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 | { | |
3235 | struct thread_info *tp; | |
3236 | ||
243a9253 PA |
3237 | /* Cancel any running execution command. */ |
3238 | thread_cancel_execution_command (info); | |
3239 | ||
252fbfc8 PA |
3240 | normal_stop (); |
3241 | ||
fa4cd53f | 3242 | /* Finish off the continuations. */ |
252fbfc8 | 3243 | tp = inferior_thread (); |
fa4cd53f PA |
3244 | do_all_intermediate_continuations_thread (tp, 1); |
3245 | do_all_continuations_thread (tp, 1); | |
252fbfc8 PA |
3246 | } |
3247 | ||
3248 | do_cleanups (old_chain); | |
3249 | } | |
3250 | ||
3251 | return 0; | |
3252 | } | |
3253 | ||
3254 | /* This function is attached as a "thread_stop_requested" observer. | |
3255 | Cleanup local state that assumed the PTID was to be resumed, and | |
3256 | report the stop to the frontend. */ | |
3257 | ||
2c0b251b | 3258 | static void |
252fbfc8 PA |
3259 | infrun_thread_stop_requested (ptid_t ptid) |
3260 | { | |
c2829269 | 3261 | struct thread_info *tp; |
252fbfc8 | 3262 | |
c2829269 PA |
3263 | /* PTID was requested to stop. Remove matching threads from the |
3264 | step-over queue, so we don't try to resume them | |
3265 | automatically. */ | |
3266 | ALL_NON_EXITED_THREADS (tp) | |
3267 | if (ptid_match (tp->ptid, ptid)) | |
3268 | { | |
3269 | if (thread_is_in_step_over_chain (tp)) | |
3270 | thread_step_over_chain_remove (tp); | |
3271 | } | |
252fbfc8 PA |
3272 | |
3273 | iterate_over_threads (infrun_thread_stop_requested_callback, &ptid); | |
3274 | } | |
3275 | ||
a07daef3 PA |
3276 | static void |
3277 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3278 | { | |
3279 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
3280 | nullify_last_target_wait_ptid (); | |
3281 | } | |
3282 | ||
0cbcdb96 PA |
3283 | /* Delete the step resume, single-step and longjmp/exception resume |
3284 | breakpoints of TP. */ | |
4e1c45ea | 3285 | |
0cbcdb96 PA |
3286 | static void |
3287 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3288 | { |
0cbcdb96 PA |
3289 | delete_step_resume_breakpoint (tp); |
3290 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3291 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3292 | } |
3293 | ||
0cbcdb96 PA |
3294 | /* If the target still has execution, call FUNC for each thread that |
3295 | just stopped. In all-stop, that's all the non-exited threads; in | |
3296 | non-stop, that's the current thread, only. */ | |
3297 | ||
3298 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3299 | (struct thread_info *tp); | |
4e1c45ea PA |
3300 | |
3301 | static void | |
0cbcdb96 | 3302 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3303 | { |
0cbcdb96 | 3304 | if (!target_has_execution || ptid_equal (inferior_ptid, null_ptid)) |
4e1c45ea PA |
3305 | return; |
3306 | ||
fbea99ea | 3307 | if (target_is_non_stop_p ()) |
4e1c45ea | 3308 | { |
0cbcdb96 PA |
3309 | /* If in non-stop mode, only the current thread stopped. */ |
3310 | func (inferior_thread ()); | |
4e1c45ea PA |
3311 | } |
3312 | else | |
0cbcdb96 PA |
3313 | { |
3314 | struct thread_info *tp; | |
3315 | ||
3316 | /* In all-stop mode, all threads have stopped. */ | |
3317 | ALL_NON_EXITED_THREADS (tp) | |
3318 | { | |
3319 | func (tp); | |
3320 | } | |
3321 | } | |
3322 | } | |
3323 | ||
3324 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3325 | the threads that just stopped. */ | |
3326 | ||
3327 | static void | |
3328 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3329 | { | |
3330 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3331 | } |
3332 | ||
3333 | /* Delete the single-step breakpoints of the threads that just | |
3334 | stopped. */ | |
7c16b83e | 3335 | |
34b7e8a6 PA |
3336 | static void |
3337 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3338 | { | |
3339 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3340 | } |
3341 | ||
1777feb0 | 3342 | /* A cleanup wrapper. */ |
4e1c45ea PA |
3343 | |
3344 | static void | |
0cbcdb96 | 3345 | delete_just_stopped_threads_infrun_breakpoints_cleanup (void *arg) |
4e1c45ea | 3346 | { |
0cbcdb96 | 3347 | delete_just_stopped_threads_infrun_breakpoints (); |
4e1c45ea PA |
3348 | } |
3349 | ||
221e1a37 | 3350 | /* See infrun.h. */ |
223698f8 | 3351 | |
221e1a37 | 3352 | void |
223698f8 DE |
3353 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3354 | const struct target_waitstatus *ws) | |
3355 | { | |
3356 | char *status_string = target_waitstatus_to_string (ws); | |
3357 | struct ui_file *tmp_stream = mem_fileopen (); | |
3358 | char *text; | |
223698f8 DE |
3359 | |
3360 | /* The text is split over several lines because it was getting too long. | |
3361 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3362 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3363 | is set. */ | |
3364 | ||
3365 | fprintf_unfiltered (tmp_stream, | |
1176ecec PA |
3366 | "infrun: target_wait (%d.%ld.%ld", |
3367 | ptid_get_pid (waiton_ptid), | |
3368 | ptid_get_lwp (waiton_ptid), | |
3369 | ptid_get_tid (waiton_ptid)); | |
dfd4cc63 | 3370 | if (ptid_get_pid (waiton_ptid) != -1) |
223698f8 DE |
3371 | fprintf_unfiltered (tmp_stream, |
3372 | " [%s]", target_pid_to_str (waiton_ptid)); | |
3373 | fprintf_unfiltered (tmp_stream, ", status) =\n"); | |
3374 | fprintf_unfiltered (tmp_stream, | |
1176ecec | 3375 | "infrun: %d.%ld.%ld [%s],\n", |
dfd4cc63 | 3376 | ptid_get_pid (result_ptid), |
1176ecec PA |
3377 | ptid_get_lwp (result_ptid), |
3378 | ptid_get_tid (result_ptid), | |
dfd4cc63 | 3379 | target_pid_to_str (result_ptid)); |
223698f8 DE |
3380 | fprintf_unfiltered (tmp_stream, |
3381 | "infrun: %s\n", | |
3382 | status_string); | |
3383 | ||
759ef836 | 3384 | text = ui_file_xstrdup (tmp_stream, NULL); |
223698f8 DE |
3385 | |
3386 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3387 | a gcc error: the format attribute requires a string literal. */ | |
3388 | fprintf_unfiltered (gdb_stdlog, "%s", text); | |
3389 | ||
3390 | xfree (status_string); | |
3391 | xfree (text); | |
3392 | ui_file_delete (tmp_stream); | |
3393 | } | |
3394 | ||
372316f1 PA |
3395 | /* Select a thread at random, out of those which are resumed and have |
3396 | had events. */ | |
3397 | ||
3398 | static struct thread_info * | |
3399 | random_pending_event_thread (ptid_t waiton_ptid) | |
3400 | { | |
3401 | struct thread_info *event_tp; | |
3402 | int num_events = 0; | |
3403 | int random_selector; | |
3404 | ||
3405 | /* First see how many events we have. Count only resumed threads | |
3406 | that have an event pending. */ | |
3407 | ALL_NON_EXITED_THREADS (event_tp) | |
3408 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3409 | && event_tp->resumed | |
3410 | && event_tp->suspend.waitstatus_pending_p) | |
3411 | num_events++; | |
3412 | ||
3413 | if (num_events == 0) | |
3414 | return NULL; | |
3415 | ||
3416 | /* Now randomly pick a thread out of those that have had events. */ | |
3417 | random_selector = (int) | |
3418 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
3419 | ||
3420 | if (debug_infrun && num_events > 1) | |
3421 | fprintf_unfiltered (gdb_stdlog, | |
3422 | "infrun: Found %d events, selecting #%d\n", | |
3423 | num_events, random_selector); | |
3424 | ||
3425 | /* Select the Nth thread that has had an event. */ | |
3426 | ALL_NON_EXITED_THREADS (event_tp) | |
3427 | if (ptid_match (event_tp->ptid, waiton_ptid) | |
3428 | && event_tp->resumed | |
3429 | && event_tp->suspend.waitstatus_pending_p) | |
3430 | if (random_selector-- == 0) | |
3431 | break; | |
3432 | ||
3433 | return event_tp; | |
3434 | } | |
3435 | ||
3436 | /* Wrapper for target_wait that first checks whether threads have | |
3437 | pending statuses to report before actually asking the target for | |
3438 | more events. */ | |
3439 | ||
3440 | static ptid_t | |
3441 | do_target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
3442 | { | |
3443 | ptid_t event_ptid; | |
3444 | struct thread_info *tp; | |
3445 | ||
3446 | /* First check if there is a resumed thread with a wait status | |
3447 | pending. */ | |
3448 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) | |
3449 | { | |
3450 | tp = random_pending_event_thread (ptid); | |
3451 | } | |
3452 | else | |
3453 | { | |
3454 | if (debug_infrun) | |
3455 | fprintf_unfiltered (gdb_stdlog, | |
3456 | "infrun: Waiting for specific thread %s.\n", | |
3457 | target_pid_to_str (ptid)); | |
3458 | ||
3459 | /* We have a specific thread to check. */ | |
3460 | tp = find_thread_ptid (ptid); | |
3461 | gdb_assert (tp != NULL); | |
3462 | if (!tp->suspend.waitstatus_pending_p) | |
3463 | tp = NULL; | |
3464 | } | |
3465 | ||
3466 | if (tp != NULL | |
3467 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3468 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3469 | { | |
3470 | struct regcache *regcache = get_thread_regcache (tp->ptid); | |
3471 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3472 | CORE_ADDR pc; | |
3473 | int discard = 0; | |
3474 | ||
3475 | pc = regcache_read_pc (regcache); | |
3476 | ||
3477 | if (pc != tp->suspend.stop_pc) | |
3478 | { | |
3479 | if (debug_infrun) | |
3480 | fprintf_unfiltered (gdb_stdlog, | |
3481 | "infrun: PC of %s changed. was=%s, now=%s\n", | |
3482 | target_pid_to_str (tp->ptid), | |
3483 | paddress (gdbarch, tp->prev_pc), | |
3484 | paddress (gdbarch, pc)); | |
3485 | discard = 1; | |
3486 | } | |
3487 | else if (!breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3488 | { | |
3489 | if (debug_infrun) | |
3490 | fprintf_unfiltered (gdb_stdlog, | |
3491 | "infrun: previous breakpoint of %s, at %s gone\n", | |
3492 | target_pid_to_str (tp->ptid), | |
3493 | paddress (gdbarch, pc)); | |
3494 | ||
3495 | discard = 1; | |
3496 | } | |
3497 | ||
3498 | if (discard) | |
3499 | { | |
3500 | if (debug_infrun) | |
3501 | fprintf_unfiltered (gdb_stdlog, | |
3502 | "infrun: pending event of %s cancelled.\n", | |
3503 | target_pid_to_str (tp->ptid)); | |
3504 | ||
3505 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3506 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3507 | } | |
3508 | } | |
3509 | ||
3510 | if (tp != NULL) | |
3511 | { | |
3512 | if (debug_infrun) | |
3513 | { | |
3514 | char *statstr; | |
3515 | ||
3516 | statstr = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
3517 | fprintf_unfiltered (gdb_stdlog, | |
3518 | "infrun: Using pending wait status %s for %s.\n", | |
3519 | statstr, | |
3520 | target_pid_to_str (tp->ptid)); | |
3521 | xfree (statstr); | |
3522 | } | |
3523 | ||
3524 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3525 | if it was a software breakpoint (and the target doesn't | |
3526 | always adjust the PC itself). */ | |
3527 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3528 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3529 | { | |
3530 | struct regcache *regcache; | |
3531 | struct gdbarch *gdbarch; | |
3532 | int decr_pc; | |
3533 | ||
3534 | regcache = get_thread_regcache (tp->ptid); | |
3535 | gdbarch = get_regcache_arch (regcache); | |
3536 | ||
3537 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3538 | if (decr_pc != 0) | |
3539 | { | |
3540 | CORE_ADDR pc; | |
3541 | ||
3542 | pc = regcache_read_pc (regcache); | |
3543 | regcache_write_pc (regcache, pc + decr_pc); | |
3544 | } | |
3545 | } | |
3546 | ||
3547 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3548 | *status = tp->suspend.waitstatus; | |
3549 | tp->suspend.waitstatus_pending_p = 0; | |
3550 | ||
3551 | /* Wake up the event loop again, until all pending events are | |
3552 | processed. */ | |
3553 | if (target_is_async_p ()) | |
3554 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3555 | return tp->ptid; | |
3556 | } | |
3557 | ||
3558 | /* But if we don't find one, we'll have to wait. */ | |
3559 | ||
3560 | if (deprecated_target_wait_hook) | |
3561 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3562 | else | |
3563 | event_ptid = target_wait (ptid, status, options); | |
3564 | ||
3565 | return event_ptid; | |
3566 | } | |
3567 | ||
24291992 PA |
3568 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3569 | detaching while a thread is displaced stepping is a recipe for | |
3570 | crashing it, as nothing would readjust the PC out of the scratch | |
3571 | pad. */ | |
3572 | ||
3573 | void | |
3574 | prepare_for_detach (void) | |
3575 | { | |
3576 | struct inferior *inf = current_inferior (); | |
3577 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
3578 | struct cleanup *old_chain_1; | |
3579 | struct displaced_step_inferior_state *displaced; | |
3580 | ||
3581 | displaced = get_displaced_stepping_state (inf->pid); | |
3582 | ||
3583 | /* Is any thread of this process displaced stepping? If not, | |
3584 | there's nothing else to do. */ | |
3585 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
3586 | return; | |
3587 | ||
3588 | if (debug_infrun) | |
3589 | fprintf_unfiltered (gdb_stdlog, | |
3590 | "displaced-stepping in-process while detaching"); | |
3591 | ||
3592 | old_chain_1 = make_cleanup_restore_integer (&inf->detaching); | |
3593 | inf->detaching = 1; | |
3594 | ||
3595 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
3596 | { | |
3597 | struct cleanup *old_chain_2; | |
3598 | struct execution_control_state ecss; | |
3599 | struct execution_control_state *ecs; | |
3600 | ||
3601 | ecs = &ecss; | |
3602 | memset (ecs, 0, sizeof (*ecs)); | |
3603 | ||
3604 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3605 | /* Flush target cache before starting to handle each event. |
3606 | Target was running and cache could be stale. This is just a | |
3607 | heuristic. Running threads may modify target memory, but we | |
3608 | don't get any event. */ | |
3609 | target_dcache_invalidate (); | |
24291992 | 3610 | |
372316f1 | 3611 | ecs->ptid = do_target_wait (pid_ptid, &ecs->ws, 0); |
24291992 PA |
3612 | |
3613 | if (debug_infrun) | |
3614 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3615 | ||
3616 | /* If an error happens while handling the event, propagate GDB's | |
3617 | knowledge of the executing state to the frontend/user running | |
3618 | state. */ | |
3e43a32a MS |
3619 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, |
3620 | &minus_one_ptid); | |
24291992 PA |
3621 | |
3622 | /* Now figure out what to do with the result of the result. */ | |
3623 | handle_inferior_event (ecs); | |
3624 | ||
3625 | /* No error, don't finish the state yet. */ | |
3626 | discard_cleanups (old_chain_2); | |
3627 | ||
3628 | /* Breakpoints and watchpoints are not installed on the target | |
3629 | at this point, and signals are passed directly to the | |
3630 | inferior, so this must mean the process is gone. */ | |
3631 | if (!ecs->wait_some_more) | |
3632 | { | |
3633 | discard_cleanups (old_chain_1); | |
3634 | error (_("Program exited while detaching")); | |
3635 | } | |
3636 | } | |
3637 | ||
3638 | discard_cleanups (old_chain_1); | |
3639 | } | |
3640 | ||
cd0fc7c3 | 3641 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3642 | |
cd0fc7c3 SS |
3643 | If inferior gets a signal, we may decide to start it up again |
3644 | instead of returning. That is why there is a loop in this function. | |
3645 | When this function actually returns it means the inferior | |
3646 | should be left stopped and GDB should read more commands. */ | |
3647 | ||
3648 | void | |
e4c8541f | 3649 | wait_for_inferior (void) |
cd0fc7c3 SS |
3650 | { |
3651 | struct cleanup *old_cleanups; | |
e6f5c25b | 3652 | struct cleanup *thread_state_chain; |
c906108c | 3653 | |
527159b7 | 3654 | if (debug_infrun) |
ae123ec6 | 3655 | fprintf_unfiltered |
e4c8541f | 3656 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3657 | |
0cbcdb96 PA |
3658 | old_cleanups |
3659 | = make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, | |
3660 | NULL); | |
cd0fc7c3 | 3661 | |
e6f5c25b PA |
3662 | /* If an error happens while handling the event, propagate GDB's |
3663 | knowledge of the executing state to the frontend/user running | |
3664 | state. */ | |
3665 | thread_state_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
3666 | ||
c906108c SS |
3667 | while (1) |
3668 | { | |
ae25568b PA |
3669 | struct execution_control_state ecss; |
3670 | struct execution_control_state *ecs = &ecss; | |
963f9c80 | 3671 | ptid_t waiton_ptid = minus_one_ptid; |
29f49a6a | 3672 | |
ae25568b PA |
3673 | memset (ecs, 0, sizeof (*ecs)); |
3674 | ||
ec9499be | 3675 | overlay_cache_invalid = 1; |
ec9499be | 3676 | |
f15cb84a YQ |
3677 | /* Flush target cache before starting to handle each event. |
3678 | Target was running and cache could be stale. This is just a | |
3679 | heuristic. Running threads may modify target memory, but we | |
3680 | don't get any event. */ | |
3681 | target_dcache_invalidate (); | |
3682 | ||
372316f1 | 3683 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 3684 | |
f00150c9 | 3685 | if (debug_infrun) |
223698f8 | 3686 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3687 | |
cd0fc7c3 SS |
3688 | /* Now figure out what to do with the result of the result. */ |
3689 | handle_inferior_event (ecs); | |
c906108c | 3690 | |
cd0fc7c3 SS |
3691 | if (!ecs->wait_some_more) |
3692 | break; | |
3693 | } | |
4e1c45ea | 3694 | |
e6f5c25b PA |
3695 | /* No error, don't finish the state yet. */ |
3696 | discard_cleanups (thread_state_chain); | |
3697 | ||
cd0fc7c3 SS |
3698 | do_cleanups (old_cleanups); |
3699 | } | |
c906108c | 3700 | |
d3d4baed PA |
3701 | /* Cleanup that reinstalls the readline callback handler, if the |
3702 | target is running in the background. If while handling the target | |
3703 | event something triggered a secondary prompt, like e.g., a | |
3704 | pagination prompt, we'll have removed the callback handler (see | |
3705 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3706 | event loop, ready to process further input. Note this has no | |
3707 | effect if the handler hasn't actually been removed, because calling | |
3708 | rl_callback_handler_install resets the line buffer, thus losing | |
3709 | input. */ | |
3710 | ||
3711 | static void | |
3712 | reinstall_readline_callback_handler_cleanup (void *arg) | |
3713 | { | |
6c400b59 PA |
3714 | if (!interpreter_async) |
3715 | { | |
3716 | /* We're not going back to the top level event loop yet. Don't | |
3717 | install the readline callback, as it'd prep the terminal, | |
3718 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3719 | it the next time the prompt is displayed, when we're ready | |
3720 | for input. */ | |
3721 | return; | |
3722 | } | |
3723 | ||
d3d4baed PA |
3724 | if (async_command_editing_p && !sync_execution) |
3725 | gdb_rl_callback_handler_reinstall (); | |
3726 | } | |
3727 | ||
243a9253 PA |
3728 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3729 | that's just the event thread. In all-stop, that's all threads. */ | |
3730 | ||
3731 | static void | |
3732 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3733 | { | |
3734 | struct thread_info *thr = ecs->event_thread; | |
3735 | ||
3736 | if (thr != NULL && thr->thread_fsm != NULL) | |
3737 | thread_fsm_clean_up (thr->thread_fsm); | |
3738 | ||
3739 | if (!non_stop) | |
3740 | { | |
3741 | ALL_NON_EXITED_THREADS (thr) | |
3742 | { | |
3743 | if (thr->thread_fsm == NULL) | |
3744 | continue; | |
3745 | if (thr == ecs->event_thread) | |
3746 | continue; | |
3747 | ||
3748 | switch_to_thread (thr->ptid); | |
3749 | thread_fsm_clean_up (thr->thread_fsm); | |
3750 | } | |
3751 | ||
3752 | if (ecs->event_thread != NULL) | |
3753 | switch_to_thread (ecs->event_thread->ptid); | |
3754 | } | |
3755 | } | |
3756 | ||
1777feb0 | 3757 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3758 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3759 | descriptor corresponding to the target. It can be called more than |
3760 | once to complete a single execution command. In such cases we need | |
3761 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3762 | that this function is called for a single execution command, then |
3763 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3764 | necessary cleanups. */ |
43ff13b4 JM |
3765 | |
3766 | void | |
fba45db2 | 3767 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3768 | { |
0d1e5fa7 | 3769 | struct execution_control_state ecss; |
a474d7c2 | 3770 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 3771 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 3772 | struct cleanup *ts_old_chain; |
4f8d22e3 | 3773 | int was_sync = sync_execution; |
0f641c01 | 3774 | int cmd_done = 0; |
963f9c80 | 3775 | ptid_t waiton_ptid = minus_one_ptid; |
43ff13b4 | 3776 | |
0d1e5fa7 PA |
3777 | memset (ecs, 0, sizeof (*ecs)); |
3778 | ||
d3d4baed PA |
3779 | /* End up with readline processing input, if necessary. */ |
3780 | make_cleanup (reinstall_readline_callback_handler_cleanup, NULL); | |
3781 | ||
c5187ac6 PA |
3782 | /* We're handling a live event, so make sure we're doing live |
3783 | debugging. If we're looking at traceframes while the target is | |
3784 | running, we're going to need to get back to that mode after | |
3785 | handling the event. */ | |
3786 | if (non_stop) | |
3787 | { | |
3788 | make_cleanup_restore_current_traceframe (); | |
e6e4e701 | 3789 | set_current_traceframe (-1); |
c5187ac6 PA |
3790 | } |
3791 | ||
4f8d22e3 PA |
3792 | if (non_stop) |
3793 | /* In non-stop mode, the user/frontend should not notice a thread | |
3794 | switch due to internal events. Make sure we reverse to the | |
3795 | user selected thread and frame after handling the event and | |
3796 | running any breakpoint commands. */ | |
3797 | make_cleanup_restore_current_thread (); | |
3798 | ||
ec9499be | 3799 | overlay_cache_invalid = 1; |
f15cb84a YQ |
3800 | /* Flush target cache before starting to handle each event. Target |
3801 | was running and cache could be stale. This is just a heuristic. | |
3802 | Running threads may modify target memory, but we don't get any | |
3803 | event. */ | |
3804 | target_dcache_invalidate (); | |
3dd5b83d | 3805 | |
32231432 PA |
3806 | make_cleanup_restore_integer (&execution_direction); |
3807 | execution_direction = target_execution_direction (); | |
3808 | ||
0b333c5e PA |
3809 | ecs->ptid = do_target_wait (waiton_ptid, &ecs->ws, |
3810 | target_can_async_p () ? TARGET_WNOHANG : 0); | |
43ff13b4 | 3811 | |
f00150c9 | 3812 | if (debug_infrun) |
223698f8 | 3813 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3814 | |
29f49a6a PA |
3815 | /* If an error happens while handling the event, propagate GDB's |
3816 | knowledge of the executing state to the frontend/user running | |
3817 | state. */ | |
fbea99ea | 3818 | if (!target_is_non_stop_p ()) |
29f49a6a PA |
3819 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); |
3820 | else | |
3821 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
3822 | ||
353d1d73 JK |
3823 | /* Get executed before make_cleanup_restore_current_thread above to apply |
3824 | still for the thread which has thrown the exception. */ | |
3825 | make_bpstat_clear_actions_cleanup (); | |
3826 | ||
7c16b83e PA |
3827 | make_cleanup (delete_just_stopped_threads_infrun_breakpoints_cleanup, NULL); |
3828 | ||
43ff13b4 | 3829 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 3830 | handle_inferior_event (ecs); |
43ff13b4 | 3831 | |
a474d7c2 | 3832 | if (!ecs->wait_some_more) |
43ff13b4 | 3833 | { |
c9657e70 | 3834 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
243a9253 PA |
3835 | int should_stop = 1; |
3836 | struct thread_info *thr = ecs->event_thread; | |
388a7084 | 3837 | int should_notify_stop = 1; |
d6b48e9c | 3838 | |
0cbcdb96 | 3839 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3840 | |
243a9253 PA |
3841 | if (thr != NULL) |
3842 | { | |
3843 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
3844 | ||
3845 | if (thread_fsm != NULL) | |
3846 | should_stop = thread_fsm_should_stop (thread_fsm); | |
3847 | } | |
3848 | ||
3849 | if (!should_stop) | |
3850 | { | |
3851 | keep_going (ecs); | |
3852 | } | |
c2d11a7d | 3853 | else |
0f641c01 | 3854 | { |
243a9253 PA |
3855 | clean_up_just_stopped_threads_fsms (ecs); |
3856 | ||
388a7084 PA |
3857 | if (thr != NULL && thr->thread_fsm != NULL) |
3858 | { | |
3859 | should_notify_stop | |
3860 | = thread_fsm_should_notify_stop (thr->thread_fsm); | |
3861 | } | |
3862 | ||
3863 | if (should_notify_stop) | |
3864 | { | |
3865 | /* We may not find an inferior if this was a process exit. */ | |
3866 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
3867 | normal_stop (); | |
243a9253 | 3868 | |
388a7084 PA |
3869 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); |
3870 | cmd_done = 1; | |
3871 | } | |
0f641c01 | 3872 | } |
43ff13b4 | 3873 | } |
4f8d22e3 | 3874 | |
29f49a6a PA |
3875 | /* No error, don't finish the thread states yet. */ |
3876 | discard_cleanups (ts_old_chain); | |
3877 | ||
4f8d22e3 PA |
3878 | /* Revert thread and frame. */ |
3879 | do_cleanups (old_chain); | |
3880 | ||
3881 | /* If the inferior was in sync execution mode, and now isn't, | |
0f641c01 PA |
3882 | restore the prompt (a synchronous execution command has finished, |
3883 | and we're ready for input). */ | |
b4a14fd0 | 3884 | if (interpreter_async && was_sync && !sync_execution) |
92bcb5f9 | 3885 | observer_notify_sync_execution_done (); |
0f641c01 PA |
3886 | |
3887 | if (cmd_done | |
3888 | && !was_sync | |
3889 | && exec_done_display_p | |
3890 | && (ptid_equal (inferior_ptid, null_ptid) | |
3891 | || !is_running (inferior_ptid))) | |
3892 | printf_unfiltered (_("completed.\n")); | |
43ff13b4 JM |
3893 | } |
3894 | ||
edb3359d DJ |
3895 | /* Record the frame and location we're currently stepping through. */ |
3896 | void | |
3897 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
3898 | { | |
3899 | struct thread_info *tp = inferior_thread (); | |
3900 | ||
16c381f0 JK |
3901 | tp->control.step_frame_id = get_frame_id (frame); |
3902 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
3903 | |
3904 | tp->current_symtab = sal.symtab; | |
3905 | tp->current_line = sal.line; | |
3906 | } | |
3907 | ||
0d1e5fa7 PA |
3908 | /* Clear context switchable stepping state. */ |
3909 | ||
3910 | void | |
4e1c45ea | 3911 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 3912 | { |
7f5ef605 | 3913 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 3914 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 3915 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 3916 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
3917 | } |
3918 | ||
c32c64b7 DE |
3919 | /* Set the cached copy of the last ptid/waitstatus. */ |
3920 | ||
3921 | static void | |
3922 | set_last_target_status (ptid_t ptid, struct target_waitstatus status) | |
3923 | { | |
3924 | target_last_wait_ptid = ptid; | |
3925 | target_last_waitstatus = status; | |
3926 | } | |
3927 | ||
e02bc4cc | 3928 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
3929 | target_wait()/deprecated_target_wait_hook(). The data is actually |
3930 | cached by handle_inferior_event(), which gets called immediately | |
3931 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
3932 | |
3933 | void | |
488f131b | 3934 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 3935 | { |
39f77062 | 3936 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
3937 | *status = target_last_waitstatus; |
3938 | } | |
3939 | ||
ac264b3b MS |
3940 | void |
3941 | nullify_last_target_wait_ptid (void) | |
3942 | { | |
3943 | target_last_wait_ptid = minus_one_ptid; | |
3944 | } | |
3945 | ||
dcf4fbde | 3946 | /* Switch thread contexts. */ |
dd80620e MS |
3947 | |
3948 | static void | |
0d1e5fa7 | 3949 | context_switch (ptid_t ptid) |
dd80620e | 3950 | { |
4b51d87b | 3951 | if (debug_infrun && !ptid_equal (ptid, inferior_ptid)) |
fd48f117 DJ |
3952 | { |
3953 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
3954 | target_pid_to_str (inferior_ptid)); | |
3955 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 3956 | target_pid_to_str (ptid)); |
fd48f117 DJ |
3957 | } |
3958 | ||
0d1e5fa7 | 3959 | switch_to_thread (ptid); |
dd80620e MS |
3960 | } |
3961 | ||
d8dd4d5f PA |
3962 | /* If the target can't tell whether we've hit breakpoints |
3963 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
3964 | check whether that could have been caused by a breakpoint. If so, | |
3965 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
3966 | ||
4fa8626c | 3967 | static void |
d8dd4d5f PA |
3968 | adjust_pc_after_break (struct thread_info *thread, |
3969 | struct target_waitstatus *ws) | |
4fa8626c | 3970 | { |
24a73cce UW |
3971 | struct regcache *regcache; |
3972 | struct gdbarch *gdbarch; | |
6c95b8df | 3973 | struct address_space *aspace; |
118e6252 | 3974 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 3975 | |
4fa8626c DJ |
3976 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
3977 | we aren't, just return. | |
9709f61c DJ |
3978 | |
3979 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
3980 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
3981 | implemented by software breakpoints should be handled through the normal | |
3982 | breakpoint layer. | |
8fb3e588 | 3983 | |
4fa8626c DJ |
3984 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
3985 | different signals (SIGILL or SIGEMT for instance), but it is less | |
3986 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
3987 | gdbarch_decr_pc_after_break. I don't know any specific target that |
3988 | generates these signals at breakpoints (the code has been in GDB since at | |
3989 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 3990 | |
e6cf7916 UW |
3991 | In earlier versions of GDB, a target with |
3992 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
3993 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
3994 | target with both of these set in GDB history, and it seems unlikely to be | |
3995 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 3996 | |
d8dd4d5f | 3997 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
3998 | return; |
3999 | ||
d8dd4d5f | 4000 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4001 | return; |
4002 | ||
4058b839 PA |
4003 | /* In reverse execution, when a breakpoint is hit, the instruction |
4004 | under it has already been de-executed. The reported PC always | |
4005 | points at the breakpoint address, so adjusting it further would | |
4006 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4007 | architecture: | |
4008 | ||
4009 | B1 0x08000000 : INSN1 | |
