
64ce06e4 PA |
2035 | /* Wrapper for target_resume, that handles infrun-specific |
2036 | bookkeeping. */ | |
2037 | ||
2038 | static void | |
2039 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2040 | { | |
2041 | struct thread_info *tp = inferior_thread (); | |
2042 | ||
2043 | /* Install inferior's terminal modes. */ | |
2044 | target_terminal_inferior (); | |
2045 | ||
2046 | /* Avoid confusing the next resume, if the next stop/resume | |
2047 | happens to apply to another thread. */ | |
2048 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2049 | ||
2050 | /* Advise target which signals may be handled silently. If we have | |
2051 | removed breakpoints because we are stepping over one (in any | |
2052 | thread), we need to receive all signals to avoid accidentally | |
2053 | skipping a breakpoint during execution of a signal handler. */ | |
2054 | if (step_over_info_valid_p ()) | |
2055 | target_pass_signals (0, NULL); | |
2056 | else | |
2057 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
2058 | ||
2059 | target_resume (resume_ptid, step, sig); | |
2060 | } | |
2061 | ||
c906108c SS |
2062 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
2063 | wants to interrupt some lengthy single-stepping operation | |
2064 | (for child processes, the SIGINT goes to the inferior, and so | |
2065 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
2066 | other targets, that's not true). | |
2067 | ||
c906108c SS |
2068 | SIG is the signal to give the inferior (zero for none). */ |
2069 | void | |
64ce06e4 | 2070 | resume (enum gdb_signal sig) |
c906108c | 2071 | { |
74b7792f | 2072 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
2073 | struct regcache *regcache = get_current_regcache (); |
2074 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4e1c45ea | 2075 | struct thread_info *tp = inferior_thread (); |
515630c5 | 2076 | CORE_ADDR pc = regcache_read_pc (regcache); |
6c95b8df | 2077 | struct address_space *aspace = get_regcache_aspace (regcache); |
b0f16a3e | 2078 | ptid_t resume_ptid; |
856e7dd6 PA |
2079 | /* This represents the user's step vs continue request. When |
2080 | deciding whether "set scheduler-locking step" applies, it's the | |
2081 | user's intention that counts. */ | |
2082 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2083 | /* This represents what we'll actually request the target to do. |
2084 | This can decay from a step to a continue, if e.g., we need to | |
2085 | implement single-stepping with breakpoints (software | |
2086 | single-step). */ | |
2087 | int step = currently_stepping (tp); | |
c7e8a53c | 2088 | |
af48d08f PA |
2089 | tp->stepped_breakpoint = 0; |
2090 | ||
c906108c SS |
2091 | QUIT; |
2092 | ||
74609e71 YQ |
2093 | if (current_inferior ()->waiting_for_vfork_done) |
2094 | { | |
48f9886d PA |
2095 | /* Don't try to single-step a vfork parent that is waiting for |
2096 | the child to get out of the shared memory region (by exec'ing | |
2097 | or exiting). This is particularly important on software | |
2098 | single-step archs, as the child process would trip on the | |
2099 | software single step breakpoint inserted for the parent | |
2100 | process. Since the parent will not actually execute any | |
2101 | instruction until the child is out of the shared region (such | |
2102 | are vfork's semantics), it is safe to simply continue it. | |
2103 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2104 | the parent, and tell it to `keep_going', which automatically | |
2105 | re-sets it stepping. */ | |
74609e71 YQ |
2106 | if (debug_infrun) |
2107 | fprintf_unfiltered (gdb_stdlog, | |
2108 | "infrun: resume : clear step\n"); | |
a09dd441 | 2109 | step = 0; |
74609e71 YQ |
2110 | } |
2111 | ||
527159b7 | 2112 | if (debug_infrun) |
237fc4c9 | 2113 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 2114 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 2115 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
2116 | step, gdb_signal_to_symbol_string (sig), |
2117 | tp->control.trap_expected, | |
0d9a9a5f PA |
2118 | target_pid_to_str (inferior_ptid), |
2119 | paddress (gdbarch, pc)); | |
c906108c | 2120 | |
c2c6d25f JM |
2121 | /* Normally, by the time we reach `resume', the breakpoints are either |
2122 | removed or inserted, as appropriate. The exception is if we're sitting | |
2123 | at a permanent breakpoint; we need to step over it, but permanent | |
2124 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2125 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2126 | { |
af48d08f PA |
2127 | if (sig != GDB_SIGNAL_0) |
2128 | { | |
2129 | /* We have a signal to pass to the inferior. The resume | |
2130 | may, or may not take us to the signal handler. If this | |
2131 | is a step, we'll need to stop in the signal handler, if | |
2132 | there's one, (if the target supports stepping into | |
2133 | handlers), or in the next mainline instruction, if | |
2134 | there's no handler. If this is a continue, we need to be | |
2135 | sure to run the handler with all breakpoints inserted. | |
2136 | In all cases, set a breakpoint at the current address | |
2137 | (where the handler returns to), and once that breakpoint | |
2138 | is hit, resume skipping the permanent breakpoint. If | |
2139 | that breakpoint isn't hit, then we've stepped into the | |
2140 | signal handler (or hit some other event). We'll delete | |
2141 | the step-resume breakpoint then. */ | |
2142 | ||
2143 | if (debug_infrun) | |
2144 | fprintf_unfiltered (gdb_stdlog, | |
2145 | "infrun: resume: skipping permanent breakpoint, " | |
2146 | "deliver signal first\n"); | |
2147 | ||
2148 | clear_step_over_info (); | |
2149 | tp->control.trap_expected = 0; | |
2150 | ||
2151 | if (tp->control.step_resume_breakpoint == NULL) | |
2152 | { | |
2153 | /* Set a "high-priority" step-resume, as we don't want | |
2154 | user breakpoints at PC to trigger (again) when this | |
2155 | hits. */ | |
2156 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2157 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2158 | ||
2159 | tp->step_after_step_resume_breakpoint = step; | |
2160 | } | |
2161 | ||
2162 | insert_breakpoints (); | |
2163 | } | |
2164 | else | |
2165 | { | |
2166 | /* There's no signal to pass, we can go ahead and skip the | |
2167 | permanent breakpoint manually. */ | |
2168 | if (debug_infrun) | |
2169 | fprintf_unfiltered (gdb_stdlog, | |
2170 | "infrun: resume: skipping permanent breakpoint\n"); | |
2171 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
2172 | /* Update pc to reflect the new address from which we will | |
2173 | execute instructions. */ | |
2174 | pc = regcache_read_pc (regcache); | |
2175 | ||
2176 | if (step) | |
2177 | { | |
2178 | /* We've already advanced the PC, so the stepping part | |
2179 | is done. Now we need to arrange for a trap to be | |
2180 | reported to handle_inferior_event. Set a breakpoint | |
2181 | at the current PC, and run to it. Don't update | |
2182 | prev_pc, because if we end in | |
2183 | switch_back_to_stepping, we want the "expected thread | |
2184 | advanced also" branch to be taken. IOW, we don't | |
2185 | want this thread to step further from PC | |
2186 | (overstep). */ | |
2187 | insert_single_step_breakpoint (gdbarch, aspace, pc); | |
2188 | insert_breakpoints (); | |
2189 | ||
2190 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2191 | /* We're continuing with all breakpoints inserted. It's | |
2192 | safe to let the target bypass signals. */ | |
2193 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
2194 | /* ... and safe to let other threads run, according to | |
2195 | schedlock. */ | |
856e7dd6 | 2196 | resume_ptid = user_visible_resume_ptid (user_step); |
af48d08f PA |
2197 | target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
2198 | discard_cleanups (old_cleanups); | |
2199 | return; | |
2200 | } | |
2201 | } | |
6d350bb5 | 2202 | } |
c2c6d25f | 2203 | |
c1e36e3e PA |
2204 | /* If we have a breakpoint to step over, make sure to do a single |
2205 | step only. Same if we have software watchpoints. */ | |
2206 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2207 | tp->control.may_range_step = 0; | |
2208 | ||
237fc4c9 PA |
2209 | /* If enabled, step over breakpoints by executing a copy of the |
2210 | instruction at a different address. | |
2211 | ||
2212 | We can't use displaced stepping when we have a signal to deliver; | |
2213 | the comments for displaced_step_prepare explain why. The | |
2214 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2215 | signals' explain what we do instead. |
2216 | ||
2217 | We can't use displaced stepping when we are waiting for vfork_done | |
2218 | event, displaced stepping breaks the vfork child similarly as single | |
2219 | step software breakpoint. */ | |
515630c5 | 2220 | if (use_displaced_stepping (gdbarch) |
36728e82 | 2221 | && tp->control.trap_expected |
a493e3e2 | 2222 | && sig == GDB_SIGNAL_0 |
74609e71 | 2223 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2224 | { |
fc1cf338 PA |
2225 | struct displaced_step_inferior_state *displaced; |
2226 | ||
237fc4c9 | 2227 | if (!displaced_step_prepare (inferior_ptid)) |
d56b7306 VP |
2228 | { |
2229 | /* Got placed in displaced stepping queue. Will be resumed | |
2230 | later when all the currently queued displaced stepping | |
251bde03 PA |
2231 | requests finish. The thread is not executing at this |
2232 | point, and the call to set_executing will be made later. | |
2233 | But we need to call set_running here, since from the | |
2234 | user/frontend's point of view, threads were set running. | |
2235 | Unless we're calling an inferior function, as in that | |
2236 | case we pretend the inferior doesn't run at all. */ | |
2237 | if (!tp->control.in_infcall) | |
856e7dd6 | 2238 | set_running (user_visible_resume_ptid (user_step), 1); |
d56b7306 VP |
2239 | discard_cleanups (old_cleanups); |
2240 | return; | |
2241 | } | |
99e40580 | 2242 | |
ca7781d2 LM |
2243 | /* Update pc to reflect the new address from which we will execute |
2244 | instructions due to displaced stepping. */ | |
2245 | pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); | |
2246 | ||
fc1cf338 | 2247 | displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); |
a09dd441 PA |
2248 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, |
2249 | displaced->step_closure); | |
237fc4c9 PA |
2250 | } |
2251 | ||
2facfe5c | 2252 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2253 | else if (step) |
2facfe5c | 2254 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2255 | |
30852783 UW |
2256 | /* Currently, our software single-step implementation leads to different |
2257 | results than hardware single-stepping in one situation: when stepping | |
2258 | into delivering a signal which has an associated signal handler, | |
2259 | hardware single-step will stop at the first instruction of the handler, | |
2260 | while software single-step will simply skip execution of the handler. | |
2261 | ||
2262 | For now, this difference in behavior is accepted since there is no | |
2263 | easy way to actually implement single-stepping into a signal handler | |
2264 | without kernel support. | |
2265 | ||
2266 | However, there is one scenario where this difference leads to follow-on | |
2267 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2268 | and then single-stepping. In this case, the software single-step | |
2269 | behavior means that even if there is a *breakpoint* in the signal | |
2270 | handler, GDB still would not stop. | |
2271 | ||
2272 | Fortunately, we can at least fix this particular issue. We detect | |
2273 | here the case where we are about to deliver a signal while software | |
2274 | single-stepping with breakpoints removed. In this situation, we | |
2275 | revert the decisions to remove all breakpoints and insert single- | |
2276 | step breakpoints, and instead we install a step-resume breakpoint | |
2277 | at the current address, deliver the signal without stepping, and | |
2278 | once we arrive back at the step-resume breakpoint, actually step | |
2279 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2280 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2281 | && sig != GDB_SIGNAL_0 |
2282 | && step_over_info_valid_p ()) | |
30852783 UW |
2283 | { |
2284 | /* If we have nested signals or a pending signal is delivered | |
2285 | immediately after a handler returns, might might already have | |
2286 | a step-resume breakpoint set on the earlier handler. We cannot | |
2287 | set another step-resume breakpoint; just continue on until the | |
2288 | original breakpoint is hit. */ | |
2289 | if (tp->control.step_resume_breakpoint == NULL) | |
2290 | { | |
2c03e5be | 2291 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2292 | tp->step_after_step_resume_breakpoint = 1; |
2293 | } | |
2294 | ||
34b7e8a6 | 2295 | delete_single_step_breakpoints (tp); |
30852783 | 2296 | |
31e77af2 | 2297 | clear_step_over_info (); |
30852783 | 2298 | tp->control.trap_expected = 0; |
31e77af2 PA |
2299 | |
2300 | insert_breakpoints (); | |
30852783 UW |
2301 | } |
2302 | ||
b0f16a3e SM |
2303 | /* If STEP is set, it's a request to use hardware stepping |
2304 | facilities. But in that case, we should never | |
2305 | use singlestep breakpoint. */ | |
34b7e8a6 | 2306 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2307 | |
b0f16a3e SM |
2308 | /* Decide the set of threads to ask the target to resume. Start |
2309 | by assuming everything will be resumed, than narrow the set | |
2310 | by applying increasingly restricting conditions. */ | |
856e7dd6 | 2311 | resume_ptid = user_visible_resume_ptid (user_step); |
cd76b0b7 | 2312 | |
251bde03 PA |
2313 | /* Even if RESUME_PTID is a wildcard, and we end up resuming less |
2314 | (e.g., we might need to step over a breakpoint), from the | |
2315 | user/frontend's point of view, all threads in RESUME_PTID are now | |
2316 | running. Unless we're calling an inferior function, as in that | |
2317 | case pretend we inferior doesn't run at all. */ | |
2318 | if (!tp->control.in_infcall) | |
2319 | set_running (resume_ptid, 1); | |
2320 | ||
b0f16a3e | 2321 | /* Maybe resume a single thread after all. */ |
34b7e8a6 | 2322 | if ((step || thread_has_single_step_breakpoints_set (tp)) |
b0f16a3e SM |
2323 | && tp->control.trap_expected) |
2324 | { | |
2325 | /* We're allowing a thread to run past a breakpoint it has | |
2326 | hit, by single-stepping the thread with the breakpoint | |
2327 | removed. In which case, we need to single-step only this | |
2328 | thread, and keep others stopped, as they can miss this | |
2329 | breakpoint if allowed to run. */ | |
2330 | resume_ptid = inferior_ptid; | |
2331 | } | |
d4db2f36 | 2332 | |
7f5ef605 PA |
2333 | if (execution_direction != EXEC_REVERSE |
2334 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2335 | { |
7f5ef605 PA |
2336 | /* The only case we currently need to step a breakpoint |
2337 | instruction is when we have a signal to deliver. See | |
2338 | handle_signal_stop where we handle random signals that could | |
2339 | take out us out of the stepping range. Normally, in that | |
2340 | case we end up continuing (instead of stepping) over the | |
2341 | signal handler with a breakpoint at PC, but there are cases | |
2342 | where we should _always_ single-step, even if we have a | |
2343 | step-resume breakpoint, like when a software watchpoint is | |
2344 | set. Assuming single-stepping and delivering a signal at the | |
2345 | same time would takes us to the signal handler, then we could | |
2346 | have removed the breakpoint at PC to step over it. However, | |
2347 | some hardware step targets (like e.g., Mac OS) can't step | |
2348 | into signal handlers, and for those, we need to leave the | |
2349 | breakpoint at PC inserted, as otherwise if the handler | |
2350 | recurses and executes PC again, it'll miss the breakpoint. | |
2351 | So we leave the breakpoint inserted anyway, but we need to | |
2352 | record that we tried to step a breakpoint instruction, so | |
2353 | that adjust_pc_after_break doesn't end up confused. */ | |
2354 | gdb_assert (sig != GDB_SIGNAL_0); | |
2355 | ||
2356 | tp->stepped_breakpoint = 1; | |
2357 | ||
b0f16a3e SM |
2358 | /* Most targets can step a breakpoint instruction, thus |
2359 | executing it normally. But if this one cannot, just | |
2360 | continue and we will hit it anyway. */ | |
7f5ef605 | 2361 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2362 | step = 0; |
2363 | } | |
ef5cf84e | 2364 | |
b0f16a3e SM |
2365 | if (debug_displaced |
2366 | && use_displaced_stepping (gdbarch) | |
2367 | && tp->control.trap_expected) | |
2368 | { | |
2369 | struct regcache *resume_regcache = get_thread_regcache (resume_ptid); | |
2370 | struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache); | |
2371 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); | |
2372 | gdb_byte buf[4]; | |
2373 | ||
2374 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2375 | paddress (resume_gdbarch, actual_pc)); | |
2376 | read_memory (actual_pc, buf, sizeof (buf)); | |
2377 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2378 | } | |
237fc4c9 | 2379 | |
b0f16a3e SM |
2380 | if (tp->control.may_range_step) |
2381 | { | |
2382 | /* If we're resuming a thread with the PC out of the step | |
2383 | range, then we're doing some nested/finer run control | |
2384 | operation, like stepping the thread out of the dynamic | |
2385 | linker or the displaced stepping scratch pad. We | |
2386 | shouldn't have allowed a range step then. */ | |
2387 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2388 | } | |
c1e36e3e | 2389 | |
64ce06e4 | 2390 | do_target_resume (resume_ptid, step, sig); |
c906108c SS |
2391 | discard_cleanups (old_cleanups); |
2392 | } | |
2393 | \f | |
237fc4c9 | 2394 | /* Proceeding. */ |
c906108c SS |
2395 | |
2396 | /* Clear out all variables saying what to do when inferior is continued. | |
2397 | First do this, then set the ones you want, then call `proceed'. */ | |
2398 | ||
a7212384 UW |
2399 | static void |
2400 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2401 | { |
a7212384 UW |
2402 | if (debug_infrun) |
2403 | fprintf_unfiltered (gdb_stdlog, | |
2404 | "infrun: clear_proceed_status_thread (%s)\n", | |
2405 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 2406 | |
70509625 PA |
2407 | /* If this signal should not be seen by program, give it zero. |
2408 | Used for debugging signals. */ | |
2409 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2410 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2411 | ||
16c381f0 JK |
2412 | tp->control.trap_expected = 0; |
2413 | tp->control.step_range_start = 0; | |
2414 | tp->control.step_range_end = 0; | |
c1e36e3e | 2415 | tp->control.may_range_step = 0; |
16c381f0 JK |
2416 | tp->control.step_frame_id = null_frame_id; |
2417 | tp->control.step_stack_frame_id = null_frame_id; | |
2418 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2419 | tp->control.step_start_function = NULL; |
a7212384 | 2420 | tp->stop_requested = 0; |
4e1c45ea | 2421 | |
16c381f0 | 2422 | tp->control.stop_step = 0; |
32400beb | 2423 | |
16c381f0 | 2424 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2425 | |
17b2616c | 2426 | tp->control.command_interp = NULL; |
856e7dd6 | 2427 | tp->control.stepping_command = 0; |
17b2616c | 2428 | |
a7212384 | 2429 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2430 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2431 | } |
32400beb | 2432 | |
a7212384 | 2433 | void |
70509625 | 2434 | clear_proceed_status (int step) |
a7212384 | 2435 | { |
6c95b8df PA |
2436 | if (!non_stop) |
2437 | { | |
70509625 PA |
2438 | struct thread_info *tp; |
2439 | ptid_t resume_ptid; | |
2440 | ||
2441 | resume_ptid = user_visible_resume_ptid (step); | |
2442 | ||
2443 | /* In all-stop mode, delete the per-thread status of all threads | |
2444 | we're about to resume, implicitly and explicitly. */ | |
2445 | ALL_NON_EXITED_THREADS (tp) | |
2446 | { | |
2447 | if (!ptid_match (tp->ptid, resume_ptid)) | |
2448 | continue; | |
2449 | clear_proceed_status_thread (tp); | |
2450 | } | |
6c95b8df PA |
2451 | } |
2452 | ||
a7212384 UW |
2453 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2454 | { | |
2455 | struct inferior *inferior; | |
2456 | ||
2457 | if (non_stop) | |
2458 | { | |
6c95b8df PA |
2459 | /* If in non-stop mode, only delete the per-thread status of |
2460 | the current thread. */ | |
a7212384 UW |
2461 | clear_proceed_status_thread (inferior_thread ()); |
2462 | } | |
6c95b8df | 2463 | |
d6b48e9c | 2464 | inferior = current_inferior (); |
16c381f0 | 2465 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2466 | } |
2467 | ||
c906108c | 2468 | stop_after_trap = 0; |
f3b1572e | 2469 | |
31e77af2 PA |
2470 | clear_step_over_info (); |
2471 | ||
f3b1572e | 2472 | observer_notify_about_to_proceed (); |
c906108c | 2473 | |
d5c31457 UW |
2474 | if (stop_registers) |
2475 | { | |
2476 | regcache_xfree (stop_registers); | |
2477 | stop_registers = NULL; | |
2478 | } | |
c906108c SS |
2479 | } |
2480 | ||
99619bea PA |
2481 | /* Returns true if TP is still stopped at a breakpoint that needs |
2482 | stepping-over in order to make progress. If the breakpoint is gone | |
2483 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2484 | |
2485 | static int | |
99619bea PA |
2486 | thread_still_needs_step_over (struct thread_info *tp) |
2487 | { | |
2488 | if (tp->stepping_over_breakpoint) | |
2489 | { | |
2490 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
2491 | ||
2492 | if (breakpoint_here_p (get_regcache_aspace (regcache), | |
af48d08f PA |
2493 | regcache_read_pc (regcache)) |
2494 | == ordinary_breakpoint_here) | |
99619bea PA |
2495 | return 1; |
2496 | ||
2497 | tp->stepping_over_breakpoint = 0; | |
2498 | } | |
2499 | ||
2500 | return 0; | |
2501 | } | |
2502 | ||
483805cf PA |
2503 | /* Returns true if scheduler locking applies. STEP indicates whether |
2504 | we're about to do a step/next-like command to a thread. */ | |
2505 | ||
2506 | static int | |
856e7dd6 | 2507 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2508 | { |
2509 | return (scheduler_mode == schedlock_on | |
2510 | || (scheduler_mode == schedlock_step | |
856e7dd6 | 2511 | && tp->control.stepping_command)); |
483805cf PA |
2512 | } |
2513 | ||
99619bea PA |
2514 | /* Look a thread other than EXCEPT that has previously reported a |
2515 | breakpoint event, and thus needs a step-over in order to make | |
856e7dd6 | 2516 | progress. Returns NULL is none is found. */ |
99619bea PA |
2517 | |
2518 | static struct thread_info * | |
856e7dd6 | 2519 | find_thread_needs_step_over (struct thread_info *except) |
ea67f13b | 2520 | { |
99619bea | 2521 | struct thread_info *tp, *current; |
5a437975 DE |
2522 | |
2523 | /* With non-stop mode on, threads are always handled individually. */ | |
2524 | gdb_assert (! non_stop); | |
ea67f13b | 2525 | |
99619bea | 2526 | current = inferior_thread (); |
d4db2f36 | 2527 | |
99619bea PA |
2528 | /* If scheduler locking applies, we can avoid iterating over all |
2529 | threads. */ | |
856e7dd6 | 2530 | if (schedlock_applies (except)) |
ea67f13b | 2531 | { |
99619bea PA |
2532 | if (except != current |
2533 | && thread_still_needs_step_over (current)) | |
2534 | return current; | |
515630c5 | 2535 | |
99619bea PA |
2536 | return NULL; |
2537 | } | |
0d9a9a5f | 2538 | |
034f788c | 2539 | ALL_NON_EXITED_THREADS (tp) |
99619bea PA |
2540 | { |
2541 | /* Ignore the EXCEPT thread. */ | |
2542 | if (tp == except) | |
2543 | continue; | |
2544 | /* Ignore threads of processes we're not resuming. */ | |
2545 | if (!sched_multi | |
2546 | && ptid_get_pid (tp->ptid) != ptid_get_pid (inferior_ptid)) | |
2547 | continue; | |
2548 | ||
2549 | if (thread_still_needs_step_over (tp)) | |
2550 | return tp; | |
ea67f13b DJ |
2551 | } |
2552 | ||
99619bea | 2553 | return NULL; |
ea67f13b | 2554 | } |
e4846b08 | 2555 | |
c906108c SS |
2556 | /* Basic routine for continuing the program in various fashions. |
2557 | ||
2558 | ADDR is the address to resume at, or -1 for resume where stopped. | |
2559 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 2560 | or -1 for act according to how it stopped. |
c906108c | 2561 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
2562 | -1 means return after that and print nothing. |
2563 | You should probably set various step_... variables | |
2564 | before calling here, if you are stepping. | |
c906108c SS |
2565 | |
2566 | You should call clear_proceed_status before calling proceed. */ | |
2567 | ||
2568 | void | |
64ce06e4 | 2569 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2570 | { |
e58b0e63 PA |
2571 | struct regcache *regcache; |
2572 | struct gdbarch *gdbarch; | |
4e1c45ea | 2573 | struct thread_info *tp; |
e58b0e63 | 2574 | CORE_ADDR pc; |
6c95b8df | 2575 | struct address_space *aspace; |
c906108c | 2576 | |
e58b0e63 PA |
2577 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2578 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2579 | resuming the current thread. */ | |
2580 | if (!follow_fork ()) | |
2581 | { | |
2582 | /* The target for some reason decided not to resume. */ | |
2583 | normal_stop (); | |
f148b27e PA |
2584 | if (target_can_async_p ()) |
2585 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2586 | return; |
2587 | } | |
2588 | ||
842951eb PA |
2589 | /* We'll update this if & when we switch to a new thread. */ |
2590 | previous_inferior_ptid = inferior_ptid; | |
2591 | ||
e58b0e63 PA |
2592 | regcache = get_current_regcache (); |
2593 | gdbarch = get_regcache_arch (regcache); | |
6c95b8df | 2594 | aspace = get_regcache_aspace (regcache); |
e58b0e63 | 2595 | pc = regcache_read_pc (regcache); |
2adfaa28 | 2596 | tp = inferior_thread (); |
e58b0e63 | 2597 | |
99619bea PA |
2598 | /* Fill in with reasonable starting values. */ |
2599 | init_thread_stepping_state (tp); | |
2600 | ||
2acceee2 | 2601 | if (addr == (CORE_ADDR) -1) |
c906108c | 2602 | { |
af48d08f PA |
2603 | if (pc == stop_pc |
2604 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here | |
b2175913 | 2605 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2606 | /* There is a breakpoint at the address we will resume at, |
2607 | step one instruction before inserting breakpoints so that | |
2608 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2609 | breakpoint). |
2610 | ||
2611 | Note, we don't do this in reverse, because we won't | |
2612 | actually be executing the breakpoint insn anyway. | |
2613 | We'll be (un-)executing the previous instruction. */ | |
99619bea | 2614 | tp->stepping_over_breakpoint = 1; |
515630c5 UW |
2615 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2616 | && gdbarch_single_step_through_delay (gdbarch, | |
2617 | get_current_frame ())) | |
3352ef37 AC |
2618 | /* We stepped onto an instruction that needs to be stepped |
2619 | again before re-inserting the breakpoint, do so. */ | |
99619bea | 2620 | tp->stepping_over_breakpoint = 1; |
c906108c SS |
2621 | } |
2622 | else | |
2623 | { | |
515630c5 | 2624 | regcache_write_pc (regcache, addr); |
c906108c SS |
2625 | } |
2626 | ||
70509625 PA |
2627 | if (siggnal != GDB_SIGNAL_DEFAULT) |
2628 | tp->suspend.stop_signal = siggnal; | |
2629 | ||
17b2616c PA |
2630 | /* Record the interpreter that issued the execution command that |
2631 | caused this thread to resume. If the top level interpreter is | |
2632 | MI/async, and the execution command was a CLI command | |
2633 | (next/step/etc.), we'll want to print stop event output to the MI | |
2634 | console channel (the stepped-to line, etc.), as if the user | |
2635 | entered the execution command on a real GDB console. */ | |
2636 | inferior_thread ()->control.command_interp = command_interp (); | |
2637 | ||
527159b7 | 2638 | if (debug_infrun) |
8a9de0e4 | 2639 | fprintf_unfiltered (gdb_stdlog, |
64ce06e4 | 2640 | "infrun: proceed (addr=%s, signal=%s)\n", |
c9737c08 | 2641 | paddress (gdbarch, addr), |
64ce06e4 | 2642 | gdb_signal_to_symbol_string (siggnal)); |
527159b7 | 2643 | |
94cc34af PA |
2644 | if (non_stop) |
2645 | /* In non-stop, each thread is handled individually. The context | |
2646 | must already be set to the right thread here. */ | |
2647 | ; | |
2648 | else | |
2649 | { | |
99619bea PA |
2650 | struct thread_info *step_over; |
2651 | ||
94cc34af PA |
2652 | /* In a multi-threaded task we may select another thread and |
2653 | then continue or step. | |
c906108c | 2654 | |
94cc34af PA |
2655 | But if the old thread was stopped at a breakpoint, it will |
2656 | immediately cause another breakpoint stop without any | |
2657 | execution (i.e. it will report a breakpoint hit incorrectly). | |
2658 | So we must step over it first. | |
c906108c | 2659 | |
99619bea PA |
2660 | Look for a thread other than the current (TP) that reported a |
2661 | breakpoint hit and hasn't been resumed yet since. */ | |
856e7dd6 | 2662 | step_over = find_thread_needs_step_over (tp); |
99619bea | 2663 | if (step_over != NULL) |
2adfaa28 | 2664 | { |
99619bea PA |
2665 | if (debug_infrun) |
2666 | fprintf_unfiltered (gdb_stdlog, | |
2667 | "infrun: need to step-over [%s] first\n", | |
2668 | target_pid_to_str (step_over->ptid)); | |
2669 | ||
2670 | /* Store the prev_pc for the stepping thread too, needed by | |
2671 | switch_back_to_stepping thread. */ | |
2672 | tp->prev_pc = regcache_read_pc (get_current_regcache ()); | |
2673 | switch_to_thread (step_over->ptid); | |
2674 | tp = step_over; | |
2adfaa28 | 2675 | } |
94cc34af | 2676 | } |
c906108c | 2677 | |
31e77af2 PA |
2678 | /* If we need to step over a breakpoint, and we're not using |
2679 | displaced stepping to do so, insert all breakpoints (watchpoints, | |
2680 | etc.) but the one we're stepping over, step one instruction, and | |
2681 | then re-insert the breakpoint when that step is finished. */ | |
99619bea | 2682 | if (tp->stepping_over_breakpoint && !use_displaced_stepping (gdbarch)) |
30852783 | 2683 | { |
31e77af2 PA |
2684 | struct regcache *regcache = get_current_regcache (); |
2685 | ||
2686 | set_step_over_info (get_regcache_aspace (regcache), | |
963f9c80 | 2687 | regcache_read_pc (regcache), 0); |
30852783 | 2688 | } |
31e77af2 PA |
2689 | else |
2690 | clear_step_over_info (); | |
30852783 | 2691 | |
31e77af2 | 2692 | insert_breakpoints (); |
30852783 | 2693 | |
99619bea PA |
2694 | tp->control.trap_expected = tp->stepping_over_breakpoint; |
2695 | ||
c906108c SS |
2696 | annotate_starting (); |
2697 | ||
2698 | /* Make sure that output from GDB appears before output from the | |
2699 | inferior. */ | |
2700 | gdb_flush (gdb_stdout); | |
2701 | ||
e4846b08 | 2702 | /* Refresh prev_pc value just prior to resuming. This used to be |
22bcd14b | 2703 | done in stop_waiting, however, setting prev_pc there did not handle |
e4846b08 JJ |
2704 | scenarios such as inferior function calls or returning from |
2705 | a function via the return command. In those cases, the prev_pc | |
2706 | value was not set properly for subsequent commands. The prev_pc value | |
2707 | is used to initialize the starting line number in the ecs. With an | |
2708 | invalid value, the gdb next command ends up stopping at the position | |
2709 | represented by the next line table entry past our start position. | |
2710 | On platforms that generate one line table entry per line, this | |
2711 | is not a problem. However, on the ia64, the compiler generates | |
2712 | extraneous line table entries that do not increase the line number. | |
2713 | When we issue the gdb next command on the ia64 after an inferior call | |
2714 | or a return command, we often end up a few instructions forward, still | |
2715 | within the original line we started. | |
2716 | ||
d5cd6034 JB |
2717 | An attempt was made to refresh the prev_pc at the same time the |
2718 | execution_control_state is initialized (for instance, just before | |
2719 | waiting for an inferior event). But this approach did not work | |
