Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
32d0add0 | 4 | Copyright (C) 1986-2015 Free Software Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 11 | (at your option) any later version. |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | #include "defs.h" | |
45741a9c | 22 | #include "infrun.h" |
c906108c SS |
23 | #include <ctype.h> |
24 | #include "symtab.h" | |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "breakpoint.h" | |
03f2053f | 28 | #include "gdb_wait.h" |
c906108c SS |
29 | #include "gdbcore.h" |
30 | #include "gdbcmd.h" | |
210661e7 | 31 | #include "cli/cli-script.h" |
c906108c SS |
32 | #include "target.h" |
33 | #include "gdbthread.h" | |
34 | #include "annotate.h" | |
1adeb98a | 35 | #include "symfile.h" |
7a292a7a | 36 | #include "top.h" |
c906108c | 37 | #include <signal.h> |
2acceee2 | 38 | #include "inf-loop.h" |
4e052eda | 39 | #include "regcache.h" |
fd0407d6 | 40 | #include "value.h" |
06600e06 | 41 | #include "observer.h" |
f636b87d | 42 | #include "language.h" |
a77053c2 | 43 | #include "solib.h" |
f17517ea | 44 | #include "main.h" |
186c406b TT |
45 | #include "dictionary.h" |
46 | #include "block.h" | |
034dad6f | 47 | #include "mi/mi-common.h" |
4f8d22e3 | 48 | #include "event-top.h" |
96429cc8 | 49 | #include "record.h" |
d02ed0bb | 50 | #include "record-full.h" |
edb3359d | 51 | #include "inline-frame.h" |
4efc6507 | 52 | #include "jit.h" |
06cd862c | 53 | #include "tracepoint.h" |
be34f849 | 54 | #include "continuations.h" |
b4a14fd0 | 55 | #include "interps.h" |
1bfeeb0f | 56 | #include "skip.h" |
28106bc2 SDJ |
57 | #include "probe.h" |
58 | #include "objfiles.h" | |
de0bea00 | 59 | #include "completer.h" |
9107fc8d | 60 | #include "target-descriptions.h" |
f15cb84a | 61 | #include "target-dcache.h" |
d83ad864 | 62 | #include "terminal.h" |
ff862be4 | 63 | #include "solist.h" |
372316f1 | 64 | #include "event-loop.h" |
243a9253 | 65 | #include "thread-fsm.h" |
c906108c SS |
66 | |
67 | /* Prototypes for local functions */ | |
68 | ||
96baa820 | 69 | static void signals_info (char *, int); |
c906108c | 70 | |
96baa820 | 71 | static void handle_command (char *, int); |
c906108c | 72 | |
2ea28649 | 73 | static void sig_print_info (enum gdb_signal); |
c906108c | 74 | |
96baa820 | 75 | static void sig_print_header (void); |
c906108c | 76 | |
74b7792f | 77 | static void resume_cleanups (void *); |
c906108c | 78 | |
96baa820 | 79 | static int hook_stop_stub (void *); |
c906108c | 80 | |
96baa820 JM |
81 | static int restore_selected_frame (void *); |
82 | ||
4ef3f3be | 83 | static int follow_fork (void); |
96baa820 | 84 | |
d83ad864 DB |
85 | static int follow_fork_inferior (int follow_child, int detach_fork); |
86 | ||
87 | static void follow_inferior_reset_breakpoints (void); | |
88 | ||
96baa820 | 89 | static void set_schedlock_func (char *args, int from_tty, |
488f131b | 90 | struct cmd_list_element *c); |
96baa820 | 91 | |
a289b8f6 JK |
92 | static int currently_stepping (struct thread_info *tp); |
93 | ||
96baa820 | 94 | void _initialize_infrun (void); |
43ff13b4 | 95 | |
e58b0e63 PA |
96 | void nullify_last_target_wait_ptid (void); |
97 | ||
2c03e5be | 98 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
99 | |
100 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
101 | ||
2484c66b UW |
102 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
103 | ||
8550d3b3 YQ |
104 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
105 | ||
372316f1 PA |
106 | /* Asynchronous signal handler registered as event loop source for |
107 | when we have pending events ready to be passed to the core. */ | |
108 | static struct async_event_handler *infrun_async_inferior_event_token; | |
109 | ||
110 | /* Stores whether infrun_async was previously enabled or disabled. | |
111 | Starts off as -1, indicating "never enabled/disabled". */ | |
112 | static int infrun_is_async = -1; | |
113 | ||
114 | /* See infrun.h. */ | |
115 | ||
116 | void | |
117 | infrun_async (int enable) | |
118 | { | |
119 | if (infrun_is_async != enable) | |
120 | { | |
121 | infrun_is_async = enable; | |
122 | ||
123 | if (debug_infrun) | |
124 | fprintf_unfiltered (gdb_stdlog, | |
125 | "infrun: infrun_async(%d)\n", | |
126 | enable); | |
127 | ||
128 | if (enable) | |
129 | mark_async_event_handler (infrun_async_inferior_event_token); | |
130 | else | |
131 | clear_async_event_handler (infrun_async_inferior_event_token); | |
132 | } | |
133 | } | |
134 | ||
0b333c5e PA |
135 | /* See infrun.h. */ |
136 | ||
137 | void | |
138 | mark_infrun_async_event_handler (void) | |
139 | { | |
140 | mark_async_event_handler (infrun_async_inferior_event_token); | |
141 | } | |
142 | ||
5fbbeb29 CF |
143 | /* When set, stop the 'step' command if we enter a function which has |
144 | no line number information. The normal behavior is that we step | |
145 | over such function. */ | |
146 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
147 | static void |
148 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
149 | struct cmd_list_element *c, const char *value) | |
150 | { | |
151 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
152 | } | |
5fbbeb29 | 153 | |
1777feb0 | 154 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 155 | |
43ff13b4 JM |
156 | int sync_execution = 0; |
157 | ||
b9f437de PA |
158 | /* proceed and normal_stop use this to notify the user when the |
159 | inferior stopped in a different thread than it had been running | |
160 | in. */ | |
96baa820 | 161 | |
39f77062 | 162 | static ptid_t previous_inferior_ptid; |
7a292a7a | 163 | |
07107ca6 LM |
164 | /* If set (default for legacy reasons), when following a fork, GDB |
165 | will detach from one of the fork branches, child or parent. | |
166 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
167 | setting. */ | |
168 | ||
169 | static int detach_fork = 1; | |
6c95b8df | 170 | |
237fc4c9 PA |
171 | int debug_displaced = 0; |
172 | static void | |
173 | show_debug_displaced (struct ui_file *file, int from_tty, | |
174 | struct cmd_list_element *c, const char *value) | |
175 | { | |
176 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
177 | } | |
178 | ||
ccce17b0 | 179 | unsigned int debug_infrun = 0; |
920d2a44 AC |
180 | static void |
181 | show_debug_infrun (struct ui_file *file, int from_tty, | |
182 | struct cmd_list_element *c, const char *value) | |
183 | { | |
184 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
185 | } | |
527159b7 | 186 | |
03583c20 UW |
187 | |
188 | /* Support for disabling address space randomization. */ | |
189 | ||
190 | int disable_randomization = 1; | |
191 | ||
192 | static void | |
193 | show_disable_randomization (struct ui_file *file, int from_tty, | |
194 | struct cmd_list_element *c, const char *value) | |
195 | { | |
196 | if (target_supports_disable_randomization ()) | |
197 | fprintf_filtered (file, | |
198 | _("Disabling randomization of debuggee's " | |
199 | "virtual address space is %s.\n"), | |
200 | value); | |
201 | else | |
202 | fputs_filtered (_("Disabling randomization of debuggee's " | |
203 | "virtual address space is unsupported on\n" | |
204 | "this platform.\n"), file); | |
205 | } | |
206 | ||
207 | static void | |
208 | set_disable_randomization (char *args, int from_tty, | |
209 | struct cmd_list_element *c) | |
210 | { | |
211 | if (!target_supports_disable_randomization ()) | |
212 | error (_("Disabling randomization of debuggee's " | |
213 | "virtual address space is unsupported on\n" | |
214 | "this platform.")); | |
215 | } | |
216 | ||
d32dc48e PA |
217 | /* User interface for non-stop mode. */ |
218 | ||
219 | int non_stop = 0; | |
220 | static int non_stop_1 = 0; | |
221 | ||
222 | static void | |
223 | set_non_stop (char *args, int from_tty, | |
224 | struct cmd_list_element *c) | |
225 | { | |
226 | if (target_has_execution) | |
227 | { | |
228 | non_stop_1 = non_stop; | |
229 | error (_("Cannot change this setting while the inferior is running.")); | |
230 | } | |
231 | ||
232 | non_stop = non_stop_1; | |
233 | } | |
234 | ||
235 | static void | |
236 | show_non_stop (struct ui_file *file, int from_tty, | |
237 | struct cmd_list_element *c, const char *value) | |
238 | { | |
239 | fprintf_filtered (file, | |
240 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
241 | value); | |
242 | } | |
243 | ||
d914c394 SS |
244 | /* "Observer mode" is somewhat like a more extreme version of |
245 | non-stop, in which all GDB operations that might affect the | |
246 | target's execution have been disabled. */ | |
247 | ||
d914c394 SS |
248 | int observer_mode = 0; |
249 | static int observer_mode_1 = 0; | |
250 | ||
251 | static void | |
252 | set_observer_mode (char *args, int from_tty, | |
253 | struct cmd_list_element *c) | |
254 | { | |
d914c394 SS |
255 | if (target_has_execution) |
256 | { | |
257 | observer_mode_1 = observer_mode; | |
258 | error (_("Cannot change this setting while the inferior is running.")); | |
259 | } | |
260 | ||
261 | observer_mode = observer_mode_1; | |
262 | ||
263 | may_write_registers = !observer_mode; | |
264 | may_write_memory = !observer_mode; | |
265 | may_insert_breakpoints = !observer_mode; | |
266 | may_insert_tracepoints = !observer_mode; | |
267 | /* We can insert fast tracepoints in or out of observer mode, | |
268 | but enable them if we're going into this mode. */ | |
269 | if (observer_mode) | |
270 | may_insert_fast_tracepoints = 1; | |
271 | may_stop = !observer_mode; | |
272 | update_target_permissions (); | |
273 | ||
274 | /* Going *into* observer mode we must force non-stop, then | |
275 | going out we leave it that way. */ | |
276 | if (observer_mode) | |
277 | { | |
d914c394 SS |
278 | pagination_enabled = 0; |
279 | non_stop = non_stop_1 = 1; | |
280 | } | |
281 | ||
282 | if (from_tty) | |
283 | printf_filtered (_("Observer mode is now %s.\n"), | |
284 | (observer_mode ? "on" : "off")); | |
285 | } | |
286 | ||
287 | static void | |
288 | show_observer_mode (struct ui_file *file, int from_tty, | |
289 | struct cmd_list_element *c, const char *value) | |
290 | { | |
291 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
292 | } | |
293 | ||
294 | /* This updates the value of observer mode based on changes in | |
295 | permissions. Note that we are deliberately ignoring the values of | |
296 | may-write-registers and may-write-memory, since the user may have | |
297 | reason to enable these during a session, for instance to turn on a | |
298 | debugging-related global. */ | |
299 | ||
300 | void | |
301 | update_observer_mode (void) | |
302 | { | |
303 | int newval; | |
304 | ||
305 | newval = (!may_insert_breakpoints | |
306 | && !may_insert_tracepoints | |
307 | && may_insert_fast_tracepoints | |
308 | && !may_stop | |
309 | && non_stop); | |
310 | ||
311 | /* Let the user know if things change. */ | |
312 | if (newval != observer_mode) | |
313 | printf_filtered (_("Observer mode is now %s.\n"), | |
314 | (newval ? "on" : "off")); | |
315 | ||
316 | observer_mode = observer_mode_1 = newval; | |
317 | } | |
c2c6d25f | 318 | |
c906108c SS |
319 | /* Tables of how to react to signals; the user sets them. */ |
320 | ||
321 | static unsigned char *signal_stop; | |
322 | static unsigned char *signal_print; | |
323 | static unsigned char *signal_program; | |
324 | ||
ab04a2af TT |
325 | /* Table of signals that are registered with "catch signal". A |
326 | non-zero entry indicates that the signal is caught by some "catch | |
327 | signal" command. This has size GDB_SIGNAL_LAST, to accommodate all | |
328 | signals. */ | |
329 | static unsigned char *signal_catch; | |
330 | ||
2455069d UW |
331 | /* Table of signals that the target may silently handle. |
332 | This is automatically determined from the flags above, | |
333 | and simply cached here. */ | |
334 | static unsigned char *signal_pass; | |
335 | ||
c906108c SS |
336 | #define SET_SIGS(nsigs,sigs,flags) \ |
337 | do { \ | |
338 | int signum = (nsigs); \ | |
339 | while (signum-- > 0) \ | |
340 | if ((sigs)[signum]) \ | |
341 | (flags)[signum] = 1; \ | |
342 | } while (0) | |
343 | ||
344 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
345 | do { \ | |
346 | int signum = (nsigs); \ | |
347 | while (signum-- > 0) \ | |
348 | if ((sigs)[signum]) \ | |
349 | (flags)[signum] = 0; \ | |
350 | } while (0) | |
351 | ||
9b224c5e PA |
352 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
353 | this function is to avoid exporting `signal_program'. */ | |
354 | ||
355 | void | |
356 | update_signals_program_target (void) | |
357 | { | |
a493e3e2 | 358 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); |
9b224c5e PA |
359 | } |
360 | ||
1777feb0 | 361 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 362 | |
edb3359d | 363 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
364 | |
365 | /* Command list pointer for the "stop" placeholder. */ | |
366 | ||
367 | static struct cmd_list_element *stop_command; | |
368 | ||
c906108c SS |
369 | /* Nonzero if we want to give control to the user when we're notified |
370 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 371 | int stop_on_solib_events; |
f9e14852 GB |
372 | |
373 | /* Enable or disable optional shared library event breakpoints | |
374 | as appropriate when the above flag is changed. */ | |
375 | ||
376 | static void | |
377 | set_stop_on_solib_events (char *args, int from_tty, struct cmd_list_element *c) | |
378 | { | |
379 | update_solib_breakpoints (); | |
380 | } | |
381 | ||
920d2a44 AC |
382 | static void |
383 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
384 | struct cmd_list_element *c, const char *value) | |
385 | { | |
386 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
387 | value); | |
388 | } | |
c906108c | 389 | |
c906108c SS |
390 | /* Nonzero means expecting a trace trap |
391 | and should stop the inferior and return silently when it happens. */ | |
392 | ||
393 | int stop_after_trap; | |
394 | ||
c906108c SS |
395 | /* Nonzero after stop if current stack frame should be printed. */ |
396 | ||
397 | static int stop_print_frame; | |
398 | ||
e02bc4cc | 399 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
400 | returned by target_wait()/deprecated_target_wait_hook(). This |
401 | information is returned by get_last_target_status(). */ | |
39f77062 | 402 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
403 | static struct target_waitstatus target_last_waitstatus; |
404 | ||
0d1e5fa7 PA |
405 | static void context_switch (ptid_t ptid); |
406 | ||
4e1c45ea | 407 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 408 | |
53904c9e AC |
409 | static const char follow_fork_mode_child[] = "child"; |
410 | static const char follow_fork_mode_parent[] = "parent"; | |
411 | ||
40478521 | 412 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
413 | follow_fork_mode_child, |
414 | follow_fork_mode_parent, | |
415 | NULL | |
ef346e04 | 416 | }; |
c906108c | 417 | |
53904c9e | 418 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
419 | static void |
420 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
421 | struct cmd_list_element *c, const char *value) | |
422 | { | |
3e43a32a MS |
423 | fprintf_filtered (file, |
424 | _("Debugger response to a program " | |
425 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
426 | value); |
427 | } | |
c906108c SS |
428 | \f |
429 | ||
d83ad864 DB |
430 | /* Handle changes to the inferior list based on the type of fork, |
431 | which process is being followed, and whether the other process | |
432 | should be detached. On entry inferior_ptid must be the ptid of | |
433 | the fork parent. At return inferior_ptid is the ptid of the | |
434 | followed inferior. */ | |
435 | ||
436 | static int | |
437 | follow_fork_inferior (int follow_child, int detach_fork) | |
438 | { | |
439 | int has_vforked; | |
79639e11 | 440 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
441 | |
442 | has_vforked = (inferior_thread ()->pending_follow.kind | |
443 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
444 | parent_ptid = inferior_ptid; |
445 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
446 | |
447 | if (has_vforked | |
448 | && !non_stop /* Non-stop always resumes both branches. */ | |
449 | && (!target_is_async_p () || sync_execution) | |
450 | && !(follow_child || detach_fork || sched_multi)) | |
451 | { | |
452 | /* The parent stays blocked inside the vfork syscall until the | |
453 | child execs or exits. If we don't let the child run, then | |
454 | the parent stays blocked. If we're telling the parent to run | |
455 | in the foreground, the user will not be able to ctrl-c to get | |
456 | back the terminal, effectively hanging the debug session. */ | |
457 | fprintf_filtered (gdb_stderr, _("\ | |
458 | Can not resume the parent process over vfork in the foreground while\n\ | |
459 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
460 | \"set schedule-multiple\".\n")); | |
461 | /* FIXME output string > 80 columns. */ | |
462 | return 1; | |
463 | } | |
464 | ||
465 | if (!follow_child) | |
466 | { | |
467 | /* Detach new forked process? */ | |
468 | if (detach_fork) | |
469 | { | |
470 | struct cleanup *old_chain; | |
471 | ||
472 | /* Before detaching from the child, remove all breakpoints | |
473 | from it. If we forked, then this has already been taken | |
474 | care of by infrun.c. If we vforked however, any | |
475 | breakpoint inserted in the parent is visible in the | |
476 | child, even those added while stopped in a vfork | |
477 | catchpoint. This will remove the breakpoints from the | |
478 | parent also, but they'll be reinserted below. */ | |
479 | if (has_vforked) | |
480 | { | |
481 | /* Keep breakpoints list in sync. */ | |
482 | remove_breakpoints_pid (ptid_get_pid (inferior_ptid)); | |
483 | } | |
484 | ||
485 | if (info_verbose || debug_infrun) | |
486 | { | |
8dd06f7a DB |
487 | /* Ensure that we have a process ptid. */ |
488 | ptid_t process_ptid = pid_to_ptid (ptid_get_pid (child_ptid)); | |
489 | ||
6f259a23 | 490 | target_terminal_ours_for_output (); |
d83ad864 | 491 | fprintf_filtered (gdb_stdlog, |
79639e11 | 492 | _("Detaching after %s from child %s.\n"), |
6f259a23 | 493 | has_vforked ? "vfork" : "fork", |
8dd06f7a | 494 | target_pid_to_str (process_ptid)); |
d83ad864 DB |
495 | } |
496 | } | |
497 | else | |
498 | { | |
499 | struct inferior *parent_inf, *child_inf; | |
500 | struct cleanup *old_chain; | |
501 | ||
502 | /* Add process to GDB's tables. */ | |
79639e11 | 503 | child_inf = add_inferior (ptid_get_pid (child_ptid)); |
d83ad864 DB |
504 | |
505 | parent_inf = current_inferior (); | |
506 | child_inf->attach_flag = parent_inf->attach_flag; | |
507 | copy_terminal_info (child_inf, parent_inf); | |
508 | child_inf->gdbarch = parent_inf->gdbarch; | |
509 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
510 | ||
511 | old_chain = save_inferior_ptid (); | |
512 | save_current_program_space (); | |
513 | ||
79639e11 | 514 | inferior_ptid = child_ptid; |
d83ad864 DB |
515 | add_thread (inferior_ptid); |
516 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
517 | ||
518 | /* If this is a vfork child, then the address-space is | |
519 | shared with the parent. */ | |
520 | if (has_vforked) | |
521 | { | |
522 | child_inf->pspace = parent_inf->pspace; | |
523 | child_inf->aspace = parent_inf->aspace; | |
524 | ||
525 | /* The parent will be frozen until the child is done | |
526 | with the shared region. Keep track of the | |
527 | parent. */ | |
528 | child_inf->vfork_parent = parent_inf; | |
529 | child_inf->pending_detach = 0; | |
530 | parent_inf->vfork_child = child_inf; | |
531 | parent_inf->pending_detach = 0; | |
532 | } | |
533 | else | |
534 | { | |
535 | child_inf->aspace = new_address_space (); | |
536 | child_inf->pspace = add_program_space (child_inf->aspace); | |
537 | child_inf->removable = 1; | |
538 | set_current_program_space (child_inf->pspace); | |
539 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
540 | ||
541 | /* Let the shared library layer (e.g., solib-svr4) learn | |
542 | about this new process, relocate the cloned exec, pull | |
543 | in shared libraries, and install the solib event | |
544 | breakpoint. If a "cloned-VM" event was propagated | |
545 | better throughout the core, this wouldn't be | |
546 | required. */ | |
547 | solib_create_inferior_hook (0); | |
548 | } | |
549 | ||
550 | do_cleanups (old_chain); | |
551 | } | |
552 | ||
553 | if (has_vforked) | |
554 | { | |
555 | struct inferior *parent_inf; | |
556 | ||
557 | parent_inf = current_inferior (); | |
558 | ||
559 | /* If we detached from the child, then we have to be careful | |
560 | to not insert breakpoints in the parent until the child | |
561 | is done with the shared memory region. However, if we're | |
562 | staying attached to the child, then we can and should | |
563 | insert breakpoints, so that we can debug it. A | |
564 | subsequent child exec or exit is enough to know when does | |
565 | the child stops using the parent's address space. */ | |
566 | parent_inf->waiting_for_vfork_done = detach_fork; | |
567 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
568 | } | |
569 | } | |
570 | else | |
571 | { | |
572 | /* Follow the child. */ | |
573 | struct inferior *parent_inf, *child_inf; | |
574 | struct program_space *parent_pspace; | |
575 | ||
576 | if (info_verbose || debug_infrun) | |
577 | { | |
6f259a23 DB |
578 | target_terminal_ours_for_output (); |
579 | fprintf_filtered (gdb_stdlog, | |
79639e11 PA |
580 | _("Attaching after %s %s to child %s.\n"), |
581 | target_pid_to_str (parent_ptid), | |
6f259a23 | 582 | has_vforked ? "vfork" : "fork", |
79639e11 | 583 | target_pid_to_str (child_ptid)); |
d83ad864 DB |
584 | } |
585 | ||
586 | /* Add the new inferior first, so that the target_detach below | |
587 | doesn't unpush the target. */ | |
588 | ||
79639e11 | 589 | child_inf = add_inferior (ptid_get_pid (child_ptid)); |
d83ad864 DB |
590 | |
591 | parent_inf = current_inferior (); | |
592 | child_inf->attach_flag = parent_inf->attach_flag; | |
593 | copy_terminal_info (child_inf, parent_inf); | |
594 | child_inf->gdbarch = parent_inf->gdbarch; | |
595 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
596 | ||
597 | parent_pspace = parent_inf->pspace; | |
598 | ||
599 | /* If we're vforking, we want to hold on to the parent until the | |
600 | child exits or execs. At child exec or exit time we can | |
601 | remove the old breakpoints from the parent and detach or | |
602 | resume debugging it. Otherwise, detach the parent now; we'll | |
603 | want to reuse it's program/address spaces, but we can't set | |
604 | them to the child before removing breakpoints from the | |
605 | parent, otherwise, the breakpoints module could decide to | |
606 | remove breakpoints from the wrong process (since they'd be | |
607 | assigned to the same address space). */ | |
608 | ||
609 | if (has_vforked) | |
610 | { | |
611 | gdb_assert (child_inf->vfork_parent == NULL); | |
612 | gdb_assert (parent_inf->vfork_child == NULL); | |
613 | child_inf->vfork_parent = parent_inf; | |
614 | child_inf->pending_detach = 0; | |
615 | parent_inf->vfork_child = child_inf; | |
616 | parent_inf->pending_detach = detach_fork; | |
617 | parent_inf->waiting_for_vfork_done = 0; | |
618 | } | |
619 | else if (detach_fork) | |
6f259a23 DB |
620 | { |
621 | if (info_verbose || debug_infrun) | |
622 | { | |
8dd06f7a DB |
623 | /* Ensure that we have a process ptid. */ |
624 | ptid_t process_ptid = pid_to_ptid (ptid_get_pid (child_ptid)); | |
625 | ||
6f259a23 DB |
626 | target_terminal_ours_for_output (); |
627 | fprintf_filtered (gdb_stdlog, | |
628 | _("Detaching after fork from " | |
79639e11 | 629 | "child %s.\n"), |
8dd06f7a | 630 | target_pid_to_str (process_ptid)); |
6f259a23 DB |
631 | } |
632 | ||
633 | target_detach (NULL, 0); | |
634 | } | |
d83ad864 DB |
635 | |
636 | /* Note that the detach above makes PARENT_INF dangling. */ | |
637 | ||
638 | /* Add the child thread to the appropriate lists, and switch to | |
639 | this new thread, before cloning the program space, and | |
640 | informing the solib layer about this new process. */ | |
641 | ||
79639e11 | 642 | inferior_ptid = child_ptid; |
d83ad864 DB |
643 | add_thread (inferior_ptid); |
644 | ||
645 | /* If this is a vfork child, then the address-space is shared | |
646 | with the parent. If we detached from the parent, then we can | |
647 | reuse the parent's program/address spaces. */ | |
648 | if (has_vforked || detach_fork) | |
649 | { | |
650 | child_inf->pspace = parent_pspace; | |
651 | child_inf->aspace = child_inf->pspace->aspace; | |
652 | } | |
653 | else | |
654 | { | |
655 | child_inf->aspace = new_address_space (); | |
656 | child_inf->pspace = add_program_space (child_inf->aspace); | |
657 | child_inf->removable = 1; | |
658 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
659 | set_current_program_space (child_inf->pspace); | |
660 | clone_program_space (child_inf->pspace, parent_pspace); | |
661 | ||
662 | /* Let the shared library layer (e.g., solib-svr4) learn | |
663 | about this new process, relocate the cloned exec, pull in | |
664 | shared libraries, and install the solib event breakpoint. | |
665 | If a "cloned-VM" event was propagated better throughout | |
666 | the core, this wouldn't be required. */ | |
667 | solib_create_inferior_hook (0); | |
668 | } | |
669 | } | |
670 | ||
671 | return target_follow_fork (follow_child, detach_fork); | |
672 | } | |
673 | ||
e58b0e63 PA |
674 | /* Tell the target to follow the fork we're stopped at. Returns true |
675 | if the inferior should be resumed; false, if the target for some | |
676 | reason decided it's best not to resume. */ | |
677 | ||
6604731b | 678 | static int |
4ef3f3be | 679 | follow_fork (void) |
c906108c | 680 | { |
ea1dd7bc | 681 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
682 | int should_resume = 1; |
683 | struct thread_info *tp; | |
684 | ||
685 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
686 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
687 | parent thread structure's run control related fields, not just these. |
688 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
689 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 690 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
691 | CORE_ADDR step_range_start = 0; |
692 | CORE_ADDR step_range_end = 0; | |
693 | struct frame_id step_frame_id = { 0 }; | |
17b2616c | 694 | struct interp *command_interp = NULL; |
e58b0e63 PA |
695 | |
696 | if (!non_stop) | |
697 | { | |
698 | ptid_t wait_ptid; | |
699 | struct target_waitstatus wait_status; | |
700 | ||
701 | /* Get the last target status returned by target_wait(). */ | |
702 | get_last_target_status (&wait_ptid, &wait_status); | |
703 | ||
704 | /* If not stopped at a fork event, then there's nothing else to | |
705 | do. */ | |
706 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
707 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
708 | return 1; | |
709 | ||
710 | /* Check if we switched over from WAIT_PTID, since the event was | |
711 | reported. */ | |
712 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
713 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
714 | { | |
715 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
716 | target to follow it (in either direction). We'll | |
717 | afterwards refuse to resume, and inform the user what | |
718 | happened. */ | |
719 | switch_to_thread (wait_ptid); | |
720 | should_resume = 0; | |
721 | } | |
722 | } | |
723 | ||
724 | tp = inferior_thread (); | |
725 | ||
726 | /* If there were any forks/vforks that were caught and are now to be | |
727 | followed, then do so now. */ | |
728 | switch (tp->pending_follow.kind) | |
729 | { | |
730 | case TARGET_WAITKIND_FORKED: | |
731 | case TARGET_WAITKIND_VFORKED: | |
732 | { | |
733 | ptid_t parent, child; | |
734 | ||
735 | /* If the user did a next/step, etc, over a fork call, | |
736 | preserve the stepping state in the fork child. */ | |
737 | if (follow_child && should_resume) | |
738 | { | |
8358c15c JK |
739 | step_resume_breakpoint = clone_momentary_breakpoint |
740 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
741 | step_range_start = tp->control.step_range_start; |
742 | step_range_end = tp->control.step_range_end; | |
743 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
744 | exception_resume_breakpoint |
745 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
17b2616c | 746 | command_interp = tp->control.command_interp; |
e58b0e63 PA |
747 | |
748 | /* For now, delete the parent's sr breakpoint, otherwise, | |
749 | parent/child sr breakpoints are considered duplicates, | |
750 | and the child version will not be installed. Remove | |
751 | this when the breakpoints module becomes aware of | |
752 | inferiors and address spaces. */ | |
753 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
754 | tp->control.step_range_start = 0; |
755 | tp->control.step_range_end = 0; | |
756 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 757 | delete_exception_resume_breakpoint (tp); |
17b2616c | 758 | tp->control.command_interp = NULL; |
e58b0e63 PA |
759 | } |
760 | ||
761 | parent = inferior_ptid; | |
762 | child = tp->pending_follow.value.related_pid; | |
763 | ||
d83ad864 DB |
764 | /* Set up inferior(s) as specified by the caller, and tell the |
765 | target to do whatever is necessary to follow either parent | |
766 | or child. */ | |
767 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
768 | { |
769 | /* Target refused to follow, or there's some other reason | |
770 | we shouldn't resume. */ | |
771 | should_resume = 0; | |
772 | } | |
773 | else | |
774 | { | |
775 | /* This pending follow fork event is now handled, one way | |
776 | or another. The previous selected thread may be gone | |
777 | from the lists by now, but if it is still around, need | |
778 | to clear the pending follow request. */ | |
e09875d4 | 779 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
780 | if (tp) |
781 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
782 | ||
783 | /* This makes sure we don't try to apply the "Switched | |
784 | over from WAIT_PID" logic above. */ | |
785 | nullify_last_target_wait_ptid (); | |
786 | ||
1777feb0 | 787 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
788 | if (follow_child) |
789 | { | |
790 | switch_to_thread (child); | |
791 | ||
792 | /* ... and preserve the stepping state, in case the | |
793 | user was stepping over the fork call. */ | |
794 | if (should_resume) | |
795 | { | |
796 | tp = inferior_thread (); | |
8358c15c JK |
797 | tp->control.step_resume_breakpoint |
798 | = step_resume_breakpoint; | |
16c381f0 JK |
799 | tp->control.step_range_start = step_range_start; |
800 | tp->control.step_range_end = step_range_end; | |
801 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
802 | tp->control.exception_resume_breakpoint |
803 | = exception_resume_breakpoint; | |
17b2616c | 804 | tp->control.command_interp = command_interp; |
e58b0e63 PA |
805 | } |
806 | else | |
807 | { | |
808 | /* If we get here, it was because we're trying to | |
809 | resume from a fork catchpoint, but, the user | |
810 | has switched threads away from the thread that | |
811 | forked. In that case, the resume command | |
812 | issued is most likely not applicable to the | |
813 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 814 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 815 | "before following fork child.")); |
e58b0e63 PA |
816 | } |
817 | ||
818 | /* Reset breakpoints in the child as appropriate. */ | |
819 | follow_inferior_reset_breakpoints (); | |
820 | } | |
821 | else | |
822 | switch_to_thread (parent); | |
823 | } | |
824 | } | |
825 | break; | |
826 | case TARGET_WAITKIND_SPURIOUS: | |
827 | /* Nothing to follow. */ | |
828 | break; | |
829 | default: | |
830 | internal_error (__FILE__, __LINE__, | |
831 | "Unexpected pending_follow.kind %d\n", | |
832 | tp->pending_follow.kind); | |
833 | break; | |
834 | } | |
c906108c | 835 | |
e58b0e63 | 836 | return should_resume; |
c906108c SS |
837 | } |
838 | ||
d83ad864 | 839 | static void |
6604731b | 840 | follow_inferior_reset_breakpoints (void) |
c906108c | 841 | { |
4e1c45ea PA |
842 | struct thread_info *tp = inferior_thread (); |
843 | ||
6604731b DJ |
844 | /* Was there a step_resume breakpoint? (There was if the user |
845 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
846 | thread number. Cloned step_resume breakpoints are disabled on |
847 | creation, so enable it here now that it is associated with the | |
848 | correct thread. | |
6604731b DJ |
849 | |
850 | step_resumes are a form of bp that are made to be per-thread. | |
851 | Since we created the step_resume bp when the parent process | |
852 | was being debugged, and now are switching to the child process, | |
853 | from the breakpoint package's viewpoint, that's a switch of | |
854 | "threads". We must update the bp's notion of which thread | |
855 | it is for, or it'll be ignored when it triggers. */ | |
856 | ||
8358c15c | 857 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
858 | { |
859 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
860 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
861 | } | |
6604731b | 862 | |
a1aa2221 | 863 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 864 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
865 | { |
866 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
867 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
868 | } | |
186c406b | 869 | |
6604731b DJ |
870 | /* Reinsert all breakpoints in the child. The user may have set |
871 | breakpoints after catching the fork, in which case those | |
872 | were never set in the child, but only in the parent. This makes | |
873 | sure the inserted breakpoints match the breakpoint list. */ | |
874 | ||
875 | breakpoint_re_set (); | |
876 | insert_breakpoints (); | |
c906108c | 877 | } |
c906108c | 878 | |
6c95b8df PA |
879 | /* The child has exited or execed: resume threads of the parent the |
880 | user wanted to be executing. */ | |
881 | ||
882 | static int | |
883 | proceed_after_vfork_done (struct thread_info *thread, | |
884 | void *arg) | |
885 | { | |
886 | int pid = * (int *) arg; | |
887 | ||
888 | if (ptid_get_pid (thread->ptid) == pid | |
889 | && is_running (thread->ptid) | |
890 | && !is_executing (thread->ptid) | |
891 | && !thread->stop_requested | |
a493e3e2 | 892 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df PA |
893 | { |
894 | if (debug_infrun) | |
895 | fprintf_unfiltered (gdb_stdlog, | |
896 | "infrun: resuming vfork parent thread %s\n", | |
897 | target_pid_to_str (thread->ptid)); | |
898 | ||
899 | switch_to_thread (thread->ptid); | |
70509625 | 900 | clear_proceed_status (0); |
64ce06e4 | 901 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
902 | } |
903 | ||
904 | return 0; | |
905 | } | |
906 | ||
907 | /* Called whenever we notice an exec or exit event, to handle | |
908 | detaching or resuming a vfork parent. */ | |
909 | ||
910 | static void | |
911 | handle_vfork_child_exec_or_exit (int exec) | |
912 | { | |
913 | struct inferior *inf = current_inferior (); | |
914 | ||
915 | if (inf->vfork_parent) | |
916 | { | |
917 | int resume_parent = -1; | |
918 | ||
919 | /* This exec or exit marks the end of the shared memory region | |
920 | between the parent and the child. If the user wanted to | |
921 | detach from the parent, now is the time. */ | |
922 | ||
923 | if (inf->vfork_parent->pending_detach) | |
924 | { | |
925 | struct thread_info *tp; | |
926 | struct cleanup *old_chain; | |
927 | struct program_space *pspace; | |
928 | struct address_space *aspace; | |
929 | ||
1777feb0 | 930 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 931 | |
68c9da30 PA |
932 | inf->vfork_parent->pending_detach = 0; |
933 | ||
f50f4e56 PA |
934 | if (!exec) |
935 | { | |
936 | /* If we're handling a child exit, then inferior_ptid | |
937 | points at the inferior's pid, not to a thread. */ | |
938 | old_chain = save_inferior_ptid (); | |
939 | save_current_program_space (); | |
940 | save_current_inferior (); | |
941 | } | |
942 | else | |
943 | old_chain = save_current_space_and_thread (); | |
6c95b8df PA |
944 | |
945 | /* We're letting loose of the parent. */ | |
946 | tp = any_live_thread_of_process (inf->vfork_parent->pid); | |
947 | switch_to_thread (tp->ptid); | |
948 | ||
949 | /* We're about to detach from the parent, which implicitly | |
950 | removes breakpoints from its address space. There's a | |
951 | catch here: we want to reuse the spaces for the child, | |
952 | but, parent/child are still sharing the pspace at this | |
953 | point, although the exec in reality makes the kernel give | |
954 | the child a fresh set of new pages. The problem here is | |
955 | that the breakpoints module being unaware of this, would | |
956 | likely chose the child process to write to the parent | |
957 | address space. Swapping the child temporarily away from | |
958 | the spaces has the desired effect. Yes, this is "sort | |
959 | of" a hack. */ | |
960 | ||
961 | pspace = inf->pspace; | |
962 | aspace = inf->aspace; | |
963 | inf->aspace = NULL; | |
964 | inf->pspace = NULL; | |
965 | ||
966 | if (debug_infrun || info_verbose) | |
967 | { | |
6f259a23 | 968 | target_terminal_ours_for_output (); |
6c95b8df PA |
969 | |
970 | if (exec) | |
6f259a23 DB |
971 | { |
972 | fprintf_filtered (gdb_stdlog, | |
973 | _("Detaching vfork parent process " | |
974 | "%d after child exec.\n"), | |
975 | inf->vfork_parent->pid); | |
976 | } | |
6c95b8df | 977 | else |
6f259a23 DB |
978 | { |
979 | fprintf_filtered (gdb_stdlog, | |
980 | _("Detaching vfork parent process " | |
981 | "%d after child exit.\n"), | |
982 | inf->vfork_parent->pid); | |
983 | } | |
6c95b8df PA |
984 | } |
985 | ||
986 | target_detach (NULL, 0); | |
987 | ||
988 | /* Put it back. */ | |
989 | inf->pspace = pspace; | |
990 | inf->aspace = aspace; | |
991 | ||
992 | do_cleanups (old_chain); | |
993 | } | |
994 | else if (exec) | |
995 | { | |
996 | /* We're staying attached to the parent, so, really give the | |
997 | child a new address space. */ | |
998 | inf->pspace = add_program_space (maybe_new_address_space ()); | |
999 | inf->aspace = inf->pspace->aspace; | |
1000 | inf->removable = 1; | |
1001 | set_current_program_space (inf->pspace); | |
1002 | ||
1003 | resume_parent = inf->vfork_parent->pid; | |
1004 | ||
1005 | /* Break the bonds. */ | |
1006 | inf->vfork_parent->vfork_child = NULL; | |
1007 | } | |
1008 | else | |
1009 | { | |
1010 | struct cleanup *old_chain; | |
1011 | struct program_space *pspace; | |
1012 | ||
1013 | /* If this is a vfork child exiting, then the pspace and | |
1014 | aspaces were shared with the parent. Since we're | |
1015 | reporting the process exit, we'll be mourning all that is | |
1016 | found in the address space, and switching to null_ptid, | |
1017 | preparing to start a new inferior. But, since we don't | |
1018 | want to clobber the parent's address/program spaces, we | |
1019 | go ahead and create a new one for this exiting | |
1020 | inferior. */ | |
1021 | ||
1022 | /* Switch to null_ptid, so that clone_program_space doesn't want | |
1023 | to read the selected frame of a dead process. */ | |
1024 | old_chain = save_inferior_ptid (); | |
1025 | inferior_ptid = null_ptid; | |
1026 | ||
1027 | /* This inferior is dead, so avoid giving the breakpoints | |
1028 | module the option to write through to it (cloning a | |
1029 | program space resets breakpoints). */ | |
1030 | inf->aspace = NULL; | |
1031 | inf->pspace = NULL; | |
1032 | pspace = add_program_space (maybe_new_address_space ()); | |
1033 | set_current_program_space (pspace); | |
1034 | inf->removable = 1; | |
7dcd53a0 | 1035 | inf->symfile_flags = SYMFILE_NO_READ; |
6c95b8df PA |
1036 | clone_program_space (pspace, inf->vfork_parent->pspace); |
1037 | inf->pspace = pspace; | |
1038 | inf->aspace = pspace->aspace; | |
1039 | ||
1040 | /* Put back inferior_ptid. We'll continue mourning this | |
1777feb0 | 1041 | inferior. */ |
6c95b8df PA |
1042 | do_cleanups (old_chain); |
1043 | ||
1044 | resume_parent = inf->vfork_parent->pid; | |
1045 | /* Break the bonds. */ | |
1046 | inf->vfork_parent->vfork_child = NULL; | |
1047 | } | |
1048 | ||
1049 | inf->vfork_parent = NULL; | |
1050 | ||
1051 | gdb_assert (current_program_space == inf->pspace); | |
1052 | ||
1053 | if (non_stop && resume_parent != -1) | |
1054 | { | |
1055 | /* If the user wanted the parent to be running, let it go | |
1056 | free now. */ | |
1057 | struct cleanup *old_chain = make_cleanup_restore_current_thread (); | |
1058 | ||
1059 | if (debug_infrun) | |
3e43a32a MS |
1060 | fprintf_unfiltered (gdb_stdlog, |
1061 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
1062 | resume_parent); |
1063 | ||
1064 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
1065 | ||
1066 | do_cleanups (old_chain); | |
1067 | } | |
1068 | } | |
1069 | } | |
1070 | ||
eb6c553b | 1071 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1072 | |
1073 | static const char follow_exec_mode_new[] = "new"; | |
1074 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1075 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1076 | { |
1077 | follow_exec_mode_new, | |
1078 | follow_exec_mode_same, | |
1079 | NULL, | |
1080 | }; | |
1081 | ||
1082 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1083 | static void | |
1084 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1085 | struct cmd_list_element *c, const char *value) | |
1086 | { | |
1087 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1088 | } | |
1089 | ||
1777feb0 | 1090 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
1adeb98a | 1091 | |
c906108c | 1092 | static void |
95e50b27 | 1093 | follow_exec (ptid_t ptid, char *execd_pathname) |
c906108c | 1094 | { |
95e50b27 | 1095 | struct thread_info *th, *tmp; |
6c95b8df | 1096 | struct inferior *inf = current_inferior (); |
95e50b27 | 1097 | int pid = ptid_get_pid (ptid); |
7a292a7a | 1098 | |
c906108c SS |
1099 | /* This is an exec event that we actually wish to pay attention to. |
1100 | Refresh our symbol table to the newly exec'd program, remove any | |
1101 | momentary bp's, etc. | |
1102 | ||
1103 | If there are breakpoints, they aren't really inserted now, | |
1104 | since the exec() transformed our inferior into a fresh set | |
1105 | of instructions. | |
1106 | ||
1107 | We want to preserve symbolic breakpoints on the list, since | |
1108 | we have hopes that they can be reset after the new a.out's | |
1109 | symbol table is read. | |
1110 | ||
1111 | However, any "raw" breakpoints must be removed from the list | |
1112 | (e.g., the solib bp's), since their address is probably invalid | |
1113 | now. | |
1114 | ||
1115 | And, we DON'T want to call delete_breakpoints() here, since | |
1116 | that may write the bp's "shadow contents" (the instruction | |
1117 | value that was overwritten witha TRAP instruction). Since | |
1777feb0 | 1118 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1119 | |
1120 | mark_breakpoints_out (); | |
1121 | ||
95e50b27 PA |
1122 | /* The target reports the exec event to the main thread, even if |
1123 | some other thread does the exec, and even if the main thread was | |
1124 | stopped or already gone. We may still have non-leader threads of | |
1125 | the process on our list. E.g., on targets that don't have thread | |
1126 | exit events (like remote); or on native Linux in non-stop mode if | |
1127 | there were only two threads in the inferior and the non-leader | |
1128 | one is the one that execs (and nothing forces an update of the | |
1129 | thread list up to here). When debugging remotely, it's best to | |
1130 | avoid extra traffic, when possible, so avoid syncing the thread | |
1131 | list with the target, and instead go ahead and delete all threads | |
1132 | of the process but one that reported the event. Note this must | |
1133 | be done before calling update_breakpoints_after_exec, as | |
1134 | otherwise clearing the threads' resources would reference stale | |
1135 | thread breakpoints -- it may have been one of these threads that | |
1136 | stepped across the exec. We could just clear their stepping | |
1137 | states, but as long as we're iterating, might as well delete | |
1138 | them. Deleting them now rather than at the next user-visible | |
1139 | stop provides a nicer sequence of events for user and MI | |
1140 | notifications. */ | |
8a06aea7 | 1141 | ALL_THREADS_SAFE (th, tmp) |
95e50b27 PA |
1142 | if (ptid_get_pid (th->ptid) == pid && !ptid_equal (th->ptid, ptid)) |
1143 | delete_thread (th->ptid); | |
1144 | ||
1145 | /* We also need to clear any left over stale state for the | |
1146 | leader/event thread. E.g., if there was any step-resume | |
1147 | breakpoint or similar, it's gone now. We cannot truly | |
1148 | step-to-next statement through an exec(). */ | |
1149 | th = inferior_thread (); | |
8358c15c | 1150 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1151 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1152 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1153 | th->control.step_range_start = 0; |
1154 | th->control.step_range_end = 0; | |
c906108c | 1155 | |
95e50b27 PA |
1156 | /* The user may have had the main thread held stopped in the |
1157 | previous image (e.g., schedlock on, or non-stop). Release | |
1158 | it now. */ | |
a75724bc PA |
1159 | th->stop_requested = 0; |
1160 | ||
95e50b27 PA |
1161 | update_breakpoints_after_exec (); |
1162 | ||
1777feb0 | 1163 | /* What is this a.out's name? */ |
6c95b8df PA |
1164 | printf_unfiltered (_("%s is executing new program: %s\n"), |
1165 | target_pid_to_str (inferior_ptid), | |
1166 | execd_pathname); | |
c906108c SS |
1167 | |
1168 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1169 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1170 | |
c906108c | 1171 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
1172 | |
1173 | breakpoint_init_inferior (inf_execd); | |
e85a822c | 1174 | |
a3be80c3 | 1175 | if (*gdb_sysroot != '\0') |
e85a822c | 1176 | { |
998d2a3e | 1177 | char *name = exec_file_find (execd_pathname, NULL); |
ff862be4 GB |
1178 | |
1179 | execd_pathname = alloca (strlen (name) + 1); | |
1180 | strcpy (execd_pathname, name); | |
1181 | xfree (name); | |
e85a822c | 1182 | } |
c906108c | 1183 | |
cce9b6bf PA |
1184 | /* Reset the shared library package. This ensures that we get a |
1185 | shlib event when the child reaches "_start", at which point the | |
1186 | dld will have had a chance to initialize the child. */ | |
1187 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1188 | we don't want those to be satisfied by the libraries of the | |
1189 | previous incarnation of this process. */ | |
1190 | no_shared_libraries (NULL, 0); | |
1191 | ||
6c95b8df PA |
1192 | if (follow_exec_mode_string == follow_exec_mode_new) |
1193 | { | |
1194 | struct program_space *pspace; | |
6c95b8df PA |
1195 | |
1196 | /* The user wants to keep the old inferior and program spaces | |
