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" |
400b5eca | 59 | #include "gdbsupport/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" | |
06cc9596 | 67 | #include "gdbsupport/gdb_select.h" |
5b6d1e4f | 68 | #include <unordered_map> |
93b54c8e | 69 | #include "async-event.h" |
b161a60d SM |
70 | #include "gdbsupport/selftest.h" |
71 | #include "scoped-mock-context.h" | |
72 | #include "test-target.h" | |
ba988419 | 73 | #include "gdbsupport/common-debug.h" |
c906108c SS |
74 | |
75 | /* Prototypes for local functions */ | |
76 | ||
2ea28649 | 77 | static void sig_print_info (enum gdb_signal); |
c906108c | 78 | |
96baa820 | 79 | static void sig_print_header (void); |
c906108c | 80 | |
d83ad864 DB |
81 | static void follow_inferior_reset_breakpoints (void); |
82 | ||
c4464ade | 83 | static bool currently_stepping (struct thread_info *tp); |
a289b8f6 | 84 | |
2c03e5be | 85 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
86 | |
87 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
88 | ||
2484c66b UW |
89 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
90 | ||
c4464ade | 91 | static bool maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
8550d3b3 | 92 | |
aff4e175 AB |
93 | static void resume (gdb_signal sig); |
94 | ||
5b6d1e4f PA |
95 | static void wait_for_inferior (inferior *inf); |
96 | ||
372316f1 PA |
97 | /* Asynchronous signal handler registered as event loop source for |
98 | when we have pending events ready to be passed to the core. */ | |
99 | static struct async_event_handler *infrun_async_inferior_event_token; | |
100 | ||
101 | /* Stores whether infrun_async was previously enabled or disabled. | |
102 | Starts off as -1, indicating "never enabled/disabled". */ | |
103 | static int infrun_is_async = -1; | |
104 | ||
105 | /* See infrun.h. */ | |
106 | ||
1eb8556f SM |
107 | void |
108 | infrun_debug_printf_1 (const char *func_name, const char *fmt, ...) | |
109 | { | |
1eb8556f SM |
110 | va_list ap; |
111 | va_start (ap, fmt); | |
c426fddb | 112 | debug_prefixed_vprintf ("infrun", func_name, fmt, ap); |
1eb8556f | 113 | va_end (ap); |
1eb8556f SM |
114 | } |
115 | ||
116 | /* See infrun.h. */ | |
117 | ||
372316f1 PA |
118 | void |
119 | infrun_async (int enable) | |
120 | { | |
121 | if (infrun_is_async != enable) | |
122 | { | |
123 | infrun_is_async = enable; | |
124 | ||
1eb8556f | 125 | infrun_debug_printf ("enable=%d", enable); |
372316f1 PA |
126 | |
127 | if (enable) | |
128 | mark_async_event_handler (infrun_async_inferior_event_token); | |
129 | else | |
130 | clear_async_event_handler (infrun_async_inferior_event_token); | |
131 | } | |
132 | } | |
133 | ||
0b333c5e PA |
134 | /* See infrun.h. */ |
135 | ||
136 | void | |
137 | mark_infrun_async_event_handler (void) | |
138 | { | |
139 | mark_async_event_handler (infrun_async_inferior_event_token); | |
140 | } | |
141 | ||
5fbbeb29 CF |
142 | /* When set, stop the 'step' command if we enter a function which has |
143 | no line number information. The normal behavior is that we step | |
144 | over such function. */ | |
491144b5 | 145 | bool step_stop_if_no_debug = false; |
920d2a44 AC |
146 | static void |
147 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
148 | struct cmd_list_element *c, const char *value) | |
149 | { | |
150 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
151 | } | |
5fbbeb29 | 152 | |
b9f437de PA |
153 | /* proceed and normal_stop use this to notify the user when the |
154 | inferior stopped in a different thread than it had been running | |
155 | in. */ | |
96baa820 | 156 | |
39f77062 | 157 | static ptid_t previous_inferior_ptid; |
7a292a7a | 158 | |
07107ca6 LM |
159 | /* If set (default for legacy reasons), when following a fork, GDB |
160 | will detach from one of the fork branches, child or parent. | |
161 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
162 | setting. */ | |
163 | ||
491144b5 | 164 | static bool detach_fork = true; |
6c95b8df | 165 | |
491144b5 | 166 | bool debug_displaced = false; |
237fc4c9 PA |
167 | static void |
168 | show_debug_displaced (struct ui_file *file, int from_tty, | |
169 | struct cmd_list_element *c, const char *value) | |
170 | { | |
171 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
172 | } | |
173 | ||
ccce17b0 | 174 | unsigned int debug_infrun = 0; |
920d2a44 AC |
175 | static void |
176 | show_debug_infrun (struct ui_file *file, int from_tty, | |
177 | struct cmd_list_element *c, const char *value) | |
178 | { | |
179 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
180 | } | |
527159b7 | 181 | |
03583c20 UW |
182 | |
183 | /* Support for disabling address space randomization. */ | |
184 | ||
491144b5 | 185 | bool disable_randomization = true; |
03583c20 UW |
186 | |
187 | static void | |
188 | show_disable_randomization (struct ui_file *file, int from_tty, | |
189 | struct cmd_list_element *c, const char *value) | |
190 | { | |
191 | if (target_supports_disable_randomization ()) | |
192 | fprintf_filtered (file, | |
193 | _("Disabling randomization of debuggee's " | |
194 | "virtual address space is %s.\n"), | |
195 | value); | |
196 | else | |
197 | fputs_filtered (_("Disabling randomization of debuggee's " | |
198 | "virtual address space is unsupported on\n" | |
199 | "this platform.\n"), file); | |
200 | } | |
201 | ||
202 | static void | |
eb4c3f4a | 203 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
204 | struct cmd_list_element *c) |
205 | { | |
206 | if (!target_supports_disable_randomization ()) | |
207 | error (_("Disabling randomization of debuggee's " | |
208 | "virtual address space is unsupported on\n" | |
209 | "this platform.")); | |
210 | } | |
211 | ||
d32dc48e PA |
212 | /* User interface for non-stop mode. */ |
213 | ||
491144b5 CB |
214 | bool non_stop = false; |
215 | static bool non_stop_1 = false; | |
d32dc48e PA |
216 | |
217 | static void | |
eb4c3f4a | 218 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
219 | struct cmd_list_element *c) |
220 | { | |
55f6301a | 221 | if (target_has_execution ()) |
d32dc48e PA |
222 | { |
223 | non_stop_1 = non_stop; | |
224 | error (_("Cannot change this setting while the inferior is running.")); | |
225 | } | |
226 | ||
227 | non_stop = non_stop_1; | |
228 | } | |
229 | ||
230 | static void | |
231 | show_non_stop (struct ui_file *file, int from_tty, | |
232 | struct cmd_list_element *c, const char *value) | |
233 | { | |
234 | fprintf_filtered (file, | |
235 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
236 | value); | |
237 | } | |
238 | ||
d914c394 SS |
239 | /* "Observer mode" is somewhat like a more extreme version of |
240 | non-stop, in which all GDB operations that might affect the | |
241 | target's execution have been disabled. */ | |
242 | ||
491144b5 CB |
243 | bool observer_mode = false; |
244 | static bool observer_mode_1 = false; | |
d914c394 SS |
245 | |
246 | static void | |
eb4c3f4a | 247 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
248 | struct cmd_list_element *c) |
249 | { | |
55f6301a | 250 | if (target_has_execution ()) |
d914c394 SS |
251 | { |
252 | observer_mode_1 = observer_mode; | |
253 | error (_("Cannot change this setting while the inferior is running.")); | |
254 | } | |
255 | ||
256 | observer_mode = observer_mode_1; | |
257 | ||
258 | may_write_registers = !observer_mode; | |
259 | may_write_memory = !observer_mode; | |
260 | may_insert_breakpoints = !observer_mode; | |
261 | may_insert_tracepoints = !observer_mode; | |
262 | /* We can insert fast tracepoints in or out of observer mode, | |
263 | but enable them if we're going into this mode. */ | |
264 | if (observer_mode) | |
491144b5 | 265 | may_insert_fast_tracepoints = true; |
d914c394 SS |
266 | may_stop = !observer_mode; |
267 | update_target_permissions (); | |
268 | ||
269 | /* Going *into* observer mode we must force non-stop, then | |
270 | going out we leave it that way. */ | |
271 | if (observer_mode) | |
272 | { | |
d914c394 | 273 | pagination_enabled = 0; |
491144b5 | 274 | non_stop = non_stop_1 = true; |
d914c394 SS |
275 | } |
276 | ||
277 | if (from_tty) | |
278 | printf_filtered (_("Observer mode is now %s.\n"), | |
279 | (observer_mode ? "on" : "off")); | |
280 | } | |
281 | ||
282 | static void | |
283 | show_observer_mode (struct ui_file *file, int from_tty, | |
284 | struct cmd_list_element *c, const char *value) | |
285 | { | |
286 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
287 | } | |
288 | ||
289 | /* This updates the value of observer mode based on changes in | |
290 | permissions. Note that we are deliberately ignoring the values of | |
291 | may-write-registers and may-write-memory, since the user may have | |
292 | reason to enable these during a session, for instance to turn on a | |
293 | debugging-related global. */ | |
294 | ||
295 | void | |
296 | update_observer_mode (void) | |
297 | { | |
491144b5 CB |
298 | bool newval = (!may_insert_breakpoints |
299 | && !may_insert_tracepoints | |
300 | && may_insert_fast_tracepoints | |
301 | && !may_stop | |
302 | && non_stop); | |
d914c394 SS |
303 | |
304 | /* Let the user know if things change. */ | |
305 | if (newval != observer_mode) | |
306 | printf_filtered (_("Observer mode is now %s.\n"), | |
307 | (newval ? "on" : "off")); | |
308 | ||
309 | observer_mode = observer_mode_1 = newval; | |
310 | } | |
c2c6d25f | 311 | |
c906108c SS |
312 | /* Tables of how to react to signals; the user sets them. */ |
313 | ||
adc6a863 PA |
314 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
315 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
316 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 317 | |
ab04a2af TT |
318 | /* Table of signals that are registered with "catch signal". A |
319 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
320 | signal" command. */ |
321 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 322 | |
2455069d UW |
323 | /* Table of signals that the target may silently handle. |
324 | This is automatically determined from the flags above, | |
325 | and simply cached here. */ | |
adc6a863 | 326 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 327 | |
c906108c SS |
328 | #define SET_SIGS(nsigs,sigs,flags) \ |
329 | do { \ | |
330 | int signum = (nsigs); \ | |
331 | while (signum-- > 0) \ | |
332 | if ((sigs)[signum]) \ | |
333 | (flags)[signum] = 1; \ | |
334 | } while (0) | |
335 | ||
336 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
337 | do { \ | |
338 | int signum = (nsigs); \ | |
339 | while (signum-- > 0) \ | |
340 | if ((sigs)[signum]) \ | |
341 | (flags)[signum] = 0; \ | |
342 | } while (0) | |
343 | ||
9b224c5e PA |
344 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
345 | this function is to avoid exporting `signal_program'. */ | |
346 | ||
347 | void | |
348 | update_signals_program_target (void) | |
349 | { | |
adc6a863 | 350 | target_program_signals (signal_program); |
9b224c5e PA |
351 | } |
352 | ||
1777feb0 | 353 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 354 | |
edb3359d | 355 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
356 | |
357 | /* Command list pointer for the "stop" placeholder. */ | |
358 | ||
359 | static struct cmd_list_element *stop_command; | |
360 | ||
c906108c SS |
361 | /* Nonzero if we want to give control to the user when we're notified |
362 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 363 | int stop_on_solib_events; |
f9e14852 GB |
364 | |
365 | /* Enable or disable optional shared library event breakpoints | |
366 | as appropriate when the above flag is changed. */ | |
367 | ||
368 | static void | |
eb4c3f4a TT |
369 | set_stop_on_solib_events (const char *args, |
370 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
371 | { |
372 | update_solib_breakpoints (); | |
373 | } | |
374 | ||
920d2a44 AC |
375 | static void |
376 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
377 | struct cmd_list_element *c, const char *value) | |
378 | { | |
379 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
380 | value); | |
381 | } | |
c906108c | 382 | |
c4464ade | 383 | /* True after stop if current stack frame should be printed. */ |
c906108c | 384 | |
c4464ade | 385 | static bool stop_print_frame; |
c906108c | 386 | |
5b6d1e4f PA |
387 | /* This is a cached copy of the target/ptid/waitstatus of the last |
388 | event returned by target_wait()/deprecated_target_wait_hook(). | |
389 | This information is returned by get_last_target_status(). */ | |
390 | static process_stratum_target *target_last_proc_target; | |
39f77062 | 391 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
392 | static struct target_waitstatus target_last_waitstatus; |
393 | ||
4e1c45ea | 394 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 395 | |
53904c9e AC |
396 | static const char follow_fork_mode_child[] = "child"; |
397 | static const char follow_fork_mode_parent[] = "parent"; | |
398 | ||
40478521 | 399 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
400 | follow_fork_mode_child, |
401 | follow_fork_mode_parent, | |
402 | NULL | |
ef346e04 | 403 | }; |
c906108c | 404 | |
53904c9e | 405 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
406 | static void |
407 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
408 | struct cmd_list_element *c, const char *value) | |
409 | { | |
3e43a32a MS |
410 | fprintf_filtered (file, |
411 | _("Debugger response to a program " | |
412 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
413 | value); |
414 | } | |
c906108c SS |
415 | \f |
416 | ||
d83ad864 DB |
417 | /* Handle changes to the inferior list based on the type of fork, |
418 | which process is being followed, and whether the other process | |
419 | should be detached. On entry inferior_ptid must be the ptid of | |
420 | the fork parent. At return inferior_ptid is the ptid of the | |
421 | followed inferior. */ | |
422 | ||
5ab2fbf1 SM |
423 | static bool |
424 | follow_fork_inferior (bool follow_child, bool detach_fork) | |
d83ad864 DB |
425 | { |
426 | int has_vforked; | |
79639e11 | 427 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
428 | |
429 | has_vforked = (inferior_thread ()->pending_follow.kind | |
430 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
431 | parent_ptid = inferior_ptid; |
432 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
433 | |
434 | if (has_vforked | |
435 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 436 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
437 | && !(follow_child || detach_fork || sched_multi)) |
438 | { | |
439 | /* The parent stays blocked inside the vfork syscall until the | |
440 | child execs or exits. If we don't let the child run, then | |
441 | the parent stays blocked. If we're telling the parent to run | |
442 | in the foreground, the user will not be able to ctrl-c to get | |
443 | back the terminal, effectively hanging the debug session. */ | |
444 | fprintf_filtered (gdb_stderr, _("\ | |
445 | Can not resume the parent process over vfork in the foreground while\n\ | |
446 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
447 | \"set schedule-multiple\".\n")); | |
d83ad864 DB |
448 | return 1; |
449 | } | |
450 | ||
451 | if (!follow_child) | |
452 | { | |
453 | /* Detach new forked process? */ | |
454 | if (detach_fork) | |
455 | { | |
d83ad864 DB |
456 | /* Before detaching from the child, remove all breakpoints |
457 | from it. If we forked, then this has already been taken | |
458 | care of by infrun.c. If we vforked however, any | |
459 | breakpoint inserted in the parent is visible in the | |
460 | child, even those added while stopped in a vfork | |
461 | catchpoint. This will remove the breakpoints from the | |
462 | parent also, but they'll be reinserted below. */ | |
463 | if (has_vforked) | |
464 | { | |
465 | /* Keep breakpoints list in sync. */ | |
00431a78 | 466 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
467 | } |
468 | ||
f67c0c91 | 469 | if (print_inferior_events) |
d83ad864 | 470 | { |
8dd06f7a | 471 | /* Ensure that we have a process ptid. */ |
e99b03dc | 472 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 473 | |
223ffa71 | 474 | target_terminal::ours_for_output (); |
d83ad864 | 475 | fprintf_filtered (gdb_stdlog, |
f67c0c91 | 476 | _("[Detaching after %s from child %s]\n"), |
6f259a23 | 477 | has_vforked ? "vfork" : "fork", |
a068643d | 478 | target_pid_to_str (process_ptid).c_str ()); |
d83ad864 DB |
479 | } |
480 | } | |
481 | else | |
482 | { | |
483 | struct inferior *parent_inf, *child_inf; | |
d83ad864 DB |
484 | |
485 | /* Add process to GDB's tables. */ | |
e99b03dc | 486 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
487 | |
488 | parent_inf = current_inferior (); | |
489 | child_inf->attach_flag = parent_inf->attach_flag; | |
490 | copy_terminal_info (child_inf, parent_inf); | |
491 | child_inf->gdbarch = parent_inf->gdbarch; | |
492 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
493 | ||
5ed8105e | 494 | scoped_restore_current_pspace_and_thread restore_pspace_thread; |
d83ad864 | 495 | |
2a00d7ce | 496 | set_current_inferior (child_inf); |
5b6d1e4f | 497 | switch_to_no_thread (); |
d83ad864 | 498 | child_inf->symfile_flags = SYMFILE_NO_READ; |
5b6d1e4f | 499 | push_target (parent_inf->process_target ()); |
18493a00 PA |
500 | thread_info *child_thr |
501 | = add_thread_silent (child_inf->process_target (), child_ptid); | |
d83ad864 DB |
502 | |
503 | /* If this is a vfork child, then the address-space is | |
504 | shared with the parent. */ | |
505 | if (has_vforked) | |
506 | { | |
507 | child_inf->pspace = parent_inf->pspace; | |
508 | child_inf->aspace = parent_inf->aspace; | |
509 | ||
5b6d1e4f PA |
510 | exec_on_vfork (); |
511 | ||
d83ad864 DB |
512 | /* The parent will be frozen until the child is done |
513 | with the shared region. Keep track of the | |
514 | parent. */ | |
515 | child_inf->vfork_parent = parent_inf; | |
516 | child_inf->pending_detach = 0; | |
517 | parent_inf->vfork_child = child_inf; | |
518 | parent_inf->pending_detach = 0; | |
18493a00 PA |
519 | |
520 | /* Now that the inferiors and program spaces are all | |
521 | wired up, we can switch to the child thread (which | |
522 | switches inferior and program space too). */ | |
523 | switch_to_thread (child_thr); | |
d83ad864 DB |
524 | } |
525 | else | |
526 | { | |
527 | child_inf->aspace = new_address_space (); | |
564b1e3f | 528 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
529 | child_inf->removable = 1; |
530 | set_current_program_space (child_inf->pspace); | |
531 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
532 | ||
18493a00 PA |
533 | /* solib_create_inferior_hook relies on the current |
534 | thread. */ | |
535 | switch_to_thread (child_thr); | |
536 | ||
d83ad864 DB |
537 | /* Let the shared library layer (e.g., solib-svr4) learn |
538 | about this new process, relocate the cloned exec, pull | |
539 | in shared libraries, and install the solib event | |
540 | breakpoint. If a "cloned-VM" event was propagated | |
541 | better throughout the core, this wouldn't be | |
542 | required. */ | |
543 | solib_create_inferior_hook (0); | |
544 | } | |
d83ad864 DB |
545 | } |
546 | ||
547 | if (has_vforked) | |
548 | { | |
549 | struct inferior *parent_inf; | |
550 | ||
551 | parent_inf = current_inferior (); | |
552 | ||
553 | /* If we detached from the child, then we have to be careful | |
554 | to not insert breakpoints in the parent until the child | |
555 | is done with the shared memory region. However, if we're | |
556 | staying attached to the child, then we can and should | |
557 | insert breakpoints, so that we can debug it. A | |
558 | subsequent child exec or exit is enough to know when does | |
559 | the child stops using the parent's address space. */ | |
560 | parent_inf->waiting_for_vfork_done = detach_fork; | |
561 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
562 | } | |
563 | } | |
564 | else | |
565 | { | |
566 | /* Follow the child. */ | |
567 | struct inferior *parent_inf, *child_inf; | |
568 | struct program_space *parent_pspace; | |
569 | ||
f67c0c91 | 570 | if (print_inferior_events) |
d83ad864 | 571 | { |
f67c0c91 SDJ |
572 | std::string parent_pid = target_pid_to_str (parent_ptid); |
573 | std::string child_pid = target_pid_to_str (child_ptid); | |
574 | ||
223ffa71 | 575 | target_terminal::ours_for_output (); |
6f259a23 | 576 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
577 | _("[Attaching after %s %s to child %s]\n"), |
578 | parent_pid.c_str (), | |
6f259a23 | 579 | has_vforked ? "vfork" : "fork", |
f67c0c91 | 580 | child_pid.c_str ()); |
d83ad864 DB |
581 | } |
582 | ||
583 | /* Add the new inferior first, so that the target_detach below | |
584 | doesn't unpush the target. */ | |
585 | ||
e99b03dc | 586 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
587 | |
588 | parent_inf = current_inferior (); | |
589 | child_inf->attach_flag = parent_inf->attach_flag; | |
590 | copy_terminal_info (child_inf, parent_inf); | |
591 | child_inf->gdbarch = parent_inf->gdbarch; | |
592 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
593 | ||
594 | parent_pspace = parent_inf->pspace; | |
595 | ||
5b6d1e4f | 596 | process_stratum_target *target = parent_inf->process_target (); |
d83ad864 | 597 | |
5b6d1e4f PA |
598 | { |
599 | /* Hold a strong reference to the target while (maybe) | |
600 | detaching the parent. Otherwise detaching could close the | |
601 | target. */ | |
602 | auto target_ref = target_ops_ref::new_reference (target); | |
603 | ||
604 | /* If we're vforking, we want to hold on to the parent until | |
605 | the child exits or execs. At child exec or exit time we | |
606 | can remove the old breakpoints from the parent and detach | |
607 | or resume debugging it. Otherwise, detach the parent now; | |
608 | we'll want to reuse it's program/address spaces, but we | |
609 | can't set them to the child before removing breakpoints | |
610 | from the parent, otherwise, the breakpoints module could | |
611 | decide to remove breakpoints from the wrong process (since | |
612 | they'd be assigned to the same address space). */ | |
613 | ||
614 | if (has_vforked) | |
615 | { | |
616 | gdb_assert (child_inf->vfork_parent == NULL); | |
617 | gdb_assert (parent_inf->vfork_child == NULL); | |
618 | child_inf->vfork_parent = parent_inf; | |
619 | child_inf->pending_detach = 0; | |
620 | parent_inf->vfork_child = child_inf; | |
621 | parent_inf->pending_detach = detach_fork; | |
622 | parent_inf->waiting_for_vfork_done = 0; | |
623 | } | |
624 | else if (detach_fork) | |
625 | { | |
626 | if (print_inferior_events) | |
627 | { | |
628 | /* Ensure that we have a process ptid. */ | |
629 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
630 | ||
631 | target_terminal::ours_for_output (); | |
632 | fprintf_filtered (gdb_stdlog, | |
633 | _("[Detaching after fork from " | |
634 | "parent %s]\n"), | |
635 | target_pid_to_str (process_ptid).c_str ()); | |
636 | } | |
8dd06f7a | 637 | |
5b6d1e4f PA |
638 | target_detach (parent_inf, 0); |
639 | parent_inf = NULL; | |
640 | } | |
6f259a23 | 641 | |
5b6d1e4f | 642 | /* Note that the detach above makes PARENT_INF dangling. */ |
d83ad864 | 643 | |
5b6d1e4f PA |
644 | /* Add the child thread to the appropriate lists, and switch |
645 | to this new thread, before cloning the program space, and | |
646 | informing the solib layer about this new process. */ | |
d83ad864 | 647 | |
5b6d1e4f PA |
648 | set_current_inferior (child_inf); |
649 | push_target (target); | |
650 | } | |
d83ad864 | 651 | |
18493a00 | 652 | thread_info *child_thr = add_thread_silent (target, child_ptid); |
d83ad864 DB |
653 | |
654 | /* If this is a vfork child, then the address-space is shared | |
655 | with the parent. If we detached from the parent, then we can | |
656 | reuse the parent's program/address spaces. */ | |
657 | if (has_vforked || detach_fork) | |
658 | { | |
659 | child_inf->pspace = parent_pspace; | |
660 | child_inf->aspace = child_inf->pspace->aspace; | |
5b6d1e4f PA |
661 | |
662 | exec_on_vfork (); | |
d83ad864 DB |
663 | } |
664 | else | |
665 | { | |
666 | child_inf->aspace = new_address_space (); | |
564b1e3f | 667 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
668 | child_inf->removable = 1; |
669 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
670 | set_current_program_space (child_inf->pspace); | |
671 | clone_program_space (child_inf->pspace, parent_pspace); | |
672 | ||
673 | /* Let the shared library layer (e.g., solib-svr4) learn | |
674 | about this new process, relocate the cloned exec, pull in | |
675 | shared libraries, and install the solib event breakpoint. | |
676 | If a "cloned-VM" event was propagated better throughout | |
677 | the core, this wouldn't be required. */ | |
678 | solib_create_inferior_hook (0); | |
679 | } | |
18493a00 PA |
680 | |
681 | switch_to_thread (child_thr); | |
d83ad864 DB |
682 | } |
683 | ||
684 | return target_follow_fork (follow_child, detach_fork); | |
685 | } | |
686 | ||
e58b0e63 PA |
687 | /* Tell the target to follow the fork we're stopped at. Returns true |
688 | if the inferior should be resumed; false, if the target for some | |
689 | reason decided it's best not to resume. */ | |
690 | ||
5ab2fbf1 SM |
691 | static bool |
692 | follow_fork () | |
c906108c | 693 | { |
5ab2fbf1 SM |
694 | bool follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
695 | bool should_resume = true; | |
e58b0e63 PA |
696 | struct thread_info *tp; |
697 | ||
698 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
699 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
700 | parent thread structure's run control related fields, not just these. |
701 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
702 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 703 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
704 | CORE_ADDR step_range_start = 0; |
705 | CORE_ADDR step_range_end = 0; | |
bf4cb9be TV |
706 | int current_line = 0; |
707 | symtab *current_symtab = NULL; | |
4e3990f4 | 708 | struct frame_id step_frame_id = { 0 }; |
8980e177 | 709 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
710 | |
711 | if (!non_stop) | |
712 | { | |
5b6d1e4f | 713 | process_stratum_target *wait_target; |
e58b0e63 PA |
714 | ptid_t wait_ptid; |
715 | struct target_waitstatus wait_status; | |
716 | ||
717 | /* Get the last target status returned by target_wait(). */ | |
5b6d1e4f | 718 | get_last_target_status (&wait_target, &wait_ptid, &wait_status); |
e58b0e63 PA |
719 | |
720 | /* If not stopped at a fork event, then there's nothing else to | |
721 | do. */ | |
722 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
723 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
724 | return 1; | |
725 | ||
726 | /* Check if we switched over from WAIT_PTID, since the event was | |
727 | reported. */ | |
00431a78 | 728 | if (wait_ptid != minus_one_ptid |
5b6d1e4f PA |
729 | && (current_inferior ()->process_target () != wait_target |
730 | || inferior_ptid != wait_ptid)) | |
e58b0e63 PA |
731 | { |
732 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
733 | target to follow it (in either direction). We'll | |
734 | afterwards refuse to resume, and inform the user what | |
735 | happened. */ | |
5b6d1e4f | 736 | thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid); |
00431a78 | 737 | switch_to_thread (wait_thread); |
5ab2fbf1 | 738 | should_resume = false; |
e58b0e63 PA |
739 | } |
740 | } | |
741 | ||
742 | tp = inferior_thread (); | |
743 | ||
744 | /* If there were any forks/vforks that were caught and are now to be | |
745 | followed, then do so now. */ | |
746 | switch (tp->pending_follow.kind) | |
747 | { | |
748 | case TARGET_WAITKIND_FORKED: | |
749 | case TARGET_WAITKIND_VFORKED: | |
750 | { | |
751 | ptid_t parent, child; | |
752 | ||
753 | /* If the user did a next/step, etc, over a fork call, | |
754 | preserve the stepping state in the fork child. */ | |
755 | if (follow_child && should_resume) | |
756 | { | |
8358c15c JK |
757 | step_resume_breakpoint = clone_momentary_breakpoint |
758 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
759 | step_range_start = tp->control.step_range_start; |
760 | step_range_end = tp->control.step_range_end; | |
bf4cb9be TV |
761 | current_line = tp->current_line; |
762 | current_symtab = tp->current_symtab; | |
16c381f0 | 763 | step_frame_id = tp->control.step_frame_id; |
186c406b TT |
764 | exception_resume_breakpoint |
765 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 766 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
767 | |
768 | /* For now, delete the parent's sr breakpoint, otherwise, | |
769 | parent/child sr breakpoints are considered duplicates, | |
770 | and the child version will not be installed. Remove | |
771 | this when the breakpoints module becomes aware of | |
772 | inferiors and address spaces. */ | |
773 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
774 | tp->control.step_range_start = 0; |
775 | tp->control.step_range_end = 0; | |
776 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 777 | delete_exception_resume_breakpoint (tp); |
8980e177 | 778 | tp->thread_fsm = NULL; |
e58b0e63 PA |
779 | } |
780 | ||
781 | parent = inferior_ptid; | |
782 | child = tp->pending_follow.value.related_pid; | |
783 | ||
5b6d1e4f | 784 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
785 | /* Set up inferior(s) as specified by the caller, and tell the |
786 | target to do whatever is necessary to follow either parent | |
787 | or child. */ | |
788 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
789 | { |
790 | /* Target refused to follow, or there's some other reason | |
791 | we shouldn't resume. */ | |
792 | should_resume = 0; | |
793 | } | |
794 | else | |
795 | { | |
796 | /* This pending follow fork event is now handled, one way | |
797 | or another. The previous selected thread may be gone | |
798 | from the lists by now, but if it is still around, need | |
799 | to clear the pending follow request. */ | |
5b6d1e4f | 800 | tp = find_thread_ptid (parent_targ, parent); |
e58b0e63 PA |
801 | if (tp) |
802 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
803 | ||
804 | /* This makes sure we don't try to apply the "Switched | |
805 | over from WAIT_PID" logic above. */ | |
806 | nullify_last_target_wait_ptid (); | |
807 | ||
1777feb0 | 808 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
809 | if (follow_child) |
810 | { | |
5b6d1e4f | 811 | thread_info *child_thr = find_thread_ptid (parent_targ, child); |
00431a78 | 812 | switch_to_thread (child_thr); |
e58b0e63 PA |
813 | |
814 | /* ... and preserve the stepping state, in case the | |
815 | user was stepping over the fork call. */ | |
816 | if (should_resume) | |
817 | { | |
818 | tp = inferior_thread (); | |
8358c15c JK |
819 | tp->control.step_resume_breakpoint |
820 | = step_resume_breakpoint; | |
16c381f0 JK |
821 | tp->control.step_range_start = step_range_start; |
822 | tp->control.step_range_end = step_range_end; | |
bf4cb9be TV |
823 | tp->current_line = current_line; |
824 | tp->current_symtab = current_symtab; | |
16c381f0 | 825 | tp->control.step_frame_id = step_frame_id; |
186c406b TT |
826 | tp->control.exception_resume_breakpoint |
827 | = exception_resume_breakpoint; | |
8980e177 | 828 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
829 | } |
830 | else | |
831 | { | |
832 | /* If we get here, it was because we're trying to | |
833 | resume from a fork catchpoint, but, the user | |
834 | has switched threads away from the thread that | |
835 | forked. In that case, the resume command | |
836 | issued is most likely not applicable to the | |
837 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 838 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 839 | "before following fork child.")); |
e58b0e63 PA |
840 | } |
841 | ||
842 | /* Reset breakpoints in the child as appropriate. */ | |
843 | follow_inferior_reset_breakpoints (); | |
844 | } | |
e58b0e63 PA |
845 | } |
846 | } | |
847 | break; | |
848 | case TARGET_WAITKIND_SPURIOUS: | |
849 | /* Nothing to follow. */ | |
850 | break; | |
851 | default: | |
852 | internal_error (__FILE__, __LINE__, | |
853 | "Unexpected pending_follow.kind %d\n", | |
854 | tp->pending_follow.kind); | |
855 | break; | |
856 | } | |
c906108c | 857 | |
e58b0e63 | 858 | return should_resume; |
c906108c SS |
859 | } |
860 | ||
d83ad864 | 861 | static void |
6604731b | 862 | follow_inferior_reset_breakpoints (void) |
c906108c | 863 | { |
4e1c45ea PA |
864 | struct thread_info *tp = inferior_thread (); |
865 | ||
6604731b DJ |
866 | /* Was there a step_resume breakpoint? (There was if the user |
867 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
868 | thread number. Cloned step_resume breakpoints are disabled on |
869 | creation, so enable it here now that it is associated with the | |
870 | correct thread. | |
6604731b DJ |
871 | |
872 | step_resumes are a form of bp that are made to be per-thread. | |
873 | Since we created the step_resume bp when the parent process | |
874 | was being debugged, and now are switching to the child process, | |
875 | from the breakpoint package's viewpoint, that's a switch of | |
876 | "threads". We must update the bp's notion of which thread | |
877 | it is for, or it'll be ignored when it triggers. */ | |
878 | ||
8358c15c | 879 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
880 | { |
881 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
882 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
883 | } | |
6604731b | 884 | |
a1aa2221 | 885 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 886 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
887 | { |
888 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
889 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
890 | } | |
186c406b | 891 | |
6604731b DJ |
892 | /* Reinsert all breakpoints in the child. The user may have set |
893 | breakpoints after catching the fork, in which case those | |
894 | were never set in the child, but only in the parent. This makes | |
895 | sure the inserted breakpoints match the breakpoint list. */ | |
896 | ||
897 | breakpoint_re_set (); | |
898 | insert_breakpoints (); | |
c906108c | 899 | } |
c906108c | 900 | |
6c95b8df PA |
901 | /* The child has exited or execed: resume threads of the parent the |
902 | user wanted to be executing. */ | |
903 | ||
904 | static int | |
905 | proceed_after_vfork_done (struct thread_info *thread, | |
906 | void *arg) | |
907 | { | |
908 | int pid = * (int *) arg; | |
909 | ||
00431a78 PA |
910 | if (thread->ptid.pid () == pid |
911 | && thread->state == THREAD_RUNNING | |
912 | && !thread->executing | |
6c95b8df | 913 | && !thread->stop_requested |
a493e3e2 | 914 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df | 915 | { |
1eb8556f SM |
916 | infrun_debug_printf ("resuming vfork parent thread %s", |
917 | target_pid_to_str (thread->ptid).c_str ()); | |
6c95b8df | 918 | |
00431a78 | 919 | switch_to_thread (thread); |
70509625 | 920 | clear_proceed_status (0); |
64ce06e4 | 921 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
922 | } |
923 | ||
924 | return 0; | |
925 | } | |
926 | ||
927 | /* Called whenever we notice an exec or exit event, to handle | |
928 | detaching or resuming a vfork parent. */ | |
929 | ||
930 | static void | |
931 | handle_vfork_child_exec_or_exit (int exec) | |
932 | { | |
933 | struct inferior *inf = current_inferior (); | |
934 | ||
935 | if (inf->vfork_parent) | |
936 | { | |
937 | int resume_parent = -1; | |
938 | ||
939 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
940 | between the parent and the child. Break the bonds. */ |
941 | inferior *vfork_parent = inf->vfork_parent; | |
942 | inf->vfork_parent->vfork_child = NULL; | |
943 | inf->vfork_parent = NULL; | |
6c95b8df | 944 | |
b73715df TV |
945 | /* If the user wanted to detach from the parent, now is the |
946 | time. */ | |
947 | if (vfork_parent->pending_detach) | |
6c95b8df | 948 | { |
6c95b8df PA |
949 | struct program_space *pspace; |
950 | struct address_space *aspace; | |
951 | ||
1777feb0 | 952 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 953 | |
b73715df | 954 | vfork_parent->pending_detach = 0; |
68c9da30 | 955 | |
18493a00 | 956 | scoped_restore_current_pspace_and_thread restore_thread; |
6c95b8df PA |
957 | |
958 | /* We're letting loose of the parent. */ | |
18493a00 | 959 | thread_info *tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 960 | switch_to_thread (tp); |
6c95b8df PA |
961 | |
962 | /* We're about to detach from the parent, which implicitly | |
963 | removes breakpoints from its address space. There's a | |
964 | catch here: we want to reuse the spaces for the child, | |
965 | but, parent/child are still sharing the pspace at this | |
966 | point, although the exec in reality makes the kernel give | |
967 | the child a fresh set of new pages. The problem here is | |
968 | that the breakpoints module being unaware of this, would | |
969 | likely chose the child process to write to the parent | |
970 | address space. Swapping the child temporarily away from | |
971 | the spaces has the desired effect. Yes, this is "sort | |
972 | of" a hack. */ | |
973 | ||
974 | pspace = inf->pspace; | |
975 | aspace = inf->aspace; | |
976 | inf->aspace = NULL; | |
977 | inf->pspace = NULL; | |
978 | ||
f67c0c91 | 979 | if (print_inferior_events) |
6c95b8df | 980 | { |
a068643d | 981 | std::string pidstr |
b73715df | 982 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 983 | |
223ffa71 | 984 | target_terminal::ours_for_output (); |
6c95b8df PA |
985 | |
986 | if (exec) | |
6f259a23 DB |
987 | { |
988 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 989 | _("[Detaching vfork parent %s " |
a068643d | 990 | "after child exec]\n"), pidstr.c_str ()); |
6f259a23 | 991 | } |
6c95b8df | 992 | else |
6f259a23 DB |
993 | { |
994 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 995 | _("[Detaching vfork parent %s " |
a068643d | 996 | "after child exit]\n"), pidstr.c_str ()); |
6f259a23 | 997 | } |
6c95b8df PA |
998 | } |
999 | ||
b73715df | 1000 | target_detach (vfork_parent, 0); |
6c95b8df PA |
1001 | |
1002 | /* Put it back. */ | |
1003 | inf->pspace = pspace; | |
1004 | inf->aspace = aspace; | |
6c95b8df PA |
1005 | } |
1006 | else if (exec) | |
1007 | { | |
1008 | /* We're staying attached to the parent, so, really give the | |
1009 | child a new address space. */ | |
564b1e3f | 1010 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
1011 | inf->aspace = inf->pspace->aspace; |
1012 | inf->removable = 1; | |
1013 | set_current_program_space (inf->pspace); | |
1014 | ||
b73715df | 1015 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1016 | } |
1017 | else | |
1018 | { | |
6c95b8df PA |
1019 | /* If this is a vfork child exiting, then the pspace and |
1020 | aspaces were shared with the parent. Since we're | |
1021 | reporting the process exit, we'll be mourning all that is | |
1022 | found in the address space, and switching to null_ptid, | |
1023 | preparing to start a new inferior. But, since we don't | |
1024 | want to clobber the parent's address/program spaces, we | |
1025 | go ahead and create a new one for this exiting | |
1026 | inferior. */ | |
1027 | ||
18493a00 | 1028 | /* Switch to no-thread while running clone_program_space, so |
5ed8105e PA |
1029 | that clone_program_space doesn't want to read the |
1030 | selected frame of a dead process. */ | |
18493a00 PA |
1031 | scoped_restore_current_thread restore_thread; |
1032 | switch_to_no_thread (); | |
6c95b8df | 1033 | |
53af73bf PA |
1034 | inf->pspace = new program_space (maybe_new_address_space ()); |
1035 | inf->aspace = inf->pspace->aspace; | |
1036 | set_current_program_space (inf->pspace); | |
6c95b8df | 1037 | inf->removable = 1; |
7dcd53a0 | 1038 | inf->symfile_flags = SYMFILE_NO_READ; |
53af73bf | 1039 | clone_program_space (inf->pspace, vfork_parent->pspace); |
6c95b8df | 1040 | |
b73715df | 1041 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1042 | } |
1043 | ||
6c95b8df PA |
1044 | gdb_assert (current_program_space == inf->pspace); |
1045 | ||
1046 | if (non_stop && resume_parent != -1) | |
1047 | { | |
1048 | /* If the user wanted the parent to be running, let it go | |
1049 | free now. */ | |
5ed8105e | 1050 | scoped_restore_current_thread restore_thread; |
6c95b8df | 1051 | |
1eb8556f SM |
1052 | infrun_debug_printf ("resuming vfork parent process %d", |
1053 | resume_parent); | |
6c95b8df PA |
1054 | |
1055 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1056 | } |
1057 | } | |
1058 | } | |
1059 | ||
eb6c553b | 1060 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1061 | |
1062 | static const char follow_exec_mode_new[] = "new"; | |
1063 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1064 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1065 | { |
1066 | follow_exec_mode_new, | |
1067 | follow_exec_mode_same, | |
1068 | NULL, | |
1069 | }; | |
1070 | ||
1071 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1072 | static void | |
1073 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1074 | struct cmd_list_element *c, const char *value) | |
1075 | { | |
1076 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1077 | } | |
1078 | ||
ecf45d2c | 1079 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1080 | |
c906108c | 1081 | static void |
4ca51187 | 1082 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1083 | { |
6c95b8df | 1084 | struct inferior *inf = current_inferior (); |
e99b03dc | 1085 | int pid = ptid.pid (); |
94585166 | 1086 | ptid_t process_ptid; |
7a292a7a | 1087 | |
65d2b333 PW |
1088 | /* Switch terminal for any messages produced e.g. by |
1089 | breakpoint_re_set. */ | |
1090 | target_terminal::ours_for_output (); | |
1091 | ||
c906108c SS |
1092 | /* This is an exec event that we actually wish to pay attention to. |
1093 | Refresh our symbol table to the newly exec'd program, remove any | |
1094 | momentary bp's, etc. | |
1095 | ||
1096 | If there are breakpoints, they aren't really inserted now, | |
1097 | since the exec() transformed our inferior into a fresh set | |
1098 | of instructions. | |
1099 | ||
1100 | We want to preserve symbolic breakpoints on the list, since | |
1101 | we have hopes that they can be reset after the new a.out's | |
1102 | symbol table is read. | |
1103 | ||
1104 | However, any "raw" breakpoints must be removed from the list | |
1105 | (e.g., the solib bp's), since their address is probably invalid | |
1106 | now. | |
1107 | ||
1108 | And, we DON'T want to call delete_breakpoints() here, since | |
1109 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1110 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1111 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1112 | |
1113 | mark_breakpoints_out (); | |
1114 | ||
95e50b27 PA |
1115 | /* The target reports the exec event to the main thread, even if |
1116 | some other thread does the exec, and even if the main thread was | |
1117 | stopped or already gone. We may still have non-leader threads of | |
1118 | the process on our list. E.g., on targets that don't have thread | |
1119 | exit events (like remote); or on native Linux in non-stop mode if | |
1120 | there were only two threads in the inferior and the non-leader | |
1121 | one is the one that execs (and nothing forces an update of the | |
1122 | thread list up to here). When debugging remotely, it's best to | |
1123 | avoid extra traffic, when possible, so avoid syncing the thread | |
1124 | list with the target, and instead go ahead and delete all threads | |
1125 | of the process but one that reported the event. Note this must | |
1126 | be done before calling update_breakpoints_after_exec, as | |
1127 | otherwise clearing the threads' resources would reference stale | |
1128 | thread breakpoints -- it may have been one of these threads that | |
1129 | stepped across the exec. We could just clear their stepping | |
1130 | states, but as long as we're iterating, might as well delete | |
1131 | them. Deleting them now rather than at the next user-visible | |
1132 | stop provides a nicer sequence of events for user and MI | |
1133 | notifications. */ | |
08036331 | 1134 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1135 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1136 | delete_thread (th); |
95e50b27 PA |
1137 | |
1138 | /* We also need to clear any left over stale state for the | |
1139 | leader/event thread. E.g., if there was any step-resume | |
1140 | breakpoint or similar, it's gone now. We cannot truly | |
1141 | step-to-next statement through an exec(). */ | |
08036331 | 1142 | thread_info *th = inferior_thread (); |
8358c15c | 1143 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1144 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1145 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1146 | th->control.step_range_start = 0; |
1147 | th->control.step_range_end = 0; | |
c906108c | 1148 | |
95e50b27 PA |
1149 | /* The user may have had the main thread held stopped in the |
1150 | previous image (e.g., schedlock on, or non-stop). Release | |
1151 | it now. */ | |
a75724bc PA |
1152 | th->stop_requested = 0; |
1153 | ||
95e50b27 PA |
1154 | update_breakpoints_after_exec (); |
1155 | ||
1777feb0 | 1156 | /* What is this a.out's name? */ |
f2907e49 | 1157 | process_ptid = ptid_t (pid); |
6c95b8df | 1158 | printf_unfiltered (_("%s is executing new program: %s\n"), |
a068643d | 1159 | target_pid_to_str (process_ptid).c_str (), |
ecf45d2c | 1160 | exec_file_target); |
c906108c SS |
1161 | |
1162 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1163 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1164 | |
6ca15a4b | 1165 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1166 | |
797bc1cb TT |
1167 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1168 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1169 | |
ecf45d2c SL |
1170 | /* If we were unable to map the executable target pathname onto a host |
1171 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1172 | is confusing. Maybe it would even be better to stop at this point | |
1173 | so that the user can specify a file manually before continuing. */ | |
1174 | if (exec_file_host == NULL) | |
1175 | warning (_("Could not load symbols for executable %s.\n" | |
1176 | "Do you need \"set sysroot\"?"), | |
1177 | exec_file_target); | |
c906108c | 1178 | |
cce9b6bf PA |
1179 | /* Reset the shared library package. This ensures that we get a |
1180 | shlib event when the child reaches "_start", at which point the | |
1181 | dld will have had a chance to initialize the child. */ | |
1182 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1183 | we don't want those to be satisfied by the libraries of the | |
1184 | previous incarnation of this process. */ | |
1185 | no_shared_libraries (NULL, 0); | |
1186 | ||
6c95b8df PA |
1187 | if (follow_exec_mode_string == follow_exec_mode_new) |
1188 | { | |
6c95b8df PA |
1189 | /* The user wants to keep the old inferior and program spaces |
1190 | around. Create a new fresh one, and switch to it. */ | |
1191 | ||
35ed81d4 SM |
1192 | /* Do exit processing for the original inferior before setting the new |
1193 | inferior's pid. Having two inferiors with the same pid would confuse | |
1194 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1195 | old to the new inferior. */ | |
1196 | inf = add_inferior_with_spaces (); | |
1197 | swap_terminal_info (inf, current_inferior ()); | |
057302ce | 1198 | exit_inferior_silent (current_inferior ()); |
17d8546e | 1199 | |
94585166 | 1200 | inf->pid = pid; |
ecf45d2c | 1201 | target_follow_exec (inf, exec_file_target); |
6c95b8df | 1202 | |
5b6d1e4f PA |
1203 | inferior *org_inferior = current_inferior (); |
1204 | switch_to_inferior_no_thread (inf); | |
1205 | push_target (org_inferior->process_target ()); | |
1206 | thread_info *thr = add_thread (inf->process_target (), ptid); | |
1207 | switch_to_thread (thr); | |
6c95b8df | 1208 | } |
9107fc8d PA |
1209 | else |
1210 | { | |
1211 | /* The old description may no longer be fit for the new image. | |
1212 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1213 | old description; we'll read a new one below. No need to do | |
1214 | this on "follow-exec-mode new", as the old inferior stays | |
1215 | around (its description is later cleared/refetched on | |
1216 | restart). */ | |
1217 | target_clear_description (); | |
1218 | } | |
6c95b8df PA |
1219 | |
1220 | gdb_assert (current_program_space == inf->pspace); | |
1221 | ||
ecf45d2c SL |
1222 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1223 | because the proper displacement for a PIE (Position Independent | |
1224 | Executable) main symbol file will only be computed by | |
1225 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1226 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1227 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1228 | |
9107fc8d PA |
1229 | /* If the target can specify a description, read it. Must do this |
1230 | after flipping to the new executable (because the target supplied | |
1231 | description must be compatible with the executable's | |
1232 | architecture, and the old executable may e.g., be 32-bit, while | |
1233 | the new one 64-bit), and before anything involving memory or | |
1234 | registers. */ | |
1235 | target_find_description (); | |
1236 | ||
268a4a75 | 1237 | solib_create_inferior_hook (0); |
c906108c | 1238 | |
32495661 | 1239 | jit_inferior_created_hook (inf); |
4efc6507 | 1240 | |
c1e56572 JK |
1241 | breakpoint_re_set (); |
1242 | ||
c906108c SS |
1243 | /* Reinsert all breakpoints. (Those which were symbolic have |
1244 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1245 | to symbol_file_command...). */ |
c906108c SS |
1246 | insert_breakpoints (); |
1247 | ||
1248 | /* The next resume of this inferior should bring it to the shlib | |
1249 | startup breakpoints. (If the user had also set bp's on | |