2720 | because of platforms that use ptrace, where the pc register cannot | |
2721 | be read unless the inferior is stopped. At that point, we are not | |
2722 | guaranteed the inferior is stopped and so the regcache_read_pc() call | |
2723 | can fail. Setting the prev_pc value here ensures the value is updated | |
2724 | correctly when the inferior is stopped. */ | |
4e1c45ea | 2725 | tp->prev_pc = regcache_read_pc (get_current_regcache ()); |
e4846b08 | 2726 | |
c906108c | 2727 | /* Resume inferior. */ |
64ce06e4 | 2728 | resume (tp->suspend.stop_signal); |
c906108c SS |
2729 | |
2730 | /* Wait for it to stop (if not standalone) | |
2731 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 | 2732 | /* Do this only if we are not using the event loop, or if the target |
1777feb0 | 2733 | does not support asynchronous execution. */ |
362646f5 | 2734 | if (!target_can_async_p ()) |
43ff13b4 | 2735 | { |
e4c8541f | 2736 | wait_for_inferior (); |
43ff13b4 JM |
2737 | normal_stop (); |
2738 | } | |
c906108c | 2739 | } |
c906108c SS |
2740 | \f |
2741 | ||
2742 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 2743 | |
c906108c | 2744 | void |
8621d6a9 | 2745 | start_remote (int from_tty) |
c906108c | 2746 | { |
d6b48e9c | 2747 | struct inferior *inferior; |
d6b48e9c PA |
2748 | |
2749 | inferior = current_inferior (); | |
16c381f0 | 2750 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; |
43ff13b4 | 2751 | |
1777feb0 | 2752 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 2753 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 2754 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
2755 | nothing is returned (instead of just blocking). Because of this, |
2756 | targets expecting an immediate response need to, internally, set | |
2757 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 2758 | timeout. */ |
6426a772 JM |
2759 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
2760 | differentiate to its caller what the state of the target is after | |
2761 | the initial open has been performed. Here we're assuming that | |
2762 | the target has stopped. It should be possible to eventually have | |
2763 | target_open() return to the caller an indication that the target | |
2764 | is currently running and GDB state should be set to the same as | |
1777feb0 | 2765 | for an async run. */ |
e4c8541f | 2766 | wait_for_inferior (); |
8621d6a9 DJ |
2767 | |
2768 | /* Now that the inferior has stopped, do any bookkeeping like | |
2769 | loading shared libraries. We want to do this before normal_stop, | |
2770 | so that the displayed frame is up to date. */ | |
2771 | post_create_inferior (¤t_target, from_tty); | |
2772 | ||
6426a772 | 2773 | normal_stop (); |
c906108c SS |
2774 | } |
2775 | ||
2776 | /* Initialize static vars when a new inferior begins. */ | |
2777 | ||
2778 | void | |
96baa820 | 2779 | init_wait_for_inferior (void) |
c906108c SS |
2780 | { |
2781 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 2782 | |
c906108c SS |
2783 | breakpoint_init_inferior (inf_starting); |
2784 | ||
70509625 | 2785 | clear_proceed_status (0); |
9f976b41 | 2786 | |
ca005067 | 2787 | target_last_wait_ptid = minus_one_ptid; |
237fc4c9 | 2788 | |
842951eb | 2789 | previous_inferior_ptid = inferior_ptid; |
0d1e5fa7 | 2790 | |
edb3359d DJ |
2791 | /* Discard any skipped inlined frames. */ |
2792 | clear_inline_frame_state (minus_one_ptid); | |
c906108c | 2793 | } |
237fc4c9 | 2794 | |
c906108c | 2795 | \f |
0d1e5fa7 PA |
2796 | /* Data to be passed around while handling an event. This data is |
2797 | discarded between events. */ | |
c5aa993b | 2798 | struct execution_control_state |
488f131b | 2799 | { |
0d1e5fa7 | 2800 | ptid_t ptid; |
4e1c45ea PA |
2801 | /* The thread that got the event, if this was a thread event; NULL |
2802 | otherwise. */ | |
2803 | struct thread_info *event_thread; | |
2804 | ||
488f131b | 2805 | struct target_waitstatus ws; |
7e324e48 | 2806 | int stop_func_filled_in; |
488f131b JB |
2807 | CORE_ADDR stop_func_start; |
2808 | CORE_ADDR stop_func_end; | |
2c02bd72 | 2809 | const char *stop_func_name; |
488f131b | 2810 | int wait_some_more; |
4f5d7f63 | 2811 | |
2adfaa28 PA |
2812 | /* True if the event thread hit the single-step breakpoint of |
2813 | another thread. Thus the event doesn't cause a stop, the thread | |
2814 | needs to be single-stepped past the single-step breakpoint before | |
2815 | we can switch back to the original stepping thread. */ | |
2816 | int hit_singlestep_breakpoint; | |
488f131b JB |
2817 | }; |
2818 | ||
ec9499be | 2819 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 2820 | |
568d6575 UW |
2821 | static void handle_step_into_function (struct gdbarch *gdbarch, |
2822 | struct execution_control_state *ecs); | |
2823 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
2824 | struct execution_control_state *ecs); | |
4f5d7f63 | 2825 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 2826 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 2827 | struct frame_info *); |
611c83ae | 2828 | |
bdc36728 | 2829 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 2830 | static void stop_waiting (struct execution_control_state *ecs); |
104c1213 | 2831 | static void prepare_to_wait (struct execution_control_state *ecs); |
d4f3574e | 2832 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 2833 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 2834 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 2835 | |
252fbfc8 PA |
2836 | /* Callback for iterate over threads. If the thread is stopped, but |
2837 | the user/frontend doesn't know about that yet, go through | |
2838 | normal_stop, as if the thread had just stopped now. ARG points at | |
2839 | a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If | |
2840 | ptid_is_pid(PTID) is true, applies to all threads of the process | |
2841 | pointed at by PTID. Otherwise, apply only to the thread pointed by | |
2842 | PTID. */ | |
2843 | ||
2844 | static int | |
2845 | infrun_thread_stop_requested_callback (struct thread_info *info, void *arg) | |
2846 | { | |
2847 | ptid_t ptid = * (ptid_t *) arg; | |
2848 | ||
2849 | if ((ptid_equal (info->ptid, ptid) | |
2850 | || ptid_equal (minus_one_ptid, ptid) | |
2851 | || (ptid_is_pid (ptid) | |
2852 | && ptid_get_pid (ptid) == ptid_get_pid (info->ptid))) | |
2853 | && is_running (info->ptid) | |
2854 | && !is_executing (info->ptid)) | |
2855 | { | |
2856 | struct cleanup *old_chain; | |
2857 | struct execution_control_state ecss; | |
2858 | struct execution_control_state *ecs = &ecss; | |
2859 | ||
2860 | memset (ecs, 0, sizeof (*ecs)); | |
2861 | ||
2862 | old_chain = make_cleanup_restore_current_thread (); | |
2863 | ||
f15cb84a YQ |
2864 | overlay_cache_invalid = 1; |
2865 | /* Flush target cache before starting to handle each event. | |
2866 | Target was running and cache could be stale. This is just a | |
2867 | heuristic. Running threads may modify target memory, but we | |
2868 | don't get any event. */ | |
2869 | target_dcache_invalidate (); | |
2870 | ||
252fbfc8 PA |
2871 | /* Go through handle_inferior_event/normal_stop, so we always |
2872 | have consistent output as if the stop event had been | |
2873 | reported. */ | |
2874 | ecs->ptid = info->ptid; | |
e09875d4 | 2875 | ecs->event_thread = find_thread_ptid (info->ptid); |
252fbfc8 | 2876 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; |
a493e3e2 | 2877 | ecs->ws.value.sig = GDB_SIGNAL_0; |
252fbfc8 PA |
2878 | |
2879 | handle_inferior_event (ecs); | |
2880 | ||
2881 | if (!ecs->wait_some_more) | |
2882 | { | |
2883 | struct thread_info *tp; | |
2884 | ||
2885 | normal_stop (); | |
2886 | ||
fa4cd53f | 2887 | /* Finish off the continuations. */ |
252fbfc8 | 2888 | tp = inferior_thread (); |
fa4cd53f PA |
2889 | do_all_intermediate_continuations_thread (tp, 1); |
2890 | do_all_continuations_thread (tp, 1); | |
252fbfc8 PA |
2891 | } |
2892 | ||
2893 | do_cleanups (old_chain); | |
2894 | } | |
2895 | ||
2896 | return 0; | |
2897 | } | |
2898 | ||
2899 | /* This function is attached as a "thread_stop_requested" observer. | |
2900 | Cleanup local state that assumed the PTID was to be resumed, and | |
2901 | report the stop to the frontend. */ | |
2902 | ||
2c0b251b | 2903 | static void |
252fbfc8 PA |
2904 | infrun_thread_stop_requested (ptid_t ptid) |
2905 | { | |
fc1cf338 | 2906 | struct displaced_step_inferior_state *displaced; |
252fbfc8 PA |
2907 | |
2908 | /* PTID was requested to stop. Remove it from the displaced | |
2909 | stepping queue, so we don't try to resume it automatically. */ | |
fc1cf338 PA |
2910 | |
2911 | for (displaced = displaced_step_inferior_states; | |
2912 | displaced; | |
2913 | displaced = displaced->next) | |
252fbfc8 | 2914 | { |
fc1cf338 | 2915 | struct displaced_step_request *it, **prev_next_p; |
252fbfc8 | 2916 | |
fc1cf338 PA |
2917 | it = displaced->step_request_queue; |
2918 | prev_next_p = &displaced->step_request_queue; | |
2919 | while (it) | |
252fbfc8 | 2920 | { |
fc1cf338 PA |
2921 | if (ptid_match (it->ptid, ptid)) |
2922 | { | |
2923 | *prev_next_p = it->next; | |
2924 | it->next = NULL; | |
2925 | xfree (it); | |
2926 | } | |
252fbfc8 | 2927 | else |
fc1cf338 PA |
2928 | { |
2929 | prev_next_p = &it->next; | |
2930 | } | |
252fbfc8 | 2931 | |
fc1cf338 | 2932 | it = *prev_next_p; |
252fbfc8 | 2933 | } |
252fbfc8 PA |
2934 | } |
2935 | ||
2936 | iterate_over_threads (infrun_thread_stop_requested_callback, &ptid); | |
2937 | } | |
2938 | ||
a07daef3 PA |
2939 | static void |
2940 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
2941 | { | |
2942 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
2943 | nullify_last_target_wait_ptid (); | |
2944 | } | |
2945 | ||
0cbcdb96 PA |
2946 | /* Delete the step resume, single-step and longjmp/exception resume |
2947 | breakpoints of TP. */ | |
4e1c45ea | 2948 | |
0cbcdb96 PA |
2949 | static void |
2950 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 2951 | { |
0cbcdb96 PA |
2952 | delete_step_resume_breakpoint (tp); |
2953 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 2954 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
2955 | } |
2956 | ||
0cbcdb96 PA |
2957 | /* If the target still has execution, call FUNC for each thread that |
2958 | just stopped. In all-stop, that's all the non-exited threads; in | |
2959 | non-stop, that's the current thread, only. */ | |
2960 | ||
2961 | typedef void (*for_each_just_stopped_thread_callback_func) | |
2962 | (struct thread_info *tp); | |
4e1c45ea PA |
2963 | |
2964 | static void | |
0cbcdb96 | 2965 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 2966 | { |
0cbcdb96 | 2967 | if (!target_has_execution || ptid_equal (inferior_ptid, null_ptid)) |
4e1c45ea PA |
2968 | return; |
2969 | ||
2970 | if (non_stop) | |
2971 | { | |
0cbcdb96 PA |
2972 | /* If in non-stop mode, only the current thread stopped. */ |
2973 | func (inferior_thread ()); | |
4e1c45ea PA |
2974 | } |
2975 | else | |
0cbcdb96 PA |
2976 | { |
2977 | struct thread_info *tp; | |
2978 | ||
2979 | /* In all-stop mode, all threads have stopped. */ | |
2980 | ALL_NON_EXITED_THREADS (tp) | |
2981 | { | |
2982 | func (tp); | |
2983 | } | |
2984 | } | |
2985 | } | |
2986 | ||
2987 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
2988 | the threads that just stopped. */ | |
2989 | ||
2990 | static void | |
2991 | delete_just_stopped_threads_infrun_breakpoints (void) | |
2992 | { | |
2993 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
2994 | } |
2995 | ||
2996 | /* Delete the single-step breakpoints of the threads that just | |
2997 | stopped. */ | |
7c16b83e | 2998 | |
34b7e8a6 PA |
2999 | static void |
3000 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3001 | { | |
3002 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3003 | } |
3004 | ||
1777feb0 | 3005 | /* A cleanup wrapper. */ |
4e1c45ea PA |
3006 | |
3007 | static void | |
0cbcdb96 | 3008 | delete_just_stopped_threads_infrun_breakpoints_cleanup (void *arg) |
4e1c45ea | 3009 | { |
0cbcdb96 | 3010 | delete_just_stopped_threads_infrun_breakpoints (); |
4e1c45ea PA |
3011 | } |
3012 | ||
223698f8 DE |
3013 | /* Pretty print the results of target_wait, for debugging purposes. */ |
3014 | ||
3015 | static void | |
3016 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, | |
3017 | const struct target_waitstatus *ws) | |
3018 | { | |
3019 | char *status_string = target_waitstatus_to_string (ws); | |
3020 | struct ui_file *tmp_stream = mem_fileopen (); | |
3021 | char *text; | |
223698f8 DE |
3022 | |
3023 | /* The text is split over several lines because it was getting too long. | |
3024 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3025 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3026 | is set. */ | |
3027 | ||
3028 | fprintf_unfiltered (tmp_stream, | |
dfd4cc63 LM |
3029 | "infrun: target_wait (%d", ptid_get_pid (waiton_ptid)); |
3030 | if (ptid_get_pid (waiton_ptid) != -1) | |
223698f8 DE |
3031 | fprintf_unfiltered (tmp_stream, |
3032 | " [%s]", target_pid_to_str (waiton_ptid)); | |
3033 | fprintf_unfiltered (tmp_stream, ", status) =\n"); | |
3034 | fprintf_unfiltered (tmp_stream, | |
3035 | "infrun: %d [%s],\n", | |
dfd4cc63 LM |
3036 | ptid_get_pid (result_ptid), |
3037 | target_pid_to_str (result_ptid)); | |
223698f8 DE |
3038 | fprintf_unfiltered (tmp_stream, |
3039 | "infrun: %s\n", | |
3040 | status_string); | |
3041 | ||
759ef836 | 3042 | text = ui_file_xstrdup (tmp_stream, NULL); |
223698f8 DE |
3043 | |
3044 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3045 | a gcc error: the format attribute requires a string literal. */ | |
3046 | fprintf_unfiltered (gdb_stdlog, "%s", text); | |
3047 | ||
3048 | xfree (status_string); | |
3049 | xfree (text); | |
3050 | ui_file_delete (tmp_stream); | |
3051 | } | |
3052 | ||
24291992 PA |
3053 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3054 | detaching while a thread is displaced stepping is a recipe for | |
3055 | crashing it, as nothing would readjust the PC out of the scratch | |
3056 | pad. */ | |
3057 | ||
3058 | void | |
3059 | prepare_for_detach (void) | |
3060 | { | |
3061 | struct inferior *inf = current_inferior (); | |
3062 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
3063 | struct cleanup *old_chain_1; | |
3064 | struct displaced_step_inferior_state *displaced; | |
3065 | ||
3066 | displaced = get_displaced_stepping_state (inf->pid); | |
3067 | ||
3068 | /* Is any thread of this process displaced stepping? If not, | |
3069 | there's nothing else to do. */ | |
3070 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
3071 | return; | |
3072 | ||
3073 | if (debug_infrun) | |
3074 | fprintf_unfiltered (gdb_stdlog, | |
3075 | "displaced-stepping in-process while detaching"); | |
3076 | ||
3077 | old_chain_1 = make_cleanup_restore_integer (&inf->detaching); | |
3078 | inf->detaching = 1; | |
3079 | ||
3080 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
3081 | { | |
3082 | struct cleanup *old_chain_2; | |
3083 | struct execution_control_state ecss; | |
3084 | struct execution_control_state *ecs; | |
3085 | ||
3086 | ecs = &ecss; | |
3087 | memset (ecs, 0, sizeof (*ecs)); | |
3088 | ||
3089 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3090 | /* Flush target cache before starting to handle each event. |
3091 | Target was running and cache could be stale. This is just a | |
3092 | heuristic. Running threads may modify target memory, but we | |
3093 | don't get any event. */ | |
3094 | target_dcache_invalidate (); | |
24291992 | 3095 | |
24291992 PA |
3096 | if (deprecated_target_wait_hook) |
3097 | ecs->ptid = deprecated_target_wait_hook (pid_ptid, &ecs->ws, 0); | |
3098 | else | |
3099 | ecs->ptid = target_wait (pid_ptid, &ecs->ws, 0); | |
3100 | ||
3101 | if (debug_infrun) | |
3102 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3103 | ||
3104 | /* If an error happens while handling the event, propagate GDB's | |
3105 | knowledge of the executing state to the frontend/user running | |
3106 | state. */ | |
3e43a32a MS |
3107 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, |
3108 | &minus_one_ptid); | |
24291992 PA |
3109 | |
3110 | /* Now figure out what to do with the result of the result. */ | |
3111 | handle_inferior_event (ecs); | |
3112 | ||
3113 | /* No error, don't finish the state yet. */ | |
3114 | discard_cleanups (old_chain_2); | |
3115 | ||
3116 | /* Breakpoints and watchpoints are not installed on the target | |
3117 | at this point, and signals are passed directly to the | |
3118 | inferior, so this must mean the process is gone. */ | |
3119 | if (!ecs->wait_some_more) | |
3120 | { | |
3121 | discard_cleanups (old_chain_1); | |
3122 | error (_("Program exited while detaching")); | |
3123 | } | |
3124 | } | |
3125 | ||
3126 | discard_cleanups (old_chain_1); | |
3127 | } | |
3128 | ||
cd0fc7c3 | 3129 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3130 | |
cd0fc7c3 SS |
3131 | If inferior gets a signal, we may decide to start it up again |
3132 | instead of returning. That is why there is a loop in this function. | |
3133 | When this function actually returns it means the inferior | |
3134 | should be left stopped and GDB should read more commands. */ | |
3135 | ||
3136 | void | |
e4c8541f | 3137 | wait_for_inferior (void) |
cd0fc7c3 SS |
3138 | { |
3139 | struct cleanup *old_cleanups; | |
c906108c | 3140 | |
527159b7 | 3141 | if (debug_infrun) |
ae123ec6 | 3142 | fprintf_unfiltered |
e4c8541f | 3143 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3144 | |
0cbcdb96 PA |
3145 | old_cleanups |
3146 | = make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, | |
3147 | NULL); | |
cd0fc7c3 | 3148 | |
c906108c SS |
3149 | while (1) |
3150 | { | |
ae25568b PA |
3151 | struct execution_control_state ecss; |
3152 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 3153 | struct cleanup *old_chain; |
963f9c80 | 3154 | ptid_t waiton_ptid = minus_one_ptid; |
29f49a6a | 3155 | |
ae25568b PA |
3156 | memset (ecs, 0, sizeof (*ecs)); |
3157 | ||
ec9499be | 3158 | overlay_cache_invalid = 1; |
ec9499be | 3159 | |
f15cb84a YQ |
3160 | /* Flush target cache before starting to handle each event. |
3161 | Target was running and cache could be stale. This is just a | |
3162 | heuristic. Running threads may modify target memory, but we | |
3163 | don't get any event. */ | |
3164 | target_dcache_invalidate (); | |
3165 | ||
9a4105ab | 3166 | if (deprecated_target_wait_hook) |
47608cb1 | 3167 | ecs->ptid = deprecated_target_wait_hook (waiton_ptid, &ecs->ws, 0); |
cd0fc7c3 | 3168 | else |
47608cb1 | 3169 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 3170 | |
f00150c9 | 3171 | if (debug_infrun) |
223698f8 | 3172 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3173 | |
29f49a6a PA |
3174 | /* If an error happens while handling the event, propagate GDB's |
3175 | knowledge of the executing state to the frontend/user running | |
3176 | state. */ | |
3177 | old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
3178 | ||
cd0fc7c3 SS |
3179 | /* Now figure out what to do with the result of the result. */ |
3180 | handle_inferior_event (ecs); | |
c906108c | 3181 | |
29f49a6a PA |
3182 | /* No error, don't finish the state yet. */ |
3183 | discard_cleanups (old_chain); | |
3184 | ||
cd0fc7c3 SS |
3185 | if (!ecs->wait_some_more) |
3186 | break; | |
3187 | } | |
4e1c45ea | 3188 | |
cd0fc7c3 SS |
3189 | do_cleanups (old_cleanups); |
3190 | } | |
c906108c | 3191 | |
d3d4baed PA |
3192 | /* Cleanup that reinstalls the readline callback handler, if the |
3193 | target is running in the background. If while handling the target | |
3194 | event something triggered a secondary prompt, like e.g., a | |
3195 | pagination prompt, we'll have removed the callback handler (see | |
3196 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3197 | event loop, ready to process further input. Note this has no | |
3198 | effect if the handler hasn't actually been removed, because calling | |
3199 | rl_callback_handler_install resets the line buffer, thus losing | |
3200 | input. */ | |
3201 | ||
3202 | static void | |
3203 | reinstall_readline_callback_handler_cleanup (void *arg) | |
3204 | { | |
6c400b59 PA |
3205 | if (!interpreter_async) |
3206 | { | |
3207 | /* We're not going back to the top level event loop yet. Don't | |
3208 | install the readline callback, as it'd prep the terminal, | |
3209 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3210 | it the next time the prompt is displayed, when we're ready | |
3211 | for input. */ | |
3212 | return; | |
3213 | } | |
3214 | ||
d3d4baed PA |
3215 | if (async_command_editing_p && !sync_execution) |
3216 | gdb_rl_callback_handler_reinstall (); | |
3217 | } | |
3218 | ||
1777feb0 | 3219 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3220 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3221 | descriptor corresponding to the target. It can be called more than |
3222 | once to complete a single execution command. In such cases we need | |
3223 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3224 | that this function is called for a single execution command, then |
3225 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3226 | necessary cleanups. */ |
43ff13b4 JM |
3227 | |
3228 | void | |
fba45db2 | 3229 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3230 | { |
0d1e5fa7 | 3231 | struct execution_control_state ecss; |
a474d7c2 | 3232 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 3233 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 3234 | struct cleanup *ts_old_chain; |
4f8d22e3 | 3235 | int was_sync = sync_execution; |
0f641c01 | 3236 | int cmd_done = 0; |
963f9c80 | 3237 | ptid_t waiton_ptid = minus_one_ptid; |
43ff13b4 | 3238 | |
0d1e5fa7 PA |
3239 | memset (ecs, 0, sizeof (*ecs)); |
3240 | ||
d3d4baed PA |
3241 | /* End up with readline processing input, if necessary. */ |
3242 | make_cleanup (reinstall_readline_callback_handler_cleanup, NULL); | |
3243 | ||
c5187ac6 PA |
3244 | /* We're handling a live event, so make sure we're doing live |
3245 | debugging. If we're looking at traceframes while the target is | |
3246 | running, we're going to need to get back to that mode after | |
3247 | handling the event. */ | |
3248 | if (non_stop) | |
3249 | { | |
3250 | make_cleanup_restore_current_traceframe (); | |
e6e4e701 | 3251 | set_current_traceframe (-1); |
c5187ac6 PA |
3252 | } |
3253 | ||
4f8d22e3 PA |
3254 | if (non_stop) |
3255 | /* In non-stop mode, the user/frontend should not notice a thread | |
3256 | switch due to internal events. Make sure we reverse to the | |
3257 | user selected thread and frame after handling the event and | |
3258 | running any breakpoint commands. */ | |
3259 | make_cleanup_restore_current_thread (); | |
3260 | ||
ec9499be | 3261 | overlay_cache_invalid = 1; |
f15cb84a YQ |
3262 | /* Flush target cache before starting to handle each event. Target |
3263 | was running and cache could be stale. This is just a heuristic. | |
3264 | Running threads may modify target memory, but we don't get any | |
3265 | event. */ | |
3266 | target_dcache_invalidate (); | |
3dd5b83d | 3267 | |
32231432 PA |
3268 | make_cleanup_restore_integer (&execution_direction); |
3269 | execution_direction = target_execution_direction (); | |
3270 | ||
9a4105ab | 3271 | if (deprecated_target_wait_hook) |
a474d7c2 | 3272 | ecs->ptid = |
47608cb1 | 3273 | deprecated_target_wait_hook (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 3274 | else |
47608cb1 | 3275 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 3276 | |
f00150c9 | 3277 | if (debug_infrun) |
223698f8 | 3278 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3279 | |
29f49a6a PA |
3280 | /* If an error happens while handling the event, propagate GDB's |
3281 | knowledge of the executing state to the frontend/user running | |
3282 | state. */ | |
3283 | if (!non_stop) | |
3284 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
3285 | else | |
3286 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
3287 | ||
353d1d73 JK |
3288 | /* Get executed before make_cleanup_restore_current_thread above to apply |
3289 | still for the thread which has thrown the exception. */ | |
3290 | make_bpstat_clear_actions_cleanup (); | |
3291 | ||
7c16b83e PA |
3292 | make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, NULL); |
3293 | ||
43ff13b4 | 3294 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 3295 | handle_inferior_event (ecs); |
43ff13b4 | 3296 | |
a474d7c2 | 3297 | if (!ecs->wait_some_more) |
43ff13b4 | 3298 | { |
c9657e70 | 3299 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
d6b48e9c | 3300 | |
0cbcdb96 | 3301 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3302 | |
d6b48e9c | 3303 | /* We may not find an inferior if this was a process exit. */ |
16c381f0 | 3304 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) |
83c265ab PA |
3305 | normal_stop (); |
3306 | ||
af679fd0 | 3307 | if (target_has_execution |
0e5bf2a8 | 3308 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED |
af679fd0 PA |
3309 | && ecs->ws.kind != TARGET_WAITKIND_EXITED |
3310 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
3311 | && ecs->event_thread->step_multi | |
16c381f0 | 3312 | && ecs->event_thread->control.stop_step) |
c2d11a7d JM |
3313 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); |
3314 | else | |
0f641c01 PA |
3315 | { |
3316 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
3317 | cmd_done = 1; | |
3318 | } | |
43ff13b4 | 3319 | } |
4f8d22e3 | 3320 | |
29f49a6a PA |
3321 | /* No error, don't finish the thread states yet. */ |
3322 | discard_cleanups (ts_old_chain); | |
3323 | ||
4f8d22e3 PA |
3324 | /* Revert thread and frame. */ |
3325 | do_cleanups (old_chain); | |
3326 | ||
3327 | /* If the inferior was in sync execution mode, and now isn't, | |
0f641c01 PA |
3328 | restore the prompt (a synchronous execution command has finished, |
3329 | and we're ready for input). */ | |
b4a14fd0 | 3330 | if (interpreter_async && was_sync && !sync_execution) |
92bcb5f9 | 3331 | observer_notify_sync_execution_done (); |
0f641c01 PA |
3332 | |
3333 | if (cmd_done | |
3334 | && !was_sync | |
3335 | && exec_done_display_p | |
3336 | && (ptid_equal (inferior_ptid, null_ptid) | |
3337 | || !is_running (inferior_ptid))) | |
3338 | printf_unfiltered (_("completed.\n")); | |
43ff13b4 JM |
3339 | } |
3340 | ||
edb3359d DJ |
3341 | /* Record the frame and location we're currently stepping through. */ |
3342 | void | |
3343 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
3344 | { | |
3345 | struct thread_info *tp = inferior_thread (); | |
3346 | ||
16c381f0 JK |
3347 | tp->control.step_frame_id = get_frame_id (frame); |
3348 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
3349 | |
3350 | tp->current_symtab = sal.symtab; | |
3351 | tp->current_line = sal.line; | |
3352 | } | |
3353 | ||
0d1e5fa7 PA |
3354 | /* Clear context switchable stepping state. */ |
3355 | ||
3356 | void | |
4e1c45ea | 3357 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 3358 | { |
7f5ef605 | 3359 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 3360 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 3361 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 3362 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
3363 | } |
3364 | ||
c32c64b7 DE |
3365 | /* Set the cached copy of the last ptid/waitstatus. */ |
3366 | ||
3367 | static void | |
3368 | set_last_target_status (ptid_t ptid, struct target_waitstatus status) | |
3369 | { | |
3370 | target_last_wait_ptid = ptid; | |
3371 | target_last_waitstatus = status; | |
3372 | } | |
3373 | ||
e02bc4cc | 3374 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
3375 | target_wait()/deprecated_target_wait_hook(). The data is actually |
3376 | cached by handle_inferior_event(), which gets called immediately | |
3377 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
3378 | |
3379 | void | |
488f131b | 3380 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 3381 | { |
39f77062 | 3382 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
3383 | *status = target_last_waitstatus; |
3384 | } | |
3385 | ||
ac264b3b MS |
3386 | void |
3387 | nullify_last_target_wait_ptid (void) | |
3388 | { | |
3389 | target_last_wait_ptid = minus_one_ptid; | |
3390 | } | |
3391 | ||
dcf4fbde | 3392 | /* Switch thread contexts. */ |
dd80620e MS |
3393 | |
3394 | static void | |
0d1e5fa7 | 3395 | context_switch (ptid_t ptid) |
dd80620e | 3396 | { |
4b51d87b | 3397 | if (debug_infrun && !ptid_equal (ptid, inferior_ptid)) |
fd48f117 DJ |
3398 | { |
3399 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
3400 | target_pid_to_str (inferior_ptid)); | |
3401 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 3402 | target_pid_to_str (ptid)); |
fd48f117 DJ |
3403 | } |
3404 | ||
0d1e5fa7 | 3405 | switch_to_thread (ptid); |
dd80620e MS |
3406 | } |
3407 | ||
4fa8626c DJ |
3408 | static void |
3409 | adjust_pc_after_break (struct execution_control_state *ecs) | |
3410 | { | |
24a73cce UW |
3411 | struct regcache *regcache; |
3412 | struct gdbarch *gdbarch; | |
6c95b8df | 3413 | struct address_space *aspace; |
118e6252 | 3414 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 3415 | |
4fa8626c DJ |
3416 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
3417 | we aren't, just return. | |
9709f61c DJ |
3418 | |
3419 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
3420 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
3421 | implemented by software breakpoints should be handled through the normal | |
3422 | breakpoint layer. | |
8fb3e588 | 3423 | |
4fa8626c DJ |
3424 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
3425 | different signals (SIGILL or SIGEMT for instance), but it is less | |
3426 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
3427 | gdbarch_decr_pc_after_break. I don't know any specific target that |
3428 | generates these signals at breakpoints (the code has been in GDB since at | |
3429 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 3430 | |
e6cf7916 UW |
3431 | In earlier versions of GDB, a target with |
3432 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
3433 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
3434 | target with both of these set in GDB history, and it seems unlikely to be | |
3435 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c DJ |
3436 | |
3437 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
3438 | return; | |
3439 | ||
a493e3e2 | 3440 | if (ecs->ws.value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
3441 | return; |
3442 | ||
4058b839 PA |
3443 | /* In reverse execution, when a breakpoint is hit, the instruction |
3444 | under it has already been de-executed. The reported PC always | |
3445 | points at the breakpoint address, so adjusting it further would | |
3446 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
3447 | architecture: | |
3448 | ||
3449 | B1 0x08000000 : INSN1 | |
3450 | B2 0x08000001 : INSN2 | |
3451 | 0x08000002 : INSN3 | |
3452 | PC -> 0x08000003 : INSN4 | |
3453 | ||
3454 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
3455 | from that point should hit B2 as below. Reading the PC when the | |
3456 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
3457 | been de-executed already. | |
3458 | ||
3459 | B1 0x08000000 : INSN1 | |
3460 | B2 PC -> 0x08000001 : INSN2 | |
3461 | 0x08000002 : INSN3 | |
3462 | 0x08000003 : INSN4 | |
3463 | ||
3464 | We can't apply the same logic as for forward execution, because | |
3465 | we would wrongly adjust the PC to 0x08000000, since there's a | |
3466 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
3467 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
3468 | behaviour. */ | |
3469 | if (execution_direction == EXEC_REVERSE) | |
3470 | return; | |
3471 | ||
1cf4d951 PA |
3472 | /* If the target can tell whether the thread hit a SW breakpoint, |
3473 | trust it. Targets that can tell also adjust the PC | |