1197 | around. Create a new fresh one, and switch to it. */ | |
1198 | ||
17d8546e DB |
1199 | /* Do exit processing for the original inferior before adding |
1200 | the new inferior so we don't have two active inferiors with | |
1201 | the same ptid, which can confuse find_inferior_ptid. */ | |
1202 | exit_inferior_num_silent (current_inferior ()->num); | |
1203 | ||
1204 | inf = add_inferior (pid); | |
6c95b8df PA |
1205 | pspace = add_program_space (maybe_new_address_space ()); |
1206 | inf->pspace = pspace; | |
1207 | inf->aspace = pspace->aspace; | |
17d8546e | 1208 | add_thread (ptid); |
6c95b8df PA |
1209 | |
1210 | set_current_inferior (inf); | |
1211 | set_current_program_space (pspace); | |
1212 | } | |
9107fc8d PA |
1213 | else |
1214 | { | |
1215 | /* The old description may no longer be fit for the new image. | |
1216 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1217 | old description; we'll read a new one below. No need to do | |
1218 | this on "follow-exec-mode new", as the old inferior stays | |
1219 | around (its description is later cleared/refetched on | |
1220 | restart). */ | |
1221 | target_clear_description (); | |
1222 | } | |
6c95b8df PA |
1223 | |
1224 | gdb_assert (current_program_space == inf->pspace); | |
1225 | ||
1777feb0 | 1226 | /* That a.out is now the one to use. */ |
6c95b8df PA |
1227 | exec_file_attach (execd_pathname, 0); |
1228 | ||
c1e56572 JK |
1229 | /* SYMFILE_DEFER_BP_RESET is used as the proper displacement for PIE |
1230 | (Position Independent Executable) main symbol file will get applied by | |
1231 | solib_create_inferior_hook below. breakpoint_re_set would fail to insert | |
1232 | the breakpoints with the zero displacement. */ | |
1233 | ||
7dcd53a0 TT |
1234 | symbol_file_add (execd_pathname, |
1235 | (inf->symfile_flags | |
1236 | | SYMFILE_MAINLINE | SYMFILE_DEFER_BP_RESET), | |
c1e56572 JK |
1237 | NULL, 0); |
1238 | ||
7dcd53a0 TT |
1239 | if ((inf->symfile_flags & SYMFILE_NO_READ) == 0) |
1240 | set_initial_language (); | |
c906108c | 1241 | |
9107fc8d PA |
1242 | /* If the target can specify a description, read it. Must do this |
1243 | after flipping to the new executable (because the target supplied | |
1244 | description must be compatible with the executable's | |
1245 | architecture, and the old executable may e.g., be 32-bit, while | |
1246 | the new one 64-bit), and before anything involving memory or | |
1247 | registers. */ | |
1248 | target_find_description (); | |
1249 | ||
268a4a75 | 1250 | solib_create_inferior_hook (0); |
c906108c | 1251 | |
4efc6507 DE |
1252 | jit_inferior_created_hook (); |
1253 | ||
c1e56572 JK |
1254 | breakpoint_re_set (); |
1255 | ||
c906108c SS |
1256 | /* Reinsert all breakpoints. (Those which were symbolic have |
1257 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1258 | to symbol_file_command...). */ |
c906108c SS |
1259 | insert_breakpoints (); |
1260 | ||
1261 | /* The next resume of this inferior should bring it to the shlib | |
1262 | startup breakpoints. (If the user had also set bp's on | |
1263 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1264 | matically get reset there in the new process.). */ |
c906108c SS |
1265 | } |
1266 | ||
c2829269 PA |
1267 | /* The queue of threads that need to do a step-over operation to get |
1268 | past e.g., a breakpoint. What technique is used to step over the | |
1269 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1270 | same queue, to maintain rough temporal order of execution, in order | |
1271 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1272 | constantly stepping the same couple threads past their breakpoints | |
1273 | over and over, if the single-step finish fast enough. */ | |
1274 | struct thread_info *step_over_queue_head; | |
1275 | ||
6c4cfb24 PA |
1276 | /* Bit flags indicating what the thread needs to step over. */ |
1277 | ||
1278 | enum step_over_what | |
1279 | { | |
1280 | /* Step over a breakpoint. */ | |
1281 | STEP_OVER_BREAKPOINT = 1, | |
1282 | ||
1283 | /* Step past a non-continuable watchpoint, in order to let the | |
1284 | instruction execute so we can evaluate the watchpoint | |
1285 | expression. */ | |
1286 | STEP_OVER_WATCHPOINT = 2 | |
1287 | }; | |
1288 | ||
963f9c80 | 1289 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1290 | |
1291 | struct step_over_info | |
1292 | { | |
963f9c80 PA |
1293 | /* If we're stepping past a breakpoint, this is the address space |
1294 | and address of the instruction the breakpoint is set at. We'll | |
1295 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1296 | non-NULL. */ | |
31e77af2 | 1297 | struct address_space *aspace; |
31e77af2 | 1298 | CORE_ADDR address; |
963f9c80 PA |
1299 | |
1300 | /* The instruction being stepped over triggers a nonsteppable | |
1301 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1302 | int nonsteppable_watchpoint_p; | |
31e77af2 PA |
1303 | }; |
1304 | ||
1305 | /* The step-over info of the location that is being stepped over. | |
1306 | ||
1307 | Note that with async/breakpoint always-inserted mode, a user might | |
1308 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1309 | being stepped over. As setting a new breakpoint inserts all | |
1310 | breakpoints, we need to make sure the breakpoint being stepped over | |
1311 | isn't inserted then. We do that by only clearing the step-over | |
1312 | info when the step-over is actually finished (or aborted). | |
1313 | ||
1314 | Presently GDB can only step over one breakpoint at any given time. | |
1315 | Given threads that can't run code in the same address space as the | |
1316 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1317 | to step-over at most one breakpoint per address space (so this info | |
1318 | could move to the address space object if/when GDB is extended). | |
1319 | The set of breakpoints being stepped over will normally be much | |
1320 | smaller than the set of all breakpoints, so a flag in the | |
1321 | breakpoint location structure would be wasteful. A separate list | |
1322 | also saves complexity and run-time, as otherwise we'd have to go | |
1323 | through all breakpoint locations clearing their flag whenever we | |
1324 | start a new sequence. Similar considerations weigh against storing | |
1325 | this info in the thread object. Plus, not all step overs actually | |
1326 | have breakpoint locations -- e.g., stepping past a single-step | |
1327 | breakpoint, or stepping to complete a non-continuable | |
1328 | watchpoint. */ | |
1329 | static struct step_over_info step_over_info; | |
1330 | ||
1331 | /* Record the address of the breakpoint/instruction we're currently | |
1332 | stepping over. */ | |
1333 | ||
1334 | static void | |
963f9c80 PA |
1335 | set_step_over_info (struct address_space *aspace, CORE_ADDR address, |
1336 | int nonsteppable_watchpoint_p) | |
31e77af2 PA |
1337 | { |
1338 | step_over_info.aspace = aspace; | |
1339 | step_over_info.address = address; | |
963f9c80 | 1340 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
31e77af2 PA |
1341 | } |
1342 | ||
1343 | /* Called when we're not longer stepping over a breakpoint / an | |
1344 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1345 | ||
1346 | static void | |
1347 | clear_step_over_info (void) | |
1348 | { | |
372316f1 PA |
1349 | if (debug_infrun) |
1350 | fprintf_unfiltered (gdb_stdlog, | |
1351 | "infrun: clear_step_over_info\n"); | |
31e77af2 PA |
1352 | step_over_info.aspace = NULL; |
1353 | step_over_info.address = 0; | |
963f9c80 | 1354 | step_over_info.nonsteppable_watchpoint_p = 0; |
31e77af2 PA |
1355 | } |
1356 | ||
7f89fd65 | 1357 | /* See infrun.h. */ |
31e77af2 PA |
1358 | |
1359 | int | |
1360 | stepping_past_instruction_at (struct address_space *aspace, | |
1361 | CORE_ADDR address) | |
1362 | { | |
1363 | return (step_over_info.aspace != NULL | |
1364 | && breakpoint_address_match (aspace, address, | |
1365 | step_over_info.aspace, | |
1366 | step_over_info.address)); | |
1367 | } | |
1368 | ||
963f9c80 PA |
1369 | /* See infrun.h. */ |
1370 | ||
1371 | int | |
1372 | stepping_past_nonsteppable_watchpoint (void) | |
1373 | { | |
1374 | return step_over_info.nonsteppable_watchpoint_p; | |
1375 | } | |
1376 | ||
6cc83d2a PA |
1377 | /* Returns true if step-over info is valid. */ |
1378 | ||
1379 | static int | |
1380 | step_over_info_valid_p (void) | |
1381 | { | |
963f9c80 PA |
1382 | return (step_over_info.aspace != NULL |
1383 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1384 | } |
1385 | ||
c906108c | 1386 | \f |
237fc4c9 PA |
1387 | /* Displaced stepping. */ |
1388 | ||
1389 | /* In non-stop debugging mode, we must take special care to manage | |
1390 | breakpoints properly; in particular, the traditional strategy for | |
1391 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1392 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1393 | breakpoint it has hit while ensuring that other threads running | |
1394 | concurrently will hit the breakpoint as they should. | |
1395 | ||
1396 | The traditional way to step a thread T off a breakpoint in a | |
1397 | multi-threaded program in all-stop mode is as follows: | |
1398 | ||
1399 | a0) Initially, all threads are stopped, and breakpoints are not | |
1400 | inserted. | |
1401 | a1) We single-step T, leaving breakpoints uninserted. | |
1402 | a2) We insert breakpoints, and resume all threads. | |
1403 | ||
1404 | In non-stop debugging, however, this strategy is unsuitable: we | |
1405 | don't want to have to stop all threads in the system in order to | |
1406 | continue or step T past a breakpoint. Instead, we use displaced | |
1407 | stepping: | |
1408 | ||
1409 | n0) Initially, T is stopped, other threads are running, and | |
1410 | breakpoints are inserted. | |
1411 | n1) We copy the instruction "under" the breakpoint to a separate | |
1412 | location, outside the main code stream, making any adjustments | |
1413 | to the instruction, register, and memory state as directed by | |
1414 | T's architecture. | |
1415 | n2) We single-step T over the instruction at its new location. | |
1416 | n3) We adjust the resulting register and memory state as directed | |
1417 | by T's architecture. This includes resetting T's PC to point | |
1418 | back into the main instruction stream. | |
1419 | n4) We resume T. | |
1420 | ||
1421 | This approach depends on the following gdbarch methods: | |
1422 | ||
1423 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1424 | indicate where to copy the instruction, and how much space must | |
1425 | be reserved there. We use these in step n1. | |
1426 | ||
1427 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1428 | address, and makes any necessary adjustments to the instruction, | |
1429 | register contents, and memory. We use this in step n1. | |
1430 | ||
1431 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
1432 | we have successfuly single-stepped the instruction, to yield the | |
1433 | same effect the instruction would have had if we had executed it | |
1434 | at its original address. We use this in step n3. | |
1435 | ||
1436 | - gdbarch_displaced_step_free_closure provides cleanup. | |
1437 | ||
1438 | The gdbarch_displaced_step_copy_insn and | |
1439 | gdbarch_displaced_step_fixup functions must be written so that | |
1440 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1441 | single-stepping across the copied instruction, and then applying | |
1442 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1443 | thread's memory and registers as stepping the instruction in place | |
1444 | would have. Exactly which responsibilities fall to the copy and | |
1445 | which fall to the fixup is up to the author of those functions. | |
1446 | ||
1447 | See the comments in gdbarch.sh for details. | |
1448 | ||
1449 | Note that displaced stepping and software single-step cannot | |
1450 | currently be used in combination, although with some care I think | |
1451 | they could be made to. Software single-step works by placing | |
1452 | breakpoints on all possible subsequent instructions; if the | |
1453 | displaced instruction is a PC-relative jump, those breakpoints | |
1454 | could fall in very strange places --- on pages that aren't | |
1455 | executable, or at addresses that are not proper instruction | |
1456 | boundaries. (We do generally let other threads run while we wait | |
1457 | to hit the software single-step breakpoint, and they might | |
1458 | encounter such a corrupted instruction.) One way to work around | |
1459 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1460 | simulate the effect of PC-relative instructions (and return NULL) | |
1461 | on architectures that use software single-stepping. | |
1462 | ||
1463 | In non-stop mode, we can have independent and simultaneous step | |
1464 | requests, so more than one thread may need to simultaneously step | |
1465 | over a breakpoint. The current implementation assumes there is | |
1466 | only one scratch space per process. In this case, we have to | |
1467 | serialize access to the scratch space. If thread A wants to step | |
1468 | over a breakpoint, but we are currently waiting for some other | |
1469 | thread to complete a displaced step, we leave thread A stopped and | |
1470 | place it in the displaced_step_request_queue. Whenever a displaced | |
1471 | step finishes, we pick the next thread in the queue and start a new | |
1472 | displaced step operation on it. See displaced_step_prepare and | |
1473 | displaced_step_fixup for details. */ | |
1474 | ||
fc1cf338 PA |
1475 | /* Per-inferior displaced stepping state. */ |
1476 | struct displaced_step_inferior_state | |
1477 | { | |
1478 | /* Pointer to next in linked list. */ | |
1479 | struct displaced_step_inferior_state *next; | |
1480 | ||
1481 | /* The process this displaced step state refers to. */ | |
1482 | int pid; | |
1483 | ||
3fc8eb30 PA |
1484 | /* True if preparing a displaced step ever failed. If so, we won't |
1485 | try displaced stepping for this inferior again. */ | |
1486 | int failed_before; | |
1487 | ||
fc1cf338 PA |
1488 | /* If this is not null_ptid, this is the thread carrying out a |
1489 | displaced single-step in process PID. This thread's state will | |
1490 | require fixing up once it has completed its step. */ | |
1491 | ptid_t step_ptid; | |
1492 | ||
1493 | /* The architecture the thread had when we stepped it. */ | |
1494 | struct gdbarch *step_gdbarch; | |
1495 | ||
1496 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
1497 | for post-step cleanup. */ | |
1498 | struct displaced_step_closure *step_closure; | |
1499 | ||
1500 | /* The address of the original instruction, and the copy we | |
1501 | made. */ | |
1502 | CORE_ADDR step_original, step_copy; | |
1503 | ||
1504 | /* Saved contents of copy area. */ | |
1505 | gdb_byte *step_saved_copy; | |
1506 | }; | |
1507 | ||
1508 | /* The list of states of processes involved in displaced stepping | |
1509 | presently. */ | |
1510 | static struct displaced_step_inferior_state *displaced_step_inferior_states; | |
1511 | ||
1512 | /* Get the displaced stepping state of process PID. */ | |
1513 | ||
1514 | static struct displaced_step_inferior_state * | |
1515 | get_displaced_stepping_state (int pid) | |
1516 | { | |
1517 | struct displaced_step_inferior_state *state; | |
1518 | ||
1519 | for (state = displaced_step_inferior_states; | |
1520 | state != NULL; | |
1521 | state = state->next) | |
1522 | if (state->pid == pid) | |
1523 | return state; | |
1524 | ||
1525 | return NULL; | |
1526 | } | |
1527 | ||
372316f1 PA |
1528 | /* Returns true if any inferior has a thread doing a displaced |
1529 | step. */ | |
1530 | ||
1531 | static int | |
1532 | displaced_step_in_progress_any_inferior (void) | |
1533 | { | |
1534 | struct displaced_step_inferior_state *state; | |
1535 | ||
1536 | for (state = displaced_step_inferior_states; | |
1537 | state != NULL; | |
1538 | state = state->next) | |
1539 | if (!ptid_equal (state->step_ptid, null_ptid)) | |
1540 | return 1; | |
1541 | ||
1542 | return 0; | |
1543 | } | |
1544 | ||
8f572e5c PA |
1545 | /* Return true if process PID has a thread doing a displaced step. */ |
1546 | ||
1547 | static int | |
1548 | displaced_step_in_progress (int pid) | |
1549 | { | |
1550 | struct displaced_step_inferior_state *displaced; | |
1551 | ||
1552 | displaced = get_displaced_stepping_state (pid); | |
1553 | if (displaced != NULL && !ptid_equal (displaced->step_ptid, null_ptid)) | |
1554 | return 1; | |
1555 | ||
1556 | return 0; | |
1557 | } | |
1558 | ||
fc1cf338 PA |
1559 | /* Add a new displaced stepping state for process PID to the displaced |
1560 | stepping state list, or return a pointer to an already existing | |
1561 | entry, if it already exists. Never returns NULL. */ | |
1562 | ||
1563 | static struct displaced_step_inferior_state * | |
1564 | add_displaced_stepping_state (int pid) | |
1565 | { | |
1566 | struct displaced_step_inferior_state *state; | |
1567 | ||
1568 | for (state = displaced_step_inferior_states; | |
1569 | state != NULL; | |
1570 | state = state->next) | |
1571 | if (state->pid == pid) | |
1572 | return state; | |
237fc4c9 | 1573 | |
8d749320 | 1574 | state = XCNEW (struct displaced_step_inferior_state); |
fc1cf338 PA |
1575 | state->pid = pid; |
1576 | state->next = displaced_step_inferior_states; | |
1577 | displaced_step_inferior_states = state; | |
237fc4c9 | 1578 | |
fc1cf338 PA |
1579 | return state; |
1580 | } | |
1581 | ||
a42244db YQ |
1582 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1583 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1584 | return NULL. */ | |
1585 | ||
1586 | struct displaced_step_closure* | |
1587 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1588 | { | |
1589 | struct displaced_step_inferior_state *displaced | |
1590 | = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); | |
1591 | ||
1592 | /* If checking the mode of displaced instruction in copy area. */ | |
1593 | if (displaced && !ptid_equal (displaced->step_ptid, null_ptid) | |
1594 | && (displaced->step_copy == addr)) | |
1595 | return displaced->step_closure; | |
1596 | ||
1597 | return NULL; | |
1598 | } | |
1599 | ||
fc1cf338 | 1600 | /* Remove the displaced stepping state of process PID. */ |
237fc4c9 | 1601 | |
fc1cf338 PA |
1602 | static void |
1603 | remove_displaced_stepping_state (int pid) | |
1604 | { | |
1605 | struct displaced_step_inferior_state *it, **prev_next_p; | |
237fc4c9 | 1606 | |
fc1cf338 PA |
1607 | gdb_assert (pid != 0); |
1608 | ||
1609 | it = displaced_step_inferior_states; | |
1610 | prev_next_p = &displaced_step_inferior_states; | |
1611 | while (it) | |
1612 | { | |
1613 | if (it->pid == pid) | |
1614 | { | |
1615 | *prev_next_p = it->next; | |
1616 | xfree (it); | |
1617 | return; | |
1618 | } | |
1619 | ||
1620 | prev_next_p = &it->next; | |
1621 | it = *prev_next_p; | |
1622 | } | |
1623 | } | |
1624 | ||
1625 | static void | |
1626 | infrun_inferior_exit (struct inferior *inf) | |
1627 | { | |
1628 | remove_displaced_stepping_state (inf->pid); | |
1629 | } | |
237fc4c9 | 1630 | |
fff08868 HZ |
1631 | /* If ON, and the architecture supports it, GDB will use displaced |
1632 | stepping to step over breakpoints. If OFF, or if the architecture | |
1633 | doesn't support it, GDB will instead use the traditional | |
1634 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1635 | decide which technique to use to step over breakpoints depending on | |
1636 | which of all-stop or non-stop mode is active --- displaced stepping | |
1637 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1638 | ||
72d0e2c5 | 1639 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1640 | |
237fc4c9 PA |
1641 | static void |
1642 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1643 | struct cmd_list_element *c, | |
1644 | const char *value) | |
1645 | { | |
72d0e2c5 | 1646 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1647 | fprintf_filtered (file, |
1648 | _("Debugger's willingness to use displaced stepping " | |
1649 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1650 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1651 | else |
3e43a32a MS |
1652 | fprintf_filtered (file, |
1653 | _("Debugger's willingness to use displaced stepping " | |
1654 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1655 | } |
1656 | ||
fff08868 | 1657 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1658 | over breakpoints of thread TP. */ |
fff08868 | 1659 | |
237fc4c9 | 1660 | static int |
3fc8eb30 | 1661 | use_displaced_stepping (struct thread_info *tp) |
237fc4c9 | 1662 | { |
3fc8eb30 PA |
1663 | struct regcache *regcache = get_thread_regcache (tp->ptid); |
1664 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1665 | struct displaced_step_inferior_state *displaced_state; | |
1666 | ||
1667 | displaced_state = get_displaced_stepping_state (ptid_get_pid (tp->ptid)); | |
1668 | ||
fbea99ea PA |
1669 | return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO |
1670 | && target_is_non_stop_p ()) | |
72d0e2c5 | 1671 | || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) |
96429cc8 | 1672 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
3fc8eb30 PA |
1673 | && find_record_target () == NULL |
1674 | && (displaced_state == NULL | |
1675 | || !displaced_state->failed_before)); | |
237fc4c9 PA |
1676 | } |
1677 | ||
1678 | /* Clean out any stray displaced stepping state. */ | |
1679 | static void | |
fc1cf338 | 1680 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1681 | { |
1682 | /* Indicate that there is no cleanup pending. */ | |
fc1cf338 | 1683 | displaced->step_ptid = null_ptid; |
237fc4c9 | 1684 | |
fc1cf338 | 1685 | if (displaced->step_closure) |
237fc4c9 | 1686 | { |
fc1cf338 PA |
1687 | gdbarch_displaced_step_free_closure (displaced->step_gdbarch, |
1688 | displaced->step_closure); | |
1689 | displaced->step_closure = NULL; | |
237fc4c9 PA |
1690 | } |
1691 | } | |
1692 | ||
1693 | static void | |
fc1cf338 | 1694 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1695 | { |
fc1cf338 PA |
1696 | struct displaced_step_inferior_state *state = arg; |
1697 | ||
1698 | displaced_step_clear (state); | |
237fc4c9 PA |
1699 | } |
1700 | ||
1701 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1702 | void | |
1703 | displaced_step_dump_bytes (struct ui_file *file, | |
1704 | const gdb_byte *buf, | |
1705 | size_t len) | |
1706 | { | |
1707 | int i; | |
1708 | ||
1709 | for (i = 0; i < len; i++) | |
1710 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1711 | fputs_unfiltered ("\n", file); | |
1712 | } | |
1713 | ||
1714 | /* Prepare to single-step, using displaced stepping. | |
1715 | ||
1716 | Note that we cannot use displaced stepping when we have a signal to | |
1717 | deliver. If we have a signal to deliver and an instruction to step | |
1718 | over, then after the step, there will be no indication from the | |
1719 | target whether the thread entered a signal handler or ignored the | |
1720 | signal and stepped over the instruction successfully --- both cases | |
1721 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1722 | fixup, and in the second case we must --- but we can't tell which. | |
1723 | Comments in the code for 'random signals' in handle_inferior_event | |
1724 | explain how we handle this case instead. | |
1725 | ||
1726 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1727 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1728 | if this instruction can't be displaced stepped. */ | |
1729 | ||
237fc4c9 | 1730 | static int |
3fc8eb30 | 1731 | displaced_step_prepare_throw (ptid_t ptid) |
237fc4c9 | 1732 | { |
ad53cd71 | 1733 | struct cleanup *old_cleanups, *ignore_cleanups; |
c1e36e3e | 1734 | struct thread_info *tp = find_thread_ptid (ptid); |
237fc4c9 PA |
1735 | struct regcache *regcache = get_thread_regcache (ptid); |
1736 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1737 | CORE_ADDR original, copy; | |
1738 | ULONGEST len; | |
1739 | struct displaced_step_closure *closure; | |
fc1cf338 | 1740 | struct displaced_step_inferior_state *displaced; |
9e529e1d | 1741 | int status; |
237fc4c9 PA |
1742 | |
1743 | /* We should never reach this function if the architecture does not | |
1744 | support displaced stepping. */ | |
1745 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1746 | ||
c2829269 PA |
1747 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1748 | gdb_assert (tp->control.trap_expected); | |
1749 | ||
c1e36e3e PA |
1750 | /* Disable range stepping while executing in the scratch pad. We |
1751 | want a single-step even if executing the displaced instruction in | |
1752 | the scratch buffer lands within the stepping range (e.g., a | |
1753 | jump/branch). */ | |
1754 | tp->control.may_range_step = 0; | |
1755 | ||
fc1cf338 PA |
1756 | /* We have to displaced step one thread at a time, as we only have |
1757 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1758 | |
fc1cf338 PA |
1759 | displaced = add_displaced_stepping_state (ptid_get_pid (ptid)); |
1760 | ||
1761 | if (!ptid_equal (displaced->step_ptid, null_ptid)) | |
237fc4c9 PA |
1762 | { |
1763 | /* Already waiting for a displaced step to finish. Defer this | |
1764 | request and place in queue. */ | |
237fc4c9 PA |
1765 | |
1766 | if (debug_displaced) | |
1767 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1768 | "displaced: deferring step of %s\n", |
237fc4c9 PA |
1769 | target_pid_to_str (ptid)); |
1770 | ||
c2829269 | 1771 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1772 | return 0; |
1773 | } | |
1774 | else | |
1775 | { | |
1776 | if (debug_displaced) | |
1777 | fprintf_unfiltered (gdb_stdlog, | |
1778 | "displaced: stepping %s now\n", | |
1779 | target_pid_to_str (ptid)); | |
1780 | } | |
1781 | ||
fc1cf338 | 1782 | displaced_step_clear (displaced); |
237fc4c9 | 1783 | |
ad53cd71 PA |
1784 | old_cleanups = save_inferior_ptid (); |
1785 | inferior_ptid = ptid; | |
1786 | ||
515630c5 | 1787 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1788 | |
1789 | copy = gdbarch_displaced_step_location (gdbarch); | |
1790 | len = gdbarch_max_insn_length (gdbarch); | |
1791 | ||
1792 | /* Save the original contents of the copy area. */ | |
fc1cf338 | 1793 | displaced->step_saved_copy = xmalloc (len); |
ad53cd71 | 1794 | ignore_cleanups = make_cleanup (free_current_contents, |
fc1cf338 | 1795 | &displaced->step_saved_copy); |
9e529e1d JK |
1796 | status = target_read_memory (copy, displaced->step_saved_copy, len); |
1797 | if (status != 0) | |
1798 | throw_error (MEMORY_ERROR, | |
1799 | _("Error accessing memory address %s (%s) for " | |
1800 | "displaced-stepping scratch space."), | |
1801 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1802 | if (debug_displaced) |
1803 | { | |
5af949e3 UW |
1804 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1805 | paddress (gdbarch, copy)); | |
fc1cf338 PA |
1806 | displaced_step_dump_bytes (gdb_stdlog, |
1807 | displaced->step_saved_copy, | |
1808 | len); | |
237fc4c9 PA |
1809 | }; |
1810 | ||
1811 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1812 | original, copy, regcache); |
7f03bd92 PA |
1813 | if (closure == NULL) |
1814 | { | |
1815 | /* The architecture doesn't know how or want to displaced step | |
1816 | this instruction or instruction sequence. Fallback to | |
1817 | stepping over the breakpoint in-line. */ | |
1818 | do_cleanups (old_cleanups); | |
1819 | return -1; | |
1820 | } | |
237fc4c9 | 1821 | |
9f5a595d UW |
1822 | /* Save the information we need to fix things up if the step |
1823 | succeeds. */ | |
fc1cf338 PA |
1824 | displaced->step_ptid = ptid; |
1825 | displaced->step_gdbarch = gdbarch; | |
1826 | displaced->step_closure = closure; | |
1827 | displaced->step_original = original; | |
1828 | displaced->step_copy = copy; | |
9f5a595d | 1829 | |
fc1cf338 | 1830 | make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1831 | |
1832 | /* Resume execution at the copy. */ | |
515630c5 | 1833 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1834 | |
ad53cd71 PA |
1835 | discard_cleanups (ignore_cleanups); |
1836 | ||
1837 | do_cleanups (old_cleanups); | |
237fc4c9 PA |
1838 | |
1839 | if (debug_displaced) | |
5af949e3 UW |
1840 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1841 | paddress (gdbarch, copy)); | |
237fc4c9 | 1842 | |
237fc4c9 PA |
1843 | return 1; |
1844 | } | |
1845 | ||
3fc8eb30 PA |
1846 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1847 | attempts at displaced stepping if we get a memory error. */ | |
1848 | ||
1849 | static int | |
1850 | displaced_step_prepare (ptid_t ptid) | |
1851 | { | |
1852 | int prepared = -1; | |
1853 | ||
1854 | TRY | |
1855 | { | |
1856 | prepared = displaced_step_prepare_throw (ptid); | |
1857 | } | |
1858 | CATCH (ex, RETURN_MASK_ERROR) | |
1859 | { | |
1860 | struct displaced_step_inferior_state *displaced_state; | |
1861 | ||
1862 | if (ex.error != MEMORY_ERROR) | |
1863 | throw_exception (ex); | |
1864 | ||
1865 | if (debug_infrun) | |
1866 | { | |
1867 | fprintf_unfiltered (gdb_stdlog, | |
1868 | "infrun: disabling displaced stepping: %s\n", | |
1869 | ex.message); | |
1870 | } | |
1871 | ||
1872 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1873 | "auto". */ | |
1874 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1875 | { | |
fd7dcb94 | 1876 | warning (_("disabling displaced stepping: %s"), |
3fc8eb30 PA |
1877 | ex.message); |
1878 | } | |
1879 | ||
1880 | /* Disable further displaced stepping attempts. */ | |
1881 | displaced_state | |
1882 | = get_displaced_stepping_state (ptid_get_pid (ptid)); | |
1883 | displaced_state->failed_before = 1; | |
1884 | } | |
1885 | END_CATCH | |
1886 | ||
1887 | return prepared; | |
1888 | } | |
1889 | ||
237fc4c9 | 1890 | static void |
3e43a32a MS |
1891 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1892 | const gdb_byte *myaddr, int len) | |
237fc4c9 PA |
1893 | { |
1894 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
abbb1732 | 1895 | |
237fc4c9 PA |
1896 | inferior_ptid = ptid; |
1897 | write_memory (memaddr, myaddr, len); | |
1898 | do_cleanups (ptid_cleanup); | |
1899 | } | |
1900 | ||
e2d96639 YQ |
1901 | /* Restore the contents of the copy area for thread PTID. */ |
1902 | ||
1903 | static void | |
1904 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1905 | ptid_t ptid) | |
1906 | { | |
1907 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1908 | ||
1909 | write_memory_ptid (ptid, displaced->step_copy, | |
1910 | displaced->step_saved_copy, len); | |
1911 | if (debug_displaced) | |
1912 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
1913 | target_pid_to_str (ptid), | |
1914 | paddress (displaced->step_gdbarch, | |
1915 | displaced->step_copy)); | |
1916 | } | |
1917 | ||
372316f1 PA |
1918 | /* If we displaced stepped an instruction successfully, adjust |
1919 | registers and memory to yield the same effect the instruction would | |
1920 | have had if we had executed it at its original address, and return | |
1921 | 1. If the instruction didn't complete, relocate the PC and return | |
1922 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1923 | ||
1924 | static int | |
2ea28649 | 1925 | displaced_step_fixup (ptid_t event_ptid, enum gdb_signal signal) |
237fc4c9 PA |
1926 | { |
1927 | struct cleanup *old_cleanups; | |
fc1cf338 PA |
1928 | struct displaced_step_inferior_state *displaced |
1929 | = get_displaced_stepping_state (ptid_get_pid (event_ptid)); | |
372316f1 | 1930 | int ret; |
fc1cf338 PA |
1931 | |
1932 | /* Was any thread of this process doing a displaced step? */ | |
1933 | if (displaced == NULL) | |
372316f1 | 1934 | return 0; |
237fc4c9 PA |
1935 | |
1936 | /* Was this event for the pid we displaced? */ | |
fc1cf338 PA |
1937 | if (ptid_equal (displaced->step_ptid, null_ptid) |
1938 | || ! ptid_equal (displaced->step_ptid, event_ptid)) | |
372316f1 | 1939 | return 0; |
237fc4c9 | 1940 | |
fc1cf338 | 1941 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 | 1942 | |
e2d96639 | 1943 | displaced_step_restore (displaced, displaced->step_ptid); |
237fc4c9 | 1944 | |
cb71640d PA |
1945 | /* Fixup may need to read memory/registers. Switch to the thread |
1946 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
1947 | the current thread. */ | |
1948 | switch_to_thread (event_ptid); | |
1949 | ||
237fc4c9 | 1950 | /* Did the instruction complete successfully? */ |
cb71640d PA |
1951 | if (signal == GDB_SIGNAL_TRAP |
1952 | && !(target_stopped_by_watchpoint () | |
1953 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
1954 | || target_have_steppable_watchpoint))) | |
237fc4c9 PA |
1955 | { |
1956 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
1957 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
1958 | displaced->step_closure, | |
1959 | displaced->step_original, | |
1960 | displaced->step_copy, | |
1961 | get_thread_regcache (displaced->step_ptid)); | |
372316f1 | 1962 | ret = 1; |
237fc4c9 PA |
1963 | } |
1964 | else | |
1965 | { | |
1966 | /* Since the instruction didn't complete, all we can do is | |
1967 | relocate the PC. */ | |
515630c5 UW |
1968 | struct regcache *regcache = get_thread_regcache (event_ptid); |
1969 | CORE_ADDR pc = regcache_read_pc (regcache); | |
abbb1732 | 1970 | |
fc1cf338 | 1971 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1972 | regcache_write_pc (regcache, pc); |
372316f1 | 1973 | ret = -1; |
237fc4c9 PA |
1974 | } |
1975 | ||
1976 | do_cleanups (old_cleanups); | |
1977 | ||
fc1cf338 | 1978 | displaced->step_ptid = null_ptid; |
372316f1 PA |
1979 | |
1980 | return ret; | |
c2829269 | 1981 | } |
1c5cfe86 | 1982 | |
4d9d9d04 PA |
1983 | /* Data to be passed around while handling an event. This data is |
1984 | discarded between events. */ | |
1985 | struct execution_control_state | |
1986 | { | |
1987 | ptid_t ptid; | |
1988 | /* The thread that got the event, if this was a thread event; NULL | |
1989 | otherwise. */ | |
1990 | struct thread_info *event_thread; | |
1991 | ||
1992 | struct target_waitstatus ws; | |
1993 | int stop_func_filled_in; | |
1994 | CORE_ADDR stop_func_start; | |
1995 | CORE_ADDR stop_func_end; | |
1996 | const char *stop_func_name; | |
1997 | int wait_some_more; | |
1998 | ||
1999 | /* True if the event thread hit the single-step breakpoint of | |
2000 | another thread. Thus the event doesn't cause a stop, the thread | |
2001 | needs to be single-stepped past the single-step breakpoint before | |
2002 | we can switch back to the original stepping thread. */ | |
2003 | int hit_singlestep_breakpoint; | |
2004 | }; | |
2005 | ||
2006 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
2007 | |
2008 | static void | |
4d9d9d04 PA |
2009 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
2010 | { | |
2011 | memset (ecs, 0, sizeof (*ecs)); | |
2012 | ecs->event_thread = tp; | |
2013 | ecs->ptid = tp->ptid; | |
2014 | } | |
2015 | ||
2016 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
2017 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 2018 | static int keep_going_stepped_thread (struct thread_info *tp); |
4d9d9d04 | 2019 | static int thread_still_needs_step_over (struct thread_info *tp); |
3fc8eb30 | 2020 | static void stop_all_threads (void); |
4d9d9d04 PA |
2021 | |
2022 | /* Are there any pending step-over requests? If so, run all we can | |
2023 | now and return true. Otherwise, return false. */ | |
2024 | ||
2025 | static int | |
c2829269 PA |
2026 | start_step_over (void) |
2027 | { | |
2028 | struct thread_info *tp, *next; | |
2029 | ||
372316f1 PA |
2030 | /* Don't start a new step-over if we already have an in-line |
2031 | step-over operation ongoing. */ | |
2032 | if (step_over_info_valid_p ()) | |
2033 | return 0; | |
2034 | ||
c2829269 | 2035 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 2036 | { |
4d9d9d04 PA |
2037 | struct execution_control_state ecss; |
2038 | struct execution_control_state *ecs = &ecss; | |
372316f1 PA |
2039 | enum step_over_what step_what; |
2040 | int must_be_in_line; | |
c2829269 PA |
2041 | |
2042 | next = thread_step_over_chain_next (tp); | |
237fc4c9 | 2043 | |
c2829269 PA |
2044 | /* If this inferior already has a displaced step in process, |
2045 | don't start a new one. */ | |
4d9d9d04 | 2046 | if (displaced_step_in_progress (ptid_get_pid (tp->ptid))) |
c2829269 PA |
2047 | continue; |
2048 | ||
372316f1 PA |
2049 | step_what = thread_still_needs_step_over (tp); |
2050 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
2051 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 2052 | && !use_displaced_stepping (tp))); |
372316f1 PA |
2053 | |
2054 | /* We currently stop all threads of all processes to step-over | |
2055 | in-line. If we need to start a new in-line step-over, let | |
2056 | any pending displaced steps finish first. */ | |
2057 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
2058 | return 0; | |
2059 | ||
c2829269 PA |
2060 | thread_step_over_chain_remove (tp); |
2061 | ||
2062 | if (step_over_queue_head == NULL) | |
2063 | { | |
2064 | if (debug_infrun) | |
2065 | fprintf_unfiltered (gdb_stdlog, | |
2066 | "infrun: step-over queue now empty\n"); | |
2067 | } | |
2068 | ||
372316f1 PA |
2069 | if (tp->control.trap_expected |
2070 | || tp->resumed | |
2071 | || tp->executing) | |
ad53cd71 | 2072 | { |
4d9d9d04 PA |
2073 | internal_error (__FILE__, __LINE__, |
2074 | "[%s] has inconsistent state: " | |
372316f1 | 2075 | "trap_expected=%d, resumed=%d, executing=%d\n", |
4d9d9d04 PA |
2076 | target_pid_to_str (tp->ptid), |
2077 | tp->control.trap_expected, | |
372316f1 | 2078 | tp->resumed, |
4d9d9d04 | 2079 | tp->executing); |
ad53cd71 | 2080 | } |
1c5cfe86 | 2081 | |
4d9d9d04 PA |
2082 | if (debug_infrun) |
2083 | fprintf_unfiltered (gdb_stdlog, | |
2084 | "infrun: resuming [%s] for step-over\n", | |
2085 | target_pid_to_str (tp->ptid)); | |
2086 | ||
2087 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2088 | is no longer inserted. In all-stop, we want to keep looking | |
2089 | for a thread that needs a step-over instead of resuming TP, | |
2090 | because we wouldn't be able to resume anything else until the | |
2091 | target stops again. In non-stop, the resume always resumes | |
2092 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2093 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2094 | continue; |
8550d3b3 | 2095 | |
4d9d9d04 PA |
2096 | switch_to_thread (tp->ptid); |
2097 | reset_ecs (ecs, tp); | |
2098 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2099 | |
4d9d9d04 PA |
2100 | if (!ecs->wait_some_more) |
2101 | error (_("Command aborted.")); | |
1c5cfe86 | 2102 | |
372316f1 PA |
2103 | gdb_assert (tp->resumed); |
2104 | ||
2105 | /* If we started a new in-line step-over, we're done. */ | |
2106 | if (step_over_info_valid_p ()) | |
2107 | { | |
2108 | gdb_assert (tp->control.trap_expected); | |
2109 | return 1; | |
2110 | } | |
2111 | ||
fbea99ea | 2112 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2113 | { |
2114 | /* On all-stop, shouldn't have resumed unless we needed a | |
2115 | step over. */ | |
2116 | gdb_assert (tp->control.trap_expected | |
2117 | || tp->step_after_step_resume_breakpoint); | |
2118 | ||
2119 | /* With remote targets (at least), in all-stop, we can't | |
2120 | issue any further remote commands until the program stops | |
2121 | again. */ | |
2122 | return 1; | |
1c5cfe86 | 2123 | } |
c2829269 | 2124 | |
4d9d9d04 PA |
2125 | /* Either the thread no longer needed a step-over, or a new |
2126 | displaced stepping sequence started. Even in the latter | |
2127 | case, continue looking. Maybe we can also start another | |
2128 | displaced step on a thread of other process. */ | |
237fc4c9 | 2129 | } |
4d9d9d04 PA |
2130 | |
2131 | return 0; | |
237fc4c9 PA |
2132 | } |
2133 | ||
5231c1fd PA |
2134 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2135 | holding OLD_PTID. */ | |
2136 | static void | |
2137 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2138 | { | |
2139 | struct displaced_step_request *it; | |
fc1cf338 | 2140 | struct displaced_step_inferior_state *displaced; |
5231c1fd PA |
2141 | |
2142 | if (ptid_equal (inferior_ptid, old_ptid)) | |
2143 | inferior_ptid = new_ptid; | |
2144 | ||
fc1cf338 PA |
2145 | for (displaced = displaced_step_inferior_states; |
2146 | displaced; | |
2147 | displaced = displaced->next) | |
2148 | { | |
2149 | if (ptid_equal (displaced->step_ptid, old_ptid)) | |
2150 | displaced->step_ptid = new_ptid; | |
fc1cf338 | 2151 | } |
5231c1fd PA |
2152 | } |
2153 | ||
237fc4c9 PA |
2154 | \f |
2155 | /* Resuming. */ | |
c906108c SS |
2156 | |
2157 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 2158 | static void |
74b7792f | 2159 | resume_cleanups (void *ignore) |
c906108c | 2160 | { |
34b7e8a6 PA |
2161 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2162 | delete_single_step_breakpoints (inferior_thread ()); | |
7c16b83e | 2163 | |
c906108c SS |
2164 | normal_stop (); |
2165 | } | |
2166 | ||
53904c9e AC |
2167 | static const char schedlock_off[] = "off"; |
2168 | static const char schedlock_on[] = "on"; | |
2169 | static const char schedlock_step[] = "step"; | |
40478521 | 2170 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2171 | schedlock_off, |
2172 | schedlock_on, | |
2173 | schedlock_step, | |
2174 | NULL | |
2175 | }; | |
920d2a44 AC |
2176 | static const char *scheduler_mode = schedlock_off; |
2177 | static void | |
2178 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2179 | struct cmd_list_element *c, const char *value) | |
2180 | { | |
3e43a32a MS |
2181 | fprintf_filtered (file, |
2182 | _("Mode for locking scheduler " | |
2183 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2184 | value); |
2185 | } | |
c906108c SS |
2186 | |
2187 | static void | |
96baa820 | 2188 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2189 | { |
eefe576e AC |
2190 | if (!target_can_lock_scheduler) |
2191 | { | |
2192 | scheduler_mode = schedlock_off; | |
2193 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2194 | } | |
c906108c SS |
2195 | } |
2196 | ||
d4db2f36 PA |
2197 | /* True if execution commands resume all threads of all processes by |
2198 | default; otherwise, resume only threads of the current inferior | |
2199 | process. */ | |
2200 | int sched_multi = 0; | |
2201 | ||
2facfe5c DD |
2202 | /* Try to setup for software single stepping over the specified location. |
2203 | Return 1 if target_resume() should use hardware single step. | |
2204 | ||
2205 | GDBARCH the current gdbarch. | |
2206 | PC the location to step over. */ | |
2207 | ||
2208 | static int | |
2209 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2210 | { | |
2211 | int hw_step = 1; | |
2212 | ||
f02253f1 HZ |
2213 | if (execution_direction == EXEC_FORWARD |
2214 | && gdbarch_software_single_step_p (gdbarch) | |
99e40580 | 2215 | && gdbarch_software_single_step (gdbarch, get_current_frame ())) |
2facfe5c | 2216 | { |
99e40580 | 2217 | hw_step = 0; |
2facfe5c DD |
2218 | } |
2219 | return hw_step; | |
2220 | } | |
c906108c | 2221 | |
f3263aa4 PA |
2222 | /* See infrun.h. */ |
2223 | ||
09cee04b PA |
2224 | ptid_t |
2225 | user_visible_resume_ptid (int step) | |
2226 | { | |
f3263aa4 | 2227 | ptid_t resume_ptid; |
09cee04b | 2228 | |
09cee04b PA |
2229 | if (non_stop) |
2230 | { | |
2231 | /* With non-stop mode on, threads are always handled | |
2232 | individually. */ | |
2233 | resume_ptid = inferior_ptid; | |
2234 | } | |
2235 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2236 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2237 | { |
f3263aa4 PA |
2238 | /* User-settable 'scheduler' mode requires solo thread |
2239 | resume. */ | |
09cee04b PA |
2240 | resume_ptid = inferior_ptid; |
2241 | } | |
f3263aa4 PA |
2242 | else if (!sched_multi && target_supports_multi_process ()) |
2243 | { | |
2244 | /* Resume all threads of the current process (and none of other | |
2245 | processes). */ | |
2246 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
2247 | } | |
2248 | else | |
2249 | { | |
2250 | /* Resume all threads of all processes. */ | |
2251 | resume_ptid = RESUME_ALL; | |
2252 | } | |
09cee04b PA |
2253 | |
2254 | return resume_ptid; | |
2255 | } | |
2256 | ||
fbea99ea PA |
2257 | /* Return a ptid representing the set of threads that we will resume, |
2258 | in the perspective of the target, assuming run control handling | |
2259 | does not require leaving some threads stopped (e.g., stepping past | |
2260 | breakpoint). USER_STEP indicates whether we're about to start the | |
2261 | target for a stepping command. */ | |
2262 | ||
2263 | static ptid_t | |
2264 | internal_resume_ptid (int user_step) | |
2265 | { | |
2266 | /* In non-stop, we always control threads individually. Note that | |
2267 | the target may always work in non-stop mode even with "set | |
2268 | non-stop off", in which case user_visible_resume_ptid could | |
2269 | return a wildcard ptid. */ | |
2270 | if (target_is_non_stop_p ()) | |
2271 | return inferior_ptid; | |
2272 | else | |
2273 | return user_visible_resume_ptid (user_step); | |
2274 | } | |
2275 | ||
64ce06e4 PA |
2276 | /* Wrapper for target_resume, that handles infrun-specific |
2277 | bookkeeping. */ | |
2278 | ||
2279 | static void | |
2280 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2281 | { | |
2282 | struct thread_info *tp = inferior_thread (); | |
2283 | ||
2284 | /* Install inferior's terminal modes. */ | |
2285 | target_terminal_inferior (); | |
2286 | ||
2287 | /* Avoid confusing the next resume, if the next stop/resume | |
2288 | happens to apply to another thread. */ | |
2289 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2290 | ||
8f572e5c PA |
2291 | /* Advise target which signals may be handled silently. |
2292 | ||
2293 | If we have removed breakpoints because we are stepping over one | |
2294 | in-line (in any thread), we need to receive all signals to avoid | |
2295 | accidentally skipping a breakpoint during execution of a signal | |
2296 | handler. | |
2297 | ||
2298 | Likewise if we're displaced stepping, otherwise a trap for a | |
2299 | breakpoint in a signal handler might be confused with the | |
2300 | displaced step finishing. We don't make the displaced_step_fixup | |
2301 | step distinguish the cases instead, because: | |
2302 | ||
2303 | - a backtrace while stopped in the signal handler would show the | |
2304 | scratch pad as frame older than the signal handler, instead of | |
2305 | the real mainline code. | |
2306 | ||
2307 | - when the thread is later resumed, the signal handler would | |
2308 | return to the scratch pad area, which would no longer be | |
2309 | valid. */ | |
2310 | if (step_over_info_valid_p () | |
2311 | || displaced_step_in_progress (ptid_get_pid (tp->ptid))) | |
64ce06e4 PA |
2312 | target_pass_signals (0, NULL); |
2313 | else | |
2314 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
2315 | ||
2316 | target_resume (resume_ptid, step, sig); | |
2317 | } | |
2318 | ||
c906108c SS |
2319 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
2320 | wants to interrupt some lengthy single-stepping operation | |