1250 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1251 | matically get reset there in the new process.). */ |
c906108c SS |
1252 | } |
1253 | ||
c2829269 PA |
1254 | /* The queue of threads that need to do a step-over operation to get |
1255 | past e.g., a breakpoint. What technique is used to step over the | |
1256 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1257 | same queue, to maintain rough temporal order of execution, in order | |
1258 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1259 | constantly stepping the same couple threads past their breakpoints | |
1260 | over and over, if the single-step finish fast enough. */ | |
1261 | struct thread_info *step_over_queue_head; | |
1262 | ||
6c4cfb24 PA |
1263 | /* Bit flags indicating what the thread needs to step over. */ |
1264 | ||
8d297bbf | 1265 | enum step_over_what_flag |
6c4cfb24 PA |
1266 | { |
1267 | /* Step over a breakpoint. */ | |
1268 | STEP_OVER_BREAKPOINT = 1, | |
1269 | ||
1270 | /* Step past a non-continuable watchpoint, in order to let the | |
1271 | instruction execute so we can evaluate the watchpoint | |
1272 | expression. */ | |
1273 | STEP_OVER_WATCHPOINT = 2 | |
1274 | }; | |
8d297bbf | 1275 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1276 | |
963f9c80 | 1277 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1278 | |
1279 | struct step_over_info | |
1280 | { | |
963f9c80 PA |
1281 | /* If we're stepping past a breakpoint, this is the address space |
1282 | and address of the instruction the breakpoint is set at. We'll | |
1283 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1284 | non-NULL. */ | |
8b86c959 | 1285 | const address_space *aspace; |
31e77af2 | 1286 | CORE_ADDR address; |
963f9c80 PA |
1287 | |
1288 | /* The instruction being stepped over triggers a nonsteppable | |
1289 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1290 | int nonsteppable_watchpoint_p; | |
21edc42f YQ |
1291 | |
1292 | /* The thread's global number. */ | |
1293 | int thread; | |
31e77af2 PA |
1294 | }; |
1295 | ||
1296 | /* The step-over info of the location that is being stepped over. | |
1297 | ||
1298 | Note that with async/breakpoint always-inserted mode, a user might | |
1299 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1300 | being stepped over. As setting a new breakpoint inserts all | |
1301 | breakpoints, we need to make sure the breakpoint being stepped over | |
1302 | isn't inserted then. We do that by only clearing the step-over | |
1303 | info when the step-over is actually finished (or aborted). | |
1304 | ||
1305 | Presently GDB can only step over one breakpoint at any given time. | |
1306 | Given threads that can't run code in the same address space as the | |
1307 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1308 | to step-over at most one breakpoint per address space (so this info | |
1309 | could move to the address space object if/when GDB is extended). | |
1310 | The set of breakpoints being stepped over will normally be much | |
1311 | smaller than the set of all breakpoints, so a flag in the | |
1312 | breakpoint location structure would be wasteful. A separate list | |
1313 | also saves complexity and run-time, as otherwise we'd have to go | |
1314 | through all breakpoint locations clearing their flag whenever we | |
1315 | start a new sequence. Similar considerations weigh against storing | |
1316 | this info in the thread object. Plus, not all step overs actually | |
1317 | have breakpoint locations -- e.g., stepping past a single-step | |
1318 | breakpoint, or stepping to complete a non-continuable | |
1319 | watchpoint. */ | |
1320 | static struct step_over_info step_over_info; | |
1321 | ||
1322 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1323 | stepping over. |
1324 | N.B. We record the aspace and address now, instead of say just the thread, | |
1325 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1326 | |
1327 | static void | |
8b86c959 | 1328 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1329 | int nonsteppable_watchpoint_p, |
1330 | int thread) | |
31e77af2 PA |
1331 | { |
1332 | step_over_info.aspace = aspace; | |
1333 | step_over_info.address = address; | |
963f9c80 | 1334 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1335 | step_over_info.thread = thread; |
31e77af2 PA |
1336 | } |
1337 | ||
1338 | /* Called when we're not longer stepping over a breakpoint / an | |
1339 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1340 | ||
1341 | static void | |
1342 | clear_step_over_info (void) | |
1343 | { | |
1eb8556f | 1344 | infrun_debug_printf ("clearing step over info"); |
31e77af2 PA |
1345 | step_over_info.aspace = NULL; |
1346 | step_over_info.address = 0; | |
963f9c80 | 1347 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1348 | step_over_info.thread = -1; |
31e77af2 PA |
1349 | } |
1350 | ||
7f89fd65 | 1351 | /* See infrun.h. */ |
31e77af2 PA |
1352 | |
1353 | int | |
1354 | stepping_past_instruction_at (struct address_space *aspace, | |
1355 | CORE_ADDR address) | |
1356 | { | |
1357 | return (step_over_info.aspace != NULL | |
1358 | && breakpoint_address_match (aspace, address, | |
1359 | step_over_info.aspace, | |
1360 | step_over_info.address)); | |
1361 | } | |
1362 | ||
963f9c80 PA |
1363 | /* See infrun.h. */ |
1364 | ||
21edc42f YQ |
1365 | int |
1366 | thread_is_stepping_over_breakpoint (int thread) | |
1367 | { | |
1368 | return (step_over_info.thread != -1 | |
1369 | && thread == step_over_info.thread); | |
1370 | } | |
1371 | ||
1372 | /* See infrun.h. */ | |
1373 | ||
963f9c80 PA |
1374 | int |
1375 | stepping_past_nonsteppable_watchpoint (void) | |
1376 | { | |
1377 | return step_over_info.nonsteppable_watchpoint_p; | |
1378 | } | |
1379 | ||
6cc83d2a PA |
1380 | /* Returns true if step-over info is valid. */ |
1381 | ||
c4464ade | 1382 | static bool |
6cc83d2a PA |
1383 | step_over_info_valid_p (void) |
1384 | { | |
963f9c80 PA |
1385 | return (step_over_info.aspace != NULL |
1386 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1387 | } |
1388 | ||
c906108c | 1389 | \f |
237fc4c9 PA |
1390 | /* Displaced stepping. */ |
1391 | ||
1392 | /* In non-stop debugging mode, we must take special care to manage | |
1393 | breakpoints properly; in particular, the traditional strategy for | |
1394 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1395 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1396 | breakpoint it has hit while ensuring that other threads running | |
1397 | concurrently will hit the breakpoint as they should. | |
1398 | ||
1399 | The traditional way to step a thread T off a breakpoint in a | |
1400 | multi-threaded program in all-stop mode is as follows: | |
1401 | ||
1402 | a0) Initially, all threads are stopped, and breakpoints are not | |
1403 | inserted. | |
1404 | a1) We single-step T, leaving breakpoints uninserted. | |
1405 | a2) We insert breakpoints, and resume all threads. | |
1406 | ||
1407 | In non-stop debugging, however, this strategy is unsuitable: we | |
1408 | don't want to have to stop all threads in the system in order to | |
1409 | continue or step T past a breakpoint. Instead, we use displaced | |
1410 | stepping: | |
1411 | ||
1412 | n0) Initially, T is stopped, other threads are running, and | |
1413 | breakpoints are inserted. | |
1414 | n1) We copy the instruction "under" the breakpoint to a separate | |
1415 | location, outside the main code stream, making any adjustments | |
1416 | to the instruction, register, and memory state as directed by | |
1417 | T's architecture. | |
1418 | n2) We single-step T over the instruction at its new location. | |
1419 | n3) We adjust the resulting register and memory state as directed | |
1420 | by T's architecture. This includes resetting T's PC to point | |
1421 | back into the main instruction stream. | |
1422 | n4) We resume T. | |
1423 | ||
1424 | This approach depends on the following gdbarch methods: | |
1425 | ||
1426 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1427 | indicate where to copy the instruction, and how much space must | |
1428 | be reserved there. We use these in step n1. | |
1429 | ||
1430 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1431 | address, and makes any necessary adjustments to the instruction, | |
1432 | register contents, and memory. We use this in step n1. | |
1433 | ||
1434 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1435 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1436 | same effect the instruction would have had if we had executed it |
1437 | at its original address. We use this in step n3. | |
1438 | ||
237fc4c9 PA |
1439 | The gdbarch_displaced_step_copy_insn and |
1440 | gdbarch_displaced_step_fixup functions must be written so that | |
1441 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1442 | single-stepping across the copied instruction, and then applying | |
1443 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1444 | thread's memory and registers as stepping the instruction in place | |
1445 | would have. Exactly which responsibilities fall to the copy and | |
1446 | which fall to the fixup is up to the author of those functions. | |
1447 | ||
1448 | See the comments in gdbarch.sh for details. | |
1449 | ||
1450 | Note that displaced stepping and software single-step cannot | |
1451 | currently be used in combination, although with some care I think | |
1452 | they could be made to. Software single-step works by placing | |
1453 | breakpoints on all possible subsequent instructions; if the | |
1454 | displaced instruction is a PC-relative jump, those breakpoints | |
1455 | could fall in very strange places --- on pages that aren't | |
1456 | executable, or at addresses that are not proper instruction | |
1457 | boundaries. (We do generally let other threads run while we wait | |
1458 | to hit the software single-step breakpoint, and they might | |
1459 | encounter such a corrupted instruction.) One way to work around | |
1460 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1461 | simulate the effect of PC-relative instructions (and return NULL) | |
1462 | on architectures that use software single-stepping. | |
1463 | ||
1464 | In non-stop mode, we can have independent and simultaneous step | |
1465 | requests, so more than one thread may need to simultaneously step | |
1466 | over a breakpoint. The current implementation assumes there is | |
1467 | only one scratch space per process. In this case, we have to | |
1468 | serialize access to the scratch space. If thread A wants to step | |
1469 | over a breakpoint, but we are currently waiting for some other | |
1470 | thread to complete a displaced step, we leave thread A stopped and | |
1471 | place it in the displaced_step_request_queue. Whenever a displaced | |
1472 | step finishes, we pick the next thread in the queue and start a new | |
1473 | displaced step operation on it. See displaced_step_prepare and | |
1474 | displaced_step_fixup for details. */ | |
1475 | ||
cfba9872 SM |
1476 | /* Default destructor for displaced_step_closure. */ |
1477 | ||
1478 | displaced_step_closure::~displaced_step_closure () = default; | |
1479 | ||
2eb20436 | 1480 | /* Get the displaced stepping state of inferior INF. */ |
fc1cf338 | 1481 | |
39a36629 | 1482 | static displaced_step_inferior_state * |
00431a78 | 1483 | get_displaced_stepping_state (inferior *inf) |
fc1cf338 | 1484 | { |
d20172fc | 1485 | return &inf->displaced_step_state; |
fc1cf338 PA |
1486 | } |
1487 | ||
372316f1 PA |
1488 | /* Returns true if any inferior has a thread doing a displaced |
1489 | step. */ | |
1490 | ||
39a36629 SM |
1491 | static bool |
1492 | displaced_step_in_progress_any_inferior () | |
372316f1 | 1493 | { |
d20172fc | 1494 | for (inferior *i : all_inferiors ()) |
39a36629 | 1495 | { |
d20172fc | 1496 | if (i->displaced_step_state.step_thread != nullptr) |
39a36629 SM |
1497 | return true; |
1498 | } | |
372316f1 | 1499 | |
39a36629 | 1500 | return false; |
372316f1 PA |
1501 | } |
1502 | ||
a46d1843 | 1503 | /* Return true if THREAD is doing a displaced step. */ |
c0987663 | 1504 | |
c4464ade | 1505 | static bool |
00431a78 | 1506 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1507 | { |
00431a78 | 1508 | gdb_assert (thread != NULL); |
c0987663 | 1509 | |
d20172fc | 1510 | return get_displaced_stepping_state (thread->inf)->step_thread == thread; |
c0987663 YQ |
1511 | } |
1512 | ||
a46d1843 | 1513 | /* Return true if INF has a thread doing a displaced step. */ |
8f572e5c | 1514 | |
c4464ade | 1515 | static bool |
00431a78 | 1516 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1517 | { |
d20172fc | 1518 | return get_displaced_stepping_state (inf)->step_thread != nullptr; |
fc1cf338 PA |
1519 | } |
1520 | ||
a42244db YQ |
1521 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1522 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1523 | return NULL. */ | |
1524 | ||
1525 | struct displaced_step_closure* | |
1526 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1527 | { | |
d20172fc | 1528 | displaced_step_inferior_state *displaced |
00431a78 | 1529 | = get_displaced_stepping_state (current_inferior ()); |
a42244db YQ |
1530 | |
1531 | /* If checking the mode of displaced instruction in copy area. */ | |
d20172fc | 1532 | if (displaced->step_thread != nullptr |
00431a78 | 1533 | && displaced->step_copy == addr) |
d8d83535 | 1534 | return displaced->step_closure.get (); |
a42244db YQ |
1535 | |
1536 | return NULL; | |
1537 | } | |
1538 | ||
fc1cf338 PA |
1539 | static void |
1540 | infrun_inferior_exit (struct inferior *inf) | |
1541 | { | |
d20172fc | 1542 | inf->displaced_step_state.reset (); |
fc1cf338 | 1543 | } |
237fc4c9 | 1544 | |
fff08868 HZ |
1545 | /* If ON, and the architecture supports it, GDB will use displaced |
1546 | stepping to step over breakpoints. If OFF, or if the architecture | |
1547 | doesn't support it, GDB will instead use the traditional | |
1548 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1549 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1550 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1551 | |
72d0e2c5 | 1552 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1553 | |
237fc4c9 PA |
1554 | static void |
1555 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1556 | struct cmd_list_element *c, | |
1557 | const char *value) | |
1558 | { | |
72d0e2c5 | 1559 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1560 | fprintf_filtered (file, |
1561 | _("Debugger's willingness to use displaced stepping " | |
1562 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1563 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1564 | else |
3e43a32a MS |
1565 | fprintf_filtered (file, |
1566 | _("Debugger's willingness to use displaced stepping " | |
1567 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1568 | } |
1569 | ||
9822cb57 SM |
1570 | /* Return true if the gdbarch implements the required methods to use |
1571 | displaced stepping. */ | |
1572 | ||
1573 | static bool | |
1574 | gdbarch_supports_displaced_stepping (gdbarch *arch) | |
1575 | { | |
1576 | /* Only check for the presence of step_copy_insn. Other required methods | |
1577 | are checked by the gdbarch validation. */ | |
1578 | return gdbarch_displaced_step_copy_insn_p (arch); | |
1579 | } | |
1580 | ||
fff08868 | 1581 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1582 | over breakpoints of thread TP. */ |
fff08868 | 1583 | |
9822cb57 SM |
1584 | static bool |
1585 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1586 | { |
9822cb57 SM |
1587 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1588 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1589 | return false; | |
1590 | ||
1591 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1592 | way. */ | |
1593 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1594 | && !target_is_non_stop_p ()) | |
1595 | return false; | |
1596 | ||
1597 | gdbarch *gdbarch = get_thread_regcache (tp)->arch (); | |
1598 | ||
1599 | /* If the architecture doesn't implement displaced stepping, don't use | |
1600 | it. */ | |
1601 | if (!gdbarch_supports_displaced_stepping (gdbarch)) | |
1602 | return false; | |
1603 | ||
1604 | /* If recording, don't use displaced stepping. */ | |
1605 | if (find_record_target () != nullptr) | |
1606 | return false; | |
1607 | ||
d20172fc SM |
1608 | displaced_step_inferior_state *displaced_state |
1609 | = get_displaced_stepping_state (tp->inf); | |
3fc8eb30 | 1610 | |
9822cb57 SM |
1611 | /* If displaced stepping failed before for this inferior, don't bother trying |
1612 | again. */ | |
1613 | if (displaced_state->failed_before) | |
1614 | return false; | |
1615 | ||
1616 | return true; | |
237fc4c9 PA |
1617 | } |
1618 | ||
d8d83535 SM |
1619 | /* Simple function wrapper around displaced_step_inferior_state::reset. */ |
1620 | ||
237fc4c9 | 1621 | static void |
d8d83535 | 1622 | displaced_step_reset (displaced_step_inferior_state *displaced) |
237fc4c9 | 1623 | { |
d8d83535 | 1624 | displaced->reset (); |
237fc4c9 PA |
1625 | } |
1626 | ||
d8d83535 SM |
1627 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1628 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1629 | ||
1630 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 PA |
1631 | |
1632 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1633 | void | |
1634 | displaced_step_dump_bytes (struct ui_file *file, | |
1635 | const gdb_byte *buf, | |
1636 | size_t len) | |
1637 | { | |
1638 | int i; | |
1639 | ||
1640 | for (i = 0; i < len; i++) | |
1641 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1642 | fputs_unfiltered ("\n", file); | |
1643 | } | |
1644 | ||
1645 | /* Prepare to single-step, using displaced stepping. | |
1646 | ||
1647 | Note that we cannot use displaced stepping when we have a signal to | |
1648 | deliver. If we have a signal to deliver and an instruction to step | |
1649 | over, then after the step, there will be no indication from the | |
1650 | target whether the thread entered a signal handler or ignored the | |
1651 | signal and stepped over the instruction successfully --- both cases | |
1652 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1653 | fixup, and in the second case we must --- but we can't tell which. | |
1654 | Comments in the code for 'random signals' in handle_inferior_event | |
1655 | explain how we handle this case instead. | |
1656 | ||
1657 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1658 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1659 | if this instruction can't be displaced stepped. */ | |
1660 | ||
237fc4c9 | 1661 | static int |
00431a78 | 1662 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1663 | { |
00431a78 | 1664 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1665 | struct gdbarch *gdbarch = regcache->arch (); |
8b86c959 | 1666 | const address_space *aspace = regcache->aspace (); |
237fc4c9 PA |
1667 | CORE_ADDR original, copy; |
1668 | ULONGEST len; | |
9e529e1d | 1669 | int status; |
237fc4c9 PA |
1670 | |
1671 | /* We should never reach this function if the architecture does not | |
1672 | support displaced stepping. */ | |
9822cb57 | 1673 | gdb_assert (gdbarch_supports_displaced_stepping (gdbarch)); |
237fc4c9 | 1674 | |
c2829269 PA |
1675 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1676 | gdb_assert (tp->control.trap_expected); | |
1677 | ||
c1e36e3e PA |
1678 | /* Disable range stepping while executing in the scratch pad. We |
1679 | want a single-step even if executing the displaced instruction in | |
1680 | the scratch buffer lands within the stepping range (e.g., a | |
1681 | jump/branch). */ | |
1682 | tp->control.may_range_step = 0; | |
1683 | ||
fc1cf338 PA |
1684 | /* We have to displaced step one thread at a time, as we only have |
1685 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1686 | |
d20172fc SM |
1687 | displaced_step_inferior_state *displaced |
1688 | = get_displaced_stepping_state (tp->inf); | |
fc1cf338 | 1689 | |
00431a78 | 1690 | if (displaced->step_thread != nullptr) |
237fc4c9 PA |
1691 | { |
1692 | /* Already waiting for a displaced step to finish. Defer this | |
1693 | request and place in queue. */ | |
237fc4c9 PA |
1694 | |
1695 | if (debug_displaced) | |
1696 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1697 | "displaced: deferring step of %s\n", |
a068643d | 1698 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 | 1699 | |
c2829269 | 1700 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1701 | return 0; |
1702 | } | |
1703 | else | |
1704 | { | |
1705 | if (debug_displaced) | |
1706 | fprintf_unfiltered (gdb_stdlog, | |
1707 | "displaced: stepping %s now\n", | |
a068643d | 1708 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 PA |
1709 | } |
1710 | ||
d8d83535 | 1711 | displaced_step_reset (displaced); |
237fc4c9 | 1712 | |
00431a78 PA |
1713 | scoped_restore_current_thread restore_thread; |
1714 | ||
1715 | switch_to_thread (tp); | |
ad53cd71 | 1716 | |
515630c5 | 1717 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1718 | |
1719 | copy = gdbarch_displaced_step_location (gdbarch); | |
1720 | len = gdbarch_max_insn_length (gdbarch); | |
1721 | ||
d35ae833 PA |
1722 | if (breakpoint_in_range_p (aspace, copy, len)) |
1723 | { | |
1724 | /* There's a breakpoint set in the scratch pad location range | |
1725 | (which is usually around the entry point). We'd either | |
1726 | install it before resuming, which would overwrite/corrupt the | |
1727 | scratch pad, or if it was already inserted, this displaced | |
1728 | step would overwrite it. The latter is OK in the sense that | |
1729 | we already assume that no thread is going to execute the code | |
1730 | in the scratch pad range (after initial startup) anyway, but | |
1731 | the former is unacceptable. Simply punt and fallback to | |
1732 | stepping over this breakpoint in-line. */ | |
1733 | if (debug_displaced) | |
1734 | { | |
1735 | fprintf_unfiltered (gdb_stdlog, | |
1736 | "displaced: breakpoint set in scratch pad. " | |
1737 | "Stepping over breakpoint in-line instead.\n"); | |
1738 | } | |
1739 | ||
d35ae833 PA |
1740 | return -1; |
1741 | } | |
1742 | ||
237fc4c9 | 1743 | /* Save the original contents of the copy area. */ |
d20172fc SM |
1744 | displaced->step_saved_copy.resize (len); |
1745 | status = target_read_memory (copy, displaced->step_saved_copy.data (), len); | |
9e529e1d JK |
1746 | if (status != 0) |
1747 | throw_error (MEMORY_ERROR, | |
1748 | _("Error accessing memory address %s (%s) for " | |
1749 | "displaced-stepping scratch space."), | |
1750 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1751 | if (debug_displaced) |
1752 | { | |
5af949e3 UW |
1753 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1754 | paddress (gdbarch, copy)); | |
fc1cf338 | 1755 | displaced_step_dump_bytes (gdb_stdlog, |
d20172fc | 1756 | displaced->step_saved_copy.data (), |
fc1cf338 | 1757 | len); |
237fc4c9 PA |
1758 | }; |
1759 | ||
e8217e61 SM |
1760 | displaced->step_closure |
1761 | = gdbarch_displaced_step_copy_insn (gdbarch, original, copy, regcache); | |
1762 | if (displaced->step_closure == NULL) | |
7f03bd92 PA |
1763 | { |
1764 | /* The architecture doesn't know how or want to displaced step | |
1765 | this instruction or instruction sequence. Fallback to | |
1766 | stepping over the breakpoint in-line. */ | |
7f03bd92 PA |
1767 | return -1; |
1768 | } | |
237fc4c9 | 1769 | |
9f5a595d UW |
1770 | /* Save the information we need to fix things up if the step |
1771 | succeeds. */ | |
00431a78 | 1772 | displaced->step_thread = tp; |
fc1cf338 | 1773 | displaced->step_gdbarch = gdbarch; |
fc1cf338 PA |
1774 | displaced->step_original = original; |
1775 | displaced->step_copy = copy; | |
9f5a595d | 1776 | |
9799571e | 1777 | { |
d8d83535 | 1778 | displaced_step_reset_cleanup cleanup (displaced); |
237fc4c9 | 1779 | |
9799571e TT |
1780 | /* Resume execution at the copy. */ |
1781 | regcache_write_pc (regcache, copy); | |
237fc4c9 | 1782 | |
9799571e TT |
1783 | cleanup.release (); |
1784 | } | |
ad53cd71 | 1785 | |
237fc4c9 | 1786 | if (debug_displaced) |
5af949e3 UW |
1787 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1788 | paddress (gdbarch, copy)); | |
237fc4c9 | 1789 | |
237fc4c9 PA |
1790 | return 1; |
1791 | } | |
1792 | ||
3fc8eb30 PA |
1793 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1794 | attempts at displaced stepping if we get a memory error. */ | |
1795 | ||
1796 | static int | |
00431a78 | 1797 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 PA |
1798 | { |
1799 | int prepared = -1; | |
1800 | ||
a70b8144 | 1801 | try |
3fc8eb30 | 1802 | { |
00431a78 | 1803 | prepared = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1804 | } |
230d2906 | 1805 | catch (const gdb_exception_error &ex) |
3fc8eb30 PA |
1806 | { |
1807 | struct displaced_step_inferior_state *displaced_state; | |
1808 | ||
16b41842 PA |
1809 | if (ex.error != MEMORY_ERROR |
1810 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1811 | throw; |
3fc8eb30 | 1812 | |
1eb8556f SM |
1813 | infrun_debug_printf ("caught exception, disabling displaced stepping: %s", |
1814 | ex.what ()); | |
3fc8eb30 PA |
1815 | |
1816 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1817 | "auto". */ | |
1818 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1819 | { | |
fd7dcb94 | 1820 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1821 | ex.what ()); |
3fc8eb30 PA |
1822 | } |
1823 | ||
1824 | /* Disable further displaced stepping attempts. */ | |
1825 | displaced_state | |
00431a78 | 1826 | = get_displaced_stepping_state (thread->inf); |
3fc8eb30 PA |
1827 | displaced_state->failed_before = 1; |
1828 | } | |
3fc8eb30 PA |
1829 | |
1830 | return prepared; | |
1831 | } | |
1832 | ||
237fc4c9 | 1833 | static void |
3e43a32a MS |
1834 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1835 | const gdb_byte *myaddr, int len) | |
237fc4c9 | 1836 | { |
2989a365 | 1837 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
abbb1732 | 1838 | |
237fc4c9 PA |
1839 | inferior_ptid = ptid; |
1840 | write_memory (memaddr, myaddr, len); | |
237fc4c9 PA |
1841 | } |
1842 | ||
e2d96639 YQ |
1843 | /* Restore the contents of the copy area for thread PTID. */ |
1844 | ||
1845 | static void | |
1846 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1847 | ptid_t ptid) | |
1848 | { | |
1849 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1850 | ||
1851 | write_memory_ptid (ptid, displaced->step_copy, | |
d20172fc | 1852 | displaced->step_saved_copy.data (), len); |
e2d96639 YQ |
1853 | if (debug_displaced) |
1854 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
a068643d | 1855 | target_pid_to_str (ptid).c_str (), |
e2d96639 YQ |
1856 | paddress (displaced->step_gdbarch, |
1857 | displaced->step_copy)); | |
1858 | } | |
1859 | ||
372316f1 PA |
1860 | /* If we displaced stepped an instruction successfully, adjust |
1861 | registers and memory to yield the same effect the instruction would | |
1862 | have had if we had executed it at its original address, and return | |
1863 | 1. If the instruction didn't complete, relocate the PC and return | |
1864 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1865 | ||
1866 | static int | |
00431a78 | 1867 | displaced_step_fixup (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1868 | { |
fc1cf338 | 1869 | struct displaced_step_inferior_state *displaced |
00431a78 | 1870 | = get_displaced_stepping_state (event_thread->inf); |
372316f1 | 1871 | int ret; |
fc1cf338 | 1872 | |
00431a78 PA |
1873 | /* Was this event for the thread we displaced? */ |
1874 | if (displaced->step_thread != event_thread) | |
372316f1 | 1875 | return 0; |
237fc4c9 | 1876 | |
cb71640d PA |
1877 | /* Fixup may need to read memory/registers. Switch to the thread |
1878 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
d43b7a2d TBA |
1879 | the current thread, and displaced_step_restore performs ptid-dependent |
1880 | memory accesses using current_inferior() and current_top_target(). */ | |
00431a78 | 1881 | switch_to_thread (event_thread); |
cb71640d | 1882 | |
d43b7a2d TBA |
1883 | displaced_step_reset_cleanup cleanup (displaced); |
1884 | ||
1885 | displaced_step_restore (displaced, displaced->step_thread->ptid); | |
1886 | ||
237fc4c9 | 1887 | /* Did the instruction complete successfully? */ |
cb71640d PA |
1888 | if (signal == GDB_SIGNAL_TRAP |
1889 | && !(target_stopped_by_watchpoint () | |
1890 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
9aed480c | 1891 | || target_have_steppable_watchpoint ()))) |
237fc4c9 PA |
1892 | { |
1893 | /* Fix up the resulting state. */ | |
fc1cf338 | 1894 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
d8d83535 | 1895 | displaced->step_closure.get (), |
fc1cf338 PA |
1896 | displaced->step_original, |
1897 | displaced->step_copy, | |
00431a78 | 1898 | get_thread_regcache (displaced->step_thread)); |
372316f1 | 1899 | ret = 1; |
237fc4c9 PA |
1900 | } |
1901 | else | |
1902 | { | |
1903 | /* Since the instruction didn't complete, all we can do is | |
1904 | relocate the PC. */ | |
00431a78 | 1905 | struct regcache *regcache = get_thread_regcache (event_thread); |
515630c5 | 1906 | CORE_ADDR pc = regcache_read_pc (regcache); |
abbb1732 | 1907 | |
fc1cf338 | 1908 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1909 | regcache_write_pc (regcache, pc); |
372316f1 | 1910 | ret = -1; |
237fc4c9 PA |
1911 | } |
1912 | ||
372316f1 | 1913 | return ret; |
c2829269 | 1914 | } |
1c5cfe86 | 1915 | |
4d9d9d04 PA |
1916 | /* Data to be passed around while handling an event. This data is |
1917 | discarded between events. */ | |
1918 | struct execution_control_state | |
1919 | { | |
5b6d1e4f | 1920 | process_stratum_target *target; |
4d9d9d04 PA |
1921 | ptid_t ptid; |
1922 | /* The thread that got the event, if this was a thread event; NULL | |
1923 | otherwise. */ | |
1924 | struct thread_info *event_thread; | |
1925 | ||
1926 | struct target_waitstatus ws; | |
1927 | int stop_func_filled_in; | |
1928 | CORE_ADDR stop_func_start; | |
1929 | CORE_ADDR stop_func_end; | |
1930 | const char *stop_func_name; | |
1931 | int wait_some_more; | |
1932 | ||
1933 | /* True if the event thread hit the single-step breakpoint of | |
1934 | another thread. Thus the event doesn't cause a stop, the thread | |
1935 | needs to be single-stepped past the single-step breakpoint before | |
1936 | we can switch back to the original stepping thread. */ | |
1937 | int hit_singlestep_breakpoint; | |
1938 | }; | |
1939 | ||
1940 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1941 | |
1942 | static void | |
4d9d9d04 PA |
1943 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1944 | { | |
1945 | memset (ecs, 0, sizeof (*ecs)); | |
1946 | ecs->event_thread = tp; | |
1947 | ecs->ptid = tp->ptid; | |
1948 | } | |
1949 | ||
1950 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1951 | static void prepare_to_wait (struct execution_control_state *ecs); | |
c4464ade | 1952 | static bool keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1953 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1954 | |
1955 | /* Are there any pending step-over requests? If so, run all we can | |
1956 | now and return true. Otherwise, return false. */ | |
1957 | ||
c4464ade | 1958 | static bool |
c2829269 PA |
1959 | start_step_over (void) |
1960 | { | |
1961 | struct thread_info *tp, *next; | |
1962 | ||
372316f1 PA |
1963 | /* Don't start a new step-over if we already have an in-line |
1964 | step-over operation ongoing. */ | |
1965 | if (step_over_info_valid_p ()) | |
c4464ade | 1966 | return false; |
372316f1 | 1967 | |
c2829269 | 1968 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 1969 | { |
4d9d9d04 PA |
1970 | struct execution_control_state ecss; |
1971 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1972 | step_over_what step_what; |
372316f1 | 1973 | int must_be_in_line; |
c2829269 | 1974 | |
c65d6b55 PA |
1975 | gdb_assert (!tp->stop_requested); |
1976 | ||
c2829269 | 1977 | next = thread_step_over_chain_next (tp); |
237fc4c9 | 1978 | |
c2829269 PA |
1979 | /* If this inferior already has a displaced step in process, |
1980 | don't start a new one. */ | |
00431a78 | 1981 | if (displaced_step_in_progress (tp->inf)) |
c2829269 PA |
1982 | continue; |
1983 | ||
372316f1 PA |
1984 | step_what = thread_still_needs_step_over (tp); |
1985 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1986 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1987 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1988 | |
1989 | /* We currently stop all threads of all processes to step-over | |
1990 | in-line. If we need to start a new in-line step-over, let | |
1991 | any pending displaced steps finish first. */ | |
1992 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
c4464ade | 1993 | return false; |
372316f1 | 1994 | |
c2829269 PA |
1995 | thread_step_over_chain_remove (tp); |
1996 | ||
1997 | if (step_over_queue_head == NULL) | |
1eb8556f | 1998 | infrun_debug_printf ("step-over queue now empty"); |
c2829269 | 1999 | |
372316f1 PA |
2000 | if (tp->control.trap_expected |
2001 | || tp->resumed | |
2002 | || tp->executing) | |
ad53cd71 | 2003 | { |
4d9d9d04 PA |
2004 | internal_error (__FILE__, __LINE__, |
2005 | "[%s] has inconsistent state: " | |
372316f1 | 2006 | "trap_expected=%d, resumed=%d, executing=%d\n", |
a068643d | 2007 | target_pid_to_str (tp->ptid).c_str (), |
4d9d9d04 | 2008 | tp->control.trap_expected, |
372316f1 | 2009 | tp->resumed, |
4d9d9d04 | 2010 | tp->executing); |
ad53cd71 | 2011 | } |
1c5cfe86 | 2012 | |
1eb8556f SM |
2013 | infrun_debug_printf ("resuming [%s] for step-over", |
2014 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 PA |
2015 | |
2016 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2017 | is no longer inserted. In all-stop, we want to keep looking | |
2018 | for a thread that needs a step-over instead of resuming TP, | |
2019 | because we wouldn't be able to resume anything else until the | |
2020 | target stops again. In non-stop, the resume always resumes | |
2021 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2022 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2023 | continue; |
8550d3b3 | 2024 | |
00431a78 | 2025 | switch_to_thread (tp); |
4d9d9d04 PA |
2026 | reset_ecs (ecs, tp); |
2027 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2028 | |
4d9d9d04 PA |
2029 | if (!ecs->wait_some_more) |
2030 | error (_("Command aborted.")); | |
1c5cfe86 | 2031 | |
372316f1 PA |
2032 | gdb_assert (tp->resumed); |
2033 | ||
2034 | /* If we started a new in-line step-over, we're done. */ | |
2035 | if (step_over_info_valid_p ()) | |
2036 | { | |
2037 | gdb_assert (tp->control.trap_expected); | |
c4464ade | 2038 | return true; |
372316f1 PA |
2039 | } |
2040 | ||
fbea99ea | 2041 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2042 | { |
2043 | /* On all-stop, shouldn't have resumed unless we needed a | |
2044 | step over. */ | |
2045 | gdb_assert (tp->control.trap_expected | |
2046 | || tp->step_after_step_resume_breakpoint); | |
2047 | ||
2048 | /* With remote targets (at least), in all-stop, we can't | |
2049 | issue any further remote commands until the program stops | |
2050 | again. */ | |
c4464ade | 2051 | return true; |
1c5cfe86 | 2052 | } |
c2829269 | 2053 | |
4d9d9d04 PA |
2054 | /* Either the thread no longer needed a step-over, or a new |
2055 | displaced stepping sequence started. Even in the latter | |
2056 | case, continue looking. Maybe we can also start another | |
2057 | displaced step on a thread of other process. */ | |
237fc4c9 | 2058 | } |
4d9d9d04 | 2059 | |
c4464ade | 2060 | return false; |
237fc4c9 PA |
2061 | } |
2062 | ||
5231c1fd PA |
2063 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2064 | holding OLD_PTID. */ | |
2065 | static void | |
b161a60d SM |
2066 | infrun_thread_ptid_changed (process_stratum_target *target, |
2067 | ptid_t old_ptid, ptid_t new_ptid) | |
5231c1fd | 2068 | { |
b161a60d SM |
2069 | if (inferior_ptid == old_ptid |
2070 | && current_inferior ()->process_target () == target) | |
5231c1fd | 2071 | inferior_ptid = new_ptid; |
5231c1fd PA |
2072 | } |
2073 | ||
237fc4c9 | 2074 | \f |
c906108c | 2075 | |
53904c9e AC |
2076 | static const char schedlock_off[] = "off"; |
2077 | static const char schedlock_on[] = "on"; | |
2078 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2079 | static const char schedlock_replay[] = "replay"; |
40478521 | 2080 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2081 | schedlock_off, |
2082 | schedlock_on, | |
2083 | schedlock_step, | |
f2665db5 | 2084 | schedlock_replay, |
ef346e04 AC |
2085 | NULL |
2086 | }; | |
f2665db5 | 2087 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2088 | static void |
2089 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2090 | struct cmd_list_element *c, const char *value) | |
2091 | { | |
3e43a32a MS |
2092 | fprintf_filtered (file, |
2093 | _("Mode for locking scheduler " | |
2094 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2095 | value); |
2096 | } | |
c906108c SS |
2097 | |
2098 | static void | |
eb4c3f4a | 2099 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2100 | { |
8a3ecb79 | 2101 | if (!target_can_lock_scheduler ()) |
eefe576e AC |
2102 | { |
2103 | scheduler_mode = schedlock_off; | |
2104 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2105 | } | |
c906108c SS |
2106 | } |
2107 | ||
d4db2f36 PA |
2108 | /* True if execution commands resume all threads of all processes by |
2109 | default; otherwise, resume only threads of the current inferior | |
2110 | process. */ | |
491144b5 | 2111 | bool sched_multi = false; |
d4db2f36 | 2112 | |
2facfe5c | 2113 | /* Try to setup for software single stepping over the specified location. |
c4464ade | 2114 | Return true if target_resume() should use hardware single step. |
2facfe5c DD |
2115 | |
2116 | GDBARCH the current gdbarch. | |
2117 | PC the location to step over. */ | |
2118 | ||
c4464ade | 2119 | static bool |
2facfe5c DD |
2120 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) |
2121 | { | |
c4464ade | 2122 | bool hw_step = true; |
2facfe5c | 2123 | |
f02253f1 | 2124 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2125 | && gdbarch_software_single_step_p (gdbarch)) |
2126 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2127 | ||
2facfe5c DD |
2128 | return hw_step; |
2129 | } | |
c906108c | 2130 | |
f3263aa4 PA |
2131 | /* See infrun.h. */ |
2132 | ||
09cee04b PA |
2133 | ptid_t |
2134 | user_visible_resume_ptid (int step) | |
2135 | { | |
f3263aa4 | 2136 | ptid_t resume_ptid; |
09cee04b | 2137 | |
09cee04b PA |
2138 | if (non_stop) |
2139 | { | |
2140 | /* With non-stop mode on, threads are always handled | |
2141 | individually. */ | |
2142 | resume_ptid = inferior_ptid; | |
2143 | } | |
2144 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2145 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2146 | { |
f3263aa4 PA |
2147 | /* User-settable 'scheduler' mode requires solo thread |
2148 | resume. */ | |
09cee04b PA |
2149 | resume_ptid = inferior_ptid; |
2150 | } | |
f2665db5 MM |
2151 | else if ((scheduler_mode == schedlock_replay) |
2152 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2153 | { | |
2154 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2155 | mode. */ | |
2156 | resume_ptid = inferior_ptid; | |
2157 | } | |
f3263aa4 PA |
2158 | else if (!sched_multi && target_supports_multi_process ()) |
2159 | { | |
2160 | /* Resume all threads of the current process (and none of other | |
2161 | processes). */ | |
e99b03dc | 2162 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2163 | } |
2164 | else | |
2165 | { | |
2166 | /* Resume all threads of all processes. */ | |
2167 | resume_ptid = RESUME_ALL; | |
2168 | } | |
09cee04b PA |
2169 | |
2170 | return resume_ptid; | |
2171 | } | |
2172 | ||
5b6d1e4f PA |
2173 | /* See infrun.h. */ |
2174 | ||
2175 | process_stratum_target * | |
2176 | user_visible_resume_target (ptid_t resume_ptid) | |
2177 | { | |
2178 | return (resume_ptid == minus_one_ptid && sched_multi | |
2179 | ? NULL | |
2180 | : current_inferior ()->process_target ()); | |
2181 | } | |
2182 | ||
fbea99ea PA |
2183 | /* Return a ptid representing the set of threads that we will resume, |
2184 | in the perspective of the target, assuming run control handling | |
2185 | does not require leaving some threads stopped (e.g., stepping past | |
2186 | breakpoint). USER_STEP indicates whether we're about to start the | |
2187 | target for a stepping command. */ | |
2188 | ||
2189 | static ptid_t | |
2190 | internal_resume_ptid (int user_step) | |
2191 | { | |
2192 | /* In non-stop, we always control threads individually. Note that | |
2193 | the target may always work in non-stop mode even with "set | |
2194 | non-stop off", in which case user_visible_resume_ptid could | |
2195 | return a wildcard ptid. */ | |
2196 | if (target_is_non_stop_p ()) | |
2197 | return inferior_ptid; | |
2198 | else | |
2199 | return user_visible_resume_ptid (user_step); | |
2200 | } | |
2201 | ||
64ce06e4 PA |
2202 | /* Wrapper for target_resume, that handles infrun-specific |
2203 | bookkeeping. */ | |
2204 | ||
2205 | static void | |
c4464ade | 2206 | do_target_resume (ptid_t resume_ptid, bool step, enum gdb_signal sig) |
64ce06e4 PA |
2207 | { |
2208 | struct thread_info *tp = inferior_thread (); | |
2209 | ||
c65d6b55 PA |
2210 | gdb_assert (!tp->stop_requested); |
2211 | ||
64ce06e4 | 2212 | /* Install inferior's terminal modes. */ |
223ffa71 | 2213 | target_terminal::inferior (); |
64ce06e4 PA |
2214 | |
2215 | /* Avoid confusing the next resume, if the next stop/resume | |
2216 | happens to apply to another thread. */ | |
2217 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2218 | ||
8f572e5c PA |
2219 | /* Advise target which signals may be handled silently. |
2220 | ||
2221 | If we have removed breakpoints because we are stepping over one | |
2222 | in-line (in any thread), we need to receive all signals to avoid | |
2223 | accidentally skipping a breakpoint during execution of a signal | |
2224 | handler. | |
2225 | ||
2226 | Likewise if we're displaced stepping, otherwise a trap for a | |
2227 | breakpoint in a signal handler might be confused with the | |
2228 | displaced step finishing. We don't make the displaced_step_fixup | |
2229 | step distinguish the cases instead, because: | |
2230 | ||
2231 | - a backtrace while stopped in the signal handler would show the | |
2232 | scratch pad as frame older than the signal handler, instead of | |
2233 | the real mainline code. | |
2234 | ||
2235 | - when the thread is later resumed, the signal handler would | |
2236 | return to the scratch pad area, which would no longer be | |
2237 | valid. */ | |
2238 | if (step_over_info_valid_p () | |
00431a78 | 2239 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2240 | target_pass_signals ({}); |
64ce06e4 | 2241 | else |
adc6a863 | 2242 | target_pass_signals (signal_pass); |
64ce06e4 PA |
2243 | |
2244 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2245 | |
2246 | target_commit_resume (); | |
5b6d1e4f PA |
2247 | |
2248 | if (target_can_async_p ()) | |
2249 | target_async (1); | |
64ce06e4 PA |
2250 | } |
2251 | ||
d930703d | 2252 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2253 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2254 | call 'resume', which handles exceptions. */ | |
c906108c | 2255 | |
71d378ae PA |
2256 | static void |
2257 | resume_1 (enum gdb_signal sig) | |
c906108c | 2258 | { |
515630c5 | 2259 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2260 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2261 | struct thread_info *tp = inferior_thread (); |
8b86c959 | 2262 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2263 | ptid_t resume_ptid; |
856e7dd6 PA |
2264 | /* This represents the user's step vs continue request. When |
2265 | deciding whether "set scheduler-locking step" applies, it's the | |
2266 | user's intention that counts. */ | |
2267 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2268 | /* This represents what we'll actually request the target to do. |
2269 | This can decay from a step to a continue, if e.g., we need to | |
2270 | implement single-stepping with breakpoints (software | |
2271 | single-step). */ | |
c4464ade | 2272 | bool step; |
c7e8a53c | 2273 | |
c65d6b55 | 2274 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2275 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2276 | ||
372316f1 PA |
2277 | if (tp->suspend.waitstatus_pending_p) |
2278 | { | |
1eb8556f SM |
2279 | infrun_debug_printf |
2280 | ("thread %s has pending wait " | |
2281 | "status %s (currently_stepping=%d).", | |
2282 | target_pid_to_str (tp->ptid).c_str (), | |
2283 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2284 | currently_stepping (tp)); | |
372316f1 | 2285 | |
5b6d1e4f | 2286 | tp->inf->process_target ()->threads_executing = true; |
719546c4 | 2287 | tp->resumed = true; |
372316f1 PA |
2288 | |
2289 | /* FIXME: What should we do if we are supposed to resume this | |
2290 | thread with a signal? Maybe we should maintain a queue of | |
2291 | pending signals to deliver. */ | |
2292 | if (sig != GDB_SIGNAL_0) | |
2293 | { | |
fd7dcb94 | 2294 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d TT |
2295 | gdb_signal_to_name (sig), |
2296 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2297 | } |
2298 | ||
2299 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2300 | |
2301 | if (target_can_async_p ()) | |
9516f85a AB |
2302 | { |
2303 | target_async (1); | |
2304 | /* Tell the event loop we have an event to process. */ | |
2305 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2306 | } | |
372316f1 PA |
2307 | return; |
2308 | } | |
2309 | ||
2310 | tp->stepped_breakpoint = 0; | |
2311 | ||
6b403daa PA |
2312 | /* Depends on stepped_breakpoint. */ |
2313 | step = currently_stepping (tp); | |
2314 | ||
74609e71 YQ |
2315 | if (current_inferior ()->waiting_for_vfork_done) |
2316 | { | |
48f9886d PA |
2317 | /* Don't try to single-step a vfork parent that is waiting for |
2318 | the child to get out of the shared memory region (by exec'ing | |
2319 | or exiting). This is particularly important on software | |
2320 | single-step archs, as the child process would trip on the | |
2321 | software single step breakpoint inserted for the parent | |
2322 | process. Since the parent will not actually execute any | |
2323 | instruction until the child is out of the shared region (such | |
2324 | are vfork's semantics), it is safe to simply continue it. | |
2325 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2326 | the parent, and tell it to `keep_going', which automatically | |
2327 | re-sets it stepping. */ | |
1eb8556f | 2328 | infrun_debug_printf ("resume : clear step"); |
c4464ade | 2329 | step = false; |
74609e71 YQ |
2330 | } |
2331 | ||
7ca9b62a TBA |
2332 | CORE_ADDR pc = regcache_read_pc (regcache); |
2333 | ||
1eb8556f SM |
2334 | infrun_debug_printf ("step=%d, signal=%s, trap_expected=%d, " |
2335 | "current thread [%s] at %s", | |
2336 | step, gdb_signal_to_symbol_string (sig), | |
2337 | tp->control.trap_expected, | |
2338 | target_pid_to_str (inferior_ptid).c_str (), | |
2339 | paddress (gdbarch, pc)); | |
c906108c | 2340 | |
c2c6d25f JM |
2341 | /* Normally, by the time we reach `resume', the breakpoints are either |
2342 | removed or inserted, as appropriate. The exception is if we're sitting | |
2343 | at a permanent breakpoint; we need to step over it, but permanent | |
2344 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2345 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2346 | { |
af48d08f PA |
2347 | if (sig != GDB_SIGNAL_0) |
2348 | { | |
2349 | /* We have a signal to pass to the inferior. The resume | |
2350 | may, or may not take us to the signal handler. If this | |
2351 | is a step, we'll need to stop in the signal handler, if | |
2352 | there's one, (if the target supports stepping into | |
2353 | handlers), or in the next mainline instruction, if | |
2354 | there's no handler. If this is a continue, we need to be | |
2355 | sure to run the handler with all breakpoints inserted. | |
2356 | In all cases, set a breakpoint at the current address | |
2357 | (where the handler returns to), and once that breakpoint | |
2358 | is hit, resume skipping the permanent breakpoint. If | |
2359 | that breakpoint isn't hit, then we've stepped into the | |
2360 | signal handler (or hit some other event). We'll delete | |
2361 | the step-resume breakpoint then. */ | |
2362 | ||
1eb8556f SM |
2363 | infrun_debug_printf ("resume: skipping permanent breakpoint, " |
2364 | "deliver signal first"); | |
af48d08f PA |
2365 | |
2366 | clear_step_over_info (); | |
2367 | tp->control.trap_expected = 0; | |
2368 | ||
2369 | if (tp->control.step_resume_breakpoint == NULL) | |
2370 | { | |
2371 | /* Set a "high-priority" step-resume, as we don't want | |
2372 | user breakpoints at PC to trigger (again) when this | |
2373 | hits. */ | |
2374 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2375 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2376 | ||
2377 | tp->step_after_step_resume_breakpoint = step; | |
2378 | } | |
2379 | ||
2380 | insert_breakpoints (); | |
2381 | } | |
2382 | else | |
2383 | { | |
2384 | /* There's no signal to pass, we can go ahead and skip the | |
2385 | permanent breakpoint manually. */ | |
1eb8556f | 2386 | infrun_debug_printf ("skipping permanent breakpoint"); |
af48d08f PA |
2387 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); |
2388 | /* Update pc to reflect the new address from which we will | |
2389 | execute instructions. */ | |
2390 | pc = regcache_read_pc (regcache); | |
2391 | ||
2392 | if (step) | |
2393 | { | |
2394 | /* We've already advanced the PC, so the stepping part | |
2395 | is done. Now we need to arrange for a trap to be | |