3474 | themselves. */ | |
3475 | if (target_supports_stopped_by_sw_breakpoint ()) | |
3476 | return; | |
3477 | ||
3478 | /* Note that relying on whether a breakpoint is planted in memory to | |
3479 | determine this can fail. E.g,. the breakpoint could have been | |
3480 | removed since. Or the thread could have been told to step an | |
3481 | instruction the size of a breakpoint instruction, and only | |
3482 | _after_ was a breakpoint inserted at its address. */ | |
3483 | ||
24a73cce UW |
3484 | /* If this target does not decrement the PC after breakpoints, then |
3485 | we have nothing to do. */ | |
3486 | regcache = get_thread_regcache (ecs->ptid); | |
3487 | gdbarch = get_regcache_arch (regcache); | |
118e6252 | 3488 | |
527a273a | 3489 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 3490 | if (decr_pc == 0) |
24a73cce UW |
3491 | return; |
3492 | ||
6c95b8df PA |
3493 | aspace = get_regcache_aspace (regcache); |
3494 | ||
8aad930b AC |
3495 | /* Find the location where (if we've hit a breakpoint) the |
3496 | breakpoint would be. */ | |
118e6252 | 3497 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 3498 | |
1cf4d951 PA |
3499 | /* If the target can't tell whether a software breakpoint triggered, |
3500 | fallback to figuring it out based on breakpoints we think were | |
3501 | inserted in the target, and on whether the thread was stepped or | |
3502 | continued. */ | |
3503 | ||
1c5cfe86 PA |
3504 | /* Check whether there actually is a software breakpoint inserted at |
3505 | that location. | |
3506 | ||
3507 | If in non-stop mode, a race condition is possible where we've | |
3508 | removed a breakpoint, but stop events for that breakpoint were | |
3509 | already queued and arrive later. To suppress those spurious | |
3510 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
3511 | and retire them after a number of stop events are reported. Note |
3512 | this is an heuristic and can thus get confused. The real fix is | |
3513 | to get the "stopped by SW BP and needs adjustment" info out of | |
3514 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df PA |
3515 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
3516 | || (non_stop && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 3517 | { |
77f9e713 | 3518 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); |
abbb1732 | 3519 | |
8213266a | 3520 | if (record_full_is_used ()) |
77f9e713 | 3521 | record_full_gdb_operation_disable_set (); |
96429cc8 | 3522 | |
1c0fdd0e UW |
3523 | /* When using hardware single-step, a SIGTRAP is reported for both |
3524 | a completed single-step and a software breakpoint. Need to | |
3525 | differentiate between the two, as the latter needs adjusting | |
3526 | but the former does not. | |
3527 | ||
3528 | The SIGTRAP can be due to a completed hardware single-step only if | |
3529 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
3530 | - this thread is currently being stepped |
3531 | ||
3532 | If any of these events did not occur, we must have stopped due | |
3533 | to hitting a software breakpoint, and have to back up to the | |
3534 | breakpoint address. | |
3535 | ||
3536 | As a special case, we could have hardware single-stepped a | |
3537 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
3538 | we also need to back up to the breakpoint address. */ | |
3539 | ||
34b7e8a6 | 3540 | if (thread_has_single_step_breakpoints_set (ecs->event_thread) |
4e1c45ea | 3541 | || !currently_stepping (ecs->event_thread) |
7f5ef605 PA |
3542 | || (ecs->event_thread->stepped_breakpoint |
3543 | && ecs->event_thread->prev_pc == breakpoint_pc)) | |
515630c5 | 3544 | regcache_write_pc (regcache, breakpoint_pc); |
96429cc8 | 3545 | |
77f9e713 | 3546 | do_cleanups (old_cleanups); |
8aad930b | 3547 | } |
4fa8626c DJ |
3548 | } |
3549 | ||
edb3359d DJ |
3550 | static int |
3551 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
3552 | { | |
3553 | for (frame = get_prev_frame (frame); | |
3554 | frame != NULL; | |
3555 | frame = get_prev_frame (frame)) | |
3556 | { | |
3557 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
3558 | return 1; | |
3559 | if (get_frame_type (frame) != INLINE_FRAME) | |
3560 | break; | |
3561 | } | |
3562 | ||
3563 | return 0; | |
3564 | } | |
3565 | ||
a96d9b2e SDJ |
3566 | /* Auxiliary function that handles syscall entry/return events. |
3567 | It returns 1 if the inferior should keep going (and GDB | |
3568 | should ignore the event), or 0 if the event deserves to be | |
3569 | processed. */ | |
ca2163eb | 3570 | |
a96d9b2e | 3571 | static int |
ca2163eb | 3572 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 3573 | { |
ca2163eb | 3574 | struct regcache *regcache; |
ca2163eb PA |
3575 | int syscall_number; |
3576 | ||
3577 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3578 | context_switch (ecs->ptid); | |
3579 | ||
3580 | regcache = get_thread_regcache (ecs->ptid); | |
f90263c1 | 3581 | syscall_number = ecs->ws.value.syscall_number; |
ca2163eb PA |
3582 | stop_pc = regcache_read_pc (regcache); |
3583 | ||
a96d9b2e SDJ |
3584 | if (catch_syscall_enabled () > 0 |
3585 | && catching_syscall_number (syscall_number) > 0) | |
3586 | { | |
3587 | if (debug_infrun) | |
3588 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
3589 | syscall_number); | |
a96d9b2e | 3590 | |
16c381f0 | 3591 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 3592 | = bpstat_stop_status (get_regcache_aspace (regcache), |
09ac7c10 | 3593 | stop_pc, ecs->ptid, &ecs->ws); |
ab04a2af | 3594 | |
ce12b012 | 3595 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
3596 | { |
3597 | /* Catchpoint hit. */ | |
ca2163eb PA |
3598 | return 0; |
3599 | } | |
a96d9b2e | 3600 | } |
ca2163eb PA |
3601 | |
3602 | /* If no catchpoint triggered for this, then keep going. */ | |
ca2163eb PA |
3603 | keep_going (ecs); |
3604 | return 1; | |
a96d9b2e SDJ |
3605 | } |
3606 | ||
7e324e48 GB |
3607 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
3608 | ||
3609 | static void | |
3610 | fill_in_stop_func (struct gdbarch *gdbarch, | |
3611 | struct execution_control_state *ecs) | |
3612 | { | |
3613 | if (!ecs->stop_func_filled_in) | |
3614 | { | |
3615 | /* Don't care about return value; stop_func_start and stop_func_name | |
3616 | will both be 0 if it doesn't work. */ | |
3617 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
3618 | &ecs->stop_func_start, &ecs->stop_func_end); | |
3619 | ecs->stop_func_start | |
3620 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
3621 | ||
591a12a1 UW |
3622 | if (gdbarch_skip_entrypoint_p (gdbarch)) |
3623 | ecs->stop_func_start = gdbarch_skip_entrypoint (gdbarch, | |
3624 | ecs->stop_func_start); | |
3625 | ||
7e324e48 GB |
3626 | ecs->stop_func_filled_in = 1; |
3627 | } | |
3628 | } | |
3629 | ||
4f5d7f63 PA |
3630 | |
3631 | /* Return the STOP_SOON field of the inferior pointed at by PTID. */ | |
3632 | ||
3633 | static enum stop_kind | |
3634 | get_inferior_stop_soon (ptid_t ptid) | |
3635 | { | |
c9657e70 | 3636 | struct inferior *inf = find_inferior_ptid (ptid); |
4f5d7f63 PA |
3637 | |
3638 | gdb_assert (inf != NULL); | |
3639 | return inf->control.stop_soon; | |
3640 | } | |
3641 | ||
05ba8510 PA |
3642 | /* Given an execution control state that has been freshly filled in by |
3643 | an event from the inferior, figure out what it means and take | |
3644 | appropriate action. | |
3645 | ||
3646 | The alternatives are: | |
3647 | ||
22bcd14b | 3648 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
3649 | debugger. |
3650 | ||
3651 | 2) keep_going and return; to wait for the next event (set | |
3652 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
3653 | once). */ | |
c906108c | 3654 | |
ec9499be | 3655 | static void |
96baa820 | 3656 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 3657 | { |
d6b48e9c PA |
3658 | enum stop_kind stop_soon; |
3659 | ||
28736962 PA |
3660 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
3661 | { | |
3662 | /* We had an event in the inferior, but we are not interested in | |
3663 | handling it at this level. The lower layers have already | |
3664 | done what needs to be done, if anything. | |
3665 | ||
3666 | One of the possible circumstances for this is when the | |
3667 | inferior produces output for the console. The inferior has | |
3668 | not stopped, and we are ignoring the event. Another possible | |
3669 | circumstance is any event which the lower level knows will be | |
3670 | reported multiple times without an intervening resume. */ | |
3671 | if (debug_infrun) | |
3672 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
3673 | prepare_to_wait (ecs); | |
3674 | return; | |
3675 | } | |
3676 | ||
0e5bf2a8 PA |
3677 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
3678 | && target_can_async_p () && !sync_execution) | |
3679 | { | |
3680 | /* There were no unwaited-for children left in the target, but, | |
3681 | we're not synchronously waiting for events either. Just | |
3682 | ignore. Otherwise, if we were running a synchronous | |
3683 | execution command, we need to cancel it and give the user | |
3684 | back the terminal. */ | |
3685 | if (debug_infrun) | |
3686 | fprintf_unfiltered (gdb_stdlog, | |
3687 | "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n"); | |
3688 | prepare_to_wait (ecs); | |
3689 | return; | |
3690 | } | |
3691 | ||
1777feb0 | 3692 | /* Cache the last pid/waitstatus. */ |
c32c64b7 | 3693 | set_last_target_status (ecs->ptid, ecs->ws); |
e02bc4cc | 3694 | |
ca005067 | 3695 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 3696 | stop_stack_dummy = STOP_NONE; |
ca005067 | 3697 | |
0e5bf2a8 PA |
3698 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
3699 | { | |
3700 | /* No unwaited-for children left. IOW, all resumed children | |
3701 | have exited. */ | |
3702 | if (debug_infrun) | |
3703 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
3704 | ||
3705 | stop_print_frame = 0; | |
22bcd14b | 3706 | stop_waiting (ecs); |
0e5bf2a8 PA |
3707 | return; |
3708 | } | |
3709 | ||
8c90c137 | 3710 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 3711 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 PA |
3712 | { |
3713 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
3714 | /* If it's a new thread, add it to the thread database. */ | |
3715 | if (ecs->event_thread == NULL) | |
3716 | ecs->event_thread = add_thread (ecs->ptid); | |
c1e36e3e PA |
3717 | |
3718 | /* Disable range stepping. If the next step request could use a | |
3719 | range, this will be end up re-enabled then. */ | |
3720 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 3721 | } |
88ed393a JK |
3722 | |
3723 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
3724 | adjust_pc_after_break (ecs); | |
3725 | ||
3726 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
3727 | reinit_frame_cache (); | |
3728 | ||
28736962 PA |
3729 | breakpoint_retire_moribund (); |
3730 | ||
2b009048 DJ |
3731 | /* First, distinguish signals caused by the debugger from signals |
3732 | that have to do with the program's own actions. Note that | |
3733 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
3734 | on the operating system version. Here we detect when a SIGILL or | |
3735 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
3736 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
3737 | when we're trying to execute a breakpoint instruction on a | |
3738 | non-executable stack. This happens for call dummy breakpoints | |
3739 | for architectures like SPARC that place call dummies on the | |
3740 | stack. */ | |
2b009048 | 3741 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
3742 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
3743 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
3744 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 3745 | { |
de0a0249 UW |
3746 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
3747 | ||
3748 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
3749 | regcache_read_pc (regcache))) | |
3750 | { | |
3751 | if (debug_infrun) | |
3752 | fprintf_unfiltered (gdb_stdlog, | |
3753 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 3754 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 3755 | } |
2b009048 DJ |
3756 | } |
3757 | ||
28736962 PA |
3758 | /* Mark the non-executing threads accordingly. In all-stop, all |
3759 | threads of all processes are stopped when we get any event | |
3760 | reported. In non-stop mode, only the event thread stops. If | |
3761 | we're handling a process exit in non-stop mode, there's nothing | |
3762 | to do, as threads of the dead process are gone, and threads of | |
3763 | any other process were left running. */ | |
3764 | if (!non_stop) | |
3765 | set_executing (minus_one_ptid, 0); | |
3766 | else if (ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
3767 | && ecs->ws.kind != TARGET_WAITKIND_EXITED) | |
7aee8dc2 | 3768 | set_executing (ecs->ptid, 0); |
8c90c137 | 3769 | |
488f131b JB |
3770 | switch (ecs->ws.kind) |
3771 | { | |
3772 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 3773 | if (debug_infrun) |
8a9de0e4 | 3774 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
5c09a2c5 PA |
3775 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3776 | context_switch (ecs->ptid); | |
b0f4b84b DJ |
3777 | /* Ignore gracefully during startup of the inferior, as it might |
3778 | be the shell which has just loaded some objects, otherwise | |
3779 | add the symbols for the newly loaded objects. Also ignore at | |
3780 | the beginning of an attach or remote session; we will query | |
3781 | the full list of libraries once the connection is | |
3782 | established. */ | |
4f5d7f63 PA |
3783 | |
3784 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
c0236d92 | 3785 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 3786 | { |
edcc5120 TT |
3787 | struct regcache *regcache; |
3788 | ||
edcc5120 TT |
3789 | regcache = get_thread_regcache (ecs->ptid); |
3790 | ||
3791 | handle_solib_event (); | |
3792 | ||
3793 | ecs->event_thread->control.stop_bpstat | |
3794 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
3795 | stop_pc, ecs->ptid, &ecs->ws); | |
ab04a2af | 3796 | |
ce12b012 | 3797 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
3798 | { |
3799 | /* A catchpoint triggered. */ | |
94c57d6a PA |
3800 | process_event_stop_test (ecs); |
3801 | return; | |
edcc5120 | 3802 | } |
488f131b | 3803 | |
b0f4b84b DJ |
3804 | /* If requested, stop when the dynamic linker notifies |
3805 | gdb of events. This allows the user to get control | |
3806 | and place breakpoints in initializer routines for | |
3807 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 3808 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
3809 | if (stop_on_solib_events) |
3810 | { | |
55409f9d DJ |
3811 | /* Make sure we print "Stopped due to solib-event" in |
3812 | normal_stop. */ | |
3813 | stop_print_frame = 1; | |
3814 | ||
22bcd14b | 3815 | stop_waiting (ecs); |
b0f4b84b DJ |
3816 | return; |
3817 | } | |
488f131b | 3818 | } |
b0f4b84b DJ |
3819 | |
3820 | /* If we are skipping through a shell, or through shared library | |
3821 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 3822 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
3823 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
3824 | { | |
74960c60 VP |
3825 | /* Loading of shared libraries might have changed breakpoint |
3826 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 3827 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 3828 | insert_breakpoints (); |
64ce06e4 | 3829 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
3830 | prepare_to_wait (ecs); |
3831 | return; | |
3832 | } | |
3833 | ||
5c09a2c5 PA |
3834 | /* But stop if we're attaching or setting up a remote |
3835 | connection. */ | |
3836 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
3837 | || stop_soon == STOP_QUIETLY_REMOTE) | |
3838 | { | |
3839 | if (debug_infrun) | |
3840 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 3841 | stop_waiting (ecs); |
5c09a2c5 PA |
3842 | return; |
3843 | } | |
3844 | ||
3845 | internal_error (__FILE__, __LINE__, | |
3846 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 3847 | |
488f131b | 3848 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 3849 | if (debug_infrun) |
8a9de0e4 | 3850 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
64776a0b | 3851 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
8b3ee56d | 3852 | context_switch (ecs->ptid); |
64ce06e4 | 3853 | resume (GDB_SIGNAL_0); |
488f131b JB |
3854 | prepare_to_wait (ecs); |
3855 | return; | |
c5aa993b | 3856 | |
488f131b | 3857 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 3858 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 3859 | if (debug_infrun) |
940c3c06 PA |
3860 | { |
3861 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
3862 | fprintf_unfiltered (gdb_stdlog, | |
3863 | "infrun: TARGET_WAITKIND_EXITED\n"); | |
3864 | else | |
3865 | fprintf_unfiltered (gdb_stdlog, | |
3866 | "infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
3867 | } | |
3868 | ||
fb66883a | 3869 | inferior_ptid = ecs->ptid; |
c9657e70 | 3870 | set_current_inferior (find_inferior_ptid (ecs->ptid)); |
6c95b8df PA |
3871 | set_current_program_space (current_inferior ()->pspace); |
3872 | handle_vfork_child_exec_or_exit (0); | |
1777feb0 | 3873 | target_terminal_ours (); /* Must do this before mourn anyway. */ |
488f131b | 3874 | |
0c557179 SDJ |
3875 | /* Clearing any previous state of convenience variables. */ |
3876 | clear_exit_convenience_vars (); | |
3877 | ||
940c3c06 PA |
3878 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
3879 | { | |
3880 | /* Record the exit code in the convenience variable $_exitcode, so | |
3881 | that the user can inspect this again later. */ | |
3882 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
3883 | (LONGEST) ecs->ws.value.integer); | |
3884 | ||
3885 | /* Also record this in the inferior itself. */ | |
3886 | current_inferior ()->has_exit_code = 1; | |
3887 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 3888 | |
98eb56a4 PA |
3889 | /* Support the --return-child-result option. */ |
3890 | return_child_result_value = ecs->ws.value.integer; | |
3891 | ||
fd664c91 | 3892 | observer_notify_exited (ecs->ws.value.integer); |
940c3c06 PA |
3893 | } |
3894 | else | |
0c557179 SDJ |
3895 | { |
3896 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
3897 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3898 | ||
3899 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
3900 | { | |
3901 | /* Set the value of the internal variable $_exitsignal, | |
3902 | which holds the signal uncaught by the inferior. */ | |
3903 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
3904 | gdbarch_gdb_signal_to_target (gdbarch, | |
3905 | ecs->ws.value.sig)); | |
3906 | } | |
3907 | else | |
3908 | { | |
3909 | /* We don't have access to the target's method used for | |
3910 | converting between signal numbers (GDB's internal | |
3911 | representation <-> target's representation). | |
3912 | Therefore, we cannot do a good job at displaying this | |
3913 | information to the user. It's better to just warn | |
3914 | her about it (if infrun debugging is enabled), and | |
3915 | give up. */ | |
3916 | if (debug_infrun) | |
3917 | fprintf_filtered (gdb_stdlog, _("\ | |
3918 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
3919 | } | |
3920 | ||
fd664c91 | 3921 | observer_notify_signal_exited (ecs->ws.value.sig); |
0c557179 | 3922 | } |
8cf64490 | 3923 | |
488f131b JB |
3924 | gdb_flush (gdb_stdout); |
3925 | target_mourn_inferior (); | |
488f131b | 3926 | stop_print_frame = 0; |
22bcd14b | 3927 | stop_waiting (ecs); |
488f131b | 3928 | return; |
c5aa993b | 3929 | |
488f131b | 3930 | /* The following are the only cases in which we keep going; |
1777feb0 | 3931 | the above cases end in a continue or goto. */ |
488f131b | 3932 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 3933 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 3934 | if (debug_infrun) |
fed708ed PA |
3935 | { |
3936 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
3937 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); | |
3938 | else | |
3939 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n"); | |
3940 | } | |
c906108c | 3941 | |
e2d96639 YQ |
3942 | /* Check whether the inferior is displaced stepping. */ |
3943 | { | |
3944 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
3945 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3946 | struct displaced_step_inferior_state *displaced | |
3947 | = get_displaced_stepping_state (ptid_get_pid (ecs->ptid)); | |
3948 | ||
3949 | /* If checking displaced stepping is supported, and thread | |
3950 | ecs->ptid is displaced stepping. */ | |
3951 | if (displaced && ptid_equal (displaced->step_ptid, ecs->ptid)) | |
3952 | { | |
3953 | struct inferior *parent_inf | |
c9657e70 | 3954 | = find_inferior_ptid (ecs->ptid); |
e2d96639 YQ |
3955 | struct regcache *child_regcache; |
3956 | CORE_ADDR parent_pc; | |
3957 | ||
3958 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
3959 | indicating that the displaced stepping of syscall instruction | |
3960 | has been done. Perform cleanup for parent process here. Note | |
3961 | that this operation also cleans up the child process for vfork, | |
3962 | because their pages are shared. */ | |
a493e3e2 | 3963 | displaced_step_fixup (ecs->ptid, GDB_SIGNAL_TRAP); |
e2d96639 YQ |
3964 | |
3965 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
3966 | { | |
3967 | /* Restore scratch pad for child process. */ | |
3968 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
3969 | } | |
3970 | ||
3971 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
3972 | the child's PC is also within the scratchpad. Set the child's PC | |
3973 | to the parent's PC value, which has already been fixed up. | |
3974 | FIXME: we use the parent's aspace here, although we're touching | |
3975 | the child, because the child hasn't been added to the inferior | |
3976 | list yet at this point. */ | |
3977 | ||
3978 | child_regcache | |
3979 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
3980 | gdbarch, | |
3981 | parent_inf->aspace); | |
3982 | /* Read PC value of parent process. */ | |
3983 | parent_pc = regcache_read_pc (regcache); | |
3984 | ||
3985 | if (debug_displaced) | |
3986 | fprintf_unfiltered (gdb_stdlog, | |
3987 | "displaced: write child pc from %s to %s\n", | |
3988 | paddress (gdbarch, | |
3989 | regcache_read_pc (child_regcache)), | |
3990 | paddress (gdbarch, parent_pc)); | |
3991 | ||
3992 | regcache_write_pc (child_regcache, parent_pc); | |
3993 | } | |
3994 | } | |
3995 | ||
5a2901d9 | 3996 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 3997 | context_switch (ecs->ptid); |
5a2901d9 | 3998 | |
b242c3c2 PA |
3999 | /* Immediately detach breakpoints from the child before there's |
4000 | any chance of letting the user delete breakpoints from the | |
4001 | breakpoint lists. If we don't do this early, it's easy to | |
4002 | leave left over traps in the child, vis: "break foo; catch | |
4003 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
4004 | the fork on the last `continue', and by that time the | |
4005 | breakpoint at "foo" is long gone from the breakpoint table. | |
4006 | If we vforked, then we don't need to unpatch here, since both | |
4007 | parent and child are sharing the same memory pages; we'll | |
4008 | need to unpatch at follow/detach time instead to be certain | |
4009 | that new breakpoints added between catchpoint hit time and | |
4010 | vfork follow are detached. */ | |
4011 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
4012 | { | |
b242c3c2 PA |
4013 | /* This won't actually modify the breakpoint list, but will |
4014 | physically remove the breakpoints from the child. */ | |
d80ee84f | 4015 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
4016 | } |
4017 | ||
34b7e8a6 | 4018 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 4019 | |
e58b0e63 PA |
4020 | /* In case the event is caught by a catchpoint, remember that |
4021 | the event is to be followed at the next resume of the thread, | |
4022 | and not immediately. */ | |
4023 | ecs->event_thread->pending_follow = ecs->ws; | |
4024 | ||
fb14de7b | 4025 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 4026 | |
16c381f0 | 4027 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4028 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 4029 | stop_pc, ecs->ptid, &ecs->ws); |
675bf4cb | 4030 | |
ce12b012 PA |
4031 | /* If no catchpoint triggered for this, then keep going. Note |
4032 | that we're interested in knowing the bpstat actually causes a | |
4033 | stop, not just if it may explain the signal. Software | |
4034 | watchpoints, for example, always appear in the bpstat. */ | |
4035 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 4036 | { |
6c95b8df PA |
4037 | ptid_t parent; |
4038 | ptid_t child; | |
e58b0e63 | 4039 | int should_resume; |
3e43a32a MS |
4040 | int follow_child |
4041 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 4042 | |
a493e3e2 | 4043 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 PA |
4044 | |
4045 | should_resume = follow_fork (); | |
4046 | ||
6c95b8df PA |
4047 | parent = ecs->ptid; |
4048 | child = ecs->ws.value.related_pid; | |
4049 | ||
4050 | /* In non-stop mode, also resume the other branch. */ | |
4051 | if (non_stop && !detach_fork) | |
4052 | { | |
4053 | if (follow_child) | |
4054 | switch_to_thread (parent); | |
4055 | else | |
4056 | switch_to_thread (child); | |
4057 | ||
4058 | ecs->event_thread = inferior_thread (); | |
4059 | ecs->ptid = inferior_ptid; | |
4060 | keep_going (ecs); | |
4061 | } | |
4062 | ||
4063 | if (follow_child) | |
4064 | switch_to_thread (child); | |
4065 | else | |
4066 | switch_to_thread (parent); | |
4067 | ||
e58b0e63 PA |
4068 | ecs->event_thread = inferior_thread (); |
4069 | ecs->ptid = inferior_ptid; | |
4070 | ||
4071 | if (should_resume) | |
4072 | keep_going (ecs); | |
4073 | else | |
22bcd14b | 4074 | stop_waiting (ecs); |
04e68871 DJ |
4075 | return; |
4076 | } | |
94c57d6a PA |
4077 | process_event_stop_test (ecs); |
4078 | return; | |
488f131b | 4079 | |
6c95b8df PA |
4080 | case TARGET_WAITKIND_VFORK_DONE: |
4081 | /* Done with the shared memory region. Re-insert breakpoints in | |
4082 | the parent, and keep going. */ | |
4083 | ||
4084 | if (debug_infrun) | |
3e43a32a MS |
4085 | fprintf_unfiltered (gdb_stdlog, |
4086 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
6c95b8df PA |
4087 | |
4088 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
4089 | context_switch (ecs->ptid); | |
4090 | ||
4091 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 4092 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
6c95b8df PA |
4093 | /* This also takes care of reinserting breakpoints in the |
4094 | previously locked inferior. */ | |
4095 | keep_going (ecs); | |
4096 | return; | |
4097 | ||
488f131b | 4098 | case TARGET_WAITKIND_EXECD: |
527159b7 | 4099 | if (debug_infrun) |
fc5261f2 | 4100 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 4101 | |
5a2901d9 | 4102 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 4103 | context_switch (ecs->ptid); |
5a2901d9 | 4104 | |
fb14de7b | 4105 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
795e548f | 4106 | |
6c95b8df PA |
4107 | /* Do whatever is necessary to the parent branch of the vfork. */ |
4108 | handle_vfork_child_exec_or_exit (1); | |
4109 | ||
795e548f PA |
4110 | /* This causes the eventpoints and symbol table to be reset. |
4111 | Must do this now, before trying to determine whether to | |
4112 | stop. */ | |
71b43ef8 | 4113 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 4114 | |
16c381f0 | 4115 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4116 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 4117 | stop_pc, ecs->ptid, &ecs->ws); |
795e548f | 4118 | |
71b43ef8 PA |
4119 | /* Note that this may be referenced from inside |
4120 | bpstat_stop_status above, through inferior_has_execd. */ | |
4121 | xfree (ecs->ws.value.execd_pathname); | |
4122 | ecs->ws.value.execd_pathname = NULL; | |
4123 | ||
04e68871 | 4124 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 4125 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 4126 | { |
a493e3e2 | 4127 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
4128 | keep_going (ecs); |
4129 | return; | |
4130 | } | |
94c57d6a PA |
4131 | process_event_stop_test (ecs); |
4132 | return; | |
488f131b | 4133 | |
b4dc5ffa MK |
4134 | /* Be careful not to try to gather much state about a thread |
4135 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 4136 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 4137 | if (debug_infrun) |
3e43a32a MS |
4138 | fprintf_unfiltered (gdb_stdlog, |
4139 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
1777feb0 | 4140 | /* Getting the current syscall number. */ |
94c57d6a PA |
4141 | if (handle_syscall_event (ecs) == 0) |
4142 | process_event_stop_test (ecs); | |
4143 | return; | |
c906108c | 4144 | |
488f131b JB |
4145 | /* Before examining the threads further, step this thread to |
4146 | get it entirely out of the syscall. (We get notice of the | |
4147 | event when the thread is just on the verge of exiting a | |
4148 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 4149 | into user code.) */ |
488f131b | 4150 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 4151 | if (debug_infrun) |
3e43a32a MS |
4152 | fprintf_unfiltered (gdb_stdlog, |
4153 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
94c57d6a PA |
4154 | if (handle_syscall_event (ecs) == 0) |
4155 | process_event_stop_test (ecs); | |
4156 | return; | |
c906108c | 4157 | |
488f131b | 4158 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 4159 | if (debug_infrun) |
8a9de0e4 | 4160 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
16c381f0 | 4161 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
4f5d7f63 PA |
4162 | handle_signal_stop (ecs); |
4163 | return; | |
c906108c | 4164 | |
b2175913 | 4165 | case TARGET_WAITKIND_NO_HISTORY: |
4b4e080e PA |
4166 | if (debug_infrun) |
4167 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
b2175913 | 4168 | /* Reverse execution: target ran out of history info. */ |
eab402df | 4169 | |
34b7e8a6 | 4170 | delete_just_stopped_threads_single_step_breakpoints (); |
fb14de7b | 4171 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
fd664c91 | 4172 | observer_notify_no_history (); |
22bcd14b | 4173 | stop_waiting (ecs); |
b2175913 | 4174 | return; |
488f131b | 4175 | } |
4f5d7f63 PA |
4176 | } |
4177 | ||
4178 | /* Come here when the program has stopped with a signal. */ | |
4179 | ||
4180 | static void | |
4181 | handle_signal_stop (struct execution_control_state *ecs) | |
4182 | { | |
4183 | struct frame_info *frame; | |
4184 | struct gdbarch *gdbarch; | |
4185 | int stopped_by_watchpoint; | |
4186 | enum stop_kind stop_soon; | |
4187 | int random_signal; | |
c906108c | 4188 | |
f0407826 DE |
4189 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
4190 | ||
4191 | /* Do we need to clean up the state of a thread that has | |
4192 | completed a displaced single-step? (Doing so usually affects | |
4193 | the PC, so do it here, before we set stop_pc.) */ | |
4194 | displaced_step_fixup (ecs->ptid, | |
4195 | ecs->event_thread->suspend.stop_signal); | |
4196 | ||
4197 | /* If we either finished a single-step or hit a breakpoint, but | |
4198 | the user wanted this thread to be stopped, pretend we got a | |
4199 | SIG0 (generic unsignaled stop). */ | |
4200 | if (ecs->event_thread->stop_requested | |
4201 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
4202 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 4203 | |
515630c5 | 4204 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 4205 | |
527159b7 | 4206 | if (debug_infrun) |
237fc4c9 | 4207 | { |