2321 | (for child processes, the SIGINT goes to the inferior, and so | |
2322 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
2323 | other targets, that's not true). | |
2324 | ||
c906108c SS |
2325 | SIG is the signal to give the inferior (zero for none). */ |
2326 | void | |
64ce06e4 | 2327 | resume (enum gdb_signal sig) |
c906108c | 2328 | { |
74b7792f | 2329 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
2330 | struct regcache *regcache = get_current_regcache (); |
2331 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4e1c45ea | 2332 | struct thread_info *tp = inferior_thread (); |
515630c5 | 2333 | CORE_ADDR pc = regcache_read_pc (regcache); |
6c95b8df | 2334 | struct address_space *aspace = get_regcache_aspace (regcache); |
b0f16a3e | 2335 | ptid_t resume_ptid; |
856e7dd6 PA |
2336 | /* This represents the user's step vs continue request. When |
2337 | deciding whether "set scheduler-locking step" applies, it's the | |
2338 | user's intention that counts. */ | |
2339 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2340 | /* This represents what we'll actually request the target to do. |
2341 | This can decay from a step to a continue, if e.g., we need to | |
2342 | implement single-stepping with breakpoints (software | |
2343 | single-step). */ | |
6b403daa | 2344 | int step; |
c7e8a53c | 2345 | |
c2829269 PA |
2346 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2347 | ||
c906108c SS |
2348 | QUIT; |
2349 | ||
372316f1 PA |
2350 | if (tp->suspend.waitstatus_pending_p) |
2351 | { | |
2352 | if (debug_infrun) | |
2353 | { | |
2354 | char *statstr; | |
2355 | ||
2356 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
2357 | fprintf_unfiltered (gdb_stdlog, | |
2358 | "infrun: resume: thread %s has pending wait status %s " | |
2359 | "(currently_stepping=%d).\n", | |
2360 | target_pid_to_str (tp->ptid), statstr, | |
2361 | currently_stepping (tp)); | |
2362 | xfree (statstr); | |
2363 | } | |
2364 | ||
2365 | tp->resumed = 1; | |
2366 | ||
2367 | /* FIXME: What should we do if we are supposed to resume this | |
2368 | thread with a signal? Maybe we should maintain a queue of | |
2369 | pending signals to deliver. */ | |
2370 | if (sig != GDB_SIGNAL_0) | |
2371 | { | |
fd7dcb94 | 2372 | warning (_("Couldn't deliver signal %s to %s."), |
372316f1 PA |
2373 | gdb_signal_to_name (sig), target_pid_to_str (tp->ptid)); |
2374 | } | |
2375 | ||
2376 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2377 | discard_cleanups (old_cleanups); | |
2378 | ||
2379 | if (target_can_async_p ()) | |
2380 | target_async (1); | |
2381 | return; | |
2382 | } | |
2383 | ||
2384 | tp->stepped_breakpoint = 0; | |
2385 | ||
6b403daa PA |
2386 | /* Depends on stepped_breakpoint. */ |
2387 | step = currently_stepping (tp); | |
2388 | ||
74609e71 YQ |
2389 | if (current_inferior ()->waiting_for_vfork_done) |
2390 | { | |
48f9886d PA |
2391 | /* Don't try to single-step a vfork parent that is waiting for |
2392 | the child to get out of the shared memory region (by exec'ing | |
2393 | or exiting). This is particularly important on software | |
2394 | single-step archs, as the child process would trip on the | |
2395 | software single step breakpoint inserted for the parent | |
2396 | process. Since the parent will not actually execute any | |
2397 | instruction until the child is out of the shared region (such | |
2398 | are vfork's semantics), it is safe to simply continue it. | |
2399 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2400 | the parent, and tell it to `keep_going', which automatically | |
2401 | re-sets it stepping. */ | |
74609e71 YQ |
2402 | if (debug_infrun) |
2403 | fprintf_unfiltered (gdb_stdlog, | |
2404 | "infrun: resume : clear step\n"); | |
a09dd441 | 2405 | step = 0; |
74609e71 YQ |
2406 | } |
2407 | ||
527159b7 | 2408 | if (debug_infrun) |
237fc4c9 | 2409 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 2410 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 2411 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
2412 | step, gdb_signal_to_symbol_string (sig), |
2413 | tp->control.trap_expected, | |
0d9a9a5f PA |
2414 | target_pid_to_str (inferior_ptid), |
2415 | paddress (gdbarch, pc)); | |
c906108c | 2416 | |
c2c6d25f JM |
2417 | /* Normally, by the time we reach `resume', the breakpoints are either |
2418 | removed or inserted, as appropriate. The exception is if we're sitting | |
2419 | at a permanent breakpoint; we need to step over it, but permanent | |
2420 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2421 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2422 | { |
af48d08f PA |
2423 | if (sig != GDB_SIGNAL_0) |
2424 | { | |
2425 | /* We have a signal to pass to the inferior. The resume | |
2426 | may, or may not take us to the signal handler. If this | |
2427 | is a step, we'll need to stop in the signal handler, if | |
2428 | there's one, (if the target supports stepping into | |
2429 | handlers), or in the next mainline instruction, if | |
2430 | there's no handler. If this is a continue, we need to be | |
2431 | sure to run the handler with all breakpoints inserted. | |
2432 | In all cases, set a breakpoint at the current address | |
2433 | (where the handler returns to), and once that breakpoint | |
2434 | is hit, resume skipping the permanent breakpoint. If | |
2435 | that breakpoint isn't hit, then we've stepped into the | |
2436 | signal handler (or hit some other event). We'll delete | |
2437 | the step-resume breakpoint then. */ | |
2438 | ||
2439 | if (debug_infrun) | |
2440 | fprintf_unfiltered (gdb_stdlog, | |
2441 | "infrun: resume: skipping permanent breakpoint, " | |
2442 | "deliver signal first\n"); | |
2443 | ||
2444 | clear_step_over_info (); | |
2445 | tp->control.trap_expected = 0; | |
2446 | ||
2447 | if (tp->control.step_resume_breakpoint == NULL) | |
2448 | { | |
2449 | /* Set a "high-priority" step-resume, as we don't want | |
2450 | user breakpoints at PC to trigger (again) when this | |
2451 | hits. */ | |
2452 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2453 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2454 | ||
2455 | tp->step_after_step_resume_breakpoint = step; | |
2456 | } | |
2457 | ||
2458 | insert_breakpoints (); | |
2459 | } | |
2460 | else | |
2461 | { | |
2462 | /* There's no signal to pass, we can go ahead and skip the | |
2463 | permanent breakpoint manually. */ | |
2464 | if (debug_infrun) | |
2465 | fprintf_unfiltered (gdb_stdlog, | |
2466 | "infrun: resume: skipping permanent breakpoint\n"); | |
2467 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
2468 | /* Update pc to reflect the new address from which we will | |
2469 | execute instructions. */ | |
2470 | pc = regcache_read_pc (regcache); | |
2471 | ||
2472 | if (step) | |
2473 | { | |
2474 | /* We've already advanced the PC, so the stepping part | |
2475 | is done. Now we need to arrange for a trap to be | |
2476 | reported to handle_inferior_event. Set a breakpoint | |
2477 | at the current PC, and run to it. Don't update | |
2478 | prev_pc, because if we end in | |
44a1ee51 PA |
2479 | switch_back_to_stepped_thread, we want the "expected |
2480 | thread advanced also" branch to be taken. IOW, we | |
2481 | don't want this thread to step further from PC | |
af48d08f | 2482 | (overstep). */ |
1ac806b8 | 2483 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2484 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2485 | insert_breakpoints (); | |
2486 | ||
fbea99ea | 2487 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2488 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
af48d08f | 2489 | discard_cleanups (old_cleanups); |
372316f1 | 2490 | tp->resumed = 1; |
af48d08f PA |
2491 | return; |
2492 | } | |
2493 | } | |
6d350bb5 | 2494 | } |
c2c6d25f | 2495 | |
c1e36e3e PA |
2496 | /* If we have a breakpoint to step over, make sure to do a single |
2497 | step only. Same if we have software watchpoints. */ | |
2498 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2499 | tp->control.may_range_step = 0; | |
2500 | ||
237fc4c9 PA |
2501 | /* If enabled, step over breakpoints by executing a copy of the |
2502 | instruction at a different address. | |
2503 | ||
2504 | We can't use displaced stepping when we have a signal to deliver; | |
2505 | the comments for displaced_step_prepare explain why. The | |
2506 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2507 | signals' explain what we do instead. |
2508 | ||
2509 | We can't use displaced stepping when we are waiting for vfork_done | |
2510 | event, displaced stepping breaks the vfork child similarly as single | |
2511 | step software breakpoint. */ | |
3fc8eb30 PA |
2512 | if (tp->control.trap_expected |
2513 | && use_displaced_stepping (tp) | |
cb71640d | 2514 | && !step_over_info_valid_p () |
a493e3e2 | 2515 | && sig == GDB_SIGNAL_0 |
74609e71 | 2516 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2517 | { |
3fc8eb30 | 2518 | int prepared = displaced_step_prepare (inferior_ptid); |
fc1cf338 | 2519 | |
3fc8eb30 | 2520 | if (prepared == 0) |
d56b7306 | 2521 | { |
4d9d9d04 PA |
2522 | if (debug_infrun) |
2523 | fprintf_unfiltered (gdb_stdlog, | |
2524 | "Got placed in step-over queue\n"); | |
2525 | ||
2526 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2527 | discard_cleanups (old_cleanups); |
2528 | return; | |
2529 | } | |
3fc8eb30 PA |
2530 | else if (prepared < 0) |
2531 | { | |
2532 | /* Fallback to stepping over the breakpoint in-line. */ | |
2533 | ||
2534 | if (target_is_non_stop_p ()) | |
2535 | stop_all_threads (); | |
2536 | ||
2537 | set_step_over_info (get_regcache_aspace (regcache), | |
2538 | regcache_read_pc (regcache), 0); | |
2539 | ||
2540 | step = maybe_software_singlestep (gdbarch, pc); | |
2541 | ||
2542 | insert_breakpoints (); | |
2543 | } | |
2544 | else if (prepared > 0) | |
2545 | { | |
2546 | struct displaced_step_inferior_state *displaced; | |
99e40580 | 2547 | |
3fc8eb30 PA |
2548 | /* Update pc to reflect the new address from which we will |
2549 | execute instructions due to displaced stepping. */ | |
2550 | pc = regcache_read_pc (get_thread_regcache (inferior_ptid)); | |
ca7781d2 | 2551 | |
3fc8eb30 PA |
2552 | displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); |
2553 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, | |
2554 | displaced->step_closure); | |
2555 | } | |
237fc4c9 PA |
2556 | } |
2557 | ||
2facfe5c | 2558 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2559 | else if (step) |
2facfe5c | 2560 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2561 | |
30852783 UW |
2562 | /* Currently, our software single-step implementation leads to different |
2563 | results than hardware single-stepping in one situation: when stepping | |
2564 | into delivering a signal which has an associated signal handler, | |
2565 | hardware single-step will stop at the first instruction of the handler, | |
2566 | while software single-step will simply skip execution of the handler. | |
2567 | ||
2568 | For now, this difference in behavior is accepted since there is no | |
2569 | easy way to actually implement single-stepping into a signal handler | |
2570 | without kernel support. | |
2571 | ||
2572 | However, there is one scenario where this difference leads to follow-on | |
2573 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2574 | and then single-stepping. In this case, the software single-step | |
2575 | behavior means that even if there is a *breakpoint* in the signal | |
2576 | handler, GDB still would not stop. | |
2577 | ||
2578 | Fortunately, we can at least fix this particular issue. We detect | |
2579 | here the case where we are about to deliver a signal while software | |
2580 | single-stepping with breakpoints removed. In this situation, we | |
2581 | revert the decisions to remove all breakpoints and insert single- | |
2582 | step breakpoints, and instead we install a step-resume breakpoint | |
2583 | at the current address, deliver the signal without stepping, and | |
2584 | once we arrive back at the step-resume breakpoint, actually step | |
2585 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2586 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2587 | && sig != GDB_SIGNAL_0 |
2588 | && step_over_info_valid_p ()) | |
30852783 UW |
2589 | { |
2590 | /* If we have nested signals or a pending signal is delivered | |
2591 | immediately after a handler returns, might might already have | |
2592 | a step-resume breakpoint set on the earlier handler. We cannot | |
2593 | set another step-resume breakpoint; just continue on until the | |
2594 | original breakpoint is hit. */ | |
2595 | if (tp->control.step_resume_breakpoint == NULL) | |
2596 | { | |
2c03e5be | 2597 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2598 | tp->step_after_step_resume_breakpoint = 1; |
2599 | } | |
2600 | ||
34b7e8a6 | 2601 | delete_single_step_breakpoints (tp); |
30852783 | 2602 | |
31e77af2 | 2603 | clear_step_over_info (); |
30852783 | 2604 | tp->control.trap_expected = 0; |
31e77af2 PA |
2605 | |
2606 | insert_breakpoints (); | |
30852783 UW |
2607 | } |
2608 | ||
b0f16a3e SM |
2609 | /* If STEP is set, it's a request to use hardware stepping |
2610 | facilities. But in that case, we should never | |
2611 | use singlestep breakpoint. */ | |
34b7e8a6 | 2612 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2613 | |
fbea99ea | 2614 | /* Decide the set of threads to ask the target to resume. */ |
34b7e8a6 | 2615 | if ((step || thread_has_single_step_breakpoints_set (tp)) |
b0f16a3e SM |
2616 | && tp->control.trap_expected) |
2617 | { | |
2618 | /* We're allowing a thread to run past a breakpoint it has | |
2619 | hit, by single-stepping the thread with the breakpoint | |
2620 | removed. In which case, we need to single-step only this | |
2621 | thread, and keep others stopped, as they can miss this | |
2622 | breakpoint if allowed to run. */ | |
2623 | resume_ptid = inferior_ptid; | |
2624 | } | |
fbea99ea PA |
2625 | else |
2626 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2627 | |
7f5ef605 PA |
2628 | if (execution_direction != EXEC_REVERSE |
2629 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2630 | { |
372316f1 PA |
2631 | /* There are two cases where we currently need to step a |
2632 | breakpoint instruction when we have a signal to deliver: | |
2633 | ||
2634 | - See handle_signal_stop where we handle random signals that | |
2635 | could take out us out of the stepping range. Normally, in | |
2636 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2637 | signal handler with a breakpoint at PC, but there are cases |
2638 | where we should _always_ single-step, even if we have a | |
2639 | step-resume breakpoint, like when a software watchpoint is | |
2640 | set. Assuming single-stepping and delivering a signal at the | |
2641 | same time would takes us to the signal handler, then we could | |
2642 | have removed the breakpoint at PC to step over it. However, | |
2643 | some hardware step targets (like e.g., Mac OS) can't step | |
2644 | into signal handlers, and for those, we need to leave the | |
2645 | breakpoint at PC inserted, as otherwise if the handler | |
2646 | recurses and executes PC again, it'll miss the breakpoint. | |
2647 | So we leave the breakpoint inserted anyway, but we need to | |
2648 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2649 | that adjust_pc_after_break doesn't end up confused. |
2650 | ||
2651 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2652 | in one thread after another thread that was stepping had been | |
2653 | momentarily paused for a step-over. When we re-resume the | |
2654 | stepping thread, it may be resumed from that address with a | |
2655 | breakpoint that hasn't trapped yet. Seen with | |
2656 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2657 | do displaced stepping. */ | |
2658 | ||
2659 | if (debug_infrun) | |
2660 | fprintf_unfiltered (gdb_stdlog, | |
2661 | "infrun: resume: [%s] stepped breakpoint\n", | |
2662 | target_pid_to_str (tp->ptid)); | |
7f5ef605 PA |
2663 | |
2664 | tp->stepped_breakpoint = 1; | |
2665 | ||
b0f16a3e SM |
2666 | /* Most targets can step a breakpoint instruction, thus |
2667 | executing it normally. But if this one cannot, just | |
2668 | continue and we will hit it anyway. */ | |
7f5ef605 | 2669 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2670 | step = 0; |
2671 | } | |
ef5cf84e | 2672 | |
b0f16a3e | 2673 | if (debug_displaced |
cb71640d | 2674 | && tp->control.trap_expected |
3fc8eb30 | 2675 | && use_displaced_stepping (tp) |
cb71640d | 2676 | && !step_over_info_valid_p ()) |
b0f16a3e | 2677 | { |
d9b67d9f | 2678 | struct regcache *resume_regcache = get_thread_regcache (tp->ptid); |
b0f16a3e SM |
2679 | struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache); |
2680 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); | |
2681 | gdb_byte buf[4]; | |
2682 | ||
2683 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2684 | paddress (resume_gdbarch, actual_pc)); | |
2685 | read_memory (actual_pc, buf, sizeof (buf)); | |
2686 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2687 | } | |
237fc4c9 | 2688 | |
b0f16a3e SM |
2689 | if (tp->control.may_range_step) |
2690 | { | |
2691 | /* If we're resuming a thread with the PC out of the step | |
2692 | range, then we're doing some nested/finer run control | |
2693 | operation, like stepping the thread out of the dynamic | |
2694 | linker or the displaced stepping scratch pad. We | |
2695 | shouldn't have allowed a range step then. */ | |
2696 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2697 | } | |
c1e36e3e | 2698 | |
64ce06e4 | 2699 | do_target_resume (resume_ptid, step, sig); |
372316f1 | 2700 | tp->resumed = 1; |
c906108c SS |
2701 | discard_cleanups (old_cleanups); |
2702 | } | |
2703 | \f | |
237fc4c9 | 2704 | /* Proceeding. */ |
c906108c SS |
2705 | |
2706 | /* Clear out all variables saying what to do when inferior is continued. | |
2707 | First do this, then set the ones you want, then call `proceed'. */ | |
2708 | ||
a7212384 UW |
2709 | static void |
2710 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2711 | { |
a7212384 UW |
2712 | if (debug_infrun) |
2713 | fprintf_unfiltered (gdb_stdlog, | |
2714 | "infrun: clear_proceed_status_thread (%s)\n", | |
2715 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 2716 | |
372316f1 PA |
2717 | /* If we're starting a new sequence, then the previous finished |
2718 | single-step is no longer relevant. */ | |
2719 | if (tp->suspend.waitstatus_pending_p) | |
2720 | { | |
2721 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2722 | { | |
2723 | if (debug_infrun) | |
2724 | fprintf_unfiltered (gdb_stdlog, | |
2725 | "infrun: clear_proceed_status: pending " | |
2726 | "event of %s was a finished step. " | |
2727 | "Discarding.\n", | |
2728 | target_pid_to_str (tp->ptid)); | |
2729 | ||
2730 | tp->suspend.waitstatus_pending_p = 0; | |
2731 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2732 | } | |
2733 | else if (debug_infrun) | |
2734 | { | |
2735 | char *statstr; | |
2736 | ||
2737 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
2738 | fprintf_unfiltered (gdb_stdlog, | |
2739 | "infrun: clear_proceed_status_thread: thread %s " | |
2740 | "has pending wait status %s " | |
2741 | "(currently_stepping=%d).\n", | |
2742 | target_pid_to_str (tp->ptid), statstr, | |
2743 | currently_stepping (tp)); | |
2744 | xfree (statstr); | |
2745 | } | |
2746 | } | |
2747 | ||
70509625 PA |
2748 | /* If this signal should not be seen by program, give it zero. |
2749 | Used for debugging signals. */ | |
2750 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2751 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2752 | ||
243a9253 PA |
2753 | thread_fsm_delete (tp->thread_fsm); |
2754 | tp->thread_fsm = NULL; | |
2755 | ||
16c381f0 JK |
2756 | tp->control.trap_expected = 0; |
2757 | tp->control.step_range_start = 0; | |
2758 | tp->control.step_range_end = 0; | |
c1e36e3e | 2759 | tp->control.may_range_step = 0; |
16c381f0 JK |
2760 | tp->control.step_frame_id = null_frame_id; |
2761 | tp->control.step_stack_frame_id = null_frame_id; | |
2762 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2763 | tp->control.step_start_function = NULL; |
a7212384 | 2764 | tp->stop_requested = 0; |
4e1c45ea | 2765 | |
16c381f0 | 2766 | tp->control.stop_step = 0; |
32400beb | 2767 | |
16c381f0 | 2768 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2769 | |
17b2616c | 2770 | tp->control.command_interp = NULL; |
856e7dd6 | 2771 | tp->control.stepping_command = 0; |
17b2616c | 2772 | |
a7212384 | 2773 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2774 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2775 | } |
32400beb | 2776 | |
a7212384 | 2777 | void |
70509625 | 2778 | clear_proceed_status (int step) |
a7212384 | 2779 | { |
6c95b8df PA |
2780 | if (!non_stop) |
2781 | { | |
70509625 PA |
2782 | struct thread_info *tp; |
2783 | ptid_t resume_ptid; | |
2784 | ||
2785 | resume_ptid = user_visible_resume_ptid (step); | |
2786 | ||
2787 | /* In all-stop mode, delete the per-thread status of all threads | |
2788 | we're about to resume, implicitly and explicitly. */ | |
2789 | ALL_NON_EXITED_THREADS (tp) | |
2790 | { | |
2791 | if (!ptid_match (tp->ptid, resume_ptid)) | |
2792 | continue; | |
2793 | clear_proceed_status_thread (tp); | |
2794 | } | |
6c95b8df PA |
2795 | } |
2796 | ||
a7212384 UW |
2797 | if (!ptid_equal (inferior_ptid, null_ptid)) |
2798 | { | |
2799 | struct inferior *inferior; | |
2800 | ||
2801 | if (non_stop) | |
2802 | { | |
6c95b8df PA |
2803 | /* If in non-stop mode, only delete the per-thread status of |
2804 | the current thread. */ | |
a7212384 UW |
2805 | clear_proceed_status_thread (inferior_thread ()); |
2806 | } | |
6c95b8df | 2807 | |
d6b48e9c | 2808 | inferior = current_inferior (); |
16c381f0 | 2809 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2810 | } |
2811 | ||
c906108c | 2812 | stop_after_trap = 0; |
f3b1572e PA |
2813 | |
2814 | observer_notify_about_to_proceed (); | |
c906108c SS |
2815 | } |
2816 | ||
99619bea PA |
2817 | /* Returns true if TP is still stopped at a breakpoint that needs |
2818 | stepping-over in order to make progress. If the breakpoint is gone | |
2819 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2820 | |
2821 | static int | |
6c4cfb24 | 2822 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2823 | { |
2824 | if (tp->stepping_over_breakpoint) | |
2825 | { | |
2826 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
2827 | ||
2828 | if (breakpoint_here_p (get_regcache_aspace (regcache), | |
af48d08f PA |
2829 | regcache_read_pc (regcache)) |
2830 | == ordinary_breakpoint_here) | |
99619bea PA |
2831 | return 1; |
2832 | ||
2833 | tp->stepping_over_breakpoint = 0; | |
2834 | } | |
2835 | ||
2836 | return 0; | |
2837 | } | |
2838 | ||
6c4cfb24 PA |
2839 | /* Check whether thread TP still needs to start a step-over in order |
2840 | to make progress when resumed. Returns an bitwise or of enum | |
2841 | step_over_what bits, indicating what needs to be stepped over. */ | |
2842 | ||
2843 | static int | |
2844 | thread_still_needs_step_over (struct thread_info *tp) | |
2845 | { | |
2846 | struct inferior *inf = find_inferior_ptid (tp->ptid); | |
2847 | int what = 0; | |
2848 | ||
2849 | if (thread_still_needs_step_over_bp (tp)) | |
2850 | what |= STEP_OVER_BREAKPOINT; | |
2851 | ||
2852 | if (tp->stepping_over_watchpoint | |
2853 | && !target_have_steppable_watchpoint) | |
2854 | what |= STEP_OVER_WATCHPOINT; | |
2855 | ||
2856 | return what; | |
2857 | } | |
2858 | ||
483805cf PA |
2859 | /* Returns true if scheduler locking applies. STEP indicates whether |
2860 | we're about to do a step/next-like command to a thread. */ | |
2861 | ||
2862 | static int | |
856e7dd6 | 2863 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2864 | { |
2865 | return (scheduler_mode == schedlock_on | |
2866 | || (scheduler_mode == schedlock_step | |
856e7dd6 | 2867 | && tp->control.stepping_command)); |
483805cf PA |
2868 | } |
2869 | ||
c906108c SS |
2870 | /* Basic routine for continuing the program in various fashions. |
2871 | ||
2872 | ADDR is the address to resume at, or -1 for resume where stopped. | |
2873 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 2874 | or -1 for act according to how it stopped. |
c906108c | 2875 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
2876 | -1 means return after that and print nothing. |
2877 | You should probably set various step_... variables | |
2878 | before calling here, if you are stepping. | |
c906108c SS |
2879 | |
2880 | You should call clear_proceed_status before calling proceed. */ | |
2881 | ||
2882 | void | |
64ce06e4 | 2883 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2884 | { |
e58b0e63 PA |
2885 | struct regcache *regcache; |
2886 | struct gdbarch *gdbarch; | |
4e1c45ea | 2887 | struct thread_info *tp; |
e58b0e63 | 2888 | CORE_ADDR pc; |
6c95b8df | 2889 | struct address_space *aspace; |
4d9d9d04 PA |
2890 | ptid_t resume_ptid; |
2891 | struct execution_control_state ecss; | |
2892 | struct execution_control_state *ecs = &ecss; | |
2893 | struct cleanup *old_chain; | |
2894 | int started; | |
c906108c | 2895 | |
e58b0e63 PA |
2896 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2897 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2898 | resuming the current thread. */ | |
2899 | if (!follow_fork ()) | |
2900 | { | |
2901 | /* The target for some reason decided not to resume. */ | |
2902 | normal_stop (); | |
f148b27e PA |
2903 | if (target_can_async_p ()) |
2904 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2905 | return; |
2906 | } | |
2907 | ||
842951eb PA |
2908 | /* We'll update this if & when we switch to a new thread. */ |
2909 | previous_inferior_ptid = inferior_ptid; | |
2910 | ||
e58b0e63 PA |
2911 | regcache = get_current_regcache (); |
2912 | gdbarch = get_regcache_arch (regcache); | |
6c95b8df | 2913 | aspace = get_regcache_aspace (regcache); |
e58b0e63 | 2914 | pc = regcache_read_pc (regcache); |
2adfaa28 | 2915 | tp = inferior_thread (); |
e58b0e63 | 2916 | |
99619bea PA |
2917 | /* Fill in with reasonable starting values. */ |
2918 | init_thread_stepping_state (tp); | |
2919 | ||
c2829269 PA |
2920 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2921 | ||
2acceee2 | 2922 | if (addr == (CORE_ADDR) -1) |
c906108c | 2923 | { |
af48d08f PA |
2924 | if (pc == stop_pc |
2925 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here | |
b2175913 | 2926 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2927 | /* There is a breakpoint at the address we will resume at, |
2928 | step one instruction before inserting breakpoints so that | |
2929 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2930 | breakpoint). |
2931 | ||
2932 | Note, we don't do this in reverse, because we won't | |
2933 | actually be executing the breakpoint insn anyway. | |
2934 | We'll be (un-)executing the previous instruction. */ | |
99619bea | 2935 | tp->stepping_over_breakpoint = 1; |
515630c5 UW |
2936 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2937 | && gdbarch_single_step_through_delay (gdbarch, | |
2938 | get_current_frame ())) | |
3352ef37 AC |
2939 | /* We stepped onto an instruction that needs to be stepped |
2940 | again before re-inserting the breakpoint, do so. */ | |
99619bea | 2941 | tp->stepping_over_breakpoint = 1; |
c906108c SS |
2942 | } |
2943 | else | |
2944 | { | |
515630c5 | 2945 | regcache_write_pc (regcache, addr); |
c906108c SS |
2946 | } |
2947 | ||
70509625 PA |
2948 | if (siggnal != GDB_SIGNAL_DEFAULT) |
2949 | tp->suspend.stop_signal = siggnal; | |
2950 | ||
17b2616c PA |
2951 | /* Record the interpreter that issued the execution command that |
2952 | caused this thread to resume. If the top level interpreter is | |
2953 | MI/async, and the execution command was a CLI command | |
2954 | (next/step/etc.), we'll want to print stop event output to the MI | |
2955 | console channel (the stepped-to line, etc.), as if the user | |
2956 | entered the execution command on a real GDB console. */ | |
4d9d9d04 PA |
2957 | tp->control.command_interp = command_interp (); |
2958 | ||
2959 | resume_ptid = user_visible_resume_ptid (tp->control.stepping_command); | |
2960 | ||
2961 | /* If an exception is thrown from this point on, make sure to | |
2962 | propagate GDB's knowledge of the executing state to the | |
2963 | frontend/user running state. */ | |
2964 | old_chain = make_cleanup (finish_thread_state_cleanup, &resume_ptid); | |
2965 | ||
2966 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
2967 | threads (e.g., we might need to set threads stepping over | |
2968 | breakpoints first), from the user/frontend's point of view, all | |
2969 | threads in RESUME_PTID are now running. Unless we're calling an | |
2970 | inferior function, as in that case we pretend the inferior | |
2971 | doesn't run at all. */ | |
2972 | if (!tp->control.in_infcall) | |
2973 | set_running (resume_ptid, 1); | |
17b2616c | 2974 | |
527159b7 | 2975 | if (debug_infrun) |
8a9de0e4 | 2976 | fprintf_unfiltered (gdb_stdlog, |
64ce06e4 | 2977 | "infrun: proceed (addr=%s, signal=%s)\n", |
c9737c08 | 2978 | paddress (gdbarch, addr), |
64ce06e4 | 2979 | gdb_signal_to_symbol_string (siggnal)); |
527159b7 | 2980 | |
4d9d9d04 PA |
2981 | annotate_starting (); |
2982 | ||
2983 | /* Make sure that output from GDB appears before output from the | |
2984 | inferior. */ | |
2985 | gdb_flush (gdb_stdout); | |
2986 | ||
2987 | /* In a multi-threaded task we may select another thread and | |
2988 | then continue or step. | |
2989 | ||
2990 | But if a thread that we're resuming had stopped at a breakpoint, | |
2991 | it will immediately cause another breakpoint stop without any | |
2992 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
2993 | we must step over it first. | |
2994 | ||
2995 | Look for threads other than the current (TP) that reported a | |
2996 | breakpoint hit and haven't been resumed yet since. */ | |
2997 | ||
2998 | /* If scheduler locking applies, we can avoid iterating over all | |
2999 | threads. */ | |
3000 | if (!non_stop && !schedlock_applies (tp)) | |
94cc34af | 3001 | { |
4d9d9d04 PA |
3002 | struct thread_info *current = tp; |
3003 | ||
3004 | ALL_NON_EXITED_THREADS (tp) | |
3005 | { | |
3006 | /* Ignore the current thread here. It's handled | |
3007 | afterwards. */ | |
3008 | if (tp == current) | |
3009 | continue; | |
99619bea | 3010 | |
4d9d9d04 PA |
3011 | /* Ignore threads of processes we're not resuming. */ |
3012 | if (!ptid_match (tp->ptid, resume_ptid)) | |
3013 | continue; | |
c906108c | 3014 | |
4d9d9d04 PA |
3015 | if (!thread_still_needs_step_over (tp)) |
3016 | continue; | |
3017 | ||
3018 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3019 | |
99619bea PA |
3020 | if (debug_infrun) |
3021 | fprintf_unfiltered (gdb_stdlog, | |
3022 | "infrun: need to step-over [%s] first\n", | |
4d9d9d04 | 3023 | target_pid_to_str (tp->ptid)); |
99619bea | 3024 | |
4d9d9d04 | 3025 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3026 | } |
31e77af2 | 3027 | |
4d9d9d04 | 3028 | tp = current; |
30852783 UW |
3029 | } |
3030 | ||
4d9d9d04 PA |
3031 | /* Enqueue the current thread last, so that we move all other |
3032 | threads over their breakpoints first. */ | |
3033 | if (tp->stepping_over_breakpoint) | |
3034 | thread_step_over_chain_enqueue (tp); | |
30852783 | 3035 | |
4d9d9d04 PA |
3036 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3037 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3038 | advanced. Must do this before resuming any thread, as in | |
3039 | all-stop/remote, once we resume we can't send any other packet | |
3040 | until the target stops again. */ | |
3041 | tp->prev_pc = regcache_read_pc (regcache); | |
99619bea | 3042 | |
4d9d9d04 | 3043 | started = start_step_over (); |
c906108c | 3044 | |
4d9d9d04 PA |
3045 | if (step_over_info_valid_p ()) |
3046 | { | |
3047 | /* Either this thread started a new in-line step over, or some | |
3048 | other thread was already doing one. In either case, don't | |
3049 | resume anything else until the step-over is finished. */ | |
3050 | } | |
fbea99ea | 3051 | else if (started && !target_is_non_stop_p ()) |
4d9d9d04 PA |
3052 | { |
3053 | /* A new displaced stepping sequence was started. In all-stop, | |
3054 | we can't talk to the target anymore until it next stops. */ | |
3055 | } | |
fbea99ea PA |
3056 | else if (!non_stop && target_is_non_stop_p ()) |
3057 | { | |
3058 | /* In all-stop, but the target is always in non-stop mode. | |
3059 | Start all other threads that are implicitly resumed too. */ | |
3060 | ALL_NON_EXITED_THREADS (tp) | |
3061 | { | |
3062 | /* Ignore threads of processes we're not resuming. */ | |
3063 | if (!ptid_match (tp->ptid, resume_ptid)) | |
3064 | continue; | |
3065 | ||
3066 | if (tp->resumed) | |
3067 | { | |
3068 | if (debug_infrun) | |
3069 | fprintf_unfiltered (gdb_stdlog, | |
3070 | "infrun: proceed: [%s] resumed\n", | |
3071 | target_pid_to_str (tp->ptid)); | |
3072 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
3073 | continue; | |
3074 | } | |
3075 | ||
3076 | if (thread_is_in_step_over_chain (tp)) | |
3077 | { | |
3078 | if (debug_infrun) | |
3079 | fprintf_unfiltered (gdb_stdlog, | |
3080 | "infrun: proceed: [%s] needs step-over\n", | |
3081 | target_pid_to_str (tp->ptid)); | |
3082 | continue; | |
3083 | } | |
3084 | ||
3085 | if (debug_infrun) | |
3086 | fprintf_unfiltered (gdb_stdlog, | |
3087 | "infrun: proceed: resuming %s\n", | |
3088 | target_pid_to_str (tp->ptid)); | |
3089 | ||
3090 | reset_ecs (ecs, tp); | |
3091 | switch_to_thread (tp->ptid); | |
3092 | keep_going_pass_signal (ecs); | |
3093 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3094 | error (_("Command aborted.")); |
fbea99ea PA |
3095 | } |
3096 | } | |
372316f1 | 3097 | else if (!tp->resumed && !thread_is_in_step_over_chain (tp)) |
4d9d9d04 PA |
3098 | { |
3099 | /* The thread wasn't started, and isn't queued, run it now. */ | |
3100 | reset_ecs (ecs, tp); | |
3101 | switch_to_thread (tp->ptid); | |
3102 | keep_going_pass_signal (ecs); | |
3103 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3104 | error (_("Command aborted.")); |
4d9d9d04 | 3105 | } |
c906108c | 3106 | |
4d9d9d04 | 3107 | discard_cleanups (old_chain); |
c906108c | 3108 | |
0b333c5e PA |
3109 | /* Tell the event loop to wait for it to stop. If the target |
3110 | supports asynchronous execution, it'll do this from within | |
3111 | target_resume. */ | |
362646f5 | 3112 | if (!target_can_async_p ()) |
0b333c5e | 3113 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3114 | } |
c906108c SS |
3115 | \f |
3116 | ||
3117 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3118 | |
c906108c | 3119 | void |
8621d6a9 | 3120 | start_remote (int from_tty) |
c906108c | 3121 | { |
d6b48e9c | 3122 | struct inferior *inferior; |
d6b48e9c PA |
3123 | |
3124 | inferior = current_inferior (); | |
16c381f0 | 3125 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; |
43ff13b4 | 3126 | |
1777feb0 | 3127 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3128 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3129 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3130 | nothing is returned (instead of just blocking). Because of this, |
3131 | targets expecting an immediate response need to, internally, set | |
3132 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3133 | timeout. */ |
6426a772 JM |
3134 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3135 | differentiate to its caller what the state of the target is after | |
3136 | the initial open has been performed. Here we're assuming that | |
3137 | the target has stopped. It should be possible to eventually have | |
3138 | target_open() return to the caller an indication that the target | |
3139 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3140 | for an async run. */ |
e4c8541f | 3141 | wait_for_inferior (); |
8621d6a9 DJ |
3142 | |
3143 | /* Now that the inferior has stopped, do any bookkeeping like | |
3144 | loading shared libraries. We want to do this before normal_stop, | |
3145 | so that the displayed frame is up to date. */ | |
3146 | post_create_inferior (¤t_target, from_tty); | |
3147 | ||
6426a772 | 3148 | normal_stop (); |
c906108c SS |
3149 | } |
3150 | ||
3151 | /* Initialize static vars when a new inferior begins. */ | |
3152 | ||
3153 | void | |
96baa820 | 3154 | init_wait_for_inferior (void) |
c906108c SS |
3155 | { |
3156 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3157 | |
c906108c SS |
3158 | breakpoint_init_inferior (inf_starting); |
3159 | ||
70509625 | 3160 | clear_proceed_status (0); |
9f976b41 | 3161 | |
ca005067 | 3162 | target_last_wait_ptid = minus_one_ptid; |
237fc4c9 | 3163 | |
842951eb | 3164 | previous_inferior_ptid = inferior_ptid; |
0d1e5fa7 | 3165 | |
edb3359d DJ |
3166 | /* Discard any skipped inlined frames. */ |
3167 | clear_inline_frame_state (minus_one_ptid); | |
c906108c | 3168 | } |
237fc4c9 | 3169 | |
c906108c | 3170 | \f |
488f131b | 3171 | |
ec9499be | 3172 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3173 | |
568d6575 UW |
3174 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3175 | struct execution_control_state *ecs); | |
3176 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3177 | struct execution_control_state *ecs); | |
4f5d7f63 | 3178 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3179 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3180 | struct frame_info *); |
611c83ae | 3181 | |
bdc36728 | 3182 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3183 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3184 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3185 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3186 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3187 | |
252fbfc8 PA |
3188 | /* Callback for iterate over threads. If the thread is stopped, but |
3189 | the user/frontend doesn't know about that yet, go through | |
3190 | normal_stop, as if the thread had just stopped now. ARG points at | |
3191 | a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If | |
3192 | ptid_is_pid(PTID) is true, applies to all threads of the process | |
3193 | pointed at by PTID. Otherwise, apply only to the thread pointed by | |
3194 | PTID. */ | |
3195 | ||
3196 | static int | |
3197 | infrun_thread_stop_requested_callback (struct thread_info *info, void *arg) | |
3198 | { | |
3199 | ptid_t ptid = * (ptid_t *) arg; | |
3200 | ||
3201 | if ((ptid_equal (info->ptid, ptid) | |
3202 | || ptid_equal (minus_one_ptid, ptid) | |
3203 | || (ptid_is_pid (ptid) | |
3204 | && ptid_get_pid (ptid) == ptid_get_pid (info->ptid))) | |
3205 | && is_running (info->ptid) | |
3206 | && !is_executing (info->ptid)) | |
3207 | { | |
3208 | struct cleanup *old_chain; | |
3209 | struct execution_control_state ecss; | |
3210 | struct execution_control_state *ecs = &ecss; | |
3211 | ||
3212 | memset (ecs, 0, sizeof (*ecs)); | |
3213 | ||
3214 | old_chain = make_cleanup_restore_current_thread (); | |
3215 | ||
f15cb84a YQ |
3216 | overlay_cache_invalid = 1; |
3217 | /* Flush target cache before starting to handle each event. | |
3218 | Target was running and cache could be stale. This is just a | |
3219 | heuristic. Running threads may modify target memory, but we | |
3220 | don't get any event. */ | |
3221 | target_dcache_invalidate (); | |
3222 | ||
252fbfc8 PA |
3223 | /* Go through handle_inferior_event/normal_stop, so we always |
3224 | have consistent output as if the stop event had been | |
3225 | reported. */ | |
3226 | ecs->ptid = info->ptid; | |
243a9253 | 3227 | ecs->event_thread = info; |
252fbfc8 | 3228 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; |
a493e3e2 | 3229 | ecs->ws.value.sig = GDB_SIGNAL_0; |
252fbfc8 PA |
3230 | |
3231 | handle_inferior_event (ecs); | |
3232 | ||
3233 | if (!ecs->wait_some_more) | |
3234 | { | |
243a9253 PA |
3235 | /* Cancel any running execution command. */ |
3236 | thread_cancel_execution_command (info); | |
3237 | ||
252fbfc8 | 3238 | normal_stop (); |
252fbfc8 PA |
3239 | } |
3240 | ||
3241 | do_cleanups (old_chain); | |
3242 | } | |
3243 | ||
3244 | return 0; | |
3245 | } | |
3246 | ||
3247 | /* This function is attached as a "thread_stop_requested" observer. | |
3248 | Cleanup local state that assumed the PTID was to be resumed, and | |
3249 | report the stop to the frontend. */ | |
3250 | ||
2c0b251b | 3251 | static void |
252fbfc8 PA |
3252 | infrun_thread_stop_requested (ptid_t ptid) |
3253 | { | |
c2829269 | 3254 | struct thread_info *tp; |
252fbfc8 | 3255 | |
c2829269 PA |
3256 | /* PTID was requested to stop. Remove matching threads from the |
3257 | step-over queue, so we don't try to resume them | |
3258 | automatically. */ | |
3259 | ALL_NON_EXITED_THREADS (tp) | |
3260 | if (ptid_match (tp->ptid, ptid)) | |
3261 | { | |
3262 | if (thread_is_in_step_over_chain (tp)) | |
3263 | thread_step_over_chain_remove (tp); | |
3264 | } | |
252fbfc8 PA |
3265 | |
3266 | iterate_over_threads (infrun_thread_stop_requested_callback, &ptid); | |
3267 | } | |
3268 | ||
a07daef3 PA |
3269 | static void |
3270 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3271 | { | |
3272 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
3273 | nullify_last_target_wait_ptid (); | |
3274 | } | |
3275 | ||
0cbcdb96 PA |
3276 | /* Delete the step resume, single-step and longjmp/exception resume |
3277 | breakpoints of TP. */ | |
4e1c45ea | 3278 | |
0cbcdb96 PA |
3279 | static void |
3280 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3281 | { |
0cbcdb96 PA |
3282 | delete_step_resume_breakpoint (tp); |
3283 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3284 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3285 | } |
3286 | ||
0cbcdb96 PA |
3287 | /* If the target still has execution, call FUNC for each thread that |
3288 | just stopped. In all-stop, that's all the non-exited threads; in | |
3289 | non-stop, that's the current thread, only. */ | |
3290 | ||
3291 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3292 | (struct thread_info *tp); | |
4e1c45ea PA |
3293 | |
3294 | static void | |
0cbcdb96 | 3295 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3296 | { |
0cbcdb96 | 3297 | if (!target_has_execution || ptid_equal (inferior_ptid, null_ptid)) |
4e1c45ea PA |
3298 | return; |
3299 | ||
fbea99ea | 3300 | if (target_is_non_stop_p ()) |
4e1c45ea | 3301 | { |
0cbcdb96 PA |
3302 | /* If in non-stop mode, only the current thread stopped. */ |
3303 | func (inferior_thread ()); | |
4e1c45ea PA |
3304 | } |
3305 | else | |
0cbcdb96 PA |
3306 | { |
3307 | struct thread_info *tp; | |
3308 | ||
3309 | /* In all-stop mode, all threads have stopped. */ | |
3310 | ALL_NON_EXITED_THREADS (tp) | |
3311 | { | |
3312 | func (tp); | |
3313 | } | |
3314 | } | |
3315 | } | |
3316 | ||
3317 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3318 | the threads that just stopped. */ | |
3319 | ||
3320 | static void | |
3321 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3322 | { | |
3323 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3324 | } |
3325 | ||
3326 | /* Delete the single-step breakpoints of the threads that just | |
3327 | stopped. */ | |
7c16b83e | 3328 | |
34b7e8a6 PA |
3329 | static void |
3330 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3331 | { | |
3332 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3333 | } |
3334 | ||
1777feb0 | 3335 | /* A cleanup wrapper. */ |
4e1c45ea PA |
3336 | |
3337 | static void | |
0cbcdb96 | 3338 | delete_just_stopped_threads_infrun_breakpoints_cleanup (void *arg) |
4e1c45ea | 3339 | { |
0cbcdb96 | 3340 | delete_just_stopped_threads_infrun_breakpoints (); |
4e1c45ea PA |
3341 | } |
3342 | ||
221e1a37 | 3343 | /* See infrun.h. */ |
223698f8 | 3344 | |
221e1a37 | 3345 | void |
223698f8 DE |
3346 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3347 | const struct target_waitstatus *ws) | |
3348 | { | |
3349 | char *status_string = target_waitstatus_to_string (ws); | |
3350 | struct ui_file *tmp_stream = mem_fileopen (); | |
3351 | char *text; | |
223698f8 DE |
3352 | |
3353 | /* The text is split over several lines because it was getting too long. | |
3354 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3355 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3356 | is set. */ | |
3357 | ||
3358 | fprintf_unfiltered (tmp_stream, | |
1176ecec PA |
3359 | "infrun: target_wait (%d.%ld.%ld", |
3360 | ptid_get_pid (waiton_ptid), | |
3361 | ptid_get_lwp (waiton_ptid), | |
3362 | ptid_get_tid (waiton_ptid)); | |
dfd4cc63 | 3363 | if (ptid_get_pid (waiton_ptid) != -1) |
223698f8 DE |
3364 | fprintf_unfiltered (tmp_stream, |
3365 | " [%s]", target_pid_to_str (waiton_ptid)); | |
3366 | fprintf_unfiltered (tmp_stream, ", status) =\n"); | |
3367 | fprintf_unfiltered (tmp_stream, | |
1176ecec | 3368 | "infrun: %d.%ld.%ld [%s],\n", |
dfd4cc63 | 3369 | ptid_get_pid (result_ptid), |
1176ecec PA |
3370 | ptid_get_lwp (result_ptid), |
3371 | ptid_get_tid (result_ptid), | |
dfd4cc63 | 3372 | target_pid_to_str (result_ptid)); |
223698f8 DE |
3373 | fprintf_unfiltered (tmp_stream, |
3374 | "infrun: %s\n", | |
3375 | status_string); | |
3376 | ||
759ef836 | 3377 | text = ui_file_xstrdup (tmp_stream, NULL); |
223698f8 DE |
3378 | |
3379 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3380 | a gcc error: the format attribute requires a string literal. */ | |
3381 | fprintf_unfiltered (gdb_stdlog, "%s", text); | |
3382 | ||
3383 | xfree (status_string); | |
3384 | xfree (text); | |
3385 | ui_file_delete (tmp_stream); | |
3386 | } | |
3387 | ||
372316f1 PA |
3388 | /* Select a thread at random, out of those which are resumed and have |
3389 | had events. */ | |
3390 | ||
3391 | static struct thread_info * | |
3392 | random_pending_event_thread (ptid_t waiton_ptid) | |
3393 | { | |
3394 | struct thread_info *event_tp; | |
3395 | int num_events = 0; | |
3396 | int random_selector; | |
3397 | ||
3398 | /* First see how many events we have. Count only resumed threads | |
3399 | that have an event pending. */ | |
3400 | ALL_NON_EXITED_THREADS (event_tp) | |
3401 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3402 | && event_tp->resumed | |
3403 | && event_tp->suspend.waitstatus_pending_p) | |
3404 | num_events++; | |
3405 | ||
3406 | if (num_events == 0) | |
3407 | return NULL; | |
3408 | ||
3409 | /* Now randomly pick a thread out of those that have had events. */ | |
3410 | random_selector = (int) | |
3411 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
3412 | ||
3413 | if (debug_infrun && num_events > 1) | |
3414 | fprintf_unfiltered (gdb_stdlog, | |
3415 | "infrun: Found %d events, selecting #%d\n", | |
3416 | num_events, random_selector); | |
3417 | ||
3418 | /* Select the Nth thread that has had an event. */ | |
3419 | ALL_NON_EXITED_THREADS (event_tp) | |
3420 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3421 | && event_tp->resumed | |
3422 | && event_tp->suspend.waitstatus_pending_p) | |
3423 | if (random_selector-- == 0) | |