2396 | reported to handle_inferior_event. Set a breakpoint | |
2397 | at the current PC, and run to it. Don't update | |
2398 | prev_pc, because if we end in | |
44a1ee51 PA |
2399 | switch_back_to_stepped_thread, we want the "expected |
2400 | thread advanced also" branch to be taken. IOW, we | |
2401 | don't want this thread to step further from PC | |
af48d08f | 2402 | (overstep). */ |
1ac806b8 | 2403 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2404 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2405 | insert_breakpoints (); | |
2406 | ||
fbea99ea | 2407 | resume_ptid = internal_resume_ptid (user_step); |
c4464ade | 2408 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
719546c4 | 2409 | tp->resumed = true; |
af48d08f PA |
2410 | return; |
2411 | } | |
2412 | } | |
6d350bb5 | 2413 | } |
c2c6d25f | 2414 | |
c1e36e3e PA |
2415 | /* If we have a breakpoint to step over, make sure to do a single |
2416 | step only. Same if we have software watchpoints. */ | |
2417 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2418 | tp->control.may_range_step = 0; | |
2419 | ||
7da6a5b9 LM |
2420 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2421 | copy of the instruction at a different address. | |
237fc4c9 PA |
2422 | |
2423 | We can't use displaced stepping when we have a signal to deliver; | |
2424 | the comments for displaced_step_prepare explain why. The | |
2425 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2426 | signals' explain what we do instead. |
2427 | ||
2428 | We can't use displaced stepping when we are waiting for vfork_done | |
2429 | event, displaced stepping breaks the vfork child similarly as single | |
2430 | step software breakpoint. */ | |
3fc8eb30 PA |
2431 | if (tp->control.trap_expected |
2432 | && use_displaced_stepping (tp) | |
cb71640d | 2433 | && !step_over_info_valid_p () |
a493e3e2 | 2434 | && sig == GDB_SIGNAL_0 |
74609e71 | 2435 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2436 | { |
00431a78 | 2437 | int prepared = displaced_step_prepare (tp); |
fc1cf338 | 2438 | |
3fc8eb30 | 2439 | if (prepared == 0) |
d56b7306 | 2440 | { |
1eb8556f | 2441 | infrun_debug_printf ("Got placed in step-over queue"); |
4d9d9d04 PA |
2442 | |
2443 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2444 | return; |
2445 | } | |
3fc8eb30 PA |
2446 | else if (prepared < 0) |
2447 | { | |
2448 | /* Fallback to stepping over the breakpoint in-line. */ | |
2449 | ||
2450 | if (target_is_non_stop_p ()) | |
2451 | stop_all_threads (); | |
2452 | ||
a01bda52 | 2453 | set_step_over_info (regcache->aspace (), |
21edc42f | 2454 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2455 | |
2456 | step = maybe_software_singlestep (gdbarch, pc); | |
2457 | ||
2458 | insert_breakpoints (); | |
2459 | } | |
2460 | else if (prepared > 0) | |
2461 | { | |
3fc8eb30 PA |
2462 | /* Update pc to reflect the new address from which we will |
2463 | execute instructions due to displaced stepping. */ | |
00431a78 | 2464 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2465 | |
40a53766 | 2466 | step = gdbarch_displaced_step_hw_singlestep (gdbarch); |
3fc8eb30 | 2467 | } |
237fc4c9 PA |
2468 | } |
2469 | ||
2facfe5c | 2470 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2471 | else if (step) |
2facfe5c | 2472 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2473 | |
30852783 UW |
2474 | /* Currently, our software single-step implementation leads to different |
2475 | results than hardware single-stepping in one situation: when stepping | |
2476 | into delivering a signal which has an associated signal handler, | |
2477 | hardware single-step will stop at the first instruction of the handler, | |
2478 | while software single-step will simply skip execution of the handler. | |
2479 | ||
2480 | For now, this difference in behavior is accepted since there is no | |
2481 | easy way to actually implement single-stepping into a signal handler | |
2482 | without kernel support. | |
2483 | ||
2484 | However, there is one scenario where this difference leads to follow-on | |
2485 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2486 | and then single-stepping. In this case, the software single-step | |
2487 | behavior means that even if there is a *breakpoint* in the signal | |
2488 | handler, GDB still would not stop. | |
2489 | ||
2490 | Fortunately, we can at least fix this particular issue. We detect | |
2491 | here the case where we are about to deliver a signal while software | |
2492 | single-stepping with breakpoints removed. In this situation, we | |
2493 | revert the decisions to remove all breakpoints and insert single- | |
2494 | step breakpoints, and instead we install a step-resume breakpoint | |
2495 | at the current address, deliver the signal without stepping, and | |
2496 | once we arrive back at the step-resume breakpoint, actually step | |
2497 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2498 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2499 | && sig != GDB_SIGNAL_0 |
2500 | && step_over_info_valid_p ()) | |
30852783 UW |
2501 | { |
2502 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2503 | immediately after a handler returns, might already have |
30852783 UW |
2504 | a step-resume breakpoint set on the earlier handler. We cannot |
2505 | set another step-resume breakpoint; just continue on until the | |
2506 | original breakpoint is hit. */ | |
2507 | if (tp->control.step_resume_breakpoint == NULL) | |
2508 | { | |
2c03e5be | 2509 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2510 | tp->step_after_step_resume_breakpoint = 1; |
2511 | } | |
2512 | ||
34b7e8a6 | 2513 | delete_single_step_breakpoints (tp); |
30852783 | 2514 | |
31e77af2 | 2515 | clear_step_over_info (); |
30852783 | 2516 | tp->control.trap_expected = 0; |
31e77af2 PA |
2517 | |
2518 | insert_breakpoints (); | |
30852783 UW |
2519 | } |
2520 | ||
b0f16a3e SM |
2521 | /* If STEP is set, it's a request to use hardware stepping |
2522 | facilities. But in that case, we should never | |
2523 | use singlestep breakpoint. */ | |
34b7e8a6 | 2524 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2525 | |
fbea99ea | 2526 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2527 | if (tp->control.trap_expected) |
b0f16a3e SM |
2528 | { |
2529 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2530 | hit, either by single-stepping the thread with the breakpoint |
2531 | removed, or by displaced stepping, with the breakpoint inserted. | |
2532 | In the former case, we need to single-step only this thread, | |
2533 | and keep others stopped, as they can miss this breakpoint if | |
2534 | allowed to run. That's not really a problem for displaced | |
2535 | stepping, but, we still keep other threads stopped, in case | |
2536 | another thread is also stopped for a breakpoint waiting for | |
2537 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2538 | resume_ptid = inferior_ptid; |
2539 | } | |
fbea99ea PA |
2540 | else |
2541 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2542 | |
7f5ef605 PA |
2543 | if (execution_direction != EXEC_REVERSE |
2544 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2545 | { |
372316f1 PA |
2546 | /* There are two cases where we currently need to step a |
2547 | breakpoint instruction when we have a signal to deliver: | |
2548 | ||
2549 | - See handle_signal_stop where we handle random signals that | |
2550 | could take out us out of the stepping range. Normally, in | |
2551 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2552 | signal handler with a breakpoint at PC, but there are cases |
2553 | where we should _always_ single-step, even if we have a | |
2554 | step-resume breakpoint, like when a software watchpoint is | |
2555 | set. Assuming single-stepping and delivering a signal at the | |
2556 | same time would takes us to the signal handler, then we could | |
2557 | have removed the breakpoint at PC to step over it. However, | |
2558 | some hardware step targets (like e.g., Mac OS) can't step | |
2559 | into signal handlers, and for those, we need to leave the | |
2560 | breakpoint at PC inserted, as otherwise if the handler | |
2561 | recurses and executes PC again, it'll miss the breakpoint. | |
2562 | So we leave the breakpoint inserted anyway, but we need to | |
2563 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2564 | that adjust_pc_after_break doesn't end up confused. |
2565 | ||
2566 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2567 | in one thread after another thread that was stepping had been | |
2568 | momentarily paused for a step-over. When we re-resume the | |
2569 | stepping thread, it may be resumed from that address with a | |
2570 | breakpoint that hasn't trapped yet. Seen with | |
2571 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2572 | do displaced stepping. */ | |
2573 | ||
1eb8556f SM |
2574 | infrun_debug_printf ("resume: [%s] stepped breakpoint", |
2575 | target_pid_to_str (tp->ptid).c_str ()); | |
7f5ef605 PA |
2576 | |
2577 | tp->stepped_breakpoint = 1; | |
2578 | ||
b0f16a3e SM |
2579 | /* Most targets can step a breakpoint instruction, thus |
2580 | executing it normally. But if this one cannot, just | |
2581 | continue and we will hit it anyway. */ | |
7f5ef605 | 2582 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4464ade | 2583 | step = false; |
b0f16a3e | 2584 | } |
ef5cf84e | 2585 | |
b0f16a3e | 2586 | if (debug_displaced |
cb71640d | 2587 | && tp->control.trap_expected |
3fc8eb30 | 2588 | && use_displaced_stepping (tp) |
cb71640d | 2589 | && !step_over_info_valid_p ()) |
b0f16a3e | 2590 | { |
00431a78 | 2591 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2592 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2593 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2594 | gdb_byte buf[4]; | |
2595 | ||
2596 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2597 | paddress (resume_gdbarch, actual_pc)); | |
2598 | read_memory (actual_pc, buf, sizeof (buf)); | |
2599 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2600 | } | |
237fc4c9 | 2601 | |
b0f16a3e SM |
2602 | if (tp->control.may_range_step) |
2603 | { | |
2604 | /* If we're resuming a thread with the PC out of the step | |
2605 | range, then we're doing some nested/finer run control | |
2606 | operation, like stepping the thread out of the dynamic | |
2607 | linker or the displaced stepping scratch pad. We | |
2608 | shouldn't have allowed a range step then. */ | |
2609 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2610 | } | |
c1e36e3e | 2611 | |
64ce06e4 | 2612 | do_target_resume (resume_ptid, step, sig); |
719546c4 | 2613 | tp->resumed = true; |
c906108c | 2614 | } |
71d378ae PA |
2615 | |
2616 | /* Resume the inferior. SIG is the signal to give the inferior | |
2617 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2618 | rolls back state on error. */ | |
2619 | ||
aff4e175 | 2620 | static void |
71d378ae PA |
2621 | resume (gdb_signal sig) |
2622 | { | |
a70b8144 | 2623 | try |
71d378ae PA |
2624 | { |
2625 | resume_1 (sig); | |
2626 | } | |
230d2906 | 2627 | catch (const gdb_exception &ex) |
71d378ae PA |
2628 | { |
2629 | /* If resuming is being aborted for any reason, delete any | |
2630 | single-step breakpoint resume_1 may have created, to avoid | |
2631 | confusing the following resumption, and to avoid leaving | |
2632 | single-step breakpoints perturbing other threads, in case | |
2633 | we're running in non-stop mode. */ | |
2634 | if (inferior_ptid != null_ptid) | |
2635 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2636 | throw; |
71d378ae | 2637 | } |
71d378ae PA |
2638 | } |
2639 | ||
c906108c | 2640 | \f |
237fc4c9 | 2641 | /* Proceeding. */ |
c906108c | 2642 | |
4c2f2a79 PA |
2643 | /* See infrun.h. */ |
2644 | ||
2645 | /* Counter that tracks number of user visible stops. This can be used | |
2646 | to tell whether a command has proceeded the inferior past the | |
2647 | current location. This allows e.g., inferior function calls in | |
2648 | breakpoint commands to not interrupt the command list. When the | |
2649 | call finishes successfully, the inferior is standing at the same | |
2650 | breakpoint as if nothing happened (and so we don't call | |
2651 | normal_stop). */ | |
2652 | static ULONGEST current_stop_id; | |
2653 | ||
2654 | /* See infrun.h. */ | |
2655 | ||
2656 | ULONGEST | |
2657 | get_stop_id (void) | |
2658 | { | |
2659 | return current_stop_id; | |
2660 | } | |
2661 | ||
2662 | /* Called when we report a user visible stop. */ | |
2663 | ||
2664 | static void | |
2665 | new_stop_id (void) | |
2666 | { | |
2667 | current_stop_id++; | |
2668 | } | |
2669 | ||
c906108c SS |
2670 | /* Clear out all variables saying what to do when inferior is continued. |
2671 | First do this, then set the ones you want, then call `proceed'. */ | |
2672 | ||
a7212384 UW |
2673 | static void |
2674 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2675 | { |
1eb8556f | 2676 | infrun_debug_printf ("%s", target_pid_to_str (tp->ptid).c_str ()); |
d6b48e9c | 2677 | |
372316f1 PA |
2678 | /* If we're starting a new sequence, then the previous finished |
2679 | single-step is no longer relevant. */ | |
2680 | if (tp->suspend.waitstatus_pending_p) | |
2681 | { | |
2682 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2683 | { | |
1eb8556f SM |
2684 | infrun_debug_printf ("pending event of %s was a finished step. " |
2685 | "Discarding.", | |
2686 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2687 | |
2688 | tp->suspend.waitstatus_pending_p = 0; | |
2689 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2690 | } | |
1eb8556f | 2691 | else |
372316f1 | 2692 | { |
1eb8556f SM |
2693 | infrun_debug_printf |
2694 | ("thread %s has pending wait status %s (currently_stepping=%d).", | |
2695 | target_pid_to_str (tp->ptid).c_str (), | |
2696 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2697 | currently_stepping (tp)); | |
372316f1 PA |
2698 | } |
2699 | } | |
2700 | ||
70509625 PA |
2701 | /* If this signal should not be seen by program, give it zero. |
2702 | Used for debugging signals. */ | |
2703 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2704 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2705 | ||
46e3ed7f | 2706 | delete tp->thread_fsm; |
243a9253 PA |
2707 | tp->thread_fsm = NULL; |
2708 | ||
16c381f0 JK |
2709 | tp->control.trap_expected = 0; |
2710 | tp->control.step_range_start = 0; | |
2711 | tp->control.step_range_end = 0; | |
c1e36e3e | 2712 | tp->control.may_range_step = 0; |
16c381f0 JK |
2713 | tp->control.step_frame_id = null_frame_id; |
2714 | tp->control.step_stack_frame_id = null_frame_id; | |
2715 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2716 | tp->control.step_start_function = NULL; |
a7212384 | 2717 | tp->stop_requested = 0; |
4e1c45ea | 2718 | |
16c381f0 | 2719 | tp->control.stop_step = 0; |
32400beb | 2720 | |
16c381f0 | 2721 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2722 | |
856e7dd6 | 2723 | tp->control.stepping_command = 0; |
17b2616c | 2724 | |
a7212384 | 2725 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2726 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2727 | } |
32400beb | 2728 | |
a7212384 | 2729 | void |
70509625 | 2730 | clear_proceed_status (int step) |
a7212384 | 2731 | { |
f2665db5 MM |
2732 | /* With scheduler-locking replay, stop replaying other threads if we're |
2733 | not replaying the user-visible resume ptid. | |
2734 | ||
2735 | This is a convenience feature to not require the user to explicitly | |
2736 | stop replaying the other threads. We're assuming that the user's | |
2737 | intent is to resume tracing the recorded process. */ | |
2738 | if (!non_stop && scheduler_mode == schedlock_replay | |
2739 | && target_record_is_replaying (minus_one_ptid) | |
2740 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2741 | execution_direction)) | |
2742 | target_record_stop_replaying (); | |
2743 | ||
08036331 | 2744 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2745 | { |
08036331 | 2746 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2747 | process_stratum_target *resume_target |
2748 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2749 | |
2750 | /* In all-stop mode, delete the per-thread status of all threads | |
2751 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2752 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2753 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2754 | } |
2755 | ||
d7e15655 | 2756 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2757 | { |
2758 | struct inferior *inferior; | |
2759 | ||
2760 | if (non_stop) | |
2761 | { | |
6c95b8df PA |
2762 | /* If in non-stop mode, only delete the per-thread status of |
2763 | the current thread. */ | |
a7212384 UW |
2764 | clear_proceed_status_thread (inferior_thread ()); |
2765 | } | |
6c95b8df | 2766 | |
d6b48e9c | 2767 | inferior = current_inferior (); |
16c381f0 | 2768 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2769 | } |
2770 | ||
76727919 | 2771 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2772 | } |
2773 | ||
99619bea PA |
2774 | /* Returns true if TP is still stopped at a breakpoint that needs |
2775 | stepping-over in order to make progress. If the breakpoint is gone | |
2776 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b | 2777 | |
c4464ade | 2778 | static bool |
6c4cfb24 | 2779 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2780 | { |
2781 | if (tp->stepping_over_breakpoint) | |
2782 | { | |
00431a78 | 2783 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2784 | |
a01bda52 | 2785 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2786 | regcache_read_pc (regcache)) |
2787 | == ordinary_breakpoint_here) | |
c4464ade | 2788 | return true; |
99619bea PA |
2789 | |
2790 | tp->stepping_over_breakpoint = 0; | |
2791 | } | |
2792 | ||
c4464ade | 2793 | return false; |
99619bea PA |
2794 | } |
2795 | ||
6c4cfb24 PA |
2796 | /* Check whether thread TP still needs to start a step-over in order |
2797 | to make progress when resumed. Returns an bitwise or of enum | |
2798 | step_over_what bits, indicating what needs to be stepped over. */ | |
2799 | ||
8d297bbf | 2800 | static step_over_what |
6c4cfb24 PA |
2801 | thread_still_needs_step_over (struct thread_info *tp) |
2802 | { | |
8d297bbf | 2803 | step_over_what what = 0; |
6c4cfb24 PA |
2804 | |
2805 | if (thread_still_needs_step_over_bp (tp)) | |
2806 | what |= STEP_OVER_BREAKPOINT; | |
2807 | ||
2808 | if (tp->stepping_over_watchpoint | |
9aed480c | 2809 | && !target_have_steppable_watchpoint ()) |
6c4cfb24 PA |
2810 | what |= STEP_OVER_WATCHPOINT; |
2811 | ||
2812 | return what; | |
2813 | } | |
2814 | ||
483805cf PA |
2815 | /* Returns true if scheduler locking applies. STEP indicates whether |
2816 | we're about to do a step/next-like command to a thread. */ | |
2817 | ||
c4464ade | 2818 | static bool |
856e7dd6 | 2819 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2820 | { |
2821 | return (scheduler_mode == schedlock_on | |
2822 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2823 | && tp->control.stepping_command) |
2824 | || (scheduler_mode == schedlock_replay | |
2825 | && target_record_will_replay (minus_one_ptid, | |
2826 | execution_direction))); | |
483805cf PA |
2827 | } |
2828 | ||
5b6d1e4f PA |
2829 | /* Calls target_commit_resume on all targets. */ |
2830 | ||
2831 | static void | |
2832 | commit_resume_all_targets () | |
2833 | { | |
2834 | scoped_restore_current_thread restore_thread; | |
2835 | ||
2836 | /* Map between process_target and a representative inferior. This | |
2837 | is to avoid committing a resume in the same target more than | |
2838 | once. Resumptions must be idempotent, so this is an | |
2839 | optimization. */ | |
2840 | std::unordered_map<process_stratum_target *, inferior *> conn_inf; | |
2841 | ||
2842 | for (inferior *inf : all_non_exited_inferiors ()) | |
2843 | if (inf->has_execution ()) | |
2844 | conn_inf[inf->process_target ()] = inf; | |
2845 | ||
2846 | for (const auto &ci : conn_inf) | |
2847 | { | |
2848 | inferior *inf = ci.second; | |
2849 | switch_to_inferior_no_thread (inf); | |
2850 | target_commit_resume (); | |
2851 | } | |
2852 | } | |
2853 | ||
2f4fcf00 PA |
2854 | /* Check that all the targets we're about to resume are in non-stop |
2855 | mode. Ideally, we'd only care whether all targets support | |
2856 | target-async, but we're not there yet. E.g., stop_all_threads | |
2857 | doesn't know how to handle all-stop targets. Also, the remote | |
2858 | protocol in all-stop mode is synchronous, irrespective of | |
2859 | target-async, which means that things like a breakpoint re-set | |
2860 | triggered by one target would try to read memory from all targets | |
2861 | and fail. */ | |
2862 | ||
2863 | static void | |
2864 | check_multi_target_resumption (process_stratum_target *resume_target) | |
2865 | { | |
2866 | if (!non_stop && resume_target == nullptr) | |
2867 | { | |
2868 | scoped_restore_current_thread restore_thread; | |
2869 | ||
2870 | /* This is used to track whether we're resuming more than one | |
2871 | target. */ | |
2872 | process_stratum_target *first_connection = nullptr; | |
2873 | ||
2874 | /* The first inferior we see with a target that does not work in | |
2875 | always-non-stop mode. */ | |
2876 | inferior *first_not_non_stop = nullptr; | |
2877 | ||
2878 | for (inferior *inf : all_non_exited_inferiors (resume_target)) | |
2879 | { | |
2880 | switch_to_inferior_no_thread (inf); | |
2881 | ||
55f6301a | 2882 | if (!target_has_execution ()) |
2f4fcf00 PA |
2883 | continue; |
2884 | ||
2885 | process_stratum_target *proc_target | |
2886 | = current_inferior ()->process_target(); | |
2887 | ||
2888 | if (!target_is_non_stop_p ()) | |
2889 | first_not_non_stop = inf; | |
2890 | ||
2891 | if (first_connection == nullptr) | |
2892 | first_connection = proc_target; | |
2893 | else if (first_connection != proc_target | |
2894 | && first_not_non_stop != nullptr) | |
2895 | { | |
2896 | switch_to_inferior_no_thread (first_not_non_stop); | |
2897 | ||
2898 | proc_target = current_inferior ()->process_target(); | |
2899 | ||
2900 | error (_("Connection %d (%s) does not support " | |
2901 | "multi-target resumption."), | |
2902 | proc_target->connection_number, | |
2903 | make_target_connection_string (proc_target).c_str ()); | |
2904 | } | |
2905 | } | |
2906 | } | |
2907 | } | |
2908 | ||
c906108c SS |
2909 | /* Basic routine for continuing the program in various fashions. |
2910 | ||
2911 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
2912 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
2913 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
2914 | |
2915 | You should call clear_proceed_status before calling proceed. */ | |
2916 | ||
2917 | void | |
64ce06e4 | 2918 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2919 | { |
e58b0e63 PA |
2920 | struct regcache *regcache; |
2921 | struct gdbarch *gdbarch; | |
e58b0e63 | 2922 | CORE_ADDR pc; |
4d9d9d04 PA |
2923 | struct execution_control_state ecss; |
2924 | struct execution_control_state *ecs = &ecss; | |
c4464ade | 2925 | bool started; |
c906108c | 2926 | |
e58b0e63 PA |
2927 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2928 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2929 | resuming the current thread. */ | |
2930 | if (!follow_fork ()) | |
2931 | { | |
2932 | /* The target for some reason decided not to resume. */ | |
2933 | normal_stop (); | |
f148b27e | 2934 | if (target_can_async_p ()) |
b1a35af2 | 2935 | inferior_event_handler (INF_EXEC_COMPLETE); |
e58b0e63 PA |
2936 | return; |
2937 | } | |
2938 | ||
842951eb PA |
2939 | /* We'll update this if & when we switch to a new thread. */ |
2940 | previous_inferior_ptid = inferior_ptid; | |
2941 | ||
e58b0e63 | 2942 | regcache = get_current_regcache (); |
ac7936df | 2943 | gdbarch = regcache->arch (); |
8b86c959 YQ |
2944 | const address_space *aspace = regcache->aspace (); |
2945 | ||
fc75c28b TBA |
2946 | pc = regcache_read_pc_protected (regcache); |
2947 | ||
08036331 | 2948 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 2949 | |
99619bea | 2950 | /* Fill in with reasonable starting values. */ |
08036331 | 2951 | init_thread_stepping_state (cur_thr); |
99619bea | 2952 | |
08036331 | 2953 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 2954 | |
5b6d1e4f PA |
2955 | ptid_t resume_ptid |
2956 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
2957 | process_stratum_target *resume_target | |
2958 | = user_visible_resume_target (resume_ptid); | |
2959 | ||
2f4fcf00 PA |
2960 | check_multi_target_resumption (resume_target); |
2961 | ||
2acceee2 | 2962 | if (addr == (CORE_ADDR) -1) |
c906108c | 2963 | { |
08036331 | 2964 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 2965 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 2966 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2967 | /* There is a breakpoint at the address we will resume at, |
2968 | step one instruction before inserting breakpoints so that | |
2969 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2970 | breakpoint). |
2971 | ||
2972 | Note, we don't do this in reverse, because we won't | |
2973 | actually be executing the breakpoint insn anyway. | |
2974 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 2975 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
2976 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2977 | && gdbarch_single_step_through_delay (gdbarch, | |
2978 | get_current_frame ())) | |
3352ef37 AC |
2979 | /* We stepped onto an instruction that needs to be stepped |
2980 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 2981 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
2982 | } |
2983 | else | |
2984 | { | |
515630c5 | 2985 | regcache_write_pc (regcache, addr); |
c906108c SS |
2986 | } |
2987 | ||
70509625 | 2988 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 2989 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 2990 | |
4d9d9d04 PA |
2991 | /* If an exception is thrown from this point on, make sure to |
2992 | propagate GDB's knowledge of the executing state to the | |
2993 | frontend/user running state. */ | |
5b6d1e4f | 2994 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
2995 | |
2996 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
2997 | threads (e.g., we might need to set threads stepping over | |
2998 | breakpoints first), from the user/frontend's point of view, all | |
2999 | threads in RESUME_PTID are now running. Unless we're calling an | |
3000 | inferior function, as in that case we pretend the inferior | |
3001 | doesn't run at all. */ | |
08036331 | 3002 | if (!cur_thr->control.in_infcall) |
719546c4 | 3003 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3004 | |
1eb8556f SM |
3005 | infrun_debug_printf ("addr=%s, signal=%s", paddress (gdbarch, addr), |
3006 | gdb_signal_to_symbol_string (siggnal)); | |
527159b7 | 3007 | |
4d9d9d04 PA |
3008 | annotate_starting (); |
3009 | ||
3010 | /* Make sure that output from GDB appears before output from the | |
3011 | inferior. */ | |
3012 | gdb_flush (gdb_stdout); | |
3013 | ||
d930703d PA |
3014 | /* Since we've marked the inferior running, give it the terminal. A |
3015 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3016 | still detect attempts to unblock a stuck connection with repeated | |
3017 | Ctrl-C from within target_pass_ctrlc). */ | |
3018 | target_terminal::inferior (); | |
3019 | ||
4d9d9d04 PA |
3020 | /* In a multi-threaded task we may select another thread and |
3021 | then continue or step. | |
3022 | ||
3023 | But if a thread that we're resuming had stopped at a breakpoint, | |
3024 | it will immediately cause another breakpoint stop without any | |
3025 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3026 | we must step over it first. | |
3027 | ||
3028 | Look for threads other than the current (TP) that reported a | |
3029 | breakpoint hit and haven't been resumed yet since. */ | |
3030 | ||
3031 | /* If scheduler locking applies, we can avoid iterating over all | |
3032 | threads. */ | |
08036331 | 3033 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3034 | { |
5b6d1e4f PA |
3035 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3036 | resume_ptid)) | |
08036331 | 3037 | { |
f3f8ece4 PA |
3038 | switch_to_thread_no_regs (tp); |
3039 | ||
4d9d9d04 PA |
3040 | /* Ignore the current thread here. It's handled |
3041 | afterwards. */ | |
08036331 | 3042 | if (tp == cur_thr) |
4d9d9d04 | 3043 | continue; |
c906108c | 3044 | |
4d9d9d04 PA |
3045 | if (!thread_still_needs_step_over (tp)) |
3046 | continue; | |
3047 | ||
3048 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3049 | |
1eb8556f SM |
3050 | infrun_debug_printf ("need to step-over [%s] first", |
3051 | target_pid_to_str (tp->ptid).c_str ()); | |
99619bea | 3052 | |
4d9d9d04 | 3053 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3054 | } |
f3f8ece4 PA |
3055 | |
3056 | switch_to_thread (cur_thr); | |
30852783 UW |
3057 | } |
3058 | ||
4d9d9d04 PA |
3059 | /* Enqueue the current thread last, so that we move all other |
3060 | threads over their breakpoints first. */ | |
08036331 PA |
3061 | if (cur_thr->stepping_over_breakpoint) |
3062 | thread_step_over_chain_enqueue (cur_thr); | |
30852783 | 3063 | |
4d9d9d04 PA |
3064 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3065 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3066 | advanced. Must do this before resuming any thread, as in | |
3067 | all-stop/remote, once we resume we can't send any other packet | |
3068 | until the target stops again. */ | |
fc75c28b | 3069 | cur_thr->prev_pc = regcache_read_pc_protected (regcache); |
99619bea | 3070 | |
a9bc57b9 TT |
3071 | { |
3072 | scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume (); | |
85ad3aaf | 3073 | |
a9bc57b9 | 3074 | started = start_step_over (); |
c906108c | 3075 | |
a9bc57b9 TT |
3076 | if (step_over_info_valid_p ()) |
3077 | { | |
3078 | /* Either this thread started a new in-line step over, or some | |
3079 | other thread was already doing one. In either case, don't | |
3080 | resume anything else until the step-over is finished. */ | |
3081 | } | |
3082 | else if (started && !target_is_non_stop_p ()) | |
3083 | { | |
3084 | /* A new displaced stepping sequence was started. In all-stop, | |
3085 | we can't talk to the target anymore until it next stops. */ | |
3086 | } | |
3087 | else if (!non_stop && target_is_non_stop_p ()) | |
3088 | { | |
3089 | /* In all-stop, but the target is always in non-stop mode. | |
3090 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3091 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3092 | resume_ptid)) | |
3093 | { | |
3094 | switch_to_thread_no_regs (tp); | |
3095 | ||
f9fac3c8 SM |
3096 | if (!tp->inf->has_execution ()) |
3097 | { | |
1eb8556f SM |
3098 | infrun_debug_printf ("[%s] target has no execution", |
3099 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3100 | continue; |
3101 | } | |
f3f8ece4 | 3102 | |
f9fac3c8 SM |
3103 | if (tp->resumed) |
3104 | { | |
1eb8556f SM |
3105 | infrun_debug_printf ("[%s] resumed", |
3106 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3107 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
3108 | continue; | |
3109 | } | |
fbea99ea | 3110 | |
f9fac3c8 SM |
3111 | if (thread_is_in_step_over_chain (tp)) |
3112 | { | |
1eb8556f SM |
3113 | infrun_debug_printf ("[%s] needs step-over", |
3114 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3115 | continue; |
3116 | } | |
fbea99ea | 3117 | |
1eb8556f SM |
3118 | infrun_debug_printf ("resuming %s", |
3119 | target_pid_to_str (tp->ptid).c_str ()); | |
fbea99ea | 3120 | |
f9fac3c8 SM |
3121 | reset_ecs (ecs, tp); |
3122 | switch_to_thread (tp); | |
3123 | keep_going_pass_signal (ecs); | |
3124 | if (!ecs->wait_some_more) | |
3125 | error (_("Command aborted.")); | |
3126 | } | |
a9bc57b9 | 3127 | } |
08036331 | 3128 | else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3129 | { |
3130 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3131 | reset_ecs (ecs, cur_thr); |
3132 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3133 | keep_going_pass_signal (ecs); |
3134 | if (!ecs->wait_some_more) | |
3135 | error (_("Command aborted.")); | |
3136 | } | |
3137 | } | |
c906108c | 3138 | |
5b6d1e4f | 3139 | commit_resume_all_targets (); |
85ad3aaf | 3140 | |
731f534f | 3141 | finish_state.release (); |
c906108c | 3142 | |
873657b9 PA |
3143 | /* If we've switched threads above, switch back to the previously |
3144 | current thread. We don't want the user to see a different | |
3145 | selected thread. */ | |
3146 | switch_to_thread (cur_thr); | |
3147 | ||
0b333c5e PA |
3148 | /* Tell the event loop to wait for it to stop. If the target |
3149 | supports asynchronous execution, it'll do this from within | |
3150 | target_resume. */ | |
362646f5 | 3151 | if (!target_can_async_p ()) |
0b333c5e | 3152 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3153 | } |
c906108c SS |
3154 | \f |
3155 | ||
3156 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3157 | |
c906108c | 3158 | void |
8621d6a9 | 3159 | start_remote (int from_tty) |
c906108c | 3160 | { |
5b6d1e4f PA |
3161 | inferior *inf = current_inferior (); |
3162 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3163 | |
1777feb0 | 3164 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3165 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3166 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3167 | nothing is returned (instead of just blocking). Because of this, |
3168 | targets expecting an immediate response need to, internally, set | |
3169 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3170 | timeout. */ |
6426a772 JM |
3171 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3172 | differentiate to its caller what the state of the target is after | |
3173 | the initial open has been performed. Here we're assuming that | |
3174 | the target has stopped. It should be possible to eventually have | |
3175 | target_open() return to the caller an indication that the target | |
3176 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3177 | for an async run. */ |
5b6d1e4f | 3178 | wait_for_inferior (inf); |
8621d6a9 DJ |
3179 | |
3180 | /* Now that the inferior has stopped, do any bookkeeping like | |
3181 | loading shared libraries. We want to do this before normal_stop, | |
3182 | so that the displayed frame is up to date. */ | |
a7aba266 | 3183 | post_create_inferior (from_tty); |
8621d6a9 | 3184 | |
6426a772 | 3185 | normal_stop (); |
c906108c SS |
3186 | } |
3187 | ||
3188 | /* Initialize static vars when a new inferior begins. */ | |
3189 | ||
3190 | void | |
96baa820 | 3191 | init_wait_for_inferior (void) |
c906108c SS |
3192 | { |
3193 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3194 | |
c906108c SS |
3195 | breakpoint_init_inferior (inf_starting); |
3196 | ||
70509625 | 3197 | clear_proceed_status (0); |
9f976b41 | 3198 | |
ab1ddbcf | 3199 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3200 | |
842951eb | 3201 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3202 | } |
237fc4c9 | 3203 | |
c906108c | 3204 | \f |
488f131b | 3205 | |
ec9499be | 3206 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3207 | |
568d6575 UW |
3208 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3209 | struct execution_control_state *ecs); | |
3210 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3211 | struct execution_control_state *ecs); | |
4f5d7f63 | 3212 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3213 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3214 | struct frame_info *); |
611c83ae | 3215 | |
bdc36728 | 3216 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3217 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3218 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3219 | static void process_event_stop_test (struct execution_control_state *ecs); |
c4464ade | 3220 | static bool switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3221 | |
252fbfc8 PA |
3222 | /* This function is attached as a "thread_stop_requested" observer. |
3223 | Cleanup local state that assumed the PTID was to be resumed, and | |
3224 | report the stop to the frontend. */ | |
3225 | ||
2c0b251b | 3226 | static void |
252fbfc8 PA |
3227 | infrun_thread_stop_requested (ptid_t ptid) |
3228 | { | |
5b6d1e4f PA |
3229 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3230 | ||
c65d6b55 PA |
3231 | /* PTID was requested to stop. If the thread was already stopped, |
3232 | but the user/frontend doesn't know about that yet (e.g., the | |
3233 | thread had been temporarily paused for some step-over), set up | |
3234 | for reporting the stop now. */ | |
5b6d1e4f | 3235 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3236 | { |
3237 | if (tp->state != THREAD_RUNNING) | |
3238 | continue; | |
3239 | if (tp->executing) | |
3240 | continue; | |
c65d6b55 | 3241 | |
08036331 PA |
3242 | /* Remove matching threads from the step-over queue, so |
3243 | start_step_over doesn't try to resume them | |
3244 | automatically. */ | |
3245 | if (thread_is_in_step_over_chain (tp)) | |
3246 | thread_step_over_chain_remove (tp); | |
c65d6b55 | 3247 | |
08036331 PA |
3248 | /* If the thread is stopped, but the user/frontend doesn't |
3249 | know about that yet, queue a pending event, as if the | |
3250 | thread had just stopped now. Unless the thread already had | |
3251 | a pending event. */ | |
3252 | if (!tp->suspend.waitstatus_pending_p) | |
3253 | { | |
3254 | tp->suspend.waitstatus_pending_p = 1; | |
3255 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3256 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3257 | } | |
c65d6b55 | 3258 | |
08036331 PA |
3259 | /* Clear the inline-frame state, since we're re-processing the |
3260 | stop. */ | |
5b6d1e4f | 3261 | clear_inline_frame_state (tp); |
c65d6b55 | 3262 | |
08036331 PA |
3263 | /* If this thread was paused because some other thread was |
3264 | doing an inline-step over, let that finish first. Once | |
3265 | that happens, we'll restart all threads and consume pending | |
3266 | stop events then. */ | |
3267 | if (step_over_info_valid_p ()) | |
3268 | continue; | |
3269 | ||
3270 | /* Otherwise we can process the (new) pending event now. Set | |
3271 | it so this pending event is considered by | |
3272 | do_target_wait. */ | |
719546c4 | 3273 | tp->resumed = true; |
08036331 | 3274 | } |
252fbfc8 PA |
3275 | } |
3276 | ||
a07daef3 PA |
3277 | static void |
3278 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3279 | { | |
5b6d1e4f PA |
3280 | if (target_last_proc_target == tp->inf->process_target () |
3281 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3282 | nullify_last_target_wait_ptid (); |
3283 | } | |
3284 | ||
0cbcdb96 PA |
3285 | /* Delete the step resume, single-step and longjmp/exception resume |
3286 | breakpoints of TP. */ | |
4e1c45ea | 3287 | |
0cbcdb96 PA |
3288 | static void |
3289 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3290 | { |
0cbcdb96 PA |
3291 | delete_step_resume_breakpoint (tp); |
3292 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3293 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3294 | } |
3295 | ||
0cbcdb96 PA |
3296 | /* If the target still has execution, call FUNC for each thread that |
3297 | just stopped. In all-stop, that's all the non-exited threads; in | |
3298 | non-stop, that's the current thread, only. */ | |
3299 | ||
3300 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3301 | (struct thread_info *tp); | |
4e1c45ea PA |
3302 | |
3303 | static void | |
0cbcdb96 | 3304 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3305 | { |
55f6301a | 3306 | if (!target_has_execution () || inferior_ptid == null_ptid) |
4e1c45ea PA |
3307 | return; |
3308 | ||
fbea99ea | 3309 | if (target_is_non_stop_p ()) |
4e1c45ea | 3310 | { |
0cbcdb96 PA |
3311 | /* If in non-stop mode, only the current thread stopped. */ |
3312 | func (inferior_thread ()); | |
4e1c45ea PA |
3313 | } |
3314 | else | |
0cbcdb96 | 3315 | { |
0cbcdb96 | 3316 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3317 | for (thread_info *tp : all_non_exited_threads ()) |
3318 | func (tp); | |
0cbcdb96 PA |
3319 | } |
3320 | } | |
3321 | ||
3322 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3323 | the threads that just stopped. */ | |
3324 | ||
3325 | static void | |
3326 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3327 | { | |
3328 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3329 | } |
3330 | ||
3331 | /* Delete the single-step breakpoints of the threads that just | |
3332 | stopped. */ | |
7c16b83e | 3333 | |
34b7e8a6 PA |
3334 | static void |
3335 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3336 | { | |
3337 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3338 | } |
3339 | ||
221e1a37 | 3340 | /* See infrun.h. */ |
223698f8 | 3341 | |
221e1a37 | 3342 | void |
223698f8 DE |
3343 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3344 | const struct target_waitstatus *ws) | |
3345 | { | |
23fdd69e | 3346 | std::string status_string = target_waitstatus_to_string (ws); |
d7e74731 | 3347 | string_file stb; |
223698f8 DE |
3348 | |
3349 | /* The text is split over several lines because it was getting too long. | |
3350 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3351 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3352 | is set. */ | |
3353 | ||
1eb8556f | 3354 | stb.printf ("[infrun] target_wait (%d.%ld.%ld", |
e99b03dc | 3355 | waiton_ptid.pid (), |
e38504b3 | 3356 | waiton_ptid.lwp (), |
cc6bcb54 | 3357 | waiton_ptid.tid ()); |
e99b03dc | 3358 | if (waiton_ptid.pid () != -1) |
a068643d | 3359 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid).c_str ()); |
d7e74731 | 3360 | stb.printf (", status) =\n"); |
1eb8556f | 3361 | stb.printf ("[infrun] %d.%ld.%ld [%s],\n", |
e99b03dc | 3362 | result_ptid.pid (), |
e38504b3 | 3363 | result_ptid.lwp (), |
cc6bcb54 | 3364 | result_ptid.tid (), |
a068643d | 3365 | target_pid_to_str (result_ptid).c_str ()); |
1eb8556f | 3366 | stb.printf ("[infrun] %s\n", status_string.c_str ()); |
223698f8 DE |
3367 | |
3368 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3369 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3370 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3371 | } |
3372 | ||
372316f1 PA |
3373 | /* Select a thread at random, out of those which are resumed and have |
3374 | had events. */ | |
3375 | ||
3376 | static struct thread_info * | |
5b6d1e4f | 3377 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3378 | { |
372316f1 | 3379 | int num_events = 0; |
08036331 | 3380 | |
5b6d1e4f | 3381 | auto has_event = [&] (thread_info *tp) |
08036331 | 3382 | { |
5b6d1e4f PA |
3383 | return (tp->ptid.matches (waiton_ptid) |
3384 | && tp->resumed | |
08036331 PA |
3385 | && tp->suspend.waitstatus_pending_p); |
3386 | }; | |
372316f1 PA |
3387 | |
3388 | /* First see how many events we have. Count only resumed threads | |
3389 | that have an event pending. */ | |
5b6d1e4f | 3390 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3391 | if (has_event (tp)) |
372316f1 PA |
3392 | num_events++; |
3393 | ||
3394 | if (num_events == 0) | |
3395 | return NULL; | |
3396 | ||
3397 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3398 | int random_selector = (int) ((num_events * (double) rand ()) |
3399 | / (RAND_MAX + 1.0)); | |
372316f1 | 3400 | |
1eb8556f SM |
3401 | if (num_events > 1) |
3402 | infrun_debug_printf ("Found %d events, selecting #%d", | |
3403 | num_events, random_selector); | |
372316f1 PA |
3404 | |
3405 | /* Select the Nth thread that has had an event. */ | |
5b6d1e4f | 3406 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3407 | if (has_event (tp)) |
372316f1 | 3408 | if (random_selector-- == 0) |
08036331 | 3409 | return tp; |
372316f1 | 3410 | |
08036331 | 3411 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3412 | } |
3413 | ||
3414 | /* Wrapper for target_wait that first checks whether threads have | |
3415 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3416 | more events. INF is the inferior we're using to call target_wait |
3417 | on. */ | |
372316f1 PA |
3418 | |
3419 | static ptid_t | |
5b6d1e4f | 3420 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
b60cea74 | 3421 | target_waitstatus *status, target_wait_flags options) |
372316f1 PA |
3422 | { |
3423 | ptid_t event_ptid; | |
3424 | struct thread_info *tp; | |
3425 | ||
24ed6739 AB |
3426 | /* We know that we are looking for an event in the target of inferior |
3427 | INF, but we don't know which thread the event might come from. As | |
3428 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3429 | the wait code relies on it - doing so is always a mistake. */ | |
3430 | switch_to_inferior_no_thread (inf); | |
3431 | ||
372316f1 PA |
3432 | /* First check if there is a resumed thread with a wait status |
3433 | pending. */ | |
d7e15655 | 3434 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3435 | { |
5b6d1e4f | 3436 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3437 | } |
3438 | else | |
3439 | { | |
1eb8556f SM |
3440 | infrun_debug_printf ("Waiting for specific thread %s.", |
3441 | target_pid_to_str (ptid).c_str ()); | |
372316f1 PA |
3442 | |
3443 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3444 | tp = find_thread_ptid (inf, ptid); |
372316f1 PA |
3445 | gdb_assert (tp != NULL); |
3446 | if (!tp->suspend.waitstatus_pending_p) | |
3447 | tp = NULL; | |
3448 | } | |
3449 | ||
3450 | if (tp != NULL | |
3451 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3452 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3453 | { | |
00431a78 | 3454 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3455 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3456 | CORE_ADDR pc; |
3457 | int discard = 0; | |
3458 | ||
3459 | pc = regcache_read_pc (regcache); | |
3460 | ||
3461 | if (pc != tp->suspend.stop_pc) | |
3462 | { | |
1eb8556f SM |
3463 | infrun_debug_printf ("PC of %s changed. was=%s, now=%s", |
3464 | target_pid_to_str (tp->ptid).c_str (), | |
3465 | paddress (gdbarch, tp->suspend.stop_pc), | |
3466 | paddress (gdbarch, pc)); | |
372316f1 PA |
3467 | discard = 1; |
3468 | } | |
a01bda52 | 3469 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 | 3470 | { |
1eb8556f SM |
3471 | infrun_debug_printf ("previous breakpoint of %s, at %s gone", |
3472 | target_pid_to_str (tp->ptid).c_str (), | |
3473 | paddress (gdbarch, pc)); | |
372316f1 PA |
3474 | |
3475 | discard = 1; | |
3476 | } | |
3477 | ||
3478 | if (discard) | |
3479 | { | |
1eb8556f SM |
3480 | infrun_debug_printf ("pending event of %s cancelled.", |
3481 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3482 | |
3483 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3484 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3485 | } | |
3486 | } | |
3487 | ||
3488 | if (tp != NULL) | |
3489 | { | |
1eb8556f SM |
3490 | infrun_debug_printf ("Using pending wait status %s for %s.", |
3491 | target_waitstatus_to_string | |
3492 | (&tp->suspend.waitstatus).c_str (), | |
3493 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3494 | |
3495 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3496 | if it was a software breakpoint (and the target doesn't | |
3497 | always adjust the PC itself). */ | |
3498 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3499 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3500 | { | |
3501 | struct regcache *regcache; | |
3502 | struct gdbarch *gdbarch; | |
3503 | int decr_pc; | |
3504 | ||
00431a78 | 3505 | regcache = get_thread_regcache (tp); |
ac7936df | 3506 | gdbarch = regcache->arch (); |
372316f1 PA |
3507 | |
3508 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3509 | if (decr_pc != 0) | |
3510 | { | |
3511 | CORE_ADDR pc; | |
3512 | ||
3513 | pc = regcache_read_pc (regcache); | |
3514 | regcache_write_pc (regcache, pc + decr_pc); | |
3515 | } | |
3516 | } | |
3517 | ||
3518 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3519 | *status = tp->suspend.waitstatus; | |
3520 | tp->suspend.waitstatus_pending_p = 0; | |
3521 | ||
3522 | /* Wake up the event loop again, until all pending events are | |
3523 | processed. */ | |
3524 | if (target_is_async_p ()) | |
3525 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3526 | return tp->ptid; | |
3527 | } | |
3528 | ||
3529 | /* But if we don't find one, we'll have to wait. */ | |
3530 | ||
d3a07122 SM |
3531 | /* We can't ask a non-async target to do a non-blocking wait, so this will be |
3532 | a blocking wait. */ | |
3533 | if (!target_can_async_p ()) | |
3534 | options &= ~TARGET_WNOHANG; | |
3535 | ||
372316f1 PA |
3536 | if (deprecated_target_wait_hook) |
3537 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3538 | else | |
3539 | event_ptid = target_wait (ptid, status, options); | |
3540 | ||
3541 | return event_ptid; | |
3542 | } | |
3543 | ||
5b6d1e4f PA |
3544 | /* Wrapper for target_wait that first checks whether threads have |
3545 | pending statuses to report before actually asking the target for | |
b3e3a4c1 | 3546 | more events. Polls for events from all inferiors/targets. */ |
5b6d1e4f PA |
3547 | |
3548 | static bool | |
b60cea74 TT |
3549 | do_target_wait (ptid_t wait_ptid, execution_control_state *ecs, |
3550 | target_wait_flags options) | |
5b6d1e4f PA |
3551 | { |
3552 | int num_inferiors = 0; | |
3553 | int random_selector; | |
3554 | ||
b3e3a4c1 SM |
3555 | /* For fairness, we pick the first inferior/target to poll at random |
3556 | out of all inferiors that may report events, and then continue | |
3557 | polling the rest of the inferior list starting from that one in a | |
3558 | circular fashion until the whole list is polled once. */ | |
5b6d1e4f PA |
3559 | |
3560 | auto inferior_matches = [&wait_ptid] (inferior *inf) | |
3561 | { | |
3562 | return (inf->process_target () != NULL | |
5b6d1e4f PA |