5af949e3 UW |
4208 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
4209 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7f82dfc7 JK |
4210 | struct cleanup *old_chain = save_inferior_ptid (); |
4211 | ||
4212 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
4213 | |
4214 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
4215 | paddress (gdbarch, stop_pc)); | |
d92524f1 | 4216 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
4217 | { |
4218 | CORE_ADDR addr; | |
abbb1732 | 4219 | |
237fc4c9 PA |
4220 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
4221 | ||
4222 | if (target_stopped_data_address (¤t_target, &addr)) | |
4223 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
4224 | "infrun: stopped data address = %s\n", |
4225 | paddress (gdbarch, addr)); | |
237fc4c9 PA |
4226 | else |
4227 | fprintf_unfiltered (gdb_stdlog, | |
4228 | "infrun: (no data address available)\n"); | |
4229 | } | |
7f82dfc7 JK |
4230 | |
4231 | do_cleanups (old_chain); | |
237fc4c9 | 4232 | } |
527159b7 | 4233 | |
36fa8042 PA |
4234 | /* This is originated from start_remote(), start_inferior() and |
4235 | shared libraries hook functions. */ | |
4236 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
4237 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) | |
4238 | { | |
4239 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
4240 | context_switch (ecs->ptid); | |
4241 | if (debug_infrun) | |
4242 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
4243 | stop_print_frame = 1; | |
22bcd14b | 4244 | stop_waiting (ecs); |
36fa8042 PA |
4245 | return; |
4246 | } | |
4247 | ||
4248 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
4249 | && stop_after_trap) | |
4250 | { | |
4251 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
4252 | context_switch (ecs->ptid); | |
4253 | if (debug_infrun) | |
4254 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
4255 | stop_print_frame = 0; | |
22bcd14b | 4256 | stop_waiting (ecs); |
36fa8042 PA |
4257 | return; |
4258 | } | |
4259 | ||
4260 | /* This originates from attach_command(). We need to overwrite | |
4261 | the stop_signal here, because some kernels don't ignore a | |
4262 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
4263 | See more comments in inferior.h. On the other hand, if we | |
4264 | get a non-SIGSTOP, report it to the user - assume the backend | |
4265 | will handle the SIGSTOP if it should show up later. | |
4266 | ||
4267 | Also consider that the attach is complete when we see a | |
4268 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
4269 | target extended-remote report it instead of a SIGSTOP | |
4270 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
4271 | signal, so this is no exception. | |
4272 | ||
4273 | Also consider that the attach is complete when we see a | |
4274 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
4275 | the target to stop all threads of the inferior, in case the | |
4276 | low level attach operation doesn't stop them implicitly. If | |
4277 | they weren't stopped implicitly, then the stub will report a | |
4278 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
4279 | other than GDB's request. */ | |
4280 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
4281 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
4282 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
4283 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
4284 | { | |
4285 | stop_print_frame = 1; | |
22bcd14b | 4286 | stop_waiting (ecs); |
36fa8042 PA |
4287 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
4288 | return; | |
4289 | } | |
4290 | ||
488f131b | 4291 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
4292 | so, then switch to that thread. */ |
4293 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 4294 | { |
527159b7 | 4295 | if (debug_infrun) |
8a9de0e4 | 4296 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 4297 | |
0d1e5fa7 | 4298 | context_switch (ecs->ptid); |
c5aa993b | 4299 | |
9a4105ab AC |
4300 | if (deprecated_context_hook) |
4301 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 4302 | } |
c906108c | 4303 | |
568d6575 UW |
4304 | /* At this point, get hold of the now-current thread's frame. */ |
4305 | frame = get_current_frame (); | |
4306 | gdbarch = get_frame_arch (frame); | |
4307 | ||
2adfaa28 | 4308 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 4309 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 4310 | { |
af48d08f PA |
4311 | struct regcache *regcache; |
4312 | struct address_space *aspace; | |
4313 | CORE_ADDR pc; | |
2adfaa28 | 4314 | |
af48d08f PA |
4315 | regcache = get_thread_regcache (ecs->ptid); |
4316 | aspace = get_regcache_aspace (regcache); | |
4317 | pc = regcache_read_pc (regcache); | |
34b7e8a6 | 4318 | |
af48d08f PA |
4319 | /* However, before doing so, if this single-step breakpoint was |
4320 | actually for another thread, set this thread up for moving | |
4321 | past it. */ | |
4322 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
4323 | aspace, pc)) | |
4324 | { | |
4325 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
4326 | { |
4327 | if (debug_infrun) | |
4328 | { | |
4329 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 4330 | "infrun: [%s] hit another thread's " |
34b7e8a6 PA |
4331 | "single-step breakpoint\n", |
4332 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 | 4333 | } |
af48d08f PA |
4334 | ecs->hit_singlestep_breakpoint = 1; |
4335 | } | |
4336 | } | |
4337 | else | |
4338 | { | |
4339 | if (debug_infrun) | |
4340 | { | |
4341 | fprintf_unfiltered (gdb_stdlog, | |
4342 | "infrun: [%s] hit its " | |
4343 | "single-step breakpoint\n", | |
4344 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 PA |
4345 | } |
4346 | } | |
488f131b | 4347 | } |
af48d08f | 4348 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 4349 | |
963f9c80 PA |
4350 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
4351 | && ecs->event_thread->control.trap_expected | |
4352 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
4353 | stopped_by_watchpoint = 0; |
4354 | else | |
4355 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
4356 | ||
4357 | /* If necessary, step over this watchpoint. We'll be back to display | |
4358 | it in a moment. */ | |
4359 | if (stopped_by_watchpoint | |
d92524f1 | 4360 | && (target_have_steppable_watchpoint |
568d6575 | 4361 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 4362 | { |
488f131b JB |
4363 | /* At this point, we are stopped at an instruction which has |
4364 | attempted to write to a piece of memory under control of | |
4365 | a watchpoint. The instruction hasn't actually executed | |
4366 | yet. If we were to evaluate the watchpoint expression | |
4367 | now, we would get the old value, and therefore no change | |
4368 | would seem to have occurred. | |
4369 | ||
4370 | In order to make watchpoints work `right', we really need | |
4371 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
4372 | watchpoint expression. We do this by single-stepping the |
4373 | target. | |
4374 | ||
7f89fd65 | 4375 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
4376 | it. For example, the PA can (with some kernel cooperation) |
4377 | single step over a watchpoint without disabling the watchpoint. | |
4378 | ||
4379 | It is far more common to need to disable a watchpoint to step | |
4380 | the inferior over it. If we have non-steppable watchpoints, | |
4381 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
4382 | disable all watchpoints. |
4383 | ||
4384 | Any breakpoint at PC must also be stepped over -- if there's | |
4385 | one, it will have already triggered before the watchpoint | |
4386 | triggered, and we either already reported it to the user, or | |
4387 | it didn't cause a stop and we called keep_going. In either | |
4388 | case, if there was a breakpoint at PC, we must be trying to | |
4389 | step past it. */ | |
4390 | ecs->event_thread->stepping_over_watchpoint = 1; | |
4391 | keep_going (ecs); | |
488f131b JB |
4392 | return; |
4393 | } | |
4394 | ||
4e1c45ea | 4395 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 4396 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
4397 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
4398 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 4399 | stop_print_frame = 1; |
488f131b | 4400 | stopped_by_random_signal = 0; |
488f131b | 4401 | |
edb3359d DJ |
4402 | /* Hide inlined functions starting here, unless we just performed stepi or |
4403 | nexti. After stepi and nexti, always show the innermost frame (not any | |
4404 | inline function call sites). */ | |
16c381f0 | 4405 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f GB |
4406 | { |
4407 | struct address_space *aspace = | |
4408 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
4409 | ||
4410 | /* skip_inline_frames is expensive, so we avoid it if we can | |
4411 | determine that the address is one where functions cannot have | |
4412 | been inlined. This improves performance with inferiors that | |
4413 | load a lot of shared libraries, because the solib event | |
4414 | breakpoint is defined as the address of a function (i.e. not | |
4415 | inline). Note that we have to check the previous PC as well | |
4416 | as the current one to catch cases when we have just | |
4417 | single-stepped off a breakpoint prior to reinstating it. | |
4418 | Note that we're assuming that the code we single-step to is | |
4419 | not inline, but that's not definitive: there's nothing | |
4420 | preventing the event breakpoint function from containing | |
4421 | inlined code, and the single-step ending up there. If the | |
4422 | user had set a breakpoint on that inlined code, the missing | |
4423 | skip_inline_frames call would break things. Fortunately | |
4424 | that's an extremely unlikely scenario. */ | |
09ac7c10 | 4425 | if (!pc_at_non_inline_function (aspace, stop_pc, &ecs->ws) |
a210c238 MR |
4426 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
4427 | && ecs->event_thread->control.trap_expected | |
4428 | && pc_at_non_inline_function (aspace, | |
4429 | ecs->event_thread->prev_pc, | |
09ac7c10 | 4430 | &ecs->ws))) |
1c5a993e MR |
4431 | { |
4432 | skip_inline_frames (ecs->ptid); | |
4433 | ||
4434 | /* Re-fetch current thread's frame in case that invalidated | |
4435 | the frame cache. */ | |
4436 | frame = get_current_frame (); | |
4437 | gdbarch = get_frame_arch (frame); | |
4438 | } | |
0574c78f | 4439 | } |
edb3359d | 4440 | |
a493e3e2 | 4441 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 4442 | && ecs->event_thread->control.trap_expected |
568d6575 | 4443 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 4444 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 4445 | { |
b50d7442 | 4446 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 4447 | also on an instruction that needs to be stepped multiple |
1777feb0 | 4448 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
4449 | with a delay slot. It needs to be stepped twice, once for |
4450 | the instruction and once for the delay slot. */ | |
4451 | int step_through_delay | |
568d6575 | 4452 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 4453 | |
527159b7 | 4454 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 4455 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
4456 | if (ecs->event_thread->control.step_range_end == 0 |
4457 | && step_through_delay) | |
3352ef37 AC |
4458 | { |
4459 | /* The user issued a continue when stopped at a breakpoint. | |
4460 | Set up for another trap and get out of here. */ | |
4e1c45ea | 4461 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
4462 | keep_going (ecs); |
4463 | return; | |
4464 | } | |
4465 | else if (step_through_delay) | |
4466 | { | |
4467 | /* The user issued a step when stopped at a breakpoint. | |
4468 | Maybe we should stop, maybe we should not - the delay | |
4469 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
4470 | case, don't decide that here, just set |
4471 | ecs->stepping_over_breakpoint, making sure we | |
4472 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 4473 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
4474 | } |
4475 | } | |
4476 | ||
ab04a2af TT |
4477 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
4478 | handles this event. */ | |
4479 | ecs->event_thread->control.stop_bpstat | |
4480 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
4481 | stop_pc, ecs->ptid, &ecs->ws); | |
db82e815 | 4482 | |
ab04a2af TT |
4483 | /* Following in case break condition called a |
4484 | function. */ | |
4485 | stop_print_frame = 1; | |
73dd234f | 4486 | |
ab04a2af TT |
4487 | /* This is where we handle "moribund" watchpoints. Unlike |
4488 | software breakpoints traps, hardware watchpoint traps are | |
4489 | always distinguishable from random traps. If no high-level | |
4490 | watchpoint is associated with the reported stop data address | |
4491 | anymore, then the bpstat does not explain the signal --- | |
4492 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
4493 | set. */ | |
4494 | ||
4495 | if (debug_infrun | |
4496 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 4497 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 4498 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
4499 | && stopped_by_watchpoint) |
4500 | fprintf_unfiltered (gdb_stdlog, | |
4501 | "infrun: no user watchpoint explains " | |
4502 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 4503 | |
bac7d97b | 4504 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
4505 | at one stage in the past included checks for an inferior |
4506 | function call's call dummy's return breakpoint. The original | |
4507 | comment, that went with the test, read: | |
03cebad2 | 4508 | |
ab04a2af TT |
4509 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
4510 | another signal besides SIGTRAP, so check here as well as | |
4511 | above.'' | |
73dd234f | 4512 | |
ab04a2af TT |
4513 | If someone ever tries to get call dummys on a |
4514 | non-executable stack to work (where the target would stop | |
4515 | with something like a SIGSEGV), then those tests might need | |
4516 | to be re-instated. Given, however, that the tests were only | |
4517 | enabled when momentary breakpoints were not being used, I | |
4518 | suspect that it won't be the case. | |
488f131b | 4519 | |
ab04a2af TT |
4520 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
4521 | be necessary for call dummies on a non-executable stack on | |
4522 | SPARC. */ | |
488f131b | 4523 | |
bac7d97b | 4524 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
4525 | random_signal |
4526 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
4527 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 4528 | |
1cf4d951 PA |
4529 | /* Maybe this was a trap for a software breakpoint that has since |
4530 | been removed. */ | |
4531 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
4532 | { | |
4533 | if (program_breakpoint_here_p (gdbarch, stop_pc)) | |
4534 | { | |
4535 | struct regcache *regcache; | |
4536 | int decr_pc; | |
4537 | ||
4538 | /* Re-adjust PC to what the program would see if GDB was not | |
4539 | debugging it. */ | |
4540 | regcache = get_thread_regcache (ecs->event_thread->ptid); | |
527a273a | 4541 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
4542 | if (decr_pc != 0) |
4543 | { | |
4544 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); | |
4545 | ||
4546 | if (record_full_is_used ()) | |
4547 | record_full_gdb_operation_disable_set (); | |
4548 | ||
4549 | regcache_write_pc (regcache, stop_pc + decr_pc); | |
4550 | ||
4551 | do_cleanups (old_cleanups); | |
4552 | } | |
4553 | } | |
4554 | else | |
4555 | { | |
4556 | /* A delayed software breakpoint event. Ignore the trap. */ | |
4557 | if (debug_infrun) | |
4558 | fprintf_unfiltered (gdb_stdlog, | |
4559 | "infrun: delayed software breakpoint " | |
4560 | "trap, ignoring\n"); | |
4561 | random_signal = 0; | |
4562 | } | |
4563 | } | |
4564 | ||
4565 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
4566 | has since been removed. */ | |
4567 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
4568 | { | |
4569 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
4570 | if (debug_infrun) | |
4571 | fprintf_unfiltered (gdb_stdlog, | |
4572 | "infrun: delayed hardware breakpoint/watchpoint " | |
4573 | "trap, ignoring\n"); | |
4574 | random_signal = 0; | |
4575 | } | |
4576 | ||
bac7d97b PA |
4577 | /* If not, perhaps stepping/nexting can. */ |
4578 | if (random_signal) | |
4579 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
4580 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 4581 | |
2adfaa28 PA |
4582 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
4583 | thread. Single-step breakpoints are transparent to the | |
4584 | breakpoints module. */ | |
4585 | if (random_signal) | |
4586 | random_signal = !ecs->hit_singlestep_breakpoint; | |
4587 | ||
bac7d97b PA |
4588 | /* No? Perhaps we got a moribund watchpoint. */ |
4589 | if (random_signal) | |
4590 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 4591 | |
488f131b JB |
4592 | /* For the program's own signals, act according to |
4593 | the signal handling tables. */ | |
4594 | ||
ce12b012 | 4595 | if (random_signal) |
488f131b JB |
4596 | { |
4597 | /* Signal not for debugging purposes. */ | |
c9657e70 | 4598 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
c9737c08 | 4599 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 4600 | |
527159b7 | 4601 | if (debug_infrun) |
c9737c08 PA |
4602 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
4603 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 4604 | |
488f131b JB |
4605 | stopped_by_random_signal = 1; |
4606 | ||
252fbfc8 PA |
4607 | /* Always stop on signals if we're either just gaining control |
4608 | of the program, or the user explicitly requested this thread | |
4609 | to remain stopped. */ | |
d6b48e9c | 4610 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 4611 | || ecs->event_thread->stop_requested |
24291992 | 4612 | || (!inf->detaching |
16c381f0 | 4613 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 4614 | { |
22bcd14b | 4615 | stop_waiting (ecs); |
488f131b JB |
4616 | return; |
4617 | } | |
b57bacec PA |
4618 | |
4619 | /* Notify observers the signal has "handle print" set. Note we | |
4620 | returned early above if stopping; normal_stop handles the | |
4621 | printing in that case. */ | |
4622 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
4623 | { | |
4624 | /* The signal table tells us to print about this signal. */ | |
4625 | target_terminal_ours_for_output (); | |
4626 | observer_notify_signal_received (ecs->event_thread->suspend.stop_signal); | |
4627 | target_terminal_inferior (); | |
4628 | } | |
488f131b JB |
4629 | |
4630 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 4631 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 4632 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 4633 | |
fb14de7b | 4634 | if (ecs->event_thread->prev_pc == stop_pc |
16c381f0 | 4635 | && ecs->event_thread->control.trap_expected |
8358c15c | 4636 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
4637 | { |
4638 | /* We were just starting a new sequence, attempting to | |
4639 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 4640 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
4641 | of the stepping range so GDB needs to remember to, when |
4642 | the signal handler returns, resume stepping off that | |
4643 | breakpoint. */ | |
4644 | /* To simplify things, "continue" is forced to use the same | |
4645 | code paths as single-step - set a breakpoint at the | |
4646 | signal return address and then, once hit, step off that | |
4647 | breakpoint. */ | |
237fc4c9 PA |
4648 | if (debug_infrun) |
4649 | fprintf_unfiltered (gdb_stdlog, | |
4650 | "infrun: signal arrived while stepping over " | |
4651 | "breakpoint\n"); | |
d3169d93 | 4652 | |
2c03e5be | 4653 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 4654 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
4655 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
4656 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
4657 | |
4658 | /* If we were nexting/stepping some other thread, switch to | |
4659 | it, so that we don't continue it, losing control. */ | |
4660 | if (!switch_back_to_stepped_thread (ecs)) | |
4661 | keep_going (ecs); | |
9d799f85 | 4662 | return; |
68f53502 | 4663 | } |
9d799f85 | 4664 | |
e5f8a7cc PA |
4665 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
4666 | && (pc_in_thread_step_range (stop_pc, ecs->event_thread) | |
4667 | || ecs->event_thread->control.step_range_end == 1) | |
edb3359d | 4668 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 4669 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 4670 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
4671 | { |
4672 | /* The inferior is about to take a signal that will take it | |
4673 | out of the single step range. Set a breakpoint at the | |
4674 | current PC (which is presumably where the signal handler | |
4675 | will eventually return) and then allow the inferior to | |
4676 | run free. | |
4677 | ||
4678 | Note that this is only needed for a signal delivered | |
4679 | while in the single-step range. Nested signals aren't a | |
4680 | problem as they eventually all return. */ | |
237fc4c9 PA |
4681 | if (debug_infrun) |
4682 | fprintf_unfiltered (gdb_stdlog, | |
4683 | "infrun: signal may take us out of " | |
4684 | "single-step range\n"); | |
4685 | ||
2c03e5be | 4686 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 4687 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
4688 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
4689 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
4690 | keep_going (ecs); |
4691 | return; | |
d303a6c7 | 4692 | } |
9d799f85 AC |
4693 | |
4694 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
4695 | when either there's a nested signal, or when there's a | |
4696 | pending signal enabled just as the signal handler returns | |
4697 | (leaving the inferior at the step-resume-breakpoint without | |
4698 | actually executing it). Either way continue until the | |
4699 | breakpoint is really hit. */ | |
c447ac0b PA |
4700 | |
4701 | if (!switch_back_to_stepped_thread (ecs)) | |
4702 | { | |
4703 | if (debug_infrun) | |
4704 | fprintf_unfiltered (gdb_stdlog, | |
4705 | "infrun: random signal, keep going\n"); | |
4706 | ||
4707 | keep_going (ecs); | |
4708 | } | |
4709 | return; | |
488f131b | 4710 | } |
94c57d6a PA |
4711 | |
4712 | process_event_stop_test (ecs); | |
4713 | } | |
4714 | ||
4715 | /* Come here when we've got some debug event / signal we can explain | |
4716 | (IOW, not a random signal), and test whether it should cause a | |
4717 | stop, or whether we should resume the inferior (transparently). | |
4718 | E.g., could be a breakpoint whose condition evaluates false; we | |
4719 | could be still stepping within the line; etc. */ | |
4720 | ||
4721 | static void | |
4722 | process_event_stop_test (struct execution_control_state *ecs) | |
4723 | { | |
4724 | struct symtab_and_line stop_pc_sal; | |
4725 | struct frame_info *frame; | |
4726 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
4727 | CORE_ADDR jmp_buf_pc; |
4728 | struct bpstat_what what; | |
94c57d6a | 4729 | |
cdaa5b73 | 4730 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 4731 | |
cdaa5b73 PA |
4732 | frame = get_current_frame (); |
4733 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 4734 | |
cdaa5b73 | 4735 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 4736 | |
cdaa5b73 PA |
4737 | if (what.call_dummy) |
4738 | { | |
4739 | stop_stack_dummy = what.call_dummy; | |
4740 | } | |
186c406b | 4741 | |
cdaa5b73 PA |
4742 | /* If we hit an internal event that triggers symbol changes, the |
4743 | current frame will be invalidated within bpstat_what (e.g., if we | |
4744 | hit an internal solib event). Re-fetch it. */ | |
4745 | frame = get_current_frame (); | |
4746 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 4747 | |
cdaa5b73 PA |
4748 | switch (what.main_action) |
4749 | { | |
4750 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
4751 | /* If we hit the breakpoint at longjmp while stepping, we | |
4752 | install a momentary breakpoint at the target of the | |
4753 | jmp_buf. */ | |
186c406b | 4754 | |
cdaa5b73 PA |
4755 | if (debug_infrun) |
4756 | fprintf_unfiltered (gdb_stdlog, | |
4757 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 4758 | |
cdaa5b73 | 4759 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 4760 | |
cdaa5b73 PA |
4761 | if (what.is_longjmp) |
4762 | { | |
4763 | struct value *arg_value; | |
4764 | ||
4765 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
4766 | then use it to extract the arguments. The destination PC | |
4767 | is the third argument to the probe. */ | |
4768 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
4769 | if (arg_value) | |
8fa0c4f8 AA |
4770 | { |
4771 | jmp_buf_pc = value_as_address (arg_value); | |
4772 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
4773 | } | |
cdaa5b73 PA |
4774 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
4775 | || !gdbarch_get_longjmp_target (gdbarch, | |
4776 | frame, &jmp_buf_pc)) | |
e2e4d78b | 4777 | { |
cdaa5b73 PA |
4778 | if (debug_infrun) |
4779 | fprintf_unfiltered (gdb_stdlog, | |
4780 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
4781 | "(!gdbarch_get_longjmp_target)\n"); | |
4782 | keep_going (ecs); | |
4783 | return; | |
e2e4d78b | 4784 | } |
e2e4d78b | 4785 | |
cdaa5b73 PA |
4786 | /* Insert a breakpoint at resume address. */ |
4787 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
4788 | } | |
4789 | else | |
4790 | check_exception_resume (ecs, frame); | |
4791 | keep_going (ecs); | |
4792 | return; | |
e81a37f7 | 4793 | |
cdaa5b73 PA |
4794 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
4795 | { | |
4796 | struct frame_info *init_frame; | |
e81a37f7 | 4797 | |
cdaa5b73 | 4798 | /* There are several cases to consider. |
c906108c | 4799 | |
cdaa5b73 PA |
4800 | 1. The initiating frame no longer exists. In this case we |
4801 | must stop, because the exception or longjmp has gone too | |
4802 | far. | |
2c03e5be | 4803 | |
cdaa5b73 PA |
4804 | 2. The initiating frame exists, and is the same as the |
4805 | current frame. We stop, because the exception or longjmp | |
4806 | has been caught. | |
2c03e5be | 4807 | |
cdaa5b73 PA |
4808 | 3. The initiating frame exists and is different from the |
4809 | current frame. This means the exception or longjmp has | |
4810 | been caught beneath the initiating frame, so keep going. | |
c906108c | 4811 | |
cdaa5b73 PA |
4812 | 4. longjmp breakpoint has been placed just to protect |
4813 | against stale dummy frames and user is not interested in | |
4814 | stopping around longjmps. */ | |
c5aa993b | 4815 | |
cdaa5b73 PA |
4816 | if (debug_infrun) |
4817 | fprintf_unfiltered (gdb_stdlog, | |
4818 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 4819 | |
cdaa5b73 PA |
4820 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
4821 | != NULL); | |
4822 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 4823 | |
cdaa5b73 PA |
4824 | if (what.is_longjmp) |
4825 | { | |
b67a2c6f | 4826 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 4827 | |
cdaa5b73 | 4828 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 4829 | { |
cdaa5b73 PA |
4830 | /* Case 4. */ |
4831 | keep_going (ecs); | |
4832 | return; | |
e5ef252a | 4833 | } |
cdaa5b73 | 4834 | } |
c5aa993b | 4835 | |
cdaa5b73 | 4836 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 4837 | |
cdaa5b73 PA |
4838 | if (init_frame) |
4839 | { | |
4840 | struct frame_id current_id | |
4841 | = get_frame_id (get_current_frame ()); | |
4842 | if (frame_id_eq (current_id, | |
4843 | ecs->event_thread->initiating_frame)) | |
4844 | { | |
4845 | /* Case 2. Fall through. */ | |
4846 | } | |
4847 | else | |
4848 | { | |
4849 | /* Case 3. */ | |
4850 | keep_going (ecs); | |
4851 | return; | |
4852 | } | |
68f53502 | 4853 | } |
488f131b | 4854 | |
cdaa5b73 PA |
4855 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
4856 | exists. */ | |
4857 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 4858 | |
bdc36728 | 4859 | end_stepping_range (ecs); |
cdaa5b73 PA |
4860 | } |
4861 | return; | |
e5ef252a | 4862 | |
cdaa5b73 PA |
4863 | case BPSTAT_WHAT_SINGLE: |
4864 | if (debug_infrun) | |
4865 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
4866 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4867 | /* Still need to check other stuff, at least the case where we | |
4868 | are stepping and step out of the right range. */ | |
4869 | break; | |
e5ef252a | 4870 | |
cdaa5b73 PA |
4871 | case BPSTAT_WHAT_STEP_RESUME: |
4872 | if (debug_infrun) | |
4873 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 4874 | |
cdaa5b73 PA |
4875 | delete_step_resume_breakpoint (ecs->event_thread); |
4876 | if (ecs->event_thread->control.proceed_to_finish | |
4877 | && execution_direction == EXEC_REVERSE) | |
4878 | { | |
4879 | struct thread_info *tp = ecs->event_thread; | |
4880 | ||
4881 | /* We are finishing a function in reverse, and just hit the | |
4882 | step-resume breakpoint at the start address of the | |
4883 | function, and we're almost there -- just need to back up | |
4884 | by one more single-step, which should take us back to the | |
4885 | function call. */ | |
4886 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
4887 | keep_going (ecs); | |
e5ef252a | 4888 | return; |
cdaa5b73 PA |
4889 | } |
4890 | fill_in_stop_func (gdbarch, ecs); | |
4891 | if (stop_pc == ecs->stop_func_start | |
4892 | && execution_direction == EXEC_REVERSE) | |
4893 | { | |
4894 | /* We are stepping over a function call in reverse, and just | |
4895 | hit the step-resume breakpoint at the start address of | |
4896 | the function. Go back to single-stepping, which should | |
4897 | take us back to the function call. */ | |
4898 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4899 | keep_going (ecs); | |
4900 | return; | |
4901 | } | |
4902 | break; | |
e5ef252a | 4903 | |
cdaa5b73 PA |
4904 | case BPSTAT_WHAT_STOP_NOISY: |
4905 | if (debug_infrun) | |
4906 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
4907 | stop_print_frame = 1; | |
e5ef252a | 4908 | |
99619bea PA |
4909 | /* Assume the thread stopped for a breapoint. We'll still check |
4910 | whether a/the breakpoint is there when the thread is next | |
4911 | resumed. */ | |
4912 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 4913 | |
22bcd14b | 4914 | stop_waiting (ecs); |
cdaa5b73 | 4915 | return; |
e5ef252a | 4916 | |
cdaa5b73 PA |
4917 | case BPSTAT_WHAT_STOP_SILENT: |
4918 | if (debug_infrun) | |
4919 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
4920 | stop_print_frame = 0; | |
e5ef252a | 4921 | |
99619bea PA |
4922 | /* Assume the thread stopped for a breapoint. We'll still check |
4923 | whether a/the breakpoint is there when the thread is next | |
4924 | resumed. */ | |
4925 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 4926 | stop_waiting (ecs); |
cdaa5b73 PA |
4927 | return; |
4928 | ||
4929 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
4930 | if (debug_infrun) | |
4931 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
4932 | ||
4933 | delete_step_resume_breakpoint (ecs->event_thread); | |
4934 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
4935 | { | |
4936 | /* Back when the step-resume breakpoint was inserted, we | |
4937 | were trying to single-step off a breakpoint. Go back to | |
4938 | doing that. */ | |
4939 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
4940 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4941 | keep_going (ecs); | |
4942 | return; | |
e5ef252a | 4943 | } |
cdaa5b73 PA |
4944 | break; |
4945 | ||
4946 | case BPSTAT_WHAT_KEEP_CHECKING: | |