4010 | B2 0x08000001 : INSN2 | |
4011 | 0x08000002 : INSN3 | |
4012 | PC -> 0x08000003 : INSN4 | |
4013 | ||
4014 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4015 | from that point should hit B2 as below. Reading the PC when the | |
4016 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4017 | been de-executed already. | |
4018 | ||
4019 | B1 0x08000000 : INSN1 | |
4020 | B2 PC -> 0x08000001 : INSN2 | |
4021 | 0x08000002 : INSN3 | |
4022 | 0x08000003 : INSN4 | |
4023 | ||
4024 | We can't apply the same logic as for forward execution, because | |
4025 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4026 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4027 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4028 | behaviour. */ | |
4029 | if (execution_direction == EXEC_REVERSE) | |
4030 | return; | |
4031 | ||
1cf4d951 PA |
4032 | /* If the target can tell whether the thread hit a SW breakpoint, |
4033 | trust it. Targets that can tell also adjust the PC | |
4034 | themselves. */ | |
4035 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4036 | return; | |
4037 | ||
4038 | /* Note that relying on whether a breakpoint is planted in memory to | |
4039 | determine this can fail. E.g,. the breakpoint could have been | |
4040 | removed since. Or the thread could have been told to step an | |
4041 | instruction the size of a breakpoint instruction, and only | |
4042 | _after_ was a breakpoint inserted at its address. */ | |
4043 | ||
24a73cce UW |
4044 | /* If this target does not decrement the PC after breakpoints, then |
4045 | we have nothing to do. */ | |
d8dd4d5f | 4046 | regcache = get_thread_regcache (thread->ptid); |
24a73cce | 4047 | gdbarch = get_regcache_arch (regcache); |
118e6252 | 4048 | |
527a273a | 4049 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4050 | if (decr_pc == 0) |
24a73cce UW |
4051 | return; |
4052 | ||
6c95b8df PA |
4053 | aspace = get_regcache_aspace (regcache); |
4054 | ||
8aad930b AC |
4055 | /* Find the location where (if we've hit a breakpoint) the |
4056 | breakpoint would be. */ | |
118e6252 | 4057 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4058 | |
1cf4d951 PA |
4059 | /* If the target can't tell whether a software breakpoint triggered, |
4060 | fallback to figuring it out based on breakpoints we think were | |
4061 | inserted in the target, and on whether the thread was stepped or | |
4062 | continued. */ | |
4063 | ||
1c5cfe86 PA |
4064 | /* Check whether there actually is a software breakpoint inserted at |
4065 | that location. | |
4066 | ||
4067 | If in non-stop mode, a race condition is possible where we've | |
4068 | removed a breakpoint, but stop events for that breakpoint were | |
4069 | already queued and arrive later. To suppress those spurious | |
4070 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4071 | and retire them after a number of stop events are reported. Note |
4072 | this is an heuristic and can thus get confused. The real fix is | |
4073 | to get the "stopped by SW BP and needs adjustment" info out of | |
4074 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4075 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4076 | || (target_is_non_stop_p () |
4077 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4078 | { |
77f9e713 | 4079 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); |
abbb1732 | 4080 | |
8213266a | 4081 | if (record_full_is_used ()) |
77f9e713 | 4082 | record_full_gdb_operation_disable_set (); |
96429cc8 | 4083 | |
1c0fdd0e UW |
4084 | /* When using hardware single-step, a SIGTRAP is reported for both |
4085 | a completed single-step and a software breakpoint. Need to | |
4086 | differentiate between the two, as the latter needs adjusting | |
4087 | but the former does not. | |
4088 | ||
4089 | The SIGTRAP can be due to a completed hardware single-step only if | |
4090 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4091 | - this thread is currently being stepped |
4092 | ||
4093 | If any of these events did not occur, we must have stopped due | |
4094 | to hitting a software breakpoint, and have to back up to the | |
4095 | breakpoint address. | |
4096 | ||
4097 | As a special case, we could have hardware single-stepped a | |
4098 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4099 | we also need to back up to the breakpoint address. */ | |
4100 | ||
d8dd4d5f PA |
4101 | if (thread_has_single_step_breakpoints_set (thread) |
4102 | || !currently_stepping (thread) | |
4103 | || (thread->stepped_breakpoint | |
4104 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4105 | regcache_write_pc (regcache, breakpoint_pc); |
96429cc8 | 4106 | |
77f9e713 | 4107 | do_cleanups (old_cleanups); |
8aad930b | 4108 | } |
4fa8626c DJ |
4109 | } |
4110 | ||
edb3359d DJ |
4111 | static int |
4112 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4113 | { | |
4114 | for (frame = get_prev_frame (frame); | |
4115 | frame != NULL; | |
4116 | frame = get_prev_frame (frame)) | |
4117 | { | |
4118 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4119 | return 1; | |
4120 | if (get_frame_type (frame) != INLINE_FRAME) | |
4121 | break; | |
4122 | } | |
4123 | ||
4124 | return 0; | |
4125 | } | |
4126 | ||
a96d9b2e SDJ |
4127 | /* Auxiliary function that handles syscall entry/return events. |
4128 | It returns 1 if the inferior should keep going (and GDB | |
4129 | should ignore the event), or 0 if the event deserves to be | |
4130 | processed. */ | |
ca2163eb | 4131 | |
a96d9b2e | 4132 | static int |
ca2163eb | 4133 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4134 | { |
ca2163eb | 4135 | struct regcache *regcache; |
ca2163eb PA |
4136 | int syscall_number; |
4137 | ||
4138 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
4139 | context_switch (ecs->ptid); | |
4140 | ||
4141 | regcache = get_thread_regcache (ecs->ptid); | |
f90263c1 | 4142 | syscall_number = ecs->ws.value.syscall_number; |
ca2163eb PA |
4143 | stop_pc = regcache_read_pc (regcache); |
4144 | ||
a96d9b2e SDJ |
4145 | if (catch_syscall_enabled () > 0 |
4146 | && catching_syscall_number (syscall_number) > 0) | |
4147 | { | |
4148 | if (debug_infrun) | |
4149 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
4150 | syscall_number); | |
a96d9b2e | 4151 | |
16c381f0 | 4152 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4153 | = bpstat_stop_status (get_regcache_aspace (regcache), |
09ac7c10 | 4154 | stop_pc, ecs->ptid, &ecs->ws); |
ab04a2af | 4155 | |
ce12b012 | 4156 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4157 | { |
4158 | /* Catchpoint hit. */ | |
ca2163eb PA |
4159 | return 0; |
4160 | } | |
a96d9b2e | 4161 | } |
ca2163eb PA |
4162 | |
4163 | /* If no catchpoint triggered for this, then keep going. */ | |
ca2163eb PA |
4164 | keep_going (ecs); |
4165 | return 1; | |
a96d9b2e SDJ |
4166 | } |
4167 | ||
7e324e48 GB |
4168 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4169 | ||
4170 | static void | |
4171 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4172 | struct execution_control_state *ecs) | |
4173 | { | |
4174 | if (!ecs->stop_func_filled_in) | |
4175 | { | |
4176 | /* Don't care about return value; stop_func_start and stop_func_name | |
4177 | will both be 0 if it doesn't work. */ | |
4178 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
4179 | &ecs->stop_func_start, &ecs->stop_func_end); | |
4180 | ecs->stop_func_start | |
4181 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4182 | ||
591a12a1 UW |
4183 | if (gdbarch_skip_entrypoint_p (gdbarch)) |
4184 | ecs->stop_func_start = gdbarch_skip_entrypoint (gdbarch, | |
4185 | ecs->stop_func_start); | |
4186 | ||
7e324e48 GB |
4187 | ecs->stop_func_filled_in = 1; |
4188 | } | |
4189 | } | |
4190 | ||
4f5d7f63 PA |
4191 | |
4192 | /* Return the STOP_SOON field of the inferior pointed at by PTID. */ | |
4193 | ||
4194 | static enum stop_kind | |
4195 | get_inferior_stop_soon (ptid_t ptid) | |
4196 | { | |
c9657e70 | 4197 | struct inferior *inf = find_inferior_ptid (ptid); |
4f5d7f63 PA |
4198 | |
4199 | gdb_assert (inf != NULL); | |
4200 | return inf->control.stop_soon; | |
4201 | } | |
4202 | ||
372316f1 PA |
4203 | /* Wait for one event. Store the resulting waitstatus in WS, and |
4204 | return the event ptid. */ | |
4205 | ||
4206 | static ptid_t | |
4207 | wait_one (struct target_waitstatus *ws) | |
4208 | { | |
4209 | ptid_t event_ptid; | |
4210 | ptid_t wait_ptid = minus_one_ptid; | |
4211 | ||
4212 | overlay_cache_invalid = 1; | |
4213 | ||
4214 | /* Flush target cache before starting to handle each event. | |
4215 | Target was running and cache could be stale. This is just a | |
4216 | heuristic. Running threads may modify target memory, but we | |
4217 | don't get any event. */ | |
4218 | target_dcache_invalidate (); | |
4219 | ||
4220 | if (deprecated_target_wait_hook) | |
4221 | event_ptid = deprecated_target_wait_hook (wait_ptid, ws, 0); | |
4222 | else | |
4223 | event_ptid = target_wait (wait_ptid, ws, 0); | |
4224 | ||
4225 | if (debug_infrun) | |
4226 | print_target_wait_results (wait_ptid, event_ptid, ws); | |
4227 | ||
4228 | return event_ptid; | |
4229 | } | |
4230 | ||
4231 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID | |
4232 | instead of the current thread. */ | |
4233 | #define THREAD_STOPPED_BY(REASON) \ | |
4234 | static int \ | |
4235 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4236 | { \ | |
4237 | struct cleanup *old_chain; \ | |
4238 | int res; \ | |
4239 | \ | |
4240 | old_chain = save_inferior_ptid (); \ | |
4241 | inferior_ptid = ptid; \ | |
4242 | \ | |
4243 | res = target_stopped_by_ ## REASON (); \ | |
4244 | \ | |
4245 | do_cleanups (old_chain); \ | |
4246 | \ | |
4247 | return res; \ | |
4248 | } | |
4249 | ||
4250 | /* Generate thread_stopped_by_watchpoint. */ | |
4251 | THREAD_STOPPED_BY (watchpoint) | |
4252 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4253 | THREAD_STOPPED_BY (sw_breakpoint) | |
4254 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4255 | THREAD_STOPPED_BY (hw_breakpoint) | |
4256 | ||
4257 | /* Cleanups that switches to the PTID pointed at by PTID_P. */ | |
4258 | ||
4259 | static void | |
4260 | switch_to_thread_cleanup (void *ptid_p) | |
4261 | { | |
4262 | ptid_t ptid = *(ptid_t *) ptid_p; | |
4263 | ||
4264 | switch_to_thread (ptid); | |
4265 | } | |
4266 | ||
4267 | /* Save the thread's event and stop reason to process it later. */ | |
4268 | ||
4269 | static void | |
4270 | save_waitstatus (struct thread_info *tp, struct target_waitstatus *ws) | |
4271 | { | |
4272 | struct regcache *regcache; | |
4273 | struct address_space *aspace; | |
4274 | ||
4275 | if (debug_infrun) | |
4276 | { | |
4277 | char *statstr; | |
4278 | ||
4279 | statstr = target_waitstatus_to_string (ws); | |
4280 | fprintf_unfiltered (gdb_stdlog, | |
4281 | "infrun: saving status %s for %d.%ld.%ld\n", | |
4282 | statstr, | |
4283 | ptid_get_pid (tp->ptid), | |
4284 | ptid_get_lwp (tp->ptid), | |
4285 | ptid_get_tid (tp->ptid)); | |
4286 | xfree (statstr); | |
4287 | } | |
4288 | ||
4289 | /* Record for later. */ | |
4290 | tp->suspend.waitstatus = *ws; | |
4291 | tp->suspend.waitstatus_pending_p = 1; | |
4292 | ||
4293 | regcache = get_thread_regcache (tp->ptid); | |
4294 | aspace = get_regcache_aspace (regcache); | |
4295 | ||
4296 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4297 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4298 | { | |
4299 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4300 | ||
4301 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4302 | ||
4303 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4304 | { | |
4305 | tp->suspend.stop_reason | |
4306 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4307 | } | |
4308 | else if (target_supports_stopped_by_sw_breakpoint () | |
4309 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4310 | { | |
4311 | tp->suspend.stop_reason | |
4312 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4313 | } | |
4314 | else if (target_supports_stopped_by_hw_breakpoint () | |
4315 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4316 | { | |
4317 | tp->suspend.stop_reason | |
4318 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4319 | } | |
4320 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4321 | && hardware_breakpoint_inserted_here_p (aspace, | |
4322 | pc)) | |
4323 | { | |
4324 | tp->suspend.stop_reason | |
4325 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4326 | } | |
4327 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4328 | && software_breakpoint_inserted_here_p (aspace, | |
4329 | pc)) | |
4330 | { | |
4331 | tp->suspend.stop_reason | |
4332 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4333 | } | |
4334 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4335 | && currently_stepping (tp)) | |
4336 | { | |
4337 | tp->suspend.stop_reason | |
4338 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4339 | } | |
4340 | } | |
4341 | } | |
4342 | ||
4343 | /* Stop all threads. */ | |
4344 | ||
4345 | static void | |
4346 | stop_all_threads (void) | |
4347 | { | |
4348 | /* We may need multiple passes to discover all threads. */ | |
4349 | int pass; | |
4350 | int iterations = 0; | |
4351 | ptid_t entry_ptid; | |
4352 | struct cleanup *old_chain; | |
4353 | ||
fbea99ea | 4354 | gdb_assert (target_is_non_stop_p ()); |
372316f1 PA |
4355 | |
4356 | if (debug_infrun) | |
4357 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n"); | |
4358 | ||
4359 | entry_ptid = inferior_ptid; | |
4360 | old_chain = make_cleanup (switch_to_thread_cleanup, &entry_ptid); | |
4361 | ||
4362 | /* Request threads to stop, and then wait for the stops. Because | |
4363 | threads we already know about can spawn more threads while we're | |
4364 | trying to stop them, and we only learn about new threads when we | |
4365 | update the thread list, do this in a loop, and keep iterating | |
4366 | until two passes find no threads that need to be stopped. */ | |
4367 | for (pass = 0; pass < 2; pass++, iterations++) | |
4368 | { | |
4369 | if (debug_infrun) | |
4370 | fprintf_unfiltered (gdb_stdlog, | |
4371 | "infrun: stop_all_threads, pass=%d, " | |
4372 | "iterations=%d\n", pass, iterations); | |
4373 | while (1) | |
4374 | { | |
4375 | ptid_t event_ptid; | |
4376 | struct target_waitstatus ws; | |
4377 | int need_wait = 0; | |
4378 | struct thread_info *t; | |
4379 | ||
4380 | update_thread_list (); | |
4381 | ||
4382 | /* Go through all threads looking for threads that we need | |
4383 | to tell the target to stop. */ | |
4384 | ALL_NON_EXITED_THREADS (t) | |
4385 | { | |
4386 | if (t->executing) | |
4387 | { | |
4388 | /* If already stopping, don't request a stop again. | |
4389 | We just haven't seen the notification yet. */ | |
4390 | if (!t->stop_requested) | |
4391 | { | |
4392 | if (debug_infrun) | |
4393 | fprintf_unfiltered (gdb_stdlog, | |
4394 | "infrun: %s executing, " | |
4395 | "need stop\n", | |
4396 | target_pid_to_str (t->ptid)); | |
4397 | target_stop (t->ptid); | |
4398 | t->stop_requested = 1; | |
4399 | } | |
4400 | else | |
4401 | { | |
4402 | if (debug_infrun) | |
4403 | fprintf_unfiltered (gdb_stdlog, | |
4404 | "infrun: %s executing, " | |
4405 | "already stopping\n", | |
4406 | target_pid_to_str (t->ptid)); | |
4407 | } | |
4408 | ||
4409 | if (t->stop_requested) | |
4410 | need_wait = 1; | |
4411 | } | |
4412 | else | |
4413 | { | |
4414 | if (debug_infrun) | |
4415 | fprintf_unfiltered (gdb_stdlog, | |
4416 | "infrun: %s not executing\n", | |
4417 | target_pid_to_str (t->ptid)); | |
4418 | ||
4419 | /* The thread may be not executing, but still be | |
4420 | resumed with a pending status to process. */ | |
4421 | t->resumed = 0; | |
4422 | } | |
4423 | } | |
4424 | ||
4425 | if (!need_wait) | |
4426 | break; | |
4427 | ||
4428 | /* If we find new threads on the second iteration, restart | |
4429 | over. We want to see two iterations in a row with all | |
4430 | threads stopped. */ | |
4431 | if (pass > 0) | |
4432 | pass = -1; | |
4433 | ||
4434 | event_ptid = wait_one (&ws); | |
4435 | if (ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4436 | { | |
4437 | /* All resumed threads exited. */ | |
4438 | } | |
4439 | else if (ws.kind == TARGET_WAITKIND_EXITED | |
4440 | || ws.kind == TARGET_WAITKIND_SIGNALLED) | |
4441 | { | |
4442 | if (debug_infrun) | |
4443 | { | |
4444 | ptid_t ptid = pid_to_ptid (ws.value.integer); | |
4445 | ||
4446 | fprintf_unfiltered (gdb_stdlog, | |
4447 | "infrun: %s exited while " | |
4448 | "stopping threads\n", | |
4449 | target_pid_to_str (ptid)); | |
4450 | } | |
4451 | } | |
4452 | else | |
4453 | { | |
4454 | t = find_thread_ptid (event_ptid); | |
4455 | if (t == NULL) | |
4456 | t = add_thread (event_ptid); | |
4457 | ||
4458 | t->stop_requested = 0; | |
4459 | t->executing = 0; | |
4460 | t->resumed = 0; | |
4461 | t->control.may_range_step = 0; | |
4462 | ||
4463 | if (ws.kind == TARGET_WAITKIND_STOPPED | |
4464 | && ws.value.sig == GDB_SIGNAL_0) | |
4465 | { | |
4466 | /* We caught the event that we intended to catch, so | |
4467 | there's no event pending. */ | |
4468 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4469 | t->suspend.waitstatus_pending_p = 0; | |
4470 | ||
4471 | if (displaced_step_fixup (t->ptid, GDB_SIGNAL_0) < 0) | |
4472 | { | |
4473 | /* Add it back to the step-over queue. */ | |
4474 | if (debug_infrun) | |
4475 | { | |
4476 | fprintf_unfiltered (gdb_stdlog, | |
4477 | "infrun: displaced-step of %s " | |
4478 | "canceled: adding back to the " | |
4479 | "step-over queue\n", | |
4480 | target_pid_to_str (t->ptid)); | |
4481 | } | |
4482 | t->control.trap_expected = 0; | |
4483 | thread_step_over_chain_enqueue (t); | |
4484 | } | |
4485 | } | |
4486 | else | |
4487 | { | |
4488 | enum gdb_signal sig; | |
4489 | struct regcache *regcache; | |
4490 | struct address_space *aspace; | |
4491 | ||
4492 | if (debug_infrun) | |
4493 | { | |
4494 | char *statstr; | |
4495 | ||
4496 | statstr = target_waitstatus_to_string (&ws); | |
4497 | fprintf_unfiltered (gdb_stdlog, | |
4498 | "infrun: target_wait %s, saving " | |
4499 | "status for %d.%ld.%ld\n", | |
4500 | statstr, | |
4501 | ptid_get_pid (t->ptid), | |
4502 | ptid_get_lwp (t->ptid), | |
4503 | ptid_get_tid (t->ptid)); | |
4504 | xfree (statstr); | |
4505 | } | |
4506 | ||
4507 | /* Record for later. */ | |
4508 | save_waitstatus (t, &ws); | |
4509 | ||
4510 | sig = (ws.kind == TARGET_WAITKIND_STOPPED | |
4511 | ? ws.value.sig : GDB_SIGNAL_0); | |
4512 | ||
4513 | if (displaced_step_fixup (t->ptid, sig) < 0) | |
4514 | { | |
4515 | /* Add it back to the step-over queue. */ | |
4516 | t->control.trap_expected = 0; | |
4517 | thread_step_over_chain_enqueue (t); | |
4518 | } | |
4519 | ||
4520 | regcache = get_thread_regcache (t->ptid); | |
4521 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4522 | ||
4523 | if (debug_infrun) | |
4524 | { | |
4525 | fprintf_unfiltered (gdb_stdlog, | |
4526 | "infrun: saved stop_pc=%s for %s " | |
4527 | "(currently_stepping=%d)\n", | |
4528 | paddress (target_gdbarch (), | |
4529 | t->suspend.stop_pc), | |
4530 | target_pid_to_str (t->ptid), | |
4531 | currently_stepping (t)); | |
4532 | } | |
4533 | } | |
4534 | } | |
4535 | } | |
4536 | } | |
4537 | ||
4538 | do_cleanups (old_chain); | |
4539 | ||
4540 | if (debug_infrun) | |
4541 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n"); | |
4542 | } | |
4543 | ||
05ba8510 PA |
4544 | /* Given an execution control state that has been freshly filled in by |
4545 | an event from the inferior, figure out what it means and take | |
4546 | appropriate action. | |
4547 | ||
4548 | The alternatives are: | |
4549 | ||
22bcd14b | 4550 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
4551 | debugger. |
4552 | ||
4553 | 2) keep_going and return; to wait for the next event (set | |
4554 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
4555 | once). */ | |
c906108c | 4556 | |
ec9499be | 4557 | static void |
0b6e5e10 | 4558 | handle_inferior_event_1 (struct execution_control_state *ecs) |
cd0fc7c3 | 4559 | { |
d6b48e9c PA |
4560 | enum stop_kind stop_soon; |
4561 | ||
28736962 PA |
4562 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
4563 | { | |
4564 | /* We had an event in the inferior, but we are not interested in | |
4565 | handling it at this level. The lower layers have already | |
4566 | done what needs to be done, if anything. | |
4567 | ||
4568 | One of the possible circumstances for this is when the | |
4569 | inferior produces output for the console. The inferior has | |
4570 | not stopped, and we are ignoring the event. Another possible | |
4571 | circumstance is any event which the lower level knows will be | |
4572 | reported multiple times without an intervening resume. */ | |
4573 | if (debug_infrun) | |
4574 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
4575 | prepare_to_wait (ecs); | |
4576 | return; | |
4577 | } | |
4578 | ||
0e5bf2a8 PA |
4579 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
4580 | && target_can_async_p () && !sync_execution) | |
4581 | { | |
4582 | /* There were no unwaited-for children left in the target, but, | |
4583 | we're not synchronously waiting for events either. Just | |
4584 | ignore. Otherwise, if we were running a synchronous | |
4585 | execution command, we need to cancel it and give the user | |
4586 | back the terminal. */ | |
4587 | if (debug_infrun) | |
4588 | fprintf_unfiltered (gdb_stdlog, | |
4589 | "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n"); | |
4590 | prepare_to_wait (ecs); | |
4591 | return; | |
4592 | } | |
4593 | ||
1777feb0 | 4594 | /* Cache the last pid/waitstatus. */ |
c32c64b7 | 4595 | set_last_target_status (ecs->ptid, ecs->ws); |
e02bc4cc | 4596 | |
ca005067 | 4597 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 4598 | stop_stack_dummy = STOP_NONE; |
ca005067 | 4599 | |
0e5bf2a8 PA |
4600 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
4601 | { | |
4602 | /* No unwaited-for children left. IOW, all resumed children | |
4603 | have exited. */ | |
4604 | if (debug_infrun) | |
4605 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
4606 | ||
4607 | stop_print_frame = 0; | |
22bcd14b | 4608 | stop_waiting (ecs); |
0e5bf2a8 PA |
4609 | return; |
4610 | } | |
4611 | ||
8c90c137 | 4612 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 4613 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 PA |
4614 | { |
4615 | ecs->event_thread = find_thread_ptid (ecs->ptid); | |
4616 | /* If it's a new thread, add it to the thread database. */ | |
4617 | if (ecs->event_thread == NULL) | |
4618 | ecs->event_thread = add_thread (ecs->ptid); | |
c1e36e3e PA |
4619 | |
4620 | /* Disable range stepping. If the next step request could use a | |
4621 | range, this will be end up re-enabled then. */ | |
4622 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 4623 | } |
88ed393a JK |
4624 | |
4625 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 4626 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
4627 | |
4628 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
4629 | reinit_frame_cache (); | |
4630 | ||
28736962 PA |
4631 | breakpoint_retire_moribund (); |
4632 | ||
2b009048 DJ |
4633 | /* First, distinguish signals caused by the debugger from signals |
4634 | that have to do with the program's own actions. Note that | |
4635 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
4636 | on the operating system version. Here we detect when a SIGILL or | |
4637 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
4638 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
4639 | when we're trying to execute a breakpoint instruction on a | |
4640 | non-executable stack. This happens for call dummy breakpoints | |
4641 | for architectures like SPARC that place call dummies on the | |
4642 | stack. */ | |
2b009048 | 4643 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
4644 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
4645 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
4646 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 4647 | { |
de0a0249 UW |
4648 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
4649 | ||
4650 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
4651 | regcache_read_pc (regcache))) | |
4652 | { | |
4653 | if (debug_infrun) | |
4654 | fprintf_unfiltered (gdb_stdlog, | |
4655 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 4656 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 4657 | } |
2b009048 DJ |
4658 | } |
4659 | ||
28736962 PA |
4660 | /* Mark the non-executing threads accordingly. In all-stop, all |
4661 | threads of all processes are stopped when we get any event | |
e1316e60 | 4662 | reported. In non-stop mode, only the event thread stops. */ |
372316f1 PA |
4663 | { |
4664 | ptid_t mark_ptid; | |
4665 | ||
fbea99ea | 4666 | if (!target_is_non_stop_p ()) |
372316f1 PA |
4667 | mark_ptid = minus_one_ptid; |
4668 | else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED | |
4669 | || ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4670 | { | |
4671 | /* If we're handling a process exit in non-stop mode, even | |
4672 | though threads haven't been deleted yet, one would think | |
4673 | that there is nothing to do, as threads of the dead process | |
4674 | will be soon deleted, and threads of any other process were | |
4675 | left running. However, on some targets, threads survive a | |
4676 | process exit event. E.g., for the "checkpoint" command, | |
4677 | when the current checkpoint/fork exits, linux-fork.c | |
4678 | automatically switches to another fork from within | |
4679 | target_mourn_inferior, by associating the same | |
4680 | inferior/thread to another fork. We haven't mourned yet at | |
4681 | this point, but we must mark any threads left in the | |
4682 | process as not-executing so that finish_thread_state marks | |
4683 | them stopped (in the user's perspective) if/when we present | |
4684 | the stop to the user. */ | |
4685 | mark_ptid = pid_to_ptid (ptid_get_pid (ecs->ptid)); | |
4686 | } | |
4687 | else | |
4688 | mark_ptid = ecs->ptid; | |
4689 | ||
4690 | set_executing (mark_ptid, 0); | |
4691 | ||
4692 | /* Likewise the resumed flag. */ | |
4693 | set_resumed (mark_ptid, 0); | |
4694 | } | |
8c90c137 | 4695 | |
488f131b JB |
4696 | switch (ecs->ws.kind) |
4697 | { | |
4698 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 4699 | if (debug_infrun) |
8a9de0e4 | 4700 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
5c09a2c5 PA |
4701 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
4702 | context_switch (ecs->ptid); | |
b0f4b84b DJ |
4703 | /* Ignore gracefully during startup of the inferior, as it might |
4704 | be the shell which has just loaded some objects, otherwise | |
4705 | add the symbols for the newly loaded objects. Also ignore at | |
4706 | the beginning of an attach or remote session; we will query | |
4707 | the full list of libraries once the connection is | |
4708 | established. */ | |
4f5d7f63 PA |
4709 | |
4710 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
c0236d92 | 4711 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 4712 | { |
edcc5120 TT |
4713 | struct regcache *regcache; |
4714 | ||
edcc5120 TT |
4715 | regcache = get_thread_regcache (ecs->ptid); |
4716 | ||
4717 | handle_solib_event (); | |
4718 | ||
4719 | ecs->event_thread->control.stop_bpstat | |
4720 | = bpstat_stop_status (get_regcache_aspace (regcache), | |
4721 | stop_pc, ecs->ptid, &ecs->ws); | |
ab04a2af | 4722 | |
ce12b012 | 4723 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
4724 | { |
4725 | /* A catchpoint triggered. */ | |
94c57d6a PA |
4726 | process_event_stop_test (ecs); |
4727 | return; | |
edcc5120 | 4728 | } |
488f131b | 4729 | |
b0f4b84b DJ |
4730 | /* If requested, stop when the dynamic linker notifies |
4731 | gdb of events. This allows the user to get control | |
4732 | and place breakpoints in initializer routines for | |
4733 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 4734 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
4735 | if (stop_on_solib_events) |
4736 | { | |
55409f9d DJ |
4737 | /* Make sure we print "Stopped due to solib-event" in |
4738 | normal_stop. */ | |
4739 | stop_print_frame = 1; | |
4740 | ||
22bcd14b | 4741 | stop_waiting (ecs); |
b0f4b84b DJ |
4742 | return; |
4743 | } | |
488f131b | 4744 | } |
b0f4b84b DJ |
4745 | |
4746 | /* If we are skipping through a shell, or through shared library | |
4747 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 4748 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
4749 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
4750 | { | |
74960c60 VP |
4751 | /* Loading of shared libraries might have changed breakpoint |
4752 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 4753 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 4754 | insert_breakpoints (); |
64ce06e4 | 4755 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
4756 | prepare_to_wait (ecs); |
4757 | return; | |
4758 | } | |
4759 | ||
5c09a2c5 PA |
4760 | /* But stop if we're attaching or setting up a remote |
4761 | connection. */ | |
4762 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
4763 | || stop_soon == STOP_QUIETLY_REMOTE) | |
4764 | { | |
4765 | if (debug_infrun) | |
4766 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 4767 | stop_waiting (ecs); |
5c09a2c5 PA |
4768 | return; |
4769 | } | |
4770 | ||
4771 | internal_error (__FILE__, __LINE__, | |
4772 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 4773 | |
488f131b | 4774 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 4775 | if (debug_infrun) |
8a9de0e4 | 4776 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
64776a0b | 4777 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
8b3ee56d | 4778 | context_switch (ecs->ptid); |
64ce06e4 | 4779 | resume (GDB_SIGNAL_0); |
488f131b JB |
4780 | prepare_to_wait (ecs); |
4781 | return; | |
c5aa993b | 4782 | |
488f131b | 4783 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 4784 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 4785 | if (debug_infrun) |
940c3c06 PA |
4786 | { |
4787 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
4788 | fprintf_unfiltered (gdb_stdlog, | |
4789 | "infrun: TARGET_WAITKIND_EXITED\n"); | |
4790 | else | |
4791 | fprintf_unfiltered (gdb_stdlog, | |
4792 | "infrun: TARGET_WAITKIND_SIGNALLED\n"); | |