3563 | && ptid_t (inf->pid).matches (wait_ptid)); |
3564 | }; | |
3565 | ||
b3e3a4c1 | 3566 | /* First see how many matching inferiors we have. */ |
5b6d1e4f PA |
3567 | for (inferior *inf : all_inferiors ()) |
3568 | if (inferior_matches (inf)) | |
3569 | num_inferiors++; | |
3570 | ||
3571 | if (num_inferiors == 0) | |
3572 | { | |
3573 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3574 | return false; | |
3575 | } | |
3576 | ||
b3e3a4c1 | 3577 | /* Now randomly pick an inferior out of those that matched. */ |
5b6d1e4f PA |
3578 | random_selector = (int) |
3579 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3580 | ||
1eb8556f SM |
3581 | if (num_inferiors > 1) |
3582 | infrun_debug_printf ("Found %d inferiors, starting at #%d", | |
3583 | num_inferiors, random_selector); | |
5b6d1e4f | 3584 | |
b3e3a4c1 | 3585 | /* Select the Nth inferior that matched. */ |
5b6d1e4f PA |
3586 | |
3587 | inferior *selected = nullptr; | |
3588 | ||
3589 | for (inferior *inf : all_inferiors ()) | |
3590 | if (inferior_matches (inf)) | |
3591 | if (random_selector-- == 0) | |
3592 | { | |
3593 | selected = inf; | |
3594 | break; | |
3595 | } | |
3596 | ||
b3e3a4c1 | 3597 | /* Now poll for events out of each of the matching inferior's |
5b6d1e4f PA |
3598 | targets, starting from the selected one. */ |
3599 | ||
3600 | auto do_wait = [&] (inferior *inf) | |
3601 | { | |
5b6d1e4f PA |
3602 | ecs->ptid = do_target_wait_1 (inf, wait_ptid, &ecs->ws, options); |
3603 | ecs->target = inf->process_target (); | |
3604 | return (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3605 | }; | |
3606 | ||
b3e3a4c1 SM |
3607 | /* Needed in 'all-stop + target-non-stop' mode, because we end up |
3608 | here spuriously after the target is all stopped and we've already | |
5b6d1e4f PA |
3609 | reported the stop to the user, polling for events. */ |
3610 | scoped_restore_current_thread restore_thread; | |
3611 | ||
3612 | int inf_num = selected->num; | |
3613 | for (inferior *inf = selected; inf != NULL; inf = inf->next) | |
3614 | if (inferior_matches (inf)) | |
3615 | if (do_wait (inf)) | |
3616 | return true; | |
3617 | ||
3618 | for (inferior *inf = inferior_list; | |
3619 | inf != NULL && inf->num < inf_num; | |
3620 | inf = inf->next) | |
3621 | if (inferior_matches (inf)) | |
3622 | if (do_wait (inf)) | |
3623 | return true; | |
3624 | ||
3625 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3626 | return false; | |
3627 | } | |
3628 | ||
24291992 PA |
3629 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3630 | detaching while a thread is displaced stepping is a recipe for | |
3631 | crashing it, as nothing would readjust the PC out of the scratch | |
3632 | pad. */ | |
3633 | ||
3634 | void | |
3635 | prepare_for_detach (void) | |
3636 | { | |
3637 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3638 | ptid_t pid_ptid = ptid_t (inf->pid); |
24291992 | 3639 | |
00431a78 | 3640 | displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf); |
24291992 PA |
3641 | |
3642 | /* Is any thread of this process displaced stepping? If not, | |
3643 | there's nothing else to do. */ | |
d20172fc | 3644 | if (displaced->step_thread == nullptr) |
24291992 PA |
3645 | return; |
3646 | ||
1eb8556f | 3647 | infrun_debug_printf ("displaced-stepping in-process while detaching"); |
24291992 | 3648 | |
9bcb1f16 | 3649 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3650 | |
00431a78 | 3651 | while (displaced->step_thread != nullptr) |
24291992 | 3652 | { |
24291992 PA |
3653 | struct execution_control_state ecss; |
3654 | struct execution_control_state *ecs; | |
3655 | ||
3656 | ecs = &ecss; | |
3657 | memset (ecs, 0, sizeof (*ecs)); | |
3658 | ||
3659 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3660 | /* Flush target cache before starting to handle each event. |
3661 | Target was running and cache could be stale. This is just a | |
3662 | heuristic. Running threads may modify target memory, but we | |
3663 | don't get any event. */ | |
3664 | target_dcache_invalidate (); | |
24291992 | 3665 | |
5b6d1e4f | 3666 | do_target_wait (pid_ptid, ecs, 0); |
24291992 PA |
3667 | |
3668 | if (debug_infrun) | |
3669 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3670 | ||
3671 | /* If an error happens while handling the event, propagate GDB's | |
3672 | knowledge of the executing state to the frontend/user running | |
3673 | state. */ | |
5b6d1e4f PA |
3674 | scoped_finish_thread_state finish_state (inf->process_target (), |
3675 | minus_one_ptid); | |
24291992 PA |
3676 | |
3677 | /* Now figure out what to do with the result of the result. */ | |
3678 | handle_inferior_event (ecs); | |
3679 | ||
3680 | /* No error, don't finish the state yet. */ | |
731f534f | 3681 | finish_state.release (); |
24291992 PA |
3682 | |
3683 | /* Breakpoints and watchpoints are not installed on the target | |
3684 | at this point, and signals are passed directly to the | |
3685 | inferior, so this must mean the process is gone. */ | |
3686 | if (!ecs->wait_some_more) | |
3687 | { | |
9bcb1f16 | 3688 | restore_detaching.release (); |
24291992 PA |
3689 | error (_("Program exited while detaching")); |
3690 | } | |
3691 | } | |
3692 | ||
9bcb1f16 | 3693 | restore_detaching.release (); |
24291992 PA |
3694 | } |
3695 | ||
cd0fc7c3 | 3696 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3697 | |
cd0fc7c3 SS |
3698 | If inferior gets a signal, we may decide to start it up again |
3699 | instead of returning. That is why there is a loop in this function. | |
3700 | When this function actually returns it means the inferior | |
3701 | should be left stopped and GDB should read more commands. */ | |
3702 | ||
5b6d1e4f PA |
3703 | static void |
3704 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3705 | { |
1eb8556f | 3706 | infrun_debug_printf ("wait_for_inferior ()"); |
527159b7 | 3707 | |
4c41382a | 3708 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3709 | |
e6f5c25b PA |
3710 | /* If an error happens while handling the event, propagate GDB's |
3711 | knowledge of the executing state to the frontend/user running | |
3712 | state. */ | |
5b6d1e4f PA |
3713 | scoped_finish_thread_state finish_state |
3714 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 3715 | |
c906108c SS |
3716 | while (1) |
3717 | { | |
ae25568b PA |
3718 | struct execution_control_state ecss; |
3719 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 3720 | |
ae25568b PA |
3721 | memset (ecs, 0, sizeof (*ecs)); |
3722 | ||
ec9499be | 3723 | overlay_cache_invalid = 1; |
ec9499be | 3724 | |
f15cb84a YQ |
3725 | /* Flush target cache before starting to handle each event. |
3726 | Target was running and cache could be stale. This is just a | |
3727 | heuristic. Running threads may modify target memory, but we | |
3728 | don't get any event. */ | |
3729 | target_dcache_invalidate (); | |
3730 | ||
5b6d1e4f PA |
3731 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
3732 | ecs->target = inf->process_target (); | |
c906108c | 3733 | |
f00150c9 | 3734 | if (debug_infrun) |
5b6d1e4f | 3735 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3736 | |
cd0fc7c3 SS |
3737 | /* Now figure out what to do with the result of the result. */ |
3738 | handle_inferior_event (ecs); | |
c906108c | 3739 | |
cd0fc7c3 SS |
3740 | if (!ecs->wait_some_more) |
3741 | break; | |
3742 | } | |
4e1c45ea | 3743 | |
e6f5c25b | 3744 | /* No error, don't finish the state yet. */ |
731f534f | 3745 | finish_state.release (); |
cd0fc7c3 | 3746 | } |
c906108c | 3747 | |
d3d4baed PA |
3748 | /* Cleanup that reinstalls the readline callback handler, if the |
3749 | target is running in the background. If while handling the target | |
3750 | event something triggered a secondary prompt, like e.g., a | |
3751 | pagination prompt, we'll have removed the callback handler (see | |
3752 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3753 | event loop, ready to process further input. Note this has no | |
3754 | effect if the handler hasn't actually been removed, because calling | |
3755 | rl_callback_handler_install resets the line buffer, thus losing | |
3756 | input. */ | |
3757 | ||
3758 | static void | |
d238133d | 3759 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 3760 | { |
3b12939d PA |
3761 | struct ui *ui = current_ui; |
3762 | ||
3763 | if (!ui->async) | |
6c400b59 PA |
3764 | { |
3765 | /* We're not going back to the top level event loop yet. Don't | |
3766 | install the readline callback, as it'd prep the terminal, | |
3767 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3768 | it the next time the prompt is displayed, when we're ready | |
3769 | for input. */ | |
3770 | return; | |
3771 | } | |
3772 | ||
3b12939d | 3773 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3774 | gdb_rl_callback_handler_reinstall (); |
3775 | } | |
3776 | ||
243a9253 PA |
3777 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3778 | that's just the event thread. In all-stop, that's all threads. */ | |
3779 | ||
3780 | static void | |
3781 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3782 | { | |
08036331 PA |
3783 | if (ecs->event_thread != NULL |
3784 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 3785 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
3786 | |
3787 | if (!non_stop) | |
3788 | { | |
08036331 | 3789 | for (thread_info *thr : all_non_exited_threads ()) |
243a9253 PA |
3790 | { |
3791 | if (thr->thread_fsm == NULL) | |
3792 | continue; | |
3793 | if (thr == ecs->event_thread) | |
3794 | continue; | |
3795 | ||
00431a78 | 3796 | switch_to_thread (thr); |
46e3ed7f | 3797 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
3798 | } |
3799 | ||
3800 | if (ecs->event_thread != NULL) | |
00431a78 | 3801 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3802 | } |
3803 | } | |
3804 | ||
3b12939d PA |
3805 | /* Helper for all_uis_check_sync_execution_done that works on the |
3806 | current UI. */ | |
3807 | ||
3808 | static void | |
3809 | check_curr_ui_sync_execution_done (void) | |
3810 | { | |
3811 | struct ui *ui = current_ui; | |
3812 | ||
3813 | if (ui->prompt_state == PROMPT_NEEDED | |
3814 | && ui->async | |
3815 | && !gdb_in_secondary_prompt_p (ui)) | |
3816 | { | |
223ffa71 | 3817 | target_terminal::ours (); |
76727919 | 3818 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3819 | ui_register_input_event_handler (ui); |
3b12939d PA |
3820 | } |
3821 | } | |
3822 | ||
3823 | /* See infrun.h. */ | |
3824 | ||
3825 | void | |
3826 | all_uis_check_sync_execution_done (void) | |
3827 | { | |
0e454242 | 3828 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3829 | { |
3830 | check_curr_ui_sync_execution_done (); | |
3831 | } | |
3832 | } | |
3833 | ||
a8836c93 PA |
3834 | /* See infrun.h. */ |
3835 | ||
3836 | void | |
3837 | all_uis_on_sync_execution_starting (void) | |
3838 | { | |
0e454242 | 3839 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3840 | { |
3841 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3842 | async_disable_stdin (); | |
3843 | } | |
3844 | } | |
3845 | ||
1777feb0 | 3846 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3847 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3848 | descriptor corresponding to the target. It can be called more than |
3849 | once to complete a single execution command. In such cases we need | |
3850 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3851 | that this function is called for a single execution command, then |
3852 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3853 | necessary cleanups. */ |
43ff13b4 JM |
3854 | |
3855 | void | |
b1a35af2 | 3856 | fetch_inferior_event () |
43ff13b4 | 3857 | { |
0d1e5fa7 | 3858 | struct execution_control_state ecss; |
a474d7c2 | 3859 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 3860 | int cmd_done = 0; |
43ff13b4 | 3861 | |
0d1e5fa7 PA |
3862 | memset (ecs, 0, sizeof (*ecs)); |
3863 | ||
c61db772 PA |
3864 | /* Events are always processed with the main UI as current UI. This |
3865 | way, warnings, debug output, etc. are always consistently sent to | |
3866 | the main console. */ | |
4b6749b9 | 3867 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3868 | |
b78b3a29 TBA |
3869 | /* Temporarily disable pagination. Otherwise, the user would be |
3870 | given an option to press 'q' to quit, which would cause an early | |
3871 | exit and could leave GDB in a half-baked state. */ | |
3872 | scoped_restore save_pagination | |
3873 | = make_scoped_restore (&pagination_enabled, false); | |
3874 | ||
d3d4baed | 3875 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
3876 | { |
3877 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
3878 | ||
3879 | /* We're handling a live event, so make sure we're doing live | |
3880 | debugging. If we're looking at traceframes while the target is | |
3881 | running, we're going to need to get back to that mode after | |
3882 | handling the event. */ | |
3883 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
3884 | if (non_stop) | |
3885 | { | |
3886 | maybe_restore_traceframe.emplace (); | |
3887 | set_current_traceframe (-1); | |
3888 | } | |
43ff13b4 | 3889 | |
873657b9 PA |
3890 | /* The user/frontend should not notice a thread switch due to |
3891 | internal events. Make sure we revert to the user selected | |
3892 | thread and frame after handling the event and running any | |
3893 | breakpoint commands. */ | |
3894 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
3895 | |
3896 | overlay_cache_invalid = 1; | |
3897 | /* Flush target cache before starting to handle each event. Target | |
3898 | was running and cache could be stale. This is just a heuristic. | |
3899 | Running threads may modify target memory, but we don't get any | |
3900 | event. */ | |
3901 | target_dcache_invalidate (); | |
3902 | ||
3903 | scoped_restore save_exec_dir | |
3904 | = make_scoped_restore (&execution_direction, | |
3905 | target_execution_direction ()); | |
3906 | ||
5b6d1e4f PA |
3907 | if (!do_target_wait (minus_one_ptid, ecs, TARGET_WNOHANG)) |
3908 | return; | |
3909 | ||
3910 | gdb_assert (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3911 | ||
3912 | /* Switch to the target that generated the event, so we can do | |
7f08fd51 TBA |
3913 | target calls. */ |
3914 | switch_to_target_no_thread (ecs->target); | |
d238133d TT |
3915 | |
3916 | if (debug_infrun) | |
5b6d1e4f | 3917 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
d238133d TT |
3918 | |
3919 | /* If an error happens while handling the event, propagate GDB's | |
3920 | knowledge of the executing state to the frontend/user running | |
3921 | state. */ | |
3922 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 3923 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 3924 | |
979a0d13 | 3925 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
3926 | still for the thread which has thrown the exception. */ |
3927 | auto defer_bpstat_clear | |
3928 | = make_scope_exit (bpstat_clear_actions); | |
3929 | auto defer_delete_threads | |
3930 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
3931 | ||
3932 | /* Now figure out what to do with the result of the result. */ | |
3933 | handle_inferior_event (ecs); | |
3934 | ||
3935 | if (!ecs->wait_some_more) | |
3936 | { | |
5b6d1e4f | 3937 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
d238133d TT |
3938 | int should_stop = 1; |
3939 | struct thread_info *thr = ecs->event_thread; | |
d6b48e9c | 3940 | |
d238133d | 3941 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3942 | |
d238133d TT |
3943 | if (thr != NULL) |
3944 | { | |
3945 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 3946 | |
d238133d | 3947 | if (thread_fsm != NULL) |
46e3ed7f | 3948 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 3949 | } |
243a9253 | 3950 | |
d238133d TT |
3951 | if (!should_stop) |
3952 | { | |
3953 | keep_going (ecs); | |
3954 | } | |
3955 | else | |
3956 | { | |
46e3ed7f | 3957 | bool should_notify_stop = true; |
d238133d | 3958 | int proceeded = 0; |
1840d81a | 3959 | |
d238133d | 3960 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 3961 | |
d238133d | 3962 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 3963 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 3964 | |
d238133d TT |
3965 | if (should_notify_stop) |
3966 | { | |
3967 | /* We may not find an inferior if this was a process exit. */ | |
3968 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
3969 | proceeded = normal_stop (); | |
3970 | } | |
243a9253 | 3971 | |
d238133d TT |
3972 | if (!proceeded) |
3973 | { | |
b1a35af2 | 3974 | inferior_event_handler (INF_EXEC_COMPLETE); |
d238133d TT |
3975 | cmd_done = 1; |
3976 | } | |
873657b9 PA |
3977 | |
3978 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
3979 | previously selected thread is gone. We have two | |
3980 | choices - switch to no thread selected, or restore the | |
3981 | previously selected thread (now exited). We chose the | |
3982 | later, just because that's what GDB used to do. After | |
3983 | this, "info threads" says "The current thread <Thread | |
3984 | ID 2> has terminated." instead of "No thread | |
3985 | selected.". */ | |
3986 | if (!non_stop | |
3987 | && cmd_done | |
3988 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
3989 | restore_thread.dont_restore (); | |
d238133d TT |
3990 | } |
3991 | } | |
4f8d22e3 | 3992 | |
d238133d TT |
3993 | defer_delete_threads.release (); |
3994 | defer_bpstat_clear.release (); | |
29f49a6a | 3995 | |
d238133d TT |
3996 | /* No error, don't finish the thread states yet. */ |
3997 | finish_state.release (); | |
731f534f | 3998 | |
d238133d TT |
3999 | /* This scope is used to ensure that readline callbacks are |
4000 | reinstalled here. */ | |
4001 | } | |
4f8d22e3 | 4002 | |
3b12939d PA |
4003 | /* If a UI was in sync execution mode, and now isn't, restore its |
4004 | prompt (a synchronous execution command has finished, and we're | |
4005 | ready for input). */ | |
4006 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4007 | |
4008 | if (cmd_done | |
0f641c01 | 4009 | && exec_done_display_p |
00431a78 PA |
4010 | && (inferior_ptid == null_ptid |
4011 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 4012 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
4013 | } |
4014 | ||
29734269 SM |
4015 | /* See infrun.h. */ |
4016 | ||
edb3359d | 4017 | void |
29734269 SM |
4018 | set_step_info (thread_info *tp, struct frame_info *frame, |
4019 | struct symtab_and_line sal) | |
edb3359d | 4020 | { |
29734269 SM |
4021 | /* This can be removed once this function no longer implicitly relies on the |
4022 | inferior_ptid value. */ | |
4023 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4024 | |
16c381f0 JK |
4025 | tp->control.step_frame_id = get_frame_id (frame); |
4026 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4027 | |
4028 | tp->current_symtab = sal.symtab; | |
4029 | tp->current_line = sal.line; | |
4030 | } | |
4031 | ||
0d1e5fa7 PA |
4032 | /* Clear context switchable stepping state. */ |
4033 | ||
4034 | void | |
4e1c45ea | 4035 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4036 | { |
7f5ef605 | 4037 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4038 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4039 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4040 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4041 | } |
4042 | ||
ab1ddbcf | 4043 | /* See infrun.h. */ |
c32c64b7 | 4044 | |
6efcd9a8 | 4045 | void |
5b6d1e4f PA |
4046 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
4047 | target_waitstatus status) | |
c32c64b7 | 4048 | { |
5b6d1e4f | 4049 | target_last_proc_target = target; |
c32c64b7 DE |
4050 | target_last_wait_ptid = ptid; |
4051 | target_last_waitstatus = status; | |
4052 | } | |
4053 | ||
ab1ddbcf | 4054 | /* See infrun.h. */ |
e02bc4cc DS |
4055 | |
4056 | void | |
5b6d1e4f PA |
4057 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4058 | target_waitstatus *status) | |
e02bc4cc | 4059 | { |
5b6d1e4f PA |
4060 | if (target != nullptr) |
4061 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4062 | if (ptid != nullptr) |
4063 | *ptid = target_last_wait_ptid; | |
4064 | if (status != nullptr) | |
4065 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4066 | } |
4067 | ||
ab1ddbcf PA |
4068 | /* See infrun.h. */ |
4069 | ||
ac264b3b MS |
4070 | void |
4071 | nullify_last_target_wait_ptid (void) | |
4072 | { | |
5b6d1e4f | 4073 | target_last_proc_target = nullptr; |
ac264b3b | 4074 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4075 | target_last_waitstatus = {}; |
ac264b3b MS |
4076 | } |
4077 | ||
dcf4fbde | 4078 | /* Switch thread contexts. */ |
dd80620e MS |
4079 | |
4080 | static void | |
00431a78 | 4081 | context_switch (execution_control_state *ecs) |
dd80620e | 4082 | { |
1eb8556f | 4083 | if (ecs->ptid != inferior_ptid |
5b6d1e4f PA |
4084 | && (inferior_ptid == null_ptid |
4085 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 | 4086 | { |
1eb8556f SM |
4087 | infrun_debug_printf ("Switching context from %s to %s", |
4088 | target_pid_to_str (inferior_ptid).c_str (), | |
4089 | target_pid_to_str (ecs->ptid).c_str ()); | |
fd48f117 DJ |
4090 | } |
4091 | ||
00431a78 | 4092 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4093 | } |
4094 | ||
d8dd4d5f PA |
4095 | /* If the target can't tell whether we've hit breakpoints |
4096 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4097 | check whether that could have been caused by a breakpoint. If so, | |
4098 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4099 | ||
4fa8626c | 4100 | static void |
d8dd4d5f PA |
4101 | adjust_pc_after_break (struct thread_info *thread, |
4102 | struct target_waitstatus *ws) | |
4fa8626c | 4103 | { |
24a73cce UW |
4104 | struct regcache *regcache; |
4105 | struct gdbarch *gdbarch; | |
118e6252 | 4106 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4107 | |
4fa8626c DJ |
4108 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4109 | we aren't, just return. | |
9709f61c DJ |
4110 | |
4111 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4112 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4113 | implemented by software breakpoints should be handled through the normal | |
4114 | breakpoint layer. | |
8fb3e588 | 4115 | |
4fa8626c DJ |
4116 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4117 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4118 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4119 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4120 | generates these signals at breakpoints (the code has been in GDB since at | |
4121 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4122 | |
e6cf7916 UW |
4123 | In earlier versions of GDB, a target with |
4124 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4125 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4126 | target with both of these set in GDB history, and it seems unlikely to be | |
4127 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4128 | |
d8dd4d5f | 4129 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4130 | return; |
4131 | ||
d8dd4d5f | 4132 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4133 | return; |
4134 | ||
4058b839 PA |
4135 | /* In reverse execution, when a breakpoint is hit, the instruction |
4136 | under it has already been de-executed. The reported PC always | |
4137 | points at the breakpoint address, so adjusting it further would | |
4138 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4139 | architecture: | |
4140 | ||
4141 | B1 0x08000000 : INSN1 | |
4142 | B2 0x08000001 : INSN2 | |
4143 | 0x08000002 : INSN3 | |
4144 | PC -> 0x08000003 : INSN4 | |
4145 | ||
4146 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4147 | from that point should hit B2 as below. Reading the PC when the | |
4148 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4149 | been de-executed already. | |
4150 | ||
4151 | B1 0x08000000 : INSN1 | |
4152 | B2 PC -> 0x08000001 : INSN2 | |
4153 | 0x08000002 : INSN3 | |
4154 | 0x08000003 : INSN4 | |
4155 | ||
4156 | We can't apply the same logic as for forward execution, because | |
4157 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4158 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4159 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4160 | behaviour. */ | |
4161 | if (execution_direction == EXEC_REVERSE) | |
4162 | return; | |
4163 | ||
1cf4d951 PA |
4164 | /* If the target can tell whether the thread hit a SW breakpoint, |
4165 | trust it. Targets that can tell also adjust the PC | |
4166 | themselves. */ | |
4167 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4168 | return; | |
4169 | ||
4170 | /* Note that relying on whether a breakpoint is planted in memory to | |
4171 | determine this can fail. E.g,. the breakpoint could have been | |
4172 | removed since. Or the thread could have been told to step an | |
4173 | instruction the size of a breakpoint instruction, and only | |
4174 | _after_ was a breakpoint inserted at its address. */ | |
4175 | ||
24a73cce UW |
4176 | /* If this target does not decrement the PC after breakpoints, then |
4177 | we have nothing to do. */ | |
00431a78 | 4178 | regcache = get_thread_regcache (thread); |
ac7936df | 4179 | gdbarch = regcache->arch (); |
118e6252 | 4180 | |
527a273a | 4181 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4182 | if (decr_pc == 0) |
24a73cce UW |
4183 | return; |
4184 | ||
8b86c959 | 4185 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4186 | |
8aad930b AC |
4187 | /* Find the location where (if we've hit a breakpoint) the |
4188 | breakpoint would be. */ | |
118e6252 | 4189 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4190 | |
1cf4d951 PA |
4191 | /* If the target can't tell whether a software breakpoint triggered, |
4192 | fallback to figuring it out based on breakpoints we think were | |
4193 | inserted in the target, and on whether the thread was stepped or | |
4194 | continued. */ | |
4195 | ||
1c5cfe86 PA |
4196 | /* Check whether there actually is a software breakpoint inserted at |
4197 | that location. | |
4198 | ||
4199 | If in non-stop mode, a race condition is possible where we've | |
4200 | removed a breakpoint, but stop events for that breakpoint were | |
4201 | already queued and arrive later. To suppress those spurious | |
4202 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4203 | and retire them after a number of stop events are reported. Note |
4204 | this is an heuristic and can thus get confused. The real fix is | |
4205 | to get the "stopped by SW BP and needs adjustment" info out of | |
4206 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4207 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4208 | || (target_is_non_stop_p () |
4209 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4210 | { |
07036511 | 4211 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4212 | |
8213266a | 4213 | if (record_full_is_used ()) |
07036511 TT |
4214 | restore_operation_disable.emplace |
4215 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4216 | |
1c0fdd0e UW |
4217 | /* When using hardware single-step, a SIGTRAP is reported for both |
4218 | a completed single-step and a software breakpoint. Need to | |
4219 | differentiate between the two, as the latter needs adjusting | |
4220 | but the former does not. | |
4221 | ||
4222 | The SIGTRAP can be due to a completed hardware single-step only if | |
4223 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4224 | - this thread is currently being stepped |
4225 | ||
4226 | If any of these events did not occur, we must have stopped due | |
4227 | to hitting a software breakpoint, and have to back up to the | |
4228 | breakpoint address. | |
4229 | ||
4230 | As a special case, we could have hardware single-stepped a | |
4231 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4232 | we also need to back up to the breakpoint address. */ | |
4233 | ||
d8dd4d5f PA |
4234 | if (thread_has_single_step_breakpoints_set (thread) |
4235 | || !currently_stepping (thread) | |
4236 | || (thread->stepped_breakpoint | |
4237 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4238 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4239 | } |
4fa8626c DJ |
4240 | } |
4241 | ||
c4464ade | 4242 | static bool |
edb3359d DJ |
4243 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) |
4244 | { | |
4245 | for (frame = get_prev_frame (frame); | |
4246 | frame != NULL; | |
4247 | frame = get_prev_frame (frame)) | |
4248 | { | |
4249 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
c4464ade SM |
4250 | return true; |
4251 | ||
edb3359d DJ |
4252 | if (get_frame_type (frame) != INLINE_FRAME) |
4253 | break; | |
4254 | } | |
4255 | ||
c4464ade | 4256 | return false; |
edb3359d DJ |
4257 | } |
4258 | ||
4a4c04f1 BE |
4259 | /* Look for an inline frame that is marked for skip. |
4260 | If PREV_FRAME is TRUE start at the previous frame, | |
4261 | otherwise start at the current frame. Stop at the | |
4262 | first non-inline frame, or at the frame where the | |
4263 | step started. */ | |
4264 | ||
4265 | static bool | |
4266 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4267 | { | |
4268 | struct frame_info *frame = get_current_frame (); | |
4269 | ||
4270 | if (prev_frame) | |
4271 | frame = get_prev_frame (frame); | |
4272 | ||
4273 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4274 | { | |
4275 | const char *fn = NULL; | |
4276 | symtab_and_line sal; | |
4277 | struct symbol *sym; | |
4278 | ||
4279 | if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id)) | |
4280 | break; | |
4281 | if (get_frame_type (frame) != INLINE_FRAME) | |
4282 | break; | |
4283 | ||
4284 | sal = find_frame_sal (frame); | |
4285 | sym = get_frame_function (frame); | |
4286 | ||
4287 | if (sym != NULL) | |
4288 | fn = sym->print_name (); | |
4289 | ||
4290 | if (sal.line != 0 | |
4291 | && function_name_is_marked_for_skip (fn, sal)) | |
4292 | return true; | |
4293 | } | |
4294 | ||
4295 | return false; | |
4296 | } | |
4297 | ||
c65d6b55 PA |
4298 | /* If the event thread has the stop requested flag set, pretend it |
4299 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4300 | target_stop). */ | |
4301 | ||
4302 | static bool | |
4303 | handle_stop_requested (struct execution_control_state *ecs) | |
4304 | { | |
4305 | if (ecs->event_thread->stop_requested) | |
4306 | { | |
4307 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4308 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4309 | handle_signal_stop (ecs); | |
4310 | return true; | |
4311 | } | |
4312 | return false; | |
4313 | } | |
4314 | ||
a96d9b2e | 4315 | /* Auxiliary function that handles syscall entry/return events. |
c4464ade SM |
4316 | It returns true if the inferior should keep going (and GDB |
4317 | should ignore the event), or false if the event deserves to be | |
a96d9b2e | 4318 | processed. */ |
ca2163eb | 4319 | |
c4464ade | 4320 | static bool |
ca2163eb | 4321 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4322 | { |
ca2163eb | 4323 | struct regcache *regcache; |
ca2163eb PA |
4324 | int syscall_number; |
4325 | ||
00431a78 | 4326 | context_switch (ecs); |
ca2163eb | 4327 | |
00431a78 | 4328 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4329 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4330 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4331 | |
a96d9b2e SDJ |
4332 | if (catch_syscall_enabled () > 0 |
4333 | && catching_syscall_number (syscall_number) > 0) | |
4334 | { | |
1eb8556f | 4335 | infrun_debug_printf ("syscall number=%d", syscall_number); |
a96d9b2e | 4336 | |
16c381f0 | 4337 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4338 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4339 | ecs->event_thread->suspend.stop_pc, |
4340 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4341 | |
c65d6b55 | 4342 | if (handle_stop_requested (ecs)) |
c4464ade | 4343 | return false; |
c65d6b55 | 4344 | |
ce12b012 | 4345 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4346 | { |
4347 | /* Catchpoint hit. */ | |
c4464ade | 4348 | return false; |
ca2163eb | 4349 | } |
a96d9b2e | 4350 | } |
ca2163eb | 4351 | |
c65d6b55 | 4352 | if (handle_stop_requested (ecs)) |
c4464ade | 4353 | return false; |
c65d6b55 | 4354 | |
ca2163eb | 4355 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb | 4356 | keep_going (ecs); |
c4464ade SM |
4357 | |
4358 | return true; | |
a96d9b2e SDJ |
4359 | } |
4360 | ||
7e324e48 GB |
4361 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4362 | ||
4363 | static void | |
4364 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4365 | struct execution_control_state *ecs) | |
4366 | { | |
4367 | if (!ecs->stop_func_filled_in) | |
4368 | { | |
98a617f8 | 4369 | const block *block; |
fe830662 | 4370 | const general_symbol_info *gsi; |
98a617f8 | 4371 | |
7e324e48 GB |
4372 | /* Don't care about return value; stop_func_start and stop_func_name |
4373 | will both be 0 if it doesn't work. */ | |
fe830662 TT |
4374 | find_pc_partial_function_sym (ecs->event_thread->suspend.stop_pc, |
4375 | &gsi, | |
4376 | &ecs->stop_func_start, | |
4377 | &ecs->stop_func_end, | |
4378 | &block); | |
4379 | ecs->stop_func_name = gsi == nullptr ? nullptr : gsi->print_name (); | |
98a617f8 KB |
4380 | |
4381 | /* The call to find_pc_partial_function, above, will set | |
4382 | stop_func_start and stop_func_end to the start and end | |
4383 | of the range containing the stop pc. If this range | |
4384 | contains the entry pc for the block (which is always the | |
4385 | case for contiguous blocks), advance stop_func_start past | |
4386 | the function's start offset and entrypoint. Note that | |
4387 | stop_func_start is NOT advanced when in a range of a | |
4388 | non-contiguous block that does not contain the entry pc. */ | |
4389 | if (block != nullptr | |
4390 | && ecs->stop_func_start <= BLOCK_ENTRY_PC (block) | |
4391 | && BLOCK_ENTRY_PC (block) < ecs->stop_func_end) | |
4392 | { | |
4393 | ecs->stop_func_start | |
4394 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4395 | ||
4396 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4397 | ecs->stop_func_start | |
4398 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4399 | } | |
591a12a1 | 4400 | |
7e324e48 GB |
4401 | ecs->stop_func_filled_in = 1; |
4402 | } | |
4403 | } | |
4404 | ||
4f5d7f63 | 4405 | |
00431a78 | 4406 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4407 | |
4408 | static enum stop_kind | |
00431a78 | 4409 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4410 | { |
5b6d1e4f | 4411 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4412 | |
4413 | gdb_assert (inf != NULL); | |
4414 | return inf->control.stop_soon; | |
4415 | } | |
4416 | ||
5b6d1e4f PA |
4417 | /* Poll for one event out of the current target. Store the resulting |
4418 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4419 | |
4420 | static ptid_t | |
5b6d1e4f | 4421 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4422 | { |
4423 | ptid_t event_ptid; | |
372316f1 PA |
4424 | |
4425 | overlay_cache_invalid = 1; | |
4426 | ||
4427 | /* Flush target cache before starting to handle each event. | |
4428 | Target was running and cache could be stale. This is just a | |
4429 | heuristic. Running threads may modify target memory, but we | |
4430 | don't get any event. */ | |
4431 | target_dcache_invalidate (); | |
4432 | ||
4433 | if (deprecated_target_wait_hook) | |
5b6d1e4f | 4434 | event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 | 4435 | else |
5b6d1e4f | 4436 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4437 | |
4438 | if (debug_infrun) | |
5b6d1e4f | 4439 | print_target_wait_results (minus_one_ptid, event_ptid, ws); |
372316f1 PA |
4440 | |
4441 | return event_ptid; | |
4442 | } | |
4443 | ||
5b6d1e4f PA |
4444 | /* An event reported by wait_one. */ |
4445 | ||
4446 | struct wait_one_event | |
4447 | { | |
4448 | /* The target the event came out of. */ | |
4449 | process_stratum_target *target; | |
4450 | ||
4451 | /* The PTID the event was for. */ | |
4452 | ptid_t ptid; | |
4453 | ||
4454 | /* The waitstatus. */ | |
4455 | target_waitstatus ws; | |
4456 | }; | |
4457 | ||
4458 | /* Wait for one event out of any target. */ | |
4459 | ||
4460 | static wait_one_event | |
4461 | wait_one () | |
4462 | { | |
4463 | while (1) | |
4464 | { | |
4465 | for (inferior *inf : all_inferiors ()) | |
4466 | { | |
4467 | process_stratum_target *target = inf->process_target (); | |
4468 | if (target == NULL | |
4469 | || !target->is_async_p () | |
4470 | || !target->threads_executing) | |
4471 | continue; | |
4472 | ||
4473 | switch_to_inferior_no_thread (inf); | |
4474 | ||
4475 | wait_one_event event; | |
4476 | event.target = target; | |
4477 | event.ptid = poll_one_curr_target (&event.ws); | |
4478 | ||
4479 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4480 | { | |
4481 | /* If nothing is resumed, remove the target from the | |
4482 | event loop. */ | |
4483 | target_async (0); | |
4484 | } | |
4485 | else if (event.ws.kind != TARGET_WAITKIND_IGNORE) | |
4486 | return event; | |
4487 | } | |
4488 | ||
4489 | /* Block waiting for some event. */ | |
4490 | ||
4491 | fd_set readfds; | |
4492 | int nfds = 0; | |
4493 | ||
4494 | FD_ZERO (&readfds); | |
4495 | ||
4496 | for (inferior *inf : all_inferiors ()) | |
4497 | { | |
4498 | process_stratum_target *target = inf->process_target (); | |
4499 | if (target == NULL | |
4500 | || !target->is_async_p () | |
4501 | || !target->threads_executing) | |
4502 | continue; | |
4503 | ||
4504 | int fd = target->async_wait_fd (); | |
4505 | FD_SET (fd, &readfds); | |
4506 | if (nfds <= fd) | |
4507 | nfds = fd + 1; | |
4508 | } | |
4509 | ||
4510 | if (nfds == 0) | |
4511 | { | |
4512 | /* No waitable targets left. All must be stopped. */ | |
4513 | return {NULL, minus_one_ptid, {TARGET_WAITKIND_NO_RESUMED}}; | |
4514 | } | |
4515 | ||
4516 | QUIT; | |
4517 | ||
4518 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4519 | if (numfds < 0) | |
4520 | { | |
4521 | if (errno == EINTR) | |
4522 | continue; | |
4523 | else | |
4524 | perror_with_name ("interruptible_select"); | |
4525 | } | |
4526 | } | |
4527 | } | |
4528 | ||
372316f1 PA |
4529 | /* Save the thread's event and stop reason to process it later. */ |
4530 | ||
4531 | static void | |
5b6d1e4f | 4532 | save_waitstatus (struct thread_info *tp, const target_waitstatus *ws) |
372316f1 | 4533 | { |
1eb8556f SM |
4534 | infrun_debug_printf ("saving status %s for %d.%ld.%ld", |
4535 | target_waitstatus_to_string (ws).c_str (), | |
4536 | tp->ptid.pid (), | |
4537 | tp->ptid.lwp (), | |
4538 | tp->ptid.tid ()); | |
372316f1 PA |
4539 | |
4540 | /* Record for later. */ | |
4541 | tp->suspend.waitstatus = *ws; | |
4542 | tp->suspend.waitstatus_pending_p = 1; | |
4543 | ||
00431a78 | 4544 | struct regcache *regcache = get_thread_regcache (tp); |
8b86c959 | 4545 | const address_space *aspace = regcache->aspace (); |
372316f1 PA |
4546 | |
4547 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4548 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4549 | { | |
4550 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4551 | ||
4552 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4553 | ||
18493a00 PA |
4554 | scoped_restore_current_thread restore_thread; |
4555 | switch_to_thread (tp); | |
4556 | ||
4557 | if (target_stopped_by_watchpoint ()) | |
372316f1 PA |
4558 | { |
4559 | tp->suspend.stop_reason | |
4560 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4561 | } | |
4562 | else if (target_supports_stopped_by_sw_breakpoint () | |
18493a00 | 4563 | && target_stopped_by_sw_breakpoint ()) |
372316f1 PA |
4564 | { |
4565 | tp->suspend.stop_reason | |
4566 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4567 | } | |
4568 | else if (target_supports_stopped_by_hw_breakpoint () | |
18493a00 | 4569 | && target_stopped_by_hw_breakpoint ()) |
372316f1 PA |
4570 | { |
4571 | tp->suspend.stop_reason | |
4572 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4573 | } | |
4574 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4575 | && hardware_breakpoint_inserted_here_p (aspace, | |
4576 | pc)) | |
4577 | { | |
4578 | tp->suspend.stop_reason | |
4579 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4580 | } | |
4581 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4582 | && software_breakpoint_inserted_here_p (aspace, | |
4583 | pc)) | |
4584 | { | |
4585 | tp->suspend.stop_reason | |
4586 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4587 | } | |
4588 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4589 | && currently_stepping (tp)) | |
4590 | { | |
4591 | tp->suspend.stop_reason | |
4592 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4593 | } | |
4594 | } | |
4595 | } | |
4596 | ||
293b3ebc TBA |
4597 | /* Mark the non-executing threads accordingly. In all-stop, all |
4598 | threads of all processes are stopped when we get any event | |
4599 | reported. In non-stop mode, only the event thread stops. */ | |
4600 | ||
4601 | static void | |
4602 | mark_non_executing_threads (process_stratum_target *target, | |
4603 | ptid_t event_ptid, | |
4604 | struct target_waitstatus ws) | |
4605 | { | |
4606 | ptid_t mark_ptid; | |
4607 | ||
4608 | if (!target_is_non_stop_p ()) | |
4609 | mark_ptid = minus_one_ptid; | |
4610 | else if (ws.kind == TARGET_WAITKIND_SIGNALLED | |
4611 | || ws.kind == TARGET_WAITKIND_EXITED) | |
4612 | { | |
4613 | /* If we're handling a process exit in non-stop mode, even | |
4614 | though threads haven't been deleted yet, one would think | |
4615 | that there is nothing to do, as threads of the dead process | |
4616 | will be soon deleted, and threads of any other process were | |
4617 | left running. However, on some targets, threads survive a | |
4618 | process exit event. E.g., for the "checkpoint" command, | |
4619 | when the current checkpoint/fork exits, linux-fork.c | |
4620 | automatically switches to another fork from within | |
4621 | target_mourn_inferior, by associating the same | |
4622 | inferior/thread to another fork. We haven't mourned yet at | |
4623 | this point, but we must mark any threads left in the | |
4624 | process as not-executing so that finish_thread_state marks | |
4625 | them stopped (in the user's perspective) if/when we present | |
4626 | the stop to the user. */ | |
4627 | mark_ptid = ptid_t (event_ptid.pid ()); | |
4628 | } | |
4629 | else | |
4630 | mark_ptid = event_ptid; | |
4631 | ||
4632 | set_executing (target, mark_ptid, false); | |
4633 | ||
4634 | /* Likewise the resumed flag. */ | |
4635 | set_resumed (target, mark_ptid, false); | |
4636 | } | |
4637 | ||
6efcd9a8 | 4638 | /* See infrun.h. */ |
372316f1 | 4639 | |
6efcd9a8 | 4640 | void |
372316f1 PA |
4641 | stop_all_threads (void) |
4642 | { | |
4643 | /* We may need multiple passes to discover all threads. */ | |
4644 | int pass; | |
4645 | int iterations = 0; | |
372316f1 | 4646 | |
53cccef1 | 4647 | gdb_assert (exists_non_stop_target ()); |
372316f1 | 4648 | |
1eb8556f | 4649 | infrun_debug_printf ("starting"); |
372316f1 | 4650 | |
00431a78 | 4651 | scoped_restore_current_thread restore_thread; |
372316f1 | 4652 | |
6ad82919 TBA |
4653 | /* Enable thread events of all targets. */ |
4654 | for (auto *target : all_non_exited_process_targets ()) | |
4655 | { | |
4656 | switch_to_target_no_thread (target); | |
4657 | target_thread_events (true); | |
4658 | } | |
4659 | ||
4660 | SCOPE_EXIT | |
4661 | { | |
4662 | /* Disable thread events of all targets. */ | |
4663 | for (auto *target : all_non_exited_process_targets ()) | |
4664 | { | |
4665 | switch_to_target_no_thread (target); | |
4666 | target_thread_events (false); | |
4667 | } | |
4668 | ||
1eb8556f SM |
4669 | /* Use infrun_debug_printf_1 directly to get a meaningful function |
4670 | name. */ | |
6ad82919 | 4671 | if (debug_infrun) |
1eb8556f | 4672 | infrun_debug_printf_1 ("stop_all_threads", "done"); |
6ad82919 | 4673 | }; |
65706a29 | 4674 | |
372316f1 PA |
4675 | /* Request threads to stop, and then wait for the stops. Because |
4676 | threads we already know about can spawn more threads while we're | |
4677 | trying to stop them, and we only learn about new threads when we | |
4678 | update the thread list, do this in a loop, and keep iterating | |
4679 | until two passes find no threads that need to be stopped. */ | |
4680 | for (pass = 0; pass < 2; pass++, iterations++) | |
4681 | { | |
1eb8556f | 4682 | infrun_debug_printf ("pass=%d, iterations=%d", pass, iterations); |
372316f1 PA |
4683 | while (1) |
4684 | { | |
29d6859f | 4685 | int waits_needed = 0; |
372316f1 | 4686 | |
a05575d3 TBA |
4687 | for (auto *target : all_non_exited_process_targets ()) |
4688 | { | |
4689 | switch_to_target_no_thread (target); | |
4690 | update_thread_list (); | |
4691 | } | |
372316f1 PA |
4692 | |
4693 | /* Go through all threads looking for threads that we need | |
4694 | to tell the target to stop. */ | |
08036331 | 4695 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 4696 | { |
53cccef1 TBA |
4697 | /* For a single-target setting with an all-stop target, |
4698 | we would not even arrive here. For a multi-target | |
4699 | setting, until GDB is able to handle a mixture of | |
4700 | all-stop and non-stop targets, simply skip all-stop | |
4701 | targets' threads. This should be fine due to the | |
4702 | protection of 'check_multi_target_resumption'. */ | |
4703 | ||
4704 | switch_to_thread_no_regs (t); | |
4705 | if (!target_is_non_stop_p ()) | |
4706 | continue; | |
4707 | ||
372316f1 PA |
4708 | if (t->executing) |
4709 | { | |
4710 | /* If already stopping, don't request a stop again. | |
4711 | We just haven't seen the notification yet. */ | |
4712 | if (!t->stop_requested) | |
4713 | { | |
1eb8556f SM |
4714 | infrun_debug_printf (" %s executing, need stop", |
4715 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4716 | target_stop (t->ptid); |
4717 | t->stop_requested = 1; | |
4718 | } | |
4719 | else | |
4720 | { | |
1eb8556f SM |
4721 | infrun_debug_printf (" %s executing, already stopping", |
4722 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4723 | } |
4724 | ||
4725 | if (t->stop_requested) | |
29d6859f | 4726 | waits_needed++; |
372316f1 PA |
4727 | } |
4728 | else | |
4729 | { | |
1eb8556f SM |
4730 | infrun_debug_printf (" %s not executing", |
4731 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4732 | |
4733 | /* The thread may be not executing, but still be | |
4734 | resumed with a pending status to process. */ | |
719546c4 | 4735 | t->resumed = false; |
372316f1 PA |
4736 | } |
4737 | } | |
4738 | ||
29d6859f | 4739 | if (waits_needed == 0) |
372316f1 PA |
4740 | break; |
4741 | ||
4742 | /* If we find new threads on the second iteration, restart | |
4743 | over. We want to see two iterations in a row with all | |
4744 | threads stopped. */ | |
4745 | if (pass > 0) | |
4746 | pass = -1; | |
4747 | ||
29d6859f | 4748 | for (int i = 0; i < waits_needed; i++) |
c29705b7 | 4749 | { |
29d6859f | 4750 | wait_one_event event = wait_one (); |
a05575d3 | 4751 | |
1eb8556f SM |
4752 | infrun_debug_printf |
4753 | ("%s %s", target_waitstatus_to_string (&event.ws).c_str (), | |
4754 | target_pid_to_str (event.ptid).c_str ()); | |
a05575d3 | 4755 | |
29d6859f | 4756 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) |
a05575d3 | 4757 | { |
29d6859f LM |
4758 | /* All resumed threads exited. */ |
4759 | break; | |
a05575d3 | 4760 | } |
29d6859f LM |
4761 | else if (event.ws.kind == TARGET_WAITKIND_THREAD_EXITED |
4762 | || event.ws.kind == TARGET_WAITKIND_EXITED | |
4763 | || event.ws.kind == TARGET_WAITKIND_SIGNALLED) | |
6efcd9a8 | 4764 | { |
29d6859f | 4765 | /* One thread/process exited/signalled. */ |
6efcd9a8 | 4766 | |
29d6859f | 4767 | thread_info *t = nullptr; |
372316f1 | 4768 | |
29d6859f LM |
4769 | /* The target may have reported just a pid. If so, try |
4770 | the first non-exited thread. */ | |
4771 | if (event.ptid.is_pid ()) | |
372316f1 | 4772 | { |
29d6859f LM |
4773 | int pid = event.ptid.pid (); |
4774 | inferior *inf = find_inferior_pid (event.target, pid); | |
4775 | for (thread_info *tp : inf->non_exited_threads ()) | |
372316f1 | 4776 | { |
29d6859f LM |
4777 | t = tp; |
4778 | break; | |
372316f1 | 4779 | } |
29d6859f LM |
4780 | |
4781 | /* If there is no available thread, the event would | |
4782 | have to be appended to a per-inferior event list, | |
4783 | which does not exist (and if it did, we'd have | |
4784 | to adjust run control command to be able to | |
4785 | resume such an inferior). We assert here instead | |
4786 | of going into an infinite loop. */ | |
4787 | gdb_assert (t != nullptr); | |
4788 | ||
1eb8556f SM |
4789 | infrun_debug_printf |
4790 | ("using %s", target_pid_to_str (t->ptid).c_str ()); | |
29d6859f LM |
4791 | } |
4792 | else | |
4793 | { | |
4794 | t = find_thread_ptid (event.target, event.ptid); | |
4795 | /* Check if this is the first time we see this thread. | |
4796 | Don't bother adding if it individually exited. */ | |
4797 | if (t == nullptr | |
4798 | && event.ws.kind != TARGET_WAITKIND_THREAD_EXITED) | |
4799 | t = add_thread (event.target, event.ptid); | |
4800 | } | |
4801 | ||
4802 | if (t != nullptr) | |
4803 | { | |
4804 | /* Set the threads as non-executing to avoid | |
4805 | another stop attempt on them. */ | |
4806 | switch_to_thread_no_regs (t); | |
4807 | mark_non_executing_threads (event.target, event.ptid, | |
4808 | event.ws); | |
4809 | save_waitstatus (t, &event.ws); | |
4810 | t->stop_requested = false; | |
372316f1 PA |
4811 | } |
4812 | } | |
4813 | else | |
4814 | { | |
29d6859f LM |
4815 | thread_info *t = find_thread_ptid (event.target, event.ptid); |
4816 | if (t == NULL) | |
4817 | t = add_thread (event.target, event.ptid); | |
372316f1 | 4818 | |
29d6859f LM |
4819 | t->stop_requested = 0; |
4820 | t->executing = 0; | |
4821 | t->resumed = false; | |
4822 | t->control.may_range_step = 0; | |