4947 | break; | |
e5ef252a | 4948 | } |
c906108c | 4949 | |
af48d08f PA |
4950 | /* If we stepped a permanent breakpoint and we had a high priority |
4951 | step-resume breakpoint for the address we stepped, but we didn't | |
4952 | hit it, then we must have stepped into the signal handler. The | |
4953 | step-resume was only necessary to catch the case of _not_ | |
4954 | stepping into the handler, so delete it, and fall through to | |
4955 | checking whether the step finished. */ | |
4956 | if (ecs->event_thread->stepped_breakpoint) | |
4957 | { | |
4958 | struct breakpoint *sr_bp | |
4959 | = ecs->event_thread->control.step_resume_breakpoint; | |
4960 | ||
4961 | if (sr_bp->loc->permanent | |
4962 | && sr_bp->type == bp_hp_step_resume | |
4963 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
4964 | { | |
4965 | if (debug_infrun) | |
4966 | fprintf_unfiltered (gdb_stdlog, | |
4967 | "infrun: stepped permanent breakpoint, stopped in " | |
4968 | "handler\n"); | |
4969 | delete_step_resume_breakpoint (ecs->event_thread); | |
4970 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
4971 | } | |
4972 | } | |
4973 | ||
cdaa5b73 PA |
4974 | /* We come here if we hit a breakpoint but should not stop for it. |
4975 | Possibly we also were stepping and should stop for that. So fall | |
4976 | through and test for stepping. But, if not stepping, do not | |
4977 | stop. */ | |
c906108c | 4978 | |
a7212384 UW |
4979 | /* In all-stop mode, if we're currently stepping but have stopped in |
4980 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
4981 | if (switch_back_to_stepped_thread (ecs)) |
4982 | return; | |
776f04fa | 4983 | |
8358c15c | 4984 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 4985 | { |
527159b7 | 4986 | if (debug_infrun) |
d3169d93 DJ |
4987 | fprintf_unfiltered (gdb_stdlog, |
4988 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 4989 | |
488f131b JB |
4990 | /* Having a step-resume breakpoint overrides anything |
4991 | else having to do with stepping commands until | |
4992 | that breakpoint is reached. */ | |
488f131b JB |
4993 | keep_going (ecs); |
4994 | return; | |
4995 | } | |
c5aa993b | 4996 | |
16c381f0 | 4997 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 4998 | { |
527159b7 | 4999 | if (debug_infrun) |
8a9de0e4 | 5000 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 5001 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
5002 | keep_going (ecs); |
5003 | return; | |
5004 | } | |
c5aa993b | 5005 | |
4b7703ad JB |
5006 | /* Re-fetch current thread's frame in case the code above caused |
5007 | the frame cache to be re-initialized, making our FRAME variable | |
5008 | a dangling pointer. */ | |
5009 | frame = get_current_frame (); | |
628fe4e4 | 5010 | gdbarch = get_frame_arch (frame); |
7e324e48 | 5011 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 5012 | |
488f131b | 5013 | /* If stepping through a line, keep going if still within it. |
c906108c | 5014 | |
488f131b JB |
5015 | Note that step_range_end is the address of the first instruction |
5016 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
5017 | within it! |
5018 | ||
5019 | Note also that during reverse execution, we may be stepping | |
5020 | through a function epilogue and therefore must detect when | |
5021 | the current-frame changes in the middle of a line. */ | |
5022 | ||
ce4c476a | 5023 | if (pc_in_thread_step_range (stop_pc, ecs->event_thread) |
31410e84 | 5024 | && (execution_direction != EXEC_REVERSE |
388a8562 | 5025 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 5026 | ecs->event_thread->control.step_frame_id))) |
488f131b | 5027 | { |
527159b7 | 5028 | if (debug_infrun) |
5af949e3 UW |
5029 | fprintf_unfiltered |
5030 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
5031 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
5032 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 5033 | |
c1e36e3e PA |
5034 | /* Tentatively re-enable range stepping; `resume' disables it if |
5035 | necessary (e.g., if we're stepping over a breakpoint or we | |
5036 | have software watchpoints). */ | |
5037 | ecs->event_thread->control.may_range_step = 1; | |
5038 | ||
b2175913 MS |
5039 | /* When stepping backward, stop at beginning of line range |
5040 | (unless it's the function entry point, in which case | |
5041 | keep going back to the call point). */ | |
16c381f0 | 5042 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
5043 | && stop_pc != ecs->stop_func_start |
5044 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 5045 | end_stepping_range (ecs); |
b2175913 MS |
5046 | else |
5047 | keep_going (ecs); | |
5048 | ||
488f131b JB |
5049 | return; |
5050 | } | |
c5aa993b | 5051 | |
488f131b | 5052 | /* We stepped out of the stepping range. */ |
c906108c | 5053 | |
488f131b | 5054 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
5055 | loader dynamic symbol resolution code... |
5056 | ||
5057 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
5058 | time loader code and reach the callee's address. | |
5059 | ||
5060 | EXEC_REVERSE: we've already executed the callee (backward), and | |
5061 | the runtime loader code is handled just like any other | |
5062 | undebuggable function call. Now we need only keep stepping | |
5063 | backward through the trampoline code, and that's handled further | |
5064 | down, so there is nothing for us to do here. */ | |
5065 | ||
5066 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 5067 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
cfd8ab24 | 5068 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 5069 | { |
4c8c40e6 | 5070 | CORE_ADDR pc_after_resolver = |
568d6575 | 5071 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); |
c906108c | 5072 | |
527159b7 | 5073 | if (debug_infrun) |
3e43a32a MS |
5074 | fprintf_unfiltered (gdb_stdlog, |
5075 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 5076 | |
488f131b JB |
5077 | if (pc_after_resolver) |
5078 | { | |
5079 | /* Set up a step-resume breakpoint at the address | |
5080 | indicated by SKIP_SOLIB_RESOLVER. */ | |
5081 | struct symtab_and_line sr_sal; | |
abbb1732 | 5082 | |
fe39c653 | 5083 | init_sal (&sr_sal); |
488f131b | 5084 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 5085 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 5086 | |
a6d9a66e UW |
5087 | insert_step_resume_breakpoint_at_sal (gdbarch, |
5088 | sr_sal, null_frame_id); | |
c5aa993b | 5089 | } |
c906108c | 5090 | |
488f131b JB |
5091 | keep_going (ecs); |
5092 | return; | |
5093 | } | |
c906108c | 5094 | |
16c381f0 JK |
5095 | if (ecs->event_thread->control.step_range_end != 1 |
5096 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
5097 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 5098 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 5099 | { |
527159b7 | 5100 | if (debug_infrun) |
3e43a32a MS |
5101 | fprintf_unfiltered (gdb_stdlog, |
5102 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 5103 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
5104 | a signal trampoline (either by a signal being delivered or by |
5105 | the signal handler returning). Just single-step until the | |
5106 | inferior leaves the trampoline (either by calling the handler | |
5107 | or returning). */ | |
488f131b JB |
5108 | keep_going (ecs); |
5109 | return; | |
5110 | } | |
c906108c | 5111 | |
14132e89 MR |
5112 | /* If we're in the return path from a shared library trampoline, |
5113 | we want to proceed through the trampoline when stepping. */ | |
5114 | /* macro/2012-04-25: This needs to come before the subroutine | |
5115 | call check below as on some targets return trampolines look | |
5116 | like subroutine calls (MIPS16 return thunks). */ | |
5117 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
5118 | stop_pc, ecs->stop_func_name) | |
5119 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) | |
5120 | { | |
5121 | /* Determine where this trampoline returns. */ | |
5122 | CORE_ADDR real_stop_pc; | |
5123 | ||
5124 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
5125 | ||
5126 | if (debug_infrun) | |
5127 | fprintf_unfiltered (gdb_stdlog, | |
5128 | "infrun: stepped into solib return tramp\n"); | |
5129 | ||
5130 | /* Only proceed through if we know where it's going. */ | |
5131 | if (real_stop_pc) | |
5132 | { | |
5133 | /* And put the step-breakpoint there and go until there. */ | |
5134 | struct symtab_and_line sr_sal; | |
5135 | ||
5136 | init_sal (&sr_sal); /* initialize to zeroes */ | |
5137 | sr_sal.pc = real_stop_pc; | |
5138 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
5139 | sr_sal.pspace = get_frame_program_space (frame); | |
5140 | ||
5141 | /* Do not specify what the fp should be when we stop since | |
5142 | on some machines the prologue is where the new fp value | |
5143 | is established. */ | |
5144 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
5145 | sr_sal, null_frame_id); | |
5146 | ||
5147 | /* Restart without fiddling with the step ranges or | |
5148 | other state. */ | |
5149 | keep_going (ecs); | |
5150 | return; | |
5151 | } | |
5152 | } | |
5153 | ||
c17eaafe DJ |
5154 | /* Check for subroutine calls. The check for the current frame |
5155 | equalling the step ID is not necessary - the check of the | |
5156 | previous frame's ID is sufficient - but it is a common case and | |
5157 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
5158 | |
5159 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
5160 | being equal, so to get into this block, both the current and | |
5161 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
5162 | /* The outer_frame_id check is a heuristic to detect stepping |
5163 | through startup code. If we step over an instruction which | |
5164 | sets the stack pointer from an invalid value to a valid value, | |
5165 | we may detect that as a subroutine call from the mythical | |
5166 | "outermost" function. This could be fixed by marking | |
5167 | outermost frames as !stack_p,code_p,special_p. Then the | |
5168 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 5169 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 5170 | for more. */ |
edb3359d | 5171 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 5172 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 5173 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
5174 | ecs->event_thread->control.step_stack_frame_id) |
5175 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 5176 | outer_frame_id) |
885eeb5b PA |
5177 | || (ecs->event_thread->control.step_start_function |
5178 | != find_pc_function (stop_pc))))) | |
488f131b | 5179 | { |
95918acb | 5180 | CORE_ADDR real_stop_pc; |
8fb3e588 | 5181 | |
527159b7 | 5182 | if (debug_infrun) |
8a9de0e4 | 5183 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 5184 | |
b7a084be | 5185 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
5186 | { |
5187 | /* I presume that step_over_calls is only 0 when we're | |
5188 | supposed to be stepping at the assembly language level | |
5189 | ("stepi"). Just stop. */ | |
388a8562 | 5190 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 5191 | end_stepping_range (ecs); |
95918acb AC |
5192 | return; |
5193 | } | |
8fb3e588 | 5194 | |
388a8562 MS |
5195 | /* Reverse stepping through solib trampolines. */ |
5196 | ||
5197 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 5198 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
5199 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
5200 | || (ecs->stop_func_start == 0 | |
5201 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
5202 | { | |
5203 | /* Any solib trampoline code can be handled in reverse | |
5204 | by simply continuing to single-step. We have already | |
5205 | executed the solib function (backwards), and a few | |
5206 | steps will take us back through the trampoline to the | |
5207 | caller. */ | |
5208 | keep_going (ecs); | |
5209 | return; | |
5210 | } | |
5211 | ||
16c381f0 | 5212 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 5213 | { |
b2175913 MS |
5214 | /* We're doing a "next". |
5215 | ||
5216 | Normal (forward) execution: set a breakpoint at the | |
5217 | callee's return address (the address at which the caller | |
5218 | will resume). | |
5219 | ||
5220 | Reverse (backward) execution. set the step-resume | |
5221 | breakpoint at the start of the function that we just | |
5222 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 5223 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
5224 | |
5225 | if (execution_direction == EXEC_REVERSE) | |
5226 | { | |
acf9414f JK |
5227 | /* If we're already at the start of the function, we've either |
5228 | just stepped backward into a single instruction function, | |
5229 | or stepped back out of a signal handler to the first instruction | |
5230 | of the function. Just keep going, which will single-step back | |
5231 | to the caller. */ | |
58c48e72 | 5232 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f JK |
5233 | { |
5234 | struct symtab_and_line sr_sal; | |
5235 | ||
5236 | /* Normal function call return (static or dynamic). */ | |
5237 | init_sal (&sr_sal); | |
5238 | sr_sal.pc = ecs->stop_func_start; | |
5239 | sr_sal.pspace = get_frame_program_space (frame); | |
5240 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
5241 | sr_sal, null_frame_id); | |
5242 | } | |
b2175913 MS |
5243 | } |
5244 | else | |
568d6575 | 5245 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 5246 | |
8567c30f AC |
5247 | keep_going (ecs); |
5248 | return; | |
5249 | } | |
a53c66de | 5250 | |
95918acb | 5251 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
5252 | calling routine and the real function), locate the real |
5253 | function. That's what tells us (a) whether we want to step | |
5254 | into it at all, and (b) what prologue we want to run to the | |
5255 | end of, if we do step into it. */ | |
568d6575 | 5256 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 5257 | if (real_stop_pc == 0) |
568d6575 | 5258 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
5259 | if (real_stop_pc != 0) |
5260 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 5261 | |
db5f024e | 5262 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 RC |
5263 | { |
5264 | struct symtab_and_line sr_sal; | |
abbb1732 | 5265 | |
1b2bfbb9 RC |
5266 | init_sal (&sr_sal); |
5267 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 5268 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 5269 | |
a6d9a66e UW |
5270 | insert_step_resume_breakpoint_at_sal (gdbarch, |
5271 | sr_sal, null_frame_id); | |
8fb3e588 AC |
5272 | keep_going (ecs); |
5273 | return; | |
1b2bfbb9 RC |
5274 | } |
5275 | ||
95918acb | 5276 | /* If we have line number information for the function we are |
1bfeeb0f JL |
5277 | thinking of stepping into and the function isn't on the skip |
5278 | list, step into it. | |
95918acb | 5279 | |
8fb3e588 AC |
5280 | If there are several symtabs at that PC (e.g. with include |
5281 | files), just want to know whether *any* of them have line | |
5282 | numbers. find_pc_line handles this. */ | |
95918acb AC |
5283 | { |
5284 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 5285 | |
95918acb | 5286 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 5287 | if (tmp_sal.line != 0 |
85817405 JK |
5288 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
5289 | &tmp_sal)) | |
95918acb | 5290 | { |
b2175913 | 5291 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 5292 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 5293 | else |
568d6575 | 5294 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
5295 | return; |
5296 | } | |
5297 | } | |
5298 | ||
5299 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
5300 | set, we stop the step so that the user has a chance to switch |
5301 | in assembly mode. */ | |
16c381f0 | 5302 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 5303 | && step_stop_if_no_debug) |
95918acb | 5304 | { |
bdc36728 | 5305 | end_stepping_range (ecs); |
95918acb AC |
5306 | return; |
5307 | } | |
5308 | ||
b2175913 MS |
5309 | if (execution_direction == EXEC_REVERSE) |
5310 | { | |
acf9414f JK |
5311 | /* If we're already at the start of the function, we've either just |
5312 | stepped backward into a single instruction function without line | |
5313 | number info, or stepped back out of a signal handler to the first | |
5314 | instruction of the function without line number info. Just keep | |
5315 | going, which will single-step back to the caller. */ | |
5316 | if (ecs->stop_func_start != stop_pc) | |
5317 | { | |
5318 | /* Set a breakpoint at callee's start address. | |
5319 | From there we can step once and be back in the caller. */ | |
5320 | struct symtab_and_line sr_sal; | |
abbb1732 | 5321 | |
acf9414f JK |
5322 | init_sal (&sr_sal); |
5323 | sr_sal.pc = ecs->stop_func_start; | |
5324 | sr_sal.pspace = get_frame_program_space (frame); | |
5325 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
5326 | sr_sal, null_frame_id); | |
5327 | } | |
b2175913 MS |
5328 | } |
5329 | else | |
5330 | /* Set a breakpoint at callee's return address (the address | |
5331 | at which the caller will resume). */ | |
568d6575 | 5332 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 5333 | |
95918acb | 5334 | keep_going (ecs); |
488f131b | 5335 | return; |
488f131b | 5336 | } |
c906108c | 5337 | |
fdd654f3 MS |
5338 | /* Reverse stepping through solib trampolines. */ |
5339 | ||
5340 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 5341 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 MS |
5342 | { |
5343 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
5344 | || (ecs->stop_func_start == 0 | |
5345 | && in_solib_dynsym_resolve_code (stop_pc))) | |
5346 | { | |
5347 | /* Any solib trampoline code can be handled in reverse | |
5348 | by simply continuing to single-step. We have already | |
5349 | executed the solib function (backwards), and a few | |
5350 | steps will take us back through the trampoline to the | |
5351 | caller. */ | |
5352 | keep_going (ecs); | |
5353 | return; | |
5354 | } | |
5355 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
5356 | { | |
5357 | /* Stepped backward into the solib dynsym resolver. | |
5358 | Set a breakpoint at its start and continue, then | |
5359 | one more step will take us out. */ | |
5360 | struct symtab_and_line sr_sal; | |
abbb1732 | 5361 | |
fdd654f3 MS |
5362 | init_sal (&sr_sal); |
5363 | sr_sal.pc = ecs->stop_func_start; | |
9d1807c3 | 5364 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
5365 | insert_step_resume_breakpoint_at_sal (gdbarch, |
5366 | sr_sal, null_frame_id); | |
5367 | keep_going (ecs); | |
5368 | return; | |
5369 | } | |
5370 | } | |
5371 | ||
2afb61aa | 5372 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 5373 | |
1b2bfbb9 RC |
5374 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
5375 | the trampoline processing logic, however, there are some trampolines | |
5376 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 5377 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 5378 | && ecs->stop_func_name == NULL |
2afb61aa | 5379 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 5380 | { |
527159b7 | 5381 | if (debug_infrun) |
3e43a32a MS |
5382 | fprintf_unfiltered (gdb_stdlog, |
5383 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 5384 | |
1b2bfbb9 | 5385 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
5386 | undebuggable function (where there is no debugging information |
5387 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
5388 | inferior stopped). Since we want to skip this kind of code, |
5389 | we keep going until the inferior returns from this | |
14e60db5 DJ |
5390 | function - unless the user has asked us not to (via |
5391 | set step-mode) or we no longer know how to get back | |
5392 | to the call site. */ | |
5393 | if (step_stop_if_no_debug | |
c7ce8faa | 5394 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
5395 | { |
5396 | /* If we have no line number and the step-stop-if-no-debug | |
5397 | is set, we stop the step so that the user has a chance to | |
5398 | switch in assembly mode. */ | |
bdc36728 | 5399 | end_stepping_range (ecs); |
1b2bfbb9 RC |
5400 | return; |
5401 | } | |
5402 | else | |
5403 | { | |
5404 | /* Set a breakpoint at callee's return address (the address | |
5405 | at which the caller will resume). */ | |
568d6575 | 5406 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
5407 | keep_going (ecs); |
5408 | return; | |
5409 | } | |
5410 | } | |
5411 | ||
16c381f0 | 5412 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
5413 | { |
5414 | /* It is stepi or nexti. We always want to stop stepping after | |
5415 | one instruction. */ | |
527159b7 | 5416 | if (debug_infrun) |
8a9de0e4 | 5417 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 5418 | end_stepping_range (ecs); |
1b2bfbb9 RC |
5419 | return; |
5420 | } | |
5421 | ||
2afb61aa | 5422 | if (stop_pc_sal.line == 0) |
488f131b JB |
5423 | { |
5424 | /* We have no line number information. That means to stop | |
5425 | stepping (does this always happen right after one instruction, | |
5426 | when we do "s" in a function with no line numbers, | |
5427 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 5428 | if (debug_infrun) |
8a9de0e4 | 5429 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 5430 | end_stepping_range (ecs); |
488f131b JB |
5431 | return; |
5432 | } | |
c906108c | 5433 | |
edb3359d DJ |
5434 | /* Look for "calls" to inlined functions, part one. If the inline |
5435 | frame machinery detected some skipped call sites, we have entered | |
5436 | a new inline function. */ | |
5437 | ||
5438 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 5439 | ecs->event_thread->control.step_frame_id) |
edb3359d DJ |
5440 | && inline_skipped_frames (ecs->ptid)) |
5441 | { | |
5442 | struct symtab_and_line call_sal; | |
5443 | ||
5444 | if (debug_infrun) | |
5445 | fprintf_unfiltered (gdb_stdlog, | |
5446 | "infrun: stepped into inlined function\n"); | |
5447 | ||
5448 | find_frame_sal (get_current_frame (), &call_sal); | |
5449 | ||
16c381f0 | 5450 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
5451 | { |
5452 | /* For "step", we're going to stop. But if the call site | |
5453 | for this inlined function is on the same source line as | |
5454 | we were previously stepping, go down into the function | |
5455 | first. Otherwise stop at the call site. */ | |
5456 | ||
5457 | if (call_sal.line == ecs->event_thread->current_line | |
5458 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
5459 | step_into_inline_frame (ecs->ptid); | |
5460 | ||
bdc36728 | 5461 | end_stepping_range (ecs); |
edb3359d DJ |
5462 | return; |
5463 | } | |
5464 | else | |
5465 | { | |
5466 | /* For "next", we should stop at the call site if it is on a | |
5467 | different source line. Otherwise continue through the | |
5468 | inlined function. */ | |
5469 | if (call_sal.line == ecs->event_thread->current_line | |
5470 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
5471 | keep_going (ecs); | |
5472 | else | |
bdc36728 | 5473 | end_stepping_range (ecs); |
edb3359d DJ |
5474 | return; |
5475 | } | |
5476 | } | |
5477 | ||
5478 | /* Look for "calls" to inlined functions, part two. If we are still | |
5479 | in the same real function we were stepping through, but we have | |
5480 | to go further up to find the exact frame ID, we are stepping | |
5481 | through a more inlined call beyond its call site. */ | |
5482 | ||
5483 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
5484 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 5485 | ecs->event_thread->control.step_frame_id) |
edb3359d | 5486 | && stepped_in_from (get_current_frame (), |
16c381f0 | 5487 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
5488 | { |
5489 | if (debug_infrun) | |
5490 | fprintf_unfiltered (gdb_stdlog, | |
5491 | "infrun: stepping through inlined function\n"); | |
5492 | ||
16c381f0 | 5493 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
5494 | keep_going (ecs); |
5495 | else | |
bdc36728 | 5496 | end_stepping_range (ecs); |
edb3359d DJ |
5497 | return; |
5498 | } | |
5499 | ||
2afb61aa | 5500 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
5501 | && (ecs->event_thread->current_line != stop_pc_sal.line |
5502 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
5503 | { |
5504 | /* We are at the start of a different line. So stop. Note that | |
5505 | we don't stop if we step into the middle of a different line. | |
5506 | That is said to make things like for (;;) statements work | |
5507 | better. */ | |
527159b7 | 5508 | if (debug_infrun) |
3e43a32a MS |
5509 | fprintf_unfiltered (gdb_stdlog, |
5510 | "infrun: stepped to a different line\n"); | |
bdc36728 | 5511 | end_stepping_range (ecs); |
488f131b JB |
5512 | return; |
5513 | } | |
c906108c | 5514 | |
488f131b | 5515 | /* We aren't done stepping. |
c906108c | 5516 | |
488f131b JB |
5517 | Optimize by setting the stepping range to the line. |
5518 | (We might not be in the original line, but if we entered a | |
5519 | new line in mid-statement, we continue stepping. This makes | |
5520 | things like for(;;) statements work better.) */ | |
c906108c | 5521 | |
16c381f0 JK |
5522 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
5523 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 5524 | ecs->event_thread->control.may_range_step = 1; |
edb3359d | 5525 | set_step_info (frame, stop_pc_sal); |
488f131b | 5526 | |
527159b7 | 5527 | if (debug_infrun) |
8a9de0e4 | 5528 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 5529 | keep_going (ecs); |
104c1213 JM |
5530 | } |
5531 | ||
c447ac0b PA |
5532 | /* In all-stop mode, if we're currently stepping but have stopped in |
5533 | some other thread, we may need to switch back to the stepped | |
5534 | thread. Returns true we set the inferior running, false if we left | |
5535 | it stopped (and the event needs further processing). */ | |
5536 | ||
5537 | static int | |
5538 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
5539 | { | |
5540 | if (!non_stop) | |
5541 | { | |
5542 | struct thread_info *tp; | |
99619bea | 5543 | struct thread_info *stepping_thread; |
483805cf | 5544 | struct thread_info *step_over; |
99619bea PA |
5545 | |
5546 | /* If any thread is blocked on some internal breakpoint, and we | |
5547 | simply need to step over that breakpoint to get it going | |
5548 | again, do that first. */ | |
5549 | ||
5550 | /* However, if we see an event for the stepping thread, then we | |
5551 | know all other threads have been moved past their breakpoints | |
5552 | already. Let the caller check whether the step is finished, | |
5553 | etc., before deciding to move it past a breakpoint. */ | |
5554 | if (ecs->event_thread->control.step_range_end != 0) | |
5555 | return 0; | |
5556 | ||
5557 | /* Check if the current thread is blocked on an incomplete | |
5558 | step-over, interrupted by a random signal. */ | |
5559 | if (ecs->event_thread->control.trap_expected | |
5560 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 5561 | { |
99619bea PA |
5562 | if (debug_infrun) |
5563 | { | |
5564 | fprintf_unfiltered (gdb_stdlog, | |
5565 | "infrun: need to finish step-over of [%s]\n", | |
5566 | target_pid_to_str (ecs->event_thread->ptid)); | |
5567 | } | |
5568 | keep_going (ecs); | |
5569 | return 1; | |
5570 | } | |
2adfaa28 | 5571 | |
99619bea PA |
5572 | /* Check if the current thread is blocked by a single-step |
5573 | breakpoint of another thread. */ | |
5574 | if (ecs->hit_singlestep_breakpoint) | |
5575 | { | |
5576 | if (debug_infrun) | |
5577 | { | |
5578 | fprintf_unfiltered (gdb_stdlog, | |
5579 | "infrun: need to step [%s] over single-step " | |
5580 | "breakpoint\n", | |
5581 | target_pid_to_str (ecs->ptid)); | |
5582 | } | |
5583 | keep_going (ecs); | |
5584 | return 1; | |
5585 | } | |
5586 | ||
483805cf PA |
5587 | /* Otherwise, we no longer expect a trap in the current thread. |
5588 | Clear the trap_expected flag before switching back -- this is | |
5589 | what keep_going does as well, if we call it. */ | |
5590 | ecs->event_thread->control.trap_expected = 0; | |
5591 | ||
70509625 PA |
5592 | /* Likewise, clear the signal if it should not be passed. */ |
5593 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
5594 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
5595 | ||
483805cf PA |
5596 | /* If scheduler locking applies even if not stepping, there's no |
5597 | need to walk over threads. Above we've checked whether the | |
5598 | current thread is stepping. If some other thread not the | |
5599 | event thread is stepping, then it must be that scheduler | |
5600 | locking is not in effect. */ | |
856e7dd6 | 5601 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
5602 | return 0; |
5603 | ||
5604 | /* Look for the stepping/nexting thread, and check if any other | |
5605 | thread other than the stepping thread needs to start a | |
5606 | step-over. Do all step-overs before actually proceeding with | |
5607 | step/next/etc. */ | |
5608 | stepping_thread = NULL; | |
5609 | step_over = NULL; | |
034f788c | 5610 | ALL_NON_EXITED_THREADS (tp) |
483805cf PA |
5611 | { |
5612 | /* Ignore threads of processes we're not resuming. */ | |
5613 | if (!sched_multi | |
5614 | && ptid_get_pid (tp->ptid) != ptid_get_pid (inferior_ptid)) | |
5615 | continue; | |
5616 | ||
5617 | /* When stepping over a breakpoint, we lock all threads | |
5618 | except the one that needs to move past the breakpoint. | |
5619 | If a non-event thread has this set, the "incomplete | |
5620 | step-over" check above should have caught it earlier. */ | |
5621 | gdb_assert (!tp->control.trap_expected); | |
5622 | ||
5623 | /* Did we find the stepping thread? */ | |
5624 | if (tp->control.step_range_end) | |
5625 | { | |
5626 | /* Yep. There should only one though. */ | |
5627 | gdb_assert (stepping_thread == NULL); | |
5628 | ||
5629 | /* The event thread is handled at the top, before we | |
5630 | enter this loop. */ | |
5631 | gdb_assert (tp != ecs->event_thread); | |
5632 | ||
5633 | /* If some thread other than the event thread is | |
5634 | stepping, then scheduler locking can't be in effect, | |
5635 | otherwise we wouldn't have resumed the current event | |
5636 | thread in the first place. */ | |
856e7dd6 | 5637 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
5638 | |
5639 | stepping_thread = tp; | |
5640 | } | |
5641 | else if (thread_still_needs_step_over (tp)) | |
5642 | { | |
5643 | step_over = tp; | |
5644 | ||
5645 | /* At the top we've returned early if the event thread | |
5646 | is stepping. If some other thread not the event | |
5647 | thread is stepping, then scheduler locking can't be | |
5648 | in effect, and we can resume this thread. No need to | |
5649 | keep looking for the stepping thread then. */ | |
5650 | break; | |
5651 | } | |
5652 | } | |
99619bea | 5653 | |
483805cf | 5654 | if (step_over != NULL) |
99619bea | 5655 | { |
483805cf | 5656 | tp = step_over; |
99619bea | 5657 | if (debug_infrun) |
c447ac0b | 5658 | { |
99619bea PA |
5659 | fprintf_unfiltered (gdb_stdlog, |
5660 | "infrun: need to step-over [%s]\n", | |
5661 | target_pid_to_str (tp->ptid)); | |
c447ac0b PA |
5662 | } |
5663 | ||
483805cf | 5664 | /* Only the stepping thread should have this set. */ |
99619bea PA |
5665 | gdb_assert (tp->control.step_range_end == 0); |
5666 | ||
99619bea PA |
5667 | ecs->ptid = tp->ptid; |
5668 | ecs->event_thread = tp; | |
5669 | switch_to_thread (ecs->ptid); | |
5670 | keep_going (ecs); | |
5671 | return 1; | |
5672 | } | |
5673 | ||
483805cf | 5674 | if (stepping_thread != NULL) |
99619bea PA |
5675 | { |
5676 | struct frame_info *frame; | |
5677 | struct gdbarch *gdbarch; | |
5678 | ||
483805cf PA |
5679 | tp = stepping_thread; |
5680 | ||
c447ac0b PA |
5681 | /* If the stepping thread exited, then don't try to switch |
5682 | back and resume it, which could fail in several different | |