4793 | } | |
4794 | ||
fb66883a | 4795 | inferior_ptid = ecs->ptid; |
c9657e70 | 4796 | set_current_inferior (find_inferior_ptid (ecs->ptid)); |
6c95b8df PA |
4797 | set_current_program_space (current_inferior ()->pspace); |
4798 | handle_vfork_child_exec_or_exit (0); | |
1777feb0 | 4799 | target_terminal_ours (); /* Must do this before mourn anyway. */ |
488f131b | 4800 | |
0c557179 SDJ |
4801 | /* Clearing any previous state of convenience variables. */ |
4802 | clear_exit_convenience_vars (); | |
4803 | ||
940c3c06 PA |
4804 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
4805 | { | |
4806 | /* Record the exit code in the convenience variable $_exitcode, so | |
4807 | that the user can inspect this again later. */ | |
4808 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
4809 | (LONGEST) ecs->ws.value.integer); | |
4810 | ||
4811 | /* Also record this in the inferior itself. */ | |
4812 | current_inferior ()->has_exit_code = 1; | |
4813 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 4814 | |
98eb56a4 PA |
4815 | /* Support the --return-child-result option. */ |
4816 | return_child_result_value = ecs->ws.value.integer; | |
4817 | ||
fd664c91 | 4818 | observer_notify_exited (ecs->ws.value.integer); |
940c3c06 PA |
4819 | } |
4820 | else | |
0c557179 SDJ |
4821 | { |
4822 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
4823 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4824 | ||
4825 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
4826 | { | |
4827 | /* Set the value of the internal variable $_exitsignal, | |
4828 | which holds the signal uncaught by the inferior. */ | |
4829 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
4830 | gdbarch_gdb_signal_to_target (gdbarch, | |
4831 | ecs->ws.value.sig)); | |
4832 | } | |
4833 | else | |
4834 | { | |
4835 | /* We don't have access to the target's method used for | |
4836 | converting between signal numbers (GDB's internal | |
4837 | representation <-> target's representation). | |
4838 | Therefore, we cannot do a good job at displaying this | |
4839 | information to the user. It's better to just warn | |
4840 | her about it (if infrun debugging is enabled), and | |
4841 | give up. */ | |
4842 | if (debug_infrun) | |
4843 | fprintf_filtered (gdb_stdlog, _("\ | |
4844 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
4845 | } | |
4846 | ||
fd664c91 | 4847 | observer_notify_signal_exited (ecs->ws.value.sig); |
0c557179 | 4848 | } |
8cf64490 | 4849 | |
488f131b JB |
4850 | gdb_flush (gdb_stdout); |
4851 | target_mourn_inferior (); | |
488f131b | 4852 | stop_print_frame = 0; |
22bcd14b | 4853 | stop_waiting (ecs); |
488f131b | 4854 | return; |
c5aa993b | 4855 | |
488f131b | 4856 | /* The following are the only cases in which we keep going; |
1777feb0 | 4857 | the above cases end in a continue or goto. */ |
488f131b | 4858 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 4859 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 4860 | if (debug_infrun) |
fed708ed PA |
4861 | { |
4862 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
4863 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); | |
4864 | else | |
4865 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_VFORKED\n"); | |
4866 | } | |
c906108c | 4867 | |
e2d96639 YQ |
4868 | /* Check whether the inferior is displaced stepping. */ |
4869 | { | |
4870 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
4871 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4872 | struct displaced_step_inferior_state *displaced | |
4873 | = get_displaced_stepping_state (ptid_get_pid (ecs->ptid)); | |
4874 | ||
4875 | /* If checking displaced stepping is supported, and thread | |
4876 | ecs->ptid is displaced stepping. */ | |
4877 | if (displaced && ptid_equal (displaced->step_ptid, ecs->ptid)) | |
4878 | { | |
4879 | struct inferior *parent_inf | |
c9657e70 | 4880 | = find_inferior_ptid (ecs->ptid); |
e2d96639 YQ |
4881 | struct regcache *child_regcache; |
4882 | CORE_ADDR parent_pc; | |
4883 | ||
4884 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
4885 | indicating that the displaced stepping of syscall instruction | |
4886 | has been done. Perform cleanup for parent process here. Note | |
4887 | that this operation also cleans up the child process for vfork, | |
4888 | because their pages are shared. */ | |
a493e3e2 | 4889 | displaced_step_fixup (ecs->ptid, GDB_SIGNAL_TRAP); |
c2829269 PA |
4890 | /* Start a new step-over in another thread if there's one |
4891 | that needs it. */ | |
4892 | start_step_over (); | |
e2d96639 YQ |
4893 | |
4894 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
4895 | { | |
4896 | /* Restore scratch pad for child process. */ | |
4897 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
4898 | } | |
4899 | ||
4900 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
4901 | the child's PC is also within the scratchpad. Set the child's PC | |
4902 | to the parent's PC value, which has already been fixed up. | |
4903 | FIXME: we use the parent's aspace here, although we're touching | |
4904 | the child, because the child hasn't been added to the inferior | |
4905 | list yet at this point. */ | |
4906 | ||
4907 | child_regcache | |
4908 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
4909 | gdbarch, | |
4910 | parent_inf->aspace); | |
4911 | /* Read PC value of parent process. */ | |
4912 | parent_pc = regcache_read_pc (regcache); | |
4913 | ||
4914 | if (debug_displaced) | |
4915 | fprintf_unfiltered (gdb_stdlog, | |
4916 | "displaced: write child pc from %s to %s\n", | |
4917 | paddress (gdbarch, | |
4918 | regcache_read_pc (child_regcache)), | |
4919 | paddress (gdbarch, parent_pc)); | |
4920 | ||
4921 | regcache_write_pc (child_regcache, parent_pc); | |
4922 | } | |
4923 | } | |
4924 | ||
5a2901d9 | 4925 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 4926 | context_switch (ecs->ptid); |
5a2901d9 | 4927 | |
b242c3c2 PA |
4928 | /* Immediately detach breakpoints from the child before there's |
4929 | any chance of letting the user delete breakpoints from the | |
4930 | breakpoint lists. If we don't do this early, it's easy to | |
4931 | leave left over traps in the child, vis: "break foo; catch | |
4932 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
4933 | the fork on the last `continue', and by that time the | |
4934 | breakpoint at "foo" is long gone from the breakpoint table. | |
4935 | If we vforked, then we don't need to unpatch here, since both | |
4936 | parent and child are sharing the same memory pages; we'll | |
4937 | need to unpatch at follow/detach time instead to be certain | |
4938 | that new breakpoints added between catchpoint hit time and | |
4939 | vfork follow are detached. */ | |
4940 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
4941 | { | |
b242c3c2 PA |
4942 | /* This won't actually modify the breakpoint list, but will |
4943 | physically remove the breakpoints from the child. */ | |
d80ee84f | 4944 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
4945 | } |
4946 | ||
34b7e8a6 | 4947 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 4948 | |
e58b0e63 PA |
4949 | /* In case the event is caught by a catchpoint, remember that |
4950 | the event is to be followed at the next resume of the thread, | |
4951 | and not immediately. */ | |
4952 | ecs->event_thread->pending_follow = ecs->ws; | |
4953 | ||
fb14de7b | 4954 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 4955 | |
16c381f0 | 4956 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 4957 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 4958 | stop_pc, ecs->ptid, &ecs->ws); |
675bf4cb | 4959 | |
ce12b012 PA |
4960 | /* If no catchpoint triggered for this, then keep going. Note |
4961 | that we're interested in knowing the bpstat actually causes a | |
4962 | stop, not just if it may explain the signal. Software | |
4963 | watchpoints, for example, always appear in the bpstat. */ | |
4964 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 4965 | { |
6c95b8df PA |
4966 | ptid_t parent; |
4967 | ptid_t child; | |
e58b0e63 | 4968 | int should_resume; |
3e43a32a MS |
4969 | int follow_child |
4970 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 4971 | |
a493e3e2 | 4972 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 PA |
4973 | |
4974 | should_resume = follow_fork (); | |
4975 | ||
6c95b8df PA |
4976 | parent = ecs->ptid; |
4977 | child = ecs->ws.value.related_pid; | |
4978 | ||
4979 | /* In non-stop mode, also resume the other branch. */ | |
fbea99ea PA |
4980 | if (!detach_fork && (non_stop |
4981 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
4982 | { |
4983 | if (follow_child) | |
4984 | switch_to_thread (parent); | |
4985 | else | |
4986 | switch_to_thread (child); | |
4987 | ||
4988 | ecs->event_thread = inferior_thread (); | |
4989 | ecs->ptid = inferior_ptid; | |
4990 | keep_going (ecs); | |
4991 | } | |
4992 | ||
4993 | if (follow_child) | |
4994 | switch_to_thread (child); | |
4995 | else | |
4996 | switch_to_thread (parent); | |
4997 | ||
e58b0e63 PA |
4998 | ecs->event_thread = inferior_thread (); |
4999 | ecs->ptid = inferior_ptid; | |
5000 | ||
5001 | if (should_resume) | |
5002 | keep_going (ecs); | |
5003 | else | |
22bcd14b | 5004 | stop_waiting (ecs); |
04e68871 DJ |
5005 | return; |
5006 | } | |
94c57d6a PA |
5007 | process_event_stop_test (ecs); |
5008 | return; | |
488f131b | 5009 | |
6c95b8df PA |
5010 | case TARGET_WAITKIND_VFORK_DONE: |
5011 | /* Done with the shared memory region. Re-insert breakpoints in | |
5012 | the parent, and keep going. */ | |
5013 | ||
5014 | if (debug_infrun) | |
3e43a32a MS |
5015 | fprintf_unfiltered (gdb_stdlog, |
5016 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
6c95b8df PA |
5017 | |
5018 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5019 | context_switch (ecs->ptid); | |
5020 | ||
5021 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5022 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
6c95b8df PA |
5023 | /* This also takes care of reinserting breakpoints in the |
5024 | previously locked inferior. */ | |
5025 | keep_going (ecs); | |
5026 | return; | |
5027 | ||
488f131b | 5028 | case TARGET_WAITKIND_EXECD: |
527159b7 | 5029 | if (debug_infrun) |
fc5261f2 | 5030 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 5031 | |
5a2901d9 | 5032 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
c3a01a22 | 5033 | context_switch (ecs->ptid); |
5a2901d9 | 5034 | |
fb14de7b | 5035 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
795e548f | 5036 | |
6c95b8df PA |
5037 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5038 | handle_vfork_child_exec_or_exit (1); | |
5039 | ||
795e548f PA |
5040 | /* This causes the eventpoints and symbol table to be reset. |
5041 | Must do this now, before trying to determine whether to | |
5042 | stop. */ | |
71b43ef8 | 5043 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5044 | |
17d8546e DB |
5045 | /* In follow_exec we may have deleted the original thread and |
5046 | created a new one. Make sure that the event thread is the | |
5047 | execd thread for that case (this is a nop otherwise). */ | |
5048 | ecs->event_thread = inferior_thread (); | |
5049 | ||
16c381f0 | 5050 | ecs->event_thread->control.stop_bpstat |
6c95b8df | 5051 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
09ac7c10 | 5052 | stop_pc, ecs->ptid, &ecs->ws); |
795e548f | 5053 | |
71b43ef8 PA |
5054 | /* Note that this may be referenced from inside |
5055 | bpstat_stop_status above, through inferior_has_execd. */ | |
5056 | xfree (ecs->ws.value.execd_pathname); | |
5057 | ecs->ws.value.execd_pathname = NULL; | |
5058 | ||
04e68871 | 5059 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5060 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5061 | { |
a493e3e2 | 5062 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5063 | keep_going (ecs); |
5064 | return; | |
5065 | } | |
94c57d6a PA |
5066 | process_event_stop_test (ecs); |
5067 | return; | |
488f131b | 5068 | |
b4dc5ffa MK |
5069 | /* Be careful not to try to gather much state about a thread |
5070 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5071 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 5072 | if (debug_infrun) |
3e43a32a MS |
5073 | fprintf_unfiltered (gdb_stdlog, |
5074 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
1777feb0 | 5075 | /* Getting the current syscall number. */ |
94c57d6a PA |
5076 | if (handle_syscall_event (ecs) == 0) |
5077 | process_event_stop_test (ecs); | |
5078 | return; | |
c906108c | 5079 | |
488f131b JB |
5080 | /* Before examining the threads further, step this thread to |
5081 | get it entirely out of the syscall. (We get notice of the | |
5082 | event when the thread is just on the verge of exiting a | |
5083 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5084 | into user code.) */ |
488f131b | 5085 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 5086 | if (debug_infrun) |
3e43a32a MS |
5087 | fprintf_unfiltered (gdb_stdlog, |
5088 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
94c57d6a PA |
5089 | if (handle_syscall_event (ecs) == 0) |
5090 | process_event_stop_test (ecs); | |
5091 | return; | |
c906108c | 5092 | |
488f131b | 5093 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 5094 | if (debug_infrun) |
8a9de0e4 | 5095 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
16c381f0 | 5096 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
4f5d7f63 PA |
5097 | handle_signal_stop (ecs); |
5098 | return; | |
c906108c | 5099 | |
b2175913 | 5100 | case TARGET_WAITKIND_NO_HISTORY: |
4b4e080e PA |
5101 | if (debug_infrun) |
5102 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
b2175913 | 5103 | /* Reverse execution: target ran out of history info. */ |
eab402df | 5104 | |
34b7e8a6 | 5105 | delete_just_stopped_threads_single_step_breakpoints (); |
fb14de7b | 5106 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
fd664c91 | 5107 | observer_notify_no_history (); |
22bcd14b | 5108 | stop_waiting (ecs); |
b2175913 | 5109 | return; |
488f131b | 5110 | } |
4f5d7f63 PA |
5111 | } |
5112 | ||
0b6e5e10 JB |
5113 | /* A wrapper around handle_inferior_event_1, which also makes sure |
5114 | that all temporary struct value objects that were created during | |
5115 | the handling of the event get deleted at the end. */ | |
5116 | ||
5117 | static void | |
5118 | handle_inferior_event (struct execution_control_state *ecs) | |
5119 | { | |
5120 | struct value *mark = value_mark (); | |
5121 | ||
5122 | handle_inferior_event_1 (ecs); | |
5123 | /* Purge all temporary values created during the event handling, | |
5124 | as it could be a long time before we return to the command level | |
5125 | where such values would otherwise be purged. */ | |
5126 | value_free_to_mark (mark); | |
5127 | } | |
5128 | ||
372316f1 PA |
5129 | /* Restart threads back to what they were trying to do back when we |
5130 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5131 | ignored. */ | |
4d9d9d04 PA |
5132 | |
5133 | static void | |
372316f1 PA |
5134 | restart_threads (struct thread_info *event_thread) |
5135 | { | |
5136 | struct thread_info *tp; | |
5137 | struct thread_info *step_over = NULL; | |
5138 | ||
5139 | /* In case the instruction just stepped spawned a new thread. */ | |
5140 | update_thread_list (); | |
5141 | ||
5142 | ALL_NON_EXITED_THREADS (tp) | |
5143 | { | |
5144 | if (tp == event_thread) | |
5145 | { | |
5146 | if (debug_infrun) | |
5147 | fprintf_unfiltered (gdb_stdlog, | |
5148 | "infrun: restart threads: " | |
5149 | "[%s] is event thread\n", | |
5150 | target_pid_to_str (tp->ptid)); | |
5151 | continue; | |
5152 | } | |
5153 | ||
5154 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5155 | { | |
5156 | if (debug_infrun) | |
5157 | fprintf_unfiltered (gdb_stdlog, | |
5158 | "infrun: restart threads: " | |
5159 | "[%s] not meant to be running\n", | |
5160 | target_pid_to_str (tp->ptid)); | |
5161 | continue; | |
5162 | } | |
5163 | ||
5164 | if (tp->resumed) | |
5165 | { | |
5166 | if (debug_infrun) | |
5167 | fprintf_unfiltered (gdb_stdlog, | |
5168 | "infrun: restart threads: [%s] resumed\n", | |
5169 | target_pid_to_str (tp->ptid)); | |
5170 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
5171 | continue; | |
5172 | } | |
5173 | ||
5174 | if (thread_is_in_step_over_chain (tp)) | |
5175 | { | |
5176 | if (debug_infrun) | |
5177 | fprintf_unfiltered (gdb_stdlog, | |
5178 | "infrun: restart threads: " | |
5179 | "[%s] needs step-over\n", | |
5180 | target_pid_to_str (tp->ptid)); | |
5181 | gdb_assert (!tp->resumed); | |
5182 | continue; | |
5183 | } | |
5184 | ||
5185 | ||
5186 | if (tp->suspend.waitstatus_pending_p) | |
5187 | { | |
5188 | if (debug_infrun) | |
5189 | fprintf_unfiltered (gdb_stdlog, | |
5190 | "infrun: restart threads: " | |
5191 | "[%s] has pending status\n", | |
5192 | target_pid_to_str (tp->ptid)); | |
5193 | tp->resumed = 1; | |
5194 | continue; | |
5195 | } | |
5196 | ||
5197 | /* If some thread needs to start a step-over at this point, it | |
5198 | should still be in the step-over queue, and thus skipped | |
5199 | above. */ | |
5200 | if (thread_still_needs_step_over (tp)) | |
5201 | { | |
5202 | internal_error (__FILE__, __LINE__, | |
5203 | "thread [%s] needs a step-over, but not in " | |
5204 | "step-over queue\n", | |
5205 | target_pid_to_str (tp->ptid)); | |
5206 | } | |
5207 | ||
5208 | if (currently_stepping (tp)) | |
5209 | { | |
5210 | if (debug_infrun) | |
5211 | fprintf_unfiltered (gdb_stdlog, | |
5212 | "infrun: restart threads: [%s] was stepping\n", | |
5213 | target_pid_to_str (tp->ptid)); | |
5214 | keep_going_stepped_thread (tp); | |
5215 | } | |
5216 | else | |
5217 | { | |
5218 | struct execution_control_state ecss; | |
5219 | struct execution_control_state *ecs = &ecss; | |
5220 | ||
5221 | if (debug_infrun) | |
5222 | fprintf_unfiltered (gdb_stdlog, | |
5223 | "infrun: restart threads: [%s] continuing\n", | |
5224 | target_pid_to_str (tp->ptid)); | |
5225 | reset_ecs (ecs, tp); | |
5226 | switch_to_thread (tp->ptid); | |
5227 | keep_going_pass_signal (ecs); | |
5228 | } | |
5229 | } | |
5230 | } | |
5231 | ||
5232 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5233 | a pending waitstatus. */ | |
5234 | ||
5235 | static int | |
5236 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5237 | void *arg) | |
5238 | { | |
5239 | return (tp->resumed | |
5240 | && tp->suspend.waitstatus_pending_p); | |
5241 | } | |
5242 | ||
5243 | /* Called when we get an event that may finish an in-line or | |
5244 | out-of-line (displaced stepping) step-over started previously. | |
5245 | Return true if the event is processed and we should go back to the | |
5246 | event loop; false if the caller should continue processing the | |
5247 | event. */ | |
5248 | ||
5249 | static int | |
4d9d9d04 PA |
5250 | finish_step_over (struct execution_control_state *ecs) |
5251 | { | |
372316f1 PA |
5252 | int had_step_over_info; |
5253 | ||
4d9d9d04 PA |
5254 | displaced_step_fixup (ecs->ptid, |
5255 | ecs->event_thread->suspend.stop_signal); | |
5256 | ||
372316f1 PA |
5257 | had_step_over_info = step_over_info_valid_p (); |
5258 | ||
5259 | if (had_step_over_info) | |
4d9d9d04 PA |
5260 | { |
5261 | /* If we're stepping over a breakpoint with all threads locked, | |
5262 | then only the thread that was stepped should be reporting | |
5263 | back an event. */ | |
5264 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5265 | ||
5266 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5267 | clear_step_over_info (); | |
5268 | } | |
5269 | ||
fbea99ea | 5270 | if (!target_is_non_stop_p ()) |
372316f1 | 5271 | return 0; |
4d9d9d04 PA |
5272 | |
5273 | /* Start a new step-over in another thread if there's one that | |
5274 | needs it. */ | |
5275 | start_step_over (); | |
372316f1 PA |
5276 | |
5277 | /* If we were stepping over a breakpoint before, and haven't started | |
5278 | a new in-line step-over sequence, then restart all other threads | |
5279 | (except the event thread). We can't do this in all-stop, as then | |
5280 | e.g., we wouldn't be able to issue any other remote packet until | |
5281 | these other threads stop. */ | |
5282 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5283 | { | |
5284 | struct thread_info *pending; | |
5285 | ||
5286 | /* If we only have threads with pending statuses, the restart | |
5287 | below won't restart any thread and so nothing re-inserts the | |
5288 | breakpoint we just stepped over. But we need it inserted | |
5289 | when we later process the pending events, otherwise if | |
5290 | another thread has a pending event for this breakpoint too, | |
5291 | we'd discard its event (because the breakpoint that | |
5292 | originally caused the event was no longer inserted). */ | |
5293 | context_switch (ecs->ptid); | |
5294 | insert_breakpoints (); | |
5295 | ||
5296 | restart_threads (ecs->event_thread); | |
5297 | ||
5298 | /* If we have events pending, go through handle_inferior_event | |
5299 | again, picking up a pending event at random. This avoids | |
5300 | thread starvation. */ | |
5301 | ||
5302 | /* But not if we just stepped over a watchpoint in order to let | |
5303 | the instruction execute so we can evaluate its expression. | |
5304 | The set of watchpoints that triggered is recorded in the | |
5305 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5306 | If we processed another event first, that other event could | |
5307 | clobber this info. */ | |
5308 | if (ecs->event_thread->stepping_over_watchpoint) | |
5309 | return 0; | |
5310 | ||
5311 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5312 | NULL); | |
5313 | if (pending != NULL) | |
5314 | { | |
5315 | struct thread_info *tp = ecs->event_thread; | |
5316 | struct regcache *regcache; | |
5317 | ||
5318 | if (debug_infrun) | |
5319 | { | |
5320 | fprintf_unfiltered (gdb_stdlog, | |
5321 | "infrun: found resumed threads with " | |
5322 | "pending events, saving status\n"); | |
5323 | } | |
5324 | ||
5325 | gdb_assert (pending != tp); | |
5326 | ||
5327 | /* Record the event thread's event for later. */ | |
5328 | save_waitstatus (tp, &ecs->ws); | |
5329 | /* This was cleared early, by handle_inferior_event. Set it | |
5330 | so this pending event is considered by | |
5331 | do_target_wait. */ | |
5332 | tp->resumed = 1; | |
5333 | ||
5334 | gdb_assert (!tp->executing); | |
5335 | ||
5336 | regcache = get_thread_regcache (tp->ptid); | |
5337 | tp->suspend.stop_pc = regcache_read_pc (regcache); | |
5338 | ||
5339 | if (debug_infrun) | |
5340 | { | |
5341 | fprintf_unfiltered (gdb_stdlog, | |
5342 | "infrun: saved stop_pc=%s for %s " | |
5343 | "(currently_stepping=%d)\n", | |
5344 | paddress (target_gdbarch (), | |
5345 | tp->suspend.stop_pc), | |
5346 | target_pid_to_str (tp->ptid), | |
5347 | currently_stepping (tp)); | |
5348 | } | |
5349 | ||
5350 | /* This in-line step-over finished; clear this so we won't | |
5351 | start a new one. This is what handle_signal_stop would | |
5352 | do, if we returned false. */ | |
5353 | tp->stepping_over_breakpoint = 0; | |
5354 | ||
5355 | /* Wake up the event loop again. */ | |
5356 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5357 | ||
5358 | prepare_to_wait (ecs); | |
5359 | return 1; | |
5360 | } | |
5361 | } | |
5362 | ||
5363 | return 0; | |
4d9d9d04 PA |
5364 | } |
5365 | ||
4f5d7f63 PA |
5366 | /* Come here when the program has stopped with a signal. */ |
5367 | ||
5368 | static void | |
5369 | handle_signal_stop (struct execution_control_state *ecs) | |
5370 | { | |
5371 | struct frame_info *frame; | |
5372 | struct gdbarch *gdbarch; | |
5373 | int stopped_by_watchpoint; | |
5374 | enum stop_kind stop_soon; | |
5375 | int random_signal; | |
c906108c | 5376 | |
f0407826 DE |
5377 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5378 | ||
5379 | /* Do we need to clean up the state of a thread that has | |
5380 | completed a displaced single-step? (Doing so usually affects | |
5381 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5382 | if (finish_step_over (ecs)) |
5383 | return; | |
f0407826 DE |
5384 | |
5385 | /* If we either finished a single-step or hit a breakpoint, but | |
5386 | the user wanted this thread to be stopped, pretend we got a | |
5387 | SIG0 (generic unsignaled stop). */ | |
5388 | if (ecs->event_thread->stop_requested | |
5389 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5390 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5391 | |
515630c5 | 5392 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 5393 | |
527159b7 | 5394 | if (debug_infrun) |
237fc4c9 | 5395 | { |
5af949e3 UW |
5396 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
5397 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7f82dfc7 JK |
5398 | struct cleanup *old_chain = save_inferior_ptid (); |
5399 | ||
5400 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
5401 | |
5402 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
5403 | paddress (gdbarch, stop_pc)); | |
d92524f1 | 5404 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5405 | { |
5406 | CORE_ADDR addr; | |
abbb1732 | 5407 | |
237fc4c9 PA |
5408 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
5409 | ||
5410 | if (target_stopped_data_address (¤t_target, &addr)) | |
5411 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5412 | "infrun: stopped data address = %s\n", |
5413 | paddress (gdbarch, addr)); | |
237fc4c9 PA |
5414 | else |
5415 | fprintf_unfiltered (gdb_stdlog, | |
5416 | "infrun: (no data address available)\n"); | |
5417 | } | |
7f82dfc7 JK |
5418 | |
5419 | do_cleanups (old_chain); | |
237fc4c9 | 5420 | } |
527159b7 | 5421 | |
36fa8042 PA |
5422 | /* This is originated from start_remote(), start_inferior() and |
5423 | shared libraries hook functions. */ | |
5424 | stop_soon = get_inferior_stop_soon (ecs->ptid); | |
5425 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) | |
5426 | { | |
5427 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5428 | context_switch (ecs->ptid); | |
5429 | if (debug_infrun) | |
5430 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
5431 | stop_print_frame = 1; | |
22bcd14b | 5432 | stop_waiting (ecs); |
36fa8042 PA |
5433 | return; |
5434 | } | |
5435 | ||
5436 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5437 | && stop_after_trap) | |
5438 | { | |
5439 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
5440 | context_switch (ecs->ptid); | |
5441 | if (debug_infrun) | |
5442 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
5443 | stop_print_frame = 0; | |
22bcd14b | 5444 | stop_waiting (ecs); |
36fa8042 PA |
5445 | return; |
5446 | } | |
5447 | ||
5448 | /* This originates from attach_command(). We need to overwrite | |
5449 | the stop_signal here, because some kernels don't ignore a | |
5450 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5451 | See more comments in inferior.h. On the other hand, if we | |
5452 | get a non-SIGSTOP, report it to the user - assume the backend | |
5453 | will handle the SIGSTOP if it should show up later. | |
5454 | ||
5455 | Also consider that the attach is complete when we see a | |
5456 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5457 | target extended-remote report it instead of a SIGSTOP | |
5458 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5459 | signal, so this is no exception. | |
5460 | ||
5461 | Also consider that the attach is complete when we see a | |
5462 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5463 | the target to stop all threads of the inferior, in case the | |
5464 | low level attach operation doesn't stop them implicitly. If | |
5465 | they weren't stopped implicitly, then the stub will report a | |
5466 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5467 | other than GDB's request. */ | |
5468 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5469 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5470 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5471 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5472 | { | |
5473 | stop_print_frame = 1; | |
22bcd14b | 5474 | stop_waiting (ecs); |
36fa8042 PA |
5475 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5476 | return; | |
5477 | } | |
5478 | ||
488f131b | 5479 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
5480 | so, then switch to that thread. */ |
5481 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 5482 | { |
527159b7 | 5483 | if (debug_infrun) |
8a9de0e4 | 5484 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 5485 | |
0d1e5fa7 | 5486 | context_switch (ecs->ptid); |
c5aa993b | 5487 | |
9a4105ab AC |
5488 | if (deprecated_context_hook) |
5489 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 5490 | } |
c906108c | 5491 | |
568d6575 UW |
5492 | /* At this point, get hold of the now-current thread's frame. */ |
5493 | frame = get_current_frame (); | |
5494 | gdbarch = get_frame_arch (frame); | |
5495 | ||
2adfaa28 | 5496 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5497 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5498 | { |
af48d08f PA |
5499 | struct regcache *regcache; |
5500 | struct address_space *aspace; | |
5501 | CORE_ADDR pc; | |
2adfaa28 | 5502 | |
af48d08f PA |
5503 | regcache = get_thread_regcache (ecs->ptid); |
5504 | aspace = get_regcache_aspace (regcache); | |
5505 | pc = regcache_read_pc (regcache); | |
34b7e8a6 | 5506 | |
af48d08f PA |
5507 | /* However, before doing so, if this single-step breakpoint was |
5508 | actually for another thread, set this thread up for moving | |
5509 | past it. */ | |
5510 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5511 | aspace, pc)) | |
5512 | { | |
5513 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
5514 | { |
5515 | if (debug_infrun) | |
5516 | { | |
5517 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 5518 | "infrun: [%s] hit another thread's " |
34b7e8a6 PA |
5519 | "single-step breakpoint\n", |
5520 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 | 5521 | } |
af48d08f PA |
5522 | ecs->hit_singlestep_breakpoint = 1; |
5523 | } | |
5524 | } | |
5525 | else | |
5526 | { | |
5527 | if (debug_infrun) | |
5528 | { | |
5529 | fprintf_unfiltered (gdb_stdlog, | |
5530 | "infrun: [%s] hit its " | |
5531 | "single-step breakpoint\n", | |
5532 | target_pid_to_str (ecs->ptid)); | |
2adfaa28 PA |
5533 | } |
5534 | } | |
488f131b | 5535 | } |