3424 | break; | |
3425 | ||
3426 | return event_tp; | |
3427 | } | |
3428 | ||
3429 | /* Wrapper for target_wait that first checks whether threads have | |
3430 | pending statuses to report before actually asking the target for | |
3431 | more events. */ | |
3432 | ||
3433 | static ptid_t | |
3434 | do_target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
3435 | { | |
3436 | ptid_t event_ptid; | |
3437 | struct thread_info *tp; | |
3438 | ||
3439 | /* First check if there is a resumed thread with a wait status | |
3440 | pending. */ | |
3441 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) | |
3442 | { | |
3443 | tp = random_pending_event_thread (ptid); | |
3444 | } | |
3445 | else | |
3446 | { | |
3447 | if (debug_infrun) | |
3448 | fprintf_unfiltered (gdb_stdlog, | |
3449 | "infrun: Waiting for specific thread %s.\n", | |
3450 | target_pid_to_str (ptid)); | |
3451 | ||
3452 | /* We have a specific thread to check. */ | |
3453 | tp = find_thread_ptid (ptid); | |
3454 | gdb_assert (tp != NULL); | |
3455 | if (!tp->suspend.waitstatus_pending_p) | |
3456 | tp = NULL; | |
3457 | } | |
3458 | ||
3459 | if (tp != NULL | |
3460 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3461 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3462 | { | |
3463 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
3464 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3465 | CORE_ADDR pc; | |
3466 | int discard = 0; | |
3467 | ||
3468 | pc = regcache_read_pc (regcache); | |
3469 | ||
3470 | if (pc != tp->suspend.stop_pc) | |
3471 | { | |
3472 | if (debug_infrun) | |
3473 | fprintf_unfiltered (gdb_stdlog, | |
3474 | "infrun: PC of %s changed. was=%s, now=%s\n", | |
3475 | target_pid_to_str (tp->ptid), | |
3476 | paddress (gdbarch, tp->prev_pc), | |
3477 | paddress (gdbarch, pc)); | |
3478 | discard = 1; | |
3479 | } | |
3480 | else if (!breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3481 | { | |
3482 | if (debug_infrun) | |
3483 | fprintf_unfiltered (gdb_stdlog, | |
3484 | "infrun: previous breakpoint of %s, at %s gone\n", | |
3485 | target_pid_to_str (tp->ptid), | |
3486 | paddress (gdbarch, pc)); | |
3487 | ||
3488 | discard = 1; | |
3489 | } | |
3490 | ||
3491 | if (discard) | |
3492 | { | |
3493 | if (debug_infrun) | |
3494 | fprintf_unfiltered (gdb_stdlog, | |
3495 | "infrun: pending event of %s cancelled.\n", | |
3496 | target_pid_to_str (tp->ptid)); | |
3497 | ||
3498 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3499 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3500 | } | |
3501 | } | |
3502 | ||
3503 | if (tp != NULL) | |
3504 | { | |
3505 | if (debug_infrun) | |
3506 | { | |
3507 | char *statstr; | |
3508 | ||
3509 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
3510 | fprintf_unfiltered (gdb_stdlog, | |
3511 | "infrun: Using pending wait status %s for %s.\n", | |
3512 | statstr, | |
3513 | target_pid_to_str (tp->ptid)); | |
3514 | xfree (statstr); | |
3515 | } | |
3516 | ||
3517 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3518 | if it was a software breakpoint (and the target doesn't | |
3519 | always adjust the PC itself). */ | |
3520 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3521 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3522 | { | |
3523 | struct regcache *regcache; | |
3524 | struct gdbarch *gdbarch; | |
3525 | int decr_pc; | |
3526 | ||
3527 | regcache = get_thread_regcache (tp->ptid); | |
3528 | gdbarch = get_regcache_arch (regcache); | |
3529 | ||
3530 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3531 | if (decr_pc != 0) | |
3532 | { | |
3533 | CORE_ADDR pc; | |
3534 | ||
3535 | pc = regcache_read_pc (regcache); | |
3536 | regcache_write_pc (regcache, pc + decr_pc); | |
3537 | } | |
3538 | } | |
3539 | ||
3540 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3541 | *status = tp->suspend.waitstatus; | |
3542 | tp->suspend.waitstatus_pending_p = 0; | |
3543 | ||
3544 | /* Wake up the event loop again, until all pending events are | |
3545 | processed. */ | |
3546 | if (target_is_async_p ()) | |
3547 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3548 | return tp->ptid; | |
3549 | } | |
3550 | ||
3551 | /* But if we don't find one, we'll have to wait. */ | |
3552 | ||
3553 | if (deprecated_target_wait_hook) | |
3554 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3555 | else | |
3556 | event_ptid = target_wait (ptid, status, options); | |
3557 | ||
3558 | return event_ptid; | |
3559 | } | |
3560 | ||
24291992 PA |
3561 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3562 | detaching while a thread is displaced stepping is a recipe for | |
3563 | crashing it, as nothing would readjust the PC out of the scratch | |
3564 | pad. */ | |
3565 | ||
3566 | void | |
3567 | prepare_for_detach (void) | |
3568 | { | |
3569 | struct inferior *inf = current_inferior (); | |
3570 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
3571 | struct cleanup *old_chain_1; | |
3572 | struct displaced_step_inferior_state *displaced; | |
3573 | ||
3574 | displaced = get_displaced_stepping_state (inf->pid); | |
3575 | ||
3576 | /* Is any thread of this process displaced stepping? If not, | |
3577 | there's nothing else to do. */ | |
3578 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
3579 | return; | |
3580 | ||
3581 | if (debug_infrun) | |
3582 | fprintf_unfiltered (gdb_stdlog, | |
3583 | "displaced-stepping in-process while detaching"); | |
3584 | ||
3585 | old_chain_1 = make_cleanup_restore_integer (&inf->detaching); | |
3586 | inf->detaching = 1; | |
3587 | ||
3588 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
3589 | { | |
3590 | struct cleanup *old_chain_2; | |
3591 | struct execution_control_state ecss; | |
3592 | struct execution_control_state *ecs; | |
3593 | ||
3594 | ecs = &ecss; | |
3595 | memset (ecs, 0, sizeof (*ecs)); | |
3596 | ||
3597 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3598 | /* Flush target cache before starting to handle each event. |
3599 | Target was running and cache could be stale. This is just a | |
3600 | heuristic. Running threads may modify target memory, but we | |
3601 | don't get any event. */ | |
3602 | target_dcache_invalidate (); | |
24291992 | 3603 | |
372316f1 | 3604 | ecs->ptid = do_target_wait (pid_ptid, &ecs->ws, 0); |
24291992 PA |
3605 | |
3606 | if (debug_infrun) | |
3607 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3608 | ||
3609 | /* If an error happens while handling the event, propagate GDB's | |
3610 | knowledge of the executing state to the frontend/user running | |
3611 | state. */ | |
3e43a32a MS |
3612 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, |
3613 | &minus_one_ptid); | |
24291992 PA |
3614 | |
3615 | /* Now figure out what to do with the result of the result. */ | |
3616 | handle_inferior_event (ecs); | |
3617 | ||
3618 | /* No error, don't finish the state yet. */ | |
3619 | discard_cleanups (old_chain_2); | |
3620 | ||
3621 | /* Breakpoints and watchpoints are not installed on the target | |
3622 | at this point, and signals are passed directly to the | |
3623 | inferior, so this must mean the process is gone. */ | |
3624 | if (!ecs->wait_some_more) | |
3625 | { | |
3626 | discard_cleanups (old_chain_1); | |
3627 | error (_("Program exited while detaching")); | |
3628 | } | |
3629 | } | |
3630 | ||
3631 | discard_cleanups (old_chain_1); | |
3632 | } | |
3633 | ||
cd0fc7c3 | 3634 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3635 | |
cd0fc7c3 SS |
3636 | If inferior gets a signal, we may decide to start it up again |
3637 | instead of returning. That is why there is a loop in this function. | |
3638 | When this function actually returns it means the inferior | |
3639 | should be left stopped and GDB should read more commands. */ | |
3640 | ||
3641 | void | |
e4c8541f | 3642 | wait_for_inferior (void) |
cd0fc7c3 SS |
3643 | { |
3644 | struct cleanup *old_cleanups; | |
e6f5c25b | 3645 | struct cleanup *thread_state_chain; |
c906108c | 3646 | |
527159b7 | 3647 | if (debug_infrun) |
ae123ec6 | 3648 | fprintf_unfiltered |
e4c8541f | 3649 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3650 | |
0cbcdb96 PA |
3651 | old_cleanups |
3652 | = make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, | |
3653 | NULL); | |
cd0fc7c3 | 3654 | |
e6f5c25b PA |
3655 | /* If an error happens while handling the event, propagate GDB's |
3656 | knowledge of the executing state to the frontend/user running | |
3657 | state. */ | |
3658 | thread_state_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
3659 | ||
c906108c SS |
3660 | while (1) |
3661 | { | |
ae25568b PA |
3662 | struct execution_control_state ecss; |
3663 | struct execution_control_state *ecs = &ecss; | |
963f9c80 | 3664 | ptid_t waiton_ptid = minus_one_ptid; |
29f49a6a | 3665 | |
ae25568b PA |
3666 | memset (ecs, 0, sizeof (*ecs)); |
3667 | ||
ec9499be | 3668 | overlay_cache_invalid = 1; |
ec9499be | 3669 | |
f15cb84a YQ |
3670 | /* Flush target cache before starting to handle each event. |
3671 | Target was running and cache could be stale. This is just a | |
3672 | heuristic. Running threads may modify target memory, but we | |
3673 | don't get any event. */ | |
3674 | target_dcache_invalidate (); | |
3675 | ||
372316f1 | 3676 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 3677 | |
f00150c9 | 3678 | if (debug_infrun) |
223698f8 | 3679 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3680 | |
cd0fc7c3 SS |
3681 | /* Now figure out what to do with the result of the result. */ |
3682 | handle_inferior_event (ecs); | |
c906108c | 3683 | |
cd0fc7c3 SS |
3684 | if (!ecs->wait_some_more) |
3685 | break; | |
3686 | } | |
4e1c45ea | 3687 | |
e6f5c25b PA |
3688 | /* No error, don't finish the state yet. */ |
3689 | discard_cleanups (thread_state_chain); | |
3690 | ||
cd0fc7c3 SS |
3691 | do_cleanups (old_cleanups); |
3692 | } | |
c906108c | 3693 | |
d3d4baed PA |
3694 | /* Cleanup that reinstalls the readline callback handler, if the |
3695 | target is running in the background. If while handling the target | |
3696 | event something triggered a secondary prompt, like e.g., a | |
3697 | pagination prompt, we'll have removed the callback handler (see | |
3698 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3699 | event loop, ready to process further input. Note this has no | |
3700 | effect if the handler hasn't actually been removed, because calling | |
3701 | rl_callback_handler_install resets the line buffer, thus losing | |
3702 | input. */ | |
3703 | ||
3704 | static void | |
3705 | reinstall_readline_callback_handler_cleanup (void *arg) | |
3706 | { | |
6c400b59 PA |
3707 | if (!interpreter_async) |
3708 | { | |
3709 | /* We're not going back to the top level event loop yet. Don't | |
3710 | install the readline callback, as it'd prep the terminal, | |
3711 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3712 | it the next time the prompt is displayed, when we're ready | |
3713 | for input. */ | |
3714 | return; | |
3715 | } | |
3716 | ||
d3d4baed PA |
3717 | if (async_command_editing_p && !sync_execution) |
3718 | gdb_rl_callback_handler_reinstall (); | |
3719 | } | |
3720 | ||
243a9253 PA |
3721 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3722 | that's just the event thread. In all-stop, that's all threads. */ | |
3723 | ||
3724 | static void | |
3725 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3726 | { | |
3727 | struct thread_info *thr = ecs->event_thread; | |
3728 | ||
3729 | if (thr != NULL && thr->thread_fsm != NULL) | |
3730 | thread_fsm_clean_up (thr->thread_fsm); | |
3731 | ||
3732 | if (!non_stop) | |
3733 | { | |
3734 | ALL_NON_EXITED_THREADS (thr) | |
3735 | { | |
3736 | if (thr->thread_fsm == NULL) | |
3737 | continue; | |
3738 | if (thr == ecs->event_thread) | |
3739 | continue; | |
3740 | ||
3741 | switch_to_thread (thr->ptid); | |
3742 | thread_fsm_clean_up (thr->thread_fsm); | |
3743 | } | |
3744 | ||
3745 | if (ecs->event_thread != NULL) | |
3746 | switch_to_thread (ecs->event_thread->ptid); | |
3747 | } | |
3748 | } | |
3749 | ||
1777feb0 | 3750 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3751 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3752 | descriptor corresponding to the target. It can be called more than |
3753 | once to complete a single execution command. In such cases we need | |
3754 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3755 | that this function is called for a single execution command, then |
3756 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3757 | necessary cleanups. */ |
43ff13b4 JM |
3758 | |
3759 | void | |
fba45db2 | 3760 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3761 | { |
0d1e5fa7 | 3762 | struct execution_control_state ecss; |
a474d7c2 | 3763 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 3764 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 3765 | struct cleanup *ts_old_chain; |
4f8d22e3 | 3766 | int was_sync = sync_execution; |
0f641c01 | 3767 | int cmd_done = 0; |
963f9c80 | 3768 | ptid_t waiton_ptid = minus_one_ptid; |
43ff13b4 | 3769 | |
0d1e5fa7 PA |
3770 | memset (ecs, 0, sizeof (*ecs)); |
3771 | ||
d3d4baed PA |
3772 | /* End up with readline processing input, if necessary. */ |
3773 | make_cleanup (reinstall_readline_callback_handler_cleanup, NULL); | |
3774 | ||
c5187ac6 PA |
3775 | /* We're handling a live event, so make sure we're doing live |
3776 | debugging. If we're looking at traceframes while the target is | |
3777 | running, we're going to need to get back to that mode after | |
3778 | handling the event. */ | |
3779 | if (non_stop) | |
3780 | { | |
3781 | make_cleanup_restore_current_traceframe (); | |
e6e4e701 | 3782 | set_current_traceframe (-1); |
c5187ac6 PA |
3783 | } |
3784 | ||
4f8d22e3 PA |
3785 | if (non_stop) |
3786 | /* In non-stop mode, the user/frontend should not notice a thread | |
3787 | switch due to internal events. Make sure we reverse to the | |
3788 | user selected thread and frame after handling the event and | |
3789 | running any breakpoint commands. */ | |
3790 | make_cleanup_restore_current_thread (); | |
3791 | ||
ec9499be | 3792 | overlay_cache_invalid = 1; |
f15cb84a YQ |
3793 | /* Flush target cache before starting to handle each event. Target |
3794 | was running and cache could be stale. This is just a heuristic. | |
3795 | Running threads may modify target memory, but we don't get any | |
3796 | event. */ | |
3797 | target_dcache_invalidate (); | |
3dd5b83d | 3798 | |
32231432 PA |
3799 | make_cleanup_restore_integer (&execution_direction); |
3800 | execution_direction = target_execution_direction (); | |
3801 | ||
0b333c5e PA |
3802 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, |
3803 | target_can_async_p () ? TARGET_WNOHANG : 0); | |
43ff13b4 | 3804 | |
f00150c9 | 3805 | if (debug_infrun) |
223698f8 | 3806 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3807 | |
29f49a6a PA |
3808 | /* If an error happens while handling the event, propagate GDB's |
3809 | knowledge of the executing state to the frontend/user running | |
3810 | state. */ | |
fbea99ea | 3811 | if (!target_is_non_stop_p ()) |
29f49a6a PA |
3812 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); |
3813 | else | |
3814 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
3815 | ||
353d1d73 JK |
3816 | /* Get executed before make_cleanup_restore_current_thread above to apply |
3817 | still for the thread which has thrown the exception. */ | |
3818 | make_bpstat_clear_actions_cleanup (); | |
3819 | ||
7c16b83e PA |
3820 | make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, NULL); |
3821 | ||
43ff13b4 | 3822 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 3823 | handle_inferior_event (ecs); |
43ff13b4 | 3824 | |
a474d7c2 | 3825 | if (!ecs->wait_some_more) |
43ff13b4 | 3826 | { |
c9657e70 | 3827 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
243a9253 PA |
3828 | int should_stop = 1; |
3829 | struct thread_info *thr = ecs->event_thread; | |
388a7084 | 3830 | int should_notify_stop = 1; |
d6b48e9c | 3831 | |
0cbcdb96 | 3832 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3833 | |
243a9253 PA |
3834 | if (thr != NULL) |
3835 | { | |
3836 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
3837 | ||
3838 | if (thread_fsm != NULL) | |
3839 | should_stop = thread_fsm_should_stop (thread_fsm); | |
3840 | } | |
3841 | ||
3842 | if (!should_stop) | |
3843 | { | |
3844 | keep_going (ecs); | |
3845 | } | |
c2d11a7d | 3846 | else |
0f641c01 | 3847 | { |
243a9253 PA |
3848 | clean_up_just_stopped_threads_fsms (ecs); |
3849 | ||
388a7084 PA |
3850 | if (thr != NULL && thr->thread_fsm != NULL) |
3851 | { | |
3852 | should_notify_stop | |
3853 | = thread_fsm_should_notify_stop (thr->thread_fsm); | |
3854 | } | |
3855 | ||
3856 | if (should_notify_stop) | |
3857 | { | |
3858 | /* We may not find an inferior if this was a process exit. */ | |
3859 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
3860 | normal_stop (); | |
243a9253 | 3861 | |
388a7084 PA |
3862 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); |
3863 | cmd_done = 1; | |
3864 | } | |
0f641c01 | 3865 | } |
43ff13b4 | 3866 | } |
4f8d22e3 | 3867 | |
29f49a6a PA |
3868 | /* No error, don't finish the thread states yet. */ |
3869 | discard_cleanups (ts_old_chain); | |
3870 | ||
4f8d22e3 PA |
3871 | /* Revert thread and frame. */ |
3872 | do_cleanups (old_chain); | |
3873 | ||
3874 | /* If the inferior was in sync execution mode, and now isn't, | |
0f641c01 PA |
3875 | restore the prompt (a synchronous execution command has finished, |
3876 | and we're ready for input). */ | |
b4a14fd0 | 3877 | if (interpreter_async && was_sync && !sync_execution) |
92bcb5f9 | 3878 | observer_notify_sync_execution_done (); |
0f641c01 PA |
3879 | |
3880 | if (cmd_done | |
3881 | && !was_sync | |
3882 | && exec_done_display_p | |
3883 | && (ptid_equal (inferior_ptid, null_ptid) | |
3884 | || !is_running (inferior_ptid))) | |
3885 | printf_unfiltered (_("completed.\n")); | |
43ff13b4 JM |
3886 | } |
3887 | ||
edb3359d DJ |
3888 | /* Record the frame and location we're currently stepping through. */ |
3889 | void | |
3890 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
3891 | { | |
3892 | struct thread_info *tp = inferior_thread (); | |
3893 | ||
16c381f0 JK |
3894 | tp->control.step_frame_id = get_frame_id (frame); |
3895 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
3896 | |
3897 | tp->current_symtab = sal.symtab; | |
3898 | tp->current_line = sal.line; | |
3899 | } | |
3900 | ||
0d1e5fa7 PA |
3901 | /* Clear context switchable stepping state. */ |
3902 | ||
3903 | void | |
4e1c45ea | 3904 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 3905 | { |
7f5ef605 | 3906 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 3907 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 3908 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 3909 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
3910 | } |
3911 | ||
c32c64b7 DE |
3912 | /* Set the cached copy of the last ptid/waitstatus. */ |
3913 | ||
3914 | static void | |
3915 | set_last_target_status (ptid_t ptid, struct target_waitstatus status) | |
3916 | { | |
3917 | target_last_wait_ptid = ptid; | |
3918 | target_last_waitstatus = status; | |
3919 | } | |
3920 | ||
e02bc4cc | 3921 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
3922 | target_wait()/deprecated_target_wait_hook(). The data is actually |
3923 | cached by handle_inferior_event(), which gets called immediately | |
3924 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
3925 | |
3926 | void | |
488f131b | 3927 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 3928 | { |
39f77062 | 3929 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
3930 | *status = target_last_waitstatus; |
3931 | } | |
3932 | ||
ac264b3b MS |
3933 | void |
3934 | nullify_last_target_wait_ptid (void) | |
3935 | { | |
3936 | target_last_wait_ptid = minus_one_ptid; | |
3937 | } | |
3938 | ||
dcf4fbde | 3939 | /* Switch thread contexts. */ |
dd80620e MS |
3940 | |
3941 | static void | |
0d1e5fa7 | 3942 | context_switch (ptid_t ptid) |
dd80620e | 3943 | { |
4b51d87b | 3944 | if (debug_infrun && !ptid_equal (ptid, inferior_ptid)) |
fd48f117 DJ |
3945 | { |
3946 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
3947 | target_pid_to_str (inferior_ptid)); | |
3948 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 3949 | target_pid_to_str (ptid)); |
fd48f117 DJ |
3950 | } |
3951 | ||
0d1e5fa7 | 3952 | switch_to_thread (ptid); |
dd80620e MS |
3953 | } |
3954 | ||
d8dd4d5f PA |
3955 | /* If the target can't tell whether we've hit breakpoints |
3956 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
3957 | check whether that could have been caused by a breakpoint. If so, | |
3958 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
3959 | ||
4fa8626c | 3960 | static void |
d8dd4d5f PA |
3961 | adjust_pc_after_break (struct thread_info *thread, |
3962 | struct target_waitstatus *ws) | |
4fa8626c | 3963 | { |
24a73cce UW |
3964 | struct regcache *regcache; |
3965 | struct gdbarch *gdbarch; | |
6c95b8df | 3966 | struct address_space *aspace; |
118e6252 | 3967 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 3968 | |
4fa8626c DJ |
3969 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
3970 | we aren't, just return. | |
9709f61c DJ |
3971 | |
3972 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
3973 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
3974 | implemented by software breakpoints should be handled through the normal | |
3975 | breakpoint layer. | |
8fb3e588 | 3976 | |
4fa8626c DJ |
3977 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
3978 | different signals (SIGILL or SIGEMT for instance), but it is less | |
3979 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
3980 | gdbarch_decr_pc_after_break. I don't know any specific target that |
3981 | generates these signals at breakpoints (the code has been in GDB since at | |
3982 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 3983 | |
e6cf7916 UW |
3984 | In earlier versions of GDB, a target with |
3985 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
3986 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
3987 | target with both of these set in GDB history, and it seems unlikely to be | |
3988 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 3989 | |
d8dd4d5f | 3990 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
3991 | return; |
3992 | ||
d8dd4d5f | 3993 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
3994 | return; |
3995 | ||
4058b839 PA |
3996 | /* In reverse execution, when a breakpoint is hit, the instruction |
3997 | under it has already been de-executed. The reported PC always | |
3998 | points at the breakpoint address, so adjusting it further would | |
3999 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4000 | architecture: | |
4001 | ||
4002 | B1 0x08000000 : INSN1 | |
4003 | B2 0x08000001 : INSN2 | |
4004 | 0x08000002 : INSN3 | |
4005 | PC -> 0x08000003 : INSN4 | |
4006 | ||
4007 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4008 | from that point should hit B2 as below. Reading the PC when the | |
4009 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4010 | been de-executed already. | |
4011 | ||
4012 | B1 0x08000000 : INSN1 | |
4013 | B2 PC -> 0x08000001 : INSN2 | |
4014 | 0x08000002 : INSN3 | |
4015 | 0x08000003 : INSN4 | |
4016 | ||
4017 | We can't apply the same logic as for forward execution, because | |
4018 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4019 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4020 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4021 | behaviour. */ | |
4022 | if (execution_direction == EXEC_REVERSE) | |
4023 | return; | |
4024 | ||
1cf4d951 PA |
4025 | /* If the target can tell whether the thread hit a SW breakpoint, |
4026 | trust it. Targets that can tell also adjust the PC | |
4027 | themselves. */ | |
4028 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4029 | return; | |
4030 | ||
4031 | /* Note that relying on whether a breakpoint is planted in memory to | |
4032 | determine this can fail. E.g,. the breakpoint could have been | |
4033 | removed since. Or the thread could have been told to step an | |
4034 | instruction the size of a breakpoint instruction, and only | |
4035 | _after_ was a breakpoint inserted at its address. */ | |
4036 | ||
24a73cce UW |
4037 | /* If this target does not decrement the PC after breakpoints, then |
4038 | we have nothing to do. */ | |
d8dd4d5f | 4039 | regcache = get_thread_regcache (thread->ptid); |
24a73cce | 4040 | gdbarch = get_regcache_arch (regcache); |
118e6252 | 4041 | |
527a273a | 4042 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4043 | if (decr_pc == 0) |
24a73cce UW |
4044 | return; |
4045 | ||
6c95b8df PA |
4046 | aspace = get_regcache_aspace (regcache); |
4047 | ||
8aad930b AC |
4048 | /* Find the location where (if we've hit a breakpoint) the |
4049 | breakpoint would be. */ | |
118e6252 | 4050 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4051 | |
1cf4d951 PA |
4052 | /* If the target can't tell whether a software breakpoint triggered, |
4053 | fallback to figuring it out based on breakpoints we think were | |
4054 | inserted in the target, and on whether the thread was stepped or | |
4055 | continued. */ | |
4056 | ||
1c5cfe86 PA |
4057 | /* Check whether there actually is a software breakpoint inserted at |
4058 | that location. | |
4059 | ||
4060 | If in non-stop mode, a race condition is possible where we've | |
4061 | removed a breakpoint, but stop events for that breakpoint were | |
4062 | already queued and arrive later. To suppress those spurious | |
4063 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4064 | and retire them after a number of stop events are reported. Note |
4065 | this is an heuristic and can thus get confused. The real fix is | |
4066 | to get the "stopped by SW BP and needs adjustment" info out of | |
4067 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4068 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4069 | || (target_is_non_stop_p () |
4070 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4071 | { |
77f9e713 | 4072 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); |
abbb1732 | 4073 | |
8213266a | 4074 | if (record_full_is_used ()) |
77f9e713 | 4075 | record_full_gdb_operation_disable_set (); |
96429cc8 | 4076 | |
1c0fdd0e UW |
4077 | /* When using hardware single-step, a SIGTRAP is reported for both |
4078 | a completed single-step and a software breakpoint. Need to | |
4079 | differentiate between the two, as the latter needs adjusting | |
4080 | but the former does not. | |
4081 | ||
4082 | The SIGTRAP can be due to a completed hardware single-step only if | |
4083 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4084 | - this thread is currently being stepped |
4085 | ||
4086 | If any of these events did not occur, we must have stopped due | |
4087 | to hitting a software breakpoint, and have to back up to the | |
4088 | breakpoint address. | |
4089 | ||
4090 | As a special case, we could have hardware single-stepped a | |
4091 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4092 | we also need to back up to the breakpoint address. */ | |
4093 | ||
d8dd4d5f PA |
4094 | if (thread_has_single_step_breakpoints_set (thread) |
4095 | || !currently_stepping (thread) | |
4096 | || (thread->stepped_breakpoint | |
4097 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4098 | regcache_write_pc (regcache, breakpoint_pc); |
96429cc8 | 4099 | |
77f9e713 | 4100 | do_cleanups (old_cleanups); |
8aad930b | 4101 | } |
4fa8626c DJ |
4102 | } |
4103 | ||
edb3359d DJ |
4104 | static int |
4105 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4106 | { | |
4107 | for (frame = get_prev_frame (frame); | |
4108 | frame != NULL; | |
4109 | frame = get_prev_frame (frame)) | |
4110 | { | |
4111 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4112 | return 1; | |
4113 | if (get_frame_type (frame) != INLINE_FRAME) | |
4114 | break; | |
4115 | } | |
4116 | ||
4117 | return 0; | |
4118 | } | |
4119 | ||
a96d9b2e SDJ |
4120 | /* Auxiliary function that handles syscall entry/return events. |
4121 | It returns 1 if the inferior should keep going (and GDB | |
4122 | should ignore the event), or 0 if the event deserves to be | |
4123 | processed. */ | |
ca2163eb | 4124 | |
a96d9b2e | 4125 | static int |
ca2163eb | 4126 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4127 | { |
ca2163eb | 4128 | struct regcache *regcache; |
ca2163eb PA |
4129 | int syscall_number; |
4130 | ||
4131 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
4132 | context_switch (ecs->ptid); | |
4133 | ||
4134 | regcache = get_thread_regcache (ecs->ptid); | |
f90263c1 | 4135 | syscall_number = ecs->ws.value.syscall_number; |
ca2163eb PA |
4136 | stop_pc = regcache_read_pc (regcache); |
4137 | ||
a96d9b2e SDJ |
4138 | if (catch_syscall_enabled () > 0 |
4139 | && catching_syscall_number (syscall_number) > 0) | |
4140 | { | |
4141 | if (debug_infrun) | |
4142 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
4143 | syscall_number); | |
a96d9b2e | 4144 | |
16c381f0 | 4145 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4146 | = bpstat_stop_status (get_regcache_aspace (regcache), |
09ac7c10 | 4147 | stop_pc, ecs->ptid, &ecs->ws); |
ab04a2af | 4148 | |
ce12b012 | 4149 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4150 | { |
4151 | /* Catchpoint hit. */ | |
ca2163eb PA |
4152 | return 0; |
4153 | } | |
a96d9b2e | 4154 | } |
ca2163eb PA |
4155 | |
4156 | /* If no catchpoint triggered for this, then keep going. */ | |
ca2163eb PA |
4157 | keep_going (ecs); |
4158 | return 1; | |
a96d9b2e SDJ |
4159 | } |
4160 | ||
7e324e48 GB |
4161 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4162 | ||
4163 | static void | |
4164 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4165 | struct execution_control_state *ecs) | |
4166 | { | |
4167 | if (!ecs->stop_func_filled_in) | |
4168 | { | |
4169 | /* Don't care about return value; stop_func_start and stop_func_name | |
4170 | will both be 0 if it doesn't work. */ | |
4171 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
4172 | &ecs->stop_func_start, &ecs->stop_func_end); | |
4173 | ecs->stop_func_start | |
4174 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4175 | ||
591a12a1 UW |
4176 | if (gdbarch_skip_entrypoint_p (gdbarch)) |
4177 | ecs->stop_func_start = gdbarch_skip_entrypoint (gdbarch, | |
4178 | ecs->stop_func_start); | |
4179 | ||
7e324e48 GB |
4180 | ecs->stop_func_filled_in = 1; |
4181 | } | |
4182 | } | |
4183 | ||
4f5d7f63 PA |
4184 | |
4185 | /* Return the STOP_SOON field of the inferior pointed at by PTID. */ | |
4186 | ||
4187 | static enum stop_kind | |
4188 | get_inferior_stop_soon (ptid_t ptid) | |
4189 | { | |
c9657e70 | 4190 | struct inferior *inf = find_inferior_ptid (ptid); |
4f5d7f63 PA |
4191 | |
4192 | gdb_assert (inf != NULL); | |
4193 | return inf->control.stop_soon; | |
4194 | } | |
4195 | ||
372316f1 PA |
4196 | /* Wait for one event. Store the resulting waitstatus in WS, and |
4197 | return the event ptid. */ | |
4198 | ||
4199 | static ptid_t | |
4200 | wait_one (struct target_waitstatus *ws) | |
4201 | { | |
4202 | ptid_t event_ptid; | |
4203 | ptid_t wait_ptid = minus_one_ptid; | |
4204 | ||
4205 | overlay_cache_invalid = 1; | |
4206 | ||
4207 | /* Flush target cache before starting to handle each event. | |
4208 | Target was running and cache could be stale. This is just a | |
4209 | heuristic. Running threads may modify target memory, but we | |
4210 | don't get any event. */ | |
4211 | target_dcache_invalidate (); | |
4212 | ||
4213 | if (deprecated_target_wait_hook) | |
4214 | event_ptid = deprecated_target_wait_hook (wait_ptid, ws, 0); | |
4215 | else | |
4216 | event_ptid = target_wait (wait_ptid, ws, 0); | |
4217 | ||
4218 | if (debug_infrun) | |
4219 | print_target_wait_results (wait_ptid, event_ptid, ws); | |
4220 | ||
4221 | return event_ptid; | |
4222 | } | |
4223 | ||
4224 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID | |
4225 | instead of the current thread. */ | |
4226 | #define THREAD_STOPPED_BY(REASON) \ | |
4227 | static int \ | |
4228 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4229 | { \ | |
4230 | struct cleanup *old_chain; \ | |
4231 | int res; \ | |
4232 | \ | |
4233 | old_chain = save_inferior_ptid (); \ | |
4234 | inferior_ptid = ptid; \ | |
4235 | \ | |
4236 | res = target_stopped_by_ ## REASON (); \ | |
4237 | \ | |
4238 | do_cleanups (old_chain); \ | |
4239 | \ | |
4240 | return res; \ | |
4241 | } | |
4242 | ||
4243 | /* Generate thread_stopped_by_watchpoint. */ | |
4244 | THREAD_STOPPED_BY (watchpoint) | |
4245 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4246 | THREAD_STOPPED_BY (sw_breakpoint) | |
4247 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4248 | THREAD_STOPPED_BY (hw_breakpoint) | |
4249 | ||
4250 | /* Cleanups that switches to the PTID pointed at by PTID_P. */ | |
4251 | ||
4252 | static void | |
4253 | switch_to_thread_cleanup (void *ptid_p) | |
4254 | { | |
4255 | ptid_t ptid = *(ptid_t *) ptid_p; | |
4256 | ||
4257 | switch_to_thread (ptid); | |
4258 | } | |
4259 | ||
4260 | /* Save the thread's event and stop reason to process it later. */ | |
4261 | ||
4262 | static void | |
4263 | save_waitstatus (struct thread_info *tp, struct target_waitstatus *ws) | |
4264 | { | |
4265 | struct regcache *regcache; | |
4266 | struct address_space *aspace; | |
4267 | ||
4268 | if (debug_infrun) | |
4269 | { | |
4270 | char *statstr; | |
4271 | ||
4272 | statstr = target_waitstatus_to_string (ws); | |
4273 | fprintf_unfiltered (gdb_stdlog, | |
4274 | "infrun: saving status %s for %d.%ld.%ld\n", | |
4275 | statstr, | |
4276 | ptid_get_pid (tp->ptid), | |
4277 | ptid_get_lwp (tp->ptid), | |
4278 | ptid_get_tid (tp->ptid)); | |
4279 | xfree (statstr); | |
4280 | } | |
4281 | ||
4282 | /* Record for later. */ | |
4283 | tp->suspend.waitstatus = *ws; | |
4284 | tp->suspend.waitstatus_pending_p = 1; | |
4285 | ||
4286 | regcache = get_thread_regcache (tp->ptid); | |
4287 | aspace = get_regcache_aspace (regcache); | |
4288 | ||
4289 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4290 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4291 | { | |
4292 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4293 | ||
4294 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4295 | ||
4296 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4297 | { | |
4298 | tp->suspend.stop_reason | |
4299 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4300 | } | |
4301 | else if (target_supports_stopped_by_sw_breakpoint () | |
4302 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4303 | { | |
4304 | tp->suspend.stop_reason | |
4305 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4306 | } | |
4307 | else if (target_supports_stopped_by_hw_breakpoint () | |
4308 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4309 | { | |
4310 | tp->suspend.stop_reason | |
4311 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4312 | } | |
4313 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4314 | && hardware_breakpoint_inserted_here_p (aspace, | |
4315 | pc)) | |
4316 | { | |
4317 | tp->suspend.stop_reason | |
4318 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4319 | } | |
4320 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4321 | && software_breakpoint_inserted_here_p (aspace, | |
4322 | pc)) | |
4323 | { | |
4324 | tp->suspend.stop_reason | |
4325 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4326 | } | |
4327 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4328 | && currently_stepping (tp)) | |
4329 | { | |
4330 | tp->suspend.stop_reason | |
4331 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4332 | } | |
4333 | } | |
4334 | } | |
4335 | ||
4336 | /* Stop all threads. */ | |
4337 | ||
4338 | static void | |
4339 | stop_all_threads (void) | |
4340 | { | |
4341 | /* We may need multiple passes to discover all threads. */ | |
4342 | int pass; | |
4343 | int iterations = 0; | |
4344 | ptid_t entry_ptid; | |
4345 | struct cleanup *old_chain; | |
4346 | ||
fbea99ea | 4347 | gdb_assert (target_is_non_stop_p ()); |
372316f1 PA |
4348 | |
4349 | if (debug_infrun) | |
4350 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n"); | |
4351 | ||
4352 | entry_ptid = inferior_ptid; | |
4353 | old_chain = make_cleanup (switch_to_thread_cleanup, &entry_ptid); | |
4354 | ||
4355 | /* Request threads to stop, and then wait for the stops. Because | |
4356 | threads we already know about can spawn more threads while we're | |
4357 | trying to stop them, and we only learn about new threads when we | |
4358 | update the thread list, do this in a loop, and keep iterating | |
4359 | until two passes find no threads that need to be stopped. */ | |
4360 | for (pass = 0; pass < 2; pass++, iterations++) | |
4361 | { | |
4362 | if (debug_infrun) | |
4363 | fprintf_unfiltered (gdb_stdlog, | |
4364 | "infrun: stop_all_threads, pass=%d, " | |
4365 | "iterations=%d\n", pass, iterations); | |
4366 | while (1) | |
4367 | { | |
4368 | ptid_t event_ptid; | |
4369 | struct target_waitstatus ws; | |
4370 | int need_wait = 0; | |
4371 | struct thread_info *t; | |
4372 | ||
4373 | update_thread_list (); | |
4374 | ||
4375 | /* Go through all threads looking for threads that we need | |
4376 | to tell the target to stop. */ | |
4377 | ALL_NON_EXITED_THREADS (t) | |
4378 | { | |
4379 | if (t->executing) | |
4380 | { | |
4381 | /* If already stopping, don't request a stop again. | |
4382 | We just haven't seen the notification yet. */ | |
4383 | if (!t->stop_requested) | |
4384 | { | |
4385 | if (debug_infrun) | |
4386 | fprintf_unfiltered (gdb_stdlog, | |
4387 | "infrun: %s executing, " | |
4388 | "need stop\n", | |
4389 | target_pid_to_str (t->ptid)); | |
4390 | target_stop (t->ptid); | |
4391 | t->stop_requested = 1; | |
4392 | } | |
4393 | else | |
4394 | { | |
4395 | if (debug_infrun) | |
4396 | fprintf_unfiltered (gdb_stdlog, | |
4397 | "infrun: %s executing, " | |
4398 | "already stopping\n", | |
4399 | target_pid_to_str (t->ptid)); | |
4400 | } | |
4401 | ||
4402 | if (t->stop_requested) | |
4403 | need_wait = 1; | |
4404 | } | |
4405 | else | |
4406 | { | |
4407 | if (debug_infrun) | |
4408 | fprintf_unfiltered (gdb_stdlog, | |
4409 | "infrun: %s not executing\n", | |
4410 | target_pid_to_str (t->ptid)); | |
4411 | ||
4412 | /* The thread may be not executing, but still be | |
4413 | resumed with a pending status to process. */ | |
4414 | t->resumed = 0; | |
4415 | } | |
4416 | } | |
4417 | ||
4418 | if (!need_wait) | |
4419 | break; | |
4420 | ||
4421 | /* If we find new threads on the second iteration, restart | |
4422 | over. We want to see two iterations in a row with all | |
4423 | threads stopped. */ | |
4424 | if (pass > 0) | |
4425 | pass = -1; | |
4426 | ||
4427 | event_ptid = wait_one (&ws); | |
4428 | if (ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4429 | { | |
4430 | /* All resumed threads exited. */ | |
4431 | } | |
4432 | else if (ws.kind == TARGET_WAITKIND_EXITED | |
4433 | || ws.kind == TARGET_WAITKIND_SIGNALLED) | |
4434 | { | |
4435 | if (debug_infrun) | |
4436 | { | |
4437 | ptid_t ptid = pid_to_ptid (ws.value.integer); | |
4438 | ||
4439 | fprintf_unfiltered (gdb_stdlog, | |
4440 | "infrun: %s exited while " | |
4441 | "stopping threads\n", | |
4442 | target_pid_to_str (ptid)); | |
4443 | } | |
4444 | } | |
4445 | else | |
4446 | { | |
4447 | t = find_thread_ptid (event_ptid); | |
4448 | if (t == NULL) | |
4449 | t = add_thread (event_ptid); | |
4450 | ||
4451 | t->stop_requested = 0; | |
4452 | t->executing = 0; | |
4453 | t->resumed = 0; | |
4454 | t->control.may_range_step = 0; | |
4455 | ||
4456 | if (ws.kind == TARGET_WAITKIND_STOPPED | |
4457 | && ws.value.sig == GDB_SIGNAL_0) | |
4458 | { | |
4459 | /* We caught the event that we intended to catch, so | |
4460 | there's no event pending. */ | |
4461 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4462 | t->suspend.waitstatus_pending_p = 0; | |
4463 | ||
4464 | if (displaced_step_fixup (t->ptid, GDB_SIGNAL_0) < 0) | |
4465 | { | |
4466 | /* Add it back to the step-over queue. */ | |
4467 | if (debug_infrun) | |
4468 | { | |
4469 | fprintf_unfiltered (gdb_stdlog, | |
4470 | "infrun: displaced-step of %s " | |
4471 | "canceled: adding back to the " | |
4472 | "step-over queue\n", | |
4473 | target_pid_to_str (t->ptid)); | |
4474 | } | |
4475 | t->control.trap_expected = 0; | |
4476 | thread_step_over_chain_enqueue (t); | |
4477 | } | |
4478 | } | |
4479 | else | |
4480 | { | |
4481 | enum gdb_signal sig; | |
4482 | struct regcache *regcache; | |
4483 | struct address_space *aspace; | |
4484 | ||
4485 | if (debug_infrun) | |
4486 | { | |
4487 | char *statstr; | |
4488 | ||
4489 | statstr = target_waitstatus_to_string (&ws); | |
4490 | fprintf_unfiltered (gdb_stdlog, | |
4491 | "infrun: target_wait %s, saving " | |
4492 | "status for %d.%ld.%ld\n", | |
4493 | statstr, | |
4494 | ptid_get_pid (t->ptid), | |
4495 | ptid_get_lwp (t->ptid), | |
4496 | ptid_get_tid (t->ptid)); | |
4497 | xfree (statstr); | |
4498 | } | |
4499 | ||
4500 | /* Record for later. */ | |
4501 | save_waitstatus (t, &ws); | |
4502 | ||
4503 | sig = (ws.kind == TARGET_WAITKIND_STOPPED | |
4504 | ? ws.value.sig : GDB_SIGNAL_0); | |
4505 | ||
4506 | if (displaced_step_fixup (t->ptid, sig) < 0) | |
4507 | { | |
4508 | /* Add it back to the step-over queue. */ | |
4509 | t->control.trap_expected = 0; | |
4510 | thread_step_over_chain_enqueue (t); | |
4511 | } | |
4512 | ||
4513 | regcache = get_thread_regcache (t->ptid); | |
4514 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4515 | ||
4516 | if (debug_infrun) | |
4517 | { | |
4518 | fprintf_unfiltered (gdb_stdlog, | |
4519 | "infrun: saved stop_pc=%s for %s " | |
4520 | "(currently_stepping=%d)\n", | |
4521 | paddress (target_gdbarch (), | |
4522 | t->suspend.stop_pc), | |
4523 | target_pid_to_str (t->ptid), | |
4524 | currently_stepping (t)); | |
4525 | } | |
4526 | } | |
4527 | } | |
4528 | } | |
4529 | } | |
4530 | ||
4531 | do_cleanups (old_chain); | |
4532 | ||
4533 | if (debug_infrun) | |
4534 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n"); | |
4535 | } | |
4536 | ||
05ba8510 PA |
4537 | /* Given an execution control state that has been freshly filled in by |
4538 | an event from the inferior, figure out what it means and take | |
4539 | appropriate action. | |
4540 | ||
4541 | The alternatives are: | |
4542 | ||
22bcd14b | 4543 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
4544 | debugger. |
4545 | ||
4546 | 2) keep_going and return; to wait for the next event (set | |
4547 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
4548 | once). */ | |
c906108c | 4549 | |
ec9499be | 4550 | static void |
0b6e5e10 | 4551 | handle_inferior_event_1 (struct execution_control_state *ecs) |
cd0fc7c3 | 4552 | { |
d6b48e9c PA |
4553 | enum stop_kind stop_soon; |
4554 | ||
28736962 PA |
4555 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
4556 | { | |
4557 | /* We had an event in the inferior, but we are not interested in | |
4558 | handling it at this level. The lower layers have already | |
4559 | done what needs to be done, if anything. | |
4560 | ||
4561 | One of the possible circumstances for this is when the | |
4562 | inferior produces output for the console. The inferior has | |
4563 | not stopped, and we are ignoring the event. Another possible | |
4564 | circumstance is any event which the lower level knows will be | |
4565 | reported multiple times without an intervening resume. */ | |
4566 | if (debug_infrun) | |
4567 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
4568 | prepare_to_wait (ecs); | |
4569 | return; | |
4570 | } | |
4571 | ||
0e5bf2a8 PA |
4572 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
4573 | && target_can_async_p () && !sync_execution) | |
4574 | { | |
4575 | /* There were no unwaited-for children left in the target, but, | |
4576 | we're not synchronously waiting for events either. Just | |
4577 | ignore. Otherwise, if we were running a synchronous | |
4578 | execution command, we need to cancel it and give the user | |
4579 | back the terminal. */ | |
4580 | if (debug_infrun) | |
4581 | fprintf_unfiltered (gdb_stdlog, | |
4582 | "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n"); | |
4583 | prepare_to_wait (ecs); | |
4584 | return; | |
4585 | } | |
4586 | ||
1777feb0 | 4587 | /* Cache the last pid/waitstatus. */ |
c32c64b7 | 4588 | set_last_target_status (ecs->ptid, ecs->ws); |
e02bc4cc | 4589 | |
ca005067 | 4590 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 4591 | stop_stack_dummy = STOP_NONE; |
ca005067 | 4592 | |
0e5bf2a8 PA |
4593 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
4594 | { | |
4595 | /* No unwaited-for children left. IOW, all resumed children | |
4596 | have exited. */ | |
4597 | if (debug_infrun) | |
4598 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
4599 | ||
4600 | stop_print_frame = 0; | |
22bcd14b | 4601 | stop_waiting (ecs); |
0e5bf2a8 PA |
4602 | return; |
4603 | } | |
4604 | ||
8c90c137 | 4605 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 4606 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 PA |
4607 | { |
4608 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
4609 | /* If it's a new thread, add it to the thread database. */ | |
4610 | if (ecs->event_thread == NULL) | |
4611 | ecs->event_thread = add_thread (ecs->ptid); | |
c1e36e3e PA |
4612 | |
4613 | /* Disable range stepping. If the next step request could use a | |
4614 | range, this will be end up re-enabled then. */ | |
4615 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 4616 | } |
88ed393a JK |
4617 | |
4618 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 4619 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
4620 | |
4621 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
4622 | reinit_frame_cache (); | |
4623 | ||
28736962 PA |
4624 | breakpoint_retire_moribund (); |
4625 | ||
2b009048 DJ |
4626 | /* First, distinguish signals caused by the debugger from signals |
4627 | that have to do with the program's own actions. Note that | |
4628 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
4629 | on the operating system version. Here we detect when a SIGILL or | |
4630 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
4631 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
4632 | when we're trying to execute a breakpoint instruction on a | |
4633 | non-executable stack. This happens for call dummy breakpoints | |
4634 | for architectures like SPARC that place call dummies on the | |
4635 | stack. */ | |
2b009048 | 4636 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
4637 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
4638 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
4639 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 4640 | { |
de0a0249 UW |
4641 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
4642 | ||
4643 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