5683 | ways depending on the target. Instead, just keep going. | |
5684 | ||
5685 | We can find a stepping dead thread in the thread list in | |
5686 | two cases: | |
5687 | ||
5688 | - The target supports thread exit events, and when the | |
5689 | target tries to delete the thread from the thread list, | |
5690 | inferior_ptid pointed at the exiting thread. In such | |
5691 | case, calling delete_thread does not really remove the | |
5692 | thread from the list; instead, the thread is left listed, | |
5693 | with 'exited' state. | |
5694 | ||
5695 | - The target's debug interface does not support thread | |
5696 | exit events, and so we have no idea whatsoever if the | |
5697 | previously stepping thread is still alive. For that | |
5698 | reason, we need to synchronously query the target | |
5699 | now. */ | |
5700 | if (is_exited (tp->ptid) | |
5701 | || !target_thread_alive (tp->ptid)) | |
5702 | { | |
5703 | if (debug_infrun) | |
5704 | fprintf_unfiltered (gdb_stdlog, | |
5705 | "infrun: not switching back to " | |
5706 | "stepped thread, it has vanished\n"); | |
5707 | ||
5708 | delete_thread (tp->ptid); | |
5709 | keep_going (ecs); | |
5710 | return 1; | |
5711 | } | |
5712 | ||
c447ac0b PA |
5713 | if (debug_infrun) |
5714 | fprintf_unfiltered (gdb_stdlog, | |
5715 | "infrun: switching back to stepped thread\n"); | |
5716 | ||
5717 | ecs->event_thread = tp; | |
5718 | ecs->ptid = tp->ptid; | |
5719 | context_switch (ecs->ptid); | |
2adfaa28 PA |
5720 | |
5721 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
5722 | frame = get_current_frame (); | |
5723 | gdbarch = get_frame_arch (frame); | |
5724 | ||
5725 | /* If the PC of the thread we were trying to single-step has | |
99619bea PA |
5726 | changed, then that thread has trapped or been signaled, |
5727 | but the event has not been reported to GDB yet. Re-poll | |
5728 | the target looking for this particular thread's event | |
5729 | (i.e. temporarily enable schedlock) by: | |
2adfaa28 PA |
5730 | |
5731 | - setting a break at the current PC | |
5732 | - resuming that particular thread, only (by setting | |
5733 | trap expected) | |
5734 | ||
5735 | This prevents us continuously moving the single-step | |
5736 | breakpoint forward, one instruction at a time, | |
5737 | overstepping. */ | |
5738 | ||
af48d08f | 5739 | if (stop_pc != tp->prev_pc) |
2adfaa28 | 5740 | { |
64ce06e4 PA |
5741 | ptid_t resume_ptid; |
5742 | ||
2adfaa28 PA |
5743 | if (debug_infrun) |
5744 | fprintf_unfiltered (gdb_stdlog, | |
5745 | "infrun: expected thread advanced also\n"); | |
5746 | ||
7c16b83e PA |
5747 | /* Clear the info of the previous step-over, as it's no |
5748 | longer valid. It's what keep_going would do too, if | |
5749 | we called it. Must do this before trying to insert | |
5750 | the sss breakpoint, otherwise if we were previously | |
5751 | trying to step over this exact address in another | |
5752 | thread, the breakpoint ends up not installed. */ | |
5753 | clear_step_over_info (); | |
5754 | ||
2adfaa28 PA |
5755 | insert_single_step_breakpoint (get_frame_arch (frame), |
5756 | get_frame_address_space (frame), | |
5757 | stop_pc); | |
2adfaa28 | 5758 | |
64ce06e4 PA |
5759 | resume_ptid = user_visible_resume_ptid (tp->control.stepping_command); |
5760 | do_target_resume (resume_ptid, | |
5761 | currently_stepping (tp), GDB_SIGNAL_0); | |
2adfaa28 PA |
5762 | prepare_to_wait (ecs); |
5763 | } | |
5764 | else | |
5765 | { | |
5766 | if (debug_infrun) | |
5767 | fprintf_unfiltered (gdb_stdlog, | |
5768 | "infrun: expected thread still " | |
5769 | "hasn't advanced\n"); | |
5770 | keep_going (ecs); | |
5771 | } | |
5772 | ||
c447ac0b PA |
5773 | return 1; |
5774 | } | |
5775 | } | |
5776 | return 0; | |
5777 | } | |
5778 | ||
b3444185 | 5779 | /* Is thread TP in the middle of single-stepping? */ |
104c1213 | 5780 | |
a289b8f6 | 5781 | static int |
b3444185 | 5782 | currently_stepping (struct thread_info *tp) |
a7212384 | 5783 | { |
8358c15c JK |
5784 | return ((tp->control.step_range_end |
5785 | && tp->control.step_resume_breakpoint == NULL) | |
5786 | || tp->control.trap_expected | |
af48d08f | 5787 | || tp->stepped_breakpoint |
8358c15c | 5788 | || bpstat_should_step ()); |
a7212384 UW |
5789 | } |
5790 | ||
b2175913 MS |
5791 | /* Inferior has stepped into a subroutine call with source code that |
5792 | we should not step over. Do step to the first line of code in | |
5793 | it. */ | |
c2c6d25f JM |
5794 | |
5795 | static void | |
568d6575 UW |
5796 | handle_step_into_function (struct gdbarch *gdbarch, |
5797 | struct execution_control_state *ecs) | |
c2c6d25f | 5798 | { |
43f3e411 | 5799 | struct compunit_symtab *cust; |
2afb61aa | 5800 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f | 5801 | |
7e324e48 GB |
5802 | fill_in_stop_func (gdbarch, ecs); |
5803 | ||
43f3e411 DE |
5804 | cust = find_pc_compunit_symtab (stop_pc); |
5805 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 5806 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 | 5807 | ecs->stop_func_start); |
c2c6d25f | 5808 | |
2afb61aa | 5809 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
5810 | /* Use the step_resume_break to step until the end of the prologue, |
5811 | even if that involves jumps (as it seems to on the vax under | |
5812 | 4.2). */ | |
5813 | /* If the prologue ends in the middle of a source line, continue to | |
5814 | the end of that source line (if it is still within the function). | |
5815 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
5816 | if (stop_func_sal.end |
5817 | && stop_func_sal.pc != ecs->stop_func_start | |
5818 | && stop_func_sal.end < ecs->stop_func_end) | |
5819 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 5820 | |
2dbd5e30 KB |
5821 | /* Architectures which require breakpoint adjustment might not be able |
5822 | to place a breakpoint at the computed address. If so, the test | |
5823 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
5824 | ecs->stop_func_start to an address at which a breakpoint may be | |
5825 | legitimately placed. | |
8fb3e588 | 5826 | |
2dbd5e30 KB |
5827 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
5828 | made, GDB will enter an infinite loop when stepping through | |
5829 | optimized code consisting of VLIW instructions which contain | |
5830 | subinstructions corresponding to different source lines. On | |
5831 | FR-V, it's not permitted to place a breakpoint on any but the | |
5832 | first subinstruction of a VLIW instruction. When a breakpoint is | |
5833 | set, GDB will adjust the breakpoint address to the beginning of | |
5834 | the VLIW instruction. Thus, we need to make the corresponding | |
5835 | adjustment here when computing the stop address. */ | |
8fb3e588 | 5836 | |
568d6575 | 5837 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
5838 | { |
5839 | ecs->stop_func_start | |
568d6575 | 5840 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 5841 | ecs->stop_func_start); |
2dbd5e30 KB |
5842 | } |
5843 | ||
c2c6d25f JM |
5844 | if (ecs->stop_func_start == stop_pc) |
5845 | { | |
5846 | /* We are already there: stop now. */ | |
bdc36728 | 5847 | end_stepping_range (ecs); |
c2c6d25f JM |
5848 | return; |
5849 | } | |
5850 | else | |
5851 | { | |
5852 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 5853 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
5854 | sr_sal.pc = ecs->stop_func_start; |
5855 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 5856 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 5857 | |
c2c6d25f | 5858 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
5859 | some machines the prologue is where the new fp value is |
5860 | established. */ | |
a6d9a66e | 5861 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
5862 | |
5863 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
5864 | ecs->event_thread->control.step_range_end |
5865 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
5866 | } |
5867 | keep_going (ecs); | |
5868 | } | |
d4f3574e | 5869 | |
b2175913 MS |
5870 | /* Inferior has stepped backward into a subroutine call with source |
5871 | code that we should not step over. Do step to the beginning of the | |
5872 | last line of code in it. */ | |
5873 | ||
5874 | static void | |
568d6575 UW |
5875 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
5876 | struct execution_control_state *ecs) | |
b2175913 | 5877 | { |
43f3e411 | 5878 | struct compunit_symtab *cust; |
167e4384 | 5879 | struct symtab_and_line stop_func_sal; |
b2175913 | 5880 | |
7e324e48 GB |
5881 | fill_in_stop_func (gdbarch, ecs); |
5882 | ||
43f3e411 DE |
5883 | cust = find_pc_compunit_symtab (stop_pc); |
5884 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 5885 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 MS |
5886 | ecs->stop_func_start); |
5887 | ||
5888 | stop_func_sal = find_pc_line (stop_pc, 0); | |
5889 | ||
5890 | /* OK, we're just going to keep stepping here. */ | |
5891 | if (stop_func_sal.pc == stop_pc) | |
5892 | { | |
5893 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 5894 | end_stepping_range (ecs); |
b2175913 MS |
5895 | } |
5896 | else | |
5897 | { | |
5898 | /* Else just reset the step range and keep going. | |
5899 | No step-resume breakpoint, they don't work for | |
5900 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
5901 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
5902 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
5903 | keep_going (ecs); |
5904 | } | |
5905 | return; | |
5906 | } | |
5907 | ||
d3169d93 | 5908 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
5909 | This is used to both functions and to skip over code. */ |
5910 | ||
5911 | static void | |
2c03e5be PA |
5912 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
5913 | struct symtab_and_line sr_sal, | |
5914 | struct frame_id sr_id, | |
5915 | enum bptype sr_type) | |
44cbf7b5 | 5916 | { |
611c83ae PA |
5917 | /* There should never be more than one step-resume or longjmp-resume |
5918 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 5919 | step_resume_breakpoint when one is already active. */ |
8358c15c | 5920 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 5921 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
5922 | |
5923 | if (debug_infrun) | |
5924 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5925 | "infrun: inserting step-resume breakpoint at %s\n", |
5926 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 5927 | |
8358c15c | 5928 | inferior_thread ()->control.step_resume_breakpoint |
2c03e5be PA |
5929 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type); |
5930 | } | |
5931 | ||
9da8c2a0 | 5932 | void |
2c03e5be PA |
5933 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
5934 | struct symtab_and_line sr_sal, | |
5935 | struct frame_id sr_id) | |
5936 | { | |
5937 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
5938 | sr_sal, sr_id, | |
5939 | bp_step_resume); | |
44cbf7b5 | 5940 | } |
7ce450bd | 5941 | |
2c03e5be PA |
5942 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
5943 | This is used to skip a potential signal handler. | |
7ce450bd | 5944 | |
14e60db5 DJ |
5945 | This is called with the interrupted function's frame. The signal |
5946 | handler, when it returns, will resume the interrupted function at | |
5947 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
5948 | |
5949 | static void | |
2c03e5be | 5950 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
5951 | { |
5952 | struct symtab_and_line sr_sal; | |
a6d9a66e | 5953 | struct gdbarch *gdbarch; |
d303a6c7 | 5954 | |
f4c1edd8 | 5955 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
5956 | init_sal (&sr_sal); /* initialize to zeros */ |
5957 | ||
a6d9a66e | 5958 | gdbarch = get_frame_arch (return_frame); |
568d6575 | 5959 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 5960 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5961 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 5962 | |
2c03e5be PA |
5963 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
5964 | get_stack_frame_id (return_frame), | |
5965 | bp_hp_step_resume); | |
d303a6c7 AC |
5966 | } |
5967 | ||
2c03e5be PA |
5968 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
5969 | is used to skip a function after stepping into it (for "next" or if | |
5970 | the called function has no debugging information). | |
14e60db5 DJ |
5971 | |
5972 | The current function has almost always been reached by single | |
5973 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
5974 | current function, and the breakpoint will be set at the caller's | |
5975 | resume address. | |
5976 | ||
5977 | This is a separate function rather than reusing | |
2c03e5be | 5978 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 5979 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 5980 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
5981 | |
5982 | static void | |
5983 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
5984 | { | |
5985 | struct symtab_and_line sr_sal; | |
a6d9a66e | 5986 | struct gdbarch *gdbarch; |
14e60db5 DJ |
5987 | |
5988 | /* We shouldn't have gotten here if we don't know where the call site | |
5989 | is. */ | |
c7ce8faa | 5990 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 DJ |
5991 | |
5992 | init_sal (&sr_sal); /* initialize to zeros */ | |
5993 | ||
a6d9a66e | 5994 | gdbarch = frame_unwind_caller_arch (next_frame); |
c7ce8faa DJ |
5995 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
5996 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 5997 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5998 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 5999 | |
a6d9a66e | 6000 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 6001 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
6002 | } |
6003 | ||
611c83ae PA |
6004 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
6005 | new breakpoint at the target of a jmp_buf. The handling of | |
6006 | longjmp-resume uses the same mechanisms used for handling | |
6007 | "step-resume" breakpoints. */ | |
6008 | ||
6009 | static void | |
a6d9a66e | 6010 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 6011 | { |
e81a37f7 TT |
6012 | /* There should never be more than one longjmp-resume breakpoint per |
6013 | thread, so we should never be setting a new | |
611c83ae | 6014 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 6015 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
6016 | |
6017 | if (debug_infrun) | |
6018 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
6019 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
6020 | paddress (gdbarch, pc)); | |
611c83ae | 6021 | |
e81a37f7 | 6022 | inferior_thread ()->control.exception_resume_breakpoint = |
a6d9a66e | 6023 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); |
611c83ae PA |
6024 | } |
6025 | ||
186c406b TT |
6026 | /* Insert an exception resume breakpoint. TP is the thread throwing |
6027 | the exception. The block B is the block of the unwinder debug hook | |
6028 | function. FRAME is the frame corresponding to the call to this | |
6029 | function. SYM is the symbol of the function argument holding the | |
6030 | target PC of the exception. */ | |
6031 | ||
6032 | static void | |
6033 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 6034 | const struct block *b, |
186c406b TT |
6035 | struct frame_info *frame, |
6036 | struct symbol *sym) | |
6037 | { | |
492d29ea | 6038 | TRY |
186c406b TT |
6039 | { |
6040 | struct symbol *vsym; | |
6041 | struct value *value; | |
6042 | CORE_ADDR handler; | |
6043 | struct breakpoint *bp; | |
6044 | ||
6045 | vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL); | |
6046 | value = read_var_value (vsym, frame); | |
6047 | /* If the value was optimized out, revert to the old behavior. */ | |
6048 | if (! value_optimized_out (value)) | |
6049 | { | |
6050 | handler = value_as_address (value); | |
6051 | ||
6052 | if (debug_infrun) | |
6053 | fprintf_unfiltered (gdb_stdlog, | |
6054 | "infrun: exception resume at %lx\n", | |
6055 | (unsigned long) handler); | |
6056 | ||
6057 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
6058 | handler, bp_exception_resume); | |
c70a6932 JK |
6059 | |
6060 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
6061 | frame = NULL; | |
6062 | ||
186c406b TT |
6063 | bp->thread = tp->num; |
6064 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
6065 | } | |
6066 | } | |
492d29ea PA |
6067 | CATCH (e, RETURN_MASK_ERROR) |
6068 | { | |
6069 | /* We want to ignore errors here. */ | |
6070 | } | |
6071 | END_CATCH | |
186c406b TT |
6072 | } |
6073 | ||
28106bc2 SDJ |
6074 | /* A helper for check_exception_resume that sets an |
6075 | exception-breakpoint based on a SystemTap probe. */ | |
6076 | ||
6077 | static void | |
6078 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 6079 | const struct bound_probe *probe, |
28106bc2 SDJ |
6080 | struct frame_info *frame) |
6081 | { | |
6082 | struct value *arg_value; | |
6083 | CORE_ADDR handler; | |
6084 | struct breakpoint *bp; | |
6085 | ||
6086 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
6087 | if (!arg_value) | |
6088 | return; | |
6089 | ||
6090 | handler = value_as_address (arg_value); | |
6091 | ||
6092 | if (debug_infrun) | |
6093 | fprintf_unfiltered (gdb_stdlog, | |
6094 | "infrun: exception resume at %s\n", | |
6bac7473 | 6095 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
6096 | handler)); |
6097 | ||
6098 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
6099 | handler, bp_exception_resume); | |
6100 | bp->thread = tp->num; | |
6101 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
6102 | } | |
6103 | ||
186c406b TT |
6104 | /* This is called when an exception has been intercepted. Check to |
6105 | see whether the exception's destination is of interest, and if so, | |
6106 | set an exception resume breakpoint there. */ | |
6107 | ||
6108 | static void | |
6109 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 6110 | struct frame_info *frame) |
186c406b | 6111 | { |
729662a5 | 6112 | struct bound_probe probe; |
28106bc2 SDJ |
6113 | struct symbol *func; |
6114 | ||
6115 | /* First see if this exception unwinding breakpoint was set via a | |
6116 | SystemTap probe point. If so, the probe has two arguments: the | |
6117 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
6118 | set a breakpoint there. */ | |
6bac7473 | 6119 | probe = find_probe_by_pc (get_frame_pc (frame)); |
729662a5 | 6120 | if (probe.probe) |
28106bc2 | 6121 | { |
729662a5 | 6122 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
6123 | return; |
6124 | } | |
6125 | ||
6126 | func = get_frame_function (frame); | |
6127 | if (!func) | |
6128 | return; | |
186c406b | 6129 | |
492d29ea | 6130 | TRY |
186c406b | 6131 | { |
3977b71f | 6132 | const struct block *b; |
8157b174 | 6133 | struct block_iterator iter; |
186c406b TT |
6134 | struct symbol *sym; |
6135 | int argno = 0; | |
6136 | ||
6137 | /* The exception breakpoint is a thread-specific breakpoint on | |
6138 | the unwinder's debug hook, declared as: | |
6139 | ||
6140 | void _Unwind_DebugHook (void *cfa, void *handler); | |
6141 | ||
6142 | The CFA argument indicates the frame to which control is | |
6143 | about to be transferred. HANDLER is the destination PC. | |
6144 | ||
6145 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
6146 | This is not extremely efficient but it avoids issues in gdb | |
6147 | with computing the DWARF CFA, and it also works even in weird | |
6148 | cases such as throwing an exception from inside a signal | |
6149 | handler. */ | |
6150 | ||
6151 | b = SYMBOL_BLOCK_VALUE (func); | |
6152 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
6153 | { | |
6154 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
6155 | continue; | |
6156 | ||
6157 | if (argno == 0) | |
6158 | ++argno; | |
6159 | else | |
6160 | { | |
6161 | insert_exception_resume_breakpoint (ecs->event_thread, | |
6162 | b, frame, sym); | |
6163 | break; | |
6164 | } | |
6165 | } | |
6166 | } | |
492d29ea PA |
6167 | CATCH (e, RETURN_MASK_ERROR) |
6168 | { | |
6169 | } | |
6170 | END_CATCH | |
186c406b TT |
6171 | } |
6172 | ||
104c1213 | 6173 | static void |
22bcd14b | 6174 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 6175 | { |
527159b7 | 6176 | if (debug_infrun) |
22bcd14b | 6177 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 6178 | |
31e77af2 PA |
6179 | clear_step_over_info (); |
6180 | ||
cd0fc7c3 SS |
6181 | /* Let callers know we don't want to wait for the inferior anymore. */ |
6182 | ecs->wait_some_more = 0; | |
6183 | } | |
6184 | ||
a9ba6bae PA |
6185 | /* Called when we should continue running the inferior, because the |
6186 | current event doesn't cause a user visible stop. This does the | |
6187 | resuming part; waiting for the next event is done elsewhere. */ | |
d4f3574e SS |
6188 | |
6189 | static void | |
6190 | keep_going (struct execution_control_state *ecs) | |
6191 | { | |
c4dbc9af PA |
6192 | /* Make sure normal_stop is called if we get a QUIT handled before |
6193 | reaching resume. */ | |
6194 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
6195 | ||
d4f3574e | 6196 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
6197 | ecs->event_thread->prev_pc |
6198 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 6199 | |
16c381f0 | 6200 | if (ecs->event_thread->control.trap_expected |
a493e3e2 | 6201 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) |
d4f3574e | 6202 | { |
a9ba6bae PA |
6203 | /* We haven't yet gotten our trap, and either: intercepted a |
6204 | non-signal event (e.g., a fork); or took a signal which we | |
6205 | are supposed to pass through to the inferior. Simply | |
6206 | continue. */ | |
c4dbc9af | 6207 | discard_cleanups (old_cleanups); |
64ce06e4 | 6208 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
6209 | } |
6210 | else | |
6211 | { | |
31e77af2 | 6212 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
6213 | int remove_bp; |
6214 | int remove_wps; | |
31e77af2 | 6215 | |
d4f3574e | 6216 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
6217 | anyway (if we got a signal, the user asked it be passed to |
6218 | the child) | |
6219 | -- or -- | |
6220 | We got our expected trap, but decided we should resume from | |
6221 | it. | |
d4f3574e | 6222 | |
a9ba6bae | 6223 | We're going to run this baby now! |
d4f3574e | 6224 | |
c36b740a VP |
6225 | Note that insert_breakpoints won't try to re-insert |
6226 | already inserted breakpoints. Therefore, we don't | |
6227 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 6228 | |
31e77af2 PA |
6229 | /* If we need to step over a breakpoint, and we're not using |
6230 | displaced stepping to do so, insert all breakpoints | |
6231 | (watchpoints, etc.) but the one we're stepping over, step one | |
6232 | instruction, and then re-insert the breakpoint when that step | |
6233 | is finished. */ | |
963f9c80 PA |
6234 | |
6235 | remove_bp = (ecs->hit_singlestep_breakpoint | |
6236 | || thread_still_needs_step_over (ecs->event_thread)); | |
6237 | remove_wps = (ecs->event_thread->stepping_over_watchpoint | |
6238 | && !target_have_steppable_watchpoint); | |
6239 | ||
6240 | if (remove_bp && !use_displaced_stepping (get_regcache_arch (regcache))) | |
45e8c884 | 6241 | { |
31e77af2 | 6242 | set_step_over_info (get_regcache_aspace (regcache), |
963f9c80 | 6243 | regcache_read_pc (regcache), remove_wps); |
45e8c884 | 6244 | } |
963f9c80 PA |
6245 | else if (remove_wps) |
6246 | set_step_over_info (NULL, 0, remove_wps); | |
45e8c884 | 6247 | else |
31e77af2 | 6248 | clear_step_over_info (); |
abbb1732 | 6249 | |
31e77af2 | 6250 | /* Stop stepping if inserting breakpoints fails. */ |
492d29ea | 6251 | TRY |
31e77af2 PA |
6252 | { |
6253 | insert_breakpoints (); | |
6254 | } | |
492d29ea | 6255 | CATCH (e, RETURN_MASK_ERROR) |
31e77af2 PA |
6256 | { |
6257 | exception_print (gdb_stderr, e); | |
22bcd14b | 6258 | stop_waiting (ecs); |
31e77af2 | 6259 | return; |
d4f3574e | 6260 | } |
492d29ea | 6261 | END_CATCH |
d4f3574e | 6262 | |
963f9c80 | 6263 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 6264 | |
a9ba6bae PA |
6265 | /* Do not deliver GDB_SIGNAL_TRAP (except when the user |
6266 | explicitly specifies that such a signal should be delivered | |
6267 | to the target program). Typically, that would occur when a | |
6268 | user is debugging a target monitor on a simulator: the target | |
6269 | monitor sets a breakpoint; the simulator encounters this | |
6270 | breakpoint and halts the simulation handing control to GDB; | |
6271 | GDB, noting that the stop address doesn't map to any known | |
6272 | breakpoint, returns control back to the simulator; the | |
6273 | simulator then delivers the hardware equivalent of a | |
6274 | GDB_SIGNAL_TRAP to the program being debugged. */ | |
a493e3e2 | 6275 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 6276 | && !signal_program[ecs->event_thread->suspend.stop_signal]) |
a493e3e2 | 6277 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
d4f3574e | 6278 | |
c4dbc9af | 6279 | discard_cleanups (old_cleanups); |
64ce06e4 | 6280 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
6281 | } |
6282 | ||
488f131b | 6283 | prepare_to_wait (ecs); |
d4f3574e SS |
6284 | } |
6285 | ||
104c1213 JM |
6286 | /* This function normally comes after a resume, before |
6287 | handle_inferior_event exits. It takes care of any last bits of | |
6288 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 6289 | |
104c1213 JM |
6290 | static void |
6291 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 6292 | { |
527159b7 | 6293 | if (debug_infrun) |
8a9de0e4 | 6294 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 6295 | |
104c1213 JM |
6296 | /* This is the old end of the while loop. Let everybody know we |
6297 | want to wait for the inferior some more and get called again | |
6298 | soon. */ | |
6299 | ecs->wait_some_more = 1; | |
c906108c | 6300 | } |
11cf8741 | 6301 | |
fd664c91 | 6302 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 6303 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
6304 | |
6305 | static void | |
bdc36728 | 6306 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 6307 | { |
bdc36728 | 6308 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 6309 | stop_waiting (ecs); |
fd664c91 PA |
6310 | } |
6311 | ||
33d62d64 JK |
6312 | /* Several print_*_reason functions to print why the inferior has stopped. |
6313 | We always print something when the inferior exits, or receives a signal. | |
6314 | The rest of the cases are dealt with later on in normal_stop and | |
6315 | print_it_typical. Ideally there should be a call to one of these | |
6316 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 6317 | stop_waiting is called. |
33d62d64 | 6318 | |
fd664c91 PA |
6319 | Note that we don't call these directly, instead we delegate that to |
6320 | the interpreters, through observers. Interpreters then call these | |
6321 | with whatever uiout is right. */ | |
33d62d64 | 6322 | |
fd664c91 PA |
6323 | void |
6324 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 6325 | { |
fd664c91 | 6326 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 6327 | |
fd664c91 PA |
6328 | if (ui_out_is_mi_like_p (uiout)) |
6329 | { | |
6330 | ui_out_field_string (uiout, "reason", | |
6331 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
6332 | } | |
6333 | } | |
33d62d64 | 6334 | |
fd664c91 PA |
6335 | void |
6336 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 6337 | { |
33d62d64 JK |
6338 | annotate_signalled (); |
6339 | if (ui_out_is_mi_like_p (uiout)) | |
6340 | ui_out_field_string | |
6341 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
6342 | ui_out_text (uiout, "\nProgram terminated with signal "); | |
6343 | annotate_signal_name (); | |
6344 | ui_out_field_string (uiout, "signal-name", | |
2ea28649 | 6345 | gdb_signal_to_name (siggnal)); |
33d62d64 JK |
6346 | annotate_signal_name_end (); |
6347 | ui_out_text (uiout, ", "); | |
6348 | annotate_signal_string (); | |
6349 | ui_out_field_string (uiout, "signal-meaning", | |
2ea28649 | 6350 | gdb_signal_to_string (siggnal)); |
33d62d64 JK |
6351 | annotate_signal_string_end (); |
6352 | ui_out_text (uiout, ".\n"); | |
6353 | ui_out_text (uiout, "The program no longer exists.\n"); | |
6354 | } | |
6355 | ||
fd664c91 PA |
6356 | void |
6357 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 6358 | { |
fda326dd TT |
6359 | struct inferior *inf = current_inferior (); |
6360 | const char *pidstr = target_pid_to_str (pid_to_ptid (inf->pid)); | |
6361 | ||
33d62d64 JK |
6362 | annotate_exited (exitstatus); |
6363 | if (exitstatus) | |
6364 | { | |
6365 | if (ui_out_is_mi_like_p (uiout)) | |
6366 | ui_out_field_string (uiout, "reason", | |
6367 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
fda326dd TT |
6368 | ui_out_text (uiout, "[Inferior "); |
6369 | ui_out_text (uiout, plongest (inf->num)); | |
6370 | ui_out_text (uiout, " ("); | |
6371 | ui_out_text (uiout, pidstr); | |
6372 | ui_out_text (uiout, ") exited with code "); | |
33d62d64 | 6373 | ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) exitstatus); |
fda326dd | 6374 | ui_out_text (uiout, "]\n"); |
33d62d64 JK |
6375 | } |
6376 | else | |
11cf8741 | 6377 | { |
9dc5e2a9 | 6378 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f | 6379 | ui_out_field_string |
33d62d64 | 6380 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); |
fda326dd TT |
6381 | ui_out_text (uiout, "[Inferior "); |
6382 | ui_out_text (uiout, plongest (inf->num)); | |
6383 | ui_out_text (uiout, " ("); | |
6384 | ui_out_text (uiout, pidstr); | |
6385 | ui_out_text (uiout, ") exited normally]\n"); | |
33d62d64 | 6386 | } |
33d62d64 JK |
6387 | } |
6388 | ||
fd664c91 PA |
6389 | void |
6390 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 JK |
6391 | { |
6392 | annotate_signal (); | |
6393 | ||
a493e3e2 | 6394 | if (siggnal == GDB_SIGNAL_0 && !ui_out_is_mi_like_p (uiout)) |
33d62d64 JK |
6395 | { |
6396 | struct thread_info *t = inferior_thread (); | |
6397 | ||
6398 | ui_out_text (uiout, "\n["); | |
6399 | ui_out_field_string (uiout, "thread-name", | |
6400 | target_pid_to_str (t->ptid)); | |
6401 | ui_out_field_fmt (uiout, "thread-id", "] #%d", t->num); | |
6402 | ui_out_text (uiout, " stopped"); | |
6403 | } | |
6404 | else | |
6405 | { | |
6406 | ui_out_text (uiout, "\nProgram received signal "); | |
8b93c638 | 6407 | annotate_signal_name (); |
33d62d64 JK |
6408 | if (ui_out_is_mi_like_p (uiout)) |
6409 | ui_out_field_string | |
6410 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b | 6411 | ui_out_field_string (uiout, "signal-name", |
2ea28649 | 6412 | gdb_signal_to_name (siggnal)); |
8b93c638 JM |
6413 | annotate_signal_name_end (); |
6414 | ui_out_text (uiout, ", "); | |
6415 | annotate_signal_string (); | |
488f131b | 6416 | ui_out_field_string (uiout, "signal-meaning", |
2ea28649 | 6417 | gdb_signal_to_string (siggnal)); |
8b93c638 | 6418 | annotate_signal_string_end (); |
33d62d64 JK |
6419 | } |
6420 | ui_out_text (uiout, ".\n"); | |
6421 | } | |
252fbfc8 | 6422 | |
fd664c91 PA |
6423 | void |
6424 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 6425 | { |
fd664c91 | 6426 | ui_out_text (uiout, "\nNo more reverse-execution history.\n"); |
11cf8741 | 6427 | } |
43ff13b4 | 6428 | |
0c7e1a46 PA |
6429 | /* Print current location without a level number, if we have changed |
6430 | functions or hit a breakpoint. Print source line if we have one. | |
6431 | bpstat_print contains the logic deciding in detail what to print, | |
6432 | based on the event(s) that just occurred. */ | |
6433 | ||
6434 | void | |
6435 | print_stop_event (struct target_waitstatus *ws) | |
6436 | { | |
6437 | int bpstat_ret; | |
6438 | int source_flag; | |
6439 | int do_frame_printing = 1; | |
6440 | struct thread_info *tp = inferior_thread (); | |
6441 | ||
6442 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