af48d08f | 5536 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5537 | |
963f9c80 PA |
5538 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5539 | && ecs->event_thread->control.trap_expected | |
5540 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5541 | stopped_by_watchpoint = 0; |
5542 | else | |
5543 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5544 | ||
5545 | /* If necessary, step over this watchpoint. We'll be back to display | |
5546 | it in a moment. */ | |
5547 | if (stopped_by_watchpoint | |
d92524f1 | 5548 | && (target_have_steppable_watchpoint |
568d6575 | 5549 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5550 | { |
488f131b JB |
5551 | /* At this point, we are stopped at an instruction which has |
5552 | attempted to write to a piece of memory under control of | |
5553 | a watchpoint. The instruction hasn't actually executed | |
5554 | yet. If we were to evaluate the watchpoint expression | |
5555 | now, we would get the old value, and therefore no change | |
5556 | would seem to have occurred. | |
5557 | ||
5558 | In order to make watchpoints work `right', we really need | |
5559 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5560 | watchpoint expression. We do this by single-stepping the |
5561 | target. | |
5562 | ||
7f89fd65 | 5563 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5564 | it. For example, the PA can (with some kernel cooperation) |
5565 | single step over a watchpoint without disabling the watchpoint. | |
5566 | ||
5567 | It is far more common to need to disable a watchpoint to step | |
5568 | the inferior over it. If we have non-steppable watchpoints, | |
5569 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5570 | disable all watchpoints. |
5571 | ||
5572 | Any breakpoint at PC must also be stepped over -- if there's | |
5573 | one, it will have already triggered before the watchpoint | |
5574 | triggered, and we either already reported it to the user, or | |
5575 | it didn't cause a stop and we called keep_going. In either | |
5576 | case, if there was a breakpoint at PC, we must be trying to | |
5577 | step past it. */ | |
5578 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5579 | keep_going (ecs); | |
488f131b JB |
5580 | return; |
5581 | } | |
5582 | ||
4e1c45ea | 5583 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5584 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5585 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5586 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5587 | stop_print_frame = 1; |
488f131b | 5588 | stopped_by_random_signal = 0; |
488f131b | 5589 | |
edb3359d DJ |
5590 | /* Hide inlined functions starting here, unless we just performed stepi or |
5591 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5592 | inline function call sites). */ | |
16c381f0 | 5593 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f GB |
5594 | { |
5595 | struct address_space *aspace = | |
5596 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
5597 | ||
5598 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5599 | determine that the address is one where functions cannot have | |
5600 | been inlined. This improves performance with inferiors that | |
5601 | load a lot of shared libraries, because the solib event | |
5602 | breakpoint is defined as the address of a function (i.e. not | |
5603 | inline). Note that we have to check the previous PC as well | |
5604 | as the current one to catch cases when we have just | |
5605 | single-stepped off a breakpoint prior to reinstating it. | |
5606 | Note that we're assuming that the code we single-step to is | |
5607 | not inline, but that's not definitive: there's nothing | |
5608 | preventing the event breakpoint function from containing | |
5609 | inlined code, and the single-step ending up there. If the | |
5610 | user had set a breakpoint on that inlined code, the missing | |
5611 | skip_inline_frames call would break things. Fortunately | |
5612 | that's an extremely unlikely scenario. */ | |
09ac7c10 | 5613 | if (!pc_at_non_inline_function (aspace, stop_pc, &ecs->ws) |
a210c238 MR |
5614 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5615 | && ecs->event_thread->control.trap_expected | |
5616 | && pc_at_non_inline_function (aspace, | |
5617 | ecs->event_thread->prev_pc, | |
09ac7c10 | 5618 | &ecs->ws))) |
1c5a993e MR |
5619 | { |
5620 | skip_inline_frames (ecs->ptid); | |
5621 | ||
5622 | /* Re-fetch current thread's frame in case that invalidated | |
5623 | the frame cache. */ | |
5624 | frame = get_current_frame (); | |
5625 | gdbarch = get_frame_arch (frame); | |
5626 | } | |
0574c78f | 5627 | } |
edb3359d | 5628 | |
a493e3e2 | 5629 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 5630 | && ecs->event_thread->control.trap_expected |
568d6575 | 5631 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 5632 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 5633 | { |
b50d7442 | 5634 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 5635 | also on an instruction that needs to be stepped multiple |
1777feb0 | 5636 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
5637 | with a delay slot. It needs to be stepped twice, once for |
5638 | the instruction and once for the delay slot. */ | |
5639 | int step_through_delay | |
568d6575 | 5640 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 5641 | |
527159b7 | 5642 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 5643 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
5644 | if (ecs->event_thread->control.step_range_end == 0 |
5645 | && step_through_delay) | |
3352ef37 AC |
5646 | { |
5647 | /* The user issued a continue when stopped at a breakpoint. | |
5648 | Set up for another trap and get out of here. */ | |
4e1c45ea | 5649 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5650 | keep_going (ecs); |
5651 | return; | |
5652 | } | |
5653 | else if (step_through_delay) | |
5654 | { | |
5655 | /* The user issued a step when stopped at a breakpoint. | |
5656 | Maybe we should stop, maybe we should not - the delay | |
5657 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
5658 | case, don't decide that here, just set |
5659 | ecs->stepping_over_breakpoint, making sure we | |
5660 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 5661 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
5662 | } |
5663 | } | |
5664 | ||
ab04a2af TT |
5665 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
5666 | handles this event. */ | |
5667 | ecs->event_thread->control.stop_bpstat | |
5668 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), | |
5669 | stop_pc, ecs->ptid, &ecs->ws); | |
db82e815 | 5670 | |
ab04a2af TT |
5671 | /* Following in case break condition called a |
5672 | function. */ | |
5673 | stop_print_frame = 1; | |
73dd234f | 5674 | |
ab04a2af TT |
5675 | /* This is where we handle "moribund" watchpoints. Unlike |
5676 | software breakpoints traps, hardware watchpoint traps are | |
5677 | always distinguishable from random traps. If no high-level | |
5678 | watchpoint is associated with the reported stop data address | |
5679 | anymore, then the bpstat does not explain the signal --- | |
5680 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
5681 | set. */ | |
5682 | ||
5683 | if (debug_infrun | |
5684 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 5685 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 5686 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
5687 | && stopped_by_watchpoint) |
5688 | fprintf_unfiltered (gdb_stdlog, | |
5689 | "infrun: no user watchpoint explains " | |
5690 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 5691 | |
bac7d97b | 5692 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
5693 | at one stage in the past included checks for an inferior |
5694 | function call's call dummy's return breakpoint. The original | |
5695 | comment, that went with the test, read: | |
03cebad2 | 5696 | |
ab04a2af TT |
5697 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
5698 | another signal besides SIGTRAP, so check here as well as | |
5699 | above.'' | |
73dd234f | 5700 | |
ab04a2af TT |
5701 | If someone ever tries to get call dummys on a |
5702 | non-executable stack to work (where the target would stop | |
5703 | with something like a SIGSEGV), then those tests might need | |
5704 | to be re-instated. Given, however, that the tests were only | |
5705 | enabled when momentary breakpoints were not being used, I | |
5706 | suspect that it won't be the case. | |
488f131b | 5707 | |
ab04a2af TT |
5708 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
5709 | be necessary for call dummies on a non-executable stack on | |
5710 | SPARC. */ | |
488f131b | 5711 | |
bac7d97b | 5712 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
5713 | random_signal |
5714 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
5715 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 5716 | |
1cf4d951 PA |
5717 | /* Maybe this was a trap for a software breakpoint that has since |
5718 | been removed. */ | |
5719 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
5720 | { | |
5721 | if (program_breakpoint_here_p (gdbarch, stop_pc)) | |
5722 | { | |
5723 | struct regcache *regcache; | |
5724 | int decr_pc; | |
5725 | ||
5726 | /* Re-adjust PC to what the program would see if GDB was not | |
5727 | debugging it. */ | |
5728 | regcache = get_thread_regcache (ecs->event_thread->ptid); | |
527a273a | 5729 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
5730 | if (decr_pc != 0) |
5731 | { | |
5732 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, NULL); | |
5733 | ||
5734 | if (record_full_is_used ()) | |
5735 | record_full_gdb_operation_disable_set (); | |
5736 | ||
5737 | regcache_write_pc (regcache, stop_pc + decr_pc); | |
5738 | ||
5739 | do_cleanups (old_cleanups); | |
5740 | } | |
5741 | } | |
5742 | else | |
5743 | { | |
5744 | /* A delayed software breakpoint event. Ignore the trap. */ | |
5745 | if (debug_infrun) | |
5746 | fprintf_unfiltered (gdb_stdlog, | |
5747 | "infrun: delayed software breakpoint " | |
5748 | "trap, ignoring\n"); | |
5749 | random_signal = 0; | |
5750 | } | |
5751 | } | |
5752 | ||
5753 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
5754 | has since been removed. */ | |
5755 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
5756 | { | |
5757 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
5758 | if (debug_infrun) | |
5759 | fprintf_unfiltered (gdb_stdlog, | |
5760 | "infrun: delayed hardware breakpoint/watchpoint " | |
5761 | "trap, ignoring\n"); | |
5762 | random_signal = 0; | |
5763 | } | |
5764 | ||
bac7d97b PA |
5765 | /* If not, perhaps stepping/nexting can. */ |
5766 | if (random_signal) | |
5767 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5768 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 5769 | |
2adfaa28 PA |
5770 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
5771 | thread. Single-step breakpoints are transparent to the | |
5772 | breakpoints module. */ | |
5773 | if (random_signal) | |
5774 | random_signal = !ecs->hit_singlestep_breakpoint; | |
5775 | ||
bac7d97b PA |
5776 | /* No? Perhaps we got a moribund watchpoint. */ |
5777 | if (random_signal) | |
5778 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 5779 | |
488f131b JB |
5780 | /* For the program's own signals, act according to |
5781 | the signal handling tables. */ | |
5782 | ||
ce12b012 | 5783 | if (random_signal) |
488f131b JB |
5784 | { |
5785 | /* Signal not for debugging purposes. */ | |
c9657e70 | 5786 | struct inferior *inf = find_inferior_ptid (ecs->ptid); |
c9737c08 | 5787 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 5788 | |
527159b7 | 5789 | if (debug_infrun) |
c9737c08 PA |
5790 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
5791 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 5792 | |
488f131b JB |
5793 | stopped_by_random_signal = 1; |
5794 | ||
252fbfc8 PA |
5795 | /* Always stop on signals if we're either just gaining control |
5796 | of the program, or the user explicitly requested this thread | |
5797 | to remain stopped. */ | |
d6b48e9c | 5798 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 5799 | || ecs->event_thread->stop_requested |
24291992 | 5800 | || (!inf->detaching |
16c381f0 | 5801 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 5802 | { |
22bcd14b | 5803 | stop_waiting (ecs); |
488f131b JB |
5804 | return; |
5805 | } | |
b57bacec PA |
5806 | |
5807 | /* Notify observers the signal has "handle print" set. Note we | |
5808 | returned early above if stopping; normal_stop handles the | |
5809 | printing in that case. */ | |
5810 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
5811 | { | |
5812 | /* The signal table tells us to print about this signal. */ | |
5813 | target_terminal_ours_for_output (); | |
5814 | observer_notify_signal_received (ecs->event_thread->suspend.stop_signal); | |
5815 | target_terminal_inferior (); | |
5816 | } | |
488f131b JB |
5817 | |
5818 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 5819 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 5820 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 5821 | |
fb14de7b | 5822 | if (ecs->event_thread->prev_pc == stop_pc |
16c381f0 | 5823 | && ecs->event_thread->control.trap_expected |
8358c15c | 5824 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 | 5825 | { |
372316f1 PA |
5826 | int was_in_line; |
5827 | ||
68f53502 AC |
5828 | /* We were just starting a new sequence, attempting to |
5829 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 5830 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
5831 | of the stepping range so GDB needs to remember to, when |
5832 | the signal handler returns, resume stepping off that | |
5833 | breakpoint. */ | |
5834 | /* To simplify things, "continue" is forced to use the same | |
5835 | code paths as single-step - set a breakpoint at the | |
5836 | signal return address and then, once hit, step off that | |
5837 | breakpoint. */ | |
237fc4c9 PA |
5838 | if (debug_infrun) |
5839 | fprintf_unfiltered (gdb_stdlog, | |
5840 | "infrun: signal arrived while stepping over " | |
5841 | "breakpoint\n"); | |
d3169d93 | 5842 | |
372316f1 PA |
5843 | was_in_line = step_over_info_valid_p (); |
5844 | clear_step_over_info (); | |
2c03e5be | 5845 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 5846 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
5847 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
5848 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc | 5849 | |
fbea99ea | 5850 | if (target_is_non_stop_p ()) |
372316f1 | 5851 | { |
fbea99ea PA |
5852 | /* Either "set non-stop" is "on", or the target is |
5853 | always in non-stop mode. In this case, we have a bit | |
5854 | more work to do. Resume the current thread, and if | |
5855 | we had paused all threads, restart them while the | |
5856 | signal handler runs. */ | |
372316f1 PA |
5857 | keep_going (ecs); |
5858 | ||
372316f1 PA |
5859 | if (was_in_line) |
5860 | { | |
372316f1 PA |
5861 | restart_threads (ecs->event_thread); |
5862 | } | |
5863 | else if (debug_infrun) | |
5864 | { | |
5865 | fprintf_unfiltered (gdb_stdlog, | |
5866 | "infrun: no need to restart threads\n"); | |
5867 | } | |
5868 | return; | |
5869 | } | |
5870 | ||
d137e6dc PA |
5871 | /* If we were nexting/stepping some other thread, switch to |
5872 | it, so that we don't continue it, losing control. */ | |
5873 | if (!switch_back_to_stepped_thread (ecs)) | |
5874 | keep_going (ecs); | |
9d799f85 | 5875 | return; |
68f53502 | 5876 | } |
9d799f85 | 5877 | |
e5f8a7cc PA |
5878 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
5879 | && (pc_in_thread_step_range (stop_pc, ecs->event_thread) | |
5880 | || ecs->event_thread->control.step_range_end == 1) | |
edb3359d | 5881 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 5882 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 5883 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
5884 | { |
5885 | /* The inferior is about to take a signal that will take it | |
5886 | out of the single step range. Set a breakpoint at the | |
5887 | current PC (which is presumably where the signal handler | |
5888 | will eventually return) and then allow the inferior to | |
5889 | run free. | |
5890 | ||
5891 | Note that this is only needed for a signal delivered | |
5892 | while in the single-step range. Nested signals aren't a | |
5893 | problem as they eventually all return. */ | |
237fc4c9 PA |
5894 | if (debug_infrun) |
5895 | fprintf_unfiltered (gdb_stdlog, | |
5896 | "infrun: signal may take us out of " | |
5897 | "single-step range\n"); | |
5898 | ||
372316f1 | 5899 | clear_step_over_info (); |
2c03e5be | 5900 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 5901 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
5902 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
5903 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
5904 | keep_going (ecs); |
5905 | return; | |
d303a6c7 | 5906 | } |
9d799f85 AC |
5907 | |
5908 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
5909 | when either there's a nested signal, or when there's a | |
5910 | pending signal enabled just as the signal handler returns | |
5911 | (leaving the inferior at the step-resume-breakpoint without | |
5912 | actually executing it). Either way continue until the | |
5913 | breakpoint is really hit. */ | |
c447ac0b PA |
5914 | |
5915 | if (!switch_back_to_stepped_thread (ecs)) | |
5916 | { | |
5917 | if (debug_infrun) | |
5918 | fprintf_unfiltered (gdb_stdlog, | |
5919 | "infrun: random signal, keep going\n"); | |
5920 | ||
5921 | keep_going (ecs); | |
5922 | } | |
5923 | return; | |
488f131b | 5924 | } |
94c57d6a PA |
5925 | |
5926 | process_event_stop_test (ecs); | |
5927 | } | |
5928 | ||
5929 | /* Come here when we've got some debug event / signal we can explain | |
5930 | (IOW, not a random signal), and test whether it should cause a | |
5931 | stop, or whether we should resume the inferior (transparently). | |
5932 | E.g., could be a breakpoint whose condition evaluates false; we | |
5933 | could be still stepping within the line; etc. */ | |
5934 | ||
5935 | static void | |
5936 | process_event_stop_test (struct execution_control_state *ecs) | |
5937 | { | |
5938 | struct symtab_and_line stop_pc_sal; | |
5939 | struct frame_info *frame; | |
5940 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
5941 | CORE_ADDR jmp_buf_pc; |
5942 | struct bpstat_what what; | |
94c57d6a | 5943 | |
cdaa5b73 | 5944 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 5945 | |
cdaa5b73 PA |
5946 | frame = get_current_frame (); |
5947 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 5948 | |
cdaa5b73 | 5949 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 5950 | |
cdaa5b73 PA |
5951 | if (what.call_dummy) |
5952 | { | |
5953 | stop_stack_dummy = what.call_dummy; | |
5954 | } | |
186c406b | 5955 | |
243a9253 PA |
5956 | /* A few breakpoint types have callbacks associated (e.g., |
5957 | bp_jit_event). Run them now. */ | |
5958 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
5959 | ||
cdaa5b73 PA |
5960 | /* If we hit an internal event that triggers symbol changes, the |
5961 | current frame will be invalidated within bpstat_what (e.g., if we | |
5962 | hit an internal solib event). Re-fetch it. */ | |
5963 | frame = get_current_frame (); | |
5964 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 5965 | |
cdaa5b73 PA |
5966 | switch (what.main_action) |
5967 | { | |
5968 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
5969 | /* If we hit the breakpoint at longjmp while stepping, we | |
5970 | install a momentary breakpoint at the target of the | |
5971 | jmp_buf. */ | |
186c406b | 5972 | |
cdaa5b73 PA |
5973 | if (debug_infrun) |
5974 | fprintf_unfiltered (gdb_stdlog, | |
5975 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 5976 | |
cdaa5b73 | 5977 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 5978 | |
cdaa5b73 PA |
5979 | if (what.is_longjmp) |
5980 | { | |
5981 | struct value *arg_value; | |
5982 | ||
5983 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
5984 | then use it to extract the arguments. The destination PC | |
5985 | is the third argument to the probe. */ | |
5986 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
5987 | if (arg_value) | |
8fa0c4f8 AA |
5988 | { |
5989 | jmp_buf_pc = value_as_address (arg_value); | |
5990 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
5991 | } | |
cdaa5b73 PA |
5992 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
5993 | || !gdbarch_get_longjmp_target (gdbarch, | |
5994 | frame, &jmp_buf_pc)) | |
e2e4d78b | 5995 | { |
cdaa5b73 PA |
5996 | if (debug_infrun) |
5997 | fprintf_unfiltered (gdb_stdlog, | |
5998 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
5999 | "(!gdbarch_get_longjmp_target)\n"); | |
6000 | keep_going (ecs); | |
6001 | return; | |
e2e4d78b | 6002 | } |
e2e4d78b | 6003 | |
cdaa5b73 PA |
6004 | /* Insert a breakpoint at resume address. */ |
6005 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6006 | } | |
6007 | else | |
6008 | check_exception_resume (ecs, frame); | |
6009 | keep_going (ecs); | |
6010 | return; | |
e81a37f7 | 6011 | |
cdaa5b73 PA |
6012 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6013 | { | |
6014 | struct frame_info *init_frame; | |
e81a37f7 | 6015 | |
cdaa5b73 | 6016 | /* There are several cases to consider. |
c906108c | 6017 | |
cdaa5b73 PA |
6018 | 1. The initiating frame no longer exists. In this case we |
6019 | must stop, because the exception or longjmp has gone too | |
6020 | far. | |
2c03e5be | 6021 | |
cdaa5b73 PA |
6022 | 2. The initiating frame exists, and is the same as the |
6023 | current frame. We stop, because the exception or longjmp | |
6024 | has been caught. | |
2c03e5be | 6025 | |
cdaa5b73 PA |
6026 | 3. The initiating frame exists and is different from the |
6027 | current frame. This means the exception or longjmp has | |
6028 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6029 | |
cdaa5b73 PA |
6030 | 4. longjmp breakpoint has been placed just to protect |
6031 | against stale dummy frames and user is not interested in | |
6032 | stopping around longjmps. */ | |
c5aa993b | 6033 | |
cdaa5b73 PA |
6034 | if (debug_infrun) |
6035 | fprintf_unfiltered (gdb_stdlog, | |
6036 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 6037 | |
cdaa5b73 PA |
6038 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6039 | != NULL); | |
6040 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6041 | |
cdaa5b73 PA |
6042 | if (what.is_longjmp) |
6043 | { | |
b67a2c6f | 6044 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6045 | |
cdaa5b73 | 6046 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6047 | { |
cdaa5b73 PA |
6048 | /* Case 4. */ |
6049 | keep_going (ecs); | |
6050 | return; | |
e5ef252a | 6051 | } |
cdaa5b73 | 6052 | } |
c5aa993b | 6053 | |
cdaa5b73 | 6054 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6055 | |
cdaa5b73 PA |
6056 | if (init_frame) |
6057 | { | |
6058 | struct frame_id current_id | |
6059 | = get_frame_id (get_current_frame ()); | |
6060 | if (frame_id_eq (current_id, | |
6061 | ecs->event_thread->initiating_frame)) | |
6062 | { | |
6063 | /* Case 2. Fall through. */ | |
6064 | } | |
6065 | else | |
6066 | { | |
6067 | /* Case 3. */ | |
6068 | keep_going (ecs); | |
6069 | return; | |
6070 | } | |
68f53502 | 6071 | } |
488f131b | 6072 | |
cdaa5b73 PA |
6073 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6074 | exists. */ | |
6075 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6076 | |
bdc36728 | 6077 | end_stepping_range (ecs); |
cdaa5b73 PA |
6078 | } |
6079 | return; | |
e5ef252a | 6080 | |
cdaa5b73 PA |
6081 | case BPSTAT_WHAT_SINGLE: |
6082 | if (debug_infrun) | |
6083 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
6084 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6085 | /* Still need to check other stuff, at least the case where we | |
6086 | are stepping and step out of the right range. */ | |
6087 | break; | |
e5ef252a | 6088 | |
cdaa5b73 PA |
6089 | case BPSTAT_WHAT_STEP_RESUME: |
6090 | if (debug_infrun) | |
6091 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 6092 | |
cdaa5b73 PA |
6093 | delete_step_resume_breakpoint (ecs->event_thread); |
6094 | if (ecs->event_thread->control.proceed_to_finish | |
6095 | && execution_direction == EXEC_REVERSE) | |
6096 | { | |
6097 | struct thread_info *tp = ecs->event_thread; | |
6098 | ||
6099 | /* We are finishing a function in reverse, and just hit the | |
6100 | step-resume breakpoint at the start address of the | |
6101 | function, and we're almost there -- just need to back up | |
6102 | by one more single-step, which should take us back to the | |
6103 | function call. */ | |
6104 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6105 | keep_going (ecs); | |
e5ef252a | 6106 | return; |
cdaa5b73 PA |
6107 | } |
6108 | fill_in_stop_func (gdbarch, ecs); | |
6109 | if (stop_pc == ecs->stop_func_start | |
6110 | && execution_direction == EXEC_REVERSE) | |
6111 | { | |
6112 | /* We are stepping over a function call in reverse, and just | |
6113 | hit the step-resume breakpoint at the start address of | |
6114 | the function. Go back to single-stepping, which should | |
6115 | take us back to the function call. */ | |
6116 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6117 | keep_going (ecs); | |
6118 | return; | |
6119 | } | |
6120 | break; | |
e5ef252a | 6121 | |
cdaa5b73 PA |
6122 | case BPSTAT_WHAT_STOP_NOISY: |
6123 | if (debug_infrun) | |
6124 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
6125 | stop_print_frame = 1; | |
e5ef252a | 6126 | |
99619bea PA |
6127 | /* Assume the thread stopped for a breapoint. We'll still check |
6128 | whether a/the breakpoint is there when the thread is next | |
6129 | resumed. */ | |
6130 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6131 | |
22bcd14b | 6132 | stop_waiting (ecs); |
cdaa5b73 | 6133 | return; |
e5ef252a | 6134 | |
cdaa5b73 PA |
6135 | case BPSTAT_WHAT_STOP_SILENT: |
6136 | if (debug_infrun) | |
6137 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
6138 | stop_print_frame = 0; | |
e5ef252a | 6139 | |
99619bea PA |
6140 | /* Assume the thread stopped for a breapoint. We'll still check |
6141 | whether a/the breakpoint is there when the thread is next | |
6142 | resumed. */ | |
6143 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6144 | stop_waiting (ecs); |
cdaa5b73 PA |
6145 | return; |
6146 | ||
6147 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
6148 | if (debug_infrun) | |
6149 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
6150 | ||
6151 | delete_step_resume_breakpoint (ecs->event_thread); | |
6152 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6153 | { | |
6154 | /* Back when the step-resume breakpoint was inserted, we | |
6155 | were trying to single-step off a breakpoint. Go back to | |
6156 | doing that. */ | |
6157 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6158 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6159 | keep_going (ecs); | |
6160 | return; | |
e5ef252a | 6161 | } |
cdaa5b73 PA |
6162 | break; |
6163 | ||
6164 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6165 | break; | |
e5ef252a | 6166 | } |
c906108c | 6167 | |
af48d08f PA |
6168 | /* If we stepped a permanent breakpoint and we had a high priority |
6169 | step-resume breakpoint for the address we stepped, but we didn't | |
6170 | hit it, then we must have stepped into the signal handler. The | |
6171 | step-resume was only necessary to catch the case of _not_ | |
6172 | stepping into the handler, so delete it, and fall through to | |
6173 | checking whether the step finished. */ | |
6174 | if (ecs->event_thread->stepped_breakpoint) | |
6175 | { | |
6176 | struct breakpoint *sr_bp | |
6177 | = ecs->event_thread->control.step_resume_breakpoint; | |
6178 | ||
8d707a12 PA |
6179 | if (sr_bp != NULL |
6180 | && sr_bp->loc->permanent | |
af48d08f PA |
6181 | && sr_bp->type == bp_hp_step_resume |
6182 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6183 | { | |
6184 | if (debug_infrun) | |
6185 | fprintf_unfiltered (gdb_stdlog, | |
6186 | "infrun: stepped permanent breakpoint, stopped in " | |
6187 | "handler\n"); | |
6188 | delete_step_resume_breakpoint (ecs->event_thread); | |
6189 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6190 | } | |
6191 | } | |
6192 | ||
cdaa5b73 PA |
6193 | /* We come here if we hit a breakpoint but should not stop for it. |
6194 | Possibly we also were stepping and should stop for that. So fall | |
6195 | through and test for stepping. But, if not stepping, do not | |
6196 | stop. */ | |
c906108c | 6197 | |
a7212384 UW |
6198 | /* In all-stop mode, if we're currently stepping but have stopped in |
6199 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6200 | if (switch_back_to_stepped_thread (ecs)) |
6201 | return; | |
776f04fa | 6202 | |
8358c15c | 6203 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6204 | { |
527159b7 | 6205 | if (debug_infrun) |
d3169d93 DJ |
6206 | fprintf_unfiltered (gdb_stdlog, |
6207 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 6208 | |
488f131b JB |
6209 | /* Having a step-resume breakpoint overrides anything |
6210 | else having to do with stepping commands until | |
6211 | that breakpoint is reached. */ | |
488f131b JB |
6212 | keep_going (ecs); |
6213 | return; | |
6214 | } | |
c5aa993b | 6215 | |
16c381f0 | 6216 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6217 | { |
527159b7 | 6218 | if (debug_infrun) |
8a9de0e4 | 6219 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 6220 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6221 | keep_going (ecs); |
6222 | return; | |
6223 | } | |
c5aa993b | 6224 | |
4b7703ad JB |
6225 | /* Re-fetch current thread's frame in case the code above caused |
6226 | the frame cache to be re-initialized, making our FRAME variable | |
6227 | a dangling pointer. */ | |
6228 | frame = get_current_frame (); | |
628fe4e4 | 6229 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6230 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6231 | |
488f131b | 6232 | /* If stepping through a line, keep going if still within it. |
c906108c | 6233 | |
488f131b JB |
6234 | Note that step_range_end is the address of the first instruction |
6235 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6236 | within it! |
