Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
b811d2c2 | 4 | Copyright (C) 1986-2020 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" | |
c906108c SS |
28 | #include "gdbcore.h" |
29 | #include "gdbcmd.h" | |
30 | #include "target.h" | |
2f4fcf00 | 31 | #include "target-connection.h" |
c906108c SS |
32 | #include "gdbthread.h" |
33 | #include "annotate.h" | |
1adeb98a | 34 | #include "symfile.h" |
7a292a7a | 35 | #include "top.h" |
2acceee2 | 36 | #include "inf-loop.h" |
4e052eda | 37 | #include "regcache.h" |
fd0407d6 | 38 | #include "value.h" |
76727919 | 39 | #include "observable.h" |
f636b87d | 40 | #include "language.h" |
a77053c2 | 41 | #include "solib.h" |
f17517ea | 42 | #include "main.h" |
186c406b | 43 | #include "block.h" |
034dad6f | 44 | #include "mi/mi-common.h" |
4f8d22e3 | 45 | #include "event-top.h" |
96429cc8 | 46 | #include "record.h" |
d02ed0bb | 47 | #include "record-full.h" |
edb3359d | 48 | #include "inline-frame.h" |
4efc6507 | 49 | #include "jit.h" |
06cd862c | 50 | #include "tracepoint.h" |
1bfeeb0f | 51 | #include "skip.h" |
28106bc2 SDJ |
52 | #include "probe.h" |
53 | #include "objfiles.h" | |
de0bea00 | 54 | #include "completer.h" |
9107fc8d | 55 | #include "target-descriptions.h" |
f15cb84a | 56 | #include "target-dcache.h" |
d83ad864 | 57 | #include "terminal.h" |
ff862be4 | 58 | #include "solist.h" |
372316f1 | 59 | #include "event-loop.h" |
243a9253 | 60 | #include "thread-fsm.h" |
268a13a5 | 61 | #include "gdbsupport/enum-flags.h" |
5ed8105e | 62 | #include "progspace-and-thread.h" |
268a13a5 | 63 | #include "gdbsupport/gdb_optional.h" |
46a62268 | 64 | #include "arch-utils.h" |
268a13a5 TT |
65 | #include "gdbsupport/scope-exit.h" |
66 | #include "gdbsupport/forward-scope-exit.h" | |
5b6d1e4f PA |
67 | #include "gdb_select.h" |
68 | #include <unordered_map> | |
c906108c SS |
69 | |
70 | /* Prototypes for local functions */ | |
71 | ||
2ea28649 | 72 | static void sig_print_info (enum gdb_signal); |
c906108c | 73 | |
96baa820 | 74 | static void sig_print_header (void); |
c906108c | 75 | |
4ef3f3be | 76 | static int follow_fork (void); |
96baa820 | 77 | |
d83ad864 DB |
78 | static int follow_fork_inferior (int follow_child, int detach_fork); |
79 | ||
80 | static void follow_inferior_reset_breakpoints (void); | |
81 | ||
a289b8f6 JK |
82 | static int currently_stepping (struct thread_info *tp); |
83 | ||
2c03e5be | 84 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
85 | |
86 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
87 | ||
2484c66b UW |
88 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
89 | ||
8550d3b3 YQ |
90 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
91 | ||
aff4e175 AB |
92 | static void resume (gdb_signal sig); |
93 | ||
5b6d1e4f PA |
94 | static void wait_for_inferior (inferior *inf); |
95 | ||
372316f1 PA |
96 | /* Asynchronous signal handler registered as event loop source for |
97 | when we have pending events ready to be passed to the core. */ | |
98 | static struct async_event_handler *infrun_async_inferior_event_token; | |
99 | ||
100 | /* Stores whether infrun_async was previously enabled or disabled. | |
101 | Starts off as -1, indicating "never enabled/disabled". */ | |
102 | static int infrun_is_async = -1; | |
103 | ||
104 | /* See infrun.h. */ | |
105 | ||
106 | void | |
107 | infrun_async (int enable) | |
108 | { | |
109 | if (infrun_is_async != enable) | |
110 | { | |
111 | infrun_is_async = enable; | |
112 | ||
113 | if (debug_infrun) | |
114 | fprintf_unfiltered (gdb_stdlog, | |
115 | "infrun: infrun_async(%d)\n", | |
116 | enable); | |
117 | ||
118 | if (enable) | |
119 | mark_async_event_handler (infrun_async_inferior_event_token); | |
120 | else | |
121 | clear_async_event_handler (infrun_async_inferior_event_token); | |
122 | } | |
123 | } | |
124 | ||
0b333c5e PA |
125 | /* See infrun.h. */ |
126 | ||
127 | void | |
128 | mark_infrun_async_event_handler (void) | |
129 | { | |
130 | mark_async_event_handler (infrun_async_inferior_event_token); | |
131 | } | |
132 | ||
5fbbeb29 CF |
133 | /* When set, stop the 'step' command if we enter a function which has |
134 | no line number information. The normal behavior is that we step | |
135 | over such function. */ | |
491144b5 | 136 | bool step_stop_if_no_debug = false; |
920d2a44 AC |
137 | static void |
138 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
139 | struct cmd_list_element *c, const char *value) | |
140 | { | |
141 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
142 | } | |
5fbbeb29 | 143 | |
b9f437de PA |
144 | /* proceed and normal_stop use this to notify the user when the |
145 | inferior stopped in a different thread than it had been running | |
146 | in. */ | |
96baa820 | 147 | |
39f77062 | 148 | static ptid_t previous_inferior_ptid; |
7a292a7a | 149 | |
07107ca6 LM |
150 | /* If set (default for legacy reasons), when following a fork, GDB |
151 | will detach from one of the fork branches, child or parent. | |
152 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
153 | setting. */ | |
154 | ||
491144b5 | 155 | static bool detach_fork = true; |
6c95b8df | 156 | |
491144b5 | 157 | bool debug_displaced = false; |
237fc4c9 PA |
158 | static void |
159 | show_debug_displaced (struct ui_file *file, int from_tty, | |
160 | struct cmd_list_element *c, const char *value) | |
161 | { | |
162 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
163 | } | |
164 | ||
ccce17b0 | 165 | unsigned int debug_infrun = 0; |
920d2a44 AC |
166 | static void |
167 | show_debug_infrun (struct ui_file *file, int from_tty, | |
168 | struct cmd_list_element *c, const char *value) | |
169 | { | |
170 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
171 | } | |
527159b7 | 172 | |
03583c20 UW |
173 | |
174 | /* Support for disabling address space randomization. */ | |
175 | ||
491144b5 | 176 | bool disable_randomization = true; |
03583c20 UW |
177 | |
178 | static void | |
179 | show_disable_randomization (struct ui_file *file, int from_tty, | |
180 | struct cmd_list_element *c, const char *value) | |
181 | { | |
182 | if (target_supports_disable_randomization ()) | |
183 | fprintf_filtered (file, | |
184 | _("Disabling randomization of debuggee's " | |
185 | "virtual address space is %s.\n"), | |
186 | value); | |
187 | else | |
188 | fputs_filtered (_("Disabling randomization of debuggee's " | |
189 | "virtual address space is unsupported on\n" | |
190 | "this platform.\n"), file); | |
191 | } | |
192 | ||
193 | static void | |
eb4c3f4a | 194 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
195 | struct cmd_list_element *c) |
196 | { | |
197 | if (!target_supports_disable_randomization ()) | |
198 | error (_("Disabling randomization of debuggee's " | |
199 | "virtual address space is unsupported on\n" | |
200 | "this platform.")); | |
201 | } | |
202 | ||
d32dc48e PA |
203 | /* User interface for non-stop mode. */ |
204 | ||
491144b5 CB |
205 | bool non_stop = false; |
206 | static bool non_stop_1 = false; | |
d32dc48e PA |
207 | |
208 | static void | |
eb4c3f4a | 209 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
210 | struct cmd_list_element *c) |
211 | { | |
212 | if (target_has_execution) | |
213 | { | |
214 | non_stop_1 = non_stop; | |
215 | error (_("Cannot change this setting while the inferior is running.")); | |
216 | } | |
217 | ||
218 | non_stop = non_stop_1; | |
219 | } | |
220 | ||
221 | static void | |
222 | show_non_stop (struct ui_file *file, int from_tty, | |
223 | struct cmd_list_element *c, const char *value) | |
224 | { | |
225 | fprintf_filtered (file, | |
226 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
227 | value); | |
228 | } | |
229 | ||
d914c394 SS |
230 | /* "Observer mode" is somewhat like a more extreme version of |
231 | non-stop, in which all GDB operations that might affect the | |
232 | target's execution have been disabled. */ | |
233 | ||
491144b5 CB |
234 | bool observer_mode = false; |
235 | static bool observer_mode_1 = false; | |
d914c394 SS |
236 | |
237 | static void | |
eb4c3f4a | 238 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
239 | struct cmd_list_element *c) |
240 | { | |
d914c394 SS |
241 | if (target_has_execution) |
242 | { | |
243 | observer_mode_1 = observer_mode; | |
244 | error (_("Cannot change this setting while the inferior is running.")); | |
245 | } | |
246 | ||
247 | observer_mode = observer_mode_1; | |
248 | ||
249 | may_write_registers = !observer_mode; | |
250 | may_write_memory = !observer_mode; | |
251 | may_insert_breakpoints = !observer_mode; | |
252 | may_insert_tracepoints = !observer_mode; | |
253 | /* We can insert fast tracepoints in or out of observer mode, | |
254 | but enable them if we're going into this mode. */ | |
255 | if (observer_mode) | |
491144b5 | 256 | may_insert_fast_tracepoints = true; |
d914c394 SS |
257 | may_stop = !observer_mode; |
258 | update_target_permissions (); | |
259 | ||
260 | /* Going *into* observer mode we must force non-stop, then | |
261 | going out we leave it that way. */ | |
262 | if (observer_mode) | |
263 | { | |
d914c394 | 264 | pagination_enabled = 0; |
491144b5 | 265 | non_stop = non_stop_1 = true; |
d914c394 SS |
266 | } |
267 | ||
268 | if (from_tty) | |
269 | printf_filtered (_("Observer mode is now %s.\n"), | |
270 | (observer_mode ? "on" : "off")); | |
271 | } | |
272 | ||
273 | static void | |
274 | show_observer_mode (struct ui_file *file, int from_tty, | |
275 | struct cmd_list_element *c, const char *value) | |
276 | { | |
277 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
278 | } | |
279 | ||
280 | /* This updates the value of observer mode based on changes in | |
281 | permissions. Note that we are deliberately ignoring the values of | |
282 | may-write-registers and may-write-memory, since the user may have | |
283 | reason to enable these during a session, for instance to turn on a | |
284 | debugging-related global. */ | |
285 | ||
286 | void | |
287 | update_observer_mode (void) | |
288 | { | |
491144b5 CB |
289 | bool newval = (!may_insert_breakpoints |
290 | && !may_insert_tracepoints | |
291 | && may_insert_fast_tracepoints | |
292 | && !may_stop | |
293 | && non_stop); | |
d914c394 SS |
294 | |
295 | /* Let the user know if things change. */ | |
296 | if (newval != observer_mode) | |
297 | printf_filtered (_("Observer mode is now %s.\n"), | |
298 | (newval ? "on" : "off")); | |
299 | ||
300 | observer_mode = observer_mode_1 = newval; | |
301 | } | |
c2c6d25f | 302 | |
c906108c SS |
303 | /* Tables of how to react to signals; the user sets them. */ |
304 | ||
adc6a863 PA |
305 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
306 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
307 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 308 | |
ab04a2af TT |
309 | /* Table of signals that are registered with "catch signal". A |
310 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
311 | signal" command. */ |
312 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 313 | |
2455069d UW |
314 | /* Table of signals that the target may silently handle. |
315 | This is automatically determined from the flags above, | |
316 | and simply cached here. */ | |
adc6a863 | 317 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 318 | |
c906108c SS |
319 | #define SET_SIGS(nsigs,sigs,flags) \ |
320 | do { \ | |
321 | int signum = (nsigs); \ | |
322 | while (signum-- > 0) \ | |
323 | if ((sigs)[signum]) \ | |
324 | (flags)[signum] = 1; \ | |
325 | } while (0) | |
326 | ||
327 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
328 | do { \ | |
329 | int signum = (nsigs); \ | |
330 | while (signum-- > 0) \ | |
331 | if ((sigs)[signum]) \ | |
332 | (flags)[signum] = 0; \ | |
333 | } while (0) | |
334 | ||
9b224c5e PA |
335 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
336 | this function is to avoid exporting `signal_program'. */ | |
337 | ||
338 | void | |
339 | update_signals_program_target (void) | |
340 | { | |
adc6a863 | 341 | target_program_signals (signal_program); |
9b224c5e PA |
342 | } |
343 | ||
1777feb0 | 344 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 345 | |
edb3359d | 346 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
347 | |
348 | /* Command list pointer for the "stop" placeholder. */ | |
349 | ||
350 | static struct cmd_list_element *stop_command; | |
351 | ||
c906108c SS |
352 | /* Nonzero if we want to give control to the user when we're notified |
353 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 354 | int stop_on_solib_events; |
f9e14852 GB |
355 | |
356 | /* Enable or disable optional shared library event breakpoints | |
357 | as appropriate when the above flag is changed. */ | |
358 | ||
359 | static void | |
eb4c3f4a TT |
360 | set_stop_on_solib_events (const char *args, |
361 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
362 | { |
363 | update_solib_breakpoints (); | |
364 | } | |
365 | ||
920d2a44 AC |
366 | static void |
367 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
368 | struct cmd_list_element *c, const char *value) | |
369 | { | |
370 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
371 | value); | |
372 | } | |
c906108c | 373 | |
c906108c SS |
374 | /* Nonzero after stop if current stack frame should be printed. */ |
375 | ||
376 | static int stop_print_frame; | |
377 | ||
5b6d1e4f PA |
378 | /* This is a cached copy of the target/ptid/waitstatus of the last |
379 | event returned by target_wait()/deprecated_target_wait_hook(). | |
380 | This information is returned by get_last_target_status(). */ | |
381 | static process_stratum_target *target_last_proc_target; | |
39f77062 | 382 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
383 | static struct target_waitstatus target_last_waitstatus; |
384 | ||
4e1c45ea | 385 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 386 | |
53904c9e AC |
387 | static const char follow_fork_mode_child[] = "child"; |
388 | static const char follow_fork_mode_parent[] = "parent"; | |
389 | ||
40478521 | 390 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
391 | follow_fork_mode_child, |
392 | follow_fork_mode_parent, | |
393 | NULL | |
ef346e04 | 394 | }; |
c906108c | 395 | |
53904c9e | 396 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
397 | static void |
398 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
399 | struct cmd_list_element *c, const char *value) | |
400 | { | |
3e43a32a MS |
401 | fprintf_filtered (file, |
402 | _("Debugger response to a program " | |
403 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
404 | value); |
405 | } | |
c906108c SS |
406 | \f |
407 | ||
d83ad864 DB |
408 | /* Handle changes to the inferior list based on the type of fork, |
409 | which process is being followed, and whether the other process | |
410 | should be detached. On entry inferior_ptid must be the ptid of | |
411 | the fork parent. At return inferior_ptid is the ptid of the | |
412 | followed inferior. */ | |
413 | ||
414 | static int | |
415 | follow_fork_inferior (int follow_child, int detach_fork) | |
416 | { | |
417 | int has_vforked; | |
79639e11 | 418 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
419 | |
420 | has_vforked = (inferior_thread ()->pending_follow.kind | |
421 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
422 | parent_ptid = inferior_ptid; |
423 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
424 | |
425 | if (has_vforked | |
426 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 427 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
428 | && !(follow_child || detach_fork || sched_multi)) |
429 | { | |
430 | /* The parent stays blocked inside the vfork syscall until the | |
431 | child execs or exits. If we don't let the child run, then | |
432 | the parent stays blocked. If we're telling the parent to run | |
433 | in the foreground, the user will not be able to ctrl-c to get | |
434 | back the terminal, effectively hanging the debug session. */ | |
435 | fprintf_filtered (gdb_stderr, _("\ | |
436 | Can not resume the parent process over vfork in the foreground while\n\ | |
437 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
438 | \"set schedule-multiple\".\n")); | |
d83ad864 DB |
439 | return 1; |
440 | } | |
441 | ||
442 | if (!follow_child) | |
443 | { | |
444 | /* Detach new forked process? */ | |
445 | if (detach_fork) | |
446 | { | |
d83ad864 DB |
447 | /* Before detaching from the child, remove all breakpoints |
448 | from it. If we forked, then this has already been taken | |
449 | care of by infrun.c. If we vforked however, any | |
450 | breakpoint inserted in the parent is visible in the | |
451 | child, even those added while stopped in a vfork | |
452 | catchpoint. This will remove the breakpoints from the | |
453 | parent also, but they'll be reinserted below. */ | |
454 | if (has_vforked) | |
455 | { | |
456 | /* Keep breakpoints list in sync. */ | |
00431a78 | 457 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
458 | } |
459 | ||
f67c0c91 | 460 | if (print_inferior_events) |
d83ad864 | 461 | { |
8dd06f7a | 462 | /* Ensure that we have a process ptid. */ |
e99b03dc | 463 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 464 | |
223ffa71 | 465 | target_terminal::ours_for_output (); |
d83ad864 | 466 | fprintf_filtered (gdb_stdlog, |
f67c0c91 | 467 | _("[Detaching after %s from child %s]\n"), |
6f259a23 | 468 | has_vforked ? "vfork" : "fork", |
a068643d | 469 | target_pid_to_str (process_ptid).c_str ()); |
d83ad864 DB |
470 | } |
471 | } | |
472 | else | |
473 | { | |
474 | struct inferior *parent_inf, *child_inf; | |
d83ad864 DB |
475 | |
476 | /* Add process to GDB's tables. */ | |
e99b03dc | 477 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
478 | |
479 | parent_inf = current_inferior (); | |
480 | child_inf->attach_flag = parent_inf->attach_flag; | |
481 | copy_terminal_info (child_inf, parent_inf); | |
482 | child_inf->gdbarch = parent_inf->gdbarch; | |
483 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
484 | ||
5ed8105e | 485 | scoped_restore_current_pspace_and_thread restore_pspace_thread; |
d83ad864 | 486 | |
2a00d7ce | 487 | set_current_inferior (child_inf); |
5b6d1e4f | 488 | switch_to_no_thread (); |
d83ad864 | 489 | child_inf->symfile_flags = SYMFILE_NO_READ; |
5b6d1e4f PA |
490 | push_target (parent_inf->process_target ()); |
491 | add_thread_silent (child_inf->process_target (), child_ptid); | |
492 | inferior_ptid = child_ptid; | |
d83ad864 DB |
493 | |
494 | /* If this is a vfork child, then the address-space is | |
495 | shared with the parent. */ | |
496 | if (has_vforked) | |
497 | { | |
498 | child_inf->pspace = parent_inf->pspace; | |
499 | child_inf->aspace = parent_inf->aspace; | |
500 | ||
5b6d1e4f PA |
501 | exec_on_vfork (); |
502 | ||
d83ad864 DB |
503 | /* The parent will be frozen until the child is done |
504 | with the shared region. Keep track of the | |
505 | parent. */ | |
506 | child_inf->vfork_parent = parent_inf; | |
507 | child_inf->pending_detach = 0; | |
508 | parent_inf->vfork_child = child_inf; | |
509 | parent_inf->pending_detach = 0; | |
510 | } | |
511 | else | |
512 | { | |
513 | child_inf->aspace = new_address_space (); | |
564b1e3f | 514 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
515 | child_inf->removable = 1; |
516 | set_current_program_space (child_inf->pspace); | |
517 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
518 | ||
519 | /* Let the shared library layer (e.g., solib-svr4) learn | |
520 | about this new process, relocate the cloned exec, pull | |
521 | in shared libraries, and install the solib event | |
522 | breakpoint. If a "cloned-VM" event was propagated | |
523 | better throughout the core, this wouldn't be | |
524 | required. */ | |
525 | solib_create_inferior_hook (0); | |
526 | } | |
d83ad864 DB |
527 | } |
528 | ||
529 | if (has_vforked) | |
530 | { | |
531 | struct inferior *parent_inf; | |
532 | ||
533 | parent_inf = current_inferior (); | |
534 | ||
535 | /* If we detached from the child, then we have to be careful | |
536 | to not insert breakpoints in the parent until the child | |
537 | is done with the shared memory region. However, if we're | |
538 | staying attached to the child, then we can and should | |
539 | insert breakpoints, so that we can debug it. A | |
540 | subsequent child exec or exit is enough to know when does | |
541 | the child stops using the parent's address space. */ | |
542 | parent_inf->waiting_for_vfork_done = detach_fork; | |
543 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
544 | } | |
545 | } | |
546 | else | |
547 | { | |
548 | /* Follow the child. */ | |
549 | struct inferior *parent_inf, *child_inf; | |
550 | struct program_space *parent_pspace; | |
551 | ||
f67c0c91 | 552 | if (print_inferior_events) |
d83ad864 | 553 | { |
f67c0c91 SDJ |
554 | std::string parent_pid = target_pid_to_str (parent_ptid); |
555 | std::string child_pid = target_pid_to_str (child_ptid); | |
556 | ||
223ffa71 | 557 | target_terminal::ours_for_output (); |
6f259a23 | 558 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
559 | _("[Attaching after %s %s to child %s]\n"), |
560 | parent_pid.c_str (), | |
6f259a23 | 561 | has_vforked ? "vfork" : "fork", |
f67c0c91 | 562 | child_pid.c_str ()); |
d83ad864 DB |
563 | } |
564 | ||
565 | /* Add the new inferior first, so that the target_detach below | |
566 | doesn't unpush the target. */ | |
567 | ||
e99b03dc | 568 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
569 | |
570 | parent_inf = current_inferior (); | |
571 | child_inf->attach_flag = parent_inf->attach_flag; | |
572 | copy_terminal_info (child_inf, parent_inf); | |
573 | child_inf->gdbarch = parent_inf->gdbarch; | |
574 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
575 | ||
576 | parent_pspace = parent_inf->pspace; | |
577 | ||
5b6d1e4f | 578 | process_stratum_target *target = parent_inf->process_target (); |
d83ad864 | 579 | |
5b6d1e4f PA |
580 | { |
581 | /* Hold a strong reference to the target while (maybe) | |
582 | detaching the parent. Otherwise detaching could close the | |
583 | target. */ | |
584 | auto target_ref = target_ops_ref::new_reference (target); | |
585 | ||
586 | /* If we're vforking, we want to hold on to the parent until | |
587 | the child exits or execs. At child exec or exit time we | |
588 | can remove the old breakpoints from the parent and detach | |
589 | or resume debugging it. Otherwise, detach the parent now; | |
590 | we'll want to reuse it's program/address spaces, but we | |
591 | can't set them to the child before removing breakpoints | |
592 | from the parent, otherwise, the breakpoints module could | |
593 | decide to remove breakpoints from the wrong process (since | |
594 | they'd be assigned to the same address space). */ | |
595 | ||
596 | if (has_vforked) | |
597 | { | |
598 | gdb_assert (child_inf->vfork_parent == NULL); | |
599 | gdb_assert (parent_inf->vfork_child == NULL); | |
600 | child_inf->vfork_parent = parent_inf; | |
601 | child_inf->pending_detach = 0; | |
602 | parent_inf->vfork_child = child_inf; | |
603 | parent_inf->pending_detach = detach_fork; | |
604 | parent_inf->waiting_for_vfork_done = 0; | |
605 | } | |
606 | else if (detach_fork) | |
607 | { | |
608 | if (print_inferior_events) | |
609 | { | |
610 | /* Ensure that we have a process ptid. */ | |
611 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
612 | ||
613 | target_terminal::ours_for_output (); | |
614 | fprintf_filtered (gdb_stdlog, | |
615 | _("[Detaching after fork from " | |
616 | "parent %s]\n"), | |
617 | target_pid_to_str (process_ptid).c_str ()); | |
618 | } | |
8dd06f7a | 619 | |
5b6d1e4f PA |
620 | target_detach (parent_inf, 0); |
621 | parent_inf = NULL; | |
622 | } | |
6f259a23 | 623 | |
5b6d1e4f | 624 | /* Note that the detach above makes PARENT_INF dangling. */ |
d83ad864 | 625 | |
5b6d1e4f PA |
626 | /* Add the child thread to the appropriate lists, and switch |
627 | to this new thread, before cloning the program space, and | |
628 | informing the solib layer about this new process. */ | |
d83ad864 | 629 | |
5b6d1e4f PA |
630 | set_current_inferior (child_inf); |
631 | push_target (target); | |
632 | } | |
d83ad864 | 633 | |
5b6d1e4f | 634 | add_thread_silent (target, child_ptid); |
79639e11 | 635 | inferior_ptid = child_ptid; |
d83ad864 DB |
636 | |
637 | /* If this is a vfork child, then the address-space is shared | |
638 | with the parent. If we detached from the parent, then we can | |
639 | reuse the parent's program/address spaces. */ | |
640 | if (has_vforked || detach_fork) | |
641 | { | |
642 | child_inf->pspace = parent_pspace; | |
643 | child_inf->aspace = child_inf->pspace->aspace; | |
5b6d1e4f PA |
644 | |
645 | exec_on_vfork (); | |
d83ad864 DB |
646 | } |
647 | else | |
648 | { | |
649 | child_inf->aspace = new_address_space (); | |
564b1e3f | 650 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
651 | child_inf->removable = 1; |
652 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
653 | set_current_program_space (child_inf->pspace); | |
654 | clone_program_space (child_inf->pspace, parent_pspace); | |
655 | ||
656 | /* Let the shared library layer (e.g., solib-svr4) learn | |
657 | about this new process, relocate the cloned exec, pull in | |
658 | shared libraries, and install the solib event breakpoint. | |
659 | If a "cloned-VM" event was propagated better throughout | |
660 | the core, this wouldn't be required. */ | |
661 | solib_create_inferior_hook (0); | |
662 | } | |
663 | } | |
664 | ||
665 | return target_follow_fork (follow_child, detach_fork); | |
666 | } | |
667 | ||
e58b0e63 PA |
668 | /* Tell the target to follow the fork we're stopped at. Returns true |
669 | if the inferior should be resumed; false, if the target for some | |
670 | reason decided it's best not to resume. */ | |
671 | ||
6604731b | 672 | static int |
4ef3f3be | 673 | follow_fork (void) |
c906108c | 674 | { |
ea1dd7bc | 675 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
676 | int should_resume = 1; |
677 | struct thread_info *tp; | |
678 | ||
679 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
680 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
681 | parent thread structure's run control related fields, not just these. |
682 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
683 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 684 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
685 | CORE_ADDR step_range_start = 0; |
686 | CORE_ADDR step_range_end = 0; | |
687 | struct frame_id step_frame_id = { 0 }; | |
8980e177 | 688 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
689 | |
690 | if (!non_stop) | |
691 | { | |
5b6d1e4f | 692 | process_stratum_target *wait_target; |
e58b0e63 PA |
693 | ptid_t wait_ptid; |
694 | struct target_waitstatus wait_status; | |
695 | ||
696 | /* Get the last target status returned by target_wait(). */ | |
5b6d1e4f | 697 | get_last_target_status (&wait_target, &wait_ptid, &wait_status); |
e58b0e63 PA |
698 | |
699 | /* If not stopped at a fork event, then there's nothing else to | |
700 | do. */ | |
701 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
702 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
703 | return 1; | |
704 | ||
705 | /* Check if we switched over from WAIT_PTID, since the event was | |
706 | reported. */ | |
00431a78 | 707 | if (wait_ptid != minus_one_ptid |
5b6d1e4f PA |
708 | && (current_inferior ()->process_target () != wait_target |
709 | || inferior_ptid != wait_ptid)) | |
e58b0e63 PA |
710 | { |
711 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
712 | target to follow it (in either direction). We'll | |
713 | afterwards refuse to resume, and inform the user what | |
714 | happened. */ | |
5b6d1e4f | 715 | thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid); |
00431a78 | 716 | switch_to_thread (wait_thread); |
e58b0e63 PA |
717 | should_resume = 0; |
718 | } | |
719 | } | |
720 | ||
721 | tp = inferior_thread (); | |
722 | ||
723 | /* If there were any forks/vforks that were caught and are now to be | |
724 | followed, then do so now. */ | |
725 | switch (tp->pending_follow.kind) | |
726 | { | |
727 | case TARGET_WAITKIND_FORKED: | |
728 | case TARGET_WAITKIND_VFORKED: | |
729 | { | |
730 | ptid_t parent, child; | |
731 | ||
732 | /* If the user did a next/step, etc, over a fork call, | |
733 | preserve the stepping state in the fork child. */ | |
734 | if (follow_child && should_resume) | |
735 | { | |
8358c15c JK |
736 | step_resume_breakpoint = clone_momentary_breakpoint |
737 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
738 | step_range_start = tp->control.step_range_start; |
739 | step_range_end = tp->control.step_range_end; | |
740 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
741 | exception_resume_breakpoint |
742 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 743 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
744 | |
745 | /* For now, delete the parent's sr breakpoint, otherwise, | |
746 | parent/child sr breakpoints are considered duplicates, | |
747 | and the child version will not be installed. Remove | |
748 | this when the breakpoints module becomes aware of | |
749 | inferiors and address spaces. */ | |
750 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
751 | tp->control.step_range_start = 0; |
752 | tp->control.step_range_end = 0; | |
753 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 754 | delete_exception_resume_breakpoint (tp); |
8980e177 | 755 | tp->thread_fsm = NULL; |
e58b0e63 PA |
756 | } |
757 | ||
758 | parent = inferior_ptid; | |
759 | child = tp->pending_follow.value.related_pid; | |
760 | ||
5b6d1e4f | 761 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
762 | /* Set up inferior(s) as specified by the caller, and tell the |
763 | target to do whatever is necessary to follow either parent | |
764 | or child. */ | |
765 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
766 | { |
767 | /* Target refused to follow, or there's some other reason | |
768 | we shouldn't resume. */ | |
769 | should_resume = 0; | |
770 | } | |
771 | else | |
772 | { | |
773 | /* This pending follow fork event is now handled, one way | |
774 | or another. The previous selected thread may be gone | |
775 | from the lists by now, but if it is still around, need | |
776 | to clear the pending follow request. */ | |
5b6d1e4f | 777 | tp = find_thread_ptid (parent_targ, parent); |
e58b0e63 PA |
778 | if (tp) |
779 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
780 | ||
781 | /* This makes sure we don't try to apply the "Switched | |
782 | over from WAIT_PID" logic above. */ | |
783 | nullify_last_target_wait_ptid (); | |
784 | ||
1777feb0 | 785 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
786 | if (follow_child) |
787 | { | |
5b6d1e4f | 788 | thread_info *child_thr = find_thread_ptid (parent_targ, child); |
00431a78 | 789 | switch_to_thread (child_thr); |
e58b0e63 PA |
790 | |
791 | /* ... and preserve the stepping state, in case the | |
792 | user was stepping over the fork call. */ | |
793 | if (should_resume) | |
794 | { | |
795 | tp = inferior_thread (); | |
8358c15c JK |
796 | tp->control.step_resume_breakpoint |
797 | = step_resume_breakpoint; | |
16c381f0 JK |
798 | tp->control.step_range_start = step_range_start; |
799 | tp->control.step_range_end = step_range_end; | |
800 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
801 | tp->control.exception_resume_breakpoint |
802 | = exception_resume_breakpoint; | |
8980e177 | 803 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
804 | } |
805 | else | |
806 | { | |
807 | /* If we get here, it was because we're trying to | |
808 | resume from a fork catchpoint, but, the user | |
809 | has switched threads away from the thread that | |
810 | forked. In that case, the resume command | |
811 | issued is most likely not applicable to the | |
812 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 813 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 814 | "before following fork child.")); |
e58b0e63 PA |
815 | } |
816 | ||
817 | /* Reset breakpoints in the child as appropriate. */ | |
818 | follow_inferior_reset_breakpoints (); | |
819 | } | |
e58b0e63 PA |
820 | } |
821 | } | |
822 | break; | |
823 | case TARGET_WAITKIND_SPURIOUS: | |
824 | /* Nothing to follow. */ | |
825 | break; | |
826 | default: | |
827 | internal_error (__FILE__, __LINE__, | |
828 | "Unexpected pending_follow.kind %d\n", | |
829 | tp->pending_follow.kind); | |
830 | break; | |
831 | } | |
c906108c | 832 | |
e58b0e63 | 833 | return should_resume; |
c906108c SS |
834 | } |
835 | ||
d83ad864 | 836 | static void |
6604731b | 837 | follow_inferior_reset_breakpoints (void) |
c906108c | 838 | { |
4e1c45ea PA |
839 | struct thread_info *tp = inferior_thread (); |
840 | ||
6604731b DJ |
841 | /* Was there a step_resume breakpoint? (There was if the user |
842 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
843 | thread number. Cloned step_resume breakpoints are disabled on |
844 | creation, so enable it here now that it is associated with the | |
845 | correct thread. | |
6604731b DJ |
846 | |
847 | step_resumes are a form of bp that are made to be per-thread. | |
848 | Since we created the step_resume bp when the parent process | |
849 | was being debugged, and now are switching to the child process, | |
850 | from the breakpoint package's viewpoint, that's a switch of | |
851 | "threads". We must update the bp's notion of which thread | |
852 | it is for, or it'll be ignored when it triggers. */ | |
853 | ||
8358c15c | 854 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
855 | { |
856 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
857 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
858 | } | |
6604731b | 859 | |
a1aa2221 | 860 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 861 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
862 | { |
863 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
864 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
865 | } | |
186c406b | 866 | |
6604731b DJ |
867 | /* Reinsert all breakpoints in the child. The user may have set |
868 | breakpoints after catching the fork, in which case those | |
869 | were never set in the child, but only in the parent. This makes | |
870 | sure the inserted breakpoints match the breakpoint list. */ | |
871 | ||
872 | breakpoint_re_set (); | |
873 | insert_breakpoints (); | |
c906108c | 874 | } |
c906108c | 875 | |
6c95b8df PA |
876 | /* The child has exited or execed: resume threads of the parent the |
877 | user wanted to be executing. */ | |
878 | ||
879 | static int | |
880 | proceed_after_vfork_done (struct thread_info *thread, | |
881 | void *arg) | |
882 | { | |
883 | int pid = * (int *) arg; | |
884 | ||
00431a78 PA |
885 | if (thread->ptid.pid () == pid |
886 | && thread->state == THREAD_RUNNING | |
887 | && !thread->executing | |
6c95b8df | 888 | && !thread->stop_requested |
a493e3e2 | 889 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df PA |
890 | { |
891 | if (debug_infrun) | |
892 | fprintf_unfiltered (gdb_stdlog, | |
893 | "infrun: resuming vfork parent thread %s\n", | |
a068643d | 894 | target_pid_to_str (thread->ptid).c_str ()); |
6c95b8df | 895 | |
00431a78 | 896 | switch_to_thread (thread); |
70509625 | 897 | clear_proceed_status (0); |
64ce06e4 | 898 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
899 | } |
900 | ||
901 | return 0; | |
902 | } | |
903 | ||
5ed8105e PA |
904 | /* Save/restore inferior_ptid, current program space and current |
905 | inferior. Only use this if the current context points at an exited | |
906 | inferior (and therefore there's no current thread to save). */ | |
907 | class scoped_restore_exited_inferior | |
908 | { | |
909 | public: | |
910 | scoped_restore_exited_inferior () | |
911 | : m_saved_ptid (&inferior_ptid) | |
912 | {} | |
913 | ||
914 | private: | |
915 | scoped_restore_tmpl<ptid_t> m_saved_ptid; | |
916 | scoped_restore_current_program_space m_pspace; | |
917 | scoped_restore_current_inferior m_inferior; | |
918 | }; | |
919 | ||
6c95b8df PA |
920 | /* Called whenever we notice an exec or exit event, to handle |
921 | detaching or resuming a vfork parent. */ | |
922 | ||
923 | static void | |
924 | handle_vfork_child_exec_or_exit (int exec) | |
925 | { | |
926 | struct inferior *inf = current_inferior (); | |
927 | ||
928 | if (inf->vfork_parent) | |
929 | { | |
930 | int resume_parent = -1; | |
931 | ||
932 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
933 | between the parent and the child. Break the bonds. */ |
934 | inferior *vfork_parent = inf->vfork_parent; | |
935 | inf->vfork_parent->vfork_child = NULL; | |
936 | inf->vfork_parent = NULL; | |
6c95b8df | 937 | |
b73715df TV |
938 | /* If the user wanted to detach from the parent, now is the |
939 | time. */ | |
940 | if (vfork_parent->pending_detach) | |
6c95b8df PA |
941 | { |
942 | struct thread_info *tp; | |
6c95b8df PA |
943 | struct program_space *pspace; |
944 | struct address_space *aspace; | |
945 | ||
1777feb0 | 946 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 947 | |
b73715df | 948 | vfork_parent->pending_detach = 0; |
68c9da30 | 949 | |
5ed8105e PA |
950 | gdb::optional<scoped_restore_exited_inferior> |
951 | maybe_restore_inferior; | |
952 | gdb::optional<scoped_restore_current_pspace_and_thread> | |
953 | maybe_restore_thread; | |
954 | ||
955 | /* If we're handling a child exit, then inferior_ptid points | |
956 | at the inferior's pid, not to a thread. */ | |
f50f4e56 | 957 | if (!exec) |
5ed8105e | 958 | maybe_restore_inferior.emplace (); |
f50f4e56 | 959 | else |
5ed8105e | 960 | maybe_restore_thread.emplace (); |
6c95b8df PA |
961 | |
962 | /* We're letting loose of the parent. */ | |
b73715df | 963 | tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 964 | switch_to_thread (tp); |
6c95b8df PA |
965 | |
966 | /* We're about to detach from the parent, which implicitly | |
967 | removes breakpoints from its address space. There's a | |
968 | catch here: we want to reuse the spaces for the child, | |
969 | but, parent/child are still sharing the pspace at this | |
970 | point, although the exec in reality makes the kernel give | |
971 | the child a fresh set of new pages. The problem here is | |
972 | that the breakpoints module being unaware of this, would | |
973 | likely chose the child process to write to the parent | |
974 | address space. Swapping the child temporarily away from | |
975 | the spaces has the desired effect. Yes, this is "sort | |
976 | of" a hack. */ | |
977 | ||
978 | pspace = inf->pspace; | |
979 | aspace = inf->aspace; | |
980 | inf->aspace = NULL; | |
981 | inf->pspace = NULL; | |
982 | ||
f67c0c91 | 983 | if (print_inferior_events) |
6c95b8df | 984 | { |
a068643d | 985 | std::string pidstr |
b73715df | 986 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 987 | |
223ffa71 | 988 | target_terminal::ours_for_output (); |
6c95b8df PA |
989 | |
990 | if (exec) | |
6f259a23 DB |
991 | { |
992 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 993 | _("[Detaching vfork parent %s " |
a068643d | 994 | "after child exec]\n"), pidstr.c_str ()); |
6f259a23 | 995 | } |
6c95b8df | 996 | else |
6f259a23 DB |
997 | { |
998 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 999 | _("[Detaching vfork parent %s " |
a068643d | 1000 | "after child exit]\n"), pidstr.c_str ()); |
6f259a23 | 1001 | } |
6c95b8df PA |
1002 | } |
1003 | ||
b73715df | 1004 | target_detach (vfork_parent, 0); |
6c95b8df PA |
1005 | |
1006 | /* Put it back. */ | |
1007 | inf->pspace = pspace; | |
1008 | inf->aspace = aspace; | |
6c95b8df PA |
1009 | } |
1010 | else if (exec) | |
1011 | { | |
1012 | /* We're staying attached to the parent, so, really give the | |
1013 | child a new address space. */ | |
564b1e3f | 1014 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
1015 | inf->aspace = inf->pspace->aspace; |
1016 | inf->removable = 1; | |
1017 | set_current_program_space (inf->pspace); | |
1018 | ||
b73715df | 1019 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1020 | } |
1021 | else | |
1022 | { | |
6c95b8df PA |
1023 | /* If this is a vfork child exiting, then the pspace and |
1024 | aspaces were shared with the parent. Since we're | |
1025 | reporting the process exit, we'll be mourning all that is | |
1026 | found in the address space, and switching to null_ptid, | |
1027 | preparing to start a new inferior. But, since we don't | |
1028 | want to clobber the parent's address/program spaces, we | |
1029 | go ahead and create a new one for this exiting | |
1030 | inferior. */ | |
1031 | ||
5ed8105e PA |
1032 | /* Switch to null_ptid while running clone_program_space, so |
1033 | that clone_program_space doesn't want to read the | |
1034 | selected frame of a dead process. */ | |
1035 | scoped_restore restore_ptid | |
1036 | = make_scoped_restore (&inferior_ptid, null_ptid); | |
6c95b8df | 1037 | |
53af73bf PA |
1038 | inf->pspace = new program_space (maybe_new_address_space ()); |
1039 | inf->aspace = inf->pspace->aspace; | |
1040 | set_current_program_space (inf->pspace); | |
6c95b8df | 1041 | inf->removable = 1; |
7dcd53a0 | 1042 | inf->symfile_flags = SYMFILE_NO_READ; |
53af73bf | 1043 | clone_program_space (inf->pspace, vfork_parent->pspace); |
6c95b8df | 1044 | |
b73715df | 1045 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1046 | } |
1047 | ||
6c95b8df PA |
1048 | gdb_assert (current_program_space == inf->pspace); |
1049 | ||
1050 | if (non_stop && resume_parent != -1) | |
1051 | { | |
1052 | /* If the user wanted the parent to be running, let it go | |
1053 | free now. */ | |
5ed8105e | 1054 | scoped_restore_current_thread restore_thread; |
6c95b8df PA |
1055 | |
1056 | if (debug_infrun) | |
3e43a32a MS |
1057 | fprintf_unfiltered (gdb_stdlog, |
1058 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
1059 | resume_parent); |
1060 | ||
1061 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1062 | } |
1063 | } | |
1064 | } | |
1065 | ||
eb6c553b | 1066 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1067 | |
1068 | static const char follow_exec_mode_new[] = "new"; | |
1069 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1070 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1071 | { |
1072 | follow_exec_mode_new, | |
1073 | follow_exec_mode_same, | |
1074 | NULL, | |
1075 | }; | |
1076 | ||
1077 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1078 | static void | |
1079 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1080 | struct cmd_list_element *c, const char *value) | |
1081 | { | |
1082 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1083 | } | |
1084 | ||
ecf45d2c | 1085 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1086 | |
c906108c | 1087 | static void |
4ca51187 | 1088 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1089 | { |
6c95b8df | 1090 | struct inferior *inf = current_inferior (); |
e99b03dc | 1091 | int pid = ptid.pid (); |
94585166 | 1092 | ptid_t process_ptid; |
7a292a7a | 1093 | |
65d2b333 PW |
1094 | /* Switch terminal for any messages produced e.g. by |
1095 | breakpoint_re_set. */ | |
1096 | target_terminal::ours_for_output (); | |
1097 | ||
c906108c SS |
1098 | /* This is an exec event that we actually wish to pay attention to. |
1099 | Refresh our symbol table to the newly exec'd program, remove any | |
1100 | momentary bp's, etc. | |
1101 | ||
1102 | If there are breakpoints, they aren't really inserted now, | |
1103 | since the exec() transformed our inferior into a fresh set | |
1104 | of instructions. | |
1105 | ||
1106 | We want to preserve symbolic breakpoints on the list, since | |
1107 | we have hopes that they can be reset after the new a.out's | |
1108 | symbol table is read. | |
1109 | ||
1110 | However, any "raw" breakpoints must be removed from the list | |
1111 | (e.g., the solib bp's), since their address is probably invalid | |
1112 | now. | |
1113 | ||
1114 | And, we DON'T want to call delete_breakpoints() here, since | |
1115 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1116 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1117 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1118 | |
1119 | mark_breakpoints_out (); | |
1120 | ||
95e50b27 PA |
1121 | /* The target reports the exec event to the main thread, even if |
1122 | some other thread does the exec, and even if the main thread was | |
1123 | stopped or already gone. We may still have non-leader threads of | |
1124 | the process on our list. E.g., on targets that don't have thread | |
1125 | exit events (like remote); or on native Linux in non-stop mode if | |
1126 | there were only two threads in the inferior and the non-leader | |
1127 | one is the one that execs (and nothing forces an update of the | |
1128 | thread list up to here). When debugging remotely, it's best to | |
1129 | avoid extra traffic, when possible, so avoid syncing the thread | |
1130 | list with the target, and instead go ahead and delete all threads | |
1131 | of the process but one that reported the event. Note this must | |
1132 | be done before calling update_breakpoints_after_exec, as | |
1133 | otherwise clearing the threads' resources would reference stale | |
1134 | thread breakpoints -- it may have been one of these threads that | |
1135 | stepped across the exec. We could just clear their stepping | |
1136 | states, but as long as we're iterating, might as well delete | |
1137 | them. Deleting them now rather than at the next user-visible | |
1138 | stop provides a nicer sequence of events for user and MI | |
1139 | notifications. */ | |
08036331 | 1140 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1141 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1142 | delete_thread (th); |
95e50b27 PA |
1143 | |
1144 | /* We also need to clear any left over stale state for the | |
1145 | leader/event thread. E.g., if there was any step-resume | |
1146 | breakpoint or similar, it's gone now. We cannot truly | |
1147 | step-to-next statement through an exec(). */ | |
08036331 | 1148 | thread_info *th = inferior_thread (); |
8358c15c | 1149 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1150 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1151 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1152 | th->control.step_range_start = 0; |
1153 | th->control.step_range_end = 0; | |
c906108c | 1154 | |
95e50b27 PA |
1155 | /* The user may have had the main thread held stopped in the |
1156 | previous image (e.g., schedlock on, or non-stop). Release | |
1157 | it now. */ | |
a75724bc PA |
1158 | th->stop_requested = 0; |
1159 | ||
95e50b27 PA |
1160 | update_breakpoints_after_exec (); |
1161 | ||
1777feb0 | 1162 | /* What is this a.out's name? */ |
f2907e49 | 1163 | process_ptid = ptid_t (pid); |
6c95b8df | 1164 | printf_unfiltered (_("%s is executing new program: %s\n"), |
a068643d | 1165 | target_pid_to_str (process_ptid).c_str (), |
ecf45d2c | 1166 | exec_file_target); |
c906108c SS |
1167 | |
1168 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1169 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1170 | |
6ca15a4b | 1171 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1172 | |
797bc1cb TT |
1173 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1174 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1175 | |
ecf45d2c SL |
1176 | /* If we were unable to map the executable target pathname onto a host |
1177 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1178 | is confusing. Maybe it would even be better to stop at this point | |
1179 | so that the user can specify a file manually before continuing. */ | |
1180 | if (exec_file_host == NULL) | |
1181 | warning (_("Could not load symbols for executable %s.\n" | |
1182 | "Do you need \"set sysroot\"?"), | |
1183 | exec_file_target); | |
c906108c | 1184 | |
cce9b6bf PA |
1185 | /* Reset the shared library package. This ensures that we get a |
1186 | shlib event when the child reaches "_start", at which point the | |
1187 | dld will have had a chance to initialize the child. */ | |
1188 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1189 | we don't want those to be satisfied by the libraries of the | |
1190 | previous incarnation of this process. */ | |
1191 | no_shared_libraries (NULL, 0); | |
1192 | ||
6c95b8df PA |
1193 | if (follow_exec_mode_string == follow_exec_mode_new) |
1194 | { | |
6c95b8df PA |
1195 | /* The user wants to keep the old inferior and program spaces |
1196 | around. Create a new fresh one, and switch to it. */ | |
1197 | ||
35ed81d4 SM |
1198 | /* Do exit processing for the original inferior before setting the new |
1199 | inferior's pid. Having two inferiors with the same pid would confuse | |
1200 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1201 | old to the new inferior. */ | |
1202 | inf = add_inferior_with_spaces (); | |
1203 | swap_terminal_info (inf, current_inferior ()); | |
057302ce | 1204 | exit_inferior_silent (current_inferior ()); |
17d8546e | 1205 | |
94585166 | 1206 | inf->pid = pid; |
ecf45d2c | 1207 | target_follow_exec (inf, exec_file_target); |
6c95b8df | 1208 | |
5b6d1e4f PA |
1209 | inferior *org_inferior = current_inferior (); |
1210 | switch_to_inferior_no_thread (inf); | |
1211 | push_target (org_inferior->process_target ()); | |
1212 | thread_info *thr = add_thread (inf->process_target (), ptid); | |
1213 | switch_to_thread (thr); | |
6c95b8df | 1214 | } |
9107fc8d PA |
1215 | else |
1216 | { | |
1217 | /* The old description may no longer be fit for the new image. | |
1218 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1219 | old description; we'll read a new one below. No need to do | |
1220 | this on "follow-exec-mode new", as the old inferior stays | |
1221 | around (its description is later cleared/refetched on | |
1222 | restart). */ | |
1223 | target_clear_description (); | |
1224 | } | |
6c95b8df PA |
1225 | |
1226 | gdb_assert (current_program_space == inf->pspace); | |
1227 | ||
ecf45d2c SL |