4823 | ||
4824 | /* This may be the first time we see the inferior report | |
4825 | a stop. */ | |
4826 | inferior *inf = find_inferior_ptid (event.target, event.ptid); | |
4827 | if (inf->needs_setup) | |
372316f1 | 4828 | { |
29d6859f LM |
4829 | switch_to_thread_no_regs (t); |
4830 | setup_inferior (0); | |
372316f1 PA |
4831 | } |
4832 | ||
29d6859f LM |
4833 | if (event.ws.kind == TARGET_WAITKIND_STOPPED |
4834 | && event.ws.value.sig == GDB_SIGNAL_0) | |
372316f1 | 4835 | { |
29d6859f LM |
4836 | /* We caught the event that we intended to catch, so |
4837 | there's no event pending. */ | |
4838 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4839 | t->suspend.waitstatus_pending_p = 0; | |
4840 | ||
4841 | if (displaced_step_fixup (t, GDB_SIGNAL_0) < 0) | |
4842 | { | |
4843 | /* Add it back to the step-over queue. */ | |
1eb8556f SM |
4844 | infrun_debug_printf |
4845 | ("displaced-step of %s canceled: adding back to " | |
4846 | "the step-over queue", | |
4847 | target_pid_to_str (t->ptid).c_str ()); | |
4848 | ||
29d6859f LM |
4849 | t->control.trap_expected = 0; |
4850 | thread_step_over_chain_enqueue (t); | |
4851 | } | |
372316f1 | 4852 | } |
29d6859f LM |
4853 | else |
4854 | { | |
4855 | enum gdb_signal sig; | |
4856 | struct regcache *regcache; | |
372316f1 | 4857 | |
1eb8556f SM |
4858 | infrun_debug_printf |
4859 | ("target_wait %s, saving status for %d.%ld.%ld", | |
4860 | target_waitstatus_to_string (&event.ws).c_str (), | |
4861 | t->ptid.pid (), t->ptid.lwp (), t->ptid.tid ()); | |
29d6859f LM |
4862 | |
4863 | /* Record for later. */ | |
4864 | save_waitstatus (t, &event.ws); | |
4865 | ||
4866 | sig = (event.ws.kind == TARGET_WAITKIND_STOPPED | |
4867 | ? event.ws.value.sig : GDB_SIGNAL_0); | |
4868 | ||
4869 | if (displaced_step_fixup (t, sig) < 0) | |
4870 | { | |
4871 | /* Add it back to the step-over queue. */ | |
4872 | t->control.trap_expected = 0; | |
4873 | thread_step_over_chain_enqueue (t); | |
4874 | } | |
4875 | ||
4876 | regcache = get_thread_regcache (t); | |
4877 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4878 | ||
1eb8556f SM |
4879 | infrun_debug_printf ("saved stop_pc=%s for %s " |
4880 | "(currently_stepping=%d)", | |
4881 | paddress (target_gdbarch (), | |
4882 | t->suspend.stop_pc), | |
4883 | target_pid_to_str (t->ptid).c_str (), | |
4884 | currently_stepping (t)); | |
372316f1 PA |
4885 | } |
4886 | } | |
4887 | } | |
4888 | } | |
4889 | } | |
372316f1 PA |
4890 | } |
4891 | ||
f4836ba9 PA |
4892 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4893 | ||
c4464ade | 4894 | static bool |
f4836ba9 PA |
4895 | handle_no_resumed (struct execution_control_state *ecs) |
4896 | { | |
3b12939d | 4897 | if (target_can_async_p ()) |
f4836ba9 | 4898 | { |
c4464ade | 4899 | bool any_sync = false; |
f4836ba9 | 4900 | |
2dab0c7b | 4901 | for (ui *ui : all_uis ()) |
3b12939d PA |
4902 | { |
4903 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4904 | { | |
c4464ade | 4905 | any_sync = true; |
3b12939d PA |
4906 | break; |
4907 | } | |
4908 | } | |
4909 | if (!any_sync) | |
4910 | { | |
4911 | /* There were no unwaited-for children left in the target, but, | |
4912 | we're not synchronously waiting for events either. Just | |
4913 | ignore. */ | |
4914 | ||
1eb8556f | 4915 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)"); |
3b12939d | 4916 | prepare_to_wait (ecs); |
c4464ade | 4917 | return true; |
3b12939d | 4918 | } |
f4836ba9 PA |
4919 | } |
4920 | ||
4921 | /* Otherwise, if we were running a synchronous execution command, we | |
4922 | may need to cancel it and give the user back the terminal. | |
4923 | ||
4924 | In non-stop mode, the target can't tell whether we've already | |
4925 | consumed previous stop events, so it can end up sending us a | |
4926 | no-resumed event like so: | |
4927 | ||
4928 | #0 - thread 1 is left stopped | |
4929 | ||
4930 | #1 - thread 2 is resumed and hits breakpoint | |
4931 | -> TARGET_WAITKIND_STOPPED | |
4932 | ||
4933 | #2 - thread 3 is resumed and exits | |
4934 | this is the last resumed thread, so | |
4935 | -> TARGET_WAITKIND_NO_RESUMED | |
4936 | ||
4937 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4938 | it. | |
4939 | ||
4940 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4941 | thread 2 is now resumed, so the event should be ignored. | |
4942 | ||
4943 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4944 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4945 | event. But it could be that the event meant that thread 2 itself | |
4946 | (or whatever other thread was the last resumed thread) exited. | |
4947 | ||
4948 | To address this we refresh the thread list and check whether we | |
4949 | have resumed threads _now_. In the example above, this removes | |
4950 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4951 | ignore this event. If we find no thread resumed, then we cancel | |
7d3badc6 PA |
4952 | the synchronous command and show "no unwaited-for " to the |
4953 | user. */ | |
f4836ba9 | 4954 | |
d6cc5d98 | 4955 | inferior *curr_inf = current_inferior (); |
7d3badc6 | 4956 | |
d6cc5d98 PA |
4957 | scoped_restore_current_thread restore_thread; |
4958 | ||
4959 | for (auto *target : all_non_exited_process_targets ()) | |
4960 | { | |
4961 | switch_to_target_no_thread (target); | |
4962 | update_thread_list (); | |
4963 | } | |
4964 | ||
4965 | /* If: | |
4966 | ||
4967 | - the current target has no thread executing, and | |
4968 | - the current inferior is native, and | |
4969 | - the current inferior is the one which has the terminal, and | |
4970 | - we did nothing, | |
4971 | ||
4972 | then a Ctrl-C from this point on would remain stuck in the | |
4973 | kernel, until a thread resumes and dequeues it. That would | |
4974 | result in the GDB CLI not reacting to Ctrl-C, not able to | |
4975 | interrupt the program. To address this, if the current inferior | |
4976 | no longer has any thread executing, we give the terminal to some | |
4977 | other inferior that has at least one thread executing. */ | |
4978 | bool swap_terminal = true; | |
4979 | ||
4980 | /* Whether to ignore this TARGET_WAITKIND_NO_RESUMED event, or | |
4981 | whether to report it to the user. */ | |
4982 | bool ignore_event = false; | |
7d3badc6 PA |
4983 | |
4984 | for (thread_info *thread : all_non_exited_threads ()) | |
f4836ba9 | 4985 | { |
d6cc5d98 PA |
4986 | if (swap_terminal && thread->executing) |
4987 | { | |
4988 | if (thread->inf != curr_inf) | |
4989 | { | |
4990 | target_terminal::ours (); | |
4991 | ||
4992 | switch_to_thread (thread); | |
4993 | target_terminal::inferior (); | |
4994 | } | |
4995 | swap_terminal = false; | |
4996 | } | |
4997 | ||
4998 | if (!ignore_event | |
4999 | && (thread->executing | |
5000 | || thread->suspend.waitstatus_pending_p)) | |
f4836ba9 | 5001 | { |
7d3badc6 PA |
5002 | /* Either there were no unwaited-for children left in the |
5003 | target at some point, but there are now, or some target | |
5004 | other than the eventing one has unwaited-for children | |
5005 | left. Just ignore. */ | |
1eb8556f SM |
5006 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED " |
5007 | "(ignoring: found resumed)"); | |
d6cc5d98 PA |
5008 | |
5009 | ignore_event = true; | |
f4836ba9 | 5010 | } |
d6cc5d98 PA |
5011 | |
5012 | if (ignore_event && !swap_terminal) | |
5013 | break; | |
5014 | } | |
5015 | ||
5016 | if (ignore_event) | |
5017 | { | |
5018 | switch_to_inferior_no_thread (curr_inf); | |
5019 | prepare_to_wait (ecs); | |
c4464ade | 5020 | return true; |
f4836ba9 PA |
5021 | } |
5022 | ||
5023 | /* Go ahead and report the event. */ | |
c4464ade | 5024 | return false; |
f4836ba9 PA |
5025 | } |
5026 | ||
05ba8510 PA |
5027 | /* Given an execution control state that has been freshly filled in by |
5028 | an event from the inferior, figure out what it means and take | |
5029 | appropriate action. | |
5030 | ||
5031 | The alternatives are: | |
5032 | ||
22bcd14b | 5033 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5034 | debugger. |
5035 | ||
5036 | 2) keep_going and return; to wait for the next event (set | |
5037 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5038 | once). */ | |
c906108c | 5039 | |
ec9499be | 5040 | static void |
595915c1 | 5041 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5042 | { |
595915c1 TT |
5043 | /* Make sure that all temporary struct value objects that were |
5044 | created during the handling of the event get deleted at the | |
5045 | end. */ | |
5046 | scoped_value_mark free_values; | |
5047 | ||
d6b48e9c PA |
5048 | enum stop_kind stop_soon; |
5049 | ||
1eb8556f | 5050 | infrun_debug_printf ("%s", target_waitstatus_to_string (&ecs->ws).c_str ()); |
c29705b7 | 5051 | |
28736962 PA |
5052 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
5053 | { | |
5054 | /* We had an event in the inferior, but we are not interested in | |
5055 | handling it at this level. The lower layers have already | |
5056 | done what needs to be done, if anything. | |
5057 | ||
5058 | One of the possible circumstances for this is when the | |
5059 | inferior produces output for the console. The inferior has | |
5060 | not stopped, and we are ignoring the event. Another possible | |
5061 | circumstance is any event which the lower level knows will be | |
5062 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5063 | prepare_to_wait (ecs); |
5064 | return; | |
5065 | } | |
5066 | ||
65706a29 PA |
5067 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
5068 | { | |
65706a29 PA |
5069 | prepare_to_wait (ecs); |
5070 | return; | |
5071 | } | |
5072 | ||
0e5bf2a8 | 5073 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5074 | && handle_no_resumed (ecs)) |
5075 | return; | |
0e5bf2a8 | 5076 | |
5b6d1e4f PA |
5077 | /* Cache the last target/ptid/waitstatus. */ |
5078 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5079 | |
ca005067 | 5080 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5081 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5082 | |
0e5bf2a8 PA |
5083 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
5084 | { | |
5085 | /* No unwaited-for children left. IOW, all resumed children | |
5086 | have exited. */ | |
c4464ade | 5087 | stop_print_frame = false; |
22bcd14b | 5088 | stop_waiting (ecs); |
0e5bf2a8 PA |
5089 | return; |
5090 | } | |
5091 | ||
8c90c137 | 5092 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 5093 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 | 5094 | { |
5b6d1e4f | 5095 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5096 | /* If it's a new thread, add it to the thread database. */ |
5097 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5098 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5099 | |
5100 | /* Disable range stepping. If the next step request could use a | |
5101 | range, this will be end up re-enabled then. */ | |
5102 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5103 | } |
88ed393a JK |
5104 | |
5105 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 5106 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
5107 | |
5108 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5109 | reinit_frame_cache (); | |
5110 | ||
28736962 PA |
5111 | breakpoint_retire_moribund (); |
5112 | ||
2b009048 DJ |
5113 | /* First, distinguish signals caused by the debugger from signals |
5114 | that have to do with the program's own actions. Note that | |
5115 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5116 | on the operating system version. Here we detect when a SIGILL or | |
5117 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5118 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5119 | when we're trying to execute a breakpoint instruction on a | |
5120 | non-executable stack. This happens for call dummy breakpoints | |
5121 | for architectures like SPARC that place call dummies on the | |
5122 | stack. */ | |
2b009048 | 5123 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
5124 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
5125 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
5126 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 5127 | { |
00431a78 | 5128 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5129 | |
a01bda52 | 5130 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5131 | regcache_read_pc (regcache))) |
5132 | { | |
1eb8556f | 5133 | infrun_debug_printf ("Treating signal as SIGTRAP"); |
a493e3e2 | 5134 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 5135 | } |
2b009048 DJ |
5136 | } |
5137 | ||
293b3ebc | 5138 | mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws); |
8c90c137 | 5139 | |
488f131b JB |
5140 | switch (ecs->ws.kind) |
5141 | { | |
5142 | case TARGET_WAITKIND_LOADED: | |
00431a78 | 5143 | context_switch (ecs); |
b0f4b84b DJ |
5144 | /* Ignore gracefully during startup of the inferior, as it might |
5145 | be the shell which has just loaded some objects, otherwise | |
5146 | add the symbols for the newly loaded objects. Also ignore at | |
5147 | the beginning of an attach or remote session; we will query | |
5148 | the full list of libraries once the connection is | |
5149 | established. */ | |
4f5d7f63 | 5150 | |
00431a78 | 5151 | stop_soon = get_inferior_stop_soon (ecs); |
c0236d92 | 5152 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 5153 | { |
edcc5120 TT |
5154 | struct regcache *regcache; |
5155 | ||
00431a78 | 5156 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 TT |
5157 | |
5158 | handle_solib_event (); | |
5159 | ||
5160 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 5161 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
5162 | ecs->event_thread->suspend.stop_pc, |
5163 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 5164 | |
c65d6b55 PA |
5165 | if (handle_stop_requested (ecs)) |
5166 | return; | |
5167 | ||
ce12b012 | 5168 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
5169 | { |
5170 | /* A catchpoint triggered. */ | |
94c57d6a PA |
5171 | process_event_stop_test (ecs); |
5172 | return; | |
edcc5120 | 5173 | } |
488f131b | 5174 | |
b0f4b84b DJ |
5175 | /* If requested, stop when the dynamic linker notifies |
5176 | gdb of events. This allows the user to get control | |
5177 | and place breakpoints in initializer routines for | |
5178 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 5179 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
5180 | if (stop_on_solib_events) |
5181 | { | |
55409f9d DJ |
5182 | /* Make sure we print "Stopped due to solib-event" in |
5183 | normal_stop. */ | |
c4464ade | 5184 | stop_print_frame = true; |
55409f9d | 5185 | |
22bcd14b | 5186 | stop_waiting (ecs); |
b0f4b84b DJ |
5187 | return; |
5188 | } | |
488f131b | 5189 | } |
b0f4b84b DJ |
5190 | |
5191 | /* If we are skipping through a shell, or through shared library | |
5192 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 5193 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
5194 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
5195 | { | |
74960c60 VP |
5196 | /* Loading of shared libraries might have changed breakpoint |
5197 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 5198 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 5199 | insert_breakpoints (); |
64ce06e4 | 5200 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
5201 | prepare_to_wait (ecs); |
5202 | return; | |
5203 | } | |
5204 | ||
5c09a2c5 PA |
5205 | /* But stop if we're attaching or setting up a remote |
5206 | connection. */ | |
5207 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5208 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5209 | { | |
1eb8556f | 5210 | infrun_debug_printf ("quietly stopped"); |
22bcd14b | 5211 | stop_waiting (ecs); |
5c09a2c5 PA |
5212 | return; |
5213 | } | |
5214 | ||
5215 | internal_error (__FILE__, __LINE__, | |
5216 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 5217 | |
488f131b | 5218 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5219 | if (handle_stop_requested (ecs)) |
5220 | return; | |
00431a78 | 5221 | context_switch (ecs); |
64ce06e4 | 5222 | resume (GDB_SIGNAL_0); |
488f131b JB |
5223 | prepare_to_wait (ecs); |
5224 | return; | |
c5aa993b | 5225 | |
65706a29 | 5226 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5227 | if (handle_stop_requested (ecs)) |
5228 | return; | |
00431a78 | 5229 | context_switch (ecs); |
65706a29 PA |
5230 | if (!switch_back_to_stepped_thread (ecs)) |
5231 | keep_going (ecs); | |
5232 | return; | |
5233 | ||
488f131b | 5234 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5235 | case TARGET_WAITKIND_SIGNALLED: |
18493a00 PA |
5236 | { |
5237 | /* Depending on the system, ecs->ptid may point to a thread or | |
5238 | to a process. On some targets, target_mourn_inferior may | |
5239 | need to have access to the just-exited thread. That is the | |
5240 | case of GNU/Linux's "checkpoint" support, for example. | |
5241 | Call the switch_to_xxx routine as appropriate. */ | |
5242 | thread_info *thr = find_thread_ptid (ecs->target, ecs->ptid); | |
5243 | if (thr != nullptr) | |
5244 | switch_to_thread (thr); | |
5245 | else | |
5246 | { | |
5247 | inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); | |
5248 | switch_to_inferior_no_thread (inf); | |
5249 | } | |
5250 | } | |
6c95b8df | 5251 | handle_vfork_child_exec_or_exit (0); |
223ffa71 | 5252 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5253 | |
0c557179 SDJ |
5254 | /* Clearing any previous state of convenience variables. */ |
5255 | clear_exit_convenience_vars (); | |
5256 | ||
940c3c06 PA |
5257 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5258 | { | |
5259 | /* Record the exit code in the convenience variable $_exitcode, so | |
5260 | that the user can inspect this again later. */ | |
5261 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5262 | (LONGEST) ecs->ws.value.integer); | |
5263 | ||
5264 | /* Also record this in the inferior itself. */ | |
5265 | current_inferior ()->has_exit_code = 1; | |
5266 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5267 | |
98eb56a4 PA |
5268 | /* Support the --return-child-result option. */ |
5269 | return_child_result_value = ecs->ws.value.integer; | |
5270 | ||
76727919 | 5271 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
5272 | } |
5273 | else | |
0c557179 | 5274 | { |
00431a78 | 5275 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5276 | |
5277 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5278 | { | |
5279 | /* Set the value of the internal variable $_exitsignal, | |
5280 | which holds the signal uncaught by the inferior. */ | |
5281 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5282 | gdbarch_gdb_signal_to_target (gdbarch, | |
5283 | ecs->ws.value.sig)); | |
5284 | } | |
5285 | else | |
5286 | { | |
5287 | /* We don't have access to the target's method used for | |
5288 | converting between signal numbers (GDB's internal | |
5289 | representation <-> target's representation). | |
5290 | Therefore, we cannot do a good job at displaying this | |
5291 | information to the user. It's better to just warn | |
5292 | her about it (if infrun debugging is enabled), and | |
5293 | give up. */ | |
1eb8556f SM |
5294 | infrun_debug_printf ("Cannot fill $_exitsignal with the correct " |
5295 | "signal number."); | |
0c557179 SDJ |
5296 | } |
5297 | ||
76727919 | 5298 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 5299 | } |
8cf64490 | 5300 | |
488f131b | 5301 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5302 | target_mourn_inferior (inferior_ptid); |
c4464ade | 5303 | stop_print_frame = false; |
22bcd14b | 5304 | stop_waiting (ecs); |
488f131b | 5305 | return; |
c5aa993b | 5306 | |
488f131b | 5307 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5308 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5309 | /* Check whether the inferior is displaced stepping. */ |
5310 | { | |
00431a78 | 5311 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5312 | struct gdbarch *gdbarch = regcache->arch (); |
e2d96639 YQ |
5313 | |
5314 | /* If checking displaced stepping is supported, and thread | |
5315 | ecs->ptid is displaced stepping. */ | |
00431a78 | 5316 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 YQ |
5317 | { |
5318 | struct inferior *parent_inf | |
5b6d1e4f | 5319 | = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 YQ |
5320 | struct regcache *child_regcache; |
5321 | CORE_ADDR parent_pc; | |
5322 | ||
d8d83535 SM |
5323 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) |
5324 | { | |
5325 | struct displaced_step_inferior_state *displaced | |
5326 | = get_displaced_stepping_state (parent_inf); | |
5327 | ||
5328 | /* Restore scratch pad for child process. */ | |
5329 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
5330 | } | |
5331 | ||
e2d96639 YQ |
5332 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, |
5333 | indicating that the displaced stepping of syscall instruction | |
5334 | has been done. Perform cleanup for parent process here. Note | |
5335 | that this operation also cleans up the child process for vfork, | |
5336 | because their pages are shared. */ | |
00431a78 | 5337 | displaced_step_fixup (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5338 | /* Start a new step-over in another thread if there's one |
5339 | that needs it. */ | |
5340 | start_step_over (); | |
e2d96639 | 5341 | |
e2d96639 YQ |
5342 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5343 | the child's PC is also within the scratchpad. Set the child's PC | |
5344 | to the parent's PC value, which has already been fixed up. | |
5345 | FIXME: we use the parent's aspace here, although we're touching | |
5346 | the child, because the child hasn't been added to the inferior | |
5347 | list yet at this point. */ | |
5348 | ||
5349 | child_regcache | |
5b6d1e4f PA |
5350 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
5351 | ecs->ws.value.related_pid, | |
e2d96639 YQ |
5352 | gdbarch, |
5353 | parent_inf->aspace); | |
5354 | /* Read PC value of parent process. */ | |
5355 | parent_pc = regcache_read_pc (regcache); | |
5356 | ||
5357 | if (debug_displaced) | |
5358 | fprintf_unfiltered (gdb_stdlog, | |
5359 | "displaced: write child pc from %s to %s\n", | |
5360 | paddress (gdbarch, | |
5361 | regcache_read_pc (child_regcache)), | |
5362 | paddress (gdbarch, parent_pc)); | |
5363 | ||
5364 | regcache_write_pc (child_regcache, parent_pc); | |
5365 | } | |
5366 | } | |
5367 | ||
00431a78 | 5368 | context_switch (ecs); |
5a2901d9 | 5369 | |
b242c3c2 PA |
5370 | /* Immediately detach breakpoints from the child before there's |
5371 | any chance of letting the user delete breakpoints from the | |
5372 | breakpoint lists. If we don't do this early, it's easy to | |
5373 | leave left over traps in the child, vis: "break foo; catch | |
5374 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5375 | the fork on the last `continue', and by that time the | |
5376 | breakpoint at "foo" is long gone from the breakpoint table. | |
5377 | If we vforked, then we don't need to unpatch here, since both | |
5378 | parent and child are sharing the same memory pages; we'll | |
5379 | need to unpatch at follow/detach time instead to be certain | |
5380 | that new breakpoints added between catchpoint hit time and | |
5381 | vfork follow are detached. */ | |
5382 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5383 | { | |
b242c3c2 PA |
5384 | /* This won't actually modify the breakpoint list, but will |
5385 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5386 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5387 | } |
5388 | ||
34b7e8a6 | 5389 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5390 | |
e58b0e63 PA |
5391 | /* In case the event is caught by a catchpoint, remember that |
5392 | the event is to be followed at the next resume of the thread, | |
5393 | and not immediately. */ | |
5394 | ecs->event_thread->pending_follow = ecs->ws; | |
5395 | ||
f2ffa92b PA |
5396 | ecs->event_thread->suspend.stop_pc |
5397 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 5398 | |
16c381f0 | 5399 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5400 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5401 | ecs->event_thread->suspend.stop_pc, |
5402 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 5403 | |
c65d6b55 PA |
5404 | if (handle_stop_requested (ecs)) |
5405 | return; | |
5406 | ||
ce12b012 PA |
5407 | /* If no catchpoint triggered for this, then keep going. Note |
5408 | that we're interested in knowing the bpstat actually causes a | |
5409 | stop, not just if it may explain the signal. Software | |
5410 | watchpoints, for example, always appear in the bpstat. */ | |
5411 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5412 | { |
5ab2fbf1 | 5413 | bool follow_child |
3e43a32a | 5414 | = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 5415 | |
a493e3e2 | 5416 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 | 5417 | |
5b6d1e4f PA |
5418 | process_stratum_target *targ |
5419 | = ecs->event_thread->inf->process_target (); | |
5420 | ||
5ab2fbf1 | 5421 | bool should_resume = follow_fork (); |
e58b0e63 | 5422 | |
5b6d1e4f PA |
5423 | /* Note that one of these may be an invalid pointer, |
5424 | depending on detach_fork. */ | |
00431a78 | 5425 | thread_info *parent = ecs->event_thread; |
5b6d1e4f PA |
5426 | thread_info *child |
5427 | = find_thread_ptid (targ, ecs->ws.value.related_pid); | |
6c95b8df | 5428 | |
a2077e25 PA |
5429 | /* At this point, the parent is marked running, and the |
5430 | child is marked stopped. */ | |
5431 | ||
5432 | /* If not resuming the parent, mark it stopped. */ | |
5433 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5434 | parent->set_running (false); |
a2077e25 PA |
5435 | |
5436 | /* If resuming the child, mark it running. */ | |
5437 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5438 | child->set_running (true); |
a2077e25 | 5439 | |
6c95b8df | 5440 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5441 | if (!detach_fork && (non_stop |
5442 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5443 | { |
5444 | if (follow_child) | |
5445 | switch_to_thread (parent); | |
5446 | else | |
5447 | switch_to_thread (child); | |
5448 | ||
5449 | ecs->event_thread = inferior_thread (); | |
5450 | ecs->ptid = inferior_ptid; | |
5451 | keep_going (ecs); | |
5452 | } | |
5453 | ||
5454 | if (follow_child) | |
5455 | switch_to_thread (child); | |
5456 | else | |
5457 | switch_to_thread (parent); | |
5458 | ||
e58b0e63 PA |
5459 | ecs->event_thread = inferior_thread (); |
5460 | ecs->ptid = inferior_ptid; | |
5461 | ||
5462 | if (should_resume) | |
5463 | keep_going (ecs); | |
5464 | else | |
22bcd14b | 5465 | stop_waiting (ecs); |
04e68871 DJ |
5466 | return; |
5467 | } | |
94c57d6a PA |
5468 | process_event_stop_test (ecs); |
5469 | return; | |
488f131b | 5470 | |
6c95b8df PA |
5471 | case TARGET_WAITKIND_VFORK_DONE: |
5472 | /* Done with the shared memory region. Re-insert breakpoints in | |
5473 | the parent, and keep going. */ | |
5474 | ||
00431a78 | 5475 | context_switch (ecs); |
6c95b8df PA |
5476 | |
5477 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5478 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5479 | |
5480 | if (handle_stop_requested (ecs)) | |
5481 | return; | |
5482 | ||
6c95b8df PA |
5483 | /* This also takes care of reinserting breakpoints in the |
5484 | previously locked inferior. */ | |
5485 | keep_going (ecs); | |
5486 | return; | |
5487 | ||
488f131b | 5488 | case TARGET_WAITKIND_EXECD: |
488f131b | 5489 | |
cbd2b4e3 PA |
5490 | /* Note we can't read registers yet (the stop_pc), because we |
5491 | don't yet know the inferior's post-exec architecture. | |
5492 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5493 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5494 | |
6c95b8df PA |
5495 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5496 | handle_vfork_child_exec_or_exit (1); | |
5497 | ||
795e548f PA |
5498 | /* This causes the eventpoints and symbol table to be reset. |
5499 | Must do this now, before trying to determine whether to | |
5500 | stop. */ | |
71b43ef8 | 5501 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5502 | |
17d8546e DB |
5503 | /* In follow_exec we may have deleted the original thread and |
5504 | created a new one. Make sure that the event thread is the | |
5505 | execd thread for that case (this is a nop otherwise). */ | |
5506 | ecs->event_thread = inferior_thread (); | |
5507 | ||
f2ffa92b PA |
5508 | ecs->event_thread->suspend.stop_pc |
5509 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5510 | |
16c381f0 | 5511 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5512 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5513 | ecs->event_thread->suspend.stop_pc, |
5514 | ecs->event_thread, &ecs->ws); | |
795e548f | 5515 | |
71b43ef8 PA |
5516 | /* Note that this may be referenced from inside |
5517 | bpstat_stop_status above, through inferior_has_execd. */ | |
5518 | xfree (ecs->ws.value.execd_pathname); | |
5519 | ecs->ws.value.execd_pathname = NULL; | |
5520 | ||
c65d6b55 PA |
5521 | if (handle_stop_requested (ecs)) |
5522 | return; | |
5523 | ||
04e68871 | 5524 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5525 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5526 | { |
a493e3e2 | 5527 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5528 | keep_going (ecs); |
5529 | return; | |
5530 | } | |
94c57d6a PA |
5531 | process_event_stop_test (ecs); |
5532 | return; | |
488f131b | 5533 | |
b4dc5ffa MK |
5534 | /* Be careful not to try to gather much state about a thread |
5535 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5536 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5537 | /* Getting the current syscall number. */ |
94c57d6a PA |
5538 | if (handle_syscall_event (ecs) == 0) |
5539 | process_event_stop_test (ecs); | |
5540 | return; | |
c906108c | 5541 | |
488f131b JB |
5542 | /* Before examining the threads further, step this thread to |
5543 | get it entirely out of the syscall. (We get notice of the | |
5544 | event when the thread is just on the verge of exiting a | |
5545 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5546 | into user code.) */ |
488f131b | 5547 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5548 | if (handle_syscall_event (ecs) == 0) |
5549 | process_event_stop_test (ecs); | |
5550 | return; | |
c906108c | 5551 | |
488f131b | 5552 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5553 | handle_signal_stop (ecs); |
5554 | return; | |
c906108c | 5555 | |
b2175913 MS |
5556 | case TARGET_WAITKIND_NO_HISTORY: |
5557 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5558 | |
d1988021 | 5559 | /* Switch to the stopped thread. */ |
00431a78 | 5560 | context_switch (ecs); |
1eb8556f | 5561 | infrun_debug_printf ("stopped"); |
d1988021 | 5562 | |
34b7e8a6 | 5563 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5564 | ecs->event_thread->suspend.stop_pc |
5565 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5566 | |
5567 | if (handle_stop_requested (ecs)) | |
5568 | return; | |
5569 | ||
76727919 | 5570 | gdb::observers::no_history.notify (); |
22bcd14b | 5571 | stop_waiting (ecs); |
b2175913 | 5572 | return; |
488f131b | 5573 | } |
4f5d7f63 PA |
5574 | } |
5575 | ||
372316f1 PA |
5576 | /* Restart threads back to what they were trying to do back when we |
5577 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5578 | ignored. */ | |
4d9d9d04 PA |
5579 | |
5580 | static void | |
372316f1 PA |
5581 | restart_threads (struct thread_info *event_thread) |
5582 | { | |
372316f1 PA |
5583 | /* In case the instruction just stepped spawned a new thread. */ |
5584 | update_thread_list (); | |
5585 | ||
08036331 | 5586 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5587 | { |
f3f8ece4 PA |
5588 | switch_to_thread_no_regs (tp); |
5589 | ||
372316f1 PA |
5590 | if (tp == event_thread) |
5591 | { | |
1eb8556f SM |
5592 | infrun_debug_printf ("restart threads: [%s] is event thread", |
5593 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5594 | continue; |
5595 | } | |
5596 | ||
5597 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5598 | { | |
1eb8556f SM |
5599 | infrun_debug_printf ("restart threads: [%s] not meant to be running", |
5600 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5601 | continue; |
5602 | } | |
5603 | ||
5604 | if (tp->resumed) | |
5605 | { | |
1eb8556f SM |
5606 | infrun_debug_printf ("restart threads: [%s] resumed", |
5607 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5608 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
5609 | continue; | |
5610 | } | |
5611 | ||
5612 | if (thread_is_in_step_over_chain (tp)) | |
5613 | { | |
1eb8556f SM |
5614 | infrun_debug_printf ("restart threads: [%s] needs step-over", |
5615 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5616 | gdb_assert (!tp->resumed); |
5617 | continue; | |
5618 | } | |
5619 | ||
5620 | ||
5621 | if (tp->suspend.waitstatus_pending_p) | |
5622 | { | |
1eb8556f SM |
5623 | infrun_debug_printf ("restart threads: [%s] has pending status", |
5624 | target_pid_to_str (tp->ptid).c_str ()); | |
719546c4 | 5625 | tp->resumed = true; |
372316f1 PA |
5626 | continue; |
5627 | } | |
5628 | ||
c65d6b55 PA |
5629 | gdb_assert (!tp->stop_requested); |
5630 | ||
372316f1 PA |
5631 | /* If some thread needs to start a step-over at this point, it |
5632 | should still be in the step-over queue, and thus skipped | |
5633 | above. */ | |
5634 | if (thread_still_needs_step_over (tp)) | |
5635 | { | |
5636 | internal_error (__FILE__, __LINE__, | |
5637 | "thread [%s] needs a step-over, but not in " | |
5638 | "step-over queue\n", | |
a068643d | 5639 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5640 | } |
5641 | ||
5642 | if (currently_stepping (tp)) | |
5643 | { | |
1eb8556f SM |
5644 | infrun_debug_printf ("restart threads: [%s] was stepping", |
5645 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5646 | keep_going_stepped_thread (tp); |
5647 | } | |
5648 | else | |
5649 | { | |
5650 | struct execution_control_state ecss; | |
5651 | struct execution_control_state *ecs = &ecss; | |
5652 | ||
1eb8556f SM |
5653 | infrun_debug_printf ("restart threads: [%s] continuing", |
5654 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 5655 | reset_ecs (ecs, tp); |
00431a78 | 5656 | switch_to_thread (tp); |
372316f1 PA |
5657 | keep_going_pass_signal (ecs); |
5658 | } | |
5659 | } | |
5660 | } | |
5661 | ||
5662 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5663 | a pending waitstatus. */ | |
5664 | ||
5665 | static int | |
5666 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5667 | void *arg) | |
5668 | { | |
5669 | return (tp->resumed | |
5670 | && tp->suspend.waitstatus_pending_p); | |
5671 | } | |
5672 | ||
5673 | /* Called when we get an event that may finish an in-line or | |
5674 | out-of-line (displaced stepping) step-over started previously. | |
5675 | Return true if the event is processed and we should go back to the | |
5676 | event loop; false if the caller should continue processing the | |
5677 | event. */ | |
5678 | ||
5679 | static int | |
4d9d9d04 PA |
5680 | finish_step_over (struct execution_control_state *ecs) |
5681 | { | |
00431a78 | 5682 | displaced_step_fixup (ecs->event_thread, |
4d9d9d04 PA |
5683 | ecs->event_thread->suspend.stop_signal); |
5684 | ||
c4464ade | 5685 | bool had_step_over_info = step_over_info_valid_p (); |
372316f1 PA |
5686 | |
5687 | if (had_step_over_info) | |
4d9d9d04 PA |
5688 | { |
5689 | /* If we're stepping over a breakpoint with all threads locked, | |
5690 | then only the thread that was stepped should be reporting | |
5691 | back an event. */ | |
5692 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5693 | ||
c65d6b55 | 5694 | clear_step_over_info (); |
4d9d9d04 PA |
5695 | } |
5696 | ||
fbea99ea | 5697 | if (!target_is_non_stop_p ()) |
372316f1 | 5698 | return 0; |
4d9d9d04 PA |
5699 | |
5700 | /* Start a new step-over in another thread if there's one that | |
5701 | needs it. */ | |
5702 | start_step_over (); | |
372316f1 PA |
5703 | |
5704 | /* If we were stepping over a breakpoint before, and haven't started | |
5705 | a new in-line step-over sequence, then restart all other threads | |
5706 | (except the event thread). We can't do this in all-stop, as then | |
5707 | e.g., we wouldn't be able to issue any other remote packet until | |
5708 | these other threads stop. */ | |
5709 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5710 | { | |
5711 | struct thread_info *pending; | |
5712 | ||
5713 | /* If we only have threads with pending statuses, the restart | |
5714 | below won't restart any thread and so nothing re-inserts the | |
5715 | breakpoint we just stepped over. But we need it inserted | |
5716 | when we later process the pending events, otherwise if | |
5717 | another thread has a pending event for this breakpoint too, | |
5718 | we'd discard its event (because the breakpoint that | |
5719 | originally caused the event was no longer inserted). */ | |
00431a78 | 5720 | context_switch (ecs); |
372316f1 PA |
5721 | insert_breakpoints (); |
5722 | ||
5723 | restart_threads (ecs->event_thread); | |
5724 | ||
5725 | /* If we have events pending, go through handle_inferior_event | |
5726 | again, picking up a pending event at random. This avoids | |
5727 | thread starvation. */ | |
5728 | ||
5729 | /* But not if we just stepped over a watchpoint in order to let | |
5730 | the instruction execute so we can evaluate its expression. | |
5731 | The set of watchpoints that triggered is recorded in the | |
5732 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5733 | If we processed another event first, that other event could | |
5734 | clobber this info. */ | |
5735 | if (ecs->event_thread->stepping_over_watchpoint) | |
5736 | return 0; | |
5737 | ||
5738 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5739 | NULL); | |
5740 | if (pending != NULL) | |
5741 | { | |
5742 | struct thread_info *tp = ecs->event_thread; | |
5743 | struct regcache *regcache; | |
5744 | ||
1eb8556f SM |
5745 | infrun_debug_printf ("found resumed threads with " |
5746 | "pending events, saving status"); | |
372316f1 PA |
5747 | |
5748 | gdb_assert (pending != tp); | |
5749 | ||
5750 | /* Record the event thread's event for later. */ | |
5751 | save_waitstatus (tp, &ecs->ws); | |
5752 | /* This was cleared early, by handle_inferior_event. Set it | |
5753 | so this pending event is considered by | |
5754 | do_target_wait. */ | |
719546c4 | 5755 | tp->resumed = true; |
372316f1 PA |
5756 | |
5757 | gdb_assert (!tp->executing); | |
5758 | ||
00431a78 | 5759 | regcache = get_thread_regcache (tp); |
372316f1 PA |
5760 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
5761 | ||
1eb8556f SM |
5762 | infrun_debug_printf ("saved stop_pc=%s for %s " |
5763 | "(currently_stepping=%d)", | |
5764 | paddress (target_gdbarch (), | |
5765 | tp->suspend.stop_pc), | |
5766 | target_pid_to_str (tp->ptid).c_str (), | |
5767 | currently_stepping (tp)); | |
372316f1 PA |
5768 | |
5769 | /* This in-line step-over finished; clear this so we won't | |
5770 | start a new one. This is what handle_signal_stop would | |
5771 | do, if we returned false. */ | |
5772 | tp->stepping_over_breakpoint = 0; | |
5773 | ||
5774 | /* Wake up the event loop again. */ | |
5775 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5776 | ||
5777 | prepare_to_wait (ecs); | |
5778 | return 1; | |
5779 | } | |
5780 | } | |
5781 | ||
5782 | return 0; | |
4d9d9d04 PA |
5783 | } |
5784 | ||
4f5d7f63 PA |
5785 | /* Come here when the program has stopped with a signal. */ |
5786 | ||
5787 | static void | |
5788 | handle_signal_stop (struct execution_control_state *ecs) | |
5789 | { | |
5790 | struct frame_info *frame; | |
5791 | struct gdbarch *gdbarch; | |
5792 | int stopped_by_watchpoint; | |
5793 | enum stop_kind stop_soon; | |
5794 | int random_signal; | |
c906108c | 5795 | |
f0407826 DE |
5796 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5797 | ||
c65d6b55 PA |
5798 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5799 | ||
f0407826 DE |
5800 | /* Do we need to clean up the state of a thread that has |
5801 | completed a displaced single-step? (Doing so usually affects | |
5802 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5803 | if (finish_step_over (ecs)) |
5804 | return; | |
f0407826 DE |
5805 | |
5806 | /* If we either finished a single-step or hit a breakpoint, but | |
5807 | the user wanted this thread to be stopped, pretend we got a | |
5808 | SIG0 (generic unsignaled stop). */ | |
5809 | if (ecs->event_thread->stop_requested | |
5810 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5811 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5812 | |
f2ffa92b PA |
5813 | ecs->event_thread->suspend.stop_pc |
5814 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 5815 | |
527159b7 | 5816 | if (debug_infrun) |
237fc4c9 | 5817 | { |
00431a78 | 5818 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 5819 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 5820 | |
f3f8ece4 | 5821 | switch_to_thread (ecs->event_thread); |
5af949e3 | 5822 | |
1eb8556f SM |
5823 | infrun_debug_printf ("stop_pc=%s", |
5824 | paddress (reg_gdbarch, | |
5825 | ecs->event_thread->suspend.stop_pc)); | |
d92524f1 | 5826 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5827 | { |
5828 | CORE_ADDR addr; | |
abbb1732 | 5829 | |
1eb8556f | 5830 | infrun_debug_printf ("stopped by watchpoint"); |
237fc4c9 | 5831 | |
8b88a78e | 5832 | if (target_stopped_data_address (current_top_target (), &addr)) |
1eb8556f SM |
5833 | infrun_debug_printf ("stopped data address=%s", |
5834 | paddress (reg_gdbarch, addr)); | |
237fc4c9 | 5835 | else |
1eb8556f | 5836 | infrun_debug_printf ("(no data address available)"); |
237fc4c9 PA |
5837 | } |
5838 | } | |
527159b7 | 5839 | |
36fa8042 PA |
5840 | /* This is originated from start_remote(), start_inferior() and |
5841 | shared libraries hook functions. */ | |
00431a78 | 5842 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
5843 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
5844 | { | |
00431a78 | 5845 | context_switch (ecs); |
1eb8556f | 5846 | infrun_debug_printf ("quietly stopped"); |
c4464ade | 5847 | stop_print_frame = true; |
22bcd14b | 5848 | stop_waiting (ecs); |
36fa8042 PA |
5849 | return; |
5850 | } | |
5851 | ||
36fa8042 PA |
5852 | /* This originates from attach_command(). We need to overwrite |
5853 | the stop_signal here, because some kernels don't ignore a | |
5854 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5855 | See more comments in inferior.h. On the other hand, if we | |
5856 | get a non-SIGSTOP, report it to the user - assume the backend | |
5857 | will handle the SIGSTOP if it should show up later. | |
5858 | ||
5859 | Also consider that the attach is complete when we see a | |
5860 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5861 | target extended-remote report it instead of a SIGSTOP | |
5862 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5863 | signal, so this is no exception. | |
5864 | ||
5865 | Also consider that the attach is complete when we see a | |
5866 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5867 | the target to stop all threads of the inferior, in case the | |
5868 | low level attach operation doesn't stop them implicitly. If | |
5869 | they weren't stopped implicitly, then the stub will report a | |
5870 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5871 | other than GDB's request. */ | |
5872 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5873 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5874 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5875 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5876 | { | |
c4464ade | 5877 | stop_print_frame = true; |
22bcd14b | 5878 | stop_waiting (ecs); |
36fa8042 PA |
5879 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5880 | return; | |
5881 | } | |
5882 | ||
488f131b | 5883 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 | 5884 | so, then switch to that thread. */ |
d7e15655 | 5885 | if (ecs->ptid != inferior_ptid) |
488f131b | 5886 | { |
1eb8556f | 5887 | infrun_debug_printf ("context switch"); |
527159b7 | 5888 | |
00431a78 | 5889 | context_switch (ecs); |
c5aa993b | 5890 | |
9a4105ab | 5891 | if (deprecated_context_hook) |
00431a78 | 5892 | deprecated_context_hook (ecs->event_thread->global_num); |
488f131b | 5893 | } |
c906108c | 5894 | |
568d6575 UW |
5895 | /* At this point, get hold of the now-current thread's frame. */ |
5896 | frame = get_current_frame (); | |
5897 | gdbarch = get_frame_arch (frame); | |
5898 | ||
2adfaa28 | 5899 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5900 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5901 | { |
af48d08f | 5902 | struct regcache *regcache; |
af48d08f | 5903 | CORE_ADDR pc; |
2adfaa28 | 5904 | |
00431a78 | 5905 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
5906 | const address_space *aspace = regcache->aspace (); |
5907 | ||
af48d08f | 5908 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 5909 | |
af48d08f PA |
5910 | /* However, before doing so, if this single-step breakpoint was |
5911 | actually for another thread, set this thread up for moving | |
5912 | past it. */ | |
5913 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5914 | aspace, pc)) | |
5915 | { | |
5916 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 | 5917 | { |
1eb8556f SM |
5918 | infrun_debug_printf ("[%s] hit another thread's single-step " |
5919 | "breakpoint", | |
5920 | target_pid_to_str (ecs->ptid).c_str ()); | |
af48d08f PA |
5921 | ecs->hit_singlestep_breakpoint = 1; |
5922 | } | |
5923 | } | |
5924 | else | |
5925 | { | |
1eb8556f SM |
5926 | infrun_debug_printf ("[%s] hit its single-step breakpoint", |
5927 | target_pid_to_str (ecs->ptid).c_str ()); | |
2adfaa28 | 5928 | } |
488f131b | 5929 | } |
af48d08f | 5930 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5931 | |
963f9c80 PA |
5932 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5933 | && ecs->event_thread->control.trap_expected | |
5934 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5935 | stopped_by_watchpoint = 0; |
5936 | else | |
5937 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5938 | ||
5939 | /* If necessary, step over this watchpoint. We'll be back to display | |
5940 | it in a moment. */ | |
5941 | if (stopped_by_watchpoint | |
9aed480c | 5942 | && (target_have_steppable_watchpoint () |
568d6575 | 5943 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5944 | { |
488f131b JB |
5945 | /* At this point, we are stopped at an instruction which has |
5946 | attempted to write to a piece of memory under control of | |
5947 | a watchpoint. The instruction hasn't actually executed | |
5948 | yet. If we were to evaluate the watchpoint expression | |
5949 | now, we would get the old value, and therefore no change | |
5950 | would seem to have occurred. | |
5951 | ||
5952 | In order to make watchpoints work `right', we really need | |
5953 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5954 | watchpoint expression. We do this by single-stepping the |
5955 | target. | |
5956 | ||
7f89fd65 | 5957 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5958 | it. For example, the PA can (with some kernel cooperation) |
5959 | single step over a watchpoint without disabling the watchpoint. | |
5960 | ||
5961 | It is far more common to need to disable a watchpoint to step | |
5962 | the inferior over it. If we have non-steppable watchpoints, | |
5963 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5964 | disable all watchpoints. |
5965 | ||
5966 | Any breakpoint at PC must also be stepped over -- if there's | |
5967 | one, it will have already triggered before the watchpoint | |
5968 | triggered, and we either already reported it to the user, or | |
5969 | it didn't cause a stop and we called keep_going. In either | |
5970 | case, if there was a breakpoint at PC, we must be trying to | |
5971 | step past it. */ | |
5972 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5973 | keep_going (ecs); | |
488f131b JB |
5974 | return; |
5975 | } | |
5976 | ||
4e1c45ea | 5977 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5978 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5979 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5980 | ecs->event_thread->control.stop_step = 0; | |
c4464ade | 5981 | stop_print_frame = true; |
488f131b | 5982 | stopped_by_random_signal = 0; |
ddfe970e | 5983 | bpstat stop_chain = NULL; |
488f131b | 5984 | |
edb3359d DJ |
5985 | /* Hide inlined functions starting here, unless we just performed stepi or |
5986 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5987 | inline function call sites). */ | |
16c381f0 | 5988 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 5989 | { |
00431a78 PA |
5990 | const address_space *aspace |
5991 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
5992 | |
5993 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5994 | determine that the address is one where functions cannot have | |
5995 | been inlined. This improves performance with inferiors that | |
5996 | load a lot of shared libraries, because the solib event | |
5997 | breakpoint is defined as the address of a function (i.e. not | |
5998 | inline). Note that we have to check the previous PC as well | |
5999 | as the current one to catch cases when we have just | |
6000 | single-stepped off a breakpoint prior to reinstating it. | |
6001 | Note that we're assuming that the code we single-step to is | |
6002 | not inline, but that's not definitive: there's nothing | |
6003 | preventing the event breakpoint function from containing | |
6004 | inlined code, and the single-step ending up there. If the | |
6005 | user had set a breakpoint on that inlined code, the missing | |