6443 | switch (bpstat_ret) | |
6444 | { | |
6445 | case PRINT_UNKNOWN: | |
6446 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
6447 | should) carry around the function and does (or should) use | |
6448 | that when doing a frame comparison. */ | |
6449 | if (tp->control.stop_step | |
6450 | && frame_id_eq (tp->control.step_frame_id, | |
6451 | get_frame_id (get_current_frame ())) | |
885eeb5b | 6452 | && tp->control.step_start_function == find_pc_function (stop_pc)) |
0c7e1a46 PA |
6453 | { |
6454 | /* Finished step, just print source line. */ | |
6455 | source_flag = SRC_LINE; | |
6456 | } | |
6457 | else | |
6458 | { | |
6459 | /* Print location and source line. */ | |
6460 | source_flag = SRC_AND_LOC; | |
6461 | } | |
6462 | break; | |
6463 | case PRINT_SRC_AND_LOC: | |
6464 | /* Print location and source line. */ | |
6465 | source_flag = SRC_AND_LOC; | |
6466 | break; | |
6467 | case PRINT_SRC_ONLY: | |
6468 | source_flag = SRC_LINE; | |
6469 | break; | |
6470 | case PRINT_NOTHING: | |
6471 | /* Something bogus. */ | |
6472 | source_flag = SRC_LINE; | |
6473 | do_frame_printing = 0; | |
6474 | break; | |
6475 | default: | |
6476 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
6477 | } | |
6478 | ||
6479 | /* The behavior of this routine with respect to the source | |
6480 | flag is: | |
6481 | SRC_LINE: Print only source line | |
6482 | LOCATION: Print only location | |
6483 | SRC_AND_LOC: Print location and source line. */ | |
6484 | if (do_frame_printing) | |
6485 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
6486 | ||
6487 | /* Display the auto-display expressions. */ | |
6488 | do_displays (); | |
6489 | } | |
6490 | ||
c906108c SS |
6491 | /* Here to return control to GDB when the inferior stops for real. |
6492 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
6493 | ||
6494 | STOP_PRINT_FRAME nonzero means print the executing frame | |
6495 | (pc, function, args, file, line number and line text). | |
6496 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
6497 | attempting to insert breakpoints. */ | |
6498 | ||
6499 | void | |
96baa820 | 6500 | normal_stop (void) |
c906108c | 6501 | { |
73b65bb0 DJ |
6502 | struct target_waitstatus last; |
6503 | ptid_t last_ptid; | |
29f49a6a | 6504 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
73b65bb0 DJ |
6505 | |
6506 | get_last_target_status (&last_ptid, &last); | |
6507 | ||
29f49a6a PA |
6508 | /* If an exception is thrown from this point on, make sure to |
6509 | propagate GDB's knowledge of the executing state to the | |
6510 | frontend/user running state. A QUIT is an easy exception to see | |
6511 | here, so do this before any filtered output. */ | |
c35b1492 PA |
6512 | if (!non_stop) |
6513 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
6514 | else if (last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
6515 | && last.kind != TARGET_WAITKIND_EXITED |
6516 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c35b1492 | 6517 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); |
29f49a6a | 6518 | |
b57bacec PA |
6519 | /* As we're presenting a stop, and potentially removing breakpoints, |
6520 | update the thread list so we can tell whether there are threads | |
6521 | running on the target. With target remote, for example, we can | |
6522 | only learn about new threads when we explicitly update the thread | |
6523 | list. Do this before notifying the interpreters about signal | |
6524 | stops, end of stepping ranges, etc., so that the "new thread" | |
6525 | output is emitted before e.g., "Program received signal FOO", | |
6526 | instead of after. */ | |
6527 | update_thread_list (); | |
6528 | ||
6529 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
6530 | observer_notify_signal_received (inferior_thread ()->suspend.stop_signal); | |
6531 | ||
c906108c SS |
6532 | /* As with the notification of thread events, we want to delay |
6533 | notifying the user that we've switched thread context until | |
6534 | the inferior actually stops. | |
6535 | ||
73b65bb0 DJ |
6536 | There's no point in saying anything if the inferior has exited. |
6537 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
6538 | "received a signal". |
6539 | ||
6540 | Also skip saying anything in non-stop mode. In that mode, as we | |
6541 | don't want GDB to switch threads behind the user's back, to avoid | |
6542 | races where the user is typing a command to apply to thread x, | |
6543 | but GDB switches to thread y before the user finishes entering | |
6544 | the command, fetch_inferior_event installs a cleanup to restore | |
6545 | the current thread back to the thread the user had selected right | |
6546 | after this event is handled, so we're not really switching, only | |
6547 | informing of a stop. */ | |
4f8d22e3 PA |
6548 | if (!non_stop |
6549 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
6550 | && target_has_execution |
6551 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
6552 | && last.kind != TARGET_WAITKIND_EXITED |
6553 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c SS |
6554 | { |
6555 | target_terminal_ours_for_output (); | |
a3f17187 | 6556 | printf_filtered (_("[Switching to %s]\n"), |
c95310c6 | 6557 | target_pid_to_str (inferior_ptid)); |
b8fa951a | 6558 | annotate_thread_changed (); |
39f77062 | 6559 | previous_inferior_ptid = inferior_ptid; |
c906108c | 6560 | } |
c906108c | 6561 | |
0e5bf2a8 PA |
6562 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
6563 | { | |
6564 | gdb_assert (sync_execution || !target_can_async_p ()); | |
6565 | ||
6566 | target_terminal_ours_for_output (); | |
6567 | printf_filtered (_("No unwaited-for children left.\n")); | |
6568 | } | |
6569 | ||
b57bacec | 6570 | /* Note: this depends on the update_thread_list call above. */ |
a25a5a45 | 6571 | if (!breakpoints_should_be_inserted_now () && target_has_execution) |
c906108c SS |
6572 | { |
6573 | if (remove_breakpoints ()) | |
6574 | { | |
6575 | target_terminal_ours_for_output (); | |
3e43a32a MS |
6576 | printf_filtered (_("Cannot remove breakpoints because " |
6577 | "program is no longer writable.\nFurther " | |
6578 | "execution is probably impossible.\n")); | |
c906108c SS |
6579 | } |
6580 | } | |
c906108c | 6581 | |
c906108c SS |
6582 | /* If an auto-display called a function and that got a signal, |
6583 | delete that auto-display to avoid an infinite recursion. */ | |
6584 | ||
6585 | if (stopped_by_random_signal) | |
6586 | disable_current_display (); | |
6587 | ||
b57bacec | 6588 | /* Notify observers if we finished a "step"-like command, etc. */ |
af679fd0 PA |
6589 | if (target_has_execution |
6590 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
6591 | && last.kind != TARGET_WAITKIND_EXITED | |
16c381f0 | 6592 | && inferior_thread ()->control.stop_step) |
b57bacec | 6593 | { |
31cc0b80 | 6594 | /* But not if in the middle of doing a "step n" operation for |
b57bacec PA |
6595 | n > 1 */ |
6596 | if (inferior_thread ()->step_multi) | |
6597 | goto done; | |
6598 | ||
6599 | observer_notify_end_stepping_range (); | |
6600 | } | |
c906108c SS |
6601 | |
6602 | target_terminal_ours (); | |
0f641c01 | 6603 | async_enable_stdin (); |
c906108c | 6604 | |
7abfe014 DJ |
6605 | /* Set the current source location. This will also happen if we |
6606 | display the frame below, but the current SAL will be incorrect | |
6607 | during a user hook-stop function. */ | |
d729566a | 6608 | if (has_stack_frames () && !stop_stack_dummy) |
5166082f | 6609 | set_current_sal_from_frame (get_current_frame ()); |
7abfe014 | 6610 | |
251bde03 PA |
6611 | /* Let the user/frontend see the threads as stopped, but do nothing |
6612 | if the thread was running an infcall. We may be e.g., evaluating | |
6613 | a breakpoint condition. In that case, the thread had state | |
6614 | THREAD_RUNNING before the infcall, and shall remain set to | |
6615 | running, all without informing the user/frontend about state | |
6616 | transition changes. If this is actually a call command, then the | |
6617 | thread was originally already stopped, so there's no state to | |
6618 | finish either. */ | |
6619 | if (target_has_execution && inferior_thread ()->control.in_infcall) | |
6620 | discard_cleanups (old_chain); | |
6621 | else | |
6622 | do_cleanups (old_chain); | |
dd7e2d2b PA |
6623 | |
6624 | /* Look up the hook_stop and run it (CLI internally handles problem | |
6625 | of stop_command's pre-hook not existing). */ | |
6626 | if (stop_command) | |
6627 | catch_errors (hook_stop_stub, stop_command, | |
6628 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
6629 | ||
d729566a | 6630 | if (!has_stack_frames ()) |
d51fd4c8 | 6631 | goto done; |
c906108c | 6632 | |
32400beb PA |
6633 | if (last.kind == TARGET_WAITKIND_SIGNALLED |
6634 | || last.kind == TARGET_WAITKIND_EXITED) | |
6635 | goto done; | |
6636 | ||
c906108c SS |
6637 | /* Select innermost stack frame - i.e., current frame is frame 0, |
6638 | and current location is based on that. | |
6639 | Don't do this on return from a stack dummy routine, | |
1777feb0 | 6640 | or if the program has exited. */ |
c906108c SS |
6641 | |
6642 | if (!stop_stack_dummy) | |
6643 | { | |
0f7d239c | 6644 | select_frame (get_current_frame ()); |
c906108c | 6645 | |
d01a8610 AS |
6646 | /* If --batch-silent is enabled then there's no need to print the current |
6647 | source location, and to try risks causing an error message about | |
6648 | missing source files. */ | |
6649 | if (stop_print_frame && !batch_silent) | |
0c7e1a46 | 6650 | print_stop_event (&last); |
c906108c SS |
6651 | } |
6652 | ||
6653 | /* Save the function value return registers, if we care. | |
6654 | We might be about to restore their previous contents. */ | |
9da8c2a0 PA |
6655 | if (inferior_thread ()->control.proceed_to_finish |
6656 | && execution_direction != EXEC_REVERSE) | |
d5c31457 UW |
6657 | { |
6658 | /* This should not be necessary. */ | |
6659 | if (stop_registers) | |
6660 | regcache_xfree (stop_registers); | |
6661 | ||
6662 | /* NB: The copy goes through to the target picking up the value of | |
6663 | all the registers. */ | |
6664 | stop_registers = regcache_dup (get_current_regcache ()); | |
6665 | } | |
c906108c | 6666 | |
aa7d318d | 6667 | if (stop_stack_dummy == STOP_STACK_DUMMY) |
c906108c | 6668 | { |
b89667eb DE |
6669 | /* Pop the empty frame that contains the stack dummy. |
6670 | This also restores inferior state prior to the call | |
16c381f0 | 6671 | (struct infcall_suspend_state). */ |
b89667eb | 6672 | struct frame_info *frame = get_current_frame (); |
abbb1732 | 6673 | |
b89667eb DE |
6674 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); |
6675 | frame_pop (frame); | |
3e43a32a MS |
6676 | /* frame_pop() calls reinit_frame_cache as the last thing it |
6677 | does which means there's currently no selected frame. We | |
6678 | don't need to re-establish a selected frame if the dummy call | |
6679 | returns normally, that will be done by | |
6680 | restore_infcall_control_state. However, we do have to handle | |
6681 | the case where the dummy call is returning after being | |
6682 | stopped (e.g. the dummy call previously hit a breakpoint). | |
6683 | We can't know which case we have so just always re-establish | |
6684 | a selected frame here. */ | |
0f7d239c | 6685 | select_frame (get_current_frame ()); |
c906108c SS |
6686 | } |
6687 | ||
c906108c SS |
6688 | done: |
6689 | annotate_stopped (); | |
41d2bdb4 PA |
6690 | |
6691 | /* Suppress the stop observer if we're in the middle of: | |
6692 | ||
6693 | - a step n (n > 1), as there still more steps to be done. | |
6694 | ||
6695 | - a "finish" command, as the observer will be called in | |
6696 | finish_command_continuation, so it can include the inferior | |
6697 | function's return value. | |
6698 | ||
6699 | - calling an inferior function, as we pretend we inferior didn't | |
6700 | run at all. The return value of the call is handled by the | |
6701 | expression evaluator, through call_function_by_hand. */ | |
6702 | ||
6703 | if (!target_has_execution | |
6704 | || last.kind == TARGET_WAITKIND_SIGNALLED | |
6705 | || last.kind == TARGET_WAITKIND_EXITED | |
0e5bf2a8 | 6706 | || last.kind == TARGET_WAITKIND_NO_RESUMED |
2ca0b532 PA |
6707 | || (!(inferior_thread ()->step_multi |
6708 | && inferior_thread ()->control.stop_step) | |
16c381f0 JK |
6709 | && !(inferior_thread ()->control.stop_bpstat |
6710 | && inferior_thread ()->control.proceed_to_finish) | |
6711 | && !inferior_thread ()->control.in_infcall)) | |
347bddb7 PA |
6712 | { |
6713 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
16c381f0 | 6714 | observer_notify_normal_stop (inferior_thread ()->control.stop_bpstat, |
1d33d6ba | 6715 | stop_print_frame); |
347bddb7 | 6716 | else |
1d33d6ba | 6717 | observer_notify_normal_stop (NULL, stop_print_frame); |
347bddb7 | 6718 | } |
347bddb7 | 6719 | |
48844aa6 PA |
6720 | if (target_has_execution) |
6721 | { | |
6722 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
6723 | && last.kind != TARGET_WAITKIND_EXITED) | |
6724 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
6725 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 6726 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 6727 | } |
6c95b8df PA |
6728 | |
6729 | /* Try to get rid of automatically added inferiors that are no | |
6730 | longer needed. Keeping those around slows down things linearly. | |
6731 | Note that this never removes the current inferior. */ | |
6732 | prune_inferiors (); | |
c906108c SS |
6733 | } |
6734 | ||
6735 | static int | |
96baa820 | 6736 | hook_stop_stub (void *cmd) |
c906108c | 6737 | { |
5913bcb0 | 6738 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
6739 | return (0); |
6740 | } | |
6741 | \f | |
c5aa993b | 6742 | int |
96baa820 | 6743 | signal_stop_state (int signo) |
c906108c | 6744 | { |
d6b48e9c | 6745 | return signal_stop[signo]; |
c906108c SS |
6746 | } |
6747 | ||
c5aa993b | 6748 | int |
96baa820 | 6749 | signal_print_state (int signo) |
c906108c SS |
6750 | { |
6751 | return signal_print[signo]; | |
6752 | } | |
6753 | ||
c5aa993b | 6754 | int |
96baa820 | 6755 | signal_pass_state (int signo) |
c906108c SS |
6756 | { |
6757 | return signal_program[signo]; | |
6758 | } | |
6759 | ||
2455069d UW |
6760 | static void |
6761 | signal_cache_update (int signo) | |
6762 | { | |
6763 | if (signo == -1) | |
6764 | { | |
a493e3e2 | 6765 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
6766 | signal_cache_update (signo); |
6767 | ||
6768 | return; | |
6769 | } | |
6770 | ||
6771 | signal_pass[signo] = (signal_stop[signo] == 0 | |
6772 | && signal_print[signo] == 0 | |
ab04a2af TT |
6773 | && signal_program[signo] == 1 |
6774 | && signal_catch[signo] == 0); | |
2455069d UW |
6775 | } |
6776 | ||
488f131b | 6777 | int |
7bda5e4a | 6778 | signal_stop_update (int signo, int state) |
d4f3574e SS |
6779 | { |
6780 | int ret = signal_stop[signo]; | |
abbb1732 | 6781 | |
d4f3574e | 6782 | signal_stop[signo] = state; |
2455069d | 6783 | signal_cache_update (signo); |
d4f3574e SS |
6784 | return ret; |
6785 | } | |
6786 | ||
488f131b | 6787 | int |
7bda5e4a | 6788 | signal_print_update (int signo, int state) |
d4f3574e SS |
6789 | { |
6790 | int ret = signal_print[signo]; | |
abbb1732 | 6791 | |
d4f3574e | 6792 | signal_print[signo] = state; |
2455069d | 6793 | signal_cache_update (signo); |
d4f3574e SS |
6794 | return ret; |
6795 | } | |
6796 | ||
488f131b | 6797 | int |
7bda5e4a | 6798 | signal_pass_update (int signo, int state) |
d4f3574e SS |
6799 | { |
6800 | int ret = signal_program[signo]; | |
abbb1732 | 6801 | |
d4f3574e | 6802 | signal_program[signo] = state; |
2455069d | 6803 | signal_cache_update (signo); |
d4f3574e SS |
6804 | return ret; |
6805 | } | |
6806 | ||
ab04a2af TT |
6807 | /* Update the global 'signal_catch' from INFO and notify the |
6808 | target. */ | |
6809 | ||
6810 | void | |
6811 | signal_catch_update (const unsigned int *info) | |
6812 | { | |
6813 | int i; | |
6814 | ||
6815 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
6816 | signal_catch[i] = info[i] > 0; | |
6817 | signal_cache_update (-1); | |
6818 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
6819 | } | |
6820 | ||
c906108c | 6821 | static void |
96baa820 | 6822 | sig_print_header (void) |
c906108c | 6823 | { |
3e43a32a MS |
6824 | printf_filtered (_("Signal Stop\tPrint\tPass " |
6825 | "to program\tDescription\n")); | |
c906108c SS |
6826 | } |
6827 | ||
6828 | static void | |
2ea28649 | 6829 | sig_print_info (enum gdb_signal oursig) |
c906108c | 6830 | { |
2ea28649 | 6831 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 6832 | int name_padding = 13 - strlen (name); |
96baa820 | 6833 | |
c906108c SS |
6834 | if (name_padding <= 0) |
6835 | name_padding = 0; | |
6836 | ||
6837 | printf_filtered ("%s", name); | |
488f131b | 6838 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
6839 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
6840 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
6841 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 6842 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
6843 | } |
6844 | ||
6845 | /* Specify how various signals in the inferior should be handled. */ | |
6846 | ||
6847 | static void | |
96baa820 | 6848 | handle_command (char *args, int from_tty) |
c906108c SS |
6849 | { |
6850 | char **argv; | |
6851 | int digits, wordlen; | |
6852 | int sigfirst, signum, siglast; | |
2ea28649 | 6853 | enum gdb_signal oursig; |
c906108c SS |
6854 | int allsigs; |
6855 | int nsigs; | |
6856 | unsigned char *sigs; | |
6857 | struct cleanup *old_chain; | |
6858 | ||
6859 | if (args == NULL) | |
6860 | { | |
e2e0b3e5 | 6861 | error_no_arg (_("signal to handle")); |
c906108c SS |
6862 | } |
6863 | ||
1777feb0 | 6864 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 6865 | |
a493e3e2 | 6866 | nsigs = (int) GDB_SIGNAL_LAST; |
c906108c SS |
6867 | sigs = (unsigned char *) alloca (nsigs); |
6868 | memset (sigs, 0, nsigs); | |
6869 | ||
1777feb0 | 6870 | /* Break the command line up into args. */ |
c906108c | 6871 | |
d1a41061 | 6872 | argv = gdb_buildargv (args); |
7a292a7a | 6873 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
6874 | |
6875 | /* Walk through the args, looking for signal oursigs, signal names, and | |
6876 | actions. Signal numbers and signal names may be interspersed with | |
6877 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 6878 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c SS |
6879 | |
6880 | while (*argv != NULL) | |
6881 | { | |
6882 | wordlen = strlen (*argv); | |
6883 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
6884 | {; | |
6885 | } | |
6886 | allsigs = 0; | |
6887 | sigfirst = siglast = -1; | |
6888 | ||
6889 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
6890 | { | |
6891 | /* Apply action to all signals except those used by the | |
1777feb0 | 6892 | debugger. Silently skip those. */ |
c906108c SS |
6893 | allsigs = 1; |
6894 | sigfirst = 0; | |
6895 | siglast = nsigs - 1; | |
6896 | } | |
6897 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
6898 | { | |
6899 | SET_SIGS (nsigs, sigs, signal_stop); | |
6900 | SET_SIGS (nsigs, sigs, signal_print); | |
6901 | } | |
6902 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
6903 | { | |
6904 | UNSET_SIGS (nsigs, sigs, signal_program); | |
6905 | } | |
6906 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
6907 | { | |
6908 | SET_SIGS (nsigs, sigs, signal_print); | |
6909 | } | |
6910 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
6911 | { | |
6912 | SET_SIGS (nsigs, sigs, signal_program); | |
6913 | } | |
6914 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
6915 | { | |
6916 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
6917 | } | |
6918 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
6919 | { | |
6920 | SET_SIGS (nsigs, sigs, signal_program); | |
6921 | } | |
6922 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
6923 | { | |
6924 | UNSET_SIGS (nsigs, sigs, signal_print); | |
6925 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
6926 | } | |
6927 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
6928 | { | |
6929 | UNSET_SIGS (nsigs, sigs, signal_program); | |
6930 | } | |
6931 | else if (digits > 0) | |
6932 | { | |
6933 | /* It is numeric. The numeric signal refers to our own | |
6934 | internal signal numbering from target.h, not to host/target | |
6935 | signal number. This is a feature; users really should be | |
6936 | using symbolic names anyway, and the common ones like | |
6937 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
6938 | ||
6939 | sigfirst = siglast = (int) | |
2ea28649 | 6940 | gdb_signal_from_command (atoi (*argv)); |
c906108c SS |
6941 | if ((*argv)[digits] == '-') |
6942 | { | |
6943 | siglast = (int) | |
2ea28649 | 6944 | gdb_signal_from_command (atoi ((*argv) + digits + 1)); |
c906108c SS |
6945 | } |
6946 | if (sigfirst > siglast) | |
6947 | { | |
1777feb0 | 6948 | /* Bet he didn't figure we'd think of this case... */ |
c906108c SS |
6949 | signum = sigfirst; |
6950 | sigfirst = siglast; | |
6951 | siglast = signum; | |
6952 | } | |
6953 | } | |
6954 | else | |
6955 | { | |
2ea28649 | 6956 | oursig = gdb_signal_from_name (*argv); |
a493e3e2 | 6957 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
6958 | { |
6959 | sigfirst = siglast = (int) oursig; | |
6960 | } | |
6961 | else | |
6962 | { | |
6963 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 6964 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
6965 | } |
6966 | } | |
6967 | ||
6968 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 6969 | which signals to apply actions to. */ |
c906108c SS |
6970 | |
6971 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
6972 | { | |
2ea28649 | 6973 | switch ((enum gdb_signal) signum) |
c906108c | 6974 | { |
a493e3e2 PA |
6975 | case GDB_SIGNAL_TRAP: |
6976 | case GDB_SIGNAL_INT: | |
c906108c SS |
6977 | if (!allsigs && !sigs[signum]) |
6978 | { | |
9e2f0ad4 | 6979 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 6980 | Are you sure you want to change it? "), |
2ea28649 | 6981 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
6982 | { |
6983 | sigs[signum] = 1; | |
6984 | } | |
6985 | else | |
6986 | { | |
a3f17187 | 6987 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
6988 | gdb_flush (gdb_stdout); |
6989 | } | |
6990 | } | |
6991 | break; | |
a493e3e2 PA |
6992 | case GDB_SIGNAL_0: |
6993 | case GDB_SIGNAL_DEFAULT: | |
6994 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
6995 | /* Make sure that "all" doesn't print these. */ |
6996 | break; | |
6997 | default: | |
6998 | sigs[signum] = 1; | |
6999 | break; | |
7000 | } | |
7001 | } | |
7002 | ||
7003 | argv++; | |
7004 | } | |
7005 | ||
3a031f65 PA |
7006 | for (signum = 0; signum < nsigs; signum++) |
7007 | if (sigs[signum]) | |
7008 | { | |
2455069d | 7009 | signal_cache_update (-1); |
a493e3e2 PA |
7010 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); |
7011 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); | |
c906108c | 7012 | |
3a031f65 PA |
7013 | if (from_tty) |
7014 | { | |
7015 | /* Show the results. */ | |
7016 | sig_print_header (); | |
7017 | for (; signum < nsigs; signum++) | |
7018 | if (sigs[signum]) | |
7019 | sig_print_info (signum); | |
7020 | } | |
7021 | ||
7022 | break; | |
7023 | } | |
c906108c SS |
7024 | |
7025 | do_cleanups (old_chain); | |
7026 | } | |
7027 | ||
de0bea00 MF |
7028 | /* Complete the "handle" command. */ |
7029 | ||
7030 | static VEC (char_ptr) * | |
7031 | handle_completer (struct cmd_list_element *ignore, | |
6f937416 | 7032 | const char *text, const char *word) |
de0bea00 MF |
7033 | { |
7034 | VEC (char_ptr) *vec_signals, *vec_keywords, *return_val; | |
7035 | static const char * const keywords[] = | |
7036 | { | |
7037 | "all", | |
7038 | "stop", | |
7039 | "ignore", | |
7040 | "print", | |
7041 | "pass", | |
7042 | "nostop", | |
7043 | "noignore", | |
7044 | "noprint", | |
7045 | "nopass", | |
7046 | NULL, | |
7047 | }; | |
7048 | ||
7049 | vec_signals = signal_completer (ignore, text, word); | |
7050 | vec_keywords = complete_on_enum (keywords, word, word); | |
7051 | ||
7052 | return_val = VEC_merge (char_ptr, vec_signals, vec_keywords); | |
7053 | VEC_free (char_ptr, vec_signals); | |
7054 | VEC_free (char_ptr, vec_keywords); | |
7055 | return return_val; | |
7056 | } | |
7057 | ||
c906108c | 7058 | static void |
96baa820 | 7059 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
7060 | { |
7061 | char **argv; | |
7062 | struct cleanup *old_chain; | |
7063 | ||
d1a41061 PP |
7064 | if (args == NULL) |
7065 | error_no_arg (_("xdb command")); | |
7066 | ||
1777feb0 | 7067 | /* Break the command line up into args. */ |
c906108c | 7068 | |
d1a41061 | 7069 | argv = gdb_buildargv (args); |
7a292a7a | 7070 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
7071 | if (argv[1] != (char *) NULL) |
7072 | { | |
7073 | char *argBuf; | |
7074 | int bufLen; | |
7075 | ||
7076 | bufLen = strlen (argv[0]) + 20; | |
7077 | argBuf = (char *) xmalloc (bufLen); | |
7078 | if (argBuf) | |
7079 | { | |
7080 | int validFlag = 1; | |
2ea28649 | 7081 | enum gdb_signal oursig; |
c906108c | 7082 | |
2ea28649 | 7083 | oursig = gdb_signal_from_name (argv[0]); |
c906108c SS |
7084 | memset (argBuf, 0, bufLen); |
7085 | if (strcmp (argv[1], "Q") == 0) | |
7086 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
7087 | else | |
7088 | { | |
7089 | if (strcmp (argv[1], "s") == 0) | |
7090 | { | |
7091 | if (!signal_stop[oursig]) | |
7092 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
7093 | else | |
7094 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
7095 | } | |
7096 | else if (strcmp (argv[1], "i") == 0) | |
7097 | { | |
7098 | if (!signal_program[oursig]) | |
7099 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
7100 | else | |
7101 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
7102 | } | |
7103 | else if (strcmp (argv[1], "r") == 0) | |
7104 | { | |
7105 | if (!signal_print[oursig]) | |
7106 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
7107 | else | |
7108 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
7109 | } | |
7110 | else | |
7111 | validFlag = 0; | |
7112 | } | |
7113 | if (validFlag) | |
7114 | handle_command (argBuf, from_tty); | |
7115 | else | |
a3f17187 | 7116 | printf_filtered (_("Invalid signal handling flag.\n")); |
c906108c | 7117 | if (argBuf) |
b8c9b27d | 7118 | xfree (argBuf); |
c906108c SS |
7119 | } |
7120 | } | |
7121 | do_cleanups (old_chain); | |
7122 | } | |
7123 | ||
2ea28649 PA |
7124 | enum gdb_signal |
7125 | gdb_signal_from_command (int num) | |
ed01b82c PA |
7126 | { |
7127 | if (num >= 1 && num <= 15) | |
2ea28649 | 7128 | return (enum gdb_signal) num; |
ed01b82c PA |
7129 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
7130 | Use \"info signals\" for a list of symbolic signals.")); | |
7131 | } | |
7132 | ||
c906108c SS |
7133 | /* Print current contents of the tables set by the handle command. |
7134 | It is possible we should just be printing signals actually used | |
7135 | by the current target (but for things to work right when switching | |
7136 | targets, all signals should be in the signal tables). */ | |
7137 | ||
7138 | static void | |
96baa820 | 7139 | signals_info (char *signum_exp, int from_tty) |
c906108c | 7140 | { |
2ea28649 | 7141 | enum gdb_signal oursig; |
abbb1732 | 7142 | |
c906108c SS |
7143 | sig_print_header (); |
7144 | ||
7145 | if (signum_exp) | |
7146 | { | |
7147 | /* First see if this is a symbol name. */ | |
2ea28649 | 7148 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 7149 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
7150 | { |
7151 | /* No, try numeric. */ | |
7152 | oursig = | |
2ea28649 | 7153 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
7154 | } |
7155 | sig_print_info (oursig); | |
7156 | return; | |
7157 | } | |
7158 | ||
7159 | printf_filtered ("\n"); | |
7160 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
7161 | for (oursig = GDB_SIGNAL_FIRST; |
7162 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 7163 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
7164 | { |
7165 | QUIT; | |
7166 | ||
a493e3e2 PA |
7167 | if (oursig != GDB_SIGNAL_UNKNOWN |
7168 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
7169 | sig_print_info (oursig); |
7170 | } | |
7171 | ||
3e43a32a MS |
7172 | printf_filtered (_("\nUse the \"handle\" command " |
7173 | "to change these tables.\n")); | |
c906108c | 7174 | } |
4aa995e1 | 7175 | |
c709acd1 PA |
7176 | /* Check if it makes sense to read $_siginfo from the current thread |
7177 | at this point. If not, throw an error. */ | |
7178 | ||
7179 | static void | |
7180 | validate_siginfo_access (void) | |
7181 | { | |
7182 | /* No current inferior, no siginfo. */ | |
7183 | if (ptid_equal (inferior_ptid, null_ptid)) | |
7184 | error (_("No thread selected.")); | |
7185 | ||
7186 | /* Don't try to read from a dead thread. */ | |
7187 | if (is_exited (inferior_ptid)) | |
7188 | error (_("The current thread has terminated")); | |
7189 | ||
7190 | /* ... or from a spinning thread. */ | |
7191 | if (is_running (inferior_ptid)) | |
7192 | error (_("Selected thread is running.")); | |
7193 | } | |
7194 | ||
4aa995e1 PA |
7195 | /* The $_siginfo convenience variable is a bit special. We don't know |
7196 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 7197 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
7198 | also dependent on which thread you have selected. |
7199 | ||
7200 | 1. making $_siginfo be an internalvar that creates a new value on | |
7201 | access. | |
7202 | ||
7203 | 2. making the value of $_siginfo be an lval_computed value. */ | |
7204 | ||
7205 | /* This function implements the lval_computed support for reading a | |
7206 | $_siginfo value. */ | |
7207 | ||
7208 | static void | |
7209 | siginfo_value_read (struct value *v) | |
7210 | { | |
7211 | LONGEST transferred; | |
7212 | ||
c709acd1 PA |
7213 | validate_siginfo_access (); |
7214 | ||
4aa995e1 PA |
7215 | transferred = |
7216 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
7217 | NULL, | |
7218 | value_contents_all_raw (v), | |
7219 | value_offset (v), | |
7220 | TYPE_LENGTH (value_type (v))); | |
7221 | ||
7222 | if (transferred != TYPE_LENGTH (value_type (v))) | |
7223 | error (_("Unable to read siginfo")); | |
7224 | } | |
7225 | ||
7226 | /* This function implements the lval_computed support for writing a | |
7227 | $_siginfo value. */ | |
7228 | ||
7229 | static void | |
7230 | siginfo_value_write (struct value *v, struct value *fromval) | |
7231 | { | |
7232 | LONGEST transferred; | |
7233 | ||
c709acd1 PA |
7234 | validate_siginfo_access (); |
7235 | ||
4aa995e1 PA |
7236 | transferred = target_write (¤t_target, |
7237 | TARGET_OBJECT_SIGNAL_INFO, | |
7238 | NULL, | |
7239 | value_contents_all_raw (fromval), | |
7240 | value_offset (v), | |
7241 | TYPE_LENGTH (value_type (fromval))); | |
7242 | ||
7243 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
7244 | error (_("Unable to write siginfo")); | |
7245 | } | |
7246 | ||
c8f2448a | 7247 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
7248 | { |
7249 | siginfo_value_read, | |
7250 | siginfo_value_write | |
7251 | }; | |
7252 | ||
7253 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
7254 | the current thread using architecture GDBARCH. Return a void value |
7255 | if there's no object available. */ | |
4aa995e1 | 7256 | |
2c0b251b | 7257 | static struct value * |
22d2b532 SDJ |
7258 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
7259 | void *ignore) | |
4aa995e1 | 7260 | { |
4aa995e1 | 7261 | if (target_has_stack |
78267919 UW |
7262 | && !ptid_equal (inferior_ptid, null_ptid) |
7263 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
4aa995e1 | 7264 | { |
78267919 | 7265 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 7266 | |
78267919 | 7267 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