1228 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1229 | because the proper displacement for a PIE (Position Independent | |
1230 | Executable) main symbol file will only be computed by | |
1231 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1232 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1233 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1234 | |
9107fc8d PA |
1235 | /* If the target can specify a description, read it. Must do this |
1236 | after flipping to the new executable (because the target supplied | |
1237 | description must be compatible with the executable's | |
1238 | architecture, and the old executable may e.g., be 32-bit, while | |
1239 | the new one 64-bit), and before anything involving memory or | |
1240 | registers. */ | |
1241 | target_find_description (); | |
1242 | ||
268a4a75 | 1243 | solib_create_inferior_hook (0); |
c906108c | 1244 | |
4efc6507 DE |
1245 | jit_inferior_created_hook (); |
1246 | ||
c1e56572 JK |
1247 | breakpoint_re_set (); |
1248 | ||
c906108c SS |
1249 | /* Reinsert all breakpoints. (Those which were symbolic have |
1250 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1251 | to symbol_file_command...). */ |
c906108c SS |
1252 | insert_breakpoints (); |
1253 | ||
1254 | /* The next resume of this inferior should bring it to the shlib | |
1255 | startup breakpoints. (If the user had also set bp's on | |
1256 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1257 | matically get reset there in the new process.). */ |
c906108c SS |
1258 | } |
1259 | ||
c2829269 PA |
1260 | /* The queue of threads that need to do a step-over operation to get |
1261 | past e.g., a breakpoint. What technique is used to step over the | |
1262 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1263 | same queue, to maintain rough temporal order of execution, in order | |
1264 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1265 | constantly stepping the same couple threads past their breakpoints | |
1266 | over and over, if the single-step finish fast enough. */ | |
1267 | struct thread_info *step_over_queue_head; | |
1268 | ||
6c4cfb24 PA |
1269 | /* Bit flags indicating what the thread needs to step over. */ |
1270 | ||
8d297bbf | 1271 | enum step_over_what_flag |
6c4cfb24 PA |
1272 | { |
1273 | /* Step over a breakpoint. */ | |
1274 | STEP_OVER_BREAKPOINT = 1, | |
1275 | ||
1276 | /* Step past a non-continuable watchpoint, in order to let the | |
1277 | instruction execute so we can evaluate the watchpoint | |
1278 | expression. */ | |
1279 | STEP_OVER_WATCHPOINT = 2 | |
1280 | }; | |
8d297bbf | 1281 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1282 | |
963f9c80 | 1283 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1284 | |
1285 | struct step_over_info | |
1286 | { | |
963f9c80 PA |
1287 | /* If we're stepping past a breakpoint, this is the address space |
1288 | and address of the instruction the breakpoint is set at. We'll | |
1289 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1290 | non-NULL. */ | |
8b86c959 | 1291 | const address_space *aspace; |
31e77af2 | 1292 | CORE_ADDR address; |
963f9c80 PA |
1293 | |
1294 | /* The instruction being stepped over triggers a nonsteppable | |
1295 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1296 | int nonsteppable_watchpoint_p; | |
21edc42f YQ |
1297 | |
1298 | /* The thread's global number. */ | |
1299 | int thread; | |
31e77af2 PA |
1300 | }; |
1301 | ||
1302 | /* The step-over info of the location that is being stepped over. | |
1303 | ||
1304 | Note that with async/breakpoint always-inserted mode, a user might | |
1305 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1306 | being stepped over. As setting a new breakpoint inserts all | |
1307 | breakpoints, we need to make sure the breakpoint being stepped over | |
1308 | isn't inserted then. We do that by only clearing the step-over | |
1309 | info when the step-over is actually finished (or aborted). | |
1310 | ||
1311 | Presently GDB can only step over one breakpoint at any given time. | |
1312 | Given threads that can't run code in the same address space as the | |
1313 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1314 | to step-over at most one breakpoint per address space (so this info | |
1315 | could move to the address space object if/when GDB is extended). | |
1316 | The set of breakpoints being stepped over will normally be much | |
1317 | smaller than the set of all breakpoints, so a flag in the | |
1318 | breakpoint location structure would be wasteful. A separate list | |
1319 | also saves complexity and run-time, as otherwise we'd have to go | |
1320 | through all breakpoint locations clearing their flag whenever we | |
1321 | start a new sequence. Similar considerations weigh against storing | |
1322 | this info in the thread object. Plus, not all step overs actually | |
1323 | have breakpoint locations -- e.g., stepping past a single-step | |
1324 | breakpoint, or stepping to complete a non-continuable | |
1325 | watchpoint. */ | |
1326 | static struct step_over_info step_over_info; | |
1327 | ||
1328 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1329 | stepping over. |
1330 | N.B. We record the aspace and address now, instead of say just the thread, | |
1331 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1332 | |
1333 | static void | |
8b86c959 | 1334 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1335 | int nonsteppable_watchpoint_p, |
1336 | int thread) | |
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; |
21edc42f | 1341 | step_over_info.thread = thread; |
31e77af2 PA |
1342 | } |
1343 | ||
1344 | /* Called when we're not longer stepping over a breakpoint / an | |
1345 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1346 | ||
1347 | static void | |
1348 | clear_step_over_info (void) | |
1349 | { | |
372316f1 PA |
1350 | if (debug_infrun) |
1351 | fprintf_unfiltered (gdb_stdlog, | |
1352 | "infrun: clear_step_over_info\n"); | |
31e77af2 PA |
1353 | step_over_info.aspace = NULL; |
1354 | step_over_info.address = 0; | |
963f9c80 | 1355 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1356 | step_over_info.thread = -1; |
31e77af2 PA |
1357 | } |
1358 | ||
7f89fd65 | 1359 | /* See infrun.h. */ |
31e77af2 PA |
1360 | |
1361 | int | |
1362 | stepping_past_instruction_at (struct address_space *aspace, | |
1363 | CORE_ADDR address) | |
1364 | { | |
1365 | return (step_over_info.aspace != NULL | |
1366 | && breakpoint_address_match (aspace, address, | |
1367 | step_over_info.aspace, | |
1368 | step_over_info.address)); | |
1369 | } | |
1370 | ||
963f9c80 PA |
1371 | /* See infrun.h. */ |
1372 | ||
21edc42f YQ |
1373 | int |
1374 | thread_is_stepping_over_breakpoint (int thread) | |
1375 | { | |
1376 | return (step_over_info.thread != -1 | |
1377 | && thread == step_over_info.thread); | |
1378 | } | |
1379 | ||
1380 | /* See infrun.h. */ | |
1381 | ||
963f9c80 PA |
1382 | int |
1383 | stepping_past_nonsteppable_watchpoint (void) | |
1384 | { | |
1385 | return step_over_info.nonsteppable_watchpoint_p; | |
1386 | } | |
1387 | ||
6cc83d2a PA |
1388 | /* Returns true if step-over info is valid. */ |
1389 | ||
1390 | static int | |
1391 | step_over_info_valid_p (void) | |
1392 | { | |
963f9c80 PA |
1393 | return (step_over_info.aspace != NULL |
1394 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1395 | } |
1396 | ||
c906108c | 1397 | \f |
237fc4c9 PA |
1398 | /* Displaced stepping. */ |
1399 | ||
1400 | /* In non-stop debugging mode, we must take special care to manage | |
1401 | breakpoints properly; in particular, the traditional strategy for | |
1402 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1403 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1404 | breakpoint it has hit while ensuring that other threads running | |
1405 | concurrently will hit the breakpoint as they should. | |
1406 | ||
1407 | The traditional way to step a thread T off a breakpoint in a | |
1408 | multi-threaded program in all-stop mode is as follows: | |
1409 | ||
1410 | a0) Initially, all threads are stopped, and breakpoints are not | |
1411 | inserted. | |
1412 | a1) We single-step T, leaving breakpoints uninserted. | |
1413 | a2) We insert breakpoints, and resume all threads. | |
1414 | ||
1415 | In non-stop debugging, however, this strategy is unsuitable: we | |
1416 | don't want to have to stop all threads in the system in order to | |
1417 | continue or step T past a breakpoint. Instead, we use displaced | |
1418 | stepping: | |
1419 | ||
1420 | n0) Initially, T is stopped, other threads are running, and | |
1421 | breakpoints are inserted. | |
1422 | n1) We copy the instruction "under" the breakpoint to a separate | |
1423 | location, outside the main code stream, making any adjustments | |
1424 | to the instruction, register, and memory state as directed by | |
1425 | T's architecture. | |
1426 | n2) We single-step T over the instruction at its new location. | |
1427 | n3) We adjust the resulting register and memory state as directed | |
1428 | by T's architecture. This includes resetting T's PC to point | |
1429 | back into the main instruction stream. | |
1430 | n4) We resume T. | |
1431 | ||
1432 | This approach depends on the following gdbarch methods: | |
1433 | ||
1434 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1435 | indicate where to copy the instruction, and how much space must | |
1436 | be reserved there. We use these in step n1. | |
1437 | ||
1438 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1439 | address, and makes any necessary adjustments to the instruction, | |
1440 | register contents, and memory. We use this in step n1. | |
1441 | ||
1442 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1443 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1444 | same effect the instruction would have had if we had executed it |
1445 | at its original address. We use this in step n3. | |
1446 | ||
237fc4c9 PA |
1447 | The gdbarch_displaced_step_copy_insn and |
1448 | gdbarch_displaced_step_fixup functions must be written so that | |
1449 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1450 | single-stepping across the copied instruction, and then applying | |
1451 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1452 | thread's memory and registers as stepping the instruction in place | |
1453 | would have. Exactly which responsibilities fall to the copy and | |
1454 | which fall to the fixup is up to the author of those functions. | |
1455 | ||
1456 | See the comments in gdbarch.sh for details. | |
1457 | ||
1458 | Note that displaced stepping and software single-step cannot | |
1459 | currently be used in combination, although with some care I think | |
1460 | they could be made to. Software single-step works by placing | |
1461 | breakpoints on all possible subsequent instructions; if the | |
1462 | displaced instruction is a PC-relative jump, those breakpoints | |
1463 | could fall in very strange places --- on pages that aren't | |
1464 | executable, or at addresses that are not proper instruction | |
1465 | boundaries. (We do generally let other threads run while we wait | |
1466 | to hit the software single-step breakpoint, and they might | |
1467 | encounter such a corrupted instruction.) One way to work around | |
1468 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1469 | simulate the effect of PC-relative instructions (and return NULL) | |
1470 | on architectures that use software single-stepping. | |
1471 | ||
1472 | In non-stop mode, we can have independent and simultaneous step | |
1473 | requests, so more than one thread may need to simultaneously step | |
1474 | over a breakpoint. The current implementation assumes there is | |
1475 | only one scratch space per process. In this case, we have to | |
1476 | serialize access to the scratch space. If thread A wants to step | |
1477 | over a breakpoint, but we are currently waiting for some other | |
1478 | thread to complete a displaced step, we leave thread A stopped and | |
1479 | place it in the displaced_step_request_queue. Whenever a displaced | |
1480 | step finishes, we pick the next thread in the queue and start a new | |
1481 | displaced step operation on it. See displaced_step_prepare and | |
1482 | displaced_step_fixup for details. */ | |
1483 | ||
cfba9872 SM |
1484 | /* Default destructor for displaced_step_closure. */ |
1485 | ||
1486 | displaced_step_closure::~displaced_step_closure () = default; | |
1487 | ||
fc1cf338 PA |
1488 | /* Get the displaced stepping state of process PID. */ |
1489 | ||
39a36629 | 1490 | static displaced_step_inferior_state * |
00431a78 | 1491 | get_displaced_stepping_state (inferior *inf) |
fc1cf338 | 1492 | { |
d20172fc | 1493 | return &inf->displaced_step_state; |
fc1cf338 PA |
1494 | } |
1495 | ||
372316f1 PA |
1496 | /* Returns true if any inferior has a thread doing a displaced |
1497 | step. */ | |
1498 | ||
39a36629 SM |
1499 | static bool |
1500 | displaced_step_in_progress_any_inferior () | |
372316f1 | 1501 | { |
d20172fc | 1502 | for (inferior *i : all_inferiors ()) |
39a36629 | 1503 | { |
d20172fc | 1504 | if (i->displaced_step_state.step_thread != nullptr) |
39a36629 SM |
1505 | return true; |
1506 | } | |
372316f1 | 1507 | |
39a36629 | 1508 | return false; |
372316f1 PA |
1509 | } |
1510 | ||
c0987663 YQ |
1511 | /* Return true if thread represented by PTID is doing a displaced |
1512 | step. */ | |
1513 | ||
1514 | static int | |
00431a78 | 1515 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1516 | { |
00431a78 | 1517 | gdb_assert (thread != NULL); |
c0987663 | 1518 | |
d20172fc | 1519 | return get_displaced_stepping_state (thread->inf)->step_thread == thread; |
c0987663 YQ |
1520 | } |
1521 | ||
8f572e5c PA |
1522 | /* Return true if process PID has a thread doing a displaced step. */ |
1523 | ||
1524 | static int | |
00431a78 | 1525 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1526 | { |
d20172fc | 1527 | return get_displaced_stepping_state (inf)->step_thread != nullptr; |
fc1cf338 PA |
1528 | } |
1529 | ||
a42244db YQ |
1530 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1531 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1532 | return NULL. */ | |
1533 | ||
1534 | struct displaced_step_closure* | |
1535 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1536 | { | |
d20172fc | 1537 | displaced_step_inferior_state *displaced |
00431a78 | 1538 | = get_displaced_stepping_state (current_inferior ()); |
a42244db YQ |
1539 | |
1540 | /* If checking the mode of displaced instruction in copy area. */ | |
d20172fc | 1541 | if (displaced->step_thread != nullptr |
00431a78 | 1542 | && displaced->step_copy == addr) |
d8d83535 | 1543 | return displaced->step_closure.get (); |
a42244db YQ |
1544 | |
1545 | return NULL; | |
1546 | } | |
1547 | ||
fc1cf338 PA |
1548 | static void |
1549 | infrun_inferior_exit (struct inferior *inf) | |
1550 | { | |
d20172fc | 1551 | inf->displaced_step_state.reset (); |
fc1cf338 | 1552 | } |
237fc4c9 | 1553 | |
fff08868 HZ |
1554 | /* If ON, and the architecture supports it, GDB will use displaced |
1555 | stepping to step over breakpoints. If OFF, or if the architecture | |
1556 | doesn't support it, GDB will instead use the traditional | |
1557 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1558 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1559 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1560 | |
72d0e2c5 | 1561 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1562 | |
237fc4c9 PA |
1563 | static void |
1564 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1565 | struct cmd_list_element *c, | |
1566 | const char *value) | |
1567 | { | |
72d0e2c5 | 1568 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1569 | fprintf_filtered (file, |
1570 | _("Debugger's willingness to use displaced stepping " | |
1571 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1572 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1573 | else |
3e43a32a MS |
1574 | fprintf_filtered (file, |
1575 | _("Debugger's willingness to use displaced stepping " | |
1576 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1577 | } |
1578 | ||
9822cb57 SM |
1579 | /* Return true if the gdbarch implements the required methods to use |
1580 | displaced stepping. */ | |
1581 | ||
1582 | static bool | |
1583 | gdbarch_supports_displaced_stepping (gdbarch *arch) | |
1584 | { | |
1585 | /* Only check for the presence of step_copy_insn. Other required methods | |
1586 | are checked by the gdbarch validation. */ | |
1587 | return gdbarch_displaced_step_copy_insn_p (arch); | |
1588 | } | |
1589 | ||
fff08868 | 1590 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1591 | over breakpoints of thread TP. */ |
fff08868 | 1592 | |
9822cb57 SM |
1593 | static bool |
1594 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1595 | { |
9822cb57 SM |
1596 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1597 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1598 | return false; | |
1599 | ||
1600 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1601 | way. */ | |
1602 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1603 | && !target_is_non_stop_p ()) | |
1604 | return false; | |
1605 | ||
1606 | gdbarch *gdbarch = get_thread_regcache (tp)->arch (); | |
1607 | ||
1608 | /* If the architecture doesn't implement displaced stepping, don't use | |
1609 | it. */ | |
1610 | if (!gdbarch_supports_displaced_stepping (gdbarch)) | |
1611 | return false; | |
1612 | ||
1613 | /* If recording, don't use displaced stepping. */ | |
1614 | if (find_record_target () != nullptr) | |
1615 | return false; | |
1616 | ||
d20172fc SM |
1617 | displaced_step_inferior_state *displaced_state |
1618 | = get_displaced_stepping_state (tp->inf); | |
3fc8eb30 | 1619 | |
9822cb57 SM |
1620 | /* If displaced stepping failed before for this inferior, don't bother trying |
1621 | again. */ | |
1622 | if (displaced_state->failed_before) | |
1623 | return false; | |
1624 | ||
1625 | return true; | |
237fc4c9 PA |
1626 | } |
1627 | ||
d8d83535 SM |
1628 | /* Simple function wrapper around displaced_step_inferior_state::reset. */ |
1629 | ||
237fc4c9 | 1630 | static void |
d8d83535 | 1631 | displaced_step_reset (displaced_step_inferior_state *displaced) |
237fc4c9 | 1632 | { |
d8d83535 | 1633 | displaced->reset (); |
237fc4c9 PA |
1634 | } |
1635 | ||
d8d83535 SM |
1636 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1637 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1638 | ||
1639 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 PA |
1640 | |
1641 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1642 | void | |
1643 | displaced_step_dump_bytes (struct ui_file *file, | |
1644 | const gdb_byte *buf, | |
1645 | size_t len) | |
1646 | { | |
1647 | int i; | |
1648 | ||
1649 | for (i = 0; i < len; i++) | |
1650 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1651 | fputs_unfiltered ("\n", file); | |
1652 | } | |
1653 | ||
1654 | /* Prepare to single-step, using displaced stepping. | |
1655 | ||
1656 | Note that we cannot use displaced stepping when we have a signal to | |
1657 | deliver. If we have a signal to deliver and an instruction to step | |
1658 | over, then after the step, there will be no indication from the | |
1659 | target whether the thread entered a signal handler or ignored the | |
1660 | signal and stepped over the instruction successfully --- both cases | |
1661 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1662 | fixup, and in the second case we must --- but we can't tell which. | |
1663 | Comments in the code for 'random signals' in handle_inferior_event | |
1664 | explain how we handle this case instead. | |
1665 | ||
1666 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1667 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1668 | if this instruction can't be displaced stepped. */ | |
1669 | ||
237fc4c9 | 1670 | static int |
00431a78 | 1671 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1672 | { |
00431a78 | 1673 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1674 | struct gdbarch *gdbarch = regcache->arch (); |
8b86c959 | 1675 | const address_space *aspace = regcache->aspace (); |
237fc4c9 PA |
1676 | CORE_ADDR original, copy; |
1677 | ULONGEST len; | |
9e529e1d | 1678 | int status; |
237fc4c9 PA |
1679 | |
1680 | /* We should never reach this function if the architecture does not | |
1681 | support displaced stepping. */ | |
9822cb57 | 1682 | gdb_assert (gdbarch_supports_displaced_stepping (gdbarch)); |
237fc4c9 | 1683 | |
c2829269 PA |
1684 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1685 | gdb_assert (tp->control.trap_expected); | |
1686 | ||
c1e36e3e PA |
1687 | /* Disable range stepping while executing in the scratch pad. We |
1688 | want a single-step even if executing the displaced instruction in | |
1689 | the scratch buffer lands within the stepping range (e.g., a | |
1690 | jump/branch). */ | |
1691 | tp->control.may_range_step = 0; | |
1692 | ||
fc1cf338 PA |
1693 | /* We have to displaced step one thread at a time, as we only have |
1694 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1695 | |
d20172fc SM |
1696 | displaced_step_inferior_state *displaced |
1697 | = get_displaced_stepping_state (tp->inf); | |
fc1cf338 | 1698 | |
00431a78 | 1699 | if (displaced->step_thread != nullptr) |
237fc4c9 PA |
1700 | { |
1701 | /* Already waiting for a displaced step to finish. Defer this | |
1702 | request and place in queue. */ | |
237fc4c9 PA |
1703 | |
1704 | if (debug_displaced) | |
1705 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1706 | "displaced: deferring step of %s\n", |
a068643d | 1707 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 | 1708 | |
c2829269 | 1709 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1710 | return 0; |
1711 | } | |
1712 | else | |
1713 | { | |
1714 | if (debug_displaced) | |
1715 | fprintf_unfiltered (gdb_stdlog, | |
1716 | "displaced: stepping %s now\n", | |
a068643d | 1717 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 PA |
1718 | } |
1719 | ||
d8d83535 | 1720 | displaced_step_reset (displaced); |
237fc4c9 | 1721 | |
00431a78 PA |
1722 | scoped_restore_current_thread restore_thread; |
1723 | ||
1724 | switch_to_thread (tp); | |
ad53cd71 | 1725 | |
515630c5 | 1726 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1727 | |
1728 | copy = gdbarch_displaced_step_location (gdbarch); | |
1729 | len = gdbarch_max_insn_length (gdbarch); | |
1730 | ||
d35ae833 PA |
1731 | if (breakpoint_in_range_p (aspace, copy, len)) |
1732 | { | |
1733 | /* There's a breakpoint set in the scratch pad location range | |
1734 | (which is usually around the entry point). We'd either | |
1735 | install it before resuming, which would overwrite/corrupt the | |
1736 | scratch pad, or if it was already inserted, this displaced | |
1737 | step would overwrite it. The latter is OK in the sense that | |
1738 | we already assume that no thread is going to execute the code | |
1739 | in the scratch pad range (after initial startup) anyway, but | |
1740 | the former is unacceptable. Simply punt and fallback to | |
1741 | stepping over this breakpoint in-line. */ | |
1742 | if (debug_displaced) | |
1743 | { | |
1744 | fprintf_unfiltered (gdb_stdlog, | |
1745 | "displaced: breakpoint set in scratch pad. " | |
1746 | "Stepping over breakpoint in-line instead.\n"); | |
1747 | } | |
1748 | ||
d35ae833 PA |
1749 | return -1; |
1750 | } | |
1751 | ||
237fc4c9 | 1752 | /* Save the original contents of the copy area. */ |
d20172fc SM |
1753 | displaced->step_saved_copy.resize (len); |
1754 | status = target_read_memory (copy, displaced->step_saved_copy.data (), len); | |
9e529e1d JK |
1755 | if (status != 0) |
1756 | throw_error (MEMORY_ERROR, | |
1757 | _("Error accessing memory address %s (%s) for " | |
1758 | "displaced-stepping scratch space."), | |
1759 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1760 | if (debug_displaced) |
1761 | { | |
5af949e3 UW |
1762 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1763 | paddress (gdbarch, copy)); | |
fc1cf338 | 1764 | displaced_step_dump_bytes (gdb_stdlog, |
d20172fc | 1765 | displaced->step_saved_copy.data (), |
fc1cf338 | 1766 | len); |
237fc4c9 PA |
1767 | }; |
1768 | ||
e8217e61 SM |
1769 | displaced->step_closure |
1770 | = gdbarch_displaced_step_copy_insn (gdbarch, original, copy, regcache); | |
1771 | if (displaced->step_closure == NULL) | |
7f03bd92 PA |
1772 | { |
1773 | /* The architecture doesn't know how or want to displaced step | |
1774 | this instruction or instruction sequence. Fallback to | |
1775 | stepping over the breakpoint in-line. */ | |
7f03bd92 PA |
1776 | return -1; |
1777 | } | |
237fc4c9 | 1778 | |
9f5a595d UW |
1779 | /* Save the information we need to fix things up if the step |
1780 | succeeds. */ | |
00431a78 | 1781 | displaced->step_thread = tp; |
fc1cf338 | 1782 | displaced->step_gdbarch = gdbarch; |
fc1cf338 PA |
1783 | displaced->step_original = original; |
1784 | displaced->step_copy = copy; | |
9f5a595d | 1785 | |
9799571e | 1786 | { |
d8d83535 | 1787 | displaced_step_reset_cleanup cleanup (displaced); |
237fc4c9 | 1788 | |
9799571e TT |
1789 | /* Resume execution at the copy. */ |
1790 | regcache_write_pc (regcache, copy); | |
237fc4c9 | 1791 | |
9799571e TT |
1792 | cleanup.release (); |
1793 | } | |
ad53cd71 | 1794 | |
237fc4c9 | 1795 | if (debug_displaced) |
5af949e3 UW |
1796 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1797 | paddress (gdbarch, copy)); | |
237fc4c9 | 1798 | |
237fc4c9 PA |
1799 | return 1; |
1800 | } | |
1801 | ||
3fc8eb30 PA |
1802 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1803 | attempts at displaced stepping if we get a memory error. */ | |
1804 | ||
1805 | static int | |
00431a78 | 1806 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 PA |
1807 | { |
1808 | int prepared = -1; | |
1809 | ||
a70b8144 | 1810 | try |
3fc8eb30 | 1811 | { |
00431a78 | 1812 | prepared = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1813 | } |
230d2906 | 1814 | catch (const gdb_exception_error &ex) |
3fc8eb30 PA |
1815 | { |
1816 | struct displaced_step_inferior_state *displaced_state; | |
1817 | ||
16b41842 PA |
1818 | if (ex.error != MEMORY_ERROR |
1819 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1820 | throw; |
3fc8eb30 PA |
1821 | |
1822 | if (debug_infrun) | |
1823 | { | |
1824 | fprintf_unfiltered (gdb_stdlog, | |
1825 | "infrun: disabling displaced stepping: %s\n", | |
3d6e9d23 | 1826 | ex.what ()); |
3fc8eb30 PA |
1827 | } |
1828 | ||
1829 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1830 | "auto". */ | |
1831 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1832 | { | |
fd7dcb94 | 1833 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1834 | ex.what ()); |
3fc8eb30 PA |
1835 | } |
1836 | ||
1837 | /* Disable further displaced stepping attempts. */ | |
1838 | displaced_state | |
00431a78 | 1839 | = get_displaced_stepping_state (thread->inf); |
3fc8eb30 PA |
1840 | displaced_state->failed_before = 1; |
1841 | } | |
3fc8eb30 PA |
1842 | |
1843 | return prepared; | |
1844 | } | |
1845 | ||
237fc4c9 | 1846 | static void |
3e43a32a MS |
1847 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1848 | const gdb_byte *myaddr, int len) | |
237fc4c9 | 1849 | { |
2989a365 | 1850 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
abbb1732 | 1851 | |
237fc4c9 PA |
1852 | inferior_ptid = ptid; |
1853 | write_memory (memaddr, myaddr, len); | |
237fc4c9 PA |
1854 | } |
1855 | ||
e2d96639 YQ |
1856 | /* Restore the contents of the copy area for thread PTID. */ |
1857 | ||
1858 | static void | |
1859 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1860 | ptid_t ptid) | |
1861 | { | |
1862 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1863 | ||
1864 | write_memory_ptid (ptid, displaced->step_copy, | |
d20172fc | 1865 | displaced->step_saved_copy.data (), len); |
e2d96639 YQ |
1866 | if (debug_displaced) |
1867 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
a068643d | 1868 | target_pid_to_str (ptid).c_str (), |
e2d96639 YQ |
1869 | paddress (displaced->step_gdbarch, |
1870 | displaced->step_copy)); | |
1871 | } | |
1872 | ||
372316f1 PA |
1873 | /* If we displaced stepped an instruction successfully, adjust |
1874 | registers and memory to yield the same effect the instruction would | |
1875 | have had if we had executed it at its original address, and return | |
1876 | 1. If the instruction didn't complete, relocate the PC and return | |
1877 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1878 | ||
1879 | static int | |
00431a78 | 1880 | displaced_step_fixup (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1881 | { |
fc1cf338 | 1882 | struct displaced_step_inferior_state *displaced |
00431a78 | 1883 | = get_displaced_stepping_state (event_thread->inf); |
372316f1 | 1884 | int ret; |
fc1cf338 | 1885 | |
00431a78 PA |
1886 | /* Was this event for the thread we displaced? */ |
1887 | if (displaced->step_thread != event_thread) | |
372316f1 | 1888 | return 0; |
237fc4c9 | 1889 | |
d8d83535 | 1890 | displaced_step_reset_cleanup cleanup (displaced); |
237fc4c9 | 1891 | |
00431a78 | 1892 | displaced_step_restore (displaced, displaced->step_thread->ptid); |
237fc4c9 | 1893 | |
cb71640d PA |
1894 | /* Fixup may need to read memory/registers. Switch to the thread |
1895 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
1896 | the current thread. */ | |
00431a78 | 1897 | switch_to_thread (event_thread); |
cb71640d | 1898 | |
237fc4c9 | 1899 | /* Did the instruction complete successfully? */ |
cb71640d PA |
1900 | if (signal == GDB_SIGNAL_TRAP |
1901 | && !(target_stopped_by_watchpoint () | |
1902 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
1903 | || target_have_steppable_watchpoint))) | |
237fc4c9 PA |
1904 | { |
1905 | /* Fix up the resulting state. */ | |
fc1cf338 | 1906 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
d8d83535 | 1907 | displaced->step_closure.get (), |
fc1cf338 PA |
1908 | displaced->step_original, |
1909 | displaced->step_copy, | |
00431a78 | 1910 | get_thread_regcache (displaced->step_thread)); |
372316f1 | 1911 | ret = 1; |
237fc4c9 PA |
1912 | } |
1913 | else | |
1914 | { | |
1915 | /* Since the instruction didn't complete, all we can do is | |
1916 | relocate the PC. */ | |
00431a78 | 1917 | struct regcache *regcache = get_thread_regcache (event_thread); |
515630c5 | 1918 | CORE_ADDR pc = regcache_read_pc (regcache); |
abbb1732 | 1919 | |
fc1cf338 | 1920 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1921 | regcache_write_pc (regcache, pc); |
372316f1 | 1922 | ret = -1; |
237fc4c9 PA |
1923 | } |
1924 | ||
372316f1 | 1925 | return ret; |
c2829269 | 1926 | } |
1c5cfe86 | 1927 | |
4d9d9d04 PA |
1928 | /* Data to be passed around while handling an event. This data is |
1929 | discarded between events. */ | |
1930 | struct execution_control_state | |
1931 | { | |
5b6d1e4f | 1932 | process_stratum_target *target; |
4d9d9d04 PA |
1933 | ptid_t ptid; |
1934 | /* The thread that got the event, if this was a thread event; NULL | |
1935 | otherwise. */ | |
1936 | struct thread_info *event_thread; | |
1937 | ||
1938 | struct target_waitstatus ws; | |
1939 | int stop_func_filled_in; | |
1940 | CORE_ADDR stop_func_start; | |
1941 | CORE_ADDR stop_func_end; | |
1942 | const char *stop_func_name; | |
1943 | int wait_some_more; | |
1944 | ||
1945 | /* True if the event thread hit the single-step breakpoint of | |
1946 | another thread. Thus the event doesn't cause a stop, the thread | |
1947 | needs to be single-stepped past the single-step breakpoint before | |
1948 | we can switch back to the original stepping thread. */ | |
1949 | int hit_singlestep_breakpoint; | |
1950 | }; | |
1951 | ||
1952 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1953 | |
1954 | static void | |
4d9d9d04 PA |
1955 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1956 | { | |
1957 | memset (ecs, 0, sizeof (*ecs)); | |
1958 | ecs->event_thread = tp; | |
1959 | ecs->ptid = tp->ptid; | |
1960 | } | |
1961 | ||
1962 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1963 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 1964 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1965 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1966 | |
1967 | /* Are there any pending step-over requests? If so, run all we can | |
1968 | now and return true. Otherwise, return false. */ | |
1969 | ||
1970 | static int | |
c2829269 PA |
1971 | start_step_over (void) |
1972 | { | |
1973 | struct thread_info *tp, *next; | |
1974 | ||
372316f1 PA |
1975 | /* Don't start a new step-over if we already have an in-line |
1976 | step-over operation ongoing. */ | |
1977 | if (step_over_info_valid_p ()) | |
1978 | return 0; | |
1979 | ||
c2829269 | 1980 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 1981 | { |
4d9d9d04 PA |
1982 | struct execution_control_state ecss; |
1983 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1984 | step_over_what step_what; |
372316f1 | 1985 | int must_be_in_line; |
c2829269 | 1986 | |
c65d6b55 PA |
1987 | gdb_assert (!tp->stop_requested); |
1988 | ||
c2829269 | 1989 | next = thread_step_over_chain_next (tp); |
237fc4c9 | 1990 | |
c2829269 PA |
1991 | /* If this inferior already has a displaced step in process, |
1992 | don't start a new one. */ | |
00431a78 | 1993 | if (displaced_step_in_progress (tp->inf)) |
c2829269 PA |
1994 | continue; |
1995 | ||
372316f1 PA |
1996 | step_what = thread_still_needs_step_over (tp); |
1997 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1998 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1999 | && !use_displaced_stepping (tp))); |
372316f1 PA |
2000 | |
2001 | /* We currently stop all threads of all processes to step-over | |
2002 | in-line. If we need to start a new in-line step-over, let | |
2003 | any pending displaced steps finish first. */ | |
2004 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
2005 | return 0; | |
2006 | ||
c2829269 PA |
2007 | thread_step_over_chain_remove (tp); |
2008 | ||
2009 | if (step_over_queue_head == NULL) | |
2010 | { | |
2011 | if (debug_infrun) | |
2012 | fprintf_unfiltered (gdb_stdlog, | |
2013 | "infrun: step-over queue now empty\n"); | |
2014 | } | |
2015 | ||
372316f1 PA |
2016 | if (tp->control.trap_expected |
2017 | || tp->resumed | |
2018 | || tp->executing) | |
ad53cd71 | 2019 | { |
4d9d9d04 PA |
2020 | internal_error (__FILE__, __LINE__, |
2021 | "[%s] has inconsistent state: " | |
372316f1 | 2022 | "trap_expected=%d, resumed=%d, executing=%d\n", |
a068643d | 2023 | target_pid_to_str (tp->ptid).c_str (), |
4d9d9d04 | 2024 | tp->control.trap_expected, |
372316f1 | 2025 | tp->resumed, |
4d9d9d04 | 2026 | tp->executing); |
ad53cd71 | 2027 | } |
1c5cfe86 | 2028 | |
4d9d9d04 PA |
2029 | if (debug_infrun) |
2030 | fprintf_unfiltered (gdb_stdlog, | |
2031 | "infrun: resuming [%s] for step-over\n", | |
a068643d | 2032 | target_pid_to_str (tp->ptid).c_str ()); |
4d9d9d04 PA |
2033 | |
2034 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2035 | is no longer inserted. In all-stop, we want to keep looking | |
2036 | for a thread that needs a step-over instead of resuming TP, | |
2037 | because we wouldn't be able to resume anything else until the | |
2038 | target stops again. In non-stop, the resume always resumes | |
2039 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2040 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2041 | continue; |
8550d3b3 | 2042 | |
00431a78 | 2043 | switch_to_thread (tp); |
4d9d9d04 PA |
2044 | reset_ecs (ecs, tp); |
2045 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2046 | |
4d9d9d04 PA |
2047 | if (!ecs->wait_some_more) |
2048 | error (_("Command aborted.")); | |
1c5cfe86 | 2049 | |
372316f1 PA |
2050 | gdb_assert (tp->resumed); |
2051 | ||
2052 | /* If we started a new in-line step-over, we're done. */ | |
2053 | if (step_over_info_valid_p ()) | |
2054 | { | |
2055 | gdb_assert (tp->control.trap_expected); | |
2056 | return 1; | |
2057 | } | |
2058 | ||
fbea99ea | 2059 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2060 | { |
2061 | /* On all-stop, shouldn't have resumed unless we needed a | |
2062 | step over. */ | |
2063 | gdb_assert (tp->control.trap_expected | |
2064 | || tp->step_after_step_resume_breakpoint); | |
2065 | ||
2066 | /* With remote targets (at least), in all-stop, we can't | |
2067 | issue any further remote commands until the program stops | |
2068 | again. */ | |
2069 | return 1; | |
1c5cfe86 | 2070 | } |
c2829269 | 2071 | |
4d9d9d04 PA |
2072 | /* Either the thread no longer needed a step-over, or a new |
2073 | displaced stepping sequence started. Even in the latter | |
2074 | case, continue looking. Maybe we can also start another | |
2075 | displaced step on a thread of other process. */ | |
237fc4c9 | 2076 | } |
4d9d9d04 PA |
2077 | |
2078 | return 0; | |
237fc4c9 PA |
2079 | } |
2080 | ||
5231c1fd PA |
2081 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2082 | holding OLD_PTID. */ | |
2083 | static void | |
2084 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2085 | { | |
d7e15655 | 2086 | if (inferior_ptid == old_ptid) |
5231c1fd | 2087 | inferior_ptid = new_ptid; |
5231c1fd PA |
2088 | } |
2089 | ||
237fc4c9 | 2090 | \f |
c906108c | 2091 | |
53904c9e AC |
2092 | static const char schedlock_off[] = "off"; |
2093 | static const char schedlock_on[] = "on"; | |
2094 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2095 | static const char schedlock_replay[] = "replay"; |
40478521 | 2096 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2097 | schedlock_off, |
2098 | schedlock_on, | |
2099 | schedlock_step, | |
f2665db5 | 2100 | schedlock_replay, |
ef346e04 AC |
2101 | NULL |
2102 | }; | |
f2665db5 | 2103 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2104 | static void |
2105 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2106 | struct cmd_list_element *c, const char *value) | |
2107 | { | |
3e43a32a MS |
2108 | fprintf_filtered (file, |
2109 | _("Mode for locking scheduler " | |
2110 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2111 | value); |
2112 | } | |
c906108c SS |
2113 | |
2114 | static void | |
eb4c3f4a | 2115 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2116 | { |
eefe576e AC |
2117 | if (!target_can_lock_scheduler) |
2118 | { | |
2119 | scheduler_mode = schedlock_off; | |
2120 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2121 | } | |
c906108c SS |
2122 | } |
2123 | ||
d4db2f36 PA |
2124 | /* True if execution commands resume all threads of all processes by |
2125 | default; otherwise, resume only threads of the current inferior | |
2126 | process. */ | |
491144b5 | 2127 | bool sched_multi = false; |
d4db2f36 | 2128 | |
2facfe5c DD |
2129 | /* Try to setup for software single stepping over the specified location. |
2130 | Return 1 if target_resume() should use hardware single step. | |
2131 | ||
2132 | GDBARCH the current gdbarch. | |
2133 | PC the location to step over. */ | |
2134 | ||
2135 | static int | |
2136 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2137 | { | |
2138 | int hw_step = 1; | |
2139 | ||
f02253f1 | 2140 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2141 | && gdbarch_software_single_step_p (gdbarch)) |
2142 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2143 | ||
2facfe5c DD |
2144 | return hw_step; |
2145 | } | |
c906108c | 2146 | |
f3263aa4 PA |
2147 | /* See infrun.h. */ |
2148 | ||
09cee04b PA |
2149 | ptid_t |
2150 | user_visible_resume_ptid (int step) | |
2151 | { | |
f3263aa4 | 2152 | ptid_t resume_ptid; |
09cee04b | 2153 | |
09cee04b PA |
2154 | if (non_stop) |
2155 | { | |
2156 | /* With non-stop mode on, threads are always handled | |
2157 | individually. */ | |
2158 | resume_ptid = inferior_ptid; | |
2159 | } | |
2160 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2161 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2162 | { |
f3263aa4 PA |
2163 | /* User-settable 'scheduler' mode requires solo thread |
2164 | resume. */ | |
09cee04b PA |
2165 | resume_ptid = inferior_ptid; |
2166 | } | |
f2665db5 MM |
2167 | else if ((scheduler_mode == schedlock_replay) |
2168 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2169 | { | |
2170 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2171 | mode. */ | |
2172 | resume_ptid = inferior_ptid; | |
2173 | } | |
f3263aa4 PA |
2174 | else if (!sched_multi && target_supports_multi_process ()) |
2175 | { | |
2176 | /* Resume all threads of the current process (and none of other | |
2177 | processes). */ | |
e99b03dc | 2178 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2179 | } |
2180 | else | |
2181 | { | |
2182 | /* Resume all threads of all processes. */ | |
2183 | resume_ptid = RESUME_ALL; | |
2184 | } | |
09cee04b PA |
2185 | |
2186 | return resume_ptid; | |
2187 | } | |
2188 | ||
5b6d1e4f PA |
2189 | /* See infrun.h. */ |
2190 | ||
2191 | process_stratum_target * | |
2192 | user_visible_resume_target (ptid_t resume_ptid) | |
2193 | { | |
2194 | return (resume_ptid == minus_one_ptid && sched_multi | |
2195 | ? NULL | |
2196 | : current_inferior ()->process_target ()); | |
2197 | } | |
2198 | ||
fbea99ea PA |
2199 | /* Return a ptid representing the set of threads that we will resume, |
2200 | in the perspective of the target, assuming run control handling | |
2201 | does not require leaving some threads stopped (e.g., stepping past | |
2202 | breakpoint). USER_STEP indicates whether we're about to start the | |
2203 | target for a stepping command. */ | |
2204 | ||
2205 | static ptid_t | |
2206 | internal_resume_ptid (int user_step) | |
2207 | { | |
2208 | /* In non-stop, we always control threads individually. Note that | |
2209 | the target may always work in non-stop mode even with "set | |
2210 | non-stop off", in which case user_visible_resume_ptid could | |
2211 | return a wildcard ptid. */ | |
2212 | if (target_is_non_stop_p ()) | |
2213 | return inferior_ptid; | |
2214 | else | |
2215 | return user_visible_resume_ptid (user_step); | |
2216 | } | |
2217 | ||
64ce06e4 PA |
2218 | /* Wrapper for target_resume, that handles infrun-specific |
2219 | bookkeeping. */ | |
2220 | ||
2221 | static void | |
2222 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2223 | { | |
2224 | struct thread_info *tp = inferior_thread (); | |
2225 | ||
c65d6b55 PA |
2226 | gdb_assert (!tp->stop_requested); |
2227 | ||
64ce06e4 | 2228 | /* Install inferior's terminal modes. */ |
223ffa71 | 2229 | target_terminal::inferior (); |
64ce06e4 PA |
2230 | |
2231 | /* Avoid confusing the next resume, if the next stop/resume | |
2232 | happens to apply to another thread. */ | |
2233 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2234 | ||
8f572e5c PA |
2235 | /* Advise target which signals may be handled silently. |
2236 | ||
2237 | If we have removed breakpoints because we are stepping over one | |
2238 | in-line (in any thread), we need to receive all signals to avoid | |
2239 | accidentally skipping a breakpoint during execution of a signal | |
2240 | handler. | |
2241 | ||
2242 | Likewise if we're displaced stepping, otherwise a trap for a | |
2243 | breakpoint in a signal handler might be confused with the | |
2244 | displaced step finishing. We don't make the displaced_step_fixup | |
2245 | step distinguish the cases instead, because: | |
2246 | ||
2247 | - a backtrace while stopped in the signal handler would show the | |
2248 | scratch pad as frame older than the signal handler, instead of | |
2249 | the real mainline code. | |
2250 | ||
2251 | - when the thread is later resumed, the signal handler would | |
2252 | return to the scratch pad area, which would no longer be | |
2253 | valid. */ | |
2254 | if (step_over_info_valid_p () | |
00431a78 | 2255 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2256 | target_pass_signals ({}); |
64ce06e4 | 2257 | else |
adc6a863 | 2258 | target_pass_signals (signal_pass); |
64ce06e4 PA |
2259 | |
2260 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2261 | |
2262 | target_commit_resume (); | |
5b6d1e4f PA |
2263 | |
2264 | if (target_can_async_p ()) | |
2265 | target_async (1); | |
64ce06e4 PA |
2266 | } |
2267 | ||
d930703d | 2268 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2269 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2270 | call 'resume', which handles exceptions. */ | |
c906108c | 2271 | |
71d378ae PA |
2272 | static void |
2273 | resume_1 (enum gdb_signal sig) | |
c906108c | 2274 | { |
515630c5 | 2275 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2276 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2277 | struct thread_info *tp = inferior_thread (); |
515630c5 | 2278 | CORE_ADDR pc = regcache_read_pc (regcache); |
8b86c959 | 2279 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2280 | ptid_t resume_ptid; |
856e7dd6 PA |
2281 | /* This represents the user's step vs continue request. When |
2282 | deciding whether "set scheduler-locking step" applies, it's the | |
2283 | user's intention that counts. */ | |
2284 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2285 | /* This represents what we'll actually request the target to do. |
2286 | This can decay from a step to a continue, if e.g., we need to | |
2287 | implement single-stepping with breakpoints (software | |
2288 | single-step). */ | |
6b403daa | 2289 | int step; |
c7e8a53c | 2290 | |
c65d6b55 | 2291 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2292 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2293 | ||
372316f1 PA |
2294 | if (tp->suspend.waitstatus_pending_p) |
2295 | { | |
2296 | if (debug_infrun) | |
2297 | { | |
23fdd69e SM |
2298 | std::string statstr |
2299 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2300 | |
372316f1 | 2301 | fprintf_unfiltered (gdb_stdlog, |
23fdd69e SM |
2302 | "infrun: resume: thread %s has pending wait " |
2303 | "status %s (currently_stepping=%d).\n", | |
a068643d TT |
2304 | target_pid_to_str (tp->ptid).c_str (), |
2305 | statstr.c_str (), | |
372316f1 | 2306 | currently_stepping (tp)); |
372316f1 PA |
2307 | } |
2308 | ||
5b6d1e4f | 2309 | tp->inf->process_target ()->threads_executing = true; |
719546c4 | 2310 | tp->resumed = true; |
372316f1 PA |
2311 | |
2312 | /* FIXME: What should we do if we are supposed to resume this | |
2313 | thread with a signal? Maybe we should maintain a queue of | |
2314 | pending signals to deliver. */ | |
2315 | if (sig != GDB_SIGNAL_0) | |
2316 | { | |
fd7dcb94 | 2317 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d TT |
2318 | gdb_signal_to_name (sig), |
2319 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2320 | } |
2321 | ||
2322 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2323 | |
2324 | if (target_can_async_p ()) | |
9516f85a AB |
2325 | { |
2326 | target_async (1); | |
2327 | /* Tell the event loop we have an event to process. */ | |
2328 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2329 | } | |
372316f1 PA |
2330 | return; |
2331 | } | |
2332 | ||
2333 | tp->stepped_breakpoint = 0; | |
2334 | ||
6b403daa PA |
2335 | /* Depends on stepped_breakpoint. */ |
2336 | step = currently_stepping (tp); | |
2337 | ||
74609e71 YQ |
2338 | if (current_inferior ()->waiting_for_vfork_done) |
2339 | { | |
48f9886d PA |
2340 | /* Don't try to single-step a vfork parent that is waiting for |
2341 | the child to get out of the shared memory region (by exec'ing | |
2342 | or exiting). This is particularly important on software | |
2343 | single-step archs, as the child process would trip on the | |
2344 | software single step breakpoint inserted for the parent | |
2345 | process. Since the parent will not actually execute any | |
2346 | instruction until the child is out of the shared region (such | |
2347 | are vfork's semantics), it is safe to simply continue it. | |
2348 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2349 | the parent, and tell it to `keep_going', which automatically | |
2350 | re-sets it stepping. */ | |
74609e71 YQ |
2351 | if (debug_infrun) |
2352 | fprintf_unfiltered (gdb_stdlog, | |
2353 | "infrun: resume : clear step\n"); | |
a09dd441 | 2354 | step = 0; |
74609e71 YQ |
2355 | } |
2356 | ||
527159b7 | 2357 | if (debug_infrun) |
237fc4c9 | 2358 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 2359 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 2360 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
2361 | step, gdb_signal_to_symbol_string (sig), |
2362 | tp->control.trap_expected, | |
a068643d | 2363 | target_pid_to_str (inferior_ptid).c_str (), |
0d9a9a5f | 2364 | paddress (gdbarch, pc)); |
c906108c | 2365 | |
c2c6d25f JM |
2366 | /* Normally, by the time we reach `resume', the breakpoints are either |
2367 | removed or inserted, as appropriate. The exception is if we're sitting | |
2368 | at a permanent breakpoint; we need to step over it, but permanent | |
2369 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2370 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2371 | { |
af48d08f PA |
2372 | if (sig != GDB_SIGNAL_0) |
2373 | { | |
2374 | /* We have a signal to pass to the inferior. The resume | |
2375 | may, or may not take us to the signal handler. If this | |
2376 | is a step, we'll need to stop in the signal handler, if | |
2377 | there's one, (if the target supports stepping into | |
2378 | handlers), or in the next mainline instruction, if | |
2379 | there's no handler. If this is a continue, we need to be | |
2380 | sure to run the handler with all breakpoints inserted. | |
2381 | In all cases, set a breakpoint at the current address | |
2382 | (where the handler returns to), and once that breakpoint | |
2383 | is hit, resume skipping the permanent breakpoint. If | |
2384 | that breakpoint isn't hit, then we've stepped into the | |
2385 | signal handler (or hit some other event). We'll delete | |
2386 | the step-resume breakpoint then. */ | |
2387 | ||
2388 | if (debug_infrun) | |
2389 | fprintf_unfiltered (gdb_stdlog, | |
2390 | "infrun: resume: skipping permanent breakpoint, " | |
2391 | "deliver signal first\n"); | |