6006 | skip_inline_frames call would break things. Fortunately | |
6007 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
6008 | if (!pc_at_non_inline_function (aspace, |
6009 | ecs->event_thread->suspend.stop_pc, | |
6010 | &ecs->ws) | |
a210c238 MR |
6011 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
6012 | && ecs->event_thread->control.trap_expected | |
6013 | && pc_at_non_inline_function (aspace, | |
6014 | ecs->event_thread->prev_pc, | |
09ac7c10 | 6015 | &ecs->ws))) |
1c5a993e | 6016 | { |
f2ffa92b PA |
6017 | stop_chain = build_bpstat_chain (aspace, |
6018 | ecs->event_thread->suspend.stop_pc, | |
6019 | &ecs->ws); | |
00431a78 | 6020 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
6021 | |
6022 | /* Re-fetch current thread's frame in case that invalidated | |
6023 | the frame cache. */ | |
6024 | frame = get_current_frame (); | |
6025 | gdbarch = get_frame_arch (frame); | |
6026 | } | |
0574c78f | 6027 | } |
edb3359d | 6028 | |
a493e3e2 | 6029 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 6030 | && ecs->event_thread->control.trap_expected |
568d6575 | 6031 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6032 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6033 | { |
b50d7442 | 6034 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6035 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6036 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6037 | with a delay slot. It needs to be stepped twice, once for |
6038 | the instruction and once for the delay slot. */ | |
6039 | int step_through_delay | |
568d6575 | 6040 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6041 | |
1eb8556f SM |
6042 | if (step_through_delay) |
6043 | infrun_debug_printf ("step through delay"); | |
6044 | ||
16c381f0 JK |
6045 | if (ecs->event_thread->control.step_range_end == 0 |
6046 | && step_through_delay) | |
3352ef37 AC |
6047 | { |
6048 | /* The user issued a continue when stopped at a breakpoint. | |
6049 | Set up for another trap and get out of here. */ | |
4e1c45ea | 6050 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6051 | keep_going (ecs); |
6052 | return; | |
6053 | } | |
6054 | else if (step_through_delay) | |
6055 | { | |
6056 | /* The user issued a step when stopped at a breakpoint. | |
6057 | Maybe we should stop, maybe we should not - the delay | |
6058 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6059 | case, don't decide that here, just set |
6060 | ecs->stepping_over_breakpoint, making sure we | |
6061 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6062 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6063 | } |
6064 | } | |
6065 | ||
ab04a2af TT |
6066 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6067 | handles this event. */ | |
6068 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6069 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
6070 | ecs->event_thread->suspend.stop_pc, |
6071 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 6072 | |
ab04a2af TT |
6073 | /* Following in case break condition called a |
6074 | function. */ | |
c4464ade | 6075 | stop_print_frame = true; |
73dd234f | 6076 | |
ab04a2af TT |
6077 | /* This is where we handle "moribund" watchpoints. Unlike |
6078 | software breakpoints traps, hardware watchpoint traps are | |
6079 | always distinguishable from random traps. If no high-level | |
6080 | watchpoint is associated with the reported stop data address | |
6081 | anymore, then the bpstat does not explain the signal --- | |
6082 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6083 | set. */ | |
6084 | ||
1eb8556f | 6085 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
47591c29 | 6086 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6087 | GDB_SIGNAL_TRAP) |
ab04a2af | 6088 | && stopped_by_watchpoint) |
1eb8556f SM |
6089 | { |
6090 | infrun_debug_printf ("no user watchpoint explains watchpoint SIGTRAP, " | |
6091 | "ignoring"); | |
6092 | } | |
73dd234f | 6093 | |
bac7d97b | 6094 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6095 | at one stage in the past included checks for an inferior |
6096 | function call's call dummy's return breakpoint. The original | |
6097 | comment, that went with the test, read: | |
03cebad2 | 6098 | |
ab04a2af TT |
6099 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6100 | another signal besides SIGTRAP, so check here as well as | |
6101 | above.'' | |
73dd234f | 6102 | |
ab04a2af TT |
6103 | If someone ever tries to get call dummys on a |
6104 | non-executable stack to work (where the target would stop | |
6105 | with something like a SIGSEGV), then those tests might need | |
6106 | to be re-instated. Given, however, that the tests were only | |
6107 | enabled when momentary breakpoints were not being used, I | |
6108 | suspect that it won't be the case. | |
488f131b | 6109 | |
ab04a2af TT |
6110 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6111 | be necessary for call dummies on a non-executable stack on | |
6112 | SPARC. */ | |
488f131b | 6113 | |
bac7d97b | 6114 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6115 | random_signal |
6116 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
6117 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 6118 | |
1cf4d951 PA |
6119 | /* Maybe this was a trap for a software breakpoint that has since |
6120 | been removed. */ | |
6121 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6122 | { | |
5133a315 LM |
6123 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
6124 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
6125 | { |
6126 | struct regcache *regcache; | |
6127 | int decr_pc; | |
6128 | ||
6129 | /* Re-adjust PC to what the program would see if GDB was not | |
6130 | debugging it. */ | |
00431a78 | 6131 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6132 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6133 | if (decr_pc != 0) |
6134 | { | |
07036511 TT |
6135 | gdb::optional<scoped_restore_tmpl<int>> |
6136 | restore_operation_disable; | |
1cf4d951 PA |
6137 | |
6138 | if (record_full_is_used ()) | |
07036511 TT |
6139 | restore_operation_disable.emplace |
6140 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6141 | |
f2ffa92b PA |
6142 | regcache_write_pc (regcache, |
6143 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
6144 | } |
6145 | } | |
6146 | else | |
6147 | { | |
6148 | /* A delayed software breakpoint event. Ignore the trap. */ | |
1eb8556f | 6149 | infrun_debug_printf ("delayed software breakpoint trap, ignoring"); |
1cf4d951 PA |
6150 | random_signal = 0; |
6151 | } | |
6152 | } | |
6153 | ||
6154 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6155 | has since been removed. */ | |
6156 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6157 | { | |
6158 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
1eb8556f SM |
6159 | infrun_debug_printf ("delayed hardware breakpoint/watchpoint " |
6160 | "trap, ignoring"); | |
1cf4d951 PA |
6161 | random_signal = 0; |
6162 | } | |
6163 | ||
bac7d97b PA |
6164 | /* If not, perhaps stepping/nexting can. */ |
6165 | if (random_signal) | |
6166 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6167 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6168 | |
2adfaa28 PA |
6169 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6170 | thread. Single-step breakpoints are transparent to the | |
6171 | breakpoints module. */ | |
6172 | if (random_signal) | |
6173 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6174 | ||
bac7d97b PA |
6175 | /* No? Perhaps we got a moribund watchpoint. */ |
6176 | if (random_signal) | |
6177 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6178 | |
c65d6b55 PA |
6179 | /* Always stop if the user explicitly requested this thread to |
6180 | remain stopped. */ | |
6181 | if (ecs->event_thread->stop_requested) | |
6182 | { | |
6183 | random_signal = 1; | |
1eb8556f | 6184 | infrun_debug_printf ("user-requested stop"); |
c65d6b55 PA |
6185 | } |
6186 | ||
488f131b JB |
6187 | /* For the program's own signals, act according to |
6188 | the signal handling tables. */ | |
6189 | ||
ce12b012 | 6190 | if (random_signal) |
488f131b JB |
6191 | { |
6192 | /* Signal not for debugging purposes. */ | |
5b6d1e4f | 6193 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
c9737c08 | 6194 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6195 | |
1eb8556f SM |
6196 | infrun_debug_printf ("random signal (%s)", |
6197 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6198 | |
488f131b JB |
6199 | stopped_by_random_signal = 1; |
6200 | ||
252fbfc8 PA |
6201 | /* Always stop on signals if we're either just gaining control |
6202 | of the program, or the user explicitly requested this thread | |
6203 | to remain stopped. */ | |
d6b48e9c | 6204 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6205 | || ecs->event_thread->stop_requested |
24291992 | 6206 | || (!inf->detaching |
16c381f0 | 6207 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 6208 | { |
22bcd14b | 6209 | stop_waiting (ecs); |
488f131b JB |
6210 | return; |
6211 | } | |
b57bacec PA |
6212 | |
6213 | /* Notify observers the signal has "handle print" set. Note we | |
6214 | returned early above if stopping; normal_stop handles the | |
6215 | printing in that case. */ | |
6216 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6217 | { | |
6218 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6219 | target_terminal::ours_for_output (); |
76727919 | 6220 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 6221 | target_terminal::inferior (); |
b57bacec | 6222 | } |
488f131b JB |
6223 | |
6224 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6225 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6226 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6227 | |
f2ffa92b | 6228 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 6229 | && ecs->event_thread->control.trap_expected |
8358c15c | 6230 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6231 | { |
6232 | /* We were just starting a new sequence, attempting to | |
6233 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6234 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6235 | of the stepping range so GDB needs to remember to, when |
6236 | the signal handler returns, resume stepping off that | |
6237 | breakpoint. */ | |
6238 | /* To simplify things, "continue" is forced to use the same | |
6239 | code paths as single-step - set a breakpoint at the | |
6240 | signal return address and then, once hit, step off that | |
6241 | breakpoint. */ | |
1eb8556f | 6242 | infrun_debug_printf ("signal arrived while stepping over breakpoint"); |
d3169d93 | 6243 | |
2c03e5be | 6244 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6245 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6246 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6247 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6248 | |
6249 | /* If we were nexting/stepping some other thread, switch to | |
6250 | it, so that we don't continue it, losing control. */ | |
6251 | if (!switch_back_to_stepped_thread (ecs)) | |
6252 | keep_going (ecs); | |
9d799f85 | 6253 | return; |
68f53502 | 6254 | } |
9d799f85 | 6255 | |
e5f8a7cc | 6256 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
6257 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6258 | ecs->event_thread) | |
e5f8a7cc | 6259 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 6260 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6261 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6262 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6263 | { |
6264 | /* The inferior is about to take a signal that will take it | |
6265 | out of the single step range. Set a breakpoint at the | |
6266 | current PC (which is presumably where the signal handler | |
6267 | will eventually return) and then allow the inferior to | |
6268 | run free. | |
6269 | ||
6270 | Note that this is only needed for a signal delivered | |
6271 | while in the single-step range. Nested signals aren't a | |
6272 | problem as they eventually all return. */ | |
1eb8556f | 6273 | infrun_debug_printf ("signal may take us out of single-step range"); |
237fc4c9 | 6274 | |
372316f1 | 6275 | clear_step_over_info (); |
2c03e5be | 6276 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6277 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6278 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6279 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6280 | keep_going (ecs); |
6281 | return; | |
d303a6c7 | 6282 | } |
9d799f85 | 6283 | |
85102364 | 6284 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6285 | when either there's a nested signal, or when there's a |
6286 | pending signal enabled just as the signal handler returns | |
6287 | (leaving the inferior at the step-resume-breakpoint without | |
6288 | actually executing it). Either way continue until the | |
6289 | breakpoint is really hit. */ | |
c447ac0b PA |
6290 | |
6291 | if (!switch_back_to_stepped_thread (ecs)) | |
6292 | { | |
1eb8556f | 6293 | infrun_debug_printf ("random signal, keep going"); |
c447ac0b PA |
6294 | |
6295 | keep_going (ecs); | |
6296 | } | |
6297 | return; | |
488f131b | 6298 | } |
94c57d6a PA |
6299 | |
6300 | process_event_stop_test (ecs); | |
6301 | } | |
6302 | ||
6303 | /* Come here when we've got some debug event / signal we can explain | |
6304 | (IOW, not a random signal), and test whether it should cause a | |
6305 | stop, or whether we should resume the inferior (transparently). | |
6306 | E.g., could be a breakpoint whose condition evaluates false; we | |
6307 | could be still stepping within the line; etc. */ | |
6308 | ||
6309 | static void | |
6310 | process_event_stop_test (struct execution_control_state *ecs) | |
6311 | { | |
6312 | struct symtab_and_line stop_pc_sal; | |
6313 | struct frame_info *frame; | |
6314 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6315 | CORE_ADDR jmp_buf_pc; |
6316 | struct bpstat_what what; | |
94c57d6a | 6317 | |
cdaa5b73 | 6318 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6319 | |
cdaa5b73 PA |
6320 | frame = get_current_frame (); |
6321 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6322 | |
cdaa5b73 | 6323 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6324 | |
cdaa5b73 PA |
6325 | if (what.call_dummy) |
6326 | { | |
6327 | stop_stack_dummy = what.call_dummy; | |
6328 | } | |
186c406b | 6329 | |
243a9253 PA |
6330 | /* A few breakpoint types have callbacks associated (e.g., |
6331 | bp_jit_event). Run them now. */ | |
6332 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6333 | ||
cdaa5b73 PA |
6334 | /* If we hit an internal event that triggers symbol changes, the |
6335 | current frame will be invalidated within bpstat_what (e.g., if we | |
6336 | hit an internal solib event). Re-fetch it. */ | |
6337 | frame = get_current_frame (); | |
6338 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6339 | |
cdaa5b73 PA |
6340 | switch (what.main_action) |
6341 | { | |
6342 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6343 | /* If we hit the breakpoint at longjmp while stepping, we | |
6344 | install a momentary breakpoint at the target of the | |
6345 | jmp_buf. */ | |
186c406b | 6346 | |
1eb8556f | 6347 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME"); |
186c406b | 6348 | |
cdaa5b73 | 6349 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6350 | |
cdaa5b73 PA |
6351 | if (what.is_longjmp) |
6352 | { | |
6353 | struct value *arg_value; | |
6354 | ||
6355 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6356 | then use it to extract the arguments. The destination PC | |
6357 | is the third argument to the probe. */ | |
6358 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6359 | if (arg_value) | |
8fa0c4f8 AA |
6360 | { |
6361 | jmp_buf_pc = value_as_address (arg_value); | |
6362 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6363 | } | |
cdaa5b73 PA |
6364 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6365 | || !gdbarch_get_longjmp_target (gdbarch, | |
6366 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6367 | { |
1eb8556f SM |
6368 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME " |
6369 | "(!gdbarch_get_longjmp_target)"); | |
cdaa5b73 PA |
6370 | keep_going (ecs); |
6371 | return; | |
e2e4d78b | 6372 | } |
e2e4d78b | 6373 | |
cdaa5b73 PA |
6374 | /* Insert a breakpoint at resume address. */ |
6375 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6376 | } | |
6377 | else | |
6378 | check_exception_resume (ecs, frame); | |
6379 | keep_going (ecs); | |
6380 | return; | |
e81a37f7 | 6381 | |
cdaa5b73 PA |
6382 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6383 | { | |
6384 | struct frame_info *init_frame; | |
e81a37f7 | 6385 | |
cdaa5b73 | 6386 | /* There are several cases to consider. |
c906108c | 6387 | |
cdaa5b73 PA |
6388 | 1. The initiating frame no longer exists. In this case we |
6389 | must stop, because the exception or longjmp has gone too | |
6390 | far. | |
2c03e5be | 6391 | |
cdaa5b73 PA |
6392 | 2. The initiating frame exists, and is the same as the |
6393 | current frame. We stop, because the exception or longjmp | |
6394 | has been caught. | |
2c03e5be | 6395 | |
cdaa5b73 PA |
6396 | 3. The initiating frame exists and is different from the |
6397 | current frame. This means the exception or longjmp has | |
6398 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6399 | |
cdaa5b73 PA |
6400 | 4. longjmp breakpoint has been placed just to protect |
6401 | against stale dummy frames and user is not interested in | |
6402 | stopping around longjmps. */ | |
c5aa993b | 6403 | |
1eb8556f | 6404 | infrun_debug_printf ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME"); |
c5aa993b | 6405 | |
cdaa5b73 PA |
6406 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6407 | != NULL); | |
6408 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6409 | |
cdaa5b73 PA |
6410 | if (what.is_longjmp) |
6411 | { | |
b67a2c6f | 6412 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6413 | |
cdaa5b73 | 6414 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6415 | { |
cdaa5b73 PA |
6416 | /* Case 4. */ |
6417 | keep_going (ecs); | |
6418 | return; | |
e5ef252a | 6419 | } |
cdaa5b73 | 6420 | } |
c5aa993b | 6421 | |
cdaa5b73 | 6422 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6423 | |
cdaa5b73 PA |
6424 | if (init_frame) |
6425 | { | |
6426 | struct frame_id current_id | |
6427 | = get_frame_id (get_current_frame ()); | |
6428 | if (frame_id_eq (current_id, | |
6429 | ecs->event_thread->initiating_frame)) | |
6430 | { | |
6431 | /* Case 2. Fall through. */ | |
6432 | } | |
6433 | else | |
6434 | { | |
6435 | /* Case 3. */ | |
6436 | keep_going (ecs); | |
6437 | return; | |
6438 | } | |
68f53502 | 6439 | } |
488f131b | 6440 | |
cdaa5b73 PA |
6441 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6442 | exists. */ | |
6443 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6444 | |
bdc36728 | 6445 | end_stepping_range (ecs); |
cdaa5b73 PA |
6446 | } |
6447 | return; | |
e5ef252a | 6448 | |
cdaa5b73 | 6449 | case BPSTAT_WHAT_SINGLE: |
1eb8556f | 6450 | infrun_debug_printf ("BPSTAT_WHAT_SINGLE"); |
cdaa5b73 PA |
6451 | ecs->event_thread->stepping_over_breakpoint = 1; |
6452 | /* Still need to check other stuff, at least the case where we | |
6453 | are stepping and step out of the right range. */ | |
6454 | break; | |
e5ef252a | 6455 | |
cdaa5b73 | 6456 | case BPSTAT_WHAT_STEP_RESUME: |
1eb8556f | 6457 | infrun_debug_printf ("BPSTAT_WHAT_STEP_RESUME"); |
e5ef252a | 6458 | |
cdaa5b73 PA |
6459 | delete_step_resume_breakpoint (ecs->event_thread); |
6460 | if (ecs->event_thread->control.proceed_to_finish | |
6461 | && execution_direction == EXEC_REVERSE) | |
6462 | { | |
6463 | struct thread_info *tp = ecs->event_thread; | |
6464 | ||
6465 | /* We are finishing a function in reverse, and just hit the | |
6466 | step-resume breakpoint at the start address of the | |
6467 | function, and we're almost there -- just need to back up | |
6468 | by one more single-step, which should take us back to the | |
6469 | function call. */ | |
6470 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6471 | keep_going (ecs); | |
e5ef252a | 6472 | return; |
cdaa5b73 PA |
6473 | } |
6474 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6475 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6476 | && execution_direction == EXEC_REVERSE) |
6477 | { | |
6478 | /* We are stepping over a function call in reverse, and just | |
6479 | hit the step-resume breakpoint at the start address of | |
6480 | the function. Go back to single-stepping, which should | |
6481 | take us back to the function call. */ | |
6482 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6483 | keep_going (ecs); | |
6484 | return; | |
6485 | } | |
6486 | break; | |
e5ef252a | 6487 | |
cdaa5b73 | 6488 | case BPSTAT_WHAT_STOP_NOISY: |
1eb8556f | 6489 | infrun_debug_printf ("BPSTAT_WHAT_STOP_NOISY"); |
c4464ade | 6490 | stop_print_frame = true; |
e5ef252a | 6491 | |
33bf4c5c | 6492 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6493 | whether a/the breakpoint is there when the thread is next |
6494 | resumed. */ | |
6495 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6496 | |
22bcd14b | 6497 | stop_waiting (ecs); |
cdaa5b73 | 6498 | return; |
e5ef252a | 6499 | |
cdaa5b73 | 6500 | case BPSTAT_WHAT_STOP_SILENT: |
1eb8556f | 6501 | infrun_debug_printf ("BPSTAT_WHAT_STOP_SILENT"); |
c4464ade | 6502 | stop_print_frame = false; |
e5ef252a | 6503 | |
33bf4c5c | 6504 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6505 | whether a/the breakpoint is there when the thread is next |
6506 | resumed. */ | |
6507 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6508 | stop_waiting (ecs); |
cdaa5b73 PA |
6509 | return; |
6510 | ||
6511 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
1eb8556f | 6512 | infrun_debug_printf ("BPSTAT_WHAT_HP_STEP_RESUME"); |
cdaa5b73 PA |
6513 | |
6514 | delete_step_resume_breakpoint (ecs->event_thread); | |
6515 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6516 | { | |
6517 | /* Back when the step-resume breakpoint was inserted, we | |
6518 | were trying to single-step off a breakpoint. Go back to | |
6519 | doing that. */ | |
6520 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6521 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6522 | keep_going (ecs); | |
6523 | return; | |
e5ef252a | 6524 | } |
cdaa5b73 PA |
6525 | break; |
6526 | ||
6527 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6528 | break; | |
e5ef252a | 6529 | } |
c906108c | 6530 | |
af48d08f PA |
6531 | /* If we stepped a permanent breakpoint and we had a high priority |
6532 | step-resume breakpoint for the address we stepped, but we didn't | |
6533 | hit it, then we must have stepped into the signal handler. The | |
6534 | step-resume was only necessary to catch the case of _not_ | |
6535 | stepping into the handler, so delete it, and fall through to | |
6536 | checking whether the step finished. */ | |
6537 | if (ecs->event_thread->stepped_breakpoint) | |
6538 | { | |
6539 | struct breakpoint *sr_bp | |
6540 | = ecs->event_thread->control.step_resume_breakpoint; | |
6541 | ||
8d707a12 PA |
6542 | if (sr_bp != NULL |
6543 | && sr_bp->loc->permanent | |
af48d08f PA |
6544 | && sr_bp->type == bp_hp_step_resume |
6545 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6546 | { | |
1eb8556f | 6547 | infrun_debug_printf ("stepped permanent breakpoint, stopped in handler"); |
af48d08f PA |
6548 | delete_step_resume_breakpoint (ecs->event_thread); |
6549 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6550 | } | |
6551 | } | |
6552 | ||
cdaa5b73 PA |
6553 | /* We come here if we hit a breakpoint but should not stop for it. |
6554 | Possibly we also were stepping and should stop for that. So fall | |
6555 | through and test for stepping. But, if not stepping, do not | |
6556 | stop. */ | |
c906108c | 6557 | |
a7212384 UW |
6558 | /* In all-stop mode, if we're currently stepping but have stopped in |
6559 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6560 | if (switch_back_to_stepped_thread (ecs)) |
6561 | return; | |
776f04fa | 6562 | |
8358c15c | 6563 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6564 | { |
1eb8556f | 6565 | infrun_debug_printf ("step-resume breakpoint is inserted"); |
527159b7 | 6566 | |
488f131b JB |
6567 | /* Having a step-resume breakpoint overrides anything |
6568 | else having to do with stepping commands until | |
6569 | that breakpoint is reached. */ | |
488f131b JB |
6570 | keep_going (ecs); |
6571 | return; | |
6572 | } | |
c5aa993b | 6573 | |
16c381f0 | 6574 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6575 | { |
1eb8556f | 6576 | infrun_debug_printf ("no stepping, continue"); |
488f131b | 6577 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6578 | keep_going (ecs); |
6579 | return; | |
6580 | } | |
c5aa993b | 6581 | |
4b7703ad JB |
6582 | /* Re-fetch current thread's frame in case the code above caused |
6583 | the frame cache to be re-initialized, making our FRAME variable | |
6584 | a dangling pointer. */ | |
6585 | frame = get_current_frame (); | |
628fe4e4 | 6586 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6587 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6588 | |
488f131b | 6589 | /* If stepping through a line, keep going if still within it. |
c906108c | 6590 | |
488f131b JB |
6591 | Note that step_range_end is the address of the first instruction |
6592 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6593 | within it! |
6594 | ||
6595 | Note also that during reverse execution, we may be stepping | |
6596 | through a function epilogue and therefore must detect when | |
6597 | the current-frame changes in the middle of a line. */ | |
6598 | ||
f2ffa92b PA |
6599 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6600 | ecs->event_thread) | |
31410e84 | 6601 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6602 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6603 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6604 | { |
1eb8556f SM |
6605 | infrun_debug_printf |
6606 | ("stepping inside range [%s-%s]", | |
6607 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
6608 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6609 | |
c1e36e3e PA |
6610 | /* Tentatively re-enable range stepping; `resume' disables it if |
6611 | necessary (e.g., if we're stepping over a breakpoint or we | |
6612 | have software watchpoints). */ | |
6613 | ecs->event_thread->control.may_range_step = 1; | |
6614 | ||
b2175913 MS |
6615 | /* When stepping backward, stop at beginning of line range |
6616 | (unless it's the function entry point, in which case | |
6617 | keep going back to the call point). */ | |
f2ffa92b | 6618 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6619 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6620 | && stop_pc != ecs->stop_func_start |
6621 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6622 | end_stepping_range (ecs); |
b2175913 MS |
6623 | else |
6624 | keep_going (ecs); | |
6625 | ||
488f131b JB |
6626 | return; |
6627 | } | |
c5aa993b | 6628 | |
488f131b | 6629 | /* We stepped out of the stepping range. */ |
c906108c | 6630 | |
488f131b | 6631 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6632 | loader dynamic symbol resolution code... |
6633 | ||
6634 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6635 | time loader code and reach the callee's address. | |
6636 | ||
6637 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6638 | the runtime loader code is handled just like any other | |
6639 | undebuggable function call. Now we need only keep stepping | |
6640 | backward through the trampoline code, and that's handled further | |
6641 | down, so there is nothing for us to do here. */ | |
6642 | ||
6643 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6644 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6645 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6646 | { |
4c8c40e6 | 6647 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6648 | gdbarch_skip_solib_resolver (gdbarch, |
6649 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6650 | |
1eb8556f | 6651 | infrun_debug_printf ("stepped into dynsym resolve code"); |
527159b7 | 6652 | |
488f131b JB |
6653 | if (pc_after_resolver) |
6654 | { | |
6655 | /* Set up a step-resume breakpoint at the address | |
6656 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6657 | symtab_and_line sr_sal; |
488f131b | 6658 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6659 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6660 | |
a6d9a66e UW |
6661 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6662 | sr_sal, null_frame_id); | |
c5aa993b | 6663 | } |
c906108c | 6664 | |
488f131b JB |
6665 | keep_going (ecs); |
6666 | return; | |
6667 | } | |
c906108c | 6668 | |
1d509aa6 MM |
6669 | /* Step through an indirect branch thunk. */ |
6670 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6671 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6672 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 | 6673 | { |
1eb8556f | 6674 | infrun_debug_printf ("stepped into indirect branch thunk"); |
1d509aa6 MM |
6675 | keep_going (ecs); |
6676 | return; | |
6677 | } | |
6678 | ||
16c381f0 JK |
6679 | if (ecs->event_thread->control.step_range_end != 1 |
6680 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6681 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6682 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6683 | { |
1eb8556f | 6684 | infrun_debug_printf ("stepped into signal trampoline"); |
42edda50 | 6685 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6686 | a signal trampoline (either by a signal being delivered or by |
6687 | the signal handler returning). Just single-step until the | |
6688 | inferior leaves the trampoline (either by calling the handler | |
6689 | or returning). */ | |
488f131b JB |
6690 | keep_going (ecs); |
6691 | return; | |
6692 | } | |
c906108c | 6693 | |
14132e89 MR |
6694 | /* If we're in the return path from a shared library trampoline, |
6695 | we want to proceed through the trampoline when stepping. */ | |
6696 | /* macro/2012-04-25: This needs to come before the subroutine | |
6697 | call check below as on some targets return trampolines look | |
6698 | like subroutine calls (MIPS16 return thunks). */ | |
6699 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
6700 | ecs->event_thread->suspend.stop_pc, |
6701 | ecs->stop_func_name) | |
14132e89 MR |
6702 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6703 | { | |
6704 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
6705 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6706 | CORE_ADDR real_stop_pc | |
6707 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 | 6708 | |
1eb8556f | 6709 | infrun_debug_printf ("stepped into solib return tramp"); |
14132e89 MR |
6710 | |
6711 | /* Only proceed through if we know where it's going. */ | |
6712 | if (real_stop_pc) | |
6713 | { | |
6714 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6715 | symtab_and_line sr_sal; |
14132e89 MR |
6716 | sr_sal.pc = real_stop_pc; |
6717 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6718 | sr_sal.pspace = get_frame_program_space (frame); | |
6719 | ||
6720 | /* Do not specify what the fp should be when we stop since | |
6721 | on some machines the prologue is where the new fp value | |
6722 | is established. */ | |
6723 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6724 | sr_sal, null_frame_id); | |
6725 | ||
6726 | /* Restart without fiddling with the step ranges or | |
6727 | other state. */ | |
6728 | keep_going (ecs); | |
6729 | return; | |
6730 | } | |
6731 | } | |
6732 | ||
c17eaafe DJ |
6733 | /* Check for subroutine calls. The check for the current frame |
6734 | equalling the step ID is not necessary - the check of the | |
6735 | previous frame's ID is sufficient - but it is a common case and | |
6736 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6737 | |
6738 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6739 | being equal, so to get into this block, both the current and | |
6740 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6741 | /* The outer_frame_id check is a heuristic to detect stepping |
6742 | through startup code. If we step over an instruction which | |
6743 | sets the stack pointer from an invalid value to a valid value, | |
6744 | we may detect that as a subroutine call from the mythical | |
6745 | "outermost" function. This could be fixed by marking | |
6746 | outermost frames as !stack_p,code_p,special_p. Then the | |
6747 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6748 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6749 | for more. */ |
edb3359d | 6750 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6751 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6752 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6753 | ecs->event_thread->control.step_stack_frame_id) |
6754 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6755 | outer_frame_id) |
885eeb5b | 6756 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 6757 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 6758 | { |
f2ffa92b | 6759 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 6760 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6761 | |
1eb8556f | 6762 | infrun_debug_printf ("stepped into subroutine"); |
527159b7 | 6763 | |
b7a084be | 6764 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6765 | { |
6766 | /* I presume that step_over_calls is only 0 when we're | |
6767 | supposed to be stepping at the assembly language level | |
6768 | ("stepi"). Just stop. */ | |
388a8562 | 6769 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6770 | end_stepping_range (ecs); |
95918acb AC |
6771 | return; |
6772 | } | |
8fb3e588 | 6773 | |
388a8562 MS |
6774 | /* Reverse stepping through solib trampolines. */ |
6775 | ||
6776 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6777 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6778 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6779 | || (ecs->stop_func_start == 0 | |
6780 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6781 | { | |
6782 | /* Any solib trampoline code can be handled in reverse | |
6783 | by simply continuing to single-step. We have already | |
6784 | executed the solib function (backwards), and a few | |
6785 | steps will take us back through the trampoline to the | |
6786 | caller. */ | |
6787 | keep_going (ecs); | |
6788 | return; | |
6789 | } | |
6790 | ||
16c381f0 | 6791 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6792 | { |
b2175913 MS |
6793 | /* We're doing a "next". |
6794 | ||
6795 | Normal (forward) execution: set a breakpoint at the | |
6796 | callee's return address (the address at which the caller | |
6797 | will resume). | |
6798 | ||
6799 | Reverse (backward) execution. set the step-resume | |
6800 | breakpoint at the start of the function that we just | |
6801 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6802 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6803 | |
6804 | if (execution_direction == EXEC_REVERSE) | |
6805 | { | |
acf9414f JK |
6806 | /* If we're already at the start of the function, we've either |
6807 | just stepped backward into a single instruction function, | |
6808 | or stepped back out of a signal handler to the first instruction | |
6809 | of the function. Just keep going, which will single-step back | |
6810 | to the caller. */ | |
58c48e72 | 6811 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6812 | { |
acf9414f | 6813 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6814 | symtab_and_line sr_sal; |
acf9414f JK |
6815 | sr_sal.pc = ecs->stop_func_start; |
6816 | sr_sal.pspace = get_frame_program_space (frame); | |
6817 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6818 | sr_sal, null_frame_id); | |
6819 | } | |
b2175913 MS |
6820 | } |
6821 | else | |
568d6575 | 6822 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6823 | |
8567c30f AC |
6824 | keep_going (ecs); |
6825 | return; | |
6826 | } | |
a53c66de | 6827 | |
95918acb | 6828 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6829 | calling routine and the real function), locate the real |
6830 | function. That's what tells us (a) whether we want to step | |
6831 | into it at all, and (b) what prologue we want to run to the | |
6832 | end of, if we do step into it. */ | |
568d6575 | 6833 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6834 | if (real_stop_pc == 0) |
568d6575 | 6835 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6836 | if (real_stop_pc != 0) |
6837 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6838 | |
db5f024e | 6839 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6840 | { |
51abb421 | 6841 | symtab_and_line sr_sal; |
1b2bfbb9 | 6842 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6843 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6844 | |
a6d9a66e UW |
6845 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6846 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6847 | keep_going (ecs); |
6848 | return; | |
1b2bfbb9 RC |
6849 | } |
6850 | ||
95918acb | 6851 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6852 | thinking of stepping into and the function isn't on the skip |
6853 | list, step into it. | |
95918acb | 6854 | |
8fb3e588 AC |
6855 | If there are several symtabs at that PC (e.g. with include |
6856 | files), just want to know whether *any* of them have line | |
6857 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6858 | { |
6859 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6860 | |
95918acb | 6861 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6862 | if (tmp_sal.line != 0 |
85817405 | 6863 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
6864 | tmp_sal) |
6865 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 6866 | { |
b2175913 | 6867 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6868 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6869 | else |
568d6575 | 6870 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6871 | return; |
6872 | } | |
6873 | } | |
6874 | ||
6875 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6876 | set, we stop the step so that the user has a chance to switch |
6877 | in assembly mode. */ | |
16c381f0 | 6878 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6879 | && step_stop_if_no_debug) |
95918acb | 6880 | { |
bdc36728 | 6881 | end_stepping_range (ecs); |
95918acb AC |
6882 | return; |
6883 | } | |
6884 | ||
b2175913 MS |
6885 | if (execution_direction == EXEC_REVERSE) |
6886 | { | |
acf9414f JK |
6887 | /* If we're already at the start of the function, we've either just |
6888 | stepped backward into a single instruction function without line | |
6889 | number info, or stepped back out of a signal handler to the first | |
6890 | instruction of the function without line number info. Just keep | |
6891 | going, which will single-step back to the caller. */ | |
6892 | if (ecs->stop_func_start != stop_pc) | |
6893 | { | |
6894 | /* Set a breakpoint at callee's start address. | |
6895 | From there we can step once and be back in the caller. */ | |
51abb421 | 6896 | symtab_and_line sr_sal; |
acf9414f JK |
6897 | sr_sal.pc = ecs->stop_func_start; |
6898 | sr_sal.pspace = get_frame_program_space (frame); | |
6899 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6900 | sr_sal, null_frame_id); | |
6901 | } | |
b2175913 MS |
6902 | } |
6903 | else | |
6904 | /* Set a breakpoint at callee's return address (the address | |
6905 | at which the caller will resume). */ | |
568d6575 | 6906 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6907 | |
95918acb | 6908 | keep_going (ecs); |
488f131b | 6909 | return; |
488f131b | 6910 | } |
c906108c | 6911 | |
fdd654f3 MS |
6912 | /* Reverse stepping through solib trampolines. */ |
6913 | ||
6914 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6915 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 6916 | { |
f2ffa92b PA |
6917 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6918 | ||
fdd654f3 MS |
6919 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6920 | || (ecs->stop_func_start == 0 | |
6921 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6922 | { | |
6923 | /* Any solib trampoline code can be handled in reverse | |
6924 | by simply continuing to single-step. We have already | |
6925 | executed the solib function (backwards), and a few | |
6926 | steps will take us back through the trampoline to the | |
6927 | caller. */ | |
6928 | keep_going (ecs); | |
6929 | return; | |
6930 | } | |
6931 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6932 | { | |
6933 | /* Stepped backward into the solib dynsym resolver. | |
6934 | Set a breakpoint at its start and continue, then | |
6935 | one more step will take us out. */ | |
51abb421 | 6936 | symtab_and_line sr_sal; |
fdd654f3 | 6937 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 6938 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6939 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6940 | sr_sal, null_frame_id); | |
6941 | keep_going (ecs); | |
6942 | return; | |
6943 | } | |
6944 | } | |
6945 | ||
8c95582d AB |
6946 | /* This always returns the sal for the inner-most frame when we are in a |
6947 | stack of inlined frames, even if GDB actually believes that it is in a | |
6948 | more outer frame. This is checked for below by calls to | |
6949 | inline_skipped_frames. */ | |
f2ffa92b | 6950 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 6951 | |
1b2bfbb9 RC |
6952 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6953 | the trampoline processing logic, however, there are some trampolines | |
6954 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6955 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6956 | && ecs->stop_func_name == NULL |
2afb61aa | 6957 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6958 | { |
1eb8556f | 6959 | infrun_debug_printf ("stepped into undebuggable function"); |
527159b7 | 6960 | |
1b2bfbb9 | 6961 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6962 | undebuggable function (where there is no debugging information |
6963 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6964 | inferior stopped). Since we want to skip this kind of code, |
6965 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6966 | function - unless the user has asked us not to (via |
6967 | set step-mode) or we no longer know how to get back | |
6968 | to the call site. */ | |
6969 | if (step_stop_if_no_debug | |
c7ce8faa | 6970 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6971 | { |
6972 | /* If we have no line number and the step-stop-if-no-debug | |
6973 | is set, we stop the step so that the user has a chance to | |
6974 | switch in assembly mode. */ | |
bdc36728 | 6975 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6976 | return; |
6977 | } | |
6978 | else | |
6979 | { | |
6980 | /* Set a breakpoint at callee's return address (the address | |
6981 | at which the caller will resume). */ | |
568d6575 | 6982 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6983 | keep_going (ecs); |
6984 | return; | |
6985 | } | |
6986 | } | |
6987 | ||
16c381f0 | 6988 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6989 | { |
6990 | /* It is stepi or nexti. We always want to stop stepping after | |
6991 | one instruction. */ | |
1eb8556f | 6992 | infrun_debug_printf ("stepi/nexti"); |
bdc36728 | 6993 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6994 | return; |
6995 | } | |
6996 | ||
2afb61aa | 6997 | if (stop_pc_sal.line == 0) |
488f131b JB |
6998 | { |
6999 | /* We have no line number information. That means to stop | |
7000 | stepping (does this always happen right after one instruction, | |
7001 | when we do "s" in a function with no line numbers, | |
7002 | or can this happen as a result of a return or longjmp?). */ | |
1eb8556f | 7003 | infrun_debug_printf ("line number info"); |
bdc36728 | 7004 | end_stepping_range (ecs); |
488f131b JB |
7005 | return; |
7006 | } | |
c906108c | 7007 | |
edb3359d DJ |
7008 | /* Look for "calls" to inlined functions, part one. If the inline |
7009 | frame machinery detected some skipped call sites, we have entered | |
7010 | a new inline function. */ | |
7011 | ||
7012 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7013 | ecs->event_thread->control.step_frame_id) |
00431a78 | 7014 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 7015 | { |
1eb8556f | 7016 | infrun_debug_printf ("stepped into inlined function"); |
edb3359d | 7017 | |
51abb421 | 7018 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 7019 | |
16c381f0 | 7020 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
7021 | { |
7022 | /* For "step", we're going to stop. But if the call site | |
7023 | for this inlined function is on the same source line as | |
7024 | we were previously stepping, go down into the function | |
7025 | first. Otherwise stop at the call site. */ | |
7026 | ||
7027 | if (call_sal.line == ecs->event_thread->current_line | |
7028 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7029 | { |
7030 | step_into_inline_frame (ecs->event_thread); | |
7031 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7032 | { | |
7033 | keep_going (ecs); | |
7034 | return; | |
7035 | } | |
7036 | } | |
edb3359d | 7037 | |
bdc36728 | 7038 | end_stepping_range (ecs); |
edb3359d DJ |
7039 | return; |
7040 | } | |
7041 | else | |
7042 | { | |
7043 | /* For "next", we should stop at the call site if it is on a | |
7044 | different source line. Otherwise continue through the | |
7045 | inlined function. */ | |
7046 | if (call_sal.line == ecs->event_thread->current_line | |
7047 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7048 | keep_going (ecs); | |
7049 | else | |
bdc36728 | 7050 | end_stepping_range (ecs); |
edb3359d DJ |
7051 | return; |
7052 | } | |
7053 | } | |
7054 | ||
7055 | /* Look for "calls" to inlined functions, part two. If we are still | |
7056 | in the same real function we were stepping through, but we have | |
7057 | to go further up to find the exact frame ID, we are stepping | |
7058 | through a more inlined call beyond its call site. */ | |
7059 | ||
7060 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
7061 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7062 | ecs->event_thread->control.step_frame_id) |
edb3359d | 7063 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7064 | ecs->event_thread->control.step_frame_id)) |
edb3359d | 7065 | { |
1eb8556f | 7066 | infrun_debug_printf ("stepping through inlined function"); |
edb3359d | 7067 | |
4a4c04f1 BE |
7068 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7069 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7070 | keep_going (ecs); |
7071 | else | |
bdc36728 | 7072 | end_stepping_range (ecs); |
edb3359d DJ |
7073 | return; |
7074 | } | |
7075 | ||
8c95582d | 7076 | bool refresh_step_info = true; |
f2ffa92b | 7077 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
7078 | && (ecs->event_thread->current_line != stop_pc_sal.line |
7079 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b | 7080 | { |
8c95582d AB |
7081 | if (stop_pc_sal.is_stmt) |
7082 | { | |
7083 | /* We are at the start of a different line. So stop. Note that | |
7084 | we don't stop if we step into the middle of a different line. | |
7085 | That is said to make things like for (;;) statements work | |
7086 | better. */ | |
1eb8556f | 7087 | infrun_debug_printf ("stepped to a different line"); |
8c95582d AB |
7088 | end_stepping_range (ecs); |
7089 | return; | |
7090 | } | |
7091 | else if (frame_id_eq (get_frame_id (get_current_frame ()), | |
7092 | ecs->event_thread->control.step_frame_id)) | |
7093 | { | |
7094 | /* We are at the start of a different line, however, this line is | |
7095 | not marked as a statement, and we have not changed frame. We | |
7096 | ignore this line table entry, and continue stepping forward, | |
7097 | looking for a better place to stop. */ | |
7098 | refresh_step_info = false; | |
1eb8556f SM |
7099 | infrun_debug_printf ("stepped to a different line, but " |
7100 | "it's not the start of a statement"); | |
8c95582d | 7101 | } |
488f131b | 7102 | } |
c906108c | 7103 | |
488f131b | 7104 | /* We aren't done stepping. |
c906108c | 7105 | |
488f131b JB |
7106 | Optimize by setting the stepping range to the line. |
7107 | (We might not be in the original line, but if we entered a | |
7108 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7109 | things like for(;;) statements work better.) |
7110 | ||
7111 | If we entered a SAL that indicates a non-statement line table entry, | |
7112 | then we update the stepping range, but we don't update the step info, | |
7113 | which includes things like the line number we are stepping away from. | |
7114 | This means we will stop when we find a line table entry that is marked | |
7115 | as is-statement, even if it matches the non-statement one we just | |
7116 | stepped into. */ | |
c906108c | 7117 | |
16c381f0 JK |
7118 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7119 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7120 | ecs->event_thread->control.may_range_step = 1; |
8c95582d AB |
7121 | if (refresh_step_info) |
7122 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7123 | |
1eb8556f | 7124 | infrun_debug_printf ("keep going"); |
488f131b | 7125 | keep_going (ecs); |
104c1213 JM |
7126 | } |
7127 | ||
c447ac0b PA |
7128 | /* In all-stop mode, if we're currently stepping but have stopped in |
7129 | some other thread, we may need to switch back to the stepped | |
7130 | thread. Returns true we set the inferior running, false if we left | |
7131 | it stopped (and the event needs further processing). */ | |
7132 | ||
c4464ade | 7133 | static bool |
c447ac0b PA |