6237 | ||
6238 | Note also that during reverse execution, we may be stepping | |
6239 | through a function epilogue and therefore must detect when | |
6240 | the current-frame changes in the middle of a line. */ | |
6241 | ||
ce4c476a | 6242 | if (pc_in_thread_step_range (stop_pc, ecs->event_thread) |
31410e84 | 6243 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6244 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6245 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6246 | { |
527159b7 | 6247 | if (debug_infrun) |
5af949e3 UW |
6248 | fprintf_unfiltered |
6249 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
6250 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
6251 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6252 | |
c1e36e3e PA |
6253 | /* Tentatively re-enable range stepping; `resume' disables it if |
6254 | necessary (e.g., if we're stepping over a breakpoint or we | |
6255 | have software watchpoints). */ | |
6256 | ecs->event_thread->control.may_range_step = 1; | |
6257 | ||
b2175913 MS |
6258 | /* When stepping backward, stop at beginning of line range |
6259 | (unless it's the function entry point, in which case | |
6260 | keep going back to the call point). */ | |
16c381f0 | 6261 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6262 | && stop_pc != ecs->stop_func_start |
6263 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6264 | end_stepping_range (ecs); |
b2175913 MS |
6265 | else |
6266 | keep_going (ecs); | |
6267 | ||
488f131b JB |
6268 | return; |
6269 | } | |
c5aa993b | 6270 | |
488f131b | 6271 | /* We stepped out of the stepping range. */ |
c906108c | 6272 | |
488f131b | 6273 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6274 | loader dynamic symbol resolution code... |
6275 | ||
6276 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6277 | time loader code and reach the callee's address. | |
6278 | ||
6279 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6280 | the runtime loader code is handled just like any other | |
6281 | undebuggable function call. Now we need only keep stepping | |
6282 | backward through the trampoline code, and that's handled further | |
6283 | down, so there is nothing for us to do here. */ | |
6284 | ||
6285 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6286 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
cfd8ab24 | 6287 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 6288 | { |
4c8c40e6 | 6289 | CORE_ADDR pc_after_resolver = |
568d6575 | 6290 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); |
c906108c | 6291 | |
527159b7 | 6292 | if (debug_infrun) |
3e43a32a MS |
6293 | fprintf_unfiltered (gdb_stdlog, |
6294 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 6295 | |
488f131b JB |
6296 | if (pc_after_resolver) |
6297 | { | |
6298 | /* Set up a step-resume breakpoint at the address | |
6299 | indicated by SKIP_SOLIB_RESOLVER. */ | |
6300 | struct symtab_and_line sr_sal; | |
abbb1732 | 6301 | |
fe39c653 | 6302 | init_sal (&sr_sal); |
488f131b | 6303 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6304 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6305 | |
a6d9a66e UW |
6306 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6307 | sr_sal, null_frame_id); | |
c5aa993b | 6308 | } |
c906108c | 6309 | |
488f131b JB |
6310 | keep_going (ecs); |
6311 | return; | |
6312 | } | |
c906108c | 6313 | |
16c381f0 JK |
6314 | if (ecs->event_thread->control.step_range_end != 1 |
6315 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6316 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6317 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6318 | { |
527159b7 | 6319 | if (debug_infrun) |
3e43a32a MS |
6320 | fprintf_unfiltered (gdb_stdlog, |
6321 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 6322 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6323 | a signal trampoline (either by a signal being delivered or by |
6324 | the signal handler returning). Just single-step until the | |
6325 | inferior leaves the trampoline (either by calling the handler | |
6326 | or returning). */ | |
488f131b JB |
6327 | keep_going (ecs); |
6328 | return; | |
6329 | } | |
c906108c | 6330 | |
14132e89 MR |
6331 | /* If we're in the return path from a shared library trampoline, |
6332 | we want to proceed through the trampoline when stepping. */ | |
6333 | /* macro/2012-04-25: This needs to come before the subroutine | |
6334 | call check below as on some targets return trampolines look | |
6335 | like subroutine calls (MIPS16 return thunks). */ | |
6336 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
6337 | stop_pc, ecs->stop_func_name) | |
6338 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) | |
6339 | { | |
6340 | /* Determine where this trampoline returns. */ | |
6341 | CORE_ADDR real_stop_pc; | |
6342 | ||
6343 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
6344 | ||
6345 | if (debug_infrun) | |
6346 | fprintf_unfiltered (gdb_stdlog, | |
6347 | "infrun: stepped into solib return tramp\n"); | |
6348 | ||
6349 | /* Only proceed through if we know where it's going. */ | |
6350 | if (real_stop_pc) | |
6351 | { | |
6352 | /* And put the step-breakpoint there and go until there. */ | |
6353 | struct symtab_and_line sr_sal; | |
6354 | ||
6355 | init_sal (&sr_sal); /* initialize to zeroes */ | |
6356 | sr_sal.pc = real_stop_pc; | |
6357 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6358 | sr_sal.pspace = get_frame_program_space (frame); | |
6359 | ||
6360 | /* Do not specify what the fp should be when we stop since | |
6361 | on some machines the prologue is where the new fp value | |
6362 | is established. */ | |
6363 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6364 | sr_sal, null_frame_id); | |
6365 | ||
6366 | /* Restart without fiddling with the step ranges or | |
6367 | other state. */ | |
6368 | keep_going (ecs); | |
6369 | return; | |
6370 | } | |
6371 | } | |
6372 | ||
c17eaafe DJ |
6373 | /* Check for subroutine calls. The check for the current frame |
6374 | equalling the step ID is not necessary - the check of the | |
6375 | previous frame's ID is sufficient - but it is a common case and | |
6376 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6377 | |
6378 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6379 | being equal, so to get into this block, both the current and | |
6380 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6381 | /* The outer_frame_id check is a heuristic to detect stepping |
6382 | through startup code. If we step over an instruction which | |
6383 | sets the stack pointer from an invalid value to a valid value, | |
6384 | we may detect that as a subroutine call from the mythical | |
6385 | "outermost" function. This could be fixed by marking | |
6386 | outermost frames as !stack_p,code_p,special_p. Then the | |
6387 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6388 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6389 | for more. */ |
edb3359d | 6390 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6391 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6392 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6393 | ecs->event_thread->control.step_stack_frame_id) |
6394 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6395 | outer_frame_id) |
885eeb5b PA |
6396 | || (ecs->event_thread->control.step_start_function |
6397 | != find_pc_function (stop_pc))))) | |
488f131b | 6398 | { |
95918acb | 6399 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6400 | |
527159b7 | 6401 | if (debug_infrun) |
8a9de0e4 | 6402 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 6403 | |
b7a084be | 6404 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6405 | { |
6406 | /* I presume that step_over_calls is only 0 when we're | |
6407 | supposed to be stepping at the assembly language level | |
6408 | ("stepi"). Just stop. */ | |
388a8562 | 6409 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6410 | end_stepping_range (ecs); |
95918acb AC |
6411 | return; |
6412 | } | |
8fb3e588 | 6413 | |
388a8562 MS |
6414 | /* Reverse stepping through solib trampolines. */ |
6415 | ||
6416 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6417 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6418 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6419 | || (ecs->stop_func_start == 0 | |
6420 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6421 | { | |
6422 | /* Any solib trampoline code can be handled in reverse | |
6423 | by simply continuing to single-step. We have already | |
6424 | executed the solib function (backwards), and a few | |
6425 | steps will take us back through the trampoline to the | |
6426 | caller. */ | |
6427 | keep_going (ecs); | |
6428 | return; | |
6429 | } | |
6430 | ||
16c381f0 | 6431 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6432 | { |
b2175913 MS |
6433 | /* We're doing a "next". |
6434 | ||
6435 | Normal (forward) execution: set a breakpoint at the | |
6436 | callee's return address (the address at which the caller | |
6437 | will resume). | |
6438 | ||
6439 | Reverse (backward) execution. set the step-resume | |
6440 | breakpoint at the start of the function that we just | |
6441 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6442 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6443 | |
6444 | if (execution_direction == EXEC_REVERSE) | |
6445 | { | |
acf9414f JK |
6446 | /* If we're already at the start of the function, we've either |
6447 | just stepped backward into a single instruction function, | |
6448 | or stepped back out of a signal handler to the first instruction | |
6449 | of the function. Just keep going, which will single-step back | |
6450 | to the caller. */ | |
58c48e72 | 6451 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f JK |
6452 | { |
6453 | struct symtab_and_line sr_sal; | |
6454 | ||
6455 | /* Normal function call return (static or dynamic). */ | |
6456 | init_sal (&sr_sal); | |
6457 | sr_sal.pc = ecs->stop_func_start; | |
6458 | sr_sal.pspace = get_frame_program_space (frame); | |
6459 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6460 | sr_sal, null_frame_id); | |
6461 | } | |
b2175913 MS |
6462 | } |
6463 | else | |
568d6575 | 6464 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6465 | |
8567c30f AC |
6466 | keep_going (ecs); |
6467 | return; | |
6468 | } | |
a53c66de | 6469 | |
95918acb | 6470 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6471 | calling routine and the real function), locate the real |
6472 | function. That's what tells us (a) whether we want to step | |
6473 | into it at all, and (b) what prologue we want to run to the | |
6474 | end of, if we do step into it. */ | |
568d6575 | 6475 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6476 | if (real_stop_pc == 0) |
568d6575 | 6477 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6478 | if (real_stop_pc != 0) |
6479 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6480 | |
db5f024e | 6481 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 RC |
6482 | { |
6483 | struct symtab_and_line sr_sal; | |
abbb1732 | 6484 | |
1b2bfbb9 RC |
6485 | init_sal (&sr_sal); |
6486 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 6487 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6488 | |
a6d9a66e UW |
6489 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6490 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6491 | keep_going (ecs); |
6492 | return; | |
1b2bfbb9 RC |
6493 | } |
6494 | ||
95918acb | 6495 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6496 | thinking of stepping into and the function isn't on the skip |
6497 | list, step into it. | |
95918acb | 6498 | |
8fb3e588 AC |
6499 | If there are several symtabs at that PC (e.g. with include |
6500 | files), just want to know whether *any* of them have line | |
6501 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6502 | { |
6503 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6504 | |
95918acb | 6505 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6506 | if (tmp_sal.line != 0 |
85817405 JK |
6507 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
6508 | &tmp_sal)) | |
95918acb | 6509 | { |
b2175913 | 6510 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6511 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6512 | else |
568d6575 | 6513 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6514 | return; |
6515 | } | |
6516 | } | |
6517 | ||
6518 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6519 | set, we stop the step so that the user has a chance to switch |
6520 | in assembly mode. */ | |
16c381f0 | 6521 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6522 | && step_stop_if_no_debug) |
95918acb | 6523 | { |
bdc36728 | 6524 | end_stepping_range (ecs); |
95918acb AC |
6525 | return; |
6526 | } | |
6527 | ||
b2175913 MS |
6528 | if (execution_direction == EXEC_REVERSE) |
6529 | { | |
acf9414f JK |
6530 | /* If we're already at the start of the function, we've either just |
6531 | stepped backward into a single instruction function without line | |
6532 | number info, or stepped back out of a signal handler to the first | |
6533 | instruction of the function without line number info. Just keep | |
6534 | going, which will single-step back to the caller. */ | |
6535 | if (ecs->stop_func_start != stop_pc) | |
6536 | { | |
6537 | /* Set a breakpoint at callee's start address. | |
6538 | From there we can step once and be back in the caller. */ | |
6539 | struct symtab_and_line sr_sal; | |
abbb1732 | 6540 | |
acf9414f JK |
6541 | init_sal (&sr_sal); |
6542 | sr_sal.pc = ecs->stop_func_start; | |
6543 | sr_sal.pspace = get_frame_program_space (frame); | |
6544 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6545 | sr_sal, null_frame_id); | |
6546 | } | |
b2175913 MS |
6547 | } |
6548 | else | |
6549 | /* Set a breakpoint at callee's return address (the address | |
6550 | at which the caller will resume). */ | |
568d6575 | 6551 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6552 | |
95918acb | 6553 | keep_going (ecs); |
488f131b | 6554 | return; |
488f131b | 6555 | } |
c906108c | 6556 | |
fdd654f3 MS |
6557 | /* Reverse stepping through solib trampolines. */ |
6558 | ||
6559 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6560 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 MS |
6561 | { |
6562 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
6563 | || (ecs->stop_func_start == 0 | |
6564 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6565 | { | |
6566 | /* Any solib trampoline code can be handled in reverse | |
6567 | by simply continuing to single-step. We have already | |
6568 | executed the solib function (backwards), and a few | |
6569 | steps will take us back through the trampoline to the | |
6570 | caller. */ | |
6571 | keep_going (ecs); | |
6572 | return; | |
6573 | } | |
6574 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6575 | { | |
6576 | /* Stepped backward into the solib dynsym resolver. | |
6577 | Set a breakpoint at its start and continue, then | |
6578 | one more step will take us out. */ | |
6579 | struct symtab_and_line sr_sal; | |
abbb1732 | 6580 | |
fdd654f3 MS |
6581 | init_sal (&sr_sal); |
6582 | sr_sal.pc = ecs->stop_func_start; | |
9d1807c3 | 6583 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6584 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6585 | sr_sal, null_frame_id); | |
6586 | keep_going (ecs); | |
6587 | return; | |
6588 | } | |
6589 | } | |
6590 | ||
2afb61aa | 6591 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 6592 | |
1b2bfbb9 RC |
6593 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6594 | the trampoline processing logic, however, there are some trampolines | |
6595 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6596 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6597 | && ecs->stop_func_name == NULL |
2afb61aa | 6598 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6599 | { |
527159b7 | 6600 | if (debug_infrun) |
3e43a32a MS |
6601 | fprintf_unfiltered (gdb_stdlog, |
6602 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 6603 | |
1b2bfbb9 | 6604 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6605 | undebuggable function (where there is no debugging information |
6606 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6607 | inferior stopped). Since we want to skip this kind of code, |
6608 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6609 | function - unless the user has asked us not to (via |
6610 | set step-mode) or we no longer know how to get back | |
6611 | to the call site. */ | |
6612 | if (step_stop_if_no_debug | |
c7ce8faa | 6613 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6614 | { |
6615 | /* If we have no line number and the step-stop-if-no-debug | |
6616 | is set, we stop the step so that the user has a chance to | |
6617 | switch in assembly mode. */ | |
bdc36728 | 6618 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6619 | return; |
6620 | } | |
6621 | else | |
6622 | { | |
6623 | /* Set a breakpoint at callee's return address (the address | |
6624 | at which the caller will resume). */ | |
568d6575 | 6625 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6626 | keep_going (ecs); |
6627 | return; | |
6628 | } | |
6629 | } | |
6630 | ||
16c381f0 | 6631 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6632 | { |
6633 | /* It is stepi or nexti. We always want to stop stepping after | |
6634 | one instruction. */ | |
527159b7 | 6635 | if (debug_infrun) |
8a9de0e4 | 6636 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 6637 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6638 | return; |
6639 | } | |
6640 | ||
2afb61aa | 6641 | if (stop_pc_sal.line == 0) |
488f131b JB |
6642 | { |
6643 | /* We have no line number information. That means to stop | |
6644 | stepping (does this always happen right after one instruction, | |
6645 | when we do "s" in a function with no line numbers, | |
6646 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 6647 | if (debug_infrun) |
8a9de0e4 | 6648 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 6649 | end_stepping_range (ecs); |
488f131b JB |
6650 | return; |
6651 | } | |
c906108c | 6652 | |
edb3359d DJ |
6653 | /* Look for "calls" to inlined functions, part one. If the inline |
6654 | frame machinery detected some skipped call sites, we have entered | |
6655 | a new inline function. */ | |
6656 | ||
6657 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6658 | ecs->event_thread->control.step_frame_id) |
edb3359d DJ |
6659 | && inline_skipped_frames (ecs->ptid)) |
6660 | { | |
6661 | struct symtab_and_line call_sal; | |
6662 | ||
6663 | if (debug_infrun) | |
6664 | fprintf_unfiltered (gdb_stdlog, | |
6665 | "infrun: stepped into inlined function\n"); | |
6666 | ||
6667 | find_frame_sal (get_current_frame (), &call_sal); | |
6668 | ||
16c381f0 | 6669 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
6670 | { |
6671 | /* For "step", we're going to stop. But if the call site | |
6672 | for this inlined function is on the same source line as | |
6673 | we were previously stepping, go down into the function | |
6674 | first. Otherwise stop at the call site. */ | |
6675 | ||
6676 | if (call_sal.line == ecs->event_thread->current_line | |
6677 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6678 | step_into_inline_frame (ecs->ptid); | |
6679 | ||
bdc36728 | 6680 | end_stepping_range (ecs); |
edb3359d DJ |
6681 | return; |
6682 | } | |
6683 | else | |
6684 | { | |
6685 | /* For "next", we should stop at the call site if it is on a | |
6686 | different source line. Otherwise continue through the | |
6687 | inlined function. */ | |
6688 | if (call_sal.line == ecs->event_thread->current_line | |
6689 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
6690 | keep_going (ecs); | |
6691 | else | |
bdc36728 | 6692 | end_stepping_range (ecs); |
edb3359d DJ |
6693 | return; |
6694 | } | |
6695 | } | |
6696 | ||
6697 | /* Look for "calls" to inlined functions, part two. If we are still | |
6698 | in the same real function we were stepping through, but we have | |
6699 | to go further up to find the exact frame ID, we are stepping | |
6700 | through a more inlined call beyond its call site. */ | |
6701 | ||
6702 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
6703 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6704 | ecs->event_thread->control.step_frame_id) |
edb3359d | 6705 | && stepped_in_from (get_current_frame (), |
16c381f0 | 6706 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
6707 | { |
6708 | if (debug_infrun) | |
6709 | fprintf_unfiltered (gdb_stdlog, | |
6710 | "infrun: stepping through inlined function\n"); | |
6711 | ||
16c381f0 | 6712 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
6713 | keep_going (ecs); |
6714 | else | |
bdc36728 | 6715 | end_stepping_range (ecs); |
edb3359d DJ |
6716 | return; |
6717 | } | |
6718 | ||
2afb61aa | 6719 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
6720 | && (ecs->event_thread->current_line != stop_pc_sal.line |
6721 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
6722 | { |
6723 | /* We are at the start of a different line. So stop. Note that | |
6724 | we don't stop if we step into the middle of a different line. | |
6725 | That is said to make things like for (;;) statements work | |
6726 | better. */ | |
527159b7 | 6727 | if (debug_infrun) |
3e43a32a MS |
6728 | fprintf_unfiltered (gdb_stdlog, |
6729 | "infrun: stepped to a different line\n"); | |
bdc36728 | 6730 | end_stepping_range (ecs); |
488f131b JB |
6731 | return; |
6732 | } | |
c906108c | 6733 | |
488f131b | 6734 | /* We aren't done stepping. |
c906108c | 6735 | |
488f131b JB |
6736 | Optimize by setting the stepping range to the line. |
6737 | (We might not be in the original line, but if we entered a | |
6738 | new line in mid-statement, we continue stepping. This makes | |
6739 | things like for(;;) statements work better.) */ | |
c906108c | 6740 | |
16c381f0 JK |
6741 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
6742 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 6743 | ecs->event_thread->control.may_range_step = 1; |
edb3359d | 6744 | set_step_info (frame, stop_pc_sal); |
488f131b | 6745 | |
527159b7 | 6746 | if (debug_infrun) |
8a9de0e4 | 6747 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 6748 | keep_going (ecs); |
104c1213 JM |
6749 | } |
6750 | ||
c447ac0b PA |
6751 | /* In all-stop mode, if we're currently stepping but have stopped in |
6752 | some other thread, we may need to switch back to the stepped | |
6753 | thread. Returns true we set the inferior running, false if we left | |
6754 | it stopped (and the event needs further processing). */ | |
6755 | ||
6756 | static int | |
6757 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
6758 | { | |
fbea99ea | 6759 | if (!target_is_non_stop_p ()) |
c447ac0b PA |
6760 | { |
6761 | struct thread_info *tp; | |
99619bea PA |
6762 | struct thread_info *stepping_thread; |
6763 | ||
6764 | /* If any thread is blocked on some internal breakpoint, and we | |
6765 | simply need to step over that breakpoint to get it going | |
6766 | again, do that first. */ | |
6767 | ||
6768 | /* However, if we see an event for the stepping thread, then we | |
6769 | know all other threads have been moved past their breakpoints | |
6770 | already. Let the caller check whether the step is finished, | |
6771 | etc., before deciding to move it past a breakpoint. */ | |
6772 | if (ecs->event_thread->control.step_range_end != 0) | |
6773 | return 0; | |
6774 | ||
6775 | /* Check if the current thread is blocked on an incomplete | |
6776 | step-over, interrupted by a random signal. */ | |
6777 | if (ecs->event_thread->control.trap_expected | |
6778 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 6779 | { |
99619bea PA |
6780 | if (debug_infrun) |
6781 | { | |
6782 | fprintf_unfiltered (gdb_stdlog, | |
6783 | "infrun: need to finish step-over of [%s]\n", | |
6784 | target_pid_to_str (ecs->event_thread->ptid)); | |
6785 | } | |
6786 | keep_going (ecs); | |
6787 | return 1; | |
6788 | } | |
2adfaa28 | 6789 | |
99619bea PA |
6790 | /* Check if the current thread is blocked by a single-step |
6791 | breakpoint of another thread. */ | |
6792 | if (ecs->hit_singlestep_breakpoint) | |
6793 | { | |
6794 | if (debug_infrun) | |
6795 | { | |
6796 | fprintf_unfiltered (gdb_stdlog, | |
6797 | "infrun: need to step [%s] over single-step " | |
6798 | "breakpoint\n", | |
6799 | target_pid_to_str (ecs->ptid)); | |
6800 | } | |
6801 | keep_going (ecs); | |
6802 | return 1; | |
6803 | } | |
6804 | ||
4d9d9d04 PA |
6805 | /* If this thread needs yet another step-over (e.g., stepping |
6806 | through a delay slot), do it first before moving on to | |
6807 | another thread. */ | |
6808 | if (thread_still_needs_step_over (ecs->event_thread)) | |
6809 | { | |
6810 | if (debug_infrun) | |
6811 | { | |
6812 | fprintf_unfiltered (gdb_stdlog, | |
6813 | "infrun: thread [%s] still needs step-over\n", | |
6814 | target_pid_to_str (ecs->event_thread->ptid)); | |
6815 | } | |
6816 | keep_going (ecs); | |
6817 | return 1; | |
6818 | } | |
70509625 | 6819 | |
483805cf PA |
6820 | /* If scheduler locking applies even if not stepping, there's no |
6821 | need to walk over threads. Above we've checked whether the | |
6822 | current thread is stepping. If some other thread not the | |
6823 | event thread is stepping, then it must be that scheduler | |
6824 | locking is not in effect. */ | |
856e7dd6 | 6825 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
6826 | return 0; |
6827 | ||
4d9d9d04 PA |
6828 | /* Otherwise, we no longer expect a trap in the current thread. |
6829 | Clear the trap_expected flag before switching back -- this is | |
6830 | what keep_going does as well, if we call it. */ | |
6831 | ecs->event_thread->control.trap_expected = 0; | |
6832 | ||
6833 | /* Likewise, clear the signal if it should not be passed. */ | |
6834 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
6835 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
6836 | ||
6837 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 6838 | step/next/etc. */ |
4d9d9d04 PA |
6839 | if (start_step_over ()) |
6840 | { | |
6841 | prepare_to_wait (ecs); | |
6842 | return 1; | |
6843 | } | |
6844 | ||
6845 | /* Look for the stepping/nexting thread. */ | |
483805cf | 6846 | stepping_thread = NULL; |
4d9d9d04 | 6847 | |
034f788c | 6848 | ALL_NON_EXITED_THREADS (tp) |
483805cf | 6849 | { |
fbea99ea PA |
6850 | /* Ignore threads of processes the caller is not |
6851 | resuming. */ | |
483805cf | 6852 | if (!sched_multi |
1afd5965 | 6853 | && ptid_get_pid (tp->ptid) != ptid_get_pid (ecs->ptid)) |
483805cf PA |
6854 | continue; |
6855 | ||
6856 | /* When stepping over a breakpoint, we lock all threads | |
6857 | except the one that needs to move past the breakpoint. | |
6858 | If a non-event thread has this set, the "incomplete | |
6859 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
6860 | if (tp->control.trap_expected) |
6861 | { | |
6862 | internal_error (__FILE__, __LINE__, | |
6863 | "[%s] has inconsistent state: " | |
6864 | "trap_expected=%d\n", | |
6865 | target_pid_to_str (tp->ptid), | |
6866 | tp->control.trap_expected); | |
6867 | } | |
483805cf PA |
6868 | |
6869 | /* Did we find the stepping thread? */ | |
6870 | if (tp->control.step_range_end) | |
6871 | { | |
6872 | /* Yep. There should only one though. */ | |
6873 | gdb_assert (stepping_thread == NULL); | |
6874 | ||
6875 | /* The event thread is handled at the top, before we | |
6876 | enter this loop. */ | |
6877 | gdb_assert (tp != ecs->event_thread); | |
6878 | ||
6879 | /* If some thread other than the event thread is | |
6880 | stepping, then scheduler locking can't be in effect, | |
6881 | otherwise we wouldn't have resumed the current event | |
6882 | thread in the first place. */ | |
856e7dd6 | 6883 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
6884 | |
6885 | stepping_thread = tp; | |
6886 | } | |
99619bea PA |
6887 | } |
6888 | ||
483805cf | 6889 | if (stepping_thread != NULL) |
99619bea | 6890 | { |
c447ac0b PA |
6891 | if (debug_infrun) |
6892 | fprintf_unfiltered (gdb_stdlog, | |
6893 | "infrun: switching back to stepped thread\n"); | |
6894 | ||
2ac7589c PA |
6895 | if (keep_going_stepped_thread (stepping_thread)) |
6896 | { | |
6897 | prepare_to_wait (ecs); | |
6898 | return 1; | |
6899 | } | |
6900 | } | |
6901 | } | |
2adfaa28 | 6902 | |
2ac7589c PA |
6903 | return 0; |
6904 | } | |
2adfaa28 | 6905 | |
2ac7589c PA |
6906 | /* Set a previously stepped thread back to stepping. Returns true on |
6907 | success, false if the resume is not possible (e.g., the thread | |
6908 | vanished). */ | |
6909 | ||
6910 | static int | |
6911 | keep_going_stepped_thread (struct thread_info *tp) | |
6912 | { | |
6913 | struct frame_info *frame; | |
6914 | struct gdbarch *gdbarch; | |
6915 | struct execution_control_state ecss; | |
6916 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 6917 | |
2ac7589c PA |
6918 | /* If the stepping thread exited, then don't try to switch back and |
6919 | resume it, which could fail in several different ways depending | |
6920 | on the target. Instead, just keep going. | |
2adfaa28 | 6921 | |
2ac7589c PA |
6922 | We can find a stepping dead thread in the thread list in two |
6923 | cases: | |
2adfaa28 | 6924 | |
2ac7589c PA |
6925 | - The target supports thread exit events, and when the target |
6926 | tries to delete the thread from the thread list, inferior_ptid | |
6927 | pointed at the exiting thread. In such case, calling | |
6928 | delete_thread does not really remove the thread from the list; | |
6929 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 6930 | |
2ac7589c PA |
6931 | - The target's debug interface does not support thread exit |
6932 | events, and so we have no idea whatsoever if the previously | |
6933 | stepping thread is still alive. For that reason, we need to | |
6934 | synchronously query the target now. */ | |
2adfaa28 | 6935 | |
2ac7589c PA |
6936 | if (is_exited (tp->ptid) |
6937 | || !target_thread_alive (tp->ptid)) | |
6938 | { | |
6939 | if (debug_infrun) | |
6940 | fprintf_unfiltered (gdb_stdlog, | |
6941 | "infrun: not resuming previously " | |
6942 | "stepped thread, it has vanished\n"); | |
6943 | ||