2392 | ||
2393 | clear_step_over_info (); | |
2394 | tp->control.trap_expected = 0; | |
2395 | ||
2396 | if (tp->control.step_resume_breakpoint == NULL) | |
2397 | { | |
2398 | /* Set a "high-priority" step-resume, as we don't want | |
2399 | user breakpoints at PC to trigger (again) when this | |
2400 | hits. */ | |
2401 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2402 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2403 | ||
2404 | tp->step_after_step_resume_breakpoint = step; | |
2405 | } | |
2406 | ||
2407 | insert_breakpoints (); | |
2408 | } | |
2409 | else | |
2410 | { | |
2411 | /* There's no signal to pass, we can go ahead and skip the | |
2412 | permanent breakpoint manually. */ | |
2413 | if (debug_infrun) | |
2414 | fprintf_unfiltered (gdb_stdlog, | |
2415 | "infrun: resume: skipping permanent breakpoint\n"); | |
2416 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
2417 | /* Update pc to reflect the new address from which we will | |
2418 | execute instructions. */ | |
2419 | pc = regcache_read_pc (regcache); | |
2420 | ||
2421 | if (step) | |
2422 | { | |
2423 | /* We've already advanced the PC, so the stepping part | |
2424 | is done. Now we need to arrange for a trap to be | |
2425 | reported to handle_inferior_event. Set a breakpoint | |
2426 | at the current PC, and run to it. Don't update | |
2427 | prev_pc, because if we end in | |
44a1ee51 PA |
2428 | switch_back_to_stepped_thread, we want the "expected |
2429 | thread advanced also" branch to be taken. IOW, we | |
2430 | don't want this thread to step further from PC | |
af48d08f | 2431 | (overstep). */ |
1ac806b8 | 2432 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2433 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2434 | insert_breakpoints (); | |
2435 | ||
fbea99ea | 2436 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2437 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
719546c4 | 2438 | tp->resumed = true; |
af48d08f PA |
2439 | return; |
2440 | } | |
2441 | } | |
6d350bb5 | 2442 | } |
c2c6d25f | 2443 | |
c1e36e3e PA |
2444 | /* If we have a breakpoint to step over, make sure to do a single |
2445 | step only. Same if we have software watchpoints. */ | |
2446 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2447 | tp->control.may_range_step = 0; | |
2448 | ||
7da6a5b9 LM |
2449 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2450 | copy of the instruction at a different address. | |
237fc4c9 PA |
2451 | |
2452 | We can't use displaced stepping when we have a signal to deliver; | |
2453 | the comments for displaced_step_prepare explain why. The | |
2454 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2455 | signals' explain what we do instead. |
2456 | ||
2457 | We can't use displaced stepping when we are waiting for vfork_done | |
2458 | event, displaced stepping breaks the vfork child similarly as single | |
2459 | step software breakpoint. */ | |
3fc8eb30 PA |
2460 | if (tp->control.trap_expected |
2461 | && use_displaced_stepping (tp) | |
cb71640d | 2462 | && !step_over_info_valid_p () |
a493e3e2 | 2463 | && sig == GDB_SIGNAL_0 |
74609e71 | 2464 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2465 | { |
00431a78 | 2466 | int prepared = displaced_step_prepare (tp); |
fc1cf338 | 2467 | |
3fc8eb30 | 2468 | if (prepared == 0) |
d56b7306 | 2469 | { |
4d9d9d04 PA |
2470 | if (debug_infrun) |
2471 | fprintf_unfiltered (gdb_stdlog, | |
2472 | "Got placed in step-over queue\n"); | |
2473 | ||
2474 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2475 | return; |
2476 | } | |
3fc8eb30 PA |
2477 | else if (prepared < 0) |
2478 | { | |
2479 | /* Fallback to stepping over the breakpoint in-line. */ | |
2480 | ||
2481 | if (target_is_non_stop_p ()) | |
2482 | stop_all_threads (); | |
2483 | ||
a01bda52 | 2484 | set_step_over_info (regcache->aspace (), |
21edc42f | 2485 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2486 | |
2487 | step = maybe_software_singlestep (gdbarch, pc); | |
2488 | ||
2489 | insert_breakpoints (); | |
2490 | } | |
2491 | else if (prepared > 0) | |
2492 | { | |
2493 | struct displaced_step_inferior_state *displaced; | |
99e40580 | 2494 | |
3fc8eb30 PA |
2495 | /* Update pc to reflect the new address from which we will |
2496 | execute instructions due to displaced stepping. */ | |
00431a78 | 2497 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2498 | |
00431a78 | 2499 | displaced = get_displaced_stepping_state (tp->inf); |
d8d83535 SM |
2500 | step = gdbarch_displaced_step_hw_singlestep |
2501 | (gdbarch, displaced->step_closure.get ()); | |
3fc8eb30 | 2502 | } |
237fc4c9 PA |
2503 | } |
2504 | ||
2facfe5c | 2505 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2506 | else if (step) |
2facfe5c | 2507 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2508 | |
30852783 UW |
2509 | /* Currently, our software single-step implementation leads to different |
2510 | results than hardware single-stepping in one situation: when stepping | |
2511 | into delivering a signal which has an associated signal handler, | |
2512 | hardware single-step will stop at the first instruction of the handler, | |
2513 | while software single-step will simply skip execution of the handler. | |
2514 | ||
2515 | For now, this difference in behavior is accepted since there is no | |
2516 | easy way to actually implement single-stepping into a signal handler | |
2517 | without kernel support. | |
2518 | ||
2519 | However, there is one scenario where this difference leads to follow-on | |
2520 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2521 | and then single-stepping. In this case, the software single-step | |
2522 | behavior means that even if there is a *breakpoint* in the signal | |
2523 | handler, GDB still would not stop. | |
2524 | ||
2525 | Fortunately, we can at least fix this particular issue. We detect | |
2526 | here the case where we are about to deliver a signal while software | |
2527 | single-stepping with breakpoints removed. In this situation, we | |
2528 | revert the decisions to remove all breakpoints and insert single- | |
2529 | step breakpoints, and instead we install a step-resume breakpoint | |
2530 | at the current address, deliver the signal without stepping, and | |
2531 | once we arrive back at the step-resume breakpoint, actually step | |
2532 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2533 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2534 | && sig != GDB_SIGNAL_0 |
2535 | && step_over_info_valid_p ()) | |
30852783 UW |
2536 | { |
2537 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2538 | immediately after a handler returns, might already have |
30852783 UW |
2539 | a step-resume breakpoint set on the earlier handler. We cannot |
2540 | set another step-resume breakpoint; just continue on until the | |
2541 | original breakpoint is hit. */ | |
2542 | if (tp->control.step_resume_breakpoint == NULL) | |
2543 | { | |
2c03e5be | 2544 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2545 | tp->step_after_step_resume_breakpoint = 1; |
2546 | } | |
2547 | ||
34b7e8a6 | 2548 | delete_single_step_breakpoints (tp); |
30852783 | 2549 | |
31e77af2 | 2550 | clear_step_over_info (); |
30852783 | 2551 | tp->control.trap_expected = 0; |
31e77af2 PA |
2552 | |
2553 | insert_breakpoints (); | |
30852783 UW |
2554 | } |
2555 | ||
b0f16a3e SM |
2556 | /* If STEP is set, it's a request to use hardware stepping |
2557 | facilities. But in that case, we should never | |
2558 | use singlestep breakpoint. */ | |
34b7e8a6 | 2559 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2560 | |
fbea99ea | 2561 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2562 | if (tp->control.trap_expected) |
b0f16a3e SM |
2563 | { |
2564 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2565 | hit, either by single-stepping the thread with the breakpoint |
2566 | removed, or by displaced stepping, with the breakpoint inserted. | |
2567 | In the former case, we need to single-step only this thread, | |
2568 | and keep others stopped, as they can miss this breakpoint if | |
2569 | allowed to run. That's not really a problem for displaced | |
2570 | stepping, but, we still keep other threads stopped, in case | |
2571 | another thread is also stopped for a breakpoint waiting for | |
2572 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2573 | resume_ptid = inferior_ptid; |
2574 | } | |
fbea99ea PA |
2575 | else |
2576 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2577 | |
7f5ef605 PA |
2578 | if (execution_direction != EXEC_REVERSE |
2579 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2580 | { |
372316f1 PA |
2581 | /* There are two cases where we currently need to step a |
2582 | breakpoint instruction when we have a signal to deliver: | |
2583 | ||
2584 | - See handle_signal_stop where we handle random signals that | |
2585 | could take out us out of the stepping range. Normally, in | |
2586 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2587 | signal handler with a breakpoint at PC, but there are cases |
2588 | where we should _always_ single-step, even if we have a | |
2589 | step-resume breakpoint, like when a software watchpoint is | |
2590 | set. Assuming single-stepping and delivering a signal at the | |
2591 | same time would takes us to the signal handler, then we could | |
2592 | have removed the breakpoint at PC to step over it. However, | |
2593 | some hardware step targets (like e.g., Mac OS) can't step | |
2594 | into signal handlers, and for those, we need to leave the | |
2595 | breakpoint at PC inserted, as otherwise if the handler | |
2596 | recurses and executes PC again, it'll miss the breakpoint. | |
2597 | So we leave the breakpoint inserted anyway, but we need to | |
2598 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2599 | that adjust_pc_after_break doesn't end up confused. |
2600 | ||
2601 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2602 | in one thread after another thread that was stepping had been | |
2603 | momentarily paused for a step-over. When we re-resume the | |
2604 | stepping thread, it may be resumed from that address with a | |
2605 | breakpoint that hasn't trapped yet. Seen with | |
2606 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2607 | do displaced stepping. */ | |
2608 | ||
2609 | if (debug_infrun) | |
2610 | fprintf_unfiltered (gdb_stdlog, | |
2611 | "infrun: resume: [%s] stepped breakpoint\n", | |
a068643d | 2612 | target_pid_to_str (tp->ptid).c_str ()); |
7f5ef605 PA |
2613 | |
2614 | tp->stepped_breakpoint = 1; | |
2615 | ||
b0f16a3e SM |
2616 | /* Most targets can step a breakpoint instruction, thus |
2617 | executing it normally. But if this one cannot, just | |
2618 | continue and we will hit it anyway. */ | |
7f5ef605 | 2619 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2620 | step = 0; |
2621 | } | |
ef5cf84e | 2622 | |
b0f16a3e | 2623 | if (debug_displaced |
cb71640d | 2624 | && tp->control.trap_expected |
3fc8eb30 | 2625 | && use_displaced_stepping (tp) |
cb71640d | 2626 | && !step_over_info_valid_p ()) |
b0f16a3e | 2627 | { |
00431a78 | 2628 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2629 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2630 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2631 | gdb_byte buf[4]; | |
2632 | ||
2633 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2634 | paddress (resume_gdbarch, actual_pc)); | |
2635 | read_memory (actual_pc, buf, sizeof (buf)); | |
2636 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2637 | } | |
237fc4c9 | 2638 | |
b0f16a3e SM |
2639 | if (tp->control.may_range_step) |
2640 | { | |
2641 | /* If we're resuming a thread with the PC out of the step | |
2642 | range, then we're doing some nested/finer run control | |
2643 | operation, like stepping the thread out of the dynamic | |
2644 | linker or the displaced stepping scratch pad. We | |
2645 | shouldn't have allowed a range step then. */ | |
2646 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2647 | } | |
c1e36e3e | 2648 | |
64ce06e4 | 2649 | do_target_resume (resume_ptid, step, sig); |
719546c4 | 2650 | tp->resumed = true; |
c906108c | 2651 | } |
71d378ae PA |
2652 | |
2653 | /* Resume the inferior. SIG is the signal to give the inferior | |
2654 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2655 | rolls back state on error. */ | |
2656 | ||
aff4e175 | 2657 | static void |
71d378ae PA |
2658 | resume (gdb_signal sig) |
2659 | { | |
a70b8144 | 2660 | try |
71d378ae PA |
2661 | { |
2662 | resume_1 (sig); | |
2663 | } | |
230d2906 | 2664 | catch (const gdb_exception &ex) |
71d378ae PA |
2665 | { |
2666 | /* If resuming is being aborted for any reason, delete any | |
2667 | single-step breakpoint resume_1 may have created, to avoid | |
2668 | confusing the following resumption, and to avoid leaving | |
2669 | single-step breakpoints perturbing other threads, in case | |
2670 | we're running in non-stop mode. */ | |
2671 | if (inferior_ptid != null_ptid) | |
2672 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2673 | throw; |
71d378ae | 2674 | } |
71d378ae PA |
2675 | } |
2676 | ||
c906108c | 2677 | \f |
237fc4c9 | 2678 | /* Proceeding. */ |
c906108c | 2679 | |
4c2f2a79 PA |
2680 | /* See infrun.h. */ |
2681 | ||
2682 | /* Counter that tracks number of user visible stops. This can be used | |
2683 | to tell whether a command has proceeded the inferior past the | |
2684 | current location. This allows e.g., inferior function calls in | |
2685 | breakpoint commands to not interrupt the command list. When the | |
2686 | call finishes successfully, the inferior is standing at the same | |
2687 | breakpoint as if nothing happened (and so we don't call | |
2688 | normal_stop). */ | |
2689 | static ULONGEST current_stop_id; | |
2690 | ||
2691 | /* See infrun.h. */ | |
2692 | ||
2693 | ULONGEST | |
2694 | get_stop_id (void) | |
2695 | { | |
2696 | return current_stop_id; | |
2697 | } | |
2698 | ||
2699 | /* Called when we report a user visible stop. */ | |
2700 | ||
2701 | static void | |
2702 | new_stop_id (void) | |
2703 | { | |
2704 | current_stop_id++; | |
2705 | } | |
2706 | ||
c906108c SS |
2707 | /* Clear out all variables saying what to do when inferior is continued. |
2708 | First do this, then set the ones you want, then call `proceed'. */ | |
2709 | ||
a7212384 UW |
2710 | static void |
2711 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2712 | { |
a7212384 UW |
2713 | if (debug_infrun) |
2714 | fprintf_unfiltered (gdb_stdlog, | |
2715 | "infrun: clear_proceed_status_thread (%s)\n", | |
a068643d | 2716 | target_pid_to_str (tp->ptid).c_str ()); |
d6b48e9c | 2717 | |
372316f1 PA |
2718 | /* If we're starting a new sequence, then the previous finished |
2719 | single-step is no longer relevant. */ | |
2720 | if (tp->suspend.waitstatus_pending_p) | |
2721 | { | |
2722 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2723 | { | |
2724 | if (debug_infrun) | |
2725 | fprintf_unfiltered (gdb_stdlog, | |
2726 | "infrun: clear_proceed_status: pending " | |
2727 | "event of %s was a finished step. " | |
2728 | "Discarding.\n", | |
a068643d | 2729 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
2730 | |
2731 | tp->suspend.waitstatus_pending_p = 0; | |
2732 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2733 | } | |
2734 | else if (debug_infrun) | |
2735 | { | |
23fdd69e SM |
2736 | std::string statstr |
2737 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2738 | |
372316f1 PA |
2739 | fprintf_unfiltered (gdb_stdlog, |
2740 | "infrun: clear_proceed_status_thread: thread %s " | |
2741 | "has pending wait status %s " | |
2742 | "(currently_stepping=%d).\n", | |
a068643d TT |
2743 | target_pid_to_str (tp->ptid).c_str (), |
2744 | statstr.c_str (), | |
372316f1 | 2745 | currently_stepping (tp)); |
372316f1 PA |
2746 | } |
2747 | } | |
2748 | ||
70509625 PA |
2749 | /* If this signal should not be seen by program, give it zero. |
2750 | Used for debugging signals. */ | |
2751 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2752 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2753 | ||
46e3ed7f | 2754 | delete tp->thread_fsm; |
243a9253 PA |
2755 | tp->thread_fsm = NULL; |
2756 | ||
16c381f0 JK |
2757 | tp->control.trap_expected = 0; |
2758 | tp->control.step_range_start = 0; | |
2759 | tp->control.step_range_end = 0; | |
c1e36e3e | 2760 | tp->control.may_range_step = 0; |
16c381f0 JK |
2761 | tp->control.step_frame_id = null_frame_id; |
2762 | tp->control.step_stack_frame_id = null_frame_id; | |
2763 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2764 | tp->control.step_start_function = NULL; |
a7212384 | 2765 | tp->stop_requested = 0; |
4e1c45ea | 2766 | |
16c381f0 | 2767 | tp->control.stop_step = 0; |
32400beb | 2768 | |
16c381f0 | 2769 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2770 | |
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 | { |
f2665db5 MM |
2780 | /* With scheduler-locking replay, stop replaying other threads if we're |
2781 | not replaying the user-visible resume ptid. | |
2782 | ||
2783 | This is a convenience feature to not require the user to explicitly | |
2784 | stop replaying the other threads. We're assuming that the user's | |
2785 | intent is to resume tracing the recorded process. */ | |
2786 | if (!non_stop && scheduler_mode == schedlock_replay | |
2787 | && target_record_is_replaying (minus_one_ptid) | |
2788 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2789 | execution_direction)) | |
2790 | target_record_stop_replaying (); | |
2791 | ||
08036331 | 2792 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2793 | { |
08036331 | 2794 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2795 | process_stratum_target *resume_target |
2796 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2797 | |
2798 | /* In all-stop mode, delete the per-thread status of all threads | |
2799 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2800 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2801 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2802 | } |
2803 | ||
d7e15655 | 2804 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2805 | { |
2806 | struct inferior *inferior; | |
2807 | ||
2808 | if (non_stop) | |
2809 | { | |
6c95b8df PA |
2810 | /* If in non-stop mode, only delete the per-thread status of |
2811 | the current thread. */ | |
a7212384 UW |
2812 | clear_proceed_status_thread (inferior_thread ()); |
2813 | } | |
6c95b8df | 2814 | |
d6b48e9c | 2815 | inferior = current_inferior (); |
16c381f0 | 2816 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2817 | } |
2818 | ||
76727919 | 2819 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2820 | } |
2821 | ||
99619bea PA |
2822 | /* Returns true if TP is still stopped at a breakpoint that needs |
2823 | stepping-over in order to make progress. If the breakpoint is gone | |
2824 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2825 | |
2826 | static int | |
6c4cfb24 | 2827 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2828 | { |
2829 | if (tp->stepping_over_breakpoint) | |
2830 | { | |
00431a78 | 2831 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2832 | |
a01bda52 | 2833 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2834 | regcache_read_pc (regcache)) |
2835 | == ordinary_breakpoint_here) | |
99619bea PA |
2836 | return 1; |
2837 | ||
2838 | tp->stepping_over_breakpoint = 0; | |
2839 | } | |
2840 | ||
2841 | return 0; | |
2842 | } | |
2843 | ||
6c4cfb24 PA |
2844 | /* Check whether thread TP still needs to start a step-over in order |
2845 | to make progress when resumed. Returns an bitwise or of enum | |
2846 | step_over_what bits, indicating what needs to be stepped over. */ | |
2847 | ||
8d297bbf | 2848 | static step_over_what |
6c4cfb24 PA |
2849 | thread_still_needs_step_over (struct thread_info *tp) |
2850 | { | |
8d297bbf | 2851 | step_over_what what = 0; |
6c4cfb24 PA |
2852 | |
2853 | if (thread_still_needs_step_over_bp (tp)) | |
2854 | what |= STEP_OVER_BREAKPOINT; | |
2855 | ||
2856 | if (tp->stepping_over_watchpoint | |
2857 | && !target_have_steppable_watchpoint) | |
2858 | what |= STEP_OVER_WATCHPOINT; | |
2859 | ||
2860 | return what; | |
2861 | } | |
2862 | ||
483805cf PA |
2863 | /* Returns true if scheduler locking applies. STEP indicates whether |
2864 | we're about to do a step/next-like command to a thread. */ | |
2865 | ||
2866 | static int | |
856e7dd6 | 2867 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2868 | { |
2869 | return (scheduler_mode == schedlock_on | |
2870 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2871 | && tp->control.stepping_command) |
2872 | || (scheduler_mode == schedlock_replay | |
2873 | && target_record_will_replay (minus_one_ptid, | |
2874 | execution_direction))); | |
483805cf PA |
2875 | } |
2876 | ||
5b6d1e4f PA |
2877 | /* Calls target_commit_resume on all targets. */ |
2878 | ||
2879 | static void | |
2880 | commit_resume_all_targets () | |
2881 | { | |
2882 | scoped_restore_current_thread restore_thread; | |
2883 | ||
2884 | /* Map between process_target and a representative inferior. This | |
2885 | is to avoid committing a resume in the same target more than | |
2886 | once. Resumptions must be idempotent, so this is an | |
2887 | optimization. */ | |
2888 | std::unordered_map<process_stratum_target *, inferior *> conn_inf; | |
2889 | ||
2890 | for (inferior *inf : all_non_exited_inferiors ()) | |
2891 | if (inf->has_execution ()) | |
2892 | conn_inf[inf->process_target ()] = inf; | |
2893 | ||
2894 | for (const auto &ci : conn_inf) | |
2895 | { | |
2896 | inferior *inf = ci.second; | |
2897 | switch_to_inferior_no_thread (inf); | |
2898 | target_commit_resume (); | |
2899 | } | |
2900 | } | |
2901 | ||
2f4fcf00 PA |
2902 | /* Check that all the targets we're about to resume are in non-stop |
2903 | mode. Ideally, we'd only care whether all targets support | |
2904 | target-async, but we're not there yet. E.g., stop_all_threads | |
2905 | doesn't know how to handle all-stop targets. Also, the remote | |
2906 | protocol in all-stop mode is synchronous, irrespective of | |
2907 | target-async, which means that things like a breakpoint re-set | |
2908 | triggered by one target would try to read memory from all targets | |
2909 | and fail. */ | |
2910 | ||
2911 | static void | |
2912 | check_multi_target_resumption (process_stratum_target *resume_target) | |
2913 | { | |
2914 | if (!non_stop && resume_target == nullptr) | |
2915 | { | |
2916 | scoped_restore_current_thread restore_thread; | |
2917 | ||
2918 | /* This is used to track whether we're resuming more than one | |
2919 | target. */ | |
2920 | process_stratum_target *first_connection = nullptr; | |
2921 | ||
2922 | /* The first inferior we see with a target that does not work in | |
2923 | always-non-stop mode. */ | |
2924 | inferior *first_not_non_stop = nullptr; | |
2925 | ||
2926 | for (inferior *inf : all_non_exited_inferiors (resume_target)) | |
2927 | { | |
2928 | switch_to_inferior_no_thread (inf); | |
2929 | ||
2930 | if (!target_has_execution) | |
2931 | continue; | |
2932 | ||
2933 | process_stratum_target *proc_target | |
2934 | = current_inferior ()->process_target(); | |
2935 | ||
2936 | if (!target_is_non_stop_p ()) | |
2937 | first_not_non_stop = inf; | |
2938 | ||
2939 | if (first_connection == nullptr) | |
2940 | first_connection = proc_target; | |
2941 | else if (first_connection != proc_target | |
2942 | && first_not_non_stop != nullptr) | |
2943 | { | |
2944 | switch_to_inferior_no_thread (first_not_non_stop); | |
2945 | ||
2946 | proc_target = current_inferior ()->process_target(); | |
2947 | ||
2948 | error (_("Connection %d (%s) does not support " | |
2949 | "multi-target resumption."), | |
2950 | proc_target->connection_number, | |
2951 | make_target_connection_string (proc_target).c_str ()); | |
2952 | } | |
2953 | } | |
2954 | } | |
2955 | } | |
2956 | ||
c906108c SS |
2957 | /* Basic routine for continuing the program in various fashions. |
2958 | ||
2959 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
2960 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
2961 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
2962 | |
2963 | You should call clear_proceed_status before calling proceed. */ | |
2964 | ||
2965 | void | |
64ce06e4 | 2966 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2967 | { |
e58b0e63 PA |
2968 | struct regcache *regcache; |
2969 | struct gdbarch *gdbarch; | |
e58b0e63 | 2970 | CORE_ADDR pc; |
4d9d9d04 PA |
2971 | struct execution_control_state ecss; |
2972 | struct execution_control_state *ecs = &ecss; | |
4d9d9d04 | 2973 | int started; |
c906108c | 2974 | |
e58b0e63 PA |
2975 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2976 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2977 | resuming the current thread. */ | |
2978 | if (!follow_fork ()) | |
2979 | { | |
2980 | /* The target for some reason decided not to resume. */ | |
2981 | normal_stop (); | |
f148b27e PA |
2982 | if (target_can_async_p ()) |
2983 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2984 | return; |
2985 | } | |
2986 | ||
842951eb PA |
2987 | /* We'll update this if & when we switch to a new thread. */ |
2988 | previous_inferior_ptid = inferior_ptid; | |
2989 | ||
e58b0e63 | 2990 | regcache = get_current_regcache (); |
ac7936df | 2991 | gdbarch = regcache->arch (); |
8b86c959 YQ |
2992 | const address_space *aspace = regcache->aspace (); |
2993 | ||
e58b0e63 | 2994 | pc = regcache_read_pc (regcache); |
08036331 | 2995 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 2996 | |
99619bea | 2997 | /* Fill in with reasonable starting values. */ |
08036331 | 2998 | init_thread_stepping_state (cur_thr); |
99619bea | 2999 | |
08036331 | 3000 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 3001 | |
5b6d1e4f PA |
3002 | ptid_t resume_ptid |
3003 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
3004 | process_stratum_target *resume_target | |
3005 | = user_visible_resume_target (resume_ptid); | |
3006 | ||
2f4fcf00 PA |
3007 | check_multi_target_resumption (resume_target); |
3008 | ||
2acceee2 | 3009 | if (addr == (CORE_ADDR) -1) |
c906108c | 3010 | { |
08036331 | 3011 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 3012 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 3013 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
3014 | /* There is a breakpoint at the address we will resume at, |
3015 | step one instruction before inserting breakpoints so that | |
3016 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
3017 | breakpoint). |
3018 | ||
3019 | Note, we don't do this in reverse, because we won't | |
3020 | actually be executing the breakpoint insn anyway. | |
3021 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 3022 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
3023 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3024 | && gdbarch_single_step_through_delay (gdbarch, | |
3025 | get_current_frame ())) | |
3352ef37 AC |
3026 | /* We stepped onto an instruction that needs to be stepped |
3027 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 3028 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
3029 | } |
3030 | else | |
3031 | { | |
515630c5 | 3032 | regcache_write_pc (regcache, addr); |
c906108c SS |
3033 | } |
3034 | ||
70509625 | 3035 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 3036 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 3037 | |
4d9d9d04 PA |
3038 | /* If an exception is thrown from this point on, make sure to |
3039 | propagate GDB's knowledge of the executing state to the | |
3040 | frontend/user running state. */ | |
5b6d1e4f | 3041 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
3042 | |
3043 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3044 | threads (e.g., we might need to set threads stepping over | |
3045 | breakpoints first), from the user/frontend's point of view, all | |
3046 | threads in RESUME_PTID are now running. Unless we're calling an | |
3047 | inferior function, as in that case we pretend the inferior | |
3048 | doesn't run at all. */ | |
08036331 | 3049 | if (!cur_thr->control.in_infcall) |
719546c4 | 3050 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3051 | |
527159b7 | 3052 | if (debug_infrun) |
8a9de0e4 | 3053 | fprintf_unfiltered (gdb_stdlog, |
64ce06e4 | 3054 | "infrun: proceed (addr=%s, signal=%s)\n", |
c9737c08 | 3055 | paddress (gdbarch, addr), |
64ce06e4 | 3056 | gdb_signal_to_symbol_string (siggnal)); |
527159b7 | 3057 | |
4d9d9d04 PA |
3058 | annotate_starting (); |
3059 | ||
3060 | /* Make sure that output from GDB appears before output from the | |
3061 | inferior. */ | |
3062 | gdb_flush (gdb_stdout); | |
3063 | ||
d930703d PA |
3064 | /* Since we've marked the inferior running, give it the terminal. A |
3065 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3066 | still detect attempts to unblock a stuck connection with repeated | |
3067 | Ctrl-C from within target_pass_ctrlc). */ | |
3068 | target_terminal::inferior (); | |
3069 | ||
4d9d9d04 PA |
3070 | /* In a multi-threaded task we may select another thread and |
3071 | then continue or step. | |
3072 | ||
3073 | But if a thread that we're resuming had stopped at a breakpoint, | |
3074 | it will immediately cause another breakpoint stop without any | |
3075 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3076 | we must step over it first. | |
3077 | ||
3078 | Look for threads other than the current (TP) that reported a | |
3079 | breakpoint hit and haven't been resumed yet since. */ | |
3080 | ||
3081 | /* If scheduler locking applies, we can avoid iterating over all | |
3082 | threads. */ | |
08036331 | 3083 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3084 | { |
5b6d1e4f PA |
3085 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3086 | resume_ptid)) | |
08036331 | 3087 | { |
f3f8ece4 PA |
3088 | switch_to_thread_no_regs (tp); |
3089 | ||
4d9d9d04 PA |
3090 | /* Ignore the current thread here. It's handled |
3091 | afterwards. */ | |
08036331 | 3092 | if (tp == cur_thr) |
4d9d9d04 | 3093 | continue; |
c906108c | 3094 | |
4d9d9d04 PA |
3095 | if (!thread_still_needs_step_over (tp)) |
3096 | continue; | |
3097 | ||
3098 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3099 | |
99619bea PA |
3100 | if (debug_infrun) |
3101 | fprintf_unfiltered (gdb_stdlog, | |
3102 | "infrun: need to step-over [%s] first\n", | |
a068643d | 3103 | target_pid_to_str (tp->ptid).c_str ()); |
99619bea | 3104 | |
4d9d9d04 | 3105 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3106 | } |
f3f8ece4 PA |
3107 | |
3108 | switch_to_thread (cur_thr); | |
30852783 UW |
3109 | } |
3110 | ||
4d9d9d04 PA |
3111 | /* Enqueue the current thread last, so that we move all other |
3112 | threads over their breakpoints first. */ | |
08036331 PA |
3113 | if (cur_thr->stepping_over_breakpoint) |
3114 | thread_step_over_chain_enqueue (cur_thr); | |
30852783 | 3115 | |
4d9d9d04 PA |
3116 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3117 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3118 | advanced. Must do this before resuming any thread, as in | |
3119 | all-stop/remote, once we resume we can't send any other packet | |
3120 | until the target stops again. */ | |
08036331 | 3121 | cur_thr->prev_pc = regcache_read_pc (regcache); |
99619bea | 3122 | |
a9bc57b9 TT |
3123 | { |
3124 | scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume (); | |
85ad3aaf | 3125 | |
a9bc57b9 | 3126 | started = start_step_over (); |
c906108c | 3127 | |
a9bc57b9 TT |
3128 | if (step_over_info_valid_p ()) |
3129 | { | |
3130 | /* Either this thread started a new in-line step over, or some | |
3131 | other thread was already doing one. In either case, don't | |
3132 | resume anything else until the step-over is finished. */ | |
3133 | } | |
3134 | else if (started && !target_is_non_stop_p ()) | |
3135 | { | |
3136 | /* A new displaced stepping sequence was started. In all-stop, | |
3137 | we can't talk to the target anymore until it next stops. */ | |
3138 | } | |
3139 | else if (!non_stop && target_is_non_stop_p ()) | |
3140 | { | |
3141 | /* In all-stop, but the target is always in non-stop mode. | |
3142 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3143 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3144 | resume_ptid)) | |
3145 | { | |
3146 | switch_to_thread_no_regs (tp); | |
3147 | ||
f9fac3c8 SM |
3148 | if (!tp->inf->has_execution ()) |
3149 | { | |
3150 | if (debug_infrun) | |
3151 | fprintf_unfiltered (gdb_stdlog, | |
3152 | "infrun: proceed: [%s] target has " | |
3153 | "no execution\n", | |
3154 | target_pid_to_str (tp->ptid).c_str ()); | |
3155 | continue; | |
3156 | } | |
f3f8ece4 | 3157 | |
f9fac3c8 SM |
3158 | if (tp->resumed) |
3159 | { | |
3160 | if (debug_infrun) | |
3161 | fprintf_unfiltered (gdb_stdlog, | |
3162 | "infrun: proceed: [%s] resumed\n", | |
3163 | target_pid_to_str (tp->ptid).c_str ()); | |
3164 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
3165 | continue; | |
3166 | } | |
fbea99ea | 3167 | |
f9fac3c8 SM |
3168 | if (thread_is_in_step_over_chain (tp)) |
3169 | { | |
3170 | if (debug_infrun) | |
3171 | fprintf_unfiltered (gdb_stdlog, | |
3172 | "infrun: proceed: [%s] needs step-over\n", | |
3173 | target_pid_to_str (tp->ptid).c_str ()); | |
3174 | continue; | |
3175 | } | |
fbea99ea | 3176 | |
f9fac3c8 SM |
3177 | if (debug_infrun) |
3178 | fprintf_unfiltered (gdb_stdlog, | |
3179 | "infrun: proceed: resuming %s\n", | |
3180 | target_pid_to_str (tp->ptid).c_str ()); | |
fbea99ea | 3181 | |
f9fac3c8 SM |
3182 | reset_ecs (ecs, tp); |
3183 | switch_to_thread (tp); | |
3184 | keep_going_pass_signal (ecs); | |
3185 | if (!ecs->wait_some_more) | |
3186 | error (_("Command aborted.")); | |
3187 | } | |
a9bc57b9 | 3188 | } |
08036331 | 3189 | else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3190 | { |
3191 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3192 | reset_ecs (ecs, cur_thr); |
3193 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3194 | keep_going_pass_signal (ecs); |
3195 | if (!ecs->wait_some_more) | |
3196 | error (_("Command aborted.")); | |
3197 | } | |
3198 | } | |
c906108c | 3199 | |
5b6d1e4f | 3200 | commit_resume_all_targets (); |
85ad3aaf | 3201 | |
731f534f | 3202 | finish_state.release (); |
c906108c | 3203 | |
873657b9 PA |
3204 | /* If we've switched threads above, switch back to the previously |
3205 | current thread. We don't want the user to see a different | |
3206 | selected thread. */ | |
3207 | switch_to_thread (cur_thr); | |
3208 | ||
0b333c5e PA |
3209 | /* Tell the event loop to wait for it to stop. If the target |
3210 | supports asynchronous execution, it'll do this from within | |
3211 | target_resume. */ | |
362646f5 | 3212 | if (!target_can_async_p ()) |
0b333c5e | 3213 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3214 | } |
c906108c SS |
3215 | \f |
3216 | ||
3217 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3218 | |
c906108c | 3219 | void |
8621d6a9 | 3220 | start_remote (int from_tty) |
c906108c | 3221 | { |
5b6d1e4f PA |
3222 | inferior *inf = current_inferior (); |
3223 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3224 | |
1777feb0 | 3225 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3226 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3227 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3228 | nothing is returned (instead of just blocking). Because of this, |
3229 | targets expecting an immediate response need to, internally, set | |
3230 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3231 | timeout. */ |
6426a772 JM |
3232 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3233 | differentiate to its caller what the state of the target is after | |
3234 | the initial open has been performed. Here we're assuming that | |
3235 | the target has stopped. It should be possible to eventually have | |
3236 | target_open() return to the caller an indication that the target | |
3237 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3238 | for an async run. */ |
5b6d1e4f | 3239 | wait_for_inferior (inf); |
8621d6a9 DJ |
3240 | |
3241 | /* Now that the inferior has stopped, do any bookkeeping like | |
3242 | loading shared libraries. We want to do this before normal_stop, | |
3243 | so that the displayed frame is up to date. */ | |
8b88a78e | 3244 | post_create_inferior (current_top_target (), from_tty); |
8621d6a9 | 3245 | |
6426a772 | 3246 | normal_stop (); |
c906108c SS |
3247 | } |
3248 | ||
3249 | /* Initialize static vars when a new inferior begins. */ | |
3250 | ||
3251 | void | |
96baa820 | 3252 | init_wait_for_inferior (void) |
c906108c SS |
3253 | { |
3254 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3255 | |
c906108c SS |
3256 | breakpoint_init_inferior (inf_starting); |
3257 | ||
70509625 | 3258 | clear_proceed_status (0); |
9f976b41 | 3259 | |
ab1ddbcf | 3260 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3261 | |
842951eb | 3262 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3263 | } |
237fc4c9 | 3264 | |
c906108c | 3265 | \f |
488f131b | 3266 | |
ec9499be | 3267 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3268 | |
568d6575 UW |
3269 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3270 | struct execution_control_state *ecs); | |
3271 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3272 | struct execution_control_state *ecs); | |
4f5d7f63 | 3273 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3274 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3275 | struct frame_info *); |
611c83ae | 3276 | |
bdc36728 | 3277 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3278 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3279 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3280 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3281 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3282 | |
252fbfc8 PA |
3283 | /* This function is attached as a "thread_stop_requested" observer. |
3284 | Cleanup local state that assumed the PTID was to be resumed, and | |
3285 | report the stop to the frontend. */ | |
3286 | ||
2c0b251b | 3287 | static void |
252fbfc8 PA |
3288 | infrun_thread_stop_requested (ptid_t ptid) |
3289 | { | |
5b6d1e4f PA |
3290 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3291 | ||
c65d6b55 PA |
3292 | /* PTID was requested to stop. If the thread was already stopped, |
3293 | but the user/frontend doesn't know about that yet (e.g., the | |
3294 | thread had been temporarily paused for some step-over), set up | |
3295 | for reporting the stop now. */ | |
5b6d1e4f | 3296 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3297 | { |
3298 | if (tp->state != THREAD_RUNNING) | |
3299 | continue; | |
3300 | if (tp->executing) | |
3301 | continue; | |
c65d6b55 | 3302 | |
08036331 PA |
3303 | /* Remove matching threads from the step-over queue, so |
3304 | start_step_over doesn't try to resume them | |
3305 | automatically. */ | |
3306 | if (thread_is_in_step_over_chain (tp)) | |
3307 | thread_step_over_chain_remove (tp); | |
c65d6b55 | 3308 | |
08036331 PA |
3309 | /* If the thread is stopped, but the user/frontend doesn't |
3310 | know about that yet, queue a pending event, as if the | |
3311 | thread had just stopped now. Unless the thread already had | |
3312 | a pending event. */ | |
3313 | if (!tp->suspend.waitstatus_pending_p) | |
3314 | { | |
3315 | tp->suspend.waitstatus_pending_p = 1; | |
3316 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3317 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3318 | } | |
c65d6b55 | 3319 | |
08036331 PA |
3320 | /* Clear the inline-frame state, since we're re-processing the |
3321 | stop. */ | |
5b6d1e4f | 3322 | clear_inline_frame_state (tp); |
c65d6b55 | 3323 | |
08036331 PA |
3324 | /* If this thread was paused because some other thread was |
3325 | doing an inline-step over, let that finish first. Once | |
3326 | that happens, we'll restart all threads and consume pending | |
3327 | stop events then. */ | |
3328 | if (step_over_info_valid_p ()) | |
3329 | continue; | |
3330 | ||
3331 | /* Otherwise we can process the (new) pending event now. Set | |
3332 | it so this pending event is considered by | |
3333 | do_target_wait. */ | |
719546c4 | 3334 | tp->resumed = true; |
08036331 | 3335 | } |
252fbfc8 PA |
3336 | } |
3337 | ||
a07daef3 PA |
3338 | static void |
3339 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3340 | { | |
5b6d1e4f PA |
3341 | if (target_last_proc_target == tp->inf->process_target () |
3342 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3343 | nullify_last_target_wait_ptid (); |
3344 | } | |
3345 | ||
0cbcdb96 PA |
3346 | /* Delete the step resume, single-step and longjmp/exception resume |
3347 | breakpoints of TP. */ | |
4e1c45ea | 3348 | |
0cbcdb96 PA |
3349 | static void |
3350 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3351 | { |
0cbcdb96 PA |
3352 | delete_step_resume_breakpoint (tp); |
3353 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3354 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3355 | } |
3356 | ||
0cbcdb96 PA |
3357 | /* If the target still has execution, call FUNC for each thread that |
3358 | just stopped. In all-stop, that's all the non-exited threads; in | |
3359 | non-stop, that's the current thread, only. */ | |
3360 | ||
3361 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3362 | (struct thread_info *tp); | |
4e1c45ea PA |
3363 | |
3364 | static void | |
0cbcdb96 | 3365 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3366 | { |
d7e15655 | 3367 | if (!target_has_execution || inferior_ptid == null_ptid) |
4e1c45ea PA |
3368 | return; |
3369 | ||
fbea99ea | 3370 | if (target_is_non_stop_p ()) |
4e1c45ea | 3371 | { |
0cbcdb96 PA |
3372 | /* If in non-stop mode, only the current thread stopped. */ |
3373 | func (inferior_thread ()); | |
4e1c45ea PA |
3374 | } |
3375 | else | |
0cbcdb96 | 3376 | { |
0cbcdb96 | 3377 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3378 | for (thread_info *tp : all_non_exited_threads ()) |
3379 | func (tp); | |
0cbcdb96 PA |
3380 | } |
3381 | } | |
3382 | ||
3383 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3384 | the threads that just stopped. */ | |
3385 | ||
3386 | static void | |
3387 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3388 | { | |
3389 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3390 | } |
3391 | ||
3392 | /* Delete the single-step breakpoints of the threads that just | |
3393 | stopped. */ | |
7c16b83e | 3394 | |
34b7e8a6 PA |
3395 | static void |
3396 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3397 | { | |
3398 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3399 | } |
3400 | ||
221e1a37 | 3401 | /* See infrun.h. */ |
223698f8 | 3402 | |
221e1a37 | 3403 | void |
223698f8 DE |
3404 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3405 | const struct target_waitstatus *ws) | |
3406 | { | |
23fdd69e | 3407 | std::string status_string = target_waitstatus_to_string (ws); |
d7e74731 | 3408 | string_file stb; |
223698f8 DE |
3409 | |
3410 | /* The text is split over several lines because it was getting too long. | |
3411 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3412 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3413 | is set. */ | |
3414 | ||
d7e74731 | 3415 | stb.printf ("infrun: target_wait (%d.%ld.%ld", |
e99b03dc | 3416 | waiton_ptid.pid (), |
e38504b3 | 3417 | waiton_ptid.lwp (), |
cc6bcb54 | 3418 | waiton_ptid.tid ()); |
e99b03dc | 3419 | if (waiton_ptid.pid () != -1) |
a068643d | 3420 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid).c_str ()); |
d7e74731 PA |
3421 | stb.printf (", status) =\n"); |
3422 | stb.printf ("infrun: %d.%ld.%ld [%s],\n", | |
e99b03dc | 3423 | result_ptid.pid (), |
e38504b3 | 3424 | result_ptid.lwp (), |
cc6bcb54 | 3425 | result_ptid.tid (), |
a068643d | 3426 | target_pid_to_str (result_ptid).c_str ()); |
23fdd69e | 3427 | stb.printf ("infrun: %s\n", status_string.c_str ()); |
223698f8 DE |
3428 | |
3429 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3430 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3431 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3432 | } |
3433 | ||
372316f1 PA |
3434 | /* Select a thread at random, out of those which are resumed and have |
3435 | had events. */ | |
3436 | ||
3437 | static struct thread_info * | |
5b6d1e4f | 3438 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3439 | { |
372316f1 | 3440 | int num_events = 0; |
08036331 | 3441 | |
5b6d1e4f | 3442 | auto has_event = [&] (thread_info *tp) |
08036331 | 3443 | { |
5b6d1e4f PA |
3444 | return (tp->ptid.matches (waiton_ptid) |
3445 | && tp->resumed | |
08036331 PA |
3446 | && tp->suspend.waitstatus_pending_p); |
3447 | }; | |
372316f1 PA |
3448 | |
3449 | /* First see how many events we have. Count only resumed threads | |
3450 | that have an event pending. */ | |
5b6d1e4f | 3451 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3452 | if (has_event (tp)) |
372316f1 PA |
3453 | num_events++; |
3454 | ||
3455 | if (num_events == 0) | |
3456 | return NULL; | |
3457 | ||
3458 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3459 | int random_selector = (int) ((num_events * (double) rand ()) |
3460 | / (RAND_MAX + 1.0)); | |
372316f1 PA |
3461 | |
3462 | if (debug_infrun && num_events > 1) | |
3463 | fprintf_unfiltered (gdb_stdlog, | |
3464 | "infrun: Found %d events, selecting #%d\n", | |
3465 | num_events, random_selector); | |
3466 | ||
3467 | /* Select the Nth thread that has had an event. */ | |
5b6d1e4f | 3468 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3469 | if (has_event (tp)) |
372316f1 | 3470 | if (random_selector-- == 0) |
08036331 | 3471 | return tp; |
372316f1 | 3472 | |
08036331 | 3473 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3474 | } |
3475 | ||
3476 | /* Wrapper for target_wait that first checks whether threads have | |
3477 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3478 | more events. INF is the inferior we're using to call target_wait |
3479 | on. */ | |
372316f1 PA |
3480 | |
3481 | static ptid_t | |
5b6d1e4f PA |
3482 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
3483 | target_waitstatus *status, int options) | |
372316f1 PA |
3484 | { |
3485 | ptid_t event_ptid; | |
3486 | struct thread_info *tp; | |
3487 | ||
24ed6739 AB |
3488 | /* We know that we are looking for an event in the target of inferior |
3489 | INF, but we don't know which thread the event might come from. As | |
3490 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3491 | the wait code relies on it - doing so is always a mistake. */ | |
3492 | switch_to_inferior_no_thread (inf); | |
3493 | ||
372316f1 PA |
3494 | /* First check if there is a resumed thread with a wait status |
3495 | pending. */ | |
d7e15655 | 3496 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3497 | { |
5b6d1e4f | 3498 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3499 | } |
3500 | else | |
3501 | { | |
3502 | if (debug_infrun) | |
3503 | fprintf_unfiltered (gdb_stdlog, | |
3504 | "infrun: Waiting for specific thread %s.\n", | |
a068643d | 3505 | target_pid_to_str (ptid).c_str ()); |
372316f1 PA |
3506 | |
3507 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3508 | tp = find_thread_ptid (inf, ptid); |
372316f1 PA |
3509 | gdb_assert (tp != NULL); |
3510 | if (!tp->suspend.waitstatus_pending_p) | |
3511 | tp = NULL; | |
3512 | } | |
3513 | ||
3514 | if (tp != NULL | |
3515 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3516 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3517 | { | |
00431a78 | 3518 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3519 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3520 | CORE_ADDR pc; |
3521 | int discard = 0; | |
3522 | ||
3523 | pc = regcache_read_pc (regcache); | |
3524 | ||
3525 | if (pc != tp->suspend.stop_pc) | |
3526 | { | |
3527 | if (debug_infrun) | |
3528 | fprintf_unfiltered (gdb_stdlog, | |
3529 | "infrun: PC of %s changed. was=%s, now=%s\n", | |
a068643d | 3530 | target_pid_to_str (tp->ptid).c_str (), |
defd2172 | 3531 | paddress (gdbarch, tp->suspend.stop_pc), |
372316f1 PA |
3532 | paddress (gdbarch, pc)); |
3533 | discard = 1; | |
3534 | } | |
a01bda52 | 3535 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 PA |
3536 | { |
3537 | if (debug_infrun) | |
3538 | fprintf_unfiltered (gdb_stdlog, | |
3539 | "infrun: previous breakpoint of %s, at %s gone\n", | |
a068643d | 3540 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
3541 | paddress (gdbarch, pc)); |
3542 | ||
3543 | discard = 1; | |
3544 | } | |
3545 | ||
3546 | if (discard) | |
3547 | { | |
3548 | if (debug_infrun) | |
3549 | fprintf_unfiltered (gdb_stdlog, | |
3550 | "infrun: pending event of %s cancelled.\n", | |
a068643d | 3551 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
3552 | |
3553 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3554 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3555 | } | |
3556 | } | |
3557 | ||
3558 | if (tp != NULL) | |
3559 | { | |
3560 | if (debug_infrun) | |
3561 | { | |
23fdd69e SM |
3562 | std::string statstr |
3563 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 3564 | |
372316f1 PA |
3565 | fprintf_unfiltered (gdb_stdlog, |
3566 | "infrun: Using pending wait status %s for %s.\n", | |
23fdd69e | 3567 | statstr.c_str (), |
a068643d | 3568 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
3569 | } |
3570 | ||
3571 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3572 | if it was a software breakpoint (and the target doesn't | |
3573 | always adjust the PC itself). */ | |
3574 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3575 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3576 | { | |
3577 | struct regcache *regcache; | |
3578 | struct gdbarch *gdbarch; | |
3579 | int decr_pc; | |
3580 | ||
00431a78 | 3581 | regcache = get_thread_regcache (tp); |
ac7936df | 3582 | gdbarch = regcache->arch (); |
372316f1 PA |
3583 | |