4644 | regcache_read_pc (regcache))) | |
4645 | { | |
4646 | if (debug_infrun) | |
4647 | fprintf_unfiltered (gdb_stdlog, | |
4648 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 4649 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 4650 | } |
2b009048 DJ |
4651 | } |
4652 | ||
28736962 PA |
4653 | /* Mark the non-executing threads accordingly. In all-stop, all |
4654 | threads of all processes are stopped when we get any event | |
e1316e60 | 4655 | reported. In non-stop mode, only the event thread stops. */ |
372316f1 PA |
4656 | { |
4657 | ptid_t mark_ptid; | |
4658 | ||
fbea99ea | 4659 | if (!target_is_non_stop_p ()) |
372316f1 PA |
4660 | mark_ptid = minus_one_ptid; |
4661 | else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED | |
4662 | || ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4663 | { | |
4664 | /* If we're handling a process exit in non-stop mode, even | |
4665 | though threads haven't been deleted yet, one would think | |
4666 | that there is nothing to do, as threads of the dead process | |
4667 | will be soon deleted, and threads of any other process were | |
4668 | left running. However, on some targets, threads survive a | |
4669 | process exit event. E.g., for the "checkpoint" command, | |
4670 | when the current checkpoint/fork exits, linux-fork.c | |
4671 | automatically switches to another fork from within | |
4672 | target_mourn_inferior, by associating the same | |
4673 | inferior/thread to another fork. We haven't mourned yet at | |
4674 | this point, but we must mark any threads left in the | |
4675 | process as not-executing so that finish_thread_state marks | |
4676 | them stopped (in the user's perspective) if/when we present | |
4677 | the stop to the user. */ | |
4678 | mark_ptid = pid_to_ptid (ptid_get_pid (ecs->ptid)); | |
4679 | } | |
4680 | else | |
4681 | mark_ptid = ecs->ptid; | |
4682 | ||
4683 | set_executing (mark_ptid, 0); | |
4684 | ||
4685 | /* Likewise the resumed flag. */ | |
4686 | set_resumed (mark_ptid, 0); | |
4687 | } | |
8c90c137 | 4688 | |
488f131b JB |
4689 | switch (ecs->ws.kind) |
4690 | { | |
4691 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 4692 | if (debug_infrun) |
8a9de0e4 | 4693 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
5c09a2c5 PA |
4694 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
4695 | context_switch (ecs->ptid); | |
b0f4b84b DJ |
4696 | /* Ignore gracefully during startup of the inferior, as it might |
4697 | be the shell which has just loaded some objects, otherwise | |
4698 | add the symbols for the newly loaded objects. Also ignore at | |
4699 | the beginning of an attach or remote session; we will query | |
4700 | the full list of libraries once the connection is | |
4701 | established. */ | |
4f5d7f63 PA |
4702 | |
4703 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
c0236d92 | 4704 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 4705 | { |
edcc5120 TT |
4706 | struct regcache *regcache; |
4707 | ||
edcc5120 TT |
4708 | regcache = get_thread_regcache (ecs->ptid); |
4709 | ||
4710 | handle_solib_event (); | |
4711 | ||
4712 | ecs->event_thread->control.stop_bpstat | |
4713 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
4714 | stop_pc, ecs->ptid, &ecs->ws); | |
ab04a2af | 4715 | |
ce12b012 | 4716 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
4717 | { |
4718 | /* A catchpoint triggered. */ | |
94c57d6a PA |
4719 | process_event_stop_test (ecs); |
4720 | return; | |
edcc5120 | 4721 | } |
488f131b | 4722 | |
b0f4b84b DJ |
4723 | /* If requested, stop when the dynamic linker notifies |
4724 | gdb of events. This allows the user to get control | |
4725 | and place breakpoints in initializer routines for | |
4726 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 4727 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
4728 | if (stop_on_solib_events) |
4729 | { | |
55409f9d DJ |
4730 | /* Make sure we print "Stopped due to solib-event" in |
4731 | normal_stop. */ | |
4732 | stop_print_frame = 1; | |
4733 | ||
22bcd14b | 4734 | stop_waiting (ecs); |
b0f4b84b DJ |
4735 | return; |
4736 | } | |
488f131b | 4737 | } |
b0f4b84b DJ |
4738 | |
4739 | /* If we are skipping through a shell, or through shared library | |
4740 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 4741 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
4742 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
4743 | { | |
74960c60 VP |
4744 | /* Loading of shared libraries might have changed breakpoint |
4745 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 4746 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 4747 | insert_breakpoints (); |
64ce06e4 | 4748 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
4749 | prepare_to_wait (ecs); |
4750 | return; | |
4751 | } | |
4752 | ||
5c09a2c5 PA |
4753 | /* But stop if we're attaching or setting up a remote |
4754 | connection. */ | |
4755 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
4756 | || stop_soon == STOP_QUIETLY_REMOTE) | |
4757 | { | |
4758 | if (debug_infrun) | |
4759 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 4760 | stop_waiting (ecs); |
5c09a2c5 PA |
4761 | return; |
4762 | } | |
4763 | ||
4764 | internal_error (__FILE__, __LINE__, | |
4765 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 4766 | |
488f131b | 4767 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 4768 | if (debug_infrun) |
8a9de0e4 | 4769 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
64776a0b | 4770 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
8b3ee56d | 4771 | context_switch (ecs->ptid); |
64ce06e4 | 4772 | resume (GDB_SIGNAL_0); |
488f131b JB |
4773 | prepare_to_wait (ecs); |
4774 | return; | |
c5aa993b | 4775 | |
488f131b | 4776 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 4777 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 4778 | if (debug_infrun) |
940c3c06 PA |
4779 | { |
4780 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4781 | fprintf_unfiltered (gdb_stdlog, | |
4782 | "infrun: TARGET_WAITKIND_EXITED\n"); | |
4783 | else | |
4784 | fprintf_unfiltered (gdb_stdlog, | |
4785 | "infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
4786 | } | |
4787 | ||
fb66883a | 4788 | inferior_ptid = ecs->ptid; |
c9657e70 | 4789 | set_current_inferior (find_inferior_ptid (ecs->ptid)); |
6c95b8df PA |
4790 | set_current_program_space (current_inferior ()->pspace); |
4791 | handle_vfork_child_exec_or_exit (0); | |
1777feb0 | 4792 | target_terminal_ours (); /* Must do this before mourn anyway. */ |
488f131b | 4793 | |
0c557179 SDJ |
4794 | /* Clearing any previous state of convenience variables. */ |
4795 | clear_exit_convenience_vars (); | |
4796 | ||
940c3c06 PA |
4797 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
4798 | { | |
4799 | /* Record the exit code in the convenience variable $_exitcode, so | |
4800 | that the user can inspect this again later. */ | |
4801 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
4802 | (LONGEST) ecs->ws.value.integer); | |
4803 | ||
4804 | /* Also record this in the inferior itself. */ | |
4805 | current_inferior ()->has_exit_code = 1; | |
4806 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 4807 | |
98eb56a4 PA |
4808 | /* Support the --return-child-result option. */ |
4809 | return_child_result_value = ecs->ws.value.integer; | |
4810 | ||
fd664c91 | 4811 | observer_notify_exited (ecs->ws.value.integer); |
940c3c06 PA |
4812 | } |
4813 | else | |
0c557179 SDJ |
4814 | { |
4815 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
4816 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4817 | ||
4818 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
4819 | { | |
4820 | /* Set the value of the internal variable $_exitsignal, | |
4821 | which holds the signal uncaught by the inferior. */ | |
4822 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
4823 | gdbarch_gdb_signal_to_target (gdbarch, | |
4824 | ecs->ws.value.sig)); | |
4825 | } | |
4826 | else | |
4827 | { | |
4828 | /* We don't have access to the target's method used for | |
4829 | converting between signal numbers (GDB's internal | |
4830 | representation <-> target's representation). | |
4831 | Therefore, we cannot do a good job at displaying this | |
4832 | information to the user. It's better to just warn | |
4833 | her about it (if infrun debugging is enabled), and | |
4834 | give up. */ | |
4835 | if (debug_infrun) | |
4836 | fprintf_filtered (gdb_stdlog, _("\ | |
4837 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
4838 | } | |
4839 | ||
fd664c91 | 4840 | observer_notify_signal_exited (ecs->ws.value.sig); |
0c557179 | 4841 | } |
8cf64490 | 4842 | |
488f131b JB |
4843 | gdb_flush (gdb_stdout); |
4844 | target_mourn_inferior (); | |
488f131b | 4845 | stop_print_frame = 0; |
22bcd14b | 4846 | stop_waiting (ecs); |
488f131b | 4847 | return; |
c5aa993b | 4848 | |
488f131b | 4849 | /* The following are the only cases in which we keep going; |
1777feb0 | 4850 | the above cases end in a continue or goto. */ |
488f131b | 4851 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 4852 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 4853 | if (debug_infrun) |
fed708ed PA |
4854 | { |
4855 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
4856 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); | |
4857 | else | |
4858 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n"); | |
4859 | } | |
c906108c | 4860 | |
e2d96639 YQ |
4861 | /* Check whether the inferior is displaced stepping. */ |
4862 | { | |
4863 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
4864 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4865 | struct displaced_step_inferior_state *displaced | |
4866 | = get_displaced_stepping_state (ptid_get_pid (ecs->ptid)); | |
4867 | ||
4868 | /* If checking displaced stepping is supported, and thread | |
4869 | ecs->ptid is displaced stepping. */ | |
4870 | if (displaced && ptid_equal (displaced->step_ptid, ecs->ptid)) | |
4871 | { | |
4872 | struct inferior *parent_inf | |
c9657e70 | 4873 | = find_inferior_ptid (ecs->ptid); |
e2d96639 YQ |
4874 | struct regcache *child_regcache; |
4875 | CORE_ADDR parent_pc; | |
4876 | ||
4877 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
4878 | indicating that the displaced stepping of syscall instruction | |
4879 | has been done. Perform cleanup for parent process here. Note | |
4880 | that this operation also cleans up the child process for vfork, | |
4881 | because their pages are shared. */ | |
a493e3e2 | 4882 | displaced_step_fixup (ecs->ptid, GDB_SIGNAL_TRAP); |
c2829269 PA |
4883 | /* Start a new step-over in another thread if there's one |
4884 | that needs it. */ | |
4885 | start_step_over (); | |
e2d96639 YQ |
4886 | |
4887 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
4888 | { | |
4889 | /* Restore scratch pad for child process. */ | |
4890 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
4891 | } | |
4892 | ||
4893 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
4894 | the child's PC is also within the scratchpad. Set the child's PC | |
4895 | to the parent's PC value, which has already been fixed up. | |
4896 | FIXME: we use the parent's aspace here, although we're touching | |
4897 | the child, because the child hasn't been added to the inferior | |
4898 | list yet at this point. */ | |
4899 | ||
4900 | child_regcache | |
4901 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
4902 | gdbarch, | |
4903 | parent_inf->aspace); | |
4904 | /* Read PC value of parent process. */ | |
4905 | parent_pc = regcache_read_pc (regcache); | |
4906 | ||
4907 | if (debug_displaced) | |
4908 | fprintf_unfiltered (gdb_stdlog, | |
4909 | "displaced: write child pc from %s to %s\n", | |
4910 | paddress (gdbarch, | |
4911 | regcache_read_pc (child_regcache)), | |
4912 | paddress (gdbarch, parent_pc)); | |
4913 | ||
4914 | regcache_write_pc (child_regcache, parent_pc); | |
4915 | } | |
4916 | } | |
4917 | ||
5a2901d9 | 4918 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 4919 | context_switch (ecs->ptid); |
5a2901d9 | 4920 | |
b242c3c2 PA |
4921 | /* Immediately detach breakpoints from the child before there's |
4922 | any chance of letting the user delete breakpoints from the | |
4923 | breakpoint lists. If we don't do this early, it's easy to | |
4924 | leave left over traps in the child, vis: "break foo; catch | |
4925 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
4926 | the fork on the last `continue', and by that time the | |
4927 | breakpoint at "foo" is long gone from the breakpoint table. | |
4928 | If we vforked, then we don't need to unpatch here, since both | |
4929 | parent and child are sharing the same memory pages; we'll | |
4930 | need to unpatch at follow/detach time instead to be certain | |
4931 | that new breakpoints added between catchpoint hit time and | |
4932 | vfork follow are detached. */ | |
4933 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
4934 | { | |
b242c3c2 PA |
4935 | /* This won't actually modify the breakpoint list, but will |
4936 | physically remove the breakpoints from the child. */ | |
d80ee84f | 4937 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
4938 | } |
4939 | ||
34b7e8a6 | 4940 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 4941 | |
e58b0e63 PA |
4942 | /* In case the event is caught by a catchpoint, remember that |
4943 | the event is to be followed at the next resume of the thread, | |
4944 | and not immediately. */ | |
4945 | ecs->event_thread->pending_follow = ecs->ws; | |
4946 | ||
fb14de7b | 4947 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 4948 | |
16c381f0 | 4949 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4950 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 4951 | stop_pc, ecs->ptid, &ecs->ws); |
675bf4cb | 4952 | |
ce12b012 PA |
4953 | /* If no catchpoint triggered for this, then keep going. Note |
4954 | that we're interested in knowing the bpstat actually causes a | |
4955 | stop, not just if it may explain the signal. Software | |
4956 | watchpoints, for example, always appear in the bpstat. */ | |
4957 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 4958 | { |
6c95b8df PA |
4959 | ptid_t parent; |
4960 | ptid_t child; | |
e58b0e63 | 4961 | int should_resume; |
3e43a32a MS |
4962 | int follow_child |
4963 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 4964 | |
a493e3e2 | 4965 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 PA |
4966 | |
4967 | should_resume = follow_fork (); | |
4968 | ||
6c95b8df PA |
4969 | parent = ecs->ptid; |
4970 | child = ecs->ws.value.related_pid; | |
4971 | ||
4972 | /* In non-stop mode, also resume the other branch. */ | |
fbea99ea PA |
4973 | if (!detach_fork && (non_stop |
4974 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
4975 | { |
4976 | if (follow_child) | |
4977 | switch_to_thread (parent); | |
4978 | else | |
4979 | switch_to_thread (child); | |
4980 | ||
4981 | ecs->event_thread = inferior_thread (); | |
4982 | ecs->ptid = inferior_ptid; | |
4983 | keep_going (ecs); | |
4984 | } | |
4985 | ||
4986 | if (follow_child) | |
4987 | switch_to_thread (child); | |
4988 | else | |
4989 | switch_to_thread (parent); | |
4990 | ||
e58b0e63 PA |
4991 | ecs->event_thread = inferior_thread (); |
4992 | ecs->ptid = inferior_ptid; | |
4993 | ||
4994 | if (should_resume) | |
4995 | keep_going (ecs); | |
4996 | else | |
22bcd14b | 4997 | stop_waiting (ecs); |
04e68871 DJ |
4998 | return; |
4999 | } | |
94c57d6a PA |
5000 | process_event_stop_test (ecs); |
5001 | return; | |
488f131b | 5002 | |
6c95b8df PA |
5003 | case TARGET_WAITKIND_VFORK_DONE: |
5004 | /* Done with the shared memory region. Re-insert breakpoints in | |
5005 | the parent, and keep going. */ | |
5006 | ||
5007 | if (debug_infrun) | |
3e43a32a MS |
5008 | fprintf_unfiltered (gdb_stdlog, |
5009 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
6c95b8df PA |
5010 | |
5011 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5012 | context_switch (ecs->ptid); | |
5013 | ||
5014 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5015 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
6c95b8df PA |
5016 | /* This also takes care of reinserting breakpoints in the |
5017 | previously locked inferior. */ | |
5018 | keep_going (ecs); | |
5019 | return; | |
5020 | ||
488f131b | 5021 | case TARGET_WAITKIND_EXECD: |
527159b7 | 5022 | if (debug_infrun) |
fc5261f2 | 5023 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 5024 | |
5a2901d9 | 5025 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 5026 | context_switch (ecs->ptid); |
5a2901d9 | 5027 | |
fb14de7b | 5028 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
795e548f | 5029 | |
6c95b8df PA |
5030 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5031 | handle_vfork_child_exec_or_exit (1); | |
5032 | ||
795e548f PA |
5033 | /* This causes the eventpoints and symbol table to be reset. |
5034 | Must do this now, before trying to determine whether to | |
5035 | stop. */ | |
71b43ef8 | 5036 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5037 | |
17d8546e DB |
5038 | /* In follow_exec we may have deleted the original thread and |
5039 | created a new one. Make sure that the event thread is the | |
5040 | execd thread for that case (this is a nop otherwise). */ | |
5041 | ecs->event_thread = inferior_thread (); | |
5042 | ||
16c381f0 | 5043 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 5044 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 5045 | stop_pc, ecs->ptid, &ecs->ws); |
795e548f | 5046 | |
71b43ef8 PA |
5047 | /* Note that this may be referenced from inside |
5048 | bpstat_stop_status above, through inferior_has_execd. */ | |
5049 | xfree (ecs->ws.value.execd_pathname); | |
5050 | ecs->ws.value.execd_pathname = NULL; | |
5051 | ||
04e68871 | 5052 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5053 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5054 | { |
a493e3e2 | 5055 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5056 | keep_going (ecs); |
5057 | return; | |
5058 | } | |
94c57d6a PA |
5059 | process_event_stop_test (ecs); |
5060 | return; | |
488f131b | 5061 | |
b4dc5ffa MK |
5062 | /* Be careful not to try to gather much state about a thread |
5063 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5064 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 5065 | if (debug_infrun) |
3e43a32a MS |
5066 | fprintf_unfiltered (gdb_stdlog, |
5067 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
1777feb0 | 5068 | /* Getting the current syscall number. */ |
94c57d6a PA |
5069 | if (handle_syscall_event (ecs) == 0) |
5070 | process_event_stop_test (ecs); | |
5071 | return; | |
c906108c | 5072 | |
488f131b JB |
5073 | /* Before examining the threads further, step this thread to |
5074 | get it entirely out of the syscall. (We get notice of the | |
5075 | event when the thread is just on the verge of exiting a | |
5076 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5077 | into user code.) */ |
488f131b | 5078 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 5079 | if (debug_infrun) |
3e43a32a MS |
5080 | fprintf_unfiltered (gdb_stdlog, |
5081 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
94c57d6a PA |
5082 | if (handle_syscall_event (ecs) == 0) |
5083 | process_event_stop_test (ecs); | |
5084 | return; | |
c906108c | 5085 | |
488f131b | 5086 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 5087 | if (debug_infrun) |
8a9de0e4 | 5088 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
16c381f0 | 5089 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
4f5d7f63 PA |
5090 | handle_signal_stop (ecs); |
5091 | return; | |
c906108c | 5092 | |
b2175913 | 5093 | case TARGET_WAITKIND_NO_HISTORY: |
4b4e080e PA |
5094 | if (debug_infrun) |
5095 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
b2175913 | 5096 | /* Reverse execution: target ran out of history info. */ |
eab402df | 5097 | |
34b7e8a6 | 5098 | delete_just_stopped_threads_single_step_breakpoints (); |
fb14de7b | 5099 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
fd664c91 | 5100 | observer_notify_no_history (); |
22bcd14b | 5101 | stop_waiting (ecs); |
b2175913 | 5102 | return; |
488f131b | 5103 | } |
4f5d7f63 PA |
5104 | } |
5105 | ||
0b6e5e10 JB |
5106 | /* A wrapper around handle_inferior_event_1, which also makes sure |
5107 | that all temporary struct value objects that were created during | |
5108 | the handling of the event get deleted at the end. */ | |
5109 | ||
5110 | static void | |
5111 | handle_inferior_event (struct execution_control_state *ecs) | |
5112 | { | |
5113 | struct value *mark = value_mark (); | |
5114 | ||
5115 | handle_inferior_event_1 (ecs); | |
5116 | /* Purge all temporary values created during the event handling, | |
5117 | as it could be a long time before we return to the command level | |
5118 | where such values would otherwise be purged. */ | |
5119 | value_free_to_mark (mark); | |
5120 | } | |
5121 | ||
372316f1 PA |
5122 | /* Restart threads back to what they were trying to do back when we |
5123 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5124 | ignored. */ | |
4d9d9d04 PA |
5125 | |
5126 | static void | |
372316f1 PA |
5127 | restart_threads (struct thread_info *event_thread) |
5128 | { | |
5129 | struct thread_info *tp; | |
5130 | struct thread_info *step_over = NULL; | |
5131 | ||
5132 | /* In case the instruction just stepped spawned a new thread. */ | |
5133 | update_thread_list (); | |
5134 | ||
5135 | ALL_NON_EXITED_THREADS (tp) | |
5136 | { | |
5137 | if (tp == event_thread) | |
5138 | { | |
5139 | if (debug_infrun) | |
5140 | fprintf_unfiltered (gdb_stdlog, | |
5141 | "infrun: restart threads: " | |
5142 | "[%s] is event thread\n", | |
5143 | target_pid_to_str (tp->ptid)); | |
5144 | continue; | |
5145 | } | |
5146 | ||
5147 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5148 | { | |
5149 | if (debug_infrun) | |
5150 | fprintf_unfiltered (gdb_stdlog, | |
5151 | "infrun: restart threads: " | |
5152 | "[%s] not meant to be running\n", | |
5153 | target_pid_to_str (tp->ptid)); | |
5154 | continue; | |
5155 | } | |
5156 | ||
5157 | if (tp->resumed) | |
5158 | { | |
5159 | if (debug_infrun) | |
5160 | fprintf_unfiltered (gdb_stdlog, | |
5161 | "infrun: restart threads: [%s] resumed\n", | |
5162 | target_pid_to_str (tp->ptid)); | |
5163 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
5164 | continue; | |
5165 | } | |
5166 | ||
5167 | if (thread_is_in_step_over_chain (tp)) | |
5168 | { | |
5169 | if (debug_infrun) | |
5170 | fprintf_unfiltered (gdb_stdlog, | |
5171 | "infrun: restart threads: " | |
5172 | "[%s] needs step-over\n", | |
5173 | target_pid_to_str (tp->ptid)); | |
5174 | gdb_assert (!tp->resumed); | |
5175 | continue; | |
5176 | } | |
5177 | ||
5178 | ||
5179 | if (tp->suspend.waitstatus_pending_p) | |
5180 | { | |
5181 | if (debug_infrun) | |
5182 | fprintf_unfiltered (gdb_stdlog, | |
5183 | "infrun: restart threads: " | |
5184 | "[%s] has pending status\n", | |
5185 | target_pid_to_str (tp->ptid)); | |
5186 | tp->resumed = 1; | |
5187 | continue; | |
5188 | } | |
5189 | ||
5190 | /* If some thread needs to start a step-over at this point, it | |
5191 | should still be in the step-over queue, and thus skipped | |
5192 | above. */ | |
5193 | if (thread_still_needs_step_over (tp)) | |
5194 | { | |
5195 | internal_error (__FILE__, __LINE__, | |
5196 | "thread [%s] needs a step-over, but not in " | |
5197 | "step-over queue\n", | |
5198 | target_pid_to_str (tp->ptid)); | |
5199 | } | |
5200 | ||
5201 | if (currently_stepping (tp)) | |
5202 | { | |
5203 | if (debug_infrun) | |
5204 | fprintf_unfiltered (gdb_stdlog, | |
5205 | "infrun: restart threads: [%s] was stepping\n", | |
5206 | target_pid_to_str (tp->ptid)); | |
5207 | keep_going_stepped_thread (tp); | |
5208 | } | |
5209 | else | |
5210 | { | |
5211 | struct execution_control_state ecss; | |
5212 | struct execution_control_state *ecs = &ecss; | |
5213 | ||
5214 | if (debug_infrun) | |
5215 | fprintf_unfiltered (gdb_stdlog, | |
5216 | "infrun: restart threads: [%s] continuing\n", | |
5217 | target_pid_to_str (tp->ptid)); | |
5218 | reset_ecs (ecs, tp); | |
5219 | switch_to_thread (tp->ptid); | |
5220 | keep_going_pass_signal (ecs); | |
5221 | } | |
5222 | } | |
5223 | } | |
5224 | ||
5225 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5226 | a pending waitstatus. */ | |
5227 | ||
5228 | static int | |
5229 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5230 | void *arg) | |
5231 | { | |
5232 | return (tp->resumed | |
5233 | && tp->suspend.waitstatus_pending_p); | |
5234 | } | |
5235 | ||
5236 | /* Called when we get an event that may finish an in-line or | |
5237 | out-of-line (displaced stepping) step-over started previously. | |
5238 | Return true if the event is processed and we should go back to the | |
5239 | event loop; false if the caller should continue processing the | |
5240 | event. */ | |
5241 | ||
5242 | static int | |
4d9d9d04 PA |
5243 | finish_step_over (struct execution_control_state *ecs) |
5244 | { | |
372316f1 PA |
5245 | int had_step_over_info; |
5246 | ||
4d9d9d04 PA |
5247 | displaced_step_fixup (ecs->ptid, |
5248 | ecs->event_thread->suspend.stop_signal); | |
5249 | ||
372316f1 PA |
5250 | had_step_over_info = step_over_info_valid_p (); |
5251 | ||
5252 | if (had_step_over_info) | |
4d9d9d04 PA |
5253 | { |
5254 | /* If we're stepping over a breakpoint with all threads locked, | |
5255 | then only the thread that was stepped should be reporting | |
5256 | back an event. */ | |
5257 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5258 | ||
5259 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5260 | clear_step_over_info (); | |
5261 | } | |
5262 | ||
fbea99ea | 5263 | if (!target_is_non_stop_p ()) |
372316f1 | 5264 | return 0; |
4d9d9d04 PA |
5265 | |
5266 | /* Start a new step-over in another thread if there's one that | |
5267 | needs it. */ | |
5268 | start_step_over (); | |
372316f1 PA |
5269 | |
5270 | /* If we were stepping over a breakpoint before, and haven't started | |
5271 | a new in-line step-over sequence, then restart all other threads | |
5272 | (except the event thread). We can't do this in all-stop, as then | |
5273 | e.g., we wouldn't be able to issue any other remote packet until | |
5274 | these other threads stop. */ | |
5275 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5276 | { | |
5277 | struct thread_info *pending; | |
5278 | ||
5279 | /* If we only have threads with pending statuses, the restart | |
5280 | below won't restart any thread and so nothing re-inserts the | |
5281 | breakpoint we just stepped over. But we need it inserted | |
5282 | when we later process the pending events, otherwise if | |
5283 | another thread has a pending event for this breakpoint too, | |
5284 | we'd discard its event (because the breakpoint that | |
5285 | originally caused the event was no longer inserted). */ | |
5286 | context_switch (ecs->ptid); | |
5287 | insert_breakpoints (); | |
5288 | ||
5289 | restart_threads (ecs->event_thread); | |
5290 | ||
5291 | /* If we have events pending, go through handle_inferior_event | |
5292 | again, picking up a pending event at random. This avoids | |
5293 | thread starvation. */ | |
5294 | ||
5295 | /* But not if we just stepped over a watchpoint in order to let | |
5296 | the instruction execute so we can evaluate its expression. | |
5297 | The set of watchpoints that triggered is recorded in the | |
5298 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5299 | If we processed another event first, that other event could | |
5300 | clobber this info. */ | |
5301 | if (ecs->event_thread->stepping_over_watchpoint) | |
5302 | return 0; | |
5303 | ||
5304 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5305 | NULL); | |
5306 | if (pending != NULL) | |
5307 | { | |
5308 | struct thread_info *tp = ecs->event_thread; | |
5309 | struct regcache *regcache; | |
5310 | ||
5311 | if (debug_infrun) | |
5312 | { | |
5313 | fprintf_unfiltered (gdb_stdlog, | |
5314 | "infrun: found resumed threads with " | |
5315 | "pending events, saving status\n"); | |
5316 | } | |
5317 | ||
5318 | gdb_assert (pending != tp); | |
5319 | ||
5320 | /* Record the event thread's event for later. */ | |
5321 | save_waitstatus (tp, &ecs->ws); | |
5322 | /* This was cleared early, by handle_inferior_event. Set it | |
5323 | so this pending event is considered by | |
5324 | do_target_wait. */ | |
5325 | tp->resumed = 1; | |
5326 | ||
5327 | gdb_assert (!tp->executing); | |
5328 | ||
5329 | regcache = get_thread_regcache (tp->ptid); | |
5330 | tp->suspend.stop_pc = regcache_read_pc (regcache); | |
5331 | ||
5332 | if (debug_infrun) | |
5333 | { | |
5334 | fprintf_unfiltered (gdb_stdlog, | |
5335 | "infrun: saved stop_pc=%s for %s " | |
5336 | "(currently_stepping=%d)\n", | |
5337 | paddress (target_gdbarch (), | |
5338 | tp->suspend.stop_pc), | |
5339 | target_pid_to_str (tp->ptid), | |
5340 | currently_stepping (tp)); | |
5341 | } | |
5342 | ||
5343 | /* This in-line step-over finished; clear this so we won't | |
5344 | start a new one. This is what handle_signal_stop would | |
5345 | do, if we returned false. */ | |
5346 | tp->stepping_over_breakpoint = 0; | |
5347 | ||
5348 | /* Wake up the event loop again. */ | |
5349 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5350 | ||
5351 | prepare_to_wait (ecs); | |
5352 | return 1; | |
5353 | } | |
5354 | } | |
5355 | ||
5356 | return 0; | |
4d9d9d04 PA |
5357 | } |
5358 | ||
4f5d7f63 PA |
5359 | /* Come here when the program has stopped with a signal. */ |
5360 | ||
5361 | static void | |
5362 | handle_signal_stop (struct execution_control_state *ecs) | |
5363 | { | |
5364 | struct frame_info *frame; | |
5365 | struct gdbarch *gdbarch; | |
5366 | int stopped_by_watchpoint; | |
5367 | enum stop_kind stop_soon; | |
5368 | int random_signal; | |
c906108c | 5369 | |
f0407826 DE |
5370 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5371 | ||
5372 | /* Do we need to clean up the state of a thread that has | |
5373 | completed a displaced single-step? (Doing so usually affects | |
5374 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5375 | if (finish_step_over (ecs)) |
5376 | return; | |
f0407826 DE |
5377 | |
5378 | /* If we either finished a single-step or hit a breakpoint, but | |
5379 | the user wanted this thread to be stopped, pretend we got a | |
5380 | SIG0 (generic unsignaled stop). */ | |
5381 | if (ecs->event_thread->stop_requested | |
5382 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5383 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5384 | |
515630c5 | 5385 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 5386 | |
527159b7 | 5387 | if (debug_infrun) |
237fc4c9 | 5388 | { |
5af949e3 UW |
5389 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
5390 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7f82dfc7 JK |
5391 | struct cleanup *old_chain = save_inferior_ptid (); |
5392 | ||
5393 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
5394 | |
5395 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
5396 | paddress (gdbarch, stop_pc)); | |
d92524f1 | 5397 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5398 | { |
5399 | CORE_ADDR addr; | |
abbb1732 | 5400 | |
237fc4c9 PA |
5401 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
5402 | ||
5403 | if (target_stopped_data_address (¤t_target, &addr)) | |
5404 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5405 | "infrun: stopped data address = %s\n", |
5406 | paddress (gdbarch, addr)); | |
237fc4c9 PA |
5407 | else |
5408 | fprintf_unfiltered (gdb_stdlog, | |
5409 | "infrun: (no data address available)\n"); | |
5410 | } | |
7f82dfc7 JK |
5411 | |
5412 | do_cleanups (old_chain); | |
237fc4c9 | 5413 | } |
527159b7 | 5414 | |
36fa8042 PA |
5415 | /* This is originated from start_remote(), start_inferior() and |
5416 | shared libraries hook functions. */ | |
5417 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
5418 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) | |
5419 | { | |
5420 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5421 | context_switch (ecs->ptid); | |
5422 | if (debug_infrun) | |
5423 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
5424 | stop_print_frame = 1; | |
22bcd14b | 5425 | stop_waiting (ecs); |
36fa8042 PA |
5426 | return; |
5427 | } | |
5428 | ||
5429 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5430 | && stop_after_trap) | |
5431 | { | |
5432 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5433 | context_switch (ecs->ptid); | |
5434 | if (debug_infrun) | |
5435 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
5436 | stop_print_frame = 0; | |
22bcd14b | 5437 | stop_waiting (ecs); |
36fa8042 PA |
5438 | return; |
5439 | } | |
5440 | ||
5441 | /* This originates from attach_command(). We need to overwrite | |
5442 | the stop_signal here, because some kernels don't ignore a | |
5443 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5444 | See more comments in inferior.h. On the other hand, if we | |
5445 | get a non-SIGSTOP, report it to the user - assume the backend | |
5446 | will handle the SIGSTOP if it should show up later. | |
5447 | ||
5448 | Also consider that the attach is complete when we see a | |
5449 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5450 | target extended-remote report it instead of a SIGSTOP | |
5451 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5452 | signal, so this is no exception. | |
5453 | ||
5454 | Also consider that the attach is complete when we see a | |
5455 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5456 | the target to stop all threads of the inferior, in case the | |
5457 | low level attach operation doesn't stop them implicitly. If | |
5458 | they weren't stopped implicitly, then the stub will report a | |
5459 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5460 | other than GDB's request. */ | |
5461 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5462 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5463 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5464 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5465 | { | |
5466 | stop_print_frame = 1; | |
22bcd14b | 5467 | stop_waiting (ecs); |
36fa8042 PA |
5468 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5469 | return; | |
5470 | } | |
5471 | ||
488f131b | 5472 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
5473 | so, then switch to that thread. */ |
5474 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 5475 | { |
527159b7 | 5476 | if (debug_infrun) |
8a9de0e4 | 5477 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 5478 | |
0d1e5fa7 | 5479 | context_switch (ecs->ptid); |
c5aa993b | 5480 | |
9a4105ab AC |
5481 | if (deprecated_context_hook) |
5482 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 5483 | } |
c906108c | 5484 | |
568d6575 UW |
5485 | /* At this point, get hold of the now-current thread's frame. */ |
5486 | frame = get_current_frame (); | |
5487 | gdbarch = get_frame_arch (frame); | |
5488 | ||
2adfaa28 | 5489 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5490 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5491 | { |
af48d08f PA |
5492 | struct regcache *regcache; |
5493 | struct address_space *aspace; | |
5494 | CORE_ADDR pc; | |
2adfaa28 | 5495 | |
af48d08f PA |
5496 | regcache = get_thread_regcache (ecs->ptid); |
5497 | aspace = get_regcache_aspace (regcache); | |
5498 | pc = regcache_read_pc (regcache); | |
34b7e8a6 | 5499 | |
af48d08f PA |
5500 | /* However, before doing so, if this single-step breakpoint was |
5501 | actually for another thread, set this thread up for moving | |
5502 | past it. */ | |
5503 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5504 | aspace, pc)) | |
5505 | { | |
5506 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
5507 | { |
5508 | if (debug_infrun) | |
5509 | { | |
5510 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 5511 | "infrun: [%s] hit another thread's " |
34b7e8a6 PA |
5512 | "single-step breakpoint\n", |
5513 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 | 5514 | } |
af48d08f PA |
5515 | ecs->hit_singlestep_breakpoint = 1; |
5516 | } | |
5517 | } | |
5518 | else | |
5519 | { | |
5520 | if (debug_infrun) | |
5521 | { | |
5522 | fprintf_unfiltered (gdb_stdlog, | |
5523 | "infrun: [%s] hit its " | |
5524 | "single-step breakpoint\n", | |
5525 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 PA |
5526 | } |
5527 | } | |
488f131b | 5528 | } |
af48d08f | 5529 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5530 | |
963f9c80 PA |
5531 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5532 | && ecs->event_thread->control.trap_expected | |
5533 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5534 | stopped_by_watchpoint = 0; |
5535 | else | |
5536 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5537 | ||
5538 | /* If necessary, step over this watchpoint. We'll be back to display | |
5539 | it in a moment. */ | |
5540 | if (stopped_by_watchpoint | |
d92524f1 | 5541 | && (target_have_steppable_watchpoint |
568d6575 | 5542 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5543 | { |
488f131b JB |
5544 | /* At this point, we are stopped at an instruction which has |
5545 | attempted to write to a piece of memory under control of | |
5546 | a watchpoint. The instruction hasn't actually executed | |
5547 | yet. If we were to evaluate the watchpoint expression | |
5548 | now, we would get the old value, and therefore no change | |
5549 | would seem to have occurred. | |
5550 | ||
5551 | In order to make watchpoints work `right', we really need | |
5552 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5553 | watchpoint expression. We do this by single-stepping the |
5554 | target. | |
5555 | ||
7f89fd65 | 5556 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5557 | it. For example, the PA can (with some kernel cooperation) |
5558 | single step over a watchpoint without disabling the watchpoint. | |
5559 | ||
5560 | It is far more common to need to disable a watchpoint to step | |
5561 | the inferior over it. If we have non-steppable watchpoints, | |
5562 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5563 | disable all watchpoints. |
5564 | ||
5565 | Any breakpoint at PC must also be stepped over -- if there's | |
5566 | one, it will have already triggered before the watchpoint | |
5567 | triggered, and we either already reported it to the user, or | |
5568 | it didn't cause a stop and we called keep_going. In either | |
5569 | case, if there was a breakpoint at PC, we must be trying to | |
5570 | step past it. */ | |
5571 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5572 | keep_going (ecs); | |
488f131b JB |
5573 | return; |
5574 | } | |
5575 | ||
4e1c45ea | 5576 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5577 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5578 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5579 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5580 | stop_print_frame = 1; |
488f131b | 5581 | stopped_by_random_signal = 0; |
488f131b | 5582 | |
edb3359d DJ |
5583 | /* Hide inlined functions starting here, unless we just performed stepi or |
5584 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5585 | inline function call sites). */ | |
16c381f0 | 5586 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f GB |
5587 | { |
5588 | struct address_space *aspace = | |
5589 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
5590 | ||
5591 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5592 | determine that the address is one where functions cannot have | |
5593 | been inlined. This improves performance with inferiors that | |
5594 | load a lot of shared libraries, because the solib event | |
5595 | breakpoint is defined as the address of a function (i.e. not | |
5596 | inline). Note that we have to check the previous PC as well | |
5597 | as the current one to catch cases when we have just | |
5598 | single-stepped off a breakpoint prior to reinstating it. | |
5599 | Note that we're assuming that the code we single-step to is | |
5600 | not inline, but that's not definitive: there's nothing | |
5601 | preventing the event breakpoint function from containing | |
5602 | inlined code, and the single-step ending up there. If the | |
5603 | user had set a breakpoint on that inlined code, the missing | |
5604 | skip_inline_frames call would break things. Fortunately | |
5605 | that's an extremely unlikely scenario. */ | |
09ac7c10 | 5606 | if (!pc_at_non_inline_function (aspace, stop_pc, &ecs->ws) |
a210c238 MR |
5607 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5608 | && ecs->event_thread->control.trap_expected | |
5609 | && pc_at_non_inline_function (aspace, | |
5610 | ecs->event_thread->prev_pc, | |
09ac7c10 | 5611 | &ecs->ws))) |
1c5a993e MR |
5612 | { |
5613 | skip_inline_frames (ecs->ptid); | |
5614 | ||
5615 | /* Re-fetch current thread's frame in case that invalidated | |
5616 | the frame cache. */ | |
5617 | frame = get_current_frame (); | |
5618 | gdbarch = get_frame_arch (frame); | |
5619 | } | |
0574c78f | 5620 | } |
edb3359d | 5621 | |
a493e3e2 | 5622 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 5623 | && ecs->event_thread->control.trap_expected |
568d6575 | 5624 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 5625 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 5626 | { |
b50d7442 | 5627 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 5628 | also on an instruction that needs to be stepped multiple |
1777feb0 | 5629 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
5630 | with a delay slot. It needs to be stepped twice, once for |
5631 | the instruction and once for the delay slot. */ | |
5632 | int step_through_delay | |
568d6575 | 5633 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 5634 | |
527159b7 | 5635 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 5636 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
5637 | if (ecs->event_thread->control.step_range_end == 0 |
5638 | && step_through_delay) | |
3352ef37 AC |
5639 | { |
5640 | /* The user issued a continue when stopped at a breakpoint. | |
5641 | Set up for another trap and get out of here. */ | |
4e1c45ea | 5642 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5643 | keep_going (ecs); |
5644 | return; | |
5645 | } | |
5646 | else if (step_through_delay) | |
5647 | { | |
5648 | /* The user issued a step when stopped at a breakpoint. | |
5649 | Maybe we should stop, maybe we should not - the delay | |
5650 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
5651 | case, don't decide that here, just set |
5652 | ecs->stepping_over_breakpoint, making sure we | |
5653 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 5654 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5655 | } |
5656 | } | |
5657 | ||
ab04a2af TT |
5658 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
5659 | handles this event. */ | |
5660 | ecs->event_thread->control.stop_bpstat | |
5661 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
5662 | stop_pc, ecs->ptid, &ecs->ws); | |
db82e815 | 5663 | |
ab04a2af TT |
5664 | /* Following in case break condition called a |
5665 | function. */ | |
5666 | stop_print_frame = 1; | |
73dd234f | 5667 | |
ab04a2af TT |
5668 | /* This is where we handle "moribund" watchpoints. Unlike |
5669 | software breakpoints traps, hardware watchpoint traps are | |
5670 | always distinguishable from random traps. If no high-level | |
5671 | watchpoint is associated with the reported stop data address | |
5672 | anymore, then the bpstat does not explain the signal --- | |
5673 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
5674 | set. */ | |
5675 | ||
5676 | if (debug_infrun | |
5677 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 5678 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 5679 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
5680 | && stopped_by_watchpoint) |
5681 | fprintf_unfiltered (gdb_stdlog, | |
5682 | "infrun: no user watchpoint explains " | |
5683 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 5684 | |
bac7d97b | 5685 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
5686 | at one stage in the past included checks for an inferior |
5687 | function call's call dummy's return breakpoint. The original | |
5688 | comment, that went with the test, read: | |
03cebad2 | 5689 | |
ab04a2af TT |
5690 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
5691 | another signal besides SIGTRAP, so check here as well as | |
5692 | above.'' | |
73dd234f | 5693 | |
ab04a2af TT |
5694 | If someone ever tries to get call dummys on a |
5695 | non-executable stack to work (where the target would stop | |
5696 | with something like a SIGSEGV), then those tests might need | |
5697 | to be re-instated. Given, however, that the tests were only | |
5698 | enabled when momentary breakpoints were not being used, I | |
5699 | suspect that it won't be the case. | |
488f131b | 5700 | |
ab04a2af TT |
5701 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
5702 | be necessary for call dummies on a non-executable stack on | |
5703 | SPARC. */ | |
488f131b | 5704 | |
bac7d97b | 5705 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
5706 | random_signal |
5707 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
5708 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 5709 | |
1cf4d951 PA |
5710 | /* Maybe this was a trap for a software breakpoint that has since |
5711 | been removed. */ | |
5712 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
5713 | { | |
5714 | if (program_breakpoint_here_p (gdbarch, stop_pc)) | |
5715 | { | |
5716 | struct regcache *regcache; | |
5717 | int decr_pc; | |
5718 | ||
5719 | /* Re-adjust PC to what the program would see if GDB was not | |
5720 | debugging it. */ | |
5721 | regcache = get_thread_regcache (ecs->event_thread->ptid); | |
527a273a | 5722 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
5723 | if (decr_pc != 0) |
5724 | { | |
5725 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); | |
5726 | ||
5727 | if (record_full_is_used ()) | |
5728 | record_full_gdb_operation_disable_set (); | |
5729 | ||
5730 | regcache_write_pc (regcache, stop_pc + decr_pc); | |
5731 | ||
5732 | do_cleanups (old_cleanups); | |
5733 | } | |
5734 | } | |
5735 | else | |
5736 | { | |
5737 | /* A delayed software breakpoint event. Ignore the trap. */ | |
5738 | if (debug_infrun) | |
5739 | fprintf_unfiltered (gdb_stdlog, | |
5740 | "infrun: delayed software breakpoint " | |
5741 | "trap, ignoring\n"); | |
5742 | random_signal = 0; | |
5743 | } | |
5744 | } | |
5745 | ||
5746 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
5747 | has since been removed. */ | |
5748 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
5749 | { | |
5750 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
5751 | if (debug_infrun) | |
5752 | fprintf_unfiltered (gdb_stdlog, | |
5753 | "infrun: delayed hardware breakpoint/watchpoint " | |
5754 | "trap, ignoring\n"); | |
5755 | random_signal = 0; | |