7134 | switch_back_to_stepped_thread (struct execution_control_state *ecs) |
7135 | { | |
fbea99ea | 7136 | if (!target_is_non_stop_p ()) |
c447ac0b | 7137 | { |
99619bea PA |
7138 | struct thread_info *stepping_thread; |
7139 | ||
7140 | /* If any thread is blocked on some internal breakpoint, and we | |
7141 | simply need to step over that breakpoint to get it going | |
7142 | again, do that first. */ | |
7143 | ||
7144 | /* However, if we see an event for the stepping thread, then we | |
7145 | know all other threads have been moved past their breakpoints | |
7146 | already. Let the caller check whether the step is finished, | |
7147 | etc., before deciding to move it past a breakpoint. */ | |
7148 | if (ecs->event_thread->control.step_range_end != 0) | |
c4464ade | 7149 | return false; |
99619bea PA |
7150 | |
7151 | /* Check if the current thread is blocked on an incomplete | |
7152 | step-over, interrupted by a random signal. */ | |
7153 | if (ecs->event_thread->control.trap_expected | |
7154 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7155 | { |
1eb8556f SM |
7156 | infrun_debug_printf |
7157 | ("need to finish step-over of [%s]", | |
7158 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
99619bea | 7159 | keep_going (ecs); |
c4464ade | 7160 | return true; |
99619bea | 7161 | } |
2adfaa28 | 7162 | |
99619bea PA |
7163 | /* Check if the current thread is blocked by a single-step |
7164 | breakpoint of another thread. */ | |
7165 | if (ecs->hit_singlestep_breakpoint) | |
7166 | { | |
1eb8556f SM |
7167 | infrun_debug_printf ("need to step [%s] over single-step breakpoint", |
7168 | target_pid_to_str (ecs->ptid).c_str ()); | |
99619bea | 7169 | keep_going (ecs); |
c4464ade | 7170 | return true; |
99619bea PA |
7171 | } |
7172 | ||
4d9d9d04 PA |
7173 | /* If this thread needs yet another step-over (e.g., stepping |
7174 | through a delay slot), do it first before moving on to | |
7175 | another thread. */ | |
7176 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7177 | { | |
1eb8556f SM |
7178 | infrun_debug_printf |
7179 | ("thread [%s] still needs step-over", | |
7180 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
4d9d9d04 | 7181 | keep_going (ecs); |
c4464ade | 7182 | return true; |
4d9d9d04 | 7183 | } |
70509625 | 7184 | |
483805cf PA |
7185 | /* If scheduler locking applies even if not stepping, there's no |
7186 | need to walk over threads. Above we've checked whether the | |
7187 | current thread is stepping. If some other thread not the | |
7188 | event thread is stepping, then it must be that scheduler | |
7189 | locking is not in effect. */ | |
856e7dd6 | 7190 | if (schedlock_applies (ecs->event_thread)) |
c4464ade | 7191 | return false; |
483805cf | 7192 | |
4d9d9d04 PA |
7193 | /* Otherwise, we no longer expect a trap in the current thread. |
7194 | Clear the trap_expected flag before switching back -- this is | |
7195 | what keep_going does as well, if we call it. */ | |
7196 | ecs->event_thread->control.trap_expected = 0; | |
7197 | ||
7198 | /* Likewise, clear the signal if it should not be passed. */ | |
7199 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7200 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7201 | ||
7202 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 7203 | step/next/etc. */ |
4d9d9d04 PA |
7204 | if (start_step_over ()) |
7205 | { | |
7206 | prepare_to_wait (ecs); | |
c4464ade | 7207 | return true; |
4d9d9d04 PA |
7208 | } |
7209 | ||
7210 | /* Look for the stepping/nexting thread. */ | |
483805cf | 7211 | stepping_thread = NULL; |
4d9d9d04 | 7212 | |
08036331 | 7213 | for (thread_info *tp : all_non_exited_threads ()) |
483805cf | 7214 | { |
f3f8ece4 PA |
7215 | switch_to_thread_no_regs (tp); |
7216 | ||
fbea99ea PA |
7217 | /* Ignore threads of processes the caller is not |
7218 | resuming. */ | |
483805cf | 7219 | if (!sched_multi |
5b6d1e4f PA |
7220 | && (tp->inf->process_target () != ecs->target |
7221 | || tp->inf->pid != ecs->ptid.pid ())) | |
483805cf PA |
7222 | continue; |
7223 | ||
7224 | /* When stepping over a breakpoint, we lock all threads | |
7225 | except the one that needs to move past the breakpoint. | |
7226 | If a non-event thread has this set, the "incomplete | |
7227 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
7228 | if (tp->control.trap_expected) |
7229 | { | |
7230 | internal_error (__FILE__, __LINE__, | |
7231 | "[%s] has inconsistent state: " | |
7232 | "trap_expected=%d\n", | |
a068643d | 7233 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
7234 | tp->control.trap_expected); |
7235 | } | |
483805cf PA |
7236 | |
7237 | /* Did we find the stepping thread? */ | |
7238 | if (tp->control.step_range_end) | |
7239 | { | |
7240 | /* Yep. There should only one though. */ | |
7241 | gdb_assert (stepping_thread == NULL); | |
7242 | ||
7243 | /* The event thread is handled at the top, before we | |
7244 | enter this loop. */ | |
7245 | gdb_assert (tp != ecs->event_thread); | |
7246 | ||
7247 | /* If some thread other than the event thread is | |
7248 | stepping, then scheduler locking can't be in effect, | |
7249 | otherwise we wouldn't have resumed the current event | |
7250 | thread in the first place. */ | |
856e7dd6 | 7251 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
7252 | |
7253 | stepping_thread = tp; | |
7254 | } | |
99619bea PA |
7255 | } |
7256 | ||
483805cf | 7257 | if (stepping_thread != NULL) |
99619bea | 7258 | { |
1eb8556f | 7259 | infrun_debug_printf ("switching back to stepped thread"); |
c447ac0b | 7260 | |
2ac7589c PA |
7261 | if (keep_going_stepped_thread (stepping_thread)) |
7262 | { | |
7263 | prepare_to_wait (ecs); | |
c4464ade | 7264 | return true; |
2ac7589c PA |
7265 | } |
7266 | } | |
f3f8ece4 PA |
7267 | |
7268 | switch_to_thread (ecs->event_thread); | |
2ac7589c | 7269 | } |
2adfaa28 | 7270 | |
c4464ade | 7271 | return false; |
2ac7589c | 7272 | } |
2adfaa28 | 7273 | |
2ac7589c PA |
7274 | /* Set a previously stepped thread back to stepping. Returns true on |
7275 | success, false if the resume is not possible (e.g., the thread | |
7276 | vanished). */ | |
7277 | ||
c4464ade | 7278 | static bool |
2ac7589c PA |
7279 | keep_going_stepped_thread (struct thread_info *tp) |
7280 | { | |
7281 | struct frame_info *frame; | |
2ac7589c PA |
7282 | struct execution_control_state ecss; |
7283 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7284 | |
2ac7589c PA |
7285 | /* If the stepping thread exited, then don't try to switch back and |
7286 | resume it, which could fail in several different ways depending | |
7287 | on the target. Instead, just keep going. | |
2adfaa28 | 7288 | |
2ac7589c PA |
7289 | We can find a stepping dead thread in the thread list in two |
7290 | cases: | |
2adfaa28 | 7291 | |
2ac7589c PA |
7292 | - The target supports thread exit events, and when the target |
7293 | tries to delete the thread from the thread list, inferior_ptid | |
7294 | pointed at the exiting thread. In such case, calling | |
7295 | delete_thread does not really remove the thread from the list; | |
7296 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7297 | |
2ac7589c PA |
7298 | - The target's debug interface does not support thread exit |
7299 | events, and so we have no idea whatsoever if the previously | |
7300 | stepping thread is still alive. For that reason, we need to | |
7301 | synchronously query the target now. */ | |
2adfaa28 | 7302 | |
00431a78 | 7303 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c | 7304 | { |
1eb8556f SM |
7305 | infrun_debug_printf ("not resuming previously stepped thread, it has " |
7306 | "vanished"); | |
2ac7589c | 7307 | |
00431a78 | 7308 | delete_thread (tp); |
c4464ade | 7309 | return false; |
c447ac0b | 7310 | } |
2ac7589c | 7311 | |
1eb8556f | 7312 | infrun_debug_printf ("resuming previously stepped thread"); |
2ac7589c PA |
7313 | |
7314 | reset_ecs (ecs, tp); | |
00431a78 | 7315 | switch_to_thread (tp); |
2ac7589c | 7316 | |
f2ffa92b | 7317 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 7318 | frame = get_current_frame (); |
2ac7589c PA |
7319 | |
7320 | /* If the PC of the thread we were trying to single-step has | |
7321 | changed, then that thread has trapped or been signaled, but the | |
7322 | event has not been reported to GDB yet. Re-poll the target | |
7323 | looking for this particular thread's event (i.e. temporarily | |
7324 | enable schedlock) by: | |
7325 | ||
7326 | - setting a break at the current PC | |
7327 | - resuming that particular thread, only (by setting trap | |
7328 | expected) | |
7329 | ||
7330 | This prevents us continuously moving the single-step breakpoint | |
7331 | forward, one instruction at a time, overstepping. */ | |
7332 | ||
f2ffa92b | 7333 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
7334 | { |
7335 | ptid_t resume_ptid; | |
7336 | ||
1eb8556f SM |
7337 | infrun_debug_printf ("expected thread advanced also (%s -> %s)", |
7338 | paddress (target_gdbarch (), tp->prev_pc), | |
7339 | paddress (target_gdbarch (), tp->suspend.stop_pc)); | |
2ac7589c PA |
7340 | |
7341 | /* Clear the info of the previous step-over, as it's no longer | |
7342 | valid (if the thread was trying to step over a breakpoint, it | |
7343 | has already succeeded). It's what keep_going would do too, | |
7344 | if we called it. Do this before trying to insert the sss | |
7345 | breakpoint, otherwise if we were previously trying to step | |
7346 | over this exact address in another thread, the breakpoint is | |
7347 | skipped. */ | |
7348 | clear_step_over_info (); | |
7349 | tp->control.trap_expected = 0; | |
7350 | ||
7351 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7352 | get_frame_address_space (frame), | |
f2ffa92b | 7353 | tp->suspend.stop_pc); |
2ac7589c | 7354 | |
719546c4 | 7355 | tp->resumed = true; |
fbea99ea | 7356 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
c4464ade | 7357 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
2ac7589c PA |
7358 | } |
7359 | else | |
7360 | { | |
1eb8556f | 7361 | infrun_debug_printf ("expected thread still hasn't advanced"); |
2ac7589c PA |
7362 | |
7363 | keep_going_pass_signal (ecs); | |
7364 | } | |
c4464ade SM |
7365 | |
7366 | return true; | |
c447ac0b PA |
7367 | } |
7368 | ||
8b061563 PA |
7369 | /* Is thread TP in the middle of (software or hardware) |
7370 | single-stepping? (Note the result of this function must never be | |
7371 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7372 | |
c4464ade | 7373 | static bool |
b3444185 | 7374 | currently_stepping (struct thread_info *tp) |
a7212384 | 7375 | { |
8358c15c JK |
7376 | return ((tp->control.step_range_end |
7377 | && tp->control.step_resume_breakpoint == NULL) | |
7378 | || tp->control.trap_expected | |
af48d08f | 7379 | || tp->stepped_breakpoint |
8358c15c | 7380 | || bpstat_should_step ()); |
a7212384 UW |
7381 | } |
7382 | ||
b2175913 MS |
7383 | /* Inferior has stepped into a subroutine call with source code that |
7384 | we should not step over. Do step to the first line of code in | |
7385 | it. */ | |
c2c6d25f JM |
7386 | |
7387 | static void | |
568d6575 UW |
7388 | handle_step_into_function (struct gdbarch *gdbarch, |
7389 | struct execution_control_state *ecs) | |
c2c6d25f | 7390 | { |
7e324e48 GB |
7391 | fill_in_stop_func (gdbarch, ecs); |
7392 | ||
f2ffa92b PA |
7393 | compunit_symtab *cust |
7394 | = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); | |
43f3e411 | 7395 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7396 | ecs->stop_func_start |
7397 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7398 | |
51abb421 | 7399 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7400 | /* Use the step_resume_break to step until the end of the prologue, |
7401 | even if that involves jumps (as it seems to on the vax under | |
7402 | 4.2). */ | |
7403 | /* If the prologue ends in the middle of a source line, continue to | |
7404 | the end of that source line (if it is still within the function). | |
7405 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7406 | if (stop_func_sal.end |
7407 | && stop_func_sal.pc != ecs->stop_func_start | |
7408 | && stop_func_sal.end < ecs->stop_func_end) | |
7409 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7410 | |
2dbd5e30 KB |
7411 | /* Architectures which require breakpoint adjustment might not be able |
7412 | to place a breakpoint at the computed address. If so, the test | |
7413 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7414 | ecs->stop_func_start to an address at which a breakpoint may be | |
7415 | legitimately placed. | |
8fb3e588 | 7416 | |
2dbd5e30 KB |
7417 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7418 | made, GDB will enter an infinite loop when stepping through | |
7419 | optimized code consisting of VLIW instructions which contain | |
7420 | subinstructions corresponding to different source lines. On | |
7421 | FR-V, it's not permitted to place a breakpoint on any but the | |
7422 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7423 | set, GDB will adjust the breakpoint address to the beginning of | |
7424 | the VLIW instruction. Thus, we need to make the corresponding | |
7425 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7426 | |
568d6575 | 7427 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7428 | { |
7429 | ecs->stop_func_start | |
568d6575 | 7430 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7431 | ecs->stop_func_start); |
2dbd5e30 KB |
7432 | } |
7433 | ||
f2ffa92b | 7434 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7435 | { |
7436 | /* We are already there: stop now. */ | |
bdc36728 | 7437 | end_stepping_range (ecs); |
c2c6d25f JM |
7438 | return; |
7439 | } | |
7440 | else | |
7441 | { | |
7442 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7443 | symtab_and_line sr_sal; |
c2c6d25f JM |
7444 | sr_sal.pc = ecs->stop_func_start; |
7445 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7446 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7447 | |
c2c6d25f | 7448 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7449 | some machines the prologue is where the new fp value is |
7450 | established. */ | |
a6d9a66e | 7451 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7452 | |
7453 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7454 | ecs->event_thread->control.step_range_end |
7455 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7456 | } |
7457 | keep_going (ecs); | |
7458 | } | |
d4f3574e | 7459 | |
b2175913 MS |
7460 | /* Inferior has stepped backward into a subroutine call with source |
7461 | code that we should not step over. Do step to the beginning of the | |
7462 | last line of code in it. */ | |
7463 | ||
7464 | static void | |
568d6575 UW |
7465 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7466 | struct execution_control_state *ecs) | |
b2175913 | 7467 | { |
43f3e411 | 7468 | struct compunit_symtab *cust; |
167e4384 | 7469 | struct symtab_and_line stop_func_sal; |
b2175913 | 7470 | |
7e324e48 GB |
7471 | fill_in_stop_func (gdbarch, ecs); |
7472 | ||
f2ffa92b | 7473 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7474 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7475 | ecs->stop_func_start |
7476 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7477 | |
f2ffa92b | 7478 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7479 | |
7480 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7481 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7482 | { |
7483 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7484 | end_stepping_range (ecs); |
b2175913 MS |
7485 | } |
7486 | else | |
7487 | { | |
7488 | /* Else just reset the step range and keep going. | |
7489 | No step-resume breakpoint, they don't work for | |
7490 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7491 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7492 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7493 | keep_going (ecs); |
7494 | } | |
7495 | return; | |
7496 | } | |
7497 | ||
d3169d93 | 7498 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7499 | This is used to both functions and to skip over code. */ |
7500 | ||
7501 | static void | |
2c03e5be PA |
7502 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7503 | struct symtab_and_line sr_sal, | |
7504 | struct frame_id sr_id, | |
7505 | enum bptype sr_type) | |
44cbf7b5 | 7506 | { |
611c83ae PA |
7507 | /* There should never be more than one step-resume or longjmp-resume |
7508 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7509 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7510 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7511 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 | 7512 | |
1eb8556f SM |
7513 | infrun_debug_printf ("inserting step-resume breakpoint at %s", |
7514 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7515 | |
8358c15c | 7516 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7517 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7518 | } |
7519 | ||
9da8c2a0 | 7520 | void |
2c03e5be PA |
7521 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7522 | struct symtab_and_line sr_sal, | |
7523 | struct frame_id sr_id) | |
7524 | { | |
7525 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7526 | sr_sal, sr_id, | |
7527 | bp_step_resume); | |
44cbf7b5 | 7528 | } |
7ce450bd | 7529 | |
2c03e5be PA |
7530 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7531 | This is used to skip a potential signal handler. | |
7ce450bd | 7532 | |
14e60db5 DJ |
7533 | This is called with the interrupted function's frame. The signal |
7534 | handler, when it returns, will resume the interrupted function at | |
7535 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7536 | |
7537 | static void | |
2c03e5be | 7538 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7539 | { |
f4c1edd8 | 7540 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7541 | |
51abb421 PA |
7542 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7543 | ||
7544 | symtab_and_line sr_sal; | |
568d6575 | 7545 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7546 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7547 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7548 | |
2c03e5be PA |
7549 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7550 | get_stack_frame_id (return_frame), | |
7551 | bp_hp_step_resume); | |
d303a6c7 AC |
7552 | } |
7553 | ||
2c03e5be PA |
7554 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7555 | is used to skip a function after stepping into it (for "next" or if | |
7556 | the called function has no debugging information). | |
14e60db5 DJ |
7557 | |
7558 | The current function has almost always been reached by single | |
7559 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7560 | current function, and the breakpoint will be set at the caller's | |
7561 | resume address. | |
7562 | ||
7563 | This is a separate function rather than reusing | |
2c03e5be | 7564 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7565 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7566 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7567 | |
7568 | static void | |
7569 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7570 | { | |
14e60db5 DJ |
7571 | /* We shouldn't have gotten here if we don't know where the call site |
7572 | is. */ | |
c7ce8faa | 7573 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7574 | |
51abb421 | 7575 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7576 | |
51abb421 | 7577 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7578 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7579 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7580 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7581 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7582 | |
a6d9a66e | 7583 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7584 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7585 | } |
7586 | ||
611c83ae PA |
7587 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7588 | new breakpoint at the target of a jmp_buf. The handling of | |
7589 | longjmp-resume uses the same mechanisms used for handling | |
7590 | "step-resume" breakpoints. */ | |
7591 | ||
7592 | static void | |
a6d9a66e | 7593 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7594 | { |
e81a37f7 TT |
7595 | /* There should never be more than one longjmp-resume breakpoint per |
7596 | thread, so we should never be setting a new | |
611c83ae | 7597 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7598 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae | 7599 | |
1eb8556f SM |
7600 | infrun_debug_printf ("inserting longjmp-resume breakpoint at %s", |
7601 | paddress (gdbarch, pc)); | |
611c83ae | 7602 | |
e81a37f7 | 7603 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7604 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7605 | } |
7606 | ||
186c406b TT |
7607 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7608 | the exception. The block B is the block of the unwinder debug hook | |
7609 | function. FRAME is the frame corresponding to the call to this | |
7610 | function. SYM is the symbol of the function argument holding the | |
7611 | target PC of the exception. */ | |
7612 | ||
7613 | static void | |
7614 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7615 | const struct block *b, |
186c406b TT |
7616 | struct frame_info *frame, |
7617 | struct symbol *sym) | |
7618 | { | |
a70b8144 | 7619 | try |
186c406b | 7620 | { |
63e43d3a | 7621 | struct block_symbol vsym; |
186c406b TT |
7622 | struct value *value; |
7623 | CORE_ADDR handler; | |
7624 | struct breakpoint *bp; | |
7625 | ||
987012b8 | 7626 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 7627 | b, VAR_DOMAIN); |
63e43d3a | 7628 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7629 | /* If the value was optimized out, revert to the old behavior. */ |
7630 | if (! value_optimized_out (value)) | |
7631 | { | |
7632 | handler = value_as_address (value); | |
7633 | ||
1eb8556f SM |
7634 | infrun_debug_printf ("exception resume at %lx", |
7635 | (unsigned long) handler); | |
186c406b TT |
7636 | |
7637 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7638 | handler, |
7639 | bp_exception_resume).release (); | |
c70a6932 JK |
7640 | |
7641 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7642 | frame = NULL; | |
7643 | ||
5d5658a1 | 7644 | bp->thread = tp->global_num; |
186c406b TT |
7645 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7646 | } | |
7647 | } | |
230d2906 | 7648 | catch (const gdb_exception_error &e) |
492d29ea PA |
7649 | { |
7650 | /* We want to ignore errors here. */ | |
7651 | } | |
186c406b TT |
7652 | } |
7653 | ||
28106bc2 SDJ |
7654 | /* A helper for check_exception_resume that sets an |
7655 | exception-breakpoint based on a SystemTap probe. */ | |
7656 | ||
7657 | static void | |
7658 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7659 | const struct bound_probe *probe, |
28106bc2 SDJ |
7660 | struct frame_info *frame) |
7661 | { | |
7662 | struct value *arg_value; | |
7663 | CORE_ADDR handler; | |
7664 | struct breakpoint *bp; | |
7665 | ||
7666 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7667 | if (!arg_value) | |
7668 | return; | |
7669 | ||
7670 | handler = value_as_address (arg_value); | |
7671 | ||
1eb8556f SM |
7672 | infrun_debug_printf ("exception resume at %s", |
7673 | paddress (probe->objfile->arch (), handler)); | |
28106bc2 SDJ |
7674 | |
7675 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7676 | handler, bp_exception_resume).release (); |
5d5658a1 | 7677 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7678 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7679 | } | |
7680 | ||
186c406b TT |
7681 | /* This is called when an exception has been intercepted. Check to |
7682 | see whether the exception's destination is of interest, and if so, | |
7683 | set an exception resume breakpoint there. */ | |
7684 | ||
7685 | static void | |
7686 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7687 | struct frame_info *frame) |
186c406b | 7688 | { |
729662a5 | 7689 | struct bound_probe probe; |
28106bc2 SDJ |
7690 | struct symbol *func; |
7691 | ||
7692 | /* First see if this exception unwinding breakpoint was set via a | |
7693 | SystemTap probe point. If so, the probe has two arguments: the | |
7694 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7695 | set a breakpoint there. */ | |
6bac7473 | 7696 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7697 | if (probe.prob) |
28106bc2 | 7698 | { |
729662a5 | 7699 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7700 | return; |
7701 | } | |
7702 | ||
7703 | func = get_frame_function (frame); | |
7704 | if (!func) | |
7705 | return; | |
186c406b | 7706 | |
a70b8144 | 7707 | try |
186c406b | 7708 | { |
3977b71f | 7709 | const struct block *b; |
8157b174 | 7710 | struct block_iterator iter; |
186c406b TT |
7711 | struct symbol *sym; |
7712 | int argno = 0; | |
7713 | ||
7714 | /* The exception breakpoint is a thread-specific breakpoint on | |
7715 | the unwinder's debug hook, declared as: | |
7716 | ||
7717 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7718 | ||
7719 | The CFA argument indicates the frame to which control is | |
7720 | about to be transferred. HANDLER is the destination PC. | |
7721 | ||
7722 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7723 | This is not extremely efficient but it avoids issues in gdb | |
7724 | with computing the DWARF CFA, and it also works even in weird | |
7725 | cases such as throwing an exception from inside a signal | |
7726 | handler. */ | |
7727 | ||
7728 | b = SYMBOL_BLOCK_VALUE (func); | |
7729 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7730 | { | |
7731 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7732 | continue; | |
7733 | ||
7734 | if (argno == 0) | |
7735 | ++argno; | |
7736 | else | |
7737 | { | |
7738 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7739 | b, frame, sym); | |
7740 | break; | |
7741 | } | |
7742 | } | |
7743 | } | |
230d2906 | 7744 | catch (const gdb_exception_error &e) |
492d29ea PA |
7745 | { |
7746 | } | |
186c406b TT |
7747 | } |
7748 | ||
104c1213 | 7749 | static void |
22bcd14b | 7750 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7751 | { |
1eb8556f | 7752 | infrun_debug_printf ("stop_waiting"); |
527159b7 | 7753 | |
cd0fc7c3 SS |
7754 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7755 | ecs->wait_some_more = 0; | |
fbea99ea | 7756 | |
53cccef1 | 7757 | /* If all-stop, but there exists a non-stop target, stop all |
fbea99ea | 7758 | threads now that we're presenting the stop to the user. */ |
53cccef1 | 7759 | if (!non_stop && exists_non_stop_target ()) |
fbea99ea | 7760 | stop_all_threads (); |
cd0fc7c3 SS |
7761 | } |
7762 | ||
4d9d9d04 PA |
7763 | /* Like keep_going, but passes the signal to the inferior, even if the |
7764 | signal is set to nopass. */ | |
d4f3574e SS |
7765 | |
7766 | static void | |
4d9d9d04 | 7767 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7768 | { |
d7e15655 | 7769 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 7770 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7771 | |
d4f3574e | 7772 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 7773 | ecs->event_thread->prev_pc |
fc75c28b | 7774 | = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 7775 | |
4d9d9d04 | 7776 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7777 | { |
4d9d9d04 PA |
7778 | struct thread_info *tp = ecs->event_thread; |
7779 | ||
1eb8556f SM |
7780 | infrun_debug_printf ("%s has trap_expected set, " |
7781 | "resuming to collect trap", | |
7782 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 | 7783 | |
a9ba6bae PA |
7784 | /* We haven't yet gotten our trap, and either: intercepted a |
7785 | non-signal event (e.g., a fork); or took a signal which we | |
7786 | are supposed to pass through to the inferior. Simply | |
7787 | continue. */ | |
64ce06e4 | 7788 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7789 | } |
372316f1 PA |
7790 | else if (step_over_info_valid_p ()) |
7791 | { | |
7792 | /* Another thread is stepping over a breakpoint in-line. If | |
7793 | this thread needs a step-over too, queue the request. In | |
7794 | either case, this resume must be deferred for later. */ | |
7795 | struct thread_info *tp = ecs->event_thread; | |
7796 | ||
7797 | if (ecs->hit_singlestep_breakpoint | |
7798 | || thread_still_needs_step_over (tp)) | |
7799 | { | |
1eb8556f SM |
7800 | infrun_debug_printf ("step-over already in progress: " |
7801 | "step-over for %s deferred", | |
7802 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
7803 | thread_step_over_chain_enqueue (tp); |
7804 | } | |
7805 | else | |
7806 | { | |
1eb8556f SM |
7807 | infrun_debug_printf ("step-over in progress: resume of %s deferred", |
7808 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 7809 | } |
372316f1 | 7810 | } |
d4f3574e SS |
7811 | else |
7812 | { | |
31e77af2 | 7813 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7814 | int remove_bp; |
7815 | int remove_wps; | |
8d297bbf | 7816 | step_over_what step_what; |
31e77af2 | 7817 | |
d4f3574e | 7818 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7819 | anyway (if we got a signal, the user asked it be passed to |
7820 | the child) | |
7821 | -- or -- | |
7822 | We got our expected trap, but decided we should resume from | |
7823 | it. | |
d4f3574e | 7824 | |
a9ba6bae | 7825 | We're going to run this baby now! |
d4f3574e | 7826 | |
c36b740a VP |
7827 | Note that insert_breakpoints won't try to re-insert |
7828 | already inserted breakpoints. Therefore, we don't | |
7829 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7830 | |
31e77af2 PA |
7831 | /* If we need to step over a breakpoint, and we're not using |
7832 | displaced stepping to do so, insert all breakpoints | |
7833 | (watchpoints, etc.) but the one we're stepping over, step one | |
7834 | instruction, and then re-insert the breakpoint when that step | |
7835 | is finished. */ | |
963f9c80 | 7836 | |
6c4cfb24 PA |
7837 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7838 | ||
963f9c80 | 7839 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7840 | || (step_what & STEP_OVER_BREAKPOINT)); |
7841 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7842 | |
cb71640d PA |
7843 | /* We can't use displaced stepping if we need to step past a |
7844 | watchpoint. The instruction copied to the scratch pad would | |
7845 | still trigger the watchpoint. */ | |
7846 | if (remove_bp | |
3fc8eb30 | 7847 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7848 | { |
a01bda52 | 7849 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
7850 | regcache_read_pc (regcache), remove_wps, |
7851 | ecs->event_thread->global_num); | |
45e8c884 | 7852 | } |
963f9c80 | 7853 | else if (remove_wps) |
21edc42f | 7854 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
7855 | |
7856 | /* If we now need to do an in-line step-over, we need to stop | |
7857 | all other threads. Note this must be done before | |
7858 | insert_breakpoints below, because that removes the breakpoint | |
7859 | we're about to step over, otherwise other threads could miss | |
7860 | it. */ | |
fbea99ea | 7861 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7862 | stop_all_threads (); |
abbb1732 | 7863 | |
31e77af2 | 7864 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 7865 | try |
31e77af2 PA |
7866 | { |
7867 | insert_breakpoints (); | |
7868 | } | |
230d2906 | 7869 | catch (const gdb_exception_error &e) |
31e77af2 PA |
7870 | { |
7871 | exception_print (gdb_stderr, e); | |
22bcd14b | 7872 | stop_waiting (ecs); |
bdf2a94a | 7873 | clear_step_over_info (); |
31e77af2 | 7874 | return; |
d4f3574e SS |
7875 | } |
7876 | ||
963f9c80 | 7877 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7878 | |
64ce06e4 | 7879 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7880 | } |
7881 | ||
488f131b | 7882 | prepare_to_wait (ecs); |
d4f3574e SS |
7883 | } |
7884 | ||
4d9d9d04 PA |
7885 | /* Called when we should continue running the inferior, because the |
7886 | current event doesn't cause a user visible stop. This does the | |
7887 | resuming part; waiting for the next event is done elsewhere. */ | |
7888 | ||
7889 | static void | |
7890 | keep_going (struct execution_control_state *ecs) | |
7891 | { | |
7892 | if (ecs->event_thread->control.trap_expected | |
7893 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7894 | ecs->event_thread->control.trap_expected = 0; | |
7895 | ||
7896 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7897 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7898 | keep_going_pass_signal (ecs); | |
7899 | } | |
7900 | ||
104c1213 JM |
7901 | /* This function normally comes after a resume, before |
7902 | handle_inferior_event exits. It takes care of any last bits of | |
7903 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7904 | |
104c1213 JM |
7905 | static void |
7906 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7907 | { |
1eb8556f | 7908 | infrun_debug_printf ("prepare_to_wait"); |
104c1213 | 7909 | |
104c1213 | 7910 | ecs->wait_some_more = 1; |
0b333c5e | 7911 | |
42bd97a6 PA |
7912 | /* If the target can't async, emulate it by marking the infrun event |
7913 | handler such that as soon as we get back to the event-loop, we | |
7914 | immediately end up in fetch_inferior_event again calling | |
7915 | target_wait. */ | |
7916 | if (!target_can_async_p ()) | |
0b333c5e | 7917 | mark_infrun_async_event_handler (); |
c906108c | 7918 | } |
11cf8741 | 7919 | |
fd664c91 | 7920 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7921 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7922 | |
7923 | static void | |
bdc36728 | 7924 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7925 | { |
bdc36728 | 7926 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7927 | stop_waiting (ecs); |
fd664c91 PA |
7928 | } |
7929 | ||
33d62d64 JK |
7930 | /* Several print_*_reason functions to print why the inferior has stopped. |
7931 | We always print something when the inferior exits, or receives a signal. | |
7932 | The rest of the cases are dealt with later on in normal_stop and | |
7933 | print_it_typical. Ideally there should be a call to one of these | |
7934 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7935 | stop_waiting is called. |
33d62d64 | 7936 | |
fd664c91 PA |
7937 | Note that we don't call these directly, instead we delegate that to |
7938 | the interpreters, through observers. Interpreters then call these | |
7939 | with whatever uiout is right. */ | |
33d62d64 | 7940 | |
fd664c91 PA |
7941 | void |
7942 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7943 | { |
fd664c91 | 7944 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7945 | |
112e8700 | 7946 | if (uiout->is_mi_like_p ()) |
fd664c91 | 7947 | { |
112e8700 | 7948 | uiout->field_string ("reason", |
fd664c91 PA |
7949 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
7950 | } | |
7951 | } | |
33d62d64 | 7952 | |
fd664c91 PA |
7953 | void |
7954 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7955 | { |
33d62d64 | 7956 | annotate_signalled (); |
112e8700 SM |
7957 | if (uiout->is_mi_like_p ()) |
7958 | uiout->field_string | |
7959 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7960 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 7961 | annotate_signal_name (); |
112e8700 | 7962 | uiout->field_string ("signal-name", |
2ea28649 | 7963 | gdb_signal_to_name (siggnal)); |
33d62d64 | 7964 | annotate_signal_name_end (); |
112e8700 | 7965 | uiout->text (", "); |
33d62d64 | 7966 | annotate_signal_string (); |
112e8700 | 7967 | uiout->field_string ("signal-meaning", |
2ea28649 | 7968 | gdb_signal_to_string (siggnal)); |
33d62d64 | 7969 | annotate_signal_string_end (); |
112e8700 SM |
7970 | uiout->text (".\n"); |
7971 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
7972 | } |
7973 | ||
fd664c91 PA |
7974 | void |
7975 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7976 | { |
fda326dd | 7977 | struct inferior *inf = current_inferior (); |
a068643d | 7978 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 7979 | |
33d62d64 JK |
7980 | annotate_exited (exitstatus); |
7981 | if (exitstatus) | |
7982 | { | |
112e8700 SM |
7983 | if (uiout->is_mi_like_p ()) |
7984 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
7985 | std::string exit_code_str |
7986 | = string_printf ("0%o", (unsigned int) exitstatus); | |
7987 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
7988 | plongest (inf->num), pidstr.c_str (), | |
7989 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
7990 | } |
7991 | else | |
11cf8741 | 7992 | { |
112e8700 SM |
7993 | if (uiout->is_mi_like_p ()) |
7994 | uiout->field_string | |
7995 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
7996 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
7997 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 7998 | } |
33d62d64 JK |
7999 | } |
8000 | ||
fd664c91 PA |
8001 | void |
8002 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 8003 | { |
f303dbd6 PA |
8004 | struct thread_info *thr = inferior_thread (); |
8005 | ||
33d62d64 JK |
8006 | annotate_signal (); |
8007 | ||
112e8700 | 8008 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
8009 | ; |
8010 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 8011 | { |
f303dbd6 | 8012 | const char *name; |
33d62d64 | 8013 | |
112e8700 | 8014 | uiout->text ("\nThread "); |
33eca680 | 8015 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 PA |
8016 | |
8017 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
8018 | if (name != NULL) | |
8019 | { | |
112e8700 | 8020 | uiout->text (" \""); |
33eca680 | 8021 | uiout->field_string ("name", name); |
112e8700 | 8022 | uiout->text ("\""); |
f303dbd6 | 8023 | } |
33d62d64 | 8024 | } |
f303dbd6 | 8025 | else |
112e8700 | 8026 | uiout->text ("\nProgram"); |
f303dbd6 | 8027 | |
112e8700 SM |
8028 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8029 | uiout->text (" stopped"); | |
33d62d64 JK |
8030 | else |
8031 | { | |
112e8700 | 8032 | uiout->text (" received signal "); |
8b93c638 | 8033 | annotate_signal_name (); |
112e8700 SM |
8034 | if (uiout->is_mi_like_p ()) |
8035 | uiout->field_string | |
8036 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8037 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8038 | annotate_signal_name_end (); |
112e8700 | 8039 | uiout->text (", "); |
8b93c638 | 8040 | annotate_signal_string (); |
112e8700 | 8041 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 | 8042 | |
272bb05c JB |
8043 | struct regcache *regcache = get_current_regcache (); |
8044 | struct gdbarch *gdbarch = regcache->arch (); | |
8045 | if (gdbarch_report_signal_info_p (gdbarch)) | |
8046 | gdbarch_report_signal_info (gdbarch, uiout, siggnal); | |
8047 | ||
8b93c638 | 8048 | annotate_signal_string_end (); |
33d62d64 | 8049 | } |
112e8700 | 8050 | uiout->text (".\n"); |
33d62d64 | 8051 | } |
252fbfc8 | 8052 | |
fd664c91 PA |
8053 | void |
8054 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8055 | { |
112e8700 | 8056 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8057 | } |
43ff13b4 | 8058 | |
0c7e1a46 PA |
8059 | /* Print current location without a level number, if we have changed |
8060 | functions or hit a breakpoint. Print source line if we have one. | |
8061 | bpstat_print contains the logic deciding in detail what to print, | |
8062 | based on the event(s) that just occurred. */ | |
8063 | ||
243a9253 PA |
8064 | static void |
8065 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8066 | { |
8067 | int bpstat_ret; | |
f486487f | 8068 | enum print_what source_flag; |
0c7e1a46 PA |
8069 | int do_frame_printing = 1; |
8070 | struct thread_info *tp = inferior_thread (); | |
8071 | ||
8072 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8073 | switch (bpstat_ret) | |
8074 | { | |
8075 | case PRINT_UNKNOWN: | |
8076 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8077 | should) carry around the function and does (or should) use | |
8078 | that when doing a frame comparison. */ | |
8079 | if (tp->control.stop_step | |
8080 | && frame_id_eq (tp->control.step_frame_id, | |
8081 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
8082 | && (tp->control.step_start_function |
8083 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
8084 | { |
8085 | /* Finished step, just print source line. */ | |
8086 | source_flag = SRC_LINE; | |
8087 | } | |
8088 | else | |
8089 | { | |
8090 | /* Print location and source line. */ | |
8091 | source_flag = SRC_AND_LOC; | |
8092 | } | |
8093 | break; | |
8094 | case PRINT_SRC_AND_LOC: | |
8095 | /* Print location and source line. */ | |
8096 | source_flag = SRC_AND_LOC; | |
8097 | break; | |
8098 | case PRINT_SRC_ONLY: | |
8099 | source_flag = SRC_LINE; | |
8100 | break; | |
8101 | case PRINT_NOTHING: | |
8102 | /* Something bogus. */ | |
8103 | source_flag = SRC_LINE; | |
8104 | do_frame_printing = 0; | |
8105 | break; | |
8106 | default: | |
8107 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8108 | } | |
8109 | ||
8110 | /* The behavior of this routine with respect to the source | |
8111 | flag is: | |
8112 | SRC_LINE: Print only source line | |
8113 | LOCATION: Print only location | |
8114 | SRC_AND_LOC: Print location and source line. */ | |
8115 | if (do_frame_printing) | |
8116 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8117 | } |
8118 | ||
243a9253 PA |
8119 | /* See infrun.h. */ |
8120 | ||
8121 | void | |
4c7d57e7 | 8122 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8123 | { |
243a9253 | 8124 | struct target_waitstatus last; |
243a9253 PA |
8125 | struct thread_info *tp; |
8126 | ||
5b6d1e4f | 8127 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8128 | |
67ad9399 TT |
8129 | { |
8130 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8131 | |
67ad9399 | 8132 | print_stop_location (&last); |
243a9253 | 8133 | |
67ad9399 | 8134 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8135 | if (displays) |
8136 | do_displays (); | |
67ad9399 | 8137 | } |
243a9253 PA |
8138 | |
8139 | tp = inferior_thread (); | |
8140 | if (tp->thread_fsm != NULL | |
46e3ed7f | 8141 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
8142 | { |
8143 | struct return_value_info *rv; | |
8144 | ||
46e3ed7f | 8145 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
8146 | if (rv != NULL) |
8147 | print_return_value (uiout, rv); | |
8148 | } | |
0c7e1a46 PA |
8149 | } |
8150 | ||
388a7084 PA |
8151 | /* See infrun.h. */ |
8152 | ||
8153 | void | |
8154 | maybe_remove_breakpoints (void) | |
8155 | { | |
55f6301a | 8156 | if (!breakpoints_should_be_inserted_now () && target_has_execution ()) |
388a7084 PA |
8157 | { |
8158 | if (remove_breakpoints ()) | |
8159 | { | |
223ffa71 | 8160 | target_terminal::ours_for_output (); |
388a7084 PA |
8161 | printf_filtered (_("Cannot remove breakpoints because " |
8162 | "program is no longer writable.\nFurther " | |
8163 | "execution is probably impossible.\n")); | |
8164 | } | |
8165 | } | |
8166 | } | |
8167 | ||
4c2f2a79 PA |
8168 | /* The execution context that just caused a normal stop. */ |
8169 | ||
8170 | struct stop_context | |
8171 | { | |
2d844eaf TT |
8172 | stop_context (); |
8173 | ~stop_context (); | |
8174 | ||
8175 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8176 | ||
8177 | bool changed () const; | |
8178 | ||
4c2f2a79 PA |
8179 | /* The stop ID. */ |
8180 | ULONGEST stop_id; | |
c906108c | 8181 | |
4c2f2a79 | 8182 | /* The event PTID. */ |
c906108c | 8183 | |
4c2f2a79 PA |
8184 | ptid_t ptid; |
8185 | ||
8186 | /* If stopp for a thread event, this is the thread that caused the | |
8187 | stop. */ | |
8188 | struct thread_info *thread; | |
8189 | ||
8190 | /* The inferior that caused the stop. */ | |
8191 | int inf_num; | |
8192 | }; | |
8193 | ||
2d844eaf | 8194 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8195 | takes a strong reference to the thread. */ |
8196 | ||
2d844eaf | 8197 | stop_context::stop_context () |
4c2f2a79 | 8198 | { |
2d844eaf TT |
8199 | stop_id = get_stop_id (); |
8200 | ptid = inferior_ptid; | |
8201 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8202 | |
d7e15655 | 8203 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8204 | { |
8205 | /* Take a strong reference so that the thread can't be deleted | |
8206 | yet. */ | |
2d844eaf TT |
8207 | thread = inferior_thread (); |
8208 | thread->incref (); | |
4c2f2a79 PA |
8209 | } |
8210 | else | |
2d844eaf | 8211 | thread = NULL; |
4c2f2a79 PA |
8212 | } |
8213 | ||
8214 | /* Release a stop context previously created with save_stop_context. | |
8215 | Releases the strong reference to the thread as well. */ | |
8216 | ||
2d844eaf | 8217 | stop_context::~stop_context () |
4c2f2a79 | 8218 | { |
2d844eaf TT |
8219 | if (thread != NULL) |
8220 | thread->decref (); | |
4c2f2a79 PA |
8221 | } |
8222 | ||
8223 | /* Return true if the current context no longer matches the saved stop | |
8224 | context. */ | |
8225 | ||
2d844eaf TT |
8226 | bool |
8227 | stop_context::changed () const | |
8228 | { | |
8229 | if (ptid != inferior_ptid) | |
8230 | return true; | |
8231 | if (inf_num != current_inferior ()->num) | |
8232 | return true; | |
8233 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8234 | return true; | |
8235 | if (get_stop_id () != stop_id) | |
8236 | return true; | |
8237 | return false; | |
4c2f2a79 PA |
8238 | } |
8239 | ||
8240 | /* See infrun.h. */ | |
8241 | ||
8242 | int | |
96baa820 | 8243 | normal_stop (void) |
c906108c | 8244 | { |
73b65bb0 | 8245 | struct target_waitstatus last; |
73b65bb0 | 8246 | |
5b6d1e4f | 8247 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8248 | |
4c2f2a79 PA |
8249 | new_stop_id (); |
8250 | ||
29f49a6a PA |
8251 | /* If an exception is thrown from this point on, make sure to |
8252 | propagate GDB's knowledge of the executing state to the | |
8253 | frontend/user running state. A QUIT is an easy exception to see | |
8254 | here, so do this before any filtered output. */ | |
731f534f | 8255 | |
5b6d1e4f | 8256 | ptid_t finish_ptid = null_ptid; |
731f534f | 8257 | |
c35b1492 | 8258 | if (!non_stop) |
5b6d1e4f | 8259 | finish_ptid = minus_one_ptid; |
e1316e60 PA |
8260 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8261 | || last.kind == TARGET_WAITKIND_EXITED) | |
8262 | { | |
8263 | /* On some targets, we may still have live threads in the | |
8264 | inferior when we get a process exit event. E.g., for | |
8265 | "checkpoint", when the current checkpoint/fork exits, | |
8266 | linux-fork.c automatically switches to another fork from | |
8267 | within target_mourn_inferior. */ | |
731f534f | 8268 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8269 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 PA |
8270 | } |
8271 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5b6d1e4f PA |
8272 | finish_ptid = inferior_ptid; |
8273 | ||
8274 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8275 | if (finish_ptid != null_ptid) | |
8276 | { | |
8277 | maybe_finish_thread_state.emplace | |
8278 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8279 | } | |
29f49a6a | 8280 | |
b57bacec PA |
8281 | /* As we're presenting a stop, and potentially removing breakpoints, |
8282 | update the thread list so we can tell whether there are threads | |
8283 | running on the target. With target remote, for example, we can | |
8284 | only learn about new threads when we explicitly update the thread | |
8285 | list. Do this before notifying the interpreters about signal | |
8286 | stops, end of stepping ranges, etc., so that the "new thread" | |
8287 | output is emitted before e.g., "Program received signal FOO", | |
8288 | instead of after. */ | |
8289 | update_thread_list (); | |
8290 | ||
8291 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 8292 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 8293 | |
c906108c SS |
8294 | /* As with the notification of thread events, we want to delay |
8295 | notifying the user that we've switched thread context until | |
8296 | the inferior actually stops. | |
8297 | ||
73b65bb0 DJ |
8298 | There's no point in saying anything if the inferior has exited. |
8299 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8300 | "received a signal". |
8301 | ||
8302 | Also skip saying anything in non-stop mode. In that mode, as we | |
8303 | don't want GDB to switch threads behind the user's back, to avoid | |
8304 | races where the user is typing a command to apply to thread x, | |
8305 | but GDB switches to thread y before the user finishes entering | |
8306 | the command, fetch_inferior_event installs a cleanup to restore | |
8307 | the current thread back to the thread the user had selected right | |
8308 | after this event is handled, so we're not really switching, only | |
8309 | informing of a stop. */ | |
4f8d22e3 | 8310 | if (!non_stop |
731f534f | 8311 | && previous_inferior_ptid != inferior_ptid |
55f6301a | 8312 | && target_has_execution () |
73b65bb0 | 8313 | && last.kind != TARGET_WAITKIND_SIGNALLED |
0e5bf2a8 PA |
8314 | && last.kind != TARGET_WAITKIND_EXITED |
8315 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8316 | { |
0e454242 | 8317 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8318 | { |
223ffa71 | 8319 | target_terminal::ours_for_output (); |
3b12939d | 8320 | printf_filtered (_("[Switching to %s]\n"), |
a068643d | 8321 | target_pid_to_str (inferior_ptid).c_str ()); |
3b12939d PA |
8322 | annotate_thread_changed (); |
8323 | } | |
39f77062 | 8324 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8325 | } |
c906108c | 8326 | |
0e5bf2a8 PA |
8327 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8328 | { | |
0e454242 | 8329 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8330 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8331 | { | |
223ffa71 | 8332 | target_terminal::ours_for_output (); |