3584 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3585 | if (decr_pc != 0) | |
3586 | { | |
3587 | CORE_ADDR pc; | |
3588 | ||
3589 | pc = regcache_read_pc (regcache); | |
3590 | regcache_write_pc (regcache, pc + decr_pc); | |
3591 | } | |
3592 | } | |
3593 | ||
3594 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3595 | *status = tp->suspend.waitstatus; | |
3596 | tp->suspend.waitstatus_pending_p = 0; | |
3597 | ||
3598 | /* Wake up the event loop again, until all pending events are | |
3599 | processed. */ | |
3600 | if (target_is_async_p ()) | |
3601 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3602 | return tp->ptid; | |
3603 | } | |
3604 | ||
3605 | /* But if we don't find one, we'll have to wait. */ | |
3606 | ||
3607 | if (deprecated_target_wait_hook) | |
3608 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3609 | else | |
3610 | event_ptid = target_wait (ptid, status, options); | |
3611 | ||
3612 | return event_ptid; | |
3613 | } | |
3614 | ||
5b6d1e4f PA |
3615 | /* Returns true if INF has any resumed thread with a status |
3616 | pending. */ | |
3617 | ||
3618 | static bool | |
3619 | threads_are_resumed_pending_p (inferior *inf) | |
3620 | { | |
3621 | for (thread_info *tp : inf->non_exited_threads ()) | |
3622 | if (tp->resumed | |
3623 | && tp->suspend.waitstatus_pending_p) | |
3624 | return true; | |
3625 | ||
3626 | return false; | |
3627 | } | |
3628 | ||
3629 | /* Wrapper for target_wait that first checks whether threads have | |
3630 | pending statuses to report before actually asking the target for | |
3631 | more events. Polls for events from all inferiors/targets. */ | |
3632 | ||
3633 | static bool | |
3634 | do_target_wait (ptid_t wait_ptid, execution_control_state *ecs, int options) | |
3635 | { | |
3636 | int num_inferiors = 0; | |
3637 | int random_selector; | |
3638 | ||
3639 | /* For fairness, we pick the first inferior/target to poll at | |
3640 | random, and then continue polling the rest of the inferior list | |
3641 | starting from that one in a circular fashion until the whole list | |
3642 | is polled once. */ | |
3643 | ||
3644 | auto inferior_matches = [&wait_ptid] (inferior *inf) | |
3645 | { | |
3646 | return (inf->process_target () != NULL | |
3647 | && (threads_are_executing (inf->process_target ()) | |
3648 | || threads_are_resumed_pending_p (inf)) | |
3649 | && ptid_t (inf->pid).matches (wait_ptid)); | |
3650 | }; | |
3651 | ||
3652 | /* First see how many resumed inferiors we have. */ | |
3653 | for (inferior *inf : all_inferiors ()) | |
3654 | if (inferior_matches (inf)) | |
3655 | num_inferiors++; | |
3656 | ||
3657 | if (num_inferiors == 0) | |
3658 | { | |
3659 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3660 | return false; | |
3661 | } | |
3662 | ||
3663 | /* Now randomly pick an inferior out of those that were resumed. */ | |
3664 | random_selector = (int) | |
3665 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3666 | ||
3667 | if (debug_infrun && num_inferiors > 1) | |
3668 | fprintf_unfiltered (gdb_stdlog, | |
3669 | "infrun: Found %d inferiors, starting at #%d\n", | |
3670 | num_inferiors, random_selector); | |
3671 | ||
3672 | /* Select the Nth inferior that was resumed. */ | |
3673 | ||
3674 | inferior *selected = nullptr; | |
3675 | ||
3676 | for (inferior *inf : all_inferiors ()) | |
3677 | if (inferior_matches (inf)) | |
3678 | if (random_selector-- == 0) | |
3679 | { | |
3680 | selected = inf; | |
3681 | break; | |
3682 | } | |
3683 | ||
3684 | /* Now poll for events out of each of the resumed inferior's | |
3685 | targets, starting from the selected one. */ | |
3686 | ||
3687 | auto do_wait = [&] (inferior *inf) | |
3688 | { | |
5b6d1e4f PA |
3689 | ecs->ptid = do_target_wait_1 (inf, wait_ptid, &ecs->ws, options); |
3690 | ecs->target = inf->process_target (); | |
3691 | return (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3692 | }; | |
3693 | ||
3694 | /* Needed in all-stop+target-non-stop mode, because we end up here | |
3695 | spuriously after the target is all stopped and we've already | |
3696 | reported the stop to the user, polling for events. */ | |
3697 | scoped_restore_current_thread restore_thread; | |
3698 | ||
3699 | int inf_num = selected->num; | |
3700 | for (inferior *inf = selected; inf != NULL; inf = inf->next) | |
3701 | if (inferior_matches (inf)) | |
3702 | if (do_wait (inf)) | |
3703 | return true; | |
3704 | ||
3705 | for (inferior *inf = inferior_list; | |
3706 | inf != NULL && inf->num < inf_num; | |
3707 | inf = inf->next) | |
3708 | if (inferior_matches (inf)) | |
3709 | if (do_wait (inf)) | |
3710 | return true; | |
3711 | ||
3712 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3713 | return false; | |
3714 | } | |
3715 | ||
24291992 PA |
3716 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3717 | detaching while a thread is displaced stepping is a recipe for | |
3718 | crashing it, as nothing would readjust the PC out of the scratch | |
3719 | pad. */ | |
3720 | ||
3721 | void | |
3722 | prepare_for_detach (void) | |
3723 | { | |
3724 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3725 | ptid_t pid_ptid = ptid_t (inf->pid); |
24291992 | 3726 | |
00431a78 | 3727 | displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf); |
24291992 PA |
3728 | |
3729 | /* Is any thread of this process displaced stepping? If not, | |
3730 | there's nothing else to do. */ | |
d20172fc | 3731 | if (displaced->step_thread == nullptr) |
24291992 PA |
3732 | return; |
3733 | ||
3734 | if (debug_infrun) | |
3735 | fprintf_unfiltered (gdb_stdlog, | |
3736 | "displaced-stepping in-process while detaching"); | |
3737 | ||
9bcb1f16 | 3738 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3739 | |
00431a78 | 3740 | while (displaced->step_thread != nullptr) |
24291992 | 3741 | { |
24291992 PA |
3742 | struct execution_control_state ecss; |
3743 | struct execution_control_state *ecs; | |
3744 | ||
3745 | ecs = &ecss; | |
3746 | memset (ecs, 0, sizeof (*ecs)); | |
3747 | ||
3748 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3749 | /* Flush target cache before starting to handle each event. |
3750 | Target was running and cache could be stale. This is just a | |
3751 | heuristic. Running threads may modify target memory, but we | |
3752 | don't get any event. */ | |
3753 | target_dcache_invalidate (); | |
24291992 | 3754 | |
5b6d1e4f | 3755 | do_target_wait (pid_ptid, ecs, 0); |
24291992 PA |
3756 | |
3757 | if (debug_infrun) | |
3758 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3759 | ||
3760 | /* If an error happens while handling the event, propagate GDB's | |
3761 | knowledge of the executing state to the frontend/user running | |
3762 | state. */ | |
5b6d1e4f PA |
3763 | scoped_finish_thread_state finish_state (inf->process_target (), |
3764 | minus_one_ptid); | |
24291992 PA |
3765 | |
3766 | /* Now figure out what to do with the result of the result. */ | |
3767 | handle_inferior_event (ecs); | |
3768 | ||
3769 | /* No error, don't finish the state yet. */ | |
731f534f | 3770 | finish_state.release (); |
24291992 PA |
3771 | |
3772 | /* Breakpoints and watchpoints are not installed on the target | |
3773 | at this point, and signals are passed directly to the | |
3774 | inferior, so this must mean the process is gone. */ | |
3775 | if (!ecs->wait_some_more) | |
3776 | { | |
9bcb1f16 | 3777 | restore_detaching.release (); |
24291992 PA |
3778 | error (_("Program exited while detaching")); |
3779 | } | |
3780 | } | |
3781 | ||
9bcb1f16 | 3782 | restore_detaching.release (); |
24291992 PA |
3783 | } |
3784 | ||
cd0fc7c3 | 3785 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3786 | |
cd0fc7c3 SS |
3787 | If inferior gets a signal, we may decide to start it up again |
3788 | instead of returning. That is why there is a loop in this function. | |
3789 | When this function actually returns it means the inferior | |
3790 | should be left stopped and GDB should read more commands. */ | |
3791 | ||
5b6d1e4f PA |
3792 | static void |
3793 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3794 | { |
527159b7 | 3795 | if (debug_infrun) |
ae123ec6 | 3796 | fprintf_unfiltered |
e4c8541f | 3797 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3798 | |
4c41382a | 3799 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3800 | |
e6f5c25b PA |
3801 | /* If an error happens while handling the event, propagate GDB's |
3802 | knowledge of the executing state to the frontend/user running | |
3803 | state. */ | |
5b6d1e4f PA |
3804 | scoped_finish_thread_state finish_state |
3805 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 3806 | |
c906108c SS |
3807 | while (1) |
3808 | { | |
ae25568b PA |
3809 | struct execution_control_state ecss; |
3810 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 3811 | |
ae25568b PA |
3812 | memset (ecs, 0, sizeof (*ecs)); |
3813 | ||
ec9499be | 3814 | overlay_cache_invalid = 1; |
ec9499be | 3815 | |
f15cb84a YQ |
3816 | /* Flush target cache before starting to handle each event. |
3817 | Target was running and cache could be stale. This is just a | |
3818 | heuristic. Running threads may modify target memory, but we | |
3819 | don't get any event. */ | |
3820 | target_dcache_invalidate (); | |
3821 | ||
5b6d1e4f PA |
3822 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
3823 | ecs->target = inf->process_target (); | |
c906108c | 3824 | |
f00150c9 | 3825 | if (debug_infrun) |
5b6d1e4f | 3826 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3827 | |
cd0fc7c3 SS |
3828 | /* Now figure out what to do with the result of the result. */ |
3829 | handle_inferior_event (ecs); | |
c906108c | 3830 | |
cd0fc7c3 SS |
3831 | if (!ecs->wait_some_more) |
3832 | break; | |
3833 | } | |
4e1c45ea | 3834 | |
e6f5c25b | 3835 | /* No error, don't finish the state yet. */ |
731f534f | 3836 | finish_state.release (); |
cd0fc7c3 | 3837 | } |
c906108c | 3838 | |
d3d4baed PA |
3839 | /* Cleanup that reinstalls the readline callback handler, if the |
3840 | target is running in the background. If while handling the target | |
3841 | event something triggered a secondary prompt, like e.g., a | |
3842 | pagination prompt, we'll have removed the callback handler (see | |
3843 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3844 | event loop, ready to process further input. Note this has no | |
3845 | effect if the handler hasn't actually been removed, because calling | |
3846 | rl_callback_handler_install resets the line buffer, thus losing | |
3847 | input. */ | |
3848 | ||
3849 | static void | |
d238133d | 3850 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 3851 | { |
3b12939d PA |
3852 | struct ui *ui = current_ui; |
3853 | ||
3854 | if (!ui->async) | |
6c400b59 PA |
3855 | { |
3856 | /* We're not going back to the top level event loop yet. Don't | |
3857 | install the readline callback, as it'd prep the terminal, | |
3858 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3859 | it the next time the prompt is displayed, when we're ready | |
3860 | for input. */ | |
3861 | return; | |
3862 | } | |
3863 | ||
3b12939d | 3864 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3865 | gdb_rl_callback_handler_reinstall (); |
3866 | } | |
3867 | ||
243a9253 PA |
3868 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3869 | that's just the event thread. In all-stop, that's all threads. */ | |
3870 | ||
3871 | static void | |
3872 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3873 | { | |
08036331 PA |
3874 | if (ecs->event_thread != NULL |
3875 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 3876 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
3877 | |
3878 | if (!non_stop) | |
3879 | { | |
08036331 | 3880 | for (thread_info *thr : all_non_exited_threads ()) |
243a9253 PA |
3881 | { |
3882 | if (thr->thread_fsm == NULL) | |
3883 | continue; | |
3884 | if (thr == ecs->event_thread) | |
3885 | continue; | |
3886 | ||
00431a78 | 3887 | switch_to_thread (thr); |
46e3ed7f | 3888 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
3889 | } |
3890 | ||
3891 | if (ecs->event_thread != NULL) | |
00431a78 | 3892 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3893 | } |
3894 | } | |
3895 | ||
3b12939d PA |
3896 | /* Helper for all_uis_check_sync_execution_done that works on the |
3897 | current UI. */ | |
3898 | ||
3899 | static void | |
3900 | check_curr_ui_sync_execution_done (void) | |
3901 | { | |
3902 | struct ui *ui = current_ui; | |
3903 | ||
3904 | if (ui->prompt_state == PROMPT_NEEDED | |
3905 | && ui->async | |
3906 | && !gdb_in_secondary_prompt_p (ui)) | |
3907 | { | |
223ffa71 | 3908 | target_terminal::ours (); |
76727919 | 3909 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3910 | ui_register_input_event_handler (ui); |
3b12939d PA |
3911 | } |
3912 | } | |
3913 | ||
3914 | /* See infrun.h. */ | |
3915 | ||
3916 | void | |
3917 | all_uis_check_sync_execution_done (void) | |
3918 | { | |
0e454242 | 3919 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3920 | { |
3921 | check_curr_ui_sync_execution_done (); | |
3922 | } | |
3923 | } | |
3924 | ||
a8836c93 PA |
3925 | /* See infrun.h. */ |
3926 | ||
3927 | void | |
3928 | all_uis_on_sync_execution_starting (void) | |
3929 | { | |
0e454242 | 3930 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3931 | { |
3932 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3933 | async_disable_stdin (); | |
3934 | } | |
3935 | } | |
3936 | ||
1777feb0 | 3937 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3938 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3939 | descriptor corresponding to the target. It can be called more than |
3940 | once to complete a single execution command. In such cases we need | |
3941 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3942 | that this function is called for a single execution command, then |
3943 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3944 | necessary cleanups. */ |
43ff13b4 JM |
3945 | |
3946 | void | |
fba45db2 | 3947 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3948 | { |
0d1e5fa7 | 3949 | struct execution_control_state ecss; |
a474d7c2 | 3950 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 3951 | int cmd_done = 0; |
43ff13b4 | 3952 | |
0d1e5fa7 PA |
3953 | memset (ecs, 0, sizeof (*ecs)); |
3954 | ||
c61db772 PA |
3955 | /* Events are always processed with the main UI as current UI. This |
3956 | way, warnings, debug output, etc. are always consistently sent to | |
3957 | the main console. */ | |
4b6749b9 | 3958 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3959 | |
d3d4baed | 3960 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
3961 | { |
3962 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
3963 | ||
3964 | /* We're handling a live event, so make sure we're doing live | |
3965 | debugging. If we're looking at traceframes while the target is | |
3966 | running, we're going to need to get back to that mode after | |
3967 | handling the event. */ | |
3968 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
3969 | if (non_stop) | |
3970 | { | |
3971 | maybe_restore_traceframe.emplace (); | |
3972 | set_current_traceframe (-1); | |
3973 | } | |
43ff13b4 | 3974 | |
873657b9 PA |
3975 | /* The user/frontend should not notice a thread switch due to |
3976 | internal events. Make sure we revert to the user selected | |
3977 | thread and frame after handling the event and running any | |
3978 | breakpoint commands. */ | |
3979 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
3980 | |
3981 | overlay_cache_invalid = 1; | |
3982 | /* Flush target cache before starting to handle each event. Target | |
3983 | was running and cache could be stale. This is just a heuristic. | |
3984 | Running threads may modify target memory, but we don't get any | |
3985 | event. */ | |
3986 | target_dcache_invalidate (); | |
3987 | ||
3988 | scoped_restore save_exec_dir | |
3989 | = make_scoped_restore (&execution_direction, | |
3990 | target_execution_direction ()); | |
3991 | ||
5b6d1e4f PA |
3992 | if (!do_target_wait (minus_one_ptid, ecs, TARGET_WNOHANG)) |
3993 | return; | |
3994 | ||
3995 | gdb_assert (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3996 | ||
3997 | /* Switch to the target that generated the event, so we can do | |
3998 | target calls. Any inferior bound to the target will do, so we | |
3999 | just switch to the first we find. */ | |
4000 | for (inferior *inf : all_inferiors (ecs->target)) | |
4001 | { | |
4002 | switch_to_inferior_no_thread (inf); | |
4003 | break; | |
4004 | } | |
d238133d TT |
4005 | |
4006 | if (debug_infrun) | |
5b6d1e4f | 4007 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
d238133d TT |
4008 | |
4009 | /* If an error happens while handling the event, propagate GDB's | |
4010 | knowledge of the executing state to the frontend/user running | |
4011 | state. */ | |
4012 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 4013 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 4014 | |
979a0d13 | 4015 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
4016 | still for the thread which has thrown the exception. */ |
4017 | auto defer_bpstat_clear | |
4018 | = make_scope_exit (bpstat_clear_actions); | |
4019 | auto defer_delete_threads | |
4020 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
4021 | ||
4022 | /* Now figure out what to do with the result of the result. */ | |
4023 | handle_inferior_event (ecs); | |
4024 | ||
4025 | if (!ecs->wait_some_more) | |
4026 | { | |
5b6d1e4f | 4027 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
d238133d TT |
4028 | int should_stop = 1; |
4029 | struct thread_info *thr = ecs->event_thread; | |
d6b48e9c | 4030 | |
d238133d | 4031 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 4032 | |
d238133d TT |
4033 | if (thr != NULL) |
4034 | { | |
4035 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 4036 | |
d238133d | 4037 | if (thread_fsm != NULL) |
46e3ed7f | 4038 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 4039 | } |
243a9253 | 4040 | |
d238133d TT |
4041 | if (!should_stop) |
4042 | { | |
4043 | keep_going (ecs); | |
4044 | } | |
4045 | else | |
4046 | { | |
46e3ed7f | 4047 | bool should_notify_stop = true; |
d238133d | 4048 | int proceeded = 0; |
1840d81a | 4049 | |
d238133d | 4050 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 4051 | |
d238133d | 4052 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 4053 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 4054 | |
d238133d TT |
4055 | if (should_notify_stop) |
4056 | { | |
4057 | /* We may not find an inferior if this was a process exit. */ | |
4058 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
4059 | proceeded = normal_stop (); | |
4060 | } | |
243a9253 | 4061 | |
d238133d TT |
4062 | if (!proceeded) |
4063 | { | |
4064 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
4065 | cmd_done = 1; | |
4066 | } | |
873657b9 PA |
4067 | |
4068 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
4069 | previously selected thread is gone. We have two | |
4070 | choices - switch to no thread selected, or restore the | |
4071 | previously selected thread (now exited). We chose the | |
4072 | later, just because that's what GDB used to do. After | |
4073 | this, "info threads" says "The current thread <Thread | |
4074 | ID 2> has terminated." instead of "No thread | |
4075 | selected.". */ | |
4076 | if (!non_stop | |
4077 | && cmd_done | |
4078 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
4079 | restore_thread.dont_restore (); | |
d238133d TT |
4080 | } |
4081 | } | |
4f8d22e3 | 4082 | |
d238133d TT |
4083 | defer_delete_threads.release (); |
4084 | defer_bpstat_clear.release (); | |
29f49a6a | 4085 | |
d238133d TT |
4086 | /* No error, don't finish the thread states yet. */ |
4087 | finish_state.release (); | |
731f534f | 4088 | |
d238133d TT |
4089 | /* This scope is used to ensure that readline callbacks are |
4090 | reinstalled here. */ | |
4091 | } | |
4f8d22e3 | 4092 | |
3b12939d PA |
4093 | /* If a UI was in sync execution mode, and now isn't, restore its |
4094 | prompt (a synchronous execution command has finished, and we're | |
4095 | ready for input). */ | |
4096 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4097 | |
4098 | if (cmd_done | |
0f641c01 | 4099 | && exec_done_display_p |
00431a78 PA |
4100 | && (inferior_ptid == null_ptid |
4101 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 4102 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
4103 | } |
4104 | ||
29734269 SM |
4105 | /* See infrun.h. */ |
4106 | ||
edb3359d | 4107 | void |
29734269 SM |
4108 | set_step_info (thread_info *tp, struct frame_info *frame, |
4109 | struct symtab_and_line sal) | |
edb3359d | 4110 | { |
29734269 SM |
4111 | /* This can be removed once this function no longer implicitly relies on the |
4112 | inferior_ptid value. */ | |
4113 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4114 | |
16c381f0 JK |
4115 | tp->control.step_frame_id = get_frame_id (frame); |
4116 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4117 | |
4118 | tp->current_symtab = sal.symtab; | |
4119 | tp->current_line = sal.line; | |
4120 | } | |
4121 | ||
0d1e5fa7 PA |
4122 | /* Clear context switchable stepping state. */ |
4123 | ||
4124 | void | |
4e1c45ea | 4125 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4126 | { |
7f5ef605 | 4127 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4128 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4129 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4130 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4131 | } |
4132 | ||
ab1ddbcf | 4133 | /* See infrun.h. */ |
c32c64b7 | 4134 | |
6efcd9a8 | 4135 | void |
5b6d1e4f PA |
4136 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
4137 | target_waitstatus status) | |
c32c64b7 | 4138 | { |
5b6d1e4f | 4139 | target_last_proc_target = target; |
c32c64b7 DE |
4140 | target_last_wait_ptid = ptid; |
4141 | target_last_waitstatus = status; | |
4142 | } | |
4143 | ||
ab1ddbcf | 4144 | /* See infrun.h. */ |
e02bc4cc DS |
4145 | |
4146 | void | |
5b6d1e4f PA |
4147 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4148 | target_waitstatus *status) | |
e02bc4cc | 4149 | { |
5b6d1e4f PA |
4150 | if (target != nullptr) |
4151 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4152 | if (ptid != nullptr) |
4153 | *ptid = target_last_wait_ptid; | |
4154 | if (status != nullptr) | |
4155 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4156 | } |
4157 | ||
ab1ddbcf PA |
4158 | /* See infrun.h. */ |
4159 | ||
ac264b3b MS |
4160 | void |
4161 | nullify_last_target_wait_ptid (void) | |
4162 | { | |
5b6d1e4f | 4163 | target_last_proc_target = nullptr; |
ac264b3b | 4164 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4165 | target_last_waitstatus = {}; |
ac264b3b MS |
4166 | } |
4167 | ||
dcf4fbde | 4168 | /* Switch thread contexts. */ |
dd80620e MS |
4169 | |
4170 | static void | |
00431a78 | 4171 | context_switch (execution_control_state *ecs) |
dd80620e | 4172 | { |
00431a78 PA |
4173 | if (debug_infrun |
4174 | && ecs->ptid != inferior_ptid | |
5b6d1e4f PA |
4175 | && (inferior_ptid == null_ptid |
4176 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 DJ |
4177 | { |
4178 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
a068643d | 4179 | target_pid_to_str (inferior_ptid).c_str ()); |
fd48f117 | 4180 | fprintf_unfiltered (gdb_stdlog, "to %s\n", |
a068643d | 4181 | target_pid_to_str (ecs->ptid).c_str ()); |
fd48f117 DJ |
4182 | } |
4183 | ||
00431a78 | 4184 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4185 | } |
4186 | ||
d8dd4d5f PA |
4187 | /* If the target can't tell whether we've hit breakpoints |
4188 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4189 | check whether that could have been caused by a breakpoint. If so, | |
4190 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4191 | ||
4fa8626c | 4192 | static void |
d8dd4d5f PA |
4193 | adjust_pc_after_break (struct thread_info *thread, |
4194 | struct target_waitstatus *ws) | |
4fa8626c | 4195 | { |
24a73cce UW |
4196 | struct regcache *regcache; |
4197 | struct gdbarch *gdbarch; | |
118e6252 | 4198 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4199 | |
4fa8626c DJ |
4200 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4201 | we aren't, just return. | |
9709f61c DJ |
4202 | |
4203 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4204 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4205 | implemented by software breakpoints should be handled through the normal | |
4206 | breakpoint layer. | |
8fb3e588 | 4207 | |
4fa8626c DJ |
4208 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4209 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4210 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4211 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4212 | generates these signals at breakpoints (the code has been in GDB since at | |
4213 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4214 | |
e6cf7916 UW |
4215 | In earlier versions of GDB, a target with |
4216 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4217 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4218 | target with both of these set in GDB history, and it seems unlikely to be | |
4219 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4220 | |
d8dd4d5f | 4221 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4222 | return; |
4223 | ||
d8dd4d5f | 4224 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4225 | return; |
4226 | ||
4058b839 PA |
4227 | /* In reverse execution, when a breakpoint is hit, the instruction |
4228 | under it has already been de-executed. The reported PC always | |
4229 | points at the breakpoint address, so adjusting it further would | |
4230 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4231 | architecture: | |
4232 | ||
4233 | B1 0x08000000 : INSN1 | |
4234 | B2 0x08000001 : INSN2 | |
4235 | 0x08000002 : INSN3 | |
4236 | PC -> 0x08000003 : INSN4 | |
4237 | ||
4238 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4239 | from that point should hit B2 as below. Reading the PC when the | |
4240 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4241 | been de-executed already. | |
4242 | ||
4243 | B1 0x08000000 : INSN1 | |
4244 | B2 PC -> 0x08000001 : INSN2 | |
4245 | 0x08000002 : INSN3 | |
4246 | 0x08000003 : INSN4 | |
4247 | ||
4248 | We can't apply the same logic as for forward execution, because | |
4249 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4250 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4251 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4252 | behaviour. */ | |
4253 | if (execution_direction == EXEC_REVERSE) | |
4254 | return; | |
4255 | ||
1cf4d951 PA |
4256 | /* If the target can tell whether the thread hit a SW breakpoint, |
4257 | trust it. Targets that can tell also adjust the PC | |
4258 | themselves. */ | |
4259 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4260 | return; | |
4261 | ||
4262 | /* Note that relying on whether a breakpoint is planted in memory to | |
4263 | determine this can fail. E.g,. the breakpoint could have been | |
4264 | removed since. Or the thread could have been told to step an | |
4265 | instruction the size of a breakpoint instruction, and only | |
4266 | _after_ was a breakpoint inserted at its address. */ | |
4267 | ||
24a73cce UW |
4268 | /* If this target does not decrement the PC after breakpoints, then |
4269 | we have nothing to do. */ | |
00431a78 | 4270 | regcache = get_thread_regcache (thread); |
ac7936df | 4271 | gdbarch = regcache->arch (); |
118e6252 | 4272 | |
527a273a | 4273 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4274 | if (decr_pc == 0) |
24a73cce UW |
4275 | return; |
4276 | ||
8b86c959 | 4277 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4278 | |
8aad930b AC |
4279 | /* Find the location where (if we've hit a breakpoint) the |
4280 | breakpoint would be. */ | |
118e6252 | 4281 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4282 | |
1cf4d951 PA |
4283 | /* If the target can't tell whether a software breakpoint triggered, |
4284 | fallback to figuring it out based on breakpoints we think were | |
4285 | inserted in the target, and on whether the thread was stepped or | |
4286 | continued. */ | |
4287 | ||
1c5cfe86 PA |
4288 | /* Check whether there actually is a software breakpoint inserted at |
4289 | that location. | |
4290 | ||
4291 | If in non-stop mode, a race condition is possible where we've | |
4292 | removed a breakpoint, but stop events for that breakpoint were | |
4293 | already queued and arrive later. To suppress those spurious | |
4294 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4295 | and retire them after a number of stop events are reported. Note |
4296 | this is an heuristic and can thus get confused. The real fix is | |
4297 | to get the "stopped by SW BP and needs adjustment" info out of | |
4298 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4299 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4300 | || (target_is_non_stop_p () |
4301 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4302 | { |
07036511 | 4303 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4304 | |
8213266a | 4305 | if (record_full_is_used ()) |
07036511 TT |
4306 | restore_operation_disable.emplace |
4307 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4308 | |
1c0fdd0e UW |
4309 | /* When using hardware single-step, a SIGTRAP is reported for both |
4310 | a completed single-step and a software breakpoint. Need to | |
4311 | differentiate between the two, as the latter needs adjusting | |
4312 | but the former does not. | |
4313 | ||
4314 | The SIGTRAP can be due to a completed hardware single-step only if | |
4315 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4316 | - this thread is currently being stepped |
4317 | ||
4318 | If any of these events did not occur, we must have stopped due | |
4319 | to hitting a software breakpoint, and have to back up to the | |
4320 | breakpoint address. | |
4321 | ||
4322 | As a special case, we could have hardware single-stepped a | |
4323 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4324 | we also need to back up to the breakpoint address. */ | |
4325 | ||
d8dd4d5f PA |
4326 | if (thread_has_single_step_breakpoints_set (thread) |
4327 | || !currently_stepping (thread) | |
4328 | || (thread->stepped_breakpoint | |
4329 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4330 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4331 | } |
4fa8626c DJ |
4332 | } |
4333 | ||
edb3359d DJ |
4334 | static int |
4335 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4336 | { | |
4337 | for (frame = get_prev_frame (frame); | |
4338 | frame != NULL; | |
4339 | frame = get_prev_frame (frame)) | |
4340 | { | |
4341 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4342 | return 1; | |
4343 | if (get_frame_type (frame) != INLINE_FRAME) | |
4344 | break; | |
4345 | } | |
4346 | ||
4347 | return 0; | |
4348 | } | |
4349 | ||
4a4c04f1 BE |
4350 | /* Look for an inline frame that is marked for skip. |
4351 | If PREV_FRAME is TRUE start at the previous frame, | |
4352 | otherwise start at the current frame. Stop at the | |
4353 | first non-inline frame, or at the frame where the | |
4354 | step started. */ | |
4355 | ||
4356 | static bool | |
4357 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4358 | { | |
4359 | struct frame_info *frame = get_current_frame (); | |
4360 | ||
4361 | if (prev_frame) | |
4362 | frame = get_prev_frame (frame); | |
4363 | ||
4364 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4365 | { | |
4366 | const char *fn = NULL; | |
4367 | symtab_and_line sal; | |
4368 | struct symbol *sym; | |
4369 | ||
4370 | if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id)) | |
4371 | break; | |
4372 | if (get_frame_type (frame) != INLINE_FRAME) | |
4373 | break; | |
4374 | ||
4375 | sal = find_frame_sal (frame); | |
4376 | sym = get_frame_function (frame); | |
4377 | ||
4378 | if (sym != NULL) | |
4379 | fn = sym->print_name (); | |
4380 | ||
4381 | if (sal.line != 0 | |
4382 | && function_name_is_marked_for_skip (fn, sal)) | |
4383 | return true; | |
4384 | } | |
4385 | ||
4386 | return false; | |
4387 | } | |
4388 | ||
c65d6b55 PA |
4389 | /* If the event thread has the stop requested flag set, pretend it |
4390 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4391 | target_stop). */ | |
4392 | ||
4393 | static bool | |
4394 | handle_stop_requested (struct execution_control_state *ecs) | |
4395 | { | |
4396 | if (ecs->event_thread->stop_requested) | |
4397 | { | |
4398 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4399 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4400 | handle_signal_stop (ecs); | |
4401 | return true; | |
4402 | } | |
4403 | return false; | |
4404 | } | |
4405 | ||
a96d9b2e SDJ |
4406 | /* Auxiliary function that handles syscall entry/return events. |
4407 | It returns 1 if the inferior should keep going (and GDB | |
4408 | should ignore the event), or 0 if the event deserves to be | |
4409 | processed. */ | |
ca2163eb | 4410 | |
a96d9b2e | 4411 | static int |
ca2163eb | 4412 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4413 | { |
ca2163eb | 4414 | struct regcache *regcache; |
ca2163eb PA |
4415 | int syscall_number; |
4416 | ||
00431a78 | 4417 | context_switch (ecs); |
ca2163eb | 4418 | |
00431a78 | 4419 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4420 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4421 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4422 | |
a96d9b2e SDJ |
4423 | if (catch_syscall_enabled () > 0 |
4424 | && catching_syscall_number (syscall_number) > 0) | |
4425 | { | |
4426 | if (debug_infrun) | |
4427 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
4428 | syscall_number); | |
a96d9b2e | 4429 | |
16c381f0 | 4430 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4431 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4432 | ecs->event_thread->suspend.stop_pc, |
4433 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4434 | |
c65d6b55 PA |
4435 | if (handle_stop_requested (ecs)) |
4436 | return 0; | |
4437 | ||
ce12b012 | 4438 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4439 | { |
4440 | /* Catchpoint hit. */ | |
ca2163eb PA |
4441 | return 0; |
4442 | } | |
a96d9b2e | 4443 | } |
ca2163eb | 4444 | |
c65d6b55 PA |
4445 | if (handle_stop_requested (ecs)) |
4446 | return 0; | |
4447 | ||
ca2163eb | 4448 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb PA |
4449 | keep_going (ecs); |
4450 | return 1; | |
a96d9b2e SDJ |
4451 | } |
4452 | ||
7e324e48 GB |
4453 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4454 | ||
4455 | static void | |
4456 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4457 | struct execution_control_state *ecs) | |
4458 | { | |
4459 | if (!ecs->stop_func_filled_in) | |
4460 | { | |
98a617f8 KB |
4461 | const block *block; |
4462 | ||
7e324e48 GB |
4463 | /* Don't care about return value; stop_func_start and stop_func_name |
4464 | will both be 0 if it doesn't work. */ | |
98a617f8 KB |
4465 | find_pc_partial_function (ecs->event_thread->suspend.stop_pc, |
4466 | &ecs->stop_func_name, | |
4467 | &ecs->stop_func_start, | |
4468 | &ecs->stop_func_end, | |
4469 | &block); | |
4470 | ||
4471 | /* The call to find_pc_partial_function, above, will set | |
4472 | stop_func_start and stop_func_end to the start and end | |
4473 | of the range containing the stop pc. If this range | |
4474 | contains the entry pc for the block (which is always the | |
4475 | case for contiguous blocks), advance stop_func_start past | |
4476 | the function's start offset and entrypoint. Note that | |
4477 | stop_func_start is NOT advanced when in a range of a | |
4478 | non-contiguous block that does not contain the entry pc. */ | |
4479 | if (block != nullptr | |
4480 | && ecs->stop_func_start <= BLOCK_ENTRY_PC (block) | |
4481 | && BLOCK_ENTRY_PC (block) < ecs->stop_func_end) | |
4482 | { | |
4483 | ecs->stop_func_start | |
4484 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4485 | ||
4486 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4487 | ecs->stop_func_start | |
4488 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4489 | } | |
591a12a1 | 4490 | |
7e324e48 GB |
4491 | ecs->stop_func_filled_in = 1; |
4492 | } | |
4493 | } | |
4494 | ||
4f5d7f63 | 4495 | |
00431a78 | 4496 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4497 | |
4498 | static enum stop_kind | |
00431a78 | 4499 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4500 | { |
5b6d1e4f | 4501 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4502 | |
4503 | gdb_assert (inf != NULL); | |
4504 | return inf->control.stop_soon; | |
4505 | } | |
4506 | ||
5b6d1e4f PA |
4507 | /* Poll for one event out of the current target. Store the resulting |
4508 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4509 | |
4510 | static ptid_t | |
5b6d1e4f | 4511 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4512 | { |
4513 | ptid_t event_ptid; | |
372316f1 PA |
4514 | |
4515 | overlay_cache_invalid = 1; | |
4516 | ||
4517 | /* Flush target cache before starting to handle each event. | |
4518 | Target was running and cache could be stale. This is just a | |
4519 | heuristic. Running threads may modify target memory, but we | |
4520 | don't get any event. */ | |
4521 | target_dcache_invalidate (); | |
4522 | ||
4523 | if (deprecated_target_wait_hook) | |
5b6d1e4f | 4524 | event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 | 4525 | else |
5b6d1e4f | 4526 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4527 | |
4528 | if (debug_infrun) | |
5b6d1e4f | 4529 | print_target_wait_results (minus_one_ptid, event_ptid, ws); |
372316f1 PA |
4530 | |
4531 | return event_ptid; | |
4532 | } | |
4533 | ||
5b6d1e4f PA |
4534 | /* An event reported by wait_one. */ |
4535 | ||
4536 | struct wait_one_event | |
4537 | { | |
4538 | /* The target the event came out of. */ | |
4539 | process_stratum_target *target; | |
4540 | ||
4541 | /* The PTID the event was for. */ | |
4542 | ptid_t ptid; | |
4543 | ||
4544 | /* The waitstatus. */ | |
4545 | target_waitstatus ws; | |
4546 | }; | |
4547 | ||
4548 | /* Wait for one event out of any target. */ | |
4549 | ||
4550 | static wait_one_event | |
4551 | wait_one () | |
4552 | { | |
4553 | while (1) | |
4554 | { | |
4555 | for (inferior *inf : all_inferiors ()) | |
4556 | { | |
4557 | process_stratum_target *target = inf->process_target (); | |
4558 | if (target == NULL | |
4559 | || !target->is_async_p () | |
4560 | || !target->threads_executing) | |
4561 | continue; | |
4562 | ||
4563 | switch_to_inferior_no_thread (inf); | |
4564 | ||
4565 | wait_one_event event; | |
4566 | event.target = target; | |
4567 | event.ptid = poll_one_curr_target (&event.ws); | |
4568 | ||
4569 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4570 | { | |
4571 | /* If nothing is resumed, remove the target from the | |
4572 | event loop. */ | |
4573 | target_async (0); | |
4574 | } | |
4575 | else if (event.ws.kind != TARGET_WAITKIND_IGNORE) | |
4576 | return event; | |
4577 | } | |
4578 | ||
4579 | /* Block waiting for some event. */ | |
4580 | ||
4581 | fd_set readfds; | |
4582 | int nfds = 0; | |
4583 | ||
4584 | FD_ZERO (&readfds); | |
4585 | ||
4586 | for (inferior *inf : all_inferiors ()) | |
4587 | { | |
4588 | process_stratum_target *target = inf->process_target (); | |
4589 | if (target == NULL | |
4590 | || !target->is_async_p () | |
4591 | || !target->threads_executing) | |
4592 | continue; | |
4593 | ||
4594 | int fd = target->async_wait_fd (); | |
4595 | FD_SET (fd, &readfds); | |
4596 | if (nfds <= fd) | |
4597 | nfds = fd + 1; | |
4598 | } | |
4599 | ||
4600 | if (nfds == 0) | |
4601 | { | |
4602 | /* No waitable targets left. All must be stopped. */ | |
4603 | return {NULL, minus_one_ptid, {TARGET_WAITKIND_NO_RESUMED}}; | |
4604 | } | |
4605 | ||
4606 | QUIT; | |
4607 | ||
4608 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4609 | if (numfds < 0) | |
4610 | { | |
4611 | if (errno == EINTR) | |
4612 | continue; | |
4613 | else | |
4614 | perror_with_name ("interruptible_select"); | |
4615 | } | |
4616 | } | |
4617 | } | |
4618 | ||
372316f1 PA |
4619 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID |
4620 | instead of the current thread. */ | |
4621 | #define THREAD_STOPPED_BY(REASON) \ | |
4622 | static int \ | |
4623 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4624 | { \ | |
2989a365 | 4625 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); \ |
372316f1 PA |
4626 | inferior_ptid = ptid; \ |
4627 | \ | |
2989a365 | 4628 | return target_stopped_by_ ## REASON (); \ |
372316f1 PA |
4629 | } |
4630 | ||
4631 | /* Generate thread_stopped_by_watchpoint. */ | |
4632 | THREAD_STOPPED_BY (watchpoint) | |
4633 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4634 | THREAD_STOPPED_BY (sw_breakpoint) | |
4635 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4636 | THREAD_STOPPED_BY (hw_breakpoint) | |
4637 | ||
372316f1 PA |
4638 | /* Save the thread's event and stop reason to process it later. */ |
4639 | ||
4640 | static void | |
5b6d1e4f | 4641 | save_waitstatus (struct thread_info *tp, const target_waitstatus *ws) |
372316f1 | 4642 | { |
372316f1 PA |
4643 | if (debug_infrun) |
4644 | { | |
23fdd69e | 4645 | std::string statstr = target_waitstatus_to_string (ws); |
372316f1 | 4646 | |
372316f1 PA |
4647 | fprintf_unfiltered (gdb_stdlog, |
4648 | "infrun: saving status %s for %d.%ld.%ld\n", | |
23fdd69e | 4649 | statstr.c_str (), |
e99b03dc | 4650 | tp->ptid.pid (), |
e38504b3 | 4651 | tp->ptid.lwp (), |
cc6bcb54 | 4652 | tp->ptid.tid ()); |
372316f1 PA |
4653 | } |
4654 | ||
4655 | /* Record for later. */ | |
4656 | tp->suspend.waitstatus = *ws; | |
4657 | tp->suspend.waitstatus_pending_p = 1; | |
4658 | ||
00431a78 | 4659 | struct regcache *regcache = get_thread_regcache (tp); |
8b86c959 | 4660 | const address_space *aspace = regcache->aspace (); |
372316f1 PA |
4661 | |
4662 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4663 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4664 | { | |
4665 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4666 | ||
4667 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4668 | ||
4669 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4670 | { | |
4671 | tp->suspend.stop_reason | |
4672 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4673 | } | |
4674 | else if (target_supports_stopped_by_sw_breakpoint () | |
4675 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4676 | { | |
4677 | tp->suspend.stop_reason | |
4678 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4679 | } | |
4680 | else if (target_supports_stopped_by_hw_breakpoint () | |
4681 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4682 | { | |
4683 | tp->suspend.stop_reason | |
4684 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4685 | } | |
4686 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4687 | && hardware_breakpoint_inserted_here_p (aspace, | |
4688 | pc)) | |
4689 | { | |
4690 | tp->suspend.stop_reason | |
4691 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4692 | } | |
4693 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4694 | && software_breakpoint_inserted_here_p (aspace, | |
4695 | pc)) | |
4696 | { | |
4697 | tp->suspend.stop_reason | |
4698 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4699 | } | |
4700 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4701 | && currently_stepping (tp)) | |
4702 | { | |
4703 | tp->suspend.stop_reason | |
4704 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4705 | } | |
4706 | } | |
4707 | } | |
4708 | ||
6efcd9a8 | 4709 | /* See infrun.h. */ |
372316f1 | 4710 | |
6efcd9a8 | 4711 | void |
372316f1 PA |
4712 | stop_all_threads (void) |
4713 | { | |
4714 | /* We may need multiple passes to discover all threads. */ | |
4715 | int pass; | |
4716 | int iterations = 0; | |
372316f1 | 4717 | |
fbea99ea | 4718 | gdb_assert (target_is_non_stop_p ()); |
372316f1 PA |
4719 | |
4720 | if (debug_infrun) | |
4721 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n"); | |
4722 | ||
00431a78 | 4723 | scoped_restore_current_thread restore_thread; |
372316f1 | 4724 | |
65706a29 | 4725 | target_thread_events (1); |
9885e6bb | 4726 | SCOPE_EXIT { target_thread_events (0); }; |
65706a29 | 4727 | |
372316f1 PA |
4728 | /* Request threads to stop, and then wait for the stops. Because |
4729 | threads we already know about can spawn more threads while we're | |
4730 | trying to stop them, and we only learn about new threads when we | |
4731 | update the thread list, do this in a loop, and keep iterating | |
4732 | until two passes find no threads that need to be stopped. */ | |
4733 | for (pass = 0; pass < 2; pass++, iterations++) | |
4734 | { | |
4735 | if (debug_infrun) | |
4736 | fprintf_unfiltered (gdb_stdlog, | |
4737 | "infrun: stop_all_threads, pass=%d, " | |
4738 | "iterations=%d\n", pass, iterations); | |
4739 | while (1) | |
4740 | { | |
372316f1 | 4741 | int need_wait = 0; |
372316f1 PA |
4742 | |
4743 | update_thread_list (); | |
4744 | ||
4745 | /* Go through all threads looking for threads that we need | |
4746 | to tell the target to stop. */ | |
08036331 | 4747 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 PA |
4748 | { |
4749 | if (t->executing) | |
4750 | { | |
4751 | /* If already stopping, don't request a stop again. | |
4752 | We just haven't seen the notification yet. */ | |
4753 | if (!t->stop_requested) | |
4754 | { | |
4755 | if (debug_infrun) | |
4756 | fprintf_unfiltered (gdb_stdlog, | |
4757 | "infrun: %s executing, " | |
4758 | "need stop\n", | |
a068643d | 4759 | target_pid_to_str (t->ptid).c_str ()); |
f3f8ece4 | 4760 | switch_to_thread_no_regs (t); |
372316f1 PA |
4761 | target_stop (t->ptid); |
4762 | t->stop_requested = 1; | |
4763 | } | |
4764 | else | |
4765 | { | |
4766 | if (debug_infrun) | |
4767 | fprintf_unfiltered (gdb_stdlog, | |
4768 | "infrun: %s executing, " | |
4769 | "already stopping\n", | |
a068643d | 4770 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4771 | } |
4772 | ||
4773 | if (t->stop_requested) | |
4774 | need_wait = 1; | |
4775 | } | |
4776 | else | |
4777 | { | |
4778 | if (debug_infrun) | |
4779 | fprintf_unfiltered (gdb_stdlog, | |
4780 | "infrun: %s not executing\n", | |
a068643d | 4781 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4782 | |
4783 | /* The thread may be not executing, but still be | |
4784 | resumed with a pending status to process. */ | |
719546c4 | 4785 | t->resumed = false; |
372316f1 PA |
4786 | } |
4787 | } | |
4788 | ||
4789 | if (!need_wait) | |
4790 | break; | |
4791 | ||
4792 | /* If we find new threads on the second iteration, restart | |
4793 | over. We want to see two iterations in a row with all | |
4794 | threads stopped. */ | |
4795 | if (pass > 0) | |
4796 | pass = -1; | |
4797 | ||
5b6d1e4f PA |
4798 | wait_one_event event = wait_one (); |
4799 | ||
c29705b7 | 4800 | if (debug_infrun) |
372316f1 | 4801 | { |
c29705b7 PW |
4802 | fprintf_unfiltered (gdb_stdlog, |
4803 | "infrun: stop_all_threads %s %s\n", | |
5b6d1e4f PA |
4804 | target_waitstatus_to_string (&event.ws).c_str (), |
4805 | target_pid_to_str (event.ptid).c_str ()); | |
372316f1 | 4806 | } |
372316f1 | 4807 | |
5b6d1e4f PA |
4808 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED |
4809 | || event.ws.kind == TARGET_WAITKIND_THREAD_EXITED | |
4810 | || event.ws.kind == TARGET_WAITKIND_EXITED | |
4811 | || event.ws.kind == TARGET_WAITKIND_SIGNALLED) | |
c29705b7 PW |
4812 | { |
4813 | /* All resumed threads exited | |
4814 | or one thread/process exited/signalled. */ | |
372316f1 PA |
4815 | } |
4816 | else | |
4817 | { | |
5b6d1e4f | 4818 | thread_info *t = find_thread_ptid (event.target, event.ptid); |
372316f1 | 4819 | if (t == NULL) |
5b6d1e4f | 4820 | t = add_thread (event.target, event.ptid); |
372316f1 PA |
4821 | |
4822 | t->stop_requested = 0; | |
4823 | t->executing = 0; | |
719546c4 | 4824 | t->resumed = false; |
372316f1 PA |
4825 | t->control.may_range_step = 0; |
4826 | ||
6efcd9a8 PA |
4827 | /* This may be the first time we see the inferior report |
4828 | a stop. */ | |
5b6d1e4f | 4829 | inferior *inf = find_inferior_ptid (event.target, event.ptid); |
6efcd9a8 PA |
4830 | if (inf->needs_setup) |
4831 | { | |
4832 | switch_to_thread_no_regs (t); | |
4833 | setup_inferior (0); | |
4834 | } | |
4835 | ||
5b6d1e4f PA |
4836 | if (event.ws.kind == TARGET_WAITKIND_STOPPED |
4837 | && event.ws.value.sig == GDB_SIGNAL_0) | |
372316f1 PA |
4838 | { |
4839 | /* We caught the event that we intended to catch, so | |
4840 | there's no event pending. */ | |
4841 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4842 | t->suspend.waitstatus_pending_p = 0; | |
4843 | ||
00431a78 | 4844 | if (displaced_step_fixup (t, GDB_SIGNAL_0) < 0) |
372316f1 PA |
4845 | { |
4846 | /* Add it back to the step-over queue. */ | |
4847 | if (debug_infrun) | |
4848 | { | |
4849 | fprintf_unfiltered (gdb_stdlog, | |
4850 | "infrun: displaced-step of %s " | |
4851 | "canceled: adding back to the " | |
4852 | "step-over queue\n", | |
a068643d | 4853 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4854 | } |
4855 | t->control.trap_expected = 0; | |
4856 | thread_step_over_chain_enqueue (t); | |
4857 | } | |
4858 | } | |
4859 | else | |
4860 | { | |
4861 | enum gdb_signal sig; | |
4862 | struct regcache *regcache; | |
372316f1 PA |
4863 | |
4864 | if (debug_infrun) | |
4865 | { | |
5b6d1e4f | 4866 | std::string statstr = target_waitstatus_to_string (&event.ws); |
372316f1 | 4867 | |
372316f1 PA |
4868 | fprintf_unfiltered (gdb_stdlog, |
4869 | "infrun: target_wait %s, saving " | |
4870 | "status for %d.%ld.%ld\n", | |
23fdd69e | 4871 | statstr.c_str (), |
e99b03dc | 4872 | t->ptid.pid (), |
e38504b3 | 4873 | t->ptid.lwp (), |
cc6bcb54 | 4874 | t->ptid.tid ()); |
372316f1 PA |
4875 | } |
4876 | ||
4877 | /* Record for later. */ | |
5b6d1e4f | 4878 | save_waitstatus (t, &event.ws); |
372316f1 | 4879 | |
5b6d1e4f PA |