6944 | delete_thread (tp->ptid); | |
6945 | return 0; | |
c447ac0b | 6946 | } |
2ac7589c PA |
6947 | |
6948 | if (debug_infrun) | |
6949 | fprintf_unfiltered (gdb_stdlog, | |
6950 | "infrun: resuming previously stepped thread\n"); | |
6951 | ||
6952 | reset_ecs (ecs, tp); | |
6953 | switch_to_thread (tp->ptid); | |
6954 | ||
6955 | stop_pc = regcache_read_pc (get_thread_regcache (tp->ptid)); | |
6956 | frame = get_current_frame (); | |
6957 | gdbarch = get_frame_arch (frame); | |
6958 | ||
6959 | /* If the PC of the thread we were trying to single-step has | |
6960 | changed, then that thread has trapped or been signaled, but the | |
6961 | event has not been reported to GDB yet. Re-poll the target | |
6962 | looking for this particular thread's event (i.e. temporarily | |
6963 | enable schedlock) by: | |
6964 | ||
6965 | - setting a break at the current PC | |
6966 | - resuming that particular thread, only (by setting trap | |
6967 | expected) | |
6968 | ||
6969 | This prevents us continuously moving the single-step breakpoint | |
6970 | forward, one instruction at a time, overstepping. */ | |
6971 | ||
6972 | if (stop_pc != tp->prev_pc) | |
6973 | { | |
6974 | ptid_t resume_ptid; | |
6975 | ||
6976 | if (debug_infrun) | |
6977 | fprintf_unfiltered (gdb_stdlog, | |
6978 | "infrun: expected thread advanced also (%s -> %s)\n", | |
6979 | paddress (target_gdbarch (), tp->prev_pc), | |
6980 | paddress (target_gdbarch (), stop_pc)); | |
6981 | ||
6982 | /* Clear the info of the previous step-over, as it's no longer | |
6983 | valid (if the thread was trying to step over a breakpoint, it | |
6984 | has already succeeded). It's what keep_going would do too, | |
6985 | if we called it. Do this before trying to insert the sss | |
6986 | breakpoint, otherwise if we were previously trying to step | |
6987 | over this exact address in another thread, the breakpoint is | |
6988 | skipped. */ | |
6989 | clear_step_over_info (); | |
6990 | tp->control.trap_expected = 0; | |
6991 | ||
6992 | insert_single_step_breakpoint (get_frame_arch (frame), | |
6993 | get_frame_address_space (frame), | |
6994 | stop_pc); | |
6995 | ||
372316f1 | 6996 | tp->resumed = 1; |
fbea99ea | 6997 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
6998 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
6999 | } | |
7000 | else | |
7001 | { | |
7002 | if (debug_infrun) | |
7003 | fprintf_unfiltered (gdb_stdlog, | |
7004 | "infrun: expected thread still hasn't advanced\n"); | |
7005 | ||
7006 | keep_going_pass_signal (ecs); | |
7007 | } | |
7008 | return 1; | |
c447ac0b PA |
7009 | } |
7010 | ||
8b061563 PA |
7011 | /* Is thread TP in the middle of (software or hardware) |
7012 | single-stepping? (Note the result of this function must never be | |
7013 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7014 | |
a289b8f6 | 7015 | static int |
b3444185 | 7016 | currently_stepping (struct thread_info *tp) |
a7212384 | 7017 | { |
8358c15c JK |
7018 | return ((tp->control.step_range_end |
7019 | && tp->control.step_resume_breakpoint == NULL) | |
7020 | || tp->control.trap_expected | |
af48d08f | 7021 | || tp->stepped_breakpoint |
8358c15c | 7022 | || bpstat_should_step ()); |
a7212384 UW |
7023 | } |
7024 | ||
b2175913 MS |
7025 | /* Inferior has stepped into a subroutine call with source code that |
7026 | we should not step over. Do step to the first line of code in | |
7027 | it. */ | |
c2c6d25f JM |
7028 | |
7029 | static void | |
568d6575 UW |
7030 | handle_step_into_function (struct gdbarch *gdbarch, |
7031 | struct execution_control_state *ecs) | |
c2c6d25f | 7032 | { |
43f3e411 | 7033 | struct compunit_symtab *cust; |
2afb61aa | 7034 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f | 7035 | |
7e324e48 GB |
7036 | fill_in_stop_func (gdbarch, ecs); |
7037 | ||
43f3e411 DE |
7038 | cust = find_pc_compunit_symtab (stop_pc); |
7039 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 7040 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 | 7041 | ecs->stop_func_start); |
c2c6d25f | 7042 | |
2afb61aa | 7043 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7044 | /* Use the step_resume_break to step until the end of the prologue, |
7045 | even if that involves jumps (as it seems to on the vax under | |
7046 | 4.2). */ | |
7047 | /* If the prologue ends in the middle of a source line, continue to | |
7048 | the end of that source line (if it is still within the function). | |
7049 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7050 | if (stop_func_sal.end |
7051 | && stop_func_sal.pc != ecs->stop_func_start | |
7052 | && stop_func_sal.end < ecs->stop_func_end) | |
7053 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7054 | |
2dbd5e30 KB |
7055 | /* Architectures which require breakpoint adjustment might not be able |
7056 | to place a breakpoint at the computed address. If so, the test | |
7057 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7058 | ecs->stop_func_start to an address at which a breakpoint may be | |
7059 | legitimately placed. | |
8fb3e588 | 7060 | |
2dbd5e30 KB |
7061 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7062 | made, GDB will enter an infinite loop when stepping through | |
7063 | optimized code consisting of VLIW instructions which contain | |
7064 | subinstructions corresponding to different source lines. On | |
7065 | FR-V, it's not permitted to place a breakpoint on any but the | |
7066 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7067 | set, GDB will adjust the breakpoint address to the beginning of | |
7068 | the VLIW instruction. Thus, we need to make the corresponding | |
7069 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7070 | |
568d6575 | 7071 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7072 | { |
7073 | ecs->stop_func_start | |
568d6575 | 7074 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7075 | ecs->stop_func_start); |
2dbd5e30 KB |
7076 | } |
7077 | ||
c2c6d25f JM |
7078 | if (ecs->stop_func_start == stop_pc) |
7079 | { | |
7080 | /* We are already there: stop now. */ | |
bdc36728 | 7081 | end_stepping_range (ecs); |
c2c6d25f JM |
7082 | return; |
7083 | } | |
7084 | else | |
7085 | { | |
7086 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 7087 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
7088 | sr_sal.pc = ecs->stop_func_start; |
7089 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7090 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7091 | |
c2c6d25f | 7092 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7093 | some machines the prologue is where the new fp value is |
7094 | established. */ | |
a6d9a66e | 7095 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7096 | |
7097 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7098 | ecs->event_thread->control.step_range_end |
7099 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7100 | } |
7101 | keep_going (ecs); | |
7102 | } | |
d4f3574e | 7103 | |
b2175913 MS |
7104 | /* Inferior has stepped backward into a subroutine call with source |
7105 | code that we should not step over. Do step to the beginning of the | |
7106 | last line of code in it. */ | |
7107 | ||
7108 | static void | |
568d6575 UW |
7109 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7110 | struct execution_control_state *ecs) | |
b2175913 | 7111 | { |
43f3e411 | 7112 | struct compunit_symtab *cust; |
167e4384 | 7113 | struct symtab_and_line stop_func_sal; |
b2175913 | 7114 | |
7e324e48 GB |
7115 | fill_in_stop_func (gdbarch, ecs); |
7116 | ||
43f3e411 DE |
7117 | cust = find_pc_compunit_symtab (stop_pc); |
7118 | if (cust != NULL && compunit_language (cust) != language_asm) | |
568d6575 | 7119 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 MS |
7120 | ecs->stop_func_start); |
7121 | ||
7122 | stop_func_sal = find_pc_line (stop_pc, 0); | |
7123 | ||
7124 | /* OK, we're just going to keep stepping here. */ | |
7125 | if (stop_func_sal.pc == stop_pc) | |
7126 | { | |
7127 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7128 | end_stepping_range (ecs); |
b2175913 MS |
7129 | } |
7130 | else | |
7131 | { | |
7132 | /* Else just reset the step range and keep going. | |
7133 | No step-resume breakpoint, they don't work for | |
7134 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7135 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7136 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7137 | keep_going (ecs); |
7138 | } | |
7139 | return; | |
7140 | } | |
7141 | ||
d3169d93 | 7142 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7143 | This is used to both functions and to skip over code. */ |
7144 | ||
7145 | static void | |
2c03e5be PA |
7146 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7147 | struct symtab_and_line sr_sal, | |
7148 | struct frame_id sr_id, | |
7149 | enum bptype sr_type) | |
44cbf7b5 | 7150 | { |
611c83ae PA |
7151 | /* There should never be more than one step-resume or longjmp-resume |
7152 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7153 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7154 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7155 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
7156 | |
7157 | if (debug_infrun) | |
7158 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7159 | "infrun: inserting step-resume breakpoint at %s\n", |
7160 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7161 | |
8358c15c | 7162 | inferior_thread ()->control.step_resume_breakpoint |
2c03e5be PA |
7163 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type); |
7164 | } | |
7165 | ||
9da8c2a0 | 7166 | void |
2c03e5be PA |
7167 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7168 | struct symtab_and_line sr_sal, | |
7169 | struct frame_id sr_id) | |
7170 | { | |
7171 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7172 | sr_sal, sr_id, | |
7173 | bp_step_resume); | |
44cbf7b5 | 7174 | } |
7ce450bd | 7175 | |
2c03e5be PA |
7176 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7177 | This is used to skip a potential signal handler. | |
7ce450bd | 7178 | |
14e60db5 DJ |
7179 | This is called with the interrupted function's frame. The signal |
7180 | handler, when it returns, will resume the interrupted function at | |
7181 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7182 | |
7183 | static void | |
2c03e5be | 7184 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
7185 | { |
7186 | struct symtab_and_line sr_sal; | |
a6d9a66e | 7187 | struct gdbarch *gdbarch; |
d303a6c7 | 7188 | |
f4c1edd8 | 7189 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
7190 | init_sal (&sr_sal); /* initialize to zeros */ |
7191 | ||
a6d9a66e | 7192 | gdbarch = get_frame_arch (return_frame); |
568d6575 | 7193 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7194 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7195 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7196 | |
2c03e5be PA |
7197 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7198 | get_stack_frame_id (return_frame), | |
7199 | bp_hp_step_resume); | |
d303a6c7 AC |
7200 | } |
7201 | ||
2c03e5be PA |
7202 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7203 | is used to skip a function after stepping into it (for "next" or if | |
7204 | the called function has no debugging information). | |
14e60db5 DJ |
7205 | |
7206 | The current function has almost always been reached by single | |
7207 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7208 | current function, and the breakpoint will be set at the caller's | |
7209 | resume address. | |
7210 | ||
7211 | This is a separate function rather than reusing | |
2c03e5be | 7212 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7213 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7214 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7215 | |
7216 | static void | |
7217 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7218 | { | |
7219 | struct symtab_and_line sr_sal; | |
a6d9a66e | 7220 | struct gdbarch *gdbarch; |
14e60db5 DJ |
7221 | |
7222 | /* We shouldn't have gotten here if we don't know where the call site | |
7223 | is. */ | |
c7ce8faa | 7224 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 DJ |
7225 | |
7226 | init_sal (&sr_sal); /* initialize to zeros */ | |
7227 | ||
a6d9a66e | 7228 | gdbarch = frame_unwind_caller_arch (next_frame); |
c7ce8faa DJ |
7229 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7230 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7231 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7232 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7233 | |
a6d9a66e | 7234 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7235 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7236 | } |
7237 | ||
611c83ae PA |
7238 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7239 | new breakpoint at the target of a jmp_buf. The handling of | |
7240 | longjmp-resume uses the same mechanisms used for handling | |
7241 | "step-resume" breakpoints. */ | |
7242 | ||
7243 | static void | |
a6d9a66e | 7244 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7245 | { |
e81a37f7 TT |
7246 | /* There should never be more than one longjmp-resume breakpoint per |
7247 | thread, so we should never be setting a new | |
611c83ae | 7248 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7249 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
7250 | |
7251 | if (debug_infrun) | |
7252 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7253 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
7254 | paddress (gdbarch, pc)); | |
611c83ae | 7255 | |
e81a37f7 | 7256 | inferior_thread ()->control.exception_resume_breakpoint = |
a6d9a66e | 7257 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); |
611c83ae PA |
7258 | } |
7259 | ||
186c406b TT |
7260 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7261 | the exception. The block B is the block of the unwinder debug hook | |
7262 | function. FRAME is the frame corresponding to the call to this | |
7263 | function. SYM is the symbol of the function argument holding the | |
7264 | target PC of the exception. */ | |
7265 | ||
7266 | static void | |
7267 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7268 | const struct block *b, |
186c406b TT |
7269 | struct frame_info *frame, |
7270 | struct symbol *sym) | |
7271 | { | |
492d29ea | 7272 | TRY |
186c406b | 7273 | { |
63e43d3a | 7274 | struct block_symbol vsym; |
186c406b TT |
7275 | struct value *value; |
7276 | CORE_ADDR handler; | |
7277 | struct breakpoint *bp; | |
7278 | ||
63e43d3a PMR |
7279 | vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL); |
7280 | value = read_var_value (vsym.symbol, vsym.block, frame); | |
186c406b TT |
7281 | /* If the value was optimized out, revert to the old behavior. */ |
7282 | if (! value_optimized_out (value)) | |
7283 | { | |
7284 | handler = value_as_address (value); | |
7285 | ||
7286 | if (debug_infrun) | |
7287 | fprintf_unfiltered (gdb_stdlog, | |
7288 | "infrun: exception resume at %lx\n", | |
7289 | (unsigned long) handler); | |
7290 | ||
7291 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7292 | handler, bp_exception_resume); | |
c70a6932 JK |
7293 | |
7294 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7295 | frame = NULL; | |
7296 | ||
186c406b TT |
7297 | bp->thread = tp->num; |
7298 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
7299 | } | |
7300 | } | |
492d29ea PA |
7301 | CATCH (e, RETURN_MASK_ERROR) |
7302 | { | |
7303 | /* We want to ignore errors here. */ | |
7304 | } | |
7305 | END_CATCH | |
186c406b TT |
7306 | } |
7307 | ||
28106bc2 SDJ |
7308 | /* A helper for check_exception_resume that sets an |
7309 | exception-breakpoint based on a SystemTap probe. */ | |
7310 | ||
7311 | static void | |
7312 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7313 | const struct bound_probe *probe, |
28106bc2 SDJ |
7314 | struct frame_info *frame) |
7315 | { | |
7316 | struct value *arg_value; | |
7317 | CORE_ADDR handler; | |
7318 | struct breakpoint *bp; | |
7319 | ||
7320 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7321 | if (!arg_value) | |
7322 | return; | |
7323 | ||
7324 | handler = value_as_address (arg_value); | |
7325 | ||
7326 | if (debug_infrun) | |
7327 | fprintf_unfiltered (gdb_stdlog, | |
7328 | "infrun: exception resume at %s\n", | |
6bac7473 | 7329 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
7330 | handler)); |
7331 | ||
7332 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
7333 | handler, bp_exception_resume); | |
7334 | bp->thread = tp->num; | |
7335 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
7336 | } | |
7337 | ||
186c406b TT |
7338 | /* This is called when an exception has been intercepted. Check to |
7339 | see whether the exception's destination is of interest, and if so, | |
7340 | set an exception resume breakpoint there. */ | |
7341 | ||
7342 | static void | |
7343 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7344 | struct frame_info *frame) |
186c406b | 7345 | { |
729662a5 | 7346 | struct bound_probe probe; |
28106bc2 SDJ |
7347 | struct symbol *func; |
7348 | ||
7349 | /* First see if this exception unwinding breakpoint was set via a | |
7350 | SystemTap probe point. If so, the probe has two arguments: the | |
7351 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7352 | set a breakpoint there. */ | |
6bac7473 | 7353 | probe = find_probe_by_pc (get_frame_pc (frame)); |
729662a5 | 7354 | if (probe.probe) |
28106bc2 | 7355 | { |
729662a5 | 7356 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7357 | return; |
7358 | } | |
7359 | ||
7360 | func = get_frame_function (frame); | |
7361 | if (!func) | |
7362 | return; | |
186c406b | 7363 | |
492d29ea | 7364 | TRY |
186c406b | 7365 | { |
3977b71f | 7366 | const struct block *b; |
8157b174 | 7367 | struct block_iterator iter; |
186c406b TT |
7368 | struct symbol *sym; |
7369 | int argno = 0; | |
7370 | ||
7371 | /* The exception breakpoint is a thread-specific breakpoint on | |
7372 | the unwinder's debug hook, declared as: | |
7373 | ||
7374 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7375 | ||
7376 | The CFA argument indicates the frame to which control is | |
7377 | about to be transferred. HANDLER is the destination PC. | |
7378 | ||
7379 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7380 | This is not extremely efficient but it avoids issues in gdb | |
7381 | with computing the DWARF CFA, and it also works even in weird | |
7382 | cases such as throwing an exception from inside a signal | |
7383 | handler. */ | |
7384 | ||
7385 | b = SYMBOL_BLOCK_VALUE (func); | |
7386 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7387 | { | |
7388 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7389 | continue; | |
7390 | ||
7391 | if (argno == 0) | |
7392 | ++argno; | |
7393 | else | |
7394 | { | |
7395 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7396 | b, frame, sym); | |
7397 | break; | |
7398 | } | |
7399 | } | |
7400 | } | |
492d29ea PA |
7401 | CATCH (e, RETURN_MASK_ERROR) |
7402 | { | |
7403 | } | |
7404 | END_CATCH | |
186c406b TT |
7405 | } |
7406 | ||
104c1213 | 7407 | static void |
22bcd14b | 7408 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7409 | { |
527159b7 | 7410 | if (debug_infrun) |
22bcd14b | 7411 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 7412 | |
31e77af2 PA |
7413 | clear_step_over_info (); |
7414 | ||
cd0fc7c3 SS |
7415 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7416 | ecs->wait_some_more = 0; | |
fbea99ea PA |
7417 | |
7418 | /* If all-stop, but the target is always in non-stop mode, stop all | |
7419 | threads now that we're presenting the stop to the user. */ | |
7420 | if (!non_stop && target_is_non_stop_p ()) | |
7421 | stop_all_threads (); | |
cd0fc7c3 SS |
7422 | } |
7423 | ||
4d9d9d04 PA |
7424 | /* Like keep_going, but passes the signal to the inferior, even if the |
7425 | signal is set to nopass. */ | |
d4f3574e SS |
7426 | |
7427 | static void | |
4d9d9d04 | 7428 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7429 | { |
c4dbc9af PA |
7430 | /* Make sure normal_stop is called if we get a QUIT handled before |
7431 | reaching resume. */ | |
7432 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
7433 | ||
4d9d9d04 | 7434 | gdb_assert (ptid_equal (ecs->event_thread->ptid, inferior_ptid)); |
372316f1 | 7435 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7436 | |
d4f3574e | 7437 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
7438 | ecs->event_thread->prev_pc |
7439 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 7440 | |
4d9d9d04 | 7441 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7442 | { |
4d9d9d04 PA |
7443 | struct thread_info *tp = ecs->event_thread; |
7444 | ||
7445 | if (debug_infrun) | |
7446 | fprintf_unfiltered (gdb_stdlog, | |
7447 | "infrun: %s has trap_expected set, " | |
7448 | "resuming to collect trap\n", | |
7449 | target_pid_to_str (tp->ptid)); | |
7450 | ||
a9ba6bae PA |
7451 | /* We haven't yet gotten our trap, and either: intercepted a |
7452 | non-signal event (e.g., a fork); or took a signal which we | |
7453 | are supposed to pass through to the inferior. Simply | |
7454 | continue. */ | |
c4dbc9af | 7455 | discard_cleanups (old_cleanups); |
64ce06e4 | 7456 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7457 | } |
372316f1 PA |
7458 | else if (step_over_info_valid_p ()) |
7459 | { | |
7460 | /* Another thread is stepping over a breakpoint in-line. If | |
7461 | this thread needs a step-over too, queue the request. In | |
7462 | either case, this resume must be deferred for later. */ | |
7463 | struct thread_info *tp = ecs->event_thread; | |
7464 | ||
7465 | if (ecs->hit_singlestep_breakpoint | |
7466 | || thread_still_needs_step_over (tp)) | |
7467 | { | |
7468 | if (debug_infrun) | |
7469 | fprintf_unfiltered (gdb_stdlog, | |
7470 | "infrun: step-over already in progress: " | |
7471 | "step-over for %s deferred\n", | |
7472 | target_pid_to_str (tp->ptid)); | |
7473 | thread_step_over_chain_enqueue (tp); | |
7474 | } | |
7475 | else | |
7476 | { | |
7477 | if (debug_infrun) | |
7478 | fprintf_unfiltered (gdb_stdlog, | |
7479 | "infrun: step-over in progress: " | |
7480 | "resume of %s deferred\n", | |
7481 | target_pid_to_str (tp->ptid)); | |
7482 | } | |
7483 | ||
7484 | discard_cleanups (old_cleanups); | |
7485 | } | |
d4f3574e SS |
7486 | else |
7487 | { | |
31e77af2 | 7488 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7489 | int remove_bp; |
7490 | int remove_wps; | |
6c4cfb24 | 7491 | enum step_over_what step_what; |
31e77af2 | 7492 | |
d4f3574e | 7493 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7494 | anyway (if we got a signal, the user asked it be passed to |
7495 | the child) | |
7496 | -- or -- | |
7497 | We got our expected trap, but decided we should resume from | |
7498 | it. | |
d4f3574e | 7499 | |
a9ba6bae | 7500 | We're going to run this baby now! |
d4f3574e | 7501 | |
c36b740a VP |
7502 | Note that insert_breakpoints won't try to re-insert |
7503 | already inserted breakpoints. Therefore, we don't | |
7504 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7505 | |
31e77af2 PA |
7506 | /* If we need to step over a breakpoint, and we're not using |
7507 | displaced stepping to do so, insert all breakpoints | |
7508 | (watchpoints, etc.) but the one we're stepping over, step one | |
7509 | instruction, and then re-insert the breakpoint when that step | |
7510 | is finished. */ | |
963f9c80 | 7511 | |
6c4cfb24 PA |
7512 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7513 | ||
963f9c80 | 7514 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7515 | || (step_what & STEP_OVER_BREAKPOINT)); |
7516 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7517 | |
cb71640d PA |
7518 | /* We can't use displaced stepping if we need to step past a |
7519 | watchpoint. The instruction copied to the scratch pad would | |
7520 | still trigger the watchpoint. */ | |
7521 | if (remove_bp | |
3fc8eb30 | 7522 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7523 | { |
31e77af2 | 7524 | set_step_over_info (get_regcache_aspace (regcache), |
963f9c80 | 7525 | regcache_read_pc (regcache), remove_wps); |
45e8c884 | 7526 | } |
963f9c80 PA |
7527 | else if (remove_wps) |
7528 | set_step_over_info (NULL, 0, remove_wps); | |
372316f1 PA |
7529 | |
7530 | /* If we now need to do an in-line step-over, we need to stop | |
7531 | all other threads. Note this must be done before | |
7532 | insert_breakpoints below, because that removes the breakpoint | |
7533 | we're about to step over, otherwise other threads could miss | |
7534 | it. */ | |
fbea99ea | 7535 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7536 | stop_all_threads (); |
abbb1732 | 7537 | |
31e77af2 | 7538 | /* Stop stepping if inserting breakpoints fails. */ |
492d29ea | 7539 | TRY |
31e77af2 PA |
7540 | { |
7541 | insert_breakpoints (); | |
7542 | } | |
492d29ea | 7543 | CATCH (e, RETURN_MASK_ERROR) |
31e77af2 PA |
7544 | { |
7545 | exception_print (gdb_stderr, e); | |
22bcd14b | 7546 | stop_waiting (ecs); |
de1fe8c8 | 7547 | discard_cleanups (old_cleanups); |
31e77af2 | 7548 | return; |
d4f3574e | 7549 | } |
492d29ea | 7550 | END_CATCH |
d4f3574e | 7551 | |
963f9c80 | 7552 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7553 | |
c4dbc9af | 7554 | discard_cleanups (old_cleanups); |
64ce06e4 | 7555 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7556 | } |
7557 | ||
488f131b | 7558 | prepare_to_wait (ecs); |
d4f3574e SS |
7559 | } |
7560 | ||
4d9d9d04 PA |
7561 | /* Called when we should continue running the inferior, because the |
7562 | current event doesn't cause a user visible stop. This does the | |
7563 | resuming part; waiting for the next event is done elsewhere. */ | |
7564 | ||
7565 | static void | |
7566 | keep_going (struct execution_control_state *ecs) | |
7567 | { | |
7568 | if (ecs->event_thread->control.trap_expected | |
7569 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7570 | ecs->event_thread->control.trap_expected = 0; | |
7571 | ||
7572 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7573 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7574 | keep_going_pass_signal (ecs); | |
7575 | } | |
7576 | ||
104c1213 JM |
7577 | /* This function normally comes after a resume, before |
7578 | handle_inferior_event exits. It takes care of any last bits of | |
7579 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7580 | |
104c1213 JM |
7581 | static void |
7582 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7583 | { |
527159b7 | 7584 | if (debug_infrun) |
8a9de0e4 | 7585 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 7586 | |
104c1213 | 7587 | ecs->wait_some_more = 1; |
0b333c5e PA |
7588 | |
7589 | if (!target_is_async_p ()) | |
7590 | mark_infrun_async_event_handler (); | |
c906108c | 7591 | } |
11cf8741 | 7592 | |
fd664c91 | 7593 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7594 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7595 | |
7596 | static void | |
bdc36728 | 7597 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7598 | { |
bdc36728 | 7599 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7600 | stop_waiting (ecs); |
fd664c91 PA |
7601 | } |
7602 | ||
33d62d64 JK |
7603 | /* Several print_*_reason functions to print why the inferior has stopped. |
7604 | We always print something when the inferior exits, or receives a signal. | |
7605 | The rest of the cases are dealt with later on in normal_stop and | |
7606 | print_it_typical. Ideally there should be a call to one of these | |
7607 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7608 | stop_waiting is called. |
33d62d64 | 7609 | |
fd664c91 PA |
7610 | Note that we don't call these directly, instead we delegate that to |
7611 | the interpreters, through observers. Interpreters then call these | |
7612 | with whatever uiout is right. */ | |
33d62d64 | 7613 | |
fd664c91 PA |
7614 | void |
7615 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7616 | { |
fd664c91 | 7617 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7618 | |
fd664c91 PA |
7619 | if (ui_out_is_mi_like_p (uiout)) |
7620 | { | |
7621 | ui_out_field_string (uiout, "reason", | |
7622 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
7623 | } | |
7624 | } | |
33d62d64 | 7625 | |
fd664c91 PA |
7626 | void |
7627 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7628 | { |
33d62d64 JK |
7629 | annotate_signalled (); |
7630 | if (ui_out_is_mi_like_p (uiout)) | |
7631 | ui_out_field_string | |
7632 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7633 | ui_out_text (uiout, "\nProgram terminated with signal "); | |
7634 | annotate_signal_name (); | |
7635 | ui_out_field_string (uiout, "signal-name", | |
2ea28649 | 7636 | gdb_signal_to_name (siggnal)); |
33d62d64 JK |
7637 | annotate_signal_name_end (); |
7638 | ui_out_text (uiout, ", "); | |
7639 | annotate_signal_string (); | |
7640 | ui_out_field_string (uiout, "signal-meaning", | |
2ea28649 | 7641 | gdb_signal_to_string (siggnal)); |
33d62d64 JK |
7642 | annotate_signal_string_end (); |
7643 | ui_out_text (uiout, ".\n"); | |
7644 | ui_out_text (uiout, "The program no longer exists.\n"); | |
7645 | } | |
7646 | ||
fd664c91 PA |
7647 | void |
7648 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7649 | { |
fda326dd TT |
7650 | struct inferior *inf = current_inferior (); |
7651 | const char *pidstr = target_pid_to_str (pid_to_ptid (inf->pid)); | |
7652 | ||
33d62d64 JK |
7653 | annotate_exited (exitstatus); |
7654 | if (exitstatus) | |
7655 | { | |
7656 | if (ui_out_is_mi_like_p (uiout)) | |
7657 | ui_out_field_string (uiout, "reason", | |
7658 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
fda326dd TT |
7659 | ui_out_text (uiout, "[Inferior "); |
7660 | ui_out_text (uiout, plongest (inf->num)); | |
7661 | ui_out_text (uiout, " ("); | |
7662 | ui_out_text (uiout, pidstr); | |
7663 | ui_out_text (uiout, ") exited with code "); | |
33d62d64 | 7664 | ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) exitstatus); |
fda326dd | 7665 | ui_out_text (uiout, "]\n"); |
33d62d64 JK |
7666 | } |
7667 | else | |
11cf8741 | 7668 | { |
9dc5e2a9 | 7669 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f | 7670 | ui_out_field_string |
33d62d64 | 7671 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); |
fda326dd TT |
7672 | ui_out_text (uiout, "[Inferior "); |