3b12939d PA |
8333 | printf_filtered (_("No unwaited-for children left.\n")); |
8334 | } | |
0e5bf2a8 PA |
8335 | } |
8336 | ||
b57bacec | 8337 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8338 | maybe_remove_breakpoints (); |
c906108c | 8339 | |
c906108c SS |
8340 | /* If an auto-display called a function and that got a signal, |
8341 | delete that auto-display to avoid an infinite recursion. */ | |
8342 | ||
8343 | if (stopped_by_random_signal) | |
8344 | disable_current_display (); | |
8345 | ||
0e454242 | 8346 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8347 | { |
8348 | async_enable_stdin (); | |
8349 | } | |
c906108c | 8350 | |
388a7084 | 8351 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8352 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8353 | |
8354 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8355 | and current location is based on that. Handle the case where the | |
8356 | dummy call is returning after being stopped. E.g. the dummy call | |
8357 | previously hit a breakpoint. (If the dummy call returns | |
8358 | normally, we won't reach here.) Do this before the stop hook is | |
8359 | run, so that it doesn't get to see the temporary dummy frame, | |
8360 | which is not where we'll present the stop. */ | |
8361 | if (has_stack_frames ()) | |
8362 | { | |
8363 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8364 | { | |
8365 | /* Pop the empty frame that contains the stack dummy. This | |
8366 | also restores inferior state prior to the call (struct | |
8367 | infcall_suspend_state). */ | |
8368 | struct frame_info *frame = get_current_frame (); | |
8369 | ||
8370 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8371 | frame_pop (frame); | |
8372 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8373 | does which means there's now no selected frame. */ | |
8374 | } | |
8375 | ||
8376 | select_frame (get_current_frame ()); | |
8377 | ||
8378 | /* Set the current source location. */ | |
8379 | set_current_sal_from_frame (get_current_frame ()); | |
8380 | } | |
dd7e2d2b PA |
8381 | |
8382 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8383 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8384 | if (stop_command != NULL) |
8385 | { | |
2d844eaf | 8386 | stop_context saved_context; |
4c2f2a79 | 8387 | |
a70b8144 | 8388 | try |
bf469271 PA |
8389 | { |
8390 | execute_cmd_pre_hook (stop_command); | |
8391 | } | |
230d2906 | 8392 | catch (const gdb_exception &ex) |
bf469271 PA |
8393 | { |
8394 | exception_fprintf (gdb_stderr, ex, | |
8395 | "Error while running hook_stop:\n"); | |
8396 | } | |
4c2f2a79 PA |
8397 | |
8398 | /* If the stop hook resumes the target, then there's no point in | |
8399 | trying to notify about the previous stop; its context is | |
8400 | gone. Likewise if the command switches thread or inferior -- | |
8401 | the observers would print a stop for the wrong | |
8402 | thread/inferior. */ | |
2d844eaf TT |
8403 | if (saved_context.changed ()) |
8404 | return 1; | |
4c2f2a79 | 8405 | } |
dd7e2d2b | 8406 | |
388a7084 PA |
8407 | /* Notify observers about the stop. This is where the interpreters |
8408 | print the stop event. */ | |
d7e15655 | 8409 | if (inferior_ptid != null_ptid) |
76727919 | 8410 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
388a7084 PA |
8411 | stop_print_frame); |
8412 | else | |
76727919 | 8413 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8414 | |
243a9253 PA |
8415 | annotate_stopped (); |
8416 | ||
55f6301a | 8417 | if (target_has_execution ()) |
48844aa6 PA |
8418 | { |
8419 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
fe726667 PA |
8420 | && last.kind != TARGET_WAITKIND_EXITED |
8421 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8422 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8423 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8424 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8425 | } |
6c95b8df PA |
8426 | |
8427 | /* Try to get rid of automatically added inferiors that are no | |
8428 | longer needed. Keeping those around slows down things linearly. | |
8429 | Note that this never removes the current inferior. */ | |
8430 | prune_inferiors (); | |
4c2f2a79 PA |
8431 | |
8432 | return 0; | |
c906108c | 8433 | } |
c906108c | 8434 | \f |
c5aa993b | 8435 | int |
96baa820 | 8436 | signal_stop_state (int signo) |
c906108c | 8437 | { |
d6b48e9c | 8438 | return signal_stop[signo]; |
c906108c SS |
8439 | } |
8440 | ||
c5aa993b | 8441 | int |
96baa820 | 8442 | signal_print_state (int signo) |
c906108c SS |
8443 | { |
8444 | return signal_print[signo]; | |
8445 | } | |
8446 | ||
c5aa993b | 8447 | int |
96baa820 | 8448 | signal_pass_state (int signo) |
c906108c SS |
8449 | { |
8450 | return signal_program[signo]; | |
8451 | } | |
8452 | ||
2455069d UW |
8453 | static void |
8454 | signal_cache_update (int signo) | |
8455 | { | |
8456 | if (signo == -1) | |
8457 | { | |
a493e3e2 | 8458 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8459 | signal_cache_update (signo); |
8460 | ||
8461 | return; | |
8462 | } | |
8463 | ||
8464 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8465 | && signal_print[signo] == 0 | |
ab04a2af TT |
8466 | && signal_program[signo] == 1 |
8467 | && signal_catch[signo] == 0); | |
2455069d UW |
8468 | } |
8469 | ||
488f131b | 8470 | int |
7bda5e4a | 8471 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8472 | { |
8473 | int ret = signal_stop[signo]; | |
abbb1732 | 8474 | |
d4f3574e | 8475 | signal_stop[signo] = state; |
2455069d | 8476 | signal_cache_update (signo); |
d4f3574e SS |
8477 | return ret; |
8478 | } | |
8479 | ||
488f131b | 8480 | int |
7bda5e4a | 8481 | signal_print_update (int signo, int state) |
d4f3574e SS |
8482 | { |
8483 | int ret = signal_print[signo]; | |
abbb1732 | 8484 | |
d4f3574e | 8485 | signal_print[signo] = state; |
2455069d | 8486 | signal_cache_update (signo); |
d4f3574e SS |
8487 | return ret; |
8488 | } | |
8489 | ||
488f131b | 8490 | int |
7bda5e4a | 8491 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8492 | { |
8493 | int ret = signal_program[signo]; | |
abbb1732 | 8494 | |
d4f3574e | 8495 | signal_program[signo] = state; |
2455069d | 8496 | signal_cache_update (signo); |
d4f3574e SS |
8497 | return ret; |
8498 | } | |
8499 | ||
ab04a2af TT |
8500 | /* Update the global 'signal_catch' from INFO and notify the |
8501 | target. */ | |
8502 | ||
8503 | void | |
8504 | signal_catch_update (const unsigned int *info) | |
8505 | { | |
8506 | int i; | |
8507 | ||
8508 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8509 | signal_catch[i] = info[i] > 0; | |
8510 | signal_cache_update (-1); | |
adc6a863 | 8511 | target_pass_signals (signal_pass); |
ab04a2af TT |
8512 | } |
8513 | ||
c906108c | 8514 | static void |
96baa820 | 8515 | sig_print_header (void) |
c906108c | 8516 | { |
3e43a32a MS |
8517 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8518 | "to program\tDescription\n")); | |
c906108c SS |
8519 | } |
8520 | ||
8521 | static void | |
2ea28649 | 8522 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8523 | { |
2ea28649 | 8524 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8525 | int name_padding = 13 - strlen (name); |
96baa820 | 8526 | |
c906108c SS |
8527 | if (name_padding <= 0) |
8528 | name_padding = 0; | |
8529 | ||
8530 | printf_filtered ("%s", name); | |
488f131b | 8531 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8532 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8533 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8534 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8535 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8536 | } |
8537 | ||
8538 | /* Specify how various signals in the inferior should be handled. */ | |
8539 | ||
8540 | static void | |
0b39b52e | 8541 | handle_command (const char *args, int from_tty) |
c906108c | 8542 | { |
c906108c | 8543 | int digits, wordlen; |
b926417a | 8544 | int sigfirst, siglast; |
2ea28649 | 8545 | enum gdb_signal oursig; |
c906108c | 8546 | int allsigs; |
c906108c SS |
8547 | |
8548 | if (args == NULL) | |
8549 | { | |
e2e0b3e5 | 8550 | error_no_arg (_("signal to handle")); |
c906108c SS |
8551 | } |
8552 | ||
1777feb0 | 8553 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8554 | |
adc6a863 PA |
8555 | const size_t nsigs = GDB_SIGNAL_LAST; |
8556 | unsigned char sigs[nsigs] {}; | |
c906108c | 8557 | |
1777feb0 | 8558 | /* Break the command line up into args. */ |
c906108c | 8559 | |
773a1edc | 8560 | gdb_argv built_argv (args); |
c906108c SS |
8561 | |
8562 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8563 | actions. Signal numbers and signal names may be interspersed with | |
8564 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8565 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8566 | |
773a1edc | 8567 | for (char *arg : built_argv) |
c906108c | 8568 | { |
773a1edc TT |
8569 | wordlen = strlen (arg); |
8570 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8571 | {; |
8572 | } | |
8573 | allsigs = 0; | |
8574 | sigfirst = siglast = -1; | |
8575 | ||
773a1edc | 8576 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8577 | { |
8578 | /* Apply action to all signals except those used by the | |
1777feb0 | 8579 | debugger. Silently skip those. */ |
c906108c SS |
8580 | allsigs = 1; |
8581 | sigfirst = 0; | |
8582 | siglast = nsigs - 1; | |
8583 | } | |
773a1edc | 8584 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8585 | { |
8586 | SET_SIGS (nsigs, sigs, signal_stop); | |
8587 | SET_SIGS (nsigs, sigs, signal_print); | |
8588 | } | |
773a1edc | 8589 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8590 | { |
8591 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8592 | } | |
773a1edc | 8593 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8594 | { |
8595 | SET_SIGS (nsigs, sigs, signal_print); | |
8596 | } | |
773a1edc | 8597 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8598 | { |
8599 | SET_SIGS (nsigs, sigs, signal_program); | |
8600 | } | |
773a1edc | 8601 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8602 | { |
8603 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8604 | } | |
773a1edc | 8605 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8606 | { |
8607 | SET_SIGS (nsigs, sigs, signal_program); | |
8608 | } | |
773a1edc | 8609 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8610 | { |
8611 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8612 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8613 | } | |
773a1edc | 8614 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8615 | { |
8616 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8617 | } | |
8618 | else if (digits > 0) | |
8619 | { | |
8620 | /* It is numeric. The numeric signal refers to our own | |
8621 | internal signal numbering from target.h, not to host/target | |
8622 | signal number. This is a feature; users really should be | |
8623 | using symbolic names anyway, and the common ones like | |
8624 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8625 | ||
8626 | sigfirst = siglast = (int) | |
773a1edc TT |
8627 | gdb_signal_from_command (atoi (arg)); |
8628 | if (arg[digits] == '-') | |
c906108c SS |
8629 | { |
8630 | siglast = (int) | |
773a1edc | 8631 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8632 | } |
8633 | if (sigfirst > siglast) | |
8634 | { | |
1777feb0 | 8635 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8636 | std::swap (sigfirst, siglast); |
c906108c SS |
8637 | } |
8638 | } | |
8639 | else | |
8640 | { | |
773a1edc | 8641 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8642 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8643 | { |
8644 | sigfirst = siglast = (int) oursig; | |
8645 | } | |
8646 | else | |
8647 | { | |
8648 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8649 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8650 | } |
8651 | } | |
8652 | ||
8653 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8654 | which signals to apply actions to. */ |
c906108c | 8655 | |
b926417a | 8656 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8657 | { |
2ea28649 | 8658 | switch ((enum gdb_signal) signum) |
c906108c | 8659 | { |
a493e3e2 PA |
8660 | case GDB_SIGNAL_TRAP: |
8661 | case GDB_SIGNAL_INT: | |
c906108c SS |
8662 | if (!allsigs && !sigs[signum]) |
8663 | { | |
9e2f0ad4 | 8664 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8665 | Are you sure you want to change it? "), |
2ea28649 | 8666 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8667 | { |
8668 | sigs[signum] = 1; | |
8669 | } | |
8670 | else | |
c119e040 | 8671 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8672 | } |
8673 | break; | |
a493e3e2 PA |
8674 | case GDB_SIGNAL_0: |
8675 | case GDB_SIGNAL_DEFAULT: | |
8676 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8677 | /* Make sure that "all" doesn't print these. */ |
8678 | break; | |
8679 | default: | |
8680 | sigs[signum] = 1; | |
8681 | break; | |
8682 | } | |
8683 | } | |
c906108c SS |
8684 | } |
8685 | ||
b926417a | 8686 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8687 | if (sigs[signum]) |
8688 | { | |
2455069d | 8689 | signal_cache_update (-1); |
adc6a863 PA |
8690 | target_pass_signals (signal_pass); |
8691 | target_program_signals (signal_program); | |
c906108c | 8692 | |
3a031f65 PA |
8693 | if (from_tty) |
8694 | { | |
8695 | /* Show the results. */ | |
8696 | sig_print_header (); | |
8697 | for (; signum < nsigs; signum++) | |
8698 | if (sigs[signum]) | |
aead7601 | 8699 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8700 | } |
8701 | ||
8702 | break; | |
8703 | } | |
c906108c SS |
8704 | } |
8705 | ||
de0bea00 MF |
8706 | /* Complete the "handle" command. */ |
8707 | ||
eb3ff9a5 | 8708 | static void |
de0bea00 | 8709 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8710 | completion_tracker &tracker, |
6f937416 | 8711 | const char *text, const char *word) |
de0bea00 | 8712 | { |
de0bea00 MF |
8713 | static const char * const keywords[] = |
8714 | { | |
8715 | "all", | |
8716 | "stop", | |
8717 | "ignore", | |
8718 | "print", | |
8719 | "pass", | |
8720 | "nostop", | |
8721 | "noignore", | |
8722 | "noprint", | |
8723 | "nopass", | |
8724 | NULL, | |
8725 | }; | |
8726 | ||
eb3ff9a5 PA |
8727 | signal_completer (ignore, tracker, text, word); |
8728 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8729 | } |
8730 | ||
2ea28649 PA |
8731 | enum gdb_signal |
8732 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8733 | { |
8734 | if (num >= 1 && num <= 15) | |
2ea28649 | 8735 | return (enum gdb_signal) num; |
ed01b82c PA |
8736 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8737 | Use \"info signals\" for a list of symbolic signals.")); | |
8738 | } | |
8739 | ||
c906108c SS |
8740 | /* Print current contents of the tables set by the handle command. |
8741 | It is possible we should just be printing signals actually used | |
8742 | by the current target (but for things to work right when switching | |
8743 | targets, all signals should be in the signal tables). */ | |
8744 | ||
8745 | static void | |
1d12d88f | 8746 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8747 | { |
2ea28649 | 8748 | enum gdb_signal oursig; |
abbb1732 | 8749 | |
c906108c SS |
8750 | sig_print_header (); |
8751 | ||
8752 | if (signum_exp) | |
8753 | { | |
8754 | /* First see if this is a symbol name. */ | |
2ea28649 | 8755 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8756 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8757 | { |
8758 | /* No, try numeric. */ | |
8759 | oursig = | |
2ea28649 | 8760 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8761 | } |
8762 | sig_print_info (oursig); | |
8763 | return; | |
8764 | } | |
8765 | ||
8766 | printf_filtered ("\n"); | |
8767 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8768 | for (oursig = GDB_SIGNAL_FIRST; |
8769 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8770 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8771 | { |
8772 | QUIT; | |
8773 | ||
a493e3e2 PA |
8774 | if (oursig != GDB_SIGNAL_UNKNOWN |
8775 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8776 | sig_print_info (oursig); |
8777 | } | |
8778 | ||
3e43a32a MS |
8779 | printf_filtered (_("\nUse the \"handle\" command " |
8780 | "to change these tables.\n")); | |
c906108c | 8781 | } |
4aa995e1 PA |
8782 | |
8783 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8784 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8785 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8786 | also dependent on which thread you have selected. |
8787 | ||
8788 | 1. making $_siginfo be an internalvar that creates a new value on | |
8789 | access. | |
8790 | ||
8791 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8792 | ||
8793 | /* This function implements the lval_computed support for reading a | |
8794 | $_siginfo value. */ | |
8795 | ||
8796 | static void | |
8797 | siginfo_value_read (struct value *v) | |
8798 | { | |
8799 | LONGEST transferred; | |
8800 | ||
a911d87a PA |
8801 | /* If we can access registers, so can we access $_siginfo. Likewise |
8802 | vice versa. */ | |
8803 | validate_registers_access (); | |
c709acd1 | 8804 | |
4aa995e1 | 8805 | transferred = |
8b88a78e | 8806 | target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, |
4aa995e1 PA |
8807 | NULL, |
8808 | value_contents_all_raw (v), | |
8809 | value_offset (v), | |
8810 | TYPE_LENGTH (value_type (v))); | |
8811 | ||
8812 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8813 | error (_("Unable to read siginfo")); | |
8814 | } | |
8815 | ||
8816 | /* This function implements the lval_computed support for writing a | |
8817 | $_siginfo value. */ | |
8818 | ||
8819 | static void | |
8820 | siginfo_value_write (struct value *v, struct value *fromval) | |
8821 | { | |
8822 | LONGEST transferred; | |
8823 | ||
a911d87a PA |
8824 | /* If we can access registers, so can we access $_siginfo. Likewise |
8825 | vice versa. */ | |
8826 | validate_registers_access (); | |
c709acd1 | 8827 | |
8b88a78e | 8828 | transferred = target_write (current_top_target (), |
4aa995e1 PA |
8829 | TARGET_OBJECT_SIGNAL_INFO, |
8830 | NULL, | |
8831 | value_contents_all_raw (fromval), | |
8832 | value_offset (v), | |
8833 | TYPE_LENGTH (value_type (fromval))); | |
8834 | ||
8835 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8836 | error (_("Unable to write siginfo")); | |
8837 | } | |
8838 | ||
c8f2448a | 8839 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8840 | { |
8841 | siginfo_value_read, | |
8842 | siginfo_value_write | |
8843 | }; | |
8844 | ||
8845 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8846 | the current thread using architecture GDBARCH. Return a void value |
8847 | if there's no object available. */ | |
4aa995e1 | 8848 | |
2c0b251b | 8849 | static struct value * |
22d2b532 SDJ |
8850 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8851 | void *ignore) | |
4aa995e1 | 8852 | { |
841de120 | 8853 | if (target_has_stack () |
d7e15655 | 8854 | && inferior_ptid != null_ptid |
78267919 | 8855 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 8856 | { |
78267919 | 8857 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8858 | |
78267919 | 8859 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8860 | } |
8861 | ||
78267919 | 8862 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8863 | } |
8864 | ||
c906108c | 8865 | \f |
16c381f0 JK |
8866 | /* infcall_suspend_state contains state about the program itself like its |
8867 | registers and any signal it received when it last stopped. | |
8868 | This state must be restored regardless of how the inferior function call | |
8869 | ends (either successfully, or after it hits a breakpoint or signal) | |
8870 | if the program is to properly continue where it left off. */ | |
8871 | ||
6bf78e29 | 8872 | class infcall_suspend_state |
7a292a7a | 8873 | { |
6bf78e29 AB |
8874 | public: |
8875 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
8876 | once the inferior function call has finished. */ | |
8877 | infcall_suspend_state (struct gdbarch *gdbarch, | |
8878 | const struct thread_info *tp, | |
8879 | struct regcache *regcache) | |
8880 | : m_thread_suspend (tp->suspend), | |
8881 | m_registers (new readonly_detached_regcache (*regcache)) | |
8882 | { | |
8883 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
8884 | ||
8885 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8886 | { | |
8887 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8888 | size_t len = TYPE_LENGTH (type); | |
8889 | ||
8890 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); | |
8891 | ||
8892 | if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8893 | siginfo_data.get (), 0, len) != len) | |
8894 | { | |
8895 | /* Errors ignored. */ | |
8896 | siginfo_data.reset (nullptr); | |
8897 | } | |
8898 | } | |
8899 | ||
8900 | if (siginfo_data) | |
8901 | { | |
8902 | m_siginfo_gdbarch = gdbarch; | |
8903 | m_siginfo_data = std::move (siginfo_data); | |
8904 | } | |
8905 | } | |
8906 | ||
8907 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 8908 | |
6bf78e29 AB |
8909 | readonly_detached_regcache *registers () const |
8910 | { | |
8911 | return m_registers.get (); | |
8912 | } | |
8913 | ||
8914 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
8915 | ||
8916 | void restore (struct gdbarch *gdbarch, | |
8917 | struct thread_info *tp, | |
8918 | struct regcache *regcache) const | |
8919 | { | |
8920 | tp->suspend = m_thread_suspend; | |
8921 | ||
8922 | if (m_siginfo_gdbarch == gdbarch) | |
8923 | { | |
8924 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8925 | ||
8926 | /* Errors ignored. */ | |
8927 | target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8928 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); | |
8929 | } | |
8930 | ||
8931 | /* The inferior can be gone if the user types "print exit(0)" | |
8932 | (and perhaps other times). */ | |
55f6301a | 8933 | if (target_has_execution ()) |
6bf78e29 AB |
8934 | /* NB: The register write goes through to the target. */ |
8935 | regcache->restore (registers ()); | |
8936 | } | |
8937 | ||
8938 | private: | |
8939 | /* How the current thread stopped before the inferior function call was | |
8940 | executed. */ | |
8941 | struct thread_suspend_state m_thread_suspend; | |
8942 | ||
8943 | /* The registers before the inferior function call was executed. */ | |
8944 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 8945 | |
35515841 | 8946 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 8947 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
8948 | |
8949 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8950 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8951 | content would be invalid. */ | |
6bf78e29 | 8952 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
8953 | }; |
8954 | ||
cb524840 TT |
8955 | infcall_suspend_state_up |
8956 | save_infcall_suspend_state () | |
b89667eb | 8957 | { |
b89667eb | 8958 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 8959 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8960 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 8961 | |
6bf78e29 AB |
8962 | infcall_suspend_state_up inf_state |
8963 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 8964 | |
6bf78e29 AB |
8965 | /* Having saved the current state, adjust the thread state, discarding |
8966 | any stop signal information. The stop signal is not useful when | |
8967 | starting an inferior function call, and run_inferior_call will not use | |
8968 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 8969 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 8970 | |
b89667eb DE |
8971 | return inf_state; |
8972 | } | |
8973 | ||
8974 | /* Restore inferior session state to INF_STATE. */ | |
8975 | ||
8976 | void | |
16c381f0 | 8977 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8978 | { |
8979 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 8980 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8981 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 8982 | |
6bf78e29 | 8983 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 8984 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8985 | } |
8986 | ||
b89667eb | 8987 | void |
16c381f0 | 8988 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 8989 | { |
dd848631 | 8990 | delete inf_state; |
b89667eb DE |
8991 | } |
8992 | ||
daf6667d | 8993 | readonly_detached_regcache * |
16c381f0 | 8994 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 8995 | { |
6bf78e29 | 8996 | return inf_state->registers (); |
b89667eb DE |
8997 | } |
8998 | ||
16c381f0 JK |
8999 | /* infcall_control_state contains state regarding gdb's control of the |
9000 | inferior itself like stepping control. It also contains session state like | |
9001 | the user's currently selected frame. */ | |
b89667eb | 9002 | |
16c381f0 | 9003 | struct infcall_control_state |
b89667eb | 9004 | { |
16c381f0 JK |
9005 | struct thread_control_state thread_control; |
9006 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
9007 | |
9008 | /* Other fields: */ | |
ee841dd8 TT |
9009 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
9010 | int stopped_by_random_signal = 0; | |
7a292a7a | 9011 | |
79952e69 PA |
9012 | /* ID and level of the selected frame when the inferior function |
9013 | call was made. */ | |
ee841dd8 | 9014 | struct frame_id selected_frame_id {}; |
79952e69 | 9015 | int selected_frame_level = -1; |
7a292a7a SS |
9016 | }; |
9017 | ||
c906108c | 9018 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9019 | connection. */ |
c906108c | 9020 | |
cb524840 TT |
9021 | infcall_control_state_up |
9022 | save_infcall_control_state () | |
c906108c | 9023 | { |
cb524840 | 9024 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9025 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9026 | struct inferior *inf = current_inferior (); |
7a292a7a | 9027 | |
16c381f0 JK |
9028 | inf_status->thread_control = tp->control; |
9029 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9030 | |
8358c15c | 9031 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9032 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9033 | |
16c381f0 JK |
9034 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9035 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9036 | hand them back the original chain when restore_infcall_control_state is | |
9037 | called. */ | |
9038 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9039 | |
9040 | /* Other fields: */ | |
9041 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9042 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9043 | |
79952e69 PA |
9044 | save_selected_frame (&inf_status->selected_frame_id, |
9045 | &inf_status->selected_frame_level); | |
b89667eb | 9046 | |
7a292a7a | 9047 | return inf_status; |
c906108c SS |
9048 | } |
9049 | ||
b89667eb DE |
9050 | /* Restore inferior session state to INF_STATUS. */ |
9051 | ||
c906108c | 9052 | void |
16c381f0 | 9053 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9054 | { |
4e1c45ea | 9055 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9056 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9057 | |
8358c15c JK |
9058 | if (tp->control.step_resume_breakpoint) |
9059 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9060 | ||
5b79abe7 TT |
9061 | if (tp->control.exception_resume_breakpoint) |
9062 | tp->control.exception_resume_breakpoint->disposition | |
9063 | = disp_del_at_next_stop; | |
9064 | ||
d82142e2 | 9065 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9066 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9067 | |
16c381f0 JK |
9068 | tp->control = inf_status->thread_control; |
9069 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9070 | |
9071 | /* Other fields: */ | |
9072 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9073 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9074 | |
841de120 | 9075 | if (target_has_stack ()) |
c906108c | 9076 | { |
79952e69 PA |
9077 | restore_selected_frame (inf_status->selected_frame_id, |
9078 | inf_status->selected_frame_level); | |
c906108c | 9079 | } |
c906108c | 9080 | |
ee841dd8 | 9081 | delete inf_status; |
7a292a7a | 9082 | } |
c906108c SS |
9083 | |
9084 | void | |
16c381f0 | 9085 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9086 | { |
8358c15c JK |
9087 | if (inf_status->thread_control.step_resume_breakpoint) |
9088 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9089 | = disp_del_at_next_stop; | |
9090 | ||
5b79abe7 TT |
9091 | if (inf_status->thread_control.exception_resume_breakpoint) |
9092 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9093 | = disp_del_at_next_stop; | |
9094 | ||
1777feb0 | 9095 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9096 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9097 | |
ee841dd8 | 9098 | delete inf_status; |
7a292a7a | 9099 | } |
b89667eb | 9100 | \f |
7f89fd65 | 9101 | /* See infrun.h. */ |
0c557179 SDJ |
9102 | |
9103 | void | |
9104 | clear_exit_convenience_vars (void) | |
9105 | { | |
9106 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9107 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9108 | } | |
c5aa993b | 9109 | \f |
488f131b | 9110 | |
b2175913 MS |
9111 | /* User interface for reverse debugging: |
9112 | Set exec-direction / show exec-direction commands | |
9113 | (returns error unless target implements to_set_exec_direction method). */ | |
9114 | ||
170742de | 9115 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9116 | static const char exec_forward[] = "forward"; |
9117 | static const char exec_reverse[] = "reverse"; | |
9118 | static const char *exec_direction = exec_forward; | |
40478521 | 9119 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9120 | exec_forward, |
9121 | exec_reverse, | |
9122 | NULL | |
9123 | }; | |
9124 | ||
9125 | static void | |
eb4c3f4a | 9126 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9127 | struct cmd_list_element *cmd) |
9128 | { | |
05374cfd | 9129 | if (target_can_execute_reverse ()) |
b2175913 MS |
9130 | { |
9131 | if (!strcmp (exec_direction, exec_forward)) | |
9132 | execution_direction = EXEC_FORWARD; | |
9133 | else if (!strcmp (exec_direction, exec_reverse)) | |
9134 | execution_direction = EXEC_REVERSE; | |
9135 | } | |
8bbed405 MS |
9136 | else |
9137 | { | |
9138 | exec_direction = exec_forward; | |
9139 | error (_("Target does not support this operation.")); | |
9140 | } | |
b2175913 MS |
9141 | } |
9142 | ||
9143 | static void | |
9144 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9145 | struct cmd_list_element *cmd, const char *value) | |
9146 | { | |
9147 | switch (execution_direction) { | |
9148 | case EXEC_FORWARD: | |
9149 | fprintf_filtered (out, _("Forward.\n")); | |
9150 | break; | |
9151 | case EXEC_REVERSE: | |
9152 | fprintf_filtered (out, _("Reverse.\n")); | |
9153 | break; | |
b2175913 | 9154 | default: |
d8b34453 PA |
9155 | internal_error (__FILE__, __LINE__, |
9156 | _("bogus execution_direction value: %d"), | |
9157 | (int) execution_direction); | |
b2175913 MS |
9158 | } |
9159 | } | |
9160 | ||
d4db2f36 PA |
9161 | static void |
9162 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9163 | struct cmd_list_element *c, const char *value) | |
9164 | { | |
3e43a32a MS |
9165 | fprintf_filtered (file, _("Resuming the execution of threads " |
9166 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9167 | } |
ad52ddc6 | 9168 | |
22d2b532 SDJ |
9169 | /* Implementation of `siginfo' variable. */ |
9170 | ||
9171 | static const struct internalvar_funcs siginfo_funcs = | |
9172 | { | |
9173 | siginfo_make_value, | |
9174 | NULL, | |
9175 | NULL | |
9176 | }; | |
9177 | ||
372316f1 PA |
9178 | /* Callback for infrun's target events source. This is marked when a |
9179 | thread has a pending status to process. */ | |
9180 | ||
9181 | static void | |
9182 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9183 | { | |
b1a35af2 | 9184 | inferior_event_handler (INF_REG_EVENT); |
372316f1 PA |
9185 | } |
9186 | ||
8087c3fa | 9187 | #if GDB_SELF_TEST |
b161a60d SM |
9188 | namespace selftests |
9189 | { | |
9190 | ||
9191 | /* Verify that when two threads with the same ptid exist (from two different | |
9192 | targets) and one of them changes ptid, we only update inferior_ptid if | |
9193 | it is appropriate. */ | |
9194 | ||
9195 | static void | |
9196 | infrun_thread_ptid_changed () | |
9197 | { | |
9198 | gdbarch *arch = current_inferior ()->gdbarch; | |
9199 | ||
9200 | /* The thread which inferior_ptid represents changes ptid. */ | |
9201 | { | |
9202 | scoped_restore_current_pspace_and_thread restore; | |
9203 | ||
9204 | scoped_mock_context<test_target_ops> target1 (arch); | |
9205 | scoped_mock_context<test_target_ops> target2 (arch); | |
9206 | target2.mock_inferior.next = &target1.mock_inferior; | |
9207 | ||
9208 | ptid_t old_ptid (111, 222); | |
9209 | ptid_t new_ptid (111, 333); | |
9210 | ||
9211 | target1.mock_inferior.pid = old_ptid.pid (); | |
9212 | target1.mock_thread.ptid = old_ptid; | |
9213 | target2.mock_inferior.pid = old_ptid.pid (); | |
9214 | target2.mock_thread.ptid = old_ptid; | |
9215 | ||
9216 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
9217 | set_current_inferior (&target1.mock_inferior); | |
9218 | ||
9219 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9220 | ||
9221 | gdb_assert (inferior_ptid == new_ptid); | |
9222 | } | |
9223 | ||
9224 | /* A thread with the same ptid as inferior_ptid, but from another target, | |
9225 | changes ptid. */ | |
9226 | { | |
9227 | scoped_restore_current_pspace_and_thread restore; | |
9228 | ||
9229 | scoped_mock_context<test_target_ops> target1 (arch); | |
9230 | scoped_mock_context<test_target_ops> target2 (arch); | |
9231 | target2.mock_inferior.next = &target1.mock_inferior; | |
9232 | ||
9233 | ptid_t old_ptid (111, 222); | |
9234 | ptid_t new_ptid (111, 333); | |
9235 | ||
9236 | target1.mock_inferior.pid = old_ptid.pid (); | |
9237 | target1.mock_thread.ptid = old_ptid; | |
9238 | target2.mock_inferior.pid = old_ptid.pid (); | |
9239 | target2.mock_thread.ptid = old_ptid; | |
9240 | ||
9241 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
9242 | set_current_inferior (&target2.mock_inferior); | |
9243 | ||
9244 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9245 | ||
9246 | gdb_assert (inferior_ptid == old_ptid); | |
9247 | } | |
9248 | } | |
9249 | ||
9250 | } /* namespace selftests */ | |
9251 | ||
8087c3fa JB |
9252 | #endif /* GDB_SELF_TEST */ |
9253 | ||
6c265988 | 9254 | void _initialize_infrun (); |
c906108c | 9255 | void |
6c265988 | 9256 | _initialize_infrun () |
c906108c | 9257 | { |
de0bea00 | 9258 | struct cmd_list_element *c; |
c906108c | 9259 | |
372316f1 PA |
9260 | /* Register extra event sources in the event loop. */ |
9261 | infrun_async_inferior_event_token | |
db20ebdf SM |
9262 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL, |
9263 | "infrun"); | |
372316f1 | 9264 | |
11db9430 | 9265 | add_info ("signals", info_signals_command, _("\ |
1bedd215 AC |
9266 | What debugger does when program gets various signals.\n\ |
9267 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9268 | add_info_alias ("handle", "signals", 0); |
9269 | ||
de0bea00 | 9270 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9271 | Specify how to handle signals.\n\ |
486c7739 | 9272 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9273 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9274 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9275 | will be displayed instead.\n\ |
9276 | \n\ | |
c906108c SS |
9277 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9278 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9279 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9280 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9281 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9282 | \n\ |
1bedd215 | 9283 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9284 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9285 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9286 | Print means print a message if this signal happens.\n\ | |
9287 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9288 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9289 | Pass and Stop may be combined.\n\ |
9290 | \n\ | |
9291 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9292 | may be interspersed with actions, with the actions being performed for\n\ | |
9293 | all signals cumulatively specified.")); | |
de0bea00 | 9294 | set_cmd_completer (c, handle_completer); |
486c7739 | 9295 | |
c906108c | 9296 | if (!dbx_commands) |
1a966eab AC |
9297 | stop_command = add_cmd ("stop", class_obscure, |
9298 | not_just_help_class_command, _("\ | |
9299 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9300 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9301 | of the program stops."), &cmdlist); |
c906108c | 9302 | |
ccce17b0 | 9303 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9304 | Set inferior debugging."), _("\ |
9305 | Show inferior debugging."), _("\ | |
9306 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9307 | NULL, |
9308 | show_debug_infrun, | |
9309 | &setdebuglist, &showdebuglist); | |
527159b7 | 9310 | |
3e43a32a MS |
9311 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9312 | &debug_displaced, _("\ | |
237fc4c9 PA |
9313 | Set displaced stepping debugging."), _("\ |
9314 | Show displaced stepping debugging."), _("\ | |
9315 | When non-zero, displaced stepping specific debugging is enabled."), | |
9316 | NULL, | |
9317 | show_debug_displaced, | |
9318 | &setdebuglist, &showdebuglist); | |
9319 | ||
ad52ddc6 PA |
9320 | add_setshow_boolean_cmd ("non-stop", no_class, |
9321 | &non_stop_1, _("\ | |
9322 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9323 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9324 | When debugging a multi-threaded program and this setting is\n\ | |
9325 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9326 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9327 | all other threads in the program while you interact with the thread of\n\ | |
9328 | interest. When you continue or step a thread, you can allow the other\n\ | |
9329 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9330 | thread's state, all threads stop.\n\ | |
9331 | \n\ | |
9332 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9333 | to run freely. You'll be able to step each thread independently,\n\ | |
9334 | leave it stopped or free to run as needed."), | |
9335 | set_non_stop, | |
9336 | show_non_stop, | |
9337 | &setlist, | |
9338 | &showlist); | |
9339 | ||
adc6a863 | 9340 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9341 | { |
9342 | signal_stop[i] = 1; | |
9343 | signal_print[i] = 1; | |
9344 | signal_program[i] = 1; | |
ab04a2af | 9345 | signal_catch[i] = 0; |
c906108c SS |
9346 | } |
9347 | ||
4d9d9d04 PA |
9348 | /* Signals caused by debugger's own actions should not be given to |
9349 | the program afterwards. | |
9350 | ||
9351 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9352 | explicitly specifies that it should be delivered to the target | |
9353 | program. Typically, that would occur when a user is debugging a | |
9354 | target monitor on a simulator: the target monitor sets a | |
9355 | breakpoint; the simulator encounters this breakpoint and halts | |
9356 | the simulation handing control to GDB; GDB, noting that the stop | |
9357 | address doesn't map to any known breakpoint, returns control back | |
9358 | to the simulator; the simulator then delivers the hardware | |
9359 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9360 | debugged. */ | |
a493e3e2 PA |
9361 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9362 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9363 | |
9364 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9365 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9366 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9367 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9368 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9369 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9370 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9371 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9372 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9373 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9374 | signal_print[GDB_SIGNAL_IO] = 0; | |
9375 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9376 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9377 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9378 | signal_print[GDB_SIGNAL_URG] = 0; | |
9379 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9380 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9381 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9382 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9383 | |
cd0fc7c3 SS |
9384 | /* These signals are used internally by user-level thread |
9385 | implementations. (See signal(5) on Solaris.) Like the above | |
9386 | signals, a healthy program receives and handles them as part of | |
9387 | its normal operation. */ | |
a493e3e2 PA |
9388 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9389 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9390 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9391 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9392 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9393 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9394 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9395 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9396 | |
2455069d UW |
9397 | /* Update cached state. */ |
9398 | signal_cache_update (-1); | |
9399 | ||
85c07804 AC |
9400 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9401 | &stop_on_solib_events, _("\ | |
9402 | Set stopping for shared library events."), _("\ | |
9403 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9404 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9405 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9406 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9407 | set_stop_on_solib_events, |
920d2a44 | 9408 | show_stop_on_solib_events, |
85c07804 | 9409 | &setlist, &showlist); |
c906108c | 9410 | |
7ab04401 AC |
9411 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9412 | follow_fork_mode_kind_names, | |
9413 | &follow_fork_mode_string, _("\ | |
9414 | Set debugger response to a program call of fork or vfork."), _("\ | |
9415 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9416 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9417 | parent - the original process is debugged after a fork\n\ | |
9418 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9419 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9420 | By default, the debugger will follow the parent process."), |
9421 | NULL, | |
920d2a44 | 9422 | show_follow_fork_mode_string, |
7ab04401 AC |
9423 | &setlist, &showlist); |
9424 | ||
6c95b8df PA |
9425 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9426 | follow_exec_mode_names, | |
9427 | &follow_exec_mode_string, _("\ | |
9428 | Set debugger response to a program call of exec."), _("\ | |
9429 | Show debugger response to a program call of exec."), _("\ | |
9430 | An exec call replaces the program image of a process.\n\ | |
9431 | \n\ | |
9432 | follow-exec-mode can be:\n\ | |
9433 | \n\ | |
cce7e648 | 9434 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9435 | to this new inferior. The program the process was running before\n\ |
9436 | the exec call can be restarted afterwards by restarting the original\n\ | |
9437 | inferior.\n\ | |
9438 | \n\ | |
9439 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9440 | The new executable image replaces the previous executable loaded in\n\ | |
9441 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9442 | the executable the process was running after the exec call.\n\ | |
9443 | \n\ | |
9444 | By default, the debugger will use the same inferior."), | |
9445 | NULL, | |
9446 | show_follow_exec_mode_string, | |
9447 | &setlist, &showlist); | |
9448 | ||
7ab04401 AC |
9449 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9450 | scheduler_enums, &scheduler_mode, _("\ | |
9451 | Set mode for locking scheduler during execution."), _("\ | |
9452 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9453 | off == no locking (threads may preempt at any time)\n\ |
9454 | on == full locking (no thread except the current thread may run)\n\ | |
9455 | This applies to both normal execution and replay mode.\n\ | |
9456 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9457 | In this mode, other threads may run during other commands.\n\ | |
9458 | This applies to both normal execution and replay mode.\n\ | |
9459 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9460 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9461 | show_scheduler_mode, |
7ab04401 | 9462 | &setlist, &showlist); |
5fbbeb29 | 9463 | |
d4db2f36 PA |
9464 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9465 | Set mode for resuming threads of all processes."), _("\ | |
9466 | Show mode for resuming threads of all processes."), _("\ | |
9467 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9468 | threads of all processes. When off (which is the default), execution\n\ | |
9469 | commands only resume the threads of the current process. The set of\n\ | |
9470 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9471 | mode (see help set scheduler-locking)."), | |
9472 | NULL, | |
9473 | show_schedule_multiple, | |
9474 | &setlist, &showlist); | |
9475 | ||
5bf193a2 AC |
9476 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9477 | Set mode of the step operation."), _("\ | |
9478 | Show mode of the step operation."), _("\ | |
9479 | When set, doing a step over a function without debug line information\n\ | |
9480 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9481 | function is skipped and the step command stops at a different source line."), | |
9482 | NULL, | |
920d2a44 | 9483 | show_step_stop_if_no_debug, |
5bf193a2 | 9484 | &setlist, &showlist); |
ca6724c1 | 9485 | |
72d0e2c5 YQ |
9486 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9487 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9488 | Set debugger's willingness to use displaced stepping."), _("\ |
9489 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9490 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9491 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9492 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9493 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9494 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9495 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9496 | NULL, |
9497 | show_can_use_displaced_stepping, | |
9498 | &setlist, &showlist); | |
237fc4c9 | 9499 | |
b2175913 MS |
9500 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9501 | &exec_direction, _("Set direction of execution.\n\ | |
9502 | Options are 'forward' or 'reverse'."), | |
9503 | _("Show direction of execution (forward/reverse)."), | |
9504 | _("Tells gdb whether to execute forward or backward."), | |
9505 | set_exec_direction_func, show_exec_direction_func, | |
9506 | &setlist, &showlist); | |
9507 | ||
6c95b8df PA |
9508 | /* Set/show detach-on-fork: user-settable mode. */ |
9509 | ||
9510 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9511 | Set whether gdb will detach the child of a fork."), _("\ | |
9512 | Show whether gdb will detach the child of a fork."), _("\ | |
9513 | Tells gdb whether to detach the child of a fork."), | |
9514 | NULL, NULL, &setlist, &showlist); | |
9515 | ||
03583c20 UW |
9516 | /* Set/show disable address space randomization mode. */ |
9517 | ||
9518 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9519 | &disable_randomization, _("\ | |
9520 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9521 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9522 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9523 | address space is disabled. Standalone programs run with the randomization\n\ | |
9524 | enabled by default on some platforms."), | |
9525 | &set_disable_randomization, | |
9526 | &show_disable_randomization, | |
9527 | &setlist, &showlist); | |
9528 | ||
ca6724c1 | 9529 | /* ptid initializations */ |
ca6724c1 KB |
9530 | inferior_ptid = null_ptid; |
9531 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9532 | |
76727919 TT |
9533 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed); |
9534 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested); | |
9535 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit); | |
9536 | gdb::observers::inferior_exit.attach (infrun_inferior_exit); | |
4aa995e1 PA |
9537 | |
9538 | /* Explicitly create without lookup, since that tries to create a | |
9539 | value with a void typed value, and when we get here, gdbarch | |
9540 | isn't initialized yet. At this point, we're quite sure there | |
9541 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9542 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9543 | |
9544 | add_setshow_boolean_cmd ("observer", no_class, | |
9545 | &observer_mode_1, _("\ | |
9546 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9547 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9548 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9549 | affect its execution. Registers and memory may not be changed,\n\ | |
9550 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9551 | or signalled."), | |
9552 | set_observer_mode, | |
9553 | show_observer_mode, | |
9554 | &setlist, | |
9555 | &showlist); | |
b161a60d SM |
9556 | |
9557 | #if GDB_SELF_TEST | |
9558 | selftests::register_test ("infrun_thread_ptid_changed", | |
9559 | selftests::infrun_thread_ptid_changed); | |
9560 | #endif | |
c906108c | 9561 | } |