4880 | sig = (event.ws.kind == TARGET_WAITKIND_STOPPED |
4881 | ? event.ws.value.sig : GDB_SIGNAL_0); | |
372316f1 | 4882 | |
00431a78 | 4883 | if (displaced_step_fixup (t, sig) < 0) |
372316f1 PA |
4884 | { |
4885 | /* Add it back to the step-over queue. */ | |
4886 | t->control.trap_expected = 0; | |
4887 | thread_step_over_chain_enqueue (t); | |
4888 | } | |
4889 | ||
00431a78 | 4890 | regcache = get_thread_regcache (t); |
372316f1 PA |
4891 | t->suspend.stop_pc = regcache_read_pc (regcache); |
4892 | ||
4893 | if (debug_infrun) | |
4894 | { | |
4895 | fprintf_unfiltered (gdb_stdlog, | |
4896 | "infrun: saved stop_pc=%s for %s " | |
4897 | "(currently_stepping=%d)\n", | |
4898 | paddress (target_gdbarch (), | |
4899 | t->suspend.stop_pc), | |
a068643d | 4900 | target_pid_to_str (t->ptid).c_str (), |
372316f1 PA |
4901 | currently_stepping (t)); |
4902 | } | |
4903 | } | |
4904 | } | |
4905 | } | |
4906 | } | |
4907 | ||
372316f1 PA |
4908 | if (debug_infrun) |
4909 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n"); | |
4910 | } | |
4911 | ||
f4836ba9 PA |
4912 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4913 | ||
4914 | static int | |
4915 | handle_no_resumed (struct execution_control_state *ecs) | |
4916 | { | |
3b12939d | 4917 | if (target_can_async_p ()) |
f4836ba9 | 4918 | { |
3b12939d PA |
4919 | struct ui *ui; |
4920 | int any_sync = 0; | |
f4836ba9 | 4921 | |
3b12939d PA |
4922 | ALL_UIS (ui) |
4923 | { | |
4924 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4925 | { | |
4926 | any_sync = 1; | |
4927 | break; | |
4928 | } | |
4929 | } | |
4930 | if (!any_sync) | |
4931 | { | |
4932 | /* There were no unwaited-for children left in the target, but, | |
4933 | we're not synchronously waiting for events either. Just | |
4934 | ignore. */ | |
4935 | ||
4936 | if (debug_infrun) | |
4937 | fprintf_unfiltered (gdb_stdlog, | |
4938 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4939 | "(ignoring: bg)\n"); | |
4940 | prepare_to_wait (ecs); | |
4941 | return 1; | |
4942 | } | |
f4836ba9 PA |
4943 | } |
4944 | ||
4945 | /* Otherwise, if we were running a synchronous execution command, we | |
4946 | may need to cancel it and give the user back the terminal. | |
4947 | ||
4948 | In non-stop mode, the target can't tell whether we've already | |
4949 | consumed previous stop events, so it can end up sending us a | |
4950 | no-resumed event like so: | |
4951 | ||
4952 | #0 - thread 1 is left stopped | |
4953 | ||
4954 | #1 - thread 2 is resumed and hits breakpoint | |
4955 | -> TARGET_WAITKIND_STOPPED | |
4956 | ||
4957 | #2 - thread 3 is resumed and exits | |
4958 | this is the last resumed thread, so | |
4959 | -> TARGET_WAITKIND_NO_RESUMED | |
4960 | ||
4961 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4962 | it. | |
4963 | ||
4964 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4965 | thread 2 is now resumed, so the event should be ignored. | |
4966 | ||
4967 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4968 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4969 | event. But it could be that the event meant that thread 2 itself | |
4970 | (or whatever other thread was the last resumed thread) exited. | |
4971 | ||
4972 | To address this we refresh the thread list and check whether we | |
4973 | have resumed threads _now_. In the example above, this removes | |
4974 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4975 | ignore this event. If we find no thread resumed, then we cancel | |
4976 | the synchronous command show "no unwaited-for " to the user. */ | |
4977 | update_thread_list (); | |
4978 | ||
5b6d1e4f | 4979 | for (thread_info *thread : all_non_exited_threads (ecs->target)) |
f4836ba9 PA |
4980 | { |
4981 | if (thread->executing | |
4982 | || thread->suspend.waitstatus_pending_p) | |
4983 | { | |
4984 | /* There were no unwaited-for children left in the target at | |
4985 | some point, but there are now. Just ignore. */ | |
4986 | if (debug_infrun) | |
4987 | fprintf_unfiltered (gdb_stdlog, | |
4988 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4989 | "(ignoring: found resumed)\n"); | |
4990 | prepare_to_wait (ecs); | |
4991 | return 1; | |
4992 | } | |
4993 | } | |
4994 | ||
4995 | /* Note however that we may find no resumed thread because the whole | |
4996 | process exited meanwhile (thus updating the thread list results | |
4997 | in an empty thread list). In this case we know we'll be getting | |
4998 | a process exit event shortly. */ | |
5b6d1e4f | 4999 | for (inferior *inf : all_non_exited_inferiors (ecs->target)) |
f4836ba9 | 5000 | { |
08036331 | 5001 | thread_info *thread = any_live_thread_of_inferior (inf); |
f4836ba9 PA |
5002 | if (thread == NULL) |
5003 | { | |
5004 | if (debug_infrun) | |
5005 | fprintf_unfiltered (gdb_stdlog, | |
5006 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
5007 | "(expect process exit)\n"); | |
5008 | prepare_to_wait (ecs); | |
5009 | return 1; | |
5010 | } | |
5011 | } | |
5012 | ||
5013 | /* Go ahead and report the event. */ | |
5014 | return 0; | |
5015 | } | |
5016 | ||
05ba8510 PA |
5017 | /* Given an execution control state that has been freshly filled in by |
5018 | an event from the inferior, figure out what it means and take | |
5019 | appropriate action. | |
5020 | ||
5021 | The alternatives are: | |
5022 | ||
22bcd14b | 5023 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5024 | debugger. |
5025 | ||
5026 | 2) keep_going and return; to wait for the next event (set | |
5027 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5028 | once). */ | |
c906108c | 5029 | |
ec9499be | 5030 | static void |
595915c1 | 5031 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5032 | { |
595915c1 TT |
5033 | /* Make sure that all temporary struct value objects that were |
5034 | created during the handling of the event get deleted at the | |
5035 | end. */ | |
5036 | scoped_value_mark free_values; | |
5037 | ||
d6b48e9c PA |
5038 | enum stop_kind stop_soon; |
5039 | ||
c29705b7 PW |
5040 | if (debug_infrun) |
5041 | fprintf_unfiltered (gdb_stdlog, "infrun: handle_inferior_event %s\n", | |
5042 | target_waitstatus_to_string (&ecs->ws).c_str ()); | |
5043 | ||
28736962 PA |
5044 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
5045 | { | |
5046 | /* We had an event in the inferior, but we are not interested in | |
5047 | handling it at this level. The lower layers have already | |
5048 | done what needs to be done, if anything. | |
5049 | ||
5050 | One of the possible circumstances for this is when the | |
5051 | inferior produces output for the console. The inferior has | |
5052 | not stopped, and we are ignoring the event. Another possible | |
5053 | circumstance is any event which the lower level knows will be | |
5054 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5055 | prepare_to_wait (ecs); |
5056 | return; | |
5057 | } | |
5058 | ||
65706a29 PA |
5059 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
5060 | { | |
65706a29 PA |
5061 | prepare_to_wait (ecs); |
5062 | return; | |
5063 | } | |
5064 | ||
0e5bf2a8 | 5065 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5066 | && handle_no_resumed (ecs)) |
5067 | return; | |
0e5bf2a8 | 5068 | |
5b6d1e4f PA |
5069 | /* Cache the last target/ptid/waitstatus. */ |
5070 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5071 | |
ca005067 | 5072 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5073 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5074 | |
0e5bf2a8 PA |
5075 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
5076 | { | |
5077 | /* No unwaited-for children left. IOW, all resumed children | |
5078 | have exited. */ | |
0e5bf2a8 | 5079 | stop_print_frame = 0; |
22bcd14b | 5080 | stop_waiting (ecs); |
0e5bf2a8 PA |
5081 | return; |
5082 | } | |
5083 | ||
8c90c137 | 5084 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 5085 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 | 5086 | { |
5b6d1e4f | 5087 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5088 | /* If it's a new thread, add it to the thread database. */ |
5089 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5090 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5091 | |
5092 | /* Disable range stepping. If the next step request could use a | |
5093 | range, this will be end up re-enabled then. */ | |
5094 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5095 | } |
88ed393a JK |
5096 | |
5097 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 5098 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
5099 | |
5100 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5101 | reinit_frame_cache (); | |
5102 | ||
28736962 PA |
5103 | breakpoint_retire_moribund (); |
5104 | ||
2b009048 DJ |
5105 | /* First, distinguish signals caused by the debugger from signals |
5106 | that have to do with the program's own actions. Note that | |
5107 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5108 | on the operating system version. Here we detect when a SIGILL or | |
5109 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5110 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5111 | when we're trying to execute a breakpoint instruction on a | |
5112 | non-executable stack. This happens for call dummy breakpoints | |
5113 | for architectures like SPARC that place call dummies on the | |
5114 | stack. */ | |
2b009048 | 5115 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
5116 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
5117 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
5118 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 5119 | { |
00431a78 | 5120 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5121 | |
a01bda52 | 5122 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5123 | regcache_read_pc (regcache))) |
5124 | { | |
5125 | if (debug_infrun) | |
5126 | fprintf_unfiltered (gdb_stdlog, | |
5127 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 5128 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 5129 | } |
2b009048 DJ |
5130 | } |
5131 | ||
28736962 PA |
5132 | /* Mark the non-executing threads accordingly. In all-stop, all |
5133 | threads of all processes are stopped when we get any event | |
e1316e60 | 5134 | reported. In non-stop mode, only the event thread stops. */ |
372316f1 PA |
5135 | { |
5136 | ptid_t mark_ptid; | |
5137 | ||
fbea99ea | 5138 | if (!target_is_non_stop_p ()) |
372316f1 PA |
5139 | mark_ptid = minus_one_ptid; |
5140 | else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED | |
5141 | || ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
5142 | { | |
5143 | /* If we're handling a process exit in non-stop mode, even | |
5144 | though threads haven't been deleted yet, one would think | |
5145 | that there is nothing to do, as threads of the dead process | |
5146 | will be soon deleted, and threads of any other process were | |
5147 | left running. However, on some targets, threads survive a | |
5148 | process exit event. E.g., for the "checkpoint" command, | |
5149 | when the current checkpoint/fork exits, linux-fork.c | |
5150 | automatically switches to another fork from within | |
5151 | target_mourn_inferior, by associating the same | |
5152 | inferior/thread to another fork. We haven't mourned yet at | |
5153 | this point, but we must mark any threads left in the | |
5154 | process as not-executing so that finish_thread_state marks | |
5155 | them stopped (in the user's perspective) if/when we present | |
5156 | the stop to the user. */ | |
e99b03dc | 5157 | mark_ptid = ptid_t (ecs->ptid.pid ()); |
372316f1 PA |
5158 | } |
5159 | else | |
5160 | mark_ptid = ecs->ptid; | |
5161 | ||
719546c4 | 5162 | set_executing (ecs->target, mark_ptid, false); |
372316f1 PA |
5163 | |
5164 | /* Likewise the resumed flag. */ | |
719546c4 | 5165 | set_resumed (ecs->target, mark_ptid, false); |
372316f1 | 5166 | } |
8c90c137 | 5167 | |
488f131b JB |
5168 | switch (ecs->ws.kind) |
5169 | { | |
5170 | case TARGET_WAITKIND_LOADED: | |
00431a78 | 5171 | context_switch (ecs); |
b0f4b84b DJ |
5172 | /* Ignore gracefully during startup of the inferior, as it might |
5173 | be the shell which has just loaded some objects, otherwise | |
5174 | add the symbols for the newly loaded objects. Also ignore at | |
5175 | the beginning of an attach or remote session; we will query | |
5176 | the full list of libraries once the connection is | |
5177 | established. */ | |
4f5d7f63 | 5178 | |
00431a78 | 5179 | stop_soon = get_inferior_stop_soon (ecs); |
c0236d92 | 5180 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 5181 | { |
edcc5120 TT |
5182 | struct regcache *regcache; |
5183 | ||
00431a78 | 5184 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 TT |
5185 | |
5186 | handle_solib_event (); | |
5187 | ||
5188 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 5189 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
5190 | ecs->event_thread->suspend.stop_pc, |
5191 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 5192 | |
c65d6b55 PA |
5193 | if (handle_stop_requested (ecs)) |
5194 | return; | |
5195 | ||
ce12b012 | 5196 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
5197 | { |
5198 | /* A catchpoint triggered. */ | |
94c57d6a PA |
5199 | process_event_stop_test (ecs); |
5200 | return; | |
edcc5120 | 5201 | } |
488f131b | 5202 | |
b0f4b84b DJ |
5203 | /* If requested, stop when the dynamic linker notifies |
5204 | gdb of events. This allows the user to get control | |
5205 | and place breakpoints in initializer routines for | |
5206 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 5207 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
5208 | if (stop_on_solib_events) |
5209 | { | |
55409f9d DJ |
5210 | /* Make sure we print "Stopped due to solib-event" in |
5211 | normal_stop. */ | |
5212 | stop_print_frame = 1; | |
5213 | ||
22bcd14b | 5214 | stop_waiting (ecs); |
b0f4b84b DJ |
5215 | return; |
5216 | } | |
488f131b | 5217 | } |
b0f4b84b DJ |
5218 | |
5219 | /* If we are skipping through a shell, or through shared library | |
5220 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 5221 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
5222 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
5223 | { | |
74960c60 VP |
5224 | /* Loading of shared libraries might have changed breakpoint |
5225 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 5226 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 5227 | insert_breakpoints (); |
64ce06e4 | 5228 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
5229 | prepare_to_wait (ecs); |
5230 | return; | |
5231 | } | |
5232 | ||
5c09a2c5 PA |
5233 | /* But stop if we're attaching or setting up a remote |
5234 | connection. */ | |
5235 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5236 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5237 | { | |
5238 | if (debug_infrun) | |
5239 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 5240 | stop_waiting (ecs); |
5c09a2c5 PA |
5241 | return; |
5242 | } | |
5243 | ||
5244 | internal_error (__FILE__, __LINE__, | |
5245 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 5246 | |
488f131b | 5247 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5248 | if (handle_stop_requested (ecs)) |
5249 | return; | |
00431a78 | 5250 | context_switch (ecs); |
64ce06e4 | 5251 | resume (GDB_SIGNAL_0); |
488f131b JB |
5252 | prepare_to_wait (ecs); |
5253 | return; | |
c5aa993b | 5254 | |
65706a29 | 5255 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5256 | if (handle_stop_requested (ecs)) |
5257 | return; | |
00431a78 | 5258 | context_switch (ecs); |
65706a29 PA |
5259 | if (!switch_back_to_stepped_thread (ecs)) |
5260 | keep_going (ecs); | |
5261 | return; | |
5262 | ||
488f131b | 5263 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5264 | case TARGET_WAITKIND_SIGNALLED: |
fb66883a | 5265 | inferior_ptid = ecs->ptid; |
5b6d1e4f | 5266 | set_current_inferior (find_inferior_ptid (ecs->target, ecs->ptid)); |
6c95b8df PA |
5267 | set_current_program_space (current_inferior ()->pspace); |
5268 | handle_vfork_child_exec_or_exit (0); | |
223ffa71 | 5269 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5270 | |
0c557179 SDJ |
5271 | /* Clearing any previous state of convenience variables. */ |
5272 | clear_exit_convenience_vars (); | |
5273 | ||
940c3c06 PA |
5274 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5275 | { | |
5276 | /* Record the exit code in the convenience variable $_exitcode, so | |
5277 | that the user can inspect this again later. */ | |
5278 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5279 | (LONGEST) ecs->ws.value.integer); | |
5280 | ||
5281 | /* Also record this in the inferior itself. */ | |
5282 | current_inferior ()->has_exit_code = 1; | |
5283 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5284 | |
98eb56a4 PA |
5285 | /* Support the --return-child-result option. */ |
5286 | return_child_result_value = ecs->ws.value.integer; | |
5287 | ||
76727919 | 5288 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
5289 | } |
5290 | else | |
0c557179 | 5291 | { |
00431a78 | 5292 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5293 | |
5294 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5295 | { | |
5296 | /* Set the value of the internal variable $_exitsignal, | |
5297 | which holds the signal uncaught by the inferior. */ | |
5298 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5299 | gdbarch_gdb_signal_to_target (gdbarch, | |
5300 | ecs->ws.value.sig)); | |
5301 | } | |
5302 | else | |
5303 | { | |
5304 | /* We don't have access to the target's method used for | |
5305 | converting between signal numbers (GDB's internal | |
5306 | representation <-> target's representation). | |
5307 | Therefore, we cannot do a good job at displaying this | |
5308 | information to the user. It's better to just warn | |
5309 | her about it (if infrun debugging is enabled), and | |
5310 | give up. */ | |
5311 | if (debug_infrun) | |
5312 | fprintf_filtered (gdb_stdlog, _("\ | |
5313 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
5314 | } | |
5315 | ||
76727919 | 5316 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 5317 | } |
8cf64490 | 5318 | |
488f131b | 5319 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5320 | target_mourn_inferior (inferior_ptid); |
488f131b | 5321 | stop_print_frame = 0; |
22bcd14b | 5322 | stop_waiting (ecs); |
488f131b | 5323 | return; |
c5aa993b | 5324 | |
488f131b | 5325 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5326 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5327 | /* Check whether the inferior is displaced stepping. */ |
5328 | { | |
00431a78 | 5329 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5330 | struct gdbarch *gdbarch = regcache->arch (); |
e2d96639 YQ |
5331 | |
5332 | /* If checking displaced stepping is supported, and thread | |
5333 | ecs->ptid is displaced stepping. */ | |
00431a78 | 5334 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 YQ |
5335 | { |
5336 | struct inferior *parent_inf | |
5b6d1e4f | 5337 | = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 YQ |
5338 | struct regcache *child_regcache; |
5339 | CORE_ADDR parent_pc; | |
5340 | ||
d8d83535 SM |
5341 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) |
5342 | { | |
5343 | struct displaced_step_inferior_state *displaced | |
5344 | = get_displaced_stepping_state (parent_inf); | |
5345 | ||
5346 | /* Restore scratch pad for child process. */ | |
5347 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
5348 | } | |
5349 | ||
e2d96639 YQ |
5350 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, |
5351 | indicating that the displaced stepping of syscall instruction | |
5352 | has been done. Perform cleanup for parent process here. Note | |
5353 | that this operation also cleans up the child process for vfork, | |
5354 | because their pages are shared. */ | |
00431a78 | 5355 | displaced_step_fixup (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5356 | /* Start a new step-over in another thread if there's one |
5357 | that needs it. */ | |
5358 | start_step_over (); | |
e2d96639 | 5359 | |
e2d96639 YQ |
5360 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5361 | the child's PC is also within the scratchpad. Set the child's PC | |
5362 | to the parent's PC value, which has already been fixed up. | |
5363 | FIXME: we use the parent's aspace here, although we're touching | |
5364 | the child, because the child hasn't been added to the inferior | |
5365 | list yet at this point. */ | |
5366 | ||
5367 | child_regcache | |
5b6d1e4f PA |
5368 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
5369 | ecs->ws.value.related_pid, | |
e2d96639 YQ |
5370 | gdbarch, |
5371 | parent_inf->aspace); | |
5372 | /* Read PC value of parent process. */ | |
5373 | parent_pc = regcache_read_pc (regcache); | |
5374 | ||
5375 | if (debug_displaced) | |
5376 | fprintf_unfiltered (gdb_stdlog, | |
5377 | "displaced: write child pc from %s to %s\n", | |
5378 | paddress (gdbarch, | |
5379 | regcache_read_pc (child_regcache)), | |
5380 | paddress (gdbarch, parent_pc)); | |
5381 | ||
5382 | regcache_write_pc (child_regcache, parent_pc); | |
5383 | } | |
5384 | } | |
5385 | ||
00431a78 | 5386 | context_switch (ecs); |
5a2901d9 | 5387 | |
b242c3c2 PA |
5388 | /* Immediately detach breakpoints from the child before there's |
5389 | any chance of letting the user delete breakpoints from the | |
5390 | breakpoint lists. If we don't do this early, it's easy to | |
5391 | leave left over traps in the child, vis: "break foo; catch | |
5392 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5393 | the fork on the last `continue', and by that time the | |
5394 | breakpoint at "foo" is long gone from the breakpoint table. | |
5395 | If we vforked, then we don't need to unpatch here, since both | |
5396 | parent and child are sharing the same memory pages; we'll | |
5397 | need to unpatch at follow/detach time instead to be certain | |
5398 | that new breakpoints added between catchpoint hit time and | |
5399 | vfork follow are detached. */ | |
5400 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5401 | { | |
b242c3c2 PA |
5402 | /* This won't actually modify the breakpoint list, but will |
5403 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5404 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5405 | } |
5406 | ||
34b7e8a6 | 5407 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5408 | |
e58b0e63 PA |
5409 | /* In case the event is caught by a catchpoint, remember that |
5410 | the event is to be followed at the next resume of the thread, | |
5411 | and not immediately. */ | |
5412 | ecs->event_thread->pending_follow = ecs->ws; | |
5413 | ||
f2ffa92b PA |
5414 | ecs->event_thread->suspend.stop_pc |
5415 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 5416 | |
16c381f0 | 5417 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5418 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5419 | ecs->event_thread->suspend.stop_pc, |
5420 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 5421 | |
c65d6b55 PA |
5422 | if (handle_stop_requested (ecs)) |
5423 | return; | |
5424 | ||
ce12b012 PA |
5425 | /* If no catchpoint triggered for this, then keep going. Note |
5426 | that we're interested in knowing the bpstat actually causes a | |
5427 | stop, not just if it may explain the signal. Software | |
5428 | watchpoints, for example, always appear in the bpstat. */ | |
5429 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5430 | { |
e58b0e63 | 5431 | int should_resume; |
3e43a32a MS |
5432 | int follow_child |
5433 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 5434 | |
a493e3e2 | 5435 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 | 5436 | |
5b6d1e4f PA |
5437 | process_stratum_target *targ |
5438 | = ecs->event_thread->inf->process_target (); | |
5439 | ||
e58b0e63 PA |
5440 | should_resume = follow_fork (); |
5441 | ||
5b6d1e4f PA |
5442 | /* Note that one of these may be an invalid pointer, |
5443 | depending on detach_fork. */ | |
00431a78 | 5444 | thread_info *parent = ecs->event_thread; |
5b6d1e4f PA |
5445 | thread_info *child |
5446 | = find_thread_ptid (targ, ecs->ws.value.related_pid); | |
6c95b8df | 5447 | |
a2077e25 PA |
5448 | /* At this point, the parent is marked running, and the |
5449 | child is marked stopped. */ | |
5450 | ||
5451 | /* If not resuming the parent, mark it stopped. */ | |
5452 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5453 | parent->set_running (false); |
a2077e25 PA |
5454 | |
5455 | /* If resuming the child, mark it running. */ | |
5456 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5457 | child->set_running (true); |
a2077e25 | 5458 | |
6c95b8df | 5459 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5460 | if (!detach_fork && (non_stop |
5461 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5462 | { |
5463 | if (follow_child) | |
5464 | switch_to_thread (parent); | |
5465 | else | |
5466 | switch_to_thread (child); | |
5467 | ||
5468 | ecs->event_thread = inferior_thread (); | |
5469 | ecs->ptid = inferior_ptid; | |
5470 | keep_going (ecs); | |
5471 | } | |
5472 | ||
5473 | if (follow_child) | |
5474 | switch_to_thread (child); | |
5475 | else | |
5476 | switch_to_thread (parent); | |
5477 | ||
e58b0e63 PA |
5478 | ecs->event_thread = inferior_thread (); |
5479 | ecs->ptid = inferior_ptid; | |
5480 | ||
5481 | if (should_resume) | |
5482 | keep_going (ecs); | |
5483 | else | |
22bcd14b | 5484 | stop_waiting (ecs); |
04e68871 DJ |
5485 | return; |
5486 | } | |
94c57d6a PA |
5487 | process_event_stop_test (ecs); |
5488 | return; | |
488f131b | 5489 | |
6c95b8df PA |
5490 | case TARGET_WAITKIND_VFORK_DONE: |
5491 | /* Done with the shared memory region. Re-insert breakpoints in | |
5492 | the parent, and keep going. */ | |
5493 | ||
00431a78 | 5494 | context_switch (ecs); |
6c95b8df PA |
5495 | |
5496 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5497 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5498 | |
5499 | if (handle_stop_requested (ecs)) | |
5500 | return; | |
5501 | ||
6c95b8df PA |
5502 | /* This also takes care of reinserting breakpoints in the |
5503 | previously locked inferior. */ | |
5504 | keep_going (ecs); | |
5505 | return; | |
5506 | ||
488f131b | 5507 | case TARGET_WAITKIND_EXECD: |
488f131b | 5508 | |
cbd2b4e3 PA |
5509 | /* Note we can't read registers yet (the stop_pc), because we |
5510 | don't yet know the inferior's post-exec architecture. | |
5511 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5512 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5513 | |
6c95b8df PA |
5514 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5515 | handle_vfork_child_exec_or_exit (1); | |
5516 | ||
795e548f PA |
5517 | /* This causes the eventpoints and symbol table to be reset. |
5518 | Must do this now, before trying to determine whether to | |
5519 | stop. */ | |
71b43ef8 | 5520 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5521 | |
17d8546e DB |
5522 | /* In follow_exec we may have deleted the original thread and |
5523 | created a new one. Make sure that the event thread is the | |
5524 | execd thread for that case (this is a nop otherwise). */ | |
5525 | ecs->event_thread = inferior_thread (); | |
5526 | ||
f2ffa92b PA |
5527 | ecs->event_thread->suspend.stop_pc |
5528 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5529 | |
16c381f0 | 5530 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5531 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5532 | ecs->event_thread->suspend.stop_pc, |
5533 | ecs->event_thread, &ecs->ws); | |
795e548f | 5534 | |
71b43ef8 PA |
5535 | /* Note that this may be referenced from inside |
5536 | bpstat_stop_status above, through inferior_has_execd. */ | |
5537 | xfree (ecs->ws.value.execd_pathname); | |
5538 | ecs->ws.value.execd_pathname = NULL; | |
5539 | ||
c65d6b55 PA |
5540 | if (handle_stop_requested (ecs)) |
5541 | return; | |
5542 | ||
04e68871 | 5543 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5544 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5545 | { |
a493e3e2 | 5546 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5547 | keep_going (ecs); |
5548 | return; | |
5549 | } | |
94c57d6a PA |
5550 | process_event_stop_test (ecs); |
5551 | return; | |
488f131b | 5552 | |
b4dc5ffa MK |
5553 | /* Be careful not to try to gather much state about a thread |
5554 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5555 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5556 | /* Getting the current syscall number. */ |
94c57d6a PA |
5557 | if (handle_syscall_event (ecs) == 0) |
5558 | process_event_stop_test (ecs); | |
5559 | return; | |
c906108c | 5560 | |
488f131b JB |
5561 | /* Before examining the threads further, step this thread to |
5562 | get it entirely out of the syscall. (We get notice of the | |
5563 | event when the thread is just on the verge of exiting a | |
5564 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5565 | into user code.) */ |
488f131b | 5566 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5567 | if (handle_syscall_event (ecs) == 0) |
5568 | process_event_stop_test (ecs); | |
5569 | return; | |
c906108c | 5570 | |
488f131b | 5571 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5572 | handle_signal_stop (ecs); |
5573 | return; | |
c906108c | 5574 | |
b2175913 MS |
5575 | case TARGET_WAITKIND_NO_HISTORY: |
5576 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5577 | |
d1988021 | 5578 | /* Switch to the stopped thread. */ |
00431a78 | 5579 | context_switch (ecs); |
d1988021 MM |
5580 | if (debug_infrun) |
5581 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
5582 | ||
34b7e8a6 | 5583 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5584 | ecs->event_thread->suspend.stop_pc |
5585 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5586 | |
5587 | if (handle_stop_requested (ecs)) | |
5588 | return; | |
5589 | ||
76727919 | 5590 | gdb::observers::no_history.notify (); |
22bcd14b | 5591 | stop_waiting (ecs); |
b2175913 | 5592 | return; |
488f131b | 5593 | } |
4f5d7f63 PA |
5594 | } |
5595 | ||
372316f1 PA |
5596 | /* Restart threads back to what they were trying to do back when we |
5597 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5598 | ignored. */ | |
4d9d9d04 PA |
5599 | |
5600 | static void | |
372316f1 PA |
5601 | restart_threads (struct thread_info *event_thread) |
5602 | { | |
372316f1 PA |
5603 | /* In case the instruction just stepped spawned a new thread. */ |
5604 | update_thread_list (); | |
5605 | ||
08036331 | 5606 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5607 | { |
f3f8ece4 PA |
5608 | switch_to_thread_no_regs (tp); |
5609 | ||
372316f1 PA |
5610 | if (tp == event_thread) |
5611 | { | |
5612 | if (debug_infrun) | |
5613 | fprintf_unfiltered (gdb_stdlog, | |
5614 | "infrun: restart threads: " | |
5615 | "[%s] is event thread\n", | |
a068643d | 5616 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5617 | continue; |
5618 | } | |
5619 | ||
5620 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5621 | { | |
5622 | if (debug_infrun) | |
5623 | fprintf_unfiltered (gdb_stdlog, | |
5624 | "infrun: restart threads: " | |
5625 | "[%s] not meant to be running\n", | |
a068643d | 5626 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5627 | continue; |
5628 | } | |
5629 | ||
5630 | if (tp->resumed) | |
5631 | { | |
5632 | if (debug_infrun) | |
5633 | fprintf_unfiltered (gdb_stdlog, | |
5634 | "infrun: restart threads: [%s] resumed\n", | |
a068643d | 5635 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5636 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
5637 | continue; | |
5638 | } | |
5639 | ||
5640 | if (thread_is_in_step_over_chain (tp)) | |
5641 | { | |
5642 | if (debug_infrun) | |
5643 | fprintf_unfiltered (gdb_stdlog, | |
5644 | "infrun: restart threads: " | |
5645 | "[%s] needs step-over\n", | |
a068643d | 5646 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5647 | gdb_assert (!tp->resumed); |
5648 | continue; | |
5649 | } | |
5650 | ||
5651 | ||
5652 | if (tp->suspend.waitstatus_pending_p) | |
5653 | { | |
5654 | if (debug_infrun) | |
5655 | fprintf_unfiltered (gdb_stdlog, | |
5656 | "infrun: restart threads: " | |
5657 | "[%s] has pending status\n", | |
a068643d | 5658 | target_pid_to_str (tp->ptid).c_str ()); |
719546c4 | 5659 | tp->resumed = true; |
372316f1 PA |
5660 | continue; |
5661 | } | |
5662 | ||
c65d6b55 PA |
5663 | gdb_assert (!tp->stop_requested); |
5664 | ||
372316f1 PA |
5665 | /* If some thread needs to start a step-over at this point, it |
5666 | should still be in the step-over queue, and thus skipped | |
5667 | above. */ | |
5668 | if (thread_still_needs_step_over (tp)) | |
5669 | { | |
5670 | internal_error (__FILE__, __LINE__, | |
5671 | "thread [%s] needs a step-over, but not in " | |
5672 | "step-over queue\n", | |
a068643d | 5673 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5674 | } |
5675 | ||
5676 | if (currently_stepping (tp)) | |
5677 | { | |
5678 | if (debug_infrun) | |
5679 | fprintf_unfiltered (gdb_stdlog, | |
5680 | "infrun: restart threads: [%s] was stepping\n", | |
a068643d | 5681 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5682 | keep_going_stepped_thread (tp); |
5683 | } | |
5684 | else | |
5685 | { | |
5686 | struct execution_control_state ecss; | |
5687 | struct execution_control_state *ecs = &ecss; | |
5688 | ||
5689 | if (debug_infrun) | |
5690 | fprintf_unfiltered (gdb_stdlog, | |
5691 | "infrun: restart threads: [%s] continuing\n", | |
a068643d | 5692 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 | 5693 | reset_ecs (ecs, tp); |
00431a78 | 5694 | switch_to_thread (tp); |
372316f1 PA |
5695 | keep_going_pass_signal (ecs); |
5696 | } | |
5697 | } | |
5698 | } | |
5699 | ||
5700 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5701 | a pending waitstatus. */ | |
5702 | ||
5703 | static int | |
5704 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5705 | void *arg) | |
5706 | { | |
5707 | return (tp->resumed | |
5708 | && tp->suspend.waitstatus_pending_p); | |
5709 | } | |
5710 | ||
5711 | /* Called when we get an event that may finish an in-line or | |
5712 | out-of-line (displaced stepping) step-over started previously. | |
5713 | Return true if the event is processed and we should go back to the | |
5714 | event loop; false if the caller should continue processing the | |
5715 | event. */ | |
5716 | ||
5717 | static int | |
4d9d9d04 PA |
5718 | finish_step_over (struct execution_control_state *ecs) |
5719 | { | |
372316f1 PA |
5720 | int had_step_over_info; |
5721 | ||
00431a78 | 5722 | displaced_step_fixup (ecs->event_thread, |
4d9d9d04 PA |
5723 | ecs->event_thread->suspend.stop_signal); |
5724 | ||
372316f1 PA |
5725 | had_step_over_info = step_over_info_valid_p (); |
5726 | ||
5727 | if (had_step_over_info) | |
4d9d9d04 PA |
5728 | { |
5729 | /* If we're stepping over a breakpoint with all threads locked, | |
5730 | then only the thread that was stepped should be reporting | |
5731 | back an event. */ | |
5732 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5733 | ||
c65d6b55 | 5734 | clear_step_over_info (); |
4d9d9d04 PA |
5735 | } |
5736 | ||
fbea99ea | 5737 | if (!target_is_non_stop_p ()) |
372316f1 | 5738 | return 0; |
4d9d9d04 PA |
5739 | |
5740 | /* Start a new step-over in another thread if there's one that | |
5741 | needs it. */ | |
5742 | start_step_over (); | |
372316f1 PA |
5743 | |
5744 | /* If we were stepping over a breakpoint before, and haven't started | |
5745 | a new in-line step-over sequence, then restart all other threads | |
5746 | (except the event thread). We can't do this in all-stop, as then | |
5747 | e.g., we wouldn't be able to issue any other remote packet until | |
5748 | these other threads stop. */ | |
5749 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5750 | { | |
5751 | struct thread_info *pending; | |
5752 | ||
5753 | /* If we only have threads with pending statuses, the restart | |
5754 | below won't restart any thread and so nothing re-inserts the | |
5755 | breakpoint we just stepped over. But we need it inserted | |
5756 | when we later process the pending events, otherwise if | |
5757 | another thread has a pending event for this breakpoint too, | |
5758 | we'd discard its event (because the breakpoint that | |
5759 | originally caused the event was no longer inserted). */ | |
00431a78 | 5760 | context_switch (ecs); |
372316f1 PA |
5761 | insert_breakpoints (); |
5762 | ||
5763 | restart_threads (ecs->event_thread); | |
5764 | ||
5765 | /* If we have events pending, go through handle_inferior_event | |
5766 | again, picking up a pending event at random. This avoids | |
5767 | thread starvation. */ | |
5768 | ||
5769 | /* But not if we just stepped over a watchpoint in order to let | |
5770 | the instruction execute so we can evaluate its expression. | |
5771 | The set of watchpoints that triggered is recorded in the | |
5772 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5773 | If we processed another event first, that other event could | |
5774 | clobber this info. */ | |
5775 | if (ecs->event_thread->stepping_over_watchpoint) | |
5776 | return 0; | |
5777 | ||
5778 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5779 | NULL); | |
5780 | if (pending != NULL) | |
5781 | { | |
5782 | struct thread_info *tp = ecs->event_thread; | |
5783 | struct regcache *regcache; | |
5784 | ||
5785 | if (debug_infrun) | |
5786 | { | |
5787 | fprintf_unfiltered (gdb_stdlog, | |
5788 | "infrun: found resumed threads with " | |
5789 | "pending events, saving status\n"); | |
5790 | } | |
5791 | ||
5792 | gdb_assert (pending != tp); | |
5793 | ||
5794 | /* Record the event thread's event for later. */ | |
5795 | save_waitstatus (tp, &ecs->ws); | |
5796 | /* This was cleared early, by handle_inferior_event. Set it | |
5797 | so this pending event is considered by | |
5798 | do_target_wait. */ | |
719546c4 | 5799 | tp->resumed = true; |
372316f1 PA |
5800 | |
5801 | gdb_assert (!tp->executing); | |
5802 | ||
00431a78 | 5803 | regcache = get_thread_regcache (tp); |
372316f1 PA |
5804 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
5805 | ||
5806 | if (debug_infrun) | |
5807 | { | |
5808 | fprintf_unfiltered (gdb_stdlog, | |
5809 | "infrun: saved stop_pc=%s for %s " | |
5810 | "(currently_stepping=%d)\n", | |
5811 | paddress (target_gdbarch (), | |
5812 | tp->suspend.stop_pc), | |
a068643d | 5813 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
5814 | currently_stepping (tp)); |
5815 | } | |
5816 | ||
5817 | /* This in-line step-over finished; clear this so we won't | |
5818 | start a new one. This is what handle_signal_stop would | |
5819 | do, if we returned false. */ | |
5820 | tp->stepping_over_breakpoint = 0; | |
5821 | ||
5822 | /* Wake up the event loop again. */ | |
5823 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5824 | ||
5825 | prepare_to_wait (ecs); | |
5826 | return 1; | |
5827 | } | |
5828 | } | |
5829 | ||
5830 | return 0; | |
4d9d9d04 PA |
5831 | } |
5832 | ||
4f5d7f63 PA |
5833 | /* Come here when the program has stopped with a signal. */ |
5834 | ||
5835 | static void | |
5836 | handle_signal_stop (struct execution_control_state *ecs) | |
5837 | { | |
5838 | struct frame_info *frame; | |
5839 | struct gdbarch *gdbarch; | |
5840 | int stopped_by_watchpoint; | |
5841 | enum stop_kind stop_soon; | |
5842 | int random_signal; | |
c906108c | 5843 | |
f0407826 DE |
5844 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5845 | ||
c65d6b55 PA |
5846 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5847 | ||
f0407826 DE |
5848 | /* Do we need to clean up the state of a thread that has |
5849 | completed a displaced single-step? (Doing so usually affects | |
5850 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5851 | if (finish_step_over (ecs)) |
5852 | return; | |
f0407826 DE |
5853 | |
5854 | /* If we either finished a single-step or hit a breakpoint, but | |
5855 | the user wanted this thread to be stopped, pretend we got a | |
5856 | SIG0 (generic unsignaled stop). */ | |
5857 | if (ecs->event_thread->stop_requested | |
5858 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5859 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5860 | |
f2ffa92b PA |
5861 | ecs->event_thread->suspend.stop_pc |
5862 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 5863 | |
527159b7 | 5864 | if (debug_infrun) |
237fc4c9 | 5865 | { |
00431a78 | 5866 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 5867 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 5868 | |
f3f8ece4 | 5869 | switch_to_thread (ecs->event_thread); |
5af949e3 UW |
5870 | |
5871 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
b926417a | 5872 | paddress (reg_gdbarch, |
f2ffa92b | 5873 | ecs->event_thread->suspend.stop_pc)); |
d92524f1 | 5874 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5875 | { |
5876 | CORE_ADDR addr; | |
abbb1732 | 5877 | |
237fc4c9 PA |
5878 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
5879 | ||
8b88a78e | 5880 | if (target_stopped_data_address (current_top_target (), &addr)) |
237fc4c9 | 5881 | fprintf_unfiltered (gdb_stdlog, |
5af949e3 | 5882 | "infrun: stopped data address = %s\n", |
b926417a | 5883 | paddress (reg_gdbarch, addr)); |
237fc4c9 PA |
5884 | else |
5885 | fprintf_unfiltered (gdb_stdlog, | |
5886 | "infrun: (no data address available)\n"); | |
5887 | } | |
5888 | } | |
527159b7 | 5889 | |
36fa8042 PA |
5890 | /* This is originated from start_remote(), start_inferior() and |
5891 | shared libraries hook functions. */ | |
00431a78 | 5892 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
5893 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
5894 | { | |
00431a78 | 5895 | context_switch (ecs); |
36fa8042 PA |
5896 | if (debug_infrun) |
5897 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
5898 | stop_print_frame = 1; | |
22bcd14b | 5899 | stop_waiting (ecs); |
36fa8042 PA |
5900 | return; |
5901 | } | |
5902 | ||
36fa8042 PA |
5903 | /* This originates from attach_command(). We need to overwrite |
5904 | the stop_signal here, because some kernels don't ignore a | |
5905 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5906 | See more comments in inferior.h. On the other hand, if we | |
5907 | get a non-SIGSTOP, report it to the user - assume the backend | |
5908 | will handle the SIGSTOP if it should show up later. | |
5909 | ||
5910 | Also consider that the attach is complete when we see a | |
5911 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5912 | target extended-remote report it instead of a SIGSTOP | |
5913 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5914 | signal, so this is no exception. | |
5915 | ||
5916 | Also consider that the attach is complete when we see a | |
5917 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5918 | the target to stop all threads of the inferior, in case the | |
5919 | low level attach operation doesn't stop them implicitly. If | |
5920 | they weren't stopped implicitly, then the stub will report a | |
5921 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5922 | other than GDB's request. */ | |
5923 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5924 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5925 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5926 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5927 | { | |
5928 | stop_print_frame = 1; | |
22bcd14b | 5929 | stop_waiting (ecs); |
36fa8042 PA |
5930 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5931 | return; | |
5932 | } | |
5933 | ||
488f131b | 5934 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 | 5935 | so, then switch to that thread. */ |
d7e15655 | 5936 | if (ecs->ptid != inferior_ptid) |
488f131b | 5937 | { |
527159b7 | 5938 | if (debug_infrun) |
8a9de0e4 | 5939 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 5940 | |
00431a78 | 5941 | context_switch (ecs); |
c5aa993b | 5942 | |
9a4105ab | 5943 | if (deprecated_context_hook) |
00431a78 | 5944 | deprecated_context_hook (ecs->event_thread->global_num); |
488f131b | 5945 | } |
c906108c | 5946 | |
568d6575 UW |
5947 | /* At this point, get hold of the now-current thread's frame. */ |
5948 | frame = get_current_frame (); | |
5949 | gdbarch = get_frame_arch (frame); | |
5950 | ||
2adfaa28 | 5951 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5952 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5953 | { |
af48d08f | 5954 | struct regcache *regcache; |
af48d08f | 5955 | CORE_ADDR pc; |
2adfaa28 | 5956 | |
00431a78 | 5957 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
5958 | const address_space *aspace = regcache->aspace (); |
5959 | ||
af48d08f | 5960 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 5961 | |
af48d08f PA |
5962 | /* However, before doing so, if this single-step breakpoint was |
5963 | actually for another thread, set this thread up for moving | |
5964 | past it. */ | |
5965 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5966 | aspace, pc)) | |
5967 | { | |
5968 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
5969 | { |
5970 | if (debug_infrun) | |
5971 | { | |
5972 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 5973 | "infrun: [%s] hit another thread's " |
34b7e8a6 | 5974 | "single-step breakpoint\n", |
a068643d | 5975 | target_pid_to_str (ecs->ptid).c_str ()); |
2adfaa28 | 5976 | } |
af48d08f PA |
5977 | ecs->hit_singlestep_breakpoint = 1; |
5978 | } | |
5979 | } | |
5980 | else | |
5981 | { | |
5982 | if (debug_infrun) | |
5983 | { | |
5984 | fprintf_unfiltered (gdb_stdlog, | |
5985 | "infrun: [%s] hit its " | |
5986 | "single-step breakpoint\n", | |
a068643d | 5987 | target_pid_to_str (ecs->ptid).c_str ()); |
2adfaa28 PA |
5988 | } |
5989 | } | |
488f131b | 5990 | } |
af48d08f | 5991 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5992 | |
963f9c80 PA |
5993 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5994 | && ecs->event_thread->control.trap_expected | |
5995 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5996 | stopped_by_watchpoint = 0; |
5997 | else | |
5998 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5999 | ||
6000 | /* If necessary, step over this watchpoint. We'll be back to display | |
6001 | it in a moment. */ | |
6002 | if (stopped_by_watchpoint | |
d92524f1 | 6003 | && (target_have_steppable_watchpoint |
568d6575 | 6004 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 6005 | { |
488f131b JB |
6006 | /* At this point, we are stopped at an instruction which has |
6007 | attempted to write to a piece of memory under control of | |
6008 | a watchpoint. The instruction hasn't actually executed | |
6009 | yet. If we were to evaluate the watchpoint expression | |
6010 | now, we would get the old value, and therefore no change | |
6011 | would seem to have occurred. | |
6012 | ||
6013 | In order to make watchpoints work `right', we really need | |
6014 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
6015 | watchpoint expression. We do this by single-stepping the |
6016 | target. | |
6017 | ||
7f89fd65 | 6018 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
6019 | it. For example, the PA can (with some kernel cooperation) |
6020 | single step over a watchpoint without disabling the watchpoint. | |
6021 | ||
6022 | It is far more common to need to disable a watchpoint to step | |
6023 | the inferior over it. If we have non-steppable watchpoints, | |
6024 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
6025 | disable all watchpoints. |
6026 | ||
6027 | Any breakpoint at PC must also be stepped over -- if there's | |
6028 | one, it will have already triggered before the watchpoint | |
6029 | triggered, and we either already reported it to the user, or | |
6030 | it didn't cause a stop and we called keep_going. In either | |
6031 | case, if there was a breakpoint at PC, we must be trying to | |
6032 | step past it. */ | |
6033 | ecs->event_thread->stepping_over_watchpoint = 1; | |
6034 | keep_going (ecs); | |
488f131b JB |
6035 | return; |
6036 | } | |
6037 | ||
4e1c45ea | 6038 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 6039 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
6040 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
6041 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 6042 | stop_print_frame = 1; |
488f131b | 6043 | stopped_by_random_signal = 0; |
ddfe970e | 6044 | bpstat stop_chain = NULL; |
488f131b | 6045 | |
edb3359d DJ |
6046 | /* Hide inlined functions starting here, unless we just performed stepi or |
6047 | nexti. After stepi and nexti, always show the innermost frame (not any | |
6048 | inline function call sites). */ | |
16c381f0 | 6049 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 6050 | { |
00431a78 PA |
6051 | const address_space *aspace |
6052 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
6053 | |
6054 | /* skip_inline_frames is expensive, so we avoid it if we can | |
6055 | determine that the address is one where functions cannot have | |
6056 | been inlined. This improves performance with inferiors that | |
6057 | load a lot of shared libraries, because the solib event | |
6058 | breakpoint is defined as the address of a function (i.e. not | |
6059 | inline). Note that we have to check the previous PC as well | |
6060 | as the current one to catch cases when we have just | |
6061 | single-stepped off a breakpoint prior to reinstating it. | |
6062 | Note that we're assuming that the code we single-step to is | |
6063 | not inline, but that's not definitive: there's nothing | |
6064 | preventing the event breakpoint function from containing | |
6065 | inlined code, and the single-step ending up there. If the | |
6066 | user had set a breakpoint on that inlined code, the missing | |
6067 | skip_inline_frames call would break things. Fortunately | |
6068 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
6069 | if (!pc_at_non_inline_function (aspace, |
6070 | ecs->event_thread->suspend.stop_pc, | |
6071 | &ecs->ws) | |