5756 | } | |
5757 | ||
bac7d97b PA |
5758 | /* If not, perhaps stepping/nexting can. */ |
5759 | if (random_signal) | |
5760 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5761 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 5762 | |
2adfaa28 PA |
5763 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
5764 | thread. Single-step breakpoints are transparent to the | |
5765 | breakpoints module. */ | |
5766 | if (random_signal) | |
5767 | random_signal = !ecs->hit_singlestep_breakpoint; | |
5768 | ||
bac7d97b PA |
5769 | /* No? Perhaps we got a moribund watchpoint. */ |
5770 | if (random_signal) | |
5771 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 5772 | |
488f131b JB |
5773 | /* For the program's own signals, act according to |
5774 | the signal handling tables. */ | |
5775 | ||
ce12b012 | 5776 | if (random_signal) |
488f131b JB |
5777 | { |
5778 | /* Signal not for debugging purposes. */ | |
c9657e70 | 5779 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
c9737c08 | 5780 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 5781 | |
527159b7 | 5782 | if (debug_infrun) |
c9737c08 PA |
5783 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
5784 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 5785 | |
488f131b JB |
5786 | stopped_by_random_signal = 1; |
5787 | ||
252fbfc8 PA |
5788 | /* Always stop on signals if we're either just gaining control |
5789 | of the program, or the user explicitly requested this thread | |
5790 | to remain stopped. */ | |
d6b48e9c | 5791 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 5792 | || ecs->event_thread->stop_requested |
24291992 | 5793 | || (!inf->detaching |
16c381f0 | 5794 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 5795 | { |
22bcd14b | 5796 | stop_waiting (ecs); |
488f131b JB |
5797 | return; |
5798 | } | |
b57bacec PA |
5799 | |
5800 | /* Notify observers the signal has "handle print" set. Note we | |
5801 | returned early above if stopping; normal_stop handles the | |
5802 | printing in that case. */ | |
5803 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
5804 | { | |
5805 | /* The signal table tells us to print about this signal. */ | |
5806 | target_terminal_ours_for_output (); | |
5807 | observer_notify_signal_received (ecs->event_thread->suspend.stop_signal); | |
5808 | target_terminal_inferior (); | |
5809 | } | |
488f131b JB |
5810 | |
5811 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 5812 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 5813 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 5814 | |
fb14de7b | 5815 | if (ecs->event_thread->prev_pc == stop_pc |
16c381f0 | 5816 | && ecs->event_thread->control.trap_expected |
8358c15c | 5817 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 | 5818 | { |
372316f1 PA |
5819 | int was_in_line; |
5820 | ||
68f53502 AC |
5821 | /* We were just starting a new sequence, attempting to |
5822 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 5823 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
5824 | of the stepping range so GDB needs to remember to, when |
5825 | the signal handler returns, resume stepping off that | |
5826 | breakpoint. */ | |
5827 | /* To simplify things, "continue" is forced to use the same | |
5828 | code paths as single-step - set a breakpoint at the | |
5829 | signal return address and then, once hit, step off that | |
5830 | breakpoint. */ | |
237fc4c9 PA |
5831 | if (debug_infrun) |
5832 | fprintf_unfiltered (gdb_stdlog, | |
5833 | "infrun: signal arrived while stepping over " | |
5834 | "breakpoint\n"); | |
d3169d93 | 5835 | |
372316f1 PA |
5836 | was_in_line = step_over_info_valid_p (); |
5837 | clear_step_over_info (); | |
2c03e5be | 5838 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 5839 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
5840 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
5841 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc | 5842 | |
fbea99ea | 5843 | if (target_is_non_stop_p ()) |
372316f1 | 5844 | { |
fbea99ea PA |
5845 | /* Either "set non-stop" is "on", or the target is |
5846 | always in non-stop mode. In this case, we have a bit | |
5847 | more work to do. Resume the current thread, and if | |
5848 | we had paused all threads, restart them while the | |
5849 | signal handler runs. */ | |
372316f1 PA |
5850 | keep_going (ecs); |
5851 | ||
372316f1 PA |
5852 | if (was_in_line) |
5853 | { | |
372316f1 PA |
5854 | restart_threads (ecs->event_thread); |
5855 | } | |
5856 | else if (debug_infrun) | |
5857 | { | |
5858 | fprintf_unfiltered (gdb_stdlog, | |
5859 | "infrun: no need to restart threads\n"); | |
5860 | } | |
5861 | return; | |
5862 | } | |
5863 | ||
d137e6dc PA |
5864 | /* If we were nexting/stepping some other thread, switch to |
5865 | it, so that we don't continue it, losing control. */ | |
5866 | if (!switch_back_to_stepped_thread (ecs)) | |
5867 | keep_going (ecs); | |
9d799f85 | 5868 | return; |
68f53502 | 5869 | } |
9d799f85 | 5870 | |
e5f8a7cc PA |
5871 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
5872 | && (pc_in_thread_step_range (stop_pc, ecs->event_thread) | |
5873 | || ecs->event_thread->control.step_range_end == 1) | |
edb3359d | 5874 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 5875 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 5876 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
5877 | { |
5878 | /* The inferior is about to take a signal that will take it | |
5879 | out of the single step range. Set a breakpoint at the | |
5880 | current PC (which is presumably where the signal handler | |
5881 | will eventually return) and then allow the inferior to | |
5882 | run free. | |
5883 | ||
5884 | Note that this is only needed for a signal delivered | |
5885 | while in the single-step range. Nested signals aren't a | |
5886 | problem as they eventually all return. */ | |
237fc4c9 PA |
5887 | if (debug_infrun) |
5888 | fprintf_unfiltered (gdb_stdlog, | |
5889 | "infrun: signal may take us out of " | |
5890 | "single-step range\n"); | |
5891 | ||
372316f1 | 5892 | clear_step_over_info (); |
2c03e5be | 5893 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 5894 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
5895 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
5896 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
5897 | keep_going (ecs); |
5898 | return; | |
d303a6c7 | 5899 | } |
9d799f85 AC |
5900 | |
5901 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
5902 | when either there's a nested signal, or when there's a | |
5903 | pending signal enabled just as the signal handler returns | |
5904 | (leaving the inferior at the step-resume-breakpoint without | |
5905 | actually executing it). Either way continue until the | |
5906 | breakpoint is really hit. */ | |
c447ac0b PA |
5907 | |
5908 | if (!switch_back_to_stepped_thread (ecs)) | |
5909 | { | |
5910 | if (debug_infrun) | |
5911 | fprintf_unfiltered (gdb_stdlog, | |
5912 | "infrun: random signal, keep going\n"); | |
5913 | ||
5914 | keep_going (ecs); | |
5915 | } | |
5916 | return; | |
488f131b | 5917 | } |
94c57d6a PA |
5918 | |
5919 | process_event_stop_test (ecs); | |
5920 | } | |
5921 | ||
5922 | /* Come here when we've got some debug event / signal we can explain | |
5923 | (IOW, not a random signal), and test whether it should cause a | |
5924 | stop, or whether we should resume the inferior (transparently). | |
5925 | E.g., could be a breakpoint whose condition evaluates false; we | |
5926 | could be still stepping within the line; etc. */ | |
5927 | ||
5928 | static void | |
5929 | process_event_stop_test (struct execution_control_state *ecs) | |
5930 | { | |
5931 | struct symtab_and_line stop_pc_sal; | |
5932 | struct frame_info *frame; | |
5933 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
5934 | CORE_ADDR jmp_buf_pc; |
5935 | struct bpstat_what what; | |
94c57d6a | 5936 | |
cdaa5b73 | 5937 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 5938 | |
cdaa5b73 PA |
5939 | frame = get_current_frame (); |
5940 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 5941 | |
cdaa5b73 | 5942 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 5943 | |
cdaa5b73 PA |
5944 | if (what.call_dummy) |
5945 | { | |
5946 | stop_stack_dummy = what.call_dummy; | |
5947 | } | |
186c406b | 5948 | |
243a9253 PA |
5949 | /* A few breakpoint types have callbacks associated (e.g., |
5950 | bp_jit_event). Run them now. */ | |
5951 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
5952 | ||
cdaa5b73 PA |
5953 | /* If we hit an internal event that triggers symbol changes, the |
5954 | current frame will be invalidated within bpstat_what (e.g., if we | |
5955 | hit an internal solib event). Re-fetch it. */ | |
5956 | frame = get_current_frame (); | |
5957 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 5958 | |
cdaa5b73 PA |
5959 | switch (what.main_action) |
5960 | { | |
5961 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
5962 | /* If we hit the breakpoint at longjmp while stepping, we | |
5963 | install a momentary breakpoint at the target of the | |
5964 | jmp_buf. */ | |
186c406b | 5965 | |
cdaa5b73 PA |
5966 | if (debug_infrun) |
5967 | fprintf_unfiltered (gdb_stdlog, | |
5968 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 5969 | |
cdaa5b73 | 5970 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 5971 | |
cdaa5b73 PA |
5972 | if (what.is_longjmp) |
5973 | { | |
5974 | struct value *arg_value; | |
5975 | ||
5976 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
5977 | then use it to extract the arguments. The destination PC | |
5978 | is the third argument to the probe. */ | |
5979 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
5980 | if (arg_value) | |
8fa0c4f8 AA |
5981 | { |
5982 | jmp_buf_pc = value_as_address (arg_value); | |
5983 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
5984 | } | |
cdaa5b73 PA |
5985 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
5986 | || !gdbarch_get_longjmp_target (gdbarch, | |
5987 | frame, &jmp_buf_pc)) | |
e2e4d78b | 5988 | { |
cdaa5b73 PA |
5989 | if (debug_infrun) |
5990 | fprintf_unfiltered (gdb_stdlog, | |
5991 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
5992 | "(!gdbarch_get_longjmp_target)\n"); | |
5993 | keep_going (ecs); | |
5994 | return; | |
e2e4d78b | 5995 | } |
e2e4d78b | 5996 | |
cdaa5b73 PA |
5997 | /* Insert a breakpoint at resume address. */ |
5998 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
5999 | } | |
6000 | else | |
6001 | check_exception_resume (ecs, frame); | |
6002 | keep_going (ecs); | |
6003 | return; | |
e81a37f7 | 6004 | |
cdaa5b73 PA |
6005 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6006 | { | |
6007 | struct frame_info *init_frame; | |
e81a37f7 | 6008 | |
cdaa5b73 | 6009 | /* There are several cases to consider. |
c906108c | 6010 | |
cdaa5b73 PA |
6011 | 1. The initiating frame no longer exists. In this case we |
6012 | must stop, because the exception or longjmp has gone too | |
6013 | far. | |
2c03e5be | 6014 | |
cdaa5b73 PA |
6015 | 2. The initiating frame exists, and is the same as the |
6016 | current frame. We stop, because the exception or longjmp | |
6017 | has been caught. | |
2c03e5be | 6018 | |
cdaa5b73 PA |
6019 | 3. The initiating frame exists and is different from the |
6020 | current frame. This means the exception or longjmp has | |
6021 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6022 | |
cdaa5b73 PA |
6023 | 4. longjmp breakpoint has been placed just to protect |
6024 | against stale dummy frames and user is not interested in | |
6025 | stopping around longjmps. */ | |
c5aa993b | 6026 | |
cdaa5b73 PA |
6027 | if (debug_infrun) |
6028 | fprintf_unfiltered (gdb_stdlog, | |
6029 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 6030 | |
cdaa5b73 PA |
6031 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6032 | != NULL); | |
6033 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6034 | |
cdaa5b73 PA |
6035 | if (what.is_longjmp) |
6036 | { | |
b67a2c6f | 6037 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6038 | |
cdaa5b73 | 6039 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6040 | { |
cdaa5b73 PA |
6041 | /* Case 4. */ |
6042 | keep_going (ecs); | |
6043 | return; | |
e5ef252a | 6044 | } |
cdaa5b73 | 6045 | } |
c5aa993b | 6046 | |
cdaa5b73 | 6047 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6048 | |
cdaa5b73 PA |
6049 | if (init_frame) |
6050 | { | |
6051 | struct frame_id current_id | |
6052 | = get_frame_id (get_current_frame ()); | |
6053 | if (frame_id_eq (current_id, | |
6054 | ecs->event_thread->initiating_frame)) | |
6055 | { | |
6056 | /* Case 2. Fall through. */ | |
6057 | } | |
6058 | else | |
6059 | { | |
6060 | /* Case 3. */ | |
6061 | keep_going (ecs); | |
6062 | return; | |
6063 | } | |
68f53502 | 6064 | } |
488f131b | 6065 | |
cdaa5b73 PA |
6066 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6067 | exists. */ | |
6068 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6069 | |
bdc36728 | 6070 | end_stepping_range (ecs); |
cdaa5b73 PA |
6071 | } |
6072 | return; | |
e5ef252a | 6073 | |
cdaa5b73 PA |
6074 | case BPSTAT_WHAT_SINGLE: |
6075 | if (debug_infrun) | |
6076 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
6077 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6078 | /* Still need to check other stuff, at least the case where we | |
6079 | are stepping and step out of the right range. */ | |
6080 | break; | |
e5ef252a | 6081 | |
cdaa5b73 PA |
6082 | case BPSTAT_WHAT_STEP_RESUME: |
6083 | if (debug_infrun) | |
6084 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 6085 | |
cdaa5b73 PA |
6086 | delete_step_resume_breakpoint (ecs->event_thread); |
6087 | if (ecs->event_thread->control.proceed_to_finish | |
6088 | && execution_direction == EXEC_REVERSE) | |
6089 | { | |
6090 | struct thread_info *tp = ecs->event_thread; | |
6091 | ||
6092 | /* We are finishing a function in reverse, and just hit the | |
6093 | step-resume breakpoint at the start address of the | |
6094 | function, and we're almost there -- just need to back up | |
6095 | by one more single-step, which should take us back to the | |
6096 | function call. */ | |
6097 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6098 | keep_going (ecs); | |
e5ef252a | 6099 | return; |
cdaa5b73 PA |
6100 | } |
6101 | fill_in_stop_func (gdbarch, ecs); | |
6102 | if (stop_pc == ecs->stop_func_start | |
6103 | && execution_direction == EXEC_REVERSE) | |
6104 | { | |
6105 | /* We are stepping over a function call in reverse, and just | |
6106 | hit the step-resume breakpoint at the start address of | |
6107 | the function. Go back to single-stepping, which should | |
6108 | take us back to the function call. */ | |
6109 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6110 | keep_going (ecs); | |
6111 | return; | |
6112 | } | |
6113 | break; | |
e5ef252a | 6114 | |
cdaa5b73 PA |
6115 | case BPSTAT_WHAT_STOP_NOISY: |
6116 | if (debug_infrun) | |
6117 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
6118 | stop_print_frame = 1; | |
e5ef252a | 6119 | |
99619bea PA |
6120 | /* Assume the thread stopped for a breapoint. We'll still check |
6121 | whether a/the breakpoint is there when the thread is next | |
6122 | resumed. */ | |
6123 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6124 | |
22bcd14b | 6125 | stop_waiting (ecs); |
cdaa5b73 | 6126 | return; |
e5ef252a | 6127 | |
cdaa5b73 PA |
6128 | case BPSTAT_WHAT_STOP_SILENT: |
6129 | if (debug_infrun) | |
6130 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
6131 | stop_print_frame = 0; | |
e5ef252a | 6132 | |
99619bea PA |
6133 | /* Assume the thread stopped for a breapoint. We'll still check |
6134 | whether a/the breakpoint is there when the thread is next | |
6135 | resumed. */ | |
6136 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6137 | stop_waiting (ecs); |
cdaa5b73 PA |
6138 | return; |
6139 | ||
6140 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
6141 | if (debug_infrun) | |
6142 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
6143 | ||
6144 | delete_step_resume_breakpoint (ecs->event_thread); | |
6145 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6146 | { | |
6147 | /* Back when the step-resume breakpoint was inserted, we | |
6148 | were trying to single-step off a breakpoint. Go back to | |
6149 | doing that. */ | |
6150 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6151 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6152 | keep_going (ecs); | |
6153 | return; | |
e5ef252a | 6154 | } |
cdaa5b73 PA |
6155 | break; |
6156 | ||
6157 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6158 | break; | |
e5ef252a | 6159 | } |
c906108c | 6160 | |
af48d08f PA |
6161 | /* If we stepped a permanent breakpoint and we had a high priority |
6162 | step-resume breakpoint for the address we stepped, but we didn't | |
6163 | hit it, then we must have stepped into the signal handler. The | |
6164 | step-resume was only necessary to catch the case of _not_ | |
6165 | stepping into the handler, so delete it, and fall through to | |
6166 | checking whether the step finished. */ | |
6167 | if (ecs->event_thread->stepped_breakpoint) | |
6168 | { | |
6169 | struct breakpoint *sr_bp | |
6170 | = ecs->event_thread->control.step_resume_breakpoint; | |
6171 | ||
8d707a12 PA |
6172 | if (sr_bp != NULL |
6173 | && sr_bp->loc->permanent | |
af48d08f PA |
6174 | && sr_bp->type == bp_hp_step_resume |
6175 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6176 | { | |
6177 | if (debug_infrun) | |
6178 | fprintf_unfiltered (gdb_stdlog, | |
6179 | "infrun: stepped permanent breakpoint, stopped in " | |
6180 | "handler\n"); | |
6181 | delete_step_resume_breakpoint (ecs->event_thread); | |
6182 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6183 | } | |
6184 | } | |
6185 | ||
cdaa5b73 PA |
6186 | /* We come here if we hit a breakpoint but should not stop for it. |
6187 | Possibly we also were stepping and should stop for that. So fall | |
6188 | through and test for stepping. But, if not stepping, do not | |
6189 | stop. */ | |
c906108c | 6190 | |
a7212384 UW |
6191 | /* In all-stop mode, if we're currently stepping but have stopped in |
6192 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6193 | if (switch_back_to_stepped_thread (ecs)) |
6194 | return; | |
776f04fa | 6195 | |
8358c15c | 6196 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6197 | { |
527159b7 | 6198 | if (debug_infrun) |
d3169d93 DJ |
6199 | fprintf_unfiltered (gdb_stdlog, |
6200 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 6201 | |
488f131b JB |
6202 | /* Having a step-resume breakpoint overrides anything |
6203 | else having to do with stepping commands until | |
6204 | that breakpoint is reached. */ | |
488f131b JB |
6205 | keep_going (ecs); |
6206 | return; | |
6207 | } | |
c5aa993b | 6208 | |
16c381f0 | 6209 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6210 | { |
527159b7 | 6211 | if (debug_infrun) |
8a9de0e4 | 6212 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 6213 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6214 | keep_going (ecs); |
6215 | return; | |
6216 | } | |
c5aa993b | 6217 | |
4b7703ad JB |
6218 | /* Re-fetch current thread's frame in case the code above caused |
6219 | the frame cache to be re-initialized, making our FRAME variable | |
6220 | a dangling pointer. */ | |
6221 | frame = get_current_frame (); | |
628fe4e4 | 6222 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6223 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6224 | |
488f131b | 6225 | /* If stepping through a line, keep going if still within it. |
c906108c | 6226 | |
488f131b JB |
6227 | Note that step_range_end is the address of the first instruction |
6228 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6229 | within it! |
6230 | ||
6231 | Note also that during reverse execution, we may be stepping | |
6232 | through a function epilogue and therefore must detect when | |
6233 | the current-frame changes in the middle of a line. */ | |
6234 | ||
ce4c476a | 6235 | if (pc_in_thread_step_range (stop_pc, ecs->event_thread) |
31410e84 | 6236 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6237 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6238 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6239 | { |
527159b7 | 6240 | if (debug_infrun) |
5af949e3 UW |
6241 | fprintf_unfiltered |
6242 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
6243 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
6244 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6245 | |
c1e36e3e PA |
6246 | /* Tentatively re-enable range stepping; `resume' disables it if |
6247 | necessary (e.g., if we're stepping over a breakpoint or we | |
6248 | have software watchpoints). */ | |
6249 | ecs->event_thread->control.may_range_step = 1; | |
6250 | ||
b2175913 MS |
6251 | /* When stepping backward, stop at beginning of line range |
6252 | (unless it's the function entry point, in which case | |
6253 | keep going back to the call point). */ | |
16c381f0 | 6254 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6255 | && stop_pc != ecs->stop_func_start |
6256 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6257 | end_stepping_range (ecs); |
b2175913 MS |
6258 | else |
6259 | keep_going (ecs); | |
6260 | ||
488f131b JB |
6261 | return; |
6262 | } | |
c5aa993b | 6263 | |
488f131b | 6264 | /* We stepped out of the stepping range. */ |
c906108c | 6265 | |
488f131b | 6266 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6267 | loader dynamic symbol resolution code... |
6268 | ||
6269 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6270 | time loader code and reach the callee's address. | |
6271 | ||
6272 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6273 | the runtime loader code is handled just like any other | |
6274 | undebuggable function call. Now we need only keep stepping | |
6275 | backward through the trampoline code, and that's handled further | |
6276 | down, so there is nothing for us to do here. */ | |
6277 | ||
6278 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6279 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
cfd8ab24 | 6280 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 6281 | { |
4c8c40e6 | 6282 | CORE_ADDR pc_after_resolver = |
568d6575 | 6283 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); |
c906108c | 6284 | |
527159b7 | 6285 | if (debug_infrun) |
3e43a32a MS |
6286 | fprintf_unfiltered (gdb_stdlog, |
6287 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 6288 | |
488f131b JB |
6289 | if (pc_after_resolver) |
6290 | { | |
6291 | /* Set up a step-resume breakpoint at the address | |
6292 | indicated by SKIP_SOLIB_RESOLVER. */ | |
6293 | struct symtab_and_line sr_sal; | |
abbb1732 | 6294 | |
fe39c653 | 6295 | init_sal (&sr_sal); |
488f131b | 6296 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6297 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6298 | |
a6d9a66e UW |
6299 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6300 | sr_sal, null_frame_id); | |
c5aa993b | 6301 | } |
c906108c | 6302 | |
488f131b JB |
6303 | keep_going (ecs); |
6304 | return; | |
6305 | } | |
c906108c | 6306 | |
16c381f0 JK |
6307 | if (ecs->event_thread->control.step_range_end != 1 |
6308 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6309 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6310 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6311 | { |
527159b7 | 6312 | if (debug_infrun) |
3e43a32a MS |
6313 | fprintf_unfiltered (gdb_stdlog, |
6314 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 6315 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6316 | a signal trampoline (either by a signal being delivered or by |
6317 | the signal handler returning). Just single-step until the | |
6318 | inferior leaves the trampoline (either by calling the handler | |
6319 | or returning). */ | |
488f131b JB |
6320 | keep_going (ecs); |
6321 | return; | |
6322 | } | |
c906108c | 6323 | |
14132e89 MR |
6324 | /* If we're in the return path from a shared library trampoline, |
6325 | we want to proceed through the trampoline when stepping. */ | |
6326 | /* macro/2012-04-25: This needs to come before the subroutine | |
6327 | call check below as on some targets return trampolines look | |
6328 | like subroutine calls (MIPS16 return thunks). */ | |
6329 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
6330 | stop_pc, ecs->stop_func_name) | |
6331 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) | |
6332 | { | |
6333 | /* Determine where this trampoline returns. */ | |
6334 | CORE_ADDR real_stop_pc; | |
6335 | ||
6336 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
6337 | ||
6338 | if (debug_infrun) | |
6339 | fprintf_unfiltered (gdb_stdlog, | |
6340 | "infrun: stepped into solib return tramp\n"); | |
6341 | ||
6342 | /* Only proceed through if we know where it's going. */ | |
6343 | if (real_stop_pc) | |
6344 | { | |
6345 | /* And put the step-breakpoint there and go until there. */ | |
6346 | struct symtab_and_line sr_sal; | |
6347 | ||
6348 | init_sal (&sr_sal); /* initialize to zeroes */ | |
6349 | sr_sal.pc = real_stop_pc; | |
6350 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6351 | sr_sal.pspace = get_frame_program_space (frame); | |
6352 | ||
6353 | /* Do not specify what the fp should be when we stop since | |
6354 | on some machines the prologue is where the new fp value | |
6355 | is established. */ | |
6356 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6357 | sr_sal, null_frame_id); | |
6358 | ||
6359 | /* Restart without fiddling with the step ranges or | |
6360 | other state. */ | |
6361 | keep_going (ecs); | |
6362 | return; | |
6363 | } | |
6364 | } | |
6365 | ||
c17eaafe DJ |
6366 | /* Check for subroutine calls. The check for the current frame |
6367 | equalling the step ID is not necessary - the check of the | |
6368 | previous frame's ID is sufficient - but it is a common case and | |
6369 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6370 | |
6371 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6372 | being equal, so to get into this block, both the current and | |
6373 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6374 | /* The outer_frame_id check is a heuristic to detect stepping |
6375 | through startup code. If we step over an instruction which | |
6376 | sets the stack pointer from an invalid value to a valid value, | |
6377 | we may detect that as a subroutine call from the mythical | |
6378 | "outermost" function. This could be fixed by marking | |
6379 | outermost frames as !stack_p,code_p,special_p. Then the | |
6380 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6381 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6382 | for more. */ |
edb3359d | 6383 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6384 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6385 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6386 | ecs->event_thread->control.step_stack_frame_id) |
6387 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6388 | outer_frame_id) |
885eeb5b PA |
6389 | || (ecs->event_thread->control.step_start_function |
6390 | != find_pc_function (stop_pc))))) | |
488f131b | 6391 | { |
95918acb | 6392 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6393 | |
527159b7 | 6394 | if (debug_infrun) |
8a9de0e4 | 6395 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 6396 | |
b7a084be | 6397 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6398 | { |
6399 | /* I presume that step_over_calls is only 0 when we're | |
6400 | supposed to be stepping at the assembly language level | |
6401 | ("stepi"). Just stop. */ | |
388a8562 | 6402 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6403 | end_stepping_range (ecs); |
95918acb AC |
6404 | return; |
6405 | } | |
8fb3e588 | 6406 | |
388a8562 MS |
6407 | /* Reverse stepping through solib trampolines. */ |
6408 | ||
6409 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6410 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6411 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6412 | || (ecs->stop_func_start == 0 | |
6413 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6414 | { | |
6415 | /* Any solib trampoline code can be handled in reverse | |
6416 | by simply continuing to single-step. We have already | |
6417 | executed the solib function (backwards), and a few | |
6418 | steps will take us back through the trampoline to the | |
6419 | caller. */ | |
6420 | keep_going (ecs); | |
6421 | return; | |
6422 | } | |
6423 | ||
16c381f0 | 6424 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6425 | { |
b2175913 MS |
6426 | /* We're doing a "next". |
6427 | ||
6428 | Normal (forward) execution: set a breakpoint at the | |
6429 | callee's return address (the address at which the caller | |
6430 | will resume). | |
6431 | ||
6432 | Reverse (backward) execution. set the step-resume | |
6433 | breakpoint at the start of the function that we just | |
6434 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6435 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6436 | |
6437 | if (execution_direction == EXEC_REVERSE) | |
6438 | { | |
acf9414f JK |
6439 | /* If we're already at the start of the function, we've either |
6440 | just stepped backward into a single instruction function, | |
6441 | or stepped back out of a signal handler to the first instruction | |
6442 | of the function. Just keep going, which will single-step back | |
6443 | to the caller. */ | |
58c48e72 | 6444 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f JK |
6445 | { |
6446 | struct symtab_and_line sr_sal; | |
6447 | ||
6448 | /* Normal function call return (static or dynamic). */ | |
6449 | init_sal (&sr_sal); | |
6450 | sr_sal.pc = ecs->stop_func_start; | |
6451 | sr_sal.pspace = get_frame_program_space (frame); | |
6452 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6453 | sr_sal, null_frame_id); | |
6454 | } | |
b2175913 MS |
6455 | } |
6456 | else | |
568d6575 | 6457 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6458 | |
8567c30f AC |
6459 | keep_going (ecs); |
6460 | return; | |
6461 | } | |
a53c66de | 6462 | |
95918acb | 6463 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6464 | calling routine and the real function), locate the real |
6465 | function. That's what tells us (a) whether we want to step | |
6466 | into it at all, and (b) what prologue we want to run to the | |
6467 | end of, if we do step into it. */ | |
568d6575 | 6468 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6469 | if (real_stop_pc == 0) |
568d6575 | 6470 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6471 | if (real_stop_pc != 0) |
6472 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6473 | |
db5f024e | 6474 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 RC |
6475 | { |
6476 | struct symtab_and_line sr_sal; | |
abbb1732 | 6477 | |
1b2bfbb9 RC |
6478 | init_sal (&sr_sal); |
6479 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 6480 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6481 | |
a6d9a66e UW |
6482 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6483 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6484 | keep_going (ecs); |
6485 | return; | |
1b2bfbb9 RC |
6486 | } |
6487 | ||
95918acb | 6488 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6489 | thinking of stepping into and the function isn't on the skip |
6490 | list, step into it. | |
95918acb | 6491 | |
8fb3e588 AC |
6492 | If there are several symtabs at that PC (e.g. with include |
6493 | files), just want to know whether *any* of them have line | |
6494 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6495 | { |
6496 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6497 | |
95918acb | 6498 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6499 | if (tmp_sal.line != 0 |
85817405 JK |
6500 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
6501 | &tmp_sal)) | |
95918acb | 6502 | { |
b2175913 | 6503 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6504 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6505 | else |
568d6575 | 6506 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6507 | return; |
6508 | } | |
6509 | } | |
6510 | ||
6511 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6512 | set, we stop the step so that the user has a chance to switch |
6513 | in assembly mode. */ | |
16c381f0 | 6514 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6515 | && step_stop_if_no_debug) |
95918acb | 6516 | { |
bdc36728 | 6517 | end_stepping_range (ecs); |
95918acb AC |
6518 | return; |
6519 | } | |
6520 | ||
b2175913 MS |
6521 | if (execution_direction == EXEC_REVERSE) |
6522 | { | |
acf9414f JK |
6523 | /* If we're already at the start of the function, we've either just |
6524 | stepped backward into a single instruction function without line | |
6525 | number info, or stepped back out of a signal handler to the first | |
6526 | instruction of the function without line number info. Just keep | |
6527 | going, which will single-step back to the caller. */ | |
6528 | if (ecs->stop_func_start != stop_pc) | |
6529 | { | |
6530 | /* Set a breakpoint at callee's start address. | |
6531 | From there we can step once and be back in the caller. */ | |
6532 | struct symtab_and_line sr_sal; | |
abbb1732 | 6533 | |
acf9414f JK |
6534 | init_sal (&sr_sal); |
6535 | sr_sal.pc = ecs->stop_func_start; | |
6536 | sr_sal.pspace = get_frame_program_space (frame); | |
6537 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6538 | sr_sal, null_frame_id); | |
6539 | } | |
b2175913 MS |
6540 | } |
6541 | else | |
6542 | /* Set a breakpoint at callee's return address (the address | |
6543 | at which the caller will resume). */ | |
568d6575 | 6544 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6545 | |
95918acb | 6546 | keep_going (ecs); |
488f131b | 6547 | return; |
488f131b | 6548 | } |
c906108c | 6549 | |
fdd654f3 MS |
6550 | /* Reverse stepping through solib trampolines. */ |
6551 | ||
6552 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6553 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 MS |
6554 | { |
6555 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
6556 | || (ecs->stop_func_start == 0 | |
6557 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6558 | { | |
6559 | /* Any solib trampoline code can be handled in reverse | |
6560 | by simply continuing to single-step. We have already | |
6561 | executed the solib function (backwards), and a few | |
6562 | steps will take us back through the trampoline to the | |
6563 | caller. */ | |
6564 | keep_going (ecs); | |
6565 | return; | |
6566 | } | |
6567 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6568 | { | |
6569 | /* Stepped backward into the solib dynsym resolver. | |
6570 | Set a breakpoint at its start and continue, then | |
6571 | one more step will take us out. */ | |
6572 | struct symtab_and_line sr_sal; | |
abbb1732 | 6573 | |
fdd654f3 MS |
6574 | init_sal (&sr_sal); |
6575 | sr_sal.pc = ecs->stop_func_start; | |
9d1807c3 | 6576 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6577 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6578 | sr_sal, null_frame_id); | |
6579 | keep_going (ecs); | |
6580 | return; | |
6581 | } | |
6582 | } | |
6583 | ||
2afb61aa | 6584 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 6585 | |
1b2bfbb9 RC |
6586 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6587 | the trampoline processing logic, however, there are some trampolines | |
6588 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6589 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6590 | && ecs->stop_func_name == NULL |
2afb61aa | 6591 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6592 | { |
527159b7 | 6593 | if (debug_infrun) |
3e43a32a MS |
6594 | fprintf_unfiltered (gdb_stdlog, |
6595 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 6596 | |
1b2bfbb9 | 6597 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6598 | undebuggable function (where there is no debugging information |
6599 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6600 | inferior stopped). Since we want to skip this kind of code, |
6601 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6602 | function - unless the user has asked us not to (via |
6603 | set step-mode) or we no longer know how to get back | |
6604 | to the call site. */ | |
6605 | if (step_stop_if_no_debug | |
c7ce8faa | 6606 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6607 | { |
6608 | /* If we have no line number and the step-stop-if-no-debug | |
6609 | is set, we stop the step so that the user has a chance to | |
6610 | switch in assembly mode. */ | |
bdc36728 | 6611 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6612 | return; |
6613 | } | |
6614 | else | |
6615 | { | |
6616 | /* Set a breakpoint at callee's return address (the address | |
6617 | at which the caller will resume). */ | |
568d6575 | 6618 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6619 | keep_going (ecs); |
6620 | return; | |
6621 | } | |
6622 | } | |
6623 | ||
16c381f0 | 6624 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6625 | { |
6626 | /* It is stepi or nexti. We always want to stop stepping after | |
6627 | one instruction. */ | |
527159b7 | 6628 | if (debug_infrun) |
8a9de0e4 | 6629 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 6630 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6631 | return; |
6632 | } | |
6633 | ||
2afb61aa | 6634 | if (stop_pc_sal.line == 0) |
488f131b JB |
6635 | { |
6636 | /* We have no line number information. That means to stop | |
6637 | stepping (does this always happen right after one instruction, | |
6638 | when we do "s" in a function with no line numbers, | |
6639 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 6640 | if (debug_infrun) |
8a9de0e4 | 6641 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 6642 | end_stepping_range (ecs); |
488f131b JB |
6643 | return; |
6644 | } | |
c906108c | 6645 | |
edb3359d DJ |
6646 | /* Look for "calls" to inlined functions, part one. If the inline |
6647 | frame machinery detected some skipped call sites, we have entered | |
6648 | a new inline function. */ | |
6649 | ||
6650 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6651 | ecs->event_thread->control.step_frame_id) |
edb3359d DJ |
6652 | && inline_skipped_frames (ecs->ptid)) |
6653 | { | |
6654 | struct symtab_and_line call_sal; | |
6655 | ||
6656 | if (debug_infrun) | |
6657 | fprintf_unfiltered (gdb_stdlog, | |
6658 | "infrun: stepped into inlined function\n"); | |
6659 | ||
6660 | find_frame_sal (get_current_frame (), &call_sal); | |
6661 | ||
16c381f0 | 6662 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
6663 | { |
6664 | /* For "step", we're going to stop. But if the call site | |
6665 | for this inlined function is on the same source line as | |
6666 | we were previously stepping, go down into the function | |
6667 | first. Otherwise stop at the call site. */ | |
6668 | ||
6669 | if (call_sal.line == ecs->event_thread->current_line | |
6670 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6671 | step_into_inline_frame (ecs->ptid); | |
6672 | ||
bdc36728 | 6673 | end_stepping_range (ecs); |
edb3359d DJ |
6674 | return; |
6675 | } | |
6676 | else | |
6677 | { | |
6678 | /* For "next", we should stop at the call site if it is on a | |
6679 | different source line. Otherwise continue through the | |
6680 | inlined function. */ | |
6681 | if (call_sal.line == ecs->event_thread->current_line | |
6682 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6683 | keep_going (ecs); | |
6684 | else | |
bdc36728 | 6685 | end_stepping_range (ecs); |
edb3359d DJ |
6686 | return; |
6687 | } | |
6688 | } | |
6689 | ||
6690 | /* Look for "calls" to inlined functions, part two. If we are still | |
6691 | in the same real function we were stepping through, but we have | |
6692 | to go further up to find the exact frame ID, we are stepping | |
6693 | through a more inlined call beyond its call site. */ | |
6694 | ||
6695 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
6696 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6697 | ecs->event_thread->control.step_frame_id) |
edb3359d | 6698 | && stepped_in_from (get_current_frame (), |
16c381f0 | 6699 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
6700 | { |
6701 | if (debug_infrun) | |
6702 | fprintf_unfiltered (gdb_stdlog, | |
6703 | "infrun: stepping through inlined function\n"); | |
6704 | ||
16c381f0 | 6705 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
6706 | keep_going (ecs); |
6707 | else | |
bdc36728 | 6708 | end_stepping_range (ecs); |
edb3359d DJ |
6709 | return; |
6710 | } | |
6711 | ||
2afb61aa | 6712 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
6713 | && (ecs->event_thread->current_line != stop_pc_sal.line |
6714 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
6715 | { |
6716 | /* We are at the start of a different line. So stop. Note that | |
6717 | we don't stop if we step into the middle of a different line. | |
6718 | That is said to make things like for (;;) statements work | |
6719 | better. */ | |
527159b7 | 6720 | if (debug_infrun) |
3e43a32a MS |
6721 | fprintf_unfiltered (gdb_stdlog, |
6722 | "infrun: stepped to a different line\n"); | |
bdc36728 | 6723 | end_stepping_range (ecs); |
488f131b JB |
6724 | return; |
6725 | } | |
c906108c | 6726 | |
488f131b | 6727 | /* We aren't done stepping. |
c906108c | 6728 | |
488f131b JB |
6729 | Optimize by setting the stepping range to the line. |
6730 | (We might not be in the original line, but if we entered a | |
6731 | new line in mid-statement, we continue stepping. This makes | |
6732 | things like for(;;) statements work better.) */ | |
c906108c | 6733 | |
16c381f0 JK |
6734 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
6735 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 6736 | ecs->event_thread->control.may_range_step = 1; |
edb3359d | 6737 | set_step_info (frame, stop_pc_sal); |
488f131b | 6738 | |
527159b7 | 6739 | if (debug_infrun) |
8a9de0e4 | 6740 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 6741 | keep_going (ecs); |
104c1213 JM |
6742 | } |
6743 | ||
c447ac0b PA |
6744 | /* In all-stop mode, if we're currently stepping but have stopped in |
6745 | some other thread, we may need to switch back to the stepped | |
6746 | thread. Returns true we set the inferior running, false if we left | |
6747 | it stopped (and the event needs further processing). */ | |
6748 | ||
6749 | static int | |
6750 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
6751 | { | |
fbea99ea | 6752 | if (!target_is_non_stop_p ()) |
c447ac0b PA |
6753 | { |
6754 | struct thread_info *tp; | |
99619bea PA |
6755 | struct thread_info *stepping_thread; |
6756 | ||
6757 | /* If any thread is blocked on some internal breakpoint, and we | |
6758 | simply need to step over that breakpoint to get it going | |
6759 | again, do that first. */ | |
6760 | ||
6761 | /* However, if we see an event for the stepping thread, then we | |
6762 | know all other threads have been moved past their breakpoints | |
6763 | already. Let the caller check whether the step is finished, | |
6764 | etc., before deciding to move it past a breakpoint. */ | |
6765 | if (ecs->event_thread->control.step_range_end != 0) | |
6766 | return 0; | |
6767 | ||
6768 | /* Check if the current thread is blocked on an incomplete | |
6769 | step-over, interrupted by a random signal. */ | |
6770 | if (ecs->event_thread->control.trap_expected | |
6771 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 6772 | { |
99619bea PA |
6773 | if (debug_infrun) |
6774 | { | |
6775 | fprintf_unfiltered (gdb_stdlog, | |
6776 | "infrun: need to finish step-over of [%s]\n", | |
6777 | target_pid_to_str (ecs->event_thread->ptid)); | |
6778 | } | |
6779 | keep_going (ecs); | |
6780 | return 1; | |
6781 | } | |
2adfaa28 | 6782 | |
99619bea PA |
6783 | /* Check if the current thread is blocked by a single-step |
6784 | breakpoint of another thread. */ | |
6785 | if (ecs->hit_singlestep_breakpoint) | |
6786 | { | |
6787 | if (debug_infrun) | |
6788 | { | |
6789 | fprintf_unfiltered (gdb_stdlog, | |
6790 | "infrun: need to step [%s] over single-step " | |
6791 | "breakpoint\n", | |
6792 | target_pid_to_str (ecs->ptid)); | |
6793 | } | |
6794 | keep_going (ecs); | |
6795 | return 1; | |
6796 | } | |
6797 | ||
4d9d9d04 PA |
6798 | /* If this thread needs yet another step-over (e.g., stepping |
6799 | through a delay slot), do it first before moving on to | |
6800 | another thread. */ | |
6801 | if (thread_still_needs_step_over (ecs->event_thread)) | |
6802 | { | |
6803 | if (debug_infrun) | |
6804 | { | |
6805 | fprintf_unfiltered (gdb_stdlog, | |
6806 | "infrun: thread [%s] still needs step-over\n", | |
6807 | target_pid_to_str (ecs->event_thread->ptid)); | |
6808 | } | |
6809 | keep_going (ecs); | |
6810 | return 1; | |
6811 | } | |
70509625 | 6812 | |
483805cf PA |
6813 | /* If scheduler locking applies even if not stepping, there's no |
6814 | need to walk over threads. Above we've checked whether the | |
6815 | current thread is stepping. If some other thread not the | |
6816 | event thread is stepping, then it must be that scheduler | |
6817 | locking is not in effect. */ | |
856e7dd6 | 6818 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
6819 | return 0; |
6820 | ||
4d9d9d04 PA |
6821 | /* Otherwise, we no longer expect a trap in the current thread. |
6822 | Clear the trap_expected flag before switching back -- this is | |
6823 | what keep_going does as well, if we call it. */ | |
6824 | ecs->event_thread->control.trap_expected = 0; | |
6825 | ||
6826 | /* Likewise, clear the signal if it should not be passed. */ | |
6827 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
6828 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
6829 | ||
6830 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 6831 | step/next/etc. */ |
4d9d9d04 PA |
6832 | if (start_step_over ()) |
6833 | { | |
6834 | prepare_to_wait (ecs); | |
6835 | return 1; | |
6836 | } | |
6837 | ||
6838 | /* Look for the stepping/nexting thread. */ | |
483805cf | 6839 | stepping_thread = NULL; |
4d9d9d04 | 6840 | |
034f788c | 6841 | ALL_NON_EXITED_THREADS (tp) |
483805cf | 6842 | { |
fbea99ea PA |
6843 | /* Ignore threads of processes the caller is not |
6844 | resuming. */ | |
483805cf | 6845 | if (!sched_multi |
1afd5965 | 6846 | && ptid_get_pid (tp->ptid) != ptid_get_pid (ecs->ptid)) |
483805cf PA |
6847 | continue; |
6848 | ||
6849 | /* When stepping over a breakpoint, we lock all threads | |
6850 | except the one that needs to move past the breakpoint. | |
6851 | If a non-event thread has this set, the "incomplete | |
6852 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
6853 | if (tp->control.trap_expected) |
6854 | { | |
6855 | internal_error (__FILE__, __LINE__, | |
6856 | "[%s] has inconsistent state: " | |
6857 | "trap_expected=%d\n", | |
6858 | target_pid_to_str (tp->ptid), | |
6859 | tp->control.trap_expected); | |