7673 | ui_out_text (uiout, plongest (inf->num)); | |
7674 | ui_out_text (uiout, " ("); | |
7675 | ui_out_text (uiout, pidstr); | |
7676 | ui_out_text (uiout, ") exited normally]\n"); | |
33d62d64 | 7677 | } |
33d62d64 JK |
7678 | } |
7679 | ||
fd664c91 PA |
7680 | void |
7681 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 JK |
7682 | { |
7683 | annotate_signal (); | |
7684 | ||
a493e3e2 | 7685 | if (siggnal == GDB_SIGNAL_0 && !ui_out_is_mi_like_p (uiout)) |
33d62d64 JK |
7686 | { |
7687 | struct thread_info *t = inferior_thread (); | |
7688 | ||
7689 | ui_out_text (uiout, "\n["); | |
7690 | ui_out_field_string (uiout, "thread-name", | |
7691 | target_pid_to_str (t->ptid)); | |
7692 | ui_out_field_fmt (uiout, "thread-id", "] #%d", t->num); | |
7693 | ui_out_text (uiout, " stopped"); | |
7694 | } | |
7695 | else | |
7696 | { | |
7697 | ui_out_text (uiout, "\nProgram received signal "); | |
8b93c638 | 7698 | annotate_signal_name (); |
33d62d64 JK |
7699 | if (ui_out_is_mi_like_p (uiout)) |
7700 | ui_out_field_string | |
7701 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b | 7702 | ui_out_field_string (uiout, "signal-name", |
2ea28649 | 7703 | gdb_signal_to_name (siggnal)); |
8b93c638 JM |
7704 | annotate_signal_name_end (); |
7705 | ui_out_text (uiout, ", "); | |
7706 | annotate_signal_string (); | |
488f131b | 7707 | ui_out_field_string (uiout, "signal-meaning", |
2ea28649 | 7708 | gdb_signal_to_string (siggnal)); |
8b93c638 | 7709 | annotate_signal_string_end (); |
33d62d64 JK |
7710 | } |
7711 | ui_out_text (uiout, ".\n"); | |
7712 | } | |
252fbfc8 | 7713 | |
fd664c91 PA |
7714 | void |
7715 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 7716 | { |
fd664c91 | 7717 | ui_out_text (uiout, "\nNo more reverse-execution history.\n"); |
11cf8741 | 7718 | } |
43ff13b4 | 7719 | |
0c7e1a46 PA |
7720 | /* Print current location without a level number, if we have changed |
7721 | functions or hit a breakpoint. Print source line if we have one. | |
7722 | bpstat_print contains the logic deciding in detail what to print, | |
7723 | based on the event(s) that just occurred. */ | |
7724 | ||
243a9253 PA |
7725 | static void |
7726 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
7727 | { |
7728 | int bpstat_ret; | |
f486487f | 7729 | enum print_what source_flag; |
0c7e1a46 PA |
7730 | int do_frame_printing = 1; |
7731 | struct thread_info *tp = inferior_thread (); | |
7732 | ||
7733 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
7734 | switch (bpstat_ret) | |
7735 | { | |
7736 | case PRINT_UNKNOWN: | |
7737 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
7738 | should) carry around the function and does (or should) use | |
7739 | that when doing a frame comparison. */ | |
7740 | if (tp->control.stop_step | |
7741 | && frame_id_eq (tp->control.step_frame_id, | |
7742 | get_frame_id (get_current_frame ())) | |
885eeb5b | 7743 | && tp->control.step_start_function == find_pc_function (stop_pc)) |
0c7e1a46 PA |
7744 | { |
7745 | /* Finished step, just print source line. */ | |
7746 | source_flag = SRC_LINE; | |
7747 | } | |
7748 | else | |
7749 | { | |
7750 | /* Print location and source line. */ | |
7751 | source_flag = SRC_AND_LOC; | |
7752 | } | |
7753 | break; | |
7754 | case PRINT_SRC_AND_LOC: | |
7755 | /* Print location and source line. */ | |
7756 | source_flag = SRC_AND_LOC; | |
7757 | break; | |
7758 | case PRINT_SRC_ONLY: | |
7759 | source_flag = SRC_LINE; | |
7760 | break; | |
7761 | case PRINT_NOTHING: | |
7762 | /* Something bogus. */ | |
7763 | source_flag = SRC_LINE; | |
7764 | do_frame_printing = 0; | |
7765 | break; | |
7766 | default: | |
7767 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
7768 | } | |
7769 | ||
7770 | /* The behavior of this routine with respect to the source | |
7771 | flag is: | |
7772 | SRC_LINE: Print only source line | |
7773 | LOCATION: Print only location | |
7774 | SRC_AND_LOC: Print location and source line. */ | |
7775 | if (do_frame_printing) | |
7776 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
7777 | } |
7778 | ||
7779 | /* Cleanup that restores a previous current uiout. */ | |
7780 | ||
7781 | static void | |
7782 | restore_current_uiout_cleanup (void *arg) | |
7783 | { | |
7784 | struct ui_out *saved_uiout = arg; | |
7785 | ||
7786 | current_uiout = saved_uiout; | |
7787 | } | |
7788 | ||
7789 | /* See infrun.h. */ | |
7790 | ||
7791 | void | |
7792 | print_stop_event (struct ui_out *uiout) | |
7793 | { | |
7794 | struct cleanup *old_chain; | |
7795 | struct target_waitstatus last; | |
7796 | ptid_t last_ptid; | |
7797 | struct thread_info *tp; | |
7798 | ||
7799 | get_last_target_status (&last_ptid, &last); | |
7800 | ||
7801 | old_chain = make_cleanup (restore_current_uiout_cleanup, current_uiout); | |
7802 | current_uiout = uiout; | |
7803 | ||
7804 | print_stop_location (&last); | |
0c7e1a46 PA |
7805 | |
7806 | /* Display the auto-display expressions. */ | |
7807 | do_displays (); | |
243a9253 PA |
7808 | |
7809 | do_cleanups (old_chain); | |
7810 | ||
7811 | tp = inferior_thread (); | |
7812 | if (tp->thread_fsm != NULL | |
7813 | && thread_fsm_finished_p (tp->thread_fsm)) | |
7814 | { | |
7815 | struct return_value_info *rv; | |
7816 | ||
7817 | rv = thread_fsm_return_value (tp->thread_fsm); | |
7818 | if (rv != NULL) | |
7819 | print_return_value (uiout, rv); | |
7820 | } | |
0c7e1a46 PA |
7821 | } |
7822 | ||
388a7084 PA |
7823 | /* See infrun.h. */ |
7824 | ||
7825 | void | |
7826 | maybe_remove_breakpoints (void) | |
7827 | { | |
7828 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
7829 | { | |
7830 | if (remove_breakpoints ()) | |
7831 | { | |
7832 | target_terminal_ours_for_output (); | |
7833 | printf_filtered (_("Cannot remove breakpoints because " | |
7834 | "program is no longer writable.\nFurther " | |
7835 | "execution is probably impossible.\n")); | |
7836 | } | |
7837 | } | |
7838 | } | |
7839 | ||
c906108c SS |
7840 | /* Here to return control to GDB when the inferior stops for real. |
7841 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
7842 | ||
7843 | STOP_PRINT_FRAME nonzero means print the executing frame | |
7844 | (pc, function, args, file, line number and line text). | |
7845 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
7846 | attempting to insert breakpoints. */ | |
7847 | ||
7848 | void | |
96baa820 | 7849 | normal_stop (void) |
c906108c | 7850 | { |
73b65bb0 DJ |
7851 | struct target_waitstatus last; |
7852 | ptid_t last_ptid; | |
29f49a6a | 7853 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
e1316e60 | 7854 | ptid_t pid_ptid; |
73b65bb0 DJ |
7855 | |
7856 | get_last_target_status (&last_ptid, &last); | |
7857 | ||
29f49a6a PA |
7858 | /* If an exception is thrown from this point on, make sure to |
7859 | propagate GDB's knowledge of the executing state to the | |
7860 | frontend/user running state. A QUIT is an easy exception to see | |
7861 | here, so do this before any filtered output. */ | |
c35b1492 PA |
7862 | if (!non_stop) |
7863 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
e1316e60 PA |
7864 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
7865 | || last.kind == TARGET_WAITKIND_EXITED) | |
7866 | { | |
7867 | /* On some targets, we may still have live threads in the | |
7868 | inferior when we get a process exit event. E.g., for | |
7869 | "checkpoint", when the current checkpoint/fork exits, | |
7870 | linux-fork.c automatically switches to another fork from | |
7871 | within target_mourn_inferior. */ | |
7872 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
7873 | { | |
7874 | pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
7875 | make_cleanup (finish_thread_state_cleanup, &pid_ptid); | |
7876 | } | |
7877 | } | |
7878 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c35b1492 | 7879 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); |
29f49a6a | 7880 | |
b57bacec PA |
7881 | /* As we're presenting a stop, and potentially removing breakpoints, |
7882 | update the thread list so we can tell whether there are threads | |
7883 | running on the target. With target remote, for example, we can | |
7884 | only learn about new threads when we explicitly update the thread | |
7885 | list. Do this before notifying the interpreters about signal | |
7886 | stops, end of stepping ranges, etc., so that the "new thread" | |
7887 | output is emitted before e.g., "Program received signal FOO", | |
7888 | instead of after. */ | |
7889 | update_thread_list (); | |
7890 | ||
7891 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
7892 | observer_notify_signal_received (inferior_thread ()->suspend.stop_signal); | |
7893 | ||
c906108c SS |
7894 | /* As with the notification of thread events, we want to delay |
7895 | notifying the user that we've switched thread context until | |
7896 | the inferior actually stops. | |
7897 | ||
73b65bb0 DJ |
7898 | There's no point in saying anything if the inferior has exited. |
7899 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
7900 | "received a signal". |
7901 | ||
7902 | Also skip saying anything in non-stop mode. In that mode, as we | |
7903 | don't want GDB to switch threads behind the user's back, to avoid | |
7904 | races where the user is typing a command to apply to thread x, | |
7905 | but GDB switches to thread y before the user finishes entering | |
7906 | the command, fetch_inferior_event installs a cleanup to restore | |
7907 | the current thread back to the thread the user had selected right | |
7908 | after this event is handled, so we're not really switching, only | |
7909 | informing of a stop. */ | |
4f8d22e3 PA |
7910 | if (!non_stop |
7911 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
7912 | && target_has_execution |
7913 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
7914 | && last.kind != TARGET_WAITKIND_EXITED |
7915 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c SS |
7916 | { |
7917 | target_terminal_ours_for_output (); | |
a3f17187 | 7918 | printf_filtered (_("[Switching to %s]\n"), |
c95310c6 | 7919 | target_pid_to_str (inferior_ptid)); |
b8fa951a | 7920 | annotate_thread_changed (); |
39f77062 | 7921 | previous_inferior_ptid = inferior_ptid; |
c906108c | 7922 | } |
c906108c | 7923 | |
0e5bf2a8 PA |
7924 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
7925 | { | |
7926 | gdb_assert (sync_execution || !target_can_async_p ()); | |
7927 | ||
7928 | target_terminal_ours_for_output (); | |
7929 | printf_filtered (_("No unwaited-for children left.\n")); | |
7930 | } | |
7931 | ||
b57bacec | 7932 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 7933 | maybe_remove_breakpoints (); |
c906108c | 7934 | |
c906108c SS |
7935 | /* If an auto-display called a function and that got a signal, |
7936 | delete that auto-display to avoid an infinite recursion. */ | |
7937 | ||
7938 | if (stopped_by_random_signal) | |
7939 | disable_current_display (); | |
7940 | ||
c906108c | 7941 | target_terminal_ours (); |
0f641c01 | 7942 | async_enable_stdin (); |
c906108c | 7943 | |
388a7084 PA |
7944 | /* Let the user/frontend see the threads as stopped. */ |
7945 | do_cleanups (old_chain); | |
7946 | ||
7947 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
7948 | and current location is based on that. Handle the case where the | |
7949 | dummy call is returning after being stopped. E.g. the dummy call | |
7950 | previously hit a breakpoint. (If the dummy call returns | |
7951 | normally, we won't reach here.) Do this before the stop hook is | |
7952 | run, so that it doesn't get to see the temporary dummy frame, | |
7953 | which is not where we'll present the stop. */ | |
7954 | if (has_stack_frames ()) | |
7955 | { | |
7956 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
7957 | { | |
7958 | /* Pop the empty frame that contains the stack dummy. This | |
7959 | also restores inferior state prior to the call (struct | |
7960 | infcall_suspend_state). */ | |
7961 | struct frame_info *frame = get_current_frame (); | |
7962 | ||
7963 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
7964 | frame_pop (frame); | |
7965 | /* frame_pop calls reinit_frame_cache as the last thing it | |
7966 | does which means there's now no selected frame. */ | |
7967 | } | |
7968 | ||
7969 | select_frame (get_current_frame ()); | |
7970 | ||
7971 | /* Set the current source location. */ | |
7972 | set_current_sal_from_frame (get_current_frame ()); | |
7973 | } | |
dd7e2d2b PA |
7974 | |
7975 | /* Look up the hook_stop and run it (CLI internally handles problem | |
7976 | of stop_command's pre-hook not existing). */ | |
7977 | if (stop_command) | |
7978 | catch_errors (hook_stop_stub, stop_command, | |
7979 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
7980 | ||
388a7084 PA |
7981 | /* Notify observers about the stop. This is where the interpreters |
7982 | print the stop event. */ | |
7983 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
7984 | observer_notify_normal_stop (inferior_thread ()->control.stop_bpstat, | |
7985 | stop_print_frame); | |
7986 | else | |
7987 | observer_notify_normal_stop (NULL, stop_print_frame); | |
347bddb7 | 7988 | |
243a9253 PA |
7989 | annotate_stopped (); |
7990 | ||
48844aa6 PA |
7991 | if (target_has_execution) |
7992 | { | |
7993 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
7994 | && last.kind != TARGET_WAITKIND_EXITED) | |
7995 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
7996 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 7997 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 7998 | } |
6c95b8df PA |
7999 | |
8000 | /* Try to get rid of automatically added inferiors that are no | |
8001 | longer needed. Keeping those around slows down things linearly. | |
8002 | Note that this never removes the current inferior. */ | |
8003 | prune_inferiors (); | |
c906108c SS |
8004 | } |
8005 | ||
8006 | static int | |
96baa820 | 8007 | hook_stop_stub (void *cmd) |
c906108c | 8008 | { |
5913bcb0 | 8009 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
8010 | return (0); |
8011 | } | |
8012 | \f | |
c5aa993b | 8013 | int |
96baa820 | 8014 | signal_stop_state (int signo) |
c906108c | 8015 | { |
d6b48e9c | 8016 | return signal_stop[signo]; |
c906108c SS |
8017 | } |
8018 | ||
c5aa993b | 8019 | int |
96baa820 | 8020 | signal_print_state (int signo) |
c906108c SS |
8021 | { |
8022 | return signal_print[signo]; | |
8023 | } | |
8024 | ||
c5aa993b | 8025 | int |
96baa820 | 8026 | signal_pass_state (int signo) |
c906108c SS |
8027 | { |
8028 | return signal_program[signo]; | |
8029 | } | |
8030 | ||
2455069d UW |
8031 | static void |
8032 | signal_cache_update (int signo) | |
8033 | { | |
8034 | if (signo == -1) | |
8035 | { | |
a493e3e2 | 8036 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8037 | signal_cache_update (signo); |
8038 | ||
8039 | return; | |
8040 | } | |
8041 | ||
8042 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8043 | && signal_print[signo] == 0 | |
ab04a2af TT |
8044 | && signal_program[signo] == 1 |
8045 | && signal_catch[signo] == 0); | |
2455069d UW |
8046 | } |
8047 | ||
488f131b | 8048 | int |
7bda5e4a | 8049 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8050 | { |
8051 | int ret = signal_stop[signo]; | |
abbb1732 | 8052 | |
d4f3574e | 8053 | signal_stop[signo] = state; |
2455069d | 8054 | signal_cache_update (signo); |
d4f3574e SS |
8055 | return ret; |
8056 | } | |
8057 | ||
488f131b | 8058 | int |
7bda5e4a | 8059 | signal_print_update (int signo, int state) |
d4f3574e SS |
8060 | { |
8061 | int ret = signal_print[signo]; | |
abbb1732 | 8062 | |
d4f3574e | 8063 | signal_print[signo] = state; |
2455069d | 8064 | signal_cache_update (signo); |
d4f3574e SS |
8065 | return ret; |
8066 | } | |
8067 | ||
488f131b | 8068 | int |
7bda5e4a | 8069 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8070 | { |
8071 | int ret = signal_program[signo]; | |
abbb1732 | 8072 | |
d4f3574e | 8073 | signal_program[signo] = state; |
2455069d | 8074 | signal_cache_update (signo); |
d4f3574e SS |
8075 | return ret; |
8076 | } | |
8077 | ||
ab04a2af TT |
8078 | /* Update the global 'signal_catch' from INFO and notify the |
8079 | target. */ | |
8080 | ||
8081 | void | |
8082 | signal_catch_update (const unsigned int *info) | |
8083 | { | |
8084 | int i; | |
8085 | ||
8086 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8087 | signal_catch[i] = info[i] > 0; | |
8088 | signal_cache_update (-1); | |
8089 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); | |
8090 | } | |
8091 | ||
c906108c | 8092 | static void |
96baa820 | 8093 | sig_print_header (void) |
c906108c | 8094 | { |
3e43a32a MS |
8095 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8096 | "to program\tDescription\n")); | |
c906108c SS |
8097 | } |
8098 | ||
8099 | static void | |
2ea28649 | 8100 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8101 | { |
2ea28649 | 8102 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8103 | int name_padding = 13 - strlen (name); |
96baa820 | 8104 | |
c906108c SS |
8105 | if (name_padding <= 0) |
8106 | name_padding = 0; | |
8107 | ||
8108 | printf_filtered ("%s", name); | |
488f131b | 8109 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8110 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8111 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8112 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8113 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8114 | } |
8115 | ||
8116 | /* Specify how various signals in the inferior should be handled. */ | |
8117 | ||
8118 | static void | |
96baa820 | 8119 | handle_command (char *args, int from_tty) |
c906108c SS |
8120 | { |
8121 | char **argv; | |
8122 | int digits, wordlen; | |
8123 | int sigfirst, signum, siglast; | |
2ea28649 | 8124 | enum gdb_signal oursig; |
c906108c SS |
8125 | int allsigs; |
8126 | int nsigs; | |
8127 | unsigned char *sigs; | |
8128 | struct cleanup *old_chain; | |
8129 | ||
8130 | if (args == NULL) | |
8131 | { | |
e2e0b3e5 | 8132 | error_no_arg (_("signal to handle")); |
c906108c SS |
8133 | } |
8134 | ||
1777feb0 | 8135 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8136 | |
a493e3e2 | 8137 | nsigs = (int) GDB_SIGNAL_LAST; |
c906108c SS |
8138 | sigs = (unsigned char *) alloca (nsigs); |
8139 | memset (sigs, 0, nsigs); | |
8140 | ||
1777feb0 | 8141 | /* Break the command line up into args. */ |
c906108c | 8142 | |
d1a41061 | 8143 | argv = gdb_buildargv (args); |
7a292a7a | 8144 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
8145 | |
8146 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8147 | actions. Signal numbers and signal names may be interspersed with | |
8148 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8149 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c SS |
8150 | |
8151 | while (*argv != NULL) | |
8152 | { | |
8153 | wordlen = strlen (*argv); | |
8154 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
8155 | {; | |
8156 | } | |
8157 | allsigs = 0; | |
8158 | sigfirst = siglast = -1; | |
8159 | ||
8160 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
8161 | { | |
8162 | /* Apply action to all signals except those used by the | |
1777feb0 | 8163 | debugger. Silently skip those. */ |
c906108c SS |
8164 | allsigs = 1; |
8165 | sigfirst = 0; | |
8166 | siglast = nsigs - 1; | |
8167 | } | |
8168 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
8169 | { | |
8170 | SET_SIGS (nsigs, sigs, signal_stop); | |
8171 | SET_SIGS (nsigs, sigs, signal_print); | |
8172 | } | |
8173 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
8174 | { | |
8175 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8176 | } | |
8177 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
8178 | { | |
8179 | SET_SIGS (nsigs, sigs, signal_print); | |
8180 | } | |
8181 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
8182 | { | |
8183 | SET_SIGS (nsigs, sigs, signal_program); | |
8184 | } | |
8185 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
8186 | { | |
8187 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8188 | } | |
8189 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
8190 | { | |
8191 | SET_SIGS (nsigs, sigs, signal_program); | |
8192 | } | |
8193 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
8194 | { | |
8195 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8196 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8197 | } | |
8198 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
8199 | { | |
8200 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8201 | } | |
8202 | else if (digits > 0) | |
8203 | { | |
8204 | /* It is numeric. The numeric signal refers to our own | |
8205 | internal signal numbering from target.h, not to host/target | |
8206 | signal number. This is a feature; users really should be | |
8207 | using symbolic names anyway, and the common ones like | |
8208 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8209 | ||
8210 | sigfirst = siglast = (int) | |
2ea28649 | 8211 | gdb_signal_from_command (atoi (*argv)); |
c906108c SS |
8212 | if ((*argv)[digits] == '-') |
8213 | { | |
8214 | siglast = (int) | |
2ea28649 | 8215 | gdb_signal_from_command (atoi ((*argv) + digits + 1)); |
c906108c SS |
8216 | } |
8217 | if (sigfirst > siglast) | |
8218 | { | |
1777feb0 | 8219 | /* Bet he didn't figure we'd think of this case... */ |
c906108c SS |
8220 | signum = sigfirst; |
8221 | sigfirst = siglast; | |
8222 | siglast = signum; | |
8223 | } | |
8224 | } | |
8225 | else | |
8226 | { | |
2ea28649 | 8227 | oursig = gdb_signal_from_name (*argv); |
a493e3e2 | 8228 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8229 | { |
8230 | sigfirst = siglast = (int) oursig; | |
8231 | } | |
8232 | else | |
8233 | { | |
8234 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 8235 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
8236 | } |
8237 | } | |
8238 | ||
8239 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8240 | which signals to apply actions to. */ |
c906108c SS |
8241 | |
8242 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
8243 | { | |
2ea28649 | 8244 | switch ((enum gdb_signal) signum) |
c906108c | 8245 | { |
a493e3e2 PA |
8246 | case GDB_SIGNAL_TRAP: |
8247 | case GDB_SIGNAL_INT: | |
c906108c SS |
8248 | if (!allsigs && !sigs[signum]) |
8249 | { | |
9e2f0ad4 | 8250 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8251 | Are you sure you want to change it? "), |
2ea28649 | 8252 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8253 | { |
8254 | sigs[signum] = 1; | |
8255 | } | |
8256 | else | |
8257 | { | |
a3f17187 | 8258 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8259 | gdb_flush (gdb_stdout); |
8260 | } | |
8261 | } | |
8262 | break; | |
a493e3e2 PA |
8263 | case GDB_SIGNAL_0: |
8264 | case GDB_SIGNAL_DEFAULT: | |
8265 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8266 | /* Make sure that "all" doesn't print these. */ |
8267 | break; | |
8268 | default: | |
8269 | sigs[signum] = 1; | |
8270 | break; | |
8271 | } | |
8272 | } | |
8273 | ||
8274 | argv++; | |
8275 | } | |
8276 | ||
3a031f65 PA |
8277 | for (signum = 0; signum < nsigs; signum++) |
8278 | if (sigs[signum]) | |
8279 | { | |
2455069d | 8280 | signal_cache_update (-1); |
a493e3e2 PA |
8281 | target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass); |
8282 | target_program_signals ((int) GDB_SIGNAL_LAST, signal_program); | |
c906108c | 8283 | |
3a031f65 PA |
8284 | if (from_tty) |
8285 | { | |
8286 | /* Show the results. */ | |
8287 | sig_print_header (); | |
8288 | for (; signum < nsigs; signum++) | |
8289 | if (sigs[signum]) | |
aead7601 | 8290 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8291 | } |
8292 | ||
8293 | break; | |
8294 | } | |
c906108c SS |
8295 | |
8296 | do_cleanups (old_chain); | |
8297 | } | |
8298 | ||
de0bea00 MF |
8299 | /* Complete the "handle" command. */ |
8300 | ||
8301 | static VEC (char_ptr) * | |
8302 | handle_completer (struct cmd_list_element *ignore, | |
6f937416 | 8303 | const char *text, const char *word) |
de0bea00 MF |
8304 | { |
8305 | VEC (char_ptr) *vec_signals, *vec_keywords, *return_val; | |
8306 | static const char * const keywords[] = | |
8307 | { | |
8308 | "all", | |
8309 | "stop", | |
8310 | "ignore", | |
8311 | "print", | |
8312 | "pass", | |
8313 | "nostop", | |
8314 | "noignore", | |
8315 | "noprint", | |
8316 | "nopass", | |
8317 | NULL, | |
8318 | }; | |
8319 | ||
8320 | vec_signals = signal_completer (ignore, text, word); | |
8321 | vec_keywords = complete_on_enum (keywords, word, word); | |
8322 | ||
8323 | return_val = VEC_merge (char_ptr, vec_signals, vec_keywords); | |
8324 | VEC_free (char_ptr, vec_signals); | |
8325 | VEC_free (char_ptr, vec_keywords); | |
8326 | return return_val; | |
8327 | } | |
8328 | ||
2ea28649 PA |
8329 | enum gdb_signal |
8330 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8331 | { |
8332 | if (num >= 1 && num <= 15) | |
2ea28649 | 8333 | return (enum gdb_signal) num; |
ed01b82c PA |
8334 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8335 | Use \"info signals\" for a list of symbolic signals.")); | |
8336 | } | |
8337 | ||
c906108c SS |
8338 | /* Print current contents of the tables set by the handle command. |
8339 | It is possible we should just be printing signals actually used | |
8340 | by the current target (but for things to work right when switching | |
8341 | targets, all signals should be in the signal tables). */ | |
8342 | ||
8343 | static void | |
96baa820 | 8344 | signals_info (char *signum_exp, int from_tty) |
c906108c | 8345 | { |
2ea28649 | 8346 | enum gdb_signal oursig; |
abbb1732 | 8347 | |
c906108c SS |
8348 | sig_print_header (); |
8349 | ||
8350 | if (signum_exp) | |
8351 | { | |
8352 | /* First see if this is a symbol name. */ | |
2ea28649 | 8353 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8354 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8355 | { |
8356 | /* No, try numeric. */ | |
8357 | oursig = | |
2ea28649 | 8358 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8359 | } |
8360 | sig_print_info (oursig); | |
8361 | return; | |
8362 | } | |
8363 | ||
8364 | printf_filtered ("\n"); | |
8365 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8366 | for (oursig = GDB_SIGNAL_FIRST; |
8367 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8368 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8369 | { |
8370 | QUIT; | |
8371 | ||
a493e3e2 PA |
8372 | if (oursig != GDB_SIGNAL_UNKNOWN |
8373 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8374 | sig_print_info (oursig); |
8375 | } | |
8376 | ||
3e43a32a MS |
8377 | printf_filtered (_("\nUse the \"handle\" command " |
8378 | "to change these tables.\n")); | |
c906108c | 8379 | } |
4aa995e1 | 8380 | |
c709acd1 PA |
8381 | /* Check if it makes sense to read $_siginfo from the current thread |
8382 | at this point. If not, throw an error. */ | |
8383 | ||
8384 | static void | |
8385 | validate_siginfo_access (void) | |
8386 | { | |
8387 | /* No current inferior, no siginfo. */ | |
8388 | if (ptid_equal (inferior_ptid, null_ptid)) | |
8389 | error (_("No thread selected.")); | |
8390 | ||
8391 | /* Don't try to read from a dead thread. */ | |
8392 | if (is_exited (inferior_ptid)) | |
8393 | error (_("The current thread has terminated")); | |
8394 | ||
8395 | /* ... or from a spinning thread. */ | |
8396 | if (is_running (inferior_ptid)) | |
8397 | error (_("Selected thread is running.")); | |
8398 | } | |
8399 | ||
4aa995e1 PA |
8400 | /* The $_siginfo convenience variable is a bit special. We don't know |
8401 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8402 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8403 | also dependent on which thread you have selected. |
8404 | ||
8405 | 1. making $_siginfo be an internalvar that creates a new value on | |
8406 | access. | |
8407 | ||
8408 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8409 | ||
8410 | /* This function implements the lval_computed support for reading a | |
8411 | $_siginfo value. */ | |
8412 | ||
8413 | static void | |
8414 | siginfo_value_read (struct value *v) | |
8415 | { | |
8416 | LONGEST transferred; | |
8417 | ||
c709acd1 PA |
8418 | validate_siginfo_access (); |
8419 | ||
4aa995e1 PA |
8420 | transferred = |
8421 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
8422 | NULL, | |
8423 | value_contents_all_raw (v), | |
8424 | value_offset (v), | |
8425 | TYPE_LENGTH (value_type (v))); | |
8426 | ||
8427 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8428 | error (_("Unable to read siginfo")); | |
8429 | } | |
8430 | ||
8431 | /* This function implements the lval_computed support for writing a | |
8432 | $_siginfo value. */ | |
8433 | ||
8434 | static void | |
8435 | siginfo_value_write (struct value *v, struct value *fromval) | |
8436 | { | |
8437 | LONGEST transferred; | |
8438 | ||
c709acd1 PA |
8439 | validate_siginfo_access (); |
8440 | ||
4aa995e1 PA |
8441 | transferred = target_write (¤t_target, |
8442 | TARGET_OBJECT_SIGNAL_INFO, | |
8443 | NULL, | |
8444 | value_contents_all_raw (fromval), | |
8445 | value_offset (v), | |
8446 | TYPE_LENGTH (value_type (fromval))); | |
8447 | ||
8448 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8449 | error (_("Unable to write siginfo")); | |
8450 | } | |
8451 | ||
c8f2448a | 8452 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8453 | { |
8454 | siginfo_value_read, | |
8455 | siginfo_value_write | |
8456 | }; | |
8457 | ||
8458 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8459 | the current thread using architecture GDBARCH. Return a void value |
8460 | if there's no object available. */ | |
4aa995e1 | 8461 | |
2c0b251b | 8462 | static struct value * |
22d2b532 SDJ |
8463 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8464 | void *ignore) | |
4aa995e1 | 8465 | { |
4aa995e1 | 8466 | if (target_has_stack |
78267919 UW |
8467 | && !ptid_equal (inferior_ptid, null_ptid) |
8468 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
4aa995e1 | 8469 | { |
78267919 | 8470 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8471 | |
78267919 | 8472 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8473 | } |
8474 | ||
78267919 | 8475 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8476 | } |
8477 | ||
c906108c | 8478 | \f |
16c381f0 JK |
8479 | /* infcall_suspend_state contains state about the program itself like its |
8480 | registers and any signal it received when it last stopped. | |