7268 | } |
7269 | ||
78267919 | 7270 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
7271 | } |
7272 | ||
c906108c | 7273 | \f |
16c381f0 JK |
7274 | /* infcall_suspend_state contains state about the program itself like its |
7275 | registers and any signal it received when it last stopped. | |
7276 | This state must be restored regardless of how the inferior function call | |
7277 | ends (either successfully, or after it hits a breakpoint or signal) | |
7278 | if the program is to properly continue where it left off. */ | |
7279 | ||
7280 | struct infcall_suspend_state | |
7a292a7a | 7281 | { |
16c381f0 | 7282 | struct thread_suspend_state thread_suspend; |
dd80ea3c | 7283 | #if 0 /* Currently unused and empty structures are not valid C. */ |
16c381f0 | 7284 | struct inferior_suspend_state inferior_suspend; |
dd80ea3c | 7285 | #endif |
16c381f0 JK |
7286 | |
7287 | /* Other fields: */ | |
7a292a7a | 7288 | CORE_ADDR stop_pc; |
b89667eb | 7289 | struct regcache *registers; |
1736ad11 | 7290 | |
35515841 | 7291 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
1736ad11 JK |
7292 | struct gdbarch *siginfo_gdbarch; |
7293 | ||
7294 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
7295 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
7296 | content would be invalid. */ | |
7297 | gdb_byte *siginfo_data; | |
b89667eb DE |
7298 | }; |
7299 | ||
16c381f0 JK |
7300 | struct infcall_suspend_state * |
7301 | save_infcall_suspend_state (void) | |
b89667eb | 7302 | { |
16c381f0 | 7303 | struct infcall_suspend_state *inf_state; |
b89667eb | 7304 | struct thread_info *tp = inferior_thread (); |
974a734b | 7305 | #if 0 |
16c381f0 | 7306 | struct inferior *inf = current_inferior (); |
974a734b | 7307 | #endif |
1736ad11 JK |
7308 | struct regcache *regcache = get_current_regcache (); |
7309 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7310 | gdb_byte *siginfo_data = NULL; | |
7311 | ||
7312 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
7313 | { | |
7314 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
7315 | size_t len = TYPE_LENGTH (type); | |
7316 | struct cleanup *back_to; | |
7317 | ||
7318 | siginfo_data = xmalloc (len); | |
7319 | back_to = make_cleanup (xfree, siginfo_data); | |
7320 | ||
7321 | if (target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
7322 | siginfo_data, 0, len) == len) | |
7323 | discard_cleanups (back_to); | |
7324 | else | |
7325 | { | |
7326 | /* Errors ignored. */ | |
7327 | do_cleanups (back_to); | |
7328 | siginfo_data = NULL; | |
7329 | } | |
7330 | } | |
7331 | ||
41bf6aca | 7332 | inf_state = XCNEW (struct infcall_suspend_state); |
1736ad11 JK |
7333 | |
7334 | if (siginfo_data) | |
7335 | { | |
7336 | inf_state->siginfo_gdbarch = gdbarch; | |
7337 | inf_state->siginfo_data = siginfo_data; | |
7338 | } | |
b89667eb | 7339 | |
16c381f0 | 7340 | inf_state->thread_suspend = tp->suspend; |
dd80ea3c | 7341 | #if 0 /* Currently unused and empty structures are not valid C. */ |
16c381f0 | 7342 | inf_state->inferior_suspend = inf->suspend; |
dd80ea3c | 7343 | #endif |
16c381f0 | 7344 | |
35515841 | 7345 | /* run_inferior_call will not use the signal due to its `proceed' call with |
a493e3e2 PA |
7346 | GDB_SIGNAL_0 anyway. */ |
7347 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
35515841 | 7348 | |
b89667eb DE |
7349 | inf_state->stop_pc = stop_pc; |
7350 | ||
1736ad11 | 7351 | inf_state->registers = regcache_dup (regcache); |
b89667eb DE |
7352 | |
7353 | return inf_state; | |
7354 | } | |
7355 | ||
7356 | /* Restore inferior session state to INF_STATE. */ | |
7357 | ||
7358 | void | |
16c381f0 | 7359 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
7360 | { |
7361 | struct thread_info *tp = inferior_thread (); | |
974a734b | 7362 | #if 0 |
16c381f0 | 7363 | struct inferior *inf = current_inferior (); |
974a734b | 7364 | #endif |
1736ad11 JK |
7365 | struct regcache *regcache = get_current_regcache (); |
7366 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
b89667eb | 7367 | |
16c381f0 | 7368 | tp->suspend = inf_state->thread_suspend; |
dd80ea3c | 7369 | #if 0 /* Currently unused and empty structures are not valid C. */ |
16c381f0 | 7370 | inf->suspend = inf_state->inferior_suspend; |
dd80ea3c | 7371 | #endif |
16c381f0 | 7372 | |
b89667eb DE |
7373 | stop_pc = inf_state->stop_pc; |
7374 | ||
1736ad11 JK |
7375 | if (inf_state->siginfo_gdbarch == gdbarch) |
7376 | { | |
7377 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
1736ad11 JK |
7378 | |
7379 | /* Errors ignored. */ | |
7380 | target_write (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6acef6cd | 7381 | inf_state->siginfo_data, 0, TYPE_LENGTH (type)); |
1736ad11 JK |
7382 | } |
7383 | ||
b89667eb DE |
7384 | /* The inferior can be gone if the user types "print exit(0)" |
7385 | (and perhaps other times). */ | |
7386 | if (target_has_execution) | |
7387 | /* NB: The register write goes through to the target. */ | |
1736ad11 | 7388 | regcache_cpy (regcache, inf_state->registers); |
803b5f95 | 7389 | |
16c381f0 | 7390 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
7391 | } |
7392 | ||
7393 | static void | |
16c381f0 | 7394 | do_restore_infcall_suspend_state_cleanup (void *state) |
b89667eb | 7395 | { |
16c381f0 | 7396 | restore_infcall_suspend_state (state); |
b89667eb DE |
7397 | } |
7398 | ||
7399 | struct cleanup * | |
16c381f0 JK |
7400 | make_cleanup_restore_infcall_suspend_state |
7401 | (struct infcall_suspend_state *inf_state) | |
b89667eb | 7402 | { |
16c381f0 | 7403 | return make_cleanup (do_restore_infcall_suspend_state_cleanup, inf_state); |
b89667eb DE |
7404 | } |
7405 | ||
7406 | void | |
16c381f0 | 7407 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
7408 | { |
7409 | regcache_xfree (inf_state->registers); | |
803b5f95 | 7410 | xfree (inf_state->siginfo_data); |
b89667eb DE |
7411 | xfree (inf_state); |
7412 | } | |
7413 | ||
7414 | struct regcache * | |
16c381f0 | 7415 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb DE |
7416 | { |
7417 | return inf_state->registers; | |
7418 | } | |
7419 | ||
16c381f0 JK |
7420 | /* infcall_control_state contains state regarding gdb's control of the |
7421 | inferior itself like stepping control. It also contains session state like | |
7422 | the user's currently selected frame. */ | |
b89667eb | 7423 | |
16c381f0 | 7424 | struct infcall_control_state |
b89667eb | 7425 | { |
16c381f0 JK |
7426 | struct thread_control_state thread_control; |
7427 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
7428 | |
7429 | /* Other fields: */ | |
7430 | enum stop_stack_kind stop_stack_dummy; | |
7431 | int stopped_by_random_signal; | |
7a292a7a | 7432 | int stop_after_trap; |
7a292a7a | 7433 | |
b89667eb | 7434 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe | 7435 | struct frame_id selected_frame_id; |
7a292a7a SS |
7436 | }; |
7437 | ||
c906108c | 7438 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 7439 | connection. */ |
c906108c | 7440 | |
16c381f0 JK |
7441 | struct infcall_control_state * |
7442 | save_infcall_control_state (void) | |
c906108c | 7443 | { |
16c381f0 | 7444 | struct infcall_control_state *inf_status = xmalloc (sizeof (*inf_status)); |
4e1c45ea | 7445 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 7446 | struct inferior *inf = current_inferior (); |
7a292a7a | 7447 | |
16c381f0 JK |
7448 | inf_status->thread_control = tp->control; |
7449 | inf_status->inferior_control = inf->control; | |
d82142e2 | 7450 | |
8358c15c | 7451 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 7452 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 7453 | |
16c381f0 JK |
7454 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
7455 | chain. If caller's caller is walking the chain, they'll be happier if we | |
7456 | hand them back the original chain when restore_infcall_control_state is | |
7457 | called. */ | |
7458 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
7459 | |
7460 | /* Other fields: */ | |
7461 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
7462 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
7463 | inf_status->stop_after_trap = stop_after_trap; | |
c5aa993b | 7464 | |
206415a3 | 7465 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 7466 | |
7a292a7a | 7467 | return inf_status; |
c906108c SS |
7468 | } |
7469 | ||
c906108c | 7470 | static int |
96baa820 | 7471 | restore_selected_frame (void *args) |
c906108c | 7472 | { |
488f131b | 7473 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 7474 | struct frame_info *frame; |
c906108c | 7475 | |
101dcfbe | 7476 | frame = frame_find_by_id (*fid); |
c906108c | 7477 | |
aa0cd9c1 AC |
7478 | /* If inf_status->selected_frame_id is NULL, there was no previously |
7479 | selected frame. */ | |
101dcfbe | 7480 | if (frame == NULL) |
c906108c | 7481 | { |
8a3fe4f8 | 7482 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
7483 | return 0; |
7484 | } | |
7485 | ||
0f7d239c | 7486 | select_frame (frame); |
c906108c SS |
7487 | |
7488 | return (1); | |
7489 | } | |
7490 | ||
b89667eb DE |
7491 | /* Restore inferior session state to INF_STATUS. */ |
7492 | ||
c906108c | 7493 | void |
16c381f0 | 7494 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 7495 | { |
4e1c45ea | 7496 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 7497 | struct inferior *inf = current_inferior (); |
4e1c45ea | 7498 | |
8358c15c JK |
7499 | if (tp->control.step_resume_breakpoint) |
7500 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
7501 | ||
5b79abe7 TT |
7502 | if (tp->control.exception_resume_breakpoint) |
7503 | tp->control.exception_resume_breakpoint->disposition | |
7504 | = disp_del_at_next_stop; | |
7505 | ||
d82142e2 | 7506 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 7507 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 7508 | |
16c381f0 JK |
7509 | tp->control = inf_status->thread_control; |
7510 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
7511 | |
7512 | /* Other fields: */ | |
7513 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
7514 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
7515 | stop_after_trap = inf_status->stop_after_trap; | |
c906108c | 7516 | |
b89667eb | 7517 | if (target_has_stack) |
c906108c | 7518 | { |
c906108c | 7519 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
7520 | walking the stack might encounter a garbage pointer and |
7521 | error() trying to dereference it. */ | |
488f131b JB |
7522 | if (catch_errors |
7523 | (restore_selected_frame, &inf_status->selected_frame_id, | |
7524 | "Unable to restore previously selected frame:\n", | |
7525 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
7526 | /* Error in restoring the selected frame. Select the innermost |
7527 | frame. */ | |
0f7d239c | 7528 | select_frame (get_current_frame ()); |
c906108c | 7529 | } |
c906108c | 7530 | |
72cec141 | 7531 | xfree (inf_status); |
7a292a7a | 7532 | } |
c906108c | 7533 | |
74b7792f | 7534 | static void |
16c381f0 | 7535 | do_restore_infcall_control_state_cleanup (void *sts) |
74b7792f | 7536 | { |
16c381f0 | 7537 | restore_infcall_control_state (sts); |
74b7792f AC |
7538 | } |
7539 | ||
7540 | struct cleanup * | |
16c381f0 JK |
7541 | make_cleanup_restore_infcall_control_state |
7542 | (struct infcall_control_state *inf_status) | |
74b7792f | 7543 | { |
16c381f0 | 7544 | return make_cleanup (do_restore_infcall_control_state_cleanup, inf_status); |
74b7792f AC |
7545 | } |
7546 | ||
c906108c | 7547 | void |
16c381f0 | 7548 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 7549 | { |
8358c15c JK |
7550 | if (inf_status->thread_control.step_resume_breakpoint) |
7551 | inf_status->thread_control.step_resume_breakpoint->disposition | |
7552 | = disp_del_at_next_stop; | |
7553 | ||
5b79abe7 TT |
7554 | if (inf_status->thread_control.exception_resume_breakpoint) |
7555 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
7556 | = disp_del_at_next_stop; | |
7557 | ||
1777feb0 | 7558 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 7559 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 7560 | |
72cec141 | 7561 | xfree (inf_status); |
7a292a7a | 7562 | } |
b89667eb | 7563 | \f |
ca6724c1 KB |
7564 | /* restore_inferior_ptid() will be used by the cleanup machinery |
7565 | to restore the inferior_ptid value saved in a call to | |
7566 | save_inferior_ptid(). */ | |
ce696e05 KB |
7567 | |
7568 | static void | |
7569 | restore_inferior_ptid (void *arg) | |
7570 | { | |
7571 | ptid_t *saved_ptid_ptr = arg; | |
abbb1732 | 7572 | |
ce696e05 KB |
7573 | inferior_ptid = *saved_ptid_ptr; |
7574 | xfree (arg); | |
7575 | } | |
7576 | ||
7577 | /* Save the value of inferior_ptid so that it may be restored by a | |
7578 | later call to do_cleanups(). Returns the struct cleanup pointer | |
7579 | needed for later doing the cleanup. */ | |
7580 | ||
7581 | struct cleanup * | |
7582 | save_inferior_ptid (void) | |
7583 | { | |
7584 | ptid_t *saved_ptid_ptr; | |
7585 | ||
7586 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
7587 | *saved_ptid_ptr = inferior_ptid; | |
7588 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
7589 | } | |
0c557179 | 7590 | |
7f89fd65 | 7591 | /* See infrun.h. */ |
0c557179 SDJ |
7592 | |
7593 | void | |
7594 | clear_exit_convenience_vars (void) | |
7595 | { | |
7596 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
7597 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
7598 | } | |
c5aa993b | 7599 | \f |
488f131b | 7600 | |
b2175913 MS |
7601 | /* User interface for reverse debugging: |
7602 | Set exec-direction / show exec-direction commands | |
7603 | (returns error unless target implements to_set_exec_direction method). */ | |
7604 | ||
32231432 | 7605 | int execution_direction = EXEC_FORWARD; |
b2175913 MS |
7606 | static const char exec_forward[] = "forward"; |
7607 | static const char exec_reverse[] = "reverse"; | |
7608 | static const char *exec_direction = exec_forward; | |
40478521 | 7609 | static const char *const exec_direction_names[] = { |
b2175913 MS |
7610 | exec_forward, |
7611 | exec_reverse, | |
7612 | NULL | |
7613 | }; | |
7614 | ||
7615 | static void | |
7616 | set_exec_direction_func (char *args, int from_tty, | |
7617 | struct cmd_list_element *cmd) | |
7618 | { | |
7619 | if (target_can_execute_reverse) | |
7620 | { | |
7621 | if (!strcmp (exec_direction, exec_forward)) | |
7622 | execution_direction = EXEC_FORWARD; | |
7623 | else if (!strcmp (exec_direction, exec_reverse)) | |
7624 | execution_direction = EXEC_REVERSE; | |
7625 | } | |
8bbed405 MS |
7626 | else |
7627 | { | |
7628 | exec_direction = exec_forward; | |
7629 | error (_("Target does not support this operation.")); | |
7630 | } | |
b2175913 MS |
7631 | } |
7632 | ||
7633 | static void | |
7634 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
7635 | struct cmd_list_element *cmd, const char *value) | |
7636 | { | |
7637 | switch (execution_direction) { | |
7638 | case EXEC_FORWARD: | |
7639 | fprintf_filtered (out, _("Forward.\n")); | |
7640 | break; | |
7641 | case EXEC_REVERSE: | |
7642 | fprintf_filtered (out, _("Reverse.\n")); | |
7643 | break; | |
b2175913 | 7644 | default: |
d8b34453 PA |
7645 | internal_error (__FILE__, __LINE__, |
7646 | _("bogus execution_direction value: %d"), | |
7647 | (int) execution_direction); | |
b2175913 MS |
7648 | } |
7649 | } | |
7650 | ||
d4db2f36 PA |
7651 | static void |
7652 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
7653 | struct cmd_list_element *c, const char *value) | |
7654 | { | |
3e43a32a MS |
7655 | fprintf_filtered (file, _("Resuming the execution of threads " |
7656 | "of all processes is %s.\n"), value); | |
d4db2f36 | 7657 | } |
ad52ddc6 | 7658 | |
22d2b532 SDJ |
7659 | /* Implementation of `siginfo' variable. */ |
7660 | ||
7661 | static const struct internalvar_funcs siginfo_funcs = | |
7662 | { | |
7663 | siginfo_make_value, | |
7664 | NULL, | |
7665 | NULL | |
7666 | }; | |
7667 | ||
c906108c | 7668 | void |
96baa820 | 7669 | _initialize_infrun (void) |
c906108c | 7670 | { |
52f0bd74 AC |
7671 | int i; |
7672 | int numsigs; | |
de0bea00 | 7673 | struct cmd_list_element *c; |
c906108c | 7674 | |
1bedd215 AC |
7675 | add_info ("signals", signals_info, _("\ |
7676 | What debugger does when program gets various signals.\n\ | |
7677 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
7678 | add_info_alias ("handle", "signals", 0); |
7679 | ||
de0bea00 | 7680 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 7681 | Specify how to handle signals.\n\ |
486c7739 | 7682 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 7683 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 7684 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
7685 | will be displayed instead.\n\ |
7686 | \n\ | |
c906108c SS |
7687 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
7688 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
7689 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
7690 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 7691 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 7692 | \n\ |
1bedd215 | 7693 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
7694 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
7695 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
7696 | Print means print a message if this signal happens.\n\ | |
7697 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
7698 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
7699 | Pass and Stop may be combined.\n\ |
7700 | \n\ | |
7701 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
7702 | may be interspersed with actions, with the actions being performed for\n\ | |
7703 | all signals cumulatively specified.")); | |
de0bea00 | 7704 | set_cmd_completer (c, handle_completer); |
486c7739 | 7705 | |
c906108c SS |
7706 | if (xdb_commands) |
7707 | { | |
1bedd215 AC |
7708 | add_com ("lz", class_info, signals_info, _("\ |
7709 | What debugger does when program gets various signals.\n\ | |
7710 | Specify a signal as argument to print info on that signal only.")); | |
7711 | add_com ("z", class_run, xdb_handle_command, _("\ | |
7712 | Specify how to handle a signal.\n\ | |
c906108c SS |
7713 | Args are signals and actions to apply to those signals.\n\ |
7714 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
7715 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
7716 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
7717 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 7718 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
cce7e648 | 7719 | Recognized actions include \"s\" (toggles between stop and nostop),\n\ |
c906108c SS |
7720 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
7721 | nopass), \"Q\" (noprint)\n\ | |
7722 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
7723 | Print means print a message if this signal happens.\n\ | |
7724 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
7725 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 7726 | Pass and Stop may be combined.")); |
c906108c SS |
7727 | } |
7728 | ||
7729 | if (!dbx_commands) | |
1a966eab AC |
7730 | stop_command = add_cmd ("stop", class_obscure, |
7731 | not_just_help_class_command, _("\ | |
7732 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 7733 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 7734 | of the program stops."), &cmdlist); |
c906108c | 7735 | |
ccce17b0 | 7736 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
7737 | Set inferior debugging."), _("\ |
7738 | Show inferior debugging."), _("\ | |
7739 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
7740 | NULL, |
7741 | show_debug_infrun, | |
7742 | &setdebuglist, &showdebuglist); | |
527159b7 | 7743 | |
3e43a32a MS |
7744 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
7745 | &debug_displaced, _("\ | |
237fc4c9 PA |
7746 | Set displaced stepping debugging."), _("\ |
7747 | Show displaced stepping debugging."), _("\ | |
7748 | When non-zero, displaced stepping specific debugging is enabled."), | |
7749 | NULL, | |
7750 | show_debug_displaced, | |
7751 | &setdebuglist, &showdebuglist); | |
7752 | ||
ad52ddc6 PA |
7753 | add_setshow_boolean_cmd ("non-stop", no_class, |
7754 | &non_stop_1, _("\ | |
7755 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
7756 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
7757 | When debugging a multi-threaded program and this setting is\n\ | |
7758 | off (the default, also called all-stop mode), when one thread stops\n\ | |
7759 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
7760 | all other threads in the program while you interact with the thread of\n\ | |
7761 | interest. When you continue or step a thread, you can allow the other\n\ | |
7762 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
7763 | thread's state, all threads stop.\n\ | |
7764 | \n\ | |
7765 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
7766 | to run freely. You'll be able to step each thread independently,\n\ | |
7767 | leave it stopped or free to run as needed."), | |
7768 | set_non_stop, | |
7769 | show_non_stop, | |
7770 | &setlist, | |
7771 | &showlist); | |
7772 | ||
a493e3e2 | 7773 | numsigs = (int) GDB_SIGNAL_LAST; |
488f131b | 7774 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
7775 | signal_print = (unsigned char *) |
7776 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
7777 | signal_program = (unsigned char *) | |
7778 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
ab04a2af TT |
7779 | signal_catch = (unsigned char *) |
7780 | xmalloc (sizeof (signal_catch[0]) * numsigs); | |
2455069d | 7781 | signal_pass = (unsigned char *) |
4395285e | 7782 | xmalloc (sizeof (signal_pass[0]) * numsigs); |
c906108c SS |
7783 | for (i = 0; i < numsigs; i++) |
7784 | { | |
7785 | signal_stop[i] = 1; | |
7786 | signal_print[i] = 1; | |
7787 | signal_program[i] = 1; | |
ab04a2af | 7788 | signal_catch[i] = 0; |
c906108c SS |
7789 | } |
7790 | ||
7791 | /* Signals caused by debugger's own actions | |
7792 | should not be given to the program afterwards. */ | |
a493e3e2 PA |
7793 | signal_program[GDB_SIGNAL_TRAP] = 0; |
7794 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
7795 | |
7796 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
7797 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
7798 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
7799 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
7800 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
7801 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
7802 | signal_print[GDB_SIGNAL_PROF] = 0; | |
7803 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
7804 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
7805 | signal_stop[GDB_SIGNAL_IO] = 0; | |
7806 | signal_print[GDB_SIGNAL_IO] = 0; | |
7807 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
7808 | signal_print[GDB_SIGNAL_POLL] = 0; | |
7809 | signal_stop[GDB_SIGNAL_URG] = 0; | |
7810 | signal_print[GDB_SIGNAL_URG] = 0; | |
7811 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
7812 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
7813 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
7814 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 7815 | |
cd0fc7c3 SS |
7816 | /* These signals are used internally by user-level thread |
7817 | implementations. (See signal(5) on Solaris.) Like the above | |
7818 | signals, a healthy program receives and handles them as part of | |
7819 | its normal operation. */ | |
a493e3e2 PA |
7820 | signal_stop[GDB_SIGNAL_LWP] = 0; |
7821 | signal_print[GDB_SIGNAL_LWP] = 0; | |
7822 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
7823 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
7824 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
7825 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
cd0fc7c3 | 7826 | |
2455069d UW |
7827 | /* Update cached state. */ |
7828 | signal_cache_update (-1); | |
7829 | ||
85c07804 AC |
7830 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
7831 | &stop_on_solib_events, _("\ | |
7832 | Set stopping for shared library events."), _("\ | |
7833 | Show stopping for shared library events."), _("\ | |
c906108c SS |
7834 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
7835 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 7836 | to the user would be loading/unloading of a new library."), |
f9e14852 | 7837 | set_stop_on_solib_events, |
920d2a44 | 7838 | show_stop_on_solib_events, |
85c07804 | 7839 | &setlist, &showlist); |
c906108c | 7840 | |
7ab04401 AC |
7841 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
7842 | follow_fork_mode_kind_names, | |
7843 | &follow_fork_mode_string, _("\ | |
7844 | Set debugger response to a program call of fork or vfork."), _("\ | |
7845 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
7846 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
7847 | parent - the original process is debugged after a fork\n\ | |
7848 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 7849 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
7850 | By default, the debugger will follow the parent process."), |
7851 | NULL, | |
920d2a44 | 7852 | show_follow_fork_mode_string, |
7ab04401 AC |
7853 | &setlist, &showlist); |
7854 | ||
6c95b8df PA |
7855 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
7856 | follow_exec_mode_names, | |
7857 | &follow_exec_mode_string, _("\ | |
7858 | Set debugger response to a program call of exec."), _("\ | |
7859 | Show debugger response to a program call of exec."), _("\ | |
7860 | An exec call replaces the program image of a process.\n\ | |
7861 | \n\ | |
7862 | follow-exec-mode can be:\n\ | |
7863 | \n\ | |
cce7e648 | 7864 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
7865 | to this new inferior. The program the process was running before\n\ |
7866 | the exec call can be restarted afterwards by restarting the original\n\ | |
7867 | inferior.\n\ | |
7868 | \n\ | |
7869 | same - the debugger keeps the process bound to the same inferior.\n\ | |
7870 | The new executable image replaces the previous executable loaded in\n\ | |
7871 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
7872 | the executable the process was running after the exec call.\n\ | |
7873 | \n\ | |
7874 | By default, the debugger will use the same inferior."), | |
7875 | NULL, | |
7876 | show_follow_exec_mode_string, | |
7877 | &setlist, &showlist); | |
7878 | ||
7ab04401 AC |
7879 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
7880 | scheduler_enums, &scheduler_mode, _("\ | |
7881 | Set mode for locking scheduler during execution."), _("\ | |
7882 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
7883 | off == no locking (threads may preempt at any time)\n\ |
7884 | on == full locking (no thread except the current thread may run)\n\ | |
856e7dd6 PA |
7885 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ |
7886 | In this mode, other threads may run during other commands."), | |
7ab04401 | 7887 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 7888 | show_scheduler_mode, |
7ab04401 | 7889 | &setlist, &showlist); |
5fbbeb29 | 7890 | |
d4db2f36 PA |
7891 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
7892 | Set mode for resuming threads of all processes."), _("\ | |
7893 | Show mode for resuming threads of all processes."), _("\ | |
7894 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
7895 | threads of all processes. When off (which is the default), execution\n\ | |
7896 | commands only resume the threads of the current process. The set of\n\ | |
7897 | threads that are resumed is further refined by the scheduler-locking\n\ | |
7898 | mode (see help set scheduler-locking)."), | |
7899 | NULL, | |
7900 | show_schedule_multiple, | |
7901 | &setlist, &showlist); | |
7902 | ||
5bf193a2 AC |
7903 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
7904 | Set mode of the step operation."), _("\ | |
7905 | Show mode of the step operation."), _("\ | |
7906 | When set, doing a step over a function without debug line information\n\ | |
7907 | will stop at the first instruction of that function. Otherwise, the\n\ | |
7908 | function is skipped and the step command stops at a different source line."), | |
7909 | NULL, | |
920d2a44 | 7910 | show_step_stop_if_no_debug, |
5bf193a2 | 7911 | &setlist, &showlist); |
ca6724c1 | 7912 | |
72d0e2c5 YQ |
7913 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
7914 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
7915 | Set debugger's willingness to use displaced stepping."), _("\ |
7916 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
7917 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
7918 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
7919 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
7920 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
7921 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
7922 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
7923 | NULL, |
7924 | show_can_use_displaced_stepping, | |
7925 | &setlist, &showlist); | |
237fc4c9 | 7926 | |
b2175913 MS |
7927 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
7928 | &exec_direction, _("Set direction of execution.\n\ | |
7929 | Options are 'forward' or 'reverse'."), | |
7930 | _("Show direction of execution (forward/reverse)."), | |
7931 | _("Tells gdb whether to execute forward or backward."), | |
7932 | set_exec_direction_func, show_exec_direction_func, | |
7933 | &setlist, &showlist); | |
7934 | ||
6c95b8df PA |
7935 | /* Set/show detach-on-fork: user-settable mode. */ |
7936 | ||
7937 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
7938 | Set whether gdb will detach the child of a fork."), _("\ | |
7939 | Show whether gdb will detach the child of a fork."), _("\ | |
7940 | Tells gdb whether to detach the child of a fork."), | |
7941 | NULL, NULL, &setlist, &showlist); | |
7942 | ||
03583c20 UW |
7943 | /* Set/show disable address space randomization mode. */ |
7944 | ||
7945 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
7946 | &disable_randomization, _("\ | |
7947 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
7948 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
7949 | When this mode is on (which is the default), randomization of the virtual\n\ | |
7950 | address space is disabled. Standalone programs run with the randomization\n\ | |
7951 | enabled by default on some platforms."), | |
7952 | &set_disable_randomization, | |
7953 | &show_disable_randomization, | |
7954 | &setlist, &showlist); | |
7955 | ||
ca6724c1 | 7956 | /* ptid initializations */ |
ca6724c1 KB |
7957 | inferior_ptid = null_ptid; |
7958 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd PA |
7959 | |
7960 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 7961 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 7962 | observer_attach_thread_exit (infrun_thread_thread_exit); |
fc1cf338 | 7963 | observer_attach_inferior_exit (infrun_inferior_exit); |
4aa995e1 PA |
7964 | |
7965 | /* Explicitly create without lookup, since that tries to create a | |
7966 | value with a void typed value, and when we get here, gdbarch | |
7967 | isn't initialized yet. At this point, we're quite sure there | |
7968 | isn't another convenience variable of the same name. */ | |
22d2b532 | 7969 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
7970 | |
7971 | add_setshow_boolean_cmd ("observer", no_class, | |
7972 | &observer_mode_1, _("\ | |
7973 | Set whether gdb controls the inferior in observer mode."), _("\ | |
7974 | Show whether gdb controls the inferior in observer mode."), _("\ | |
7975 | In observer mode, GDB can get data from the inferior, but not\n\ | |
7976 | affect its execution. Registers and memory may not be changed,\n\ | |
7977 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
7978 | or signalled."), | |
7979 | set_observer_mode, | |
7980 | show_observer_mode, | |
7981 | &setlist, | |
7982 | &showlist); | |
c906108c | 7983 | } |