6860 | } | |
483805cf PA |
6861 | |
6862 | /* Did we find the stepping thread? */ | |
6863 | if (tp->control.step_range_end) | |
6864 | { | |
6865 | /* Yep. There should only one though. */ | |
6866 | gdb_assert (stepping_thread == NULL); | |
6867 | ||
6868 | /* The event thread is handled at the top, before we | |
6869 | enter this loop. */ | |
6870 | gdb_assert (tp != ecs->event_thread); | |
6871 | ||
6872 | /* If some thread other than the event thread is | |
6873 | stepping, then scheduler locking can't be in effect, | |
6874 | otherwise we wouldn't have resumed the current event | |
6875 | thread in the first place. */ | |
856e7dd6 | 6876 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
6877 | |
6878 | stepping_thread = tp; | |
6879 | } | |
99619bea PA |
6880 | } |
6881 | ||
483805cf | 6882 | if (stepping_thread != NULL) |
99619bea | 6883 | { |
c447ac0b PA |
6884 | if (debug_infrun) |
6885 | fprintf_unfiltered (gdb_stdlog, | |
6886 | "infrun: switching back to stepped thread\n"); | |
6887 | ||
2ac7589c PA |
6888 | if (keep_going_stepped_thread (stepping_thread)) |
6889 | { | |
6890 | prepare_to_wait (ecs); | |
6891 | return 1; | |
6892 | } | |
6893 | } | |
6894 | } | |
2adfaa28 | 6895 | |
2ac7589c PA |
6896 | return 0; |
6897 | } | |
2adfaa28 | 6898 | |
2ac7589c PA |
6899 | /* Set a previously stepped thread back to stepping. Returns true on |
6900 | success, false if the resume is not possible (e.g., the thread | |
6901 | vanished). */ | |
6902 | ||
6903 | static int | |
6904 | keep_going_stepped_thread (struct thread_info *tp) | |
6905 | { | |
6906 | struct frame_info *frame; | |
6907 | struct gdbarch *gdbarch; | |
6908 | struct execution_control_state ecss; | |
6909 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 6910 | |
2ac7589c PA |
6911 | /* If the stepping thread exited, then don't try to switch back and |
6912 | resume it, which could fail in several different ways depending | |
6913 | on the target. Instead, just keep going. | |
2adfaa28 | 6914 | |
2ac7589c PA |
6915 | We can find a stepping dead thread in the thread list in two |
6916 | cases: | |
2adfaa28 | 6917 | |
2ac7589c PA |
6918 | - The target supports thread exit events, and when the target |
6919 | tries to delete the thread from the thread list, inferior_ptid | |
6920 | pointed at the exiting thread. In such case, calling | |
6921 | delete_thread does not really remove the thread from the list; | |
6922 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 6923 | |
2ac7589c PA |
6924 | - The target's debug interface does not support thread exit |
6925 | events, and so we have no idea whatsoever if the previously | |
6926 | stepping thread is still alive. For that reason, we need to | |
6927 | synchronously query the target now. */ | |
2adfaa28 | 6928 | |
2ac7589c PA |
6929 | if (is_exited (tp->ptid) |
6930 | || !target_thread_alive (tp->ptid)) | |
6931 | { | |
6932 | if (debug_infrun) | |
6933 | fprintf_unfiltered (gdb_stdlog, | |
6934 | "infrun: not resuming previously " | |
6935 | "stepped thread, it has vanished\n"); | |
6936 | ||
6937 | delete_thread (tp->ptid); | |
6938 | return 0; | |
c447ac0b | 6939 | } |
2ac7589c PA |
6940 | |
6941 | if (debug_infrun) | |
6942 | fprintf_unfiltered (gdb_stdlog, | |
6943 | "infrun: resuming previously stepped thread\n"); | |
6944 | ||
6945 | reset_ecs (ecs, tp); | |
6946 | switch_to_thread (tp->ptid); | |
6947 | ||
6948 | stop_pc = regcache_read_pc (get_thread_regcache (tp->ptid)); | |
6949 | frame = get_current_frame (); | |
6950 | gdbarch = get_frame_arch (frame); | |
6951 | ||
6952 | /* If the PC of the thread we were trying to single-step has | |
6953 | changed, then that thread has trapped or been signaled, but the | |
6954 | event has not been reported to GDB yet. Re-poll the target | |
6955 | looking for this particular thread's event (i.e. temporarily | |
6956 | enable schedlock) by: | |
6957 | ||
6958 | - setting a break at the current PC | |
6959 | - resuming that particular thread, only (by setting trap | |
6960 | expected) | |
6961 | ||
6962 | This prevents us continuously moving the single-step breakpoint | |
6963 | forward, one instruction at a time, overstepping. */ | |
6964 | ||
6965 | if (stop_pc != tp->prev_pc) | |
6966 | { | |
6967 | ptid_t resume_ptid; | |
6968 | ||
6969 | if (debug_infrun) | |
6970 | fprintf_unfiltered (gdb_stdlog, | |
6971 | "infrun: expected thread advanced also (%s -> %s)\n", | |
6972 | paddress (target_gdbarch (), tp->prev_pc), | |
6973 | paddress (target_gdbarch (), stop_pc)); | |
6974 | ||
6975 | /* Clear the info of the previous step-over, as it's no longer | |
6976 | valid (if the thread was trying to step over a breakpoint, it | |
6977 | has already succeeded). It's what keep_going would do too, | |
6978 | if we called it. Do this before trying to insert the sss | |
6979 | breakpoint, otherwise if we were previously trying to step | |
6980 | over this exact address in another thread, the breakpoint is | |
6981 | skipped. */ | |
6982 | clear_step_over_info (); | |
6983 | tp->control.trap_expected = 0; | |
6984 | ||
6985 | insert_single_step_breakpoint (get_frame_arch (frame), | |
6986 | get_frame_address_space (frame), | |
6987 | stop_pc); | |
6988 | ||
372316f1 | 6989 | tp->resumed = 1; |
fbea99ea | 6990 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
6991 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
6992 | } | |
6993 | else | |
6994 | { | |
6995 | if (debug_infrun) | |
6996 | fprintf_unfiltered (gdb_stdlog, | |
6997 | "infrun: expected thread still hasn't advanced\n"); | |
6998 | ||
6999 | keep_going_pass_signal (ecs); | |
7000 | } | |
7001 | return 1; | |
c447ac0b PA |
7002 | } |
7003 | ||
8b061563 PA |
7004 | /* Is thread TP in the middle of (software or hardware) |
7005 | single-stepping? (Note the result of this function must never be | |
7006 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7007 | |
a289b8f6 | 7008 | static int |
b3444185 | 7009 | currently_stepping (struct thread_info *tp) |
a7212384 | 7010 | { |
8358c15c JK |
7011 | return ((tp->control.step_range_end |
7012 | && tp->control.step_resume_breakpoint == NULL) | |
7013 | || tp->control.trap_expected | |
af48d08f | 7014 | || tp->stepped_breakpoint |
8358c15c | 7015 | || bpstat_should_step ()); |
a7212384 UW |
7016 | } |
7017 | ||
b2175913 MS |
7018 | /* Inferior has stepped into a subroutine call with source code that |
7019 | we should not step over. Do step to the first line of code in | |
7020 | it. */ | |
c2c6d25f JM |
7021 | |
7022 | static void | |
568d6575 UW |
7023 | handle_step_into_function (struct gdbarch *gdbarch, |
7024 | struct execution_control_state *ecs) | |
c2c6d25f | 7025 | { |
43f3e411 | 7026 | struct compunit_symtab *cust; |
2afb61aa | 7027 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f | 7028 | |
7e324e48 GB |
7029 | fill_in_stop_func (gdbarch, ecs); |
7030 | ||
43f3e411 DE |
7031 | cust = find_pc_compunit_symtab (stop_pc); |
7032 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 7033 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 | 7034 | ecs->stop_func_start); |
c2c6d25f | 7035 | |
2afb61aa | 7036 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7037 | /* Use the step_resume_break to step until the end of the prologue, |
7038 | even if that involves jumps (as it seems to on the vax under | |
7039 | 4.2). */ | |
7040 | /* If the prologue ends in the middle of a source line, continue to | |
7041 | the end of that source line (if it is still within the function). | |
7042 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7043 | if (stop_func_sal.end |
7044 | && stop_func_sal.pc != ecs->stop_func_start | |
7045 | && stop_func_sal.end < ecs->stop_func_end) | |
7046 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7047 | |
2dbd5e30 KB |
7048 | /* Architectures which require breakpoint adjustment might not be able |
7049 | to place a breakpoint at the computed address. If so, the test | |
7050 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7051 | ecs->stop_func_start to an address at which a breakpoint may be | |
7052 | legitimately placed. | |
8fb3e588 | 7053 | |
2dbd5e30 KB |
7054 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7055 | made, GDB will enter an infinite loop when stepping through | |
7056 | optimized code consisting of VLIW instructions which contain | |
7057 | subinstructions corresponding to different source lines. On | |
7058 | FR-V, it's not permitted to place a breakpoint on any but the | |
7059 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7060 | set, GDB will adjust the breakpoint address to the beginning of | |
7061 | the VLIW instruction. Thus, we need to make the corresponding | |
7062 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7063 | |
568d6575 | 7064 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7065 | { |
7066 | ecs->stop_func_start | |
568d6575 | 7067 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7068 | ecs->stop_func_start); |
2dbd5e30 KB |
7069 | } |
7070 | ||
c2c6d25f JM |
7071 | if (ecs->stop_func_start == stop_pc) |
7072 | { | |
7073 | /* We are already there: stop now. */ | |
bdc36728 | 7074 | end_stepping_range (ecs); |
c2c6d25f JM |
7075 | return; |
7076 | } | |
7077 | else | |
7078 | { | |
7079 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 7080 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
7081 | sr_sal.pc = ecs->stop_func_start; |
7082 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7083 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7084 | |
c2c6d25f | 7085 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7086 | some machines the prologue is where the new fp value is |
7087 | established. */ | |
a6d9a66e | 7088 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7089 | |
7090 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7091 | ecs->event_thread->control.step_range_end |
7092 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7093 | } |
7094 | keep_going (ecs); | |
7095 | } | |
d4f3574e | 7096 | |
b2175913 MS |
7097 | /* Inferior has stepped backward into a subroutine call with source |
7098 | code that we should not step over. Do step to the beginning of the | |
7099 | last line of code in it. */ | |
7100 | ||
7101 | static void | |
568d6575 UW |
7102 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7103 | struct execution_control_state *ecs) | |
b2175913 | 7104 | { |
43f3e411 | 7105 | struct compunit_symtab *cust; |
167e4384 | 7106 | struct symtab_and_line stop_func_sal; |
b2175913 | 7107 | |
7e324e48 GB |
7108 | fill_in_stop_func (gdbarch, ecs); |
7109 | ||
43f3e411 DE |
7110 | cust = find_pc_compunit_symtab (stop_pc); |
7111 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 7112 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 MS |
7113 | ecs->stop_func_start); |
7114 | ||
7115 | stop_func_sal = find_pc_line (stop_pc, 0); | |
7116 | ||
7117 | /* OK, we're just going to keep stepping here. */ | |
7118 | if (stop_func_sal.pc == stop_pc) | |
7119 | { | |
7120 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7121 | end_stepping_range (ecs); |
b2175913 MS |
7122 | } |
7123 | else | |
7124 | { | |
7125 | /* Else just reset the step range and keep going. | |
7126 | No step-resume breakpoint, they don't work for | |
7127 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7128 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7129 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7130 | keep_going (ecs); |
7131 | } | |
7132 | return; | |
7133 | } | |
7134 | ||
d3169d93 | 7135 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7136 | This is used to both functions and to skip over code. */ |
7137 | ||
7138 | static void | |
2c03e5be PA |
7139 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7140 | struct symtab_and_line sr_sal, | |
7141 | struct frame_id sr_id, | |
7142 | enum bptype sr_type) | |
44cbf7b5 | 7143 | { |
611c83ae PA |
7144 | /* There should never be more than one step-resume or longjmp-resume |
7145 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7146 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7147 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7148 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
7149 | |
7150 | if (debug_infrun) | |
7151 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7152 | "infrun: inserting step-resume breakpoint at %s\n", |
7153 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7154 | |
8358c15c | 7155 | inferior_thread ()->control.step_resume_breakpoint |
2c03e5be PA |
7156 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type); |
7157 | } | |
7158 | ||
9da8c2a0 | 7159 | void |
2c03e5be PA |
7160 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7161 | struct symtab_and_line sr_sal, | |
7162 | struct frame_id sr_id) | |
7163 | { | |
7164 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7165 | sr_sal, sr_id, | |
7166 | bp_step_resume); | |
44cbf7b5 | 7167 | } |
7ce450bd | 7168 | |
2c03e5be PA |
7169 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7170 | This is used to skip a potential signal handler. | |
7ce450bd | 7171 | |
14e60db5 DJ |
7172 | This is called with the interrupted function's frame. The signal |
7173 | handler, when it returns, will resume the interrupted function at | |
7174 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7175 | |
7176 | static void | |
2c03e5be | 7177 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
7178 | { |
7179 | struct symtab_and_line sr_sal; | |
a6d9a66e | 7180 | struct gdbarch *gdbarch; |
d303a6c7 | 7181 | |
f4c1edd8 | 7182 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
7183 | init_sal (&sr_sal); /* initialize to zeros */ |
7184 | ||
a6d9a66e | 7185 | gdbarch = get_frame_arch (return_frame); |
568d6575 | 7186 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7187 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7188 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7189 | |
2c03e5be PA |
7190 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7191 | get_stack_frame_id (return_frame), | |
7192 | bp_hp_step_resume); | |
d303a6c7 AC |
7193 | } |
7194 | ||
2c03e5be PA |
7195 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7196 | is used to skip a function after stepping into it (for "next" or if | |
7197 | the called function has no debugging information). | |
14e60db5 DJ |
7198 | |
7199 | The current function has almost always been reached by single | |
7200 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7201 | current function, and the breakpoint will be set at the caller's | |
7202 | resume address. | |
7203 | ||
7204 | This is a separate function rather than reusing | |
2c03e5be | 7205 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7206 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7207 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7208 | |
7209 | static void | |
7210 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7211 | { | |
7212 | struct symtab_and_line sr_sal; | |
a6d9a66e | 7213 | struct gdbarch *gdbarch; |
14e60db5 DJ |
7214 | |
7215 | /* We shouldn't have gotten here if we don't know where the call site | |
7216 | is. */ | |
c7ce8faa | 7217 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 DJ |
7218 | |
7219 | init_sal (&sr_sal); /* initialize to zeros */ | |
7220 | ||
a6d9a66e | 7221 | gdbarch = frame_unwind_caller_arch (next_frame); |
c7ce8faa DJ |
7222 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7223 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7224 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7225 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7226 | |
a6d9a66e | 7227 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7228 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7229 | } |
7230 | ||
611c83ae PA |
7231 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7232 | new breakpoint at the target of a jmp_buf. The handling of | |
7233 | longjmp-resume uses the same mechanisms used for handling | |
7234 | "step-resume" breakpoints. */ | |
7235 | ||
7236 | static void | |
a6d9a66e | 7237 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7238 | { |
e81a37f7 TT |
7239 | /* There should never be more than one longjmp-resume breakpoint per |
7240 | thread, so we should never be setting a new | |
611c83ae | 7241 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7242 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
7243 | |
7244 | if (debug_infrun) | |
7245 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7246 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
7247 | paddress (gdbarch, pc)); | |
611c83ae | 7248 | |
e81a37f7 | 7249 | inferior_thread ()->control.exception_resume_breakpoint = |
a6d9a66e | 7250 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); |
611c83ae PA |
7251 | } |
7252 | ||
186c406b TT |
7253 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7254 | the exception. The block B is the block of the unwinder debug hook | |
7255 | function. FRAME is the frame corresponding to the call to this | |
7256 | function. SYM is the symbol of the function argument holding the | |
7257 | target PC of the exception. */ | |
7258 | ||
7259 | static void | |
7260 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7261 | const struct block *b, |
186c406b TT |
7262 | struct frame_info *frame, |
7263 | struct symbol *sym) | |
7264 | { | |
492d29ea | 7265 | TRY |
186c406b | 7266 | { |
63e43d3a | 7267 | struct block_symbol vsym; |
186c406b TT |
7268 | struct value *value; |
7269 | CORE_ADDR handler; | |
7270 | struct breakpoint *bp; | |
7271 | ||
63e43d3a PMR |
7272 | vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL); |
7273 | value = read_var_value (vsym.symbol, vsym.block, frame); | |
186c406b TT |
7274 | /* If the value was optimized out, revert to the old behavior. */ |
7275 | if (! value_optimized_out (value)) | |
7276 | { | |
7277 | handler = value_as_address (value); | |
7278 | ||
7279 | if (debug_infrun) | |
7280 | fprintf_unfiltered (gdb_stdlog, | |
7281 | "infrun: exception resume at %lx\n", | |
7282 | (unsigned long) handler); | |
7283 | ||
7284 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7285 | handler, bp_exception_resume); | |
c70a6932 JK |
7286 | |
7287 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7288 | frame = NULL; | |
7289 | ||
186c406b TT |
7290 | bp->thread = tp->num; |
7291 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
7292 | } | |
7293 | } | |
492d29ea PA |
7294 | CATCH (e, RETURN_MASK_ERROR) |
7295 | { | |
7296 | /* We want to ignore errors here. */ | |
7297 | } | |
7298 | END_CATCH | |
186c406b TT |
7299 | } |
7300 | ||
28106bc2 SDJ |
7301 | /* A helper for check_exception_resume that sets an |
7302 | exception-breakpoint based on a SystemTap probe. */ | |
7303 | ||
7304 | static void | |
7305 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7306 | const struct bound_probe *probe, |
28106bc2 SDJ |
7307 | struct frame_info *frame) |
7308 | { | |
7309 | struct value *arg_value; | |
7310 | CORE_ADDR handler; | |
7311 | struct breakpoint *bp; | |
7312 | ||
7313 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7314 | if (!arg_value) | |
7315 | return; | |
7316 | ||
7317 | handler = value_as_address (arg_value); | |
7318 | ||
7319 | if (debug_infrun) | |
7320 | fprintf_unfiltered (gdb_stdlog, | |
7321 | "infrun: exception resume at %s\n", | |
6bac7473 | 7322 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
7323 | handler)); |
7324 | ||
7325 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7326 | handler, bp_exception_resume); | |
7327 | bp->thread = tp->num; | |
7328 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
7329 | } | |
7330 | ||
186c406b TT |
7331 | /* This is called when an exception has been intercepted. Check to |
7332 | see whether the exception's destination is of interest, and if so, | |
7333 | set an exception resume breakpoint there. */ | |
7334 | ||
7335 | static void | |
7336 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7337 | struct frame_info *frame) |
186c406b | 7338 | { |
729662a5 | 7339 | struct bound_probe probe; |
28106bc2 SDJ |
7340 | struct symbol *func; |
7341 | ||
7342 | /* First see if this exception unwinding breakpoint was set via a | |
7343 | SystemTap probe point. If so, the probe has two arguments: the | |
7344 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7345 | set a breakpoint there. */ | |
6bac7473 | 7346 | probe = find_probe_by_pc (get_frame_pc (frame)); |
729662a5 | 7347 | if (probe.probe) |
28106bc2 | 7348 | { |
729662a5 | 7349 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7350 | return; |
7351 | } | |
7352 | ||
7353 | func = get_frame_function (frame); | |
7354 | if (!func) | |
7355 | return; | |
186c406b | 7356 | |
492d29ea | 7357 | TRY |
186c406b | 7358 | { |
3977b71f | 7359 | const struct block *b; |
8157b174 | 7360 | struct block_iterator iter; |
186c406b TT |
7361 | struct symbol *sym; |
7362 | int argno = 0; | |
7363 | ||
7364 | /* The exception breakpoint is a thread-specific breakpoint on | |
7365 | the unwinder's debug hook, declared as: | |
7366 | ||
7367 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7368 | ||
7369 | The CFA argument indicates the frame to which control is | |
7370 | about to be transferred. HANDLER is the destination PC. | |
7371 | ||
7372 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7373 | This is not extremely efficient but it avoids issues in gdb | |
7374 | with computing the DWARF CFA, and it also works even in weird | |
7375 | cases such as throwing an exception from inside a signal | |
7376 | handler. */ | |
7377 | ||
7378 | b = SYMBOL_BLOCK_VALUE (func); | |
7379 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7380 | { | |
7381 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7382 | continue; | |
7383 | ||
7384 | if (argno == 0) | |
7385 | ++argno; | |
7386 | else | |
7387 | { | |
7388 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7389 | b, frame, sym); | |
7390 | break; | |
7391 | } | |
7392 | } | |
7393 | } | |
492d29ea PA |
7394 | CATCH (e, RETURN_MASK_ERROR) |
7395 | { | |
7396 | } | |
7397 | END_CATCH | |
186c406b TT |
7398 | } |
7399 | ||
104c1213 | 7400 | static void |
22bcd14b | 7401 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7402 | { |
527159b7 | 7403 | if (debug_infrun) |
22bcd14b | 7404 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 7405 | |
31e77af2 PA |
7406 | clear_step_over_info (); |
7407 | ||
cd0fc7c3 SS |
7408 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7409 | ecs->wait_some_more = 0; | |
fbea99ea PA |
7410 | |
7411 | /* If all-stop, but the target is always in non-stop mode, stop all | |
7412 | threads now that we're presenting the stop to the user. */ | |
7413 | if (!non_stop && target_is_non_stop_p ()) | |
7414 | stop_all_threads (); | |
cd0fc7c3 SS |
7415 | } |
7416 | ||
4d9d9d04 PA |
7417 | /* Like keep_going, but passes the signal to the inferior, even if the |
7418 | signal is set to nopass. */ | |
d4f3574e SS |
7419 | |
7420 | static void | |
4d9d9d04 | 7421 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7422 | { |
c4dbc9af PA |
7423 | /* Make sure normal_stop is called if we get a QUIT handled before |
7424 | reaching resume. */ | |
7425 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
7426 | ||
4d9d9d04 | 7427 | gdb_assert (ptid_equal (ecs->event_thread->ptid, inferior_ptid)); |
372316f1 | 7428 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7429 | |
d4f3574e | 7430 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
7431 | ecs->event_thread->prev_pc |
7432 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 7433 | |
4d9d9d04 | 7434 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7435 | { |
4d9d9d04 PA |
7436 | struct thread_info *tp = ecs->event_thread; |
7437 | ||
7438 | if (debug_infrun) | |
7439 | fprintf_unfiltered (gdb_stdlog, | |
7440 | "infrun: %s has trap_expected set, " | |
7441 | "resuming to collect trap\n", | |
7442 | target_pid_to_str (tp->ptid)); | |
7443 | ||
a9ba6bae PA |
7444 | /* We haven't yet gotten our trap, and either: intercepted a |
7445 | non-signal event (e.g., a fork); or took a signal which we | |
7446 | are supposed to pass through to the inferior. Simply | |
7447 | continue. */ | |
c4dbc9af | 7448 | discard_cleanups (old_cleanups); |
64ce06e4 | 7449 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7450 | } |
372316f1 PA |
7451 | else if (step_over_info_valid_p ()) |
7452 | { | |
7453 | /* Another thread is stepping over a breakpoint in-line. If | |
7454 | this thread needs a step-over too, queue the request. In | |
7455 | either case, this resume must be deferred for later. */ | |
7456 | struct thread_info *tp = ecs->event_thread; | |
7457 | ||
7458 | if (ecs->hit_singlestep_breakpoint | |
7459 | || thread_still_needs_step_over (tp)) | |
7460 | { | |
7461 | if (debug_infrun) | |
7462 | fprintf_unfiltered (gdb_stdlog, | |
7463 | "infrun: step-over already in progress: " | |
7464 | "step-over for %s deferred\n", | |
7465 | target_pid_to_str (tp->ptid)); | |
7466 | thread_step_over_chain_enqueue (tp); | |
7467 | } | |
7468 | else | |
7469 | { | |
7470 | if (debug_infrun) | |
7471 | fprintf_unfiltered (gdb_stdlog, | |
7472 | "infrun: step-over in progress: " | |
7473 | "resume of %s deferred\n", | |
7474 | target_pid_to_str (tp->ptid)); | |
7475 | } | |
7476 | ||
7477 | discard_cleanups (old_cleanups); | |
7478 | } | |
d4f3574e SS |
7479 | else |
7480 | { | |
31e77af2 | 7481 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7482 | int remove_bp; |
7483 | int remove_wps; | |
6c4cfb24 | 7484 | enum step_over_what step_what; |
31e77af2 | 7485 | |
d4f3574e | 7486 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7487 | anyway (if we got a signal, the user asked it be passed to |
7488 | the child) | |
7489 | -- or -- | |
7490 | We got our expected trap, but decided we should resume from | |
7491 | it. | |
d4f3574e | 7492 | |
a9ba6bae | 7493 | We're going to run this baby now! |
d4f3574e | 7494 | |
c36b740a VP |
7495 | Note that insert_breakpoints won't try to re-insert |
7496 | already inserted breakpoints. Therefore, we don't | |
7497 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7498 | |
31e77af2 PA |
7499 | /* If we need to step over a breakpoint, and we're not using |
7500 | displaced stepping to do so, insert all breakpoints | |
7501 | (watchpoints, etc.) but the one we're stepping over, step one | |
7502 | instruction, and then re-insert the breakpoint when that step | |
7503 | is finished. */ | |
963f9c80 | 7504 | |
6c4cfb24 PA |
7505 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7506 | ||
963f9c80 | 7507 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7508 | || (step_what & STEP_OVER_BREAKPOINT)); |
7509 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7510 | |
cb71640d PA |
7511 | /* We can't use displaced stepping if we need to step past a |
7512 | watchpoint. The instruction copied to the scratch pad would | |
7513 | still trigger the watchpoint. */ | |
7514 | if (remove_bp | |
3fc8eb30 | 7515 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7516 | { |
31e77af2 | 7517 | set_step_over_info (get_regcache_aspace (regcache), |
963f9c80 | 7518 | regcache_read_pc (regcache), remove_wps); |
45e8c884 | 7519 | } |
963f9c80 PA |
7520 | else if (remove_wps) |
7521 | set_step_over_info (NULL, 0, remove_wps); | |
372316f1 PA |
7522 | |
7523 | /* If we now need to do an in-line step-over, we need to stop | |
7524 | all other threads. Note this must be done before | |
7525 | insert_breakpoints below, because that removes the breakpoint | |
7526 | we're about to step over, otherwise other threads could miss | |
7527 | it. */ | |
fbea99ea | 7528 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7529 | stop_all_threads (); |
abbb1732 | 7530 | |
31e77af2 | 7531 | /* Stop stepping if inserting breakpoints fails. */ |
492d29ea | 7532 | TRY |
31e77af2 PA |
7533 | { |
7534 | insert_breakpoints (); | |
7535 | } | |
492d29ea | 7536 | CATCH (e, RETURN_MASK_ERROR) |
31e77af2 PA |
7537 | { |
7538 | exception_print (gdb_stderr, e); | |
22bcd14b | 7539 | stop_waiting (ecs); |
de1fe8c8 | 7540 | discard_cleanups (old_cleanups); |
31e77af2 | 7541 | return; |
d4f3574e | 7542 | } |
492d29ea | 7543 | END_CATCH |
d4f3574e | 7544 | |
963f9c80 | 7545 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7546 | |
c4dbc9af | 7547 | discard_cleanups (old_cleanups); |
64ce06e4 | 7548 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7549 | } |
7550 | ||
488f131b | 7551 | prepare_to_wait (ecs); |
d4f3574e SS |
7552 | } |
7553 | ||
4d9d9d04 PA |
7554 | /* Called when we should continue running the inferior, because the |
7555 | current event doesn't cause a user visible stop. This does the | |
7556 | resuming part; waiting for the next event is done elsewhere. */ | |
7557 | ||
7558 | static void | |
7559 | keep_going (struct execution_control_state *ecs) | |
7560 | { | |
7561 | if (ecs->event_thread->control.trap_expected | |
7562 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7563 | ecs->event_thread->control.trap_expected = 0; | |
7564 | ||
7565 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7566 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7567 | keep_going_pass_signal (ecs); | |
7568 | } | |
7569 | ||
104c1213 JM |
7570 | /* This function normally comes after a resume, before |
7571 | handle_inferior_event exits. It takes care of any last bits of | |
7572 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7573 | |
104c1213 JM |
7574 | static void |
7575 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7576 | { |
527159b7 | 7577 | if (debug_infrun) |
8a9de0e4 | 7578 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 7579 | |
104c1213 | 7580 | ecs->wait_some_more = 1; |
0b333c5e PA |
7581 | |
7582 | if (!target_is_async_p ()) | |
7583 | mark_infrun_async_event_handler (); | |
c906108c | 7584 | } |
11cf8741 | 7585 | |
fd664c91 | 7586 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7587 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7588 | |
7589 | static void | |
bdc36728 | 7590 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7591 | { |
bdc36728 | 7592 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7593 | stop_waiting (ecs); |
fd664c91 PA |
7594 | } |
7595 | ||
33d62d64 JK |
7596 | /* Several print_*_reason functions to print why the inferior has stopped. |
7597 | We always print something when the inferior exits, or receives a signal. | |
7598 | The rest of the cases are dealt with later on in normal_stop and | |
7599 | print_it_typical. Ideally there should be a call to one of these | |
7600 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7601 | stop_waiting is called. |
33d62d64 | 7602 | |
fd664c91 PA |
7603 | Note that we don't call these directly, instead we delegate that to |
7604 | the interpreters, through observers. Interpreters then call these | |
7605 | with whatever uiout is right. */ | |
33d62d64 | 7606 | |
fd664c91 PA |
7607 | void |
7608 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7609 | { |
fd664c91 | 7610 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7611 | |
fd664c91 PA |
7612 | if (ui_out_is_mi_like_p (uiout)) |
7613 | { | |
7614 | ui_out_field_string (uiout, "reason", | |
7615 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
7616 | } | |
7617 | } | |
33d62d64 | 7618 | |
fd664c91 PA |
7619 | void |
7620 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7621 | { |
33d62d64 JK |
7622 | annotate_signalled (); |
7623 | if (ui_out_is_mi_like_p (uiout)) | |
7624 | ui_out_field_string | |
7625 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7626 | ui_out_text (uiout, "\nProgram terminated with signal "); | |
7627 | annotate_signal_name (); | |
7628 | ui_out_field_string (uiout, "signal-name", | |
2ea28649 | 7629 | gdb_signal_to_name (siggnal)); |
33d62d64 JK |
7630 | annotate_signal_name_end (); |
7631 | ui_out_text (uiout, ", "); | |
7632 | annotate_signal_string (); | |
7633 | ui_out_field_string (uiout, "signal-meaning", | |
2ea28649 | 7634 | gdb_signal_to_string (siggnal)); |
33d62d64 JK |
7635 | annotate_signal_string_end (); |
7636 | ui_out_text (uiout, ".\n"); | |
7637 | ui_out_text (uiout, "The program no longer exists.\n"); | |
7638 | } | |
7639 | ||
fd664c91 PA |
7640 | void |
7641 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7642 | { |
fda326dd TT |
7643 | struct inferior *inf = current_inferior (); |
7644 | const char *pidstr = target_pid_to_str (pid_to_ptid (inf->pid)); | |
7645 | ||
33d62d64 JK |
7646 | annotate_exited (exitstatus); |
7647 | if (exitstatus) | |
7648 | { | |
7649 | if (ui_out_is_mi_like_p (uiout)) | |
7650 | ui_out_field_string (uiout, "reason", | |
7651 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
fda326dd TT |
7652 | ui_out_text (uiout, "[Inferior "); |
7653 | ui_out_text (uiout, plongest (inf->num)); | |
7654 | ui_out_text (uiout, " ("); | |
7655 | ui_out_text (uiout, pidstr); | |
7656 | ui_out_text (uiout, ") exited with code "); | |
33d62d64 | 7657 | ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) exitstatus); |
fda326dd | 7658 | ui_out_text (uiout, "]\n"); |
33d62d64 JK |
7659 | } |
7660 | else | |
11cf8741 | 7661 | { |
9dc5e2a9 | 7662 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f | 7663 | ui_out_field_string |
33d62d64 | 7664 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); |
fda326dd TT |
7665 | ui_out_text (uiout, "[Inferior "); |
7666 | ui_out_text (uiout, plongest (inf->num)); | |
7667 | ui_out_text (uiout, " ("); | |
7668 | ui_out_text (uiout, pidstr); | |
7669 | ui_out_text (uiout, ") exited normally]\n"); | |
33d62d64 | 7670 | } |
33d62d64 JK |
7671 | } |
7672 | ||
fd664c91 PA |
7673 | void |
7674 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 JK |
7675 | { |
7676 | annotate_signal (); | |
7677 | ||
a493e3e2 | 7678 | if (siggnal == GDB_SIGNAL_0 && !ui_out_is_mi_like_p (uiout)) |
33d62d64 JK |
7679 | { |
7680 | struct thread_info *t = inferior_thread (); | |
7681 | ||
7682 | ui_out_text (uiout, "\n["); | |
7683 | ui_out_field_string (uiout, "thread-name", | |
7684 | target_pid_to_str (t->ptid)); | |
7685 | ui_out_field_fmt (uiout, "thread-id", "] #%d", t->num); | |
7686 | ui_out_text (uiout, " stopped"); | |
7687 | } | |
7688 | else | |
7689 | { | |
7690 | ui_out_text (uiout, "\nProgram received signal "); | |
8b93c638 | 7691 | annotate_signal_name (); |
33d62d64 JK |
7692 | if (ui_out_is_mi_like_p (uiout)) |
7693 | ui_out_field_string | |
7694 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b | 7695 | ui_out_field_string (uiout, "signal-name", |
2ea28649 | 7696 | gdb_signal_to_name (siggnal)); |
8b93c638 JM |
7697 | annotate_signal_name_end (); |
7698 | ui_out_text (uiout, ", "); | |
7699 | annotate_signal_string (); | |
488f131b | 7700 | ui_out_field_string (uiout, "signal-meaning", |
2ea28649 | 7701 | gdb_signal_to_string (siggnal)); |
8b93c638 | 7702 | annotate_signal_string_end (); |
33d62d64 JK |
7703 | } |
7704 | ui_out_text (uiout, ".\n"); | |
7705 | } | |
252fbfc8 | 7706 | |
fd664c91 PA |
7707 | void |
7708 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 7709 | { |
fd664c91 | 7710 | ui_out_text (uiout, "\nNo more reverse-execution history.\n"); |
11cf8741 | 7711 | } |
43ff13b4 | 7712 | |
0c7e1a46 PA |
7713 | /* Print current location without a level number, if we have changed |
7714 | functions or hit a breakpoint. Print source line if we have one. | |
7715 | bpstat_print contains the logic deciding in detail what to print, | |
7716 | based on the event(s) that just occurred. */ | |
7717 | ||
243a9253 PA |
7718 | static void |
7719 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
7720 | { |
7721 | int bpstat_ret; | |
f486487f | 7722 | enum print_what source_flag; |
0c7e1a46 PA |
7723 | int do_frame_printing = 1; |
7724 | struct thread_info *tp = inferior_thread (); | |
7725 | ||
7726 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
7727 | switch (bpstat_ret) | |
7728 | { | |
7729 | case PRINT_UNKNOWN: | |
7730 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
7731 | should) carry around the function and does (or should) use | |
7732 | that when doing a frame comparison. */ | |
7733 | if (tp->control.stop_step | |
7734 | && frame_id_eq (tp->control.step_frame_id, | |
7735 | get_frame_id (get_current_frame ())) | |
885eeb5b | 7736 | && tp->control.step_start_function == find_pc_function (stop_pc)) |
0c7e1a46 PA |
7737 | { |
7738 | /* Finished step, just print source line. */ | |
7739 | source_flag = SRC_LINE; | |
7740 | } | |
7741 | else | |
7742 | { | |
7743 | /* Print location and source line. */ | |
7744 | source_flag = SRC_AND_LOC; | |
7745 | } | |
7746 | break; | |
7747 | case PRINT_SRC_AND_LOC: | |
7748 | /* Print location and source line. */ | |
7749 | source_flag = SRC_AND_LOC; | |
7750 | break; | |
7751 | case PRINT_SRC_ONLY: | |
7752 | source_flag = SRC_LINE; | |
7753 | break; | |
7754 | case PRINT_NOTHING: | |
7755 | /* Something bogus. */ | |
7756 | source_flag = SRC_LINE; | |
7757 | do_frame_printing = 0; | |
7758 | break; | |
7759 | default: | |
7760 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
7761 | } | |
7762 | ||
7763 | /* The behavior of this routine with respect to the source | |
7764 | flag is: | |
7765 | SRC_LINE: Print only source line | |
7766 | LOCATION: Print only location | |
7767 | SRC_AND_LOC: Print location and source line. */ | |
7768 | if (do_frame_printing) | |
7769 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
7770 | } |
7771 | ||
7772 | /* Cleanup that restores a previous current uiout. */ | |
7773 | ||
7774 | static void | |
7775 | restore_current_uiout_cleanup (void *arg) | |
7776 | { | |
7777 | struct ui_out *saved_uiout = arg; | |
7778 | ||
7779 | current_uiout = saved_uiout; | |
7780 | } | |
7781 | ||
7782 | /* See infrun.h. */ | |
7783 | ||
7784 | void | |
7785 | print_stop_event (struct ui_out *uiout) | |
7786 | { | |
7787 | struct cleanup *old_chain; | |
7788 | struct target_waitstatus last; | |
7789 | ptid_t last_ptid; | |
7790 | struct thread_info *tp; | |
7791 | ||
7792 | get_last_target_status (&last_ptid, &last); | |
7793 | ||
7794 | old_chain = make_cleanup (restore_current_uiout_cleanup, current_uiout); | |
7795 | current_uiout = uiout; | |
7796 | ||
7797 | print_stop_location (&last); | |
0c7e1a46 PA |
7798 | |
7799 | /* Display the auto-display expressions. */ | |
7800 | do_displays (); | |
243a9253 PA |
7801 | |
7802 | do_cleanups (old_chain); | |
7803 | ||
7804 | tp = inferior_thread (); | |
7805 | if (tp->thread_fsm != NULL | |
7806 | && thread_fsm_finished_p (tp->thread_fsm)) | |
7807 | { | |
7808 | struct return_value_info *rv; | |
7809 | ||
7810 | rv = thread_fsm_return_value (tp->thread_fsm); | |
7811 | if (rv != NULL) | |
7812 | print_return_value (uiout, rv); | |
7813 | } | |
0c7e1a46 PA |
7814 | } |
7815 | ||
388a7084 PA |
7816 | /* See infrun.h. */ |
7817 | ||
7818 | void | |
7819 | maybe_remove_breakpoints (void) | |
7820 | { | |
7821 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
7822 | { | |
7823 | if (remove_breakpoints ()) | |
7824 | { | |
7825 | target_terminal_ours_for_output (); | |
7826 | printf_filtered (_("Cannot remove breakpoints because " | |
7827 | "program is no longer writable.\nFurther " | |
7828 | "execution is probably impossible.\n")); | |
7829 | } | |
7830 | } | |
7831 | } | |
7832 | ||
c906108c SS |
7833 | /* Here to return control to GDB when the inferior stops for real. |
7834 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
7835 | ||
7836 | STOP_PRINT_FRAME nonzero means print the executing frame | |
7837 | (pc, function, args, file, line number and line text). | |
7838 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
7839 | attempting to insert breakpoints. */ | |
7840 | ||
7841 | void | |
96baa820 | 7842 | normal_stop (void) |
c906108c | 7843 | { |
73b65bb0 DJ |
7844 | struct target_waitstatus last; |
7845 | ptid_t last_ptid; | |
29f49a6a | 7846 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
e1316e60 | 7847 | ptid_t pid_ptid; |
73b65bb0 DJ |
7848 | |
7849 | get_last_target_status (&last_ptid, &last); | |
7850 | ||
29f49a6a PA |
7851 | /* If an exception is thrown from this point on, make sure to |
7852 | propagate GDB's knowledge of the executing state to the | |
7853 | frontend/user running state. A QUIT is an easy exception to see | |
7854 | here, so do this before any filtered output. */ | |
c35b1492 PA |
7855 | if (!non_stop) |
7856 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
e1316e60 PA |
7857 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
7858 | || last.kind == TARGET_WAITKIND_EXITED) | |
7859 | { | |
7860 | /* On some targets, we may still have live threads in the | |
7861 | inferior when we get a process exit event. E.g., for | |
7862 | "checkpoint", when the current checkpoint/fork exits, | |
7863 | linux-fork.c automatically switches to another fork from | |
7864 | within target_mourn_inferior. */ | |
7865 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
7866 | { | |
7867 | pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
7868 | make_cleanup (finish_thread_state_cleanup, &pid_ptid); | |
7869 | } | |
7870 | } | |
7871 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c35b1492 | 7872 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); |
29f49a6a | 7873 | |
b57bacec PA |
7874 | /* As we're presenting a stop, and potentially removing breakpoints, |
7875 | update the thread list so we can tell whether there are threads | |
7876 | running on the target. With target remote, for example, we can | |
7877 | only learn about new threads when we explicitly update the thread | |
7878 | list. Do this before notifying the interpreters about signal | |
7879 | stops, end of stepping ranges, etc., so that the "new thread" | |
7880 | output is emitted before e.g., "Program received signal FOO", | |
7881 | instead of after. */ | |
7882 | update_thread_list (); | |
7883 | ||
7884 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
7885 | observer_notify_signal_received (inferior_thread ()->suspend.stop_signal); | |
7886 | ||
c906108c SS |
7887 | /* As with the notification of thread events, we want to delay |
7888 | notifying the user that we've switched thread context until | |
7889 | the inferior actually stops. | |
7890 | ||
73b65bb0 DJ |
7891 | There's no point in saying anything if the inferior has exited. |
7892 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
7893 | "received a signal". |
7894 | ||
7895 | Also skip saying anything in non-stop mode. In that mode, as we | |
7896 | don't want GDB to switch threads behind the user's back, to avoid | |
7897 | races where the user is typing a command to apply to thread x, | |
7898 | but GDB switches to thread y before the user finishes entering | |
7899 | the command, fetch_inferior_event installs a cleanup to restore | |
7900 | the current thread back to the thread the user had selected right | |
7901 | after this event is handled, so we're not really switching, only | |
7902 | informing of a stop. */ | |
4f8d22e3 PA |
7903 | if (!non_stop |
7904 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
7905 | && target_has_execution |
7906 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
7907 | && last.kind != TARGET_WAITKIND_EXITED |
7908 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c SS |
7909 | { |
7910 | target_terminal_ours_for_output (); | |
a3f17187 | 7911 | printf_filtered (_("[Switching to %s]\n"), |
c95310c6 | 7912 | target_pid_to_str (inferior_ptid)); |
b8fa951a | 7913 | annotate_thread_changed (); |
39f77062 | 7914 | previous_inferior_ptid = inferior_ptid; |
c906108c | 7915 | } |
c906108c | 7916 | |
0e5bf2a8 PA |
7917 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
7918 | { | |
7919 | gdb_assert (sync_execution || !target_can_async_p ()); | |
7920 | ||
7921 | target_terminal_ours_for_output (); | |
7922 | printf_filtered (_("No unwaited-for children left.\n")); | |
7923 | } | |
7924 | ||
b57bacec | 7925 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 7926 | maybe_remove_breakpoints (); |
c906108c | 7927 | |
c906108c SS |
7928 | /* If an auto-display called a function and that got a signal, |
7929 | delete that auto-display to avoid an infinite recursion. */ | |
7930 | ||
7931 | if (stopped_by_random_signal) | |
7932 | disable_current_display (); | |
7933 | ||
c906108c | 7934 | target_terminal_ours (); |
0f641c01 | 7935 | async_enable_stdin (); |
c906108c | 7936 | |
388a7084 PA |
7937 | /* Let the user/frontend see the threads as stopped. */ |
7938 | do_cleanups (old_chain); | |
7939 | ||
7940 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
7941 | and current location is based on that. Handle the case where the | |
7942 | dummy call is returning after being stopped. E.g. the dummy call | |
7943 | previously hit a breakpoint. (If the dummy call returns | |
7944 | normally, we won't reach here.) Do this before the stop hook is | |
7945 | run, so that it doesn't get to see the temporary dummy frame, | |
7946 | which is not where we'll present the stop. */ | |
7947 | if (has_stack_frames ()) | |
7948 | { | |
7949 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
7950 | { | |
7951 | /* Pop the empty frame that contains the stack dummy. This | |
7952 | also restores inferior state prior to the call (struct | |
7953 | infcall_suspend_state). */ | |
7954 | struct frame_info *frame = get_current_frame (); | |
7955 | ||
7956 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
7957 | frame_pop (frame); | |
7958 | /* frame_pop calls reinit_frame_cache as the last thing it | |
7959 | does which means there's now no selected frame. */ | |
7960 | } | |
7961 | ||
7962 | select_frame (get_current_frame ()); | |
7963 | ||
7964 | /* Set the current source location. */ | |
7965 | set_current_sal_from_frame (get_current_frame ()); | |
7966 | } | |
dd7e2d2b PA |
7967 | |
7968 | /* Look up the hook_stop and run it (CLI internally handles problem | |
7969 | of stop_command's pre-hook not existing). */ | |
7970 | if (stop_command) | |
7971 | catch_errors (hook_stop_stub, stop_command, | |
7972 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
7973 | ||
388a7084 PA |
7974 | /* Notify observers about the stop. This is where the interpreters |
7975 | print the stop event. */ | |
7976 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
7977 | observer_notify_normal_stop (inferior_thread ()->control.stop_bpstat, | |
7978 | stop_print_frame); | |
7979 | else | |
7980 | observer_notify_normal_stop (NULL, stop_print_frame); | |
347bddb7 | 7981 | |
243a9253 PA |
7982 | annotate_stopped (); |
7983 | ||
48844aa6 PA |
7984 | if (target_has_execution) |
7985 | { | |
7986 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
7987 | && last.kind != TARGET_WAITKIND_EXITED) | |
7988 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
7989 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 7990 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 7991 | } |
6c95b8df PA |
7992 | |
7993 | /* Try to get rid of automatically added inferiors that are no | |
7994 | longer needed. Keeping those around slows down things linearly. | |