8481 | This state must be restored regardless of how the inferior function call | |
8482 | ends (either successfully, or after it hits a breakpoint or signal) | |
8483 | if the program is to properly continue where it left off. */ | |
8484 | ||
8485 | struct infcall_suspend_state | |
7a292a7a | 8486 | { |
16c381f0 | 8487 | struct thread_suspend_state thread_suspend; |
16c381f0 JK |
8488 | |
8489 | /* Other fields: */ | |
7a292a7a | 8490 | CORE_ADDR stop_pc; |
b89667eb | 8491 | struct regcache *registers; |
1736ad11 | 8492 | |
35515841 | 8493 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
1736ad11 JK |
8494 | struct gdbarch *siginfo_gdbarch; |
8495 | ||
8496 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8497 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8498 | content would be invalid. */ | |
8499 | gdb_byte *siginfo_data; | |
b89667eb DE |
8500 | }; |
8501 | ||
16c381f0 JK |
8502 | struct infcall_suspend_state * |
8503 | save_infcall_suspend_state (void) | |
b89667eb | 8504 | { |
16c381f0 | 8505 | struct infcall_suspend_state *inf_state; |
b89667eb | 8506 | struct thread_info *tp = inferior_thread (); |
1736ad11 JK |
8507 | struct regcache *regcache = get_current_regcache (); |
8508 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
8509 | gdb_byte *siginfo_data = NULL; | |
8510 | ||
8511 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8512 | { | |
8513 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8514 | size_t len = TYPE_LENGTH (type); | |
8515 | struct cleanup *back_to; | |
8516 | ||
8517 | siginfo_data = xmalloc (len); | |
8518 | back_to = make_cleanup (xfree, siginfo_data); | |
8519 | ||
8520 | if (target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8521 | siginfo_data, 0, len) == len) | |
8522 | discard_cleanups (back_to); | |
8523 | else | |
8524 | { | |
8525 | /* Errors ignored. */ | |
8526 | do_cleanups (back_to); | |
8527 | siginfo_data = NULL; | |
8528 | } | |
8529 | } | |
8530 | ||
41bf6aca | 8531 | inf_state = XCNEW (struct infcall_suspend_state); |
1736ad11 JK |
8532 | |
8533 | if (siginfo_data) | |
8534 | { | |
8535 | inf_state->siginfo_gdbarch = gdbarch; | |
8536 | inf_state->siginfo_data = siginfo_data; | |
8537 | } | |
b89667eb | 8538 | |
16c381f0 | 8539 | inf_state->thread_suspend = tp->suspend; |
16c381f0 | 8540 | |
35515841 | 8541 | /* run_inferior_call will not use the signal due to its `proceed' call with |
a493e3e2 PA |
8542 | GDB_SIGNAL_0 anyway. */ |
8543 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
35515841 | 8544 | |
b89667eb DE |
8545 | inf_state->stop_pc = stop_pc; |
8546 | ||
1736ad11 | 8547 | inf_state->registers = regcache_dup (regcache); |
b89667eb DE |
8548 | |
8549 | return inf_state; | |
8550 | } | |
8551 | ||
8552 | /* Restore inferior session state to INF_STATE. */ | |
8553 | ||
8554 | void | |
16c381f0 | 8555 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8556 | { |
8557 | struct thread_info *tp = inferior_thread (); | |
1736ad11 JK |
8558 | struct regcache *regcache = get_current_regcache (); |
8559 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
b89667eb | 8560 | |
16c381f0 | 8561 | tp->suspend = inf_state->thread_suspend; |
16c381f0 | 8562 | |
b89667eb DE |
8563 | stop_pc = inf_state->stop_pc; |
8564 | ||
1736ad11 JK |
8565 | if (inf_state->siginfo_gdbarch == gdbarch) |
8566 | { | |
8567 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
1736ad11 JK |
8568 | |
8569 | /* Errors ignored. */ | |
8570 | target_write (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6acef6cd | 8571 | inf_state->siginfo_data, 0, TYPE_LENGTH (type)); |
1736ad11 JK |
8572 | } |
8573 | ||
b89667eb DE |
8574 | /* The inferior can be gone if the user types "print exit(0)" |
8575 | (and perhaps other times). */ | |
8576 | if (target_has_execution) | |
8577 | /* NB: The register write goes through to the target. */ | |
1736ad11 | 8578 | regcache_cpy (regcache, inf_state->registers); |
803b5f95 | 8579 | |
16c381f0 | 8580 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8581 | } |
8582 | ||
8583 | static void | |
16c381f0 | 8584 | do_restore_infcall_suspend_state_cleanup (void *state) |
b89667eb | 8585 | { |
16c381f0 | 8586 | restore_infcall_suspend_state (state); |
b89667eb DE |
8587 | } |
8588 | ||
8589 | struct cleanup * | |
16c381f0 JK |
8590 | make_cleanup_restore_infcall_suspend_state |
8591 | (struct infcall_suspend_state *inf_state) | |
b89667eb | 8592 | { |
16c381f0 | 8593 | return make_cleanup (do_restore_infcall_suspend_state_cleanup, inf_state); |
b89667eb DE |
8594 | } |
8595 | ||
8596 | void | |
16c381f0 | 8597 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8598 | { |
8599 | regcache_xfree (inf_state->registers); | |
803b5f95 | 8600 | xfree (inf_state->siginfo_data); |
b89667eb DE |
8601 | xfree (inf_state); |
8602 | } | |
8603 | ||
8604 | struct regcache * | |
16c381f0 | 8605 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8606 | { |
8607 | return inf_state->registers; | |
8608 | } | |
8609 | ||
16c381f0 JK |
8610 | /* infcall_control_state contains state regarding gdb's control of the |
8611 | inferior itself like stepping control. It also contains session state like | |
8612 | the user's currently selected frame. */ | |
b89667eb | 8613 | |
16c381f0 | 8614 | struct infcall_control_state |
b89667eb | 8615 | { |
16c381f0 JK |
8616 | struct thread_control_state thread_control; |
8617 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
8618 | |
8619 | /* Other fields: */ | |
8620 | enum stop_stack_kind stop_stack_dummy; | |
8621 | int stopped_by_random_signal; | |
7a292a7a | 8622 | int stop_after_trap; |
7a292a7a | 8623 | |
b89667eb | 8624 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe | 8625 | struct frame_id selected_frame_id; |
7a292a7a SS |
8626 | }; |
8627 | ||
c906108c | 8628 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 8629 | connection. */ |
c906108c | 8630 | |
16c381f0 JK |
8631 | struct infcall_control_state * |
8632 | save_infcall_control_state (void) | |
c906108c | 8633 | { |
8d749320 SM |
8634 | struct infcall_control_state *inf_status = |
8635 | XNEW (struct infcall_control_state); | |
4e1c45ea | 8636 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8637 | struct inferior *inf = current_inferior (); |
7a292a7a | 8638 | |
16c381f0 JK |
8639 | inf_status->thread_control = tp->control; |
8640 | inf_status->inferior_control = inf->control; | |
d82142e2 | 8641 | |
8358c15c | 8642 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 8643 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 8644 | |
16c381f0 JK |
8645 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
8646 | chain. If caller's caller is walking the chain, they'll be happier if we | |
8647 | hand them back the original chain when restore_infcall_control_state is | |
8648 | called. */ | |
8649 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
8650 | |
8651 | /* Other fields: */ | |
8652 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
8653 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
8654 | inf_status->stop_after_trap = stop_after_trap; | |
c5aa993b | 8655 | |
206415a3 | 8656 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 8657 | |
7a292a7a | 8658 | return inf_status; |
c906108c SS |
8659 | } |
8660 | ||
c906108c | 8661 | static int |
96baa820 | 8662 | restore_selected_frame (void *args) |
c906108c | 8663 | { |
488f131b | 8664 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 8665 | struct frame_info *frame; |
c906108c | 8666 | |
101dcfbe | 8667 | frame = frame_find_by_id (*fid); |
c906108c | 8668 | |
aa0cd9c1 AC |
8669 | /* If inf_status->selected_frame_id is NULL, there was no previously |
8670 | selected frame. */ | |
101dcfbe | 8671 | if (frame == NULL) |
c906108c | 8672 | { |
8a3fe4f8 | 8673 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
8674 | return 0; |
8675 | } | |
8676 | ||
0f7d239c | 8677 | select_frame (frame); |
c906108c SS |
8678 | |
8679 | return (1); | |
8680 | } | |
8681 | ||
b89667eb DE |
8682 | /* Restore inferior session state to INF_STATUS. */ |
8683 | ||
c906108c | 8684 | void |
16c381f0 | 8685 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 8686 | { |
4e1c45ea | 8687 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8688 | struct inferior *inf = current_inferior (); |
4e1c45ea | 8689 | |
8358c15c JK |
8690 | if (tp->control.step_resume_breakpoint) |
8691 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
8692 | ||
5b79abe7 TT |
8693 | if (tp->control.exception_resume_breakpoint) |
8694 | tp->control.exception_resume_breakpoint->disposition | |
8695 | = disp_del_at_next_stop; | |
8696 | ||
d82142e2 | 8697 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 8698 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 8699 | |
16c381f0 JK |
8700 | tp->control = inf_status->thread_control; |
8701 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
8702 | |
8703 | /* Other fields: */ | |
8704 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
8705 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
8706 | stop_after_trap = inf_status->stop_after_trap; | |
c906108c | 8707 | |
b89667eb | 8708 | if (target_has_stack) |
c906108c | 8709 | { |
c906108c | 8710 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
8711 | walking the stack might encounter a garbage pointer and |
8712 | error() trying to dereference it. */ | |
488f131b JB |
8713 | if (catch_errors |
8714 | (restore_selected_frame, &inf_status->selected_frame_id, | |
8715 | "Unable to restore previously selected frame:\n", | |
8716 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
8717 | /* Error in restoring the selected frame. Select the innermost |
8718 | frame. */ | |
0f7d239c | 8719 | select_frame (get_current_frame ()); |
c906108c | 8720 | } |
c906108c | 8721 | |
72cec141 | 8722 | xfree (inf_status); |
7a292a7a | 8723 | } |
c906108c | 8724 | |
74b7792f | 8725 | static void |
16c381f0 | 8726 | do_restore_infcall_control_state_cleanup (void *sts) |
74b7792f | 8727 | { |
16c381f0 | 8728 | restore_infcall_control_state (sts); |
74b7792f AC |
8729 | } |
8730 | ||
8731 | struct cleanup * | |
16c381f0 JK |
8732 | make_cleanup_restore_infcall_control_state |
8733 | (struct infcall_control_state *inf_status) | |
74b7792f | 8734 | { |
16c381f0 | 8735 | return make_cleanup (do_restore_infcall_control_state_cleanup, inf_status); |
74b7792f AC |
8736 | } |
8737 | ||
c906108c | 8738 | void |
16c381f0 | 8739 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 8740 | { |
8358c15c JK |
8741 | if (inf_status->thread_control.step_resume_breakpoint) |
8742 | inf_status->thread_control.step_resume_breakpoint->disposition | |
8743 | = disp_del_at_next_stop; | |
8744 | ||
5b79abe7 TT |
8745 | if (inf_status->thread_control.exception_resume_breakpoint) |
8746 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
8747 | = disp_del_at_next_stop; | |
8748 | ||
1777feb0 | 8749 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 8750 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 8751 | |
72cec141 | 8752 | xfree (inf_status); |
7a292a7a | 8753 | } |
b89667eb | 8754 | \f |
ca6724c1 KB |
8755 | /* restore_inferior_ptid() will be used by the cleanup machinery |
8756 | to restore the inferior_ptid value saved in a call to | |
8757 | save_inferior_ptid(). */ | |
ce696e05 KB |
8758 | |
8759 | static void | |
8760 | restore_inferior_ptid (void *arg) | |
8761 | { | |
8762 | ptid_t *saved_ptid_ptr = arg; | |
abbb1732 | 8763 | |
ce696e05 KB |
8764 | inferior_ptid = *saved_ptid_ptr; |
8765 | xfree (arg); | |
8766 | } | |
8767 | ||
8768 | /* Save the value of inferior_ptid so that it may be restored by a | |
8769 | later call to do_cleanups(). Returns the struct cleanup pointer | |
8770 | needed for later doing the cleanup. */ | |
8771 | ||
8772 | struct cleanup * | |
8773 | save_inferior_ptid (void) | |
8774 | { | |
8d749320 | 8775 | ptid_t *saved_ptid_ptr = XNEW (ptid_t); |
ce696e05 | 8776 | |
ce696e05 KB |
8777 | *saved_ptid_ptr = inferior_ptid; |
8778 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
8779 | } | |
0c557179 | 8780 | |
7f89fd65 | 8781 | /* See infrun.h. */ |
0c557179 SDJ |
8782 | |
8783 | void | |
8784 | clear_exit_convenience_vars (void) | |
8785 | { | |
8786 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
8787 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
8788 | } | |
c5aa993b | 8789 | \f |
488f131b | 8790 | |
b2175913 MS |
8791 | /* User interface for reverse debugging: |
8792 | Set exec-direction / show exec-direction commands | |
8793 | (returns error unless target implements to_set_exec_direction method). */ | |
8794 | ||
32231432 | 8795 | int execution_direction = EXEC_FORWARD; |
b2175913 MS |
8796 | static const char exec_forward[] = "forward"; |
8797 | static const char exec_reverse[] = "reverse"; | |
8798 | static const char *exec_direction = exec_forward; | |
40478521 | 8799 | static const char *const exec_direction_names[] = { |
b2175913 MS |
8800 | exec_forward, |
8801 | exec_reverse, | |
8802 | NULL | |
8803 | }; | |
8804 | ||
8805 | static void | |
8806 | set_exec_direction_func (char *args, int from_tty, | |
8807 | struct cmd_list_element *cmd) | |
8808 | { | |
8809 | if (target_can_execute_reverse) | |
8810 | { | |
8811 | if (!strcmp (exec_direction, exec_forward)) | |
8812 | execution_direction = EXEC_FORWARD; | |
8813 | else if (!strcmp (exec_direction, exec_reverse)) | |
8814 | execution_direction = EXEC_REVERSE; | |
8815 | } | |
8bbed405 MS |
8816 | else |
8817 | { | |
8818 | exec_direction = exec_forward; | |
8819 | error (_("Target does not support this operation.")); | |
8820 | } | |
b2175913 MS |
8821 | } |
8822 | ||
8823 | static void | |
8824 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
8825 | struct cmd_list_element *cmd, const char *value) | |
8826 | { | |
8827 | switch (execution_direction) { | |
8828 | case EXEC_FORWARD: | |
8829 | fprintf_filtered (out, _("Forward.\n")); | |
8830 | break; | |
8831 | case EXEC_REVERSE: | |
8832 | fprintf_filtered (out, _("Reverse.\n")); | |
8833 | break; | |
b2175913 | 8834 | default: |
d8b34453 PA |
8835 | internal_error (__FILE__, __LINE__, |
8836 | _("bogus execution_direction value: %d"), | |
8837 | (int) execution_direction); | |
b2175913 MS |
8838 | } |
8839 | } | |
8840 | ||
d4db2f36 PA |
8841 | static void |
8842 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
8843 | struct cmd_list_element *c, const char *value) | |
8844 | { | |
3e43a32a MS |
8845 | fprintf_filtered (file, _("Resuming the execution of threads " |
8846 | "of all processes is %s.\n"), value); | |
d4db2f36 | 8847 | } |
ad52ddc6 | 8848 | |
22d2b532 SDJ |
8849 | /* Implementation of `siginfo' variable. */ |
8850 | ||
8851 | static const struct internalvar_funcs siginfo_funcs = | |
8852 | { | |
8853 | siginfo_make_value, | |
8854 | NULL, | |
8855 | NULL | |
8856 | }; | |
8857 | ||
372316f1 PA |
8858 | /* Callback for infrun's target events source. This is marked when a |
8859 | thread has a pending status to process. */ | |
8860 | ||
8861 | static void | |
8862 | infrun_async_inferior_event_handler (gdb_client_data data) | |
8863 | { | |
372316f1 PA |
8864 | inferior_event_handler (INF_REG_EVENT, NULL); |
8865 | } | |
8866 | ||
c906108c | 8867 | void |
96baa820 | 8868 | _initialize_infrun (void) |
c906108c | 8869 | { |
52f0bd74 AC |
8870 | int i; |
8871 | int numsigs; | |
de0bea00 | 8872 | struct cmd_list_element *c; |
c906108c | 8873 | |
372316f1 PA |
8874 | /* Register extra event sources in the event loop. */ |
8875 | infrun_async_inferior_event_token | |
8876 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
8877 | ||
1bedd215 AC |
8878 | add_info ("signals", signals_info, _("\ |
8879 | What debugger does when program gets various signals.\n\ | |
8880 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
8881 | add_info_alias ("handle", "signals", 0); |
8882 | ||
de0bea00 | 8883 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 8884 | Specify how to handle signals.\n\ |
486c7739 | 8885 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 8886 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 8887 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
8888 | will be displayed instead.\n\ |
8889 | \n\ | |
c906108c SS |
8890 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
8891 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
8892 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
8893 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 8894 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 8895 | \n\ |
1bedd215 | 8896 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
8897 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
8898 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
8899 | Print means print a message if this signal happens.\n\ | |
8900 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
8901 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
8902 | Pass and Stop may be combined.\n\ |
8903 | \n\ | |
8904 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
8905 | may be interspersed with actions, with the actions being performed for\n\ | |
8906 | all signals cumulatively specified.")); | |
de0bea00 | 8907 | set_cmd_completer (c, handle_completer); |
486c7739 | 8908 | |
c906108c | 8909 | if (!dbx_commands) |
1a966eab AC |
8910 | stop_command = add_cmd ("stop", class_obscure, |
8911 | not_just_help_class_command, _("\ | |
8912 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 8913 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 8914 | of the program stops."), &cmdlist); |
c906108c | 8915 | |
ccce17b0 | 8916 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
8917 | Set inferior debugging."), _("\ |
8918 | Show inferior debugging."), _("\ | |
8919 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
8920 | NULL, |
8921 | show_debug_infrun, | |
8922 | &setdebuglist, &showdebuglist); | |
527159b7 | 8923 | |
3e43a32a MS |
8924 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
8925 | &debug_displaced, _("\ | |
237fc4c9 PA |
8926 | Set displaced stepping debugging."), _("\ |
8927 | Show displaced stepping debugging."), _("\ | |
8928 | When non-zero, displaced stepping specific debugging is enabled."), | |
8929 | NULL, | |
8930 | show_debug_displaced, | |
8931 | &setdebuglist, &showdebuglist); | |
8932 | ||
ad52ddc6 PA |
8933 | add_setshow_boolean_cmd ("non-stop", no_class, |
8934 | &non_stop_1, _("\ | |
8935 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
8936 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
8937 | When debugging a multi-threaded program and this setting is\n\ | |
8938 | off (the default, also called all-stop mode), when one thread stops\n\ | |
8939 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
8940 | all other threads in the program while you interact with the thread of\n\ | |
8941 | interest. When you continue or step a thread, you can allow the other\n\ | |
8942 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
8943 | thread's state, all threads stop.\n\ | |
8944 | \n\ | |
8945 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
8946 | to run freely. You'll be able to step each thread independently,\n\ | |
8947 | leave it stopped or free to run as needed."), | |
8948 | set_non_stop, | |
8949 | show_non_stop, | |
8950 | &setlist, | |
8951 | &showlist); | |
8952 | ||
a493e3e2 | 8953 | numsigs = (int) GDB_SIGNAL_LAST; |
8d749320 SM |
8954 | signal_stop = XNEWVEC (unsigned char, numsigs); |
8955 | signal_print = XNEWVEC (unsigned char, numsigs); | |
8956 | signal_program = XNEWVEC (unsigned char, numsigs); | |
8957 | signal_catch = XNEWVEC (unsigned char, numsigs); | |
8958 | signal_pass = XNEWVEC (unsigned char, numsigs); | |
c906108c SS |
8959 | for (i = 0; i < numsigs; i++) |
8960 | { | |
8961 | signal_stop[i] = 1; | |
8962 | signal_print[i] = 1; | |
8963 | signal_program[i] = 1; | |
ab04a2af | 8964 | signal_catch[i] = 0; |
c906108c SS |
8965 | } |
8966 | ||
4d9d9d04 PA |
8967 | /* Signals caused by debugger's own actions should not be given to |
8968 | the program afterwards. | |
8969 | ||
8970 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
8971 | explicitly specifies that it should be delivered to the target | |
8972 | program. Typically, that would occur when a user is debugging a | |
8973 | target monitor on a simulator: the target monitor sets a | |
8974 | breakpoint; the simulator encounters this breakpoint and halts | |
8975 | the simulation handing control to GDB; GDB, noting that the stop | |
8976 | address doesn't map to any known breakpoint, returns control back | |
8977 | to the simulator; the simulator then delivers the hardware | |
8978 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
8979 | debugged. */ | |
a493e3e2 PA |
8980 | signal_program[GDB_SIGNAL_TRAP] = 0; |
8981 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
8982 | |
8983 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
8984 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
8985 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
8986 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
8987 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
8988 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
8989 | signal_print[GDB_SIGNAL_PROF] = 0; | |
8990 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
8991 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
8992 | signal_stop[GDB_SIGNAL_IO] = 0; | |
8993 | signal_print[GDB_SIGNAL_IO] = 0; | |
8994 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
8995 | signal_print[GDB_SIGNAL_POLL] = 0; | |
8996 | signal_stop[GDB_SIGNAL_URG] = 0; | |
8997 | signal_print[GDB_SIGNAL_URG] = 0; | |
8998 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
8999 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9000 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9001 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9002 | |
cd0fc7c3 SS |
9003 | /* These signals are used internally by user-level thread |
9004 | implementations. (See signal(5) on Solaris.) Like the above | |
9005 | signals, a healthy program receives and handles them as part of | |
9006 | its normal operation. */ | |
a493e3e2 PA |
9007 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9008 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9009 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9010 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9011 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9012 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
cd0fc7c3 | 9013 | |
2455069d UW |
9014 | /* Update cached state. */ |
9015 | signal_cache_update (-1); | |
9016 | ||
85c07804 AC |
9017 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9018 | &stop_on_solib_events, _("\ | |
9019 | Set stopping for shared library events."), _("\ | |
9020 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9021 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9022 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9023 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9024 | set_stop_on_solib_events, |
920d2a44 | 9025 | show_stop_on_solib_events, |
85c07804 | 9026 | &setlist, &showlist); |
c906108c | 9027 | |
7ab04401 AC |
9028 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9029 | follow_fork_mode_kind_names, | |
9030 | &follow_fork_mode_string, _("\ | |
9031 | Set debugger response to a program call of fork or vfork."), _("\ | |
9032 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9033 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9034 | parent - the original process is debugged after a fork\n\ | |
9035 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9036 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9037 | By default, the debugger will follow the parent process."), |
9038 | NULL, | |
920d2a44 | 9039 | show_follow_fork_mode_string, |
7ab04401 AC |
9040 | &setlist, &showlist); |
9041 | ||
6c95b8df PA |
9042 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9043 | follow_exec_mode_names, | |
9044 | &follow_exec_mode_string, _("\ | |
9045 | Set debugger response to a program call of exec."), _("\ | |
9046 | Show debugger response to a program call of exec."), _("\ | |
9047 | An exec call replaces the program image of a process.\n\ | |
9048 | \n\ | |
9049 | follow-exec-mode can be:\n\ | |
9050 | \n\ | |
cce7e648 | 9051 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9052 | to this new inferior. The program the process was running before\n\ |
9053 | the exec call can be restarted afterwards by restarting the original\n\ | |
9054 | inferior.\n\ | |
9055 | \n\ | |
9056 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9057 | The new executable image replaces the previous executable loaded in\n\ | |
9058 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9059 | the executable the process was running after the exec call.\n\ | |
9060 | \n\ | |
9061 | By default, the debugger will use the same inferior."), | |
9062 | NULL, | |
9063 | show_follow_exec_mode_string, | |
9064 | &setlist, &showlist); | |
9065 | ||
7ab04401 AC |
9066 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9067 | scheduler_enums, &scheduler_mode, _("\ | |
9068 | Set mode for locking scheduler during execution."), _("\ | |
9069 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
9070 | off == no locking (threads may preempt at any time)\n\ |
9071 | on == full locking (no thread except the current thread may run)\n\ | |
856e7dd6 PA |
9072 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ |
9073 | In this mode, other threads may run during other commands."), | |
7ab04401 | 9074 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9075 | show_scheduler_mode, |
7ab04401 | 9076 | &setlist, &showlist); |
5fbbeb29 | 9077 | |
d4db2f36 PA |
9078 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9079 | Set mode for resuming threads of all processes."), _("\ | |
9080 | Show mode for resuming threads of all processes."), _("\ | |
9081 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9082 | threads of all processes. When off (which is the default), execution\n\ | |
9083 | commands only resume the threads of the current process. The set of\n\ | |
9084 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9085 | mode (see help set scheduler-locking)."), | |
9086 | NULL, | |
9087 | show_schedule_multiple, | |
9088 | &setlist, &showlist); | |
9089 | ||
5bf193a2 AC |
9090 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9091 | Set mode of the step operation."), _("\ | |
9092 | Show mode of the step operation."), _("\ | |
9093 | When set, doing a step over a function without debug line information\n\ | |
9094 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9095 | function is skipped and the step command stops at a different source line."), | |
9096 | NULL, | |
920d2a44 | 9097 | show_step_stop_if_no_debug, |
5bf193a2 | 9098 | &setlist, &showlist); |
ca6724c1 | 9099 | |
72d0e2c5 YQ |
9100 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9101 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9102 | Set debugger's willingness to use displaced stepping."), _("\ |
9103 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9104 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9105 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9106 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9107 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9108 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9109 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9110 | NULL, |
9111 | show_can_use_displaced_stepping, | |
9112 | &setlist, &showlist); | |
237fc4c9 | 9113 | |
b2175913 MS |
9114 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9115 | &exec_direction, _("Set direction of execution.\n\ | |
9116 | Options are 'forward' or 'reverse'."), | |
9117 | _("Show direction of execution (forward/reverse)."), | |
9118 | _("Tells gdb whether to execute forward or backward."), | |
9119 | set_exec_direction_func, show_exec_direction_func, | |
9120 | &setlist, &showlist); | |
9121 | ||
6c95b8df PA |
9122 | /* Set/show detach-on-fork: user-settable mode. */ |
9123 | ||
9124 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9125 | Set whether gdb will detach the child of a fork."), _("\ | |
9126 | Show whether gdb will detach the child of a fork."), _("\ | |
9127 | Tells gdb whether to detach the child of a fork."), | |
9128 | NULL, NULL, &setlist, &showlist); | |
9129 | ||
03583c20 UW |
9130 | /* Set/show disable address space randomization mode. */ |
9131 | ||
9132 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9133 | &disable_randomization, _("\ | |
9134 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9135 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9136 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9137 | address space is disabled. Standalone programs run with the randomization\n\ | |
9138 | enabled by default on some platforms."), | |
9139 | &set_disable_randomization, | |
9140 | &show_disable_randomization, | |
9141 | &setlist, &showlist); | |
9142 | ||
ca6724c1 | 9143 | /* ptid initializations */ |
ca6724c1 KB |
9144 | inferior_ptid = null_ptid; |
9145 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd PA |
9146 | |
9147 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 9148 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 9149 | observer_attach_thread_exit (infrun_thread_thread_exit); |
fc1cf338 | 9150 | observer_attach_inferior_exit (infrun_inferior_exit); |
4aa995e1 PA |
9151 | |
9152 | /* Explicitly create without lookup, since that tries to create a | |
9153 | value with a void typed value, and when we get here, gdbarch | |
9154 | isn't initialized yet. At this point, we're quite sure there | |
9155 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9156 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9157 | |
9158 | add_setshow_boolean_cmd ("observer", no_class, | |
9159 | &observer_mode_1, _("\ | |
9160 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9161 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9162 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9163 | affect its execution. Registers and memory may not be changed,\n\ | |
9164 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9165 | or signalled."), | |
9166 | set_observer_mode, | |
9167 | show_observer_mode, | |
9168 | &setlist, | |
9169 | &showlist); | |
c906108c | 9170 | } |