a210c238 MR |
6072 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
6073 | && ecs->event_thread->control.trap_expected | |
6074 | && pc_at_non_inline_function (aspace, | |
6075 | ecs->event_thread->prev_pc, | |
09ac7c10 | 6076 | &ecs->ws))) |
1c5a993e | 6077 | { |
f2ffa92b PA |
6078 | stop_chain = build_bpstat_chain (aspace, |
6079 | ecs->event_thread->suspend.stop_pc, | |
6080 | &ecs->ws); | |
00431a78 | 6081 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
6082 | |
6083 | /* Re-fetch current thread's frame in case that invalidated | |
6084 | the frame cache. */ | |
6085 | frame = get_current_frame (); | |
6086 | gdbarch = get_frame_arch (frame); | |
6087 | } | |
0574c78f | 6088 | } |
edb3359d | 6089 | |
a493e3e2 | 6090 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 6091 | && ecs->event_thread->control.trap_expected |
568d6575 | 6092 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6093 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6094 | { |
b50d7442 | 6095 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6096 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6097 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6098 | with a delay slot. It needs to be stepped twice, once for |
6099 | the instruction and once for the delay slot. */ | |
6100 | int step_through_delay | |
568d6575 | 6101 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6102 | |
527159b7 | 6103 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 6104 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
6105 | if (ecs->event_thread->control.step_range_end == 0 |
6106 | && step_through_delay) | |
3352ef37 AC |
6107 | { |
6108 | /* The user issued a continue when stopped at a breakpoint. | |
6109 | Set up for another trap and get out of here. */ | |
4e1c45ea | 6110 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6111 | keep_going (ecs); |
6112 | return; | |
6113 | } | |
6114 | else if (step_through_delay) | |
6115 | { | |
6116 | /* The user issued a step when stopped at a breakpoint. | |
6117 | Maybe we should stop, maybe we should not - the delay | |
6118 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6119 | case, don't decide that here, just set |
6120 | ecs->stepping_over_breakpoint, making sure we | |
6121 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6122 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6123 | } |
6124 | } | |
6125 | ||
ab04a2af TT |
6126 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6127 | handles this event. */ | |
6128 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6129 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
6130 | ecs->event_thread->suspend.stop_pc, |
6131 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 6132 | |
ab04a2af TT |
6133 | /* Following in case break condition called a |
6134 | function. */ | |
6135 | stop_print_frame = 1; | |
73dd234f | 6136 | |
ab04a2af TT |
6137 | /* This is where we handle "moribund" watchpoints. Unlike |
6138 | software breakpoints traps, hardware watchpoint traps are | |
6139 | always distinguishable from random traps. If no high-level | |
6140 | watchpoint is associated with the reported stop data address | |
6141 | anymore, then the bpstat does not explain the signal --- | |
6142 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6143 | set. */ | |
6144 | ||
6145 | if (debug_infrun | |
6146 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 6147 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6148 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
6149 | && stopped_by_watchpoint) |
6150 | fprintf_unfiltered (gdb_stdlog, | |
6151 | "infrun: no user watchpoint explains " | |
6152 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 6153 | |
bac7d97b | 6154 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6155 | at one stage in the past included checks for an inferior |
6156 | function call's call dummy's return breakpoint. The original | |
6157 | comment, that went with the test, read: | |
03cebad2 | 6158 | |
ab04a2af TT |
6159 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6160 | another signal besides SIGTRAP, so check here as well as | |
6161 | above.'' | |
73dd234f | 6162 | |
ab04a2af TT |
6163 | If someone ever tries to get call dummys on a |
6164 | non-executable stack to work (where the target would stop | |
6165 | with something like a SIGSEGV), then those tests might need | |
6166 | to be re-instated. Given, however, that the tests were only | |
6167 | enabled when momentary breakpoints were not being used, I | |
6168 | suspect that it won't be the case. | |
488f131b | 6169 | |
ab04a2af TT |
6170 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6171 | be necessary for call dummies on a non-executable stack on | |
6172 | SPARC. */ | |
488f131b | 6173 | |
bac7d97b | 6174 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6175 | random_signal |
6176 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
6177 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 6178 | |
1cf4d951 PA |
6179 | /* Maybe this was a trap for a software breakpoint that has since |
6180 | been removed. */ | |
6181 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6182 | { | |
5133a315 LM |
6183 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
6184 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
6185 | { |
6186 | struct regcache *regcache; | |
6187 | int decr_pc; | |
6188 | ||
6189 | /* Re-adjust PC to what the program would see if GDB was not | |
6190 | debugging it. */ | |
00431a78 | 6191 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6192 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6193 | if (decr_pc != 0) |
6194 | { | |
07036511 TT |
6195 | gdb::optional<scoped_restore_tmpl<int>> |
6196 | restore_operation_disable; | |
1cf4d951 PA |
6197 | |
6198 | if (record_full_is_used ()) | |
07036511 TT |
6199 | restore_operation_disable.emplace |
6200 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6201 | |
f2ffa92b PA |
6202 | regcache_write_pc (regcache, |
6203 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
6204 | } |
6205 | } | |
6206 | else | |
6207 | { | |
6208 | /* A delayed software breakpoint event. Ignore the trap. */ | |
6209 | if (debug_infrun) | |
6210 | fprintf_unfiltered (gdb_stdlog, | |
6211 | "infrun: delayed software breakpoint " | |
6212 | "trap, ignoring\n"); | |
6213 | random_signal = 0; | |
6214 | } | |
6215 | } | |
6216 | ||
6217 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6218 | has since been removed. */ | |
6219 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6220 | { | |
6221 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
6222 | if (debug_infrun) | |
6223 | fprintf_unfiltered (gdb_stdlog, | |
6224 | "infrun: delayed hardware breakpoint/watchpoint " | |
6225 | "trap, ignoring\n"); | |
6226 | random_signal = 0; | |
6227 | } | |
6228 | ||
bac7d97b PA |
6229 | /* If not, perhaps stepping/nexting can. */ |
6230 | if (random_signal) | |
6231 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6232 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6233 | |
2adfaa28 PA |
6234 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6235 | thread. Single-step breakpoints are transparent to the | |
6236 | breakpoints module. */ | |
6237 | if (random_signal) | |
6238 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6239 | ||
bac7d97b PA |
6240 | /* No? Perhaps we got a moribund watchpoint. */ |
6241 | if (random_signal) | |
6242 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6243 | |
c65d6b55 PA |
6244 | /* Always stop if the user explicitly requested this thread to |
6245 | remain stopped. */ | |
6246 | if (ecs->event_thread->stop_requested) | |
6247 | { | |
6248 | random_signal = 1; | |
6249 | if (debug_infrun) | |
6250 | fprintf_unfiltered (gdb_stdlog, "infrun: user-requested stop\n"); | |
6251 | } | |
6252 | ||
488f131b JB |
6253 | /* For the program's own signals, act according to |
6254 | the signal handling tables. */ | |
6255 | ||
ce12b012 | 6256 | if (random_signal) |
488f131b JB |
6257 | { |
6258 | /* Signal not for debugging purposes. */ | |
5b6d1e4f | 6259 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
c9737c08 | 6260 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6261 | |
527159b7 | 6262 | if (debug_infrun) |
c9737c08 PA |
6263 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
6264 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6265 | |
488f131b JB |
6266 | stopped_by_random_signal = 1; |
6267 | ||
252fbfc8 PA |
6268 | /* Always stop on signals if we're either just gaining control |
6269 | of the program, or the user explicitly requested this thread | |
6270 | to remain stopped. */ | |
d6b48e9c | 6271 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6272 | || ecs->event_thread->stop_requested |
24291992 | 6273 | || (!inf->detaching |
16c381f0 | 6274 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 6275 | { |
22bcd14b | 6276 | stop_waiting (ecs); |
488f131b JB |
6277 | return; |
6278 | } | |
b57bacec PA |
6279 | |
6280 | /* Notify observers the signal has "handle print" set. Note we | |
6281 | returned early above if stopping; normal_stop handles the | |
6282 | printing in that case. */ | |
6283 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6284 | { | |
6285 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6286 | target_terminal::ours_for_output (); |
76727919 | 6287 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 6288 | target_terminal::inferior (); |
b57bacec | 6289 | } |
488f131b JB |
6290 | |
6291 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6292 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6293 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6294 | |
f2ffa92b | 6295 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 6296 | && ecs->event_thread->control.trap_expected |
8358c15c | 6297 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6298 | { |
6299 | /* We were just starting a new sequence, attempting to | |
6300 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6301 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6302 | of the stepping range so GDB needs to remember to, when |
6303 | the signal handler returns, resume stepping off that | |
6304 | breakpoint. */ | |
6305 | /* To simplify things, "continue" is forced to use the same | |
6306 | code paths as single-step - set a breakpoint at the | |
6307 | signal return address and then, once hit, step off that | |
6308 | breakpoint. */ | |
237fc4c9 PA |
6309 | if (debug_infrun) |
6310 | fprintf_unfiltered (gdb_stdlog, | |
6311 | "infrun: signal arrived while stepping over " | |
6312 | "breakpoint\n"); | |
d3169d93 | 6313 | |
2c03e5be | 6314 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6315 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6316 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6317 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6318 | |
6319 | /* If we were nexting/stepping some other thread, switch to | |
6320 | it, so that we don't continue it, losing control. */ | |
6321 | if (!switch_back_to_stepped_thread (ecs)) | |
6322 | keep_going (ecs); | |
9d799f85 | 6323 | return; |
68f53502 | 6324 | } |
9d799f85 | 6325 | |
e5f8a7cc | 6326 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
6327 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6328 | ecs->event_thread) | |
e5f8a7cc | 6329 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 6330 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6331 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6332 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6333 | { |
6334 | /* The inferior is about to take a signal that will take it | |
6335 | out of the single step range. Set a breakpoint at the | |
6336 | current PC (which is presumably where the signal handler | |
6337 | will eventually return) and then allow the inferior to | |
6338 | run free. | |
6339 | ||
6340 | Note that this is only needed for a signal delivered | |
6341 | while in the single-step range. Nested signals aren't a | |
6342 | problem as they eventually all return. */ | |
237fc4c9 PA |
6343 | if (debug_infrun) |
6344 | fprintf_unfiltered (gdb_stdlog, | |
6345 | "infrun: signal may take us out of " | |
6346 | "single-step range\n"); | |
6347 | ||
372316f1 | 6348 | clear_step_over_info (); |
2c03e5be | 6349 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6350 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6351 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6352 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6353 | keep_going (ecs); |
6354 | return; | |
d303a6c7 | 6355 | } |
9d799f85 | 6356 | |
85102364 | 6357 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6358 | when either there's a nested signal, or when there's a |
6359 | pending signal enabled just as the signal handler returns | |
6360 | (leaving the inferior at the step-resume-breakpoint without | |
6361 | actually executing it). Either way continue until the | |
6362 | breakpoint is really hit. */ | |
c447ac0b PA |
6363 | |
6364 | if (!switch_back_to_stepped_thread (ecs)) | |
6365 | { | |
6366 | if (debug_infrun) | |
6367 | fprintf_unfiltered (gdb_stdlog, | |
6368 | "infrun: random signal, keep going\n"); | |
6369 | ||
6370 | keep_going (ecs); | |
6371 | } | |
6372 | return; | |
488f131b | 6373 | } |
94c57d6a PA |
6374 | |
6375 | process_event_stop_test (ecs); | |
6376 | } | |
6377 | ||
6378 | /* Come here when we've got some debug event / signal we can explain | |
6379 | (IOW, not a random signal), and test whether it should cause a | |
6380 | stop, or whether we should resume the inferior (transparently). | |
6381 | E.g., could be a breakpoint whose condition evaluates false; we | |
6382 | could be still stepping within the line; etc. */ | |
6383 | ||
6384 | static void | |
6385 | process_event_stop_test (struct execution_control_state *ecs) | |
6386 | { | |
6387 | struct symtab_and_line stop_pc_sal; | |
6388 | struct frame_info *frame; | |
6389 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6390 | CORE_ADDR jmp_buf_pc; |
6391 | struct bpstat_what what; | |
94c57d6a | 6392 | |
cdaa5b73 | 6393 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6394 | |
cdaa5b73 PA |
6395 | frame = get_current_frame (); |
6396 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6397 | |
cdaa5b73 | 6398 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6399 | |
cdaa5b73 PA |
6400 | if (what.call_dummy) |
6401 | { | |
6402 | stop_stack_dummy = what.call_dummy; | |
6403 | } | |
186c406b | 6404 | |
243a9253 PA |
6405 | /* A few breakpoint types have callbacks associated (e.g., |
6406 | bp_jit_event). Run them now. */ | |
6407 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6408 | ||
cdaa5b73 PA |
6409 | /* If we hit an internal event that triggers symbol changes, the |
6410 | current frame will be invalidated within bpstat_what (e.g., if we | |
6411 | hit an internal solib event). Re-fetch it. */ | |
6412 | frame = get_current_frame (); | |
6413 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6414 | |
cdaa5b73 PA |
6415 | switch (what.main_action) |
6416 | { | |
6417 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6418 | /* If we hit the breakpoint at longjmp while stepping, we | |
6419 | install a momentary breakpoint at the target of the | |
6420 | jmp_buf. */ | |
186c406b | 6421 | |
cdaa5b73 PA |
6422 | if (debug_infrun) |
6423 | fprintf_unfiltered (gdb_stdlog, | |
6424 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 6425 | |
cdaa5b73 | 6426 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6427 | |
cdaa5b73 PA |
6428 | if (what.is_longjmp) |
6429 | { | |
6430 | struct value *arg_value; | |
6431 | ||
6432 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6433 | then use it to extract the arguments. The destination PC | |
6434 | is the third argument to the probe. */ | |
6435 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6436 | if (arg_value) | |
8fa0c4f8 AA |
6437 | { |
6438 | jmp_buf_pc = value_as_address (arg_value); | |
6439 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6440 | } | |
cdaa5b73 PA |
6441 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6442 | || !gdbarch_get_longjmp_target (gdbarch, | |
6443 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6444 | { |
cdaa5b73 PA |
6445 | if (debug_infrun) |
6446 | fprintf_unfiltered (gdb_stdlog, | |
6447 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
6448 | "(!gdbarch_get_longjmp_target)\n"); | |
6449 | keep_going (ecs); | |
6450 | return; | |
e2e4d78b | 6451 | } |
e2e4d78b | 6452 | |
cdaa5b73 PA |
6453 | /* Insert a breakpoint at resume address. */ |
6454 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6455 | } | |
6456 | else | |
6457 | check_exception_resume (ecs, frame); | |
6458 | keep_going (ecs); | |
6459 | return; | |
e81a37f7 | 6460 | |
cdaa5b73 PA |
6461 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6462 | { | |
6463 | struct frame_info *init_frame; | |
e81a37f7 | 6464 | |
cdaa5b73 | 6465 | /* There are several cases to consider. |
c906108c | 6466 | |
cdaa5b73 PA |
6467 | 1. The initiating frame no longer exists. In this case we |
6468 | must stop, because the exception or longjmp has gone too | |
6469 | far. | |
2c03e5be | 6470 | |
cdaa5b73 PA |
6471 | 2. The initiating frame exists, and is the same as the |
6472 | current frame. We stop, because the exception or longjmp | |
6473 | has been caught. | |
2c03e5be | 6474 | |
cdaa5b73 PA |
6475 | 3. The initiating frame exists and is different from the |
6476 | current frame. This means the exception or longjmp has | |
6477 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6478 | |
cdaa5b73 PA |
6479 | 4. longjmp breakpoint has been placed just to protect |
6480 | against stale dummy frames and user is not interested in | |
6481 | stopping around longjmps. */ | |
c5aa993b | 6482 | |
cdaa5b73 PA |
6483 | if (debug_infrun) |
6484 | fprintf_unfiltered (gdb_stdlog, | |
6485 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 6486 | |
cdaa5b73 PA |
6487 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6488 | != NULL); | |
6489 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6490 | |
cdaa5b73 PA |
6491 | if (what.is_longjmp) |
6492 | { | |
b67a2c6f | 6493 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6494 | |
cdaa5b73 | 6495 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6496 | { |
cdaa5b73 PA |
6497 | /* Case 4. */ |
6498 | keep_going (ecs); | |
6499 | return; | |
e5ef252a | 6500 | } |
cdaa5b73 | 6501 | } |
c5aa993b | 6502 | |
cdaa5b73 | 6503 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6504 | |
cdaa5b73 PA |
6505 | if (init_frame) |
6506 | { | |
6507 | struct frame_id current_id | |
6508 | = get_frame_id (get_current_frame ()); | |
6509 | if (frame_id_eq (current_id, | |
6510 | ecs->event_thread->initiating_frame)) | |
6511 | { | |
6512 | /* Case 2. Fall through. */ | |
6513 | } | |
6514 | else | |
6515 | { | |
6516 | /* Case 3. */ | |
6517 | keep_going (ecs); | |
6518 | return; | |
6519 | } | |
68f53502 | 6520 | } |
488f131b | 6521 | |
cdaa5b73 PA |
6522 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6523 | exists. */ | |
6524 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6525 | |
bdc36728 | 6526 | end_stepping_range (ecs); |
cdaa5b73 PA |
6527 | } |
6528 | return; | |
e5ef252a | 6529 | |
cdaa5b73 PA |
6530 | case BPSTAT_WHAT_SINGLE: |
6531 | if (debug_infrun) | |
6532 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
6533 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6534 | /* Still need to check other stuff, at least the case where we | |
6535 | are stepping and step out of the right range. */ | |
6536 | break; | |
e5ef252a | 6537 | |
cdaa5b73 PA |
6538 | case BPSTAT_WHAT_STEP_RESUME: |
6539 | if (debug_infrun) | |
6540 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 6541 | |
cdaa5b73 PA |
6542 | delete_step_resume_breakpoint (ecs->event_thread); |
6543 | if (ecs->event_thread->control.proceed_to_finish | |
6544 | && execution_direction == EXEC_REVERSE) | |
6545 | { | |
6546 | struct thread_info *tp = ecs->event_thread; | |
6547 | ||
6548 | /* We are finishing a function in reverse, and just hit the | |
6549 | step-resume breakpoint at the start address of the | |
6550 | function, and we're almost there -- just need to back up | |
6551 | by one more single-step, which should take us back to the | |
6552 | function call. */ | |
6553 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6554 | keep_going (ecs); | |
e5ef252a | 6555 | return; |
cdaa5b73 PA |
6556 | } |
6557 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6558 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6559 | && execution_direction == EXEC_REVERSE) |
6560 | { | |
6561 | /* We are stepping over a function call in reverse, and just | |
6562 | hit the step-resume breakpoint at the start address of | |
6563 | the function. Go back to single-stepping, which should | |
6564 | take us back to the function call. */ | |
6565 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6566 | keep_going (ecs); | |
6567 | return; | |
6568 | } | |
6569 | break; | |
e5ef252a | 6570 | |
cdaa5b73 PA |
6571 | case BPSTAT_WHAT_STOP_NOISY: |
6572 | if (debug_infrun) | |
6573 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
6574 | stop_print_frame = 1; | |
e5ef252a | 6575 | |
99619bea PA |
6576 | /* Assume the thread stopped for a breapoint. We'll still check |
6577 | whether a/the breakpoint is there when the thread is next | |
6578 | resumed. */ | |
6579 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6580 | |
22bcd14b | 6581 | stop_waiting (ecs); |
cdaa5b73 | 6582 | return; |
e5ef252a | 6583 | |
cdaa5b73 PA |
6584 | case BPSTAT_WHAT_STOP_SILENT: |
6585 | if (debug_infrun) | |
6586 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
6587 | stop_print_frame = 0; | |
e5ef252a | 6588 | |
99619bea PA |
6589 | /* Assume the thread stopped for a breapoint. We'll still check |
6590 | whether a/the breakpoint is there when the thread is next | |
6591 | resumed. */ | |
6592 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6593 | stop_waiting (ecs); |
cdaa5b73 PA |
6594 | return; |
6595 | ||
6596 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
6597 | if (debug_infrun) | |
6598 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
6599 | ||
6600 | delete_step_resume_breakpoint (ecs->event_thread); | |
6601 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6602 | { | |
6603 | /* Back when the step-resume breakpoint was inserted, we | |
6604 | were trying to single-step off a breakpoint. Go back to | |
6605 | doing that. */ | |
6606 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6607 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6608 | keep_going (ecs); | |
6609 | return; | |
e5ef252a | 6610 | } |
cdaa5b73 PA |
6611 | break; |
6612 | ||
6613 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6614 | break; | |
e5ef252a | 6615 | } |
c906108c | 6616 | |
af48d08f PA |
6617 | /* If we stepped a permanent breakpoint and we had a high priority |
6618 | step-resume breakpoint for the address we stepped, but we didn't | |
6619 | hit it, then we must have stepped into the signal handler. The | |
6620 | step-resume was only necessary to catch the case of _not_ | |
6621 | stepping into the handler, so delete it, and fall through to | |
6622 | checking whether the step finished. */ | |
6623 | if (ecs->event_thread->stepped_breakpoint) | |
6624 | { | |
6625 | struct breakpoint *sr_bp | |
6626 | = ecs->event_thread->control.step_resume_breakpoint; | |
6627 | ||
8d707a12 PA |
6628 | if (sr_bp != NULL |
6629 | && sr_bp->loc->permanent | |
af48d08f PA |
6630 | && sr_bp->type == bp_hp_step_resume |
6631 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6632 | { | |
6633 | if (debug_infrun) | |
6634 | fprintf_unfiltered (gdb_stdlog, | |
6635 | "infrun: stepped permanent breakpoint, stopped in " | |
6636 | "handler\n"); | |
6637 | delete_step_resume_breakpoint (ecs->event_thread); | |
6638 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6639 | } | |
6640 | } | |
6641 | ||
cdaa5b73 PA |
6642 | /* We come here if we hit a breakpoint but should not stop for it. |
6643 | Possibly we also were stepping and should stop for that. So fall | |
6644 | through and test for stepping. But, if not stepping, do not | |
6645 | stop. */ | |
c906108c | 6646 | |
a7212384 UW |
6647 | /* In all-stop mode, if we're currently stepping but have stopped in |
6648 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6649 | if (switch_back_to_stepped_thread (ecs)) |
6650 | return; | |
776f04fa | 6651 | |
8358c15c | 6652 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6653 | { |
527159b7 | 6654 | if (debug_infrun) |
d3169d93 DJ |
6655 | fprintf_unfiltered (gdb_stdlog, |
6656 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 6657 | |
488f131b JB |
6658 | /* Having a step-resume breakpoint overrides anything |
6659 | else having to do with stepping commands until | |
6660 | that breakpoint is reached. */ | |
488f131b JB |
6661 | keep_going (ecs); |
6662 | return; | |
6663 | } | |
c5aa993b | 6664 | |
16c381f0 | 6665 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6666 | { |
527159b7 | 6667 | if (debug_infrun) |
8a9de0e4 | 6668 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 6669 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6670 | keep_going (ecs); |
6671 | return; | |
6672 | } | |
c5aa993b | 6673 | |
4b7703ad JB |
6674 | /* Re-fetch current thread's frame in case the code above caused |
6675 | the frame cache to be re-initialized, making our FRAME variable | |
6676 | a dangling pointer. */ | |
6677 | frame = get_current_frame (); | |
628fe4e4 | 6678 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6679 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6680 | |
488f131b | 6681 | /* If stepping through a line, keep going if still within it. |
c906108c | 6682 | |
488f131b JB |
6683 | Note that step_range_end is the address of the first instruction |
6684 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6685 | within it! |
6686 | ||
6687 | Note also that during reverse execution, we may be stepping | |
6688 | through a function epilogue and therefore must detect when | |
6689 | the current-frame changes in the middle of a line. */ | |
6690 | ||
f2ffa92b PA |
6691 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6692 | ecs->event_thread) | |
31410e84 | 6693 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6694 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6695 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6696 | { |
527159b7 | 6697 | if (debug_infrun) |
5af949e3 UW |
6698 | fprintf_unfiltered |
6699 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
6700 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
6701 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6702 | |
c1e36e3e PA |
6703 | /* Tentatively re-enable range stepping; `resume' disables it if |
6704 | necessary (e.g., if we're stepping over a breakpoint or we | |
6705 | have software watchpoints). */ | |
6706 | ecs->event_thread->control.may_range_step = 1; | |
6707 | ||
b2175913 MS |
6708 | /* When stepping backward, stop at beginning of line range |
6709 | (unless it's the function entry point, in which case | |
6710 | keep going back to the call point). */ | |
f2ffa92b | 6711 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6712 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6713 | && stop_pc != ecs->stop_func_start |
6714 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6715 | end_stepping_range (ecs); |
b2175913 MS |
6716 | else |
6717 | keep_going (ecs); | |
6718 | ||
488f131b JB |
6719 | return; |
6720 | } | |
c5aa993b | 6721 | |
488f131b | 6722 | /* We stepped out of the stepping range. */ |
c906108c | 6723 | |
488f131b | 6724 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6725 | loader dynamic symbol resolution code... |
6726 | ||
6727 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6728 | time loader code and reach the callee's address. | |
6729 | ||
6730 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6731 | the runtime loader code is handled just like any other | |
6732 | undebuggable function call. Now we need only keep stepping | |
6733 | backward through the trampoline code, and that's handled further | |
6734 | down, so there is nothing for us to do here. */ | |
6735 | ||
6736 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6737 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6738 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6739 | { |
4c8c40e6 | 6740 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6741 | gdbarch_skip_solib_resolver (gdbarch, |
6742 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6743 | |
527159b7 | 6744 | if (debug_infrun) |
3e43a32a MS |
6745 | fprintf_unfiltered (gdb_stdlog, |
6746 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 6747 | |
488f131b JB |
6748 | if (pc_after_resolver) |
6749 | { | |
6750 | /* Set up a step-resume breakpoint at the address | |
6751 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6752 | symtab_and_line sr_sal; |
488f131b | 6753 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6754 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6755 | |
a6d9a66e UW |
6756 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6757 | sr_sal, null_frame_id); | |
c5aa993b | 6758 | } |
c906108c | 6759 | |
488f131b JB |
6760 | keep_going (ecs); |
6761 | return; | |
6762 | } | |
c906108c | 6763 | |
1d509aa6 MM |
6764 | /* Step through an indirect branch thunk. */ |
6765 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6766 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6767 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 MM |
6768 | { |
6769 | if (debug_infrun) | |
6770 | fprintf_unfiltered (gdb_stdlog, | |
6771 | "infrun: stepped into indirect branch thunk\n"); | |
6772 | keep_going (ecs); | |
6773 | return; | |
6774 | } | |
6775 | ||
16c381f0 JK |
6776 | if (ecs->event_thread->control.step_range_end != 1 |
6777 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6778 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6779 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6780 | { |
527159b7 | 6781 | if (debug_infrun) |
3e43a32a MS |
6782 | fprintf_unfiltered (gdb_stdlog, |
6783 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 6784 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6785 | a signal trampoline (either by a signal being delivered or by |
6786 | the signal handler returning). Just single-step until the | |
6787 | inferior leaves the trampoline (either by calling the handler | |
6788 | or returning). */ | |
488f131b JB |
6789 | keep_going (ecs); |
6790 | return; | |
6791 | } | |
c906108c | 6792 | |
14132e89 MR |
6793 | /* If we're in the return path from a shared library trampoline, |
6794 | we want to proceed through the trampoline when stepping. */ | |
6795 | /* macro/2012-04-25: This needs to come before the subroutine | |
6796 | call check below as on some targets return trampolines look | |
6797 | like subroutine calls (MIPS16 return thunks). */ | |
6798 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
6799 | ecs->event_thread->suspend.stop_pc, |
6800 | ecs->stop_func_name) | |
14132e89 MR |
6801 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6802 | { | |
6803 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
6804 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6805 | CORE_ADDR real_stop_pc | |
6806 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 MR |
6807 | |
6808 | if (debug_infrun) | |
6809 | fprintf_unfiltered (gdb_stdlog, | |
6810 | "infrun: stepped into solib return tramp\n"); | |
6811 | ||
6812 | /* Only proceed through if we know where it's going. */ | |
6813 | if (real_stop_pc) | |
6814 | { | |
6815 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6816 | symtab_and_line sr_sal; |
14132e89 MR |
6817 | sr_sal.pc = real_stop_pc; |
6818 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6819 | sr_sal.pspace = get_frame_program_space (frame); | |
6820 | ||
6821 | /* Do not specify what the fp should be when we stop since | |
6822 | on some machines the prologue is where the new fp value | |
6823 | is established. */ | |
6824 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6825 | sr_sal, null_frame_id); | |
6826 | ||
6827 | /* Restart without fiddling with the step ranges or | |
6828 | other state. */ | |
6829 | keep_going (ecs); | |
6830 | return; | |
6831 | } | |
6832 | } | |
6833 | ||
c17eaafe DJ |
6834 | /* Check for subroutine calls. The check for the current frame |
6835 | equalling the step ID is not necessary - the check of the | |
6836 | previous frame's ID is sufficient - but it is a common case and | |
6837 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6838 | |
6839 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6840 | being equal, so to get into this block, both the current and | |
6841 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6842 | /* The outer_frame_id check is a heuristic to detect stepping |
6843 | through startup code. If we step over an instruction which | |
6844 | sets the stack pointer from an invalid value to a valid value, | |
6845 | we may detect that as a subroutine call from the mythical | |
6846 | "outermost" function. This could be fixed by marking | |
6847 | outermost frames as !stack_p,code_p,special_p. Then the | |
6848 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6849 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6850 | for more. */ |
edb3359d | 6851 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6852 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6853 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6854 | ecs->event_thread->control.step_stack_frame_id) |
6855 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6856 | outer_frame_id) |
885eeb5b | 6857 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 6858 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 6859 | { |
f2ffa92b | 6860 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 6861 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6862 | |
527159b7 | 6863 | if (debug_infrun) |
8a9de0e4 | 6864 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 6865 | |
b7a084be | 6866 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6867 | { |
6868 | /* I presume that step_over_calls is only 0 when we're | |
6869 | supposed to be stepping at the assembly language level | |
6870 | ("stepi"). Just stop. */ | |
388a8562 | 6871 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6872 | end_stepping_range (ecs); |
95918acb AC |
6873 | return; |
6874 | } | |
8fb3e588 | 6875 | |
388a8562 MS |
6876 | /* Reverse stepping through solib trampolines. */ |
6877 | ||
6878 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6879 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6880 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6881 | || (ecs->stop_func_start == 0 | |
6882 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6883 | { | |
6884 | /* Any solib trampoline code can be handled in reverse | |
6885 | by simply continuing to single-step. We have already | |
6886 | executed the solib function (backwards), and a few | |
6887 | steps will take us back through the trampoline to the | |
6888 | caller. */ | |
6889 | keep_going (ecs); | |
6890 | return; | |
6891 | } | |
6892 | ||
16c381f0 | 6893 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6894 | { |
b2175913 MS |
6895 | /* We're doing a "next". |
6896 | ||
6897 | Normal (forward) execution: set a breakpoint at the | |
6898 | callee's return address (the address at which the caller | |
6899 | will resume). | |
6900 | ||
6901 | Reverse (backward) execution. set the step-resume | |
6902 | breakpoint at the start of the function that we just | |
6903 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6904 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6905 | |
6906 | if (execution_direction == EXEC_REVERSE) | |
6907 | { | |
acf9414f JK |
6908 | /* If we're already at the start of the function, we've either |
6909 | just stepped backward into a single instruction function, | |
6910 | or stepped back out of a signal handler to the first instruction | |
6911 | of the function. Just keep going, which will single-step back | |
6912 | to the caller. */ | |
58c48e72 | 6913 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6914 | { |
acf9414f | 6915 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6916 | symtab_and_line sr_sal; |
acf9414f JK |
6917 | sr_sal.pc = ecs->stop_func_start; |
6918 | sr_sal.pspace = get_frame_program_space (frame); | |
6919 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6920 | sr_sal, null_frame_id); | |
6921 | } | |
b2175913 MS |
6922 | } |
6923 | else | |
568d6575 | 6924 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6925 | |
8567c30f AC |
6926 | keep_going (ecs); |
6927 | return; | |
6928 | } | |
a53c66de | 6929 | |
95918acb | 6930 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6931 | calling routine and the real function), locate the real |
6932 | function. That's what tells us (a) whether we want to step | |
6933 | into it at all, and (b) what prologue we want to run to the | |
6934 | end of, if we do step into it. */ | |
568d6575 | 6935 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6936 | if (real_stop_pc == 0) |
568d6575 | 6937 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6938 | if (real_stop_pc != 0) |
6939 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6940 | |
db5f024e | 6941 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6942 | { |
51abb421 | 6943 | symtab_and_line sr_sal; |
1b2bfbb9 | 6944 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6945 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6946 | |
a6d9a66e UW |
6947 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6948 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6949 | keep_going (ecs); |
6950 | return; | |
1b2bfbb9 RC |
6951 | } |
6952 | ||
95918acb | 6953 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6954 | thinking of stepping into and the function isn't on the skip |
6955 | list, step into it. | |
95918acb | 6956 | |
8fb3e588 AC |
6957 | If there are several symtabs at that PC (e.g. with include |
6958 | files), just want to know whether *any* of them have line | |
6959 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6960 | { |
6961 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6962 | |
95918acb | 6963 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6964 | if (tmp_sal.line != 0 |
85817405 | 6965 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
6966 | tmp_sal) |
6967 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 6968 | { |
b2175913 | 6969 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6970 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6971 | else |
568d6575 | 6972 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6973 | return; |
6974 | } | |
6975 | } | |
6976 | ||
6977 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6978 | set, we stop the step so that the user has a chance to switch |
6979 | in assembly mode. */ | |
16c381f0 | 6980 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6981 | && step_stop_if_no_debug) |
95918acb | 6982 | { |
bdc36728 | 6983 | end_stepping_range (ecs); |
95918acb AC |
6984 | return; |
6985 | } | |
6986 | ||
b2175913 MS |
6987 | if (execution_direction == EXEC_REVERSE) |
6988 | { | |
acf9414f JK |
6989 | /* If we're already at the start of the function, we've either just |
6990 | stepped backward into a single instruction function without line | |
6991 | number info, or stepped back out of a signal handler to the first | |
6992 | instruction of the function without line number info. Just keep | |
6993 | going, which will single-step back to the caller. */ | |
6994 | if (ecs->stop_func_start != stop_pc) | |
6995 | { | |
6996 | /* Set a breakpoint at callee's start address. | |
6997 | From there we can step once and be back in the caller. */ | |
51abb421 | 6998 | symtab_and_line sr_sal; |
acf9414f JK |
6999 | sr_sal.pc = ecs->stop_func_start; |
7000 | sr_sal.pspace = get_frame_program_space (frame); | |
7001 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7002 | sr_sal, null_frame_id); | |
7003 | } | |
b2175913 MS |
7004 | } |
7005 | else | |
7006 | /* Set a breakpoint at callee's return address (the address | |
7007 | at which the caller will resume). */ | |
568d6575 | 7008 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7009 | |
95918acb | 7010 | keep_going (ecs); |
488f131b | 7011 | return; |
488f131b | 7012 | } |
c906108c | 7013 | |
fdd654f3 MS |
7014 | /* Reverse stepping through solib trampolines. */ |
7015 | ||
7016 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 7017 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 7018 | { |
f2ffa92b PA |
7019 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
7020 | ||
fdd654f3 MS |
7021 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
7022 | || (ecs->stop_func_start == 0 | |
7023 | && in_solib_dynsym_resolve_code (stop_pc))) | |
7024 | { | |
7025 | /* Any solib trampoline code can be handled in reverse | |
7026 | by simply continuing to single-step. We have already | |
7027 | executed the solib function (backwards), and a few | |
7028 | steps will take us back through the trampoline to the | |
7029 | caller. */ | |
7030 | keep_going (ecs); | |
7031 | return; | |
7032 | } | |
7033 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
7034 | { | |
7035 | /* Stepped backward into the solib dynsym resolver. | |
7036 | Set a breakpoint at its start and continue, then | |
7037 | one more step will take us out. */ | |
51abb421 | 7038 | symtab_and_line sr_sal; |
fdd654f3 | 7039 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 7040 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
7041 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7042 | sr_sal, null_frame_id); | |
7043 | keep_going (ecs); | |
7044 | return; | |
7045 | } | |
7046 | } | |
7047 | ||
8c95582d AB |
7048 | /* This always returns the sal for the inner-most frame when we are in a |
7049 | stack of inlined frames, even if GDB actually believes that it is in a | |
7050 | more outer frame. This is checked for below by calls to | |
7051 | inline_skipped_frames. */ | |
f2ffa92b | 7052 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 7053 | |
1b2bfbb9 RC |
7054 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
7055 | the trampoline processing logic, however, there are some trampolines | |
7056 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 7057 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 7058 | && ecs->stop_func_name == NULL |
2afb61aa | 7059 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 7060 | { |
527159b7 | 7061 | if (debug_infrun) |
3e43a32a MS |
7062 | fprintf_unfiltered (gdb_stdlog, |
7063 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 7064 | |
1b2bfbb9 | 7065 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
7066 | undebuggable function (where there is no debugging information |
7067 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
7068 | inferior stopped). Since we want to skip this kind of code, |
7069 | we keep going until the inferior returns from this | |
14e60db5 DJ |
7070 | function - unless the user has asked us not to (via |
7071 | set step-mode) or we no longer know how to get back | |
7072 | to the call site. */ | |
7073 | if (step_stop_if_no_debug | |
c7ce8faa | 7074 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
7075 | { |
7076 | /* If we have no line number and the step-stop-if-no-debug | |
7077 | is set, we stop the step so that the user has a chance to | |
7078 | switch in assembly mode. */ | |
bdc36728 | 7079 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7080 | return; |
7081 | } | |
7082 | else | |
7083 | { | |
7084 | /* Set a breakpoint at callee's return address (the address | |
7085 | at which the caller will resume). */ | |
568d6575 | 7086 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
7087 | keep_going (ecs); |
7088 | return; | |
7089 | } | |
7090 | } | |
7091 | ||
16c381f0 | 7092 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
7093 | { |
7094 | /* It is stepi or nexti. We always want to stop stepping after | |
7095 | one instruction. */ | |
527159b7 | 7096 | if (debug_infrun) |
8a9de0e4 | 7097 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 7098 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7099 | return; |
7100 | } | |
7101 | ||
2afb61aa | 7102 | if (stop_pc_sal.line == 0) |
488f131b JB |
7103 | { |
7104 | /* We have no line number information. That means to stop | |
7105 | stepping (does this always happen right after one instruction, | |
7106 | when we do "s" in a function with no line numbers, | |
7107 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 7108 | if (debug_infrun) |
8a9de0e4 | 7109 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 7110 | end_stepping_range (ecs); |
488f131b JB |
7111 | return; |
7112 | } | |
c906108c | 7113 | |
edb3359d DJ |
7114 | /* Look for "calls" to inlined functions, part one. If the inline |
7115 | frame machinery detected some skipped call sites, we have entered | |
7116 | a new inline function. */ | |
7117 | ||
7118 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7119 | ecs->event_thread->control.step_frame_id) |
00431a78 | 7120 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 7121 | { |
edb3359d DJ |
7122 | if (debug_infrun) |
7123 | fprintf_unfiltered (gdb_stdlog, | |
7124 | "infrun: stepped into inlined function\n"); | |
7125 | ||
51abb421 | 7126 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 7127 | |
16c381f0 | 7128 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
7129 | { |
7130 | /* For "step", we're going to stop. But if the call site | |
7131 | for this inlined function is on the same source line as | |
7132 | we were previously stepping, go down into the function | |
7133 | first. Otherwise stop at the call site. */ | |
7134 | ||
7135 | if (call_sal.line == ecs->event_thread->current_line | |
7136 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7137 | { |
7138 | step_into_inline_frame (ecs->event_thread); | |
7139 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7140 | { | |
7141 | keep_going (ecs); | |
7142 | return; | |
7143 | } | |
7144 | } | |
edb3359d | 7145 | |
bdc36728 | 7146 | end_stepping_range (ecs); |
edb3359d DJ |
7147 | return; |
7148 | } | |
7149 | else | |
7150 | { | |
7151 | /* For "next", we should stop at the call site if it is on a | |
7152 | different source line. Otherwise continue through the | |
7153 | inlined function. */ | |
7154 | if (call_sal.line == ecs->event_thread->current_line | |
7155 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7156 | keep_going (ecs); | |
7157 | else | |
bdc36728 | 7158 | end_stepping_range (ecs); |
edb3359d DJ |
7159 | return; |
7160 | } | |
7161 | } | |
7162 | ||
7163 | /* Look for "calls" to inlined functions, part two. If we are still | |
7164 | in the same real function we were stepping through, but we have | |
7165 | to go further up to find the exact frame ID, we are stepping | |
7166 | through a more inlined call beyond its call site. */ | |
7167 | ||
7168 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
7169 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7170 | ecs->event_thread->control.step_frame_id) |
edb3359d | 7171 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7172 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
7173 | { |
7174 | if (debug_infrun) | |
7175 | fprintf_unfiltered (gdb_stdlog, | |
7176 | "infrun: stepping through inlined function\n"); | |
7177 | ||
4a4c04f1 BE |
7178 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7179 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7180 | keep_going (ecs); |
7181 | else | |
bdc36728 | 7182 | end_stepping_range (ecs); |
edb3359d DJ |
7183 | return; |
7184 | } | |
7185 | ||
8c95582d | 7186 | bool refresh_step_info = true; |
f2ffa92b | 7187 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
7188 | && (ecs->event_thread->current_line != stop_pc_sal.line |
7189 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b | 7190 | { |
8c95582d AB |
7191 | if (stop_pc_sal.is_stmt) |
7192 | { | |
7193 | /* We are at the start of a different line. So stop. Note that | |
7194 | we don't stop if we step into the middle of a different line. | |
7195 | That is said to make things like for (;;) statements work | |
7196 | better. */ | |
7197 | if (debug_infrun) | |
7198 | fprintf_unfiltered (gdb_stdlog, | |
7199 | "infrun: stepped to a different line\n"); | |
7200 | end_stepping_range (ecs); | |
7201 | return; | |
7202 | } | |
7203 | else if (frame_id_eq (get_frame_id (get_current_frame ()), | |
7204 | ecs->event_thread->control.step_frame_id)) | |
7205 | { | |
7206 | /* We are at the start of a different line, however, this line is | |
7207 | not marked as a statement, and we have not changed frame. We | |
7208 | ignore this line table entry, and continue stepping forward, | |
7209 | looking for a better place to stop. */ | |
7210 | refresh_step_info = false; | |
7211 | if (debug_infrun) | |
7212 | fprintf_unfiltered (gdb_stdlog, | |
7213 | "infrun: stepped to a different line, but " | |
7214 | "it's not the start of a statement\n"); | |
7215 | } | |
488f131b | 7216 | } |
c906108c | 7217 | |
488f131b | 7218 | /* We aren't done stepping. |
c906108c | 7219 | |
488f131b JB |
7220 | Optimize by setting the stepping range to the line. |
7221 | (We might not be in the original line, but if we entered a | |
7222 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7223 | things like for(;;) statements work better.) |
7224 | ||
7225 | If we entered a SAL that indicates a non-statement line table entry, | |
7226 | then we update the stepping range, but we don't update the step info, | |
7227 | which includes things like the line number we are stepping away from. | |