7995 | Note that this never removes the current inferior. */ | |
7996 | prune_inferiors (); | |
c906108c SS |
7997 | } |
7998 | ||
7999 | static int | |
96baa820 | 8000 | hook_stop_stub (void *cmd) |
c906108c | 8001 | { |
5913bcb0 | 8002 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
8003 | return (0); |
8004 | } | |
8005 | \f | |
c5aa993b | 8006 | int |
96baa820 | 8007 | signal_stop_state (int signo) |
c906108c | 8008 | { |
d6b48e9c | 8009 | return signal_stop[signo]; |
c906108c SS |
8010 | } |
8011 | ||
c5aa993b | 8012 | int |
96baa820 | 8013 | signal_print_state (int signo) |
c906108c SS |
8014 | { |
8015 | return signal_print[signo]; | |
8016 | } | |
8017 | ||
c5aa993b | 8018 | int |
96baa820 | 8019 | signal_pass_state (int signo) |
c906108c SS |
8020 | { |
8021 | return signal_program[signo]; | |
8022 | } | |
8023 | ||
2455069d UW |
8024 | static void |
8025 | signal_cache_update (int signo) | |
8026 | { | |
8027 | if (signo == -1) | |
8028 | { | |
a493e3e2 | 8029 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8030 | signal_cache_update (signo); |
8031 | ||
8032 | return; | |
8033 | } | |
8034 | ||
8035 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8036 | && signal_print[signo] == 0 | |
ab04a2af TT |
8037 | && signal_program[signo] == 1 |
8038 | && signal_catch[signo] == 0); | |
2455069d UW |
8039 | } |
8040 | ||
488f131b | 8041 | int |
7bda5e4a | 8042 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8043 | { |
8044 | int ret = signal_stop[signo]; | |
abbb1732 | 8045 | |
d4f3574e | 8046 | signal_stop[signo] = state; |
2455069d | 8047 | signal_cache_update (signo); |
d4f3574e SS |
8048 | return ret; |
8049 | } | |
8050 | ||
488f131b | 8051 | int |
7bda5e4a | 8052 | signal_print_update (int signo, int state) |
d4f3574e SS |
8053 | { |
8054 | int ret = signal_print[signo]; | |
abbb1732 | 8055 | |
d4f3574e | 8056 | signal_print[signo] = state; |
2455069d | 8057 | signal_cache_update (signo); |
d4f3574e SS |
8058 | return ret; |
8059 | } | |
8060 | ||
488f131b | 8061 | int |
7bda5e4a | 8062 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8063 | { |
8064 | int ret = signal_program[signo]; | |
abbb1732 | 8065 | |
d4f3574e | 8066 | signal_program[signo] = state; |
2455069d | 8067 | signal_cache_update (signo); |
d4f3574e SS |
8068 | return ret; |
8069 | } | |
8070 | ||
ab04a2af TT |
8071 | /* Update the global 'signal_catch' from INFO and notify the |
8072 | target. */ | |
8073 | ||
8074 | void | |
8075 | signal_catch_update (const unsigned int *info) | |
8076 | { | |
8077 | int i; | |
8078 | ||
8079 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8080 | signal_catch[i] = info[i] > 0; | |
8081 | signal_cache_update (-1); | |
8082 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
8083 | } | |
8084 | ||
c906108c | 8085 | static void |
96baa820 | 8086 | sig_print_header (void) |
c906108c | 8087 | { |
3e43a32a MS |
8088 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8089 | "to program\tDescription\n")); | |
c906108c SS |
8090 | } |
8091 | ||
8092 | static void | |
2ea28649 | 8093 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8094 | { |
2ea28649 | 8095 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8096 | int name_padding = 13 - strlen (name); |
96baa820 | 8097 | |
c906108c SS |
8098 | if (name_padding <= 0) |
8099 | name_padding = 0; | |
8100 | ||
8101 | printf_filtered ("%s", name); | |
488f131b | 8102 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8103 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8104 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8105 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8106 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8107 | } |
8108 | ||
8109 | /* Specify how various signals in the inferior should be handled. */ | |
8110 | ||
8111 | static void | |
96baa820 | 8112 | handle_command (char *args, int from_tty) |
c906108c SS |
8113 | { |
8114 | char **argv; | |
8115 | int digits, wordlen; | |
8116 | int sigfirst, signum, siglast; | |
2ea28649 | 8117 | enum gdb_signal oursig; |
c906108c SS |
8118 | int allsigs; |
8119 | int nsigs; | |
8120 | unsigned char *sigs; | |
8121 | struct cleanup *old_chain; | |
8122 | ||
8123 | if (args == NULL) | |
8124 | { | |
e2e0b3e5 | 8125 | error_no_arg (_("signal to handle")); |
c906108c SS |
8126 | } |
8127 | ||
1777feb0 | 8128 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8129 | |
a493e3e2 | 8130 | nsigs = (int) GDB_SIGNAL_LAST; |
c906108c SS |
8131 | sigs = (unsigned char *) alloca (nsigs); |
8132 | memset (sigs, 0, nsigs); | |
8133 | ||
1777feb0 | 8134 | /* Break the command line up into args. */ |
c906108c | 8135 | |
d1a41061 | 8136 | argv = gdb_buildargv (args); |
7a292a7a | 8137 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
8138 | |
8139 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8140 | actions. Signal numbers and signal names may be interspersed with | |
8141 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8142 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c SS |
8143 | |
8144 | while (*argv != NULL) | |
8145 | { | |
8146 | wordlen = strlen (*argv); | |
8147 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
8148 | {; | |
8149 | } | |
8150 | allsigs = 0; | |
8151 | sigfirst = siglast = -1; | |
8152 | ||
8153 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
8154 | { | |
8155 | /* Apply action to all signals except those used by the | |
1777feb0 | 8156 | debugger. Silently skip those. */ |
c906108c SS |
8157 | allsigs = 1; |
8158 | sigfirst = 0; | |
8159 | siglast = nsigs - 1; | |
8160 | } | |
8161 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
8162 | { | |
8163 | SET_SIGS (nsigs, sigs, signal_stop); | |
8164 | SET_SIGS (nsigs, sigs, signal_print); | |
8165 | } | |
8166 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
8167 | { | |
8168 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8169 | } | |
8170 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
8171 | { | |
8172 | SET_SIGS (nsigs, sigs, signal_print); | |
8173 | } | |
8174 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
8175 | { | |
8176 | SET_SIGS (nsigs, sigs, signal_program); | |
8177 | } | |
8178 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
8179 | { | |
8180 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8181 | } | |
8182 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
8183 | { | |
8184 | SET_SIGS (nsigs, sigs, signal_program); | |
8185 | } | |
8186 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
8187 | { | |
8188 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8189 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8190 | } | |
8191 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
8192 | { | |
8193 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8194 | } | |
8195 | else if (digits > 0) | |
8196 | { | |
8197 | /* It is numeric. The numeric signal refers to our own | |
8198 | internal signal numbering from target.h, not to host/target | |
8199 | signal number. This is a feature; users really should be | |
8200 | using symbolic names anyway, and the common ones like | |
8201 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8202 | ||
8203 | sigfirst = siglast = (int) | |
2ea28649 | 8204 | gdb_signal_from_command (atoi (*argv)); |
c906108c SS |
8205 | if ((*argv)[digits] == '-') |
8206 | { | |
8207 | siglast = (int) | |
2ea28649 | 8208 | gdb_signal_from_command (atoi ((*argv) + digits + 1)); |
c906108c SS |
8209 | } |
8210 | if (sigfirst > siglast) | |
8211 | { | |
1777feb0 | 8212 | /* Bet he didn't figure we'd think of this case... */ |
c906108c SS |
8213 | signum = sigfirst; |
8214 | sigfirst = siglast; | |
8215 | siglast = signum; | |
8216 | } | |
8217 | } | |
8218 | else | |
8219 | { | |
2ea28649 | 8220 | oursig = gdb_signal_from_name (*argv); |
a493e3e2 | 8221 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8222 | { |
8223 | sigfirst = siglast = (int) oursig; | |
8224 | } | |
8225 | else | |
8226 | { | |
8227 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 8228 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
8229 | } |
8230 | } | |
8231 | ||
8232 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8233 | which signals to apply actions to. */ |
c906108c SS |
8234 | |
8235 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
8236 | { | |
2ea28649 | 8237 | switch ((enum gdb_signal) signum) |
c906108c | 8238 | { |
a493e3e2 PA |
8239 | case GDB_SIGNAL_TRAP: |
8240 | case GDB_SIGNAL_INT: | |
c906108c SS |
8241 | if (!allsigs && !sigs[signum]) |
8242 | { | |
9e2f0ad4 | 8243 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8244 | Are you sure you want to change it? "), |
2ea28649 | 8245 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8246 | { |
8247 | sigs[signum] = 1; | |
8248 | } | |
8249 | else | |
8250 | { | |
a3f17187 | 8251 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8252 | gdb_flush (gdb_stdout); |
8253 | } | |
8254 | } | |
8255 | break; | |
a493e3e2 PA |
8256 | case GDB_SIGNAL_0: |
8257 | case GDB_SIGNAL_DEFAULT: | |
8258 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8259 | /* Make sure that "all" doesn't print these. */ |
8260 | break; | |
8261 | default: | |
8262 | sigs[signum] = 1; | |
8263 | break; | |
8264 | } | |
8265 | } | |
8266 | ||
8267 | argv++; | |
8268 | } | |
8269 | ||
3a031f65 PA |
8270 | for (signum = 0; signum < nsigs; signum++) |
8271 | if (sigs[signum]) | |
8272 | { | |
2455069d | 8273 | signal_cache_update (-1); |
a493e3e2 PA |
8274 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); |
8275 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); | |
c906108c | 8276 | |
3a031f65 PA |
8277 | if (from_tty) |
8278 | { | |
8279 | /* Show the results. */ | |
8280 | sig_print_header (); | |
8281 | for (; signum < nsigs; signum++) | |
8282 | if (sigs[signum]) | |
aead7601 | 8283 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8284 | } |
8285 | ||
8286 | break; | |
8287 | } | |
c906108c SS |
8288 | |
8289 | do_cleanups (old_chain); | |
8290 | } | |
8291 | ||
de0bea00 MF |
8292 | /* Complete the "handle" command. */ |
8293 | ||
8294 | static VEC (char_ptr) * | |
8295 | handle_completer (struct cmd_list_element *ignore, | |
6f937416 | 8296 | const char *text, const char *word) |
de0bea00 MF |
8297 | { |
8298 | VEC (char_ptr) *vec_signals, *vec_keywords, *return_val; | |
8299 | static const char * const keywords[] = | |
8300 | { | |
8301 | "all", | |
8302 | "stop", | |
8303 | "ignore", | |
8304 | "print", | |
8305 | "pass", | |
8306 | "nostop", | |
8307 | "noignore", | |
8308 | "noprint", | |
8309 | "nopass", | |
8310 | NULL, | |
8311 | }; | |
8312 | ||
8313 | vec_signals = signal_completer (ignore, text, word); | |
8314 | vec_keywords = complete_on_enum (keywords, word, word); | |
8315 | ||
8316 | return_val = VEC_merge (char_ptr, vec_signals, vec_keywords); | |
8317 | VEC_free (char_ptr, vec_signals); | |
8318 | VEC_free (char_ptr, vec_keywords); | |
8319 | return return_val; | |
8320 | } | |
8321 | ||
2ea28649 PA |
8322 | enum gdb_signal |
8323 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8324 | { |
8325 | if (num >= 1 && num <= 15) | |
2ea28649 | 8326 | return (enum gdb_signal) num; |
ed01b82c PA |
8327 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8328 | Use \"info signals\" for a list of symbolic signals.")); | |
8329 | } | |
8330 | ||
c906108c SS |
8331 | /* Print current contents of the tables set by the handle command. |
8332 | It is possible we should just be printing signals actually used | |
8333 | by the current target (but for things to work right when switching | |
8334 | targets, all signals should be in the signal tables). */ | |
8335 | ||
8336 | static void | |
96baa820 | 8337 | signals_info (char *signum_exp, int from_tty) |
c906108c | 8338 | { |
2ea28649 | 8339 | enum gdb_signal oursig; |
abbb1732 | 8340 | |
c906108c SS |
8341 | sig_print_header (); |
8342 | ||
8343 | if (signum_exp) | |
8344 | { | |
8345 | /* First see if this is a symbol name. */ | |
2ea28649 | 8346 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8347 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8348 | { |
8349 | /* No, try numeric. */ | |
8350 | oursig = | |
2ea28649 | 8351 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8352 | } |
8353 | sig_print_info (oursig); | |
8354 | return; | |
8355 | } | |
8356 | ||
8357 | printf_filtered ("\n"); | |
8358 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8359 | for (oursig = GDB_SIGNAL_FIRST; |
8360 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8361 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8362 | { |
8363 | QUIT; | |
8364 | ||
a493e3e2 PA |
8365 | if (oursig != GDB_SIGNAL_UNKNOWN |
8366 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8367 | sig_print_info (oursig); |
8368 | } | |
8369 | ||
3e43a32a MS |
8370 | printf_filtered (_("\nUse the \"handle\" command " |
8371 | "to change these tables.\n")); | |
c906108c | 8372 | } |
4aa995e1 | 8373 | |
c709acd1 PA |
8374 | /* Check if it makes sense to read $_siginfo from the current thread |
8375 | at this point. If not, throw an error. */ | |
8376 | ||
8377 | static void | |
8378 | validate_siginfo_access (void) | |
8379 | { | |
8380 | /* No current inferior, no siginfo. */ | |
8381 | if (ptid_equal (inferior_ptid, null_ptid)) | |
8382 | error (_("No thread selected.")); | |
8383 | ||
8384 | /* Don't try to read from a dead thread. */ | |
8385 | if (is_exited (inferior_ptid)) | |
8386 | error (_("The current thread has terminated")); | |
8387 | ||
8388 | /* ... or from a spinning thread. */ | |
8389 | if (is_running (inferior_ptid)) | |
8390 | error (_("Selected thread is running.")); | |
8391 | } | |
8392 | ||
4aa995e1 PA |
8393 | /* The $_siginfo convenience variable is a bit special. We don't know |
8394 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8395 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8396 | also dependent on which thread you have selected. |
8397 | ||
8398 | 1. making $_siginfo be an internalvar that creates a new value on | |
8399 | access. | |
8400 | ||
8401 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8402 | ||
8403 | /* This function implements the lval_computed support for reading a | |
8404 | $_siginfo value. */ | |
8405 | ||
8406 | static void | |
8407 | siginfo_value_read (struct value *v) | |
8408 | { | |
8409 | LONGEST transferred; | |
8410 | ||
c709acd1 PA |
8411 | validate_siginfo_access (); |
8412 | ||
4aa995e1 PA |
8413 | transferred = |
8414 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
8415 | NULL, | |
8416 | value_contents_all_raw (v), | |
8417 | value_offset (v), | |
8418 | TYPE_LENGTH (value_type (v))); | |
8419 | ||
8420 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8421 | error (_("Unable to read siginfo")); | |
8422 | } | |
8423 | ||
8424 | /* This function implements the lval_computed support for writing a | |
8425 | $_siginfo value. */ | |
8426 | ||
8427 | static void | |
8428 | siginfo_value_write (struct value *v, struct value *fromval) | |
8429 | { | |
8430 | LONGEST transferred; | |
8431 | ||
c709acd1 PA |
8432 | validate_siginfo_access (); |
8433 | ||
4aa995e1 PA |
8434 | transferred = target_write (¤t_target, |
8435 | TARGET_OBJECT_SIGNAL_INFO, | |
8436 | NULL, | |
8437 | value_contents_all_raw (fromval), | |
8438 | value_offset (v), | |
8439 | TYPE_LENGTH (value_type (fromval))); | |
8440 | ||
8441 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8442 | error (_("Unable to write siginfo")); | |
8443 | } | |
8444 | ||
c8f2448a | 8445 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8446 | { |
8447 | siginfo_value_read, | |
8448 | siginfo_value_write | |
8449 | }; | |
8450 | ||
8451 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8452 | the current thread using architecture GDBARCH. Return a void value |
8453 | if there's no object available. */ | |
4aa995e1 | 8454 | |
2c0b251b | 8455 | static struct value * |
22d2b532 SDJ |
8456 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8457 | void *ignore) | |
4aa995e1 | 8458 | { |
4aa995e1 | 8459 | if (target_has_stack |
78267919 UW |
8460 | && !ptid_equal (inferior_ptid, null_ptid) |
8461 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
4aa995e1 | 8462 | { |
78267919 | 8463 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8464 | |
78267919 | 8465 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8466 | } |
8467 | ||
78267919 | 8468 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8469 | } |
8470 | ||
c906108c | 8471 | \f |
16c381f0 JK |
8472 | /* infcall_suspend_state contains state about the program itself like its |
8473 | registers and any signal it received when it last stopped. | |
8474 | This state must be restored regardless of how the inferior function call | |
8475 | ends (either successfully, or after it hits a breakpoint or signal) | |
8476 | if the program is to properly continue where it left off. */ | |
8477 | ||
8478 | struct infcall_suspend_state | |
7a292a7a | 8479 | { |
16c381f0 | 8480 | struct thread_suspend_state thread_suspend; |
16c381f0 JK |
8481 | |
8482 | /* Other fields: */ | |
7a292a7a | 8483 | CORE_ADDR stop_pc; |
b89667eb | 8484 | struct regcache *registers; |
1736ad11 | 8485 | |
35515841 | 8486 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
1736ad11 JK |
8487 | struct gdbarch *siginfo_gdbarch; |
8488 | ||
8489 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8490 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8491 | content would be invalid. */ | |
8492 | gdb_byte *siginfo_data; | |
b89667eb DE |
8493 | }; |
8494 | ||
16c381f0 JK |
8495 | struct infcall_suspend_state * |
8496 | save_infcall_suspend_state (void) | |
b89667eb | 8497 | { |
16c381f0 | 8498 | struct infcall_suspend_state *inf_state; |
b89667eb | 8499 | struct thread_info *tp = inferior_thread (); |
1736ad11 JK |
8500 | struct regcache *regcache = get_current_regcache (); |
8501 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
8502 | gdb_byte *siginfo_data = NULL; | |
8503 | ||
8504 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8505 | { | |
8506 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8507 | size_t len = TYPE_LENGTH (type); | |
8508 | struct cleanup *back_to; | |
8509 | ||
8510 | siginfo_data = xmalloc (len); | |
8511 | back_to = make_cleanup (xfree, siginfo_data); | |
8512 | ||
8513 | if (target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8514 | siginfo_data, 0, len) == len) | |
8515 | discard_cleanups (back_to); | |
8516 | else | |
8517 | { | |
8518 | /* Errors ignored. */ | |
8519 | do_cleanups (back_to); | |
8520 | siginfo_data = NULL; | |
8521 | } | |
8522 | } | |
8523 | ||
41bf6aca | 8524 | inf_state = XCNEW (struct infcall_suspend_state); |
1736ad11 JK |
8525 | |
8526 | if (siginfo_data) | |
8527 | { | |
8528 | inf_state->siginfo_gdbarch = gdbarch; | |
8529 | inf_state->siginfo_data = siginfo_data; | |
8530 | } | |
b89667eb | 8531 | |
16c381f0 | 8532 | inf_state->thread_suspend = tp->suspend; |
16c381f0 | 8533 | |
35515841 | 8534 | /* run_inferior_call will not use the signal due to its `proceed' call with |
a493e3e2 PA |
8535 | GDB_SIGNAL_0 anyway. */ |
8536 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
35515841 | 8537 | |
b89667eb DE |
8538 | inf_state->stop_pc = stop_pc; |
8539 | ||
1736ad11 | 8540 | inf_state->registers = regcache_dup (regcache); |
b89667eb DE |
8541 | |
8542 | return inf_state; | |
8543 | } | |
8544 | ||
8545 | /* Restore inferior session state to INF_STATE. */ | |
8546 | ||
8547 | void | |
16c381f0 | 8548 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8549 | { |
8550 | struct thread_info *tp = inferior_thread (); | |
1736ad11 JK |
8551 | struct regcache *regcache = get_current_regcache (); |
8552 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
b89667eb | 8553 | |
16c381f0 | 8554 | tp->suspend = inf_state->thread_suspend; |
16c381f0 | 8555 | |
b89667eb DE |
8556 | stop_pc = inf_state->stop_pc; |
8557 | ||
1736ad11 JK |
8558 | if (inf_state->siginfo_gdbarch == gdbarch) |
8559 | { | |
8560 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
1736ad11 JK |
8561 | |
8562 | /* Errors ignored. */ | |
8563 | target_write (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6acef6cd | 8564 | inf_state->siginfo_data, 0, TYPE_LENGTH (type)); |
1736ad11 JK |
8565 | } |
8566 | ||
b89667eb DE |
8567 | /* The inferior can be gone if the user types "print exit(0)" |
8568 | (and perhaps other times). */ | |
8569 | if (target_has_execution) | |
8570 | /* NB: The register write goes through to the target. */ | |
1736ad11 | 8571 | regcache_cpy (regcache, inf_state->registers); |
803b5f95 | 8572 | |
16c381f0 | 8573 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8574 | } |
8575 | ||
8576 | static void | |
16c381f0 | 8577 | do_restore_infcall_suspend_state_cleanup (void *state) |
b89667eb | 8578 | { |
16c381f0 | 8579 | restore_infcall_suspend_state (state); |
b89667eb DE |
8580 | } |
8581 | ||
8582 | struct cleanup * | |
16c381f0 JK |
8583 | make_cleanup_restore_infcall_suspend_state |
8584 | (struct infcall_suspend_state *inf_state) | |
b89667eb | 8585 | { |
16c381f0 | 8586 | return make_cleanup (do_restore_infcall_suspend_state_cleanup, inf_state); |
b89667eb DE |
8587 | } |
8588 | ||
8589 | void | |
16c381f0 | 8590 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8591 | { |
8592 | regcache_xfree (inf_state->registers); | |
803b5f95 | 8593 | xfree (inf_state->siginfo_data); |
b89667eb DE |
8594 | xfree (inf_state); |
8595 | } | |
8596 | ||
8597 | struct regcache * | |
16c381f0 | 8598 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8599 | { |
8600 | return inf_state->registers; | |
8601 | } | |
8602 | ||
16c381f0 JK |
8603 | /* infcall_control_state contains state regarding gdb's control of the |
8604 | inferior itself like stepping control. It also contains session state like | |
8605 | the user's currently selected frame. */ | |
b89667eb | 8606 | |
16c381f0 | 8607 | struct infcall_control_state |
b89667eb | 8608 | { |
16c381f0 JK |
8609 | struct thread_control_state thread_control; |
8610 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
8611 | |
8612 | /* Other fields: */ | |
8613 | enum stop_stack_kind stop_stack_dummy; | |
8614 | int stopped_by_random_signal; | |
7a292a7a | 8615 | int stop_after_trap; |
7a292a7a | 8616 | |
b89667eb | 8617 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe | 8618 | struct frame_id selected_frame_id; |
7a292a7a SS |
8619 | }; |
8620 | ||
c906108c | 8621 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 8622 | connection. */ |
c906108c | 8623 | |
16c381f0 JK |
8624 | struct infcall_control_state * |
8625 | save_infcall_control_state (void) | |
c906108c | 8626 | { |
8d749320 SM |
8627 | struct infcall_control_state *inf_status = |
8628 | XNEW (struct infcall_control_state); | |
4e1c45ea | 8629 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8630 | struct inferior *inf = current_inferior (); |
7a292a7a | 8631 | |
16c381f0 JK |
8632 | inf_status->thread_control = tp->control; |
8633 | inf_status->inferior_control = inf->control; | |
d82142e2 | 8634 | |
8358c15c | 8635 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 8636 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 8637 | |
16c381f0 JK |
8638 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
8639 | chain. If caller's caller is walking the chain, they'll be happier if we | |
8640 | hand them back the original chain when restore_infcall_control_state is | |
8641 | called. */ | |
8642 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
8643 | |
8644 | /* Other fields: */ | |
8645 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
8646 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
8647 | inf_status->stop_after_trap = stop_after_trap; | |
c5aa993b | 8648 | |
206415a3 | 8649 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 8650 | |
7a292a7a | 8651 | return inf_status; |
c906108c SS |
8652 | } |
8653 | ||
c906108c | 8654 | static int |
96baa820 | 8655 | restore_selected_frame (void *args) |
c906108c | 8656 | { |
488f131b | 8657 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 8658 | struct frame_info *frame; |
c906108c | 8659 | |
101dcfbe | 8660 | frame = frame_find_by_id (*fid); |
c906108c | 8661 | |
aa0cd9c1 AC |
8662 | /* If inf_status->selected_frame_id is NULL, there was no previously |
8663 | selected frame. */ | |
101dcfbe | 8664 | if (frame == NULL) |
c906108c | 8665 | { |
8a3fe4f8 | 8666 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
8667 | return 0; |
8668 | } | |
8669 | ||
0f7d239c | 8670 | select_frame (frame); |
c906108c SS |
8671 | |
8672 | return (1); | |
8673 | } | |
8674 | ||
b89667eb DE |
8675 | /* Restore inferior session state to INF_STATUS. */ |
8676 | ||
c906108c | 8677 | void |
16c381f0 | 8678 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 8679 | { |
4e1c45ea | 8680 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8681 | struct inferior *inf = current_inferior (); |
4e1c45ea | 8682 | |
8358c15c JK |
8683 | if (tp->control.step_resume_breakpoint) |
8684 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
8685 | ||
5b79abe7 TT |
8686 | if (tp->control.exception_resume_breakpoint) |
8687 | tp->control.exception_resume_breakpoint->disposition | |
8688 | = disp_del_at_next_stop; | |
8689 | ||
d82142e2 | 8690 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 8691 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 8692 | |
16c381f0 JK |
8693 | tp->control = inf_status->thread_control; |
8694 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
8695 | |
8696 | /* Other fields: */ | |
8697 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
8698 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
8699 | stop_after_trap = inf_status->stop_after_trap; | |
c906108c | 8700 | |
b89667eb | 8701 | if (target_has_stack) |
c906108c | 8702 | { |
c906108c | 8703 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
8704 | walking the stack might encounter a garbage pointer and |
8705 | error() trying to dereference it. */ | |
488f131b JB |
8706 | if (catch_errors |
8707 | (restore_selected_frame, &inf_status->selected_frame_id, | |
8708 | "Unable to restore previously selected frame:\n", | |
8709 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
8710 | /* Error in restoring the selected frame. Select the innermost |
8711 | frame. */ | |
0f7d239c | 8712 | select_frame (get_current_frame ()); |
c906108c | 8713 | } |
c906108c | 8714 | |
72cec141 | 8715 | xfree (inf_status); |
7a292a7a | 8716 | } |
c906108c | 8717 | |
74b7792f | 8718 | static void |
16c381f0 | 8719 | do_restore_infcall_control_state_cleanup (void *sts) |
74b7792f | 8720 | { |
16c381f0 | 8721 | restore_infcall_control_state (sts); |
74b7792f AC |
8722 | } |
8723 | ||
8724 | struct cleanup * | |
16c381f0 JK |
8725 | make_cleanup_restore_infcall_control_state |
8726 | (struct infcall_control_state *inf_status) | |
74b7792f | 8727 | { |
16c381f0 | 8728 | return make_cleanup (do_restore_infcall_control_state_cleanup, inf_status); |
74b7792f AC |
8729 | } |
8730 | ||
c906108c | 8731 | void |
16c381f0 | 8732 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 8733 | { |
8358c15c JK |
8734 | if (inf_status->thread_control.step_resume_breakpoint) |
8735 | inf_status->thread_control.step_resume_breakpoint->disposition | |
8736 | = disp_del_at_next_stop; | |
8737 | ||
5b79abe7 TT |
8738 | if (inf_status->thread_control.exception_resume_breakpoint) |
8739 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
8740 | = disp_del_at_next_stop; | |
8741 | ||
1777feb0 | 8742 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 8743 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 8744 | |
72cec141 | 8745 | xfree (inf_status); |
7a292a7a | 8746 | } |
b89667eb | 8747 | \f |
ca6724c1 KB |
8748 | /* restore_inferior_ptid() will be used by the cleanup machinery |
8749 | to restore the inferior_ptid value saved in a call to | |
8750 | save_inferior_ptid(). */ | |
ce696e05 KB |
8751 | |
8752 | static void | |
8753 | restore_inferior_ptid (void *arg) | |
8754 | { | |
8755 | ptid_t *saved_ptid_ptr = arg; | |
abbb1732 | 8756 | |
ce696e05 KB |
8757 | inferior_ptid = *saved_ptid_ptr; |
8758 | xfree (arg); | |
8759 | } | |
8760 | ||
8761 | /* Save the value of inferior_ptid so that it may be restored by a | |
8762 | later call to do_cleanups(). Returns the struct cleanup pointer | |
8763 | needed for later doing the cleanup. */ | |
8764 | ||
8765 | struct cleanup * | |
8766 | save_inferior_ptid (void) | |
8767 | { | |
8d749320 | 8768 | ptid_t *saved_ptid_ptr = XNEW (ptid_t); |
ce696e05 | 8769 | |
ce696e05 KB |
8770 | *saved_ptid_ptr = inferior_ptid; |
8771 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
8772 | } | |
0c557179 | 8773 | |
7f89fd65 | 8774 | /* See infrun.h. */ |
0c557179 SDJ |
8775 | |
8776 | void | |
8777 | clear_exit_convenience_vars (void) | |
8778 | { | |
8779 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
8780 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
8781 | } | |
c5aa993b | 8782 | \f |
488f131b | 8783 | |
b2175913 MS |
8784 | /* User interface for reverse debugging: |
8785 | Set exec-direction / show exec-direction commands | |
8786 | (returns error unless target implements to_set_exec_direction method). */ | |
8787 | ||
32231432 | 8788 | int execution_direction = EXEC_FORWARD; |
b2175913 MS |
8789 | static const char exec_forward[] = "forward"; |
8790 | static const char exec_reverse[] = "reverse"; | |
8791 | static const char *exec_direction = exec_forward; | |
40478521 | 8792 | static const char *const exec_direction_names[] = { |
b2175913 MS |
8793 | exec_forward, |
8794 | exec_reverse, | |
8795 | NULL | |
8796 | }; | |
8797 | ||
8798 | static void | |
8799 | set_exec_direction_func (char *args, int from_tty, | |
8800 | struct cmd_list_element *cmd) | |
8801 | { | |
8802 | if (target_can_execute_reverse) | |
8803 | { | |
8804 | if (!strcmp (exec_direction, exec_forward)) | |
8805 | execution_direction = EXEC_FORWARD; | |
8806 | else if (!strcmp (exec_direction, exec_reverse)) | |
8807 | execution_direction = EXEC_REVERSE; | |
8808 | } | |
8bbed405 MS |
8809 | else |
8810 | { | |
8811 | exec_direction = exec_forward; | |
8812 | error (_("Target does not support this operation.")); | |
8813 | } | |
b2175913 MS |
8814 | } |
8815 | ||
8816 | static void | |
8817 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
8818 | struct cmd_list_element *cmd, const char *value) | |
8819 | { | |
8820 | switch (execution_direction) { | |
8821 | case EXEC_FORWARD: | |
8822 | fprintf_filtered (out, _("Forward.\n")); | |
8823 | break; | |
8824 | case EXEC_REVERSE: | |
8825 | fprintf_filtered (out, _("Reverse.\n")); | |
8826 | break; | |
b2175913 | 8827 | default: |
d8b34453 PA |
8828 | internal_error (__FILE__, __LINE__, |
8829 | _("bogus execution_direction value: %d"), | |
8830 | (int) execution_direction); | |
b2175913 MS |
8831 | } |
8832 | } | |
8833 | ||
d4db2f36 PA |
8834 | static void |
8835 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
8836 | struct cmd_list_element *c, const char *value) | |
8837 | { | |
3e43a32a MS |
8838 | fprintf_filtered (file, _("Resuming the execution of threads " |
8839 | "of all processes is %s.\n"), value); | |
d4db2f36 | 8840 | } |
ad52ddc6 | 8841 | |
22d2b532 SDJ |
8842 | /* Implementation of `siginfo' variable. */ |
8843 | ||
8844 | static const struct internalvar_funcs siginfo_funcs = | |
8845 | { | |
8846 | siginfo_make_value, | |
8847 | NULL, | |
8848 | NULL | |
8849 | }; | |
8850 | ||
372316f1 PA |
8851 | /* Callback for infrun's target events source. This is marked when a |
8852 | thread has a pending status to process. */ | |
8853 | ||
8854 | static void | |
8855 | infrun_async_inferior_event_handler (gdb_client_data data) | |
8856 | { | |
372316f1 PA |
8857 | inferior_event_handler (INF_REG_EVENT, NULL); |
8858 | } | |
8859 | ||
c906108c | 8860 | void |
96baa820 | 8861 | _initialize_infrun (void) |
c906108c | 8862 | { |
52f0bd74 AC |
8863 | int i; |
8864 | int numsigs; | |
de0bea00 | 8865 | struct cmd_list_element *c; |
c906108c | 8866 | |
372316f1 PA |
8867 | /* Register extra event sources in the event loop. */ |
8868 | infrun_async_inferior_event_token | |
8869 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
8870 | ||
1bedd215 AC |
8871 | add_info ("signals", signals_info, _("\ |
8872 | What debugger does when program gets various signals.\n\ | |
8873 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
8874 | add_info_alias ("handle", "signals", 0); |
8875 | ||
de0bea00 | 8876 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 8877 | Specify how to handle signals.\n\ |
486c7739 | 8878 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 8879 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 8880 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
8881 | will be displayed instead.\n\ |
8882 | \n\ | |
c906108c SS |
8883 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
8884 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
8885 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
8886 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 8887 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 8888 | \n\ |
1bedd215 | 8889 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
8890 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
8891 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
8892 | Print means print a message if this signal happens.\n\ | |
8893 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
8894 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
8895 | Pass and Stop may be combined.\n\ |
8896 | \n\ | |
8897 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
8898 | may be interspersed with actions, with the actions being performed for\n\ | |
8899 | all signals cumulatively specified.")); | |
de0bea00 | 8900 | set_cmd_completer (c, handle_completer); |
486c7739 | 8901 | |
c906108c | 8902 | if (!dbx_commands) |
1a966eab AC |
8903 | stop_command = add_cmd ("stop", class_obscure, |
8904 | not_just_help_class_command, _("\ | |
8905 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 8906 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 8907 | of the program stops."), &cmdlist); |
c906108c | 8908 | |
ccce17b0 | 8909 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
8910 | Set inferior debugging."), _("\ |
8911 | Show inferior debugging."), _("\ | |
8912 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
8913 | NULL, |
8914 | show_debug_infrun, | |
8915 | &setdebuglist, &showdebuglist); | |
527159b7 | 8916 | |
3e43a32a MS |
8917 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
8918 | &debug_displaced, _("\ | |
237fc4c9 PA |
8919 | Set displaced stepping debugging."), _("\ |
8920 | Show displaced stepping debugging."), _("\ | |
8921 | When non-zero, displaced stepping specific debugging is enabled."), | |
8922 | NULL, | |
8923 | show_debug_displaced, | |
8924 | &setdebuglist, &showdebuglist); | |
8925 | ||
ad52ddc6 PA |
8926 | add_setshow_boolean_cmd ("non-stop", no_class, |
8927 | &non_stop_1, _("\ | |
8928 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
8929 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
8930 | When debugging a multi-threaded program and this setting is\n\ | |
8931 | off (the default, also called all-stop mode), when one thread stops\n\ | |
8932 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
8933 | all other threads in the program while you interact with the thread of\n\ | |
8934 | interest. When you continue or step a thread, you can allow the other\n\ | |
8935 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
8936 | thread's state, all threads stop.\n\ | |
8937 | \n\ | |
8938 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
8939 | to run freely. You'll be able to step each thread independently,\n\ | |
8940 | leave it stopped or free to run as needed."), | |
8941 | set_non_stop, | |
8942 | show_non_stop, | |
8943 | &setlist, | |
8944 | &showlist); | |
8945 | ||
a493e3e2 | 8946 | numsigs = (int) GDB_SIGNAL_LAST; |
8d749320 SM |
8947 | signal_stop = XNEWVEC (unsigned char, numsigs); |
8948 | signal_print = XNEWVEC (unsigned char, numsigs); | |
8949 | signal_program = XNEWVEC (unsigned char, numsigs); | |
8950 | signal_catch = XNEWVEC (unsigned char, numsigs); | |
8951 | signal_pass = XNEWVEC (unsigned char, numsigs); | |
c906108c SS |
8952 | for (i = 0; i < numsigs; i++) |
8953 | { | |
8954 | signal_stop[i] = 1; | |
8955 | signal_print[i] = 1; | |
8956 | signal_program[i] = 1; | |
ab04a2af | 8957 | signal_catch[i] = 0; |
c906108c SS |
8958 | } |
8959 | ||
4d9d9d04 PA |
8960 | /* Signals caused by debugger's own actions should not be given to |
8961 | the program afterwards. | |
8962 | ||
8963 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
8964 | explicitly specifies that it should be delivered to the target | |
8965 | program. Typically, that would occur when a user is debugging a | |
8966 | target monitor on a simulator: the target monitor sets a | |
8967 | breakpoint; the simulator encounters this breakpoint and halts | |
8968 | the simulation handing control to GDB; GDB, noting that the stop | |
8969 | address doesn't map to any known breakpoint, returns control back | |
8970 | to the simulator; the simulator then delivers the hardware | |
8971 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
8972 | debugged. */ | |
a493e3e2 PA |
8973 | signal_program[GDB_SIGNAL_TRAP] = 0; |
8974 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
8975 | |
8976 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
8977 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
8978 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
8979 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
8980 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
8981 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
8982 | signal_print[GDB_SIGNAL_PROF] = 0; | |
8983 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
8984 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
8985 | signal_stop[GDB_SIGNAL_IO] = 0; | |
8986 | signal_print[GDB_SIGNAL_IO] = 0; | |
8987 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
8988 | signal_print[GDB_SIGNAL_POLL] = 0; | |
8989 | signal_stop[GDB_SIGNAL_URG] = 0; | |
8990 | signal_print[GDB_SIGNAL_URG] = 0; | |
8991 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
8992 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
8993 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
8994 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 8995 | |
cd0fc7c3 SS |
8996 | /* These signals are used internally by user-level thread |
8997 | implementations. (See signal(5) on Solaris.) Like the above | |
8998 | signals, a healthy program receives and handles them as part of | |
8999 | its normal operation. */ | |
a493e3e2 PA |
9000 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9001 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9002 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9003 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9004 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9005 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
cd0fc7c3 | 9006 | |
2455069d UW |
9007 | /* Update cached state. */ |
9008 | signal_cache_update (-1); | |
9009 | ||
85c07804 AC |
9010 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9011 | &stop_on_solib_events, _("\ | |
9012 | Set stopping for shared library events."), _("\ | |
9013 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9014 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9015 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9016 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9017 | set_stop_on_solib_events, |
920d2a44 | 9018 | show_stop_on_solib_events, |
85c07804 | 9019 | &setlist, &showlist); |
c906108c | 9020 | |
7ab04401 AC |
9021 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9022 | follow_fork_mode_kind_names, | |
9023 | &follow_fork_mode_string, _("\ | |
9024 | Set debugger response to a program call of fork or vfork."), _("\ | |
9025 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9026 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9027 | parent - the original process is debugged after a fork\n\ | |
9028 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9029 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9030 | By default, the debugger will follow the parent process."), |
9031 | NULL, | |
920d2a44 | 9032 | show_follow_fork_mode_string, |
7ab04401 AC |
9033 | &setlist, &showlist); |
9034 | ||
6c95b8df PA |
9035 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9036 | follow_exec_mode_names, | |
9037 | &follow_exec_mode_string, _("\ | |
9038 | Set debugger response to a program call of exec."), _("\ | |
9039 | Show debugger response to a program call of exec."), _("\ | |
9040 | An exec call replaces the program image of a process.\n\ | |
9041 | \n\ | |
9042 | follow-exec-mode can be:\n\ | |
9043 | \n\ | |
cce7e648 | 9044 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9045 | to this new inferior. The program the process was running before\n\ |
9046 | the exec call can be restarted afterwards by restarting the original\n\ | |
9047 | inferior.\n\ | |
9048 | \n\ | |
9049 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9050 | The new executable image replaces the previous executable loaded in\n\ | |
9051 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9052 | the executable the process was running after the exec call.\n\ | |
9053 | \n\ | |
9054 | By default, the debugger will use the same inferior."), | |
9055 | NULL, | |
9056 | show_follow_exec_mode_string, | |
9057 | &setlist, &showlist); | |
9058 | ||
7ab04401 AC |
9059 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9060 | scheduler_enums, &scheduler_mode, _("\ | |
9061 | Set mode for locking scheduler during execution."), _("\ | |
9062 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
9063 | off == no locking (threads may preempt at any time)\n\ |
9064 | on == full locking (no thread except the current thread may run)\n\ | |
856e7dd6 PA |
9065 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ |
9066 | In this mode, other threads may run during other commands."), | |
7ab04401 | 9067 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9068 | show_scheduler_mode, |
7ab04401 | 9069 | &setlist, &showlist); |
5fbbeb29 | 9070 | |
d4db2f36 PA |
9071 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9072 | Set mode for resuming threads of all processes."), _("\ | |
9073 | Show mode for resuming threads of all processes."), _("\ | |
9074 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9075 | threads of all processes. When off (which is the default), execution\n\ | |
9076 | commands only resume the threads of the current process. The set of\n\ | |
9077 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9078 | mode (see help set scheduler-locking)."), | |
9079 | NULL, | |
9080 | show_schedule_multiple, | |
9081 | &setlist, &showlist); | |
9082 | ||
5bf193a2 AC |
9083 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9084 | Set mode of the step operation."), _("\ | |
9085 | Show mode of the step operation."), _("\ | |
9086 | When set, doing a step over a function without debug line information\n\ | |
9087 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9088 | function is skipped and the step command stops at a different source line."), | |
9089 | NULL, | |
920d2a44 | 9090 | show_step_stop_if_no_debug, |
5bf193a2 | 9091 | &setlist, &showlist); |
ca6724c1 | 9092 | |
72d0e2c5 YQ |
9093 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9094 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9095 | Set debugger's willingness to use displaced stepping."), _("\ |
9096 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9097 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9098 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9099 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9100 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9101 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9102 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9103 | NULL, |
9104 | show_can_use_displaced_stepping, | |
9105 | &setlist, &showlist); | |
237fc4c9 | 9106 | |
b2175913 MS |
9107 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9108 | &exec_direction, _("Set direction of execution.\n\ | |
9109 | Options are 'forward' or 'reverse'."), | |
9110 | _("Show direction of execution (forward/reverse)."), | |
9111 | _("Tells gdb whether to execute forward or backward."), | |
9112 | set_exec_direction_func, show_exec_direction_func, | |
9113 | &setlist, &showlist); | |
9114 | ||
6c95b8df PA |
9115 | /* Set/show detach-on-fork: user-settable mode. */ |
9116 | ||
9117 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9118 | Set whether gdb will detach the child of a fork."), _("\ | |
9119 | Show whether gdb will detach the child of a fork."), _("\ | |
9120 | Tells gdb whether to detach the child of a fork."), | |
9121 | NULL, NULL, &setlist, &showlist); | |
9122 | ||
03583c20 UW |
9123 | /* Set/show disable address space randomization mode. */ |
9124 | ||
9125 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9126 | &disable_randomization, _("\ | |
9127 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9128 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9129 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9130 | address space is disabled. Standalone programs run with the randomization\n\ | |
9131 | enabled by default on some platforms."), | |
9132 | &set_disable_randomization, | |
9133 | &show_disable_randomization, | |
9134 | &setlist, &showlist); | |
9135 | ||
ca6724c1 | 9136 | /* ptid initializations */ |
ca6724c1 KB |
9137 | inferior_ptid = null_ptid; |
9138 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd PA |
9139 | |
9140 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 9141 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 9142 | observer_attach_thread_exit (infrun_thread_thread_exit); |
fc1cf338 | 9143 | observer_attach_inferior_exit (infrun_inferior_exit); |
4aa995e1 PA |
9144 | |
9145 | /* Explicitly create without lookup, since that tries to create a | |
9146 | value with a void typed value, and when we get here, gdbarch | |
9147 | isn't initialized yet. At this point, we're quite sure there | |
9148 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9149 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9150 | |
9151 | add_setshow_boolean_cmd ("observer", no_class, | |
9152 | &observer_mode_1, _("\ | |
9153 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9154 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9155 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9156 | affect its execution. Registers and memory may not be changed,\n\ | |
9157 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9158 | or signalled."), | |
9159 | set_observer_mode, | |
9160 | show_observer_mode, | |
9161 | &setlist, | |
9162 | &showlist); | |
c906108c | 9163 | } |