7228 | This means we will stop when we find a line table entry that is marked | |
7229 | as is-statement, even if it matches the non-statement one we just | |
7230 | stepped into. */ | |
c906108c | 7231 | |
16c381f0 JK |
7232 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7233 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7234 | ecs->event_thread->control.may_range_step = 1; |
8c95582d AB |
7235 | if (refresh_step_info) |
7236 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7237 | |
527159b7 | 7238 | if (debug_infrun) |
8a9de0e4 | 7239 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 7240 | keep_going (ecs); |
104c1213 JM |
7241 | } |
7242 | ||
c447ac0b PA |
7243 | /* In all-stop mode, if we're currently stepping but have stopped in |
7244 | some other thread, we may need to switch back to the stepped | |
7245 | thread. Returns true we set the inferior running, false if we left | |
7246 | it stopped (and the event needs further processing). */ | |
7247 | ||
7248 | static int | |
7249 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
7250 | { | |
fbea99ea | 7251 | if (!target_is_non_stop_p ()) |
c447ac0b | 7252 | { |
99619bea PA |
7253 | struct thread_info *stepping_thread; |
7254 | ||
7255 | /* If any thread is blocked on some internal breakpoint, and we | |
7256 | simply need to step over that breakpoint to get it going | |
7257 | again, do that first. */ | |
7258 | ||
7259 | /* However, if we see an event for the stepping thread, then we | |
7260 | know all other threads have been moved past their breakpoints | |
7261 | already. Let the caller check whether the step is finished, | |
7262 | etc., before deciding to move it past a breakpoint. */ | |
7263 | if (ecs->event_thread->control.step_range_end != 0) | |
7264 | return 0; | |
7265 | ||
7266 | /* Check if the current thread is blocked on an incomplete | |
7267 | step-over, interrupted by a random signal. */ | |
7268 | if (ecs->event_thread->control.trap_expected | |
7269 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7270 | { |
99619bea PA |
7271 | if (debug_infrun) |
7272 | { | |
7273 | fprintf_unfiltered (gdb_stdlog, | |
7274 | "infrun: need to finish step-over of [%s]\n", | |
a068643d | 7275 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); |
99619bea PA |
7276 | } |
7277 | keep_going (ecs); | |
7278 | return 1; | |
7279 | } | |
2adfaa28 | 7280 | |
99619bea PA |
7281 | /* Check if the current thread is blocked by a single-step |
7282 | breakpoint of another thread. */ | |
7283 | if (ecs->hit_singlestep_breakpoint) | |
7284 | { | |
7285 | if (debug_infrun) | |
7286 | { | |
7287 | fprintf_unfiltered (gdb_stdlog, | |
7288 | "infrun: need to step [%s] over single-step " | |
7289 | "breakpoint\n", | |
a068643d | 7290 | target_pid_to_str (ecs->ptid).c_str ()); |
99619bea PA |
7291 | } |
7292 | keep_going (ecs); | |
7293 | return 1; | |
7294 | } | |
7295 | ||
4d9d9d04 PA |
7296 | /* If this thread needs yet another step-over (e.g., stepping |
7297 | through a delay slot), do it first before moving on to | |
7298 | another thread. */ | |
7299 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7300 | { | |
7301 | if (debug_infrun) | |
7302 | { | |
7303 | fprintf_unfiltered (gdb_stdlog, | |
7304 | "infrun: thread [%s] still needs step-over\n", | |
a068643d | 7305 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); |
4d9d9d04 PA |
7306 | } |
7307 | keep_going (ecs); | |
7308 | return 1; | |
7309 | } | |
70509625 | 7310 | |
483805cf PA |
7311 | /* If scheduler locking applies even if not stepping, there's no |
7312 | need to walk over threads. Above we've checked whether the | |
7313 | current thread is stepping. If some other thread not the | |
7314 | event thread is stepping, then it must be that scheduler | |
7315 | locking is not in effect. */ | |
856e7dd6 | 7316 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
7317 | return 0; |
7318 | ||
4d9d9d04 PA |
7319 | /* Otherwise, we no longer expect a trap in the current thread. |
7320 | Clear the trap_expected flag before switching back -- this is | |
7321 | what keep_going does as well, if we call it. */ | |
7322 | ecs->event_thread->control.trap_expected = 0; | |
7323 | ||
7324 | /* Likewise, clear the signal if it should not be passed. */ | |
7325 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7326 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7327 | ||
7328 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 7329 | step/next/etc. */ |
4d9d9d04 PA |
7330 | if (start_step_over ()) |
7331 | { | |
7332 | prepare_to_wait (ecs); | |
7333 | return 1; | |
7334 | } | |
7335 | ||
7336 | /* Look for the stepping/nexting thread. */ | |
483805cf | 7337 | stepping_thread = NULL; |
4d9d9d04 | 7338 | |
08036331 | 7339 | for (thread_info *tp : all_non_exited_threads ()) |
483805cf | 7340 | { |
f3f8ece4 PA |
7341 | switch_to_thread_no_regs (tp); |
7342 | ||
fbea99ea PA |
7343 | /* Ignore threads of processes the caller is not |
7344 | resuming. */ | |
483805cf | 7345 | if (!sched_multi |
5b6d1e4f PA |
7346 | && (tp->inf->process_target () != ecs->target |
7347 | || tp->inf->pid != ecs->ptid.pid ())) | |
483805cf PA |
7348 | continue; |
7349 | ||
7350 | /* When stepping over a breakpoint, we lock all threads | |
7351 | except the one that needs to move past the breakpoint. | |
7352 | If a non-event thread has this set, the "incomplete | |
7353 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
7354 | if (tp->control.trap_expected) |
7355 | { | |
7356 | internal_error (__FILE__, __LINE__, | |
7357 | "[%s] has inconsistent state: " | |
7358 | "trap_expected=%d\n", | |
a068643d | 7359 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
7360 | tp->control.trap_expected); |
7361 | } | |
483805cf PA |
7362 | |
7363 | /* Did we find the stepping thread? */ | |
7364 | if (tp->control.step_range_end) | |
7365 | { | |
7366 | /* Yep. There should only one though. */ | |
7367 | gdb_assert (stepping_thread == NULL); | |
7368 | ||
7369 | /* The event thread is handled at the top, before we | |
7370 | enter this loop. */ | |
7371 | gdb_assert (tp != ecs->event_thread); | |
7372 | ||
7373 | /* If some thread other than the event thread is | |
7374 | stepping, then scheduler locking can't be in effect, | |
7375 | otherwise we wouldn't have resumed the current event | |
7376 | thread in the first place. */ | |
856e7dd6 | 7377 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
7378 | |
7379 | stepping_thread = tp; | |
7380 | } | |
99619bea PA |
7381 | } |
7382 | ||
483805cf | 7383 | if (stepping_thread != NULL) |
99619bea | 7384 | { |
c447ac0b PA |
7385 | if (debug_infrun) |
7386 | fprintf_unfiltered (gdb_stdlog, | |
7387 | "infrun: switching back to stepped thread\n"); | |
7388 | ||
2ac7589c PA |
7389 | if (keep_going_stepped_thread (stepping_thread)) |
7390 | { | |
7391 | prepare_to_wait (ecs); | |
7392 | return 1; | |
7393 | } | |
7394 | } | |
f3f8ece4 PA |
7395 | |
7396 | switch_to_thread (ecs->event_thread); | |
2ac7589c | 7397 | } |
2adfaa28 | 7398 | |
2ac7589c PA |
7399 | return 0; |
7400 | } | |
2adfaa28 | 7401 | |
2ac7589c PA |
7402 | /* Set a previously stepped thread back to stepping. Returns true on |
7403 | success, false if the resume is not possible (e.g., the thread | |
7404 | vanished). */ | |
7405 | ||
7406 | static int | |
7407 | keep_going_stepped_thread (struct thread_info *tp) | |
7408 | { | |
7409 | struct frame_info *frame; | |
2ac7589c PA |
7410 | struct execution_control_state ecss; |
7411 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7412 | |
2ac7589c PA |
7413 | /* If the stepping thread exited, then don't try to switch back and |
7414 | resume it, which could fail in several different ways depending | |
7415 | on the target. Instead, just keep going. | |
2adfaa28 | 7416 | |
2ac7589c PA |
7417 | We can find a stepping dead thread in the thread list in two |
7418 | cases: | |
2adfaa28 | 7419 | |
2ac7589c PA |
7420 | - The target supports thread exit events, and when the target |
7421 | tries to delete the thread from the thread list, inferior_ptid | |
7422 | pointed at the exiting thread. In such case, calling | |
7423 | delete_thread does not really remove the thread from the list; | |
7424 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7425 | |
2ac7589c PA |
7426 | - The target's debug interface does not support thread exit |
7427 | events, and so we have no idea whatsoever if the previously | |
7428 | stepping thread is still alive. For that reason, we need to | |
7429 | synchronously query the target now. */ | |
2adfaa28 | 7430 | |
00431a78 | 7431 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c PA |
7432 | { |
7433 | if (debug_infrun) | |
7434 | fprintf_unfiltered (gdb_stdlog, | |
7435 | "infrun: not resuming previously " | |
7436 | "stepped thread, it has vanished\n"); | |
7437 | ||
00431a78 | 7438 | delete_thread (tp); |
2ac7589c | 7439 | return 0; |
c447ac0b | 7440 | } |
2ac7589c PA |
7441 | |
7442 | if (debug_infrun) | |
7443 | fprintf_unfiltered (gdb_stdlog, | |
7444 | "infrun: resuming previously stepped thread\n"); | |
7445 | ||
7446 | reset_ecs (ecs, tp); | |
00431a78 | 7447 | switch_to_thread (tp); |
2ac7589c | 7448 | |
f2ffa92b | 7449 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 7450 | frame = get_current_frame (); |
2ac7589c PA |
7451 | |
7452 | /* If the PC of the thread we were trying to single-step has | |
7453 | changed, then that thread has trapped or been signaled, but the | |
7454 | event has not been reported to GDB yet. Re-poll the target | |
7455 | looking for this particular thread's event (i.e. temporarily | |
7456 | enable schedlock) by: | |
7457 | ||
7458 | - setting a break at the current PC | |
7459 | - resuming that particular thread, only (by setting trap | |
7460 | expected) | |
7461 | ||
7462 | This prevents us continuously moving the single-step breakpoint | |
7463 | forward, one instruction at a time, overstepping. */ | |
7464 | ||
f2ffa92b | 7465 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
7466 | { |
7467 | ptid_t resume_ptid; | |
7468 | ||
7469 | if (debug_infrun) | |
7470 | fprintf_unfiltered (gdb_stdlog, | |
7471 | "infrun: expected thread advanced also (%s -> %s)\n", | |
7472 | paddress (target_gdbarch (), tp->prev_pc), | |
f2ffa92b | 7473 | paddress (target_gdbarch (), tp->suspend.stop_pc)); |
2ac7589c PA |
7474 | |
7475 | /* Clear the info of the previous step-over, as it's no longer | |
7476 | valid (if the thread was trying to step over a breakpoint, it | |
7477 | has already succeeded). It's what keep_going would do too, | |
7478 | if we called it. Do this before trying to insert the sss | |
7479 | breakpoint, otherwise if we were previously trying to step | |
7480 | over this exact address in another thread, the breakpoint is | |
7481 | skipped. */ | |
7482 | clear_step_over_info (); | |
7483 | tp->control.trap_expected = 0; | |
7484 | ||
7485 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7486 | get_frame_address_space (frame), | |
f2ffa92b | 7487 | tp->suspend.stop_pc); |
2ac7589c | 7488 | |
719546c4 | 7489 | tp->resumed = true; |
fbea99ea | 7490 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7491 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7492 | } | |
7493 | else | |
7494 | { | |
7495 | if (debug_infrun) | |
7496 | fprintf_unfiltered (gdb_stdlog, | |
7497 | "infrun: expected thread still hasn't advanced\n"); | |
7498 | ||
7499 | keep_going_pass_signal (ecs); | |
7500 | } | |
7501 | return 1; | |
c447ac0b PA |
7502 | } |
7503 | ||
8b061563 PA |
7504 | /* Is thread TP in the middle of (software or hardware) |
7505 | single-stepping? (Note the result of this function must never be | |
7506 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7507 | |
a289b8f6 | 7508 | static int |
b3444185 | 7509 | currently_stepping (struct thread_info *tp) |
a7212384 | 7510 | { |
8358c15c JK |
7511 | return ((tp->control.step_range_end |
7512 | && tp->control.step_resume_breakpoint == NULL) | |
7513 | || tp->control.trap_expected | |
af48d08f | 7514 | || tp->stepped_breakpoint |
8358c15c | 7515 | || bpstat_should_step ()); |
a7212384 UW |
7516 | } |
7517 | ||
b2175913 MS |
7518 | /* Inferior has stepped into a subroutine call with source code that |
7519 | we should not step over. Do step to the first line of code in | |
7520 | it. */ | |
c2c6d25f JM |
7521 | |
7522 | static void | |
568d6575 UW |
7523 | handle_step_into_function (struct gdbarch *gdbarch, |
7524 | struct execution_control_state *ecs) | |
c2c6d25f | 7525 | { |
7e324e48 GB |
7526 | fill_in_stop_func (gdbarch, ecs); |
7527 | ||
f2ffa92b PA |
7528 | compunit_symtab *cust |
7529 | = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); | |
43f3e411 | 7530 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7531 | ecs->stop_func_start |
7532 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7533 | |
51abb421 | 7534 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7535 | /* Use the step_resume_break to step until the end of the prologue, |
7536 | even if that involves jumps (as it seems to on the vax under | |
7537 | 4.2). */ | |
7538 | /* If the prologue ends in the middle of a source line, continue to | |
7539 | the end of that source line (if it is still within the function). | |
7540 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7541 | if (stop_func_sal.end |
7542 | && stop_func_sal.pc != ecs->stop_func_start | |
7543 | && stop_func_sal.end < ecs->stop_func_end) | |
7544 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7545 | |
2dbd5e30 KB |
7546 | /* Architectures which require breakpoint adjustment might not be able |
7547 | to place a breakpoint at the computed address. If so, the test | |
7548 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7549 | ecs->stop_func_start to an address at which a breakpoint may be | |
7550 | legitimately placed. | |
8fb3e588 | 7551 | |
2dbd5e30 KB |
7552 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7553 | made, GDB will enter an infinite loop when stepping through | |
7554 | optimized code consisting of VLIW instructions which contain | |
7555 | subinstructions corresponding to different source lines. On | |
7556 | FR-V, it's not permitted to place a breakpoint on any but the | |
7557 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7558 | set, GDB will adjust the breakpoint address to the beginning of | |
7559 | the VLIW instruction. Thus, we need to make the corresponding | |
7560 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7561 | |
568d6575 | 7562 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7563 | { |
7564 | ecs->stop_func_start | |
568d6575 | 7565 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7566 | ecs->stop_func_start); |
2dbd5e30 KB |
7567 | } |
7568 | ||
f2ffa92b | 7569 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7570 | { |
7571 | /* We are already there: stop now. */ | |
bdc36728 | 7572 | end_stepping_range (ecs); |
c2c6d25f JM |
7573 | return; |
7574 | } | |
7575 | else | |
7576 | { | |
7577 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7578 | symtab_and_line sr_sal; |
c2c6d25f JM |
7579 | sr_sal.pc = ecs->stop_func_start; |
7580 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7581 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7582 | |
c2c6d25f | 7583 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7584 | some machines the prologue is where the new fp value is |
7585 | established. */ | |
a6d9a66e | 7586 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7587 | |
7588 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7589 | ecs->event_thread->control.step_range_end |
7590 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7591 | } |
7592 | keep_going (ecs); | |
7593 | } | |
d4f3574e | 7594 | |
b2175913 MS |
7595 | /* Inferior has stepped backward into a subroutine call with source |
7596 | code that we should not step over. Do step to the beginning of the | |
7597 | last line of code in it. */ | |
7598 | ||
7599 | static void | |
568d6575 UW |
7600 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7601 | struct execution_control_state *ecs) | |
b2175913 | 7602 | { |
43f3e411 | 7603 | struct compunit_symtab *cust; |
167e4384 | 7604 | struct symtab_and_line stop_func_sal; |
b2175913 | 7605 | |
7e324e48 GB |
7606 | fill_in_stop_func (gdbarch, ecs); |
7607 | ||
f2ffa92b | 7608 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7609 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7610 | ecs->stop_func_start |
7611 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7612 | |
f2ffa92b | 7613 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7614 | |
7615 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7616 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7617 | { |
7618 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7619 | end_stepping_range (ecs); |
b2175913 MS |
7620 | } |
7621 | else | |
7622 | { | |
7623 | /* Else just reset the step range and keep going. | |
7624 | No step-resume breakpoint, they don't work for | |
7625 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7626 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7627 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7628 | keep_going (ecs); |
7629 | } | |
7630 | return; | |
7631 | } | |
7632 | ||
d3169d93 | 7633 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7634 | This is used to both functions and to skip over code. */ |
7635 | ||
7636 | static void | |
2c03e5be PA |
7637 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7638 | struct symtab_and_line sr_sal, | |
7639 | struct frame_id sr_id, | |
7640 | enum bptype sr_type) | |
44cbf7b5 | 7641 | { |
611c83ae PA |
7642 | /* There should never be more than one step-resume or longjmp-resume |
7643 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7644 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7645 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7646 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
7647 | |
7648 | if (debug_infrun) | |
7649 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7650 | "infrun: inserting step-resume breakpoint at %s\n", |
7651 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7652 | |
8358c15c | 7653 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7654 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7655 | } |
7656 | ||
9da8c2a0 | 7657 | void |
2c03e5be PA |
7658 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7659 | struct symtab_and_line sr_sal, | |
7660 | struct frame_id sr_id) | |
7661 | { | |
7662 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7663 | sr_sal, sr_id, | |
7664 | bp_step_resume); | |
44cbf7b5 | 7665 | } |
7ce450bd | 7666 | |
2c03e5be PA |
7667 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7668 | This is used to skip a potential signal handler. | |
7ce450bd | 7669 | |
14e60db5 DJ |
7670 | This is called with the interrupted function's frame. The signal |
7671 | handler, when it returns, will resume the interrupted function at | |
7672 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7673 | |
7674 | static void | |
2c03e5be | 7675 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7676 | { |
f4c1edd8 | 7677 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7678 | |
51abb421 PA |
7679 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7680 | ||
7681 | symtab_and_line sr_sal; | |
568d6575 | 7682 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7683 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7684 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7685 | |
2c03e5be PA |
7686 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7687 | get_stack_frame_id (return_frame), | |
7688 | bp_hp_step_resume); | |
d303a6c7 AC |
7689 | } |
7690 | ||
2c03e5be PA |
7691 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7692 | is used to skip a function after stepping into it (for "next" or if | |
7693 | the called function has no debugging information). | |
14e60db5 DJ |
7694 | |
7695 | The current function has almost always been reached by single | |
7696 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7697 | current function, and the breakpoint will be set at the caller's | |
7698 | resume address. | |
7699 | ||
7700 | This is a separate function rather than reusing | |
2c03e5be | 7701 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7702 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7703 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7704 | |
7705 | static void | |
7706 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7707 | { | |
14e60db5 DJ |
7708 | /* We shouldn't have gotten here if we don't know where the call site |
7709 | is. */ | |
c7ce8faa | 7710 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7711 | |
51abb421 | 7712 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7713 | |
51abb421 | 7714 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7715 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7716 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7717 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7718 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7719 | |
a6d9a66e | 7720 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7721 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7722 | } |
7723 | ||
611c83ae PA |
7724 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7725 | new breakpoint at the target of a jmp_buf. The handling of | |
7726 | longjmp-resume uses the same mechanisms used for handling | |
7727 | "step-resume" breakpoints. */ | |
7728 | ||
7729 | static void | |
a6d9a66e | 7730 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7731 | { |
e81a37f7 TT |
7732 | /* There should never be more than one longjmp-resume breakpoint per |
7733 | thread, so we should never be setting a new | |
611c83ae | 7734 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7735 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
7736 | |
7737 | if (debug_infrun) | |
7738 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7739 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
7740 | paddress (gdbarch, pc)); | |
611c83ae | 7741 | |
e81a37f7 | 7742 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7743 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7744 | } |
7745 | ||
186c406b TT |
7746 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7747 | the exception. The block B is the block of the unwinder debug hook | |
7748 | function. FRAME is the frame corresponding to the call to this | |
7749 | function. SYM is the symbol of the function argument holding the | |
7750 | target PC of the exception. */ | |
7751 | ||
7752 | static void | |
7753 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7754 | const struct block *b, |
186c406b TT |
7755 | struct frame_info *frame, |
7756 | struct symbol *sym) | |
7757 | { | |
a70b8144 | 7758 | try |
186c406b | 7759 | { |
63e43d3a | 7760 | struct block_symbol vsym; |
186c406b TT |
7761 | struct value *value; |
7762 | CORE_ADDR handler; | |
7763 | struct breakpoint *bp; | |
7764 | ||
987012b8 | 7765 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 7766 | b, VAR_DOMAIN); |
63e43d3a | 7767 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7768 | /* If the value was optimized out, revert to the old behavior. */ |
7769 | if (! value_optimized_out (value)) | |
7770 | { | |
7771 | handler = value_as_address (value); | |
7772 | ||
7773 | if (debug_infrun) | |
7774 | fprintf_unfiltered (gdb_stdlog, | |
7775 | "infrun: exception resume at %lx\n", | |
7776 | (unsigned long) handler); | |
7777 | ||
7778 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7779 | handler, |
7780 | bp_exception_resume).release (); | |
c70a6932 JK |
7781 | |
7782 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7783 | frame = NULL; | |
7784 | ||
5d5658a1 | 7785 | bp->thread = tp->global_num; |
186c406b TT |
7786 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7787 | } | |
7788 | } | |
230d2906 | 7789 | catch (const gdb_exception_error &e) |
492d29ea PA |
7790 | { |
7791 | /* We want to ignore errors here. */ | |
7792 | } | |
186c406b TT |
7793 | } |
7794 | ||
28106bc2 SDJ |
7795 | /* A helper for check_exception_resume that sets an |
7796 | exception-breakpoint based on a SystemTap probe. */ | |
7797 | ||
7798 | static void | |
7799 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7800 | const struct bound_probe *probe, |
28106bc2 SDJ |
7801 | struct frame_info *frame) |
7802 | { | |
7803 | struct value *arg_value; | |
7804 | CORE_ADDR handler; | |
7805 | struct breakpoint *bp; | |
7806 | ||
7807 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7808 | if (!arg_value) | |
7809 | return; | |
7810 | ||
7811 | handler = value_as_address (arg_value); | |
7812 | ||
7813 | if (debug_infrun) | |
7814 | fprintf_unfiltered (gdb_stdlog, | |
7815 | "infrun: exception resume at %s\n", | |
6bac7473 | 7816 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
7817 | handler)); |
7818 | ||
7819 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7820 | handler, bp_exception_resume).release (); |
5d5658a1 | 7821 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7822 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7823 | } | |
7824 | ||
186c406b TT |
7825 | /* This is called when an exception has been intercepted. Check to |
7826 | see whether the exception's destination is of interest, and if so, | |
7827 | set an exception resume breakpoint there. */ | |
7828 | ||
7829 | static void | |
7830 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7831 | struct frame_info *frame) |
186c406b | 7832 | { |
729662a5 | 7833 | struct bound_probe probe; |
28106bc2 SDJ |
7834 | struct symbol *func; |
7835 | ||
7836 | /* First see if this exception unwinding breakpoint was set via a | |
7837 | SystemTap probe point. If so, the probe has two arguments: the | |
7838 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7839 | set a breakpoint there. */ | |
6bac7473 | 7840 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7841 | if (probe.prob) |
28106bc2 | 7842 | { |
729662a5 | 7843 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7844 | return; |
7845 | } | |
7846 | ||
7847 | func = get_frame_function (frame); | |
7848 | if (!func) | |
7849 | return; | |
186c406b | 7850 | |
a70b8144 | 7851 | try |
186c406b | 7852 | { |
3977b71f | 7853 | const struct block *b; |
8157b174 | 7854 | struct block_iterator iter; |
186c406b TT |
7855 | struct symbol *sym; |
7856 | int argno = 0; | |
7857 | ||
7858 | /* The exception breakpoint is a thread-specific breakpoint on | |
7859 | the unwinder's debug hook, declared as: | |
7860 | ||
7861 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7862 | ||
7863 | The CFA argument indicates the frame to which control is | |
7864 | about to be transferred. HANDLER is the destination PC. | |
7865 | ||
7866 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7867 | This is not extremely efficient but it avoids issues in gdb | |
7868 | with computing the DWARF CFA, and it also works even in weird | |
7869 | cases such as throwing an exception from inside a signal | |
7870 | handler. */ | |
7871 | ||
7872 | b = SYMBOL_BLOCK_VALUE (func); | |
7873 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7874 | { | |
7875 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7876 | continue; | |
7877 | ||
7878 | if (argno == 0) | |
7879 | ++argno; | |
7880 | else | |
7881 | { | |
7882 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7883 | b, frame, sym); | |
7884 | break; | |
7885 | } | |
7886 | } | |
7887 | } | |
230d2906 | 7888 | catch (const gdb_exception_error &e) |
492d29ea PA |
7889 | { |
7890 | } | |
186c406b TT |
7891 | } |
7892 | ||
104c1213 | 7893 | static void |
22bcd14b | 7894 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7895 | { |
527159b7 | 7896 | if (debug_infrun) |
22bcd14b | 7897 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 7898 | |
cd0fc7c3 SS |
7899 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7900 | ecs->wait_some_more = 0; | |
fbea99ea PA |
7901 | |
7902 | /* If all-stop, but the target is always in non-stop mode, stop all | |
7903 | threads now that we're presenting the stop to the user. */ | |
7904 | if (!non_stop && target_is_non_stop_p ()) | |
7905 | stop_all_threads (); | |
cd0fc7c3 SS |
7906 | } |
7907 | ||
4d9d9d04 PA |
7908 | /* Like keep_going, but passes the signal to the inferior, even if the |
7909 | signal is set to nopass. */ | |
d4f3574e SS |
7910 | |
7911 | static void | |
4d9d9d04 | 7912 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7913 | { |
d7e15655 | 7914 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 7915 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7916 | |
d4f3574e | 7917 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 7918 | ecs->event_thread->prev_pc |
00431a78 | 7919 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 7920 | |
4d9d9d04 | 7921 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7922 | { |
4d9d9d04 PA |
7923 | struct thread_info *tp = ecs->event_thread; |
7924 | ||
7925 | if (debug_infrun) | |
7926 | fprintf_unfiltered (gdb_stdlog, | |
7927 | "infrun: %s has trap_expected set, " | |
7928 | "resuming to collect trap\n", | |
a068643d | 7929 | target_pid_to_str (tp->ptid).c_str ()); |
4d9d9d04 | 7930 | |
a9ba6bae PA |
7931 | /* We haven't yet gotten our trap, and either: intercepted a |
7932 | non-signal event (e.g., a fork); or took a signal which we | |
7933 | are supposed to pass through to the inferior. Simply | |
7934 | continue. */ | |
64ce06e4 | 7935 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7936 | } |
372316f1 PA |
7937 | else if (step_over_info_valid_p ()) |
7938 | { | |
7939 | /* Another thread is stepping over a breakpoint in-line. If | |
7940 | this thread needs a step-over too, queue the request. In | |
7941 | either case, this resume must be deferred for later. */ | |
7942 | struct thread_info *tp = ecs->event_thread; | |
7943 | ||
7944 | if (ecs->hit_singlestep_breakpoint | |
7945 | || thread_still_needs_step_over (tp)) | |
7946 | { | |
7947 | if (debug_infrun) | |
7948 | fprintf_unfiltered (gdb_stdlog, | |
7949 | "infrun: step-over already in progress: " | |
7950 | "step-over for %s deferred\n", | |
a068643d | 7951 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
7952 | thread_step_over_chain_enqueue (tp); |
7953 | } | |
7954 | else | |
7955 | { | |
7956 | if (debug_infrun) | |
7957 | fprintf_unfiltered (gdb_stdlog, | |
7958 | "infrun: step-over in progress: " | |
7959 | "resume of %s deferred\n", | |
a068643d | 7960 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 | 7961 | } |
372316f1 | 7962 | } |
d4f3574e SS |
7963 | else |
7964 | { | |
31e77af2 | 7965 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7966 | int remove_bp; |
7967 | int remove_wps; | |
8d297bbf | 7968 | step_over_what step_what; |
31e77af2 | 7969 | |
d4f3574e | 7970 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7971 | anyway (if we got a signal, the user asked it be passed to |
7972 | the child) | |
7973 | -- or -- | |
7974 | We got our expected trap, but decided we should resume from | |
7975 | it. | |
d4f3574e | 7976 | |
a9ba6bae | 7977 | We're going to run this baby now! |
d4f3574e | 7978 | |
c36b740a VP |
7979 | Note that insert_breakpoints won't try to re-insert |
7980 | already inserted breakpoints. Therefore, we don't | |
7981 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7982 | |
31e77af2 PA |
7983 | /* If we need to step over a breakpoint, and we're not using |
7984 | displaced stepping to do so, insert all breakpoints | |
7985 | (watchpoints, etc.) but the one we're stepping over, step one | |
7986 | instruction, and then re-insert the breakpoint when that step | |
7987 | is finished. */ | |
963f9c80 | 7988 | |
6c4cfb24 PA |
7989 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7990 | ||
963f9c80 | 7991 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7992 | || (step_what & STEP_OVER_BREAKPOINT)); |
7993 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7994 | |
cb71640d PA |
7995 | /* We can't use displaced stepping if we need to step past a |
7996 | watchpoint. The instruction copied to the scratch pad would | |
7997 | still trigger the watchpoint. */ | |
7998 | if (remove_bp | |
3fc8eb30 | 7999 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 8000 | { |
a01bda52 | 8001 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
8002 | regcache_read_pc (regcache), remove_wps, |
8003 | ecs->event_thread->global_num); | |
45e8c884 | 8004 | } |
963f9c80 | 8005 | else if (remove_wps) |
21edc42f | 8006 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
8007 | |
8008 | /* If we now need to do an in-line step-over, we need to stop | |
8009 | all other threads. Note this must be done before | |
8010 | insert_breakpoints below, because that removes the breakpoint | |
8011 | we're about to step over, otherwise other threads could miss | |
8012 | it. */ | |
fbea99ea | 8013 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 8014 | stop_all_threads (); |
abbb1732 | 8015 | |
31e77af2 | 8016 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 8017 | try |
31e77af2 PA |
8018 | { |
8019 | insert_breakpoints (); | |
8020 | } | |
230d2906 | 8021 | catch (const gdb_exception_error &e) |
31e77af2 PA |
8022 | { |
8023 | exception_print (gdb_stderr, e); | |
22bcd14b | 8024 | stop_waiting (ecs); |
bdf2a94a | 8025 | clear_step_over_info (); |
31e77af2 | 8026 | return; |
d4f3574e SS |
8027 | } |
8028 | ||
963f9c80 | 8029 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 8030 | |
64ce06e4 | 8031 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
8032 | } |
8033 | ||
488f131b | 8034 | prepare_to_wait (ecs); |
d4f3574e SS |
8035 | } |
8036 | ||
4d9d9d04 PA |
8037 | /* Called when we should continue running the inferior, because the |
8038 | current event doesn't cause a user visible stop. This does the | |
8039 | resuming part; waiting for the next event is done elsewhere. */ | |
8040 | ||
8041 | static void | |
8042 | keep_going (struct execution_control_state *ecs) | |
8043 | { | |
8044 | if (ecs->event_thread->control.trap_expected | |
8045 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
8046 | ecs->event_thread->control.trap_expected = 0; | |
8047 | ||
8048 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
8049 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
8050 | keep_going_pass_signal (ecs); | |
8051 | } | |
8052 | ||
104c1213 JM |
8053 | /* This function normally comes after a resume, before |
8054 | handle_inferior_event exits. It takes care of any last bits of | |
8055 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 8056 | |
104c1213 JM |
8057 | static void |
8058 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 8059 | { |
527159b7 | 8060 | if (debug_infrun) |
8a9de0e4 | 8061 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 8062 | |
104c1213 | 8063 | ecs->wait_some_more = 1; |
0b333c5e PA |
8064 | |
8065 | if (!target_is_async_p ()) | |
8066 | mark_infrun_async_event_handler (); | |
c906108c | 8067 | } |
11cf8741 | 8068 | |
fd664c91 | 8069 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 8070 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
8071 | |
8072 | static void | |
bdc36728 | 8073 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 8074 | { |
bdc36728 | 8075 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 8076 | stop_waiting (ecs); |
fd664c91 PA |
8077 | } |
8078 | ||
33d62d64 JK |
8079 | /* Several print_*_reason functions to print why the inferior has stopped. |
8080 | We always print something when the inferior exits, or receives a signal. | |
8081 | The rest of the cases are dealt with later on in normal_stop and | |
8082 | print_it_typical. Ideally there should be a call to one of these | |
8083 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 8084 | stop_waiting is called. |
33d62d64 | 8085 | |
fd664c91 PA |
8086 | Note that we don't call these directly, instead we delegate that to |
8087 | the interpreters, through observers. Interpreters then call these | |
8088 | with whatever uiout is right. */ | |
33d62d64 | 8089 | |
fd664c91 PA |
8090 | void |
8091 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 8092 | { |
fd664c91 | 8093 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 8094 | |
112e8700 | 8095 | if (uiout->is_mi_like_p ()) |
fd664c91 | 8096 | { |
112e8700 | 8097 | uiout->field_string ("reason", |
fd664c91 PA |
8098 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
8099 | } | |
8100 | } | |
33d62d64 | 8101 | |
fd664c91 PA |
8102 | void |
8103 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 8104 | { |
33d62d64 | 8105 | annotate_signalled (); |
112e8700 SM |
8106 | if (uiout->is_mi_like_p ()) |
8107 | uiout->field_string | |
8108 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8109 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 8110 | annotate_signal_name (); |
112e8700 | 8111 | uiout->field_string ("signal-name", |
2ea28649 | 8112 | gdb_signal_to_name (siggnal)); |
33d62d64 | 8113 | annotate_signal_name_end (); |
112e8700 | 8114 | uiout->text (", "); |
33d62d64 | 8115 | annotate_signal_string (); |
112e8700 | 8116 | uiout->field_string ("signal-meaning", |
2ea28649 | 8117 | gdb_signal_to_string (siggnal)); |
33d62d64 | 8118 | annotate_signal_string_end (); |
112e8700 SM |
8119 | uiout->text (".\n"); |
8120 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
8121 | } |
8122 | ||
fd664c91 PA |
8123 | void |
8124 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 8125 | { |
fda326dd | 8126 | struct inferior *inf = current_inferior (); |
a068643d | 8127 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 8128 | |
33d62d64 JK |
8129 | annotate_exited (exitstatus); |
8130 | if (exitstatus) | |
8131 | { | |
112e8700 SM |
8132 | if (uiout->is_mi_like_p ()) |
8133 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
8134 | std::string exit_code_str |
8135 | = string_printf ("0%o", (unsigned int) exitstatus); | |
8136 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
8137 | plongest (inf->num), pidstr.c_str (), | |
8138 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
8139 | } |
8140 | else | |
11cf8741 | 8141 | { |
112e8700 SM |
8142 | if (uiout->is_mi_like_p ()) |
8143 | uiout->field_string | |
8144 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
8145 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
8146 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 8147 | } |
33d62d64 JK |
8148 | } |
8149 | ||
012b3a21 WT |
8150 | /* Some targets/architectures can do extra processing/display of |
8151 | segmentation faults. E.g., Intel MPX boundary faults. | |
8152 | Call the architecture dependent function to handle the fault. */ | |
8153 | ||
8154 | static void | |
8155 | handle_segmentation_fault (struct ui_out *uiout) | |
8156 | { | |
8157 | struct regcache *regcache = get_current_regcache (); | |
ac7936df | 8158 | struct gdbarch *gdbarch = regcache->arch (); |
012b3a21 WT |
8159 | |
8160 | if (gdbarch_handle_segmentation_fault_p (gdbarch)) | |
8161 | gdbarch_handle_segmentation_fault (gdbarch, uiout); | |
8162 | } | |
8163 | ||
fd664c91 PA |
8164 | void |
8165 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 8166 | { |
f303dbd6 PA |
8167 | struct thread_info *thr = inferior_thread (); |
8168 | ||
33d62d64 JK |
8169 | annotate_signal (); |
8170 | ||
112e8700 | 8171 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
8172 | ; |
8173 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 8174 | { |
f303dbd6 | 8175 | const char *name; |
33d62d64 | 8176 | |
112e8700 | 8177 | uiout->text ("\nThread "); |
33eca680 | 8178 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 PA |
8179 | |
8180 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
8181 | if (name != NULL) | |
8182 | { | |
112e8700 | 8183 | uiout->text (" \""); |
33eca680 | 8184 | uiout->field_string ("name", name); |
112e8700 | 8185 | uiout->text ("\""); |
f303dbd6 | 8186 | } |
33d62d64 | 8187 | } |
f303dbd6 | 8188 | else |
112e8700 | 8189 | uiout->text ("\nProgram"); |
f303dbd6 | 8190 | |
112e8700 SM |
8191 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8192 | uiout->text (" stopped"); | |
33d62d64 JK |
8193 | else |
8194 | { | |
112e8700 | 8195 | uiout->text (" received signal "); |
8b93c638 | 8196 | annotate_signal_name (); |
112e8700 SM |
8197 | if (uiout->is_mi_like_p ()) |
8198 | uiout->field_string | |
8199 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8200 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8201 | annotate_signal_name_end (); |
112e8700 | 8202 | uiout->text (", "); |
8b93c638 | 8203 | annotate_signal_string (); |
112e8700 | 8204 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 WT |
8205 | |
8206 | if (siggnal == GDB_SIGNAL_SEGV) | |
8207 | handle_segmentation_fault (uiout); | |
8208 | ||
8b93c638 | 8209 | annotate_signal_string_end (); |
33d62d64 | 8210 | } |
112e8700 | 8211 | uiout->text (".\n"); |
33d62d64 | 8212 | } |
252fbfc8 | 8213 | |
fd664c91 PA |
8214 | void |
8215 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8216 | { |
112e8700 | 8217 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8218 | } |
43ff13b4 | 8219 | |
0c7e1a46 PA |
8220 | /* Print current location without a level number, if we have changed |
8221 | functions or hit a breakpoint. Print source line if we have one. | |
8222 | bpstat_print contains the logic deciding in detail what to print, | |
8223 | based on the event(s) that just occurred. */ | |
8224 | ||
243a9253 PA |
8225 | static void |
8226 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8227 | { |
8228 | int bpstat_ret; | |
f486487f | 8229 | enum print_what source_flag; |
0c7e1a46 PA |
8230 | int do_frame_printing = 1; |
8231 | struct thread_info *tp = inferior_thread (); | |
8232 | ||
8233 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8234 | switch (bpstat_ret) | |
8235 | { | |
8236 | case PRINT_UNKNOWN: | |
8237 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8238 | should) carry around the function and does (or should) use | |
8239 | that when doing a frame comparison. */ | |
8240 | if (tp->control.stop_step | |
8241 | && frame_id_eq (tp->control.step_frame_id, | |
8242 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
8243 | && (tp->control.step_start_function |
8244 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
8245 | { |
8246 | /* Finished step, just print source line. */ | |
8247 | source_flag = SRC_LINE; | |
8248 | } | |
8249 | else | |
8250 | { | |
8251 | /* Print location and source line. */ | |
8252 | source_flag = SRC_AND_LOC; | |
8253 | } | |
8254 | break; | |
8255 | case PRINT_SRC_AND_LOC: | |
8256 | /* Print location and source line. */ | |
8257 | source_flag = SRC_AND_LOC; | |
8258 | break; | |
8259 | case PRINT_SRC_ONLY: | |
8260 | source_flag = SRC_LINE; | |
8261 | break; | |
8262 | case PRINT_NOTHING: | |
8263 | /* Something bogus. */ | |
8264 | source_flag = SRC_LINE; | |
8265 | do_frame_printing = 0; | |
8266 | break; | |
8267 | default: | |
8268 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8269 | } | |
8270 | ||
8271 | /* The behavior of this routine with respect to the source | |
8272 | flag is: | |
8273 | SRC_LINE: Print only source line | |
8274 | LOCATION: Print only location | |
8275 | SRC_AND_LOC: Print location and source line. */ | |
8276 | if (do_frame_printing) | |
8277 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8278 | } |
8279 | ||
243a9253 PA |
8280 | /* See infrun.h. */ |
8281 | ||
8282 | void | |
4c7d57e7 | 8283 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8284 | { |
243a9253 | 8285 | struct target_waitstatus last; |
243a9253 PA |
8286 | struct thread_info *tp; |
8287 | ||
5b6d1e4f | 8288 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8289 | |
67ad9399 TT |
8290 | { |
8291 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8292 | |
67ad9399 | 8293 | print_stop_location (&last); |
243a9253 | 8294 | |
67ad9399 | 8295 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8296 | if (displays) |
8297 | do_displays (); | |
67ad9399 | 8298 | } |
243a9253 PA |
8299 | |
8300 | tp = inferior_thread (); | |
8301 | if (tp->thread_fsm != NULL | |
46e3ed7f | 8302 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
8303 | { |
8304 | struct return_value_info *rv; | |
8305 | ||
46e3ed7f | 8306 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
8307 | if (rv != NULL) |
8308 | print_return_value (uiout, rv); | |
8309 | } | |
0c7e1a46 PA |
8310 | } |
8311 | ||
388a7084 PA |
8312 | /* See infrun.h. */ |
8313 | ||
8314 | void | |
8315 | maybe_remove_breakpoints (void) | |
8316 | { | |
8317 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
8318 | { | |
8319 | if (remove_breakpoints ()) | |
8320 | { | |
223ffa71 | 8321 | target_terminal::ours_for_output (); |
388a7084 PA |
8322 | printf_filtered (_("Cannot remove breakpoints because " |
8323 | "program is no longer writable.\nFurther " | |
8324 | "execution is probably impossible.\n")); | |
8325 | } | |
8326 | } | |
8327 | } | |
8328 | ||
4c2f2a79 PA |
8329 | /* The execution context that just caused a normal stop. */ |
8330 | ||
8331 | struct stop_context | |
8332 | { | |
2d844eaf TT |
8333 | stop_context (); |
8334 | ~stop_context (); | |
8335 | ||
8336 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8337 | ||
8338 | bool changed () const; | |
8339 | ||
4c2f2a79 PA |
8340 | /* The stop ID. */ |
8341 | ULONGEST stop_id; | |
c906108c | 8342 | |
4c2f2a79 | 8343 | /* The event PTID. */ |
c906108c | 8344 | |
4c2f2a79 PA |
8345 | ptid_t ptid; |
8346 | ||
8347 | /* If stopp for a thread event, this is the thread that caused the | |
8348 | stop. */ | |
8349 | struct thread_info *thread; | |
8350 | ||
8351 | /* The inferior that caused the stop. */ | |
8352 | int inf_num; | |
8353 | }; | |
8354 | ||
2d844eaf | 8355 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8356 | takes a strong reference to the thread. */ |
8357 | ||
2d844eaf | 8358 | stop_context::stop_context () |
4c2f2a79 | 8359 | { |
2d844eaf TT |
8360 | stop_id = get_stop_id (); |
8361 | ptid = inferior_ptid; | |
8362 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8363 | |
d7e15655 | 8364 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8365 | { |
8366 | /* Take a strong reference so that the thread can't be deleted | |
8367 | yet. */ | |
2d844eaf TT |
8368 | thread = inferior_thread (); |
8369 | thread->incref (); | |
4c2f2a79 PA |
8370 | } |
8371 | else | |
2d844eaf | 8372 | thread = NULL; |
4c2f2a79 PA |
8373 | } |
8374 | ||
8375 | /* Release a stop context previously created with save_stop_context. | |
8376 | Releases the strong reference to the thread as well. */ | |
8377 | ||
2d844eaf | 8378 | stop_context::~stop_context () |
4c2f2a79 | 8379 | { |
2d844eaf TT |
8380 | if (thread != NULL) |
8381 | thread->decref (); | |
4c2f2a79 PA |
8382 | } |
8383 | ||
8384 | /* Return true if the current context no longer matches the saved stop | |
8385 | context. */ | |
8386 | ||
2d844eaf TT |
8387 | bool |
8388 | stop_context::changed () const | |
8389 | { | |
8390 | if (ptid != inferior_ptid) | |
8391 | return true; | |
8392 | if (inf_num != current_inferior ()->num) | |
8393 | return true; | |
8394 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8395 | return true; | |
8396 | if (get_stop_id () != stop_id) | |
8397 | return true; | |
8398 | return false; | |
4c2f2a79 PA |
8399 | } |
8400 | ||
8401 | /* See infrun.h. */ | |
8402 | ||
8403 | int | |
96baa820 | 8404 | normal_stop (void) |
c906108c | 8405 | { |
73b65bb0 | 8406 | struct target_waitstatus last; |
73b65bb0 | 8407 | |
5b6d1e4f | 8408 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8409 | |
4c2f2a79 PA |
8410 | new_stop_id (); |
8411 | ||
29f49a6a PA |
8412 | /* If an exception is thrown from this point on, make sure to |
8413 | propagate GDB's knowledge of the executing state to the | |
8414 | frontend/user running state. A QUIT is an easy exception to see | |
8415 | here, so do this before any filtered output. */ | |
731f534f | 8416 | |
5b6d1e4f | 8417 | ptid_t finish_ptid = null_ptid; |
731f534f | 8418 | |
c35b1492 | 8419 | if (!non_stop) |
5b6d1e4f | 8420 | finish_ptid = minus_one_ptid; |
e1316e60 PA |
8421 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8422 | || last.kind == TARGET_WAITKIND_EXITED) | |
8423 | { | |
8424 | /* On some targets, we may still have live threads in the | |
8425 | inferior when we get a process exit event. E.g., for | |
8426 | "checkpoint", when the current checkpoint/fork exits, | |
8427 | linux-fork.c automatically switches to another fork from | |
8428 | within target_mourn_inferior. */ | |
731f534f | 8429 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8430 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 PA |
8431 | } |
8432 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5b6d1e4f PA |
8433 | finish_ptid = inferior_ptid; |
8434 | ||
8435 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8436 | if (finish_ptid != null_ptid) | |
8437 | { | |
8438 | maybe_finish_thread_state.emplace | |
8439 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8440 | } | |
29f49a6a | 8441 | |
b57bacec PA |
8442 | /* As we're presenting a stop, and potentially removing breakpoints, |
8443 | update the thread list so we can tell whether there are threads | |
8444 | running on the target. With target remote, for example, we can | |
8445 | only learn about new threads when we explicitly update the thread | |
8446 | list. Do this before notifying the interpreters about signal | |
8447 | stops, end of stepping ranges, etc., so that the "new thread" | |
8448 | output is emitted before e.g., "Program received signal FOO", | |
8449 | instead of after. */ | |
8450 | update_thread_list (); | |
8451 | ||
8452 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 8453 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 8454 | |
c906108c SS |
8455 | /* As with the notification of thread events, we want to delay |
8456 | notifying the user that we've switched thread context until | |
8457 | the inferior actually stops. | |
8458 | ||
73b65bb0 DJ |
8459 | There's no point in saying anything if the inferior has exited. |
8460 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8461 | "received a signal". |
8462 | ||
8463 | Also skip saying anything in non-stop mode. In that mode, as we | |
8464 | don't want GDB to switch threads behind the user's back, to avoid | |
8465 | races where the user is typing a command to apply to thread x, | |
8466 | but GDB switches to thread y before the user finishes entering | |
8467 | the command, fetch_inferior_event installs a cleanup to restore | |
8468 | the current thread back to the thread the user had selected right | |
8469 | after this event is handled, so we're not really switching, only | |
8470 | informing of a stop. */ | |
4f8d22e3 | 8471 | if (!non_stop |
731f534f | 8472 | && previous_inferior_ptid != inferior_ptid |
73b65bb0 DJ |
8473 | && target_has_execution |
8474 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8475 | && last.kind != TARGET_WAITKIND_EXITED |
8476 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8477 | { |
0e454242 | 8478 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8479 | { |
223ffa71 | 8480 | target_terminal::ours_for_output (); |
3b12939d | 8481 | printf_filtered (_("[Switching to %s]\n"), |
a068643d | 8482 | target_pid_to_str (inferior_ptid).c_str ()); |
3b12939d PA |
8483 | annotate_thread_changed (); |
8484 | } | |
39f77062 | 8485 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8486 | } |
c906108c | 8487 | |
0e5bf2a8 PA |
8488 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8489 | { | |
0e454242 | 8490 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8491 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8492 | { | |
223ffa71 | 8493 | target_terminal::ours_for_output (); |
3b12939d PA |
8494 | printf_filtered (_("No unwaited-for children left.\n")); |
8495 | } | |
0e5bf2a8 PA |
8496 | } |
8497 | ||
b57bacec | 8498 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8499 | maybe_remove_breakpoints (); |
c906108c | 8500 | |
c906108c SS |
8501 | /* If an auto-display called a function and that got a signal, |
8502 | delete that auto-display to avoid an infinite recursion. */ | |
8503 | ||
8504 | if (stopped_by_random_signal) | |
8505 | disable_current_display (); | |
8506 | ||
0e454242 | 8507 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8508 | { |
8509 | async_enable_stdin (); | |
8510 | } | |
c906108c | 8511 | |
388a7084 | 8512 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8513 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8514 | |
8515 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8516 | and current location is based on that. Handle the case where the | |
8517 | dummy call is returning after being stopped. E.g. the dummy call | |
8518 | previously hit a breakpoint. (If the dummy call returns | |
8519 | normally, we won't reach here.) Do this before the stop hook is | |
8520 | run, so that it doesn't get to see the temporary dummy frame, | |
8521 | which is not where we'll present the stop. */ | |
8522 | if (has_stack_frames ()) | |
8523 | { | |
8524 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8525 | { | |
8526 | /* Pop the empty frame that contains the stack dummy. This | |
8527 | also restores inferior state prior to the call (struct | |
8528 | infcall_suspend_state). */ | |
8529 | struct frame_info *frame = get_current_frame (); | |
8530 | ||
8531 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8532 | frame_pop (frame); | |
8533 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8534 | does which means there's now no selected frame. */ | |
8535 | } | |
8536 | ||
8537 | select_frame (get_current_frame ()); | |
8538 | ||
8539 | /* Set the current source location. */ | |
8540 | set_current_sal_from_frame (get_current_frame ()); | |
8541 | } | |
dd7e2d2b PA |
8542 | |
8543 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8544 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8545 | if (stop_command != NULL) |
8546 | { | |
2d844eaf | 8547 | stop_context saved_context; |
4c2f2a79 | 8548 | |
a70b8144 | 8549 | try |
bf469271 PA |
8550 | { |
8551 | execute_cmd_pre_hook (stop_command); | |
8552 | } | |
230d2906 | 8553 | catch (const gdb_exception &ex) |
bf469271 PA |
8554 | { |
8555 | exception_fprintf (gdb_stderr, ex, | |
8556 | "Error while running hook_stop:\n"); | |
8557 | } | |
4c2f2a79 PA |
8558 | |
8559 | /* If the stop hook resumes the target, then there's no point in | |
8560 | trying to notify about the previous stop; its context is | |
8561 | gone. Likewise if the command switches thread or inferior -- | |
8562 | the observers would print a stop for the wrong | |
8563 | thread/inferior. */ | |
2d844eaf TT |
8564 | if (saved_context.changed ()) |
8565 | return 1; | |
4c2f2a79 | 8566 | } |
dd7e2d2b | 8567 | |
388a7084 PA |
8568 | /* Notify observers about the stop. This is where the interpreters |
8569 | print the stop event. */ | |
d7e15655 | 8570 | if (inferior_ptid != null_ptid) |
76727919 | 8571 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
388a7084 PA |
8572 | stop_print_frame); |
8573 | else | |
76727919 | 8574 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8575 | |
243a9253 PA |
8576 | annotate_stopped (); |
8577 | ||
48844aa6 PA |
8578 | if (target_has_execution) |
8579 | { | |
8580 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
fe726667 PA |
8581 | && last.kind != TARGET_WAITKIND_EXITED |
8582 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8583 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8584 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8585 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8586 | } |
6c95b8df PA |
8587 | |
8588 | /* Try to get rid of automatically added inferiors that are no | |
8589 | longer needed. Keeping those around slows down things linearly. | |
8590 | Note that this never removes the current inferior. */ | |
8591 | prune_inferiors (); | |
4c2f2a79 PA |
8592 | |
8593 | return 0; | |
c906108c | 8594 | } |
c906108c | 8595 | \f |
c5aa993b | 8596 | int |
96baa820 | 8597 | signal_stop_state (int signo) |
c906108c | 8598 | { |
d6b48e9c | 8599 | return signal_stop[signo]; |
c906108c SS |
8600 | } |
8601 | ||
c5aa993b | 8602 | int |
96baa820 | 8603 | signal_print_state (int signo) |
c906108c SS |
8604 | { |
8605 | return signal_print[signo]; | |
8606 | } | |
8607 | ||
c5aa993b | 8608 | int |
96baa820 | 8609 | signal_pass_state (int signo) |
c906108c SS |
8610 | { |
8611 | return signal_program[signo]; | |
8612 | } | |
8613 | ||
2455069d UW |
8614 | static void |
8615 | signal_cache_update (int signo) | |
8616 | { | |
8617 | if (signo == -1) | |
8618 | { | |
a493e3e2 | 8619 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8620 | signal_cache_update (signo); |
8621 | ||
8622 | return; | |
8623 | } | |
8624 | ||
8625 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8626 | && signal_print[signo] == 0 | |
ab04a2af TT |
8627 | && signal_program[signo] == 1 |
8628 | && signal_catch[signo] == 0); | |
2455069d UW |
8629 | } |
8630 | ||
488f131b | 8631 | int |
7bda5e4a | 8632 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8633 | { |
8634 | int ret = signal_stop[signo]; | |
abbb1732 | 8635 | |
d4f3574e | 8636 | signal_stop[signo] = state; |
2455069d | 8637 | signal_cache_update (signo); |
d4f3574e SS |
8638 | return ret; |
8639 | } | |
8640 | ||
488f131b | 8641 | int |
7bda5e4a | 8642 | signal_print_update (int signo, int state) |
d4f3574e SS |
8643 | { |
8644 | int ret = signal_print[signo]; | |
abbb1732 | 8645 | |
d4f3574e | 8646 | signal_print[signo] = state; |
2455069d | 8647 | signal_cache_update (signo); |
d4f3574e SS |
8648 | return ret; |
8649 | } | |
8650 | ||
488f131b | 8651 | int |
7bda5e4a | 8652 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8653 | { |
8654 | int ret = signal_program[signo]; | |
abbb1732 | 8655 | |
d4f3574e | 8656 | signal_program[signo] = state; |
2455069d | 8657 | signal_cache_update (signo); |
d4f3574e SS |
8658 | return ret; |
8659 | } | |
8660 | ||
ab04a2af TT |
8661 | /* Update the global 'signal_catch' from INFO and notify the |
8662 | target. */ | |
8663 | ||
8664 | void | |
8665 | signal_catch_update (const unsigned int *info) | |
8666 | { | |
8667 | int i; | |
8668 | ||
8669 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8670 | signal_catch[i] = info[i] > 0; | |
8671 | signal_cache_update (-1); | |
adc6a863 | 8672 | target_pass_signals (signal_pass); |
ab04a2af TT |
8673 | } |
8674 | ||
c906108c | 8675 | static void |
96baa820 | 8676 | sig_print_header (void) |
c906108c | 8677 | { |
3e43a32a MS |
8678 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8679 | "to program\tDescription\n")); | |
c906108c SS |
8680 | } |
8681 | ||
8682 | static void | |
2ea28649 | 8683 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8684 | { |
2ea28649 | 8685 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8686 | int name_padding = 13 - strlen (name); |
96baa820 | 8687 | |
c906108c SS |
8688 | if (name_padding <= 0) |
8689 | name_padding = 0; | |
8690 | ||
8691 | printf_filtered ("%s", name); | |
488f131b | 8692 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8693 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8694 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8695 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8696 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8697 | } |
8698 | ||
8699 | /* Specify how various signals in the inferior should be handled. */ | |
8700 | ||
8701 | static void | |
0b39b52e | 8702 | handle_command (const char *args, int from_tty) |
c906108c | 8703 | { |
c906108c | 8704 | int digits, wordlen; |
b926417a | 8705 | int sigfirst, siglast; |
2ea28649 | 8706 | enum gdb_signal oursig; |
c906108c | 8707 | int allsigs; |
c906108c SS |
8708 | |
8709 | if (args == NULL) | |
8710 | { | |
e2e0b3e5 | 8711 | error_no_arg (_("signal to handle")); |
c906108c SS |
8712 | } |
8713 | ||
1777feb0 | 8714 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8715 | |
adc6a863 PA |
8716 | const size_t nsigs = GDB_SIGNAL_LAST; |
8717 | unsigned char sigs[nsigs] {}; | |
c906108c | 8718 | |
1777feb0 | 8719 | /* Break the command line up into args. */ |
c906108c | 8720 | |
773a1edc | 8721 | gdb_argv built_argv (args); |
c906108c SS |
8722 | |
8723 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8724 | actions. Signal numbers and signal names may be interspersed with | |
8725 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8726 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8727 | |
773a1edc | 8728 | for (char *arg : built_argv) |
c906108c | 8729 | { |
773a1edc TT |
8730 | wordlen = strlen (arg); |
8731 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8732 | {; |
8733 | } | |
8734 | allsigs = 0; | |
8735 | sigfirst = siglast = -1; | |
8736 | ||
773a1edc | 8737 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8738 | { |
8739 | /* Apply action to all signals except those used by the | |
1777feb0 | 8740 | debugger. Silently skip those. */ |
c906108c SS |
8741 | allsigs = 1; |
8742 | sigfirst = 0; | |
8743 | siglast = nsigs - 1; | |
8744 | } | |
773a1edc | 8745 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8746 | { |
8747 | SET_SIGS (nsigs, sigs, signal_stop); | |
8748 | SET_SIGS (nsigs, sigs, signal_print); | |
8749 | } | |
773a1edc | 8750 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8751 | { |
8752 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8753 | } | |
773a1edc | 8754 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8755 | { |
8756 | SET_SIGS (nsigs, sigs, signal_print); | |
8757 | } | |
773a1edc | 8758 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8759 | { |
8760 | SET_SIGS (nsigs, sigs, signal_program); | |
8761 | } | |
773a1edc | 8762 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8763 | { |
8764 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8765 | } | |
773a1edc | 8766 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8767 | { |
8768 | SET_SIGS (nsigs, sigs, signal_program); | |
8769 | } | |
773a1edc | 8770 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8771 | { |
8772 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8773 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8774 | } | |
773a1edc | 8775 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8776 | { |
8777 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8778 | } | |
8779 | else if (digits > 0) | |
8780 | { | |
8781 | /* It is numeric. The numeric signal refers to our own | |
8782 | internal signal numbering from target.h, not to host/target | |
8783 | signal number. This is a feature; users really should be | |
8784 | using symbolic names anyway, and the common ones like | |
8785 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8786 | ||
8787 | sigfirst = siglast = (int) | |
773a1edc TT |
8788 | gdb_signal_from_command (atoi (arg)); |
8789 | if (arg[digits] == '-') | |
c906108c SS |
8790 | { |
8791 | siglast = (int) | |
773a1edc | 8792 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8793 | } |
8794 | if (sigfirst > siglast) | |
8795 | { | |
1777feb0 | 8796 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8797 | std::swap (sigfirst, siglast); |
c906108c SS |
8798 | } |
8799 | } | |
8800 | else | |
8801 | { | |
773a1edc | 8802 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8803 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8804 | { |
8805 | sigfirst = siglast = (int) oursig; | |
8806 | } | |
8807 | else | |
8808 | { | |
8809 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8810 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8811 | } |
8812 | } | |
8813 | ||
8814 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8815 | which signals to apply actions to. */ |
c906108c | 8816 | |
b926417a | 8817 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8818 | { |
2ea28649 | 8819 | switch ((enum gdb_signal) signum) |
c906108c | 8820 | { |
a493e3e2 PA |
8821 | case GDB_SIGNAL_TRAP: |
8822 | case GDB_SIGNAL_INT: | |
c906108c SS |
8823 | if (!allsigs && !sigs[signum]) |
8824 | { | |
9e2f0ad4 | 8825 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8826 | Are you sure you want to change it? "), |
2ea28649 | 8827 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8828 | { |
8829 | sigs[signum] = 1; | |
8830 | } | |
8831 | else | |
c119e040 | 8832 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8833 | } |
8834 | break; | |
a493e3e2 PA |
8835 | case GDB_SIGNAL_0: |
8836 | case GDB_SIGNAL_DEFAULT: | |
8837 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8838 | /* Make sure that "all" doesn't print these. */ |
8839 | break; | |
8840 | default: | |
8841 | sigs[signum] = 1; | |
8842 | break; | |
8843 | } | |
8844 | } | |
c906108c SS |
8845 | } |
8846 | ||
b926417a | 8847 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8848 | if (sigs[signum]) |
8849 | { | |
2455069d | 8850 | signal_cache_update (-1); |
adc6a863 PA |
8851 | target_pass_signals (signal_pass); |
8852 | target_program_signals (signal_program); | |
c906108c | 8853 | |
3a031f65 PA |
8854 | if (from_tty) |
8855 | { | |
8856 | /* Show the results. */ | |
8857 | sig_print_header (); | |
8858 | for (; signum < nsigs; signum++) | |
8859 | if (sigs[signum]) | |
aead7601 | 8860 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8861 | } |
8862 | ||
8863 | break; | |
8864 | } | |
c906108c SS |
8865 | } |
8866 | ||
de0bea00 MF |
8867 | /* Complete the "handle" command. */ |
8868 | ||
eb3ff9a5 | 8869 | static void |
de0bea00 | 8870 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8871 | completion_tracker &tracker, |
6f937416 | 8872 | const char *text, const char *word) |
de0bea00 | 8873 | { |
de0bea00 MF |
8874 | static const char * const keywords[] = |
8875 | { | |
8876 | "all", | |
8877 | "stop", | |
8878 | "ignore", | |
8879 | "print", | |
8880 | "pass", | |
8881 | "nostop", | |
8882 | "noignore", | |
8883 | "noprint", | |
8884 | "nopass", | |
8885 | NULL, | |
8886 | }; | |
8887 | ||
eb3ff9a5 PA |
8888 | signal_completer (ignore, tracker, text, word); |
8889 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8890 | } |
8891 | ||
2ea28649 PA |
8892 | enum gdb_signal |
8893 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8894 | { |
8895 | if (num >= 1 && num <= 15) | |
2ea28649 | 8896 | return (enum gdb_signal) num; |
ed01b82c PA |
8897 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8898 | Use \"info signals\" for a list of symbolic signals.")); | |
8899 | } | |
8900 | ||
c906108c SS |
8901 | /* Print current contents of the tables set by the handle command. |
8902 | It is possible we should just be printing signals actually used | |
8903 | by the current target (but for things to work right when switching | |
8904 | targets, all signals should be in the signal tables). */ | |
8905 | ||
8906 | static void | |
1d12d88f | 8907 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8908 | { |
2ea28649 | 8909 | enum gdb_signal oursig; |
abbb1732 | 8910 | |
c906108c SS |
8911 | sig_print_header (); |
8912 | ||
8913 | if (signum_exp) | |
8914 | { | |
8915 | /* First see if this is a symbol name. */ | |
2ea28649 | 8916 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8917 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8918 | { |
8919 | /* No, try numeric. */ | |
8920 | oursig = | |
2ea28649 | 8921 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8922 | } |
8923 | sig_print_info (oursig); | |
8924 | return; | |
8925 | } | |
8926 | ||
8927 | printf_filtered ("\n"); | |
8928 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8929 | for (oursig = GDB_SIGNAL_FIRST; |
8930 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8931 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8932 | { |
8933 | QUIT; | |
8934 | ||
a493e3e2 PA |
8935 | if (oursig != GDB_SIGNAL_UNKNOWN |
8936 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8937 | sig_print_info (oursig); |
8938 | } | |
8939 | ||
3e43a32a MS |
8940 | printf_filtered (_("\nUse the \"handle\" command " |
8941 | "to change these tables.\n")); | |
c906108c | 8942 | } |
4aa995e1 PA |
8943 | |
8944 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8945 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8946 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8947 | also dependent on which thread you have selected. |
8948 | ||
8949 | 1. making $_siginfo be an internalvar that creates a new value on | |
8950 | access. | |
8951 | ||
8952 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8953 | ||
8954 | /* This function implements the lval_computed support for reading a | |
8955 | $_siginfo value. */ | |
8956 | ||
8957 | static void | |
8958 | siginfo_value_read (struct value *v) | |
8959 | { | |
8960 | LONGEST transferred; | |
8961 | ||
a911d87a PA |
8962 | /* If we can access registers, so can we access $_siginfo. Likewise |
8963 | vice versa. */ | |
8964 | validate_registers_access (); | |
c709acd1 | 8965 | |
4aa995e1 | 8966 | transferred = |
8b88a78e | 8967 | target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, |
4aa995e1 PA |
8968 | NULL, |
8969 | value_contents_all_raw (v), | |
8970 | value_offset (v), | |
8971 | TYPE_LENGTH (value_type (v))); | |
8972 | ||
8973 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8974 | error (_("Unable to read siginfo")); | |
8975 | } | |
8976 | ||
8977 | /* This function implements the lval_computed support for writing a | |
8978 | $_siginfo value. */ | |
8979 | ||
8980 | static void | |
8981 | siginfo_value_write (struct value *v, struct value *fromval) | |
8982 | { | |
8983 | LONGEST transferred; | |
8984 | ||
a911d87a PA |
8985 | /* If we can access registers, so can we access $_siginfo. Likewise |
8986 | vice versa. */ | |
8987 | validate_registers_access (); | |
c709acd1 | 8988 | |
8b88a78e | 8989 | transferred = target_write (current_top_target (), |
4aa995e1 PA |
8990 | TARGET_OBJECT_SIGNAL_INFO, |
8991 | NULL, | |
8992 | value_contents_all_raw (fromval), | |
8993 | value_offset (v), | |
8994 | TYPE_LENGTH (value_type (fromval))); | |
8995 | ||
8996 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8997 | error (_("Unable to write siginfo")); | |
8998 | } | |
8999 | ||
c8f2448a | 9000 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
9001 | { |
9002 | siginfo_value_read, | |
9003 | siginfo_value_write | |
9004 | }; | |
9005 | ||
9006 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
9007 | the current thread using architecture GDBARCH. Return a void value |
9008 | if there's no object available. */ | |
4aa995e1 | 9009 | |
2c0b251b | 9010 | static struct value * |
22d2b532 SDJ |
9011 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
9012 | void *ignore) | |
4aa995e1 | 9013 | { |
4aa995e1 | 9014 | if (target_has_stack |
d7e15655 | 9015 | && inferior_ptid != null_ptid |
78267919 | 9016 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 9017 | { |
78267919 | 9018 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 9019 | |
78267919 | 9020 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
9021 | } |
9022 | ||
78267919 | 9023 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
9024 | } |
9025 | ||
c906108c | 9026 | \f |
16c381f0 JK |
9027 | /* infcall_suspend_state contains state about the program itself like its |
9028 | registers and any signal it received when it last stopped. | |
9029 | This state must be restored regardless of how the inferior function call | |
9030 | ends (either successfully, or after it hits a breakpoint or signal) | |
9031 | if the program is to properly continue where it left off. */ | |
9032 | ||
6bf78e29 | 9033 | class infcall_suspend_state |
7a292a7a | 9034 | { |
6bf78e29 AB |
9035 | public: |
9036 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
9037 | once the inferior function call has finished. */ | |
9038 | infcall_suspend_state (struct gdbarch *gdbarch, | |
9039 | const struct thread_info *tp, | |
9040 | struct regcache *regcache) | |
9041 | : m_thread_suspend (tp->suspend), | |
9042 | m_registers (new readonly_detached_regcache (*regcache)) | |
9043 | { | |
9044 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
9045 | ||
9046 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
9047 | { | |
9048 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
9049 | size_t len = TYPE_LENGTH (type); | |
9050 | ||
9051 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); | |
9052 | ||
9053 | if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
9054 | siginfo_data.get (), 0, len) != len) | |
9055 | { | |
9056 | /* Errors ignored. */ | |
9057 | siginfo_data.reset (nullptr); | |
9058 | } | |
9059 | } | |
9060 | ||
9061 | if (siginfo_data) | |
9062 | { | |
9063 | m_siginfo_gdbarch = gdbarch; | |
9064 | m_siginfo_data = std::move (siginfo_data); | |
9065 | } | |
9066 | } | |
9067 | ||
9068 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 9069 | |
6bf78e29 AB |
9070 | readonly_detached_regcache *registers () const |
9071 | { | |
9072 | return m_registers.get (); | |
9073 | } | |
9074 | ||
9075 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
9076 | ||
9077 | void restore (struct gdbarch *gdbarch, | |
9078 | struct thread_info *tp, | |
9079 | struct regcache *regcache) const | |
9080 | { | |
9081 | tp->suspend = m_thread_suspend; | |
9082 | ||
9083 | if (m_siginfo_gdbarch == gdbarch) | |
9084 | { | |
9085 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
9086 | ||
9087 | /* Errors ignored. */ | |
9088 | target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
9089 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); | |
9090 | } | |
9091 | ||
9092 | /* The inferior can be gone if the user types "print exit(0)" | |
9093 | (and perhaps other times). */ | |
9094 | if (target_has_execution) | |
9095 | /* NB: The register write goes through to the target. */ | |
9096 | regcache->restore (registers ()); | |
9097 | } | |
9098 | ||
9099 | private: | |
9100 | /* How the current thread stopped before the inferior function call was | |
9101 | executed. */ | |
9102 | struct thread_suspend_state m_thread_suspend; | |
9103 | ||
9104 | /* The registers before the inferior function call was executed. */ | |
9105 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 9106 | |
35515841 | 9107 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 9108 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
9109 | |
9110 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
9111 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
9112 | content would be invalid. */ | |
6bf78e29 | 9113 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
9114 | }; |
9115 | ||
cb524840 TT |
9116 | infcall_suspend_state_up |
9117 | save_infcall_suspend_state () | |
b89667eb | 9118 | { |
b89667eb | 9119 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 9120 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9121 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 9122 | |
6bf78e29 AB |
9123 | infcall_suspend_state_up inf_state |
9124 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 9125 | |
6bf78e29 AB |
9126 | /* Having saved the current state, adjust the thread state, discarding |
9127 | any stop signal information. The stop signal is not useful when | |
9128 | starting an inferior function call, and run_inferior_call will not use | |
9129 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 9130 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 9131 | |
b89667eb DE |
9132 | return inf_state; |
9133 | } | |
9134 | ||
9135 | /* Restore inferior session state to INF_STATE. */ | |
9136 | ||
9137 | void | |
16c381f0 | 9138 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
9139 | { |
9140 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 9141 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9142 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 9143 | |
6bf78e29 | 9144 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 9145 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
9146 | } |
9147 | ||
b89667eb | 9148 | void |
16c381f0 | 9149 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 9150 | { |
dd848631 | 9151 | delete inf_state; |
b89667eb DE |
9152 | } |
9153 | ||
daf6667d | 9154 | readonly_detached_regcache * |
16c381f0 | 9155 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 9156 | { |
6bf78e29 | 9157 | return inf_state->registers (); |
b89667eb DE |
9158 | } |
9159 | ||
16c381f0 JK |
9160 | /* infcall_control_state contains state regarding gdb's control of the |
9161 | inferior itself like stepping control. It also contains session state like | |
9162 | the user's currently selected frame. */ | |
b89667eb | 9163 | |
16c381f0 | 9164 | struct infcall_control_state |
b89667eb | 9165 | { |
16c381f0 JK |
9166 | struct thread_control_state thread_control; |
9167 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
9168 | |
9169 | /* Other fields: */ | |
ee841dd8 TT |
9170 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
9171 | int stopped_by_random_signal = 0; | |
7a292a7a | 9172 | |
b89667eb | 9173 | /* ID if the selected frame when the inferior function call was made. */ |
ee841dd8 | 9174 | struct frame_id selected_frame_id {}; |
7a292a7a SS |
9175 | }; |
9176 | ||
c906108c | 9177 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9178 | connection. */ |
c906108c | 9179 | |
cb524840 TT |
9180 | infcall_control_state_up |
9181 | save_infcall_control_state () | |
c906108c | 9182 | { |
cb524840 | 9183 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9184 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9185 | struct inferior *inf = current_inferior (); |
7a292a7a | 9186 | |
16c381f0 JK |
9187 | inf_status->thread_control = tp->control; |
9188 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9189 | |
8358c15c | 9190 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9191 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9192 | |
16c381f0 JK |
9193 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9194 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9195 | hand them back the original chain when restore_infcall_control_state is | |
9196 | called. */ | |
9197 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9198 | |
9199 | /* Other fields: */ | |
9200 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9201 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9202 | |
206415a3 | 9203 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 9204 | |
7a292a7a | 9205 | return inf_status; |
c906108c SS |
9206 | } |
9207 | ||
bf469271 PA |
9208 | static void |
9209 | restore_selected_frame (const frame_id &fid) | |
c906108c | 9210 | { |
bf469271 | 9211 | frame_info *frame = frame_find_by_id (fid); |
c906108c | 9212 | |
aa0cd9c1 AC |
9213 | /* If inf_status->selected_frame_id is NULL, there was no previously |
9214 | selected frame. */ | |
101dcfbe | 9215 | if (frame == NULL) |
c906108c | 9216 | { |
8a3fe4f8 | 9217 | warning (_("Unable to restore previously selected frame.")); |
bf469271 | 9218 | return; |
c906108c SS |
9219 | } |
9220 | ||
0f7d239c | 9221 | select_frame (frame); |
c906108c SS |
9222 | } |
9223 | ||
b89667eb DE |
9224 | /* Restore inferior session state to INF_STATUS. */ |
9225 | ||
c906108c | 9226 | void |
16c381f0 | 9227 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9228 | { |
4e1c45ea | 9229 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9230 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9231 | |
8358c15c JK |
9232 | if (tp->control.step_resume_breakpoint) |
9233 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9234 | ||
5b79abe7 TT |
9235 | if (tp->control.exception_resume_breakpoint) |
9236 | tp->control.exception_resume_breakpoint->disposition | |
9237 | = disp_del_at_next_stop; | |
9238 | ||
d82142e2 | 9239 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9240 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9241 | |
16c381f0 JK |
9242 | tp->control = inf_status->thread_control; |
9243 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9244 | |
9245 | /* Other fields: */ | |
9246 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9247 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9248 | |
b89667eb | 9249 | if (target_has_stack) |
c906108c | 9250 | { |
bf469271 | 9251 | /* The point of the try/catch is that if the stack is clobbered, |
101dcfbe AC |
9252 | walking the stack might encounter a garbage pointer and |
9253 | error() trying to dereference it. */ | |
a70b8144 | 9254 | try |
bf469271 PA |
9255 | { |
9256 | restore_selected_frame (inf_status->selected_frame_id); | |
9257 | } | |
230d2906 | 9258 | catch (const gdb_exception_error &ex) |
bf469271 PA |
9259 | { |
9260 | exception_fprintf (gdb_stderr, ex, | |
9261 | "Unable to restore previously selected frame:\n"); | |
9262 | /* Error in restoring the selected frame. Select the | |
9263 | innermost frame. */ | |
9264 | select_frame (get_current_frame ()); | |
9265 | } | |
c906108c | 9266 | } |
c906108c | 9267 | |
ee841dd8 | 9268 | delete inf_status; |
7a292a7a | 9269 | } |
c906108c SS |
9270 | |
9271 | void | |
16c381f0 | 9272 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9273 | { |
8358c15c JK |
9274 | if (inf_status->thread_control.step_resume_breakpoint) |
9275 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9276 | = disp_del_at_next_stop; | |
9277 | ||
5b79abe7 TT |
9278 | if (inf_status->thread_control.exception_resume_breakpoint) |
9279 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9280 | = disp_del_at_next_stop; | |
9281 | ||
1777feb0 | 9282 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9283 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9284 | |
ee841dd8 | 9285 | delete inf_status; |
7a292a7a | 9286 | } |
b89667eb | 9287 | \f |
7f89fd65 | 9288 | /* See infrun.h. */ |
0c557179 SDJ |
9289 | |
9290 | void | |
9291 | clear_exit_convenience_vars (void) | |
9292 | { | |
9293 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9294 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9295 | } | |
c5aa993b | 9296 | \f |
488f131b | 9297 | |
b2175913 MS |
9298 | /* User interface for reverse debugging: |
9299 | Set exec-direction / show exec-direction commands | |
9300 | (returns error unless target implements to_set_exec_direction method). */ | |
9301 | ||
170742de | 9302 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9303 | static const char exec_forward[] = "forward"; |
9304 | static const char exec_reverse[] = "reverse"; | |
9305 | static const char *exec_direction = exec_forward; | |
40478521 | 9306 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9307 | exec_forward, |
9308 | exec_reverse, | |
9309 | NULL | |
9310 | }; | |
9311 | ||
9312 | static void | |
eb4c3f4a | 9313 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9314 | struct cmd_list_element *cmd) |
9315 | { | |
9316 | if (target_can_execute_reverse) | |
9317 | { | |
9318 | if (!strcmp (exec_direction, exec_forward)) | |
9319 | execution_direction = EXEC_FORWARD; | |
9320 | else if (!strcmp (exec_direction, exec_reverse)) | |
9321 | execution_direction = EXEC_REVERSE; | |
9322 | } | |
8bbed405 MS |
9323 | else |
9324 | { | |
9325 | exec_direction = exec_forward; | |
9326 | error (_("Target does not support this operation.")); | |
9327 | } | |
b2175913 MS |
9328 | } |
9329 | ||
9330 | static void | |
9331 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9332 | struct cmd_list_element *cmd, const char *value) | |
9333 | { | |
9334 | switch (execution_direction) { | |
9335 | case EXEC_FORWARD: | |
9336 | fprintf_filtered (out, _("Forward.\n")); | |
9337 | break; | |
9338 | case EXEC_REVERSE: | |
9339 | fprintf_filtered (out, _("Reverse.\n")); | |
9340 | break; | |
b2175913 | 9341 | default: |
d8b34453 PA |
9342 | internal_error (__FILE__, __LINE__, |
9343 | _("bogus execution_direction value: %d"), | |
9344 | (int) execution_direction); | |
b2175913 MS |
9345 | } |
9346 | } | |
9347 | ||
d4db2f36 PA |
9348 | static void |
9349 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9350 | struct cmd_list_element *c, const char *value) | |
9351 | { | |
3e43a32a MS |
9352 | fprintf_filtered (file, _("Resuming the execution of threads " |
9353 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9354 | } |
ad52ddc6 | 9355 | |
22d2b532 SDJ |
9356 | /* Implementation of `siginfo' variable. */ |
9357 | ||
9358 | static const struct internalvar_funcs siginfo_funcs = | |
9359 | { | |
9360 | siginfo_make_value, | |
9361 | NULL, | |
9362 | NULL | |
9363 | }; | |
9364 | ||
372316f1 PA |
9365 | /* Callback for infrun's target events source. This is marked when a |
9366 | thread has a pending status to process. */ | |
9367 | ||
9368 | static void | |
9369 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9370 | { | |
372316f1 PA |
9371 | inferior_event_handler (INF_REG_EVENT, NULL); |
9372 | } | |
9373 | ||
6c265988 | 9374 | void _initialize_infrun (); |
c906108c | 9375 | void |
6c265988 | 9376 | _initialize_infrun () |
c906108c | 9377 | { |
de0bea00 | 9378 | struct cmd_list_element *c; |
c906108c | 9379 | |
372316f1 PA |
9380 | /* Register extra event sources in the event loop. */ |
9381 | infrun_async_inferior_event_token | |
9382 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
9383 | ||
11db9430 | 9384 | add_info ("signals", info_signals_command, _("\ |
1bedd215 AC |
9385 | What debugger does when program gets various signals.\n\ |
9386 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9387 | add_info_alias ("handle", "signals", 0); |
9388 | ||
de0bea00 | 9389 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9390 | Specify how to handle signals.\n\ |
486c7739 | 9391 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9392 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9393 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9394 | will be displayed instead.\n\ |
9395 | \n\ | |
c906108c SS |
9396 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9397 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9398 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9399 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9400 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9401 | \n\ |
1bedd215 | 9402 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9403 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9404 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9405 | Print means print a message if this signal happens.\n\ | |
9406 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9407 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9408 | Pass and Stop may be combined.\n\ |
9409 | \n\ | |
9410 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9411 | may be interspersed with actions, with the actions being performed for\n\ | |
9412 | all signals cumulatively specified.")); | |
de0bea00 | 9413 | set_cmd_completer (c, handle_completer); |
486c7739 | 9414 | |
c906108c | 9415 | if (!dbx_commands) |
1a966eab AC |
9416 | stop_command = add_cmd ("stop", class_obscure, |
9417 | not_just_help_class_command, _("\ | |
9418 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9419 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9420 | of the program stops."), &cmdlist); |
c906108c | 9421 | |
ccce17b0 | 9422 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9423 | Set inferior debugging."), _("\ |
9424 | Show inferior debugging."), _("\ | |
9425 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9426 | NULL, |
9427 | show_debug_infrun, | |
9428 | &setdebuglist, &showdebuglist); | |
527159b7 | 9429 | |
3e43a32a MS |
9430 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9431 | &debug_displaced, _("\ | |
237fc4c9 PA |
9432 | Set displaced stepping debugging."), _("\ |
9433 | Show displaced stepping debugging."), _("\ | |
9434 | When non-zero, displaced stepping specific debugging is enabled."), | |
9435 | NULL, | |
9436 | show_debug_displaced, | |
9437 | &setdebuglist, &showdebuglist); | |
9438 | ||
ad52ddc6 PA |
9439 | add_setshow_boolean_cmd ("non-stop", no_class, |
9440 | &non_stop_1, _("\ | |
9441 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9442 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9443 | When debugging a multi-threaded program and this setting is\n\ | |
9444 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9445 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9446 | all other threads in the program while you interact with the thread of\n\ | |
9447 | interest. When you continue or step a thread, you can allow the other\n\ | |
9448 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9449 | thread's state, all threads stop.\n\ | |
9450 | \n\ | |
9451 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9452 | to run freely. You'll be able to step each thread independently,\n\ | |
9453 | leave it stopped or free to run as needed."), | |
9454 | set_non_stop, | |
9455 | show_non_stop, | |
9456 | &setlist, | |
9457 | &showlist); | |
9458 | ||
adc6a863 | 9459 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9460 | { |
9461 | signal_stop[i] = 1; | |
9462 | signal_print[i] = 1; | |
9463 | signal_program[i] = 1; | |
ab04a2af | 9464 | signal_catch[i] = 0; |
c906108c SS |
9465 | } |
9466 | ||
4d9d9d04 PA |
9467 | /* Signals caused by debugger's own actions should not be given to |
9468 | the program afterwards. | |
9469 | ||
9470 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9471 | explicitly specifies that it should be delivered to the target | |
9472 | program. Typically, that would occur when a user is debugging a | |
9473 | target monitor on a simulator: the target monitor sets a | |
9474 | breakpoint; the simulator encounters this breakpoint and halts | |
9475 | the simulation handing control to GDB; GDB, noting that the stop | |
9476 | address doesn't map to any known breakpoint, returns control back | |
9477 | to the simulator; the simulator then delivers the hardware | |
9478 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9479 | debugged. */ | |
a493e3e2 PA |
9480 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9481 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9482 | |
9483 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9484 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9485 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9486 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9487 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9488 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9489 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9490 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9491 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9492 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9493 | signal_print[GDB_SIGNAL_IO] = 0; | |
9494 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9495 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9496 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9497 | signal_print[GDB_SIGNAL_URG] = 0; | |
9498 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9499 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9500 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9501 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9502 | |
cd0fc7c3 SS |
9503 | /* These signals are used internally by user-level thread |
9504 | implementations. (See signal(5) on Solaris.) Like the above | |
9505 | signals, a healthy program receives and handles them as part of | |
9506 | its normal operation. */ | |
a493e3e2 PA |
9507 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9508 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9509 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9510 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9511 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9512 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9513 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9514 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9515 | |
2455069d UW |
9516 | /* Update cached state. */ |
9517 | signal_cache_update (-1); | |
9518 | ||
85c07804 AC |
9519 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9520 | &stop_on_solib_events, _("\ | |
9521 | Set stopping for shared library events."), _("\ | |
9522 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9523 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9524 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9525 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9526 | set_stop_on_solib_events, |
920d2a44 | 9527 | show_stop_on_solib_events, |
85c07804 | 9528 | &setlist, &showlist); |
c906108c | 9529 | |
7ab04401 AC |
9530 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9531 | follow_fork_mode_kind_names, | |
9532 | &follow_fork_mode_string, _("\ | |
9533 | Set debugger response to a program call of fork or vfork."), _("\ | |
9534 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9535 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9536 | parent - the original process is debugged after a fork\n\ | |
9537 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9538 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9539 | By default, the debugger will follow the parent process."), |
9540 | NULL, | |
920d2a44 | 9541 | show_follow_fork_mode_string, |
7ab04401 AC |
9542 | &setlist, &showlist); |
9543 | ||
6c95b8df PA |
9544 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9545 | follow_exec_mode_names, | |
9546 | &follow_exec_mode_string, _("\ | |
9547 | Set debugger response to a program call of exec."), _("\ | |
9548 | Show debugger response to a program call of exec."), _("\ | |
9549 | An exec call replaces the program image of a process.\n\ | |
9550 | \n\ | |
9551 | follow-exec-mode can be:\n\ | |
9552 | \n\ | |
cce7e648 | 9553 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9554 | to this new inferior. The program the process was running before\n\ |
9555 | the exec call can be restarted afterwards by restarting the original\n\ | |
9556 | inferior.\n\ | |
9557 | \n\ | |
9558 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9559 | The new executable image replaces the previous executable loaded in\n\ | |
9560 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9561 | the executable the process was running after the exec call.\n\ | |
9562 | \n\ | |
9563 | By default, the debugger will use the same inferior."), | |
9564 | NULL, | |
9565 | show_follow_exec_mode_string, | |
9566 | &setlist, &showlist); | |
9567 | ||
7ab04401 AC |
9568 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9569 | scheduler_enums, &scheduler_mode, _("\ | |
9570 | Set mode for locking scheduler during execution."), _("\ | |
9571 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9572 | off == no locking (threads may preempt at any time)\n\ |
9573 | on == full locking (no thread except the current thread may run)\n\ | |
9574 | This applies to both normal execution and replay mode.\n\ | |
9575 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9576 | In this mode, other threads may run during other commands.\n\ | |
9577 | This applies to both normal execution and replay mode.\n\ | |
9578 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9579 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9580 | show_scheduler_mode, |
7ab04401 | 9581 | &setlist, &showlist); |
5fbbeb29 | 9582 | |
d4db2f36 PA |
9583 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9584 | Set mode for resuming threads of all processes."), _("\ | |
9585 | Show mode for resuming threads of all processes."), _("\ | |
9586 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9587 | threads of all processes. When off (which is the default), execution\n\ | |
9588 | commands only resume the threads of the current process. The set of\n\ | |
9589 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9590 | mode (see help set scheduler-locking)."), | |
9591 | NULL, | |
9592 | show_schedule_multiple, | |
9593 | &setlist, &showlist); | |
9594 | ||
5bf193a2 AC |
9595 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9596 | Set mode of the step operation."), _("\ | |
9597 | Show mode of the step operation."), _("\ | |
9598 | When set, doing a step over a function without debug line information\n\ | |
9599 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9600 | function is skipped and the step command stops at a different source line."), | |
9601 | NULL, | |
920d2a44 | 9602 | show_step_stop_if_no_debug, |
5bf193a2 | 9603 | &setlist, &showlist); |
ca6724c1 | 9604 | |
72d0e2c5 YQ |
9605 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9606 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9607 | Set debugger's willingness to use displaced stepping."), _("\ |
9608 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9609 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9610 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9611 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9612 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9613 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9614 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9615 | NULL, |
9616 | show_can_use_displaced_stepping, | |
9617 | &setlist, &showlist); | |
237fc4c9 | 9618 | |
b2175913 MS |
9619 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9620 | &exec_direction, _("Set direction of execution.\n\ | |
9621 | Options are 'forward' or 'reverse'."), | |
9622 | _("Show direction of execution (forward/reverse)."), | |
9623 | _("Tells gdb whether to execute forward or backward."), | |
9624 | set_exec_direction_func, show_exec_direction_func, | |
9625 | &setlist, &showlist); | |
9626 | ||
6c95b8df PA |
9627 | /* Set/show detach-on-fork: user-settable mode. */ |
9628 | ||
9629 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9630 | Set whether gdb will detach the child of a fork."), _("\ | |
9631 | Show whether gdb will detach the child of a fork."), _("\ | |
9632 | Tells gdb whether to detach the child of a fork."), | |
9633 | NULL, NULL, &setlist, &showlist); | |
9634 | ||
03583c20 UW |
9635 | /* Set/show disable address space randomization mode. */ |
9636 | ||
9637 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9638 | &disable_randomization, _("\ | |
9639 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9640 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9641 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9642 | address space is disabled. Standalone programs run with the randomization\n\ | |
9643 | enabled by default on some platforms."), | |
9644 | &set_disable_randomization, | |
9645 | &show_disable_randomization, | |
9646 | &setlist, &showlist); | |
9647 | ||
ca6724c1 | 9648 | /* ptid initializations */ |
ca6724c1 KB |
9649 | inferior_ptid = null_ptid; |
9650 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9651 | |
76727919 TT |
9652 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed); |
9653 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested); | |
9654 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit); | |
9655 | gdb::observers::inferior_exit.attach (infrun_inferior_exit); | |
4aa995e1 PA |
9656 | |
9657 | /* Explicitly create without lookup, since that tries to create a | |
9658 | value with a void typed value, and when we get here, gdbarch | |
9659 | isn't initialized yet. At this point, we're quite sure there | |
9660 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9661 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9662 | |
9663 | add_setshow_boolean_cmd ("observer", no_class, | |
9664 | &observer_mode_1, _("\ | |
9665 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9666 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9667 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9668 | affect its execution. Registers and memory may not be changed,\n\ | |
9669 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9670 | or signalled."), | |
9671 | set_observer_mode, | |
9672 | show_observer_mode, | |
9673 | &setlist, | |
9674 | &showlist); | |
c906108c | 9675 | } |